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"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, VEC(tree,gc) **);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 gcc_assert (DECL_P (newdecl));
957 if (TREE_CODE (newdecl) == FUNCTION_DECL)
959 tree f1 = TREE_TYPE (newdecl);
960 tree f2 = TREE_TYPE (olddecl);
961 tree p1 = TYPE_ARG_TYPES (f1);
962 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 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
993 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
994 && (DECL_BUILT_IN (olddecl)
995 #ifndef NO_IMPLICIT_EXTERN_C
996 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
997 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
1001 types_match = self_promoting_args_p (p1);
1002 if (p1 == void_list_node)
1003 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1005 #ifndef NO_IMPLICIT_EXTERN_C
1006 else if (!prototype_p (f1)
1007 && (DECL_EXTERN_C_P (olddecl)
1008 && DECL_IN_SYSTEM_HEADER (olddecl)
1009 && !DECL_CLASS_SCOPE_P (olddecl))
1010 && (DECL_EXTERN_C_P (newdecl)
1011 && DECL_IN_SYSTEM_HEADER (newdecl)
1012 && !DECL_CLASS_SCOPE_P (newdecl)))
1014 types_match = self_promoting_args_p (p2);
1015 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1021 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1022 || comp_type_attributes (TREE_TYPE (newdecl),
1023 TREE_TYPE (olddecl)) != 0);
1028 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1030 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1031 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1034 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1035 DECL_TEMPLATE_PARMS (olddecl)))
1038 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1039 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1040 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1042 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1043 DECL_TEMPLATE_RESULT (newdecl));
1047 /* Need to check scope for variable declaration (VAR_DECL).
1048 For typedef (TYPE_DECL), scope is ignored. */
1049 if (TREE_CODE (newdecl) == VAR_DECL
1050 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1052 Two declarations for an object with C language linkage
1053 with the same name (ignoring the namespace that qualify
1054 it) that appear in different namespace scopes refer to
1056 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1059 if (TREE_TYPE (newdecl) == error_mark_node)
1060 types_match = TREE_TYPE (olddecl) == error_mark_node;
1061 else if (TREE_TYPE (olddecl) == NULL_TREE)
1062 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1063 else if (TREE_TYPE (newdecl) == NULL_TREE)
1066 types_match = comptypes (TREE_TYPE (newdecl),
1067 TREE_TYPE (olddecl),
1068 COMPARE_REDECLARATION);
1074 /* If NEWDECL is `static' and an `extern' was seen previously,
1075 warn about it. OLDDECL is the previous declaration.
1077 Note that this does not apply to the C++ case of declaring
1078 a variable `extern const' and then later `const'.
1080 Don't complain about built-in functions, since they are beyond
1081 the user's control. */
1084 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1086 if (TREE_CODE (newdecl) == TYPE_DECL
1087 || TREE_CODE (newdecl) == TEMPLATE_DECL
1088 || TREE_CODE (newdecl) == CONST_DECL
1089 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1092 /* Don't get confused by static member functions; that's a different
1094 if (TREE_CODE (newdecl) == FUNCTION_DECL
1095 && DECL_STATIC_FUNCTION_P (newdecl))
1098 /* If the old declaration was `static', or the new one isn't, then
1099 everything is OK. */
1100 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1103 /* It's OK to declare a builtin function as `static'. */
1104 if (TREE_CODE (olddecl) == FUNCTION_DECL
1105 && DECL_ARTIFICIAL (olddecl))
1108 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1109 permerror (input_location, "previous declaration of %q+D", olddecl);
1112 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1113 function templates. If their exception specifications do not
1114 match, issue a diagnostic. */
1117 check_redeclaration_exception_specification (tree new_decl,
1122 tree new_exceptions;
1123 tree old_exceptions;
1125 new_type = TREE_TYPE (new_decl);
1126 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1127 old_type = TREE_TYPE (old_decl);
1128 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1132 If any declaration of a function has an exception-specification,
1133 all declarations, including the definition and an explicit
1134 specialization, of that function shall have an
1135 exception-specification with the same set of type-ids. */
1136 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1137 && ! DECL_IS_BUILTIN (old_decl)
1139 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1141 error ("declaration of %qF has a different exception specifier",
1143 error ("from previous declaration %q+F", old_decl);
1147 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1148 Otherwise issue diagnostics. */
1151 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1153 old_decl = STRIP_TEMPLATE (old_decl);
1154 new_decl = STRIP_TEMPLATE (new_decl);
1155 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1156 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1158 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1159 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1161 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1163 /* Hide a built-in declaration. */
1164 DECL_DECLARED_CONSTEXPR_P (old_decl)
1165 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1168 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1169 error ("from previous declaration %q+D", old_decl);
1173 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1174 && lookup_attribute ("gnu_inline", \
1175 DECL_ATTRIBUTES (fn)))
1177 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1178 If the redeclaration is invalid, a diagnostic is issued, and the
1179 error_mark_node is returned. Otherwise, OLDDECL is returned.
1181 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1184 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1187 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1189 unsigned olddecl_uid = DECL_UID (olddecl);
1190 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1191 int new_defines_function = 0;
1192 tree new_template_info;
1194 if (newdecl == olddecl)
1197 types_match = decls_match (newdecl, olddecl);
1199 /* If either the type of the new decl or the type of the old decl is an
1200 error_mark_node, then that implies that we have already issued an
1201 error (earlier) for some bogus type specification, and in that case,
1202 it is rather pointless to harass the user with yet more error message
1203 about the same declaration, so just pretend the types match here. */
1204 if (TREE_TYPE (newdecl) == error_mark_node
1205 || TREE_TYPE (olddecl) == error_mark_node)
1206 return error_mark_node;
1208 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1209 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1211 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1212 && TREE_CODE (olddecl) != TEMPLATE_DECL
1213 && check_raw_literal_operator (olddecl))
1214 error ("literal operator template %q+D conflicts with"
1215 " raw literal operator %qD", newdecl, olddecl);
1216 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1217 && TREE_CODE (olddecl) == TEMPLATE_DECL
1218 && check_raw_literal_operator (newdecl))
1219 error ("raw literal operator %q+D conflicts with"
1220 " literal operator template %qD", newdecl, olddecl);
1223 if (DECL_P (olddecl)
1224 && TREE_CODE (newdecl) == FUNCTION_DECL
1225 && TREE_CODE (olddecl) == FUNCTION_DECL
1226 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1228 if (DECL_DECLARED_INLINE_P (newdecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1231 /* Already warned elsewhere. */;
1232 else if (DECL_DECLARED_INLINE_P (olddecl)
1233 && DECL_UNINLINABLE (olddecl)
1234 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1235 /* Already warned. */;
1236 else if (DECL_DECLARED_INLINE_P (newdecl)
1237 && DECL_UNINLINABLE (olddecl)
1238 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1240 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1242 warning (OPT_Wattributes, "previous declaration of %q+D "
1243 "with attribute noinline", olddecl);
1245 else if (DECL_DECLARED_INLINE_P (olddecl)
1246 && DECL_UNINLINABLE (newdecl)
1247 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1249 warning (OPT_Wattributes, "function %q+D redeclared with "
1250 "attribute noinline", newdecl);
1251 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1256 /* Check for redeclaration and other discrepancies. */
1257 if (TREE_CODE (olddecl) == FUNCTION_DECL
1258 && DECL_ARTIFICIAL (olddecl))
1260 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1261 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1263 /* Avoid warnings redeclaring built-ins which have not been
1264 explicitly declared. */
1265 if (DECL_ANTICIPATED (olddecl))
1268 /* If you declare a built-in or predefined function name as static,
1269 the old definition is overridden, but optionally warn this was a
1270 bad choice of name. */
1271 if (! TREE_PUBLIC (newdecl))
1273 warning (OPT_Wshadow,
1274 DECL_BUILT_IN (olddecl)
1275 ? G_("shadowing built-in function %q#D")
1276 : G_("shadowing library function %q#D"), olddecl);
1277 /* Discard the old built-in function. */
1280 /* If the built-in is not ansi, then programs can override
1281 it even globally without an error. */
1282 else if (! DECL_BUILT_IN (olddecl))
1283 warning (0, "library function %q#D redeclared as non-function %q#D",
1287 error ("declaration of %q#D", newdecl);
1288 error ("conflicts with built-in declaration %q#D",
1293 else if (!types_match)
1295 /* Avoid warnings redeclaring built-ins which have not been
1296 explicitly declared. */
1297 if (DECL_ANTICIPATED (olddecl))
1299 /* Deal with fileptr_type_node. FILE type is not known
1300 at the time we create the builtins. */
1303 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1304 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1306 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1309 else if (TREE_VALUE (t2) == fileptr_type_node)
1311 tree t = TREE_VALUE (t1);
1313 if (TREE_CODE (t) == POINTER_TYPE
1314 && TYPE_NAME (TREE_TYPE (t))
1315 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1316 == get_identifier ("FILE")
1317 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1319 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1321 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1322 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1323 types_match = decls_match (newdecl, olddecl);
1325 return duplicate_decls (newdecl, olddecl,
1327 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1330 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1333 else if ((DECL_EXTERN_C_P (newdecl)
1334 && DECL_EXTERN_C_P (olddecl))
1335 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1336 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1338 /* A near match; override the builtin. */
1340 if (TREE_PUBLIC (newdecl))
1342 warning (0, "new declaration %q#D", newdecl);
1343 warning (0, "ambiguates built-in declaration %q#D",
1347 warning (OPT_Wshadow,
1348 DECL_BUILT_IN (olddecl)
1349 ? G_("shadowing built-in function %q#D")
1350 : G_("shadowing library function %q#D"), olddecl);
1353 /* Discard the old built-in function. */
1356 /* Replace the old RTL to avoid problems with inlining. */
1357 COPY_DECL_RTL (newdecl, olddecl);
1359 /* Even if the types match, prefer the new declarations type for
1360 built-ins which have not been explicitly declared, for
1361 exception lists, etc... */
1362 else if (DECL_IS_BUILTIN (olddecl))
1364 tree type = TREE_TYPE (newdecl);
1365 tree attribs = (*targetm.merge_type_attributes)
1366 (TREE_TYPE (olddecl), type);
1368 type = cp_build_type_attribute_variant (type, attribs);
1369 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1372 /* If a function is explicitly declared "throw ()", propagate that to
1373 the corresponding builtin. */
1374 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1375 && DECL_ANTICIPATED (olddecl)
1376 && TREE_NOTHROW (newdecl)
1377 && !TREE_NOTHROW (olddecl))
1379 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1380 tree tmpdecl = builtin_decl_explicit (fncode);
1381 if (tmpdecl && tmpdecl != olddecl && types_match)
1382 TREE_NOTHROW (tmpdecl) = 1;
1385 /* Whether or not the builtin can throw exceptions has no
1386 bearing on this declarator. */
1387 TREE_NOTHROW (olddecl) = 0;
1389 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1391 /* If a builtin function is redeclared as `static', merge
1392 the declarations, but make the original one static. */
1393 DECL_THIS_STATIC (olddecl) = 1;
1394 TREE_PUBLIC (olddecl) = 0;
1396 /* Make the old declaration consistent with the new one so
1397 that all remnants of the builtin-ness of this function
1398 will be banished. */
1399 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1400 COPY_DECL_RTL (newdecl, olddecl);
1403 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1405 /* C++ Standard, 3.3, clause 4:
1406 "[Note: a namespace name or a class template name must be unique
1407 in its declarative region (7.3.2, clause 14). ]" */
1408 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1409 && TREE_CODE (newdecl) != NAMESPACE_DECL
1410 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1412 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1413 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1415 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1416 && TREE_CODE (newdecl) != TYPE_DECL)
1417 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1418 && TREE_CODE (olddecl) != TYPE_DECL))
1420 /* We do nothing special here, because C++ does such nasty
1421 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1422 get shadowed, and know that if we need to find a TYPE_DECL
1423 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1424 slot of the identifier. */
1428 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1430 || (TREE_CODE (olddecl) == FUNCTION_DECL
1431 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1435 error ("%q#D redeclared as different kind of symbol", newdecl);
1436 if (TREE_CODE (olddecl) == TREE_LIST)
1437 olddecl = TREE_VALUE (olddecl);
1438 error ("previous declaration of %q+#D", olddecl);
1440 return error_mark_node;
1442 else if (!types_match)
1444 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1445 /* These are certainly not duplicate declarations; they're
1446 from different scopes. */
1449 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1451 /* The name of a class template may not be declared to refer to
1452 any other template, class, function, object, namespace, value,
1453 or type in the same scope. */
1454 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1455 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1457 error ("declaration of template %q#D", newdecl);
1458 error ("conflicts with previous declaration %q+#D", olddecl);
1460 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1461 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1462 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1463 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1464 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1465 DECL_TEMPLATE_PARMS (olddecl))
1466 /* Template functions can be disambiguated by
1468 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1469 TREE_TYPE (TREE_TYPE (olddecl))))
1471 error ("new declaration %q#D", newdecl);
1472 error ("ambiguates old declaration %q+#D", olddecl);
1476 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1478 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1480 error ("declaration of C function %q#D conflicts with",
1482 error ("previous declaration %q+#D here", olddecl);
1485 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1486 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1488 error ("new declaration %q#D", newdecl);
1489 error ("ambiguates old declaration %q+#D", olddecl);
1490 return error_mark_node;
1497 error ("conflicting declaration %q#D", newdecl);
1498 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1499 return error_mark_node;
1502 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1503 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1504 && (!DECL_TEMPLATE_INFO (newdecl)
1505 || (DECL_TI_TEMPLATE (newdecl)
1506 != DECL_TI_TEMPLATE (olddecl))))
1507 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1508 && (!DECL_TEMPLATE_INFO (olddecl)
1509 || (DECL_TI_TEMPLATE (olddecl)
1510 != DECL_TI_TEMPLATE (newdecl))))))
1511 /* It's OK to have a template specialization and a non-template
1512 with the same type, or to have specializations of two
1513 different templates with the same type. Note that if one is a
1514 specialization, and the other is an instantiation of the same
1515 template, that we do not exit at this point. That situation
1516 can occur if we instantiate a template class, and then
1517 specialize one of its methods. This situation is valid, but
1518 the declarations must be merged in the usual way. */
1520 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1521 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1522 && !DECL_USE_TEMPLATE (newdecl))
1523 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1524 && !DECL_USE_TEMPLATE (olddecl))))
1525 /* One of the declarations is a template instantiation, and the
1526 other is not a template at all. That's OK. */
1528 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1530 /* In [namespace.alias] we have:
1532 In a declarative region, a namespace-alias-definition can be
1533 used to redefine a namespace-alias declared in that declarative
1534 region to refer only to the namespace to which it already
1537 Therefore, if we encounter a second alias directive for the same
1538 alias, we can just ignore the second directive. */
1539 if (DECL_NAMESPACE_ALIAS (newdecl)
1540 && (DECL_NAMESPACE_ALIAS (newdecl)
1541 == DECL_NAMESPACE_ALIAS (olddecl)))
1543 /* [namespace.alias]
1545 A namespace-name or namespace-alias shall not be declared as
1546 the name of any other entity in the same declarative region.
1547 A namespace-name defined at global scope shall not be
1548 declared as the name of any other entity in any global scope
1550 error ("declaration of namespace %qD conflicts with", newdecl);
1551 error ("previous declaration of namespace %q+D here", olddecl);
1552 return error_mark_node;
1556 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1559 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1560 if (DECL_NAME (olddecl) != NULL_TREE)
1561 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1562 ? G_("%q+#D previously defined here")
1563 : G_("%q+#D previously declared here"), olddecl);
1564 return error_mark_node;
1566 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1567 && DECL_INITIAL (olddecl) != NULL_TREE
1568 && !prototype_p (TREE_TYPE (olddecl))
1569 && prototype_p (TREE_TYPE (newdecl)))
1571 /* Prototype decl follows defn w/o prototype. */
1572 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1573 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1574 "follows non-prototype definition here");
1576 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1577 || TREE_CODE (olddecl) == VAR_DECL)
1578 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1581 If two declarations of the same function or object
1582 specify different linkage-specifications ..., the program
1583 is ill-formed.... Except for functions with C++ linkage,
1584 a function declaration without a linkage specification
1585 shall not precede the first linkage specification for
1586 that function. A function can be declared without a
1587 linkage specification after an explicit linkage
1588 specification has been seen; the linkage explicitly
1589 specified in the earlier declaration is not affected by
1590 such a function declaration.
1592 DR 563 raises the question why the restrictions on
1593 functions should not also apply to objects. Older
1594 versions of G++ silently ignore the linkage-specification
1602 which is clearly wrong. Therefore, we now treat objects
1604 if (current_lang_depth () == 0)
1606 /* There is no explicit linkage-specification, so we use
1607 the linkage from the previous declaration. */
1608 if (!DECL_LANG_SPECIFIC (newdecl))
1609 retrofit_lang_decl (newdecl);
1610 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1614 error ("previous declaration of %q+#D with %qL linkage",
1615 olddecl, DECL_LANGUAGE (olddecl));
1616 error ("conflicts with new declaration with %qL linkage",
1617 DECL_LANGUAGE (newdecl));
1621 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1623 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1625 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1626 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1629 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1630 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1632 for (; t1 && t1 != void_list_node;
1633 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1634 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1636 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1639 permerror (input_location, "default argument given for parameter %d of %q#D",
1641 permerror (input_location, "after previous specification in %q+#D", olddecl);
1645 error ("default argument given for parameter %d of %q#D",
1647 error ("after previous specification in %q+#D",
1654 /* Do not merge an implicit typedef with an explicit one. In:
1658 typedef class A A __attribute__ ((foo));
1660 the attribute should apply only to the typedef. */
1661 if (TREE_CODE (olddecl) == TYPE_DECL
1662 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1663 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1666 /* If new decl is `static' and an `extern' was seen previously,
1668 warn_extern_redeclared_static (newdecl, olddecl);
1670 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1671 return error_mark_node;
1673 /* We have committed to returning 1 at this point. */
1674 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1676 /* Now that functions must hold information normally held
1677 by field decls, there is extra work to do so that
1678 declaration information does not get destroyed during
1680 if (DECL_VINDEX (olddecl))
1681 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1682 if (DECL_CONTEXT (olddecl))
1683 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1684 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1685 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1686 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1687 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1688 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1689 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1690 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1691 SET_OVERLOADED_OPERATOR_CODE
1692 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1693 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1695 /* Optionally warn about more than one declaration for the same
1696 name, but don't warn about a function declaration followed by a
1698 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1699 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1700 /* Don't warn about extern decl followed by definition. */
1701 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1702 /* Don't warn about friends, let add_friend take care of it. */
1703 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl))
1704 /* Don't warn about declaration followed by specialization. */
1705 && (! DECL_TEMPLATE_SPECIALIZATION (newdecl)
1706 || DECL_TEMPLATE_SPECIALIZATION (olddecl)))
1708 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1709 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1712 if (DECL_DELETED_FN (newdecl))
1714 error ("deleted definition of %qD", newdecl);
1715 error ("after previous declaration %q+D", olddecl);
1717 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1720 /* Deal with C++: must preserve virtual function table size. */
1721 if (TREE_CODE (olddecl) == TYPE_DECL)
1723 tree newtype = TREE_TYPE (newdecl);
1724 tree oldtype = TREE_TYPE (olddecl);
1726 if (newtype != error_mark_node && oldtype != error_mark_node
1727 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1728 CLASSTYPE_FRIEND_CLASSES (newtype)
1729 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1731 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1734 /* Copy all the DECL_... slots specified in the new decl
1735 except for any that we copy here from the old type. */
1736 DECL_ATTRIBUTES (newdecl)
1737 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1739 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1743 old_result = DECL_TEMPLATE_RESULT (olddecl);
1744 new_result = DECL_TEMPLATE_RESULT (newdecl);
1745 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1746 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1747 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1748 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1750 DECL_ATTRIBUTES (old_result)
1751 = (*targetm.merge_decl_attributes) (old_result, new_result);
1753 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1755 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1756 && DECL_INITIAL (new_result))
1758 if (DECL_INITIAL (old_result))
1759 DECL_UNINLINABLE (old_result) = 1;
1761 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1762 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1763 DECL_NOT_REALLY_EXTERN (old_result)
1764 = DECL_NOT_REALLY_EXTERN (new_result);
1765 DECL_INTERFACE_KNOWN (old_result)
1766 = DECL_INTERFACE_KNOWN (new_result);
1767 DECL_DECLARED_INLINE_P (old_result)
1768 = DECL_DECLARED_INLINE_P (new_result);
1769 DECL_DISREGARD_INLINE_LIMITS (old_result)
1770 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1775 DECL_DECLARED_INLINE_P (old_result)
1776 |= DECL_DECLARED_INLINE_P (new_result);
1777 DECL_DISREGARD_INLINE_LIMITS (old_result)
1778 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1779 check_redeclaration_exception_specification (newdecl, olddecl);
1783 /* If the new declaration is a definition, update the file and
1784 line information on the declaration, and also make
1785 the old declaration the same definition. */
1786 if (DECL_INITIAL (new_result) != NULL_TREE)
1788 DECL_SOURCE_LOCATION (olddecl)
1789 = DECL_SOURCE_LOCATION (old_result)
1790 = DECL_SOURCE_LOCATION (newdecl);
1791 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1792 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1795 DECL_ARGUMENTS (old_result)
1796 = DECL_ARGUMENTS (new_result);
1797 for (parm = DECL_ARGUMENTS (old_result); parm;
1798 parm = DECL_CHAIN (parm))
1799 DECL_CONTEXT (parm) = old_result;
1808 /* Automatically handles default parameters. */
1809 tree oldtype = TREE_TYPE (olddecl);
1812 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1813 maybe_instantiate_noexcept (olddecl);
1815 /* Merge the data types specified in the two decls. */
1816 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1818 /* If merge_types produces a non-typedef type, just use the old type. */
1819 if (TREE_CODE (newdecl) == TYPE_DECL
1820 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1823 if (TREE_CODE (newdecl) == VAR_DECL)
1825 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1826 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1827 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1828 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1829 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1830 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1832 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1833 if (DECL_LANG_SPECIFIC (olddecl)
1834 && CP_DECL_THREADPRIVATE_P (olddecl))
1836 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1837 if (!DECL_LANG_SPECIFIC (newdecl))
1838 retrofit_lang_decl (newdecl);
1840 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1841 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1845 /* Do this after calling `merge_types' so that default
1846 parameters don't confuse us. */
1847 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1848 check_redeclaration_exception_specification (newdecl, olddecl);
1849 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1851 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1852 check_default_args (newdecl);
1854 /* Lay the type out, unless already done. */
1855 if (! same_type_p (newtype, oldtype)
1856 && TREE_TYPE (newdecl) != error_mark_node
1857 && !(processing_template_decl && uses_template_parms (newdecl)))
1858 layout_type (TREE_TYPE (newdecl));
1860 if ((TREE_CODE (newdecl) == VAR_DECL
1861 || TREE_CODE (newdecl) == PARM_DECL
1862 || TREE_CODE (newdecl) == RESULT_DECL
1863 || TREE_CODE (newdecl) == FIELD_DECL
1864 || TREE_CODE (newdecl) == TYPE_DECL)
1865 && !(processing_template_decl && uses_template_parms (newdecl)))
1866 layout_decl (newdecl, 0);
1868 /* Merge the type qualifiers. */
1869 if (TREE_READONLY (newdecl))
1870 TREE_READONLY (olddecl) = 1;
1871 if (TREE_THIS_VOLATILE (newdecl))
1872 TREE_THIS_VOLATILE (olddecl) = 1;
1873 if (TREE_NOTHROW (newdecl))
1874 TREE_NOTHROW (olddecl) = 1;
1876 /* Merge deprecatedness. */
1877 if (TREE_DEPRECATED (newdecl))
1878 TREE_DEPRECATED (olddecl) = 1;
1880 /* Preserve function specific target and optimization options */
1881 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1883 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1885 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1888 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1889 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1890 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1891 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1894 /* Merge the initialization information. */
1895 if (DECL_INITIAL (newdecl) == NULL_TREE
1896 && DECL_INITIAL (olddecl) != NULL_TREE)
1898 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1899 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1900 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1902 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1903 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1907 /* Merge the section attribute.
1908 We want to issue an error if the sections conflict but that must be
1909 done later in decl_attributes since we are called before attributes
1911 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1912 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1914 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1916 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1917 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1918 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1919 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1920 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1921 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1922 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1923 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1924 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1925 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1926 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1927 /* Keep the old RTL. */
1928 COPY_DECL_RTL (olddecl, newdecl);
1930 else if (TREE_CODE (newdecl) == VAR_DECL
1931 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1933 /* Keep the old RTL. We cannot keep the old RTL if the old
1934 declaration was for an incomplete object and the new
1935 declaration is not since many attributes of the RTL will
1937 COPY_DECL_RTL (olddecl, newdecl);
1940 /* If cannot merge, then use the new type and qualifiers,
1941 and don't preserve the old rtl. */
1944 /* Clean out any memory we had of the old declaration. */
1945 tree oldstatic = value_member (olddecl, static_aggregates);
1947 TREE_VALUE (oldstatic) = error_mark_node;
1949 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1950 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1951 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1952 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1955 /* Merge the storage class information. */
1956 merge_weak (newdecl, olddecl);
1958 if (DECL_ONE_ONLY (olddecl))
1959 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1961 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1962 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1963 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1964 if (! DECL_EXTERNAL (olddecl))
1965 DECL_EXTERNAL (newdecl) = 0;
1967 new_template_info = NULL_TREE;
1968 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1970 bool new_redefines_gnu_inline = false;
1972 if (new_defines_function
1973 && ((DECL_INTERFACE_KNOWN (olddecl)
1974 && TREE_CODE (olddecl) == FUNCTION_DECL)
1975 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1976 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1977 == FUNCTION_DECL))))
1981 if (TREE_CODE (fn) == TEMPLATE_DECL)
1982 fn = DECL_TEMPLATE_RESULT (olddecl);
1984 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1987 if (!new_redefines_gnu_inline)
1989 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1990 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1991 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1993 DECL_TEMPLATE_INSTANTIATED (newdecl)
1994 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1995 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1997 /* If the OLDDECL is an instantiation and/or specialization,
1998 then the NEWDECL must be too. But, it may not yet be marked
1999 as such if the caller has created NEWDECL, but has not yet
2000 figured out that it is a redeclaration. */
2001 if (!DECL_USE_TEMPLATE (newdecl))
2002 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
2004 /* Don't really know how much of the language-specific
2005 values we should copy from old to new. */
2006 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2007 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2008 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2009 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2011 if (LANG_DECL_HAS_MIN (newdecl))
2013 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2014 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2015 if (DECL_TEMPLATE_INFO (newdecl))
2016 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2017 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2019 /* Only functions have these fields. */
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL
2021 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2023 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2024 olddecl_friend = DECL_FRIEND_P (olddecl);
2025 hidden_friend = (DECL_ANTICIPATED (olddecl)
2026 && DECL_HIDDEN_FRIEND_P (olddecl)
2027 && newdecl_is_friend);
2028 DECL_BEFRIENDING_CLASSES (newdecl)
2029 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2030 DECL_BEFRIENDING_CLASSES (olddecl));
2031 /* DECL_THUNKS is only valid for virtual functions,
2032 otherwise it is a DECL_FRIEND_CONTEXT. */
2033 if (DECL_VIRTUAL_P (newdecl))
2034 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2036 /* Only variables have this field. */
2037 else if (TREE_CODE (newdecl) == VAR_DECL
2038 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2039 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2042 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2046 /* Merge parameter attributes. */
2047 tree oldarg, newarg;
2048 for (oldarg = DECL_ARGUMENTS(olddecl),
2049 newarg = DECL_ARGUMENTS(newdecl);
2051 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2052 DECL_ATTRIBUTES (newarg)
2053 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2054 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2057 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2058 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2060 /* If newdecl is not a specialization, then it is not a
2061 template-related function at all. And that means that we
2062 should have exited above, returning 0. */
2063 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2065 if (DECL_ODR_USED (olddecl))
2066 /* From [temp.expl.spec]:
2068 If a template, a member template or the member of a class
2069 template is explicitly specialized then that
2070 specialization shall be declared before the first use of
2071 that specialization that would cause an implicit
2072 instantiation to take place, in every translation unit in
2073 which such a use occurs. */
2074 error ("explicit specialization of %qD after first use",
2077 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2079 /* Don't propagate visibility from the template to the
2080 specialization here. We'll do that in determine_visibility if
2082 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2084 /* [temp.expl.spec/14] We don't inline explicit specialization
2085 just because the primary template says so. */
2087 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2088 the always_inline attribute. */
2089 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2090 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2092 if (DECL_DECLARED_INLINE_P (newdecl))
2093 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2095 DECL_ATTRIBUTES (newdecl)
2096 = remove_attribute ("always_inline",
2097 DECL_ATTRIBUTES (newdecl));
2100 else if (new_defines_function && DECL_INITIAL (olddecl))
2102 /* Never inline re-defined extern inline functions.
2103 FIXME: this could be better handled by keeping both
2104 function as separate declarations. */
2105 DECL_UNINLINABLE (newdecl) = 1;
2109 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2110 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2112 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2114 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2115 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2117 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2118 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2119 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2120 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2123 /* Preserve abstractness on cloned [cd]tors. */
2124 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2126 /* Update newdecl's parms to point at olddecl. */
2127 for (parm = DECL_ARGUMENTS (newdecl); parm;
2128 parm = DECL_CHAIN (parm))
2129 DECL_CONTEXT (parm) = olddecl;
2133 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2134 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2135 COPY_DECL_RTL (newdecl, olddecl);
2137 if (! types_match || new_defines_function)
2139 /* These need to be copied so that the names are available.
2140 Note that if the types do match, we'll preserve inline
2141 info and other bits, but if not, we won't. */
2142 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2143 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2145 if (new_defines_function)
2146 /* If defining a function declared with other language
2147 linkage, use the previously declared language linkage. */
2148 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2149 else if (types_match)
2151 /* If redeclaring a builtin function, and not a definition,
2152 it stays built in. */
2153 if (DECL_BUILT_IN (olddecl))
2155 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2156 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2157 /* If we're keeping the built-in definition, keep the rtl,
2158 regardless of declaration matches. */
2159 COPY_DECL_RTL (olddecl, newdecl);
2160 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2162 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2165 /* If a compatible prototype of these builtin functions
2166 is seen, assume the runtime implements it with the
2167 expected semantics. */
2168 case BUILT_IN_STPCPY:
2169 if (builtin_decl_explicit_p (fncode))
2170 set_builtin_decl_implicit_p (fncode, true);
2178 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2179 /* Don't clear out the arguments if we're just redeclaring a
2181 if (DECL_ARGUMENTS (olddecl))
2182 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2185 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2186 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2188 /* Now preserve various other info from the definition. */
2189 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2190 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2191 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2192 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2194 /* Warn about conflicting visibility specifications. */
2195 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2196 && DECL_VISIBILITY_SPECIFIED (newdecl)
2197 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2199 warning_at (input_location, OPT_Wattributes,
2200 "%q+D: visibility attribute ignored because it", newdecl);
2201 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2202 "conflicts with previous declaration here");
2204 /* Choose the declaration which specified visibility. */
2205 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2207 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2208 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2210 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2211 so keep this behavior. */
2212 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2214 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2215 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2217 /* Likewise for DECL_ALIGN, DECL_USER_ALIGN and DECL_PACKED. */
2218 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
2220 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
2221 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
2223 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2224 if (TREE_CODE (newdecl) == FIELD_DECL)
2225 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2227 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2228 with that from NEWDECL below. */
2229 if (DECL_LANG_SPECIFIC (olddecl))
2231 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2232 != DECL_LANG_SPECIFIC (newdecl));
2233 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2236 /* Merge the USED information. */
2237 if (TREE_USED (olddecl))
2238 TREE_USED (newdecl) = 1;
2239 else if (TREE_USED (newdecl))
2240 TREE_USED (olddecl) = 1;
2241 if (TREE_CODE (newdecl) == VAR_DECL)
2243 if (DECL_READ_P (olddecl))
2244 DECL_READ_P (newdecl) = 1;
2245 else if (DECL_READ_P (newdecl))
2246 DECL_READ_P (olddecl) = 1;
2248 if (DECL_PRESERVE_P (olddecl))
2249 DECL_PRESERVE_P (newdecl) = 1;
2250 else if (DECL_PRESERVE_P (newdecl))
2251 DECL_PRESERVE_P (olddecl) = 1;
2253 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2257 function_size = sizeof (struct tree_decl_common);
2259 memcpy ((char *) olddecl + sizeof (struct tree_common),
2260 (char *) newdecl + sizeof (struct tree_common),
2261 function_size - sizeof (struct tree_common));
2263 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2264 (char *) newdecl + sizeof (struct tree_decl_common),
2265 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2266 if (new_template_info)
2267 /* If newdecl is a template instantiation, it is possible that
2268 the following sequence of events has occurred:
2270 o A friend function was declared in a class template. The
2271 class template was instantiated.
2273 o The instantiation of the friend declaration was
2274 recorded on the instantiation list, and is newdecl.
2276 o Later, however, instantiate_class_template called pushdecl
2277 on the newdecl to perform name injection. But, pushdecl in
2278 turn called duplicate_decls when it discovered that another
2279 declaration of a global function with the same name already
2282 o Here, in duplicate_decls, we decided to clobber newdecl.
2284 If we're going to do that, we'd better make sure that
2285 olddecl, and not newdecl, is on the list of
2286 instantiations so that if we try to do the instantiation
2287 again we won't get the clobbered declaration. */
2288 reregister_specialization (newdecl,
2294 size_t size = tree_code_size (TREE_CODE (olddecl));
2295 memcpy ((char *) olddecl + sizeof (struct tree_common),
2296 (char *) newdecl + sizeof (struct tree_common),
2297 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2298 switch (TREE_CODE (olddecl))
2308 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2309 (char *) newdecl + sizeof (struct tree_decl_common),
2310 size - sizeof (struct tree_decl_common)
2311 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2315 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2316 (char *) newdecl + sizeof (struct tree_decl_common),
2317 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2318 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2322 DECL_UID (olddecl) = olddecl_uid;
2324 DECL_FRIEND_P (olddecl) = 1;
2327 DECL_ANTICIPATED (olddecl) = 1;
2328 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2331 /* NEWDECL contains the merged attribute lists.
2332 Update OLDDECL to be the same. */
2333 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2335 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2336 so that encode_section_info has a chance to look at the new decl
2337 flags and attributes. */
2338 if (DECL_RTL_SET_P (olddecl)
2339 && (TREE_CODE (olddecl) == FUNCTION_DECL
2340 || (TREE_CODE (olddecl) == VAR_DECL
2341 && TREE_STATIC (olddecl))))
2342 make_decl_rtl (olddecl);
2344 /* The NEWDECL will no longer be needed. Because every out-of-class
2345 declaration of a member results in a call to duplicate_decls,
2346 freeing these nodes represents in a significant savings. */
2352 /* Return zero if the declaration NEWDECL is valid
2353 when the declaration OLDDECL (assumed to be for the same name)
2354 has already been seen.
2355 Otherwise return an error message format string with a %s
2356 where the identifier should go. */
2359 redeclaration_error_message (tree newdecl, tree olddecl)
2361 if (TREE_CODE (newdecl) == TYPE_DECL)
2363 /* Because C++ can put things into name space for free,
2364 constructs like "typedef struct foo { ... } foo"
2365 would look like an erroneous redeclaration. */
2366 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2369 return G_("redefinition of %q#D");
2371 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2373 /* If this is a pure function, its olddecl will actually be
2374 the original initialization to `0' (which we force to call
2375 abort()). Don't complain about redefinition in this case. */
2376 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2377 && DECL_INITIAL (olddecl) == NULL_TREE)
2380 /* If both functions come from different namespaces, this is not
2381 a redeclaration - this is a conflict with a used function. */
2382 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2383 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2384 && ! decls_match (olddecl, newdecl))
2385 return G_("%qD conflicts with used function");
2387 /* We'll complain about linkage mismatches in
2388 warn_extern_redeclared_static. */
2390 /* Defining the same name twice is no good. */
2391 if (DECL_INITIAL (olddecl) != NULL_TREE
2392 && DECL_INITIAL (newdecl) != NULL_TREE)
2394 if (DECL_NAME (olddecl) == NULL_TREE)
2395 return G_("%q#D not declared in class");
2396 else if (!GNU_INLINE_P (olddecl)
2397 || GNU_INLINE_P (newdecl))
2398 return G_("redefinition of %q#D");
2401 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2403 bool olda = GNU_INLINE_P (olddecl);
2404 bool newa = GNU_INLINE_P (newdecl);
2409 return G_("%q+D redeclared inline with "
2410 "%<gnu_inline%> attribute");
2412 return G_("%q+D redeclared inline without "
2413 "%<gnu_inline%> attribute");
2419 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2423 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2425 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2426 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2427 return G_("redefinition of %q#D");
2431 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2432 || (DECL_TEMPLATE_RESULT (newdecl)
2433 == DECL_TEMPLATE_RESULT (olddecl)))
2436 nt = DECL_TEMPLATE_RESULT (newdecl);
2437 if (DECL_TEMPLATE_INFO (nt))
2438 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2439 ot = DECL_TEMPLATE_RESULT (olddecl);
2440 if (DECL_TEMPLATE_INFO (ot))
2441 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2442 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2443 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2444 return G_("redefinition of %q#D");
2446 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2448 bool olda = GNU_INLINE_P (ot);
2449 bool newa = GNU_INLINE_P (nt);
2454 return G_("%q+D redeclared inline with "
2455 "%<gnu_inline%> attribute");
2457 return G_("%q+D redeclared inline without "
2458 "%<gnu_inline%> attribute");
2462 /* Core issue #226 (C++0x):
2464 If a friend function template declaration specifies a
2465 default template-argument, that declaration shall be a
2466 definition and shall be the only declaration of the
2467 function template in the translation unit. */
2468 if ((cxx_dialect != cxx98)
2469 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2470 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2471 /*is_primary=*/1, /*is_partial=*/0,
2472 /*is_friend_decl=*/2))
2473 return G_("redeclaration of friend %q#D "
2474 "may not have default template arguments");
2478 else if (TREE_CODE (newdecl) == VAR_DECL
2479 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2480 && (! DECL_LANG_SPECIFIC (olddecl)
2481 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2482 || DECL_THREAD_LOCAL_P (newdecl)))
2484 /* Only variables can be thread-local, and all declarations must
2485 agree on this property. */
2486 if (DECL_THREAD_LOCAL_P (newdecl))
2487 return G_("thread-local declaration of %q#D follows "
2488 "non-thread-local declaration");
2490 return G_("non-thread-local declaration of %q#D follows "
2491 "thread-local declaration");
2493 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2495 /* The objects have been declared at namespace scope. If either
2496 is a member of an anonymous union, then this is an invalid
2497 redeclaration. For example:
2503 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2504 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2505 return G_("redeclaration of %q#D");
2506 /* If at least one declaration is a reference, there is no
2507 conflict. For example:
2513 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2515 /* Reject two definitions. */
2516 return G_("redefinition of %q#D");
2520 /* Objects declared with block scope: */
2521 /* Reject two definitions, and reject a definition
2522 together with an external reference. */
2523 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2524 return G_("redeclaration of %q#D");
2529 /* Hash and equality functions for the named_label table. */
2532 named_label_entry_hash (const void *data)
2534 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2535 return DECL_UID (ent->label_decl);
2539 named_label_entry_eq (const void *a, const void *b)
2541 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2542 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2543 return ent_a->label_decl == ent_b->label_decl;
2546 /* Create a new label, named ID. */
2549 make_label_decl (tree id, int local_p)
2551 struct named_label_entry *ent;
2555 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2557 DECL_CONTEXT (decl) = current_function_decl;
2558 DECL_MODE (decl) = VOIDmode;
2559 C_DECLARED_LABEL_FLAG (decl) = local_p;
2561 /* Say where one reference is to the label, for the sake of the
2562 error if it is not defined. */
2563 DECL_SOURCE_LOCATION (decl) = input_location;
2565 /* Record the fact that this identifier is bound to this label. */
2566 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2568 /* Create the label htab for the function on demand. */
2570 named_labels = htab_create_ggc (13, named_label_entry_hash,
2571 named_label_entry_eq, NULL);
2573 /* Record this label on the list of labels used in this function.
2574 We do this before calling make_label_decl so that we get the
2575 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2576 ent = ggc_alloc_cleared_named_label_entry ();
2577 ent->label_decl = decl;
2579 slot = htab_find_slot (named_labels, ent, INSERT);
2580 gcc_assert (*slot == NULL);
2586 /* Look for a label named ID in the current function. If one cannot
2587 be found, create one. (We keep track of used, but undefined,
2588 labels, and complain about them at the end of a function.) */
2591 lookup_label_1 (tree id)
2595 /* You can't use labels at global scope. */
2596 if (current_function_decl == NULL_TREE)
2598 error ("label %qE referenced outside of any function", id);
2602 /* See if we've already got this label. */
2603 decl = IDENTIFIER_LABEL_VALUE (id);
2604 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2607 decl = make_label_decl (id, /*local_p=*/0);
2611 /* Wrapper for lookup_label_1. */
2614 lookup_label (tree id)
2617 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2618 ret = lookup_label_1 (id);
2619 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2623 /* Declare a local label named ID. */
2626 declare_local_label (tree id)
2629 cp_label_binding *bind;
2631 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2632 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2633 bind = VEC_safe_push (cp_label_binding, gc,
2634 current_binding_level->shadowed_labels, NULL);
2635 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2637 decl = make_label_decl (id, /*local_p=*/1);
2643 /* Returns nonzero if it is ill-formed to jump past the declaration of
2644 DECL. Returns 2 if it's also a real problem. */
2647 decl_jump_unsafe (tree decl)
2649 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2650 with automatic storage duration is not in scope to a point where it is
2651 in scope is ill-formed unless the variable has scalar type, class type
2652 with a trivial default constructor and a trivial destructor, a
2653 cv-qualified version of one of these types, or an array of one of the
2654 preceding types and is declared without an initializer (8.5). */
2655 tree type = TREE_TYPE (decl);
2657 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2658 || type == error_mark_node)
2661 type = strip_array_types (type);
2663 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2664 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2667 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2673 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2676 identify_goto (tree decl, const location_t *locus)
2679 permerror (input_location, "jump to label %qD", decl);
2681 permerror (input_location, "jump to case label");
2683 permerror (*locus, " from here");
2686 /* Check that a single previously seen jump to a newly defined label
2687 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2688 the jump context; NAMES are the names in scope in LEVEL at the jump
2689 context; LOCUS is the source position of the jump or 0. Returns
2690 true if all is well. */
2693 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2694 bool exited_omp, const location_t *locus)
2696 cp_binding_level *b;
2697 bool identified = false, saw_eh = false, saw_omp = false;
2701 identify_goto (decl, locus);
2702 error (" exits OpenMP structured block");
2703 identified = saw_omp = true;
2706 for (b = current_binding_level; b ; b = b->level_chain)
2708 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2710 for (new_decls = b->names; new_decls != old_decls;
2711 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2712 : TREE_CHAIN (new_decls)))
2714 int problem = decl_jump_unsafe (new_decls);
2720 identify_goto (decl, locus);
2724 error (" crosses initialization of %q+#D", new_decls);
2726 permerror (input_location, " enters scope of %q+#D which has "
2727 "non-trivial destructor", new_decls);
2732 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2736 identify_goto (decl, locus);
2739 if (b->kind == sk_try)
2740 error (" enters try block");
2742 error (" enters catch block");
2745 if (b->kind == sk_omp && !saw_omp)
2749 identify_goto (decl, locus);
2752 error (" enters OpenMP structured block");
2761 check_previous_goto (tree decl, struct named_label_use_entry *use)
2763 check_previous_goto_1 (decl, use->binding_level,
2764 use->names_in_scope, use->in_omp_scope,
2765 &use->o_goto_locus);
2769 check_switch_goto (cp_binding_level* level)
2771 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2774 /* Check that a new jump to a label DECL is OK. Called by
2775 finish_goto_stmt. */
2778 check_goto (tree decl)
2780 struct named_label_entry *ent, dummy;
2781 bool saw_catch = false, identified = false;
2785 /* We can't know where a computed goto is jumping.
2786 So we assume that it's OK. */
2787 if (TREE_CODE (decl) != LABEL_DECL)
2790 /* We didn't record any information about this label when we created it,
2791 and there's not much point since it's trivial to analyze as a return. */
2792 if (decl == cdtor_label)
2795 dummy.label_decl = decl;
2796 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2797 gcc_assert (ent != NULL);
2799 /* If the label hasn't been defined yet, defer checking. */
2800 if (! DECL_INITIAL (decl))
2802 struct named_label_use_entry *new_use;
2804 /* Don't bother creating another use if the last goto had the
2805 same data, and will therefore create the same set of errors. */
2807 && ent->uses->names_in_scope == current_binding_level->names)
2810 new_use = ggc_alloc_named_label_use_entry ();
2811 new_use->binding_level = current_binding_level;
2812 new_use->names_in_scope = current_binding_level->names;
2813 new_use->o_goto_locus = input_location;
2814 new_use->in_omp_scope = false;
2816 new_use->next = ent->uses;
2817 ent->uses = new_use;
2821 if (ent->in_try_scope || ent->in_catch_scope
2822 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2824 permerror (input_location, "jump to label %q+D", decl);
2825 permerror (input_location, " from here");
2829 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2831 int u = decl_jump_unsafe (bad);
2833 if (u > 1 && DECL_ARTIFICIAL (bad))
2835 /* Can't skip init of __exception_info. */
2836 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2840 error (" skips initialization of %q+#D", bad);
2842 permerror (input_location, " enters scope of %q+#D which has "
2843 "non-trivial destructor", bad);
2846 if (ent->in_try_scope)
2847 error (" enters try block");
2848 else if (ent->in_catch_scope && !saw_catch)
2849 error (" enters catch block");
2851 if (ent->in_omp_scope)
2852 error (" enters OpenMP structured block");
2853 else if (flag_openmp)
2855 cp_binding_level *b;
2856 for (b = current_binding_level; b ; b = b->level_chain)
2858 if (b == ent->binding_level)
2860 if (b->kind == sk_omp)
2864 permerror (input_location, "jump to label %q+D", decl);
2865 permerror (input_location, " from here");
2868 error (" exits OpenMP structured block");
2875 /* Check that a return is ok wrt OpenMP structured blocks.
2876 Called by finish_return_stmt. Returns true if all is well. */
2879 check_omp_return (void)
2881 cp_binding_level *b;
2882 for (b = current_binding_level; b ; b = b->level_chain)
2883 if (b->kind == sk_omp)
2885 error ("invalid exit from OpenMP structured block");
2888 else if (b->kind == sk_function_parms)
2893 /* Define a label, specifying the location in the source file.
2894 Return the LABEL_DECL node for the label. */
2897 define_label_1 (location_t location, tree name)
2899 struct named_label_entry *ent, dummy;
2900 cp_binding_level *p;
2903 decl = lookup_label (name);
2905 dummy.label_decl = decl;
2906 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2907 gcc_assert (ent != NULL);
2909 /* After labels, make any new cleanups in the function go into their
2910 own new (temporary) binding contour. */
2911 for (p = current_binding_level;
2912 p->kind != sk_function_parms;
2914 p->more_cleanups_ok = 0;
2916 if (name == get_identifier ("wchar_t"))
2917 permerror (input_location, "label named wchar_t");
2919 if (DECL_INITIAL (decl) != NULL_TREE)
2921 error ("duplicate label %qD", decl);
2922 return error_mark_node;
2926 struct named_label_use_entry *use;
2928 /* Mark label as having been defined. */
2929 DECL_INITIAL (decl) = error_mark_node;
2930 /* Say where in the source. */
2931 DECL_SOURCE_LOCATION (decl) = location;
2933 ent->binding_level = current_binding_level;
2934 ent->names_in_scope = current_binding_level->names;
2936 for (use = ent->uses; use ; use = use->next)
2937 check_previous_goto (decl, use);
2944 /* Wrapper for define_label_1. */
2947 define_label (location_t location, tree name)
2950 bool running = timevar_cond_start (TV_NAME_LOOKUP);
2951 ret = define_label_1 (location, name);
2952 timevar_cond_stop (TV_NAME_LOOKUP, running);
2959 cp_binding_level *level;
2960 struct cp_switch *next;
2961 /* The SWITCH_STMT being built. */
2963 /* A splay-tree mapping the low element of a case range to the high
2964 element, or NULL_TREE if there is no high element. Used to
2965 determine whether or not a new case label duplicates an old case
2966 label. We need a tree, rather than simply a hash table, because
2967 of the GNU case range extension. */
2971 /* A stack of the currently active switch statements. The innermost
2972 switch statement is on the top of the stack. There is no need to
2973 mark the stack for garbage collection because it is only active
2974 during the processing of the body of a function, and we never
2975 collect at that point. */
2977 static struct cp_switch *switch_stack;
2979 /* Called right after a switch-statement condition is parsed.
2980 SWITCH_STMT is the switch statement being parsed. */
2983 push_switch (tree switch_stmt)
2985 struct cp_switch *p = XNEW (struct cp_switch);
2986 p->level = current_binding_level;
2987 p->next = switch_stack;
2988 p->switch_stmt = switch_stmt;
2989 p->cases = splay_tree_new (case_compare, NULL, NULL);
2996 struct cp_switch *cs = switch_stack;
2997 location_t switch_location;
2999 /* Emit warnings as needed. */
3000 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
3001 if (!processing_template_decl)
3002 c_do_switch_warnings (cs->cases, switch_location,
3003 SWITCH_STMT_TYPE (cs->switch_stmt),
3004 SWITCH_STMT_COND (cs->switch_stmt));
3006 splay_tree_delete (cs->cases);
3007 switch_stack = switch_stack->next;
3011 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3012 condition. Note that if TYPE and VALUE are already integral we don't
3013 really do the conversion because the language-independent
3014 warning/optimization code will work better that way. */
3017 case_conversion (tree type, tree value)
3019 if (value == NULL_TREE)
3022 if (cxx_dialect >= cxx0x
3023 && (SCOPED_ENUM_P (type)
3024 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3026 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3027 type = type_promotes_to (type);
3028 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3030 return cxx_constant_value (value);
3033 /* Note that we've seen a definition of a case label, and complain if this
3034 is a bad place for one. */
3037 finish_case_label (location_t loc, tree low_value, tree high_value)
3040 cp_binding_level *p;
3043 if (processing_template_decl)
3047 /* For templates, just add the case label; we'll do semantic
3048 analysis at instantiation-time. */
3049 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3050 return add_stmt (build_case_label (low_value, high_value, label));
3053 /* Find the condition on which this switch statement depends. */
3054 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3055 if (cond && TREE_CODE (cond) == TREE_LIST)
3056 cond = TREE_VALUE (cond);
3058 if (!check_switch_goto (switch_stack->level))
3059 return error_mark_node;
3061 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3063 low_value = case_conversion (type, low_value);
3064 high_value = case_conversion (type, high_value);
3066 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3067 low_value, high_value);
3069 /* After labels, make any new cleanups in the function go into their
3070 own new (temporary) binding contour. */
3071 for (p = current_binding_level;
3072 p->kind != sk_function_parms;
3074 p->more_cleanups_ok = 0;
3079 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3082 typename_hash (const void* k)
3085 const_tree const t = (const_tree) k;
3087 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3088 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3093 typedef struct typename_info {
3101 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3102 really of type `typename_info*' */
3105 typename_compare (const void * k1, const void * k2)
3107 const_tree const t1 = (const_tree) k1;
3108 const typename_info *const t2 = (const typename_info *) k2;
3110 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3111 && TYPE_CONTEXT (t1) == t2->scope
3112 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3113 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3114 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3117 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3118 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3120 Returns the new TYPENAME_TYPE. */
3122 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3125 build_typename_type (tree context, tree name, tree fullname,
3126 enum tag_types tag_type)
3134 if (typename_htab == NULL)
3135 typename_htab = htab_create_ggc (61, &typename_hash,
3136 &typename_compare, NULL);
3138 ti.scope = FROB_CONTEXT (context);
3140 ti.template_id = fullname;
3141 ti.enum_p = tag_type == enum_type;
3142 ti.class_p = (tag_type == class_type
3143 || tag_type == record_type
3144 || tag_type == union_type);
3145 hash = (htab_hash_pointer (ti.scope)
3146 ^ htab_hash_pointer (ti.name));
3148 /* See if we already have this type. */
3149 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3154 /* Build the TYPENAME_TYPE. */
3155 t = cxx_make_type (TYPENAME_TYPE);
3156 TYPE_CONTEXT (t) = ti.scope;
3157 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3158 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3159 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3161 /* Build the corresponding TYPE_DECL. */
3162 d = build_decl (input_location, TYPE_DECL, name, t);
3163 TYPE_NAME (TREE_TYPE (d)) = d;
3164 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3165 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3166 DECL_ARTIFICIAL (d) = 1;
3168 /* Store it in the hash table. */
3171 /* TYPENAME_TYPEs must always be compared structurally, because
3172 they may or may not resolve down to another type depending on
3173 the currently open classes. */
3174 SET_TYPE_STRUCTURAL_EQUALITY (t);
3180 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3181 provided to name the type. Returns an appropriate type, unless an
3182 error occurs, in which case error_mark_node is returned. If we
3183 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3184 return that, rather than the _TYPE it corresponds to, in other
3185 cases we look through the type decl. If TF_ERROR is set, complain
3186 about errors, otherwise be quiet. */
3189 make_typename_type (tree context, tree name, enum tag_types tag_type,
3190 tsubst_flags_t complain)
3196 if (name == error_mark_node
3197 || context == NULL_TREE
3198 || context == error_mark_node)
3199 return error_mark_node;
3203 if (!(TYPE_LANG_SPECIFIC (name)
3204 && (CLASSTYPE_IS_TEMPLATE (name)
3205 || CLASSTYPE_USE_TEMPLATE (name))))
3206 name = TYPE_IDENTIFIER (name);
3208 /* Create a TEMPLATE_ID_EXPR for the type. */
3209 name = build_nt (TEMPLATE_ID_EXPR,
3210 CLASSTYPE_TI_TEMPLATE (name),
3211 CLASSTYPE_TI_ARGS (name));
3213 else if (TREE_CODE (name) == TYPE_DECL)
3214 name = DECL_NAME (name);
3218 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3220 name = TREE_OPERAND (name, 0);
3221 if (TREE_CODE (name) == TEMPLATE_DECL)
3222 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3223 else if (TREE_CODE (name) == OVERLOAD)
3225 error ("%qD is not a type", name);
3226 return error_mark_node;
3229 if (TREE_CODE (name) == TEMPLATE_DECL)
3231 error ("%qD used without template parameters", name);
3232 return error_mark_node;
3234 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3235 gcc_assert (TYPE_P (context));
3237 if (!MAYBE_CLASS_TYPE_P (context))
3239 if (complain & tf_error)
3240 error ("%q#T is not a class", context);
3241 return error_mark_node;
3244 /* When the CONTEXT is a dependent type, NAME could refer to a
3245 dependent base class of CONTEXT. But look inside it anyway
3246 if CONTEXT is a currently open scope, in case it refers to a
3247 member of the current instantiation or a non-dependent base;
3248 lookup will stop when we hit a dependent base. */
3249 if (!dependent_scope_p (context))
3250 /* We should only set WANT_TYPE when we're a nested typename type.
3251 Then we can give better diagnostics if we find a non-type. */
3252 t = lookup_field (context, name, 2, /*want_type=*/true);
3256 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3257 return build_typename_type (context, name, fullname, tag_type);
3259 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3263 if (complain & tf_error)
3264 error (want_template ? G_("no class template named %q#T in %q#T")
3265 : G_("no type named %q#T in %q#T"), name, context);
3266 return error_mark_node;
3269 /* Pull out the template from an injected-class-name (or multiple). */
3271 t = maybe_get_template_decl_from_type_decl (t);
3273 if (TREE_CODE (t) == TREE_LIST)
3275 if (complain & tf_error)
3277 error ("lookup of %qT in %qT is ambiguous", name, context);
3278 print_candidates (t);
3280 return error_mark_node;
3283 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3285 if (complain & tf_error)
3286 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3288 return error_mark_node;
3290 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3292 if (complain & tf_error)
3293 error ("%<typename %T::%D%> names %q#T, which is not a type",
3295 return error_mark_node;
3298 if (complain & tf_error)
3299 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3301 /* If we are currently parsing a template and if T is a typedef accessed
3302 through CONTEXT then we need to remember and check access of T at
3303 template instantiation time. */
3304 add_typedef_to_current_template_for_access_check (t, context, input_location);
3307 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3309 /*entering_scope=*/0,
3310 tf_warning_or_error | tf_user);
3312 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3318 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3319 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3320 in which case error_mark_node is returned.
3322 If PARM_LIST is non-NULL, also make sure that the template parameter
3323 list of TEMPLATE_DECL matches.
3325 If COMPLAIN zero, don't complain about any errors that occur. */
3328 make_unbound_class_template (tree context, tree name, tree parm_list,
3329 tsubst_flags_t complain)
3335 name = TYPE_IDENTIFIER (name);
3336 else if (DECL_P (name))
3337 name = DECL_NAME (name);
3338 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3340 if (!dependent_type_p (context)
3341 || currently_open_class (context))
3343 tree tmpl = NULL_TREE;
3345 if (MAYBE_CLASS_TYPE_P (context))
3346 tmpl = lookup_field (context, name, 0, false);
3348 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3349 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3351 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3353 if (complain & tf_error)
3354 error ("no class template named %q#T in %q#T", name, context);
3355 return error_mark_node;
3359 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3361 if (complain & tf_error)
3363 error ("template parameters do not match template");
3364 error ("%q+D declared here", tmpl);
3366 return error_mark_node;
3369 if (complain & tf_error)
3370 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3375 /* Build the UNBOUND_CLASS_TEMPLATE. */
3376 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3377 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3378 TREE_TYPE (t) = NULL_TREE;
3379 SET_TYPE_STRUCTURAL_EQUALITY (t);
3381 /* Build the corresponding TEMPLATE_DECL. */
3382 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3383 TYPE_NAME (TREE_TYPE (d)) = d;
3384 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3385 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3386 DECL_ARTIFICIAL (d) = 1;
3387 DECL_TEMPLATE_PARMS (d) = parm_list;
3394 /* Push the declarations of builtin types into the namespace.
3395 RID_INDEX is the index of the builtin type in the array
3396 RID_POINTERS. NAME is the name used when looking up the builtin
3397 type. TYPE is the _TYPE node for the builtin type. */
3400 record_builtin_type (enum rid rid_index,
3404 tree rname = NULL_TREE, tname = NULL_TREE;
3405 tree tdecl = NULL_TREE;
3407 if ((int) rid_index < (int) RID_MAX)
3408 rname = ridpointers[(int) rid_index];
3410 tname = get_identifier (name);
3412 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3413 eliminated. Built-in types should not be looked up name; their
3414 names are keywords that the parser can recognize. However, there
3415 is code in c-common.c that uses identifier_global_value to look
3416 up built-in types by name. */
3419 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3420 DECL_ARTIFICIAL (tdecl) = 1;
3421 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3427 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3428 DECL_ARTIFICIAL (tdecl) = 1;
3430 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3433 if (!TYPE_NAME (type))
3434 TYPE_NAME (type) = tdecl;
3437 debug_hooks->type_decl (tdecl, 0);
3440 /* Record one of the standard Java types.
3441 * Declare it as having the given NAME.
3442 * If SIZE > 0, it is the size of one of the integral types;
3443 * otherwise it is the negative of the size of one of the other types. */
3446 record_builtin_java_type (const char* name, int size)
3451 type = build_nonstandard_integer_type (size, 0);
3452 type = build_distinct_type_copy (type);
3454 else if (size > -32)
3457 /* "__java_char" or ""__java_boolean". */
3458 type = build_nonstandard_integer_type (-size, 1);
3459 type = build_distinct_type_copy (type);
3460 /* Get the signed type cached and attached to the unsigned type,
3461 so it doesn't get garbage-collected at "random" times,
3462 causing potential codegen differences out of different UIDs
3463 and different alias set numbers. */
3464 stype = build_nonstandard_integer_type (-size, 0);
3465 stype = build_distinct_type_copy (stype);
3466 TREE_CHAIN (type) = stype;
3467 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3470 { /* "__java_float" or ""__java_double". */
3471 type = make_node (REAL_TYPE);
3472 TYPE_PRECISION (type) = - size;
3475 record_builtin_type (RID_MAX, name, type);
3476 decl = TYPE_NAME (type);
3478 /* Suppress generate debug symbol entries for these types,
3479 since for normal C++ they are just clutter.
3480 However, push_lang_context undoes this if extern "Java" is seen. */
3481 DECL_IGNORED_P (decl) = 1;
3483 TYPE_FOR_JAVA (type) = 1;
3487 /* Push a type into the namespace so that the back ends ignore it. */
3490 record_unknown_type (tree type, const char* name)
3492 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3493 TYPE_DECL, get_identifier (name), type));
3494 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3495 DECL_IGNORED_P (decl) = 1;
3496 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3497 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3498 TYPE_ALIGN (type) = 1;
3499 TYPE_USER_ALIGN (type) = 0;
3500 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3503 /* A string for which we should create an IDENTIFIER_NODE at
3506 typedef struct predefined_identifier
3508 /* The name of the identifier. */
3509 const char *const name;
3510 /* The place where the IDENTIFIER_NODE should be stored. */
3512 /* Nonzero if this is the name of a constructor or destructor. */
3513 const int ctor_or_dtor_p;
3514 } predefined_identifier;
3516 /* Create all the predefined identifiers. */
3519 initialize_predefined_identifiers (void)
3521 const predefined_identifier *pid;
3523 /* A table of identifiers to create at startup. */
3524 static const predefined_identifier predefined_identifiers[] = {
3525 { "C++", &lang_name_cplusplus, 0 },
3526 { "C", &lang_name_c, 0 },
3527 { "Java", &lang_name_java, 0 },
3528 /* Some of these names have a trailing space so that it is
3529 impossible for them to conflict with names written by users. */
3530 { "__ct ", &ctor_identifier, 1 },
3531 { "__base_ctor ", &base_ctor_identifier, 1 },
3532 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3533 { "__dt ", &dtor_identifier, 1 },
3534 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3535 { "__base_dtor ", &base_dtor_identifier, 1 },
3536 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3537 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3538 { "nelts", &nelts_identifier, 0 },
3539 { THIS_NAME, &this_identifier, 0 },
3540 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3541 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3542 { "_vptr", &vptr_identifier, 0 },
3543 { "__vtt_parm", &vtt_parm_identifier, 0 },
3544 { "::", &global_scope_name, 0 },
3545 { "std", &std_identifier, 0 },
3549 for (pid = predefined_identifiers; pid->name; ++pid)
3551 *pid->node = get_identifier (pid->name);
3552 if (pid->ctor_or_dtor_p)
3553 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3557 /* Create the predefined scalar types of C,
3558 and some nodes representing standard constants (0, 1, (void *)0).
3559 Initialize the global binding level.
3560 Make definitions for built-in primitive functions. */
3563 cxx_init_decl_processing (void)
3566 tree void_ftype_ptr;
3568 /* Create all the identifiers we need. */
3569 initialize_predefined_identifiers ();
3571 /* Create the global variables. */
3572 push_to_top_level ();
3574 current_function_decl = NULL_TREE;
3575 current_binding_level = NULL;
3576 /* Enter the global namespace. */
3577 gcc_assert (global_namespace == NULL_TREE);
3578 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3580 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3581 TREE_PUBLIC (global_namespace) = 1;
3582 begin_scope (sk_namespace, global_namespace);
3584 if (flag_visibility_ms_compat)
3585 default_visibility = VISIBILITY_HIDDEN;
3588 current_lang_name = lang_name_c;
3590 /* Create the `std' namespace. */
3591 push_namespace (std_identifier);
3592 std_node = current_namespace;
3595 c_common_nodes_and_builtins ();
3597 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3598 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3599 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3600 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3601 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3602 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3603 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3604 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3606 integer_two_node = build_int_cst (NULL_TREE, 2);
3608 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3609 truthvalue_type_node = boolean_type_node;
3610 truthvalue_false_node = boolean_false_node;
3611 truthvalue_true_node = boolean_true_node;
3613 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3614 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3615 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3618 record_builtin_type (RID_MAX, NULL, string_type_node);
3621 delta_type_node = ptrdiff_type_node;
3622 vtable_index_type = ptrdiff_type_node;
3624 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3625 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3626 void_ftype_ptr = build_function_type_list (void_type_node,
3627 ptr_type_node, NULL_TREE);
3629 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3631 /* C++ extensions */
3633 unknown_type_node = make_node (LANG_TYPE);
3634 record_unknown_type (unknown_type_node, "unknown type");
3636 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3637 TREE_TYPE (unknown_type_node) = unknown_type_node;
3639 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3641 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3642 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3644 init_list_type_node = make_node (LANG_TYPE);
3645 record_unknown_type (init_list_type_node, "init list");
3647 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3648 record_unknown_type (dependent_lambda_return_type_node,
3649 "undeduced lambda return type");
3652 /* Make sure we get a unique function type, so we can give
3653 its pointer type a name. (This wins for gdb.) */
3654 tree vfunc_type = make_node (FUNCTION_TYPE);
3655 TREE_TYPE (vfunc_type) = integer_type_node;
3656 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3657 layout_type (vfunc_type);
3659 vtable_entry_type = build_pointer_type (vfunc_type);
3661 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3664 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3665 layout_type (vtbl_type_node);
3666 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3667 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3668 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3669 layout_type (vtbl_ptr_type_node);
3670 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3672 push_namespace (get_identifier ("__cxxabiv1"));
3673 abi_node = current_namespace;
3676 global_type_node = make_node (LANG_TYPE);
3677 record_unknown_type (global_type_node, "global type");
3680 current_lang_name = lang_name_cplusplus;
3683 tree newattrs, extvisattr;
3684 tree newtype, deltype;
3685 tree ptr_ftype_sizetype;
3689 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3690 if (cxx_dialect == cxx98)
3693 tree bad_alloc_type_node;
3694 tree bad_alloc_decl;
3696 push_namespace (std_identifier);
3697 bad_alloc_id = get_identifier ("bad_alloc");
3698 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3699 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3701 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3702 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3706 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3709 new_eh_spec = noexcept_false_spec;
3711 /* Ensure attribs.c is initialized. */
3713 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3715 newattrs = tree_cons (get_identifier ("alloc_size"),
3716 build_tree_list (NULL_TREE, integer_one_node),
3718 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3719 newtype = build_exception_variant (newtype, new_eh_spec);
3720 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3721 deltype = build_exception_variant (deltype, empty_except_spec);
3722 push_cp_library_fn (NEW_EXPR, newtype);
3723 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3724 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3725 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3727 nullptr_type_node = make_node (NULLPTR_TYPE);
3728 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3729 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3730 TYPE_UNSIGNED (nullptr_type_node) = 1;
3731 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3732 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3733 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3734 nullptr_node = build_int_cst (nullptr_type_node, 0);
3738 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3740 /* Perform other language dependent initializations. */
3741 init_class_processing ();
3742 init_rtti_processing ();
3743 init_template_processing ();
3745 if (flag_exceptions)
3746 init_exception_processing ();
3748 if (! supports_one_only ())
3751 make_fname_decl = cp_make_fname_decl;
3752 start_fname_decls ();
3754 /* Show we use EH for cleanups. */
3755 if (flag_exceptions)
3756 using_eh_for_cleanups ();
3759 /* Generate an initializer for a function naming variable from
3760 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3761 filled in with the type of the init. */
3764 cp_fname_init (const char* name, tree *type_p)
3766 tree domain = NULL_TREE;
3768 tree init = NULL_TREE;
3773 length = strlen (name);
3774 domain = build_index_type (size_int (length));
3775 init = build_string (length + 1, name);
3778 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3779 type = build_cplus_array_type (type, domain);
3784 TREE_TYPE (init) = type;
3786 init = error_mark_node;
3791 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3792 the decl, LOC is the location to give the decl, NAME is the
3793 initialization string and TYPE_DEP indicates whether NAME depended
3794 on the type of the function. We make use of that to detect
3795 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3796 at the point of first use, so we mustn't push the decl now. */
3799 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3801 const char *const name = (type_dep && processing_template_decl
3802 ? NULL : fname_as_string (type_dep));
3804 tree init = cp_fname_init (name, &type);
3805 tree decl = build_decl (loc, VAR_DECL, id, type);
3808 free (CONST_CAST (char *, name));
3810 /* As we're using pushdecl_with_scope, we must set the context. */
3811 DECL_CONTEXT (decl) = current_function_decl;
3812 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3814 TREE_STATIC (decl) = 1;
3815 TREE_READONLY (decl) = 1;
3816 DECL_ARTIFICIAL (decl) = 1;
3818 TREE_USED (decl) = 1;
3820 if (current_function_decl)
3822 cp_binding_level *b = current_binding_level;
3823 if (b->kind == sk_function_parms)
3824 return error_mark_node;
3825 while (b->level_chain->kind != sk_function_parms)
3827 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3828 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3829 LOOKUP_ONLYCONVERTING);
3833 DECL_THIS_STATIC (decl) = true;
3834 pushdecl_top_level_and_finish (decl, init);
3841 builtin_function_1 (tree decl, tree context, bool is_global)
3843 tree id = DECL_NAME (decl);
3844 const char *name = IDENTIFIER_POINTER (id);
3846 retrofit_lang_decl (decl);
3848 DECL_ARTIFICIAL (decl) = 1;
3849 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3850 SET_DECL_LANGUAGE (decl, lang_c);
3851 /* Runtime library routines are, by definition, available in an
3852 external shared object. */
3853 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3854 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3856 DECL_CONTEXT (decl) = context;
3859 pushdecl_top_level (decl);
3863 /* A function in the user's namespace should have an explicit
3864 declaration before it is used. Mark the built-in function as
3865 anticipated but not actually declared. */
3866 if (name[0] != '_' || name[1] != '_')
3867 DECL_ANTICIPATED (decl) = 1;
3868 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3870 size_t len = strlen (name);
3872 /* Treat __*_chk fortification functions as anticipated as well,
3873 unless they are __builtin_*. */
3874 if (len > strlen ("___chk")
3875 && memcmp (name + len - strlen ("_chk"),
3876 "_chk", strlen ("_chk") + 1) == 0)
3877 DECL_ANTICIPATED (decl) = 1;
3884 cxx_builtin_function (tree decl)
3886 tree id = DECL_NAME (decl);
3887 const char *name = IDENTIFIER_POINTER (id);
3888 /* All builtins that don't begin with an '_' should additionally
3889 go in the 'std' namespace. */
3892 tree decl2 = copy_node(decl);
3893 push_namespace (std_identifier);
3894 builtin_function_1 (decl2, std_node, false);
3898 return builtin_function_1 (decl, NULL_TREE, false);
3901 /* Like cxx_builtin_function, but guarantee the function is added to the global
3902 scope. This is to allow function specific options to add new machine
3903 dependent builtins when the target ISA changes via attribute((target(...)))
3904 which saves space on program startup if the program does not use non-generic
3908 cxx_builtin_function_ext_scope (tree decl)
3911 tree id = DECL_NAME (decl);
3912 const char *name = IDENTIFIER_POINTER (id);
3913 /* All builtins that don't begin with an '_' should additionally
3914 go in the 'std' namespace. */
3917 tree decl2 = copy_node(decl);
3918 push_namespace (std_identifier);
3919 builtin_function_1 (decl2, std_node, true);
3923 return builtin_function_1 (decl, NULL_TREE, true);
3926 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3927 function. Not called directly. */
3930 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3932 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3933 DECL_EXTERNAL (fn) = 1;
3934 TREE_PUBLIC (fn) = 1;
3935 DECL_ARTIFICIAL (fn) = 1;
3936 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3937 SET_DECL_LANGUAGE (fn, lang_c);
3938 /* Runtime library routines are, by definition, available in an
3939 external shared object. */
3940 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3941 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3945 /* Returns the _DECL for a library function with C linkage.
3946 We assume that such functions never throw; if this is incorrect,
3947 callers should unset TREE_NOTHROW. */
3950 build_library_fn (tree name, tree type)
3952 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3953 TREE_NOTHROW (fn) = 1;
3957 /* Returns the _DECL for a library function with C++ linkage. */
3960 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3962 tree fn = build_library_fn_1 (name, operator_code, type);
3963 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3964 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3965 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3969 /* Like build_library_fn, but takes a C string instead of an
3973 build_library_fn_ptr (const char* name, tree type)
3975 return build_library_fn (get_identifier (name), type);
3978 /* Like build_cp_library_fn, but takes a C string instead of an
3982 build_cp_library_fn_ptr (const char* name, tree type)
3984 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3987 /* Like build_library_fn, but also pushes the function so that we will
3988 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3989 may throw exceptions listed in RAISES. */
3992 push_library_fn (tree name, tree type, tree raises)
3997 type = build_exception_variant (type, raises);
3999 fn = build_library_fn (name, type);
4000 pushdecl_top_level (fn);
4004 /* Like build_cp_library_fn, but also pushes the function so that it
4005 will be found by normal lookup. */
4008 push_cp_library_fn (enum tree_code operator_code, tree type)
4010 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4015 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4019 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4023 push_void_library_fn (tree name, tree parmtypes)
4025 tree type = build_function_type (void_type_node, parmtypes);
4026 return push_library_fn (name, type, NULL_TREE);
4029 /* Like push_library_fn, but also note that this function throws
4030 and does not return. Used for __throw_foo and the like. */
4033 push_throw_library_fn (tree name, tree type)
4035 tree fn = push_library_fn (name, type, NULL_TREE);
4036 TREE_THIS_VOLATILE (fn) = 1;
4037 TREE_NOTHROW (fn) = 0;
4041 /* When we call finish_struct for an anonymous union, we create
4042 default copy constructors and such. But, an anonymous union
4043 shouldn't have such things; this function undoes the damage to the
4044 anonymous union type T.
4046 (The reason that we create the synthesized methods is that we don't
4047 distinguish `union { int i; }' from `typedef union { int i; } U'.
4048 The first is an anonymous union; the second is just an ordinary
4052 fixup_anonymous_aggr (tree t)
4056 /* Wipe out memory of synthesized methods. */
4057 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4058 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4059 TYPE_HAS_COPY_CTOR (t) = 0;
4060 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4061 TYPE_HAS_COPY_ASSIGN (t) = 0;
4062 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4064 /* Splice the implicitly generated functions out of the TYPE_METHODS
4066 q = &TYPE_METHODS (t);
4069 if (DECL_ARTIFICIAL (*q))
4070 *q = TREE_CHAIN (*q);
4072 q = &DECL_CHAIN (*q);
4075 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4076 if (TYPE_METHODS (t))
4078 tree decl = TYPE_MAIN_DECL (t);
4080 if (TREE_CODE (t) != UNION_TYPE)
4081 error_at (DECL_SOURCE_LOCATION (decl),
4082 "an anonymous struct cannot have function members");
4084 error_at (DECL_SOURCE_LOCATION (decl),
4085 "an anonymous union cannot have function members");
4088 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4089 assignment operators (because they cannot have these methods themselves).
4090 For anonymous unions this is already checked because they are not allowed
4091 in any union, otherwise we have to check it. */
4092 if (TREE_CODE (t) != UNION_TYPE)
4096 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4097 if (TREE_CODE (field) == FIELD_DECL)
4099 type = TREE_TYPE (field);
4100 if (CLASS_TYPE_P (type))
4102 if (TYPE_NEEDS_CONSTRUCTING (type))
4103 error ("member %q+#D with constructor not allowed "
4104 "in anonymous aggregate", field);
4105 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4106 error ("member %q+#D with destructor not allowed "
4107 "in anonymous aggregate", field);
4108 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4109 error ("member %q+#D with copy assignment operator "
4110 "not allowed in anonymous aggregate", field);
4116 /* Make sure that a declaration with no declarator is well-formed, i.e.
4117 just declares a tagged type or anonymous union.
4119 Returns the type declared; or NULL_TREE if none. */
4122 check_tag_decl (cp_decl_specifier_seq *declspecs)
4124 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4125 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4126 /* If a class, struct, or enum type is declared by the DECLSPECS
4127 (i.e, if a class-specifier, enum-specifier, or non-typename
4128 elaborated-type-specifier appears in the DECLSPECS),
4129 DECLARED_TYPE is set to the corresponding type. */
4130 tree declared_type = NULL_TREE;
4131 bool error_p = false;
4133 if (declspecs->multiple_types_p)
4134 error ("multiple types in one declaration");
4135 else if (declspecs->redefined_builtin_type)
4137 if (!in_system_header)
4138 permerror (input_location, "redeclaration of C++ built-in type %qT",
4139 declspecs->redefined_builtin_type);
4144 && TYPE_P (declspecs->type)
4145 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4146 && MAYBE_CLASS_TYPE_P (declspecs->type))
4147 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4148 declared_type = declspecs->type;
4149 else if (declspecs->type == error_mark_node)
4151 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4152 permerror (input_location, "declaration does not declare anything");
4153 else if (declared_type != NULL_TREE && type_uses_auto (declared_type))
4155 error ("%<auto%> can only be specified for variables "
4156 "or function declarations");
4157 return error_mark_node;
4159 /* Check for an anonymous union. */
4160 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4161 && TYPE_ANONYMOUS_P (declared_type))
4163 /* 7/3 In a simple-declaration, the optional init-declarator-list
4164 can be omitted only when declaring a class (clause 9) or
4165 enumeration (7.2), that is, when the decl-specifier-seq contains
4166 either a class-specifier, an elaborated-type-specifier with
4167 a class-key (9.1), or an enum-specifier. In these cases and
4168 whenever a class-specifier or enum-specifier is present in the
4169 decl-specifier-seq, the identifiers in these specifiers are among
4170 the names being declared by the declaration (as class-name,
4171 enum-names, or enumerators, depending on the syntax). In such
4172 cases, and except for the declaration of an unnamed bit-field (9.6),
4173 the decl-specifier-seq shall introduce one or more names into the
4174 program, or shall redeclare a name introduced by a previous
4175 declaration. [Example:
4176 enum { }; // ill-formed
4177 typedef class { }; // ill-formed
4181 error ("missing type-name in typedef-declaration");
4184 /* Anonymous unions are objects, so they can have specifiers. */;
4185 SET_ANON_AGGR_TYPE_P (declared_type);
4187 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4188 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4193 if (declspecs->specs[(int)ds_inline]
4194 || declspecs->specs[(int)ds_virtual])
4195 error ("%qs can only be specified for functions",
4196 declspecs->specs[(int)ds_inline]
4197 ? "inline" : "virtual");
4199 && (!current_class_type
4200 || current_scope () != current_class_type))
4201 error ("%<friend%> can only be specified inside a class");
4202 else if (declspecs->specs[(int)ds_explicit])
4203 error ("%<explicit%> can only be specified for constructors");
4204 else if (declspecs->storage_class)
4205 error ("a storage class can only be specified for objects "
4207 else if (declspecs->specs[(int)ds_const]
4208 || declspecs->specs[(int)ds_volatile]
4209 || declspecs->specs[(int)ds_restrict]
4210 || declspecs->specs[(int)ds_thread])
4211 error ("qualifiers can only be specified for objects "
4213 else if (saw_typedef)
4214 warning (0, "%<typedef%> was ignored in this declaration");
4215 else if (declspecs->specs[(int) ds_constexpr])
4216 error ("%<constexpr%> cannot be used for type declarations");
4219 if (declspecs->attributes && declared_type)
4221 location_t loc = input_location;
4222 if (!CLASS_TYPE_P (declared_type)
4223 || !CLASSTYPE_TEMPLATE_INSTANTIATION (declared_type))
4224 /* For a non-template class, use the name location; for a template
4225 class (an explicit instantiation), use the current location. */
4226 input_location = location_of (declared_type);
4227 warning (0, "attribute ignored in declaration of %q#T", declared_type);
4228 warning (0, "attribute for %q#T must follow the %qs keyword",
4229 declared_type, class_key_or_enum_as_string (declared_type));
4230 input_location = loc;
4233 return declared_type;
4236 /* Called when a declaration is seen that contains no names to declare.
4237 If its type is a reference to a structure, union or enum inherited
4238 from a containing scope, shadow that tag name for the current scope
4239 with a forward reference.
4240 If its type defines a new named structure or union
4241 or defines an enum, it is valid but we need not do anything here.
4242 Otherwise, it is an error.
4244 C++: may have to grok the declspecs to learn about static,
4245 complain for anonymous unions.
4247 Returns the TYPE declared -- or NULL_TREE if none. */
4250 shadow_tag (cp_decl_specifier_seq *declspecs)
4252 tree t = check_tag_decl (declspecs);
4257 if (maybe_process_partial_specialization (t) == error_mark_node)
4260 /* This is where the variables in an anonymous union are
4261 declared. An anonymous union declaration looks like:
4263 because there is no declarator after the union, the parser
4264 sends that declaration here. */
4265 if (ANON_AGGR_TYPE_P (t))
4267 fixup_anonymous_aggr (t);
4269 if (TYPE_FIELDS (t))
4271 tree decl = grokdeclarator (/*declarator=*/NULL,
4272 declspecs, NORMAL, 0, NULL);
4273 finish_anon_union (decl);
4280 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4283 groktypename (cp_decl_specifier_seq *type_specifiers,
4284 const cp_declarator *declarator,
4285 bool is_template_arg)
4289 enum decl_context context
4290 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4291 attrs = type_specifiers->attributes;
4292 type_specifiers->attributes = NULL_TREE;
4293 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4294 if (attrs && type != error_mark_node)
4296 if (CLASS_TYPE_P (type))
4297 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4298 "outside of definition", type);
4299 else if (MAYBE_CLASS_TYPE_P (type))
4300 /* A template type parameter or other dependent type. */
4301 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4302 "type %qT without an associated declaration", type);
4304 cplus_decl_attributes (&type, attrs, 0);
4309 /* Process a DECLARATOR for a function-scope variable declaration,
4310 namespace-scope variable declaration, or function declaration.
4311 (Function definitions go through start_function; class member
4312 declarations appearing in the body of the class go through
4313 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4314 If an error occurs, the error_mark_node is returned instead.
4316 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4317 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4318 for an explicitly defaulted function, or SD_DELETED for an explicitly
4319 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4320 implicitly initialized via a default constructor. ATTRIBUTES and
4321 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4323 The scope represented by the context of the returned DECL is pushed
4324 (if it is not the global namespace) and is assigned to
4325 *PUSHED_SCOPE_P. The caller is then responsible for calling
4326 pop_scope on *PUSHED_SCOPE_P if it is set. */
4329 start_decl (const cp_declarator *declarator,
4330 cp_decl_specifier_seq *declspecs,
4333 tree prefix_attributes,
4334 tree *pushed_scope_p)
4342 *pushed_scope_p = NULL_TREE;
4344 /* An object declared as __attribute__((deprecated)) suppresses
4345 warnings of uses of other deprecated items. */
4346 if (lookup_attribute ("deprecated", attributes))
4347 deprecated_state = DEPRECATED_SUPPRESS;
4349 attributes = chainon (attributes, prefix_attributes);
4351 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4354 deprecated_state = DEPRECATED_NORMAL;
4356 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4357 || decl == error_mark_node)
4358 return error_mark_node;
4360 context = CP_DECL_CONTEXT (decl);
4361 if (context != global_namespace)
4362 *pushed_scope_p = push_scope (context);
4365 /* Is it valid for this decl to have an initializer at all?
4366 If not, set INITIALIZED to zero, which will indirectly
4367 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4368 switch (TREE_CODE (decl))
4371 error ("typedef %qD is initialized (use decltype instead)", decl);
4372 return error_mark_node;
4375 if (initialized == SD_DELETED)
4376 /* We'll handle the rest of the semantics later, but we need to
4377 set this now so it's visible to duplicate_decls. */
4378 DECL_DELETED_FN (decl) = 1;
4387 if (! toplevel_bindings_p ()
4388 && DECL_EXTERNAL (decl))
4389 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4391 DECL_EXTERNAL (decl) = 0;
4392 if (toplevel_bindings_p ())
4393 TREE_STATIC (decl) = 1;
4395 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4397 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4398 record_key_method_defined (decl);
4400 /* If this is a typedef that names the class for linkage purposes
4401 (7.1.3p8), apply any attributes directly to the type. */
4402 if (TREE_CODE (decl) == TYPE_DECL
4403 && TAGGED_TYPE_P (TREE_TYPE (decl))
4404 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4405 flags = ATTR_FLAG_TYPE_IN_PLACE;
4409 /* Set attributes here so if duplicate decl, will have proper attributes. */
4410 cplus_decl_attributes (&decl, attributes, flags);
4412 /* Dllimported symbols cannot be defined. Static data members (which
4413 can be initialized in-class and dllimported) go through grokfield,
4414 not here, so we don't need to exclude those decls when checking for
4416 if (initialized && DECL_DLLIMPORT_P (decl))
4418 error ("definition of %q#D is marked %<dllimport%>", decl);
4419 DECL_DLLIMPORT_P (decl) = 0;
4422 /* If #pragma weak was used, mark the decl weak now. */
4423 if (!processing_template_decl)
4424 maybe_apply_pragma_weak (decl);
4426 if (TREE_CODE (decl) == FUNCTION_DECL
4427 && DECL_DECLARED_INLINE_P (decl)
4428 && DECL_UNINLINABLE (decl)
4429 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4430 warning (0, "inline function %q+D given attribute noinline", decl);
4432 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4434 if (TREE_CODE (decl) == VAR_DECL)
4436 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4437 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4438 error ("%q#D is not a static member of %q#T", decl, context);
4441 if (DECL_CONTEXT (field) != context)
4443 if (!same_type_p (DECL_CONTEXT (field), context))
4444 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4445 "to be defined as %<%T::%D%>",
4446 DECL_CONTEXT (field), DECL_NAME (decl),
4447 context, DECL_NAME (decl));
4448 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4450 if (processing_specialization
4451 && template_class_depth (context) == 0
4452 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4453 error ("template header not allowed in member definition "
4454 "of explicitly specialized class");
4455 /* Static data member are tricky; an in-class initialization
4456 still doesn't provide a definition, so the in-class
4457 declaration will have DECL_EXTERNAL set, but will have an
4458 initialization. Thus, duplicate_decls won't warn
4459 about this situation, and so we check here. */
4460 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4461 error ("duplicate initialization of %qD", decl);
4462 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4464 if (declspecs->specs[(int) ds_constexpr]
4465 && !DECL_DECLARED_CONSTEXPR_P (field))
4466 error ("%qD declared %<constexpr%> outside its class", field);
4471 tree field = check_classfn (context, decl,
4472 (processing_template_decl
4473 > template_class_depth (context))
4474 ? current_template_parms
4476 if (field && field != error_mark_node
4477 && duplicate_decls (decl, field,
4478 /*newdecl_is_friend=*/false))
4482 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4483 DECL_IN_AGGR_P (decl) = 0;
4484 /* Do not mark DECL as an explicit specialization if it was not
4485 already marked as an instantiation; a declaration should
4486 never be marked as a specialization unless we know what
4487 template is being specialized. */
4488 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4490 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4492 /* [temp.expl.spec] An explicit specialization of a static data
4493 member of a template is a definition if the declaration
4494 includes an initializer; otherwise, it is a declaration.
4496 We check for processing_specialization so this only applies
4497 to the new specialization syntax. */
4498 if (!initialized && processing_specialization)
4499 DECL_EXTERNAL (decl) = 1;
4502 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4503 /* Aliases are definitions. */
4505 permerror (input_location, "declaration of %q#D outside of class is not definition",
4509 was_public = TREE_PUBLIC (decl);
4511 /* Enter this declaration into the symbol table. */
4512 decl = maybe_push_decl (decl);
4514 if (processing_template_decl)
4515 decl = push_template_decl (decl);
4516 if (decl == error_mark_node)
4517 return error_mark_node;
4519 /* Tell the back end to use or not use .common as appropriate. If we say
4520 -fconserve-space, we want this to save .data space, at the expense of
4521 wrong semantics. If we say -fno-conserve-space, we want this to
4522 produce errors about redefs; to do this we force variables into the
4524 if (flag_conserve_space
4525 && TREE_CODE (decl) == VAR_DECL
4526 && TREE_PUBLIC (decl)
4527 && !DECL_THREAD_LOCAL_P (decl)
4528 && !have_global_bss_p ())
4529 DECL_COMMON (decl) = 1;
4531 if (TREE_CODE (decl) == VAR_DECL
4532 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4533 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4535 /* This is a const variable with implicit 'static'. Set
4536 DECL_THIS_STATIC so we can tell it from variables that are
4537 !TREE_PUBLIC because of the anonymous namespace. */
4538 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4539 DECL_THIS_STATIC (decl) = 1;
4542 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4543 start_decl_1 (decl, initialized);
4548 /* Process the declaration of a variable DECL. INITIALIZED is true
4549 iff DECL is explicitly initialized. (INITIALIZED is false if the
4550 variable is initialized via an implicitly-called constructor.)
4551 This function must be called for ordinary variables (including, for
4552 example, implicit instantiations of templates), but must not be
4553 called for template declarations. */
4556 start_decl_1 (tree decl, bool initialized)
4560 bool aggregate_definition_p;
4562 gcc_assert (!processing_template_decl);
4564 if (error_operand_p (decl))
4567 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4569 type = TREE_TYPE (decl);
4570 complete_p = COMPLETE_TYPE_P (type);
4571 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4573 /* If an explicit initializer is present, or if this is a definition
4574 of an aggregate, then we need a complete type at this point.
4575 (Scalars are always complete types, so there is nothing to
4576 check.) This code just sets COMPLETE_P; errors (if necessary)
4577 are issued below. */
4578 if ((initialized || aggregate_definition_p)
4580 && COMPLETE_TYPE_P (complete_type (type)))
4583 /* We will not yet have set TREE_READONLY on DECL if the type
4584 was "const", but incomplete, before this point. But, now, we
4585 have a complete type, so we can try again. */
4586 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4590 /* Is it valid for this decl to have an initializer at all? */
4592 /* Don't allow initializations for incomplete types except for
4593 arrays which might be completed by the initialization. */
4595 ; /* A complete type is ok. */
4596 else if (type_uses_auto (type))
4597 ; /* An auto type is ok. */
4598 else if (TREE_CODE (type) != ARRAY_TYPE)
4600 error ("variable %q#D has initializer but incomplete type", decl);
4601 type = TREE_TYPE (decl) = error_mark_node;
4603 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4605 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4606 error ("elements of array %q#D have incomplete type", decl);
4607 /* else we already gave an error in start_decl. */
4610 else if (aggregate_definition_p && !complete_p)
4612 if (type_uses_auto (type))
4613 error ("declaration of %q#D has no initializer", decl);
4615 error ("aggregate %q#D has incomplete type and cannot be defined",
4617 /* Change the type so that assemble_variable will give
4618 DECL an rtl we can live with: (mem (const_int 0)). */
4619 type = TREE_TYPE (decl) = error_mark_node;
4622 /* Create a new scope to hold this declaration if necessary.
4623 Whether or not a new scope is necessary cannot be determined
4624 until after the type has been completed; if the type is a
4625 specialization of a class template it is not until after
4626 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4627 will be set correctly. */
4628 maybe_push_cleanup_level (type);
4631 /* Handle initialization of references. DECL, TYPE, and INIT have the
4632 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4633 but will be set to a new CLEANUP_STMT if a temporary is created
4634 that must be destroyed subsequently.
4636 Returns an initializer expression to use to initialize DECL, or
4637 NULL if the initialization can be performed statically.
4639 Quotes on semantics can be found in ARM 8.4.3. */
4642 grok_reference_init (tree decl, tree type, tree init, int flags)
4644 if (init == NULL_TREE)
4646 if ((DECL_LANG_SPECIFIC (decl) == 0
4647 || DECL_IN_AGGR_P (decl) == 0)
4648 && ! DECL_THIS_EXTERN (decl))
4649 error ("%qD declared as reference but not initialized", decl);
4653 if (TREE_CODE (init) == TREE_LIST)
4654 init = build_x_compound_expr_from_list (init, ELK_INIT,
4655 tf_warning_or_error);
4657 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4658 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4659 /* Note: default conversion is only called in very special cases. */
4660 init = decay_conversion (init);
4662 /* Convert INIT to the reference type TYPE. This may involve the
4663 creation of a temporary, whose lifetime must be the same as that
4664 of the reference. If so, a DECL_EXPR for the temporary will be
4665 added just after the DECL_EXPR for DECL. That's why we don't set
4666 DECL_INITIAL for local references (instead assigning to them
4667 explicitly); we need to allow the temporary to be initialized
4669 return initialize_reference (type, init, flags,
4670 tf_warning_or_error);
4673 /* Designated initializers in arrays are not supported in GNU C++.
4674 The parser cannot detect this error since it does not know whether
4675 a given brace-enclosed initializer is for a class type or for an
4676 array. This function checks that CE does not use a designated
4677 initializer. If it does, an error is issued. Returns true if CE
4678 is valid, i.e., does not have a designated initializer. */
4681 check_array_designated_initializer (const constructor_elt *ce,
4682 unsigned HOST_WIDE_INT index)
4684 /* Designated initializers for array elements are not supported. */
4687 /* The parser only allows identifiers as designated
4689 if (ce->index == error_mark_node)
4690 error ("name used in a GNU-style designated "
4691 "initializer for an array");
4692 else if (TREE_CODE (ce->index) == INTEGER_CST)
4694 /* A C99 designator is OK if it matches the current index. */
4695 if (TREE_INT_CST_LOW (ce->index) == index)
4698 sorry ("non-trivial designated initializers not supported");
4702 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4703 error ("name %qD used in a GNU-style designated "
4704 "initializer for an array", ce->index);
4712 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4713 array until we finish parsing the initializer. If that's the
4714 situation we're in, update DECL accordingly. */
4717 maybe_deduce_size_from_array_init (tree decl, tree init)
4719 tree type = TREE_TYPE (decl);
4721 if (TREE_CODE (type) == ARRAY_TYPE
4722 && TYPE_DOMAIN (type) == NULL_TREE
4723 && TREE_CODE (decl) != TYPE_DECL)
4725 /* do_default is really a C-ism to deal with tentative definitions.
4726 But let's leave it here to ease the eventual merge. */
4727 int do_default = !DECL_EXTERNAL (decl);
4728 tree initializer = init ? init : DECL_INITIAL (decl);
4731 /* Check that there are no designated initializers in INIT, as
4732 those are not supported in GNU C++, and as the middle-end
4733 will crash if presented with a non-numeric designated
4735 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4737 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4738 constructor_elt *ce;
4740 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4741 if (!check_array_designated_initializer (ce, i))
4747 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4751 error ("initializer fails to determine size of %qD", decl);
4752 TREE_TYPE (decl) = error_mark_node;
4754 else if (failure == 2)
4758 error ("array size missing in %qD", decl);
4759 TREE_TYPE (decl) = error_mark_node;
4761 /* If a `static' var's size isn't known, make it extern as
4762 well as static, so it does not get allocated. If it's not
4763 `static', then don't mark it extern; finish_incomplete_decl
4764 will give it a default size and it will get allocated. */
4765 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4766 DECL_EXTERNAL (decl) = 1;
4768 else if (failure == 3)
4770 error ("zero-size array %qD", decl);
4771 TREE_TYPE (decl) = error_mark_node;
4775 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4777 relayout_decl (decl);
4781 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4782 any appropriate error messages regarding the layout. */
4785 layout_var_decl (tree decl)
4789 type = TREE_TYPE (decl);
4790 if (type == error_mark_node)
4793 /* If we haven't already layed out this declaration, do so now.
4794 Note that we must not call complete type for an external object
4795 because it's type might involve templates that we are not
4796 supposed to instantiate yet. (And it's perfectly valid to say
4797 `extern X x' for some incomplete type `X'.) */
4798 if (!DECL_EXTERNAL (decl))
4799 complete_type (type);
4800 if (!DECL_SIZE (decl)
4801 && TREE_TYPE (decl) != error_mark_node
4802 && (COMPLETE_TYPE_P (type)
4803 || (TREE_CODE (type) == ARRAY_TYPE
4804 && !TYPE_DOMAIN (type)
4805 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4806 layout_decl (decl, 0);
4808 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4810 /* An automatic variable with an incomplete type: that is an error.
4811 Don't talk about array types here, since we took care of that
4812 message in grokdeclarator. */
4813 error ("storage size of %qD isn%'t known", decl);
4814 TREE_TYPE (decl) = error_mark_node;
4817 /* Keep this code around in case we later want to control debug info
4818 based on whether a type is "used". (jason 1999-11-11) */
4820 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4821 /* Let debugger know it should output info for this type. */
4822 note_debug_info_needed (ttype);
4824 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4825 note_debug_info_needed (DECL_CONTEXT (decl));
4828 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4829 && DECL_SIZE (decl) != NULL_TREE
4830 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4832 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4833 constant_expression_warning (DECL_SIZE (decl));
4836 error ("storage size of %qD isn%'t constant", decl);
4837 TREE_TYPE (decl) = error_mark_node;
4842 /* If a local static variable is declared in an inline function, or if
4843 we have a weak definition, we must endeavor to create only one
4844 instance of the variable at link-time. */
4847 maybe_commonize_var (tree decl)
4849 /* Static data in a function with comdat linkage also has comdat
4851 if (TREE_STATIC (decl)
4852 /* Don't mess with __FUNCTION__. */
4853 && ! DECL_ARTIFICIAL (decl)
4854 && DECL_FUNCTION_SCOPE_P (decl)
4855 && vague_linkage_p (DECL_CONTEXT (decl)))
4859 /* With weak symbols, we simply make the variable COMDAT;
4860 that will cause copies in multiple translations units to
4862 comdat_linkage (decl);
4866 if (DECL_INITIAL (decl) == NULL_TREE
4867 || DECL_INITIAL (decl) == error_mark_node)
4869 /* Without weak symbols, we can use COMMON to merge
4870 uninitialized variables. */
4871 TREE_PUBLIC (decl) = 1;
4872 DECL_COMMON (decl) = 1;
4876 /* While for initialized variables, we must use internal
4877 linkage -- which means that multiple copies will not
4879 TREE_PUBLIC (decl) = 0;
4880 DECL_COMMON (decl) = 0;
4881 warning_at (input_location, 0,
4882 "sorry: semantics of inline function static "
4883 "data %q+#D are wrong (you%'ll wind up "
4884 "with multiple copies)", decl);
4885 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4886 " you can work around this by removing "
4891 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4892 /* Set it up again; we might have set DECL_INITIAL since the last
4894 comdat_linkage (decl);
4897 /* Issue an error message if DECL is an uninitialized const variable. */
4900 check_for_uninitialized_const_var (tree decl)
4902 tree type = strip_array_types (TREE_TYPE (decl));
4904 /* ``Unless explicitly declared extern, a const object does not have
4905 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4907 if (TREE_CODE (decl) == VAR_DECL
4908 && TREE_CODE (type) != REFERENCE_TYPE
4909 && CP_TYPE_CONST_P (type)
4910 && !DECL_INITIAL (decl))
4912 tree field = default_init_uninitialized_part (type);
4916 permerror (DECL_SOURCE_LOCATION (decl),
4917 "uninitialized const %qD", decl);
4919 if (CLASS_TYPE_P (type))
4921 tree defaulted_ctor;
4923 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4924 "%q#T has no user-provided default constructor", type);
4925 defaulted_ctor = in_class_defaulted_default_constructor (type);
4927 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4928 "constructor is not user-provided because it is "
4929 "explicitly defaulted in the class body");
4930 inform (0, "and the implicitly-defined constructor does not "
4931 "initialize %q+#D", field);
4936 /* Structure holding the current initializer being processed by reshape_init.
4937 CUR is a pointer to the current element being processed, END is a pointer
4938 after the last element present in the initializer. */
4939 typedef struct reshape_iterator_t
4941 constructor_elt *cur;
4942 constructor_elt *end;
4945 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4947 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4948 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4949 initialized. If there are no more such fields, the return value
4953 next_initializable_field (tree field)
4956 && (TREE_CODE (field) != FIELD_DECL
4957 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4958 || DECL_ARTIFICIAL (field)))
4959 field = DECL_CHAIN (field);
4964 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4965 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4966 INTEGER_CST representing the size of the array minus one (the maximum index),
4967 or NULL_TREE if the array was declared without specifying the size. D is
4968 the iterator within the constructor. */
4971 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4972 tsubst_flags_t complain)
4975 bool sized_array_p = (max_index != NULL_TREE);
4976 unsigned HOST_WIDE_INT max_index_cst = 0;
4977 unsigned HOST_WIDE_INT index;
4979 /* The initializer for an array is always a CONSTRUCTOR. */
4980 new_init = build_constructor (init_list_type_node, NULL);
4984 /* Minus 1 is used for zero sized arrays. */
4985 if (integer_all_onesp (max_index))
4988 if (host_integerp (max_index, 1))
4989 max_index_cst = tree_low_cst (max_index, 1);
4990 /* sizetype is sign extended, not zero extended. */
4992 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4996 /* Loop until there are no more initializers. */
4998 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5003 check_array_designated_initializer (d->cur, index);
5004 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5006 if (elt_init == error_mark_node)
5007 return error_mark_node;
5008 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5009 size_int (index), elt_init);
5010 if (!TREE_CONSTANT (elt_init))
5011 TREE_CONSTANT (new_init) = false;
5017 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5018 Parameters are the same of reshape_init_r. */
5021 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5023 tree max_index = NULL_TREE;
5025 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5027 if (TYPE_DOMAIN (type))
5028 max_index = array_type_nelts (type);
5030 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5033 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5034 Parameters are the same of reshape_init_r. */
5037 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5039 tree max_index = NULL_TREE;
5041 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5043 if (COMPOUND_LITERAL_P (d->cur->value))
5045 tree value = d->cur->value;
5046 if (!same_type_p (TREE_TYPE (value), type))
5048 if (complain & tf_error)
5049 error ("invalid type %qT as initializer for a vector of type %qT",
5050 TREE_TYPE (d->cur->value), type);
5051 value = error_mark_node;
5057 /* For a vector, we initialize it as an array of the appropriate size. */
5058 if (TREE_CODE (type) == VECTOR_TYPE)
5059 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5061 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5064 /* Subroutine of reshape_init_r, processes the initializers for classes
5065 or union. Parameters are the same of reshape_init_r. */
5068 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5069 tsubst_flags_t complain)
5074 gcc_assert (CLASS_TYPE_P (type));
5076 /* The initializer for a class is always a CONSTRUCTOR. */
5077 new_init = build_constructor (init_list_type_node, NULL);
5078 field = next_initializable_field (TYPE_FIELDS (type));
5084 An initializer for an aggregate member that is an
5085 empty class shall have the form of an empty
5086 initializer-list {}. */
5087 if (!first_initializer_p)
5089 if (complain & tf_error)
5090 error ("initializer for %qT must be brace-enclosed", type);
5091 return error_mark_node;
5096 /* Loop through the initializable fields, gathering initializers. */
5097 while (d->cur != d->end)
5101 /* Handle designated initializers, as an extension. */
5104 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5106 if (complain & tf_error)
5107 error ("%<[%E] =%> used in a GNU-style designated initializer"
5108 " for class %qT", d->cur->index, type);
5109 return error_mark_node;
5112 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5114 if (!field || TREE_CODE (field) != FIELD_DECL)
5116 if (complain & tf_error)
5117 error ("%qT has no non-static data member named %qD", type,
5119 return error_mark_node;
5123 /* If we processed all the member of the class, we are done. */
5127 field_init = reshape_init_r (TREE_TYPE (field), d,
5128 /*first_initializer_p=*/false, complain);
5129 if (field_init == error_mark_node)
5130 return error_mark_node;
5132 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5136 When a union is initialized with a brace-enclosed
5137 initializer, the braces shall only contain an
5138 initializer for the first member of the union. */
5139 if (TREE_CODE (type) == UNION_TYPE)
5142 field = next_initializable_field (DECL_CHAIN (field));
5148 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5149 designators are not valid; either complain or return true to indicate
5150 that reshape_init_r should return error_mark_node. */
5153 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5157 if (complain & tf_error)
5158 error ("C99 designator %qE outside aggregate initializer",
5166 /* Subroutine of reshape_init, which processes a single initializer (part of
5167 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5168 iterator within the CONSTRUCTOR which points to the initializer to process.
5169 FIRST_INITIALIZER_P is true if this is the first initializer of the
5170 outermost CONSTRUCTOR node. */
5173 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5174 tsubst_flags_t complain)
5176 tree init = d->cur->value;
5178 if (error_operand_p (init))
5179 return error_mark_node;
5181 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5182 && has_designator_problem (d, complain))
5183 return error_mark_node;
5185 if (TREE_CODE (type) == COMPLEX_TYPE)
5187 /* A complex type can be initialized from one or two initializers,
5188 but braces are not elided. */
5190 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5192 if (CONSTRUCTOR_NELTS (init) > 2)
5194 if (complain & tf_error)
5195 error ("too many initializers for %qT", type);
5197 return error_mark_node;
5200 else if (first_initializer_p && d->cur != d->end)
5202 VEC(constructor_elt, gc) *v = 0;
5203 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5204 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5205 if (has_designator_problem (d, complain))
5206 return error_mark_node;
5208 init = build_constructor (init_list_type_node, v);
5213 /* A non-aggregate type is always initialized with a single
5215 if (!CP_AGGREGATE_TYPE_P (type))
5217 /* It is invalid to initialize a non-aggregate type with a
5218 brace-enclosed initializer before C++0x.
5219 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5220 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5221 a CONSTRUCTOR (with a record type). */
5222 if (TREE_CODE (init) == CONSTRUCTOR
5223 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5225 if (SCALAR_TYPE_P (type))
5227 if (complain & tf_error)
5228 error ("braces around scalar initializer for type %qT", type);
5229 init = error_mark_node;
5232 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5241 All implicit type conversions (clause _conv_) are considered when
5242 initializing the aggregate member with an initializer from an
5243 initializer-list. If the initializer can initialize a member,
5244 the member is initialized. Otherwise, if the member is itself a
5245 non-empty subaggregate, brace elision is assumed and the
5246 initializer is considered for the initialization of the first
5247 member of the subaggregate. */
5248 if (TREE_CODE (init) != CONSTRUCTOR
5249 /* But don't try this for the first initializer, since that would be
5250 looking through the outermost braces; A a2 = { a1 }; is not a
5251 valid aggregate initialization. */
5252 && !first_initializer_p
5253 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5254 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5260 /* [dcl.init.string]
5262 A char array (whether plain char, signed char, or unsigned char)
5263 can be initialized by a string-literal (optionally enclosed in
5264 braces); a wchar_t array can be initialized by a wide
5265 string-literal (optionally enclosed in braces). */
5266 if (TREE_CODE (type) == ARRAY_TYPE
5267 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5269 tree str_init = init;
5271 /* Strip one level of braces if and only if they enclose a single
5272 element (as allowed by [dcl.init.string]). */
5273 if (!first_initializer_p
5274 && TREE_CODE (str_init) == CONSTRUCTOR
5275 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5277 str_init = VEC_index (constructor_elt,
5278 CONSTRUCTOR_ELTS (str_init), 0)->value;
5281 /* If it's a string literal, then it's the initializer for the array
5282 as a whole. Otherwise, continue with normal initialization for
5283 array types (one value per array element). */
5284 if (TREE_CODE (str_init) == STRING_CST)
5286 if (has_designator_problem (d, complain))
5287 return error_mark_node;
5293 /* The following cases are about aggregates. If we are not within a full
5294 initializer already, and there is not a CONSTRUCTOR, it means that there
5295 is a missing set of braces (that is, we are processing the case for
5296 which reshape_init exists). */
5297 if (!first_initializer_p)
5299 if (TREE_CODE (init) == CONSTRUCTOR)
5301 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5302 /* There is no need to reshape pointer-to-member function
5303 initializers, as they are always constructed correctly
5304 by the front end. */
5306 else if (COMPOUND_LITERAL_P (init))
5307 /* For a nested compound literal, there is no need to reshape since
5308 brace elision is not allowed. Even if we decided to allow it,
5309 we should add a call to reshape_init in finish_compound_literal,
5310 before calling digest_init, so changing this code would still
5311 not be necessary. */
5312 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5316 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5317 return reshape_init (type, init, complain);
5321 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5325 /* Dispatch to specialized routines. */
5326 if (CLASS_TYPE_P (type))
5327 return reshape_init_class (type, d, first_initializer_p, complain);
5328 else if (TREE_CODE (type) == ARRAY_TYPE)
5329 return reshape_init_array (type, d, complain);
5330 else if (TREE_CODE (type) == VECTOR_TYPE)
5331 return reshape_init_vector (type, d, complain);
5336 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5337 brace-enclosed aggregate initializer.
5339 INIT is the CONSTRUCTOR containing the list of initializers describing
5340 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5341 It may not presently match the shape of the TYPE; for example:
5343 struct S { int a; int b; };
5344 struct S a[] = { 1, 2, 3, 4 };
5346 Here INIT will hold a VEC of four elements, rather than a
5347 VEC of two elements, each itself a VEC of two elements. This
5348 routine transforms INIT from the former form into the latter. The
5349 revised CONSTRUCTOR node is returned. */
5352 reshape_init (tree type, tree init, tsubst_flags_t complain)
5354 VEC(constructor_elt, gc) *v;
5358 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5360 v = CONSTRUCTOR_ELTS (init);
5362 /* An empty constructor does not need reshaping, and it is always a valid
5364 if (VEC_empty (constructor_elt, v))
5367 /* Recurse on this CONSTRUCTOR. */
5368 d.cur = VEC_index (constructor_elt, v, 0);
5369 d.end = d.cur + VEC_length (constructor_elt, v);
5371 new_init = reshape_init_r (type, &d, true, complain);
5372 if (new_init == error_mark_node)
5373 return error_mark_node;
5375 /* Make sure all the element of the constructor were used. Otherwise,
5376 issue an error about exceeding initializers. */
5379 if (complain & tf_error)
5380 error ("too many initializers for %qT", type);
5382 return error_mark_node;
5388 /* Verify array initializer. Returns true if errors have been reported. */
5391 check_array_initializer (tree decl, tree type, tree init)
5393 tree element_type = TREE_TYPE (type);
5395 /* The array type itself need not be complete, because the
5396 initializer may tell us how many elements are in the array.
5397 But, the elements of the array must be complete. */
5398 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5401 error ("elements of array %q#D have incomplete type", decl);
5403 error ("elements of array %q#T have incomplete type", type);
5406 /* It is not valid to initialize a VLA. */
5408 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5409 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5412 error ("variable-sized object %qD may not be initialized", decl);
5414 error ("variable-sized compound literal");
5420 /* Subroutine of check_initializer; args are passed down from that function.
5421 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5424 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5427 gcc_assert (stmts_are_full_exprs_p ());
5428 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5431 /* Verify INIT (the initializer for DECL), and record the
5432 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5433 grok_reference_init.
5435 If the return value is non-NULL, it is an expression that must be
5436 evaluated dynamically to initialize DECL. */
5439 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5441 tree type = TREE_TYPE (decl);
5442 tree init_code = NULL;
5443 tree extra_init = NULL_TREE;
5446 /* Things that are going to be initialized need to have complete
5448 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5450 if (DECL_HAS_VALUE_EXPR_P (decl))
5452 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5453 it doesn't have storage to be initialized. */
5454 gcc_assert (init == NULL_TREE);
5458 if (type == error_mark_node)
5459 /* We will have already complained. */
5462 if (TREE_CODE (type) == ARRAY_TYPE)
5464 if (check_array_initializer (decl, type, init))
5467 else if (!COMPLETE_TYPE_P (type))
5469 error ("%q#D has incomplete type", decl);
5470 TREE_TYPE (decl) = error_mark_node;
5474 /* There is no way to make a variable-sized class type in GNU C++. */
5475 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5477 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5479 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5480 if (SCALAR_TYPE_P (type))
5484 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5485 init = build_zero_init (type, NULL_TREE, false);
5487 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5489 error ("scalar object %qD requires one element in initializer",
5491 TREE_TYPE (decl) = error_mark_node;
5497 if (TREE_CODE (decl) == CONST_DECL)
5499 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5501 DECL_INITIAL (decl) = init;
5503 gcc_assert (init != NULL_TREE);
5506 else if (!init && DECL_REALLY_EXTERN (decl))
5508 else if (init || type_build_ctor_call (type)
5509 || TREE_CODE (type) == REFERENCE_TYPE)
5511 if (TREE_CODE (type) == REFERENCE_TYPE)
5513 init = grok_reference_init (decl, type, init, flags);
5514 flags |= LOOKUP_ALREADY_DIGESTED;
5517 check_for_uninitialized_const_var (decl);
5518 /* Do not reshape constructors of vectors (they don't need to be
5520 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5522 if (is_std_init_list (type))
5524 init = perform_implicit_conversion (type, init,
5525 tf_warning_or_error);
5526 flags |= LOOKUP_ALREADY_DIGESTED;
5528 else if (TYPE_NON_AGGREGATE_CLASS (type))
5530 /* Don't reshape if the class has constructors. */
5531 if (cxx_dialect == cxx98)
5532 error ("in C++98 %qD must be initialized by constructor, "
5536 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5538 error ("opaque vector types cannot be initialized");
5539 init = error_mark_node;
5543 init = reshape_init (type, init, tf_warning_or_error);
5544 if (SCALAR_TYPE_P (type))
5545 check_narrowing (type, init);
5549 /* If DECL has an array type without a specific bound, deduce the
5550 array size from the initializer. */
5551 maybe_deduce_size_from_array_init (decl, init);
5552 type = TREE_TYPE (decl);
5553 if (type == error_mark_node)
5556 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5557 && !(flags & LOOKUP_ALREADY_DIGESTED)
5558 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5559 && CP_AGGREGATE_TYPE_P (type)))
5561 init_code = build_aggr_init_full_exprs (decl, init, flags);
5563 /* If this is a constexpr initializer, expand_default_init will
5564 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5565 case, pull the initializer back out and pass it down into
5566 store_init_value. */
5567 while (TREE_CODE (init_code) == EXPR_STMT
5568 || TREE_CODE (init_code) == CONVERT_EXPR)
5569 init_code = TREE_OPERAND (init_code, 0);
5570 if (TREE_CODE (init_code) == INIT_EXPR)
5572 init = TREE_OPERAND (init_code, 1);
5573 init_code = NULL_TREE;
5574 /* Don't call digest_init; it's unnecessary and will complain
5575 about aggregate initialization of non-aggregate classes. */
5576 flags |= LOOKUP_ALREADY_DIGESTED;
5578 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5580 /* Declared constexpr, but no suitable initializer; massage
5581 init appropriately so we can pass it into store_init_value
5583 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5584 init = finish_compound_literal (type, init,
5585 tf_warning_or_error);
5586 else if (CLASS_TYPE_P (type)
5587 && (!init || TREE_CODE (init) == TREE_LIST))
5589 init = build_functional_cast (type, init, tf_none);
5590 if (init != error_mark_node)
5591 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5593 init_code = NULL_TREE;
5599 if (init && TREE_CODE (init) != TREE_VEC)
5601 /* In aggregate initialization of a variable, each element
5602 initialization is a full-expression because there is no
5603 enclosing expression. */
5604 gcc_assert (stmts_are_full_exprs_p ());
5606 init_code = store_init_value (decl, init, cleanups, flags);
5608 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5609 && DECL_INITIAL (decl)
5610 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5611 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5612 warning (0, "array %qD initialized by parenthesized string literal %qE",
5613 decl, DECL_INITIAL (decl));
5619 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5620 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5621 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5622 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5625 check_for_uninitialized_const_var (decl);
5628 if (init && init != error_mark_node)
5629 init_code = build2 (INIT_EXPR, type, decl, init);
5632 init_code = add_stmt_to_compound (extra_init, init_code);
5634 if (init_code && DECL_IN_AGGR_P (decl))
5636 static int explained = 0;
5638 if (cxx_dialect < cxx0x)
5639 error ("initializer invalid for static member with constructor");
5641 error ("non-constant in-class initialization invalid for static "
5642 "member %qD", decl);
5645 error ("(an out of class initialization is required)");
5653 /* If DECL is not a local variable, give it RTL. */
5656 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5658 int toplev = toplevel_bindings_p ();
5660 const char *filename;
5662 /* Set the DECL_ASSEMBLER_NAME for the object. */
5665 /* The `register' keyword, when used together with an
5666 asm-specification, indicates that the variable should be
5667 placed in a particular register. */
5668 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5670 set_user_assembler_name (decl, asmspec);
5671 DECL_HARD_REGISTER (decl) = 1;
5675 if (TREE_CODE (decl) == FUNCTION_DECL
5676 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5677 set_builtin_user_assembler_name (decl, asmspec);
5678 set_user_assembler_name (decl, asmspec);
5682 /* Handle non-variables up front. */
5683 if (TREE_CODE (decl) != VAR_DECL)
5685 rest_of_decl_compilation (decl, toplev, at_eof);
5689 /* If we see a class member here, it should be a static data
5691 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5693 gcc_assert (TREE_STATIC (decl));
5694 /* An in-class declaration of a static data member should be
5695 external; it is only a declaration, and not a definition. */
5696 if (init == NULL_TREE)
5697 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5700 /* We don't create any RTL for local variables. */
5701 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5704 /* We defer emission of local statics until the corresponding
5705 DECL_EXPR is expanded. */
5706 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5708 /* We try to defer namespace-scope static constants so that they are
5709 not emitted into the object file unnecessarily. */
5710 filename = input_filename;
5711 if (!DECL_VIRTUAL_P (decl)
5712 && TREE_READONLY (decl)
5713 && DECL_INITIAL (decl) != NULL_TREE
5714 && DECL_INITIAL (decl) != error_mark_node
5716 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5718 && !TREE_PUBLIC (decl))
5720 /* Fool with the linkage of static consts according to #pragma
5722 struct c_fileinfo *finfo = get_fileinfo (filename);
5723 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5725 TREE_PUBLIC (decl) = 1;
5726 DECL_EXTERNAL (decl) = finfo->interface_only;
5731 /* Likewise for template instantiations. */
5732 else if (DECL_LANG_SPECIFIC (decl)
5733 && DECL_IMPLICIT_INSTANTIATION (decl))
5736 /* If we're not deferring, go ahead and assemble the variable. */
5738 rest_of_decl_compilation (decl, toplev, at_eof);
5741 /* walk_tree helper for wrap_temporary_cleanups, below. */
5744 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5746 /* Stop at types or full-expression boundaries. */
5747 if (TYPE_P (*stmt_p)
5748 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5754 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5756 tree guard = (tree)data;
5757 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5759 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5760 /* Tell honor_protect_cleanup_actions to handle this as a separate
5762 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5764 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5770 /* We're initializing a local variable which has a cleanup GUARD. If there
5771 are any temporaries used in the initializer INIT of this variable, we
5772 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5773 variable will be cleaned up properly if one of them throws.
5775 Unfortunately, there's no way to express this properly in terms of
5776 nesting, as the regions for the temporaries overlap the region for the
5777 variable itself; if there are two temporaries, the variable needs to be
5778 the first thing destroyed if either of them throws. However, we only
5779 want to run the variable's cleanup if it actually got constructed. So
5780 we need to guard the temporary cleanups with the variable's cleanup if
5781 they are run on the normal path, but not if they are run on the
5782 exceptional path. We implement this by telling
5783 honor_protect_cleanup_actions to strip the variable cleanup from the
5784 exceptional path. */
5787 wrap_temporary_cleanups (tree init, tree guard)
5789 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5792 /* Generate code to initialize DECL (a local variable). */
5795 initialize_local_var (tree decl, tree init)
5797 tree type = TREE_TYPE (decl);
5801 gcc_assert (TREE_CODE (decl) == VAR_DECL
5802 || TREE_CODE (decl) == RESULT_DECL);
5803 gcc_assert (!TREE_STATIC (decl));
5805 if (DECL_SIZE (decl) == NULL_TREE)
5807 /* If we used it already as memory, it must stay in memory. */
5808 DECL_INITIAL (decl) = NULL_TREE;
5809 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5813 if (type == error_mark_node)
5816 /* Compute and store the initial value. */
5817 already_used = TREE_USED (decl) || TREE_USED (type);
5818 if (TREE_USED (type))
5819 DECL_READ_P (decl) = 1;
5821 /* Generate a cleanup, if necessary. */
5822 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5824 /* Perform the initialization. */
5827 if (TREE_CODE (init) == INIT_EXPR
5828 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5830 /* Stick simple initializers in DECL_INITIAL so that
5831 -Wno-init-self works (c++/34772). */
5832 gcc_assert (TREE_OPERAND (init, 0) == decl);
5833 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5837 int saved_stmts_are_full_exprs_p;
5839 /* If we're only initializing a single object, guard the
5840 destructors of any temporaries used in its initializer with
5841 its destructor. This isn't right for arrays because each
5842 element initialization is a full-expression. */
5843 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5844 wrap_temporary_cleanups (init, cleanup);
5846 gcc_assert (building_stmt_list_p ());
5847 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5848 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5849 finish_expr_stmt (init);
5850 current_stmt_tree ()->stmts_are_full_exprs_p =
5851 saved_stmts_are_full_exprs_p;
5855 /* Set this to 0 so we can tell whether an aggregate which was
5856 initialized was ever used. Don't do this if it has a
5857 destructor, so we don't complain about the 'resource
5858 allocation is initialization' idiom. Now set
5859 attribute((unused)) on types so decls of that type will be
5860 marked used. (see TREE_USED, above.) */
5861 if (TYPE_NEEDS_CONSTRUCTING (type)
5863 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5864 && DECL_NAME (decl))
5865 TREE_USED (decl) = 0;
5866 else if (already_used)
5867 TREE_USED (decl) = 1;
5870 finish_decl_cleanup (decl, cleanup);
5873 /* DECL is a VAR_DECL for a compiler-generated variable with static
5874 storage duration (like a virtual table) whose initializer is a
5875 compile-time constant. Initialize the variable and provide it to the
5879 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5882 gcc_assert (DECL_ARTIFICIAL (decl));
5883 init = build_constructor (TREE_TYPE (decl), v);
5884 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5885 DECL_INITIAL (decl) = init;
5886 DECL_INITIALIZED_P (decl) = 1;
5887 determine_visibility (decl);
5888 layout_var_decl (decl);
5889 maybe_commonize_var (decl);
5890 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5893 /* INIT is the initializer for a variable, as represented by the
5894 parser. Returns true iff INIT is type-dependent. */
5897 type_dependent_init_p (tree init)
5899 if (TREE_CODE (init) == TREE_LIST)
5900 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5901 return any_type_dependent_elements_p (init);
5902 else if (TREE_CODE (init) == CONSTRUCTOR)
5903 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5905 VEC(constructor_elt, gc) *elts;
5909 elts = CONSTRUCTOR_ELTS (init);
5910 nelts = VEC_length (constructor_elt, elts);
5911 for (i = 0; i < nelts; ++i)
5912 if (type_dependent_init_p (VEC_index (constructor_elt,
5917 /* It must be a simple expression, e.g., int i = 3; */
5918 return type_dependent_expression_p (init);
5923 /* INIT is the initializer for a variable, as represented by the
5924 parser. Returns true iff INIT is value-dependent. */
5927 value_dependent_init_p (tree init)
5929 if (TREE_CODE (init) == TREE_LIST)
5930 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5931 return any_value_dependent_elements_p (init);
5932 else if (TREE_CODE (init) == CONSTRUCTOR)
5933 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5935 VEC(constructor_elt, gc) *elts;
5939 elts = CONSTRUCTOR_ELTS (init);
5940 nelts = VEC_length (constructor_elt, elts);
5941 for (i = 0; i < nelts; ++i)
5942 if (value_dependent_init_p (VEC_index (constructor_elt,
5947 /* It must be a simple expression, e.g., int i = 3; */
5948 return value_dependent_expression_p (init);
5953 /* Finish processing of a declaration;
5954 install its line number and initial value.
5955 If the length of an array type is not known before,
5956 it must be determined now, from the initial value, or it is an error.
5958 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5959 true, then INIT is an integral constant expression.
5961 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5962 if the (init) syntax was used. */
5965 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5966 tree asmspec_tree, int flags)
5969 VEC(tree,gc) *cleanups = NULL;
5970 const char *asmspec = NULL;
5971 int was_readonly = 0;
5972 bool var_definition_p = false;
5975 if (decl == error_mark_node)
5980 error ("assignment (not initialization) in declaration");
5984 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5985 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5986 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5988 type = TREE_TYPE (decl);
5989 if (type == error_mark_node)
5992 /* If a name was specified, get the string. */
5993 if (at_namespace_scope_p ())
5994 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5995 if (asmspec_tree && asmspec_tree != error_mark_node)
5996 asmspec = TREE_STRING_POINTER (asmspec_tree);
5998 if (current_class_type
5999 && CP_DECL_CONTEXT (decl) == current_class_type
6000 && TYPE_BEING_DEFINED (current_class_type)
6001 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6002 && (DECL_INITIAL (decl) || init))
6003 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6005 auto_node = type_uses_auto (type);
6009 if (init == NULL_TREE)
6011 error ("declaration of %q#D has no initializer", decl);
6012 TREE_TYPE (decl) = error_mark_node;
6016 if (TREE_CODE (d_init) == TREE_LIST)
6017 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6018 tf_warning_or_error);
6019 d_init = resolve_nondeduced_context (d_init);
6020 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6022 if (type == error_mark_node)
6026 if (!ensure_literal_type_for_constexpr_object (decl))
6027 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6029 if (TREE_CODE (decl) == VAR_DECL
6030 && DECL_CLASS_SCOPE_P (decl)
6031 && DECL_INITIALIZED_IN_CLASS_P (decl))
6032 check_static_variable_definition (decl, type);
6034 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6037 if (init == ridpointers[(int)RID_DELETE])
6039 /* FIXME check this is 1st decl. */
6040 DECL_DELETED_FN (decl) = 1;
6041 DECL_DECLARED_INLINE_P (decl) = 1;
6042 DECL_INITIAL (decl) = error_mark_node;
6043 FOR_EACH_CLONE (clone, decl)
6045 DECL_DELETED_FN (clone) = 1;
6046 DECL_DECLARED_INLINE_P (clone) = 1;
6047 DECL_INITIAL (clone) = error_mark_node;
6051 else if (init == ridpointers[(int)RID_DEFAULT])
6053 if (defaultable_fn_check (decl))
6054 DECL_DEFAULTED_FN (decl) = 1;
6056 DECL_INITIAL (decl) = NULL_TREE;
6060 if (init && TREE_CODE (decl) == VAR_DECL)
6062 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6063 /* If DECL is a reference, then we want to know whether init is a
6064 reference constant; init_const_expr_p as passed tells us whether
6065 it's an rvalue constant. */
6066 if (TREE_CODE (type) == REFERENCE_TYPE)
6067 init_const_expr_p = potential_constant_expression (init);
6068 if (init_const_expr_p)
6070 /* Set these flags now for templates. We'll update the flags in
6071 store_init_value for instantiations. */
6072 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6073 if (decl_maybe_constant_var_p (decl))
6074 TREE_CONSTANT (decl) = 1;
6078 if (processing_template_decl)
6080 bool type_dependent_p;
6082 /* Add this declaration to the statement-tree. */
6083 if (at_function_scope_p ())
6084 add_decl_expr (decl);
6086 type_dependent_p = dependent_type_p (type);
6088 if (check_for_bare_parameter_packs (init))
6091 DECL_INITIAL (decl) = NULL_TREE;
6094 /* Generally, initializers in templates are expanded when the
6095 template is instantiated. But, if DECL is a variable constant
6096 then it can be used in future constant expressions, so its value
6097 must be available. */
6099 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6100 /* We can't do anything if the decl has dependent type. */;
6102 && init_const_expr_p
6103 && !type_dependent_p
6104 && decl_maybe_constant_var_p (decl)
6105 && !type_dependent_init_p (init)
6106 && !value_dependent_init_p (init))
6108 /* This variable seems to be a non-dependent constant, so process
6109 its initializer. If check_initializer returns non-null the
6110 initialization wasn't constant after all. */
6112 cleanups = make_tree_vector ();
6113 init_code = check_initializer (decl, init, flags, &cleanups);
6114 if (init_code == NULL_TREE)
6116 release_tree_vector (cleanups);
6118 else if (!DECL_PRETTY_FUNCTION_P (decl))
6119 /* Deduce array size even if the initializer is dependent. */
6120 maybe_deduce_size_from_array_init (decl, init);
6123 DECL_INITIAL (decl) = init;
6127 /* Just store non-static data member initializers for later. */
6128 if (init && TREE_CODE (decl) == FIELD_DECL)
6129 DECL_INITIAL (decl) = init;
6131 /* Take care of TYPE_DECLs up front. */
6132 if (TREE_CODE (decl) == TYPE_DECL)
6134 if (type != error_mark_node
6135 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6137 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6138 warning (0, "shadowing previous type declaration of %q#D", decl);
6139 set_identifier_type_value (DECL_NAME (decl), decl);
6142 /* If we have installed this as the canonical typedef for this
6143 type, and that type has not been defined yet, delay emitting
6144 the debug information for it, as we will emit it later. */
6145 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6146 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6147 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6149 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6154 /* A reference will be modified here, as it is initialized. */
6155 if (! DECL_EXTERNAL (decl)
6156 && TREE_READONLY (decl)
6157 && TREE_CODE (type) == REFERENCE_TYPE)
6160 TREE_READONLY (decl) = 0;
6163 if (TREE_CODE (decl) == VAR_DECL)
6165 /* Only variables with trivial initialization and destruction can
6166 have thread-local storage. */
6167 if (DECL_THREAD_LOCAL_P (decl)
6168 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6169 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6170 error ("%qD cannot be thread-local because it has non-trivial "
6171 "type %qT", decl, TREE_TYPE (decl));
6172 /* If this is a local variable that will need a mangled name,
6173 register it now. We must do this before processing the
6174 initializer for the variable, since the initialization might
6175 require a guard variable, and since the mangled name of the
6176 guard variable will depend on the mangled name of this
6178 if (DECL_FUNCTION_SCOPE_P (decl)
6179 && TREE_STATIC (decl)
6180 && !DECL_ARTIFICIAL (decl))
6182 push_local_name (decl);
6183 if (DECL_CONSTRUCTOR_P (current_function_decl)
6184 || DECL_DESTRUCTOR_P (current_function_decl))
6185 /* Normally local_decls is populated during GIMPLE lowering,
6186 but [cd]tors are never actually compiled directly. We need
6187 to put statics on the list so we can deal with the label
6188 address extension. */
6189 add_local_decl (cfun, decl);
6192 /* Convert the initializer to the type of DECL, if we have not
6193 already initialized DECL. */
6194 if (!DECL_INITIALIZED_P (decl)
6195 /* If !DECL_EXTERNAL then DECL is being defined. In the
6196 case of a static data member initialized inside the
6197 class-specifier, there can be an initializer even if DECL
6198 is *not* defined. */
6199 && (!DECL_EXTERNAL (decl) || init))
6201 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6204 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6205 /* Allow libjava/prims.cc define primitive classes. */
6206 if (init != NULL_TREE
6207 || jclass == NULL_TREE
6208 || TREE_CODE (jclass) != TYPE_DECL
6209 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6210 || !same_type_ignoring_top_level_qualifiers_p
6211 (type, TREE_TYPE (TREE_TYPE (jclass))))
6212 error ("Java object %qD not allocated with %<new%>", decl);
6215 cleanups = make_tree_vector ();
6216 init = check_initializer (decl, init, flags, &cleanups);
6217 /* Thread-local storage cannot be dynamically initialized. */
6218 if (DECL_THREAD_LOCAL_P (decl) && init)
6220 error ("%qD is thread-local and so cannot be dynamically "
6221 "initialized", decl);
6225 /* Check that the initializer for a static data member was a
6226 constant. Although we check in the parser that the
6227 initializer is an integral constant expression, we do not
6228 simplify division-by-zero at the point at which it
6229 occurs. Therefore, in:
6231 struct S { static const int i = 7 / 0; };
6233 we issue an error at this point. It would
6234 probably be better to forbid division by zero in
6235 integral constant expressions. */
6236 if (DECL_EXTERNAL (decl) && init)
6238 error ("%qD cannot be initialized by a non-constant expression"
6239 " when being declared", decl);
6240 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6248 The memory occupied by any object of static storage
6249 duration is zero-initialized at program startup before
6250 any other initialization takes place.
6252 We cannot create an appropriate initializer until after
6253 the type of DECL is finalized. If DECL_INITIAL is set,
6254 then the DECL is statically initialized, and any
6255 necessary zero-initialization has already been performed. */
6256 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6257 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6258 /*nelts=*/NULL_TREE,
6259 /*static_storage_p=*/true);
6260 /* Remember that the initialization for this variable has
6262 DECL_INITIALIZED_P (decl) = 1;
6263 /* This declaration is the definition of this variable,
6264 unless we are initializing a static data member within
6265 the class specifier. */
6266 if (!DECL_EXTERNAL (decl))
6267 var_definition_p = true;
6269 /* If the variable has an array type, lay out the type, even if
6270 there is no initializer. It is valid to index through the
6271 array, and we must get TYPE_ALIGN set correctly on the array
6273 else if (TREE_CODE (type) == ARRAY_TYPE)
6276 if (TREE_STATIC (decl)
6277 && !at_function_scope_p ()
6278 && current_function_decl == NULL)
6279 /* So decl is a global variable or a static member of a
6280 non local class. Record the types it uses
6281 so that we can decide later to emit debug info for them. */
6282 record_types_used_by_current_var_decl (decl);
6284 else if (TREE_CODE (decl) == FIELD_DECL
6285 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6286 error ("non-static data member %qD has Java class type", decl);
6288 /* Add this declaration to the statement-tree. This needs to happen
6289 after the call to check_initializer so that the DECL_EXPR for a
6290 reference temp is added before the DECL_EXPR for the reference itself. */
6291 if (DECL_FUNCTION_SCOPE_P (decl))
6292 add_decl_expr (decl);
6294 /* Let the middle end know about variables and functions -- but not
6295 static data members in uninstantiated class templates. */
6296 if (TREE_CODE (decl) == VAR_DECL
6297 || TREE_CODE (decl) == FUNCTION_DECL)
6299 if (TREE_CODE (decl) == VAR_DECL)
6301 layout_var_decl (decl);
6302 maybe_commonize_var (decl);
6305 /* This needs to happen after the linkage is set. */
6306 determine_visibility (decl);
6308 if (var_definition_p && TREE_STATIC (decl))
6310 /* If a TREE_READONLY variable needs initialization
6311 at runtime, it is no longer readonly and we need to
6312 avoid MEM_READONLY_P being set on RTL created for it. */
6315 if (TREE_READONLY (decl))
6316 TREE_READONLY (decl) = 0;
6319 else if (was_readonly)
6320 TREE_READONLY (decl) = 1;
6323 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6325 /* Check for abstractness of the type. Notice that there is no
6326 need to strip array types here since the check for those types
6327 is already done within create_array_type_for_decl. */
6328 if (TREE_CODE (type) == FUNCTION_TYPE
6329 || TREE_CODE (type) == METHOD_TYPE)
6330 abstract_virtuals_error (decl, TREE_TYPE (type));
6332 abstract_virtuals_error (decl, type);
6334 if (TREE_TYPE (decl) == error_mark_node)
6335 /* No initialization required. */
6337 else if (TREE_CODE (decl) == FUNCTION_DECL)
6341 if (init == ridpointers[(int)RID_DEFAULT])
6343 /* An out-of-class default definition is defined at
6344 the point where it is explicitly defaulted. */
6345 if (DECL_DELETED_FN (decl))
6346 maybe_explain_implicit_delete (decl);
6347 else if (DECL_INITIAL (decl) == error_mark_node)
6348 synthesize_method (decl);
6351 error ("function %q#D is initialized like a variable", decl);
6353 /* else no initialization required. */
6355 else if (DECL_EXTERNAL (decl)
6356 && ! (DECL_LANG_SPECIFIC (decl)
6357 && DECL_NOT_REALLY_EXTERN (decl)))
6360 DECL_INITIAL (decl) = init;
6362 /* A variable definition. */
6363 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6364 /* Initialize the local variable. */
6365 initialize_local_var (decl, init);
6367 /* If a variable is defined, and then a subsequent
6368 definition with external linkage is encountered, we will
6369 get here twice for the same variable. We want to avoid
6370 calling expand_static_init more than once. For variables
6371 that are not static data members, we can call
6372 expand_static_init only when we actually process the
6373 initializer. It is not legal to redeclare a static data
6374 member, so this issue does not arise in that case. */
6375 else if (var_definition_p && TREE_STATIC (decl))
6376 expand_static_init (decl, init);
6379 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6380 reference, insert it in the statement-tree now. */
6384 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6385 push_cleanup (decl, t, false);
6386 release_tree_vector (cleanups);
6390 TREE_READONLY (decl) = 1;
6392 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6395 /* Returns a declaration for a VAR_DECL as if:
6397 extern "C" TYPE NAME;
6399 had been seen. Used to create compiler-generated global
6403 declare_global_var (tree name, tree type)
6407 push_to_top_level ();
6408 decl = build_decl (input_location, VAR_DECL, name, type);
6409 TREE_PUBLIC (decl) = 1;
6410 DECL_EXTERNAL (decl) = 1;
6411 DECL_ARTIFICIAL (decl) = 1;
6412 /* If the user has explicitly declared this variable (perhaps
6413 because the code we are compiling is part of a low-level runtime
6414 library), then it is possible that our declaration will be merged
6415 with theirs by pushdecl. */
6416 decl = pushdecl (decl);
6417 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6418 pop_from_top_level ();
6423 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6424 if "__cxa_atexit" is not being used) corresponding to the function
6425 to be called when the program exits. */
6428 get_atexit_fn_ptr_type (void)
6432 if (!atexit_fn_ptr_type_node)
6435 if (flag_use_cxa_atexit
6436 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6437 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6438 arg_type = ptr_type_node;
6440 /* The parameter to "atexit" is "void (*)(void)". */
6441 arg_type = NULL_TREE;
6443 fn_type = build_function_type_list (void_type_node,
6444 arg_type, NULL_TREE);
6445 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6448 return atexit_fn_ptr_type_node;
6451 /* Returns a pointer to the `atexit' function. Note that if
6452 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6453 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6456 get_atexit_node (void)
6462 bool use_aeabi_atexit;
6467 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6469 /* The declaration for `__cxa_atexit' is:
6471 int __cxa_atexit (void (*)(void *), void *, void *)
6473 We build up the argument types and then the function type
6475 tree argtype0, argtype1, argtype2;
6477 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6478 /* First, build the pointer-to-function type for the first
6480 fn_ptr_type = get_atexit_fn_ptr_type ();
6481 /* Then, build the rest of the argument types. */
6482 argtype2 = ptr_type_node;
6483 if (use_aeabi_atexit)
6485 argtype1 = fn_ptr_type;
6486 argtype0 = ptr_type_node;
6490 argtype1 = ptr_type_node;
6491 argtype0 = fn_ptr_type;
6493 /* And the final __cxa_atexit type. */
6494 fn_type = build_function_type_list (integer_type_node,
6495 argtype0, argtype1, argtype2,
6497 fn_ptr_type = build_pointer_type (fn_type);
6498 if (use_aeabi_atexit)
6499 name = "__aeabi_atexit";
6501 name = "__cxa_atexit";
6505 /* The declaration for `atexit' is:
6507 int atexit (void (*)());
6509 We build up the argument types and then the function type
6511 fn_ptr_type = get_atexit_fn_ptr_type ();
6512 /* Build the final atexit type. */
6513 fn_type = build_function_type_list (integer_type_node,
6514 fn_ptr_type, NULL_TREE);
6518 /* Now, build the function declaration. */
6519 push_lang_context (lang_name_c);
6520 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6521 mark_used (atexit_fndecl);
6522 pop_lang_context ();
6523 atexit_node = decay_conversion (atexit_fndecl);
6528 /* Returns the __dso_handle VAR_DECL. */
6531 get_dso_handle_node (void)
6533 if (dso_handle_node)
6534 return dso_handle_node;
6536 /* Declare the variable. */
6537 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6540 #ifdef HAVE_GAS_HIDDEN
6541 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6542 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6545 return dso_handle_node;
6548 /* Begin a new function with internal linkage whose job will be simply
6549 to destroy some particular variable. */
6551 static GTY(()) int start_cleanup_cnt;
6554 start_cleanup_fn (void)
6559 bool use_cxa_atexit = flag_use_cxa_atexit
6560 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6562 push_to_top_level ();
6564 /* No need to mangle this. */
6565 push_lang_context (lang_name_c);
6567 /* Build the name of the function. */
6568 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6569 /* Build the function declaration. */
6570 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6571 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6572 /* It's a function with internal linkage, generated by the
6574 TREE_PUBLIC (fndecl) = 0;
6575 DECL_ARTIFICIAL (fndecl) = 1;
6576 /* Make the function `inline' so that it is only emitted if it is
6577 actually needed. It is unlikely that it will be inlined, since
6578 it is only called via a function pointer, but we avoid unnecessary
6579 emissions this way. */
6580 DECL_DECLARED_INLINE_P (fndecl) = 1;
6581 DECL_INTERFACE_KNOWN (fndecl) = 1;
6582 /* Build the parameter. */
6587 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6588 DECL_CONTEXT (parmdecl) = fndecl;
6589 TREE_USED (parmdecl) = 1;
6590 DECL_READ_P (parmdecl) = 1;
6591 DECL_ARGUMENTS (fndecl) = parmdecl;
6595 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6597 pop_lang_context ();
6599 return current_function_decl;
6602 /* Finish the cleanup function begun by start_cleanup_fn. */
6605 end_cleanup_fn (void)
6607 expand_or_defer_fn (finish_function (0));
6609 pop_from_top_level ();
6612 /* Generate code to handle the destruction of DECL, an object with
6613 static storage duration. */
6616 register_dtor_fn (tree decl)
6623 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6625 type = TREE_TYPE (decl);
6626 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6627 return void_zero_node;
6629 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6630 a class object, we can just pass the destructor to
6631 "__cxa_atexit"; we don't have to build a temporary function to do
6633 use_dtor = (flag_use_cxa_atexit
6634 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6635 && CLASS_TYPE_P (type));
6640 /* Find the destructor. */
6641 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6642 gcc_assert (idx >= 0);
6643 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6644 /* Make sure it is accessible. */
6645 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6649 /* Call build_cleanup before we enter the anonymous function so
6650 that any access checks will be done relative to the current
6651 scope, rather than the scope of the anonymous function. */
6652 build_cleanup (decl);
6654 /* Now start the function. */
6655 cleanup = start_cleanup_fn ();
6657 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6658 to the original function, rather than the anonymous one. That
6659 will make the back end think that nested functions are in use,
6660 which causes confusion. */
6661 push_deferring_access_checks (dk_no_check);
6662 fcall = build_cleanup (decl);
6663 pop_deferring_access_checks ();
6665 /* Create the body of the anonymous function. */
6666 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6667 finish_expr_stmt (fcall);
6668 finish_compound_stmt (compound_stmt);
6672 /* Call atexit with the cleanup function. */
6673 mark_used (cleanup);
6674 cleanup = build_address (cleanup);
6675 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6681 /* We must convert CLEANUP to the type that "__cxa_atexit"
6683 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6684 /* "__cxa_atexit" will pass the address of DECL to the
6685 cleanup function. */
6687 addr = build_address (decl);
6688 /* The declared type of the parameter to "__cxa_atexit" is
6689 "void *". For plain "T*", we could just let the
6690 machinery in cp_build_function_call convert it -- but if the
6691 type is "cv-qualified T *", then we need to convert it
6692 before passing it in, to avoid spurious errors. */
6693 addr = build_nop (ptr_type_node, addr);
6696 /* Since the cleanup functions we build ignore the address
6697 they're given, there's no reason to pass the actual address
6698 in, and, in general, it's cheaper to pass NULL than any
6700 addr = null_pointer_node;
6701 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6702 tf_warning_or_error);
6703 if (targetm.cxx.use_aeabi_atexit ())
6716 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6717 arg0, arg1, arg2, NULL_TREE);
6720 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6721 is its initializer. Generate code to handle the construction
6722 and destruction of DECL. */
6725 expand_static_init (tree decl, tree init)
6727 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6728 gcc_assert (TREE_STATIC (decl));
6730 /* Some variables require no dynamic initialization. */
6732 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6735 if (DECL_FUNCTION_SCOPE_P (decl))
6737 /* Emit code to perform this initialization but once. */
6738 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6739 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6740 tree guard, guard_addr;
6743 /* Emit code to perform this initialization but once. This code
6746 static <type> guard;
6747 if (!guard.first_byte) {
6748 if (__cxa_guard_acquire (&guard)) {
6751 // Do initialization.
6752 flag = true; __cxa_guard_release (&guard);
6753 // Register variable for destruction at end of program.
6755 if (!flag) __cxa_guard_abort (&guard);
6759 Note that the `flag' variable is only set to 1 *after* the
6760 initialization is complete. This ensures that an exception,
6761 thrown during the construction, will cause the variable to
6762 reinitialized when we pass through this code again, as per:
6766 If the initialization exits by throwing an exception, the
6767 initialization is not complete, so it will be tried again
6768 the next time control enters the declaration.
6770 This process should be thread-safe, too; multiple threads
6771 should not be able to initialize the variable more than
6774 /* Create the guard variable. */
6775 guard = get_guard (decl);
6777 /* This optimization isn't safe on targets with relaxed memory
6778 consistency. On such targets we force synchronization in
6779 __cxa_guard_acquire. */
6780 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6782 /* Begin the conditional initialization. */
6783 if_stmt = begin_if_stmt ();
6784 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6785 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6788 if (flag_threadsafe_statics)
6790 tree vfntype = NULL_TREE;
6791 tree acquire_name, release_name, abort_name;
6792 tree acquire_fn, release_fn, abort_fn;
6793 guard_addr = build_address (guard);
6795 acquire_name = get_identifier ("__cxa_guard_acquire");
6796 release_name = get_identifier ("__cxa_guard_release");
6797 abort_name = get_identifier ("__cxa_guard_abort");
6798 acquire_fn = identifier_global_value (acquire_name);
6799 release_fn = identifier_global_value (release_name);
6800 abort_fn = identifier_global_value (abort_name);
6802 acquire_fn = push_library_fn
6803 (acquire_name, build_function_type_list (integer_type_node,
6804 TREE_TYPE (guard_addr),
6807 if (!release_fn || !abort_fn)
6808 vfntype = build_function_type_list (void_type_node,
6809 TREE_TYPE (guard_addr),
6812 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6814 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6816 inner_if_stmt = begin_if_stmt ();
6817 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6820 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6821 begin = get_target_expr (boolean_false_node);
6822 flag = TARGET_EXPR_SLOT (begin);
6824 TARGET_EXPR_CLEANUP (begin)
6825 = build3 (COND_EXPR, void_type_node, flag,
6827 build_call_n (abort_fn, 1, guard_addr));
6828 CLEANUP_EH_ONLY (begin) = 1;
6830 /* Do the initialization itself. */
6831 init = add_stmt_to_compound (begin, init);
6832 init = add_stmt_to_compound
6833 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6834 init = add_stmt_to_compound
6835 (init, build_call_n (release_fn, 1, guard_addr));
6838 init = add_stmt_to_compound (init, set_guard (guard));
6840 /* Use atexit to register a function for destroying this static
6842 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6844 finish_expr_stmt (init);
6846 if (flag_threadsafe_statics)
6848 finish_compound_stmt (inner_then_clause);
6849 finish_then_clause (inner_if_stmt);
6850 finish_if_stmt (inner_if_stmt);
6853 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6855 finish_compound_stmt (then_clause);
6856 finish_then_clause (if_stmt);
6857 finish_if_stmt (if_stmt);
6861 static_aggregates = tree_cons (init, decl, static_aggregates);
6865 /* Make TYPE a complete type based on INITIAL_VALUE.
6866 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6867 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6868 3 if the initializer list is empty (in pedantic mode). */
6871 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6874 tree type, elt_type;
6878 unsigned HOST_WIDE_INT i;
6881 /* An array of character type can be initialized from a
6882 brace-enclosed string constant.
6884 FIXME: this code is duplicated from reshape_init. Probably
6885 we should just call reshape_init here? */
6886 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6887 && TREE_CODE (initial_value) == CONSTRUCTOR
6888 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6890 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6891 tree value = VEC_index (constructor_elt, v, 0)->value;
6893 if (TREE_CODE (value) == STRING_CST
6894 && VEC_length (constructor_elt, v) == 1)
6895 initial_value = value;
6898 /* If any of the elements are parameter packs, we can't actually
6899 complete this type now because the array size is dependent. */
6900 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6902 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6905 if (PACK_EXPANSION_P (value))
6911 failure = complete_array_type (ptype, initial_value, do_default);
6913 /* We can create the array before the element type is complete, which
6914 means that we didn't have these two bits set in the original type
6915 either. In completing the type, we are expected to propagate these
6916 bits. See also complete_type which does the same thing for arrays
6919 if (TYPE_DOMAIN (type))
6921 elt_type = TREE_TYPE (type);
6922 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6923 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6924 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6930 /* As above, but either give an error or reject zero-size arrays, depending
6934 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6935 bool do_default, tsubst_flags_t complain)
6938 bool sfinae = !(complain & tf_error);
6939 /* In SFINAE context we can't be lenient about zero-size arrays. */
6942 failure = cp_complete_array_type (ptype, initial_value, do_default);
6948 /* Not an error. */;
6949 else if (failure == 1)
6950 error ("initializer fails to determine size of %qT", *ptype);
6951 else if (failure == 2)
6954 error ("array size missing in %qT", *ptype);
6956 else if (failure == 3)
6957 error ("zero-size array %qT", *ptype);
6958 *ptype = error_mark_node;
6963 /* Return zero if something is declared to be a member of type
6964 CTYPE when in the context of CUR_TYPE. STRING is the error
6965 message to print in that case. Otherwise, quietly return 1. */
6968 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6970 if (ctype && ctype != cur_type)
6972 if (flags == DTOR_FLAG)
6973 error ("destructor for alien class %qT cannot be a member", ctype);
6975 error ("constructor for alien class %qT cannot be a member", ctype);
6981 /* Subroutine of `grokdeclarator'. */
6983 /* Generate errors possibly applicable for a given set of specifiers.
6984 This is for ARM $7.1.2. */
6987 bad_specifiers (tree object,
6988 enum bad_spec_place type,
6999 error ("%qD declared as a %<virtual%> variable", object);
7001 error ("%qD declared as an %<inline%> variable", object);
7003 error ("%<const%> and %<volatile%> function specifiers on "
7004 "%qD invalid in variable declaration", object);
7008 error ("%qD declared as a %<virtual%> parameter", object);
7010 error ("%qD declared as an %<inline%> parameter", object);
7012 error ("%<const%> and %<volatile%> function specifiers on "
7013 "%qD invalid in parameter declaration", object);
7017 error ("%qD declared as a %<virtual%> type", object);
7019 error ("%qD declared as an %<inline%> type", object);
7021 error ("%<const%> and %<volatile%> function specifiers on "
7022 "%qD invalid in type declaration", object);
7026 error ("%qD declared as a %<virtual%> field", object);
7028 error ("%qD declared as an %<inline%> field", object);
7030 error ("%<const%> and %<volatile%> function specifiers on "
7031 "%qD invalid in field declaration", object);
7037 error ("%q+D declared as a friend", object);
7039 && (TREE_CODE (object) == TYPE_DECL
7040 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7041 && !TYPE_REFFN_P (TREE_TYPE (object))
7042 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7043 error ("%q+D declared with an exception specification", object);
7046 /* DECL is a member function or static data member and is presently
7047 being defined. Check that the definition is taking place in a
7051 check_class_member_definition_namespace (tree decl)
7053 /* These checks only apply to member functions and static data
7055 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7056 || TREE_CODE (decl) == VAR_DECL);
7057 /* We check for problems with specializations in pt.c in
7058 check_specialization_namespace, where we can issue better
7060 if (processing_specialization)
7062 /* There are no restrictions on the placement of
7063 explicit instantiations. */
7064 if (processing_explicit_instantiation)
7068 A member function definition that appears outside of the
7069 class definition shall appear in a namespace scope enclosing
7070 the class definition.
7074 The definition for a static data member shall appear in a
7075 namespace scope enclosing the member's class definition. */
7076 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7077 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7078 decl, DECL_CONTEXT (decl));
7081 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7082 METHOD_TYPE for a non-static member function; QUALS are the
7083 cv-qualifiers that apply to the function. */
7086 build_this_parm (tree type, cp_cv_quals quals)
7091 cp_cv_quals this_quals;
7093 if (CLASS_TYPE_P (type))
7096 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7097 this_type = build_pointer_type (this_type);
7100 this_type = type_of_this_parm (type);
7101 /* The `this' parameter is implicitly `const'; it cannot be
7103 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7104 qual_type = cp_build_qualified_type (this_type, this_quals);
7105 parm = build_artificial_parm (this_identifier, qual_type);
7106 cp_apply_type_quals_to_decl (this_quals, parm);
7110 /* DECL is a static member function. Complain if it was declared
7111 with function-cv-quals. */
7114 check_static_quals (tree decl, cp_cv_quals quals)
7116 if (quals != TYPE_UNQUALIFIED)
7117 error ("static member function %q#D declared with type qualifiers",
7121 /* CTYPE is class type, or null if non-class.
7122 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7124 DECLARATOR is the function's name.
7125 PARMS is a chain of PARM_DECLs for the function.
7126 VIRTUALP is truthvalue of whether the function is virtual or not.
7127 FLAGS are to be passed through to `grokclassfn'.
7128 QUALS are qualifiers indicating whether the function is `const'
7130 RAISES is a list of exceptions that this function can raise.
7131 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7132 not look, and -1 if we should not call `grokclassfn' at all.
7134 SFK is the kind of special function (if any) for the new function.
7136 Returns `NULL_TREE' if something goes wrong, after issuing
7137 applicable error messages. */
7140 grokfndecl (tree ctype,
7144 tree orig_declarator,
7146 enum overload_flags flags,
7153 special_function_kind sfk,
7158 location_t location)
7161 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7165 type = build_exception_variant (type, raises);
7167 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7169 /* If we have an explicit location, use it, otherwise use whatever
7170 build_lang_decl used (probably input_location). */
7171 if (location != UNKNOWN_LOCATION)
7172 DECL_SOURCE_LOCATION (decl) = location;
7174 if (TREE_CODE (type) == METHOD_TYPE)
7177 parm = build_this_parm (type, quals);
7178 DECL_CHAIN (parm) = parms;
7181 DECL_ARGUMENTS (decl) = parms;
7182 for (t = parms; t; t = DECL_CHAIN (t))
7183 DECL_CONTEXT (t) = decl;
7184 /* Propagate volatile out from type to decl. */
7185 if (TYPE_VOLATILE (type))
7186 TREE_THIS_VOLATILE (decl) = 1;
7188 /* Setup decl according to sfk. */
7191 case sfk_constructor:
7192 case sfk_copy_constructor:
7193 case sfk_move_constructor:
7194 DECL_CONSTRUCTOR_P (decl) = 1;
7196 case sfk_destructor:
7197 DECL_DESTRUCTOR_P (decl) = 1;
7203 /* If pointers to member functions use the least significant bit to
7204 indicate whether a function is virtual, ensure a pointer
7205 to this function will have that bit clear. */
7206 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7207 && TREE_CODE (type) == METHOD_TYPE
7208 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7209 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7212 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7216 ("defining explicit specialization %qD in friend declaration",
7220 tree fns = TREE_OPERAND (orig_declarator, 0);
7221 tree args = TREE_OPERAND (orig_declarator, 1);
7223 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7225 /* Something like `template <class T> friend void f<T>()'. */
7226 error ("invalid use of template-id %qD in declaration "
7227 "of primary template",
7233 /* A friend declaration of the form friend void f<>(). Record
7234 the information in the TEMPLATE_ID_EXPR. */
7235 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7237 if (TREE_CODE (fns) == COMPONENT_REF)
7239 /* Due to bison parser ickiness, we will have already looked
7240 up an operator_name or PFUNCNAME within the current class
7241 (see template_id in parse.y). If the current class contains
7242 such a name, we'll get a COMPONENT_REF here. Undo that. */
7244 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7245 == current_class_type);
7246 fns = TREE_OPERAND (fns, 1);
7248 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7249 || TREE_CODE (fns) == OVERLOAD);
7250 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7252 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7253 if (TREE_PURPOSE (t)
7254 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7256 error ("default arguments are not allowed in declaration "
7257 "of friend template specialization %qD",
7264 error ("%<inline%> is not allowed in declaration of friend "
7265 "template specialization %qD",
7272 /* If this decl has namespace scope, set that up. */
7274 set_decl_namespace (decl, in_namespace, friendp);
7276 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7278 /* `main' and builtins have implicit 'C' linkage. */
7279 if ((MAIN_NAME_P (declarator)
7280 || (IDENTIFIER_LENGTH (declarator) > 10
7281 && IDENTIFIER_POINTER (declarator)[0] == '_'
7282 && IDENTIFIER_POINTER (declarator)[1] == '_'
7283 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7284 && current_lang_name == lang_name_cplusplus
7285 && ctype == NULL_TREE
7286 && DECL_FILE_SCOPE_P (decl))
7287 SET_DECL_LANGUAGE (decl, lang_c);
7289 /* Should probably propagate const out from type to decl I bet (mrs). */
7292 DECL_STATIC_FUNCTION_P (decl) = 1;
7293 DECL_CONTEXT (decl) = ctype;
7298 DECL_CONTEXT (decl) = ctype;
7300 check_class_member_definition_namespace (decl);
7303 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7305 if (processing_template_decl)
7306 error ("cannot declare %<::main%> to be a template");
7308 error ("cannot declare %<::main%> to be inline");
7310 error ("cannot declare %<::main%> to be static");
7315 /* Members of anonymous types and local classes have no linkage; make
7316 them internal. If a typedef is made later, this will be changed. */
7317 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7318 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7321 if (publicp && cxx_dialect == cxx98)
7323 /* [basic.link]: A name with no linkage (notably, the name of a class
7324 or enumeration declared in a local scope) shall not be used to
7325 declare an entity with linkage.
7327 DR 757 relaxes this restriction for C++0x. */
7328 t = no_linkage_check (TREE_TYPE (decl),
7329 /*relaxed_p=*/false);
7332 if (TYPE_ANONYMOUS_P (t))
7334 if (DECL_EXTERN_C_P (decl))
7335 /* Allow this; it's pretty common in C. */;
7338 permerror (input_location, "anonymous type with no linkage "
7339 "used to declare function %q#D with linkage",
7341 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7342 permerror (input_location, "%q+#D does not refer to the unqualified "
7343 "type, so it is not used for linkage",
7348 permerror (input_location, "type %qT with no linkage used to "
7349 "declare function %q#D with linkage", t, decl);
7353 TREE_PUBLIC (decl) = publicp;
7356 DECL_INTERFACE_KNOWN (decl) = 1;
7357 DECL_NOT_REALLY_EXTERN (decl) = 1;
7360 /* If the declaration was declared inline, mark it as such. */
7362 DECL_DECLARED_INLINE_P (decl) = 1;
7364 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7366 DECL_EXTERNAL (decl) = 1;
7367 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7370 ? G_("static member function %qD cannot have cv-qualifier")
7371 : G_("non-member function %qD cannot have cv-qualifier"),
7373 quals = TYPE_UNQUALIFIED;
7376 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7377 && !grok_op_properties (decl, /*complain=*/true))
7379 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7381 bool long_long_unsigned_p;
7383 const char *suffix = NULL;
7384 /* [over.literal]/6: Literal operators shall not have C linkage. */
7385 if (DECL_LANGUAGE (decl) == lang_c)
7387 error ("literal operator with C linkage");
7391 if (DECL_NAMESPACE_SCOPE_P (decl))
7393 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7396 error ("%qD has invalid argument list", decl);
7400 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7401 if (long_long_unsigned_p)
7403 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7404 warning (0, "integer suffix %<%s%>"
7405 " shadowed by implementation", suffix);
7407 else if (long_double_p)
7409 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7410 warning (0, "floating point suffix %<%s%>"
7411 " shadowed by implementation", suffix);
7416 error ("%qD must be a non-member function", decl);
7422 /* Make the init_value nonzero so pushdecl knows this is not
7423 tentative. error_mark_node is replaced later with the BLOCK. */
7424 DECL_INITIAL (decl) = error_mark_node;
7426 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7427 TREE_NOTHROW (decl) = 1;
7429 /* Caller will do the rest of this. */
7433 if (ctype != NULL_TREE)
7434 grokclassfn (ctype, decl, flags);
7436 decl = check_explicit_specialization (orig_declarator, decl,
7439 4 * (friendp != 0));
7440 if (decl == error_mark_node)
7443 if (DECL_STATIC_FUNCTION_P (decl))
7444 check_static_quals (decl, quals);
7448 cplus_decl_attributes (&decl, *attrlist, 0);
7449 *attrlist = NULL_TREE;
7452 /* Check main's type after attributes have been applied. */
7453 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7455 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7458 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7460 error ("%<::main%> must return %<int%>");
7461 newtype = build_function_type (integer_type_node, oldtypeargs);
7462 TREE_TYPE (decl) = newtype;
7465 check_main_parameter_types (decl);
7468 if (ctype != NULL_TREE
7469 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7472 tree old_decl = check_classfn (ctype, decl,
7473 (processing_template_decl
7474 > template_class_depth (ctype))
7475 ? current_template_parms
7478 if (old_decl == error_mark_node)
7486 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7487 /* Because grokfndecl is always supposed to return a
7488 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7489 here. We depend on our callers to figure out that its
7490 really a template that's being returned. */
7491 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7493 if (DECL_STATIC_FUNCTION_P (old_decl)
7494 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7496 /* Remove the `this' parm added by grokclassfn. */
7497 revert_static_member_fn (decl);
7498 check_static_quals (decl, quals);
7500 if (DECL_ARTIFICIAL (old_decl))
7502 error ("definition of implicitly-declared %qD", old_decl);
7505 else if (DECL_DEFAULTED_FN (old_decl))
7507 error ("definition of explicitly-defaulted %q+D", decl);
7508 error ("%q+#D explicitly defaulted here", old_decl);
7512 /* Since we've smashed OLD_DECL to its
7513 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7514 if (TREE_CODE (decl) == TEMPLATE_DECL)
7515 decl = DECL_TEMPLATE_RESULT (decl);
7517 /* Attempt to merge the declarations. This can fail, in
7518 the case of some invalid specialization declarations. */
7519 pushed_scope = push_scope (ctype);
7520 ok = duplicate_decls (decl, old_decl, friendp);
7522 pop_scope (pushed_scope);
7525 error ("no %q#D member function declared in class %qT",
7533 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7536 if (ctype == NULL_TREE || check)
7540 DECL_VIRTUAL_P (decl) = 1;
7545 /* decl is a FUNCTION_DECL.
7546 specifiers are the parsed virt-specifiers.
7548 Set flags to reflect the virt-specifiers.
7553 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7555 if (decl == NULL_TREE)
7557 if (specifiers & VIRT_SPEC_OVERRIDE)
7558 DECL_OVERRIDE_P (decl) = 1;
7559 if (specifiers & VIRT_SPEC_FINAL)
7560 DECL_FINAL_P (decl) = 1;
7564 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7565 the linkage that DECL will receive in the object file. */
7568 set_linkage_for_static_data_member (tree decl)
7570 /* A static data member always has static storage duration and
7571 external linkage. Note that static data members are forbidden in
7572 local classes -- the only situation in which a class has
7573 non-external linkage. */
7574 TREE_PUBLIC (decl) = 1;
7575 TREE_STATIC (decl) = 1;
7576 /* For non-template classes, static data members are always put
7577 out in exactly those files where they are defined, just as
7578 with ordinary namespace-scope variables. */
7579 if (!processing_template_decl)
7580 DECL_INTERFACE_KNOWN (decl) = 1;
7583 /* Create a VAR_DECL named NAME with the indicated TYPE.
7585 If SCOPE is non-NULL, it is the class type or namespace containing
7586 the variable. If SCOPE is NULL, the variable should is created in
7587 the innermost enclosings scope. */
7590 grokvardecl (tree type,
7592 const cp_decl_specifier_seq *declspecs,
7598 tree explicit_scope;
7600 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7602 /* Compute the scope in which to place the variable, but remember
7603 whether or not that scope was explicitly specified by the user. */
7604 explicit_scope = scope;
7607 /* An explicit "extern" specifier indicates a namespace-scope
7609 if (declspecs->storage_class == sc_extern)
7610 scope = current_decl_namespace ();
7611 else if (!at_function_scope_p ())
7612 scope = current_scope ();
7616 && (/* If the variable is a namespace-scope variable declared in a
7617 template, we need DECL_LANG_SPECIFIC. */
7618 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7619 /* Similarly for namespace-scope variables with language linkage
7621 || (TREE_CODE (scope) == NAMESPACE_DECL
7622 && current_lang_name != lang_name_cplusplus)
7623 /* Similarly for static data members. */
7625 decl = build_lang_decl (VAR_DECL, name, type);
7627 decl = build_decl (input_location, VAR_DECL, name, type);
7629 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7630 set_decl_namespace (decl, explicit_scope, 0);
7632 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7634 if (declspecs->storage_class == sc_extern)
7636 DECL_THIS_EXTERN (decl) = 1;
7637 DECL_EXTERNAL (decl) = !initialized;
7640 if (DECL_CLASS_SCOPE_P (decl))
7642 set_linkage_for_static_data_member (decl);
7643 /* This function is only called with out-of-class definitions. */
7644 DECL_EXTERNAL (decl) = 0;
7645 check_class_member_definition_namespace (decl);
7647 /* At top level, either `static' or no s.c. makes a definition
7648 (perhaps tentative), and absence of `static' makes it public. */
7649 else if (toplevel_bindings_p ())
7651 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7652 && (DECL_THIS_EXTERN (decl) || ! constp));
7653 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7655 /* Not at top level, only `static' makes a static definition. */
7658 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7659 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7662 if (declspecs->specs[(int)ds_thread])
7663 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7665 /* If the type of the decl has no linkage, make sure that we'll
7666 notice that in mark_used. */
7667 if (cxx_dialect > cxx98
7668 && decl_linkage (decl) != lk_none
7669 && DECL_LANG_SPECIFIC (decl) == NULL
7670 && !DECL_EXTERN_C_P (decl)
7671 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7672 retrofit_lang_decl (decl);
7674 if (TREE_PUBLIC (decl))
7676 /* [basic.link]: A name with no linkage (notably, the name of a class
7677 or enumeration declared in a local scope) shall not be used to
7678 declare an entity with linkage.
7680 DR 757 relaxes this restriction for C++0x. */
7681 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7682 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7685 if (TYPE_ANONYMOUS_P (t))
7687 if (DECL_EXTERN_C_P (decl))
7688 /* Allow this; it's pretty common in C. */
7692 /* DRs 132, 319 and 389 seem to indicate types with
7693 no linkage can only be used to declare extern "C"
7694 entities. Since it's not always an error in the
7695 ISO C++ 90 Standard, we only issue a warning. */
7696 warning (0, "anonymous type with no linkage used to declare "
7697 "variable %q#D with linkage", decl);
7698 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7699 warning (0, "%q+#D does not refer to the unqualified "
7700 "type, so it is not used for linkage",
7705 warning (0, "type %qT with no linkage used to declare variable "
7706 "%q#D with linkage", t, decl);
7710 DECL_INTERFACE_KNOWN (decl) = 1;
7715 /* Create and return a canonical pointer to member function type, for
7716 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7719 build_ptrmemfunc_type (tree type)
7723 tree unqualified_variant = NULL_TREE;
7725 if (type == error_mark_node)
7728 /* If a canonical type already exists for this type, use it. We use
7729 this method instead of type_hash_canon, because it only does a
7730 simple equality check on the list of field members. */
7732 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7735 /* Make sure that we always have the unqualified pointer-to-member
7737 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7739 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7741 t = make_class_type (RECORD_TYPE);
7742 xref_basetypes (t, NULL_TREE);
7744 /* Let the front end know this is a pointer to member function... */
7745 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7746 /* ... and not really a class type. */
7747 SET_CLASS_TYPE_P (t, 0);
7749 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7752 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7754 DECL_CHAIN (field) = fields;
7757 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7759 /* Zap out the name so that the back end will give us the debugging
7760 information for this anonymous RECORD_TYPE. */
7761 TYPE_NAME (t) = NULL_TREE;
7763 /* If this is not the unqualified form of this pointer-to-member
7764 type, set the TYPE_MAIN_VARIANT for this type to be the
7765 unqualified type. Since they are actually RECORD_TYPEs that are
7766 not variants of each other, we must do this manually.
7767 As we just built a new type there is no need to do yet another copy. */
7768 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7770 int type_quals = cp_type_quals (type);
7771 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7772 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7773 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7774 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7775 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7776 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7777 TREE_TYPE (TYPE_BINFO (t)) = t;
7780 /* Cache this pointer-to-member type so that we can find it again
7782 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7784 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7785 SET_TYPE_STRUCTURAL_EQUALITY (t);
7786 else if (TYPE_CANONICAL (type) != type)
7787 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7792 /* Create and return a pointer to data member type. */
7795 build_ptrmem_type (tree class_type, tree member_type)
7797 if (TREE_CODE (member_type) == METHOD_TYPE)
7799 cp_cv_quals quals = type_memfn_quals (member_type);
7800 member_type = build_memfn_type (member_type, class_type, quals);
7801 return build_ptrmemfunc_type (build_pointer_type (member_type));
7805 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7806 return build_offset_type (class_type, member_type);
7810 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7811 Check to see that the definition is valid. Issue appropriate error
7812 messages. Return 1 if the definition is particularly bad, or 0
7816 check_static_variable_definition (tree decl, tree type)
7818 /* Can't check yet if we don't know the type. */
7819 if (dependent_type_p (type))
7821 /* If DECL is declared constexpr, we'll do the appropriate checks
7822 in check_initializer. */
7823 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7825 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7827 if (!COMPLETE_TYPE_P (type))
7828 error ("in-class initialization of static data member %q#D of "
7829 "incomplete type", decl);
7830 else if (literal_type_p (type))
7831 permerror (input_location,
7832 "%<constexpr%> needed for in-class initialization of "
7833 "static data member %q#D of non-integral type", decl);
7835 error ("in-class initialization of static data member %q#D of "
7836 "non-literal type", decl);
7840 /* Motion 10 at San Diego: If a static const integral data member is
7841 initialized with an integral constant expression, the initializer
7842 may appear either in the declaration (within the class), or in
7843 the definition, but not both. If it appears in the class, the
7844 member is a member constant. The file-scope definition is always
7846 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7848 error ("invalid in-class initialization of static data member "
7849 "of non-integral type %qT",
7853 else if (!CP_TYPE_CONST_P (type))
7854 error ("ISO C++ forbids in-class initialization of non-const "
7855 "static member %qD",
7857 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7858 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7859 "%qD of non-integral type %qT", decl, type);
7864 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7865 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7866 expressions out into temporary variables so that walk_tree doesn't
7867 step into them (c++/15764). */
7870 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7872 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7873 tree expr = *expr_p;
7874 if (TREE_CODE (expr) == SAVE_EXPR)
7876 tree op = TREE_OPERAND (expr, 0);
7877 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7878 if (TREE_SIDE_EFFECTS (op))
7879 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7882 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7887 /* Entry point for the above. */
7890 stabilize_vla_size (tree size)
7892 struct pointer_set_t *pset = pointer_set_create ();
7893 /* Break out any function calls into temporary variables. */
7894 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7897 /* Given the SIZE (i.e., number of elements) in an array, compute an
7898 appropriate index type for the array. If non-NULL, NAME is the
7899 name of the thing being declared. */
7902 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7907 tree abi_1_itype = NULL_TREE;
7909 if (error_operand_p (size))
7910 return error_mark_node;
7912 type = TREE_TYPE (size);
7913 /* type_dependent_expression_p? */
7914 if (!dependent_type_p (type))
7916 mark_rvalue_use (size);
7918 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7919 && TREE_SIDE_EFFECTS (size))
7920 /* In C++98, we mark a non-constant array bound with a magic
7921 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7924 size = fold_non_dependent_expr (size);
7926 if (CLASS_TYPE_P (type)
7927 && CLASSTYPE_LITERAL_P (type))
7929 size = build_expr_type_conversion (WANT_INT, size, true);
7932 if (!(complain & tf_error))
7933 return error_mark_node;
7935 error ("size of array %qD has non-integral type %qT",
7938 error ("size of array has non-integral type %qT", type);
7939 size = integer_one_node;
7941 if (size == error_mark_node)
7942 return error_mark_node;
7943 type = TREE_TYPE (size);
7944 /* We didn't support this case in GCC 3.2, so don't bother
7945 trying to model it now in ABI v1. */
7946 abi_1_itype = error_mark_node;
7949 size = maybe_constant_value (size);
7950 if (!TREE_CONSTANT (size))
7954 if (error_operand_p (size))
7955 return error_mark_node;
7957 /* The array bound must be an integer type. */
7958 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7960 if (!(complain & tf_error))
7961 return error_mark_node;
7963 error ("size of array %qD has non-integral type %qT", name, type);
7965 error ("size of array has non-integral type %qT", type);
7966 size = integer_one_node;
7967 type = TREE_TYPE (size);
7971 /* A type is dependent if it is...an array type constructed from any
7972 dependent type or whose size is specified by a constant expression
7973 that is value-dependent. */
7974 /* We can only call value_dependent_expression_p on integral constant
7975 expressions; treat non-constant expressions as dependent, too. */
7976 if (processing_template_decl
7977 && (dependent_type_p (type)
7978 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7980 /* We cannot do any checking for a SIZE that isn't known to be
7981 constant. Just build the index type and mark that it requires
7982 structural equality checks. */
7983 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7984 size, integer_one_node));
7985 TYPE_DEPENDENT_P (itype) = 1;
7986 TYPE_DEPENDENT_P_VALID (itype) = 1;
7987 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7991 if (!abi_version_at_least (2) && processing_template_decl
7992 && abi_1_itype == NULL_TREE)
7993 /* For abi-1, we handled all instances in templates the same way,
7994 even when they were non-dependent. This affects the manglings
7995 produced. So, we do the normal checking for non-dependent
7996 sizes, but at the end we'll return the same type that abi-1
7997 would have, but with TYPE_CANONICAL set to the "right"
7998 value that the current ABI would provide. */
7999 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
8000 osize, integer_one_node));
8002 /* Normally, the array-bound will be a constant. */
8003 if (TREE_CODE (size) == INTEGER_CST)
8005 /* Check to see if the array bound overflowed. Make that an
8006 error, no matter how generous we're being. */
8007 constant_expression_error (size);
8009 /* An array must have a positive number of elements. */
8010 if (INT_CST_LT (size, integer_zero_node))
8012 if (!(complain & tf_error))
8013 return error_mark_node;
8015 error ("size of array %qD is negative", name);
8017 error ("size of array is negative");
8018 size = integer_one_node;
8020 /* As an extension we allow zero-sized arrays. */
8021 else if (integer_zerop (size))
8023 if (!(complain & tf_error))
8024 /* We must fail if performing argument deduction (as
8025 indicated by the state of complain), so that
8026 another substitution can be found. */
8027 return error_mark_node;
8028 else if (in_system_header)
8029 /* Allow them in system headers because glibc uses them. */;
8031 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
8033 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
8036 else if (TREE_CONSTANT (size)
8037 /* We don't allow VLAs at non-function scopes, or during
8038 tentative template substitution. */
8039 || !at_function_scope_p () || !(complain & tf_error))
8041 if (!(complain & tf_error))
8042 return error_mark_node;
8043 /* `(int) &fn' is not a valid array bound. */
8045 error ("size of array %qD is not an integral constant-expression",
8048 error ("size of array is not an integral constant-expression");
8049 size = integer_one_node;
8051 else if (pedantic && warn_vla != 0)
8054 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8056 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8058 else if (warn_vla > 0)
8062 "variable length array %qD is used", name);
8065 "variable length array is used");
8068 if (processing_template_decl && !TREE_CONSTANT (size))
8069 /* A variable sized array. */
8070 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8073 HOST_WIDE_INT saved_processing_template_decl;
8075 /* Compute the index of the largest element in the array. It is
8076 one less than the number of elements in the array. We save
8077 and restore PROCESSING_TEMPLATE_DECL so that computations in
8078 cp_build_binary_op will be appropriately folded. */
8079 saved_processing_template_decl = processing_template_decl;
8080 processing_template_decl = 0;
8081 itype = cp_build_binary_op (input_location,
8083 cp_convert (ssizetype, size),
8084 cp_convert (ssizetype, integer_one_node),
8085 tf_warning_or_error);
8086 itype = fold (itype);
8087 processing_template_decl = saved_processing_template_decl;
8089 if (!TREE_CONSTANT (itype))
8090 /* A variable sized array. */
8091 itype = variable_size (itype);
8092 /* Make sure that there was no overflow when creating to a signed
8093 index type. (For example, on a 32-bit machine, an array with
8094 size 2^32 - 1 is too big.) */
8095 else if (TREE_CODE (itype) == INTEGER_CST
8096 && TREE_OVERFLOW (itype))
8098 if (!(complain & tf_error))
8099 return error_mark_node;
8100 error ("overflow in array dimension");
8101 TREE_OVERFLOW (itype) = 0;
8105 /* Create and return the appropriate index type. */
8106 if (abi_1_itype && abi_1_itype != error_mark_node)
8108 tree t = build_index_type (itype);
8109 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8110 itype = abi_1_itype;
8113 itype = build_index_type (itype);
8115 /* If the index type were dependent, we would have returned early, so
8116 remember that it isn't. */
8117 TYPE_DEPENDENT_P (itype) = 0;
8118 TYPE_DEPENDENT_P_VALID (itype) = 1;
8122 /* Returns the scope (if any) in which the entity declared by
8123 DECLARATOR will be located. If the entity was declared with an
8124 unqualified name, NULL_TREE is returned. */
8127 get_scope_of_declarator (const cp_declarator *declarator)
8129 while (declarator && declarator->kind != cdk_id)
8130 declarator = declarator->declarator;
8132 /* If the declarator-id is a SCOPE_REF, the scope in which the
8133 declaration occurs is the first operand. */
8135 && declarator->u.id.qualifying_scope)
8136 return declarator->u.id.qualifying_scope;
8138 /* Otherwise, the declarator is not a qualified name; the entity will
8139 be declared in the current scope. */
8143 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8144 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8148 create_array_type_for_decl (tree name, tree type, tree size)
8150 tree itype = NULL_TREE;
8152 /* If things have already gone awry, bail now. */
8153 if (type == error_mark_node || size == error_mark_node)
8154 return error_mark_node;
8156 /* 8.3.4/1: If the type of the identifier of D contains the auto
8157 type-specifier, the program is ill-formed. */
8158 if (pedantic && type_uses_auto (type))
8159 pedwarn (input_location, OPT_pedantic,
8160 "declaration of %qD as array of %<auto%>", name);
8162 /* If there are some types which cannot be array elements,
8163 issue an error-message and return. */
8164 switch (TREE_CODE (type))
8168 error ("declaration of %qD as array of void", name);
8170 error ("creating array of void");
8171 return error_mark_node;
8175 error ("declaration of %qD as array of functions", name);
8177 error ("creating array of functions");
8178 return error_mark_node;
8180 case REFERENCE_TYPE:
8182 error ("declaration of %qD as array of references", name);
8184 error ("creating array of references");
8185 return error_mark_node;
8189 error ("declaration of %qD as array of function members", name);
8191 error ("creating array of function members");
8192 return error_mark_node;
8200 The constant expressions that specify the bounds of the arrays
8201 can be omitted only for the first member of the sequence. */
8202 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8205 error ("declaration of %qD as multidimensional array must "
8206 "have bounds for all dimensions except the first",
8209 error ("multidimensional array must have bounds for all "
8210 "dimensions except the first");
8212 return error_mark_node;
8215 /* Figure out the index type for the array. */
8217 itype = compute_array_index_type (name, size, tf_warning_or_error);
8220 T is called the array element type; this type shall not be [...] an
8221 abstract class type. */
8222 abstract_virtuals_error (name, type);
8224 return build_cplus_array_type (type, itype);
8227 /* Check that it's OK to declare a function with the indicated TYPE.
8228 SFK indicates the kind of special function (if any) that this
8229 function is. OPTYPE is the type given in a conversion operator
8230 declaration, or the class type for a constructor/destructor.
8231 Returns the actual return type of the function; that
8232 may be different than TYPE if an error occurs, or for certain
8233 special functions. */
8236 check_special_function_return_type (special_function_kind sfk,
8242 case sfk_constructor:
8244 error ("return type specification for constructor invalid");
8246 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8247 type = build_pointer_type (optype);
8249 type = void_type_node;
8252 case sfk_destructor:
8254 error ("return type specification for destructor invalid");
8255 /* We can't use the proper return type here because we run into
8256 problems with ambiguous bases and covariant returns.
8257 Java classes are left unchanged because (void *) isn't a valid
8258 Java type, and we don't want to change the Java ABI. */
8259 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8260 type = build_pointer_type (void_type_node);
8262 type = void_type_node;
8265 case sfk_conversion:
8267 error ("return type specified for %<operator %T%>", optype);
8278 /* A variable or data member (whose unqualified name is IDENTIFIER)
8279 has been declared with the indicated TYPE. If the TYPE is not
8280 acceptable, issue an error message and return a type to use for
8281 error-recovery purposes. */
8284 check_var_type (tree identifier, tree type)
8286 if (VOID_TYPE_P (type))
8289 error ("unnamed variable or field declared void");
8290 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8292 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8293 error ("variable or field %qE declared void", identifier);
8296 error ("variable or field declared void");
8297 type = error_mark_node;
8303 /* Given declspecs and a declarator (abstract or otherwise), determine
8304 the name and type of the object declared and construct a DECL node
8307 DECLSPECS points to the representation of declaration-specifier
8308 sequence that precedes declarator.
8310 DECL_CONTEXT says which syntactic context this declaration is in:
8311 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8312 FUNCDEF for a function definition. Like NORMAL but a few different
8313 error messages in each case. Return value may be zero meaning
8314 this definition is too screwy to try to parse.
8315 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8316 handle member functions (which have FIELD context).
8317 Return value may be zero meaning this definition is too screwy to
8319 PARM for a parameter declaration (either within a function prototype
8320 or before a function body). Make a PARM_DECL, or return void_type_node.
8321 TPARM for a template parameter declaration.
8322 CATCHPARM for a parameter declaration before a catch clause.
8323 TYPENAME if for a typename (in a cast or sizeof).
8324 Don't make a DECL node; just return the ..._TYPE node.
8325 FIELD for a struct or union field; make a FIELD_DECL.
8326 BITFIELD for a field with specified width.
8328 INITIALIZED is as for start_decl.
8330 ATTRLIST is a pointer to the list of attributes, which may be NULL
8331 if there are none; *ATTRLIST may be modified if attributes from inside
8332 the declarator should be applied to the declaration.
8334 When this function is called, scoping variables (such as
8335 CURRENT_CLASS_TYPE) should reflect the scope in which the
8336 declaration occurs, not the scope in which the new declaration will
8337 be placed. For example, on:
8341 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8344 Returns a DECL (if a declarator is present), a TYPE (if there is no
8345 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8349 grokdeclarator (const cp_declarator *declarator,
8350 const cp_decl_specifier_seq *declspecs,
8351 enum decl_context decl_context,
8355 tree type = NULL_TREE;
8357 int explicit_int128 = 0;
8358 int virtualp, explicitp, friendp, inlinep, staticp;
8359 int explicit_int = 0;
8360 int explicit_char = 0;
8361 int defaulted_int = 0;
8362 tree dependent_name = NULL_TREE;
8364 tree typedef_decl = NULL_TREE;
8365 const char *name = NULL;
8366 tree typedef_type = NULL_TREE;
8367 /* True if this declarator is a function definition. */
8368 bool funcdef_flag = false;
8369 cp_declarator_kind innermost_code = cdk_error;
8372 /* See the code below that used this. */
8373 tree decl_attr = NULL_TREE;
8376 /* Keep track of what sort of function is being processed
8377 so that we can warn about default return values, or explicit
8378 return values which do not match prescribed defaults. */
8379 special_function_kind sfk = sfk_none;
8381 tree dname = NULL_TREE;
8382 tree ctor_return_type = NULL_TREE;
8383 enum overload_flags flags = NO_SPECIAL;
8384 /* cv-qualifiers that apply to the declarator, for a declaration of
8385 a member function. */
8386 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8387 /* virt-specifiers that apply to the declarator, for a declaration of
8388 a member function. */
8389 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8390 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8392 tree raises = NULL_TREE;
8393 int template_count = 0;
8394 tree returned_attrs = NULL_TREE;
8395 tree parms = NULL_TREE;
8396 const cp_declarator *id_declarator;
8397 /* The unqualified name of the declarator; either an
8398 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8399 tree unqualified_id;
8400 /* The class type, if any, in which this entity is located,
8401 or NULL_TREE if none. Note that this value may be different from
8402 the current class type; for example if an attempt is made to declare
8403 "A::f" inside "B", this value will be "A". */
8404 tree ctype = current_class_type;
8405 /* The NAMESPACE_DECL for the namespace in which this entity is
8406 located. If an unqualified name is used to declare the entity,
8407 this value will be NULL_TREE, even if the entity is located at
8409 tree in_namespace = NULL_TREE;
8410 cp_storage_class storage_class;
8411 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8412 bool type_was_error_mark_node = false;
8413 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8414 bool template_type_arg = false;
8415 bool template_parm_flag = false;
8416 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8419 signed_p = declspecs->specs[(int)ds_signed];
8420 unsigned_p = declspecs->specs[(int)ds_unsigned];
8421 short_p = declspecs->specs[(int)ds_short];
8422 long_p = declspecs->specs[(int)ds_long];
8423 longlong = declspecs->specs[(int)ds_long] >= 2;
8424 explicit_int128 = declspecs->explicit_int128_p;
8425 thread_p = declspecs->specs[(int)ds_thread];
8427 if (decl_context == FUNCDEF)
8428 funcdef_flag = true, decl_context = NORMAL;
8429 else if (decl_context == MEMFUNCDEF)
8430 funcdef_flag = true, decl_context = FIELD;
8431 else if (decl_context == BITFIELD)
8432 bitfield = 1, decl_context = FIELD;
8433 else if (decl_context == TEMPLATE_TYPE_ARG)
8434 template_type_arg = true, decl_context = TYPENAME;
8435 else if (decl_context == TPARM)
8436 template_parm_flag = true, decl_context = PARM;
8438 if (initialized > 1)
8439 funcdef_flag = true;
8441 /* Look inside a declarator for the name being declared
8442 and get it as a string, for an error message. */
8443 for (id_declarator = declarator;
8445 id_declarator = id_declarator->declarator)
8447 if (id_declarator->kind != cdk_id)
8448 innermost_code = id_declarator->kind;
8450 switch (id_declarator->kind)
8453 if (id_declarator->declarator
8454 && id_declarator->declarator->kind == cdk_id)
8456 sfk = id_declarator->declarator->u.id.sfk;
8457 if (sfk == sfk_destructor)
8464 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8465 tree decl = id_declarator->u.id.unqualified_name;
8468 if (qualifying_scope)
8470 if (at_function_scope_p ())
8474 A declarator-id shall not be qualified except
8477 None of the cases are permitted in block
8479 if (qualifying_scope == global_namespace)
8480 error ("invalid use of qualified-name %<::%D%>",
8482 else if (TYPE_P (qualifying_scope))
8483 error ("invalid use of qualified-name %<%T::%D%>",
8484 qualifying_scope, decl);
8486 error ("invalid use of qualified-name %<%D::%D%>",
8487 qualifying_scope, decl);
8488 return error_mark_node;
8490 else if (TYPE_P (qualifying_scope))
8492 ctype = qualifying_scope;
8493 if (!MAYBE_CLASS_TYPE_P (ctype))
8495 error ("%q#T is not a class or a namespace", ctype);
8498 else if (innermost_code != cdk_function
8499 && current_class_type
8500 && !UNIQUELY_DERIVED_FROM_P (ctype,
8501 current_class_type))
8503 error ("type %qT is not derived from type %qT",
8504 ctype, current_class_type);
8505 return error_mark_node;
8508 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8509 in_namespace = qualifying_scope;
8511 switch (TREE_CODE (decl))
8517 if (innermost_code != cdk_function)
8519 error ("declaration of %qD as non-function", decl);
8520 return error_mark_node;
8522 else if (!qualifying_scope
8523 && !(current_class_type && at_class_scope_p ()))
8525 error ("declaration of %qD as non-member", decl);
8526 return error_mark_node;
8529 type = TREE_OPERAND (decl, 0);
8531 type = constructor_name (type);
8532 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8537 case TEMPLATE_ID_EXPR:
8539 tree fns = TREE_OPERAND (decl, 0);
8542 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8544 gcc_assert (is_overloaded_fn (dname));
8545 dname = DECL_NAME (get_first_fn (dname));
8550 case IDENTIFIER_NODE:
8551 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8554 if (C_IS_RESERVED_WORD (dname))
8556 error ("declarator-id missing; using reserved word %qD",
8558 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8560 else if (!IDENTIFIER_TYPENAME_P (dname))
8561 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8564 gcc_assert (flags == NO_SPECIAL);
8565 flags = TYPENAME_FLAG;
8566 ctor_return_type = TREE_TYPE (dname);
8567 sfk = sfk_conversion;
8568 if (is_typename_at_global_scope (dname))
8569 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8571 name = "<invalid operator>";
8588 return error_mark_node;
8593 if (id_declarator->kind == cdk_id)
8599 The declarator in a function-definition shall have the form
8600 D1 ( parameter-declaration-clause) ... */
8601 if (funcdef_flag && innermost_code != cdk_function)
8603 error ("function definition does not declare parameters");
8604 return error_mark_node;
8607 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8608 && innermost_code != cdk_function
8609 && ! (ctype && !declspecs->any_specifiers_p))
8611 error ("declaration of %qD as non-function", dname);
8612 return error_mark_node;
8616 && TREE_CODE (dname) == IDENTIFIER_NODE
8617 && UDLIT_OPER_P (dname)
8618 && innermost_code != cdk_function)
8620 error ("declaration of %qD as non-function", dname);
8621 return error_mark_node;
8624 if (dname && IDENTIFIER_OPNAME_P (dname))
8626 if (declspecs->specs[(int)ds_typedef])
8628 error ("declaration of %qD as %<typedef%>", dname);
8629 return error_mark_node;
8631 else if (decl_context == PARM || decl_context == CATCHPARM)
8633 error ("declaration of %qD as parameter", dname);
8634 return error_mark_node;
8638 /* Anything declared one level down from the top level
8639 must be one of the parameters of a function
8640 (because the body is at least two levels down). */
8642 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8643 by not allowing C++ class definitions to specify their parameters
8644 with xdecls (must be spec.d in the parmlist).
8646 Since we now wait to push a class scope until we are sure that
8647 we are in a legitimate method context, we must set oldcname
8648 explicitly (since current_class_name is not yet alive).
8650 We also want to avoid calling this a PARM if it is in a namespace. */
8652 if (decl_context == NORMAL && !toplevel_bindings_p ())
8654 cp_binding_level *b = current_binding_level;
8655 current_binding_level = b->level_chain;
8656 if (current_binding_level != 0 && toplevel_bindings_p ())
8657 decl_context = PARM;
8658 current_binding_level = b;
8662 name = decl_context == PARM ? "parameter" : "type name";
8664 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8666 error ("%<constexpr%> cannot appear in a typedef declaration");
8667 return error_mark_node;
8670 /* If there were multiple types specified in the decl-specifier-seq,
8671 issue an error message. */
8672 if (declspecs->multiple_types_p)
8674 error ("two or more data types in declaration of %qs", name);
8675 return error_mark_node;
8678 if (declspecs->conflicting_specifiers_p)
8680 error ("conflicting specifiers in declaration of %qs", name);
8681 return error_mark_node;
8684 /* Extract the basic type from the decl-specifier-seq. */
8685 type = declspecs->type;
8686 if (type == error_mark_node)
8689 type_was_error_mark_node = true;
8691 /* If the entire declaration is itself tagged as deprecated then
8692 suppress reports of deprecated items. */
8693 if (type && TREE_DEPRECATED (type)
8694 && deprecated_state != DEPRECATED_SUPPRESS)
8695 warn_deprecated_use (type, NULL_TREE);
8696 if (type && TREE_CODE (type) == TYPE_DECL)
8698 typedef_decl = type;
8699 type = TREE_TYPE (typedef_decl);
8700 if (TREE_DEPRECATED (type)
8701 && DECL_ARTIFICIAL (typedef_decl)
8702 && deprecated_state != DEPRECATED_SUPPRESS)
8703 warn_deprecated_use (type, NULL_TREE);
8705 /* No type at all: default to `int', and set DEFAULTED_INT
8706 because it was not a user-defined typedef. */
8707 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8709 /* These imply 'int'. */
8710 type = integer_type_node;
8714 explicit_int = declspecs->explicit_int_p;
8715 explicit_char = declspecs->explicit_char_p;
8718 /* See the code below that used this. */
8720 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8722 typedef_type = type;
8725 if (sfk != sfk_conversion)
8726 ctor_return_type = ctype;
8728 if (sfk != sfk_none)
8729 type = check_special_function_return_type (sfk, type,
8731 else if (type == NULL_TREE)
8737 /* We handle `main' specially here, because 'main () { }' is so
8738 common. With no options, it is allowed. With -Wreturn-type,
8739 it is a warning. It is only an error with -pedantic-errors. */
8740 is_main = (funcdef_flag
8741 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8742 && MAIN_NAME_P (dname)
8743 && ctype == NULL_TREE
8744 && in_namespace == NULL_TREE
8745 && current_namespace == global_namespace);
8747 if (type_was_error_mark_node)
8748 /* We've already issued an error, don't complain more. */;
8749 else if (in_system_header || flag_ms_extensions)
8750 /* Allow it, sigh. */;
8752 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8754 pedwarn (input_location, OPT_pedantic,
8755 "ISO C++ forbids declaration of %qs with no type", name);
8757 warning (OPT_Wreturn_type,
8758 "ISO C++ forbids declaration of %qs with no type", name);
8760 type = integer_type_node;
8765 if (explicit_int128)
8767 if (int128_integer_type_node == NULL_TREE)
8769 error ("%<__int128%> is not supported by this target");
8770 explicit_int128 = false;
8772 else if (pedantic && ! in_system_header)
8773 pedwarn (input_location, OPT_pedantic,
8774 "ISO C++ does not support %<__int128%> for %qs", name);
8777 /* Now process the modifiers that were specified
8778 and check for invalid combinations. */
8780 /* Long double is a special combination. */
8781 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8784 type = cp_build_qualified_type (long_double_type_node,
8785 cp_type_quals (type));
8788 /* Check all other uses of type modifiers. */
8790 if (unsigned_p || signed_p || long_p || short_p)
8794 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8795 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8796 else if (signed_p && unsigned_p)
8797 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8798 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8799 error ("%<long long%> invalid for %qs", name);
8800 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8801 error ("%<long%> invalid for %qs", name);
8802 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8803 error ("%<short%> invalid for %qs", name);
8804 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8805 error ("%<long%> or %<short%> invalid for %qs", name);
8806 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8807 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8808 else if ((long_p || short_p) && explicit_char)
8809 error ("%<long%> or %<short%> specified with char for %qs", name);
8810 else if (long_p && short_p)
8811 error ("%<long%> and %<short%> specified together for %qs", name);
8812 else if (type == char16_type_node || type == char32_type_node)
8814 if (signed_p || unsigned_p)
8815 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8816 else if (short_p || long_p)
8817 error ("%<short%> or %<long%> invalid for %qs", name);
8822 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8824 pedwarn (input_location, OPT_pedantic,
8825 "long, short, signed or unsigned used invalidly for %qs",
8827 if (flag_pedantic_errors)
8832 /* Discard the type modifiers if they are invalid. */
8843 /* Decide whether an integer type is signed or not.
8844 Optionally treat bitfields as signed by default. */
8848 It is implementation-defined whether a plain (neither
8849 explicitly signed or unsigned) char, short, int, or long
8850 bit-field is signed or unsigned.
8852 Naturally, we extend this to long long as well. Note that
8853 this does not include wchar_t. */
8854 || (bitfield && !flag_signed_bitfields
8856 /* A typedef for plain `int' without `signed' can be
8857 controlled just like plain `int', but a typedef for
8858 `signed int' cannot be so controlled. */
8860 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8861 && TREE_CODE (type) == INTEGER_TYPE
8862 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8864 if (explicit_int128)
8865 type = int128_unsigned_type_node;
8867 type = long_long_unsigned_type_node;
8869 type = long_unsigned_type_node;
8871 type = short_unsigned_type_node;
8872 else if (type == char_type_node)
8873 type = unsigned_char_type_node;
8874 else if (typedef_decl)
8875 type = unsigned_type_for (type);
8877 type = unsigned_type_node;
8879 else if (signed_p && type == char_type_node)
8880 type = signed_char_type_node;
8881 else if (explicit_int128)
8882 type = int128_integer_type_node;
8884 type = long_long_integer_type_node;
8886 type = long_integer_type_node;
8888 type = short_integer_type_node;
8890 if (declspecs->specs[(int)ds_complex])
8892 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8893 error ("complex invalid for %qs", name);
8894 /* If we just have "complex", it is equivalent to
8895 "complex double", but if any modifiers at all are specified it is
8896 the complex form of TYPE. E.g, "complex short" is
8897 "complex short int". */
8898 else if (defaulted_int && ! longlong && ! explicit_int128
8899 && ! (long_p || short_p || signed_p || unsigned_p))
8900 type = complex_double_type_node;
8901 else if (type == integer_type_node)
8902 type = complex_integer_type_node;
8903 else if (type == float_type_node)
8904 type = complex_float_type_node;
8905 else if (type == double_type_node)
8906 type = complex_double_type_node;
8907 else if (type == long_double_type_node)
8908 type = complex_long_double_type_node;
8910 type = build_complex_type (type);
8913 type_quals = TYPE_UNQUALIFIED;
8914 if (declspecs->specs[(int)ds_const])
8915 type_quals |= TYPE_QUAL_CONST;
8916 if (declspecs->specs[(int)ds_volatile])
8917 type_quals |= TYPE_QUAL_VOLATILE;
8918 if (declspecs->specs[(int)ds_restrict])
8919 type_quals |= TYPE_QUAL_RESTRICT;
8920 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8921 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8924 type_quals |= cp_type_quals (type);
8925 type = cp_build_qualified_type_real
8926 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8927 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8928 /* We might have ignored or rejected some of the qualifiers. */
8929 type_quals = cp_type_quals (type);
8932 inlinep = !! declspecs->specs[(int)ds_inline];
8933 virtualp = !! declspecs->specs[(int)ds_virtual];
8934 explicitp = !! declspecs->specs[(int)ds_explicit];
8936 storage_class = declspecs->storage_class;
8937 if (storage_class == sc_static)
8938 staticp = 1 + (decl_context == FIELD);
8940 if (virtualp && staticp == 2)
8942 error ("member %qD cannot be declared both virtual and static", dname);
8943 storage_class = sc_none;
8946 friendp = !! declspecs->specs[(int)ds_friend];
8948 if (dependent_name && !friendp)
8950 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8951 return error_mark_node;
8954 /* Issue errors about use of storage classes for parameters. */
8955 if (decl_context == PARM)
8957 if (declspecs->specs[(int)ds_typedef])
8959 error ("typedef declaration invalid in parameter declaration");
8960 return error_mark_node;
8962 else if (template_parm_flag && storage_class != sc_none)
8964 error ("storage class specified for template parameter %qs", name);
8965 return error_mark_node;
8967 else if (storage_class == sc_static
8968 || storage_class == sc_extern
8970 error ("storage class specifiers invalid in parameter declarations");
8972 /* Function parameters cannot be constexpr. If we saw one, moan
8973 and pretend it wasn't there. */
8976 error ("a parameter cannot be declared %<constexpr%>");
8981 /* Give error if `virtual' is used outside of class declaration. */
8983 && (current_class_name == NULL_TREE || decl_context != FIELD))
8985 error ("%<virtual%> outside class declaration");
8989 /* Static anonymous unions are dealt with here. */
8990 if (staticp && decl_context == TYPENAME
8992 && ANON_AGGR_TYPE_P (declspecs->type))
8993 decl_context = FIELD;
8995 /* Warn about storage classes that are invalid for certain
8996 kinds of declarations (parameters, typenames, etc.). */
8999 && storage_class != sc_extern
9000 && storage_class != sc_static)
9001 || declspecs->specs[(int)ds_typedef]))
9003 error ("multiple storage classes in declaration of %qs", name);
9006 if (decl_context != NORMAL
9007 && ((storage_class != sc_none
9008 && storage_class != sc_mutable)
9011 if ((decl_context == PARM || decl_context == CATCHPARM)
9012 && (storage_class == sc_register
9013 || storage_class == sc_auto))
9015 else if (declspecs->specs[(int)ds_typedef])
9017 else if (decl_context == FIELD
9018 /* C++ allows static class elements. */
9019 && storage_class == sc_static)
9020 /* C++ also allows inlines and signed and unsigned elements,
9021 but in those cases we don't come in here. */
9025 if (decl_context == FIELD)
9026 error ("storage class specified for %qs", name);
9029 if (decl_context == PARM || decl_context == CATCHPARM)
9030 error ("storage class specified for parameter %qs", name);
9032 error ("storage class specified for typename");
9034 if (storage_class == sc_register
9035 || storage_class == sc_auto
9036 || storage_class == sc_extern
9038 storage_class = sc_none;
9041 else if (storage_class == sc_extern && funcdef_flag
9042 && ! toplevel_bindings_p ())
9043 error ("nested function %qs declared %<extern%>", name);
9044 else if (toplevel_bindings_p ())
9046 if (storage_class == sc_auto)
9047 error ("top-level declaration of %qs specifies %<auto%>", name);
9050 && storage_class != sc_extern
9051 && storage_class != sc_static)
9053 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9058 if (storage_class && friendp)
9060 error ("storage class specifiers invalid in friend function declarations");
9061 storage_class = sc_none;
9066 unqualified_id = NULL_TREE;
9069 unqualified_id = id_declarator->u.id.unqualified_name;
9070 switch (TREE_CODE (unqualified_id))
9073 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9074 if (TYPE_P (unqualified_id))
9075 unqualified_id = constructor_name (unqualified_id);
9078 case IDENTIFIER_NODE:
9079 case TEMPLATE_ID_EXPR:
9087 /* Determine the type of the entity declared by recurring on the
9089 for (; declarator; declarator = declarator->declarator)
9091 const cp_declarator *inner_declarator;
9094 if (type == error_mark_node)
9095 return error_mark_node;
9097 attrs = declarator->attributes;
9103 if (declarator == NULL || declarator->kind == cdk_id)
9104 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9105 if (declarator->kind == cdk_function)
9106 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9107 if (declarator->kind == cdk_array)
9108 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9109 returned_attrs = decl_attributes (&type,
9110 chainon (returned_attrs, attrs),
9114 if (declarator->kind == cdk_id)
9117 inner_declarator = declarator->declarator;
9119 switch (declarator->kind)
9122 type = create_array_type_for_decl (dname, type,
9123 declarator->u.array.bounds);
9131 /* Declaring a function type.
9132 Make sure we have a valid type for the function to return. */
9134 if (type_quals != TYPE_UNQUALIFIED)
9136 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9137 warning (OPT_Wignored_qualifiers,
9138 "type qualifiers ignored on function return type");
9139 /* We now know that the TYPE_QUALS don't apply to the
9140 decl, but to its return type. */
9141 type_quals = TYPE_UNQUALIFIED;
9143 errmsg = targetm.invalid_return_type (type);
9147 type = integer_type_node;
9150 /* Error about some types functions can't return. */
9152 if (TREE_CODE (type) == FUNCTION_TYPE)
9154 error ("%qs declared as function returning a function", name);
9155 return error_mark_node;
9157 if (TREE_CODE (type) == ARRAY_TYPE)
9159 error ("%qs declared as function returning an array", name);
9160 return error_mark_node;
9163 /* Pick up type qualifiers which should be applied to `this'. */
9164 memfn_quals = declarator->u.function.qualifiers;
9165 /* Pick up virt-specifiers. */
9166 virt_specifiers = declarator->u.function.virt_specifiers;
9167 /* Pick up the exception specifications. */
9168 raises = declarator->u.function.exception_specification;
9169 /* If the exception-specification is ill-formed, let's pretend
9170 there wasn't one. */
9171 if (raises == error_mark_node)
9174 /* Say it's a definition only for the CALL_EXPR
9175 closest to the identifier. */
9176 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9178 /* Handle a late-specified return type. */
9181 if (type_uses_auto (type))
9183 if (!declarator->u.function.late_return_type)
9185 error ("%qs function uses %<auto%> type specifier without"
9186 " trailing return type", name);
9187 return error_mark_node;
9189 else if (!is_auto (type))
9191 error ("%qs function with trailing return type has"
9192 " %qT as its type rather than plain %<auto%>",
9194 return error_mark_node;
9197 else if (declarator->u.function.late_return_type)
9199 if (cxx_dialect < cxx0x)
9200 /* Not using maybe_warn_cpp0x because this should
9201 always be an error. */
9202 error ("trailing return type only available with "
9203 "-std=c++11 or -std=gnu++11");
9205 error ("%qs function with trailing return type not "
9206 "declared with %<auto%> type specifier", name);
9207 return error_mark_node;
9210 type = splice_late_return_type
9211 (type, declarator->u.function.late_return_type);
9212 if (type == error_mark_node)
9213 return error_mark_node;
9215 if (ctype == NULL_TREE
9216 && decl_context == FIELD
9218 && (friendp == 0 || dname == current_class_name))
9219 ctype = current_class_type;
9221 if (ctype && (sfk == sfk_constructor
9222 || sfk == sfk_destructor))
9224 /* We are within a class's scope. If our declarator name
9225 is the same as the class name, and we are defining
9226 a function, then it is a constructor/destructor, and
9227 therefore returns a void type. */
9229 /* ISO C++ 12.4/2. A destructor may not be declared
9230 const or volatile. A destructor may not be
9233 ISO C++ 12.1. A constructor may not be declared
9234 const or volatile. A constructor may not be
9235 virtual. A constructor may not be static. */
9237 error ((flags == DTOR_FLAG)
9238 ? G_("destructor cannot be static member function")
9239 : G_("constructor cannot be static member function"));
9242 error ((flags == DTOR_FLAG)
9243 ? G_("destructors may not be cv-qualified")
9244 : G_("constructors may not be cv-qualified"));
9245 memfn_quals = TYPE_UNQUALIFIED;
9248 if (decl_context == FIELD
9249 && !member_function_or_else (ctype,
9252 return error_mark_node;
9254 if (flags != DTOR_FLAG)
9256 /* It's a constructor. */
9261 permerror (input_location, "constructors cannot be declared virtual");
9264 if (decl_context == FIELD
9265 && sfk != sfk_constructor)
9266 return error_mark_node;
9268 if (decl_context == FIELD)
9274 error ("can%'t initialize friend function %qs", name);
9277 /* Cannot be both friend and virtual. */
9278 error ("virtual functions cannot be friends");
9281 if (decl_context == NORMAL)
9282 error ("friend declaration not in class definition");
9283 if (current_function_decl && funcdef_flag)
9284 error ("can%'t define friend function %qs in a local "
9288 else if (ctype && sfk == sfk_conversion)
9292 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9297 arg_types = grokparms (declarator->u.function.parameters,
9300 if (inner_declarator
9301 && inner_declarator->kind == cdk_id
9302 && inner_declarator->u.id.sfk == sfk_destructor
9303 && arg_types != void_list_node)
9305 error ("destructors may not have parameters");
9306 arg_types = void_list_node;
9310 type = build_function_type (type, arg_types);
9317 /* Filter out pointers-to-references and references-to-references.
9318 We can get these if a TYPE_DECL is used. */
9320 if (TREE_CODE (type) == REFERENCE_TYPE)
9322 if (declarator->kind != cdk_reference)
9324 error ("cannot declare pointer to %q#T", type);
9325 type = TREE_TYPE (type);
9328 /* In C++0x, we allow reference to reference declarations
9329 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9330 and template type arguments [14.3.1/4 temp.arg.type]. The
9331 check for direct reference to reference declarations, which
9332 are still forbidden, occurs below. Reasoning behind the change
9333 can be found in DR106, DR540, and the rvalue reference
9335 else if (cxx_dialect == cxx98)
9337 error ("cannot declare reference to %q#T", type);
9338 type = TREE_TYPE (type);
9341 else if (VOID_TYPE_P (type))
9343 if (declarator->kind == cdk_reference)
9344 error ("cannot declare reference to %q#T", type);
9345 else if (declarator->kind == cdk_ptrmem)
9346 error ("cannot declare pointer to %q#T member", type);
9349 /* We now know that the TYPE_QUALS don't apply to the decl,
9350 but to the target of the pointer. */
9351 type_quals = TYPE_UNQUALIFIED;
9353 if (declarator->kind == cdk_ptrmem
9354 && (TREE_CODE (type) == FUNCTION_TYPE
9355 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9357 memfn_quals |= type_memfn_quals (type);
9358 type = build_memfn_type (type,
9359 declarator->u.pointer.class_type,
9361 if (type == error_mark_node)
9362 return error_mark_node;
9363 memfn_quals = TYPE_UNQUALIFIED;
9366 if (TREE_CODE (type) == FUNCTION_TYPE
9367 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9368 error (declarator->kind == cdk_reference
9369 ? G_("cannot declare reference to qualified function type %qT")
9370 : G_("cannot declare pointer to qualified function type %qT"),
9373 /* When the pointed-to type involves components of variable size,
9374 care must be taken to ensure that the size evaluation code is
9375 emitted early enough to dominate all the possible later uses
9376 and late enough for the variables on which it depends to have
9379 This is expected to happen automatically when the pointed-to
9380 type has a name/declaration of it's own, but special attention
9381 is required if the type is anonymous.
9383 We handle the NORMAL and FIELD contexts here by inserting a
9384 dummy statement that just evaluates the size at a safe point
9385 and ensures it is not deferred until e.g. within a deeper
9386 conditional context (c++/43555).
9388 We expect nothing to be needed here for PARM or TYPENAME.
9389 Evaluating the size at this point for TYPENAME would
9390 actually be incorrect, as we might be in the middle of an
9391 expression with side effects on the pointed-to type size
9392 "arguments" prior to the pointer declaration point and the
9393 size evaluation could end up prior to the side effects. */
9395 if (!TYPE_NAME (type)
9396 && (decl_context == NORMAL || decl_context == FIELD)
9397 && at_function_scope_p ()
9398 && variably_modified_type_p (type, NULL_TREE))
9400 /* First break out any side-effects. */
9401 stabilize_vla_size (TYPE_SIZE (type));
9402 /* And then force evaluation of the SAVE_EXPR. */
9403 finish_expr_stmt (TYPE_SIZE (type));
9406 if (declarator->kind == cdk_reference)
9408 /* In C++0x, the type we are creating a reference to might be
9409 a typedef which is itself a reference type. In that case,
9410 we follow the reference collapsing rules in
9411 [7.1.3/8 dcl.typedef] to create the final reference type:
9413 "If a typedef TD names a type that is a reference to a type
9414 T, an attempt to create the type 'lvalue reference to cv TD'
9415 creates the type 'lvalue reference to T,' while an attempt
9416 to create the type "rvalue reference to cv TD' creates the
9419 if (VOID_TYPE_P (type))
9420 /* We already gave an error. */;
9421 else if (TREE_CODE (type) == REFERENCE_TYPE)
9423 if (declarator->u.reference.rvalue_ref)
9424 /* Leave type alone. */;
9426 type = cp_build_reference_type (TREE_TYPE (type), false);
9429 type = cp_build_reference_type
9430 (type, declarator->u.reference.rvalue_ref);
9432 /* In C++0x, we need this check for direct reference to
9433 reference declarations, which are forbidden by
9434 [8.3.2/5 dcl.ref]. Reference to reference declarations
9435 are only allowed indirectly through typedefs and template
9436 type arguments. Example:
9438 void foo(int & &); // invalid ref-to-ref decl
9440 typedef int & int_ref;
9441 void foo(int_ref &); // valid ref-to-ref decl
9443 if (inner_declarator && inner_declarator->kind == cdk_reference)
9444 error ("cannot declare reference to %q#T, which is not "
9445 "a typedef or a template type argument", type);
9447 else if (TREE_CODE (type) == METHOD_TYPE)
9448 type = build_ptrmemfunc_type (build_pointer_type (type));
9449 else if (declarator->kind == cdk_ptrmem)
9451 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9453 if (declarator->u.pointer.class_type == error_mark_node)
9454 /* We will already have complained. */
9455 type = error_mark_node;
9457 type = build_ptrmem_type (declarator->u.pointer.class_type,
9461 type = build_pointer_type (type);
9463 /* Process a list of type modifier keywords (such as
9464 const or volatile) that were given inside the `*' or `&'. */
9466 if (declarator->u.pointer.qualifiers)
9469 = cp_build_qualified_type (type,
9470 declarator->u.pointer.qualifiers);
9471 type_quals = cp_type_quals (type);
9484 /* We need to stabilize side-effects in VLA sizes for regular array
9485 declarations too, not just pointers to arrays. */
9486 if (type != error_mark_node && !TYPE_NAME (type)
9487 && (decl_context == NORMAL || decl_context == FIELD)
9488 && at_function_scope_p ()
9489 && variably_modified_type_p (type, NULL_TREE))
9490 stabilize_vla_size (TYPE_SIZE (type));
9492 /* A `constexpr' specifier used in an object declaration declares
9493 the object as `const'. */
9494 if (constexpr_p && innermost_code != cdk_function)
9496 if (type_quals & TYPE_QUAL_CONST)
9497 error ("both %<const%> and %<constexpr%> cannot be used here");
9498 if (type_quals & TYPE_QUAL_VOLATILE)
9499 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9500 if (TREE_CODE (type) != REFERENCE_TYPE)
9502 type_quals |= TYPE_QUAL_CONST;
9503 type = cp_build_qualified_type (type, type_quals);
9507 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9508 && TREE_CODE (type) != FUNCTION_TYPE
9509 && TREE_CODE (type) != METHOD_TYPE)
9511 error ("template-id %qD used as a declarator",
9513 unqualified_id = dname;
9516 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9517 qualified with a class-name, turn it into a METHOD_TYPE, unless
9518 we know that the function is static. We take advantage of this
9519 opportunity to do other processing that pertains to entities
9520 explicitly declared to be class members. Note that if DECLARATOR
9521 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9522 would not have exited the loop above. */
9524 && declarator->u.id.qualifying_scope
9525 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9529 ctype = declarator->u.id.qualifying_scope;
9530 ctype = TYPE_MAIN_VARIANT (ctype);
9532 while (t != NULL_TREE && CLASS_TYPE_P (t))
9534 /* You're supposed to have one `template <...>' for every
9535 template class, but you don't need one for a full
9536 specialization. For example:
9538 template <class T> struct S{};
9539 template <> struct S<int> { void f(); };
9540 void S<int>::f () {}
9542 is correct; there shouldn't be a `template <>' for the
9543 definition of `S<int>::f'. */
9544 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9545 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9546 /* T is an explicit (not partial) specialization. All
9547 containing classes must therefore also be explicitly
9550 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9551 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9552 template_count += 1;
9554 t = TYPE_MAIN_DECL (t);
9555 t = DECL_CONTEXT (t);
9558 if (ctype == current_class_type)
9562 permerror (input_location, "member functions are implicitly friends of their class");
9566 permerror (declarator->id_loc,
9567 "extra qualification %<%T::%> on member %qs",
9570 else if (/* If the qualifying type is already complete, then we
9571 can skip the following checks. */
9572 !COMPLETE_TYPE_P (ctype)
9573 && (/* If the function is being defined, then
9574 qualifying type must certainly be complete. */
9576 /* A friend declaration of "T::f" is OK, even if
9577 "T" is a template parameter. But, if this
9578 function is not a friend, the qualifying type
9580 || (!friendp && !CLASS_TYPE_P (ctype))
9581 /* For a declaration, the type need not be
9582 complete, if either it is dependent (since there
9583 is no meaningful definition of complete in that
9584 case) or the qualifying class is currently being
9586 || !(dependent_type_p (ctype)
9587 || currently_open_class (ctype)))
9588 /* Check that the qualifying type is complete. */
9589 && !complete_type_or_else (ctype, NULL_TREE))
9590 return error_mark_node;
9591 else if (TREE_CODE (type) == FUNCTION_TYPE)
9593 if (current_class_type
9594 && (!friendp || funcdef_flag))
9597 ? G_("cannot define member function %<%T::%s%> "
9599 : G_("cannot declare member function %<%T::%s%> "
9601 ctype, name, current_class_type);
9602 return error_mark_node;
9605 else if (declspecs->specs[(int)ds_typedef]
9606 && current_class_type)
9608 error ("cannot declare member %<%T::%s%> within %qT",
9609 ctype, name, current_class_type);
9610 return error_mark_node;
9614 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9615 ctype = current_class_type;
9617 /* Now TYPE has the actual type. */
9622 *attrlist = chainon (returned_attrs, *attrlist);
9624 attrlist = &returned_attrs;
9627 /* Handle parameter packs. */
9628 if (parameter_pack_p)
9630 if (decl_context == PARM)
9631 /* Turn the type into a pack expansion.*/
9632 type = make_pack_expansion (type);
9634 error ("non-parameter %qs cannot be a parameter pack", name);
9637 /* Did array size calculations overflow? */
9639 if (TREE_CODE (type) == ARRAY_TYPE
9640 && COMPLETE_TYPE_P (type)
9641 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9642 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9644 error ("size of array %qs is too large", name);
9645 /* If we proceed with the array type as it is, we'll eventually
9646 crash in tree_low_cst(). */
9647 type = error_mark_node;
9650 if ((decl_context == FIELD || decl_context == PARM)
9651 && !processing_template_decl
9652 && variably_modified_type_p (type, NULL_TREE))
9654 if (decl_context == FIELD)
9655 error ("data member may not have variably modified type %qT", type);
9657 error ("parameter may not have variably modified type %qT", type);
9658 type = error_mark_node;
9661 if (explicitp == 1 || (explicitp && friendp))
9663 /* [dcl.fct.spec] The explicit specifier shall only be used in
9664 declarations of constructors within a class definition. */
9665 error ("only declarations of constructors can be %<explicit%>");
9669 if (storage_class == sc_mutable)
9671 if (decl_context != FIELD || friendp)
9673 error ("non-member %qs cannot be declared %<mutable%>", name);
9674 storage_class = sc_none;
9676 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9678 error ("non-object member %qs cannot be declared %<mutable%>", name);
9679 storage_class = sc_none;
9681 else if (TREE_CODE (type) == FUNCTION_TYPE
9682 || TREE_CODE (type) == METHOD_TYPE)
9684 error ("function %qs cannot be declared %<mutable%>", name);
9685 storage_class = sc_none;
9689 error ("static %qs cannot be declared %<mutable%>", name);
9690 storage_class = sc_none;
9692 else if (type_quals & TYPE_QUAL_CONST)
9694 error ("const %qs cannot be declared %<mutable%>", name);
9695 storage_class = sc_none;
9697 else if (TREE_CODE (type) == REFERENCE_TYPE)
9699 permerror (input_location, "reference %qs cannot be declared "
9700 "%<mutable%>", name);
9701 storage_class = sc_none;
9705 /* If this is declaring a typedef name, return a TYPE_DECL. */
9706 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9710 /* Note that the grammar rejects storage classes
9711 in typenames, fields or parameters. */
9712 if (current_lang_name == lang_name_java)
9713 TYPE_FOR_JAVA (type) = 1;
9715 /* This declaration:
9717 typedef void f(int) const;
9719 declares a function type which is not a member of any
9720 particular class, but which is cv-qualified; for
9721 example "f S::*" declares a pointer to a const-qualified
9722 member function of S. We record the cv-qualification in the
9724 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9726 type = apply_memfn_quals (type, memfn_quals);
9728 /* We have now dealt with these qualifiers. */
9729 memfn_quals = TYPE_UNQUALIFIED;
9732 if (type_uses_auto (type))
9734 error ("typedef declared %<auto%>");
9735 type = error_mark_node;
9738 if (decl_context == FIELD)
9739 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9741 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9742 if (id_declarator && declarator->u.id.qualifying_scope) {
9743 error_at (DECL_SOURCE_LOCATION (decl),
9744 "typedef name may not be a nested-name-specifier");
9745 TREE_TYPE (decl) = error_mark_node;
9748 if (decl_context != FIELD)
9750 if (!current_function_decl)
9751 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9752 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9753 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9754 (current_function_decl)))
9755 /* The TYPE_DECL is "abstract" because there will be
9756 clones of this constructor/destructor, and there will
9757 be copies of this TYPE_DECL generated in those
9759 DECL_ABSTRACT (decl) = 1;
9761 else if (constructor_name_p (unqualified_id, current_class_type))
9762 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9763 "as enclosing class",
9766 /* If the user declares "typedef struct {...} foo" then the
9767 struct will have an anonymous name. Fill that name in now.
9768 Nothing can refer to it, so nothing needs know about the name
9770 if (type != error_mark_node
9773 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9774 && TYPE_ANONYMOUS_P (type)
9775 && declspecs->type_definition_p
9776 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9780 /* Replace the anonymous name with the real name everywhere. */
9781 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9783 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9784 /* We do not rename the debug info representing the
9785 anonymous tagged type because the standard says in
9786 [dcl.typedef] that the naming applies only for
9787 linkage purposes. */
9788 /*debug_hooks->set_name (t, decl);*/
9789 TYPE_NAME (t) = decl;
9792 if (TYPE_LANG_SPECIFIC (type))
9793 TYPE_WAS_ANONYMOUS (type) = 1;
9795 /* If this is a typedef within a template class, the nested
9796 type is a (non-primary) template. The name for the
9797 template needs updating as well. */
9798 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9799 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9800 = TYPE_IDENTIFIER (type);
9802 /* Adjust linkage now that we aren't anonymous anymore. */
9803 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9804 determine_visibility (TYPE_MAIN_DECL (type));
9806 /* FIXME remangle member functions; member functions of a
9807 type with external linkage have external linkage. */
9811 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9812 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9814 bad_specifiers (decl, BSP_TYPE, virtualp,
9815 memfn_quals != TYPE_UNQUALIFIED,
9816 inlinep, friendp, raises != NULL_TREE);
9818 if (declspecs->specs[(int)ds_alias])
9819 /* Acknowledge that this was written:
9820 `using analias = atype;'. */
9821 TYPE_DECL_ALIAS_P (decl) = 1;
9826 /* Detect the case of an array type of unspecified size
9827 which came, as such, direct from a typedef name.
9828 We must copy the type, so that the array's domain can be
9829 individually set by the object's initializer. */
9831 if (type && typedef_type
9832 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9833 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9834 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9836 /* Detect where we're using a typedef of function type to declare a
9837 function. PARMS will not be set, so we must create it now. */
9839 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9841 tree decls = NULL_TREE;
9844 for (args = TYPE_ARG_TYPES (type);
9845 args && args != void_list_node;
9846 args = TREE_CHAIN (args))
9848 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9850 DECL_CHAIN (decl) = decls;
9854 parms = nreverse (decls);
9856 if (decl_context != TYPENAME)
9858 /* A cv-qualifier-seq shall only be part of the function type
9859 for a non-static member function. [8.3.5/4 dcl.fct] */
9860 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9861 && (current_class_type == NULL_TREE || staticp) )
9864 ? G_("qualified function types cannot be used to "
9865 "declare static member functions")
9866 : G_("qualified function types cannot be used to "
9867 "declare free functions"));
9868 type = TYPE_MAIN_VARIANT (type);
9871 /* The qualifiers on the function type become the qualifiers on
9872 the non-static member function. */
9873 memfn_quals |= type_memfn_quals (type);
9874 type_quals = TYPE_UNQUALIFIED;
9878 /* If this is a type name (such as, in a cast or sizeof),
9879 compute the type and return it now. */
9881 if (decl_context == TYPENAME)
9883 /* Note that the grammar rejects storage classes
9884 in typenames, fields or parameters. */
9885 if (type_quals != TYPE_UNQUALIFIED)
9886 type_quals = TYPE_UNQUALIFIED;
9888 /* Special case: "friend class foo" looks like a TYPENAME context. */
9891 if (type_quals != TYPE_UNQUALIFIED)
9893 error ("type qualifiers specified for friend class declaration");
9894 type_quals = TYPE_UNQUALIFIED;
9898 error ("%<inline%> specified for friend class declaration");
9904 /* Don't allow friend declaration without a class-key. */
9905 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9906 permerror (input_location, "template parameters cannot be friends");
9907 else if (TREE_CODE (type) == TYPENAME_TYPE)
9908 permerror (input_location, "friend declaration requires class-key, "
9909 "i.e. %<friend class %T::%D%>",
9910 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9912 permerror (input_location, "friend declaration requires class-key, "
9913 "i.e. %<friend %#T%>",
9917 /* Only try to do this stuff if we didn't already give up. */
9918 if (type != integer_type_node)
9920 /* A friendly class? */
9921 if (current_class_type)
9922 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9925 error ("trying to make class %qT a friend of global scope",
9928 type = void_type_node;
9931 else if (memfn_quals)
9933 if (ctype == NULL_TREE
9934 && TREE_CODE (type) == METHOD_TYPE)
9935 ctype = TYPE_METHOD_BASETYPE (type);
9938 type = build_memfn_type (type, ctype, memfn_quals);
9939 /* Core issue #547: need to allow this in template type args. */
9940 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9941 type = apply_memfn_quals (type, memfn_quals);
9943 error ("invalid qualifiers on non-member function type");
9948 else if (unqualified_id == NULL_TREE && decl_context != PARM
9949 && decl_context != CATCHPARM
9950 && TREE_CODE (type) != UNION_TYPE
9953 error ("abstract declarator %qT used as declaration", type);
9954 return error_mark_node;
9957 /* Only functions may be declared using an operator-function-id. */
9959 && IDENTIFIER_OPNAME_P (unqualified_id)
9960 && TREE_CODE (type) != FUNCTION_TYPE
9961 && TREE_CODE (type) != METHOD_TYPE)
9963 error ("declaration of %qD as non-function", unqualified_id);
9964 return error_mark_node;
9967 /* We don't check parameter types here because we can emit a better
9968 error message later. */
9969 if (decl_context != PARM)
9971 type = check_var_type (unqualified_id, type);
9972 if (type == error_mark_node)
9973 return error_mark_node;
9976 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9977 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9979 if (decl_context == PARM || decl_context == CATCHPARM)
9981 if (ctype || in_namespace)
9982 error ("cannot use %<::%> in parameter declaration");
9984 if (type_uses_auto (type))
9986 error ("parameter declared %<auto%>");
9987 type = error_mark_node;
9990 /* A parameter declared as an array of T is really a pointer to T.
9991 One declared as a function is really a pointer to a function.
9992 One declared as a member is really a pointer to member. */
9994 if (TREE_CODE (type) == ARRAY_TYPE)
9996 /* Transfer const-ness of array into that of type pointed to. */
9997 type = build_pointer_type (TREE_TYPE (type));
9998 type_quals = TYPE_UNQUALIFIED;
10000 else if (TREE_CODE (type) == FUNCTION_TYPE)
10001 type = build_pointer_type (type);
10004 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10005 && !NEW_DELETE_OPNAME_P (unqualified_id))
10007 cp_cv_quals real_quals = memfn_quals;
10008 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
10009 real_quals |= TYPE_QUAL_CONST;
10010 type = build_memfn_type (type, ctype, real_quals);
10016 if (decl_context == PARM)
10018 decl = cp_build_parm_decl (unqualified_id, type);
10020 bad_specifiers (decl, BSP_PARM, virtualp,
10021 memfn_quals != TYPE_UNQUALIFIED,
10022 inlinep, friendp, raises != NULL_TREE);
10024 else if (decl_context == FIELD)
10026 if (!staticp && type_uses_auto (type))
10028 error ("non-static data member declared %<auto%>");
10029 type = error_mark_node;
10032 /* The C99 flexible array extension. */
10033 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10034 && TYPE_DOMAIN (type) == NULL_TREE)
10036 tree itype = compute_array_index_type (dname, integer_zero_node,
10037 tf_warning_or_error);
10038 type = build_cplus_array_type (TREE_TYPE (type), itype);
10041 if (type == error_mark_node)
10043 /* Happens when declaring arrays of sizes which
10044 are error_mark_node, for example. */
10047 else if (in_namespace && !friendp)
10049 /* Something like struct S { int N::j; }; */
10050 error ("invalid use of %<::%>");
10051 return error_mark_node;
10053 else if (TREE_CODE (type) == FUNCTION_TYPE
10054 || TREE_CODE (type) == METHOD_TYPE)
10057 tree function_context;
10061 /* This should never happen in pure C++ (the check
10062 could be an assert). It could happen in
10063 Objective-C++ if someone writes invalid code that
10064 uses a function declaration for an instance
10065 variable or property (instance variables and
10066 properties are parsed as FIELD_DECLs, but they are
10067 part of an Objective-C class, not a C++ class).
10068 That code is invalid and is caught by this
10072 error ("declaration of function %qD in invalid context",
10074 return error_mark_node;
10077 /* ``A union may [ ... ] not [ have ] virtual functions.''
10079 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10081 error ("function %qD declared virtual inside a union",
10083 return error_mark_node;
10086 if (NEW_DELETE_OPNAME_P (unqualified_id))
10090 error ("%qD cannot be declared virtual, since it "
10091 "is always static",
10098 /* Check that the name used for a destructor makes sense. */
10099 if (sfk == sfk_destructor)
10101 tree uqname = id_declarator->u.id.unqualified_name;
10105 gcc_assert (friendp);
10106 error ("expected qualified name in friend declaration "
10107 "for destructor %qD", uqname);
10108 return error_mark_node;
10111 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10113 error ("declaration of %qD as member of %qT",
10115 return error_mark_node;
10119 error ("a destructor cannot be %<constexpr%>");
10120 return error_mark_node;
10123 else if (sfk == sfk_constructor && friendp && !ctype)
10125 error ("expected qualified name in friend declaration "
10126 "for constructor %qD",
10127 id_declarator->u.id.unqualified_name);
10128 return error_mark_node;
10131 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10132 function_context = (ctype != NULL_TREE) ?
10133 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10134 publicp = (! friendp || ! staticp)
10135 && function_context == NULL_TREE;
10136 decl = grokfndecl (ctype, type,
10137 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10138 ? unqualified_id : dname,
10141 virtualp, flags, memfn_quals, raises,
10142 friendp ? -1 : 0, friendp, publicp,
10143 inlinep | (2 * constexpr_p),
10145 funcdef_flag, template_count, in_namespace,
10146 attrlist, declarator->id_loc);
10147 decl = set_virt_specifiers (decl, virt_specifiers);
10148 if (decl == NULL_TREE)
10149 return error_mark_node;
10151 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10152 /* The decl and setting of decl_attr is also turned off. */
10153 decl = build_decl_attribute_variant (decl, decl_attr);
10156 /* [class.conv.ctor]
10158 A constructor declared without the function-specifier
10159 explicit that can be called with a single parameter
10160 specifies a conversion from the type of its first
10161 parameter to the type of its class. Such a constructor
10162 is called a converting constructor. */
10163 if (explicitp == 2)
10164 DECL_NONCONVERTING_P (decl) = 1;
10166 else if (!staticp && !dependent_type_p (type)
10167 && !COMPLETE_TYPE_P (complete_type (type))
10168 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10170 if (unqualified_id)
10171 error ("field %qD has incomplete type", unqualified_id);
10173 error ("name %qT has incomplete type", type);
10175 /* If we're instantiating a template, tell them which
10176 instantiation made the field's type be incomplete. */
10177 if (current_class_type
10178 && TYPE_NAME (current_class_type)
10179 && IDENTIFIER_TEMPLATE (current_class_name)
10181 && declspecs->type == type)
10182 error (" in instantiation of template %qT",
10183 current_class_type);
10185 return error_mark_node;
10191 error ("%qE is neither function nor member function; "
10192 "cannot be declared friend", unqualified_id);
10200 /* Friends are treated specially. */
10201 if (ctype == current_class_type)
10202 ; /* We already issued a permerror. */
10203 else if (decl && DECL_NAME (decl))
10205 if (template_class_depth (current_class_type) == 0)
10207 decl = check_explicit_specialization
10208 (unqualified_id, decl, template_count,
10209 2 * funcdef_flag + 4);
10210 if (decl == error_mark_node)
10211 return error_mark_node;
10214 decl = do_friend (ctype, unqualified_id, decl,
10220 return error_mark_node;
10223 /* Structure field. It may not be a function, except for C++. */
10225 if (decl == NULL_TREE)
10229 /* C++ allows static class members. All other work
10230 for this is done by grokfield. */
10231 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10232 set_linkage_for_static_data_member (decl);
10233 /* Even if there is an in-class initialization, DECL
10234 is considered undefined until an out-of-class
10235 definition is provided. */
10236 DECL_EXTERNAL (decl) = 1;
10239 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10241 if (constexpr_p && !initialized)
10243 error ("constexpr static data member %qD must have an "
10244 "initializer", decl);
10245 constexpr_p = false;
10252 error ("non-static data member %qE declared %<constexpr%>",
10254 constexpr_p = false;
10256 decl = build_decl (input_location,
10257 FIELD_DECL, unqualified_id, type);
10258 DECL_NONADDRESSABLE_P (decl) = bitfield;
10259 if (bitfield && !unqualified_id)
10260 TREE_NO_WARNING (decl) = 1;
10262 if (storage_class == sc_mutable)
10264 DECL_MUTABLE_P (decl) = 1;
10265 storage_class = sc_none;
10270 /* An attempt is being made to initialize a non-static
10271 member. This is new in C++11. */
10272 maybe_warn_cpp0x (CPP0X_NSDMI);
10274 /* If this has been parsed with static storage class, but
10275 errors forced staticp to be cleared, ensure NSDMI is
10277 if (declspecs->storage_class == sc_static)
10278 DECL_INITIAL (decl) = error_mark_node;
10282 bad_specifiers (decl, BSP_FIELD, virtualp,
10283 memfn_quals != TYPE_UNQUALIFIED,
10284 inlinep, friendp, raises != NULL_TREE);
10287 else if (TREE_CODE (type) == FUNCTION_TYPE
10288 || TREE_CODE (type) == METHOD_TYPE)
10290 tree original_name;
10293 if (!unqualified_id)
10294 return error_mark_node;
10296 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10297 original_name = dname;
10299 original_name = unqualified_id;
10301 if (storage_class == sc_auto)
10302 error ("storage class %<auto%> invalid for function %qs", name);
10303 else if (storage_class == sc_register)
10304 error ("storage class %<register%> invalid for function %qs", name);
10306 error ("storage class %<__thread%> invalid for function %qs", name);
10308 if (virt_specifiers)
10309 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10310 /* Function declaration not at top level.
10311 Storage classes other than `extern' are not allowed
10312 and `extern' makes no difference. */
10313 if (! toplevel_bindings_p ()
10314 && (storage_class == sc_static
10315 || declspecs->specs[(int)ds_inline])
10318 if (storage_class == sc_static)
10319 pedwarn (input_location, OPT_pedantic,
10320 "%<static%> specified invalid for function %qs "
10321 "declared out of global scope", name);
10323 pedwarn (input_location, OPT_pedantic,
10324 "%<inline%> specifier invalid for function %qs "
10325 "declared out of global scope", name);
10328 if (ctype == NULL_TREE)
10332 error ("virtual non-class function %qs", name);
10335 else if (sfk == sfk_constructor
10336 || sfk == sfk_destructor)
10338 error (funcdef_flag
10339 ? G_("%qs defined in a non-class scope")
10340 : G_("%qs declared in a non-class scope"), name);
10345 /* Record presence of `static'. */
10346 publicp = (ctype != NULL_TREE
10347 || storage_class == sc_extern
10348 || storage_class != sc_static);
10350 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10351 virtualp, flags, memfn_quals, raises,
10353 publicp, inlinep | (2 * constexpr_p), sfk,
10355 template_count, in_namespace, attrlist,
10356 declarator->id_loc);
10357 if (decl == NULL_TREE)
10358 return error_mark_node;
10362 int invalid_static = 0;
10364 /* Don't allow a static member function in a class, and forbid
10365 declaring main to be static. */
10366 if (TREE_CODE (type) == METHOD_TYPE)
10368 permerror (input_location, "cannot declare member function %qD to have "
10369 "static linkage", decl);
10370 invalid_static = 1;
10372 else if (current_function_decl)
10374 /* FIXME need arm citation */
10375 error ("cannot declare static function inside another function");
10376 invalid_static = 1;
10379 if (invalid_static)
10382 storage_class = sc_none;
10388 /* It's a variable. */
10390 /* An uninitialized decl with `extern' is a reference. */
10391 decl = grokvardecl (type, unqualified_id,
10394 (type_quals & TYPE_QUAL_CONST) != 0,
10395 ctype ? ctype : in_namespace);
10396 bad_specifiers (decl, BSP_VAR, virtualp,
10397 memfn_quals != TYPE_UNQUALIFIED,
10398 inlinep, friendp, raises != NULL_TREE);
10402 DECL_CONTEXT (decl) = ctype;
10405 permerror (input_location, "%<static%> may not be used when defining "
10406 "(as opposed to declaring) a static data member");
10408 storage_class = sc_none;
10410 if (storage_class == sc_register && TREE_STATIC (decl))
10412 error ("static member %qD declared %<register%>", decl);
10413 storage_class = sc_none;
10415 if (storage_class == sc_extern && pedantic)
10417 pedwarn (input_location, OPT_pedantic,
10418 "cannot explicitly declare member %q#D to have "
10419 "extern linkage", decl);
10420 storage_class = sc_none;
10423 else if (constexpr_p && DECL_EXTERNAL (decl))
10425 error ("declaration of constexpr variable %qD is not a definition",
10427 constexpr_p = false;
10431 if (storage_class == sc_extern && initialized && !funcdef_flag)
10433 if (toplevel_bindings_p ())
10435 /* It's common practice (and completely valid) to have a const
10436 be initialized and declared extern. */
10437 if (!(type_quals & TYPE_QUAL_CONST))
10438 warning (0, "%qs initialized and declared %<extern%>", name);
10442 error ("%qs has both %<extern%> and initializer", name);
10443 return error_mark_node;
10447 /* Record `register' declaration for warnings on &
10448 and in case doing stupid register allocation. */
10450 if (storage_class == sc_register)
10451 DECL_REGISTER (decl) = 1;
10452 else if (storage_class == sc_extern)
10453 DECL_THIS_EXTERN (decl) = 1;
10454 else if (storage_class == sc_static)
10455 DECL_THIS_STATIC (decl) = 1;
10457 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10458 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10459 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10461 /* Record constancy and volatility on the DECL itself . There's
10462 no need to do this when processing a template; we'll do this
10463 for the instantiated declaration based on the type of DECL. */
10464 if (!processing_template_decl)
10465 cp_apply_type_quals_to_decl (type_quals, decl);
10471 /* Subroutine of start_function. Ensure that each of the parameter
10472 types (as listed in PARMS) is complete, as is required for a
10473 function definition. */
10476 require_complete_types_for_parms (tree parms)
10478 for (; parms; parms = DECL_CHAIN (parms))
10480 if (dependent_type_p (TREE_TYPE (parms)))
10482 if (!VOID_TYPE_P (TREE_TYPE (parms))
10483 && complete_type_or_else (TREE_TYPE (parms), parms))
10485 relayout_decl (parms);
10486 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10489 /* grokparms or complete_type_or_else will have already issued
10491 TREE_TYPE (parms) = error_mark_node;
10495 /* Returns nonzero if T is a local variable. */
10498 local_variable_p (const_tree t)
10500 if ((TREE_CODE (t) == VAR_DECL
10501 /* A VAR_DECL with a context that is a _TYPE is a static data
10503 && !TYPE_P (CP_DECL_CONTEXT (t))
10504 /* Any other non-local variable must be at namespace scope. */
10505 && !DECL_NAMESPACE_SCOPE_P (t))
10506 || (TREE_CODE (t) == PARM_DECL))
10512 /* Like local_variable_p, but suitable for use as a tree-walking
10516 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10517 void *data ATTRIBUTE_UNUSED)
10519 /* Check DECL_NAME to avoid including temporaries. We don't check
10520 DECL_ARTIFICIAL because we do want to complain about 'this'. */
10521 if (local_variable_p (*tp) && DECL_NAME (*tp))
10523 else if (TYPE_P (*tp))
10524 *walk_subtrees = 0;
10529 /* Check that ARG, which is a default-argument expression for a
10530 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10531 something goes wrong. DECL may also be a _TYPE node, rather than a
10532 DECL, if there is no DECL available. */
10535 check_default_argument (tree decl, tree arg)
10540 if (TREE_CODE (arg) == DEFAULT_ARG)
10541 /* We get a DEFAULT_ARG when looking at an in-class declaration
10542 with a default argument. Ignore the argument for now; we'll
10543 deal with it after the class is complete. */
10552 decl_type = TREE_TYPE (decl);
10554 if (arg == error_mark_node
10555 || decl == error_mark_node
10556 || TREE_TYPE (arg) == error_mark_node
10557 || decl_type == error_mark_node)
10558 /* Something already went wrong. There's no need to check
10560 return error_mark_node;
10562 /* [dcl.fct.default]
10564 A default argument expression is implicitly converted to the
10566 if (!TREE_TYPE (arg)
10567 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10570 error ("default argument for %q#D has type %qT",
10571 decl, TREE_TYPE (arg));
10573 error ("default argument for parameter of type %qT has type %qT",
10574 decl_type, TREE_TYPE (arg));
10576 return error_mark_node;
10579 if (warn_zero_as_null_pointer_constant
10580 && c_inhibit_evaluation_warnings == 0
10581 && (POINTER_TYPE_P (decl_type) || TYPE_PTR_TO_MEMBER_P (decl_type))
10582 && null_ptr_cst_p (arg)
10583 && !NULLPTR_TYPE_P (TREE_TYPE (arg)))
10585 warning (OPT_Wzero_as_null_pointer_constant,
10586 "zero as null pointer constant");
10587 return nullptr_node;
10590 /* [dcl.fct.default]
10592 Local variables shall not be used in default argument
10595 The keyword `this' shall not be used in a default argument of a
10596 member function. */
10597 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10600 if (DECL_NAME (var) == this_identifier)
10601 permerror (input_location, "default argument %qE uses %qD", arg, var);
10603 error ("default argument %qE uses local variable %qD", arg, var);
10604 return error_mark_node;
10611 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10614 type_is_deprecated (tree type)
10616 enum tree_code code;
10617 if (TREE_DEPRECATED (type))
10619 if (TYPE_NAME (type)
10620 && TREE_DEPRECATED (TYPE_NAME (type)))
10623 /* Do warn about using typedefs to a deprecated class. */
10624 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10625 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10627 code = TREE_CODE (type);
10629 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10630 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10631 || code == METHOD_TYPE || code == ARRAY_TYPE)
10632 return type_is_deprecated (TREE_TYPE (type));
10634 if (TYPE_PTRMEMFUNC_P (type))
10635 return type_is_deprecated
10636 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10641 /* Decode the list of parameter types for a function type.
10642 Given the list of things declared inside the parens,
10643 return a list of types.
10645 If this parameter does not end with an ellipsis, we append
10648 *PARMS is set to the chain of PARM_DECLs created. */
10651 grokparms (tree parmlist, tree *parms)
10653 tree result = NULL_TREE;
10654 tree decls = NULL_TREE;
10658 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10660 tree type = NULL_TREE;
10661 tree init = TREE_PURPOSE (parm);
10662 tree decl = TREE_VALUE (parm);
10663 const char *errmsg;
10665 if (parm == void_list_node)
10668 if (! decl || TREE_TYPE (decl) == error_mark_node)
10671 type = TREE_TYPE (decl);
10672 if (VOID_TYPE_P (type))
10674 if (same_type_p (type, void_type_node)
10675 && DECL_SELF_REFERENCE_P (type)
10676 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10677 /* this is a parmlist of `(void)', which is ok. */
10679 cxx_incomplete_type_error (decl, type);
10680 /* It's not a good idea to actually create parameters of
10681 type `void'; other parts of the compiler assume that a
10682 void type terminates the parameter list. */
10683 type = error_mark_node;
10684 TREE_TYPE (decl) = error_mark_node;
10687 if (type != error_mark_node
10688 && TYPE_FOR_JAVA (type)
10689 && MAYBE_CLASS_TYPE_P (type))
10691 error ("parameter %qD has Java class type", decl);
10692 type = error_mark_node;
10693 TREE_TYPE (decl) = error_mark_node;
10697 if (type != error_mark_node
10698 && (errmsg = targetm.invalid_parameter_type (type)))
10701 type = error_mark_node;
10702 TREE_TYPE (decl) = error_mark_node;
10705 if (type != error_mark_node)
10707 if (deprecated_state != DEPRECATED_SUPPRESS)
10709 tree deptype = type_is_deprecated (type);
10711 warn_deprecated_use (deptype, NULL_TREE);
10714 /* Top-level qualifiers on the parameters are
10715 ignored for function types. */
10716 type = cp_build_qualified_type (type, 0);
10717 if (TREE_CODE (type) == METHOD_TYPE)
10719 error ("parameter %qD invalidly declared method type", decl);
10720 type = build_pointer_type (type);
10721 TREE_TYPE (decl) = type;
10723 else if (abstract_virtuals_error (decl, type))
10724 any_error = 1; /* Seems like a good idea. */
10725 else if (POINTER_TYPE_P (type))
10727 /* [dcl.fct]/6, parameter types cannot contain pointers
10728 (references) to arrays of unknown bound. */
10729 tree t = TREE_TYPE (type);
10730 int ptr = TYPE_PTR_P (type);
10734 if (TYPE_PTR_P (t))
10736 else if (TREE_CODE (t) != ARRAY_TYPE)
10738 else if (!TYPE_DOMAIN (t))
10742 if (TREE_CODE (t) == ARRAY_TYPE)
10744 ? G_("parameter %qD includes pointer to array of "
10745 "unknown bound %qT")
10746 : G_("parameter %qD includes reference to array of "
10747 "unknown bound %qT"),
10753 else if (init && !processing_template_decl)
10754 init = check_default_argument (decl, init);
10757 DECL_CHAIN (decl) = decls;
10759 result = tree_cons (init, type, result);
10761 decls = nreverse (decls);
10762 result = nreverse (result);
10764 result = chainon (result, void_list_node);
10771 /* D is a constructor or overloaded `operator='.
10773 Let T be the class in which D is declared. Then, this function
10776 -1 if D's is an ill-formed constructor or copy assignment operator
10777 whose first parameter is of type `T'.
10778 0 if D is not a copy constructor or copy assignment
10780 1 if D is a copy constructor or copy assignment operator whose
10781 first parameter is a reference to non-const qualified T.
10782 2 if D is a copy constructor or copy assignment operator whose
10783 first parameter is a reference to const qualified T.
10785 This function can be used as a predicate. Positive values indicate
10786 a copy constructor and nonzero values indicate a copy assignment
10790 copy_fn_p (const_tree d)
10796 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10798 if (TREE_CODE (d) == TEMPLATE_DECL
10799 || (DECL_TEMPLATE_INFO (d)
10800 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10801 /* Instantiations of template member functions are never copy
10802 functions. Note that member functions of templated classes are
10803 represented as template functions internally, and we must
10804 accept those as copy functions. */
10807 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10811 arg_type = TREE_VALUE (args);
10812 if (arg_type == error_mark_node)
10815 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10817 /* Pass by value copy assignment operator. */
10820 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10821 && !TYPE_REF_IS_RVALUE (arg_type)
10822 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10824 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10830 args = TREE_CHAIN (args);
10832 if (args && args != void_list_node && !TREE_PURPOSE (args))
10833 /* There are more non-optional args. */
10839 /* D is a constructor or overloaded `operator='.
10841 Let T be the class in which D is declared. Then, this function
10842 returns true when D is a move constructor or move assignment
10843 operator, false otherwise. */
10846 move_fn_p (const_tree d)
10850 bool result = false;
10852 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10854 if (cxx_dialect == cxx98)
10855 /* There are no move constructors if we are in C++98 mode. */
10858 if (TREE_CODE (d) == TEMPLATE_DECL
10859 || (DECL_TEMPLATE_INFO (d)
10860 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10861 /* Instantiations of template member functions are never copy
10862 functions. Note that member functions of templated classes are
10863 represented as template functions internally, and we must
10864 accept those as copy functions. */
10867 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10871 arg_type = TREE_VALUE (args);
10872 if (arg_type == error_mark_node)
10875 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10876 && TYPE_REF_IS_RVALUE (arg_type)
10877 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10881 args = TREE_CHAIN (args);
10883 if (args && args != void_list_node && !TREE_PURPOSE (args))
10884 /* There are more non-optional args. */
10890 /* Remember any special properties of member function DECL. */
10893 grok_special_member_properties (tree decl)
10897 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10900 class_type = DECL_CONTEXT (decl);
10901 if (DECL_CONSTRUCTOR_P (decl))
10903 int ctor = copy_fn_p (decl);
10905 if (!DECL_ARTIFICIAL (decl))
10906 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10912 A non-template constructor for class X is a copy
10913 constructor if its first parameter is of type X&, const
10914 X&, volatile X& or const volatile X&, and either there
10915 are no other parameters or else all other parameters have
10916 default arguments. */
10917 TYPE_HAS_COPY_CTOR (class_type) = 1;
10918 if (user_provided_p (decl))
10919 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10921 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10923 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10925 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10926 if (user_provided_p (decl))
10927 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10929 else if (move_fn_p (decl) && user_provided_p (decl))
10930 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10931 else if (is_list_ctor (decl))
10932 TYPE_HAS_LIST_CTOR (class_type) = 1;
10934 if (DECL_DECLARED_CONSTEXPR_P (decl)
10935 && !copy_fn_p (decl) && !move_fn_p (decl))
10936 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10938 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10942 A non-template assignment operator for class X is a copy
10943 assignment operator if its parameter is of type X, X&, const
10944 X&, volatile X& or const volatile X&. */
10946 int assop = copy_fn_p (decl);
10950 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10951 if (user_provided_p (decl))
10952 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10954 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10956 else if (move_fn_p (decl) && user_provided_p (decl))
10957 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10959 /* Destructors are handled in check_methods. */
10962 /* Check a constructor DECL has the correct form. Complains
10963 if the class has a constructor of the form X(X). */
10966 grok_ctor_properties (const_tree ctype, const_tree decl)
10968 int ctor_parm = copy_fn_p (decl);
10974 A declaration of a constructor for a class X is ill-formed if
10975 its first parameter is of type (optionally cv-qualified) X
10976 and either there are no other parameters or else all other
10977 parameters have default arguments.
10979 We *don't* complain about member template instantiations that
10980 have this form, though; they can occur as we try to decide
10981 what constructor to use during overload resolution. Since
10982 overload resolution will never prefer such a constructor to
10983 the non-template copy constructor (which is either explicitly
10984 or implicitly defined), there's no need to worry about their
10985 existence. Theoretically, they should never even be
10986 instantiated, but that's hard to forestall. */
10987 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10995 /* An operator with this code is unary, but can also be binary. */
10998 ambi_op_p (enum tree_code code)
11000 return (code == INDIRECT_REF
11001 || code == ADDR_EXPR
11002 || code == UNARY_PLUS_EXPR
11003 || code == NEGATE_EXPR
11004 || code == PREINCREMENT_EXPR
11005 || code == PREDECREMENT_EXPR);
11008 /* An operator with this name can only be unary. */
11011 unary_op_p (enum tree_code code)
11013 return (code == TRUTH_NOT_EXPR
11014 || code == BIT_NOT_EXPR
11015 || code == COMPONENT_REF
11016 || code == TYPE_EXPR);
11019 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11020 errors are issued for invalid declarations. */
11023 grok_op_properties (tree decl, bool complain)
11025 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11027 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11028 tree name = DECL_NAME (decl);
11029 enum tree_code operator_code;
11034 /* Count the number of arguments and check for ellipsis. */
11035 for (argtype = argtypes, arity = 0;
11036 argtype && argtype != void_list_node;
11037 argtype = TREE_CHAIN (argtype))
11039 ellipsis_p = !argtype;
11041 class_type = DECL_CONTEXT (decl);
11042 if (class_type && !CLASS_TYPE_P (class_type))
11043 class_type = NULL_TREE;
11045 if (DECL_CONV_FN_P (decl))
11046 operator_code = TYPE_EXPR;
11050 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11051 if (ansi_opname (CODE) == name) \
11053 operator_code = (CODE); \
11056 else if (ansi_assopname (CODE) == name) \
11058 operator_code = (CODE); \
11059 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11063 #include "operators.def"
11064 #undef DEF_OPERATOR
11066 gcc_unreachable ();
11069 gcc_assert (operator_code != MAX_TREE_CODES);
11070 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11073 switch (operator_code)
11076 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11080 TYPE_GETS_DELETE (class_type) |= 1;
11084 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11087 case VEC_DELETE_EXPR:
11088 TYPE_GETS_DELETE (class_type) |= 2;
11095 /* [basic.std.dynamic.allocation]/1:
11097 A program is ill-formed if an allocation function is declared
11098 in a namespace scope other than global scope or declared static
11101 The same also holds true for deallocation functions. */
11102 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11103 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11105 if (DECL_NAMESPACE_SCOPE_P (decl))
11107 if (CP_DECL_CONTEXT (decl) != global_namespace)
11109 error ("%qD may not be declared within a namespace", decl);
11112 else if (!TREE_PUBLIC (decl))
11114 error ("%qD may not be declared as static", decl);
11120 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11122 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11123 DECL_IS_OPERATOR_NEW (decl) = 1;
11125 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11126 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11129 /* An operator function must either be a non-static member function
11130 or have at least one parameter of a class, a reference to a class,
11131 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11132 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11134 if (operator_code == TYPE_EXPR
11135 || operator_code == CALL_EXPR
11136 || operator_code == COMPONENT_REF
11137 || operator_code == ARRAY_REF
11138 || operator_code == NOP_EXPR)
11140 error ("%qD must be a nonstatic member function", decl);
11147 if (DECL_STATIC_FUNCTION_P (decl))
11149 error ("%qD must be either a non-static member "
11150 "function or a non-member function", decl);
11154 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11156 tree arg = non_reference (TREE_VALUE (p));
11157 if (arg == error_mark_node)
11160 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11161 because these checks are performed even on
11162 template functions. */
11163 if (MAYBE_CLASS_TYPE_P (arg)
11164 || TREE_CODE (arg) == ENUMERAL_TYPE)
11168 if (!p || p == void_list_node)
11171 error ("%qD must have an argument of class or "
11172 "enumerated type", decl);
11178 /* There are no restrictions on the arguments to an overloaded
11180 if (operator_code == CALL_EXPR)
11183 /* Warn about conversion operators that will never be used. */
11184 if (IDENTIFIER_TYPENAME_P (name)
11185 && ! DECL_TEMPLATE_INFO (decl)
11187 /* Warn only declaring the function; there is no need to
11188 warn again about out-of-class definitions. */
11189 && class_type == current_class_type)
11191 tree t = TREE_TYPE (name);
11192 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11195 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11197 if (TREE_CODE (t) == VOID_TYPE)
11198 warning (OPT_Wconversion,
11200 ? G_("conversion to a reference to void "
11201 "will never use a type conversion operator")
11202 : G_("conversion to void "
11203 "will never use a type conversion operator"));
11204 else if (class_type)
11206 if (t == class_type)
11207 warning (OPT_Wconversion,
11209 ? G_("conversion to a reference to the same type "
11210 "will never use a type conversion operator")
11211 : G_("conversion to the same type "
11212 "will never use a type conversion operator"));
11213 /* Don't force t to be complete here. */
11214 else if (MAYBE_CLASS_TYPE_P (t)
11215 && COMPLETE_TYPE_P (t)
11216 && DERIVED_FROM_P (t, class_type))
11217 warning (OPT_Wconversion,
11219 ? G_("conversion to a reference to a base class "
11220 "will never use a type conversion operator")
11221 : G_("conversion to a base class "
11222 "will never use a type conversion operator"));
11227 if (operator_code == COND_EXPR)
11230 error ("ISO C++ prohibits overloading operator ?:");
11233 else if (ellipsis_p)
11235 error ("%qD must not have variable number of arguments", decl);
11238 else if (ambi_op_p (operator_code))
11241 /* We pick the one-argument operator codes by default, so
11242 we don't have to change anything. */
11244 else if (arity == 2)
11246 /* If we thought this was a unary operator, we now know
11247 it to be a binary operator. */
11248 switch (operator_code)
11251 operator_code = MULT_EXPR;
11255 operator_code = BIT_AND_EXPR;
11258 case UNARY_PLUS_EXPR:
11259 operator_code = PLUS_EXPR;
11263 operator_code = MINUS_EXPR;
11266 case PREINCREMENT_EXPR:
11267 operator_code = POSTINCREMENT_EXPR;
11270 case PREDECREMENT_EXPR:
11271 operator_code = POSTDECREMENT_EXPR;
11275 gcc_unreachable ();
11278 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11280 if ((operator_code == POSTINCREMENT_EXPR
11281 || operator_code == POSTDECREMENT_EXPR)
11282 && ! processing_template_decl
11283 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11286 error ("postfix %qD must take %<int%> as its argument",
11289 error ("postfix %qD must take %<int%> as its second "
11297 error ("%qD must take either zero or one argument", decl);
11299 error ("%qD must take either one or two arguments", decl);
11303 /* More Effective C++ rule 6. */
11305 && (operator_code == POSTINCREMENT_EXPR
11306 || operator_code == POSTDECREMENT_EXPR
11307 || operator_code == PREINCREMENT_EXPR
11308 || operator_code == PREDECREMENT_EXPR))
11310 tree arg = TREE_VALUE (argtypes);
11311 tree ret = TREE_TYPE (TREE_TYPE (decl));
11312 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11313 arg = TREE_TYPE (arg);
11314 arg = TYPE_MAIN_VARIANT (arg);
11315 if (operator_code == PREINCREMENT_EXPR
11316 || operator_code == PREDECREMENT_EXPR)
11318 if (TREE_CODE (ret) != REFERENCE_TYPE
11319 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11321 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11322 build_reference_type (arg));
11326 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11327 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11331 else if (unary_op_p (operator_code))
11336 error ("%qD must take %<void%>", decl);
11338 error ("%qD must take exactly one argument", decl);
11342 else /* if (binary_op_p (operator_code)) */
11347 error ("%qD must take exactly one argument", decl);
11349 error ("%qD must take exactly two arguments", decl);
11353 /* More Effective C++ rule 7. */
11355 && (operator_code == TRUTH_ANDIF_EXPR
11356 || operator_code == TRUTH_ORIF_EXPR
11357 || operator_code == COMPOUND_EXPR))
11358 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11362 /* Effective C++ rule 23. */
11365 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11366 && (operator_code == PLUS_EXPR
11367 || operator_code == MINUS_EXPR
11368 || operator_code == TRUNC_DIV_EXPR
11369 || operator_code == MULT_EXPR
11370 || operator_code == TRUNC_MOD_EXPR)
11371 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11372 warning (OPT_Weffc__, "%qD should return by value", decl);
11374 /* [over.oper]/8 */
11375 for (; argtypes && argtypes != void_list_node;
11376 argtypes = TREE_CHAIN (argtypes))
11377 if (TREE_PURPOSE (argtypes))
11379 TREE_PURPOSE (argtypes) = NULL_TREE;
11380 if (operator_code == POSTINCREMENT_EXPR
11381 || operator_code == POSTDECREMENT_EXPR)
11383 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11388 error ("%qD cannot have default arguments", decl);
11396 /* Return a string giving the keyword associate with CODE. */
11398 static const char *
11399 tag_name (enum tag_types code)
11411 case typename_type:
11414 gcc_unreachable ();
11418 /* Name lookup in an elaborated-type-specifier (after the keyword
11419 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11420 elaborated-type-specifier is invalid, issue a diagnostic and return
11421 error_mark_node; otherwise, return the *_TYPE to which it referred.
11422 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11425 check_elaborated_type_specifier (enum tag_types tag_code,
11427 bool allow_template_p)
11431 if (decl == error_mark_node)
11432 return error_mark_node;
11436 struct S { struct S *p; };
11438 name lookup will find the TYPE_DECL for the implicit "S::S"
11439 typedef. Adjust for that here. */
11440 if (DECL_SELF_REFERENCE_P (decl))
11441 decl = TYPE_NAME (TREE_TYPE (decl));
11443 type = TREE_TYPE (decl);
11445 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11446 is false for this case as well. */
11447 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11449 error ("using template type parameter %qT after %qs",
11450 type, tag_name (tag_code));
11451 return error_mark_node;
11453 /* Accept bound template template parameters. */
11454 else if (allow_template_p
11455 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11459 If the identifier resolves to a typedef-name or the
11460 simple-template-id resolves to an alias template
11461 specialization, the elaborated-type-specifier is ill-formed.
11463 In other words, the only legitimate declaration to use in the
11464 elaborated type specifier is the implicit typedef created when
11465 the type is declared. */
11466 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11467 && !DECL_SELF_REFERENCE_P (decl)
11468 && tag_code != typename_type)
11470 if (alias_template_specialization_p (type))
11471 error ("using alias template specialization %qT after %qs",
11472 type, tag_name (tag_code));
11474 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11475 inform (DECL_SOURCE_LOCATION (decl),
11476 "%qD has a previous declaration here", decl);
11477 return error_mark_node;
11479 else if (TREE_CODE (type) != RECORD_TYPE
11480 && TREE_CODE (type) != UNION_TYPE
11481 && tag_code != enum_type
11482 && tag_code != typename_type)
11484 error ("%qT referred to as %qs", type, tag_name (tag_code));
11485 error ("%q+T has a previous declaration here", type);
11486 return error_mark_node;
11488 else if (TREE_CODE (type) != ENUMERAL_TYPE
11489 && tag_code == enum_type)
11491 error ("%qT referred to as enum", type);
11492 error ("%q+T has a previous declaration here", type);
11493 return error_mark_node;
11495 else if (!allow_template_p
11496 && TREE_CODE (type) == RECORD_TYPE
11497 && CLASSTYPE_IS_TEMPLATE (type))
11499 /* If a class template appears as elaborated type specifier
11500 without a template header such as:
11502 template <class T> class C {};
11503 void f(class C); // No template header here
11505 then the required template argument is missing. */
11506 error ("template argument required for %<%s %T%>",
11507 tag_name (tag_code),
11508 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11509 return error_mark_node;
11515 /* Lookup NAME in elaborate type specifier in scope according to
11516 SCOPE and issue diagnostics if necessary.
11517 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11518 found, and ERROR_MARK_NODE for type error. */
11521 lookup_and_check_tag (enum tag_types tag_code, tree name,
11522 tag_scope scope, bool template_header_p)
11526 if (scope == ts_global)
11528 /* First try ordinary name lookup, ignoring hidden class name
11529 injected via friend declaration. */
11530 decl = lookup_name_prefer_type (name, 2);
11531 /* If that fails, the name will be placed in the smallest
11532 non-class, non-function-prototype scope according to 3.3.1/5.
11533 We may already have a hidden name declared as friend in this
11534 scope. So lookup again but not ignoring hidden names.
11535 If we find one, that name will be made visible rather than
11536 creating a new tag. */
11538 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11541 decl = lookup_type_scope (name, scope);
11543 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11544 decl = DECL_TEMPLATE_RESULT (decl);
11546 if (decl && TREE_CODE (decl) == TYPE_DECL)
11548 /* Look for invalid nested type:
11552 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11554 error ("%qD has the same name as the class in which it is "
11557 return error_mark_node;
11560 /* Two cases we need to consider when deciding if a class
11561 template is allowed as an elaborated type specifier:
11562 1. It is a self reference to its own class.
11563 2. It comes with a template header.
11567 template <class T> class C {
11568 class C *c1; // DECL_SELF_REFERENCE_P is true
11571 template <class U> class C; // template_header_p is true
11572 template <class T> class C<T>::D {
11573 class C *c2; // DECL_SELF_REFERENCE_P is true
11576 t = check_elaborated_type_specifier (tag_code,
11579 | DECL_SELF_REFERENCE_P (decl));
11582 else if (decl && TREE_CODE (decl) == TREE_LIST)
11584 error ("reference to %qD is ambiguous", name);
11585 print_candidates (decl);
11586 return error_mark_node;
11592 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11593 Define the tag as a forward-reference if it is not defined.
11595 If a declaration is given, process it here, and report an error if
11596 multiple declarations are not identical.
11598 SCOPE is TS_CURRENT when this is also a definition. Only look in
11599 the current frame for the name (since C++ allows new names in any
11600 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11601 declaration. Only look beginning from the current scope outward up
11602 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11604 TEMPLATE_HEADER_P is true when this declaration is preceded by
11605 a set of template parameters. */
11608 xref_tag_1 (enum tag_types tag_code, tree name,
11609 tag_scope scope, bool template_header_p)
11611 enum tree_code code;
11613 tree context = NULL_TREE;
11615 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11621 code = RECORD_TYPE;
11627 code = ENUMERAL_TYPE;
11630 gcc_unreachable ();
11633 /* In case of anonymous name, xref_tag is only called to
11634 make type node and push name. Name lookup is not required. */
11635 if (ANON_AGGRNAME_P (name))
11638 t = lookup_and_check_tag (tag_code, name,
11639 scope, template_header_p);
11641 if (t == error_mark_node)
11642 return error_mark_node;
11644 if (scope != ts_current && t && current_class_type
11645 && template_class_depth (current_class_type)
11646 && template_header_p)
11648 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11649 definition of this tag. Since, in addition, we are currently
11650 processing a (member) template declaration of a template
11651 class, we must be very careful; consider:
11658 { template <class V>
11659 friend struct S1; };
11661 Here, the S2::S1 declaration should not be confused with the
11662 outer declaration. In particular, the inner version should
11663 have a template parameter of level 2, not level 1. This
11664 would be particularly important if the member declaration
11667 template <class V = U> friend struct S1;
11669 say, when we should tsubst into `U' when instantiating
11670 S2. On the other hand, when presented with:
11680 we must find the inner binding eventually. We
11681 accomplish this by making sure that the new type we
11682 create to represent this declaration has the right
11684 context = TYPE_CONTEXT (t);
11690 /* If no such tag is yet defined, create a forward-reference node
11691 and record it as the "definition".
11692 When a real declaration of this type is found,
11693 the forward-reference will be altered into a real type. */
11694 if (code == ENUMERAL_TYPE)
11696 error ("use of enum %q#D without previous declaration", name);
11697 return error_mark_node;
11701 t = make_class_type (code);
11702 TYPE_CONTEXT (t) = context;
11703 t = pushtag (name, t, scope);
11708 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11710 if (!redeclare_class_template (t, current_template_parms))
11711 return error_mark_node;
11713 else if (!processing_template_decl
11714 && CLASS_TYPE_P (t)
11715 && CLASSTYPE_IS_TEMPLATE (t))
11717 error ("redeclaration of %qT as a non-template", t);
11718 error ("previous declaration %q+D", t);
11719 return error_mark_node;
11722 /* Make injected friend class visible. */
11723 if (scope != ts_within_enclosing_non_class
11724 && hidden_name_p (TYPE_NAME (t)))
11726 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11727 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11729 if (TYPE_TEMPLATE_INFO (t))
11731 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11732 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11740 /* Wrapper for xref_tag_1. */
11743 xref_tag (enum tag_types tag_code, tree name,
11744 tag_scope scope, bool template_header_p)
11748 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11749 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11750 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11756 xref_tag_from_type (tree old, tree id, tag_scope scope)
11758 enum tag_types tag_kind;
11760 if (TREE_CODE (old) == RECORD_TYPE)
11761 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11763 tag_kind = union_type;
11765 if (id == NULL_TREE)
11766 id = TYPE_IDENTIFIER (old);
11768 return xref_tag (tag_kind, id, scope, false);
11771 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11772 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11773 access_* node, and the TREE_VALUE is the type of the base-class.
11774 Non-NULL TREE_TYPE indicates virtual inheritance.
11776 Returns true if the binfo hierarchy was successfully created,
11777 false if an error was detected. */
11780 xref_basetypes (tree ref, tree base_list)
11783 tree binfo, base_binfo;
11784 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11785 unsigned max_bases = 0; /* Maximum direct bases. */
11787 tree default_access;
11788 tree igo_prev; /* Track Inheritance Graph Order. */
11790 if (ref == error_mark_node)
11793 /* The base of a derived class is private by default, all others are
11795 default_access = (TREE_CODE (ref) == RECORD_TYPE
11796 && CLASSTYPE_DECLARED_CLASS (ref)
11797 ? access_private_node : access_public_node);
11799 /* First, make sure that any templates in base-classes are
11800 instantiated. This ensures that if we call ourselves recursively
11801 we do not get confused about which classes are marked and which
11803 basep = &base_list;
11806 tree basetype = TREE_VALUE (*basep);
11808 if (!(processing_template_decl && uses_template_parms (basetype))
11809 && !complete_type_or_else (basetype, NULL))
11810 /* An incomplete type. Remove it from the list. */
11811 *basep = TREE_CHAIN (*basep);
11815 if (TREE_TYPE (*basep))
11817 if (CLASS_TYPE_P (basetype))
11818 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11819 basep = &TREE_CHAIN (*basep);
11823 TYPE_MARKED_P (ref) = 1;
11825 /* The binfo slot should be empty, unless this is an (ill-formed)
11827 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11829 error ("redefinition of %q#T", ref);
11833 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11835 binfo = make_tree_binfo (max_bases);
11837 TYPE_BINFO (ref) = binfo;
11838 BINFO_OFFSET (binfo) = size_zero_node;
11839 BINFO_TYPE (binfo) = ref;
11841 /* Apply base-class info set up to the variants of this type. */
11842 fixup_type_variants (ref);
11846 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11847 /* An aggregate cannot have baseclasses. */
11848 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11850 if (TREE_CODE (ref) == UNION_TYPE)
11852 error ("derived union %qT invalid", ref);
11859 if (TYPE_FOR_JAVA (ref))
11861 error ("Java class %qT cannot have multiple bases", ref);
11868 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11870 if (TYPE_FOR_JAVA (ref))
11872 error ("Java class %qT cannot have virtual bases", ref);
11877 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11879 tree access = TREE_PURPOSE (base_list);
11880 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11881 tree basetype = TREE_VALUE (base_list);
11883 if (access == access_default_node)
11884 access = default_access;
11886 if (PACK_EXPANSION_P (basetype))
11887 basetype = PACK_EXPANSION_PATTERN (basetype);
11888 if (TREE_CODE (basetype) == TYPE_DECL)
11889 basetype = TREE_TYPE (basetype);
11890 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11892 error ("base type %qT fails to be a struct or class type",
11897 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11898 TYPE_FOR_JAVA (ref) = 1;
11900 base_binfo = NULL_TREE;
11901 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
11903 base_binfo = TYPE_BINFO (basetype);
11904 /* The original basetype could have been a typedef'd type. */
11905 basetype = BINFO_TYPE (base_binfo);
11907 /* Inherit flags from the base. */
11908 TYPE_HAS_NEW_OPERATOR (ref)
11909 |= TYPE_HAS_NEW_OPERATOR (basetype);
11910 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11911 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11912 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11913 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11914 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11915 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11916 CLASSTYPE_REPEATED_BASE_P (ref)
11917 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11920 /* We must do this test after we've seen through a typedef
11922 if (TYPE_MARKED_P (basetype))
11924 if (basetype == ref)
11925 error ("recursive type %qT undefined", basetype);
11927 error ("duplicate base type %qT invalid", basetype);
11931 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11932 /* Regenerate the pack expansion for the bases. */
11933 basetype = make_pack_expansion (basetype);
11935 TYPE_MARKED_P (basetype) = 1;
11937 base_binfo = copy_binfo (base_binfo, basetype, ref,
11938 &igo_prev, via_virtual);
11939 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11940 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11942 BINFO_BASE_APPEND (binfo, base_binfo);
11943 BINFO_BASE_ACCESS_APPEND (binfo, access);
11946 if (VEC_length (tree, CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
11947 /* If we didn't get max_vbases vbases, we must have shared at
11948 least one of them, and are therefore diamond shaped. */
11949 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11951 /* Unmark all the types. */
11952 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11953 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11954 TYPE_MARKED_P (ref) = 0;
11956 /* Now see if we have a repeated base type. */
11957 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11959 for (base_binfo = binfo; base_binfo;
11960 base_binfo = TREE_CHAIN (base_binfo))
11962 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11964 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11967 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11969 for (base_binfo = binfo; base_binfo;
11970 base_binfo = TREE_CHAIN (base_binfo))
11971 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11972 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11981 /* Copies the enum-related properties from type SRC to type DST.
11982 Used with the underlying type of an enum and the enum itself. */
11984 copy_type_enum (tree dst, tree src)
11987 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
11989 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
11990 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
11991 TYPE_SIZE (t) = TYPE_SIZE (src);
11992 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
11993 SET_TYPE_MODE (dst, TYPE_MODE (src));
11994 TYPE_PRECISION (t) = TYPE_PRECISION (src);
11995 TYPE_ALIGN (t) = TYPE_ALIGN (src);
11996 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
11997 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
12001 /* Begin compiling the definition of an enumeration type.
12004 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
12006 UNDERLYING_TYPE is the type that will be used as the storage for
12007 the enumeration type. This should be NULL_TREE if no storage type
12010 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12012 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12014 Returns the type object, as yet incomplete.
12015 Also records info about it so that build_enumerator
12016 may be used to declare the individual values as they are read. */
12019 start_enum (tree name, tree enumtype, tree underlying_type,
12020 bool scoped_enum_p, bool *is_new)
12022 tree prevtype = NULL_TREE;
12023 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
12027 /* [C++0x dcl.enum]p5:
12029 If not explicitly specified, the underlying type of a scoped
12030 enumeration type is int. */
12031 if (!underlying_type && scoped_enum_p)
12032 underlying_type = integer_type_node;
12034 if (underlying_type)
12035 underlying_type = cv_unqualified (underlying_type);
12037 /* If this is the real definition for a previous forward reference,
12038 fill in the contents in the same object that used to be the
12039 forward reference. */
12041 enumtype = lookup_and_check_tag (enum_type, name,
12042 /*tag_scope=*/ts_current,
12043 /*template_header_p=*/false);
12045 /* In case of a template_decl, the only check that should be deferred
12046 to instantiation time is the comparison of underlying types. */
12047 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12049 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12051 error_at (input_location, "scoped/unscoped mismatch "
12052 "in enum %q#T", enumtype);
12053 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12054 "previous definition here");
12055 enumtype = error_mark_node;
12057 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12059 error_at (input_location, "underlying type mismatch "
12060 "in enum %q#T", enumtype);
12061 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12062 "previous definition here");
12063 enumtype = error_mark_node;
12065 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12066 && !dependent_type_p (underlying_type)
12067 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12068 && !same_type_p (underlying_type,
12069 ENUM_UNDERLYING_TYPE (enumtype)))
12071 error_at (input_location, "different underlying type "
12072 "in enum %q#T", enumtype);
12073 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12074 "previous definition here");
12075 underlying_type = NULL_TREE;
12079 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12080 || processing_template_decl)
12082 /* In case of error, make a dummy enum to allow parsing to
12084 if (enumtype == error_mark_node)
12086 name = make_anon_name ();
12087 enumtype = NULL_TREE;
12090 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12091 of an opaque enum, or an opaque enum of an already defined
12092 enumeration (C++0x only).
12093 In any other case, it'll be NULL_TREE. */
12099 prevtype = enumtype;
12101 /* Do not push the decl more than once, unless we need to
12102 compare underlying types at instantiation time */
12104 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12105 || (underlying_type
12106 && dependent_type_p (underlying_type))
12107 || (ENUM_UNDERLYING_TYPE (enumtype)
12108 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12110 enumtype = cxx_make_type (ENUMERAL_TYPE);
12111 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12114 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12117 if (enumtype == error_mark_node)
12118 return error_mark_node;
12120 /* The enum is considered opaque until the opening '{' of the
12121 enumerator list. */
12122 SET_OPAQUE_ENUM_P (enumtype, true);
12123 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12126 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12128 if (underlying_type)
12130 if (CP_INTEGRAL_TYPE_P (underlying_type))
12132 copy_type_enum (enumtype, underlying_type);
12133 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12135 else if (dependent_type_p (underlying_type))
12136 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12138 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12139 underlying_type, enumtype);
12142 /* If into a template class, the returned enum is always the first
12143 declaration (opaque or not) seen. This way all the references to
12144 this type will be to the same declaration. The following ones are used
12145 only to check for definition errors. */
12146 if (prevtype && processing_template_decl)
12152 /* After processing and defining all the values of an enumeration type,
12153 install their decls in the enumeration type.
12154 ENUMTYPE is the type object. */
12157 finish_enum_value_list (tree enumtype)
12160 tree underlying_type;
12163 tree minnode, maxnode;
12166 bool fixed_underlying_type_p
12167 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12169 /* We built up the VALUES in reverse order. */
12170 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12172 /* For an enum defined in a template, just set the type of the values;
12173 all further processing is postponed until the template is
12174 instantiated. We need to set the type so that tsubst of a CONST_DECL
12176 if (processing_template_decl)
12178 for (values = TYPE_VALUES (enumtype);
12180 values = TREE_CHAIN (values))
12181 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12185 /* Determine the minimum and maximum values of the enumerators. */
12186 if (TYPE_VALUES (enumtype))
12188 minnode = maxnode = NULL_TREE;
12190 for (values = TYPE_VALUES (enumtype);
12192 values = TREE_CHAIN (values))
12194 decl = TREE_VALUE (values);
12196 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12197 each enumerator has the type of its enumeration. Prior to the
12198 closing brace, the type of each enumerator is the type of its
12199 initializing value. */
12200 TREE_TYPE (decl) = enumtype;
12202 /* Update the minimum and maximum values, if appropriate. */
12203 value = DECL_INITIAL (decl);
12204 if (value == error_mark_node)
12205 value = integer_zero_node;
12206 /* Figure out what the minimum and maximum values of the
12207 enumerators are. */
12209 minnode = maxnode = value;
12210 else if (tree_int_cst_lt (maxnode, value))
12212 else if (tree_int_cst_lt (value, minnode))
12219 If the enumerator-list is empty, the underlying type is as if
12220 the enumeration had a single enumerator with value 0. */
12221 minnode = maxnode = integer_zero_node;
12223 if (!fixed_underlying_type_p)
12225 /* Compute the number of bits require to represent all values of the
12226 enumeration. We must do this before the type of MINNODE and
12227 MAXNODE are transformed, since tree_int_cst_min_precision relies
12228 on the TREE_TYPE of the value it is passed. */
12229 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12230 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12231 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12232 int precision = MAX (lowprec, highprec);
12234 bool use_short_enum;
12236 /* Determine the underlying type of the enumeration.
12240 The underlying type of an enumeration is an integral type that
12241 can represent all the enumerator values defined in the
12242 enumeration. It is implementation-defined which integral type is
12243 used as the underlying type for an enumeration except that the
12244 underlying type shall not be larger than int unless the value of
12245 an enumerator cannot fit in an int or unsigned int.
12247 We use "int" or an "unsigned int" as the underlying type, even if
12248 a smaller integral type would work, unless the user has
12249 explicitly requested that we use the smallest possible type. The
12250 user can request that for all enumerations with a command line
12251 flag, or for just one enumeration with an attribute. */
12253 use_short_enum = flag_short_enums
12254 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12256 for (itk = (use_short_enum ? itk_char : itk_int);
12260 underlying_type = integer_types[itk];
12261 if (underlying_type != NULL_TREE
12262 && TYPE_PRECISION (underlying_type) >= precision
12263 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12266 if (itk == itk_none)
12270 IF no integral type can represent all the enumerator values, the
12271 enumeration is ill-formed. */
12272 error ("no integral type can represent all of the enumerator values "
12273 "for %qT", enumtype);
12274 precision = TYPE_PRECISION (long_long_integer_type_node);
12275 underlying_type = integer_types[itk_unsigned_long_long];
12280 The value of sizeof() applied to an enumeration type, an object
12281 of an enumeration type, or an enumerator, is the value of sizeof()
12282 applied to the underlying type. */
12283 copy_type_enum (enumtype, underlying_type);
12285 /* Compute the minimum and maximum values for the type.
12289 For an enumeration where emin is the smallest enumerator and emax
12290 is the largest, the values of the enumeration are the values of the
12291 underlying type in the range bmin to bmax, where bmin and bmax are,
12292 respectively, the smallest and largest values of the smallest bit-
12293 field that can store emin and emax. */
12295 /* The middle-end currently assumes that types with TYPE_PRECISION
12296 narrower than their underlying type are suitably zero or sign
12297 extended to fill their mode. Similarly, it assumes that the front
12298 end assures that a value of a particular type must be within
12299 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12301 We used to set these fields based on bmin and bmax, but that led
12302 to invalid assumptions like optimizing away bounds checking. So
12303 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12304 TYPE_MAX_VALUE to the values for the mode above and only restrict
12305 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12306 ENUM_UNDERLYING_TYPE (enumtype)
12307 = build_distinct_type_copy (underlying_type);
12308 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12309 set_min_and_max_values_for_integral_type
12310 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12312 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12313 if (flag_strict_enums)
12314 set_min_and_max_values_for_integral_type (enumtype, precision,
12318 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12320 /* Convert each of the enumerators to the type of the underlying
12321 type of the enumeration. */
12322 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12324 location_t saved_location;
12326 decl = TREE_VALUE (values);
12327 saved_location = input_location;
12328 input_location = DECL_SOURCE_LOCATION (decl);
12329 if (fixed_underlying_type_p)
12330 /* If the enumeration type has a fixed underlying type, we
12331 already checked all of the enumerator values. */
12332 value = DECL_INITIAL (decl);
12334 value = perform_implicit_conversion (underlying_type,
12335 DECL_INITIAL (decl),
12336 tf_warning_or_error);
12337 input_location = saved_location;
12339 /* Do not clobber shared ints. */
12340 value = copy_node (value);
12342 TREE_TYPE (value) = enumtype;
12343 DECL_INITIAL (decl) = value;
12346 /* Fix up all variant types of this enum type. */
12347 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12348 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12350 /* Finish debugging output for this type. */
12351 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12354 /* Finishes the enum type. This is called only the first time an
12355 enumeration is seen, be it opaque or odinary.
12356 ENUMTYPE is the type object. */
12359 finish_enum (tree enumtype)
12361 if (processing_template_decl)
12363 if (at_function_scope_p ())
12364 add_stmt (build_min (TAG_DEFN, enumtype));
12368 /* If this is a forward declaration, there should not be any variants,
12369 though we can get a variant in the middle of an enum-specifier with
12370 wacky code like 'enum E { e = sizeof(const E*) };' */
12371 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12372 && (TYPE_VALUES (enumtype)
12373 || !TYPE_NEXT_VARIANT (enumtype)));
12376 /* Build and install a CONST_DECL for an enumeration constant of the
12377 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12378 LOC is the location of NAME.
12379 Assignment of sequential values by default is handled here. */
12382 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12388 /* If the VALUE was erroneous, pretend it wasn't there; that will
12389 result in the enum being assigned the next value in sequence. */
12390 if (value == error_mark_node)
12393 /* Remove no-op casts from the value. */
12395 STRIP_TYPE_NOPS (value);
12397 if (! processing_template_decl)
12399 /* Validate and default VALUE. */
12400 if (value != NULL_TREE)
12402 value = cxx_constant_value (value);
12404 if (TREE_CODE (value) != INTEGER_CST
12405 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12407 error ("enumerator value for %qD is not an integer constant",
12413 /* Default based on previous value. */
12414 if (value == NULL_TREE)
12416 if (TYPE_VALUES (enumtype))
12419 unsigned HOST_WIDE_INT lo;
12423 /* C++03 7.2/4: If no initializer is specified for the first
12424 enumerator, the type is an unspecified integral
12425 type. Otherwise the type is the same as the type of the
12426 initializing value of the preceding enumerator unless the
12427 incremented value is not representable in that type, in
12428 which case the type is an unspecified integral type
12429 sufficient to contain the incremented value. */
12430 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12431 if (error_operand_p (prev_value))
12432 value = error_mark_node;
12435 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12436 TREE_INT_CST_HIGH (prev_value),
12441 tree type = TREE_TYPE (prev_value);
12442 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12443 di.low = lo; di.high = hi;
12444 if (!double_int_fits_to_tree_p (type, di))
12447 for (itk = itk_int; itk != itk_none; itk++)
12449 type = integer_types[itk];
12450 if (type != NULL_TREE
12451 && (pos || !TYPE_UNSIGNED (type))
12452 && double_int_fits_to_tree_p (type, di))
12455 if (type && cxx_dialect < cxx0x
12456 && itk > itk_unsigned_long)
12457 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12458 incremented enumerator value is too large for %<unsigned long%>" : "\
12459 incremented enumerator value is too large for %<long%>");
12461 if (type == NULL_TREE)
12464 value = double_int_to_tree (type, di);
12469 error ("overflow in enumeration values at %qD", name);
12470 value = error_mark_node;
12475 value = integer_zero_node;
12478 /* Remove no-op casts from the value. */
12479 STRIP_TYPE_NOPS (value);
12481 /* If the underlying type of the enum is fixed, check whether
12482 the enumerator values fits in the underlying type. If it
12483 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12484 if (ENUM_UNDERLYING_TYPE (enumtype)
12486 && TREE_CODE (value) == INTEGER_CST
12487 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12489 error ("enumerator value %E is too large for underlying type %<%T%>",
12490 value, ENUM_UNDERLYING_TYPE (enumtype));
12492 /* Silently convert the value so that we can continue. */
12493 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12498 /* C++ associates enums with global, function, or class declarations. */
12499 context = current_scope ();
12501 /* Build the actual enumeration constant. Note that the enumeration
12502 constants have the underlying type of the enum (if it is fixed)
12503 or the type of their initializer (if the underlying type of the
12504 enum is not fixed):
12508 If the underlying type is fixed, the type of each enumerator
12509 prior to the closing brace is the underlying type; if the
12510 initializing value of an enumerator cannot be represented by
12511 the underlying type, the program is ill-formed. If the
12512 underlying type is not fixed, the type of each enumerator is
12513 the type of its initializing value.
12515 If the underlying type is not fixed, it will be computed by
12516 finish_enum and we will reset the type of this enumerator. Of
12517 course, if we're processing a template, there may be no value. */
12518 type = value ? TREE_TYPE (value) : NULL_TREE;
12520 if (context && context == current_class_type)
12521 /* This enum declaration is local to the class. We need the full
12522 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12523 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12525 /* It's a global enum, or it's local to a function. (Note local to
12526 a function could mean local to a class method. */
12527 decl = build_decl (loc, CONST_DECL, name, type);
12529 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12530 TREE_CONSTANT (decl) = 1;
12531 TREE_READONLY (decl) = 1;
12532 DECL_INITIAL (decl) = value;
12534 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12535 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12536 on the TYPE_FIELDS list for `S'. (That's so that you can say
12537 things like `S::i' later.) */
12538 finish_member_declaration (decl);
12542 /* Add this enumeration constant to the list for this type. */
12543 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12546 /* Look for an enumerator with the given NAME within the enumeration
12547 type ENUMTYPE. This routine is used primarily for qualified name
12548 lookup into an enumerator in C++0x, e.g.,
12550 enum class Color { Red, Green, Blue };
12552 Color color = Color::Red;
12554 Returns the value corresponding to the enumerator, or
12555 NULL_TREE if no such enumerator was found. */
12557 lookup_enumerator (tree enumtype, tree name)
12560 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12562 e = purpose_member (name, TYPE_VALUES (enumtype));
12563 return e? TREE_VALUE (e) : NULL_TREE;
12567 /* We're defining DECL. Make sure that its type is OK. */
12570 check_function_type (tree decl, tree current_function_parms)
12572 tree fntype = TREE_TYPE (decl);
12573 tree return_type = complete_type (TREE_TYPE (fntype));
12575 /* In a function definition, arg types must be complete. */
12576 require_complete_types_for_parms (current_function_parms);
12578 if (dependent_type_p (return_type))
12580 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12581 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12583 tree args = TYPE_ARG_TYPES (fntype);
12585 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12586 error ("return type %q#T is incomplete", return_type);
12588 error ("return type has Java class type %q#T", return_type);
12590 /* Make it return void instead. */
12591 if (TREE_CODE (fntype) == METHOD_TYPE)
12592 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12594 TREE_CHAIN (args));
12596 fntype = build_function_type (void_type_node, args);
12598 = build_exception_variant (fntype,
12599 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12600 fntype = (cp_build_type_attribute_variant
12601 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12602 TREE_TYPE (decl) = fntype;
12605 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12608 /* Create the FUNCTION_DECL for a function definition.
12609 DECLSPECS and DECLARATOR are the parts of the declaration;
12610 they describe the function's name and the type it returns,
12611 but twisted together in a fashion that parallels the syntax of C.
12613 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12614 DECLARATOR is really the DECL for the function we are about to
12615 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12616 indicating that the function is an inline defined in-class.
12618 This function creates a binding context for the function body
12619 as well as setting up the FUNCTION_DECL in current_function_decl.
12621 For C++, we must first check whether that datum makes any sense.
12622 For example, "class A local_a(1,2);" means that variable local_a
12623 is an aggregate of type A, which should have a constructor
12624 applied to it with the argument list [1, 2].
12626 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12627 or may be a BLOCK if the function has been defined previously
12628 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12629 error_mark_node if the function has never been defined, or
12630 a BLOCK if the function has been defined somewhere. */
12633 start_preparsed_function (tree decl1, tree attrs, int flags)
12635 tree ctype = NULL_TREE;
12638 int doing_friend = 0;
12639 cp_binding_level *bl;
12640 tree current_function_parms;
12641 struct c_fileinfo *finfo
12642 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12643 bool honor_interface;
12645 /* Sanity check. */
12646 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12647 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12649 fntype = TREE_TYPE (decl1);
12650 if (TREE_CODE (fntype) == METHOD_TYPE)
12651 ctype = TYPE_METHOD_BASETYPE (fntype);
12653 /* ISO C++ 11.4/5. A friend function defined in a class is in
12654 the (lexical) scope of the class in which it is defined. */
12655 if (!ctype && DECL_FRIEND_P (decl1))
12657 ctype = DECL_FRIEND_CONTEXT (decl1);
12659 /* CTYPE could be null here if we're dealing with a template;
12660 for example, `inline friend float foo()' inside a template
12661 will have no CTYPE set. */
12662 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12668 if (DECL_DECLARED_INLINE_P (decl1)
12669 && lookup_attribute ("noinline", attrs))
12670 warning (0, "inline function %q+D given attribute noinline", decl1);
12672 /* Handle gnu_inline attribute. */
12673 if (GNU_INLINE_P (decl1))
12675 DECL_EXTERNAL (decl1) = 1;
12676 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12677 DECL_INTERFACE_KNOWN (decl1) = 1;
12678 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12681 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12682 /* This is a constructor, we must ensure that any default args
12683 introduced by this definition are propagated to the clones
12684 now. The clones are used directly in overload resolution. */
12685 adjust_clone_args (decl1);
12687 /* Sometimes we don't notice that a function is a static member, and
12688 build a METHOD_TYPE for it. Fix that up now. */
12689 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12690 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12692 /* Set up current_class_type, and enter the scope of the class, if
12695 push_nested_class (ctype);
12696 else if (DECL_STATIC_FUNCTION_P (decl1))
12697 push_nested_class (DECL_CONTEXT (decl1));
12699 /* Now that we have entered the scope of the class, we must restore
12700 the bindings for any template parameters surrounding DECL1, if it
12701 is an inline member template. (Order is important; consider the
12702 case where a template parameter has the same name as a field of
12703 the class.) It is not until after this point that
12704 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12705 if (flags & SF_INCLASS_INLINE)
12706 maybe_begin_member_template_processing (decl1);
12708 /* Effective C++ rule 15. */
12710 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12711 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12712 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12714 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12715 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12716 if (!DECL_INITIAL (decl1))
12717 DECL_INITIAL (decl1) = error_mark_node;
12719 /* This function exists in static storage.
12720 (This does not mean `static' in the C sense!) */
12721 TREE_STATIC (decl1) = 1;
12723 /* We must call push_template_decl after current_class_type is set
12724 up. (If we are processing inline definitions after exiting a
12725 class scope, current_class_type will be NULL_TREE until set above
12726 by push_nested_class.) */
12727 if (processing_template_decl)
12729 /* FIXME: Handle error_mark_node more gracefully. */
12730 tree newdecl1 = push_template_decl (decl1);
12731 if (newdecl1 != error_mark_node)
12735 /* We are now in the scope of the function being defined. */
12736 current_function_decl = decl1;
12738 /* Save the parm names or decls from this function's declarator
12739 where store_parm_decls will find them. */
12740 current_function_parms = DECL_ARGUMENTS (decl1);
12742 /* Make sure the parameter and return types are reasonable. When
12743 you declare a function, these types can be incomplete, but they
12744 must be complete when you define the function. */
12745 check_function_type (decl1, current_function_parms);
12747 /* Build the return declaration for the function. */
12748 restype = TREE_TYPE (fntype);
12749 if (DECL_RESULT (decl1) == NULL_TREE)
12753 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12754 DECL_ARTIFICIAL (resdecl) = 1;
12755 DECL_IGNORED_P (resdecl) = 1;
12756 DECL_RESULT (decl1) = resdecl;
12758 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12761 /* Let the user know we're compiling this function. */
12762 announce_function (decl1);
12764 /* Record the decl so that the function name is defined.
12765 If we already have a decl for this name, and it is a FUNCTION_DECL,
12766 use the old decl. */
12767 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12769 /* A specialization is not used to guide overload resolution. */
12770 if (!DECL_FUNCTION_MEMBER_P (decl1)
12771 && !(DECL_USE_TEMPLATE (decl1) &&
12772 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12774 tree olddecl = pushdecl (decl1);
12776 if (olddecl == error_mark_node)
12777 /* If something went wrong when registering the declaration,
12778 use DECL1; we have to have a FUNCTION_DECL to use when
12779 parsing the body of the function. */
12783 /* Otherwise, OLDDECL is either a previous declaration
12784 of the same function or DECL1 itself. */
12786 if (warn_missing_declarations
12787 && olddecl == decl1
12788 && !DECL_MAIN_P (decl1)
12789 && TREE_PUBLIC (decl1)
12790 && !DECL_DECLARED_INLINE_P (decl1))
12794 /* Check whether DECL1 is in an anonymous
12796 for (context = DECL_CONTEXT (decl1);
12798 context = DECL_CONTEXT (context))
12800 if (TREE_CODE (context) == NAMESPACE_DECL
12801 && DECL_NAME (context) == NULL_TREE)
12805 if (context == NULL)
12806 warning (OPT_Wmissing_declarations,
12807 "no previous declaration for %q+D", decl1);
12815 /* We need to set the DECL_CONTEXT. */
12816 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12817 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12819 fntype = TREE_TYPE (decl1);
12821 /* If #pragma weak applies, mark the decl appropriately now.
12822 The pragma only applies to global functions. Because
12823 determining whether or not the #pragma applies involves
12824 computing the mangled name for the declaration, we cannot
12825 apply the pragma until after we have merged this declaration
12826 with any previous declarations; if the original declaration
12827 has a linkage specification, that specification applies to
12828 the definition as well, and may affect the mangled name. */
12829 if (DECL_FILE_SCOPE_P (decl1))
12830 maybe_apply_pragma_weak (decl1);
12833 /* Reset this in case the call to pushdecl changed it. */
12834 current_function_decl = decl1;
12836 gcc_assert (DECL_INITIAL (decl1));
12838 /* This function may already have been parsed, in which case just
12839 return; our caller will skip over the body without parsing. */
12840 if (DECL_INITIAL (decl1) != error_mark_node)
12843 /* Initialize RTL machinery. We cannot do this until
12844 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12845 even when processing a template; this is how we get
12846 CFUN set up, and our per-function variables initialized.
12847 FIXME factor out the non-RTL stuff. */
12848 bl = current_binding_level;
12849 allocate_struct_function (decl1, processing_template_decl);
12851 /* Initialize the language data structures. Whenever we start
12852 a new function, we destroy temporaries in the usual way. */
12853 cfun->language = ggc_alloc_cleared_language_function ();
12854 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12855 current_binding_level = bl;
12857 /* Start the statement-tree, start the tree now. */
12858 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12860 /* If we are (erroneously) defining a function that we have already
12861 defined before, wipe out what we knew before. */
12862 if (!DECL_PENDING_INLINE_P (decl1))
12863 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12865 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12867 /* We know that this was set up by `grokclassfn'. We do not
12868 wait until `store_parm_decls', since evil parse errors may
12869 never get us to that point. Here we keep the consistency
12870 between `current_class_type' and `current_class_ptr'. */
12871 tree t = DECL_ARGUMENTS (decl1);
12873 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12874 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12876 cp_function_chain->x_current_class_ref
12877 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12878 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12879 cp_function_chain->x_current_class_ptr = t;
12881 /* Constructors and destructors need to know whether they're "in
12882 charge" of initializing virtual base classes. */
12883 t = DECL_CHAIN (t);
12884 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12886 current_in_charge_parm = t;
12887 t = DECL_CHAIN (t);
12889 if (DECL_HAS_VTT_PARM_P (decl1))
12891 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12892 current_vtt_parm = t;
12896 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12897 /* Implicitly-defined methods (like the
12898 destructor for a class in which no destructor
12899 is explicitly declared) must not be defined
12900 until their definition is needed. So, we
12901 ignore interface specifications for
12902 compiler-generated functions. */
12903 && !DECL_ARTIFICIAL (decl1));
12905 if (processing_template_decl)
12906 /* Don't mess with interface flags. */;
12907 else if (DECL_INTERFACE_KNOWN (decl1))
12909 tree ctx = decl_function_context (decl1);
12911 if (DECL_NOT_REALLY_EXTERN (decl1))
12912 DECL_EXTERNAL (decl1) = 0;
12914 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12915 && TREE_PUBLIC (ctx))
12916 /* This is a function in a local class in an extern inline
12918 comdat_linkage (decl1);
12920 /* If this function belongs to an interface, it is public.
12921 If it belongs to someone else's interface, it is also external.
12922 This only affects inlines and template instantiations. */
12923 else if (!finfo->interface_unknown && honor_interface)
12925 if (DECL_DECLARED_INLINE_P (decl1)
12926 || DECL_TEMPLATE_INSTANTIATION (decl1))
12928 DECL_EXTERNAL (decl1)
12929 = (finfo->interface_only
12930 || (DECL_DECLARED_INLINE_P (decl1)
12931 && ! flag_implement_inlines
12932 && !DECL_VINDEX (decl1)));
12934 /* For WIN32 we also want to put these in linkonce sections. */
12935 maybe_make_one_only (decl1);
12938 DECL_EXTERNAL (decl1) = 0;
12939 DECL_INTERFACE_KNOWN (decl1) = 1;
12940 /* If this function is in an interface implemented in this file,
12941 make sure that the back end knows to emit this function
12943 if (!DECL_EXTERNAL (decl1))
12944 mark_needed (decl1);
12946 else if (finfo->interface_unknown && finfo->interface_only
12947 && honor_interface)
12949 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12950 interface, we will have both finfo->interface_unknown and
12951 finfo->interface_only set. In that case, we don't want to
12952 use the normal heuristics because someone will supply a
12953 #pragma implementation elsewhere, and deducing it here would
12954 produce a conflict. */
12955 comdat_linkage (decl1);
12956 DECL_EXTERNAL (decl1) = 0;
12957 DECL_INTERFACE_KNOWN (decl1) = 1;
12958 DECL_DEFER_OUTPUT (decl1) = 1;
12962 /* This is a definition, not a reference.
12963 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12964 if (!GNU_INLINE_P (decl1))
12965 DECL_EXTERNAL (decl1) = 0;
12967 if ((DECL_DECLARED_INLINE_P (decl1)
12968 || DECL_TEMPLATE_INSTANTIATION (decl1))
12969 && ! DECL_INTERFACE_KNOWN (decl1))
12970 DECL_DEFER_OUTPUT (decl1) = 1;
12972 DECL_INTERFACE_KNOWN (decl1) = 1;
12975 /* Determine the ELF visibility attribute for the function. We must not
12976 do this before calling "pushdecl", as we must allow "duplicate_decls"
12977 to merge any attributes appropriately. We also need to wait until
12979 if (!DECL_CLONED_FUNCTION_P (decl1))
12980 determine_visibility (decl1);
12982 begin_scope (sk_function_parms, decl1);
12986 if (DECL_DESTRUCTOR_P (decl1)
12987 || (DECL_CONSTRUCTOR_P (decl1)
12988 && targetm.cxx.cdtor_returns_this ()))
12990 cdtor_label = build_decl (input_location,
12991 LABEL_DECL, NULL_TREE, NULL_TREE);
12992 DECL_CONTEXT (cdtor_label) = current_function_decl;
12995 start_fname_decls ();
12997 store_parm_decls (current_function_parms);
13001 /* Like start_preparsed_function, except that instead of a
13002 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
13004 Returns 1 on success. If the DECLARATOR is not suitable for a function
13005 (it defines a datum instead), we return 0, which tells
13006 yyparse to report a parse error. */
13009 start_function (cp_decl_specifier_seq *declspecs,
13010 const cp_declarator *declarator,
13015 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13016 if (decl1 == error_mark_node)
13018 /* If the declarator is not suitable for a function definition,
13019 cause a syntax error. */
13020 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13022 error ("invalid function declaration");
13026 if (DECL_MAIN_P (decl1))
13027 /* main must return int. grokfndecl should have corrected it
13028 (and issued a diagnostic) if the user got it wrong. */
13029 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13030 integer_type_node));
13032 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13037 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13041 use_eh_spec_block (tree fn)
13043 return (flag_exceptions && flag_enforce_eh_specs
13044 && !processing_template_decl
13045 && !type_throw_all_p (TREE_TYPE (fn))
13046 /* We insert the EH_SPEC_BLOCK only in the original
13047 function; then, it is copied automatically to the
13049 && !DECL_CLONED_FUNCTION_P (fn)
13050 /* Implicitly-generated constructors and destructors have
13051 exception specifications. However, those specifications
13052 are the union of the possible exceptions specified by the
13053 constructors/destructors for bases and members, so no
13054 unallowed exception will ever reach this function. By
13055 not creating the EH_SPEC_BLOCK we save a little memory,
13056 and we avoid spurious warnings about unreachable
13058 && !DECL_DEFAULTED_FN (fn));
13061 /* Store the parameter declarations into the current function declaration.
13062 This is called after parsing the parameter declarations, before
13063 digesting the body of the function.
13065 Also install to binding contour return value identifier, if any. */
13068 store_parm_decls (tree current_function_parms)
13070 tree fndecl = current_function_decl;
13073 /* This is a chain of any other decls that came in among the parm
13074 declarations. If a parm is declared with enum {foo, bar} x;
13075 then CONST_DECLs for foo and bar are put here. */
13076 tree nonparms = NULL_TREE;
13078 if (current_function_parms)
13080 /* This case is when the function was defined with an ANSI prototype.
13081 The parms already have decls, so we need not do anything here
13082 except record them as in effect
13083 and complain if any redundant old-style parm decls were written. */
13085 tree specparms = current_function_parms;
13088 /* Must clear this because it might contain TYPE_DECLs declared
13090 current_binding_level->names = NULL;
13092 /* If we're doing semantic analysis, then we'll call pushdecl
13093 for each of these. We must do them in reverse order so that
13094 they end in the correct forward order. */
13095 specparms = nreverse (specparms);
13097 for (parm = specparms; parm; parm = next)
13099 next = DECL_CHAIN (parm);
13100 if (TREE_CODE (parm) == PARM_DECL)
13102 if (DECL_NAME (parm) == NULL_TREE
13103 || TREE_CODE (parm) != VOID_TYPE)
13106 error ("parameter %qD declared void", parm);
13110 /* If we find an enum constant or a type tag,
13111 put it aside for the moment. */
13112 TREE_CHAIN (parm) = NULL_TREE;
13113 nonparms = chainon (nonparms, parm);
13117 /* Get the decls in their original chain order and record in the
13118 function. This is all and only the PARM_DECLs that were
13119 pushed into scope by the loop above. */
13120 DECL_ARGUMENTS (fndecl) = getdecls ();
13123 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13125 /* Now store the final chain of decls for the arguments
13126 as the decl-chain of the current lexical scope.
13127 Put the enumerators in as well, at the front so that
13128 DECL_ARGUMENTS is not modified. */
13129 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13131 if (use_eh_spec_block (current_function_decl))
13132 current_eh_spec_block = begin_eh_spec_block ();
13136 /* We have finished doing semantic analysis on DECL, but have not yet
13137 generated RTL for its body. Save away our current state, so that
13138 when we want to generate RTL later we know what to do. */
13141 save_function_data (tree decl)
13143 struct language_function *f;
13145 /* Save the language-specific per-function data so that we can
13146 get it back when we really expand this function. */
13147 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13150 f = ggc_alloc_language_function ();
13151 memcpy (f, cp_function_chain, sizeof (struct language_function));
13152 DECL_SAVED_FUNCTION_DATA (decl) = f;
13154 /* Clear out the bits we don't need. */
13155 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13156 f->bindings = NULL;
13157 f->x_local_names = NULL;
13158 f->base.local_typedefs = NULL;
13162 /* Set the return value of the constructor (if present). */
13165 finish_constructor_body (void)
13170 if (targetm.cxx.cdtor_returns_this ()
13171 && (! TYPE_FOR_JAVA (current_class_type)))
13173 /* Any return from a constructor will end up here. */
13174 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13176 val = DECL_ARGUMENTS (current_function_decl);
13177 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13178 DECL_RESULT (current_function_decl), val);
13179 /* Return the address of the object. */
13180 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13181 add_stmt (exprstmt);
13185 /* Do all the processing for the beginning of a destructor; set up the
13186 vtable pointers and cleanups for bases and members. */
13189 begin_destructor_body (void)
13191 tree compound_stmt;
13193 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13194 issued an error message. We still want to try to process the
13195 body of the function, but initialize_vtbl_ptrs will crash if
13196 TYPE_BINFO is NULL. */
13197 if (COMPLETE_TYPE_P (current_class_type))
13199 compound_stmt = begin_compound_stmt (0);
13200 /* Make all virtual function table pointers in non-virtual base
13201 classes point to CURRENT_CLASS_TYPE's virtual function
13203 initialize_vtbl_ptrs (current_class_ptr);
13204 finish_compound_stmt (compound_stmt);
13206 /* And insert cleanups for our bases and members so that they
13207 will be properly destroyed if we throw. */
13208 push_base_cleanups ();
13212 /* At the end of every destructor we generate code to delete the object if
13213 necessary. Do that now. */
13216 finish_destructor_body (void)
13220 /* Any return from a destructor will end up here; that way all base
13221 and member cleanups will be run when the function returns. */
13222 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13224 /* In a virtual destructor, we must call delete. */
13225 if (DECL_VIRTUAL_P (current_function_decl))
13228 tree virtual_size = cxx_sizeof (current_class_type);
13232 At the point of definition of a virtual destructor (including
13233 an implicit definition), non-placement operator delete shall
13234 be looked up in the scope of the destructor's class and if
13235 found shall be accessible and unambiguous. */
13236 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13238 /*global_p=*/false,
13239 /*placement=*/NULL_TREE,
13240 /*alloc_fn=*/NULL_TREE);
13242 if_stmt = begin_if_stmt ();
13243 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13244 current_in_charge_parm,
13247 finish_expr_stmt (exprstmt);
13248 finish_then_clause (if_stmt);
13249 finish_if_stmt (if_stmt);
13252 if (targetm.cxx.cdtor_returns_this ())
13256 val = DECL_ARGUMENTS (current_function_decl);
13257 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13258 DECL_RESULT (current_function_decl), val);
13259 /* Return the address of the object. */
13260 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13261 add_stmt (exprstmt);
13265 /* Do the necessary processing for the beginning of a function body, which
13266 in this case includes member-initializers, but not the catch clauses of
13267 a function-try-block. Currently, this means opening a binding level
13268 for the member-initializers (in a ctor), member cleanups (in a dtor),
13269 and capture proxies (in a lambda operator()). */
13272 begin_function_body (void)
13276 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13279 if (processing_template_decl)
13280 /* Do nothing now. */;
13282 /* Always keep the BLOCK node associated with the outermost pair of
13283 curly braces of a function. These are needed for correct
13284 operation of dwarfout.c. */
13285 keep_next_level (true);
13287 stmt = begin_compound_stmt (BCS_FN_BODY);
13289 if (processing_template_decl)
13290 /* Do nothing now. */;
13291 else if (DECL_DESTRUCTOR_P (current_function_decl))
13292 begin_destructor_body ();
13297 /* Do the processing for the end of a function body. Currently, this means
13298 closing out the cleanups for fully-constructed bases and members, and in
13299 the case of the destructor, deleting the object if desired. Again, this
13300 is only meaningful for [cd]tors, since they are the only functions where
13301 there is a significant distinction between the main body and any
13302 function catch clauses. Handling, say, main() return semantics here
13303 would be wrong, as flowing off the end of a function catch clause for
13304 main() would also need to return 0. */
13307 finish_function_body (tree compstmt)
13309 if (compstmt == NULL_TREE)
13312 /* Close the block. */
13313 finish_compound_stmt (compstmt);
13315 if (processing_template_decl)
13316 /* Do nothing now. */;
13317 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13318 finish_constructor_body ();
13319 else if (DECL_DESTRUCTOR_P (current_function_decl))
13320 finish_destructor_body ();
13323 /* Given a function, returns the BLOCK corresponding to the outermost level
13324 of curly braces, skipping the artificial block created for constructor
13328 outer_curly_brace_block (tree fndecl)
13330 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13331 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13332 /* Skip the artificial function body block. */
13333 block = BLOCK_SUBBLOCKS (block);
13337 /* If FNDECL is a class's key method, add the class to the list of
13338 keyed classes that should be emitted. */
13341 record_key_method_defined (tree fndecl)
13343 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13344 && DECL_VIRTUAL_P (fndecl)
13345 && !processing_template_decl)
13347 tree fnclass = DECL_CONTEXT (fndecl);
13348 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13349 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13353 /* Subroutine of finish_function.
13354 Save the body of constexpr functions for possible
13355 future compile time evaluation. */
13358 maybe_save_function_definition (tree fun)
13360 if (!processing_template_decl
13361 && DECL_DECLARED_CONSTEXPR_P (fun)
13362 && !DECL_CLONED_FUNCTION_P (fun))
13363 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13366 /* Finish up a function declaration and compile that function
13367 all the way to assembler language output. The free the storage
13368 for the function definition.
13370 FLAGS is a bitwise or of the following values:
13372 We just finished processing the body of an in-class inline
13373 function definition. (This processing will have taken place
13374 after the class definition is complete.) */
13377 finish_function (int flags)
13379 tree fndecl = current_function_decl;
13380 tree fntype, ctype = NULL_TREE;
13381 int inclass_inline = (flags & 2) != 0;
13383 /* When we get some parse errors, we can end up without a
13384 current_function_decl, so cope. */
13385 if (fndecl == NULL_TREE)
13386 return error_mark_node;
13388 if (c_dialect_objc ())
13389 objc_finish_function ();
13391 gcc_assert (!defer_mark_used_calls);
13392 defer_mark_used_calls = true;
13394 record_key_method_defined (fndecl);
13396 fntype = TREE_TYPE (fndecl);
13398 /* TREE_READONLY (fndecl) = 1;
13399 This caused &foo to be of type ptr-to-const-function
13400 which then got a warning when stored in a ptr-to-function variable. */
13402 gcc_assert (building_stmt_list_p ());
13403 /* The current function is being defined, so its DECL_INITIAL should
13404 be set, and unless there's a multiple definition, it should be
13405 error_mark_node. */
13406 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13408 /* For a cloned function, we've already got all the code we need;
13409 there's no need to add any extra bits. */
13410 if (!DECL_CLONED_FUNCTION_P (fndecl))
13412 if (DECL_MAIN_P (current_function_decl))
13414 /* Make it so that `main' always returns 0 by default (or
13417 finish_return_stmt (integer_one_node);
13419 finish_return_stmt (integer_zero_node);
13423 if (use_eh_spec_block (current_function_decl))
13424 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13425 (TREE_TYPE (current_function_decl)),
13426 current_eh_spec_block);
13429 /* If we're saving up tree structure, tie off the function now. */
13430 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13432 finish_fname_decls ();
13434 /* If this function can't throw any exceptions, remember that. */
13435 if (!processing_template_decl
13436 && !cp_function_chain->can_throw
13437 && !flag_non_call_exceptions
13438 && !decl_replaceable_p (fndecl))
13439 TREE_NOTHROW (fndecl) = 1;
13441 /* This must come after expand_function_end because cleanups might
13442 have declarations (from inline functions) that need to go into
13443 this function's blocks. */
13445 /* If the current binding level isn't the outermost binding level
13446 for this function, either there is a bug, or we have experienced
13447 syntax errors and the statement tree is malformed. */
13448 if (current_binding_level->kind != sk_function_parms)
13450 /* Make sure we have already experienced errors. */
13451 gcc_assert (errorcount);
13453 /* Throw away the broken statement tree and extra binding
13455 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13457 while (current_binding_level->kind != sk_function_parms)
13459 if (current_binding_level->kind == sk_class)
13460 pop_nested_class ();
13462 poplevel (0, 0, 0);
13465 poplevel (1, 0, 1);
13467 /* Statements should always be full-expressions at the outermost set
13468 of curly braces for a function. */
13469 gcc_assert (stmts_are_full_exprs_p ());
13471 /* Save constexpr function body before it gets munged by
13472 the NRV transformation. */
13473 maybe_save_function_definition (fndecl);
13475 /* Set up the named return value optimization, if we can. Candidate
13476 variables are selected in check_return_expr. */
13477 if (current_function_return_value)
13479 tree r = current_function_return_value;
13482 if (r != error_mark_node
13483 /* This is only worth doing for fns that return in memory--and
13484 simpler, since we don't have to worry about promoted modes. */
13485 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13486 /* Only allow this for variables declared in the outer scope of
13487 the function so we know that their lifetime always ends with a
13488 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13489 we were to do this optimization in tree-ssa. */
13490 && (outer = outer_curly_brace_block (fndecl))
13491 && chain_member (r, BLOCK_VARS (outer)))
13492 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13494 current_function_return_value = NULL_TREE;
13497 /* Remember that we were in class scope. */
13498 if (current_class_name)
13499 ctype = current_class_type;
13501 /* Must mark the RESULT_DECL as being in this function. */
13502 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13504 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13505 to the FUNCTION_DECL node itself. */
13506 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13508 /* Save away current state, if appropriate. */
13509 if (!processing_template_decl)
13510 save_function_data (fndecl);
13512 /* Complain if there's just no return statement. */
13513 if (warn_return_type
13514 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13515 && !dependent_type_p (TREE_TYPE (fntype))
13516 && !current_function_returns_value && !current_function_returns_null
13517 /* Don't complain if we abort or throw. */
13518 && !current_function_returns_abnormally
13519 /* Don't complain if we are declared noreturn. */
13520 && !TREE_THIS_VOLATILE (fndecl)
13521 && !DECL_NAME (DECL_RESULT (fndecl))
13522 && !TREE_NO_WARNING (fndecl)
13523 /* Structor return values (if any) are set by the compiler. */
13524 && !DECL_CONSTRUCTOR_P (fndecl)
13525 && !DECL_DESTRUCTOR_P (fndecl))
13527 warning (OPT_Wreturn_type,
13528 "no return statement in function returning non-void");
13529 TREE_NO_WARNING (fndecl) = 1;
13532 /* Store the end of the function, so that we get good line number
13533 info for the epilogue. */
13534 cfun->function_end_locus = input_location;
13536 /* Complain about parameters that are only set, but never otherwise used. */
13537 if (warn_unused_but_set_parameter
13538 && !processing_template_decl
13539 && errorcount == unused_but_set_errorcount
13540 && !DECL_CLONED_FUNCTION_P (fndecl))
13544 for (decl = DECL_ARGUMENTS (fndecl);
13546 decl = DECL_CHAIN (decl))
13547 if (TREE_USED (decl)
13548 && TREE_CODE (decl) == PARM_DECL
13549 && !DECL_READ_P (decl)
13550 && DECL_NAME (decl)
13551 && !DECL_ARTIFICIAL (decl)
13552 && !TREE_NO_WARNING (decl)
13553 && !DECL_IN_SYSTEM_HEADER (decl)
13554 && TREE_TYPE (decl) != error_mark_node
13555 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13556 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13557 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13558 warning (OPT_Wunused_but_set_parameter,
13559 "parameter %q+D set but not used", decl);
13560 unused_but_set_errorcount = errorcount;
13563 /* Complain about locally defined typedefs that are not used in this
13565 maybe_warn_unused_local_typedefs ();
13567 /* Genericize before inlining. */
13568 if (!processing_template_decl)
13570 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13571 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13572 cp_genericize (fndecl);
13573 /* Clear out the bits we don't need. */
13574 f->x_current_class_ptr = NULL;
13575 f->x_current_class_ref = NULL;
13576 f->x_eh_spec_block = NULL;
13577 f->x_in_charge_parm = NULL;
13578 f->x_vtt_parm = NULL;
13579 f->x_return_value = NULL;
13580 f->bindings = NULL;
13581 f->extern_decl_map = NULL;
13583 /* Clear out the bits we don't need. */
13584 local_names = NULL;
13586 /* We're leaving the context of this function, so zap cfun. It's still in
13587 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13589 current_function_decl = NULL;
13591 /* If this is an in-class inline definition, we may have to pop the
13592 bindings for the template parameters that we added in
13593 maybe_begin_member_template_processing when start_function was
13595 if (inclass_inline)
13596 maybe_end_member_template_processing ();
13598 /* Leave the scope of the class. */
13600 pop_nested_class ();
13605 current_function_decl = NULL_TREE;
13607 defer_mark_used_calls = false;
13608 if (deferred_mark_used_calls)
13613 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13615 VEC_free (tree, gc, deferred_mark_used_calls);
13621 /* Create the FUNCTION_DECL for a function definition.
13622 DECLSPECS and DECLARATOR are the parts of the declaration;
13623 they describe the return type and the name of the function,
13624 but twisted together in a fashion that parallels the syntax of C.
13626 This function creates a binding context for the function body
13627 as well as setting up the FUNCTION_DECL in current_function_decl.
13629 Returns a FUNCTION_DECL on success.
13631 If the DECLARATOR is not suitable for a function (it defines a datum
13632 instead), we return 0, which tells yyparse to report a parse error.
13634 May return void_type_node indicating that this method is actually
13635 a friend. See grokfield for more details.
13637 Came here with a `.pushlevel' .
13639 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13640 CHANGES TO CODE IN `grokfield'. */
13643 grokmethod (cp_decl_specifier_seq *declspecs,
13644 const cp_declarator *declarator, tree attrlist)
13646 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13649 if (fndecl == error_mark_node)
13650 return error_mark_node;
13652 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13654 error ("invalid member function declaration");
13655 return error_mark_node;
13659 cplus_decl_attributes (&fndecl, attrlist, 0);
13661 /* Pass friends other than inline friend functions back. */
13662 if (fndecl == void_type_node)
13665 if (DECL_IN_AGGR_P (fndecl))
13667 if (DECL_CLASS_SCOPE_P (fndecl))
13668 error ("%qD is already defined in class %qT", fndecl,
13669 DECL_CONTEXT (fndecl));
13670 return error_mark_node;
13673 check_template_shadow (fndecl);
13675 DECL_DECLARED_INLINE_P (fndecl) = 1;
13676 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13678 /* We process method specializations in finish_struct_1. */
13679 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13681 fndecl = push_template_decl (fndecl);
13682 if (fndecl == error_mark_node)
13686 if (! DECL_FRIEND_P (fndecl))
13688 if (DECL_CHAIN (fndecl))
13690 fndecl = copy_node (fndecl);
13691 TREE_CHAIN (fndecl) = NULL_TREE;
13695 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13697 DECL_IN_AGGR_P (fndecl) = 1;
13702 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13703 we can lay it out later, when and if its type becomes complete. */
13706 maybe_register_incomplete_var (tree var)
13708 gcc_assert (TREE_CODE (var) == VAR_DECL);
13710 /* Keep track of variables with incomplete types. */
13711 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13712 && DECL_EXTERNAL (var))
13714 tree inner_type = TREE_TYPE (var);
13716 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13717 inner_type = TREE_TYPE (inner_type);
13718 inner_type = TYPE_MAIN_VARIANT (inner_type);
13720 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13721 /* RTTI TD entries are created while defining the type_info. */
13722 || (TYPE_LANG_SPECIFIC (inner_type)
13723 && TYPE_BEING_DEFINED (inner_type)))
13726 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13728 iv->incomplete_type = inner_type;
13733 /* Called when a class type (given by TYPE) is defined. If there are
13734 any existing VAR_DECLs whose type has been completed by this
13735 declaration, update them now. */
13738 complete_vars (tree type)
13741 incomplete_var *iv;
13743 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13745 if (same_type_p (type, iv->incomplete_type))
13747 tree var = iv->decl;
13748 tree type = TREE_TYPE (var);
13749 /* Complete the type of the variable. The VAR_DECL itself
13750 will be laid out in expand_expr. */
13751 complete_type (type);
13752 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13753 /* Remove this entry from the list. */
13754 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13760 /* Check for pending declarations which may have abstract type. */
13761 complete_type_check_abstract (type);
13764 /* If DECL is of a type which needs a cleanup, build and return an
13765 expression to perform that cleanup here. Return NULL_TREE if no
13766 cleanup need be done. */
13769 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13775 /* Assume no cleanup is required. */
13776 cleanup = NULL_TREE;
13778 if (error_operand_p (decl))
13781 /* Handle "__attribute__((cleanup))". We run the cleanup function
13782 before the destructor since the destructor is what actually
13783 terminates the lifetime of the object. */
13784 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13791 /* Get the name specified by the user for the cleanup function. */
13792 id = TREE_VALUE (TREE_VALUE (attr));
13793 /* Look up the name to find the cleanup function to call. It is
13794 important to use lookup_name here because that is what is
13795 used in c-common.c:handle_cleanup_attribute when performing
13796 initial checks on the attribute. Note that those checks
13797 include ensuring that the function found is not an overloaded
13798 function, or an object with an overloaded call operator,
13799 etc.; we can rely on the fact that the function found is an
13800 ordinary FUNCTION_DECL. */
13801 fn = lookup_name (id);
13802 arg = build_address (decl);
13804 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13805 if (cleanup == error_mark_node)
13806 return error_mark_node;
13808 /* Handle ordinary C++ destructors. */
13809 type = TREE_TYPE (decl);
13810 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13812 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13813 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13814 && CLASSTYPE_VBASECLASSES (type));
13818 if (TREE_CODE (type) == ARRAY_TYPE)
13821 addr = build_address (decl);
13823 /* Optimize for space over speed here. */
13824 if (!has_vbases || flag_expensive_optimizations)
13825 flags |= LOOKUP_NONVIRTUAL;
13827 call = build_delete (TREE_TYPE (addr), addr,
13828 sfk_complete_destructor, flags, 0, complain);
13829 if (call == error_mark_node)
13830 cleanup = error_mark_node;
13832 cleanup = cp_build_compound_expr (cleanup, call, complain);
13837 /* build_delete sets the location of the destructor call to the
13838 current location, even though the destructor is going to be
13839 called later, at the end of the current scope. This can lead to
13840 a "jumpy" behaviour for users of debuggers when they step around
13841 the end of the block. So let's unset the location of the
13842 destructor call instead. */
13843 if (cleanup != NULL && EXPR_P (cleanup))
13844 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
13849 /* When a stmt has been parsed, this function is called. */
13856 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13857 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13858 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13861 static_fn_type (tree memfntype)
13866 if (TYPE_PTRMEMFUNC_P (memfntype))
13867 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13868 if (POINTER_TYPE_P (memfntype)
13869 || TREE_CODE (memfntype) == FUNCTION_DECL)
13870 memfntype = TREE_TYPE (memfntype);
13871 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13873 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13874 args = TYPE_ARG_TYPES (memfntype);
13875 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13876 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13877 fntype = (cp_build_type_attribute_variant
13878 (fntype, TYPE_ATTRIBUTES (memfntype)));
13879 fntype = (build_exception_variant
13880 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13884 /* DECL was originally constructed as a non-static member function,
13885 but turned out to be static. Update it accordingly. */
13888 revert_static_member_fn (tree decl)
13890 tree stype = static_fn_type (decl);
13891 cp_cv_quals quals = type_memfn_quals (stype);
13893 if (quals != TYPE_UNQUALIFIED)
13894 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13896 TREE_TYPE (decl) = stype;
13898 if (DECL_ARGUMENTS (decl))
13899 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13900 DECL_STATIC_FUNCTION_P (decl) = 1;
13903 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13904 one of the language-independent trees. */
13906 enum cp_tree_node_structure_enum
13907 cp_tree_node_structure (union lang_tree_node * t)
13909 switch (TREE_CODE (&t->generic))
13911 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13912 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13913 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13914 case OVERLOAD: return TS_CP_OVERLOAD;
13915 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13916 case PTRMEM_CST: return TS_CP_PTRMEM;
13917 case BASELINK: return TS_CP_BASELINK;
13918 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13919 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13920 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13921 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13922 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13923 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13924 default: return TS_CP_GENERIC;
13928 /* Build the void_list_node (void_type_node having been created). */
13930 build_void_list_node (void)
13932 tree t = build_tree_list (NULL_TREE, void_type_node);
13937 cp_missing_noreturn_ok_p (tree decl)
13939 /* A missing noreturn is ok for the `main' function. */
13940 return DECL_MAIN_P (decl);
13943 /* Return the COMDAT group into which DECL should be placed. */
13946 cxx_comdat_group (tree decl)
13950 /* Virtual tables, construction virtual tables, and virtual table
13951 tables all go in a single COMDAT group, named after the primary
13953 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13954 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13955 /* For all other DECLs, the COMDAT group is the mangled name of the
13956 declaration itself. */
13959 while (DECL_THUNK_P (decl))
13961 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13962 into the same section as the target function. In that case
13963 we must return target's name. */
13964 tree target = THUNK_TARGET (decl);
13965 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13966 && DECL_SECTION_NAME (target) != NULL
13967 && DECL_ONE_ONLY (target))
13972 name = DECL_ASSEMBLER_NAME (decl);
13978 #include "gt-cp-decl.h"