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
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 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1207 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1209 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1210 && TREE_CODE (olddecl) != TEMPLATE_DECL
1211 && check_raw_literal_operator (olddecl))
1212 error ("literal operator template %q+D conflicts with"
1213 " raw literal operator %qD", newdecl, olddecl);
1214 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1215 && TREE_CODE (olddecl) == TEMPLATE_DECL
1216 && check_raw_literal_operator (newdecl))
1217 error ("raw literal operator %q+D conflicts with"
1218 " literal operator template %qD", newdecl, olddecl);
1221 if (DECL_P (olddecl)
1222 && TREE_CODE (newdecl) == FUNCTION_DECL
1223 && TREE_CODE (olddecl) == FUNCTION_DECL
1224 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1226 if (DECL_DECLARED_INLINE_P (newdecl)
1227 && DECL_UNINLINABLE (newdecl)
1228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 /* Already warned elsewhere. */;
1230 else if (DECL_DECLARED_INLINE_P (olddecl)
1231 && DECL_UNINLINABLE (olddecl)
1232 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1233 /* Already warned. */;
1234 else if (DECL_DECLARED_INLINE_P (newdecl)
1235 && DECL_UNINLINABLE (olddecl)
1236 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1238 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1240 warning (OPT_Wattributes, "previous declaration of %q+D "
1241 "with attribute noinline", olddecl);
1243 else if (DECL_DECLARED_INLINE_P (olddecl)
1244 && DECL_UNINLINABLE (newdecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared with "
1248 "attribute noinline", newdecl);
1249 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1254 /* Check for redeclaration and other discrepancies. */
1255 if (TREE_CODE (olddecl) == FUNCTION_DECL
1256 && DECL_ARTIFICIAL (olddecl))
1258 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1259 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1261 /* Avoid warnings redeclaring built-ins which have not been
1262 explicitly declared. */
1263 if (DECL_ANTICIPATED (olddecl))
1266 /* If you declare a built-in or predefined function name as static,
1267 the old definition is overridden, but optionally warn this was a
1268 bad choice of name. */
1269 if (! TREE_PUBLIC (newdecl))
1271 warning (OPT_Wshadow,
1272 DECL_BUILT_IN (olddecl)
1273 ? G_("shadowing built-in function %q#D")
1274 : G_("shadowing library function %q#D"), olddecl);
1275 /* Discard the old built-in function. */
1278 /* If the built-in is not ansi, then programs can override
1279 it even globally without an error. */
1280 else if (! DECL_BUILT_IN (olddecl))
1281 warning (0, "library function %q#D redeclared as non-function %q#D",
1285 error ("declaration of %q#D", newdecl);
1286 error ("conflicts with built-in declaration %q#D",
1291 else if (!types_match)
1293 /* Avoid warnings redeclaring built-ins which have not been
1294 explicitly declared. */
1295 if (DECL_ANTICIPATED (olddecl))
1297 /* Deal with fileptr_type_node. FILE type is not known
1298 at the time we create the builtins. */
1301 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1302 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1307 else if (TREE_VALUE (t2) == fileptr_type_node)
1309 tree t = TREE_VALUE (t1);
1311 if (TREE_CODE (t) == POINTER_TYPE
1312 && TYPE_NAME (TREE_TYPE (t))
1313 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1314 == get_identifier ("FILE")
1315 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1317 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1320 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1321 types_match = decls_match (newdecl, olddecl);
1323 return duplicate_decls (newdecl, olddecl,
1325 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1328 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1331 else if ((DECL_EXTERN_C_P (newdecl)
1332 && DECL_EXTERN_C_P (olddecl))
1333 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1336 /* A near match; override the builtin. */
1338 if (TREE_PUBLIC (newdecl))
1340 warning (0, "new declaration %q#D", newdecl);
1341 warning (0, "ambiguates built-in declaration %q#D",
1345 warning (OPT_Wshadow,
1346 DECL_BUILT_IN (olddecl)
1347 ? G_("shadowing built-in function %q#D")
1348 : G_("shadowing library function %q#D"), olddecl);
1351 /* Discard the old built-in function. */
1354 /* Replace the old RTL to avoid problems with inlining. */
1355 COPY_DECL_RTL (newdecl, olddecl);
1357 /* Even if the types match, prefer the new declarations type for
1358 built-ins which have not been explicitly declared, for
1359 exception lists, etc... */
1360 else if (DECL_IS_BUILTIN (olddecl))
1362 tree type = TREE_TYPE (newdecl);
1363 tree attribs = (*targetm.merge_type_attributes)
1364 (TREE_TYPE (olddecl), type);
1366 type = cp_build_type_attribute_variant (type, attribs);
1367 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1370 /* If a function is explicitly declared "throw ()", propagate that to
1371 the corresponding builtin. */
1372 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1373 && DECL_ANTICIPATED (olddecl)
1374 && TREE_NOTHROW (newdecl)
1375 && !TREE_NOTHROW (olddecl))
1377 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1378 tree tmpdecl = builtin_decl_explicit (fncode);
1379 if (tmpdecl && tmpdecl != olddecl && types_match)
1380 TREE_NOTHROW (tmpdecl) = 1;
1383 /* Whether or not the builtin can throw exceptions has no
1384 bearing on this declarator. */
1385 TREE_NOTHROW (olddecl) = 0;
1387 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1389 /* If a builtin function is redeclared as `static', merge
1390 the declarations, but make the original one static. */
1391 DECL_THIS_STATIC (olddecl) = 1;
1392 TREE_PUBLIC (olddecl) = 0;
1394 /* Make the old declaration consistent with the new one so
1395 that all remnants of the builtin-ness of this function
1396 will be banished. */
1397 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1398 COPY_DECL_RTL (newdecl, olddecl);
1401 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 /* C++ Standard, 3.3, clause 4:
1404 "[Note: a namespace name or a class template name must be unique
1405 in its declarative region (7.3.2, clause 14). ]" */
1406 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1407 && TREE_CODE (newdecl) != NAMESPACE_DECL
1408 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1409 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1410 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1413 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1414 && TREE_CODE (newdecl) != TYPE_DECL)
1415 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1416 && TREE_CODE (olddecl) != TYPE_DECL))
1418 /* We do nothing special here, because C++ does such nasty
1419 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1420 get shadowed, and know that if we need to find a TYPE_DECL
1421 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1422 slot of the identifier. */
1426 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1428 || (TREE_CODE (olddecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1433 error ("%q#D redeclared as different kind of symbol", newdecl);
1434 if (TREE_CODE (olddecl) == TREE_LIST)
1435 olddecl = TREE_VALUE (olddecl);
1436 error ("previous declaration of %q+#D", olddecl);
1438 return error_mark_node;
1440 else if (!types_match)
1442 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1443 /* These are certainly not duplicate declarations; they're
1444 from different scopes. */
1447 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1449 /* The name of a class template may not be declared to refer to
1450 any other template, class, function, object, namespace, value,
1451 or type in the same scope. */
1452 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1453 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1455 error ("declaration of template %q#D", newdecl);
1456 error ("conflicts with previous declaration %q+#D", olddecl);
1458 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1459 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1460 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1461 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1462 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1463 DECL_TEMPLATE_PARMS (olddecl))
1464 /* Template functions can be disambiguated by
1466 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1467 TREE_TYPE (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1474 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1476 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1478 error ("declaration of C function %q#D conflicts with",
1480 error ("previous declaration %q+#D here", olddecl);
1483 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1484 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1486 error ("new declaration %q#D", newdecl);
1487 error ("ambiguates old declaration %q+#D", olddecl);
1488 return error_mark_node;
1495 error ("conflicting declaration %q#D", newdecl);
1496 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1497 return error_mark_node;
1500 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1501 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1502 && (!DECL_TEMPLATE_INFO (newdecl)
1503 || (DECL_TI_TEMPLATE (newdecl)
1504 != DECL_TI_TEMPLATE (olddecl))))
1505 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1506 && (!DECL_TEMPLATE_INFO (olddecl)
1507 || (DECL_TI_TEMPLATE (olddecl)
1508 != DECL_TI_TEMPLATE (newdecl))))))
1509 /* It's OK to have a template specialization and a non-template
1510 with the same type, or to have specializations of two
1511 different templates with the same type. Note that if one is a
1512 specialization, and the other is an instantiation of the same
1513 template, that we do not exit at this point. That situation
1514 can occur if we instantiate a template class, and then
1515 specialize one of its methods. This situation is valid, but
1516 the declarations must be merged in the usual way. */
1518 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1519 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1520 && !DECL_USE_TEMPLATE (newdecl))
1521 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1522 && !DECL_USE_TEMPLATE (olddecl))))
1523 /* One of the declarations is a template instantiation, and the
1524 other is not a template at all. That's OK. */
1526 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1528 /* In [namespace.alias] we have:
1530 In a declarative region, a namespace-alias-definition can be
1531 used to redefine a namespace-alias declared in that declarative
1532 region to refer only to the namespace to which it already
1535 Therefore, if we encounter a second alias directive for the same
1536 alias, we can just ignore the second directive. */
1537 if (DECL_NAMESPACE_ALIAS (newdecl)
1538 && (DECL_NAMESPACE_ALIAS (newdecl)
1539 == DECL_NAMESPACE_ALIAS (olddecl)))
1541 /* [namespace.alias]
1543 A namespace-name or namespace-alias shall not be declared as
1544 the name of any other entity in the same declarative region.
1545 A namespace-name defined at global scope shall not be
1546 declared as the name of any other entity in any global scope
1548 error ("declaration of namespace %qD conflicts with", newdecl);
1549 error ("previous declaration of namespace %q+D here", olddecl);
1550 return error_mark_node;
1554 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1557 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1558 if (DECL_NAME (olddecl) != NULL_TREE)
1559 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1560 ? G_("%q+#D previously defined here")
1561 : G_("%q+#D previously declared here"), olddecl);
1562 return error_mark_node;
1564 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1565 && DECL_INITIAL (olddecl) != NULL_TREE
1566 && !prototype_p (TREE_TYPE (olddecl))
1567 && prototype_p (TREE_TYPE (newdecl)))
1569 /* Prototype decl follows defn w/o prototype. */
1570 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1571 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1572 "follows non-prototype definition here");
1574 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1575 || TREE_CODE (olddecl) == VAR_DECL)
1576 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1579 If two declarations of the same function or object
1580 specify different linkage-specifications ..., the program
1581 is ill-formed.... Except for functions with C++ linkage,
1582 a function declaration without a linkage specification
1583 shall not precede the first linkage specification for
1584 that function. A function can be declared without a
1585 linkage specification after an explicit linkage
1586 specification has been seen; the linkage explicitly
1587 specified in the earlier declaration is not affected by
1588 such a function declaration.
1590 DR 563 raises the question why the restrictions on
1591 functions should not also apply to objects. Older
1592 versions of G++ silently ignore the linkage-specification
1600 which is clearly wrong. Therefore, we now treat objects
1602 if (current_lang_depth () == 0)
1604 /* There is no explicit linkage-specification, so we use
1605 the linkage from the previous declaration. */
1606 if (!DECL_LANG_SPECIFIC (newdecl))
1607 retrofit_lang_decl (newdecl);
1608 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1612 error ("previous declaration of %q+#D with %qL linkage",
1613 olddecl, DECL_LANGUAGE (olddecl));
1614 error ("conflicts with new declaration with %qL linkage",
1615 DECL_LANGUAGE (newdecl));
1619 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1621 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1623 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1624 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1627 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1630 for (; t1 && t1 != void_list_node;
1631 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1632 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1634 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1637 permerror (input_location, "default argument given for parameter %d of %q#D",
1639 permerror (input_location, "after previous specification in %q+#D", olddecl);
1643 error ("default argument given for parameter %d of %q#D",
1645 error ("after previous specification in %q+#D",
1652 /* Do not merge an implicit typedef with an explicit one. In:
1656 typedef class A A __attribute__ ((foo));
1658 the attribute should apply only to the typedef. */
1659 if (TREE_CODE (olddecl) == TYPE_DECL
1660 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1661 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1664 /* If new decl is `static' and an `extern' was seen previously,
1666 warn_extern_redeclared_static (newdecl, olddecl);
1668 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1669 return error_mark_node;
1671 /* We have committed to returning 1 at this point. */
1672 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1674 /* Now that functions must hold information normally held
1675 by field decls, there is extra work to do so that
1676 declaration information does not get destroyed during
1678 if (DECL_VINDEX (olddecl))
1679 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1680 if (DECL_CONTEXT (olddecl))
1681 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1682 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1683 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1684 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1685 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1686 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1687 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1688 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1689 SET_OVERLOADED_OPERATOR_CODE
1690 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1691 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1693 /* Optionally warn about more than one declaration for the same
1694 name, but don't warn about a function declaration followed by a
1696 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1697 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1698 /* Don't warn about extern decl followed by definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1700 /* Don't warn about friends, let add_friend take care of it. */
1701 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1703 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1704 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1707 if (DECL_DELETED_FN (newdecl))
1709 error ("deleted definition of %qD", newdecl);
1710 error ("after previous declaration %q+D", olddecl);
1712 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1715 /* Deal with C++: must preserve virtual function table size. */
1716 if (TREE_CODE (olddecl) == TYPE_DECL)
1718 tree newtype = TREE_TYPE (newdecl);
1719 tree oldtype = TREE_TYPE (olddecl);
1721 if (newtype != error_mark_node && oldtype != error_mark_node
1722 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1723 CLASSTYPE_FRIEND_CLASSES (newtype)
1724 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1726 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1729 /* Copy all the DECL_... slots specified in the new decl
1730 except for any that we copy here from the old type. */
1731 DECL_ATTRIBUTES (newdecl)
1732 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1734 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1738 old_result = DECL_TEMPLATE_RESULT (olddecl);
1739 new_result = DECL_TEMPLATE_RESULT (newdecl);
1740 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1741 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1742 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1743 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1745 DECL_ATTRIBUTES (old_result)
1746 = (*targetm.merge_decl_attributes) (old_result, new_result);
1748 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1750 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1751 && DECL_INITIAL (new_result))
1753 if (DECL_INITIAL (old_result))
1754 DECL_UNINLINABLE (old_result) = 1;
1756 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1757 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1758 DECL_NOT_REALLY_EXTERN (old_result)
1759 = DECL_NOT_REALLY_EXTERN (new_result);
1760 DECL_INTERFACE_KNOWN (old_result)
1761 = DECL_INTERFACE_KNOWN (new_result);
1762 DECL_DECLARED_INLINE_P (old_result)
1763 = DECL_DECLARED_INLINE_P (new_result);
1764 DECL_DISREGARD_INLINE_LIMITS (old_result)
1765 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1770 DECL_DECLARED_INLINE_P (old_result)
1771 |= DECL_DECLARED_INLINE_P (new_result);
1772 DECL_DISREGARD_INLINE_LIMITS (old_result)
1773 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1774 check_redeclaration_exception_specification (newdecl, olddecl);
1778 /* If the new declaration is a definition, update the file and
1779 line information on the declaration, and also make
1780 the old declaration the same definition. */
1781 if (DECL_INITIAL (new_result) != NULL_TREE)
1783 DECL_SOURCE_LOCATION (olddecl)
1784 = DECL_SOURCE_LOCATION (old_result)
1785 = DECL_SOURCE_LOCATION (newdecl);
1786 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1787 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1790 DECL_ARGUMENTS (old_result)
1791 = DECL_ARGUMENTS (new_result);
1792 for (parm = DECL_ARGUMENTS (old_result); parm;
1793 parm = DECL_CHAIN (parm))
1794 DECL_CONTEXT (parm) = old_result;
1803 /* Automatically handles default parameters. */
1804 tree oldtype = TREE_TYPE (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 maybe_instantiate_noexcept (olddecl);
1810 /* Merge the data types specified in the two decls. */
1811 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1813 /* If merge_types produces a non-typedef type, just use the old type. */
1814 if (TREE_CODE (newdecl) == TYPE_DECL
1815 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1818 if (TREE_CODE (newdecl) == VAR_DECL)
1820 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1821 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1822 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1823 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1824 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1825 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1827 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1828 if (DECL_LANG_SPECIFIC (olddecl)
1829 && CP_DECL_THREADPRIVATE_P (olddecl))
1831 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1832 if (!DECL_LANG_SPECIFIC (newdecl))
1833 retrofit_lang_decl (newdecl);
1835 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1836 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1840 /* Do this after calling `merge_types' so that default
1841 parameters don't confuse us. */
1842 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 check_redeclaration_exception_specification (newdecl, olddecl);
1844 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 check_default_args (newdecl);
1849 /* Lay the type out, unless already done. */
1850 if (! same_type_p (newtype, oldtype)
1851 && TREE_TYPE (newdecl) != error_mark_node
1852 && !(processing_template_decl && uses_template_parms (newdecl)))
1853 layout_type (TREE_TYPE (newdecl));
1855 if ((TREE_CODE (newdecl) == VAR_DECL
1856 || TREE_CODE (newdecl) == PARM_DECL
1857 || TREE_CODE (newdecl) == RESULT_DECL
1858 || TREE_CODE (newdecl) == FIELD_DECL
1859 || TREE_CODE (newdecl) == TYPE_DECL)
1860 && !(processing_template_decl && uses_template_parms (newdecl)))
1861 layout_decl (newdecl, 0);
1863 /* Merge the type qualifiers. */
1864 if (TREE_READONLY (newdecl))
1865 TREE_READONLY (olddecl) = 1;
1866 if (TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (olddecl) = 1;
1868 if (TREE_NOTHROW (newdecl))
1869 TREE_NOTHROW (olddecl) = 1;
1871 /* Merge deprecatedness. */
1872 if (TREE_DEPRECATED (newdecl))
1873 TREE_DEPRECATED (olddecl) = 1;
1875 /* Preserve function specific target and optimization options */
1876 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1878 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1879 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1880 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1881 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1883 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1885 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1889 /* Merge the initialization information. */
1890 if (DECL_INITIAL (newdecl) == NULL_TREE
1891 && DECL_INITIAL (olddecl) != NULL_TREE)
1893 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1898 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1902 /* Merge the section attribute.
1903 We want to issue an error if the sections conflict but that must be
1904 done later in decl_attributes since we are called before attributes
1906 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1907 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1912 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1915 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1916 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1917 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1918 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1919 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1920 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1921 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1922 /* Keep the old RTL. */
1923 COPY_DECL_RTL (olddecl, newdecl);
1925 else if (TREE_CODE (newdecl) == VAR_DECL
1926 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1928 /* Keep the old RTL. We cannot keep the old RTL if the old
1929 declaration was for an incomplete object and the new
1930 declaration is not since many attributes of the RTL will
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1939 /* Clean out any memory we had of the old declaration. */
1940 tree oldstatic = value_member (olddecl, static_aggregates);
1942 TREE_VALUE (oldstatic) = error_mark_node;
1944 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1945 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1946 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1947 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1950 /* Merge the storage class information. */
1951 merge_weak (newdecl, olddecl);
1953 if (DECL_ONE_ONLY (olddecl))
1954 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1956 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1957 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1959 if (! DECL_EXTERNAL (olddecl))
1960 DECL_EXTERNAL (newdecl) = 0;
1962 new_template_info = NULL_TREE;
1963 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1965 bool new_redefines_gnu_inline = false;
1967 if (new_defines_function
1968 && ((DECL_INTERFACE_KNOWN (olddecl)
1969 && TREE_CODE (olddecl) == FUNCTION_DECL)
1970 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1971 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1972 == FUNCTION_DECL))))
1976 if (TREE_CODE (fn) == TEMPLATE_DECL)
1977 fn = DECL_TEMPLATE_RESULT (olddecl);
1979 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1982 if (!new_redefines_gnu_inline)
1984 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1985 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1986 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1988 DECL_TEMPLATE_INSTANTIATED (newdecl)
1989 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1990 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1992 /* If the OLDDECL is an instantiation and/or specialization,
1993 then the NEWDECL must be too. But, it may not yet be marked
1994 as such if the caller has created NEWDECL, but has not yet
1995 figured out that it is a redeclaration. */
1996 if (!DECL_USE_TEMPLATE (newdecl))
1997 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1999 /* Don't really know how much of the language-specific
2000 values we should copy from old to new. */
2001 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2002 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2003 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2004 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2006 if (LANG_DECL_HAS_MIN (newdecl))
2008 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2009 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2010 if (DECL_TEMPLATE_INFO (newdecl))
2011 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2012 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2014 /* Only functions have these fields. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL
2016 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2018 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2019 olddecl_friend = DECL_FRIEND_P (olddecl);
2020 hidden_friend = (DECL_ANTICIPATED (olddecl)
2021 && DECL_HIDDEN_FRIEND_P (olddecl)
2022 && newdecl_is_friend);
2023 DECL_BEFRIENDING_CLASSES (newdecl)
2024 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2025 DECL_BEFRIENDING_CLASSES (olddecl));
2026 /* DECL_THUNKS is only valid for virtual functions,
2027 otherwise it is a DECL_FRIEND_CONTEXT. */
2028 if (DECL_VIRTUAL_P (newdecl))
2029 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2031 /* Only variables have this field. */
2032 else if (TREE_CODE (newdecl) == VAR_DECL
2033 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2034 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 /* Merge parameter attributes. */
2042 tree oldarg, newarg;
2043 for (oldarg = DECL_ARGUMENTS(olddecl),
2044 newarg = DECL_ARGUMENTS(newdecl);
2046 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2047 DECL_ATTRIBUTES (newarg)
2048 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2049 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2052 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2053 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2055 /* If newdecl is not a specialization, then it is not a
2056 template-related function at all. And that means that we
2057 should have exited above, returning 0. */
2058 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2060 if (DECL_ODR_USED (olddecl))
2061 /* From [temp.expl.spec]:
2063 If a template, a member template or the member of a class
2064 template is explicitly specialized then that
2065 specialization shall be declared before the first use of
2066 that specialization that would cause an implicit
2067 instantiation to take place, in every translation unit in
2068 which such a use occurs. */
2069 error ("explicit specialization of %qD after first use",
2072 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2074 /* Don't propagate visibility from the template to the
2075 specialization here. We'll do that in determine_visibility if
2077 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2079 /* [temp.expl.spec/14] We don't inline explicit specialization
2080 just because the primary template says so. */
2082 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2083 the always_inline attribute. */
2084 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2085 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2087 if (DECL_DECLARED_INLINE_P (newdecl))
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2090 DECL_ATTRIBUTES (newdecl)
2091 = remove_attribute ("always_inline",
2092 DECL_ATTRIBUTES (newdecl));
2095 else if (new_defines_function && DECL_INITIAL (olddecl))
2097 /* Never inline re-defined extern inline functions.
2098 FIXME: this could be better handled by keeping both
2099 function as separate declarations. */
2100 DECL_UNINLINABLE (newdecl) = 1;
2104 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2105 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2107 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2109 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2110 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2112 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2113 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2114 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2115 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2118 /* Preserve abstractness on cloned [cd]tors. */
2119 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2121 /* Update newdecl's parms to point at olddecl. */
2122 for (parm = DECL_ARGUMENTS (newdecl); parm;
2123 parm = DECL_CHAIN (parm))
2124 DECL_CONTEXT (parm) = olddecl;
2128 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2129 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2130 COPY_DECL_RTL (newdecl, olddecl);
2132 if (! types_match || new_defines_function)
2134 /* These need to be copied so that the names are available.
2135 Note that if the types do match, we'll preserve inline
2136 info and other bits, but if not, we won't. */
2137 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2138 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2140 if (new_defines_function)
2141 /* If defining a function declared with other language
2142 linkage, use the previously declared language linkage. */
2143 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2144 else if (types_match)
2146 /* If redeclaring a builtin function, and not a definition,
2147 it stays built in. */
2148 if (DECL_BUILT_IN (olddecl))
2150 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2151 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2152 /* If we're keeping the built-in definition, keep the rtl,
2153 regardless of declaration matches. */
2154 COPY_DECL_RTL (olddecl, newdecl);
2155 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2157 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2160 /* If a compatible prototype of these builtin functions
2161 is seen, assume the runtime implements it with the
2162 expected semantics. */
2163 case BUILT_IN_STPCPY:
2164 if (builtin_decl_explicit_p (fncode))
2165 set_builtin_decl_implicit_p (fncode, true);
2173 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2174 /* Don't clear out the arguments if we're just redeclaring a
2176 if (DECL_ARGUMENTS (olddecl))
2177 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2180 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2181 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2183 /* Now preserve various other info from the definition. */
2184 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2185 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2186 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2187 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2189 /* Warn about conflicting visibility specifications. */
2190 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2191 && DECL_VISIBILITY_SPECIFIED (newdecl)
2192 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2194 warning_at (input_location, OPT_Wattributes,
2195 "%q+D: visibility attribute ignored because it", newdecl);
2196 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2197 "conflicts with previous declaration here");
2199 /* Choose the declaration which specified visibility. */
2200 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2202 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2203 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2205 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2206 so keep this behavior. */
2207 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2209 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2210 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2212 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2213 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2214 if (TREE_CODE (newdecl) == FIELD_DECL)
2215 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2217 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2218 with that from NEWDECL below. */
2219 if (DECL_LANG_SPECIFIC (olddecl))
2221 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2222 != DECL_LANG_SPECIFIC (newdecl));
2223 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2226 /* Merge the USED information. */
2227 if (TREE_USED (olddecl))
2228 TREE_USED (newdecl) = 1;
2229 else if (TREE_USED (newdecl))
2230 TREE_USED (olddecl) = 1;
2231 if (TREE_CODE (newdecl) == VAR_DECL)
2233 if (DECL_READ_P (olddecl))
2234 DECL_READ_P (newdecl) = 1;
2235 else if (DECL_READ_P (newdecl))
2236 DECL_READ_P (olddecl) = 1;
2238 if (DECL_PRESERVE_P (olddecl))
2239 DECL_PRESERVE_P (newdecl) = 1;
2240 else if (DECL_PRESERVE_P (newdecl))
2241 DECL_PRESERVE_P (olddecl) = 1;
2243 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 function_size = sizeof (struct tree_decl_common);
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 function_size - sizeof (struct tree_common));
2253 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2254 (char *) newdecl + sizeof (struct tree_decl_common),
2255 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2256 if (new_template_info)
2257 /* If newdecl is a template instantiation, it is possible that
2258 the following sequence of events has occurred:
2260 o A friend function was declared in a class template. The
2261 class template was instantiated.
2263 o The instantiation of the friend declaration was
2264 recorded on the instantiation list, and is newdecl.
2266 o Later, however, instantiate_class_template called pushdecl
2267 on the newdecl to perform name injection. But, pushdecl in
2268 turn called duplicate_decls when it discovered that another
2269 declaration of a global function with the same name already
2272 o Here, in duplicate_decls, we decided to clobber newdecl.
2274 If we're going to do that, we'd better make sure that
2275 olddecl, and not newdecl, is on the list of
2276 instantiations so that if we try to do the instantiation
2277 again we won't get the clobbered declaration. */
2278 reregister_specialization (newdecl,
2284 size_t size = tree_code_size (TREE_CODE (olddecl));
2285 memcpy ((char *) olddecl + sizeof (struct tree_common),
2286 (char *) newdecl + sizeof (struct tree_common),
2287 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2288 switch (TREE_CODE (olddecl))
2298 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2299 (char *) newdecl + sizeof (struct tree_decl_common),
2300 size - sizeof (struct tree_decl_common)
2301 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2305 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2306 (char *) newdecl + sizeof (struct tree_decl_common),
2307 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2308 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2312 DECL_UID (olddecl) = olddecl_uid;
2314 DECL_FRIEND_P (olddecl) = 1;
2317 DECL_ANTICIPATED (olddecl) = 1;
2318 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2321 /* NEWDECL contains the merged attribute lists.
2322 Update OLDDECL to be the same. */
2323 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2325 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2326 so that encode_section_info has a chance to look at the new decl
2327 flags and attributes. */
2328 if (DECL_RTL_SET_P (olddecl)
2329 && (TREE_CODE (olddecl) == FUNCTION_DECL
2330 || (TREE_CODE (olddecl) == VAR_DECL
2331 && TREE_STATIC (olddecl))))
2332 make_decl_rtl (olddecl);
2334 /* The NEWDECL will no longer be needed. Because every out-of-class
2335 declaration of a member results in a call to duplicate_decls,
2336 freeing these nodes represents in a significant savings. */
2342 /* Return zero if the declaration NEWDECL is valid
2343 when the declaration OLDDECL (assumed to be for the same name)
2344 has already been seen.
2345 Otherwise return an error message format string with a %s
2346 where the identifier should go. */
2349 redeclaration_error_message (tree newdecl, tree olddecl)
2351 if (TREE_CODE (newdecl) == TYPE_DECL)
2353 /* Because C++ can put things into name space for free,
2354 constructs like "typedef struct foo { ... } foo"
2355 would look like an erroneous redeclaration. */
2356 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2359 return G_("redefinition of %q#D");
2361 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2363 /* If this is a pure function, its olddecl will actually be
2364 the original initialization to `0' (which we force to call
2365 abort()). Don't complain about redefinition in this case. */
2366 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2367 && DECL_INITIAL (olddecl) == NULL_TREE)
2370 /* If both functions come from different namespaces, this is not
2371 a redeclaration - this is a conflict with a used function. */
2372 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2373 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2374 && ! decls_match (olddecl, newdecl))
2375 return G_("%qD conflicts with used function");
2377 /* We'll complain about linkage mismatches in
2378 warn_extern_redeclared_static. */
2380 /* Defining the same name twice is no good. */
2381 if (DECL_INITIAL (olddecl) != NULL_TREE
2382 && DECL_INITIAL (newdecl) != NULL_TREE)
2384 if (DECL_NAME (olddecl) == NULL_TREE)
2385 return G_("%q#D not declared in class");
2386 else if (!GNU_INLINE_P (olddecl)
2387 || GNU_INLINE_P (newdecl))
2388 return G_("redefinition of %q#D");
2391 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2393 bool olda = GNU_INLINE_P (olddecl);
2394 bool newa = GNU_INLINE_P (newdecl);
2399 return G_("%q+D redeclared inline with "
2400 "%<gnu_inline%> attribute");
2402 return G_("%q+D redeclared inline without "
2403 "%<gnu_inline%> attribute");
2409 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2413 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2415 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2416 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2417 return G_("redefinition of %q#D");
2421 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2422 || (DECL_TEMPLATE_RESULT (newdecl)
2423 == DECL_TEMPLATE_RESULT (olddecl)))
2426 nt = DECL_TEMPLATE_RESULT (newdecl);
2427 if (DECL_TEMPLATE_INFO (nt))
2428 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2429 ot = DECL_TEMPLATE_RESULT (olddecl);
2430 if (DECL_TEMPLATE_INFO (ot))
2431 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2432 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2433 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2434 return G_("redefinition of %q#D");
2436 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2438 bool olda = GNU_INLINE_P (ot);
2439 bool newa = GNU_INLINE_P (nt);
2444 return G_("%q+D redeclared inline with "
2445 "%<gnu_inline%> attribute");
2447 return G_("%q+D redeclared inline without "
2448 "%<gnu_inline%> attribute");
2452 /* Core issue #226 (C++0x):
2454 If a friend function template declaration specifies a
2455 default template-argument, that declaration shall be a
2456 definition and shall be the only declaration of the
2457 function template in the translation unit. */
2458 if ((cxx_dialect != cxx98)
2459 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2460 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2461 /*is_primary=*/1, /*is_partial=*/0,
2462 /*is_friend_decl=*/2))
2463 return G_("redeclaration of friend %q#D "
2464 "may not have default template arguments");
2468 else if (TREE_CODE (newdecl) == VAR_DECL
2469 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2470 && (! DECL_LANG_SPECIFIC (olddecl)
2471 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2472 || DECL_THREAD_LOCAL_P (newdecl)))
2474 /* Only variables can be thread-local, and all declarations must
2475 agree on this property. */
2476 if (DECL_THREAD_LOCAL_P (newdecl))
2477 return G_("thread-local declaration of %q#D follows "
2478 "non-thread-local declaration");
2480 return G_("non-thread-local declaration of %q#D follows "
2481 "thread-local declaration");
2483 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2485 /* The objects have been declared at namespace scope. If either
2486 is a member of an anonymous union, then this is an invalid
2487 redeclaration. For example:
2493 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2494 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2495 return G_("redeclaration of %q#D");
2496 /* If at least one declaration is a reference, there is no
2497 conflict. For example:
2503 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2505 /* Reject two definitions. */
2506 return G_("redefinition of %q#D");
2510 /* Objects declared with block scope: */
2511 /* Reject two definitions, and reject a definition
2512 together with an external reference. */
2513 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2514 return G_("redeclaration of %q#D");
2519 /* Hash and equality functions for the named_label table. */
2522 named_label_entry_hash (const void *data)
2524 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2525 return DECL_UID (ent->label_decl);
2529 named_label_entry_eq (const void *a, const void *b)
2531 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2532 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2533 return ent_a->label_decl == ent_b->label_decl;
2536 /* Create a new label, named ID. */
2539 make_label_decl (tree id, int local_p)
2541 struct named_label_entry *ent;
2545 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2547 DECL_CONTEXT (decl) = current_function_decl;
2548 DECL_MODE (decl) = VOIDmode;
2549 C_DECLARED_LABEL_FLAG (decl) = local_p;
2551 /* Say where one reference is to the label, for the sake of the
2552 error if it is not defined. */
2553 DECL_SOURCE_LOCATION (decl) = input_location;
2555 /* Record the fact that this identifier is bound to this label. */
2556 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2558 /* Create the label htab for the function on demand. */
2560 named_labels = htab_create_ggc (13, named_label_entry_hash,
2561 named_label_entry_eq, NULL);
2563 /* Record this label on the list of labels used in this function.
2564 We do this before calling make_label_decl so that we get the
2565 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2566 ent = ggc_alloc_cleared_named_label_entry ();
2567 ent->label_decl = decl;
2569 slot = htab_find_slot (named_labels, ent, INSERT);
2570 gcc_assert (*slot == NULL);
2576 /* Look for a label named ID in the current function. If one cannot
2577 be found, create one. (We keep track of used, but undefined,
2578 labels, and complain about them at the end of a function.) */
2581 lookup_label_1 (tree id)
2585 /* You can't use labels at global scope. */
2586 if (current_function_decl == NULL_TREE)
2588 error ("label %qE referenced outside of any function", id);
2592 /* See if we've already got this label. */
2593 decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2597 decl = make_label_decl (id, /*local_p=*/0);
2601 /* Wrapper for lookup_label_1. */
2604 lookup_label (tree id)
2607 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2608 ret = lookup_label_1 (id);
2609 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2613 /* Declare a local label named ID. */
2616 declare_local_label (tree id)
2619 cp_label_binding *bind;
2621 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2622 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2623 bind = VEC_safe_push (cp_label_binding, gc,
2624 current_binding_level->shadowed_labels, NULL);
2625 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2627 decl = make_label_decl (id, /*local_p=*/1);
2633 /* Returns nonzero if it is ill-formed to jump past the declaration of
2634 DECL. Returns 2 if it's also a real problem. */
2637 decl_jump_unsafe (tree decl)
2639 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2640 with automatic storage duration is not in scope to a point where it is
2641 in scope is ill-formed unless the variable has scalar type, class type
2642 with a trivial default constructor and a trivial destructor, a
2643 cv-qualified version of one of these types, or an array of one of the
2644 preceding types and is declared without an initializer (8.5). */
2645 tree type = TREE_TYPE (decl);
2647 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2648 || type == error_mark_node)
2651 type = strip_array_types (type);
2653 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2654 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2657 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2663 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2666 identify_goto (tree decl, const location_t *locus)
2669 permerror (input_location, "jump to label %qD", decl);
2671 permerror (input_location, "jump to case label");
2673 permerror (*locus, " from here");
2676 /* Check that a single previously seen jump to a newly defined label
2677 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2678 the jump context; NAMES are the names in scope in LEVEL at the jump
2679 context; LOCUS is the source position of the jump or 0. Returns
2680 true if all is well. */
2683 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2684 bool exited_omp, const location_t *locus)
2686 cp_binding_level *b;
2687 bool identified = false, saw_eh = false, saw_omp = false;
2691 identify_goto (decl, locus);
2692 error (" exits OpenMP structured block");
2693 identified = saw_omp = true;
2696 for (b = current_binding_level; b ; b = b->level_chain)
2698 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2700 for (new_decls = b->names; new_decls != old_decls;
2701 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2702 : TREE_CHAIN (new_decls)))
2704 int problem = decl_jump_unsafe (new_decls);
2710 identify_goto (decl, locus);
2714 error (" crosses initialization of %q+#D", new_decls);
2716 permerror (input_location, " enters scope of %q+#D which has "
2717 "non-trivial destructor", new_decls);
2722 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2726 identify_goto (decl, locus);
2729 if (b->kind == sk_try)
2730 error (" enters try block");
2732 error (" enters catch block");
2735 if (b->kind == sk_omp && !saw_omp)
2739 identify_goto (decl, locus);
2742 error (" enters OpenMP structured block");
2751 check_previous_goto (tree decl, struct named_label_use_entry *use)
2753 check_previous_goto_1 (decl, use->binding_level,
2754 use->names_in_scope, use->in_omp_scope,
2755 &use->o_goto_locus);
2759 check_switch_goto (cp_binding_level* level)
2761 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2764 /* Check that a new jump to a label DECL is OK. Called by
2765 finish_goto_stmt. */
2768 check_goto (tree decl)
2770 struct named_label_entry *ent, dummy;
2771 bool saw_catch = false, identified = false;
2775 /* We can't know where a computed goto is jumping.
2776 So we assume that it's OK. */
2777 if (TREE_CODE (decl) != LABEL_DECL)
2780 /* We didn't record any information about this label when we created it,
2781 and there's not much point since it's trivial to analyze as a return. */
2782 if (decl == cdtor_label)
2785 dummy.label_decl = decl;
2786 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2787 gcc_assert (ent != NULL);
2789 /* If the label hasn't been defined yet, defer checking. */
2790 if (! DECL_INITIAL (decl))
2792 struct named_label_use_entry *new_use;
2794 /* Don't bother creating another use if the last goto had the
2795 same data, and will therefore create the same set of errors. */
2797 && ent->uses->names_in_scope == current_binding_level->names)
2800 new_use = ggc_alloc_named_label_use_entry ();
2801 new_use->binding_level = current_binding_level;
2802 new_use->names_in_scope = current_binding_level->names;
2803 new_use->o_goto_locus = input_location;
2804 new_use->in_omp_scope = false;
2806 new_use->next = ent->uses;
2807 ent->uses = new_use;
2811 if (ent->in_try_scope || ent->in_catch_scope
2812 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2814 permerror (input_location, "jump to label %q+D", decl);
2815 permerror (input_location, " from here");
2819 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2821 int u = decl_jump_unsafe (bad);
2823 if (u > 1 && DECL_ARTIFICIAL (bad))
2825 /* Can't skip init of __exception_info. */
2826 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2830 error (" skips initialization of %q+#D", bad);
2832 permerror (input_location, " enters scope of %q+#D which has "
2833 "non-trivial destructor", bad);
2836 if (ent->in_try_scope)
2837 error (" enters try block");
2838 else if (ent->in_catch_scope && !saw_catch)
2839 error (" enters catch block");
2841 if (ent->in_omp_scope)
2842 error (" enters OpenMP structured block");
2843 else if (flag_openmp)
2845 cp_binding_level *b;
2846 for (b = current_binding_level; b ; b = b->level_chain)
2848 if (b == ent->binding_level)
2850 if (b->kind == sk_omp)
2854 permerror (input_location, "jump to label %q+D", decl);
2855 permerror (input_location, " from here");
2858 error (" exits OpenMP structured block");
2865 /* Check that a return is ok wrt OpenMP structured blocks.
2866 Called by finish_return_stmt. Returns true if all is well. */
2869 check_omp_return (void)
2871 cp_binding_level *b;
2872 for (b = current_binding_level; b ; b = b->level_chain)
2873 if (b->kind == sk_omp)
2875 error ("invalid exit from OpenMP structured block");
2878 else if (b->kind == sk_function_parms)
2883 /* Define a label, specifying the location in the source file.
2884 Return the LABEL_DECL node for the label. */
2887 define_label_1 (location_t location, tree name)
2889 struct named_label_entry *ent, dummy;
2890 cp_binding_level *p;
2893 decl = lookup_label (name);
2895 dummy.label_decl = decl;
2896 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2897 gcc_assert (ent != NULL);
2899 /* After labels, make any new cleanups in the function go into their
2900 own new (temporary) binding contour. */
2901 for (p = current_binding_level;
2902 p->kind != sk_function_parms;
2904 p->more_cleanups_ok = 0;
2906 if (name == get_identifier ("wchar_t"))
2907 permerror (input_location, "label named wchar_t");
2909 if (DECL_INITIAL (decl) != NULL_TREE)
2911 error ("duplicate label %qD", decl);
2912 return error_mark_node;
2916 struct named_label_use_entry *use;
2918 /* Mark label as having been defined. */
2919 DECL_INITIAL (decl) = error_mark_node;
2920 /* Say where in the source. */
2921 DECL_SOURCE_LOCATION (decl) = location;
2923 ent->binding_level = current_binding_level;
2924 ent->names_in_scope = current_binding_level->names;
2926 for (use = ent->uses; use ; use = use->next)
2927 check_previous_goto (decl, use);
2934 /* Wrapper for define_label_1. */
2937 define_label (location_t location, tree name)
2940 timevar_start (TV_NAME_LOOKUP);
2941 ret = define_label_1 (location, name);
2942 timevar_stop (TV_NAME_LOOKUP);
2949 cp_binding_level *level;
2950 struct cp_switch *next;
2951 /* The SWITCH_STMT being built. */
2953 /* A splay-tree mapping the low element of a case range to the high
2954 element, or NULL_TREE if there is no high element. Used to
2955 determine whether or not a new case label duplicates an old case
2956 label. We need a tree, rather than simply a hash table, because
2957 of the GNU case range extension. */
2961 /* A stack of the currently active switch statements. The innermost
2962 switch statement is on the top of the stack. There is no need to
2963 mark the stack for garbage collection because it is only active
2964 during the processing of the body of a function, and we never
2965 collect at that point. */
2967 static struct cp_switch *switch_stack;
2969 /* Called right after a switch-statement condition is parsed.
2970 SWITCH_STMT is the switch statement being parsed. */
2973 push_switch (tree switch_stmt)
2975 struct cp_switch *p = XNEW (struct cp_switch);
2976 p->level = current_binding_level;
2977 p->next = switch_stack;
2978 p->switch_stmt = switch_stmt;
2979 p->cases = splay_tree_new (case_compare, NULL, NULL);
2986 struct cp_switch *cs = switch_stack;
2987 location_t switch_location;
2989 /* Emit warnings as needed. */
2990 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2991 if (!processing_template_decl)
2992 c_do_switch_warnings (cs->cases, switch_location,
2993 SWITCH_STMT_TYPE (cs->switch_stmt),
2994 SWITCH_STMT_COND (cs->switch_stmt));
2996 splay_tree_delete (cs->cases);
2997 switch_stack = switch_stack->next;
3001 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3002 condition. Note that if TYPE and VALUE are already integral we don't
3003 really do the conversion because the language-independent
3004 warning/optimization code will work better that way. */
3007 case_conversion (tree type, tree value)
3009 if (value == NULL_TREE)
3012 if (cxx_dialect >= cxx0x
3013 && (SCOPED_ENUM_P (type)
3014 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3016 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3017 type = type_promotes_to (type);
3018 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3020 return cxx_constant_value (value);
3023 /* Note that we've seen a definition of a case label, and complain if this
3024 is a bad place for one. */
3027 finish_case_label (location_t loc, tree low_value, tree high_value)
3030 cp_binding_level *p;
3033 if (processing_template_decl)
3037 /* For templates, just add the case label; we'll do semantic
3038 analysis at instantiation-time. */
3039 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3040 return add_stmt (build_case_label (low_value, high_value, label));
3043 /* Find the condition on which this switch statement depends. */
3044 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3045 if (cond && TREE_CODE (cond) == TREE_LIST)
3046 cond = TREE_VALUE (cond);
3048 if (!check_switch_goto (switch_stack->level))
3049 return error_mark_node;
3051 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3053 low_value = case_conversion (type, low_value);
3054 high_value = case_conversion (type, high_value);
3056 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3057 low_value, high_value);
3059 /* After labels, make any new cleanups in the function go into their
3060 own new (temporary) binding contour. */
3061 for (p = current_binding_level;
3062 p->kind != sk_function_parms;
3064 p->more_cleanups_ok = 0;
3069 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3072 typename_hash (const void* k)
3075 const_tree const t = (const_tree) k;
3077 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3078 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3083 typedef struct typename_info {
3091 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3092 really of type `typename_info*' */
3095 typename_compare (const void * k1, const void * k2)
3097 const_tree const t1 = (const_tree) k1;
3098 const typename_info *const t2 = (const typename_info *) k2;
3100 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3101 && TYPE_CONTEXT (t1) == t2->scope
3102 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3103 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3104 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3107 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3108 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3110 Returns the new TYPENAME_TYPE. */
3112 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3115 build_typename_type (tree context, tree name, tree fullname,
3116 enum tag_types tag_type)
3124 if (typename_htab == NULL)
3125 typename_htab = htab_create_ggc (61, &typename_hash,
3126 &typename_compare, NULL);
3128 ti.scope = FROB_CONTEXT (context);
3130 ti.template_id = fullname;
3131 ti.enum_p = tag_type == enum_type;
3132 ti.class_p = (tag_type == class_type
3133 || tag_type == record_type
3134 || tag_type == union_type);
3135 hash = (htab_hash_pointer (ti.scope)
3136 ^ htab_hash_pointer (ti.name));
3138 /* See if we already have this type. */
3139 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3144 /* Build the TYPENAME_TYPE. */
3145 t = cxx_make_type (TYPENAME_TYPE);
3146 TYPE_CONTEXT (t) = ti.scope;
3147 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3148 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3149 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3151 /* Build the corresponding TYPE_DECL. */
3152 d = build_decl (input_location, TYPE_DECL, name, t);
3153 TYPE_NAME (TREE_TYPE (d)) = d;
3154 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3155 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3156 DECL_ARTIFICIAL (d) = 1;
3158 /* Store it in the hash table. */
3161 /* TYPENAME_TYPEs must always be compared structurally, because
3162 they may or may not resolve down to another type depending on
3163 the currently open classes. */
3164 SET_TYPE_STRUCTURAL_EQUALITY (t);
3170 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3171 provided to name the type. Returns an appropriate type, unless an
3172 error occurs, in which case error_mark_node is returned. If we
3173 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3174 return that, rather than the _TYPE it corresponds to, in other
3175 cases we look through the type decl. If TF_ERROR is set, complain
3176 about errors, otherwise be quiet. */
3179 make_typename_type (tree context, tree name, enum tag_types tag_type,
3180 tsubst_flags_t complain)
3186 if (name == error_mark_node
3187 || context == NULL_TREE
3188 || context == error_mark_node)
3189 return error_mark_node;
3193 if (!(TYPE_LANG_SPECIFIC (name)
3194 && (CLASSTYPE_IS_TEMPLATE (name)
3195 || CLASSTYPE_USE_TEMPLATE (name))))
3196 name = TYPE_IDENTIFIER (name);
3198 /* Create a TEMPLATE_ID_EXPR for the type. */
3199 name = build_nt (TEMPLATE_ID_EXPR,
3200 CLASSTYPE_TI_TEMPLATE (name),
3201 CLASSTYPE_TI_ARGS (name));
3203 else if (TREE_CODE (name) == TYPE_DECL)
3204 name = DECL_NAME (name);
3208 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3210 name = TREE_OPERAND (name, 0);
3211 if (TREE_CODE (name) == TEMPLATE_DECL)
3212 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3213 else if (TREE_CODE (name) == OVERLOAD)
3215 error ("%qD is not a type", name);
3216 return error_mark_node;
3219 if (TREE_CODE (name) == TEMPLATE_DECL)
3221 error ("%qD used without template parameters", name);
3222 return error_mark_node;
3224 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3225 gcc_assert (TYPE_P (context));
3227 if (!MAYBE_CLASS_TYPE_P (context))
3229 if (complain & tf_error)
3230 error ("%q#T is not a class", context);
3231 return error_mark_node;
3234 /* When the CONTEXT is a dependent type, NAME could refer to a
3235 dependent base class of CONTEXT. But look inside it anyway
3236 if CONTEXT is a currently open scope, in case it refers to a
3237 member of the current instantiation or a non-dependent base;
3238 lookup will stop when we hit a dependent base. */
3239 if (!dependent_scope_p (context))
3240 /* We should only set WANT_TYPE when we're a nested typename type.
3241 Then we can give better diagnostics if we find a non-type. */
3242 t = lookup_field (context, name, 2, /*want_type=*/true);
3246 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3247 return build_typename_type (context, name, fullname, tag_type);
3249 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3253 if (complain & tf_error)
3254 error (want_template ? G_("no class template named %q#T in %q#T")
3255 : G_("no type named %q#T in %q#T"), name, context);
3256 return error_mark_node;
3259 /* Pull out the template from an injected-class-name (or multiple). */
3261 t = maybe_get_template_decl_from_type_decl (t);
3263 if (TREE_CODE (t) == TREE_LIST)
3265 if (complain & tf_error)
3267 error ("lookup of %qT in %qT is ambiguous", name, context);
3268 print_candidates (t);
3270 return error_mark_node;
3273 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3275 if (complain & tf_error)
3276 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3278 return error_mark_node;
3280 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3282 if (complain & tf_error)
3283 error ("%<typename %T::%D%> names %q#T, which is not a type",
3285 return error_mark_node;
3288 if (complain & tf_error)
3289 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3291 /* If we are currently parsing a template and if T is a typedef accessed
3292 through CONTEXT then we need to remember and check access of T at
3293 template instantiation time. */
3294 add_typedef_to_current_template_for_access_check (t, context, input_location);
3297 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3299 /*entering_scope=*/0,
3300 tf_warning_or_error | tf_user);
3302 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3308 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3309 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3310 in which case error_mark_node is returned.
3312 If PARM_LIST is non-NULL, also make sure that the template parameter
3313 list of TEMPLATE_DECL matches.
3315 If COMPLAIN zero, don't complain about any errors that occur. */
3318 make_unbound_class_template (tree context, tree name, tree parm_list,
3319 tsubst_flags_t complain)
3325 name = TYPE_IDENTIFIER (name);
3326 else if (DECL_P (name))
3327 name = DECL_NAME (name);
3328 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3330 if (!dependent_type_p (context)
3331 || currently_open_class (context))
3333 tree tmpl = NULL_TREE;
3335 if (MAYBE_CLASS_TYPE_P (context))
3336 tmpl = lookup_field (context, name, 0, false);
3338 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3339 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3341 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3343 if (complain & tf_error)
3344 error ("no class template named %q#T in %q#T", name, context);
3345 return error_mark_node;
3349 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3351 if (complain & tf_error)
3353 error ("template parameters do not match template");
3354 error ("%q+D declared here", tmpl);
3356 return error_mark_node;
3359 if (complain & tf_error)
3360 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3365 /* Build the UNBOUND_CLASS_TEMPLATE. */
3366 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3367 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3368 TREE_TYPE (t) = NULL_TREE;
3369 SET_TYPE_STRUCTURAL_EQUALITY (t);
3371 /* Build the corresponding TEMPLATE_DECL. */
3372 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3373 TYPE_NAME (TREE_TYPE (d)) = d;
3374 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3375 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3376 DECL_ARTIFICIAL (d) = 1;
3377 DECL_TEMPLATE_PARMS (d) = parm_list;
3384 /* Push the declarations of builtin types into the namespace.
3385 RID_INDEX is the index of the builtin type in the array
3386 RID_POINTERS. NAME is the name used when looking up the builtin
3387 type. TYPE is the _TYPE node for the builtin type. */
3390 record_builtin_type (enum rid rid_index,
3394 tree rname = NULL_TREE, tname = NULL_TREE;
3395 tree tdecl = NULL_TREE;
3397 if ((int) rid_index < (int) RID_MAX)
3398 rname = ridpointers[(int) rid_index];
3400 tname = get_identifier (name);
3402 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3403 eliminated. Built-in types should not be looked up name; their
3404 names are keywords that the parser can recognize. However, there
3405 is code in c-common.c that uses identifier_global_value to look
3406 up built-in types by name. */
3409 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3410 DECL_ARTIFICIAL (tdecl) = 1;
3411 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3417 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3418 DECL_ARTIFICIAL (tdecl) = 1;
3420 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3423 if (!TYPE_NAME (type))
3424 TYPE_NAME (type) = tdecl;
3427 debug_hooks->type_decl (tdecl, 0);
3430 /* Record one of the standard Java types.
3431 * Declare it as having the given NAME.
3432 * If SIZE > 0, it is the size of one of the integral types;
3433 * otherwise it is the negative of the size of one of the other types. */
3436 record_builtin_java_type (const char* name, int size)
3441 type = build_nonstandard_integer_type (size, 0);
3442 type = build_distinct_type_copy (type);
3444 else if (size > -32)
3447 /* "__java_char" or ""__java_boolean". */
3448 type = build_nonstandard_integer_type (-size, 1);
3449 type = build_distinct_type_copy (type);
3450 /* Get the signed type cached and attached to the unsigned type,
3451 so it doesn't get garbage-collected at "random" times,
3452 causing potential codegen differences out of different UIDs
3453 and different alias set numbers. */
3454 stype = build_nonstandard_integer_type (-size, 0);
3455 stype = build_distinct_type_copy (stype);
3456 TREE_CHAIN (type) = stype;
3457 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3460 { /* "__java_float" or ""__java_double". */
3461 type = make_node (REAL_TYPE);
3462 TYPE_PRECISION (type) = - size;
3465 record_builtin_type (RID_MAX, name, type);
3466 decl = TYPE_NAME (type);
3468 /* Suppress generate debug symbol entries for these types,
3469 since for normal C++ they are just clutter.
3470 However, push_lang_context undoes this if extern "Java" is seen. */
3471 DECL_IGNORED_P (decl) = 1;
3473 TYPE_FOR_JAVA (type) = 1;
3477 /* Push a type into the namespace so that the back ends ignore it. */
3480 record_unknown_type (tree type, const char* name)
3482 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3483 TYPE_DECL, get_identifier (name), type));
3484 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3485 DECL_IGNORED_P (decl) = 1;
3486 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3487 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3488 TYPE_ALIGN (type) = 1;
3489 TYPE_USER_ALIGN (type) = 0;
3490 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3493 /* A string for which we should create an IDENTIFIER_NODE at
3496 typedef struct predefined_identifier
3498 /* The name of the identifier. */
3499 const char *const name;
3500 /* The place where the IDENTIFIER_NODE should be stored. */
3502 /* Nonzero if this is the name of a constructor or destructor. */
3503 const int ctor_or_dtor_p;
3504 } predefined_identifier;
3506 /* Create all the predefined identifiers. */
3509 initialize_predefined_identifiers (void)
3511 const predefined_identifier *pid;
3513 /* A table of identifiers to create at startup. */
3514 static const predefined_identifier predefined_identifiers[] = {
3515 { "C++", &lang_name_cplusplus, 0 },
3516 { "C", &lang_name_c, 0 },
3517 { "Java", &lang_name_java, 0 },
3518 /* Some of these names have a trailing space so that it is
3519 impossible for them to conflict with names written by users. */
3520 { "__ct ", &ctor_identifier, 1 },
3521 { "__base_ctor ", &base_ctor_identifier, 1 },
3522 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3523 { "__dt ", &dtor_identifier, 1 },
3524 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3525 { "__base_dtor ", &base_dtor_identifier, 1 },
3526 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3527 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3528 { "nelts", &nelts_identifier, 0 },
3529 { THIS_NAME, &this_identifier, 0 },
3530 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3531 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3532 { "_vptr", &vptr_identifier, 0 },
3533 { "__vtt_parm", &vtt_parm_identifier, 0 },
3534 { "::", &global_scope_name, 0 },
3535 { "std", &std_identifier, 0 },
3539 for (pid = predefined_identifiers; pid->name; ++pid)
3541 *pid->node = get_identifier (pid->name);
3542 if (pid->ctor_or_dtor_p)
3543 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3547 /* Create the predefined scalar types of C,
3548 and some nodes representing standard constants (0, 1, (void *)0).
3549 Initialize the global binding level.
3550 Make definitions for built-in primitive functions. */
3553 cxx_init_decl_processing (void)
3556 tree void_ftype_ptr;
3558 /* Create all the identifiers we need. */
3559 initialize_predefined_identifiers ();
3561 /* Create the global variables. */
3562 push_to_top_level ();
3564 current_function_decl = NULL_TREE;
3565 current_binding_level = NULL;
3566 /* Enter the global namespace. */
3567 gcc_assert (global_namespace == NULL_TREE);
3568 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3570 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3571 TREE_PUBLIC (global_namespace) = 1;
3572 begin_scope (sk_namespace, global_namespace);
3574 if (flag_visibility_ms_compat)
3575 default_visibility = VISIBILITY_HIDDEN;
3578 current_lang_name = lang_name_c;
3580 /* Create the `std' namespace. */
3581 push_namespace (std_identifier);
3582 std_node = current_namespace;
3585 c_common_nodes_and_builtins ();
3587 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3588 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3589 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3590 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3591 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3592 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3593 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3594 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3596 integer_two_node = build_int_cst (NULL_TREE, 2);
3598 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3599 truthvalue_type_node = boolean_type_node;
3600 truthvalue_false_node = boolean_false_node;
3601 truthvalue_true_node = boolean_true_node;
3603 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3604 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3605 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3608 record_builtin_type (RID_MAX, NULL, string_type_node);
3611 delta_type_node = ptrdiff_type_node;
3612 vtable_index_type = ptrdiff_type_node;
3614 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3615 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3616 void_ftype_ptr = build_function_type_list (void_type_node,
3617 ptr_type_node, NULL_TREE);
3619 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3621 /* C++ extensions */
3623 unknown_type_node = make_node (LANG_TYPE);
3624 record_unknown_type (unknown_type_node, "unknown type");
3626 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3627 TREE_TYPE (unknown_type_node) = unknown_type_node;
3629 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3631 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3632 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3634 init_list_type_node = make_node (LANG_TYPE);
3635 record_unknown_type (init_list_type_node, "init list");
3637 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3638 record_unknown_type (dependent_lambda_return_type_node,
3639 "undeduced lambda return type");
3642 /* Make sure we get a unique function type, so we can give
3643 its pointer type a name. (This wins for gdb.) */
3644 tree vfunc_type = make_node (FUNCTION_TYPE);
3645 TREE_TYPE (vfunc_type) = integer_type_node;
3646 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3647 layout_type (vfunc_type);
3649 vtable_entry_type = build_pointer_type (vfunc_type);
3651 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3654 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3655 layout_type (vtbl_type_node);
3656 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3657 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3658 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3659 layout_type (vtbl_ptr_type_node);
3660 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3662 push_namespace (get_identifier ("__cxxabiv1"));
3663 abi_node = current_namespace;
3666 global_type_node = make_node (LANG_TYPE);
3667 record_unknown_type (global_type_node, "global type");
3670 current_lang_name = lang_name_cplusplus;
3673 tree newattrs, extvisattr;
3674 tree newtype, deltype;
3675 tree ptr_ftype_sizetype;
3679 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3680 if (cxx_dialect == cxx98)
3683 tree bad_alloc_type_node;
3684 tree bad_alloc_decl;
3686 push_namespace (std_identifier);
3687 bad_alloc_id = get_identifier ("bad_alloc");
3688 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3689 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3691 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3692 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3696 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3699 new_eh_spec = noexcept_false_spec;
3701 /* Ensure attribs.c is initialized. */
3703 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3705 newattrs = tree_cons (get_identifier ("alloc_size"),
3706 build_tree_list (NULL_TREE, integer_one_node),
3708 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3709 newtype = build_exception_variant (newtype, new_eh_spec);
3710 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3711 deltype = build_exception_variant (deltype, empty_except_spec);
3712 push_cp_library_fn (NEW_EXPR, newtype);
3713 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3714 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3715 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3717 nullptr_type_node = make_node (NULLPTR_TYPE);
3718 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3719 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3720 TYPE_UNSIGNED (nullptr_type_node) = 1;
3721 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3722 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3723 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3724 nullptr_node = build_int_cst (nullptr_type_node, 0);
3728 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3730 /* Perform other language dependent initializations. */
3731 init_class_processing ();
3732 init_rtti_processing ();
3733 init_template_processing ();
3735 if (flag_exceptions)
3736 init_exception_processing ();
3738 if (! supports_one_only ())
3741 make_fname_decl = cp_make_fname_decl;
3742 start_fname_decls ();
3744 /* Show we use EH for cleanups. */
3745 if (flag_exceptions)
3746 using_eh_for_cleanups ();
3749 /* Generate an initializer for a function naming variable from
3750 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3751 filled in with the type of the init. */
3754 cp_fname_init (const char* name, tree *type_p)
3756 tree domain = NULL_TREE;
3758 tree init = NULL_TREE;
3763 length = strlen (name);
3764 domain = build_index_type (size_int (length));
3765 init = build_string (length + 1, name);
3768 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3769 type = build_cplus_array_type (type, domain);
3774 TREE_TYPE (init) = type;
3776 init = error_mark_node;
3781 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3782 the decl, LOC is the location to give the decl, NAME is the
3783 initialization string and TYPE_DEP indicates whether NAME depended
3784 on the type of the function. We make use of that to detect
3785 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3786 at the point of first use, so we mustn't push the decl now. */
3789 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3791 const char *const name = (type_dep && processing_template_decl
3792 ? NULL : fname_as_string (type_dep));
3794 tree init = cp_fname_init (name, &type);
3795 tree decl = build_decl (loc, VAR_DECL, id, type);
3798 free (CONST_CAST (char *, name));
3800 /* As we're using pushdecl_with_scope, we must set the context. */
3801 DECL_CONTEXT (decl) = current_function_decl;
3802 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3804 TREE_STATIC (decl) = 1;
3805 TREE_READONLY (decl) = 1;
3806 DECL_ARTIFICIAL (decl) = 1;
3808 TREE_USED (decl) = 1;
3810 if (current_function_decl)
3812 cp_binding_level *b = current_binding_level;
3813 if (b->kind == sk_function_parms)
3814 return error_mark_node;
3815 while (b->level_chain->kind != sk_function_parms)
3817 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3818 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3819 LOOKUP_ONLYCONVERTING);
3823 DECL_THIS_STATIC (decl) = true;
3824 pushdecl_top_level_and_finish (decl, init);
3831 builtin_function_1 (tree decl, tree context, bool is_global)
3833 tree id = DECL_NAME (decl);
3834 const char *name = IDENTIFIER_POINTER (id);
3836 retrofit_lang_decl (decl);
3838 DECL_ARTIFICIAL (decl) = 1;
3839 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3840 SET_DECL_LANGUAGE (decl, lang_c);
3841 /* Runtime library routines are, by definition, available in an
3842 external shared object. */
3843 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3844 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3846 DECL_CONTEXT (decl) = context;
3849 pushdecl_top_level (decl);
3853 /* A function in the user's namespace should have an explicit
3854 declaration before it is used. Mark the built-in function as
3855 anticipated but not actually declared. */
3856 if (name[0] != '_' || name[1] != '_')
3857 DECL_ANTICIPATED (decl) = 1;
3858 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3860 size_t len = strlen (name);
3862 /* Treat __*_chk fortification functions as anticipated as well,
3863 unless they are __builtin_*. */
3864 if (len > strlen ("___chk")
3865 && memcmp (name + len - strlen ("_chk"),
3866 "_chk", strlen ("_chk") + 1) == 0)
3867 DECL_ANTICIPATED (decl) = 1;
3874 cxx_builtin_function (tree decl)
3876 tree id = DECL_NAME (decl);
3877 const char *name = IDENTIFIER_POINTER (id);
3878 /* All builtins that don't begin with an '_' should additionally
3879 go in the 'std' namespace. */
3882 tree decl2 = copy_node(decl);
3883 push_namespace (std_identifier);
3884 builtin_function_1 (decl2, std_node, false);
3888 return builtin_function_1 (decl, NULL_TREE, false);
3891 /* Like cxx_builtin_function, but guarantee the function is added to the global
3892 scope. This is to allow function specific options to add new machine
3893 dependent builtins when the target ISA changes via attribute((target(...)))
3894 which saves space on program startup if the program does not use non-generic
3898 cxx_builtin_function_ext_scope (tree decl)
3901 tree id = DECL_NAME (decl);
3902 const char *name = IDENTIFIER_POINTER (id);
3903 /* All builtins that don't begin with an '_' should additionally
3904 go in the 'std' namespace. */
3907 tree decl2 = copy_node(decl);
3908 push_namespace (std_identifier);
3909 builtin_function_1 (decl2, std_node, true);
3913 return builtin_function_1 (decl, NULL_TREE, true);
3916 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3917 function. Not called directly. */
3920 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3922 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3923 DECL_EXTERNAL (fn) = 1;
3924 TREE_PUBLIC (fn) = 1;
3925 DECL_ARTIFICIAL (fn) = 1;
3926 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3927 SET_DECL_LANGUAGE (fn, lang_c);
3928 /* Runtime library routines are, by definition, available in an
3929 external shared object. */
3930 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3931 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3935 /* Returns the _DECL for a library function with C linkage.
3936 We assume that such functions never throw; if this is incorrect,
3937 callers should unset TREE_NOTHROW. */
3940 build_library_fn (tree name, tree type)
3942 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3943 TREE_NOTHROW (fn) = 1;
3947 /* Returns the _DECL for a library function with C++ linkage. */
3950 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3952 tree fn = build_library_fn_1 (name, operator_code, type);
3953 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3954 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3955 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3959 /* Like build_library_fn, but takes a C string instead of an
3963 build_library_fn_ptr (const char* name, tree type)
3965 return build_library_fn (get_identifier (name), type);
3968 /* Like build_cp_library_fn, but takes a C string instead of an
3972 build_cp_library_fn_ptr (const char* name, tree type)
3974 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3977 /* Like build_library_fn, but also pushes the function so that we will
3978 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3979 may throw exceptions listed in RAISES. */
3982 push_library_fn (tree name, tree type, tree raises)
3987 type = build_exception_variant (type, raises);
3989 fn = build_library_fn (name, type);
3990 pushdecl_top_level (fn);
3994 /* Like build_cp_library_fn, but also pushes the function so that it
3995 will be found by normal lookup. */
3998 push_cp_library_fn (enum tree_code operator_code, tree type)
4000 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4007 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4011 push_void_library_fn (tree name, tree parmtypes)
4013 tree type = build_function_type (void_type_node, parmtypes);
4014 return push_library_fn (name, type, NULL_TREE);
4017 /* Like push_library_fn, but also note that this function throws
4018 and does not return. Used for __throw_foo and the like. */
4021 push_throw_library_fn (tree name, tree type)
4023 tree fn = push_library_fn (name, type, NULL_TREE);
4024 TREE_THIS_VOLATILE (fn) = 1;
4025 TREE_NOTHROW (fn) = 0;
4029 /* When we call finish_struct for an anonymous union, we create
4030 default copy constructors and such. But, an anonymous union
4031 shouldn't have such things; this function undoes the damage to the
4032 anonymous union type T.
4034 (The reason that we create the synthesized methods is that we don't
4035 distinguish `union { int i; }' from `typedef union { int i; } U'.
4036 The first is an anonymous union; the second is just an ordinary
4040 fixup_anonymous_aggr (tree t)
4044 /* Wipe out memory of synthesized methods. */
4045 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4046 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4047 TYPE_HAS_COPY_CTOR (t) = 0;
4048 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4049 TYPE_HAS_COPY_ASSIGN (t) = 0;
4050 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4052 /* Splice the implicitly generated functions out of the TYPE_METHODS
4054 q = &TYPE_METHODS (t);
4057 if (DECL_ARTIFICIAL (*q))
4058 *q = TREE_CHAIN (*q);
4060 q = &DECL_CHAIN (*q);
4063 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4064 if (TYPE_METHODS (t))
4066 tree decl = TYPE_MAIN_DECL (t);
4068 if (TREE_CODE (t) != UNION_TYPE)
4069 error_at (DECL_SOURCE_LOCATION (decl),
4070 "an anonymous struct cannot have function members");
4072 error_at (DECL_SOURCE_LOCATION (decl),
4073 "an anonymous union cannot have function members");
4076 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4077 assignment operators (because they cannot have these methods themselves).
4078 For anonymous unions this is already checked because they are not allowed
4079 in any union, otherwise we have to check it. */
4080 if (TREE_CODE (t) != UNION_TYPE)
4084 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4085 if (TREE_CODE (field) == FIELD_DECL)
4087 type = TREE_TYPE (field);
4088 if (CLASS_TYPE_P (type))
4090 if (TYPE_NEEDS_CONSTRUCTING (type))
4091 error ("member %q+#D with constructor not allowed "
4092 "in anonymous aggregate", field);
4093 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4094 error ("member %q+#D with destructor not allowed "
4095 "in anonymous aggregate", field);
4096 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4097 error ("member %q+#D with copy assignment operator "
4098 "not allowed in anonymous aggregate", field);
4104 /* Make sure that a declaration with no declarator is well-formed, i.e.
4105 just declares a tagged type or anonymous union.
4107 Returns the type declared; or NULL_TREE if none. */
4110 check_tag_decl (cp_decl_specifier_seq *declspecs)
4112 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4113 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4114 /* If a class, struct, or enum type is declared by the DECLSPECS
4115 (i.e, if a class-specifier, enum-specifier, or non-typename
4116 elaborated-type-specifier appears in the DECLSPECS),
4117 DECLARED_TYPE is set to the corresponding type. */
4118 tree declared_type = NULL_TREE;
4119 bool error_p = false;
4121 if (declspecs->multiple_types_p)
4122 error ("multiple types in one declaration");
4123 else if (declspecs->redefined_builtin_type)
4125 if (!in_system_header)
4126 permerror (input_location, "redeclaration of C++ built-in type %qT",
4127 declspecs->redefined_builtin_type);
4132 && TYPE_P (declspecs->type)
4133 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4134 && MAYBE_CLASS_TYPE_P (declspecs->type))
4135 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4136 declared_type = declspecs->type;
4137 else if (declspecs->type == error_mark_node)
4139 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4140 permerror (input_location, "declaration does not declare anything");
4141 /* Check for an anonymous union. */
4142 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4143 && TYPE_ANONYMOUS_P (declared_type))
4145 /* 7/3 In a simple-declaration, the optional init-declarator-list
4146 can be omitted only when declaring a class (clause 9) or
4147 enumeration (7.2), that is, when the decl-specifier-seq contains
4148 either a class-specifier, an elaborated-type-specifier with
4149 a class-key (9.1), or an enum-specifier. In these cases and
4150 whenever a class-specifier or enum-specifier is present in the
4151 decl-specifier-seq, the identifiers in these specifiers are among
4152 the names being declared by the declaration (as class-name,
4153 enum-names, or enumerators, depending on the syntax). In such
4154 cases, and except for the declaration of an unnamed bit-field (9.6),
4155 the decl-specifier-seq shall introduce one or more names into the
4156 program, or shall redeclare a name introduced by a previous
4157 declaration. [Example:
4158 enum { }; // ill-formed
4159 typedef class { }; // ill-formed
4163 error ("missing type-name in typedef-declaration");
4166 /* Anonymous unions are objects, so they can have specifiers. */;
4167 SET_ANON_AGGR_TYPE_P (declared_type);
4169 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4170 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4175 if (declspecs->specs[(int)ds_inline]
4176 || declspecs->specs[(int)ds_virtual])
4177 error ("%qs can only be specified for functions",
4178 declspecs->specs[(int)ds_inline]
4179 ? "inline" : "virtual");
4181 && (!current_class_type
4182 || current_scope () != current_class_type))
4183 error ("%<friend%> can only be specified inside a class");
4184 else if (declspecs->specs[(int)ds_explicit])
4185 error ("%<explicit%> can only be specified for constructors");
4186 else if (declspecs->storage_class)
4187 error ("a storage class can only be specified for objects "
4189 else if (declspecs->specs[(int)ds_const]
4190 || declspecs->specs[(int)ds_volatile]
4191 || declspecs->specs[(int)ds_restrict]
4192 || declspecs->specs[(int)ds_thread])
4193 error ("qualifiers can only be specified for objects "
4195 else if (saw_typedef)
4196 warning (0, "%<typedef%> was ignored in this declaration");
4197 else if (declspecs->specs[(int) ds_constexpr])
4198 error ("%<constexpr%> cannot be used for type declarations");
4201 return declared_type;
4204 /* Called when a declaration is seen that contains no names to declare.
4205 If its type is a reference to a structure, union or enum inherited
4206 from a containing scope, shadow that tag name for the current scope
4207 with a forward reference.
4208 If its type defines a new named structure or union
4209 or defines an enum, it is valid but we need not do anything here.
4210 Otherwise, it is an error.
4212 C++: may have to grok the declspecs to learn about static,
4213 complain for anonymous unions.
4215 Returns the TYPE declared -- or NULL_TREE if none. */
4218 shadow_tag (cp_decl_specifier_seq *declspecs)
4220 tree t = check_tag_decl (declspecs);
4225 if (declspecs->attributes)
4227 warning (0, "attribute ignored in declaration of %q+#T", t);
4228 warning (0, "attribute for %q+#T must follow the %qs keyword",
4229 t, class_key_or_enum_as_string (t));
4233 if (maybe_process_partial_specialization (t) == error_mark_node)
4236 /* This is where the variables in an anonymous union are
4237 declared. An anonymous union declaration looks like:
4239 because there is no declarator after the union, the parser
4240 sends that declaration here. */
4241 if (ANON_AGGR_TYPE_P (t))
4243 fixup_anonymous_aggr (t);
4245 if (TYPE_FIELDS (t))
4247 tree decl = grokdeclarator (/*declarator=*/NULL,
4248 declspecs, NORMAL, 0, NULL);
4249 finish_anon_union (decl);
4256 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4259 groktypename (cp_decl_specifier_seq *type_specifiers,
4260 const cp_declarator *declarator,
4261 bool is_template_arg)
4265 enum decl_context context
4266 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4267 attrs = type_specifiers->attributes;
4268 type_specifiers->attributes = NULL_TREE;
4269 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4270 if (attrs && type != error_mark_node)
4272 if (CLASS_TYPE_P (type))
4273 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4274 "outside of definition", type);
4275 else if (MAYBE_CLASS_TYPE_P (type))
4276 /* A template type parameter or other dependent type. */
4277 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4278 "type %qT without an associated declaration", type);
4280 cplus_decl_attributes (&type, attrs, 0);
4285 /* Process a DECLARATOR for a function-scope variable declaration,
4286 namespace-scope variable declaration, or function declaration.
4287 (Function definitions go through start_function; class member
4288 declarations appearing in the body of the class go through
4289 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4290 If an error occurs, the error_mark_node is returned instead.
4292 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4293 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4294 for an explicitly defaulted function, or SD_DELETED for an explicitly
4295 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4296 implicitly initialized via a default constructor. ATTRIBUTES and
4297 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4298 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4299 set, the caller is responsible for calling pop_scope. */
4302 start_decl (const cp_declarator *declarator,
4303 cp_decl_specifier_seq *declspecs,
4306 tree prefix_attributes,
4307 tree *pushed_scope_p)
4315 *pushed_scope_p = NULL_TREE;
4317 /* An object declared as __attribute__((deprecated)) suppresses
4318 warnings of uses of other deprecated items. */
4319 if (lookup_attribute ("deprecated", attributes))
4320 deprecated_state = DEPRECATED_SUPPRESS;
4322 attributes = chainon (attributes, prefix_attributes);
4324 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4327 deprecated_state = DEPRECATED_NORMAL;
4329 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4330 || decl == error_mark_node)
4331 return error_mark_node;
4333 context = CP_DECL_CONTEXT (decl);
4334 if (context != global_namespace)
4335 *pushed_scope_p = push_scope (context);
4338 /* Is it valid for this decl to have an initializer at all?
4339 If not, set INITIALIZED to zero, which will indirectly
4340 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4341 switch (TREE_CODE (decl))
4344 error ("typedef %qD is initialized (use decltype instead)", decl);
4345 return error_mark_node;
4348 if (initialized == SD_DELETED)
4349 /* We'll handle the rest of the semantics later, but we need to
4350 set this now so it's visible to duplicate_decls. */
4351 DECL_DELETED_FN (decl) = 1;
4360 if (! toplevel_bindings_p ()
4361 && DECL_EXTERNAL (decl))
4362 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4364 DECL_EXTERNAL (decl) = 0;
4365 if (toplevel_bindings_p ())
4366 TREE_STATIC (decl) = 1;
4368 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4370 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4371 record_key_method_defined (decl);
4373 /* If this is a typedef that names the class for linkage purposes
4374 (7.1.3p8), apply any attributes directly to the type. */
4375 if (TREE_CODE (decl) == TYPE_DECL
4376 && TAGGED_TYPE_P (TREE_TYPE (decl))
4377 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4378 flags = ATTR_FLAG_TYPE_IN_PLACE;
4382 /* Set attributes here so if duplicate decl, will have proper attributes. */
4383 cplus_decl_attributes (&decl, attributes, flags);
4385 /* Dllimported symbols cannot be defined. Static data members (which
4386 can be initialized in-class and dllimported) go through grokfield,
4387 not here, so we don't need to exclude those decls when checking for
4389 if (initialized && DECL_DLLIMPORT_P (decl))
4391 error ("definition of %q#D is marked %<dllimport%>", decl);
4392 DECL_DLLIMPORT_P (decl) = 0;
4395 /* If #pragma weak was used, mark the decl weak now. */
4396 maybe_apply_pragma_weak (decl);
4398 if (TREE_CODE (decl) == FUNCTION_DECL
4399 && DECL_DECLARED_INLINE_P (decl)
4400 && DECL_UNINLINABLE (decl)
4401 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4402 warning (0, "inline function %q+D given attribute noinline", decl);
4404 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4406 if (TREE_CODE (decl) == VAR_DECL)
4408 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4409 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4410 error ("%q#D is not a static member of %q#T", decl, context);
4413 if (DECL_CONTEXT (field) != context)
4415 if (!same_type_p (DECL_CONTEXT (field), context))
4416 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4417 "to be defined as %<%T::%D%>",
4418 DECL_CONTEXT (field), DECL_NAME (decl),
4419 context, DECL_NAME (decl));
4420 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4422 if (processing_specialization
4423 && template_class_depth (context) == 0
4424 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4425 error ("template header not allowed in member definition "
4426 "of explicitly specialized class");
4427 /* Static data member are tricky; an in-class initialization
4428 still doesn't provide a definition, so the in-class
4429 declaration will have DECL_EXTERNAL set, but will have an
4430 initialization. Thus, duplicate_decls won't warn
4431 about this situation, and so we check here. */
4432 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4433 error ("duplicate initialization of %qD", decl);
4434 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4436 if (declspecs->specs[(int) ds_constexpr]
4437 && !DECL_DECLARED_CONSTEXPR_P (field))
4438 error ("%qD declared %<constexpr%> outside its class", field);
4443 tree field = check_classfn (context, decl,
4444 (processing_template_decl
4445 > template_class_depth (context))
4446 ? current_template_parms
4448 if (field && field != error_mark_node
4449 && duplicate_decls (decl, field,
4450 /*newdecl_is_friend=*/false))
4454 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4455 DECL_IN_AGGR_P (decl) = 0;
4456 /* Do not mark DECL as an explicit specialization if it was not
4457 already marked as an instantiation; a declaration should
4458 never be marked as a specialization unless we know what
4459 template is being specialized. */
4460 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4462 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4464 /* [temp.expl.spec] An explicit specialization of a static data
4465 member of a template is a definition if the declaration
4466 includes an initializer; otherwise, it is a declaration.
4468 We check for processing_specialization so this only applies
4469 to the new specialization syntax. */
4470 if (!initialized && processing_specialization)
4471 DECL_EXTERNAL (decl) = 1;
4474 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4475 /* Aliases are definitions. */
4477 permerror (input_location, "declaration of %q#D outside of class is not definition",
4481 was_public = TREE_PUBLIC (decl);
4483 /* Enter this declaration into the symbol table. */
4484 decl = maybe_push_decl (decl);
4486 if (processing_template_decl)
4487 decl = push_template_decl (decl);
4488 if (decl == error_mark_node)
4489 return error_mark_node;
4491 /* Tell the back end to use or not use .common as appropriate. If we say
4492 -fconserve-space, we want this to save .data space, at the expense of
4493 wrong semantics. If we say -fno-conserve-space, we want this to
4494 produce errors about redefs; to do this we force variables into the
4496 if (flag_conserve_space
4497 && TREE_CODE (decl) == VAR_DECL
4498 && TREE_PUBLIC (decl)
4499 && !DECL_THREAD_LOCAL_P (decl)
4500 && !have_global_bss_p ())
4501 DECL_COMMON (decl) = 1;
4503 if (TREE_CODE (decl) == VAR_DECL
4504 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4505 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4507 /* This is a const variable with implicit 'static'. Set
4508 DECL_THIS_STATIC so we can tell it from variables that are
4509 !TREE_PUBLIC because of the anonymous namespace. */
4510 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4511 DECL_THIS_STATIC (decl) = 1;
4514 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4515 start_decl_1 (decl, initialized);
4520 /* Process the declaration of a variable DECL. INITIALIZED is true
4521 iff DECL is explicitly initialized. (INITIALIZED is false if the
4522 variable is initialized via an implicitly-called constructor.)
4523 This function must be called for ordinary variables (including, for
4524 example, implicit instantiations of templates), but must not be
4525 called for template declarations. */
4528 start_decl_1 (tree decl, bool initialized)
4532 bool aggregate_definition_p;
4534 gcc_assert (!processing_template_decl);
4536 if (error_operand_p (decl))
4539 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4541 type = TREE_TYPE (decl);
4542 complete_p = COMPLETE_TYPE_P (type);
4543 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4545 /* If an explicit initializer is present, or if this is a definition
4546 of an aggregate, then we need a complete type at this point.
4547 (Scalars are always complete types, so there is nothing to
4548 check.) This code just sets COMPLETE_P; errors (if necessary)
4549 are issued below. */
4550 if ((initialized || aggregate_definition_p)
4552 && COMPLETE_TYPE_P (complete_type (type)))
4555 /* We will not yet have set TREE_READONLY on DECL if the type
4556 was "const", but incomplete, before this point. But, now, we
4557 have a complete type, so we can try again. */
4558 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4562 /* Is it valid for this decl to have an initializer at all? */
4564 /* Don't allow initializations for incomplete types except for
4565 arrays which might be completed by the initialization. */
4567 ; /* A complete type is ok. */
4568 else if (type_uses_auto (type))
4569 ; /* An auto type is ok. */
4570 else if (TREE_CODE (type) != ARRAY_TYPE)
4572 error ("variable %q#D has initializer but incomplete type", decl);
4573 type = TREE_TYPE (decl) = error_mark_node;
4575 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4577 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4578 error ("elements of array %q#D have incomplete type", decl);
4579 /* else we already gave an error in start_decl. */
4582 else if (aggregate_definition_p && !complete_p)
4584 if (type_uses_auto (type))
4585 error ("declaration of %q#D has no initializer", decl);
4587 error ("aggregate %q#D has incomplete type and cannot be defined",
4589 /* Change the type so that assemble_variable will give
4590 DECL an rtl we can live with: (mem (const_int 0)). */
4591 type = TREE_TYPE (decl) = error_mark_node;
4594 /* Create a new scope to hold this declaration if necessary.
4595 Whether or not a new scope is necessary cannot be determined
4596 until after the type has been completed; if the type is a
4597 specialization of a class template it is not until after
4598 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4599 will be set correctly. */
4600 maybe_push_cleanup_level (type);
4603 /* Handle initialization of references. DECL, TYPE, and INIT have the
4604 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4605 but will be set to a new CLEANUP_STMT if a temporary is created
4606 that must be destroyed subsequently.
4608 Returns an initializer expression to use to initialize DECL, or
4609 NULL if the initialization can be performed statically.
4611 Quotes on semantics can be found in ARM 8.4.3. */
4614 grok_reference_init (tree decl, tree type, tree init, int flags)
4616 if (init == NULL_TREE)
4618 if ((DECL_LANG_SPECIFIC (decl) == 0
4619 || DECL_IN_AGGR_P (decl) == 0)
4620 && ! DECL_THIS_EXTERN (decl))
4621 error ("%qD declared as reference but not initialized", decl);
4625 if (TREE_CODE (init) == TREE_LIST)
4626 init = build_x_compound_expr_from_list (init, ELK_INIT,
4627 tf_warning_or_error);
4629 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4630 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4631 /* Note: default conversion is only called in very special cases. */
4632 init = decay_conversion (init);
4634 /* Convert INIT to the reference type TYPE. This may involve the
4635 creation of a temporary, whose lifetime must be the same as that
4636 of the reference. If so, a DECL_EXPR for the temporary will be
4637 added just after the DECL_EXPR for DECL. That's why we don't set
4638 DECL_INITIAL for local references (instead assigning to them
4639 explicitly); we need to allow the temporary to be initialized
4641 return initialize_reference (type, init, flags,
4642 tf_warning_or_error);
4645 /* Designated initializers in arrays are not supported in GNU C++.
4646 The parser cannot detect this error since it does not know whether
4647 a given brace-enclosed initializer is for a class type or for an
4648 array. This function checks that CE does not use a designated
4649 initializer. If it does, an error is issued. Returns true if CE
4650 is valid, i.e., does not have a designated initializer. */
4653 check_array_designated_initializer (const constructor_elt *ce,
4654 unsigned HOST_WIDE_INT index)
4656 /* Designated initializers for array elements are not supported. */
4659 /* The parser only allows identifiers as designated
4661 if (ce->index == error_mark_node)
4662 error ("name used in a GNU-style designated "
4663 "initializer for an array");
4664 else if (TREE_CODE (ce->index) == INTEGER_CST)
4666 /* A C99 designator is OK if it matches the current index. */
4667 if (TREE_INT_CST_LOW (ce->index) == index)
4670 sorry ("non-trivial designated initializers not supported");
4674 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4675 error ("name %qD used in a GNU-style designated "
4676 "initializer for an array", ce->index);
4684 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4685 array until we finish parsing the initializer. If that's the
4686 situation we're in, update DECL accordingly. */
4689 maybe_deduce_size_from_array_init (tree decl, tree init)
4691 tree type = TREE_TYPE (decl);
4693 if (TREE_CODE (type) == ARRAY_TYPE
4694 && TYPE_DOMAIN (type) == NULL_TREE
4695 && TREE_CODE (decl) != TYPE_DECL)
4697 /* do_default is really a C-ism to deal with tentative definitions.
4698 But let's leave it here to ease the eventual merge. */
4699 int do_default = !DECL_EXTERNAL (decl);
4700 tree initializer = init ? init : DECL_INITIAL (decl);
4703 /* Check that there are no designated initializers in INIT, as
4704 those are not supported in GNU C++, and as the middle-end
4705 will crash if presented with a non-numeric designated
4707 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4709 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4710 constructor_elt *ce;
4712 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4713 if (!check_array_designated_initializer (ce, i))
4719 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4723 error ("initializer fails to determine size of %qD", decl);
4724 TREE_TYPE (decl) = error_mark_node;
4726 else if (failure == 2)
4730 error ("array size missing in %qD", decl);
4731 TREE_TYPE (decl) = error_mark_node;
4733 /* If a `static' var's size isn't known, make it extern as
4734 well as static, so it does not get allocated. If it's not
4735 `static', then don't mark it extern; finish_incomplete_decl
4736 will give it a default size and it will get allocated. */
4737 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4738 DECL_EXTERNAL (decl) = 1;
4740 else if (failure == 3)
4742 error ("zero-size array %qD", decl);
4743 TREE_TYPE (decl) = error_mark_node;
4747 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4749 relayout_decl (decl);
4753 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4754 any appropriate error messages regarding the layout. */
4757 layout_var_decl (tree decl)
4761 type = TREE_TYPE (decl);
4762 if (type == error_mark_node)
4765 /* If we haven't already layed out this declaration, do so now.
4766 Note that we must not call complete type for an external object
4767 because it's type might involve templates that we are not
4768 supposed to instantiate yet. (And it's perfectly valid to say
4769 `extern X x' for some incomplete type `X'.) */
4770 if (!DECL_EXTERNAL (decl))
4771 complete_type (type);
4772 if (!DECL_SIZE (decl)
4773 && TREE_TYPE (decl) != error_mark_node
4774 && (COMPLETE_TYPE_P (type)
4775 || (TREE_CODE (type) == ARRAY_TYPE
4776 && !TYPE_DOMAIN (type)
4777 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4778 layout_decl (decl, 0);
4780 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4782 /* An automatic variable with an incomplete type: that is an error.
4783 Don't talk about array types here, since we took care of that
4784 message in grokdeclarator. */
4785 error ("storage size of %qD isn%'t known", decl);
4786 TREE_TYPE (decl) = error_mark_node;
4789 /* Keep this code around in case we later want to control debug info
4790 based on whether a type is "used". (jason 1999-11-11) */
4792 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4793 /* Let debugger know it should output info for this type. */
4794 note_debug_info_needed (ttype);
4796 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4797 note_debug_info_needed (DECL_CONTEXT (decl));
4800 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4801 && DECL_SIZE (decl) != NULL_TREE
4802 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4804 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4805 constant_expression_warning (DECL_SIZE (decl));
4808 error ("storage size of %qD isn%'t constant", decl);
4809 TREE_TYPE (decl) = error_mark_node;
4814 /* If a local static variable is declared in an inline function, or if
4815 we have a weak definition, we must endeavor to create only one
4816 instance of the variable at link-time. */
4819 maybe_commonize_var (tree decl)
4821 /* Static data in a function with comdat linkage also has comdat
4823 if (TREE_STATIC (decl)
4824 /* Don't mess with __FUNCTION__. */
4825 && ! DECL_ARTIFICIAL (decl)
4826 && DECL_FUNCTION_SCOPE_P (decl)
4827 && vague_linkage_p (DECL_CONTEXT (decl)))
4831 /* With weak symbols, we simply make the variable COMDAT;
4832 that will cause copies in multiple translations units to
4834 comdat_linkage (decl);
4838 if (DECL_INITIAL (decl) == NULL_TREE
4839 || DECL_INITIAL (decl) == error_mark_node)
4841 /* Without weak symbols, we can use COMMON to merge
4842 uninitialized variables. */
4843 TREE_PUBLIC (decl) = 1;
4844 DECL_COMMON (decl) = 1;
4848 /* While for initialized variables, we must use internal
4849 linkage -- which means that multiple copies will not
4851 TREE_PUBLIC (decl) = 0;
4852 DECL_COMMON (decl) = 0;
4853 warning_at (input_location, 0,
4854 "sorry: semantics of inline function static "
4855 "data %q+#D are wrong (you%'ll wind up "
4856 "with multiple copies)", decl);
4857 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4858 " you can work around this by removing "
4863 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4864 /* Set it up again; we might have set DECL_INITIAL since the last
4866 comdat_linkage (decl);
4869 /* Issue an error message if DECL is an uninitialized const variable. */
4872 check_for_uninitialized_const_var (tree decl)
4874 tree type = strip_array_types (TREE_TYPE (decl));
4876 /* ``Unless explicitly declared extern, a const object does not have
4877 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4879 if (TREE_CODE (decl) == VAR_DECL
4880 && TREE_CODE (type) != REFERENCE_TYPE
4881 && CP_TYPE_CONST_P (type)
4882 && !DECL_INITIAL (decl))
4884 tree field = default_init_uninitialized_part (type);
4888 permerror (DECL_SOURCE_LOCATION (decl),
4889 "uninitialized const %qD", decl);
4891 if (CLASS_TYPE_P (type))
4893 tree defaulted_ctor;
4895 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4896 "%q#T has no user-provided default constructor", type);
4897 defaulted_ctor = in_class_defaulted_default_constructor (type);
4899 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4900 "constructor is not user-provided because it is "
4901 "explicitly defaulted in the class body");
4902 inform (0, "and the implicitly-defined constructor does not "
4903 "initialize %q+#D", field);
4908 /* Structure holding the current initializer being processed by reshape_init.
4909 CUR is a pointer to the current element being processed, END is a pointer
4910 after the last element present in the initializer. */
4911 typedef struct reshape_iterator_t
4913 constructor_elt *cur;
4914 constructor_elt *end;
4917 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4919 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4920 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4921 initialized. If there are no more such fields, the return value
4925 next_initializable_field (tree field)
4928 && (TREE_CODE (field) != FIELD_DECL
4929 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4930 || DECL_ARTIFICIAL (field)))
4931 field = DECL_CHAIN (field);
4936 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4937 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4938 INTEGER_CST representing the size of the array minus one (the maximum index),
4939 or NULL_TREE if the array was declared without specifying the size. D is
4940 the iterator within the constructor. */
4943 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4944 tsubst_flags_t complain)
4947 bool sized_array_p = (max_index != NULL_TREE);
4948 unsigned HOST_WIDE_INT max_index_cst = 0;
4949 unsigned HOST_WIDE_INT index;
4951 /* The initializer for an array is always a CONSTRUCTOR. */
4952 new_init = build_constructor (init_list_type_node, NULL);
4956 /* Minus 1 is used for zero sized arrays. */
4957 if (integer_all_onesp (max_index))
4960 if (host_integerp (max_index, 1))
4961 max_index_cst = tree_low_cst (max_index, 1);
4962 /* sizetype is sign extended, not zero extended. */
4964 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4968 /* Loop until there are no more initializers. */
4970 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4975 check_array_designated_initializer (d->cur, index);
4976 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4978 if (elt_init == error_mark_node)
4979 return error_mark_node;
4980 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4981 size_int (index), elt_init);
4982 if (!TREE_CONSTANT (elt_init))
4983 TREE_CONSTANT (new_init) = false;
4989 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4990 Parameters are the same of reshape_init_r. */
4993 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
4995 tree max_index = NULL_TREE;
4997 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4999 if (TYPE_DOMAIN (type))
5000 max_index = array_type_nelts (type);
5002 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5005 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5006 Parameters are the same of reshape_init_r. */
5009 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5011 tree max_index = NULL_TREE;
5013 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5015 if (COMPOUND_LITERAL_P (d->cur->value))
5017 tree value = d->cur->value;
5018 if (!same_type_p (TREE_TYPE (value), type))
5020 if (complain & tf_error)
5021 error ("invalid type %qT as initializer for a vector of type %qT",
5022 TREE_TYPE (d->cur->value), type);
5023 value = error_mark_node;
5029 /* For a vector, we initialize it as an array of the appropriate size. */
5030 if (TREE_CODE (type) == VECTOR_TYPE)
5031 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5033 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5036 /* Subroutine of reshape_init_r, processes the initializers for classes
5037 or union. Parameters are the same of reshape_init_r. */
5040 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5041 tsubst_flags_t complain)
5046 gcc_assert (CLASS_TYPE_P (type));
5048 /* The initializer for a class is always a CONSTRUCTOR. */
5049 new_init = build_constructor (init_list_type_node, NULL);
5050 field = next_initializable_field (TYPE_FIELDS (type));
5056 An initializer for an aggregate member that is an
5057 empty class shall have the form of an empty
5058 initializer-list {}. */
5059 if (!first_initializer_p)
5061 if (complain & tf_error)
5062 error ("initializer for %qT must be brace-enclosed", type);
5063 return error_mark_node;
5068 /* Loop through the initializable fields, gathering initializers. */
5069 while (d->cur != d->end)
5073 /* Handle designated initializers, as an extension. */
5076 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5078 if (!field || TREE_CODE (field) != FIELD_DECL)
5080 if (complain & tf_error)
5081 error ("%qT has no non-static data member named %qD", type,
5083 return error_mark_node;
5087 /* If we processed all the member of the class, we are done. */
5091 field_init = reshape_init_r (TREE_TYPE (field), d,
5092 /*first_initializer_p=*/false, complain);
5093 if (field_init == error_mark_node)
5094 return error_mark_node;
5096 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5100 When a union is initialized with a brace-enclosed
5101 initializer, the braces shall only contain an
5102 initializer for the first member of the union. */
5103 if (TREE_CODE (type) == UNION_TYPE)
5106 field = next_initializable_field (DECL_CHAIN (field));
5112 /* Subroutine of reshape_init, which processes a single initializer (part of
5113 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5114 iterator within the CONSTRUCTOR which points to the initializer to process.
5115 FIRST_INITIALIZER_P is true if this is the first initializer of the
5116 outermost CONSTRUCTOR node. */
5119 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5120 tsubst_flags_t complain)
5122 tree init = d->cur->value;
5124 if (error_operand_p (init))
5125 return error_mark_node;
5127 if (TREE_CODE (type) == COMPLEX_TYPE)
5129 /* A complex type can be initialized from one or two initializers,
5130 but braces are not elided. */
5132 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5134 if (CONSTRUCTOR_NELTS (init) > 2)
5136 if (complain & tf_error)
5137 error ("too many initializers for %qT", type);
5139 return error_mark_node;
5142 else if (first_initializer_p && d->cur != d->end)
5144 VEC(constructor_elt, gc) *v = 0;
5145 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5146 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5148 init = build_constructor (init_list_type_node, v);
5153 /* A non-aggregate type is always initialized with a single
5155 if (!CP_AGGREGATE_TYPE_P (type))
5157 /* It is invalid to initialize a non-aggregate type with a
5158 brace-enclosed initializer before C++0x.
5159 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5160 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5161 a CONSTRUCTOR (with a record type). */
5162 if (TREE_CODE (init) == CONSTRUCTOR
5163 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5165 if (SCALAR_TYPE_P (type))
5167 if (complain & tf_error)
5168 error ("braces around scalar initializer for type %qT", type);
5169 init = error_mark_node;
5172 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5181 All implicit type conversions (clause _conv_) are considered when
5182 initializing the aggregate member with an initializer from an
5183 initializer-list. If the initializer can initialize a member,
5184 the member is initialized. Otherwise, if the member is itself a
5185 non-empty subaggregate, brace elision is assumed and the
5186 initializer is considered for the initialization of the first
5187 member of the subaggregate. */
5188 if (TREE_CODE (init) != CONSTRUCTOR
5189 /* But don't try this for the first initializer, since that would be
5190 looking through the outermost braces; A a2 = { a1 }; is not a
5191 valid aggregate initialization. */
5192 && !first_initializer_p
5193 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5194 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5200 /* [dcl.init.string]
5202 A char array (whether plain char, signed char, or unsigned char)
5203 can be initialized by a string-literal (optionally enclosed in
5204 braces); a wchar_t array can be initialized by a wide
5205 string-literal (optionally enclosed in braces). */
5206 if (TREE_CODE (type) == ARRAY_TYPE
5207 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5209 tree str_init = init;
5211 /* Strip one level of braces if and only if they enclose a single
5212 element (as allowed by [dcl.init.string]). */
5213 if (!first_initializer_p
5214 && TREE_CODE (str_init) == CONSTRUCTOR
5215 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5217 str_init = VEC_index (constructor_elt,
5218 CONSTRUCTOR_ELTS (str_init), 0)->value;
5221 /* If it's a string literal, then it's the initializer for the array
5222 as a whole. Otherwise, continue with normal initialization for
5223 array types (one value per array element). */
5224 if (TREE_CODE (str_init) == STRING_CST)
5231 /* The following cases are about aggregates. If we are not within a full
5232 initializer already, and there is not a CONSTRUCTOR, it means that there
5233 is a missing set of braces (that is, we are processing the case for
5234 which reshape_init exists). */
5235 if (!first_initializer_p)
5237 if (TREE_CODE (init) == CONSTRUCTOR)
5239 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5240 /* There is no need to reshape pointer-to-member function
5241 initializers, as they are always constructed correctly
5242 by the front end. */
5244 else if (COMPOUND_LITERAL_P (init))
5245 /* For a nested compound literal, there is no need to reshape since
5246 brace elision is not allowed. Even if we decided to allow it,
5247 we should add a call to reshape_init in finish_compound_literal,
5248 before calling digest_init, so changing this code would still
5249 not be necessary. */
5250 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5254 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5255 return reshape_init (type, init, complain);
5259 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5263 /* Dispatch to specialized routines. */
5264 if (CLASS_TYPE_P (type))
5265 return reshape_init_class (type, d, first_initializer_p, complain);
5266 else if (TREE_CODE (type) == ARRAY_TYPE)
5267 return reshape_init_array (type, d, complain);
5268 else if (TREE_CODE (type) == VECTOR_TYPE)
5269 return reshape_init_vector (type, d, complain);
5274 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5275 brace-enclosed aggregate initializer.
5277 INIT is the CONSTRUCTOR containing the list of initializers describing
5278 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5279 It may not presently match the shape of the TYPE; for example:
5281 struct S { int a; int b; };
5282 struct S a[] = { 1, 2, 3, 4 };
5284 Here INIT will hold a VEC of four elements, rather than a
5285 VEC of two elements, each itself a VEC of two elements. This
5286 routine transforms INIT from the former form into the latter. The
5287 revised CONSTRUCTOR node is returned. */
5290 reshape_init (tree type, tree init, tsubst_flags_t complain)
5292 VEC(constructor_elt, gc) *v;
5296 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5298 v = CONSTRUCTOR_ELTS (init);
5300 /* An empty constructor does not need reshaping, and it is always a valid
5302 if (VEC_empty (constructor_elt, v))
5305 /* Recurse on this CONSTRUCTOR. */
5306 d.cur = VEC_index (constructor_elt, v, 0);
5307 d.end = d.cur + VEC_length (constructor_elt, v);
5309 new_init = reshape_init_r (type, &d, true, complain);
5310 if (new_init == error_mark_node)
5311 return error_mark_node;
5313 /* Make sure all the element of the constructor were used. Otherwise,
5314 issue an error about exceeding initializers. */
5317 if (complain & tf_error)
5318 error ("too many initializers for %qT", type);
5320 return error_mark_node;
5326 /* Verify array initializer. Returns true if errors have been reported. */
5329 check_array_initializer (tree decl, tree type, tree init)
5331 tree element_type = TREE_TYPE (type);
5333 /* The array type itself need not be complete, because the
5334 initializer may tell us how many elements are in the array.
5335 But, the elements of the array must be complete. */
5336 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5339 error ("elements of array %q#D have incomplete type", decl);
5341 error ("elements of array %q#T have incomplete type", type);
5344 /* It is not valid to initialize a VLA. */
5346 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5347 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5350 error ("variable-sized object %qD may not be initialized", decl);
5352 error ("variable-sized compound literal");
5358 /* Subroutine of check_initializer; args are passed down from that function.
5359 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5362 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5365 int saved_stmts_are_full_exprs_p = 0;
5366 if (building_stmt_list_p ())
5368 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5369 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5371 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5372 if (building_stmt_list_p ())
5373 current_stmt_tree ()->stmts_are_full_exprs_p =
5374 saved_stmts_are_full_exprs_p;
5378 /* Verify INIT (the initializer for DECL), and record the
5379 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5380 grok_reference_init.
5382 If the return value is non-NULL, it is an expression that must be
5383 evaluated dynamically to initialize DECL. */
5386 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5388 tree type = TREE_TYPE (decl);
5389 tree init_code = NULL;
5390 tree extra_init = NULL_TREE;
5393 /* Things that are going to be initialized need to have complete
5395 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5397 if (DECL_HAS_VALUE_EXPR_P (decl))
5399 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5400 it doesn't have storage to be initialized. */
5401 gcc_assert (init == NULL_TREE);
5405 if (type == error_mark_node)
5406 /* We will have already complained. */
5409 if (TREE_CODE (type) == ARRAY_TYPE)
5411 if (check_array_initializer (decl, type, init))
5414 else if (!COMPLETE_TYPE_P (type))
5416 error ("%qD has incomplete type", decl);
5417 TREE_TYPE (decl) = error_mark_node;
5421 /* There is no way to make a variable-sized class type in GNU C++. */
5422 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5424 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5426 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5427 if (SCALAR_TYPE_P (type))
5431 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5432 init = build_zero_init (type, NULL_TREE, false);
5434 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5436 error ("scalar object %qD requires one element in initializer",
5438 TREE_TYPE (decl) = error_mark_node;
5444 if (TREE_CODE (decl) == CONST_DECL)
5446 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5448 DECL_INITIAL (decl) = init;
5450 gcc_assert (init != NULL_TREE);
5453 else if (!init && DECL_REALLY_EXTERN (decl))
5455 else if (init || type_build_ctor_call (type)
5456 || TREE_CODE (type) == REFERENCE_TYPE)
5458 if (TREE_CODE (type) == REFERENCE_TYPE)
5460 init = grok_reference_init (decl, type, init, flags);
5461 flags |= LOOKUP_ALREADY_DIGESTED;
5464 check_for_uninitialized_const_var (decl);
5465 /* Do not reshape constructors of vectors (they don't need to be
5467 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5469 if (is_std_init_list (type))
5471 init = perform_implicit_conversion (type, init,
5472 tf_warning_or_error);
5473 flags |= LOOKUP_ALREADY_DIGESTED;
5475 else if (TYPE_NON_AGGREGATE_CLASS (type))
5477 /* Don't reshape if the class has constructors. */
5478 if (cxx_dialect == cxx98)
5479 error ("in C++98 %qD must be initialized by constructor, "
5483 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5485 error ("opaque vector types cannot be initialized");
5486 init = error_mark_node;
5490 init = reshape_init (type, init, tf_warning_or_error);
5491 if (SCALAR_TYPE_P (type))
5492 check_narrowing (type, init);
5496 /* If DECL has an array type without a specific bound, deduce the
5497 array size from the initializer. */
5498 maybe_deduce_size_from_array_init (decl, init);
5499 type = TREE_TYPE (decl);
5500 if (type == error_mark_node)
5503 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5504 && !(flags & LOOKUP_ALREADY_DIGESTED)
5505 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5506 && CP_AGGREGATE_TYPE_P (type)))
5508 init_code = build_aggr_init_full_exprs (decl, init, flags);
5510 /* If this is a constexpr initializer, expand_default_init will
5511 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5512 case, pull the initializer back out and pass it down into
5513 store_init_value. */
5514 while (TREE_CODE (init_code) == EXPR_STMT
5515 || TREE_CODE (init_code) == CONVERT_EXPR)
5516 init_code = TREE_OPERAND (init_code, 0);
5517 if (TREE_CODE (init_code) == INIT_EXPR)
5519 init = TREE_OPERAND (init_code, 1);
5520 init_code = NULL_TREE;
5521 /* Don't call digest_init; it's unnecessary and will complain
5522 about aggregate initialization of non-aggregate classes. */
5523 flags |= LOOKUP_ALREADY_DIGESTED;
5525 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5527 /* Declared constexpr, but no suitable initializer; massage
5528 init appropriately so we can pass it into store_init_value
5530 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5531 init = finish_compound_literal (type, init,
5532 tf_warning_or_error);
5533 else if (CLASS_TYPE_P (type)
5534 && (!init || TREE_CODE (init) == TREE_LIST))
5536 init = build_functional_cast (type, init, tf_none);
5537 if (init != error_mark_node)
5538 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5540 init_code = NULL_TREE;
5546 if (init && TREE_CODE (init) != TREE_VEC)
5548 init_code = store_init_value (decl, init, cleanups, flags);
5549 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5550 && DECL_INITIAL (decl)
5551 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5552 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5553 warning (0, "array %qD initialized by parenthesized string literal %qE",
5554 decl, DECL_INITIAL (decl));
5560 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5561 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5562 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5563 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5566 check_for_uninitialized_const_var (decl);
5569 if (init && init != error_mark_node)
5570 init_code = build2 (INIT_EXPR, type, decl, init);
5573 init_code = add_stmt_to_compound (extra_init, init_code);
5575 if (init_code && DECL_IN_AGGR_P (decl))
5577 static int explained = 0;
5579 if (cxx_dialect < cxx0x)
5580 error ("initializer invalid for static member with constructor");
5582 error ("non-constant in-class initialization invalid for static "
5583 "member %qD", decl);
5586 error ("(an out of class initialization is required)");
5594 /* If DECL is not a local variable, give it RTL. */
5597 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5599 int toplev = toplevel_bindings_p ();
5601 const char *filename;
5603 /* Set the DECL_ASSEMBLER_NAME for the object. */
5606 /* The `register' keyword, when used together with an
5607 asm-specification, indicates that the variable should be
5608 placed in a particular register. */
5609 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5611 set_user_assembler_name (decl, asmspec);
5612 DECL_HARD_REGISTER (decl) = 1;
5616 if (TREE_CODE (decl) == FUNCTION_DECL
5617 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5618 set_builtin_user_assembler_name (decl, asmspec);
5619 set_user_assembler_name (decl, asmspec);
5623 /* Handle non-variables up front. */
5624 if (TREE_CODE (decl) != VAR_DECL)
5626 rest_of_decl_compilation (decl, toplev, at_eof);
5630 /* If we see a class member here, it should be a static data
5632 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5634 gcc_assert (TREE_STATIC (decl));
5635 /* An in-class declaration of a static data member should be
5636 external; it is only a declaration, and not a definition. */
5637 if (init == NULL_TREE)
5638 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5641 /* We don't create any RTL for local variables. */
5642 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5645 /* We defer emission of local statics until the corresponding
5646 DECL_EXPR is expanded. */
5647 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5649 /* We try to defer namespace-scope static constants so that they are
5650 not emitted into the object file unnecessarily. */
5651 filename = input_filename;
5652 if (!DECL_VIRTUAL_P (decl)
5653 && TREE_READONLY (decl)
5654 && DECL_INITIAL (decl) != NULL_TREE
5655 && DECL_INITIAL (decl) != error_mark_node
5657 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5659 && !TREE_PUBLIC (decl))
5661 /* Fool with the linkage of static consts according to #pragma
5663 struct c_fileinfo *finfo = get_fileinfo (filename);
5664 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5666 TREE_PUBLIC (decl) = 1;
5667 DECL_EXTERNAL (decl) = finfo->interface_only;
5672 /* Likewise for template instantiations. */
5673 else if (DECL_LANG_SPECIFIC (decl)
5674 && DECL_IMPLICIT_INSTANTIATION (decl))
5677 /* If we're not deferring, go ahead and assemble the variable. */
5679 rest_of_decl_compilation (decl, toplev, at_eof);
5682 /* walk_tree helper for wrap_temporary_cleanups, below. */
5685 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5687 /* Stop at types or full-expression boundaries. */
5688 if (TYPE_P (*stmt_p)
5689 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5695 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5697 tree guard = (tree)data;
5698 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5700 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5701 /* Tell honor_protect_cleanup_actions to handle this as a separate
5703 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5705 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5711 /* We're initializing a local variable which has a cleanup GUARD. If there
5712 are any temporaries used in the initializer INIT of this variable, we
5713 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5714 variable will be cleaned up properly if one of them throws.
5716 Unfortunately, there's no way to express this properly in terms of
5717 nesting, as the regions for the temporaries overlap the region for the
5718 variable itself; if there are two temporaries, the variable needs to be
5719 the first thing destroyed if either of them throws. However, we only
5720 want to run the variable's cleanup if it actually got constructed. So
5721 we need to guard the temporary cleanups with the variable's cleanup if
5722 they are run on the normal path, but not if they are run on the
5723 exceptional path. We implement this by telling
5724 honor_protect_cleanup_actions to strip the variable cleanup from the
5725 exceptional path. */
5728 wrap_temporary_cleanups (tree init, tree guard)
5730 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5733 /* Generate code to initialize DECL (a local variable). */
5736 initialize_local_var (tree decl, tree init)
5738 tree type = TREE_TYPE (decl);
5742 gcc_assert (TREE_CODE (decl) == VAR_DECL
5743 || TREE_CODE (decl) == RESULT_DECL);
5744 gcc_assert (!TREE_STATIC (decl));
5746 if (DECL_SIZE (decl) == NULL_TREE)
5748 /* If we used it already as memory, it must stay in memory. */
5749 DECL_INITIAL (decl) = NULL_TREE;
5750 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5754 if (type == error_mark_node)
5757 /* Compute and store the initial value. */
5758 already_used = TREE_USED (decl) || TREE_USED (type);
5759 if (TREE_USED (type))
5760 DECL_READ_P (decl) = 1;
5762 /* Generate a cleanup, if necessary. */
5763 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5765 /* Perform the initialization. */
5768 if (TREE_CODE (init) == INIT_EXPR
5769 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5771 /* Stick simple initializers in DECL_INITIAL so that
5772 -Wno-init-self works (c++/34772). */
5773 gcc_assert (TREE_OPERAND (init, 0) == decl);
5774 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5778 int saved_stmts_are_full_exprs_p;
5780 /* If we're only initializing a single object, guard the
5781 destructors of any temporaries used in its initializer with
5782 its destructor. This isn't right for arrays because each
5783 element initialization is a full-expression. */
5784 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5785 wrap_temporary_cleanups (init, cleanup);
5787 gcc_assert (building_stmt_list_p ());
5788 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5789 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5790 finish_expr_stmt (init);
5791 current_stmt_tree ()->stmts_are_full_exprs_p =
5792 saved_stmts_are_full_exprs_p;
5796 /* Set this to 0 so we can tell whether an aggregate which was
5797 initialized was ever used. Don't do this if it has a
5798 destructor, so we don't complain about the 'resource
5799 allocation is initialization' idiom. Now set
5800 attribute((unused)) on types so decls of that type will be
5801 marked used. (see TREE_USED, above.) */
5802 if (TYPE_NEEDS_CONSTRUCTING (type)
5804 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5805 && DECL_NAME (decl))
5806 TREE_USED (decl) = 0;
5807 else if (already_used)
5808 TREE_USED (decl) = 1;
5811 finish_decl_cleanup (decl, cleanup);
5814 /* DECL is a VAR_DECL for a compiler-generated variable with static
5815 storage duration (like a virtual table) whose initializer is a
5816 compile-time constant. Initialize the variable and provide it to the
5820 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5823 gcc_assert (DECL_ARTIFICIAL (decl));
5824 init = build_constructor (TREE_TYPE (decl), v);
5825 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5826 DECL_INITIAL (decl) = init;
5827 DECL_INITIALIZED_P (decl) = 1;
5828 determine_visibility (decl);
5829 layout_var_decl (decl);
5830 maybe_commonize_var (decl);
5831 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5834 /* INIT is the initializer for a variable, as represented by the
5835 parser. Returns true iff INIT is type-dependent. */
5838 type_dependent_init_p (tree init)
5840 if (TREE_CODE (init) == TREE_LIST)
5841 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5842 return any_type_dependent_elements_p (init);
5843 else if (TREE_CODE (init) == CONSTRUCTOR)
5844 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5846 VEC(constructor_elt, gc) *elts;
5850 elts = CONSTRUCTOR_ELTS (init);
5851 nelts = VEC_length (constructor_elt, elts);
5852 for (i = 0; i < nelts; ++i)
5853 if (type_dependent_init_p (VEC_index (constructor_elt,
5858 /* It must be a simple expression, e.g., int i = 3; */
5859 return type_dependent_expression_p (init);
5864 /* INIT is the initializer for a variable, as represented by the
5865 parser. Returns true iff INIT is value-dependent. */
5868 value_dependent_init_p (tree init)
5870 if (TREE_CODE (init) == TREE_LIST)
5871 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5872 return any_value_dependent_elements_p (init);
5873 else if (TREE_CODE (init) == CONSTRUCTOR)
5874 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5876 VEC(constructor_elt, gc) *elts;
5880 elts = CONSTRUCTOR_ELTS (init);
5881 nelts = VEC_length (constructor_elt, elts);
5882 for (i = 0; i < nelts; ++i)
5883 if (value_dependent_init_p (VEC_index (constructor_elt,
5888 /* It must be a simple expression, e.g., int i = 3; */
5889 return value_dependent_expression_p (init);
5894 /* Finish processing of a declaration;
5895 install its line number and initial value.
5896 If the length of an array type is not known before,
5897 it must be determined now, from the initial value, or it is an error.
5899 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5900 true, then INIT is an integral constant expression.
5902 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5903 if the (init) syntax was used. */
5906 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5907 tree asmspec_tree, int flags)
5910 VEC(tree,gc) *cleanups = make_tree_vector ();
5912 const char *asmspec = NULL;
5913 int was_readonly = 0;
5914 bool var_definition_p = false;
5917 if (decl == error_mark_node)
5922 error ("assignment (not initialization) in declaration");
5926 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5927 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5928 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5930 type = TREE_TYPE (decl);
5931 if (type == error_mark_node)
5934 /* If a name was specified, get the string. */
5935 if (at_namespace_scope_p ())
5936 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5937 if (asmspec_tree && asmspec_tree != error_mark_node)
5938 asmspec = TREE_STRING_POINTER (asmspec_tree);
5940 if (current_class_type
5941 && CP_DECL_CONTEXT (decl) == current_class_type
5942 && TYPE_BEING_DEFINED (current_class_type)
5943 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5944 && (DECL_INITIAL (decl) || init))
5945 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5947 auto_node = type_uses_auto (type);
5951 if (init == NULL_TREE)
5953 error ("declaration of %q#D has no initializer", decl);
5954 TREE_TYPE (decl) = error_mark_node;
5958 if (TREE_CODE (d_init) == TREE_LIST)
5959 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5960 tf_warning_or_error);
5961 d_init = resolve_nondeduced_context (d_init);
5962 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5964 if (type == error_mark_node)
5968 if (!ensure_literal_type_for_constexpr_object (decl))
5969 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5971 if (TREE_CODE (decl) == VAR_DECL
5972 && DECL_CLASS_SCOPE_P (decl)
5973 && DECL_INITIALIZED_IN_CLASS_P (decl))
5974 check_static_variable_definition (decl, type);
5976 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5979 if (init == ridpointers[(int)RID_DELETE])
5981 /* FIXME check this is 1st decl. */
5982 DECL_DELETED_FN (decl) = 1;
5983 DECL_DECLARED_INLINE_P (decl) = 1;
5984 DECL_INITIAL (decl) = error_mark_node;
5985 FOR_EACH_CLONE (clone, decl)
5987 DECL_DELETED_FN (clone) = 1;
5988 DECL_DECLARED_INLINE_P (clone) = 1;
5989 DECL_INITIAL (clone) = error_mark_node;
5993 else if (init == ridpointers[(int)RID_DEFAULT])
5995 if (defaultable_fn_check (decl))
5996 DECL_DEFAULTED_FN (decl) = 1;
5998 DECL_INITIAL (decl) = NULL_TREE;
6002 if (init && TREE_CODE (decl) == VAR_DECL)
6004 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6005 /* If DECL is a reference, then we want to know whether init is a
6006 reference constant; init_const_expr_p as passed tells us whether
6007 it's an rvalue constant. */
6008 if (TREE_CODE (type) == REFERENCE_TYPE)
6009 init_const_expr_p = potential_constant_expression (init);
6010 if (init_const_expr_p)
6012 /* Set these flags now for templates. We'll update the flags in
6013 store_init_value for instantiations. */
6014 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6015 if (decl_maybe_constant_var_p (decl))
6016 TREE_CONSTANT (decl) = 1;
6020 if (processing_template_decl)
6022 bool type_dependent_p;
6024 /* Add this declaration to the statement-tree. */
6025 if (at_function_scope_p ())
6026 add_decl_expr (decl);
6028 type_dependent_p = dependent_type_p (type);
6030 if (check_for_bare_parameter_packs (init))
6033 DECL_INITIAL (decl) = NULL_TREE;
6036 /* Generally, initializers in templates are expanded when the
6037 template is instantiated. But, if DECL is a variable constant
6038 then it can be used in future constant expressions, so its value
6039 must be available. */
6041 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6042 /* We can't do anything if the decl has dependent type. */;
6044 && init_const_expr_p
6045 && !type_dependent_p
6046 && decl_maybe_constant_var_p (decl)
6047 && !type_dependent_init_p (init)
6048 && !value_dependent_init_p (init))
6050 /* This variable seems to be a non-dependent constant, so process
6051 its initializer. If check_initializer returns non-null the
6052 initialization wasn't constant after all. */
6053 tree init_code = check_initializer (decl, init, flags, &cleanups);
6054 if (init_code == NULL_TREE)
6057 else if (!DECL_PRETTY_FUNCTION_P (decl))
6058 /* Deduce array size even if the initializer is dependent. */
6059 maybe_deduce_size_from_array_init (decl, init);
6062 DECL_INITIAL (decl) = init;
6066 /* Just store non-static data member initializers for later. */
6067 if (init && TREE_CODE (decl) == FIELD_DECL)
6068 DECL_INITIAL (decl) = init;
6070 /* Take care of TYPE_DECLs up front. */
6071 if (TREE_CODE (decl) == TYPE_DECL)
6073 if (type != error_mark_node
6074 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6076 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6077 warning (0, "shadowing previous type declaration of %q#D", decl);
6078 set_identifier_type_value (DECL_NAME (decl), decl);
6081 /* If we have installed this as the canonical typedef for this
6082 type, and that type has not been defined yet, delay emitting
6083 the debug information for it, as we will emit it later. */
6084 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6085 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6086 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6088 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6093 /* A reference will be modified here, as it is initialized. */
6094 if (! DECL_EXTERNAL (decl)
6095 && TREE_READONLY (decl)
6096 && TREE_CODE (type) == REFERENCE_TYPE)
6099 TREE_READONLY (decl) = 0;
6102 if (TREE_CODE (decl) == VAR_DECL)
6104 /* Only variables with trivial initialization and destruction can
6105 have thread-local storage. */
6106 if (DECL_THREAD_LOCAL_P (decl)
6107 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6108 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6109 error ("%qD cannot be thread-local because it has non-trivial "
6110 "type %qT", decl, TREE_TYPE (decl));
6111 /* If this is a local variable that will need a mangled name,
6112 register it now. We must do this before processing the
6113 initializer for the variable, since the initialization might
6114 require a guard variable, and since the mangled name of the
6115 guard variable will depend on the mangled name of this
6117 if (DECL_FUNCTION_SCOPE_P (decl)
6118 && TREE_STATIC (decl)
6119 && !DECL_ARTIFICIAL (decl))
6121 push_local_name (decl);
6122 if (DECL_CONSTRUCTOR_P (current_function_decl)
6123 || DECL_DESTRUCTOR_P (current_function_decl))
6124 /* Normally local_decls is populated during GIMPLE lowering,
6125 but [cd]tors are never actually compiled directly. We need
6126 to put statics on the list so we can deal with the label
6127 address extension. */
6128 add_local_decl (cfun, decl);
6131 /* Convert the initializer to the type of DECL, if we have not
6132 already initialized DECL. */
6133 if (!DECL_INITIALIZED_P (decl)
6134 /* If !DECL_EXTERNAL then DECL is being defined. In the
6135 case of a static data member initialized inside the
6136 class-specifier, there can be an initializer even if DECL
6137 is *not* defined. */
6138 && (!DECL_EXTERNAL (decl) || init))
6140 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6143 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6144 /* Allow libjava/prims.cc define primitive classes. */
6145 if (init != NULL_TREE
6146 || jclass == NULL_TREE
6147 || TREE_CODE (jclass) != TYPE_DECL
6148 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6149 || !same_type_ignoring_top_level_qualifiers_p
6150 (type, TREE_TYPE (TREE_TYPE (jclass))))
6151 error ("Java object %qD not allocated with %<new%>", decl);
6154 init = check_initializer (decl, init, flags, &cleanups);
6155 /* Thread-local storage cannot be dynamically initialized. */
6156 if (DECL_THREAD_LOCAL_P (decl) && init)
6158 error ("%qD is thread-local and so cannot be dynamically "
6159 "initialized", decl);
6163 /* Check that the initializer for a static data member was a
6164 constant. Although we check in the parser that the
6165 initializer is an integral constant expression, we do not
6166 simplify division-by-zero at the point at which it
6167 occurs. Therefore, in:
6169 struct S { static const int i = 7 / 0; };
6171 we issue an error at this point. It would
6172 probably be better to forbid division by zero in
6173 integral constant expressions. */
6174 if (DECL_EXTERNAL (decl) && init)
6176 error ("%qD cannot be initialized by a non-constant expression"
6177 " when being declared", decl);
6178 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6186 The memory occupied by any object of static storage
6187 duration is zero-initialized at program startup before
6188 any other initialization takes place.
6190 We cannot create an appropriate initializer until after
6191 the type of DECL is finalized. If DECL_INITIAL is set,
6192 then the DECL is statically initialized, and any
6193 necessary zero-initialization has already been performed. */
6194 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6195 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6196 /*nelts=*/NULL_TREE,
6197 /*static_storage_p=*/true);
6198 /* Remember that the initialization for this variable has
6200 DECL_INITIALIZED_P (decl) = 1;
6201 /* This declaration is the definition of this variable,
6202 unless we are initializing a static data member within
6203 the class specifier. */
6204 if (!DECL_EXTERNAL (decl))
6205 var_definition_p = true;
6207 /* If the variable has an array type, lay out the type, even if
6208 there is no initializer. It is valid to index through the
6209 array, and we must get TYPE_ALIGN set correctly on the array
6211 else if (TREE_CODE (type) == ARRAY_TYPE)
6214 if (TREE_STATIC (decl)
6215 && !at_function_scope_p ()
6216 && current_function_decl == NULL)
6217 /* So decl is a global variable or a static member of a
6218 non local class. Record the types it uses
6219 so that we can decide later to emit debug info for them. */
6220 record_types_used_by_current_var_decl (decl);
6222 else if (TREE_CODE (decl) == FIELD_DECL
6223 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6224 error ("non-static data member %qD has Java class type", decl);
6226 /* Add this declaration to the statement-tree. This needs to happen
6227 after the call to check_initializer so that the DECL_EXPR for a
6228 reference temp is added before the DECL_EXPR for the reference itself. */
6229 if (DECL_FUNCTION_SCOPE_P (decl))
6230 add_decl_expr (decl);
6232 /* Let the middle end know about variables and functions -- but not
6233 static data members in uninstantiated class templates. */
6234 if (TREE_CODE (decl) == VAR_DECL
6235 || TREE_CODE (decl) == FUNCTION_DECL)
6237 if (TREE_CODE (decl) == VAR_DECL)
6239 layout_var_decl (decl);
6240 maybe_commonize_var (decl);
6243 /* This needs to happen after the linkage is set. */
6244 determine_visibility (decl);
6246 if (var_definition_p && TREE_STATIC (decl))
6248 /* If a TREE_READONLY variable needs initialization
6249 at runtime, it is no longer readonly and we need to
6250 avoid MEM_READONLY_P being set on RTL created for it. */
6253 if (TREE_READONLY (decl))
6254 TREE_READONLY (decl) = 0;
6257 else if (was_readonly)
6258 TREE_READONLY (decl) = 1;
6261 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6263 /* Check for abstractness of the type. Notice that there is no
6264 need to strip array types here since the check for those types
6265 is already done within create_array_type_for_decl. */
6266 if (TREE_CODE (type) == FUNCTION_TYPE
6267 || TREE_CODE (type) == METHOD_TYPE)
6268 abstract_virtuals_error (decl, TREE_TYPE (type));
6270 abstract_virtuals_error (decl, type);
6272 if (TREE_TYPE (decl) == error_mark_node)
6273 /* No initialization required. */
6275 else if (TREE_CODE (decl) == FUNCTION_DECL)
6279 if (init == ridpointers[(int)RID_DEFAULT])
6281 /* An out-of-class default definition is defined at
6282 the point where it is explicitly defaulted. */
6283 if (DECL_DELETED_FN (decl))
6284 maybe_explain_implicit_delete (decl);
6285 else if (DECL_INITIAL (decl) == error_mark_node)
6286 synthesize_method (decl);
6289 error ("function %q#D is initialized like a variable", decl);
6291 /* else no initialization required. */
6293 else if (DECL_EXTERNAL (decl)
6294 && ! (DECL_LANG_SPECIFIC (decl)
6295 && DECL_NOT_REALLY_EXTERN (decl)))
6298 DECL_INITIAL (decl) = init;
6300 /* A variable definition. */
6301 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6302 /* Initialize the local variable. */
6303 initialize_local_var (decl, init);
6305 /* If a variable is defined, and then a subsequent
6306 definition with external linkage is encountered, we will
6307 get here twice for the same variable. We want to avoid
6308 calling expand_static_init more than once. For variables
6309 that are not static data members, we can call
6310 expand_static_init only when we actually process the
6311 initializer. It is not legal to redeclare a static data
6312 member, so this issue does not arise in that case. */
6313 else if (var_definition_p && TREE_STATIC (decl))
6314 expand_static_init (decl, init);
6317 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6318 reference, insert it in the statement-tree now. */
6319 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6320 push_cleanup (decl, t, false);
6321 release_tree_vector (cleanups);
6324 TREE_READONLY (decl) = 1;
6326 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6329 /* Returns a declaration for a VAR_DECL as if:
6331 extern "C" TYPE NAME;
6333 had been seen. Used to create compiler-generated global
6337 declare_global_var (tree name, tree type)
6341 push_to_top_level ();
6342 decl = build_decl (input_location, VAR_DECL, name, type);
6343 TREE_PUBLIC (decl) = 1;
6344 DECL_EXTERNAL (decl) = 1;
6345 DECL_ARTIFICIAL (decl) = 1;
6346 /* If the user has explicitly declared this variable (perhaps
6347 because the code we are compiling is part of a low-level runtime
6348 library), then it is possible that our declaration will be merged
6349 with theirs by pushdecl. */
6350 decl = pushdecl (decl);
6351 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6352 pop_from_top_level ();
6357 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6358 if "__cxa_atexit" is not being used) corresponding to the function
6359 to be called when the program exits. */
6362 get_atexit_fn_ptr_type (void)
6366 if (!atexit_fn_ptr_type_node)
6369 if (flag_use_cxa_atexit
6370 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6371 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6372 arg_type = ptr_type_node;
6374 /* The parameter to "atexit" is "void (*)(void)". */
6375 arg_type = NULL_TREE;
6377 fn_type = build_function_type_list (void_type_node,
6378 arg_type, NULL_TREE);
6379 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6382 return atexit_fn_ptr_type_node;
6385 /* Returns a pointer to the `atexit' function. Note that if
6386 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6387 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6390 get_atexit_node (void)
6396 bool use_aeabi_atexit;
6401 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6403 /* The declaration for `__cxa_atexit' is:
6405 int __cxa_atexit (void (*)(void *), void *, void *)
6407 We build up the argument types and then the function type
6409 tree argtype0, argtype1, argtype2;
6411 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6412 /* First, build the pointer-to-function type for the first
6414 fn_ptr_type = get_atexit_fn_ptr_type ();
6415 /* Then, build the rest of the argument types. */
6416 argtype2 = ptr_type_node;
6417 if (use_aeabi_atexit)
6419 argtype1 = fn_ptr_type;
6420 argtype0 = ptr_type_node;
6424 argtype1 = ptr_type_node;
6425 argtype0 = fn_ptr_type;
6427 /* And the final __cxa_atexit type. */
6428 fn_type = build_function_type_list (integer_type_node,
6429 argtype0, argtype1, argtype2,
6431 fn_ptr_type = build_pointer_type (fn_type);
6432 if (use_aeabi_atexit)
6433 name = "__aeabi_atexit";
6435 name = "__cxa_atexit";
6439 /* The declaration for `atexit' is:
6441 int atexit (void (*)());
6443 We build up the argument types and then the function type
6445 fn_ptr_type = get_atexit_fn_ptr_type ();
6446 /* Build the final atexit type. */
6447 fn_type = build_function_type_list (integer_type_node,
6448 fn_ptr_type, NULL_TREE);
6452 /* Now, build the function declaration. */
6453 push_lang_context (lang_name_c);
6454 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6455 mark_used (atexit_fndecl);
6456 pop_lang_context ();
6457 atexit_node = decay_conversion (atexit_fndecl);
6462 /* Returns the __dso_handle VAR_DECL. */
6465 get_dso_handle_node (void)
6467 if (dso_handle_node)
6468 return dso_handle_node;
6470 /* Declare the variable. */
6471 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6474 #ifdef HAVE_GAS_HIDDEN
6475 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6476 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6479 return dso_handle_node;
6482 /* Begin a new function with internal linkage whose job will be simply
6483 to destroy some particular variable. */
6485 static GTY(()) int start_cleanup_cnt;
6488 start_cleanup_fn (void)
6493 bool use_cxa_atexit = flag_use_cxa_atexit
6494 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6496 push_to_top_level ();
6498 /* No need to mangle this. */
6499 push_lang_context (lang_name_c);
6501 /* Build the name of the function. */
6502 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6503 /* Build the function declaration. */
6504 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6505 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6506 /* It's a function with internal linkage, generated by the
6508 TREE_PUBLIC (fndecl) = 0;
6509 DECL_ARTIFICIAL (fndecl) = 1;
6510 /* Make the function `inline' so that it is only emitted if it is
6511 actually needed. It is unlikely that it will be inlined, since
6512 it is only called via a function pointer, but we avoid unnecessary
6513 emissions this way. */
6514 DECL_DECLARED_INLINE_P (fndecl) = 1;
6515 DECL_INTERFACE_KNOWN (fndecl) = 1;
6516 /* Build the parameter. */
6521 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6522 DECL_CONTEXT (parmdecl) = fndecl;
6523 TREE_USED (parmdecl) = 1;
6524 DECL_READ_P (parmdecl) = 1;
6525 DECL_ARGUMENTS (fndecl) = parmdecl;
6529 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6531 pop_lang_context ();
6533 return current_function_decl;
6536 /* Finish the cleanup function begun by start_cleanup_fn. */
6539 end_cleanup_fn (void)
6541 expand_or_defer_fn (finish_function (0));
6543 pop_from_top_level ();
6546 /* Generate code to handle the destruction of DECL, an object with
6547 static storage duration. */
6550 register_dtor_fn (tree decl)
6557 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6559 type = TREE_TYPE (decl);
6560 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6561 return void_zero_node;
6563 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6564 a class object, we can just pass the destructor to
6565 "__cxa_atexit"; we don't have to build a temporary function to do
6567 use_dtor = (flag_use_cxa_atexit
6568 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6569 && CLASS_TYPE_P (type));
6574 /* Find the destructor. */
6575 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6576 gcc_assert (idx >= 0);
6577 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6578 /* Make sure it is accessible. */
6579 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6583 /* Call build_cleanup before we enter the anonymous function so
6584 that any access checks will be done relative to the current
6585 scope, rather than the scope of the anonymous function. */
6586 build_cleanup (decl);
6588 /* Now start the function. */
6589 cleanup = start_cleanup_fn ();
6591 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6592 to the original function, rather than the anonymous one. That
6593 will make the back end think that nested functions are in use,
6594 which causes confusion. */
6595 push_deferring_access_checks (dk_no_check);
6596 fcall = build_cleanup (decl);
6597 pop_deferring_access_checks ();
6599 /* Create the body of the anonymous function. */
6600 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6601 finish_expr_stmt (fcall);
6602 finish_compound_stmt (compound_stmt);
6606 /* Call atexit with the cleanup function. */
6607 mark_used (cleanup);
6608 cleanup = build_address (cleanup);
6609 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6615 /* We must convert CLEANUP to the type that "__cxa_atexit"
6617 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6618 /* "__cxa_atexit" will pass the address of DECL to the
6619 cleanup function. */
6621 addr = build_address (decl);
6622 /* The declared type of the parameter to "__cxa_atexit" is
6623 "void *". For plain "T*", we could just let the
6624 machinery in cp_build_function_call convert it -- but if the
6625 type is "cv-qualified T *", then we need to convert it
6626 before passing it in, to avoid spurious errors. */
6627 addr = build_nop (ptr_type_node, addr);
6630 /* Since the cleanup functions we build ignore the address
6631 they're given, there's no reason to pass the actual address
6632 in, and, in general, it's cheaper to pass NULL than any
6634 addr = null_pointer_node;
6635 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6636 tf_warning_or_error);
6637 if (targetm.cxx.use_aeabi_atexit ())
6650 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6651 arg0, arg1, arg2, NULL_TREE);
6654 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6655 is its initializer. Generate code to handle the construction
6656 and destruction of DECL. */
6659 expand_static_init (tree decl, tree init)
6661 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6662 gcc_assert (TREE_STATIC (decl));
6664 /* Some variables require no dynamic initialization. */
6666 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6669 if (DECL_FUNCTION_SCOPE_P (decl))
6671 /* Emit code to perform this initialization but once. */
6672 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6673 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6674 tree guard, guard_addr;
6677 /* Emit code to perform this initialization but once. This code
6680 static <type> guard;
6681 if (!guard.first_byte) {
6682 if (__cxa_guard_acquire (&guard)) {
6685 // Do initialization.
6686 flag = true; __cxa_guard_release (&guard);
6687 // Register variable for destruction at end of program.
6689 if (!flag) __cxa_guard_abort (&guard);
6693 Note that the `flag' variable is only set to 1 *after* the
6694 initialization is complete. This ensures that an exception,
6695 thrown during the construction, will cause the variable to
6696 reinitialized when we pass through this code again, as per:
6700 If the initialization exits by throwing an exception, the
6701 initialization is not complete, so it will be tried again
6702 the next time control enters the declaration.
6704 This process should be thread-safe, too; multiple threads
6705 should not be able to initialize the variable more than
6708 /* Create the guard variable. */
6709 guard = get_guard (decl);
6711 /* This optimization isn't safe on targets with relaxed memory
6712 consistency. On such targets we force synchronization in
6713 __cxa_guard_acquire. */
6714 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6716 /* Begin the conditional initialization. */
6717 if_stmt = begin_if_stmt ();
6718 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6719 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6722 if (flag_threadsafe_statics)
6724 tree vfntype = NULL_TREE;
6725 tree acquire_name, release_name, abort_name;
6726 tree acquire_fn, release_fn, abort_fn;
6727 guard_addr = build_address (guard);
6729 acquire_name = get_identifier ("__cxa_guard_acquire");
6730 release_name = get_identifier ("__cxa_guard_release");
6731 abort_name = get_identifier ("__cxa_guard_abort");
6732 acquire_fn = identifier_global_value (acquire_name);
6733 release_fn = identifier_global_value (release_name);
6734 abort_fn = identifier_global_value (abort_name);
6736 acquire_fn = push_library_fn
6737 (acquire_name, build_function_type_list (integer_type_node,
6738 TREE_TYPE (guard_addr),
6741 if (!release_fn || !abort_fn)
6742 vfntype = build_function_type_list (void_type_node,
6743 TREE_TYPE (guard_addr),
6746 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6748 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6750 inner_if_stmt = begin_if_stmt ();
6751 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6754 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6755 begin = get_target_expr (boolean_false_node);
6756 flag = TARGET_EXPR_SLOT (begin);
6758 TARGET_EXPR_CLEANUP (begin)
6759 = build3 (COND_EXPR, void_type_node, flag,
6761 build_call_n (abort_fn, 1, guard_addr));
6762 CLEANUP_EH_ONLY (begin) = 1;
6764 /* Do the initialization itself. */
6765 init = add_stmt_to_compound (begin, init);
6766 init = add_stmt_to_compound
6767 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6768 init = add_stmt_to_compound
6769 (init, build_call_n (release_fn, 1, guard_addr));
6772 init = add_stmt_to_compound (init, set_guard (guard));
6774 /* Use atexit to register a function for destroying this static
6776 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6778 finish_expr_stmt (init);
6780 if (flag_threadsafe_statics)
6782 finish_compound_stmt (inner_then_clause);
6783 finish_then_clause (inner_if_stmt);
6784 finish_if_stmt (inner_if_stmt);
6787 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6789 finish_compound_stmt (then_clause);
6790 finish_then_clause (if_stmt);
6791 finish_if_stmt (if_stmt);
6795 static_aggregates = tree_cons (init, decl, static_aggregates);
6799 /* Make TYPE a complete type based on INITIAL_VALUE.
6800 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6801 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6802 3 if the initializer list is empty (in pedantic mode). */
6805 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6808 tree type, elt_type;
6812 unsigned HOST_WIDE_INT i;
6815 /* An array of character type can be initialized from a
6816 brace-enclosed string constant.
6818 FIXME: this code is duplicated from reshape_init. Probably
6819 we should just call reshape_init here? */
6820 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6821 && TREE_CODE (initial_value) == CONSTRUCTOR
6822 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6824 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6825 tree value = VEC_index (constructor_elt, v, 0)->value;
6827 if (TREE_CODE (value) == STRING_CST
6828 && VEC_length (constructor_elt, v) == 1)
6829 initial_value = value;
6832 /* If any of the elements are parameter packs, we can't actually
6833 complete this type now because the array size is dependent. */
6834 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6836 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6839 if (PACK_EXPANSION_P (value))
6845 failure = complete_array_type (ptype, initial_value, do_default);
6847 /* We can create the array before the element type is complete, which
6848 means that we didn't have these two bits set in the original type
6849 either. In completing the type, we are expected to propagate these
6850 bits. See also complete_type which does the same thing for arrays
6853 if (TYPE_DOMAIN (type))
6855 elt_type = TREE_TYPE (type);
6856 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6857 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6858 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6864 /* As above, but either give an error or reject zero-size arrays, depending
6868 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6869 bool do_default, tsubst_flags_t complain)
6872 bool sfinae = !(complain & tf_error);
6873 /* In SFINAE context we can't be lenient about zero-size arrays. */
6876 failure = cp_complete_array_type (ptype, initial_value, do_default);
6882 /* Not an error. */;
6883 else if (failure == 1)
6884 error ("initializer fails to determine size of %qT", *ptype);
6885 else if (failure == 2)
6888 error ("array size missing in %qT", *ptype);
6890 else if (failure == 3)
6891 error ("zero-size array %qT", *ptype);
6892 *ptype = error_mark_node;
6897 /* Return zero if something is declared to be a member of type
6898 CTYPE when in the context of CUR_TYPE. STRING is the error
6899 message to print in that case. Otherwise, quietly return 1. */
6902 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6904 if (ctype && ctype != cur_type)
6906 if (flags == DTOR_FLAG)
6907 error ("destructor for alien class %qT cannot be a member", ctype);
6909 error ("constructor for alien class %qT cannot be a member", ctype);
6915 /* Subroutine of `grokdeclarator'. */
6917 /* Generate errors possibly applicable for a given set of specifiers.
6918 This is for ARM $7.1.2. */
6921 bad_specifiers (tree object,
6922 enum bad_spec_place type,
6933 error ("%qD declared as a %<virtual%> variable", object);
6935 error ("%qD declared as an %<inline%> variable", object);
6937 error ("%<const%> and %<volatile%> function specifiers on "
6938 "%qD invalid in variable declaration", object);
6942 error ("%qD declared as a %<virtual%> parameter", object);
6944 error ("%qD declared as an %<inline%> parameter", object);
6946 error ("%<const%> and %<volatile%> function specifiers on "
6947 "%qD invalid in parameter declaration", object);
6951 error ("%qD declared as a %<virtual%> type", object);
6953 error ("%qD declared as an %<inline%> type", object);
6955 error ("%<const%> and %<volatile%> function specifiers on "
6956 "%qD invalid in type declaration", object);
6960 error ("%qD declared as a %<virtual%> field", object);
6962 error ("%qD declared as an %<inline%> field", object);
6964 error ("%<const%> and %<volatile%> function specifiers on "
6965 "%qD invalid in field declaration", object);
6971 error ("%q+D declared as a friend", object);
6973 && (TREE_CODE (object) == TYPE_DECL
6974 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6975 && !TYPE_REFFN_P (TREE_TYPE (object))
6976 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6977 error ("%q+D declared with an exception specification", object);
6980 /* DECL is a member function or static data member and is presently
6981 being defined. Check that the definition is taking place in a
6985 check_class_member_definition_namespace (tree decl)
6987 /* These checks only apply to member functions and static data
6989 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6990 || TREE_CODE (decl) == VAR_DECL);
6991 /* We check for problems with specializations in pt.c in
6992 check_specialization_namespace, where we can issue better
6994 if (processing_specialization)
6996 /* There are no restrictions on the placement of
6997 explicit instantiations. */
6998 if (processing_explicit_instantiation)
7002 A member function definition that appears outside of the
7003 class definition shall appear in a namespace scope enclosing
7004 the class definition.
7008 The definition for a static data member shall appear in a
7009 namespace scope enclosing the member's class definition. */
7010 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7011 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7012 decl, DECL_CONTEXT (decl));
7015 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7016 METHOD_TYPE for a non-static member function; QUALS are the
7017 cv-qualifiers that apply to the function. */
7020 build_this_parm (tree type, cp_cv_quals quals)
7025 cp_cv_quals this_quals;
7027 if (CLASS_TYPE_P (type))
7030 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7031 this_type = build_pointer_type (this_type);
7034 this_type = type_of_this_parm (type);
7035 /* The `this' parameter is implicitly `const'; it cannot be
7037 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7038 qual_type = cp_build_qualified_type (this_type, this_quals);
7039 parm = build_artificial_parm (this_identifier, qual_type);
7040 cp_apply_type_quals_to_decl (this_quals, parm);
7044 /* DECL is a static member function. Complain if it was declared
7045 with function-cv-quals. */
7048 check_static_quals (tree decl, cp_cv_quals quals)
7050 if (quals != TYPE_UNQUALIFIED)
7051 error ("static member function %q#D declared with type qualifiers",
7055 /* CTYPE is class type, or null if non-class.
7056 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7058 DECLARATOR is the function's name.
7059 PARMS is a chain of PARM_DECLs for the function.
7060 VIRTUALP is truthvalue of whether the function is virtual or not.
7061 FLAGS are to be passed through to `grokclassfn'.
7062 QUALS are qualifiers indicating whether the function is `const'
7064 RAISES is a list of exceptions that this function can raise.
7065 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7066 not look, and -1 if we should not call `grokclassfn' at all.
7068 SFK is the kind of special function (if any) for the new function.
7070 Returns `NULL_TREE' if something goes wrong, after issuing
7071 applicable error messages. */
7074 grokfndecl (tree ctype,
7078 tree orig_declarator,
7080 enum overload_flags flags,
7087 special_function_kind sfk,
7092 location_t location)
7095 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7099 type = build_exception_variant (type, raises);
7101 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7103 /* If we have an explicit location, use it, otherwise use whatever
7104 build_lang_decl used (probably input_location). */
7105 if (location != UNKNOWN_LOCATION)
7106 DECL_SOURCE_LOCATION (decl) = location;
7108 if (TREE_CODE (type) == METHOD_TYPE)
7111 parm = build_this_parm (type, quals);
7112 DECL_CHAIN (parm) = parms;
7115 DECL_ARGUMENTS (decl) = parms;
7116 for (t = parms; t; t = DECL_CHAIN (t))
7117 DECL_CONTEXT (t) = decl;
7118 /* Propagate volatile out from type to decl. */
7119 if (TYPE_VOLATILE (type))
7120 TREE_THIS_VOLATILE (decl) = 1;
7122 /* Setup decl according to sfk. */
7125 case sfk_constructor:
7126 case sfk_copy_constructor:
7127 case sfk_move_constructor:
7128 DECL_CONSTRUCTOR_P (decl) = 1;
7130 case sfk_destructor:
7131 DECL_DESTRUCTOR_P (decl) = 1;
7137 /* If pointers to member functions use the least significant bit to
7138 indicate whether a function is virtual, ensure a pointer
7139 to this function will have that bit clear. */
7140 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7141 && TREE_CODE (type) == METHOD_TYPE
7142 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7143 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7146 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7150 ("defining explicit specialization %qD in friend declaration",
7154 tree fns = TREE_OPERAND (orig_declarator, 0);
7155 tree args = TREE_OPERAND (orig_declarator, 1);
7157 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7159 /* Something like `template <class T> friend void f<T>()'. */
7160 error ("invalid use of template-id %qD in declaration "
7161 "of primary template",
7167 /* A friend declaration of the form friend void f<>(). Record
7168 the information in the TEMPLATE_ID_EXPR. */
7169 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7171 if (TREE_CODE (fns) == COMPONENT_REF)
7173 /* Due to bison parser ickiness, we will have already looked
7174 up an operator_name or PFUNCNAME within the current class
7175 (see template_id in parse.y). If the current class contains
7176 such a name, we'll get a COMPONENT_REF here. Undo that. */
7178 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7179 == current_class_type);
7180 fns = TREE_OPERAND (fns, 1);
7182 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7183 || TREE_CODE (fns) == OVERLOAD);
7184 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7186 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7187 if (TREE_PURPOSE (t)
7188 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7190 error ("default arguments are not allowed in declaration "
7191 "of friend template specialization %qD",
7198 error ("%<inline%> is not allowed in declaration of friend "
7199 "template specialization %qD",
7206 /* If this decl has namespace scope, set that up. */
7208 set_decl_namespace (decl, in_namespace, friendp);
7210 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7212 /* `main' and builtins have implicit 'C' linkage. */
7213 if ((MAIN_NAME_P (declarator)
7214 || (IDENTIFIER_LENGTH (declarator) > 10
7215 && IDENTIFIER_POINTER (declarator)[0] == '_'
7216 && IDENTIFIER_POINTER (declarator)[1] == '_'
7217 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7218 && current_lang_name == lang_name_cplusplus
7219 && ctype == NULL_TREE
7220 && DECL_FILE_SCOPE_P (decl))
7221 SET_DECL_LANGUAGE (decl, lang_c);
7223 /* Should probably propagate const out from type to decl I bet (mrs). */
7226 DECL_STATIC_FUNCTION_P (decl) = 1;
7227 DECL_CONTEXT (decl) = ctype;
7232 DECL_CONTEXT (decl) = ctype;
7234 check_class_member_definition_namespace (decl);
7237 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7239 if (processing_template_decl)
7240 error ("cannot declare %<::main%> to be a template");
7242 error ("cannot declare %<::main%> to be inline");
7244 error ("cannot declare %<::main%> to be static");
7249 /* Members of anonymous types and local classes have no linkage; make
7250 them internal. If a typedef is made later, this will be changed. */
7251 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7252 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7255 if (publicp && cxx_dialect == cxx98)
7257 /* [basic.link]: A name with no linkage (notably, the name of a class
7258 or enumeration declared in a local scope) shall not be used to
7259 declare an entity with linkage.
7261 DR 757 relaxes this restriction for C++0x. */
7262 t = no_linkage_check (TREE_TYPE (decl),
7263 /*relaxed_p=*/false);
7266 if (TYPE_ANONYMOUS_P (t))
7268 if (DECL_EXTERN_C_P (decl))
7269 /* Allow this; it's pretty common in C. */;
7272 permerror (input_location, "anonymous type with no linkage "
7273 "used to declare function %q#D with linkage",
7275 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7276 permerror (input_location, "%q+#D does not refer to the unqualified "
7277 "type, so it is not used for linkage",
7282 permerror (input_location, "type %qT with no linkage used to "
7283 "declare function %q#D with linkage", t, decl);
7287 TREE_PUBLIC (decl) = publicp;
7290 DECL_INTERFACE_KNOWN (decl) = 1;
7291 DECL_NOT_REALLY_EXTERN (decl) = 1;
7294 /* If the declaration was declared inline, mark it as such. */
7296 DECL_DECLARED_INLINE_P (decl) = 1;
7298 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7300 DECL_EXTERNAL (decl) = 1;
7301 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7304 ? G_("static member function %qD cannot have cv-qualifier")
7305 : G_("non-member function %qD cannot have cv-qualifier"),
7307 quals = TYPE_UNQUALIFIED;
7310 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7311 && !grok_op_properties (decl, /*complain=*/true))
7313 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7315 bool long_long_unsigned_p;
7317 const char *suffix = NULL;
7318 /* [over.literal]/6: Literal operators shall not have C linkage. */
7319 if (DECL_LANGUAGE (decl) == lang_c)
7321 error ("literal operator with C linkage");
7325 if (DECL_NAMESPACE_SCOPE_P (decl))
7327 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7330 error ("%qD has invalid argument list", decl);
7334 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7335 if (long_long_unsigned_p)
7337 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7338 warning (0, "integer suffix %<%s%>"
7339 " shadowed by implementation", suffix);
7341 else if (long_double_p)
7343 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7344 warning (0, "floating point suffix %<%s%>"
7345 " shadowed by implementation", suffix);
7350 error ("%qD must be a non-member function", decl);
7356 /* Make the init_value nonzero so pushdecl knows this is not
7357 tentative. error_mark_node is replaced later with the BLOCK. */
7358 DECL_INITIAL (decl) = error_mark_node;
7360 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7361 TREE_NOTHROW (decl) = 1;
7363 /* Caller will do the rest of this. */
7367 if (ctype != NULL_TREE)
7368 grokclassfn (ctype, decl, flags);
7370 decl = check_explicit_specialization (orig_declarator, decl,
7373 4 * (friendp != 0));
7374 if (decl == error_mark_node)
7377 if (DECL_STATIC_FUNCTION_P (decl))
7378 check_static_quals (decl, quals);
7382 cplus_decl_attributes (&decl, *attrlist, 0);
7383 *attrlist = NULL_TREE;
7386 /* Check main's type after attributes have been applied. */
7387 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7389 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7392 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7394 error ("%<::main%> must return %<int%>");
7395 newtype = build_function_type (integer_type_node, oldtypeargs);
7396 TREE_TYPE (decl) = newtype;
7399 check_main_parameter_types (decl);
7402 if (ctype != NULL_TREE
7403 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7406 tree old_decl = check_classfn (ctype, decl,
7407 (processing_template_decl
7408 > template_class_depth (ctype))
7409 ? current_template_parms
7412 if (old_decl == error_mark_node)
7420 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7421 /* Because grokfndecl is always supposed to return a
7422 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7423 here. We depend on our callers to figure out that its
7424 really a template that's being returned. */
7425 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7427 if (DECL_STATIC_FUNCTION_P (old_decl)
7428 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7430 /* Remove the `this' parm added by grokclassfn. */
7431 revert_static_member_fn (decl);
7432 check_static_quals (decl, quals);
7434 if (DECL_ARTIFICIAL (old_decl))
7436 error ("definition of implicitly-declared %qD", old_decl);
7439 else if (DECL_DEFAULTED_FN (old_decl))
7441 error ("definition of explicitly-defaulted %q+D", decl);
7442 error ("%q+#D explicitly defaulted here", old_decl);
7446 /* Since we've smashed OLD_DECL to its
7447 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7448 if (TREE_CODE (decl) == TEMPLATE_DECL)
7449 decl = DECL_TEMPLATE_RESULT (decl);
7451 /* Attempt to merge the declarations. This can fail, in
7452 the case of some invalid specialization declarations. */
7453 pushed_scope = push_scope (ctype);
7454 ok = duplicate_decls (decl, old_decl, friendp);
7456 pop_scope (pushed_scope);
7459 error ("no %q#D member function declared in class %qT",
7467 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7470 if (ctype == NULL_TREE || check)
7474 DECL_VIRTUAL_P (decl) = 1;
7479 /* decl is a FUNCTION_DECL.
7480 specifiers are the parsed virt-specifiers.
7482 Set flags to reflect the virt-specifiers.
7487 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7489 if (decl == NULL_TREE)
7491 if (specifiers & VIRT_SPEC_OVERRIDE)
7492 DECL_OVERRIDE_P (decl) = 1;
7493 if (specifiers & VIRT_SPEC_FINAL)
7494 DECL_FINAL_P (decl) = 1;
7498 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7499 the linkage that DECL will receive in the object file. */
7502 set_linkage_for_static_data_member (tree decl)
7504 /* A static data member always has static storage duration and
7505 external linkage. Note that static data members are forbidden in
7506 local classes -- the only situation in which a class has
7507 non-external linkage. */
7508 TREE_PUBLIC (decl) = 1;
7509 TREE_STATIC (decl) = 1;
7510 /* For non-template classes, static data members are always put
7511 out in exactly those files where they are defined, just as
7512 with ordinary namespace-scope variables. */
7513 if (!processing_template_decl)
7514 DECL_INTERFACE_KNOWN (decl) = 1;
7517 /* Create a VAR_DECL named NAME with the indicated TYPE.
7519 If SCOPE is non-NULL, it is the class type or namespace containing
7520 the variable. If SCOPE is NULL, the variable should is created in
7521 the innermost enclosings scope. */
7524 grokvardecl (tree type,
7526 const cp_decl_specifier_seq *declspecs,
7532 tree explicit_scope;
7534 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7536 /* Compute the scope in which to place the variable, but remember
7537 whether or not that scope was explicitly specified by the user. */
7538 explicit_scope = scope;
7541 /* An explicit "extern" specifier indicates a namespace-scope
7543 if (declspecs->storage_class == sc_extern)
7544 scope = current_decl_namespace ();
7545 else if (!at_function_scope_p ())
7546 scope = current_scope ();
7550 && (/* If the variable is a namespace-scope variable declared in a
7551 template, we need DECL_LANG_SPECIFIC. */
7552 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7553 /* Similarly for namespace-scope variables with language linkage
7555 || (TREE_CODE (scope) == NAMESPACE_DECL
7556 && current_lang_name != lang_name_cplusplus)
7557 /* Similarly for static data members. */
7559 decl = build_lang_decl (VAR_DECL, name, type);
7561 decl = build_decl (input_location, VAR_DECL, name, type);
7563 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7564 set_decl_namespace (decl, explicit_scope, 0);
7566 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7568 if (declspecs->storage_class == sc_extern)
7570 DECL_THIS_EXTERN (decl) = 1;
7571 DECL_EXTERNAL (decl) = !initialized;
7574 if (DECL_CLASS_SCOPE_P (decl))
7576 set_linkage_for_static_data_member (decl);
7577 /* This function is only called with out-of-class definitions. */
7578 DECL_EXTERNAL (decl) = 0;
7579 check_class_member_definition_namespace (decl);
7581 /* At top level, either `static' or no s.c. makes a definition
7582 (perhaps tentative), and absence of `static' makes it public. */
7583 else if (toplevel_bindings_p ())
7585 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7586 && (DECL_THIS_EXTERN (decl) || ! constp));
7587 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7589 /* Not at top level, only `static' makes a static definition. */
7592 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7593 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7596 if (declspecs->specs[(int)ds_thread])
7597 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7599 /* If the type of the decl has no linkage, make sure that we'll
7600 notice that in mark_used. */
7601 if (cxx_dialect > cxx98
7602 && decl_linkage (decl) != lk_none
7603 && DECL_LANG_SPECIFIC (decl) == NULL
7604 && !DECL_EXTERN_C_P (decl)
7605 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7606 retrofit_lang_decl (decl);
7608 if (TREE_PUBLIC (decl))
7610 /* [basic.link]: A name with no linkage (notably, the name of a class
7611 or enumeration declared in a local scope) shall not be used to
7612 declare an entity with linkage.
7614 DR 757 relaxes this restriction for C++0x. */
7615 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7616 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7619 if (TYPE_ANONYMOUS_P (t))
7621 if (DECL_EXTERN_C_P (decl))
7622 /* Allow this; it's pretty common in C. */
7626 /* DRs 132, 319 and 389 seem to indicate types with
7627 no linkage can only be used to declare extern "C"
7628 entities. Since it's not always an error in the
7629 ISO C++ 90 Standard, we only issue a warning. */
7630 warning (0, "anonymous type with no linkage used to declare "
7631 "variable %q#D with linkage", decl);
7632 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7633 warning (0, "%q+#D does not refer to the unqualified "
7634 "type, so it is not used for linkage",
7639 warning (0, "type %qT with no linkage used to declare variable "
7640 "%q#D with linkage", t, decl);
7644 DECL_INTERFACE_KNOWN (decl) = 1;
7649 /* Create and return a canonical pointer to member function type, for
7650 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7653 build_ptrmemfunc_type (tree type)
7657 tree unqualified_variant = NULL_TREE;
7659 if (type == error_mark_node)
7662 /* If a canonical type already exists for this type, use it. We use
7663 this method instead of type_hash_canon, because it only does a
7664 simple equality check on the list of field members. */
7666 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7669 /* Make sure that we always have the unqualified pointer-to-member
7671 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7673 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7675 t = make_class_type (RECORD_TYPE);
7676 xref_basetypes (t, NULL_TREE);
7678 /* Let the front end know this is a pointer to member function... */
7679 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7680 /* ... and not really a class type. */
7681 SET_CLASS_TYPE_P (t, 0);
7683 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7686 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7688 DECL_CHAIN (field) = fields;
7691 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7693 /* Zap out the name so that the back end will give us the debugging
7694 information for this anonymous RECORD_TYPE. */
7695 TYPE_NAME (t) = NULL_TREE;
7697 /* If this is not the unqualified form of this pointer-to-member
7698 type, set the TYPE_MAIN_VARIANT for this type to be the
7699 unqualified type. Since they are actually RECORD_TYPEs that are
7700 not variants of each other, we must do this manually.
7701 As we just built a new type there is no need to do yet another copy. */
7702 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7704 int type_quals = cp_type_quals (type);
7705 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7706 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7707 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7708 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7709 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7710 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7711 TREE_TYPE (TYPE_BINFO (t)) = t;
7714 /* Cache this pointer-to-member type so that we can find it again
7716 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7718 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7719 SET_TYPE_STRUCTURAL_EQUALITY (t);
7720 else if (TYPE_CANONICAL (type) != type)
7721 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7726 /* Create and return a pointer to data member type. */
7729 build_ptrmem_type (tree class_type, tree member_type)
7731 if (TREE_CODE (member_type) == METHOD_TYPE)
7733 cp_cv_quals quals = type_memfn_quals (member_type);
7734 member_type = build_memfn_type (member_type, class_type, quals);
7735 return build_ptrmemfunc_type (build_pointer_type (member_type));
7739 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7740 return build_offset_type (class_type, member_type);
7744 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7745 Check to see that the definition is valid. Issue appropriate error
7746 messages. Return 1 if the definition is particularly bad, or 0
7750 check_static_variable_definition (tree decl, tree type)
7752 /* Can't check yet if we don't know the type. */
7753 if (dependent_type_p (type))
7755 /* If DECL is declared constexpr, we'll do the appropriate checks
7756 in check_initializer. */
7757 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7759 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7761 if (literal_type_p (type))
7762 permerror (input_location,
7763 "%<constexpr%> needed for in-class initialization of "
7764 "static data member %q#D of non-integral type", decl);
7766 error ("in-class initialization of static data member %q#D of "
7767 "non-literal type", decl);
7771 /* Motion 10 at San Diego: If a static const integral data member is
7772 initialized with an integral constant expression, the initializer
7773 may appear either in the declaration (within the class), or in
7774 the definition, but not both. If it appears in the class, the
7775 member is a member constant. The file-scope definition is always
7777 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7779 error ("invalid in-class initialization of static data member "
7780 "of non-integral type %qT",
7784 else if (!CP_TYPE_CONST_P (type))
7785 error ("ISO C++ forbids in-class initialization of non-const "
7786 "static member %qD",
7788 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7789 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7790 "%qD of non-integral type %qT", decl, type);
7795 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7796 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7797 expressions out into temporary variables so that walk_tree doesn't
7798 step into them (c++/15764). */
7801 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7803 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7804 tree expr = *expr_p;
7805 if (TREE_CODE (expr) == SAVE_EXPR)
7807 tree op = TREE_OPERAND (expr, 0);
7808 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7809 if (TREE_SIDE_EFFECTS (op))
7810 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7813 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7818 /* Entry point for the above. */
7821 stabilize_vla_size (tree size)
7823 struct pointer_set_t *pset = pointer_set_create ();
7824 /* Break out any function calls into temporary variables. */
7825 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7828 /* Given the SIZE (i.e., number of elements) in an array, compute an
7829 appropriate index type for the array. If non-NULL, NAME is the
7830 name of the thing being declared. */
7833 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7838 tree abi_1_itype = NULL_TREE;
7840 if (error_operand_p (size))
7841 return error_mark_node;
7843 type = TREE_TYPE (size);
7844 /* type_dependent_expression_p? */
7845 if (!dependent_type_p (type))
7847 mark_rvalue_use (size);
7849 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7850 && TREE_SIDE_EFFECTS (size))
7851 /* In C++98, we mark a non-constant array bound with a magic
7852 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7855 size = fold_non_dependent_expr (size);
7857 if (CLASS_TYPE_P (type)
7858 && CLASSTYPE_LITERAL_P (type))
7860 size = build_expr_type_conversion (WANT_INT, size, true);
7863 if (!(complain & tf_error))
7864 return error_mark_node;
7866 error ("size of array %qD has non-integral type %qT",
7869 error ("size of array has non-integral type %qT", type);
7870 size = integer_one_node;
7872 if (size == error_mark_node)
7873 return error_mark_node;
7874 type = TREE_TYPE (size);
7875 /* We didn't support this case in GCC 3.2, so don't bother
7876 trying to model it now in ABI v1. */
7877 abi_1_itype = error_mark_node;
7880 size = maybe_constant_value (size);
7881 if (!TREE_CONSTANT (size))
7885 if (error_operand_p (size))
7886 return error_mark_node;
7888 /* The array bound must be an integer type. */
7889 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7891 if (!(complain & tf_error))
7892 return error_mark_node;
7894 error ("size of array %qD has non-integral type %qT", name, type);
7896 error ("size of array has non-integral type %qT", type);
7897 size = integer_one_node;
7898 type = TREE_TYPE (size);
7902 /* A type is dependent if it is...an array type constructed from any
7903 dependent type or whose size is specified by a constant expression
7904 that is value-dependent. */
7905 /* We can only call value_dependent_expression_p on integral constant
7906 expressions; treat non-constant expressions as dependent, too. */
7907 if (processing_template_decl
7908 && (dependent_type_p (type)
7909 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7911 /* We cannot do any checking for a SIZE that isn't known to be
7912 constant. Just build the index type and mark that it requires
7913 structural equality checks. */
7914 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7915 size, integer_one_node));
7916 TYPE_DEPENDENT_P (itype) = 1;
7917 TYPE_DEPENDENT_P_VALID (itype) = 1;
7918 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7922 if (!abi_version_at_least (2) && processing_template_decl
7923 && abi_1_itype == NULL_TREE)
7924 /* For abi-1, we handled all instances in templates the same way,
7925 even when they were non-dependent. This affects the manglings
7926 produced. So, we do the normal checking for non-dependent
7927 sizes, but at the end we'll return the same type that abi-1
7928 would have, but with TYPE_CANONICAL set to the "right"
7929 value that the current ABI would provide. */
7930 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7931 osize, integer_one_node));
7933 /* Normally, the array-bound will be a constant. */
7934 if (TREE_CODE (size) == INTEGER_CST)
7936 /* Check to see if the array bound overflowed. Make that an
7937 error, no matter how generous we're being. */
7938 constant_expression_error (size);
7940 /* An array must have a positive number of elements. */
7941 if (INT_CST_LT (size, integer_zero_node))
7943 if (!(complain & tf_error))
7944 return error_mark_node;
7946 error ("size of array %qD is negative", name);
7948 error ("size of array is negative");
7949 size = integer_one_node;
7951 /* As an extension we allow zero-sized arrays. */
7952 else if (integer_zerop (size))
7954 if (!(complain & tf_error))
7955 /* We must fail if performing argument deduction (as
7956 indicated by the state of complain), so that
7957 another substitution can be found. */
7958 return error_mark_node;
7959 else if (in_system_header)
7960 /* Allow them in system headers because glibc uses them. */;
7962 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7964 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7967 else if (TREE_CONSTANT (size)
7968 /* We don't allow VLAs at non-function scopes, or during
7969 tentative template substitution. */
7970 || !at_function_scope_p () || !(complain & tf_error))
7972 if (!(complain & tf_error))
7973 return error_mark_node;
7974 /* `(int) &fn' is not a valid array bound. */
7976 error ("size of array %qD is not an integral constant-expression",
7979 error ("size of array is not an integral constant-expression");
7980 size = integer_one_node;
7982 else if (pedantic && warn_vla != 0)
7985 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7987 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7989 else if (warn_vla > 0)
7993 "variable length array %qD is used", name);
7996 "variable length array is used");
7999 if (processing_template_decl && !TREE_CONSTANT (size))
8000 /* A variable sized array. */
8001 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8004 HOST_WIDE_INT saved_processing_template_decl;
8006 /* Compute the index of the largest element in the array. It is
8007 one less than the number of elements in the array. We save
8008 and restore PROCESSING_TEMPLATE_DECL so that computations in
8009 cp_build_binary_op will be appropriately folded. */
8010 saved_processing_template_decl = processing_template_decl;
8011 processing_template_decl = 0;
8012 itype = cp_build_binary_op (input_location,
8014 cp_convert (ssizetype, size),
8015 cp_convert (ssizetype, integer_one_node),
8016 tf_warning_or_error);
8017 itype = fold (itype);
8018 processing_template_decl = saved_processing_template_decl;
8020 if (!TREE_CONSTANT (itype))
8021 /* A variable sized array. */
8022 itype = variable_size (itype);
8023 /* Make sure that there was no overflow when creating to a signed
8024 index type. (For example, on a 32-bit machine, an array with
8025 size 2^32 - 1 is too big.) */
8026 else if (TREE_CODE (itype) == INTEGER_CST
8027 && TREE_OVERFLOW (itype))
8029 if (!(complain & tf_error))
8030 return error_mark_node;
8031 error ("overflow in array dimension");
8032 TREE_OVERFLOW (itype) = 0;
8036 /* Create and return the appropriate index type. */
8037 if (abi_1_itype && abi_1_itype != error_mark_node)
8039 tree t = build_index_type (itype);
8040 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8041 itype = abi_1_itype;
8044 itype = build_index_type (itype);
8046 /* If the index type were dependent, we would have returned early, so
8047 remember that it isn't. */
8048 TYPE_DEPENDENT_P (itype) = 0;
8049 TYPE_DEPENDENT_P_VALID (itype) = 1;
8053 /* Returns the scope (if any) in which the entity declared by
8054 DECLARATOR will be located. If the entity was declared with an
8055 unqualified name, NULL_TREE is returned. */
8058 get_scope_of_declarator (const cp_declarator *declarator)
8060 while (declarator && declarator->kind != cdk_id)
8061 declarator = declarator->declarator;
8063 /* If the declarator-id is a SCOPE_REF, the scope in which the
8064 declaration occurs is the first operand. */
8066 && declarator->u.id.qualifying_scope)
8067 return declarator->u.id.qualifying_scope;
8069 /* Otherwise, the declarator is not a qualified name; the entity will
8070 be declared in the current scope. */
8074 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8075 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8079 create_array_type_for_decl (tree name, tree type, tree size)
8081 tree itype = NULL_TREE;
8083 /* If things have already gone awry, bail now. */
8084 if (type == error_mark_node || size == error_mark_node)
8085 return error_mark_node;
8087 /* 8.3.4/1: If the type of the identifier of D contains the auto
8088 type-specifier, the program is ill-formed. */
8089 if (pedantic && type_uses_auto (type))
8090 pedwarn (input_location, OPT_pedantic,
8091 "declaration of %qD as array of %<auto%>", name);
8093 /* If there are some types which cannot be array elements,
8094 issue an error-message and return. */
8095 switch (TREE_CODE (type))
8099 error ("declaration of %qD as array of void", name);
8101 error ("creating array of void");
8102 return error_mark_node;
8106 error ("declaration of %qD as array of functions", name);
8108 error ("creating array of functions");
8109 return error_mark_node;
8111 case REFERENCE_TYPE:
8113 error ("declaration of %qD as array of references", name);
8115 error ("creating array of references");
8116 return error_mark_node;
8120 error ("declaration of %qD as array of function members", name);
8122 error ("creating array of function members");
8123 return error_mark_node;
8131 The constant expressions that specify the bounds of the arrays
8132 can be omitted only for the first member of the sequence. */
8133 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8136 error ("declaration of %qD as multidimensional array must "
8137 "have bounds for all dimensions except the first",
8140 error ("multidimensional array must have bounds for all "
8141 "dimensions except the first");
8143 return error_mark_node;
8146 /* Figure out the index type for the array. */
8148 itype = compute_array_index_type (name, size, tf_warning_or_error);
8151 T is called the array element type; this type shall not be [...] an
8152 abstract class type. */
8153 abstract_virtuals_error (name, type);
8155 return build_cplus_array_type (type, itype);
8158 /* Check that it's OK to declare a function with the indicated TYPE.
8159 SFK indicates the kind of special function (if any) that this
8160 function is. OPTYPE is the type given in a conversion operator
8161 declaration, or the class type for a constructor/destructor.
8162 Returns the actual return type of the function; that
8163 may be different than TYPE if an error occurs, or for certain
8164 special functions. */
8167 check_special_function_return_type (special_function_kind sfk,
8173 case sfk_constructor:
8175 error ("return type specification for constructor invalid");
8177 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8178 type = build_pointer_type (optype);
8180 type = void_type_node;
8183 case sfk_destructor:
8185 error ("return type specification for destructor invalid");
8186 /* We can't use the proper return type here because we run into
8187 problems with ambiguous bases and covariant returns.
8188 Java classes are left unchanged because (void *) isn't a valid
8189 Java type, and we don't want to change the Java ABI. */
8190 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8191 type = build_pointer_type (void_type_node);
8193 type = void_type_node;
8196 case sfk_conversion:
8198 error ("return type specified for %<operator %T%>", optype);
8209 /* A variable or data member (whose unqualified name is IDENTIFIER)
8210 has been declared with the indicated TYPE. If the TYPE is not
8211 acceptable, issue an error message and return a type to use for
8212 error-recovery purposes. */
8215 check_var_type (tree identifier, tree type)
8217 if (VOID_TYPE_P (type))
8220 error ("unnamed variable or field declared void");
8221 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8223 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8224 error ("variable or field %qE declared void", identifier);
8227 error ("variable or field declared void");
8228 type = error_mark_node;
8234 /* Given declspecs and a declarator (abstract or otherwise), determine
8235 the name and type of the object declared and construct a DECL node
8238 DECLSPECS points to the representation of declaration-specifier
8239 sequence that precedes declarator.
8241 DECL_CONTEXT says which syntactic context this declaration is in:
8242 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8243 FUNCDEF for a function definition. Like NORMAL but a few different
8244 error messages in each case. Return value may be zero meaning
8245 this definition is too screwy to try to parse.
8246 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8247 handle member functions (which have FIELD context).
8248 Return value may be zero meaning this definition is too screwy to
8250 PARM for a parameter declaration (either within a function prototype
8251 or before a function body). Make a PARM_DECL, or return void_type_node.
8252 TPARM for a template parameter declaration.
8253 CATCHPARM for a parameter declaration before a catch clause.
8254 TYPENAME if for a typename (in a cast or sizeof).
8255 Don't make a DECL node; just return the ..._TYPE node.
8256 FIELD for a struct or union field; make a FIELD_DECL.
8257 BITFIELD for a field with specified width.
8259 INITIALIZED is as for start_decl.
8261 ATTRLIST is a pointer to the list of attributes, which may be NULL
8262 if there are none; *ATTRLIST may be modified if attributes from inside
8263 the declarator should be applied to the declaration.
8265 When this function is called, scoping variables (such as
8266 CURRENT_CLASS_TYPE) should reflect the scope in which the
8267 declaration occurs, not the scope in which the new declaration will
8268 be placed. For example, on:
8272 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8275 Returns a DECL (if a declarator is present), a TYPE (if there is no
8276 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8280 grokdeclarator (const cp_declarator *declarator,
8281 const cp_decl_specifier_seq *declspecs,
8282 enum decl_context decl_context,
8286 tree type = NULL_TREE;
8288 int explicit_int128 = 0;
8289 int virtualp, explicitp, friendp, inlinep, staticp;
8290 int explicit_int = 0;
8291 int explicit_char = 0;
8292 int defaulted_int = 0;
8293 tree dependent_name = NULL_TREE;
8295 tree typedef_decl = NULL_TREE;
8296 const char *name = NULL;
8297 tree typedef_type = NULL_TREE;
8298 /* True if this declarator is a function definition. */
8299 bool funcdef_flag = false;
8300 cp_declarator_kind innermost_code = cdk_error;
8303 /* See the code below that used this. */
8304 tree decl_attr = NULL_TREE;
8307 /* Keep track of what sort of function is being processed
8308 so that we can warn about default return values, or explicit
8309 return values which do not match prescribed defaults. */
8310 special_function_kind sfk = sfk_none;
8312 tree dname = NULL_TREE;
8313 tree ctor_return_type = NULL_TREE;
8314 enum overload_flags flags = NO_SPECIAL;
8315 /* cv-qualifiers that apply to the declarator, for a declaration of
8316 a member function. */
8317 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8318 /* virt-specifiers that apply to the declarator, for a declaration of
8319 a member function. */
8320 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8321 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8323 tree raises = NULL_TREE;
8324 int template_count = 0;
8325 tree returned_attrs = NULL_TREE;
8326 tree parms = NULL_TREE;
8327 const cp_declarator *id_declarator;
8328 /* The unqualified name of the declarator; either an
8329 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8330 tree unqualified_id;
8331 /* The class type, if any, in which this entity is located,
8332 or NULL_TREE if none. Note that this value may be different from
8333 the current class type; for example if an attempt is made to declare
8334 "A::f" inside "B", this value will be "A". */
8335 tree ctype = current_class_type;
8336 /* The NAMESPACE_DECL for the namespace in which this entity is
8337 located. If an unqualified name is used to declare the entity,
8338 this value will be NULL_TREE, even if the entity is located at
8340 tree in_namespace = NULL_TREE;
8341 cp_storage_class storage_class;
8342 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8343 bool type_was_error_mark_node = false;
8344 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8345 bool template_type_arg = false;
8346 bool template_parm_flag = false;
8347 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8350 signed_p = declspecs->specs[(int)ds_signed];
8351 unsigned_p = declspecs->specs[(int)ds_unsigned];
8352 short_p = declspecs->specs[(int)ds_short];
8353 long_p = declspecs->specs[(int)ds_long];
8354 longlong = declspecs->specs[(int)ds_long] >= 2;
8355 explicit_int128 = declspecs->explicit_int128_p;
8356 thread_p = declspecs->specs[(int)ds_thread];
8358 if (decl_context == FUNCDEF)
8359 funcdef_flag = true, decl_context = NORMAL;
8360 else if (decl_context == MEMFUNCDEF)
8361 funcdef_flag = true, decl_context = FIELD;
8362 else if (decl_context == BITFIELD)
8363 bitfield = 1, decl_context = FIELD;
8364 else if (decl_context == TEMPLATE_TYPE_ARG)
8365 template_type_arg = true, decl_context = TYPENAME;
8366 else if (decl_context == TPARM)
8367 template_parm_flag = true, decl_context = PARM;
8369 if (initialized > 1)
8370 funcdef_flag = true;
8372 /* Look inside a declarator for the name being declared
8373 and get it as a string, for an error message. */
8374 for (id_declarator = declarator;
8376 id_declarator = id_declarator->declarator)
8378 if (id_declarator->kind != cdk_id)
8379 innermost_code = id_declarator->kind;
8381 switch (id_declarator->kind)
8384 if (id_declarator->declarator
8385 && id_declarator->declarator->kind == cdk_id)
8387 sfk = id_declarator->declarator->u.id.sfk;
8388 if (sfk == sfk_destructor)
8395 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8396 tree decl = id_declarator->u.id.unqualified_name;
8399 if (qualifying_scope)
8401 if (at_function_scope_p ())
8405 A declarator-id shall not be qualified except
8408 None of the cases are permitted in block
8410 if (qualifying_scope == global_namespace)
8411 error ("invalid use of qualified-name %<::%D%>",
8413 else if (TYPE_P (qualifying_scope))
8414 error ("invalid use of qualified-name %<%T::%D%>",
8415 qualifying_scope, decl);
8417 error ("invalid use of qualified-name %<%D::%D%>",
8418 qualifying_scope, decl);
8419 return error_mark_node;
8421 else if (TYPE_P (qualifying_scope))
8423 ctype = qualifying_scope;
8424 if (!MAYBE_CLASS_TYPE_P (ctype))
8426 error ("%q#T is not a class or a namespace", ctype);
8429 else if (innermost_code != cdk_function
8430 && current_class_type
8431 && !UNIQUELY_DERIVED_FROM_P (ctype,
8432 current_class_type))
8434 error ("type %qT is not derived from type %qT",
8435 ctype, current_class_type);
8436 return error_mark_node;
8439 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8440 in_namespace = qualifying_scope;
8442 switch (TREE_CODE (decl))
8448 if (innermost_code != cdk_function)
8450 error ("declaration of %qD as non-function", decl);
8451 return error_mark_node;
8453 else if (!qualifying_scope
8454 && !(current_class_type && at_class_scope_p ()))
8456 error ("declaration of %qD as non-member", decl);
8457 return error_mark_node;
8460 type = TREE_OPERAND (decl, 0);
8462 type = constructor_name (type);
8463 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8468 case TEMPLATE_ID_EXPR:
8470 tree fns = TREE_OPERAND (decl, 0);
8473 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8475 gcc_assert (is_overloaded_fn (dname));
8476 dname = DECL_NAME (get_first_fn (dname));
8481 case IDENTIFIER_NODE:
8482 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8485 if (C_IS_RESERVED_WORD (dname))
8487 error ("declarator-id missing; using reserved word %qD",
8489 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8491 else if (!IDENTIFIER_TYPENAME_P (dname))
8492 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8495 gcc_assert (flags == NO_SPECIAL);
8496 flags = TYPENAME_FLAG;
8497 ctor_return_type = TREE_TYPE (dname);
8498 sfk = sfk_conversion;
8499 if (is_typename_at_global_scope (dname))
8500 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8502 name = "<invalid operator>";
8519 return error_mark_node;
8524 if (id_declarator->kind == cdk_id)
8530 The declarator in a function-definition shall have the form
8531 D1 ( parameter-declaration-clause) ... */
8532 if (funcdef_flag && innermost_code != cdk_function)
8534 error ("function definition does not declare parameters");
8535 return error_mark_node;
8538 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8539 && innermost_code != cdk_function
8540 && ! (ctype && !declspecs->any_specifiers_p))
8542 error ("declaration of %qD as non-function", dname);
8543 return error_mark_node;
8547 && TREE_CODE (dname) == IDENTIFIER_NODE
8548 && UDLIT_OPER_P (dname)
8549 && innermost_code != cdk_function)
8551 error ("declaration of %qD as non-function", dname);
8552 return error_mark_node;
8555 if (dname && IDENTIFIER_OPNAME_P (dname))
8557 if (declspecs->specs[(int)ds_typedef])
8559 error ("declaration of %qD as %<typedef%>", dname);
8560 return error_mark_node;
8562 else if (decl_context == PARM || decl_context == CATCHPARM)
8564 error ("declaration of %qD as parameter", dname);
8565 return error_mark_node;
8569 /* Anything declared one level down from the top level
8570 must be one of the parameters of a function
8571 (because the body is at least two levels down). */
8573 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8574 by not allowing C++ class definitions to specify their parameters
8575 with xdecls (must be spec.d in the parmlist).
8577 Since we now wait to push a class scope until we are sure that
8578 we are in a legitimate method context, we must set oldcname
8579 explicitly (since current_class_name is not yet alive).
8581 We also want to avoid calling this a PARM if it is in a namespace. */
8583 if (decl_context == NORMAL && !toplevel_bindings_p ())
8585 cp_binding_level *b = current_binding_level;
8586 current_binding_level = b->level_chain;
8587 if (current_binding_level != 0 && toplevel_bindings_p ())
8588 decl_context = PARM;
8589 current_binding_level = b;
8593 name = decl_context == PARM ? "parameter" : "type name";
8595 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8597 error ("%<constexpr%> cannot appear in a typedef declaration");
8598 return error_mark_node;
8601 /* If there were multiple types specified in the decl-specifier-seq,
8602 issue an error message. */
8603 if (declspecs->multiple_types_p)
8605 error ("two or more data types in declaration of %qs", name);
8606 return error_mark_node;
8609 if (declspecs->conflicting_specifiers_p)
8611 error ("conflicting specifiers in declaration of %qs", name);
8612 return error_mark_node;
8615 /* Extract the basic type from the decl-specifier-seq. */
8616 type = declspecs->type;
8617 if (type == error_mark_node)
8620 type_was_error_mark_node = true;
8622 /* If the entire declaration is itself tagged as deprecated then
8623 suppress reports of deprecated items. */
8624 if (type && TREE_DEPRECATED (type)
8625 && deprecated_state != DEPRECATED_SUPPRESS)
8626 warn_deprecated_use (type, NULL_TREE);
8627 if (type && TREE_CODE (type) == TYPE_DECL)
8629 typedef_decl = type;
8630 type = TREE_TYPE (typedef_decl);
8631 if (TREE_DEPRECATED (type)
8632 && DECL_ARTIFICIAL (typedef_decl)
8633 && deprecated_state != DEPRECATED_SUPPRESS)
8634 warn_deprecated_use (type, NULL_TREE);
8636 /* No type at all: default to `int', and set DEFAULTED_INT
8637 because it was not a user-defined typedef. */
8638 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8640 /* These imply 'int'. */
8641 type = integer_type_node;
8645 explicit_int = declspecs->explicit_int_p;
8646 explicit_char = declspecs->explicit_char_p;
8649 /* See the code below that used this. */
8651 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8653 typedef_type = type;
8656 if (sfk != sfk_conversion)
8657 ctor_return_type = ctype;
8659 if (sfk != sfk_none)
8660 type = check_special_function_return_type (sfk, type,
8662 else if (type == NULL_TREE)
8668 /* We handle `main' specially here, because 'main () { }' is so
8669 common. With no options, it is allowed. With -Wreturn-type,
8670 it is a warning. It is only an error with -pedantic-errors. */
8671 is_main = (funcdef_flag
8672 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8673 && MAIN_NAME_P (dname)
8674 && ctype == NULL_TREE
8675 && in_namespace == NULL_TREE
8676 && current_namespace == global_namespace);
8678 if (type_was_error_mark_node)
8679 /* We've already issued an error, don't complain more. */;
8680 else if (in_system_header || flag_ms_extensions)
8681 /* Allow it, sigh. */;
8683 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8685 pedwarn (input_location, OPT_pedantic,
8686 "ISO C++ forbids declaration of %qs with no type", name);
8688 warning (OPT_Wreturn_type,
8689 "ISO C++ forbids declaration of %qs with no type", name);
8691 type = integer_type_node;
8696 if (explicit_int128)
8698 if (int128_integer_type_node == NULL_TREE)
8700 error ("%<__int128%> is not supported by this target");
8701 explicit_int128 = false;
8703 else if (pedantic && ! in_system_header)
8704 pedwarn (input_location, OPT_pedantic,
8705 "ISO C++ does not support %<__int128%> for %qs", name);
8708 /* Now process the modifiers that were specified
8709 and check for invalid combinations. */
8711 /* Long double is a special combination. */
8712 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8715 type = cp_build_qualified_type (long_double_type_node,
8716 cp_type_quals (type));
8719 /* Check all other uses of type modifiers. */
8721 if (unsigned_p || signed_p || long_p || short_p)
8725 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8726 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8727 else if (signed_p && unsigned_p)
8728 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8729 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8730 error ("%<long long%> invalid for %qs", name);
8731 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8732 error ("%<long%> invalid for %qs", name);
8733 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8734 error ("%<short%> invalid for %qs", name);
8735 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8736 error ("%<long%> or %<short%> invalid for %qs", name);
8737 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8738 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8739 else if ((long_p || short_p) && explicit_char)
8740 error ("%<long%> or %<short%> specified with char for %qs", name);
8741 else if (long_p && short_p)
8742 error ("%<long%> and %<short%> specified together for %qs", name);
8743 else if (type == char16_type_node || type == char32_type_node)
8745 if (signed_p || unsigned_p)
8746 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8747 else if (short_p || long_p)
8748 error ("%<short%> or %<long%> invalid for %qs", name);
8753 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8755 pedwarn (input_location, OPT_pedantic,
8756 "long, short, signed or unsigned used invalidly for %qs",
8758 if (flag_pedantic_errors)
8763 /* Discard the type modifiers if they are invalid. */
8774 /* Decide whether an integer type is signed or not.
8775 Optionally treat bitfields as signed by default. */
8779 It is implementation-defined whether a plain (neither
8780 explicitly signed or unsigned) char, short, int, or long
8781 bit-field is signed or unsigned.
8783 Naturally, we extend this to long long as well. Note that
8784 this does not include wchar_t. */
8785 || (bitfield && !flag_signed_bitfields
8787 /* A typedef for plain `int' without `signed' can be
8788 controlled just like plain `int', but a typedef for
8789 `signed int' cannot be so controlled. */
8791 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8792 && TREE_CODE (type) == INTEGER_TYPE
8793 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8795 if (explicit_int128)
8796 type = int128_unsigned_type_node;
8798 type = long_long_unsigned_type_node;
8800 type = long_unsigned_type_node;
8802 type = short_unsigned_type_node;
8803 else if (type == char_type_node)
8804 type = unsigned_char_type_node;
8805 else if (typedef_decl)
8806 type = unsigned_type_for (type);
8808 type = unsigned_type_node;
8810 else if (signed_p && type == char_type_node)
8811 type = signed_char_type_node;
8812 else if (explicit_int128)
8813 type = int128_integer_type_node;
8815 type = long_long_integer_type_node;
8817 type = long_integer_type_node;
8819 type = short_integer_type_node;
8821 if (declspecs->specs[(int)ds_complex])
8823 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8824 error ("complex invalid for %qs", name);
8825 /* If we just have "complex", it is equivalent to
8826 "complex double", but if any modifiers at all are specified it is
8827 the complex form of TYPE. E.g, "complex short" is
8828 "complex short int". */
8829 else if (defaulted_int && ! longlong && ! explicit_int128
8830 && ! (long_p || short_p || signed_p || unsigned_p))
8831 type = complex_double_type_node;
8832 else if (type == integer_type_node)
8833 type = complex_integer_type_node;
8834 else if (type == float_type_node)
8835 type = complex_float_type_node;
8836 else if (type == double_type_node)
8837 type = complex_double_type_node;
8838 else if (type == long_double_type_node)
8839 type = complex_long_double_type_node;
8841 type = build_complex_type (type);
8844 type_quals = TYPE_UNQUALIFIED;
8845 if (declspecs->specs[(int)ds_const])
8846 type_quals |= TYPE_QUAL_CONST;
8847 if (declspecs->specs[(int)ds_volatile])
8848 type_quals |= TYPE_QUAL_VOLATILE;
8849 if (declspecs->specs[(int)ds_restrict])
8850 type_quals |= TYPE_QUAL_RESTRICT;
8851 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8852 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8855 type_quals |= cp_type_quals (type);
8856 type = cp_build_qualified_type_real
8857 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8858 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8859 /* We might have ignored or rejected some of the qualifiers. */
8860 type_quals = cp_type_quals (type);
8863 inlinep = !! declspecs->specs[(int)ds_inline];
8864 virtualp = !! declspecs->specs[(int)ds_virtual];
8865 explicitp = !! declspecs->specs[(int)ds_explicit];
8867 storage_class = declspecs->storage_class;
8868 if (storage_class == sc_static)
8869 staticp = 1 + (decl_context == FIELD);
8871 if (virtualp && staticp == 2)
8873 error ("member %qD cannot be declared both virtual and static", dname);
8874 storage_class = sc_none;
8877 friendp = !! declspecs->specs[(int)ds_friend];
8879 if (dependent_name && !friendp)
8881 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8882 return error_mark_node;
8885 /* Issue errors about use of storage classes for parameters. */
8886 if (decl_context == PARM)
8888 if (declspecs->specs[(int)ds_typedef])
8890 error ("typedef declaration invalid in parameter declaration");
8891 return error_mark_node;
8893 else if (template_parm_flag && storage_class != sc_none)
8895 error ("storage class specified for template parameter %qs", name);
8896 return error_mark_node;
8898 else if (storage_class == sc_static
8899 || storage_class == sc_extern
8901 error ("storage class specifiers invalid in parameter declarations");
8903 /* Function parameters cannot be constexpr. If we saw one, moan
8904 and pretend it wasn't there. */
8907 error ("a parameter cannot be declared %<constexpr%>");
8912 /* Give error if `virtual' is used outside of class declaration. */
8914 && (current_class_name == NULL_TREE || decl_context != FIELD))
8916 error ("%<virtual%> outside class declaration");
8920 /* Static anonymous unions are dealt with here. */
8921 if (staticp && decl_context == TYPENAME
8923 && ANON_AGGR_TYPE_P (declspecs->type))
8924 decl_context = FIELD;
8926 /* Warn about storage classes that are invalid for certain
8927 kinds of declarations (parameters, typenames, etc.). */
8930 && storage_class != sc_extern
8931 && storage_class != sc_static)
8932 || declspecs->specs[(int)ds_typedef]))
8934 error ("multiple storage classes in declaration of %qs", name);
8937 if (decl_context != NORMAL
8938 && ((storage_class != sc_none
8939 && storage_class != sc_mutable)
8942 if ((decl_context == PARM || decl_context == CATCHPARM)
8943 && (storage_class == sc_register
8944 || storage_class == sc_auto))
8946 else if (declspecs->specs[(int)ds_typedef])
8948 else if (decl_context == FIELD
8949 /* C++ allows static class elements. */
8950 && storage_class == sc_static)
8951 /* C++ also allows inlines and signed and unsigned elements,
8952 but in those cases we don't come in here. */
8956 if (decl_context == FIELD)
8957 error ("storage class specified for %qs", name);
8960 if (decl_context == PARM || decl_context == CATCHPARM)
8961 error ("storage class specified for parameter %qs", name);
8963 error ("storage class specified for typename");
8965 if (storage_class == sc_register
8966 || storage_class == sc_auto
8967 || storage_class == sc_extern
8969 storage_class = sc_none;
8972 else if (storage_class == sc_extern && funcdef_flag
8973 && ! toplevel_bindings_p ())
8974 error ("nested function %qs declared %<extern%>", name);
8975 else if (toplevel_bindings_p ())
8977 if (storage_class == sc_auto)
8978 error ("top-level declaration of %qs specifies %<auto%>", name);
8981 && storage_class != sc_extern
8982 && storage_class != sc_static)
8984 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8989 if (storage_class && friendp)
8991 error ("storage class specifiers invalid in friend function declarations");
8992 storage_class = sc_none;
8997 unqualified_id = NULL_TREE;
9000 unqualified_id = id_declarator->u.id.unqualified_name;
9001 switch (TREE_CODE (unqualified_id))
9004 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9005 if (TYPE_P (unqualified_id))
9006 unqualified_id = constructor_name (unqualified_id);
9009 case IDENTIFIER_NODE:
9010 case TEMPLATE_ID_EXPR:
9018 /* Determine the type of the entity declared by recurring on the
9020 for (; declarator; declarator = declarator->declarator)
9022 const cp_declarator *inner_declarator;
9025 if (type == error_mark_node)
9026 return error_mark_node;
9028 attrs = declarator->attributes;
9034 if (declarator == NULL || declarator->kind == cdk_id)
9035 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9036 if (declarator->kind == cdk_function)
9037 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9038 if (declarator->kind == cdk_array)
9039 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9040 returned_attrs = decl_attributes (&type,
9041 chainon (returned_attrs, attrs),
9045 if (declarator->kind == cdk_id)
9048 inner_declarator = declarator->declarator;
9050 switch (declarator->kind)
9053 type = create_array_type_for_decl (dname, type,
9054 declarator->u.array.bounds);
9062 /* Declaring a function type.
9063 Make sure we have a valid type for the function to return. */
9065 if (type_quals != TYPE_UNQUALIFIED)
9067 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9068 warning (OPT_Wignored_qualifiers,
9069 "type qualifiers ignored on function return type");
9070 /* We now know that the TYPE_QUALS don't apply to the
9071 decl, but to its return type. */
9072 type_quals = TYPE_UNQUALIFIED;
9074 errmsg = targetm.invalid_return_type (type);
9078 type = integer_type_node;
9081 /* Error about some types functions can't return. */
9083 if (TREE_CODE (type) == FUNCTION_TYPE)
9085 error ("%qs declared as function returning a function", name);
9086 return error_mark_node;
9088 if (TREE_CODE (type) == ARRAY_TYPE)
9090 error ("%qs declared as function returning an array", name);
9091 return error_mark_node;
9094 /* Pick up type qualifiers which should be applied to `this'. */
9095 memfn_quals = declarator->u.function.qualifiers;
9096 /* Pick up virt-specifiers. */
9097 virt_specifiers = declarator->u.function.virt_specifiers;
9098 /* Pick up the exception specifications. */
9099 raises = declarator->u.function.exception_specification;
9100 /* If the exception-specification is ill-formed, let's pretend
9101 there wasn't one. */
9102 if (raises == error_mark_node)
9105 /* Say it's a definition only for the CALL_EXPR
9106 closest to the identifier. */
9107 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9109 /* Handle a late-specified return type. */
9112 if (type_uses_auto (type))
9114 if (!declarator->u.function.late_return_type)
9116 error ("%qs function uses %<auto%> type specifier without"
9117 " late return type", name);
9118 return error_mark_node;
9120 else if (!is_auto (type))
9122 error ("%qs function with late return type has"
9123 " %qT as its type rather than plain %<auto%>",
9125 return error_mark_node;
9128 else if (declarator->u.function.late_return_type)
9130 error ("%qs function with late return type not declared"
9131 " with %<auto%> type specifier", name);
9132 return error_mark_node;
9135 type = splice_late_return_type
9136 (type, declarator->u.function.late_return_type);
9137 if (type == error_mark_node)
9138 return error_mark_node;
9140 if (ctype == NULL_TREE
9141 && decl_context == FIELD
9143 && (friendp == 0 || dname == current_class_name))
9144 ctype = current_class_type;
9146 if (ctype && (sfk == sfk_constructor
9147 || sfk == sfk_destructor))
9149 /* We are within a class's scope. If our declarator name
9150 is the same as the class name, and we are defining
9151 a function, then it is a constructor/destructor, and
9152 therefore returns a void type. */
9154 /* ISO C++ 12.4/2. A destructor may not be declared
9155 const or volatile. A destructor may not be
9158 ISO C++ 12.1. A constructor may not be declared
9159 const or volatile. A constructor may not be
9160 virtual. A constructor may not be static. */
9162 error ((flags == DTOR_FLAG)
9163 ? G_("destructor cannot be static member function")
9164 : G_("constructor cannot be static member function"));
9167 error ((flags == DTOR_FLAG)
9168 ? G_("destructors may not be cv-qualified")
9169 : G_("constructors may not be cv-qualified"));
9170 memfn_quals = TYPE_UNQUALIFIED;
9173 if (decl_context == FIELD
9174 && !member_function_or_else (ctype,
9177 return error_mark_node;
9179 if (flags != DTOR_FLAG)
9181 /* It's a constructor. */
9186 permerror (input_location, "constructors cannot be declared virtual");
9189 if (decl_context == FIELD
9190 && sfk != sfk_constructor)
9191 return error_mark_node;
9193 if (decl_context == FIELD)
9199 error ("can%'t initialize friend function %qs", name);
9202 /* Cannot be both friend and virtual. */
9203 error ("virtual functions cannot be friends");
9206 if (decl_context == NORMAL)
9207 error ("friend declaration not in class definition");
9208 if (current_function_decl && funcdef_flag)
9209 error ("can%'t define friend function %qs in a local "
9213 else if (ctype && sfk == sfk_conversion)
9217 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9222 arg_types = grokparms (declarator->u.function.parameters,
9225 if (inner_declarator
9226 && inner_declarator->kind == cdk_id
9227 && inner_declarator->u.id.sfk == sfk_destructor
9228 && arg_types != void_list_node)
9230 error ("destructors may not have parameters");
9231 arg_types = void_list_node;
9235 type = build_function_type (type, arg_types);
9242 /* Filter out pointers-to-references and references-to-references.
9243 We can get these if a TYPE_DECL is used. */
9245 if (TREE_CODE (type) == REFERENCE_TYPE)
9247 if (declarator->kind != cdk_reference)
9249 error ("cannot declare pointer to %q#T", type);
9250 type = TREE_TYPE (type);
9253 /* In C++0x, we allow reference to reference declarations
9254 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9255 and template type arguments [14.3.1/4 temp.arg.type]. The
9256 check for direct reference to reference declarations, which
9257 are still forbidden, occurs below. Reasoning behind the change
9258 can be found in DR106, DR540, and the rvalue reference
9260 else if (cxx_dialect == cxx98)
9262 error ("cannot declare reference to %q#T", type);
9263 type = TREE_TYPE (type);
9266 else if (VOID_TYPE_P (type))
9268 if (declarator->kind == cdk_reference)
9269 error ("cannot declare reference to %q#T", type);
9270 else if (declarator->kind == cdk_ptrmem)
9271 error ("cannot declare pointer to %q#T member", type);
9274 /* We now know that the TYPE_QUALS don't apply to the decl,
9275 but to the target of the pointer. */
9276 type_quals = TYPE_UNQUALIFIED;
9278 if (declarator->kind == cdk_ptrmem
9279 && (TREE_CODE (type) == FUNCTION_TYPE
9280 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9282 memfn_quals |= type_memfn_quals (type);
9283 type = build_memfn_type (type,
9284 declarator->u.pointer.class_type,
9286 if (type == error_mark_node)
9287 return error_mark_node;
9288 memfn_quals = TYPE_UNQUALIFIED;
9291 if (TREE_CODE (type) == FUNCTION_TYPE
9292 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9293 error (declarator->kind == cdk_reference
9294 ? G_("cannot declare reference to qualified function type %qT")
9295 : G_("cannot declare pointer to qualified function type %qT"),
9298 /* When the pointed-to type involves components of variable size,
9299 care must be taken to ensure that the size evaluation code is
9300 emitted early enough to dominate all the possible later uses
9301 and late enough for the variables on which it depends to have
9304 This is expected to happen automatically when the pointed-to
9305 type has a name/declaration of it's own, but special attention
9306 is required if the type is anonymous.
9308 We handle the NORMAL and FIELD contexts here by inserting a
9309 dummy statement that just evaluates the size at a safe point
9310 and ensures it is not deferred until e.g. within a deeper
9311 conditional context (c++/43555).
9313 We expect nothing to be needed here for PARM or TYPENAME.
9314 Evaluating the size at this point for TYPENAME would
9315 actually be incorrect, as we might be in the middle of an
9316 expression with side effects on the pointed-to type size
9317 "arguments" prior to the pointer declaration point and the
9318 size evaluation could end up prior to the side effects. */
9320 if (!TYPE_NAME (type)
9321 && (decl_context == NORMAL || decl_context == FIELD)
9322 && at_function_scope_p ()
9323 && variably_modified_type_p (type, NULL_TREE))
9325 /* First break out any side-effects. */
9326 stabilize_vla_size (TYPE_SIZE (type));
9327 /* And then force evaluation of the SAVE_EXPR. */
9328 finish_expr_stmt (TYPE_SIZE (type));
9331 if (declarator->kind == cdk_reference)
9333 /* In C++0x, the type we are creating a reference to might be
9334 a typedef which is itself a reference type. In that case,
9335 we follow the reference collapsing rules in
9336 [7.1.3/8 dcl.typedef] to create the final reference type:
9338 "If a typedef TD names a type that is a reference to a type
9339 T, an attempt to create the type 'lvalue reference to cv TD'
9340 creates the type 'lvalue reference to T,' while an attempt
9341 to create the type "rvalue reference to cv TD' creates the
9344 if (VOID_TYPE_P (type))
9345 /* We already gave an error. */;
9346 else if (TREE_CODE (type) == REFERENCE_TYPE)
9348 if (declarator->u.reference.rvalue_ref)
9349 /* Leave type alone. */;
9351 type = cp_build_reference_type (TREE_TYPE (type), false);
9354 type = cp_build_reference_type
9355 (type, declarator->u.reference.rvalue_ref);
9357 /* In C++0x, we need this check for direct reference to
9358 reference declarations, which are forbidden by
9359 [8.3.2/5 dcl.ref]. Reference to reference declarations
9360 are only allowed indirectly through typedefs and template
9361 type arguments. Example:
9363 void foo(int & &); // invalid ref-to-ref decl
9365 typedef int & int_ref;
9366 void foo(int_ref &); // valid ref-to-ref decl
9368 if (inner_declarator && inner_declarator->kind == cdk_reference)
9369 error ("cannot declare reference to %q#T, which is not "
9370 "a typedef or a template type argument", type);
9372 else if (TREE_CODE (type) == METHOD_TYPE)
9373 type = build_ptrmemfunc_type (build_pointer_type (type));
9374 else if (declarator->kind == cdk_ptrmem)
9376 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9378 if (declarator->u.pointer.class_type == error_mark_node)
9379 /* We will already have complained. */
9380 type = error_mark_node;
9382 type = build_ptrmem_type (declarator->u.pointer.class_type,
9386 type = build_pointer_type (type);
9388 /* Process a list of type modifier keywords (such as
9389 const or volatile) that were given inside the `*' or `&'. */
9391 if (declarator->u.pointer.qualifiers)
9394 = cp_build_qualified_type (type,
9395 declarator->u.pointer.qualifiers);
9396 type_quals = cp_type_quals (type);
9409 /* We need to stabilize side-effects in VLA sizes for regular array
9410 declarations too, not just pointers to arrays. */
9411 if (type != error_mark_node && !TYPE_NAME (type)
9412 && (decl_context == NORMAL || decl_context == FIELD)
9413 && at_function_scope_p ()
9414 && variably_modified_type_p (type, NULL_TREE))
9415 stabilize_vla_size (TYPE_SIZE (type));
9417 /* A `constexpr' specifier used in an object declaration declares
9418 the object as `const'. */
9419 if (constexpr_p && innermost_code != cdk_function)
9421 if (type_quals & TYPE_QUAL_CONST)
9422 error ("both %<const%> and %<constexpr%> cannot be used here");
9423 if (type_quals & TYPE_QUAL_VOLATILE)
9424 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9425 if (TREE_CODE (type) != REFERENCE_TYPE)
9427 type_quals |= TYPE_QUAL_CONST;
9428 type = cp_build_qualified_type (type, type_quals);
9432 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9433 && TREE_CODE (type) != FUNCTION_TYPE
9434 && TREE_CODE (type) != METHOD_TYPE)
9436 error ("template-id %qD used as a declarator",
9438 unqualified_id = dname;
9441 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9442 qualified with a class-name, turn it into a METHOD_TYPE, unless
9443 we know that the function is static. We take advantage of this
9444 opportunity to do other processing that pertains to entities
9445 explicitly declared to be class members. Note that if DECLARATOR
9446 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9447 would not have exited the loop above. */
9449 && declarator->u.id.qualifying_scope
9450 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9454 ctype = declarator->u.id.qualifying_scope;
9455 ctype = TYPE_MAIN_VARIANT (ctype);
9457 while (t != NULL_TREE && CLASS_TYPE_P (t))
9459 /* You're supposed to have one `template <...>' for every
9460 template class, but you don't need one for a full
9461 specialization. For example:
9463 template <class T> struct S{};
9464 template <> struct S<int> { void f(); };
9465 void S<int>::f () {}
9467 is correct; there shouldn't be a `template <>' for the
9468 definition of `S<int>::f'. */
9469 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9470 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9471 /* T is an explicit (not partial) specialization. All
9472 containing classes must therefore also be explicitly
9475 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9476 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9477 template_count += 1;
9479 t = TYPE_MAIN_DECL (t);
9480 t = DECL_CONTEXT (t);
9483 if (ctype == current_class_type)
9487 permerror (input_location, "member functions are implicitly friends of their class");
9491 permerror (declarator->id_loc,
9492 "extra qualification %<%T::%> on member %qs",
9495 else if (/* If the qualifying type is already complete, then we
9496 can skip the following checks. */
9497 !COMPLETE_TYPE_P (ctype)
9498 && (/* If the function is being defined, then
9499 qualifying type must certainly be complete. */
9501 /* A friend declaration of "T::f" is OK, even if
9502 "T" is a template parameter. But, if this
9503 function is not a friend, the qualifying type
9505 || (!friendp && !CLASS_TYPE_P (ctype))
9506 /* For a declaration, the type need not be
9507 complete, if either it is dependent (since there
9508 is no meaningful definition of complete in that
9509 case) or the qualifying class is currently being
9511 || !(dependent_type_p (ctype)
9512 || currently_open_class (ctype)))
9513 /* Check that the qualifying type is complete. */
9514 && !complete_type_or_else (ctype, NULL_TREE))
9515 return error_mark_node;
9516 else if (TREE_CODE (type) == FUNCTION_TYPE)
9518 if (current_class_type
9519 && (!friendp || funcdef_flag))
9522 ? G_("cannot define member function %<%T::%s%> "
9524 : G_("cannot declare member function %<%T::%s%> "
9526 ctype, name, current_class_type);
9527 return error_mark_node;
9530 else if (declspecs->specs[(int)ds_typedef]
9531 && current_class_type)
9533 error ("cannot declare member %<%T::%s%> within %qT",
9534 ctype, name, current_class_type);
9535 return error_mark_node;
9539 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9540 ctype = current_class_type;
9542 /* Now TYPE has the actual type. */
9547 *attrlist = chainon (returned_attrs, *attrlist);
9549 attrlist = &returned_attrs;
9552 /* Handle parameter packs. */
9553 if (parameter_pack_p)
9555 if (decl_context == PARM)
9556 /* Turn the type into a pack expansion.*/
9557 type = make_pack_expansion (type);
9559 error ("non-parameter %qs cannot be a parameter pack", name);
9562 /* Did array size calculations overflow? */
9564 if (TREE_CODE (type) == ARRAY_TYPE
9565 && COMPLETE_TYPE_P (type)
9566 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9567 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9569 error ("size of array %qs is too large", name);
9570 /* If we proceed with the array type as it is, we'll eventually
9571 crash in tree_low_cst(). */
9572 type = error_mark_node;
9575 if ((decl_context == FIELD || decl_context == PARM)
9576 && !processing_template_decl
9577 && variably_modified_type_p (type, NULL_TREE))
9579 if (decl_context == FIELD)
9580 error ("data member may not have variably modified type %qT", type);
9582 error ("parameter may not have variably modified type %qT", type);
9583 type = error_mark_node;
9586 if (explicitp == 1 || (explicitp && friendp))
9588 /* [dcl.fct.spec] The explicit specifier shall only be used in
9589 declarations of constructors within a class definition. */
9590 error ("only declarations of constructors can be %<explicit%>");
9594 if (storage_class == sc_mutable)
9596 if (decl_context != FIELD || friendp)
9598 error ("non-member %qs cannot be declared %<mutable%>", name);
9599 storage_class = sc_none;
9601 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9603 error ("non-object member %qs cannot be declared %<mutable%>", name);
9604 storage_class = sc_none;
9606 else if (TREE_CODE (type) == FUNCTION_TYPE
9607 || TREE_CODE (type) == METHOD_TYPE)
9609 error ("function %qs cannot be declared %<mutable%>", name);
9610 storage_class = sc_none;
9614 error ("static %qs cannot be declared %<mutable%>", name);
9615 storage_class = sc_none;
9617 else if (type_quals & TYPE_QUAL_CONST)
9619 error ("const %qs cannot be declared %<mutable%>", name);
9620 storage_class = sc_none;
9622 else if (TREE_CODE (type) == REFERENCE_TYPE)
9624 permerror (input_location, "reference %qs cannot be declared "
9625 "%<mutable%>", name);
9626 storage_class = sc_none;
9630 /* If this is declaring a typedef name, return a TYPE_DECL. */
9631 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9635 /* Note that the grammar rejects storage classes
9636 in typenames, fields or parameters. */
9637 if (current_lang_name == lang_name_java)
9638 TYPE_FOR_JAVA (type) = 1;
9640 /* This declaration:
9642 typedef void f(int) const;
9644 declares a function type which is not a member of any
9645 particular class, but which is cv-qualified; for
9646 example "f S::*" declares a pointer to a const-qualified
9647 member function of S. We record the cv-qualification in the
9649 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9651 type = apply_memfn_quals (type, memfn_quals);
9653 /* We have now dealt with these qualifiers. */
9654 memfn_quals = TYPE_UNQUALIFIED;
9657 if (type_uses_auto (type))
9659 error ("typedef declared %<auto%>");
9660 type = error_mark_node;
9663 if (decl_context == FIELD)
9664 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9666 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9667 if (id_declarator && declarator->u.id.qualifying_scope) {
9668 error_at (DECL_SOURCE_LOCATION (decl),
9669 "typedef name may not be a nested-name-specifier");
9670 TREE_TYPE (decl) = error_mark_node;
9673 if (decl_context != FIELD)
9675 if (!current_function_decl)
9676 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9677 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9678 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9679 (current_function_decl)))
9680 /* The TYPE_DECL is "abstract" because there will be
9681 clones of this constructor/destructor, and there will
9682 be copies of this TYPE_DECL generated in those
9684 DECL_ABSTRACT (decl) = 1;
9686 else if (constructor_name_p (unqualified_id, current_class_type))
9687 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9688 "as enclosing class",
9691 /* If the user declares "typedef struct {...} foo" then the
9692 struct will have an anonymous name. Fill that name in now.
9693 Nothing can refer to it, so nothing needs know about the name
9695 if (type != error_mark_node
9698 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9699 && TYPE_ANONYMOUS_P (type)
9700 && declspecs->type_definition_p
9701 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9705 /* Replace the anonymous name with the real name everywhere. */
9706 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9708 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9709 /* We do not rename the debug info representing the
9710 anonymous tagged type because the standard says in
9711 [dcl.typedef] that the naming applies only for
9712 linkage purposes. */
9713 /*debug_hooks->set_name (t, decl);*/
9714 TYPE_NAME (t) = decl;
9717 if (TYPE_LANG_SPECIFIC (type))
9718 TYPE_WAS_ANONYMOUS (type) = 1;
9720 /* If this is a typedef within a template class, the nested
9721 type is a (non-primary) template. The name for the
9722 template needs updating as well. */
9723 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9724 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9725 = TYPE_IDENTIFIER (type);
9727 /* Adjust linkage now that we aren't anonymous anymore. */
9728 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9729 determine_visibility (TYPE_MAIN_DECL (type));
9731 /* FIXME remangle member functions; member functions of a
9732 type with external linkage have external linkage. */
9736 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9737 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9739 bad_specifiers (decl, BSP_TYPE, virtualp,
9740 memfn_quals != TYPE_UNQUALIFIED,
9741 inlinep, friendp, raises != NULL_TREE);
9746 /* Detect the case of an array type of unspecified size
9747 which came, as such, direct from a typedef name.
9748 We must copy the type, so that the array's domain can be
9749 individually set by the object's initializer. */
9751 if (type && typedef_type
9752 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9753 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9754 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9756 /* Detect where we're using a typedef of function type to declare a
9757 function. PARMS will not be set, so we must create it now. */
9759 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9761 tree decls = NULL_TREE;
9764 for (args = TYPE_ARG_TYPES (type);
9765 args && args != void_list_node;
9766 args = TREE_CHAIN (args))
9768 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9770 DECL_CHAIN (decl) = decls;
9774 parms = nreverse (decls);
9776 if (decl_context != TYPENAME)
9778 /* A cv-qualifier-seq shall only be part of the function type
9779 for a non-static member function. [8.3.5/4 dcl.fct] */
9780 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9781 && (current_class_type == NULL_TREE || staticp) )
9784 ? G_("qualified function types cannot be used to "
9785 "declare static member functions")
9786 : G_("qualified function types cannot be used to "
9787 "declare free functions"));
9788 type = TYPE_MAIN_VARIANT (type);
9791 /* The qualifiers on the function type become the qualifiers on
9792 the non-static member function. */
9793 memfn_quals |= type_memfn_quals (type);
9794 type_quals = TYPE_UNQUALIFIED;
9798 /* If this is a type name (such as, in a cast or sizeof),
9799 compute the type and return it now. */
9801 if (decl_context == TYPENAME)
9803 /* Note that the grammar rejects storage classes
9804 in typenames, fields or parameters. */
9805 if (type_quals != TYPE_UNQUALIFIED)
9806 type_quals = TYPE_UNQUALIFIED;
9808 /* Special case: "friend class foo" looks like a TYPENAME context. */
9811 if (type_quals != TYPE_UNQUALIFIED)
9813 error ("type qualifiers specified for friend class declaration");
9814 type_quals = TYPE_UNQUALIFIED;
9818 error ("%<inline%> specified for friend class declaration");
9824 /* Don't allow friend declaration without a class-key. */
9825 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9826 permerror (input_location, "template parameters cannot be friends");
9827 else if (TREE_CODE (type) == TYPENAME_TYPE)
9828 permerror (input_location, "friend declaration requires class-key, "
9829 "i.e. %<friend class %T::%D%>",
9830 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9832 permerror (input_location, "friend declaration requires class-key, "
9833 "i.e. %<friend %#T%>",
9837 /* Only try to do this stuff if we didn't already give up. */
9838 if (type != integer_type_node)
9840 /* A friendly class? */
9841 if (current_class_type)
9842 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9845 error ("trying to make class %qT a friend of global scope",
9848 type = void_type_node;
9851 else if (memfn_quals)
9853 if (ctype == NULL_TREE
9854 && TREE_CODE (type) == METHOD_TYPE)
9855 ctype = TYPE_METHOD_BASETYPE (type);
9858 type = build_memfn_type (type, ctype, memfn_quals);
9859 /* Core issue #547: need to allow this in template type args. */
9860 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9861 type = apply_memfn_quals (type, memfn_quals);
9863 error ("invalid qualifiers on non-member function type");
9868 else if (unqualified_id == NULL_TREE && decl_context != PARM
9869 && decl_context != CATCHPARM
9870 && TREE_CODE (type) != UNION_TYPE
9873 error ("abstract declarator %qT used as declaration", type);
9874 return error_mark_node;
9877 /* Only functions may be declared using an operator-function-id. */
9879 && IDENTIFIER_OPNAME_P (unqualified_id)
9880 && TREE_CODE (type) != FUNCTION_TYPE
9881 && TREE_CODE (type) != METHOD_TYPE)
9883 error ("declaration of %qD as non-function", unqualified_id);
9884 return error_mark_node;
9887 /* We don't check parameter types here because we can emit a better
9888 error message later. */
9889 if (decl_context != PARM)
9891 type = check_var_type (unqualified_id, type);
9892 if (type == error_mark_node)
9893 return error_mark_node;
9896 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9897 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9899 if (decl_context == PARM || decl_context == CATCHPARM)
9901 if (ctype || in_namespace)
9902 error ("cannot use %<::%> in parameter declaration");
9904 if (type_uses_auto (type))
9906 error ("parameter declared %<auto%>");
9907 type = error_mark_node;
9910 /* A parameter declared as an array of T is really a pointer to T.
9911 One declared as a function is really a pointer to a function.
9912 One declared as a member is really a pointer to member. */
9914 if (TREE_CODE (type) == ARRAY_TYPE)
9916 /* Transfer const-ness of array into that of type pointed to. */
9917 type = build_pointer_type (TREE_TYPE (type));
9918 type_quals = TYPE_UNQUALIFIED;
9920 else if (TREE_CODE (type) == FUNCTION_TYPE)
9921 type = build_pointer_type (type);
9924 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9925 && !NEW_DELETE_OPNAME_P (unqualified_id))
9927 cp_cv_quals real_quals = memfn_quals;
9928 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9929 real_quals |= TYPE_QUAL_CONST;
9930 type = build_memfn_type (type, ctype, real_quals);
9936 if (decl_context == PARM)
9938 decl = cp_build_parm_decl (unqualified_id, type);
9940 bad_specifiers (decl, BSP_PARM, virtualp,
9941 memfn_quals != TYPE_UNQUALIFIED,
9942 inlinep, friendp, raises != NULL_TREE);
9944 else if (decl_context == FIELD)
9946 /* The C99 flexible array extension. */
9947 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9948 && TYPE_DOMAIN (type) == NULL_TREE)
9950 tree itype = compute_array_index_type (dname, integer_zero_node,
9951 tf_warning_or_error);
9952 type = build_cplus_array_type (TREE_TYPE (type), itype);
9955 if (type == error_mark_node)
9957 /* Happens when declaring arrays of sizes which
9958 are error_mark_node, for example. */
9961 else if (in_namespace && !friendp)
9963 /* Something like struct S { int N::j; }; */
9964 error ("invalid use of %<::%>");
9965 return error_mark_node;
9967 else if (TREE_CODE (type) == FUNCTION_TYPE
9968 || TREE_CODE (type) == METHOD_TYPE)
9971 tree function_context;
9975 /* This should never happen in pure C++ (the check
9976 could be an assert). It could happen in
9977 Objective-C++ if someone writes invalid code that
9978 uses a function declaration for an instance
9979 variable or property (instance variables and
9980 properties are parsed as FIELD_DECLs, but they are
9981 part of an Objective-C class, not a C++ class).
9982 That code is invalid and is caught by this
9986 error ("declaration of function %qD in invalid context",
9988 return error_mark_node;
9991 /* ``A union may [ ... ] not [ have ] virtual functions.''
9993 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9995 error ("function %qD declared virtual inside a union",
9997 return error_mark_node;
10000 if (NEW_DELETE_OPNAME_P (unqualified_id))
10004 error ("%qD cannot be declared virtual, since it "
10005 "is always static",
10012 /* Check that the name used for a destructor makes sense. */
10013 if (sfk == sfk_destructor)
10015 tree uqname = id_declarator->u.id.unqualified_name;
10019 gcc_assert (friendp);
10020 error ("expected qualified name in friend declaration "
10021 "for destructor %qD", uqname);
10022 return error_mark_node;
10025 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10027 error ("declaration of %qD as member of %qT",
10029 return error_mark_node;
10033 error ("a destructor cannot be %<constexpr%>");
10034 return error_mark_node;
10037 else if (sfk == sfk_constructor && friendp && !ctype)
10039 error ("expected qualified name in friend declaration "
10040 "for constructor %qD",
10041 id_declarator->u.id.unqualified_name);
10042 return error_mark_node;
10045 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10046 function_context = (ctype != NULL_TREE) ?
10047 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10048 publicp = (! friendp || ! staticp)
10049 && function_context == NULL_TREE;
10050 decl = grokfndecl (ctype, type,
10051 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10052 ? unqualified_id : dname,
10055 virtualp, flags, memfn_quals, raises,
10056 friendp ? -1 : 0, friendp, publicp,
10057 inlinep | (2 * constexpr_p),
10059 funcdef_flag, template_count, in_namespace,
10060 attrlist, declarator->id_loc);
10061 decl = set_virt_specifiers (decl, virt_specifiers);
10062 if (decl == NULL_TREE)
10063 return error_mark_node;
10065 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10066 /* The decl and setting of decl_attr is also turned off. */
10067 decl = build_decl_attribute_variant (decl, decl_attr);
10070 /* [class.conv.ctor]
10072 A constructor declared without the function-specifier
10073 explicit that can be called with a single parameter
10074 specifies a conversion from the type of its first
10075 parameter to the type of its class. Such a constructor
10076 is called a converting constructor. */
10077 if (explicitp == 2)
10078 DECL_NONCONVERTING_P (decl) = 1;
10080 else if (!staticp && !dependent_type_p (type)
10081 && !COMPLETE_TYPE_P (complete_type (type))
10082 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10084 if (unqualified_id)
10085 error ("field %qD has incomplete type", unqualified_id);
10087 error ("name %qT has incomplete type", type);
10089 /* If we're instantiating a template, tell them which
10090 instantiation made the field's type be incomplete. */
10091 if (current_class_type
10092 && TYPE_NAME (current_class_type)
10093 && IDENTIFIER_TEMPLATE (current_class_name)
10095 && declspecs->type == type)
10096 error (" in instantiation of template %qT",
10097 current_class_type);
10099 return error_mark_node;
10105 error ("%qE is neither function nor member function; "
10106 "cannot be declared friend", unqualified_id);
10114 /* Friends are treated specially. */
10115 if (ctype == current_class_type)
10116 ; /* We already issued a permerror. */
10117 else if (decl && DECL_NAME (decl))
10119 if (template_class_depth (current_class_type) == 0)
10121 decl = check_explicit_specialization
10122 (unqualified_id, decl, template_count,
10123 2 * funcdef_flag + 4);
10124 if (decl == error_mark_node)
10125 return error_mark_node;
10128 decl = do_friend (ctype, unqualified_id, decl,
10134 return error_mark_node;
10137 /* Structure field. It may not be a function, except for C++. */
10139 if (decl == NULL_TREE)
10143 /* C++ allows static class members. All other work
10144 for this is done by grokfield. */
10145 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10146 set_linkage_for_static_data_member (decl);
10147 /* Even if there is an in-class initialization, DECL
10148 is considered undefined until an out-of-class
10149 definition is provided. */
10150 DECL_EXTERNAL (decl) = 1;
10153 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10155 if (constexpr_p && !initialized)
10157 error ("constexpr static data member %qD must have an "
10158 "initializer", decl);
10159 constexpr_p = false;
10166 error ("non-static data member %qE declared %<constexpr%>",
10168 constexpr_p = false;
10170 decl = build_decl (input_location,
10171 FIELD_DECL, unqualified_id, type);
10172 DECL_NONADDRESSABLE_P (decl) = bitfield;
10173 if (bitfield && !unqualified_id)
10174 TREE_NO_WARNING (decl) = 1;
10176 if (storage_class == sc_mutable)
10178 DECL_MUTABLE_P (decl) = 1;
10179 storage_class = sc_none;
10183 /* An attempt is being made to initialize a non-static
10184 member. This is new in C++11. */
10185 maybe_warn_cpp0x (CPP0X_NSDMI);
10188 bad_specifiers (decl, BSP_FIELD, virtualp,
10189 memfn_quals != TYPE_UNQUALIFIED,
10190 inlinep, friendp, raises != NULL_TREE);
10193 else if (TREE_CODE (type) == FUNCTION_TYPE
10194 || TREE_CODE (type) == METHOD_TYPE)
10196 tree original_name;
10199 if (!unqualified_id)
10200 return error_mark_node;
10202 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10203 original_name = dname;
10205 original_name = unqualified_id;
10207 if (storage_class == sc_auto)
10208 error ("storage class %<auto%> invalid for function %qs", name);
10209 else if (storage_class == sc_register)
10210 error ("storage class %<register%> invalid for function %qs", name);
10212 error ("storage class %<__thread%> invalid for function %qs", name);
10214 if (virt_specifiers)
10215 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10216 /* Function declaration not at top level.
10217 Storage classes other than `extern' are not allowed
10218 and `extern' makes no difference. */
10219 if (! toplevel_bindings_p ()
10220 && (storage_class == sc_static
10221 || declspecs->specs[(int)ds_inline])
10224 if (storage_class == sc_static)
10225 pedwarn (input_location, OPT_pedantic,
10226 "%<static%> specified invalid for function %qs "
10227 "declared out of global scope", name);
10229 pedwarn (input_location, OPT_pedantic,
10230 "%<inline%> specifier invalid for function %qs "
10231 "declared out of global scope", name);
10234 if (ctype == NULL_TREE)
10238 error ("virtual non-class function %qs", name);
10241 else if (sfk == sfk_constructor
10242 || sfk == sfk_destructor)
10244 error (funcdef_flag
10245 ? G_("%qs defined in a non-class scope")
10246 : G_("%qs declared in a non-class scope"), name);
10251 /* Record presence of `static'. */
10252 publicp = (ctype != NULL_TREE
10253 || storage_class == sc_extern
10254 || storage_class != sc_static);
10256 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10257 virtualp, flags, memfn_quals, raises,
10259 publicp, inlinep | (2 * constexpr_p), sfk,
10261 template_count, in_namespace, attrlist,
10262 declarator->id_loc);
10263 if (decl == NULL_TREE)
10264 return error_mark_node;
10268 int invalid_static = 0;
10270 /* Don't allow a static member function in a class, and forbid
10271 declaring main to be static. */
10272 if (TREE_CODE (type) == METHOD_TYPE)
10274 permerror (input_location, "cannot declare member function %qD to have "
10275 "static linkage", decl);
10276 invalid_static = 1;
10278 else if (current_function_decl)
10280 /* FIXME need arm citation */
10281 error ("cannot declare static function inside another function");
10282 invalid_static = 1;
10285 if (invalid_static)
10288 storage_class = sc_none;
10294 /* It's a variable. */
10296 /* An uninitialized decl with `extern' is a reference. */
10297 decl = grokvardecl (type, unqualified_id,
10300 (type_quals & TYPE_QUAL_CONST) != 0,
10301 ctype ? ctype : in_namespace);
10302 bad_specifiers (decl, BSP_VAR, virtualp,
10303 memfn_quals != TYPE_UNQUALIFIED,
10304 inlinep, friendp, raises != NULL_TREE);
10308 DECL_CONTEXT (decl) = ctype;
10311 permerror (input_location, "%<static%> may not be used when defining "
10312 "(as opposed to declaring) a static data member");
10314 storage_class = sc_none;
10316 if (storage_class == sc_register && TREE_STATIC (decl))
10318 error ("static member %qD declared %<register%>", decl);
10319 storage_class = sc_none;
10321 if (storage_class == sc_extern && pedantic)
10323 pedwarn (input_location, OPT_pedantic,
10324 "cannot explicitly declare member %q#D to have "
10325 "extern linkage", decl);
10326 storage_class = sc_none;
10329 else if (constexpr_p && DECL_EXTERNAL (decl))
10331 error ("declaration of constexpr variable %qD is not a definition",
10333 constexpr_p = false;
10337 if (storage_class == sc_extern && initialized && !funcdef_flag)
10339 if (toplevel_bindings_p ())
10341 /* It's common practice (and completely valid) to have a const
10342 be initialized and declared extern. */
10343 if (!(type_quals & TYPE_QUAL_CONST))
10344 warning (0, "%qs initialized and declared %<extern%>", name);
10348 error ("%qs has both %<extern%> and initializer", name);
10349 return error_mark_node;
10353 /* Record `register' declaration for warnings on &
10354 and in case doing stupid register allocation. */
10356 if (storage_class == sc_register)
10357 DECL_REGISTER (decl) = 1;
10358 else if (storage_class == sc_extern)
10359 DECL_THIS_EXTERN (decl) = 1;
10360 else if (storage_class == sc_static)
10361 DECL_THIS_STATIC (decl) = 1;
10363 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10364 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10365 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10367 /* Record constancy and volatility on the DECL itself . There's
10368 no need to do this when processing a template; we'll do this
10369 for the instantiated declaration based on the type of DECL. */
10370 if (!processing_template_decl)
10371 cp_apply_type_quals_to_decl (type_quals, decl);
10377 /* Subroutine of start_function. Ensure that each of the parameter
10378 types (as listed in PARMS) is complete, as is required for a
10379 function definition. */
10382 require_complete_types_for_parms (tree parms)
10384 for (; parms; parms = DECL_CHAIN (parms))
10386 if (dependent_type_p (TREE_TYPE (parms)))
10388 if (!VOID_TYPE_P (TREE_TYPE (parms))
10389 && complete_type_or_else (TREE_TYPE (parms), parms))
10391 relayout_decl (parms);
10392 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10395 /* grokparms or complete_type_or_else will have already issued
10397 TREE_TYPE (parms) = error_mark_node;
10401 /* Returns nonzero if T is a local variable. */
10404 local_variable_p (const_tree t)
10406 if ((TREE_CODE (t) == VAR_DECL
10407 /* A VAR_DECL with a context that is a _TYPE is a static data
10409 && !TYPE_P (CP_DECL_CONTEXT (t))
10410 /* Any other non-local variable must be at namespace scope. */
10411 && !DECL_NAMESPACE_SCOPE_P (t))
10412 || (TREE_CODE (t) == PARM_DECL))
10418 /* Like local_variable_p, but suitable for use as a tree-walking
10422 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10423 void *data ATTRIBUTE_UNUSED)
10425 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10427 else if (TYPE_P (*tp))
10428 *walk_subtrees = 0;
10434 /* Check that ARG, which is a default-argument expression for a
10435 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10436 something goes wrong. DECL may also be a _TYPE node, rather than a
10437 DECL, if there is no DECL available. */
10440 check_default_argument (tree decl, tree arg)
10445 if (TREE_CODE (arg) == DEFAULT_ARG)
10446 /* We get a DEFAULT_ARG when looking at an in-class declaration
10447 with a default argument. Ignore the argument for now; we'll
10448 deal with it after the class is complete. */
10457 decl_type = TREE_TYPE (decl);
10459 if (arg == error_mark_node
10460 || decl == error_mark_node
10461 || TREE_TYPE (arg) == error_mark_node
10462 || decl_type == error_mark_node)
10463 /* Something already went wrong. There's no need to check
10465 return error_mark_node;
10467 /* [dcl.fct.default]
10469 A default argument expression is implicitly converted to the
10471 if (!TREE_TYPE (arg)
10472 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10475 error ("default argument for %q#D has type %qT",
10476 decl, TREE_TYPE (arg));
10478 error ("default argument for parameter of type %qT has type %qT",
10479 decl_type, TREE_TYPE (arg));
10481 return error_mark_node;
10484 /* [dcl.fct.default]
10486 Local variables shall not be used in default argument
10489 The keyword `this' shall not be used in a default argument of a
10490 member function. */
10491 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10494 error ("default argument %qE uses local variable %qD", arg, var);
10495 return error_mark_node;
10502 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10505 type_is_deprecated (tree type)
10507 enum tree_code code;
10508 if (TREE_DEPRECATED (type))
10510 if (TYPE_NAME (type)
10511 && TREE_DEPRECATED (TYPE_NAME (type)))
10514 /* Do warn about using typedefs to a deprecated class. */
10515 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10516 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10518 code = TREE_CODE (type);
10520 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10521 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10522 || code == METHOD_TYPE || code == ARRAY_TYPE)
10523 return type_is_deprecated (TREE_TYPE (type));
10525 if (TYPE_PTRMEMFUNC_P (type))
10526 return type_is_deprecated
10527 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10532 /* Decode the list of parameter types for a function type.
10533 Given the list of things declared inside the parens,
10534 return a list of types.
10536 If this parameter does not end with an ellipsis, we append
10539 *PARMS is set to the chain of PARM_DECLs created. */
10542 grokparms (tree parmlist, tree *parms)
10544 tree result = NULL_TREE;
10545 tree decls = NULL_TREE;
10549 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10551 tree type = NULL_TREE;
10552 tree init = TREE_PURPOSE (parm);
10553 tree decl = TREE_VALUE (parm);
10554 const char *errmsg;
10556 if (parm == void_list_node)
10559 if (! decl || TREE_TYPE (decl) == error_mark_node)
10562 type = TREE_TYPE (decl);
10563 if (VOID_TYPE_P (type))
10565 if (same_type_p (type, void_type_node)
10566 && DECL_SELF_REFERENCE_P (type)
10567 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10568 /* this is a parmlist of `(void)', which is ok. */
10570 cxx_incomplete_type_error (decl, type);
10571 /* It's not a good idea to actually create parameters of
10572 type `void'; other parts of the compiler assume that a
10573 void type terminates the parameter list. */
10574 type = error_mark_node;
10575 TREE_TYPE (decl) = error_mark_node;
10578 if (type != error_mark_node
10579 && TYPE_FOR_JAVA (type)
10580 && MAYBE_CLASS_TYPE_P (type))
10582 error ("parameter %qD has Java class type", decl);
10583 type = error_mark_node;
10584 TREE_TYPE (decl) = error_mark_node;
10588 if (type != error_mark_node
10589 && (errmsg = targetm.invalid_parameter_type (type)))
10592 type = error_mark_node;
10593 TREE_TYPE (decl) = error_mark_node;
10596 if (type != error_mark_node)
10598 if (deprecated_state != DEPRECATED_SUPPRESS)
10600 tree deptype = type_is_deprecated (type);
10602 warn_deprecated_use (deptype, NULL_TREE);
10605 /* Top-level qualifiers on the parameters are
10606 ignored for function types. */
10607 type = cp_build_qualified_type (type, 0);
10608 if (TREE_CODE (type) == METHOD_TYPE)
10610 error ("parameter %qD invalidly declared method type", decl);
10611 type = build_pointer_type (type);
10612 TREE_TYPE (decl) = type;
10614 else if (abstract_virtuals_error (decl, type))
10615 any_error = 1; /* Seems like a good idea. */
10616 else if (POINTER_TYPE_P (type))
10618 /* [dcl.fct]/6, parameter types cannot contain pointers
10619 (references) to arrays of unknown bound. */
10620 tree t = TREE_TYPE (type);
10621 int ptr = TYPE_PTR_P (type);
10625 if (TYPE_PTR_P (t))
10627 else if (TREE_CODE (t) != ARRAY_TYPE)
10629 else if (!TYPE_DOMAIN (t))
10633 if (TREE_CODE (t) == ARRAY_TYPE)
10635 ? G_("parameter %qD includes pointer to array of "
10636 "unknown bound %qT")
10637 : G_("parameter %qD includes reference to array of "
10638 "unknown bound %qT"),
10644 else if (init && !processing_template_decl)
10645 init = check_default_argument (decl, init);
10648 DECL_CHAIN (decl) = decls;
10650 result = tree_cons (init, type, result);
10652 decls = nreverse (decls);
10653 result = nreverse (result);
10655 result = chainon (result, void_list_node);
10662 /* D is a constructor or overloaded `operator='.
10664 Let T be the class in which D is declared. Then, this function
10667 -1 if D's is an ill-formed constructor or copy assignment operator
10668 whose first parameter is of type `T'.
10669 0 if D is not a copy constructor or copy assignment
10671 1 if D is a copy constructor or copy assignment operator whose
10672 first parameter is a reference to non-const qualified T.
10673 2 if D is a copy constructor or copy assignment operator whose
10674 first parameter is a reference to const qualified T.
10676 This function can be used as a predicate. Positive values indicate
10677 a copy constructor and nonzero values indicate a copy assignment
10681 copy_fn_p (const_tree d)
10687 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10689 if (TREE_CODE (d) == TEMPLATE_DECL
10690 || (DECL_TEMPLATE_INFO (d)
10691 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10692 /* Instantiations of template member functions are never copy
10693 functions. Note that member functions of templated classes are
10694 represented as template functions internally, and we must
10695 accept those as copy functions. */
10698 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10702 arg_type = TREE_VALUE (args);
10703 if (arg_type == error_mark_node)
10706 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10708 /* Pass by value copy assignment operator. */
10711 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10712 && !TYPE_REF_IS_RVALUE (arg_type)
10713 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10715 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10721 args = TREE_CHAIN (args);
10723 if (args && args != void_list_node && !TREE_PURPOSE (args))
10724 /* There are more non-optional args. */
10730 /* D is a constructor or overloaded `operator='.
10732 Let T be the class in which D is declared. Then, this function
10733 returns true when D is a move constructor or move assignment
10734 operator, false otherwise. */
10737 move_fn_p (const_tree d)
10741 bool result = false;
10743 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10745 if (cxx_dialect == cxx98)
10746 /* There are no move constructors if we are in C++98 mode. */
10749 if (TREE_CODE (d) == TEMPLATE_DECL
10750 || (DECL_TEMPLATE_INFO (d)
10751 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10752 /* Instantiations of template member functions are never copy
10753 functions. Note that member functions of templated classes are
10754 represented as template functions internally, and we must
10755 accept those as copy functions. */
10758 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10762 arg_type = TREE_VALUE (args);
10763 if (arg_type == error_mark_node)
10766 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10767 && TYPE_REF_IS_RVALUE (arg_type)
10768 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10772 args = TREE_CHAIN (args);
10774 if (args && args != void_list_node && !TREE_PURPOSE (args))
10775 /* There are more non-optional args. */
10781 /* Remember any special properties of member function DECL. */
10784 grok_special_member_properties (tree decl)
10788 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10791 class_type = DECL_CONTEXT (decl);
10792 if (DECL_CONSTRUCTOR_P (decl))
10794 int ctor = copy_fn_p (decl);
10796 if (!DECL_ARTIFICIAL (decl))
10797 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10803 A non-template constructor for class X is a copy
10804 constructor if its first parameter is of type X&, const
10805 X&, volatile X& or const volatile X&, and either there
10806 are no other parameters or else all other parameters have
10807 default arguments. */
10808 TYPE_HAS_COPY_CTOR (class_type) = 1;
10809 if (user_provided_p (decl))
10810 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10812 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10814 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10816 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10817 if (user_provided_p (decl))
10818 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10820 else if (move_fn_p (decl) && user_provided_p (decl))
10821 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10822 else if (is_list_ctor (decl))
10823 TYPE_HAS_LIST_CTOR (class_type) = 1;
10825 if (DECL_DECLARED_CONSTEXPR_P (decl)
10826 && !copy_fn_p (decl) && !move_fn_p (decl))
10827 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10829 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10833 A non-template assignment operator for class X is a copy
10834 assignment operator if its parameter is of type X, X&, const
10835 X&, volatile X& or const volatile X&. */
10837 int assop = copy_fn_p (decl);
10841 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10842 if (user_provided_p (decl))
10843 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10845 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10847 else if (move_fn_p (decl) && user_provided_p (decl))
10848 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10850 /* Destructors are handled in check_methods. */
10853 /* Check a constructor DECL has the correct form. Complains
10854 if the class has a constructor of the form X(X). */
10857 grok_ctor_properties (const_tree ctype, const_tree decl)
10859 int ctor_parm = copy_fn_p (decl);
10865 A declaration of a constructor for a class X is ill-formed if
10866 its first parameter is of type (optionally cv-qualified) X
10867 and either there are no other parameters or else all other
10868 parameters have default arguments.
10870 We *don't* complain about member template instantiations that
10871 have this form, though; they can occur as we try to decide
10872 what constructor to use during overload resolution. Since
10873 overload resolution will never prefer such a constructor to
10874 the non-template copy constructor (which is either explicitly
10875 or implicitly defined), there's no need to worry about their
10876 existence. Theoretically, they should never even be
10877 instantiated, but that's hard to forestall. */
10878 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10886 /* An operator with this code is unary, but can also be binary. */
10889 ambi_op_p (enum tree_code code)
10891 return (code == INDIRECT_REF
10892 || code == ADDR_EXPR
10893 || code == UNARY_PLUS_EXPR
10894 || code == NEGATE_EXPR
10895 || code == PREINCREMENT_EXPR
10896 || code == PREDECREMENT_EXPR);
10899 /* An operator with this name can only be unary. */
10902 unary_op_p (enum tree_code code)
10904 return (code == TRUTH_NOT_EXPR
10905 || code == BIT_NOT_EXPR
10906 || code == COMPONENT_REF
10907 || code == TYPE_EXPR);
10910 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10911 errors are issued for invalid declarations. */
10914 grok_op_properties (tree decl, bool complain)
10916 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10918 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10919 tree name = DECL_NAME (decl);
10920 enum tree_code operator_code;
10925 /* Count the number of arguments and check for ellipsis. */
10926 for (argtype = argtypes, arity = 0;
10927 argtype && argtype != void_list_node;
10928 argtype = TREE_CHAIN (argtype))
10930 ellipsis_p = !argtype;
10932 class_type = DECL_CONTEXT (decl);
10933 if (class_type && !CLASS_TYPE_P (class_type))
10934 class_type = NULL_TREE;
10936 if (DECL_CONV_FN_P (decl))
10937 operator_code = TYPE_EXPR;
10941 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10942 if (ansi_opname (CODE) == name) \
10944 operator_code = (CODE); \
10947 else if (ansi_assopname (CODE) == name) \
10949 operator_code = (CODE); \
10950 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10954 #include "operators.def"
10955 #undef DEF_OPERATOR
10957 gcc_unreachable ();
10960 gcc_assert (operator_code != MAX_TREE_CODES);
10961 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10964 switch (operator_code)
10967 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10971 TYPE_GETS_DELETE (class_type) |= 1;
10975 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10978 case VEC_DELETE_EXPR:
10979 TYPE_GETS_DELETE (class_type) |= 2;
10986 /* [basic.std.dynamic.allocation]/1:
10988 A program is ill-formed if an allocation function is declared
10989 in a namespace scope other than global scope or declared static
10992 The same also holds true for deallocation functions. */
10993 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10994 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10996 if (DECL_NAMESPACE_SCOPE_P (decl))
10998 if (CP_DECL_CONTEXT (decl) != global_namespace)
11000 error ("%qD may not be declared within a namespace", decl);
11003 else if (!TREE_PUBLIC (decl))
11005 error ("%qD may not be declared as static", decl);
11011 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11013 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11014 DECL_IS_OPERATOR_NEW (decl) = 1;
11016 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11017 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11020 /* An operator function must either be a non-static member function
11021 or have at least one parameter of a class, a reference to a class,
11022 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11023 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11025 if (operator_code == TYPE_EXPR
11026 || operator_code == CALL_EXPR
11027 || operator_code == COMPONENT_REF
11028 || operator_code == ARRAY_REF
11029 || operator_code == NOP_EXPR)
11031 error ("%qD must be a nonstatic member function", decl);
11038 if (DECL_STATIC_FUNCTION_P (decl))
11040 error ("%qD must be either a non-static member "
11041 "function or a non-member function", decl);
11045 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11047 tree arg = non_reference (TREE_VALUE (p));
11048 if (arg == error_mark_node)
11051 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11052 because these checks are performed even on
11053 template functions. */
11054 if (MAYBE_CLASS_TYPE_P (arg)
11055 || TREE_CODE (arg) == ENUMERAL_TYPE)
11059 if (!p || p == void_list_node)
11062 error ("%qD must have an argument of class or "
11063 "enumerated type", decl);
11069 /* There are no restrictions on the arguments to an overloaded
11071 if (operator_code == CALL_EXPR)
11074 /* Warn about conversion operators that will never be used. */
11075 if (IDENTIFIER_TYPENAME_P (name)
11076 && ! DECL_TEMPLATE_INFO (decl)
11078 /* Warn only declaring the function; there is no need to
11079 warn again about out-of-class definitions. */
11080 && class_type == current_class_type)
11082 tree t = TREE_TYPE (name);
11083 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11086 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11088 if (TREE_CODE (t) == VOID_TYPE)
11089 warning (OPT_Wconversion,
11091 ? G_("conversion to a reference to void "
11092 "will never use a type conversion operator")
11093 : G_("conversion to void "
11094 "will never use a type conversion operator"));
11095 else if (class_type)
11097 if (t == class_type)
11098 warning (OPT_Wconversion,
11100 ? G_("conversion to a reference to the same type "
11101 "will never use a type conversion operator")
11102 : G_("conversion to the same type "
11103 "will never use a type conversion operator"));
11104 /* Don't force t to be complete here. */
11105 else if (MAYBE_CLASS_TYPE_P (t)
11106 && COMPLETE_TYPE_P (t)
11107 && DERIVED_FROM_P (t, class_type))
11108 warning (OPT_Wconversion,
11110 ? G_("conversion to a reference to a base class "
11111 "will never use a type conversion operator")
11112 : G_("conversion to a base class "
11113 "will never use a type conversion operator"));
11118 if (operator_code == COND_EXPR)
11121 error ("ISO C++ prohibits overloading operator ?:");
11124 else if (ellipsis_p)
11126 error ("%qD must not have variable number of arguments", decl);
11129 else if (ambi_op_p (operator_code))
11132 /* We pick the one-argument operator codes by default, so
11133 we don't have to change anything. */
11135 else if (arity == 2)
11137 /* If we thought this was a unary operator, we now know
11138 it to be a binary operator. */
11139 switch (operator_code)
11142 operator_code = MULT_EXPR;
11146 operator_code = BIT_AND_EXPR;
11149 case UNARY_PLUS_EXPR:
11150 operator_code = PLUS_EXPR;
11154 operator_code = MINUS_EXPR;
11157 case PREINCREMENT_EXPR:
11158 operator_code = POSTINCREMENT_EXPR;
11161 case PREDECREMENT_EXPR:
11162 operator_code = POSTDECREMENT_EXPR;
11166 gcc_unreachable ();
11169 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11171 if ((operator_code == POSTINCREMENT_EXPR
11172 || operator_code == POSTDECREMENT_EXPR)
11173 && ! processing_template_decl
11174 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11177 error ("postfix %qD must take %<int%> as its argument",
11180 error ("postfix %qD must take %<int%> as its second "
11188 error ("%qD must take either zero or one argument", decl);
11190 error ("%qD must take either one or two arguments", decl);
11194 /* More Effective C++ rule 6. */
11196 && (operator_code == POSTINCREMENT_EXPR
11197 || operator_code == POSTDECREMENT_EXPR
11198 || operator_code == PREINCREMENT_EXPR
11199 || operator_code == PREDECREMENT_EXPR))
11201 tree arg = TREE_VALUE (argtypes);
11202 tree ret = TREE_TYPE (TREE_TYPE (decl));
11203 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11204 arg = TREE_TYPE (arg);
11205 arg = TYPE_MAIN_VARIANT (arg);
11206 if (operator_code == PREINCREMENT_EXPR
11207 || operator_code == PREDECREMENT_EXPR)
11209 if (TREE_CODE (ret) != REFERENCE_TYPE
11210 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11212 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11213 build_reference_type (arg));
11217 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11218 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11222 else if (unary_op_p (operator_code))
11227 error ("%qD must take %<void%>", decl);
11229 error ("%qD must take exactly one argument", decl);
11233 else /* if (binary_op_p (operator_code)) */
11238 error ("%qD must take exactly one argument", decl);
11240 error ("%qD must take exactly two arguments", decl);
11244 /* More Effective C++ rule 7. */
11246 && (operator_code == TRUTH_ANDIF_EXPR
11247 || operator_code == TRUTH_ORIF_EXPR
11248 || operator_code == COMPOUND_EXPR))
11249 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11253 /* Effective C++ rule 23. */
11256 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11257 && (operator_code == PLUS_EXPR
11258 || operator_code == MINUS_EXPR
11259 || operator_code == TRUNC_DIV_EXPR
11260 || operator_code == MULT_EXPR
11261 || operator_code == TRUNC_MOD_EXPR)
11262 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11263 warning (OPT_Weffc__, "%qD should return by value", decl);
11265 /* [over.oper]/8 */
11266 for (; argtypes && argtypes != void_list_node;
11267 argtypes = TREE_CHAIN (argtypes))
11268 if (TREE_PURPOSE (argtypes))
11270 TREE_PURPOSE (argtypes) = NULL_TREE;
11271 if (operator_code == POSTINCREMENT_EXPR
11272 || operator_code == POSTDECREMENT_EXPR)
11274 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11279 error ("%qD cannot have default arguments", decl);
11287 /* Return a string giving the keyword associate with CODE. */
11289 static const char *
11290 tag_name (enum tag_types code)
11302 case typename_type:
11305 gcc_unreachable ();
11309 /* Name lookup in an elaborated-type-specifier (after the keyword
11310 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11311 elaborated-type-specifier is invalid, issue a diagnostic and return
11312 error_mark_node; otherwise, return the *_TYPE to which it referred.
11313 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11316 check_elaborated_type_specifier (enum tag_types tag_code,
11318 bool allow_template_p)
11324 struct S { struct S *p; };
11326 name lookup will find the TYPE_DECL for the implicit "S::S"
11327 typedef. Adjust for that here. */
11328 if (DECL_SELF_REFERENCE_P (decl))
11329 decl = TYPE_NAME (TREE_TYPE (decl));
11331 type = TREE_TYPE (decl);
11333 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11334 is false for this case as well. */
11335 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11337 error ("using template type parameter %qT after %qs",
11338 type, tag_name (tag_code));
11339 return error_mark_node;
11343 If the identifier resolves to a typedef-name or a template
11344 type-parameter, the elaborated-type-specifier is ill-formed.
11346 In other words, the only legitimate declaration to use in the
11347 elaborated type specifier is the implicit typedef created when
11348 the type is declared. */
11349 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11350 && !DECL_SELF_REFERENCE_P (decl)
11351 && tag_code != typename_type)
11353 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11354 error ("%q+D has a previous declaration here", decl);
11355 return error_mark_node;
11357 else if (TREE_CODE (type) != RECORD_TYPE
11358 && TREE_CODE (type) != UNION_TYPE
11359 && tag_code != enum_type
11360 && tag_code != typename_type)
11362 error ("%qT referred to as %qs", type, tag_name (tag_code));
11363 error ("%q+T has a previous declaration here", type);
11364 return error_mark_node;
11366 else if (TREE_CODE (type) != ENUMERAL_TYPE
11367 && tag_code == enum_type)
11369 error ("%qT referred to as enum", type);
11370 error ("%q+T has a previous declaration here", type);
11371 return error_mark_node;
11373 else if (!allow_template_p
11374 && TREE_CODE (type) == RECORD_TYPE
11375 && CLASSTYPE_IS_TEMPLATE (type))
11377 /* If a class template appears as elaborated type specifier
11378 without a template header such as:
11380 template <class T> class C {};
11381 void f(class C); // No template header here
11383 then the required template argument is missing. */
11384 error ("template argument required for %<%s %T%>",
11385 tag_name (tag_code),
11386 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11387 return error_mark_node;
11393 /* Lookup NAME in elaborate type specifier in scope according to
11394 SCOPE and issue diagnostics if necessary.
11395 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11396 found, and ERROR_MARK_NODE for type error. */
11399 lookup_and_check_tag (enum tag_types tag_code, tree name,
11400 tag_scope scope, bool template_header_p)
11404 if (scope == ts_global)
11406 /* First try ordinary name lookup, ignoring hidden class name
11407 injected via friend declaration. */
11408 decl = lookup_name_prefer_type (name, 2);
11409 /* If that fails, the name will be placed in the smallest
11410 non-class, non-function-prototype scope according to 3.3.1/5.
11411 We may already have a hidden name declared as friend in this
11412 scope. So lookup again but not ignoring hidden names.
11413 If we find one, that name will be made visible rather than
11414 creating a new tag. */
11416 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11419 decl = lookup_type_scope (name, scope);
11421 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11422 decl = DECL_TEMPLATE_RESULT (decl);
11424 if (decl && TREE_CODE (decl) == TYPE_DECL)
11426 /* Look for invalid nested type:
11430 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11432 error ("%qD has the same name as the class in which it is "
11435 return error_mark_node;
11438 /* Two cases we need to consider when deciding if a class
11439 template is allowed as an elaborated type specifier:
11440 1. It is a self reference to its own class.
11441 2. It comes with a template header.
11445 template <class T> class C {
11446 class C *c1; // DECL_SELF_REFERENCE_P is true
11449 template <class U> class C; // template_header_p is true
11450 template <class T> class C<T>::D {
11451 class C *c2; // DECL_SELF_REFERENCE_P is true
11454 t = check_elaborated_type_specifier (tag_code,
11457 | DECL_SELF_REFERENCE_P (decl));
11460 else if (decl && TREE_CODE (decl) == TREE_LIST)
11462 error ("reference to %qD is ambiguous", name);
11463 print_candidates (decl);
11464 return error_mark_node;
11470 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11471 Define the tag as a forward-reference if it is not defined.
11473 If a declaration is given, process it here, and report an error if
11474 multiple declarations are not identical.
11476 SCOPE is TS_CURRENT when this is also a definition. Only look in
11477 the current frame for the name (since C++ allows new names in any
11478 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11479 declaration. Only look beginning from the current scope outward up
11480 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11482 TEMPLATE_HEADER_P is true when this declaration is preceded by
11483 a set of template parameters. */
11486 xref_tag_1 (enum tag_types tag_code, tree name,
11487 tag_scope scope, bool template_header_p)
11489 enum tree_code code;
11491 tree context = NULL_TREE;
11493 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11499 code = RECORD_TYPE;
11505 code = ENUMERAL_TYPE;
11508 gcc_unreachable ();
11511 /* In case of anonymous name, xref_tag is only called to
11512 make type node and push name. Name lookup is not required. */
11513 if (ANON_AGGRNAME_P (name))
11516 t = lookup_and_check_tag (tag_code, name,
11517 scope, template_header_p);
11519 if (t == error_mark_node)
11520 return error_mark_node;
11522 if (scope != ts_current && t && current_class_type
11523 && template_class_depth (current_class_type)
11524 && template_header_p)
11526 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11527 definition of this tag. Since, in addition, we are currently
11528 processing a (member) template declaration of a template
11529 class, we must be very careful; consider:
11536 { template <class V>
11537 friend struct S1; };
11539 Here, the S2::S1 declaration should not be confused with the
11540 outer declaration. In particular, the inner version should
11541 have a template parameter of level 2, not level 1. This
11542 would be particularly important if the member declaration
11545 template <class V = U> friend struct S1;
11547 say, when we should tsubst into `U' when instantiating
11548 S2. On the other hand, when presented with:
11558 we must find the inner binding eventually. We
11559 accomplish this by making sure that the new type we
11560 create to represent this declaration has the right
11562 context = TYPE_CONTEXT (t);
11568 /* If no such tag is yet defined, create a forward-reference node
11569 and record it as the "definition".
11570 When a real declaration of this type is found,
11571 the forward-reference will be altered into a real type. */
11572 if (code == ENUMERAL_TYPE)
11574 error ("use of enum %q#D without previous declaration", name);
11575 return error_mark_node;
11579 t = make_class_type (code);
11580 TYPE_CONTEXT (t) = context;
11581 t = pushtag (name, t, scope);
11586 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11588 if (!redeclare_class_template (t, current_template_parms))
11589 return error_mark_node;
11591 else if (!processing_template_decl
11592 && CLASS_TYPE_P (t)
11593 && CLASSTYPE_IS_TEMPLATE (t))
11595 error ("redeclaration of %qT as a non-template", t);
11596 error ("previous declaration %q+D", t);
11597 return error_mark_node;
11600 /* Make injected friend class visible. */
11601 if (scope != ts_within_enclosing_non_class
11602 && hidden_name_p (TYPE_NAME (t)))
11604 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11605 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11607 if (TYPE_TEMPLATE_INFO (t))
11609 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11610 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11618 /* Wrapper for xref_tag_1. */
11621 xref_tag (enum tag_types tag_code, tree name,
11622 tag_scope scope, bool template_header_p)
11626 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11627 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11628 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11634 xref_tag_from_type (tree old, tree id, tag_scope scope)
11636 enum tag_types tag_kind;
11638 if (TREE_CODE (old) == RECORD_TYPE)
11639 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11641 tag_kind = union_type;
11643 if (id == NULL_TREE)
11644 id = TYPE_IDENTIFIER (old);
11646 return xref_tag (tag_kind, id, scope, false);
11649 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11650 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11651 access_* node, and the TREE_VALUE is the type of the base-class.
11652 Non-NULL TREE_TYPE indicates virtual inheritance.
11654 Returns true if the binfo hierarchy was successfully created,
11655 false if an error was detected. */
11658 xref_basetypes (tree ref, tree base_list)
11661 tree binfo, base_binfo;
11662 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11663 unsigned max_bases = 0; /* Maximum direct bases. */
11665 tree default_access;
11666 tree igo_prev; /* Track Inheritance Graph Order. */
11668 if (ref == error_mark_node)
11671 /* The base of a derived class is private by default, all others are
11673 default_access = (TREE_CODE (ref) == RECORD_TYPE
11674 && CLASSTYPE_DECLARED_CLASS (ref)
11675 ? access_private_node : access_public_node);
11677 /* First, make sure that any templates in base-classes are
11678 instantiated. This ensures that if we call ourselves recursively
11679 we do not get confused about which classes are marked and which
11681 basep = &base_list;
11684 tree basetype = TREE_VALUE (*basep);
11686 if (!(processing_template_decl && uses_template_parms (basetype))
11687 && !complete_type_or_else (basetype, NULL))
11688 /* An incomplete type. Remove it from the list. */
11689 *basep = TREE_CHAIN (*basep);
11693 if (TREE_TYPE (*basep))
11695 if (CLASS_TYPE_P (basetype))
11696 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11697 basep = &TREE_CHAIN (*basep);
11701 TYPE_MARKED_P (ref) = 1;
11703 /* The binfo slot should be empty, unless this is an (ill-formed)
11705 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11707 error ("redefinition of %q#T", ref);
11711 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11713 binfo = make_tree_binfo (max_bases);
11715 TYPE_BINFO (ref) = binfo;
11716 BINFO_OFFSET (binfo) = size_zero_node;
11717 BINFO_TYPE (binfo) = ref;
11719 /* Apply base-class info set up to the variants of this type. */
11720 fixup_type_variants (ref);
11724 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11725 /* An aggregate cannot have baseclasses. */
11726 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11728 if (TREE_CODE (ref) == UNION_TYPE)
11730 error ("derived union %qT invalid", ref);
11737 if (TYPE_FOR_JAVA (ref))
11739 error ("Java class %qT cannot have multiple bases", ref);
11746 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11748 if (TYPE_FOR_JAVA (ref))
11750 error ("Java class %qT cannot have virtual bases", ref);
11755 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11757 tree access = TREE_PURPOSE (base_list);
11758 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11759 tree basetype = TREE_VALUE (base_list);
11761 if (access == access_default_node)
11762 access = default_access;
11764 if (PACK_EXPANSION_P (basetype))
11765 basetype = PACK_EXPANSION_PATTERN (basetype);
11766 if (TREE_CODE (basetype) == TYPE_DECL)
11767 basetype = TREE_TYPE (basetype);
11768 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11770 error ("base type %qT fails to be a struct or class type",
11775 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11776 TYPE_FOR_JAVA (ref) = 1;
11778 base_binfo = NULL_TREE;
11779 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11781 base_binfo = TYPE_BINFO (basetype);
11782 /* The original basetype could have been a typedef'd type. */
11783 basetype = BINFO_TYPE (base_binfo);
11785 /* Inherit flags from the base. */
11786 TYPE_HAS_NEW_OPERATOR (ref)
11787 |= TYPE_HAS_NEW_OPERATOR (basetype);
11788 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11789 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11790 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11791 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11792 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11793 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11794 CLASSTYPE_REPEATED_BASE_P (ref)
11795 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11798 /* We must do this test after we've seen through a typedef
11800 if (TYPE_MARKED_P (basetype))
11802 if (basetype == ref)
11803 error ("recursive type %qT undefined", basetype);
11805 error ("duplicate base type %qT invalid", basetype);
11809 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11810 /* Regenerate the pack expansion for the bases. */
11811 basetype = make_pack_expansion (basetype);
11813 TYPE_MARKED_P (basetype) = 1;
11815 base_binfo = copy_binfo (base_binfo, basetype, ref,
11816 &igo_prev, via_virtual);
11817 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11818 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11820 BINFO_BASE_APPEND (binfo, base_binfo);
11821 BINFO_BASE_ACCESS_APPEND (binfo, access);
11824 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11825 /* If we have space in the vbase vector, we must have shared at
11826 least one of them, and are therefore diamond shaped. */
11827 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11829 /* Unmark all the types. */
11830 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11831 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11832 TYPE_MARKED_P (ref) = 0;
11834 /* Now see if we have a repeated base type. */
11835 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11837 for (base_binfo = binfo; base_binfo;
11838 base_binfo = TREE_CHAIN (base_binfo))
11840 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11842 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11845 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11847 for (base_binfo = binfo; base_binfo;
11848 base_binfo = TREE_CHAIN (base_binfo))
11849 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11850 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11859 /* Copies the enum-related properties from type SRC to type DST.
11860 Used with the underlying type of an enum and the enum itself. */
11862 copy_type_enum (tree dst, tree src)
11864 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11865 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11866 TYPE_SIZE (dst) = TYPE_SIZE (src);
11867 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11868 SET_TYPE_MODE (dst, TYPE_MODE (src));
11869 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11870 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11871 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11872 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11875 /* Begin compiling the definition of an enumeration type.
11878 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11880 UNDERLYING_TYPE is the type that will be used as the storage for
11881 the enumeration type. This should be NULL_TREE if no storage type
11884 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11886 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11888 Returns the type object, as yet incomplete.
11889 Also records info about it so that build_enumerator
11890 may be used to declare the individual values as they are read. */
11893 start_enum (tree name, tree enumtype, tree underlying_type,
11894 bool scoped_enum_p, bool *is_new)
11896 tree prevtype = NULL_TREE;
11897 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11901 /* [C++0x dcl.enum]p5:
11903 If not explicitly specified, the underlying type of a scoped
11904 enumeration type is int. */
11905 if (!underlying_type && scoped_enum_p)
11906 underlying_type = integer_type_node;
11908 if (underlying_type)
11909 underlying_type = cv_unqualified (underlying_type);
11911 /* If this is the real definition for a previous forward reference,
11912 fill in the contents in the same object that used to be the
11913 forward reference. */
11915 enumtype = lookup_and_check_tag (enum_type, name,
11916 /*tag_scope=*/ts_current,
11917 /*template_header_p=*/false);
11919 /* In case of a template_decl, the only check that should be deferred
11920 to instantiation time is the comparison of underlying types. */
11921 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11923 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11925 error_at (input_location, "scoped/unscoped mismatch "
11926 "in enum %q#T", enumtype);
11927 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11928 "previous definition here");
11929 enumtype = error_mark_node;
11931 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11933 error_at (input_location, "underlying type mismatch "
11934 "in enum %q#T", enumtype);
11935 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11936 "previous definition here");
11937 enumtype = error_mark_node;
11939 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11940 && !dependent_type_p (underlying_type)
11941 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11942 && !same_type_p (underlying_type,
11943 ENUM_UNDERLYING_TYPE (enumtype)))
11945 error_at (input_location, "different underlying type "
11946 "in enum %q#T", enumtype);
11947 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11948 "previous definition here");
11949 underlying_type = NULL_TREE;
11953 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11954 || processing_template_decl)
11956 /* In case of error, make a dummy enum to allow parsing to
11958 if (enumtype == error_mark_node)
11960 name = make_anon_name ();
11961 enumtype = NULL_TREE;
11964 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11965 of an opaque enum, or an opaque enum of an already defined
11966 enumeration (C++0x only).
11967 In any other case, it'll be NULL_TREE. */
11973 prevtype = enumtype;
11974 enumtype = cxx_make_type (ENUMERAL_TYPE);
11975 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11976 if (enumtype == error_mark_node)
11977 return error_mark_node;
11979 /* The enum is considered opaque until the opening '{' of the
11980 enumerator list. */
11981 SET_OPAQUE_ENUM_P (enumtype, true);
11982 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11985 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11987 if (underlying_type)
11989 if (CP_INTEGRAL_TYPE_P (underlying_type))
11991 copy_type_enum (enumtype, underlying_type);
11992 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11994 else if (dependent_type_p (underlying_type))
11995 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11997 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11998 underlying_type, enumtype);
12001 /* If into a template class, the returned enum is always the first
12002 declaration (opaque or not) seen. This way all the references to
12003 this type will be to the same declaration. The following ones are used
12004 only to check for definition errors. */
12005 if (prevtype && processing_template_decl)
12011 /* After processing and defining all the values of an enumeration type,
12012 install their decls in the enumeration type.
12013 ENUMTYPE is the type object. */
12016 finish_enum_value_list (tree enumtype)
12019 tree underlying_type;
12022 tree minnode, maxnode;
12025 bool fixed_underlying_type_p
12026 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12028 /* We built up the VALUES in reverse order. */
12029 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12031 /* For an enum defined in a template, just set the type of the values;
12032 all further processing is postponed until the template is
12033 instantiated. We need to set the type so that tsubst of a CONST_DECL
12035 if (processing_template_decl)
12037 for (values = TYPE_VALUES (enumtype);
12039 values = TREE_CHAIN (values))
12040 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12044 /* Determine the minimum and maximum values of the enumerators. */
12045 if (TYPE_VALUES (enumtype))
12047 minnode = maxnode = NULL_TREE;
12049 for (values = TYPE_VALUES (enumtype);
12051 values = TREE_CHAIN (values))
12053 decl = TREE_VALUE (values);
12055 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12056 each enumerator has the type of its enumeration. Prior to the
12057 closing brace, the type of each enumerator is the type of its
12058 initializing value. */
12059 TREE_TYPE (decl) = enumtype;
12061 /* Update the minimum and maximum values, if appropriate. */
12062 value = DECL_INITIAL (decl);
12063 if (value == error_mark_node)
12064 value = integer_zero_node;
12065 /* Figure out what the minimum and maximum values of the
12066 enumerators are. */
12068 minnode = maxnode = value;
12069 else if (tree_int_cst_lt (maxnode, value))
12071 else if (tree_int_cst_lt (value, minnode))
12078 If the enumerator-list is empty, the underlying type is as if
12079 the enumeration had a single enumerator with value 0. */
12080 minnode = maxnode = integer_zero_node;
12082 if (!fixed_underlying_type_p)
12084 /* Compute the number of bits require to represent all values of the
12085 enumeration. We must do this before the type of MINNODE and
12086 MAXNODE are transformed, since tree_int_cst_min_precision relies
12087 on the TREE_TYPE of the value it is passed. */
12088 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12089 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12090 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12091 int precision = MAX (lowprec, highprec);
12093 bool use_short_enum;
12095 /* Determine the underlying type of the enumeration.
12099 The underlying type of an enumeration is an integral type that
12100 can represent all the enumerator values defined in the
12101 enumeration. It is implementation-defined which integral type is
12102 used as the underlying type for an enumeration except that the
12103 underlying type shall not be larger than int unless the value of
12104 an enumerator cannot fit in an int or unsigned int.
12106 We use "int" or an "unsigned int" as the underlying type, even if
12107 a smaller integral type would work, unless the user has
12108 explicitly requested that we use the smallest possible type. The
12109 user can request that for all enumerations with a command line
12110 flag, or for just one enumeration with an attribute. */
12112 use_short_enum = flag_short_enums
12113 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12115 for (itk = (use_short_enum ? itk_char : itk_int);
12119 underlying_type = integer_types[itk];
12120 if (underlying_type != NULL_TREE
12121 && TYPE_PRECISION (underlying_type) >= precision
12122 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12125 if (itk == itk_none)
12129 IF no integral type can represent all the enumerator values, the
12130 enumeration is ill-formed. */
12131 error ("no integral type can represent all of the enumerator values "
12132 "for %qT", enumtype);
12133 precision = TYPE_PRECISION (long_long_integer_type_node);
12134 underlying_type = integer_types[itk_unsigned_long_long];
12139 The value of sizeof() applied to an enumeration type, an object
12140 of an enumeration type, or an enumerator, is the value of sizeof()
12141 applied to the underlying type. */
12142 copy_type_enum (enumtype, underlying_type);
12144 /* Compute the minimum and maximum values for the type.
12148 For an enumeration where emin is the smallest enumerator and emax
12149 is the largest, the values of the enumeration are the values of the
12150 underlying type in the range bmin to bmax, where bmin and bmax are,
12151 respectively, the smallest and largest values of the smallest bit-
12152 field that can store emin and emax. */
12154 /* The middle-end currently assumes that types with TYPE_PRECISION
12155 narrower than their underlying type are suitably zero or sign
12156 extended to fill their mode. Similarly, it assumes that the front
12157 end assures that a value of a particular type must be within
12158 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12160 We used to set these fields based on bmin and bmax, but that led
12161 to invalid assumptions like optimizing away bounds checking. So
12162 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12163 TYPE_MAX_VALUE to the values for the mode above and only restrict
12164 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12165 ENUM_UNDERLYING_TYPE (enumtype)
12166 = build_distinct_type_copy (underlying_type);
12167 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12168 set_min_and_max_values_for_integral_type
12169 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12171 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12172 if (flag_strict_enums)
12173 set_min_and_max_values_for_integral_type (enumtype, precision,
12177 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12179 /* Convert each of the enumerators to the type of the underlying
12180 type of the enumeration. */
12181 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12183 location_t saved_location;
12185 decl = TREE_VALUE (values);
12186 saved_location = input_location;
12187 input_location = DECL_SOURCE_LOCATION (decl);
12188 if (fixed_underlying_type_p)
12189 /* If the enumeration type has a fixed underlying type, we
12190 already checked all of the enumerator values. */
12191 value = DECL_INITIAL (decl);
12193 value = perform_implicit_conversion (underlying_type,
12194 DECL_INITIAL (decl),
12195 tf_warning_or_error);
12196 input_location = saved_location;
12198 /* Do not clobber shared ints. */
12199 value = copy_node (value);
12201 TREE_TYPE (value) = enumtype;
12202 DECL_INITIAL (decl) = value;
12205 /* Fix up all variant types of this enum type. */
12206 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12207 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12209 /* Finish debugging output for this type. */
12210 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12213 /* Finishes the enum type. This is called only the first time an
12214 enumeration is seen, be it opaque or odinary.
12215 ENUMTYPE is the type object. */
12218 finish_enum (tree enumtype)
12220 if (processing_template_decl)
12222 if (at_function_scope_p ())
12223 add_stmt (build_min (TAG_DEFN, enumtype));
12227 /* Here there should not be any variants of this type. */
12228 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12229 && !TYPE_NEXT_VARIANT (enumtype));
12232 /* Build and install a CONST_DECL for an enumeration constant of the
12233 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12234 LOC is the location of NAME.
12235 Assignment of sequential values by default is handled here. */
12238 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12244 /* If the VALUE was erroneous, pretend it wasn't there; that will
12245 result in the enum being assigned the next value in sequence. */
12246 if (value == error_mark_node)
12249 /* Remove no-op casts from the value. */
12251 STRIP_TYPE_NOPS (value);
12253 if (! processing_template_decl)
12255 /* Validate and default VALUE. */
12256 if (value != NULL_TREE)
12258 value = cxx_constant_value (value);
12260 if (TREE_CODE (value) == INTEGER_CST
12261 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12263 value = perform_integral_promotions (value);
12267 error ("enumerator value for %qD is not an integer constant", name);
12272 /* Default based on previous value. */
12273 if (value == NULL_TREE)
12275 if (TYPE_VALUES (enumtype))
12278 unsigned HOST_WIDE_INT lo;
12282 /* C++03 7.2/4: If no initializer is specified for the first
12283 enumerator, the type is an unspecified integral
12284 type. Otherwise the type is the same as the type of the
12285 initializing value of the preceding enumerator unless the
12286 incremented value is not representable in that type, in
12287 which case the type is an unspecified integral type
12288 sufficient to contain the incremented value. */
12289 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12290 if (error_operand_p (prev_value))
12291 value = error_mark_node;
12294 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12295 TREE_INT_CST_HIGH (prev_value),
12300 tree type = TREE_TYPE (prev_value);
12301 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12302 di.low = lo; di.high = hi;
12303 if (!double_int_fits_to_tree_p (type, di))
12306 for (itk = itk_int; itk != itk_none; itk++)
12308 type = integer_types[itk];
12309 if (type != NULL_TREE
12310 && (pos || !TYPE_UNSIGNED (type))
12311 && double_int_fits_to_tree_p (type, di))
12314 if (type && cxx_dialect < cxx0x
12315 && itk > itk_unsigned_long)
12316 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12317 incremented enumerator value is too large for %<unsigned long%>" : "\
12318 incremented enumerator value is too large for %<long%>");
12320 if (type == NULL_TREE)
12323 value = double_int_to_tree (type, di);
12328 error ("overflow in enumeration values at %qD", name);
12329 value = error_mark_node;
12334 value = integer_zero_node;
12337 /* Remove no-op casts from the value. */
12338 STRIP_TYPE_NOPS (value);
12340 /* If the underlying type of the enum is fixed, check whether
12341 the enumerator values fits in the underlying type. If it
12342 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12343 if (ENUM_UNDERLYING_TYPE (enumtype)
12345 && TREE_CODE (value) == INTEGER_CST
12346 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12348 error ("enumerator value %E is too large for underlying type %<%T%>",
12349 value, ENUM_UNDERLYING_TYPE (enumtype));
12351 /* Silently convert the value so that we can continue. */
12352 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12357 /* C++ associates enums with global, function, or class declarations. */
12358 context = current_scope ();
12360 /* Build the actual enumeration constant. Note that the enumeration
12361 constants have the underlying type of the enum (if it is fixed)
12362 or the type of their initializer (if the underlying type of the
12363 enum is not fixed):
12367 If the underlying type is fixed, the type of each enumerator
12368 prior to the closing brace is the underlying type; if the
12369 initializing value of an enumerator cannot be represented by
12370 the underlying type, the program is ill-formed. If the
12371 underlying type is not fixed, the type of each enumerator is
12372 the type of its initializing value.
12374 If the underlying type is not fixed, it will be computed by
12375 finish_enum and we will reset the type of this enumerator. Of
12376 course, if we're processing a template, there may be no value. */
12377 type = value ? TREE_TYPE (value) : NULL_TREE;
12379 if (context && context == current_class_type)
12380 /* This enum declaration is local to the class. We need the full
12381 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12382 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12384 /* It's a global enum, or it's local to a function. (Note local to
12385 a function could mean local to a class method. */
12386 decl = build_decl (loc, CONST_DECL, name, type);
12388 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12389 TREE_CONSTANT (decl) = 1;
12390 TREE_READONLY (decl) = 1;
12391 DECL_INITIAL (decl) = value;
12393 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12394 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12395 on the TYPE_FIELDS list for `S'. (That's so that you can say
12396 things like `S::i' later.) */
12397 finish_member_declaration (decl);
12401 /* Add this enumeration constant to the list for this type. */
12402 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12405 /* Look for an enumerator with the given NAME within the enumeration
12406 type ENUMTYPE. This routine is used primarily for qualified name
12407 lookup into an enumerator in C++0x, e.g.,
12409 enum class Color { Red, Green, Blue };
12411 Color color = Color::Red;
12413 Returns the value corresponding to the enumerator, or
12414 NULL_TREE if no such enumerator was found. */
12416 lookup_enumerator (tree enumtype, tree name)
12419 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12421 e = purpose_member (name, TYPE_VALUES (enumtype));
12422 return e? TREE_VALUE (e) : NULL_TREE;
12426 /* We're defining DECL. Make sure that its type is OK. */
12429 check_function_type (tree decl, tree current_function_parms)
12431 tree fntype = TREE_TYPE (decl);
12432 tree return_type = complete_type (TREE_TYPE (fntype));
12434 /* In a function definition, arg types must be complete. */
12435 require_complete_types_for_parms (current_function_parms);
12437 if (dependent_type_p (return_type))
12439 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12440 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12442 tree args = TYPE_ARG_TYPES (fntype);
12444 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12445 error ("return type %q#T is incomplete", return_type);
12447 error ("return type has Java class type %q#T", return_type);
12449 /* Make it return void instead. */
12450 if (TREE_CODE (fntype) == METHOD_TYPE)
12451 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12453 TREE_CHAIN (args));
12455 fntype = build_function_type (void_type_node, args);
12457 = build_exception_variant (fntype,
12458 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12459 fntype = (cp_build_type_attribute_variant
12460 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12461 TREE_TYPE (decl) = fntype;
12464 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12467 /* Create the FUNCTION_DECL for a function definition.
12468 DECLSPECS and DECLARATOR are the parts of the declaration;
12469 they describe the function's name and the type it returns,
12470 but twisted together in a fashion that parallels the syntax of C.
12472 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12473 DECLARATOR is really the DECL for the function we are about to
12474 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12475 indicating that the function is an inline defined in-class.
12477 This function creates a binding context for the function body
12478 as well as setting up the FUNCTION_DECL in current_function_decl.
12480 For C++, we must first check whether that datum makes any sense.
12481 For example, "class A local_a(1,2);" means that variable local_a
12482 is an aggregate of type A, which should have a constructor
12483 applied to it with the argument list [1, 2].
12485 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12486 or may be a BLOCK if the function has been defined previously
12487 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12488 error_mark_node if the function has never been defined, or
12489 a BLOCK if the function has been defined somewhere. */
12492 start_preparsed_function (tree decl1, tree attrs, int flags)
12494 tree ctype = NULL_TREE;
12497 int doing_friend = 0;
12498 cp_binding_level *bl;
12499 tree current_function_parms;
12500 struct c_fileinfo *finfo
12501 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12502 bool honor_interface;
12504 /* Sanity check. */
12505 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12506 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12508 fntype = TREE_TYPE (decl1);
12509 if (TREE_CODE (fntype) == METHOD_TYPE)
12510 ctype = TYPE_METHOD_BASETYPE (fntype);
12512 /* ISO C++ 11.4/5. A friend function defined in a class is in
12513 the (lexical) scope of the class in which it is defined. */
12514 if (!ctype && DECL_FRIEND_P (decl1))
12516 ctype = DECL_FRIEND_CONTEXT (decl1);
12518 /* CTYPE could be null here if we're dealing with a template;
12519 for example, `inline friend float foo()' inside a template
12520 will have no CTYPE set. */
12521 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12527 if (DECL_DECLARED_INLINE_P (decl1)
12528 && lookup_attribute ("noinline", attrs))
12529 warning (0, "inline function %q+D given attribute noinline", decl1);
12531 /* Handle gnu_inline attribute. */
12532 if (GNU_INLINE_P (decl1))
12534 DECL_EXTERNAL (decl1) = 1;
12535 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12536 DECL_INTERFACE_KNOWN (decl1) = 1;
12537 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12540 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12541 /* This is a constructor, we must ensure that any default args
12542 introduced by this definition are propagated to the clones
12543 now. The clones are used directly in overload resolution. */
12544 adjust_clone_args (decl1);
12546 /* Sometimes we don't notice that a function is a static member, and
12547 build a METHOD_TYPE for it. Fix that up now. */
12548 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12549 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12551 /* Set up current_class_type, and enter the scope of the class, if
12554 push_nested_class (ctype);
12555 else if (DECL_STATIC_FUNCTION_P (decl1))
12556 push_nested_class (DECL_CONTEXT (decl1));
12558 /* Now that we have entered the scope of the class, we must restore
12559 the bindings for any template parameters surrounding DECL1, if it
12560 is an inline member template. (Order is important; consider the
12561 case where a template parameter has the same name as a field of
12562 the class.) It is not until after this point that
12563 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12564 if (flags & SF_INCLASS_INLINE)
12565 maybe_begin_member_template_processing (decl1);
12567 /* Effective C++ rule 15. */
12569 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12570 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12571 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12573 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12574 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12575 if (!DECL_INITIAL (decl1))
12576 DECL_INITIAL (decl1) = error_mark_node;
12578 /* This function exists in static storage.
12579 (This does not mean `static' in the C sense!) */
12580 TREE_STATIC (decl1) = 1;
12582 /* We must call push_template_decl after current_class_type is set
12583 up. (If we are processing inline definitions after exiting a
12584 class scope, current_class_type will be NULL_TREE until set above
12585 by push_nested_class.) */
12586 if (processing_template_decl)
12588 /* FIXME: Handle error_mark_node more gracefully. */
12589 tree newdecl1 = push_template_decl (decl1);
12590 if (newdecl1 != error_mark_node)
12594 /* We are now in the scope of the function being defined. */
12595 current_function_decl = decl1;
12597 /* Save the parm names or decls from this function's declarator
12598 where store_parm_decls will find them. */
12599 current_function_parms = DECL_ARGUMENTS (decl1);
12601 /* Make sure the parameter and return types are reasonable. When
12602 you declare a function, these types can be incomplete, but they
12603 must be complete when you define the function. */
12604 check_function_type (decl1, current_function_parms);
12606 /* Build the return declaration for the function. */
12607 restype = TREE_TYPE (fntype);
12608 if (DECL_RESULT (decl1) == NULL_TREE)
12612 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12613 DECL_ARTIFICIAL (resdecl) = 1;
12614 DECL_IGNORED_P (resdecl) = 1;
12615 DECL_RESULT (decl1) = resdecl;
12617 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12620 /* Let the user know we're compiling this function. */
12621 announce_function (decl1);
12623 /* Record the decl so that the function name is defined.
12624 If we already have a decl for this name, and it is a FUNCTION_DECL,
12625 use the old decl. */
12626 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12628 /* A specialization is not used to guide overload resolution. */
12629 if (!DECL_FUNCTION_MEMBER_P (decl1)
12630 && !(DECL_USE_TEMPLATE (decl1) &&
12631 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12633 tree olddecl = pushdecl (decl1);
12635 if (olddecl == error_mark_node)
12636 /* If something went wrong when registering the declaration,
12637 use DECL1; we have to have a FUNCTION_DECL to use when
12638 parsing the body of the function. */
12642 /* Otherwise, OLDDECL is either a previous declaration
12643 of the same function or DECL1 itself. */
12645 if (warn_missing_declarations
12646 && olddecl == decl1
12647 && !DECL_MAIN_P (decl1)
12648 && TREE_PUBLIC (decl1)
12649 && !DECL_DECLARED_INLINE_P (decl1))
12653 /* Check whether DECL1 is in an anonymous
12655 for (context = DECL_CONTEXT (decl1);
12657 context = DECL_CONTEXT (context))
12659 if (TREE_CODE (context) == NAMESPACE_DECL
12660 && DECL_NAME (context) == NULL_TREE)
12664 if (context == NULL)
12665 warning (OPT_Wmissing_declarations,
12666 "no previous declaration for %q+D", decl1);
12674 /* We need to set the DECL_CONTEXT. */
12675 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12676 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12678 fntype = TREE_TYPE (decl1);
12680 /* If #pragma weak applies, mark the decl appropriately now.
12681 The pragma only applies to global functions. Because
12682 determining whether or not the #pragma applies involves
12683 computing the mangled name for the declaration, we cannot
12684 apply the pragma until after we have merged this declaration
12685 with any previous declarations; if the original declaration
12686 has a linkage specification, that specification applies to
12687 the definition as well, and may affect the mangled name. */
12688 if (DECL_FILE_SCOPE_P (decl1))
12689 maybe_apply_pragma_weak (decl1);
12692 /* Reset this in case the call to pushdecl changed it. */
12693 current_function_decl = decl1;
12695 gcc_assert (DECL_INITIAL (decl1));
12697 /* This function may already have been parsed, in which case just
12698 return; our caller will skip over the body without parsing. */
12699 if (DECL_INITIAL (decl1) != error_mark_node)
12702 /* Initialize RTL machinery. We cannot do this until
12703 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12704 even when processing a template; this is how we get
12705 CFUN set up, and our per-function variables initialized.
12706 FIXME factor out the non-RTL stuff. */
12707 bl = current_binding_level;
12708 allocate_struct_function (decl1, processing_template_decl);
12710 /* Initialize the language data structures. Whenever we start
12711 a new function, we destroy temporaries in the usual way. */
12712 cfun->language = ggc_alloc_cleared_language_function ();
12713 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12714 current_binding_level = bl;
12716 /* Start the statement-tree, start the tree now. */
12717 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12719 /* If we are (erroneously) defining a function that we have already
12720 defined before, wipe out what we knew before. */
12721 if (!DECL_PENDING_INLINE_P (decl1))
12722 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12724 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12726 /* We know that this was set up by `grokclassfn'. We do not
12727 wait until `store_parm_decls', since evil parse errors may
12728 never get us to that point. Here we keep the consistency
12729 between `current_class_type' and `current_class_ptr'. */
12730 tree t = DECL_ARGUMENTS (decl1);
12732 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12733 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12735 cp_function_chain->x_current_class_ref
12736 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12737 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12738 cp_function_chain->x_current_class_ptr = t;
12740 /* Constructors and destructors need to know whether they're "in
12741 charge" of initializing virtual base classes. */
12742 t = DECL_CHAIN (t);
12743 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12745 current_in_charge_parm = t;
12746 t = DECL_CHAIN (t);
12748 if (DECL_HAS_VTT_PARM_P (decl1))
12750 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12751 current_vtt_parm = t;
12755 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12756 /* Implicitly-defined methods (like the
12757 destructor for a class in which no destructor
12758 is explicitly declared) must not be defined
12759 until their definition is needed. So, we
12760 ignore interface specifications for
12761 compiler-generated functions. */
12762 && !DECL_ARTIFICIAL (decl1));
12764 if (processing_template_decl)
12765 /* Don't mess with interface flags. */;
12766 else if (DECL_INTERFACE_KNOWN (decl1))
12768 tree ctx = decl_function_context (decl1);
12770 if (DECL_NOT_REALLY_EXTERN (decl1))
12771 DECL_EXTERNAL (decl1) = 0;
12773 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12774 && TREE_PUBLIC (ctx))
12775 /* This is a function in a local class in an extern inline
12777 comdat_linkage (decl1);
12779 /* If this function belongs to an interface, it is public.
12780 If it belongs to someone else's interface, it is also external.
12781 This only affects inlines and template instantiations. */
12782 else if (!finfo->interface_unknown && honor_interface)
12784 if (DECL_DECLARED_INLINE_P (decl1)
12785 || DECL_TEMPLATE_INSTANTIATION (decl1))
12787 DECL_EXTERNAL (decl1)
12788 = (finfo->interface_only
12789 || (DECL_DECLARED_INLINE_P (decl1)
12790 && ! flag_implement_inlines
12791 && !DECL_VINDEX (decl1)));
12793 /* For WIN32 we also want to put these in linkonce sections. */
12794 maybe_make_one_only (decl1);
12797 DECL_EXTERNAL (decl1) = 0;
12798 DECL_INTERFACE_KNOWN (decl1) = 1;
12799 /* If this function is in an interface implemented in this file,
12800 make sure that the back end knows to emit this function
12802 if (!DECL_EXTERNAL (decl1))
12803 mark_needed (decl1);
12805 else if (finfo->interface_unknown && finfo->interface_only
12806 && honor_interface)
12808 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12809 interface, we will have both finfo->interface_unknown and
12810 finfo->interface_only set. In that case, we don't want to
12811 use the normal heuristics because someone will supply a
12812 #pragma implementation elsewhere, and deducing it here would
12813 produce a conflict. */
12814 comdat_linkage (decl1);
12815 DECL_EXTERNAL (decl1) = 0;
12816 DECL_INTERFACE_KNOWN (decl1) = 1;
12817 DECL_DEFER_OUTPUT (decl1) = 1;
12821 /* This is a definition, not a reference.
12822 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12823 if (!GNU_INLINE_P (decl1))
12824 DECL_EXTERNAL (decl1) = 0;
12826 if ((DECL_DECLARED_INLINE_P (decl1)
12827 || DECL_TEMPLATE_INSTANTIATION (decl1))
12828 && ! DECL_INTERFACE_KNOWN (decl1))
12829 DECL_DEFER_OUTPUT (decl1) = 1;
12831 DECL_INTERFACE_KNOWN (decl1) = 1;
12834 /* Determine the ELF visibility attribute for the function. We must not
12835 do this before calling "pushdecl", as we must allow "duplicate_decls"
12836 to merge any attributes appropriately. We also need to wait until
12838 if (!DECL_CLONED_FUNCTION_P (decl1))
12839 determine_visibility (decl1);
12841 begin_scope (sk_function_parms, decl1);
12845 if (DECL_DESTRUCTOR_P (decl1)
12846 || (DECL_CONSTRUCTOR_P (decl1)
12847 && targetm.cxx.cdtor_returns_this ()))
12849 cdtor_label = build_decl (input_location,
12850 LABEL_DECL, NULL_TREE, NULL_TREE);
12851 DECL_CONTEXT (cdtor_label) = current_function_decl;
12854 start_fname_decls ();
12856 store_parm_decls (current_function_parms);
12860 /* Like start_preparsed_function, except that instead of a
12861 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12863 Returns 1 on success. If the DECLARATOR is not suitable for a function
12864 (it defines a datum instead), we return 0, which tells
12865 yyparse to report a parse error. */
12868 start_function (cp_decl_specifier_seq *declspecs,
12869 const cp_declarator *declarator,
12874 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12875 if (decl1 == error_mark_node)
12877 /* If the declarator is not suitable for a function definition,
12878 cause a syntax error. */
12879 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12881 error ("invalid function declaration");
12885 if (DECL_MAIN_P (decl1))
12886 /* main must return int. grokfndecl should have corrected it
12887 (and issued a diagnostic) if the user got it wrong. */
12888 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12889 integer_type_node));
12891 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12896 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12900 use_eh_spec_block (tree fn)
12902 return (flag_exceptions && flag_enforce_eh_specs
12903 && !processing_template_decl
12904 && !type_throw_all_p (TREE_TYPE (fn))
12905 /* We insert the EH_SPEC_BLOCK only in the original
12906 function; then, it is copied automatically to the
12908 && !DECL_CLONED_FUNCTION_P (fn)
12909 /* Implicitly-generated constructors and destructors have
12910 exception specifications. However, those specifications
12911 are the union of the possible exceptions specified by the
12912 constructors/destructors for bases and members, so no
12913 unallowed exception will ever reach this function. By
12914 not creating the EH_SPEC_BLOCK we save a little memory,
12915 and we avoid spurious warnings about unreachable
12917 && !DECL_DEFAULTED_FN (fn));
12920 /* Store the parameter declarations into the current function declaration.
12921 This is called after parsing the parameter declarations, before
12922 digesting the body of the function.
12924 Also install to binding contour return value identifier, if any. */
12927 store_parm_decls (tree current_function_parms)
12929 tree fndecl = current_function_decl;
12932 /* This is a chain of any other decls that came in among the parm
12933 declarations. If a parm is declared with enum {foo, bar} x;
12934 then CONST_DECLs for foo and bar are put here. */
12935 tree nonparms = NULL_TREE;
12937 if (current_function_parms)
12939 /* This case is when the function was defined with an ANSI prototype.
12940 The parms already have decls, so we need not do anything here
12941 except record them as in effect
12942 and complain if any redundant old-style parm decls were written. */
12944 tree specparms = current_function_parms;
12947 /* Must clear this because it might contain TYPE_DECLs declared
12949 current_binding_level->names = NULL;
12951 /* If we're doing semantic analysis, then we'll call pushdecl
12952 for each of these. We must do them in reverse order so that
12953 they end in the correct forward order. */
12954 specparms = nreverse (specparms);
12956 for (parm = specparms; parm; parm = next)
12958 next = DECL_CHAIN (parm);
12959 if (TREE_CODE (parm) == PARM_DECL)
12961 if (DECL_NAME (parm) == NULL_TREE
12962 || TREE_CODE (parm) != VOID_TYPE)
12965 error ("parameter %qD declared void", parm);
12969 /* If we find an enum constant or a type tag,
12970 put it aside for the moment. */
12971 TREE_CHAIN (parm) = NULL_TREE;
12972 nonparms = chainon (nonparms, parm);
12976 /* Get the decls in their original chain order and record in the
12977 function. This is all and only the PARM_DECLs that were
12978 pushed into scope by the loop above. */
12979 DECL_ARGUMENTS (fndecl) = getdecls ();
12982 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12984 /* Now store the final chain of decls for the arguments
12985 as the decl-chain of the current lexical scope.
12986 Put the enumerators in as well, at the front so that
12987 DECL_ARGUMENTS is not modified. */
12988 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12990 if (use_eh_spec_block (current_function_decl))
12991 current_eh_spec_block = begin_eh_spec_block ();
12995 /* We have finished doing semantic analysis on DECL, but have not yet
12996 generated RTL for its body. Save away our current state, so that
12997 when we want to generate RTL later we know what to do. */
13000 save_function_data (tree decl)
13002 struct language_function *f;
13004 /* Save the language-specific per-function data so that we can
13005 get it back when we really expand this function. */
13006 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13009 f = ggc_alloc_language_function ();
13010 memcpy (f, cp_function_chain, sizeof (struct language_function));
13011 DECL_SAVED_FUNCTION_DATA (decl) = f;
13013 /* Clear out the bits we don't need. */
13014 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13015 f->bindings = NULL;
13016 f->x_local_names = NULL;
13020 /* Set the return value of the constructor (if present). */
13023 finish_constructor_body (void)
13028 if (targetm.cxx.cdtor_returns_this ()
13029 && (! TYPE_FOR_JAVA (current_class_type)))
13031 /* Any return from a constructor will end up here. */
13032 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13034 val = DECL_ARGUMENTS (current_function_decl);
13035 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13036 DECL_RESULT (current_function_decl), val);
13037 /* Return the address of the object. */
13038 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13039 add_stmt (exprstmt);
13043 /* Do all the processing for the beginning of a destructor; set up the
13044 vtable pointers and cleanups for bases and members. */
13047 begin_destructor_body (void)
13049 tree compound_stmt;
13051 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13052 issued an error message. We still want to try to process the
13053 body of the function, but initialize_vtbl_ptrs will crash if
13054 TYPE_BINFO is NULL. */
13055 if (COMPLETE_TYPE_P (current_class_type))
13057 compound_stmt = begin_compound_stmt (0);
13058 /* Make all virtual function table pointers in non-virtual base
13059 classes point to CURRENT_CLASS_TYPE's virtual function
13061 initialize_vtbl_ptrs (current_class_ptr);
13062 finish_compound_stmt (compound_stmt);
13064 /* And insert cleanups for our bases and members so that they
13065 will be properly destroyed if we throw. */
13066 push_base_cleanups ();
13070 /* At the end of every destructor we generate code to delete the object if
13071 necessary. Do that now. */
13074 finish_destructor_body (void)
13078 /* Any return from a destructor will end up here; that way all base
13079 and member cleanups will be run when the function returns. */
13080 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13082 /* In a virtual destructor, we must call delete. */
13083 if (DECL_VIRTUAL_P (current_function_decl))
13086 tree virtual_size = cxx_sizeof (current_class_type);
13090 At the point of definition of a virtual destructor (including
13091 an implicit definition), non-placement operator delete shall
13092 be looked up in the scope of the destructor's class and if
13093 found shall be accessible and unambiguous. */
13094 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13096 /*global_p=*/false,
13097 /*placement=*/NULL_TREE,
13098 /*alloc_fn=*/NULL_TREE);
13100 if_stmt = begin_if_stmt ();
13101 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13102 current_in_charge_parm,
13105 finish_expr_stmt (exprstmt);
13106 finish_then_clause (if_stmt);
13107 finish_if_stmt (if_stmt);
13110 if (targetm.cxx.cdtor_returns_this ())
13114 val = DECL_ARGUMENTS (current_function_decl);
13115 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13116 DECL_RESULT (current_function_decl), val);
13117 /* Return the address of the object. */
13118 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13119 add_stmt (exprstmt);
13123 /* Do the necessary processing for the beginning of a function body, which
13124 in this case includes member-initializers, but not the catch clauses of
13125 a function-try-block. Currently, this means opening a binding level
13126 for the member-initializers (in a ctor), member cleanups (in a dtor),
13127 and capture proxies (in a lambda operator()). */
13130 begin_function_body (void)
13134 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13137 if (processing_template_decl)
13138 /* Do nothing now. */;
13140 /* Always keep the BLOCK node associated with the outermost pair of
13141 curly braces of a function. These are needed for correct
13142 operation of dwarfout.c. */
13143 keep_next_level (true);
13145 stmt = begin_compound_stmt (BCS_FN_BODY);
13147 if (processing_template_decl)
13148 /* Do nothing now. */;
13149 else if (DECL_DESTRUCTOR_P (current_function_decl))
13150 begin_destructor_body ();
13155 /* Do the processing for the end of a function body. Currently, this means
13156 closing out the cleanups for fully-constructed bases and members, and in
13157 the case of the destructor, deleting the object if desired. Again, this
13158 is only meaningful for [cd]tors, since they are the only functions where
13159 there is a significant distinction between the main body and any
13160 function catch clauses. Handling, say, main() return semantics here
13161 would be wrong, as flowing off the end of a function catch clause for
13162 main() would also need to return 0. */
13165 finish_function_body (tree compstmt)
13167 if (compstmt == NULL_TREE)
13170 /* Close the block. */
13171 finish_compound_stmt (compstmt);
13173 if (processing_template_decl)
13174 /* Do nothing now. */;
13175 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13176 finish_constructor_body ();
13177 else if (DECL_DESTRUCTOR_P (current_function_decl))
13178 finish_destructor_body ();
13181 /* Given a function, returns the BLOCK corresponding to the outermost level
13182 of curly braces, skipping the artificial block created for constructor
13186 outer_curly_brace_block (tree fndecl)
13188 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13189 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13190 /* Skip the artificial function body block. */
13191 block = BLOCK_SUBBLOCKS (block);
13195 /* If FNDECL is a class's key method, add the class to the list of
13196 keyed classes that should be emitted. */
13199 record_key_method_defined (tree fndecl)
13201 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13202 && DECL_VIRTUAL_P (fndecl)
13203 && !processing_template_decl)
13205 tree fnclass = DECL_CONTEXT (fndecl);
13206 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13207 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13211 /* Subroutine of finish_function.
13212 Save the body of constexpr functions for possible
13213 future compile time evaluation. */
13216 maybe_save_function_definition (tree fun)
13218 if (!processing_template_decl
13219 && DECL_DECLARED_CONSTEXPR_P (fun)
13220 && !DECL_CLONED_FUNCTION_P (fun))
13221 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13224 /* Finish up a function declaration and compile that function
13225 all the way to assembler language output. The free the storage
13226 for the function definition.
13228 FLAGS is a bitwise or of the following values:
13230 We just finished processing the body of an in-class inline
13231 function definition. (This processing will have taken place
13232 after the class definition is complete.) */
13235 finish_function (int flags)
13237 tree fndecl = current_function_decl;
13238 tree fntype, ctype = NULL_TREE;
13239 int inclass_inline = (flags & 2) != 0;
13241 /* When we get some parse errors, we can end up without a
13242 current_function_decl, so cope. */
13243 if (fndecl == NULL_TREE)
13244 return error_mark_node;
13246 if (c_dialect_objc ())
13247 objc_finish_function ();
13249 gcc_assert (!defer_mark_used_calls);
13250 defer_mark_used_calls = true;
13252 record_key_method_defined (fndecl);
13254 fntype = TREE_TYPE (fndecl);
13256 /* TREE_READONLY (fndecl) = 1;
13257 This caused &foo to be of type ptr-to-const-function
13258 which then got a warning when stored in a ptr-to-function variable. */
13260 gcc_assert (building_stmt_list_p ());
13261 /* The current function is being defined, so its DECL_INITIAL should
13262 be set, and unless there's a multiple definition, it should be
13263 error_mark_node. */
13264 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13266 /* For a cloned function, we've already got all the code we need;
13267 there's no need to add any extra bits. */
13268 if (!DECL_CLONED_FUNCTION_P (fndecl))
13270 if (DECL_MAIN_P (current_function_decl))
13272 /* Make it so that `main' always returns 0 by default (or
13275 finish_return_stmt (integer_one_node);
13277 finish_return_stmt (integer_zero_node);
13281 if (use_eh_spec_block (current_function_decl))
13282 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13283 (TREE_TYPE (current_function_decl)),
13284 current_eh_spec_block);
13287 /* If we're saving up tree structure, tie off the function now. */
13288 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13290 finish_fname_decls ();
13292 /* If this function can't throw any exceptions, remember that. */
13293 if (!processing_template_decl
13294 && !cp_function_chain->can_throw
13295 && !flag_non_call_exceptions
13296 && !decl_replaceable_p (fndecl))
13297 TREE_NOTHROW (fndecl) = 1;
13299 /* This must come after expand_function_end because cleanups might
13300 have declarations (from inline functions) that need to go into
13301 this function's blocks. */
13303 /* If the current binding level isn't the outermost binding level
13304 for this function, either there is a bug, or we have experienced
13305 syntax errors and the statement tree is malformed. */
13306 if (current_binding_level->kind != sk_function_parms)
13308 /* Make sure we have already experienced errors. */
13309 gcc_assert (errorcount);
13311 /* Throw away the broken statement tree and extra binding
13313 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13315 while (current_binding_level->kind != sk_function_parms)
13317 if (current_binding_level->kind == sk_class)
13318 pop_nested_class ();
13320 poplevel (0, 0, 0);
13323 poplevel (1, 0, 1);
13325 /* Statements should always be full-expressions at the outermost set
13326 of curly braces for a function. */
13327 gcc_assert (stmts_are_full_exprs_p ());
13329 /* Save constexpr function body before it gets munged by
13330 the NRV transformation. */
13331 maybe_save_function_definition (fndecl);
13333 /* Set up the named return value optimization, if we can. Candidate
13334 variables are selected in check_return_expr. */
13335 if (current_function_return_value)
13337 tree r = current_function_return_value;
13340 if (r != error_mark_node
13341 /* This is only worth doing for fns that return in memory--and
13342 simpler, since we don't have to worry about promoted modes. */
13343 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13344 /* Only allow this for variables declared in the outer scope of
13345 the function so we know that their lifetime always ends with a
13346 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13347 we were to do this optimization in tree-ssa. */
13348 && (outer = outer_curly_brace_block (fndecl))
13349 && chain_member (r, BLOCK_VARS (outer)))
13350 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13352 current_function_return_value = NULL_TREE;
13355 /* Remember that we were in class scope. */
13356 if (current_class_name)
13357 ctype = current_class_type;
13359 /* Must mark the RESULT_DECL as being in this function. */
13360 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13362 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13363 to the FUNCTION_DECL node itself. */
13364 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13366 /* Save away current state, if appropriate. */
13367 if (!processing_template_decl)
13368 save_function_data (fndecl);
13370 /* Complain if there's just no return statement. */
13371 if (warn_return_type
13372 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13373 && !dependent_type_p (TREE_TYPE (fntype))
13374 && !current_function_returns_value && !current_function_returns_null
13375 /* Don't complain if we abort or throw. */
13376 && !current_function_returns_abnormally
13377 /* Don't complain if we are declared noreturn. */
13378 && !TREE_THIS_VOLATILE (fndecl)
13379 && !DECL_NAME (DECL_RESULT (fndecl))
13380 && !TREE_NO_WARNING (fndecl)
13381 /* Structor return values (if any) are set by the compiler. */
13382 && !DECL_CONSTRUCTOR_P (fndecl)
13383 && !DECL_DESTRUCTOR_P (fndecl))
13385 warning (OPT_Wreturn_type,
13386 "no return statement in function returning non-void");
13387 TREE_NO_WARNING (fndecl) = 1;
13390 /* Store the end of the function, so that we get good line number
13391 info for the epilogue. */
13392 cfun->function_end_locus = input_location;
13394 /* Complain about parameters that are only set, but never otherwise used. */
13395 if (warn_unused_but_set_parameter
13396 && !processing_template_decl
13397 && errorcount == unused_but_set_errorcount
13398 && !DECL_CLONED_FUNCTION_P (fndecl))
13402 for (decl = DECL_ARGUMENTS (fndecl);
13404 decl = DECL_CHAIN (decl))
13405 if (TREE_USED (decl)
13406 && TREE_CODE (decl) == PARM_DECL
13407 && !DECL_READ_P (decl)
13408 && DECL_NAME (decl)
13409 && !DECL_ARTIFICIAL (decl)
13410 && !TREE_NO_WARNING (decl)
13411 && !DECL_IN_SYSTEM_HEADER (decl)
13412 && TREE_TYPE (decl) != error_mark_node
13413 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13414 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13415 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13416 warning (OPT_Wunused_but_set_parameter,
13417 "parameter %q+D set but not used", decl);
13418 unused_but_set_errorcount = errorcount;
13421 /* Complain about locally defined typedefs that are not used in this
13423 maybe_warn_unused_local_typedefs ();
13425 /* Genericize before inlining. */
13426 if (!processing_template_decl)
13428 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13429 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13430 cp_genericize (fndecl);
13431 /* Clear out the bits we don't need. */
13432 f->x_current_class_ptr = NULL;
13433 f->x_current_class_ref = NULL;
13434 f->x_eh_spec_block = NULL;
13435 f->x_in_charge_parm = NULL;
13436 f->x_vtt_parm = NULL;
13437 f->x_return_value = NULL;
13438 f->bindings = NULL;
13439 f->extern_decl_map = NULL;
13441 /* Clear out the bits we don't need. */
13442 local_names = NULL;
13444 /* We're leaving the context of this function, so zap cfun. It's still in
13445 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13447 current_function_decl = NULL;
13449 /* If this is an in-class inline definition, we may have to pop the
13450 bindings for the template parameters that we added in
13451 maybe_begin_member_template_processing when start_function was
13453 if (inclass_inline)
13454 maybe_end_member_template_processing ();
13456 /* Leave the scope of the class. */
13458 pop_nested_class ();
13463 current_function_decl = NULL_TREE;
13465 defer_mark_used_calls = false;
13466 if (deferred_mark_used_calls)
13471 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13473 VEC_free (tree, gc, deferred_mark_used_calls);
13479 /* Create the FUNCTION_DECL for a function definition.
13480 DECLSPECS and DECLARATOR are the parts of the declaration;
13481 they describe the return type and the name of the function,
13482 but twisted together in a fashion that parallels the syntax of C.
13484 This function creates a binding context for the function body
13485 as well as setting up the FUNCTION_DECL in current_function_decl.
13487 Returns a FUNCTION_DECL on success.
13489 If the DECLARATOR is not suitable for a function (it defines a datum
13490 instead), we return 0, which tells yyparse to report a parse error.
13492 May return void_type_node indicating that this method is actually
13493 a friend. See grokfield for more details.
13495 Came here with a `.pushlevel' .
13497 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13498 CHANGES TO CODE IN `grokfield'. */
13501 grokmethod (cp_decl_specifier_seq *declspecs,
13502 const cp_declarator *declarator, tree attrlist)
13504 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13507 if (fndecl == error_mark_node)
13508 return error_mark_node;
13510 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13512 error ("invalid member function declaration");
13513 return error_mark_node;
13517 cplus_decl_attributes (&fndecl, attrlist, 0);
13519 /* Pass friends other than inline friend functions back. */
13520 if (fndecl == void_type_node)
13523 if (DECL_IN_AGGR_P (fndecl))
13525 if (DECL_CLASS_SCOPE_P (fndecl))
13526 error ("%qD is already defined in class %qT", fndecl,
13527 DECL_CONTEXT (fndecl));
13528 return error_mark_node;
13531 check_template_shadow (fndecl);
13533 DECL_DECLARED_INLINE_P (fndecl) = 1;
13534 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13536 /* We process method specializations in finish_struct_1. */
13537 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13539 fndecl = push_template_decl (fndecl);
13540 if (fndecl == error_mark_node)
13544 if (! DECL_FRIEND_P (fndecl))
13546 if (DECL_CHAIN (fndecl))
13548 fndecl = copy_node (fndecl);
13549 TREE_CHAIN (fndecl) = NULL_TREE;
13553 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13555 DECL_IN_AGGR_P (fndecl) = 1;
13560 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13561 we can lay it out later, when and if its type becomes complete. */
13564 maybe_register_incomplete_var (tree var)
13566 gcc_assert (TREE_CODE (var) == VAR_DECL);
13568 /* Keep track of variables with incomplete types. */
13569 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13570 && DECL_EXTERNAL (var))
13572 tree inner_type = TREE_TYPE (var);
13574 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13575 inner_type = TREE_TYPE (inner_type);
13576 inner_type = TYPE_MAIN_VARIANT (inner_type);
13578 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13579 /* RTTI TD entries are created while defining the type_info. */
13580 || (TYPE_LANG_SPECIFIC (inner_type)
13581 && TYPE_BEING_DEFINED (inner_type)))
13584 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13586 iv->incomplete_type = inner_type;
13591 /* Called when a class type (given by TYPE) is defined. If there are
13592 any existing VAR_DECLs whose type has been completed by this
13593 declaration, update them now. */
13596 complete_vars (tree type)
13599 incomplete_var *iv;
13601 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13603 if (same_type_p (type, iv->incomplete_type))
13605 tree var = iv->decl;
13606 tree type = TREE_TYPE (var);
13607 /* Complete the type of the variable. The VAR_DECL itself
13608 will be laid out in expand_expr. */
13609 complete_type (type);
13610 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13611 /* Remove this entry from the list. */
13612 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13618 /* Check for pending declarations which may have abstract type. */
13619 complete_type_check_abstract (type);
13622 /* If DECL is of a type which needs a cleanup, build and return an
13623 expression to perform that cleanup here. Return NULL_TREE if no
13624 cleanup need be done. */
13627 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13633 /* Assume no cleanup is required. */
13634 cleanup = NULL_TREE;
13636 if (error_operand_p (decl))
13639 /* Handle "__attribute__((cleanup))". We run the cleanup function
13640 before the destructor since the destructor is what actually
13641 terminates the lifetime of the object. */
13642 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13649 /* Get the name specified by the user for the cleanup function. */
13650 id = TREE_VALUE (TREE_VALUE (attr));
13651 /* Look up the name to find the cleanup function to call. It is
13652 important to use lookup_name here because that is what is
13653 used in c-common.c:handle_cleanup_attribute when performing
13654 initial checks on the attribute. Note that those checks
13655 include ensuring that the function found is not an overloaded
13656 function, or an object with an overloaded call operator,
13657 etc.; we can rely on the fact that the function found is an
13658 ordinary FUNCTION_DECL. */
13659 fn = lookup_name (id);
13660 arg = build_address (decl);
13662 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13663 if (cleanup == error_mark_node)
13664 return error_mark_node;
13666 /* Handle ordinary C++ destructors. */
13667 type = TREE_TYPE (decl);
13668 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13670 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13671 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13672 && CLASSTYPE_VBASECLASSES (type));
13676 if (TREE_CODE (type) == ARRAY_TYPE)
13679 addr = build_address (decl);
13681 /* Optimize for space over speed here. */
13682 if (!has_vbases || flag_expensive_optimizations)
13683 flags |= LOOKUP_NONVIRTUAL;
13685 call = build_delete (TREE_TYPE (addr), addr,
13686 sfk_complete_destructor, flags, 0, complain);
13687 if (call == error_mark_node)
13688 cleanup = error_mark_node;
13690 cleanup = cp_build_compound_expr (cleanup, call, complain);
13698 /* When a stmt has been parsed, this function is called. */
13705 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13706 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13707 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13710 static_fn_type (tree memfntype)
13715 if (TYPE_PTRMEMFUNC_P (memfntype))
13716 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13717 if (POINTER_TYPE_P (memfntype)
13718 || TREE_CODE (memfntype) == FUNCTION_DECL)
13719 memfntype = TREE_TYPE (memfntype);
13720 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13722 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13723 args = TYPE_ARG_TYPES (memfntype);
13724 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13725 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13726 fntype = (cp_build_type_attribute_variant
13727 (fntype, TYPE_ATTRIBUTES (memfntype)));
13728 fntype = (build_exception_variant
13729 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13733 /* DECL was originally constructed as a non-static member function,
13734 but turned out to be static. Update it accordingly. */
13737 revert_static_member_fn (tree decl)
13739 tree stype = static_fn_type (decl);
13740 cp_cv_quals quals = type_memfn_quals (stype);
13742 if (quals != TYPE_UNQUALIFIED)
13743 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13745 TREE_TYPE (decl) = stype;
13747 if (DECL_ARGUMENTS (decl))
13748 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13749 DECL_STATIC_FUNCTION_P (decl) = 1;
13752 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13753 one of the language-independent trees. */
13755 enum cp_tree_node_structure_enum
13756 cp_tree_node_structure (union lang_tree_node * t)
13758 switch (TREE_CODE (&t->generic))
13760 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13761 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13762 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13763 case OVERLOAD: return TS_CP_OVERLOAD;
13764 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13765 case PTRMEM_CST: return TS_CP_PTRMEM;
13766 case BASELINK: return TS_CP_BASELINK;
13767 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13768 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13769 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13770 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13771 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13772 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13773 default: return TS_CP_GENERIC;
13777 /* Build the void_list_node (void_type_node having been created). */
13779 build_void_list_node (void)
13781 tree t = build_tree_list (NULL_TREE, void_type_node);
13786 cp_missing_noreturn_ok_p (tree decl)
13788 /* A missing noreturn is ok for the `main' function. */
13789 return DECL_MAIN_P (decl);
13792 /* Return the COMDAT group into which DECL should be placed. */
13795 cxx_comdat_group (tree decl)
13799 /* Virtual tables, construction virtual tables, and virtual table
13800 tables all go in a single COMDAT group, named after the primary
13802 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13803 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13804 /* For all other DECLs, the COMDAT group is the mangled name of the
13805 declaration itself. */
13808 while (DECL_THUNK_P (decl))
13810 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13811 into the same section as the target function. In that case
13812 we must return target's name. */
13813 tree target = THUNK_TARGET (decl);
13814 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13815 && DECL_SECTION_NAME (target) != NULL
13816 && DECL_ONE_ONLY (target))
13821 name = DECL_ASSEMBLER_NAME (decl);
13827 #include "gt-cp-decl.h"