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)
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 maybe_apply_pragma_weak (decl);
4425 if (TREE_CODE (decl) == FUNCTION_DECL
4426 && DECL_DECLARED_INLINE_P (decl)
4427 && DECL_UNINLINABLE (decl)
4428 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4429 warning (0, "inline function %q+D given attribute noinline", decl);
4431 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4433 if (TREE_CODE (decl) == VAR_DECL)
4435 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4436 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4437 error ("%q#D is not a static member of %q#T", decl, context);
4440 if (DECL_CONTEXT (field) != context)
4442 if (!same_type_p (DECL_CONTEXT (field), context))
4443 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4444 "to be defined as %<%T::%D%>",
4445 DECL_CONTEXT (field), DECL_NAME (decl),
4446 context, DECL_NAME (decl));
4447 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4449 if (processing_specialization
4450 && template_class_depth (context) == 0
4451 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4452 error ("template header not allowed in member definition "
4453 "of explicitly specialized class");
4454 /* Static data member are tricky; an in-class initialization
4455 still doesn't provide a definition, so the in-class
4456 declaration will have DECL_EXTERNAL set, but will have an
4457 initialization. Thus, duplicate_decls won't warn
4458 about this situation, and so we check here. */
4459 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4460 error ("duplicate initialization of %qD", decl);
4461 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4463 if (declspecs->specs[(int) ds_constexpr]
4464 && !DECL_DECLARED_CONSTEXPR_P (field))
4465 error ("%qD declared %<constexpr%> outside its class", field);
4470 tree field = check_classfn (context, decl,
4471 (processing_template_decl
4472 > template_class_depth (context))
4473 ? current_template_parms
4475 if (field && field != error_mark_node
4476 && duplicate_decls (decl, field,
4477 /*newdecl_is_friend=*/false))
4481 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4482 DECL_IN_AGGR_P (decl) = 0;
4483 /* Do not mark DECL as an explicit specialization if it was not
4484 already marked as an instantiation; a declaration should
4485 never be marked as a specialization unless we know what
4486 template is being specialized. */
4487 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4489 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4491 /* [temp.expl.spec] An explicit specialization of a static data
4492 member of a template is a definition if the declaration
4493 includes an initializer; otherwise, it is a declaration.
4495 We check for processing_specialization so this only applies
4496 to the new specialization syntax. */
4497 if (!initialized && processing_specialization)
4498 DECL_EXTERNAL (decl) = 1;
4501 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4502 /* Aliases are definitions. */
4504 permerror (input_location, "declaration of %q#D outside of class is not definition",
4508 was_public = TREE_PUBLIC (decl);
4510 /* Enter this declaration into the symbol table. */
4511 decl = maybe_push_decl (decl);
4513 if (processing_template_decl)
4514 decl = push_template_decl (decl);
4515 if (decl == error_mark_node)
4516 return error_mark_node;
4518 /* Tell the back end to use or not use .common as appropriate. If we say
4519 -fconserve-space, we want this to save .data space, at the expense of
4520 wrong semantics. If we say -fno-conserve-space, we want this to
4521 produce errors about redefs; to do this we force variables into the
4523 if (flag_conserve_space
4524 && TREE_CODE (decl) == VAR_DECL
4525 && TREE_PUBLIC (decl)
4526 && !DECL_THREAD_LOCAL_P (decl)
4527 && !have_global_bss_p ())
4528 DECL_COMMON (decl) = 1;
4530 if (TREE_CODE (decl) == VAR_DECL
4531 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4532 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4534 /* This is a const variable with implicit 'static'. Set
4535 DECL_THIS_STATIC so we can tell it from variables that are
4536 !TREE_PUBLIC because of the anonymous namespace. */
4537 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4538 DECL_THIS_STATIC (decl) = 1;
4541 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4542 start_decl_1 (decl, initialized);
4547 /* Process the declaration of a variable DECL. INITIALIZED is true
4548 iff DECL is explicitly initialized. (INITIALIZED is false if the
4549 variable is initialized via an implicitly-called constructor.)
4550 This function must be called for ordinary variables (including, for
4551 example, implicit instantiations of templates), but must not be
4552 called for template declarations. */
4555 start_decl_1 (tree decl, bool initialized)
4559 bool aggregate_definition_p;
4561 gcc_assert (!processing_template_decl);
4563 if (error_operand_p (decl))
4566 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4568 type = TREE_TYPE (decl);
4569 complete_p = COMPLETE_TYPE_P (type);
4570 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4572 /* If an explicit initializer is present, or if this is a definition
4573 of an aggregate, then we need a complete type at this point.
4574 (Scalars are always complete types, so there is nothing to
4575 check.) This code just sets COMPLETE_P; errors (if necessary)
4576 are issued below. */
4577 if ((initialized || aggregate_definition_p)
4579 && COMPLETE_TYPE_P (complete_type (type)))
4582 /* We will not yet have set TREE_READONLY on DECL if the type
4583 was "const", but incomplete, before this point. But, now, we
4584 have a complete type, so we can try again. */
4585 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4589 /* Is it valid for this decl to have an initializer at all? */
4591 /* Don't allow initializations for incomplete types except for
4592 arrays which might be completed by the initialization. */
4594 ; /* A complete type is ok. */
4595 else if (type_uses_auto (type))
4596 ; /* An auto type is ok. */
4597 else if (TREE_CODE (type) != ARRAY_TYPE)
4599 error ("variable %q#D has initializer but incomplete type", decl);
4600 type = TREE_TYPE (decl) = error_mark_node;
4602 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4604 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4605 error ("elements of array %q#D have incomplete type", decl);
4606 /* else we already gave an error in start_decl. */
4609 else if (aggregate_definition_p && !complete_p)
4611 if (type_uses_auto (type))
4612 error ("declaration of %q#D has no initializer", decl);
4614 error ("aggregate %q#D has incomplete type and cannot be defined",
4616 /* Change the type so that assemble_variable will give
4617 DECL an rtl we can live with: (mem (const_int 0)). */
4618 type = TREE_TYPE (decl) = error_mark_node;
4621 /* Create a new scope to hold this declaration if necessary.
4622 Whether or not a new scope is necessary cannot be determined
4623 until after the type has been completed; if the type is a
4624 specialization of a class template it is not until after
4625 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4626 will be set correctly. */
4627 maybe_push_cleanup_level (type);
4630 /* Handle initialization of references. DECL, TYPE, and INIT have the
4631 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4632 but will be set to a new CLEANUP_STMT if a temporary is created
4633 that must be destroyed subsequently.
4635 Returns an initializer expression to use to initialize DECL, or
4636 NULL if the initialization can be performed statically.
4638 Quotes on semantics can be found in ARM 8.4.3. */
4641 grok_reference_init (tree decl, tree type, tree init, int flags)
4643 if (init == NULL_TREE)
4645 if ((DECL_LANG_SPECIFIC (decl) == 0
4646 || DECL_IN_AGGR_P (decl) == 0)
4647 && ! DECL_THIS_EXTERN (decl))
4648 error ("%qD declared as reference but not initialized", decl);
4652 if (TREE_CODE (init) == TREE_LIST)
4653 init = build_x_compound_expr_from_list (init, ELK_INIT,
4654 tf_warning_or_error);
4656 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4657 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4658 /* Note: default conversion is only called in very special cases. */
4659 init = decay_conversion (init);
4661 /* Convert INIT to the reference type TYPE. This may involve the
4662 creation of a temporary, whose lifetime must be the same as that
4663 of the reference. If so, a DECL_EXPR for the temporary will be
4664 added just after the DECL_EXPR for DECL. That's why we don't set
4665 DECL_INITIAL for local references (instead assigning to them
4666 explicitly); we need to allow the temporary to be initialized
4668 return initialize_reference (type, init, flags,
4669 tf_warning_or_error);
4672 /* Designated initializers in arrays are not supported in GNU C++.
4673 The parser cannot detect this error since it does not know whether
4674 a given brace-enclosed initializer is for a class type or for an
4675 array. This function checks that CE does not use a designated
4676 initializer. If it does, an error is issued. Returns true if CE
4677 is valid, i.e., does not have a designated initializer. */
4680 check_array_designated_initializer (const constructor_elt *ce,
4681 unsigned HOST_WIDE_INT index)
4683 /* Designated initializers for array elements are not supported. */
4686 /* The parser only allows identifiers as designated
4688 if (ce->index == error_mark_node)
4689 error ("name used in a GNU-style designated "
4690 "initializer for an array");
4691 else if (TREE_CODE (ce->index) == INTEGER_CST)
4693 /* A C99 designator is OK if it matches the current index. */
4694 if (TREE_INT_CST_LOW (ce->index) == index)
4697 sorry ("non-trivial designated initializers not supported");
4701 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4702 error ("name %qD used in a GNU-style designated "
4703 "initializer for an array", ce->index);
4711 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4712 array until we finish parsing the initializer. If that's the
4713 situation we're in, update DECL accordingly. */
4716 maybe_deduce_size_from_array_init (tree decl, tree init)
4718 tree type = TREE_TYPE (decl);
4720 if (TREE_CODE (type) == ARRAY_TYPE
4721 && TYPE_DOMAIN (type) == NULL_TREE
4722 && TREE_CODE (decl) != TYPE_DECL)
4724 /* do_default is really a C-ism to deal with tentative definitions.
4725 But let's leave it here to ease the eventual merge. */
4726 int do_default = !DECL_EXTERNAL (decl);
4727 tree initializer = init ? init : DECL_INITIAL (decl);
4730 /* Check that there are no designated initializers in INIT, as
4731 those are not supported in GNU C++, and as the middle-end
4732 will crash if presented with a non-numeric designated
4734 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4736 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4737 constructor_elt *ce;
4739 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4740 if (!check_array_designated_initializer (ce, i))
4746 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4750 error ("initializer fails to determine size of %qD", decl);
4751 TREE_TYPE (decl) = error_mark_node;
4753 else if (failure == 2)
4757 error ("array size missing in %qD", decl);
4758 TREE_TYPE (decl) = error_mark_node;
4760 /* If a `static' var's size isn't known, make it extern as
4761 well as static, so it does not get allocated. If it's not
4762 `static', then don't mark it extern; finish_incomplete_decl
4763 will give it a default size and it will get allocated. */
4764 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4765 DECL_EXTERNAL (decl) = 1;
4767 else if (failure == 3)
4769 error ("zero-size array %qD", decl);
4770 TREE_TYPE (decl) = error_mark_node;
4774 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4776 relayout_decl (decl);
4780 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4781 any appropriate error messages regarding the layout. */
4784 layout_var_decl (tree decl)
4788 type = TREE_TYPE (decl);
4789 if (type == error_mark_node)
4792 /* If we haven't already layed out this declaration, do so now.
4793 Note that we must not call complete type for an external object
4794 because it's type might involve templates that we are not
4795 supposed to instantiate yet. (And it's perfectly valid to say
4796 `extern X x' for some incomplete type `X'.) */
4797 if (!DECL_EXTERNAL (decl))
4798 complete_type (type);
4799 if (!DECL_SIZE (decl)
4800 && TREE_TYPE (decl) != error_mark_node
4801 && (COMPLETE_TYPE_P (type)
4802 || (TREE_CODE (type) == ARRAY_TYPE
4803 && !TYPE_DOMAIN (type)
4804 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4805 layout_decl (decl, 0);
4807 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4809 /* An automatic variable with an incomplete type: that is an error.
4810 Don't talk about array types here, since we took care of that
4811 message in grokdeclarator. */
4812 error ("storage size of %qD isn%'t known", decl);
4813 TREE_TYPE (decl) = error_mark_node;
4816 /* Keep this code around in case we later want to control debug info
4817 based on whether a type is "used". (jason 1999-11-11) */
4819 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4820 /* Let debugger know it should output info for this type. */
4821 note_debug_info_needed (ttype);
4823 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4824 note_debug_info_needed (DECL_CONTEXT (decl));
4827 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4828 && DECL_SIZE (decl) != NULL_TREE
4829 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4831 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4832 constant_expression_warning (DECL_SIZE (decl));
4835 error ("storage size of %qD isn%'t constant", decl);
4836 TREE_TYPE (decl) = error_mark_node;
4841 /* If a local static variable is declared in an inline function, or if
4842 we have a weak definition, we must endeavor to create only one
4843 instance of the variable at link-time. */
4846 maybe_commonize_var (tree decl)
4848 /* Static data in a function with comdat linkage also has comdat
4850 if (TREE_STATIC (decl)
4851 /* Don't mess with __FUNCTION__. */
4852 && ! DECL_ARTIFICIAL (decl)
4853 && DECL_FUNCTION_SCOPE_P (decl)
4854 && vague_linkage_p (DECL_CONTEXT (decl)))
4858 /* With weak symbols, we simply make the variable COMDAT;
4859 that will cause copies in multiple translations units to
4861 comdat_linkage (decl);
4865 if (DECL_INITIAL (decl) == NULL_TREE
4866 || DECL_INITIAL (decl) == error_mark_node)
4868 /* Without weak symbols, we can use COMMON to merge
4869 uninitialized variables. */
4870 TREE_PUBLIC (decl) = 1;
4871 DECL_COMMON (decl) = 1;
4875 /* While for initialized variables, we must use internal
4876 linkage -- which means that multiple copies will not
4878 TREE_PUBLIC (decl) = 0;
4879 DECL_COMMON (decl) = 0;
4880 warning_at (input_location, 0,
4881 "sorry: semantics of inline function static "
4882 "data %q+#D are wrong (you%'ll wind up "
4883 "with multiple copies)", decl);
4884 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4885 " you can work around this by removing "
4890 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4891 /* Set it up again; we might have set DECL_INITIAL since the last
4893 comdat_linkage (decl);
4896 /* Issue an error message if DECL is an uninitialized const variable. */
4899 check_for_uninitialized_const_var (tree decl)
4901 tree type = strip_array_types (TREE_TYPE (decl));
4903 /* ``Unless explicitly declared extern, a const object does not have
4904 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4906 if (TREE_CODE (decl) == VAR_DECL
4907 && TREE_CODE (type) != REFERENCE_TYPE
4908 && CP_TYPE_CONST_P (type)
4909 && !DECL_INITIAL (decl))
4911 tree field = default_init_uninitialized_part (type);
4915 permerror (DECL_SOURCE_LOCATION (decl),
4916 "uninitialized const %qD", decl);
4918 if (CLASS_TYPE_P (type))
4920 tree defaulted_ctor;
4922 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4923 "%q#T has no user-provided default constructor", type);
4924 defaulted_ctor = in_class_defaulted_default_constructor (type);
4926 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4927 "constructor is not user-provided because it is "
4928 "explicitly defaulted in the class body");
4929 inform (0, "and the implicitly-defined constructor does not "
4930 "initialize %q+#D", field);
4935 /* Structure holding the current initializer being processed by reshape_init.
4936 CUR is a pointer to the current element being processed, END is a pointer
4937 after the last element present in the initializer. */
4938 typedef struct reshape_iterator_t
4940 constructor_elt *cur;
4941 constructor_elt *end;
4944 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4946 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4947 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4948 initialized. If there are no more such fields, the return value
4952 next_initializable_field (tree field)
4955 && (TREE_CODE (field) != FIELD_DECL
4956 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4957 || DECL_ARTIFICIAL (field)))
4958 field = DECL_CHAIN (field);
4963 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4964 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4965 INTEGER_CST representing the size of the array minus one (the maximum index),
4966 or NULL_TREE if the array was declared without specifying the size. D is
4967 the iterator within the constructor. */
4970 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4971 tsubst_flags_t complain)
4974 bool sized_array_p = (max_index != NULL_TREE);
4975 unsigned HOST_WIDE_INT max_index_cst = 0;
4976 unsigned HOST_WIDE_INT index;
4978 /* The initializer for an array is always a CONSTRUCTOR. */
4979 new_init = build_constructor (init_list_type_node, NULL);
4983 /* Minus 1 is used for zero sized arrays. */
4984 if (integer_all_onesp (max_index))
4987 if (host_integerp (max_index, 1))
4988 max_index_cst = tree_low_cst (max_index, 1);
4989 /* sizetype is sign extended, not zero extended. */
4991 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4995 /* Loop until there are no more initializers. */
4997 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5002 check_array_designated_initializer (d->cur, index);
5003 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5005 if (elt_init == error_mark_node)
5006 return error_mark_node;
5007 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5008 size_int (index), elt_init);
5009 if (!TREE_CONSTANT (elt_init))
5010 TREE_CONSTANT (new_init) = false;
5016 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5017 Parameters are the same of reshape_init_r. */
5020 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5022 tree max_index = NULL_TREE;
5024 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5026 if (TYPE_DOMAIN (type))
5027 max_index = array_type_nelts (type);
5029 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5032 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5033 Parameters are the same of reshape_init_r. */
5036 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5038 tree max_index = NULL_TREE;
5040 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5042 if (COMPOUND_LITERAL_P (d->cur->value))
5044 tree value = d->cur->value;
5045 if (!same_type_p (TREE_TYPE (value), type))
5047 if (complain & tf_error)
5048 error ("invalid type %qT as initializer for a vector of type %qT",
5049 TREE_TYPE (d->cur->value), type);
5050 value = error_mark_node;
5056 /* For a vector, we initialize it as an array of the appropriate size. */
5057 if (TREE_CODE (type) == VECTOR_TYPE)
5058 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5060 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5063 /* Subroutine of reshape_init_r, processes the initializers for classes
5064 or union. Parameters are the same of reshape_init_r. */
5067 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5068 tsubst_flags_t complain)
5073 gcc_assert (CLASS_TYPE_P (type));
5075 /* The initializer for a class is always a CONSTRUCTOR. */
5076 new_init = build_constructor (init_list_type_node, NULL);
5077 field = next_initializable_field (TYPE_FIELDS (type));
5083 An initializer for an aggregate member that is an
5084 empty class shall have the form of an empty
5085 initializer-list {}. */
5086 if (!first_initializer_p)
5088 if (complain & tf_error)
5089 error ("initializer for %qT must be brace-enclosed", type);
5090 return error_mark_node;
5095 /* Loop through the initializable fields, gathering initializers. */
5096 while (d->cur != d->end)
5100 /* Handle designated initializers, as an extension. */
5103 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5105 if (complain & tf_error)
5106 error ("%<[%E] =%> used in a GNU-style designated initializer"
5107 " for class %qT", d->cur->index, type);
5108 return error_mark_node;
5111 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5113 if (!field || TREE_CODE (field) != FIELD_DECL)
5115 if (complain & tf_error)
5116 error ("%qT has no non-static data member named %qD", type,
5118 return error_mark_node;
5122 /* If we processed all the member of the class, we are done. */
5126 field_init = reshape_init_r (TREE_TYPE (field), d,
5127 /*first_initializer_p=*/false, complain);
5128 if (field_init == error_mark_node)
5129 return error_mark_node;
5131 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5135 When a union is initialized with a brace-enclosed
5136 initializer, the braces shall only contain an
5137 initializer for the first member of the union. */
5138 if (TREE_CODE (type) == UNION_TYPE)
5141 field = next_initializable_field (DECL_CHAIN (field));
5147 /* Subroutine of reshape_init_r. We're in a context where C99 initializer
5148 designators are not valid; either complain or return true to indicate
5149 that reshape_init_r should return error_mark_node. */
5152 has_designator_problem (reshape_iter *d, tsubst_flags_t complain)
5156 if (complain & tf_error)
5157 error ("C99 designator %qE outside aggregate initializer",
5165 /* Subroutine of reshape_init, which processes a single initializer (part of
5166 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5167 iterator within the CONSTRUCTOR which points to the initializer to process.
5168 FIRST_INITIALIZER_P is true if this is the first initializer of the
5169 outermost CONSTRUCTOR node. */
5172 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5173 tsubst_flags_t complain)
5175 tree init = d->cur->value;
5177 if (error_operand_p (init))
5178 return error_mark_node;
5180 if (first_initializer_p && !CP_AGGREGATE_TYPE_P (type)
5181 && has_designator_problem (d, complain))
5182 return error_mark_node;
5184 if (TREE_CODE (type) == COMPLEX_TYPE)
5186 /* A complex type can be initialized from one or two initializers,
5187 but braces are not elided. */
5189 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5191 if (CONSTRUCTOR_NELTS (init) > 2)
5193 if (complain & tf_error)
5194 error ("too many initializers for %qT", type);
5196 return error_mark_node;
5199 else if (first_initializer_p && d->cur != d->end)
5201 VEC(constructor_elt, gc) *v = 0;
5202 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5203 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5204 if (has_designator_problem (d, complain))
5205 return error_mark_node;
5207 init = build_constructor (init_list_type_node, v);
5212 /* A non-aggregate type is always initialized with a single
5214 if (!CP_AGGREGATE_TYPE_P (type))
5216 /* It is invalid to initialize a non-aggregate type with a
5217 brace-enclosed initializer before C++0x.
5218 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5219 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5220 a CONSTRUCTOR (with a record type). */
5221 if (TREE_CODE (init) == CONSTRUCTOR
5222 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5224 if (SCALAR_TYPE_P (type))
5226 if (complain & tf_error)
5227 error ("braces around scalar initializer for type %qT", type);
5228 init = error_mark_node;
5231 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5240 All implicit type conversions (clause _conv_) are considered when
5241 initializing the aggregate member with an initializer from an
5242 initializer-list. If the initializer can initialize a member,
5243 the member is initialized. Otherwise, if the member is itself a
5244 non-empty subaggregate, brace elision is assumed and the
5245 initializer is considered for the initialization of the first
5246 member of the subaggregate. */
5247 if (TREE_CODE (init) != CONSTRUCTOR
5248 /* But don't try this for the first initializer, since that would be
5249 looking through the outermost braces; A a2 = { a1 }; is not a
5250 valid aggregate initialization. */
5251 && !first_initializer_p
5252 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5253 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5259 /* [dcl.init.string]
5261 A char array (whether plain char, signed char, or unsigned char)
5262 can be initialized by a string-literal (optionally enclosed in
5263 braces); a wchar_t array can be initialized by a wide
5264 string-literal (optionally enclosed in braces). */
5265 if (TREE_CODE (type) == ARRAY_TYPE
5266 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5268 tree str_init = init;
5270 /* Strip one level of braces if and only if they enclose a single
5271 element (as allowed by [dcl.init.string]). */
5272 if (!first_initializer_p
5273 && TREE_CODE (str_init) == CONSTRUCTOR
5274 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5276 str_init = VEC_index (constructor_elt,
5277 CONSTRUCTOR_ELTS (str_init), 0)->value;
5280 /* If it's a string literal, then it's the initializer for the array
5281 as a whole. Otherwise, continue with normal initialization for
5282 array types (one value per array element). */
5283 if (TREE_CODE (str_init) == STRING_CST)
5285 if (has_designator_problem (d, complain))
5286 return error_mark_node;
5292 /* The following cases are about aggregates. If we are not within a full
5293 initializer already, and there is not a CONSTRUCTOR, it means that there
5294 is a missing set of braces (that is, we are processing the case for
5295 which reshape_init exists). */
5296 if (!first_initializer_p)
5298 if (TREE_CODE (init) == CONSTRUCTOR)
5300 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5301 /* There is no need to reshape pointer-to-member function
5302 initializers, as they are always constructed correctly
5303 by the front end. */
5305 else if (COMPOUND_LITERAL_P (init))
5306 /* For a nested compound literal, there is no need to reshape since
5307 brace elision is not allowed. Even if we decided to allow it,
5308 we should add a call to reshape_init in finish_compound_literal,
5309 before calling digest_init, so changing this code would still
5310 not be necessary. */
5311 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5315 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5316 return reshape_init (type, init, complain);
5320 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5324 /* Dispatch to specialized routines. */
5325 if (CLASS_TYPE_P (type))
5326 return reshape_init_class (type, d, first_initializer_p, complain);
5327 else if (TREE_CODE (type) == ARRAY_TYPE)
5328 return reshape_init_array (type, d, complain);
5329 else if (TREE_CODE (type) == VECTOR_TYPE)
5330 return reshape_init_vector (type, d, complain);
5335 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5336 brace-enclosed aggregate initializer.
5338 INIT is the CONSTRUCTOR containing the list of initializers describing
5339 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5340 It may not presently match the shape of the TYPE; for example:
5342 struct S { int a; int b; };
5343 struct S a[] = { 1, 2, 3, 4 };
5345 Here INIT will hold a VEC of four elements, rather than a
5346 VEC of two elements, each itself a VEC of two elements. This
5347 routine transforms INIT from the former form into the latter. The
5348 revised CONSTRUCTOR node is returned. */
5351 reshape_init (tree type, tree init, tsubst_flags_t complain)
5353 VEC(constructor_elt, gc) *v;
5357 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5359 v = CONSTRUCTOR_ELTS (init);
5361 /* An empty constructor does not need reshaping, and it is always a valid
5363 if (VEC_empty (constructor_elt, v))
5366 /* Recurse on this CONSTRUCTOR. */
5367 d.cur = VEC_index (constructor_elt, v, 0);
5368 d.end = d.cur + VEC_length (constructor_elt, v);
5370 new_init = reshape_init_r (type, &d, true, complain);
5371 if (new_init == error_mark_node)
5372 return error_mark_node;
5374 /* Make sure all the element of the constructor were used. Otherwise,
5375 issue an error about exceeding initializers. */
5378 if (complain & tf_error)
5379 error ("too many initializers for %qT", type);
5381 return error_mark_node;
5387 /* Verify array initializer. Returns true if errors have been reported. */
5390 check_array_initializer (tree decl, tree type, tree init)
5392 tree element_type = TREE_TYPE (type);
5394 /* The array type itself need not be complete, because the
5395 initializer may tell us how many elements are in the array.
5396 But, the elements of the array must be complete. */
5397 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5400 error ("elements of array %q#D have incomplete type", decl);
5402 error ("elements of array %q#T have incomplete type", type);
5405 /* It is not valid to initialize a VLA. */
5407 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5408 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5411 error ("variable-sized object %qD may not be initialized", decl);
5413 error ("variable-sized compound literal");
5419 /* Subroutine of check_initializer; args are passed down from that function.
5420 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5423 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5426 gcc_assert (stmts_are_full_exprs_p ());
5427 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5430 /* Verify INIT (the initializer for DECL), and record the
5431 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5432 grok_reference_init.
5434 If the return value is non-NULL, it is an expression that must be
5435 evaluated dynamically to initialize DECL. */
5438 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5440 tree type = TREE_TYPE (decl);
5441 tree init_code = NULL;
5442 tree extra_init = NULL_TREE;
5445 /* Things that are going to be initialized need to have complete
5447 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5449 if (DECL_HAS_VALUE_EXPR_P (decl))
5451 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5452 it doesn't have storage to be initialized. */
5453 gcc_assert (init == NULL_TREE);
5457 if (type == error_mark_node)
5458 /* We will have already complained. */
5461 if (TREE_CODE (type) == ARRAY_TYPE)
5463 if (check_array_initializer (decl, type, init))
5466 else if (!COMPLETE_TYPE_P (type))
5468 error ("%q#D has incomplete type", decl);
5469 TREE_TYPE (decl) = error_mark_node;
5473 /* There is no way to make a variable-sized class type in GNU C++. */
5474 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5476 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5478 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5479 if (SCALAR_TYPE_P (type))
5483 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5484 init = build_zero_init (type, NULL_TREE, false);
5486 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5488 error ("scalar object %qD requires one element in initializer",
5490 TREE_TYPE (decl) = error_mark_node;
5496 if (TREE_CODE (decl) == CONST_DECL)
5498 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5500 DECL_INITIAL (decl) = init;
5502 gcc_assert (init != NULL_TREE);
5505 else if (!init && DECL_REALLY_EXTERN (decl))
5507 else if (init || type_build_ctor_call (type)
5508 || TREE_CODE (type) == REFERENCE_TYPE)
5510 if (TREE_CODE (type) == REFERENCE_TYPE)
5512 init = grok_reference_init (decl, type, init, flags);
5513 flags |= LOOKUP_ALREADY_DIGESTED;
5516 check_for_uninitialized_const_var (decl);
5517 /* Do not reshape constructors of vectors (they don't need to be
5519 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5521 if (is_std_init_list (type))
5523 init = perform_implicit_conversion (type, init,
5524 tf_warning_or_error);
5525 flags |= LOOKUP_ALREADY_DIGESTED;
5527 else if (TYPE_NON_AGGREGATE_CLASS (type))
5529 /* Don't reshape if the class has constructors. */
5530 if (cxx_dialect == cxx98)
5531 error ("in C++98 %qD must be initialized by constructor, "
5535 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5537 error ("opaque vector types cannot be initialized");
5538 init = error_mark_node;
5542 init = reshape_init (type, init, tf_warning_or_error);
5543 if (SCALAR_TYPE_P (type))
5544 check_narrowing (type, init);
5548 /* If DECL has an array type without a specific bound, deduce the
5549 array size from the initializer. */
5550 maybe_deduce_size_from_array_init (decl, init);
5551 type = TREE_TYPE (decl);
5552 if (type == error_mark_node)
5555 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5556 && !(flags & LOOKUP_ALREADY_DIGESTED)
5557 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5558 && CP_AGGREGATE_TYPE_P (type)))
5560 init_code = build_aggr_init_full_exprs (decl, init, flags);
5562 /* If this is a constexpr initializer, expand_default_init will
5563 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5564 case, pull the initializer back out and pass it down into
5565 store_init_value. */
5566 while (TREE_CODE (init_code) == EXPR_STMT
5567 || TREE_CODE (init_code) == CONVERT_EXPR)
5568 init_code = TREE_OPERAND (init_code, 0);
5569 if (TREE_CODE (init_code) == INIT_EXPR)
5571 init = TREE_OPERAND (init_code, 1);
5572 init_code = NULL_TREE;
5573 /* Don't call digest_init; it's unnecessary and will complain
5574 about aggregate initialization of non-aggregate classes. */
5575 flags |= LOOKUP_ALREADY_DIGESTED;
5577 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5579 /* Declared constexpr, but no suitable initializer; massage
5580 init appropriately so we can pass it into store_init_value
5582 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5583 init = finish_compound_literal (type, init,
5584 tf_warning_or_error);
5585 else if (CLASS_TYPE_P (type)
5586 && (!init || TREE_CODE (init) == TREE_LIST))
5588 init = build_functional_cast (type, init, tf_none);
5589 if (init != error_mark_node)
5590 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5592 init_code = NULL_TREE;
5598 if (init && TREE_CODE (init) != TREE_VEC)
5600 /* In aggregate initialization of a variable, each element
5601 initialization is a full-expression because there is no
5602 enclosing expression. */
5603 gcc_assert (stmts_are_full_exprs_p ());
5605 init_code = store_init_value (decl, init, cleanups, flags);
5607 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5608 && DECL_INITIAL (decl)
5609 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5610 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5611 warning (0, "array %qD initialized by parenthesized string literal %qE",
5612 decl, DECL_INITIAL (decl));
5618 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5619 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5620 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5621 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5624 check_for_uninitialized_const_var (decl);
5627 if (init && init != error_mark_node)
5628 init_code = build2 (INIT_EXPR, type, decl, init);
5631 init_code = add_stmt_to_compound (extra_init, init_code);
5633 if (init_code && DECL_IN_AGGR_P (decl))
5635 static int explained = 0;
5637 if (cxx_dialect < cxx0x)
5638 error ("initializer invalid for static member with constructor");
5640 error ("non-constant in-class initialization invalid for static "
5641 "member %qD", decl);
5644 error ("(an out of class initialization is required)");
5652 /* If DECL is not a local variable, give it RTL. */
5655 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5657 int toplev = toplevel_bindings_p ();
5659 const char *filename;
5661 /* Set the DECL_ASSEMBLER_NAME for the object. */
5664 /* The `register' keyword, when used together with an
5665 asm-specification, indicates that the variable should be
5666 placed in a particular register. */
5667 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5669 set_user_assembler_name (decl, asmspec);
5670 DECL_HARD_REGISTER (decl) = 1;
5674 if (TREE_CODE (decl) == FUNCTION_DECL
5675 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5676 set_builtin_user_assembler_name (decl, asmspec);
5677 set_user_assembler_name (decl, asmspec);
5681 /* Handle non-variables up front. */
5682 if (TREE_CODE (decl) != VAR_DECL)
5684 rest_of_decl_compilation (decl, toplev, at_eof);
5688 /* If we see a class member here, it should be a static data
5690 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5692 gcc_assert (TREE_STATIC (decl));
5693 /* An in-class declaration of a static data member should be
5694 external; it is only a declaration, and not a definition. */
5695 if (init == NULL_TREE)
5696 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5699 /* We don't create any RTL for local variables. */
5700 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5703 /* We defer emission of local statics until the corresponding
5704 DECL_EXPR is expanded. */
5705 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5707 /* We try to defer namespace-scope static constants so that they are
5708 not emitted into the object file unnecessarily. */
5709 filename = input_filename;
5710 if (!DECL_VIRTUAL_P (decl)
5711 && TREE_READONLY (decl)
5712 && DECL_INITIAL (decl) != NULL_TREE
5713 && DECL_INITIAL (decl) != error_mark_node
5715 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5717 && !TREE_PUBLIC (decl))
5719 /* Fool with the linkage of static consts according to #pragma
5721 struct c_fileinfo *finfo = get_fileinfo (filename);
5722 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5724 TREE_PUBLIC (decl) = 1;
5725 DECL_EXTERNAL (decl) = finfo->interface_only;
5730 /* Likewise for template instantiations. */
5731 else if (DECL_LANG_SPECIFIC (decl)
5732 && DECL_IMPLICIT_INSTANTIATION (decl))
5735 /* If we're not deferring, go ahead and assemble the variable. */
5737 rest_of_decl_compilation (decl, toplev, at_eof);
5740 /* walk_tree helper for wrap_temporary_cleanups, below. */
5743 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5745 /* Stop at types or full-expression boundaries. */
5746 if (TYPE_P (*stmt_p)
5747 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5753 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5755 tree guard = (tree)data;
5756 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5758 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5759 /* Tell honor_protect_cleanup_actions to handle this as a separate
5761 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5763 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5769 /* We're initializing a local variable which has a cleanup GUARD. If there
5770 are any temporaries used in the initializer INIT of this variable, we
5771 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5772 variable will be cleaned up properly if one of them throws.
5774 Unfortunately, there's no way to express this properly in terms of
5775 nesting, as the regions for the temporaries overlap the region for the
5776 variable itself; if there are two temporaries, the variable needs to be
5777 the first thing destroyed if either of them throws. However, we only
5778 want to run the variable's cleanup if it actually got constructed. So
5779 we need to guard the temporary cleanups with the variable's cleanup if
5780 they are run on the normal path, but not if they are run on the
5781 exceptional path. We implement this by telling
5782 honor_protect_cleanup_actions to strip the variable cleanup from the
5783 exceptional path. */
5786 wrap_temporary_cleanups (tree init, tree guard)
5788 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5791 /* Generate code to initialize DECL (a local variable). */
5794 initialize_local_var (tree decl, tree init)
5796 tree type = TREE_TYPE (decl);
5800 gcc_assert (TREE_CODE (decl) == VAR_DECL
5801 || TREE_CODE (decl) == RESULT_DECL);
5802 gcc_assert (!TREE_STATIC (decl));
5804 if (DECL_SIZE (decl) == NULL_TREE)
5806 /* If we used it already as memory, it must stay in memory. */
5807 DECL_INITIAL (decl) = NULL_TREE;
5808 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5812 if (type == error_mark_node)
5815 /* Compute and store the initial value. */
5816 already_used = TREE_USED (decl) || TREE_USED (type);
5817 if (TREE_USED (type))
5818 DECL_READ_P (decl) = 1;
5820 /* Generate a cleanup, if necessary. */
5821 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5823 /* Perform the initialization. */
5826 if (TREE_CODE (init) == INIT_EXPR
5827 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5829 /* Stick simple initializers in DECL_INITIAL so that
5830 -Wno-init-self works (c++/34772). */
5831 gcc_assert (TREE_OPERAND (init, 0) == decl);
5832 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5836 int saved_stmts_are_full_exprs_p;
5838 /* If we're only initializing a single object, guard the
5839 destructors of any temporaries used in its initializer with
5840 its destructor. This isn't right for arrays because each
5841 element initialization is a full-expression. */
5842 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5843 wrap_temporary_cleanups (init, cleanup);
5845 gcc_assert (building_stmt_list_p ());
5846 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5847 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5848 finish_expr_stmt (init);
5849 current_stmt_tree ()->stmts_are_full_exprs_p =
5850 saved_stmts_are_full_exprs_p;
5854 /* Set this to 0 so we can tell whether an aggregate which was
5855 initialized was ever used. Don't do this if it has a
5856 destructor, so we don't complain about the 'resource
5857 allocation is initialization' idiom. Now set
5858 attribute((unused)) on types so decls of that type will be
5859 marked used. (see TREE_USED, above.) */
5860 if (TYPE_NEEDS_CONSTRUCTING (type)
5862 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5863 && DECL_NAME (decl))
5864 TREE_USED (decl) = 0;
5865 else if (already_used)
5866 TREE_USED (decl) = 1;
5869 finish_decl_cleanup (decl, cleanup);
5872 /* DECL is a VAR_DECL for a compiler-generated variable with static
5873 storage duration (like a virtual table) whose initializer is a
5874 compile-time constant. Initialize the variable and provide it to the
5878 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5881 gcc_assert (DECL_ARTIFICIAL (decl));
5882 init = build_constructor (TREE_TYPE (decl), v);
5883 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5884 DECL_INITIAL (decl) = init;
5885 DECL_INITIALIZED_P (decl) = 1;
5886 determine_visibility (decl);
5887 layout_var_decl (decl);
5888 maybe_commonize_var (decl);
5889 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5892 /* INIT is the initializer for a variable, as represented by the
5893 parser. Returns true iff INIT is type-dependent. */
5896 type_dependent_init_p (tree init)
5898 if (TREE_CODE (init) == TREE_LIST)
5899 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5900 return any_type_dependent_elements_p (init);
5901 else if (TREE_CODE (init) == CONSTRUCTOR)
5902 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5904 VEC(constructor_elt, gc) *elts;
5908 elts = CONSTRUCTOR_ELTS (init);
5909 nelts = VEC_length (constructor_elt, elts);
5910 for (i = 0; i < nelts; ++i)
5911 if (type_dependent_init_p (VEC_index (constructor_elt,
5916 /* It must be a simple expression, e.g., int i = 3; */
5917 return type_dependent_expression_p (init);
5922 /* INIT is the initializer for a variable, as represented by the
5923 parser. Returns true iff INIT is value-dependent. */
5926 value_dependent_init_p (tree init)
5928 if (TREE_CODE (init) == TREE_LIST)
5929 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5930 return any_value_dependent_elements_p (init);
5931 else if (TREE_CODE (init) == CONSTRUCTOR)
5932 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5934 VEC(constructor_elt, gc) *elts;
5938 elts = CONSTRUCTOR_ELTS (init);
5939 nelts = VEC_length (constructor_elt, elts);
5940 for (i = 0; i < nelts; ++i)
5941 if (value_dependent_init_p (VEC_index (constructor_elt,
5946 /* It must be a simple expression, e.g., int i = 3; */
5947 return value_dependent_expression_p (init);
5952 /* Finish processing of a declaration;
5953 install its line number and initial value.
5954 If the length of an array type is not known before,
5955 it must be determined now, from the initial value, or it is an error.
5957 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5958 true, then INIT is an integral constant expression.
5960 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5961 if the (init) syntax was used. */
5964 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5965 tree asmspec_tree, int flags)
5968 VEC(tree,gc) *cleanups = NULL;
5969 const char *asmspec = NULL;
5970 int was_readonly = 0;
5971 bool var_definition_p = false;
5974 if (decl == error_mark_node)
5979 error ("assignment (not initialization) in declaration");
5983 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5984 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5985 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5987 type = TREE_TYPE (decl);
5988 if (type == error_mark_node)
5991 /* If a name was specified, get the string. */
5992 if (at_namespace_scope_p ())
5993 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5994 if (asmspec_tree && asmspec_tree != error_mark_node)
5995 asmspec = TREE_STRING_POINTER (asmspec_tree);
5997 if (current_class_type
5998 && CP_DECL_CONTEXT (decl) == current_class_type
5999 && TYPE_BEING_DEFINED (current_class_type)
6000 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
6001 && (DECL_INITIAL (decl) || init))
6002 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
6004 auto_node = type_uses_auto (type);
6008 if (init == NULL_TREE)
6010 error ("declaration of %q#D has no initializer", decl);
6011 TREE_TYPE (decl) = error_mark_node;
6015 if (TREE_CODE (d_init) == TREE_LIST)
6016 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
6017 tf_warning_or_error);
6018 d_init = resolve_nondeduced_context (d_init);
6019 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
6021 if (type == error_mark_node)
6025 if (!ensure_literal_type_for_constexpr_object (decl))
6026 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
6028 if (TREE_CODE (decl) == VAR_DECL
6029 && DECL_CLASS_SCOPE_P (decl)
6030 && DECL_INITIALIZED_IN_CLASS_P (decl))
6031 check_static_variable_definition (decl, type);
6033 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6036 if (init == ridpointers[(int)RID_DELETE])
6038 /* FIXME check this is 1st decl. */
6039 DECL_DELETED_FN (decl) = 1;
6040 DECL_DECLARED_INLINE_P (decl) = 1;
6041 DECL_INITIAL (decl) = error_mark_node;
6042 FOR_EACH_CLONE (clone, decl)
6044 DECL_DELETED_FN (clone) = 1;
6045 DECL_DECLARED_INLINE_P (clone) = 1;
6046 DECL_INITIAL (clone) = error_mark_node;
6050 else if (init == ridpointers[(int)RID_DEFAULT])
6052 if (defaultable_fn_check (decl))
6053 DECL_DEFAULTED_FN (decl) = 1;
6055 DECL_INITIAL (decl) = NULL_TREE;
6059 if (init && TREE_CODE (decl) == VAR_DECL)
6061 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6062 /* If DECL is a reference, then we want to know whether init is a
6063 reference constant; init_const_expr_p as passed tells us whether
6064 it's an rvalue constant. */
6065 if (TREE_CODE (type) == REFERENCE_TYPE)
6066 init_const_expr_p = potential_constant_expression (init);
6067 if (init_const_expr_p)
6069 /* Set these flags now for templates. We'll update the flags in
6070 store_init_value for instantiations. */
6071 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6072 if (decl_maybe_constant_var_p (decl))
6073 TREE_CONSTANT (decl) = 1;
6077 if (processing_template_decl)
6079 bool type_dependent_p;
6081 /* Add this declaration to the statement-tree. */
6082 if (at_function_scope_p ())
6083 add_decl_expr (decl);
6085 type_dependent_p = dependent_type_p (type);
6087 if (check_for_bare_parameter_packs (init))
6090 DECL_INITIAL (decl) = NULL_TREE;
6093 /* Generally, initializers in templates are expanded when the
6094 template is instantiated. But, if DECL is a variable constant
6095 then it can be used in future constant expressions, so its value
6096 must be available. */
6098 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6099 /* We can't do anything if the decl has dependent type. */;
6101 && init_const_expr_p
6102 && !type_dependent_p
6103 && decl_maybe_constant_var_p (decl)
6104 && !type_dependent_init_p (init)
6105 && !value_dependent_init_p (init))
6107 /* This variable seems to be a non-dependent constant, so process
6108 its initializer. If check_initializer returns non-null the
6109 initialization wasn't constant after all. */
6111 cleanups = make_tree_vector ();
6112 init_code = check_initializer (decl, init, flags, &cleanups);
6113 if (init_code == NULL_TREE)
6115 release_tree_vector (cleanups);
6117 else if (!DECL_PRETTY_FUNCTION_P (decl))
6118 /* Deduce array size even if the initializer is dependent. */
6119 maybe_deduce_size_from_array_init (decl, init);
6122 DECL_INITIAL (decl) = init;
6126 /* Just store non-static data member initializers for later. */
6127 if (init && TREE_CODE (decl) == FIELD_DECL)
6128 DECL_INITIAL (decl) = init;
6130 /* Take care of TYPE_DECLs up front. */
6131 if (TREE_CODE (decl) == TYPE_DECL)
6133 if (type != error_mark_node
6134 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6136 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6137 warning (0, "shadowing previous type declaration of %q#D", decl);
6138 set_identifier_type_value (DECL_NAME (decl), decl);
6141 /* If we have installed this as the canonical typedef for this
6142 type, and that type has not been defined yet, delay emitting
6143 the debug information for it, as we will emit it later. */
6144 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6145 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6146 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6148 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6153 /* A reference will be modified here, as it is initialized. */
6154 if (! DECL_EXTERNAL (decl)
6155 && TREE_READONLY (decl)
6156 && TREE_CODE (type) == REFERENCE_TYPE)
6159 TREE_READONLY (decl) = 0;
6162 if (TREE_CODE (decl) == VAR_DECL)
6164 /* Only variables with trivial initialization and destruction can
6165 have thread-local storage. */
6166 if (DECL_THREAD_LOCAL_P (decl)
6167 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6168 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6169 error ("%qD cannot be thread-local because it has non-trivial "
6170 "type %qT", decl, TREE_TYPE (decl));
6171 /* If this is a local variable that will need a mangled name,
6172 register it now. We must do this before processing the
6173 initializer for the variable, since the initialization might
6174 require a guard variable, and since the mangled name of the
6175 guard variable will depend on the mangled name of this
6177 if (DECL_FUNCTION_SCOPE_P (decl)
6178 && TREE_STATIC (decl)
6179 && !DECL_ARTIFICIAL (decl))
6181 push_local_name (decl);
6182 if (DECL_CONSTRUCTOR_P (current_function_decl)
6183 || DECL_DESTRUCTOR_P (current_function_decl))
6184 /* Normally local_decls is populated during GIMPLE lowering,
6185 but [cd]tors are never actually compiled directly. We need
6186 to put statics on the list so we can deal with the label
6187 address extension. */
6188 add_local_decl (cfun, decl);
6191 /* Convert the initializer to the type of DECL, if we have not
6192 already initialized DECL. */
6193 if (!DECL_INITIALIZED_P (decl)
6194 /* If !DECL_EXTERNAL then DECL is being defined. In the
6195 case of a static data member initialized inside the
6196 class-specifier, there can be an initializer even if DECL
6197 is *not* defined. */
6198 && (!DECL_EXTERNAL (decl) || init))
6200 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6203 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6204 /* Allow libjava/prims.cc define primitive classes. */
6205 if (init != NULL_TREE
6206 || jclass == NULL_TREE
6207 || TREE_CODE (jclass) != TYPE_DECL
6208 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6209 || !same_type_ignoring_top_level_qualifiers_p
6210 (type, TREE_TYPE (TREE_TYPE (jclass))))
6211 error ("Java object %qD not allocated with %<new%>", decl);
6214 cleanups = make_tree_vector ();
6215 init = check_initializer (decl, init, flags, &cleanups);
6216 /* Thread-local storage cannot be dynamically initialized. */
6217 if (DECL_THREAD_LOCAL_P (decl) && init)
6219 error ("%qD is thread-local and so cannot be dynamically "
6220 "initialized", decl);
6224 /* Check that the initializer for a static data member was a
6225 constant. Although we check in the parser that the
6226 initializer is an integral constant expression, we do not
6227 simplify division-by-zero at the point at which it
6228 occurs. Therefore, in:
6230 struct S { static const int i = 7 / 0; };
6232 we issue an error at this point. It would
6233 probably be better to forbid division by zero in
6234 integral constant expressions. */
6235 if (DECL_EXTERNAL (decl) && init)
6237 error ("%qD cannot be initialized by a non-constant expression"
6238 " when being declared", decl);
6239 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6247 The memory occupied by any object of static storage
6248 duration is zero-initialized at program startup before
6249 any other initialization takes place.
6251 We cannot create an appropriate initializer until after
6252 the type of DECL is finalized. If DECL_INITIAL is set,
6253 then the DECL is statically initialized, and any
6254 necessary zero-initialization has already been performed. */
6255 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6256 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6257 /*nelts=*/NULL_TREE,
6258 /*static_storage_p=*/true);
6259 /* Remember that the initialization for this variable has
6261 DECL_INITIALIZED_P (decl) = 1;
6262 /* This declaration is the definition of this variable,
6263 unless we are initializing a static data member within
6264 the class specifier. */
6265 if (!DECL_EXTERNAL (decl))
6266 var_definition_p = true;
6268 /* If the variable has an array type, lay out the type, even if
6269 there is no initializer. It is valid to index through the
6270 array, and we must get TYPE_ALIGN set correctly on the array
6272 else if (TREE_CODE (type) == ARRAY_TYPE)
6275 if (TREE_STATIC (decl)
6276 && !at_function_scope_p ()
6277 && current_function_decl == NULL)
6278 /* So decl is a global variable or a static member of a
6279 non local class. Record the types it uses
6280 so that we can decide later to emit debug info for them. */
6281 record_types_used_by_current_var_decl (decl);
6283 else if (TREE_CODE (decl) == FIELD_DECL
6284 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6285 error ("non-static data member %qD has Java class type", decl);
6287 /* Add this declaration to the statement-tree. This needs to happen
6288 after the call to check_initializer so that the DECL_EXPR for a
6289 reference temp is added before the DECL_EXPR for the reference itself. */
6290 if (DECL_FUNCTION_SCOPE_P (decl))
6291 add_decl_expr (decl);
6293 /* Let the middle end know about variables and functions -- but not
6294 static data members in uninstantiated class templates. */
6295 if (TREE_CODE (decl) == VAR_DECL
6296 || TREE_CODE (decl) == FUNCTION_DECL)
6298 if (TREE_CODE (decl) == VAR_DECL)
6300 layout_var_decl (decl);
6301 maybe_commonize_var (decl);
6304 /* This needs to happen after the linkage is set. */
6305 determine_visibility (decl);
6307 if (var_definition_p && TREE_STATIC (decl))
6309 /* If a TREE_READONLY variable needs initialization
6310 at runtime, it is no longer readonly and we need to
6311 avoid MEM_READONLY_P being set on RTL created for it. */
6314 if (TREE_READONLY (decl))
6315 TREE_READONLY (decl) = 0;
6318 else if (was_readonly)
6319 TREE_READONLY (decl) = 1;
6322 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6324 /* Check for abstractness of the type. Notice that there is no
6325 need to strip array types here since the check for those types
6326 is already done within create_array_type_for_decl. */
6327 if (TREE_CODE (type) == FUNCTION_TYPE
6328 || TREE_CODE (type) == METHOD_TYPE)
6329 abstract_virtuals_error (decl, TREE_TYPE (type));
6331 abstract_virtuals_error (decl, type);
6333 if (TREE_TYPE (decl) == error_mark_node)
6334 /* No initialization required. */
6336 else if (TREE_CODE (decl) == FUNCTION_DECL)
6340 if (init == ridpointers[(int)RID_DEFAULT])
6342 /* An out-of-class default definition is defined at
6343 the point where it is explicitly defaulted. */
6344 if (DECL_DELETED_FN (decl))
6345 maybe_explain_implicit_delete (decl);
6346 else if (DECL_INITIAL (decl) == error_mark_node)
6347 synthesize_method (decl);
6350 error ("function %q#D is initialized like a variable", decl);
6352 /* else no initialization required. */
6354 else if (DECL_EXTERNAL (decl)
6355 && ! (DECL_LANG_SPECIFIC (decl)
6356 && DECL_NOT_REALLY_EXTERN (decl)))
6359 DECL_INITIAL (decl) = init;
6361 /* A variable definition. */
6362 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6363 /* Initialize the local variable. */
6364 initialize_local_var (decl, init);
6366 /* If a variable is defined, and then a subsequent
6367 definition with external linkage is encountered, we will
6368 get here twice for the same variable. We want to avoid
6369 calling expand_static_init more than once. For variables
6370 that are not static data members, we can call
6371 expand_static_init only when we actually process the
6372 initializer. It is not legal to redeclare a static data
6373 member, so this issue does not arise in that case. */
6374 else if (var_definition_p && TREE_STATIC (decl))
6375 expand_static_init (decl, init);
6378 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6379 reference, insert it in the statement-tree now. */
6383 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6384 push_cleanup (decl, t, false);
6385 release_tree_vector (cleanups);
6389 TREE_READONLY (decl) = 1;
6391 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6394 /* Returns a declaration for a VAR_DECL as if:
6396 extern "C" TYPE NAME;
6398 had been seen. Used to create compiler-generated global
6402 declare_global_var (tree name, tree type)
6406 push_to_top_level ();
6407 decl = build_decl (input_location, VAR_DECL, name, type);
6408 TREE_PUBLIC (decl) = 1;
6409 DECL_EXTERNAL (decl) = 1;
6410 DECL_ARTIFICIAL (decl) = 1;
6411 /* If the user has explicitly declared this variable (perhaps
6412 because the code we are compiling is part of a low-level runtime
6413 library), then it is possible that our declaration will be merged
6414 with theirs by pushdecl. */
6415 decl = pushdecl (decl);
6416 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6417 pop_from_top_level ();
6422 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6423 if "__cxa_atexit" is not being used) corresponding to the function
6424 to be called when the program exits. */
6427 get_atexit_fn_ptr_type (void)
6431 if (!atexit_fn_ptr_type_node)
6434 if (flag_use_cxa_atexit
6435 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6436 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6437 arg_type = ptr_type_node;
6439 /* The parameter to "atexit" is "void (*)(void)". */
6440 arg_type = NULL_TREE;
6442 fn_type = build_function_type_list (void_type_node,
6443 arg_type, NULL_TREE);
6444 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6447 return atexit_fn_ptr_type_node;
6450 /* Returns a pointer to the `atexit' function. Note that if
6451 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6452 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6455 get_atexit_node (void)
6461 bool use_aeabi_atexit;
6466 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6468 /* The declaration for `__cxa_atexit' is:
6470 int __cxa_atexit (void (*)(void *), void *, void *)
6472 We build up the argument types and then the function type
6474 tree argtype0, argtype1, argtype2;
6476 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6477 /* First, build the pointer-to-function type for the first
6479 fn_ptr_type = get_atexit_fn_ptr_type ();
6480 /* Then, build the rest of the argument types. */
6481 argtype2 = ptr_type_node;
6482 if (use_aeabi_atexit)
6484 argtype1 = fn_ptr_type;
6485 argtype0 = ptr_type_node;
6489 argtype1 = ptr_type_node;
6490 argtype0 = fn_ptr_type;
6492 /* And the final __cxa_atexit type. */
6493 fn_type = build_function_type_list (integer_type_node,
6494 argtype0, argtype1, argtype2,
6496 fn_ptr_type = build_pointer_type (fn_type);
6497 if (use_aeabi_atexit)
6498 name = "__aeabi_atexit";
6500 name = "__cxa_atexit";
6504 /* The declaration for `atexit' is:
6506 int atexit (void (*)());
6508 We build up the argument types and then the function type
6510 fn_ptr_type = get_atexit_fn_ptr_type ();
6511 /* Build the final atexit type. */
6512 fn_type = build_function_type_list (integer_type_node,
6513 fn_ptr_type, NULL_TREE);
6517 /* Now, build the function declaration. */
6518 push_lang_context (lang_name_c);
6519 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6520 mark_used (atexit_fndecl);
6521 pop_lang_context ();
6522 atexit_node = decay_conversion (atexit_fndecl);
6527 /* Returns the __dso_handle VAR_DECL. */
6530 get_dso_handle_node (void)
6532 if (dso_handle_node)
6533 return dso_handle_node;
6535 /* Declare the variable. */
6536 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6539 #ifdef HAVE_GAS_HIDDEN
6540 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6541 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6544 return dso_handle_node;
6547 /* Begin a new function with internal linkage whose job will be simply
6548 to destroy some particular variable. */
6550 static GTY(()) int start_cleanup_cnt;
6553 start_cleanup_fn (void)
6558 bool use_cxa_atexit = flag_use_cxa_atexit
6559 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6561 push_to_top_level ();
6563 /* No need to mangle this. */
6564 push_lang_context (lang_name_c);
6566 /* Build the name of the function. */
6567 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6568 /* Build the function declaration. */
6569 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6570 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6571 /* It's a function with internal linkage, generated by the
6573 TREE_PUBLIC (fndecl) = 0;
6574 DECL_ARTIFICIAL (fndecl) = 1;
6575 /* Make the function `inline' so that it is only emitted if it is
6576 actually needed. It is unlikely that it will be inlined, since
6577 it is only called via a function pointer, but we avoid unnecessary
6578 emissions this way. */
6579 DECL_DECLARED_INLINE_P (fndecl) = 1;
6580 DECL_INTERFACE_KNOWN (fndecl) = 1;
6581 /* Build the parameter. */
6586 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6587 DECL_CONTEXT (parmdecl) = fndecl;
6588 TREE_USED (parmdecl) = 1;
6589 DECL_READ_P (parmdecl) = 1;
6590 DECL_ARGUMENTS (fndecl) = parmdecl;
6594 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6596 pop_lang_context ();
6598 return current_function_decl;
6601 /* Finish the cleanup function begun by start_cleanup_fn. */
6604 end_cleanup_fn (void)
6606 expand_or_defer_fn (finish_function (0));
6608 pop_from_top_level ();
6611 /* Generate code to handle the destruction of DECL, an object with
6612 static storage duration. */
6615 register_dtor_fn (tree decl)
6622 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6624 type = TREE_TYPE (decl);
6625 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6626 return void_zero_node;
6628 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6629 a class object, we can just pass the destructor to
6630 "__cxa_atexit"; we don't have to build a temporary function to do
6632 use_dtor = (flag_use_cxa_atexit
6633 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6634 && CLASS_TYPE_P (type));
6639 /* Find the destructor. */
6640 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6641 gcc_assert (idx >= 0);
6642 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6643 /* Make sure it is accessible. */
6644 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6648 /* Call build_cleanup before we enter the anonymous function so
6649 that any access checks will be done relative to the current
6650 scope, rather than the scope of the anonymous function. */
6651 build_cleanup (decl);
6653 /* Now start the function. */
6654 cleanup = start_cleanup_fn ();
6656 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6657 to the original function, rather than the anonymous one. That
6658 will make the back end think that nested functions are in use,
6659 which causes confusion. */
6660 push_deferring_access_checks (dk_no_check);
6661 fcall = build_cleanup (decl);
6662 pop_deferring_access_checks ();
6664 /* Create the body of the anonymous function. */
6665 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6666 finish_expr_stmt (fcall);
6667 finish_compound_stmt (compound_stmt);
6671 /* Call atexit with the cleanup function. */
6672 mark_used (cleanup);
6673 cleanup = build_address (cleanup);
6674 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6680 /* We must convert CLEANUP to the type that "__cxa_atexit"
6682 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6683 /* "__cxa_atexit" will pass the address of DECL to the
6684 cleanup function. */
6686 addr = build_address (decl);
6687 /* The declared type of the parameter to "__cxa_atexit" is
6688 "void *". For plain "T*", we could just let the
6689 machinery in cp_build_function_call convert it -- but if the
6690 type is "cv-qualified T *", then we need to convert it
6691 before passing it in, to avoid spurious errors. */
6692 addr = build_nop (ptr_type_node, addr);
6695 /* Since the cleanup functions we build ignore the address
6696 they're given, there's no reason to pass the actual address
6697 in, and, in general, it's cheaper to pass NULL than any
6699 addr = null_pointer_node;
6700 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6701 tf_warning_or_error);
6702 if (targetm.cxx.use_aeabi_atexit ())
6715 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6716 arg0, arg1, arg2, NULL_TREE);
6719 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6720 is its initializer. Generate code to handle the construction
6721 and destruction of DECL. */
6724 expand_static_init (tree decl, tree init)
6726 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6727 gcc_assert (TREE_STATIC (decl));
6729 /* Some variables require no dynamic initialization. */
6731 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6734 if (DECL_FUNCTION_SCOPE_P (decl))
6736 /* Emit code to perform this initialization but once. */
6737 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6738 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6739 tree guard, guard_addr;
6742 /* Emit code to perform this initialization but once. This code
6745 static <type> guard;
6746 if (!guard.first_byte) {
6747 if (__cxa_guard_acquire (&guard)) {
6750 // Do initialization.
6751 flag = true; __cxa_guard_release (&guard);
6752 // Register variable for destruction at end of program.
6754 if (!flag) __cxa_guard_abort (&guard);
6758 Note that the `flag' variable is only set to 1 *after* the
6759 initialization is complete. This ensures that an exception,
6760 thrown during the construction, will cause the variable to
6761 reinitialized when we pass through this code again, as per:
6765 If the initialization exits by throwing an exception, the
6766 initialization is not complete, so it will be tried again
6767 the next time control enters the declaration.
6769 This process should be thread-safe, too; multiple threads
6770 should not be able to initialize the variable more than
6773 /* Create the guard variable. */
6774 guard = get_guard (decl);
6776 /* This optimization isn't safe on targets with relaxed memory
6777 consistency. On such targets we force synchronization in
6778 __cxa_guard_acquire. */
6779 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6781 /* Begin the conditional initialization. */
6782 if_stmt = begin_if_stmt ();
6783 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6784 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6787 if (flag_threadsafe_statics)
6789 tree vfntype = NULL_TREE;
6790 tree acquire_name, release_name, abort_name;
6791 tree acquire_fn, release_fn, abort_fn;
6792 guard_addr = build_address (guard);
6794 acquire_name = get_identifier ("__cxa_guard_acquire");
6795 release_name = get_identifier ("__cxa_guard_release");
6796 abort_name = get_identifier ("__cxa_guard_abort");
6797 acquire_fn = identifier_global_value (acquire_name);
6798 release_fn = identifier_global_value (release_name);
6799 abort_fn = identifier_global_value (abort_name);
6801 acquire_fn = push_library_fn
6802 (acquire_name, build_function_type_list (integer_type_node,
6803 TREE_TYPE (guard_addr),
6806 if (!release_fn || !abort_fn)
6807 vfntype = build_function_type_list (void_type_node,
6808 TREE_TYPE (guard_addr),
6811 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6813 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6815 inner_if_stmt = begin_if_stmt ();
6816 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6819 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6820 begin = get_target_expr (boolean_false_node);
6821 flag = TARGET_EXPR_SLOT (begin);
6823 TARGET_EXPR_CLEANUP (begin)
6824 = build3 (COND_EXPR, void_type_node, flag,
6826 build_call_n (abort_fn, 1, guard_addr));
6827 CLEANUP_EH_ONLY (begin) = 1;
6829 /* Do the initialization itself. */
6830 init = add_stmt_to_compound (begin, init);
6831 init = add_stmt_to_compound
6832 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6833 init = add_stmt_to_compound
6834 (init, build_call_n (release_fn, 1, guard_addr));
6837 init = add_stmt_to_compound (init, set_guard (guard));
6839 /* Use atexit to register a function for destroying this static
6841 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6843 finish_expr_stmt (init);
6845 if (flag_threadsafe_statics)
6847 finish_compound_stmt (inner_then_clause);
6848 finish_then_clause (inner_if_stmt);
6849 finish_if_stmt (inner_if_stmt);
6852 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6854 finish_compound_stmt (then_clause);
6855 finish_then_clause (if_stmt);
6856 finish_if_stmt (if_stmt);
6860 static_aggregates = tree_cons (init, decl, static_aggregates);
6864 /* Make TYPE a complete type based on INITIAL_VALUE.
6865 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6866 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6867 3 if the initializer list is empty (in pedantic mode). */
6870 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6873 tree type, elt_type;
6877 unsigned HOST_WIDE_INT i;
6880 /* An array of character type can be initialized from a
6881 brace-enclosed string constant.
6883 FIXME: this code is duplicated from reshape_init. Probably
6884 we should just call reshape_init here? */
6885 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6886 && TREE_CODE (initial_value) == CONSTRUCTOR
6887 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6889 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6890 tree value = VEC_index (constructor_elt, v, 0)->value;
6892 if (TREE_CODE (value) == STRING_CST
6893 && VEC_length (constructor_elt, v) == 1)
6894 initial_value = value;
6897 /* If any of the elements are parameter packs, we can't actually
6898 complete this type now because the array size is dependent. */
6899 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6901 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6904 if (PACK_EXPANSION_P (value))
6910 failure = complete_array_type (ptype, initial_value, do_default);
6912 /* We can create the array before the element type is complete, which
6913 means that we didn't have these two bits set in the original type
6914 either. In completing the type, we are expected to propagate these
6915 bits. See also complete_type which does the same thing for arrays
6918 if (TYPE_DOMAIN (type))
6920 elt_type = TREE_TYPE (type);
6921 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6922 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6923 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6929 /* As above, but either give an error or reject zero-size arrays, depending
6933 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6934 bool do_default, tsubst_flags_t complain)
6937 bool sfinae = !(complain & tf_error);
6938 /* In SFINAE context we can't be lenient about zero-size arrays. */
6941 failure = cp_complete_array_type (ptype, initial_value, do_default);
6947 /* Not an error. */;
6948 else if (failure == 1)
6949 error ("initializer fails to determine size of %qT", *ptype);
6950 else if (failure == 2)
6953 error ("array size missing in %qT", *ptype);
6955 else if (failure == 3)
6956 error ("zero-size array %qT", *ptype);
6957 *ptype = error_mark_node;
6962 /* Return zero if something is declared to be a member of type
6963 CTYPE when in the context of CUR_TYPE. STRING is the error
6964 message to print in that case. Otherwise, quietly return 1. */
6967 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6969 if (ctype && ctype != cur_type)
6971 if (flags == DTOR_FLAG)
6972 error ("destructor for alien class %qT cannot be a member", ctype);
6974 error ("constructor for alien class %qT cannot be a member", ctype);
6980 /* Subroutine of `grokdeclarator'. */
6982 /* Generate errors possibly applicable for a given set of specifiers.
6983 This is for ARM $7.1.2. */
6986 bad_specifiers (tree object,
6987 enum bad_spec_place type,
6998 error ("%qD declared as a %<virtual%> variable", object);
7000 error ("%qD declared as an %<inline%> variable", object);
7002 error ("%<const%> and %<volatile%> function specifiers on "
7003 "%qD invalid in variable declaration", object);
7007 error ("%qD declared as a %<virtual%> parameter", object);
7009 error ("%qD declared as an %<inline%> parameter", object);
7011 error ("%<const%> and %<volatile%> function specifiers on "
7012 "%qD invalid in parameter declaration", object);
7016 error ("%qD declared as a %<virtual%> type", object);
7018 error ("%qD declared as an %<inline%> type", object);
7020 error ("%<const%> and %<volatile%> function specifiers on "
7021 "%qD invalid in type declaration", object);
7025 error ("%qD declared as a %<virtual%> field", object);
7027 error ("%qD declared as an %<inline%> field", object);
7029 error ("%<const%> and %<volatile%> function specifiers on "
7030 "%qD invalid in field declaration", object);
7036 error ("%q+D declared as a friend", object);
7038 && (TREE_CODE (object) == TYPE_DECL
7039 || (!TYPE_PTRFN_P (TREE_TYPE (object))
7040 && !TYPE_REFFN_P (TREE_TYPE (object))
7041 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7042 error ("%q+D declared with an exception specification", object);
7045 /* DECL is a member function or static data member and is presently
7046 being defined. Check that the definition is taking place in a
7050 check_class_member_definition_namespace (tree decl)
7052 /* These checks only apply to member functions and static data
7054 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7055 || TREE_CODE (decl) == VAR_DECL);
7056 /* We check for problems with specializations in pt.c in
7057 check_specialization_namespace, where we can issue better
7059 if (processing_specialization)
7061 /* There are no restrictions on the placement of
7062 explicit instantiations. */
7063 if (processing_explicit_instantiation)
7067 A member function definition that appears outside of the
7068 class definition shall appear in a namespace scope enclosing
7069 the class definition.
7073 The definition for a static data member shall appear in a
7074 namespace scope enclosing the member's class definition. */
7075 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7076 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7077 decl, DECL_CONTEXT (decl));
7080 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7081 METHOD_TYPE for a non-static member function; QUALS are the
7082 cv-qualifiers that apply to the function. */
7085 build_this_parm (tree type, cp_cv_quals quals)
7090 cp_cv_quals this_quals;
7092 if (CLASS_TYPE_P (type))
7095 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7096 this_type = build_pointer_type (this_type);
7099 this_type = type_of_this_parm (type);
7100 /* The `this' parameter is implicitly `const'; it cannot be
7102 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7103 qual_type = cp_build_qualified_type (this_type, this_quals);
7104 parm = build_artificial_parm (this_identifier, qual_type);
7105 cp_apply_type_quals_to_decl (this_quals, parm);
7109 /* DECL is a static member function. Complain if it was declared
7110 with function-cv-quals. */
7113 check_static_quals (tree decl, cp_cv_quals quals)
7115 if (quals != TYPE_UNQUALIFIED)
7116 error ("static member function %q#D declared with type qualifiers",
7120 /* CTYPE is class type, or null if non-class.
7121 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7123 DECLARATOR is the function's name.
7124 PARMS is a chain of PARM_DECLs for the function.
7125 VIRTUALP is truthvalue of whether the function is virtual or not.
7126 FLAGS are to be passed through to `grokclassfn'.
7127 QUALS are qualifiers indicating whether the function is `const'
7129 RAISES is a list of exceptions that this function can raise.
7130 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7131 not look, and -1 if we should not call `grokclassfn' at all.
7133 SFK is the kind of special function (if any) for the new function.
7135 Returns `NULL_TREE' if something goes wrong, after issuing
7136 applicable error messages. */
7139 grokfndecl (tree ctype,
7143 tree orig_declarator,
7145 enum overload_flags flags,
7152 special_function_kind sfk,
7157 location_t location)
7160 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7164 type = build_exception_variant (type, raises);
7166 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7168 /* If we have an explicit location, use it, otherwise use whatever
7169 build_lang_decl used (probably input_location). */
7170 if (location != UNKNOWN_LOCATION)
7171 DECL_SOURCE_LOCATION (decl) = location;
7173 if (TREE_CODE (type) == METHOD_TYPE)
7176 parm = build_this_parm (type, quals);
7177 DECL_CHAIN (parm) = parms;
7180 DECL_ARGUMENTS (decl) = parms;
7181 for (t = parms; t; t = DECL_CHAIN (t))
7182 DECL_CONTEXT (t) = decl;
7183 /* Propagate volatile out from type to decl. */
7184 if (TYPE_VOLATILE (type))
7185 TREE_THIS_VOLATILE (decl) = 1;
7187 /* Setup decl according to sfk. */
7190 case sfk_constructor:
7191 case sfk_copy_constructor:
7192 case sfk_move_constructor:
7193 DECL_CONSTRUCTOR_P (decl) = 1;
7195 case sfk_destructor:
7196 DECL_DESTRUCTOR_P (decl) = 1;
7202 /* If pointers to member functions use the least significant bit to
7203 indicate whether a function is virtual, ensure a pointer
7204 to this function will have that bit clear. */
7205 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7206 && TREE_CODE (type) == METHOD_TYPE
7207 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7208 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7211 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7215 ("defining explicit specialization %qD in friend declaration",
7219 tree fns = TREE_OPERAND (orig_declarator, 0);
7220 tree args = TREE_OPERAND (orig_declarator, 1);
7222 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7224 /* Something like `template <class T> friend void f<T>()'. */
7225 error ("invalid use of template-id %qD in declaration "
7226 "of primary template",
7232 /* A friend declaration of the form friend void f<>(). Record
7233 the information in the TEMPLATE_ID_EXPR. */
7234 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7236 if (TREE_CODE (fns) == COMPONENT_REF)
7238 /* Due to bison parser ickiness, we will have already looked
7239 up an operator_name or PFUNCNAME within the current class
7240 (see template_id in parse.y). If the current class contains
7241 such a name, we'll get a COMPONENT_REF here. Undo that. */
7243 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7244 == current_class_type);
7245 fns = TREE_OPERAND (fns, 1);
7247 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7248 || TREE_CODE (fns) == OVERLOAD);
7249 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7251 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7252 if (TREE_PURPOSE (t)
7253 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7255 error ("default arguments are not allowed in declaration "
7256 "of friend template specialization %qD",
7263 error ("%<inline%> is not allowed in declaration of friend "
7264 "template specialization %qD",
7271 /* If this decl has namespace scope, set that up. */
7273 set_decl_namespace (decl, in_namespace, friendp);
7275 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7277 /* `main' and builtins have implicit 'C' linkage. */
7278 if ((MAIN_NAME_P (declarator)
7279 || (IDENTIFIER_LENGTH (declarator) > 10
7280 && IDENTIFIER_POINTER (declarator)[0] == '_'
7281 && IDENTIFIER_POINTER (declarator)[1] == '_'
7282 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7283 && current_lang_name == lang_name_cplusplus
7284 && ctype == NULL_TREE
7285 && DECL_FILE_SCOPE_P (decl))
7286 SET_DECL_LANGUAGE (decl, lang_c);
7288 /* Should probably propagate const out from type to decl I bet (mrs). */
7291 DECL_STATIC_FUNCTION_P (decl) = 1;
7292 DECL_CONTEXT (decl) = ctype;
7297 DECL_CONTEXT (decl) = ctype;
7299 check_class_member_definition_namespace (decl);
7302 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7304 if (processing_template_decl)
7305 error ("cannot declare %<::main%> to be a template");
7307 error ("cannot declare %<::main%> to be inline");
7309 error ("cannot declare %<::main%> to be static");
7314 /* Members of anonymous types and local classes have no linkage; make
7315 them internal. If a typedef is made later, this will be changed. */
7316 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7317 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7320 if (publicp && cxx_dialect == cxx98)
7322 /* [basic.link]: A name with no linkage (notably, the name of a class
7323 or enumeration declared in a local scope) shall not be used to
7324 declare an entity with linkage.
7326 DR 757 relaxes this restriction for C++0x. */
7327 t = no_linkage_check (TREE_TYPE (decl),
7328 /*relaxed_p=*/false);
7331 if (TYPE_ANONYMOUS_P (t))
7333 if (DECL_EXTERN_C_P (decl))
7334 /* Allow this; it's pretty common in C. */;
7337 permerror (input_location, "anonymous type with no linkage "
7338 "used to declare function %q#D with linkage",
7340 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7341 permerror (input_location, "%q+#D does not refer to the unqualified "
7342 "type, so it is not used for linkage",
7347 permerror (input_location, "type %qT with no linkage used to "
7348 "declare function %q#D with linkage", t, decl);
7352 TREE_PUBLIC (decl) = publicp;
7355 DECL_INTERFACE_KNOWN (decl) = 1;
7356 DECL_NOT_REALLY_EXTERN (decl) = 1;
7359 /* If the declaration was declared inline, mark it as such. */
7361 DECL_DECLARED_INLINE_P (decl) = 1;
7363 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7365 DECL_EXTERNAL (decl) = 1;
7366 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7369 ? G_("static member function %qD cannot have cv-qualifier")
7370 : G_("non-member function %qD cannot have cv-qualifier"),
7372 quals = TYPE_UNQUALIFIED;
7375 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7376 && !grok_op_properties (decl, /*complain=*/true))
7378 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7380 bool long_long_unsigned_p;
7382 const char *suffix = NULL;
7383 /* [over.literal]/6: Literal operators shall not have C linkage. */
7384 if (DECL_LANGUAGE (decl) == lang_c)
7386 error ("literal operator with C linkage");
7390 if (DECL_NAMESPACE_SCOPE_P (decl))
7392 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7395 error ("%qD has invalid argument list", decl);
7399 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7400 if (long_long_unsigned_p)
7402 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7403 warning (0, "integer suffix %<%s%>"
7404 " shadowed by implementation", suffix);
7406 else if (long_double_p)
7408 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7409 warning (0, "floating point suffix %<%s%>"
7410 " shadowed by implementation", suffix);
7415 error ("%qD must be a non-member function", decl);
7421 /* Make the init_value nonzero so pushdecl knows this is not
7422 tentative. error_mark_node is replaced later with the BLOCK. */
7423 DECL_INITIAL (decl) = error_mark_node;
7425 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7426 TREE_NOTHROW (decl) = 1;
7428 /* Caller will do the rest of this. */
7432 if (ctype != NULL_TREE)
7433 grokclassfn (ctype, decl, flags);
7435 decl = check_explicit_specialization (orig_declarator, decl,
7438 4 * (friendp != 0));
7439 if (decl == error_mark_node)
7442 if (DECL_STATIC_FUNCTION_P (decl))
7443 check_static_quals (decl, quals);
7447 cplus_decl_attributes (&decl, *attrlist, 0);
7448 *attrlist = NULL_TREE;
7451 /* Check main's type after attributes have been applied. */
7452 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7454 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7457 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7459 error ("%<::main%> must return %<int%>");
7460 newtype = build_function_type (integer_type_node, oldtypeargs);
7461 TREE_TYPE (decl) = newtype;
7464 check_main_parameter_types (decl);
7467 if (ctype != NULL_TREE
7468 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7471 tree old_decl = check_classfn (ctype, decl,
7472 (processing_template_decl
7473 > template_class_depth (ctype))
7474 ? current_template_parms
7477 if (old_decl == error_mark_node)
7485 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7486 /* Because grokfndecl is always supposed to return a
7487 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7488 here. We depend on our callers to figure out that its
7489 really a template that's being returned. */
7490 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7492 if (DECL_STATIC_FUNCTION_P (old_decl)
7493 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7495 /* Remove the `this' parm added by grokclassfn. */
7496 revert_static_member_fn (decl);
7497 check_static_quals (decl, quals);
7499 if (DECL_ARTIFICIAL (old_decl))
7501 error ("definition of implicitly-declared %qD", old_decl);
7504 else if (DECL_DEFAULTED_FN (old_decl))
7506 error ("definition of explicitly-defaulted %q+D", decl);
7507 error ("%q+#D explicitly defaulted here", old_decl);
7511 /* Since we've smashed OLD_DECL to its
7512 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7513 if (TREE_CODE (decl) == TEMPLATE_DECL)
7514 decl = DECL_TEMPLATE_RESULT (decl);
7516 /* Attempt to merge the declarations. This can fail, in
7517 the case of some invalid specialization declarations. */
7518 pushed_scope = push_scope (ctype);
7519 ok = duplicate_decls (decl, old_decl, friendp);
7521 pop_scope (pushed_scope);
7524 error ("no %q#D member function declared in class %qT",
7532 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7535 if (ctype == NULL_TREE || check)
7539 DECL_VIRTUAL_P (decl) = 1;
7544 /* decl is a FUNCTION_DECL.
7545 specifiers are the parsed virt-specifiers.
7547 Set flags to reflect the virt-specifiers.
7552 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7554 if (decl == NULL_TREE)
7556 if (specifiers & VIRT_SPEC_OVERRIDE)
7557 DECL_OVERRIDE_P (decl) = 1;
7558 if (specifiers & VIRT_SPEC_FINAL)
7559 DECL_FINAL_P (decl) = 1;
7563 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7564 the linkage that DECL will receive in the object file. */
7567 set_linkage_for_static_data_member (tree decl)
7569 /* A static data member always has static storage duration and
7570 external linkage. Note that static data members are forbidden in
7571 local classes -- the only situation in which a class has
7572 non-external linkage. */
7573 TREE_PUBLIC (decl) = 1;
7574 TREE_STATIC (decl) = 1;
7575 /* For non-template classes, static data members are always put
7576 out in exactly those files where they are defined, just as
7577 with ordinary namespace-scope variables. */
7578 if (!processing_template_decl)
7579 DECL_INTERFACE_KNOWN (decl) = 1;
7582 /* Create a VAR_DECL named NAME with the indicated TYPE.
7584 If SCOPE is non-NULL, it is the class type or namespace containing
7585 the variable. If SCOPE is NULL, the variable should is created in
7586 the innermost enclosings scope. */
7589 grokvardecl (tree type,
7591 const cp_decl_specifier_seq *declspecs,
7597 tree explicit_scope;
7599 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7601 /* Compute the scope in which to place the variable, but remember
7602 whether or not that scope was explicitly specified by the user. */
7603 explicit_scope = scope;
7606 /* An explicit "extern" specifier indicates a namespace-scope
7608 if (declspecs->storage_class == sc_extern)
7609 scope = current_decl_namespace ();
7610 else if (!at_function_scope_p ())
7611 scope = current_scope ();
7615 && (/* If the variable is a namespace-scope variable declared in a
7616 template, we need DECL_LANG_SPECIFIC. */
7617 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7618 /* Similarly for namespace-scope variables with language linkage
7620 || (TREE_CODE (scope) == NAMESPACE_DECL
7621 && current_lang_name != lang_name_cplusplus)
7622 /* Similarly for static data members. */
7624 decl = build_lang_decl (VAR_DECL, name, type);
7626 decl = build_decl (input_location, VAR_DECL, name, type);
7628 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7629 set_decl_namespace (decl, explicit_scope, 0);
7631 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7633 if (declspecs->storage_class == sc_extern)
7635 DECL_THIS_EXTERN (decl) = 1;
7636 DECL_EXTERNAL (decl) = !initialized;
7639 if (DECL_CLASS_SCOPE_P (decl))
7641 set_linkage_for_static_data_member (decl);
7642 /* This function is only called with out-of-class definitions. */
7643 DECL_EXTERNAL (decl) = 0;
7644 check_class_member_definition_namespace (decl);
7646 /* At top level, either `static' or no s.c. makes a definition
7647 (perhaps tentative), and absence of `static' makes it public. */
7648 else if (toplevel_bindings_p ())
7650 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7651 && (DECL_THIS_EXTERN (decl) || ! constp));
7652 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7654 /* Not at top level, only `static' makes a static definition. */
7657 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7658 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7661 if (declspecs->specs[(int)ds_thread])
7662 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7664 /* If the type of the decl has no linkage, make sure that we'll
7665 notice that in mark_used. */
7666 if (cxx_dialect > cxx98
7667 && decl_linkage (decl) != lk_none
7668 && DECL_LANG_SPECIFIC (decl) == NULL
7669 && !DECL_EXTERN_C_P (decl)
7670 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7671 retrofit_lang_decl (decl);
7673 if (TREE_PUBLIC (decl))
7675 /* [basic.link]: A name with no linkage (notably, the name of a class
7676 or enumeration declared in a local scope) shall not be used to
7677 declare an entity with linkage.
7679 DR 757 relaxes this restriction for C++0x. */
7680 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7681 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7684 if (TYPE_ANONYMOUS_P (t))
7686 if (DECL_EXTERN_C_P (decl))
7687 /* Allow this; it's pretty common in C. */
7691 /* DRs 132, 319 and 389 seem to indicate types with
7692 no linkage can only be used to declare extern "C"
7693 entities. Since it's not always an error in the
7694 ISO C++ 90 Standard, we only issue a warning. */
7695 warning (0, "anonymous type with no linkage used to declare "
7696 "variable %q#D with linkage", decl);
7697 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7698 warning (0, "%q+#D does not refer to the unqualified "
7699 "type, so it is not used for linkage",
7704 warning (0, "type %qT with no linkage used to declare variable "
7705 "%q#D with linkage", t, decl);
7709 DECL_INTERFACE_KNOWN (decl) = 1;
7714 /* Create and return a canonical pointer to member function type, for
7715 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7718 build_ptrmemfunc_type (tree type)
7722 tree unqualified_variant = NULL_TREE;
7724 if (type == error_mark_node)
7727 /* If a canonical type already exists for this type, use it. We use
7728 this method instead of type_hash_canon, because it only does a
7729 simple equality check on the list of field members. */
7731 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7734 /* Make sure that we always have the unqualified pointer-to-member
7736 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7738 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7740 t = make_class_type (RECORD_TYPE);
7741 xref_basetypes (t, NULL_TREE);
7743 /* Let the front end know this is a pointer to member function... */
7744 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7745 /* ... and not really a class type. */
7746 SET_CLASS_TYPE_P (t, 0);
7748 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7751 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7753 DECL_CHAIN (field) = fields;
7756 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7758 /* Zap out the name so that the back end will give us the debugging
7759 information for this anonymous RECORD_TYPE. */
7760 TYPE_NAME (t) = NULL_TREE;
7762 /* If this is not the unqualified form of this pointer-to-member
7763 type, set the TYPE_MAIN_VARIANT for this type to be the
7764 unqualified type. Since they are actually RECORD_TYPEs that are
7765 not variants of each other, we must do this manually.
7766 As we just built a new type there is no need to do yet another copy. */
7767 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7769 int type_quals = cp_type_quals (type);
7770 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7771 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7772 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7773 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7774 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7775 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7776 TREE_TYPE (TYPE_BINFO (t)) = t;
7779 /* Cache this pointer-to-member type so that we can find it again
7781 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7783 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7784 SET_TYPE_STRUCTURAL_EQUALITY (t);
7785 else if (TYPE_CANONICAL (type) != type)
7786 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7791 /* Create and return a pointer to data member type. */
7794 build_ptrmem_type (tree class_type, tree member_type)
7796 if (TREE_CODE (member_type) == METHOD_TYPE)
7798 cp_cv_quals quals = type_memfn_quals (member_type);
7799 member_type = build_memfn_type (member_type, class_type, quals);
7800 return build_ptrmemfunc_type (build_pointer_type (member_type));
7804 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7805 return build_offset_type (class_type, member_type);
7809 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7810 Check to see that the definition is valid. Issue appropriate error
7811 messages. Return 1 if the definition is particularly bad, or 0
7815 check_static_variable_definition (tree decl, tree type)
7817 /* Can't check yet if we don't know the type. */
7818 if (dependent_type_p (type))
7820 /* If DECL is declared constexpr, we'll do the appropriate checks
7821 in check_initializer. */
7822 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7824 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7826 if (!COMPLETE_TYPE_P (type))
7827 error ("in-class initialization of static data member %q#D of "
7828 "incomplete type", decl);
7829 else if (literal_type_p (type))
7830 permerror (input_location,
7831 "%<constexpr%> needed for in-class initialization of "
7832 "static data member %q#D of non-integral type", decl);
7834 error ("in-class initialization of static data member %q#D of "
7835 "non-literal type", decl);
7839 /* Motion 10 at San Diego: If a static const integral data member is
7840 initialized with an integral constant expression, the initializer
7841 may appear either in the declaration (within the class), or in
7842 the definition, but not both. If it appears in the class, the
7843 member is a member constant. The file-scope definition is always
7845 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7847 error ("invalid in-class initialization of static data member "
7848 "of non-integral type %qT",
7852 else if (!CP_TYPE_CONST_P (type))
7853 error ("ISO C++ forbids in-class initialization of non-const "
7854 "static member %qD",
7856 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7857 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7858 "%qD of non-integral type %qT", decl, type);
7863 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7864 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7865 expressions out into temporary variables so that walk_tree doesn't
7866 step into them (c++/15764). */
7869 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7871 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7872 tree expr = *expr_p;
7873 if (TREE_CODE (expr) == SAVE_EXPR)
7875 tree op = TREE_OPERAND (expr, 0);
7876 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7877 if (TREE_SIDE_EFFECTS (op))
7878 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7881 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7886 /* Entry point for the above. */
7889 stabilize_vla_size (tree size)
7891 struct pointer_set_t *pset = pointer_set_create ();
7892 /* Break out any function calls into temporary variables. */
7893 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7896 /* Given the SIZE (i.e., number of elements) in an array, compute an
7897 appropriate index type for the array. If non-NULL, NAME is the
7898 name of the thing being declared. */
7901 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7906 tree abi_1_itype = NULL_TREE;
7908 if (error_operand_p (size))
7909 return error_mark_node;
7911 type = TREE_TYPE (size);
7912 /* type_dependent_expression_p? */
7913 if (!dependent_type_p (type))
7915 mark_rvalue_use (size);
7917 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7918 && TREE_SIDE_EFFECTS (size))
7919 /* In C++98, we mark a non-constant array bound with a magic
7920 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7923 size = fold_non_dependent_expr (size);
7925 if (CLASS_TYPE_P (type)
7926 && CLASSTYPE_LITERAL_P (type))
7928 size = build_expr_type_conversion (WANT_INT, size, true);
7931 if (!(complain & tf_error))
7932 return error_mark_node;
7934 error ("size of array %qD has non-integral type %qT",
7937 error ("size of array has non-integral type %qT", type);
7938 size = integer_one_node;
7940 if (size == error_mark_node)
7941 return error_mark_node;
7942 type = TREE_TYPE (size);
7943 /* We didn't support this case in GCC 3.2, so don't bother
7944 trying to model it now in ABI v1. */
7945 abi_1_itype = error_mark_node;
7948 size = maybe_constant_value (size);
7949 if (!TREE_CONSTANT (size))
7953 if (error_operand_p (size))
7954 return error_mark_node;
7956 /* The array bound must be an integer type. */
7957 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7959 if (!(complain & tf_error))
7960 return error_mark_node;
7962 error ("size of array %qD has non-integral type %qT", name, type);
7964 error ("size of array has non-integral type %qT", type);
7965 size = integer_one_node;
7966 type = TREE_TYPE (size);
7970 /* A type is dependent if it is...an array type constructed from any
7971 dependent type or whose size is specified by a constant expression
7972 that is value-dependent. */
7973 /* We can only call value_dependent_expression_p on integral constant
7974 expressions; treat non-constant expressions as dependent, too. */
7975 if (processing_template_decl
7976 && (dependent_type_p (type)
7977 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7979 /* We cannot do any checking for a SIZE that isn't known to be
7980 constant. Just build the index type and mark that it requires
7981 structural equality checks. */
7982 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7983 size, integer_one_node));
7984 TYPE_DEPENDENT_P (itype) = 1;
7985 TYPE_DEPENDENT_P_VALID (itype) = 1;
7986 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7990 if (!abi_version_at_least (2) && processing_template_decl
7991 && abi_1_itype == NULL_TREE)
7992 /* For abi-1, we handled all instances in templates the same way,
7993 even when they were non-dependent. This affects the manglings
7994 produced. So, we do the normal checking for non-dependent
7995 sizes, but at the end we'll return the same type that abi-1
7996 would have, but with TYPE_CANONICAL set to the "right"
7997 value that the current ABI would provide. */
7998 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7999 osize, integer_one_node));
8001 /* Normally, the array-bound will be a constant. */
8002 if (TREE_CODE (size) == INTEGER_CST)
8004 /* Check to see if the array bound overflowed. Make that an
8005 error, no matter how generous we're being. */
8006 constant_expression_error (size);
8008 /* An array must have a positive number of elements. */
8009 if (INT_CST_LT (size, integer_zero_node))
8011 if (!(complain & tf_error))
8012 return error_mark_node;
8014 error ("size of array %qD is negative", name);
8016 error ("size of array is negative");
8017 size = integer_one_node;
8019 /* As an extension we allow zero-sized arrays. */
8020 else if (integer_zerop (size))
8022 if (!(complain & tf_error))
8023 /* We must fail if performing argument deduction (as
8024 indicated by the state of complain), so that
8025 another substitution can be found. */
8026 return error_mark_node;
8027 else if (in_system_header)
8028 /* Allow them in system headers because glibc uses them. */;
8030 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
8032 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
8035 else if (TREE_CONSTANT (size)
8036 /* We don't allow VLAs at non-function scopes, or during
8037 tentative template substitution. */
8038 || !at_function_scope_p () || !(complain & tf_error))
8040 if (!(complain & tf_error))
8041 return error_mark_node;
8042 /* `(int) &fn' is not a valid array bound. */
8044 error ("size of array %qD is not an integral constant-expression",
8047 error ("size of array is not an integral constant-expression");
8048 size = integer_one_node;
8050 else if (pedantic && warn_vla != 0)
8053 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8055 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8057 else if (warn_vla > 0)
8061 "variable length array %qD is used", name);
8064 "variable length array is used");
8067 if (processing_template_decl && !TREE_CONSTANT (size))
8068 /* A variable sized array. */
8069 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8072 HOST_WIDE_INT saved_processing_template_decl;
8074 /* Compute the index of the largest element in the array. It is
8075 one less than the number of elements in the array. We save
8076 and restore PROCESSING_TEMPLATE_DECL so that computations in
8077 cp_build_binary_op will be appropriately folded. */
8078 saved_processing_template_decl = processing_template_decl;
8079 processing_template_decl = 0;
8080 itype = cp_build_binary_op (input_location,
8082 cp_convert (ssizetype, size),
8083 cp_convert (ssizetype, integer_one_node),
8084 tf_warning_or_error);
8085 itype = fold (itype);
8086 processing_template_decl = saved_processing_template_decl;
8088 if (!TREE_CONSTANT (itype))
8089 /* A variable sized array. */
8090 itype = variable_size (itype);
8091 /* Make sure that there was no overflow when creating to a signed
8092 index type. (For example, on a 32-bit machine, an array with
8093 size 2^32 - 1 is too big.) */
8094 else if (TREE_CODE (itype) == INTEGER_CST
8095 && TREE_OVERFLOW (itype))
8097 if (!(complain & tf_error))
8098 return error_mark_node;
8099 error ("overflow in array dimension");
8100 TREE_OVERFLOW (itype) = 0;
8104 /* Create and return the appropriate index type. */
8105 if (abi_1_itype && abi_1_itype != error_mark_node)
8107 tree t = build_index_type (itype);
8108 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8109 itype = abi_1_itype;
8112 itype = build_index_type (itype);
8114 /* If the index type were dependent, we would have returned early, so
8115 remember that it isn't. */
8116 TYPE_DEPENDENT_P (itype) = 0;
8117 TYPE_DEPENDENT_P_VALID (itype) = 1;
8121 /* Returns the scope (if any) in which the entity declared by
8122 DECLARATOR will be located. If the entity was declared with an
8123 unqualified name, NULL_TREE is returned. */
8126 get_scope_of_declarator (const cp_declarator *declarator)
8128 while (declarator && declarator->kind != cdk_id)
8129 declarator = declarator->declarator;
8131 /* If the declarator-id is a SCOPE_REF, the scope in which the
8132 declaration occurs is the first operand. */
8134 && declarator->u.id.qualifying_scope)
8135 return declarator->u.id.qualifying_scope;
8137 /* Otherwise, the declarator is not a qualified name; the entity will
8138 be declared in the current scope. */
8142 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8143 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8147 create_array_type_for_decl (tree name, tree type, tree size)
8149 tree itype = NULL_TREE;
8151 /* If things have already gone awry, bail now. */
8152 if (type == error_mark_node || size == error_mark_node)
8153 return error_mark_node;
8155 /* 8.3.4/1: If the type of the identifier of D contains the auto
8156 type-specifier, the program is ill-formed. */
8157 if (pedantic && type_uses_auto (type))
8158 pedwarn (input_location, OPT_pedantic,
8159 "declaration of %qD as array of %<auto%>", name);
8161 /* If there are some types which cannot be array elements,
8162 issue an error-message and return. */
8163 switch (TREE_CODE (type))
8167 error ("declaration of %qD as array of void", name);
8169 error ("creating array of void");
8170 return error_mark_node;
8174 error ("declaration of %qD as array of functions", name);
8176 error ("creating array of functions");
8177 return error_mark_node;
8179 case REFERENCE_TYPE:
8181 error ("declaration of %qD as array of references", name);
8183 error ("creating array of references");
8184 return error_mark_node;
8188 error ("declaration of %qD as array of function members", name);
8190 error ("creating array of function members");
8191 return error_mark_node;
8199 The constant expressions that specify the bounds of the arrays
8200 can be omitted only for the first member of the sequence. */
8201 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8204 error ("declaration of %qD as multidimensional array must "
8205 "have bounds for all dimensions except the first",
8208 error ("multidimensional array must have bounds for all "
8209 "dimensions except the first");
8211 return error_mark_node;
8214 /* Figure out the index type for the array. */
8216 itype = compute_array_index_type (name, size, tf_warning_or_error);
8219 T is called the array element type; this type shall not be [...] an
8220 abstract class type. */
8221 abstract_virtuals_error (name, type);
8223 return build_cplus_array_type (type, itype);
8226 /* Check that it's OK to declare a function with the indicated TYPE.
8227 SFK indicates the kind of special function (if any) that this
8228 function is. OPTYPE is the type given in a conversion operator
8229 declaration, or the class type for a constructor/destructor.
8230 Returns the actual return type of the function; that
8231 may be different than TYPE if an error occurs, or for certain
8232 special functions. */
8235 check_special_function_return_type (special_function_kind sfk,
8241 case sfk_constructor:
8243 error ("return type specification for constructor invalid");
8245 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8246 type = build_pointer_type (optype);
8248 type = void_type_node;
8251 case sfk_destructor:
8253 error ("return type specification for destructor invalid");
8254 /* We can't use the proper return type here because we run into
8255 problems with ambiguous bases and covariant returns.
8256 Java classes are left unchanged because (void *) isn't a valid
8257 Java type, and we don't want to change the Java ABI. */
8258 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8259 type = build_pointer_type (void_type_node);
8261 type = void_type_node;
8264 case sfk_conversion:
8266 error ("return type specified for %<operator %T%>", optype);
8277 /* A variable or data member (whose unqualified name is IDENTIFIER)
8278 has been declared with the indicated TYPE. If the TYPE is not
8279 acceptable, issue an error message and return a type to use for
8280 error-recovery purposes. */
8283 check_var_type (tree identifier, tree type)
8285 if (VOID_TYPE_P (type))
8288 error ("unnamed variable or field declared void");
8289 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8291 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8292 error ("variable or field %qE declared void", identifier);
8295 error ("variable or field declared void");
8296 type = error_mark_node;
8302 /* Given declspecs and a declarator (abstract or otherwise), determine
8303 the name and type of the object declared and construct a DECL node
8306 DECLSPECS points to the representation of declaration-specifier
8307 sequence that precedes declarator.
8309 DECL_CONTEXT says which syntactic context this declaration is in:
8310 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8311 FUNCDEF for a function definition. Like NORMAL but a few different
8312 error messages in each case. Return value may be zero meaning
8313 this definition is too screwy to try to parse.
8314 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8315 handle member functions (which have FIELD context).
8316 Return value may be zero meaning this definition is too screwy to
8318 PARM for a parameter declaration (either within a function prototype
8319 or before a function body). Make a PARM_DECL, or return void_type_node.
8320 TPARM for a template parameter declaration.
8321 CATCHPARM for a parameter declaration before a catch clause.
8322 TYPENAME if for a typename (in a cast or sizeof).
8323 Don't make a DECL node; just return the ..._TYPE node.
8324 FIELD for a struct or union field; make a FIELD_DECL.
8325 BITFIELD for a field with specified width.
8327 INITIALIZED is as for start_decl.
8329 ATTRLIST is a pointer to the list of attributes, which may be NULL
8330 if there are none; *ATTRLIST may be modified if attributes from inside
8331 the declarator should be applied to the declaration.
8333 When this function is called, scoping variables (such as
8334 CURRENT_CLASS_TYPE) should reflect the scope in which the
8335 declaration occurs, not the scope in which the new declaration will
8336 be placed. For example, on:
8340 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8343 Returns a DECL (if a declarator is present), a TYPE (if there is no
8344 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8348 grokdeclarator (const cp_declarator *declarator,
8349 const cp_decl_specifier_seq *declspecs,
8350 enum decl_context decl_context,
8354 tree type = NULL_TREE;
8356 int explicit_int128 = 0;
8357 int virtualp, explicitp, friendp, inlinep, staticp;
8358 int explicit_int = 0;
8359 int explicit_char = 0;
8360 int defaulted_int = 0;
8361 tree dependent_name = NULL_TREE;
8363 tree typedef_decl = NULL_TREE;
8364 const char *name = NULL;
8365 tree typedef_type = NULL_TREE;
8366 /* True if this declarator is a function definition. */
8367 bool funcdef_flag = false;
8368 cp_declarator_kind innermost_code = cdk_error;
8371 /* See the code below that used this. */
8372 tree decl_attr = NULL_TREE;
8375 /* Keep track of what sort of function is being processed
8376 so that we can warn about default return values, or explicit
8377 return values which do not match prescribed defaults. */
8378 special_function_kind sfk = sfk_none;
8380 tree dname = NULL_TREE;
8381 tree ctor_return_type = NULL_TREE;
8382 enum overload_flags flags = NO_SPECIAL;
8383 /* cv-qualifiers that apply to the declarator, for a declaration of
8384 a member function. */
8385 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8386 /* virt-specifiers that apply to the declarator, for a declaration of
8387 a member function. */
8388 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8389 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8391 tree raises = NULL_TREE;
8392 int template_count = 0;
8393 tree returned_attrs = NULL_TREE;
8394 tree parms = NULL_TREE;
8395 const cp_declarator *id_declarator;
8396 /* The unqualified name of the declarator; either an
8397 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8398 tree unqualified_id;
8399 /* The class type, if any, in which this entity is located,
8400 or NULL_TREE if none. Note that this value may be different from
8401 the current class type; for example if an attempt is made to declare
8402 "A::f" inside "B", this value will be "A". */
8403 tree ctype = current_class_type;
8404 /* The NAMESPACE_DECL for the namespace in which this entity is
8405 located. If an unqualified name is used to declare the entity,
8406 this value will be NULL_TREE, even if the entity is located at
8408 tree in_namespace = NULL_TREE;
8409 cp_storage_class storage_class;
8410 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8411 bool type_was_error_mark_node = false;
8412 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8413 bool template_type_arg = false;
8414 bool template_parm_flag = false;
8415 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8418 signed_p = declspecs->specs[(int)ds_signed];
8419 unsigned_p = declspecs->specs[(int)ds_unsigned];
8420 short_p = declspecs->specs[(int)ds_short];
8421 long_p = declspecs->specs[(int)ds_long];
8422 longlong = declspecs->specs[(int)ds_long] >= 2;
8423 explicit_int128 = declspecs->explicit_int128_p;
8424 thread_p = declspecs->specs[(int)ds_thread];
8426 if (decl_context == FUNCDEF)
8427 funcdef_flag = true, decl_context = NORMAL;
8428 else if (decl_context == MEMFUNCDEF)
8429 funcdef_flag = true, decl_context = FIELD;
8430 else if (decl_context == BITFIELD)
8431 bitfield = 1, decl_context = FIELD;
8432 else if (decl_context == TEMPLATE_TYPE_ARG)
8433 template_type_arg = true, decl_context = TYPENAME;
8434 else if (decl_context == TPARM)
8435 template_parm_flag = true, decl_context = PARM;
8437 if (initialized > 1)
8438 funcdef_flag = true;
8440 /* Look inside a declarator for the name being declared
8441 and get it as a string, for an error message. */
8442 for (id_declarator = declarator;
8444 id_declarator = id_declarator->declarator)
8446 if (id_declarator->kind != cdk_id)
8447 innermost_code = id_declarator->kind;
8449 switch (id_declarator->kind)
8452 if (id_declarator->declarator
8453 && id_declarator->declarator->kind == cdk_id)
8455 sfk = id_declarator->declarator->u.id.sfk;
8456 if (sfk == sfk_destructor)
8463 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8464 tree decl = id_declarator->u.id.unqualified_name;
8467 if (qualifying_scope)
8469 if (at_function_scope_p ())
8473 A declarator-id shall not be qualified except
8476 None of the cases are permitted in block
8478 if (qualifying_scope == global_namespace)
8479 error ("invalid use of qualified-name %<::%D%>",
8481 else if (TYPE_P (qualifying_scope))
8482 error ("invalid use of qualified-name %<%T::%D%>",
8483 qualifying_scope, decl);
8485 error ("invalid use of qualified-name %<%D::%D%>",
8486 qualifying_scope, decl);
8487 return error_mark_node;
8489 else if (TYPE_P (qualifying_scope))
8491 ctype = qualifying_scope;
8492 if (!MAYBE_CLASS_TYPE_P (ctype))
8494 error ("%q#T is not a class or a namespace", ctype);
8497 else if (innermost_code != cdk_function
8498 && current_class_type
8499 && !UNIQUELY_DERIVED_FROM_P (ctype,
8500 current_class_type))
8502 error ("type %qT is not derived from type %qT",
8503 ctype, current_class_type);
8504 return error_mark_node;
8507 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8508 in_namespace = qualifying_scope;
8510 switch (TREE_CODE (decl))
8516 if (innermost_code != cdk_function)
8518 error ("declaration of %qD as non-function", decl);
8519 return error_mark_node;
8521 else if (!qualifying_scope
8522 && !(current_class_type && at_class_scope_p ()))
8524 error ("declaration of %qD as non-member", decl);
8525 return error_mark_node;
8528 type = TREE_OPERAND (decl, 0);
8530 type = constructor_name (type);
8531 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8536 case TEMPLATE_ID_EXPR:
8538 tree fns = TREE_OPERAND (decl, 0);
8541 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8543 gcc_assert (is_overloaded_fn (dname));
8544 dname = DECL_NAME (get_first_fn (dname));
8549 case IDENTIFIER_NODE:
8550 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8553 if (C_IS_RESERVED_WORD (dname))
8555 error ("declarator-id missing; using reserved word %qD",
8557 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8559 else if (!IDENTIFIER_TYPENAME_P (dname))
8560 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8563 gcc_assert (flags == NO_SPECIAL);
8564 flags = TYPENAME_FLAG;
8565 ctor_return_type = TREE_TYPE (dname);
8566 sfk = sfk_conversion;
8567 if (is_typename_at_global_scope (dname))
8568 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8570 name = "<invalid operator>";
8587 return error_mark_node;
8592 if (id_declarator->kind == cdk_id)
8598 The declarator in a function-definition shall have the form
8599 D1 ( parameter-declaration-clause) ... */
8600 if (funcdef_flag && innermost_code != cdk_function)
8602 error ("function definition does not declare parameters");
8603 return error_mark_node;
8606 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8607 && innermost_code != cdk_function
8608 && ! (ctype && !declspecs->any_specifiers_p))
8610 error ("declaration of %qD as non-function", dname);
8611 return error_mark_node;
8615 && TREE_CODE (dname) == IDENTIFIER_NODE
8616 && UDLIT_OPER_P (dname)
8617 && innermost_code != cdk_function)
8619 error ("declaration of %qD as non-function", dname);
8620 return error_mark_node;
8623 if (dname && IDENTIFIER_OPNAME_P (dname))
8625 if (declspecs->specs[(int)ds_typedef])
8627 error ("declaration of %qD as %<typedef%>", dname);
8628 return error_mark_node;
8630 else if (decl_context == PARM || decl_context == CATCHPARM)
8632 error ("declaration of %qD as parameter", dname);
8633 return error_mark_node;
8637 /* Anything declared one level down from the top level
8638 must be one of the parameters of a function
8639 (because the body is at least two levels down). */
8641 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8642 by not allowing C++ class definitions to specify their parameters
8643 with xdecls (must be spec.d in the parmlist).
8645 Since we now wait to push a class scope until we are sure that
8646 we are in a legitimate method context, we must set oldcname
8647 explicitly (since current_class_name is not yet alive).
8649 We also want to avoid calling this a PARM if it is in a namespace. */
8651 if (decl_context == NORMAL && !toplevel_bindings_p ())
8653 cp_binding_level *b = current_binding_level;
8654 current_binding_level = b->level_chain;
8655 if (current_binding_level != 0 && toplevel_bindings_p ())
8656 decl_context = PARM;
8657 current_binding_level = b;
8661 name = decl_context == PARM ? "parameter" : "type name";
8663 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8665 error ("%<constexpr%> cannot appear in a typedef declaration");
8666 return error_mark_node;
8669 /* If there were multiple types specified in the decl-specifier-seq,
8670 issue an error message. */
8671 if (declspecs->multiple_types_p)
8673 error ("two or more data types in declaration of %qs", name);
8674 return error_mark_node;
8677 if (declspecs->conflicting_specifiers_p)
8679 error ("conflicting specifiers in declaration of %qs", name);
8680 return error_mark_node;
8683 /* Extract the basic type from the decl-specifier-seq. */
8684 type = declspecs->type;
8685 if (type == error_mark_node)
8688 type_was_error_mark_node = true;
8690 /* If the entire declaration is itself tagged as deprecated then
8691 suppress reports of deprecated items. */
8692 if (type && TREE_DEPRECATED (type)
8693 && deprecated_state != DEPRECATED_SUPPRESS)
8694 warn_deprecated_use (type, NULL_TREE);
8695 if (type && TREE_CODE (type) == TYPE_DECL)
8697 typedef_decl = type;
8698 type = TREE_TYPE (typedef_decl);
8699 if (TREE_DEPRECATED (type)
8700 && DECL_ARTIFICIAL (typedef_decl)
8701 && deprecated_state != DEPRECATED_SUPPRESS)
8702 warn_deprecated_use (type, NULL_TREE);
8704 /* No type at all: default to `int', and set DEFAULTED_INT
8705 because it was not a user-defined typedef. */
8706 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8708 /* These imply 'int'. */
8709 type = integer_type_node;
8713 explicit_int = declspecs->explicit_int_p;
8714 explicit_char = declspecs->explicit_char_p;
8717 /* See the code below that used this. */
8719 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8721 typedef_type = type;
8724 if (sfk != sfk_conversion)
8725 ctor_return_type = ctype;
8727 if (sfk != sfk_none)
8728 type = check_special_function_return_type (sfk, type,
8730 else if (type == NULL_TREE)
8736 /* We handle `main' specially here, because 'main () { }' is so
8737 common. With no options, it is allowed. With -Wreturn-type,
8738 it is a warning. It is only an error with -pedantic-errors. */
8739 is_main = (funcdef_flag
8740 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8741 && MAIN_NAME_P (dname)
8742 && ctype == NULL_TREE
8743 && in_namespace == NULL_TREE
8744 && current_namespace == global_namespace);
8746 if (type_was_error_mark_node)
8747 /* We've already issued an error, don't complain more. */;
8748 else if (in_system_header || flag_ms_extensions)
8749 /* Allow it, sigh. */;
8751 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8753 pedwarn (input_location, OPT_pedantic,
8754 "ISO C++ forbids declaration of %qs with no type", name);
8756 warning (OPT_Wreturn_type,
8757 "ISO C++ forbids declaration of %qs with no type", name);
8759 type = integer_type_node;
8764 if (explicit_int128)
8766 if (int128_integer_type_node == NULL_TREE)
8768 error ("%<__int128%> is not supported by this target");
8769 explicit_int128 = false;
8771 else if (pedantic && ! in_system_header)
8772 pedwarn (input_location, OPT_pedantic,
8773 "ISO C++ does not support %<__int128%> for %qs", name);
8776 /* Now process the modifiers that were specified
8777 and check for invalid combinations. */
8779 /* Long double is a special combination. */
8780 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8783 type = cp_build_qualified_type (long_double_type_node,
8784 cp_type_quals (type));
8787 /* Check all other uses of type modifiers. */
8789 if (unsigned_p || signed_p || long_p || short_p)
8793 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8794 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8795 else if (signed_p && unsigned_p)
8796 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8797 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8798 error ("%<long long%> invalid for %qs", name);
8799 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8800 error ("%<long%> invalid for %qs", name);
8801 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8802 error ("%<short%> invalid for %qs", name);
8803 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8804 error ("%<long%> or %<short%> invalid for %qs", name);
8805 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8806 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8807 else if ((long_p || short_p) && explicit_char)
8808 error ("%<long%> or %<short%> specified with char for %qs", name);
8809 else if (long_p && short_p)
8810 error ("%<long%> and %<short%> specified together for %qs", name);
8811 else if (type == char16_type_node || type == char32_type_node)
8813 if (signed_p || unsigned_p)
8814 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8815 else if (short_p || long_p)
8816 error ("%<short%> or %<long%> invalid for %qs", name);
8821 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8823 pedwarn (input_location, OPT_pedantic,
8824 "long, short, signed or unsigned used invalidly for %qs",
8826 if (flag_pedantic_errors)
8831 /* Discard the type modifiers if they are invalid. */
8842 /* Decide whether an integer type is signed or not.
8843 Optionally treat bitfields as signed by default. */
8847 It is implementation-defined whether a plain (neither
8848 explicitly signed or unsigned) char, short, int, or long
8849 bit-field is signed or unsigned.
8851 Naturally, we extend this to long long as well. Note that
8852 this does not include wchar_t. */
8853 || (bitfield && !flag_signed_bitfields
8855 /* A typedef for plain `int' without `signed' can be
8856 controlled just like plain `int', but a typedef for
8857 `signed int' cannot be so controlled. */
8859 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8860 && TREE_CODE (type) == INTEGER_TYPE
8861 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8863 if (explicit_int128)
8864 type = int128_unsigned_type_node;
8866 type = long_long_unsigned_type_node;
8868 type = long_unsigned_type_node;
8870 type = short_unsigned_type_node;
8871 else if (type == char_type_node)
8872 type = unsigned_char_type_node;
8873 else if (typedef_decl)
8874 type = unsigned_type_for (type);
8876 type = unsigned_type_node;
8878 else if (signed_p && type == char_type_node)
8879 type = signed_char_type_node;
8880 else if (explicit_int128)
8881 type = int128_integer_type_node;
8883 type = long_long_integer_type_node;
8885 type = long_integer_type_node;
8887 type = short_integer_type_node;
8889 if (declspecs->specs[(int)ds_complex])
8891 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8892 error ("complex invalid for %qs", name);
8893 /* If we just have "complex", it is equivalent to
8894 "complex double", but if any modifiers at all are specified it is
8895 the complex form of TYPE. E.g, "complex short" is
8896 "complex short int". */
8897 else if (defaulted_int && ! longlong && ! explicit_int128
8898 && ! (long_p || short_p || signed_p || unsigned_p))
8899 type = complex_double_type_node;
8900 else if (type == integer_type_node)
8901 type = complex_integer_type_node;
8902 else if (type == float_type_node)
8903 type = complex_float_type_node;
8904 else if (type == double_type_node)
8905 type = complex_double_type_node;
8906 else if (type == long_double_type_node)
8907 type = complex_long_double_type_node;
8909 type = build_complex_type (type);
8912 type_quals = TYPE_UNQUALIFIED;
8913 if (declspecs->specs[(int)ds_const])
8914 type_quals |= TYPE_QUAL_CONST;
8915 if (declspecs->specs[(int)ds_volatile])
8916 type_quals |= TYPE_QUAL_VOLATILE;
8917 if (declspecs->specs[(int)ds_restrict])
8918 type_quals |= TYPE_QUAL_RESTRICT;
8919 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8920 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8923 type_quals |= cp_type_quals (type);
8924 type = cp_build_qualified_type_real
8925 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8926 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8927 /* We might have ignored or rejected some of the qualifiers. */
8928 type_quals = cp_type_quals (type);
8931 inlinep = !! declspecs->specs[(int)ds_inline];
8932 virtualp = !! declspecs->specs[(int)ds_virtual];
8933 explicitp = !! declspecs->specs[(int)ds_explicit];
8935 storage_class = declspecs->storage_class;
8936 if (storage_class == sc_static)
8937 staticp = 1 + (decl_context == FIELD);
8939 if (virtualp && staticp == 2)
8941 error ("member %qD cannot be declared both virtual and static", dname);
8942 storage_class = sc_none;
8945 friendp = !! declspecs->specs[(int)ds_friend];
8947 if (dependent_name && !friendp)
8949 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8950 return error_mark_node;
8953 /* Issue errors about use of storage classes for parameters. */
8954 if (decl_context == PARM)
8956 if (declspecs->specs[(int)ds_typedef])
8958 error ("typedef declaration invalid in parameter declaration");
8959 return error_mark_node;
8961 else if (template_parm_flag && storage_class != sc_none)
8963 error ("storage class specified for template parameter %qs", name);
8964 return error_mark_node;
8966 else if (storage_class == sc_static
8967 || storage_class == sc_extern
8969 error ("storage class specifiers invalid in parameter declarations");
8971 /* Function parameters cannot be constexpr. If we saw one, moan
8972 and pretend it wasn't there. */
8975 error ("a parameter cannot be declared %<constexpr%>");
8980 /* Give error if `virtual' is used outside of class declaration. */
8982 && (current_class_name == NULL_TREE || decl_context != FIELD))
8984 error ("%<virtual%> outside class declaration");
8988 /* Static anonymous unions are dealt with here. */
8989 if (staticp && decl_context == TYPENAME
8991 && ANON_AGGR_TYPE_P (declspecs->type))
8992 decl_context = FIELD;
8994 /* Warn about storage classes that are invalid for certain
8995 kinds of declarations (parameters, typenames, etc.). */
8998 && storage_class != sc_extern
8999 && storage_class != sc_static)
9000 || declspecs->specs[(int)ds_typedef]))
9002 error ("multiple storage classes in declaration of %qs", name);
9005 if (decl_context != NORMAL
9006 && ((storage_class != sc_none
9007 && storage_class != sc_mutable)
9010 if ((decl_context == PARM || decl_context == CATCHPARM)
9011 && (storage_class == sc_register
9012 || storage_class == sc_auto))
9014 else if (declspecs->specs[(int)ds_typedef])
9016 else if (decl_context == FIELD
9017 /* C++ allows static class elements. */
9018 && storage_class == sc_static)
9019 /* C++ also allows inlines and signed and unsigned elements,
9020 but in those cases we don't come in here. */
9024 if (decl_context == FIELD)
9025 error ("storage class specified for %qs", name);
9028 if (decl_context == PARM || decl_context == CATCHPARM)
9029 error ("storage class specified for parameter %qs", name);
9031 error ("storage class specified for typename");
9033 if (storage_class == sc_register
9034 || storage_class == sc_auto
9035 || storage_class == sc_extern
9037 storage_class = sc_none;
9040 else if (storage_class == sc_extern && funcdef_flag
9041 && ! toplevel_bindings_p ())
9042 error ("nested function %qs declared %<extern%>", name);
9043 else if (toplevel_bindings_p ())
9045 if (storage_class == sc_auto)
9046 error ("top-level declaration of %qs specifies %<auto%>", name);
9049 && storage_class != sc_extern
9050 && storage_class != sc_static)
9052 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9057 if (storage_class && friendp)
9059 error ("storage class specifiers invalid in friend function declarations");
9060 storage_class = sc_none;
9065 unqualified_id = NULL_TREE;
9068 unqualified_id = id_declarator->u.id.unqualified_name;
9069 switch (TREE_CODE (unqualified_id))
9072 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9073 if (TYPE_P (unqualified_id))
9074 unqualified_id = constructor_name (unqualified_id);
9077 case IDENTIFIER_NODE:
9078 case TEMPLATE_ID_EXPR:
9086 /* Determine the type of the entity declared by recurring on the
9088 for (; declarator; declarator = declarator->declarator)
9090 const cp_declarator *inner_declarator;
9093 if (type == error_mark_node)
9094 return error_mark_node;
9096 attrs = declarator->attributes;
9102 if (declarator == NULL || declarator->kind == cdk_id)
9103 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9104 if (declarator->kind == cdk_function)
9105 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9106 if (declarator->kind == cdk_array)
9107 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9108 returned_attrs = decl_attributes (&type,
9109 chainon (returned_attrs, attrs),
9113 if (declarator->kind == cdk_id)
9116 inner_declarator = declarator->declarator;
9118 switch (declarator->kind)
9121 type = create_array_type_for_decl (dname, type,
9122 declarator->u.array.bounds);
9130 /* Declaring a function type.
9131 Make sure we have a valid type for the function to return. */
9133 if (type_quals != TYPE_UNQUALIFIED)
9135 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9136 warning (OPT_Wignored_qualifiers,
9137 "type qualifiers ignored on function return type");
9138 /* We now know that the TYPE_QUALS don't apply to the
9139 decl, but to its return type. */
9140 type_quals = TYPE_UNQUALIFIED;
9142 errmsg = targetm.invalid_return_type (type);
9146 type = integer_type_node;
9149 /* Error about some types functions can't return. */
9151 if (TREE_CODE (type) == FUNCTION_TYPE)
9153 error ("%qs declared as function returning a function", name);
9154 return error_mark_node;
9156 if (TREE_CODE (type) == ARRAY_TYPE)
9158 error ("%qs declared as function returning an array", name);
9159 return error_mark_node;
9162 /* Pick up type qualifiers which should be applied to `this'. */
9163 memfn_quals = declarator->u.function.qualifiers;
9164 /* Pick up virt-specifiers. */
9165 virt_specifiers = declarator->u.function.virt_specifiers;
9166 /* Pick up the exception specifications. */
9167 raises = declarator->u.function.exception_specification;
9168 /* If the exception-specification is ill-formed, let's pretend
9169 there wasn't one. */
9170 if (raises == error_mark_node)
9173 /* Say it's a definition only for the CALL_EXPR
9174 closest to the identifier. */
9175 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9177 /* Handle a late-specified return type. */
9180 if (type_uses_auto (type))
9182 if (!declarator->u.function.late_return_type)
9184 error ("%qs function uses %<auto%> type specifier without"
9185 " trailing return type", name);
9186 return error_mark_node;
9188 else if (!is_auto (type))
9190 error ("%qs function with trailing return type has"
9191 " %qT as its type rather than plain %<auto%>",
9193 return error_mark_node;
9196 else if (declarator->u.function.late_return_type)
9198 if (cxx_dialect < cxx0x)
9199 /* Not using maybe_warn_cpp0x because this should
9200 always be an error. */
9201 error ("trailing return type only available with "
9202 "-std=c++11 or -std=gnu++11");
9204 error ("%qs function with trailing return type not "
9205 "declared with %<auto%> type specifier", name);
9206 return error_mark_node;
9209 type = splice_late_return_type
9210 (type, declarator->u.function.late_return_type);
9211 if (type == error_mark_node)
9212 return error_mark_node;
9214 if (ctype == NULL_TREE
9215 && decl_context == FIELD
9217 && (friendp == 0 || dname == current_class_name))
9218 ctype = current_class_type;
9220 if (ctype && (sfk == sfk_constructor
9221 || sfk == sfk_destructor))
9223 /* We are within a class's scope. If our declarator name
9224 is the same as the class name, and we are defining
9225 a function, then it is a constructor/destructor, and
9226 therefore returns a void type. */
9228 /* ISO C++ 12.4/2. A destructor may not be declared
9229 const or volatile. A destructor may not be
9232 ISO C++ 12.1. A constructor may not be declared
9233 const or volatile. A constructor may not be
9234 virtual. A constructor may not be static. */
9236 error ((flags == DTOR_FLAG)
9237 ? G_("destructor cannot be static member function")
9238 : G_("constructor cannot be static member function"));
9241 error ((flags == DTOR_FLAG)
9242 ? G_("destructors may not be cv-qualified")
9243 : G_("constructors may not be cv-qualified"));
9244 memfn_quals = TYPE_UNQUALIFIED;
9247 if (decl_context == FIELD
9248 && !member_function_or_else (ctype,
9251 return error_mark_node;
9253 if (flags != DTOR_FLAG)
9255 /* It's a constructor. */
9260 permerror (input_location, "constructors cannot be declared virtual");
9263 if (decl_context == FIELD
9264 && sfk != sfk_constructor)
9265 return error_mark_node;
9267 if (decl_context == FIELD)
9273 error ("can%'t initialize friend function %qs", name);
9276 /* Cannot be both friend and virtual. */
9277 error ("virtual functions cannot be friends");
9280 if (decl_context == NORMAL)
9281 error ("friend declaration not in class definition");
9282 if (current_function_decl && funcdef_flag)
9283 error ("can%'t define friend function %qs in a local "
9287 else if (ctype && sfk == sfk_conversion)
9291 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9296 arg_types = grokparms (declarator->u.function.parameters,
9299 if (inner_declarator
9300 && inner_declarator->kind == cdk_id
9301 && inner_declarator->u.id.sfk == sfk_destructor
9302 && arg_types != void_list_node)
9304 error ("destructors may not have parameters");
9305 arg_types = void_list_node;
9309 type = build_function_type (type, arg_types);
9316 /* Filter out pointers-to-references and references-to-references.
9317 We can get these if a TYPE_DECL is used. */
9319 if (TREE_CODE (type) == REFERENCE_TYPE)
9321 if (declarator->kind != cdk_reference)
9323 error ("cannot declare pointer to %q#T", type);
9324 type = TREE_TYPE (type);
9327 /* In C++0x, we allow reference to reference declarations
9328 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9329 and template type arguments [14.3.1/4 temp.arg.type]. The
9330 check for direct reference to reference declarations, which
9331 are still forbidden, occurs below. Reasoning behind the change
9332 can be found in DR106, DR540, and the rvalue reference
9334 else if (cxx_dialect == cxx98)
9336 error ("cannot declare reference to %q#T", type);
9337 type = TREE_TYPE (type);
9340 else if (VOID_TYPE_P (type))
9342 if (declarator->kind == cdk_reference)
9343 error ("cannot declare reference to %q#T", type);
9344 else if (declarator->kind == cdk_ptrmem)
9345 error ("cannot declare pointer to %q#T member", type);
9348 /* We now know that the TYPE_QUALS don't apply to the decl,
9349 but to the target of the pointer. */
9350 type_quals = TYPE_UNQUALIFIED;
9352 if (declarator->kind == cdk_ptrmem
9353 && (TREE_CODE (type) == FUNCTION_TYPE
9354 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9356 memfn_quals |= type_memfn_quals (type);
9357 type = build_memfn_type (type,
9358 declarator->u.pointer.class_type,
9360 if (type == error_mark_node)
9361 return error_mark_node;
9362 memfn_quals = TYPE_UNQUALIFIED;
9365 if (TREE_CODE (type) == FUNCTION_TYPE
9366 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9367 error (declarator->kind == cdk_reference
9368 ? G_("cannot declare reference to qualified function type %qT")
9369 : G_("cannot declare pointer to qualified function type %qT"),
9372 /* When the pointed-to type involves components of variable size,
9373 care must be taken to ensure that the size evaluation code is
9374 emitted early enough to dominate all the possible later uses
9375 and late enough for the variables on which it depends to have
9378 This is expected to happen automatically when the pointed-to
9379 type has a name/declaration of it's own, but special attention
9380 is required if the type is anonymous.
9382 We handle the NORMAL and FIELD contexts here by inserting a
9383 dummy statement that just evaluates the size at a safe point
9384 and ensures it is not deferred until e.g. within a deeper
9385 conditional context (c++/43555).
9387 We expect nothing to be needed here for PARM or TYPENAME.
9388 Evaluating the size at this point for TYPENAME would
9389 actually be incorrect, as we might be in the middle of an
9390 expression with side effects on the pointed-to type size
9391 "arguments" prior to the pointer declaration point and the
9392 size evaluation could end up prior to the side effects. */
9394 if (!TYPE_NAME (type)
9395 && (decl_context == NORMAL || decl_context == FIELD)
9396 && at_function_scope_p ()
9397 && variably_modified_type_p (type, NULL_TREE))
9399 /* First break out any side-effects. */
9400 stabilize_vla_size (TYPE_SIZE (type));
9401 /* And then force evaluation of the SAVE_EXPR. */
9402 finish_expr_stmt (TYPE_SIZE (type));
9405 if (declarator->kind == cdk_reference)
9407 /* In C++0x, the type we are creating a reference to might be
9408 a typedef which is itself a reference type. In that case,
9409 we follow the reference collapsing rules in
9410 [7.1.3/8 dcl.typedef] to create the final reference type:
9412 "If a typedef TD names a type that is a reference to a type
9413 T, an attempt to create the type 'lvalue reference to cv TD'
9414 creates the type 'lvalue reference to T,' while an attempt
9415 to create the type "rvalue reference to cv TD' creates the
9418 if (VOID_TYPE_P (type))
9419 /* We already gave an error. */;
9420 else if (TREE_CODE (type) == REFERENCE_TYPE)
9422 if (declarator->u.reference.rvalue_ref)
9423 /* Leave type alone. */;
9425 type = cp_build_reference_type (TREE_TYPE (type), false);
9428 type = cp_build_reference_type
9429 (type, declarator->u.reference.rvalue_ref);
9431 /* In C++0x, we need this check for direct reference to
9432 reference declarations, which are forbidden by
9433 [8.3.2/5 dcl.ref]. Reference to reference declarations
9434 are only allowed indirectly through typedefs and template
9435 type arguments. Example:
9437 void foo(int & &); // invalid ref-to-ref decl
9439 typedef int & int_ref;
9440 void foo(int_ref &); // valid ref-to-ref decl
9442 if (inner_declarator && inner_declarator->kind == cdk_reference)
9443 error ("cannot declare reference to %q#T, which is not "
9444 "a typedef or a template type argument", type);
9446 else if (TREE_CODE (type) == METHOD_TYPE)
9447 type = build_ptrmemfunc_type (build_pointer_type (type));
9448 else if (declarator->kind == cdk_ptrmem)
9450 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9452 if (declarator->u.pointer.class_type == error_mark_node)
9453 /* We will already have complained. */
9454 type = error_mark_node;
9456 type = build_ptrmem_type (declarator->u.pointer.class_type,
9460 type = build_pointer_type (type);
9462 /* Process a list of type modifier keywords (such as
9463 const or volatile) that were given inside the `*' or `&'. */
9465 if (declarator->u.pointer.qualifiers)
9468 = cp_build_qualified_type (type,
9469 declarator->u.pointer.qualifiers);
9470 type_quals = cp_type_quals (type);
9483 /* We need to stabilize side-effects in VLA sizes for regular array
9484 declarations too, not just pointers to arrays. */
9485 if (type != error_mark_node && !TYPE_NAME (type)
9486 && (decl_context == NORMAL || decl_context == FIELD)
9487 && at_function_scope_p ()
9488 && variably_modified_type_p (type, NULL_TREE))
9489 stabilize_vla_size (TYPE_SIZE (type));
9491 /* A `constexpr' specifier used in an object declaration declares
9492 the object as `const'. */
9493 if (constexpr_p && innermost_code != cdk_function)
9495 if (type_quals & TYPE_QUAL_CONST)
9496 error ("both %<const%> and %<constexpr%> cannot be used here");
9497 if (type_quals & TYPE_QUAL_VOLATILE)
9498 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9499 if (TREE_CODE (type) != REFERENCE_TYPE)
9501 type_quals |= TYPE_QUAL_CONST;
9502 type = cp_build_qualified_type (type, type_quals);
9506 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9507 && TREE_CODE (type) != FUNCTION_TYPE
9508 && TREE_CODE (type) != METHOD_TYPE)
9510 error ("template-id %qD used as a declarator",
9512 unqualified_id = dname;
9515 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9516 qualified with a class-name, turn it into a METHOD_TYPE, unless
9517 we know that the function is static. We take advantage of this
9518 opportunity to do other processing that pertains to entities
9519 explicitly declared to be class members. Note that if DECLARATOR
9520 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9521 would not have exited the loop above. */
9523 && declarator->u.id.qualifying_scope
9524 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9528 ctype = declarator->u.id.qualifying_scope;
9529 ctype = TYPE_MAIN_VARIANT (ctype);
9531 while (t != NULL_TREE && CLASS_TYPE_P (t))
9533 /* You're supposed to have one `template <...>' for every
9534 template class, but you don't need one for a full
9535 specialization. For example:
9537 template <class T> struct S{};
9538 template <> struct S<int> { void f(); };
9539 void S<int>::f () {}
9541 is correct; there shouldn't be a `template <>' for the
9542 definition of `S<int>::f'. */
9543 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9544 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9545 /* T is an explicit (not partial) specialization. All
9546 containing classes must therefore also be explicitly
9549 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9550 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9551 template_count += 1;
9553 t = TYPE_MAIN_DECL (t);
9554 t = DECL_CONTEXT (t);
9557 if (ctype == current_class_type)
9561 permerror (input_location, "member functions are implicitly friends of their class");
9565 permerror (declarator->id_loc,
9566 "extra qualification %<%T::%> on member %qs",
9569 else if (/* If the qualifying type is already complete, then we
9570 can skip the following checks. */
9571 !COMPLETE_TYPE_P (ctype)
9572 && (/* If the function is being defined, then
9573 qualifying type must certainly be complete. */
9575 /* A friend declaration of "T::f" is OK, even if
9576 "T" is a template parameter. But, if this
9577 function is not a friend, the qualifying type
9579 || (!friendp && !CLASS_TYPE_P (ctype))
9580 /* For a declaration, the type need not be
9581 complete, if either it is dependent (since there
9582 is no meaningful definition of complete in that
9583 case) or the qualifying class is currently being
9585 || !(dependent_type_p (ctype)
9586 || currently_open_class (ctype)))
9587 /* Check that the qualifying type is complete. */
9588 && !complete_type_or_else (ctype, NULL_TREE))
9589 return error_mark_node;
9590 else if (TREE_CODE (type) == FUNCTION_TYPE)
9592 if (current_class_type
9593 && (!friendp || funcdef_flag))
9596 ? G_("cannot define member function %<%T::%s%> "
9598 : G_("cannot declare member function %<%T::%s%> "
9600 ctype, name, current_class_type);
9601 return error_mark_node;
9604 else if (declspecs->specs[(int)ds_typedef]
9605 && current_class_type)
9607 error ("cannot declare member %<%T::%s%> within %qT",
9608 ctype, name, current_class_type);
9609 return error_mark_node;
9613 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9614 ctype = current_class_type;
9616 /* Now TYPE has the actual type. */
9621 *attrlist = chainon (returned_attrs, *attrlist);
9623 attrlist = &returned_attrs;
9626 /* Handle parameter packs. */
9627 if (parameter_pack_p)
9629 if (decl_context == PARM)
9630 /* Turn the type into a pack expansion.*/
9631 type = make_pack_expansion (type);
9633 error ("non-parameter %qs cannot be a parameter pack", name);
9636 /* Did array size calculations overflow? */
9638 if (TREE_CODE (type) == ARRAY_TYPE
9639 && COMPLETE_TYPE_P (type)
9640 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9641 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9643 error ("size of array %qs is too large", name);
9644 /* If we proceed with the array type as it is, we'll eventually
9645 crash in tree_low_cst(). */
9646 type = error_mark_node;
9649 if ((decl_context == FIELD || decl_context == PARM)
9650 && !processing_template_decl
9651 && variably_modified_type_p (type, NULL_TREE))
9653 if (decl_context == FIELD)
9654 error ("data member may not have variably modified type %qT", type);
9656 error ("parameter may not have variably modified type %qT", type);
9657 type = error_mark_node;
9660 if (explicitp == 1 || (explicitp && friendp))
9662 /* [dcl.fct.spec] The explicit specifier shall only be used in
9663 declarations of constructors within a class definition. */
9664 error ("only declarations of constructors can be %<explicit%>");
9668 if (storage_class == sc_mutable)
9670 if (decl_context != FIELD || friendp)
9672 error ("non-member %qs cannot be declared %<mutable%>", name);
9673 storage_class = sc_none;
9675 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9677 error ("non-object member %qs cannot be declared %<mutable%>", name);
9678 storage_class = sc_none;
9680 else if (TREE_CODE (type) == FUNCTION_TYPE
9681 || TREE_CODE (type) == METHOD_TYPE)
9683 error ("function %qs cannot be declared %<mutable%>", name);
9684 storage_class = sc_none;
9688 error ("static %qs cannot be declared %<mutable%>", name);
9689 storage_class = sc_none;
9691 else if (type_quals & TYPE_QUAL_CONST)
9693 error ("const %qs cannot be declared %<mutable%>", name);
9694 storage_class = sc_none;
9696 else if (TREE_CODE (type) == REFERENCE_TYPE)
9698 permerror (input_location, "reference %qs cannot be declared "
9699 "%<mutable%>", name);
9700 storage_class = sc_none;
9704 /* If this is declaring a typedef name, return a TYPE_DECL. */
9705 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9709 /* Note that the grammar rejects storage classes
9710 in typenames, fields or parameters. */
9711 if (current_lang_name == lang_name_java)
9712 TYPE_FOR_JAVA (type) = 1;
9714 /* This declaration:
9716 typedef void f(int) const;
9718 declares a function type which is not a member of any
9719 particular class, but which is cv-qualified; for
9720 example "f S::*" declares a pointer to a const-qualified
9721 member function of S. We record the cv-qualification in the
9723 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9725 type = apply_memfn_quals (type, memfn_quals);
9727 /* We have now dealt with these qualifiers. */
9728 memfn_quals = TYPE_UNQUALIFIED;
9731 if (type_uses_auto (type))
9733 error ("typedef declared %<auto%>");
9734 type = error_mark_node;
9737 if (decl_context == FIELD)
9738 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9740 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9741 if (id_declarator && declarator->u.id.qualifying_scope) {
9742 error_at (DECL_SOURCE_LOCATION (decl),
9743 "typedef name may not be a nested-name-specifier");
9744 TREE_TYPE (decl) = error_mark_node;
9747 if (decl_context != FIELD)
9749 if (!current_function_decl)
9750 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9751 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9752 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9753 (current_function_decl)))
9754 /* The TYPE_DECL is "abstract" because there will be
9755 clones of this constructor/destructor, and there will
9756 be copies of this TYPE_DECL generated in those
9758 DECL_ABSTRACT (decl) = 1;
9760 else if (constructor_name_p (unqualified_id, current_class_type))
9761 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9762 "as enclosing class",
9765 /* If the user declares "typedef struct {...} foo" then the
9766 struct will have an anonymous name. Fill that name in now.
9767 Nothing can refer to it, so nothing needs know about the name
9769 if (type != error_mark_node
9772 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9773 && TYPE_ANONYMOUS_P (type)
9774 && declspecs->type_definition_p
9775 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9779 /* Replace the anonymous name with the real name everywhere. */
9780 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9782 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9783 /* We do not rename the debug info representing the
9784 anonymous tagged type because the standard says in
9785 [dcl.typedef] that the naming applies only for
9786 linkage purposes. */
9787 /*debug_hooks->set_name (t, decl);*/
9788 TYPE_NAME (t) = decl;
9791 if (TYPE_LANG_SPECIFIC (type))
9792 TYPE_WAS_ANONYMOUS (type) = 1;
9794 /* If this is a typedef within a template class, the nested
9795 type is a (non-primary) template. The name for the
9796 template needs updating as well. */
9797 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9798 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9799 = TYPE_IDENTIFIER (type);
9801 /* Adjust linkage now that we aren't anonymous anymore. */
9802 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9803 determine_visibility (TYPE_MAIN_DECL (type));
9805 /* FIXME remangle member functions; member functions of a
9806 type with external linkage have external linkage. */
9810 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9811 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9813 bad_specifiers (decl, BSP_TYPE, virtualp,
9814 memfn_quals != TYPE_UNQUALIFIED,
9815 inlinep, friendp, raises != NULL_TREE);
9817 if (declspecs->specs[(int)ds_alias])
9818 /* Acknowledge that this was written:
9819 `using analias = atype;'. */
9820 TYPE_DECL_ALIAS_P (decl) = 1;
9825 /* Detect the case of an array type of unspecified size
9826 which came, as such, direct from a typedef name.
9827 We must copy the type, so that the array's domain can be
9828 individually set by the object's initializer. */
9830 if (type && typedef_type
9831 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9832 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9833 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9835 /* Detect where we're using a typedef of function type to declare a
9836 function. PARMS will not be set, so we must create it now. */
9838 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9840 tree decls = NULL_TREE;
9843 for (args = TYPE_ARG_TYPES (type);
9844 args && args != void_list_node;
9845 args = TREE_CHAIN (args))
9847 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9849 DECL_CHAIN (decl) = decls;
9853 parms = nreverse (decls);
9855 if (decl_context != TYPENAME)
9857 /* A cv-qualifier-seq shall only be part of the function type
9858 for a non-static member function. [8.3.5/4 dcl.fct] */
9859 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9860 && (current_class_type == NULL_TREE || staticp) )
9863 ? G_("qualified function types cannot be used to "
9864 "declare static member functions")
9865 : G_("qualified function types cannot be used to "
9866 "declare free functions"));
9867 type = TYPE_MAIN_VARIANT (type);
9870 /* The qualifiers on the function type become the qualifiers on
9871 the non-static member function. */
9872 memfn_quals |= type_memfn_quals (type);
9873 type_quals = TYPE_UNQUALIFIED;
9877 /* If this is a type name (such as, in a cast or sizeof),
9878 compute the type and return it now. */
9880 if (decl_context == TYPENAME)
9882 /* Note that the grammar rejects storage classes
9883 in typenames, fields or parameters. */
9884 if (type_quals != TYPE_UNQUALIFIED)
9885 type_quals = TYPE_UNQUALIFIED;
9887 /* Special case: "friend class foo" looks like a TYPENAME context. */
9890 if (type_quals != TYPE_UNQUALIFIED)
9892 error ("type qualifiers specified for friend class declaration");
9893 type_quals = TYPE_UNQUALIFIED;
9897 error ("%<inline%> specified for friend class declaration");
9903 /* Don't allow friend declaration without a class-key. */
9904 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9905 permerror (input_location, "template parameters cannot be friends");
9906 else if (TREE_CODE (type) == TYPENAME_TYPE)
9907 permerror (input_location, "friend declaration requires class-key, "
9908 "i.e. %<friend class %T::%D%>",
9909 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9911 permerror (input_location, "friend declaration requires class-key, "
9912 "i.e. %<friend %#T%>",
9916 /* Only try to do this stuff if we didn't already give up. */
9917 if (type != integer_type_node)
9919 /* A friendly class? */
9920 if (current_class_type)
9921 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9924 error ("trying to make class %qT a friend of global scope",
9927 type = void_type_node;
9930 else if (memfn_quals)
9932 if (ctype == NULL_TREE
9933 && TREE_CODE (type) == METHOD_TYPE)
9934 ctype = TYPE_METHOD_BASETYPE (type);
9937 type = build_memfn_type (type, ctype, memfn_quals);
9938 /* Core issue #547: need to allow this in template type args. */
9939 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9940 type = apply_memfn_quals (type, memfn_quals);
9942 error ("invalid qualifiers on non-member function type");
9947 else if (unqualified_id == NULL_TREE && decl_context != PARM
9948 && decl_context != CATCHPARM
9949 && TREE_CODE (type) != UNION_TYPE
9952 error ("abstract declarator %qT used as declaration", type);
9953 return error_mark_node;
9956 /* Only functions may be declared using an operator-function-id. */
9958 && IDENTIFIER_OPNAME_P (unqualified_id)
9959 && TREE_CODE (type) != FUNCTION_TYPE
9960 && TREE_CODE (type) != METHOD_TYPE)
9962 error ("declaration of %qD as non-function", unqualified_id);
9963 return error_mark_node;
9966 /* We don't check parameter types here because we can emit a better
9967 error message later. */
9968 if (decl_context != PARM)
9970 type = check_var_type (unqualified_id, type);
9971 if (type == error_mark_node)
9972 return error_mark_node;
9975 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9976 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9978 if (decl_context == PARM || decl_context == CATCHPARM)
9980 if (ctype || in_namespace)
9981 error ("cannot use %<::%> in parameter declaration");
9983 if (type_uses_auto (type))
9985 error ("parameter declared %<auto%>");
9986 type = error_mark_node;
9989 /* A parameter declared as an array of T is really a pointer to T.
9990 One declared as a function is really a pointer to a function.
9991 One declared as a member is really a pointer to member. */
9993 if (TREE_CODE (type) == ARRAY_TYPE)
9995 /* Transfer const-ness of array into that of type pointed to. */
9996 type = build_pointer_type (TREE_TYPE (type));
9997 type_quals = TYPE_UNQUALIFIED;
9999 else if (TREE_CODE (type) == FUNCTION_TYPE)
10000 type = build_pointer_type (type);
10003 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
10004 && !NEW_DELETE_OPNAME_P (unqualified_id))
10006 cp_cv_quals real_quals = memfn_quals;
10007 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
10008 real_quals |= TYPE_QUAL_CONST;
10009 type = build_memfn_type (type, ctype, real_quals);
10015 if (decl_context == PARM)
10017 decl = cp_build_parm_decl (unqualified_id, type);
10019 bad_specifiers (decl, BSP_PARM, virtualp,
10020 memfn_quals != TYPE_UNQUALIFIED,
10021 inlinep, friendp, raises != NULL_TREE);
10023 else if (decl_context == FIELD)
10025 if (!staticp && type_uses_auto (type))
10027 error ("non-static data member declared %<auto%>");
10028 type = error_mark_node;
10031 /* The C99 flexible array extension. */
10032 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
10033 && TYPE_DOMAIN (type) == NULL_TREE)
10035 tree itype = compute_array_index_type (dname, integer_zero_node,
10036 tf_warning_or_error);
10037 type = build_cplus_array_type (TREE_TYPE (type), itype);
10040 if (type == error_mark_node)
10042 /* Happens when declaring arrays of sizes which
10043 are error_mark_node, for example. */
10046 else if (in_namespace && !friendp)
10048 /* Something like struct S { int N::j; }; */
10049 error ("invalid use of %<::%>");
10050 return error_mark_node;
10052 else if (TREE_CODE (type) == FUNCTION_TYPE
10053 || TREE_CODE (type) == METHOD_TYPE)
10056 tree function_context;
10060 /* This should never happen in pure C++ (the check
10061 could be an assert). It could happen in
10062 Objective-C++ if someone writes invalid code that
10063 uses a function declaration for an instance
10064 variable or property (instance variables and
10065 properties are parsed as FIELD_DECLs, but they are
10066 part of an Objective-C class, not a C++ class).
10067 That code is invalid and is caught by this
10071 error ("declaration of function %qD in invalid context",
10073 return error_mark_node;
10076 /* ``A union may [ ... ] not [ have ] virtual functions.''
10078 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10080 error ("function %qD declared virtual inside a union",
10082 return error_mark_node;
10085 if (NEW_DELETE_OPNAME_P (unqualified_id))
10089 error ("%qD cannot be declared virtual, since it "
10090 "is always static",
10097 /* Check that the name used for a destructor makes sense. */
10098 if (sfk == sfk_destructor)
10100 tree uqname = id_declarator->u.id.unqualified_name;
10104 gcc_assert (friendp);
10105 error ("expected qualified name in friend declaration "
10106 "for destructor %qD", uqname);
10107 return error_mark_node;
10110 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10112 error ("declaration of %qD as member of %qT",
10114 return error_mark_node;
10118 error ("a destructor cannot be %<constexpr%>");
10119 return error_mark_node;
10122 else if (sfk == sfk_constructor && friendp && !ctype)
10124 error ("expected qualified name in friend declaration "
10125 "for constructor %qD",
10126 id_declarator->u.id.unqualified_name);
10127 return error_mark_node;
10130 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10131 function_context = (ctype != NULL_TREE) ?
10132 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10133 publicp = (! friendp || ! staticp)
10134 && function_context == NULL_TREE;
10135 decl = grokfndecl (ctype, type,
10136 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10137 ? unqualified_id : dname,
10140 virtualp, flags, memfn_quals, raises,
10141 friendp ? -1 : 0, friendp, publicp,
10142 inlinep | (2 * constexpr_p),
10144 funcdef_flag, template_count, in_namespace,
10145 attrlist, declarator->id_loc);
10146 decl = set_virt_specifiers (decl, virt_specifiers);
10147 if (decl == NULL_TREE)
10148 return error_mark_node;
10150 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10151 /* The decl and setting of decl_attr is also turned off. */
10152 decl = build_decl_attribute_variant (decl, decl_attr);
10155 /* [class.conv.ctor]
10157 A constructor declared without the function-specifier
10158 explicit that can be called with a single parameter
10159 specifies a conversion from the type of its first
10160 parameter to the type of its class. Such a constructor
10161 is called a converting constructor. */
10162 if (explicitp == 2)
10163 DECL_NONCONVERTING_P (decl) = 1;
10165 else if (!staticp && !dependent_type_p (type)
10166 && !COMPLETE_TYPE_P (complete_type (type))
10167 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10169 if (unqualified_id)
10170 error ("field %qD has incomplete type", unqualified_id);
10172 error ("name %qT has incomplete type", type);
10174 /* If we're instantiating a template, tell them which
10175 instantiation made the field's type be incomplete. */
10176 if (current_class_type
10177 && TYPE_NAME (current_class_type)
10178 && IDENTIFIER_TEMPLATE (current_class_name)
10180 && declspecs->type == type)
10181 error (" in instantiation of template %qT",
10182 current_class_type);
10184 return error_mark_node;
10190 error ("%qE is neither function nor member function; "
10191 "cannot be declared friend", unqualified_id);
10199 /* Friends are treated specially. */
10200 if (ctype == current_class_type)
10201 ; /* We already issued a permerror. */
10202 else if (decl && DECL_NAME (decl))
10204 if (template_class_depth (current_class_type) == 0)
10206 decl = check_explicit_specialization
10207 (unqualified_id, decl, template_count,
10208 2 * funcdef_flag + 4);
10209 if (decl == error_mark_node)
10210 return error_mark_node;
10213 decl = do_friend (ctype, unqualified_id, decl,
10219 return error_mark_node;
10222 /* Structure field. It may not be a function, except for C++. */
10224 if (decl == NULL_TREE)
10228 /* C++ allows static class members. All other work
10229 for this is done by grokfield. */
10230 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10231 set_linkage_for_static_data_member (decl);
10232 /* Even if there is an in-class initialization, DECL
10233 is considered undefined until an out-of-class
10234 definition is provided. */
10235 DECL_EXTERNAL (decl) = 1;
10238 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10240 if (constexpr_p && !initialized)
10242 error ("constexpr static data member %qD must have an "
10243 "initializer", decl);
10244 constexpr_p = false;
10251 error ("non-static data member %qE declared %<constexpr%>",
10253 constexpr_p = false;
10255 decl = build_decl (input_location,
10256 FIELD_DECL, unqualified_id, type);
10257 DECL_NONADDRESSABLE_P (decl) = bitfield;
10258 if (bitfield && !unqualified_id)
10259 TREE_NO_WARNING (decl) = 1;
10261 if (storage_class == sc_mutable)
10263 DECL_MUTABLE_P (decl) = 1;
10264 storage_class = sc_none;
10269 /* An attempt is being made to initialize a non-static
10270 member. This is new in C++11. */
10271 maybe_warn_cpp0x (CPP0X_NSDMI);
10273 /* If this has been parsed with static storage class, but
10274 errors forced staticp to be cleared, ensure NSDMI is
10276 if (declspecs->storage_class == sc_static)
10277 DECL_INITIAL (decl) = error_mark_node;
10281 bad_specifiers (decl, BSP_FIELD, virtualp,
10282 memfn_quals != TYPE_UNQUALIFIED,
10283 inlinep, friendp, raises != NULL_TREE);
10286 else if (TREE_CODE (type) == FUNCTION_TYPE
10287 || TREE_CODE (type) == METHOD_TYPE)
10289 tree original_name;
10292 if (!unqualified_id)
10293 return error_mark_node;
10295 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10296 original_name = dname;
10298 original_name = unqualified_id;
10300 if (storage_class == sc_auto)
10301 error ("storage class %<auto%> invalid for function %qs", name);
10302 else if (storage_class == sc_register)
10303 error ("storage class %<register%> invalid for function %qs", name);
10305 error ("storage class %<__thread%> invalid for function %qs", name);
10307 if (virt_specifiers)
10308 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10309 /* Function declaration not at top level.
10310 Storage classes other than `extern' are not allowed
10311 and `extern' makes no difference. */
10312 if (! toplevel_bindings_p ()
10313 && (storage_class == sc_static
10314 || declspecs->specs[(int)ds_inline])
10317 if (storage_class == sc_static)
10318 pedwarn (input_location, OPT_pedantic,
10319 "%<static%> specified invalid for function %qs "
10320 "declared out of global scope", name);
10322 pedwarn (input_location, OPT_pedantic,
10323 "%<inline%> specifier invalid for function %qs "
10324 "declared out of global scope", name);
10327 if (ctype == NULL_TREE)
10331 error ("virtual non-class function %qs", name);
10334 else if (sfk == sfk_constructor
10335 || sfk == sfk_destructor)
10337 error (funcdef_flag
10338 ? G_("%qs defined in a non-class scope")
10339 : G_("%qs declared in a non-class scope"), name);
10344 /* Record presence of `static'. */
10345 publicp = (ctype != NULL_TREE
10346 || storage_class == sc_extern
10347 || storage_class != sc_static);
10349 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10350 virtualp, flags, memfn_quals, raises,
10352 publicp, inlinep | (2 * constexpr_p), sfk,
10354 template_count, in_namespace, attrlist,
10355 declarator->id_loc);
10356 if (decl == NULL_TREE)
10357 return error_mark_node;
10361 int invalid_static = 0;
10363 /* Don't allow a static member function in a class, and forbid
10364 declaring main to be static. */
10365 if (TREE_CODE (type) == METHOD_TYPE)
10367 permerror (input_location, "cannot declare member function %qD to have "
10368 "static linkage", decl);
10369 invalid_static = 1;
10371 else if (current_function_decl)
10373 /* FIXME need arm citation */
10374 error ("cannot declare static function inside another function");
10375 invalid_static = 1;
10378 if (invalid_static)
10381 storage_class = sc_none;
10387 /* It's a variable. */
10389 /* An uninitialized decl with `extern' is a reference. */
10390 decl = grokvardecl (type, unqualified_id,
10393 (type_quals & TYPE_QUAL_CONST) != 0,
10394 ctype ? ctype : in_namespace);
10395 bad_specifiers (decl, BSP_VAR, virtualp,
10396 memfn_quals != TYPE_UNQUALIFIED,
10397 inlinep, friendp, raises != NULL_TREE);
10401 DECL_CONTEXT (decl) = ctype;
10404 permerror (input_location, "%<static%> may not be used when defining "
10405 "(as opposed to declaring) a static data member");
10407 storage_class = sc_none;
10409 if (storage_class == sc_register && TREE_STATIC (decl))
10411 error ("static member %qD declared %<register%>", decl);
10412 storage_class = sc_none;
10414 if (storage_class == sc_extern && pedantic)
10416 pedwarn (input_location, OPT_pedantic,
10417 "cannot explicitly declare member %q#D to have "
10418 "extern linkage", decl);
10419 storage_class = sc_none;
10422 else if (constexpr_p && DECL_EXTERNAL (decl))
10424 error ("declaration of constexpr variable %qD is not a definition",
10426 constexpr_p = false;
10430 if (storage_class == sc_extern && initialized && !funcdef_flag)
10432 if (toplevel_bindings_p ())
10434 /* It's common practice (and completely valid) to have a const
10435 be initialized and declared extern. */
10436 if (!(type_quals & TYPE_QUAL_CONST))
10437 warning (0, "%qs initialized and declared %<extern%>", name);
10441 error ("%qs has both %<extern%> and initializer", name);
10442 return error_mark_node;
10446 /* Record `register' declaration for warnings on &
10447 and in case doing stupid register allocation. */
10449 if (storage_class == sc_register)
10450 DECL_REGISTER (decl) = 1;
10451 else if (storage_class == sc_extern)
10452 DECL_THIS_EXTERN (decl) = 1;
10453 else if (storage_class == sc_static)
10454 DECL_THIS_STATIC (decl) = 1;
10456 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10457 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10458 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10460 /* Record constancy and volatility on the DECL itself . There's
10461 no need to do this when processing a template; we'll do this
10462 for the instantiated declaration based on the type of DECL. */
10463 if (!processing_template_decl)
10464 cp_apply_type_quals_to_decl (type_quals, decl);
10470 /* Subroutine of start_function. Ensure that each of the parameter
10471 types (as listed in PARMS) is complete, as is required for a
10472 function definition. */
10475 require_complete_types_for_parms (tree parms)
10477 for (; parms; parms = DECL_CHAIN (parms))
10479 if (dependent_type_p (TREE_TYPE (parms)))
10481 if (!VOID_TYPE_P (TREE_TYPE (parms))
10482 && complete_type_or_else (TREE_TYPE (parms), parms))
10484 relayout_decl (parms);
10485 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10488 /* grokparms or complete_type_or_else will have already issued
10490 TREE_TYPE (parms) = error_mark_node;
10494 /* Returns nonzero if T is a local variable. */
10497 local_variable_p (const_tree t)
10499 if ((TREE_CODE (t) == VAR_DECL
10500 /* A VAR_DECL with a context that is a _TYPE is a static data
10502 && !TYPE_P (CP_DECL_CONTEXT (t))
10503 /* Any other non-local variable must be at namespace scope. */
10504 && !DECL_NAMESPACE_SCOPE_P (t))
10505 || (TREE_CODE (t) == PARM_DECL))
10511 /* Like local_variable_p, but suitable for use as a tree-walking
10515 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10516 void *data ATTRIBUTE_UNUSED)
10518 /* Check DECL_NAME to avoid including temporaries. We don't check
10519 DECL_ARTIFICIAL because we do want to complain about 'this'. */
10520 if (local_variable_p (*tp) && DECL_NAME (*tp))
10522 else if (TYPE_P (*tp))
10523 *walk_subtrees = 0;
10528 /* Check that ARG, which is a default-argument expression for a
10529 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10530 something goes wrong. DECL may also be a _TYPE node, rather than a
10531 DECL, if there is no DECL available. */
10534 check_default_argument (tree decl, tree arg)
10539 if (TREE_CODE (arg) == DEFAULT_ARG)
10540 /* We get a DEFAULT_ARG when looking at an in-class declaration
10541 with a default argument. Ignore the argument for now; we'll
10542 deal with it after the class is complete. */
10551 decl_type = TREE_TYPE (decl);
10553 if (arg == error_mark_node
10554 || decl == error_mark_node
10555 || TREE_TYPE (arg) == error_mark_node
10556 || decl_type == error_mark_node)
10557 /* Something already went wrong. There's no need to check
10559 return error_mark_node;
10561 /* [dcl.fct.default]
10563 A default argument expression is implicitly converted to the
10565 if (!TREE_TYPE (arg)
10566 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10569 error ("default argument for %q#D has type %qT",
10570 decl, TREE_TYPE (arg));
10572 error ("default argument for parameter of type %qT has type %qT",
10573 decl_type, TREE_TYPE (arg));
10575 return error_mark_node;
10578 /* [dcl.fct.default]
10580 Local variables shall not be used in default argument
10583 The keyword `this' shall not be used in a default argument of a
10584 member function. */
10585 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10588 if (DECL_NAME (var) == this_identifier)
10589 permerror (input_location, "default argument %qE uses %qD", arg, var);
10591 error ("default argument %qE uses local variable %qD", arg, var);
10592 return error_mark_node;
10599 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10602 type_is_deprecated (tree type)
10604 enum tree_code code;
10605 if (TREE_DEPRECATED (type))
10607 if (TYPE_NAME (type)
10608 && TREE_DEPRECATED (TYPE_NAME (type)))
10611 /* Do warn about using typedefs to a deprecated class. */
10612 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10613 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10615 code = TREE_CODE (type);
10617 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10618 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10619 || code == METHOD_TYPE || code == ARRAY_TYPE)
10620 return type_is_deprecated (TREE_TYPE (type));
10622 if (TYPE_PTRMEMFUNC_P (type))
10623 return type_is_deprecated
10624 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10629 /* Decode the list of parameter types for a function type.
10630 Given the list of things declared inside the parens,
10631 return a list of types.
10633 If this parameter does not end with an ellipsis, we append
10636 *PARMS is set to the chain of PARM_DECLs created. */
10639 grokparms (tree parmlist, tree *parms)
10641 tree result = NULL_TREE;
10642 tree decls = NULL_TREE;
10646 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10648 tree type = NULL_TREE;
10649 tree init = TREE_PURPOSE (parm);
10650 tree decl = TREE_VALUE (parm);
10651 const char *errmsg;
10653 if (parm == void_list_node)
10656 if (! decl || TREE_TYPE (decl) == error_mark_node)
10659 type = TREE_TYPE (decl);
10660 if (VOID_TYPE_P (type))
10662 if (same_type_p (type, void_type_node)
10663 && DECL_SELF_REFERENCE_P (type)
10664 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10665 /* this is a parmlist of `(void)', which is ok. */
10667 cxx_incomplete_type_error (decl, type);
10668 /* It's not a good idea to actually create parameters of
10669 type `void'; other parts of the compiler assume that a
10670 void type terminates the parameter list. */
10671 type = error_mark_node;
10672 TREE_TYPE (decl) = error_mark_node;
10675 if (type != error_mark_node
10676 && TYPE_FOR_JAVA (type)
10677 && MAYBE_CLASS_TYPE_P (type))
10679 error ("parameter %qD has Java class type", decl);
10680 type = error_mark_node;
10681 TREE_TYPE (decl) = error_mark_node;
10685 if (type != error_mark_node
10686 && (errmsg = targetm.invalid_parameter_type (type)))
10689 type = error_mark_node;
10690 TREE_TYPE (decl) = error_mark_node;
10693 if (type != error_mark_node)
10695 if (deprecated_state != DEPRECATED_SUPPRESS)
10697 tree deptype = type_is_deprecated (type);
10699 warn_deprecated_use (deptype, NULL_TREE);
10702 /* Top-level qualifiers on the parameters are
10703 ignored for function types. */
10704 type = cp_build_qualified_type (type, 0);
10705 if (TREE_CODE (type) == METHOD_TYPE)
10707 error ("parameter %qD invalidly declared method type", decl);
10708 type = build_pointer_type (type);
10709 TREE_TYPE (decl) = type;
10711 else if (abstract_virtuals_error (decl, type))
10712 any_error = 1; /* Seems like a good idea. */
10713 else if (POINTER_TYPE_P (type))
10715 /* [dcl.fct]/6, parameter types cannot contain pointers
10716 (references) to arrays of unknown bound. */
10717 tree t = TREE_TYPE (type);
10718 int ptr = TYPE_PTR_P (type);
10722 if (TYPE_PTR_P (t))
10724 else if (TREE_CODE (t) != ARRAY_TYPE)
10726 else if (!TYPE_DOMAIN (t))
10730 if (TREE_CODE (t) == ARRAY_TYPE)
10732 ? G_("parameter %qD includes pointer to array of "
10733 "unknown bound %qT")
10734 : G_("parameter %qD includes reference to array of "
10735 "unknown bound %qT"),
10741 else if (init && !processing_template_decl)
10742 init = check_default_argument (decl, init);
10745 DECL_CHAIN (decl) = decls;
10747 result = tree_cons (init, type, result);
10749 decls = nreverse (decls);
10750 result = nreverse (result);
10752 result = chainon (result, void_list_node);
10759 /* D is a constructor or overloaded `operator='.
10761 Let T be the class in which D is declared. Then, this function
10764 -1 if D's is an ill-formed constructor or copy assignment operator
10765 whose first parameter is of type `T'.
10766 0 if D is not a copy constructor or copy assignment
10768 1 if D is a copy constructor or copy assignment operator whose
10769 first parameter is a reference to non-const qualified T.
10770 2 if D is a copy constructor or copy assignment operator whose
10771 first parameter is a reference to const qualified T.
10773 This function can be used as a predicate. Positive values indicate
10774 a copy constructor and nonzero values indicate a copy assignment
10778 copy_fn_p (const_tree d)
10784 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10786 if (TREE_CODE (d) == TEMPLATE_DECL
10787 || (DECL_TEMPLATE_INFO (d)
10788 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10789 /* Instantiations of template member functions are never copy
10790 functions. Note that member functions of templated classes are
10791 represented as template functions internally, and we must
10792 accept those as copy functions. */
10795 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10799 arg_type = TREE_VALUE (args);
10800 if (arg_type == error_mark_node)
10803 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10805 /* Pass by value copy assignment operator. */
10808 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10809 && !TYPE_REF_IS_RVALUE (arg_type)
10810 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10812 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10818 args = TREE_CHAIN (args);
10820 if (args && args != void_list_node && !TREE_PURPOSE (args))
10821 /* There are more non-optional args. */
10827 /* D is a constructor or overloaded `operator='.
10829 Let T be the class in which D is declared. Then, this function
10830 returns true when D is a move constructor or move assignment
10831 operator, false otherwise. */
10834 move_fn_p (const_tree d)
10838 bool result = false;
10840 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10842 if (cxx_dialect == cxx98)
10843 /* There are no move constructors if we are in C++98 mode. */
10846 if (TREE_CODE (d) == TEMPLATE_DECL
10847 || (DECL_TEMPLATE_INFO (d)
10848 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10849 /* Instantiations of template member functions are never copy
10850 functions. Note that member functions of templated classes are
10851 represented as template functions internally, and we must
10852 accept those as copy functions. */
10855 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10859 arg_type = TREE_VALUE (args);
10860 if (arg_type == error_mark_node)
10863 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10864 && TYPE_REF_IS_RVALUE (arg_type)
10865 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10869 args = TREE_CHAIN (args);
10871 if (args && args != void_list_node && !TREE_PURPOSE (args))
10872 /* There are more non-optional args. */
10878 /* Remember any special properties of member function DECL. */
10881 grok_special_member_properties (tree decl)
10885 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10888 class_type = DECL_CONTEXT (decl);
10889 if (DECL_CONSTRUCTOR_P (decl))
10891 int ctor = copy_fn_p (decl);
10893 if (!DECL_ARTIFICIAL (decl))
10894 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10900 A non-template constructor for class X is a copy
10901 constructor if its first parameter is of type X&, const
10902 X&, volatile X& or const volatile X&, and either there
10903 are no other parameters or else all other parameters have
10904 default arguments. */
10905 TYPE_HAS_COPY_CTOR (class_type) = 1;
10906 if (user_provided_p (decl))
10907 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10909 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10911 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10913 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10914 if (user_provided_p (decl))
10915 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10917 else if (move_fn_p (decl) && user_provided_p (decl))
10918 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10919 else if (is_list_ctor (decl))
10920 TYPE_HAS_LIST_CTOR (class_type) = 1;
10922 if (DECL_DECLARED_CONSTEXPR_P (decl)
10923 && !copy_fn_p (decl) && !move_fn_p (decl))
10924 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10926 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10930 A non-template assignment operator for class X is a copy
10931 assignment operator if its parameter is of type X, X&, const
10932 X&, volatile X& or const volatile X&. */
10934 int assop = copy_fn_p (decl);
10938 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10939 if (user_provided_p (decl))
10940 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10942 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10944 else if (move_fn_p (decl) && user_provided_p (decl))
10945 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10947 /* Destructors are handled in check_methods. */
10950 /* Check a constructor DECL has the correct form. Complains
10951 if the class has a constructor of the form X(X). */
10954 grok_ctor_properties (const_tree ctype, const_tree decl)
10956 int ctor_parm = copy_fn_p (decl);
10962 A declaration of a constructor for a class X is ill-formed if
10963 its first parameter is of type (optionally cv-qualified) X
10964 and either there are no other parameters or else all other
10965 parameters have default arguments.
10967 We *don't* complain about member template instantiations that
10968 have this form, though; they can occur as we try to decide
10969 what constructor to use during overload resolution. Since
10970 overload resolution will never prefer such a constructor to
10971 the non-template copy constructor (which is either explicitly
10972 or implicitly defined), there's no need to worry about their
10973 existence. Theoretically, they should never even be
10974 instantiated, but that's hard to forestall. */
10975 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10983 /* An operator with this code is unary, but can also be binary. */
10986 ambi_op_p (enum tree_code code)
10988 return (code == INDIRECT_REF
10989 || code == ADDR_EXPR
10990 || code == UNARY_PLUS_EXPR
10991 || code == NEGATE_EXPR
10992 || code == PREINCREMENT_EXPR
10993 || code == PREDECREMENT_EXPR);
10996 /* An operator with this name can only be unary. */
10999 unary_op_p (enum tree_code code)
11001 return (code == TRUTH_NOT_EXPR
11002 || code == BIT_NOT_EXPR
11003 || code == COMPONENT_REF
11004 || code == TYPE_EXPR);
11007 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
11008 errors are issued for invalid declarations. */
11011 grok_op_properties (tree decl, bool complain)
11013 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
11015 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
11016 tree name = DECL_NAME (decl);
11017 enum tree_code operator_code;
11022 /* Count the number of arguments and check for ellipsis. */
11023 for (argtype = argtypes, arity = 0;
11024 argtype && argtype != void_list_node;
11025 argtype = TREE_CHAIN (argtype))
11027 ellipsis_p = !argtype;
11029 class_type = DECL_CONTEXT (decl);
11030 if (class_type && !CLASS_TYPE_P (class_type))
11031 class_type = NULL_TREE;
11033 if (DECL_CONV_FN_P (decl))
11034 operator_code = TYPE_EXPR;
11038 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
11039 if (ansi_opname (CODE) == name) \
11041 operator_code = (CODE); \
11044 else if (ansi_assopname (CODE) == name) \
11046 operator_code = (CODE); \
11047 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
11051 #include "operators.def"
11052 #undef DEF_OPERATOR
11054 gcc_unreachable ();
11057 gcc_assert (operator_code != MAX_TREE_CODES);
11058 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11061 switch (operator_code)
11064 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11068 TYPE_GETS_DELETE (class_type) |= 1;
11072 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11075 case VEC_DELETE_EXPR:
11076 TYPE_GETS_DELETE (class_type) |= 2;
11083 /* [basic.std.dynamic.allocation]/1:
11085 A program is ill-formed if an allocation function is declared
11086 in a namespace scope other than global scope or declared static
11089 The same also holds true for deallocation functions. */
11090 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11091 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11093 if (DECL_NAMESPACE_SCOPE_P (decl))
11095 if (CP_DECL_CONTEXT (decl) != global_namespace)
11097 error ("%qD may not be declared within a namespace", decl);
11100 else if (!TREE_PUBLIC (decl))
11102 error ("%qD may not be declared as static", decl);
11108 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11110 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11111 DECL_IS_OPERATOR_NEW (decl) = 1;
11113 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11114 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11117 /* An operator function must either be a non-static member function
11118 or have at least one parameter of a class, a reference to a class,
11119 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11120 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11122 if (operator_code == TYPE_EXPR
11123 || operator_code == CALL_EXPR
11124 || operator_code == COMPONENT_REF
11125 || operator_code == ARRAY_REF
11126 || operator_code == NOP_EXPR)
11128 error ("%qD must be a nonstatic member function", decl);
11135 if (DECL_STATIC_FUNCTION_P (decl))
11137 error ("%qD must be either a non-static member "
11138 "function or a non-member function", decl);
11142 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11144 tree arg = non_reference (TREE_VALUE (p));
11145 if (arg == error_mark_node)
11148 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11149 because these checks are performed even on
11150 template functions. */
11151 if (MAYBE_CLASS_TYPE_P (arg)
11152 || TREE_CODE (arg) == ENUMERAL_TYPE)
11156 if (!p || p == void_list_node)
11159 error ("%qD must have an argument of class or "
11160 "enumerated type", decl);
11166 /* There are no restrictions on the arguments to an overloaded
11168 if (operator_code == CALL_EXPR)
11171 /* Warn about conversion operators that will never be used. */
11172 if (IDENTIFIER_TYPENAME_P (name)
11173 && ! DECL_TEMPLATE_INFO (decl)
11175 /* Warn only declaring the function; there is no need to
11176 warn again about out-of-class definitions. */
11177 && class_type == current_class_type)
11179 tree t = TREE_TYPE (name);
11180 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11183 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11185 if (TREE_CODE (t) == VOID_TYPE)
11186 warning (OPT_Wconversion,
11188 ? G_("conversion to a reference to void "
11189 "will never use a type conversion operator")
11190 : G_("conversion to void "
11191 "will never use a type conversion operator"));
11192 else if (class_type)
11194 if (t == class_type)
11195 warning (OPT_Wconversion,
11197 ? G_("conversion to a reference to the same type "
11198 "will never use a type conversion operator")
11199 : G_("conversion to the same type "
11200 "will never use a type conversion operator"));
11201 /* Don't force t to be complete here. */
11202 else if (MAYBE_CLASS_TYPE_P (t)
11203 && COMPLETE_TYPE_P (t)
11204 && DERIVED_FROM_P (t, class_type))
11205 warning (OPT_Wconversion,
11207 ? G_("conversion to a reference to a base class "
11208 "will never use a type conversion operator")
11209 : G_("conversion to a base class "
11210 "will never use a type conversion operator"));
11215 if (operator_code == COND_EXPR)
11218 error ("ISO C++ prohibits overloading operator ?:");
11221 else if (ellipsis_p)
11223 error ("%qD must not have variable number of arguments", decl);
11226 else if (ambi_op_p (operator_code))
11229 /* We pick the one-argument operator codes by default, so
11230 we don't have to change anything. */
11232 else if (arity == 2)
11234 /* If we thought this was a unary operator, we now know
11235 it to be a binary operator. */
11236 switch (operator_code)
11239 operator_code = MULT_EXPR;
11243 operator_code = BIT_AND_EXPR;
11246 case UNARY_PLUS_EXPR:
11247 operator_code = PLUS_EXPR;
11251 operator_code = MINUS_EXPR;
11254 case PREINCREMENT_EXPR:
11255 operator_code = POSTINCREMENT_EXPR;
11258 case PREDECREMENT_EXPR:
11259 operator_code = POSTDECREMENT_EXPR;
11263 gcc_unreachable ();
11266 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11268 if ((operator_code == POSTINCREMENT_EXPR
11269 || operator_code == POSTDECREMENT_EXPR)
11270 && ! processing_template_decl
11271 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11274 error ("postfix %qD must take %<int%> as its argument",
11277 error ("postfix %qD must take %<int%> as its second "
11285 error ("%qD must take either zero or one argument", decl);
11287 error ("%qD must take either one or two arguments", decl);
11291 /* More Effective C++ rule 6. */
11293 && (operator_code == POSTINCREMENT_EXPR
11294 || operator_code == POSTDECREMENT_EXPR
11295 || operator_code == PREINCREMENT_EXPR
11296 || operator_code == PREDECREMENT_EXPR))
11298 tree arg = TREE_VALUE (argtypes);
11299 tree ret = TREE_TYPE (TREE_TYPE (decl));
11300 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11301 arg = TREE_TYPE (arg);
11302 arg = TYPE_MAIN_VARIANT (arg);
11303 if (operator_code == PREINCREMENT_EXPR
11304 || operator_code == PREDECREMENT_EXPR)
11306 if (TREE_CODE (ret) != REFERENCE_TYPE
11307 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11309 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11310 build_reference_type (arg));
11314 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11315 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11319 else if (unary_op_p (operator_code))
11324 error ("%qD must take %<void%>", decl);
11326 error ("%qD must take exactly one argument", decl);
11330 else /* if (binary_op_p (operator_code)) */
11335 error ("%qD must take exactly one argument", decl);
11337 error ("%qD must take exactly two arguments", decl);
11341 /* More Effective C++ rule 7. */
11343 && (operator_code == TRUTH_ANDIF_EXPR
11344 || operator_code == TRUTH_ORIF_EXPR
11345 || operator_code == COMPOUND_EXPR))
11346 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11350 /* Effective C++ rule 23. */
11353 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11354 && (operator_code == PLUS_EXPR
11355 || operator_code == MINUS_EXPR
11356 || operator_code == TRUNC_DIV_EXPR
11357 || operator_code == MULT_EXPR
11358 || operator_code == TRUNC_MOD_EXPR)
11359 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11360 warning (OPT_Weffc__, "%qD should return by value", decl);
11362 /* [over.oper]/8 */
11363 for (; argtypes && argtypes != void_list_node;
11364 argtypes = TREE_CHAIN (argtypes))
11365 if (TREE_PURPOSE (argtypes))
11367 TREE_PURPOSE (argtypes) = NULL_TREE;
11368 if (operator_code == POSTINCREMENT_EXPR
11369 || operator_code == POSTDECREMENT_EXPR)
11371 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11376 error ("%qD cannot have default arguments", decl);
11384 /* Return a string giving the keyword associate with CODE. */
11386 static const char *
11387 tag_name (enum tag_types code)
11399 case typename_type:
11402 gcc_unreachable ();
11406 /* Name lookup in an elaborated-type-specifier (after the keyword
11407 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11408 elaborated-type-specifier is invalid, issue a diagnostic and return
11409 error_mark_node; otherwise, return the *_TYPE to which it referred.
11410 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11413 check_elaborated_type_specifier (enum tag_types tag_code,
11415 bool allow_template_p)
11419 if (decl == error_mark_node)
11420 return error_mark_node;
11424 struct S { struct S *p; };
11426 name lookup will find the TYPE_DECL for the implicit "S::S"
11427 typedef. Adjust for that here. */
11428 if (DECL_SELF_REFERENCE_P (decl))
11429 decl = TYPE_NAME (TREE_TYPE (decl));
11431 type = TREE_TYPE (decl);
11433 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11434 is false for this case as well. */
11435 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11437 error ("using template type parameter %qT after %qs",
11438 type, tag_name (tag_code));
11439 return error_mark_node;
11441 /* Accept bound template template parameters. */
11442 else if (allow_template_p
11443 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11447 If the identifier resolves to a typedef-name or the
11448 simple-template-id resolves to an alias template
11449 specialization, the elaborated-type-specifier is ill-formed.
11451 In other words, the only legitimate declaration to use in the
11452 elaborated type specifier is the implicit typedef created when
11453 the type is declared. */
11454 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11455 && !DECL_SELF_REFERENCE_P (decl)
11456 && tag_code != typename_type)
11458 if (alias_template_specialization_p (type))
11459 error ("using alias template specialization %qT after %qs",
11460 type, tag_name (tag_code));
11462 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11463 inform (DECL_SOURCE_LOCATION (decl),
11464 "%qD has a previous declaration here", decl);
11465 return error_mark_node;
11467 else if (TREE_CODE (type) != RECORD_TYPE
11468 && TREE_CODE (type) != UNION_TYPE
11469 && tag_code != enum_type
11470 && tag_code != typename_type)
11472 error ("%qT referred to as %qs", type, tag_name (tag_code));
11473 error ("%q+T has a previous declaration here", type);
11474 return error_mark_node;
11476 else if (TREE_CODE (type) != ENUMERAL_TYPE
11477 && tag_code == enum_type)
11479 error ("%qT referred to as enum", type);
11480 error ("%q+T has a previous declaration here", type);
11481 return error_mark_node;
11483 else if (!allow_template_p
11484 && TREE_CODE (type) == RECORD_TYPE
11485 && CLASSTYPE_IS_TEMPLATE (type))
11487 /* If a class template appears as elaborated type specifier
11488 without a template header such as:
11490 template <class T> class C {};
11491 void f(class C); // No template header here
11493 then the required template argument is missing. */
11494 error ("template argument required for %<%s %T%>",
11495 tag_name (tag_code),
11496 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11497 return error_mark_node;
11503 /* Lookup NAME in elaborate type specifier in scope according to
11504 SCOPE and issue diagnostics if necessary.
11505 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11506 found, and ERROR_MARK_NODE for type error. */
11509 lookup_and_check_tag (enum tag_types tag_code, tree name,
11510 tag_scope scope, bool template_header_p)
11514 if (scope == ts_global)
11516 /* First try ordinary name lookup, ignoring hidden class name
11517 injected via friend declaration. */
11518 decl = lookup_name_prefer_type (name, 2);
11519 /* If that fails, the name will be placed in the smallest
11520 non-class, non-function-prototype scope according to 3.3.1/5.
11521 We may already have a hidden name declared as friend in this
11522 scope. So lookup again but not ignoring hidden names.
11523 If we find one, that name will be made visible rather than
11524 creating a new tag. */
11526 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11529 decl = lookup_type_scope (name, scope);
11531 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11532 decl = DECL_TEMPLATE_RESULT (decl);
11534 if (decl && TREE_CODE (decl) == TYPE_DECL)
11536 /* Look for invalid nested type:
11540 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11542 error ("%qD has the same name as the class in which it is "
11545 return error_mark_node;
11548 /* Two cases we need to consider when deciding if a class
11549 template is allowed as an elaborated type specifier:
11550 1. It is a self reference to its own class.
11551 2. It comes with a template header.
11555 template <class T> class C {
11556 class C *c1; // DECL_SELF_REFERENCE_P is true
11559 template <class U> class C; // template_header_p is true
11560 template <class T> class C<T>::D {
11561 class C *c2; // DECL_SELF_REFERENCE_P is true
11564 t = check_elaborated_type_specifier (tag_code,
11567 | DECL_SELF_REFERENCE_P (decl));
11570 else if (decl && TREE_CODE (decl) == TREE_LIST)
11572 error ("reference to %qD is ambiguous", name);
11573 print_candidates (decl);
11574 return error_mark_node;
11580 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11581 Define the tag as a forward-reference if it is not defined.
11583 If a declaration is given, process it here, and report an error if
11584 multiple declarations are not identical.
11586 SCOPE is TS_CURRENT when this is also a definition. Only look in
11587 the current frame for the name (since C++ allows new names in any
11588 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11589 declaration. Only look beginning from the current scope outward up
11590 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11592 TEMPLATE_HEADER_P is true when this declaration is preceded by
11593 a set of template parameters. */
11596 xref_tag_1 (enum tag_types tag_code, tree name,
11597 tag_scope scope, bool template_header_p)
11599 enum tree_code code;
11601 tree context = NULL_TREE;
11603 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11609 code = RECORD_TYPE;
11615 code = ENUMERAL_TYPE;
11618 gcc_unreachable ();
11621 /* In case of anonymous name, xref_tag is only called to
11622 make type node and push name. Name lookup is not required. */
11623 if (ANON_AGGRNAME_P (name))
11626 t = lookup_and_check_tag (tag_code, name,
11627 scope, template_header_p);
11629 if (t == error_mark_node)
11630 return error_mark_node;
11632 if (scope != ts_current && t && current_class_type
11633 && template_class_depth (current_class_type)
11634 && template_header_p)
11636 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11637 definition of this tag. Since, in addition, we are currently
11638 processing a (member) template declaration of a template
11639 class, we must be very careful; consider:
11646 { template <class V>
11647 friend struct S1; };
11649 Here, the S2::S1 declaration should not be confused with the
11650 outer declaration. In particular, the inner version should
11651 have a template parameter of level 2, not level 1. This
11652 would be particularly important if the member declaration
11655 template <class V = U> friend struct S1;
11657 say, when we should tsubst into `U' when instantiating
11658 S2. On the other hand, when presented with:
11668 we must find the inner binding eventually. We
11669 accomplish this by making sure that the new type we
11670 create to represent this declaration has the right
11672 context = TYPE_CONTEXT (t);
11678 /* If no such tag is yet defined, create a forward-reference node
11679 and record it as the "definition".
11680 When a real declaration of this type is found,
11681 the forward-reference will be altered into a real type. */
11682 if (code == ENUMERAL_TYPE)
11684 error ("use of enum %q#D without previous declaration", name);
11685 return error_mark_node;
11689 t = make_class_type (code);
11690 TYPE_CONTEXT (t) = context;
11691 t = pushtag (name, t, scope);
11696 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11698 if (!redeclare_class_template (t, current_template_parms))
11699 return error_mark_node;
11701 else if (!processing_template_decl
11702 && CLASS_TYPE_P (t)
11703 && CLASSTYPE_IS_TEMPLATE (t))
11705 error ("redeclaration of %qT as a non-template", t);
11706 error ("previous declaration %q+D", t);
11707 return error_mark_node;
11710 /* Make injected friend class visible. */
11711 if (scope != ts_within_enclosing_non_class
11712 && hidden_name_p (TYPE_NAME (t)))
11714 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11715 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11717 if (TYPE_TEMPLATE_INFO (t))
11719 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11720 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11728 /* Wrapper for xref_tag_1. */
11731 xref_tag (enum tag_types tag_code, tree name,
11732 tag_scope scope, bool template_header_p)
11736 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11737 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11738 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11744 xref_tag_from_type (tree old, tree id, tag_scope scope)
11746 enum tag_types tag_kind;
11748 if (TREE_CODE (old) == RECORD_TYPE)
11749 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11751 tag_kind = union_type;
11753 if (id == NULL_TREE)
11754 id = TYPE_IDENTIFIER (old);
11756 return xref_tag (tag_kind, id, scope, false);
11759 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11760 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11761 access_* node, and the TREE_VALUE is the type of the base-class.
11762 Non-NULL TREE_TYPE indicates virtual inheritance.
11764 Returns true if the binfo hierarchy was successfully created,
11765 false if an error was detected. */
11768 xref_basetypes (tree ref, tree base_list)
11771 tree binfo, base_binfo;
11772 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11773 unsigned max_bases = 0; /* Maximum direct bases. */
11775 tree default_access;
11776 tree igo_prev; /* Track Inheritance Graph Order. */
11778 if (ref == error_mark_node)
11781 /* The base of a derived class is private by default, all others are
11783 default_access = (TREE_CODE (ref) == RECORD_TYPE
11784 && CLASSTYPE_DECLARED_CLASS (ref)
11785 ? access_private_node : access_public_node);
11787 /* First, make sure that any templates in base-classes are
11788 instantiated. This ensures that if we call ourselves recursively
11789 we do not get confused about which classes are marked and which
11791 basep = &base_list;
11794 tree basetype = TREE_VALUE (*basep);
11796 if (!(processing_template_decl && uses_template_parms (basetype))
11797 && !complete_type_or_else (basetype, NULL))
11798 /* An incomplete type. Remove it from the list. */
11799 *basep = TREE_CHAIN (*basep);
11803 if (TREE_TYPE (*basep))
11805 if (CLASS_TYPE_P (basetype))
11806 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11807 basep = &TREE_CHAIN (*basep);
11811 TYPE_MARKED_P (ref) = 1;
11813 /* The binfo slot should be empty, unless this is an (ill-formed)
11815 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11817 error ("redefinition of %q#T", ref);
11821 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11823 binfo = make_tree_binfo (max_bases);
11825 TYPE_BINFO (ref) = binfo;
11826 BINFO_OFFSET (binfo) = size_zero_node;
11827 BINFO_TYPE (binfo) = ref;
11829 /* Apply base-class info set up to the variants of this type. */
11830 fixup_type_variants (ref);
11834 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11835 /* An aggregate cannot have baseclasses. */
11836 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11838 if (TREE_CODE (ref) == UNION_TYPE)
11840 error ("derived union %qT invalid", ref);
11847 if (TYPE_FOR_JAVA (ref))
11849 error ("Java class %qT cannot have multiple bases", ref);
11856 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11858 if (TYPE_FOR_JAVA (ref))
11860 error ("Java class %qT cannot have virtual bases", ref);
11865 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11867 tree access = TREE_PURPOSE (base_list);
11868 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11869 tree basetype = TREE_VALUE (base_list);
11871 if (access == access_default_node)
11872 access = default_access;
11874 if (PACK_EXPANSION_P (basetype))
11875 basetype = PACK_EXPANSION_PATTERN (basetype);
11876 if (TREE_CODE (basetype) == TYPE_DECL)
11877 basetype = TREE_TYPE (basetype);
11878 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11880 error ("base type %qT fails to be a struct or class type",
11885 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11886 TYPE_FOR_JAVA (ref) = 1;
11888 base_binfo = NULL_TREE;
11889 if (CLASS_TYPE_P (basetype) && !dependent_scope_p (basetype))
11891 base_binfo = TYPE_BINFO (basetype);
11892 /* The original basetype could have been a typedef'd type. */
11893 basetype = BINFO_TYPE (base_binfo);
11895 /* Inherit flags from the base. */
11896 TYPE_HAS_NEW_OPERATOR (ref)
11897 |= TYPE_HAS_NEW_OPERATOR (basetype);
11898 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11899 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11900 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11901 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11902 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11903 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11904 CLASSTYPE_REPEATED_BASE_P (ref)
11905 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11908 /* We must do this test after we've seen through a typedef
11910 if (TYPE_MARKED_P (basetype))
11912 if (basetype == ref)
11913 error ("recursive type %qT undefined", basetype);
11915 error ("duplicate base type %qT invalid", basetype);
11919 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11920 /* Regenerate the pack expansion for the bases. */
11921 basetype = make_pack_expansion (basetype);
11923 TYPE_MARKED_P (basetype) = 1;
11925 base_binfo = copy_binfo (base_binfo, basetype, ref,
11926 &igo_prev, via_virtual);
11927 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11928 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11930 BINFO_BASE_APPEND (binfo, base_binfo);
11931 BINFO_BASE_ACCESS_APPEND (binfo, access);
11934 if (VEC_length (tree, CLASSTYPE_VBASECLASSES (ref)) < max_vbases)
11935 /* If we didn't get max_vbases vbases, we must have shared at
11936 least one of them, and are therefore diamond shaped. */
11937 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11939 /* Unmark all the types. */
11940 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11941 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11942 TYPE_MARKED_P (ref) = 0;
11944 /* Now see if we have a repeated base type. */
11945 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11947 for (base_binfo = binfo; base_binfo;
11948 base_binfo = TREE_CHAIN (base_binfo))
11950 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11952 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11955 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11957 for (base_binfo = binfo; base_binfo;
11958 base_binfo = TREE_CHAIN (base_binfo))
11959 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11960 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11969 /* Copies the enum-related properties from type SRC to type DST.
11970 Used with the underlying type of an enum and the enum itself. */
11972 copy_type_enum (tree dst, tree src)
11975 for (t = dst; t; t = TYPE_NEXT_VARIANT (t))
11977 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (src);
11978 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (src);
11979 TYPE_SIZE (t) = TYPE_SIZE (src);
11980 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (src);
11981 SET_TYPE_MODE (dst, TYPE_MODE (src));
11982 TYPE_PRECISION (t) = TYPE_PRECISION (src);
11983 TYPE_ALIGN (t) = TYPE_ALIGN (src);
11984 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (src);
11985 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (src);
11989 /* Begin compiling the definition of an enumeration type.
11992 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11994 UNDERLYING_TYPE is the type that will be used as the storage for
11995 the enumeration type. This should be NULL_TREE if no storage type
11998 SCOPED_ENUM_P is true if this is a scoped enumeration type.
12000 if IS_NEW is not NULL, gets TRUE iff a new type is created.
12002 Returns the type object, as yet incomplete.
12003 Also records info about it so that build_enumerator
12004 may be used to declare the individual values as they are read. */
12007 start_enum (tree name, tree enumtype, tree underlying_type,
12008 bool scoped_enum_p, bool *is_new)
12010 tree prevtype = NULL_TREE;
12011 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
12015 /* [C++0x dcl.enum]p5:
12017 If not explicitly specified, the underlying type of a scoped
12018 enumeration type is int. */
12019 if (!underlying_type && scoped_enum_p)
12020 underlying_type = integer_type_node;
12022 if (underlying_type)
12023 underlying_type = cv_unqualified (underlying_type);
12025 /* If this is the real definition for a previous forward reference,
12026 fill in the contents in the same object that used to be the
12027 forward reference. */
12029 enumtype = lookup_and_check_tag (enum_type, name,
12030 /*tag_scope=*/ts_current,
12031 /*template_header_p=*/false);
12033 /* In case of a template_decl, the only check that should be deferred
12034 to instantiation time is the comparison of underlying types. */
12035 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
12037 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
12039 error_at (input_location, "scoped/unscoped mismatch "
12040 "in enum %q#T", enumtype);
12041 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12042 "previous definition here");
12043 enumtype = error_mark_node;
12045 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
12047 error_at (input_location, "underlying type mismatch "
12048 "in enum %q#T", enumtype);
12049 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12050 "previous definition here");
12051 enumtype = error_mark_node;
12053 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
12054 && !dependent_type_p (underlying_type)
12055 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
12056 && !same_type_p (underlying_type,
12057 ENUM_UNDERLYING_TYPE (enumtype)))
12059 error_at (input_location, "different underlying type "
12060 "in enum %q#T", enumtype);
12061 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
12062 "previous definition here");
12063 underlying_type = NULL_TREE;
12067 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12068 || processing_template_decl)
12070 /* In case of error, make a dummy enum to allow parsing to
12072 if (enumtype == error_mark_node)
12074 name = make_anon_name ();
12075 enumtype = NULL_TREE;
12078 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12079 of an opaque enum, or an opaque enum of an already defined
12080 enumeration (C++0x only).
12081 In any other case, it'll be NULL_TREE. */
12087 prevtype = enumtype;
12089 /* Do not push the decl more than once, unless we need to
12090 compare underlying types at instantiation time */
12092 || TREE_CODE (enumtype) != ENUMERAL_TYPE
12093 || (underlying_type
12094 && dependent_type_p (underlying_type))
12095 || (ENUM_UNDERLYING_TYPE (enumtype)
12096 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12098 enumtype = cxx_make_type (ENUMERAL_TYPE);
12099 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12102 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12105 if (enumtype == error_mark_node)
12106 return error_mark_node;
12108 /* The enum is considered opaque until the opening '{' of the
12109 enumerator list. */
12110 SET_OPAQUE_ENUM_P (enumtype, true);
12111 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12114 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12116 if (underlying_type)
12118 if (CP_INTEGRAL_TYPE_P (underlying_type))
12120 copy_type_enum (enumtype, underlying_type);
12121 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12123 else if (dependent_type_p (underlying_type))
12124 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12126 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12127 underlying_type, enumtype);
12130 /* If into a template class, the returned enum is always the first
12131 declaration (opaque or not) seen. This way all the references to
12132 this type will be to the same declaration. The following ones are used
12133 only to check for definition errors. */
12134 if (prevtype && processing_template_decl)
12140 /* After processing and defining all the values of an enumeration type,
12141 install their decls in the enumeration type.
12142 ENUMTYPE is the type object. */
12145 finish_enum_value_list (tree enumtype)
12148 tree underlying_type;
12151 tree minnode, maxnode;
12154 bool fixed_underlying_type_p
12155 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12157 /* We built up the VALUES in reverse order. */
12158 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12160 /* For an enum defined in a template, just set the type of the values;
12161 all further processing is postponed until the template is
12162 instantiated. We need to set the type so that tsubst of a CONST_DECL
12164 if (processing_template_decl)
12166 for (values = TYPE_VALUES (enumtype);
12168 values = TREE_CHAIN (values))
12169 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12173 /* Determine the minimum and maximum values of the enumerators. */
12174 if (TYPE_VALUES (enumtype))
12176 minnode = maxnode = NULL_TREE;
12178 for (values = TYPE_VALUES (enumtype);
12180 values = TREE_CHAIN (values))
12182 decl = TREE_VALUE (values);
12184 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12185 each enumerator has the type of its enumeration. Prior to the
12186 closing brace, the type of each enumerator is the type of its
12187 initializing value. */
12188 TREE_TYPE (decl) = enumtype;
12190 /* Update the minimum and maximum values, if appropriate. */
12191 value = DECL_INITIAL (decl);
12192 if (value == error_mark_node)
12193 value = integer_zero_node;
12194 /* Figure out what the minimum and maximum values of the
12195 enumerators are. */
12197 minnode = maxnode = value;
12198 else if (tree_int_cst_lt (maxnode, value))
12200 else if (tree_int_cst_lt (value, minnode))
12207 If the enumerator-list is empty, the underlying type is as if
12208 the enumeration had a single enumerator with value 0. */
12209 minnode = maxnode = integer_zero_node;
12211 if (!fixed_underlying_type_p)
12213 /* Compute the number of bits require to represent all values of the
12214 enumeration. We must do this before the type of MINNODE and
12215 MAXNODE are transformed, since tree_int_cst_min_precision relies
12216 on the TREE_TYPE of the value it is passed. */
12217 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12218 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12219 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12220 int precision = MAX (lowprec, highprec);
12222 bool use_short_enum;
12224 /* Determine the underlying type of the enumeration.
12228 The underlying type of an enumeration is an integral type that
12229 can represent all the enumerator values defined in the
12230 enumeration. It is implementation-defined which integral type is
12231 used as the underlying type for an enumeration except that the
12232 underlying type shall not be larger than int unless the value of
12233 an enumerator cannot fit in an int or unsigned int.
12235 We use "int" or an "unsigned int" as the underlying type, even if
12236 a smaller integral type would work, unless the user has
12237 explicitly requested that we use the smallest possible type. The
12238 user can request that for all enumerations with a command line
12239 flag, or for just one enumeration with an attribute. */
12241 use_short_enum = flag_short_enums
12242 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12244 for (itk = (use_short_enum ? itk_char : itk_int);
12248 underlying_type = integer_types[itk];
12249 if (underlying_type != NULL_TREE
12250 && TYPE_PRECISION (underlying_type) >= precision
12251 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12254 if (itk == itk_none)
12258 IF no integral type can represent all the enumerator values, the
12259 enumeration is ill-formed. */
12260 error ("no integral type can represent all of the enumerator values "
12261 "for %qT", enumtype);
12262 precision = TYPE_PRECISION (long_long_integer_type_node);
12263 underlying_type = integer_types[itk_unsigned_long_long];
12268 The value of sizeof() applied to an enumeration type, an object
12269 of an enumeration type, or an enumerator, is the value of sizeof()
12270 applied to the underlying type. */
12271 copy_type_enum (enumtype, underlying_type);
12273 /* Compute the minimum and maximum values for the type.
12277 For an enumeration where emin is the smallest enumerator and emax
12278 is the largest, the values of the enumeration are the values of the
12279 underlying type in the range bmin to bmax, where bmin and bmax are,
12280 respectively, the smallest and largest values of the smallest bit-
12281 field that can store emin and emax. */
12283 /* The middle-end currently assumes that types with TYPE_PRECISION
12284 narrower than their underlying type are suitably zero or sign
12285 extended to fill their mode. Similarly, it assumes that the front
12286 end assures that a value of a particular type must be within
12287 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12289 We used to set these fields based on bmin and bmax, but that led
12290 to invalid assumptions like optimizing away bounds checking. So
12291 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12292 TYPE_MAX_VALUE to the values for the mode above and only restrict
12293 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12294 ENUM_UNDERLYING_TYPE (enumtype)
12295 = build_distinct_type_copy (underlying_type);
12296 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12297 set_min_and_max_values_for_integral_type
12298 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12300 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12301 if (flag_strict_enums)
12302 set_min_and_max_values_for_integral_type (enumtype, precision,
12306 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12308 /* Convert each of the enumerators to the type of the underlying
12309 type of the enumeration. */
12310 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12312 location_t saved_location;
12314 decl = TREE_VALUE (values);
12315 saved_location = input_location;
12316 input_location = DECL_SOURCE_LOCATION (decl);
12317 if (fixed_underlying_type_p)
12318 /* If the enumeration type has a fixed underlying type, we
12319 already checked all of the enumerator values. */
12320 value = DECL_INITIAL (decl);
12322 value = perform_implicit_conversion (underlying_type,
12323 DECL_INITIAL (decl),
12324 tf_warning_or_error);
12325 input_location = saved_location;
12327 /* Do not clobber shared ints. */
12328 value = copy_node (value);
12330 TREE_TYPE (value) = enumtype;
12331 DECL_INITIAL (decl) = value;
12334 /* Fix up all variant types of this enum type. */
12335 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12336 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12338 /* Finish debugging output for this type. */
12339 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12342 /* Finishes the enum type. This is called only the first time an
12343 enumeration is seen, be it opaque or odinary.
12344 ENUMTYPE is the type object. */
12347 finish_enum (tree enumtype)
12349 if (processing_template_decl)
12351 if (at_function_scope_p ())
12352 add_stmt (build_min (TAG_DEFN, enumtype));
12356 /* If this is a forward declaration, there should not be any variants,
12357 though we can get a variant in the middle of an enum-specifier with
12358 wacky code like 'enum E { e = sizeof(const E*) };' */
12359 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12360 && (TYPE_VALUES (enumtype)
12361 || !TYPE_NEXT_VARIANT (enumtype)));
12364 /* Build and install a CONST_DECL for an enumeration constant of the
12365 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12366 LOC is the location of NAME.
12367 Assignment of sequential values by default is handled here. */
12370 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12376 /* If the VALUE was erroneous, pretend it wasn't there; that will
12377 result in the enum being assigned the next value in sequence. */
12378 if (value == error_mark_node)
12381 /* Remove no-op casts from the value. */
12383 STRIP_TYPE_NOPS (value);
12385 if (! processing_template_decl)
12387 /* Validate and default VALUE. */
12388 if (value != NULL_TREE)
12390 value = cxx_constant_value (value);
12392 if (TREE_CODE (value) != INTEGER_CST
12393 || ! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12395 error ("enumerator value for %qD is not an integer constant",
12401 /* Default based on previous value. */
12402 if (value == NULL_TREE)
12404 if (TYPE_VALUES (enumtype))
12407 unsigned HOST_WIDE_INT lo;
12411 /* C++03 7.2/4: If no initializer is specified for the first
12412 enumerator, the type is an unspecified integral
12413 type. Otherwise the type is the same as the type of the
12414 initializing value of the preceding enumerator unless the
12415 incremented value is not representable in that type, in
12416 which case the type is an unspecified integral type
12417 sufficient to contain the incremented value. */
12418 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12419 if (error_operand_p (prev_value))
12420 value = error_mark_node;
12423 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12424 TREE_INT_CST_HIGH (prev_value),
12429 tree type = TREE_TYPE (prev_value);
12430 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12431 di.low = lo; di.high = hi;
12432 if (!double_int_fits_to_tree_p (type, di))
12435 for (itk = itk_int; itk != itk_none; itk++)
12437 type = integer_types[itk];
12438 if (type != NULL_TREE
12439 && (pos || !TYPE_UNSIGNED (type))
12440 && double_int_fits_to_tree_p (type, di))
12443 if (type && cxx_dialect < cxx0x
12444 && itk > itk_unsigned_long)
12445 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12446 incremented enumerator value is too large for %<unsigned long%>" : "\
12447 incremented enumerator value is too large for %<long%>");
12449 if (type == NULL_TREE)
12452 value = double_int_to_tree (type, di);
12457 error ("overflow in enumeration values at %qD", name);
12458 value = error_mark_node;
12463 value = integer_zero_node;
12466 /* Remove no-op casts from the value. */
12467 STRIP_TYPE_NOPS (value);
12469 /* If the underlying type of the enum is fixed, check whether
12470 the enumerator values fits in the underlying type. If it
12471 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12472 if (ENUM_UNDERLYING_TYPE (enumtype)
12474 && TREE_CODE (value) == INTEGER_CST
12475 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12477 error ("enumerator value %E is too large for underlying type %<%T%>",
12478 value, ENUM_UNDERLYING_TYPE (enumtype));
12480 /* Silently convert the value so that we can continue. */
12481 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12486 /* C++ associates enums with global, function, or class declarations. */
12487 context = current_scope ();
12489 /* Build the actual enumeration constant. Note that the enumeration
12490 constants have the underlying type of the enum (if it is fixed)
12491 or the type of their initializer (if the underlying type of the
12492 enum is not fixed):
12496 If the underlying type is fixed, the type of each enumerator
12497 prior to the closing brace is the underlying type; if the
12498 initializing value of an enumerator cannot be represented by
12499 the underlying type, the program is ill-formed. If the
12500 underlying type is not fixed, the type of each enumerator is
12501 the type of its initializing value.
12503 If the underlying type is not fixed, it will be computed by
12504 finish_enum and we will reset the type of this enumerator. Of
12505 course, if we're processing a template, there may be no value. */
12506 type = value ? TREE_TYPE (value) : NULL_TREE;
12508 if (context && context == current_class_type)
12509 /* This enum declaration is local to the class. We need the full
12510 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12511 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12513 /* It's a global enum, or it's local to a function. (Note local to
12514 a function could mean local to a class method. */
12515 decl = build_decl (loc, CONST_DECL, name, type);
12517 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12518 TREE_CONSTANT (decl) = 1;
12519 TREE_READONLY (decl) = 1;
12520 DECL_INITIAL (decl) = value;
12522 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12523 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12524 on the TYPE_FIELDS list for `S'. (That's so that you can say
12525 things like `S::i' later.) */
12526 finish_member_declaration (decl);
12530 /* Add this enumeration constant to the list for this type. */
12531 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12534 /* Look for an enumerator with the given NAME within the enumeration
12535 type ENUMTYPE. This routine is used primarily for qualified name
12536 lookup into an enumerator in C++0x, e.g.,
12538 enum class Color { Red, Green, Blue };
12540 Color color = Color::Red;
12542 Returns the value corresponding to the enumerator, or
12543 NULL_TREE if no such enumerator was found. */
12545 lookup_enumerator (tree enumtype, tree name)
12548 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12550 e = purpose_member (name, TYPE_VALUES (enumtype));
12551 return e? TREE_VALUE (e) : NULL_TREE;
12555 /* We're defining DECL. Make sure that its type is OK. */
12558 check_function_type (tree decl, tree current_function_parms)
12560 tree fntype = TREE_TYPE (decl);
12561 tree return_type = complete_type (TREE_TYPE (fntype));
12563 /* In a function definition, arg types must be complete. */
12564 require_complete_types_for_parms (current_function_parms);
12566 if (dependent_type_p (return_type))
12568 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12569 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12571 tree args = TYPE_ARG_TYPES (fntype);
12573 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12574 error ("return type %q#T is incomplete", return_type);
12576 error ("return type has Java class type %q#T", return_type);
12578 /* Make it return void instead. */
12579 if (TREE_CODE (fntype) == METHOD_TYPE)
12580 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12582 TREE_CHAIN (args));
12584 fntype = build_function_type (void_type_node, args);
12586 = build_exception_variant (fntype,
12587 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12588 fntype = (cp_build_type_attribute_variant
12589 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12590 TREE_TYPE (decl) = fntype;
12593 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12596 /* Create the FUNCTION_DECL for a function definition.
12597 DECLSPECS and DECLARATOR are the parts of the declaration;
12598 they describe the function's name and the type it returns,
12599 but twisted together in a fashion that parallels the syntax of C.
12601 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12602 DECLARATOR is really the DECL for the function we are about to
12603 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12604 indicating that the function is an inline defined in-class.
12606 This function creates a binding context for the function body
12607 as well as setting up the FUNCTION_DECL in current_function_decl.
12609 For C++, we must first check whether that datum makes any sense.
12610 For example, "class A local_a(1,2);" means that variable local_a
12611 is an aggregate of type A, which should have a constructor
12612 applied to it with the argument list [1, 2].
12614 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12615 or may be a BLOCK if the function has been defined previously
12616 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12617 error_mark_node if the function has never been defined, or
12618 a BLOCK if the function has been defined somewhere. */
12621 start_preparsed_function (tree decl1, tree attrs, int flags)
12623 tree ctype = NULL_TREE;
12626 int doing_friend = 0;
12627 cp_binding_level *bl;
12628 tree current_function_parms;
12629 struct c_fileinfo *finfo
12630 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12631 bool honor_interface;
12633 /* Sanity check. */
12634 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12635 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12637 fntype = TREE_TYPE (decl1);
12638 if (TREE_CODE (fntype) == METHOD_TYPE)
12639 ctype = TYPE_METHOD_BASETYPE (fntype);
12641 /* ISO C++ 11.4/5. A friend function defined in a class is in
12642 the (lexical) scope of the class in which it is defined. */
12643 if (!ctype && DECL_FRIEND_P (decl1))
12645 ctype = DECL_FRIEND_CONTEXT (decl1);
12647 /* CTYPE could be null here if we're dealing with a template;
12648 for example, `inline friend float foo()' inside a template
12649 will have no CTYPE set. */
12650 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12656 if (DECL_DECLARED_INLINE_P (decl1)
12657 && lookup_attribute ("noinline", attrs))
12658 warning (0, "inline function %q+D given attribute noinline", decl1);
12660 /* Handle gnu_inline attribute. */
12661 if (GNU_INLINE_P (decl1))
12663 DECL_EXTERNAL (decl1) = 1;
12664 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12665 DECL_INTERFACE_KNOWN (decl1) = 1;
12666 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12669 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12670 /* This is a constructor, we must ensure that any default args
12671 introduced by this definition are propagated to the clones
12672 now. The clones are used directly in overload resolution. */
12673 adjust_clone_args (decl1);
12675 /* Sometimes we don't notice that a function is a static member, and
12676 build a METHOD_TYPE for it. Fix that up now. */
12677 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12678 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12680 /* Set up current_class_type, and enter the scope of the class, if
12683 push_nested_class (ctype);
12684 else if (DECL_STATIC_FUNCTION_P (decl1))
12685 push_nested_class (DECL_CONTEXT (decl1));
12687 /* Now that we have entered the scope of the class, we must restore
12688 the bindings for any template parameters surrounding DECL1, if it
12689 is an inline member template. (Order is important; consider the
12690 case where a template parameter has the same name as a field of
12691 the class.) It is not until after this point that
12692 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12693 if (flags & SF_INCLASS_INLINE)
12694 maybe_begin_member_template_processing (decl1);
12696 /* Effective C++ rule 15. */
12698 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12699 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12700 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12702 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12703 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12704 if (!DECL_INITIAL (decl1))
12705 DECL_INITIAL (decl1) = error_mark_node;
12707 /* This function exists in static storage.
12708 (This does not mean `static' in the C sense!) */
12709 TREE_STATIC (decl1) = 1;
12711 /* We must call push_template_decl after current_class_type is set
12712 up. (If we are processing inline definitions after exiting a
12713 class scope, current_class_type will be NULL_TREE until set above
12714 by push_nested_class.) */
12715 if (processing_template_decl)
12717 /* FIXME: Handle error_mark_node more gracefully. */
12718 tree newdecl1 = push_template_decl (decl1);
12719 if (newdecl1 != error_mark_node)
12723 /* We are now in the scope of the function being defined. */
12724 current_function_decl = decl1;
12726 /* Save the parm names or decls from this function's declarator
12727 where store_parm_decls will find them. */
12728 current_function_parms = DECL_ARGUMENTS (decl1);
12730 /* Make sure the parameter and return types are reasonable. When
12731 you declare a function, these types can be incomplete, but they
12732 must be complete when you define the function. */
12733 check_function_type (decl1, current_function_parms);
12735 /* Build the return declaration for the function. */
12736 restype = TREE_TYPE (fntype);
12737 if (DECL_RESULT (decl1) == NULL_TREE)
12741 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12742 DECL_ARTIFICIAL (resdecl) = 1;
12743 DECL_IGNORED_P (resdecl) = 1;
12744 DECL_RESULT (decl1) = resdecl;
12746 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12749 /* Let the user know we're compiling this function. */
12750 announce_function (decl1);
12752 /* Record the decl so that the function name is defined.
12753 If we already have a decl for this name, and it is a FUNCTION_DECL,
12754 use the old decl. */
12755 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12757 /* A specialization is not used to guide overload resolution. */
12758 if (!DECL_FUNCTION_MEMBER_P (decl1)
12759 && !(DECL_USE_TEMPLATE (decl1) &&
12760 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12762 tree olddecl = pushdecl (decl1);
12764 if (olddecl == error_mark_node)
12765 /* If something went wrong when registering the declaration,
12766 use DECL1; we have to have a FUNCTION_DECL to use when
12767 parsing the body of the function. */
12771 /* Otherwise, OLDDECL is either a previous declaration
12772 of the same function or DECL1 itself. */
12774 if (warn_missing_declarations
12775 && olddecl == decl1
12776 && !DECL_MAIN_P (decl1)
12777 && TREE_PUBLIC (decl1)
12778 && !DECL_DECLARED_INLINE_P (decl1))
12782 /* Check whether DECL1 is in an anonymous
12784 for (context = DECL_CONTEXT (decl1);
12786 context = DECL_CONTEXT (context))
12788 if (TREE_CODE (context) == NAMESPACE_DECL
12789 && DECL_NAME (context) == NULL_TREE)
12793 if (context == NULL)
12794 warning (OPT_Wmissing_declarations,
12795 "no previous declaration for %q+D", decl1);
12803 /* We need to set the DECL_CONTEXT. */
12804 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12805 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12807 fntype = TREE_TYPE (decl1);
12809 /* If #pragma weak applies, mark the decl appropriately now.
12810 The pragma only applies to global functions. Because
12811 determining whether or not the #pragma applies involves
12812 computing the mangled name for the declaration, we cannot
12813 apply the pragma until after we have merged this declaration
12814 with any previous declarations; if the original declaration
12815 has a linkage specification, that specification applies to
12816 the definition as well, and may affect the mangled name. */
12817 if (DECL_FILE_SCOPE_P (decl1))
12818 maybe_apply_pragma_weak (decl1);
12821 /* Reset this in case the call to pushdecl changed it. */
12822 current_function_decl = decl1;
12824 gcc_assert (DECL_INITIAL (decl1));
12826 /* This function may already have been parsed, in which case just
12827 return; our caller will skip over the body without parsing. */
12828 if (DECL_INITIAL (decl1) != error_mark_node)
12831 /* Initialize RTL machinery. We cannot do this until
12832 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12833 even when processing a template; this is how we get
12834 CFUN set up, and our per-function variables initialized.
12835 FIXME factor out the non-RTL stuff. */
12836 bl = current_binding_level;
12837 allocate_struct_function (decl1, processing_template_decl);
12839 /* Initialize the language data structures. Whenever we start
12840 a new function, we destroy temporaries in the usual way. */
12841 cfun->language = ggc_alloc_cleared_language_function ();
12842 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12843 current_binding_level = bl;
12845 /* Start the statement-tree, start the tree now. */
12846 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12848 /* If we are (erroneously) defining a function that we have already
12849 defined before, wipe out what we knew before. */
12850 if (!DECL_PENDING_INLINE_P (decl1))
12851 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12853 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12855 /* We know that this was set up by `grokclassfn'. We do not
12856 wait until `store_parm_decls', since evil parse errors may
12857 never get us to that point. Here we keep the consistency
12858 between `current_class_type' and `current_class_ptr'. */
12859 tree t = DECL_ARGUMENTS (decl1);
12861 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12862 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12864 cp_function_chain->x_current_class_ref
12865 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12866 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12867 cp_function_chain->x_current_class_ptr = t;
12869 /* Constructors and destructors need to know whether they're "in
12870 charge" of initializing virtual base classes. */
12871 t = DECL_CHAIN (t);
12872 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12874 current_in_charge_parm = t;
12875 t = DECL_CHAIN (t);
12877 if (DECL_HAS_VTT_PARM_P (decl1))
12879 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12880 current_vtt_parm = t;
12884 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12885 /* Implicitly-defined methods (like the
12886 destructor for a class in which no destructor
12887 is explicitly declared) must not be defined
12888 until their definition is needed. So, we
12889 ignore interface specifications for
12890 compiler-generated functions. */
12891 && !DECL_ARTIFICIAL (decl1));
12893 if (processing_template_decl)
12894 /* Don't mess with interface flags. */;
12895 else if (DECL_INTERFACE_KNOWN (decl1))
12897 tree ctx = decl_function_context (decl1);
12899 if (DECL_NOT_REALLY_EXTERN (decl1))
12900 DECL_EXTERNAL (decl1) = 0;
12902 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12903 && TREE_PUBLIC (ctx))
12904 /* This is a function in a local class in an extern inline
12906 comdat_linkage (decl1);
12908 /* If this function belongs to an interface, it is public.
12909 If it belongs to someone else's interface, it is also external.
12910 This only affects inlines and template instantiations. */
12911 else if (!finfo->interface_unknown && honor_interface)
12913 if (DECL_DECLARED_INLINE_P (decl1)
12914 || DECL_TEMPLATE_INSTANTIATION (decl1))
12916 DECL_EXTERNAL (decl1)
12917 = (finfo->interface_only
12918 || (DECL_DECLARED_INLINE_P (decl1)
12919 && ! flag_implement_inlines
12920 && !DECL_VINDEX (decl1)));
12922 /* For WIN32 we also want to put these in linkonce sections. */
12923 maybe_make_one_only (decl1);
12926 DECL_EXTERNAL (decl1) = 0;
12927 DECL_INTERFACE_KNOWN (decl1) = 1;
12928 /* If this function is in an interface implemented in this file,
12929 make sure that the back end knows to emit this function
12931 if (!DECL_EXTERNAL (decl1))
12932 mark_needed (decl1);
12934 else if (finfo->interface_unknown && finfo->interface_only
12935 && honor_interface)
12937 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12938 interface, we will have both finfo->interface_unknown and
12939 finfo->interface_only set. In that case, we don't want to
12940 use the normal heuristics because someone will supply a
12941 #pragma implementation elsewhere, and deducing it here would
12942 produce a conflict. */
12943 comdat_linkage (decl1);
12944 DECL_EXTERNAL (decl1) = 0;
12945 DECL_INTERFACE_KNOWN (decl1) = 1;
12946 DECL_DEFER_OUTPUT (decl1) = 1;
12950 /* This is a definition, not a reference.
12951 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12952 if (!GNU_INLINE_P (decl1))
12953 DECL_EXTERNAL (decl1) = 0;
12955 if ((DECL_DECLARED_INLINE_P (decl1)
12956 || DECL_TEMPLATE_INSTANTIATION (decl1))
12957 && ! DECL_INTERFACE_KNOWN (decl1))
12958 DECL_DEFER_OUTPUT (decl1) = 1;
12960 DECL_INTERFACE_KNOWN (decl1) = 1;
12963 /* Determine the ELF visibility attribute for the function. We must not
12964 do this before calling "pushdecl", as we must allow "duplicate_decls"
12965 to merge any attributes appropriately. We also need to wait until
12967 if (!DECL_CLONED_FUNCTION_P (decl1))
12968 determine_visibility (decl1);
12970 begin_scope (sk_function_parms, decl1);
12974 if (DECL_DESTRUCTOR_P (decl1)
12975 || (DECL_CONSTRUCTOR_P (decl1)
12976 && targetm.cxx.cdtor_returns_this ()))
12978 cdtor_label = build_decl (input_location,
12979 LABEL_DECL, NULL_TREE, NULL_TREE);
12980 DECL_CONTEXT (cdtor_label) = current_function_decl;
12983 start_fname_decls ();
12985 store_parm_decls (current_function_parms);
12989 /* Like start_preparsed_function, except that instead of a
12990 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12992 Returns 1 on success. If the DECLARATOR is not suitable for a function
12993 (it defines a datum instead), we return 0, which tells
12994 yyparse to report a parse error. */
12997 start_function (cp_decl_specifier_seq *declspecs,
12998 const cp_declarator *declarator,
13003 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
13004 if (decl1 == error_mark_node)
13006 /* If the declarator is not suitable for a function definition,
13007 cause a syntax error. */
13008 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
13010 error ("invalid function declaration");
13014 if (DECL_MAIN_P (decl1))
13015 /* main must return int. grokfndecl should have corrected it
13016 (and issued a diagnostic) if the user got it wrong. */
13017 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
13018 integer_type_node));
13020 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
13025 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
13029 use_eh_spec_block (tree fn)
13031 return (flag_exceptions && flag_enforce_eh_specs
13032 && !processing_template_decl
13033 && !type_throw_all_p (TREE_TYPE (fn))
13034 /* We insert the EH_SPEC_BLOCK only in the original
13035 function; then, it is copied automatically to the
13037 && !DECL_CLONED_FUNCTION_P (fn)
13038 /* Implicitly-generated constructors and destructors have
13039 exception specifications. However, those specifications
13040 are the union of the possible exceptions specified by the
13041 constructors/destructors for bases and members, so no
13042 unallowed exception will ever reach this function. By
13043 not creating the EH_SPEC_BLOCK we save a little memory,
13044 and we avoid spurious warnings about unreachable
13046 && !DECL_DEFAULTED_FN (fn));
13049 /* Store the parameter declarations into the current function declaration.
13050 This is called after parsing the parameter declarations, before
13051 digesting the body of the function.
13053 Also install to binding contour return value identifier, if any. */
13056 store_parm_decls (tree current_function_parms)
13058 tree fndecl = current_function_decl;
13061 /* This is a chain of any other decls that came in among the parm
13062 declarations. If a parm is declared with enum {foo, bar} x;
13063 then CONST_DECLs for foo and bar are put here. */
13064 tree nonparms = NULL_TREE;
13066 if (current_function_parms)
13068 /* This case is when the function was defined with an ANSI prototype.
13069 The parms already have decls, so we need not do anything here
13070 except record them as in effect
13071 and complain if any redundant old-style parm decls were written. */
13073 tree specparms = current_function_parms;
13076 /* Must clear this because it might contain TYPE_DECLs declared
13078 current_binding_level->names = NULL;
13080 /* If we're doing semantic analysis, then we'll call pushdecl
13081 for each of these. We must do them in reverse order so that
13082 they end in the correct forward order. */
13083 specparms = nreverse (specparms);
13085 for (parm = specparms; parm; parm = next)
13087 next = DECL_CHAIN (parm);
13088 if (TREE_CODE (parm) == PARM_DECL)
13090 if (DECL_NAME (parm) == NULL_TREE
13091 || TREE_CODE (parm) != VOID_TYPE)
13094 error ("parameter %qD declared void", parm);
13098 /* If we find an enum constant or a type tag,
13099 put it aside for the moment. */
13100 TREE_CHAIN (parm) = NULL_TREE;
13101 nonparms = chainon (nonparms, parm);
13105 /* Get the decls in their original chain order and record in the
13106 function. This is all and only the PARM_DECLs that were
13107 pushed into scope by the loop above. */
13108 DECL_ARGUMENTS (fndecl) = getdecls ();
13111 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13113 /* Now store the final chain of decls for the arguments
13114 as the decl-chain of the current lexical scope.
13115 Put the enumerators in as well, at the front so that
13116 DECL_ARGUMENTS is not modified. */
13117 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13119 if (use_eh_spec_block (current_function_decl))
13120 current_eh_spec_block = begin_eh_spec_block ();
13124 /* We have finished doing semantic analysis on DECL, but have not yet
13125 generated RTL for its body. Save away our current state, so that
13126 when we want to generate RTL later we know what to do. */
13129 save_function_data (tree decl)
13131 struct language_function *f;
13133 /* Save the language-specific per-function data so that we can
13134 get it back when we really expand this function. */
13135 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13138 f = ggc_alloc_language_function ();
13139 memcpy (f, cp_function_chain, sizeof (struct language_function));
13140 DECL_SAVED_FUNCTION_DATA (decl) = f;
13142 /* Clear out the bits we don't need. */
13143 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13144 f->bindings = NULL;
13145 f->x_local_names = NULL;
13146 f->base.local_typedefs = NULL;
13150 /* Set the return value of the constructor (if present). */
13153 finish_constructor_body (void)
13158 if (targetm.cxx.cdtor_returns_this ()
13159 && (! TYPE_FOR_JAVA (current_class_type)))
13161 /* Any return from a constructor will end up here. */
13162 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13164 val = DECL_ARGUMENTS (current_function_decl);
13165 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13166 DECL_RESULT (current_function_decl), val);
13167 /* Return the address of the object. */
13168 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13169 add_stmt (exprstmt);
13173 /* Do all the processing for the beginning of a destructor; set up the
13174 vtable pointers and cleanups for bases and members. */
13177 begin_destructor_body (void)
13179 tree compound_stmt;
13181 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13182 issued an error message. We still want to try to process the
13183 body of the function, but initialize_vtbl_ptrs will crash if
13184 TYPE_BINFO is NULL. */
13185 if (COMPLETE_TYPE_P (current_class_type))
13187 compound_stmt = begin_compound_stmt (0);
13188 /* Make all virtual function table pointers in non-virtual base
13189 classes point to CURRENT_CLASS_TYPE's virtual function
13191 initialize_vtbl_ptrs (current_class_ptr);
13192 finish_compound_stmt (compound_stmt);
13194 /* And insert cleanups for our bases and members so that they
13195 will be properly destroyed if we throw. */
13196 push_base_cleanups ();
13200 /* At the end of every destructor we generate code to delete the object if
13201 necessary. Do that now. */
13204 finish_destructor_body (void)
13208 /* Any return from a destructor will end up here; that way all base
13209 and member cleanups will be run when the function returns. */
13210 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13212 /* In a virtual destructor, we must call delete. */
13213 if (DECL_VIRTUAL_P (current_function_decl))
13216 tree virtual_size = cxx_sizeof (current_class_type);
13220 At the point of definition of a virtual destructor (including
13221 an implicit definition), non-placement operator delete shall
13222 be looked up in the scope of the destructor's class and if
13223 found shall be accessible and unambiguous. */
13224 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13226 /*global_p=*/false,
13227 /*placement=*/NULL_TREE,
13228 /*alloc_fn=*/NULL_TREE);
13230 if_stmt = begin_if_stmt ();
13231 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13232 current_in_charge_parm,
13235 finish_expr_stmt (exprstmt);
13236 finish_then_clause (if_stmt);
13237 finish_if_stmt (if_stmt);
13240 if (targetm.cxx.cdtor_returns_this ())
13244 val = DECL_ARGUMENTS (current_function_decl);
13245 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13246 DECL_RESULT (current_function_decl), val);
13247 /* Return the address of the object. */
13248 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13249 add_stmt (exprstmt);
13253 /* Do the necessary processing for the beginning of a function body, which
13254 in this case includes member-initializers, but not the catch clauses of
13255 a function-try-block. Currently, this means opening a binding level
13256 for the member-initializers (in a ctor), member cleanups (in a dtor),
13257 and capture proxies (in a lambda operator()). */
13260 begin_function_body (void)
13264 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13267 if (processing_template_decl)
13268 /* Do nothing now. */;
13270 /* Always keep the BLOCK node associated with the outermost pair of
13271 curly braces of a function. These are needed for correct
13272 operation of dwarfout.c. */
13273 keep_next_level (true);
13275 stmt = begin_compound_stmt (BCS_FN_BODY);
13277 if (processing_template_decl)
13278 /* Do nothing now. */;
13279 else if (DECL_DESTRUCTOR_P (current_function_decl))
13280 begin_destructor_body ();
13285 /* Do the processing for the end of a function body. Currently, this means
13286 closing out the cleanups for fully-constructed bases and members, and in
13287 the case of the destructor, deleting the object if desired. Again, this
13288 is only meaningful for [cd]tors, since they are the only functions where
13289 there is a significant distinction between the main body and any
13290 function catch clauses. Handling, say, main() return semantics here
13291 would be wrong, as flowing off the end of a function catch clause for
13292 main() would also need to return 0. */
13295 finish_function_body (tree compstmt)
13297 if (compstmt == NULL_TREE)
13300 /* Close the block. */
13301 finish_compound_stmt (compstmt);
13303 if (processing_template_decl)
13304 /* Do nothing now. */;
13305 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13306 finish_constructor_body ();
13307 else if (DECL_DESTRUCTOR_P (current_function_decl))
13308 finish_destructor_body ();
13311 /* Given a function, returns the BLOCK corresponding to the outermost level
13312 of curly braces, skipping the artificial block created for constructor
13316 outer_curly_brace_block (tree fndecl)
13318 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13319 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13320 /* Skip the artificial function body block. */
13321 block = BLOCK_SUBBLOCKS (block);
13325 /* If FNDECL is a class's key method, add the class to the list of
13326 keyed classes that should be emitted. */
13329 record_key_method_defined (tree fndecl)
13331 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13332 && DECL_VIRTUAL_P (fndecl)
13333 && !processing_template_decl)
13335 tree fnclass = DECL_CONTEXT (fndecl);
13336 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13337 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13341 /* Subroutine of finish_function.
13342 Save the body of constexpr functions for possible
13343 future compile time evaluation. */
13346 maybe_save_function_definition (tree fun)
13348 if (!processing_template_decl
13349 && DECL_DECLARED_CONSTEXPR_P (fun)
13350 && !DECL_CLONED_FUNCTION_P (fun))
13351 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13354 /* Finish up a function declaration and compile that function
13355 all the way to assembler language output. The free the storage
13356 for the function definition.
13358 FLAGS is a bitwise or of the following values:
13360 We just finished processing the body of an in-class inline
13361 function definition. (This processing will have taken place
13362 after the class definition is complete.) */
13365 finish_function (int flags)
13367 tree fndecl = current_function_decl;
13368 tree fntype, ctype = NULL_TREE;
13369 int inclass_inline = (flags & 2) != 0;
13371 /* When we get some parse errors, we can end up without a
13372 current_function_decl, so cope. */
13373 if (fndecl == NULL_TREE)
13374 return error_mark_node;
13376 if (c_dialect_objc ())
13377 objc_finish_function ();
13379 gcc_assert (!defer_mark_used_calls);
13380 defer_mark_used_calls = true;
13382 record_key_method_defined (fndecl);
13384 fntype = TREE_TYPE (fndecl);
13386 /* TREE_READONLY (fndecl) = 1;
13387 This caused &foo to be of type ptr-to-const-function
13388 which then got a warning when stored in a ptr-to-function variable. */
13390 gcc_assert (building_stmt_list_p ());
13391 /* The current function is being defined, so its DECL_INITIAL should
13392 be set, and unless there's a multiple definition, it should be
13393 error_mark_node. */
13394 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13396 /* For a cloned function, we've already got all the code we need;
13397 there's no need to add any extra bits. */
13398 if (!DECL_CLONED_FUNCTION_P (fndecl))
13400 if (DECL_MAIN_P (current_function_decl))
13402 /* Make it so that `main' always returns 0 by default (or
13405 finish_return_stmt (integer_one_node);
13407 finish_return_stmt (integer_zero_node);
13411 if (use_eh_spec_block (current_function_decl))
13412 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13413 (TREE_TYPE (current_function_decl)),
13414 current_eh_spec_block);
13417 /* If we're saving up tree structure, tie off the function now. */
13418 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13420 finish_fname_decls ();
13422 /* If this function can't throw any exceptions, remember that. */
13423 if (!processing_template_decl
13424 && !cp_function_chain->can_throw
13425 && !flag_non_call_exceptions
13426 && !decl_replaceable_p (fndecl))
13427 TREE_NOTHROW (fndecl) = 1;
13429 /* This must come after expand_function_end because cleanups might
13430 have declarations (from inline functions) that need to go into
13431 this function's blocks. */
13433 /* If the current binding level isn't the outermost binding level
13434 for this function, either there is a bug, or we have experienced
13435 syntax errors and the statement tree is malformed. */
13436 if (current_binding_level->kind != sk_function_parms)
13438 /* Make sure we have already experienced errors. */
13439 gcc_assert (errorcount);
13441 /* Throw away the broken statement tree and extra binding
13443 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13445 while (current_binding_level->kind != sk_function_parms)
13447 if (current_binding_level->kind == sk_class)
13448 pop_nested_class ();
13450 poplevel (0, 0, 0);
13453 poplevel (1, 0, 1);
13455 /* Statements should always be full-expressions at the outermost set
13456 of curly braces for a function. */
13457 gcc_assert (stmts_are_full_exprs_p ());
13459 /* Save constexpr function body before it gets munged by
13460 the NRV transformation. */
13461 maybe_save_function_definition (fndecl);
13463 /* Set up the named return value optimization, if we can. Candidate
13464 variables are selected in check_return_expr. */
13465 if (current_function_return_value)
13467 tree r = current_function_return_value;
13470 if (r != error_mark_node
13471 /* This is only worth doing for fns that return in memory--and
13472 simpler, since we don't have to worry about promoted modes. */
13473 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13474 /* Only allow this for variables declared in the outer scope of
13475 the function so we know that their lifetime always ends with a
13476 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13477 we were to do this optimization in tree-ssa. */
13478 && (outer = outer_curly_brace_block (fndecl))
13479 && chain_member (r, BLOCK_VARS (outer)))
13480 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13482 current_function_return_value = NULL_TREE;
13485 /* Remember that we were in class scope. */
13486 if (current_class_name)
13487 ctype = current_class_type;
13489 /* Must mark the RESULT_DECL as being in this function. */
13490 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13492 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13493 to the FUNCTION_DECL node itself. */
13494 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13496 /* Save away current state, if appropriate. */
13497 if (!processing_template_decl)
13498 save_function_data (fndecl);
13500 /* Complain if there's just no return statement. */
13501 if (warn_return_type
13502 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13503 && !dependent_type_p (TREE_TYPE (fntype))
13504 && !current_function_returns_value && !current_function_returns_null
13505 /* Don't complain if we abort or throw. */
13506 && !current_function_returns_abnormally
13507 /* Don't complain if we are declared noreturn. */
13508 && !TREE_THIS_VOLATILE (fndecl)
13509 && !DECL_NAME (DECL_RESULT (fndecl))
13510 && !TREE_NO_WARNING (fndecl)
13511 /* Structor return values (if any) are set by the compiler. */
13512 && !DECL_CONSTRUCTOR_P (fndecl)
13513 && !DECL_DESTRUCTOR_P (fndecl))
13515 warning (OPT_Wreturn_type,
13516 "no return statement in function returning non-void");
13517 TREE_NO_WARNING (fndecl) = 1;
13520 /* Store the end of the function, so that we get good line number
13521 info for the epilogue. */
13522 cfun->function_end_locus = input_location;
13524 /* Complain about parameters that are only set, but never otherwise used. */
13525 if (warn_unused_but_set_parameter
13526 && !processing_template_decl
13527 && errorcount == unused_but_set_errorcount
13528 && !DECL_CLONED_FUNCTION_P (fndecl))
13532 for (decl = DECL_ARGUMENTS (fndecl);
13534 decl = DECL_CHAIN (decl))
13535 if (TREE_USED (decl)
13536 && TREE_CODE (decl) == PARM_DECL
13537 && !DECL_READ_P (decl)
13538 && DECL_NAME (decl)
13539 && !DECL_ARTIFICIAL (decl)
13540 && !TREE_NO_WARNING (decl)
13541 && !DECL_IN_SYSTEM_HEADER (decl)
13542 && TREE_TYPE (decl) != error_mark_node
13543 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13544 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13545 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13546 warning (OPT_Wunused_but_set_parameter,
13547 "parameter %q+D set but not used", decl);
13548 unused_but_set_errorcount = errorcount;
13551 /* Complain about locally defined typedefs that are not used in this
13553 maybe_warn_unused_local_typedefs ();
13555 /* Genericize before inlining. */
13556 if (!processing_template_decl)
13558 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13559 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13560 cp_genericize (fndecl);
13561 /* Clear out the bits we don't need. */
13562 f->x_current_class_ptr = NULL;
13563 f->x_current_class_ref = NULL;
13564 f->x_eh_spec_block = NULL;
13565 f->x_in_charge_parm = NULL;
13566 f->x_vtt_parm = NULL;
13567 f->x_return_value = NULL;
13568 f->bindings = NULL;
13569 f->extern_decl_map = NULL;
13571 /* Clear out the bits we don't need. */
13572 local_names = NULL;
13574 /* We're leaving the context of this function, so zap cfun. It's still in
13575 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13577 current_function_decl = NULL;
13579 /* If this is an in-class inline definition, we may have to pop the
13580 bindings for the template parameters that we added in
13581 maybe_begin_member_template_processing when start_function was
13583 if (inclass_inline)
13584 maybe_end_member_template_processing ();
13586 /* Leave the scope of the class. */
13588 pop_nested_class ();
13593 current_function_decl = NULL_TREE;
13595 defer_mark_used_calls = false;
13596 if (deferred_mark_used_calls)
13601 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13603 VEC_free (tree, gc, deferred_mark_used_calls);
13609 /* Create the FUNCTION_DECL for a function definition.
13610 DECLSPECS and DECLARATOR are the parts of the declaration;
13611 they describe the return type and the name of the function,
13612 but twisted together in a fashion that parallels the syntax of C.
13614 This function creates a binding context for the function body
13615 as well as setting up the FUNCTION_DECL in current_function_decl.
13617 Returns a FUNCTION_DECL on success.
13619 If the DECLARATOR is not suitable for a function (it defines a datum
13620 instead), we return 0, which tells yyparse to report a parse error.
13622 May return void_type_node indicating that this method is actually
13623 a friend. See grokfield for more details.
13625 Came here with a `.pushlevel' .
13627 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13628 CHANGES TO CODE IN `grokfield'. */
13631 grokmethod (cp_decl_specifier_seq *declspecs,
13632 const cp_declarator *declarator, tree attrlist)
13634 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13637 if (fndecl == error_mark_node)
13638 return error_mark_node;
13640 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13642 error ("invalid member function declaration");
13643 return error_mark_node;
13647 cplus_decl_attributes (&fndecl, attrlist, 0);
13649 /* Pass friends other than inline friend functions back. */
13650 if (fndecl == void_type_node)
13653 if (DECL_IN_AGGR_P (fndecl))
13655 if (DECL_CLASS_SCOPE_P (fndecl))
13656 error ("%qD is already defined in class %qT", fndecl,
13657 DECL_CONTEXT (fndecl));
13658 return error_mark_node;
13661 check_template_shadow (fndecl);
13663 DECL_DECLARED_INLINE_P (fndecl) = 1;
13664 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13666 /* We process method specializations in finish_struct_1. */
13667 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13669 fndecl = push_template_decl (fndecl);
13670 if (fndecl == error_mark_node)
13674 if (! DECL_FRIEND_P (fndecl))
13676 if (DECL_CHAIN (fndecl))
13678 fndecl = copy_node (fndecl);
13679 TREE_CHAIN (fndecl) = NULL_TREE;
13683 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13685 DECL_IN_AGGR_P (fndecl) = 1;
13690 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13691 we can lay it out later, when and if its type becomes complete. */
13694 maybe_register_incomplete_var (tree var)
13696 gcc_assert (TREE_CODE (var) == VAR_DECL);
13698 /* Keep track of variables with incomplete types. */
13699 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13700 && DECL_EXTERNAL (var))
13702 tree inner_type = TREE_TYPE (var);
13704 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13705 inner_type = TREE_TYPE (inner_type);
13706 inner_type = TYPE_MAIN_VARIANT (inner_type);
13708 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13709 /* RTTI TD entries are created while defining the type_info. */
13710 || (TYPE_LANG_SPECIFIC (inner_type)
13711 && TYPE_BEING_DEFINED (inner_type)))
13714 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13716 iv->incomplete_type = inner_type;
13721 /* Called when a class type (given by TYPE) is defined. If there are
13722 any existing VAR_DECLs whose type has been completed by this
13723 declaration, update them now. */
13726 complete_vars (tree type)
13729 incomplete_var *iv;
13731 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13733 if (same_type_p (type, iv->incomplete_type))
13735 tree var = iv->decl;
13736 tree type = TREE_TYPE (var);
13737 /* Complete the type of the variable. The VAR_DECL itself
13738 will be laid out in expand_expr. */
13739 complete_type (type);
13740 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13741 /* Remove this entry from the list. */
13742 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13748 /* Check for pending declarations which may have abstract type. */
13749 complete_type_check_abstract (type);
13752 /* If DECL is of a type which needs a cleanup, build and return an
13753 expression to perform that cleanup here. Return NULL_TREE if no
13754 cleanup need be done. */
13757 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13763 /* Assume no cleanup is required. */
13764 cleanup = NULL_TREE;
13766 if (error_operand_p (decl))
13769 /* Handle "__attribute__((cleanup))". We run the cleanup function
13770 before the destructor since the destructor is what actually
13771 terminates the lifetime of the object. */
13772 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13779 /* Get the name specified by the user for the cleanup function. */
13780 id = TREE_VALUE (TREE_VALUE (attr));
13781 /* Look up the name to find the cleanup function to call. It is
13782 important to use lookup_name here because that is what is
13783 used in c-common.c:handle_cleanup_attribute when performing
13784 initial checks on the attribute. Note that those checks
13785 include ensuring that the function found is not an overloaded
13786 function, or an object with an overloaded call operator,
13787 etc.; we can rely on the fact that the function found is an
13788 ordinary FUNCTION_DECL. */
13789 fn = lookup_name (id);
13790 arg = build_address (decl);
13792 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13793 if (cleanup == error_mark_node)
13794 return error_mark_node;
13796 /* Handle ordinary C++ destructors. */
13797 type = TREE_TYPE (decl);
13798 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13800 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13801 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13802 && CLASSTYPE_VBASECLASSES (type));
13806 if (TREE_CODE (type) == ARRAY_TYPE)
13809 addr = build_address (decl);
13811 /* Optimize for space over speed here. */
13812 if (!has_vbases || flag_expensive_optimizations)
13813 flags |= LOOKUP_NONVIRTUAL;
13815 call = build_delete (TREE_TYPE (addr), addr,
13816 sfk_complete_destructor, flags, 0, complain);
13817 if (call == error_mark_node)
13818 cleanup = error_mark_node;
13820 cleanup = cp_build_compound_expr (cleanup, call, complain);
13825 /* build_delete sets the location of the destructor call to the
13826 current location, even though the destructor is going to be
13827 called later, at the end of the current scope. This can lead to
13828 a "jumpy" behaviour for users of debuggers when they step around
13829 the end of the block. So let's unset the location of the
13830 destructor call instead. */
13831 if (cleanup != NULL && EXPR_P (cleanup))
13832 SET_EXPR_LOCATION (cleanup, UNKNOWN_LOCATION);
13837 /* When a stmt has been parsed, this function is called. */
13844 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13845 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13846 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13849 static_fn_type (tree memfntype)
13854 if (TYPE_PTRMEMFUNC_P (memfntype))
13855 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13856 if (POINTER_TYPE_P (memfntype)
13857 || TREE_CODE (memfntype) == FUNCTION_DECL)
13858 memfntype = TREE_TYPE (memfntype);
13859 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13861 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13862 args = TYPE_ARG_TYPES (memfntype);
13863 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13864 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13865 fntype = (cp_build_type_attribute_variant
13866 (fntype, TYPE_ATTRIBUTES (memfntype)));
13867 fntype = (build_exception_variant
13868 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13872 /* DECL was originally constructed as a non-static member function,
13873 but turned out to be static. Update it accordingly. */
13876 revert_static_member_fn (tree decl)
13878 tree stype = static_fn_type (decl);
13879 cp_cv_quals quals = type_memfn_quals (stype);
13881 if (quals != TYPE_UNQUALIFIED)
13882 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13884 TREE_TYPE (decl) = stype;
13886 if (DECL_ARGUMENTS (decl))
13887 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13888 DECL_STATIC_FUNCTION_P (decl) = 1;
13891 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13892 one of the language-independent trees. */
13894 enum cp_tree_node_structure_enum
13895 cp_tree_node_structure (union lang_tree_node * t)
13897 switch (TREE_CODE (&t->generic))
13899 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13900 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13901 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13902 case OVERLOAD: return TS_CP_OVERLOAD;
13903 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13904 case PTRMEM_CST: return TS_CP_PTRMEM;
13905 case BASELINK: return TS_CP_BASELINK;
13906 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13907 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13908 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13909 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13910 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13911 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13912 default: return TS_CP_GENERIC;
13916 /* Build the void_list_node (void_type_node having been created). */
13918 build_void_list_node (void)
13920 tree t = build_tree_list (NULL_TREE, void_type_node);
13925 cp_missing_noreturn_ok_p (tree decl)
13927 /* A missing noreturn is ok for the `main' function. */
13928 return DECL_MAIN_P (decl);
13931 /* Return the COMDAT group into which DECL should be placed. */
13934 cxx_comdat_group (tree decl)
13938 /* Virtual tables, construction virtual tables, and virtual table
13939 tables all go in a single COMDAT group, named after the primary
13941 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13942 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13943 /* For all other DECLs, the COMDAT group is the mangled name of the
13944 declaration itself. */
13947 while (DECL_THUNK_P (decl))
13949 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13950 into the same section as the target function. In that case
13951 we must return target's name. */
13952 tree target = THUNK_TARGET (decl);
13953 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13954 && DECL_SECTION_NAME (target) != NULL
13955 && DECL_ONE_ONLY (target))
13960 name = DECL_ASSEMBLER_NAME (decl);
13966 #include "gt-cp-decl.h"