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, 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, tree *);
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 (DECL_P (olddecl)
1207 && TREE_CODE (newdecl) == FUNCTION_DECL
1208 && TREE_CODE (olddecl) == FUNCTION_DECL
1209 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1211 if (DECL_DECLARED_INLINE_P (newdecl)
1212 && DECL_UNINLINABLE (newdecl)
1213 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1214 /* Already warned elsewhere. */;
1215 else if (DECL_DECLARED_INLINE_P (olddecl)
1216 && DECL_UNINLINABLE (olddecl)
1217 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1218 /* Already warned. */;
1219 else if (DECL_DECLARED_INLINE_P (newdecl)
1220 && DECL_UNINLINABLE (olddecl)
1221 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1223 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1225 warning (OPT_Wattributes, "previous declaration of %q+D "
1226 "with attribute noinline", olddecl);
1228 else if (DECL_DECLARED_INLINE_P (olddecl)
1229 && DECL_UNINLINABLE (newdecl)
1230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1232 warning (OPT_Wattributes, "function %q+D redeclared with "
1233 "attribute noinline", newdecl);
1234 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1239 /* Check for redeclaration and other discrepancies. */
1240 if (TREE_CODE (olddecl) == FUNCTION_DECL
1241 && DECL_ARTIFICIAL (olddecl))
1243 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1244 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1246 /* Avoid warnings redeclaring built-ins which have not been
1247 explicitly declared. */
1248 if (DECL_ANTICIPATED (olddecl))
1251 /* If you declare a built-in or predefined function name as static,
1252 the old definition is overridden, but optionally warn this was a
1253 bad choice of name. */
1254 if (! TREE_PUBLIC (newdecl))
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1260 /* Discard the old built-in function. */
1263 /* If the built-in is not ansi, then programs can override
1264 it even globally without an error. */
1265 else if (! DECL_BUILT_IN (olddecl))
1266 warning (0, "library function %q#D redeclared as non-function %q#D",
1270 error ("declaration of %q#D", newdecl);
1271 error ("conflicts with built-in declaration %q#D",
1276 else if (!types_match)
1278 /* Avoid warnings redeclaring built-ins which have not been
1279 explicitly declared. */
1280 if (DECL_ANTICIPATED (olddecl))
1282 /* Deal with fileptr_type_node. FILE type is not known
1283 at the time we create the builtins. */
1286 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1287 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1289 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1292 else if (TREE_VALUE (t2) == fileptr_type_node)
1294 tree t = TREE_VALUE (t1);
1296 if (TREE_CODE (t) == POINTER_TYPE
1297 && TYPE_NAME (TREE_TYPE (t))
1298 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1299 == get_identifier ("FILE")
1300 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1302 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1305 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1306 types_match = decls_match (newdecl, olddecl);
1308 return duplicate_decls (newdecl, olddecl,
1310 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1313 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1316 else if ((DECL_EXTERN_C_P (newdecl)
1317 && DECL_EXTERN_C_P (olddecl))
1318 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1321 /* A near match; override the builtin. */
1323 if (TREE_PUBLIC (newdecl))
1325 warning (0, "new declaration %q#D", newdecl);
1326 warning (0, "ambiguates built-in declaration %q#D",
1330 warning (OPT_Wshadow,
1331 DECL_BUILT_IN (olddecl)
1332 ? G_("shadowing built-in function %q#D")
1333 : G_("shadowing library function %q#D"), olddecl);
1336 /* Discard the old built-in function. */
1339 /* Replace the old RTL to avoid problems with inlining. */
1340 COPY_DECL_RTL (newdecl, olddecl);
1342 /* Even if the types match, prefer the new declarations type for
1343 built-ins which have not been explicitly declared, for
1344 exception lists, etc... */
1345 else if (DECL_IS_BUILTIN (olddecl))
1347 tree type = TREE_TYPE (newdecl);
1348 tree attribs = (*targetm.merge_type_attributes)
1349 (TREE_TYPE (olddecl), type);
1351 type = cp_build_type_attribute_variant (type, attribs);
1352 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1355 /* If a function is explicitly declared "throw ()", propagate that to
1356 the corresponding builtin. */
1357 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1358 && DECL_ANTICIPATED (olddecl)
1359 && TREE_NOTHROW (newdecl)
1360 && !TREE_NOTHROW (olddecl)
1361 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1362 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1364 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1366 /* Whether or not the builtin can throw exceptions has no
1367 bearing on this declarator. */
1368 TREE_NOTHROW (olddecl) = 0;
1370 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1372 /* If a builtin function is redeclared as `static', merge
1373 the declarations, but make the original one static. */
1374 DECL_THIS_STATIC (olddecl) = 1;
1375 TREE_PUBLIC (olddecl) = 0;
1377 /* Make the old declaration consistent with the new one so
1378 that all remnants of the builtin-ness of this function
1379 will be banished. */
1380 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1381 COPY_DECL_RTL (newdecl, olddecl);
1384 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1386 /* C++ Standard, 3.3, clause 4:
1387 "[Note: a namespace name or a class template name must be unique
1388 in its declarative region (7.3.2, clause 14). ]" */
1389 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1390 && TREE_CODE (newdecl) != NAMESPACE_DECL
1391 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1392 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1393 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1394 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1396 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1397 && TREE_CODE (newdecl) != TYPE_DECL)
1398 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1399 && TREE_CODE (olddecl) != TYPE_DECL))
1401 /* We do nothing special here, because C++ does such nasty
1402 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1403 get shadowed, and know that if we need to find a TYPE_DECL
1404 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1405 slot of the identifier. */
1409 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1410 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1411 || (TREE_CODE (olddecl) == FUNCTION_DECL
1412 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1416 error ("%q#D redeclared as different kind of symbol", newdecl);
1417 if (TREE_CODE (olddecl) == TREE_LIST)
1418 olddecl = TREE_VALUE (olddecl);
1419 error ("previous declaration of %q+#D", olddecl);
1421 return error_mark_node;
1423 else if (!types_match)
1425 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1426 /* These are certainly not duplicate declarations; they're
1427 from different scopes. */
1430 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1432 /* The name of a class template may not be declared to refer to
1433 any other template, class, function, object, namespace, value,
1434 or type in the same scope. */
1435 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1436 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1438 error ("declaration of template %q#D", newdecl);
1439 error ("conflicts with previous declaration %q+#D", olddecl);
1441 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1442 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1443 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1444 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1445 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1446 DECL_TEMPLATE_PARMS (olddecl))
1447 /* Template functions can be disambiguated by
1449 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1450 TREE_TYPE (TREE_TYPE (olddecl))))
1452 error ("new declaration %q#D", newdecl);
1453 error ("ambiguates old declaration %q+#D", olddecl);
1457 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1459 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1461 error ("declaration of C function %q#D conflicts with",
1463 error ("previous declaration %q+#D here", olddecl);
1466 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1467 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1471 return error_mark_node;
1478 error ("conflicting declaration %q#D", newdecl);
1479 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1480 return error_mark_node;
1483 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1484 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1485 && (!DECL_TEMPLATE_INFO (newdecl)
1486 || (DECL_TI_TEMPLATE (newdecl)
1487 != DECL_TI_TEMPLATE (olddecl))))
1488 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1489 && (!DECL_TEMPLATE_INFO (olddecl)
1490 || (DECL_TI_TEMPLATE (olddecl)
1491 != DECL_TI_TEMPLATE (newdecl))))))
1492 /* It's OK to have a template specialization and a non-template
1493 with the same type, or to have specializations of two
1494 different templates with the same type. Note that if one is a
1495 specialization, and the other is an instantiation of the same
1496 template, that we do not exit at this point. That situation
1497 can occur if we instantiate a template class, and then
1498 specialize one of its methods. This situation is valid, but
1499 the declarations must be merged in the usual way. */
1501 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1502 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1503 && !DECL_USE_TEMPLATE (newdecl))
1504 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1505 && !DECL_USE_TEMPLATE (olddecl))))
1506 /* One of the declarations is a template instantiation, and the
1507 other is not a template at all. That's OK. */
1509 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1511 /* In [namespace.alias] we have:
1513 In a declarative region, a namespace-alias-definition can be
1514 used to redefine a namespace-alias declared in that declarative
1515 region to refer only to the namespace to which it already
1518 Therefore, if we encounter a second alias directive for the same
1519 alias, we can just ignore the second directive. */
1520 if (DECL_NAMESPACE_ALIAS (newdecl)
1521 && (DECL_NAMESPACE_ALIAS (newdecl)
1522 == DECL_NAMESPACE_ALIAS (olddecl)))
1524 /* [namespace.alias]
1526 A namespace-name or namespace-alias shall not be declared as
1527 the name of any other entity in the same declarative region.
1528 A namespace-name defined at global scope shall not be
1529 declared as the name of any other entity in any global scope
1531 error ("declaration of namespace %qD conflicts with", newdecl);
1532 error ("previous declaration of namespace %q+D here", olddecl);
1533 return error_mark_node;
1537 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1540 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1541 if (DECL_NAME (olddecl) != NULL_TREE)
1542 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1543 ? "%q+#D previously defined here"
1544 : "%q+#D previously declared here", olddecl);
1545 return error_mark_node;
1547 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1548 && DECL_INITIAL (olddecl) != NULL_TREE
1549 && !prototype_p (TREE_TYPE (olddecl))
1550 && prototype_p (TREE_TYPE (newdecl)))
1552 /* Prototype decl follows defn w/o prototype. */
1553 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1554 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1555 "follows non-prototype definition here");
1557 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1558 || TREE_CODE (olddecl) == VAR_DECL)
1559 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1562 If two declarations of the same function or object
1563 specify different linkage-specifications ..., the program
1564 is ill-formed.... Except for functions with C++ linkage,
1565 a function declaration without a linkage specification
1566 shall not precede the first linkage specification for
1567 that function. A function can be declared without a
1568 linkage specification after an explicit linkage
1569 specification has been seen; the linkage explicitly
1570 specified in the earlier declaration is not affected by
1571 such a function declaration.
1573 DR 563 raises the question why the restrictions on
1574 functions should not also apply to objects. Older
1575 versions of G++ silently ignore the linkage-specification
1583 which is clearly wrong. Therefore, we now treat objects
1585 if (current_lang_depth () == 0)
1587 /* There is no explicit linkage-specification, so we use
1588 the linkage from the previous declaration. */
1589 if (!DECL_LANG_SPECIFIC (newdecl))
1590 retrofit_lang_decl (newdecl);
1591 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1595 error ("previous declaration of %q+#D with %qL linkage",
1596 olddecl, DECL_LANGUAGE (olddecl));
1597 error ("conflicts with new declaration with %qL linkage",
1598 DECL_LANGUAGE (newdecl));
1602 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1604 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1606 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1607 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1610 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1611 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1613 for (; t1 && t1 != void_list_node;
1614 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1615 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1617 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1620 permerror (input_location, "default argument given for parameter %d of %q#D",
1622 permerror (input_location, "after previous specification in %q+#D", olddecl);
1626 error ("default argument given for parameter %d of %q#D",
1628 error ("after previous specification in %q+#D",
1635 /* Do not merge an implicit typedef with an explicit one. In:
1639 typedef class A A __attribute__ ((foo));
1641 the attribute should apply only to the typedef. */
1642 if (TREE_CODE (olddecl) == TYPE_DECL
1643 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1644 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1647 /* If new decl is `static' and an `extern' was seen previously,
1649 warn_extern_redeclared_static (newdecl, olddecl);
1651 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1652 return error_mark_node;
1654 /* We have committed to returning 1 at this point. */
1655 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1657 /* Now that functions must hold information normally held
1658 by field decls, there is extra work to do so that
1659 declaration information does not get destroyed during
1661 if (DECL_VINDEX (olddecl))
1662 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1663 if (DECL_CONTEXT (olddecl))
1664 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1665 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1666 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1667 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1668 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1669 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1670 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1671 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1672 SET_OVERLOADED_OPERATOR_CODE
1673 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1674 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1676 /* Optionally warn about more than one declaration for the same
1677 name, but don't warn about a function declaration followed by a
1679 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1680 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1681 /* Don't warn about extern decl followed by definition. */
1682 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1683 /* Don't warn about friends, let add_friend take care of it. */
1684 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1686 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1687 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1690 if (DECL_DELETED_FN (newdecl))
1692 error ("deleted definition of %qD", newdecl);
1693 error ("after previous declaration %q+D", olddecl);
1695 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1698 /* Deal with C++: must preserve virtual function table size. */
1699 if (TREE_CODE (olddecl) == TYPE_DECL)
1701 tree newtype = TREE_TYPE (newdecl);
1702 tree oldtype = TREE_TYPE (olddecl);
1704 if (newtype != error_mark_node && oldtype != error_mark_node
1705 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1706 CLASSTYPE_FRIEND_CLASSES (newtype)
1707 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1709 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1712 /* Copy all the DECL_... slots specified in the new decl
1713 except for any that we copy here from the old type. */
1714 DECL_ATTRIBUTES (newdecl)
1715 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1717 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1721 old_result = DECL_TEMPLATE_RESULT (olddecl);
1722 new_result = DECL_TEMPLATE_RESULT (newdecl);
1723 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1724 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1725 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1726 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1728 DECL_ATTRIBUTES (old_result)
1729 = (*targetm.merge_decl_attributes) (old_result, new_result);
1731 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1733 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1734 && DECL_INITIAL (new_result))
1736 if (DECL_INITIAL (old_result))
1737 DECL_UNINLINABLE (old_result) = 1;
1739 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1740 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1741 DECL_NOT_REALLY_EXTERN (old_result)
1742 = DECL_NOT_REALLY_EXTERN (new_result);
1743 DECL_INTERFACE_KNOWN (old_result)
1744 = DECL_INTERFACE_KNOWN (new_result);
1745 DECL_DECLARED_INLINE_P (old_result)
1746 = DECL_DECLARED_INLINE_P (new_result);
1747 DECL_DISREGARD_INLINE_LIMITS (old_result)
1748 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1753 DECL_DECLARED_INLINE_P (old_result)
1754 |= DECL_DECLARED_INLINE_P (new_result);
1755 DECL_DISREGARD_INLINE_LIMITS (old_result)
1756 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1757 check_redeclaration_exception_specification (newdecl, olddecl);
1761 /* If the new declaration is a definition, update the file and
1762 line information on the declaration, and also make
1763 the old declaration the same definition. */
1764 if (DECL_INITIAL (new_result) != NULL_TREE)
1766 DECL_SOURCE_LOCATION (olddecl)
1767 = DECL_SOURCE_LOCATION (old_result)
1768 = DECL_SOURCE_LOCATION (newdecl);
1769 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1770 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1773 DECL_ARGUMENTS (old_result)
1774 = DECL_ARGUMENTS (new_result);
1775 for (parm = DECL_ARGUMENTS (old_result); parm;
1776 parm = DECL_CHAIN (parm))
1777 DECL_CONTEXT (parm) = old_result;
1786 /* Automatically handles default parameters. */
1787 tree oldtype = TREE_TYPE (olddecl);
1790 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1791 maybe_instantiate_noexcept (olddecl);
1793 /* Merge the data types specified in the two decls. */
1794 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1796 /* If merge_types produces a non-typedef type, just use the old type. */
1797 if (TREE_CODE (newdecl) == TYPE_DECL
1798 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1801 if (TREE_CODE (newdecl) == VAR_DECL)
1803 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1804 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1805 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1806 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1807 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1808 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1810 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1811 if (DECL_LANG_SPECIFIC (olddecl)
1812 && CP_DECL_THREADPRIVATE_P (olddecl))
1814 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1815 if (!DECL_LANG_SPECIFIC (newdecl))
1816 retrofit_lang_decl (newdecl);
1818 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1819 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1823 /* Do this after calling `merge_types' so that default
1824 parameters don't confuse us. */
1825 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1826 check_redeclaration_exception_specification (newdecl, olddecl);
1827 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1830 check_default_args (newdecl);
1832 /* Lay the type out, unless already done. */
1833 if (! same_type_p (newtype, oldtype)
1834 && TREE_TYPE (newdecl) != error_mark_node
1835 && !(processing_template_decl && uses_template_parms (newdecl)))
1836 layout_type (TREE_TYPE (newdecl));
1838 if ((TREE_CODE (newdecl) == VAR_DECL
1839 || TREE_CODE (newdecl) == PARM_DECL
1840 || TREE_CODE (newdecl) == RESULT_DECL
1841 || TREE_CODE (newdecl) == FIELD_DECL
1842 || TREE_CODE (newdecl) == TYPE_DECL)
1843 && !(processing_template_decl && uses_template_parms (newdecl)))
1844 layout_decl (newdecl, 0);
1846 /* Merge the type qualifiers. */
1847 if (TREE_READONLY (newdecl))
1848 TREE_READONLY (olddecl) = 1;
1849 if (TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (olddecl) = 1;
1851 if (TREE_NOTHROW (newdecl))
1852 TREE_NOTHROW (olddecl) = 1;
1854 /* Merge deprecatedness. */
1855 if (TREE_DEPRECATED (newdecl))
1856 TREE_DEPRECATED (olddecl) = 1;
1858 /* Preserve function specific target and optimization options */
1859 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1861 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1862 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1863 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1864 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1866 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1867 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1868 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1869 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1872 /* Merge the initialization information. */
1873 if (DECL_INITIAL (newdecl) == NULL_TREE
1874 && DECL_INITIAL (olddecl) != NULL_TREE)
1876 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1877 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1881 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1894 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1895 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1896 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1897 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1898 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1899 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1900 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1901 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1902 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1903 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1904 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1905 /* Keep the old RTL. */
1906 COPY_DECL_RTL (olddecl, newdecl);
1908 else if (TREE_CODE (newdecl) == VAR_DECL
1909 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1911 /* Keep the old RTL. We cannot keep the old RTL if the old
1912 declaration was for an incomplete object and the new
1913 declaration is not since many attributes of the RTL will
1915 COPY_DECL_RTL (olddecl, newdecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1922 /* Clean out any memory we had of the old declaration. */
1923 tree oldstatic = value_member (olddecl, static_aggregates);
1925 TREE_VALUE (oldstatic) = error_mark_node;
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 merge_weak (newdecl, olddecl);
1936 if (DECL_ONE_ONLY (olddecl))
1937 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1939 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1940 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1941 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1942 if (! DECL_EXTERNAL (olddecl))
1943 DECL_EXTERNAL (newdecl) = 0;
1945 new_template_info = NULL_TREE;
1946 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1948 bool new_redefines_gnu_inline = false;
1950 if (new_defines_function
1951 && ((DECL_INTERFACE_KNOWN (olddecl)
1952 && TREE_CODE (olddecl) == FUNCTION_DECL)
1953 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1954 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1955 == FUNCTION_DECL))))
1959 if (TREE_CODE (fn) == TEMPLATE_DECL)
1960 fn = DECL_TEMPLATE_RESULT (olddecl);
1962 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1965 if (!new_redefines_gnu_inline)
1967 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1968 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1969 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1971 DECL_TEMPLATE_INSTANTIATED (newdecl)
1972 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1973 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1975 /* If the OLDDECL is an instantiation and/or specialization,
1976 then the NEWDECL must be too. But, it may not yet be marked
1977 as such if the caller has created NEWDECL, but has not yet
1978 figured out that it is a redeclaration. */
1979 if (!DECL_USE_TEMPLATE (newdecl))
1980 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1982 /* Don't really know how much of the language-specific
1983 values we should copy from old to new. */
1984 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1985 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1986 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1987 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1989 if (LANG_DECL_HAS_MIN (newdecl))
1991 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1992 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1993 if (DECL_TEMPLATE_INFO (newdecl))
1994 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1995 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1997 /* Only functions have these fields. */
1998 if (TREE_CODE (newdecl) == FUNCTION_DECL
1999 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2001 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2002 olddecl_friend = DECL_FRIEND_P (olddecl);
2003 hidden_friend = (DECL_ANTICIPATED (olddecl)
2004 && DECL_HIDDEN_FRIEND_P (olddecl)
2005 && newdecl_is_friend);
2006 DECL_BEFRIENDING_CLASSES (newdecl)
2007 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2008 DECL_BEFRIENDING_CLASSES (olddecl));
2009 /* DECL_THUNKS is only valid for virtual functions,
2010 otherwise it is a DECL_FRIEND_CONTEXT. */
2011 if (DECL_VIRTUAL_P (newdecl))
2012 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2014 /* Only variables have this field. */
2015 else if (TREE_CODE (newdecl) == VAR_DECL
2016 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2017 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2020 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2024 /* Merge parameter attributes. */
2025 tree oldarg, newarg;
2026 for (oldarg = DECL_ARGUMENTS(olddecl),
2027 newarg = DECL_ARGUMENTS(newdecl);
2029 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2030 DECL_ATTRIBUTES (newarg)
2031 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2032 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2035 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2036 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2038 /* If newdecl is not a specialization, then it is not a
2039 template-related function at all. And that means that we
2040 should have exited above, returning 0. */
2041 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2043 if (DECL_ODR_USED (olddecl))
2044 /* From [temp.expl.spec]:
2046 If a template, a member template or the member of a class
2047 template is explicitly specialized then that
2048 specialization shall be declared before the first use of
2049 that specialization that would cause an implicit
2050 instantiation to take place, in every translation unit in
2051 which such a use occurs. */
2052 error ("explicit specialization of %qD after first use",
2055 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2057 /* Don't propagate visibility from the template to the
2058 specialization here. We'll do that in determine_visibility if
2060 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2062 /* [temp.expl.spec/14] We don't inline explicit specialization
2063 just because the primary template says so. */
2065 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2066 the always_inline attribute. */
2067 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2068 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2070 if (DECL_DECLARED_INLINE_P (newdecl))
2071 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2073 DECL_ATTRIBUTES (newdecl)
2074 = remove_attribute ("always_inline",
2075 DECL_ATTRIBUTES (newdecl));
2078 else if (new_defines_function && DECL_INITIAL (olddecl))
2080 /* Never inline re-defined extern inline functions.
2081 FIXME: this could be better handled by keeping both
2082 function as separate declarations. */
2083 DECL_UNINLINABLE (newdecl) = 1;
2087 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2088 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2090 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2092 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2093 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2095 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2096 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2097 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2098 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2101 /* Preserve abstractness on cloned [cd]tors. */
2102 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2104 /* Update newdecl's parms to point at olddecl. */
2105 for (parm = DECL_ARGUMENTS (newdecl); parm;
2106 parm = DECL_CHAIN (parm))
2107 DECL_CONTEXT (parm) = olddecl;
2111 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2112 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2113 COPY_DECL_RTL (newdecl, olddecl);
2115 if (! types_match || new_defines_function)
2117 /* These need to be copied so that the names are available.
2118 Note that if the types do match, we'll preserve inline
2119 info and other bits, but if not, we won't. */
2120 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2121 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2123 if (new_defines_function)
2124 /* If defining a function declared with other language
2125 linkage, use the previously declared language linkage. */
2126 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2127 else if (types_match)
2129 /* If redeclaring a builtin function, and not a definition,
2130 it stays built in. */
2131 if (DECL_BUILT_IN (olddecl))
2133 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2134 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2135 /* If we're keeping the built-in definition, keep the rtl,
2136 regardless of declaration matches. */
2137 COPY_DECL_RTL (olddecl, newdecl);
2138 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2139 switch (DECL_FUNCTION_CODE (newdecl))
2141 /* If a compatible prototype of these builtin functions
2142 is seen, assume the runtime implements it with the
2143 expected semantics. */
2144 case BUILT_IN_STPCPY:
2145 implicit_built_in_decls[DECL_FUNCTION_CODE (newdecl)]
2146 = built_in_decls[DECL_FUNCTION_CODE (newdecl)];
2152 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2153 /* Don't clear out the arguments if we're just redeclaring a
2155 if (DECL_ARGUMENTS (olddecl))
2156 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2159 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2160 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2162 /* Now preserve various other info from the definition. */
2163 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2164 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2165 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2166 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2168 /* Warn about conflicting visibility specifications. */
2169 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2170 && DECL_VISIBILITY_SPECIFIED (newdecl)
2171 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2173 warning_at (input_location, OPT_Wattributes,
2174 "%q+D: visibility attribute ignored because it", newdecl);
2175 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2176 "conflicts with previous declaration here");
2178 /* Choose the declaration which specified visibility. */
2179 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2181 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2182 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2184 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2185 so keep this behavior. */
2186 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2188 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2189 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2191 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2192 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2193 if (TREE_CODE (newdecl) == FIELD_DECL)
2194 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2196 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2197 with that from NEWDECL below. */
2198 if (DECL_LANG_SPECIFIC (olddecl))
2200 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2201 != DECL_LANG_SPECIFIC (newdecl));
2202 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2205 /* Merge the USED information. */
2206 if (TREE_USED (olddecl))
2207 TREE_USED (newdecl) = 1;
2208 else if (TREE_USED (newdecl))
2209 TREE_USED (olddecl) = 1;
2210 if (TREE_CODE (newdecl) == VAR_DECL)
2212 if (DECL_READ_P (olddecl))
2213 DECL_READ_P (newdecl) = 1;
2214 else if (DECL_READ_P (newdecl))
2215 DECL_READ_P (olddecl) = 1;
2217 if (DECL_PRESERVE_P (olddecl))
2218 DECL_PRESERVE_P (newdecl) = 1;
2219 else if (DECL_PRESERVE_P (newdecl))
2220 DECL_PRESERVE_P (olddecl) = 1;
2222 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2226 function_size = sizeof (struct tree_decl_common);
2228 memcpy ((char *) olddecl + sizeof (struct tree_common),
2229 (char *) newdecl + sizeof (struct tree_common),
2230 function_size - sizeof (struct tree_common));
2232 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2233 (char *) newdecl + sizeof (struct tree_decl_common),
2234 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2235 if (new_template_info)
2236 /* If newdecl is a template instantiation, it is possible that
2237 the following sequence of events has occurred:
2239 o A friend function was declared in a class template. The
2240 class template was instantiated.
2242 o The instantiation of the friend declaration was
2243 recorded on the instantiation list, and is newdecl.
2245 o Later, however, instantiate_class_template called pushdecl
2246 on the newdecl to perform name injection. But, pushdecl in
2247 turn called duplicate_decls when it discovered that another
2248 declaration of a global function with the same name already
2251 o Here, in duplicate_decls, we decided to clobber newdecl.
2253 If we're going to do that, we'd better make sure that
2254 olddecl, and not newdecl, is on the list of
2255 instantiations so that if we try to do the instantiation
2256 again we won't get the clobbered declaration. */
2257 reregister_specialization (newdecl,
2263 size_t size = tree_code_size (TREE_CODE (olddecl));
2264 memcpy ((char *) olddecl + sizeof (struct tree_common),
2265 (char *) newdecl + sizeof (struct tree_common),
2266 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2267 switch (TREE_CODE (olddecl))
2277 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2278 (char *) newdecl + sizeof (struct tree_decl_common),
2279 size - sizeof (struct tree_decl_common)
2280 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2284 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2285 (char *) newdecl + sizeof (struct tree_decl_common),
2286 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2287 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2291 DECL_UID (olddecl) = olddecl_uid;
2293 DECL_FRIEND_P (olddecl) = 1;
2296 DECL_ANTICIPATED (olddecl) = 1;
2297 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2300 /* NEWDECL contains the merged attribute lists.
2301 Update OLDDECL to be the same. */
2302 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2304 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2305 so that encode_section_info has a chance to look at the new decl
2306 flags and attributes. */
2307 if (DECL_RTL_SET_P (olddecl)
2308 && (TREE_CODE (olddecl) == FUNCTION_DECL
2309 || (TREE_CODE (olddecl) == VAR_DECL
2310 && TREE_STATIC (olddecl))))
2311 make_decl_rtl (olddecl);
2313 /* The NEWDECL will no longer be needed. Because every out-of-class
2314 declaration of a member results in a call to duplicate_decls,
2315 freeing these nodes represents in a significant savings. */
2321 /* Return zero if the declaration NEWDECL is valid
2322 when the declaration OLDDECL (assumed to be for the same name)
2323 has already been seen.
2324 Otherwise return an error message format string with a %s
2325 where the identifier should go. */
2328 redeclaration_error_message (tree newdecl, tree olddecl)
2330 if (TREE_CODE (newdecl) == TYPE_DECL)
2332 /* Because C++ can put things into name space for free,
2333 constructs like "typedef struct foo { ... } foo"
2334 would look like an erroneous redeclaration. */
2335 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2338 return G_("redefinition of %q#D");
2340 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2342 /* If this is a pure function, its olddecl will actually be
2343 the original initialization to `0' (which we force to call
2344 abort()). Don't complain about redefinition in this case. */
2345 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2346 && DECL_INITIAL (olddecl) == NULL_TREE)
2349 /* If both functions come from different namespaces, this is not
2350 a redeclaration - this is a conflict with a used function. */
2351 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2352 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2353 && ! decls_match (olddecl, newdecl))
2354 return G_("%qD conflicts with used function");
2356 /* We'll complain about linkage mismatches in
2357 warn_extern_redeclared_static. */
2359 /* Defining the same name twice is no good. */
2360 if (DECL_INITIAL (olddecl) != NULL_TREE
2361 && DECL_INITIAL (newdecl) != NULL_TREE)
2363 if (DECL_NAME (olddecl) == NULL_TREE)
2364 return G_("%q#D not declared in class");
2365 else if (!GNU_INLINE_P (olddecl)
2366 || GNU_INLINE_P (newdecl))
2367 return G_("redefinition of %q#D");
2370 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2372 bool olda = GNU_INLINE_P (olddecl);
2373 bool newa = GNU_INLINE_P (newdecl);
2378 return G_("%q+D redeclared inline with "
2379 "%<gnu_inline%> attribute");
2381 return G_("%q+D redeclared inline without "
2382 "%<gnu_inline%> attribute");
2388 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2392 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2394 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2395 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2396 return G_("redefinition of %q#D");
2400 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2401 || (DECL_TEMPLATE_RESULT (newdecl)
2402 == DECL_TEMPLATE_RESULT (olddecl)))
2405 nt = DECL_TEMPLATE_RESULT (newdecl);
2406 if (DECL_TEMPLATE_INFO (nt))
2407 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2408 ot = DECL_TEMPLATE_RESULT (olddecl);
2409 if (DECL_TEMPLATE_INFO (ot))
2410 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2411 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2412 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2413 return G_("redefinition of %q#D");
2415 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2417 bool olda = GNU_INLINE_P (ot);
2418 bool newa = GNU_INLINE_P (nt);
2423 return G_("%q+D redeclared inline with "
2424 "%<gnu_inline%> attribute");
2426 return G_("%q+D redeclared inline without "
2427 "%<gnu_inline%> attribute");
2431 /* Core issue #226 (C++0x):
2433 If a friend function template declaration specifies a
2434 default template-argument, that declaration shall be a
2435 definition and shall be the only declaration of the
2436 function template in the translation unit. */
2437 if ((cxx_dialect != cxx98)
2438 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2439 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2440 /*is_primary=*/1, /*is_partial=*/0,
2441 /*is_friend_decl=*/2))
2442 return G_("redeclaration of friend %q#D "
2443 "may not have default template arguments");
2447 else if (TREE_CODE (newdecl) == VAR_DECL
2448 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2449 && (! DECL_LANG_SPECIFIC (olddecl)
2450 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2451 || DECL_THREAD_LOCAL_P (newdecl)))
2453 /* Only variables can be thread-local, and all declarations must
2454 agree on this property. */
2455 if (DECL_THREAD_LOCAL_P (newdecl))
2456 return G_("thread-local declaration of %q#D follows "
2457 "non-thread-local declaration");
2459 return G_("non-thread-local declaration of %q#D follows "
2460 "thread-local declaration");
2462 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2464 /* The objects have been declared at namespace scope. If either
2465 is a member of an anonymous union, then this is an invalid
2466 redeclaration. For example:
2472 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2473 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2474 return G_("redeclaration of %q#D");
2475 /* If at least one declaration is a reference, there is no
2476 conflict. For example:
2482 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2484 /* Reject two definitions. */
2485 return G_("redefinition of %q#D");
2489 /* Objects declared with block scope: */
2490 /* Reject two definitions, and reject a definition
2491 together with an external reference. */
2492 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2493 return G_("redeclaration of %q#D");
2498 /* Hash and equality functions for the named_label table. */
2501 named_label_entry_hash (const void *data)
2503 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2504 return DECL_UID (ent->label_decl);
2508 named_label_entry_eq (const void *a, const void *b)
2510 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2511 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2512 return ent_a->label_decl == ent_b->label_decl;
2515 /* Create a new label, named ID. */
2518 make_label_decl (tree id, int local_p)
2520 struct named_label_entry *ent;
2524 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2526 DECL_CONTEXT (decl) = current_function_decl;
2527 DECL_MODE (decl) = VOIDmode;
2528 C_DECLARED_LABEL_FLAG (decl) = local_p;
2530 /* Say where one reference is to the label, for the sake of the
2531 error if it is not defined. */
2532 DECL_SOURCE_LOCATION (decl) = input_location;
2534 /* Record the fact that this identifier is bound to this label. */
2535 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2537 /* Create the label htab for the function on demand. */
2539 named_labels = htab_create_ggc (13, named_label_entry_hash,
2540 named_label_entry_eq, NULL);
2542 /* Record this label on the list of labels used in this function.
2543 We do this before calling make_label_decl so that we get the
2544 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2545 ent = ggc_alloc_cleared_named_label_entry ();
2546 ent->label_decl = decl;
2548 slot = htab_find_slot (named_labels, ent, INSERT);
2549 gcc_assert (*slot == NULL);
2555 /* Look for a label named ID in the current function. If one cannot
2556 be found, create one. (We keep track of used, but undefined,
2557 labels, and complain about them at the end of a function.) */
2560 lookup_label_1 (tree id)
2564 /* You can't use labels at global scope. */
2565 if (current_function_decl == NULL_TREE)
2567 error ("label %qE referenced outside of any function", id);
2571 /* See if we've already got this label. */
2572 decl = IDENTIFIER_LABEL_VALUE (id);
2573 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2576 decl = make_label_decl (id, /*local_p=*/0);
2580 /* Wrapper for lookup_label_1. */
2583 lookup_label (tree id)
2586 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2587 ret = lookup_label_1 (id);
2588 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2592 /* Declare a local label named ID. */
2595 declare_local_label (tree id)
2598 cp_label_binding *bind;
2600 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2601 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2602 bind = VEC_safe_push (cp_label_binding, gc,
2603 current_binding_level->shadowed_labels, NULL);
2604 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2606 decl = make_label_decl (id, /*local_p=*/1);
2612 /* Returns nonzero if it is ill-formed to jump past the declaration of
2613 DECL. Returns 2 if it's also a real problem. */
2616 decl_jump_unsafe (tree decl)
2618 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2619 with automatic storage duration is not in scope to a point where it is
2620 in scope is ill-formed unless the variable has scalar type, class type
2621 with a trivial default constructor and a trivial destructor, a
2622 cv-qualified version of one of these types, or an array of one of the
2623 preceding types and is declared without an initializer (8.5). */
2624 tree type = TREE_TYPE (decl);
2626 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2627 || type == error_mark_node)
2630 type = strip_array_types (type);
2632 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2633 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2636 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2642 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2645 identify_goto (tree decl, const location_t *locus)
2648 permerror (input_location, "jump to label %qD", decl);
2650 permerror (input_location, "jump to case label");
2652 permerror (*locus, " from here");
2655 /* Check that a single previously seen jump to a newly defined label
2656 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2657 the jump context; NAMES are the names in scope in LEVEL at the jump
2658 context; LOCUS is the source position of the jump or 0. Returns
2659 true if all is well. */
2662 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2663 bool exited_omp, const location_t *locus)
2665 cp_binding_level *b;
2666 bool identified = false, saw_eh = false, saw_omp = false;
2670 identify_goto (decl, locus);
2671 error (" exits OpenMP structured block");
2672 identified = saw_omp = true;
2675 for (b = current_binding_level; b ; b = b->level_chain)
2677 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2679 for (new_decls = b->names; new_decls != old_decls;
2680 new_decls = DECL_CHAIN (new_decls))
2682 int problem = decl_jump_unsafe (new_decls);
2688 identify_goto (decl, locus);
2692 error (" crosses initialization of %q+#D", new_decls);
2694 permerror (input_location, " enters scope of %q+#D which has "
2695 "non-trivial destructor", new_decls);
2700 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2704 identify_goto (decl, locus);
2707 if (b->kind == sk_try)
2708 error (" enters try block");
2710 error (" enters catch block");
2713 if (b->kind == sk_omp && !saw_omp)
2717 identify_goto (decl, locus);
2720 error (" enters OpenMP structured block");
2729 check_previous_goto (tree decl, struct named_label_use_entry *use)
2731 check_previous_goto_1 (decl, use->binding_level,
2732 use->names_in_scope, use->in_omp_scope,
2733 &use->o_goto_locus);
2737 check_switch_goto (cp_binding_level* level)
2739 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2742 /* Check that a new jump to a label DECL is OK. Called by
2743 finish_goto_stmt. */
2746 check_goto (tree decl)
2748 struct named_label_entry *ent, dummy;
2749 bool saw_catch = false, identified = false;
2753 /* We can't know where a computed goto is jumping.
2754 So we assume that it's OK. */
2755 if (TREE_CODE (decl) != LABEL_DECL)
2758 /* We didn't record any information about this label when we created it,
2759 and there's not much point since it's trivial to analyze as a return. */
2760 if (decl == cdtor_label)
2763 dummy.label_decl = decl;
2764 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2765 gcc_assert (ent != NULL);
2767 /* If the label hasn't been defined yet, defer checking. */
2768 if (! DECL_INITIAL (decl))
2770 struct named_label_use_entry *new_use;
2772 /* Don't bother creating another use if the last goto had the
2773 same data, and will therefore create the same set of errors. */
2775 && ent->uses->names_in_scope == current_binding_level->names)
2778 new_use = ggc_alloc_named_label_use_entry ();
2779 new_use->binding_level = current_binding_level;
2780 new_use->names_in_scope = current_binding_level->names;
2781 new_use->o_goto_locus = input_location;
2782 new_use->in_omp_scope = false;
2784 new_use->next = ent->uses;
2785 ent->uses = new_use;
2789 if (ent->in_try_scope || ent->in_catch_scope
2790 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2792 permerror (input_location, "jump to label %q+D", decl);
2793 permerror (input_location, " from here");
2797 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2799 int u = decl_jump_unsafe (bad);
2801 if (u > 1 && DECL_ARTIFICIAL (bad))
2803 /* Can't skip init of __exception_info. */
2804 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2808 error (" skips initialization of %q+#D", bad);
2810 permerror (input_location, " enters scope of %q+#D which has "
2811 "non-trivial destructor", bad);
2814 if (ent->in_try_scope)
2815 error (" enters try block");
2816 else if (ent->in_catch_scope && !saw_catch)
2817 error (" enters catch block");
2819 if (ent->in_omp_scope)
2820 error (" enters OpenMP structured block");
2821 else if (flag_openmp)
2823 cp_binding_level *b;
2824 for (b = current_binding_level; b ; b = b->level_chain)
2826 if (b == ent->binding_level)
2828 if (b->kind == sk_omp)
2832 permerror (input_location, "jump to label %q+D", decl);
2833 permerror (input_location, " from here");
2836 error (" exits OpenMP structured block");
2843 /* Check that a return is ok wrt OpenMP structured blocks.
2844 Called by finish_return_stmt. Returns true if all is well. */
2847 check_omp_return (void)
2849 cp_binding_level *b;
2850 for (b = current_binding_level; b ; b = b->level_chain)
2851 if (b->kind == sk_omp)
2853 error ("invalid exit from OpenMP structured block");
2856 else if (b->kind == sk_function_parms)
2861 /* Define a label, specifying the location in the source file.
2862 Return the LABEL_DECL node for the label. */
2865 define_label_1 (location_t location, tree name)
2867 struct named_label_entry *ent, dummy;
2868 cp_binding_level *p;
2871 decl = lookup_label (name);
2873 dummy.label_decl = decl;
2874 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2875 gcc_assert (ent != NULL);
2877 /* After labels, make any new cleanups in the function go into their
2878 own new (temporary) binding contour. */
2879 for (p = current_binding_level;
2880 p->kind != sk_function_parms;
2882 p->more_cleanups_ok = 0;
2884 if (name == get_identifier ("wchar_t"))
2885 permerror (input_location, "label named wchar_t");
2887 if (DECL_INITIAL (decl) != NULL_TREE)
2889 error ("duplicate label %qD", decl);
2890 return error_mark_node;
2894 struct named_label_use_entry *use;
2896 /* Mark label as having been defined. */
2897 DECL_INITIAL (decl) = error_mark_node;
2898 /* Say where in the source. */
2899 DECL_SOURCE_LOCATION (decl) = location;
2901 ent->binding_level = current_binding_level;
2902 ent->names_in_scope = current_binding_level->names;
2904 for (use = ent->uses; use ; use = use->next)
2905 check_previous_goto (decl, use);
2912 /* Wrapper for define_label_1. */
2915 define_label (location_t location, tree name)
2918 timevar_start (TV_NAME_LOOKUP);
2919 ret = define_label_1 (location, name);
2920 timevar_stop (TV_NAME_LOOKUP);
2927 cp_binding_level *level;
2928 struct cp_switch *next;
2929 /* The SWITCH_STMT being built. */
2931 /* A splay-tree mapping the low element of a case range to the high
2932 element, or NULL_TREE if there is no high element. Used to
2933 determine whether or not a new case label duplicates an old case
2934 label. We need a tree, rather than simply a hash table, because
2935 of the GNU case range extension. */
2939 /* A stack of the currently active switch statements. The innermost
2940 switch statement is on the top of the stack. There is no need to
2941 mark the stack for garbage collection because it is only active
2942 during the processing of the body of a function, and we never
2943 collect at that point. */
2945 static struct cp_switch *switch_stack;
2947 /* Called right after a switch-statement condition is parsed.
2948 SWITCH_STMT is the switch statement being parsed. */
2951 push_switch (tree switch_stmt)
2953 struct cp_switch *p = XNEW (struct cp_switch);
2954 p->level = current_binding_level;
2955 p->next = switch_stack;
2956 p->switch_stmt = switch_stmt;
2957 p->cases = splay_tree_new (case_compare, NULL, NULL);
2964 struct cp_switch *cs = switch_stack;
2965 location_t switch_location;
2967 /* Emit warnings as needed. */
2968 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2969 if (!processing_template_decl)
2970 c_do_switch_warnings (cs->cases, switch_location,
2971 SWITCH_STMT_TYPE (cs->switch_stmt),
2972 SWITCH_STMT_COND (cs->switch_stmt));
2974 splay_tree_delete (cs->cases);
2975 switch_stack = switch_stack->next;
2979 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
2980 condition. Note that if TYPE and VALUE are already integral we don't
2981 really do the conversion because the language-independent
2982 warning/optimization code will work better that way. */
2985 case_conversion (tree type, tree value)
2987 if (value == NULL_TREE)
2990 if (cxx_dialect >= cxx0x
2991 && (SCOPED_ENUM_P (type)
2992 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
2994 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
2995 type = type_promotes_to (type);
2996 value = perform_implicit_conversion (type, value, tf_warning_or_error);
2998 return cxx_constant_value (value);
3001 /* Note that we've seen a definition of a case label, and complain if this
3002 is a bad place for one. */
3005 finish_case_label (location_t loc, tree low_value, tree high_value)
3008 cp_binding_level *p;
3011 if (processing_template_decl)
3015 /* For templates, just add the case label; we'll do semantic
3016 analysis at instantiation-time. */
3017 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3018 return add_stmt (build_case_label (low_value, high_value, label));
3021 /* Find the condition on which this switch statement depends. */
3022 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3023 if (cond && TREE_CODE (cond) == TREE_LIST)
3024 cond = TREE_VALUE (cond);
3026 if (!check_switch_goto (switch_stack->level))
3027 return error_mark_node;
3029 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3031 low_value = case_conversion (type, low_value);
3032 high_value = case_conversion (type, high_value);
3034 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3035 low_value, high_value);
3037 /* After labels, make any new cleanups in the function go into their
3038 own new (temporary) binding contour. */
3039 for (p = current_binding_level;
3040 p->kind != sk_function_parms;
3042 p->more_cleanups_ok = 0;
3047 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3050 typename_hash (const void* k)
3053 const_tree const t = (const_tree) k;
3055 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3056 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3061 typedef struct typename_info {
3069 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3070 really of type `typename_info*' */
3073 typename_compare (const void * k1, const void * k2)
3075 const_tree const t1 = (const_tree) k1;
3076 const typename_info *const t2 = (const typename_info *) k2;
3078 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3079 && TYPE_CONTEXT (t1) == t2->scope
3080 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3081 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3082 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3085 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3086 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3088 Returns the new TYPENAME_TYPE. */
3090 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3093 build_typename_type (tree context, tree name, tree fullname,
3094 enum tag_types tag_type)
3102 if (typename_htab == NULL)
3103 typename_htab = htab_create_ggc (61, &typename_hash,
3104 &typename_compare, NULL);
3106 ti.scope = FROB_CONTEXT (context);
3108 ti.template_id = fullname;
3109 ti.enum_p = tag_type == enum_type;
3110 ti.class_p = (tag_type == class_type
3111 || tag_type == record_type
3112 || tag_type == union_type);
3113 hash = (htab_hash_pointer (ti.scope)
3114 ^ htab_hash_pointer (ti.name));
3116 /* See if we already have this type. */
3117 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3122 /* Build the TYPENAME_TYPE. */
3123 t = cxx_make_type (TYPENAME_TYPE);
3124 TYPE_CONTEXT (t) = ti.scope;
3125 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3126 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3127 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3129 /* Build the corresponding TYPE_DECL. */
3130 d = build_decl (input_location, TYPE_DECL, name, t);
3131 TYPE_NAME (TREE_TYPE (d)) = d;
3132 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3133 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3134 DECL_ARTIFICIAL (d) = 1;
3136 /* Store it in the hash table. */
3139 /* TYPENAME_TYPEs must always be compared structurally, because
3140 they may or may not resolve down to another type depending on
3141 the currently open classes. */
3142 SET_TYPE_STRUCTURAL_EQUALITY (t);
3148 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3149 provided to name the type. Returns an appropriate type, unless an
3150 error occurs, in which case error_mark_node is returned. If we
3151 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3152 return that, rather than the _TYPE it corresponds to, in other
3153 cases we look through the type decl. If TF_ERROR is set, complain
3154 about errors, otherwise be quiet. */
3157 make_typename_type (tree context, tree name, enum tag_types tag_type,
3158 tsubst_flags_t complain)
3164 if (name == error_mark_node
3165 || context == NULL_TREE
3166 || context == error_mark_node)
3167 return error_mark_node;
3171 if (!(TYPE_LANG_SPECIFIC (name)
3172 && (CLASSTYPE_IS_TEMPLATE (name)
3173 || CLASSTYPE_USE_TEMPLATE (name))))
3174 name = TYPE_IDENTIFIER (name);
3176 /* Create a TEMPLATE_ID_EXPR for the type. */
3177 name = build_nt (TEMPLATE_ID_EXPR,
3178 CLASSTYPE_TI_TEMPLATE (name),
3179 CLASSTYPE_TI_ARGS (name));
3181 else if (TREE_CODE (name) == TYPE_DECL)
3182 name = DECL_NAME (name);
3186 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3188 name = TREE_OPERAND (name, 0);
3189 if (TREE_CODE (name) == TEMPLATE_DECL)
3190 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3191 else if (TREE_CODE (name) == OVERLOAD)
3193 error ("%qD is not a type", name);
3194 return error_mark_node;
3197 if (TREE_CODE (name) == TEMPLATE_DECL)
3199 error ("%qD used without template parameters", name);
3200 return error_mark_node;
3202 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3203 gcc_assert (TYPE_P (context));
3205 if (!MAYBE_CLASS_TYPE_P (context))
3207 if (complain & tf_error)
3208 error ("%q#T is not a class", context);
3209 return error_mark_node;
3212 /* When the CONTEXT is a dependent type, NAME could refer to a
3213 dependent base class of CONTEXT. But look inside it anyway
3214 if CONTEXT is a currently open scope, in case it refers to a
3215 member of the current instantiation or a non-dependent base;
3216 lookup will stop when we hit a dependent base. */
3217 if (!dependent_scope_p (context))
3218 /* We should only set WANT_TYPE when we're a nested typename type.
3219 Then we can give better diagnostics if we find a non-type. */
3220 t = lookup_field (context, name, 2, /*want_type=*/true);
3224 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3225 return build_typename_type (context, name, fullname, tag_type);
3227 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3231 if (complain & tf_error)
3232 error (want_template ? "no class template named %q#T in %q#T"
3233 : "no type named %q#T in %q#T", name, context);
3234 return error_mark_node;
3237 /* Pull out the template from an injected-class-name (or multiple). */
3239 t = maybe_get_template_decl_from_type_decl (t);
3241 if (TREE_CODE (t) == TREE_LIST)
3243 if (complain & tf_error)
3245 error ("lookup of %qT in %qT is ambiguous", name, context);
3246 print_candidates (t);
3248 return error_mark_node;
3251 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3253 if (complain & tf_error)
3254 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3256 return error_mark_node;
3258 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3260 if (complain & tf_error)
3261 error ("%<typename %T::%D%> names %q#T, which is not a type",
3263 return error_mark_node;
3266 if (complain & tf_error)
3267 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3269 /* If we are currently parsing a template and if T is a typedef accessed
3270 through CONTEXT then we need to remember and check access of T at
3271 template instantiation time. */
3272 add_typedef_to_current_template_for_access_check (t, context, input_location);
3275 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3277 /*entering_scope=*/0,
3278 tf_warning_or_error | tf_user);
3280 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3286 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3287 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3288 in which case error_mark_node is returned.
3290 If PARM_LIST is non-NULL, also make sure that the template parameter
3291 list of TEMPLATE_DECL matches.
3293 If COMPLAIN zero, don't complain about any errors that occur. */
3296 make_unbound_class_template (tree context, tree name, tree parm_list,
3297 tsubst_flags_t complain)
3303 name = TYPE_IDENTIFIER (name);
3304 else if (DECL_P (name))
3305 name = DECL_NAME (name);
3306 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3308 if (!dependent_type_p (context)
3309 || currently_open_class (context))
3311 tree tmpl = NULL_TREE;
3313 if (MAYBE_CLASS_TYPE_P (context))
3314 tmpl = lookup_field (context, name, 0, false);
3316 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3317 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3319 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3321 if (complain & tf_error)
3322 error ("no class template named %q#T in %q#T", name, context);
3323 return error_mark_node;
3327 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3329 if (complain & tf_error)
3331 error ("template parameters do not match template");
3332 error ("%q+D declared here", tmpl);
3334 return error_mark_node;
3337 if (complain & tf_error)
3338 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3343 /* Build the UNBOUND_CLASS_TEMPLATE. */
3344 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3345 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3346 TREE_TYPE (t) = NULL_TREE;
3347 SET_TYPE_STRUCTURAL_EQUALITY (t);
3349 /* Build the corresponding TEMPLATE_DECL. */
3350 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3351 TYPE_NAME (TREE_TYPE (d)) = d;
3352 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3353 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3354 DECL_ARTIFICIAL (d) = 1;
3355 DECL_TEMPLATE_PARMS (d) = parm_list;
3362 /* Push the declarations of builtin types into the namespace.
3363 RID_INDEX is the index of the builtin type in the array
3364 RID_POINTERS. NAME is the name used when looking up the builtin
3365 type. TYPE is the _TYPE node for the builtin type. */
3368 record_builtin_type (enum rid rid_index,
3372 tree rname = NULL_TREE, tname = NULL_TREE;
3373 tree tdecl = NULL_TREE;
3375 if ((int) rid_index < (int) RID_MAX)
3376 rname = ridpointers[(int) rid_index];
3378 tname = get_identifier (name);
3380 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3381 eliminated. Built-in types should not be looked up name; their
3382 names are keywords that the parser can recognize. However, there
3383 is code in c-common.c that uses identifier_global_value to look
3384 up built-in types by name. */
3387 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3388 DECL_ARTIFICIAL (tdecl) = 1;
3389 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3395 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3396 DECL_ARTIFICIAL (tdecl) = 1;
3398 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3401 if (!TYPE_NAME (type))
3402 TYPE_NAME (type) = tdecl;
3405 debug_hooks->type_decl (tdecl, 0);
3408 /* Record one of the standard Java types.
3409 * Declare it as having the given NAME.
3410 * If SIZE > 0, it is the size of one of the integral types;
3411 * otherwise it is the negative of the size of one of the other types. */
3414 record_builtin_java_type (const char* name, int size)
3419 type = build_nonstandard_integer_type (size, 0);
3420 type = build_distinct_type_copy (type);
3422 else if (size > -32)
3425 /* "__java_char" or ""__java_boolean". */
3426 type = build_nonstandard_integer_type (-size, 1);
3427 type = build_distinct_type_copy (type);
3428 /* Get the signed type cached and attached to the unsigned type,
3429 so it doesn't get garbage-collected at "random" times,
3430 causing potential codegen differences out of different UIDs
3431 and different alias set numbers. */
3432 stype = build_nonstandard_integer_type (-size, 0);
3433 stype = build_distinct_type_copy (stype);
3434 TREE_CHAIN (type) = stype;
3435 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3438 { /* "__java_float" or ""__java_double". */
3439 type = make_node (REAL_TYPE);
3440 TYPE_PRECISION (type) = - size;
3443 record_builtin_type (RID_MAX, name, type);
3444 decl = TYPE_NAME (type);
3446 /* Suppress generate debug symbol entries for these types,
3447 since for normal C++ they are just clutter.
3448 However, push_lang_context undoes this if extern "Java" is seen. */
3449 DECL_IGNORED_P (decl) = 1;
3451 TYPE_FOR_JAVA (type) = 1;
3455 /* Push a type into the namespace so that the back ends ignore it. */
3458 record_unknown_type (tree type, const char* name)
3460 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3461 TYPE_DECL, get_identifier (name), type));
3462 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3463 DECL_IGNORED_P (decl) = 1;
3464 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3465 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3466 TYPE_ALIGN (type) = 1;
3467 TYPE_USER_ALIGN (type) = 0;
3468 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3471 /* A string for which we should create an IDENTIFIER_NODE at
3474 typedef struct predefined_identifier
3476 /* The name of the identifier. */
3477 const char *const name;
3478 /* The place where the IDENTIFIER_NODE should be stored. */
3480 /* Nonzero if this is the name of a constructor or destructor. */
3481 const int ctor_or_dtor_p;
3482 } predefined_identifier;
3484 /* Create all the predefined identifiers. */
3487 initialize_predefined_identifiers (void)
3489 const predefined_identifier *pid;
3491 /* A table of identifiers to create at startup. */
3492 static const predefined_identifier predefined_identifiers[] = {
3493 { "C++", &lang_name_cplusplus, 0 },
3494 { "C", &lang_name_c, 0 },
3495 { "Java", &lang_name_java, 0 },
3496 /* Some of these names have a trailing space so that it is
3497 impossible for them to conflict with names written by users. */
3498 { "__ct ", &ctor_identifier, 1 },
3499 { "__base_ctor ", &base_ctor_identifier, 1 },
3500 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3501 { "__dt ", &dtor_identifier, 1 },
3502 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3503 { "__base_dtor ", &base_dtor_identifier, 1 },
3504 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3505 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3506 { "nelts", &nelts_identifier, 0 },
3507 { THIS_NAME, &this_identifier, 0 },
3508 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3509 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3510 { "_vptr", &vptr_identifier, 0 },
3511 { "__vtt_parm", &vtt_parm_identifier, 0 },
3512 { "::", &global_scope_name, 0 },
3513 { "std", &std_identifier, 0 },
3517 for (pid = predefined_identifiers; pid->name; ++pid)
3519 *pid->node = get_identifier (pid->name);
3520 if (pid->ctor_or_dtor_p)
3521 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3525 /* Create the predefined scalar types of C,
3526 and some nodes representing standard constants (0, 1, (void *)0).
3527 Initialize the global binding level.
3528 Make definitions for built-in primitive functions. */
3531 cxx_init_decl_processing (void)
3534 tree void_ftype_ptr;
3536 /* Create all the identifiers we need. */
3537 initialize_predefined_identifiers ();
3539 /* Create the global variables. */
3540 push_to_top_level ();
3542 current_function_decl = NULL_TREE;
3543 current_binding_level = NULL;
3544 /* Enter the global namespace. */
3545 gcc_assert (global_namespace == NULL_TREE);
3546 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3548 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3549 TREE_PUBLIC (global_namespace) = 1;
3550 begin_scope (sk_namespace, global_namespace);
3552 if (flag_visibility_ms_compat)
3553 default_visibility = VISIBILITY_HIDDEN;
3556 current_lang_name = lang_name_c;
3558 /* Create the `std' namespace. */
3559 push_namespace (std_identifier);
3560 std_node = current_namespace;
3563 c_common_nodes_and_builtins ();
3565 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3566 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3567 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3568 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3569 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3570 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3571 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3572 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3574 integer_two_node = build_int_cst (NULL_TREE, 2);
3576 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3577 truthvalue_type_node = boolean_type_node;
3578 truthvalue_false_node = boolean_false_node;
3579 truthvalue_true_node = boolean_true_node;
3581 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3582 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3583 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3586 record_builtin_type (RID_MAX, NULL, string_type_node);
3589 delta_type_node = ptrdiff_type_node;
3590 vtable_index_type = ptrdiff_type_node;
3592 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3593 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3594 void_ftype_ptr = build_function_type_list (void_type_node,
3595 ptr_type_node, NULL_TREE);
3597 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3599 /* C++ extensions */
3601 unknown_type_node = make_node (LANG_TYPE);
3602 record_unknown_type (unknown_type_node, "unknown type");
3604 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3605 TREE_TYPE (unknown_type_node) = unknown_type_node;
3607 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3609 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3610 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3612 init_list_type_node = make_node (LANG_TYPE);
3613 record_unknown_type (init_list_type_node, "init list");
3615 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3616 record_unknown_type (dependent_lambda_return_type_node,
3617 "undeduced lambda return type");
3620 /* Make sure we get a unique function type, so we can give
3621 its pointer type a name. (This wins for gdb.) */
3622 tree vfunc_type = make_node (FUNCTION_TYPE);
3623 TREE_TYPE (vfunc_type) = integer_type_node;
3624 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3625 layout_type (vfunc_type);
3627 vtable_entry_type = build_pointer_type (vfunc_type);
3629 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3632 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3633 layout_type (vtbl_type_node);
3634 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3635 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3636 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3637 layout_type (vtbl_ptr_type_node);
3638 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3640 push_namespace (get_identifier ("__cxxabiv1"));
3641 abi_node = current_namespace;
3644 global_type_node = make_node (LANG_TYPE);
3645 record_unknown_type (global_type_node, "global type");
3648 current_lang_name = lang_name_cplusplus;
3652 tree newtype, deltype;
3653 tree ptr_ftype_sizetype;
3657 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3658 if (cxx_dialect == cxx98)
3661 tree bad_alloc_type_node;
3662 tree bad_alloc_decl;
3664 push_namespace (std_identifier);
3665 bad_alloc_id = get_identifier ("bad_alloc");
3666 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3667 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3669 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3670 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3674 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3677 new_eh_spec = noexcept_false_spec;
3679 /* Ensure attribs.c is initialized. */
3682 = build_tree_list (get_identifier ("alloc_size"),
3683 build_tree_list (NULL_TREE, integer_one_node));
3684 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3685 newtype = build_exception_variant (newtype, new_eh_spec);
3686 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3687 push_cp_library_fn (NEW_EXPR, newtype);
3688 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3689 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3690 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3692 nullptr_type_node = make_node (NULLPTR_TYPE);
3693 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3694 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3695 TYPE_UNSIGNED (nullptr_type_node) = 1;
3696 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3697 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3698 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3699 nullptr_node = build_int_cst (nullptr_type_node, 0);
3703 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3705 /* Perform other language dependent initializations. */
3706 init_class_processing ();
3707 init_rtti_processing ();
3708 init_template_processing ();
3710 if (flag_exceptions)
3711 init_exception_processing ();
3713 if (! supports_one_only ())
3716 make_fname_decl = cp_make_fname_decl;
3717 start_fname_decls ();
3719 /* Show we use EH for cleanups. */
3720 if (flag_exceptions)
3721 using_eh_for_cleanups ();
3724 /* Generate an initializer for a function naming variable from
3725 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3726 filled in with the type of the init. */
3729 cp_fname_init (const char* name, tree *type_p)
3731 tree domain = NULL_TREE;
3733 tree init = NULL_TREE;
3738 length = strlen (name);
3739 domain = build_index_type (size_int (length));
3740 init = build_string (length + 1, name);
3743 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3744 type = build_cplus_array_type (type, domain);
3749 TREE_TYPE (init) = type;
3751 init = error_mark_node;
3756 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3757 the decl, LOC is the location to give the decl, NAME is the
3758 initialization string and TYPE_DEP indicates whether NAME depended
3759 on the type of the function. We make use of that to detect
3760 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3761 at the point of first use, so we mustn't push the decl now. */
3764 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3766 const char *const name = (type_dep && processing_template_decl
3767 ? NULL : fname_as_string (type_dep));
3769 tree init = cp_fname_init (name, &type);
3770 tree decl = build_decl (loc, VAR_DECL, id, type);
3773 free (CONST_CAST (char *, name));
3775 /* As we're using pushdecl_with_scope, we must set the context. */
3776 DECL_CONTEXT (decl) = current_function_decl;
3777 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3779 TREE_STATIC (decl) = 1;
3780 TREE_READONLY (decl) = 1;
3781 DECL_ARTIFICIAL (decl) = 1;
3783 TREE_USED (decl) = 1;
3785 if (current_function_decl)
3787 cp_binding_level *b = current_binding_level;
3788 if (b->kind == sk_function_parms)
3789 return error_mark_node;
3790 while (b->level_chain->kind != sk_function_parms)
3792 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3793 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3794 LOOKUP_ONLYCONVERTING);
3798 DECL_THIS_STATIC (decl) = true;
3799 pushdecl_top_level_and_finish (decl, init);
3806 builtin_function_1 (tree decl, tree context, bool is_global)
3808 tree id = DECL_NAME (decl);
3809 const char *name = IDENTIFIER_POINTER (id);
3811 retrofit_lang_decl (decl);
3813 DECL_ARTIFICIAL (decl) = 1;
3814 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3815 SET_DECL_LANGUAGE (decl, lang_c);
3816 /* Runtime library routines are, by definition, available in an
3817 external shared object. */
3818 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3819 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3821 DECL_CONTEXT (decl) = context;
3824 pushdecl_top_level (decl);
3828 /* A function in the user's namespace should have an explicit
3829 declaration before it is used. Mark the built-in function as
3830 anticipated but not actually declared. */
3831 if (name[0] != '_' || name[1] != '_')
3832 DECL_ANTICIPATED (decl) = 1;
3833 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3835 size_t len = strlen (name);
3837 /* Treat __*_chk fortification functions as anticipated as well,
3838 unless they are __builtin_*. */
3839 if (len > strlen ("___chk")
3840 && memcmp (name + len - strlen ("_chk"),
3841 "_chk", strlen ("_chk") + 1) == 0)
3842 DECL_ANTICIPATED (decl) = 1;
3849 cxx_builtin_function (tree decl)
3851 tree id = DECL_NAME (decl);
3852 const char *name = IDENTIFIER_POINTER (id);
3853 /* All builtins that don't begin with an '_' should additionally
3854 go in the 'std' namespace. */
3857 tree decl2 = copy_node(decl);
3858 push_namespace (std_identifier);
3859 builtin_function_1 (decl2, std_node, false);
3863 return builtin_function_1 (decl, NULL_TREE, false);
3866 /* Like cxx_builtin_function, but guarantee the function is added to the global
3867 scope. This is to allow function specific options to add new machine
3868 dependent builtins when the target ISA changes via attribute((target(...)))
3869 which saves space on program startup if the program does not use non-generic
3873 cxx_builtin_function_ext_scope (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, true);
3888 return builtin_function_1 (decl, NULL_TREE, true);
3891 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3892 function. Not called directly. */
3895 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3897 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3898 DECL_EXTERNAL (fn) = 1;
3899 TREE_PUBLIC (fn) = 1;
3900 DECL_ARTIFICIAL (fn) = 1;
3901 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3902 SET_DECL_LANGUAGE (fn, lang_c);
3903 /* Runtime library routines are, by definition, available in an
3904 external shared object. */
3905 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3906 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3910 /* Returns the _DECL for a library function with C linkage.
3911 We assume that such functions never throw; if this is incorrect,
3912 callers should unset TREE_NOTHROW. */
3915 build_library_fn (tree name, tree type)
3917 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3918 TREE_NOTHROW (fn) = 1;
3922 /* Returns the _DECL for a library function with C++ linkage. */
3925 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3927 tree fn = build_library_fn_1 (name, operator_code, type);
3928 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3929 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3930 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3934 /* Like build_library_fn, but takes a C string instead of an
3938 build_library_fn_ptr (const char* name, tree type)
3940 return build_library_fn (get_identifier (name), type);
3943 /* Like build_cp_library_fn, but takes a C string instead of an
3947 build_cp_library_fn_ptr (const char* name, tree type)
3949 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3952 /* Like build_library_fn, but also pushes the function so that we will
3953 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3954 may throw exceptions listed in RAISES. */
3957 push_library_fn (tree name, tree type, tree raises)
3962 type = build_exception_variant (type, raises);
3964 fn = build_library_fn (name, type);
3965 pushdecl_top_level (fn);
3969 /* Like build_cp_library_fn, but also pushes the function so that it
3970 will be found by normal lookup. */
3973 push_cp_library_fn (enum tree_code operator_code, tree type)
3975 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3982 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3986 push_void_library_fn (tree name, tree parmtypes)
3988 tree type = build_function_type (void_type_node, parmtypes);
3989 return push_library_fn (name, type, NULL_TREE);
3992 /* Like push_library_fn, but also note that this function throws
3993 and does not return. Used for __throw_foo and the like. */
3996 push_throw_library_fn (tree name, tree type)
3998 tree fn = push_library_fn (name, type, NULL_TREE);
3999 TREE_THIS_VOLATILE (fn) = 1;
4000 TREE_NOTHROW (fn) = 0;
4004 /* When we call finish_struct for an anonymous union, we create
4005 default copy constructors and such. But, an anonymous union
4006 shouldn't have such things; this function undoes the damage to the
4007 anonymous union type T.
4009 (The reason that we create the synthesized methods is that we don't
4010 distinguish `union { int i; }' from `typedef union { int i; } U'.
4011 The first is an anonymous union; the second is just an ordinary
4015 fixup_anonymous_aggr (tree t)
4019 /* Wipe out memory of synthesized methods. */
4020 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4021 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4022 TYPE_HAS_COPY_CTOR (t) = 0;
4023 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4024 TYPE_HAS_COPY_ASSIGN (t) = 0;
4025 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4027 /* Splice the implicitly generated functions out of the TYPE_METHODS
4029 q = &TYPE_METHODS (t);
4032 if (DECL_ARTIFICIAL (*q))
4033 *q = TREE_CHAIN (*q);
4035 q = &DECL_CHAIN (*q);
4038 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4039 if (TYPE_METHODS (t))
4041 tree decl = TYPE_MAIN_DECL (t);
4043 if (TREE_CODE (t) != UNION_TYPE)
4044 error_at (DECL_SOURCE_LOCATION (decl),
4045 "an anonymous struct cannot have function members");
4047 error_at (DECL_SOURCE_LOCATION (decl),
4048 "an anonymous union cannot have function members");
4051 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4052 assignment operators (because they cannot have these methods themselves).
4053 For anonymous unions this is already checked because they are not allowed
4054 in any union, otherwise we have to check it. */
4055 if (TREE_CODE (t) != UNION_TYPE)
4059 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4060 if (TREE_CODE (field) == FIELD_DECL)
4062 type = TREE_TYPE (field);
4063 if (CLASS_TYPE_P (type))
4065 if (TYPE_NEEDS_CONSTRUCTING (type))
4066 error ("member %q+#D with constructor not allowed "
4067 "in anonymous aggregate", field);
4068 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4069 error ("member %q+#D with destructor not allowed "
4070 "in anonymous aggregate", field);
4071 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4072 error ("member %q+#D with copy assignment operator "
4073 "not allowed in anonymous aggregate", field);
4079 /* Make sure that a declaration with no declarator is well-formed, i.e.
4080 just declares a tagged type or anonymous union.
4082 Returns the type declared; or NULL_TREE if none. */
4085 check_tag_decl (cp_decl_specifier_seq *declspecs)
4087 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4088 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4089 /* If a class, struct, or enum type is declared by the DECLSPECS
4090 (i.e, if a class-specifier, enum-specifier, or non-typename
4091 elaborated-type-specifier appears in the DECLSPECS),
4092 DECLARED_TYPE is set to the corresponding type. */
4093 tree declared_type = NULL_TREE;
4094 bool error_p = false;
4096 if (declspecs->multiple_types_p)
4097 error ("multiple types in one declaration");
4098 else if (declspecs->redefined_builtin_type)
4100 if (!in_system_header)
4101 permerror (input_location, "redeclaration of C++ built-in type %qT",
4102 declspecs->redefined_builtin_type);
4107 && TYPE_P (declspecs->type)
4108 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4109 && MAYBE_CLASS_TYPE_P (declspecs->type))
4110 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4111 declared_type = declspecs->type;
4112 else if (declspecs->type == error_mark_node)
4114 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4115 permerror (input_location, "declaration does not declare anything");
4116 /* Check for an anonymous union. */
4117 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4118 && TYPE_ANONYMOUS_P (declared_type))
4120 /* 7/3 In a simple-declaration, the optional init-declarator-list
4121 can be omitted only when declaring a class (clause 9) or
4122 enumeration (7.2), that is, when the decl-specifier-seq contains
4123 either a class-specifier, an elaborated-type-specifier with
4124 a class-key (9.1), or an enum-specifier. In these cases and
4125 whenever a class-specifier or enum-specifier is present in the
4126 decl-specifier-seq, the identifiers in these specifiers are among
4127 the names being declared by the declaration (as class-name,
4128 enum-names, or enumerators, depending on the syntax). In such
4129 cases, and except for the declaration of an unnamed bit-field (9.6),
4130 the decl-specifier-seq shall introduce one or more names into the
4131 program, or shall redeclare a name introduced by a previous
4132 declaration. [Example:
4133 enum { }; // ill-formed
4134 typedef class { }; // ill-formed
4138 error ("missing type-name in typedef-declaration");
4141 /* Anonymous unions are objects, so they can have specifiers. */;
4142 SET_ANON_AGGR_TYPE_P (declared_type);
4144 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4145 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4150 if (declspecs->specs[(int)ds_inline]
4151 || declspecs->specs[(int)ds_virtual])
4152 error ("%qs can only be specified for functions",
4153 declspecs->specs[(int)ds_inline]
4154 ? "inline" : "virtual");
4156 && (!current_class_type
4157 || current_scope () != current_class_type))
4158 error ("%<friend%> can only be specified inside a class");
4159 else if (declspecs->specs[(int)ds_explicit])
4160 error ("%<explicit%> can only be specified for constructors");
4161 else if (declspecs->storage_class)
4162 error ("a storage class can only be specified for objects "
4164 else if (declspecs->specs[(int)ds_const]
4165 || declspecs->specs[(int)ds_volatile]
4166 || declspecs->specs[(int)ds_restrict]
4167 || declspecs->specs[(int)ds_thread])
4168 error ("qualifiers can only be specified for objects "
4170 else if (saw_typedef)
4171 warning (0, "%<typedef%> was ignored in this declaration");
4172 else if (declspecs->specs[(int) ds_constexpr])
4173 error ("%<constexpr%> cannot be used for type declarations");
4176 return declared_type;
4179 /* Called when a declaration is seen that contains no names to declare.
4180 If its type is a reference to a structure, union or enum inherited
4181 from a containing scope, shadow that tag name for the current scope
4182 with a forward reference.
4183 If its type defines a new named structure or union
4184 or defines an enum, it is valid but we need not do anything here.
4185 Otherwise, it is an error.
4187 C++: may have to grok the declspecs to learn about static,
4188 complain for anonymous unions.
4190 Returns the TYPE declared -- or NULL_TREE if none. */
4193 shadow_tag (cp_decl_specifier_seq *declspecs)
4195 tree t = check_tag_decl (declspecs);
4200 if (declspecs->attributes)
4202 warning (0, "attribute ignored in declaration of %q+#T", t);
4203 warning (0, "attribute for %q+#T must follow the %qs keyword",
4204 t, class_key_or_enum_as_string (t));
4208 if (maybe_process_partial_specialization (t) == error_mark_node)
4211 /* This is where the variables in an anonymous union are
4212 declared. An anonymous union declaration looks like:
4214 because there is no declarator after the union, the parser
4215 sends that declaration here. */
4216 if (ANON_AGGR_TYPE_P (t))
4218 fixup_anonymous_aggr (t);
4220 if (TYPE_FIELDS (t))
4222 tree decl = grokdeclarator (/*declarator=*/NULL,
4223 declspecs, NORMAL, 0, NULL);
4224 finish_anon_union (decl);
4231 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4234 groktypename (cp_decl_specifier_seq *type_specifiers,
4235 const cp_declarator *declarator,
4236 bool is_template_arg)
4240 enum decl_context context
4241 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4242 attrs = type_specifiers->attributes;
4243 type_specifiers->attributes = NULL_TREE;
4244 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4245 if (attrs && type != error_mark_node)
4247 if (CLASS_TYPE_P (type))
4248 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4249 "outside of definition", type);
4250 else if (MAYBE_CLASS_TYPE_P (type))
4251 /* A template type parameter or other dependent type. */
4252 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4253 "type %qT without an associated declaration", type);
4255 cplus_decl_attributes (&type, attrs, 0);
4260 /* Process a DECLARATOR for a function-scope variable declaration,
4261 namespace-scope variable declaration, or function declaration.
4262 (Function definitions go through start_function; class member
4263 declarations appearing in the body of the class go through
4264 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4265 If an error occurs, the error_mark_node is returned instead.
4267 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4268 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4269 for an explicitly defaulted function, or SD_DELETED for an explicitly
4270 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4271 implicitly initialized via a default constructor. ATTRIBUTES and
4272 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4273 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4274 set, the caller is responsible for calling pop_scope. */
4277 start_decl (const cp_declarator *declarator,
4278 cp_decl_specifier_seq *declspecs,
4281 tree prefix_attributes,
4282 tree *pushed_scope_p)
4290 *pushed_scope_p = NULL_TREE;
4292 /* An object declared as __attribute__((deprecated)) suppresses
4293 warnings of uses of other deprecated items. */
4294 if (lookup_attribute ("deprecated", attributes))
4295 deprecated_state = DEPRECATED_SUPPRESS;
4297 attributes = chainon (attributes, prefix_attributes);
4299 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4302 deprecated_state = DEPRECATED_NORMAL;
4304 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4305 || decl == error_mark_node)
4306 return error_mark_node;
4308 context = CP_DECL_CONTEXT (decl);
4309 if (context != global_namespace)
4310 *pushed_scope_p = push_scope (context);
4313 /* Is it valid for this decl to have an initializer at all?
4314 If not, set INITIALIZED to zero, which will indirectly
4315 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4316 switch (TREE_CODE (decl))
4319 error ("typedef %qD is initialized (use decltype instead)", decl);
4320 return error_mark_node;
4323 if (initialized == SD_DELETED)
4324 /* We'll handle the rest of the semantics later, but we need to
4325 set this now so it's visible to duplicate_decls. */
4326 DECL_DELETED_FN (decl) = 1;
4335 if (! toplevel_bindings_p ()
4336 && DECL_EXTERNAL (decl))
4337 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4339 DECL_EXTERNAL (decl) = 0;
4340 if (toplevel_bindings_p ())
4341 TREE_STATIC (decl) = 1;
4343 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4345 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4346 record_key_method_defined (decl);
4348 /* If this is a typedef that names the class for linkage purposes
4349 (7.1.3p8), apply any attributes directly to the type. */
4350 if (TREE_CODE (decl) == TYPE_DECL
4351 && TAGGED_TYPE_P (TREE_TYPE (decl))
4352 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4353 flags = ATTR_FLAG_TYPE_IN_PLACE;
4357 /* Set attributes here so if duplicate decl, will have proper attributes. */
4358 cplus_decl_attributes (&decl, attributes, flags);
4360 /* Dllimported symbols cannot be defined. Static data members (which
4361 can be initialized in-class and dllimported) go through grokfield,
4362 not here, so we don't need to exclude those decls when checking for
4364 if (initialized && DECL_DLLIMPORT_P (decl))
4366 error ("definition of %q#D is marked %<dllimport%>", decl);
4367 DECL_DLLIMPORT_P (decl) = 0;
4370 /* If #pragma weak was used, mark the decl weak now. */
4371 maybe_apply_pragma_weak (decl);
4373 if (TREE_CODE (decl) == FUNCTION_DECL
4374 && DECL_DECLARED_INLINE_P (decl)
4375 && DECL_UNINLINABLE (decl)
4376 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4377 warning (0, "inline function %q+D given attribute noinline", decl);
4379 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4381 if (TREE_CODE (decl) == VAR_DECL)
4383 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4384 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4385 error ("%q#D is not a static member of %q#T", decl, context);
4388 if (DECL_CONTEXT (field) != context)
4390 if (!same_type_p (DECL_CONTEXT (field), context))
4391 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4392 "to be defined as %<%T::%D%>",
4393 DECL_CONTEXT (field), DECL_NAME (decl),
4394 context, DECL_NAME (decl));
4395 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4397 if (processing_specialization
4398 && template_class_depth (context) == 0
4399 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4400 error ("template header not allowed in member definition "
4401 "of explicitly specialized class");
4402 /* Static data member are tricky; an in-class initialization
4403 still doesn't provide a definition, so the in-class
4404 declaration will have DECL_EXTERNAL set, but will have an
4405 initialization. Thus, duplicate_decls won't warn
4406 about this situation, and so we check here. */
4407 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4408 error ("duplicate initialization of %qD", decl);
4409 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4411 if (declspecs->specs[(int) ds_constexpr]
4412 && !DECL_DECLARED_CONSTEXPR_P (field))
4413 error ("%qD declared %<constexpr%> outside its class", field);
4418 tree field = check_classfn (context, decl,
4419 (processing_template_decl
4420 > template_class_depth (context))
4421 ? current_template_parms
4423 if (field && field != error_mark_node
4424 && duplicate_decls (decl, field,
4425 /*newdecl_is_friend=*/false))
4429 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4430 DECL_IN_AGGR_P (decl) = 0;
4431 /* Do not mark DECL as an explicit specialization if it was not
4432 already marked as an instantiation; a declaration should
4433 never be marked as a specialization unless we know what
4434 template is being specialized. */
4435 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4437 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4439 /* [temp.expl.spec] An explicit specialization of a static data
4440 member of a template is a definition if the declaration
4441 includes an initializer; otherwise, it is a declaration.
4443 We check for processing_specialization so this only applies
4444 to the new specialization syntax. */
4445 if (!initialized && processing_specialization)
4446 DECL_EXTERNAL (decl) = 1;
4449 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4450 /* Aliases are definitions. */
4452 permerror (input_location, "declaration of %q#D outside of class is not definition",
4456 was_public = TREE_PUBLIC (decl);
4458 /* Enter this declaration into the symbol table. */
4459 decl = maybe_push_decl (decl);
4461 if (processing_template_decl)
4462 decl = push_template_decl (decl);
4463 if (decl == error_mark_node)
4464 return error_mark_node;
4466 /* Tell the back end to use or not use .common as appropriate. If we say
4467 -fconserve-space, we want this to save .data space, at the expense of
4468 wrong semantics. If we say -fno-conserve-space, we want this to
4469 produce errors about redefs; to do this we force variables into the
4471 if (flag_conserve_space
4472 && TREE_CODE (decl) == VAR_DECL
4473 && TREE_PUBLIC (decl)
4474 && !DECL_THREAD_LOCAL_P (decl)
4475 && !have_global_bss_p ())
4476 DECL_COMMON (decl) = 1;
4478 if (TREE_CODE (decl) == VAR_DECL
4479 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4480 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4482 /* This is a const variable with implicit 'static'. Set
4483 DECL_THIS_STATIC so we can tell it from variables that are
4484 !TREE_PUBLIC because of the anonymous namespace. */
4485 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4486 DECL_THIS_STATIC (decl) = 1;
4489 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4490 start_decl_1 (decl, initialized);
4495 /* Process the declaration of a variable DECL. INITIALIZED is true
4496 iff DECL is explicitly initialized. (INITIALIZED is false if the
4497 variable is initialized via an implicitly-called constructor.)
4498 This function must be called for ordinary variables (including, for
4499 example, implicit instantiations of templates), but must not be
4500 called for template declarations. */
4503 start_decl_1 (tree decl, bool initialized)
4507 bool aggregate_definition_p;
4509 gcc_assert (!processing_template_decl);
4511 if (error_operand_p (decl))
4514 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4516 type = TREE_TYPE (decl);
4517 complete_p = COMPLETE_TYPE_P (type);
4518 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4520 /* If an explicit initializer is present, or if this is a definition
4521 of an aggregate, then we need a complete type at this point.
4522 (Scalars are always complete types, so there is nothing to
4523 check.) This code just sets COMPLETE_P; errors (if necessary)
4524 are issued below. */
4525 if ((initialized || aggregate_definition_p)
4527 && COMPLETE_TYPE_P (complete_type (type)))
4530 /* We will not yet have set TREE_READONLY on DECL if the type
4531 was "const", but incomplete, before this point. But, now, we
4532 have a complete type, so we can try again. */
4533 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4537 /* Is it valid for this decl to have an initializer at all? */
4539 /* Don't allow initializations for incomplete types except for
4540 arrays which might be completed by the initialization. */
4542 ; /* A complete type is ok. */
4543 else if (type_uses_auto (type))
4544 ; /* An auto type is ok. */
4545 else if (TREE_CODE (type) != ARRAY_TYPE)
4547 error ("variable %q#D has initializer but incomplete type", decl);
4548 type = TREE_TYPE (decl) = error_mark_node;
4550 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4552 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4553 error ("elements of array %q#D have incomplete type", decl);
4554 /* else we already gave an error in start_decl. */
4557 else if (aggregate_definition_p && !complete_p)
4559 if (type_uses_auto (type))
4560 error ("declaration of %q#D has no initializer", decl);
4562 error ("aggregate %q#D has incomplete type and cannot be defined",
4564 /* Change the type so that assemble_variable will give
4565 DECL an rtl we can live with: (mem (const_int 0)). */
4566 type = TREE_TYPE (decl) = error_mark_node;
4569 /* Create a new scope to hold this declaration if necessary.
4570 Whether or not a new scope is necessary cannot be determined
4571 until after the type has been completed; if the type is a
4572 specialization of a class template it is not until after
4573 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4574 will be set correctly. */
4575 maybe_push_cleanup_level (type);
4578 /* Handle initialization of references. DECL, TYPE, and INIT have the
4579 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4580 but will be set to a new CLEANUP_STMT if a temporary is created
4581 that must be destroyed subsequently.
4583 Returns an initializer expression to use to initialize DECL, or
4584 NULL if the initialization can be performed statically.
4586 Quotes on semantics can be found in ARM 8.4.3. */
4589 grok_reference_init (tree decl, tree type, tree init, tree *cleanup,
4594 if (init == NULL_TREE)
4596 if ((DECL_LANG_SPECIFIC (decl) == 0
4597 || DECL_IN_AGGR_P (decl) == 0)
4598 && ! DECL_THIS_EXTERN (decl))
4599 error ("%qD declared as reference but not initialized", decl);
4603 if (TREE_CODE (init) == TREE_LIST)
4604 init = build_x_compound_expr_from_list (init, ELK_INIT,
4605 tf_warning_or_error);
4607 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4608 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4609 /* Note: default conversion is only called in very special cases. */
4610 init = decay_conversion (init);
4612 /* Convert INIT to the reference type TYPE. This may involve the
4613 creation of a temporary, whose lifetime must be the same as that
4614 of the reference. If so, a DECL_EXPR for the temporary will be
4615 added just after the DECL_EXPR for DECL. That's why we don't set
4616 DECL_INITIAL for local references (instead assigning to them
4617 explicitly); we need to allow the temporary to be initialized
4619 tmp = initialize_reference (type, init, decl, cleanup, flags,
4620 tf_warning_or_error);
4621 if (DECL_DECLARED_CONSTEXPR_P (decl))
4623 tmp = cxx_constant_value (tmp);
4624 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
4625 = reduced_constant_expression_p (tmp);
4628 if (tmp == error_mark_node)
4630 else if (tmp == NULL_TREE)
4632 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4636 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4639 DECL_INITIAL (decl) = tmp;
4644 /* Subroutine of check_initializer. We're initializing a DECL of
4645 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4646 extend the lifetime of the underlying array to match that of the decl,
4647 just like for reference initialization. CLEANUP is as for
4648 grok_reference_init. */
4651 build_init_list_var_init (tree decl, tree type, tree init, tree *array_init,
4654 tree aggr_init, array, arrtype;
4655 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4656 if (error_operand_p (init))
4657 return error_mark_node;
4659 aggr_init = TARGET_EXPR_INITIAL (init);
4660 array = CONSTRUCTOR_ELT (aggr_init, 0)->value;
4661 arrtype = TREE_TYPE (array);
4663 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4664 array = TREE_OPERAND (array, 0);
4665 /* If the array is constant, finish_compound_literal already made it a
4666 static variable and we don't need to do anything here. */
4667 if (decl && TREE_CODE (array) == TARGET_EXPR)
4669 tree var = set_up_extended_ref_temp (decl, array, cleanup, array_init);
4670 var = build_address (var);
4671 var = convert (arrtype, var);
4672 CONSTRUCTOR_ELT (aggr_init, 0)->value = var;
4677 /* Designated initializers in arrays are not supported in GNU C++.
4678 The parser cannot detect this error since it does not know whether
4679 a given brace-enclosed initializer is for a class type or for an
4680 array. This function checks that CE does not use a designated
4681 initializer. If it does, an error is issued. Returns true if CE
4682 is valid, i.e., does not have a designated initializer. */
4685 check_array_designated_initializer (const constructor_elt *ce,
4686 unsigned HOST_WIDE_INT index)
4688 /* Designated initializers for array elements are not supported. */
4691 /* The parser only allows identifiers as designated
4693 if (ce->index == error_mark_node)
4694 error ("name used in a GNU-style designated "
4695 "initializer for an array");
4696 else if (TREE_CODE (ce->index) == INTEGER_CST)
4698 /* A C99 designator is OK if it matches the current index. */
4699 if (TREE_INT_CST_LOW (ce->index) == index)
4702 sorry ("non-trivial designated initializers not supported");
4706 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4707 error ("name %qD used in a GNU-style designated "
4708 "initializer for an array", ce->index);
4716 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4717 array until we finish parsing the initializer. If that's the
4718 situation we're in, update DECL accordingly. */
4721 maybe_deduce_size_from_array_init (tree decl, tree init)
4723 tree type = TREE_TYPE (decl);
4725 if (TREE_CODE (type) == ARRAY_TYPE
4726 && TYPE_DOMAIN (type) == NULL_TREE
4727 && TREE_CODE (decl) != TYPE_DECL)
4729 /* do_default is really a C-ism to deal with tentative definitions.
4730 But let's leave it here to ease the eventual merge. */
4731 int do_default = !DECL_EXTERNAL (decl);
4732 tree initializer = init ? init : DECL_INITIAL (decl);
4735 /* Check that there are no designated initializers in INIT, as
4736 those are not supported in GNU C++, and as the middle-end
4737 will crash if presented with a non-numeric designated
4739 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4741 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4742 constructor_elt *ce;
4744 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4745 if (!check_array_designated_initializer (ce, i))
4751 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4755 error ("initializer fails to determine size of %qD", decl);
4756 TREE_TYPE (decl) = error_mark_node;
4758 else if (failure == 2)
4762 error ("array size missing in %qD", decl);
4763 TREE_TYPE (decl) = error_mark_node;
4765 /* If a `static' var's size isn't known, make it extern as
4766 well as static, so it does not get allocated. If it's not
4767 `static', then don't mark it extern; finish_incomplete_decl
4768 will give it a default size and it will get allocated. */
4769 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4770 DECL_EXTERNAL (decl) = 1;
4772 else if (failure == 3)
4774 error ("zero-size array %qD", decl);
4775 TREE_TYPE (decl) = error_mark_node;
4779 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4781 relayout_decl (decl);
4785 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4786 any appropriate error messages regarding the layout. */
4789 layout_var_decl (tree decl)
4793 type = TREE_TYPE (decl);
4794 if (type == error_mark_node)
4797 /* If we haven't already layed out this declaration, do so now.
4798 Note that we must not call complete type for an external object
4799 because it's type might involve templates that we are not
4800 supposed to instantiate yet. (And it's perfectly valid to say
4801 `extern X x' for some incomplete type `X'.) */
4802 if (!DECL_EXTERNAL (decl))
4803 complete_type (type);
4804 if (!DECL_SIZE (decl)
4805 && TREE_TYPE (decl) != error_mark_node
4806 && (COMPLETE_TYPE_P (type)
4807 || (TREE_CODE (type) == ARRAY_TYPE
4808 && !TYPE_DOMAIN (type)
4809 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4810 layout_decl (decl, 0);
4812 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4814 /* An automatic variable with an incomplete type: that is an error.
4815 Don't talk about array types here, since we took care of that
4816 message in grokdeclarator. */
4817 error ("storage size of %qD isn%'t known", decl);
4818 TREE_TYPE (decl) = error_mark_node;
4821 /* Keep this code around in case we later want to control debug info
4822 based on whether a type is "used". (jason 1999-11-11) */
4824 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4825 /* Let debugger know it should output info for this type. */
4826 note_debug_info_needed (ttype);
4828 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4829 note_debug_info_needed (DECL_CONTEXT (decl));
4832 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4833 && DECL_SIZE (decl) != NULL_TREE
4834 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4836 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4837 constant_expression_warning (DECL_SIZE (decl));
4840 error ("storage size of %qD isn%'t constant", decl);
4841 TREE_TYPE (decl) = error_mark_node;
4846 /* If a local static variable is declared in an inline function, or if
4847 we have a weak definition, we must endeavor to create only one
4848 instance of the variable at link-time. */
4851 maybe_commonize_var (tree decl)
4853 /* Static data in a function with comdat linkage also has comdat
4855 if (TREE_STATIC (decl)
4856 /* Don't mess with __FUNCTION__. */
4857 && ! DECL_ARTIFICIAL (decl)
4858 && DECL_FUNCTION_SCOPE_P (decl)
4859 && vague_linkage_p (DECL_CONTEXT (decl)))
4863 /* With weak symbols, we simply make the variable COMDAT;
4864 that will cause copies in multiple translations units to
4866 comdat_linkage (decl);
4870 if (DECL_INITIAL (decl) == NULL_TREE
4871 || DECL_INITIAL (decl) == error_mark_node)
4873 /* Without weak symbols, we can use COMMON to merge
4874 uninitialized variables. */
4875 TREE_PUBLIC (decl) = 1;
4876 DECL_COMMON (decl) = 1;
4880 /* While for initialized variables, we must use internal
4881 linkage -- which means that multiple copies will not
4883 TREE_PUBLIC (decl) = 0;
4884 DECL_COMMON (decl) = 0;
4885 warning_at (input_location, 0,
4886 "sorry: semantics of inline function static "
4887 "data %q+#D are wrong (you%'ll wind up "
4888 "with multiple copies)", decl);
4889 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4890 " you can work around this by removing "
4895 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4896 /* Set it up again; we might have set DECL_INITIAL since the last
4898 comdat_linkage (decl);
4901 /* Issue an error message if DECL is an uninitialized const variable. */
4904 check_for_uninitialized_const_var (tree decl)
4906 tree type = strip_array_types (TREE_TYPE (decl));
4908 /* ``Unless explicitly declared extern, a const object does not have
4909 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4911 if (TREE_CODE (decl) == VAR_DECL
4912 && TREE_CODE (type) != REFERENCE_TYPE
4913 && CP_TYPE_CONST_P (type)
4914 && !DECL_INITIAL (decl))
4916 tree field = default_init_uninitialized_part (type);
4920 permerror (DECL_SOURCE_LOCATION (decl),
4921 "uninitialized const %qD", decl);
4923 if (CLASS_TYPE_P (type))
4925 tree defaulted_ctor;
4927 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4928 "%q#T has no user-provided default constructor", type);
4929 defaulted_ctor = in_class_defaulted_default_constructor (type);
4931 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4932 "constructor is not user-provided because it is "
4933 "explicitly defaulted in the class body");
4934 inform (0, "and the implicitly-defined constructor does not "
4935 "initialize %q+#D", field);
4940 /* Structure holding the current initializer being processed by reshape_init.
4941 CUR is a pointer to the current element being processed, END is a pointer
4942 after the last element present in the initializer. */
4943 typedef struct reshape_iterator_t
4945 constructor_elt *cur;
4946 constructor_elt *end;
4949 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4951 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4952 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4953 initialized. If there are no more such fields, the return value
4957 next_initializable_field (tree field)
4960 && (TREE_CODE (field) != FIELD_DECL
4961 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4962 || DECL_ARTIFICIAL (field)))
4963 field = DECL_CHAIN (field);
4968 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4969 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4970 INTEGER_CST representing the size of the array minus one (the maximum index),
4971 or NULL_TREE if the array was declared without specifying the size. D is
4972 the iterator within the constructor. */
4975 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4976 tsubst_flags_t complain)
4979 bool sized_array_p = (max_index != NULL_TREE);
4980 unsigned HOST_WIDE_INT max_index_cst = 0;
4981 unsigned HOST_WIDE_INT index;
4983 /* The initializer for an array is always a CONSTRUCTOR. */
4984 new_init = build_constructor (init_list_type_node, NULL);
4988 /* Minus 1 is used for zero sized arrays. */
4989 if (integer_all_onesp (max_index))
4992 if (host_integerp (max_index, 1))
4993 max_index_cst = tree_low_cst (max_index, 1);
4994 /* sizetype is sign extended, not zero extended. */
4996 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
5000 /* Loop until there are no more initializers. */
5002 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
5007 check_array_designated_initializer (d->cur, index);
5008 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
5010 if (elt_init == error_mark_node)
5011 return error_mark_node;
5012 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
5013 size_int (index), elt_init);
5014 if (!TREE_CONSTANT (elt_init))
5015 TREE_CONSTANT (new_init) = false;
5021 /* Subroutine of reshape_init_r, processes the initializers for arrays.
5022 Parameters are the same of reshape_init_r. */
5025 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5027 tree max_index = NULL_TREE;
5029 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5031 if (TYPE_DOMAIN (type))
5032 max_index = array_type_nelts (type);
5034 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5037 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5038 Parameters are the same of reshape_init_r. */
5041 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5043 tree max_index = NULL_TREE;
5045 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5047 if (COMPOUND_LITERAL_P (d->cur->value))
5049 tree value = d->cur->value;
5050 if (!same_type_p (TREE_TYPE (value), type))
5052 if (complain & tf_error)
5053 error ("invalid type %qT as initializer for a vector of type %qT",
5054 TREE_TYPE (d->cur->value), type);
5055 value = error_mark_node;
5061 /* For a vector, we initialize it as an array of the appropriate size. */
5062 if (TREE_CODE (type) == VECTOR_TYPE)
5063 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5065 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5068 /* Subroutine of reshape_init_r, processes the initializers for classes
5069 or union. Parameters are the same of reshape_init_r. */
5072 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5073 tsubst_flags_t complain)
5078 gcc_assert (CLASS_TYPE_P (type));
5080 /* The initializer for a class is always a CONSTRUCTOR. */
5081 new_init = build_constructor (init_list_type_node, NULL);
5082 field = next_initializable_field (TYPE_FIELDS (type));
5088 An initializer for an aggregate member that is an
5089 empty class shall have the form of an empty
5090 initializer-list {}. */
5091 if (!first_initializer_p)
5093 if (complain & tf_error)
5094 error ("initializer for %qT must be brace-enclosed", type);
5095 return error_mark_node;
5100 /* Loop through the initializable fields, gathering initializers. */
5101 while (d->cur != d->end)
5105 /* Handle designated initializers, as an extension. */
5108 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5110 if (!field || TREE_CODE (field) != FIELD_DECL)
5112 if (complain & tf_error)
5113 error ("%qT has no non-static data member named %qD", type,
5115 return error_mark_node;
5119 /* If we processed all the member of the class, we are done. */
5123 field_init = reshape_init_r (TREE_TYPE (field), d,
5124 /*first_initializer_p=*/false, complain);
5125 if (field_init == error_mark_node)
5126 return error_mark_node;
5128 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5132 When a union is initialized with a brace-enclosed
5133 initializer, the braces shall only contain an
5134 initializer for the first member of the union. */
5135 if (TREE_CODE (type) == UNION_TYPE)
5138 field = next_initializable_field (DECL_CHAIN (field));
5144 /* Subroutine of reshape_init, which processes a single initializer (part of
5145 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5146 iterator within the CONSTRUCTOR which points to the initializer to process.
5147 FIRST_INITIALIZER_P is true if this is the first initializer of the
5148 outermost CONSTRUCTOR node. */
5151 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5152 tsubst_flags_t complain)
5154 tree init = d->cur->value;
5156 if (error_operand_p (init))
5157 return error_mark_node;
5159 if (TREE_CODE (type) == COMPLEX_TYPE)
5161 /* A complex type can be initialized from one or two initializers,
5162 but braces are not elided. */
5164 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5166 if (CONSTRUCTOR_NELTS (init) > 2)
5168 if (complain & tf_error)
5169 error ("too many initializers for %qT", type);
5171 return error_mark_node;
5174 else if (first_initializer_p && d->cur != d->end)
5176 VEC(constructor_elt, gc) *v = 0;
5177 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5178 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5180 init = build_constructor (init_list_type_node, v);
5185 /* A non-aggregate type is always initialized with a single
5187 if (!CP_AGGREGATE_TYPE_P (type))
5189 /* It is invalid to initialize a non-aggregate type with a
5190 brace-enclosed initializer before C++0x.
5191 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5192 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5193 a CONSTRUCTOR (with a record type). */
5194 if (TREE_CODE (init) == CONSTRUCTOR
5195 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5197 if (SCALAR_TYPE_P (type))
5199 if (complain & tf_error)
5200 error ("braces around scalar initializer for type %qT", type);
5201 init = error_mark_node;
5204 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5213 All implicit type conversions (clause _conv_) are considered when
5214 initializing the aggregate member with an initializer from an
5215 initializer-list. If the initializer can initialize a member,
5216 the member is initialized. Otherwise, if the member is itself a
5217 non-empty subaggregate, brace elision is assumed and the
5218 initializer is considered for the initialization of the first
5219 member of the subaggregate. */
5220 if (TREE_CODE (init) != CONSTRUCTOR
5221 /* But don't try this for the first initializer, since that would be
5222 looking through the outermost braces; A a2 = { a1 }; is not a
5223 valid aggregate initialization. */
5224 && !first_initializer_p
5225 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5226 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5232 /* [dcl.init.string]
5234 A char array (whether plain char, signed char, or unsigned char)
5235 can be initialized by a string-literal (optionally enclosed in
5236 braces); a wchar_t array can be initialized by a wide
5237 string-literal (optionally enclosed in braces). */
5238 if (TREE_CODE (type) == ARRAY_TYPE
5239 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5241 tree str_init = init;
5243 /* Strip one level of braces if and only if they enclose a single
5244 element (as allowed by [dcl.init.string]). */
5245 if (!first_initializer_p
5246 && TREE_CODE (str_init) == CONSTRUCTOR
5247 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5249 str_init = VEC_index (constructor_elt,
5250 CONSTRUCTOR_ELTS (str_init), 0)->value;
5253 /* If it's a string literal, then it's the initializer for the array
5254 as a whole. Otherwise, continue with normal initialization for
5255 array types (one value per array element). */
5256 if (TREE_CODE (str_init) == STRING_CST)
5263 /* The following cases are about aggregates. If we are not within a full
5264 initializer already, and there is not a CONSTRUCTOR, it means that there
5265 is a missing set of braces (that is, we are processing the case for
5266 which reshape_init exists). */
5267 if (!first_initializer_p)
5269 if (TREE_CODE (init) == CONSTRUCTOR)
5271 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5272 /* There is no need to reshape pointer-to-member function
5273 initializers, as they are always constructed correctly
5274 by the front end. */
5276 else if (COMPOUND_LITERAL_P (init))
5277 /* For a nested compound literal, there is no need to reshape since
5278 brace elision is not allowed. Even if we decided to allow it,
5279 we should add a call to reshape_init in finish_compound_literal,
5280 before calling digest_init, so changing this code would still
5281 not be necessary. */
5282 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5286 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5287 return reshape_init (type, init, complain);
5291 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5295 /* Dispatch to specialized routines. */
5296 if (CLASS_TYPE_P (type))
5297 return reshape_init_class (type, d, first_initializer_p, complain);
5298 else if (TREE_CODE (type) == ARRAY_TYPE)
5299 return reshape_init_array (type, d, complain);
5300 else if (TREE_CODE (type) == VECTOR_TYPE)
5301 return reshape_init_vector (type, d, complain);
5306 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5307 brace-enclosed aggregate initializer.
5309 INIT is the CONSTRUCTOR containing the list of initializers describing
5310 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5311 It may not presently match the shape of the TYPE; for example:
5313 struct S { int a; int b; };
5314 struct S a[] = { 1, 2, 3, 4 };
5316 Here INIT will hold a VEC of four elements, rather than a
5317 VEC of two elements, each itself a VEC of two elements. This
5318 routine transforms INIT from the former form into the latter. The
5319 revised CONSTRUCTOR node is returned. */
5322 reshape_init (tree type, tree init, tsubst_flags_t complain)
5324 VEC(constructor_elt, gc) *v;
5328 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5330 v = CONSTRUCTOR_ELTS (init);
5332 /* An empty constructor does not need reshaping, and it is always a valid
5334 if (VEC_empty (constructor_elt, v))
5337 /* Recurse on this CONSTRUCTOR. */
5338 d.cur = VEC_index (constructor_elt, v, 0);
5339 d.end = d.cur + VEC_length (constructor_elt, v);
5341 new_init = reshape_init_r (type, &d, true, complain);
5342 if (new_init == error_mark_node)
5343 return error_mark_node;
5345 /* Make sure all the element of the constructor were used. Otherwise,
5346 issue an error about exceeding initializers. */
5349 if (complain & tf_error)
5350 error ("too many initializers for %qT", type);
5352 return error_mark_node;
5358 /* Verify array initializer. Returns true if errors have been reported. */
5361 check_array_initializer (tree decl, tree type, tree init)
5363 tree element_type = TREE_TYPE (type);
5365 /* The array type itself need not be complete, because the
5366 initializer may tell us how many elements are in the array.
5367 But, the elements of the array must be complete. */
5368 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5371 error ("elements of array %q#D have incomplete type", decl);
5373 error ("elements of array %q#T have incomplete type", type);
5376 /* It is not valid to initialize a VLA. */
5378 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5379 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5382 error ("variable-sized object %qD may not be initialized", decl);
5384 error ("variable-sized compound literal");
5390 /* Subroutine of check_initializer; args are passed down from that function.
5391 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5394 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5397 int saved_stmts_are_full_exprs_p = 0;
5398 if (building_stmt_list_p ())
5400 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5401 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5403 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5404 if (building_stmt_list_p ())
5405 current_stmt_tree ()->stmts_are_full_exprs_p =
5406 saved_stmts_are_full_exprs_p;
5410 /* Verify INIT (the initializer for DECL), and record the
5411 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5412 grok_reference_init.
5414 If the return value is non-NULL, it is an expression that must be
5415 evaluated dynamically to initialize DECL. */
5418 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5420 tree type = TREE_TYPE (decl);
5421 tree init_code = NULL;
5422 tree extra_init = NULL_TREE;
5425 /* Things that are going to be initialized need to have complete
5427 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5429 if (DECL_HAS_VALUE_EXPR_P (decl))
5431 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5432 it doesn't have storage to be initialized. */
5433 gcc_assert (init == NULL_TREE);
5437 if (type == error_mark_node)
5438 /* We will have already complained. */
5441 if (TREE_CODE (type) == ARRAY_TYPE)
5443 if (check_array_initializer (decl, type, init))
5446 else if (!COMPLETE_TYPE_P (type))
5448 error ("%qD has incomplete type", decl);
5449 TREE_TYPE (decl) = error_mark_node;
5453 /* There is no way to make a variable-sized class type in GNU C++. */
5454 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5456 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5458 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5459 if (SCALAR_TYPE_P (type))
5463 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5464 init = build_zero_init (type, NULL_TREE, false);
5466 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5468 error ("scalar object %qD requires one element in initializer",
5470 TREE_TYPE (decl) = error_mark_node;
5476 if (TREE_CODE (decl) == CONST_DECL)
5478 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5480 DECL_INITIAL (decl) = init;
5482 gcc_assert (init != NULL_TREE);
5485 else if (!init && DECL_REALLY_EXTERN (decl))
5487 else if (TREE_CODE (type) == REFERENCE_TYPE)
5488 init = grok_reference_init (decl, type, init, cleanup, flags);
5489 else if (init || type_build_ctor_call (type))
5492 check_for_uninitialized_const_var (decl);
5493 /* Do not reshape constructors of vectors (they don't need to be
5495 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5497 if (is_std_init_list (type))
5498 init = build_init_list_var_init (decl, type, init,
5499 &extra_init, cleanup);
5500 else if (TYPE_NON_AGGREGATE_CLASS (type))
5502 /* Don't reshape if the class has constructors. */
5503 if (cxx_dialect == cxx98)
5504 error ("in C++98 %qD must be initialized by constructor, "
5508 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5510 error ("opaque vector types cannot be initialized");
5511 init = error_mark_node;
5515 init = reshape_init (type, init, tf_warning_or_error);
5516 if (cxx_dialect >= cxx0x && SCALAR_TYPE_P (type))
5517 check_narrowing (type, init);
5521 /* If DECL has an array type without a specific bound, deduce the
5522 array size from the initializer. */
5523 maybe_deduce_size_from_array_init (decl, init);
5524 type = TREE_TYPE (decl);
5525 if (type == error_mark_node)
5528 if (type_build_ctor_call (type)
5529 || (CLASS_TYPE_P (type)
5530 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init))))
5532 init_code = build_aggr_init_full_exprs (decl, init, flags);
5534 /* If this is a constexpr initializer, expand_default_init will
5535 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5536 case, pull the initializer back out and pass it down into
5537 store_init_value. */
5538 while (TREE_CODE (init_code) == EXPR_STMT
5539 || TREE_CODE (init_code) == CONVERT_EXPR)
5540 init_code = TREE_OPERAND (init_code, 0);
5541 if (TREE_CODE (init_code) == INIT_EXPR)
5543 init = TREE_OPERAND (init_code, 1);
5544 init_code = NULL_TREE;
5545 /* Don't call digest_init; it's unnecessary and will complain
5546 about aggregate initialization of non-aggregate classes. */
5547 flags |= LOOKUP_ALREADY_DIGESTED;
5549 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5551 /* Declared constexpr, but no suitable initializer; massage
5552 init appropriately so we can pass it into store_init_value
5554 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5555 init = finish_compound_literal (type, init,
5556 tf_warning_or_error);
5557 else if (CLASS_TYPE_P (type)
5558 && (!init || TREE_CODE (init) == TREE_LIST))
5560 init = build_functional_cast (type, init, tf_none);
5561 if (init != error_mark_node)
5562 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5564 init_code = NULL_TREE;
5570 if (init && TREE_CODE (init) != TREE_VEC)
5572 init_code = store_init_value (decl, init, flags);
5573 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5574 && DECL_INITIAL (decl)
5575 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5576 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5577 warning (0, "array %qD initialized by parenthesized string literal %qE",
5578 decl, DECL_INITIAL (decl));
5584 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5585 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5586 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5587 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5590 check_for_uninitialized_const_var (decl);
5593 if (init && init != error_mark_node)
5594 init_code = build2 (INIT_EXPR, type, decl, init);
5597 init_code = add_stmt_to_compound (extra_init, init_code);
5599 if (init_code && DECL_IN_AGGR_P (decl))
5601 static int explained = 0;
5603 if (cxx_dialect < cxx0x)
5604 error ("initializer invalid for static member with constructor");
5606 error ("non-constant in-class initialization invalid for static "
5607 "member %qD", decl);
5610 error ("(an out of class initialization is required)");
5618 /* If DECL is not a local variable, give it RTL. */
5621 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5623 int toplev = toplevel_bindings_p ();
5625 const char *filename;
5627 /* Set the DECL_ASSEMBLER_NAME for the object. */
5630 /* The `register' keyword, when used together with an
5631 asm-specification, indicates that the variable should be
5632 placed in a particular register. */
5633 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5635 set_user_assembler_name (decl, asmspec);
5636 DECL_HARD_REGISTER (decl) = 1;
5640 if (TREE_CODE (decl) == FUNCTION_DECL
5641 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5642 set_builtin_user_assembler_name (decl, asmspec);
5643 set_user_assembler_name (decl, asmspec);
5647 /* Handle non-variables up front. */
5648 if (TREE_CODE (decl) != VAR_DECL)
5650 rest_of_decl_compilation (decl, toplev, at_eof);
5654 /* If we see a class member here, it should be a static data
5656 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5658 gcc_assert (TREE_STATIC (decl));
5659 /* An in-class declaration of a static data member should be
5660 external; it is only a declaration, and not a definition. */
5661 if (init == NULL_TREE)
5662 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5665 /* We don't create any RTL for local variables. */
5666 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5669 /* We defer emission of local statics until the corresponding
5670 DECL_EXPR is expanded. */
5671 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5673 /* We try to defer namespace-scope static constants so that they are
5674 not emitted into the object file unnecessarily. */
5675 filename = input_filename;
5676 if (!DECL_VIRTUAL_P (decl)
5677 && TREE_READONLY (decl)
5678 && DECL_INITIAL (decl) != NULL_TREE
5679 && DECL_INITIAL (decl) != error_mark_node
5681 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5683 && !TREE_PUBLIC (decl))
5685 /* Fool with the linkage of static consts according to #pragma
5687 struct c_fileinfo *finfo = get_fileinfo (filename);
5688 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5690 TREE_PUBLIC (decl) = 1;
5691 DECL_EXTERNAL (decl) = finfo->interface_only;
5696 /* Likewise for template instantiations. */
5697 else if (DECL_LANG_SPECIFIC (decl)
5698 && DECL_IMPLICIT_INSTANTIATION (decl))
5701 /* If we're not deferring, go ahead and assemble the variable. */
5703 rest_of_decl_compilation (decl, toplev, at_eof);
5706 /* walk_tree helper for wrap_temporary_cleanups, below. */
5709 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5711 if (TYPE_P (*stmt_p))
5717 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5719 tree guard = (tree)data;
5720 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5722 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5723 /* Tell honor_protect_cleanup_actions to handle this as a separate
5725 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5727 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5733 /* We're initializing a local variable which has a cleanup GUARD. If there
5734 are any temporaries used in the initializer INIT of this variable, we
5735 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5736 variable will be cleaned up properly if one of them throws.
5738 Unfortunately, there's no way to express this properly in terms of
5739 nesting, as the regions for the temporaries overlap the region for the
5740 variable itself; if there are two temporaries, the variable needs to be
5741 the first thing destroyed if either of them throws. However, we only
5742 want to run the variable's cleanup if it actually got constructed. So
5743 we need to guard the temporary cleanups with the variable's cleanup if
5744 they are run on the normal path, but not if they are run on the
5745 exceptional path. We implement this by telling
5746 honor_protect_cleanup_actions to strip the variable cleanup from the
5747 exceptional path. */
5750 wrap_temporary_cleanups (tree init, tree guard)
5752 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5755 /* Generate code to initialize DECL (a local variable). */
5758 initialize_local_var (tree decl, tree init)
5760 tree type = TREE_TYPE (decl);
5764 gcc_assert (TREE_CODE (decl) == VAR_DECL
5765 || TREE_CODE (decl) == RESULT_DECL);
5766 gcc_assert (!TREE_STATIC (decl));
5768 if (DECL_SIZE (decl) == NULL_TREE)
5770 /* If we used it already as memory, it must stay in memory. */
5771 DECL_INITIAL (decl) = NULL_TREE;
5772 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5776 if (type == error_mark_node)
5779 /* Compute and store the initial value. */
5780 already_used = TREE_USED (decl) || TREE_USED (type);
5781 if (TREE_USED (type))
5782 DECL_READ_P (decl) = 1;
5784 /* Generate a cleanup, if necessary. */
5785 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5787 /* Perform the initialization. */
5790 if (TREE_CODE (init) == INIT_EXPR
5791 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5793 /* Stick simple initializers in DECL_INITIAL so that
5794 -Wno-init-self works (c++/34772). */
5795 gcc_assert (TREE_OPERAND (init, 0) == decl);
5796 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5800 int saved_stmts_are_full_exprs_p;
5802 /* If we're only initializing a single object, guard the
5803 destructors of any temporaries used in its initializer with
5804 its destructor. This isn't right for arrays because each
5805 element initialization is a full-expression. */
5806 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5807 wrap_temporary_cleanups (init, cleanup);
5809 gcc_assert (building_stmt_list_p ());
5810 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5811 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5812 finish_expr_stmt (init);
5813 current_stmt_tree ()->stmts_are_full_exprs_p =
5814 saved_stmts_are_full_exprs_p;
5818 /* Set this to 0 so we can tell whether an aggregate which was
5819 initialized was ever used. Don't do this if it has a
5820 destructor, so we don't complain about the 'resource
5821 allocation is initialization' idiom. Now set
5822 attribute((unused)) on types so decls of that type will be
5823 marked used. (see TREE_USED, above.) */
5824 if (TYPE_NEEDS_CONSTRUCTING (type)
5826 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5827 && DECL_NAME (decl))
5828 TREE_USED (decl) = 0;
5829 else if (already_used)
5830 TREE_USED (decl) = 1;
5833 finish_decl_cleanup (decl, cleanup);
5836 /* DECL is a VAR_DECL for a compiler-generated variable with static
5837 storage duration (like a virtual table) whose initializer is a
5838 compile-time constant. Initialize the variable and provide it to the
5842 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5845 gcc_assert (DECL_ARTIFICIAL (decl));
5846 init = build_constructor (TREE_TYPE (decl), v);
5847 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5848 DECL_INITIAL (decl) = init;
5849 DECL_INITIALIZED_P (decl) = 1;
5850 determine_visibility (decl);
5851 layout_var_decl (decl);
5852 maybe_commonize_var (decl);
5853 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5856 /* INIT is the initializer for a variable, as represented by the
5857 parser. Returns true iff INIT is type-dependent. */
5860 type_dependent_init_p (tree init)
5862 if (TREE_CODE (init) == TREE_LIST)
5863 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5864 return any_type_dependent_elements_p (init);
5865 else if (TREE_CODE (init) == CONSTRUCTOR)
5866 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5868 VEC(constructor_elt, gc) *elts;
5872 elts = CONSTRUCTOR_ELTS (init);
5873 nelts = VEC_length (constructor_elt, elts);
5874 for (i = 0; i < nelts; ++i)
5875 if (type_dependent_init_p (VEC_index (constructor_elt,
5880 /* It must be a simple expression, e.g., int i = 3; */
5881 return type_dependent_expression_p (init);
5886 /* INIT is the initializer for a variable, as represented by the
5887 parser. Returns true iff INIT is value-dependent. */
5890 value_dependent_init_p (tree init)
5892 if (TREE_CODE (init) == TREE_LIST)
5893 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5894 return any_value_dependent_elements_p (init);
5895 else if (TREE_CODE (init) == CONSTRUCTOR)
5896 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5898 VEC(constructor_elt, gc) *elts;
5902 elts = CONSTRUCTOR_ELTS (init);
5903 nelts = VEC_length (constructor_elt, elts);
5904 for (i = 0; i < nelts; ++i)
5905 if (value_dependent_init_p (VEC_index (constructor_elt,
5910 /* It must be a simple expression, e.g., int i = 3; */
5911 return value_dependent_expression_p (init);
5916 /* Finish processing of a declaration;
5917 install its line number and initial value.
5918 If the length of an array type is not known before,
5919 it must be determined now, from the initial value, or it is an error.
5921 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5922 true, then INIT is an integral constant expression.
5924 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5925 if the (init) syntax was used. */
5928 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5929 tree asmspec_tree, int flags)
5933 const char *asmspec = NULL;
5934 int was_readonly = 0;
5935 bool var_definition_p = false;
5938 if (decl == error_mark_node)
5943 error ("assignment (not initialization) in declaration");
5947 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5948 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5949 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5951 type = TREE_TYPE (decl);
5952 if (type == error_mark_node)
5955 /* Assume no cleanup is required. */
5956 cleanup = NULL_TREE;
5958 /* If a name was specified, get the string. */
5959 if (at_namespace_scope_p ())
5960 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5961 if (asmspec_tree && asmspec_tree != error_mark_node)
5962 asmspec = TREE_STRING_POINTER (asmspec_tree);
5964 if (current_class_type
5965 && CP_DECL_CONTEXT (decl) == current_class_type
5966 && TYPE_BEING_DEFINED (current_class_type)
5967 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5968 && (DECL_INITIAL (decl) || init))
5969 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5971 auto_node = type_uses_auto (type);
5975 if (init == NULL_TREE)
5977 error ("declaration of %q#D has no initializer", decl);
5978 TREE_TYPE (decl) = error_mark_node;
5982 if (TREE_CODE (d_init) == TREE_LIST)
5983 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5984 tf_warning_or_error);
5985 d_init = resolve_nondeduced_context (d_init);
5986 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5988 if (type == error_mark_node)
5992 if (!ensure_literal_type_for_constexpr_object (decl))
5993 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5995 if (TREE_CODE (decl) == VAR_DECL
5996 && DECL_CLASS_SCOPE_P (decl)
5997 && DECL_INITIALIZED_IN_CLASS_P (decl))
5998 check_static_variable_definition (decl, type);
6000 if (init && TREE_CODE (decl) == FUNCTION_DECL)
6003 if (init == ridpointers[(int)RID_DELETE])
6005 /* FIXME check this is 1st decl. */
6006 DECL_DELETED_FN (decl) = 1;
6007 DECL_DECLARED_INLINE_P (decl) = 1;
6008 DECL_INITIAL (decl) = error_mark_node;
6009 FOR_EACH_CLONE (clone, decl)
6011 DECL_DELETED_FN (clone) = 1;
6012 DECL_DECLARED_INLINE_P (clone) = 1;
6013 DECL_INITIAL (clone) = error_mark_node;
6017 else if (init == ridpointers[(int)RID_DEFAULT])
6019 if (defaultable_fn_check (decl))
6020 DECL_DEFAULTED_FN (decl) = 1;
6022 DECL_INITIAL (decl) = NULL_TREE;
6026 if (init && TREE_CODE (decl) == VAR_DECL)
6028 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6029 /* If DECL is a reference, then we want to know whether init is a
6030 reference constant; init_const_expr_p as passed tells us whether
6031 it's an rvalue constant. */
6032 if (TREE_CODE (type) == REFERENCE_TYPE)
6033 init_const_expr_p = potential_constant_expression (init);
6034 if (init_const_expr_p)
6036 /* Set these flags now for templates. We'll update the flags in
6037 store_init_value for instantiations. */
6038 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6039 if (decl_maybe_constant_var_p (decl))
6040 TREE_CONSTANT (decl) = 1;
6044 if (processing_template_decl)
6046 bool type_dependent_p;
6048 /* Add this declaration to the statement-tree. */
6049 if (at_function_scope_p ())
6050 add_decl_expr (decl);
6052 type_dependent_p = dependent_type_p (type);
6054 if (check_for_bare_parameter_packs (init))
6057 DECL_INITIAL (decl) = NULL_TREE;
6060 /* Generally, initializers in templates are expanded when the
6061 template is instantiated. But, if DECL is a variable constant
6062 then it can be used in future constant expressions, so its value
6063 must be available. */
6065 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6066 /* We can't do anything if the decl has dependent type. */;
6068 && init_const_expr_p
6069 && !type_dependent_p
6070 && decl_maybe_constant_var_p (decl)
6071 && !type_dependent_init_p (init)
6072 && !value_dependent_init_p (init))
6074 /* This variable seems to be a non-dependent constant, so process
6075 its initializer. If check_initializer returns non-null the
6076 initialization wasn't constant after all. */
6077 tree init_code = check_initializer (decl, init, flags, &cleanup);
6078 if (init_code == NULL_TREE)
6081 else if (!DECL_PRETTY_FUNCTION_P (decl))
6082 /* Deduce array size even if the initializer is dependent. */
6083 maybe_deduce_size_from_array_init (decl, init);
6086 DECL_INITIAL (decl) = init;
6090 /* Just store non-static data member initializers for later. */
6091 if (init && TREE_CODE (decl) == FIELD_DECL)
6092 DECL_INITIAL (decl) = init;
6094 /* Take care of TYPE_DECLs up front. */
6095 if (TREE_CODE (decl) == TYPE_DECL)
6097 if (type != error_mark_node
6098 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6100 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6101 warning (0, "shadowing previous type declaration of %q#D", decl);
6102 set_identifier_type_value (DECL_NAME (decl), decl);
6105 /* If we have installed this as the canonical typedef for this
6106 type, and that type has not been defined yet, delay emitting
6107 the debug information for it, as we will emit it later. */
6108 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6109 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6110 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6112 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6117 /* A reference will be modified here, as it is initialized. */
6118 if (! DECL_EXTERNAL (decl)
6119 && TREE_READONLY (decl)
6120 && TREE_CODE (type) == REFERENCE_TYPE)
6123 TREE_READONLY (decl) = 0;
6126 if (TREE_CODE (decl) == VAR_DECL)
6128 /* Only variables with trivial initialization and destruction can
6129 have thread-local storage. */
6130 if (DECL_THREAD_LOCAL_P (decl)
6131 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6132 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6133 error ("%qD cannot be thread-local because it has non-trivial "
6134 "type %qT", decl, TREE_TYPE (decl));
6135 /* If this is a local variable that will need a mangled name,
6136 register it now. We must do this before processing the
6137 initializer for the variable, since the initialization might
6138 require a guard variable, and since the mangled name of the
6139 guard variable will depend on the mangled name of this
6141 if (DECL_FUNCTION_SCOPE_P (decl)
6142 && TREE_STATIC (decl)
6143 && !DECL_ARTIFICIAL (decl))
6145 push_local_name (decl);
6146 if (DECL_CONSTRUCTOR_P (current_function_decl)
6147 || DECL_DESTRUCTOR_P (current_function_decl))
6148 /* Normally local_decls is populated during GIMPLE lowering,
6149 but [cd]tors are never actually compiled directly. We need
6150 to put statics on the list so we can deal with the label
6151 address extension. */
6152 add_local_decl (cfun, decl);
6155 /* Convert the initializer to the type of DECL, if we have not
6156 already initialized DECL. */
6157 if (!DECL_INITIALIZED_P (decl)
6158 /* If !DECL_EXTERNAL then DECL is being defined. In the
6159 case of a static data member initialized inside the
6160 class-specifier, there can be an initializer even if DECL
6161 is *not* defined. */
6162 && (!DECL_EXTERNAL (decl) || init))
6164 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6167 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6168 /* Allow libjava/prims.cc define primitive classes. */
6169 if (init != NULL_TREE
6170 || jclass == NULL_TREE
6171 || TREE_CODE (jclass) != TYPE_DECL
6172 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6173 || !same_type_ignoring_top_level_qualifiers_p
6174 (type, TREE_TYPE (TREE_TYPE (jclass))))
6175 error ("Java object %qD not allocated with %<new%>", decl);
6178 init = check_initializer (decl, init, flags, &cleanup);
6179 /* Thread-local storage cannot be dynamically initialized. */
6180 if (DECL_THREAD_LOCAL_P (decl) && init)
6182 error ("%qD is thread-local and so cannot be dynamically "
6183 "initialized", decl);
6187 /* Check that the initializer for a static data member was a
6188 constant. Although we check in the parser that the
6189 initializer is an integral constant expression, we do not
6190 simplify division-by-zero at the point at which it
6191 occurs. Therefore, in:
6193 struct S { static const int i = 7 / 0; };
6195 we issue an error at this point. It would
6196 probably be better to forbid division by zero in
6197 integral constant expressions. */
6198 if (DECL_EXTERNAL (decl) && init)
6200 error ("%qD cannot be initialized by a non-constant expression"
6201 " when being declared", decl);
6202 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6210 The memory occupied by any object of static storage
6211 duration is zero-initialized at program startup before
6212 any other initialization takes place.
6214 We cannot create an appropriate initializer until after
6215 the type of DECL is finalized. If DECL_INITIAL is set,
6216 then the DECL is statically initialized, and any
6217 necessary zero-initialization has already been performed. */
6218 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6219 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6220 /*nelts=*/NULL_TREE,
6221 /*static_storage_p=*/true);
6222 /* Remember that the initialization for this variable has
6224 DECL_INITIALIZED_P (decl) = 1;
6225 /* This declaration is the definition of this variable,
6226 unless we are initializing a static data member within
6227 the class specifier. */
6228 if (!DECL_EXTERNAL (decl))
6229 var_definition_p = true;
6231 /* If the variable has an array type, lay out the type, even if
6232 there is no initializer. It is valid to index through the
6233 array, and we must get TYPE_ALIGN set correctly on the array
6235 else if (TREE_CODE (type) == ARRAY_TYPE)
6238 if (TREE_STATIC (decl)
6239 && !at_function_scope_p ()
6240 && current_function_decl == NULL)
6241 /* So decl is a global variable or a static member of a
6242 non local class. Record the types it uses
6243 so that we can decide later to emit debug info for them. */
6244 record_types_used_by_current_var_decl (decl);
6246 else if (TREE_CODE (decl) == FIELD_DECL
6247 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6248 error ("non-static data member %qD has Java class type", decl);
6250 /* Add this declaration to the statement-tree. This needs to happen
6251 after the call to check_initializer so that the DECL_EXPR for a
6252 reference temp is added before the DECL_EXPR for the reference itself. */
6253 if (DECL_FUNCTION_SCOPE_P (decl))
6254 add_decl_expr (decl);
6256 /* Let the middle end know about variables and functions -- but not
6257 static data members in uninstantiated class templates. */
6258 if (TREE_CODE (decl) == VAR_DECL
6259 || TREE_CODE (decl) == FUNCTION_DECL)
6261 if (TREE_CODE (decl) == VAR_DECL)
6263 layout_var_decl (decl);
6264 maybe_commonize_var (decl);
6267 /* This needs to happen after the linkage is set. */
6268 determine_visibility (decl);
6270 if (var_definition_p && TREE_STATIC (decl))
6272 /* If a TREE_READONLY variable needs initialization
6273 at runtime, it is no longer readonly and we need to
6274 avoid MEM_READONLY_P being set on RTL created for it. */
6277 if (TREE_READONLY (decl))
6278 TREE_READONLY (decl) = 0;
6281 else if (was_readonly)
6282 TREE_READONLY (decl) = 1;
6285 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6287 /* Check for abstractness of the type. Notice that there is no
6288 need to strip array types here since the check for those types
6289 is already done within create_array_type_for_decl. */
6290 if (TREE_CODE (type) == FUNCTION_TYPE
6291 || TREE_CODE (type) == METHOD_TYPE)
6292 abstract_virtuals_error (decl, TREE_TYPE (type));
6294 abstract_virtuals_error (decl, type);
6296 if (TREE_TYPE (decl) == error_mark_node)
6297 /* No initialization required. */
6299 else if (TREE_CODE (decl) == FUNCTION_DECL)
6303 if (init == ridpointers[(int)RID_DEFAULT])
6305 /* An out-of-class default definition is defined at
6306 the point where it is explicitly defaulted. */
6307 if (DECL_DELETED_FN (decl))
6308 maybe_explain_implicit_delete (decl);
6309 else if (DECL_INITIAL (decl) == error_mark_node)
6310 synthesize_method (decl);
6313 error ("function %q#D is initialized like a variable", decl);
6315 /* else no initialization required. */
6317 else if (DECL_EXTERNAL (decl)
6318 && ! (DECL_LANG_SPECIFIC (decl)
6319 && DECL_NOT_REALLY_EXTERN (decl)))
6322 DECL_INITIAL (decl) = init;
6324 /* A variable definition. */
6325 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6326 /* Initialize the local variable. */
6327 initialize_local_var (decl, init);
6329 /* If a variable is defined, and then a subsequent
6330 definition with external linkage is encountered, we will
6331 get here twice for the same variable. We want to avoid
6332 calling expand_static_init more than once. For variables
6333 that are not static data members, we can call
6334 expand_static_init only when we actually process the
6335 initializer. It is not legal to redeclare a static data
6336 member, so this issue does not arise in that case. */
6337 else if (var_definition_p && TREE_STATIC (decl))
6338 expand_static_init (decl, init);
6341 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6342 reference, insert it in the statement-tree now. */
6344 push_cleanup (decl, cleanup, false);
6347 TREE_READONLY (decl) = 1;
6349 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6352 /* Returns a declaration for a VAR_DECL as if:
6354 extern "C" TYPE NAME;
6356 had been seen. Used to create compiler-generated global
6360 declare_global_var (tree name, tree type)
6364 push_to_top_level ();
6365 decl = build_decl (input_location, VAR_DECL, name, type);
6366 TREE_PUBLIC (decl) = 1;
6367 DECL_EXTERNAL (decl) = 1;
6368 DECL_ARTIFICIAL (decl) = 1;
6369 /* If the user has explicitly declared this variable (perhaps
6370 because the code we are compiling is part of a low-level runtime
6371 library), then it is possible that our declaration will be merged
6372 with theirs by pushdecl. */
6373 decl = pushdecl (decl);
6374 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6375 pop_from_top_level ();
6380 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6381 if "__cxa_atexit" is not being used) corresponding to the function
6382 to be called when the program exits. */
6385 get_atexit_fn_ptr_type (void)
6389 if (!atexit_fn_ptr_type_node)
6392 if (flag_use_cxa_atexit
6393 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6394 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6395 arg_type = ptr_type_node;
6397 /* The parameter to "atexit" is "void (*)(void)". */
6398 arg_type = NULL_TREE;
6400 fn_type = build_function_type_list (void_type_node,
6401 arg_type, NULL_TREE);
6402 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6405 return atexit_fn_ptr_type_node;
6408 /* Returns a pointer to the `atexit' function. Note that if
6409 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6410 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6413 get_atexit_node (void)
6419 bool use_aeabi_atexit;
6424 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6426 /* The declaration for `__cxa_atexit' is:
6428 int __cxa_atexit (void (*)(void *), void *, void *)
6430 We build up the argument types and then the function type
6432 tree argtype0, argtype1, argtype2;
6434 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6435 /* First, build the pointer-to-function type for the first
6437 fn_ptr_type = get_atexit_fn_ptr_type ();
6438 /* Then, build the rest of the argument types. */
6439 argtype2 = ptr_type_node;
6440 if (use_aeabi_atexit)
6442 argtype1 = fn_ptr_type;
6443 argtype0 = ptr_type_node;
6447 argtype1 = ptr_type_node;
6448 argtype0 = fn_ptr_type;
6450 /* And the final __cxa_atexit type. */
6451 fn_type = build_function_type_list (integer_type_node,
6452 argtype0, argtype1, argtype2,
6454 fn_ptr_type = build_pointer_type (fn_type);
6455 if (use_aeabi_atexit)
6456 name = "__aeabi_atexit";
6458 name = "__cxa_atexit";
6462 /* The declaration for `atexit' is:
6464 int atexit (void (*)());
6466 We build up the argument types and then the function type
6468 fn_ptr_type = get_atexit_fn_ptr_type ();
6469 /* Build the final atexit type. */
6470 fn_type = build_function_type_list (integer_type_node,
6471 fn_ptr_type, NULL_TREE);
6475 /* Now, build the function declaration. */
6476 push_lang_context (lang_name_c);
6477 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6478 mark_used (atexit_fndecl);
6479 pop_lang_context ();
6480 atexit_node = decay_conversion (atexit_fndecl);
6485 /* Returns the __dso_handle VAR_DECL. */
6488 get_dso_handle_node (void)
6490 if (dso_handle_node)
6491 return dso_handle_node;
6493 /* Declare the variable. */
6494 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6497 #ifdef HAVE_GAS_HIDDEN
6498 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6499 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6502 return dso_handle_node;
6505 /* Begin a new function with internal linkage whose job will be simply
6506 to destroy some particular variable. */
6508 static GTY(()) int start_cleanup_cnt;
6511 start_cleanup_fn (void)
6516 bool use_cxa_atexit = flag_use_cxa_atexit
6517 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6519 push_to_top_level ();
6521 /* No need to mangle this. */
6522 push_lang_context (lang_name_c);
6524 /* Build the name of the function. */
6525 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6526 /* Build the function declaration. */
6527 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6528 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6529 /* It's a function with internal linkage, generated by the
6531 TREE_PUBLIC (fndecl) = 0;
6532 DECL_ARTIFICIAL (fndecl) = 1;
6533 /* Make the function `inline' so that it is only emitted if it is
6534 actually needed. It is unlikely that it will be inlined, since
6535 it is only called via a function pointer, but we avoid unnecessary
6536 emissions this way. */
6537 DECL_DECLARED_INLINE_P (fndecl) = 1;
6538 DECL_INTERFACE_KNOWN (fndecl) = 1;
6539 /* Build the parameter. */
6544 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6545 DECL_CONTEXT (parmdecl) = fndecl;
6546 TREE_USED (parmdecl) = 1;
6547 DECL_READ_P (parmdecl) = 1;
6548 DECL_ARGUMENTS (fndecl) = parmdecl;
6552 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6554 pop_lang_context ();
6556 return current_function_decl;
6559 /* Finish the cleanup function begun by start_cleanup_fn. */
6562 end_cleanup_fn (void)
6564 expand_or_defer_fn (finish_function (0));
6566 pop_from_top_level ();
6569 /* Generate code to handle the destruction of DECL, an object with
6570 static storage duration. */
6573 register_dtor_fn (tree decl)
6580 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6582 type = TREE_TYPE (decl);
6583 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6584 return void_zero_node;
6586 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6587 a class object, we can just pass the destructor to
6588 "__cxa_atexit"; we don't have to build a temporary function to do
6590 use_dtor = (flag_use_cxa_atexit
6591 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6592 && CLASS_TYPE_P (type));
6597 /* Find the destructor. */
6598 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6599 gcc_assert (idx >= 0);
6600 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6601 /* Make sure it is accessible. */
6602 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6606 /* Call build_cleanup before we enter the anonymous function so
6607 that any access checks will be done relative to the current
6608 scope, rather than the scope of the anonymous function. */
6609 build_cleanup (decl);
6611 /* Now start the function. */
6612 cleanup = start_cleanup_fn ();
6614 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6615 to the original function, rather than the anonymous one. That
6616 will make the back end think that nested functions are in use,
6617 which causes confusion. */
6618 push_deferring_access_checks (dk_no_check);
6619 fcall = build_cleanup (decl);
6620 pop_deferring_access_checks ();
6622 /* Create the body of the anonymous function. */
6623 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6624 finish_expr_stmt (fcall);
6625 finish_compound_stmt (compound_stmt);
6629 /* Call atexit with the cleanup function. */
6630 mark_used (cleanup);
6631 cleanup = build_address (cleanup);
6632 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6638 /* We must convert CLEANUP to the type that "__cxa_atexit"
6640 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6641 /* "__cxa_atexit" will pass the address of DECL to the
6642 cleanup function. */
6644 addr = build_address (decl);
6645 /* The declared type of the parameter to "__cxa_atexit" is
6646 "void *". For plain "T*", we could just let the
6647 machinery in cp_build_function_call convert it -- but if the
6648 type is "cv-qualified T *", then we need to convert it
6649 before passing it in, to avoid spurious errors. */
6650 addr = build_nop (ptr_type_node, addr);
6653 /* Since the cleanup functions we build ignore the address
6654 they're given, there's no reason to pass the actual address
6655 in, and, in general, it's cheaper to pass NULL than any
6657 addr = null_pointer_node;
6658 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6659 tf_warning_or_error);
6660 if (targetm.cxx.use_aeabi_atexit ())
6673 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6674 arg0, arg1, arg2, NULL_TREE);
6677 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6678 is its initializer. Generate code to handle the construction
6679 and destruction of DECL. */
6682 expand_static_init (tree decl, tree init)
6684 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6685 gcc_assert (TREE_STATIC (decl));
6687 /* Some variables require no dynamic initialization. */
6689 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6692 if (DECL_FUNCTION_SCOPE_P (decl))
6694 /* Emit code to perform this initialization but once. */
6695 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6696 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6697 tree guard, guard_addr;
6700 /* Emit code to perform this initialization but once. This code
6703 static <type> guard;
6704 if (!guard.first_byte) {
6705 if (__cxa_guard_acquire (&guard)) {
6708 // Do initialization.
6709 flag = true; __cxa_guard_release (&guard);
6710 // Register variable for destruction at end of program.
6712 if (!flag) __cxa_guard_abort (&guard);
6716 Note that the `flag' variable is only set to 1 *after* the
6717 initialization is complete. This ensures that an exception,
6718 thrown during the construction, will cause the variable to
6719 reinitialized when we pass through this code again, as per:
6723 If the initialization exits by throwing an exception, the
6724 initialization is not complete, so it will be tried again
6725 the next time control enters the declaration.
6727 This process should be thread-safe, too; multiple threads
6728 should not be able to initialize the variable more than
6731 /* Create the guard variable. */
6732 guard = get_guard (decl);
6734 /* This optimization isn't safe on targets with relaxed memory
6735 consistency. On such targets we force synchronization in
6736 __cxa_guard_acquire. */
6737 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6739 /* Begin the conditional initialization. */
6740 if_stmt = begin_if_stmt ();
6741 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6742 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6745 if (flag_threadsafe_statics)
6747 tree vfntype = NULL_TREE;
6748 tree acquire_name, release_name, abort_name;
6749 tree acquire_fn, release_fn, abort_fn;
6750 guard_addr = build_address (guard);
6752 acquire_name = get_identifier ("__cxa_guard_acquire");
6753 release_name = get_identifier ("__cxa_guard_release");
6754 abort_name = get_identifier ("__cxa_guard_abort");
6755 acquire_fn = identifier_global_value (acquire_name);
6756 release_fn = identifier_global_value (release_name);
6757 abort_fn = identifier_global_value (abort_name);
6759 acquire_fn = push_library_fn
6760 (acquire_name, build_function_type_list (integer_type_node,
6761 TREE_TYPE (guard_addr),
6764 if (!release_fn || !abort_fn)
6765 vfntype = build_function_type_list (void_type_node,
6766 TREE_TYPE (guard_addr),
6769 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6771 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6773 inner_if_stmt = begin_if_stmt ();
6774 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6777 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6778 begin = get_target_expr (boolean_false_node);
6779 flag = TARGET_EXPR_SLOT (begin);
6781 TARGET_EXPR_CLEANUP (begin)
6782 = build3 (COND_EXPR, void_type_node, flag,
6784 build_call_n (abort_fn, 1, guard_addr));
6785 CLEANUP_EH_ONLY (begin) = 1;
6787 /* Do the initialization itself. */
6788 init = add_stmt_to_compound (begin, init);
6789 init = add_stmt_to_compound
6790 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6791 init = add_stmt_to_compound
6792 (init, build_call_n (release_fn, 1, guard_addr));
6795 init = add_stmt_to_compound (init, set_guard (guard));
6797 /* Use atexit to register a function for destroying this static
6799 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6801 finish_expr_stmt (init);
6803 if (flag_threadsafe_statics)
6805 finish_compound_stmt (inner_then_clause);
6806 finish_then_clause (inner_if_stmt);
6807 finish_if_stmt (inner_if_stmt);
6810 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6812 finish_compound_stmt (then_clause);
6813 finish_then_clause (if_stmt);
6814 finish_if_stmt (if_stmt);
6818 static_aggregates = tree_cons (init, decl, static_aggregates);
6822 /* Make TYPE a complete type based on INITIAL_VALUE.
6823 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6824 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6825 3 if the initializer list is empty (in pedantic mode). */
6828 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6831 tree type, elt_type;
6835 unsigned HOST_WIDE_INT i;
6838 /* An array of character type can be initialized from a
6839 brace-enclosed string constant.
6841 FIXME: this code is duplicated from reshape_init. Probably
6842 we should just call reshape_init here? */
6843 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6844 && TREE_CODE (initial_value) == CONSTRUCTOR
6845 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6847 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6848 tree value = VEC_index (constructor_elt, v, 0)->value;
6850 if (TREE_CODE (value) == STRING_CST
6851 && VEC_length (constructor_elt, v) == 1)
6852 initial_value = value;
6855 /* If any of the elements are parameter packs, we can't actually
6856 complete this type now because the array size is dependent. */
6857 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6859 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6862 if (PACK_EXPANSION_P (value))
6868 failure = complete_array_type (ptype, initial_value, do_default);
6870 /* We can create the array before the element type is complete, which
6871 means that we didn't have these two bits set in the original type
6872 either. In completing the type, we are expected to propagate these
6873 bits. See also complete_type which does the same thing for arrays
6876 if (TYPE_DOMAIN (type))
6878 elt_type = TREE_TYPE (type);
6879 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6880 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6881 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6887 /* As above, but either give an error or reject zero-size arrays, depending
6891 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6892 bool do_default, tsubst_flags_t complain)
6895 bool sfinae = !(complain & tf_error);
6896 /* In SFINAE context we can't be lenient about zero-size arrays. */
6899 failure = cp_complete_array_type (ptype, initial_value, do_default);
6905 /* Not an error. */;
6906 else if (failure == 1)
6907 error ("initializer fails to determine size of %qT", *ptype);
6908 else if (failure == 2)
6911 error ("array size missing in %qT", *ptype);
6913 else if (failure == 3)
6914 error ("zero-size array %qT", *ptype);
6915 *ptype = error_mark_node;
6920 /* Return zero if something is declared to be a member of type
6921 CTYPE when in the context of CUR_TYPE. STRING is the error
6922 message to print in that case. Otherwise, quietly return 1. */
6925 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6927 if (ctype && ctype != cur_type)
6929 if (flags == DTOR_FLAG)
6930 error ("destructor for alien class %qT cannot be a member", ctype);
6932 error ("constructor for alien class %qT cannot be a member", ctype);
6938 /* Subroutine of `grokdeclarator'. */
6940 /* Generate errors possibly applicable for a given set of specifiers.
6941 This is for ARM $7.1.2. */
6944 bad_specifiers (tree object,
6945 enum bad_spec_place type,
6956 error ("%qD declared as a %<virtual%> variable", object);
6958 error ("%qD declared as an %<inline%> variable", object);
6960 error ("%<const%> and %<volatile%> function specifiers on "
6961 "%qD invalid in variable declaration", object);
6965 error ("%qD declared as a %<virtual%> parameter", object);
6967 error ("%qD declared as an %<inline%> parameter", object);
6969 error ("%<const%> and %<volatile%> function specifiers on "
6970 "%qD invalid in parameter declaration", object);
6974 error ("%qD declared as a %<virtual%> type", object);
6976 error ("%qD declared as an %<inline%> type", object);
6978 error ("%<const%> and %<volatile%> function specifiers on "
6979 "%qD invalid in type declaration", object);
6983 error ("%qD declared as a %<virtual%> field", object);
6985 error ("%qD declared as an %<inline%> field", object);
6987 error ("%<const%> and %<volatile%> function specifiers on "
6988 "%qD invalid in field declaration", object);
6994 error ("%q+D declared as a friend", object);
6996 && (TREE_CODE (object) == TYPE_DECL
6997 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6998 && !TYPE_REFFN_P (TREE_TYPE (object))
6999 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
7000 error ("%q+D declared with an exception specification", object);
7003 /* DECL is a member function or static data member and is presently
7004 being defined. Check that the definition is taking place in a
7008 check_class_member_definition_namespace (tree decl)
7010 /* These checks only apply to member functions and static data
7012 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7013 || TREE_CODE (decl) == VAR_DECL);
7014 /* We check for problems with specializations in pt.c in
7015 check_specialization_namespace, where we can issue better
7017 if (processing_specialization)
7019 /* There are no restrictions on the placement of
7020 explicit instantiations. */
7021 if (processing_explicit_instantiation)
7025 A member function definition that appears outside of the
7026 class definition shall appear in a namespace scope enclosing
7027 the class definition.
7031 The definition for a static data member shall appear in a
7032 namespace scope enclosing the member's class definition. */
7033 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7034 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7035 decl, DECL_CONTEXT (decl));
7038 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7039 METHOD_TYPE for a non-static member function; QUALS are the
7040 cv-qualifiers that apply to the function. */
7043 build_this_parm (tree type, cp_cv_quals quals)
7048 cp_cv_quals this_quals;
7050 if (CLASS_TYPE_P (type))
7053 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7054 this_type = build_pointer_type (this_type);
7057 this_type = type_of_this_parm (type);
7058 /* The `this' parameter is implicitly `const'; it cannot be
7060 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7061 qual_type = cp_build_qualified_type (this_type, this_quals);
7062 parm = build_artificial_parm (this_identifier, qual_type);
7063 cp_apply_type_quals_to_decl (this_quals, parm);
7067 /* DECL is a static member function. Complain if it was declared
7068 with function-cv-quals. */
7071 check_static_quals (tree decl, cp_cv_quals quals)
7073 if (quals != TYPE_UNQUALIFIED)
7074 error ("static member function %q#D declared with type qualifiers",
7078 /* CTYPE is class type, or null if non-class.
7079 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7081 DECLARATOR is the function's name.
7082 PARMS is a chain of PARM_DECLs for the function.
7083 VIRTUALP is truthvalue of whether the function is virtual or not.
7084 FLAGS are to be passed through to `grokclassfn'.
7085 QUALS are qualifiers indicating whether the function is `const'
7087 RAISES is a list of exceptions that this function can raise.
7088 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7089 not look, and -1 if we should not call `grokclassfn' at all.
7091 SFK is the kind of special function (if any) for the new function.
7093 Returns `NULL_TREE' if something goes wrong, after issuing
7094 applicable error messages. */
7097 grokfndecl (tree ctype,
7101 tree orig_declarator,
7103 enum overload_flags flags,
7110 special_function_kind sfk,
7115 location_t location)
7118 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7122 type = build_exception_variant (type, raises);
7124 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7126 /* If we have an explicit location, use it, otherwise use whatever
7127 build_lang_decl used (probably input_location). */
7128 if (location != UNKNOWN_LOCATION)
7129 DECL_SOURCE_LOCATION (decl) = location;
7131 if (TREE_CODE (type) == METHOD_TYPE)
7134 parm = build_this_parm (type, quals);
7135 DECL_CHAIN (parm) = parms;
7138 DECL_ARGUMENTS (decl) = parms;
7139 for (t = parms; t; t = DECL_CHAIN (t))
7140 DECL_CONTEXT (t) = decl;
7141 /* Propagate volatile out from type to decl. */
7142 if (TYPE_VOLATILE (type))
7143 TREE_THIS_VOLATILE (decl) = 1;
7145 /* Setup decl according to sfk. */
7148 case sfk_constructor:
7149 case sfk_copy_constructor:
7150 case sfk_move_constructor:
7151 DECL_CONSTRUCTOR_P (decl) = 1;
7153 case sfk_destructor:
7154 DECL_DESTRUCTOR_P (decl) = 1;
7160 /* If pointers to member functions use the least significant bit to
7161 indicate whether a function is virtual, ensure a pointer
7162 to this function will have that bit clear. */
7163 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7164 && TREE_CODE (type) == METHOD_TYPE
7165 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7166 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7169 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7173 ("defining explicit specialization %qD in friend declaration",
7177 tree fns = TREE_OPERAND (orig_declarator, 0);
7178 tree args = TREE_OPERAND (orig_declarator, 1);
7180 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7182 /* Something like `template <class T> friend void f<T>()'. */
7183 error ("invalid use of template-id %qD in declaration "
7184 "of primary template",
7190 /* A friend declaration of the form friend void f<>(). Record
7191 the information in the TEMPLATE_ID_EXPR. */
7192 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7194 if (TREE_CODE (fns) == COMPONENT_REF)
7196 /* Due to bison parser ickiness, we will have already looked
7197 up an operator_name or PFUNCNAME within the current class
7198 (see template_id in parse.y). If the current class contains
7199 such a name, we'll get a COMPONENT_REF here. Undo that. */
7201 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7202 == current_class_type);
7203 fns = TREE_OPERAND (fns, 1);
7205 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7206 || TREE_CODE (fns) == OVERLOAD);
7207 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7209 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7210 if (TREE_PURPOSE (t)
7211 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7213 error ("default arguments are not allowed in declaration "
7214 "of friend template specialization %qD",
7221 error ("%<inline%> is not allowed in declaration of friend "
7222 "template specialization %qD",
7229 /* If this decl has namespace scope, set that up. */
7231 set_decl_namespace (decl, in_namespace, friendp);
7233 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7235 /* `main' and builtins have implicit 'C' linkage. */
7236 if ((MAIN_NAME_P (declarator)
7237 || (IDENTIFIER_LENGTH (declarator) > 10
7238 && IDENTIFIER_POINTER (declarator)[0] == '_'
7239 && IDENTIFIER_POINTER (declarator)[1] == '_'
7240 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7241 && current_lang_name == lang_name_cplusplus
7242 && ctype == NULL_TREE
7243 && DECL_FILE_SCOPE_P (decl))
7244 SET_DECL_LANGUAGE (decl, lang_c);
7246 /* Should probably propagate const out from type to decl I bet (mrs). */
7249 DECL_STATIC_FUNCTION_P (decl) = 1;
7250 DECL_CONTEXT (decl) = ctype;
7255 DECL_CONTEXT (decl) = ctype;
7257 check_class_member_definition_namespace (decl);
7260 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7262 if (processing_template_decl)
7263 error ("cannot declare %<::main%> to be a template");
7265 error ("cannot declare %<::main%> to be inline");
7267 error ("cannot declare %<::main%> to be static");
7272 /* Members of anonymous types and local classes have no linkage; make
7273 them internal. If a typedef is made later, this will be changed. */
7274 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7275 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7278 if (publicp && cxx_dialect == cxx98)
7280 /* [basic.link]: A name with no linkage (notably, the name of a class
7281 or enumeration declared in a local scope) shall not be used to
7282 declare an entity with linkage.
7284 DR 757 relaxes this restriction for C++0x. */
7285 t = no_linkage_check (TREE_TYPE (decl),
7286 /*relaxed_p=*/false);
7289 if (TYPE_ANONYMOUS_P (t))
7291 if (DECL_EXTERN_C_P (decl))
7292 /* Allow this; it's pretty common in C. */;
7295 permerror (input_location, "anonymous type with no linkage "
7296 "used to declare function %q#D with linkage",
7298 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7299 permerror (input_location, "%q+#D does not refer to the unqualified "
7300 "type, so it is not used for linkage",
7305 permerror (input_location, "type %qT with no linkage used to "
7306 "declare function %q#D with linkage", t, decl);
7310 TREE_PUBLIC (decl) = publicp;
7313 DECL_INTERFACE_KNOWN (decl) = 1;
7314 DECL_NOT_REALLY_EXTERN (decl) = 1;
7317 /* If the declaration was declared inline, mark it as such. */
7319 DECL_DECLARED_INLINE_P (decl) = 1;
7321 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7323 DECL_EXTERNAL (decl) = 1;
7324 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7327 ? G_("static member function %qD cannot have cv-qualifier")
7328 : G_("non-member function %qD cannot have cv-qualifier"),
7330 quals = TYPE_UNQUALIFIED;
7333 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7334 && !grok_op_properties (decl, /*complain=*/true))
7338 /* Make the init_value nonzero so pushdecl knows this is not
7339 tentative. error_mark_node is replaced later with the BLOCK. */
7340 DECL_INITIAL (decl) = error_mark_node;
7342 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7343 TREE_NOTHROW (decl) = 1;
7345 /* Caller will do the rest of this. */
7349 if (ctype != NULL_TREE)
7350 grokclassfn (ctype, decl, flags);
7352 decl = check_explicit_specialization (orig_declarator, decl,
7355 4 * (friendp != 0));
7356 if (decl == error_mark_node)
7359 if (DECL_STATIC_FUNCTION_P (decl))
7360 check_static_quals (decl, quals);
7364 cplus_decl_attributes (&decl, *attrlist, 0);
7365 *attrlist = NULL_TREE;
7368 /* Check main's type after attributes have been applied. */
7369 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7371 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7374 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7376 error ("%<::main%> must return %<int%>");
7377 newtype = build_function_type (integer_type_node, oldtypeargs);
7378 TREE_TYPE (decl) = newtype;
7381 check_main_parameter_types (decl);
7384 if (ctype != NULL_TREE
7385 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7388 tree old_decl = check_classfn (ctype, decl,
7389 (processing_template_decl
7390 > template_class_depth (ctype))
7391 ? current_template_parms
7394 if (old_decl == error_mark_node)
7402 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7403 /* Because grokfndecl is always supposed to return a
7404 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7405 here. We depend on our callers to figure out that its
7406 really a template that's being returned. */
7407 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7409 if (DECL_STATIC_FUNCTION_P (old_decl)
7410 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7412 /* Remove the `this' parm added by grokclassfn. */
7413 revert_static_member_fn (decl);
7414 check_static_quals (decl, quals);
7416 if (DECL_ARTIFICIAL (old_decl))
7418 error ("definition of implicitly-declared %qD", old_decl);
7422 /* Since we've smashed OLD_DECL to its
7423 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7424 if (TREE_CODE (decl) == TEMPLATE_DECL)
7425 decl = DECL_TEMPLATE_RESULT (decl);
7427 /* Attempt to merge the declarations. This can fail, in
7428 the case of some invalid specialization declarations. */
7429 pushed_scope = push_scope (ctype);
7430 ok = duplicate_decls (decl, old_decl, friendp);
7432 pop_scope (pushed_scope);
7435 error ("no %q#D member function declared in class %qT",
7443 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7446 if (ctype == NULL_TREE || check)
7450 DECL_VIRTUAL_P (decl) = 1;
7455 /* decl is a FUNCTION_DECL.
7456 specifiers are the parsed virt-specifiers.
7458 Set flags to reflect the virt-specifiers.
7463 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7465 if (decl == NULL_TREE)
7467 if (specifiers & VIRT_SPEC_OVERRIDE)
7468 DECL_OVERRIDE_P (decl) = 1;
7469 if (specifiers & VIRT_SPEC_FINAL)
7470 DECL_FINAL_P (decl) = 1;
7474 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7475 the linkage that DECL will receive in the object file. */
7478 set_linkage_for_static_data_member (tree decl)
7480 /* A static data member always has static storage duration and
7481 external linkage. Note that static data members are forbidden in
7482 local classes -- the only situation in which a class has
7483 non-external linkage. */
7484 TREE_PUBLIC (decl) = 1;
7485 TREE_STATIC (decl) = 1;
7486 /* For non-template classes, static data members are always put
7487 out in exactly those files where they are defined, just as
7488 with ordinary namespace-scope variables. */
7489 if (!processing_template_decl)
7490 DECL_INTERFACE_KNOWN (decl) = 1;
7493 /* Create a VAR_DECL named NAME with the indicated TYPE.
7495 If SCOPE is non-NULL, it is the class type or namespace containing
7496 the variable. If SCOPE is NULL, the variable should is created in
7497 the innermost enclosings scope. */
7500 grokvardecl (tree type,
7502 const cp_decl_specifier_seq *declspecs,
7508 tree explicit_scope;
7510 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7512 /* Compute the scope in which to place the variable, but remember
7513 whether or not that scope was explicitly specified by the user. */
7514 explicit_scope = scope;
7517 /* An explicit "extern" specifier indicates a namespace-scope
7519 if (declspecs->storage_class == sc_extern)
7520 scope = current_decl_namespace ();
7521 else if (!at_function_scope_p ())
7522 scope = current_scope ();
7526 && (/* If the variable is a namespace-scope variable declared in a
7527 template, we need DECL_LANG_SPECIFIC. */
7528 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7529 /* Similarly for namespace-scope variables with language linkage
7531 || (TREE_CODE (scope) == NAMESPACE_DECL
7532 && current_lang_name != lang_name_cplusplus)
7533 /* Similarly for static data members. */
7535 decl = build_lang_decl (VAR_DECL, name, type);
7537 decl = build_decl (input_location, VAR_DECL, name, type);
7539 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7540 set_decl_namespace (decl, explicit_scope, 0);
7542 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7544 if (declspecs->storage_class == sc_extern)
7546 DECL_THIS_EXTERN (decl) = 1;
7547 DECL_EXTERNAL (decl) = !initialized;
7550 if (DECL_CLASS_SCOPE_P (decl))
7552 set_linkage_for_static_data_member (decl);
7553 /* This function is only called with out-of-class definitions. */
7554 DECL_EXTERNAL (decl) = 0;
7555 check_class_member_definition_namespace (decl);
7557 /* At top level, either `static' or no s.c. makes a definition
7558 (perhaps tentative), and absence of `static' makes it public. */
7559 else if (toplevel_bindings_p ())
7561 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7562 && (DECL_THIS_EXTERN (decl) || ! constp));
7563 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7565 /* Not at top level, only `static' makes a static definition. */
7568 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7569 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7572 if (declspecs->specs[(int)ds_thread])
7573 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7575 /* If the type of the decl has no linkage, make sure that we'll
7576 notice that in mark_used. */
7577 if (cxx_dialect > cxx98
7578 && decl_linkage (decl) != lk_none
7579 && DECL_LANG_SPECIFIC (decl) == NULL
7580 && !DECL_EXTERN_C_P (decl)
7581 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7582 retrofit_lang_decl (decl);
7584 if (TREE_PUBLIC (decl))
7586 /* [basic.link]: A name with no linkage (notably, the name of a class
7587 or enumeration declared in a local scope) shall not be used to
7588 declare an entity with linkage.
7590 DR 757 relaxes this restriction for C++0x. */
7591 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7592 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7595 if (TYPE_ANONYMOUS_P (t))
7597 if (DECL_EXTERN_C_P (decl))
7598 /* Allow this; it's pretty common in C. */
7602 /* DRs 132, 319 and 389 seem to indicate types with
7603 no linkage can only be used to declare extern "C"
7604 entities. Since it's not always an error in the
7605 ISO C++ 90 Standard, we only issue a warning. */
7606 warning (0, "anonymous type with no linkage used to declare "
7607 "variable %q#D with linkage", decl);
7608 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7609 warning (0, "%q+#D does not refer to the unqualified "
7610 "type, so it is not used for linkage",
7615 warning (0, "type %qT with no linkage used to declare variable "
7616 "%q#D with linkage", t, decl);
7620 DECL_INTERFACE_KNOWN (decl) = 1;
7625 /* Create and return a canonical pointer to member function type, for
7626 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7629 build_ptrmemfunc_type (tree type)
7633 tree unqualified_variant = NULL_TREE;
7635 if (type == error_mark_node)
7638 /* If a canonical type already exists for this type, use it. We use
7639 this method instead of type_hash_canon, because it only does a
7640 simple equality check on the list of field members. */
7642 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7645 /* Make sure that we always have the unqualified pointer-to-member
7647 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7649 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7651 t = make_class_type (RECORD_TYPE);
7652 xref_basetypes (t, NULL_TREE);
7654 /* Let the front end know this is a pointer to member function... */
7655 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7656 /* ... and not really a class type. */
7657 SET_CLASS_TYPE_P (t, 0);
7659 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7662 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7664 DECL_CHAIN (field) = fields;
7667 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7669 /* Zap out the name so that the back end will give us the debugging
7670 information for this anonymous RECORD_TYPE. */
7671 TYPE_NAME (t) = NULL_TREE;
7673 /* If this is not the unqualified form of this pointer-to-member
7674 type, set the TYPE_MAIN_VARIANT for this type to be the
7675 unqualified type. Since they are actually RECORD_TYPEs that are
7676 not variants of each other, we must do this manually.
7677 As we just built a new type there is no need to do yet another copy. */
7678 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7680 int type_quals = cp_type_quals (type);
7681 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7682 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7683 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7684 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7685 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7686 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7687 TREE_TYPE (TYPE_BINFO (t)) = t;
7690 /* Cache this pointer-to-member type so that we can find it again
7692 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7694 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7695 SET_TYPE_STRUCTURAL_EQUALITY (t);
7696 else if (TYPE_CANONICAL (type) != type)
7697 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7702 /* Create and return a pointer to data member type. */
7705 build_ptrmem_type (tree class_type, tree member_type)
7707 if (TREE_CODE (member_type) == METHOD_TYPE)
7709 cp_cv_quals quals = type_memfn_quals (member_type);
7710 member_type = build_memfn_type (member_type, class_type, quals);
7711 return build_ptrmemfunc_type (build_pointer_type (member_type));
7715 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7716 return build_offset_type (class_type, member_type);
7720 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7721 Check to see that the definition is valid. Issue appropriate error
7722 messages. Return 1 if the definition is particularly bad, or 0
7726 check_static_variable_definition (tree decl, tree type)
7728 /* Can't check yet if we don't know the type. */
7729 if (dependent_type_p (type))
7731 /* If DECL is declared constexpr, we'll do the appropriate checks
7732 in check_initializer. */
7733 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7735 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7737 if (literal_type_p (type))
7738 permerror (input_location,
7739 "%<constexpr%> needed for in-class initialization of "
7740 "static data member %q#D of non-integral type", decl);
7742 error ("in-class initialization of static data member %q#D of "
7743 "non-literal type", decl);
7747 /* Motion 10 at San Diego: If a static const integral data member is
7748 initialized with an integral constant expression, the initializer
7749 may appear either in the declaration (within the class), or in
7750 the definition, but not both. If it appears in the class, the
7751 member is a member constant. The file-scope definition is always
7753 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7755 error ("invalid in-class initialization of static data member "
7756 "of non-integral type %qT",
7760 else if (!CP_TYPE_CONST_P (type))
7761 error ("ISO C++ forbids in-class initialization of non-const "
7762 "static member %qD",
7764 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7765 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7766 "%qD of non-integral type %qT", decl, type);
7771 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7772 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7773 expressions out into temporary variables so that walk_tree doesn't
7774 step into them (c++/15764). */
7777 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7779 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7780 tree expr = *expr_p;
7781 if (TREE_CODE (expr) == SAVE_EXPR)
7783 tree op = TREE_OPERAND (expr, 0);
7784 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7785 if (TREE_SIDE_EFFECTS (op))
7786 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7789 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7794 /* Entry point for the above. */
7797 stabilize_vla_size (tree size)
7799 struct pointer_set_t *pset = pointer_set_create ();
7800 /* Break out any function calls into temporary variables. */
7801 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7804 /* Given the SIZE (i.e., number of elements) in an array, compute an
7805 appropriate index type for the array. If non-NULL, NAME is the
7806 name of the thing being declared. */
7809 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7814 tree abi_1_itype = NULL_TREE;
7816 if (error_operand_p (size))
7817 return error_mark_node;
7819 type = TREE_TYPE (size);
7820 /* type_dependent_expression_p? */
7821 if (!dependent_type_p (type))
7823 mark_rvalue_use (size);
7825 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7826 && TREE_SIDE_EFFECTS (size))
7827 /* In C++98, we mark a non-constant array bound with a magic
7828 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7831 size = fold_non_dependent_expr (size);
7833 if (CLASS_TYPE_P (type)
7834 && CLASSTYPE_LITERAL_P (type))
7836 size = build_expr_type_conversion (WANT_INT, size, true);
7839 if (!(complain & tf_error))
7840 return error_mark_node;
7842 error ("size of array %qD has non-integral type %qT",
7845 error ("size of array has non-integral type %qT", type);
7846 size = integer_one_node;
7848 if (size == error_mark_node)
7849 return error_mark_node;
7850 type = TREE_TYPE (size);
7851 /* We didn't support this case in GCC 3.2, so don't bother
7852 trying to model it now in ABI v1. */
7853 abi_1_itype = error_mark_node;
7856 size = maybe_constant_value (size);
7857 if (!TREE_CONSTANT (size))
7861 if (error_operand_p (size))
7862 return error_mark_node;
7864 /* The array bound must be an integer type. */
7865 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7867 if (!(complain & tf_error))
7868 return error_mark_node;
7870 error ("size of array %qD has non-integral type %qT", name, type);
7872 error ("size of array has non-integral type %qT", type);
7873 size = integer_one_node;
7874 type = TREE_TYPE (size);
7878 /* A type is dependent if it is...an array type constructed from any
7879 dependent type or whose size is specified by a constant expression
7880 that is value-dependent. */
7881 /* We can only call value_dependent_expression_p on integral constant
7882 expressions; treat non-constant expressions as dependent, too. */
7883 if (processing_template_decl
7884 && (dependent_type_p (type)
7885 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7887 /* We cannot do any checking for a SIZE that isn't known to be
7888 constant. Just build the index type and mark that it requires
7889 structural equality checks. */
7890 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7891 size, integer_one_node));
7892 TYPE_DEPENDENT_P (itype) = 1;
7893 TYPE_DEPENDENT_P_VALID (itype) = 1;
7894 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7898 if (!abi_version_at_least (2) && processing_template_decl
7899 && abi_1_itype == NULL_TREE)
7900 /* For abi-1, we handled all instances in templates the same way,
7901 even when they were non-dependent. This affects the manglings
7902 produced. So, we do the normal checking for non-dependent
7903 sizes, but at the end we'll return the same type that abi-1
7904 would have, but with TYPE_CANONICAL set to the "right"
7905 value that the current ABI would provide. */
7906 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7907 osize, integer_one_node));
7909 /* Normally, the array-bound will be a constant. */
7910 if (TREE_CODE (size) == INTEGER_CST)
7912 /* Check to see if the array bound overflowed. Make that an
7913 error, no matter how generous we're being. */
7914 constant_expression_error (size);
7916 /* An array must have a positive number of elements. */
7917 if (INT_CST_LT (size, integer_zero_node))
7919 if (!(complain & tf_error))
7920 return error_mark_node;
7922 error ("size of array %qD is negative", name);
7924 error ("size of array is negative");
7925 size = integer_one_node;
7927 /* As an extension we allow zero-sized arrays. */
7928 else if (integer_zerop (size))
7930 if (!(complain & tf_error))
7931 /* We must fail if performing argument deduction (as
7932 indicated by the state of complain), so that
7933 another substitution can be found. */
7934 return error_mark_node;
7935 else if (in_system_header)
7936 /* Allow them in system headers because glibc uses them. */;
7938 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7940 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7943 else if (TREE_CONSTANT (size)
7944 /* We don't allow VLAs at non-function scopes, or during
7945 tentative template substitution. */
7946 || !at_function_scope_p () || !(complain & tf_error))
7948 if (!(complain & tf_error))
7949 return error_mark_node;
7950 /* `(int) &fn' is not a valid array bound. */
7952 error ("size of array %qD is not an integral constant-expression",
7955 error ("size of array is not an integral constant-expression");
7956 size = integer_one_node;
7958 else if (pedantic && warn_vla != 0)
7961 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7963 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7965 else if (warn_vla > 0)
7969 "variable length array %qD is used", name);
7972 "variable length array is used");
7975 if (processing_template_decl && !TREE_CONSTANT (size))
7976 /* A variable sized array. */
7977 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7980 HOST_WIDE_INT saved_processing_template_decl;
7982 /* Compute the index of the largest element in the array. It is
7983 one less than the number of elements in the array. We save
7984 and restore PROCESSING_TEMPLATE_DECL so that computations in
7985 cp_build_binary_op will be appropriately folded. */
7986 saved_processing_template_decl = processing_template_decl;
7987 processing_template_decl = 0;
7988 itype = cp_build_binary_op (input_location,
7990 cp_convert (ssizetype, size),
7991 cp_convert (ssizetype, integer_one_node),
7992 tf_warning_or_error);
7993 itype = fold (itype);
7994 processing_template_decl = saved_processing_template_decl;
7996 if (!TREE_CONSTANT (itype))
7997 /* A variable sized array. */
7998 itype = variable_size (itype);
7999 /* Make sure that there was no overflow when creating to a signed
8000 index type. (For example, on a 32-bit machine, an array with
8001 size 2^32 - 1 is too big.) */
8002 else if (TREE_CODE (itype) == INTEGER_CST
8003 && TREE_OVERFLOW (itype))
8005 if (!(complain & tf_error))
8006 return error_mark_node;
8007 error ("overflow in array dimension");
8008 TREE_OVERFLOW (itype) = 0;
8012 /* Create and return the appropriate index type. */
8013 if (abi_1_itype && abi_1_itype != error_mark_node)
8015 tree t = build_index_type (itype);
8016 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8017 itype = abi_1_itype;
8020 itype = build_index_type (itype);
8022 /* If the index type were dependent, we would have returned early, so
8023 remember that it isn't. */
8024 TYPE_DEPENDENT_P (itype) = 0;
8025 TYPE_DEPENDENT_P_VALID (itype) = 1;
8029 /* Returns the scope (if any) in which the entity declared by
8030 DECLARATOR will be located. If the entity was declared with an
8031 unqualified name, NULL_TREE is returned. */
8034 get_scope_of_declarator (const cp_declarator *declarator)
8036 while (declarator && declarator->kind != cdk_id)
8037 declarator = declarator->declarator;
8039 /* If the declarator-id is a SCOPE_REF, the scope in which the
8040 declaration occurs is the first operand. */
8042 && declarator->u.id.qualifying_scope)
8043 return declarator->u.id.qualifying_scope;
8045 /* Otherwise, the declarator is not a qualified name; the entity will
8046 be declared in the current scope. */
8050 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8051 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8055 create_array_type_for_decl (tree name, tree type, tree size)
8057 tree itype = NULL_TREE;
8059 /* If things have already gone awry, bail now. */
8060 if (type == error_mark_node || size == error_mark_node)
8061 return error_mark_node;
8063 /* 8.3.4/1: If the type of the identifier of D contains the auto
8064 type-specifier, the program is ill-formed. */
8065 if (pedantic && type_uses_auto (type))
8066 pedwarn (input_location, OPT_pedantic,
8067 "declaration of %qD as array of %<auto%>", name);
8069 /* If there are some types which cannot be array elements,
8070 issue an error-message and return. */
8071 switch (TREE_CODE (type))
8075 error ("declaration of %qD as array of void", name);
8077 error ("creating array of void");
8078 return error_mark_node;
8082 error ("declaration of %qD as array of functions", name);
8084 error ("creating array of functions");
8085 return error_mark_node;
8087 case REFERENCE_TYPE:
8089 error ("declaration of %qD as array of references", name);
8091 error ("creating array of references");
8092 return error_mark_node;
8096 error ("declaration of %qD as array of function members", name);
8098 error ("creating array of function members");
8099 return error_mark_node;
8107 The constant expressions that specify the bounds of the arrays
8108 can be omitted only for the first member of the sequence. */
8109 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8112 error ("declaration of %qD as multidimensional array must "
8113 "have bounds for all dimensions except the first",
8116 error ("multidimensional array must have bounds for all "
8117 "dimensions except the first");
8119 return error_mark_node;
8122 /* Figure out the index type for the array. */
8124 itype = compute_array_index_type (name, size, tf_warning_or_error);
8127 T is called the array element type; this type shall not be [...] an
8128 abstract class type. */
8129 abstract_virtuals_error (name, type);
8131 return build_cplus_array_type (type, itype);
8134 /* Check that it's OK to declare a function with the indicated TYPE.
8135 SFK indicates the kind of special function (if any) that this
8136 function is. OPTYPE is the type given in a conversion operator
8137 declaration, or the class type for a constructor/destructor.
8138 Returns the actual return type of the function; that
8139 may be different than TYPE if an error occurs, or for certain
8140 special functions. */
8143 check_special_function_return_type (special_function_kind sfk,
8149 case sfk_constructor:
8151 error ("return type specification for constructor invalid");
8153 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8154 type = build_pointer_type (optype);
8156 type = void_type_node;
8159 case sfk_destructor:
8161 error ("return type specification for destructor invalid");
8162 /* We can't use the proper return type here because we run into
8163 problems with ambiguous bases and covariant returns.
8164 Java classes are left unchanged because (void *) isn't a valid
8165 Java type, and we don't want to change the Java ABI. */
8166 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8167 type = build_pointer_type (void_type_node);
8169 type = void_type_node;
8172 case sfk_conversion:
8174 error ("return type specified for %<operator %T%>", optype);
8185 /* A variable or data member (whose unqualified name is IDENTIFIER)
8186 has been declared with the indicated TYPE. If the TYPE is not
8187 acceptable, issue an error message and return a type to use for
8188 error-recovery purposes. */
8191 check_var_type (tree identifier, tree type)
8193 if (VOID_TYPE_P (type))
8196 error ("unnamed variable or field declared void");
8197 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8199 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8200 error ("variable or field %qE declared void", identifier);
8203 error ("variable or field declared void");
8204 type = error_mark_node;
8210 /* Given declspecs and a declarator (abstract or otherwise), determine
8211 the name and type of the object declared and construct a DECL node
8214 DECLSPECS points to the representation of declaration-specifier
8215 sequence that precedes declarator.
8217 DECL_CONTEXT says which syntactic context this declaration is in:
8218 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8219 FUNCDEF for a function definition. Like NORMAL but a few different
8220 error messages in each case. Return value may be zero meaning
8221 this definition is too screwy to try to parse.
8222 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8223 handle member functions (which have FIELD context).
8224 Return value may be zero meaning this definition is too screwy to
8226 PARM for a parameter declaration (either within a function prototype
8227 or before a function body). Make a PARM_DECL, or return void_type_node.
8228 TPARM for a template parameter declaration.
8229 CATCHPARM for a parameter declaration before a catch clause.
8230 TYPENAME if for a typename (in a cast or sizeof).
8231 Don't make a DECL node; just return the ..._TYPE node.
8232 FIELD for a struct or union field; make a FIELD_DECL.
8233 BITFIELD for a field with specified width.
8235 INITIALIZED is as for start_decl.
8237 ATTRLIST is a pointer to the list of attributes, which may be NULL
8238 if there are none; *ATTRLIST may be modified if attributes from inside
8239 the declarator should be applied to the declaration.
8241 When this function is called, scoping variables (such as
8242 CURRENT_CLASS_TYPE) should reflect the scope in which the
8243 declaration occurs, not the scope in which the new declaration will
8244 be placed. For example, on:
8248 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8251 Returns a DECL (if a declarator is present), a TYPE (if there is no
8252 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8256 grokdeclarator (const cp_declarator *declarator,
8257 const cp_decl_specifier_seq *declspecs,
8258 enum decl_context decl_context,
8262 tree type = NULL_TREE;
8264 int explicit_int128 = 0;
8265 int virtualp, explicitp, friendp, inlinep, staticp;
8266 int explicit_int = 0;
8267 int explicit_char = 0;
8268 int defaulted_int = 0;
8269 tree dependent_name = NULL_TREE;
8271 tree typedef_decl = NULL_TREE;
8272 const char *name = NULL;
8273 tree typedef_type = NULL_TREE;
8274 /* True if this declarator is a function definition. */
8275 bool funcdef_flag = false;
8276 cp_declarator_kind innermost_code = cdk_error;
8279 /* See the code below that used this. */
8280 tree decl_attr = NULL_TREE;
8283 /* Keep track of what sort of function is being processed
8284 so that we can warn about default return values, or explicit
8285 return values which do not match prescribed defaults. */
8286 special_function_kind sfk = sfk_none;
8288 tree dname = NULL_TREE;
8289 tree ctor_return_type = NULL_TREE;
8290 enum overload_flags flags = NO_SPECIAL;
8291 /* cv-qualifiers that apply to the declarator, for a declaration of
8292 a member function. */
8293 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8294 /* virt-specifiers that apply to the declarator, for a declaration of
8295 a member function. */
8296 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8297 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8299 tree raises = NULL_TREE;
8300 int template_count = 0;
8301 tree returned_attrs = NULL_TREE;
8302 tree parms = NULL_TREE;
8303 const cp_declarator *id_declarator;
8304 /* The unqualified name of the declarator; either an
8305 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8306 tree unqualified_id;
8307 /* The class type, if any, in which this entity is located,
8308 or NULL_TREE if none. Note that this value may be different from
8309 the current class type; for example if an attempt is made to declare
8310 "A::f" inside "B", this value will be "A". */
8311 tree ctype = current_class_type;
8312 /* The NAMESPACE_DECL for the namespace in which this entity is
8313 located. If an unqualified name is used to declare the entity,
8314 this value will be NULL_TREE, even if the entity is located at
8316 tree in_namespace = NULL_TREE;
8317 cp_storage_class storage_class;
8318 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8319 bool type_was_error_mark_node = false;
8320 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8321 bool template_type_arg = false;
8322 bool template_parm_flag = false;
8323 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8326 signed_p = declspecs->specs[(int)ds_signed];
8327 unsigned_p = declspecs->specs[(int)ds_unsigned];
8328 short_p = declspecs->specs[(int)ds_short];
8329 long_p = declspecs->specs[(int)ds_long];
8330 longlong = declspecs->specs[(int)ds_long] >= 2;
8331 explicit_int128 = declspecs->explicit_int128_p;
8332 thread_p = declspecs->specs[(int)ds_thread];
8334 if (decl_context == FUNCDEF)
8335 funcdef_flag = true, decl_context = NORMAL;
8336 else if (decl_context == MEMFUNCDEF)
8337 funcdef_flag = true, decl_context = FIELD;
8338 else if (decl_context == BITFIELD)
8339 bitfield = 1, decl_context = FIELD;
8340 else if (decl_context == TEMPLATE_TYPE_ARG)
8341 template_type_arg = true, decl_context = TYPENAME;
8342 else if (decl_context == TPARM)
8343 template_parm_flag = true, decl_context = PARM;
8345 if (initialized > 1)
8346 funcdef_flag = true;
8348 /* Look inside a declarator for the name being declared
8349 and get it as a string, for an error message. */
8350 for (id_declarator = declarator;
8352 id_declarator = id_declarator->declarator)
8354 if (id_declarator->kind != cdk_id)
8355 innermost_code = id_declarator->kind;
8357 switch (id_declarator->kind)
8360 if (id_declarator->declarator
8361 && id_declarator->declarator->kind == cdk_id)
8363 sfk = id_declarator->declarator->u.id.sfk;
8364 if (sfk == sfk_destructor)
8371 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8372 tree decl = id_declarator->u.id.unqualified_name;
8375 if (qualifying_scope)
8377 if (at_function_scope_p ())
8381 A declarator-id shall not be qualified except
8384 None of the cases are permitted in block
8386 if (qualifying_scope == global_namespace)
8387 error ("invalid use of qualified-name %<::%D%>",
8389 else if (TYPE_P (qualifying_scope))
8390 error ("invalid use of qualified-name %<%T::%D%>",
8391 qualifying_scope, decl);
8393 error ("invalid use of qualified-name %<%D::%D%>",
8394 qualifying_scope, decl);
8395 return error_mark_node;
8397 else if (TYPE_P (qualifying_scope))
8399 ctype = qualifying_scope;
8400 if (!MAYBE_CLASS_TYPE_P (ctype))
8402 error ("%q#T is not a class or a namespace", ctype);
8405 else if (innermost_code != cdk_function
8406 && current_class_type
8407 && !UNIQUELY_DERIVED_FROM_P (ctype,
8408 current_class_type))
8410 error ("type %qT is not derived from type %qT",
8411 ctype, current_class_type);
8412 return error_mark_node;
8415 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8416 in_namespace = qualifying_scope;
8418 switch (TREE_CODE (decl))
8424 if (innermost_code != cdk_function)
8426 error ("declaration of %qD as non-function", decl);
8427 return error_mark_node;
8429 else if (!qualifying_scope
8430 && !(current_class_type && at_class_scope_p ()))
8432 error ("declaration of %qD as non-member", decl);
8433 return error_mark_node;
8436 type = TREE_OPERAND (decl, 0);
8438 type = constructor_name (type);
8439 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8444 case TEMPLATE_ID_EXPR:
8446 tree fns = TREE_OPERAND (decl, 0);
8449 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8451 gcc_assert (is_overloaded_fn (dname));
8452 dname = DECL_NAME (get_first_fn (dname));
8457 case IDENTIFIER_NODE:
8458 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8461 if (C_IS_RESERVED_WORD (dname))
8463 error ("declarator-id missing; using reserved word %qD",
8465 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8467 else if (!IDENTIFIER_TYPENAME_P (dname))
8468 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8471 gcc_assert (flags == NO_SPECIAL);
8472 flags = TYPENAME_FLAG;
8473 ctor_return_type = TREE_TYPE (dname);
8474 sfk = sfk_conversion;
8475 if (is_typename_at_global_scope (dname))
8476 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8478 name = "<invalid operator>";
8495 return error_mark_node;
8500 if (id_declarator->kind == cdk_id)
8506 The declarator in a function-definition shall have the form
8507 D1 ( parameter-declaration-clause) ... */
8508 if (funcdef_flag && innermost_code != cdk_function)
8510 error ("function definition does not declare parameters");
8511 return error_mark_node;
8514 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8515 && innermost_code != cdk_function
8516 && ! (ctype && !declspecs->any_specifiers_p))
8518 error ("declaration of %qD as non-function", dname);
8519 return error_mark_node;
8522 if (dname && IDENTIFIER_OPNAME_P (dname))
8524 if (declspecs->specs[(int)ds_typedef])
8526 error ("declaration of %qD as %<typedef%>", dname);
8527 return error_mark_node;
8529 else if (decl_context == PARM || decl_context == CATCHPARM)
8531 error ("declaration of %qD as parameter", dname);
8532 return error_mark_node;
8536 /* Anything declared one level down from the top level
8537 must be one of the parameters of a function
8538 (because the body is at least two levels down). */
8540 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8541 by not allowing C++ class definitions to specify their parameters
8542 with xdecls (must be spec.d in the parmlist).
8544 Since we now wait to push a class scope until we are sure that
8545 we are in a legitimate method context, we must set oldcname
8546 explicitly (since current_class_name is not yet alive).
8548 We also want to avoid calling this a PARM if it is in a namespace. */
8550 if (decl_context == NORMAL && !toplevel_bindings_p ())
8552 cp_binding_level *b = current_binding_level;
8553 current_binding_level = b->level_chain;
8554 if (current_binding_level != 0 && toplevel_bindings_p ())
8555 decl_context = PARM;
8556 current_binding_level = b;
8560 name = decl_context == PARM ? "parameter" : "type name";
8562 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8564 error ("%<constexpr%> cannot appear in a typedef declaration");
8565 return error_mark_node;
8568 /* If there were multiple types specified in the decl-specifier-seq,
8569 issue an error message. */
8570 if (declspecs->multiple_types_p)
8572 error ("two or more data types in declaration of %qs", name);
8573 return error_mark_node;
8576 if (declspecs->conflicting_specifiers_p)
8578 error ("conflicting specifiers in declaration of %qs", name);
8579 return error_mark_node;
8582 /* Extract the basic type from the decl-specifier-seq. */
8583 type = declspecs->type;
8584 if (type == error_mark_node)
8587 type_was_error_mark_node = true;
8589 /* If the entire declaration is itself tagged as deprecated then
8590 suppress reports of deprecated items. */
8591 if (type && TREE_DEPRECATED (type)
8592 && deprecated_state != DEPRECATED_SUPPRESS)
8593 warn_deprecated_use (type, NULL_TREE);
8594 if (type && TREE_CODE (type) == TYPE_DECL)
8596 typedef_decl = type;
8597 type = TREE_TYPE (typedef_decl);
8598 if (TREE_DEPRECATED (type)
8599 && DECL_ARTIFICIAL (typedef_decl)
8600 && deprecated_state != DEPRECATED_SUPPRESS)
8601 warn_deprecated_use (type, NULL_TREE);
8603 /* No type at all: default to `int', and set DEFAULTED_INT
8604 because it was not a user-defined typedef. */
8605 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8607 /* These imply 'int'. */
8608 type = integer_type_node;
8612 explicit_int = declspecs->explicit_int_p;
8613 explicit_char = declspecs->explicit_char_p;
8616 /* See the code below that used this. */
8618 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8620 typedef_type = type;
8623 if (sfk != sfk_conversion)
8624 ctor_return_type = ctype;
8626 if (sfk != sfk_none)
8627 type = check_special_function_return_type (sfk, type,
8629 else if (type == NULL_TREE)
8635 /* We handle `main' specially here, because 'main () { }' is so
8636 common. With no options, it is allowed. With -Wreturn-type,
8637 it is a warning. It is only an error with -pedantic-errors. */
8638 is_main = (funcdef_flag
8639 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8640 && MAIN_NAME_P (dname)
8641 && ctype == NULL_TREE
8642 && in_namespace == NULL_TREE
8643 && current_namespace == global_namespace);
8645 if (type_was_error_mark_node)
8646 /* We've already issued an error, don't complain more. */;
8647 else if (in_system_header || flag_ms_extensions)
8648 /* Allow it, sigh. */;
8650 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8652 pedwarn (input_location, OPT_pedantic,
8653 "ISO C++ forbids declaration of %qs with no type", name);
8655 warning (OPT_Wreturn_type,
8656 "ISO C++ forbids declaration of %qs with no type", name);
8658 type = integer_type_node;
8663 if (explicit_int128)
8665 if (int128_integer_type_node == NULL_TREE)
8667 error ("%<__int128%> is not supported by this target");
8668 explicit_int128 = false;
8670 else if (pedantic && ! in_system_header)
8671 pedwarn (input_location, OPT_pedantic,
8672 "ISO C++ does not support %<__int128%> for %qs", name);
8675 /* Now process the modifiers that were specified
8676 and check for invalid combinations. */
8678 /* Long double is a special combination. */
8679 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8682 type = cp_build_qualified_type (long_double_type_node,
8683 cp_type_quals (type));
8686 /* Check all other uses of type modifiers. */
8688 if (unsigned_p || signed_p || long_p || short_p)
8692 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8693 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8694 else if (signed_p && unsigned_p)
8695 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8696 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8697 error ("%<long long%> invalid for %qs", name);
8698 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8699 error ("%<long%> invalid for %qs", name);
8700 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8701 error ("%<short%> invalid for %qs", name);
8702 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8703 error ("%<long%> or %<short%> invalid for %qs", name);
8704 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8705 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8706 else if ((long_p || short_p) && explicit_char)
8707 error ("%<long%> or %<short%> specified with char for %qs", name);
8708 else if (long_p && short_p)
8709 error ("%<long%> and %<short%> specified together for %qs", name);
8710 else if (type == char16_type_node || type == char32_type_node)
8712 if (signed_p || unsigned_p)
8713 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8714 else if (short_p || long_p)
8715 error ("%<short%> or %<long%> invalid for %qs", name);
8720 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8722 pedwarn (input_location, OPT_pedantic,
8723 "long, short, signed or unsigned used invalidly for %qs",
8725 if (flag_pedantic_errors)
8730 /* Discard the type modifiers if they are invalid. */
8741 /* Decide whether an integer type is signed or not.
8742 Optionally treat bitfields as signed by default. */
8746 It is implementation-defined whether a plain (neither
8747 explicitly signed or unsigned) char, short, int, or long
8748 bit-field is signed or unsigned.
8750 Naturally, we extend this to long long as well. Note that
8751 this does not include wchar_t. */
8752 || (bitfield && !flag_signed_bitfields
8754 /* A typedef for plain `int' without `signed' can be
8755 controlled just like plain `int', but a typedef for
8756 `signed int' cannot be so controlled. */
8758 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8759 && TREE_CODE (type) == INTEGER_TYPE
8760 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8762 if (explicit_int128)
8763 type = int128_unsigned_type_node;
8765 type = long_long_unsigned_type_node;
8767 type = long_unsigned_type_node;
8769 type = short_unsigned_type_node;
8770 else if (type == char_type_node)
8771 type = unsigned_char_type_node;
8772 else if (typedef_decl)
8773 type = unsigned_type_for (type);
8775 type = unsigned_type_node;
8777 else if (signed_p && type == char_type_node)
8778 type = signed_char_type_node;
8779 else if (explicit_int128)
8780 type = int128_integer_type_node;
8782 type = long_long_integer_type_node;
8784 type = long_integer_type_node;
8786 type = short_integer_type_node;
8788 if (declspecs->specs[(int)ds_complex])
8790 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8791 error ("complex invalid for %qs", name);
8792 /* If we just have "complex", it is equivalent to
8793 "complex double", but if any modifiers at all are specified it is
8794 the complex form of TYPE. E.g, "complex short" is
8795 "complex short int". */
8796 else if (defaulted_int && ! longlong && ! explicit_int128
8797 && ! (long_p || short_p || signed_p || unsigned_p))
8798 type = complex_double_type_node;
8799 else if (type == integer_type_node)
8800 type = complex_integer_type_node;
8801 else if (type == float_type_node)
8802 type = complex_float_type_node;
8803 else if (type == double_type_node)
8804 type = complex_double_type_node;
8805 else if (type == long_double_type_node)
8806 type = complex_long_double_type_node;
8808 type = build_complex_type (type);
8811 type_quals = TYPE_UNQUALIFIED;
8812 if (declspecs->specs[(int)ds_const])
8813 type_quals |= TYPE_QUAL_CONST;
8814 if (declspecs->specs[(int)ds_volatile])
8815 type_quals |= TYPE_QUAL_VOLATILE;
8816 if (declspecs->specs[(int)ds_restrict])
8817 type_quals |= TYPE_QUAL_RESTRICT;
8818 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8819 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8822 type_quals |= cp_type_quals (type);
8823 type = cp_build_qualified_type_real
8824 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8825 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8826 /* We might have ignored or rejected some of the qualifiers. */
8827 type_quals = cp_type_quals (type);
8830 inlinep = !! declspecs->specs[(int)ds_inline];
8831 virtualp = !! declspecs->specs[(int)ds_virtual];
8832 explicitp = !! declspecs->specs[(int)ds_explicit];
8834 storage_class = declspecs->storage_class;
8835 if (storage_class == sc_static)
8836 staticp = 1 + (decl_context == FIELD);
8838 if (virtualp && staticp == 2)
8840 error ("member %qD cannot be declared both virtual and static", dname);
8841 storage_class = sc_none;
8844 friendp = !! declspecs->specs[(int)ds_friend];
8846 if (dependent_name && !friendp)
8848 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8849 return error_mark_node;
8852 /* Issue errors about use of storage classes for parameters. */
8853 if (decl_context == PARM)
8855 if (declspecs->specs[(int)ds_typedef])
8857 error ("typedef declaration invalid in parameter declaration");
8858 return error_mark_node;
8860 else if (template_parm_flag && storage_class != sc_none)
8862 error ("storage class specified for template parameter %qs", name);
8863 return error_mark_node;
8865 else if (storage_class == sc_static
8866 || storage_class == sc_extern
8868 error ("storage class specifiers invalid in parameter declarations");
8870 /* Function parameters cannot be constexpr. If we saw one, moan
8871 and pretend it wasn't there. */
8874 error ("a parameter cannot be declared %<constexpr%>");
8879 /* Give error if `virtual' is used outside of class declaration. */
8881 && (current_class_name == NULL_TREE || decl_context != FIELD))
8883 error ("%<virtual%> outside class declaration");
8887 /* Static anonymous unions are dealt with here. */
8888 if (staticp && decl_context == TYPENAME
8890 && ANON_AGGR_TYPE_P (declspecs->type))
8891 decl_context = FIELD;
8893 /* Warn about storage classes that are invalid for certain
8894 kinds of declarations (parameters, typenames, etc.). */
8897 && storage_class != sc_extern
8898 && storage_class != sc_static)
8899 || declspecs->specs[(int)ds_typedef]))
8901 error ("multiple storage classes in declaration of %qs", name);
8904 if (decl_context != NORMAL
8905 && ((storage_class != sc_none
8906 && storage_class != sc_mutable)
8909 if ((decl_context == PARM || decl_context == CATCHPARM)
8910 && (storage_class == sc_register
8911 || storage_class == sc_auto))
8913 else if (declspecs->specs[(int)ds_typedef])
8915 else if (decl_context == FIELD
8916 /* C++ allows static class elements. */
8917 && storage_class == sc_static)
8918 /* C++ also allows inlines and signed and unsigned elements,
8919 but in those cases we don't come in here. */
8923 if (decl_context == FIELD)
8924 error ("storage class specified for %qs", name);
8927 if (decl_context == PARM || decl_context == CATCHPARM)
8928 error ("storage class specified for parameter %qs", name);
8930 error ("storage class specified for typename");
8932 if (storage_class == sc_register
8933 || storage_class == sc_auto
8934 || storage_class == sc_extern
8936 storage_class = sc_none;
8939 else if (storage_class == sc_extern && funcdef_flag
8940 && ! toplevel_bindings_p ())
8941 error ("nested function %qs declared %<extern%>", name);
8942 else if (toplevel_bindings_p ())
8944 if (storage_class == sc_auto)
8945 error ("top-level declaration of %qs specifies %<auto%>", name);
8948 && storage_class != sc_extern
8949 && storage_class != sc_static)
8951 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8956 if (storage_class && friendp)
8958 error ("storage class specifiers invalid in friend function declarations");
8959 storage_class = sc_none;
8964 unqualified_id = NULL_TREE;
8967 unqualified_id = id_declarator->u.id.unqualified_name;
8968 switch (TREE_CODE (unqualified_id))
8971 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8972 if (TYPE_P (unqualified_id))
8973 unqualified_id = constructor_name (unqualified_id);
8976 case IDENTIFIER_NODE:
8977 case TEMPLATE_ID_EXPR:
8985 /* Determine the type of the entity declared by recurring on the
8987 for (; declarator; declarator = declarator->declarator)
8989 const cp_declarator *inner_declarator;
8992 if (type == error_mark_node)
8993 return error_mark_node;
8995 attrs = declarator->attributes;
9001 if (declarator == NULL || declarator->kind == cdk_id)
9002 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9003 if (declarator->kind == cdk_function)
9004 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9005 if (declarator->kind == cdk_array)
9006 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9007 returned_attrs = decl_attributes (&type,
9008 chainon (returned_attrs, attrs),
9012 if (declarator->kind == cdk_id)
9015 inner_declarator = declarator->declarator;
9017 switch (declarator->kind)
9020 type = create_array_type_for_decl (dname, type,
9021 declarator->u.array.bounds);
9029 /* Declaring a function type.
9030 Make sure we have a valid type for the function to return. */
9032 if (type_quals != TYPE_UNQUALIFIED)
9034 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9035 warning (OPT_Wignored_qualifiers,
9036 "type qualifiers ignored on function return type");
9037 /* We now know that the TYPE_QUALS don't apply to the
9038 decl, but to its return type. */
9039 type_quals = TYPE_UNQUALIFIED;
9041 errmsg = targetm.invalid_return_type (type);
9045 type = integer_type_node;
9048 /* Error about some types functions can't return. */
9050 if (TREE_CODE (type) == FUNCTION_TYPE)
9052 error ("%qs declared as function returning a function", name);
9053 return error_mark_node;
9055 if (TREE_CODE (type) == ARRAY_TYPE)
9057 error ("%qs declared as function returning an array", name);
9058 return error_mark_node;
9061 /* Pick up type qualifiers which should be applied to `this'. */
9062 memfn_quals = declarator->u.function.qualifiers;
9063 /* Pick up virt-specifiers. */
9064 virt_specifiers = declarator->u.function.virt_specifiers;
9065 /* Pick up the exception specifications. */
9066 raises = declarator->u.function.exception_specification;
9067 /* If the exception-specification is ill-formed, let's pretend
9068 there wasn't one. */
9069 if (raises == error_mark_node)
9072 /* Say it's a definition only for the CALL_EXPR
9073 closest to the identifier. */
9074 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9076 /* Handle a late-specified return type. */
9079 if (type_uses_auto (type))
9081 if (!declarator->u.function.late_return_type)
9083 error ("%qs function uses %<auto%> type specifier without"
9084 " late return type", name);
9085 return error_mark_node;
9087 else if (!is_auto (type))
9089 error ("%qs function with late return type has"
9090 " %qT as its type rather than plain %<auto%>",
9092 return error_mark_node;
9095 else if (declarator->u.function.late_return_type)
9097 error ("%qs function with late return type not declared"
9098 " with %<auto%> type specifier", name);
9099 return error_mark_node;
9102 type = splice_late_return_type
9103 (type, declarator->u.function.late_return_type);
9104 if (type == error_mark_node)
9105 return error_mark_node;
9107 if (ctype == NULL_TREE
9108 && decl_context == FIELD
9110 && (friendp == 0 || dname == current_class_name))
9111 ctype = current_class_type;
9113 if (ctype && (sfk == sfk_constructor
9114 || sfk == sfk_destructor))
9116 /* We are within a class's scope. If our declarator name
9117 is the same as the class name, and we are defining
9118 a function, then it is a constructor/destructor, and
9119 therefore returns a void type. */
9121 /* ISO C++ 12.4/2. A destructor may not be declared
9122 const or volatile. A destructor may not be
9125 ISO C++ 12.1. A constructor may not be declared
9126 const or volatile. A constructor may not be
9127 virtual. A constructor may not be static. */
9129 error ((flags == DTOR_FLAG)
9130 ? "destructor cannot be static member function"
9131 : "constructor cannot be static member function");
9134 error ((flags == DTOR_FLAG)
9135 ? "destructors may not be cv-qualified"
9136 : "constructors may not be cv-qualified");
9137 memfn_quals = TYPE_UNQUALIFIED;
9140 if (decl_context == FIELD
9141 && !member_function_or_else (ctype,
9144 return error_mark_node;
9146 if (flags != DTOR_FLAG)
9148 /* It's a constructor. */
9153 permerror (input_location, "constructors cannot be declared virtual");
9156 if (decl_context == FIELD
9157 && sfk != sfk_constructor)
9158 return error_mark_node;
9160 if (decl_context == FIELD)
9166 error ("can%'t initialize friend function %qs", name);
9169 /* Cannot be both friend and virtual. */
9170 error ("virtual functions cannot be friends");
9173 if (decl_context == NORMAL)
9174 error ("friend declaration not in class definition");
9175 if (current_function_decl && funcdef_flag)
9176 error ("can%'t define friend function %qs in a local "
9180 else if (ctype && sfk == sfk_conversion)
9184 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9189 arg_types = grokparms (declarator->u.function.parameters,
9192 if (inner_declarator
9193 && inner_declarator->kind == cdk_id
9194 && inner_declarator->u.id.sfk == sfk_destructor
9195 && arg_types != void_list_node)
9197 error ("destructors may not have parameters");
9198 arg_types = void_list_node;
9202 type = build_function_type (type, arg_types);
9209 /* Filter out pointers-to-references and references-to-references.
9210 We can get these if a TYPE_DECL is used. */
9212 if (TREE_CODE (type) == REFERENCE_TYPE)
9214 if (declarator->kind != cdk_reference)
9216 error ("cannot declare pointer to %q#T", type);
9217 type = TREE_TYPE (type);
9220 /* In C++0x, we allow reference to reference declarations
9221 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9222 and template type arguments [14.3.1/4 temp.arg.type]. The
9223 check for direct reference to reference declarations, which
9224 are still forbidden, occurs below. Reasoning behind the change
9225 can be found in DR106, DR540, and the rvalue reference
9227 else if (cxx_dialect == cxx98)
9229 error ("cannot declare reference to %q#T", type);
9230 type = TREE_TYPE (type);
9233 else if (VOID_TYPE_P (type))
9235 if (declarator->kind == cdk_reference)
9236 error ("cannot declare reference to %q#T", type);
9237 else if (declarator->kind == cdk_ptrmem)
9238 error ("cannot declare pointer to %q#T member", type);
9241 /* We now know that the TYPE_QUALS don't apply to the decl,
9242 but to the target of the pointer. */
9243 type_quals = TYPE_UNQUALIFIED;
9245 if (declarator->kind == cdk_ptrmem
9246 && (TREE_CODE (type) == FUNCTION_TYPE
9247 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9249 memfn_quals |= type_memfn_quals (type);
9250 type = build_memfn_type (type,
9251 declarator->u.pointer.class_type,
9253 if (type == error_mark_node)
9254 return error_mark_node;
9255 memfn_quals = TYPE_UNQUALIFIED;
9258 if (TREE_CODE (type) == FUNCTION_TYPE
9259 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9260 error (declarator->kind == cdk_reference
9261 ? G_("cannot declare reference to qualified function type %qT")
9262 : G_("cannot declare pointer to qualified function type %qT"),
9265 /* When the pointed-to type involves components of variable size,
9266 care must be taken to ensure that the size evaluation code is
9267 emitted early enough to dominate all the possible later uses
9268 and late enough for the variables on which it depends to have
9271 This is expected to happen automatically when the pointed-to
9272 type has a name/declaration of it's own, but special attention
9273 is required if the type is anonymous.
9275 We handle the NORMAL and FIELD contexts here by inserting a
9276 dummy statement that just evaluates the size at a safe point
9277 and ensures it is not deferred until e.g. within a deeper
9278 conditional context (c++/43555).
9280 We expect nothing to be needed here for PARM or TYPENAME.
9281 Evaluating the size at this point for TYPENAME would
9282 actually be incorrect, as we might be in the middle of an
9283 expression with side effects on the pointed-to type size
9284 "arguments" prior to the pointer declaration point and the
9285 size evaluation could end up prior to the side effects. */
9287 if (!TYPE_NAME (type)
9288 && (decl_context == NORMAL || decl_context == FIELD)
9289 && at_function_scope_p ()
9290 && variably_modified_type_p (type, NULL_TREE))
9292 /* First break out any side-effects. */
9293 stabilize_vla_size (TYPE_SIZE (type));
9294 /* And then force evaluation of the SAVE_EXPR. */
9295 finish_expr_stmt (TYPE_SIZE (type));
9298 if (declarator->kind == cdk_reference)
9300 /* In C++0x, the type we are creating a reference to might be
9301 a typedef which is itself a reference type. In that case,
9302 we follow the reference collapsing rules in
9303 [7.1.3/8 dcl.typedef] to create the final reference type:
9305 "If a typedef TD names a type that is a reference to a type
9306 T, an attempt to create the type 'lvalue reference to cv TD'
9307 creates the type 'lvalue reference to T,' while an attempt
9308 to create the type "rvalue reference to cv TD' creates the
9311 if (VOID_TYPE_P (type))
9312 /* We already gave an error. */;
9313 else if (TREE_CODE (type) == REFERENCE_TYPE)
9315 if (declarator->u.reference.rvalue_ref)
9316 /* Leave type alone. */;
9318 type = cp_build_reference_type (TREE_TYPE (type), false);
9321 type = cp_build_reference_type
9322 (type, declarator->u.reference.rvalue_ref);
9324 /* In C++0x, we need this check for direct reference to
9325 reference declarations, which are forbidden by
9326 [8.3.2/5 dcl.ref]. Reference to reference declarations
9327 are only allowed indirectly through typedefs and template
9328 type arguments. Example:
9330 void foo(int & &); // invalid ref-to-ref decl
9332 typedef int & int_ref;
9333 void foo(int_ref &); // valid ref-to-ref decl
9335 if (inner_declarator && inner_declarator->kind == cdk_reference)
9336 error ("cannot declare reference to %q#T, which is not "
9337 "a typedef or a template type argument", type);
9339 else if (TREE_CODE (type) == METHOD_TYPE)
9340 type = build_ptrmemfunc_type (build_pointer_type (type));
9341 else if (declarator->kind == cdk_ptrmem)
9343 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9345 if (declarator->u.pointer.class_type == error_mark_node)
9346 /* We will already have complained. */
9347 type = error_mark_node;
9349 type = build_ptrmem_type (declarator->u.pointer.class_type,
9353 type = build_pointer_type (type);
9355 /* Process a list of type modifier keywords (such as
9356 const or volatile) that were given inside the `*' or `&'. */
9358 if (declarator->u.pointer.qualifiers)
9361 = cp_build_qualified_type (type,
9362 declarator->u.pointer.qualifiers);
9363 type_quals = cp_type_quals (type);
9376 /* We need to stabilize side-effects in VLA sizes for regular array
9377 declarations too, not just pointers to arrays. */
9378 if (type != error_mark_node && !TYPE_NAME (type)
9379 && (decl_context == NORMAL || decl_context == FIELD)
9380 && at_function_scope_p ()
9381 && variably_modified_type_p (type, NULL_TREE))
9382 stabilize_vla_size (TYPE_SIZE (type));
9384 /* A `constexpr' specifier used in an object declaration declares
9385 the object as `const'. */
9386 if (constexpr_p && innermost_code != cdk_function)
9388 if (type_quals & TYPE_QUAL_CONST)
9389 error ("both %<const%> and %<constexpr%> cannot be used here");
9390 if (type_quals & TYPE_QUAL_VOLATILE)
9391 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9392 if (TREE_CODE (type) != REFERENCE_TYPE)
9394 type_quals |= TYPE_QUAL_CONST;
9395 type = cp_build_qualified_type (type, type_quals);
9399 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9400 && TREE_CODE (type) != FUNCTION_TYPE
9401 && TREE_CODE (type) != METHOD_TYPE)
9403 error ("template-id %qD used as a declarator",
9405 unqualified_id = dname;
9408 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9409 qualified with a class-name, turn it into a METHOD_TYPE, unless
9410 we know that the function is static. We take advantage of this
9411 opportunity to do other processing that pertains to entities
9412 explicitly declared to be class members. Note that if DECLARATOR
9413 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9414 would not have exited the loop above. */
9416 && declarator->u.id.qualifying_scope
9417 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9421 ctype = declarator->u.id.qualifying_scope;
9422 ctype = TYPE_MAIN_VARIANT (ctype);
9424 while (t != NULL_TREE && CLASS_TYPE_P (t))
9426 /* You're supposed to have one `template <...>' for every
9427 template class, but you don't need one for a full
9428 specialization. For example:
9430 template <class T> struct S{};
9431 template <> struct S<int> { void f(); };
9432 void S<int>::f () {}
9434 is correct; there shouldn't be a `template <>' for the
9435 definition of `S<int>::f'. */
9436 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9437 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9438 /* T is an explicit (not partial) specialization. All
9439 containing classes must therefore also be explicitly
9442 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9443 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9444 template_count += 1;
9446 t = TYPE_MAIN_DECL (t);
9447 t = DECL_CONTEXT (t);
9450 if (ctype == current_class_type)
9454 permerror (input_location, "member functions are implicitly friends of their class");
9458 permerror (declarator->id_loc,
9459 "extra qualification %<%T::%> on member %qs",
9462 else if (/* If the qualifying type is already complete, then we
9463 can skip the following checks. */
9464 !COMPLETE_TYPE_P (ctype)
9465 && (/* If the function is being defined, then
9466 qualifying type must certainly be complete. */
9468 /* A friend declaration of "T::f" is OK, even if
9469 "T" is a template parameter. But, if this
9470 function is not a friend, the qualifying type
9472 || (!friendp && !CLASS_TYPE_P (ctype))
9473 /* For a declaration, the type need not be
9474 complete, if either it is dependent (since there
9475 is no meaningful definition of complete in that
9476 case) or the qualifying class is currently being
9478 || !(dependent_type_p (ctype)
9479 || currently_open_class (ctype)))
9480 /* Check that the qualifying type is complete. */
9481 && !complete_type_or_else (ctype, NULL_TREE))
9482 return error_mark_node;
9483 else if (TREE_CODE (type) == FUNCTION_TYPE)
9485 if (current_class_type
9486 && (!friendp || funcdef_flag))
9489 ? "cannot define member function %<%T::%s%> within %<%T%>"
9490 : "cannot declare member function %<%T::%s%> within %<%T%>",
9491 ctype, name, current_class_type);
9492 return error_mark_node;
9495 else if (declspecs->specs[(int)ds_typedef]
9496 && current_class_type)
9498 error ("cannot declare member %<%T::%s%> within %qT",
9499 ctype, name, current_class_type);
9500 return error_mark_node;
9504 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9505 ctype = current_class_type;
9507 /* Now TYPE has the actual type. */
9512 *attrlist = chainon (returned_attrs, *attrlist);
9514 attrlist = &returned_attrs;
9517 /* Handle parameter packs. */
9518 if (parameter_pack_p)
9520 if (decl_context == PARM)
9521 /* Turn the type into a pack expansion.*/
9522 type = make_pack_expansion (type);
9524 error ("non-parameter %qs cannot be a parameter pack", name);
9527 /* Did array size calculations overflow? */
9529 if (TREE_CODE (type) == ARRAY_TYPE
9530 && COMPLETE_TYPE_P (type)
9531 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9532 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9534 error ("size of array %qs is too large", name);
9535 /* If we proceed with the array type as it is, we'll eventually
9536 crash in tree_low_cst(). */
9537 type = error_mark_node;
9540 if ((decl_context == FIELD || decl_context == PARM)
9541 && !processing_template_decl
9542 && variably_modified_type_p (type, NULL_TREE))
9544 if (decl_context == FIELD)
9545 error ("data member may not have variably modified type %qT", type);
9547 error ("parameter may not have variably modified type %qT", type);
9548 type = error_mark_node;
9551 if (explicitp == 1 || (explicitp && friendp))
9553 /* [dcl.fct.spec] The explicit specifier shall only be used in
9554 declarations of constructors within a class definition. */
9555 error ("only declarations of constructors can be %<explicit%>");
9559 if (storage_class == sc_mutable)
9561 if (decl_context != FIELD || friendp)
9563 error ("non-member %qs cannot be declared %<mutable%>", name);
9564 storage_class = sc_none;
9566 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9568 error ("non-object member %qs cannot be declared %<mutable%>", name);
9569 storage_class = sc_none;
9571 else if (TREE_CODE (type) == FUNCTION_TYPE
9572 || TREE_CODE (type) == METHOD_TYPE)
9574 error ("function %qs cannot be declared %<mutable%>", name);
9575 storage_class = sc_none;
9579 error ("static %qs cannot be declared %<mutable%>", name);
9580 storage_class = sc_none;
9582 else if (type_quals & TYPE_QUAL_CONST)
9584 error ("const %qs cannot be declared %<mutable%>", name);
9585 storage_class = sc_none;
9587 else if (TREE_CODE (type) == REFERENCE_TYPE)
9589 permerror (input_location, "reference %qs cannot be declared "
9590 "%<mutable%>", name);
9591 storage_class = sc_none;
9595 /* If this is declaring a typedef name, return a TYPE_DECL. */
9596 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9600 /* Note that the grammar rejects storage classes
9601 in typenames, fields or parameters. */
9602 if (current_lang_name == lang_name_java)
9603 TYPE_FOR_JAVA (type) = 1;
9605 /* This declaration:
9607 typedef void f(int) const;
9609 declares a function type which is not a member of any
9610 particular class, but which is cv-qualified; for
9611 example "f S::*" declares a pointer to a const-qualified
9612 member function of S. We record the cv-qualification in the
9614 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9616 type = apply_memfn_quals (type, memfn_quals);
9618 /* We have now dealt with these qualifiers. */
9619 memfn_quals = TYPE_UNQUALIFIED;
9622 if (type_uses_auto (type))
9624 error ("typedef declared %<auto%>");
9625 type = error_mark_node;
9628 if (decl_context == FIELD)
9629 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9631 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9632 if (id_declarator && declarator->u.id.qualifying_scope) {
9633 error_at (DECL_SOURCE_LOCATION (decl),
9634 "typedef name may not be a nested-name-specifier");
9635 TREE_TYPE (decl) = error_mark_node;
9638 if (decl_context != FIELD)
9640 if (!current_function_decl)
9641 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9642 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9643 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9644 (current_function_decl)))
9645 /* The TYPE_DECL is "abstract" because there will be
9646 clones of this constructor/destructor, and there will
9647 be copies of this TYPE_DECL generated in those
9649 DECL_ABSTRACT (decl) = 1;
9651 else if (constructor_name_p (unqualified_id, current_class_type))
9652 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9653 "as enclosing class",
9656 /* If the user declares "typedef struct {...} foo" then the
9657 struct will have an anonymous name. Fill that name in now.
9658 Nothing can refer to it, so nothing needs know about the name
9660 if (type != error_mark_node
9663 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9664 && TYPE_ANONYMOUS_P (type)
9665 && declspecs->type_definition_p
9666 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9670 /* Replace the anonymous name with the real name everywhere. */
9671 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9673 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9674 /* We do not rename the debug info representing the
9675 anonymous tagged type because the standard says in
9676 [dcl.typedef] that the naming applies only for
9677 linkage purposes. */
9678 /*debug_hooks->set_name (t, decl);*/
9679 TYPE_NAME (t) = decl;
9682 if (TYPE_LANG_SPECIFIC (type))
9683 TYPE_WAS_ANONYMOUS (type) = 1;
9685 /* If this is a typedef within a template class, the nested
9686 type is a (non-primary) template. The name for the
9687 template needs updating as well. */
9688 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9689 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9690 = TYPE_IDENTIFIER (type);
9692 /* Adjust linkage now that we aren't anonymous anymore. */
9693 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9694 determine_visibility (TYPE_MAIN_DECL (type));
9696 /* FIXME remangle member functions; member functions of a
9697 type with external linkage have external linkage. */
9701 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9702 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9704 bad_specifiers (decl, BSP_TYPE, virtualp,
9705 memfn_quals != TYPE_UNQUALIFIED,
9706 inlinep, friendp, raises != NULL_TREE);
9711 /* Detect the case of an array type of unspecified size
9712 which came, as such, direct from a typedef name.
9713 We must copy the type, so that the array's domain can be
9714 individually set by the object's initializer. */
9716 if (type && typedef_type
9717 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9718 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9719 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9721 /* Detect where we're using a typedef of function type to declare a
9722 function. PARMS will not be set, so we must create it now. */
9724 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9726 tree decls = NULL_TREE;
9729 for (args = TYPE_ARG_TYPES (type);
9730 args && args != void_list_node;
9731 args = TREE_CHAIN (args))
9733 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9735 DECL_CHAIN (decl) = decls;
9739 parms = nreverse (decls);
9741 if (decl_context != TYPENAME)
9743 /* A cv-qualifier-seq shall only be part of the function type
9744 for a non-static member function. [8.3.5/4 dcl.fct] */
9745 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9746 && (current_class_type == NULL_TREE || staticp) )
9749 ? G_("qualified function types cannot be used to "
9750 "declare static member functions")
9751 : G_("qualified function types cannot be used to "
9752 "declare free functions"));
9753 type = TYPE_MAIN_VARIANT (type);
9756 /* The qualifiers on the function type become the qualifiers on
9757 the non-static member function. */
9758 memfn_quals |= type_memfn_quals (type);
9759 type_quals = TYPE_UNQUALIFIED;
9763 /* If this is a type name (such as, in a cast or sizeof),
9764 compute the type and return it now. */
9766 if (decl_context == TYPENAME)
9768 /* Note that the grammar rejects storage classes
9769 in typenames, fields or parameters. */
9770 if (type_quals != TYPE_UNQUALIFIED)
9771 type_quals = TYPE_UNQUALIFIED;
9773 /* Special case: "friend class foo" looks like a TYPENAME context. */
9776 if (type_quals != TYPE_UNQUALIFIED)
9778 error ("type qualifiers specified for friend class declaration");
9779 type_quals = TYPE_UNQUALIFIED;
9783 error ("%<inline%> specified for friend class declaration");
9789 /* Don't allow friend declaration without a class-key. */
9790 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9791 permerror (input_location, "template parameters cannot be friends");
9792 else if (TREE_CODE (type) == TYPENAME_TYPE)
9793 permerror (input_location, "friend declaration requires class-key, "
9794 "i.e. %<friend class %T::%D%>",
9795 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9797 permerror (input_location, "friend declaration requires class-key, "
9798 "i.e. %<friend %#T%>",
9802 /* Only try to do this stuff if we didn't already give up. */
9803 if (type != integer_type_node)
9805 /* A friendly class? */
9806 if (current_class_type)
9807 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9810 error ("trying to make class %qT a friend of global scope",
9813 type = void_type_node;
9816 else if (memfn_quals)
9818 if (ctype == NULL_TREE
9819 && TREE_CODE (type) == METHOD_TYPE)
9820 ctype = TYPE_METHOD_BASETYPE (type);
9823 type = build_memfn_type (type, ctype, memfn_quals);
9824 /* Core issue #547: need to allow this in template type args. */
9825 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9826 type = apply_memfn_quals (type, memfn_quals);
9828 error ("invalid qualifiers on non-member function type");
9833 else if (unqualified_id == NULL_TREE && decl_context != PARM
9834 && decl_context != CATCHPARM
9835 && TREE_CODE (type) != UNION_TYPE
9838 error ("abstract declarator %qT used as declaration", type);
9839 return error_mark_node;
9842 /* Only functions may be declared using an operator-function-id. */
9844 && IDENTIFIER_OPNAME_P (unqualified_id)
9845 && TREE_CODE (type) != FUNCTION_TYPE
9846 && TREE_CODE (type) != METHOD_TYPE)
9848 error ("declaration of %qD as non-function", unqualified_id);
9849 return error_mark_node;
9852 /* We don't check parameter types here because we can emit a better
9853 error message later. */
9854 if (decl_context != PARM)
9856 type = check_var_type (unqualified_id, type);
9857 if (type == error_mark_node)
9858 return error_mark_node;
9861 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9862 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9864 if (decl_context == PARM || decl_context == CATCHPARM)
9866 if (ctype || in_namespace)
9867 error ("cannot use %<::%> in parameter declaration");
9869 if (type_uses_auto (type))
9871 error ("parameter declared %<auto%>");
9872 type = error_mark_node;
9875 /* A parameter declared as an array of T is really a pointer to T.
9876 One declared as a function is really a pointer to a function.
9877 One declared as a member is really a pointer to member. */
9879 if (TREE_CODE (type) == ARRAY_TYPE)
9881 /* Transfer const-ness of array into that of type pointed to. */
9882 type = build_pointer_type (TREE_TYPE (type));
9883 type_quals = TYPE_UNQUALIFIED;
9885 else if (TREE_CODE (type) == FUNCTION_TYPE)
9886 type = build_pointer_type (type);
9889 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9890 && !NEW_DELETE_OPNAME_P (unqualified_id))
9892 cp_cv_quals real_quals = memfn_quals;
9893 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9894 real_quals |= TYPE_QUAL_CONST;
9895 type = build_memfn_type (type, ctype, real_quals);
9901 if (decl_context == PARM)
9903 decl = cp_build_parm_decl (unqualified_id, type);
9905 bad_specifiers (decl, BSP_PARM, virtualp,
9906 memfn_quals != TYPE_UNQUALIFIED,
9907 inlinep, friendp, raises != NULL_TREE);
9909 else if (decl_context == FIELD)
9911 /* The C99 flexible array extension. */
9912 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9913 && TYPE_DOMAIN (type) == NULL_TREE)
9915 tree itype = compute_array_index_type (dname, integer_zero_node,
9916 tf_warning_or_error);
9917 type = build_cplus_array_type (TREE_TYPE (type), itype);
9920 if (type == error_mark_node)
9922 /* Happens when declaring arrays of sizes which
9923 are error_mark_node, for example. */
9926 else if (in_namespace && !friendp)
9928 /* Something like struct S { int N::j; }; */
9929 error ("invalid use of %<::%>");
9930 return error_mark_node;
9932 else if (TREE_CODE (type) == FUNCTION_TYPE
9933 || TREE_CODE (type) == METHOD_TYPE)
9936 tree function_context;
9940 /* This should never happen in pure C++ (the check
9941 could be an assert). It could happen in
9942 Objective-C++ if someone writes invalid code that
9943 uses a function declaration for an instance
9944 variable or property (instance variables and
9945 properties are parsed as FIELD_DECLs, but they are
9946 part of an Objective-C class, not a C++ class).
9947 That code is invalid and is caught by this
9951 error ("declaration of function %qD in invalid context",
9953 return error_mark_node;
9956 /* ``A union may [ ... ] not [ have ] virtual functions.''
9958 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9960 error ("function %qD declared virtual inside a union",
9962 return error_mark_node;
9965 if (NEW_DELETE_OPNAME_P (unqualified_id))
9969 error ("%qD cannot be declared virtual, since it "
9977 /* Check that the name used for a destructor makes sense. */
9978 if (sfk == sfk_destructor)
9980 tree uqname = id_declarator->u.id.unqualified_name;
9984 gcc_assert (friendp);
9985 error ("expected qualified name in friend declaration "
9986 "for destructor %qD", uqname);
9987 return error_mark_node;
9990 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9992 error ("declaration of %qD as member of %qT",
9994 return error_mark_node;
9998 error ("a destructor cannot be %<constexpr%>");
9999 return error_mark_node;
10002 else if (sfk == sfk_constructor && friendp && !ctype)
10004 error ("expected qualified name in friend declaration "
10005 "for constructor %qD",
10006 id_declarator->u.id.unqualified_name);
10007 return error_mark_node;
10010 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10011 function_context = (ctype != NULL_TREE) ?
10012 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10013 publicp = (! friendp || ! staticp)
10014 && function_context == NULL_TREE;
10015 decl = grokfndecl (ctype, type,
10016 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10017 ? unqualified_id : dname,
10020 virtualp, flags, memfn_quals, raises,
10021 friendp ? -1 : 0, friendp, publicp,
10022 inlinep | (2 * constexpr_p),
10024 funcdef_flag, template_count, in_namespace,
10025 attrlist, declarator->id_loc);
10026 decl = set_virt_specifiers (decl, virt_specifiers);
10027 if (decl == NULL_TREE)
10028 return error_mark_node;
10030 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10031 /* The decl and setting of decl_attr is also turned off. */
10032 decl = build_decl_attribute_variant (decl, decl_attr);
10035 /* [class.conv.ctor]
10037 A constructor declared without the function-specifier
10038 explicit that can be called with a single parameter
10039 specifies a conversion from the type of its first
10040 parameter to the type of its class. Such a constructor
10041 is called a converting constructor. */
10042 if (explicitp == 2)
10043 DECL_NONCONVERTING_P (decl) = 1;
10045 else if (!staticp && !dependent_type_p (type)
10046 && !COMPLETE_TYPE_P (complete_type (type))
10047 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10049 if (unqualified_id)
10050 error ("field %qD has incomplete type", unqualified_id);
10052 error ("name %qT has incomplete type", type);
10054 /* If we're instantiating a template, tell them which
10055 instantiation made the field's type be incomplete. */
10056 if (current_class_type
10057 && TYPE_NAME (current_class_type)
10058 && IDENTIFIER_TEMPLATE (current_class_name)
10060 && declspecs->type == type)
10061 error (" in instantiation of template %qT",
10062 current_class_type);
10064 return error_mark_node;
10070 error ("%qE is neither function nor member function; "
10071 "cannot be declared friend", unqualified_id);
10079 /* Friends are treated specially. */
10080 if (ctype == current_class_type)
10081 ; /* We already issued a permerror. */
10082 else if (decl && DECL_NAME (decl))
10084 if (template_class_depth (current_class_type) == 0)
10086 decl = check_explicit_specialization
10087 (unqualified_id, decl, template_count,
10088 2 * funcdef_flag + 4);
10089 if (decl == error_mark_node)
10090 return error_mark_node;
10093 decl = do_friend (ctype, unqualified_id, decl,
10099 return error_mark_node;
10102 /* Structure field. It may not be a function, except for C++. */
10104 if (decl == NULL_TREE)
10108 /* C++ allows static class members. All other work
10109 for this is done by grokfield. */
10110 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10111 set_linkage_for_static_data_member (decl);
10112 /* Even if there is an in-class initialization, DECL
10113 is considered undefined until an out-of-class
10114 definition is provided. */
10115 DECL_EXTERNAL (decl) = 1;
10118 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10120 if (constexpr_p && !initialized)
10122 error ("constexpr static data member %qD must have an "
10123 "initializer", decl);
10124 constexpr_p = false;
10131 error ("non-static data member %qE declared %<constexpr%>",
10133 constexpr_p = false;
10135 decl = build_decl (input_location,
10136 FIELD_DECL, unqualified_id, type);
10137 DECL_NONADDRESSABLE_P (decl) = bitfield;
10138 if (bitfield && !unqualified_id)
10139 TREE_NO_WARNING (decl) = 1;
10141 if (storage_class == sc_mutable)
10143 DECL_MUTABLE_P (decl) = 1;
10144 storage_class = sc_none;
10148 /* An attempt is being made to initialize a non-static
10149 member. This is new in C++11. */
10150 maybe_warn_cpp0x (CPP0X_NSDMI);
10153 bad_specifiers (decl, BSP_FIELD, virtualp,
10154 memfn_quals != TYPE_UNQUALIFIED,
10155 inlinep, friendp, raises != NULL_TREE);
10158 else if (TREE_CODE (type) == FUNCTION_TYPE
10159 || TREE_CODE (type) == METHOD_TYPE)
10161 tree original_name;
10164 if (!unqualified_id)
10165 return error_mark_node;
10167 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10168 original_name = dname;
10170 original_name = unqualified_id;
10172 if (storage_class == sc_auto)
10173 error ("storage class %<auto%> invalid for function %qs", name);
10174 else if (storage_class == sc_register)
10175 error ("storage class %<register%> invalid for function %qs", name);
10177 error ("storage class %<__thread%> invalid for function %qs", name);
10179 if (virt_specifiers)
10180 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10181 /* Function declaration not at top level.
10182 Storage classes other than `extern' are not allowed
10183 and `extern' makes no difference. */
10184 if (! toplevel_bindings_p ()
10185 && (storage_class == sc_static
10186 || declspecs->specs[(int)ds_inline])
10189 if (storage_class == sc_static)
10190 pedwarn (input_location, OPT_pedantic,
10191 "%<static%> specified invalid for function %qs "
10192 "declared out of global scope", name);
10194 pedwarn (input_location, OPT_pedantic,
10195 "%<inline%> specifier invalid for function %qs "
10196 "declared out of global scope", name);
10199 if (ctype == NULL_TREE)
10203 error ("virtual non-class function %qs", name);
10206 else if (sfk == sfk_constructor
10207 || sfk == sfk_destructor)
10209 error (funcdef_flag
10210 ? "%qs defined in a non-class scope"
10211 : "%qs declared in a non-class scope", name);
10216 /* Record presence of `static'. */
10217 publicp = (ctype != NULL_TREE
10218 || storage_class == sc_extern
10219 || storage_class != sc_static);
10221 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10222 virtualp, flags, memfn_quals, raises,
10224 publicp, inlinep | (2 * constexpr_p), sfk,
10226 template_count, in_namespace, attrlist,
10227 declarator->id_loc);
10228 if (decl == NULL_TREE)
10229 return error_mark_node;
10233 int invalid_static = 0;
10235 /* Don't allow a static member function in a class, and forbid
10236 declaring main to be static. */
10237 if (TREE_CODE (type) == METHOD_TYPE)
10239 permerror (input_location, "cannot declare member function %qD to have "
10240 "static linkage", decl);
10241 invalid_static = 1;
10243 else if (current_function_decl)
10245 /* FIXME need arm citation */
10246 error ("cannot declare static function inside another function");
10247 invalid_static = 1;
10250 if (invalid_static)
10253 storage_class = sc_none;
10259 /* It's a variable. */
10261 /* An uninitialized decl with `extern' is a reference. */
10262 decl = grokvardecl (type, unqualified_id,
10265 (type_quals & TYPE_QUAL_CONST) != 0,
10266 ctype ? ctype : in_namespace);
10267 bad_specifiers (decl, BSP_VAR, virtualp,
10268 memfn_quals != TYPE_UNQUALIFIED,
10269 inlinep, friendp, raises != NULL_TREE);
10273 DECL_CONTEXT (decl) = ctype;
10276 permerror (input_location, "%<static%> may not be used when defining "
10277 "(as opposed to declaring) a static data member");
10279 storage_class = sc_none;
10281 if (storage_class == sc_register && TREE_STATIC (decl))
10283 error ("static member %qD declared %<register%>", decl);
10284 storage_class = sc_none;
10286 if (storage_class == sc_extern && pedantic)
10288 pedwarn (input_location, OPT_pedantic,
10289 "cannot explicitly declare member %q#D to have "
10290 "extern linkage", decl);
10291 storage_class = sc_none;
10294 else if (constexpr_p && DECL_EXTERNAL (decl))
10296 error ("declaration of constexpr variable %qD is not a definition",
10298 constexpr_p = false;
10302 if (storage_class == sc_extern && initialized && !funcdef_flag)
10304 if (toplevel_bindings_p ())
10306 /* It's common practice (and completely valid) to have a const
10307 be initialized and declared extern. */
10308 if (!(type_quals & TYPE_QUAL_CONST))
10309 warning (0, "%qs initialized and declared %<extern%>", name);
10313 error ("%qs has both %<extern%> and initializer", name);
10314 return error_mark_node;
10318 /* Record `register' declaration for warnings on &
10319 and in case doing stupid register allocation. */
10321 if (storage_class == sc_register)
10322 DECL_REGISTER (decl) = 1;
10323 else if (storage_class == sc_extern)
10324 DECL_THIS_EXTERN (decl) = 1;
10325 else if (storage_class == sc_static)
10326 DECL_THIS_STATIC (decl) = 1;
10328 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10329 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10330 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10332 /* Record constancy and volatility on the DECL itself . There's
10333 no need to do this when processing a template; we'll do this
10334 for the instantiated declaration based on the type of DECL. */
10335 if (!processing_template_decl)
10336 cp_apply_type_quals_to_decl (type_quals, decl);
10342 /* Subroutine of start_function. Ensure that each of the parameter
10343 types (as listed in PARMS) is complete, as is required for a
10344 function definition. */
10347 require_complete_types_for_parms (tree parms)
10349 for (; parms; parms = DECL_CHAIN (parms))
10351 if (dependent_type_p (TREE_TYPE (parms)))
10353 if (!VOID_TYPE_P (TREE_TYPE (parms))
10354 && complete_type_or_else (TREE_TYPE (parms), parms))
10356 relayout_decl (parms);
10357 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10360 /* grokparms or complete_type_or_else will have already issued
10362 TREE_TYPE (parms) = error_mark_node;
10366 /* Returns nonzero if T is a local variable. */
10369 local_variable_p (const_tree t)
10371 if ((TREE_CODE (t) == VAR_DECL
10372 /* A VAR_DECL with a context that is a _TYPE is a static data
10374 && !TYPE_P (CP_DECL_CONTEXT (t))
10375 /* Any other non-local variable must be at namespace scope. */
10376 && !DECL_NAMESPACE_SCOPE_P (t))
10377 || (TREE_CODE (t) == PARM_DECL))
10383 /* Like local_variable_p, but suitable for use as a tree-walking
10387 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10388 void *data ATTRIBUTE_UNUSED)
10390 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10392 else if (TYPE_P (*tp))
10393 *walk_subtrees = 0;
10399 /* Check that ARG, which is a default-argument expression for a
10400 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10401 something goes wrong. DECL may also be a _TYPE node, rather than a
10402 DECL, if there is no DECL available. */
10405 check_default_argument (tree decl, tree arg)
10410 if (TREE_CODE (arg) == DEFAULT_ARG)
10411 /* We get a DEFAULT_ARG when looking at an in-class declaration
10412 with a default argument. Ignore the argument for now; we'll
10413 deal with it after the class is complete. */
10422 decl_type = TREE_TYPE (decl);
10424 if (arg == error_mark_node
10425 || decl == error_mark_node
10426 || TREE_TYPE (arg) == error_mark_node
10427 || decl_type == error_mark_node)
10428 /* Something already went wrong. There's no need to check
10430 return error_mark_node;
10432 /* [dcl.fct.default]
10434 A default argument expression is implicitly converted to the
10436 if (!TREE_TYPE (arg)
10437 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10440 error ("default argument for %q#D has type %qT",
10441 decl, TREE_TYPE (arg));
10443 error ("default argument for parameter of type %qT has type %qT",
10444 decl_type, TREE_TYPE (arg));
10446 return error_mark_node;
10449 /* [dcl.fct.default]
10451 Local variables shall not be used in default argument
10454 The keyword `this' shall not be used in a default argument of a
10455 member function. */
10456 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10459 error ("default argument %qE uses local variable %qD", arg, var);
10460 return error_mark_node;
10467 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10470 type_is_deprecated (tree type)
10472 enum tree_code code;
10473 if (TREE_DEPRECATED (type))
10475 if (TYPE_NAME (type)
10476 && TREE_DEPRECATED (TYPE_NAME (type)))
10479 /* Do warn about using typedefs to a deprecated class. */
10480 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10481 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10483 code = TREE_CODE (type);
10485 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10486 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10487 || code == METHOD_TYPE || code == ARRAY_TYPE)
10488 return type_is_deprecated (TREE_TYPE (type));
10490 if (TYPE_PTRMEMFUNC_P (type))
10491 return type_is_deprecated
10492 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10497 /* Decode the list of parameter types for a function type.
10498 Given the list of things declared inside the parens,
10499 return a list of types.
10501 If this parameter does not end with an ellipsis, we append
10504 *PARMS is set to the chain of PARM_DECLs created. */
10507 grokparms (tree parmlist, tree *parms)
10509 tree result = NULL_TREE;
10510 tree decls = NULL_TREE;
10514 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10516 tree type = NULL_TREE;
10517 tree init = TREE_PURPOSE (parm);
10518 tree decl = TREE_VALUE (parm);
10519 const char *errmsg;
10521 if (parm == void_list_node)
10524 if (! decl || TREE_TYPE (decl) == error_mark_node)
10527 type = TREE_TYPE (decl);
10528 if (VOID_TYPE_P (type))
10530 if (same_type_p (type, void_type_node)
10531 && DECL_SELF_REFERENCE_P (type)
10532 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10533 /* this is a parmlist of `(void)', which is ok. */
10535 cxx_incomplete_type_error (decl, type);
10536 /* It's not a good idea to actually create parameters of
10537 type `void'; other parts of the compiler assume that a
10538 void type terminates the parameter list. */
10539 type = error_mark_node;
10540 TREE_TYPE (decl) = error_mark_node;
10543 if (type != error_mark_node
10544 && TYPE_FOR_JAVA (type)
10545 && MAYBE_CLASS_TYPE_P (type))
10547 error ("parameter %qD has Java class type", decl);
10548 type = error_mark_node;
10549 TREE_TYPE (decl) = error_mark_node;
10553 if (type != error_mark_node
10554 && (errmsg = targetm.invalid_parameter_type (type)))
10557 type = error_mark_node;
10558 TREE_TYPE (decl) = error_mark_node;
10561 if (type != error_mark_node)
10563 if (deprecated_state != DEPRECATED_SUPPRESS)
10565 tree deptype = type_is_deprecated (type);
10567 warn_deprecated_use (deptype, NULL_TREE);
10570 /* Top-level qualifiers on the parameters are
10571 ignored for function types. */
10572 type = cp_build_qualified_type (type, 0);
10573 if (TREE_CODE (type) == METHOD_TYPE)
10575 error ("parameter %qD invalidly declared method type", decl);
10576 type = build_pointer_type (type);
10577 TREE_TYPE (decl) = type;
10579 else if (abstract_virtuals_error (decl, type))
10580 any_error = 1; /* Seems like a good idea. */
10581 else if (POINTER_TYPE_P (type))
10583 /* [dcl.fct]/6, parameter types cannot contain pointers
10584 (references) to arrays of unknown bound. */
10585 tree t = TREE_TYPE (type);
10586 int ptr = TYPE_PTR_P (type);
10590 if (TYPE_PTR_P (t))
10592 else if (TREE_CODE (t) != ARRAY_TYPE)
10594 else if (!TYPE_DOMAIN (t))
10598 if (TREE_CODE (t) == ARRAY_TYPE)
10600 ? G_("parameter %qD includes pointer to array of "
10601 "unknown bound %qT")
10602 : G_("parameter %qD includes reference to array of "
10603 "unknown bound %qT"),
10609 else if (init && !processing_template_decl)
10610 init = check_default_argument (decl, init);
10613 DECL_CHAIN (decl) = decls;
10615 result = tree_cons (init, type, result);
10617 decls = nreverse (decls);
10618 result = nreverse (result);
10620 result = chainon (result, void_list_node);
10627 /* D is a constructor or overloaded `operator='.
10629 Let T be the class in which D is declared. Then, this function
10632 -1 if D's is an ill-formed constructor or copy assignment operator
10633 whose first parameter is of type `T'.
10634 0 if D is not a copy constructor or copy assignment
10636 1 if D is a copy constructor or copy assignment operator whose
10637 first parameter is a reference to non-const qualified T.
10638 2 if D is a copy constructor or copy assignment operator whose
10639 first parameter is a reference to const qualified T.
10641 This function can be used as a predicate. Positive values indicate
10642 a copy constructor and nonzero values indicate a copy assignment
10646 copy_fn_p (const_tree d)
10652 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10654 if (TREE_CODE (d) == TEMPLATE_DECL
10655 || (DECL_TEMPLATE_INFO (d)
10656 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10657 /* Instantiations of template member functions are never copy
10658 functions. Note that member functions of templated classes are
10659 represented as template functions internally, and we must
10660 accept those as copy functions. */
10663 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10667 arg_type = TREE_VALUE (args);
10668 if (arg_type == error_mark_node)
10671 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10673 /* Pass by value copy assignment operator. */
10676 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10677 && !TYPE_REF_IS_RVALUE (arg_type)
10678 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10680 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10686 args = TREE_CHAIN (args);
10688 if (args && args != void_list_node && !TREE_PURPOSE (args))
10689 /* There are more non-optional args. */
10695 /* D is a constructor or overloaded `operator='.
10697 Let T be the class in which D is declared. Then, this function
10698 returns true when D is a move constructor or move assignment
10699 operator, false otherwise. */
10702 move_fn_p (const_tree d)
10706 bool result = false;
10708 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10710 if (cxx_dialect == cxx98)
10711 /* There are no move constructors if we are in C++98 mode. */
10714 if (TREE_CODE (d) == TEMPLATE_DECL
10715 || (DECL_TEMPLATE_INFO (d)
10716 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10717 /* Instantiations of template member functions are never copy
10718 functions. Note that member functions of templated classes are
10719 represented as template functions internally, and we must
10720 accept those as copy functions. */
10723 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10727 arg_type = TREE_VALUE (args);
10728 if (arg_type == error_mark_node)
10731 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10732 && TYPE_REF_IS_RVALUE (arg_type)
10733 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10737 args = TREE_CHAIN (args);
10739 if (args && args != void_list_node && !TREE_PURPOSE (args))
10740 /* There are more non-optional args. */
10746 /* Remember any special properties of member function DECL. */
10749 grok_special_member_properties (tree decl)
10753 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10756 class_type = DECL_CONTEXT (decl);
10757 if (DECL_CONSTRUCTOR_P (decl))
10759 int ctor = copy_fn_p (decl);
10761 if (!DECL_ARTIFICIAL (decl))
10762 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10768 A non-template constructor for class X is a copy
10769 constructor if its first parameter is of type X&, const
10770 X&, volatile X& or const volatile X&, and either there
10771 are no other parameters or else all other parameters have
10772 default arguments. */
10773 TYPE_HAS_COPY_CTOR (class_type) = 1;
10774 if (user_provided_p (decl))
10775 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10777 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10779 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10781 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10782 if (user_provided_p (decl))
10783 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10785 else if (move_fn_p (decl) && user_provided_p (decl))
10786 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10787 else if (is_list_ctor (decl))
10788 TYPE_HAS_LIST_CTOR (class_type) = 1;
10790 if (DECL_DECLARED_CONSTEXPR_P (decl)
10791 && !copy_fn_p (decl) && !move_fn_p (decl))
10792 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10794 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10798 A non-template assignment operator for class X is a copy
10799 assignment operator if its parameter is of type X, X&, const
10800 X&, volatile X& or const volatile X&. */
10802 int assop = copy_fn_p (decl);
10806 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10807 if (user_provided_p (decl))
10808 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10810 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10812 else if (move_fn_p (decl) && user_provided_p (decl))
10813 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10815 /* Destructors are handled in check_methods. */
10818 /* Check a constructor DECL has the correct form. Complains
10819 if the class has a constructor of the form X(X). */
10822 grok_ctor_properties (const_tree ctype, const_tree decl)
10824 int ctor_parm = copy_fn_p (decl);
10830 A declaration of a constructor for a class X is ill-formed if
10831 its first parameter is of type (optionally cv-qualified) X
10832 and either there are no other parameters or else all other
10833 parameters have default arguments.
10835 We *don't* complain about member template instantiations that
10836 have this form, though; they can occur as we try to decide
10837 what constructor to use during overload resolution. Since
10838 overload resolution will never prefer such a constructor to
10839 the non-template copy constructor (which is either explicitly
10840 or implicitly defined), there's no need to worry about their
10841 existence. Theoretically, they should never even be
10842 instantiated, but that's hard to forestall. */
10843 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10851 /* An operator with this code is unary, but can also be binary. */
10854 ambi_op_p (enum tree_code code)
10856 return (code == INDIRECT_REF
10857 || code == ADDR_EXPR
10858 || code == UNARY_PLUS_EXPR
10859 || code == NEGATE_EXPR
10860 || code == PREINCREMENT_EXPR
10861 || code == PREDECREMENT_EXPR);
10864 /* An operator with this name can only be unary. */
10867 unary_op_p (enum tree_code code)
10869 return (code == TRUTH_NOT_EXPR
10870 || code == BIT_NOT_EXPR
10871 || code == COMPONENT_REF
10872 || code == TYPE_EXPR);
10875 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10876 errors are issued for invalid declarations. */
10879 grok_op_properties (tree decl, bool complain)
10881 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10883 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10884 tree name = DECL_NAME (decl);
10885 enum tree_code operator_code;
10890 /* Count the number of arguments and check for ellipsis. */
10891 for (argtype = argtypes, arity = 0;
10892 argtype && argtype != void_list_node;
10893 argtype = TREE_CHAIN (argtype))
10895 ellipsis_p = !argtype;
10897 class_type = DECL_CONTEXT (decl);
10898 if (class_type && !CLASS_TYPE_P (class_type))
10899 class_type = NULL_TREE;
10901 if (DECL_CONV_FN_P (decl))
10902 operator_code = TYPE_EXPR;
10906 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10907 if (ansi_opname (CODE) == name) \
10909 operator_code = (CODE); \
10912 else if (ansi_assopname (CODE) == name) \
10914 operator_code = (CODE); \
10915 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10919 #include "operators.def"
10920 #undef DEF_OPERATOR
10922 gcc_unreachable ();
10925 gcc_assert (operator_code != MAX_TREE_CODES);
10926 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10929 switch (operator_code)
10932 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10936 TYPE_GETS_DELETE (class_type) |= 1;
10940 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10943 case VEC_DELETE_EXPR:
10944 TYPE_GETS_DELETE (class_type) |= 2;
10951 /* [basic.std.dynamic.allocation]/1:
10953 A program is ill-formed if an allocation function is declared
10954 in a namespace scope other than global scope or declared static
10957 The same also holds true for deallocation functions. */
10958 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10959 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10961 if (DECL_NAMESPACE_SCOPE_P (decl))
10963 if (CP_DECL_CONTEXT (decl) != global_namespace)
10965 error ("%qD may not be declared within a namespace", decl);
10968 else if (!TREE_PUBLIC (decl))
10970 error ("%qD may not be declared as static", decl);
10976 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10978 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10979 DECL_IS_OPERATOR_NEW (decl) = 1;
10981 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10982 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10985 /* An operator function must either be a non-static member function
10986 or have at least one parameter of a class, a reference to a class,
10987 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10988 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10990 if (operator_code == TYPE_EXPR
10991 || operator_code == CALL_EXPR
10992 || operator_code == COMPONENT_REF
10993 || operator_code == ARRAY_REF
10994 || operator_code == NOP_EXPR)
10996 error ("%qD must be a nonstatic member function", decl);
11003 if (DECL_STATIC_FUNCTION_P (decl))
11005 error ("%qD must be either a non-static member "
11006 "function or a non-member function", decl);
11010 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11012 tree arg = non_reference (TREE_VALUE (p));
11013 if (arg == error_mark_node)
11016 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11017 because these checks are performed even on
11018 template functions. */
11019 if (MAYBE_CLASS_TYPE_P (arg)
11020 || TREE_CODE (arg) == ENUMERAL_TYPE)
11024 if (!p || p == void_list_node)
11027 error ("%qD must have an argument of class or "
11028 "enumerated type", decl);
11034 /* There are no restrictions on the arguments to an overloaded
11036 if (operator_code == CALL_EXPR)
11039 /* Warn about conversion operators that will never be used. */
11040 if (IDENTIFIER_TYPENAME_P (name)
11041 && ! DECL_TEMPLATE_INFO (decl)
11043 /* Warn only declaring the function; there is no need to
11044 warn again about out-of-class definitions. */
11045 && class_type == current_class_type)
11047 tree t = TREE_TYPE (name);
11048 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11051 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11053 if (TREE_CODE (t) == VOID_TYPE)
11054 warning (OPT_Wconversion,
11056 ? G_("conversion to a reference to void "
11057 "will never use a type conversion operator")
11058 : G_("conversion to void "
11059 "will never use a type conversion operator"));
11060 else if (class_type)
11062 if (t == class_type)
11063 warning (OPT_Wconversion,
11065 ? G_("conversion to a reference to the same type "
11066 "will never use a type conversion operator")
11067 : G_("conversion to the same type "
11068 "will never use a type conversion operator"));
11069 /* Don't force t to be complete here. */
11070 else if (MAYBE_CLASS_TYPE_P (t)
11071 && COMPLETE_TYPE_P (t)
11072 && DERIVED_FROM_P (t, class_type))
11073 warning (OPT_Wconversion,
11075 ? G_("conversion to a reference to a base class "
11076 "will never use a type conversion operator")
11077 : G_("conversion to a base class "
11078 "will never use a type conversion operator"));
11083 if (operator_code == COND_EXPR)
11086 error ("ISO C++ prohibits overloading operator ?:");
11089 else if (ellipsis_p)
11091 error ("%qD must not have variable number of arguments", decl);
11094 else if (ambi_op_p (operator_code))
11097 /* We pick the one-argument operator codes by default, so
11098 we don't have to change anything. */
11100 else if (arity == 2)
11102 /* If we thought this was a unary operator, we now know
11103 it to be a binary operator. */
11104 switch (operator_code)
11107 operator_code = MULT_EXPR;
11111 operator_code = BIT_AND_EXPR;
11114 case UNARY_PLUS_EXPR:
11115 operator_code = PLUS_EXPR;
11119 operator_code = MINUS_EXPR;
11122 case PREINCREMENT_EXPR:
11123 operator_code = POSTINCREMENT_EXPR;
11126 case PREDECREMENT_EXPR:
11127 operator_code = POSTDECREMENT_EXPR;
11131 gcc_unreachable ();
11134 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11136 if ((operator_code == POSTINCREMENT_EXPR
11137 || operator_code == POSTDECREMENT_EXPR)
11138 && ! processing_template_decl
11139 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11142 error ("postfix %qD must take %<int%> as its argument",
11145 error ("postfix %qD must take %<int%> as its second "
11153 error ("%qD must take either zero or one argument", decl);
11155 error ("%qD must take either one or two arguments", decl);
11159 /* More Effective C++ rule 6. */
11161 && (operator_code == POSTINCREMENT_EXPR
11162 || operator_code == POSTDECREMENT_EXPR
11163 || operator_code == PREINCREMENT_EXPR
11164 || operator_code == PREDECREMENT_EXPR))
11166 tree arg = TREE_VALUE (argtypes);
11167 tree ret = TREE_TYPE (TREE_TYPE (decl));
11168 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11169 arg = TREE_TYPE (arg);
11170 arg = TYPE_MAIN_VARIANT (arg);
11171 if (operator_code == PREINCREMENT_EXPR
11172 || operator_code == PREDECREMENT_EXPR)
11174 if (TREE_CODE (ret) != REFERENCE_TYPE
11175 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11177 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11178 build_reference_type (arg));
11182 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11183 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11187 else if (unary_op_p (operator_code))
11192 error ("%qD must take %<void%>", decl);
11194 error ("%qD must take exactly one argument", decl);
11198 else /* if (binary_op_p (operator_code)) */
11203 error ("%qD must take exactly one argument", decl);
11205 error ("%qD must take exactly two arguments", decl);
11209 /* More Effective C++ rule 7. */
11211 && (operator_code == TRUTH_ANDIF_EXPR
11212 || operator_code == TRUTH_ORIF_EXPR
11213 || operator_code == COMPOUND_EXPR))
11214 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11218 /* Effective C++ rule 23. */
11221 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11222 && (operator_code == PLUS_EXPR
11223 || operator_code == MINUS_EXPR
11224 || operator_code == TRUNC_DIV_EXPR
11225 || operator_code == MULT_EXPR
11226 || operator_code == TRUNC_MOD_EXPR)
11227 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11228 warning (OPT_Weffc__, "%qD should return by value", decl);
11230 /* [over.oper]/8 */
11231 for (; argtypes && argtypes != void_list_node;
11232 argtypes = TREE_CHAIN (argtypes))
11233 if (TREE_PURPOSE (argtypes))
11235 TREE_PURPOSE (argtypes) = NULL_TREE;
11236 if (operator_code == POSTINCREMENT_EXPR
11237 || operator_code == POSTDECREMENT_EXPR)
11239 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11244 error ("%qD cannot have default arguments", decl);
11252 /* Return a string giving the keyword associate with CODE. */
11254 static const char *
11255 tag_name (enum tag_types code)
11267 case typename_type:
11270 gcc_unreachable ();
11274 /* Name lookup in an elaborated-type-specifier (after the keyword
11275 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11276 elaborated-type-specifier is invalid, issue a diagnostic and return
11277 error_mark_node; otherwise, return the *_TYPE to which it referred.
11278 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11281 check_elaborated_type_specifier (enum tag_types tag_code,
11283 bool allow_template_p)
11289 struct S { struct S *p; };
11291 name lookup will find the TYPE_DECL for the implicit "S::S"
11292 typedef. Adjust for that here. */
11293 if (DECL_SELF_REFERENCE_P (decl))
11294 decl = TYPE_NAME (TREE_TYPE (decl));
11296 type = TREE_TYPE (decl);
11298 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11299 is false for this case as well. */
11300 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11302 error ("using template type parameter %qT after %qs",
11303 type, tag_name (tag_code));
11304 return error_mark_node;
11308 If the identifier resolves to a typedef-name or a template
11309 type-parameter, the elaborated-type-specifier is ill-formed.
11311 In other words, the only legitimate declaration to use in the
11312 elaborated type specifier is the implicit typedef created when
11313 the type is declared. */
11314 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11315 && !DECL_SELF_REFERENCE_P (decl)
11316 && tag_code != typename_type)
11318 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11319 error ("%q+D has a previous declaration here", decl);
11320 return error_mark_node;
11322 else if (TREE_CODE (type) != RECORD_TYPE
11323 && TREE_CODE (type) != UNION_TYPE
11324 && tag_code != enum_type
11325 && tag_code != typename_type)
11327 error ("%qT referred to as %qs", type, tag_name (tag_code));
11328 error ("%q+T has a previous declaration here", type);
11329 return error_mark_node;
11331 else if (TREE_CODE (type) != ENUMERAL_TYPE
11332 && tag_code == enum_type)
11334 error ("%qT referred to as enum", type);
11335 error ("%q+T has a previous declaration here", type);
11336 return error_mark_node;
11338 else if (!allow_template_p
11339 && TREE_CODE (type) == RECORD_TYPE
11340 && CLASSTYPE_IS_TEMPLATE (type))
11342 /* If a class template appears as elaborated type specifier
11343 without a template header such as:
11345 template <class T> class C {};
11346 void f(class C); // No template header here
11348 then the required template argument is missing. */
11349 error ("template argument required for %<%s %T%>",
11350 tag_name (tag_code),
11351 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11352 return error_mark_node;
11358 /* Lookup NAME in elaborate type specifier in scope according to
11359 SCOPE and issue diagnostics if necessary.
11360 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11361 found, and ERROR_MARK_NODE for type error. */
11364 lookup_and_check_tag (enum tag_types tag_code, tree name,
11365 tag_scope scope, bool template_header_p)
11369 if (scope == ts_global)
11371 /* First try ordinary name lookup, ignoring hidden class name
11372 injected via friend declaration. */
11373 decl = lookup_name_prefer_type (name, 2);
11374 /* If that fails, the name will be placed in the smallest
11375 non-class, non-function-prototype scope according to 3.3.1/5.
11376 We may already have a hidden name declared as friend in this
11377 scope. So lookup again but not ignoring hidden names.
11378 If we find one, that name will be made visible rather than
11379 creating a new tag. */
11381 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11384 decl = lookup_type_scope (name, scope);
11386 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11387 decl = DECL_TEMPLATE_RESULT (decl);
11389 if (decl && TREE_CODE (decl) == TYPE_DECL)
11391 /* Look for invalid nested type:
11395 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11397 error ("%qD has the same name as the class in which it is "
11400 return error_mark_node;
11403 /* Two cases we need to consider when deciding if a class
11404 template is allowed as an elaborated type specifier:
11405 1. It is a self reference to its own class.
11406 2. It comes with a template header.
11410 template <class T> class C {
11411 class C *c1; // DECL_SELF_REFERENCE_P is true
11414 template <class U> class C; // template_header_p is true
11415 template <class T> class C<T>::D {
11416 class C *c2; // DECL_SELF_REFERENCE_P is true
11419 t = check_elaborated_type_specifier (tag_code,
11422 | DECL_SELF_REFERENCE_P (decl));
11425 else if (decl && TREE_CODE (decl) == TREE_LIST)
11427 error ("reference to %qD is ambiguous", name);
11428 print_candidates (decl);
11429 return error_mark_node;
11435 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11436 Define the tag as a forward-reference if it is not defined.
11438 If a declaration is given, process it here, and report an error if
11439 multiple declarations are not identical.
11441 SCOPE is TS_CURRENT when this is also a definition. Only look in
11442 the current frame for the name (since C++ allows new names in any
11443 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11444 declaration. Only look beginning from the current scope outward up
11445 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11447 TEMPLATE_HEADER_P is true when this declaration is preceded by
11448 a set of template parameters. */
11451 xref_tag_1 (enum tag_types tag_code, tree name,
11452 tag_scope scope, bool template_header_p)
11454 enum tree_code code;
11456 tree context = NULL_TREE;
11458 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11464 code = RECORD_TYPE;
11470 code = ENUMERAL_TYPE;
11473 gcc_unreachable ();
11476 /* In case of anonymous name, xref_tag is only called to
11477 make type node and push name. Name lookup is not required. */
11478 if (ANON_AGGRNAME_P (name))
11481 t = lookup_and_check_tag (tag_code, name,
11482 scope, template_header_p);
11484 if (t == error_mark_node)
11485 return error_mark_node;
11487 if (scope != ts_current && t && current_class_type
11488 && template_class_depth (current_class_type)
11489 && template_header_p)
11491 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11492 definition of this tag. Since, in addition, we are currently
11493 processing a (member) template declaration of a template
11494 class, we must be very careful; consider:
11501 { template <class V>
11502 friend struct S1; };
11504 Here, the S2::S1 declaration should not be confused with the
11505 outer declaration. In particular, the inner version should
11506 have a template parameter of level 2, not level 1. This
11507 would be particularly important if the member declaration
11510 template <class V = U> friend struct S1;
11512 say, when we should tsubst into `U' when instantiating
11513 S2. On the other hand, when presented with:
11523 we must find the inner binding eventually. We
11524 accomplish this by making sure that the new type we
11525 create to represent this declaration has the right
11527 context = TYPE_CONTEXT (t);
11533 /* If no such tag is yet defined, create a forward-reference node
11534 and record it as the "definition".
11535 When a real declaration of this type is found,
11536 the forward-reference will be altered into a real type. */
11537 if (code == ENUMERAL_TYPE)
11539 error ("use of enum %q#D without previous declaration", name);
11540 return error_mark_node;
11544 t = make_class_type (code);
11545 TYPE_CONTEXT (t) = context;
11546 t = pushtag (name, t, scope);
11551 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11553 if (!redeclare_class_template (t, current_template_parms))
11554 return error_mark_node;
11556 else if (!processing_template_decl
11557 && CLASS_TYPE_P (t)
11558 && CLASSTYPE_IS_TEMPLATE (t))
11560 error ("redeclaration of %qT as a non-template", t);
11561 error ("previous declaration %q+D", t);
11562 return error_mark_node;
11565 /* Make injected friend class visible. */
11566 if (scope != ts_within_enclosing_non_class
11567 && hidden_name_p (TYPE_NAME (t)))
11569 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11570 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11572 if (TYPE_TEMPLATE_INFO (t))
11574 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11575 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11583 /* Wrapper for xref_tag_1. */
11586 xref_tag (enum tag_types tag_code, tree name,
11587 tag_scope scope, bool template_header_p)
11591 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11592 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11593 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11599 xref_tag_from_type (tree old, tree id, tag_scope scope)
11601 enum tag_types tag_kind;
11603 if (TREE_CODE (old) == RECORD_TYPE)
11604 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11606 tag_kind = union_type;
11608 if (id == NULL_TREE)
11609 id = TYPE_IDENTIFIER (old);
11611 return xref_tag (tag_kind, id, scope, false);
11614 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11615 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11616 access_* node, and the TREE_VALUE is the type of the base-class.
11617 Non-NULL TREE_TYPE indicates virtual inheritance.
11619 Returns true if the binfo hierarchy was successfully created,
11620 false if an error was detected. */
11623 xref_basetypes (tree ref, tree base_list)
11626 tree binfo, base_binfo;
11627 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11628 unsigned max_bases = 0; /* Maximum direct bases. */
11630 tree default_access;
11631 tree igo_prev; /* Track Inheritance Graph Order. */
11633 if (ref == error_mark_node)
11636 /* The base of a derived class is private by default, all others are
11638 default_access = (TREE_CODE (ref) == RECORD_TYPE
11639 && CLASSTYPE_DECLARED_CLASS (ref)
11640 ? access_private_node : access_public_node);
11642 /* First, make sure that any templates in base-classes are
11643 instantiated. This ensures that if we call ourselves recursively
11644 we do not get confused about which classes are marked and which
11646 basep = &base_list;
11649 tree basetype = TREE_VALUE (*basep);
11651 if (!(processing_template_decl && uses_template_parms (basetype))
11652 && !complete_type_or_else (basetype, NULL))
11653 /* An incomplete type. Remove it from the list. */
11654 *basep = TREE_CHAIN (*basep);
11658 if (TREE_TYPE (*basep))
11660 if (CLASS_TYPE_P (basetype))
11661 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11662 basep = &TREE_CHAIN (*basep);
11666 TYPE_MARKED_P (ref) = 1;
11668 /* The binfo slot should be empty, unless this is an (ill-formed)
11670 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11672 error ("redefinition of %q#T", ref);
11676 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11678 binfo = make_tree_binfo (max_bases);
11680 TYPE_BINFO (ref) = binfo;
11681 BINFO_OFFSET (binfo) = size_zero_node;
11682 BINFO_TYPE (binfo) = ref;
11684 /* Apply base-class info set up to the variants of this type. */
11685 fixup_type_variants (ref);
11689 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11690 /* An aggregate cannot have baseclasses. */
11691 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11693 if (TREE_CODE (ref) == UNION_TYPE)
11695 error ("derived union %qT invalid", ref);
11702 if (TYPE_FOR_JAVA (ref))
11704 error ("Java class %qT cannot have multiple bases", ref);
11711 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11713 if (TYPE_FOR_JAVA (ref))
11715 error ("Java class %qT cannot have virtual bases", ref);
11720 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11722 tree access = TREE_PURPOSE (base_list);
11723 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11724 tree basetype = TREE_VALUE (base_list);
11726 if (access == access_default_node)
11727 access = default_access;
11729 if (PACK_EXPANSION_P (basetype))
11730 basetype = PACK_EXPANSION_PATTERN (basetype);
11731 if (TREE_CODE (basetype) == TYPE_DECL)
11732 basetype = TREE_TYPE (basetype);
11733 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11735 error ("base type %qT fails to be a struct or class type",
11740 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11741 TYPE_FOR_JAVA (ref) = 1;
11743 base_binfo = NULL_TREE;
11744 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11746 base_binfo = TYPE_BINFO (basetype);
11747 /* The original basetype could have been a typedef'd type. */
11748 basetype = BINFO_TYPE (base_binfo);
11750 /* Inherit flags from the base. */
11751 TYPE_HAS_NEW_OPERATOR (ref)
11752 |= TYPE_HAS_NEW_OPERATOR (basetype);
11753 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11754 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11755 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11756 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11757 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11758 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11759 CLASSTYPE_REPEATED_BASE_P (ref)
11760 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11763 /* We must do this test after we've seen through a typedef
11765 if (TYPE_MARKED_P (basetype))
11767 if (basetype == ref)
11768 error ("recursive type %qT undefined", basetype);
11770 error ("duplicate base type %qT invalid", basetype);
11774 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11775 /* Regenerate the pack expansion for the bases. */
11776 basetype = make_pack_expansion (basetype);
11778 TYPE_MARKED_P (basetype) = 1;
11780 base_binfo = copy_binfo (base_binfo, basetype, ref,
11781 &igo_prev, via_virtual);
11782 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11783 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11785 BINFO_BASE_APPEND (binfo, base_binfo);
11786 BINFO_BASE_ACCESS_APPEND (binfo, access);
11789 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11790 /* If we have space in the vbase vector, we must have shared at
11791 least one of them, and are therefore diamond shaped. */
11792 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11794 /* Unmark all the types. */
11795 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11796 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11797 TYPE_MARKED_P (ref) = 0;
11799 /* Now see if we have a repeated base type. */
11800 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11802 for (base_binfo = binfo; base_binfo;
11803 base_binfo = TREE_CHAIN (base_binfo))
11805 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11807 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11810 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11812 for (base_binfo = binfo; base_binfo;
11813 base_binfo = TREE_CHAIN (base_binfo))
11814 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11815 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11824 /* Copies the enum-related properties from type SRC to type DST.
11825 Used with the underlying type of an enum and the enum itself. */
11827 copy_type_enum (tree dst, tree src)
11829 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11830 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11831 TYPE_SIZE (dst) = TYPE_SIZE (src);
11832 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11833 SET_TYPE_MODE (dst, TYPE_MODE (src));
11834 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11835 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11836 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11837 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11840 /* Begin compiling the definition of an enumeration type.
11843 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11845 UNDERLYING_TYPE is the type that will be used as the storage for
11846 the enumeration type. This should be NULL_TREE if no storage type
11849 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11851 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11853 Returns the type object, as yet incomplete.
11854 Also records info about it so that build_enumerator
11855 may be used to declare the individual values as they are read. */
11858 start_enum (tree name, tree enumtype, tree underlying_type,
11859 bool scoped_enum_p, bool *is_new)
11861 tree prevtype = NULL_TREE;
11862 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11866 /* [C++0x dcl.enum]p5:
11868 If not explicitly specified, the underlying type of a scoped
11869 enumeration type is int. */
11870 if (!underlying_type && scoped_enum_p)
11871 underlying_type = integer_type_node;
11873 if (underlying_type)
11874 underlying_type = cv_unqualified (underlying_type);
11876 /* If this is the real definition for a previous forward reference,
11877 fill in the contents in the same object that used to be the
11878 forward reference. */
11880 enumtype = lookup_and_check_tag (enum_type, name,
11881 /*tag_scope=*/ts_current,
11882 /*template_header_p=*/false);
11884 /* In case of a template_decl, the only check that should be deferred
11885 to instantiation time is the comparison of underlying types. */
11886 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11888 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11890 error_at (input_location, "scoped/unscoped mismatch "
11891 "in enum %q#T", enumtype);
11892 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11893 "previous definition here");
11894 enumtype = error_mark_node;
11896 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11898 error_at (input_location, "underlying type mismatch "
11899 "in enum %q#T", enumtype);
11900 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11901 "previous definition here");
11902 enumtype = error_mark_node;
11904 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11905 && !dependent_type_p (underlying_type)
11906 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11907 && !same_type_p (underlying_type,
11908 ENUM_UNDERLYING_TYPE (enumtype)))
11910 error_at (input_location, "different underlying type "
11911 "in enum %q#T", enumtype);
11912 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11913 "previous definition here");
11914 underlying_type = NULL_TREE;
11918 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11919 || processing_template_decl)
11921 /* In case of error, make a dummy enum to allow parsing to
11923 if (enumtype == error_mark_node)
11925 name = make_anon_name ();
11926 enumtype = NULL_TREE;
11929 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11930 of an opaque enum, or an opaque enum of an already defined
11931 enumeration (C++0x only).
11932 In any other case, it'll be NULL_TREE. */
11938 prevtype = enumtype;
11939 enumtype = cxx_make_type (ENUMERAL_TYPE);
11940 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11941 if (enumtype == error_mark_node)
11942 return error_mark_node;
11944 /* The enum is considered opaque until the opening '{' of the
11945 enumerator list. */
11946 SET_OPAQUE_ENUM_P (enumtype, true);
11947 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11950 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11952 if (underlying_type)
11954 if (CP_INTEGRAL_TYPE_P (underlying_type))
11956 copy_type_enum (enumtype, underlying_type);
11957 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11959 else if (dependent_type_p (underlying_type))
11960 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11962 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11963 underlying_type, enumtype);
11966 /* If into a template class, the returned enum is always the first
11967 declaration (opaque or not) seen. This way all the references to
11968 this type will be to the same declaration. The following ones are used
11969 only to check for definition errors. */
11970 if (prevtype && processing_template_decl)
11976 /* After processing and defining all the values of an enumeration type,
11977 install their decls in the enumeration type.
11978 ENUMTYPE is the type object. */
11981 finish_enum_value_list (tree enumtype)
11984 tree underlying_type;
11987 tree minnode, maxnode;
11990 bool fixed_underlying_type_p
11991 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11993 /* We built up the VALUES in reverse order. */
11994 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11996 /* For an enum defined in a template, just set the type of the values;
11997 all further processing is postponed until the template is
11998 instantiated. We need to set the type so that tsubst of a CONST_DECL
12000 if (processing_template_decl)
12002 for (values = TYPE_VALUES (enumtype);
12004 values = TREE_CHAIN (values))
12005 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12009 /* Determine the minimum and maximum values of the enumerators. */
12010 if (TYPE_VALUES (enumtype))
12012 minnode = maxnode = NULL_TREE;
12014 for (values = TYPE_VALUES (enumtype);
12016 values = TREE_CHAIN (values))
12018 decl = TREE_VALUE (values);
12020 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12021 each enumerator has the type of its enumeration. Prior to the
12022 closing brace, the type of each enumerator is the type of its
12023 initializing value. */
12024 TREE_TYPE (decl) = enumtype;
12026 /* Update the minimum and maximum values, if appropriate. */
12027 value = DECL_INITIAL (decl);
12028 if (value == error_mark_node)
12029 value = integer_zero_node;
12030 /* Figure out what the minimum and maximum values of the
12031 enumerators are. */
12033 minnode = maxnode = value;
12034 else if (tree_int_cst_lt (maxnode, value))
12036 else if (tree_int_cst_lt (value, minnode))
12043 If the enumerator-list is empty, the underlying type is as if
12044 the enumeration had a single enumerator with value 0. */
12045 minnode = maxnode = integer_zero_node;
12047 if (!fixed_underlying_type_p)
12049 /* Compute the number of bits require to represent all values of the
12050 enumeration. We must do this before the type of MINNODE and
12051 MAXNODE are transformed, since tree_int_cst_min_precision relies
12052 on the TREE_TYPE of the value it is passed. */
12053 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12054 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12055 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12056 int precision = MAX (lowprec, highprec);
12058 bool use_short_enum;
12060 /* Determine the underlying type of the enumeration.
12064 The underlying type of an enumeration is an integral type that
12065 can represent all the enumerator values defined in the
12066 enumeration. It is implementation-defined which integral type is
12067 used as the underlying type for an enumeration except that the
12068 underlying type shall not be larger than int unless the value of
12069 an enumerator cannot fit in an int or unsigned int.
12071 We use "int" or an "unsigned int" as the underlying type, even if
12072 a smaller integral type would work, unless the user has
12073 explicitly requested that we use the smallest possible type. The
12074 user can request that for all enumerations with a command line
12075 flag, or for just one enumeration with an attribute. */
12077 use_short_enum = flag_short_enums
12078 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12080 for (itk = (use_short_enum ? itk_char : itk_int);
12084 underlying_type = integer_types[itk];
12085 if (underlying_type != NULL_TREE
12086 && TYPE_PRECISION (underlying_type) >= precision
12087 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12090 if (itk == itk_none)
12094 IF no integral type can represent all the enumerator values, the
12095 enumeration is ill-formed. */
12096 error ("no integral type can represent all of the enumerator values "
12097 "for %qT", enumtype);
12098 precision = TYPE_PRECISION (long_long_integer_type_node);
12099 underlying_type = integer_types[itk_unsigned_long_long];
12104 The value of sizeof() applied to an enumeration type, an object
12105 of an enumeration type, or an enumerator, is the value of sizeof()
12106 applied to the underlying type. */
12107 copy_type_enum (enumtype, underlying_type);
12109 /* Compute the minimum and maximum values for the type.
12113 For an enumeration where emin is the smallest enumerator and emax
12114 is the largest, the values of the enumeration are the values of the
12115 underlying type in the range bmin to bmax, where bmin and bmax are,
12116 respectively, the smallest and largest values of the smallest bit-
12117 field that can store emin and emax. */
12119 /* The middle-end currently assumes that types with TYPE_PRECISION
12120 narrower than their underlying type are suitably zero or sign
12121 extended to fill their mode. Similarly, it assumes that the front
12122 end assures that a value of a particular type must be within
12123 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12125 We used to set these fields based on bmin and bmax, but that led
12126 to invalid assumptions like optimizing away bounds checking. So
12127 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12128 TYPE_MAX_VALUE to the values for the mode above and only restrict
12129 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12130 ENUM_UNDERLYING_TYPE (enumtype)
12131 = build_distinct_type_copy (underlying_type);
12132 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12133 set_min_and_max_values_for_integral_type
12134 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12136 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12137 if (flag_strict_enums)
12138 set_min_and_max_values_for_integral_type (enumtype, precision,
12142 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12144 /* Convert each of the enumerators to the type of the underlying
12145 type of the enumeration. */
12146 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12148 location_t saved_location;
12150 decl = TREE_VALUE (values);
12151 saved_location = input_location;
12152 input_location = DECL_SOURCE_LOCATION (decl);
12153 if (fixed_underlying_type_p)
12154 /* If the enumeration type has a fixed underlying type, we
12155 already checked all of the enumerator values. */
12156 value = DECL_INITIAL (decl);
12158 value = perform_implicit_conversion (underlying_type,
12159 DECL_INITIAL (decl),
12160 tf_warning_or_error);
12161 input_location = saved_location;
12163 /* Do not clobber shared ints. */
12164 value = copy_node (value);
12166 TREE_TYPE (value) = enumtype;
12167 DECL_INITIAL (decl) = value;
12170 /* Fix up all variant types of this enum type. */
12171 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12172 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12174 /* Finish debugging output for this type. */
12175 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12178 /* Finishes the enum type. This is called only the first time an
12179 enumeration is seen, be it opaque or odinary.
12180 ENUMTYPE is the type object. */
12183 finish_enum (tree enumtype)
12185 if (processing_template_decl)
12187 if (at_function_scope_p ())
12188 add_stmt (build_min (TAG_DEFN, enumtype));
12192 /* Here there should not be any variants of this type. */
12193 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12194 && !TYPE_NEXT_VARIANT (enumtype));
12197 /* Build and install a CONST_DECL for an enumeration constant of the
12198 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12199 LOC is the location of NAME.
12200 Assignment of sequential values by default is handled here. */
12203 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12209 /* If the VALUE was erroneous, pretend it wasn't there; that will
12210 result in the enum being assigned the next value in sequence. */
12211 if (value == error_mark_node)
12214 /* Remove no-op casts from the value. */
12216 STRIP_TYPE_NOPS (value);
12218 if (! processing_template_decl)
12220 /* Validate and default VALUE. */
12221 if (value != NULL_TREE)
12223 value = cxx_constant_value (value);
12225 if (TREE_CODE (value) == INTEGER_CST
12226 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12228 value = perform_integral_promotions (value);
12232 error ("enumerator value for %qD is not an integer constant", name);
12237 /* Default based on previous value. */
12238 if (value == NULL_TREE)
12240 if (TYPE_VALUES (enumtype))
12243 unsigned HOST_WIDE_INT lo;
12247 /* C++03 7.2/4: If no initializer is specified for the first
12248 enumerator, the type is an unspecified integral
12249 type. Otherwise the type is the same as the type of the
12250 initializing value of the preceding enumerator unless the
12251 incremented value is not representable in that type, in
12252 which case the type is an unspecified integral type
12253 sufficient to contain the incremented value. */
12254 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12255 if (error_operand_p (prev_value))
12256 value = error_mark_node;
12259 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12260 TREE_INT_CST_HIGH (prev_value),
12265 tree type = TREE_TYPE (prev_value);
12266 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12267 di.low = lo; di.high = hi;
12268 if (!double_int_fits_to_tree_p (type, di))
12271 for (itk = itk_int; itk != itk_none; itk++)
12273 type = integer_types[itk];
12274 if (type != NULL_TREE
12275 && (pos || !TYPE_UNSIGNED (type))
12276 && double_int_fits_to_tree_p (type, di))
12279 if (type && cxx_dialect < cxx0x
12280 && itk > itk_unsigned_long)
12281 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12282 incremented enumerator value is too large for %<unsigned long%>" : "\
12283 incremented enumerator value is too large for %<long%>");
12285 if (type == NULL_TREE)
12288 value = double_int_to_tree (type, di);
12293 error ("overflow in enumeration values at %qD", name);
12294 value = error_mark_node;
12299 value = integer_zero_node;
12302 /* Remove no-op casts from the value. */
12303 STRIP_TYPE_NOPS (value);
12305 /* If the underlying type of the enum is fixed, check whether
12306 the enumerator values fits in the underlying type. If it
12307 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12308 if (ENUM_UNDERLYING_TYPE (enumtype)
12310 && TREE_CODE (value) == INTEGER_CST
12311 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12313 error ("enumerator value %E is too large for underlying type %<%T%>",
12314 value, ENUM_UNDERLYING_TYPE (enumtype));
12316 /* Silently convert the value so that we can continue. */
12317 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12322 /* C++ associates enums with global, function, or class declarations. */
12323 context = current_scope ();
12325 /* Build the actual enumeration constant. Note that the enumeration
12326 constants have the underlying type of the enum (if it is fixed)
12327 or the type of their initializer (if the underlying type of the
12328 enum is not fixed):
12332 If the underlying type is fixed, the type of each enumerator
12333 prior to the closing brace is the underlying type; if the
12334 initializing value of an enumerator cannot be represented by
12335 the underlying type, the program is ill-formed. If the
12336 underlying type is not fixed, the type of each enumerator is
12337 the type of its initializing value.
12339 If the underlying type is not fixed, it will be computed by
12340 finish_enum and we will reset the type of this enumerator. Of
12341 course, if we're processing a template, there may be no value. */
12342 type = value ? TREE_TYPE (value) : NULL_TREE;
12344 if (context && context == current_class_type)
12345 /* This enum declaration is local to the class. We need the full
12346 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12347 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12349 /* It's a global enum, or it's local to a function. (Note local to
12350 a function could mean local to a class method. */
12351 decl = build_decl (loc, CONST_DECL, name, type);
12353 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12354 TREE_CONSTANT (decl) = 1;
12355 TREE_READONLY (decl) = 1;
12356 DECL_INITIAL (decl) = value;
12358 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12359 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12360 on the TYPE_FIELDS list for `S'. (That's so that you can say
12361 things like `S::i' later.) */
12362 finish_member_declaration (decl);
12366 /* Add this enumeration constant to the list for this type. */
12367 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12370 /* Look for an enumerator with the given NAME within the enumeration
12371 type ENUMTYPE. This routine is used primarily for qualified name
12372 lookup into an enumerator in C++0x, e.g.,
12374 enum class Color { Red, Green, Blue };
12376 Color color = Color::Red;
12378 Returns the value corresponding to the enumerator, or
12379 NULL_TREE if no such enumerator was found. */
12381 lookup_enumerator (tree enumtype, tree name)
12384 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12386 e = purpose_member (name, TYPE_VALUES (enumtype));
12387 return e? TREE_VALUE (e) : NULL_TREE;
12391 /* We're defining DECL. Make sure that its type is OK. */
12394 check_function_type (tree decl, tree current_function_parms)
12396 tree fntype = TREE_TYPE (decl);
12397 tree return_type = complete_type (TREE_TYPE (fntype));
12399 /* In a function definition, arg types must be complete. */
12400 require_complete_types_for_parms (current_function_parms);
12402 if (dependent_type_p (return_type))
12404 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12405 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12407 tree args = TYPE_ARG_TYPES (fntype);
12409 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12410 error ("return type %q#T is incomplete", return_type);
12412 error ("return type has Java class type %q#T", return_type);
12414 /* Make it return void instead. */
12415 if (TREE_CODE (fntype) == METHOD_TYPE)
12416 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12418 TREE_CHAIN (args));
12420 fntype = build_function_type (void_type_node, args);
12422 = build_exception_variant (fntype,
12423 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12424 fntype = (cp_build_type_attribute_variant
12425 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12426 TREE_TYPE (decl) = fntype;
12429 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12432 /* Create the FUNCTION_DECL for a function definition.
12433 DECLSPECS and DECLARATOR are the parts of the declaration;
12434 they describe the function's name and the type it returns,
12435 but twisted together in a fashion that parallels the syntax of C.
12437 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12438 DECLARATOR is really the DECL for the function we are about to
12439 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12440 indicating that the function is an inline defined in-class.
12442 This function creates a binding context for the function body
12443 as well as setting up the FUNCTION_DECL in current_function_decl.
12445 For C++, we must first check whether that datum makes any sense.
12446 For example, "class A local_a(1,2);" means that variable local_a
12447 is an aggregate of type A, which should have a constructor
12448 applied to it with the argument list [1, 2].
12450 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12451 or may be a BLOCK if the function has been defined previously
12452 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12453 error_mark_node if the function has never been defined, or
12454 a BLOCK if the function has been defined somewhere. */
12457 start_preparsed_function (tree decl1, tree attrs, int flags)
12459 tree ctype = NULL_TREE;
12462 int doing_friend = 0;
12463 cp_binding_level *bl;
12464 tree current_function_parms;
12465 struct c_fileinfo *finfo
12466 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12467 bool honor_interface;
12469 /* Sanity check. */
12470 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12471 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12473 fntype = TREE_TYPE (decl1);
12474 if (TREE_CODE (fntype) == METHOD_TYPE)
12475 ctype = TYPE_METHOD_BASETYPE (fntype);
12477 /* ISO C++ 11.4/5. A friend function defined in a class is in
12478 the (lexical) scope of the class in which it is defined. */
12479 if (!ctype && DECL_FRIEND_P (decl1))
12481 ctype = DECL_FRIEND_CONTEXT (decl1);
12483 /* CTYPE could be null here if we're dealing with a template;
12484 for example, `inline friend float foo()' inside a template
12485 will have no CTYPE set. */
12486 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12492 if (DECL_DECLARED_INLINE_P (decl1)
12493 && lookup_attribute ("noinline", attrs))
12494 warning (0, "inline function %q+D given attribute noinline", decl1);
12496 /* Handle gnu_inline attribute. */
12497 if (GNU_INLINE_P (decl1))
12499 DECL_EXTERNAL (decl1) = 1;
12500 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12501 DECL_INTERFACE_KNOWN (decl1) = 1;
12502 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12505 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12506 /* This is a constructor, we must ensure that any default args
12507 introduced by this definition are propagated to the clones
12508 now. The clones are used directly in overload resolution. */
12509 adjust_clone_args (decl1);
12511 /* Sometimes we don't notice that a function is a static member, and
12512 build a METHOD_TYPE for it. Fix that up now. */
12513 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12514 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12516 /* Set up current_class_type, and enter the scope of the class, if
12519 push_nested_class (ctype);
12520 else if (DECL_STATIC_FUNCTION_P (decl1))
12521 push_nested_class (DECL_CONTEXT (decl1));
12523 /* Now that we have entered the scope of the class, we must restore
12524 the bindings for any template parameters surrounding DECL1, if it
12525 is an inline member template. (Order is important; consider the
12526 case where a template parameter has the same name as a field of
12527 the class.) It is not until after this point that
12528 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12529 if (flags & SF_INCLASS_INLINE)
12530 maybe_begin_member_template_processing (decl1);
12532 /* Effective C++ rule 15. */
12534 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12535 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12536 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12538 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12539 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12540 if (!DECL_INITIAL (decl1))
12541 DECL_INITIAL (decl1) = error_mark_node;
12543 /* This function exists in static storage.
12544 (This does not mean `static' in the C sense!) */
12545 TREE_STATIC (decl1) = 1;
12547 /* We must call push_template_decl after current_class_type is set
12548 up. (If we are processing inline definitions after exiting a
12549 class scope, current_class_type will be NULL_TREE until set above
12550 by push_nested_class.) */
12551 if (processing_template_decl)
12553 /* FIXME: Handle error_mark_node more gracefully. */
12554 tree newdecl1 = push_template_decl (decl1);
12555 if (newdecl1 != error_mark_node)
12559 /* We are now in the scope of the function being defined. */
12560 current_function_decl = decl1;
12562 /* Save the parm names or decls from this function's declarator
12563 where store_parm_decls will find them. */
12564 current_function_parms = DECL_ARGUMENTS (decl1);
12566 /* Make sure the parameter and return types are reasonable. When
12567 you declare a function, these types can be incomplete, but they
12568 must be complete when you define the function. */
12569 check_function_type (decl1, current_function_parms);
12571 /* Build the return declaration for the function. */
12572 restype = TREE_TYPE (fntype);
12573 if (DECL_RESULT (decl1) == NULL_TREE)
12577 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12578 DECL_ARTIFICIAL (resdecl) = 1;
12579 DECL_IGNORED_P (resdecl) = 1;
12580 DECL_RESULT (decl1) = resdecl;
12582 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12585 /* Let the user know we're compiling this function. */
12586 announce_function (decl1);
12588 /* Record the decl so that the function name is defined.
12589 If we already have a decl for this name, and it is a FUNCTION_DECL,
12590 use the old decl. */
12591 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12593 /* A specialization is not used to guide overload resolution. */
12594 if (!DECL_FUNCTION_MEMBER_P (decl1)
12595 && !(DECL_USE_TEMPLATE (decl1) &&
12596 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12598 tree olddecl = pushdecl (decl1);
12600 if (olddecl == error_mark_node)
12601 /* If something went wrong when registering the declaration,
12602 use DECL1; we have to have a FUNCTION_DECL to use when
12603 parsing the body of the function. */
12607 /* Otherwise, OLDDECL is either a previous declaration
12608 of the same function or DECL1 itself. */
12610 if (warn_missing_declarations
12611 && olddecl == decl1
12612 && !DECL_MAIN_P (decl1)
12613 && TREE_PUBLIC (decl1)
12614 && !DECL_DECLARED_INLINE_P (decl1))
12618 /* Check whether DECL1 is in an anonymous
12620 for (context = DECL_CONTEXT (decl1);
12622 context = DECL_CONTEXT (context))
12624 if (TREE_CODE (context) == NAMESPACE_DECL
12625 && DECL_NAME (context) == NULL_TREE)
12629 if (context == NULL)
12630 warning (OPT_Wmissing_declarations,
12631 "no previous declaration for %q+D", decl1);
12639 /* We need to set the DECL_CONTEXT. */
12640 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12641 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12643 fntype = TREE_TYPE (decl1);
12645 /* If #pragma weak applies, mark the decl appropriately now.
12646 The pragma only applies to global functions. Because
12647 determining whether or not the #pragma applies involves
12648 computing the mangled name for the declaration, we cannot
12649 apply the pragma until after we have merged this declaration
12650 with any previous declarations; if the original declaration
12651 has a linkage specification, that specification applies to
12652 the definition as well, and may affect the mangled name. */
12653 if (DECL_FILE_SCOPE_P (decl1))
12654 maybe_apply_pragma_weak (decl1);
12657 /* Reset this in case the call to pushdecl changed it. */
12658 current_function_decl = decl1;
12660 gcc_assert (DECL_INITIAL (decl1));
12662 /* This function may already have been parsed, in which case just
12663 return; our caller will skip over the body without parsing. */
12664 if (DECL_INITIAL (decl1) != error_mark_node)
12667 /* Initialize RTL machinery. We cannot do this until
12668 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12669 even when processing a template; this is how we get
12670 CFUN set up, and our per-function variables initialized.
12671 FIXME factor out the non-RTL stuff. */
12672 bl = current_binding_level;
12673 allocate_struct_function (decl1, processing_template_decl);
12675 /* Initialize the language data structures. Whenever we start
12676 a new function, we destroy temporaries in the usual way. */
12677 cfun->language = ggc_alloc_cleared_language_function ();
12678 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12679 current_binding_level = bl;
12681 /* Start the statement-tree, start the tree now. */
12682 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12684 /* If we are (erroneously) defining a function that we have already
12685 defined before, wipe out what we knew before. */
12686 if (!DECL_PENDING_INLINE_P (decl1))
12687 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12689 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12691 /* We know that this was set up by `grokclassfn'. We do not
12692 wait until `store_parm_decls', since evil parse errors may
12693 never get us to that point. Here we keep the consistency
12694 between `current_class_type' and `current_class_ptr'. */
12695 tree t = DECL_ARGUMENTS (decl1);
12697 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12698 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12700 cp_function_chain->x_current_class_ref
12701 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12702 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12703 cp_function_chain->x_current_class_ptr = t;
12705 /* Constructors and destructors need to know whether they're "in
12706 charge" of initializing virtual base classes. */
12707 t = DECL_CHAIN (t);
12708 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12710 current_in_charge_parm = t;
12711 t = DECL_CHAIN (t);
12713 if (DECL_HAS_VTT_PARM_P (decl1))
12715 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12716 current_vtt_parm = t;
12720 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12721 /* Implicitly-defined methods (like the
12722 destructor for a class in which no destructor
12723 is explicitly declared) must not be defined
12724 until their definition is needed. So, we
12725 ignore interface specifications for
12726 compiler-generated functions. */
12727 && !DECL_ARTIFICIAL (decl1));
12729 if (processing_template_decl)
12730 /* Don't mess with interface flags. */;
12731 else if (DECL_INTERFACE_KNOWN (decl1))
12733 tree ctx = decl_function_context (decl1);
12735 if (DECL_NOT_REALLY_EXTERN (decl1))
12736 DECL_EXTERNAL (decl1) = 0;
12738 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12739 && TREE_PUBLIC (ctx))
12740 /* This is a function in a local class in an extern inline
12742 comdat_linkage (decl1);
12744 /* If this function belongs to an interface, it is public.
12745 If it belongs to someone else's interface, it is also external.
12746 This only affects inlines and template instantiations. */
12747 else if (!finfo->interface_unknown && honor_interface)
12749 if (DECL_DECLARED_INLINE_P (decl1)
12750 || DECL_TEMPLATE_INSTANTIATION (decl1))
12752 DECL_EXTERNAL (decl1)
12753 = (finfo->interface_only
12754 || (DECL_DECLARED_INLINE_P (decl1)
12755 && ! flag_implement_inlines
12756 && !DECL_VINDEX (decl1)));
12758 /* For WIN32 we also want to put these in linkonce sections. */
12759 maybe_make_one_only (decl1);
12762 DECL_EXTERNAL (decl1) = 0;
12763 DECL_INTERFACE_KNOWN (decl1) = 1;
12764 /* If this function is in an interface implemented in this file,
12765 make sure that the back end knows to emit this function
12767 if (!DECL_EXTERNAL (decl1))
12768 mark_needed (decl1);
12770 else if (finfo->interface_unknown && finfo->interface_only
12771 && honor_interface)
12773 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12774 interface, we will have both finfo->interface_unknown and
12775 finfo->interface_only set. In that case, we don't want to
12776 use the normal heuristics because someone will supply a
12777 #pragma implementation elsewhere, and deducing it here would
12778 produce a conflict. */
12779 comdat_linkage (decl1);
12780 DECL_EXTERNAL (decl1) = 0;
12781 DECL_INTERFACE_KNOWN (decl1) = 1;
12782 DECL_DEFER_OUTPUT (decl1) = 1;
12786 /* This is a definition, not a reference.
12787 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12788 if (!GNU_INLINE_P (decl1))
12789 DECL_EXTERNAL (decl1) = 0;
12791 if ((DECL_DECLARED_INLINE_P (decl1)
12792 || DECL_TEMPLATE_INSTANTIATION (decl1))
12793 && ! DECL_INTERFACE_KNOWN (decl1))
12794 DECL_DEFER_OUTPUT (decl1) = 1;
12796 DECL_INTERFACE_KNOWN (decl1) = 1;
12799 /* Determine the ELF visibility attribute for the function. We must not
12800 do this before calling "pushdecl", as we must allow "duplicate_decls"
12801 to merge any attributes appropriately. We also need to wait until
12803 if (!DECL_CLONED_FUNCTION_P (decl1))
12804 determine_visibility (decl1);
12806 begin_scope (sk_function_parms, decl1);
12810 if (DECL_DESTRUCTOR_P (decl1)
12811 || (DECL_CONSTRUCTOR_P (decl1)
12812 && targetm.cxx.cdtor_returns_this ()))
12814 cdtor_label = build_decl (input_location,
12815 LABEL_DECL, NULL_TREE, NULL_TREE);
12816 DECL_CONTEXT (cdtor_label) = current_function_decl;
12819 start_fname_decls ();
12821 store_parm_decls (current_function_parms);
12825 /* Like start_preparsed_function, except that instead of a
12826 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12828 Returns 1 on success. If the DECLARATOR is not suitable for a function
12829 (it defines a datum instead), we return 0, which tells
12830 yyparse to report a parse error. */
12833 start_function (cp_decl_specifier_seq *declspecs,
12834 const cp_declarator *declarator,
12839 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12840 if (decl1 == error_mark_node)
12842 /* If the declarator is not suitable for a function definition,
12843 cause a syntax error. */
12844 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12846 error ("invalid function declaration");
12850 if (DECL_MAIN_P (decl1))
12851 /* main must return int. grokfndecl should have corrected it
12852 (and issued a diagnostic) if the user got it wrong. */
12853 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12854 integer_type_node));
12856 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12861 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12865 use_eh_spec_block (tree fn)
12867 return (flag_exceptions && flag_enforce_eh_specs
12868 && !processing_template_decl
12869 && !type_throw_all_p (TREE_TYPE (fn))
12870 /* We insert the EH_SPEC_BLOCK only in the original
12871 function; then, it is copied automatically to the
12873 && !DECL_CLONED_FUNCTION_P (fn)
12874 /* Implicitly-generated constructors and destructors have
12875 exception specifications. However, those specifications
12876 are the union of the possible exceptions specified by the
12877 constructors/destructors for bases and members, so no
12878 unallowed exception will ever reach this function. By
12879 not creating the EH_SPEC_BLOCK we save a little memory,
12880 and we avoid spurious warnings about unreachable
12882 && !DECL_DEFAULTED_FN (fn));
12885 /* Store the parameter declarations into the current function declaration.
12886 This is called after parsing the parameter declarations, before
12887 digesting the body of the function.
12889 Also install to binding contour return value identifier, if any. */
12892 store_parm_decls (tree current_function_parms)
12894 tree fndecl = current_function_decl;
12897 /* This is a chain of any other decls that came in among the parm
12898 declarations. If a parm is declared with enum {foo, bar} x;
12899 then CONST_DECLs for foo and bar are put here. */
12900 tree nonparms = NULL_TREE;
12902 if (current_function_parms)
12904 /* This case is when the function was defined with an ANSI prototype.
12905 The parms already have decls, so we need not do anything here
12906 except record them as in effect
12907 and complain if any redundant old-style parm decls were written. */
12909 tree specparms = current_function_parms;
12912 /* Must clear this because it might contain TYPE_DECLs declared
12914 current_binding_level->names = NULL;
12916 /* If we're doing semantic analysis, then we'll call pushdecl
12917 for each of these. We must do them in reverse order so that
12918 they end in the correct forward order. */
12919 specparms = nreverse (specparms);
12921 for (parm = specparms; parm; parm = next)
12923 next = DECL_CHAIN (parm);
12924 if (TREE_CODE (parm) == PARM_DECL)
12926 if (DECL_NAME (parm) == NULL_TREE
12927 || TREE_CODE (parm) != VOID_TYPE)
12930 error ("parameter %qD declared void", parm);
12934 /* If we find an enum constant or a type tag,
12935 put it aside for the moment. */
12936 TREE_CHAIN (parm) = NULL_TREE;
12937 nonparms = chainon (nonparms, parm);
12941 /* Get the decls in their original chain order and record in the
12942 function. This is all and only the PARM_DECLs that were
12943 pushed into scope by the loop above. */
12944 DECL_ARGUMENTS (fndecl) = getdecls ();
12947 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12949 /* Now store the final chain of decls for the arguments
12950 as the decl-chain of the current lexical scope.
12951 Put the enumerators in as well, at the front so that
12952 DECL_ARGUMENTS is not modified. */
12953 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12955 if (use_eh_spec_block (current_function_decl))
12956 current_eh_spec_block = begin_eh_spec_block ();
12960 /* We have finished doing semantic analysis on DECL, but have not yet
12961 generated RTL for its body. Save away our current state, so that
12962 when we want to generate RTL later we know what to do. */
12965 save_function_data (tree decl)
12967 struct language_function *f;
12969 /* Save the language-specific per-function data so that we can
12970 get it back when we really expand this function. */
12971 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12974 f = ggc_alloc_language_function ();
12975 memcpy (f, cp_function_chain, sizeof (struct language_function));
12976 DECL_SAVED_FUNCTION_DATA (decl) = f;
12978 /* Clear out the bits we don't need. */
12979 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
12980 f->bindings = NULL;
12981 f->x_local_names = NULL;
12985 /* Set the return value of the constructor (if present). */
12988 finish_constructor_body (void)
12993 if (targetm.cxx.cdtor_returns_this ()
12994 && (! TYPE_FOR_JAVA (current_class_type)))
12996 /* Any return from a constructor will end up here. */
12997 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12999 val = DECL_ARGUMENTS (current_function_decl);
13000 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13001 DECL_RESULT (current_function_decl), val);
13002 /* Return the address of the object. */
13003 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13004 add_stmt (exprstmt);
13008 /* Do all the processing for the beginning of a destructor; set up the
13009 vtable pointers and cleanups for bases and members. */
13012 begin_destructor_body (void)
13014 tree compound_stmt;
13016 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13017 issued an error message. We still want to try to process the
13018 body of the function, but initialize_vtbl_ptrs will crash if
13019 TYPE_BINFO is NULL. */
13020 if (COMPLETE_TYPE_P (current_class_type))
13022 compound_stmt = begin_compound_stmt (0);
13023 /* Make all virtual function table pointers in non-virtual base
13024 classes point to CURRENT_CLASS_TYPE's virtual function
13026 initialize_vtbl_ptrs (current_class_ptr);
13027 finish_compound_stmt (compound_stmt);
13029 /* And insert cleanups for our bases and members so that they
13030 will be properly destroyed if we throw. */
13031 push_base_cleanups ();
13035 /* At the end of every destructor we generate code to delete the object if
13036 necessary. Do that now. */
13039 finish_destructor_body (void)
13043 /* Any return from a destructor will end up here; that way all base
13044 and member cleanups will be run when the function returns. */
13045 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13047 /* In a virtual destructor, we must call delete. */
13048 if (DECL_VIRTUAL_P (current_function_decl))
13051 tree virtual_size = cxx_sizeof (current_class_type);
13055 At the point of definition of a virtual destructor (including
13056 an implicit definition), non-placement operator delete shall
13057 be looked up in the scope of the destructor's class and if
13058 found shall be accessible and unambiguous. */
13059 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13061 /*global_p=*/false,
13062 /*placement=*/NULL_TREE,
13063 /*alloc_fn=*/NULL_TREE);
13065 if_stmt = begin_if_stmt ();
13066 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13067 current_in_charge_parm,
13070 finish_expr_stmt (exprstmt);
13071 finish_then_clause (if_stmt);
13072 finish_if_stmt (if_stmt);
13075 if (targetm.cxx.cdtor_returns_this ())
13079 val = DECL_ARGUMENTS (current_function_decl);
13080 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13081 DECL_RESULT (current_function_decl), val);
13082 /* Return the address of the object. */
13083 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13084 add_stmt (exprstmt);
13088 /* Do the necessary processing for the beginning of a function body, which
13089 in this case includes member-initializers, but not the catch clauses of
13090 a function-try-block. Currently, this means opening a binding level
13091 for the member-initializers (in a ctor), member cleanups (in a dtor),
13092 and capture proxies (in a lambda operator()). */
13095 begin_function_body (void)
13099 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13102 if (processing_template_decl)
13103 /* Do nothing now. */;
13105 /* Always keep the BLOCK node associated with the outermost pair of
13106 curly braces of a function. These are needed for correct
13107 operation of dwarfout.c. */
13108 keep_next_level (true);
13110 stmt = begin_compound_stmt (BCS_FN_BODY);
13112 if (processing_template_decl)
13113 /* Do nothing now. */;
13114 else if (DECL_DESTRUCTOR_P (current_function_decl))
13115 begin_destructor_body ();
13120 /* Do the processing for the end of a function body. Currently, this means
13121 closing out the cleanups for fully-constructed bases and members, and in
13122 the case of the destructor, deleting the object if desired. Again, this
13123 is only meaningful for [cd]tors, since they are the only functions where
13124 there is a significant distinction between the main body and any
13125 function catch clauses. Handling, say, main() return semantics here
13126 would be wrong, as flowing off the end of a function catch clause for
13127 main() would also need to return 0. */
13130 finish_function_body (tree compstmt)
13132 if (compstmt == NULL_TREE)
13135 /* Close the block. */
13136 finish_compound_stmt (compstmt);
13138 if (processing_template_decl)
13139 /* Do nothing now. */;
13140 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13141 finish_constructor_body ();
13142 else if (DECL_DESTRUCTOR_P (current_function_decl))
13143 finish_destructor_body ();
13146 /* Given a function, returns the BLOCK corresponding to the outermost level
13147 of curly braces, skipping the artificial block created for constructor
13151 outer_curly_brace_block (tree fndecl)
13153 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13154 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13155 /* Skip the artificial function body block. */
13156 block = BLOCK_SUBBLOCKS (block);
13160 /* If FNDECL is a class's key method, add the class to the list of
13161 keyed classes that should be emitted. */
13164 record_key_method_defined (tree fndecl)
13166 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13167 && DECL_VIRTUAL_P (fndecl)
13168 && !processing_template_decl)
13170 tree fnclass = DECL_CONTEXT (fndecl);
13171 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13172 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13176 /* Subroutine of finish_function.
13177 Save the body of constexpr functions for possible
13178 future compile time evaluation. */
13181 maybe_save_function_definition (tree fun)
13183 if (!processing_template_decl
13184 && DECL_DECLARED_CONSTEXPR_P (fun)
13185 && !DECL_CLONED_FUNCTION_P (fun))
13186 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13189 /* Finish up a function declaration and compile that function
13190 all the way to assembler language output. The free the storage
13191 for the function definition.
13193 FLAGS is a bitwise or of the following values:
13195 We just finished processing the body of an in-class inline
13196 function definition. (This processing will have taken place
13197 after the class definition is complete.) */
13200 finish_function (int flags)
13202 tree fndecl = current_function_decl;
13203 tree fntype, ctype = NULL_TREE;
13204 int inclass_inline = (flags & 2) != 0;
13206 /* When we get some parse errors, we can end up without a
13207 current_function_decl, so cope. */
13208 if (fndecl == NULL_TREE)
13209 return error_mark_node;
13211 if (c_dialect_objc ())
13212 objc_finish_function ();
13214 gcc_assert (!defer_mark_used_calls);
13215 defer_mark_used_calls = true;
13217 record_key_method_defined (fndecl);
13219 fntype = TREE_TYPE (fndecl);
13221 /* TREE_READONLY (fndecl) = 1;
13222 This caused &foo to be of type ptr-to-const-function
13223 which then got a warning when stored in a ptr-to-function variable. */
13225 gcc_assert (building_stmt_list_p ());
13226 /* The current function is being defined, so its DECL_INITIAL should
13227 be set, and unless there's a multiple definition, it should be
13228 error_mark_node. */
13229 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13231 /* For a cloned function, we've already got all the code we need;
13232 there's no need to add any extra bits. */
13233 if (!DECL_CLONED_FUNCTION_P (fndecl))
13235 if (DECL_MAIN_P (current_function_decl))
13237 /* Make it so that `main' always returns 0 by default (or
13240 finish_return_stmt (integer_one_node);
13242 finish_return_stmt (integer_zero_node);
13246 if (use_eh_spec_block (current_function_decl))
13247 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13248 (TREE_TYPE (current_function_decl)),
13249 current_eh_spec_block);
13252 /* If we're saving up tree structure, tie off the function now. */
13253 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13255 finish_fname_decls ();
13257 /* If this function can't throw any exceptions, remember that. */
13258 if (!processing_template_decl
13259 && !cp_function_chain->can_throw
13260 && !flag_non_call_exceptions
13261 && !decl_replaceable_p (fndecl))
13262 TREE_NOTHROW (fndecl) = 1;
13264 /* This must come after expand_function_end because cleanups might
13265 have declarations (from inline functions) that need to go into
13266 this function's blocks. */
13268 /* If the current binding level isn't the outermost binding level
13269 for this function, either there is a bug, or we have experienced
13270 syntax errors and the statement tree is malformed. */
13271 if (current_binding_level->kind != sk_function_parms)
13273 /* Make sure we have already experienced errors. */
13274 gcc_assert (errorcount);
13276 /* Throw away the broken statement tree and extra binding
13278 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13280 while (current_binding_level->kind != sk_function_parms)
13282 if (current_binding_level->kind == sk_class)
13283 pop_nested_class ();
13285 poplevel (0, 0, 0);
13288 poplevel (1, 0, 1);
13290 /* Statements should always be full-expressions at the outermost set
13291 of curly braces for a function. */
13292 gcc_assert (stmts_are_full_exprs_p ());
13294 /* Save constexpr function body before it gets munged by
13295 the NRV transformation. */
13296 maybe_save_function_definition (fndecl);
13298 /* Set up the named return value optimization, if we can. Candidate
13299 variables are selected in check_return_expr. */
13300 if (current_function_return_value)
13302 tree r = current_function_return_value;
13305 if (r != error_mark_node
13306 /* This is only worth doing for fns that return in memory--and
13307 simpler, since we don't have to worry about promoted modes. */
13308 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13309 /* Only allow this for variables declared in the outer scope of
13310 the function so we know that their lifetime always ends with a
13311 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13312 we were to do this optimization in tree-ssa. */
13313 && (outer = outer_curly_brace_block (fndecl))
13314 && chain_member (r, BLOCK_VARS (outer)))
13315 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13317 current_function_return_value = NULL_TREE;
13320 /* Remember that we were in class scope. */
13321 if (current_class_name)
13322 ctype = current_class_type;
13324 /* Must mark the RESULT_DECL as being in this function. */
13325 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13327 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13328 to the FUNCTION_DECL node itself. */
13329 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13331 /* Save away current state, if appropriate. */
13332 if (!processing_template_decl)
13333 save_function_data (fndecl);
13335 /* Complain if there's just no return statement. */
13336 if (warn_return_type
13337 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13338 && !dependent_type_p (TREE_TYPE (fntype))
13339 && !current_function_returns_value && !current_function_returns_null
13340 /* Don't complain if we abort or throw. */
13341 && !current_function_returns_abnormally
13342 /* Don't complain if we are declared noreturn. */
13343 && !TREE_THIS_VOLATILE (fndecl)
13344 && !DECL_NAME (DECL_RESULT (fndecl))
13345 && !TREE_NO_WARNING (fndecl)
13346 /* Structor return values (if any) are set by the compiler. */
13347 && !DECL_CONSTRUCTOR_P (fndecl)
13348 && !DECL_DESTRUCTOR_P (fndecl))
13350 warning (OPT_Wreturn_type,
13351 "no return statement in function returning non-void");
13352 TREE_NO_WARNING (fndecl) = 1;
13355 /* Store the end of the function, so that we get good line number
13356 info for the epilogue. */
13357 cfun->function_end_locus = input_location;
13359 /* Complain about parameters that are only set, but never otherwise used. */
13360 if (warn_unused_but_set_parameter
13361 && !processing_template_decl
13362 && errorcount == unused_but_set_errorcount
13363 && !DECL_CLONED_FUNCTION_P (fndecl))
13367 for (decl = DECL_ARGUMENTS (fndecl);
13369 decl = DECL_CHAIN (decl))
13370 if (TREE_USED (decl)
13371 && TREE_CODE (decl) == PARM_DECL
13372 && !DECL_READ_P (decl)
13373 && DECL_NAME (decl)
13374 && !DECL_ARTIFICIAL (decl)
13375 && !TREE_NO_WARNING (decl)
13376 && !DECL_IN_SYSTEM_HEADER (decl)
13377 && TREE_TYPE (decl) != error_mark_node
13378 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13379 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13380 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13381 warning (OPT_Wunused_but_set_parameter,
13382 "parameter %q+D set but not used", decl);
13383 unused_but_set_errorcount = errorcount;
13386 /* Complain about locally defined typedefs that are not used in this
13388 maybe_warn_unused_local_typedefs ();
13390 /* Genericize before inlining. */
13391 if (!processing_template_decl)
13393 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13394 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13395 cp_genericize (fndecl);
13396 /* Clear out the bits we don't need. */
13397 f->x_current_class_ptr = NULL;
13398 f->x_current_class_ref = NULL;
13399 f->x_eh_spec_block = NULL;
13400 f->x_in_charge_parm = NULL;
13401 f->x_vtt_parm = NULL;
13402 f->x_return_value = NULL;
13403 f->bindings = NULL;
13404 f->extern_decl_map = NULL;
13406 /* Clear out the bits we don't need. */
13407 local_names = NULL;
13409 /* We're leaving the context of this function, so zap cfun. It's still in
13410 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13412 current_function_decl = NULL;
13414 /* If this is an in-class inline definition, we may have to pop the
13415 bindings for the template parameters that we added in
13416 maybe_begin_member_template_processing when start_function was
13418 if (inclass_inline)
13419 maybe_end_member_template_processing ();
13421 /* Leave the scope of the class. */
13423 pop_nested_class ();
13428 current_function_decl = NULL_TREE;
13430 defer_mark_used_calls = false;
13431 if (deferred_mark_used_calls)
13436 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13438 VEC_free (tree, gc, deferred_mark_used_calls);
13444 /* Create the FUNCTION_DECL for a function definition.
13445 DECLSPECS and DECLARATOR are the parts of the declaration;
13446 they describe the return type and the name of the function,
13447 but twisted together in a fashion that parallels the syntax of C.
13449 This function creates a binding context for the function body
13450 as well as setting up the FUNCTION_DECL in current_function_decl.
13452 Returns a FUNCTION_DECL on success.
13454 If the DECLARATOR is not suitable for a function (it defines a datum
13455 instead), we return 0, which tells yyparse to report a parse error.
13457 May return void_type_node indicating that this method is actually
13458 a friend. See grokfield for more details.
13460 Came here with a `.pushlevel' .
13462 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13463 CHANGES TO CODE IN `grokfield'. */
13466 grokmethod (cp_decl_specifier_seq *declspecs,
13467 const cp_declarator *declarator, tree attrlist)
13469 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13472 if (fndecl == error_mark_node)
13473 return error_mark_node;
13475 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13477 error ("invalid member function declaration");
13478 return error_mark_node;
13482 cplus_decl_attributes (&fndecl, attrlist, 0);
13484 /* Pass friends other than inline friend functions back. */
13485 if (fndecl == void_type_node)
13488 if (DECL_IN_AGGR_P (fndecl))
13490 if (DECL_CLASS_SCOPE_P (fndecl))
13491 error ("%qD is already defined in class %qT", fndecl,
13492 DECL_CONTEXT (fndecl));
13493 return error_mark_node;
13496 check_template_shadow (fndecl);
13498 DECL_DECLARED_INLINE_P (fndecl) = 1;
13499 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13501 /* We process method specializations in finish_struct_1. */
13502 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13504 fndecl = push_template_decl (fndecl);
13505 if (fndecl == error_mark_node)
13509 if (! DECL_FRIEND_P (fndecl))
13511 if (DECL_CHAIN (fndecl))
13513 fndecl = copy_node (fndecl);
13514 TREE_CHAIN (fndecl) = NULL_TREE;
13518 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13520 DECL_IN_AGGR_P (fndecl) = 1;
13525 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13526 we can lay it out later, when and if its type becomes complete. */
13529 maybe_register_incomplete_var (tree var)
13531 gcc_assert (TREE_CODE (var) == VAR_DECL);
13533 /* Keep track of variables with incomplete types. */
13534 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13535 && DECL_EXTERNAL (var))
13537 tree inner_type = TREE_TYPE (var);
13539 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13540 inner_type = TREE_TYPE (inner_type);
13541 inner_type = TYPE_MAIN_VARIANT (inner_type);
13543 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13544 /* RTTI TD entries are created while defining the type_info. */
13545 || (TYPE_LANG_SPECIFIC (inner_type)
13546 && TYPE_BEING_DEFINED (inner_type)))
13549 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13551 iv->incomplete_type = inner_type;
13556 /* Called when a class type (given by TYPE) is defined. If there are
13557 any existing VAR_DECLs whose type has been completed by this
13558 declaration, update them now. */
13561 complete_vars (tree type)
13564 incomplete_var *iv;
13566 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13568 if (same_type_p (type, iv->incomplete_type))
13570 tree var = iv->decl;
13571 tree type = TREE_TYPE (var);
13572 /* Complete the type of the variable. The VAR_DECL itself
13573 will be laid out in expand_expr. */
13574 complete_type (type);
13575 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13576 /* Remove this entry from the list. */
13577 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13583 /* Check for pending declarations which may have abstract type. */
13584 complete_type_check_abstract (type);
13587 /* If DECL is of a type which needs a cleanup, build and return an
13588 expression to perform that cleanup here. Return NULL_TREE if no
13589 cleanup need be done. */
13592 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13598 /* Assume no cleanup is required. */
13599 cleanup = NULL_TREE;
13601 if (error_operand_p (decl))
13604 /* Handle "__attribute__((cleanup))". We run the cleanup function
13605 before the destructor since the destructor is what actually
13606 terminates the lifetime of the object. */
13607 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13614 /* Get the name specified by the user for the cleanup function. */
13615 id = TREE_VALUE (TREE_VALUE (attr));
13616 /* Look up the name to find the cleanup function to call. It is
13617 important to use lookup_name here because that is what is
13618 used in c-common.c:handle_cleanup_attribute when performing
13619 initial checks on the attribute. Note that those checks
13620 include ensuring that the function found is not an overloaded
13621 function, or an object with an overloaded call operator,
13622 etc.; we can rely on the fact that the function found is an
13623 ordinary FUNCTION_DECL. */
13624 fn = lookup_name (id);
13625 arg = build_address (decl);
13627 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13628 if (cleanup == error_mark_node)
13629 return error_mark_node;
13631 /* Handle ordinary C++ destructors. */
13632 type = TREE_TYPE (decl);
13633 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13635 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13636 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13637 && CLASSTYPE_VBASECLASSES (type));
13641 if (TREE_CODE (type) == ARRAY_TYPE)
13644 addr = build_address (decl);
13646 /* Optimize for space over speed here. */
13647 if (!has_vbases || flag_expensive_optimizations)
13648 flags |= LOOKUP_NONVIRTUAL;
13650 call = build_delete (TREE_TYPE (addr), addr,
13651 sfk_complete_destructor, flags, 0, complain);
13652 if (call == error_mark_node)
13653 cleanup = error_mark_node;
13655 cleanup = cp_build_compound_expr (cleanup, call, complain);
13663 /* When a stmt has been parsed, this function is called. */
13670 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13671 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13672 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13675 static_fn_type (tree memfntype)
13680 if (TYPE_PTRMEMFUNC_P (memfntype))
13681 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13682 if (POINTER_TYPE_P (memfntype)
13683 || TREE_CODE (memfntype) == FUNCTION_DECL)
13684 memfntype = TREE_TYPE (memfntype);
13685 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13687 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13688 args = TYPE_ARG_TYPES (memfntype);
13689 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13690 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13691 fntype = (cp_build_type_attribute_variant
13692 (fntype, TYPE_ATTRIBUTES (memfntype)));
13693 fntype = (build_exception_variant
13694 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13698 /* DECL was originally constructed as a non-static member function,
13699 but turned out to be static. Update it accordingly. */
13702 revert_static_member_fn (tree decl)
13704 tree stype = static_fn_type (decl);
13705 cp_cv_quals quals = type_memfn_quals (stype);
13707 if (quals != TYPE_UNQUALIFIED)
13708 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13710 TREE_TYPE (decl) = stype;
13712 if (DECL_ARGUMENTS (decl))
13713 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13714 DECL_STATIC_FUNCTION_P (decl) = 1;
13717 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13718 one of the language-independent trees. */
13720 enum cp_tree_node_structure_enum
13721 cp_tree_node_structure (union lang_tree_node * t)
13723 switch (TREE_CODE (&t->generic))
13725 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13726 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13727 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13728 case OVERLOAD: return TS_CP_OVERLOAD;
13729 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13730 case PTRMEM_CST: return TS_CP_PTRMEM;
13731 case BASELINK: return TS_CP_BASELINK;
13732 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13733 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13734 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13735 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13736 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13737 default: return TS_CP_GENERIC;
13741 /* Build the void_list_node (void_type_node having been created). */
13743 build_void_list_node (void)
13745 tree t = build_tree_list (NULL_TREE, void_type_node);
13750 cp_missing_noreturn_ok_p (tree decl)
13752 /* A missing noreturn is ok for the `main' function. */
13753 return DECL_MAIN_P (decl);
13756 /* Return the COMDAT group into which DECL should be placed. */
13759 cxx_comdat_group (tree decl)
13763 /* Virtual tables, construction virtual tables, and virtual table
13764 tables all go in a single COMDAT group, named after the primary
13766 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13767 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13768 /* For all other DECLs, the COMDAT group is the mangled name of the
13769 declaration itself. */
13772 while (DECL_THUNK_P (decl))
13774 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13775 into the same section as the target function. In that case
13776 we must return target's name. */
13777 tree target = THUNK_TARGET (decl);
13778 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13779 && DECL_SECTION_NAME (target) != NULL
13780 && DECL_ONE_ONLY (target))
13785 name = DECL_ASSEMBLER_NAME (decl);
13791 #include "gt-cp-decl.h"