1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
46 #include "c-family/c-common.h"
47 #include "c-family/c-objc.h"
48 #include "c-family/c-pragma.h"
49 #include "diagnostic.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR, /* variable */
60 BSP_PARM, /* parameter */
65 static tree grokparms (tree parmlist, tree *);
66 static const char *redeclaration_error_message (tree, tree);
68 static int decl_jump_unsafe (tree);
69 static void require_complete_types_for_parms (tree);
70 static int ambi_op_p (enum tree_code);
71 static int unary_op_p (enum tree_code);
72 static void push_local_name (tree);
73 static tree grok_reference_init (tree, tree, tree, int);
74 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
76 static int check_static_variable_definition (tree, tree);
77 static void record_unknown_type (tree, const char *);
78 static tree builtin_function_1 (tree, tree, bool);
79 static tree build_library_fn_1 (tree, enum tree_code, tree);
80 static int member_function_or_else (tree, tree, enum overload_flags);
81 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
83 static void check_for_uninitialized_const_var (tree);
84 static hashval_t typename_hash (const void *);
85 static int typename_compare (const void *, const void *);
86 static tree local_variable_p_walkfn (tree *, int *, void *);
87 static tree record_builtin_java_type (const char *, int);
88 static const char *tag_name (enum tag_types);
89 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
90 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
91 static void maybe_deduce_size_from_array_init (tree, tree);
92 static void layout_var_decl (tree);
93 static tree check_initializer (tree, tree, int, VEC(tree,gc) **);
94 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
95 static void save_function_data (tree);
96 static void copy_type_enum (tree , tree);
97 static void check_function_type (tree, tree);
98 static void finish_constructor_body (void);
99 static void begin_destructor_body (void);
100 static void finish_destructor_body (void);
101 static void record_key_method_defined (tree);
102 static tree create_array_type_for_decl (tree, tree, tree);
103 static tree get_atexit_node (void);
104 static tree get_dso_handle_node (void);
105 static tree start_cleanup_fn (void);
106 static void end_cleanup_fn (void);
107 static tree cp_make_fname_decl (location_t, tree, int);
108 static void initialize_predefined_identifiers (void);
109 static tree check_special_function_return_type
110 (special_function_kind, tree, tree);
111 static tree push_cp_library_fn (enum tree_code, tree);
112 static tree build_cp_library_fn (tree, enum tree_code, tree);
113 static void store_parm_decls (tree);
114 static void initialize_local_var (tree, tree);
115 static void expand_static_init (tree, tree);
117 /* The following symbols are subsumed in the cp_global_trees array, and
118 listed here individually for documentation purposes.
121 tree wchar_decl_node;
123 tree vtable_entry_type;
124 tree delta_type_node;
125 tree __t_desc_type_node;
127 tree class_type_node;
128 tree unknown_type_node;
130 Array type `vtable_entry_type[]'
133 tree vtbl_ptr_type_node;
140 A FUNCTION_DECL which can call `abort'. Not necessarily the
141 one that the user will declare, but sufficient to be called
142 by routines that want to abort the program.
146 The FUNCTION_DECL for the default `::operator delete'.
148 tree global_delete_fndecl;
151 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
152 tree tinfo_var_id; */
154 tree cp_global_trees[CPTI_MAX];
156 /* Indicates that there is a type value in some namespace, although
157 that is not necessarily in scope at the moment. */
159 tree global_type_node;
161 /* The node that holds the "name" of the global scope. */
162 tree global_scope_name;
164 #define local_names cp_function_chain->x_local_names
166 /* A list of objects which have constructors or destructors
167 which reside in the global scope. The decl is stored in
168 the TREE_VALUE slot and the initializer is stored
169 in the TREE_PURPOSE slot. */
170 tree static_aggregates;
174 /* A node for the integer constant 2. */
176 tree integer_two_node;
178 /* Used only for jumps to as-yet undefined labels, since jumps to
179 defined labels can have their validity checked immediately. */
181 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
182 struct named_label_use_entry *next;
183 /* The binding level to which this entry is *currently* attached.
184 This is initially the binding level in which the goto appeared,
185 but is modified as scopes are closed. */
186 cp_binding_level *binding_level;
187 /* The head of the names list that was current when the goto appeared,
188 or the inner scope popped. These are the decls that will *not* be
189 skipped when jumping to the label. */
191 /* The location of the goto, for error reporting. */
192 location_t o_goto_locus;
193 /* True if an OpenMP structured block scope has been closed since
194 the goto appeared. This means that the branch from the label will
195 illegally exit an OpenMP scope. */
199 /* A list of all LABEL_DECLs in the function that have names. Here so
200 we can clear out their names' definitions at the end of the
201 function, and so we can check the validity of jumps to these labels. */
203 struct GTY(()) named_label_entry {
204 /* The decl itself. */
207 /* The binding level to which the label is *currently* attached.
208 This is initially set to the binding level in which the label
209 is defined, but is modified as scopes are closed. */
210 cp_binding_level *binding_level;
211 /* The head of the names list that was current when the label was
212 defined, or the inner scope popped. These are the decls that will
213 be skipped when jumping to the label. */
215 /* A vector of all decls from all binding levels that would be
216 crossed by a backward branch to the label. */
217 VEC(tree,gc) *bad_decls;
219 /* A list of uses of the label, before the label is defined. */
220 struct named_label_use_entry *uses;
222 /* The following bits are set after the label is defined, and are
223 updated as scopes are popped. They indicate that a backward jump
224 to the label will illegally enter a scope of the given flavor. */
230 #define named_labels cp_function_chain->x_named_labels
232 /* The number of function bodies which we are currently processing.
233 (Zero if we are at namespace scope, one inside the body of a
234 function, two inside the body of a function in a local class, etc.) */
237 /* To avoid unwanted recursion, finish_function defers all mark_used calls
238 encountered during its execution until it finishes. */
239 bool defer_mark_used_calls;
240 VEC(tree, gc) *deferred_mark_used_calls;
242 /* States indicating how grokdeclarator() should handle declspecs marked
243 with __attribute__((deprecated)). An object declared as
244 __attribute__((deprecated)) suppresses warnings of uses of other
246 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
249 /* A list of VAR_DECLs whose type was incomplete at the time the
250 variable was declared. */
252 typedef struct GTY(()) incomplete_var_d {
254 tree incomplete_type;
257 DEF_VEC_O(incomplete_var);
258 DEF_VEC_ALLOC_O(incomplete_var,gc);
260 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
262 /* Returns the kind of template specialization we are currently
263 processing, given that it's declaration contained N_CLASS_SCOPES
264 explicit scope qualifications. */
267 current_tmpl_spec_kind (int n_class_scopes)
269 int n_template_parm_scopes = 0;
270 int seen_specialization_p = 0;
271 int innermost_specialization_p = 0;
274 /* Scan through the template parameter scopes. */
275 for (b = current_binding_level;
276 b->kind == sk_template_parms;
279 /* If we see a specialization scope inside a parameter scope,
280 then something is wrong. That corresponds to a declaration
283 template <class T> template <> ...
285 which is always invalid since [temp.expl.spec] forbids the
286 specialization of a class member template if the enclosing
287 class templates are not explicitly specialized as well. */
288 if (b->explicit_spec_p)
290 if (n_template_parm_scopes == 0)
291 innermost_specialization_p = 1;
293 seen_specialization_p = 1;
295 else if (seen_specialization_p == 1)
296 return tsk_invalid_member_spec;
298 ++n_template_parm_scopes;
301 /* Handle explicit instantiations. */
302 if (processing_explicit_instantiation)
304 if (n_template_parm_scopes != 0)
305 /* We've seen a template parameter list during an explicit
306 instantiation. For example:
308 template <class T> template void f(int);
310 This is erroneous. */
311 return tsk_invalid_expl_inst;
313 return tsk_expl_inst;
316 if (n_template_parm_scopes < n_class_scopes)
317 /* We've not seen enough template headers to match all the
318 specialized classes present. For example:
320 template <class T> void R<T>::S<T>::f(int);
322 This is invalid; there needs to be one set of template
323 parameters for each class. */
324 return tsk_insufficient_parms;
325 else if (n_template_parm_scopes == n_class_scopes)
326 /* We're processing a non-template declaration (even though it may
327 be a member of a template class.) For example:
329 template <class T> void S<T>::f(int);
331 The `class T' matches the `S<T>', leaving no template headers
332 corresponding to the `f'. */
334 else if (n_template_parm_scopes > n_class_scopes + 1)
335 /* We've got too many template headers. For example:
337 template <> template <class T> void f (T);
339 There need to be more enclosing classes. */
340 return tsk_excessive_parms;
342 /* This must be a template. It's of the form:
344 template <class T> template <class U> void S<T>::f(U);
346 This is a specialization if the innermost level was a
347 specialization; otherwise it's just a definition of the
349 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
352 /* Exit the current scope. */
360 /* When a label goes out of scope, check to see if that label was used
361 in a valid manner, and issue any appropriate warnings or errors. */
364 pop_label (tree label, tree old_value)
366 if (!processing_template_decl)
368 if (DECL_INITIAL (label) == NULL_TREE)
372 error ("label %q+D used but not defined", label);
373 location = input_location; /* FIXME want (input_filename, (line)0) */
374 /* Avoid crashing later. */
375 define_label (location, DECL_NAME (label));
378 warn_for_unused_label (label);
381 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
384 /* At the end of a function, all labels declared within the function
385 go out of scope. BLOCK is the top-level block for the
389 pop_labels_1 (void **slot, void *data)
391 struct named_label_entry *ent = (struct named_label_entry *) *slot;
392 tree block = (tree) data;
394 pop_label (ent->label_decl, NULL_TREE);
396 /* Put the labels into the "variables" of the top-level block,
397 so debugger can see them. */
398 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
399 BLOCK_VARS (block) = ent->label_decl;
401 htab_clear_slot (named_labels, slot);
407 pop_labels (tree block)
411 htab_traverse (named_labels, pop_labels_1, block);
416 /* At the end of a block with local labels, restore the outer definition. */
419 pop_local_label (tree label, tree old_value)
421 struct named_label_entry dummy;
424 pop_label (label, old_value);
426 dummy.label_decl = label;
427 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
428 htab_clear_slot (named_labels, slot);
431 /* The following two routines are used to interface to Objective-C++.
432 The binding level is purposely treated as an opaque type. */
435 objc_get_current_scope (void)
437 return current_binding_level;
440 /* The following routine is used by the NeXT-style SJLJ exceptions;
441 variables get marked 'volatile' so as to not be clobbered by
442 _setjmp()/_longjmp() calls. All variables in the current scope,
443 as well as parent scopes up to (but not including) ENCLOSING_BLK
444 shall be thusly marked. */
447 objc_mark_locals_volatile (void *enclosing_blk)
449 cp_binding_level *scope;
451 for (scope = current_binding_level;
452 scope && scope != enclosing_blk;
453 scope = scope->level_chain)
457 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
458 objc_volatilize_decl (decl);
460 /* Do not climb up past the current function. */
461 if (scope->kind == sk_function_parms)
466 /* Update data for defined and undefined labels when leaving a scope. */
469 poplevel_named_label_1 (void **slot, void *data)
471 struct named_label_entry *ent = (struct named_label_entry *) *slot;
472 cp_binding_level *bl = (cp_binding_level *) data;
473 cp_binding_level *obl = bl->level_chain;
475 if (ent->binding_level == bl)
479 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
480 TREE_LISTs representing OVERLOADs, so be careful. */
481 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
483 : TREE_CHAIN (decl)))
484 if (decl_jump_unsafe (decl))
485 VEC_safe_push (tree, gc, ent->bad_decls, decl);
487 ent->binding_level = obl;
488 ent->names_in_scope = obl->names;
492 ent->in_try_scope = true;
495 ent->in_catch_scope = true;
498 ent->in_omp_scope = true;
506 struct named_label_use_entry *use;
508 for (use = ent->uses; use ; use = use->next)
509 if (use->binding_level == bl)
511 use->binding_level = obl;
512 use->names_in_scope = obl->names;
513 if (bl->kind == sk_omp)
514 use->in_omp_scope = true;
521 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
522 when errors were reported, except for -Werror-unused-but-set-*. */
523 static int unused_but_set_errorcount;
525 /* Exit a binding level.
526 Pop the level off, and restore the state of the identifier-decl mappings
527 that were in effect when this level was entered.
529 If KEEP == 1, this level had explicit declarations, so
530 and create a "block" (a BLOCK node) for the level
531 to record its declarations and subblocks for symbol table output.
533 If FUNCTIONBODY is nonzero, this level is the body of a function,
534 so create a block as if KEEP were set and also clear out all
537 If REVERSE is nonzero, reverse the order of decls before putting
538 them into the BLOCK. */
541 poplevel (int keep, int reverse, int functionbody)
544 /* The chain of decls was accumulated in reverse order.
545 Put it into forward order, just for cleanliness. */
550 int leaving_for_scope;
553 cp_label_binding *label_bind;
555 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
560 gcc_assert (current_binding_level->kind != sk_class);
562 if (current_binding_level->kind == sk_cleanup)
564 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
566 gcc_assert (!VEC_length(cp_class_binding,
567 current_binding_level->class_shadowed));
569 /* We used to use KEEP == 2 to indicate that the new block should go
570 at the beginning of the list of blocks at this binding level,
571 rather than the end. This hack is no longer used. */
572 gcc_assert (keep == 0 || keep == 1);
574 if (current_binding_level->keep)
577 /* Any uses of undefined labels, and any defined labels, now operate
578 under constraints of next binding contour. */
579 if (cfun && !functionbody && named_labels)
580 htab_traverse (named_labels, poplevel_named_label_1,
581 current_binding_level);
583 /* Get the decls in the order they were written.
584 Usually current_binding_level->names is in reverse order.
585 But parameter decls were previously put in forward order. */
588 current_binding_level->names
589 = decls = nreverse (current_binding_level->names);
591 decls = current_binding_level->names;
593 /* If there were any declarations or structure tags in that level,
594 or if this level is a function body,
595 create a BLOCK to record them for the life of this function. */
597 if (keep == 1 || functionbody)
598 block = make_node (BLOCK);
599 if (block != NULL_TREE)
601 BLOCK_VARS (block) = decls;
602 BLOCK_SUBBLOCKS (block) = subblocks;
605 /* In each subblock, record that this is its superior. */
607 for (link = subblocks; link; link = BLOCK_CHAIN (link))
608 BLOCK_SUPERCONTEXT (link) = block;
610 /* We still support the old for-scope rules, whereby the variables
611 in a for-init statement were in scope after the for-statement
612 ended. We only use the new rules if flag_new_for_scope is
615 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
617 /* Before we remove the declarations first check for unused variables. */
618 if ((warn_unused_variable || warn_unused_but_set_variable)
619 && !processing_template_decl)
620 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
621 if (TREE_CODE (decl) == VAR_DECL
622 && (! TREE_USED (decl) || !DECL_READ_P (decl))
623 && ! DECL_IN_SYSTEM_HEADER (decl)
624 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)
625 && TREE_TYPE (decl) != error_mark_node
626 && (!CLASS_TYPE_P (TREE_TYPE (decl))
627 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
629 if (! TREE_USED (decl))
630 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
631 else if (DECL_CONTEXT (decl) == current_function_decl
632 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
633 && errorcount == unused_but_set_errorcount)
635 warning (OPT_Wunused_but_set_variable,
636 "variable %q+D set but not used", decl);
637 unused_but_set_errorcount = errorcount;
641 /* Remove declarations for all the DECLs in this level. */
642 for (link = decls; link; link = TREE_CHAIN (link))
644 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
645 /* It's hard to make this ARM compatibility hack play nicely with
646 lambdas, and it really isn't necessary in C++11 mode. */
647 && cxx_dialect < cxx0x
650 tree name = DECL_NAME (link);
654 ob = outer_binding (name,
655 IDENTIFIER_BINDING (name),
658 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
660 ns_binding = NULL_TREE;
662 if (ob && ob->scope == current_binding_level->level_chain)
663 /* We have something like:
668 and we are leaving the `for' scope. There's no reason to
669 keep the binding of the inner `i' in this case. */
670 pop_binding (name, link);
671 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
672 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
673 /* Here, we have something like:
681 We must pop the for-scope binding so we know what's a
682 type and what isn't. */
683 pop_binding (name, link);
686 /* Mark this VAR_DECL as dead so that we can tell we left it
687 there only for backward compatibility. */
688 DECL_DEAD_FOR_LOCAL (link) = 1;
690 /* Keep track of what should have happened when we
691 popped the binding. */
694 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
695 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
698 /* Add it to the list of dead variables in the next
699 outermost binding to that we can remove these when we
700 leave that binding. */
701 VEC_safe_push (tree, gc,
702 current_binding_level->level_chain->dead_vars_from_for,
705 /* Although we don't pop the cxx_binding, we do clear
706 its SCOPE since the scope is going away now. */
707 IDENTIFIER_BINDING (name)->scope
708 = current_binding_level->level_chain;
715 /* Remove the binding. */
718 if (TREE_CODE (decl) == TREE_LIST)
719 decl = TREE_VALUE (decl);
722 if (TREE_CODE (name) == OVERLOAD)
723 name = OVL_FUNCTION (name);
725 gcc_assert (DECL_P (name));
726 pop_binding (DECL_NAME (name), decl);
730 /* Remove declarations for any `for' variables from inner scopes
731 that we kept around. */
732 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
734 pop_binding (DECL_NAME (decl), decl);
736 /* Restore the IDENTIFIER_TYPE_VALUEs. */
737 for (link = current_binding_level->type_shadowed;
738 link; link = TREE_CHAIN (link))
739 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
741 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
742 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
743 current_binding_level->shadowed_labels,
745 pop_local_label (label_bind->label, label_bind->prev_value);
747 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
748 list if a `using' declaration put them there. The debugging
749 back ends won't understand OVERLOAD, so we remove them here.
750 Because the BLOCK_VARS are (temporarily) shared with
751 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
752 popped all the bindings. */
757 for (d = &BLOCK_VARS (block); *d; )
759 if (TREE_CODE (*d) == TREE_LIST)
760 *d = TREE_CHAIN (*d);
762 d = &DECL_CHAIN (*d);
766 /* If the level being exited is the top level of a function,
767 check over all the labels. */
770 /* Since this is the top level block of a function, the vars are
771 the function's parameters. Don't leave them in the BLOCK
772 because they are found in the FUNCTION_DECL instead. */
773 BLOCK_VARS (block) = 0;
777 kind = current_binding_level->kind;
778 if (kind == sk_cleanup)
782 /* If this is a temporary binding created for a cleanup, then we'll
783 have pushed a statement list level. Pop that, create a new
784 BIND_EXPR for the block, and insert it into the stream. */
785 stmt = pop_stmt_list (current_binding_level->statement_list);
786 stmt = c_build_bind_expr (input_location, block, stmt);
793 /* The current function is being defined, so its DECL_INITIAL
794 should be error_mark_node. */
795 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
796 DECL_INITIAL (current_function_decl) = block;
799 current_binding_level->blocks
800 = block_chainon (current_binding_level->blocks, block);
802 /* If we did not make a block for the level just exited,
803 any blocks made for inner levels
804 (since they cannot be recorded as subblocks in that level)
805 must be carried forward so they will later become subblocks
806 of something else. */
808 current_binding_level->blocks
809 = block_chainon (current_binding_level->blocks, subblocks);
811 /* Each and every BLOCK node created here in `poplevel' is important
812 (e.g. for proper debugging information) so if we created one
813 earlier, mark it as "used". */
815 TREE_USED (block) = 1;
817 /* All temporary bindings created for cleanups are popped silently. */
818 if (kind == sk_cleanup)
821 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
825 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
826 itself, calling F for each. The DATA is passed to F as well. */
829 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
832 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
834 result |= (*f) (name_space, data);
836 for (; current; current = DECL_CHAIN (current))
837 result |= walk_namespaces_r (current, f, data);
842 /* Walk all the namespaces, calling F for each. The DATA is passed to
846 walk_namespaces (walk_namespaces_fn f, void* data)
848 return walk_namespaces_r (global_namespace, f, data);
851 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
852 DATA is non-NULL, this is the last time we will call
853 wrapup_global_declarations for this NAMESPACE. */
856 wrapup_globals_for_namespace (tree name_space, void* data)
858 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
859 VEC(tree,gc) *statics = level->static_decls;
860 tree *vec = VEC_address (tree, statics);
861 int len = VEC_length (tree, statics);
862 int last_time = (data != 0);
866 check_global_declarations (vec, len);
867 emit_debug_global_declarations (vec, len);
871 /* Write out any globals that need to be output. */
872 return wrapup_global_declarations (vec, len);
876 /* In C++, you don't have to write `struct S' to refer to `S'; you
877 can just use `S'. We accomplish this by creating a TYPE_DECL as
878 if the user had written `typedef struct S S'. Create and return
879 the TYPE_DECL for TYPE. */
882 create_implicit_typedef (tree name, tree type)
886 decl = build_decl (input_location, TYPE_DECL, name, type);
887 DECL_ARTIFICIAL (decl) = 1;
888 /* There are other implicit type declarations, like the one *within*
889 a class that allows you to write `S::S'. We must distinguish
891 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
892 TYPE_NAME (type) = decl;
893 TYPE_STUB_DECL (type) = decl;
898 /* Remember a local name for name-mangling purposes. */
901 push_local_name (tree decl)
906 timevar_start (TV_NAME_LOOKUP);
908 name = DECL_NAME (decl);
910 nelts = VEC_length (tree, local_names);
911 for (i = 0; i < nelts; i++)
913 t = VEC_index (tree, local_names, i);
914 if (DECL_NAME (t) == name)
916 if (!DECL_LANG_SPECIFIC (decl))
917 retrofit_lang_decl (decl);
918 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
919 if (DECL_LANG_SPECIFIC (t))
920 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
922 DECL_DISCRIMINATOR (decl) = 1;
924 VEC_replace (tree, local_names, i, decl);
925 timevar_stop (TV_NAME_LOOKUP);
930 VEC_safe_push (tree, gc, local_names, decl);
931 timevar_stop (TV_NAME_LOOKUP);
934 /* Subroutine of duplicate_decls: return truthvalue of whether
935 or not types of these decls match.
937 For C++, we must compare the parameter list so that `int' can match
938 `int&' in a parameter position, but `int&' is not confused with
942 decls_match (tree newdecl, tree olddecl)
946 if (newdecl == olddecl)
949 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
950 /* If the two DECLs are not even the same kind of thing, we're not
951 interested in their types. */
954 gcc_assert (DECL_P (newdecl));
956 if (TREE_CODE (newdecl) == FUNCTION_DECL)
958 tree f1 = TREE_TYPE (newdecl);
959 tree f2 = TREE_TYPE (olddecl);
960 tree p1 = TYPE_ARG_TYPES (f1);
961 tree p2 = TYPE_ARG_TYPES (f2);
964 /* Specializations of different templates are different functions
965 even if they have the same type. */
966 tree t1 = (DECL_USE_TEMPLATE (newdecl)
967 ? DECL_TI_TEMPLATE (newdecl)
969 tree t2 = (DECL_USE_TEMPLATE (olddecl)
970 ? DECL_TI_TEMPLATE (olddecl)
975 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
976 && ! (DECL_EXTERN_C_P (newdecl)
977 && DECL_EXTERN_C_P (olddecl)))
980 #ifdef NO_IMPLICIT_EXTERN_C
981 /* A new declaration doesn't match a built-in one unless it
982 is also extern "C". */
983 if (DECL_IS_BUILTIN (olddecl)
984 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
988 if (TREE_CODE (f1) != TREE_CODE (f2))
991 /* A declaration with deduced return type should use its pre-deduction
992 type for declaration matching. */
993 if (FNDECL_USED_AUTO (olddecl))
994 r2 = DECL_STRUCT_FUNCTION (olddecl)->language->x_auto_return_pattern;
998 if (same_type_p (TREE_TYPE (f1), r2))
1000 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
1001 && (DECL_BUILT_IN (olddecl)
1002 #ifndef NO_IMPLICIT_EXTERN_C
1003 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
1004 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1008 types_match = self_promoting_args_p (p1);
1009 if (p1 == void_list_node)
1010 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1012 #ifndef NO_IMPLICIT_EXTERN_C
1013 else if (!prototype_p (f1)
1014 && (DECL_EXTERN_C_P (olddecl)
1015 && DECL_IN_SYSTEM_HEADER (olddecl)
1016 && !DECL_CLASS_SCOPE_P (olddecl))
1017 && (DECL_EXTERN_C_P (newdecl)
1018 && DECL_IN_SYSTEM_HEADER (newdecl)
1019 && !DECL_CLASS_SCOPE_P (newdecl)))
1021 types_match = self_promoting_args_p (p2);
1022 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1028 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1029 || comp_type_attributes (TREE_TYPE (newdecl),
1030 TREE_TYPE (olddecl)) != 0);
1035 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1037 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1038 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1041 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1042 DECL_TEMPLATE_PARMS (olddecl)))
1045 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1046 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1047 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1049 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1050 DECL_TEMPLATE_RESULT (newdecl));
1054 /* Need to check scope for variable declaration (VAR_DECL).
1055 For typedef (TYPE_DECL), scope is ignored. */
1056 if (TREE_CODE (newdecl) == VAR_DECL
1057 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1059 Two declarations for an object with C language linkage
1060 with the same name (ignoring the namespace that qualify
1061 it) that appear in different namespace scopes refer to
1063 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1066 if (TREE_TYPE (newdecl) == error_mark_node)
1067 types_match = TREE_TYPE (olddecl) == error_mark_node;
1068 else if (TREE_TYPE (olddecl) == NULL_TREE)
1069 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1070 else if (TREE_TYPE (newdecl) == NULL_TREE)
1073 types_match = comptypes (TREE_TYPE (newdecl),
1074 TREE_TYPE (olddecl),
1075 COMPARE_REDECLARATION);
1081 /* If NEWDECL is `static' and an `extern' was seen previously,
1082 warn about it. OLDDECL is the previous declaration.
1084 Note that this does not apply to the C++ case of declaring
1085 a variable `extern const' and then later `const'.
1087 Don't complain about built-in functions, since they are beyond
1088 the user's control. */
1091 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1093 if (TREE_CODE (newdecl) == TYPE_DECL
1094 || TREE_CODE (newdecl) == TEMPLATE_DECL
1095 || TREE_CODE (newdecl) == CONST_DECL
1096 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1099 /* Don't get confused by static member functions; that's a different
1101 if (TREE_CODE (newdecl) == FUNCTION_DECL
1102 && DECL_STATIC_FUNCTION_P (newdecl))
1105 /* If the old declaration was `static', or the new one isn't, then
1106 everything is OK. */
1107 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1110 /* It's OK to declare a builtin function as `static'. */
1111 if (TREE_CODE (olddecl) == FUNCTION_DECL
1112 && DECL_ARTIFICIAL (olddecl))
1115 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1116 permerror (input_location, "previous declaration of %q+D", olddecl);
1119 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1120 function templates. If their exception specifications do not
1121 match, issue a diagnostic. */
1124 check_redeclaration_exception_specification (tree new_decl,
1129 tree new_exceptions;
1130 tree old_exceptions;
1132 new_type = TREE_TYPE (new_decl);
1133 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1134 old_type = TREE_TYPE (old_decl);
1135 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1139 If any declaration of a function has an exception-specification,
1140 all declarations, including the definition and an explicit
1141 specialization, of that function shall have an
1142 exception-specification with the same set of type-ids. */
1143 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1144 && ! DECL_IS_BUILTIN (old_decl)
1146 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1148 error ("declaration of %qF has a different exception specifier",
1150 error ("from previous declaration %q+F", old_decl);
1154 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1155 Otherwise issue diagnostics. */
1158 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1160 old_decl = STRIP_TEMPLATE (old_decl);
1161 new_decl = STRIP_TEMPLATE (new_decl);
1162 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1163 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1165 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1166 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1168 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1170 /* Hide a built-in declaration. */
1171 DECL_DECLARED_CONSTEXPR_P (old_decl)
1172 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1175 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1176 error ("from previous declaration %q+D", old_decl);
1180 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1181 && lookup_attribute ("gnu_inline", \
1182 DECL_ATTRIBUTES (fn)))
1184 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1185 If the redeclaration is invalid, a diagnostic is issued, and the
1186 error_mark_node is returned. Otherwise, OLDDECL is returned.
1188 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1191 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1194 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1196 unsigned olddecl_uid = DECL_UID (olddecl);
1197 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1198 int new_defines_function = 0;
1199 tree new_template_info;
1201 if (newdecl == olddecl)
1204 types_match = decls_match (newdecl, olddecl);
1206 /* If either the type of the new decl or the type of the old decl is an
1207 error_mark_node, then that implies that we have already issued an
1208 error (earlier) for some bogus type specification, and in that case,
1209 it is rather pointless to harass the user with yet more error message
1210 about the same declaration, so just pretend the types match here. */
1211 if (TREE_TYPE (newdecl) == error_mark_node
1212 || TREE_TYPE (olddecl) == error_mark_node)
1213 return error_mark_node;
1215 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1216 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1218 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1219 && TREE_CODE (olddecl) != TEMPLATE_DECL
1220 && check_raw_literal_operator (olddecl))
1221 error ("literal operator template %q+D conflicts with"
1222 " raw literal operator %qD", newdecl, olddecl);
1223 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1224 && TREE_CODE (olddecl) == TEMPLATE_DECL
1225 && check_raw_literal_operator (newdecl))
1226 error ("raw literal operator %q+D conflicts with"
1227 " literal operator template %qD", newdecl, olddecl);
1230 if (DECL_P (olddecl)
1231 && TREE_CODE (newdecl) == FUNCTION_DECL
1232 && TREE_CODE (olddecl) == FUNCTION_DECL
1233 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1235 if (DECL_DECLARED_INLINE_P (newdecl)
1236 && DECL_UNINLINABLE (newdecl)
1237 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1238 /* Already warned elsewhere. */;
1239 else if (DECL_DECLARED_INLINE_P (olddecl)
1240 && DECL_UNINLINABLE (olddecl)
1241 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1242 /* Already warned. */;
1243 else if (DECL_DECLARED_INLINE_P (newdecl)
1244 && DECL_UNINLINABLE (olddecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1249 warning (OPT_Wattributes, "previous declaration of %q+D "
1250 "with attribute noinline", olddecl);
1252 else if (DECL_DECLARED_INLINE_P (olddecl)
1253 && DECL_UNINLINABLE (newdecl)
1254 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1256 warning (OPT_Wattributes, "function %q+D redeclared with "
1257 "attribute noinline", newdecl);
1258 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1263 /* Check for redeclaration and other discrepancies. */
1264 if (TREE_CODE (olddecl) == FUNCTION_DECL
1265 && DECL_ARTIFICIAL (olddecl))
1267 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1268 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1270 /* Avoid warnings redeclaring built-ins which have not been
1271 explicitly declared. */
1272 if (DECL_ANTICIPATED (olddecl))
1275 /* If you declare a built-in or predefined function name as static,
1276 the old definition is overridden, but optionally warn this was a
1277 bad choice of name. */
1278 if (! TREE_PUBLIC (newdecl))
1280 warning (OPT_Wshadow,
1281 DECL_BUILT_IN (olddecl)
1282 ? G_("shadowing built-in function %q#D")
1283 : G_("shadowing library function %q#D"), olddecl);
1284 /* Discard the old built-in function. */
1287 /* If the built-in is not ansi, then programs can override
1288 it even globally without an error. */
1289 else if (! DECL_BUILT_IN (olddecl))
1290 warning (0, "library function %q#D redeclared as non-function %q#D",
1294 error ("declaration of %q#D", newdecl);
1295 error ("conflicts with built-in declaration %q#D",
1300 else if (!types_match)
1302 /* Avoid warnings redeclaring built-ins which have not been
1303 explicitly declared. */
1304 if (DECL_ANTICIPATED (olddecl))
1306 /* Deal with fileptr_type_node. FILE type is not known
1307 at the time we create the builtins. */
1310 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1311 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1313 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1316 else if (TREE_VALUE (t2) == fileptr_type_node)
1318 tree t = TREE_VALUE (t1);
1320 if (TREE_CODE (t) == POINTER_TYPE
1321 && TYPE_NAME (TREE_TYPE (t))
1322 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1323 == get_identifier ("FILE")
1324 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1326 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1328 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1329 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1330 types_match = decls_match (newdecl, olddecl);
1332 return duplicate_decls (newdecl, olddecl,
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1337 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1340 else if ((DECL_EXTERN_C_P (newdecl)
1341 && DECL_EXTERN_C_P (olddecl))
1342 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1343 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1345 /* A near match; override the builtin. */
1347 if (TREE_PUBLIC (newdecl))
1349 warning (0, "new declaration %q#D", newdecl);
1350 warning (0, "ambiguates built-in declaration %q#D",
1354 warning (OPT_Wshadow,
1355 DECL_BUILT_IN (olddecl)
1356 ? G_("shadowing built-in function %q#D")
1357 : G_("shadowing library function %q#D"), olddecl);
1360 /* Discard the old built-in function. */
1363 /* Replace the old RTL to avoid problems with inlining. */
1364 COPY_DECL_RTL (newdecl, olddecl);
1366 /* Even if the types match, prefer the new declarations type for
1367 built-ins which have not been explicitly declared, for
1368 exception lists, etc... */
1369 else if (DECL_IS_BUILTIN (olddecl))
1371 tree type = TREE_TYPE (newdecl);
1372 tree attribs = (*targetm.merge_type_attributes)
1373 (TREE_TYPE (olddecl), type);
1375 type = cp_build_type_attribute_variant (type, attribs);
1376 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1379 /* If a function is explicitly declared "throw ()", propagate that to
1380 the corresponding builtin. */
1381 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1382 && DECL_ANTICIPATED (olddecl)
1383 && TREE_NOTHROW (newdecl)
1384 && !TREE_NOTHROW (olddecl))
1386 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1387 tree tmpdecl = builtin_decl_explicit (fncode);
1388 if (tmpdecl && tmpdecl != olddecl && types_match)
1389 TREE_NOTHROW (tmpdecl) = 1;
1392 /* Whether or not the builtin can throw exceptions has no
1393 bearing on this declarator. */
1394 TREE_NOTHROW (olddecl) = 0;
1396 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1398 /* If a builtin function is redeclared as `static', merge
1399 the declarations, but make the original one static. */
1400 DECL_THIS_STATIC (olddecl) = 1;
1401 TREE_PUBLIC (olddecl) = 0;
1403 /* Make the old declaration consistent with the new one so
1404 that all remnants of the builtin-ness of this function
1405 will be banished. */
1406 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1407 COPY_DECL_RTL (newdecl, olddecl);
1410 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1412 /* C++ Standard, 3.3, clause 4:
1413 "[Note: a namespace name or a class template name must be unique
1414 in its declarative region (7.3.2, clause 14). ]" */
1415 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1416 && TREE_CODE (newdecl) != NAMESPACE_DECL
1417 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1418 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1419 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1420 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1422 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1423 && TREE_CODE (newdecl) != TYPE_DECL)
1424 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1425 && TREE_CODE (olddecl) != TYPE_DECL))
1427 /* We do nothing special here, because C++ does such nasty
1428 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1429 get shadowed, and know that if we need to find a TYPE_DECL
1430 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1431 slot of the identifier. */
1435 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1436 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1437 || (TREE_CODE (olddecl) == FUNCTION_DECL
1438 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1442 error ("%q#D redeclared as different kind of symbol", newdecl);
1443 if (TREE_CODE (olddecl) == TREE_LIST)
1444 olddecl = TREE_VALUE (olddecl);
1445 error ("previous declaration of %q+#D", olddecl);
1447 return error_mark_node;
1449 else if (!types_match)
1451 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1452 /* These are certainly not duplicate declarations; they're
1453 from different scopes. */
1456 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1458 /* The name of a class template may not be declared to refer to
1459 any other template, class, function, object, namespace, value,
1460 or type in the same scope. */
1461 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1462 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1464 error ("declaration of template %q#D", newdecl);
1465 error ("conflicts with previous declaration %q+#D", olddecl);
1466 return error_mark_node;
1468 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1469 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1470 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1471 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1472 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1473 DECL_TEMPLATE_PARMS (olddecl))
1474 /* Template functions can be disambiguated by
1476 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1477 TREE_TYPE (TREE_TYPE (olddecl))))
1479 error ("new declaration %q#D", newdecl);
1480 error ("ambiguates old declaration %q+#D", olddecl);
1484 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1486 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1488 error ("declaration of C function %q#D conflicts with",
1490 error ("previous declaration %q+#D here", olddecl);
1493 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1494 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1496 error ("new declaration %q#D", newdecl);
1497 if (FNDECL_USED_AUTO (olddecl))
1498 error_at (DECL_SOURCE_LOCATION (olddecl), "ambiguates old "
1499 "declaration with deduced return type");
1501 error ("ambiguates old declaration %q+#D", olddecl);
1502 return error_mark_node;
1509 error ("conflicting declaration %q#D", newdecl);
1510 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1511 return error_mark_node;
1514 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1515 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1516 && (!DECL_TEMPLATE_INFO (newdecl)
1517 || (DECL_TI_TEMPLATE (newdecl)
1518 != DECL_TI_TEMPLATE (olddecl))))
1519 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1520 && (!DECL_TEMPLATE_INFO (olddecl)
1521 || (DECL_TI_TEMPLATE (olddecl)
1522 != DECL_TI_TEMPLATE (newdecl))))))
1523 /* It's OK to have a template specialization and a non-template
1524 with the same type, or to have specializations of two
1525 different templates with the same type. Note that if one is a
1526 specialization, and the other is an instantiation of the same
1527 template, that we do not exit at this point. That situation
1528 can occur if we instantiate a template class, and then
1529 specialize one of its methods. This situation is valid, but
1530 the declarations must be merged in the usual way. */
1532 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1533 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1534 && !DECL_USE_TEMPLATE (newdecl))
1535 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1536 && !DECL_USE_TEMPLATE (olddecl))))
1537 /* One of the declarations is a template instantiation, and the
1538 other is not a template at all. That's OK. */
1540 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1542 /* In [namespace.alias] we have:
1544 In a declarative region, a namespace-alias-definition can be
1545 used to redefine a namespace-alias declared in that declarative
1546 region to refer only to the namespace to which it already
1549 Therefore, if we encounter a second alias directive for the same
1550 alias, we can just ignore the second directive. */
1551 if (DECL_NAMESPACE_ALIAS (newdecl)
1552 && (DECL_NAMESPACE_ALIAS (newdecl)
1553 == DECL_NAMESPACE_ALIAS (olddecl)))
1555 /* [namespace.alias]
1557 A namespace-name or namespace-alias shall not be declared as
1558 the name of any other entity in the same declarative region.
1559 A namespace-name defined at global scope shall not be
1560 declared as the name of any other entity in any global scope
1562 error ("declaration of namespace %qD conflicts with", newdecl);
1563 error ("previous declaration of namespace %q+D here", olddecl);
1564 return error_mark_node;
1568 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1571 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1572 if (DECL_NAME (olddecl) != NULL_TREE)
1573 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1574 ? G_("%q+#D previously defined here")
1575 : G_("%q+#D previously declared here"), olddecl);
1576 return error_mark_node;
1578 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1579 && DECL_INITIAL (olddecl) != NULL_TREE
1580 && !prototype_p (TREE_TYPE (olddecl))
1581 && prototype_p (TREE_TYPE (newdecl)))
1583 /* Prototype decl follows defn w/o prototype. */
1584 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1585 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1586 "follows non-prototype definition here");
1588 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1589 || TREE_CODE (olddecl) == VAR_DECL)
1590 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1593 If two declarations of the same function or object
1594 specify different linkage-specifications ..., the program
1595 is ill-formed.... Except for functions with C++ linkage,
1596 a function declaration without a linkage specification
1597 shall not precede the first linkage specification for
1598 that function. A function can be declared without a
1599 linkage specification after an explicit linkage
1600 specification has been seen; the linkage explicitly
1601 specified in the earlier declaration is not affected by
1602 such a function declaration.
1604 DR 563 raises the question why the restrictions on
1605 functions should not also apply to objects. Older
1606 versions of G++ silently ignore the linkage-specification
1614 which is clearly wrong. Therefore, we now treat objects
1616 if (current_lang_depth () == 0)
1618 /* There is no explicit linkage-specification, so we use
1619 the linkage from the previous declaration. */
1620 if (!DECL_LANG_SPECIFIC (newdecl))
1621 retrofit_lang_decl (newdecl);
1622 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1626 error ("previous declaration of %q+#D with %qL linkage",
1627 olddecl, DECL_LANGUAGE (olddecl));
1628 error ("conflicts with new declaration with %qL linkage",
1629 DECL_LANGUAGE (newdecl));
1633 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1635 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1637 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1638 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1641 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1642 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1644 for (; t1 && t1 != void_list_node;
1645 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1646 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1648 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1651 permerror (input_location, "default argument given for parameter %d of %q#D",
1653 permerror (input_location, "after previous specification in %q+#D", olddecl);
1657 error ("default argument given for parameter %d of %q#D",
1659 error ("after previous specification in %q+#D",
1666 /* Do not merge an implicit typedef with an explicit one. In:
1670 typedef class A A __attribute__ ((foo));
1672 the attribute should apply only to the typedef. */
1673 if (TREE_CODE (olddecl) == TYPE_DECL
1674 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1675 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1678 /* If new decl is `static' and an `extern' was seen previously,
1680 warn_extern_redeclared_static (newdecl, olddecl);
1682 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1683 return error_mark_node;
1685 /* We have committed to returning 1 at this point. */
1686 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1688 /* Now that functions must hold information normally held
1689 by field decls, there is extra work to do so that
1690 declaration information does not get destroyed during
1692 if (DECL_VINDEX (olddecl))
1693 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1694 if (DECL_CONTEXT (olddecl))
1695 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1696 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1697 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1698 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1699 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1700 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1701 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1702 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1703 SET_OVERLOADED_OPERATOR_CODE
1704 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1705 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1707 /* Optionally warn about more than one declaration for the same
1708 name, but don't warn about a function declaration followed by a
1710 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1711 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1712 /* Don't warn about extern decl followed by definition. */
1713 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1714 /* Don't warn about friends, let add_friend take care of it. */
1715 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1716 /* Don't warn about declaration followed by specialization. */
1717 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1718 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1720 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1721 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1724 if (DECL_DELETED_FN (newdecl))
1726 error ("deleted definition of %qD", newdecl);
1727 error ("after previous declaration %q+D", olddecl);
1729 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1732 /* Deal with C++: must preserve virtual function table size. */
1733 if (TREE_CODE (olddecl) == TYPE_DECL)
1735 tree newtype = TREE_TYPE (newdecl);
1736 tree oldtype = TREE_TYPE (olddecl);
1738 if (newtype != error_mark_node && oldtype != error_mark_node
1739 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1740 CLASSTYPE_FRIEND_CLASSES (newtype)
1741 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1743 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1746 /* Copy all the DECL_... slots specified in the new decl
1747 except for any that we copy here from the old type. */
1748 DECL_ATTRIBUTES (newdecl)
1749 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1751 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1755 old_result = DECL_TEMPLATE_RESULT (olddecl);
1756 new_result = DECL_TEMPLATE_RESULT (newdecl);
1757 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1758 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1759 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1760 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1762 DECL_ATTRIBUTES (old_result)
1763 = (*targetm.merge_decl_attributes) (old_result, new_result);
1765 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1767 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1768 && DECL_INITIAL (new_result))
1770 if (DECL_INITIAL (old_result))
1771 DECL_UNINLINABLE (old_result) = 1;
1773 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1774 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1775 DECL_NOT_REALLY_EXTERN (old_result)
1776 = DECL_NOT_REALLY_EXTERN (new_result);
1777 DECL_INTERFACE_KNOWN (old_result)
1778 = DECL_INTERFACE_KNOWN (new_result);
1779 DECL_DECLARED_INLINE_P (old_result)
1780 = DECL_DECLARED_INLINE_P (new_result);
1781 DECL_DISREGARD_INLINE_LIMITS (old_result)
1782 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1787 DECL_DECLARED_INLINE_P (old_result)
1788 |= DECL_DECLARED_INLINE_P (new_result);
1789 DECL_DISREGARD_INLINE_LIMITS (old_result)
1790 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1791 check_redeclaration_exception_specification (newdecl, olddecl);
1795 /* If the new declaration is a definition, update the file and
1796 line information on the declaration, and also make
1797 the old declaration the same definition. */
1798 if (DECL_INITIAL (new_result) != NULL_TREE)
1800 DECL_SOURCE_LOCATION (olddecl)
1801 = DECL_SOURCE_LOCATION (old_result)
1802 = DECL_SOURCE_LOCATION (newdecl);
1803 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1804 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1807 DECL_ARGUMENTS (old_result)
1808 = DECL_ARGUMENTS (new_result);
1809 for (parm = DECL_ARGUMENTS (old_result); parm;
1810 parm = DECL_CHAIN (parm))
1811 DECL_CONTEXT (parm) = old_result;
1820 /* Automatically handles default parameters. */
1821 tree oldtype = TREE_TYPE (olddecl);
1824 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1825 maybe_instantiate_noexcept (olddecl);
1827 /* Merge the data types specified in the two decls. */
1828 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1830 /* If merge_types produces a non-typedef type, just use the old type. */
1831 if (TREE_CODE (newdecl) == TYPE_DECL
1832 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1835 if (TREE_CODE (newdecl) == VAR_DECL)
1837 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1838 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1839 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1840 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1841 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1842 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1844 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1845 if (DECL_LANG_SPECIFIC (olddecl)
1846 && CP_DECL_THREADPRIVATE_P (olddecl))
1848 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1849 if (!DECL_LANG_SPECIFIC (newdecl))
1850 retrofit_lang_decl (newdecl);
1852 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1853 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1857 /* Do this after calling `merge_types' so that default
1858 parameters don't confuse us. */
1859 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1860 check_redeclaration_exception_specification (newdecl, olddecl);
1861 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1863 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1864 check_default_args (newdecl);
1866 /* Lay the type out, unless already done. */
1867 if (! same_type_p (newtype, oldtype)
1868 && TREE_TYPE (newdecl) != error_mark_node
1869 && !(processing_template_decl && uses_template_parms (newdecl)))
1870 layout_type (TREE_TYPE (newdecl));
1872 if ((TREE_CODE (newdecl) == VAR_DECL
1873 || TREE_CODE (newdecl) == PARM_DECL
1874 || TREE_CODE (newdecl) == RESULT_DECL
1875 || TREE_CODE (newdecl) == FIELD_DECL
1876 || TREE_CODE (newdecl) == TYPE_DECL)
1877 && !(processing_template_decl && uses_template_parms (newdecl)))
1878 layout_decl (newdecl, 0);
1880 /* Merge the type qualifiers. */
1881 if (TREE_READONLY (newdecl))
1882 TREE_READONLY (olddecl) = 1;
1883 if (TREE_THIS_VOLATILE (newdecl))
1884 TREE_THIS_VOLATILE (olddecl) = 1;
1885 if (TREE_NOTHROW (newdecl))
1886 TREE_NOTHROW (olddecl) = 1;
1888 /* Merge deprecatedness. */
1889 if (TREE_DEPRECATED (newdecl))
1890 TREE_DEPRECATED (olddecl) = 1;
1892 /* Preserve function specific target and optimization options */
1893 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1895 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1896 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1897 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1898 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1900 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1901 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1902 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1903 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1906 /* Merge the initialization information. */
1907 if (DECL_INITIAL (newdecl) == NULL_TREE
1908 && DECL_INITIAL (olddecl) != NULL_TREE)
1910 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1911 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1912 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1914 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1915 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1919 /* Merge the section attribute.
1920 We want to issue an error if the sections conflict but that must be
1921 done later in decl_attributes since we are called before attributes
1923 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1924 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1926 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1928 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1929 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1930 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1931 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1932 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1933 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1934 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1935 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1936 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1937 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1938 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1939 /* Keep the old RTL. */
1940 COPY_DECL_RTL (olddecl, newdecl);
1942 else if (TREE_CODE (newdecl) == VAR_DECL
1943 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1945 /* Keep the old RTL. We cannot keep the old RTL if the old
1946 declaration was for an incomplete object and the new
1947 declaration is not since many attributes of the RTL will
1949 COPY_DECL_RTL (olddecl, newdecl);
1952 /* If cannot merge, then use the new type and qualifiers,
1953 and don't preserve the old rtl. */
1956 /* Clean out any memory we had of the old declaration. */
1957 tree oldstatic = value_member (olddecl, static_aggregates);
1959 TREE_VALUE (oldstatic) = error_mark_node;
1961 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1962 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1963 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1964 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1967 /* Merge the storage class information. */
1968 merge_weak (newdecl, olddecl);
1970 if (DECL_ONE_ONLY (olddecl))
1971 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1973 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1974 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1975 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1976 if (! DECL_EXTERNAL (olddecl))
1977 DECL_EXTERNAL (newdecl) = 0;
1979 new_template_info = NULL_TREE;
1980 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1982 bool new_redefines_gnu_inline = false;
1984 if (new_defines_function
1985 && ((DECL_INTERFACE_KNOWN (olddecl)
1986 && TREE_CODE (olddecl) == FUNCTION_DECL)
1987 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1988 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1989 == FUNCTION_DECL))))
1993 if (TREE_CODE (fn) == TEMPLATE_DECL)
1994 fn = DECL_TEMPLATE_RESULT (olddecl);
1996 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1999 if (!new_redefines_gnu_inline)
2001 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
2002 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
2003 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
2005 DECL_TEMPLATE_INSTANTIATED (newdecl)
2006 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
2007 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
2009 /* If the OLDDECL is an instantiation and/or specialization,
2010 then the NEWDECL must be too. But, it may not yet be marked
2011 as such if the caller has created NEWDECL, but has not yet
2012 figured out that it is a redeclaration. */
2013 if (!DECL_USE_TEMPLATE (newdecl))
2014 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2016 /* Don't really know how much of the language-specific
2017 values we should copy from old to new. */
2018 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2019 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2020 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2021 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2023 if (LANG_DECL_HAS_MIN (newdecl))
2025 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2026 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2027 if (DECL_TEMPLATE_INFO (newdecl))
2028 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2029 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2031 /* Only functions have these fields. */
2032 if (TREE_CODE (newdecl) == FUNCTION_DECL
2033 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2035 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2036 olddecl_friend = DECL_FRIEND_P (olddecl);
2037 hidden_friend = (DECL_ANTICIPATED (olddecl)
2038 && DECL_HIDDEN_FRIEND_P (olddecl)
2039 && newdecl_is_friend);
2040 DECL_BEFRIENDING_CLASSES (newdecl)
2041 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2042 DECL_BEFRIENDING_CLASSES (olddecl));
2043 /* DECL_THUNKS is only valid for virtual functions,
2044 otherwise it is a DECL_FRIEND_CONTEXT. */
2045 if (DECL_VIRTUAL_P (newdecl))
2046 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2048 /* Only variables have this field. */
2049 else if (TREE_CODE (newdecl) == VAR_DECL
2050 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2051 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2054 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2058 /* Merge parameter attributes. */
2059 tree oldarg, newarg;
2060 for (oldarg = DECL_ARGUMENTS(olddecl),
2061 newarg = DECL_ARGUMENTS(newdecl);
2063 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2064 DECL_ATTRIBUTES (newarg)
2065 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2066 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2069 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2070 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2072 /* If newdecl is not a specialization, then it is not a
2073 template-related function at all. And that means that we
2074 should have exited above, returning 0. */
2075 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2077 if (DECL_ODR_USED (olddecl))
2078 /* From [temp.expl.spec]:
2080 If a template, a member template or the member of a class
2081 template is explicitly specialized then that
2082 specialization shall be declared before the first use of
2083 that specialization that would cause an implicit
2084 instantiation to take place, in every translation unit in
2085 which such a use occurs. */
2086 error ("explicit specialization of %qD after first use",
2089 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2091 /* Don't propagate visibility from the template to the
2092 specialization here. We'll do that in determine_visibility if
2094 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2096 /* [temp.expl.spec/14] We don't inline explicit specialization
2097 just because the primary template says so. */
2099 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2100 the always_inline attribute. */
2101 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2102 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2104 if (DECL_DECLARED_INLINE_P (newdecl))
2105 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2107 DECL_ATTRIBUTES (newdecl)
2108 = remove_attribute ("always_inline",
2109 DECL_ATTRIBUTES (newdecl));
2112 else if (new_defines_function && DECL_INITIAL (olddecl))
2114 /* Never inline re-defined extern inline functions.
2115 FIXME: this could be better handled by keeping both
2116 function as separate declarations. */
2117 DECL_UNINLINABLE (newdecl) = 1;
2121 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2122 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2124 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2126 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2127 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2129 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2130 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2131 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2132 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2135 /* Preserve abstractness on cloned [cd]tors. */
2136 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2138 /* Update newdecl's parms to point at olddecl. */
2139 for (parm = DECL_ARGUMENTS (newdecl); parm;
2140 parm = DECL_CHAIN (parm))
2141 DECL_CONTEXT (parm) = olddecl;
2145 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2146 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2147 COPY_DECL_RTL (newdecl, olddecl);
2149 if (! types_match || new_defines_function)
2151 /* These need to be copied so that the names are available.
2152 Note that if the types do match, we'll preserve inline
2153 info and other bits, but if not, we won't. */
2154 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2155 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2157 if (new_defines_function)
2158 /* If defining a function declared with other language
2159 linkage, use the previously declared language linkage. */
2160 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2161 else if (types_match)
2163 /* If redeclaring a builtin function, and not a definition,
2164 it stays built in. */
2165 if (DECL_BUILT_IN (olddecl))
2167 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2168 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2169 /* If we're keeping the built-in definition, keep the rtl,
2170 regardless of declaration matches. */
2171 COPY_DECL_RTL (olddecl, newdecl);
2172 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2174 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2177 /* If a compatible prototype of these builtin functions
2178 is seen, assume the runtime implements it with the
2179 expected semantics. */
2180 case BUILT_IN_STPCPY:
2181 if (builtin_decl_explicit_p (fncode))
2182 set_builtin_decl_implicit_p (fncode, true);
2190 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2191 /* Don't clear out the arguments if we're just redeclaring a
2193 if (DECL_ARGUMENTS (olddecl))
2194 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2197 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2198 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2200 /* Now preserve various other info from the definition. */
2201 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2202 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2203 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2204 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2206 /* Warn about conflicting visibility specifications. */
2207 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2208 && DECL_VISIBILITY_SPECIFIED (newdecl)
2209 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2211 warning_at (input_location, OPT_Wattributes,
2212 "%q+D: visibility attribute ignored because it", newdecl);
2213 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2214 "conflicts with previous declaration here");
2216 /* Choose the declaration which specified visibility. */
2217 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2219 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2220 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2222 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2223 so keep this behavior. */
2224 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2226 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2227 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2229 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2230 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2232 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2233 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2235 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2236 if (TREE_CODE (newdecl) == FIELD_DECL)
2237 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2239 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2240 with that from NEWDECL below. */
2241 if (DECL_LANG_SPECIFIC (olddecl))
2243 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2244 != DECL_LANG_SPECIFIC (newdecl));
2245 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2248 /* Merge the USED information. */
2249 if (TREE_USED (olddecl))
2250 TREE_USED (newdecl) = 1;
2251 else if (TREE_USED (newdecl))
2252 TREE_USED (olddecl) = 1;
2253 if (TREE_CODE (newdecl) == VAR_DECL)
2255 if (DECL_READ_P (olddecl))
2256 DECL_READ_P (newdecl) = 1;
2257 else if (DECL_READ_P (newdecl))
2258 DECL_READ_P (olddecl) = 1;
2260 if (DECL_PRESERVE_P (olddecl))
2261 DECL_PRESERVE_P (newdecl) = 1;
2262 else if (DECL_PRESERVE_P (newdecl))
2263 DECL_PRESERVE_P (olddecl) = 1;
2265 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2269 function_size = sizeof (struct tree_decl_common);
2271 memcpy ((char *) olddecl + sizeof (struct tree_common),
2272 (char *) newdecl + sizeof (struct tree_common),
2273 function_size - sizeof (struct tree_common));
2275 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2276 (char *) newdecl + sizeof (struct tree_decl_common),
2277 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2278 if (new_template_info)
2279 /* If newdecl is a template instantiation, it is possible that
2280 the following sequence of events has occurred:
2282 o A friend function was declared in a class template. The
2283 class template was instantiated.
2285 o The instantiation of the friend declaration was
2286 recorded on the instantiation list, and is newdecl.
2288 o Later, however, instantiate_class_template called pushdecl
2289 on the newdecl to perform name injection. But, pushdecl in
2290 turn called duplicate_decls when it discovered that another
2291 declaration of a global function with the same name already
2294 o Here, in duplicate_decls, we decided to clobber newdecl.
2296 If we're going to do that, we'd better make sure that
2297 olddecl, and not newdecl, is on the list of
2298 instantiations so that if we try to do the instantiation
2299 again we won't get the clobbered declaration. */
2300 reregister_specialization (newdecl,
2306 size_t size = tree_code_size (TREE_CODE (olddecl));
2307 memcpy ((char *) olddecl + sizeof (struct tree_common),
2308 (char *) newdecl + sizeof (struct tree_common),
2309 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2310 switch (TREE_CODE (olddecl))
2320 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2321 (char *) newdecl + sizeof (struct tree_decl_common),
2322 size - sizeof (struct tree_decl_common)
2323 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2327 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2328 (char *) newdecl + sizeof (struct tree_decl_common),
2329 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2330 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2334 DECL_UID (olddecl) = olddecl_uid;
2336 DECL_FRIEND_P (olddecl) = 1;
2339 DECL_ANTICIPATED (olddecl) = 1;
2340 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2343 /* NEWDECL contains the merged attribute lists.
2344 Update OLDDECL to be the same. */
2345 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2347 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2348 so that encode_section_info has a chance to look at the new decl
2349 flags and attributes. */
2350 if (DECL_RTL_SET_P (olddecl)
2351 && (TREE_CODE (olddecl) == FUNCTION_DECL
2352 || (TREE_CODE (olddecl) == VAR_DECL
2353 && TREE_STATIC (olddecl))))
2354 make_decl_rtl (olddecl);
2356 /* The NEWDECL will no longer be needed. Because every out-of-class
2357 declaration of a member results in a call to duplicate_decls,
2358 freeing these nodes represents in a significant savings. */
2364 /* Return zero if the declaration NEWDECL is valid
2365 when the declaration OLDDECL (assumed to be for the same name)
2366 has already been seen.
2367 Otherwise return an error message format string with a %s
2368 where the identifier should go. */
2371 redeclaration_error_message (tree newdecl, tree olddecl)
2373 if (TREE_CODE (newdecl) == TYPE_DECL)
2375 /* Because C++ can put things into name space for free,
2376 constructs like "typedef struct foo { ... } foo"
2377 would look like an erroneous redeclaration. */
2378 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2381 return G_("redefinition of %q#D");
2383 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2385 /* If this is a pure function, its olddecl will actually be
2386 the original initialization to `0' (which we force to call
2387 abort()). Don't complain about redefinition in this case. */
2388 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2389 && DECL_INITIAL (olddecl) == NULL_TREE)
2392 /* If both functions come from different namespaces, this is not
2393 a redeclaration - this is a conflict with a used function. */
2394 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2395 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2396 && ! decls_match (olddecl, newdecl))
2397 return G_("%qD conflicts with used function");
2399 /* We'll complain about linkage mismatches in
2400 warn_extern_redeclared_static. */
2402 /* Defining the same name twice is no good. */
2403 if (DECL_INITIAL (olddecl) != NULL_TREE
2404 && DECL_INITIAL (newdecl) != NULL_TREE)
2406 if (DECL_NAME (olddecl) == NULL_TREE)
2407 return G_("%q#D not declared in class");
2408 else if (!GNU_INLINE_P (olddecl)
2409 || GNU_INLINE_P (newdecl))
2410 return G_("redefinition of %q#D");
2413 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2415 bool olda = GNU_INLINE_P (olddecl);
2416 bool newa = GNU_INLINE_P (newdecl);
2421 return G_("%q+D redeclared inline with "
2422 "%<gnu_inline%> attribute");
2424 return G_("%q+D redeclared inline without "
2425 "%<gnu_inline%> attribute");
2431 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2435 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2437 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2438 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2439 return G_("redefinition of %q#D");
2443 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2444 || (DECL_TEMPLATE_RESULT (newdecl)
2445 == DECL_TEMPLATE_RESULT (olddecl)))
2448 nt = DECL_TEMPLATE_RESULT (newdecl);
2449 if (DECL_TEMPLATE_INFO (nt))
2450 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2451 ot = DECL_TEMPLATE_RESULT (olddecl);
2452 if (DECL_TEMPLATE_INFO (ot))
2453 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2454 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2455 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2456 return G_("redefinition of %q#D");
2458 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2460 bool olda = GNU_INLINE_P (ot);
2461 bool newa = GNU_INLINE_P (nt);
2466 return G_("%q+D redeclared inline with "
2467 "%<gnu_inline%> attribute");
2469 return G_("%q+D redeclared inline without "
2470 "%<gnu_inline%> attribute");
2474 /* Core issue #226 (C++0x):
2476 If a friend function template declaration specifies a
2477 default template-argument, that declaration shall be a
2478 definition and shall be the only declaration of the
2479 function template in the translation unit. */
2480 if ((cxx_dialect != cxx98)
2481 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2482 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2483 /*is_primary=*/true,
2484 /*is_partial=*/false,
2485 /*is_friend_decl=*/2))
2486 return G_("redeclaration of friend %q#D "
2487 "may not have default template arguments");
2491 else if (TREE_CODE (newdecl) == VAR_DECL
2492 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2493 && (! DECL_LANG_SPECIFIC (olddecl)
2494 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2495 || DECL_THREAD_LOCAL_P (newdecl)))
2497 /* Only variables can be thread-local, and all declarations must
2498 agree on this property. */
2499 if (DECL_THREAD_LOCAL_P (newdecl))
2500 return G_("thread-local declaration of %q#D follows "
2501 "non-thread-local declaration");
2503 return G_("non-thread-local declaration of %q#D follows "
2504 "thread-local declaration");
2506 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2508 /* The objects have been declared at namespace scope. If either
2509 is a member of an anonymous union, then this is an invalid
2510 redeclaration. For example:
2516 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2517 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2518 return G_("redeclaration of %q#D");
2519 /* If at least one declaration is a reference, there is no
2520 conflict. For example:
2526 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2528 /* Reject two definitions. */
2529 return G_("redefinition of %q#D");
2533 /* Objects declared with block scope: */
2534 /* Reject two definitions, and reject a definition
2535 together with an external reference. */
2536 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2537 return G_("redeclaration of %q#D");
2542 /* Hash and equality functions for the named_label table. */
2545 named_label_entry_hash (const void *data)
2547 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2548 return DECL_UID (ent->label_decl);
2552 named_label_entry_eq (const void *a, const void *b)
2554 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2555 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2556 return ent_a->label_decl == ent_b->label_decl;
2559 /* Create a new label, named ID. */
2562 make_label_decl (tree id, int local_p)
2564 struct named_label_entry *ent;
2568 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2570 DECL_CONTEXT (decl) = current_function_decl;
2571 DECL_MODE (decl) = VOIDmode;
2572 C_DECLARED_LABEL_FLAG (decl) = local_p;
2574 /* Say where one reference is to the label, for the sake of the
2575 error if it is not defined. */
2576 DECL_SOURCE_LOCATION (decl) = input_location;
2578 /* Record the fact that this identifier is bound to this label. */
2579 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2581 /* Create the label htab for the function on demand. */
2583 named_labels = htab_create_ggc (13, named_label_entry_hash,
2584 named_label_entry_eq, NULL);
2586 /* Record this label on the list of labels used in this function.
2587 We do this before calling make_label_decl so that we get the
2588 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2589 ent = ggc_alloc_cleared_named_label_entry ();
2590 ent->label_decl = decl;
2592 slot = htab_find_slot (named_labels, ent, INSERT);
2593 gcc_assert (*slot == NULL);
2599 /* Look for a label named ID in the current function. If one cannot
2600 be found, create one. (We keep track of used, but undefined,
2601 labels, and complain about them at the end of a function.) */
2604 lookup_label_1 (tree id)
2608 /* You can't use labels at global scope. */
2609 if (current_function_decl == NULL_TREE)
2611 error ("label %qE referenced outside of any function", id);
2615 /* See if we've already got this label. */
2616 decl = IDENTIFIER_LABEL_VALUE (id);
2617 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2620 decl = make_label_decl (id, /*local_p=*/0);
2624 /* Wrapper for lookup_label_1. */
2627 lookup_label (tree id)
2630 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2631 ret = lookup_label_1 (id);
2632 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2636 /* Declare a local label named ID. */
2639 declare_local_label (tree id)
2642 cp_label_binding *bind;
2644 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2645 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2646 bind = VEC_safe_push (cp_label_binding, gc,
2647 current_binding_level->shadowed_labels, NULL);
2648 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2650 decl = make_label_decl (id, /*local_p=*/1);
2656 /* Returns nonzero if it is ill-formed to jump past the declaration of
2657 DECL. Returns 2 if it's also a real problem. */
2660 decl_jump_unsafe (tree decl)
2662 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2663 with automatic storage duration is not in scope to a point where it is
2664 in scope is ill-formed unless the variable has scalar type, class type
2665 with a trivial default constructor and a trivial destructor, a
2666 cv-qualified version of one of these types, or an array of one of the
2667 preceding types and is declared without an initializer (8.5). */
2668 tree type = TREE_TYPE (decl);
2670 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2671 || type == error_mark_node)
2674 type = strip_array_types (type);
2676 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2677 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2680 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2686 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2689 identify_goto (tree decl, const location_t *locus)
2692 permerror (input_location, "jump to label %qD", decl);
2694 permerror (input_location, "jump to case label");
2696 permerror (*locus, " from here");
2699 /* Check that a single previously seen jump to a newly defined label
2700 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2701 the jump context; NAMES are the names in scope in LEVEL at the jump
2702 context; LOCUS is the source position of the jump or 0. Returns
2703 true if all is well. */
2706 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2707 bool exited_omp, const location_t *locus)
2709 cp_binding_level *b;
2710 bool identified = false, saw_eh = false, saw_omp = false;
2714 identify_goto (decl, locus);
2715 error (" exits OpenMP structured block");
2716 identified = saw_omp = true;
2719 for (b = current_binding_level; b ; b = b->level_chain)
2721 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2723 for (new_decls = b->names; new_decls != old_decls;
2724 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2725 : TREE_CHAIN (new_decls)))
2727 int problem = decl_jump_unsafe (new_decls);
2733 identify_goto (decl, locus);
2737 error (" crosses initialization of %q+#D", new_decls);
2739 permerror (input_location, " enters scope of %q+#D which has "
2740 "non-trivial destructor", new_decls);
2745 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2749 identify_goto (decl, locus);
2752 if (b->kind == sk_try)
2753 error (" enters try block");
2755 error (" enters catch block");
2758 if (b->kind == sk_omp && !saw_omp)
2762 identify_goto (decl, locus);
2765 error (" enters OpenMP structured block");
2774 check_previous_goto (tree decl, struct named_label_use_entry *use)
2776 check_previous_goto_1 (decl, use->binding_level,
2777 use->names_in_scope, use->in_omp_scope,
2778 &use->o_goto_locus);
2782 check_switch_goto (cp_binding_level* level)
2784 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2787 /* Check that a new jump to a label DECL is OK. Called by
2788 finish_goto_stmt. */
2791 check_goto (tree decl)
2793 struct named_label_entry *ent, dummy;
2794 bool saw_catch = false, identified = false;
2798 /* We can't know where a computed goto is jumping.
2799 So we assume that it's OK. */
2800 if (TREE_CODE (decl) != LABEL_DECL)
2803 /* We didn't record any information about this label when we created it,
2804 and there's not much point since it's trivial to analyze as a return. */
2805 if (decl == cdtor_label)
2808 dummy.label_decl = decl;
2809 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2810 gcc_assert (ent != NULL);
2812 /* If the label hasn't been defined yet, defer checking. */
2813 if (! DECL_INITIAL (decl))
2815 struct named_label_use_entry *new_use;
2817 /* Don't bother creating another use if the last goto had the
2818 same data, and will therefore create the same set of errors. */
2820 && ent->uses->names_in_scope == current_binding_level->names)
2823 new_use = ggc_alloc_named_label_use_entry ();
2824 new_use->binding_level = current_binding_level;
2825 new_use->names_in_scope = current_binding_level->names;
2826 new_use->o_goto_locus = input_location;
2827 new_use->in_omp_scope = false;
2829 new_use->next = ent->uses;
2830 ent->uses = new_use;
2834 if (ent->in_try_scope || ent->in_catch_scope
2835 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2837 permerror (input_location, "jump to label %q+D", decl);
2838 permerror (input_location, " from here");
2842 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2844 int u = decl_jump_unsafe (bad);
2846 if (u > 1 && DECL_ARTIFICIAL (bad))
2848 /* Can't skip init of __exception_info. */
2849 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2853 error (" skips initialization of %q+#D", bad);
2855 permerror (input_location, " enters scope of %q+#D which has "
2856 "non-trivial destructor", bad);
2859 if (ent->in_try_scope)
2860 error (" enters try block");
2861 else if (ent->in_catch_scope && !saw_catch)
2862 error (" enters catch block");
2864 if (ent->in_omp_scope)
2865 error (" enters OpenMP structured block");
2866 else if (flag_openmp)
2868 cp_binding_level *b;
2869 for (b = current_binding_level; b ; b = b->level_chain)
2871 if (b == ent->binding_level)
2873 if (b->kind == sk_omp)
2877 permerror (input_location, "jump to label %q+D", decl);
2878 permerror (input_location, " from here");
2881 error (" exits OpenMP structured block");
2888 /* Check that a return is ok wrt OpenMP structured blocks.
2889 Called by finish_return_stmt. Returns true if all is well. */
2892 check_omp_return (void)
2894 cp_binding_level *b;
2895 for (b = current_binding_level; b ; b = b->level_chain)
2896 if (b->kind == sk_omp)
2898 error ("invalid exit from OpenMP structured block");
2901 else if (b->kind == sk_function_parms)
2906 /* Define a label, specifying the location in the source file.
2907 Return the LABEL_DECL node for the label. */
2910 define_label_1 (location_t location, tree name)
2912 struct named_label_entry *ent, dummy;
2913 cp_binding_level *p;
2916 decl = lookup_label (name);
2918 dummy.label_decl = decl;
2919 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2920 gcc_assert (ent != NULL);
2922 /* After labels, make any new cleanups in the function go into their
2923 own new (temporary) binding contour. */
2924 for (p = current_binding_level;
2925 p->kind != sk_function_parms;
2927 p->more_cleanups_ok = 0;
2929 if (name == get_identifier ("wchar_t"))
2930 permerror (input_location, "label named wchar_t");
2932 if (DECL_INITIAL (decl) != NULL_TREE)
2934 error ("duplicate label %qD", decl);
2935 return error_mark_node;
2939 struct named_label_use_entry *use;
2941 /* Mark label as having been defined. */
2942 DECL_INITIAL (decl) = error_mark_node;
2943 /* Say where in the source. */
2944 DECL_SOURCE_LOCATION (decl) = location;
2946 ent->binding_level = current_binding_level;
2947 ent->names_in_scope = current_binding_level->names;
2949 for (use = ent->uses; use ; use = use->next)
2950 check_previous_goto (decl, use);
2957 /* Wrapper for define_label_1. */
2960 define_label (location_t location, tree name)
2963 bool running = timevar_cond_start (TV_NAME_LOOKUP);
2964 ret = define_label_1 (location, name);
2965 timevar_cond_stop (TV_NAME_LOOKUP, running);
2972 cp_binding_level *level;
2973 struct cp_switch *next;
2974 /* The SWITCH_STMT being built. */
2976 /* A splay-tree mapping the low element of a case range to the high
2977 element, or NULL_TREE if there is no high element. Used to
2978 determine whether or not a new case label duplicates an old case
2979 label. We need a tree, rather than simply a hash table, because
2980 of the GNU case range extension. */
2984 /* A stack of the currently active switch statements. The innermost
2985 switch statement is on the top of the stack. There is no need to
2986 mark the stack for garbage collection because it is only active
2987 during the processing of the body of a function, and we never
2988 collect at that point. */
2990 static struct cp_switch *switch_stack;
2992 /* Called right after a switch-statement condition is parsed.
2993 SWITCH_STMT is the switch statement being parsed. */
2996 push_switch (tree switch_stmt)
2998 struct cp_switch *p = XNEW (struct cp_switch);
2999 p->level = current_binding_level;
3000 p->next = switch_stack;
3001 p->switch_stmt = switch_stmt;
3002 p->cases = splay_tree_new (case_compare, NULL, NULL);
3009 struct cp_switch *cs = switch_stack;
3010 location_t switch_location;
3012 /* Emit warnings as needed. */
3013 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
3014 if (!processing_template_decl)
3015 c_do_switch_warnings (cs->cases, switch_location,
3016 SWITCH_STMT_TYPE (cs->switch_stmt),
3017 SWITCH_STMT_COND (cs->switch_stmt));
3019 splay_tree_delete (cs->cases);
3020 switch_stack = switch_stack->next;
3024 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3025 condition. Note that if TYPE and VALUE are already integral we don't
3026 really do the conversion because the language-independent
3027 warning/optimization code will work better that way. */
3030 case_conversion (tree type, tree value)
3032 if (value == NULL_TREE)
3035 if (cxx_dialect >= cxx0x
3036 && (SCOPED_ENUM_P (type)
3037 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3039 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3040 type = type_promotes_to (type);
3041 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3043 return cxx_constant_value (value);
3046 /* Note that we've seen a definition of a case label, and complain if this
3047 is a bad place for one. */
3050 finish_case_label (location_t loc, tree low_value, tree high_value)
3053 cp_binding_level *p;
3056 if (processing_template_decl)
3060 /* For templates, just add the case label; we'll do semantic
3061 analysis at instantiation-time. */
3062 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3063 return add_stmt (build_case_label (low_value, high_value, label));
3066 /* Find the condition on which this switch statement depends. */
3067 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3068 if (cond && TREE_CODE (cond) == TREE_LIST)
3069 cond = TREE_VALUE (cond);
3071 if (!check_switch_goto (switch_stack->level))
3072 return error_mark_node;
3074 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3076 low_value = case_conversion (type, low_value);
3077 high_value = case_conversion (type, high_value);
3079 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3080 low_value, high_value);
3082 /* After labels, make any new cleanups in the function go into their
3083 own new (temporary) binding contour. */
3084 for (p = current_binding_level;
3085 p->kind != sk_function_parms;
3087 p->more_cleanups_ok = 0;
3092 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3095 typename_hash (const void* k)
3098 const_tree const t = (const_tree) k;
3100 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3101 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3106 typedef struct typename_info {
3114 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3115 really of type `typename_info*' */
3118 typename_compare (const void * k1, const void * k2)
3120 const_tree const t1 = (const_tree) k1;
3121 const typename_info *const t2 = (const typename_info *) k2;
3123 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3124 && TYPE_CONTEXT (t1) == t2->scope
3125 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3126 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3127 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3130 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3131 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3133 Returns the new TYPENAME_TYPE. */
3135 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3138 build_typename_type (tree context, tree name, tree fullname,
3139 enum tag_types tag_type)
3147 if (typename_htab == NULL)
3148 typename_htab = htab_create_ggc (61, &typename_hash,
3149 &typename_compare, NULL);
3151 ti.scope = FROB_CONTEXT (context);
3153 ti.template_id = fullname;
3154 ti.enum_p = tag_type == enum_type;
3155 ti.class_p = (tag_type == class_type
3156 || tag_type == record_type
3157 || tag_type == union_type);
3158 hash = (htab_hash_pointer (ti.scope)
3159 ^ htab_hash_pointer (ti.name));
3161 /* See if we already have this type. */
3162 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3167 /* Build the TYPENAME_TYPE. */
3168 t = cxx_make_type (TYPENAME_TYPE);
3169 TYPE_CONTEXT (t) = ti.scope;
3170 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3171 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3172 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3174 /* Build the corresponding TYPE_DECL. */
3175 d = build_decl (input_location, TYPE_DECL, name, t);
3176 TYPE_NAME (TREE_TYPE (d)) = d;
3177 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3178 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3179 DECL_ARTIFICIAL (d) = 1;
3181 /* Store it in the hash table. */
3184 /* TYPENAME_TYPEs must always be compared structurally, because
3185 they may or may not resolve down to another type depending on
3186 the currently open classes. */
3187 SET_TYPE_STRUCTURAL_EQUALITY (t);
3193 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3194 provided to name the type. Returns an appropriate type, unless an
3195 error occurs, in which case error_mark_node is returned. If we
3196 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3197 return that, rather than the _TYPE it corresponds to, in other
3198 cases we look through the type decl. If TF_ERROR is set, complain
3199 about errors, otherwise be quiet. */
3202 make_typename_type (tree context, tree name, enum tag_types tag_type,
3203 tsubst_flags_t complain)
3209 if (name == error_mark_node
3210 || context == NULL_TREE
3211 || context == error_mark_node)
3212 return error_mark_node;
3216 if (!(TYPE_LANG_SPECIFIC (name)
3217 && (CLASSTYPE_IS_TEMPLATE (name)
3218 || CLASSTYPE_USE_TEMPLATE (name))))
3219 name = TYPE_IDENTIFIER (name);
3221 /* Create a TEMPLATE_ID_EXPR for the type. */
3222 name = build_nt (TEMPLATE_ID_EXPR,
3223 CLASSTYPE_TI_TEMPLATE (name),
3224 CLASSTYPE_TI_ARGS (name));
3226 else if (TREE_CODE (name) == TYPE_DECL)
3227 name = DECL_NAME (name);
3231 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3233 name = TREE_OPERAND (name, 0);
3234 if (TREE_CODE (name) == TEMPLATE_DECL)
3235 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3236 else if (TREE_CODE (name) == OVERLOAD)
3238 error ("%qD is not a type", name);
3239 return error_mark_node;
3242 if (TREE_CODE (name) == TEMPLATE_DECL)
3244 error ("%qD used without template parameters", name);
3245 return error_mark_node;
3247 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3248 gcc_assert (TYPE_P (context));
3250 if (!MAYBE_CLASS_TYPE_P (context))
3252 if (complain & tf_error)
3253 error ("%q#T is not a class", context);
3254 return error_mark_node;
3257 /* When the CONTEXT is a dependent type, NAME could refer to a
3258 dependent base class of CONTEXT. But look inside it anyway
3259 if CONTEXT is a currently open scope, in case it refers to a
3260 member of the current instantiation or a non-dependent base;
3261 lookup will stop when we hit a dependent base. */
3262 if (!dependent_scope_p (context))
3263 /* We should only set WANT_TYPE when we're a nested typename type.
3264 Then we can give better diagnostics if we find a non-type. */
3265 t = lookup_field (context, name, 2, /*want_type=*/true);
3269 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3270 return build_typename_type (context, name, fullname, tag_type);
3272 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3276 if (complain & tf_error)
3277 error (want_template ? G_("no class template named %q#T in %q#T")
3278 : G_("no type named %q#T in %q#T"), name, context);
3279 return error_mark_node;
3282 /* Pull out the template from an injected-class-name (or multiple). */
3284 t = maybe_get_template_decl_from_type_decl (t);
3286 if (TREE_CODE (t) == TREE_LIST)
3288 if (complain & tf_error)
3290 error ("lookup of %qT in %qT is ambiguous", name, context);
3291 print_candidates (t);
3293 return error_mark_node;
3296 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3298 if (complain & tf_error)
3299 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3301 return error_mark_node;
3303 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3305 if (complain & tf_error)
3306 error ("%<typename %T::%D%> names %q#T, which is not a type",
3308 return error_mark_node;
3311 if (!perform_or_defer_access_check (TYPE_BINFO (context), t, t, complain))
3312 return error_mark_node;
3314 /* If we are currently parsing a template and if T is a typedef accessed
3315 through CONTEXT then we need to remember and check access of T at
3316 template instantiation time. */
3317 add_typedef_to_current_template_for_access_check (t, context, input_location);
3320 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3322 /*entering_scope=*/0,
3323 tf_warning_or_error | tf_user);
3325 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3331 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3332 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3333 in which case error_mark_node is returned.
3335 If PARM_LIST is non-NULL, also make sure that the template parameter
3336 list of TEMPLATE_DECL matches.
3338 If COMPLAIN zero, don't complain about any errors that occur. */
3341 make_unbound_class_template (tree context, tree name, tree parm_list,
3342 tsubst_flags_t complain)
3348 name = TYPE_IDENTIFIER (name);
3349 else if (DECL_P (name))
3350 name = DECL_NAME (name);
3351 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3353 if (!dependent_type_p (context)
3354 || currently_open_class (context))
3356 tree tmpl = NULL_TREE;
3358 if (MAYBE_CLASS_TYPE_P (context))
3359 tmpl = lookup_field (context, name, 0, false);
3361 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3362 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3364 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3366 if (complain & tf_error)
3367 error ("no class template named %q#T in %q#T", name, context);
3368 return error_mark_node;
3372 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3374 if (complain & tf_error)
3376 error ("template parameters do not match template");
3377 error ("%q+D declared here", tmpl);
3379 return error_mark_node;
3382 if (!perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl,
3384 return error_mark_node;
3389 /* Build the UNBOUND_CLASS_TEMPLATE. */
3390 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3391 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3392 TREE_TYPE (t) = NULL_TREE;
3393 SET_TYPE_STRUCTURAL_EQUALITY (t);
3395 /* Build the corresponding TEMPLATE_DECL. */
3396 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3397 TYPE_NAME (TREE_TYPE (d)) = d;
3398 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3399 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3400 DECL_ARTIFICIAL (d) = 1;
3401 DECL_TEMPLATE_PARMS (d) = parm_list;
3408 /* Push the declarations of builtin types into the namespace.
3409 RID_INDEX is the index of the builtin type in the array
3410 RID_POINTERS. NAME is the name used when looking up the builtin
3411 type. TYPE is the _TYPE node for the builtin type. */
3414 record_builtin_type (enum rid rid_index,
3418 tree rname = NULL_TREE, tname = NULL_TREE;
3419 tree tdecl = NULL_TREE;
3421 if ((int) rid_index < (int) RID_MAX)
3422 rname = ridpointers[(int) rid_index];
3424 tname = get_identifier (name);
3426 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3427 eliminated. Built-in types should not be looked up name; their
3428 names are keywords that the parser can recognize. However, there
3429 is code in c-common.c that uses identifier_global_value to look
3430 up built-in types by name. */
3433 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3434 DECL_ARTIFICIAL (tdecl) = 1;
3435 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3441 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3442 DECL_ARTIFICIAL (tdecl) = 1;
3444 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3447 if (!TYPE_NAME (type))
3448 TYPE_NAME (type) = tdecl;
3451 debug_hooks->type_decl (tdecl, 0);
3454 /* Record one of the standard Java types.
3455 * Declare it as having the given NAME.
3456 * If SIZE > 0, it is the size of one of the integral types;
3457 * otherwise it is the negative of the size of one of the other types. */
3460 record_builtin_java_type (const char* name, int size)
3465 type = build_nonstandard_integer_type (size, 0);
3466 type = build_distinct_type_copy (type);
3468 else if (size > -32)
3471 /* "__java_char" or ""__java_boolean". */
3472 type = build_nonstandard_integer_type (-size, 1);
3473 type = build_distinct_type_copy (type);
3474 /* Get the signed type cached and attached to the unsigned type,
3475 so it doesn't get garbage-collected at "random" times,
3476 causing potential codegen differences out of different UIDs
3477 and different alias set numbers. */
3478 stype = build_nonstandard_integer_type (-size, 0);
3479 stype = build_distinct_type_copy (stype);
3480 TREE_CHAIN (type) = stype;
3481 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3484 { /* "__java_float" or ""__java_double". */
3485 type = make_node (REAL_TYPE);
3486 TYPE_PRECISION (type) = - size;
3489 record_builtin_type (RID_MAX, name, type);
3490 decl = TYPE_NAME (type);
3492 /* Suppress generate debug symbol entries for these types,
3493 since for normal C++ they are just clutter.
3494 However, push_lang_context undoes this if extern "Java" is seen. */
3495 DECL_IGNORED_P (decl) = 1;
3497 TYPE_FOR_JAVA (type) = 1;
3501 /* Push a type into the namespace so that the back ends ignore it. */
3504 record_unknown_type (tree type, const char* name)
3506 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3507 TYPE_DECL, get_identifier (name), type));
3508 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3509 DECL_IGNORED_P (decl) = 1;
3510 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3511 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3512 TYPE_ALIGN (type) = 1;
3513 TYPE_USER_ALIGN (type) = 0;
3514 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3517 /* A string for which we should create an IDENTIFIER_NODE at
3520 typedef struct predefined_identifier
3522 /* The name of the identifier. */
3523 const char *const name;
3524 /* The place where the IDENTIFIER_NODE should be stored. */
3526 /* Nonzero if this is the name of a constructor or destructor. */
3527 const int ctor_or_dtor_p;
3528 } predefined_identifier;
3530 /* Create all the predefined identifiers. */
3533 initialize_predefined_identifiers (void)
3535 const predefined_identifier *pid;
3537 /* A table of identifiers to create at startup. */
3538 static const predefined_identifier predefined_identifiers[] = {
3539 { "C++", &lang_name_cplusplus, 0 },
3540 { "C", &lang_name_c, 0 },
3541 { "Java", &lang_name_java, 0 },
3542 /* Some of these names have a trailing space so that it is
3543 impossible for them to conflict with names written by users. */
3544 { "__ct ", &ctor_identifier, 1 },
3545 { "__base_ctor ", &base_ctor_identifier, 1 },
3546 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3547 { "__dt ", &dtor_identifier, 1 },
3548 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3549 { "__base_dtor ", &base_dtor_identifier, 1 },
3550 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3551 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3552 { "nelts", &nelts_identifier, 0 },
3553 { THIS_NAME, &this_identifier, 0 },
3554 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3555 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3556 { "_vptr", &vptr_identifier, 0 },
3557 { "__vtt_parm", &vtt_parm_identifier, 0 },
3558 { "::", &global_scope_name, 0 },
3559 { "std", &std_identifier, 0 },
3563 for (pid = predefined_identifiers; pid->name; ++pid)
3565 *pid->node = get_identifier (pid->name);
3566 if (pid->ctor_or_dtor_p)
3567 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3571 /* Create the predefined scalar types of C,
3572 and some nodes representing standard constants (0, 1, (void *)0).
3573 Initialize the global binding level.
3574 Make definitions for built-in primitive functions. */
3577 cxx_init_decl_processing (void)
3580 tree void_ftype_ptr;
3582 /* Create all the identifiers we need. */
3583 initialize_predefined_identifiers ();
3585 /* Create the global variables. */
3586 push_to_top_level ();
3588 current_function_decl = NULL_TREE;
3589 current_binding_level = NULL;
3590 /* Enter the global namespace. */
3591 gcc_assert (global_namespace == NULL_TREE);
3592 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3594 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3595 TREE_PUBLIC (global_namespace) = 1;
3596 begin_scope (sk_namespace, global_namespace);
3598 if (flag_visibility_ms_compat)
3599 default_visibility = VISIBILITY_HIDDEN;
3602 current_lang_name = lang_name_c;
3604 /* Create the `std' namespace. */
3605 push_namespace (std_identifier);
3606 std_node = current_namespace;
3609 c_common_nodes_and_builtins ();
3611 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3612 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3613 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3614 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3615 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3616 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3617 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3618 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3620 integer_two_node = build_int_cst (NULL_TREE, 2);
3622 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3623 truthvalue_type_node = boolean_type_node;
3624 truthvalue_false_node = boolean_false_node;
3625 truthvalue_true_node = boolean_true_node;
3627 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3628 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3629 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3632 record_builtin_type (RID_MAX, NULL, string_type_node);
3635 delta_type_node = ptrdiff_type_node;
3636 vtable_index_type = ptrdiff_type_node;
3638 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3639 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3640 void_ftype_ptr = build_function_type_list (void_type_node,
3641 ptr_type_node, NULL_TREE);
3643 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3645 /* C++ extensions */
3647 unknown_type_node = make_node (LANG_TYPE);
3648 record_unknown_type (unknown_type_node, "unknown type");
3650 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3651 TREE_TYPE (unknown_type_node) = unknown_type_node;
3653 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3655 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3656 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3658 init_list_type_node = make_node (LANG_TYPE);
3659 record_unknown_type (init_list_type_node, "init list");
3662 /* Make sure we get a unique function type, so we can give
3663 its pointer type a name. (This wins for gdb.) */
3664 tree vfunc_type = make_node (FUNCTION_TYPE);
3665 TREE_TYPE (vfunc_type) = integer_type_node;
3666 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3667 layout_type (vfunc_type);
3669 vtable_entry_type = build_pointer_type (vfunc_type);
3671 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3674 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3675 layout_type (vtbl_type_node);
3676 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3677 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3678 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3679 layout_type (vtbl_ptr_type_node);
3680 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3682 push_namespace (get_identifier ("__cxxabiv1"));
3683 abi_node = current_namespace;
3686 global_type_node = make_node (LANG_TYPE);
3687 record_unknown_type (global_type_node, "global type");
3690 current_lang_name = lang_name_cplusplus;
3693 tree newattrs, extvisattr;
3694 tree newtype, deltype;
3695 tree ptr_ftype_sizetype;
3699 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3700 if (cxx_dialect == cxx98)
3703 tree bad_alloc_type_node;
3704 tree bad_alloc_decl;
3706 push_namespace (std_identifier);
3707 bad_alloc_id = get_identifier ("bad_alloc");
3708 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3709 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3711 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3712 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3716 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3719 new_eh_spec = noexcept_false_spec;
3721 /* Ensure attribs.c is initialized. */
3723 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3725 newattrs = tree_cons (get_identifier ("alloc_size"),
3726 build_tree_list (NULL_TREE, integer_one_node),
3728 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3729 newtype = build_exception_variant (newtype, new_eh_spec);
3730 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3731 deltype = build_exception_variant (deltype, empty_except_spec);
3732 push_cp_library_fn (NEW_EXPR, newtype);
3733 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3734 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3735 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3737 nullptr_type_node = make_node (NULLPTR_TYPE);
3738 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3739 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3740 TYPE_UNSIGNED (nullptr_type_node) = 1;
3741 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3742 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3743 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3744 nullptr_node = build_int_cst (nullptr_type_node, 0);
3748 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3750 /* Perform other language dependent initializations. */
3751 init_class_processing ();
3752 init_rtti_processing ();
3753 init_template_processing ();
3755 if (flag_exceptions)
3756 init_exception_processing ();
3758 if (! supports_one_only ())
3761 make_fname_decl = cp_make_fname_decl;
3762 start_fname_decls ();
3764 /* Show we use EH for cleanups. */
3765 if (flag_exceptions)
3766 using_eh_for_cleanups ();
3769 /* Generate an initializer for a function naming variable from
3770 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3771 filled in with the type of the init. */
3774 cp_fname_init (const char* name, tree *type_p)
3776 tree domain = NULL_TREE;
3778 tree init = NULL_TREE;
3783 length = strlen (name);
3784 domain = build_index_type (size_int (length));
3785 init = build_string (length + 1, name);
3788 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3789 type = build_cplus_array_type (type, domain);
3794 TREE_TYPE (init) = type;
3796 init = error_mark_node;
3801 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3802 the decl, LOC is the location to give the decl, NAME is the
3803 initialization string and TYPE_DEP indicates whether NAME depended
3804 on the type of the function. We make use of that to detect
3805 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3806 at the point of first use, so we mustn't push the decl now. */
3809 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3811 const char *const name = (type_dep && processing_template_decl
3812 ? NULL : fname_as_string (type_dep));
3814 tree init = cp_fname_init (name, &type);
3815 tree decl = build_decl (loc, VAR_DECL, id, type);
3818 free (CONST_CAST (char *, name));
3820 /* As we're using pushdecl_with_scope, we must set the context. */
3821 DECL_CONTEXT (decl) = current_function_decl;
3822 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3824 TREE_STATIC (decl) = 1;
3825 TREE_READONLY (decl) = 1;
3826 DECL_ARTIFICIAL (decl) = 1;
3828 TREE_USED (decl) = 1;
3830 if (current_function_decl)
3832 cp_binding_level *b = current_binding_level;
3833 if (b->kind == sk_function_parms)
3834 return error_mark_node;
3835 while (b->level_chain->kind != sk_function_parms)
3837 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3838 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3839 LOOKUP_ONLYCONVERTING);
3843 DECL_THIS_STATIC (decl) = true;
3844 pushdecl_top_level_and_finish (decl, init);
3851 builtin_function_1 (tree decl, tree context, bool is_global)
3853 tree id = DECL_NAME (decl);
3854 const char *name = IDENTIFIER_POINTER (id);
3856 retrofit_lang_decl (decl);
3858 DECL_ARTIFICIAL (decl) = 1;
3859 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3860 SET_DECL_LANGUAGE (decl, lang_c);
3861 /* Runtime library routines are, by definition, available in an
3862 external shared object. */
3863 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3864 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3866 DECL_CONTEXT (decl) = context;
3869 pushdecl_top_level (decl);
3873 /* A function in the user's namespace should have an explicit
3874 declaration before it is used. Mark the built-in function as
3875 anticipated but not actually declared. */
3876 if (name[0] != '_' || name[1] != '_')
3877 DECL_ANTICIPATED (decl) = 1;
3878 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3880 size_t len = strlen (name);
3882 /* Treat __*_chk fortification functions as anticipated as well,
3883 unless they are __builtin_*. */
3884 if (len > strlen ("___chk")
3885 && memcmp (name + len - strlen ("_chk"),
3886 "_chk", strlen ("_chk") + 1) == 0)
3887 DECL_ANTICIPATED (decl) = 1;
3894 cxx_builtin_function (tree decl)
3896 tree id = DECL_NAME (decl);
3897 const char *name = IDENTIFIER_POINTER (id);
3898 /* All builtins that don't begin with an '_' should additionally
3899 go in the 'std' namespace. */
3902 tree decl2 = copy_node(decl);
3903 push_namespace (std_identifier);
3904 builtin_function_1 (decl2, std_node, false);
3908 return builtin_function_1 (decl, NULL_TREE, false);
3911 /* Like cxx_builtin_function, but guarantee the function is added to the global
3912 scope. This is to allow function specific options to add new machine
3913 dependent builtins when the target ISA changes via attribute((target(...)))
3914 which saves space on program startup if the program does not use non-generic
3918 cxx_builtin_function_ext_scope (tree decl)
3921 tree id = DECL_NAME (decl);
3922 const char *name = IDENTIFIER_POINTER (id);
3923 /* All builtins that don't begin with an '_' should additionally
3924 go in the 'std' namespace. */
3927 tree decl2 = copy_node(decl);
3928 push_namespace (std_identifier);
3929 builtin_function_1 (decl2, std_node, true);
3933 return builtin_function_1 (decl, NULL_TREE, true);
3936 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3937 function. Not called directly. */
3940 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3942 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3943 DECL_EXTERNAL (fn) = 1;
3944 TREE_PUBLIC (fn) = 1;
3945 DECL_ARTIFICIAL (fn) = 1;
3946 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3947 SET_DECL_LANGUAGE (fn, lang_c);
3948 /* Runtime library routines are, by definition, available in an
3949 external shared object. */
3950 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3951 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3955 /* Returns the _DECL for a library function with C linkage.
3956 We assume that such functions never throw; if this is incorrect,
3957 callers should unset TREE_NOTHROW. */
3960 build_library_fn (tree name, tree type)
3962 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3963 TREE_NOTHROW (fn) = 1;
3967 /* Returns the _DECL for a library function with C++ linkage. */
3970 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3972 tree fn = build_library_fn_1 (name, operator_code, type);
3973 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3974 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3975 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3979 /* Like build_library_fn, but takes a C string instead of an
3983 build_library_fn_ptr (const char* name, tree type)
3985 return build_library_fn (get_identifier (name), type);
3988 /* Like build_cp_library_fn, but takes a C string instead of an
3992 build_cp_library_fn_ptr (const char* name, tree type)
3994 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3997 /* Like build_library_fn, but also pushes the function so that we will
3998 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3999 may throw exceptions listed in RAISES. */
4002 push_library_fn (tree name, tree type, tree raises)
4007 type = build_exception_variant (type, raises);
4009 fn = build_library_fn (name, type);
4010 pushdecl_top_level (fn);
4014 /* Like build_cp_library_fn, but also pushes the function so that it
4015 will be found by normal lookup. */
4018 push_cp_library_fn (enum tree_code operator_code, tree type)
4020 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4025 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4029 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4033 push_void_library_fn (tree name, tree parmtypes)
4035 tree type = build_function_type (void_type_node, parmtypes);
4036 return push_library_fn (name, type, NULL_TREE);
4039 /* Like push_library_fn, but also note that this function throws
4040 and does not return. Used for __throw_foo and the like. */
4043 push_throw_library_fn (tree name, tree type)
4045 tree fn = push_library_fn (name, type, NULL_TREE);
4046 TREE_THIS_VOLATILE (fn) = 1;
4047 TREE_NOTHROW (fn) = 0;
4051 /* When we call finish_struct for an anonymous union, we create
4052 default copy constructors and such. But, an anonymous union
4053 shouldn't have such things; this function undoes the damage to the
4054 anonymous union type T.
4056 (The reason that we create the synthesized methods is that we don't
4057 distinguish `union { int i; }' from `typedef union { int i; } U'.
4058 The first is an anonymous union; the second is just an ordinary
4062 fixup_anonymous_aggr (tree t)
4066 /* Wipe out memory of synthesized methods. */
4067 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4068 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4069 TYPE_HAS_COPY_CTOR (t) = 0;
4070 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4071 TYPE_HAS_COPY_ASSIGN (t) = 0;
4072 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4074 /* Splice the implicitly generated functions out of the TYPE_METHODS
4076 q = &TYPE_METHODS (t);
4079 if (DECL_ARTIFICIAL (*q))
4080 *q = TREE_CHAIN (*q);
4082 q = &DECL_CHAIN (*q);
4085 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4086 if (TYPE_METHODS (t))
4088 tree decl = TYPE_MAIN_DECL (t);
4090 if (TREE_CODE (t) != UNION_TYPE)
4091 error_at (DECL_SOURCE_LOCATION (decl),
4092 "an anonymous struct cannot have function members");
4094 error_at (DECL_SOURCE_LOCATION (decl),
4095 "an anonymous union cannot have function members");
4098 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4099 assignment operators (because they cannot have these methods themselves).
4100 For anonymous unions this is already checked because they are not allowed
4101 in any union, otherwise we have to check it. */
4102 if (TREE_CODE (t) != UNION_TYPE)
4106 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4107 if (TREE_CODE (field) == FIELD_DECL)
4109 type = TREE_TYPE (field);
4110 if (CLASS_TYPE_P (type))
4112 if (TYPE_NEEDS_CONSTRUCTING (type))
4113 error ("member %q+#D with constructor not allowed "
4114 "in anonymous aggregate", field);
4115 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4116 error ("member %q+#D with destructor not allowed "
4117 "in anonymous aggregate", field);
4118 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4119 error ("member %q+#D with copy assignment operator "
4120 "not allowed in anonymous aggregate", field);
4126 /* Make sure that a declaration with no declarator is well-formed, i.e.
4127 just declares a tagged type or anonymous union.
4129 Returns the type declared; or NULL_TREE if none. */
4132 check_tag_decl (cp_decl_specifier_seq *declspecs)
4134 int saw_friend = decl_spec_seq_has_spec_p (declspecs, ds_friend);
4135 int saw_typedef = decl_spec_seq_has_spec_p (declspecs, ds_typedef);
4136 /* If a class, struct, or enum type is declared by the DECLSPECS
4137 (i.e, if a class-specifier, enum-specifier, or non-typename
4138 elaborated-type-specifier appears in the DECLSPECS),
4139 DECLARED_TYPE is set to the corresponding type. */
4140 tree declared_type = NULL_TREE;
4141 bool error_p = false;
4143 if (declspecs->multiple_types_p)
4144 error ("multiple types in one declaration");
4145 else if (declspecs->redefined_builtin_type)
4147 if (!in_system_header)
4148 permerror (declspecs->locations[ds_redefined_builtin_type_spec],
4149 "redeclaration of C++ built-in type %qT",
4150 declspecs->redefined_builtin_type);
4155 && TYPE_P (declspecs->type)
4156 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4157 && MAYBE_CLASS_TYPE_P (declspecs->type))
4158 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4159 declared_type = declspecs->type;
4160 else if (declspecs->type == error_mark_node)
4162 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4163 permerror (input_location, "declaration does not declare anything");
4164 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4166 error ("%<auto%> can only be specified for variables "
4167 "or function declarations");
4168 return error_mark_node;
4170 /* Check for an anonymous union. */
4171 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4172 && TYPE_ANONYMOUS_P (declared_type))
4174 /* 7/3 In a simple-declaration, the optional init-declarator-list
4175 can be omitted only when declaring a class (clause 9) or
4176 enumeration (7.2), that is, when the decl-specifier-seq contains
4177 either a class-specifier, an elaborated-type-specifier with
4178 a class-key (9.1), or an enum-specifier. In these cases and
4179 whenever a class-specifier or enum-specifier is present in the
4180 decl-specifier-seq, the identifiers in these specifiers are among
4181 the names being declared by the declaration (as class-name,
4182 enum-names, or enumerators, depending on the syntax). In such
4183 cases, and except for the declaration of an unnamed bit-field (9.6),
4184 the decl-specifier-seq shall introduce one or more names into the
4185 program, or shall redeclare a name introduced by a previous
4186 declaration. [Example:
4187 enum { }; // ill-formed
4188 typedef class { }; // ill-formed
4192 error ("missing type-name in typedef-declaration");
4195 /* Anonymous unions are objects, so they can have specifiers. */;
4196 SET_ANON_AGGR_TYPE_P (declared_type);
4198 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4199 pedwarn (input_location, OPT_Wpedantic, "ISO C++ prohibits anonymous structs");
4204 if (decl_spec_seq_has_spec_p (declspecs, ds_inline)
4205 || decl_spec_seq_has_spec_p (declspecs, ds_virtual))
4206 error ("%qs can only be specified for functions",
4207 decl_spec_seq_has_spec_p (declspecs, ds_inline)
4208 ? "inline" : "virtual");
4210 && (!current_class_type
4211 || current_scope () != current_class_type))
4212 error ("%<friend%> can only be specified inside a class");
4213 else if (decl_spec_seq_has_spec_p (declspecs, ds_explicit))
4214 error ("%<explicit%> can only be specified for constructors");
4215 else if (declspecs->storage_class)
4216 error ("a storage class can only be specified for objects "
4218 else if (decl_spec_seq_has_spec_p (declspecs, ds_const)
4219 || decl_spec_seq_has_spec_p (declspecs, ds_volatile)
4220 || decl_spec_seq_has_spec_p (declspecs, ds_restrict)
4221 || decl_spec_seq_has_spec_p (declspecs, ds_thread))
4222 error ("qualifiers can only be specified for objects "
4224 else if (saw_typedef)
4225 warning (0, "%<typedef%> was ignored in this declaration");
4226 else if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr))
4227 error ("%<constexpr%> cannot be used for type declarations");
4230 if (declspecs->attributes && warn_attributes && declared_type)
4233 if (!CLASS_TYPE_P (declared_type)
4234 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4235 /* For a non-template class, use the name location. */
4236 loc = location_of (declared_type);
4238 /* For a template class (an explicit instantiation), use the
4239 current location. */
4240 loc = input_location;
4241 warning_at (loc, OPT_Wattributes, "attribute ignored in declaration "
4242 "of %q#T", declared_type);
4243 inform (loc, "attribute for %q#T must follow the %qs keyword",
4244 declared_type, class_key_or_enum_as_string (declared_type));
4247 return declared_type;
4250 /* Called when a declaration is seen that contains no names to declare.
4251 If its type is a reference to a structure, union or enum inherited
4252 from a containing scope, shadow that tag name for the current scope
4253 with a forward reference.
4254 If its type defines a new named structure or union
4255 or defines an enum, it is valid but we need not do anything here.
4256 Otherwise, it is an error.
4258 C++: may have to grok the declspecs to learn about static,
4259 complain for anonymous unions.
4261 Returns the TYPE declared -- or NULL_TREE if none. */
4264 shadow_tag (cp_decl_specifier_seq *declspecs)
4266 tree t = check_tag_decl (declspecs);
4271 if (maybe_process_partial_specialization (t) == error_mark_node)
4274 /* This is where the variables in an anonymous union are
4275 declared. An anonymous union declaration looks like:
4277 because there is no declarator after the union, the parser
4278 sends that declaration here. */
4279 if (ANON_AGGR_TYPE_P (t))
4281 fixup_anonymous_aggr (t);
4283 if (TYPE_FIELDS (t))
4285 tree decl = grokdeclarator (/*declarator=*/NULL,
4286 declspecs, NORMAL, 0, NULL);
4287 finish_anon_union (decl);
4294 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4297 groktypename (cp_decl_specifier_seq *type_specifiers,
4298 const cp_declarator *declarator,
4299 bool is_template_arg)
4303 enum decl_context context
4304 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4305 attrs = type_specifiers->attributes;
4306 type_specifiers->attributes = NULL_TREE;
4307 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4308 if (attrs && type != error_mark_node)
4310 if (CLASS_TYPE_P (type))
4311 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4312 "outside of definition", type);
4313 else if (MAYBE_CLASS_TYPE_P (type))
4314 /* A template type parameter or other dependent type. */
4315 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4316 "type %qT without an associated declaration", type);
4318 cplus_decl_attributes (&type, attrs, 0);
4323 /* Process a DECLARATOR for a function-scope variable declaration,
4324 namespace-scope variable declaration, or function declaration.
4325 (Function definitions go through start_function; class member
4326 declarations appearing in the body of the class go through
4327 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4328 If an error occurs, the error_mark_node is returned instead.
4330 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4331 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4332 for an explicitly defaulted function, or SD_DELETED for an explicitly
4333 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4334 implicitly initialized via a default constructor. ATTRIBUTES and
4335 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4337 The scope represented by the context of the returned DECL is pushed
4338 (if it is not the global namespace) and is assigned to
4339 *PUSHED_SCOPE_P. The caller is then responsible for calling
4340 pop_scope on *PUSHED_SCOPE_P if it is set. */
4343 start_decl (const cp_declarator *declarator,
4344 cp_decl_specifier_seq *declspecs,
4347 tree prefix_attributes,
4348 tree *pushed_scope_p)
4356 *pushed_scope_p = NULL_TREE;
4358 /* An object declared as __attribute__((deprecated)) suppresses
4359 warnings of uses of other deprecated items. */
4360 if (lookup_attribute ("deprecated", attributes))
4361 deprecated_state = DEPRECATED_SUPPRESS;
4363 attributes = chainon (attributes, prefix_attributes);
4365 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4368 deprecated_state = DEPRECATED_NORMAL;
4370 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4371 || decl == error_mark_node)
4372 return error_mark_node;
4374 context = CP_DECL_CONTEXT (decl);
4375 if (context != global_namespace)
4376 *pushed_scope_p = push_scope (context);
4379 /* Is it valid for this decl to have an initializer at all?
4380 If not, set INITIALIZED to zero, which will indirectly
4381 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4382 switch (TREE_CODE (decl))
4385 error ("typedef %qD is initialized (use decltype instead)", decl);
4386 return error_mark_node;
4389 if (initialized == SD_DELETED)
4390 /* We'll handle the rest of the semantics later, but we need to
4391 set this now so it's visible to duplicate_decls. */
4392 DECL_DELETED_FN (decl) = 1;
4401 if (! toplevel_bindings_p ()
4402 && DECL_EXTERNAL (decl))
4403 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4405 DECL_EXTERNAL (decl) = 0;
4406 if (toplevel_bindings_p ())
4407 TREE_STATIC (decl) = 1;
4409 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4411 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4412 record_key_method_defined (decl);
4414 /* If this is a typedef that names the class for linkage purposes
4415 (7.1.3p8), apply any attributes directly to the type. */
4416 if (TREE_CODE (decl) == TYPE_DECL
4417 && TAGGED_TYPE_P (TREE_TYPE (decl))
4418 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4419 flags = ATTR_FLAG_TYPE_IN_PLACE;
4423 /* Set attributes here so if duplicate decl, will have proper attributes. */
4424 cplus_decl_attributes (&decl, attributes, flags);
4426 /* Dllimported symbols cannot be defined. Static data members (which
4427 can be initialized in-class and dllimported) go through grokfield,
4428 not here, so we don't need to exclude those decls when checking for
4430 if (initialized && DECL_DLLIMPORT_P (decl))
4432 error ("definition of %q#D is marked %<dllimport%>", decl);
4433 DECL_DLLIMPORT_P (decl) = 0;
4436 /* If #pragma weak was used, mark the decl weak now. */
4437 if (!processing_template_decl)
4438 maybe_apply_pragma_weak (decl);
4440 if (TREE_CODE (decl) == FUNCTION_DECL
4441 && DECL_DECLARED_INLINE_P (decl)
4442 && DECL_UNINLINABLE (decl)
4443 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4444 warning (0, "inline function %q+D given attribute noinline", decl);
4446 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4448 if (TREE_CODE (decl) == VAR_DECL)
4450 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4451 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4452 error ("%q#D is not a static member of %q#T", decl, context);
4455 if (DECL_CONTEXT (field) != context)
4457 if (!same_type_p (DECL_CONTEXT (field), context))
4458 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4459 "to be defined as %<%T::%D%>",
4460 DECL_CONTEXT (field), DECL_NAME (decl),
4461 context, DECL_NAME (decl));
4462 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4464 /* Static data member are tricky; an in-class initialization
4465 still doesn't provide a definition, so the in-class
4466 declaration will have DECL_EXTERNAL set, but will have an
4467 initialization. Thus, duplicate_decls won't warn
4468 about this situation, and so we check here. */
4469 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4470 error ("duplicate initialization of %qD", decl);
4471 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4473 if (decl_spec_seq_has_spec_p (declspecs, ds_constexpr)
4474 && !DECL_DECLARED_CONSTEXPR_P (field))
4475 error ("%qD declared %<constexpr%> outside its class", field);
4480 tree field = check_classfn (context, decl,
4481 (processing_template_decl
4482 > template_class_depth (context))
4483 ? current_template_parms
4485 if (field && field != error_mark_node
4486 && duplicate_decls (decl, field,
4487 /*newdecl_is_friend=*/false))
4491 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4492 DECL_IN_AGGR_P (decl) = 0;
4493 /* Do not mark DECL as an explicit specialization if it was not
4494 already marked as an instantiation; a declaration should
4495 never be marked as a specialization unless we know what
4496 template is being specialized. */
4497 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4499 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4501 /* [temp.expl.spec] An explicit specialization of a static data
4502 member of a template is a definition if the declaration
4503 includes an initializer; otherwise, it is a declaration.
4505 We check for processing_specialization so this only applies
4506 to the new specialization syntax. */
4507 if (!initialized && processing_specialization)
4508 DECL_EXTERNAL (decl) = 1;
4511 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4512 /* Aliases are definitions. */
4514 permerror (input_location, "declaration of %q#D outside of class is not definition",
4518 was_public = TREE_PUBLIC (decl);
4520 /* Enter this declaration into the symbol table. */
4521 decl = maybe_push_decl (decl);
4523 if (processing_template_decl)
4524 decl = push_template_decl (decl);
4525 if (decl == error_mark_node)
4526 return error_mark_node;
4528 if (TREE_CODE (decl) == VAR_DECL
4529 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4530 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4532 /* This is a const variable with implicit 'static'. Set
4533 DECL_THIS_STATIC so we can tell it from variables that are
4534 !TREE_PUBLIC because of the anonymous namespace. */
4535 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4536 DECL_THIS_STATIC (decl) = 1;
4539 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4540 start_decl_1 (decl, initialized);
4545 /* Process the declaration of a variable DECL. INITIALIZED is true
4546 iff DECL is explicitly initialized. (INITIALIZED is false if the
4547 variable is initialized via an implicitly-called constructor.)
4548 This function must be called for ordinary variables (including, for
4549 example, implicit instantiations of templates), but must not be
4550 called for template declarations. */
4553 start_decl_1 (tree decl, bool initialized)
4557 bool aggregate_definition_p;
4559 gcc_assert (!processing_template_decl);
4561 if (error_operand_p (decl))
4564 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4566 type = TREE_TYPE (decl);
4567 complete_p = COMPLETE_TYPE_P (type);
4568 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4570 /* If an explicit initializer is present, or if this is a definition
4571 of an aggregate, then we need a complete type at this point.
4572 (Scalars are always complete types, so there is nothing to
4573 check.) This code just sets COMPLETE_P; errors (if necessary)
4574 are issued below. */
4575 if ((initialized || aggregate_definition_p)
4577 && COMPLETE_TYPE_P (complete_type (type)))
4580 /* We will not yet have set TREE_READONLY on DECL if the type
4581 was "const", but incomplete, before this point. But, now, we
4582 have a complete type, so we can try again. */
4583 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4587 /* Is it valid for this decl to have an initializer at all? */
4589 /* Don't allow initializations for incomplete types except for
4590 arrays which might be completed by the initialization. */
4592 ; /* A complete type is ok. */
4593 else if (type_uses_auto (type))
4594 ; /* An auto type is ok. */
4595 else if (TREE_CODE (type) != ARRAY_TYPE)
4597 error ("variable %q#D has initializer but incomplete type", decl);
4598 type = TREE_TYPE (decl) = error_mark_node;
4600 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4602 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4603 error ("elements of array %q#D have incomplete type", decl);
4604 /* else we already gave an error in start_decl. */
4607 else if (aggregate_definition_p && !complete_p)
4609 if (type_uses_auto (type))
4610 error ("declaration of %q#D has no initializer", decl);
4612 error ("aggregate %q#D has incomplete type and cannot be defined",
4614 /* Change the type so that assemble_variable will give
4615 DECL an rtl we can live with: (mem (const_int 0)). */
4616 type = TREE_TYPE (decl) = error_mark_node;
4619 /* Create a new scope to hold this declaration if necessary.
4620 Whether or not a new scope is necessary cannot be determined
4621 until after the type has been completed; if the type is a
4622 specialization of a class template it is not until after
4623 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4624 will be set correctly. */
4625 maybe_push_cleanup_level (type);
4628 /* Handle initialization of references. DECL, TYPE, and INIT have the
4629 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4630 but will be set to a new CLEANUP_STMT if a temporary is created
4631 that must be destroyed subsequently.
4633 Returns an initializer expression to use to initialize DECL, or
4634 NULL if the initialization can be performed statically.
4636 Quotes on semantics can be found in ARM 8.4.3. */
4639 grok_reference_init (tree decl, tree type, tree init, int flags)
4641 if (init == NULL_TREE)
4643 if ((DECL_LANG_SPECIFIC (decl) == 0
4644 || DECL_IN_AGGR_P (decl) == 0)
4645 && ! DECL_THIS_EXTERN (decl))
4646 error ("%qD declared as reference but not initialized", decl);
4650 if (TREE_CODE (init) == TREE_LIST)
4651 init = build_x_compound_expr_from_list (init, ELK_INIT,
4652 tf_warning_or_error);
4654 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4655 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4656 /* Note: default conversion is only called in very special cases. */
4657 init = decay_conversion (init, tf_warning_or_error);
4659 /* Convert INIT to the reference type TYPE. This may involve the
4660 creation of a temporary, whose lifetime must be the same as that
4661 of the reference. If so, a DECL_EXPR for the temporary will be
4662 added just after the DECL_EXPR for DECL. That's why we don't set
4663 DECL_INITIAL for local references (instead assigning to them
4664 explicitly); we need to allow the temporary to be initialized
4666 return initialize_reference (type, init, flags,
4667 tf_warning_or_error);
4670 /* Designated initializers in arrays are not supported in GNU C++.
4671 The parser cannot detect this error since it does not know whether
4672 a given brace-enclosed initializer is for a class type or for an
4673 array. This function checks that CE does not use a designated
4674 initializer. If it does, an error is issued. Returns true if CE
4675 is valid, i.e., does not have a designated initializer. */
4678 check_array_designated_initializer (const constructor_elt *ce,
4679 unsigned HOST_WIDE_INT index)
4681 /* Designated initializers for array elements are not supported. */
4684 /* The parser only allows identifiers as designated
4686 if (ce->index == error_mark_node)
4687 error ("name used in a GNU-style designated "
4688 "initializer for an array");
4689 else if (TREE_CODE (ce->index) == INTEGER_CST)
4691 /* A C99 designator is OK if it matches the current index. */
4692 if (TREE_INT_CST_LOW (ce->index) == index)
4695 sorry ("non-trivial designated initializers not supported");
4699 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4700 error ("name %qD used in a GNU-style designated "
4701 "initializer for an array", ce->index);
4709 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4710 array until we finish parsing the initializer. If that's the
4711 situation we're in, update DECL accordingly. */
4714 maybe_deduce_size_from_array_init (tree decl, tree init)
4716 tree type = TREE_TYPE (decl);
4718 if (TREE_CODE (type) == ARRAY_TYPE
4719 && TYPE_DOMAIN (type) == NULL_TREE
4720 && TREE_CODE (decl) != TYPE_DECL)
4722 /* do_default is really a C-ism to deal with tentative definitions.
4723 But let's leave it here to ease the eventual merge. */
4724 int do_default = !DECL_EXTERNAL (decl);
4725 tree initializer = init ? init : DECL_INITIAL (decl);
4728 /* Check that there are no designated initializers in INIT, as
4729 those are not supported in GNU C++, and as the middle-end
4730 will crash if presented with a non-numeric designated
4732 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4734 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4735 constructor_elt *ce;
4737 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4738 if (!check_array_designated_initializer (ce, i))
4744 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4748 error ("initializer fails to determine size of %qD", decl);
4749 TREE_TYPE (decl) = error_mark_node;
4751 else if (failure == 2)
4755 error ("array size missing in %qD", decl);
4756 TREE_TYPE (decl) = error_mark_node;
4758 /* If a `static' var's size isn't known, make it extern as
4759 well as static, so it does not get allocated. If it's not
4760 `static', then don't mark it extern; finish_incomplete_decl
4761 will give it a default size and it will get allocated. */
4762 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4763 DECL_EXTERNAL (decl) = 1;
4765 else if (failure == 3)
4767 error ("zero-size array %qD", decl);
4768 TREE_TYPE (decl) = error_mark_node;
4772 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4774 relayout_decl (decl);
4778 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4779 any appropriate error messages regarding the layout. */
4782 layout_var_decl (tree decl)
4786 type = TREE_TYPE (decl);
4787 if (type == error_mark_node)
4790 /* If we haven't already layed out this declaration, do so now.
4791 Note that we must not call complete type for an external object
4792 because it's type might involve templates that we are not
4793 supposed to instantiate yet. (And it's perfectly valid to say
4794 `extern X x' for some incomplete type `X'.) */
4795 if (!DECL_EXTERNAL (decl))
4796 complete_type (type);
4797 if (!DECL_SIZE (decl)
4798 && TREE_TYPE (decl) != error_mark_node
4799 && (COMPLETE_TYPE_P (type)
4800 || (TREE_CODE (type) == ARRAY_TYPE
4801 && !TYPE_DOMAIN (type)
4802 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4803 layout_decl (decl, 0);
4805 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4807 /* An automatic variable with an incomplete type: that is an error.
4808 Don't talk about array types here, since we took care of that
4809 message in grokdeclarator. */
4810 error ("storage size of %qD isn%'t known", decl);
4811 TREE_TYPE (decl) = error_mark_node;
4814 /* Keep this code around in case we later want to control debug info
4815 based on whether a type is "used". (jason 1999-11-11) */
4817 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4818 /* Let debugger know it should output info for this type. */
4819 note_debug_info_needed (ttype);
4821 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4822 note_debug_info_needed (DECL_CONTEXT (decl));
4825 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4826 && DECL_SIZE (decl) != NULL_TREE
4827 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4829 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4830 constant_expression_warning (DECL_SIZE (decl));
4833 error ("storage size of %qD isn%'t constant", decl);
4834 TREE_TYPE (decl) = error_mark_node;
4839 /* If a local static variable is declared in an inline function, or if
4840 we have a weak definition, we must endeavor to create only one
4841 instance of the variable at link-time. */
4844 maybe_commonize_var (tree decl)
4846 /* Static data in a function with comdat linkage also has comdat
4848 if (TREE_STATIC (decl)
4849 /* Don't mess with __FUNCTION__. */
4850 && ! DECL_ARTIFICIAL (decl)
4851 && DECL_FUNCTION_SCOPE_P (decl)
4852 && vague_linkage_p (DECL_CONTEXT (decl)))
4856 /* With weak symbols, we simply make the variable COMDAT;
4857 that will cause copies in multiple translations units to
4859 comdat_linkage (decl);
4863 if (DECL_INITIAL (decl) == NULL_TREE
4864 || DECL_INITIAL (decl) == error_mark_node)
4866 /* Without weak symbols, we can use COMMON to merge
4867 uninitialized variables. */
4868 TREE_PUBLIC (decl) = 1;
4869 DECL_COMMON (decl) = 1;
4873 /* While for initialized variables, we must use internal
4874 linkage -- which means that multiple copies will not
4876 TREE_PUBLIC (decl) = 0;
4877 DECL_COMMON (decl) = 0;
4878 warning_at (input_location, 0,
4879 "sorry: semantics of inline function static "
4880 "data %q+#D are wrong (you%'ll wind up "
4881 "with multiple copies)", decl);
4882 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4883 " you can work around this by removing "
4888 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4889 /* Set it up again; we might have set DECL_INITIAL since the last
4891 comdat_linkage (decl);
4894 /* Issue an error message if DECL is an uninitialized const variable. */
4897 check_for_uninitialized_const_var (tree decl)
4899 tree type = strip_array_types (TREE_TYPE (decl));
4901 /* ``Unless explicitly declared extern, a const object does not have
4902 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4904 if (TREE_CODE (decl) == VAR_DECL
4905 && TREE_CODE (type) != REFERENCE_TYPE
4906 && CP_TYPE_CONST_P (type)
4907 && !DECL_INITIAL (decl))
4909 tree field = default_init_uninitialized_part (type);
4913 permerror (DECL_SOURCE_LOCATION (decl),
4914 "uninitialized const %qD", decl);
4916 if (CLASS_TYPE_P (type))
4918 tree defaulted_ctor;
4920 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4921 "%q#T has no user-provided default constructor", type);
4922 defaulted_ctor = in_class_defaulted_default_constructor (type);
4924 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4925 "constructor is not user-provided because it is "
4926 "explicitly defaulted in the class body");
4927 inform (0, "and the implicitly-defined constructor does not "
4928 "initialize %q+#D", field);
4933 /* Structure holding the current initializer being processed by reshape_init.
4934 CUR is a pointer to the current element being processed, END is a pointer
4935 after the last element present in the initializer. */
4936 typedef struct reshape_iterator_t
4938 constructor_elt *cur;
4939 constructor_elt *end;
4942 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4944 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4945 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4946 initialized. If there are no more such fields, the return value
4950 next_initializable_field (tree field)
4953 && (TREE_CODE (field) != FIELD_DECL
4954 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4955 || DECL_ARTIFICIAL (field)))
4956 field = DECL_CHAIN (field);
4961 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4962 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4963 INTEGER_CST representing the size of the array minus one (the maximum index),
4964 or NULL_TREE if the array was declared without specifying the size. D is
4965 the iterator within the constructor. */
4968 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4969 tsubst_flags_t complain)
4972 bool sized_array_p = (max_index != NULL_TREE);
4973 unsigned HOST_WIDE_INT max_index_cst = 0;
4974 unsigned HOST_WIDE_INT index;
4976 /* The initializer for an array is always a CONSTRUCTOR. */
4977 new_init = build_constructor (init_list_type_node, NULL);
4981 /* Minus 1 is used for zero sized arrays. */
4982 if (integer_all_onesp (max_index))
4985 if (host_integerp (max_index, 1))
4986 max_index_cst = tree_low_cst (max_index, 1);
4987 /* sizetype is sign extended, not zero extended. */
4989 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4993 /* Loop until there are no more initializers. */
4995 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5000 check_array_designated_initializer (d->cur, index);
5001 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5003 if (elt_init == error_mark_node)
5004 return error_mark_node;
5005 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5006 size_int (index), elt_init);
5007 if (!TREE_CONSTANT (elt_init))
5008 TREE_CONSTANT (new_init) = false;
5014 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5015 Parameters are the same of reshape_init_r. */
5018 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5020 tree max_index = NULL_TREE;
5022 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5024 if (TYPE_DOMAIN (type))
5025 max_index = array_type_nelts (type);
5027 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5030 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5031 Parameters are the same of reshape_init_r. */
5034 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5036 tree max_index = NULL_TREE;
5038 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5040 if (COMPOUND_LITERAL_P (d->cur->value))
5042 tree value = d->cur->value;
5043 if (!same_type_p (TREE_TYPE (value), type))
5045 if (complain & tf_error)
5046 error ("invalid type %qT as initializer for a vector of type %qT",
5047 TREE_TYPE (d->cur->value), type);
5048 value = error_mark_node;
5054 /* For a vector, we initialize it as an array of the appropriate size. */
5055 if (TREE_CODE (type) == VECTOR_TYPE)
5056 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5058 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5061 /* Subroutine of reshape_init_r, processes the initializers for classes
5062 or union. Parameters are the same of reshape_init_r. */
5065 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5066 tsubst_flags_t complain)
5071 gcc_assert (CLASS_TYPE_P (type));
5073 /* The initializer for a class is always a CONSTRUCTOR. */
5074 new_init = build_constructor (init_list_type_node, NULL);
5075 field = next_initializable_field (TYPE_FIELDS (type));
5081 An initializer for an aggregate member that is an
5082 empty class shall have the form of an empty
5083 initializer-list {}. */
5084 if (!first_initializer_p)
5086 if (complain & tf_error)
5087 error ("initializer for %qT must be brace-enclosed", type);
5088 return error_mark_node;
5093 /* Loop through the initializable fields, gathering initializers. */
5094 while (d->cur != d->end)
5098 /* Handle designated initializers, as an extension. */
5101 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5103 if (complain & tf_error)
5104 error ("%<[%E] =%> used in a GNU-style designated initializer"
5105 " for class %qT", d->cur->index, type);
5106 return error_mark_node;
5109 if (TREE_CODE (d->cur->index) == FIELD_DECL)
5110 /* We already reshaped this. */
5111 gcc_assert (d->cur->index == field);
5113 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5115 if (!field || TREE_CODE (field) != FIELD_DECL)
5117 if (complain & tf_error)
5118 error ("%qT has no non-static data member named %qD", type,
5120 return error_mark_node;
5124 /* If we processed all the member of the class, we are done. */
5128 field_init = reshape_init_r (TREE_TYPE (field), d,
5129 /*first_initializer_p=*/false, complain);
5130 if (field_init == error_mark_node)
5131 return error_mark_node;
5133 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5137 When a union is initialized with a brace-enclosed
5138 initializer, the braces shall only contain an
5139 initializer for the first member of the union. */
5140 if (TREE_CODE (type) == UNION_TYPE)
5143 field = next_initializable_field (DECL_CHAIN (field));
5149 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5150 designators are not valid; either complain or return true to indicate
5151 that reshape_init_r should return error_mark_node. */
5154 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5158 if (complain & tf_error)
5159 error ("C99 designator %qE outside aggregate initializer",
5167 /* Subroutine of reshape_init, which processes a single initializer (part of
5168 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5169 iterator within the CONSTRUCTOR which points to the initializer to process.
5170 FIRST_INITIALIZER_P is true if this is the first initializer of the
5171 outermost CONSTRUCTOR node. */
5174 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5175 tsubst_flags_t complain)
5177 tree init = d->cur->value;
5179 if (error_operand_p (init))
5180 return error_mark_node;
5182 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5183 && has_designator_problem (d, complain))
5184 return error_mark_node;
5186 if (TREE_CODE (type) == COMPLEX_TYPE)
5188 /* A complex type can be initialized from one or two initializers,
5189 but braces are not elided. */
5191 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5193 if (CONSTRUCTOR_NELTS (init) > 2)
5195 if (complain & tf_error)
5196 error ("too many initializers for %qT", type);
5198 return error_mark_node;
5201 else if (first_initializer_p && d->cur != d->end)
5203 VEC(constructor_elt, gc) *v = 0;
5204 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5205 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5206 if (has_designator_problem (d, complain))
5207 return error_mark_node;
5209 init = build_constructor (init_list_type_node, v);
5214 /* A non-aggregate type is always initialized with a single
5216 if (!CP_AGGREGATE_TYPE_P (type))
5218 /* It is invalid to initialize a non-aggregate type with a
5219 brace-enclosed initializer before C++0x.
5220 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5221 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5222 a CONSTRUCTOR (with a record type). */
5223 if (TREE_CODE (init) == CONSTRUCTOR
5224 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5226 if (SCALAR_TYPE_P (type))
5228 if (complain & tf_error)
5229 error ("braces around scalar initializer for type %qT", type);
5230 init = error_mark_node;
5233 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5242 All implicit type conversions (clause _conv_) are considered when
5243 initializing the aggregate member with an initializer from an
5244 initializer-list. If the initializer can initialize a member,
5245 the member is initialized. Otherwise, if the member is itself a
5246 non-empty subaggregate, brace elision is assumed and the
5247 initializer is considered for the initialization of the first
5248 member of the subaggregate. */
5249 if (TREE_CODE (init) != CONSTRUCTOR
5250 /* But don't try this for the first initializer, since that would be
5251 looking through the outermost braces; A a2 = { a1 }; is not a
5252 valid aggregate initialization. */
5253 && !first_initializer_p
5254 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5255 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL,
5262 /* [dcl.init.string]
5264 A char array (whether plain char, signed char, or unsigned char)
5265 can be initialized by a string-literal (optionally enclosed in
5266 braces); a wchar_t array can be initialized by a wide
5267 string-literal (optionally enclosed in braces). */
5268 if (TREE_CODE (type) == ARRAY_TYPE
5269 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5271 tree str_init = init;
5273 /* Strip one level of braces if and only if they enclose a single
5274 element (as allowed by [dcl.init.string]). */
5275 if (!first_initializer_p
5276 && TREE_CODE (str_init) == CONSTRUCTOR
5277 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5279 str_init = VEC_index (constructor_elt,
5280 CONSTRUCTOR_ELTS (str_init), 0).value;
5283 /* If it's a string literal, then it's the initializer for the array
5284 as a whole. Otherwise, continue with normal initialization for
5285 array types (one value per array element). */
5286 if (TREE_CODE (str_init) == STRING_CST)
5288 if (has_designator_problem (d, complain))
5289 return error_mark_node;
5295 /* The following cases are about aggregates. If we are not within a full
5296 initializer already, and there is not a CONSTRUCTOR, it means that there
5297 is a missing set of braces (that is, we are processing the case for
5298 which reshape_init exists). */
5299 if (!first_initializer_p)
5301 if (TREE_CODE (init) == CONSTRUCTOR)
5303 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5304 /* There is no need to reshape pointer-to-member function
5305 initializers, as they are always constructed correctly
5306 by the front end. */
5308 else if (COMPOUND_LITERAL_P (init))
5309 /* For a nested compound literal, there is no need to reshape since
5310 brace elision is not allowed. Even if we decided to allow it,
5311 we should add a call to reshape_init in finish_compound_literal,
5312 before calling digest_init, so changing this code would still
5313 not be necessary. */
5314 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5318 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5319 return reshape_init (type, init, complain);
5323 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5327 /* Dispatch to specialized routines. */
5328 if (CLASS_TYPE_P (type))
5329 return reshape_init_class (type, d, first_initializer_p, complain);
5330 else if (TREE_CODE (type) == ARRAY_TYPE)
5331 return reshape_init_array (type, d, complain);
5332 else if (TREE_CODE (type) == VECTOR_TYPE)
5333 return reshape_init_vector (type, d, complain);
5338 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5339 brace-enclosed aggregate initializer.
5341 INIT is the CONSTRUCTOR containing the list of initializers describing
5342 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5343 It may not presently match the shape of the TYPE; for example:
5345 struct S { int a; int b; };
5346 struct S a[] = { 1, 2, 3, 4 };
5348 Here INIT will hold a VEC of four elements, rather than a
5349 VEC of two elements, each itself a VEC of two elements. This
5350 routine transforms INIT from the former form into the latter. The
5351 revised CONSTRUCTOR node is returned. */
5354 reshape_init (tree type, tree init, tsubst_flags_t complain)
5356 VEC(constructor_elt, gc) *v;
5360 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5362 v = CONSTRUCTOR_ELTS (init);
5364 /* An empty constructor does not need reshaping, and it is always a valid
5366 if (VEC_empty (constructor_elt, v))
5369 /* Recurse on this CONSTRUCTOR. */
5370 d.cur = &VEC_index (constructor_elt, v, 0);
5371 d.end = d.cur + VEC_length (constructor_elt, v);
5373 new_init = reshape_init_r (type, &d, true, complain);
5374 if (new_init == error_mark_node)
5375 return error_mark_node;
5377 /* Make sure all the element of the constructor were used. Otherwise,
5378 issue an error about exceeding initializers. */
5381 if (complain & tf_error)
5382 error ("too many initializers for %qT", type);
5384 return error_mark_node;
5390 /* Verify array initializer. Returns true if errors have been reported. */
5393 check_array_initializer (tree decl, tree type, tree init)
5395 tree element_type = TREE_TYPE (type);
5397 /* The array type itself need not be complete, because the
5398 initializer may tell us how many elements are in the array.
5399 But, the elements of the array must be complete. */
5400 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5403 error ("elements of array %q#D have incomplete type", decl);
5405 error ("elements of array %q#T have incomplete type", type);
5408 /* It is not valid to initialize a VLA. */
5410 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5411 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5414 error ("variable-sized object %qD may not be initialized", decl);
5416 error ("variable-sized compound literal");
5422 /* Subroutine of check_initializer; args are passed down from that function.
5423 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5426 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5429 gcc_assert (stmts_are_full_exprs_p ());
5430 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5433 /* Verify INIT (the initializer for DECL), and record the
5434 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5435 grok_reference_init.
5437 If the return value is non-NULL, it is an expression that must be
5438 evaluated dynamically to initialize DECL. */
5441 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5443 tree type = TREE_TYPE (decl);
5444 tree init_code = NULL;
5445 tree extra_init = NULL_TREE;
5448 /* Things that are going to be initialized need to have complete
5450 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5452 if (DECL_HAS_VALUE_EXPR_P (decl))
5454 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5455 it doesn't have storage to be initialized. */
5456 gcc_assert (init == NULL_TREE);
5460 if (type == error_mark_node)
5461 /* We will have already complained. */
5464 if (TREE_CODE (type) == ARRAY_TYPE)
5466 if (check_array_initializer (decl, type, init))
5469 else if (!COMPLETE_TYPE_P (type))
5471 error ("%q#D has incomplete type", decl);
5472 TREE_TYPE (decl) = error_mark_node;
5476 /* There is no way to make a variable-sized class type in GNU C++. */
5477 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5479 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5481 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5482 if (SCALAR_TYPE_P (type))
5486 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5487 init = build_zero_init (type, NULL_TREE, false);
5489 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5491 error ("scalar object %qD requires one element in initializer",
5493 TREE_TYPE (decl) = error_mark_node;
5499 if (TREE_CODE (decl) == CONST_DECL)
5501 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5503 DECL_INITIAL (decl) = init;
5505 gcc_assert (init != NULL_TREE);
5508 else if (!init && DECL_REALLY_EXTERN (decl))
5510 else if (init || type_build_ctor_call (type)
5511 || TREE_CODE (type) == REFERENCE_TYPE)
5513 if (TREE_CODE (type) == REFERENCE_TYPE)
5515 init = grok_reference_init (decl, type, init, flags);
5516 flags |= LOOKUP_ALREADY_DIGESTED;
5519 check_for_uninitialized_const_var (decl);
5520 /* Do not reshape constructors of vectors (they don't need to be
5522 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5524 if (is_std_init_list (type))
5526 init = perform_implicit_conversion (type, init,
5527 tf_warning_or_error);
5528 flags |= LOOKUP_ALREADY_DIGESTED;
5530 else if (TYPE_NON_AGGREGATE_CLASS (type))
5532 /* Don't reshape if the class has constructors. */
5533 if (cxx_dialect == cxx98)
5534 error ("in C++98 %qD must be initialized by constructor, "
5538 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5540 error ("opaque vector types cannot be initialized");
5541 init = error_mark_node;
5545 init = reshape_init (type, init, tf_warning_or_error);
5546 if (SCALAR_TYPE_P (type))
5547 check_narrowing (type, init);
5551 /* If DECL has an array type without a specific bound, deduce the
5552 array size from the initializer. */
5553 maybe_deduce_size_from_array_init (decl, init);
5554 type = TREE_TYPE (decl);
5555 if (type == error_mark_node)
5558 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5559 && !(flags & LOOKUP_ALREADY_DIGESTED)
5560 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5561 && CP_AGGREGATE_TYPE_P (type)))
5563 init_code = build_aggr_init_full_exprs (decl, init, flags);
5565 /* If this is a constexpr initializer, expand_default_init will
5566 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5567 case, pull the initializer back out and pass it down into
5568 store_init_value. */
5569 while (TREE_CODE (init_code) == EXPR_STMT
5570 || TREE_CODE (init_code) == CONVERT_EXPR)
5571 init_code = TREE_OPERAND (init_code, 0);
5572 if (TREE_CODE (init_code) == INIT_EXPR)
5574 init = TREE_OPERAND (init_code, 1);
5575 init_code = NULL_TREE;
5576 /* Don't call digest_init; it's unnecessary and will complain
5577 about aggregate initialization of non-aggregate classes. */
5578 flags |= LOOKUP_ALREADY_DIGESTED;
5580 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5582 /* Declared constexpr, but no suitable initializer; massage
5583 init appropriately so we can pass it into store_init_value
5585 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5586 init = finish_compound_literal (type, init,
5587 tf_warning_or_error);
5588 else if (CLASS_TYPE_P (type)
5589 && (!init || TREE_CODE (init) == TREE_LIST))
5591 init = build_functional_cast (type, init, tf_none);
5592 if (init != error_mark_node)
5593 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5595 init_code = NULL_TREE;
5601 if (init && TREE_CODE (init) != TREE_VEC)
5603 /* In aggregate initialization of a variable, each element
5604 initialization is a full-expression because there is no
5605 enclosing expression. */
5606 gcc_assert (stmts_are_full_exprs_p ());
5608 init_code = store_init_value (decl, init, cleanups, flags);
5610 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5611 && DECL_INITIAL (decl)
5612 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5613 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5614 warning (0, "array %qD initialized by parenthesized string literal %qE",
5615 decl, DECL_INITIAL (decl));
5621 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5622 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5623 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5624 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5627 check_for_uninitialized_const_var (decl);
5630 if (init && init != error_mark_node)
5631 init_code = build2 (INIT_EXPR, type, decl, init);
5634 init_code = add_stmt_to_compound (extra_init, init_code);
5636 if (init_code && DECL_IN_AGGR_P (decl))
5638 static int explained = 0;
5640 if (cxx_dialect < cxx0x)
5641 error ("initializer invalid for static member with constructor");
5643 error ("non-constant in-class initialization invalid for static "
5644 "member %qD", decl);
5647 error ("(an out of class initialization is required)");
5655 /* If DECL is not a local variable, give it RTL. */
5658 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5660 int toplev = toplevel_bindings_p ();
5662 const char *filename;
5664 /* Set the DECL_ASSEMBLER_NAME for the object. */
5667 /* The `register' keyword, when used together with an
5668 asm-specification, indicates that the variable should be
5669 placed in a particular register. */
5670 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5672 set_user_assembler_name (decl, asmspec);
5673 DECL_HARD_REGISTER (decl) = 1;
5677 if (TREE_CODE (decl) == FUNCTION_DECL
5678 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5679 set_builtin_user_assembler_name (decl, asmspec);
5680 set_user_assembler_name (decl, asmspec);
5684 /* Handle non-variables up front. */
5685 if (TREE_CODE (decl) != VAR_DECL)
5687 rest_of_decl_compilation (decl, toplev, at_eof);
5691 /* If we see a class member here, it should be a static data
5693 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5695 gcc_assert (TREE_STATIC (decl));
5696 /* An in-class declaration of a static data member should be
5697 external; it is only a declaration, and not a definition. */
5698 if (init == NULL_TREE)
5699 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5702 /* We don't create any RTL for local variables. */
5703 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5706 /* We defer emission of local statics until the corresponding
5707 DECL_EXPR is expanded. */
5708 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5710 /* We try to defer namespace-scope static constants so that they are
5711 not emitted into the object file unnecessarily. */
5712 filename = input_filename;
5713 if (!DECL_VIRTUAL_P (decl)
5714 && TREE_READONLY (decl)
5715 && DECL_INITIAL (decl) != NULL_TREE
5716 && DECL_INITIAL (decl) != error_mark_node
5718 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5720 && !TREE_PUBLIC (decl))
5722 /* Fool with the linkage of static consts according to #pragma
5724 struct c_fileinfo *finfo = get_fileinfo (filename);
5725 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5727 TREE_PUBLIC (decl) = 1;
5728 DECL_EXTERNAL (decl) = finfo->interface_only;
5733 /* Likewise for template instantiations. */
5734 else if (DECL_LANG_SPECIFIC (decl)
5735 && DECL_IMPLICIT_INSTANTIATION (decl))
5738 /* If we're not deferring, go ahead and assemble the variable. */
5740 rest_of_decl_compilation (decl, toplev, at_eof);
5743 /* walk_tree helper for wrap_temporary_cleanups, below. */
5746 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5748 /* Stop at types or full-expression boundaries. */
5749 if (TYPE_P (*stmt_p)
5750 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5756 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5758 tree guard = (tree)data;
5759 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5761 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5762 /* Tell honor_protect_cleanup_actions to handle this as a separate
5764 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5766 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5772 /* We're initializing a local variable which has a cleanup GUARD. If there
5773 are any temporaries used in the initializer INIT of this variable, we
5774 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5775 variable will be cleaned up properly if one of them throws.
5777 Unfortunately, there's no way to express this properly in terms of
5778 nesting, as the regions for the temporaries overlap the region for the
5779 variable itself; if there are two temporaries, the variable needs to be
5780 the first thing destroyed if either of them throws. However, we only
5781 want to run the variable's cleanup if it actually got constructed. So
5782 we need to guard the temporary cleanups with the variable's cleanup if
5783 they are run on the normal path, but not if they are run on the
5784 exceptional path. We implement this by telling
5785 honor_protect_cleanup_actions to strip the variable cleanup from the
5786 exceptional path. */
5789 wrap_temporary_cleanups (tree init, tree guard)
5791 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5794 /* Generate code to initialize DECL (a local variable). */
5797 initialize_local_var (tree decl, tree init)
5799 tree type = TREE_TYPE (decl);
5803 gcc_assert (TREE_CODE (decl) == VAR_DECL
5804 || TREE_CODE (decl) == RESULT_DECL);
5805 gcc_assert (!TREE_STATIC (decl));
5807 if (DECL_SIZE (decl) == NULL_TREE)
5809 /* If we used it already as memory, it must stay in memory. */
5810 DECL_INITIAL (decl) = NULL_TREE;
5811 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5815 if (type == error_mark_node)
5818 /* Compute and store the initial value. */
5819 already_used = TREE_USED (decl) || TREE_USED (type);
5820 if (TREE_USED (type))
5821 DECL_READ_P (decl) = 1;
5823 /* Generate a cleanup, if necessary. */
5824 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5826 /* Perform the initialization. */
5829 if (TREE_CODE (init) == INIT_EXPR
5830 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5832 /* Stick simple initializers in DECL_INITIAL so that
5833 -Wno-init-self works (c++/34772). */
5834 gcc_assert (TREE_OPERAND (init, 0) == decl);
5835 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5839 int saved_stmts_are_full_exprs_p;
5841 /* If we're only initializing a single object, guard the
5842 destructors of any temporaries used in its initializer with
5843 its destructor. This isn't right for arrays because each
5844 element initialization is a full-expression. */
5845 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5846 wrap_temporary_cleanups (init, cleanup);
5848 gcc_assert (building_stmt_list_p ());
5849 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5850 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5851 finish_expr_stmt (init);
5852 current_stmt_tree ()->stmts_are_full_exprs_p =
5853 saved_stmts_are_full_exprs_p;
5857 /* Set this to 0 so we can tell whether an aggregate which was
5858 initialized was ever used. Don't do this if it has a
5859 destructor, so we don't complain about the 'resource
5860 allocation is initialization' idiom. Now set
5861 attribute((unused)) on types so decls of that type will be
5862 marked used. (see TREE_USED, above.) */
5863 if (TYPE_NEEDS_CONSTRUCTING (type)
5865 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5866 && DECL_NAME (decl))
5867 TREE_USED (decl) = 0;
5868 else if (already_used)
5869 TREE_USED (decl) = 1;
5872 finish_decl_cleanup (decl, cleanup);
5875 /* DECL is a VAR_DECL for a compiler-generated variable with static
5876 storage duration (like a virtual table) whose initializer is a
5877 compile-time constant. Initialize the variable and provide it to the
5881 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5884 gcc_assert (DECL_ARTIFICIAL (decl));
5885 init = build_constructor (TREE_TYPE (decl), v);
5886 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5887 DECL_INITIAL (decl) = init;
5888 DECL_INITIALIZED_P (decl) = 1;
5889 determine_visibility (decl);
5890 layout_var_decl (decl);
5891 maybe_commonize_var (decl);
5892 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5895 /* INIT is the initializer for a variable, as represented by the
5896 parser. Returns true iff INIT is type-dependent. */
5899 type_dependent_init_p (tree init)
5901 if (TREE_CODE (init) == TREE_LIST)
5902 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5903 return any_type_dependent_elements_p (init);
5904 else if (TREE_CODE (init) == CONSTRUCTOR)
5905 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5907 VEC(constructor_elt, gc) *elts;
5911 elts = CONSTRUCTOR_ELTS (init);
5912 nelts = VEC_length (constructor_elt, elts);
5913 for (i = 0; i < nelts; ++i)
5914 if (type_dependent_init_p (VEC_index (constructor_elt,
5919 /* It must be a simple expression, e.g., int i = 3; */
5920 return type_dependent_expression_p (init);
5925 /* INIT is the initializer for a variable, as represented by the
5926 parser. Returns true iff INIT is value-dependent. */
5929 value_dependent_init_p (tree init)
5931 if (TREE_CODE (init) == TREE_LIST)
5932 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5933 return any_value_dependent_elements_p (init);
5934 else if (TREE_CODE (init) == CONSTRUCTOR)
5935 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5937 VEC(constructor_elt, gc) *elts;
5941 elts = CONSTRUCTOR_ELTS (init);
5942 nelts = VEC_length (constructor_elt, elts);
5943 for (i = 0; i < nelts; ++i)
5944 if (value_dependent_init_p (VEC_index (constructor_elt,
5949 /* It must be a simple expression, e.g., int i = 3; */
5950 return value_dependent_expression_p (init);
5955 /* Finish processing of a declaration;
5956 install its line number and initial value.
5957 If the length of an array type is not known before,
5958 it must be determined now, from the initial value, or it is an error.
5960 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5961 true, then INIT is an integral constant expression.
5963 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5964 if the (init) syntax was used. */
5967 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5968 tree asmspec_tree, int flags)
5971 VEC(tree,gc) *cleanups = NULL;
5972 const char *asmspec = NULL;
5973 int was_readonly = 0;
5974 bool var_definition_p = false;
5977 if (decl == error_mark_node)
5982 error ("assignment (not initialization) in declaration");
5986 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5987 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5988 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5990 type = TREE_TYPE (decl);
5991 if (type == error_mark_node)
5994 /* If a name was specified, get the string. */
5995 if (at_namespace_scope_p ())
5996 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5997 if (asmspec_tree && asmspec_tree != error_mark_node)
5998 asmspec = TREE_STRING_POINTER (asmspec_tree);
6000 if (current_class_type
6001 && CP_DECL_CONTEXT (decl) == current_class_type
6002 && TYPE_BEING_DEFINED (current_class_type)
6003 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6004 && (DECL_INITIAL (decl) || init))
6005 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6007 if (TREE_CODE (decl) != FUNCTION_DECL
6008 && (auto_node = type_uses_auto (type)))
6011 if (init == NULL_TREE)
6013 error ("declaration of %q#D has no initializer", decl);
6014 TREE_TYPE (decl) = error_mark_node;
6018 if (TREE_CODE (d_init) == TREE_LIST)
6019 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6020 tf_warning_or_error);
6021 d_init = resolve_nondeduced_context (d_init);
6022 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6024 if (type == error_mark_node)
6028 if (!ensure_literal_type_for_constexpr_object (decl))
6029 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6031 if (TREE_CODE (decl) == VAR_DECL
6032 && DECL_CLASS_SCOPE_P (decl)
6033 && DECL_INITIALIZED_IN_CLASS_P (decl))
6034 check_static_variable_definition (decl, type);
6036 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6039 if (init == ridpointers[(int)RID_DELETE])
6041 /* FIXME check this is 1st decl. */
6042 DECL_DELETED_FN (decl) = 1;
6043 DECL_DECLARED_INLINE_P (decl) = 1;
6044 DECL_INITIAL (decl) = error_mark_node;
6045 FOR_EACH_CLONE (clone, decl)
6047 DECL_DELETED_FN (clone) = 1;
6048 DECL_DECLARED_INLINE_P (clone) = 1;
6049 DECL_INITIAL (clone) = error_mark_node;
6053 else if (init == ridpointers[(int)RID_DEFAULT])
6055 if (defaultable_fn_check (decl))
6056 DECL_DEFAULTED_FN (decl) = 1;
6058 DECL_INITIAL (decl) = NULL_TREE;
6062 if (init && TREE_CODE (decl) == VAR_DECL)
6064 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6065 /* If DECL is a reference, then we want to know whether init is a
6066 reference constant; init_const_expr_p as passed tells us whether
6067 it's an rvalue constant. */
6068 if (TREE_CODE (type) == REFERENCE_TYPE)
6069 init_const_expr_p = potential_constant_expression (init);
6070 if (init_const_expr_p)
6072 /* Set these flags now for templates. We'll update the flags in
6073 store_init_value for instantiations. */
6074 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6075 if (decl_maybe_constant_var_p (decl))
6076 TREE_CONSTANT (decl) = 1;
6080 if (processing_template_decl)
6082 bool type_dependent_p;
6084 /* Add this declaration to the statement-tree. */
6085 if (at_function_scope_p ())
6086 add_decl_expr (decl);
6088 type_dependent_p = dependent_type_p (type);
6090 if (check_for_bare_parameter_packs (init))
6093 DECL_INITIAL (decl) = NULL_TREE;
6096 /* Generally, initializers in templates are expanded when the
6097 template is instantiated. But, if DECL is a variable constant
6098 then it can be used in future constant expressions, so its value
6099 must be available. */
6101 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6102 /* We can't do anything if the decl has dependent type. */;
6104 && init_const_expr_p
6105 && !type_dependent_p
6106 && decl_maybe_constant_var_p (decl)
6107 && !type_dependent_init_p (init)
6108 && !value_dependent_init_p (init))
6110 /* This variable seems to be a non-dependent constant, so process
6111 its initializer. If check_initializer returns non-null the
6112 initialization wasn't constant after all. */
6114 cleanups = make_tree_vector ();
6115 init_code = check_initializer (decl, init, flags, &cleanups);
6116 if (init_code == NULL_TREE)
6118 release_tree_vector (cleanups);
6120 else if (!DECL_PRETTY_FUNCTION_P (decl))
6122 /* Deduce array size even if the initializer is dependent. */
6123 maybe_deduce_size_from_array_init (decl, init);
6124 /* And complain about multiple initializers. */
6125 if (init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init)
6126 && !MAYBE_CLASS_TYPE_P (type))
6127 init = build_x_compound_expr_from_list (init, ELK_INIT,
6128 tf_warning_or_error);
6132 DECL_INITIAL (decl) = init;
6136 /* Just store non-static data member initializers for later. */
6137 if (init && TREE_CODE (decl) == FIELD_DECL)
6138 DECL_INITIAL (decl) = init;
6140 /* Take care of TYPE_DECLs up front. */
6141 if (TREE_CODE (decl) == TYPE_DECL)
6143 if (type != error_mark_node
6144 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6146 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6147 warning (0, "shadowing previous type declaration of %q#D", decl);
6148 set_identifier_type_value (DECL_NAME (decl), decl);
6151 /* If we have installed this as the canonical typedef for this
6152 type, and that type has not been defined yet, delay emitting
6153 the debug information for it, as we will emit it later. */
6154 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6155 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6156 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6158 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6163 /* A reference will be modified here, as it is initialized. */
6164 if (! DECL_EXTERNAL (decl)
6165 && TREE_READONLY (decl)
6166 && TREE_CODE (type) == REFERENCE_TYPE)
6169 TREE_READONLY (decl) = 0;
6172 if (TREE_CODE (decl) == VAR_DECL)
6174 /* Only variables with trivial initialization and destruction can
6175 have thread-local storage. */
6176 if (DECL_THREAD_LOCAL_P (decl)
6177 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6178 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6179 error ("%qD cannot be thread-local because it has non-trivial "
6180 "type %qT", decl, TREE_TYPE (decl));
6181 /* If this is a local variable that will need a mangled name,
6182 register it now. We must do this before processing the
6183 initializer for the variable, since the initialization might
6184 require a guard variable, and since the mangled name of the
6185 guard variable will depend on the mangled name of this
6187 if (DECL_FUNCTION_SCOPE_P (decl)
6188 && TREE_STATIC (decl)
6189 && !DECL_ARTIFICIAL (decl))
6191 push_local_name (decl);
6192 if (DECL_CONSTRUCTOR_P (current_function_decl)
6193 || DECL_DESTRUCTOR_P (current_function_decl))
6194 /* Normally local_decls is populated during GIMPLE lowering,
6195 but [cd]tors are never actually compiled directly. We need
6196 to put statics on the list so we can deal with the label
6197 address extension. FIXME. */
6198 add_local_decl (cfun, decl);
6201 /* Convert the initializer to the type of DECL, if we have not
6202 already initialized DECL. */
6203 if (!DECL_INITIALIZED_P (decl)
6204 /* If !DECL_EXTERNAL then DECL is being defined. In the
6205 case of a static data member initialized inside the
6206 class-specifier, there can be an initializer even if DECL
6207 is *not* defined. */
6208 && (!DECL_EXTERNAL (decl) || init))
6210 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6213 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6214 /* Allow libjava/prims.cc define primitive classes. */
6215 if (init != NULL_TREE
6216 || jclass == NULL_TREE
6217 || TREE_CODE (jclass) != TYPE_DECL
6218 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6219 || !same_type_ignoring_top_level_qualifiers_p
6220 (type, TREE_TYPE (TREE_TYPE (jclass))))
6221 error ("Java object %qD not allocated with %<new%>", decl);
6224 cleanups = make_tree_vector ();
6225 init = check_initializer (decl, init, flags, &cleanups);
6226 /* Thread-local storage cannot be dynamically initialized. */
6227 if (DECL_THREAD_LOCAL_P (decl) && init)
6229 error ("%qD is thread-local and so cannot be dynamically "
6230 "initialized", decl);
6234 /* Check that the initializer for a static data member was a
6235 constant. Although we check in the parser that the
6236 initializer is an integral constant expression, we do not
6237 simplify division-by-zero at the point at which it
6238 occurs. Therefore, in:
6240 struct S { static const int i = 7 / 0; };
6242 we issue an error at this point. It would
6243 probably be better to forbid division by zero in
6244 integral constant expressions. */
6245 if (DECL_EXTERNAL (decl) && init)
6247 error ("%qD cannot be initialized by a non-constant expression"
6248 " when being declared", decl);
6249 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6257 The memory occupied by any object of static storage
6258 duration is zero-initialized at program startup before
6259 any other initialization takes place.
6261 We cannot create an appropriate initializer until after
6262 the type of DECL is finalized. If DECL_INITIAL is set,
6263 then the DECL is statically initialized, and any
6264 necessary zero-initialization has already been performed. */
6265 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6266 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6267 /*nelts=*/NULL_TREE,
6268 /*static_storage_p=*/true);
6269 /* Remember that the initialization for this variable has
6271 DECL_INITIALIZED_P (decl) = 1;
6272 /* This declaration is the definition of this variable,
6273 unless we are initializing a static data member within
6274 the class specifier. */
6275 if (!DECL_EXTERNAL (decl))
6276 var_definition_p = true;
6278 /* If the variable has an array type, lay out the type, even if
6279 there is no initializer. It is valid to index through the
6280 array, and we must get TYPE_ALIGN set correctly on the array
6282 else if (TREE_CODE (type) == ARRAY_TYPE)
6285 if (TREE_STATIC (decl)
6286 && !at_function_scope_p ()
6287 && current_function_decl == NULL)
6288 /* So decl is a global variable or a static member of a
6289 non local class. Record the types it uses
6290 so that we can decide later to emit debug info for them. */
6291 record_types_used_by_current_var_decl (decl);
6293 else if (TREE_CODE (decl) == FIELD_DECL
6294 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6295 error ("non-static data member %qD has Java class type", decl);
6297 /* Add this declaration to the statement-tree. This needs to happen
6298 after the call to check_initializer so that the DECL_EXPR for a
6299 reference temp is added before the DECL_EXPR for the reference itself. */
6300 if (DECL_FUNCTION_SCOPE_P (decl))
6301 add_decl_expr (decl);
6303 /* Let the middle end know about variables and functions -- but not
6304 static data members in uninstantiated class templates. */
6305 if (TREE_CODE (decl) == VAR_DECL
6306 || TREE_CODE (decl) == FUNCTION_DECL)
6308 if (TREE_CODE (decl) == VAR_DECL)
6310 layout_var_decl (decl);
6311 maybe_commonize_var (decl);
6314 /* This needs to happen after the linkage is set. */
6315 determine_visibility (decl);
6317 if (var_definition_p && TREE_STATIC (decl))
6319 /* If a TREE_READONLY variable needs initialization
6320 at runtime, it is no longer readonly and we need to
6321 avoid MEM_READONLY_P being set on RTL created for it. */
6324 if (TREE_READONLY (decl))
6325 TREE_READONLY (decl) = 0;
6328 else if (was_readonly)
6329 TREE_READONLY (decl) = 1;
6332 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6334 /* Check for abstractness of the type. Notice that there is no
6335 need to strip array types here since the check for those types
6336 is already done within create_array_type_for_decl. */
6337 if (TREE_CODE (type) == FUNCTION_TYPE
6338 || TREE_CODE (type) == METHOD_TYPE)
6339 abstract_virtuals_error (decl, TREE_TYPE (type));
6341 abstract_virtuals_error (decl, type);
6343 if (TREE_TYPE (decl) == error_mark_node)
6344 /* No initialization required. */
6346 else if (TREE_CODE (decl) == FUNCTION_DECL)
6350 if (init == ridpointers[(int)RID_DEFAULT])
6352 /* An out-of-class default definition is defined at
6353 the point where it is explicitly defaulted. */
6354 if (DECL_DELETED_FN (decl))
6355 maybe_explain_implicit_delete (decl);
6356 else if (DECL_INITIAL (decl) == error_mark_node)
6357 synthesize_method (decl);
6360 error ("function %q#D is initialized like a variable", decl);
6362 /* else no initialization required. */
6364 else if (DECL_EXTERNAL (decl)
6365 && ! (DECL_LANG_SPECIFIC (decl)
6366 && DECL_NOT_REALLY_EXTERN (decl)))
6369 DECL_INITIAL (decl) = init;
6371 /* A variable definition. */
6372 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6373 /* Initialize the local variable. */
6374 initialize_local_var (decl, init);
6376 /* If a variable is defined, and then a subsequent
6377 definition with external linkage is encountered, we will
6378 get here twice for the same variable. We want to avoid
6379 calling expand_static_init more than once. For variables
6380 that are not static data members, we can call
6381 expand_static_init only when we actually process the
6382 initializer. It is not legal to redeclare a static data
6383 member, so this issue does not arise in that case. */
6384 else if (var_definition_p && TREE_STATIC (decl))
6385 expand_static_init (decl, init);
6388 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6389 reference, insert it in the statement-tree now. */
6393 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6394 push_cleanup (decl, t, false);
6395 release_tree_vector (cleanups);
6399 TREE_READONLY (decl) = 1;
6401 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6404 /* Returns a declaration for a VAR_DECL as if:
6406 extern "C" TYPE NAME;
6408 had been seen. Used to create compiler-generated global
6412 declare_global_var (tree name, tree type)
6416 push_to_top_level ();
6417 decl = build_decl (input_location, VAR_DECL, name, type);
6418 TREE_PUBLIC (decl) = 1;
6419 DECL_EXTERNAL (decl) = 1;
6420 DECL_ARTIFICIAL (decl) = 1;
6421 /* If the user has explicitly declared this variable (perhaps
6422 because the code we are compiling is part of a low-level runtime
6423 library), then it is possible that our declaration will be merged
6424 with theirs by pushdecl. */
6425 decl = pushdecl (decl);
6426 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6427 pop_from_top_level ();
6432 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6433 if "__cxa_atexit" is not being used) corresponding to the function
6434 to be called when the program exits. */
6437 get_atexit_fn_ptr_type (void)
6441 if (!atexit_fn_ptr_type_node)
6444 if (flag_use_cxa_atexit
6445 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6446 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6447 arg_type = ptr_type_node;
6449 /* The parameter to "atexit" is "void (*)(void)". */
6450 arg_type = NULL_TREE;
6452 fn_type = build_function_type_list (void_type_node,
6453 arg_type, NULL_TREE);
6454 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6457 return atexit_fn_ptr_type_node;
6460 /* Returns a pointer to the `atexit' function. Note that if
6461 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6462 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6465 get_atexit_node (void)
6471 bool use_aeabi_atexit;
6476 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6478 /* The declaration for `__cxa_atexit' is:
6480 int __cxa_atexit (void (*)(void *), void *, void *)
6482 We build up the argument types and then the function type
6484 tree argtype0, argtype1, argtype2;
6486 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6487 /* First, build the pointer-to-function type for the first
6489 fn_ptr_type = get_atexit_fn_ptr_type ();
6490 /* Then, build the rest of the argument types. */
6491 argtype2 = ptr_type_node;
6492 if (use_aeabi_atexit)
6494 argtype1 = fn_ptr_type;
6495 argtype0 = ptr_type_node;
6499 argtype1 = ptr_type_node;
6500 argtype0 = fn_ptr_type;
6502 /* And the final __cxa_atexit type. */
6503 fn_type = build_function_type_list (integer_type_node,
6504 argtype0, argtype1, argtype2,
6506 fn_ptr_type = build_pointer_type (fn_type);
6507 if (use_aeabi_atexit)
6508 name = "__aeabi_atexit";
6510 name = "__cxa_atexit";
6514 /* The declaration for `atexit' is:
6516 int atexit (void (*)());
6518 We build up the argument types and then the function type
6520 fn_ptr_type = get_atexit_fn_ptr_type ();
6521 /* Build the final atexit type. */
6522 fn_type = build_function_type_list (integer_type_node,
6523 fn_ptr_type, NULL_TREE);
6527 /* Now, build the function declaration. */
6528 push_lang_context (lang_name_c);
6529 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6530 mark_used (atexit_fndecl);
6531 pop_lang_context ();
6532 atexit_node = decay_conversion (atexit_fndecl, tf_warning_or_error);
6537 /* Returns the __dso_handle VAR_DECL. */
6540 get_dso_handle_node (void)
6542 if (dso_handle_node)
6543 return dso_handle_node;
6545 /* Declare the variable. */
6546 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6549 #ifdef HAVE_GAS_HIDDEN
6550 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6551 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6554 return dso_handle_node;
6557 /* Begin a new function with internal linkage whose job will be simply
6558 to destroy some particular variable. */
6560 static GTY(()) int start_cleanup_cnt;
6563 start_cleanup_fn (void)
6568 bool use_cxa_atexit = flag_use_cxa_atexit
6569 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6571 push_to_top_level ();
6573 /* No need to mangle this. */
6574 push_lang_context (lang_name_c);
6576 /* Build the name of the function. */
6577 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6578 /* Build the function declaration. */
6579 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6580 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6581 /* It's a function with internal linkage, generated by the
6583 TREE_PUBLIC (fndecl) = 0;
6584 DECL_ARTIFICIAL (fndecl) = 1;
6585 /* Make the function `inline' so that it is only emitted if it is
6586 actually needed. It is unlikely that it will be inlined, since
6587 it is only called via a function pointer, but we avoid unnecessary
6588 emissions this way. */
6589 DECL_DECLARED_INLINE_P (fndecl) = 1;
6590 DECL_INTERFACE_KNOWN (fndecl) = 1;
6591 /* Build the parameter. */
6596 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6597 DECL_CONTEXT (parmdecl) = fndecl;
6598 TREE_USED (parmdecl) = 1;
6599 DECL_READ_P (parmdecl) = 1;
6600 DECL_ARGUMENTS (fndecl) = parmdecl;
6604 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6606 pop_lang_context ();
6608 return current_function_decl;
6611 /* Finish the cleanup function begun by start_cleanup_fn. */
6614 end_cleanup_fn (void)
6616 expand_or_defer_fn (finish_function (0));
6618 pop_from_top_level ();
6621 /* Generate code to handle the destruction of DECL, an object with
6622 static storage duration. */
6625 register_dtor_fn (tree decl)
6632 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6634 type = TREE_TYPE (decl);
6635 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6636 return void_zero_node;
6638 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6639 a class object, we can just pass the destructor to
6640 "__cxa_atexit"; we don't have to build a temporary function to do
6642 use_dtor = (flag_use_cxa_atexit
6643 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6644 && CLASS_TYPE_P (type));
6649 /* Find the destructor. */
6650 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6651 gcc_assert (idx >= 0);
6652 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6653 /* Make sure it is accessible. */
6654 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup,
6655 tf_warning_or_error);
6659 /* Call build_cleanup before we enter the anonymous function so
6660 that any access checks will be done relative to the current
6661 scope, rather than the scope of the anonymous function. */
6662 build_cleanup (decl);
6664 /* Now start the function. */
6665 cleanup = start_cleanup_fn ();
6667 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6668 to the original function, rather than the anonymous one. That
6669 will make the back end think that nested functions are in use,
6670 which causes confusion. */
6671 push_deferring_access_checks (dk_no_check);
6672 fcall = build_cleanup (decl);
6673 pop_deferring_access_checks ();
6675 /* Create the body of the anonymous function. */
6676 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6677 finish_expr_stmt (fcall);
6678 finish_compound_stmt (compound_stmt);
6682 /* Call atexit with the cleanup function. */
6683 mark_used (cleanup);
6684 cleanup = build_address (cleanup);
6685 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6691 /* We must convert CLEANUP to the type that "__cxa_atexit"
6693 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6694 /* "__cxa_atexit" will pass the address of DECL to the
6695 cleanup function. */
6697 addr = build_address (decl);
6698 /* The declared type of the parameter to "__cxa_atexit" is
6699 "void *". For plain "T*", we could just let the
6700 machinery in cp_build_function_call convert it -- but if the
6701 type is "cv-qualified T *", then we need to convert it
6702 before passing it in, to avoid spurious errors. */
6703 addr = build_nop (ptr_type_node, addr);
6706 /* Since the cleanup functions we build ignore the address
6707 they're given, there's no reason to pass the actual address
6708 in, and, in general, it's cheaper to pass NULL than any
6710 addr = null_pointer_node;
6711 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6712 tf_warning_or_error);
6713 if (targetm.cxx.use_aeabi_atexit ())
6726 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6727 arg0, arg1, arg2, NULL_TREE);
6730 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6731 is its initializer. Generate code to handle the construction
6732 and destruction of DECL. */
6735 expand_static_init (tree decl, tree init)
6737 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6738 gcc_assert (TREE_STATIC (decl));
6740 /* Some variables require no dynamic initialization. */
6742 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6745 if (DECL_FUNCTION_SCOPE_P (decl))
6747 /* Emit code to perform this initialization but once. */
6748 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6749 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6750 tree guard, guard_addr;
6753 /* Emit code to perform this initialization but once. This code
6756 static <type> guard;
6757 if (!guard.first_byte) {
6758 if (__cxa_guard_acquire (&guard)) {
6761 // Do initialization.
6762 flag = true; __cxa_guard_release (&guard);
6763 // Register variable for destruction at end of program.
6765 if (!flag) __cxa_guard_abort (&guard);
6769 Note that the `flag' variable is only set to 1 *after* the
6770 initialization is complete. This ensures that an exception,
6771 thrown during the construction, will cause the variable to
6772 reinitialized when we pass through this code again, as per:
6776 If the initialization exits by throwing an exception, the
6777 initialization is not complete, so it will be tried again
6778 the next time control enters the declaration.
6780 This process should be thread-safe, too; multiple threads
6781 should not be able to initialize the variable more than
6784 /* Create the guard variable. */
6785 guard = get_guard (decl);
6787 /* This optimization isn't safe on targets with relaxed memory
6788 consistency. On such targets we force synchronization in
6789 __cxa_guard_acquire. */
6790 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6792 /* Begin the conditional initialization. */
6793 if_stmt = begin_if_stmt ();
6794 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6795 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6798 if (flag_threadsafe_statics)
6800 tree vfntype = NULL_TREE;
6801 tree acquire_name, release_name, abort_name;
6802 tree acquire_fn, release_fn, abort_fn;
6803 guard_addr = build_address (guard);
6805 acquire_name = get_identifier ("__cxa_guard_acquire");
6806 release_name = get_identifier ("__cxa_guard_release");
6807 abort_name = get_identifier ("__cxa_guard_abort");
6808 acquire_fn = identifier_global_value (acquire_name);
6809 release_fn = identifier_global_value (release_name);
6810 abort_fn = identifier_global_value (abort_name);
6812 acquire_fn = push_library_fn
6813 (acquire_name, build_function_type_list (integer_type_node,
6814 TREE_TYPE (guard_addr),
6817 if (!release_fn || !abort_fn)
6818 vfntype = build_function_type_list (void_type_node,
6819 TREE_TYPE (guard_addr),
6822 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6824 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6826 inner_if_stmt = begin_if_stmt ();
6827 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6830 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6831 begin = get_target_expr (boolean_false_node);
6832 flag = TARGET_EXPR_SLOT (begin);
6834 TARGET_EXPR_CLEANUP (begin)
6835 = build3 (COND_EXPR, void_type_node, flag,
6837 build_call_n (abort_fn, 1, guard_addr));
6838 CLEANUP_EH_ONLY (begin) = 1;
6840 /* Do the initialization itself. */
6841 init = add_stmt_to_compound (begin, init);
6842 init = add_stmt_to_compound
6843 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6844 init = add_stmt_to_compound
6845 (init, build_call_n (release_fn, 1, guard_addr));
6848 init = add_stmt_to_compound (init, set_guard (guard));
6850 /* Use atexit to register a function for destroying this static
6852 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6854 finish_expr_stmt (init);
6856 if (flag_threadsafe_statics)
6858 finish_compound_stmt (inner_then_clause);
6859 finish_then_clause (inner_if_stmt);
6860 finish_if_stmt (inner_if_stmt);
6863 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6865 finish_compound_stmt (then_clause);
6866 finish_then_clause (if_stmt);
6867 finish_if_stmt (if_stmt);
6871 static_aggregates = tree_cons (init, decl, static_aggregates);
6875 /* Make TYPE a complete type based on INITIAL_VALUE.
6876 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6877 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6878 3 if the initializer list is empty (in pedantic mode). */
6881 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6884 tree type, elt_type;
6888 unsigned HOST_WIDE_INT i;
6891 /* An array of character type can be initialized from a
6892 brace-enclosed string constant.
6894 FIXME: this code is duplicated from reshape_init. Probably
6895 we should just call reshape_init here? */
6896 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6897 && TREE_CODE (initial_value) == CONSTRUCTOR
6898 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6900 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6901 tree value = VEC_index (constructor_elt, v, 0).value;
6903 if (TREE_CODE (value) == STRING_CST
6904 && VEC_length (constructor_elt, v) == 1)
6905 initial_value = value;
6908 /* If any of the elements are parameter packs, we can't actually
6909 complete this type now because the array size is dependent. */
6910 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6912 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6915 if (PACK_EXPANSION_P (value))
6921 failure = complete_array_type (ptype, initial_value, do_default);
6923 /* We can create the array before the element type is complete, which
6924 means that we didn't have these two bits set in the original type
6925 either. In completing the type, we are expected to propagate these
6926 bits. See also complete_type which does the same thing for arrays
6929 if (TYPE_DOMAIN (type))
6931 elt_type = TREE_TYPE (type);
6932 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6933 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6934 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6940 /* As above, but either give an error or reject zero-size arrays, depending
6944 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6945 bool do_default, tsubst_flags_t complain)
6948 bool sfinae = !(complain & tf_error);
6949 /* In SFINAE context we can't be lenient about zero-size arrays. */
6952 failure = cp_complete_array_type (ptype, initial_value, do_default);
6958 /* Not an error. */;
6959 else if (failure == 1)
6960 error ("initializer fails to determine size of %qT", *ptype);
6961 else if (failure == 2)
6964 error ("array size missing in %qT", *ptype);
6966 else if (failure == 3)
6967 error ("zero-size array %qT", *ptype);
6968 *ptype = error_mark_node;
6973 /* Return zero if something is declared to be a member of type
6974 CTYPE when in the context of CUR_TYPE. STRING is the error
6975 message to print in that case. Otherwise, quietly return 1. */
6978 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6980 if (ctype && ctype != cur_type)
6982 if (flags == DTOR_FLAG)
6983 error ("destructor for alien class %qT cannot be a member", ctype);
6985 error ("constructor for alien class %qT cannot be a member", ctype);
6991 /* Subroutine of `grokdeclarator'. */
6993 /* Generate errors possibly applicable for a given set of specifiers.
6994 This is for ARM $7.1.2. */
6997 bad_specifiers (tree object,
6998 enum bad_spec_place type,
7009 error ("%qD declared as a %<virtual%> variable", object);
7011 error ("%qD declared as an %<inline%> variable", object);
7013 error ("%<const%> and %<volatile%> function specifiers on "
7014 "%qD invalid in variable declaration", object);
7018 error ("%qD declared as a %<virtual%> parameter", object);
7020 error ("%qD declared as an %<inline%> parameter", object);
7022 error ("%<const%> and %<volatile%> function specifiers on "
7023 "%qD invalid in parameter declaration", object);
7027 error ("%qD declared as a %<virtual%> type", object);
7029 error ("%qD declared as an %<inline%> type", object);
7031 error ("%<const%> and %<volatile%> function specifiers on "
7032 "%qD invalid in type declaration", object);
7036 error ("%qD declared as a %<virtual%> field", object);
7038 error ("%qD declared as an %<inline%> field", object);
7040 error ("%<const%> and %<volatile%> function specifiers on "
7041 "%qD invalid in field declaration", object);
7047 error ("%q+D declared as a friend", object);
7049 && (TREE_CODE (object) == TYPE_DECL
7050 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7051 && !TYPE_REFFN_P (TREE_TYPE (object))
7052 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7053 error ("%q+D declared with an exception specification", object);
7056 /* DECL is a member function or static data member and is presently
7057 being defined. Check that the definition is taking place in a
7061 check_class_member_definition_namespace (tree decl)
7063 /* These checks only apply to member functions and static data
7065 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7066 || TREE_CODE (decl) == VAR_DECL);
7067 /* We check for problems with specializations in pt.c in
7068 check_specialization_namespace, where we can issue better
7070 if (processing_specialization)
7072 /* There are no restrictions on the placement of
7073 explicit instantiations. */
7074 if (processing_explicit_instantiation)
7078 A member function definition that appears outside of the
7079 class definition shall appear in a namespace scope enclosing
7080 the class definition.
7084 The definition for a static data member shall appear in a
7085 namespace scope enclosing the member's class definition. */
7086 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7087 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7088 decl, DECL_CONTEXT (decl));
7091 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7092 METHOD_TYPE for a non-static member function; QUALS are the
7093 cv-qualifiers that apply to the function. */
7096 build_this_parm (tree type, cp_cv_quals quals)
7101 cp_cv_quals this_quals;
7103 if (CLASS_TYPE_P (type))
7106 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7107 this_type = build_pointer_type (this_type);
7110 this_type = type_of_this_parm (type);
7111 /* The `this' parameter is implicitly `const'; it cannot be
7113 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7114 qual_type = cp_build_qualified_type (this_type, this_quals);
7115 parm = build_artificial_parm (this_identifier, qual_type);
7116 cp_apply_type_quals_to_decl (this_quals, parm);
7120 /* DECL is a static member function. Complain if it was declared
7121 with function-cv-quals. */
7124 check_static_quals (tree decl, cp_cv_quals quals)
7126 if (quals != TYPE_UNQUALIFIED)
7127 error ("static member function %q#D declared with type qualifiers",
7131 /* CTYPE is class type, or null if non-class.
7132 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7134 DECLARATOR is the function's name.
7135 PARMS is a chain of PARM_DECLs for the function.
7136 VIRTUALP is truthvalue of whether the function is virtual or not.
7137 FLAGS are to be passed through to `grokclassfn'.
7138 QUALS are qualifiers indicating whether the function is `const'
7140 RAISES is a list of exceptions that this function can raise.
7141 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7142 not look, and -1 if we should not call `grokclassfn' at all.
7144 SFK is the kind of special function (if any) for the new function.
7146 Returns `NULL_TREE' if something goes wrong, after issuing
7147 applicable error messages. */
7150 grokfndecl (tree ctype,
7154 tree orig_declarator,
7156 enum overload_flags flags,
7163 special_function_kind sfk,
7168 location_t location)
7171 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7175 type = build_exception_variant (type, raises);
7177 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7179 /* If we have an explicit location, use it, otherwise use whatever
7180 build_lang_decl used (probably input_location). */
7181 if (location != UNKNOWN_LOCATION)
7182 DECL_SOURCE_LOCATION (decl) = location;
7184 if (TREE_CODE (type) == METHOD_TYPE)
7187 parm = build_this_parm (type, quals);
7188 DECL_CHAIN (parm) = parms;
7191 DECL_ARGUMENTS (decl) = parms;
7192 for (t = parms; t; t = DECL_CHAIN (t))
7193 DECL_CONTEXT (t) = decl;
7194 /* Propagate volatile out from type to decl. */
7195 if (TYPE_VOLATILE (type))
7196 TREE_THIS_VOLATILE (decl) = 1;
7198 /* Setup decl according to sfk. */
7201 case sfk_constructor:
7202 case sfk_copy_constructor:
7203 case sfk_move_constructor:
7204 DECL_CONSTRUCTOR_P (decl) = 1;
7206 case sfk_destructor:
7207 DECL_DESTRUCTOR_P (decl) = 1;
7213 /* If pointers to member functions use the least significant bit to
7214 indicate whether a function is virtual, ensure a pointer
7215 to this function will have that bit clear. */
7216 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7217 && TREE_CODE (type) == METHOD_TYPE
7218 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7219 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7222 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7226 ("defining explicit specialization %qD in friend declaration",
7230 tree fns = TREE_OPERAND (orig_declarator, 0);
7231 tree args = TREE_OPERAND (orig_declarator, 1);
7233 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7235 /* Something like `template <class T> friend void f<T>()'. */
7236 error ("invalid use of template-id %qD in declaration "
7237 "of primary template",
7243 /* A friend declaration of the form friend void f<>(). Record
7244 the information in the TEMPLATE_ID_EXPR. */
7245 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7247 if (TREE_CODE (fns) == COMPONENT_REF)
7249 /* Due to bison parser ickiness, we will have already looked
7250 up an operator_name or PFUNCNAME within the current class
7251 (see template_id in parse.y). If the current class contains
7252 such a name, we'll get a COMPONENT_REF here. Undo that. */
7254 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7255 == current_class_type);
7256 fns = TREE_OPERAND (fns, 1);
7258 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7259 || TREE_CODE (fns) == OVERLOAD);
7260 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7262 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7263 if (TREE_PURPOSE (t)
7264 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7266 error ("default arguments are not allowed in declaration "
7267 "of friend template specialization %qD",
7274 error ("%<inline%> is not allowed in declaration of friend "
7275 "template specialization %qD",
7282 /* If this decl has namespace scope, set that up. */
7284 set_decl_namespace (decl, in_namespace, friendp);
7286 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7288 /* `main' and builtins have implicit 'C' linkage. */
7289 if ((MAIN_NAME_P (declarator)
7290 || (IDENTIFIER_LENGTH (declarator) > 10
7291 && IDENTIFIER_POINTER (declarator)[0] == '_'
7292 && IDENTIFIER_POINTER (declarator)[1] == '_'
7293 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7294 && current_lang_name == lang_name_cplusplus
7295 && ctype == NULL_TREE
7296 && DECL_FILE_SCOPE_P (decl))
7297 SET_DECL_LANGUAGE (decl, lang_c);
7299 /* Should probably propagate const out from type to decl I bet (mrs). */
7302 DECL_STATIC_FUNCTION_P (decl) = 1;
7303 DECL_CONTEXT (decl) = ctype;
7308 DECL_CONTEXT (decl) = ctype;
7310 check_class_member_definition_namespace (decl);
7313 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7315 if (processing_template_decl)
7316 error ("cannot declare %<::main%> to be a template");
7318 error ("cannot declare %<::main%> to be inline");
7320 error ("cannot declare %<::main%> to be static");
7325 /* Members of anonymous types and local classes have no linkage; make
7326 them internal. If a typedef is made later, this will be changed. */
7327 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7328 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7331 if (publicp && cxx_dialect == cxx98)
7333 /* [basic.link]: A name with no linkage (notably, the name of a class
7334 or enumeration declared in a local scope) shall not be used to
7335 declare an entity with linkage.
7337 DR 757 relaxes this restriction for C++0x. */
7338 t = no_linkage_check (TREE_TYPE (decl),
7339 /*relaxed_p=*/false);
7342 if (TYPE_ANONYMOUS_P (t))
7344 if (DECL_EXTERN_C_P (decl))
7345 /* Allow this; it's pretty common in C. */;
7348 permerror (input_location, "anonymous type with no linkage "
7349 "used to declare function %q#D with linkage",
7351 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7352 permerror (input_location, "%q+#D does not refer to the unqualified "
7353 "type, so it is not used for linkage",
7358 permerror (input_location, "type %qT with no linkage used to "
7359 "declare function %q#D with linkage", t, decl);
7363 TREE_PUBLIC (decl) = publicp;
7366 DECL_INTERFACE_KNOWN (decl) = 1;
7367 DECL_NOT_REALLY_EXTERN (decl) = 1;
7370 /* If the declaration was declared inline, mark it as such. */
7372 DECL_DECLARED_INLINE_P (decl) = 1;
7374 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7376 DECL_EXTERNAL (decl) = 1;
7377 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7380 ? G_("static member function %qD cannot have cv-qualifier")
7381 : G_("non-member function %qD cannot have cv-qualifier"),
7383 quals = TYPE_UNQUALIFIED;
7386 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7387 && !grok_op_properties (decl, /*complain=*/true))
7389 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7391 bool long_long_unsigned_p;
7393 const char *suffix = NULL;
7394 /* [over.literal]/6: Literal operators shall not have C linkage. */
7395 if (DECL_LANGUAGE (decl) == lang_c)
7397 error ("literal operator with C linkage");
7401 if (DECL_NAMESPACE_SCOPE_P (decl))
7403 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7406 error ("%qD has invalid argument list", decl);
7410 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7411 if (long_long_unsigned_p)
7413 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7414 warning (0, "integer suffix %<%s%>"
7415 " shadowed by implementation", suffix);
7417 else if (long_double_p)
7419 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7420 warning (0, "floating point suffix %<%s%>"
7421 " shadowed by implementation", suffix);
7426 error ("%qD must be a non-member function", decl);
7432 /* Make the init_value nonzero so pushdecl knows this is not
7433 tentative. error_mark_node is replaced later with the BLOCK. */
7434 DECL_INITIAL (decl) = error_mark_node;
7436 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7437 TREE_NOTHROW (decl) = 1;
7439 /* Caller will do the rest of this. */
7443 if (ctype != NULL_TREE)
7444 grokclassfn (ctype, decl, flags);
7447 if (cxx_dialect >= cxx0x
7448 && DECL_DESTRUCTOR_P (decl)
7449 && !TYPE_BEING_DEFINED (DECL_CONTEXT (decl))
7450 && !processing_template_decl)
7451 deduce_noexcept_on_destructor (decl);
7453 decl = check_explicit_specialization (orig_declarator, decl,
7456 4 * (friendp != 0));
7457 if (decl == error_mark_node)
7460 if (DECL_STATIC_FUNCTION_P (decl))
7461 check_static_quals (decl, quals);
7465 cplus_decl_attributes (&decl, *attrlist, 0);
7466 *attrlist = NULL_TREE;
7469 /* Check main's type after attributes have been applied. */
7470 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7472 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7475 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7477 error ("%<::main%> must return %<int%>");
7478 newtype = build_function_type (integer_type_node, oldtypeargs);
7479 TREE_TYPE (decl) = newtype;
7482 check_main_parameter_types (decl);
7485 if (ctype != NULL_TREE
7486 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7489 tree old_decl = check_classfn (ctype, decl,
7490 (processing_template_decl
7491 > template_class_depth (ctype))
7492 ? current_template_parms
7495 if (old_decl == error_mark_node)
7503 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7504 /* Because grokfndecl is always supposed to return a
7505 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7506 here. We depend on our callers to figure out that its
7507 really a template that's being returned. */
7508 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7510 if (DECL_STATIC_FUNCTION_P (old_decl)
7511 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7513 /* Remove the `this' parm added by grokclassfn. */
7514 revert_static_member_fn (decl);
7515 check_static_quals (decl, quals);
7517 if (DECL_ARTIFICIAL (old_decl))
7519 error ("definition of implicitly-declared %qD", old_decl);
7522 else if (DECL_DEFAULTED_FN (old_decl))
7524 error ("definition of explicitly-defaulted %q+D", decl);
7525 error ("%q+#D explicitly defaulted here", old_decl);
7529 /* Since we've smashed OLD_DECL to its
7530 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7531 if (TREE_CODE (decl) == TEMPLATE_DECL)
7532 decl = DECL_TEMPLATE_RESULT (decl);
7534 /* Attempt to merge the declarations. This can fail, in
7535 the case of some invalid specialization declarations. */
7536 pushed_scope = push_scope (ctype);
7537 ok = duplicate_decls (decl, old_decl, friendp);
7539 pop_scope (pushed_scope);
7542 error ("no %q#D member function declared in class %qT",
7550 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7553 if (ctype == NULL_TREE || check)
7557 DECL_VIRTUAL_P (decl) = 1;
7562 /* decl is a FUNCTION_DECL.
7563 specifiers are the parsed virt-specifiers.
7565 Set flags to reflect the virt-specifiers.
7570 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7572 if (decl == NULL_TREE)
7574 if (specifiers & VIRT_SPEC_OVERRIDE)
7575 DECL_OVERRIDE_P (decl) = 1;
7576 if (specifiers & VIRT_SPEC_FINAL)
7577 DECL_FINAL_P (decl) = 1;
7581 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7582 the linkage that DECL will receive in the object file. */
7585 set_linkage_for_static_data_member (tree decl)
7587 /* A static data member always has static storage duration and
7588 external linkage. Note that static data members are forbidden in
7589 local classes -- the only situation in which a class has
7590 non-external linkage. */
7591 TREE_PUBLIC (decl) = 1;
7592 TREE_STATIC (decl) = 1;
7593 /* For non-template classes, static data members are always put
7594 out in exactly those files where they are defined, just as
7595 with ordinary namespace-scope variables. */
7596 if (!processing_template_decl)
7597 DECL_INTERFACE_KNOWN (decl) = 1;
7600 /* Create a VAR_DECL named NAME with the indicated TYPE.
7602 If SCOPE is non-NULL, it is the class type or namespace containing
7603 the variable. If SCOPE is NULL, the variable should is created in
7604 the innermost enclosings scope. */
7607 grokvardecl (tree type,
7609 const cp_decl_specifier_seq *declspecs,
7615 tree explicit_scope;
7617 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7619 /* Compute the scope in which to place the variable, but remember
7620 whether or not that scope was explicitly specified by the user. */
7621 explicit_scope = scope;
7624 /* An explicit "extern" specifier indicates a namespace-scope
7626 if (declspecs->storage_class == sc_extern)
7627 scope = current_decl_namespace ();
7628 else if (!at_function_scope_p ())
7629 scope = current_scope ();
7633 && (/* If the variable is a namespace-scope variable declared in a
7634 template, we need DECL_LANG_SPECIFIC. */
7635 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7636 /* Similarly for namespace-scope variables with language linkage
7638 || (TREE_CODE (scope) == NAMESPACE_DECL
7639 && current_lang_name != lang_name_cplusplus)
7640 /* Similarly for static data members. */
7642 decl = build_lang_decl (VAR_DECL, name, type);
7644 decl = build_decl (input_location, VAR_DECL, name, type);
7646 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7647 set_decl_namespace (decl, explicit_scope, 0);
7649 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7651 if (declspecs->storage_class == sc_extern)
7653 DECL_THIS_EXTERN (decl) = 1;
7654 DECL_EXTERNAL (decl) = !initialized;
7657 if (DECL_CLASS_SCOPE_P (decl))
7659 set_linkage_for_static_data_member (decl);
7660 /* This function is only called with out-of-class definitions. */
7661 DECL_EXTERNAL (decl) = 0;
7662 check_class_member_definition_namespace (decl);
7664 /* At top level, either `static' or no s.c. makes a definition
7665 (perhaps tentative), and absence of `static' makes it public. */
7666 else if (toplevel_bindings_p ())
7668 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7669 && (DECL_THIS_EXTERN (decl) || ! constp));
7670 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7672 /* Not at top level, only `static' makes a static definition. */
7675 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7676 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7679 if (decl_spec_seq_has_spec_p (declspecs, ds_thread))
7680 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7682 /* If the type of the decl has no linkage, make sure that we'll
7683 notice that in mark_used. */
7684 if (cxx_dialect > cxx98
7685 && decl_linkage (decl) != lk_none
7686 && DECL_LANG_SPECIFIC (decl) == NULL
7687 && !DECL_EXTERN_C_P (decl)
7688 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7689 retrofit_lang_decl (decl);
7691 if (TREE_PUBLIC (decl))
7693 /* [basic.link]: A name with no linkage (notably, the name of a class
7694 or enumeration declared in a local scope) shall not be used to
7695 declare an entity with linkage.
7697 DR 757 relaxes this restriction for C++0x. */
7698 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7699 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7702 if (TYPE_ANONYMOUS_P (t))
7704 if (DECL_EXTERN_C_P (decl))
7705 /* Allow this; it's pretty common in C. */
7709 /* DRs 132, 319 and 389 seem to indicate types with
7710 no linkage can only be used to declare extern "C"
7711 entities. Since it's not always an error in the
7712 ISO C++ 90 Standard, we only issue a warning. */
7713 warning (0, "anonymous type with no linkage used to declare "
7714 "variable %q#D with linkage", decl);
7715 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7716 warning (0, "%q+#D does not refer to the unqualified "
7717 "type, so it is not used for linkage",
7722 warning (0, "type %qT with no linkage used to declare variable "
7723 "%q#D with linkage", t, decl);
7727 DECL_INTERFACE_KNOWN (decl) = 1;
7732 /* Create and return a canonical pointer to member function type, for
7733 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7736 build_ptrmemfunc_type (tree type)
7740 tree unqualified_variant = NULL_TREE;
7742 if (type == error_mark_node)
7745 /* If a canonical type already exists for this type, use it. We use
7746 this method instead of type_hash_canon, because it only does a
7747 simple equality check on the list of field members. */
7749 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7752 /* Make sure that we always have the unqualified pointer-to-member
7754 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7756 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7758 t = make_class_type (RECORD_TYPE);
7759 xref_basetypes (t, NULL_TREE);
7761 /* Let the front end know this is a pointer to member function... */
7762 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7763 /* ... and not really a class type. */
7764 SET_CLASS_TYPE_P (t, 0);
7766 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7769 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7771 DECL_CHAIN (field) = fields;
7774 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7776 /* Zap out the name so that the back end will give us the debugging
7777 information for this anonymous RECORD_TYPE. */
7778 TYPE_NAME (t) = NULL_TREE;
7780 /* If this is not the unqualified form of this pointer-to-member
7781 type, set the TYPE_MAIN_VARIANT for this type to be the
7782 unqualified type. Since they are actually RECORD_TYPEs that are
7783 not variants of each other, we must do this manually.
7784 As we just built a new type there is no need to do yet another copy. */
7785 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7787 int type_quals = cp_type_quals (type);
7788 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7789 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7790 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7791 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7792 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7793 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7794 TREE_TYPE (TYPE_BINFO (t)) = t;
7797 /* Cache this pointer-to-member type so that we can find it again
7799 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7801 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7802 SET_TYPE_STRUCTURAL_EQUALITY (t);
7803 else if (TYPE_CANONICAL (type) != type)
7804 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7809 /* Create and return a pointer to data member type. */
7812 build_ptrmem_type (tree class_type, tree member_type)
7814 if (TREE_CODE (member_type) == METHOD_TYPE)
7816 cp_cv_quals quals = type_memfn_quals (member_type);
7817 member_type = build_memfn_type (member_type, class_type, quals);
7818 return build_ptrmemfunc_type (build_pointer_type (member_type));
7822 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7823 return build_offset_type (class_type, member_type);
7827 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7828 Check to see that the definition is valid. Issue appropriate error
7829 messages. Return 1 if the definition is particularly bad, or 0
7833 check_static_variable_definition (tree decl, tree type)
7835 /* Can't check yet if we don't know the type. */
7836 if (dependent_type_p (type))
7838 /* If DECL is declared constexpr, we'll do the appropriate checks
7839 in check_initializer. */
7840 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7842 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7844 if (!COMPLETE_TYPE_P (type))
7845 error ("in-class initialization of static data member %q#D of "
7846 "incomplete type", decl);
7847 else if (literal_type_p (type))
7848 permerror (input_location,
7849 "%<constexpr%> needed for in-class initialization of "
7850 "static data member %q#D of non-integral type", decl);
7852 error ("in-class initialization of static data member %q#D of "
7853 "non-literal type", decl);
7857 /* Motion 10 at San Diego: If a static const integral data member is
7858 initialized with an integral constant expression, the initializer
7859 may appear either in the declaration (within the class), or in
7860 the definition, but not both. If it appears in the class, the
7861 member is a member constant. The file-scope definition is always
7863 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7865 error ("invalid in-class initialization of static data member "
7866 "of non-integral type %qT",
7870 else if (!CP_TYPE_CONST_P (type))
7871 error ("ISO C++ forbids in-class initialization of non-const "
7872 "static member %qD",
7874 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7875 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids initialization of member constant "
7876 "%qD of non-integral type %qT", decl, type);
7881 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7882 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7883 expressions out into temporary variables so that walk_tree doesn't
7884 step into them (c++/15764). */
7887 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7889 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7890 tree expr = *expr_p;
7891 if (TREE_CODE (expr) == SAVE_EXPR)
7893 tree op = TREE_OPERAND (expr, 0);
7894 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7895 if (TREE_SIDE_EFFECTS (op))
7896 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7899 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7904 /* Entry point for the above. */
7907 stabilize_vla_size (tree size)
7909 struct pointer_set_t *pset = pointer_set_create ();
7910 /* Break out any function calls into temporary variables. */
7911 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7914 /* Given the SIZE (i.e., number of elements) in an array, compute an
7915 appropriate index type for the array. If non-NULL, NAME is the
7916 name of the thing being declared. */
7919 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7923 tree abi_1_itype = NULL_TREE;
7925 if (error_operand_p (size))
7926 return error_mark_node;
7928 if (!type_dependent_expression_p (size))
7930 tree type = TREE_TYPE (size);
7932 mark_rvalue_use (size);
7934 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7935 && TREE_SIDE_EFFECTS (size))
7936 /* In C++98, we mark a non-constant array bound with a magic
7937 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7940 size = fold_non_dependent_expr (size);
7942 if (CLASS_TYPE_P (type)
7943 && CLASSTYPE_LITERAL_P (type))
7945 size = build_expr_type_conversion (WANT_INT, size, true);
7948 if (!(complain & tf_error))
7949 return error_mark_node;
7951 error ("size of array %qD has non-integral type %qT",
7954 error ("size of array has non-integral type %qT", type);
7955 size = integer_one_node;
7957 if (size == error_mark_node)
7958 return error_mark_node;
7959 type = TREE_TYPE (size);
7960 /* We didn't support this case in GCC 3.2, so don't bother
7961 trying to model it now in ABI v1. */
7962 abi_1_itype = error_mark_node;
7965 size = maybe_constant_value (size);
7966 if (!TREE_CONSTANT (size))
7970 if (error_operand_p (size))
7971 return error_mark_node;
7973 /* The array bound must be an integer type. */
7974 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7976 if (!(complain & tf_error))
7977 return error_mark_node;
7979 error ("size of array %qD has non-integral type %qT", name, type);
7981 error ("size of array has non-integral type %qT", type);
7982 size = integer_one_node;
7983 type = TREE_TYPE (size);
7987 /* A type is dependent if it is...an array type constructed from any
7988 dependent type or whose size is specified by a constant expression
7989 that is value-dependent. */
7990 /* We can only call value_dependent_expression_p on integral constant
7991 expressions; treat non-constant expressions as dependent, too. */
7992 if (processing_template_decl
7993 && (type_dependent_expression_p (size)
7994 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7996 /* We cannot do any checking for a SIZE that isn't known to be
7997 constant. Just build the index type and mark that it requires
7998 structural equality checks. */
7999 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8000 size, integer_one_node));
8001 TYPE_DEPENDENT_P (itype) = 1;
8002 TYPE_DEPENDENT_P_VALID (itype) = 1;
8003 SET_TYPE_STRUCTURAL_EQUALITY (itype);
8007 if (!abi_version_at_least (2) && processing_template_decl
8008 && abi_1_itype == NULL_TREE)
8009 /* For abi-1, we handled all instances in templates the same way,
8010 even when they were non-dependent. This affects the manglings
8011 produced. So, we do the normal checking for non-dependent
8012 sizes, but at the end we'll return the same type that abi-1
8013 would have, but with TYPE_CANONICAL set to the "right"
8014 value that the current ABI would provide. */
8015 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8016 osize, integer_one_node));
8018 /* Normally, the array-bound will be a constant. */
8019 if (TREE_CODE (size) == INTEGER_CST)
8021 /* Check to see if the array bound overflowed. Make that an
8022 error, no matter how generous we're being. */
8023 constant_expression_error (size);
8025 /* An array must have a positive number of elements. */
8026 if (INT_CST_LT (size, integer_zero_node))
8028 if (!(complain & tf_error))
8029 return error_mark_node;
8031 error ("size of array %qD is negative", name);
8033 error ("size of array is negative");
8034 size = integer_one_node;
8036 /* As an extension we allow zero-sized arrays. */
8037 else if (integer_zerop (size))
8039 if (!(complain & tf_error))
8040 /* We must fail if performing argument deduction (as
8041 indicated by the state of complain), so that
8042 another substitution can be found. */
8043 return error_mark_node;
8044 else if (in_system_header)
8045 /* Allow them in system headers because glibc uses them. */;
8047 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array %qD", name);
8049 pedwarn (input_location, OPT_Wpedantic, "ISO C++ forbids zero-size array");
8052 else if (TREE_CONSTANT (size)
8053 /* We don't allow VLAs at non-function scopes, or during
8054 tentative template substitution. */
8055 || !at_function_scope_p () || !(complain & tf_error))
8057 if (!(complain & tf_error))
8058 return error_mark_node;
8059 /* `(int) &fn' is not a valid array bound. */
8061 error ("size of array %qD is not an integral constant-expression",
8064 error ("size of array is not an integral constant-expression");
8065 size = integer_one_node;
8067 else if (pedantic && warn_vla != 0)
8070 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8072 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8074 else if (warn_vla > 0)
8078 "variable length array %qD is used", name);
8081 "variable length array is used");
8084 if (processing_template_decl && !TREE_CONSTANT (size))
8085 /* A variable sized array. */
8086 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8089 HOST_WIDE_INT saved_processing_template_decl;
8091 /* Compute the index of the largest element in the array. It is
8092 one less than the number of elements in the array. We save
8093 and restore PROCESSING_TEMPLATE_DECL so that computations in
8094 cp_build_binary_op will be appropriately folded. */
8095 saved_processing_template_decl = processing_template_decl;
8096 processing_template_decl = 0;
8097 itype = cp_build_binary_op (input_location,
8099 cp_convert (ssizetype, size, complain),
8100 cp_convert (ssizetype, integer_one_node,
8103 itype = fold (itype);
8104 processing_template_decl = saved_processing_template_decl;
8106 if (!TREE_CONSTANT (itype))
8107 /* A variable sized array. */
8108 itype = variable_size (itype);
8109 /* Make sure that there was no overflow when creating to a signed
8110 index type. (For example, on a 32-bit machine, an array with
8111 size 2^32 - 1 is too big.) */
8112 else if (TREE_CODE (itype) == INTEGER_CST
8113 && TREE_OVERFLOW (itype))
8115 if (!(complain & tf_error))
8116 return error_mark_node;
8117 error ("overflow in array dimension");
8118 TREE_OVERFLOW (itype) = 0;
8122 /* Create and return the appropriate index type. */
8123 if (abi_1_itype && abi_1_itype != error_mark_node)
8125 tree t = build_index_type (itype);
8126 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8127 itype = abi_1_itype;
8130 itype = build_index_type (itype);
8132 /* If the index type were dependent, we would have returned early, so
8133 remember that it isn't. */
8134 TYPE_DEPENDENT_P (itype) = 0;
8135 TYPE_DEPENDENT_P_VALID (itype) = 1;
8139 /* Returns the scope (if any) in which the entity declared by
8140 DECLARATOR will be located. If the entity was declared with an
8141 unqualified name, NULL_TREE is returned. */
8144 get_scope_of_declarator (const cp_declarator *declarator)
8146 while (declarator && declarator->kind != cdk_id)
8147 declarator = declarator->declarator;
8149 /* If the declarator-id is a SCOPE_REF, the scope in which the
8150 declaration occurs is the first operand. */
8152 && declarator->u.id.qualifying_scope)
8153 return declarator->u.id.qualifying_scope;
8155 /* Otherwise, the declarator is not a qualified name; the entity will
8156 be declared in the current scope. */
8160 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8161 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8165 create_array_type_for_decl (tree name, tree type, tree size)
8167 tree itype = NULL_TREE;
8169 /* If things have already gone awry, bail now. */
8170 if (type == error_mark_node || size == error_mark_node)
8171 return error_mark_node;
8173 /* 8.3.4/1: If the type of the identifier of D contains the auto
8174 type-specifier, the program is ill-formed. */
8175 if (pedantic && type_uses_auto (type))
8176 pedwarn (input_location, OPT_Wpedantic,
8177 "declaration of %qD as array of %<auto%>", name);
8179 /* If there are some types which cannot be array elements,
8180 issue an error-message and return. */
8181 switch (TREE_CODE (type))
8185 error ("declaration of %qD as array of void", name);
8187 error ("creating array of void");
8188 return error_mark_node;
8192 error ("declaration of %qD as array of functions", name);
8194 error ("creating array of functions");
8195 return error_mark_node;
8197 case REFERENCE_TYPE:
8199 error ("declaration of %qD as array of references", name);
8201 error ("creating array of references");
8202 return error_mark_node;
8206 error ("declaration of %qD as array of function members", name);
8208 error ("creating array of function members");
8209 return error_mark_node;
8217 The constant expressions that specify the bounds of the arrays
8218 can be omitted only for the first member of the sequence. */
8219 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8222 error ("declaration of %qD as multidimensional array must "
8223 "have bounds for all dimensions except the first",
8226 error ("multidimensional array must have bounds for all "
8227 "dimensions except the first");
8229 return error_mark_node;
8232 /* Figure out the index type for the array. */
8234 itype = compute_array_index_type (name, size, tf_warning_or_error);
8237 T is called the array element type; this type shall not be [...] an
8238 abstract class type. */
8239 abstract_virtuals_error (name, type);
8241 return build_cplus_array_type (type, itype);
8244 /* Check that it's OK to declare a function with the indicated TYPE.
8245 SFK indicates the kind of special function (if any) that this
8246 function is. OPTYPE is the type given in a conversion operator
8247 declaration, or the class type for a constructor/destructor.
8248 Returns the actual return type of the function; that
8249 may be different than TYPE if an error occurs, or for certain
8250 special functions. */
8253 check_special_function_return_type (special_function_kind sfk,
8259 case sfk_constructor:
8261 error ("return type specification for constructor invalid");
8263 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8264 type = build_pointer_type (optype);
8266 type = void_type_node;
8269 case sfk_destructor:
8271 error ("return type specification for destructor invalid");
8272 /* We can't use the proper return type here because we run into
8273 problems with ambiguous bases and covariant returns.
8274 Java classes are left unchanged because (void *) isn't a valid
8275 Java type, and we don't want to change the Java ABI. */
8276 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8277 type = build_pointer_type (void_type_node);
8279 type = void_type_node;
8282 case sfk_conversion:
8284 error ("return type specified for %<operator %T%>", optype);
8295 /* A variable or data member (whose unqualified name is IDENTIFIER)
8296 has been declared with the indicated TYPE. If the TYPE is not
8297 acceptable, issue an error message and return a type to use for
8298 error-recovery purposes. */
8301 check_var_type (tree identifier, tree type)
8303 if (VOID_TYPE_P (type))
8306 error ("unnamed variable or field declared void");
8307 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8309 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8310 error ("variable or field %qE declared void", identifier);
8313 error ("variable or field declared void");
8314 type = error_mark_node;
8320 /* Given declspecs and a declarator (abstract or otherwise), determine
8321 the name and type of the object declared and construct a DECL node
8324 DECLSPECS points to the representation of declaration-specifier
8325 sequence that precedes declarator.
8327 DECL_CONTEXT says which syntactic context this declaration is in:
8328 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8329 FUNCDEF for a function definition. Like NORMAL but a few different
8330 error messages in each case. Return value may be zero meaning
8331 this definition is too screwy to try to parse.
8332 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8333 handle member functions (which have FIELD context).
8334 Return value may be zero meaning this definition is too screwy to
8336 PARM for a parameter declaration (either within a function prototype
8337 or before a function body). Make a PARM_DECL, or return void_type_node.
8338 TPARM for a template parameter declaration.
8339 CATCHPARM for a parameter declaration before a catch clause.
8340 TYPENAME if for a typename (in a cast or sizeof).
8341 Don't make a DECL node; just return the ..._TYPE node.
8342 FIELD for a struct or union field; make a FIELD_DECL.
8343 BITFIELD for a field with specified width.
8345 INITIALIZED is as for start_decl.
8347 ATTRLIST is a pointer to the list of attributes, which may be NULL
8348 if there are none; *ATTRLIST may be modified if attributes from inside
8349 the declarator should be applied to the declaration.
8351 When this function is called, scoping variables (such as
8352 CURRENT_CLASS_TYPE) should reflect the scope in which the
8353 declaration occurs, not the scope in which the new declaration will
8354 be placed. For example, on:
8358 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8361 Returns a DECL (if a declarator is present), a TYPE (if there is no
8362 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8366 grokdeclarator (const cp_declarator *declarator,
8367 const cp_decl_specifier_seq *declspecs,
8368 enum decl_context decl_context,
8372 tree type = NULL_TREE;
8374 int explicit_int128 = 0;
8375 int virtualp, explicitp, friendp, inlinep, staticp;
8376 int explicit_int = 0;
8377 int explicit_char = 0;
8378 int defaulted_int = 0;
8379 tree dependent_name = NULL_TREE;
8381 tree typedef_decl = NULL_TREE;
8382 const char *name = NULL;
8383 tree typedef_type = NULL_TREE;
8384 /* True if this declarator is a function definition. */
8385 bool funcdef_flag = false;
8386 cp_declarator_kind innermost_code = cdk_error;
8389 /* See the code below that used this. */
8390 tree decl_attr = NULL_TREE;
8393 /* Keep track of what sort of function is being processed
8394 so that we can warn about default return values, or explicit
8395 return values which do not match prescribed defaults. */
8396 special_function_kind sfk = sfk_none;
8398 tree dname = NULL_TREE;
8399 tree ctor_return_type = NULL_TREE;
8400 enum overload_flags flags = NO_SPECIAL;
8401 /* cv-qualifiers that apply to the declarator, for a declaration of
8402 a member function. */
8403 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8404 /* virt-specifiers that apply to the declarator, for a declaration of
8405 a member function. */
8406 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8407 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8409 tree raises = NULL_TREE;
8410 int template_count = 0;
8411 tree returned_attrs = NULL_TREE;
8412 tree parms = NULL_TREE;
8413 const cp_declarator *id_declarator;
8414 /* The unqualified name of the declarator; either an
8415 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8416 tree unqualified_id;
8417 /* The class type, if any, in which this entity is located,
8418 or NULL_TREE if none. Note that this value may be different from
8419 the current class type; for example if an attempt is made to declare
8420 "A::f" inside "B", this value will be "A". */
8421 tree ctype = current_class_type;
8422 /* The NAMESPACE_DECL for the namespace in which this entity is
8423 located. If an unqualified name is used to declare the entity,
8424 this value will be NULL_TREE, even if the entity is located at
8426 tree in_namespace = NULL_TREE;
8427 cp_storage_class storage_class;
8428 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8429 bool type_was_error_mark_node = false;
8430 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8431 bool template_type_arg = false;
8432 bool template_parm_flag = false;
8433 bool constexpr_p = decl_spec_seq_has_spec_p (declspecs, ds_constexpr);
8436 signed_p = decl_spec_seq_has_spec_p (declspecs, ds_signed);
8437 unsigned_p = decl_spec_seq_has_spec_p (declspecs, ds_unsigned);
8438 short_p = decl_spec_seq_has_spec_p (declspecs, ds_short);
8439 long_p = decl_spec_seq_has_spec_p (declspecs, ds_long);
8440 longlong = decl_spec_seq_has_spec_p (declspecs, ds_long_long);
8441 explicit_int128 = declspecs->explicit_int128_p;
8442 thread_p = decl_spec_seq_has_spec_p (declspecs, ds_thread);
8444 if (decl_context == FUNCDEF)
8445 funcdef_flag = true, decl_context = NORMAL;
8446 else if (decl_context == MEMFUNCDEF)
8447 funcdef_flag = true, decl_context = FIELD;
8448 else if (decl_context == BITFIELD)
8449 bitfield = 1, decl_context = FIELD;
8450 else if (decl_context == TEMPLATE_TYPE_ARG)
8451 template_type_arg = true, decl_context = TYPENAME;
8452 else if (decl_context == TPARM)
8453 template_parm_flag = true, decl_context = PARM;
8455 if (initialized > 1)
8456 funcdef_flag = true;
8458 /* Look inside a declarator for the name being declared
8459 and get it as a string, for an error message. */
8460 for (id_declarator = declarator;
8462 id_declarator = id_declarator->declarator)
8464 if (id_declarator->kind != cdk_id)
8465 innermost_code = id_declarator->kind;
8467 switch (id_declarator->kind)
8470 if (id_declarator->declarator
8471 && id_declarator->declarator->kind == cdk_id)
8473 sfk = id_declarator->declarator->u.id.sfk;
8474 if (sfk == sfk_destructor)
8481 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8482 tree decl = id_declarator->u.id.unqualified_name;
8485 if (qualifying_scope)
8487 if (at_function_scope_p ())
8491 A declarator-id shall not be qualified except
8494 None of the cases are permitted in block
8496 if (qualifying_scope == global_namespace)
8497 error ("invalid use of qualified-name %<::%D%>",
8499 else if (TYPE_P (qualifying_scope))
8500 error ("invalid use of qualified-name %<%T::%D%>",
8501 qualifying_scope, decl);
8503 error ("invalid use of qualified-name %<%D::%D%>",
8504 qualifying_scope, decl);
8505 return error_mark_node;
8507 else if (TYPE_P (qualifying_scope))
8509 ctype = qualifying_scope;
8510 if (!MAYBE_CLASS_TYPE_P (ctype))
8512 error ("%q#T is not a class or a namespace", ctype);
8515 else if (innermost_code != cdk_function
8516 && current_class_type
8517 && !UNIQUELY_DERIVED_FROM_P (ctype,
8518 current_class_type))
8520 error ("type %qT is not derived from type %qT",
8521 ctype, current_class_type);
8522 return error_mark_node;
8525 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8526 in_namespace = qualifying_scope;
8528 switch (TREE_CODE (decl))
8534 if (innermost_code != cdk_function)
8536 error ("declaration of %qD as non-function", decl);
8537 return error_mark_node;
8539 else if (!qualifying_scope
8540 && !(current_class_type && at_class_scope_p ()))
8542 error ("declaration of %qD as non-member", decl);
8543 return error_mark_node;
8546 type = TREE_OPERAND (decl, 0);
8548 type = constructor_name (type);
8549 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8554 case TEMPLATE_ID_EXPR:
8556 tree fns = TREE_OPERAND (decl, 0);
8559 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8561 gcc_assert (is_overloaded_fn (dname));
8562 dname = DECL_NAME (get_first_fn (dname));
8567 case IDENTIFIER_NODE:
8568 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8571 if (C_IS_RESERVED_WORD (dname))
8573 error ("declarator-id missing; using reserved word %qD",
8575 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8577 else if (!IDENTIFIER_TYPENAME_P (dname))
8578 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8581 gcc_assert (flags == NO_SPECIAL);
8582 flags = TYPENAME_FLAG;
8583 ctor_return_type = TREE_TYPE (dname);
8584 sfk = sfk_conversion;
8585 if (is_typename_at_global_scope (dname))
8586 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8588 name = "<invalid operator>";
8605 return error_mark_node;
8610 if (id_declarator->kind == cdk_id)
8616 The declarator in a function-definition shall have the form
8617 D1 ( parameter-declaration-clause) ... */
8618 if (funcdef_flag && innermost_code != cdk_function)
8620 error ("function definition does not declare parameters");
8621 return error_mark_node;
8624 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8625 && innermost_code != cdk_function
8626 && ! (ctype && !declspecs->any_specifiers_p))
8628 error ("declaration of %qD as non-function", dname);
8629 return error_mark_node;
8633 && TREE_CODE (dname) == IDENTIFIER_NODE
8634 && UDLIT_OPER_P (dname)
8635 && innermost_code != cdk_function)
8637 error ("declaration of %qD as non-function", dname);
8638 return error_mark_node;
8641 if (dname && IDENTIFIER_OPNAME_P (dname))
8643 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef))
8645 error ("declaration of %qD as %<typedef%>", dname);
8646 return error_mark_node;
8648 else if (decl_context == PARM || decl_context == CATCHPARM)
8650 error ("declaration of %qD as parameter", dname);
8651 return error_mark_node;
8655 /* Anything declared one level down from the top level
8656 must be one of the parameters of a function
8657 (because the body is at least two levels down). */
8659 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8660 by not allowing C++ class definitions to specify their parameters
8661 with xdecls (must be spec.d in the parmlist).
8663 Since we now wait to push a class scope until we are sure that
8664 we are in a legitimate method context, we must set oldcname
8665 explicitly (since current_class_name is not yet alive).
8667 We also want to avoid calling this a PARM if it is in a namespace. */
8669 if (decl_context == NORMAL && !toplevel_bindings_p ())
8671 cp_binding_level *b = current_binding_level;
8672 current_binding_level = b->level_chain;
8673 if (current_binding_level != 0 && toplevel_bindings_p ())
8674 decl_context = PARM;
8675 current_binding_level = b;
8679 name = decl_context == PARM ? "parameter" : "type name";
8681 if (constexpr_p && decl_spec_seq_has_spec_p (declspecs, ds_typedef))
8683 error ("%<constexpr%> cannot appear in a typedef declaration");
8684 return error_mark_node;
8687 /* If there were multiple types specified in the decl-specifier-seq,
8688 issue an error message. */
8689 if (declspecs->multiple_types_p)
8691 error ("two or more data types in declaration of %qs", name);
8692 return error_mark_node;
8695 if (declspecs->conflicting_specifiers_p)
8697 error ("conflicting specifiers in declaration of %qs", name);
8698 return error_mark_node;
8701 /* Extract the basic type from the decl-specifier-seq. */
8702 type = declspecs->type;
8703 if (type == error_mark_node)
8706 type_was_error_mark_node = true;
8708 /* If the entire declaration is itself tagged as deprecated then
8709 suppress reports of deprecated items. */
8710 if (type && TREE_DEPRECATED (type)
8711 && deprecated_state != DEPRECATED_SUPPRESS)
8712 warn_deprecated_use (type, NULL_TREE);
8713 if (type && TREE_CODE (type) == TYPE_DECL)
8715 typedef_decl = type;
8716 type = TREE_TYPE (typedef_decl);
8717 if (TREE_DEPRECATED (type)
8718 && DECL_ARTIFICIAL (typedef_decl)
8719 && deprecated_state != DEPRECATED_SUPPRESS)
8720 warn_deprecated_use (type, NULL_TREE);
8722 /* No type at all: default to `int', and set DEFAULTED_INT
8723 because it was not a user-defined typedef. */
8724 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8726 /* These imply 'int'. */
8727 type = integer_type_node;
8731 explicit_int = declspecs->explicit_int_p;
8732 explicit_char = declspecs->explicit_char_p;
8735 /* See the code below that used this. */
8737 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8739 typedef_type = type;
8742 if (sfk != sfk_conversion)
8743 ctor_return_type = ctype;
8745 if (sfk != sfk_none)
8746 type = check_special_function_return_type (sfk, type,
8748 else if (type == NULL_TREE)
8754 /* We handle `main' specially here, because 'main () { }' is so
8755 common. With no options, it is allowed. With -Wreturn-type,
8756 it is a warning. It is only an error with -pedantic-errors. */
8757 is_main = (funcdef_flag
8758 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8759 && MAIN_NAME_P (dname)
8760 && ctype == NULL_TREE
8761 && in_namespace == NULL_TREE
8762 && current_namespace == global_namespace);
8764 if (type_was_error_mark_node)
8765 /* We've already issued an error, don't complain more. */;
8766 else if (in_system_header || flag_ms_extensions)
8767 /* Allow it, sigh. */;
8769 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8771 pedwarn (input_location, OPT_Wpedantic,
8772 "ISO C++ forbids declaration of %qs with no type", name);
8774 warning (OPT_Wreturn_type,
8775 "ISO C++ forbids declaration of %qs with no type", name);
8777 type = integer_type_node;
8782 if (explicit_int128)
8784 if (int128_integer_type_node == NULL_TREE)
8786 error ("%<__int128%> is not supported by this target");
8787 explicit_int128 = false;
8789 else if (pedantic && ! in_system_header)
8790 pedwarn (input_location, OPT_Wpedantic,
8791 "ISO C++ does not support %<__int128%> for %qs", name);
8794 /* Now process the modifiers that were specified
8795 and check for invalid combinations. */
8797 /* Long double is a special combination. */
8798 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8801 type = cp_build_qualified_type (long_double_type_node,
8802 cp_type_quals (type));
8805 /* Check all other uses of type modifiers. */
8807 if (unsigned_p || signed_p || long_p || short_p)
8811 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8812 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8813 else if (signed_p && unsigned_p)
8814 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8815 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8816 error ("%<long long%> invalid for %qs", name);
8817 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8818 error ("%<long%> invalid for %qs", name);
8819 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8820 error ("%<short%> invalid for %qs", name);
8821 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8822 error ("%<long%> or %<short%> invalid for %qs", name);
8823 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8824 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8825 else if ((long_p || short_p) && explicit_char)
8826 error ("%<long%> or %<short%> specified with char for %qs", name);
8827 else if (long_p && short_p)
8828 error ("%<long%> and %<short%> specified together for %qs", name);
8829 else if (type == char16_type_node || type == char32_type_node)
8831 if (signed_p || unsigned_p)
8832 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8833 else if (short_p || long_p)
8834 error ("%<short%> or %<long%> invalid for %qs", name);
8839 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8841 pedwarn (input_location, OPT_Wpedantic,
8842 "long, short, signed or unsigned used invalidly for %qs",
8844 if (flag_pedantic_errors)
8849 /* Discard the type modifiers if they are invalid. */
8860 /* Decide whether an integer type is signed or not.
8861 Optionally treat bitfields as signed by default. */
8865 It is implementation-defined whether a plain (neither
8866 explicitly signed or unsigned) char, short, int, or long
8867 bit-field is signed or unsigned.
8869 Naturally, we extend this to long long as well. Note that
8870 this does not include wchar_t. */
8871 || (bitfield && !flag_signed_bitfields
8873 /* A typedef for plain `int' without `signed' can be
8874 controlled just like plain `int', but a typedef for
8875 `signed int' cannot be so controlled. */
8877 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8878 && TREE_CODE (type) == INTEGER_TYPE
8879 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8881 if (explicit_int128)
8882 type = int128_unsigned_type_node;
8884 type = long_long_unsigned_type_node;
8886 type = long_unsigned_type_node;
8888 type = short_unsigned_type_node;
8889 else if (type == char_type_node)
8890 type = unsigned_char_type_node;
8891 else if (typedef_decl)
8892 type = unsigned_type_for (type);
8894 type = unsigned_type_node;
8896 else if (signed_p && type == char_type_node)
8897 type = signed_char_type_node;
8898 else if (explicit_int128)
8899 type = int128_integer_type_node;
8901 type = long_long_integer_type_node;
8903 type = long_integer_type_node;
8905 type = short_integer_type_node;
8907 if (decl_spec_seq_has_spec_p (declspecs, ds_complex))
8909 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8910 error ("complex invalid for %qs", name);
8911 /* If we just have "complex", it is equivalent to
8912 "complex double", but if any modifiers at all are specified it is
8913 the complex form of TYPE. E.g, "complex short" is
8914 "complex short int". */
8915 else if (defaulted_int && ! longlong && ! explicit_int128
8916 && ! (long_p || short_p || signed_p || unsigned_p))
8917 type = complex_double_type_node;
8918 else if (type == integer_type_node)
8919 type = complex_integer_type_node;
8920 else if (type == float_type_node)
8921 type = complex_float_type_node;
8922 else if (type == double_type_node)
8923 type = complex_double_type_node;
8924 else if (type == long_double_type_node)
8925 type = complex_long_double_type_node;
8927 type = build_complex_type (type);
8930 type_quals = TYPE_UNQUALIFIED;
8931 if (decl_spec_seq_has_spec_p (declspecs, ds_const))
8932 type_quals |= TYPE_QUAL_CONST;
8933 if (decl_spec_seq_has_spec_p (declspecs, ds_volatile))
8934 type_quals |= TYPE_QUAL_VOLATILE;
8935 if (decl_spec_seq_has_spec_p (declspecs, ds_restrict))
8936 type_quals |= TYPE_QUAL_RESTRICT;
8937 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8938 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8941 /* If we're using the injected-class-name to form a compound type or a
8942 declaration, replace it with the underlying class so we don't get
8943 redundant typedefs in the debug output. But if we are returning the
8944 type unchanged, leave it alone so that it's available to
8945 maybe_get_template_decl_from_type_decl. */
8946 if (CLASS_TYPE_P (type)
8947 && DECL_SELF_REFERENCE_P (TYPE_NAME (type))
8948 && type == TREE_TYPE (TYPE_NAME (type))
8949 && (declarator || type_quals))
8950 type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
8952 type_quals |= cp_type_quals (type);
8953 type = cp_build_qualified_type_real
8954 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8955 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8956 /* We might have ignored or rejected some of the qualifiers. */
8957 type_quals = cp_type_quals (type);
8960 inlinep = decl_spec_seq_has_spec_p (declspecs, ds_inline);
8961 virtualp = decl_spec_seq_has_spec_p (declspecs, ds_virtual);
8962 explicitp = decl_spec_seq_has_spec_p (declspecs, ds_explicit);
8964 storage_class = declspecs->storage_class;
8965 if (storage_class == sc_static)
8966 staticp = 1 + (decl_context == FIELD);
8968 if (virtualp && staticp == 2)
8970 error ("member %qD cannot be declared both virtual and static", dname);
8971 storage_class = sc_none;
8974 friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
8976 if (dependent_name && !friendp)
8978 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8979 return error_mark_node;
8982 /* Issue errors about use of storage classes for parameters. */
8983 if (decl_context == PARM)
8985 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef))
8987 error ("typedef declaration invalid in parameter declaration");
8988 return error_mark_node;
8990 else if (template_parm_flag && storage_class != sc_none)
8992 error ("storage class specified for template parameter %qs", name);
8993 return error_mark_node;
8995 else if (storage_class == sc_static
8996 || storage_class == sc_extern
8998 error ("storage class specifiers invalid in parameter declarations");
9000 /* Function parameters cannot be constexpr. If we saw one, moan
9001 and pretend it wasn't there. */
9004 error ("a parameter cannot be declared %<constexpr%>");
9009 /* Give error if `virtual' is used outside of class declaration. */
9011 && (current_class_name == NULL_TREE || decl_context != FIELD))
9013 error ("%<virtual%> outside class declaration");
9017 /* Static anonymous unions are dealt with here. */
9018 if (staticp && decl_context == TYPENAME
9020 && ANON_AGGR_TYPE_P (declspecs->type))
9021 decl_context = FIELD;
9023 /* Warn about storage classes that are invalid for certain
9024 kinds of declarations (parameters, typenames, etc.). */
9027 && storage_class != sc_extern
9028 && storage_class != sc_static)
9029 || decl_spec_seq_has_spec_p (declspecs, ds_typedef)))
9031 error ("multiple storage classes in declaration of %qs", name);
9034 if (decl_context != NORMAL
9035 && ((storage_class != sc_none
9036 && storage_class != sc_mutable)
9039 if ((decl_context == PARM || decl_context == CATCHPARM)
9040 && (storage_class == sc_register
9041 || storage_class == sc_auto))
9043 else if (decl_spec_seq_has_spec_p (declspecs, ds_typedef))
9045 else if (decl_context == FIELD
9046 /* C++ allows static class elements. */
9047 && storage_class == sc_static)
9048 /* C++ also allows inlines and signed and unsigned elements,
9049 but in those cases we don't come in here. */
9053 if (decl_context == FIELD)
9054 error ("storage class specified for %qs", name);
9057 if (decl_context == PARM || decl_context == CATCHPARM)
9058 error ("storage class specified for parameter %qs", name);
9060 error ("storage class specified for typename");
9062 if (storage_class == sc_register
9063 || storage_class == sc_auto
9064 || storage_class == sc_extern
9066 storage_class = sc_none;
9069 else if (storage_class == sc_extern && funcdef_flag
9070 && ! toplevel_bindings_p ())
9071 error ("nested function %qs declared %<extern%>", name);
9072 else if (toplevel_bindings_p ())
9074 if (storage_class == sc_auto)
9075 error ("top-level declaration of %qs specifies %<auto%>", name);
9078 && storage_class != sc_extern
9079 && storage_class != sc_static)
9081 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9086 if (storage_class && friendp)
9088 error ("storage class specifiers invalid in friend function declarations");
9089 storage_class = sc_none;
9094 unqualified_id = NULL_TREE;
9097 unqualified_id = id_declarator->u.id.unqualified_name;
9098 switch (TREE_CODE (unqualified_id))
9101 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9102 if (TYPE_P (unqualified_id))
9103 unqualified_id = constructor_name (unqualified_id);
9106 case IDENTIFIER_NODE:
9107 case TEMPLATE_ID_EXPR:
9115 /* Determine the type of the entity declared by recurring on the
9117 for (; declarator; declarator = declarator->declarator)
9119 const cp_declarator *inner_declarator;
9122 if (type == error_mark_node)
9123 return error_mark_node;
9125 attrs = declarator->attributes;
9131 if (declarator == NULL || declarator->kind == cdk_id)
9132 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9133 if (declarator->kind == cdk_function)
9134 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9135 if (declarator->kind == cdk_array)
9136 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9137 returned_attrs = decl_attributes (&type,
9138 chainon (returned_attrs, attrs),
9142 if (declarator->kind == cdk_id)
9145 inner_declarator = declarator->declarator;
9147 switch (declarator->kind)
9150 type = create_array_type_for_decl (dname, type,
9151 declarator->u.array.bounds);
9159 /* Declaring a function type.
9160 Make sure we have a valid type for the function to return. */
9162 if (type_quals != TYPE_UNQUALIFIED)
9164 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9165 warning (OPT_Wignored_qualifiers,
9166 "type qualifiers ignored on function return type");
9167 /* We now know that the TYPE_QUALS don't apply to the
9168 decl, but to its return type. */
9169 type_quals = TYPE_UNQUALIFIED;
9171 errmsg = targetm.invalid_return_type (type);
9175 type = integer_type_node;
9178 /* Error about some types functions can't return. */
9180 if (TREE_CODE (type) == FUNCTION_TYPE)
9182 error ("%qs declared as function returning a function", name);
9183 return error_mark_node;
9185 if (TREE_CODE (type) == ARRAY_TYPE)
9187 error ("%qs declared as function returning an array", name);
9188 return error_mark_node;
9190 /* When decl_context == NORMAL we emit a better error message
9191 later in abstract_virtuals_error. */
9192 if (decl_context == TYPENAME && ABSTRACT_CLASS_TYPE_P (type))
9193 error ("%qs declared as function returning an abstract "
9194 "class type", name);
9196 /* Pick up type qualifiers which should be applied to `this'. */
9197 memfn_quals = declarator->u.function.qualifiers;
9198 /* Pick up virt-specifiers. */
9199 virt_specifiers = declarator->u.function.virt_specifiers;
9200 /* Pick up the exception specifications. */
9201 raises = declarator->u.function.exception_specification;
9202 /* If the exception-specification is ill-formed, let's pretend
9203 there wasn't one. */
9204 if (raises == error_mark_node)
9207 /* Say it's a definition only for the CALL_EXPR
9208 closest to the identifier. */
9209 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9211 /* Handle a late-specified return type. */
9214 if (type_uses_auto (type))
9216 if (!declarator->u.function.late_return_type)
9218 if (current_class_type
9219 && LAMBDA_TYPE_P (current_class_type))
9220 /* OK for C++11 lambdas. */;
9221 else if (cxx_dialect < cxx1y)
9222 pedwarn (input_location, 0, "%qs function uses "
9223 "%<auto%> type specifier without trailing "
9224 "return type", name);
9226 else if (!is_auto (type))
9228 error ("%qs function with trailing return type has"
9229 " %qT as its type rather than plain %<auto%>",
9231 return error_mark_node;
9234 else if (declarator->u.function.late_return_type)
9236 if (cxx_dialect < cxx0x)
9237 /* Not using maybe_warn_cpp0x because this should
9238 always be an error. */
9239 error ("trailing return type only available with "
9240 "-std=c++11 or -std=gnu++11");
9242 error ("%qs function with trailing return type not "
9243 "declared with %<auto%> type specifier", name);
9244 return error_mark_node;
9247 type = splice_late_return_type
9248 (type, declarator->u.function.late_return_type);
9249 if (type == error_mark_node)
9250 return error_mark_node;
9252 if (ctype == NULL_TREE
9253 && decl_context == FIELD
9255 && (friendp == 0 || dname == current_class_name))
9256 ctype = current_class_type;
9258 if (ctype && (sfk == sfk_constructor
9259 || sfk == sfk_destructor))
9261 /* We are within a class's scope. If our declarator name
9262 is the same as the class name, and we are defining
9263 a function, then it is a constructor/destructor, and
9264 therefore returns a void type. */
9266 /* ISO C++ 12.4/2. A destructor may not be declared
9267 const or volatile. A destructor may not be
9270 ISO C++ 12.1. A constructor may not be declared
9271 const or volatile. A constructor may not be
9272 virtual. A constructor may not be static. */
9274 error ((flags == DTOR_FLAG)
9275 ? G_("destructor cannot be static member function")
9276 : G_("constructor cannot be static member function"));
9279 error ((flags == DTOR_FLAG)
9280 ? G_("destructors may not be cv-qualified")
9281 : G_("constructors may not be cv-qualified"));
9282 memfn_quals = TYPE_UNQUALIFIED;
9285 if (decl_context == FIELD
9286 && !member_function_or_else (ctype,
9289 return error_mark_node;
9291 if (flags != DTOR_FLAG)
9293 /* It's a constructor. */
9298 permerror (input_location, "constructors cannot be declared virtual");
9301 if (decl_context == FIELD
9302 && sfk != sfk_constructor)
9303 return error_mark_node;
9305 if (decl_context == FIELD)
9311 error ("can%'t initialize friend function %qs", name);
9314 /* Cannot be both friend and virtual. */
9315 error ("virtual functions cannot be friends");
9318 if (decl_context == NORMAL)
9319 error ("friend declaration not in class definition");
9320 if (current_function_decl && funcdef_flag)
9321 error ("can%'t define friend function %qs in a local "
9325 else if (ctype && sfk == sfk_conversion)
9329 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9334 arg_types = grokparms (declarator->u.function.parameters,
9337 if (inner_declarator
9338 && inner_declarator->kind == cdk_id
9339 && inner_declarator->u.id.sfk == sfk_destructor
9340 && arg_types != void_list_node)
9342 error ("destructors may not have parameters");
9343 arg_types = void_list_node;
9347 type = build_function_type (type, arg_types);
9354 /* Filter out pointers-to-references and references-to-references.
9355 We can get these if a TYPE_DECL is used. */
9357 if (TREE_CODE (type) == REFERENCE_TYPE)
9359 if (declarator->kind != cdk_reference)
9361 error ("cannot declare pointer to %q#T", type);
9362 type = TREE_TYPE (type);
9365 /* In C++0x, we allow reference to reference declarations
9366 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9367 and template type arguments [14.3.1/4 temp.arg.type]. The
9368 check for direct reference to reference declarations, which
9369 are still forbidden, occurs below. Reasoning behind the change
9370 can be found in DR106, DR540, and the rvalue reference
9372 else if (cxx_dialect == cxx98)
9374 error ("cannot declare reference to %q#T", type);
9375 type = TREE_TYPE (type);
9378 else if (VOID_TYPE_P (type))
9380 if (declarator->kind == cdk_reference)
9381 error ("cannot declare reference to %q#T", type);
9382 else if (declarator->kind == cdk_ptrmem)
9383 error ("cannot declare pointer to %q#T member", type);
9386 /* We now know that the TYPE_QUALS don't apply to the decl,
9387 but to the target of the pointer. */
9388 type_quals = TYPE_UNQUALIFIED;
9390 if (declarator->kind == cdk_ptrmem
9391 && (TREE_CODE (type) == FUNCTION_TYPE
9392 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9394 memfn_quals |= type_memfn_quals (type);
9395 type = build_memfn_type (type,
9396 declarator->u.pointer.class_type,
9398 if (type == error_mark_node)
9399 return error_mark_node;
9400 memfn_quals = TYPE_UNQUALIFIED;
9403 if (TREE_CODE (type) == FUNCTION_TYPE
9404 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9405 error (declarator->kind == cdk_reference
9406 ? G_("cannot declare reference to qualified function type %qT")
9407 : G_("cannot declare pointer to qualified function type %qT"),
9410 /* When the pointed-to type involves components of variable size,
9411 care must be taken to ensure that the size evaluation code is
9412 emitted early enough to dominate all the possible later uses
9413 and late enough for the variables on which it depends to have
9416 This is expected to happen automatically when the pointed-to
9417 type has a name/declaration of it's own, but special attention
9418 is required if the type is anonymous.
9420 We handle the NORMAL and FIELD contexts here by inserting a
9421 dummy statement that just evaluates the size at a safe point
9422 and ensures it is not deferred until e.g. within a deeper
9423 conditional context (c++/43555).
9425 We expect nothing to be needed here for PARM or TYPENAME.
9426 Evaluating the size at this point for TYPENAME would
9427 actually be incorrect, as we might be in the middle of an
9428 expression with side effects on the pointed-to type size
9429 "arguments" prior to the pointer declaration point and the
9430 size evaluation could end up prior to the side effects. */
9432 if (!TYPE_NAME (type)
9433 && (decl_context == NORMAL || decl_context == FIELD)
9434 && at_function_scope_p ()
9435 && variably_modified_type_p (type, NULL_TREE))
9437 /* First break out any side-effects. */
9438 stabilize_vla_size (TYPE_SIZE (type));
9439 /* And then force evaluation of the SAVE_EXPR. */
9440 finish_expr_stmt (TYPE_SIZE (type));
9443 if (declarator->kind == cdk_reference)
9445 /* In C++0x, the type we are creating a reference to might be
9446 a typedef which is itself a reference type. In that case,
9447 we follow the reference collapsing rules in
9448 [7.1.3/8 dcl.typedef] to create the final reference type:
9450 "If a typedef TD names a type that is a reference to a type
9451 T, an attempt to create the type 'lvalue reference to cv TD'
9452 creates the type 'lvalue reference to T,' while an attempt
9453 to create the type "rvalue reference to cv TD' creates the
9456 if (VOID_TYPE_P (type))
9457 /* We already gave an error. */;
9458 else if (TREE_CODE (type) == REFERENCE_TYPE)
9460 if (declarator->u.reference.rvalue_ref)
9461 /* Leave type alone. */;
9463 type = cp_build_reference_type (TREE_TYPE (type), false);
9466 type = cp_build_reference_type
9467 (type, declarator->u.reference.rvalue_ref);
9469 /* In C++0x, we need this check for direct reference to
9470 reference declarations, which are forbidden by
9471 [8.3.2/5 dcl.ref]. Reference to reference declarations
9472 are only allowed indirectly through typedefs and template
9473 type arguments. Example:
9475 void foo(int & &); // invalid ref-to-ref decl
9477 typedef int & int_ref;
9478 void foo(int_ref &); // valid ref-to-ref decl
9480 if (inner_declarator && inner_declarator->kind == cdk_reference)
9481 error ("cannot declare reference to %q#T, which is not "
9482 "a typedef or a template type argument", type);
9484 else if (TREE_CODE (type) == METHOD_TYPE)
9485 type = build_ptrmemfunc_type (build_pointer_type (type));
9486 else if (declarator->kind == cdk_ptrmem)
9488 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9490 if (declarator->u.pointer.class_type == error_mark_node)
9491 /* We will already have complained. */
9492 type = error_mark_node;
9494 type = build_ptrmem_type (declarator->u.pointer.class_type,
9498 type = build_pointer_type (type);
9500 /* Process a list of type modifier keywords (such as
9501 const or volatile) that were given inside the `*' or `&'. */
9503 if (declarator->u.pointer.qualifiers)
9506 = cp_build_qualified_type (type,
9507 declarator->u.pointer.qualifiers);
9508 type_quals = cp_type_quals (type);
9521 /* We need to stabilize side-effects in VLA sizes for regular array
9522 declarations too, not just pointers to arrays. */
9523 if (type != error_mark_node && !TYPE_NAME (type)
9524 && (decl_context == NORMAL || decl_context == FIELD)
9525 && at_function_scope_p ()
9526 && variably_modified_type_p (type, NULL_TREE))
9527 stabilize_vla_size (TYPE_SIZE (type));
9529 /* A `constexpr' specifier used in an object declaration declares
9530 the object as `const'. */
9531 if (constexpr_p && innermost_code != cdk_function)
9533 if (type_quals & TYPE_QUAL_VOLATILE)
9534 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9535 if (TREE_CODE (type) != REFERENCE_TYPE)
9537 type_quals |= TYPE_QUAL_CONST;
9538 type = cp_build_qualified_type (type, type_quals);
9542 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9543 && TREE_CODE (type) != FUNCTION_TYPE
9544 && TREE_CODE (type) != METHOD_TYPE)
9546 error ("template-id %qD used as a declarator",
9548 unqualified_id = dname;
9551 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9552 qualified with a class-name, turn it into a METHOD_TYPE, unless
9553 we know that the function is static. We take advantage of this
9554 opportunity to do other processing that pertains to entities
9555 explicitly declared to be class members. Note that if DECLARATOR
9556 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9557 would not have exited the loop above. */
9559 && declarator->u.id.qualifying_scope
9560 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9562 ctype = declarator->u.id.qualifying_scope;
9563 ctype = TYPE_MAIN_VARIANT (ctype);
9564 template_count = num_template_headers_for_class (ctype);
9566 if (ctype == current_class_type)
9570 permerror (input_location, "member functions are implicitly friends of their class");
9574 permerror (declarator->id_loc,
9575 "extra qualification %<%T::%> on member %qs",
9578 else if (/* If the qualifying type is already complete, then we
9579 can skip the following checks. */
9580 !COMPLETE_TYPE_P (ctype)
9581 && (/* If the function is being defined, then
9582 qualifying type must certainly be complete. */
9584 /* A friend declaration of "T::f" is OK, even if
9585 "T" is a template parameter. But, if this
9586 function is not a friend, the qualifying type
9588 || (!friendp && !CLASS_TYPE_P (ctype))
9589 /* For a declaration, the type need not be
9590 complete, if either it is dependent (since there
9591 is no meaningful definition of complete in that
9592 case) or the qualifying class is currently being
9594 || !(dependent_type_p (ctype)
9595 || currently_open_class (ctype)))
9596 /* Check that the qualifying type is complete. */
9597 && !complete_type_or_else (ctype, NULL_TREE))
9598 return error_mark_node;
9599 else if (TREE_CODE (type) == FUNCTION_TYPE)
9601 if (current_class_type
9602 && (!friendp || funcdef_flag))
9605 ? G_("cannot define member function %<%T::%s%> "
9607 : G_("cannot declare member function %<%T::%s%> "
9609 ctype, name, current_class_type);
9610 return error_mark_node;
9613 else if (decl_spec_seq_has_spec_p (declspecs, ds_typedef)
9614 && current_class_type)
9616 error ("cannot declare member %<%T::%s%> within %qT",
9617 ctype, name, current_class_type);
9618 return error_mark_node;
9622 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9623 ctype = current_class_type;
9625 /* Now TYPE has the actual type. */
9630 *attrlist = chainon (returned_attrs, *attrlist);
9632 attrlist = &returned_attrs;
9635 /* Handle parameter packs. */
9636 if (parameter_pack_p)
9638 if (decl_context == PARM)
9639 /* Turn the type into a pack expansion.*/
9640 type = make_pack_expansion (type);
9642 error ("non-parameter %qs cannot be a parameter pack", name);
9645 /* Did array size calculations overflow or does the array cover more
9646 than half of the address-space? */
9647 if (TREE_CODE (type) == ARRAY_TYPE
9648 && COMPLETE_TYPE_P (type)
9649 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9650 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type)))
9652 error ("size of array %qs is too large", name);
9653 /* If we proceed with the array type as it is, we'll eventually
9654 crash in tree_low_cst(). */
9655 type = error_mark_node;
9658 if ((decl_context == FIELD || decl_context == PARM)
9659 && !processing_template_decl
9660 && variably_modified_type_p (type, NULL_TREE))
9662 if (decl_context == FIELD)
9663 error ("data member may not have variably modified type %qT", type);
9665 error ("parameter may not have variably modified type %qT", type);
9666 type = error_mark_node;
9669 if (explicitp == 1 || (explicitp && friendp))
9671 /* [dcl.fct.spec] The explicit specifier shall only be used in
9672 declarations of constructors within a class definition. */
9673 error ("only declarations of constructors can be %<explicit%>");
9677 if (storage_class == sc_mutable)
9679 if (decl_context != FIELD || friendp)
9681 error ("non-member %qs cannot be declared %<mutable%>", name);
9682 storage_class = sc_none;
9684 else if (decl_context == TYPENAME
9685 || decl_spec_seq_has_spec_p (declspecs, ds_typedef))
9687 error ("non-object member %qs cannot be declared %<mutable%>", name);
9688 storage_class = sc_none;
9690 else if (TREE_CODE (type) == FUNCTION_TYPE
9691 || TREE_CODE (type) == METHOD_TYPE)
9693 error ("function %qs cannot be declared %<mutable%>", name);
9694 storage_class = sc_none;
9698 error ("static %qs cannot be declared %<mutable%>", name);
9699 storage_class = sc_none;
9701 else if (type_quals & TYPE_QUAL_CONST)
9703 error ("const %qs cannot be declared %<mutable%>", name);
9704 storage_class = sc_none;
9706 else if (TREE_CODE (type) == REFERENCE_TYPE)
9708 permerror (input_location, "reference %qs cannot be declared "
9709 "%<mutable%>", name);
9710 storage_class = sc_none;
9714 /* If this is declaring a typedef name, return a TYPE_DECL. */
9715 if (decl_spec_seq_has_spec_p (declspecs, ds_typedef) && decl_context != TYPENAME)
9719 /* Note that the grammar rejects storage classes
9720 in typenames, fields or parameters. */
9721 if (current_lang_name == lang_name_java)
9722 TYPE_FOR_JAVA (type) = 1;
9724 /* This declaration:
9726 typedef void f(int) const;
9728 declares a function type which is not a member of any
9729 particular class, but which is cv-qualified; for
9730 example "f S::*" declares a pointer to a const-qualified
9731 member function of S. We record the cv-qualification in the
9733 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9735 type = apply_memfn_quals (type, memfn_quals);
9737 /* We have now dealt with these qualifiers. */
9738 memfn_quals = TYPE_UNQUALIFIED;
9741 if (type_uses_auto (type))
9743 error ("typedef declared %<auto%>");
9744 type = error_mark_node;
9747 if (decl_context == FIELD)
9748 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9750 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9751 if (id_declarator && declarator->u.id.qualifying_scope) {
9752 error_at (DECL_SOURCE_LOCATION (decl),
9753 "typedef name may not be a nested-name-specifier");
9754 TREE_TYPE (decl) = error_mark_node;
9757 if (decl_context != FIELD)
9759 if (!current_function_decl)
9760 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9761 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9762 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9763 (current_function_decl)))
9764 /* The TYPE_DECL is "abstract" because there will be
9765 clones of this constructor/destructor, and there will
9766 be copies of this TYPE_DECL generated in those
9768 DECL_ABSTRACT (decl) = 1;
9770 else if (current_class_type
9771 && constructor_name_p (unqualified_id, current_class_type))
9772 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9773 "as enclosing class",
9776 /* If the user declares "typedef struct {...} foo" then the
9777 struct will have an anonymous name. Fill that name in now.
9778 Nothing can refer to it, so nothing needs know about the name
9780 if (type != error_mark_node
9783 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9784 && TYPE_ANONYMOUS_P (type)
9785 && declspecs->type_definition_p
9786 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9790 /* Replace the anonymous name with the real name everywhere. */
9791 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9793 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9794 /* We do not rename the debug info representing the
9795 anonymous tagged type because the standard says in
9796 [dcl.typedef] that the naming applies only for
9797 linkage purposes. */
9798 /*debug_hooks->set_name (t, decl);*/
9799 TYPE_NAME (t) = decl;
9802 if (TYPE_LANG_SPECIFIC (type))
9803 TYPE_WAS_ANONYMOUS (type) = 1;
9805 /* If this is a typedef within a template class, the nested
9806 type is a (non-primary) template. The name for the
9807 template needs updating as well. */
9808 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9809 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9810 = TYPE_IDENTIFIER (type);
9812 /* Adjust linkage now that we aren't anonymous anymore. */
9813 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9814 determine_visibility (TYPE_MAIN_DECL (type));
9816 /* FIXME remangle member functions; member functions of a
9817 type with external linkage have external linkage. */
9821 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9822 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9824 bad_specifiers (decl, BSP_TYPE, virtualp,
9825 memfn_quals != TYPE_UNQUALIFIED,
9826 inlinep, friendp, raises != NULL_TREE);
9828 if (decl_spec_seq_has_spec_p (declspecs, ds_alias))
9829 /* Acknowledge that this was written:
9830 `using analias = atype;'. */
9831 TYPE_DECL_ALIAS_P (decl) = 1;
9836 /* Detect the case of an array type of unspecified size
9837 which came, as such, direct from a typedef name.
9838 We must copy the type, so that the array's domain can be
9839 individually set by the object's initializer. */
9841 if (type && typedef_type
9842 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9843 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9844 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9846 /* Detect where we're using a typedef of function type to declare a
9847 function. PARMS will not be set, so we must create it now. */
9849 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9851 tree decls = NULL_TREE;
9854 for (args = TYPE_ARG_TYPES (type);
9855 args && args != void_list_node;
9856 args = TREE_CHAIN (args))
9858 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9860 DECL_CHAIN (decl) = decls;
9864 parms = nreverse (decls);
9866 if (decl_context != TYPENAME)
9868 /* A cv-qualifier-seq shall only be part of the function type
9869 for a non-static member function. [8.3.5/4 dcl.fct] */
9870 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9871 && (current_class_type == NULL_TREE || staticp) )
9874 ? G_("qualified function types cannot be used to "
9875 "declare static member functions")
9876 : G_("qualified function types cannot be used to "
9877 "declare free functions"));
9878 type = TYPE_MAIN_VARIANT (type);
9881 /* The qualifiers on the function type become the qualifiers on
9882 the non-static member function. */
9883 memfn_quals |= type_memfn_quals (type);
9884 type_quals = TYPE_UNQUALIFIED;
9888 /* If this is a type name (such as, in a cast or sizeof),
9889 compute the type and return it now. */
9891 if (decl_context == TYPENAME)
9893 /* Note that the grammar rejects storage classes
9894 in typenames, fields or parameters. */
9895 if (type_quals != TYPE_UNQUALIFIED)
9896 type_quals = TYPE_UNQUALIFIED;
9898 /* Special case: "friend class foo" looks like a TYPENAME context. */
9901 if (type_quals != TYPE_UNQUALIFIED)
9903 error ("type qualifiers specified for friend class declaration");
9904 type_quals = TYPE_UNQUALIFIED;
9908 error ("%<inline%> specified for friend class declaration");
9914 /* Don't allow friend declaration without a class-key. */
9915 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9916 permerror (input_location, "template parameters cannot be friends");
9917 else if (TREE_CODE (type) == TYPENAME_TYPE)
9918 permerror (input_location, "friend declaration requires class-key, "
9919 "i.e. %<friend class %T::%D%>",
9920 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9922 permerror (input_location, "friend declaration requires class-key, "
9923 "i.e. %<friend %#T%>",
9927 /* Only try to do this stuff if we didn't already give up. */
9928 if (type != integer_type_node)
9930 /* A friendly class? */
9931 if (current_class_type)
9932 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9935 error ("trying to make class %qT a friend of global scope",
9938 type = void_type_node;
9941 else if (memfn_quals)
9943 if (ctype == NULL_TREE
9944 && TREE_CODE (type) == METHOD_TYPE)
9945 ctype = TYPE_METHOD_BASETYPE (type);
9948 type = build_memfn_type (type, ctype, memfn_quals);
9949 /* Core issue #547: need to allow this in template type args. */
9950 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9951 type = apply_memfn_quals (type, memfn_quals);
9953 error ("invalid qualifiers on non-member function type");
9958 else if (unqualified_id == NULL_TREE && decl_context != PARM
9959 && decl_context != CATCHPARM
9960 && TREE_CODE (type) != UNION_TYPE
9963 error ("abstract declarator %qT used as declaration", type);
9964 return error_mark_node;
9967 /* Only functions may be declared using an operator-function-id. */
9969 && IDENTIFIER_OPNAME_P (unqualified_id)
9970 && TREE_CODE (type) != FUNCTION_TYPE
9971 && TREE_CODE (type) != METHOD_TYPE)
9973 error ("declaration of %qD as non-function", unqualified_id);
9974 return error_mark_node;
9977 /* We don't check parameter types here because we can emit a better
9978 error message later. */
9979 if (decl_context != PARM)
9981 type = check_var_type (unqualified_id, type);
9982 if (type == error_mark_node)
9983 return error_mark_node;
9986 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9987 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9989 if (decl_context == PARM || decl_context == CATCHPARM)
9991 if (ctype || in_namespace)
9992 error ("cannot use %<::%> in parameter declaration");
9994 if (type_uses_auto (type))
9996 error ("parameter declared %<auto%>");
9997 type = error_mark_node;
10000 /* A parameter declared as an array of T is really a pointer to T.
10001 One declared as a function is really a pointer to a function.
10002 One declared as a member is really a pointer to member. */
10004 if (TREE_CODE (type) == ARRAY_TYPE)
10006 /* Transfer const-ness of array into that of type pointed to. */
10007 type = build_pointer_type (TREE_TYPE (type));
10008 type_quals = TYPE_UNQUALIFIED;
10010 else if (TREE_CODE (type) == FUNCTION_TYPE)
10011 type = build_pointer_type (type);
10014 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10015 && !NEW_DELETE_OPNAME_P (unqualified_id))
10017 cp_cv_quals real_quals = memfn_quals;
10018 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
10019 real_quals |= TYPE_QUAL_CONST;
10020 type = build_memfn_type (type, ctype, real_quals);
10026 if (decl_context == PARM)
10028 decl = cp_build_parm_decl (unqualified_id, type);
10030 bad_specifiers (decl, BSP_PARM, virtualp,
10031 memfn_quals != TYPE_UNQUALIFIED,
10032 inlinep, friendp, raises != NULL_TREE);
10034 else if (decl_context == FIELD)
10036 if (!staticp && TREE_CODE (type) != METHOD_TYPE
10037 && type_uses_auto (type))
10039 error ("non-static data member declared %<auto%>");
10040 type = error_mark_node;
10043 /* The C99 flexible array extension. */
10044 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10045 && TYPE_DOMAIN (type) == NULL_TREE)
10047 tree itype = compute_array_index_type (dname, integer_zero_node,
10048 tf_warning_or_error);
10049 type = build_cplus_array_type (TREE_TYPE (type), itype);
10052 if (type == error_mark_node)
10054 /* Happens when declaring arrays of sizes which
10055 are error_mark_node, for example. */
10058 else if (in_namespace && !friendp)
10060 /* Something like struct S { int N::j; }; */
10061 error ("invalid use of %<::%>");
10062 return error_mark_node;
10064 else if (TREE_CODE (type) == FUNCTION_TYPE
10065 || TREE_CODE (type) == METHOD_TYPE)
10068 tree function_context;
10072 /* This should never happen in pure C++ (the check
10073 could be an assert). It could happen in
10074 Objective-C++ if someone writes invalid code that
10075 uses a function declaration for an instance
10076 variable or property (instance variables and
10077 properties are parsed as FIELD_DECLs, but they are
10078 part of an Objective-C class, not a C++ class).
10079 That code is invalid and is caught by this
10083 error ("declaration of function %qD in invalid context",
10085 return error_mark_node;
10088 /* ``A union may [ ... ] not [ have ] virtual functions.''
10090 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10092 error ("function %qD declared virtual inside a union",
10094 return error_mark_node;
10097 if (NEW_DELETE_OPNAME_P (unqualified_id))
10101 error ("%qD cannot be declared virtual, since it "
10102 "is always static",
10109 /* Check that the name used for a destructor makes sense. */
10110 if (sfk == sfk_destructor)
10112 tree uqname = id_declarator->u.id.unqualified_name;
10116 gcc_assert (friendp);
10117 error ("expected qualified name in friend declaration "
10118 "for destructor %qD", uqname);
10119 return error_mark_node;
10122 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10124 error ("declaration of %qD as member of %qT",
10126 return error_mark_node;
10130 error ("a destructor cannot be %<constexpr%>");
10131 return error_mark_node;
10134 else if (sfk == sfk_constructor && friendp && !ctype)
10136 error ("expected qualified name in friend declaration "
10137 "for constructor %qD",
10138 id_declarator->u.id.unqualified_name);
10139 return error_mark_node;
10142 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10143 function_context = (ctype != NULL_TREE) ?
10144 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10145 publicp = (! friendp || ! staticp)
10146 && function_context == NULL_TREE;
10147 decl = grokfndecl (ctype, type,
10148 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10149 ? unqualified_id : dname,
10152 virtualp, flags, memfn_quals, raises,
10153 friendp ? -1 : 0, friendp, publicp,
10154 inlinep | (2 * constexpr_p),
10156 funcdef_flag, template_count, in_namespace,
10157 attrlist, declarator->id_loc);
10158 decl = set_virt_specifiers (decl, virt_specifiers);
10159 if (decl == NULL_TREE)
10160 return error_mark_node;
10162 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10163 /* The decl and setting of decl_attr is also turned off. */
10164 decl = build_decl_attribute_variant (decl, decl_attr);
10167 /* [class.conv.ctor]
10169 A constructor declared without the function-specifier
10170 explicit that can be called with a single parameter
10171 specifies a conversion from the type of its first
10172 parameter to the type of its class. Such a constructor
10173 is called a converting constructor. */
10174 if (explicitp == 2)
10175 DECL_NONCONVERTING_P (decl) = 1;
10177 else if (!staticp && !dependent_type_p (type)
10178 && !COMPLETE_TYPE_P (complete_type (type))
10179 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10181 if (unqualified_id)
10182 error ("field %qD has incomplete type", unqualified_id);
10184 error ("name %qT has incomplete type", type);
10186 /* If we're instantiating a template, tell them which
10187 instantiation made the field's type be incomplete. */
10188 if (current_class_type
10189 && TYPE_NAME (current_class_type)
10190 && IDENTIFIER_TEMPLATE (current_class_name)
10192 && declspecs->type == type)
10193 error (" in instantiation of template %qT",
10194 current_class_type);
10196 return error_mark_node;
10202 error ("%qE is neither function nor member function; "
10203 "cannot be declared friend", unqualified_id);
10211 /* Friends are treated specially. */
10212 if (ctype == current_class_type)
10213 ; /* We already issued a permerror. */
10214 else if (decl && DECL_NAME (decl))
10216 if (template_class_depth (current_class_type) == 0)
10218 decl = check_explicit_specialization
10219 (unqualified_id, decl, template_count,
10220 2 * funcdef_flag + 4);
10221 if (decl == error_mark_node)
10222 return error_mark_node;
10225 decl = do_friend (ctype, unqualified_id, decl,
10231 return error_mark_node;
10234 /* Structure field. It may not be a function, except for C++. */
10236 if (decl == NULL_TREE)
10240 /* C++ allows static class members. All other work
10241 for this is done by grokfield. */
10242 decl = build_lang_decl_loc (declarator->id_loc,
10243 VAR_DECL, unqualified_id, type);
10244 set_linkage_for_static_data_member (decl);
10245 /* Even if there is an in-class initialization, DECL
10246 is considered undefined until an out-of-class
10247 definition is provided. */
10248 DECL_EXTERNAL (decl) = 1;
10251 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10253 if (constexpr_p && !initialized)
10255 error ("constexpr static data member %qD must have an "
10256 "initializer", decl);
10257 constexpr_p = false;
10264 error ("non-static data member %qE declared %<constexpr%>",
10266 constexpr_p = false;
10268 decl = build_decl (input_location,
10269 FIELD_DECL, unqualified_id, type);
10270 DECL_NONADDRESSABLE_P (decl) = bitfield;
10271 if (bitfield && !unqualified_id)
10272 TREE_NO_WARNING (decl) = 1;
10274 if (storage_class == sc_mutable)
10276 DECL_MUTABLE_P (decl) = 1;
10277 storage_class = sc_none;
10282 /* An attempt is being made to initialize a non-static
10283 member. This is new in C++11. */
10284 maybe_warn_cpp0x (CPP0X_NSDMI);
10286 /* If this has been parsed with static storage class, but
10287 errors forced staticp to be cleared, ensure NSDMI is
10289 if (declspecs->storage_class == sc_static)
10290 DECL_INITIAL (decl) = error_mark_node;
10294 bad_specifiers (decl, BSP_FIELD, virtualp,
10295 memfn_quals != TYPE_UNQUALIFIED,
10296 inlinep, friendp, raises != NULL_TREE);
10299 else if (TREE_CODE (type) == FUNCTION_TYPE
10300 || TREE_CODE (type) == METHOD_TYPE)
10302 tree original_name;
10305 if (!unqualified_id)
10306 return error_mark_node;
10308 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10309 original_name = dname;
10311 original_name = unqualified_id;
10313 if (storage_class == sc_auto)
10314 error ("storage class %<auto%> invalid for function %qs", name);
10315 else if (storage_class == sc_register)
10316 error ("storage class %<register%> invalid for function %qs", name);
10318 error ("storage class %<__thread%> invalid for function %qs", name);
10320 if (virt_specifiers)
10321 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10322 /* Function declaration not at top level.
10323 Storage classes other than `extern' are not allowed
10324 and `extern' makes no difference. */
10325 if (! toplevel_bindings_p ()
10326 && (storage_class == sc_static
10327 || decl_spec_seq_has_spec_p (declspecs, ds_inline))
10330 if (storage_class == sc_static)
10331 pedwarn (input_location, OPT_Wpedantic,
10332 "%<static%> specified invalid for function %qs "
10333 "declared out of global scope", name);
10335 pedwarn (input_location, OPT_Wpedantic,
10336 "%<inline%> specifier invalid for function %qs "
10337 "declared out of global scope", name);
10340 if (ctype == NULL_TREE)
10344 error ("virtual non-class function %qs", name);
10347 else if (sfk == sfk_constructor
10348 || sfk == sfk_destructor)
10350 error (funcdef_flag
10351 ? G_("%qs defined in a non-class scope")
10352 : G_("%qs declared in a non-class scope"), name);
10357 /* Record presence of `static'. */
10358 publicp = (ctype != NULL_TREE
10359 || storage_class == sc_extern
10360 || storage_class != sc_static);
10362 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10363 virtualp, flags, memfn_quals, raises,
10365 publicp, inlinep | (2 * constexpr_p), sfk,
10367 template_count, in_namespace, attrlist,
10368 declarator->id_loc);
10369 if (decl == NULL_TREE)
10370 return error_mark_node;
10374 int invalid_static = 0;
10376 /* Don't allow a static member function in a class, and forbid
10377 declaring main to be static. */
10378 if (TREE_CODE (type) == METHOD_TYPE)
10380 permerror (input_location, "cannot declare member function %qD to have "
10381 "static linkage", decl);
10382 invalid_static = 1;
10384 else if (current_function_decl)
10386 /* FIXME need arm citation */
10387 error ("cannot declare static function inside another function");
10388 invalid_static = 1;
10391 if (invalid_static)
10394 storage_class = sc_none;
10400 /* It's a variable. */
10402 /* An uninitialized decl with `extern' is a reference. */
10403 decl = grokvardecl (type, unqualified_id,
10406 (type_quals & TYPE_QUAL_CONST) != 0,
10407 ctype ? ctype : in_namespace);
10408 bad_specifiers (decl, BSP_VAR, virtualp,
10409 memfn_quals != TYPE_UNQUALIFIED,
10410 inlinep, friendp, raises != NULL_TREE);
10414 DECL_CONTEXT (decl) = ctype;
10417 permerror (input_location, "%<static%> may not be used when defining "
10418 "(as opposed to declaring) a static data member");
10420 storage_class = sc_none;
10422 if (storage_class == sc_register && TREE_STATIC (decl))
10424 error ("static member %qD declared %<register%>", decl);
10425 storage_class = sc_none;
10427 if (storage_class == sc_extern && pedantic)
10429 pedwarn (input_location, OPT_Wpedantic,
10430 "cannot explicitly declare member %q#D to have "
10431 "extern linkage", decl);
10432 storage_class = sc_none;
10435 else if (constexpr_p && DECL_EXTERNAL (decl))
10437 error ("declaration of constexpr variable %qD is not a definition",
10439 constexpr_p = false;
10443 if (storage_class == sc_extern && initialized && !funcdef_flag)
10445 if (toplevel_bindings_p ())
10447 /* It's common practice (and completely valid) to have a const
10448 be initialized and declared extern. */
10449 if (!(type_quals & TYPE_QUAL_CONST))
10450 warning (0, "%qs initialized and declared %<extern%>", name);
10454 error ("%qs has both %<extern%> and initializer", name);
10455 return error_mark_node;
10459 /* Record `register' declaration for warnings on &
10460 and in case doing stupid register allocation. */
10462 if (storage_class == sc_register)
10463 DECL_REGISTER (decl) = 1;
10464 else if (storage_class == sc_extern)
10465 DECL_THIS_EXTERN (decl) = 1;
10466 else if (storage_class == sc_static)
10467 DECL_THIS_STATIC (decl) = 1;
10469 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10470 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10471 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10473 /* Record constancy and volatility on the DECL itself . There's
10474 no need to do this when processing a template; we'll do this
10475 for the instantiated declaration based on the type of DECL. */
10476 if (!processing_template_decl)
10477 cp_apply_type_quals_to_decl (type_quals, decl);
10483 /* Subroutine of start_function. Ensure that each of the parameter
10484 types (as listed in PARMS) is complete, as is required for a
10485 function definition. */
10488 require_complete_types_for_parms (tree parms)
10490 for (; parms; parms = DECL_CHAIN (parms))
10492 if (dependent_type_p (TREE_TYPE (parms)))
10494 if (!VOID_TYPE_P (TREE_TYPE (parms))
10495 && complete_type_or_else (TREE_TYPE (parms), parms))
10497 relayout_decl (parms);
10498 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10501 /* grokparms or complete_type_or_else will have already issued
10503 TREE_TYPE (parms) = error_mark_node;
10507 /* Returns nonzero if T is a local variable. */
10510 local_variable_p (const_tree t)
10512 if ((TREE_CODE (t) == VAR_DECL
10513 /* A VAR_DECL with a context that is a _TYPE is a static data
10515 && !TYPE_P (CP_DECL_CONTEXT (t))
10516 /* Any other non-local variable must be at namespace scope. */
10517 && !DECL_NAMESPACE_SCOPE_P (t))
10518 || (TREE_CODE (t) == PARM_DECL))
10524 /* Like local_variable_p, but suitable for use as a tree-walking
10528 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10529 void *data ATTRIBUTE_UNUSED)
10531 /* Check DECL_NAME to avoid including temporaries. We don't check
10532 DECL_ARTIFICIAL because we do want to complain about 'this'. */
10533 if (local_variable_p (*tp) && DECL_NAME (*tp))
10535 else if (TYPE_P (*tp))
10536 *walk_subtrees = 0;
10541 /* Check that ARG, which is a default-argument expression for a
10542 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10543 something goes wrong. DECL may also be a _TYPE node, rather than a
10544 DECL, if there is no DECL available. */
10547 check_default_argument (tree decl, tree arg)
10552 if (TREE_CODE (arg) == DEFAULT_ARG)
10553 /* We get a DEFAULT_ARG when looking at an in-class declaration
10554 with a default argument. Ignore the argument for now; we'll
10555 deal with it after the class is complete. */
10564 decl_type = TREE_TYPE (decl);
10566 if (arg == error_mark_node
10567 || decl == error_mark_node
10568 || TREE_TYPE (arg) == error_mark_node
10569 || decl_type == error_mark_node)
10570 /* Something already went wrong. There's no need to check
10572 return error_mark_node;
10574 /* [dcl.fct.default]
10576 A default argument expression is implicitly converted to the
10578 ++cp_unevaluated_operand;
10579 perform_implicit_conversion_flags (decl_type, arg, tf_warning_or_error,
10581 --cp_unevaluated_operand;
10583 if (warn_zero_as_null_pointer_constant
10584 && c_inhibit_evaluation_warnings == 0
10585 && TYPE_PTR_OR_PTRMEM_P (decl_type)
10586 && null_ptr_cst_p (arg)
10587 && !NULLPTR_TYPE_P (TREE_TYPE (arg)))
10589 warning (OPT_Wzero_as_null_pointer_constant,
10590 "zero as null pointer constant");
10591 return nullptr_node;
10594 /* [dcl.fct.default]
10596 Local variables shall not be used in default argument
10599 The keyword `this' shall not be used in a default argument of a
10600 member function. */
10601 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10604 if (DECL_NAME (var) == this_identifier)
10605 permerror (input_location, "default argument %qE uses %qD", arg, var);
10607 error ("default argument %qE uses local variable %qD", arg, var);
10608 return error_mark_node;
10615 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10618 type_is_deprecated (tree type)
10620 enum tree_code code;
10621 if (TREE_DEPRECATED (type))
10623 if (TYPE_NAME (type)
10624 && TREE_DEPRECATED (TYPE_NAME (type)))
10627 /* Do warn about using typedefs to a deprecated class. */
10628 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10629 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10631 code = TREE_CODE (type);
10633 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10634 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10635 || code == METHOD_TYPE || code == ARRAY_TYPE)
10636 return type_is_deprecated (TREE_TYPE (type));
10638 if (TYPE_PTRMEMFUNC_P (type))
10639 return type_is_deprecated
10640 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10645 /* Decode the list of parameter types for a function type.
10646 Given the list of things declared inside the parens,
10647 return a list of types.
10649 If this parameter does not end with an ellipsis, we append
10652 *PARMS is set to the chain of PARM_DECLs created. */
10655 grokparms (tree parmlist, tree *parms)
10657 tree result = NULL_TREE;
10658 tree decls = NULL_TREE;
10662 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10664 tree type = NULL_TREE;
10665 tree init = TREE_PURPOSE (parm);
10666 tree decl = TREE_VALUE (parm);
10667 const char *errmsg;
10669 if (parm == void_list_node)
10672 if (! decl || TREE_TYPE (decl) == error_mark_node)
10675 type = TREE_TYPE (decl);
10676 if (VOID_TYPE_P (type))
10678 if (same_type_p (type, void_type_node)
10679 && DECL_SELF_REFERENCE_P (type)
10680 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10681 /* this is a parmlist of `(void)', which is ok. */
10683 cxx_incomplete_type_error (decl, type);
10684 /* It's not a good idea to actually create parameters of
10685 type `void'; other parts of the compiler assume that a
10686 void type terminates the parameter list. */
10687 type = error_mark_node;
10688 TREE_TYPE (decl) = error_mark_node;
10691 if (type != error_mark_node
10692 && TYPE_FOR_JAVA (type)
10693 && MAYBE_CLASS_TYPE_P (type))
10695 error ("parameter %qD has Java class type", decl);
10696 type = error_mark_node;
10697 TREE_TYPE (decl) = error_mark_node;
10701 if (type != error_mark_node
10702 && (errmsg = targetm.invalid_parameter_type (type)))
10705 type = error_mark_node;
10706 TREE_TYPE (decl) = error_mark_node;
10709 if (type != error_mark_node)
10711 if (deprecated_state != DEPRECATED_SUPPRESS)
10713 tree deptype = type_is_deprecated (type);
10715 warn_deprecated_use (deptype, NULL_TREE);
10718 /* Top-level qualifiers on the parameters are
10719 ignored for function types. */
10720 type = cp_build_qualified_type (type, 0);
10721 if (TREE_CODE (type) == METHOD_TYPE)
10723 error ("parameter %qD invalidly declared method type", decl);
10724 type = build_pointer_type (type);
10725 TREE_TYPE (decl) = type;
10727 else if (abstract_virtuals_error (decl, type))
10728 any_error = 1; /* Seems like a good idea. */
10729 else if (POINTER_TYPE_P (type))
10731 /* [dcl.fct]/6, parameter types cannot contain pointers
10732 (references) to arrays of unknown bound. */
10733 tree t = TREE_TYPE (type);
10734 int ptr = TYPE_PTR_P (type);
10738 if (TYPE_PTR_P (t))
10740 else if (TREE_CODE (t) != ARRAY_TYPE)
10742 else if (!TYPE_DOMAIN (t))
10746 if (TREE_CODE (t) == ARRAY_TYPE)
10748 ? G_("parameter %qD includes pointer to array of "
10749 "unknown bound %qT")
10750 : G_("parameter %qD includes reference to array of "
10751 "unknown bound %qT"),
10757 else if (init && !processing_template_decl)
10758 init = check_default_argument (decl, init);
10761 DECL_CHAIN (decl) = decls;
10763 result = tree_cons (init, type, result);
10765 decls = nreverse (decls);
10766 result = nreverse (result);
10768 result = chainon (result, void_list_node);
10775 /* D is a constructor or overloaded `operator='.
10777 Let T be the class in which D is declared. Then, this function
10780 -1 if D's is an ill-formed constructor or copy assignment operator
10781 whose first parameter is of type `T'.
10782 0 if D is not a copy constructor or copy assignment
10784 1 if D is a copy constructor or copy assignment operator whose
10785 first parameter is a reference to non-const qualified T.
10786 2 if D is a copy constructor or copy assignment operator whose
10787 first parameter is a reference to const qualified T.
10789 This function can be used as a predicate. Positive values indicate
10790 a copy constructor and nonzero values indicate a copy assignment
10794 copy_fn_p (const_tree d)
10800 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10802 if (TREE_CODE (d) == TEMPLATE_DECL
10803 || (DECL_TEMPLATE_INFO (d)
10804 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10805 /* Instantiations of template member functions are never copy
10806 functions. Note that member functions of templated classes are
10807 represented as template functions internally, and we must
10808 accept those as copy functions. */
10811 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10815 arg_type = TREE_VALUE (args);
10816 if (arg_type == error_mark_node)
10819 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10821 /* Pass by value copy assignment operator. */
10824 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10825 && !TYPE_REF_IS_RVALUE (arg_type)
10826 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10828 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10834 args = TREE_CHAIN (args);
10836 if (args && args != void_list_node && !TREE_PURPOSE (args))
10837 /* There are more non-optional args. */
10843 /* D is a constructor or overloaded `operator='.
10845 Let T be the class in which D is declared. Then, this function
10846 returns true when D is a move constructor or move assignment
10847 operator, false otherwise. */
10850 move_fn_p (const_tree d)
10854 bool result = false;
10856 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10858 if (cxx_dialect == cxx98)
10859 /* There are no move constructors if we are in C++98 mode. */
10862 if (TREE_CODE (d) == TEMPLATE_DECL
10863 || (DECL_TEMPLATE_INFO (d)
10864 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10865 /* Instantiations of template member functions are never copy
10866 functions. Note that member functions of templated classes are
10867 represented as template functions internally, and we must
10868 accept those as copy functions. */
10871 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10875 arg_type = TREE_VALUE (args);
10876 if (arg_type == error_mark_node)
10879 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10880 && TYPE_REF_IS_RVALUE (arg_type)
10881 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10885 args = TREE_CHAIN (args);
10887 if (args && args != void_list_node && !TREE_PURPOSE (args))
10888 /* There are more non-optional args. */
10894 /* Remember any special properties of member function DECL. */
10897 grok_special_member_properties (tree decl)
10901 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10904 class_type = DECL_CONTEXT (decl);
10905 if (DECL_CONSTRUCTOR_P (decl))
10907 int ctor = copy_fn_p (decl);
10909 if (!DECL_ARTIFICIAL (decl))
10910 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10916 A non-template constructor for class X is a copy
10917 constructor if its first parameter is of type X&, const
10918 X&, volatile X& or const volatile X&, and either there
10919 are no other parameters or else all other parameters have
10920 default arguments. */
10921 TYPE_HAS_COPY_CTOR (class_type) = 1;
10922 if (user_provided_p (decl))
10923 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10925 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10927 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10929 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10930 if (user_provided_p (decl))
10931 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10933 else if (move_fn_p (decl) && user_provided_p (decl))
10934 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10935 else if (is_list_ctor (decl))
10936 TYPE_HAS_LIST_CTOR (class_type) = 1;
10938 if (DECL_DECLARED_CONSTEXPR_P (decl)
10939 && !copy_fn_p (decl) && !move_fn_p (decl))
10940 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10942 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10946 A non-template assignment operator for class X is a copy
10947 assignment operator if its parameter is of type X, X&, const
10948 X&, volatile X& or const volatile X&. */
10950 int assop = copy_fn_p (decl);
10954 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10955 if (user_provided_p (decl))
10956 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10958 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10960 else if (move_fn_p (decl) && user_provided_p (decl))
10961 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10963 /* Destructors are handled in check_methods. */
10966 /* Check a constructor DECL has the correct form. Complains
10967 if the class has a constructor of the form X(X). */
10970 grok_ctor_properties (const_tree ctype, const_tree decl)
10972 int ctor_parm = copy_fn_p (decl);
10978 A declaration of a constructor for a class X is ill-formed if
10979 its first parameter is of type (optionally cv-qualified) X
10980 and either there are no other parameters or else all other
10981 parameters have default arguments.
10983 We *don't* complain about member template instantiations that
10984 have this form, though; they can occur as we try to decide
10985 what constructor to use during overload resolution. Since
10986 overload resolution will never prefer such a constructor to
10987 the non-template copy constructor (which is either explicitly
10988 or implicitly defined), there's no need to worry about their
10989 existence. Theoretically, they should never even be
10990 instantiated, but that's hard to forestall. */
10991 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10999 /* An operator with this code is unary, but can also be binary. */
11002 ambi_op_p (enum tree_code code)
11004 return (code == INDIRECT_REF
11005 || code == ADDR_EXPR
11006 || code == UNARY_PLUS_EXPR
11007 || code == NEGATE_EXPR
11008 || code == PREINCREMENT_EXPR
11009 || code == PREDECREMENT_EXPR);
11012 /* An operator with this name can only be unary. */
11015 unary_op_p (enum tree_code code)
11017 return (code == TRUTH_NOT_EXPR
11018 || code == BIT_NOT_EXPR
11019 || code == COMPONENT_REF
11020 || code == TYPE_EXPR);
11023 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11024 errors are issued for invalid declarations. */
11027 grok_op_properties (tree decl, bool complain)
11029 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11031 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11032 tree name = DECL_NAME (decl);
11033 enum tree_code operator_code;
11038 /* Count the number of arguments and check for ellipsis. */
11039 for (argtype = argtypes, arity = 0;
11040 argtype && argtype != void_list_node;
11041 argtype = TREE_CHAIN (argtype))
11043 ellipsis_p = !argtype;
11045 class_type = DECL_CONTEXT (decl);
11046 if (class_type && !CLASS_TYPE_P (class_type))
11047 class_type = NULL_TREE;
11049 if (DECL_CONV_FN_P (decl))
11050 operator_code = TYPE_EXPR;
11054 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11055 if (ansi_opname (CODE) == name) \
11057 operator_code = (CODE); \
11060 else if (ansi_assopname (CODE) == name) \
11062 operator_code = (CODE); \
11063 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11067 #include "operators.def"
11068 #undef DEF_OPERATOR
11070 gcc_unreachable ();
11073 gcc_assert (operator_code != MAX_TREE_CODES);
11074 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11077 switch (operator_code)
11080 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11084 TYPE_GETS_DELETE (class_type) |= 1;
11088 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11091 case VEC_DELETE_EXPR:
11092 TYPE_GETS_DELETE (class_type) |= 2;
11099 /* [basic.std.dynamic.allocation]/1:
11101 A program is ill-formed if an allocation function is declared
11102 in a namespace scope other than global scope or declared static
11105 The same also holds true for deallocation functions. */
11106 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11107 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11109 if (DECL_NAMESPACE_SCOPE_P (decl))
11111 if (CP_DECL_CONTEXT (decl) != global_namespace)
11113 error ("%qD may not be declared within a namespace", decl);
11116 else if (!TREE_PUBLIC (decl))
11118 error ("%qD may not be declared as static", decl);
11124 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11126 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11127 DECL_IS_OPERATOR_NEW (decl) = 1;
11129 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11130 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11133 /* An operator function must either be a non-static member function
11134 or have at least one parameter of a class, a reference to a class,
11135 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11136 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11138 if (operator_code == TYPE_EXPR
11139 || operator_code == CALL_EXPR
11140 || operator_code == COMPONENT_REF
11141 || operator_code == ARRAY_REF
11142 || operator_code == NOP_EXPR)
11144 error ("%qD must be a nonstatic member function", decl);
11151 if (DECL_STATIC_FUNCTION_P (decl))
11153 error ("%qD must be either a non-static member "
11154 "function or a non-member function", decl);
11158 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11160 tree arg = non_reference (TREE_VALUE (p));
11161 if (arg == error_mark_node)
11164 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11165 because these checks are performed even on
11166 template functions. */
11167 if (MAYBE_CLASS_TYPE_P (arg)
11168 || TREE_CODE (arg) == ENUMERAL_TYPE)
11172 if (!p || p == void_list_node)
11175 error ("%qD must have an argument of class or "
11176 "enumerated type", decl);
11182 /* There are no restrictions on the arguments to an overloaded
11184 if (operator_code == CALL_EXPR)
11187 /* Warn about conversion operators that will never be used. */
11188 if (IDENTIFIER_TYPENAME_P (name)
11189 && ! DECL_TEMPLATE_INFO (decl)
11191 /* Warn only declaring the function; there is no need to
11192 warn again about out-of-class definitions. */
11193 && class_type == current_class_type)
11195 tree t = TREE_TYPE (name);
11196 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11199 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11201 if (TREE_CODE (t) == VOID_TYPE)
11202 warning (OPT_Wconversion,
11204 ? G_("conversion to a reference to void "
11205 "will never use a type conversion operator")
11206 : G_("conversion to void "
11207 "will never use a type conversion operator"));
11208 else if (class_type)
11210 if (t == class_type)
11211 warning (OPT_Wconversion,
11213 ? G_("conversion to a reference to the same type "
11214 "will never use a type conversion operator")
11215 : G_("conversion to the same type "
11216 "will never use a type conversion operator"));
11217 /* Don't force t to be complete here. */
11218 else if (MAYBE_CLASS_TYPE_P (t)
11219 && COMPLETE_TYPE_P (t)
11220 && DERIVED_FROM_P (t, class_type))
11221 warning (OPT_Wconversion,
11223 ? G_("conversion to a reference to a base class "
11224 "will never use a type conversion operator")
11225 : G_("conversion to a base class "
11226 "will never use a type conversion operator"));
11231 if (operator_code == COND_EXPR)
11234 error ("ISO C++ prohibits overloading operator ?:");
11237 else if (ellipsis_p)
11239 error ("%qD must not have variable number of arguments", decl);
11242 else if (ambi_op_p (operator_code))
11245 /* We pick the one-argument operator codes by default, so
11246 we don't have to change anything. */
11248 else if (arity == 2)
11250 /* If we thought this was a unary operator, we now know
11251 it to be a binary operator. */
11252 switch (operator_code)
11255 operator_code = MULT_EXPR;
11259 operator_code = BIT_AND_EXPR;
11262 case UNARY_PLUS_EXPR:
11263 operator_code = PLUS_EXPR;
11267 operator_code = MINUS_EXPR;
11270 case PREINCREMENT_EXPR:
11271 operator_code = POSTINCREMENT_EXPR;
11274 case PREDECREMENT_EXPR:
11275 operator_code = POSTDECREMENT_EXPR;
11279 gcc_unreachable ();
11282 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11284 if ((operator_code == POSTINCREMENT_EXPR
11285 || operator_code == POSTDECREMENT_EXPR)
11286 && ! processing_template_decl
11287 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11290 error ("postfix %qD must take %<int%> as its argument",
11293 error ("postfix %qD must take %<int%> as its second "
11301 error ("%qD must take either zero or one argument", decl);
11303 error ("%qD must take either one or two arguments", decl);
11307 /* More Effective C++ rule 6. */
11309 && (operator_code == POSTINCREMENT_EXPR
11310 || operator_code == POSTDECREMENT_EXPR
11311 || operator_code == PREINCREMENT_EXPR
11312 || operator_code == PREDECREMENT_EXPR))
11314 tree arg = TREE_VALUE (argtypes);
11315 tree ret = TREE_TYPE (TREE_TYPE (decl));
11316 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11317 arg = TREE_TYPE (arg);
11318 arg = TYPE_MAIN_VARIANT (arg);
11319 if (operator_code == PREINCREMENT_EXPR
11320 || operator_code == PREDECREMENT_EXPR)
11322 if (TREE_CODE (ret) != REFERENCE_TYPE
11323 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11325 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11326 build_reference_type (arg));
11330 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11331 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11335 else if (unary_op_p (operator_code))
11340 error ("%qD must take %<void%>", decl);
11342 error ("%qD must take exactly one argument", decl);
11346 else /* if (binary_op_p (operator_code)) */
11351 error ("%qD must take exactly one argument", decl);
11353 error ("%qD must take exactly two arguments", decl);
11357 /* More Effective C++ rule 7. */
11359 && (operator_code == TRUTH_ANDIF_EXPR
11360 || operator_code == TRUTH_ORIF_EXPR
11361 || operator_code == COMPOUND_EXPR))
11362 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11366 /* Effective C++ rule 23. */
11369 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11370 && (operator_code == PLUS_EXPR
11371 || operator_code == MINUS_EXPR
11372 || operator_code == TRUNC_DIV_EXPR
11373 || operator_code == MULT_EXPR
11374 || operator_code == TRUNC_MOD_EXPR)
11375 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11376 warning (OPT_Weffc__, "%qD should return by value", decl);
11378 /* [over.oper]/8 */
11379 for (; argtypes && argtypes != void_list_node;
11380 argtypes = TREE_CHAIN (argtypes))
11381 if (TREE_PURPOSE (argtypes))
11383 TREE_PURPOSE (argtypes) = NULL_TREE;
11384 if (operator_code == POSTINCREMENT_EXPR
11385 || operator_code == POSTDECREMENT_EXPR)
11387 pedwarn (input_location, OPT_Wpedantic, "%qD cannot have default arguments",
11392 error ("%qD cannot have default arguments", decl);
11400 /* Return a string giving the keyword associate with CODE. */
11402 static const char *
11403 tag_name (enum tag_types code)
11415 case typename_type:
11418 gcc_unreachable ();
11422 /* Name lookup in an elaborated-type-specifier (after the keyword
11423 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11424 elaborated-type-specifier is invalid, issue a diagnostic and return
11425 error_mark_node; otherwise, return the *_TYPE to which it referred.
11426 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11429 check_elaborated_type_specifier (enum tag_types tag_code,
11431 bool allow_template_p)
11435 if (decl == error_mark_node)
11436 return error_mark_node;
11440 struct S { struct S *p; };
11442 name lookup will find the TYPE_DECL for the implicit "S::S"
11443 typedef. Adjust for that here. */
11444 if (DECL_SELF_REFERENCE_P (decl))
11445 decl = TYPE_NAME (TREE_TYPE (decl));
11447 type = TREE_TYPE (decl);
11449 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11450 is false for this case as well. */
11451 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11453 error ("using template type parameter %qT after %qs",
11454 type, tag_name (tag_code));
11455 return error_mark_node;
11457 /* Accept template template parameters. */
11458 else if (allow_template_p
11459 && (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
11460 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM))
11464 If the identifier resolves to a typedef-name or the
11465 simple-template-id resolves to an alias template
11466 specialization, the elaborated-type-specifier is ill-formed.
11468 In other words, the only legitimate declaration to use in the
11469 elaborated type specifier is the implicit typedef created when
11470 the type is declared. */
11471 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11472 && !DECL_SELF_REFERENCE_P (decl)
11473 && tag_code != typename_type)
11475 if (alias_template_specialization_p (type))
11476 error ("using alias template specialization %qT after %qs",
11477 type, tag_name (tag_code));
11479 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11480 inform (DECL_SOURCE_LOCATION (decl),
11481 "%qD has a previous declaration here", decl);
11482 return error_mark_node;
11484 else if (TREE_CODE (type) != RECORD_TYPE
11485 && TREE_CODE (type) != UNION_TYPE
11486 && tag_code != enum_type
11487 && tag_code != typename_type)
11489 error ("%qT referred to as %qs", type, tag_name (tag_code));
11490 error ("%q+T has a previous declaration here", type);
11491 return error_mark_node;
11493 else if (TREE_CODE (type) != ENUMERAL_TYPE
11494 && tag_code == enum_type)
11496 error ("%qT referred to as enum", type);
11497 error ("%q+T has a previous declaration here", type);
11498 return error_mark_node;
11500 else if (!allow_template_p
11501 && TREE_CODE (type) == RECORD_TYPE
11502 && CLASSTYPE_IS_TEMPLATE (type))
11504 /* If a class template appears as elaborated type specifier
11505 without a template header such as:
11507 template <class T> class C {};
11508 void f(class C); // No template header here
11510 then the required template argument is missing. */
11511 error ("template argument required for %<%s %T%>",
11512 tag_name (tag_code),
11513 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11514 return error_mark_node;
11520 /* Lookup NAME in elaborate type specifier in scope according to
11521 SCOPE and issue diagnostics if necessary.
11522 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11523 found, and ERROR_MARK_NODE for type error. */
11526 lookup_and_check_tag (enum tag_types tag_code, tree name,
11527 tag_scope scope, bool template_header_p)
11531 if (scope == ts_global)
11533 /* First try ordinary name lookup, ignoring hidden class name
11534 injected via friend declaration. */
11535 decl = lookup_name_prefer_type (name, 2);
11536 /* If that fails, the name will be placed in the smallest
11537 non-class, non-function-prototype scope according to 3.3.1/5.
11538 We may already have a hidden name declared as friend in this
11539 scope. So lookup again but not ignoring hidden names.
11540 If we find one, that name will be made visible rather than
11541 creating a new tag. */
11543 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11546 decl = lookup_type_scope (name, scope);
11549 && (DECL_CLASS_TEMPLATE_P (decl)
11550 || DECL_TEMPLATE_TEMPLATE_PARM_P (decl)))
11551 decl = DECL_TEMPLATE_RESULT (decl);
11553 if (decl && TREE_CODE (decl) == TYPE_DECL)
11555 /* Look for invalid nested type:
11559 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11561 error ("%qD has the same name as the class in which it is "
11564 return error_mark_node;
11567 /* Two cases we need to consider when deciding if a class
11568 template is allowed as an elaborated type specifier:
11569 1. It is a self reference to its own class.
11570 2. It comes with a template header.
11574 template <class T> class C {
11575 class C *c1; // DECL_SELF_REFERENCE_P is true
11578 template <class U> class C; // template_header_p is true
11579 template <class T> class C<T>::D {
11580 class C *c2; // DECL_SELF_REFERENCE_P is true
11583 t = check_elaborated_type_specifier (tag_code,
11586 | DECL_SELF_REFERENCE_P (decl));
11589 else if (decl && TREE_CODE (decl) == TREE_LIST)
11591 error ("reference to %qD is ambiguous", name);
11592 print_candidates (decl);
11593 return error_mark_node;
11599 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11600 Define the tag as a forward-reference if it is not defined.
11602 If a declaration is given, process it here, and report an error if
11603 multiple declarations are not identical.
11605 SCOPE is TS_CURRENT when this is also a definition. Only look in
11606 the current frame for the name (since C++ allows new names in any
11607 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11608 declaration. Only look beginning from the current scope outward up
11609 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11611 TEMPLATE_HEADER_P is true when this declaration is preceded by
11612 a set of template parameters. */
11615 xref_tag_1 (enum tag_types tag_code, tree name,
11616 tag_scope scope, bool template_header_p)
11618 enum tree_code code;
11620 tree context = NULL_TREE;
11622 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11628 code = RECORD_TYPE;
11634 code = ENUMERAL_TYPE;
11637 gcc_unreachable ();
11640 /* In case of anonymous name, xref_tag is only called to
11641 make type node and push name. Name lookup is not required. */
11642 if (ANON_AGGRNAME_P (name))
11645 t = lookup_and_check_tag (tag_code, name,
11646 scope, template_header_p);
11648 if (t == error_mark_node)
11649 return error_mark_node;
11651 if (scope != ts_current && t && current_class_type
11652 && template_class_depth (current_class_type)
11653 && template_header_p)
11655 if (TREE_CODE (t) == TEMPLATE_TEMPLATE_PARM)
11658 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11659 definition of this tag. Since, in addition, we are currently
11660 processing a (member) template declaration of a template
11661 class, we must be very careful; consider:
11668 { template <class V>
11669 friend struct S1; };
11671 Here, the S2::S1 declaration should not be confused with the
11672 outer declaration. In particular, the inner version should
11673 have a template parameter of level 2, not level 1. This
11674 would be particularly important if the member declaration
11677 template <class V = U> friend struct S1;
11679 say, when we should tsubst into `U' when instantiating
11680 S2. On the other hand, when presented with:
11690 we must find the inner binding eventually. We
11691 accomplish this by making sure that the new type we
11692 create to represent this declaration has the right
11694 context = TYPE_CONTEXT (t);
11700 /* If no such tag is yet defined, create a forward-reference node
11701 and record it as the "definition".
11702 When a real declaration of this type is found,
11703 the forward-reference will be altered into a real type. */
11704 if (code == ENUMERAL_TYPE)
11706 error ("use of enum %q#D without previous declaration", name);
11707 return error_mark_node;
11711 t = make_class_type (code);
11712 TYPE_CONTEXT (t) = context;
11713 t = pushtag (name, t, scope);
11718 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11720 if (!redeclare_class_template (t, current_template_parms))
11721 return error_mark_node;
11723 else if (!processing_template_decl
11724 && CLASS_TYPE_P (t)
11725 && CLASSTYPE_IS_TEMPLATE (t))
11727 error ("redeclaration of %qT as a non-template", t);
11728 error ("previous declaration %q+D", t);
11729 return error_mark_node;
11732 /* Make injected friend class visible. */
11733 if (scope != ts_within_enclosing_non_class
11734 && hidden_name_p (TYPE_NAME (t)))
11736 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11737 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11739 if (TYPE_TEMPLATE_INFO (t))
11741 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11742 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11750 /* Wrapper for xref_tag_1. */
11753 xref_tag (enum tag_types tag_code, tree name,
11754 tag_scope scope, bool template_header_p)
11758 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11759 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11760 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11766 xref_tag_from_type (tree old, tree id, tag_scope scope)
11768 enum tag_types tag_kind;
11770 if (TREE_CODE (old) == RECORD_TYPE)
11771 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11773 tag_kind = union_type;
11775 if (id == NULL_TREE)
11776 id = TYPE_IDENTIFIER (old);
11778 return xref_tag (tag_kind, id, scope, false);
11781 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11782 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11783 access_* node, and the TREE_VALUE is the type of the base-class.
11784 Non-NULL TREE_TYPE indicates virtual inheritance.
11786 Returns true if the binfo hierarchy was successfully created,
11787 false if an error was detected. */
11790 xref_basetypes (tree ref, tree base_list)
11793 tree binfo, base_binfo;
11794 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11795 unsigned max_bases = 0; /* Maximum direct bases. */
11797 tree default_access;
11798 tree igo_prev; /* Track Inheritance Graph Order. */
11800 if (ref == error_mark_node)
11803 /* The base of a derived class is private by default, all others are
11805 default_access = (TREE_CODE (ref) == RECORD_TYPE
11806 && CLASSTYPE_DECLARED_CLASS (ref)
11807 ? access_private_node : access_public_node);
11809 /* First, make sure that any templates in base-classes are
11810 instantiated. This ensures that if we call ourselves recursively
11811 we do not get confused about which classes are marked and which
11813 basep = &base_list;
11816 tree basetype = TREE_VALUE (*basep);
11818 /* The dependent_type_p call below should really be dependent_scope_p
11819 so that we give a hard error about using an incomplete type as a
11820 base, but we allow it with a pedwarn for backward
11822 if (processing_template_decl
11823 && CLASS_TYPE_P (basetype) && TYPE_BEING_DEFINED (basetype))
11824 cxx_incomplete_type_diagnostic (NULL_TREE, basetype, DK_PEDWARN);
11825 if (!dependent_type_p (basetype)
11826 && !complete_type_or_else (basetype, NULL))
11827 /* An incomplete type. Remove it from the list. */
11828 *basep = TREE_CHAIN (*basep);
11832 if (TREE_TYPE (*basep))
11834 if (CLASS_TYPE_P (basetype))
11835 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11836 basep = &TREE_CHAIN (*basep);
11840 TYPE_MARKED_P (ref) = 1;
11842 /* The binfo slot should be empty, unless this is an (ill-formed)
11844 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11846 error ("redefinition of %q#T", ref);
11850 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11852 binfo = make_tree_binfo (max_bases);
11854 TYPE_BINFO (ref) = binfo;
11855 BINFO_OFFSET (binfo) = size_zero_node;
11856 BINFO_TYPE (binfo) = ref;
11858 /* Apply base-class info set up to the variants of this type. */
11859 fixup_type_variants (ref);
11863 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11864 /* An aggregate cannot have baseclasses. */
11865 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11867 if (TREE_CODE (ref) == UNION_TYPE)
11869 error ("derived union %qT invalid", ref);
11876 if (TYPE_FOR_JAVA (ref))
11878 error ("Java class %qT cannot have multiple bases", ref);
11885 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11887 if (TYPE_FOR_JAVA (ref))
11889 error ("Java class %qT cannot have virtual bases", ref);
11894 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11896 tree access = TREE_PURPOSE (base_list);
11897 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11898 tree basetype = TREE_VALUE (base_list);
11900 if (access == access_default_node)
11901 access = default_access;
11903 if (PACK_EXPANSION_P (basetype))
11904 basetype = PACK_EXPANSION_PATTERN (basetype);
11905 if (TREE_CODE (basetype) == TYPE_DECL)
11906 basetype = TREE_TYPE (basetype);
11907 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11909 error ("base type %qT fails to be a struct or class type",
11914 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11915 TYPE_FOR_JAVA (ref) = 1;
11917 base_binfo = NULL_TREE;
11918 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
11920 base_binfo = TYPE_BINFO (basetype);
11921 /* The original basetype could have been a typedef'd type. */
11922 basetype = BINFO_TYPE (base_binfo);
11924 /* Inherit flags from the base. */
11925 TYPE_HAS_NEW_OPERATOR (ref)
11926 |= TYPE_HAS_NEW_OPERATOR (basetype);
11927 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11928 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11929 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11930 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11931 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11932 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11933 CLASSTYPE_REPEATED_BASE_P (ref)
11934 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11937 /* We must do this test after we've seen through a typedef
11939 if (TYPE_MARKED_P (basetype))
11941 if (basetype == ref)
11942 error ("recursive type %qT undefined", basetype);
11944 error ("duplicate base type %qT invalid", basetype);
11948 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11949 /* Regenerate the pack expansion for the bases. */
11950 basetype = make_pack_expansion (basetype);
11952 TYPE_MARKED_P (basetype) = 1;
11954 base_binfo = copy_binfo (base_binfo, basetype, ref,
11955 &igo_prev, via_virtual);
11956 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11957 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11959 BINFO_BASE_APPEND (binfo, base_binfo);
11960 BINFO_BASE_ACCESS_APPEND (binfo, access);
11963 if (VEC_length (tree, CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
11964 /* If we didn't get max_vbases vbases, we must have shared at
11965 least one of them, and are therefore diamond shaped. */
11966 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11968 /* Unmark all the types. */
11969 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11970 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11971 TYPE_MARKED_P (ref) = 0;
11973 /* Now see if we have a repeated base type. */
11974 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11976 for (base_binfo = binfo; base_binfo;
11977 base_binfo = TREE_CHAIN (base_binfo))
11979 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11981 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11984 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11986 for (base_binfo = binfo; base_binfo;
11987 base_binfo = TREE_CHAIN (base_binfo))
11988 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11989 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11998 /* Copies the enum-related properties from type SRC to type DST.
11999 Used with the underlying type of an enum and the enum itself. */
12001 copy_type_enum (tree dst, tree src)
12004 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
12006 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
12007 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
12008 TYPE_SIZE (t) = TYPE_SIZE (src);
12009 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
12010 SET_TYPE_MODE (dst, TYPE_MODE (src));
12011 TYPE_PRECISION (t) = TYPE_PRECISION (src);
12012 TYPE_ALIGN (t) = TYPE_ALIGN (src);
12013 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
12014 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
12018 /* Begin compiling the definition of an enumeration type.
12021 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12023 UNDERLYING_TYPE is the type that will be used as the storage for
12024 the enumeration type. This should be NULL_TREE if no storage type
12027 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12029 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12031 Returns the type object, as yet incomplete.
12032 Also records info about it so that build_enumerator
12033 may be used to declare the individual values as they are read. */
12036 start_enum (tree name, tree enumtype, tree underlying_type,
12037 bool scoped_enum_p, bool *is_new)
12039 tree prevtype = NULL_TREE;
12040 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
12044 /* [C++0x dcl.enum]p5:
12046 If not explicitly specified, the underlying type of a scoped
12047 enumeration type is int. */
12048 if (!underlying_type && scoped_enum_p)
12049 underlying_type = integer_type_node;
12051 if (underlying_type)
12052 underlying_type = cv_unqualified (underlying_type);
12054 /* If this is the real definition for a previous forward reference,
12055 fill in the contents in the same object that used to be the
12056 forward reference. */
12058 enumtype = lookup_and_check_tag (enum_type, name,
12059 /*tag_scope=*/ts_current,
12060 /*template_header_p=*/false);
12062 /* In case of a template_decl, the only check that should be deferred
12063 to instantiation time is the comparison of underlying types. */
12064 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12066 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12068 error_at (input_location, "scoped/unscoped mismatch "
12069 "in enum %q#T", enumtype);
12070 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12071 "previous definition here");
12072 enumtype = error_mark_node;
12074 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12076 error_at (input_location, "underlying type mismatch "
12077 "in enum %q#T", enumtype);
12078 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12079 "previous definition here");
12080 enumtype = error_mark_node;
12082 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12083 && !dependent_type_p (underlying_type)
12084 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12085 && !same_type_p (underlying_type,
12086 ENUM_UNDERLYING_TYPE (enumtype)))
12088 error_at (input_location, "different underlying type "
12089 "in enum %q#T", enumtype);
12090 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12091 "previous definition here");
12092 underlying_type = NULL_TREE;
12096 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12097 || processing_template_decl)
12099 /* In case of error, make a dummy enum to allow parsing to
12101 if (enumtype == error_mark_node)
12103 name = make_anon_name ();
12104 enumtype = NULL_TREE;
12107 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12108 of an opaque enum, or an opaque enum of an already defined
12109 enumeration (C++0x only).
12110 In any other case, it'll be NULL_TREE. */
12116 prevtype = enumtype;
12118 /* Do not push the decl more than once, unless we need to
12119 compare underlying types at instantiation time */
12121 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12122 || (underlying_type
12123 && dependent_type_p (underlying_type))
12124 || (ENUM_UNDERLYING_TYPE (enumtype)
12125 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12127 enumtype = cxx_make_type (ENUMERAL_TYPE);
12128 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12131 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12134 if (enumtype == error_mark_node)
12135 return error_mark_node;
12137 /* The enum is considered opaque until the opening '{' of the
12138 enumerator list. */
12139 SET_OPAQUE_ENUM_P (enumtype, true);
12140 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12143 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12145 if (underlying_type)
12147 if (CP_INTEGRAL_TYPE_P (underlying_type))
12149 copy_type_enum (enumtype, underlying_type);
12150 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12152 else if (dependent_type_p (underlying_type))
12153 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12155 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12156 underlying_type, enumtype);
12159 /* If into a template class, the returned enum is always the first
12160 declaration (opaque or not) seen. This way all the references to
12161 this type will be to the same declaration. The following ones are used
12162 only to check for definition errors. */
12163 if (prevtype && processing_template_decl)
12169 /* After processing and defining all the values of an enumeration type,
12170 install their decls in the enumeration type.
12171 ENUMTYPE is the type object. */
12174 finish_enum_value_list (tree enumtype)
12177 tree underlying_type;
12180 tree minnode, maxnode;
12183 bool fixed_underlying_type_p
12184 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12186 /* We built up the VALUES in reverse order. */
12187 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12189 /* For an enum defined in a template, just set the type of the values;
12190 all further processing is postponed until the template is
12191 instantiated. We need to set the type so that tsubst of a CONST_DECL
12193 if (processing_template_decl)
12195 for (values = TYPE_VALUES (enumtype);
12197 values = TREE_CHAIN (values))
12198 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12202 /* Determine the minimum and maximum values of the enumerators. */
12203 if (TYPE_VALUES (enumtype))
12205 minnode = maxnode = NULL_TREE;
12207 for (values = TYPE_VALUES (enumtype);
12209 values = TREE_CHAIN (values))
12211 decl = TREE_VALUE (values);
12213 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12214 each enumerator has the type of its enumeration. Prior to the
12215 closing brace, the type of each enumerator is the type of its
12216 initializing value. */
12217 TREE_TYPE (decl) = enumtype;
12219 /* Update the minimum and maximum values, if appropriate. */
12220 value = DECL_INITIAL (decl);
12221 if (value == error_mark_node)
12222 value = integer_zero_node;
12223 /* Figure out what the minimum and maximum values of the
12224 enumerators are. */
12226 minnode = maxnode = value;
12227 else if (tree_int_cst_lt (maxnode, value))
12229 else if (tree_int_cst_lt (value, minnode))
12236 If the enumerator-list is empty, the underlying type is as if
12237 the enumeration had a single enumerator with value 0. */
12238 minnode = maxnode = integer_zero_node;
12240 if (!fixed_underlying_type_p)
12242 /* Compute the number of bits require to represent all values of the
12243 enumeration. We must do this before the type of MINNODE and
12244 MAXNODE are transformed, since tree_int_cst_min_precision relies
12245 on the TREE_TYPE of the value it is passed. */
12246 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12247 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12248 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12249 int precision = MAX (lowprec, highprec);
12251 bool use_short_enum;
12253 /* Determine the underlying type of the enumeration.
12257 The underlying type of an enumeration is an integral type that
12258 can represent all the enumerator values defined in the
12259 enumeration. It is implementation-defined which integral type is
12260 used as the underlying type for an enumeration except that the
12261 underlying type shall not be larger than int unless the value of
12262 an enumerator cannot fit in an int or unsigned int.
12264 We use "int" or an "unsigned int" as the underlying type, even if
12265 a smaller integral type would work, unless the user has
12266 explicitly requested that we use the smallest possible type. The
12267 user can request that for all enumerations with a command line
12268 flag, or for just one enumeration with an attribute. */
12270 use_short_enum = flag_short_enums
12271 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12273 for (itk = (use_short_enum ? itk_char : itk_int);
12277 underlying_type = integer_types[itk];
12278 if (underlying_type != NULL_TREE
12279 && TYPE_PRECISION (underlying_type) >= precision
12280 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12283 if (itk == itk_none)
12287 IF no integral type can represent all the enumerator values, the
12288 enumeration is ill-formed. */
12289 error ("no integral type can represent all of the enumerator values "
12290 "for %qT", enumtype);
12291 precision = TYPE_PRECISION (long_long_integer_type_node);
12292 underlying_type = integer_types[itk_unsigned_long_long];
12297 The value of sizeof() applied to an enumeration type, an object
12298 of an enumeration type, or an enumerator, is the value of sizeof()
12299 applied to the underlying type. */
12300 copy_type_enum (enumtype, underlying_type);
12302 /* Compute the minimum and maximum values for the type.
12306 For an enumeration where emin is the smallest enumerator and emax
12307 is the largest, the values of the enumeration are the values of the
12308 underlying type in the range bmin to bmax, where bmin and bmax are,
12309 respectively, the smallest and largest values of the smallest bit-
12310 field that can store emin and emax. */
12312 /* The middle-end currently assumes that types with TYPE_PRECISION
12313 narrower than their underlying type are suitably zero or sign
12314 extended to fill their mode. Similarly, it assumes that the front
12315 end assures that a value of a particular type must be within
12316 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12318 We used to set these fields based on bmin and bmax, but that led
12319 to invalid assumptions like optimizing away bounds checking. So
12320 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12321 TYPE_MAX_VALUE to the values for the mode above and only restrict
12322 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12323 ENUM_UNDERLYING_TYPE (enumtype)
12324 = build_distinct_type_copy (underlying_type);
12325 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12326 set_min_and_max_values_for_integral_type
12327 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12329 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12330 if (flag_strict_enums)
12331 set_min_and_max_values_for_integral_type (enumtype, precision,
12335 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12337 /* Convert each of the enumerators to the type of the underlying
12338 type of the enumeration. */
12339 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12341 location_t saved_location;
12343 decl = TREE_VALUE (values);
12344 saved_location = input_location;
12345 input_location = DECL_SOURCE_LOCATION (decl);
12346 if (fixed_underlying_type_p)
12347 /* If the enumeration type has a fixed underlying type, we
12348 already checked all of the enumerator values. */
12349 value = DECL_INITIAL (decl);
12351 value = perform_implicit_conversion (underlying_type,
12352 DECL_INITIAL (decl),
12353 tf_warning_or_error);
12354 input_location = saved_location;
12356 /* Do not clobber shared ints. */
12357 value = copy_node (value);
12359 TREE_TYPE (value) = enumtype;
12360 DECL_INITIAL (decl) = value;
12363 /* Fix up all variant types of this enum type. */
12364 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12365 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12367 if (at_class_scope_p ()
12368 && COMPLETE_TYPE_P (current_class_type)
12369 && UNSCOPED_ENUM_P (enumtype))
12370 insert_late_enum_def_into_classtype_sorted_fields (enumtype,
12371 current_class_type);
12373 /* Finish debugging output for this type. */
12374 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12377 /* Finishes the enum type. This is called only the first time an
12378 enumeration is seen, be it opaque or odinary.
12379 ENUMTYPE is the type object. */
12382 finish_enum (tree enumtype)
12384 if (processing_template_decl)
12386 if (at_function_scope_p ())
12387 add_stmt (build_min (TAG_DEFN, enumtype));
12391 /* If this is a forward declaration, there should not be any variants,
12392 though we can get a variant in the middle of an enum-specifier with
12393 wacky code like 'enum E { e = sizeof(const E*) };' */
12394 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12395 && (TYPE_VALUES (enumtype)
12396 || !TYPE_NEXT_VARIANT (enumtype)));
12399 /* Build and install a CONST_DECL for an enumeration constant of the
12400 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12401 LOC is the location of NAME.
12402 Assignment of sequential values by default is handled here. */
12405 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12411 /* If the VALUE was erroneous, pretend it wasn't there; that will
12412 result in the enum being assigned the next value in sequence. */
12413 if (value == error_mark_node)
12416 /* Remove no-op casts from the value. */
12418 STRIP_TYPE_NOPS (value);
12420 if (! processing_template_decl)
12422 /* Validate and default VALUE. */
12423 if (value != NULL_TREE)
12425 value = cxx_constant_value (value);
12427 if (TREE_CODE (value) != INTEGER_CST
12428 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12430 error ("enumerator value for %qD is not an integer constant",
12436 /* Default based on previous value. */
12437 if (value == NULL_TREE)
12439 if (TYPE_VALUES (enumtype))
12442 unsigned HOST_WIDE_INT lo;
12446 /* C++03 7.2/4: If no initializer is specified for the first
12447 enumerator, the type is an unspecified integral
12448 type. Otherwise the type is the same as the type of the
12449 initializing value of the preceding enumerator unless the
12450 incremented value is not representable in that type, in
12451 which case the type is an unspecified integral type
12452 sufficient to contain the incremented value. */
12453 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12454 if (error_operand_p (prev_value))
12455 value = error_mark_node;
12458 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12459 TREE_INT_CST_HIGH (prev_value),
12464 tree type = TREE_TYPE (prev_value);
12465 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12466 di.low = lo; di.high = hi;
12467 if (!double_int_fits_to_tree_p (type, di))
12470 for (itk = itk_int; itk != itk_none; itk++)
12472 type = integer_types[itk];
12473 if (type != NULL_TREE
12474 && (pos || !TYPE_UNSIGNED (type))
12475 && double_int_fits_to_tree_p (type, di))
12478 if (type && cxx_dialect < cxx0x
12479 && itk > itk_unsigned_long)
12480 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12481 incremented enumerator value is too large for %<unsigned long%>" : "\
12482 incremented enumerator value is too large for %<long%>");
12484 if (type == NULL_TREE)
12487 value = double_int_to_tree (type, di);
12492 error ("overflow in enumeration values at %qD", name);
12493 value = error_mark_node;
12498 value = integer_zero_node;
12501 /* Remove no-op casts from the value. */
12502 STRIP_TYPE_NOPS (value);
12504 /* If the underlying type of the enum is fixed, check whether
12505 the enumerator values fits in the underlying type. If it
12506 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12507 if (ENUM_UNDERLYING_TYPE (enumtype)
12509 && TREE_CODE (value) == INTEGER_CST
12510 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12512 error ("enumerator value %E is too large for underlying type %<%T%>",
12513 value, ENUM_UNDERLYING_TYPE (enumtype));
12515 /* Silently convert the value so that we can continue. */
12516 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12521 /* C++ associates enums with global, function, or class declarations. */
12522 context = current_scope ();
12524 /* Build the actual enumeration constant. Note that the enumeration
12525 constants have the underlying type of the enum (if it is fixed)
12526 or the type of their initializer (if the underlying type of the
12527 enum is not fixed):
12531 If the underlying type is fixed, the type of each enumerator
12532 prior to the closing brace is the underlying type; if the
12533 initializing value of an enumerator cannot be represented by
12534 the underlying type, the program is ill-formed. If the
12535 underlying type is not fixed, the type of each enumerator is
12536 the type of its initializing value.
12538 If the underlying type is not fixed, it will be computed by
12539 finish_enum and we will reset the type of this enumerator. Of
12540 course, if we're processing a template, there may be no value. */
12541 type = value ? TREE_TYPE (value) : NULL_TREE;
12543 decl = build_decl (loc, CONST_DECL, name, type);
12545 DECL_CONTEXT (decl) = enumtype;
12546 TREE_CONSTANT (decl) = 1;
12547 TREE_READONLY (decl) = 1;
12548 DECL_INITIAL (decl) = value;
12550 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12551 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12552 on the TYPE_FIELDS list for `S'. (That's so that you can say
12553 things like `S::i' later.) */
12554 finish_member_declaration (decl);
12558 /* Add this enumeration constant to the list for this type. */
12559 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12562 /* Look for an enumerator with the given NAME within the enumeration
12563 type ENUMTYPE. This routine is used primarily for qualified name
12564 lookup into an enumerator in C++0x, e.g.,
12566 enum class Color { Red, Green, Blue };
12568 Color color = Color::Red;
12570 Returns the value corresponding to the enumerator, or
12571 NULL_TREE if no such enumerator was found. */
12573 lookup_enumerator (tree enumtype, tree name)
12576 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12578 e = purpose_member (name, TYPE_VALUES (enumtype));
12579 return e? TREE_VALUE (e) : NULL_TREE;
12583 /* We're defining DECL. Make sure that its type is OK. */
12586 check_function_type (tree decl, tree current_function_parms)
12588 tree fntype = TREE_TYPE (decl);
12589 tree return_type = complete_type (TREE_TYPE (fntype));
12591 /* In a function definition, arg types must be complete. */
12592 require_complete_types_for_parms (current_function_parms);
12594 if (dependent_type_p (return_type)
12595 || type_uses_auto (return_type))
12597 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12598 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12600 tree args = TYPE_ARG_TYPES (fntype);
12602 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12603 error ("return type %q#T is incomplete", return_type);
12605 error ("return type has Java class type %q#T", return_type);
12607 /* Make it return void instead. */
12608 if (TREE_CODE (fntype) == METHOD_TYPE)
12609 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12611 TREE_CHAIN (args));
12613 fntype = build_function_type (void_type_node, args);
12615 = build_exception_variant (fntype,
12616 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12617 fntype = (cp_build_type_attribute_variant
12618 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12619 TREE_TYPE (decl) = fntype;
12622 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12625 /* Create the FUNCTION_DECL for a function definition.
12626 DECLSPECS and DECLARATOR are the parts of the declaration;
12627 they describe the function's name and the type it returns,
12628 but twisted together in a fashion that parallels the syntax of C.
12630 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12631 DECLARATOR is really the DECL for the function we are about to
12632 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12633 indicating that the function is an inline defined in-class.
12635 This function creates a binding context for the function body
12636 as well as setting up the FUNCTION_DECL in current_function_decl.
12638 For C++, we must first check whether that datum makes any sense.
12639 For example, "class A local_a(1,2);" means that variable local_a
12640 is an aggregate of type A, which should have a constructor
12641 applied to it with the argument list [1, 2].
12643 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12644 or may be a BLOCK if the function has been defined previously
12645 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12646 error_mark_node if the function has never been defined, or
12647 a BLOCK if the function has been defined somewhere. */
12650 start_preparsed_function (tree decl1, tree attrs, int flags)
12652 tree ctype = NULL_TREE;
12655 int doing_friend = 0;
12656 cp_binding_level *bl;
12657 tree current_function_parms;
12658 struct c_fileinfo *finfo
12659 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12660 bool honor_interface;
12662 /* Sanity check. */
12663 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12664 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12666 fntype = TREE_TYPE (decl1);
12667 if (TREE_CODE (fntype) == METHOD_TYPE)
12668 ctype = TYPE_METHOD_BASETYPE (fntype);
12670 /* ISO C++ 11.4/5. A friend function defined in a class is in
12671 the (lexical) scope of the class in which it is defined. */
12672 if (!ctype && DECL_FRIEND_P (decl1))
12674 ctype = DECL_FRIEND_CONTEXT (decl1);
12676 /* CTYPE could be null here if we're dealing with a template;
12677 for example, `inline friend float foo()' inside a template
12678 will have no CTYPE set. */
12679 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12685 if (DECL_DECLARED_INLINE_P (decl1)
12686 && lookup_attribute ("noinline", attrs))
12687 warning (0, "inline function %q+D given attribute noinline", decl1);
12689 /* Handle gnu_inline attribute. */
12690 if (GNU_INLINE_P (decl1))
12692 DECL_EXTERNAL (decl1) = 1;
12693 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12694 DECL_INTERFACE_KNOWN (decl1) = 1;
12695 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12698 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12699 /* This is a constructor, we must ensure that any default args
12700 introduced by this definition are propagated to the clones
12701 now. The clones are used directly in overload resolution. */
12702 adjust_clone_args (decl1);
12704 /* Sometimes we don't notice that a function is a static member, and
12705 build a METHOD_TYPE for it. Fix that up now. */
12706 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12707 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12709 /* Set up current_class_type, and enter the scope of the class, if
12712 push_nested_class (ctype);
12713 else if (DECL_STATIC_FUNCTION_P (decl1))
12714 push_nested_class (DECL_CONTEXT (decl1));
12716 /* Now that we have entered the scope of the class, we must restore
12717 the bindings for any template parameters surrounding DECL1, if it
12718 is an inline member template. (Order is important; consider the
12719 case where a template parameter has the same name as a field of
12720 the class.) It is not until after this point that
12721 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12722 if (flags & SF_INCLASS_INLINE)
12723 maybe_begin_member_template_processing (decl1);
12725 /* Effective C++ rule 15. */
12727 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12728 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12729 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12731 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12732 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12733 if (!DECL_INITIAL (decl1))
12734 DECL_INITIAL (decl1) = error_mark_node;
12736 /* This function exists in static storage.
12737 (This does not mean `static' in the C sense!) */
12738 TREE_STATIC (decl1) = 1;
12740 /* We must call push_template_decl after current_class_type is set
12741 up. (If we are processing inline definitions after exiting a
12742 class scope, current_class_type will be NULL_TREE until set above
12743 by push_nested_class.) */
12744 if (processing_template_decl)
12746 /* FIXME: Handle error_mark_node more gracefully. */
12747 tree newdecl1 = push_template_decl (decl1);
12748 if (newdecl1 != error_mark_node)
12752 /* We are now in the scope of the function being defined. */
12753 current_function_decl = decl1;
12755 /* Save the parm names or decls from this function's declarator
12756 where store_parm_decls will find them. */
12757 current_function_parms = DECL_ARGUMENTS (decl1);
12759 /* Make sure the parameter and return types are reasonable. When
12760 you declare a function, these types can be incomplete, but they
12761 must be complete when you define the function. */
12762 check_function_type (decl1, current_function_parms);
12764 /* Build the return declaration for the function. */
12765 restype = TREE_TYPE (fntype);
12767 if (DECL_RESULT (decl1) == NULL_TREE)
12771 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12772 DECL_ARTIFICIAL (resdecl) = 1;
12773 DECL_IGNORED_P (resdecl) = 1;
12774 DECL_RESULT (decl1) = resdecl;
12776 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12779 /* Let the user know we're compiling this function. */
12780 announce_function (decl1);
12782 /* Record the decl so that the function name is defined.
12783 If we already have a decl for this name, and it is a FUNCTION_DECL,
12784 use the old decl. */
12785 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12787 /* A specialization is not used to guide overload resolution. */
12788 if (!DECL_FUNCTION_MEMBER_P (decl1)
12789 && !(DECL_USE_TEMPLATE (decl1) &&
12790 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12792 tree olddecl = pushdecl (decl1);
12794 if (olddecl == error_mark_node)
12795 /* If something went wrong when registering the declaration,
12796 use DECL1; we have to have a FUNCTION_DECL to use when
12797 parsing the body of the function. */
12801 /* Otherwise, OLDDECL is either a previous declaration
12802 of the same function or DECL1 itself. */
12804 if (warn_missing_declarations
12805 && olddecl == decl1
12806 && !DECL_MAIN_P (decl1)
12807 && TREE_PUBLIC (decl1)
12808 && !DECL_DECLARED_INLINE_P (decl1))
12812 /* Check whether DECL1 is in an anonymous
12814 for (context = DECL_CONTEXT (decl1);
12816 context = DECL_CONTEXT (context))
12818 if (TREE_CODE (context) == NAMESPACE_DECL
12819 && DECL_NAME (context) == NULL_TREE)
12823 if (context == NULL)
12824 warning (OPT_Wmissing_declarations,
12825 "no previous declaration for %q+D", decl1);
12833 /* We need to set the DECL_CONTEXT. */
12834 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12835 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12837 fntype = TREE_TYPE (decl1);
12839 /* If #pragma weak applies, mark the decl appropriately now.
12840 The pragma only applies to global functions. Because
12841 determining whether or not the #pragma applies involves
12842 computing the mangled name for the declaration, we cannot
12843 apply the pragma until after we have merged this declaration
12844 with any previous declarations; if the original declaration
12845 has a linkage specification, that specification applies to
12846 the definition as well, and may affect the mangled name. */
12847 if (DECL_FILE_SCOPE_P (decl1))
12848 maybe_apply_pragma_weak (decl1);
12851 /* Reset this in case the call to pushdecl changed it. */
12852 current_function_decl = decl1;
12854 gcc_assert (DECL_INITIAL (decl1));
12856 /* This function may already have been parsed, in which case just
12857 return; our caller will skip over the body without parsing. */
12858 if (DECL_INITIAL (decl1) != error_mark_node)
12861 /* Initialize RTL machinery. We cannot do this until
12862 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12863 even when processing a template; this is how we get
12864 CFUN set up, and our per-function variables initialized.
12865 FIXME factor out the non-RTL stuff. */
12866 bl = current_binding_level;
12867 allocate_struct_function (decl1, processing_template_decl);
12869 /* Initialize the language data structures. Whenever we start
12870 a new function, we destroy temporaries in the usual way. */
12871 cfun->language = ggc_alloc_cleared_language_function ();
12872 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12873 current_binding_level = bl;
12875 if (!processing_template_decl && type_uses_auto (restype))
12877 FNDECL_USED_AUTO (decl1) = true;
12878 current_function_auto_return_pattern = restype;
12881 /* Start the statement-tree, start the tree now. */
12882 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12884 /* If we are (erroneously) defining a function that we have already
12885 defined before, wipe out what we knew before. */
12886 if (!DECL_PENDING_INLINE_P (decl1))
12887 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12889 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12891 /* We know that this was set up by `grokclassfn'. We do not
12892 wait until `store_parm_decls', since evil parse errors may
12893 never get us to that point. Here we keep the consistency
12894 between `current_class_type' and `current_class_ptr'. */
12895 tree t = DECL_ARGUMENTS (decl1);
12897 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12898 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12900 cp_function_chain->x_current_class_ref
12901 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12902 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12903 cp_function_chain->x_current_class_ptr = t;
12905 /* Constructors and destructors need to know whether they're "in
12906 charge" of initializing virtual base classes. */
12907 t = DECL_CHAIN (t);
12908 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12910 current_in_charge_parm = t;
12911 t = DECL_CHAIN (t);
12913 if (DECL_HAS_VTT_PARM_P (decl1))
12915 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12916 current_vtt_parm = t;
12920 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12921 /* Implicitly-defined methods (like the
12922 destructor for a class in which no destructor
12923 is explicitly declared) must not be defined
12924 until their definition is needed. So, we
12925 ignore interface specifications for
12926 compiler-generated functions. */
12927 && !DECL_ARTIFICIAL (decl1));
12929 if (processing_template_decl)
12930 /* Don't mess with interface flags. */;
12931 else if (DECL_INTERFACE_KNOWN (decl1))
12933 tree ctx = decl_function_context (decl1);
12935 if (DECL_NOT_REALLY_EXTERN (decl1))
12936 DECL_EXTERNAL (decl1) = 0;
12938 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12939 && TREE_PUBLIC (ctx))
12940 /* This is a function in a local class in an extern inline
12942 comdat_linkage (decl1);
12944 /* If this function belongs to an interface, it is public.
12945 If it belongs to someone else's interface, it is also external.
12946 This only affects inlines and template instantiations. */
12947 else if (!finfo->interface_unknown && honor_interface)
12949 if (DECL_DECLARED_INLINE_P (decl1)
12950 || DECL_TEMPLATE_INSTANTIATION (decl1))
12952 DECL_EXTERNAL (decl1)
12953 = (finfo->interface_only
12954 || (DECL_DECLARED_INLINE_P (decl1)
12955 && ! flag_implement_inlines
12956 && !DECL_VINDEX (decl1)));
12958 /* For WIN32 we also want to put these in linkonce sections. */
12959 maybe_make_one_only (decl1);
12962 DECL_EXTERNAL (decl1) = 0;
12963 DECL_INTERFACE_KNOWN (decl1) = 1;
12964 /* If this function is in an interface implemented in this file,
12965 make sure that the back end knows to emit this function
12967 if (!DECL_EXTERNAL (decl1))
12968 mark_needed (decl1);
12970 else if (finfo->interface_unknown && finfo->interface_only
12971 && honor_interface)
12973 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12974 interface, we will have both finfo->interface_unknown and
12975 finfo->interface_only set. In that case, we don't want to
12976 use the normal heuristics because someone will supply a
12977 #pragma implementation elsewhere, and deducing it here would
12978 produce a conflict. */
12979 comdat_linkage (decl1);
12980 DECL_EXTERNAL (decl1) = 0;
12981 DECL_INTERFACE_KNOWN (decl1) = 1;
12982 DECL_DEFER_OUTPUT (decl1) = 1;
12986 /* This is a definition, not a reference.
12987 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12988 if (!GNU_INLINE_P (decl1))
12989 DECL_EXTERNAL (decl1) = 0;
12991 if ((DECL_DECLARED_INLINE_P (decl1)
12992 || DECL_TEMPLATE_INSTANTIATION (decl1))
12993 && ! DECL_INTERFACE_KNOWN (decl1))
12994 DECL_DEFER_OUTPUT (decl1) = 1;
12996 DECL_INTERFACE_KNOWN (decl1) = 1;
12999 /* Determine the ELF visibility attribute for the function. We must not
13000 do this before calling "pushdecl", as we must allow "duplicate_decls"
13001 to merge any attributes appropriately. We also need to wait until
13003 if (!DECL_CLONED_FUNCTION_P (decl1))
13004 determine_visibility (decl1);
13006 begin_scope (sk_function_parms, decl1);
13010 if (DECL_DESTRUCTOR_P (decl1)
13011 || (DECL_CONSTRUCTOR_P (decl1)
13012 && targetm.cxx.cdtor_returns_this ()))
13014 cdtor_label = build_decl (input_location,
13015 LABEL_DECL, NULL_TREE, NULL_TREE);
13016 DECL_CONTEXT (cdtor_label) = current_function_decl;
13019 start_fname_decls ();
13021 store_parm_decls (current_function_parms);
13025 /* Like start_preparsed_function, except that instead of a
13026 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13028 Returns 1 on success. If the DECLARATOR is not suitable for a function
13029 (it defines a datum instead), we return 0, which tells
13030 yyparse to report a parse error. */
13033 start_function (cp_decl_specifier_seq *declspecs,
13034 const cp_declarator *declarator,
13039 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13040 if (decl1 == error_mark_node)
13042 /* If the declarator is not suitable for a function definition,
13043 cause a syntax error. */
13044 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13046 error ("invalid function declaration");
13050 if (DECL_MAIN_P (decl1))
13051 /* main must return int. grokfndecl should have corrected it
13052 (and issued a diagnostic) if the user got it wrong. */
13053 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13054 integer_type_node));
13056 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13061 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13065 use_eh_spec_block (tree fn)
13067 return (flag_exceptions && flag_enforce_eh_specs
13068 && !processing_template_decl
13069 && !type_throw_all_p (TREE_TYPE (fn))
13070 /* We insert the EH_SPEC_BLOCK only in the original
13071 function; then, it is copied automatically to the
13073 && !DECL_CLONED_FUNCTION_P (fn)
13074 /* Implicitly-generated constructors and destructors have
13075 exception specifications. However, those specifications
13076 are the union of the possible exceptions specified by the
13077 constructors/destructors for bases and members, so no
13078 unallowed exception will ever reach this function. By
13079 not creating the EH_SPEC_BLOCK we save a little memory,
13080 and we avoid spurious warnings about unreachable
13082 && !DECL_DEFAULTED_FN (fn));
13085 /* Store the parameter declarations into the current function declaration.
13086 This is called after parsing the parameter declarations, before
13087 digesting the body of the function.
13089 Also install to binding contour return value identifier, if any. */
13092 store_parm_decls (tree current_function_parms)
13094 tree fndecl = current_function_decl;
13097 /* This is a chain of any other decls that came in among the parm
13098 declarations. If a parm is declared with enum {foo, bar} x;
13099 then CONST_DECLs for foo and bar are put here. */
13100 tree nonparms = NULL_TREE;
13102 if (current_function_parms)
13104 /* This case is when the function was defined with an ANSI prototype.
13105 The parms already have decls, so we need not do anything here
13106 except record them as in effect
13107 and complain if any redundant old-style parm decls were written. */
13109 tree specparms = current_function_parms;
13112 /* Must clear this because it might contain TYPE_DECLs declared
13114 current_binding_level->names = NULL;
13116 /* If we're doing semantic analysis, then we'll call pushdecl
13117 for each of these. We must do them in reverse order so that
13118 they end in the correct forward order. */
13119 specparms = nreverse (specparms);
13121 for (parm = specparms; parm; parm = next)
13123 next = DECL_CHAIN (parm);
13124 if (TREE_CODE (parm) == PARM_DECL)
13126 if (DECL_NAME (parm) == NULL_TREE
13127 || TREE_CODE (parm) != VOID_TYPE)
13130 error ("parameter %qD declared void", parm);
13134 /* If we find an enum constant or a type tag,
13135 put it aside for the moment. */
13136 TREE_CHAIN (parm) = NULL_TREE;
13137 nonparms = chainon (nonparms, parm);
13141 /* Get the decls in their original chain order and record in the
13142 function. This is all and only the PARM_DECLs that were
13143 pushed into scope by the loop above. */
13144 DECL_ARGUMENTS (fndecl) = getdecls ();
13147 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13149 /* Now store the final chain of decls for the arguments
13150 as the decl-chain of the current lexical scope.
13151 Put the enumerators in as well, at the front so that
13152 DECL_ARGUMENTS is not modified. */
13153 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13155 if (use_eh_spec_block (current_function_decl))
13156 current_eh_spec_block = begin_eh_spec_block ();
13160 /* We have finished doing semantic analysis on DECL, but have not yet
13161 generated RTL for its body. Save away our current state, so that
13162 when we want to generate RTL later we know what to do. */
13165 save_function_data (tree decl)
13167 struct language_function *f;
13169 /* Save the language-specific per-function data so that we can
13170 get it back when we really expand this function. */
13171 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13174 f = ggc_alloc_language_function ();
13175 memcpy (f, cp_function_chain, sizeof (struct language_function));
13176 DECL_SAVED_FUNCTION_DATA (decl) = f;
13178 /* Clear out the bits we don't need. */
13179 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13180 f->bindings = NULL;
13181 f->x_local_names = NULL;
13182 f->base.local_typedefs = NULL;
13186 /* Set the return value of the constructor (if present). */
13189 finish_constructor_body (void)
13194 if (targetm.cxx.cdtor_returns_this ()
13195 && (! TYPE_FOR_JAVA (current_class_type)))
13197 /* Any return from a constructor will end up here. */
13198 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13200 val = DECL_ARGUMENTS (current_function_decl);
13201 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13202 DECL_RESULT (current_function_decl), val);
13203 /* Return the address of the object. */
13204 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13205 add_stmt (exprstmt);
13209 /* Do all the processing for the beginning of a destructor; set up the
13210 vtable pointers and cleanups for bases and members. */
13213 begin_destructor_body (void)
13215 tree compound_stmt;
13217 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13218 issued an error message. We still want to try to process the
13219 body of the function, but initialize_vtbl_ptrs will crash if
13220 TYPE_BINFO is NULL. */
13221 if (COMPLETE_TYPE_P (current_class_type))
13223 compound_stmt = begin_compound_stmt (0);
13224 /* Make all virtual function table pointers in non-virtual base
13225 classes point to CURRENT_CLASS_TYPE's virtual function
13227 initialize_vtbl_ptrs (current_class_ptr);
13228 finish_compound_stmt (compound_stmt);
13230 /* And insert cleanups for our bases and members so that they
13231 will be properly destroyed if we throw. */
13232 push_base_cleanups ();
13236 /* At the end of every destructor we generate code to delete the object if
13237 necessary. Do that now. */
13240 finish_destructor_body (void)
13244 /* Any return from a destructor will end up here; that way all base
13245 and member cleanups will be run when the function returns. */
13246 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13248 /* In a virtual destructor, we must call delete. */
13249 if (DECL_VIRTUAL_P (current_function_decl))
13252 tree virtual_size = cxx_sizeof (current_class_type);
13256 At the point of definition of a virtual destructor (including
13257 an implicit definition), non-placement operator delete shall
13258 be looked up in the scope of the destructor's class and if
13259 found shall be accessible and unambiguous. */
13260 exprstmt = build_op_delete_call (DELETE_EXPR, current_class_ptr,
13262 /*global_p=*/false,
13263 /*placement=*/NULL_TREE,
13264 /*alloc_fn=*/NULL_TREE,
13265 tf_warning_or_error);
13267 if_stmt = begin_if_stmt ();
13268 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13269 current_in_charge_parm,
13272 finish_expr_stmt (exprstmt);
13273 finish_then_clause (if_stmt);
13274 finish_if_stmt (if_stmt);
13277 if (targetm.cxx.cdtor_returns_this ())
13281 val = DECL_ARGUMENTS (current_function_decl);
13282 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13283 DECL_RESULT (current_function_decl), val);
13284 /* Return the address of the object. */
13285 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13286 add_stmt (exprstmt);
13290 /* Do the necessary processing for the beginning of a function body, which
13291 in this case includes member-initializers, but not the catch clauses of
13292 a function-try-block. Currently, this means opening a binding level
13293 for the member-initializers (in a ctor), member cleanups (in a dtor),
13294 and capture proxies (in a lambda operator()). */
13297 begin_function_body (void)
13301 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13304 if (processing_template_decl)
13305 /* Do nothing now. */;
13307 /* Always keep the BLOCK node associated with the outermost pair of
13308 curly braces of a function. These are needed for correct
13309 operation of dwarfout.c. */
13310 keep_next_level (true);
13312 stmt = begin_compound_stmt (BCS_FN_BODY);
13314 if (processing_template_decl)
13315 /* Do nothing now. */;
13316 else if (DECL_DESTRUCTOR_P (current_function_decl))
13317 begin_destructor_body ();
13322 /* Do the processing for the end of a function body. Currently, this means
13323 closing out the cleanups for fully-constructed bases and members, and in
13324 the case of the destructor, deleting the object if desired. Again, this
13325 is only meaningful for [cd]tors, since they are the only functions where
13326 there is a significant distinction between the main body and any
13327 function catch clauses. Handling, say, main() return semantics here
13328 would be wrong, as flowing off the end of a function catch clause for
13329 main() would also need to return 0. */
13332 finish_function_body (tree compstmt)
13334 if (compstmt == NULL_TREE)
13337 /* Close the block. */
13338 finish_compound_stmt (compstmt);
13340 if (processing_template_decl)
13341 /* Do nothing now. */;
13342 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13343 finish_constructor_body ();
13344 else if (DECL_DESTRUCTOR_P (current_function_decl))
13345 finish_destructor_body ();
13348 /* Given a function, returns the BLOCK corresponding to the outermost level
13349 of curly braces, skipping the artificial block created for constructor
13353 outer_curly_brace_block (tree fndecl)
13355 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13356 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13357 /* Skip the artificial function body block. */
13358 block = BLOCK_SUBBLOCKS (block);
13362 /* If FNDECL is a class's key method, add the class to the list of
13363 keyed classes that should be emitted. */
13366 record_key_method_defined (tree fndecl)
13368 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13369 && DECL_VIRTUAL_P (fndecl)
13370 && !processing_template_decl)
13372 tree fnclass = DECL_CONTEXT (fndecl);
13373 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13374 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13378 /* Subroutine of finish_function.
13379 Save the body of constexpr functions for possible
13380 future compile time evaluation. */
13383 maybe_save_function_definition (tree fun)
13385 if (!processing_template_decl
13386 && DECL_DECLARED_CONSTEXPR_P (fun)
13387 && !DECL_CLONED_FUNCTION_P (fun))
13388 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13391 /* Finish up a function declaration and compile that function
13392 all the way to assembler language output. The free the storage
13393 for the function definition.
13395 FLAGS is a bitwise or of the following values:
13397 We just finished processing the body of an in-class inline
13398 function definition. (This processing will have taken place
13399 after the class definition is complete.) */
13402 finish_function (int flags)
13404 tree fndecl = current_function_decl;
13405 tree fntype, ctype = NULL_TREE;
13406 int inclass_inline = (flags & 2) != 0;
13408 /* When we get some parse errors, we can end up without a
13409 current_function_decl, so cope. */
13410 if (fndecl == NULL_TREE)
13411 return error_mark_node;
13413 if (c_dialect_objc ())
13414 objc_finish_function ();
13416 gcc_assert (!defer_mark_used_calls);
13417 defer_mark_used_calls = true;
13419 record_key_method_defined (fndecl);
13421 fntype = TREE_TYPE (fndecl);
13423 /* TREE_READONLY (fndecl) = 1;
13424 This caused &foo to be of type ptr-to-const-function
13425 which then got a warning when stored in a ptr-to-function variable. */
13427 gcc_assert (building_stmt_list_p ());
13428 /* The current function is being defined, so its DECL_INITIAL should
13429 be set, and unless there's a multiple definition, it should be
13430 error_mark_node. */
13431 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13433 /* For a cloned function, we've already got all the code we need;
13434 there's no need to add any extra bits. */
13435 if (!DECL_CLONED_FUNCTION_P (fndecl))
13437 /* Make it so that `main' always returns 0 by default. */
13438 if (DECL_MAIN_P (current_function_decl))
13439 finish_return_stmt (integer_zero_node);
13441 if (use_eh_spec_block (current_function_decl))
13442 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13443 (TREE_TYPE (current_function_decl)),
13444 current_eh_spec_block);
13447 /* If we're saving up tree structure, tie off the function now. */
13448 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13450 finish_fname_decls ();
13452 /* If this function can't throw any exceptions, remember that. */
13453 if (!processing_template_decl
13454 && !cp_function_chain->can_throw
13455 && !flag_non_call_exceptions
13456 && !decl_replaceable_p (fndecl))
13457 TREE_NOTHROW (fndecl) = 1;
13459 /* This must come after expand_function_end because cleanups might
13460 have declarations (from inline functions) that need to go into
13461 this function's blocks. */
13463 /* If the current binding level isn't the outermost binding level
13464 for this function, either there is a bug, or we have experienced
13465 syntax errors and the statement tree is malformed. */
13466 if (current_binding_level->kind != sk_function_parms)
13468 /* Make sure we have already experienced errors. */
13469 gcc_assert (errorcount);
13471 /* Throw away the broken statement tree and extra binding
13473 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13475 while (current_binding_level->kind != sk_function_parms)
13477 if (current_binding_level->kind == sk_class)
13478 pop_nested_class ();
13480 poplevel (0, 0, 0);
13483 poplevel (1, 0, 1);
13485 /* Statements should always be full-expressions at the outermost set
13486 of curly braces for a function. */
13487 gcc_assert (stmts_are_full_exprs_p ());
13489 /* If there are no return statements in a function with auto return type,
13490 the return type is void. But if the declared type is something like
13491 auto*, this is an error. */
13492 if (!processing_template_decl && FNDECL_USED_AUTO (fndecl)
13493 && TREE_TYPE (fntype) == current_function_auto_return_pattern)
13495 if (!is_auto (current_function_auto_return_pattern)
13496 && !current_function_returns_value && !current_function_returns_null)
13498 error ("no return statements in function returning %qT",
13499 current_function_auto_return_pattern);
13500 inform (input_location, "only plain %<auto%> return type can be "
13501 "deduced to %<void%>");
13503 apply_deduced_return_type (fndecl, void_type_node);
13504 fntype = TREE_TYPE (fndecl);
13507 /* Save constexpr function body before it gets munged by
13508 the NRV transformation. */
13509 maybe_save_function_definition (fndecl);
13511 /* Set up the named return value optimization, if we can. Candidate
13512 variables are selected in check_return_expr. */
13513 if (current_function_return_value)
13515 tree r = current_function_return_value;
13518 if (r != error_mark_node
13519 /* This is only worth doing for fns that return in memory--and
13520 simpler, since we don't have to worry about promoted modes. */
13521 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13522 /* Only allow this for variables declared in the outer scope of
13523 the function so we know that their lifetime always ends with a
13524 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13525 we were to do this optimization in tree-ssa. */
13526 && (outer = outer_curly_brace_block (fndecl))
13527 && chain_member (r, BLOCK_VARS (outer)))
13528 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13530 current_function_return_value = NULL_TREE;
13533 /* Remember that we were in class scope. */
13534 if (current_class_name)
13535 ctype = current_class_type;
13537 /* Must mark the RESULT_DECL as being in this function. */
13538 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13540 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13541 to the FUNCTION_DECL node itself. */
13542 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13544 /* Save away current state, if appropriate. */
13545 if (!processing_template_decl)
13546 save_function_data (fndecl);
13548 /* Complain if there's just no return statement. */
13549 if (warn_return_type
13550 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13551 && !dependent_type_p (TREE_TYPE (fntype))
13552 && !current_function_returns_value && !current_function_returns_null
13553 /* Don't complain if we abort or throw. */
13554 && !current_function_returns_abnormally
13555 /* Don't complain if we are declared noreturn. */
13556 && !TREE_THIS_VOLATILE (fndecl)
13557 && !DECL_NAME (DECL_RESULT (fndecl))
13558 && !TREE_NO_WARNING (fndecl)
13559 /* Structor return values (if any) are set by the compiler. */
13560 && !DECL_CONSTRUCTOR_P (fndecl)
13561 && !DECL_DESTRUCTOR_P (fndecl)
13562 && targetm.warn_func_return (fndecl))
13564 warning (OPT_Wreturn_type,
13565 "no return statement in function returning non-void");
13566 TREE_NO_WARNING (fndecl) = 1;
13569 /* Store the end of the function, so that we get good line number
13570 info for the epilogue. */
13571 cfun->function_end_locus = input_location;
13573 /* Complain about parameters that are only set, but never otherwise used. */
13574 if (warn_unused_but_set_parameter
13575 && !processing_template_decl
13576 && errorcount == unused_but_set_errorcount
13577 && !DECL_CLONED_FUNCTION_P (fndecl))
13581 for (decl = DECL_ARGUMENTS (fndecl);
13583 decl = DECL_CHAIN (decl))
13584 if (TREE_USED (decl)
13585 && TREE_CODE (decl) == PARM_DECL
13586 && !DECL_READ_P (decl)
13587 && DECL_NAME (decl)
13588 && !DECL_ARTIFICIAL (decl)
13589 && !TREE_NO_WARNING (decl)
13590 && !DECL_IN_SYSTEM_HEADER (decl)
13591 && TREE_TYPE (decl) != error_mark_node
13592 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13593 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13594 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13595 warning (OPT_Wunused_but_set_parameter,
13596 "parameter %q+D set but not used", decl);
13597 unused_but_set_errorcount = errorcount;
13600 /* Complain about locally defined typedefs that are not used in this
13602 maybe_warn_unused_local_typedefs ();
13604 /* Genericize before inlining. */
13605 if (!processing_template_decl)
13607 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13608 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13609 cp_genericize (fndecl);
13610 /* Clear out the bits we don't need. */
13611 f->x_current_class_ptr = NULL;
13612 f->x_current_class_ref = NULL;
13613 f->x_eh_spec_block = NULL;
13614 f->x_in_charge_parm = NULL;
13615 f->x_vtt_parm = NULL;
13616 f->x_return_value = NULL;
13617 f->bindings = NULL;
13618 f->extern_decl_map = NULL;
13620 /* Clear out the bits we don't need. */
13621 local_names = NULL;
13623 /* We're leaving the context of this function, so zap cfun. It's still in
13624 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13626 current_function_decl = NULL;
13628 /* If this is an in-class inline definition, we may have to pop the
13629 bindings for the template parameters that we added in
13630 maybe_begin_member_template_processing when start_function was
13632 if (inclass_inline)
13633 maybe_end_member_template_processing ();
13635 /* Leave the scope of the class. */
13637 pop_nested_class ();
13642 current_function_decl = NULL_TREE;
13644 defer_mark_used_calls = false;
13645 if (deferred_mark_used_calls)
13650 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13652 VEC_free (tree, gc, deferred_mark_used_calls);
13658 /* Create the FUNCTION_DECL for a function definition.
13659 DECLSPECS and DECLARATOR are the parts of the declaration;
13660 they describe the return type and the name of the function,
13661 but twisted together in a fashion that parallels the syntax of C.
13663 This function creates a binding context for the function body
13664 as well as setting up the FUNCTION_DECL in current_function_decl.
13666 Returns a FUNCTION_DECL on success.
13668 If the DECLARATOR is not suitable for a function (it defines a datum
13669 instead), we return 0, which tells yyparse to report a parse error.
13671 May return void_type_node indicating that this method is actually
13672 a friend. See grokfield for more details.
13674 Came here with a `.pushlevel' .
13676 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13677 CHANGES TO CODE IN `grokfield'. */
13680 grokmethod (cp_decl_specifier_seq *declspecs,
13681 const cp_declarator *declarator, tree attrlist)
13683 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13686 if (fndecl == error_mark_node)
13687 return error_mark_node;
13689 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13691 error ("invalid member function declaration");
13692 return error_mark_node;
13696 cplus_decl_attributes (&fndecl, attrlist, 0);
13698 /* Pass friends other than inline friend functions back. */
13699 if (fndecl == void_type_node)
13702 if (DECL_IN_AGGR_P (fndecl))
13704 if (DECL_CLASS_SCOPE_P (fndecl))
13705 error ("%qD is already defined in class %qT", fndecl,
13706 DECL_CONTEXT (fndecl));
13707 return error_mark_node;
13710 check_template_shadow (fndecl);
13712 DECL_DECLARED_INLINE_P (fndecl) = 1;
13713 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13715 /* We process method specializations in finish_struct_1. */
13716 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13718 fndecl = push_template_decl (fndecl);
13719 if (fndecl == error_mark_node)
13723 if (! DECL_FRIEND_P (fndecl))
13725 if (DECL_CHAIN (fndecl))
13727 fndecl = copy_node (fndecl);
13728 TREE_CHAIN (fndecl) = NULL_TREE;
13732 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13734 DECL_IN_AGGR_P (fndecl) = 1;
13739 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13740 we can lay it out later, when and if its type becomes complete. */
13743 maybe_register_incomplete_var (tree var)
13745 gcc_assert (TREE_CODE (var) == VAR_DECL);
13747 /* Keep track of variables with incomplete types. */
13748 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13749 && DECL_EXTERNAL (var))
13751 tree inner_type = TREE_TYPE (var);
13753 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13754 inner_type = TREE_TYPE (inner_type);
13755 inner_type = TYPE_MAIN_VARIANT (inner_type);
13757 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13758 /* RTTI TD entries are created while defining the type_info. */
13759 || (TYPE_LANG_SPECIFIC (inner_type)
13760 && TYPE_BEING_DEFINED (inner_type)))
13763 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13765 iv->incomplete_type = inner_type;
13770 /* Called when a class type (given by TYPE) is defined. If there are
13771 any existing VAR_DECLs whose type has been completed by this
13772 declaration, update them now. */
13775 complete_vars (tree type)
13778 incomplete_var *iv;
13780 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13782 if (same_type_p (type, iv->incomplete_type))
13784 tree var = iv->decl;
13785 tree type = TREE_TYPE (var);
13786 /* Complete the type of the variable. The VAR_DECL itself
13787 will be laid out in expand_expr. */
13788 complete_type (type);
13789 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13790 /* Remove this entry from the list. */
13791 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13797 /* Check for pending declarations which may have abstract type. */
13798 complete_type_check_abstract (type);
13801 /* If DECL is of a type which needs a cleanup, build and return an
13802 expression to perform that cleanup here. Return NULL_TREE if no
13803 cleanup need be done. */
13806 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13812 /* Assume no cleanup is required. */
13813 cleanup = NULL_TREE;
13815 if (error_operand_p (decl))
13818 /* Handle "__attribute__((cleanup))". We run the cleanup function
13819 before the destructor since the destructor is what actually
13820 terminates the lifetime of the object. */
13821 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13828 /* Get the name specified by the user for the cleanup function. */
13829 id = TREE_VALUE (TREE_VALUE (attr));
13830 /* Look up the name to find the cleanup function to call. It is
13831 important to use lookup_name here because that is what is
13832 used in c-common.c:handle_cleanup_attribute when performing
13833 initial checks on the attribute. Note that those checks
13834 include ensuring that the function found is not an overloaded
13835 function, or an object with an overloaded call operator,
13836 etc.; we can rely on the fact that the function found is an
13837 ordinary FUNCTION_DECL. */
13838 fn = lookup_name (id);
13839 arg = build_address (decl);
13841 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13842 if (cleanup == error_mark_node)
13843 return error_mark_node;
13845 /* Handle ordinary C++ destructors. */
13846 type = TREE_TYPE (decl);
13847 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13849 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13850 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13851 && CLASSTYPE_VBASECLASSES (type));
13855 if (TREE_CODE (type) == ARRAY_TYPE)
13858 addr = build_address (decl);
13860 /* Optimize for space over speed here. */
13861 if (!has_vbases || flag_expensive_optimizations)
13862 flags |= LOOKUP_NONVIRTUAL;
13864 call = build_delete (TREE_TYPE (addr), addr,
13865 sfk_complete_destructor, flags, 0, complain);
13866 if (call == error_mark_node)
13867 cleanup = error_mark_node;
13869 cleanup = cp_build_compound_expr (cleanup, call, complain);
13874 /* build_delete sets the location of the destructor call to the
13875 current location, even though the destructor is going to be
13876 called later, at the end of the current scope. This can lead to
13877 a "jumpy" behaviour for users of debuggers when they step around
13878 the end of the block. So let's unset the location of the
13879 destructor call instead. */
13880 if (cleanup != NULL && EXPR_P (cleanup))
13881 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
13886 /* When a stmt has been parsed, this function is called. */
13893 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13894 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13895 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13898 static_fn_type (tree memfntype)
13903 if (TYPE_PTRMEMFUNC_P (memfntype))
13904 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13905 if (POINTER_TYPE_P (memfntype)
13906 || TREE_CODE (memfntype) == FUNCTION_DECL)
13907 memfntype = TREE_TYPE (memfntype);
13908 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13910 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13911 args = TYPE_ARG_TYPES (memfntype);
13912 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13913 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13914 fntype = (cp_build_type_attribute_variant
13915 (fntype, TYPE_ATTRIBUTES (memfntype)));
13916 fntype = (build_exception_variant
13917 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13921 /* DECL was originally constructed as a non-static member function,
13922 but turned out to be static. Update it accordingly. */
13925 revert_static_member_fn (tree decl)
13927 tree stype = static_fn_type (decl);
13928 cp_cv_quals quals = type_memfn_quals (stype);
13930 if (quals != TYPE_UNQUALIFIED)
13931 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13933 TREE_TYPE (decl) = stype;
13935 if (DECL_ARGUMENTS (decl))
13936 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13937 DECL_STATIC_FUNCTION_P (decl) = 1;
13940 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13941 one of the language-independent trees. */
13943 enum cp_tree_node_structure_enum
13944 cp_tree_node_structure (union lang_tree_node * t)
13946 switch (TREE_CODE (&t->generic))
13948 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13949 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13950 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13951 case OVERLOAD: return TS_CP_OVERLOAD;
13952 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13953 case PTRMEM_CST: return TS_CP_PTRMEM;
13954 case BASELINK: return TS_CP_BASELINK;
13955 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13956 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13957 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13958 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13959 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13960 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13961 default: return TS_CP_GENERIC;
13965 /* Build the void_list_node (void_type_node having been created). */
13967 build_void_list_node (void)
13969 tree t = build_tree_list (NULL_TREE, void_type_node);
13974 cp_missing_noreturn_ok_p (tree decl)
13976 /* A missing noreturn is ok for the `main' function. */
13977 return DECL_MAIN_P (decl);
13980 /* Return the COMDAT group into which DECL should be placed. */
13983 cxx_comdat_group (tree decl)
13987 /* Virtual tables, construction virtual tables, and virtual table
13988 tables all go in a single COMDAT group, named after the primary
13990 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13991 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13992 /* For all other DECLs, the COMDAT group is the mangled name of the
13993 declaration itself. */
13996 while (DECL_THUNK_P (decl))
13998 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13999 into the same section as the target function. In that case
14000 we must return target's name. */
14001 tree target = THUNK_TARGET (decl);
14002 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
14003 && DECL_SECTION_NAME (target) != NULL
14004 && DECL_ONE_ONLY (target))
14009 name = DECL_ASSEMBLER_NAME (decl);
14015 #include "gt-cp-decl.h"