1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
47 #include "c-family/c-common.h"
48 #include "c-family/c-objc.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "pointer-set.h"
55 #include "splay-tree.h"
58 /* Possible cases of bad specifiers type used by bad_specifiers. */
60 BSP_VAR, /* variable */
61 BSP_PARM, /* parameter */
66 static tree grokparms (tree parmlist, tree *);
67 static const char *redeclaration_error_message (tree, tree);
69 static int decl_jump_unsafe (tree);
70 static void require_complete_types_for_parms (tree);
71 static int ambi_op_p (enum tree_code);
72 static int unary_op_p (enum tree_code);
73 static void push_local_name (tree);
74 static tree grok_reference_init (tree, tree, tree, int);
75 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
77 static int check_static_variable_definition (tree, tree);
78 static void record_unknown_type (tree, const char *);
79 static tree builtin_function_1 (tree, tree, bool);
80 static tree build_library_fn_1 (tree, enum tree_code, tree);
81 static int member_function_or_else (tree, tree, enum overload_flags);
82 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
84 static void check_for_uninitialized_const_var (tree);
85 static hashval_t typename_hash (const void *);
86 static int typename_compare (const void *, const void *);
87 static tree local_variable_p_walkfn (tree *, int *, void *);
88 static tree record_builtin_java_type (const char *, int);
89 static const char *tag_name (enum tag_types);
90 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
91 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
92 static void maybe_deduce_size_from_array_init (tree, tree);
93 static void layout_var_decl (tree);
94 static tree check_initializer (tree, tree, int, VEC(tree,gc) **);
95 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
96 static void save_function_data (tree);
97 static void copy_type_enum (tree , tree);
98 static void check_function_type (tree, tree);
99 static void finish_constructor_body (void);
100 static void begin_destructor_body (void);
101 static void finish_destructor_body (void);
102 static void record_key_method_defined (tree);
103 static tree create_array_type_for_decl (tree, tree, tree);
104 static tree get_atexit_node (void);
105 static tree get_dso_handle_node (void);
106 static tree start_cleanup_fn (void);
107 static void end_cleanup_fn (void);
108 static tree cp_make_fname_decl (location_t, tree, int);
109 static void initialize_predefined_identifiers (void);
110 static tree check_special_function_return_type
111 (special_function_kind, tree, tree);
112 static tree push_cp_library_fn (enum tree_code, tree);
113 static tree build_cp_library_fn (tree, enum tree_code, tree);
114 static void store_parm_decls (tree);
115 static void initialize_local_var (tree, tree);
116 static void expand_static_init (tree, tree);
118 /* The following symbols are subsumed in the cp_global_trees array, and
119 listed here individually for documentation purposes.
122 tree wchar_decl_node;
124 tree vtable_entry_type;
125 tree delta_type_node;
126 tree __t_desc_type_node;
128 tree class_type_node;
129 tree unknown_type_node;
131 Array type `vtable_entry_type[]'
134 tree vtbl_ptr_type_node;
141 A FUNCTION_DECL which can call `abort'. Not necessarily the
142 one that the user will declare, but sufficient to be called
143 by routines that want to abort the program.
147 The FUNCTION_DECL for the default `::operator delete'.
149 tree global_delete_fndecl;
152 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
153 tree tinfo_var_id; */
155 tree cp_global_trees[CPTI_MAX];
157 /* Indicates that there is a type value in some namespace, although
158 that is not necessarily in scope at the moment. */
160 tree global_type_node;
162 /* The node that holds the "name" of the global scope. */
163 tree global_scope_name;
165 #define local_names cp_function_chain->x_local_names
167 /* A list of objects which have constructors or destructors
168 which reside in the global scope. The decl is stored in
169 the TREE_VALUE slot and the initializer is stored
170 in the TREE_PURPOSE slot. */
171 tree static_aggregates;
175 /* A node for the integer constant 2. */
177 tree integer_two_node;
179 /* Used only for jumps to as-yet undefined labels, since jumps to
180 defined labels can have their validity checked immediately. */
182 struct GTY((chain_next ("%h.next"))) named_label_use_entry {
183 struct named_label_use_entry *next;
184 /* The binding level to which this entry is *currently* attached.
185 This is initially the binding level in which the goto appeared,
186 but is modified as scopes are closed. */
187 cp_binding_level *binding_level;
188 /* The head of the names list that was current when the goto appeared,
189 or the inner scope popped. These are the decls that will *not* be
190 skipped when jumping to the label. */
192 /* The location of the goto, for error reporting. */
193 location_t o_goto_locus;
194 /* True if an OpenMP structured block scope has been closed since
195 the goto appeared. This means that the branch from the label will
196 illegally exit an OpenMP scope. */
200 /* A list of all LABEL_DECLs in the function that have names. Here so
201 we can clear out their names' definitions at the end of the
202 function, and so we can check the validity of jumps to these labels. */
204 struct GTY(()) named_label_entry {
205 /* The decl itself. */
208 /* The binding level to which the label is *currently* attached.
209 This is initially set to the binding level in which the label
210 is defined, but is modified as scopes are closed. */
211 cp_binding_level *binding_level;
212 /* The head of the names list that was current when the label was
213 defined, or the inner scope popped. These are the decls that will
214 be skipped when jumping to the label. */
216 /* A vector of all decls from all binding levels that would be
217 crossed by a backward branch to the label. */
218 VEC(tree,gc) *bad_decls;
220 /* A list of uses of the label, before the label is defined. */
221 struct named_label_use_entry *uses;
223 /* The following bits are set after the label is defined, and are
224 updated as scopes are popped. They indicate that a backward jump
225 to the label will illegally enter a scope of the given flavor. */
231 #define named_labels cp_function_chain->x_named_labels
233 /* The number of function bodies which we are currently processing.
234 (Zero if we are at namespace scope, one inside the body of a
235 function, two inside the body of a function in a local class, etc.) */
238 /* To avoid unwanted recursion, finish_function defers all mark_used calls
239 encountered during its execution until it finishes. */
240 bool defer_mark_used_calls;
241 VEC(tree, gc) *deferred_mark_used_calls;
243 /* States indicating how grokdeclarator() should handle declspecs marked
244 with __attribute__((deprecated)). An object declared as
245 __attribute__((deprecated)) suppresses warnings of uses of other
247 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
250 /* A list of VAR_DECLs whose type was incomplete at the time the
251 variable was declared. */
253 typedef struct GTY(()) incomplete_var_d {
255 tree incomplete_type;
258 DEF_VEC_O(incomplete_var);
259 DEF_VEC_ALLOC_O(incomplete_var,gc);
261 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
263 /* Returns the kind of template specialization we are currently
264 processing, given that it's declaration contained N_CLASS_SCOPES
265 explicit scope qualifications. */
268 current_tmpl_spec_kind (int n_class_scopes)
270 int n_template_parm_scopes = 0;
271 int seen_specialization_p = 0;
272 int innermost_specialization_p = 0;
275 /* Scan through the template parameter scopes. */
276 for (b = current_binding_level;
277 b->kind == sk_template_parms;
280 /* If we see a specialization scope inside a parameter scope,
281 then something is wrong. That corresponds to a declaration
284 template <class T> template <> ...
286 which is always invalid since [temp.expl.spec] forbids the
287 specialization of a class member template if the enclosing
288 class templates are not explicitly specialized as well. */
289 if (b->explicit_spec_p)
291 if (n_template_parm_scopes == 0)
292 innermost_specialization_p = 1;
294 seen_specialization_p = 1;
296 else if (seen_specialization_p == 1)
297 return tsk_invalid_member_spec;
299 ++n_template_parm_scopes;
302 /* Handle explicit instantiations. */
303 if (processing_explicit_instantiation)
305 if (n_template_parm_scopes != 0)
306 /* We've seen a template parameter list during an explicit
307 instantiation. For example:
309 template <class T> template void f(int);
311 This is erroneous. */
312 return tsk_invalid_expl_inst;
314 return tsk_expl_inst;
317 if (n_template_parm_scopes < n_class_scopes)
318 /* We've not seen enough template headers to match all the
319 specialized classes present. For example:
321 template <class T> void R<T>::S<T>::f(int);
323 This is invalid; there needs to be one set of template
324 parameters for each class. */
325 return tsk_insufficient_parms;
326 else if (n_template_parm_scopes == n_class_scopes)
327 /* We're processing a non-template declaration (even though it may
328 be a member of a template class.) For example:
330 template <class T> void S<T>::f(int);
332 The `class T' matches the `S<T>', leaving no template headers
333 corresponding to the `f'. */
335 else if (n_template_parm_scopes > n_class_scopes + 1)
336 /* We've got too many template headers. For example:
338 template <> template <class T> void f (T);
340 There need to be more enclosing classes. */
341 return tsk_excessive_parms;
343 /* This must be a template. It's of the form:
345 template <class T> template <class U> void S<T>::f(U);
347 This is a specialization if the innermost level was a
348 specialization; otherwise it's just a definition of the
350 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
353 /* Exit the current scope. */
361 /* When a label goes out of scope, check to see if that label was used
362 in a valid manner, and issue any appropriate warnings or errors. */
365 pop_label (tree label, tree old_value)
367 if (!processing_template_decl)
369 if (DECL_INITIAL (label) == NULL_TREE)
373 error ("label %q+D used but not defined", label);
374 location = input_location; /* FIXME want (input_filename, (line)0) */
375 /* Avoid crashing later. */
376 define_label (location, DECL_NAME (label));
379 warn_for_unused_label (label);
382 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
385 /* At the end of a function, all labels declared within the function
386 go out of scope. BLOCK is the top-level block for the
390 pop_labels_1 (void **slot, void *data)
392 struct named_label_entry *ent = (struct named_label_entry *) *slot;
393 tree block = (tree) data;
395 pop_label (ent->label_decl, NULL_TREE);
397 /* Put the labels into the "variables" of the top-level block,
398 so debugger can see them. */
399 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
400 BLOCK_VARS (block) = ent->label_decl;
402 htab_clear_slot (named_labels, slot);
408 pop_labels (tree block)
412 htab_traverse (named_labels, pop_labels_1, block);
417 /* At the end of a block with local labels, restore the outer definition. */
420 pop_local_label (tree label, tree old_value)
422 struct named_label_entry dummy;
425 pop_label (label, old_value);
427 dummy.label_decl = label;
428 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
429 htab_clear_slot (named_labels, slot);
432 /* The following two routines are used to interface to Objective-C++.
433 The binding level is purposely treated as an opaque type. */
436 objc_get_current_scope (void)
438 return current_binding_level;
441 /* The following routine is used by the NeXT-style SJLJ exceptions;
442 variables get marked 'volatile' so as to not be clobbered by
443 _setjmp()/_longjmp() calls. All variables in the current scope,
444 as well as parent scopes up to (but not including) ENCLOSING_BLK
445 shall be thusly marked. */
448 objc_mark_locals_volatile (void *enclosing_blk)
450 cp_binding_level *scope;
452 for (scope = current_binding_level;
453 scope && scope != enclosing_blk;
454 scope = scope->level_chain)
458 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
459 objc_volatilize_decl (decl);
461 /* Do not climb up past the current function. */
462 if (scope->kind == sk_function_parms)
467 /* Update data for defined and undefined labels when leaving a scope. */
470 poplevel_named_label_1 (void **slot, void *data)
472 struct named_label_entry *ent = (struct named_label_entry *) *slot;
473 cp_binding_level *bl = (cp_binding_level *) data;
474 cp_binding_level *obl = bl->level_chain;
476 if (ent->binding_level == bl)
480 /* ENT->NAMES_IN_SCOPE may contain a mixture of DECLs and
481 TREE_LISTs representing OVERLOADs, so be careful. */
482 for (decl = ent->names_in_scope; decl; decl = (DECL_P (decl)
484 : TREE_CHAIN (decl)))
485 if (decl_jump_unsafe (decl))
486 VEC_safe_push (tree, gc, ent->bad_decls, decl);
488 ent->binding_level = obl;
489 ent->names_in_scope = obl->names;
493 ent->in_try_scope = true;
496 ent->in_catch_scope = true;
499 ent->in_omp_scope = true;
507 struct named_label_use_entry *use;
509 for (use = ent->uses; use ; use = use->next)
510 if (use->binding_level == bl)
512 use->binding_level = obl;
513 use->names_in_scope = obl->names;
514 if (bl->kind == sk_omp)
515 use->in_omp_scope = true;
522 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
523 when errors were reported, except for -Werror-unused-but-set-*. */
524 static int unused_but_set_errorcount;
526 /* Exit a binding level.
527 Pop the level off, and restore the state of the identifier-decl mappings
528 that were in effect when this level was entered.
530 If KEEP == 1, this level had explicit declarations, so
531 and create a "block" (a BLOCK node) for the level
532 to record its declarations and subblocks for symbol table output.
534 If FUNCTIONBODY is nonzero, this level is the body of a function,
535 so create a block as if KEEP were set and also clear out all
538 If REVERSE is nonzero, reverse the order of decls before putting
539 them into the BLOCK. */
542 poplevel (int keep, int reverse, int functionbody)
545 /* The chain of decls was accumulated in reverse order.
546 Put it into forward order, just for cleanliness. */
551 int leaving_for_scope;
554 cp_label_binding *label_bind;
556 timevar_start (TV_NAME_LOOKUP);
561 gcc_assert (current_binding_level->kind != sk_class);
563 if (current_binding_level->kind == sk_cleanup)
565 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
567 gcc_assert (!VEC_length(cp_class_binding,
568 current_binding_level->class_shadowed));
570 /* We used to use KEEP == 2 to indicate that the new block should go
571 at the beginning of the list of blocks at this binding level,
572 rather than the end. This hack is no longer used. */
573 gcc_assert (keep == 0 || keep == 1);
575 if (current_binding_level->keep)
578 /* Any uses of undefined labels, and any defined labels, now operate
579 under constraints of next binding contour. */
580 if (cfun && !functionbody && named_labels)
581 htab_traverse (named_labels, poplevel_named_label_1,
582 current_binding_level);
584 /* Get the decls in the order they were written.
585 Usually current_binding_level->names is in reverse order.
586 But parameter decls were previously put in forward order. */
589 current_binding_level->names
590 = decls = nreverse (current_binding_level->names);
592 decls = current_binding_level->names;
594 /* If there were any declarations or structure tags in that level,
595 or if this level is a function body,
596 create a BLOCK to record them for the life of this function. */
598 if (keep == 1 || functionbody)
599 block = make_node (BLOCK);
600 if (block != NULL_TREE)
602 BLOCK_VARS (block) = decls;
603 BLOCK_SUBBLOCKS (block) = subblocks;
606 /* In each subblock, record that this is its superior. */
608 for (link = subblocks; link; link = BLOCK_CHAIN (link))
609 BLOCK_SUPERCONTEXT (link) = block;
611 /* We still support the old for-scope rules, whereby the variables
612 in a for-init statement were in scope after the for-statement
613 ended. We only use the new rules if flag_new_for_scope is
616 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
618 /* Before we remove the declarations first check for unused variables. */
619 if ((warn_unused_variable || warn_unused_but_set_variable)
620 && !processing_template_decl)
621 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
622 if (TREE_CODE (decl) == VAR_DECL
623 && (! TREE_USED (decl) || !DECL_READ_P (decl))
624 && ! DECL_IN_SYSTEM_HEADER (decl)
625 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
627 if (! TREE_USED (decl))
628 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
629 else if (DECL_CONTEXT (decl) == current_function_decl
630 && TREE_TYPE (decl) != error_mark_node
631 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
632 && errorcount == unused_but_set_errorcount
633 && (!CLASS_TYPE_P (TREE_TYPE (decl))
634 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
636 warning (OPT_Wunused_but_set_variable,
637 "variable %q+D set but not used", decl);
638 unused_but_set_errorcount = errorcount;
642 /* Remove declarations for all the DECLs in this level. */
643 for (link = decls; link; link = TREE_CHAIN (link))
645 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
646 /* It's hard to make this ARM compatibility hack play nicely with
647 lambdas, and it really isn't necessary in C++11 mode. */
648 && cxx_dialect < cxx0x
651 tree name = DECL_NAME (link);
655 ob = outer_binding (name,
656 IDENTIFIER_BINDING (name),
659 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
661 ns_binding = NULL_TREE;
663 if (ob && ob->scope == current_binding_level->level_chain)
664 /* We have something like:
669 and we are leaving the `for' scope. There's no reason to
670 keep the binding of the inner `i' in this case. */
671 pop_binding (name, link);
672 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
673 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
674 /* Here, we have something like:
682 We must pop the for-scope binding so we know what's a
683 type and what isn't. */
684 pop_binding (name, link);
687 /* Mark this VAR_DECL as dead so that we can tell we left it
688 there only for backward compatibility. */
689 DECL_DEAD_FOR_LOCAL (link) = 1;
691 /* Keep track of what should have happened when we
692 popped the binding. */
695 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
696 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
699 /* Add it to the list of dead variables in the next
700 outermost binding to that we can remove these when we
701 leave that binding. */
702 VEC_safe_push (tree, gc,
703 current_binding_level->level_chain->dead_vars_from_for,
706 /* Although we don't pop the cxx_binding, we do clear
707 its SCOPE since the scope is going away now. */
708 IDENTIFIER_BINDING (name)->scope
709 = current_binding_level->level_chain;
716 /* Remove the binding. */
719 if (TREE_CODE (decl) == TREE_LIST)
720 decl = TREE_VALUE (decl);
723 if (TREE_CODE (name) == OVERLOAD)
724 name = OVL_FUNCTION (name);
726 gcc_assert (DECL_P (name));
727 pop_binding (DECL_NAME (name), decl);
731 /* Remove declarations for any `for' variables from inner scopes
732 that we kept around. */
733 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
735 pop_binding (DECL_NAME (decl), decl);
737 /* Restore the IDENTIFIER_TYPE_VALUEs. */
738 for (link = current_binding_level->type_shadowed;
739 link; link = TREE_CHAIN (link))
740 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
742 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
743 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
744 current_binding_level->shadowed_labels,
746 pop_local_label (label_bind->label, label_bind->prev_value);
748 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
749 list if a `using' declaration put them there. The debugging
750 back ends won't understand OVERLOAD, so we remove them here.
751 Because the BLOCK_VARS are (temporarily) shared with
752 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
753 popped all the bindings. */
758 for (d = &BLOCK_VARS (block); *d; )
760 if (TREE_CODE (*d) == TREE_LIST)
761 *d = TREE_CHAIN (*d);
763 d = &DECL_CHAIN (*d);
767 /* If the level being exited is the top level of a function,
768 check over all the labels. */
771 /* Since this is the top level block of a function, the vars are
772 the function's parameters. Don't leave them in the BLOCK
773 because they are found in the FUNCTION_DECL instead. */
774 BLOCK_VARS (block) = 0;
778 kind = current_binding_level->kind;
779 if (kind == sk_cleanup)
783 /* If this is a temporary binding created for a cleanup, then we'll
784 have pushed a statement list level. Pop that, create a new
785 BIND_EXPR for the block, and insert it into the stream. */
786 stmt = pop_stmt_list (current_binding_level->statement_list);
787 stmt = c_build_bind_expr (input_location, block, stmt);
794 /* The current function is being defined, so its DECL_INITIAL
795 should be error_mark_node. */
796 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
797 DECL_INITIAL (current_function_decl) = block;
800 current_binding_level->blocks
801 = block_chainon (current_binding_level->blocks, block);
803 /* If we did not make a block for the level just exited,
804 any blocks made for inner levels
805 (since they cannot be recorded as subblocks in that level)
806 must be carried forward so they will later become subblocks
807 of something else. */
809 current_binding_level->blocks
810 = block_chainon (current_binding_level->blocks, subblocks);
812 /* Each and every BLOCK node created here in `poplevel' is important
813 (e.g. for proper debugging information) so if we created one
814 earlier, mark it as "used". */
816 TREE_USED (block) = 1;
818 /* All temporary bindings created for cleanups are popped silently. */
819 if (kind == sk_cleanup)
822 timevar_stop (TV_NAME_LOOKUP);
826 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
827 itself, calling F for each. The DATA is passed to F as well. */
830 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
833 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
835 result |= (*f) (name_space, data);
837 for (; current; current = DECL_CHAIN (current))
838 result |= walk_namespaces_r (current, f, data);
843 /* Walk all the namespaces, calling F for each. The DATA is passed to
847 walk_namespaces (walk_namespaces_fn f, void* data)
849 return walk_namespaces_r (global_namespace, f, data);
852 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
853 DATA is non-NULL, this is the last time we will call
854 wrapup_global_declarations for this NAMESPACE. */
857 wrapup_globals_for_namespace (tree name_space, void* data)
859 cp_binding_level *level = NAMESPACE_LEVEL (name_space);
860 VEC(tree,gc) *statics = level->static_decls;
861 tree *vec = VEC_address (tree, statics);
862 int len = VEC_length (tree, statics);
863 int last_time = (data != 0);
867 check_global_declarations (vec, len);
868 emit_debug_global_declarations (vec, len);
872 /* Write out any globals that need to be output. */
873 return wrapup_global_declarations (vec, len);
877 /* In C++, you don't have to write `struct S' to refer to `S'; you
878 can just use `S'. We accomplish this by creating a TYPE_DECL as
879 if the user had written `typedef struct S S'. Create and return
880 the TYPE_DECL for TYPE. */
883 create_implicit_typedef (tree name, tree type)
887 decl = build_decl (input_location, TYPE_DECL, name, type);
888 DECL_ARTIFICIAL (decl) = 1;
889 /* There are other implicit type declarations, like the one *within*
890 a class that allows you to write `S::S'. We must distinguish
892 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
893 TYPE_NAME (type) = decl;
894 TYPE_STUB_DECL (type) = decl;
899 /* Remember a local name for name-mangling purposes. */
902 push_local_name (tree decl)
907 timevar_start (TV_NAME_LOOKUP);
909 name = DECL_NAME (decl);
911 nelts = VEC_length (tree, local_names);
912 for (i = 0; i < nelts; i++)
914 t = VEC_index (tree, local_names, i);
915 if (DECL_NAME (t) == name)
917 if (!DECL_LANG_SPECIFIC (decl))
918 retrofit_lang_decl (decl);
919 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
920 if (DECL_LANG_SPECIFIC (t))
921 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
923 DECL_DISCRIMINATOR (decl) = 1;
925 VEC_replace (tree, local_names, i, decl);
926 timevar_stop (TV_NAME_LOOKUP);
931 VEC_safe_push (tree, gc, local_names, decl);
932 timevar_stop (TV_NAME_LOOKUP);
935 /* Subroutine of duplicate_decls: return truthvalue of whether
936 or not types of these decls match.
938 For C++, we must compare the parameter list so that `int' can match
939 `int&' in a parameter position, but `int&' is not confused with
943 decls_match (tree newdecl, tree olddecl)
947 if (newdecl == olddecl)
950 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
951 /* If the two DECLs are not even the same kind of thing, we're not
952 interested in their types. */
955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
957 tree f1 = TREE_TYPE (newdecl);
958 tree f2 = TREE_TYPE (olddecl);
959 tree p1 = TYPE_ARG_TYPES (f1);
960 tree p2 = TYPE_ARG_TYPES (f2);
962 /* Specializations of different templates are different functions
963 even if they have the same type. */
964 tree t1 = (DECL_USE_TEMPLATE (newdecl)
965 ? DECL_TI_TEMPLATE (newdecl)
967 tree t2 = (DECL_USE_TEMPLATE (olddecl)
968 ? DECL_TI_TEMPLATE (olddecl)
973 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
974 && ! (DECL_EXTERN_C_P (newdecl)
975 && DECL_EXTERN_C_P (olddecl)))
978 #ifdef NO_IMPLICIT_EXTERN_C
979 /* A new declaration doesn't match a built-in one unless it
980 is also extern "C". */
981 if (DECL_IS_BUILTIN (olddecl)
982 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
986 if (TREE_CODE (f1) != TREE_CODE (f2))
989 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
991 if (!prototype_p (f2) && DECL_EXTERN_C_P (olddecl)
992 && (DECL_BUILT_IN (olddecl)
993 #ifndef NO_IMPLICIT_EXTERN_C
994 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
995 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
999 types_match = self_promoting_args_p (p1);
1000 if (p1 == void_list_node)
1001 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1003 #ifndef NO_IMPLICIT_EXTERN_C
1004 else if (!prototype_p (f1)
1005 && (DECL_EXTERN_C_P (olddecl)
1006 && DECL_IN_SYSTEM_HEADER (olddecl)
1007 && !DECL_CLASS_SCOPE_P (olddecl))
1008 && (DECL_EXTERN_C_P (newdecl)
1009 && DECL_IN_SYSTEM_HEADER (newdecl)
1010 && !DECL_CLASS_SCOPE_P (newdecl)))
1012 types_match = self_promoting_args_p (p2);
1013 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1019 && (TYPE_ATTRIBUTES (TREE_TYPE (newdecl)) == NULL_TREE
1020 || comp_type_attributes (TREE_TYPE (newdecl),
1021 TREE_TYPE (olddecl)) != 0);
1026 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1028 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1029 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1032 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1033 DECL_TEMPLATE_PARMS (olddecl)))
1036 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1037 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1038 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1040 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1041 DECL_TEMPLATE_RESULT (newdecl));
1045 /* Need to check scope for variable declaration (VAR_DECL).
1046 For typedef (TYPE_DECL), scope is ignored. */
1047 if (TREE_CODE (newdecl) == VAR_DECL
1048 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1050 Two declarations for an object with C language linkage
1051 with the same name (ignoring the namespace that qualify
1052 it) that appear in different namespace scopes refer to
1054 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1057 if (TREE_TYPE (newdecl) == error_mark_node)
1058 types_match = TREE_TYPE (olddecl) == error_mark_node;
1059 else if (TREE_TYPE (olddecl) == NULL_TREE)
1060 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1061 else if (TREE_TYPE (newdecl) == NULL_TREE)
1064 types_match = comptypes (TREE_TYPE (newdecl),
1065 TREE_TYPE (olddecl),
1066 COMPARE_REDECLARATION);
1072 /* If NEWDECL is `static' and an `extern' was seen previously,
1073 warn about it. OLDDECL is the previous declaration.
1075 Note that this does not apply to the C++ case of declaring
1076 a variable `extern const' and then later `const'.
1078 Don't complain about built-in functions, since they are beyond
1079 the user's control. */
1082 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1084 if (TREE_CODE (newdecl) == TYPE_DECL
1085 || TREE_CODE (newdecl) == TEMPLATE_DECL
1086 || TREE_CODE (newdecl) == CONST_DECL
1087 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1090 /* Don't get confused by static member functions; that's a different
1092 if (TREE_CODE (newdecl) == FUNCTION_DECL
1093 && DECL_STATIC_FUNCTION_P (newdecl))
1096 /* If the old declaration was `static', or the new one isn't, then
1097 everything is OK. */
1098 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1101 /* It's OK to declare a builtin function as `static'. */
1102 if (TREE_CODE (olddecl) == FUNCTION_DECL
1103 && DECL_ARTIFICIAL (olddecl))
1106 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1107 permerror (input_location, "previous declaration of %q+D", olddecl);
1110 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1111 function templates. If their exception specifications do not
1112 match, issue a diagnostic. */
1115 check_redeclaration_exception_specification (tree new_decl,
1120 tree new_exceptions;
1121 tree old_exceptions;
1123 new_type = TREE_TYPE (new_decl);
1124 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1125 old_type = TREE_TYPE (old_decl);
1126 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1130 If any declaration of a function has an exception-specification,
1131 all declarations, including the definition and an explicit
1132 specialization, of that function shall have an
1133 exception-specification with the same set of type-ids. */
1134 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1135 && ! DECL_IS_BUILTIN (old_decl)
1137 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1139 error ("declaration of %qF has a different exception specifier",
1141 error ("from previous declaration %q+F", old_decl);
1145 /* Return true if OLD_DECL and NEW_DECL agree on constexprness.
1146 Otherwise issue diagnostics. */
1149 validate_constexpr_redeclaration (tree old_decl, tree new_decl)
1151 old_decl = STRIP_TEMPLATE (old_decl);
1152 new_decl = STRIP_TEMPLATE (new_decl);
1153 if (!VAR_OR_FUNCTION_DECL_P (old_decl)
1154 || !VAR_OR_FUNCTION_DECL_P (new_decl))
1156 if (DECL_DECLARED_CONSTEXPR_P (old_decl)
1157 == DECL_DECLARED_CONSTEXPR_P (new_decl))
1159 if (TREE_CODE (old_decl) == FUNCTION_DECL && DECL_BUILT_IN (old_decl))
1161 /* Hide a built-in declaration. */
1162 DECL_DECLARED_CONSTEXPR_P (old_decl)
1163 = DECL_DECLARED_CONSTEXPR_P (new_decl);
1166 error ("redeclaration %qD differs in %<constexpr%>", new_decl);
1167 error ("from previous declaration %q+D", old_decl);
1171 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1172 && lookup_attribute ("gnu_inline", \
1173 DECL_ATTRIBUTES (fn)))
1175 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1176 If the redeclaration is invalid, a diagnostic is issued, and the
1177 error_mark_node is returned. Otherwise, OLDDECL is returned.
1179 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1182 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1185 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1187 unsigned olddecl_uid = DECL_UID (olddecl);
1188 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1189 int new_defines_function = 0;
1190 tree new_template_info;
1192 if (newdecl == olddecl)
1195 types_match = decls_match (newdecl, olddecl);
1197 /* If either the type of the new decl or the type of the old decl is an
1198 error_mark_node, then that implies that we have already issued an
1199 error (earlier) for some bogus type specification, and in that case,
1200 it is rather pointless to harass the user with yet more error message
1201 about the same declaration, so just pretend the types match here. */
1202 if (TREE_TYPE (newdecl) == error_mark_node
1203 || TREE_TYPE (olddecl) == error_mark_node)
1204 return error_mark_node;
1206 if (UDLIT_OPER_P (DECL_NAME (newdecl))
1207 && UDLIT_OPER_P (DECL_NAME (olddecl)))
1209 if (TREE_CODE (newdecl) == TEMPLATE_DECL
1210 && TREE_CODE (olddecl) != TEMPLATE_DECL
1211 && check_raw_literal_operator (olddecl))
1212 error ("literal operator template %q+D conflicts with"
1213 " raw literal operator %qD", newdecl, olddecl);
1214 else if (TREE_CODE (newdecl) != TEMPLATE_DECL
1215 && TREE_CODE (olddecl) == TEMPLATE_DECL
1216 && check_raw_literal_operator (newdecl))
1217 error ("raw literal operator %q+D conflicts with"
1218 " literal operator template %qD", newdecl, olddecl);
1221 if (DECL_P (olddecl)
1222 && TREE_CODE (newdecl) == FUNCTION_DECL
1223 && TREE_CODE (olddecl) == FUNCTION_DECL
1224 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1226 if (DECL_DECLARED_INLINE_P (newdecl)
1227 && DECL_UNINLINABLE (newdecl)
1228 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1229 /* Already warned elsewhere. */;
1230 else if (DECL_DECLARED_INLINE_P (olddecl)
1231 && DECL_UNINLINABLE (olddecl)
1232 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1233 /* Already warned. */;
1234 else if (DECL_DECLARED_INLINE_P (newdecl)
1235 && DECL_UNINLINABLE (olddecl)
1236 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1238 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1240 warning (OPT_Wattributes, "previous declaration of %q+D "
1241 "with attribute noinline", olddecl);
1243 else if (DECL_DECLARED_INLINE_P (olddecl)
1244 && DECL_UNINLINABLE (newdecl)
1245 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1247 warning (OPT_Wattributes, "function %q+D redeclared with "
1248 "attribute noinline", newdecl);
1249 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1254 /* Check for redeclaration and other discrepancies. */
1255 if (TREE_CODE (olddecl) == FUNCTION_DECL
1256 && DECL_ARTIFICIAL (olddecl))
1258 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1259 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1261 /* Avoid warnings redeclaring built-ins which have not been
1262 explicitly declared. */
1263 if (DECL_ANTICIPATED (olddecl))
1266 /* If you declare a built-in or predefined function name as static,
1267 the old definition is overridden, but optionally warn this was a
1268 bad choice of name. */
1269 if (! TREE_PUBLIC (newdecl))
1271 warning (OPT_Wshadow,
1272 DECL_BUILT_IN (olddecl)
1273 ? G_("shadowing built-in function %q#D")
1274 : G_("shadowing library function %q#D"), olddecl);
1275 /* Discard the old built-in function. */
1278 /* If the built-in is not ansi, then programs can override
1279 it even globally without an error. */
1280 else if (! DECL_BUILT_IN (olddecl))
1281 warning (0, "library function %q#D redeclared as non-function %q#D",
1285 error ("declaration of %q#D", newdecl);
1286 error ("conflicts with built-in declaration %q#D",
1291 else if (!types_match)
1293 /* Avoid warnings redeclaring built-ins which have not been
1294 explicitly declared. */
1295 if (DECL_ANTICIPATED (olddecl))
1297 /* Deal with fileptr_type_node. FILE type is not known
1298 at the time we create the builtins. */
1301 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1302 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1304 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1307 else if (TREE_VALUE (t2) == fileptr_type_node)
1309 tree t = TREE_VALUE (t1);
1311 if (TREE_CODE (t) == POINTER_TYPE
1312 && TYPE_NAME (TREE_TYPE (t))
1313 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1314 == get_identifier ("FILE")
1315 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1317 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1319 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1320 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1321 types_match = decls_match (newdecl, olddecl);
1323 return duplicate_decls (newdecl, olddecl,
1325 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1328 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1331 else if ((DECL_EXTERN_C_P (newdecl)
1332 && DECL_EXTERN_C_P (olddecl))
1333 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1334 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1336 /* A near match; override the builtin. */
1338 if (TREE_PUBLIC (newdecl))
1340 warning (0, "new declaration %q#D", newdecl);
1341 warning (0, "ambiguates built-in declaration %q#D",
1345 warning (OPT_Wshadow,
1346 DECL_BUILT_IN (olddecl)
1347 ? G_("shadowing built-in function %q#D")
1348 : G_("shadowing library function %q#D"), olddecl);
1351 /* Discard the old built-in function. */
1354 /* Replace the old RTL to avoid problems with inlining. */
1355 COPY_DECL_RTL (newdecl, olddecl);
1357 /* Even if the types match, prefer the new declarations type for
1358 built-ins which have not been explicitly declared, for
1359 exception lists, etc... */
1360 else if (DECL_IS_BUILTIN (olddecl))
1362 tree type = TREE_TYPE (newdecl);
1363 tree attribs = (*targetm.merge_type_attributes)
1364 (TREE_TYPE (olddecl), type);
1366 type = cp_build_type_attribute_variant (type, attribs);
1367 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1370 /* If a function is explicitly declared "throw ()", propagate that to
1371 the corresponding builtin. */
1372 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1373 && DECL_ANTICIPATED (olddecl)
1374 && TREE_NOTHROW (newdecl)
1375 && !TREE_NOTHROW (olddecl))
1377 enum built_in_function fncode = DECL_FUNCTION_CODE (olddecl);
1378 tree tmpdecl = builtin_decl_explicit (fncode);
1379 if (tmpdecl && tmpdecl != olddecl && types_match)
1380 TREE_NOTHROW (tmpdecl) = 1;
1383 /* Whether or not the builtin can throw exceptions has no
1384 bearing on this declarator. */
1385 TREE_NOTHROW (olddecl) = 0;
1387 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1389 /* If a builtin function is redeclared as `static', merge
1390 the declarations, but make the original one static. */
1391 DECL_THIS_STATIC (olddecl) = 1;
1392 TREE_PUBLIC (olddecl) = 0;
1394 /* Make the old declaration consistent with the new one so
1395 that all remnants of the builtin-ness of this function
1396 will be banished. */
1397 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1398 COPY_DECL_RTL (newdecl, olddecl);
1401 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1403 /* C++ Standard, 3.3, clause 4:
1404 "[Note: a namespace name or a class template name must be unique
1405 in its declarative region (7.3.2, clause 14). ]" */
1406 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1407 && TREE_CODE (newdecl) != NAMESPACE_DECL
1408 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1409 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1410 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1411 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1413 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1414 && TREE_CODE (newdecl) != TYPE_DECL)
1415 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1416 && TREE_CODE (olddecl) != TYPE_DECL))
1418 /* We do nothing special here, because C++ does such nasty
1419 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1420 get shadowed, and know that if we need to find a TYPE_DECL
1421 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1422 slot of the identifier. */
1426 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1427 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1428 || (TREE_CODE (olddecl) == FUNCTION_DECL
1429 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1433 error ("%q#D redeclared as different kind of symbol", newdecl);
1434 if (TREE_CODE (olddecl) == TREE_LIST)
1435 olddecl = TREE_VALUE (olddecl);
1436 error ("previous declaration of %q+#D", olddecl);
1438 return error_mark_node;
1440 else if (!types_match)
1442 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1443 /* These are certainly not duplicate declarations; they're
1444 from different scopes. */
1447 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1449 /* The name of a class template may not be declared to refer to
1450 any other template, class, function, object, namespace, value,
1451 or type in the same scope. */
1452 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1453 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1455 error ("declaration of template %q#D", newdecl);
1456 error ("conflicts with previous declaration %q+#D", olddecl);
1458 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1459 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1460 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1461 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1462 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1463 DECL_TEMPLATE_PARMS (olddecl))
1464 /* Template functions can be disambiguated by
1466 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1467 TREE_TYPE (TREE_TYPE (olddecl))))
1469 error ("new declaration %q#D", newdecl);
1470 error ("ambiguates old declaration %q+#D", olddecl);
1474 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1476 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1478 error ("declaration of C function %q#D conflicts with",
1480 error ("previous declaration %q+#D here", olddecl);
1483 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1484 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1486 error ("new declaration %q#D", newdecl);
1487 error ("ambiguates old declaration %q+#D", olddecl);
1488 return error_mark_node;
1495 error ("conflicting declaration %q#D", newdecl);
1496 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1497 return error_mark_node;
1500 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1501 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1502 && (!DECL_TEMPLATE_INFO (newdecl)
1503 || (DECL_TI_TEMPLATE (newdecl)
1504 != DECL_TI_TEMPLATE (olddecl))))
1505 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1506 && (!DECL_TEMPLATE_INFO (olddecl)
1507 || (DECL_TI_TEMPLATE (olddecl)
1508 != DECL_TI_TEMPLATE (newdecl))))))
1509 /* It's OK to have a template specialization and a non-template
1510 with the same type, or to have specializations of two
1511 different templates with the same type. Note that if one is a
1512 specialization, and the other is an instantiation of the same
1513 template, that we do not exit at this point. That situation
1514 can occur if we instantiate a template class, and then
1515 specialize one of its methods. This situation is valid, but
1516 the declarations must be merged in the usual way. */
1518 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1519 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1520 && !DECL_USE_TEMPLATE (newdecl))
1521 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1522 && !DECL_USE_TEMPLATE (olddecl))))
1523 /* One of the declarations is a template instantiation, and the
1524 other is not a template at all. That's OK. */
1526 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1528 /* In [namespace.alias] we have:
1530 In a declarative region, a namespace-alias-definition can be
1531 used to redefine a namespace-alias declared in that declarative
1532 region to refer only to the namespace to which it already
1535 Therefore, if we encounter a second alias directive for the same
1536 alias, we can just ignore the second directive. */
1537 if (DECL_NAMESPACE_ALIAS (newdecl)
1538 && (DECL_NAMESPACE_ALIAS (newdecl)
1539 == DECL_NAMESPACE_ALIAS (olddecl)))
1541 /* [namespace.alias]
1543 A namespace-name or namespace-alias shall not be declared as
1544 the name of any other entity in the same declarative region.
1545 A namespace-name defined at global scope shall not be
1546 declared as the name of any other entity in any global scope
1548 error ("declaration of namespace %qD conflicts with", newdecl);
1549 error ("previous declaration of namespace %q+D here", olddecl);
1550 return error_mark_node;
1554 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1557 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1558 if (DECL_NAME (olddecl) != NULL_TREE)
1559 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1560 ? G_("%q+#D previously defined here")
1561 : G_("%q+#D previously declared here"), olddecl);
1562 return error_mark_node;
1564 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1565 && DECL_INITIAL (olddecl) != NULL_TREE
1566 && !prototype_p (TREE_TYPE (olddecl))
1567 && prototype_p (TREE_TYPE (newdecl)))
1569 /* Prototype decl follows defn w/o prototype. */
1570 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1571 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1572 "follows non-prototype definition here");
1574 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1575 || TREE_CODE (olddecl) == VAR_DECL)
1576 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1579 If two declarations of the same function or object
1580 specify different linkage-specifications ..., the program
1581 is ill-formed.... Except for functions with C++ linkage,
1582 a function declaration without a linkage specification
1583 shall not precede the first linkage specification for
1584 that function. A function can be declared without a
1585 linkage specification after an explicit linkage
1586 specification has been seen; the linkage explicitly
1587 specified in the earlier declaration is not affected by
1588 such a function declaration.
1590 DR 563 raises the question why the restrictions on
1591 functions should not also apply to objects. Older
1592 versions of G++ silently ignore the linkage-specification
1600 which is clearly wrong. Therefore, we now treat objects
1602 if (current_lang_depth () == 0)
1604 /* There is no explicit linkage-specification, so we use
1605 the linkage from the previous declaration. */
1606 if (!DECL_LANG_SPECIFIC (newdecl))
1607 retrofit_lang_decl (newdecl);
1608 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1612 error ("previous declaration of %q+#D with %qL linkage",
1613 olddecl, DECL_LANGUAGE (olddecl));
1614 error ("conflicts with new declaration with %qL linkage",
1615 DECL_LANGUAGE (newdecl));
1619 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1621 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1623 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1624 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1627 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1630 for (; t1 && t1 != void_list_node;
1631 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1632 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1634 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1637 permerror (input_location, "default argument given for parameter %d of %q#D",
1639 permerror (input_location, "after previous specification in %q+#D", olddecl);
1643 error ("default argument given for parameter %d of %q#D",
1645 error ("after previous specification in %q+#D",
1652 /* Do not merge an implicit typedef with an explicit one. In:
1656 typedef class A A __attribute__ ((foo));
1658 the attribute should apply only to the typedef. */
1659 if (TREE_CODE (olddecl) == TYPE_DECL
1660 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1661 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1664 /* If new decl is `static' and an `extern' was seen previously,
1666 warn_extern_redeclared_static (newdecl, olddecl);
1668 if (!validate_constexpr_redeclaration (olddecl, newdecl))
1669 return error_mark_node;
1671 /* We have committed to returning 1 at this point. */
1672 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1674 /* Now that functions must hold information normally held
1675 by field decls, there is extra work to do so that
1676 declaration information does not get destroyed during
1678 if (DECL_VINDEX (olddecl))
1679 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1680 if (DECL_CONTEXT (olddecl))
1681 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1682 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1683 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1684 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1685 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1686 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1687 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1688 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1689 SET_OVERLOADED_OPERATOR_CODE
1690 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1691 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1693 /* Optionally warn about more than one declaration for the same
1694 name, but don't warn about a function declaration followed by a
1696 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1697 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1698 /* Don't warn about extern decl followed by definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1700 /* Don't warn about friends, let add_friend take care of it. */
1701 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1703 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1704 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1707 if (DECL_DELETED_FN (newdecl))
1709 error ("deleted definition of %qD", newdecl);
1710 error ("after previous declaration %q+D", olddecl);
1712 DECL_DELETED_FN (newdecl) |= DECL_DELETED_FN (olddecl);
1715 /* Deal with C++: must preserve virtual function table size. */
1716 if (TREE_CODE (olddecl) == TYPE_DECL)
1718 tree newtype = TREE_TYPE (newdecl);
1719 tree oldtype = TREE_TYPE (olddecl);
1721 if (newtype != error_mark_node && oldtype != error_mark_node
1722 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1723 CLASSTYPE_FRIEND_CLASSES (newtype)
1724 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1726 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1729 /* Copy all the DECL_... slots specified in the new decl
1730 except for any that we copy here from the old type. */
1731 DECL_ATTRIBUTES (newdecl)
1732 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1734 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1738 old_result = DECL_TEMPLATE_RESULT (olddecl);
1739 new_result = DECL_TEMPLATE_RESULT (newdecl);
1740 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1741 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1742 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1743 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1745 DECL_ATTRIBUTES (old_result)
1746 = (*targetm.merge_decl_attributes) (old_result, new_result);
1748 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1750 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1751 && DECL_INITIAL (new_result))
1753 if (DECL_INITIAL (old_result))
1754 DECL_UNINLINABLE (old_result) = 1;
1756 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1757 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1758 DECL_NOT_REALLY_EXTERN (old_result)
1759 = DECL_NOT_REALLY_EXTERN (new_result);
1760 DECL_INTERFACE_KNOWN (old_result)
1761 = DECL_INTERFACE_KNOWN (new_result);
1762 DECL_DECLARED_INLINE_P (old_result)
1763 = DECL_DECLARED_INLINE_P (new_result);
1764 DECL_DISREGARD_INLINE_LIMITS (old_result)
1765 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1770 DECL_DECLARED_INLINE_P (old_result)
1771 |= DECL_DECLARED_INLINE_P (new_result);
1772 DECL_DISREGARD_INLINE_LIMITS (old_result)
1773 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1774 check_redeclaration_exception_specification (newdecl, olddecl);
1778 /* If the new declaration is a definition, update the file and
1779 line information on the declaration, and also make
1780 the old declaration the same definition. */
1781 if (DECL_INITIAL (new_result) != NULL_TREE)
1783 DECL_SOURCE_LOCATION (olddecl)
1784 = DECL_SOURCE_LOCATION (old_result)
1785 = DECL_SOURCE_LOCATION (newdecl);
1786 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1787 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1790 DECL_ARGUMENTS (old_result)
1791 = DECL_ARGUMENTS (new_result);
1792 for (parm = DECL_ARGUMENTS (old_result); parm;
1793 parm = DECL_CHAIN (parm))
1794 DECL_CONTEXT (parm) = old_result;
1803 /* Automatically handles default parameters. */
1804 tree oldtype = TREE_TYPE (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 maybe_instantiate_noexcept (olddecl);
1810 /* Merge the data types specified in the two decls. */
1811 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1813 /* If merge_types produces a non-typedef type, just use the old type. */
1814 if (TREE_CODE (newdecl) == TYPE_DECL
1815 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1818 if (TREE_CODE (newdecl) == VAR_DECL)
1820 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1821 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1822 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1823 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1824 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1825 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1827 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1828 if (DECL_LANG_SPECIFIC (olddecl)
1829 && CP_DECL_THREADPRIVATE_P (olddecl))
1831 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1832 if (!DECL_LANG_SPECIFIC (newdecl))
1833 retrofit_lang_decl (newdecl);
1835 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1836 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1840 /* Do this after calling `merge_types' so that default
1841 parameters don't confuse us. */
1842 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 check_redeclaration_exception_specification (newdecl, olddecl);
1844 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 check_default_args (newdecl);
1849 /* Lay the type out, unless already done. */
1850 if (! same_type_p (newtype, oldtype)
1851 && TREE_TYPE (newdecl) != error_mark_node
1852 && !(processing_template_decl && uses_template_parms (newdecl)))
1853 layout_type (TREE_TYPE (newdecl));
1855 if ((TREE_CODE (newdecl) == VAR_DECL
1856 || TREE_CODE (newdecl) == PARM_DECL
1857 || TREE_CODE (newdecl) == RESULT_DECL
1858 || TREE_CODE (newdecl) == FIELD_DECL
1859 || TREE_CODE (newdecl) == TYPE_DECL)
1860 && !(processing_template_decl && uses_template_parms (newdecl)))
1861 layout_decl (newdecl, 0);
1863 /* Merge the type qualifiers. */
1864 if (TREE_READONLY (newdecl))
1865 TREE_READONLY (olddecl) = 1;
1866 if (TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (olddecl) = 1;
1868 if (TREE_NOTHROW (newdecl))
1869 TREE_NOTHROW (olddecl) = 1;
1871 /* Merge deprecatedness. */
1872 if (TREE_DEPRECATED (newdecl))
1873 TREE_DEPRECATED (olddecl) = 1;
1875 /* Preserve function specific target and optimization options */
1876 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1878 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1879 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1880 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1881 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1883 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1884 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1885 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1886 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1889 /* Merge the initialization information. */
1890 if (DECL_INITIAL (newdecl) == NULL_TREE
1891 && DECL_INITIAL (olddecl) != NULL_TREE)
1893 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1895 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1897 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1898 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1902 /* Merge the section attribute.
1903 We want to issue an error if the sections conflict but that must be
1904 done later in decl_attributes since we are called before attributes
1906 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1907 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1912 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1913 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1914 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1915 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1916 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1917 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1918 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1919 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1920 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1921 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1922 /* Keep the old RTL. */
1923 COPY_DECL_RTL (olddecl, newdecl);
1925 else if (TREE_CODE (newdecl) == VAR_DECL
1926 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1928 /* Keep the old RTL. We cannot keep the old RTL if the old
1929 declaration was for an incomplete object and the new
1930 declaration is not since many attributes of the RTL will
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1939 /* Clean out any memory we had of the old declaration. */
1940 tree oldstatic = value_member (olddecl, static_aggregates);
1942 TREE_VALUE (oldstatic) = error_mark_node;
1944 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1945 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1946 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1947 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1950 /* Merge the storage class information. */
1951 merge_weak (newdecl, olddecl);
1953 if (DECL_ONE_ONLY (olddecl))
1954 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1956 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1957 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1959 if (! DECL_EXTERNAL (olddecl))
1960 DECL_EXTERNAL (newdecl) = 0;
1962 new_template_info = NULL_TREE;
1963 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1965 bool new_redefines_gnu_inline = false;
1967 if (new_defines_function
1968 && ((DECL_INTERFACE_KNOWN (olddecl)
1969 && TREE_CODE (olddecl) == FUNCTION_DECL)
1970 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1971 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1972 == FUNCTION_DECL))))
1976 if (TREE_CODE (fn) == TEMPLATE_DECL)
1977 fn = DECL_TEMPLATE_RESULT (olddecl);
1979 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1982 if (!new_redefines_gnu_inline)
1984 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1985 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1986 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1988 DECL_TEMPLATE_INSTANTIATED (newdecl)
1989 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1990 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1992 /* If the OLDDECL is an instantiation and/or specialization,
1993 then the NEWDECL must be too. But, it may not yet be marked
1994 as such if the caller has created NEWDECL, but has not yet
1995 figured out that it is a redeclaration. */
1996 if (!DECL_USE_TEMPLATE (newdecl))
1997 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1999 /* Don't really know how much of the language-specific
2000 values we should copy from old to new. */
2001 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
2002 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
2003 DECL_INITIALIZED_IN_CLASS_P (newdecl)
2004 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
2006 if (LANG_DECL_HAS_MIN (newdecl))
2008 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
2009 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
2010 if (DECL_TEMPLATE_INFO (newdecl))
2011 new_template_info = DECL_TEMPLATE_INFO (newdecl);
2012 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
2014 /* Only functions have these fields. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL
2016 || DECL_FUNCTION_TEMPLATE_P (newdecl))
2018 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
2019 olddecl_friend = DECL_FRIEND_P (olddecl);
2020 hidden_friend = (DECL_ANTICIPATED (olddecl)
2021 && DECL_HIDDEN_FRIEND_P (olddecl)
2022 && newdecl_is_friend);
2023 DECL_BEFRIENDING_CLASSES (newdecl)
2024 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
2025 DECL_BEFRIENDING_CLASSES (olddecl));
2026 /* DECL_THUNKS is only valid for virtual functions,
2027 otherwise it is a DECL_FRIEND_CONTEXT. */
2028 if (DECL_VIRTUAL_P (newdecl))
2029 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
2031 /* Only variables have this field. */
2032 else if (TREE_CODE (newdecl) == VAR_DECL
2033 && VAR_HAD_UNKNOWN_BOUND (olddecl))
2034 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 /* Merge parameter attributes. */
2042 tree oldarg, newarg;
2043 for (oldarg = DECL_ARGUMENTS(olddecl),
2044 newarg = DECL_ARGUMENTS(newdecl);
2046 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
2047 DECL_ATTRIBUTES (newarg)
2048 = (*targetm.merge_decl_attributes) (oldarg, newarg);
2049 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
2052 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
2053 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
2055 /* If newdecl is not a specialization, then it is not a
2056 template-related function at all. And that means that we
2057 should have exited above, returning 0. */
2058 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
2060 if (DECL_ODR_USED (olddecl))
2061 /* From [temp.expl.spec]:
2063 If a template, a member template or the member of a class
2064 template is explicitly specialized then that
2065 specialization shall be declared before the first use of
2066 that specialization that would cause an implicit
2067 instantiation to take place, in every translation unit in
2068 which such a use occurs. */
2069 error ("explicit specialization of %qD after first use",
2072 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2074 /* Don't propagate visibility from the template to the
2075 specialization here. We'll do that in determine_visibility if
2077 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2079 /* [temp.expl.spec/14] We don't inline explicit specialization
2080 just because the primary template says so. */
2082 /* But still keep DECL_DISREGARD_INLINE_LIMITS in sync with
2083 the always_inline attribute. */
2084 if (DECL_DISREGARD_INLINE_LIMITS (olddecl)
2085 && !DECL_DISREGARD_INLINE_LIMITS (newdecl))
2087 if (DECL_DECLARED_INLINE_P (newdecl))
2088 DECL_DISREGARD_INLINE_LIMITS (newdecl) = true;
2090 DECL_ATTRIBUTES (newdecl)
2091 = remove_attribute ("always_inline",
2092 DECL_ATTRIBUTES (newdecl));
2095 else if (new_defines_function && DECL_INITIAL (olddecl))
2097 /* Never inline re-defined extern inline functions.
2098 FIXME: this could be better handled by keeping both
2099 function as separate declarations. */
2100 DECL_UNINLINABLE (newdecl) = 1;
2104 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2105 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2107 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2109 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2110 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2112 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2113 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2114 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2115 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2118 /* Preserve abstractness on cloned [cd]tors. */
2119 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2121 /* Update newdecl's parms to point at olddecl. */
2122 for (parm = DECL_ARGUMENTS (newdecl); parm;
2123 parm = DECL_CHAIN (parm))
2124 DECL_CONTEXT (parm) = olddecl;
2128 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2129 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2130 COPY_DECL_RTL (newdecl, olddecl);
2132 if (! types_match || new_defines_function)
2134 /* These need to be copied so that the names are available.
2135 Note that if the types do match, we'll preserve inline
2136 info and other bits, but if not, we won't. */
2137 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2138 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2140 if (new_defines_function)
2141 /* If defining a function declared with other language
2142 linkage, use the previously declared language linkage. */
2143 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2144 else if (types_match)
2146 /* If redeclaring a builtin function, and not a definition,
2147 it stays built in. */
2148 if (DECL_BUILT_IN (olddecl))
2150 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2151 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2152 /* If we're keeping the built-in definition, keep the rtl,
2153 regardless of declaration matches. */
2154 COPY_DECL_RTL (olddecl, newdecl);
2155 if (DECL_BUILT_IN_CLASS (newdecl) == BUILT_IN_NORMAL)
2157 enum built_in_function fncode = DECL_FUNCTION_CODE (newdecl);
2160 /* If a compatible prototype of these builtin functions
2161 is seen, assume the runtime implements it with the
2162 expected semantics. */
2163 case BUILT_IN_STPCPY:
2164 if (builtin_decl_explicit_p (fncode))
2165 set_builtin_decl_implicit_p (fncode, true);
2173 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2174 /* Don't clear out the arguments if we're just redeclaring a
2176 if (DECL_ARGUMENTS (olddecl))
2177 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2180 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2181 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2183 /* Now preserve various other info from the definition. */
2184 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2185 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2186 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2187 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2189 /* Warn about conflicting visibility specifications. */
2190 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2191 && DECL_VISIBILITY_SPECIFIED (newdecl)
2192 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2194 warning_at (input_location, OPT_Wattributes,
2195 "%q+D: visibility attribute ignored because it", newdecl);
2196 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2197 "conflicts with previous declaration here");
2199 /* Choose the declaration which specified visibility. */
2200 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2202 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2203 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2205 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2206 so keep this behavior. */
2207 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2209 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2210 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2212 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2213 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2214 if (TREE_CODE (newdecl) == FIELD_DECL)
2215 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2217 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2218 with that from NEWDECL below. */
2219 if (DECL_LANG_SPECIFIC (olddecl))
2221 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2222 != DECL_LANG_SPECIFIC (newdecl));
2223 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2226 /* Merge the USED information. */
2227 if (TREE_USED (olddecl))
2228 TREE_USED (newdecl) = 1;
2229 else if (TREE_USED (newdecl))
2230 TREE_USED (olddecl) = 1;
2231 if (TREE_CODE (newdecl) == VAR_DECL)
2233 if (DECL_READ_P (olddecl))
2234 DECL_READ_P (newdecl) = 1;
2235 else if (DECL_READ_P (newdecl))
2236 DECL_READ_P (olddecl) = 1;
2238 if (DECL_PRESERVE_P (olddecl))
2239 DECL_PRESERVE_P (newdecl) = 1;
2240 else if (DECL_PRESERVE_P (newdecl))
2241 DECL_PRESERVE_P (olddecl) = 1;
2243 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 function_size = sizeof (struct tree_decl_common);
2249 memcpy ((char *) olddecl + sizeof (struct tree_common),
2250 (char *) newdecl + sizeof (struct tree_common),
2251 function_size - sizeof (struct tree_common));
2253 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2254 (char *) newdecl + sizeof (struct tree_decl_common),
2255 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2256 if (new_template_info)
2257 /* If newdecl is a template instantiation, it is possible that
2258 the following sequence of events has occurred:
2260 o A friend function was declared in a class template. The
2261 class template was instantiated.
2263 o The instantiation of the friend declaration was
2264 recorded on the instantiation list, and is newdecl.
2266 o Later, however, instantiate_class_template called pushdecl
2267 on the newdecl to perform name injection. But, pushdecl in
2268 turn called duplicate_decls when it discovered that another
2269 declaration of a global function with the same name already
2272 o Here, in duplicate_decls, we decided to clobber newdecl.
2274 If we're going to do that, we'd better make sure that
2275 olddecl, and not newdecl, is on the list of
2276 instantiations so that if we try to do the instantiation
2277 again we won't get the clobbered declaration. */
2278 reregister_specialization (newdecl,
2284 size_t size = tree_code_size (TREE_CODE (olddecl));
2285 memcpy ((char *) olddecl + sizeof (struct tree_common),
2286 (char *) newdecl + sizeof (struct tree_common),
2287 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2288 switch (TREE_CODE (olddecl))
2298 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2299 (char *) newdecl + sizeof (struct tree_decl_common),
2300 size - sizeof (struct tree_decl_common)
2301 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2305 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2306 (char *) newdecl + sizeof (struct tree_decl_common),
2307 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2308 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2312 DECL_UID (olddecl) = olddecl_uid;
2314 DECL_FRIEND_P (olddecl) = 1;
2317 DECL_ANTICIPATED (olddecl) = 1;
2318 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2321 /* NEWDECL contains the merged attribute lists.
2322 Update OLDDECL to be the same. */
2323 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2325 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2326 so that encode_section_info has a chance to look at the new decl
2327 flags and attributes. */
2328 if (DECL_RTL_SET_P (olddecl)
2329 && (TREE_CODE (olddecl) == FUNCTION_DECL
2330 || (TREE_CODE (olddecl) == VAR_DECL
2331 && TREE_STATIC (olddecl))))
2332 make_decl_rtl (olddecl);
2334 /* The NEWDECL will no longer be needed. Because every out-of-class
2335 declaration of a member results in a call to duplicate_decls,
2336 freeing these nodes represents in a significant savings. */
2342 /* Return zero if the declaration NEWDECL is valid
2343 when the declaration OLDDECL (assumed to be for the same name)
2344 has already been seen.
2345 Otherwise return an error message format string with a %s
2346 where the identifier should go. */
2349 redeclaration_error_message (tree newdecl, tree olddecl)
2351 if (TREE_CODE (newdecl) == TYPE_DECL)
2353 /* Because C++ can put things into name space for free,
2354 constructs like "typedef struct foo { ... } foo"
2355 would look like an erroneous redeclaration. */
2356 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2359 return G_("redefinition of %q#D");
2361 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2363 /* If this is a pure function, its olddecl will actually be
2364 the original initialization to `0' (which we force to call
2365 abort()). Don't complain about redefinition in this case. */
2366 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2367 && DECL_INITIAL (olddecl) == NULL_TREE)
2370 /* If both functions come from different namespaces, this is not
2371 a redeclaration - this is a conflict with a used function. */
2372 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2373 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2374 && ! decls_match (olddecl, newdecl))
2375 return G_("%qD conflicts with used function");
2377 /* We'll complain about linkage mismatches in
2378 warn_extern_redeclared_static. */
2380 /* Defining the same name twice is no good. */
2381 if (DECL_INITIAL (olddecl) != NULL_TREE
2382 && DECL_INITIAL (newdecl) != NULL_TREE)
2384 if (DECL_NAME (olddecl) == NULL_TREE)
2385 return G_("%q#D not declared in class");
2386 else if (!GNU_INLINE_P (olddecl)
2387 || GNU_INLINE_P (newdecl))
2388 return G_("redefinition of %q#D");
2391 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2393 bool olda = GNU_INLINE_P (olddecl);
2394 bool newa = GNU_INLINE_P (newdecl);
2399 return G_("%q+D redeclared inline with "
2400 "%<gnu_inline%> attribute");
2402 return G_("%q+D redeclared inline without "
2403 "%<gnu_inline%> attribute");
2409 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2413 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2415 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2416 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2417 return G_("redefinition of %q#D");
2421 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2422 || (DECL_TEMPLATE_RESULT (newdecl)
2423 == DECL_TEMPLATE_RESULT (olddecl)))
2426 nt = DECL_TEMPLATE_RESULT (newdecl);
2427 if (DECL_TEMPLATE_INFO (nt))
2428 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2429 ot = DECL_TEMPLATE_RESULT (olddecl);
2430 if (DECL_TEMPLATE_INFO (ot))
2431 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2432 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2433 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2434 return G_("redefinition of %q#D");
2436 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2438 bool olda = GNU_INLINE_P (ot);
2439 bool newa = GNU_INLINE_P (nt);
2444 return G_("%q+D redeclared inline with "
2445 "%<gnu_inline%> attribute");
2447 return G_("%q+D redeclared inline without "
2448 "%<gnu_inline%> attribute");
2452 /* Core issue #226 (C++0x):
2454 If a friend function template declaration specifies a
2455 default template-argument, that declaration shall be a
2456 definition and shall be the only declaration of the
2457 function template in the translation unit. */
2458 if ((cxx_dialect != cxx98)
2459 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2460 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2461 /*is_primary=*/1, /*is_partial=*/0,
2462 /*is_friend_decl=*/2))
2463 return G_("redeclaration of friend %q#D "
2464 "may not have default template arguments");
2468 else if (TREE_CODE (newdecl) == VAR_DECL
2469 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2470 && (! DECL_LANG_SPECIFIC (olddecl)
2471 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2472 || DECL_THREAD_LOCAL_P (newdecl)))
2474 /* Only variables can be thread-local, and all declarations must
2475 agree on this property. */
2476 if (DECL_THREAD_LOCAL_P (newdecl))
2477 return G_("thread-local declaration of %q#D follows "
2478 "non-thread-local declaration");
2480 return G_("non-thread-local declaration of %q#D follows "
2481 "thread-local declaration");
2483 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2485 /* The objects have been declared at namespace scope. If either
2486 is a member of an anonymous union, then this is an invalid
2487 redeclaration. For example:
2493 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2494 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2495 return G_("redeclaration of %q#D");
2496 /* If at least one declaration is a reference, there is no
2497 conflict. For example:
2503 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2505 /* Reject two definitions. */
2506 return G_("redefinition of %q#D");
2510 /* Objects declared with block scope: */
2511 /* Reject two definitions, and reject a definition
2512 together with an external reference. */
2513 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2514 return G_("redeclaration of %q#D");
2519 /* Hash and equality functions for the named_label table. */
2522 named_label_entry_hash (const void *data)
2524 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2525 return DECL_UID (ent->label_decl);
2529 named_label_entry_eq (const void *a, const void *b)
2531 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2532 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2533 return ent_a->label_decl == ent_b->label_decl;
2536 /* Create a new label, named ID. */
2539 make_label_decl (tree id, int local_p)
2541 struct named_label_entry *ent;
2545 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2547 DECL_CONTEXT (decl) = current_function_decl;
2548 DECL_MODE (decl) = VOIDmode;
2549 C_DECLARED_LABEL_FLAG (decl) = local_p;
2551 /* Say where one reference is to the label, for the sake of the
2552 error if it is not defined. */
2553 DECL_SOURCE_LOCATION (decl) = input_location;
2555 /* Record the fact that this identifier is bound to this label. */
2556 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2558 /* Create the label htab for the function on demand. */
2560 named_labels = htab_create_ggc (13, named_label_entry_hash,
2561 named_label_entry_eq, NULL);
2563 /* Record this label on the list of labels used in this function.
2564 We do this before calling make_label_decl so that we get the
2565 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2566 ent = ggc_alloc_cleared_named_label_entry ();
2567 ent->label_decl = decl;
2569 slot = htab_find_slot (named_labels, ent, INSERT);
2570 gcc_assert (*slot == NULL);
2576 /* Look for a label named ID in the current function. If one cannot
2577 be found, create one. (We keep track of used, but undefined,
2578 labels, and complain about them at the end of a function.) */
2581 lookup_label_1 (tree id)
2585 /* You can't use labels at global scope. */
2586 if (current_function_decl == NULL_TREE)
2588 error ("label %qE referenced outside of any function", id);
2592 /* See if we've already got this label. */
2593 decl = IDENTIFIER_LABEL_VALUE (id);
2594 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2597 decl = make_label_decl (id, /*local_p=*/0);
2601 /* Wrapper for lookup_label_1. */
2604 lookup_label (tree id)
2607 bool subtime = timevar_cond_start (TV_NAME_LOOKUP);
2608 ret = lookup_label_1 (id);
2609 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
2613 /* Declare a local label named ID. */
2616 declare_local_label (tree id)
2619 cp_label_binding *bind;
2621 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2622 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2623 bind = VEC_safe_push (cp_label_binding, gc,
2624 current_binding_level->shadowed_labels, NULL);
2625 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2627 decl = make_label_decl (id, /*local_p=*/1);
2633 /* Returns nonzero if it is ill-formed to jump past the declaration of
2634 DECL. Returns 2 if it's also a real problem. */
2637 decl_jump_unsafe (tree decl)
2639 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2640 with automatic storage duration is not in scope to a point where it is
2641 in scope is ill-formed unless the variable has scalar type, class type
2642 with a trivial default constructor and a trivial destructor, a
2643 cv-qualified version of one of these types, or an array of one of the
2644 preceding types and is declared without an initializer (8.5). */
2645 tree type = TREE_TYPE (decl);
2647 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2648 || type == error_mark_node)
2651 type = strip_array_types (type);
2653 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2654 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2657 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2663 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2666 identify_goto (tree decl, const location_t *locus)
2669 permerror (input_location, "jump to label %qD", decl);
2671 permerror (input_location, "jump to case label");
2673 permerror (*locus, " from here");
2676 /* Check that a single previously seen jump to a newly defined label
2677 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2678 the jump context; NAMES are the names in scope in LEVEL at the jump
2679 context; LOCUS is the source position of the jump or 0. Returns
2680 true if all is well. */
2683 check_previous_goto_1 (tree decl, cp_binding_level* level, tree names,
2684 bool exited_omp, const location_t *locus)
2686 cp_binding_level *b;
2687 bool identified = false, saw_eh = false, saw_omp = false;
2691 identify_goto (decl, locus);
2692 error (" exits OpenMP structured block");
2693 identified = saw_omp = true;
2696 for (b = current_binding_level; b ; b = b->level_chain)
2698 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2700 for (new_decls = b->names; new_decls != old_decls;
2701 new_decls = (DECL_P (new_decls) ? DECL_CHAIN (new_decls)
2702 : TREE_CHAIN (new_decls)))
2704 int problem = decl_jump_unsafe (new_decls);
2710 identify_goto (decl, locus);
2714 error (" crosses initialization of %q+#D", new_decls);
2716 permerror (input_location, " enters scope of %q+#D which has "
2717 "non-trivial destructor", new_decls);
2722 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2726 identify_goto (decl, locus);
2729 if (b->kind == sk_try)
2730 error (" enters try block");
2732 error (" enters catch block");
2735 if (b->kind == sk_omp && !saw_omp)
2739 identify_goto (decl, locus);
2742 error (" enters OpenMP structured block");
2751 check_previous_goto (tree decl, struct named_label_use_entry *use)
2753 check_previous_goto_1 (decl, use->binding_level,
2754 use->names_in_scope, use->in_omp_scope,
2755 &use->o_goto_locus);
2759 check_switch_goto (cp_binding_level* level)
2761 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2764 /* Check that a new jump to a label DECL is OK. Called by
2765 finish_goto_stmt. */
2768 check_goto (tree decl)
2770 struct named_label_entry *ent, dummy;
2771 bool saw_catch = false, identified = false;
2775 /* We can't know where a computed goto is jumping.
2776 So we assume that it's OK. */
2777 if (TREE_CODE (decl) != LABEL_DECL)
2780 /* We didn't record any information about this label when we created it,
2781 and there's not much point since it's trivial to analyze as a return. */
2782 if (decl == cdtor_label)
2785 dummy.label_decl = decl;
2786 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2787 gcc_assert (ent != NULL);
2789 /* If the label hasn't been defined yet, defer checking. */
2790 if (! DECL_INITIAL (decl))
2792 struct named_label_use_entry *new_use;
2794 /* Don't bother creating another use if the last goto had the
2795 same data, and will therefore create the same set of errors. */
2797 && ent->uses->names_in_scope == current_binding_level->names)
2800 new_use = ggc_alloc_named_label_use_entry ();
2801 new_use->binding_level = current_binding_level;
2802 new_use->names_in_scope = current_binding_level->names;
2803 new_use->o_goto_locus = input_location;
2804 new_use->in_omp_scope = false;
2806 new_use->next = ent->uses;
2807 ent->uses = new_use;
2811 if (ent->in_try_scope || ent->in_catch_scope
2812 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2814 permerror (input_location, "jump to label %q+D", decl);
2815 permerror (input_location, " from here");
2819 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2821 int u = decl_jump_unsafe (bad);
2823 if (u > 1 && DECL_ARTIFICIAL (bad))
2825 /* Can't skip init of __exception_info. */
2826 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2830 error (" skips initialization of %q+#D", bad);
2832 permerror (input_location, " enters scope of %q+#D which has "
2833 "non-trivial destructor", bad);
2836 if (ent->in_try_scope)
2837 error (" enters try block");
2838 else if (ent->in_catch_scope && !saw_catch)
2839 error (" enters catch block");
2841 if (ent->in_omp_scope)
2842 error (" enters OpenMP structured block");
2843 else if (flag_openmp)
2845 cp_binding_level *b;
2846 for (b = current_binding_level; b ; b = b->level_chain)
2848 if (b == ent->binding_level)
2850 if (b->kind == sk_omp)
2854 permerror (input_location, "jump to label %q+D", decl);
2855 permerror (input_location, " from here");
2858 error (" exits OpenMP structured block");
2865 /* Check that a return is ok wrt OpenMP structured blocks.
2866 Called by finish_return_stmt. Returns true if all is well. */
2869 check_omp_return (void)
2871 cp_binding_level *b;
2872 for (b = current_binding_level; b ; b = b->level_chain)
2873 if (b->kind == sk_omp)
2875 error ("invalid exit from OpenMP structured block");
2878 else if (b->kind == sk_function_parms)
2883 /* Define a label, specifying the location in the source file.
2884 Return the LABEL_DECL node for the label. */
2887 define_label_1 (location_t location, tree name)
2889 struct named_label_entry *ent, dummy;
2890 cp_binding_level *p;
2893 decl = lookup_label (name);
2895 dummy.label_decl = decl;
2896 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2897 gcc_assert (ent != NULL);
2899 /* After labels, make any new cleanups in the function go into their
2900 own new (temporary) binding contour. */
2901 for (p = current_binding_level;
2902 p->kind != sk_function_parms;
2904 p->more_cleanups_ok = 0;
2906 if (name == get_identifier ("wchar_t"))
2907 permerror (input_location, "label named wchar_t");
2909 if (DECL_INITIAL (decl) != NULL_TREE)
2911 error ("duplicate label %qD", decl);
2912 return error_mark_node;
2916 struct named_label_use_entry *use;
2918 /* Mark label as having been defined. */
2919 DECL_INITIAL (decl) = error_mark_node;
2920 /* Say where in the source. */
2921 DECL_SOURCE_LOCATION (decl) = location;
2923 ent->binding_level = current_binding_level;
2924 ent->names_in_scope = current_binding_level->names;
2926 for (use = ent->uses; use ; use = use->next)
2927 check_previous_goto (decl, use);
2934 /* Wrapper for define_label_1. */
2937 define_label (location_t location, tree name)
2940 timevar_start (TV_NAME_LOOKUP);
2941 ret = define_label_1 (location, name);
2942 timevar_stop (TV_NAME_LOOKUP);
2949 cp_binding_level *level;
2950 struct cp_switch *next;
2951 /* The SWITCH_STMT being built. */
2953 /* A splay-tree mapping the low element of a case range to the high
2954 element, or NULL_TREE if there is no high element. Used to
2955 determine whether or not a new case label duplicates an old case
2956 label. We need a tree, rather than simply a hash table, because
2957 of the GNU case range extension. */
2961 /* A stack of the currently active switch statements. The innermost
2962 switch statement is on the top of the stack. There is no need to
2963 mark the stack for garbage collection because it is only active
2964 during the processing of the body of a function, and we never
2965 collect at that point. */
2967 static struct cp_switch *switch_stack;
2969 /* Called right after a switch-statement condition is parsed.
2970 SWITCH_STMT is the switch statement being parsed. */
2973 push_switch (tree switch_stmt)
2975 struct cp_switch *p = XNEW (struct cp_switch);
2976 p->level = current_binding_level;
2977 p->next = switch_stack;
2978 p->switch_stmt = switch_stmt;
2979 p->cases = splay_tree_new (case_compare, NULL, NULL);
2986 struct cp_switch *cs = switch_stack;
2987 location_t switch_location;
2989 /* Emit warnings as needed. */
2990 switch_location = EXPR_LOC_OR_HERE (cs->switch_stmt);
2991 if (!processing_template_decl)
2992 c_do_switch_warnings (cs->cases, switch_location,
2993 SWITCH_STMT_TYPE (cs->switch_stmt),
2994 SWITCH_STMT_COND (cs->switch_stmt));
2996 splay_tree_delete (cs->cases);
2997 switch_stack = switch_stack->next;
3001 /* Convert a case constant VALUE in a switch to the type TYPE of the switch
3002 condition. Note that if TYPE and VALUE are already integral we don't
3003 really do the conversion because the language-independent
3004 warning/optimization code will work better that way. */
3007 case_conversion (tree type, tree value)
3009 if (value == NULL_TREE)
3012 if (cxx_dialect >= cxx0x
3013 && (SCOPED_ENUM_P (type)
3014 || !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value))))
3016 if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
3017 type = type_promotes_to (type);
3018 value = perform_implicit_conversion (type, value, tf_warning_or_error);
3020 return cxx_constant_value (value);
3023 /* Note that we've seen a definition of a case label, and complain if this
3024 is a bad place for one. */
3027 finish_case_label (location_t loc, tree low_value, tree high_value)
3030 cp_binding_level *p;
3033 if (processing_template_decl)
3037 /* For templates, just add the case label; we'll do semantic
3038 analysis at instantiation-time. */
3039 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
3040 return add_stmt (build_case_label (low_value, high_value, label));
3043 /* Find the condition on which this switch statement depends. */
3044 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
3045 if (cond && TREE_CODE (cond) == TREE_LIST)
3046 cond = TREE_VALUE (cond);
3048 if (!check_switch_goto (switch_stack->level))
3049 return error_mark_node;
3051 type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
3053 low_value = case_conversion (type, low_value);
3054 high_value = case_conversion (type, high_value);
3056 r = c_add_case_label (loc, switch_stack->cases, cond, type,
3057 low_value, high_value);
3059 /* After labels, make any new cleanups in the function go into their
3060 own new (temporary) binding contour. */
3061 for (p = current_binding_level;
3062 p->kind != sk_function_parms;
3064 p->more_cleanups_ok = 0;
3069 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
3072 typename_hash (const void* k)
3075 const_tree const t = (const_tree) k;
3077 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
3078 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
3083 typedef struct typename_info {
3091 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
3092 really of type `typename_info*' */
3095 typename_compare (const void * k1, const void * k2)
3097 const_tree const t1 = (const_tree) k1;
3098 const typename_info *const t2 = (const typename_info *) k2;
3100 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
3101 && TYPE_CONTEXT (t1) == t2->scope
3102 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
3103 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
3104 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
3107 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
3108 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
3110 Returns the new TYPENAME_TYPE. */
3112 static GTY ((param_is (union tree_node))) htab_t typename_htab;
3115 build_typename_type (tree context, tree name, tree fullname,
3116 enum tag_types tag_type)
3124 if (typename_htab == NULL)
3125 typename_htab = htab_create_ggc (61, &typename_hash,
3126 &typename_compare, NULL);
3128 ti.scope = FROB_CONTEXT (context);
3130 ti.template_id = fullname;
3131 ti.enum_p = tag_type == enum_type;
3132 ti.class_p = (tag_type == class_type
3133 || tag_type == record_type
3134 || tag_type == union_type);
3135 hash = (htab_hash_pointer (ti.scope)
3136 ^ htab_hash_pointer (ti.name));
3138 /* See if we already have this type. */
3139 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3144 /* Build the TYPENAME_TYPE. */
3145 t = cxx_make_type (TYPENAME_TYPE);
3146 TYPE_CONTEXT (t) = ti.scope;
3147 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3148 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3149 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3151 /* Build the corresponding TYPE_DECL. */
3152 d = build_decl (input_location, TYPE_DECL, name, t);
3153 TYPE_NAME (TREE_TYPE (d)) = d;
3154 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3155 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3156 DECL_ARTIFICIAL (d) = 1;
3158 /* Store it in the hash table. */
3161 /* TYPENAME_TYPEs must always be compared structurally, because
3162 they may or may not resolve down to another type depending on
3163 the currently open classes. */
3164 SET_TYPE_STRUCTURAL_EQUALITY (t);
3170 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3171 provided to name the type. Returns an appropriate type, unless an
3172 error occurs, in which case error_mark_node is returned. If we
3173 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3174 return that, rather than the _TYPE it corresponds to, in other
3175 cases we look through the type decl. If TF_ERROR is set, complain
3176 about errors, otherwise be quiet. */
3179 make_typename_type (tree context, tree name, enum tag_types tag_type,
3180 tsubst_flags_t complain)
3186 if (name == error_mark_node
3187 || context == NULL_TREE
3188 || context == error_mark_node)
3189 return error_mark_node;
3193 if (!(TYPE_LANG_SPECIFIC (name)
3194 && (CLASSTYPE_IS_TEMPLATE (name)
3195 || CLASSTYPE_USE_TEMPLATE (name))))
3196 name = TYPE_IDENTIFIER (name);
3198 /* Create a TEMPLATE_ID_EXPR for the type. */
3199 name = build_nt (TEMPLATE_ID_EXPR,
3200 CLASSTYPE_TI_TEMPLATE (name),
3201 CLASSTYPE_TI_ARGS (name));
3203 else if (TREE_CODE (name) == TYPE_DECL)
3204 name = DECL_NAME (name);
3208 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3210 name = TREE_OPERAND (name, 0);
3211 if (TREE_CODE (name) == TEMPLATE_DECL)
3212 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3213 else if (TREE_CODE (name) == OVERLOAD)
3215 error ("%qD is not a type", name);
3216 return error_mark_node;
3219 if (TREE_CODE (name) == TEMPLATE_DECL)
3221 error ("%qD used without template parameters", name);
3222 return error_mark_node;
3224 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3225 gcc_assert (TYPE_P (context));
3227 if (!MAYBE_CLASS_TYPE_P (context))
3229 if (complain & tf_error)
3230 error ("%q#T is not a class", context);
3231 return error_mark_node;
3234 /* When the CONTEXT is a dependent type, NAME could refer to a
3235 dependent base class of CONTEXT. But look inside it anyway
3236 if CONTEXT is a currently open scope, in case it refers to a
3237 member of the current instantiation or a non-dependent base;
3238 lookup will stop when we hit a dependent base. */
3239 if (!dependent_scope_p (context))
3240 /* We should only set WANT_TYPE when we're a nested typename type.
3241 Then we can give better diagnostics if we find a non-type. */
3242 t = lookup_field (context, name, 2, /*want_type=*/true);
3246 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3247 return build_typename_type (context, name, fullname, tag_type);
3249 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3253 if (complain & tf_error)
3254 error (want_template ? G_("no class template named %q#T in %q#T")
3255 : G_("no type named %q#T in %q#T"), name, context);
3256 return error_mark_node;
3259 /* Pull out the template from an injected-class-name (or multiple). */
3261 t = maybe_get_template_decl_from_type_decl (t);
3263 if (TREE_CODE (t) == TREE_LIST)
3265 if (complain & tf_error)
3267 error ("lookup of %qT in %qT is ambiguous", name, context);
3268 print_candidates (t);
3270 return error_mark_node;
3273 if (want_template && !DECL_TYPE_TEMPLATE_P (t))
3275 if (complain & tf_error)
3276 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3278 return error_mark_node;
3280 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3282 if (complain & tf_error)
3283 error ("%<typename %T::%D%> names %q#T, which is not a type",
3285 return error_mark_node;
3288 if (complain & tf_error)
3289 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3291 /* If we are currently parsing a template and if T is a typedef accessed
3292 through CONTEXT then we need to remember and check access of T at
3293 template instantiation time. */
3294 add_typedef_to_current_template_for_access_check (t, context, input_location);
3297 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3299 /*entering_scope=*/0,
3300 tf_warning_or_error | tf_user);
3302 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3308 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3309 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3310 in which case error_mark_node is returned.
3312 If PARM_LIST is non-NULL, also make sure that the template parameter
3313 list of TEMPLATE_DECL matches.
3315 If COMPLAIN zero, don't complain about any errors that occur. */
3318 make_unbound_class_template (tree context, tree name, tree parm_list,
3319 tsubst_flags_t complain)
3325 name = TYPE_IDENTIFIER (name);
3326 else if (DECL_P (name))
3327 name = DECL_NAME (name);
3328 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3330 if (!dependent_type_p (context)
3331 || currently_open_class (context))
3333 tree tmpl = NULL_TREE;
3335 if (MAYBE_CLASS_TYPE_P (context))
3336 tmpl = lookup_field (context, name, 0, false);
3338 if (tmpl && TREE_CODE (tmpl) == TYPE_DECL)
3339 tmpl = maybe_get_template_decl_from_type_decl (tmpl);
3341 if (!tmpl || !DECL_TYPE_TEMPLATE_P (tmpl))
3343 if (complain & tf_error)
3344 error ("no class template named %q#T in %q#T", name, context);
3345 return error_mark_node;
3349 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3351 if (complain & tf_error)
3353 error ("template parameters do not match template");
3354 error ("%q+D declared here", tmpl);
3356 return error_mark_node;
3359 if (complain & tf_error)
3360 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3365 /* Build the UNBOUND_CLASS_TEMPLATE. */
3366 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3367 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3368 TREE_TYPE (t) = NULL_TREE;
3369 SET_TYPE_STRUCTURAL_EQUALITY (t);
3371 /* Build the corresponding TEMPLATE_DECL. */
3372 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3373 TYPE_NAME (TREE_TYPE (d)) = d;
3374 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3375 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3376 DECL_ARTIFICIAL (d) = 1;
3377 DECL_TEMPLATE_PARMS (d) = parm_list;
3384 /* Push the declarations of builtin types into the namespace.
3385 RID_INDEX is the index of the builtin type in the array
3386 RID_POINTERS. NAME is the name used when looking up the builtin
3387 type. TYPE is the _TYPE node for the builtin type. */
3390 record_builtin_type (enum rid rid_index,
3394 tree rname = NULL_TREE, tname = NULL_TREE;
3395 tree tdecl = NULL_TREE;
3397 if ((int) rid_index < (int) RID_MAX)
3398 rname = ridpointers[(int) rid_index];
3400 tname = get_identifier (name);
3402 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3403 eliminated. Built-in types should not be looked up name; their
3404 names are keywords that the parser can recognize. However, there
3405 is code in c-common.c that uses identifier_global_value to look
3406 up built-in types by name. */
3409 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3410 DECL_ARTIFICIAL (tdecl) = 1;
3411 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3417 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3418 DECL_ARTIFICIAL (tdecl) = 1;
3420 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3423 if (!TYPE_NAME (type))
3424 TYPE_NAME (type) = tdecl;
3427 debug_hooks->type_decl (tdecl, 0);
3430 /* Record one of the standard Java types.
3431 * Declare it as having the given NAME.
3432 * If SIZE > 0, it is the size of one of the integral types;
3433 * otherwise it is the negative of the size of one of the other types. */
3436 record_builtin_java_type (const char* name, int size)
3441 type = build_nonstandard_integer_type (size, 0);
3442 type = build_distinct_type_copy (type);
3444 else if (size > -32)
3447 /* "__java_char" or ""__java_boolean". */
3448 type = build_nonstandard_integer_type (-size, 1);
3449 type = build_distinct_type_copy (type);
3450 /* Get the signed type cached and attached to the unsigned type,
3451 so it doesn't get garbage-collected at "random" times,
3452 causing potential codegen differences out of different UIDs
3453 and different alias set numbers. */
3454 stype = build_nonstandard_integer_type (-size, 0);
3455 stype = build_distinct_type_copy (stype);
3456 TREE_CHAIN (type) = stype;
3457 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3460 { /* "__java_float" or ""__java_double". */
3461 type = make_node (REAL_TYPE);
3462 TYPE_PRECISION (type) = - size;
3465 record_builtin_type (RID_MAX, name, type);
3466 decl = TYPE_NAME (type);
3468 /* Suppress generate debug symbol entries for these types,
3469 since for normal C++ they are just clutter.
3470 However, push_lang_context undoes this if extern "Java" is seen. */
3471 DECL_IGNORED_P (decl) = 1;
3473 TYPE_FOR_JAVA (type) = 1;
3477 /* Push a type into the namespace so that the back ends ignore it. */
3480 record_unknown_type (tree type, const char* name)
3482 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3483 TYPE_DECL, get_identifier (name), type));
3484 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3485 DECL_IGNORED_P (decl) = 1;
3486 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3487 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3488 TYPE_ALIGN (type) = 1;
3489 TYPE_USER_ALIGN (type) = 0;
3490 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3493 /* A string for which we should create an IDENTIFIER_NODE at
3496 typedef struct predefined_identifier
3498 /* The name of the identifier. */
3499 const char *const name;
3500 /* The place where the IDENTIFIER_NODE should be stored. */
3502 /* Nonzero if this is the name of a constructor or destructor. */
3503 const int ctor_or_dtor_p;
3504 } predefined_identifier;
3506 /* Create all the predefined identifiers. */
3509 initialize_predefined_identifiers (void)
3511 const predefined_identifier *pid;
3513 /* A table of identifiers to create at startup. */
3514 static const predefined_identifier predefined_identifiers[] = {
3515 { "C++", &lang_name_cplusplus, 0 },
3516 { "C", &lang_name_c, 0 },
3517 { "Java", &lang_name_java, 0 },
3518 /* Some of these names have a trailing space so that it is
3519 impossible for them to conflict with names written by users. */
3520 { "__ct ", &ctor_identifier, 1 },
3521 { "__base_ctor ", &base_ctor_identifier, 1 },
3522 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3523 { "__dt ", &dtor_identifier, 1 },
3524 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3525 { "__base_dtor ", &base_dtor_identifier, 1 },
3526 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3527 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3528 { "nelts", &nelts_identifier, 0 },
3529 { THIS_NAME, &this_identifier, 0 },
3530 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3531 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3532 { "_vptr", &vptr_identifier, 0 },
3533 { "__vtt_parm", &vtt_parm_identifier, 0 },
3534 { "::", &global_scope_name, 0 },
3535 { "std", &std_identifier, 0 },
3539 for (pid = predefined_identifiers; pid->name; ++pid)
3541 *pid->node = get_identifier (pid->name);
3542 if (pid->ctor_or_dtor_p)
3543 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3547 /* Create the predefined scalar types of C,
3548 and some nodes representing standard constants (0, 1, (void *)0).
3549 Initialize the global binding level.
3550 Make definitions for built-in primitive functions. */
3553 cxx_init_decl_processing (void)
3556 tree void_ftype_ptr;
3558 /* Create all the identifiers we need. */
3559 initialize_predefined_identifiers ();
3561 /* Create the global variables. */
3562 push_to_top_level ();
3564 current_function_decl = NULL_TREE;
3565 current_binding_level = NULL;
3566 /* Enter the global namespace. */
3567 gcc_assert (global_namespace == NULL_TREE);
3568 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3570 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3571 TREE_PUBLIC (global_namespace) = 1;
3572 begin_scope (sk_namespace, global_namespace);
3574 if (flag_visibility_ms_compat)
3575 default_visibility = VISIBILITY_HIDDEN;
3578 current_lang_name = lang_name_c;
3580 /* Create the `std' namespace. */
3581 push_namespace (std_identifier);
3582 std_node = current_namespace;
3585 c_common_nodes_and_builtins ();
3587 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3588 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3589 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3590 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3591 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3592 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3593 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3594 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3596 integer_two_node = build_int_cst (NULL_TREE, 2);
3598 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3599 truthvalue_type_node = boolean_type_node;
3600 truthvalue_false_node = boolean_false_node;
3601 truthvalue_true_node = boolean_true_node;
3603 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3604 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3605 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3608 record_builtin_type (RID_MAX, NULL, string_type_node);
3611 delta_type_node = ptrdiff_type_node;
3612 vtable_index_type = ptrdiff_type_node;
3614 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3615 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3616 void_ftype_ptr = build_function_type_list (void_type_node,
3617 ptr_type_node, NULL_TREE);
3619 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3621 /* C++ extensions */
3623 unknown_type_node = make_node (LANG_TYPE);
3624 record_unknown_type (unknown_type_node, "unknown type");
3626 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3627 TREE_TYPE (unknown_type_node) = unknown_type_node;
3629 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3631 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3632 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3634 init_list_type_node = make_node (LANG_TYPE);
3635 record_unknown_type (init_list_type_node, "init list");
3637 dependent_lambda_return_type_node = make_node (LANG_TYPE);
3638 record_unknown_type (dependent_lambda_return_type_node,
3639 "undeduced lambda return type");
3642 /* Make sure we get a unique function type, so we can give
3643 its pointer type a name. (This wins for gdb.) */
3644 tree vfunc_type = make_node (FUNCTION_TYPE);
3645 TREE_TYPE (vfunc_type) = integer_type_node;
3646 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3647 layout_type (vfunc_type);
3649 vtable_entry_type = build_pointer_type (vfunc_type);
3651 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3654 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3655 layout_type (vtbl_type_node);
3656 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3657 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3658 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3659 layout_type (vtbl_ptr_type_node);
3660 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3662 push_namespace (get_identifier ("__cxxabiv1"));
3663 abi_node = current_namespace;
3666 global_type_node = make_node (LANG_TYPE);
3667 record_unknown_type (global_type_node, "global type");
3670 current_lang_name = lang_name_cplusplus;
3673 tree newattrs, extvisattr;
3674 tree newtype, deltype;
3675 tree ptr_ftype_sizetype;
3679 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3680 if (cxx_dialect == cxx98)
3683 tree bad_alloc_type_node;
3684 tree bad_alloc_decl;
3686 push_namespace (std_identifier);
3687 bad_alloc_id = get_identifier ("bad_alloc");
3688 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3689 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3691 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3692 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3696 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3699 new_eh_spec = noexcept_false_spec;
3701 /* Ensure attribs.c is initialized. */
3703 extvisattr = build_tree_list (get_identifier ("externally_visible"),
3705 newattrs = tree_cons (get_identifier ("alloc_size"),
3706 build_tree_list (NULL_TREE, integer_one_node),
3708 newtype = cp_build_type_attribute_variant (ptr_ftype_sizetype, newattrs);
3709 newtype = build_exception_variant (newtype, new_eh_spec);
3710 deltype = cp_build_type_attribute_variant (void_ftype_ptr, extvisattr);
3711 deltype = build_exception_variant (deltype, empty_except_spec);
3712 push_cp_library_fn (NEW_EXPR, newtype);
3713 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3714 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3715 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3717 nullptr_type_node = make_node (NULLPTR_TYPE);
3718 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3719 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3720 TYPE_UNSIGNED (nullptr_type_node) = 1;
3721 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3722 SET_TYPE_MODE (nullptr_type_node, ptr_mode);
3723 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3724 nullptr_node = build_int_cst (nullptr_type_node, 0);
3728 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3730 /* Perform other language dependent initializations. */
3731 init_class_processing ();
3732 init_rtti_processing ();
3733 init_template_processing ();
3735 if (flag_exceptions)
3736 init_exception_processing ();
3738 if (! supports_one_only ())
3741 make_fname_decl = cp_make_fname_decl;
3742 start_fname_decls ();
3744 /* Show we use EH for cleanups. */
3745 if (flag_exceptions)
3746 using_eh_for_cleanups ();
3749 /* Generate an initializer for a function naming variable from
3750 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3751 filled in with the type of the init. */
3754 cp_fname_init (const char* name, tree *type_p)
3756 tree domain = NULL_TREE;
3758 tree init = NULL_TREE;
3763 length = strlen (name);
3764 domain = build_index_type (size_int (length));
3765 init = build_string (length + 1, name);
3768 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3769 type = build_cplus_array_type (type, domain);
3774 TREE_TYPE (init) = type;
3776 init = error_mark_node;
3781 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3782 the decl, LOC is the location to give the decl, NAME is the
3783 initialization string and TYPE_DEP indicates whether NAME depended
3784 on the type of the function. We make use of that to detect
3785 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3786 at the point of first use, so we mustn't push the decl now. */
3789 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3791 const char *const name = (type_dep && processing_template_decl
3792 ? NULL : fname_as_string (type_dep));
3794 tree init = cp_fname_init (name, &type);
3795 tree decl = build_decl (loc, VAR_DECL, id, type);
3798 free (CONST_CAST (char *, name));
3800 /* As we're using pushdecl_with_scope, we must set the context. */
3801 DECL_CONTEXT (decl) = current_function_decl;
3802 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3804 TREE_STATIC (decl) = 1;
3805 TREE_READONLY (decl) = 1;
3806 DECL_ARTIFICIAL (decl) = 1;
3808 TREE_USED (decl) = 1;
3810 if (current_function_decl)
3812 cp_binding_level *b = current_binding_level;
3813 if (b->kind == sk_function_parms)
3814 return error_mark_node;
3815 while (b->level_chain->kind != sk_function_parms)
3817 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3818 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3819 LOOKUP_ONLYCONVERTING);
3823 DECL_THIS_STATIC (decl) = true;
3824 pushdecl_top_level_and_finish (decl, init);
3831 builtin_function_1 (tree decl, tree context, bool is_global)
3833 tree id = DECL_NAME (decl);
3834 const char *name = IDENTIFIER_POINTER (id);
3836 retrofit_lang_decl (decl);
3838 DECL_ARTIFICIAL (decl) = 1;
3839 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3840 SET_DECL_LANGUAGE (decl, lang_c);
3841 /* Runtime library routines are, by definition, available in an
3842 external shared object. */
3843 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3844 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3846 DECL_CONTEXT (decl) = context;
3849 pushdecl_top_level (decl);
3853 /* A function in the user's namespace should have an explicit
3854 declaration before it is used. Mark the built-in function as
3855 anticipated but not actually declared. */
3856 if (name[0] != '_' || name[1] != '_')
3857 DECL_ANTICIPATED (decl) = 1;
3858 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3860 size_t len = strlen (name);
3862 /* Treat __*_chk fortification functions as anticipated as well,
3863 unless they are __builtin_*. */
3864 if (len > strlen ("___chk")
3865 && memcmp (name + len - strlen ("_chk"),
3866 "_chk", strlen ("_chk") + 1) == 0)
3867 DECL_ANTICIPATED (decl) = 1;
3874 cxx_builtin_function (tree decl)
3876 tree id = DECL_NAME (decl);
3877 const char *name = IDENTIFIER_POINTER (id);
3878 /* All builtins that don't begin with an '_' should additionally
3879 go in the 'std' namespace. */
3882 tree decl2 = copy_node(decl);
3883 push_namespace (std_identifier);
3884 builtin_function_1 (decl2, std_node, false);
3888 return builtin_function_1 (decl, NULL_TREE, false);
3891 /* Like cxx_builtin_function, but guarantee the function is added to the global
3892 scope. This is to allow function specific options to add new machine
3893 dependent builtins when the target ISA changes via attribute((target(...)))
3894 which saves space on program startup if the program does not use non-generic
3898 cxx_builtin_function_ext_scope (tree decl)
3901 tree id = DECL_NAME (decl);
3902 const char *name = IDENTIFIER_POINTER (id);
3903 /* All builtins that don't begin with an '_' should additionally
3904 go in the 'std' namespace. */
3907 tree decl2 = copy_node(decl);
3908 push_namespace (std_identifier);
3909 builtin_function_1 (decl2, std_node, true);
3913 return builtin_function_1 (decl, NULL_TREE, true);
3916 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3917 function. Not called directly. */
3920 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3922 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3923 DECL_EXTERNAL (fn) = 1;
3924 TREE_PUBLIC (fn) = 1;
3925 DECL_ARTIFICIAL (fn) = 1;
3926 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3927 SET_DECL_LANGUAGE (fn, lang_c);
3928 /* Runtime library routines are, by definition, available in an
3929 external shared object. */
3930 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3931 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3935 /* Returns the _DECL for a library function with C linkage.
3936 We assume that such functions never throw; if this is incorrect,
3937 callers should unset TREE_NOTHROW. */
3940 build_library_fn (tree name, tree type)
3942 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3943 TREE_NOTHROW (fn) = 1;
3947 /* Returns the _DECL for a library function with C++ linkage. */
3950 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3952 tree fn = build_library_fn_1 (name, operator_code, type);
3953 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3954 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3955 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3959 /* Like build_library_fn, but takes a C string instead of an
3963 build_library_fn_ptr (const char* name, tree type)
3965 return build_library_fn (get_identifier (name), type);
3968 /* Like build_cp_library_fn, but takes a C string instead of an
3972 build_cp_library_fn_ptr (const char* name, tree type)
3974 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3977 /* Like build_library_fn, but also pushes the function so that we will
3978 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3979 may throw exceptions listed in RAISES. */
3982 push_library_fn (tree name, tree type, tree raises)
3987 type = build_exception_variant (type, raises);
3989 fn = build_library_fn (name, type);
3990 pushdecl_top_level (fn);
3994 /* Like build_cp_library_fn, but also pushes the function so that it
3995 will be found by normal lookup. */
3998 push_cp_library_fn (enum tree_code operator_code, tree type)
4000 tree fn = build_cp_library_fn (ansi_opname (operator_code),
4005 apply_tm_attr (fn, get_identifier ("transaction_safe"));
4009 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
4013 push_void_library_fn (tree name, tree parmtypes)
4015 tree type = build_function_type (void_type_node, parmtypes);
4016 return push_library_fn (name, type, NULL_TREE);
4019 /* Like push_library_fn, but also note that this function throws
4020 and does not return. Used for __throw_foo and the like. */
4023 push_throw_library_fn (tree name, tree type)
4025 tree fn = push_library_fn (name, type, NULL_TREE);
4026 TREE_THIS_VOLATILE (fn) = 1;
4027 TREE_NOTHROW (fn) = 0;
4031 /* When we call finish_struct for an anonymous union, we create
4032 default copy constructors and such. But, an anonymous union
4033 shouldn't have such things; this function undoes the damage to the
4034 anonymous union type T.
4036 (The reason that we create the synthesized methods is that we don't
4037 distinguish `union { int i; }' from `typedef union { int i; } U'.
4038 The first is an anonymous union; the second is just an ordinary
4042 fixup_anonymous_aggr (tree t)
4046 /* Wipe out memory of synthesized methods. */
4047 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
4048 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
4049 TYPE_HAS_COPY_CTOR (t) = 0;
4050 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
4051 TYPE_HAS_COPY_ASSIGN (t) = 0;
4052 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
4054 /* Splice the implicitly generated functions out of the TYPE_METHODS
4056 q = &TYPE_METHODS (t);
4059 if (DECL_ARTIFICIAL (*q))
4060 *q = TREE_CHAIN (*q);
4062 q = &DECL_CHAIN (*q);
4065 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
4066 if (TYPE_METHODS (t))
4068 tree decl = TYPE_MAIN_DECL (t);
4070 if (TREE_CODE (t) != UNION_TYPE)
4071 error_at (DECL_SOURCE_LOCATION (decl),
4072 "an anonymous struct cannot have function members");
4074 error_at (DECL_SOURCE_LOCATION (decl),
4075 "an anonymous union cannot have function members");
4078 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
4079 assignment operators (because they cannot have these methods themselves).
4080 For anonymous unions this is already checked because they are not allowed
4081 in any union, otherwise we have to check it. */
4082 if (TREE_CODE (t) != UNION_TYPE)
4086 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
4087 if (TREE_CODE (field) == FIELD_DECL)
4089 type = TREE_TYPE (field);
4090 if (CLASS_TYPE_P (type))
4092 if (TYPE_NEEDS_CONSTRUCTING (type))
4093 error ("member %q+#D with constructor not allowed "
4094 "in anonymous aggregate", field);
4095 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4096 error ("member %q+#D with destructor not allowed "
4097 "in anonymous aggregate", field);
4098 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
4099 error ("member %q+#D with copy assignment operator "
4100 "not allowed in anonymous aggregate", field);
4106 /* Make sure that a declaration with no declarator is well-formed, i.e.
4107 just declares a tagged type or anonymous union.
4109 Returns the type declared; or NULL_TREE if none. */
4112 check_tag_decl (cp_decl_specifier_seq *declspecs)
4114 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
4115 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
4116 /* If a class, struct, or enum type is declared by the DECLSPECS
4117 (i.e, if a class-specifier, enum-specifier, or non-typename
4118 elaborated-type-specifier appears in the DECLSPECS),
4119 DECLARED_TYPE is set to the corresponding type. */
4120 tree declared_type = NULL_TREE;
4121 bool error_p = false;
4123 if (declspecs->multiple_types_p)
4124 error ("multiple types in one declaration");
4125 else if (declspecs->redefined_builtin_type)
4127 if (!in_system_header)
4128 permerror (input_location, "redeclaration of C++ built-in type %qT",
4129 declspecs->redefined_builtin_type);
4134 && TYPE_P (declspecs->type)
4135 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
4136 && MAYBE_CLASS_TYPE_P (declspecs->type))
4137 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
4138 declared_type = declspecs->type;
4139 else if (declspecs->type == error_mark_node)
4141 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
4142 permerror (input_location, "declaration does not declare anything");
4143 /* Check for an anonymous union. */
4144 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
4145 && TYPE_ANONYMOUS_P (declared_type))
4147 /* 7/3 In a simple-declaration, the optional init-declarator-list
4148 can be omitted only when declaring a class (clause 9) or
4149 enumeration (7.2), that is, when the decl-specifier-seq contains
4150 either a class-specifier, an elaborated-type-specifier with
4151 a class-key (9.1), or an enum-specifier. In these cases and
4152 whenever a class-specifier or enum-specifier is present in the
4153 decl-specifier-seq, the identifiers in these specifiers are among
4154 the names being declared by the declaration (as class-name,
4155 enum-names, or enumerators, depending on the syntax). In such
4156 cases, and except for the declaration of an unnamed bit-field (9.6),
4157 the decl-specifier-seq shall introduce one or more names into the
4158 program, or shall redeclare a name introduced by a previous
4159 declaration. [Example:
4160 enum { }; // ill-formed
4161 typedef class { }; // ill-formed
4165 error ("missing type-name in typedef-declaration");
4168 /* Anonymous unions are objects, so they can have specifiers. */;
4169 SET_ANON_AGGR_TYPE_P (declared_type);
4171 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4172 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4177 if (declspecs->specs[(int)ds_inline]
4178 || declspecs->specs[(int)ds_virtual])
4179 error ("%qs can only be specified for functions",
4180 declspecs->specs[(int)ds_inline]
4181 ? "inline" : "virtual");
4183 && (!current_class_type
4184 || current_scope () != current_class_type))
4185 error ("%<friend%> can only be specified inside a class");
4186 else if (declspecs->specs[(int)ds_explicit])
4187 error ("%<explicit%> can only be specified for constructors");
4188 else if (declspecs->storage_class)
4189 error ("a storage class can only be specified for objects "
4191 else if (declspecs->specs[(int)ds_const]
4192 || declspecs->specs[(int)ds_volatile]
4193 || declspecs->specs[(int)ds_restrict]
4194 || declspecs->specs[(int)ds_thread])
4195 error ("qualifiers can only be specified for objects "
4197 else if (saw_typedef)
4198 warning (0, "%<typedef%> was ignored in this declaration");
4199 else if (declspecs->specs[(int) ds_constexpr])
4200 error ("%<constexpr%> cannot be used for type declarations");
4203 return declared_type;
4206 /* Called when a declaration is seen that contains no names to declare.
4207 If its type is a reference to a structure, union or enum inherited
4208 from a containing scope, shadow that tag name for the current scope
4209 with a forward reference.
4210 If its type defines a new named structure or union
4211 or defines an enum, it is valid but we need not do anything here.
4212 Otherwise, it is an error.
4214 C++: may have to grok the declspecs to learn about static,
4215 complain for anonymous unions.
4217 Returns the TYPE declared -- or NULL_TREE if none. */
4220 shadow_tag (cp_decl_specifier_seq *declspecs)
4222 tree t = check_tag_decl (declspecs);
4227 if (declspecs->attributes)
4229 warning (0, "attribute ignored in declaration of %q+#T", t);
4230 warning (0, "attribute for %q+#T must follow the %qs keyword",
4231 t, class_key_or_enum_as_string (t));
4235 if (maybe_process_partial_specialization (t) == error_mark_node)
4238 /* This is where the variables in an anonymous union are
4239 declared. An anonymous union declaration looks like:
4241 because there is no declarator after the union, the parser
4242 sends that declaration here. */
4243 if (ANON_AGGR_TYPE_P (t))
4245 fixup_anonymous_aggr (t);
4247 if (TYPE_FIELDS (t))
4249 tree decl = grokdeclarator (/*declarator=*/NULL,
4250 declspecs, NORMAL, 0, NULL);
4251 finish_anon_union (decl);
4258 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4261 groktypename (cp_decl_specifier_seq *type_specifiers,
4262 const cp_declarator *declarator,
4263 bool is_template_arg)
4267 enum decl_context context
4268 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4269 attrs = type_specifiers->attributes;
4270 type_specifiers->attributes = NULL_TREE;
4271 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4272 if (attrs && type != error_mark_node)
4274 if (CLASS_TYPE_P (type))
4275 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4276 "outside of definition", type);
4277 else if (MAYBE_CLASS_TYPE_P (type))
4278 /* A template type parameter or other dependent type. */
4279 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4280 "type %qT without an associated declaration", type);
4282 cplus_decl_attributes (&type, attrs, 0);
4287 /* Process a DECLARATOR for a function-scope variable declaration,
4288 namespace-scope variable declaration, or function declaration.
4289 (Function definitions go through start_function; class member
4290 declarations appearing in the body of the class go through
4291 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4292 If an error occurs, the error_mark_node is returned instead.
4294 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4295 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4296 for an explicitly defaulted function, or SD_DELETED for an explicitly
4297 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4298 implicitly initialized via a default constructor. ATTRIBUTES and
4299 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4301 The scope represented by the context of the returned DECL is pushed
4302 (if it is not the global namespace) and is assigned to
4303 *PUSHED_SCOPE_P. The caller is then responsible for calling
4304 pop_scope on *PUSHED_SCOPE_P if it is set. */
4307 start_decl (const cp_declarator *declarator,
4308 cp_decl_specifier_seq *declspecs,
4311 tree prefix_attributes,
4312 tree *pushed_scope_p)
4320 *pushed_scope_p = NULL_TREE;
4322 /* An object declared as __attribute__((deprecated)) suppresses
4323 warnings of uses of other deprecated items. */
4324 if (lookup_attribute ("deprecated", attributes))
4325 deprecated_state = DEPRECATED_SUPPRESS;
4327 attributes = chainon (attributes, prefix_attributes);
4329 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4332 deprecated_state = DEPRECATED_NORMAL;
4334 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4335 || decl == error_mark_node)
4336 return error_mark_node;
4338 context = CP_DECL_CONTEXT (decl);
4339 if (context != global_namespace)
4340 *pushed_scope_p = push_scope (context);
4343 /* Is it valid for this decl to have an initializer at all?
4344 If not, set INITIALIZED to zero, which will indirectly
4345 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4346 switch (TREE_CODE (decl))
4349 error ("typedef %qD is initialized (use decltype instead)", decl);
4350 return error_mark_node;
4353 if (initialized == SD_DELETED)
4354 /* We'll handle the rest of the semantics later, but we need to
4355 set this now so it's visible to duplicate_decls. */
4356 DECL_DELETED_FN (decl) = 1;
4365 if (! toplevel_bindings_p ()
4366 && DECL_EXTERNAL (decl))
4367 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4369 DECL_EXTERNAL (decl) = 0;
4370 if (toplevel_bindings_p ())
4371 TREE_STATIC (decl) = 1;
4373 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4375 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4376 record_key_method_defined (decl);
4378 /* If this is a typedef that names the class for linkage purposes
4379 (7.1.3p8), apply any attributes directly to the type. */
4380 if (TREE_CODE (decl) == TYPE_DECL
4381 && TAGGED_TYPE_P (TREE_TYPE (decl))
4382 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4383 flags = ATTR_FLAG_TYPE_IN_PLACE;
4387 /* Set attributes here so if duplicate decl, will have proper attributes. */
4388 cplus_decl_attributes (&decl, attributes, flags);
4390 /* Dllimported symbols cannot be defined. Static data members (which
4391 can be initialized in-class and dllimported) go through grokfield,
4392 not here, so we don't need to exclude those decls when checking for
4394 if (initialized && DECL_DLLIMPORT_P (decl))
4396 error ("definition of %q#D is marked %<dllimport%>", decl);
4397 DECL_DLLIMPORT_P (decl) = 0;
4400 /* If #pragma weak was used, mark the decl weak now. */
4401 maybe_apply_pragma_weak (decl);
4403 if (TREE_CODE (decl) == FUNCTION_DECL
4404 && DECL_DECLARED_INLINE_P (decl)
4405 && DECL_UNINLINABLE (decl)
4406 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4407 warning (0, "inline function %q+D given attribute noinline", decl);
4409 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4411 if (TREE_CODE (decl) == VAR_DECL)
4413 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4414 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4415 error ("%q#D is not a static member of %q#T", decl, context);
4418 if (DECL_CONTEXT (field) != context)
4420 if (!same_type_p (DECL_CONTEXT (field), context))
4421 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4422 "to be defined as %<%T::%D%>",
4423 DECL_CONTEXT (field), DECL_NAME (decl),
4424 context, DECL_NAME (decl));
4425 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4427 if (processing_specialization
4428 && template_class_depth (context) == 0
4429 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4430 error ("template header not allowed in member definition "
4431 "of explicitly specialized class");
4432 /* Static data member are tricky; an in-class initialization
4433 still doesn't provide a definition, so the in-class
4434 declaration will have DECL_EXTERNAL set, but will have an
4435 initialization. Thus, duplicate_decls won't warn
4436 about this situation, and so we check here. */
4437 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4438 error ("duplicate initialization of %qD", decl);
4439 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4441 if (declspecs->specs[(int) ds_constexpr]
4442 && !DECL_DECLARED_CONSTEXPR_P (field))
4443 error ("%qD declared %<constexpr%> outside its class", field);
4448 tree field = check_classfn (context, decl,
4449 (processing_template_decl
4450 > template_class_depth (context))
4451 ? current_template_parms
4453 if (field && field != error_mark_node
4454 && duplicate_decls (decl, field,
4455 /*newdecl_is_friend=*/false))
4459 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4460 DECL_IN_AGGR_P (decl) = 0;
4461 /* Do not mark DECL as an explicit specialization if it was not
4462 already marked as an instantiation; a declaration should
4463 never be marked as a specialization unless we know what
4464 template is being specialized. */
4465 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4467 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4469 /* [temp.expl.spec] An explicit specialization of a static data
4470 member of a template is a definition if the declaration
4471 includes an initializer; otherwise, it is a declaration.
4473 We check for processing_specialization so this only applies
4474 to the new specialization syntax. */
4475 if (!initialized && processing_specialization)
4476 DECL_EXTERNAL (decl) = 1;
4479 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4480 /* Aliases are definitions. */
4482 permerror (input_location, "declaration of %q#D outside of class is not definition",
4486 was_public = TREE_PUBLIC (decl);
4488 /* Enter this declaration into the symbol table. */
4489 decl = maybe_push_decl (decl);
4491 if (processing_template_decl)
4492 decl = push_template_decl (decl);
4493 if (decl == error_mark_node)
4494 return error_mark_node;
4496 /* Tell the back end to use or not use .common as appropriate. If we say
4497 -fconserve-space, we want this to save .data space, at the expense of
4498 wrong semantics. If we say -fno-conserve-space, we want this to
4499 produce errors about redefs; to do this we force variables into the
4501 if (flag_conserve_space
4502 && TREE_CODE (decl) == VAR_DECL
4503 && TREE_PUBLIC (decl)
4504 && !DECL_THREAD_LOCAL_P (decl)
4505 && !have_global_bss_p ())
4506 DECL_COMMON (decl) = 1;
4508 if (TREE_CODE (decl) == VAR_DECL
4509 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4510 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4512 /* This is a const variable with implicit 'static'. Set
4513 DECL_THIS_STATIC so we can tell it from variables that are
4514 !TREE_PUBLIC because of the anonymous namespace. */
4515 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)) || errorcount);
4516 DECL_THIS_STATIC (decl) = 1;
4519 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4520 start_decl_1 (decl, initialized);
4525 /* Process the declaration of a variable DECL. INITIALIZED is true
4526 iff DECL is explicitly initialized. (INITIALIZED is false if the
4527 variable is initialized via an implicitly-called constructor.)
4528 This function must be called for ordinary variables (including, for
4529 example, implicit instantiations of templates), but must not be
4530 called for template declarations. */
4533 start_decl_1 (tree decl, bool initialized)
4537 bool aggregate_definition_p;
4539 gcc_assert (!processing_template_decl);
4541 if (error_operand_p (decl))
4544 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4546 type = TREE_TYPE (decl);
4547 complete_p = COMPLETE_TYPE_P (type);
4548 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4550 /* If an explicit initializer is present, or if this is a definition
4551 of an aggregate, then we need a complete type at this point.
4552 (Scalars are always complete types, so there is nothing to
4553 check.) This code just sets COMPLETE_P; errors (if necessary)
4554 are issued below. */
4555 if ((initialized || aggregate_definition_p)
4557 && COMPLETE_TYPE_P (complete_type (type)))
4560 /* We will not yet have set TREE_READONLY on DECL if the type
4561 was "const", but incomplete, before this point. But, now, we
4562 have a complete type, so we can try again. */
4563 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4567 /* Is it valid for this decl to have an initializer at all? */
4569 /* Don't allow initializations for incomplete types except for
4570 arrays which might be completed by the initialization. */
4572 ; /* A complete type is ok. */
4573 else if (type_uses_auto (type))
4574 ; /* An auto type is ok. */
4575 else if (TREE_CODE (type) != ARRAY_TYPE)
4577 error ("variable %q#D has initializer but incomplete type", decl);
4578 type = TREE_TYPE (decl) = error_mark_node;
4580 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4582 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4583 error ("elements of array %q#D have incomplete type", decl);
4584 /* else we already gave an error in start_decl. */
4587 else if (aggregate_definition_p && !complete_p)
4589 if (type_uses_auto (type))
4590 error ("declaration of %q#D has no initializer", decl);
4592 error ("aggregate %q#D has incomplete type and cannot be defined",
4594 /* Change the type so that assemble_variable will give
4595 DECL an rtl we can live with: (mem (const_int 0)). */
4596 type = TREE_TYPE (decl) = error_mark_node;
4599 /* Create a new scope to hold this declaration if necessary.
4600 Whether or not a new scope is necessary cannot be determined
4601 until after the type has been completed; if the type is a
4602 specialization of a class template it is not until after
4603 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4604 will be set correctly. */
4605 maybe_push_cleanup_level (type);
4608 /* Handle initialization of references. DECL, TYPE, and INIT have the
4609 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4610 but will be set to a new CLEANUP_STMT if a temporary is created
4611 that must be destroyed subsequently.
4613 Returns an initializer expression to use to initialize DECL, or
4614 NULL if the initialization can be performed statically.
4616 Quotes on semantics can be found in ARM 8.4.3. */
4619 grok_reference_init (tree decl, tree type, tree init, int flags)
4621 if (init == NULL_TREE)
4623 if ((DECL_LANG_SPECIFIC (decl) == 0
4624 || DECL_IN_AGGR_P (decl) == 0)
4625 && ! DECL_THIS_EXTERN (decl))
4626 error ("%qD declared as reference but not initialized", decl);
4630 if (TREE_CODE (init) == TREE_LIST)
4631 init = build_x_compound_expr_from_list (init, ELK_INIT,
4632 tf_warning_or_error);
4634 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4635 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4636 /* Note: default conversion is only called in very special cases. */
4637 init = decay_conversion (init);
4639 /* Convert INIT to the reference type TYPE. This may involve the
4640 creation of a temporary, whose lifetime must be the same as that
4641 of the reference. If so, a DECL_EXPR for the temporary will be
4642 added just after the DECL_EXPR for DECL. That's why we don't set
4643 DECL_INITIAL for local references (instead assigning to them
4644 explicitly); we need to allow the temporary to be initialized
4646 return initialize_reference (type, init, flags,
4647 tf_warning_or_error);
4650 /* Designated initializers in arrays are not supported in GNU C++.
4651 The parser cannot detect this error since it does not know whether
4652 a given brace-enclosed initializer is for a class type or for an
4653 array. This function checks that CE does not use a designated
4654 initializer. If it does, an error is issued. Returns true if CE
4655 is valid, i.e., does not have a designated initializer. */
4658 check_array_designated_initializer (const constructor_elt *ce,
4659 unsigned HOST_WIDE_INT index)
4661 /* Designated initializers for array elements are not supported. */
4664 /* The parser only allows identifiers as designated
4666 if (ce->index == error_mark_node)
4667 error ("name used in a GNU-style designated "
4668 "initializer for an array");
4669 else if (TREE_CODE (ce->index) == INTEGER_CST)
4671 /* A C99 designator is OK if it matches the current index. */
4672 if (TREE_INT_CST_LOW (ce->index) == index)
4675 sorry ("non-trivial designated initializers not supported");
4679 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4680 error ("name %qD used in a GNU-style designated "
4681 "initializer for an array", ce->index);
4689 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4690 array until we finish parsing the initializer. If that's the
4691 situation we're in, update DECL accordingly. */
4694 maybe_deduce_size_from_array_init (tree decl, tree init)
4696 tree type = TREE_TYPE (decl);
4698 if (TREE_CODE (type) == ARRAY_TYPE
4699 && TYPE_DOMAIN (type) == NULL_TREE
4700 && TREE_CODE (decl) != TYPE_DECL)
4702 /* do_default is really a C-ism to deal with tentative definitions.
4703 But let's leave it here to ease the eventual merge. */
4704 int do_default = !DECL_EXTERNAL (decl);
4705 tree initializer = init ? init : DECL_INITIAL (decl);
4708 /* Check that there are no designated initializers in INIT, as
4709 those are not supported in GNU C++, and as the middle-end
4710 will crash if presented with a non-numeric designated
4712 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4714 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4715 constructor_elt *ce;
4717 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4718 if (!check_array_designated_initializer (ce, i))
4724 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4728 error ("initializer fails to determine size of %qD", decl);
4729 TREE_TYPE (decl) = error_mark_node;
4731 else if (failure == 2)
4735 error ("array size missing in %qD", decl);
4736 TREE_TYPE (decl) = error_mark_node;
4738 /* If a `static' var's size isn't known, make it extern as
4739 well as static, so it does not get allocated. If it's not
4740 `static', then don't mark it extern; finish_incomplete_decl
4741 will give it a default size and it will get allocated. */
4742 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4743 DECL_EXTERNAL (decl) = 1;
4745 else if (failure == 3)
4747 error ("zero-size array %qD", decl);
4748 TREE_TYPE (decl) = error_mark_node;
4752 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4754 relayout_decl (decl);
4758 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4759 any appropriate error messages regarding the layout. */
4762 layout_var_decl (tree decl)
4766 type = TREE_TYPE (decl);
4767 if (type == error_mark_node)
4770 /* If we haven't already layed out this declaration, do so now.
4771 Note that we must not call complete type for an external object
4772 because it's type might involve templates that we are not
4773 supposed to instantiate yet. (And it's perfectly valid to say
4774 `extern X x' for some incomplete type `X'.) */
4775 if (!DECL_EXTERNAL (decl))
4776 complete_type (type);
4777 if (!DECL_SIZE (decl)
4778 && TREE_TYPE (decl) != error_mark_node
4779 && (COMPLETE_TYPE_P (type)
4780 || (TREE_CODE (type) == ARRAY_TYPE
4781 && !TYPE_DOMAIN (type)
4782 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4783 layout_decl (decl, 0);
4785 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4787 /* An automatic variable with an incomplete type: that is an error.
4788 Don't talk about array types here, since we took care of that
4789 message in grokdeclarator. */
4790 error ("storage size of %qD isn%'t known", decl);
4791 TREE_TYPE (decl) = error_mark_node;
4794 /* Keep this code around in case we later want to control debug info
4795 based on whether a type is "used". (jason 1999-11-11) */
4797 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4798 /* Let debugger know it should output info for this type. */
4799 note_debug_info_needed (ttype);
4801 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4802 note_debug_info_needed (DECL_CONTEXT (decl));
4805 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4806 && DECL_SIZE (decl) != NULL_TREE
4807 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4809 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4810 constant_expression_warning (DECL_SIZE (decl));
4813 error ("storage size of %qD isn%'t constant", decl);
4814 TREE_TYPE (decl) = error_mark_node;
4819 /* If a local static variable is declared in an inline function, or if
4820 we have a weak definition, we must endeavor to create only one
4821 instance of the variable at link-time. */
4824 maybe_commonize_var (tree decl)
4826 /* Static data in a function with comdat linkage also has comdat
4828 if (TREE_STATIC (decl)
4829 /* Don't mess with __FUNCTION__. */
4830 && ! DECL_ARTIFICIAL (decl)
4831 && DECL_FUNCTION_SCOPE_P (decl)
4832 && vague_linkage_p (DECL_CONTEXT (decl)))
4836 /* With weak symbols, we simply make the variable COMDAT;
4837 that will cause copies in multiple translations units to
4839 comdat_linkage (decl);
4843 if (DECL_INITIAL (decl) == NULL_TREE
4844 || DECL_INITIAL (decl) == error_mark_node)
4846 /* Without weak symbols, we can use COMMON to merge
4847 uninitialized variables. */
4848 TREE_PUBLIC (decl) = 1;
4849 DECL_COMMON (decl) = 1;
4853 /* While for initialized variables, we must use internal
4854 linkage -- which means that multiple copies will not
4856 TREE_PUBLIC (decl) = 0;
4857 DECL_COMMON (decl) = 0;
4858 warning_at (input_location, 0,
4859 "sorry: semantics of inline function static "
4860 "data %q+#D are wrong (you%'ll wind up "
4861 "with multiple copies)", decl);
4862 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4863 " you can work around this by removing "
4868 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4869 /* Set it up again; we might have set DECL_INITIAL since the last
4871 comdat_linkage (decl);
4874 /* Issue an error message if DECL is an uninitialized const variable. */
4877 check_for_uninitialized_const_var (tree decl)
4879 tree type = strip_array_types (TREE_TYPE (decl));
4881 /* ``Unless explicitly declared extern, a const object does not have
4882 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4884 if (TREE_CODE (decl) == VAR_DECL
4885 && TREE_CODE (type) != REFERENCE_TYPE
4886 && CP_TYPE_CONST_P (type)
4887 && !DECL_INITIAL (decl))
4889 tree field = default_init_uninitialized_part (type);
4893 permerror (DECL_SOURCE_LOCATION (decl),
4894 "uninitialized const %qD", decl);
4896 if (CLASS_TYPE_P (type))
4898 tree defaulted_ctor;
4900 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4901 "%q#T has no user-provided default constructor", type);
4902 defaulted_ctor = in_class_defaulted_default_constructor (type);
4904 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4905 "constructor is not user-provided because it is "
4906 "explicitly defaulted in the class body");
4907 inform (0, "and the implicitly-defined constructor does not "
4908 "initialize %q+#D", field);
4913 /* Structure holding the current initializer being processed by reshape_init.
4914 CUR is a pointer to the current element being processed, END is a pointer
4915 after the last element present in the initializer. */
4916 typedef struct reshape_iterator_t
4918 constructor_elt *cur;
4919 constructor_elt *end;
4922 static tree reshape_init_r (tree, reshape_iter *, bool, tsubst_flags_t);
4924 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4925 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4926 initialized. If there are no more such fields, the return value
4930 next_initializable_field (tree field)
4933 && (TREE_CODE (field) != FIELD_DECL
4934 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4935 || DECL_ARTIFICIAL (field)))
4936 field = DECL_CHAIN (field);
4941 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4942 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4943 INTEGER_CST representing the size of the array minus one (the maximum index),
4944 or NULL_TREE if the array was declared without specifying the size. D is
4945 the iterator within the constructor. */
4948 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d,
4949 tsubst_flags_t complain)
4952 bool sized_array_p = (max_index != NULL_TREE);
4953 unsigned HOST_WIDE_INT max_index_cst = 0;
4954 unsigned HOST_WIDE_INT index;
4956 /* The initializer for an array is always a CONSTRUCTOR. */
4957 new_init = build_constructor (init_list_type_node, NULL);
4961 /* Minus 1 is used for zero sized arrays. */
4962 if (integer_all_onesp (max_index))
4965 if (host_integerp (max_index, 1))
4966 max_index_cst = tree_low_cst (max_index, 1);
4967 /* sizetype is sign extended, not zero extended. */
4969 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4973 /* Loop until there are no more initializers. */
4975 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4980 check_array_designated_initializer (d->cur, index);
4981 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false,
4983 if (elt_init == error_mark_node)
4984 return error_mark_node;
4985 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init),
4986 size_int (index), elt_init);
4987 if (!TREE_CONSTANT (elt_init))
4988 TREE_CONSTANT (new_init) = false;
4994 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4995 Parameters are the same of reshape_init_r. */
4998 reshape_init_array (tree type, reshape_iter *d, tsubst_flags_t complain)
5000 tree max_index = NULL_TREE;
5002 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
5004 if (TYPE_DOMAIN (type))
5005 max_index = array_type_nelts (type);
5007 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5010 /* Subroutine of reshape_init_r, processes the initializers for vectors.
5011 Parameters are the same of reshape_init_r. */
5014 reshape_init_vector (tree type, reshape_iter *d, tsubst_flags_t complain)
5016 tree max_index = NULL_TREE;
5018 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
5020 if (COMPOUND_LITERAL_P (d->cur->value))
5022 tree value = d->cur->value;
5023 if (!same_type_p (TREE_TYPE (value), type))
5025 if (complain & tf_error)
5026 error ("invalid type %qT as initializer for a vector of type %qT",
5027 TREE_TYPE (d->cur->value), type);
5028 value = error_mark_node;
5034 /* For a vector, we initialize it as an array of the appropriate size. */
5035 if (TREE_CODE (type) == VECTOR_TYPE)
5036 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
5038 return reshape_init_array_1 (TREE_TYPE (type), max_index, d, complain);
5041 /* Subroutine of reshape_init_r, processes the initializers for classes
5042 or union. Parameters are the same of reshape_init_r. */
5045 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p,
5046 tsubst_flags_t complain)
5051 gcc_assert (CLASS_TYPE_P (type));
5053 /* The initializer for a class is always a CONSTRUCTOR. */
5054 new_init = build_constructor (init_list_type_node, NULL);
5055 field = next_initializable_field (TYPE_FIELDS (type));
5061 An initializer for an aggregate member that is an
5062 empty class shall have the form of an empty
5063 initializer-list {}. */
5064 if (!first_initializer_p)
5066 if (complain & tf_error)
5067 error ("initializer for %qT must be brace-enclosed", type);
5068 return error_mark_node;
5073 /* Loop through the initializable fields, gathering initializers. */
5074 while (d->cur != d->end)
5078 /* Handle designated initializers, as an extension. */
5081 if (TREE_CODE (d->cur->index) == INTEGER_CST)
5083 if (complain & tf_error)
5084 error ("%<[%E] =%> used in a GNU-style designated initializer"
5085 " for class %qT", d->cur->index, type);
5086 return error_mark_node;
5089 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
5091 if (!field || TREE_CODE (field) != FIELD_DECL)
5093 if (complain & tf_error)
5094 error ("%qT has no non-static data member named %qD", type,
5096 return error_mark_node;
5100 /* If we processed all the member of the class, we are done. */
5104 field_init = reshape_init_r (TREE_TYPE (field), d,
5105 /*first_initializer_p=*/false, complain);
5106 if (field_init == error_mark_node)
5107 return error_mark_node;
5109 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
5113 When a union is initialized with a brace-enclosed
5114 initializer, the braces shall only contain an
5115 initializer for the first member of the union. */
5116 if (TREE_CODE (type) == UNION_TYPE)
5119 field = next_initializable_field (DECL_CHAIN (field));
5125 /* Subroutine of reshape_init, which processes a single initializer (part of
5126 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
5127 iterator within the CONSTRUCTOR which points to the initializer to process.
5128 FIRST_INITIALIZER_P is true if this is the first initializer of the
5129 outermost CONSTRUCTOR node. */
5132 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p,
5133 tsubst_flags_t complain)
5135 tree init = d->cur->value;
5137 if (error_operand_p (init))
5138 return error_mark_node;
5140 if (TREE_CODE (type) == COMPLEX_TYPE)
5142 /* A complex type can be initialized from one or two initializers,
5143 but braces are not elided. */
5145 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5147 if (CONSTRUCTOR_NELTS (init) > 2)
5149 if (complain & tf_error)
5150 error ("too many initializers for %qT", type);
5152 return error_mark_node;
5155 else if (first_initializer_p && d->cur != d->end)
5157 VEC(constructor_elt, gc) *v = 0;
5158 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, init);
5159 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, d->cur->value);
5161 init = build_constructor (init_list_type_node, v);
5166 /* A non-aggregate type is always initialized with a single
5168 if (!CP_AGGREGATE_TYPE_P (type))
5170 /* It is invalid to initialize a non-aggregate type with a
5171 brace-enclosed initializer before C++0x.
5172 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5173 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5174 a CONSTRUCTOR (with a record type). */
5175 if (TREE_CODE (init) == CONSTRUCTOR
5176 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5178 if (SCALAR_TYPE_P (type))
5180 if (complain & tf_error)
5181 error ("braces around scalar initializer for type %qT", type);
5182 init = error_mark_node;
5185 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5194 All implicit type conversions (clause _conv_) are considered when
5195 initializing the aggregate member with an initializer from an
5196 initializer-list. If the initializer can initialize a member,
5197 the member is initialized. Otherwise, if the member is itself a
5198 non-empty subaggregate, brace elision is assumed and the
5199 initializer is considered for the initialization of the first
5200 member of the subaggregate. */
5201 if (TREE_CODE (init) != CONSTRUCTOR
5202 /* But don't try this for the first initializer, since that would be
5203 looking through the outermost braces; A a2 = { a1 }; is not a
5204 valid aggregate initialization. */
5205 && !first_initializer_p
5206 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5207 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5213 /* [dcl.init.string]
5215 A char array (whether plain char, signed char, or unsigned char)
5216 can be initialized by a string-literal (optionally enclosed in
5217 braces); a wchar_t array can be initialized by a wide
5218 string-literal (optionally enclosed in braces). */
5219 if (TREE_CODE (type) == ARRAY_TYPE
5220 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5222 tree str_init = init;
5224 /* Strip one level of braces if and only if they enclose a single
5225 element (as allowed by [dcl.init.string]). */
5226 if (!first_initializer_p
5227 && TREE_CODE (str_init) == CONSTRUCTOR
5228 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5230 str_init = VEC_index (constructor_elt,
5231 CONSTRUCTOR_ELTS (str_init), 0)->value;
5234 /* If it's a string literal, then it's the initializer for the array
5235 as a whole. Otherwise, continue with normal initialization for
5236 array types (one value per array element). */
5237 if (TREE_CODE (str_init) == STRING_CST)
5244 /* The following cases are about aggregates. If we are not within a full
5245 initializer already, and there is not a CONSTRUCTOR, it means that there
5246 is a missing set of braces (that is, we are processing the case for
5247 which reshape_init exists). */
5248 if (!first_initializer_p)
5250 if (TREE_CODE (init) == CONSTRUCTOR)
5252 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5253 /* There is no need to reshape pointer-to-member function
5254 initializers, as they are always constructed correctly
5255 by the front end. */
5257 else if (COMPOUND_LITERAL_P (init))
5258 /* For a nested compound literal, there is no need to reshape since
5259 brace elision is not allowed. Even if we decided to allow it,
5260 we should add a call to reshape_init in finish_compound_literal,
5261 before calling digest_init, so changing this code would still
5262 not be necessary. */
5263 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5267 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5268 return reshape_init (type, init, complain);
5272 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5276 /* Dispatch to specialized routines. */
5277 if (CLASS_TYPE_P (type))
5278 return reshape_init_class (type, d, first_initializer_p, complain);
5279 else if (TREE_CODE (type) == ARRAY_TYPE)
5280 return reshape_init_array (type, d, complain);
5281 else if (TREE_CODE (type) == VECTOR_TYPE)
5282 return reshape_init_vector (type, d, complain);
5287 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5288 brace-enclosed aggregate initializer.
5290 INIT is the CONSTRUCTOR containing the list of initializers describing
5291 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5292 It may not presently match the shape of the TYPE; for example:
5294 struct S { int a; int b; };
5295 struct S a[] = { 1, 2, 3, 4 };
5297 Here INIT will hold a VEC of four elements, rather than a
5298 VEC of two elements, each itself a VEC of two elements. This
5299 routine transforms INIT from the former form into the latter. The
5300 revised CONSTRUCTOR node is returned. */
5303 reshape_init (tree type, tree init, tsubst_flags_t complain)
5305 VEC(constructor_elt, gc) *v;
5309 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5311 v = CONSTRUCTOR_ELTS (init);
5313 /* An empty constructor does not need reshaping, and it is always a valid
5315 if (VEC_empty (constructor_elt, v))
5318 /* Recurse on this CONSTRUCTOR. */
5319 d.cur = VEC_index (constructor_elt, v, 0);
5320 d.end = d.cur + VEC_length (constructor_elt, v);
5322 new_init = reshape_init_r (type, &d, true, complain);
5323 if (new_init == error_mark_node)
5324 return error_mark_node;
5326 /* Make sure all the element of the constructor were used. Otherwise,
5327 issue an error about exceeding initializers. */
5330 if (complain & tf_error)
5331 error ("too many initializers for %qT", type);
5333 return error_mark_node;
5339 /* Verify array initializer. Returns true if errors have been reported. */
5342 check_array_initializer (tree decl, tree type, tree init)
5344 tree element_type = TREE_TYPE (type);
5346 /* The array type itself need not be complete, because the
5347 initializer may tell us how many elements are in the array.
5348 But, the elements of the array must be complete. */
5349 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5352 error ("elements of array %q#D have incomplete type", decl);
5354 error ("elements of array %q#T have incomplete type", type);
5357 /* It is not valid to initialize a VLA. */
5359 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5360 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5363 error ("variable-sized object %qD may not be initialized", decl);
5365 error ("variable-sized compound literal");
5371 /* Subroutine of check_initializer; args are passed down from that function.
5372 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5375 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5378 gcc_assert (stmts_are_full_exprs_p ());
5379 return build_aggr_init (decl, init, flags, tf_warning_or_error);
5382 /* Verify INIT (the initializer for DECL), and record the
5383 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5384 grok_reference_init.
5386 If the return value is non-NULL, it is an expression that must be
5387 evaluated dynamically to initialize DECL. */
5390 check_initializer (tree decl, tree init, int flags, VEC(tree,gc) **cleanups)
5392 tree type = TREE_TYPE (decl);
5393 tree init_code = NULL;
5394 tree extra_init = NULL_TREE;
5397 /* Things that are going to be initialized need to have complete
5399 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5401 if (DECL_HAS_VALUE_EXPR_P (decl))
5403 /* A variable with DECL_HAS_VALUE_EXPR_P set is just a placeholder,
5404 it doesn't have storage to be initialized. */
5405 gcc_assert (init == NULL_TREE);
5409 if (type == error_mark_node)
5410 /* We will have already complained. */
5413 if (TREE_CODE (type) == ARRAY_TYPE)
5415 if (check_array_initializer (decl, type, init))
5418 else if (!COMPLETE_TYPE_P (type))
5420 error ("%qD has incomplete type", decl);
5421 TREE_TYPE (decl) = error_mark_node;
5425 /* There is no way to make a variable-sized class type in GNU C++. */
5426 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5428 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5430 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5431 if (SCALAR_TYPE_P (type))
5435 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5436 init = build_zero_init (type, NULL_TREE, false);
5438 else if (init_len != 1 && TREE_CODE (type) != COMPLEX_TYPE)
5440 error ("scalar object %qD requires one element in initializer",
5442 TREE_TYPE (decl) = error_mark_node;
5448 if (TREE_CODE (decl) == CONST_DECL)
5450 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5452 DECL_INITIAL (decl) = init;
5454 gcc_assert (init != NULL_TREE);
5457 else if (!init && DECL_REALLY_EXTERN (decl))
5459 else if (init || type_build_ctor_call (type)
5460 || TREE_CODE (type) == REFERENCE_TYPE)
5462 if (TREE_CODE (type) == REFERENCE_TYPE)
5464 init = grok_reference_init (decl, type, init, flags);
5465 flags |= LOOKUP_ALREADY_DIGESTED;
5468 check_for_uninitialized_const_var (decl);
5469 /* Do not reshape constructors of vectors (they don't need to be
5471 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
5473 if (is_std_init_list (type))
5475 init = perform_implicit_conversion (type, init,
5476 tf_warning_or_error);
5477 flags |= LOOKUP_ALREADY_DIGESTED;
5479 else if (TYPE_NON_AGGREGATE_CLASS (type))
5481 /* Don't reshape if the class has constructors. */
5482 if (cxx_dialect == cxx98)
5483 error ("in C++98 %qD must be initialized by constructor, "
5487 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5489 error ("opaque vector types cannot be initialized");
5490 init = error_mark_node;
5494 init = reshape_init (type, init, tf_warning_or_error);
5495 if (SCALAR_TYPE_P (type))
5496 check_narrowing (type, init);
5500 /* If DECL has an array type without a specific bound, deduce the
5501 array size from the initializer. */
5502 maybe_deduce_size_from_array_init (decl, init);
5503 type = TREE_TYPE (decl);
5504 if (type == error_mark_node)
5507 if ((type_build_ctor_call (type) || CLASS_TYPE_P (type))
5508 && !(flags & LOOKUP_ALREADY_DIGESTED)
5509 && !(init && BRACE_ENCLOSED_INITIALIZER_P (init)
5510 && CP_AGGREGATE_TYPE_P (type)))
5512 init_code = build_aggr_init_full_exprs (decl, init, flags);
5514 /* If this is a constexpr initializer, expand_default_init will
5515 have returned an INIT_EXPR rather than a CALL_EXPR. In that
5516 case, pull the initializer back out and pass it down into
5517 store_init_value. */
5518 while (TREE_CODE (init_code) == EXPR_STMT
5519 || TREE_CODE (init_code) == CONVERT_EXPR)
5520 init_code = TREE_OPERAND (init_code, 0);
5521 if (TREE_CODE (init_code) == INIT_EXPR)
5523 init = TREE_OPERAND (init_code, 1);
5524 init_code = NULL_TREE;
5525 /* Don't call digest_init; it's unnecessary and will complain
5526 about aggregate initialization of non-aggregate classes. */
5527 flags |= LOOKUP_ALREADY_DIGESTED;
5529 else if (DECL_DECLARED_CONSTEXPR_P (decl))
5531 /* Declared constexpr, but no suitable initializer; massage
5532 init appropriately so we can pass it into store_init_value
5534 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5535 init = finish_compound_literal (type, init,
5536 tf_warning_or_error);
5537 else if (CLASS_TYPE_P (type)
5538 && (!init || TREE_CODE (init) == TREE_LIST))
5540 init = build_functional_cast (type, init, tf_none);
5541 if (init != error_mark_node)
5542 TARGET_EXPR_DIRECT_INIT_P (init) = true;
5544 init_code = NULL_TREE;
5550 if (init && TREE_CODE (init) != TREE_VEC)
5552 /* In aggregate initialization of a variable, each element
5553 initialization is a full-expression because there is no
5554 enclosing expression. */
5555 gcc_assert (stmts_are_full_exprs_p ());
5557 init_code = store_init_value (decl, init, cleanups, flags);
5559 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5560 && DECL_INITIAL (decl)
5561 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5562 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5563 warning (0, "array %qD initialized by parenthesized string literal %qE",
5564 decl, DECL_INITIAL (decl));
5570 if (CLASS_TYPE_P (core_type = strip_array_types (type))
5571 && (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5572 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type)))
5573 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5576 check_for_uninitialized_const_var (decl);
5579 if (init && init != error_mark_node)
5580 init_code = build2 (INIT_EXPR, type, decl, init);
5583 init_code = add_stmt_to_compound (extra_init, init_code);
5585 if (init_code && DECL_IN_AGGR_P (decl))
5587 static int explained = 0;
5589 if (cxx_dialect < cxx0x)
5590 error ("initializer invalid for static member with constructor");
5592 error ("non-constant in-class initialization invalid for static "
5593 "member %qD", decl);
5596 error ("(an out of class initialization is required)");
5604 /* If DECL is not a local variable, give it RTL. */
5607 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5609 int toplev = toplevel_bindings_p ();
5611 const char *filename;
5613 /* Set the DECL_ASSEMBLER_NAME for the object. */
5616 /* The `register' keyword, when used together with an
5617 asm-specification, indicates that the variable should be
5618 placed in a particular register. */
5619 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5621 set_user_assembler_name (decl, asmspec);
5622 DECL_HARD_REGISTER (decl) = 1;
5626 if (TREE_CODE (decl) == FUNCTION_DECL
5627 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5628 set_builtin_user_assembler_name (decl, asmspec);
5629 set_user_assembler_name (decl, asmspec);
5633 /* Handle non-variables up front. */
5634 if (TREE_CODE (decl) != VAR_DECL)
5636 rest_of_decl_compilation (decl, toplev, at_eof);
5640 /* If we see a class member here, it should be a static data
5642 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5644 gcc_assert (TREE_STATIC (decl));
5645 /* An in-class declaration of a static data member should be
5646 external; it is only a declaration, and not a definition. */
5647 if (init == NULL_TREE)
5648 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5651 /* We don't create any RTL for local variables. */
5652 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5655 /* We defer emission of local statics until the corresponding
5656 DECL_EXPR is expanded. */
5657 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5659 /* We try to defer namespace-scope static constants so that they are
5660 not emitted into the object file unnecessarily. */
5661 filename = input_filename;
5662 if (!DECL_VIRTUAL_P (decl)
5663 && TREE_READONLY (decl)
5664 && DECL_INITIAL (decl) != NULL_TREE
5665 && DECL_INITIAL (decl) != error_mark_node
5667 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5669 && !TREE_PUBLIC (decl))
5671 /* Fool with the linkage of static consts according to #pragma
5673 struct c_fileinfo *finfo = get_fileinfo (filename);
5674 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5676 TREE_PUBLIC (decl) = 1;
5677 DECL_EXTERNAL (decl) = finfo->interface_only;
5682 /* Likewise for template instantiations. */
5683 else if (DECL_LANG_SPECIFIC (decl)
5684 && DECL_IMPLICIT_INSTANTIATION (decl))
5687 /* If we're not deferring, go ahead and assemble the variable. */
5689 rest_of_decl_compilation (decl, toplev, at_eof);
5692 /* walk_tree helper for wrap_temporary_cleanups, below. */
5695 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5697 /* Stop at types or full-expression boundaries. */
5698 if (TYPE_P (*stmt_p)
5699 || TREE_CODE (*stmt_p) == CLEANUP_POINT_EXPR)
5705 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5707 tree guard = (tree)data;
5708 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5710 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5711 /* Tell honor_protect_cleanup_actions to handle this as a separate
5713 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5715 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5721 /* We're initializing a local variable which has a cleanup GUARD. If there
5722 are any temporaries used in the initializer INIT of this variable, we
5723 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5724 variable will be cleaned up properly if one of them throws.
5726 Unfortunately, there's no way to express this properly in terms of
5727 nesting, as the regions for the temporaries overlap the region for the
5728 variable itself; if there are two temporaries, the variable needs to be
5729 the first thing destroyed if either of them throws. However, we only
5730 want to run the variable's cleanup if it actually got constructed. So
5731 we need to guard the temporary cleanups with the variable's cleanup if
5732 they are run on the normal path, but not if they are run on the
5733 exceptional path. We implement this by telling
5734 honor_protect_cleanup_actions to strip the variable cleanup from the
5735 exceptional path. */
5738 wrap_temporary_cleanups (tree init, tree guard)
5740 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5743 /* Generate code to initialize DECL (a local variable). */
5746 initialize_local_var (tree decl, tree init)
5748 tree type = TREE_TYPE (decl);
5752 gcc_assert (TREE_CODE (decl) == VAR_DECL
5753 || TREE_CODE (decl) == RESULT_DECL);
5754 gcc_assert (!TREE_STATIC (decl));
5756 if (DECL_SIZE (decl) == NULL_TREE)
5758 /* If we used it already as memory, it must stay in memory. */
5759 DECL_INITIAL (decl) = NULL_TREE;
5760 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5764 if (type == error_mark_node)
5767 /* Compute and store the initial value. */
5768 already_used = TREE_USED (decl) || TREE_USED (type);
5769 if (TREE_USED (type))
5770 DECL_READ_P (decl) = 1;
5772 /* Generate a cleanup, if necessary. */
5773 cleanup = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
5775 /* Perform the initialization. */
5778 if (TREE_CODE (init) == INIT_EXPR
5779 && !TREE_SIDE_EFFECTS (TREE_OPERAND (init, 1)))
5781 /* Stick simple initializers in DECL_INITIAL so that
5782 -Wno-init-self works (c++/34772). */
5783 gcc_assert (TREE_OPERAND (init, 0) == decl);
5784 DECL_INITIAL (decl) = TREE_OPERAND (init, 1);
5788 int saved_stmts_are_full_exprs_p;
5790 /* If we're only initializing a single object, guard the
5791 destructors of any temporaries used in its initializer with
5792 its destructor. This isn't right for arrays because each
5793 element initialization is a full-expression. */
5794 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5795 wrap_temporary_cleanups (init, cleanup);
5797 gcc_assert (building_stmt_list_p ());
5798 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5799 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5800 finish_expr_stmt (init);
5801 current_stmt_tree ()->stmts_are_full_exprs_p =
5802 saved_stmts_are_full_exprs_p;
5806 /* Set this to 0 so we can tell whether an aggregate which was
5807 initialized was ever used. Don't do this if it has a
5808 destructor, so we don't complain about the 'resource
5809 allocation is initialization' idiom. Now set
5810 attribute((unused)) on types so decls of that type will be
5811 marked used. (see TREE_USED, above.) */
5812 if (TYPE_NEEDS_CONSTRUCTING (type)
5814 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5815 && DECL_NAME (decl))
5816 TREE_USED (decl) = 0;
5817 else if (already_used)
5818 TREE_USED (decl) = 1;
5821 finish_decl_cleanup (decl, cleanup);
5824 /* DECL is a VAR_DECL for a compiler-generated variable with static
5825 storage duration (like a virtual table) whose initializer is a
5826 compile-time constant. Initialize the variable and provide it to the
5830 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5833 gcc_assert (DECL_ARTIFICIAL (decl));
5834 init = build_constructor (TREE_TYPE (decl), v);
5835 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5836 DECL_INITIAL (decl) = init;
5837 DECL_INITIALIZED_P (decl) = 1;
5838 determine_visibility (decl);
5839 layout_var_decl (decl);
5840 maybe_commonize_var (decl);
5841 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5844 /* INIT is the initializer for a variable, as represented by the
5845 parser. Returns true iff INIT is type-dependent. */
5848 type_dependent_init_p (tree init)
5850 if (TREE_CODE (init) == TREE_LIST)
5851 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5852 return any_type_dependent_elements_p (init);
5853 else if (TREE_CODE (init) == CONSTRUCTOR)
5854 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5856 VEC(constructor_elt, gc) *elts;
5860 elts = CONSTRUCTOR_ELTS (init);
5861 nelts = VEC_length (constructor_elt, elts);
5862 for (i = 0; i < nelts; ++i)
5863 if (type_dependent_init_p (VEC_index (constructor_elt,
5868 /* It must be a simple expression, e.g., int i = 3; */
5869 return type_dependent_expression_p (init);
5874 /* INIT is the initializer for a variable, as represented by the
5875 parser. Returns true iff INIT is value-dependent. */
5878 value_dependent_init_p (tree init)
5880 if (TREE_CODE (init) == TREE_LIST)
5881 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5882 return any_value_dependent_elements_p (init);
5883 else if (TREE_CODE (init) == CONSTRUCTOR)
5884 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5886 VEC(constructor_elt, gc) *elts;
5890 elts = CONSTRUCTOR_ELTS (init);
5891 nelts = VEC_length (constructor_elt, elts);
5892 for (i = 0; i < nelts; ++i)
5893 if (value_dependent_init_p (VEC_index (constructor_elt,
5898 /* It must be a simple expression, e.g., int i = 3; */
5899 return value_dependent_expression_p (init);
5904 /* Finish processing of a declaration;
5905 install its line number and initial value.
5906 If the length of an array type is not known before,
5907 it must be determined now, from the initial value, or it is an error.
5909 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5910 true, then INIT is an integral constant expression.
5912 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5913 if the (init) syntax was used. */
5916 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5917 tree asmspec_tree, int flags)
5920 VEC(tree,gc) *cleanups = NULL;
5921 const char *asmspec = NULL;
5922 int was_readonly = 0;
5923 bool var_definition_p = false;
5926 if (decl == error_mark_node)
5931 error ("assignment (not initialization) in declaration");
5935 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5936 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5937 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5939 type = TREE_TYPE (decl);
5940 if (type == error_mark_node)
5943 /* If a name was specified, get the string. */
5944 if (at_namespace_scope_p ())
5945 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5946 if (asmspec_tree && asmspec_tree != error_mark_node)
5947 asmspec = TREE_STRING_POINTER (asmspec_tree);
5949 if (current_class_type
5950 && CP_DECL_CONTEXT (decl) == current_class_type
5951 && TYPE_BEING_DEFINED (current_class_type)
5952 && !CLASSTYPE_TEMPLATE_INSTANTIATION (current_class_type)
5953 && (DECL_INITIAL (decl) || init))
5954 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5956 auto_node = type_uses_auto (type);
5960 if (init == NULL_TREE)
5962 error ("declaration of %q#D has no initializer", decl);
5963 TREE_TYPE (decl) = error_mark_node;
5967 if (TREE_CODE (d_init) == TREE_LIST)
5968 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5969 tf_warning_or_error);
5970 d_init = resolve_nondeduced_context (d_init);
5971 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5973 if (type == error_mark_node)
5977 if (!ensure_literal_type_for_constexpr_object (decl))
5978 DECL_DECLARED_CONSTEXPR_P (decl) = 0;
5980 if (TREE_CODE (decl) == VAR_DECL
5981 && DECL_CLASS_SCOPE_P (decl)
5982 && DECL_INITIALIZED_IN_CLASS_P (decl))
5983 check_static_variable_definition (decl, type);
5985 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5988 if (init == ridpointers[(int)RID_DELETE])
5990 /* FIXME check this is 1st decl. */
5991 DECL_DELETED_FN (decl) = 1;
5992 DECL_DECLARED_INLINE_P (decl) = 1;
5993 DECL_INITIAL (decl) = error_mark_node;
5994 FOR_EACH_CLONE (clone, decl)
5996 DECL_DELETED_FN (clone) = 1;
5997 DECL_DECLARED_INLINE_P (clone) = 1;
5998 DECL_INITIAL (clone) = error_mark_node;
6002 else if (init == ridpointers[(int)RID_DEFAULT])
6004 if (defaultable_fn_check (decl))
6005 DECL_DEFAULTED_FN (decl) = 1;
6007 DECL_INITIAL (decl) = NULL_TREE;
6011 if (init && TREE_CODE (decl) == VAR_DECL)
6013 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
6014 /* If DECL is a reference, then we want to know whether init is a
6015 reference constant; init_const_expr_p as passed tells us whether
6016 it's an rvalue constant. */
6017 if (TREE_CODE (type) == REFERENCE_TYPE)
6018 init_const_expr_p = potential_constant_expression (init);
6019 if (init_const_expr_p)
6021 /* Set these flags now for templates. We'll update the flags in
6022 store_init_value for instantiations. */
6023 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
6024 if (decl_maybe_constant_var_p (decl))
6025 TREE_CONSTANT (decl) = 1;
6029 if (processing_template_decl)
6031 bool type_dependent_p;
6033 /* Add this declaration to the statement-tree. */
6034 if (at_function_scope_p ())
6035 add_decl_expr (decl);
6037 type_dependent_p = dependent_type_p (type);
6039 if (check_for_bare_parameter_packs (init))
6042 DECL_INITIAL (decl) = NULL_TREE;
6045 /* Generally, initializers in templates are expanded when the
6046 template is instantiated. But, if DECL is a variable constant
6047 then it can be used in future constant expressions, so its value
6048 must be available. */
6050 if (TREE_CODE (decl) != VAR_DECL || dependent_type_p (type))
6051 /* We can't do anything if the decl has dependent type. */;
6053 && init_const_expr_p
6054 && !type_dependent_p
6055 && decl_maybe_constant_var_p (decl)
6056 && !type_dependent_init_p (init)
6057 && !value_dependent_init_p (init))
6059 /* This variable seems to be a non-dependent constant, so process
6060 its initializer. If check_initializer returns non-null the
6061 initialization wasn't constant after all. */
6063 cleanups = make_tree_vector ();
6064 init_code = check_initializer (decl, init, flags, &cleanups);
6065 if (init_code == NULL_TREE)
6067 release_tree_vector (cleanups);
6069 else if (!DECL_PRETTY_FUNCTION_P (decl))
6070 /* Deduce array size even if the initializer is dependent. */
6071 maybe_deduce_size_from_array_init (decl, init);
6074 DECL_INITIAL (decl) = init;
6078 /* Just store non-static data member initializers for later. */
6079 if (init && TREE_CODE (decl) == FIELD_DECL)
6080 DECL_INITIAL (decl) = init;
6082 /* Take care of TYPE_DECLs up front. */
6083 if (TREE_CODE (decl) == TYPE_DECL)
6085 if (type != error_mark_node
6086 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
6088 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
6089 warning (0, "shadowing previous type declaration of %q#D", decl);
6090 set_identifier_type_value (DECL_NAME (decl), decl);
6093 /* If we have installed this as the canonical typedef for this
6094 type, and that type has not been defined yet, delay emitting
6095 the debug information for it, as we will emit it later. */
6096 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
6097 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
6098 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
6100 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
6105 /* A reference will be modified here, as it is initialized. */
6106 if (! DECL_EXTERNAL (decl)
6107 && TREE_READONLY (decl)
6108 && TREE_CODE (type) == REFERENCE_TYPE)
6111 TREE_READONLY (decl) = 0;
6114 if (TREE_CODE (decl) == VAR_DECL)
6116 /* Only variables with trivial initialization and destruction can
6117 have thread-local storage. */
6118 if (DECL_THREAD_LOCAL_P (decl)
6119 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
6120 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
6121 error ("%qD cannot be thread-local because it has non-trivial "
6122 "type %qT", decl, TREE_TYPE (decl));
6123 /* If this is a local variable that will need a mangled name,
6124 register it now. We must do this before processing the
6125 initializer for the variable, since the initialization might
6126 require a guard variable, and since the mangled name of the
6127 guard variable will depend on the mangled name of this
6129 if (DECL_FUNCTION_SCOPE_P (decl)
6130 && TREE_STATIC (decl)
6131 && !DECL_ARTIFICIAL (decl))
6133 push_local_name (decl);
6134 if (DECL_CONSTRUCTOR_P (current_function_decl)
6135 || DECL_DESTRUCTOR_P (current_function_decl))
6136 /* Normally local_decls is populated during GIMPLE lowering,
6137 but [cd]tors are never actually compiled directly. We need
6138 to put statics on the list so we can deal with the label
6139 address extension. */
6140 add_local_decl (cfun, decl);
6143 /* Convert the initializer to the type of DECL, if we have not
6144 already initialized DECL. */
6145 if (!DECL_INITIALIZED_P (decl)
6146 /* If !DECL_EXTERNAL then DECL is being defined. In the
6147 case of a static data member initialized inside the
6148 class-specifier, there can be an initializer even if DECL
6149 is *not* defined. */
6150 && (!DECL_EXTERNAL (decl) || init))
6152 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6155 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
6156 /* Allow libjava/prims.cc define primitive classes. */
6157 if (init != NULL_TREE
6158 || jclass == NULL_TREE
6159 || TREE_CODE (jclass) != TYPE_DECL
6160 || !POINTER_TYPE_P (TREE_TYPE (jclass))
6161 || !same_type_ignoring_top_level_qualifiers_p
6162 (type, TREE_TYPE (TREE_TYPE (jclass))))
6163 error ("Java object %qD not allocated with %<new%>", decl);
6166 cleanups = make_tree_vector ();
6167 init = check_initializer (decl, init, flags, &cleanups);
6168 /* Thread-local storage cannot be dynamically initialized. */
6169 if (DECL_THREAD_LOCAL_P (decl) && init)
6171 error ("%qD is thread-local and so cannot be dynamically "
6172 "initialized", decl);
6176 /* Check that the initializer for a static data member was a
6177 constant. Although we check in the parser that the
6178 initializer is an integral constant expression, we do not
6179 simplify division-by-zero at the point at which it
6180 occurs. Therefore, in:
6182 struct S { static const int i = 7 / 0; };
6184 we issue an error at this point. It would
6185 probably be better to forbid division by zero in
6186 integral constant expressions. */
6187 if (DECL_EXTERNAL (decl) && init)
6189 error ("%qD cannot be initialized by a non-constant expression"
6190 " when being declared", decl);
6191 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
6199 The memory occupied by any object of static storage
6200 duration is zero-initialized at program startup before
6201 any other initialization takes place.
6203 We cannot create an appropriate initializer until after
6204 the type of DECL is finalized. If DECL_INITIAL is set,
6205 then the DECL is statically initialized, and any
6206 necessary zero-initialization has already been performed. */
6207 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
6208 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
6209 /*nelts=*/NULL_TREE,
6210 /*static_storage_p=*/true);
6211 /* Remember that the initialization for this variable has
6213 DECL_INITIALIZED_P (decl) = 1;
6214 /* This declaration is the definition of this variable,
6215 unless we are initializing a static data member within
6216 the class specifier. */
6217 if (!DECL_EXTERNAL (decl))
6218 var_definition_p = true;
6220 /* If the variable has an array type, lay out the type, even if
6221 there is no initializer. It is valid to index through the
6222 array, and we must get TYPE_ALIGN set correctly on the array
6224 else if (TREE_CODE (type) == ARRAY_TYPE)
6227 if (TREE_STATIC (decl)
6228 && !at_function_scope_p ()
6229 && current_function_decl == NULL)
6230 /* So decl is a global variable or a static member of a
6231 non local class. Record the types it uses
6232 so that we can decide later to emit debug info for them. */
6233 record_types_used_by_current_var_decl (decl);
6235 else if (TREE_CODE (decl) == FIELD_DECL
6236 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
6237 error ("non-static data member %qD has Java class type", decl);
6239 /* Add this declaration to the statement-tree. This needs to happen
6240 after the call to check_initializer so that the DECL_EXPR for a
6241 reference temp is added before the DECL_EXPR for the reference itself. */
6242 if (DECL_FUNCTION_SCOPE_P (decl))
6243 add_decl_expr (decl);
6245 /* Let the middle end know about variables and functions -- but not
6246 static data members in uninstantiated class templates. */
6247 if (TREE_CODE (decl) == VAR_DECL
6248 || TREE_CODE (decl) == FUNCTION_DECL)
6250 if (TREE_CODE (decl) == VAR_DECL)
6252 layout_var_decl (decl);
6253 maybe_commonize_var (decl);
6256 /* This needs to happen after the linkage is set. */
6257 determine_visibility (decl);
6259 if (var_definition_p && TREE_STATIC (decl))
6261 /* If a TREE_READONLY variable needs initialization
6262 at runtime, it is no longer readonly and we need to
6263 avoid MEM_READONLY_P being set on RTL created for it. */
6266 if (TREE_READONLY (decl))
6267 TREE_READONLY (decl) = 0;
6270 else if (was_readonly)
6271 TREE_READONLY (decl) = 1;
6274 make_rtl_for_nonlocal_decl (decl, init, asmspec);
6276 /* Check for abstractness of the type. Notice that there is no
6277 need to strip array types here since the check for those types
6278 is already done within create_array_type_for_decl. */
6279 if (TREE_CODE (type) == FUNCTION_TYPE
6280 || TREE_CODE (type) == METHOD_TYPE)
6281 abstract_virtuals_error (decl, TREE_TYPE (type));
6283 abstract_virtuals_error (decl, type);
6285 if (TREE_TYPE (decl) == error_mark_node)
6286 /* No initialization required. */
6288 else if (TREE_CODE (decl) == FUNCTION_DECL)
6292 if (init == ridpointers[(int)RID_DEFAULT])
6294 /* An out-of-class default definition is defined at
6295 the point where it is explicitly defaulted. */
6296 if (DECL_DELETED_FN (decl))
6297 maybe_explain_implicit_delete (decl);
6298 else if (DECL_INITIAL (decl) == error_mark_node)
6299 synthesize_method (decl);
6302 error ("function %q#D is initialized like a variable", decl);
6304 /* else no initialization required. */
6306 else if (DECL_EXTERNAL (decl)
6307 && ! (DECL_LANG_SPECIFIC (decl)
6308 && DECL_NOT_REALLY_EXTERN (decl)))
6311 DECL_INITIAL (decl) = init;
6313 /* A variable definition. */
6314 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6315 /* Initialize the local variable. */
6316 initialize_local_var (decl, init);
6318 /* If a variable is defined, and then a subsequent
6319 definition with external linkage is encountered, we will
6320 get here twice for the same variable. We want to avoid
6321 calling expand_static_init more than once. For variables
6322 that are not static data members, we can call
6323 expand_static_init only when we actually process the
6324 initializer. It is not legal to redeclare a static data
6325 member, so this issue does not arise in that case. */
6326 else if (var_definition_p && TREE_STATIC (decl))
6327 expand_static_init (decl, init);
6330 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6331 reference, insert it in the statement-tree now. */
6335 FOR_EACH_VEC_ELT (tree, cleanups, i, t)
6336 push_cleanup (decl, t, false);
6337 release_tree_vector (cleanups);
6341 TREE_READONLY (decl) = 1;
6343 invoke_plugin_callbacks (PLUGIN_FINISH_DECL, decl);
6346 /* Returns a declaration for a VAR_DECL as if:
6348 extern "C" TYPE NAME;
6350 had been seen. Used to create compiler-generated global
6354 declare_global_var (tree name, tree type)
6358 push_to_top_level ();
6359 decl = build_decl (input_location, VAR_DECL, name, type);
6360 TREE_PUBLIC (decl) = 1;
6361 DECL_EXTERNAL (decl) = 1;
6362 DECL_ARTIFICIAL (decl) = 1;
6363 /* If the user has explicitly declared this variable (perhaps
6364 because the code we are compiling is part of a low-level runtime
6365 library), then it is possible that our declaration will be merged
6366 with theirs by pushdecl. */
6367 decl = pushdecl (decl);
6368 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6369 pop_from_top_level ();
6374 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6375 if "__cxa_atexit" is not being used) corresponding to the function
6376 to be called when the program exits. */
6379 get_atexit_fn_ptr_type (void)
6383 if (!atexit_fn_ptr_type_node)
6386 if (flag_use_cxa_atexit
6387 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6388 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6389 arg_type = ptr_type_node;
6391 /* The parameter to "atexit" is "void (*)(void)". */
6392 arg_type = NULL_TREE;
6394 fn_type = build_function_type_list (void_type_node,
6395 arg_type, NULL_TREE);
6396 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6399 return atexit_fn_ptr_type_node;
6402 /* Returns a pointer to the `atexit' function. Note that if
6403 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6404 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6407 get_atexit_node (void)
6413 bool use_aeabi_atexit;
6418 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6420 /* The declaration for `__cxa_atexit' is:
6422 int __cxa_atexit (void (*)(void *), void *, void *)
6424 We build up the argument types and then the function type
6426 tree argtype0, argtype1, argtype2;
6428 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6429 /* First, build the pointer-to-function type for the first
6431 fn_ptr_type = get_atexit_fn_ptr_type ();
6432 /* Then, build the rest of the argument types. */
6433 argtype2 = ptr_type_node;
6434 if (use_aeabi_atexit)
6436 argtype1 = fn_ptr_type;
6437 argtype0 = ptr_type_node;
6441 argtype1 = ptr_type_node;
6442 argtype0 = fn_ptr_type;
6444 /* And the final __cxa_atexit type. */
6445 fn_type = build_function_type_list (integer_type_node,
6446 argtype0, argtype1, argtype2,
6448 fn_ptr_type = build_pointer_type (fn_type);
6449 if (use_aeabi_atexit)
6450 name = "__aeabi_atexit";
6452 name = "__cxa_atexit";
6456 /* The declaration for `atexit' is:
6458 int atexit (void (*)());
6460 We build up the argument types and then the function type
6462 fn_ptr_type = get_atexit_fn_ptr_type ();
6463 /* Build the final atexit type. */
6464 fn_type = build_function_type_list (integer_type_node,
6465 fn_ptr_type, NULL_TREE);
6469 /* Now, build the function declaration. */
6470 push_lang_context (lang_name_c);
6471 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6472 mark_used (atexit_fndecl);
6473 pop_lang_context ();
6474 atexit_node = decay_conversion (atexit_fndecl);
6479 /* Returns the __dso_handle VAR_DECL. */
6482 get_dso_handle_node (void)
6484 if (dso_handle_node)
6485 return dso_handle_node;
6487 /* Declare the variable. */
6488 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6491 #ifdef HAVE_GAS_HIDDEN
6492 DECL_VISIBILITY (dso_handle_node) = VISIBILITY_HIDDEN;
6493 DECL_VISIBILITY_SPECIFIED (dso_handle_node) = 1;
6496 return dso_handle_node;
6499 /* Begin a new function with internal linkage whose job will be simply
6500 to destroy some particular variable. */
6502 static GTY(()) int start_cleanup_cnt;
6505 start_cleanup_fn (void)
6510 bool use_cxa_atexit = flag_use_cxa_atexit
6511 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6513 push_to_top_level ();
6515 /* No need to mangle this. */
6516 push_lang_context (lang_name_c);
6518 /* Build the name of the function. */
6519 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6520 /* Build the function declaration. */
6521 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6522 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6523 /* It's a function with internal linkage, generated by the
6525 TREE_PUBLIC (fndecl) = 0;
6526 DECL_ARTIFICIAL (fndecl) = 1;
6527 /* Make the function `inline' so that it is only emitted if it is
6528 actually needed. It is unlikely that it will be inlined, since
6529 it is only called via a function pointer, but we avoid unnecessary
6530 emissions this way. */
6531 DECL_DECLARED_INLINE_P (fndecl) = 1;
6532 DECL_INTERFACE_KNOWN (fndecl) = 1;
6533 /* Build the parameter. */
6538 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6539 DECL_CONTEXT (parmdecl) = fndecl;
6540 TREE_USED (parmdecl) = 1;
6541 DECL_READ_P (parmdecl) = 1;
6542 DECL_ARGUMENTS (fndecl) = parmdecl;
6546 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6548 pop_lang_context ();
6550 return current_function_decl;
6553 /* Finish the cleanup function begun by start_cleanup_fn. */
6556 end_cleanup_fn (void)
6558 expand_or_defer_fn (finish_function (0));
6560 pop_from_top_level ();
6563 /* Generate code to handle the destruction of DECL, an object with
6564 static storage duration. */
6567 register_dtor_fn (tree decl)
6574 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6576 type = TREE_TYPE (decl);
6577 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6578 return void_zero_node;
6580 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6581 a class object, we can just pass the destructor to
6582 "__cxa_atexit"; we don't have to build a temporary function to do
6584 use_dtor = (flag_use_cxa_atexit
6585 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6586 && CLASS_TYPE_P (type));
6591 /* Find the destructor. */
6592 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6593 gcc_assert (idx >= 0);
6594 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6595 /* Make sure it is accessible. */
6596 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6600 /* Call build_cleanup before we enter the anonymous function so
6601 that any access checks will be done relative to the current
6602 scope, rather than the scope of the anonymous function. */
6603 build_cleanup (decl);
6605 /* Now start the function. */
6606 cleanup = start_cleanup_fn ();
6608 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6609 to the original function, rather than the anonymous one. That
6610 will make the back end think that nested functions are in use,
6611 which causes confusion. */
6612 push_deferring_access_checks (dk_no_check);
6613 fcall = build_cleanup (decl);
6614 pop_deferring_access_checks ();
6616 /* Create the body of the anonymous function. */
6617 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6618 finish_expr_stmt (fcall);
6619 finish_compound_stmt (compound_stmt);
6623 /* Call atexit with the cleanup function. */
6624 mark_used (cleanup);
6625 cleanup = build_address (cleanup);
6626 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6632 /* We must convert CLEANUP to the type that "__cxa_atexit"
6634 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6635 /* "__cxa_atexit" will pass the address of DECL to the
6636 cleanup function. */
6638 addr = build_address (decl);
6639 /* The declared type of the parameter to "__cxa_atexit" is
6640 "void *". For plain "T*", we could just let the
6641 machinery in cp_build_function_call convert it -- but if the
6642 type is "cv-qualified T *", then we need to convert it
6643 before passing it in, to avoid spurious errors. */
6644 addr = build_nop (ptr_type_node, addr);
6647 /* Since the cleanup functions we build ignore the address
6648 they're given, there's no reason to pass the actual address
6649 in, and, in general, it's cheaper to pass NULL than any
6651 addr = null_pointer_node;
6652 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6653 tf_warning_or_error);
6654 if (targetm.cxx.use_aeabi_atexit ())
6667 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6668 arg0, arg1, arg2, NULL_TREE);
6671 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6672 is its initializer. Generate code to handle the construction
6673 and destruction of DECL. */
6676 expand_static_init (tree decl, tree init)
6678 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6679 gcc_assert (TREE_STATIC (decl));
6681 /* Some variables require no dynamic initialization. */
6683 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6686 if (DECL_FUNCTION_SCOPE_P (decl))
6688 /* Emit code to perform this initialization but once. */
6689 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6690 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6691 tree guard, guard_addr;
6694 /* Emit code to perform this initialization but once. This code
6697 static <type> guard;
6698 if (!guard.first_byte) {
6699 if (__cxa_guard_acquire (&guard)) {
6702 // Do initialization.
6703 flag = true; __cxa_guard_release (&guard);
6704 // Register variable for destruction at end of program.
6706 if (!flag) __cxa_guard_abort (&guard);
6710 Note that the `flag' variable is only set to 1 *after* the
6711 initialization is complete. This ensures that an exception,
6712 thrown during the construction, will cause the variable to
6713 reinitialized when we pass through this code again, as per:
6717 If the initialization exits by throwing an exception, the
6718 initialization is not complete, so it will be tried again
6719 the next time control enters the declaration.
6721 This process should be thread-safe, too; multiple threads
6722 should not be able to initialize the variable more than
6725 /* Create the guard variable. */
6726 guard = get_guard (decl);
6728 /* This optimization isn't safe on targets with relaxed memory
6729 consistency. On such targets we force synchronization in
6730 __cxa_guard_acquire. */
6731 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6733 /* Begin the conditional initialization. */
6734 if_stmt = begin_if_stmt ();
6735 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6736 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6739 if (flag_threadsafe_statics)
6741 tree vfntype = NULL_TREE;
6742 tree acquire_name, release_name, abort_name;
6743 tree acquire_fn, release_fn, abort_fn;
6744 guard_addr = build_address (guard);
6746 acquire_name = get_identifier ("__cxa_guard_acquire");
6747 release_name = get_identifier ("__cxa_guard_release");
6748 abort_name = get_identifier ("__cxa_guard_abort");
6749 acquire_fn = identifier_global_value (acquire_name);
6750 release_fn = identifier_global_value (release_name);
6751 abort_fn = identifier_global_value (abort_name);
6753 acquire_fn = push_library_fn
6754 (acquire_name, build_function_type_list (integer_type_node,
6755 TREE_TYPE (guard_addr),
6758 if (!release_fn || !abort_fn)
6759 vfntype = build_function_type_list (void_type_node,
6760 TREE_TYPE (guard_addr),
6763 release_fn = push_library_fn (release_name, vfntype, NULL_TREE);
6765 abort_fn = push_library_fn (abort_name, vfntype, NULL_TREE);
6767 inner_if_stmt = begin_if_stmt ();
6768 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6771 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6772 begin = get_target_expr (boolean_false_node);
6773 flag = TARGET_EXPR_SLOT (begin);
6775 TARGET_EXPR_CLEANUP (begin)
6776 = build3 (COND_EXPR, void_type_node, flag,
6778 build_call_n (abort_fn, 1, guard_addr));
6779 CLEANUP_EH_ONLY (begin) = 1;
6781 /* Do the initialization itself. */
6782 init = add_stmt_to_compound (begin, init);
6783 init = add_stmt_to_compound
6784 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6785 init = add_stmt_to_compound
6786 (init, build_call_n (release_fn, 1, guard_addr));
6789 init = add_stmt_to_compound (init, set_guard (guard));
6791 /* Use atexit to register a function for destroying this static
6793 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6795 finish_expr_stmt (init);
6797 if (flag_threadsafe_statics)
6799 finish_compound_stmt (inner_then_clause);
6800 finish_then_clause (inner_if_stmt);
6801 finish_if_stmt (inner_if_stmt);
6804 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6806 finish_compound_stmt (then_clause);
6807 finish_then_clause (if_stmt);
6808 finish_if_stmt (if_stmt);
6812 static_aggregates = tree_cons (init, decl, static_aggregates);
6816 /* Make TYPE a complete type based on INITIAL_VALUE.
6817 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6818 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6819 3 if the initializer list is empty (in pedantic mode). */
6822 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6825 tree type, elt_type;
6829 unsigned HOST_WIDE_INT i;
6832 /* An array of character type can be initialized from a
6833 brace-enclosed string constant.
6835 FIXME: this code is duplicated from reshape_init. Probably
6836 we should just call reshape_init here? */
6837 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6838 && TREE_CODE (initial_value) == CONSTRUCTOR
6839 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6841 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6842 tree value = VEC_index (constructor_elt, v, 0)->value;
6844 if (TREE_CODE (value) == STRING_CST
6845 && VEC_length (constructor_elt, v) == 1)
6846 initial_value = value;
6849 /* If any of the elements are parameter packs, we can't actually
6850 complete this type now because the array size is dependent. */
6851 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6853 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6856 if (PACK_EXPANSION_P (value))
6862 failure = complete_array_type (ptype, initial_value, do_default);
6864 /* We can create the array before the element type is complete, which
6865 means that we didn't have these two bits set in the original type
6866 either. In completing the type, we are expected to propagate these
6867 bits. See also complete_type which does the same thing for arrays
6870 if (TYPE_DOMAIN (type))
6872 elt_type = TREE_TYPE (type);
6873 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6874 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6875 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6881 /* As above, but either give an error or reject zero-size arrays, depending
6885 cp_complete_array_type_or_error (tree *ptype, tree initial_value,
6886 bool do_default, tsubst_flags_t complain)
6889 bool sfinae = !(complain & tf_error);
6890 /* In SFINAE context we can't be lenient about zero-size arrays. */
6893 failure = cp_complete_array_type (ptype, initial_value, do_default);
6899 /* Not an error. */;
6900 else if (failure == 1)
6901 error ("initializer fails to determine size of %qT", *ptype);
6902 else if (failure == 2)
6905 error ("array size missing in %qT", *ptype);
6907 else if (failure == 3)
6908 error ("zero-size array %qT", *ptype);
6909 *ptype = error_mark_node;
6914 /* Return zero if something is declared to be a member of type
6915 CTYPE when in the context of CUR_TYPE. STRING is the error
6916 message to print in that case. Otherwise, quietly return 1. */
6919 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6921 if (ctype && ctype != cur_type)
6923 if (flags == DTOR_FLAG)
6924 error ("destructor for alien class %qT cannot be a member", ctype);
6926 error ("constructor for alien class %qT cannot be a member", ctype);
6932 /* Subroutine of `grokdeclarator'. */
6934 /* Generate errors possibly applicable for a given set of specifiers.
6935 This is for ARM $7.1.2. */
6938 bad_specifiers (tree object,
6939 enum bad_spec_place type,
6950 error ("%qD declared as a %<virtual%> variable", object);
6952 error ("%qD declared as an %<inline%> variable", object);
6954 error ("%<const%> and %<volatile%> function specifiers on "
6955 "%qD invalid in variable declaration", object);
6959 error ("%qD declared as a %<virtual%> parameter", object);
6961 error ("%qD declared as an %<inline%> parameter", object);
6963 error ("%<const%> and %<volatile%> function specifiers on "
6964 "%qD invalid in parameter declaration", object);
6968 error ("%qD declared as a %<virtual%> type", object);
6970 error ("%qD declared as an %<inline%> type", object);
6972 error ("%<const%> and %<volatile%> function specifiers on "
6973 "%qD invalid in type declaration", object);
6977 error ("%qD declared as a %<virtual%> field", object);
6979 error ("%qD declared as an %<inline%> field", object);
6981 error ("%<const%> and %<volatile%> function specifiers on "
6982 "%qD invalid in field declaration", object);
6988 error ("%q+D declared as a friend", object);
6990 && (TREE_CODE (object) == TYPE_DECL
6991 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6992 && !TYPE_REFFN_P (TREE_TYPE (object))
6993 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6994 error ("%q+D declared with an exception specification", object);
6997 /* DECL is a member function or static data member and is presently
6998 being defined. Check that the definition is taking place in a
7002 check_class_member_definition_namespace (tree decl)
7004 /* These checks only apply to member functions and static data
7006 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
7007 || TREE_CODE (decl) == VAR_DECL);
7008 /* We check for problems with specializations in pt.c in
7009 check_specialization_namespace, where we can issue better
7011 if (processing_specialization)
7013 /* There are no restrictions on the placement of
7014 explicit instantiations. */
7015 if (processing_explicit_instantiation)
7019 A member function definition that appears outside of the
7020 class definition shall appear in a namespace scope enclosing
7021 the class definition.
7025 The definition for a static data member shall appear in a
7026 namespace scope enclosing the member's class definition. */
7027 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
7028 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
7029 decl, DECL_CONTEXT (decl));
7032 /* Build a PARM_DECL for the "this" parameter. TYPE is the
7033 METHOD_TYPE for a non-static member function; QUALS are the
7034 cv-qualifiers that apply to the function. */
7037 build_this_parm (tree type, cp_cv_quals quals)
7042 cp_cv_quals this_quals;
7044 if (CLASS_TYPE_P (type))
7047 = cp_build_qualified_type (type, quals & ~TYPE_QUAL_RESTRICT);
7048 this_type = build_pointer_type (this_type);
7051 this_type = type_of_this_parm (type);
7052 /* The `this' parameter is implicitly `const'; it cannot be
7054 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
7055 qual_type = cp_build_qualified_type (this_type, this_quals);
7056 parm = build_artificial_parm (this_identifier, qual_type);
7057 cp_apply_type_quals_to_decl (this_quals, parm);
7061 /* DECL is a static member function. Complain if it was declared
7062 with function-cv-quals. */
7065 check_static_quals (tree decl, cp_cv_quals quals)
7067 if (quals != TYPE_UNQUALIFIED)
7068 error ("static member function %q#D declared with type qualifiers",
7072 /* CTYPE is class type, or null if non-class.
7073 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
7075 DECLARATOR is the function's name.
7076 PARMS is a chain of PARM_DECLs for the function.
7077 VIRTUALP is truthvalue of whether the function is virtual or not.
7078 FLAGS are to be passed through to `grokclassfn'.
7079 QUALS are qualifiers indicating whether the function is `const'
7081 RAISES is a list of exceptions that this function can raise.
7082 CHECK is 1 if we must find this method in CTYPE, 0 if we should
7083 not look, and -1 if we should not call `grokclassfn' at all.
7085 SFK is the kind of special function (if any) for the new function.
7087 Returns `NULL_TREE' if something goes wrong, after issuing
7088 applicable error messages. */
7091 grokfndecl (tree ctype,
7095 tree orig_declarator,
7097 enum overload_flags flags,
7104 special_function_kind sfk,
7109 location_t location)
7112 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
7116 type = build_exception_variant (type, raises);
7118 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
7120 /* If we have an explicit location, use it, otherwise use whatever
7121 build_lang_decl used (probably input_location). */
7122 if (location != UNKNOWN_LOCATION)
7123 DECL_SOURCE_LOCATION (decl) = location;
7125 if (TREE_CODE (type) == METHOD_TYPE)
7128 parm = build_this_parm (type, quals);
7129 DECL_CHAIN (parm) = parms;
7132 DECL_ARGUMENTS (decl) = parms;
7133 for (t = parms; t; t = DECL_CHAIN (t))
7134 DECL_CONTEXT (t) = decl;
7135 /* Propagate volatile out from type to decl. */
7136 if (TYPE_VOLATILE (type))
7137 TREE_THIS_VOLATILE (decl) = 1;
7139 /* Setup decl according to sfk. */
7142 case sfk_constructor:
7143 case sfk_copy_constructor:
7144 case sfk_move_constructor:
7145 DECL_CONSTRUCTOR_P (decl) = 1;
7147 case sfk_destructor:
7148 DECL_DESTRUCTOR_P (decl) = 1;
7154 /* If pointers to member functions use the least significant bit to
7155 indicate whether a function is virtual, ensure a pointer
7156 to this function will have that bit clear. */
7157 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
7158 && TREE_CODE (type) == METHOD_TYPE
7159 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
7160 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
7163 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
7167 ("defining explicit specialization %qD in friend declaration",
7171 tree fns = TREE_OPERAND (orig_declarator, 0);
7172 tree args = TREE_OPERAND (orig_declarator, 1);
7174 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
7176 /* Something like `template <class T> friend void f<T>()'. */
7177 error ("invalid use of template-id %qD in declaration "
7178 "of primary template",
7184 /* A friend declaration of the form friend void f<>(). Record
7185 the information in the TEMPLATE_ID_EXPR. */
7186 SET_DECL_IMPLICIT_INSTANTIATION (decl);
7188 if (TREE_CODE (fns) == COMPONENT_REF)
7190 /* Due to bison parser ickiness, we will have already looked
7191 up an operator_name or PFUNCNAME within the current class
7192 (see template_id in parse.y). If the current class contains
7193 such a name, we'll get a COMPONENT_REF here. Undo that. */
7195 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
7196 == current_class_type);
7197 fns = TREE_OPERAND (fns, 1);
7199 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
7200 || TREE_CODE (fns) == OVERLOAD);
7201 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
7203 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
7204 if (TREE_PURPOSE (t)
7205 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
7207 error ("default arguments are not allowed in declaration "
7208 "of friend template specialization %qD",
7215 error ("%<inline%> is not allowed in declaration of friend "
7216 "template specialization %qD",
7223 /* If this decl has namespace scope, set that up. */
7225 set_decl_namespace (decl, in_namespace, friendp);
7227 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
7229 /* `main' and builtins have implicit 'C' linkage. */
7230 if ((MAIN_NAME_P (declarator)
7231 || (IDENTIFIER_LENGTH (declarator) > 10
7232 && IDENTIFIER_POINTER (declarator)[0] == '_'
7233 && IDENTIFIER_POINTER (declarator)[1] == '_'
7234 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
7235 && current_lang_name == lang_name_cplusplus
7236 && ctype == NULL_TREE
7237 && DECL_FILE_SCOPE_P (decl))
7238 SET_DECL_LANGUAGE (decl, lang_c);
7240 /* Should probably propagate const out from type to decl I bet (mrs). */
7243 DECL_STATIC_FUNCTION_P (decl) = 1;
7244 DECL_CONTEXT (decl) = ctype;
7249 DECL_CONTEXT (decl) = ctype;
7251 check_class_member_definition_namespace (decl);
7254 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7256 if (processing_template_decl)
7257 error ("cannot declare %<::main%> to be a template");
7259 error ("cannot declare %<::main%> to be inline");
7261 error ("cannot declare %<::main%> to be static");
7266 /* Members of anonymous types and local classes have no linkage; make
7267 them internal. If a typedef is made later, this will be changed. */
7268 if (ctype && (TYPE_ANONYMOUS_P (ctype)
7269 || decl_function_context (TYPE_MAIN_DECL (ctype))))
7272 if (publicp && cxx_dialect == cxx98)
7274 /* [basic.link]: A name with no linkage (notably, the name of a class
7275 or enumeration declared in a local scope) shall not be used to
7276 declare an entity with linkage.
7278 DR 757 relaxes this restriction for C++0x. */
7279 t = no_linkage_check (TREE_TYPE (decl),
7280 /*relaxed_p=*/false);
7283 if (TYPE_ANONYMOUS_P (t))
7285 if (DECL_EXTERN_C_P (decl))
7286 /* Allow this; it's pretty common in C. */;
7289 permerror (input_location, "anonymous type with no linkage "
7290 "used to declare function %q#D with linkage",
7292 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7293 permerror (input_location, "%q+#D does not refer to the unqualified "
7294 "type, so it is not used for linkage",
7299 permerror (input_location, "type %qT with no linkage used to "
7300 "declare function %q#D with linkage", t, decl);
7304 TREE_PUBLIC (decl) = publicp;
7307 DECL_INTERFACE_KNOWN (decl) = 1;
7308 DECL_NOT_REALLY_EXTERN (decl) = 1;
7311 /* If the declaration was declared inline, mark it as such. */
7313 DECL_DECLARED_INLINE_P (decl) = 1;
7315 DECL_DECLARED_CONSTEXPR_P (decl) = true;
7317 DECL_EXTERNAL (decl) = 1;
7318 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
7321 ? G_("static member function %qD cannot have cv-qualifier")
7322 : G_("non-member function %qD cannot have cv-qualifier"),
7324 quals = TYPE_UNQUALIFIED;
7327 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
7328 && !grok_op_properties (decl, /*complain=*/true))
7330 else if (UDLIT_OPER_P (DECL_NAME (decl)))
7332 bool long_long_unsigned_p;
7334 const char *suffix = NULL;
7335 /* [over.literal]/6: Literal operators shall not have C linkage. */
7336 if (DECL_LANGUAGE (decl) == lang_c)
7338 error ("literal operator with C linkage");
7342 if (DECL_NAMESPACE_SCOPE_P (decl))
7344 if (!check_literal_operator_args (decl, &long_long_unsigned_p,
7347 error ("%qD has invalid argument list", decl);
7351 suffix = UDLIT_OP_SUFFIX (DECL_NAME (decl));
7352 if (long_long_unsigned_p)
7354 if (cpp_interpret_int_suffix (suffix, strlen (suffix)))
7355 warning (0, "integer suffix %<%s%>"
7356 " shadowed by implementation", suffix);
7358 else if (long_double_p)
7360 if (cpp_interpret_float_suffix (suffix, strlen (suffix)))
7361 warning (0, "floating point suffix %<%s%>"
7362 " shadowed by implementation", suffix);
7367 error ("%qD must be a non-member function", decl);
7373 /* Make the init_value nonzero so pushdecl knows this is not
7374 tentative. error_mark_node is replaced later with the BLOCK. */
7375 DECL_INITIAL (decl) = error_mark_node;
7377 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
7378 TREE_NOTHROW (decl) = 1;
7380 /* Caller will do the rest of this. */
7384 if (ctype != NULL_TREE)
7385 grokclassfn (ctype, decl, flags);
7387 decl = check_explicit_specialization (orig_declarator, decl,
7390 4 * (friendp != 0));
7391 if (decl == error_mark_node)
7394 if (DECL_STATIC_FUNCTION_P (decl))
7395 check_static_quals (decl, quals);
7399 cplus_decl_attributes (&decl, *attrlist, 0);
7400 *attrlist = NULL_TREE;
7403 /* Check main's type after attributes have been applied. */
7404 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7406 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7409 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7411 error ("%<::main%> must return %<int%>");
7412 newtype = build_function_type (integer_type_node, oldtypeargs);
7413 TREE_TYPE (decl) = newtype;
7416 check_main_parameter_types (decl);
7419 if (ctype != NULL_TREE
7420 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7423 tree old_decl = check_classfn (ctype, decl,
7424 (processing_template_decl
7425 > template_class_depth (ctype))
7426 ? current_template_parms
7429 if (old_decl == error_mark_node)
7437 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7438 /* Because grokfndecl is always supposed to return a
7439 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7440 here. We depend on our callers to figure out that its
7441 really a template that's being returned. */
7442 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7444 if (DECL_STATIC_FUNCTION_P (old_decl)
7445 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7447 /* Remove the `this' parm added by grokclassfn. */
7448 revert_static_member_fn (decl);
7449 check_static_quals (decl, quals);
7451 if (DECL_ARTIFICIAL (old_decl))
7453 error ("definition of implicitly-declared %qD", old_decl);
7456 else if (DECL_DEFAULTED_FN (old_decl))
7458 error ("definition of explicitly-defaulted %q+D", decl);
7459 error ("%q+#D explicitly defaulted here", old_decl);
7463 /* Since we've smashed OLD_DECL to its
7464 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7465 if (TREE_CODE (decl) == TEMPLATE_DECL)
7466 decl = DECL_TEMPLATE_RESULT (decl);
7468 /* Attempt to merge the declarations. This can fail, in
7469 the case of some invalid specialization declarations. */
7470 pushed_scope = push_scope (ctype);
7471 ok = duplicate_decls (decl, old_decl, friendp);
7473 pop_scope (pushed_scope);
7476 error ("no %q#D member function declared in class %qT",
7484 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7487 if (ctype == NULL_TREE || check)
7491 DECL_VIRTUAL_P (decl) = 1;
7496 /* decl is a FUNCTION_DECL.
7497 specifiers are the parsed virt-specifiers.
7499 Set flags to reflect the virt-specifiers.
7504 set_virt_specifiers (tree decl, cp_virt_specifiers specifiers)
7506 if (decl == NULL_TREE)
7508 if (specifiers & VIRT_SPEC_OVERRIDE)
7509 DECL_OVERRIDE_P (decl) = 1;
7510 if (specifiers & VIRT_SPEC_FINAL)
7511 DECL_FINAL_P (decl) = 1;
7515 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7516 the linkage that DECL will receive in the object file. */
7519 set_linkage_for_static_data_member (tree decl)
7521 /* A static data member always has static storage duration and
7522 external linkage. Note that static data members are forbidden in
7523 local classes -- the only situation in which a class has
7524 non-external linkage. */
7525 TREE_PUBLIC (decl) = 1;
7526 TREE_STATIC (decl) = 1;
7527 /* For non-template classes, static data members are always put
7528 out in exactly those files where they are defined, just as
7529 with ordinary namespace-scope variables. */
7530 if (!processing_template_decl)
7531 DECL_INTERFACE_KNOWN (decl) = 1;
7534 /* Create a VAR_DECL named NAME with the indicated TYPE.
7536 If SCOPE is non-NULL, it is the class type or namespace containing
7537 the variable. If SCOPE is NULL, the variable should is created in
7538 the innermost enclosings scope. */
7541 grokvardecl (tree type,
7543 const cp_decl_specifier_seq *declspecs,
7549 tree explicit_scope;
7551 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7553 /* Compute the scope in which to place the variable, but remember
7554 whether or not that scope was explicitly specified by the user. */
7555 explicit_scope = scope;
7558 /* An explicit "extern" specifier indicates a namespace-scope
7560 if (declspecs->storage_class == sc_extern)
7561 scope = current_decl_namespace ();
7562 else if (!at_function_scope_p ())
7563 scope = current_scope ();
7567 && (/* If the variable is a namespace-scope variable declared in a
7568 template, we need DECL_LANG_SPECIFIC. */
7569 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7570 /* Similarly for namespace-scope variables with language linkage
7572 || (TREE_CODE (scope) == NAMESPACE_DECL
7573 && current_lang_name != lang_name_cplusplus)
7574 /* Similarly for static data members. */
7576 decl = build_lang_decl (VAR_DECL, name, type);
7578 decl = build_decl (input_location, VAR_DECL, name, type);
7580 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7581 set_decl_namespace (decl, explicit_scope, 0);
7583 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7585 if (declspecs->storage_class == sc_extern)
7587 DECL_THIS_EXTERN (decl) = 1;
7588 DECL_EXTERNAL (decl) = !initialized;
7591 if (DECL_CLASS_SCOPE_P (decl))
7593 set_linkage_for_static_data_member (decl);
7594 /* This function is only called with out-of-class definitions. */
7595 DECL_EXTERNAL (decl) = 0;
7596 check_class_member_definition_namespace (decl);
7598 /* At top level, either `static' or no s.c. makes a definition
7599 (perhaps tentative), and absence of `static' makes it public. */
7600 else if (toplevel_bindings_p ())
7602 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7603 && (DECL_THIS_EXTERN (decl) || ! constp));
7604 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7606 /* Not at top level, only `static' makes a static definition. */
7609 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7610 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7613 if (declspecs->specs[(int)ds_thread])
7614 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7616 /* If the type of the decl has no linkage, make sure that we'll
7617 notice that in mark_used. */
7618 if (cxx_dialect > cxx98
7619 && decl_linkage (decl) != lk_none
7620 && DECL_LANG_SPECIFIC (decl) == NULL
7621 && !DECL_EXTERN_C_P (decl)
7622 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7623 retrofit_lang_decl (decl);
7625 if (TREE_PUBLIC (decl))
7627 /* [basic.link]: A name with no linkage (notably, the name of a class
7628 or enumeration declared in a local scope) shall not be used to
7629 declare an entity with linkage.
7631 DR 757 relaxes this restriction for C++0x. */
7632 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7633 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7636 if (TYPE_ANONYMOUS_P (t))
7638 if (DECL_EXTERN_C_P (decl))
7639 /* Allow this; it's pretty common in C. */
7643 /* DRs 132, 319 and 389 seem to indicate types with
7644 no linkage can only be used to declare extern "C"
7645 entities. Since it's not always an error in the
7646 ISO C++ 90 Standard, we only issue a warning. */
7647 warning (0, "anonymous type with no linkage used to declare "
7648 "variable %q#D with linkage", decl);
7649 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7650 warning (0, "%q+#D does not refer to the unqualified "
7651 "type, so it is not used for linkage",
7656 warning (0, "type %qT with no linkage used to declare variable "
7657 "%q#D with linkage", t, decl);
7661 DECL_INTERFACE_KNOWN (decl) = 1;
7666 /* Create and return a canonical pointer to member function type, for
7667 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7670 build_ptrmemfunc_type (tree type)
7674 tree unqualified_variant = NULL_TREE;
7676 if (type == error_mark_node)
7679 /* If a canonical type already exists for this type, use it. We use
7680 this method instead of type_hash_canon, because it only does a
7681 simple equality check on the list of field members. */
7683 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7686 /* Make sure that we always have the unqualified pointer-to-member
7688 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7690 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7692 t = make_class_type (RECORD_TYPE);
7693 xref_basetypes (t, NULL_TREE);
7695 /* Let the front end know this is a pointer to member function... */
7696 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7697 /* ... and not really a class type. */
7698 SET_CLASS_TYPE_P (t, 0);
7700 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7703 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7705 DECL_CHAIN (field) = fields;
7708 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7710 /* Zap out the name so that the back end will give us the debugging
7711 information for this anonymous RECORD_TYPE. */
7712 TYPE_NAME (t) = NULL_TREE;
7714 /* If this is not the unqualified form of this pointer-to-member
7715 type, set the TYPE_MAIN_VARIANT for this type to be the
7716 unqualified type. Since they are actually RECORD_TYPEs that are
7717 not variants of each other, we must do this manually.
7718 As we just built a new type there is no need to do yet another copy. */
7719 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7721 int type_quals = cp_type_quals (type);
7722 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7723 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7724 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7725 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7726 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7727 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7728 TREE_TYPE (TYPE_BINFO (t)) = t;
7731 /* Cache this pointer-to-member type so that we can find it again
7733 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7735 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7736 SET_TYPE_STRUCTURAL_EQUALITY (t);
7737 else if (TYPE_CANONICAL (type) != type)
7738 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7743 /* Create and return a pointer to data member type. */
7746 build_ptrmem_type (tree class_type, tree member_type)
7748 if (TREE_CODE (member_type) == METHOD_TYPE)
7750 cp_cv_quals quals = type_memfn_quals (member_type);
7751 member_type = build_memfn_type (member_type, class_type, quals);
7752 return build_ptrmemfunc_type (build_pointer_type (member_type));
7756 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7757 return build_offset_type (class_type, member_type);
7761 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7762 Check to see that the definition is valid. Issue appropriate error
7763 messages. Return 1 if the definition is particularly bad, or 0
7767 check_static_variable_definition (tree decl, tree type)
7769 /* Can't check yet if we don't know the type. */
7770 if (dependent_type_p (type))
7772 /* If DECL is declared constexpr, we'll do the appropriate checks
7773 in check_initializer. */
7774 if (DECL_P (decl) && DECL_DECLARED_CONSTEXPR_P (decl))
7776 else if (cxx_dialect >= cxx0x && !INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7778 if (literal_type_p (type))
7779 permerror (input_location,
7780 "%<constexpr%> needed for in-class initialization of "
7781 "static data member %q#D of non-integral type", decl);
7783 error ("in-class initialization of static data member %q#D of "
7784 "non-literal type", decl);
7788 /* Motion 10 at San Diego: If a static const integral data member is
7789 initialized with an integral constant expression, the initializer
7790 may appear either in the declaration (within the class), or in
7791 the definition, but not both. If it appears in the class, the
7792 member is a member constant. The file-scope definition is always
7794 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7796 error ("invalid in-class initialization of static data member "
7797 "of non-integral type %qT",
7801 else if (!CP_TYPE_CONST_P (type))
7802 error ("ISO C++ forbids in-class initialization of non-const "
7803 "static member %qD",
7805 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7806 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7807 "%qD of non-integral type %qT", decl, type);
7812 /* *expr_p is part of the TYPE_SIZE of a variably-sized array. If any
7813 SAVE_EXPRs in *expr_p wrap expressions with side-effects, break those
7814 expressions out into temporary variables so that walk_tree doesn't
7815 step into them (c++/15764). */
7818 stabilize_save_expr_r (tree *expr_p, int *walk_subtrees, void *data)
7820 struct pointer_set_t *pset = (struct pointer_set_t *)data;
7821 tree expr = *expr_p;
7822 if (TREE_CODE (expr) == SAVE_EXPR)
7824 tree op = TREE_OPERAND (expr, 0);
7825 cp_walk_tree (&op, stabilize_save_expr_r, data, pset);
7826 if (TREE_SIDE_EFFECTS (op))
7827 TREE_OPERAND (expr, 0) = get_temp_regvar (TREE_TYPE (op), op);
7830 else if (!EXPR_P (expr) || !TREE_SIDE_EFFECTS (expr))
7835 /* Entry point for the above. */
7838 stabilize_vla_size (tree size)
7840 struct pointer_set_t *pset = pointer_set_create ();
7841 /* Break out any function calls into temporary variables. */
7842 cp_walk_tree (&size, stabilize_save_expr_r, pset, pset);
7845 /* Given the SIZE (i.e., number of elements) in an array, compute an
7846 appropriate index type for the array. If non-NULL, NAME is the
7847 name of the thing being declared. */
7850 compute_array_index_type (tree name, tree size, tsubst_flags_t complain)
7855 tree abi_1_itype = NULL_TREE;
7857 if (error_operand_p (size))
7858 return error_mark_node;
7860 type = TREE_TYPE (size);
7861 /* type_dependent_expression_p? */
7862 if (!dependent_type_p (type))
7864 mark_rvalue_use (size);
7866 if (cxx_dialect < cxx0x && TREE_CODE (size) == NOP_EXPR
7867 && TREE_SIDE_EFFECTS (size))
7868 /* In C++98, we mark a non-constant array bound with a magic
7869 NOP_EXPR with TREE_SIDE_EFFECTS; don't fold in that case. */;
7872 size = fold_non_dependent_expr (size);
7874 if (CLASS_TYPE_P (type)
7875 && CLASSTYPE_LITERAL_P (type))
7877 size = build_expr_type_conversion (WANT_INT, size, true);
7880 if (!(complain & tf_error))
7881 return error_mark_node;
7883 error ("size of array %qD has non-integral type %qT",
7886 error ("size of array has non-integral type %qT", type);
7887 size = integer_one_node;
7889 if (size == error_mark_node)
7890 return error_mark_node;
7891 type = TREE_TYPE (size);
7892 /* We didn't support this case in GCC 3.2, so don't bother
7893 trying to model it now in ABI v1. */
7894 abi_1_itype = error_mark_node;
7897 size = maybe_constant_value (size);
7898 if (!TREE_CONSTANT (size))
7902 if (error_operand_p (size))
7903 return error_mark_node;
7905 /* The array bound must be an integer type. */
7906 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7908 if (!(complain & tf_error))
7909 return error_mark_node;
7911 error ("size of array %qD has non-integral type %qT", name, type);
7913 error ("size of array has non-integral type %qT", type);
7914 size = integer_one_node;
7915 type = TREE_TYPE (size);
7919 /* A type is dependent if it is...an array type constructed from any
7920 dependent type or whose size is specified by a constant expression
7921 that is value-dependent. */
7922 /* We can only call value_dependent_expression_p on integral constant
7923 expressions; treat non-constant expressions as dependent, too. */
7924 if (processing_template_decl
7925 && (dependent_type_p (type)
7926 || !TREE_CONSTANT (size) || value_dependent_expression_p (size)))
7928 /* We cannot do any checking for a SIZE that isn't known to be
7929 constant. Just build the index type and mark that it requires
7930 structural equality checks. */
7931 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7932 size, integer_one_node));
7933 TYPE_DEPENDENT_P (itype) = 1;
7934 TYPE_DEPENDENT_P_VALID (itype) = 1;
7935 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7939 if (!abi_version_at_least (2) && processing_template_decl
7940 && abi_1_itype == NULL_TREE)
7941 /* For abi-1, we handled all instances in templates the same way,
7942 even when they were non-dependent. This affects the manglings
7943 produced. So, we do the normal checking for non-dependent
7944 sizes, but at the end we'll return the same type that abi-1
7945 would have, but with TYPE_CANONICAL set to the "right"
7946 value that the current ABI would provide. */
7947 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7948 osize, integer_one_node));
7950 /* Normally, the array-bound will be a constant. */
7951 if (TREE_CODE (size) == INTEGER_CST)
7953 /* Check to see if the array bound overflowed. Make that an
7954 error, no matter how generous we're being. */
7955 constant_expression_error (size);
7957 /* An array must have a positive number of elements. */
7958 if (INT_CST_LT (size, integer_zero_node))
7960 if (!(complain & tf_error))
7961 return error_mark_node;
7963 error ("size of array %qD is negative", name);
7965 error ("size of array is negative");
7966 size = integer_one_node;
7968 /* As an extension we allow zero-sized arrays. */
7969 else if (integer_zerop (size))
7971 if (!(complain & tf_error))
7972 /* We must fail if performing argument deduction (as
7973 indicated by the state of complain), so that
7974 another substitution can be found. */
7975 return error_mark_node;
7976 else if (in_system_header)
7977 /* Allow them in system headers because glibc uses them. */;
7979 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7981 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7984 else if (TREE_CONSTANT (size)
7985 /* We don't allow VLAs at non-function scopes, or during
7986 tentative template substitution. */
7987 || !at_function_scope_p () || !(complain & tf_error))
7989 if (!(complain & tf_error))
7990 return error_mark_node;
7991 /* `(int) &fn' is not a valid array bound. */
7993 error ("size of array %qD is not an integral constant-expression",
7996 error ("size of array is not an integral constant-expression");
7997 size = integer_one_node;
7999 else if (pedantic && warn_vla != 0)
8002 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
8004 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
8006 else if (warn_vla > 0)
8010 "variable length array %qD is used", name);
8013 "variable length array is used");
8016 if (processing_template_decl && !TREE_CONSTANT (size))
8017 /* A variable sized array. */
8018 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
8021 HOST_WIDE_INT saved_processing_template_decl;
8023 /* Compute the index of the largest element in the array. It is
8024 one less than the number of elements in the array. We save
8025 and restore PROCESSING_TEMPLATE_DECL so that computations in
8026 cp_build_binary_op will be appropriately folded. */
8027 saved_processing_template_decl = processing_template_decl;
8028 processing_template_decl = 0;
8029 itype = cp_build_binary_op (input_location,
8031 cp_convert (ssizetype, size),
8032 cp_convert (ssizetype, integer_one_node),
8033 tf_warning_or_error);
8034 itype = fold (itype);
8035 processing_template_decl = saved_processing_template_decl;
8037 if (!TREE_CONSTANT (itype))
8038 /* A variable sized array. */
8039 itype = variable_size (itype);
8040 /* Make sure that there was no overflow when creating to a signed
8041 index type. (For example, on a 32-bit machine, an array with
8042 size 2^32 - 1 is too big.) */
8043 else if (TREE_CODE (itype) == INTEGER_CST
8044 && TREE_OVERFLOW (itype))
8046 if (!(complain & tf_error))
8047 return error_mark_node;
8048 error ("overflow in array dimension");
8049 TREE_OVERFLOW (itype) = 0;
8053 /* Create and return the appropriate index type. */
8054 if (abi_1_itype && abi_1_itype != error_mark_node)
8056 tree t = build_index_type (itype);
8057 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
8058 itype = abi_1_itype;
8061 itype = build_index_type (itype);
8063 /* If the index type were dependent, we would have returned early, so
8064 remember that it isn't. */
8065 TYPE_DEPENDENT_P (itype) = 0;
8066 TYPE_DEPENDENT_P_VALID (itype) = 1;
8070 /* Returns the scope (if any) in which the entity declared by
8071 DECLARATOR will be located. If the entity was declared with an
8072 unqualified name, NULL_TREE is returned. */
8075 get_scope_of_declarator (const cp_declarator *declarator)
8077 while (declarator && declarator->kind != cdk_id)
8078 declarator = declarator->declarator;
8080 /* If the declarator-id is a SCOPE_REF, the scope in which the
8081 declaration occurs is the first operand. */
8083 && declarator->u.id.qualifying_scope)
8084 return declarator->u.id.qualifying_scope;
8086 /* Otherwise, the declarator is not a qualified name; the entity will
8087 be declared in the current scope. */
8091 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
8092 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
8096 create_array_type_for_decl (tree name, tree type, tree size)
8098 tree itype = NULL_TREE;
8100 /* If things have already gone awry, bail now. */
8101 if (type == error_mark_node || size == error_mark_node)
8102 return error_mark_node;
8104 /* 8.3.4/1: If the type of the identifier of D contains the auto
8105 type-specifier, the program is ill-formed. */
8106 if (pedantic && type_uses_auto (type))
8107 pedwarn (input_location, OPT_pedantic,
8108 "declaration of %qD as array of %<auto%>", name);
8110 /* If there are some types which cannot be array elements,
8111 issue an error-message and return. */
8112 switch (TREE_CODE (type))
8116 error ("declaration of %qD as array of void", name);
8118 error ("creating array of void");
8119 return error_mark_node;
8123 error ("declaration of %qD as array of functions", name);
8125 error ("creating array of functions");
8126 return error_mark_node;
8128 case REFERENCE_TYPE:
8130 error ("declaration of %qD as array of references", name);
8132 error ("creating array of references");
8133 return error_mark_node;
8137 error ("declaration of %qD as array of function members", name);
8139 error ("creating array of function members");
8140 return error_mark_node;
8148 The constant expressions that specify the bounds of the arrays
8149 can be omitted only for the first member of the sequence. */
8150 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
8153 error ("declaration of %qD as multidimensional array must "
8154 "have bounds for all dimensions except the first",
8157 error ("multidimensional array must have bounds for all "
8158 "dimensions except the first");
8160 return error_mark_node;
8163 /* Figure out the index type for the array. */
8165 itype = compute_array_index_type (name, size, tf_warning_or_error);
8168 T is called the array element type; this type shall not be [...] an
8169 abstract class type. */
8170 abstract_virtuals_error (name, type);
8172 return build_cplus_array_type (type, itype);
8175 /* Check that it's OK to declare a function with the indicated TYPE.
8176 SFK indicates the kind of special function (if any) that this
8177 function is. OPTYPE is the type given in a conversion operator
8178 declaration, or the class type for a constructor/destructor.
8179 Returns the actual return type of the function; that
8180 may be different than TYPE if an error occurs, or for certain
8181 special functions. */
8184 check_special_function_return_type (special_function_kind sfk,
8190 case sfk_constructor:
8192 error ("return type specification for constructor invalid");
8194 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8195 type = build_pointer_type (optype);
8197 type = void_type_node;
8200 case sfk_destructor:
8202 error ("return type specification for destructor invalid");
8203 /* We can't use the proper return type here because we run into
8204 problems with ambiguous bases and covariant returns.
8205 Java classes are left unchanged because (void *) isn't a valid
8206 Java type, and we don't want to change the Java ABI. */
8207 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
8208 type = build_pointer_type (void_type_node);
8210 type = void_type_node;
8213 case sfk_conversion:
8215 error ("return type specified for %<operator %T%>", optype);
8226 /* A variable or data member (whose unqualified name is IDENTIFIER)
8227 has been declared with the indicated TYPE. If the TYPE is not
8228 acceptable, issue an error message and return a type to use for
8229 error-recovery purposes. */
8232 check_var_type (tree identifier, tree type)
8234 if (VOID_TYPE_P (type))
8237 error ("unnamed variable or field declared void");
8238 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
8240 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
8241 error ("variable or field %qE declared void", identifier);
8244 error ("variable or field declared void");
8245 type = error_mark_node;
8251 /* Given declspecs and a declarator (abstract or otherwise), determine
8252 the name and type of the object declared and construct a DECL node
8255 DECLSPECS points to the representation of declaration-specifier
8256 sequence that precedes declarator.
8258 DECL_CONTEXT says which syntactic context this declaration is in:
8259 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
8260 FUNCDEF for a function definition. Like NORMAL but a few different
8261 error messages in each case. Return value may be zero meaning
8262 this definition is too screwy to try to parse.
8263 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
8264 handle member functions (which have FIELD context).
8265 Return value may be zero meaning this definition is too screwy to
8267 PARM for a parameter declaration (either within a function prototype
8268 or before a function body). Make a PARM_DECL, or return void_type_node.
8269 TPARM for a template parameter declaration.
8270 CATCHPARM for a parameter declaration before a catch clause.
8271 TYPENAME if for a typename (in a cast or sizeof).
8272 Don't make a DECL node; just return the ..._TYPE node.
8273 FIELD for a struct or union field; make a FIELD_DECL.
8274 BITFIELD for a field with specified width.
8276 INITIALIZED is as for start_decl.
8278 ATTRLIST is a pointer to the list of attributes, which may be NULL
8279 if there are none; *ATTRLIST may be modified if attributes from inside
8280 the declarator should be applied to the declaration.
8282 When this function is called, scoping variables (such as
8283 CURRENT_CLASS_TYPE) should reflect the scope in which the
8284 declaration occurs, not the scope in which the new declaration will
8285 be placed. For example, on:
8289 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
8292 Returns a DECL (if a declarator is present), a TYPE (if there is no
8293 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
8297 grokdeclarator (const cp_declarator *declarator,
8298 const cp_decl_specifier_seq *declspecs,
8299 enum decl_context decl_context,
8303 tree type = NULL_TREE;
8305 int explicit_int128 = 0;
8306 int virtualp, explicitp, friendp, inlinep, staticp;
8307 int explicit_int = 0;
8308 int explicit_char = 0;
8309 int defaulted_int = 0;
8310 tree dependent_name = NULL_TREE;
8312 tree typedef_decl = NULL_TREE;
8313 const char *name = NULL;
8314 tree typedef_type = NULL_TREE;
8315 /* True if this declarator is a function definition. */
8316 bool funcdef_flag = false;
8317 cp_declarator_kind innermost_code = cdk_error;
8320 /* See the code below that used this. */
8321 tree decl_attr = NULL_TREE;
8324 /* Keep track of what sort of function is being processed
8325 so that we can warn about default return values, or explicit
8326 return values which do not match prescribed defaults. */
8327 special_function_kind sfk = sfk_none;
8329 tree dname = NULL_TREE;
8330 tree ctor_return_type = NULL_TREE;
8331 enum overload_flags flags = NO_SPECIAL;
8332 /* cv-qualifiers that apply to the declarator, for a declaration of
8333 a member function. */
8334 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
8335 /* virt-specifiers that apply to the declarator, for a declaration of
8336 a member function. */
8337 cp_virt_specifiers virt_specifiers = VIRT_SPEC_UNSPECIFIED;
8338 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
8340 tree raises = NULL_TREE;
8341 int template_count = 0;
8342 tree returned_attrs = NULL_TREE;
8343 tree parms = NULL_TREE;
8344 const cp_declarator *id_declarator;
8345 /* The unqualified name of the declarator; either an
8346 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
8347 tree unqualified_id;
8348 /* The class type, if any, in which this entity is located,
8349 or NULL_TREE if none. Note that this value may be different from
8350 the current class type; for example if an attempt is made to declare
8351 "A::f" inside "B", this value will be "A". */
8352 tree ctype = current_class_type;
8353 /* The NAMESPACE_DECL for the namespace in which this entity is
8354 located. If an unqualified name is used to declare the entity,
8355 this value will be NULL_TREE, even if the entity is located at
8357 tree in_namespace = NULL_TREE;
8358 cp_storage_class storage_class;
8359 bool unsigned_p, signed_p, short_p, long_p, thread_p;
8360 bool type_was_error_mark_node = false;
8361 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
8362 bool template_type_arg = false;
8363 bool template_parm_flag = false;
8364 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
8367 signed_p = declspecs->specs[(int)ds_signed];
8368 unsigned_p = declspecs->specs[(int)ds_unsigned];
8369 short_p = declspecs->specs[(int)ds_short];
8370 long_p = declspecs->specs[(int)ds_long];
8371 longlong = declspecs->specs[(int)ds_long] >= 2;
8372 explicit_int128 = declspecs->explicit_int128_p;
8373 thread_p = declspecs->specs[(int)ds_thread];
8375 if (decl_context == FUNCDEF)
8376 funcdef_flag = true, decl_context = NORMAL;
8377 else if (decl_context == MEMFUNCDEF)
8378 funcdef_flag = true, decl_context = FIELD;
8379 else if (decl_context == BITFIELD)
8380 bitfield = 1, decl_context = FIELD;
8381 else if (decl_context == TEMPLATE_TYPE_ARG)
8382 template_type_arg = true, decl_context = TYPENAME;
8383 else if (decl_context == TPARM)
8384 template_parm_flag = true, decl_context = PARM;
8386 if (initialized > 1)
8387 funcdef_flag = true;
8389 /* Look inside a declarator for the name being declared
8390 and get it as a string, for an error message. */
8391 for (id_declarator = declarator;
8393 id_declarator = id_declarator->declarator)
8395 if (id_declarator->kind != cdk_id)
8396 innermost_code = id_declarator->kind;
8398 switch (id_declarator->kind)
8401 if (id_declarator->declarator
8402 && id_declarator->declarator->kind == cdk_id)
8404 sfk = id_declarator->declarator->u.id.sfk;
8405 if (sfk == sfk_destructor)
8412 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
8413 tree decl = id_declarator->u.id.unqualified_name;
8416 if (qualifying_scope)
8418 if (at_function_scope_p ())
8422 A declarator-id shall not be qualified except
8425 None of the cases are permitted in block
8427 if (qualifying_scope == global_namespace)
8428 error ("invalid use of qualified-name %<::%D%>",
8430 else if (TYPE_P (qualifying_scope))
8431 error ("invalid use of qualified-name %<%T::%D%>",
8432 qualifying_scope, decl);
8434 error ("invalid use of qualified-name %<%D::%D%>",
8435 qualifying_scope, decl);
8436 return error_mark_node;
8438 else if (TYPE_P (qualifying_scope))
8440 ctype = qualifying_scope;
8441 if (!MAYBE_CLASS_TYPE_P (ctype))
8443 error ("%q#T is not a class or a namespace", ctype);
8446 else if (innermost_code != cdk_function
8447 && current_class_type
8448 && !UNIQUELY_DERIVED_FROM_P (ctype,
8449 current_class_type))
8451 error ("type %qT is not derived from type %qT",
8452 ctype, current_class_type);
8453 return error_mark_node;
8456 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
8457 in_namespace = qualifying_scope;
8459 switch (TREE_CODE (decl))
8465 if (innermost_code != cdk_function)
8467 error ("declaration of %qD as non-function", decl);
8468 return error_mark_node;
8470 else if (!qualifying_scope
8471 && !(current_class_type && at_class_scope_p ()))
8473 error ("declaration of %qD as non-member", decl);
8474 return error_mark_node;
8477 type = TREE_OPERAND (decl, 0);
8479 type = constructor_name (type);
8480 name = identifier_to_locale (IDENTIFIER_POINTER (type));
8485 case TEMPLATE_ID_EXPR:
8487 tree fns = TREE_OPERAND (decl, 0);
8490 if (TREE_CODE (dname) != IDENTIFIER_NODE)
8492 gcc_assert (is_overloaded_fn (dname));
8493 dname = DECL_NAME (get_first_fn (dname));
8498 case IDENTIFIER_NODE:
8499 if (TREE_CODE (decl) == IDENTIFIER_NODE)
8502 if (C_IS_RESERVED_WORD (dname))
8504 error ("declarator-id missing; using reserved word %qD",
8506 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8508 else if (!IDENTIFIER_TYPENAME_P (dname))
8509 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8512 gcc_assert (flags == NO_SPECIAL);
8513 flags = TYPENAME_FLAG;
8514 ctor_return_type = TREE_TYPE (dname);
8515 sfk = sfk_conversion;
8516 if (is_typename_at_global_scope (dname))
8517 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
8519 name = "<invalid operator>";
8536 return error_mark_node;
8541 if (id_declarator->kind == cdk_id)
8547 The declarator in a function-definition shall have the form
8548 D1 ( parameter-declaration-clause) ... */
8549 if (funcdef_flag && innermost_code != cdk_function)
8551 error ("function definition does not declare parameters");
8552 return error_mark_node;
8555 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8556 && innermost_code != cdk_function
8557 && ! (ctype && !declspecs->any_specifiers_p))
8559 error ("declaration of %qD as non-function", dname);
8560 return error_mark_node;
8564 && TREE_CODE (dname) == IDENTIFIER_NODE
8565 && UDLIT_OPER_P (dname)
8566 && innermost_code != cdk_function)
8568 error ("declaration of %qD as non-function", dname);
8569 return error_mark_node;
8572 if (dname && IDENTIFIER_OPNAME_P (dname))
8574 if (declspecs->specs[(int)ds_typedef])
8576 error ("declaration of %qD as %<typedef%>", dname);
8577 return error_mark_node;
8579 else if (decl_context == PARM || decl_context == CATCHPARM)
8581 error ("declaration of %qD as parameter", dname);
8582 return error_mark_node;
8586 /* Anything declared one level down from the top level
8587 must be one of the parameters of a function
8588 (because the body is at least two levels down). */
8590 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8591 by not allowing C++ class definitions to specify their parameters
8592 with xdecls (must be spec.d in the parmlist).
8594 Since we now wait to push a class scope until we are sure that
8595 we are in a legitimate method context, we must set oldcname
8596 explicitly (since current_class_name is not yet alive).
8598 We also want to avoid calling this a PARM if it is in a namespace. */
8600 if (decl_context == NORMAL && !toplevel_bindings_p ())
8602 cp_binding_level *b = current_binding_level;
8603 current_binding_level = b->level_chain;
8604 if (current_binding_level != 0 && toplevel_bindings_p ())
8605 decl_context = PARM;
8606 current_binding_level = b;
8610 name = decl_context == PARM ? "parameter" : "type name";
8612 if (constexpr_p && declspecs->specs[(int)ds_typedef])
8614 error ("%<constexpr%> cannot appear in a typedef declaration");
8615 return error_mark_node;
8618 /* If there were multiple types specified in the decl-specifier-seq,
8619 issue an error message. */
8620 if (declspecs->multiple_types_p)
8622 error ("two or more data types in declaration of %qs", name);
8623 return error_mark_node;
8626 if (declspecs->conflicting_specifiers_p)
8628 error ("conflicting specifiers in declaration of %qs", name);
8629 return error_mark_node;
8632 /* Extract the basic type from the decl-specifier-seq. */
8633 type = declspecs->type;
8634 if (type == error_mark_node)
8637 type_was_error_mark_node = true;
8639 /* If the entire declaration is itself tagged as deprecated then
8640 suppress reports of deprecated items. */
8641 if (type && TREE_DEPRECATED (type)
8642 && deprecated_state != DEPRECATED_SUPPRESS)
8643 warn_deprecated_use (type, NULL_TREE);
8644 if (type && TREE_CODE (type) == TYPE_DECL)
8646 typedef_decl = type;
8647 type = TREE_TYPE (typedef_decl);
8648 if (TREE_DEPRECATED (type)
8649 && DECL_ARTIFICIAL (typedef_decl)
8650 && deprecated_state != DEPRECATED_SUPPRESS)
8651 warn_deprecated_use (type, NULL_TREE);
8653 /* No type at all: default to `int', and set DEFAULTED_INT
8654 because it was not a user-defined typedef. */
8655 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8657 /* These imply 'int'. */
8658 type = integer_type_node;
8662 explicit_int = declspecs->explicit_int_p;
8663 explicit_char = declspecs->explicit_char_p;
8666 /* See the code below that used this. */
8668 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8670 typedef_type = type;
8673 if (sfk != sfk_conversion)
8674 ctor_return_type = ctype;
8676 if (sfk != sfk_none)
8677 type = check_special_function_return_type (sfk, type,
8679 else if (type == NULL_TREE)
8685 /* We handle `main' specially here, because 'main () { }' is so
8686 common. With no options, it is allowed. With -Wreturn-type,
8687 it is a warning. It is only an error with -pedantic-errors. */
8688 is_main = (funcdef_flag
8689 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8690 && MAIN_NAME_P (dname)
8691 && ctype == NULL_TREE
8692 && in_namespace == NULL_TREE
8693 && current_namespace == global_namespace);
8695 if (type_was_error_mark_node)
8696 /* We've already issued an error, don't complain more. */;
8697 else if (in_system_header || flag_ms_extensions)
8698 /* Allow it, sigh. */;
8700 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8702 pedwarn (input_location, OPT_pedantic,
8703 "ISO C++ forbids declaration of %qs with no type", name);
8705 warning (OPT_Wreturn_type,
8706 "ISO C++ forbids declaration of %qs with no type", name);
8708 type = integer_type_node;
8713 if (explicit_int128)
8715 if (int128_integer_type_node == NULL_TREE)
8717 error ("%<__int128%> is not supported by this target");
8718 explicit_int128 = false;
8720 else if (pedantic && ! in_system_header)
8721 pedwarn (input_location, OPT_pedantic,
8722 "ISO C++ does not support %<__int128%> for %qs", name);
8725 /* Now process the modifiers that were specified
8726 and check for invalid combinations. */
8728 /* Long double is a special combination. */
8729 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8732 type = cp_build_qualified_type (long_double_type_node,
8733 cp_type_quals (type));
8736 /* Check all other uses of type modifiers. */
8738 if (unsigned_p || signed_p || long_p || short_p)
8742 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8743 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8744 else if (signed_p && unsigned_p)
8745 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8746 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8747 error ("%<long long%> invalid for %qs", name);
8748 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8749 error ("%<long%> invalid for %qs", name);
8750 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8751 error ("%<short%> invalid for %qs", name);
8752 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8753 error ("%<long%> or %<short%> invalid for %qs", name);
8754 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8755 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8756 else if ((long_p || short_p) && explicit_char)
8757 error ("%<long%> or %<short%> specified with char for %qs", name);
8758 else if (long_p && short_p)
8759 error ("%<long%> and %<short%> specified together for %qs", name);
8760 else if (type == char16_type_node || type == char32_type_node)
8762 if (signed_p || unsigned_p)
8763 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8764 else if (short_p || long_p)
8765 error ("%<short%> or %<long%> invalid for %qs", name);
8770 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8772 pedwarn (input_location, OPT_pedantic,
8773 "long, short, signed or unsigned used invalidly for %qs",
8775 if (flag_pedantic_errors)
8780 /* Discard the type modifiers if they are invalid. */
8791 /* Decide whether an integer type is signed or not.
8792 Optionally treat bitfields as signed by default. */
8796 It is implementation-defined whether a plain (neither
8797 explicitly signed or unsigned) char, short, int, or long
8798 bit-field is signed or unsigned.
8800 Naturally, we extend this to long long as well. Note that
8801 this does not include wchar_t. */
8802 || (bitfield && !flag_signed_bitfields
8804 /* A typedef for plain `int' without `signed' can be
8805 controlled just like plain `int', but a typedef for
8806 `signed int' cannot be so controlled. */
8808 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8809 && TREE_CODE (type) == INTEGER_TYPE
8810 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8812 if (explicit_int128)
8813 type = int128_unsigned_type_node;
8815 type = long_long_unsigned_type_node;
8817 type = long_unsigned_type_node;
8819 type = short_unsigned_type_node;
8820 else if (type == char_type_node)
8821 type = unsigned_char_type_node;
8822 else if (typedef_decl)
8823 type = unsigned_type_for (type);
8825 type = unsigned_type_node;
8827 else if (signed_p && type == char_type_node)
8828 type = signed_char_type_node;
8829 else if (explicit_int128)
8830 type = int128_integer_type_node;
8832 type = long_long_integer_type_node;
8834 type = long_integer_type_node;
8836 type = short_integer_type_node;
8838 if (declspecs->specs[(int)ds_complex])
8840 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8841 error ("complex invalid for %qs", name);
8842 /* If we just have "complex", it is equivalent to
8843 "complex double", but if any modifiers at all are specified it is
8844 the complex form of TYPE. E.g, "complex short" is
8845 "complex short int". */
8846 else if (defaulted_int && ! longlong && ! explicit_int128
8847 && ! (long_p || short_p || signed_p || unsigned_p))
8848 type = complex_double_type_node;
8849 else if (type == integer_type_node)
8850 type = complex_integer_type_node;
8851 else if (type == float_type_node)
8852 type = complex_float_type_node;
8853 else if (type == double_type_node)
8854 type = complex_double_type_node;
8855 else if (type == long_double_type_node)
8856 type = complex_long_double_type_node;
8858 type = build_complex_type (type);
8861 type_quals = TYPE_UNQUALIFIED;
8862 if (declspecs->specs[(int)ds_const])
8863 type_quals |= TYPE_QUAL_CONST;
8864 if (declspecs->specs[(int)ds_volatile])
8865 type_quals |= TYPE_QUAL_VOLATILE;
8866 if (declspecs->specs[(int)ds_restrict])
8867 type_quals |= TYPE_QUAL_RESTRICT;
8868 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8869 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8872 type_quals |= cp_type_quals (type);
8873 type = cp_build_qualified_type_real
8874 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8875 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8876 /* We might have ignored or rejected some of the qualifiers. */
8877 type_quals = cp_type_quals (type);
8880 inlinep = !! declspecs->specs[(int)ds_inline];
8881 virtualp = !! declspecs->specs[(int)ds_virtual];
8882 explicitp = !! declspecs->specs[(int)ds_explicit];
8884 storage_class = declspecs->storage_class;
8885 if (storage_class == sc_static)
8886 staticp = 1 + (decl_context == FIELD);
8888 if (virtualp && staticp == 2)
8890 error ("member %qD cannot be declared both virtual and static", dname);
8891 storage_class = sc_none;
8894 friendp = !! declspecs->specs[(int)ds_friend];
8896 if (dependent_name && !friendp)
8898 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8899 return error_mark_node;
8902 /* Issue errors about use of storage classes for parameters. */
8903 if (decl_context == PARM)
8905 if (declspecs->specs[(int)ds_typedef])
8907 error ("typedef declaration invalid in parameter declaration");
8908 return error_mark_node;
8910 else if (template_parm_flag && storage_class != sc_none)
8912 error ("storage class specified for template parameter %qs", name);
8913 return error_mark_node;
8915 else if (storage_class == sc_static
8916 || storage_class == sc_extern
8918 error ("storage class specifiers invalid in parameter declarations");
8920 /* Function parameters cannot be constexpr. If we saw one, moan
8921 and pretend it wasn't there. */
8924 error ("a parameter cannot be declared %<constexpr%>");
8929 /* Give error if `virtual' is used outside of class declaration. */
8931 && (current_class_name == NULL_TREE || decl_context != FIELD))
8933 error ("%<virtual%> outside class declaration");
8937 /* Static anonymous unions are dealt with here. */
8938 if (staticp && decl_context == TYPENAME
8940 && ANON_AGGR_TYPE_P (declspecs->type))
8941 decl_context = FIELD;
8943 /* Warn about storage classes that are invalid for certain
8944 kinds of declarations (parameters, typenames, etc.). */
8947 && storage_class != sc_extern
8948 && storage_class != sc_static)
8949 || declspecs->specs[(int)ds_typedef]))
8951 error ("multiple storage classes in declaration of %qs", name);
8954 if (decl_context != NORMAL
8955 && ((storage_class != sc_none
8956 && storage_class != sc_mutable)
8959 if ((decl_context == PARM || decl_context == CATCHPARM)
8960 && (storage_class == sc_register
8961 || storage_class == sc_auto))
8963 else if (declspecs->specs[(int)ds_typedef])
8965 else if (decl_context == FIELD
8966 /* C++ allows static class elements. */
8967 && storage_class == sc_static)
8968 /* C++ also allows inlines and signed and unsigned elements,
8969 but in those cases we don't come in here. */
8973 if (decl_context == FIELD)
8974 error ("storage class specified for %qs", name);
8977 if (decl_context == PARM || decl_context == CATCHPARM)
8978 error ("storage class specified for parameter %qs", name);
8980 error ("storage class specified for typename");
8982 if (storage_class == sc_register
8983 || storage_class == sc_auto
8984 || storage_class == sc_extern
8986 storage_class = sc_none;
8989 else if (storage_class == sc_extern && funcdef_flag
8990 && ! toplevel_bindings_p ())
8991 error ("nested function %qs declared %<extern%>", name);
8992 else if (toplevel_bindings_p ())
8994 if (storage_class == sc_auto)
8995 error ("top-level declaration of %qs specifies %<auto%>", name);
8998 && storage_class != sc_extern
8999 && storage_class != sc_static)
9001 error ("function-scope %qs implicitly auto and declared %<__thread%>",
9006 if (storage_class && friendp)
9008 error ("storage class specifiers invalid in friend function declarations");
9009 storage_class = sc_none;
9014 unqualified_id = NULL_TREE;
9017 unqualified_id = id_declarator->u.id.unqualified_name;
9018 switch (TREE_CODE (unqualified_id))
9021 unqualified_id = TREE_OPERAND (unqualified_id, 0);
9022 if (TYPE_P (unqualified_id))
9023 unqualified_id = constructor_name (unqualified_id);
9026 case IDENTIFIER_NODE:
9027 case TEMPLATE_ID_EXPR:
9035 /* Determine the type of the entity declared by recurring on the
9037 for (; declarator; declarator = declarator->declarator)
9039 const cp_declarator *inner_declarator;
9042 if (type == error_mark_node)
9043 return error_mark_node;
9045 attrs = declarator->attributes;
9051 if (declarator == NULL || declarator->kind == cdk_id)
9052 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
9053 if (declarator->kind == cdk_function)
9054 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
9055 if (declarator->kind == cdk_array)
9056 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
9057 returned_attrs = decl_attributes (&type,
9058 chainon (returned_attrs, attrs),
9062 if (declarator->kind == cdk_id)
9065 inner_declarator = declarator->declarator;
9067 switch (declarator->kind)
9070 type = create_array_type_for_decl (dname, type,
9071 declarator->u.array.bounds);
9079 /* Declaring a function type.
9080 Make sure we have a valid type for the function to return. */
9082 if (type_quals != TYPE_UNQUALIFIED)
9084 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
9085 warning (OPT_Wignored_qualifiers,
9086 "type qualifiers ignored on function return type");
9087 /* We now know that the TYPE_QUALS don't apply to the
9088 decl, but to its return type. */
9089 type_quals = TYPE_UNQUALIFIED;
9091 errmsg = targetm.invalid_return_type (type);
9095 type = integer_type_node;
9098 /* Error about some types functions can't return. */
9100 if (TREE_CODE (type) == FUNCTION_TYPE)
9102 error ("%qs declared as function returning a function", name);
9103 return error_mark_node;
9105 if (TREE_CODE (type) == ARRAY_TYPE)
9107 error ("%qs declared as function returning an array", name);
9108 return error_mark_node;
9111 /* Pick up type qualifiers which should be applied to `this'. */
9112 memfn_quals = declarator->u.function.qualifiers;
9113 /* Pick up virt-specifiers. */
9114 virt_specifiers = declarator->u.function.virt_specifiers;
9115 /* Pick up the exception specifications. */
9116 raises = declarator->u.function.exception_specification;
9117 /* If the exception-specification is ill-formed, let's pretend
9118 there wasn't one. */
9119 if (raises == error_mark_node)
9122 /* Say it's a definition only for the CALL_EXPR
9123 closest to the identifier. */
9124 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
9126 /* Handle a late-specified return type. */
9129 if (type_uses_auto (type))
9131 if (!declarator->u.function.late_return_type)
9133 error ("%qs function uses %<auto%> type specifier without"
9134 " trailing return type", name);
9135 return error_mark_node;
9137 else if (!is_auto (type))
9139 error ("%qs function with trailing return type has"
9140 " %qT as its type rather than plain %<auto%>",
9142 return error_mark_node;
9145 else if (declarator->u.function.late_return_type)
9147 if (cxx_dialect < cxx0x)
9148 /* Not using maybe_warn_cpp0x because this should
9149 always be an error. */
9150 error ("trailing return type only available with "
9151 "-std=c++11 or -std=gnu++11");
9153 error ("%qs function with trailing return type not "
9154 "declared with %<auto%> type specifier", name);
9155 return error_mark_node;
9158 type = splice_late_return_type
9159 (type, declarator->u.function.late_return_type);
9160 if (type == error_mark_node)
9161 return error_mark_node;
9163 if (ctype == NULL_TREE
9164 && decl_context == FIELD
9166 && (friendp == 0 || dname == current_class_name))
9167 ctype = current_class_type;
9169 if (ctype && (sfk == sfk_constructor
9170 || sfk == sfk_destructor))
9172 /* We are within a class's scope. If our declarator name
9173 is the same as the class name, and we are defining
9174 a function, then it is a constructor/destructor, and
9175 therefore returns a void type. */
9177 /* ISO C++ 12.4/2. A destructor may not be declared
9178 const or volatile. A destructor may not be
9181 ISO C++ 12.1. A constructor may not be declared
9182 const or volatile. A constructor may not be
9183 virtual. A constructor may not be static. */
9185 error ((flags == DTOR_FLAG)
9186 ? G_("destructor cannot be static member function")
9187 : G_("constructor cannot be static member function"));
9190 error ((flags == DTOR_FLAG)
9191 ? G_("destructors may not be cv-qualified")
9192 : G_("constructors may not be cv-qualified"));
9193 memfn_quals = TYPE_UNQUALIFIED;
9196 if (decl_context == FIELD
9197 && !member_function_or_else (ctype,
9200 return error_mark_node;
9202 if (flags != DTOR_FLAG)
9204 /* It's a constructor. */
9209 permerror (input_location, "constructors cannot be declared virtual");
9212 if (decl_context == FIELD
9213 && sfk != sfk_constructor)
9214 return error_mark_node;
9216 if (decl_context == FIELD)
9222 error ("can%'t initialize friend function %qs", name);
9225 /* Cannot be both friend and virtual. */
9226 error ("virtual functions cannot be friends");
9229 if (decl_context == NORMAL)
9230 error ("friend declaration not in class definition");
9231 if (current_function_decl && funcdef_flag)
9232 error ("can%'t define friend function %qs in a local "
9236 else if (ctype && sfk == sfk_conversion)
9240 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
9245 arg_types = grokparms (declarator->u.function.parameters,
9248 if (inner_declarator
9249 && inner_declarator->kind == cdk_id
9250 && inner_declarator->u.id.sfk == sfk_destructor
9251 && arg_types != void_list_node)
9253 error ("destructors may not have parameters");
9254 arg_types = void_list_node;
9258 type = build_function_type (type, arg_types);
9265 /* Filter out pointers-to-references and references-to-references.
9266 We can get these if a TYPE_DECL is used. */
9268 if (TREE_CODE (type) == REFERENCE_TYPE)
9270 if (declarator->kind != cdk_reference)
9272 error ("cannot declare pointer to %q#T", type);
9273 type = TREE_TYPE (type);
9276 /* In C++0x, we allow reference to reference declarations
9277 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
9278 and template type arguments [14.3.1/4 temp.arg.type]. The
9279 check for direct reference to reference declarations, which
9280 are still forbidden, occurs below. Reasoning behind the change
9281 can be found in DR106, DR540, and the rvalue reference
9283 else if (cxx_dialect == cxx98)
9285 error ("cannot declare reference to %q#T", type);
9286 type = TREE_TYPE (type);
9289 else if (VOID_TYPE_P (type))
9291 if (declarator->kind == cdk_reference)
9292 error ("cannot declare reference to %q#T", type);
9293 else if (declarator->kind == cdk_ptrmem)
9294 error ("cannot declare pointer to %q#T member", type);
9297 /* We now know that the TYPE_QUALS don't apply to the decl,
9298 but to the target of the pointer. */
9299 type_quals = TYPE_UNQUALIFIED;
9301 if (declarator->kind == cdk_ptrmem
9302 && (TREE_CODE (type) == FUNCTION_TYPE
9303 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
9305 memfn_quals |= type_memfn_quals (type);
9306 type = build_memfn_type (type,
9307 declarator->u.pointer.class_type,
9309 if (type == error_mark_node)
9310 return error_mark_node;
9311 memfn_quals = TYPE_UNQUALIFIED;
9314 if (TREE_CODE (type) == FUNCTION_TYPE
9315 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
9316 error (declarator->kind == cdk_reference
9317 ? G_("cannot declare reference to qualified function type %qT")
9318 : G_("cannot declare pointer to qualified function type %qT"),
9321 /* When the pointed-to type involves components of variable size,
9322 care must be taken to ensure that the size evaluation code is
9323 emitted early enough to dominate all the possible later uses
9324 and late enough for the variables on which it depends to have
9327 This is expected to happen automatically when the pointed-to
9328 type has a name/declaration of it's own, but special attention
9329 is required if the type is anonymous.
9331 We handle the NORMAL and FIELD contexts here by inserting a
9332 dummy statement that just evaluates the size at a safe point
9333 and ensures it is not deferred until e.g. within a deeper
9334 conditional context (c++/43555).
9336 We expect nothing to be needed here for PARM or TYPENAME.
9337 Evaluating the size at this point for TYPENAME would
9338 actually be incorrect, as we might be in the middle of an
9339 expression with side effects on the pointed-to type size
9340 "arguments" prior to the pointer declaration point and the
9341 size evaluation could end up prior to the side effects. */
9343 if (!TYPE_NAME (type)
9344 && (decl_context == NORMAL || decl_context == FIELD)
9345 && at_function_scope_p ()
9346 && variably_modified_type_p (type, NULL_TREE))
9348 /* First break out any side-effects. */
9349 stabilize_vla_size (TYPE_SIZE (type));
9350 /* And then force evaluation of the SAVE_EXPR. */
9351 finish_expr_stmt (TYPE_SIZE (type));
9354 if (declarator->kind == cdk_reference)
9356 /* In C++0x, the type we are creating a reference to might be
9357 a typedef which is itself a reference type. In that case,
9358 we follow the reference collapsing rules in
9359 [7.1.3/8 dcl.typedef] to create the final reference type:
9361 "If a typedef TD names a type that is a reference to a type
9362 T, an attempt to create the type 'lvalue reference to cv TD'
9363 creates the type 'lvalue reference to T,' while an attempt
9364 to create the type "rvalue reference to cv TD' creates the
9367 if (VOID_TYPE_P (type))
9368 /* We already gave an error. */;
9369 else if (TREE_CODE (type) == REFERENCE_TYPE)
9371 if (declarator->u.reference.rvalue_ref)
9372 /* Leave type alone. */;
9374 type = cp_build_reference_type (TREE_TYPE (type), false);
9377 type = cp_build_reference_type
9378 (type, declarator->u.reference.rvalue_ref);
9380 /* In C++0x, we need this check for direct reference to
9381 reference declarations, which are forbidden by
9382 [8.3.2/5 dcl.ref]. Reference to reference declarations
9383 are only allowed indirectly through typedefs and template
9384 type arguments. Example:
9386 void foo(int & &); // invalid ref-to-ref decl
9388 typedef int & int_ref;
9389 void foo(int_ref &); // valid ref-to-ref decl
9391 if (inner_declarator && inner_declarator->kind == cdk_reference)
9392 error ("cannot declare reference to %q#T, which is not "
9393 "a typedef or a template type argument", type);
9395 else if (TREE_CODE (type) == METHOD_TYPE)
9396 type = build_ptrmemfunc_type (build_pointer_type (type));
9397 else if (declarator->kind == cdk_ptrmem)
9399 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
9401 if (declarator->u.pointer.class_type == error_mark_node)
9402 /* We will already have complained. */
9403 type = error_mark_node;
9405 type = build_ptrmem_type (declarator->u.pointer.class_type,
9409 type = build_pointer_type (type);
9411 /* Process a list of type modifier keywords (such as
9412 const or volatile) that were given inside the `*' or `&'. */
9414 if (declarator->u.pointer.qualifiers)
9417 = cp_build_qualified_type (type,
9418 declarator->u.pointer.qualifiers);
9419 type_quals = cp_type_quals (type);
9432 /* We need to stabilize side-effects in VLA sizes for regular array
9433 declarations too, not just pointers to arrays. */
9434 if (type != error_mark_node && !TYPE_NAME (type)
9435 && (decl_context == NORMAL || decl_context == FIELD)
9436 && at_function_scope_p ()
9437 && variably_modified_type_p (type, NULL_TREE))
9438 stabilize_vla_size (TYPE_SIZE (type));
9440 /* A `constexpr' specifier used in an object declaration declares
9441 the object as `const'. */
9442 if (constexpr_p && innermost_code != cdk_function)
9444 if (type_quals & TYPE_QUAL_CONST)
9445 error ("both %<const%> and %<constexpr%> cannot be used here");
9446 if (type_quals & TYPE_QUAL_VOLATILE)
9447 error ("both %<volatile%> and %<constexpr%> cannot be used here");
9448 if (TREE_CODE (type) != REFERENCE_TYPE)
9450 type_quals |= TYPE_QUAL_CONST;
9451 type = cp_build_qualified_type (type, type_quals);
9455 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
9456 && TREE_CODE (type) != FUNCTION_TYPE
9457 && TREE_CODE (type) != METHOD_TYPE)
9459 error ("template-id %qD used as a declarator",
9461 unqualified_id = dname;
9464 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
9465 qualified with a class-name, turn it into a METHOD_TYPE, unless
9466 we know that the function is static. We take advantage of this
9467 opportunity to do other processing that pertains to entities
9468 explicitly declared to be class members. Note that if DECLARATOR
9469 is non-NULL, we know it is a cdk_id declarator; otherwise, we
9470 would not have exited the loop above. */
9472 && declarator->u.id.qualifying_scope
9473 && MAYBE_CLASS_TYPE_P (declarator->u.id.qualifying_scope))
9477 ctype = declarator->u.id.qualifying_scope;
9478 ctype = TYPE_MAIN_VARIANT (ctype);
9480 while (t != NULL_TREE && CLASS_TYPE_P (t))
9482 /* You're supposed to have one `template <...>' for every
9483 template class, but you don't need one for a full
9484 specialization. For example:
9486 template <class T> struct S{};
9487 template <> struct S<int> { void f(); };
9488 void S<int>::f () {}
9490 is correct; there shouldn't be a `template <>' for the
9491 definition of `S<int>::f'. */
9492 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
9493 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
9494 /* T is an explicit (not partial) specialization. All
9495 containing classes must therefore also be explicitly
9498 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
9499 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
9500 template_count += 1;
9502 t = TYPE_MAIN_DECL (t);
9503 t = DECL_CONTEXT (t);
9506 if (ctype == current_class_type)
9510 permerror (input_location, "member functions are implicitly friends of their class");
9514 permerror (declarator->id_loc,
9515 "extra qualification %<%T::%> on member %qs",
9518 else if (/* If the qualifying type is already complete, then we
9519 can skip the following checks. */
9520 !COMPLETE_TYPE_P (ctype)
9521 && (/* If the function is being defined, then
9522 qualifying type must certainly be complete. */
9524 /* A friend declaration of "T::f" is OK, even if
9525 "T" is a template parameter. But, if this
9526 function is not a friend, the qualifying type
9528 || (!friendp && !CLASS_TYPE_P (ctype))
9529 /* For a declaration, the type need not be
9530 complete, if either it is dependent (since there
9531 is no meaningful definition of complete in that
9532 case) or the qualifying class is currently being
9534 || !(dependent_type_p (ctype)
9535 || currently_open_class (ctype)))
9536 /* Check that the qualifying type is complete. */
9537 && !complete_type_or_else (ctype, NULL_TREE))
9538 return error_mark_node;
9539 else if (TREE_CODE (type) == FUNCTION_TYPE)
9541 if (current_class_type
9542 && (!friendp || funcdef_flag))
9545 ? G_("cannot define member function %<%T::%s%> "
9547 : G_("cannot declare member function %<%T::%s%> "
9549 ctype, name, current_class_type);
9550 return error_mark_node;
9553 else if (declspecs->specs[(int)ds_typedef]
9554 && current_class_type)
9556 error ("cannot declare member %<%T::%s%> within %qT",
9557 ctype, name, current_class_type);
9558 return error_mark_node;
9562 if (ctype == NULL_TREE && decl_context == FIELD && friendp == 0)
9563 ctype = current_class_type;
9565 /* Now TYPE has the actual type. */
9570 *attrlist = chainon (returned_attrs, *attrlist);
9572 attrlist = &returned_attrs;
9575 /* Handle parameter packs. */
9576 if (parameter_pack_p)
9578 if (decl_context == PARM)
9579 /* Turn the type into a pack expansion.*/
9580 type = make_pack_expansion (type);
9582 error ("non-parameter %qs cannot be a parameter pack", name);
9585 /* Did array size calculations overflow? */
9587 if (TREE_CODE (type) == ARRAY_TYPE
9588 && COMPLETE_TYPE_P (type)
9589 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9590 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9592 error ("size of array %qs is too large", name);
9593 /* If we proceed with the array type as it is, we'll eventually
9594 crash in tree_low_cst(). */
9595 type = error_mark_node;
9598 if ((decl_context == FIELD || decl_context == PARM)
9599 && !processing_template_decl
9600 && variably_modified_type_p (type, NULL_TREE))
9602 if (decl_context == FIELD)
9603 error ("data member may not have variably modified type %qT", type);
9605 error ("parameter may not have variably modified type %qT", type);
9606 type = error_mark_node;
9609 if (explicitp == 1 || (explicitp && friendp))
9611 /* [dcl.fct.spec] The explicit specifier shall only be used in
9612 declarations of constructors within a class definition. */
9613 error ("only declarations of constructors can be %<explicit%>");
9617 if (storage_class == sc_mutable)
9619 if (decl_context != FIELD || friendp)
9621 error ("non-member %qs cannot be declared %<mutable%>", name);
9622 storage_class = sc_none;
9624 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9626 error ("non-object member %qs cannot be declared %<mutable%>", name);
9627 storage_class = sc_none;
9629 else if (TREE_CODE (type) == FUNCTION_TYPE
9630 || TREE_CODE (type) == METHOD_TYPE)
9632 error ("function %qs cannot be declared %<mutable%>", name);
9633 storage_class = sc_none;
9637 error ("static %qs cannot be declared %<mutable%>", name);
9638 storage_class = sc_none;
9640 else if (type_quals & TYPE_QUAL_CONST)
9642 error ("const %qs cannot be declared %<mutable%>", name);
9643 storage_class = sc_none;
9645 else if (TREE_CODE (type) == REFERENCE_TYPE)
9647 permerror (input_location, "reference %qs cannot be declared "
9648 "%<mutable%>", name);
9649 storage_class = sc_none;
9653 /* If this is declaring a typedef name, return a TYPE_DECL. */
9654 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9658 /* Note that the grammar rejects storage classes
9659 in typenames, fields or parameters. */
9660 if (current_lang_name == lang_name_java)
9661 TYPE_FOR_JAVA (type) = 1;
9663 /* This declaration:
9665 typedef void f(int) const;
9667 declares a function type which is not a member of any
9668 particular class, but which is cv-qualified; for
9669 example "f S::*" declares a pointer to a const-qualified
9670 member function of S. We record the cv-qualification in the
9672 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9674 type = apply_memfn_quals (type, memfn_quals);
9676 /* We have now dealt with these qualifiers. */
9677 memfn_quals = TYPE_UNQUALIFIED;
9680 if (type_uses_auto (type))
9682 error ("typedef declared %<auto%>");
9683 type = error_mark_node;
9686 if (decl_context == FIELD)
9687 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9689 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9690 if (id_declarator && declarator->u.id.qualifying_scope) {
9691 error_at (DECL_SOURCE_LOCATION (decl),
9692 "typedef name may not be a nested-name-specifier");
9693 TREE_TYPE (decl) = error_mark_node;
9696 if (decl_context != FIELD)
9698 if (!current_function_decl)
9699 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9700 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9701 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9702 (current_function_decl)))
9703 /* The TYPE_DECL is "abstract" because there will be
9704 clones of this constructor/destructor, and there will
9705 be copies of this TYPE_DECL generated in those
9707 DECL_ABSTRACT (decl) = 1;
9709 else if (constructor_name_p (unqualified_id, current_class_type))
9710 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9711 "as enclosing class",
9714 /* If the user declares "typedef struct {...} foo" then the
9715 struct will have an anonymous name. Fill that name in now.
9716 Nothing can refer to it, so nothing needs know about the name
9718 if (type != error_mark_node
9721 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9722 && TYPE_ANONYMOUS_P (type)
9723 && declspecs->type_definition_p
9724 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9728 /* Replace the anonymous name with the real name everywhere. */
9729 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9731 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9732 /* We do not rename the debug info representing the
9733 anonymous tagged type because the standard says in
9734 [dcl.typedef] that the naming applies only for
9735 linkage purposes. */
9736 /*debug_hooks->set_name (t, decl);*/
9737 TYPE_NAME (t) = decl;
9740 if (TYPE_LANG_SPECIFIC (type))
9741 TYPE_WAS_ANONYMOUS (type) = 1;
9743 /* If this is a typedef within a template class, the nested
9744 type is a (non-primary) template. The name for the
9745 template needs updating as well. */
9746 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9747 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9748 = TYPE_IDENTIFIER (type);
9750 /* Adjust linkage now that we aren't anonymous anymore. */
9751 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9752 determine_visibility (TYPE_MAIN_DECL (type));
9754 /* FIXME remangle member functions; member functions of a
9755 type with external linkage have external linkage. */
9759 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9760 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9762 bad_specifiers (decl, BSP_TYPE, virtualp,
9763 memfn_quals != TYPE_UNQUALIFIED,
9764 inlinep, friendp, raises != NULL_TREE);
9766 if (declspecs->specs[(int)ds_alias])
9767 /* Acknowledge that this was written:
9768 `using analias = atype;'. */
9769 TYPE_DECL_ALIAS_P (decl) = 1;
9774 /* Detect the case of an array type of unspecified size
9775 which came, as such, direct from a typedef name.
9776 We must copy the type, so that the array's domain can be
9777 individually set by the object's initializer. */
9779 if (type && typedef_type
9780 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9781 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9782 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9784 /* Detect where we're using a typedef of function type to declare a
9785 function. PARMS will not be set, so we must create it now. */
9787 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9789 tree decls = NULL_TREE;
9792 for (args = TYPE_ARG_TYPES (type);
9793 args && args != void_list_node;
9794 args = TREE_CHAIN (args))
9796 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9798 DECL_CHAIN (decl) = decls;
9802 parms = nreverse (decls);
9804 if (decl_context != TYPENAME)
9806 /* A cv-qualifier-seq shall only be part of the function type
9807 for a non-static member function. [8.3.5/4 dcl.fct] */
9808 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9809 && (current_class_type == NULL_TREE || staticp) )
9812 ? G_("qualified function types cannot be used to "
9813 "declare static member functions")
9814 : G_("qualified function types cannot be used to "
9815 "declare free functions"));
9816 type = TYPE_MAIN_VARIANT (type);
9819 /* The qualifiers on the function type become the qualifiers on
9820 the non-static member function. */
9821 memfn_quals |= type_memfn_quals (type);
9822 type_quals = TYPE_UNQUALIFIED;
9826 /* If this is a type name (such as, in a cast or sizeof),
9827 compute the type and return it now. */
9829 if (decl_context == TYPENAME)
9831 /* Note that the grammar rejects storage classes
9832 in typenames, fields or parameters. */
9833 if (type_quals != TYPE_UNQUALIFIED)
9834 type_quals = TYPE_UNQUALIFIED;
9836 /* Special case: "friend class foo" looks like a TYPENAME context. */
9839 if (type_quals != TYPE_UNQUALIFIED)
9841 error ("type qualifiers specified for friend class declaration");
9842 type_quals = TYPE_UNQUALIFIED;
9846 error ("%<inline%> specified for friend class declaration");
9852 /* Don't allow friend declaration without a class-key. */
9853 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9854 permerror (input_location, "template parameters cannot be friends");
9855 else if (TREE_CODE (type) == TYPENAME_TYPE)
9856 permerror (input_location, "friend declaration requires class-key, "
9857 "i.e. %<friend class %T::%D%>",
9858 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9860 permerror (input_location, "friend declaration requires class-key, "
9861 "i.e. %<friend %#T%>",
9865 /* Only try to do this stuff if we didn't already give up. */
9866 if (type != integer_type_node)
9868 /* A friendly class? */
9869 if (current_class_type)
9870 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9873 error ("trying to make class %qT a friend of global scope",
9876 type = void_type_node;
9879 else if (memfn_quals)
9881 if (ctype == NULL_TREE
9882 && TREE_CODE (type) == METHOD_TYPE)
9883 ctype = TYPE_METHOD_BASETYPE (type);
9886 type = build_memfn_type (type, ctype, memfn_quals);
9887 /* Core issue #547: need to allow this in template type args. */
9888 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9889 type = apply_memfn_quals (type, memfn_quals);
9891 error ("invalid qualifiers on non-member function type");
9896 else if (unqualified_id == NULL_TREE && decl_context != PARM
9897 && decl_context != CATCHPARM
9898 && TREE_CODE (type) != UNION_TYPE
9901 error ("abstract declarator %qT used as declaration", type);
9902 return error_mark_node;
9905 /* Only functions may be declared using an operator-function-id. */
9907 && IDENTIFIER_OPNAME_P (unqualified_id)
9908 && TREE_CODE (type) != FUNCTION_TYPE
9909 && TREE_CODE (type) != METHOD_TYPE)
9911 error ("declaration of %qD as non-function", unqualified_id);
9912 return error_mark_node;
9915 /* We don't check parameter types here because we can emit a better
9916 error message later. */
9917 if (decl_context != PARM)
9919 type = check_var_type (unqualified_id, type);
9920 if (type == error_mark_node)
9921 return error_mark_node;
9924 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9925 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9927 if (decl_context == PARM || decl_context == CATCHPARM)
9929 if (ctype || in_namespace)
9930 error ("cannot use %<::%> in parameter declaration");
9932 if (type_uses_auto (type))
9934 error ("parameter declared %<auto%>");
9935 type = error_mark_node;
9938 /* A parameter declared as an array of T is really a pointer to T.
9939 One declared as a function is really a pointer to a function.
9940 One declared as a member is really a pointer to member. */
9942 if (TREE_CODE (type) == ARRAY_TYPE)
9944 /* Transfer const-ness of array into that of type pointed to. */
9945 type = build_pointer_type (TREE_TYPE (type));
9946 type_quals = TYPE_UNQUALIFIED;
9948 else if (TREE_CODE (type) == FUNCTION_TYPE)
9949 type = build_pointer_type (type);
9952 if (ctype && TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9953 && !NEW_DELETE_OPNAME_P (unqualified_id))
9955 cp_cv_quals real_quals = memfn_quals;
9956 if (constexpr_p && sfk != sfk_constructor && sfk != sfk_destructor)
9957 real_quals |= TYPE_QUAL_CONST;
9958 type = build_memfn_type (type, ctype, real_quals);
9964 if (decl_context == PARM)
9966 decl = cp_build_parm_decl (unqualified_id, type);
9968 bad_specifiers (decl, BSP_PARM, virtualp,
9969 memfn_quals != TYPE_UNQUALIFIED,
9970 inlinep, friendp, raises != NULL_TREE);
9972 else if (decl_context == FIELD)
9974 if (!staticp && type_uses_auto (type))
9976 error ("non-static data member declared %<auto%>");
9977 type = error_mark_node;
9980 /* The C99 flexible array extension. */
9981 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9982 && TYPE_DOMAIN (type) == NULL_TREE)
9984 tree itype = compute_array_index_type (dname, integer_zero_node,
9985 tf_warning_or_error);
9986 type = build_cplus_array_type (TREE_TYPE (type), itype);
9989 if (type == error_mark_node)
9991 /* Happens when declaring arrays of sizes which
9992 are error_mark_node, for example. */
9995 else if (in_namespace && !friendp)
9997 /* Something like struct S { int N::j; }; */
9998 error ("invalid use of %<::%>");
9999 return error_mark_node;
10001 else if (TREE_CODE (type) == FUNCTION_TYPE
10002 || TREE_CODE (type) == METHOD_TYPE)
10005 tree function_context;
10009 /* This should never happen in pure C++ (the check
10010 could be an assert). It could happen in
10011 Objective-C++ if someone writes invalid code that
10012 uses a function declaration for an instance
10013 variable or property (instance variables and
10014 properties are parsed as FIELD_DECLs, but they are
10015 part of an Objective-C class, not a C++ class).
10016 That code is invalid and is caught by this
10020 error ("declaration of function %qD in invalid context",
10022 return error_mark_node;
10025 /* ``A union may [ ... ] not [ have ] virtual functions.''
10027 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
10029 error ("function %qD declared virtual inside a union",
10031 return error_mark_node;
10034 if (NEW_DELETE_OPNAME_P (unqualified_id))
10038 error ("%qD cannot be declared virtual, since it "
10039 "is always static",
10046 /* Check that the name used for a destructor makes sense. */
10047 if (sfk == sfk_destructor)
10049 tree uqname = id_declarator->u.id.unqualified_name;
10053 gcc_assert (friendp);
10054 error ("expected qualified name in friend declaration "
10055 "for destructor %qD", uqname);
10056 return error_mark_node;
10059 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
10061 error ("declaration of %qD as member of %qT",
10063 return error_mark_node;
10067 error ("a destructor cannot be %<constexpr%>");
10068 return error_mark_node;
10071 else if (sfk == sfk_constructor && friendp && !ctype)
10073 error ("expected qualified name in friend declaration "
10074 "for constructor %qD",
10075 id_declarator->u.id.unqualified_name);
10076 return error_mark_node;
10079 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
10080 function_context = (ctype != NULL_TREE) ?
10081 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
10082 publicp = (! friendp || ! staticp)
10083 && function_context == NULL_TREE;
10084 decl = grokfndecl (ctype, type,
10085 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
10086 ? unqualified_id : dname,
10089 virtualp, flags, memfn_quals, raises,
10090 friendp ? -1 : 0, friendp, publicp,
10091 inlinep | (2 * constexpr_p),
10093 funcdef_flag, template_count, in_namespace,
10094 attrlist, declarator->id_loc);
10095 decl = set_virt_specifiers (decl, virt_specifiers);
10096 if (decl == NULL_TREE)
10097 return error_mark_node;
10099 /* This clobbers the attrs stored in `decl' from `attrlist'. */
10100 /* The decl and setting of decl_attr is also turned off. */
10101 decl = build_decl_attribute_variant (decl, decl_attr);
10104 /* [class.conv.ctor]
10106 A constructor declared without the function-specifier
10107 explicit that can be called with a single parameter
10108 specifies a conversion from the type of its first
10109 parameter to the type of its class. Such a constructor
10110 is called a converting constructor. */
10111 if (explicitp == 2)
10112 DECL_NONCONVERTING_P (decl) = 1;
10114 else if (!staticp && !dependent_type_p (type)
10115 && !COMPLETE_TYPE_P (complete_type (type))
10116 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
10118 if (unqualified_id)
10119 error ("field %qD has incomplete type", unqualified_id);
10121 error ("name %qT has incomplete type", type);
10123 /* If we're instantiating a template, tell them which
10124 instantiation made the field's type be incomplete. */
10125 if (current_class_type
10126 && TYPE_NAME (current_class_type)
10127 && IDENTIFIER_TEMPLATE (current_class_name)
10129 && declspecs->type == type)
10130 error (" in instantiation of template %qT",
10131 current_class_type);
10133 return error_mark_node;
10139 error ("%qE is neither function nor member function; "
10140 "cannot be declared friend", unqualified_id);
10148 /* Friends are treated specially. */
10149 if (ctype == current_class_type)
10150 ; /* We already issued a permerror. */
10151 else if (decl && DECL_NAME (decl))
10153 if (template_class_depth (current_class_type) == 0)
10155 decl = check_explicit_specialization
10156 (unqualified_id, decl, template_count,
10157 2 * funcdef_flag + 4);
10158 if (decl == error_mark_node)
10159 return error_mark_node;
10162 decl = do_friend (ctype, unqualified_id, decl,
10168 return error_mark_node;
10171 /* Structure field. It may not be a function, except for C++. */
10173 if (decl == NULL_TREE)
10177 /* C++ allows static class members. All other work
10178 for this is done by grokfield. */
10179 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
10180 set_linkage_for_static_data_member (decl);
10181 /* Even if there is an in-class initialization, DECL
10182 is considered undefined until an out-of-class
10183 definition is provided. */
10184 DECL_EXTERNAL (decl) = 1;
10187 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
10189 if (constexpr_p && !initialized)
10191 error ("constexpr static data member %qD must have an "
10192 "initializer", decl);
10193 constexpr_p = false;
10200 error ("non-static data member %qE declared %<constexpr%>",
10202 constexpr_p = false;
10204 decl = build_decl (input_location,
10205 FIELD_DECL, unqualified_id, type);
10206 DECL_NONADDRESSABLE_P (decl) = bitfield;
10207 if (bitfield && !unqualified_id)
10208 TREE_NO_WARNING (decl) = 1;
10210 if (storage_class == sc_mutable)
10212 DECL_MUTABLE_P (decl) = 1;
10213 storage_class = sc_none;
10217 /* An attempt is being made to initialize a non-static
10218 member. This is new in C++11. */
10219 maybe_warn_cpp0x (CPP0X_NSDMI);
10222 bad_specifiers (decl, BSP_FIELD, virtualp,
10223 memfn_quals != TYPE_UNQUALIFIED,
10224 inlinep, friendp, raises != NULL_TREE);
10227 else if (TREE_CODE (type) == FUNCTION_TYPE
10228 || TREE_CODE (type) == METHOD_TYPE)
10230 tree original_name;
10233 if (!unqualified_id)
10234 return error_mark_node;
10236 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
10237 original_name = dname;
10239 original_name = unqualified_id;
10241 if (storage_class == sc_auto)
10242 error ("storage class %<auto%> invalid for function %qs", name);
10243 else if (storage_class == sc_register)
10244 error ("storage class %<register%> invalid for function %qs", name);
10246 error ("storage class %<__thread%> invalid for function %qs", name);
10248 if (virt_specifiers)
10249 error ("virt-specifiers in %qs not allowed outside a class definition", name);
10250 /* Function declaration not at top level.
10251 Storage classes other than `extern' are not allowed
10252 and `extern' makes no difference. */
10253 if (! toplevel_bindings_p ()
10254 && (storage_class == sc_static
10255 || declspecs->specs[(int)ds_inline])
10258 if (storage_class == sc_static)
10259 pedwarn (input_location, OPT_pedantic,
10260 "%<static%> specified invalid for function %qs "
10261 "declared out of global scope", name);
10263 pedwarn (input_location, OPT_pedantic,
10264 "%<inline%> specifier invalid for function %qs "
10265 "declared out of global scope", name);
10268 if (ctype == NULL_TREE)
10272 error ("virtual non-class function %qs", name);
10275 else if (sfk == sfk_constructor
10276 || sfk == sfk_destructor)
10278 error (funcdef_flag
10279 ? G_("%qs defined in a non-class scope")
10280 : G_("%qs declared in a non-class scope"), name);
10285 /* Record presence of `static'. */
10286 publicp = (ctype != NULL_TREE
10287 || storage_class == sc_extern
10288 || storage_class != sc_static);
10290 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
10291 virtualp, flags, memfn_quals, raises,
10293 publicp, inlinep | (2 * constexpr_p), sfk,
10295 template_count, in_namespace, attrlist,
10296 declarator->id_loc);
10297 if (decl == NULL_TREE)
10298 return error_mark_node;
10302 int invalid_static = 0;
10304 /* Don't allow a static member function in a class, and forbid
10305 declaring main to be static. */
10306 if (TREE_CODE (type) == METHOD_TYPE)
10308 permerror (input_location, "cannot declare member function %qD to have "
10309 "static linkage", decl);
10310 invalid_static = 1;
10312 else if (current_function_decl)
10314 /* FIXME need arm citation */
10315 error ("cannot declare static function inside another function");
10316 invalid_static = 1;
10319 if (invalid_static)
10322 storage_class = sc_none;
10328 /* It's a variable. */
10330 /* An uninitialized decl with `extern' is a reference. */
10331 decl = grokvardecl (type, unqualified_id,
10334 (type_quals & TYPE_QUAL_CONST) != 0,
10335 ctype ? ctype : in_namespace);
10336 bad_specifiers (decl, BSP_VAR, virtualp,
10337 memfn_quals != TYPE_UNQUALIFIED,
10338 inlinep, friendp, raises != NULL_TREE);
10342 DECL_CONTEXT (decl) = ctype;
10345 permerror (input_location, "%<static%> may not be used when defining "
10346 "(as opposed to declaring) a static data member");
10348 storage_class = sc_none;
10350 if (storage_class == sc_register && TREE_STATIC (decl))
10352 error ("static member %qD declared %<register%>", decl);
10353 storage_class = sc_none;
10355 if (storage_class == sc_extern && pedantic)
10357 pedwarn (input_location, OPT_pedantic,
10358 "cannot explicitly declare member %q#D to have "
10359 "extern linkage", decl);
10360 storage_class = sc_none;
10363 else if (constexpr_p && DECL_EXTERNAL (decl))
10365 error ("declaration of constexpr variable %qD is not a definition",
10367 constexpr_p = false;
10371 if (storage_class == sc_extern && initialized && !funcdef_flag)
10373 if (toplevel_bindings_p ())
10375 /* It's common practice (and completely valid) to have a const
10376 be initialized and declared extern. */
10377 if (!(type_quals & TYPE_QUAL_CONST))
10378 warning (0, "%qs initialized and declared %<extern%>", name);
10382 error ("%qs has both %<extern%> and initializer", name);
10383 return error_mark_node;
10387 /* Record `register' declaration for warnings on &
10388 and in case doing stupid register allocation. */
10390 if (storage_class == sc_register)
10391 DECL_REGISTER (decl) = 1;
10392 else if (storage_class == sc_extern)
10393 DECL_THIS_EXTERN (decl) = 1;
10394 else if (storage_class == sc_static)
10395 DECL_THIS_STATIC (decl) = 1;
10397 /* Set constexpr flag on vars (functions got it in grokfndecl). */
10398 if (constexpr_p && TREE_CODE (decl) == VAR_DECL)
10399 DECL_DECLARED_CONSTEXPR_P (decl) = true;
10401 /* Record constancy and volatility on the DECL itself . There's
10402 no need to do this when processing a template; we'll do this
10403 for the instantiated declaration based on the type of DECL. */
10404 if (!processing_template_decl)
10405 cp_apply_type_quals_to_decl (type_quals, decl);
10411 /* Subroutine of start_function. Ensure that each of the parameter
10412 types (as listed in PARMS) is complete, as is required for a
10413 function definition. */
10416 require_complete_types_for_parms (tree parms)
10418 for (; parms; parms = DECL_CHAIN (parms))
10420 if (dependent_type_p (TREE_TYPE (parms)))
10422 if (!VOID_TYPE_P (TREE_TYPE (parms))
10423 && complete_type_or_else (TREE_TYPE (parms), parms))
10425 relayout_decl (parms);
10426 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
10429 /* grokparms or complete_type_or_else will have already issued
10431 TREE_TYPE (parms) = error_mark_node;
10435 /* Returns nonzero if T is a local variable. */
10438 local_variable_p (const_tree t)
10440 if ((TREE_CODE (t) == VAR_DECL
10441 /* A VAR_DECL with a context that is a _TYPE is a static data
10443 && !TYPE_P (CP_DECL_CONTEXT (t))
10444 /* Any other non-local variable must be at namespace scope. */
10445 && !DECL_NAMESPACE_SCOPE_P (t))
10446 || (TREE_CODE (t) == PARM_DECL))
10452 /* Like local_variable_p, but suitable for use as a tree-walking
10456 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
10457 void *data ATTRIBUTE_UNUSED)
10459 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
10461 else if (TYPE_P (*tp))
10462 *walk_subtrees = 0;
10468 /* Check that ARG, which is a default-argument expression for a
10469 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
10470 something goes wrong. DECL may also be a _TYPE node, rather than a
10471 DECL, if there is no DECL available. */
10474 check_default_argument (tree decl, tree arg)
10479 if (TREE_CODE (arg) == DEFAULT_ARG)
10480 /* We get a DEFAULT_ARG when looking at an in-class declaration
10481 with a default argument. Ignore the argument for now; we'll
10482 deal with it after the class is complete. */
10491 decl_type = TREE_TYPE (decl);
10493 if (arg == error_mark_node
10494 || decl == error_mark_node
10495 || TREE_TYPE (arg) == error_mark_node
10496 || decl_type == error_mark_node)
10497 /* Something already went wrong. There's no need to check
10499 return error_mark_node;
10501 /* [dcl.fct.default]
10503 A default argument expression is implicitly converted to the
10505 if (!TREE_TYPE (arg)
10506 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
10509 error ("default argument for %q#D has type %qT",
10510 decl, TREE_TYPE (arg));
10512 error ("default argument for parameter of type %qT has type %qT",
10513 decl_type, TREE_TYPE (arg));
10515 return error_mark_node;
10518 /* [dcl.fct.default]
10520 Local variables shall not be used in default argument
10523 The keyword `this' shall not be used in a default argument of a
10524 member function. */
10525 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
10528 error ("default argument %qE uses local variable %qD", arg, var);
10529 return error_mark_node;
10536 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
10539 type_is_deprecated (tree type)
10541 enum tree_code code;
10542 if (TREE_DEPRECATED (type))
10544 if (TYPE_NAME (type)
10545 && TREE_DEPRECATED (TYPE_NAME (type)))
10548 /* Do warn about using typedefs to a deprecated class. */
10549 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
10550 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
10552 code = TREE_CODE (type);
10554 if (code == POINTER_TYPE || code == REFERENCE_TYPE
10555 || code == OFFSET_TYPE || code == FUNCTION_TYPE
10556 || code == METHOD_TYPE || code == ARRAY_TYPE)
10557 return type_is_deprecated (TREE_TYPE (type));
10559 if (TYPE_PTRMEMFUNC_P (type))
10560 return type_is_deprecated
10561 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
10566 /* Decode the list of parameter types for a function type.
10567 Given the list of things declared inside the parens,
10568 return a list of types.
10570 If this parameter does not end with an ellipsis, we append
10573 *PARMS is set to the chain of PARM_DECLs created. */
10576 grokparms (tree parmlist, tree *parms)
10578 tree result = NULL_TREE;
10579 tree decls = NULL_TREE;
10583 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10585 tree type = NULL_TREE;
10586 tree init = TREE_PURPOSE (parm);
10587 tree decl = TREE_VALUE (parm);
10588 const char *errmsg;
10590 if (parm == void_list_node)
10593 if (! decl || TREE_TYPE (decl) == error_mark_node)
10596 type = TREE_TYPE (decl);
10597 if (VOID_TYPE_P (type))
10599 if (same_type_p (type, void_type_node)
10600 && DECL_SELF_REFERENCE_P (type)
10601 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10602 /* this is a parmlist of `(void)', which is ok. */
10604 cxx_incomplete_type_error (decl, type);
10605 /* It's not a good idea to actually create parameters of
10606 type `void'; other parts of the compiler assume that a
10607 void type terminates the parameter list. */
10608 type = error_mark_node;
10609 TREE_TYPE (decl) = error_mark_node;
10612 if (type != error_mark_node
10613 && TYPE_FOR_JAVA (type)
10614 && MAYBE_CLASS_TYPE_P (type))
10616 error ("parameter %qD has Java class type", decl);
10617 type = error_mark_node;
10618 TREE_TYPE (decl) = error_mark_node;
10622 if (type != error_mark_node
10623 && (errmsg = targetm.invalid_parameter_type (type)))
10626 type = error_mark_node;
10627 TREE_TYPE (decl) = error_mark_node;
10630 if (type != error_mark_node)
10632 if (deprecated_state != DEPRECATED_SUPPRESS)
10634 tree deptype = type_is_deprecated (type);
10636 warn_deprecated_use (deptype, NULL_TREE);
10639 /* Top-level qualifiers on the parameters are
10640 ignored for function types. */
10641 type = cp_build_qualified_type (type, 0);
10642 if (TREE_CODE (type) == METHOD_TYPE)
10644 error ("parameter %qD invalidly declared method type", decl);
10645 type = build_pointer_type (type);
10646 TREE_TYPE (decl) = type;
10648 else if (abstract_virtuals_error (decl, type))
10649 any_error = 1; /* Seems like a good idea. */
10650 else if (POINTER_TYPE_P (type))
10652 /* [dcl.fct]/6, parameter types cannot contain pointers
10653 (references) to arrays of unknown bound. */
10654 tree t = TREE_TYPE (type);
10655 int ptr = TYPE_PTR_P (type);
10659 if (TYPE_PTR_P (t))
10661 else if (TREE_CODE (t) != ARRAY_TYPE)
10663 else if (!TYPE_DOMAIN (t))
10667 if (TREE_CODE (t) == ARRAY_TYPE)
10669 ? G_("parameter %qD includes pointer to array of "
10670 "unknown bound %qT")
10671 : G_("parameter %qD includes reference to array of "
10672 "unknown bound %qT"),
10678 else if (init && !processing_template_decl)
10679 init = check_default_argument (decl, init);
10682 DECL_CHAIN (decl) = decls;
10684 result = tree_cons (init, type, result);
10686 decls = nreverse (decls);
10687 result = nreverse (result);
10689 result = chainon (result, void_list_node);
10696 /* D is a constructor or overloaded `operator='.
10698 Let T be the class in which D is declared. Then, this function
10701 -1 if D's is an ill-formed constructor or copy assignment operator
10702 whose first parameter is of type `T'.
10703 0 if D is not a copy constructor or copy assignment
10705 1 if D is a copy constructor or copy assignment operator whose
10706 first parameter is a reference to non-const qualified T.
10707 2 if D is a copy constructor or copy assignment operator whose
10708 first parameter is a reference to const qualified T.
10710 This function can be used as a predicate. Positive values indicate
10711 a copy constructor and nonzero values indicate a copy assignment
10715 copy_fn_p (const_tree d)
10721 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10723 if (TREE_CODE (d) == TEMPLATE_DECL
10724 || (DECL_TEMPLATE_INFO (d)
10725 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10726 /* Instantiations of template member functions are never copy
10727 functions. Note that member functions of templated classes are
10728 represented as template functions internally, and we must
10729 accept those as copy functions. */
10732 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10736 arg_type = TREE_VALUE (args);
10737 if (arg_type == error_mark_node)
10740 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10742 /* Pass by value copy assignment operator. */
10745 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10746 && !TYPE_REF_IS_RVALUE (arg_type)
10747 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10749 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10755 args = TREE_CHAIN (args);
10757 if (args && args != void_list_node && !TREE_PURPOSE (args))
10758 /* There are more non-optional args. */
10764 /* D is a constructor or overloaded `operator='.
10766 Let T be the class in which D is declared. Then, this function
10767 returns true when D is a move constructor or move assignment
10768 operator, false otherwise. */
10771 move_fn_p (const_tree d)
10775 bool result = false;
10777 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10779 if (cxx_dialect == cxx98)
10780 /* There are no move constructors if we are in C++98 mode. */
10783 if (TREE_CODE (d) == TEMPLATE_DECL
10784 || (DECL_TEMPLATE_INFO (d)
10785 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10786 /* Instantiations of template member functions are never copy
10787 functions. Note that member functions of templated classes are
10788 represented as template functions internally, and we must
10789 accept those as copy functions. */
10792 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10796 arg_type = TREE_VALUE (args);
10797 if (arg_type == error_mark_node)
10800 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10801 && TYPE_REF_IS_RVALUE (arg_type)
10802 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10806 args = TREE_CHAIN (args);
10808 if (args && args != void_list_node && !TREE_PURPOSE (args))
10809 /* There are more non-optional args. */
10815 /* Remember any special properties of member function DECL. */
10818 grok_special_member_properties (tree decl)
10822 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10825 class_type = DECL_CONTEXT (decl);
10826 if (DECL_CONSTRUCTOR_P (decl))
10828 int ctor = copy_fn_p (decl);
10830 if (!DECL_ARTIFICIAL (decl))
10831 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10837 A non-template constructor for class X is a copy
10838 constructor if its first parameter is of type X&, const
10839 X&, volatile X& or const volatile X&, and either there
10840 are no other parameters or else all other parameters have
10841 default arguments. */
10842 TYPE_HAS_COPY_CTOR (class_type) = 1;
10843 if (user_provided_p (decl))
10844 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10846 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10848 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10850 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10851 if (user_provided_p (decl))
10852 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10854 else if (move_fn_p (decl) && user_provided_p (decl))
10855 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10856 else if (is_list_ctor (decl))
10857 TYPE_HAS_LIST_CTOR (class_type) = 1;
10859 if (DECL_DECLARED_CONSTEXPR_P (decl)
10860 && !copy_fn_p (decl) && !move_fn_p (decl))
10861 TYPE_HAS_CONSTEXPR_CTOR (class_type) = 1;
10863 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10867 A non-template assignment operator for class X is a copy
10868 assignment operator if its parameter is of type X, X&, const
10869 X&, volatile X& or const volatile X&. */
10871 int assop = copy_fn_p (decl);
10875 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10876 if (user_provided_p (decl))
10877 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10879 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10881 else if (move_fn_p (decl) && user_provided_p (decl))
10882 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10884 /* Destructors are handled in check_methods. */
10887 /* Check a constructor DECL has the correct form. Complains
10888 if the class has a constructor of the form X(X). */
10891 grok_ctor_properties (const_tree ctype, const_tree decl)
10893 int ctor_parm = copy_fn_p (decl);
10899 A declaration of a constructor for a class X is ill-formed if
10900 its first parameter is of type (optionally cv-qualified) X
10901 and either there are no other parameters or else all other
10902 parameters have default arguments.
10904 We *don't* complain about member template instantiations that
10905 have this form, though; they can occur as we try to decide
10906 what constructor to use during overload resolution. Since
10907 overload resolution will never prefer such a constructor to
10908 the non-template copy constructor (which is either explicitly
10909 or implicitly defined), there's no need to worry about their
10910 existence. Theoretically, they should never even be
10911 instantiated, but that's hard to forestall. */
10912 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10920 /* An operator with this code is unary, but can also be binary. */
10923 ambi_op_p (enum tree_code code)
10925 return (code == INDIRECT_REF
10926 || code == ADDR_EXPR
10927 || code == UNARY_PLUS_EXPR
10928 || code == NEGATE_EXPR
10929 || code == PREINCREMENT_EXPR
10930 || code == PREDECREMENT_EXPR);
10933 /* An operator with this name can only be unary. */
10936 unary_op_p (enum tree_code code)
10938 return (code == TRUTH_NOT_EXPR
10939 || code == BIT_NOT_EXPR
10940 || code == COMPONENT_REF
10941 || code == TYPE_EXPR);
10944 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10945 errors are issued for invalid declarations. */
10948 grok_op_properties (tree decl, bool complain)
10950 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10952 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10953 tree name = DECL_NAME (decl);
10954 enum tree_code operator_code;
10959 /* Count the number of arguments and check for ellipsis. */
10960 for (argtype = argtypes, arity = 0;
10961 argtype && argtype != void_list_node;
10962 argtype = TREE_CHAIN (argtype))
10964 ellipsis_p = !argtype;
10966 class_type = DECL_CONTEXT (decl);
10967 if (class_type && !CLASS_TYPE_P (class_type))
10968 class_type = NULL_TREE;
10970 if (DECL_CONV_FN_P (decl))
10971 operator_code = TYPE_EXPR;
10975 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10976 if (ansi_opname (CODE) == name) \
10978 operator_code = (CODE); \
10981 else if (ansi_assopname (CODE) == name) \
10983 operator_code = (CODE); \
10984 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10988 #include "operators.def"
10989 #undef DEF_OPERATOR
10991 gcc_unreachable ();
10994 gcc_assert (operator_code != MAX_TREE_CODES);
10995 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10998 switch (operator_code)
11001 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
11005 TYPE_GETS_DELETE (class_type) |= 1;
11009 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
11012 case VEC_DELETE_EXPR:
11013 TYPE_GETS_DELETE (class_type) |= 2;
11020 /* [basic.std.dynamic.allocation]/1:
11022 A program is ill-formed if an allocation function is declared
11023 in a namespace scope other than global scope or declared static
11026 The same also holds true for deallocation functions. */
11027 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
11028 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11030 if (DECL_NAMESPACE_SCOPE_P (decl))
11032 if (CP_DECL_CONTEXT (decl) != global_namespace)
11034 error ("%qD may not be declared within a namespace", decl);
11037 else if (!TREE_PUBLIC (decl))
11039 error ("%qD may not be declared as static", decl);
11045 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
11047 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
11048 DECL_IS_OPERATOR_NEW (decl) = 1;
11050 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
11051 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
11054 /* An operator function must either be a non-static member function
11055 or have at least one parameter of a class, a reference to a class,
11056 an enumeration, or a reference to an enumeration. 13.4.0.6 */
11057 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
11059 if (operator_code == TYPE_EXPR
11060 || operator_code == CALL_EXPR
11061 || operator_code == COMPONENT_REF
11062 || operator_code == ARRAY_REF
11063 || operator_code == NOP_EXPR)
11065 error ("%qD must be a nonstatic member function", decl);
11072 if (DECL_STATIC_FUNCTION_P (decl))
11074 error ("%qD must be either a non-static member "
11075 "function or a non-member function", decl);
11079 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
11081 tree arg = non_reference (TREE_VALUE (p));
11082 if (arg == error_mark_node)
11085 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
11086 because these checks are performed even on
11087 template functions. */
11088 if (MAYBE_CLASS_TYPE_P (arg)
11089 || TREE_CODE (arg) == ENUMERAL_TYPE)
11093 if (!p || p == void_list_node)
11096 error ("%qD must have an argument of class or "
11097 "enumerated type", decl);
11103 /* There are no restrictions on the arguments to an overloaded
11105 if (operator_code == CALL_EXPR)
11108 /* Warn about conversion operators that will never be used. */
11109 if (IDENTIFIER_TYPENAME_P (name)
11110 && ! DECL_TEMPLATE_INFO (decl)
11112 /* Warn only declaring the function; there is no need to
11113 warn again about out-of-class definitions. */
11114 && class_type == current_class_type)
11116 tree t = TREE_TYPE (name);
11117 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
11120 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
11122 if (TREE_CODE (t) == VOID_TYPE)
11123 warning (OPT_Wconversion,
11125 ? G_("conversion to a reference to void "
11126 "will never use a type conversion operator")
11127 : G_("conversion to void "
11128 "will never use a type conversion operator"));
11129 else if (class_type)
11131 if (t == class_type)
11132 warning (OPT_Wconversion,
11134 ? G_("conversion to a reference to the same type "
11135 "will never use a type conversion operator")
11136 : G_("conversion to the same type "
11137 "will never use a type conversion operator"));
11138 /* Don't force t to be complete here. */
11139 else if (MAYBE_CLASS_TYPE_P (t)
11140 && COMPLETE_TYPE_P (t)
11141 && DERIVED_FROM_P (t, class_type))
11142 warning (OPT_Wconversion,
11144 ? G_("conversion to a reference to a base class "
11145 "will never use a type conversion operator")
11146 : G_("conversion to a base class "
11147 "will never use a type conversion operator"));
11152 if (operator_code == COND_EXPR)
11155 error ("ISO C++ prohibits overloading operator ?:");
11158 else if (ellipsis_p)
11160 error ("%qD must not have variable number of arguments", decl);
11163 else if (ambi_op_p (operator_code))
11166 /* We pick the one-argument operator codes by default, so
11167 we don't have to change anything. */
11169 else if (arity == 2)
11171 /* If we thought this was a unary operator, we now know
11172 it to be a binary operator. */
11173 switch (operator_code)
11176 operator_code = MULT_EXPR;
11180 operator_code = BIT_AND_EXPR;
11183 case UNARY_PLUS_EXPR:
11184 operator_code = PLUS_EXPR;
11188 operator_code = MINUS_EXPR;
11191 case PREINCREMENT_EXPR:
11192 operator_code = POSTINCREMENT_EXPR;
11195 case PREDECREMENT_EXPR:
11196 operator_code = POSTDECREMENT_EXPR;
11200 gcc_unreachable ();
11203 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
11205 if ((operator_code == POSTINCREMENT_EXPR
11206 || operator_code == POSTDECREMENT_EXPR)
11207 && ! processing_template_decl
11208 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
11211 error ("postfix %qD must take %<int%> as its argument",
11214 error ("postfix %qD must take %<int%> as its second "
11222 error ("%qD must take either zero or one argument", decl);
11224 error ("%qD must take either one or two arguments", decl);
11228 /* More Effective C++ rule 6. */
11230 && (operator_code == POSTINCREMENT_EXPR
11231 || operator_code == POSTDECREMENT_EXPR
11232 || operator_code == PREINCREMENT_EXPR
11233 || operator_code == PREDECREMENT_EXPR))
11235 tree arg = TREE_VALUE (argtypes);
11236 tree ret = TREE_TYPE (TREE_TYPE (decl));
11237 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
11238 arg = TREE_TYPE (arg);
11239 arg = TYPE_MAIN_VARIANT (arg);
11240 if (operator_code == PREINCREMENT_EXPR
11241 || operator_code == PREDECREMENT_EXPR)
11243 if (TREE_CODE (ret) != REFERENCE_TYPE
11244 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
11246 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
11247 build_reference_type (arg));
11251 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
11252 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
11256 else if (unary_op_p (operator_code))
11261 error ("%qD must take %<void%>", decl);
11263 error ("%qD must take exactly one argument", decl);
11267 else /* if (binary_op_p (operator_code)) */
11272 error ("%qD must take exactly one argument", decl);
11274 error ("%qD must take exactly two arguments", decl);
11278 /* More Effective C++ rule 7. */
11280 && (operator_code == TRUTH_ANDIF_EXPR
11281 || operator_code == TRUTH_ORIF_EXPR
11282 || operator_code == COMPOUND_EXPR))
11283 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
11287 /* Effective C++ rule 23. */
11290 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
11291 && (operator_code == PLUS_EXPR
11292 || operator_code == MINUS_EXPR
11293 || operator_code == TRUNC_DIV_EXPR
11294 || operator_code == MULT_EXPR
11295 || operator_code == TRUNC_MOD_EXPR)
11296 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
11297 warning (OPT_Weffc__, "%qD should return by value", decl);
11299 /* [over.oper]/8 */
11300 for (; argtypes && argtypes != void_list_node;
11301 argtypes = TREE_CHAIN (argtypes))
11302 if (TREE_PURPOSE (argtypes))
11304 TREE_PURPOSE (argtypes) = NULL_TREE;
11305 if (operator_code == POSTINCREMENT_EXPR
11306 || operator_code == POSTDECREMENT_EXPR)
11308 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
11313 error ("%qD cannot have default arguments", decl);
11321 /* Return a string giving the keyword associate with CODE. */
11323 static const char *
11324 tag_name (enum tag_types code)
11336 case typename_type:
11339 gcc_unreachable ();
11343 /* Name lookup in an elaborated-type-specifier (after the keyword
11344 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
11345 elaborated-type-specifier is invalid, issue a diagnostic and return
11346 error_mark_node; otherwise, return the *_TYPE to which it referred.
11347 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
11350 check_elaborated_type_specifier (enum tag_types tag_code,
11352 bool allow_template_p)
11356 if (decl == error_mark_node)
11357 return error_mark_node;
11361 struct S { struct S *p; };
11363 name lookup will find the TYPE_DECL for the implicit "S::S"
11364 typedef. Adjust for that here. */
11365 if (DECL_SELF_REFERENCE_P (decl))
11366 decl = TYPE_NAME (TREE_TYPE (decl));
11368 type = TREE_TYPE (decl);
11370 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
11371 is false for this case as well. */
11372 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
11374 error ("using template type parameter %qT after %qs",
11375 type, tag_name (tag_code));
11376 return error_mark_node;
11378 /* Accept bound template template parameters. */
11379 else if (allow_template_p
11380 && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
11384 If the identifier resolves to a typedef-name or the
11385 simple-template-id resolves to an alias template
11386 specialization, the elaborated-type-specifier is ill-formed.
11388 In other words, the only legitimate declaration to use in the
11389 elaborated type specifier is the implicit typedef created when
11390 the type is declared. */
11391 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
11392 && !DECL_SELF_REFERENCE_P (decl)
11393 && tag_code != typename_type)
11395 if (alias_template_specialization_p (type))
11396 error ("using alias template specialization %qT after %qs",
11397 type, tag_name (tag_code));
11399 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
11400 inform (DECL_SOURCE_LOCATION (decl),
11401 "%qD has a previous declaration here", decl);
11402 return error_mark_node;
11404 else if (TREE_CODE (type) != RECORD_TYPE
11405 && TREE_CODE (type) != UNION_TYPE
11406 && tag_code != enum_type
11407 && tag_code != typename_type)
11409 error ("%qT referred to as %qs", type, tag_name (tag_code));
11410 error ("%q+T has a previous declaration here", type);
11411 return error_mark_node;
11413 else if (TREE_CODE (type) != ENUMERAL_TYPE
11414 && tag_code == enum_type)
11416 error ("%qT referred to as enum", type);
11417 error ("%q+T has a previous declaration here", type);
11418 return error_mark_node;
11420 else if (!allow_template_p
11421 && TREE_CODE (type) == RECORD_TYPE
11422 && CLASSTYPE_IS_TEMPLATE (type))
11424 /* If a class template appears as elaborated type specifier
11425 without a template header such as:
11427 template <class T> class C {};
11428 void f(class C); // No template header here
11430 then the required template argument is missing. */
11431 error ("template argument required for %<%s %T%>",
11432 tag_name (tag_code),
11433 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
11434 return error_mark_node;
11440 /* Lookup NAME in elaborate type specifier in scope according to
11441 SCOPE and issue diagnostics if necessary.
11442 Return *_TYPE node upon success, NULL_TREE when the NAME is not
11443 found, and ERROR_MARK_NODE for type error. */
11446 lookup_and_check_tag (enum tag_types tag_code, tree name,
11447 tag_scope scope, bool template_header_p)
11451 if (scope == ts_global)
11453 /* First try ordinary name lookup, ignoring hidden class name
11454 injected via friend declaration. */
11455 decl = lookup_name_prefer_type (name, 2);
11456 /* If that fails, the name will be placed in the smallest
11457 non-class, non-function-prototype scope according to 3.3.1/5.
11458 We may already have a hidden name declared as friend in this
11459 scope. So lookup again but not ignoring hidden names.
11460 If we find one, that name will be made visible rather than
11461 creating a new tag. */
11463 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
11466 decl = lookup_type_scope (name, scope);
11468 if (decl && DECL_CLASS_TEMPLATE_P (decl))
11469 decl = DECL_TEMPLATE_RESULT (decl);
11471 if (decl && TREE_CODE (decl) == TYPE_DECL)
11473 /* Look for invalid nested type:
11477 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
11479 error ("%qD has the same name as the class in which it is "
11482 return error_mark_node;
11485 /* Two cases we need to consider when deciding if a class
11486 template is allowed as an elaborated type specifier:
11487 1. It is a self reference to its own class.
11488 2. It comes with a template header.
11492 template <class T> class C {
11493 class C *c1; // DECL_SELF_REFERENCE_P is true
11496 template <class U> class C; // template_header_p is true
11497 template <class T> class C<T>::D {
11498 class C *c2; // DECL_SELF_REFERENCE_P is true
11501 t = check_elaborated_type_specifier (tag_code,
11504 | DECL_SELF_REFERENCE_P (decl));
11507 else if (decl && TREE_CODE (decl) == TREE_LIST)
11509 error ("reference to %qD is ambiguous", name);
11510 print_candidates (decl);
11511 return error_mark_node;
11517 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
11518 Define the tag as a forward-reference if it is not defined.
11520 If a declaration is given, process it here, and report an error if
11521 multiple declarations are not identical.
11523 SCOPE is TS_CURRENT when this is also a definition. Only look in
11524 the current frame for the name (since C++ allows new names in any
11525 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
11526 declaration. Only look beginning from the current scope outward up
11527 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
11529 TEMPLATE_HEADER_P is true when this declaration is preceded by
11530 a set of template parameters. */
11533 xref_tag_1 (enum tag_types tag_code, tree name,
11534 tag_scope scope, bool template_header_p)
11536 enum tree_code code;
11538 tree context = NULL_TREE;
11540 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11546 code = RECORD_TYPE;
11552 code = ENUMERAL_TYPE;
11555 gcc_unreachable ();
11558 /* In case of anonymous name, xref_tag is only called to
11559 make type node and push name. Name lookup is not required. */
11560 if (ANON_AGGRNAME_P (name))
11563 t = lookup_and_check_tag (tag_code, name,
11564 scope, template_header_p);
11566 if (t == error_mark_node)
11567 return error_mark_node;
11569 if (scope != ts_current && t && current_class_type
11570 && template_class_depth (current_class_type)
11571 && template_header_p)
11573 /* Since SCOPE is not TS_CURRENT, we are not looking at a
11574 definition of this tag. Since, in addition, we are currently
11575 processing a (member) template declaration of a template
11576 class, we must be very careful; consider:
11583 { template <class V>
11584 friend struct S1; };
11586 Here, the S2::S1 declaration should not be confused with the
11587 outer declaration. In particular, the inner version should
11588 have a template parameter of level 2, not level 1. This
11589 would be particularly important if the member declaration
11592 template <class V = U> friend struct S1;
11594 say, when we should tsubst into `U' when instantiating
11595 S2. On the other hand, when presented with:
11605 we must find the inner binding eventually. We
11606 accomplish this by making sure that the new type we
11607 create to represent this declaration has the right
11609 context = TYPE_CONTEXT (t);
11615 /* If no such tag is yet defined, create a forward-reference node
11616 and record it as the "definition".
11617 When a real declaration of this type is found,
11618 the forward-reference will be altered into a real type. */
11619 if (code == ENUMERAL_TYPE)
11621 error ("use of enum %q#D without previous declaration", name);
11622 return error_mark_node;
11626 t = make_class_type (code);
11627 TYPE_CONTEXT (t) = context;
11628 t = pushtag (name, t, scope);
11633 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11635 if (!redeclare_class_template (t, current_template_parms))
11636 return error_mark_node;
11638 else if (!processing_template_decl
11639 && CLASS_TYPE_P (t)
11640 && CLASSTYPE_IS_TEMPLATE (t))
11642 error ("redeclaration of %qT as a non-template", t);
11643 error ("previous declaration %q+D", t);
11644 return error_mark_node;
11647 /* Make injected friend class visible. */
11648 if (scope != ts_within_enclosing_non_class
11649 && hidden_name_p (TYPE_NAME (t)))
11651 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11652 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11654 if (TYPE_TEMPLATE_INFO (t))
11656 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11657 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11665 /* Wrapper for xref_tag_1. */
11668 xref_tag (enum tag_types tag_code, tree name,
11669 tag_scope scope, bool template_header_p)
11673 subtime = timevar_cond_start (TV_NAME_LOOKUP);
11674 ret = xref_tag_1 (tag_code, name, scope, template_header_p);
11675 timevar_cond_stop (TV_NAME_LOOKUP, subtime);
11681 xref_tag_from_type (tree old, tree id, tag_scope scope)
11683 enum tag_types tag_kind;
11685 if (TREE_CODE (old) == RECORD_TYPE)
11686 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11688 tag_kind = union_type;
11690 if (id == NULL_TREE)
11691 id = TYPE_IDENTIFIER (old);
11693 return xref_tag (tag_kind, id, scope, false);
11696 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11697 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11698 access_* node, and the TREE_VALUE is the type of the base-class.
11699 Non-NULL TREE_TYPE indicates virtual inheritance.
11701 Returns true if the binfo hierarchy was successfully created,
11702 false if an error was detected. */
11705 xref_basetypes (tree ref, tree base_list)
11708 tree binfo, base_binfo;
11709 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11710 unsigned max_bases = 0; /* Maximum direct bases. */
11712 tree default_access;
11713 tree igo_prev; /* Track Inheritance Graph Order. */
11715 if (ref == error_mark_node)
11718 /* The base of a derived class is private by default, all others are
11720 default_access = (TREE_CODE (ref) == RECORD_TYPE
11721 && CLASSTYPE_DECLARED_CLASS (ref)
11722 ? access_private_node : access_public_node);
11724 /* First, make sure that any templates in base-classes are
11725 instantiated. This ensures that if we call ourselves recursively
11726 we do not get confused about which classes are marked and which
11728 basep = &base_list;
11731 tree basetype = TREE_VALUE (*basep);
11733 if (!(processing_template_decl && uses_template_parms (basetype))
11734 && !complete_type_or_else (basetype, NULL))
11735 /* An incomplete type. Remove it from the list. */
11736 *basep = TREE_CHAIN (*basep);
11740 if (TREE_TYPE (*basep))
11742 if (CLASS_TYPE_P (basetype))
11743 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11744 basep = &TREE_CHAIN (*basep);
11748 TYPE_MARKED_P (ref) = 1;
11750 /* The binfo slot should be empty, unless this is an (ill-formed)
11752 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11754 error ("redefinition of %q#T", ref);
11758 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11760 binfo = make_tree_binfo (max_bases);
11762 TYPE_BINFO (ref) = binfo;
11763 BINFO_OFFSET (binfo) = size_zero_node;
11764 BINFO_TYPE (binfo) = ref;
11766 /* Apply base-class info set up to the variants of this type. */
11767 fixup_type_variants (ref);
11771 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11772 /* An aggregate cannot have baseclasses. */
11773 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11775 if (TREE_CODE (ref) == UNION_TYPE)
11777 error ("derived union %qT invalid", ref);
11784 if (TYPE_FOR_JAVA (ref))
11786 error ("Java class %qT cannot have multiple bases", ref);
11793 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11795 if (TYPE_FOR_JAVA (ref))
11797 error ("Java class %qT cannot have virtual bases", ref);
11802 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11804 tree access = TREE_PURPOSE (base_list);
11805 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11806 tree basetype = TREE_VALUE (base_list);
11808 if (access == access_default_node)
11809 access = default_access;
11811 if (PACK_EXPANSION_P (basetype))
11812 basetype = PACK_EXPANSION_PATTERN (basetype);
11813 if (TREE_CODE (basetype) == TYPE_DECL)
11814 basetype = TREE_TYPE (basetype);
11815 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11817 error ("base type %qT fails to be a struct or class type",
11822 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11823 TYPE_FOR_JAVA (ref) = 1;
11825 base_binfo = NULL_TREE;
11826 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11828 base_binfo = TYPE_BINFO (basetype);
11829 /* The original basetype could have been a typedef'd type. */
11830 basetype = BINFO_TYPE (base_binfo);
11832 /* Inherit flags from the base. */
11833 TYPE_HAS_NEW_OPERATOR (ref)
11834 |= TYPE_HAS_NEW_OPERATOR (basetype);
11835 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11836 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11837 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11838 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11839 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11840 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11841 CLASSTYPE_REPEATED_BASE_P (ref)
11842 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11845 /* We must do this test after we've seen through a typedef
11847 if (TYPE_MARKED_P (basetype))
11849 if (basetype == ref)
11850 error ("recursive type %qT undefined", basetype);
11852 error ("duplicate base type %qT invalid", basetype);
11856 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11857 /* Regenerate the pack expansion for the bases. */
11858 basetype = make_pack_expansion (basetype);
11860 TYPE_MARKED_P (basetype) = 1;
11862 base_binfo = copy_binfo (base_binfo, basetype, ref,
11863 &igo_prev, via_virtual);
11864 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11865 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11867 BINFO_BASE_APPEND (binfo, base_binfo);
11868 BINFO_BASE_ACCESS_APPEND (binfo, access);
11871 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11872 /* If we have space in the vbase vector, we must have shared at
11873 least one of them, and are therefore diamond shaped. */
11874 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11876 /* Unmark all the types. */
11877 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11878 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11879 TYPE_MARKED_P (ref) = 0;
11881 /* Now see if we have a repeated base type. */
11882 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11884 for (base_binfo = binfo; base_binfo;
11885 base_binfo = TREE_CHAIN (base_binfo))
11887 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11889 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11892 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11894 for (base_binfo = binfo; base_binfo;
11895 base_binfo = TREE_CHAIN (base_binfo))
11896 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11897 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11906 /* Copies the enum-related properties from type SRC to type DST.
11907 Used with the underlying type of an enum and the enum itself. */
11909 copy_type_enum (tree dst, tree src)
11911 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11912 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11913 TYPE_SIZE (dst) = TYPE_SIZE (src);
11914 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11915 SET_TYPE_MODE (dst, TYPE_MODE (src));
11916 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11917 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11918 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11919 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11922 /* Begin compiling the definition of an enumeration type.
11925 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11927 UNDERLYING_TYPE is the type that will be used as the storage for
11928 the enumeration type. This should be NULL_TREE if no storage type
11931 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11933 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11935 Returns the type object, as yet incomplete.
11936 Also records info about it so that build_enumerator
11937 may be used to declare the individual values as they are read. */
11940 start_enum (tree name, tree enumtype, tree underlying_type,
11941 bool scoped_enum_p, bool *is_new)
11943 tree prevtype = NULL_TREE;
11944 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11948 /* [C++0x dcl.enum]p5:
11950 If not explicitly specified, the underlying type of a scoped
11951 enumeration type is int. */
11952 if (!underlying_type && scoped_enum_p)
11953 underlying_type = integer_type_node;
11955 if (underlying_type)
11956 underlying_type = cv_unqualified (underlying_type);
11958 /* If this is the real definition for a previous forward reference,
11959 fill in the contents in the same object that used to be the
11960 forward reference. */
11962 enumtype = lookup_and_check_tag (enum_type, name,
11963 /*tag_scope=*/ts_current,
11964 /*template_header_p=*/false);
11966 /* In case of a template_decl, the only check that should be deferred
11967 to instantiation time is the comparison of underlying types. */
11968 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11970 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11972 error_at (input_location, "scoped/unscoped mismatch "
11973 "in enum %q#T", enumtype);
11974 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11975 "previous definition here");
11976 enumtype = error_mark_node;
11978 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11980 error_at (input_location, "underlying type mismatch "
11981 "in enum %q#T", enumtype);
11982 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11983 "previous definition here");
11984 enumtype = error_mark_node;
11986 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11987 && !dependent_type_p (underlying_type)
11988 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11989 && !same_type_p (underlying_type,
11990 ENUM_UNDERLYING_TYPE (enumtype)))
11992 error_at (input_location, "different underlying type "
11993 "in enum %q#T", enumtype);
11994 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11995 "previous definition here");
11996 underlying_type = NULL_TREE;
12000 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
12001 || processing_template_decl)
12003 /* In case of error, make a dummy enum to allow parsing to
12005 if (enumtype == error_mark_node)
12007 name = make_anon_name ();
12008 enumtype = NULL_TREE;
12011 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
12012 of an opaque enum, or an opaque enum of an already defined
12013 enumeration (C++0x only).
12014 In any other case, it'll be NULL_TREE. */
12020 prevtype = enumtype;
12022 /* Do not push the decl more than once, unless we need to
12023 compare underlying types at instantiation time */
12025 || (underlying_type
12026 && dependent_type_p (underlying_type))
12027 || (ENUM_UNDERLYING_TYPE (enumtype)
12028 && dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))))
12030 enumtype = cxx_make_type (ENUMERAL_TYPE);
12031 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
12034 enumtype = xref_tag (enum_type, name, /*tag_scope=*/ts_current,
12037 if (enumtype == error_mark_node)
12038 return error_mark_node;
12040 /* The enum is considered opaque until the opening '{' of the
12041 enumerator list. */
12042 SET_OPAQUE_ENUM_P (enumtype, true);
12043 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
12046 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
12048 if (underlying_type)
12050 if (CP_INTEGRAL_TYPE_P (underlying_type))
12052 copy_type_enum (enumtype, underlying_type);
12053 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12055 else if (dependent_type_p (underlying_type))
12056 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
12058 error ("underlying type %<%T%> of %<%T%> must be an integral type",
12059 underlying_type, enumtype);
12062 /* If into a template class, the returned enum is always the first
12063 declaration (opaque or not) seen. This way all the references to
12064 this type will be to the same declaration. The following ones are used
12065 only to check for definition errors. */
12066 if (prevtype && processing_template_decl)
12072 /* After processing and defining all the values of an enumeration type,
12073 install their decls in the enumeration type.
12074 ENUMTYPE is the type object. */
12077 finish_enum_value_list (tree enumtype)
12080 tree underlying_type;
12083 tree minnode, maxnode;
12086 bool fixed_underlying_type_p
12087 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
12089 /* We built up the VALUES in reverse order. */
12090 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
12092 /* For an enum defined in a template, just set the type of the values;
12093 all further processing is postponed until the template is
12094 instantiated. We need to set the type so that tsubst of a CONST_DECL
12096 if (processing_template_decl)
12098 for (values = TYPE_VALUES (enumtype);
12100 values = TREE_CHAIN (values))
12101 TREE_TYPE (TREE_VALUE (values)) = enumtype;
12105 /* Determine the minimum and maximum values of the enumerators. */
12106 if (TYPE_VALUES (enumtype))
12108 minnode = maxnode = NULL_TREE;
12110 for (values = TYPE_VALUES (enumtype);
12112 values = TREE_CHAIN (values))
12114 decl = TREE_VALUE (values);
12116 /* [dcl.enum]: Following the closing brace of an enum-specifier,
12117 each enumerator has the type of its enumeration. Prior to the
12118 closing brace, the type of each enumerator is the type of its
12119 initializing value. */
12120 TREE_TYPE (decl) = enumtype;
12122 /* Update the minimum and maximum values, if appropriate. */
12123 value = DECL_INITIAL (decl);
12124 if (value == error_mark_node)
12125 value = integer_zero_node;
12126 /* Figure out what the minimum and maximum values of the
12127 enumerators are. */
12129 minnode = maxnode = value;
12130 else if (tree_int_cst_lt (maxnode, value))
12132 else if (tree_int_cst_lt (value, minnode))
12139 If the enumerator-list is empty, the underlying type is as if
12140 the enumeration had a single enumerator with value 0. */
12141 minnode = maxnode = integer_zero_node;
12143 if (!fixed_underlying_type_p)
12145 /* Compute the number of bits require to represent all values of the
12146 enumeration. We must do this before the type of MINNODE and
12147 MAXNODE are transformed, since tree_int_cst_min_precision relies
12148 on the TREE_TYPE of the value it is passed. */
12149 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
12150 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
12151 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
12152 int precision = MAX (lowprec, highprec);
12154 bool use_short_enum;
12156 /* Determine the underlying type of the enumeration.
12160 The underlying type of an enumeration is an integral type that
12161 can represent all the enumerator values defined in the
12162 enumeration. It is implementation-defined which integral type is
12163 used as the underlying type for an enumeration except that the
12164 underlying type shall not be larger than int unless the value of
12165 an enumerator cannot fit in an int or unsigned int.
12167 We use "int" or an "unsigned int" as the underlying type, even if
12168 a smaller integral type would work, unless the user has
12169 explicitly requested that we use the smallest possible type. The
12170 user can request that for all enumerations with a command line
12171 flag, or for just one enumeration with an attribute. */
12173 use_short_enum = flag_short_enums
12174 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
12176 for (itk = (use_short_enum ? itk_char : itk_int);
12180 underlying_type = integer_types[itk];
12181 if (underlying_type != NULL_TREE
12182 && TYPE_PRECISION (underlying_type) >= precision
12183 && TYPE_UNSIGNED (underlying_type) == unsignedp)
12186 if (itk == itk_none)
12190 IF no integral type can represent all the enumerator values, the
12191 enumeration is ill-formed. */
12192 error ("no integral type can represent all of the enumerator values "
12193 "for %qT", enumtype);
12194 precision = TYPE_PRECISION (long_long_integer_type_node);
12195 underlying_type = integer_types[itk_unsigned_long_long];
12200 The value of sizeof() applied to an enumeration type, an object
12201 of an enumeration type, or an enumerator, is the value of sizeof()
12202 applied to the underlying type. */
12203 copy_type_enum (enumtype, underlying_type);
12205 /* Compute the minimum and maximum values for the type.
12209 For an enumeration where emin is the smallest enumerator and emax
12210 is the largest, the values of the enumeration are the values of the
12211 underlying type in the range bmin to bmax, where bmin and bmax are,
12212 respectively, the smallest and largest values of the smallest bit-
12213 field that can store emin and emax. */
12215 /* The middle-end currently assumes that types with TYPE_PRECISION
12216 narrower than their underlying type are suitably zero or sign
12217 extended to fill their mode. Similarly, it assumes that the front
12218 end assures that a value of a particular type must be within
12219 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
12221 We used to set these fields based on bmin and bmax, but that led
12222 to invalid assumptions like optimizing away bounds checking. So
12223 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
12224 TYPE_MAX_VALUE to the values for the mode above and only restrict
12225 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
12226 ENUM_UNDERLYING_TYPE (enumtype)
12227 = build_distinct_type_copy (underlying_type);
12228 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
12229 set_min_and_max_values_for_integral_type
12230 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
12232 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
12233 if (flag_strict_enums)
12234 set_min_and_max_values_for_integral_type (enumtype, precision,
12238 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
12240 /* Convert each of the enumerators to the type of the underlying
12241 type of the enumeration. */
12242 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
12244 location_t saved_location;
12246 decl = TREE_VALUE (values);
12247 saved_location = input_location;
12248 input_location = DECL_SOURCE_LOCATION (decl);
12249 if (fixed_underlying_type_p)
12250 /* If the enumeration type has a fixed underlying type, we
12251 already checked all of the enumerator values. */
12252 value = DECL_INITIAL (decl);
12254 value = perform_implicit_conversion (underlying_type,
12255 DECL_INITIAL (decl),
12256 tf_warning_or_error);
12257 input_location = saved_location;
12259 /* Do not clobber shared ints. */
12260 value = copy_node (value);
12262 TREE_TYPE (value) = enumtype;
12263 DECL_INITIAL (decl) = value;
12266 /* Fix up all variant types of this enum type. */
12267 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
12268 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
12270 /* Finish debugging output for this type. */
12271 rest_of_type_compilation (enumtype, namespace_bindings_p ());
12274 /* Finishes the enum type. This is called only the first time an
12275 enumeration is seen, be it opaque or odinary.
12276 ENUMTYPE is the type object. */
12279 finish_enum (tree enumtype)
12281 if (processing_template_decl)
12283 if (at_function_scope_p ())
12284 add_stmt (build_min (TAG_DEFN, enumtype));
12288 /* Here there should not be any variants of this type. */
12289 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
12290 && !TYPE_NEXT_VARIANT (enumtype));
12293 /* Build and install a CONST_DECL for an enumeration constant of the
12294 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
12295 LOC is the location of NAME.
12296 Assignment of sequential values by default is handled here. */
12299 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
12305 /* If the VALUE was erroneous, pretend it wasn't there; that will
12306 result in the enum being assigned the next value in sequence. */
12307 if (value == error_mark_node)
12310 /* Remove no-op casts from the value. */
12312 STRIP_TYPE_NOPS (value);
12314 if (! processing_template_decl)
12316 /* Validate and default VALUE. */
12317 if (value != NULL_TREE)
12319 value = cxx_constant_value (value);
12321 if (TREE_CODE (value) == INTEGER_CST
12322 && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
12324 value = perform_integral_promotions (value);
12328 error ("enumerator value for %qD is not an integer constant", name);
12333 /* Default based on previous value. */
12334 if (value == NULL_TREE)
12336 if (TYPE_VALUES (enumtype))
12339 unsigned HOST_WIDE_INT lo;
12343 /* C++03 7.2/4: If no initializer is specified for the first
12344 enumerator, the type is an unspecified integral
12345 type. Otherwise the type is the same as the type of the
12346 initializing value of the preceding enumerator unless the
12347 incremented value is not representable in that type, in
12348 which case the type is an unspecified integral type
12349 sufficient to contain the incremented value. */
12350 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
12351 if (error_operand_p (prev_value))
12352 value = error_mark_node;
12355 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
12356 TREE_INT_CST_HIGH (prev_value),
12361 tree type = TREE_TYPE (prev_value);
12362 bool pos = (TYPE_UNSIGNED (type) || hi >= 0);
12363 di.low = lo; di.high = hi;
12364 if (!double_int_fits_to_tree_p (type, di))
12367 for (itk = itk_int; itk != itk_none; itk++)
12369 type = integer_types[itk];
12370 if (type != NULL_TREE
12371 && (pos || !TYPE_UNSIGNED (type))
12372 && double_int_fits_to_tree_p (type, di))
12375 if (type && cxx_dialect < cxx0x
12376 && itk > itk_unsigned_long)
12377 pedwarn (input_location, OPT_Wlong_long, pos ? "\
12378 incremented enumerator value is too large for %<unsigned long%>" : "\
12379 incremented enumerator value is too large for %<long%>");
12381 if (type == NULL_TREE)
12384 value = double_int_to_tree (type, di);
12389 error ("overflow in enumeration values at %qD", name);
12390 value = error_mark_node;
12395 value = integer_zero_node;
12398 /* Remove no-op casts from the value. */
12399 STRIP_TYPE_NOPS (value);
12401 /* If the underlying type of the enum is fixed, check whether
12402 the enumerator values fits in the underlying type. If it
12403 does not fit, the program is ill-formed [C++0x dcl.enum]. */
12404 if (ENUM_UNDERLYING_TYPE (enumtype)
12406 && TREE_CODE (value) == INTEGER_CST
12407 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
12409 error ("enumerator value %E is too large for underlying type %<%T%>",
12410 value, ENUM_UNDERLYING_TYPE (enumtype));
12412 /* Silently convert the value so that we can continue. */
12413 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
12418 /* C++ associates enums with global, function, or class declarations. */
12419 context = current_scope ();
12421 /* Build the actual enumeration constant. Note that the enumeration
12422 constants have the underlying type of the enum (if it is fixed)
12423 or the type of their initializer (if the underlying type of the
12424 enum is not fixed):
12428 If the underlying type is fixed, the type of each enumerator
12429 prior to the closing brace is the underlying type; if the
12430 initializing value of an enumerator cannot be represented by
12431 the underlying type, the program is ill-formed. If the
12432 underlying type is not fixed, the type of each enumerator is
12433 the type of its initializing value.
12435 If the underlying type is not fixed, it will be computed by
12436 finish_enum and we will reset the type of this enumerator. Of
12437 course, if we're processing a template, there may be no value. */
12438 type = value ? TREE_TYPE (value) : NULL_TREE;
12440 if (context && context == current_class_type)
12441 /* This enum declaration is local to the class. We need the full
12442 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
12443 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
12445 /* It's a global enum, or it's local to a function. (Note local to
12446 a function could mean local to a class method. */
12447 decl = build_decl (loc, CONST_DECL, name, type);
12449 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
12450 TREE_CONSTANT (decl) = 1;
12451 TREE_READONLY (decl) = 1;
12452 DECL_INITIAL (decl) = value;
12454 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
12455 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
12456 on the TYPE_FIELDS list for `S'. (That's so that you can say
12457 things like `S::i' later.) */
12458 finish_member_declaration (decl);
12462 /* Add this enumeration constant to the list for this type. */
12463 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
12466 /* Look for an enumerator with the given NAME within the enumeration
12467 type ENUMTYPE. This routine is used primarily for qualified name
12468 lookup into an enumerator in C++0x, e.g.,
12470 enum class Color { Red, Green, Blue };
12472 Color color = Color::Red;
12474 Returns the value corresponding to the enumerator, or
12475 NULL_TREE if no such enumerator was found. */
12477 lookup_enumerator (tree enumtype, tree name)
12480 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
12482 e = purpose_member (name, TYPE_VALUES (enumtype));
12483 return e? TREE_VALUE (e) : NULL_TREE;
12487 /* We're defining DECL. Make sure that its type is OK. */
12490 check_function_type (tree decl, tree current_function_parms)
12492 tree fntype = TREE_TYPE (decl);
12493 tree return_type = complete_type (TREE_TYPE (fntype));
12495 /* In a function definition, arg types must be complete. */
12496 require_complete_types_for_parms (current_function_parms);
12498 if (dependent_type_p (return_type))
12500 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
12501 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
12503 tree args = TYPE_ARG_TYPES (fntype);
12505 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
12506 error ("return type %q#T is incomplete", return_type);
12508 error ("return type has Java class type %q#T", return_type);
12510 /* Make it return void instead. */
12511 if (TREE_CODE (fntype) == METHOD_TYPE)
12512 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
12514 TREE_CHAIN (args));
12516 fntype = build_function_type (void_type_node, args);
12518 = build_exception_variant (fntype,
12519 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
12520 fntype = (cp_build_type_attribute_variant
12521 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
12522 TREE_TYPE (decl) = fntype;
12525 abstract_virtuals_error (decl, TREE_TYPE (fntype));
12528 /* Create the FUNCTION_DECL for a function definition.
12529 DECLSPECS and DECLARATOR are the parts of the declaration;
12530 they describe the function's name and the type it returns,
12531 but twisted together in a fashion that parallels the syntax of C.
12533 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
12534 DECLARATOR is really the DECL for the function we are about to
12535 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
12536 indicating that the function is an inline defined in-class.
12538 This function creates a binding context for the function body
12539 as well as setting up the FUNCTION_DECL in current_function_decl.
12541 For C++, we must first check whether that datum makes any sense.
12542 For example, "class A local_a(1,2);" means that variable local_a
12543 is an aggregate of type A, which should have a constructor
12544 applied to it with the argument list [1, 2].
12546 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
12547 or may be a BLOCK if the function has been defined previously
12548 in this translation unit. On exit, DECL_INITIAL (decl1) will be
12549 error_mark_node if the function has never been defined, or
12550 a BLOCK if the function has been defined somewhere. */
12553 start_preparsed_function (tree decl1, tree attrs, int flags)
12555 tree ctype = NULL_TREE;
12558 int doing_friend = 0;
12559 cp_binding_level *bl;
12560 tree current_function_parms;
12561 struct c_fileinfo *finfo
12562 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
12563 bool honor_interface;
12565 /* Sanity check. */
12566 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
12567 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
12569 fntype = TREE_TYPE (decl1);
12570 if (TREE_CODE (fntype) == METHOD_TYPE)
12571 ctype = TYPE_METHOD_BASETYPE (fntype);
12573 /* ISO C++ 11.4/5. A friend function defined in a class is in
12574 the (lexical) scope of the class in which it is defined. */
12575 if (!ctype && DECL_FRIEND_P (decl1))
12577 ctype = DECL_FRIEND_CONTEXT (decl1);
12579 /* CTYPE could be null here if we're dealing with a template;
12580 for example, `inline friend float foo()' inside a template
12581 will have no CTYPE set. */
12582 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
12588 if (DECL_DECLARED_INLINE_P (decl1)
12589 && lookup_attribute ("noinline", attrs))
12590 warning (0, "inline function %q+D given attribute noinline", decl1);
12592 /* Handle gnu_inline attribute. */
12593 if (GNU_INLINE_P (decl1))
12595 DECL_EXTERNAL (decl1) = 1;
12596 DECL_NOT_REALLY_EXTERN (decl1) = 0;
12597 DECL_INTERFACE_KNOWN (decl1) = 1;
12598 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
12601 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
12602 /* This is a constructor, we must ensure that any default args
12603 introduced by this definition are propagated to the clones
12604 now. The clones are used directly in overload resolution. */
12605 adjust_clone_args (decl1);
12607 /* Sometimes we don't notice that a function is a static member, and
12608 build a METHOD_TYPE for it. Fix that up now. */
12609 gcc_assert (!(ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
12610 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE));
12612 /* Set up current_class_type, and enter the scope of the class, if
12615 push_nested_class (ctype);
12616 else if (DECL_STATIC_FUNCTION_P (decl1))
12617 push_nested_class (DECL_CONTEXT (decl1));
12619 /* Now that we have entered the scope of the class, we must restore
12620 the bindings for any template parameters surrounding DECL1, if it
12621 is an inline member template. (Order is important; consider the
12622 case where a template parameter has the same name as a field of
12623 the class.) It is not until after this point that
12624 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
12625 if (flags & SF_INCLASS_INLINE)
12626 maybe_begin_member_template_processing (decl1);
12628 /* Effective C++ rule 15. */
12630 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12631 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12632 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12634 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12635 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12636 if (!DECL_INITIAL (decl1))
12637 DECL_INITIAL (decl1) = error_mark_node;
12639 /* This function exists in static storage.
12640 (This does not mean `static' in the C sense!) */
12641 TREE_STATIC (decl1) = 1;
12643 /* We must call push_template_decl after current_class_type is set
12644 up. (If we are processing inline definitions after exiting a
12645 class scope, current_class_type will be NULL_TREE until set above
12646 by push_nested_class.) */
12647 if (processing_template_decl)
12649 /* FIXME: Handle error_mark_node more gracefully. */
12650 tree newdecl1 = push_template_decl (decl1);
12651 if (newdecl1 != error_mark_node)
12655 /* We are now in the scope of the function being defined. */
12656 current_function_decl = decl1;
12658 /* Save the parm names or decls from this function's declarator
12659 where store_parm_decls will find them. */
12660 current_function_parms = DECL_ARGUMENTS (decl1);
12662 /* Make sure the parameter and return types are reasonable. When
12663 you declare a function, these types can be incomplete, but they
12664 must be complete when you define the function. */
12665 check_function_type (decl1, current_function_parms);
12667 /* Build the return declaration for the function. */
12668 restype = TREE_TYPE (fntype);
12669 if (DECL_RESULT (decl1) == NULL_TREE)
12673 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12674 DECL_ARTIFICIAL (resdecl) = 1;
12675 DECL_IGNORED_P (resdecl) = 1;
12676 DECL_RESULT (decl1) = resdecl;
12678 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12681 /* Let the user know we're compiling this function. */
12682 announce_function (decl1);
12684 /* Record the decl so that the function name is defined.
12685 If we already have a decl for this name, and it is a FUNCTION_DECL,
12686 use the old decl. */
12687 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12689 /* A specialization is not used to guide overload resolution. */
12690 if (!DECL_FUNCTION_MEMBER_P (decl1)
12691 && !(DECL_USE_TEMPLATE (decl1) &&
12692 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12694 tree olddecl = pushdecl (decl1);
12696 if (olddecl == error_mark_node)
12697 /* If something went wrong when registering the declaration,
12698 use DECL1; we have to have a FUNCTION_DECL to use when
12699 parsing the body of the function. */
12703 /* Otherwise, OLDDECL is either a previous declaration
12704 of the same function or DECL1 itself. */
12706 if (warn_missing_declarations
12707 && olddecl == decl1
12708 && !DECL_MAIN_P (decl1)
12709 && TREE_PUBLIC (decl1)
12710 && !DECL_DECLARED_INLINE_P (decl1))
12714 /* Check whether DECL1 is in an anonymous
12716 for (context = DECL_CONTEXT (decl1);
12718 context = DECL_CONTEXT (context))
12720 if (TREE_CODE (context) == NAMESPACE_DECL
12721 && DECL_NAME (context) == NULL_TREE)
12725 if (context == NULL)
12726 warning (OPT_Wmissing_declarations,
12727 "no previous declaration for %q+D", decl1);
12735 /* We need to set the DECL_CONTEXT. */
12736 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12737 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12739 fntype = TREE_TYPE (decl1);
12741 /* If #pragma weak applies, mark the decl appropriately now.
12742 The pragma only applies to global functions. Because
12743 determining whether or not the #pragma applies involves
12744 computing the mangled name for the declaration, we cannot
12745 apply the pragma until after we have merged this declaration
12746 with any previous declarations; if the original declaration
12747 has a linkage specification, that specification applies to
12748 the definition as well, and may affect the mangled name. */
12749 if (DECL_FILE_SCOPE_P (decl1))
12750 maybe_apply_pragma_weak (decl1);
12753 /* Reset this in case the call to pushdecl changed it. */
12754 current_function_decl = decl1;
12756 gcc_assert (DECL_INITIAL (decl1));
12758 /* This function may already have been parsed, in which case just
12759 return; our caller will skip over the body without parsing. */
12760 if (DECL_INITIAL (decl1) != error_mark_node)
12763 /* Initialize RTL machinery. We cannot do this until
12764 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12765 even when processing a template; this is how we get
12766 CFUN set up, and our per-function variables initialized.
12767 FIXME factor out the non-RTL stuff. */
12768 bl = current_binding_level;
12769 allocate_struct_function (decl1, processing_template_decl);
12771 /* Initialize the language data structures. Whenever we start
12772 a new function, we destroy temporaries in the usual way. */
12773 cfun->language = ggc_alloc_cleared_language_function ();
12774 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12775 current_binding_level = bl;
12777 /* Start the statement-tree, start the tree now. */
12778 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12780 /* If we are (erroneously) defining a function that we have already
12781 defined before, wipe out what we knew before. */
12782 if (!DECL_PENDING_INLINE_P (decl1))
12783 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12785 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12787 /* We know that this was set up by `grokclassfn'. We do not
12788 wait until `store_parm_decls', since evil parse errors may
12789 never get us to that point. Here we keep the consistency
12790 between `current_class_type' and `current_class_ptr'. */
12791 tree t = DECL_ARGUMENTS (decl1);
12793 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12794 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12796 cp_function_chain->x_current_class_ref
12797 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12798 /* Set this second to avoid shortcut in cp_build_indirect_ref. */
12799 cp_function_chain->x_current_class_ptr = t;
12801 /* Constructors and destructors need to know whether they're "in
12802 charge" of initializing virtual base classes. */
12803 t = DECL_CHAIN (t);
12804 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12806 current_in_charge_parm = t;
12807 t = DECL_CHAIN (t);
12809 if (DECL_HAS_VTT_PARM_P (decl1))
12811 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12812 current_vtt_parm = t;
12816 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12817 /* Implicitly-defined methods (like the
12818 destructor for a class in which no destructor
12819 is explicitly declared) must not be defined
12820 until their definition is needed. So, we
12821 ignore interface specifications for
12822 compiler-generated functions. */
12823 && !DECL_ARTIFICIAL (decl1));
12825 if (processing_template_decl)
12826 /* Don't mess with interface flags. */;
12827 else if (DECL_INTERFACE_KNOWN (decl1))
12829 tree ctx = decl_function_context (decl1);
12831 if (DECL_NOT_REALLY_EXTERN (decl1))
12832 DECL_EXTERNAL (decl1) = 0;
12834 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12835 && TREE_PUBLIC (ctx))
12836 /* This is a function in a local class in an extern inline
12838 comdat_linkage (decl1);
12840 /* If this function belongs to an interface, it is public.
12841 If it belongs to someone else's interface, it is also external.
12842 This only affects inlines and template instantiations. */
12843 else if (!finfo->interface_unknown && honor_interface)
12845 if (DECL_DECLARED_INLINE_P (decl1)
12846 || DECL_TEMPLATE_INSTANTIATION (decl1))
12848 DECL_EXTERNAL (decl1)
12849 = (finfo->interface_only
12850 || (DECL_DECLARED_INLINE_P (decl1)
12851 && ! flag_implement_inlines
12852 && !DECL_VINDEX (decl1)));
12854 /* For WIN32 we also want to put these in linkonce sections. */
12855 maybe_make_one_only (decl1);
12858 DECL_EXTERNAL (decl1) = 0;
12859 DECL_INTERFACE_KNOWN (decl1) = 1;
12860 /* If this function is in an interface implemented in this file,
12861 make sure that the back end knows to emit this function
12863 if (!DECL_EXTERNAL (decl1))
12864 mark_needed (decl1);
12866 else if (finfo->interface_unknown && finfo->interface_only
12867 && honor_interface)
12869 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12870 interface, we will have both finfo->interface_unknown and
12871 finfo->interface_only set. In that case, we don't want to
12872 use the normal heuristics because someone will supply a
12873 #pragma implementation elsewhere, and deducing it here would
12874 produce a conflict. */
12875 comdat_linkage (decl1);
12876 DECL_EXTERNAL (decl1) = 0;
12877 DECL_INTERFACE_KNOWN (decl1) = 1;
12878 DECL_DEFER_OUTPUT (decl1) = 1;
12882 /* This is a definition, not a reference.
12883 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12884 if (!GNU_INLINE_P (decl1))
12885 DECL_EXTERNAL (decl1) = 0;
12887 if ((DECL_DECLARED_INLINE_P (decl1)
12888 || DECL_TEMPLATE_INSTANTIATION (decl1))
12889 && ! DECL_INTERFACE_KNOWN (decl1))
12890 DECL_DEFER_OUTPUT (decl1) = 1;
12892 DECL_INTERFACE_KNOWN (decl1) = 1;
12895 /* Determine the ELF visibility attribute for the function. We must not
12896 do this before calling "pushdecl", as we must allow "duplicate_decls"
12897 to merge any attributes appropriately. We also need to wait until
12899 if (!DECL_CLONED_FUNCTION_P (decl1))
12900 determine_visibility (decl1);
12902 begin_scope (sk_function_parms, decl1);
12906 if (DECL_DESTRUCTOR_P (decl1)
12907 || (DECL_CONSTRUCTOR_P (decl1)
12908 && targetm.cxx.cdtor_returns_this ()))
12910 cdtor_label = build_decl (input_location,
12911 LABEL_DECL, NULL_TREE, NULL_TREE);
12912 DECL_CONTEXT (cdtor_label) = current_function_decl;
12915 start_fname_decls ();
12917 store_parm_decls (current_function_parms);
12921 /* Like start_preparsed_function, except that instead of a
12922 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12924 Returns 1 on success. If the DECLARATOR is not suitable for a function
12925 (it defines a datum instead), we return 0, which tells
12926 yyparse to report a parse error. */
12929 start_function (cp_decl_specifier_seq *declspecs,
12930 const cp_declarator *declarator,
12935 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12936 if (decl1 == error_mark_node)
12938 /* If the declarator is not suitable for a function definition,
12939 cause a syntax error. */
12940 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12942 error ("invalid function declaration");
12946 if (DECL_MAIN_P (decl1))
12947 /* main must return int. grokfndecl should have corrected it
12948 (and issued a diagnostic) if the user got it wrong. */
12949 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12950 integer_type_node));
12952 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12957 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12961 use_eh_spec_block (tree fn)
12963 return (flag_exceptions && flag_enforce_eh_specs
12964 && !processing_template_decl
12965 && !type_throw_all_p (TREE_TYPE (fn))
12966 /* We insert the EH_SPEC_BLOCK only in the original
12967 function; then, it is copied automatically to the
12969 && !DECL_CLONED_FUNCTION_P (fn)
12970 /* Implicitly-generated constructors and destructors have
12971 exception specifications. However, those specifications
12972 are the union of the possible exceptions specified by the
12973 constructors/destructors for bases and members, so no
12974 unallowed exception will ever reach this function. By
12975 not creating the EH_SPEC_BLOCK we save a little memory,
12976 and we avoid spurious warnings about unreachable
12978 && !DECL_DEFAULTED_FN (fn));
12981 /* Store the parameter declarations into the current function declaration.
12982 This is called after parsing the parameter declarations, before
12983 digesting the body of the function.
12985 Also install to binding contour return value identifier, if any. */
12988 store_parm_decls (tree current_function_parms)
12990 tree fndecl = current_function_decl;
12993 /* This is a chain of any other decls that came in among the parm
12994 declarations. If a parm is declared with enum {foo, bar} x;
12995 then CONST_DECLs for foo and bar are put here. */
12996 tree nonparms = NULL_TREE;
12998 if (current_function_parms)
13000 /* This case is when the function was defined with an ANSI prototype.
13001 The parms already have decls, so we need not do anything here
13002 except record them as in effect
13003 and complain if any redundant old-style parm decls were written. */
13005 tree specparms = current_function_parms;
13008 /* Must clear this because it might contain TYPE_DECLs declared
13010 current_binding_level->names = NULL;
13012 /* If we're doing semantic analysis, then we'll call pushdecl
13013 for each of these. We must do them in reverse order so that
13014 they end in the correct forward order. */
13015 specparms = nreverse (specparms);
13017 for (parm = specparms; parm; parm = next)
13019 next = DECL_CHAIN (parm);
13020 if (TREE_CODE (parm) == PARM_DECL)
13022 if (DECL_NAME (parm) == NULL_TREE
13023 || TREE_CODE (parm) != VOID_TYPE)
13026 error ("parameter %qD declared void", parm);
13030 /* If we find an enum constant or a type tag,
13031 put it aside for the moment. */
13032 TREE_CHAIN (parm) = NULL_TREE;
13033 nonparms = chainon (nonparms, parm);
13037 /* Get the decls in their original chain order and record in the
13038 function. This is all and only the PARM_DECLs that were
13039 pushed into scope by the loop above. */
13040 DECL_ARGUMENTS (fndecl) = getdecls ();
13043 DECL_ARGUMENTS (fndecl) = NULL_TREE;
13045 /* Now store the final chain of decls for the arguments
13046 as the decl-chain of the current lexical scope.
13047 Put the enumerators in as well, at the front so that
13048 DECL_ARGUMENTS is not modified. */
13049 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
13051 if (use_eh_spec_block (current_function_decl))
13052 current_eh_spec_block = begin_eh_spec_block ();
13056 /* We have finished doing semantic analysis on DECL, but have not yet
13057 generated RTL for its body. Save away our current state, so that
13058 when we want to generate RTL later we know what to do. */
13061 save_function_data (tree decl)
13063 struct language_function *f;
13065 /* Save the language-specific per-function data so that we can
13066 get it back when we really expand this function. */
13067 gcc_assert (!DECL_PENDING_INLINE_P (decl));
13070 f = ggc_alloc_language_function ();
13071 memcpy (f, cp_function_chain, sizeof (struct language_function));
13072 DECL_SAVED_FUNCTION_DATA (decl) = f;
13074 /* Clear out the bits we don't need. */
13075 f->base.x_stmt_tree.x_cur_stmt_list = NULL;
13076 f->bindings = NULL;
13077 f->x_local_names = NULL;
13078 f->base.local_typedefs = NULL;
13082 /* Set the return value of the constructor (if present). */
13085 finish_constructor_body (void)
13090 if (targetm.cxx.cdtor_returns_this ()
13091 && (! TYPE_FOR_JAVA (current_class_type)))
13093 /* Any return from a constructor will end up here. */
13094 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13096 val = DECL_ARGUMENTS (current_function_decl);
13097 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13098 DECL_RESULT (current_function_decl), val);
13099 /* Return the address of the object. */
13100 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13101 add_stmt (exprstmt);
13105 /* Do all the processing for the beginning of a destructor; set up the
13106 vtable pointers and cleanups for bases and members. */
13109 begin_destructor_body (void)
13111 tree compound_stmt;
13113 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
13114 issued an error message. We still want to try to process the
13115 body of the function, but initialize_vtbl_ptrs will crash if
13116 TYPE_BINFO is NULL. */
13117 if (COMPLETE_TYPE_P (current_class_type))
13119 compound_stmt = begin_compound_stmt (0);
13120 /* Make all virtual function table pointers in non-virtual base
13121 classes point to CURRENT_CLASS_TYPE's virtual function
13123 initialize_vtbl_ptrs (current_class_ptr);
13124 finish_compound_stmt (compound_stmt);
13126 /* And insert cleanups for our bases and members so that they
13127 will be properly destroyed if we throw. */
13128 push_base_cleanups ();
13132 /* At the end of every destructor we generate code to delete the object if
13133 necessary. Do that now. */
13136 finish_destructor_body (void)
13140 /* Any return from a destructor will end up here; that way all base
13141 and member cleanups will be run when the function returns. */
13142 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
13144 /* In a virtual destructor, we must call delete. */
13145 if (DECL_VIRTUAL_P (current_function_decl))
13148 tree virtual_size = cxx_sizeof (current_class_type);
13152 At the point of definition of a virtual destructor (including
13153 an implicit definition), non-placement operator delete shall
13154 be looked up in the scope of the destructor's class and if
13155 found shall be accessible and unambiguous. */
13156 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
13158 /*global_p=*/false,
13159 /*placement=*/NULL_TREE,
13160 /*alloc_fn=*/NULL_TREE);
13162 if_stmt = begin_if_stmt ();
13163 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
13164 current_in_charge_parm,
13167 finish_expr_stmt (exprstmt);
13168 finish_then_clause (if_stmt);
13169 finish_if_stmt (if_stmt);
13172 if (targetm.cxx.cdtor_returns_this ())
13176 val = DECL_ARGUMENTS (current_function_decl);
13177 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
13178 DECL_RESULT (current_function_decl), val);
13179 /* Return the address of the object. */
13180 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
13181 add_stmt (exprstmt);
13185 /* Do the necessary processing for the beginning of a function body, which
13186 in this case includes member-initializers, but not the catch clauses of
13187 a function-try-block. Currently, this means opening a binding level
13188 for the member-initializers (in a ctor), member cleanups (in a dtor),
13189 and capture proxies (in a lambda operator()). */
13192 begin_function_body (void)
13196 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13199 if (processing_template_decl)
13200 /* Do nothing now. */;
13202 /* Always keep the BLOCK node associated with the outermost pair of
13203 curly braces of a function. These are needed for correct
13204 operation of dwarfout.c. */
13205 keep_next_level (true);
13207 stmt = begin_compound_stmt (BCS_FN_BODY);
13209 if (processing_template_decl)
13210 /* Do nothing now. */;
13211 else if (DECL_DESTRUCTOR_P (current_function_decl))
13212 begin_destructor_body ();
13217 /* Do the processing for the end of a function body. Currently, this means
13218 closing out the cleanups for fully-constructed bases and members, and in
13219 the case of the destructor, deleting the object if desired. Again, this
13220 is only meaningful for [cd]tors, since they are the only functions where
13221 there is a significant distinction between the main body and any
13222 function catch clauses. Handling, say, main() return semantics here
13223 would be wrong, as flowing off the end of a function catch clause for
13224 main() would also need to return 0. */
13227 finish_function_body (tree compstmt)
13229 if (compstmt == NULL_TREE)
13232 /* Close the block. */
13233 finish_compound_stmt (compstmt);
13235 if (processing_template_decl)
13236 /* Do nothing now. */;
13237 else if (DECL_CONSTRUCTOR_P (current_function_decl))
13238 finish_constructor_body ();
13239 else if (DECL_DESTRUCTOR_P (current_function_decl))
13240 finish_destructor_body ();
13243 /* Given a function, returns the BLOCK corresponding to the outermost level
13244 of curly braces, skipping the artificial block created for constructor
13248 outer_curly_brace_block (tree fndecl)
13250 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
13251 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
13252 /* Skip the artificial function body block. */
13253 block = BLOCK_SUBBLOCKS (block);
13257 /* If FNDECL is a class's key method, add the class to the list of
13258 keyed classes that should be emitted. */
13261 record_key_method_defined (tree fndecl)
13263 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
13264 && DECL_VIRTUAL_P (fndecl)
13265 && !processing_template_decl)
13267 tree fnclass = DECL_CONTEXT (fndecl);
13268 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
13269 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
13273 /* Subroutine of finish_function.
13274 Save the body of constexpr functions for possible
13275 future compile time evaluation. */
13278 maybe_save_function_definition (tree fun)
13280 if (!processing_template_decl
13281 && DECL_DECLARED_CONSTEXPR_P (fun)
13282 && !DECL_CLONED_FUNCTION_P (fun))
13283 register_constexpr_fundef (fun, DECL_SAVED_TREE (fun));
13286 /* Finish up a function declaration and compile that function
13287 all the way to assembler language output. The free the storage
13288 for the function definition.
13290 FLAGS is a bitwise or of the following values:
13292 We just finished processing the body of an in-class inline
13293 function definition. (This processing will have taken place
13294 after the class definition is complete.) */
13297 finish_function (int flags)
13299 tree fndecl = current_function_decl;
13300 tree fntype, ctype = NULL_TREE;
13301 int inclass_inline = (flags & 2) != 0;
13303 /* When we get some parse errors, we can end up without a
13304 current_function_decl, so cope. */
13305 if (fndecl == NULL_TREE)
13306 return error_mark_node;
13308 if (c_dialect_objc ())
13309 objc_finish_function ();
13311 gcc_assert (!defer_mark_used_calls);
13312 defer_mark_used_calls = true;
13314 record_key_method_defined (fndecl);
13316 fntype = TREE_TYPE (fndecl);
13318 /* TREE_READONLY (fndecl) = 1;
13319 This caused &foo to be of type ptr-to-const-function
13320 which then got a warning when stored in a ptr-to-function variable. */
13322 gcc_assert (building_stmt_list_p ());
13323 /* The current function is being defined, so its DECL_INITIAL should
13324 be set, and unless there's a multiple definition, it should be
13325 error_mark_node. */
13326 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
13328 /* For a cloned function, we've already got all the code we need;
13329 there's no need to add any extra bits. */
13330 if (!DECL_CLONED_FUNCTION_P (fndecl))
13332 if (DECL_MAIN_P (current_function_decl))
13334 /* Make it so that `main' always returns 0 by default (or
13337 finish_return_stmt (integer_one_node);
13339 finish_return_stmt (integer_zero_node);
13343 if (use_eh_spec_block (current_function_decl))
13344 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
13345 (TREE_TYPE (current_function_decl)),
13346 current_eh_spec_block);
13349 /* If we're saving up tree structure, tie off the function now. */
13350 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
13352 finish_fname_decls ();
13354 /* If this function can't throw any exceptions, remember that. */
13355 if (!processing_template_decl
13356 && !cp_function_chain->can_throw
13357 && !flag_non_call_exceptions
13358 && !decl_replaceable_p (fndecl))
13359 TREE_NOTHROW (fndecl) = 1;
13361 /* This must come after expand_function_end because cleanups might
13362 have declarations (from inline functions) that need to go into
13363 this function's blocks. */
13365 /* If the current binding level isn't the outermost binding level
13366 for this function, either there is a bug, or we have experienced
13367 syntax errors and the statement tree is malformed. */
13368 if (current_binding_level->kind != sk_function_parms)
13370 /* Make sure we have already experienced errors. */
13371 gcc_assert (errorcount);
13373 /* Throw away the broken statement tree and extra binding
13375 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
13377 while (current_binding_level->kind != sk_function_parms)
13379 if (current_binding_level->kind == sk_class)
13380 pop_nested_class ();
13382 poplevel (0, 0, 0);
13385 poplevel (1, 0, 1);
13387 /* Statements should always be full-expressions at the outermost set
13388 of curly braces for a function. */
13389 gcc_assert (stmts_are_full_exprs_p ());
13391 /* Save constexpr function body before it gets munged by
13392 the NRV transformation. */
13393 maybe_save_function_definition (fndecl);
13395 /* Set up the named return value optimization, if we can. Candidate
13396 variables are selected in check_return_expr. */
13397 if (current_function_return_value)
13399 tree r = current_function_return_value;
13402 if (r != error_mark_node
13403 /* This is only worth doing for fns that return in memory--and
13404 simpler, since we don't have to worry about promoted modes. */
13405 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
13406 /* Only allow this for variables declared in the outer scope of
13407 the function so we know that their lifetime always ends with a
13408 return; see g++.dg/opt/nrv6.C. We could be more flexible if
13409 we were to do this optimization in tree-ssa. */
13410 && (outer = outer_curly_brace_block (fndecl))
13411 && chain_member (r, BLOCK_VARS (outer)))
13412 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
13414 current_function_return_value = NULL_TREE;
13417 /* Remember that we were in class scope. */
13418 if (current_class_name)
13419 ctype = current_class_type;
13421 /* Must mark the RESULT_DECL as being in this function. */
13422 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
13424 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
13425 to the FUNCTION_DECL node itself. */
13426 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
13428 /* Save away current state, if appropriate. */
13429 if (!processing_template_decl)
13430 save_function_data (fndecl);
13432 /* Complain if there's just no return statement. */
13433 if (warn_return_type
13434 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
13435 && !dependent_type_p (TREE_TYPE (fntype))
13436 && !current_function_returns_value && !current_function_returns_null
13437 /* Don't complain if we abort or throw. */
13438 && !current_function_returns_abnormally
13439 /* Don't complain if we are declared noreturn. */
13440 && !TREE_THIS_VOLATILE (fndecl)
13441 && !DECL_NAME (DECL_RESULT (fndecl))
13442 && !TREE_NO_WARNING (fndecl)
13443 /* Structor return values (if any) are set by the compiler. */
13444 && !DECL_CONSTRUCTOR_P (fndecl)
13445 && !DECL_DESTRUCTOR_P (fndecl))
13447 warning (OPT_Wreturn_type,
13448 "no return statement in function returning non-void");
13449 TREE_NO_WARNING (fndecl) = 1;
13452 /* Store the end of the function, so that we get good line number
13453 info for the epilogue. */
13454 cfun->function_end_locus = input_location;
13456 /* Complain about parameters that are only set, but never otherwise used. */
13457 if (warn_unused_but_set_parameter
13458 && !processing_template_decl
13459 && errorcount == unused_but_set_errorcount
13460 && !DECL_CLONED_FUNCTION_P (fndecl))
13464 for (decl = DECL_ARGUMENTS (fndecl);
13466 decl = DECL_CHAIN (decl))
13467 if (TREE_USED (decl)
13468 && TREE_CODE (decl) == PARM_DECL
13469 && !DECL_READ_P (decl)
13470 && DECL_NAME (decl)
13471 && !DECL_ARTIFICIAL (decl)
13472 && !TREE_NO_WARNING (decl)
13473 && !DECL_IN_SYSTEM_HEADER (decl)
13474 && TREE_TYPE (decl) != error_mark_node
13475 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
13476 && (!CLASS_TYPE_P (TREE_TYPE (decl))
13477 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
13478 warning (OPT_Wunused_but_set_parameter,
13479 "parameter %q+D set but not used", decl);
13480 unused_but_set_errorcount = errorcount;
13483 /* Complain about locally defined typedefs that are not used in this
13485 maybe_warn_unused_local_typedefs ();
13487 /* Genericize before inlining. */
13488 if (!processing_template_decl)
13490 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
13491 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
13492 cp_genericize (fndecl);
13493 /* Clear out the bits we don't need. */
13494 f->x_current_class_ptr = NULL;
13495 f->x_current_class_ref = NULL;
13496 f->x_eh_spec_block = NULL;
13497 f->x_in_charge_parm = NULL;
13498 f->x_vtt_parm = NULL;
13499 f->x_return_value = NULL;
13500 f->bindings = NULL;
13501 f->extern_decl_map = NULL;
13503 /* Clear out the bits we don't need. */
13504 local_names = NULL;
13506 /* We're leaving the context of this function, so zap cfun. It's still in
13507 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
13509 current_function_decl = NULL;
13511 /* If this is an in-class inline definition, we may have to pop the
13512 bindings for the template parameters that we added in
13513 maybe_begin_member_template_processing when start_function was
13515 if (inclass_inline)
13516 maybe_end_member_template_processing ();
13518 /* Leave the scope of the class. */
13520 pop_nested_class ();
13525 current_function_decl = NULL_TREE;
13527 defer_mark_used_calls = false;
13528 if (deferred_mark_used_calls)
13533 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
13535 VEC_free (tree, gc, deferred_mark_used_calls);
13541 /* Create the FUNCTION_DECL for a function definition.
13542 DECLSPECS and DECLARATOR are the parts of the declaration;
13543 they describe the return type and the name of the function,
13544 but twisted together in a fashion that parallels the syntax of C.
13546 This function creates a binding context for the function body
13547 as well as setting up the FUNCTION_DECL in current_function_decl.
13549 Returns a FUNCTION_DECL on success.
13551 If the DECLARATOR is not suitable for a function (it defines a datum
13552 instead), we return 0, which tells yyparse to report a parse error.
13554 May return void_type_node indicating that this method is actually
13555 a friend. See grokfield for more details.
13557 Came here with a `.pushlevel' .
13559 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
13560 CHANGES TO CODE IN `grokfield'. */
13563 grokmethod (cp_decl_specifier_seq *declspecs,
13564 const cp_declarator *declarator, tree attrlist)
13566 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
13569 if (fndecl == error_mark_node)
13570 return error_mark_node;
13572 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
13574 error ("invalid member function declaration");
13575 return error_mark_node;
13579 cplus_decl_attributes (&fndecl, attrlist, 0);
13581 /* Pass friends other than inline friend functions back. */
13582 if (fndecl == void_type_node)
13585 if (DECL_IN_AGGR_P (fndecl))
13587 if (DECL_CLASS_SCOPE_P (fndecl))
13588 error ("%qD is already defined in class %qT", fndecl,
13589 DECL_CONTEXT (fndecl));
13590 return error_mark_node;
13593 check_template_shadow (fndecl);
13595 DECL_DECLARED_INLINE_P (fndecl) = 1;
13596 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
13598 /* We process method specializations in finish_struct_1. */
13599 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
13601 fndecl = push_template_decl (fndecl);
13602 if (fndecl == error_mark_node)
13606 if (! DECL_FRIEND_P (fndecl))
13608 if (DECL_CHAIN (fndecl))
13610 fndecl = copy_node (fndecl);
13611 TREE_CHAIN (fndecl) = NULL_TREE;
13615 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
13617 DECL_IN_AGGR_P (fndecl) = 1;
13622 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
13623 we can lay it out later, when and if its type becomes complete. */
13626 maybe_register_incomplete_var (tree var)
13628 gcc_assert (TREE_CODE (var) == VAR_DECL);
13630 /* Keep track of variables with incomplete types. */
13631 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
13632 && DECL_EXTERNAL (var))
13634 tree inner_type = TREE_TYPE (var);
13636 while (TREE_CODE (inner_type) == ARRAY_TYPE)
13637 inner_type = TREE_TYPE (inner_type);
13638 inner_type = TYPE_MAIN_VARIANT (inner_type);
13640 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13641 /* RTTI TD entries are created while defining the type_info. */
13642 || (TYPE_LANG_SPECIFIC (inner_type)
13643 && TYPE_BEING_DEFINED (inner_type)))
13646 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13648 iv->incomplete_type = inner_type;
13653 /* Called when a class type (given by TYPE) is defined. If there are
13654 any existing VAR_DECLs whose type has been completed by this
13655 declaration, update them now. */
13658 complete_vars (tree type)
13661 incomplete_var *iv;
13663 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13665 if (same_type_p (type, iv->incomplete_type))
13667 tree var = iv->decl;
13668 tree type = TREE_TYPE (var);
13669 /* Complete the type of the variable. The VAR_DECL itself
13670 will be laid out in expand_expr. */
13671 complete_type (type);
13672 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13673 /* Remove this entry from the list. */
13674 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13680 /* Check for pending declarations which may have abstract type. */
13681 complete_type_check_abstract (type);
13684 /* If DECL is of a type which needs a cleanup, build and return an
13685 expression to perform that cleanup here. Return NULL_TREE if no
13686 cleanup need be done. */
13689 cxx_maybe_build_cleanup (tree decl, tsubst_flags_t complain)
13695 /* Assume no cleanup is required. */
13696 cleanup = NULL_TREE;
13698 if (error_operand_p (decl))
13701 /* Handle "__attribute__((cleanup))". We run the cleanup function
13702 before the destructor since the destructor is what actually
13703 terminates the lifetime of the object. */
13704 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13711 /* Get the name specified by the user for the cleanup function. */
13712 id = TREE_VALUE (TREE_VALUE (attr));
13713 /* Look up the name to find the cleanup function to call. It is
13714 important to use lookup_name here because that is what is
13715 used in c-common.c:handle_cleanup_attribute when performing
13716 initial checks on the attribute. Note that those checks
13717 include ensuring that the function found is not an overloaded
13718 function, or an object with an overloaded call operator,
13719 etc.; we can rely on the fact that the function found is an
13720 ordinary FUNCTION_DECL. */
13721 fn = lookup_name (id);
13722 arg = build_address (decl);
13724 cleanup = cp_build_function_call_nary (fn, complain, arg, NULL_TREE);
13725 if (cleanup == error_mark_node)
13726 return error_mark_node;
13728 /* Handle ordinary C++ destructors. */
13729 type = TREE_TYPE (decl);
13730 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13732 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13733 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13734 && CLASSTYPE_VBASECLASSES (type));
13738 if (TREE_CODE (type) == ARRAY_TYPE)
13741 addr = build_address (decl);
13743 /* Optimize for space over speed here. */
13744 if (!has_vbases || flag_expensive_optimizations)
13745 flags |= LOOKUP_NONVIRTUAL;
13747 call = build_delete (TREE_TYPE (addr), addr,
13748 sfk_complete_destructor, flags, 0, complain);
13749 if (call == error_mark_node)
13750 cleanup = error_mark_node;
13752 cleanup = cp_build_compound_expr (cleanup, call, complain);
13760 /* When a stmt has been parsed, this function is called. */
13767 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13768 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13769 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13772 static_fn_type (tree memfntype)
13777 if (TYPE_PTRMEMFUNC_P (memfntype))
13778 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13779 if (POINTER_TYPE_P (memfntype)
13780 || TREE_CODE (memfntype) == FUNCTION_DECL)
13781 memfntype = TREE_TYPE (memfntype);
13782 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13784 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13785 args = TYPE_ARG_TYPES (memfntype);
13786 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13787 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13788 fntype = (cp_build_type_attribute_variant
13789 (fntype, TYPE_ATTRIBUTES (memfntype)));
13790 fntype = (build_exception_variant
13791 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13795 /* DECL was originally constructed as a non-static member function,
13796 but turned out to be static. Update it accordingly. */
13799 revert_static_member_fn (tree decl)
13801 tree stype = static_fn_type (decl);
13802 cp_cv_quals quals = type_memfn_quals (stype);
13804 if (quals != TYPE_UNQUALIFIED)
13805 stype = apply_memfn_quals (stype, TYPE_UNQUALIFIED);
13807 TREE_TYPE (decl) = stype;
13809 if (DECL_ARGUMENTS (decl))
13810 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13811 DECL_STATIC_FUNCTION_P (decl) = 1;
13814 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13815 one of the language-independent trees. */
13817 enum cp_tree_node_structure_enum
13818 cp_tree_node_structure (union lang_tree_node * t)
13820 switch (TREE_CODE (&t->generic))
13822 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13823 case DEFERRED_NOEXCEPT: return TS_CP_DEFERRED_NOEXCEPT;
13824 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13825 case OVERLOAD: return TS_CP_OVERLOAD;
13826 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13827 case PTRMEM_CST: return TS_CP_PTRMEM;
13828 case BASELINK: return TS_CP_BASELINK;
13829 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13830 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13831 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13832 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13833 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13834 case USERDEF_LITERAL: return TS_CP_USERDEF_LITERAL;
13835 default: return TS_CP_GENERIC;
13839 /* Build the void_list_node (void_type_node having been created). */
13841 build_void_list_node (void)
13843 tree t = build_tree_list (NULL_TREE, void_type_node);
13848 cp_missing_noreturn_ok_p (tree decl)
13850 /* A missing noreturn is ok for the `main' function. */
13851 return DECL_MAIN_P (decl);
13854 /* Return the COMDAT group into which DECL should be placed. */
13857 cxx_comdat_group (tree decl)
13861 /* Virtual tables, construction virtual tables, and virtual table
13862 tables all go in a single COMDAT group, named after the primary
13864 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13865 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13866 /* For all other DECLs, the COMDAT group is the mangled name of the
13867 declaration itself. */
13870 while (DECL_THUNK_P (decl))
13872 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13873 into the same section as the target function. In that case
13874 we must return target's name. */
13875 tree target = THUNK_TARGET (decl);
13876 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13877 && DECL_SECTION_NAME (target) != NULL
13878 && DECL_ONE_ONLY (target))
13883 name = DECL_ASSEMBLER_NAME (decl);
13889 #include "gt-cp-decl.h"