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
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
56 #include "tree-iterator.h"
57 #include "diagnostic.h"
58 #include "tree-dump.h"
63 #include "langhooks-def.h"
64 #include "pointer-set.h"
67 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
69 { NORMAL, /* Ordinary declaration */
70 FUNCDEF, /* Function definition */
71 PARM, /* Declaration of parm before function body */
72 FIELD, /* Declaration inside struct or union */
73 TYPENAME}; /* Typename (inside cast or sizeof) */
75 /* States indicating how grokdeclarator() should handle declspecs marked
76 with __attribute__((deprecated)). An object declared as
77 __attribute__((deprecated)) suppresses warnings of uses of other
80 enum deprecated_states {
86 /* Nonzero if we have seen an invalid cross reference
87 to a struct, union, or enum, but not yet printed the message. */
88 tree pending_invalid_xref;
90 /* File and line to appear in the eventual error message. */
91 location_t pending_invalid_xref_location;
93 /* True means we've initialized exception handling. */
94 bool c_eh_initialized_p;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info *current_function_arg_info;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* State saving variables. */
128 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
129 included in this invocation. Note that the current translation
130 unit is not included in this list. */
132 static GTY(()) tree all_translation_units;
134 /* A list of decls to be made automatically visible in each file scope. */
135 static GTY(()) tree visible_builtins;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a call to a noreturn function is seen. */
150 int current_function_returns_abnormally;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type;
157 /* Nonzero when the current toplevel function contains a declaration
158 of a nested function which is never defined. */
160 static bool undef_nested_function;
162 /* True means global_bindings_p should return false even if the scope stack
163 says we are in file scope. */
164 bool c_override_global_bindings_to_false;
167 /* Each c_binding structure describes one binding of an identifier to
168 a decl. All the decls in a scope - irrespective of namespace - are
169 chained together by the ->prev field, which (as the name implies)
170 runs in reverse order. All the decls in a given namespace bound to
171 a given identifier are chained by the ->shadowed field, which runs
172 from inner to outer scopes.
174 The ->decl field usually points to a DECL node, but there are two
175 exceptions. In the namespace of type tags, the bound entity is a
176 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
177 identifier is encountered, it is bound to error_mark_node to
178 suppress further errors about that identifier in the current
181 The ->type field stores the type of the declaration in this scope;
182 if NULL, the type is the type of the ->decl field. This is only of
183 relevance for objects with external or internal linkage which may
184 be redeclared in inner scopes, forming composite types that only
185 persist for the duration of those scopes. In the external scope,
186 this stores the composite of all the types declared for this
187 object, visible or not. The ->inner_comp field (used only at file
188 scope) stores whether an incomplete array type at file scope was
189 completed at an inner scope to an array size other than 1.
191 The depth field is copied from the scope structure that holds this
192 decl. It is used to preserve the proper ordering of the ->shadowed
193 field (see bind()) and also for a handful of special-case checks.
194 Finally, the invisible bit is true for a decl which should be
195 ignored for purposes of normal name lookup, and the nested bit is
196 true for a decl that's been bound a second time in an inner scope;
197 in all such cases, the binding in the outer scope will have its
198 invisible bit true. */
200 struct c_binding GTY((chain_next ("%h.prev")))
202 tree decl; /* the decl bound */
203 tree type; /* the type in this scope */
204 tree id; /* the identifier it's bound to */
205 struct c_binding *prev; /* the previous decl in this scope */
206 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
207 unsigned int depth : 28; /* depth of this scope */
208 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct lang_identifier GTY(())
239 struct c_common_identifier common_id;
240 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
241 struct c_binding *tag_binding; /* struct/union/enum tags */
242 struct c_binding *label_binding; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
249 /* The resulting tree type. */
252 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
253 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))")))
255 union tree_node GTY ((tag ("0"),
256 desc ("tree_node_structure (&%h)")))
258 struct lang_identifier GTY ((tag ("1"))) identifier;
261 /* Each c_scope structure describes the complete contents of one
262 scope. Four scopes are distinguished specially: the innermost or
263 current scope, the innermost function scope, the file scope (always
264 the second to outermost) and the outermost or external scope.
266 Most declarations are recorded in the current scope.
268 All normal label declarations are recorded in the innermost
269 function scope, as are bindings of undeclared identifiers to
270 error_mark_node. (GCC permits nested functions as an extension,
271 hence the 'innermost' qualifier.) Explicitly declared labels
272 (using the __label__ extension) appear in the current scope.
274 Being in the file scope (current_scope == file_scope) causes
275 special behavior in several places below. Also, under some
276 conditions the Objective-C front end records declarations in the
277 file scope even though that isn't the current scope.
279 All declarations with external linkage are recorded in the external
280 scope, even if they aren't visible there; this models the fact that
281 such declarations are visible to the entire program, and (with a
282 bit of cleverness, see pushdecl) allows diagnosis of some violations
283 of C99 6.2.2p7 and 6.2.7p2:
285 If, within the same translation unit, the same identifier appears
286 with both internal and external linkage, the behavior is
289 All declarations that refer to the same object or function shall
290 have compatible type; otherwise, the behavior is undefined.
292 Initially only the built-in declarations, which describe compiler
293 intrinsic functions plus a subset of the standard library, are in
296 The order of the blocks list matters, and it is frequently appended
297 to. To avoid having to walk all the way to the end of the list on
298 each insertion, or reverse the list later, we maintain a pointer to
299 the last list entry. (FIXME: It should be feasible to use a reversed
302 The bindings list is strictly in reverse order of declarations;
303 pop_scope relies on this. */
306 struct c_scope GTY((chain_next ("%h.outer")))
308 /* The scope containing this one. */
309 struct c_scope *outer;
311 /* The next outermost function scope. */
312 struct c_scope *outer_function;
314 /* All bindings in this scope. */
315 struct c_binding *bindings;
317 /* For each scope (except the global one), a chain of BLOCK nodes
318 for all the scopes that were entered and exited one level down. */
322 /* The depth of this scope. Used to keep the ->shadowed chain of
323 bindings sorted innermost to outermost. */
324 unsigned int depth : 28;
326 /* True if we are currently filling this scope with parameter
328 BOOL_BITFIELD parm_flag : 1;
330 /* True if we saw [*] in this scope. Used to give an error messages
331 if these appears in a function definition. */
332 BOOL_BITFIELD had_vla_unspec : 1;
334 /* True if we already complained about forward parameter decls
335 in this scope. This prevents double warnings on
336 foo (int a; int b; ...) */
337 BOOL_BITFIELD warned_forward_parm_decls : 1;
339 /* True if this is the outermost block scope of a function body.
340 This scope contains the parameters, the local variables declared
341 in the outermost block, and all the labels (except those in
342 nested functions, or declared at block scope with __label__). */
343 BOOL_BITFIELD function_body : 1;
345 /* True means make a BLOCK for this scope no matter what. */
346 BOOL_BITFIELD keep : 1;
349 /* The scope currently in effect. */
351 static GTY(()) struct c_scope *current_scope;
353 /* The innermost function scope. Ordinary (not explicitly declared)
354 labels, bindings to error_mark_node, and the lazily-created
355 bindings of __func__ and its friends get this scope. */
357 static GTY(()) struct c_scope *current_function_scope;
359 /* The C file scope. This is reset for each input translation unit. */
361 static GTY(()) struct c_scope *file_scope;
363 /* The outermost scope. This is used for all declarations with
364 external linkage, and only these, hence the name. */
366 static GTY(()) struct c_scope *external_scope;
368 /* A chain of c_scope structures awaiting reuse. */
370 static GTY((deletable)) struct c_scope *scope_freelist;
372 /* A chain of c_binding structures awaiting reuse. */
374 static GTY((deletable)) struct c_binding *binding_freelist;
376 /* Append VAR to LIST in scope SCOPE. */
377 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
378 struct c_scope *s_ = (scope); \
380 if (s_->list##_last) \
381 BLOCK_CHAIN (s_->list##_last) = d_; \
384 s_->list##_last = d_; \
387 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
388 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
389 struct c_scope *t_ = (tscope); \
390 struct c_scope *f_ = (fscope); \
392 BLOCK_CHAIN (t_->to##_last) = f_->from; \
395 t_->to##_last = f_->from##_last; \
398 /* True means unconditionally make a BLOCK for the next scope pushed. */
400 static bool keep_next_level_flag;
402 /* True means the next call to push_scope will be the outermost scope
403 of a function body, so do not push a new scope, merely cease
404 expecting parameter decls. */
406 static bool next_is_function_body;
408 /* Forward declarations. */
409 static tree lookup_name_in_scope (tree, struct c_scope *);
410 static tree c_make_fname_decl (tree, int);
411 static tree grokdeclarator (const struct c_declarator *,
412 struct c_declspecs *,
413 enum decl_context, bool, tree *, tree *,
414 enum deprecated_states);
415 static tree grokparms (struct c_arg_info *, bool);
416 static void layout_array_type (tree);
418 /* T is a statement. Add it to the statement-tree. This is the
419 C/ObjC version--C++ has a slightly different version of this
425 enum tree_code code = TREE_CODE (t);
427 if (CAN_HAVE_LOCATION_P (t) && code != LABEL_EXPR)
429 if (!EXPR_HAS_LOCATION (t))
430 SET_EXPR_LOCATION (t, input_location);
433 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
434 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
436 /* Add T to the statement-tree. Non-side-effect statements need to be
437 recorded during statement expressions. */
438 append_to_statement_list_force (t, &cur_stmt_list);
445 c_print_identifier (FILE *file, tree node, int indent)
447 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
448 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
449 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
450 if (C_IS_RESERVED_WORD (node) && C_RID_CODE (node) != RID_CXX_COMPAT_WARN)
452 tree rid = ridpointers[C_RID_CODE (node)];
453 indent_to (file, indent + 4);
454 fprintf (file, "rid %p \"%s\"",
455 (void *) rid, IDENTIFIER_POINTER (rid));
459 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
460 which may be any of several kinds of DECL or TYPE or error_mark_node,
461 in the scope SCOPE. */
463 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
465 struct c_binding *b, **here;
467 if (binding_freelist)
469 b = binding_freelist;
470 binding_freelist = b->prev;
473 b = GGC_NEW (struct c_binding);
478 b->depth = scope->depth;
479 b->invisible = invisible;
485 b->prev = scope->bindings;
491 switch (TREE_CODE (decl))
493 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
496 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
502 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
508 /* Locate the appropriate place in the chain of shadowed decls
509 to insert this binding. Normally, scope == current_scope and
510 this does nothing. */
511 while (*here && (*here)->depth > scope->depth)
512 here = &(*here)->shadowed;
518 /* Clear the binding structure B, stick it on the binding_freelist,
519 and return the former value of b->prev. This is used by pop_scope
520 and get_parm_info to iterate destructively over all the bindings
521 from a given scope. */
522 static struct c_binding *
523 free_binding_and_advance (struct c_binding *b)
525 struct c_binding *prev = b->prev;
527 memset (b, 0, sizeof (struct c_binding));
528 b->prev = binding_freelist;
529 binding_freelist = b;
535 /* Hook called at end of compilation to assume 1 elt
536 for a file-scope tentative array defn that wasn't complete before. */
539 c_finish_incomplete_decl (tree decl)
541 if (TREE_CODE (decl) == VAR_DECL)
543 tree type = TREE_TYPE (decl);
544 if (type != error_mark_node
545 && TREE_CODE (type) == ARRAY_TYPE
546 && !DECL_EXTERNAL (decl)
547 && TYPE_DOMAIN (type) == 0)
549 warning (0, "array %q+D assumed to have one element", decl);
551 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
553 layout_decl (decl, 0);
558 /* The Objective-C front-end often needs to determine the current scope. */
561 objc_get_current_scope (void)
563 return current_scope;
566 /* The following function is used only by Objective-C. It needs to live here
567 because it accesses the innards of c_scope. */
570 objc_mark_locals_volatile (void *enclosing_blk)
572 struct c_scope *scope;
575 for (scope = current_scope;
576 scope && scope != enclosing_blk;
577 scope = scope->outer)
579 for (b = scope->bindings; b; b = b->prev)
580 objc_volatilize_decl (b->decl);
582 /* Do not climb up past the current function. */
583 if (scope->function_body)
588 /* Nonzero if we are currently in file scope. */
591 global_bindings_p (void)
593 return current_scope == file_scope && !c_override_global_bindings_to_false;
597 keep_next_level (void)
599 keep_next_level_flag = true;
602 /* Identify this scope as currently being filled with parameters. */
605 declare_parm_level (void)
607 current_scope->parm_flag = true;
613 if (next_is_function_body)
615 /* This is the transition from the parameters to the top level
616 of the function body. These are the same scope
617 (C99 6.2.1p4,6) so we do not push another scope structure.
618 next_is_function_body is set only by store_parm_decls, which
619 in turn is called when and only when we are about to
620 encounter the opening curly brace for the function body.
622 The outermost block of a function always gets a BLOCK node,
623 because the debugging output routines expect that each
624 function has at least one BLOCK. */
625 current_scope->parm_flag = false;
626 current_scope->function_body = true;
627 current_scope->keep = true;
628 current_scope->outer_function = current_function_scope;
629 current_function_scope = current_scope;
631 keep_next_level_flag = false;
632 next_is_function_body = false;
636 struct c_scope *scope;
639 scope = scope_freelist;
640 scope_freelist = scope->outer;
643 scope = GGC_CNEW (struct c_scope);
645 scope->keep = keep_next_level_flag;
646 scope->outer = current_scope;
647 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
649 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
651 if (current_scope && scope->depth == 0)
654 sorry ("GCC supports only %u nested scopes", scope->depth);
657 current_scope = scope;
658 keep_next_level_flag = false;
662 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
665 set_type_context (tree type, tree context)
667 for (type = TYPE_MAIN_VARIANT (type); type;
668 type = TYPE_NEXT_VARIANT (type))
669 TYPE_CONTEXT (type) = context;
672 /* Exit a scope. Restore the state of the identifier-decl mappings
673 that were in effect when this scope was entered. Return a BLOCK
674 node containing all the DECLs in this scope that are of interest
675 to debug info generation. */
680 struct c_scope *scope = current_scope;
681 tree block, context, p;
684 bool functionbody = scope->function_body;
685 bool keep = functionbody || scope->keep || scope->bindings;
687 c_end_vm_scope (scope->depth);
689 /* If appropriate, create a BLOCK to record the decls for the life
694 block = make_node (BLOCK);
695 BLOCK_SUBBLOCKS (block) = scope->blocks;
696 TREE_USED (block) = 1;
698 /* In each subblock, record that this is its superior. */
699 for (p = scope->blocks; p; p = BLOCK_CHAIN (p))
700 BLOCK_SUPERCONTEXT (p) = block;
702 BLOCK_VARS (block) = 0;
705 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
706 scope must be set so that they point to the appropriate
707 construct, i.e. either to the current FUNCTION_DECL node, or
708 else to the BLOCK node we just constructed.
710 Note that for tagged types whose scope is just the formal
711 parameter list for some function type specification, we can't
712 properly set their TYPE_CONTEXTs here, because we don't have a
713 pointer to the appropriate FUNCTION_TYPE node readily available
714 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
715 type nodes get set in `grokdeclarator' as soon as we have created
716 the FUNCTION_TYPE node which will represent the "scope" for these
717 "parameter list local" tagged types. */
718 if (scope->function_body)
719 context = current_function_decl;
720 else if (scope == file_scope)
722 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
723 TREE_CHAIN (file_decl) = all_translation_units;
724 all_translation_units = file_decl;
730 /* Clear all bindings in this scope. */
731 for (b = scope->bindings; b; b = free_binding_and_advance (b))
734 switch (TREE_CODE (p))
737 /* Warnings for unused labels, errors for undefined labels. */
738 if (TREE_USED (p) && !DECL_INITIAL (p))
740 error ("label %q+D used but not defined", p);
741 DECL_INITIAL (p) = error_mark_node;
744 warn_for_unused_label (p);
746 /* Labels go in BLOCK_VARS. */
747 TREE_CHAIN (p) = BLOCK_VARS (block);
748 BLOCK_VARS (block) = p;
749 gcc_assert (I_LABEL_BINDING (b->id) == b);
750 I_LABEL_BINDING (b->id) = b->shadowed;
756 set_type_context (p, context);
758 /* Types may not have tag-names, in which case the type
759 appears in the bindings list with b->id NULL. */
762 gcc_assert (I_TAG_BINDING (b->id) == b);
763 I_TAG_BINDING (b->id) = b->shadowed;
768 /* Propagate TREE_ADDRESSABLE from nested functions to their
769 containing functions. */
770 if (!TREE_ASM_WRITTEN (p)
771 && DECL_INITIAL (p) != 0
772 && TREE_ADDRESSABLE (p)
773 && DECL_ABSTRACT_ORIGIN (p) != 0
774 && DECL_ABSTRACT_ORIGIN (p) != p)
775 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
776 if (!DECL_EXTERNAL (p)
778 && scope != file_scope
779 && scope != external_scope)
781 error ("nested function %q+D declared but never defined", p);
782 undef_nested_function = true;
784 /* C99 6.7.4p6: "a function with external linkage... declared
785 with an inline function specifier ... shall also be defined in the
786 same translation unit." */
787 else if (DECL_DECLARED_INLINE_P (p)
790 && !flag_gnu89_inline)
791 pedwarn (0, "inline function %q+D declared but never defined", p);
796 /* Warnings for unused variables. */
798 && !TREE_NO_WARNING (p)
799 && !DECL_IN_SYSTEM_HEADER (p)
801 && !DECL_ARTIFICIAL (p)
802 && scope != file_scope
803 && scope != external_scope)
804 warning (OPT_Wunused_variable, "unused variable %q+D", p);
808 error ("type of array %q+D completed incompatibly with"
809 " implicit initialization", p);
816 /* All of these go in BLOCK_VARS, but only if this is the
817 binding in the home scope. */
820 TREE_CHAIN (p) = BLOCK_VARS (block);
821 BLOCK_VARS (block) = p;
823 /* If this is the file scope, and we are processing more
824 than one translation unit in this compilation, set
825 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
826 This makes same_translation_unit_p work, and causes
827 static declarations to be given disambiguating suffixes. */
828 if (scope == file_scope && num_in_fnames > 1)
830 DECL_CONTEXT (p) = context;
831 if (TREE_CODE (p) == TYPE_DECL)
832 set_type_context (TREE_TYPE (p), context);
836 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
837 already been put there by store_parm_decls. Unused-
838 parameter warnings are handled by function.c.
839 error_mark_node obviously does not go in BLOCK_VARS and
840 does not get unused-variable warnings. */
843 /* It is possible for a decl not to have a name. We get
844 here with b->id NULL in this case. */
847 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
848 I_SYMBOL_BINDING (b->id) = b->shadowed;
849 if (b->shadowed && b->shadowed->type)
850 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
860 /* Dispose of the block that we just made inside some higher level. */
861 if ((scope->function_body || scope == file_scope) && context)
863 DECL_INITIAL (context) = block;
864 BLOCK_SUPERCONTEXT (block) = context;
866 else if (scope->outer)
869 SCOPE_LIST_APPEND (scope->outer, blocks, block);
870 /* If we did not make a block for the scope just exited, any
871 blocks made for inner scopes must be carried forward so they
872 will later become subblocks of something else. */
873 else if (scope->blocks)
874 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
877 /* Pop the current scope, and free the structure for reuse. */
878 current_scope = scope->outer;
879 if (scope->function_body)
880 current_function_scope = scope->outer_function;
882 memset (scope, 0, sizeof (struct c_scope));
883 scope->outer = scope_freelist;
884 scope_freelist = scope;
890 push_file_scope (void)
898 file_scope = current_scope;
900 start_fname_decls ();
902 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
903 bind (DECL_NAME (decl), decl, file_scope,
904 /*invisible=*/false, /*nested=*/true);
908 pop_file_scope (void)
910 /* In case there were missing closebraces, get us back to the global
912 while (current_scope != file_scope)
915 /* __FUNCTION__ is defined at file scope (""). This
916 call may not be necessary as my tests indicate it
917 still works without it. */
918 finish_fname_decls ();
920 /* This is the point to write out a PCH if we're doing that.
921 In that case we do not want to do anything else. */
924 c_common_write_pch ();
928 /* Pop off the file scope and close this translation unit. */
932 maybe_apply_pending_pragma_weaks ();
933 cgraph_finalize_compilation_unit ();
937 /* Push a definition or a declaration of struct, union or enum tag "name".
938 "type" should be the type node.
939 We assume that the tag "name" is not already defined.
941 Note that the definition may really be just a forward reference.
942 In that case, the TYPE_SIZE will be zero. */
945 pushtag (tree name, tree type)
947 /* Record the identifier as the type's name if it has none. */
948 if (name && !TYPE_NAME (type))
949 TYPE_NAME (type) = name;
950 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
952 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
953 tagged type we just added to the current scope. This fake
954 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
955 to output a representation of a tagged type, and it also gives
956 us a convenient place to record the "scope start" address for the
959 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
961 /* An approximation for now, so we can tell this is a function-scope tag.
962 This will be updated in pop_scope. */
963 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
966 /* Subroutine of compare_decls. Allow harmless mismatches in return
967 and argument types provided that the type modes match. This function
968 return a unified type given a suitable match, and 0 otherwise. */
971 match_builtin_function_types (tree newtype, tree oldtype)
973 tree newrettype, oldrettype;
974 tree newargs, oldargs;
975 tree trytype, tryargs;
977 /* Accept the return type of the new declaration if same modes. */
978 oldrettype = TREE_TYPE (oldtype);
979 newrettype = TREE_TYPE (newtype);
981 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
984 oldargs = TYPE_ARG_TYPES (oldtype);
985 newargs = TYPE_ARG_TYPES (newtype);
988 while (oldargs || newargs)
992 || !TREE_VALUE (oldargs)
993 || !TREE_VALUE (newargs)
994 || TYPE_MODE (TREE_VALUE (oldargs))
995 != TYPE_MODE (TREE_VALUE (newargs)))
998 oldargs = TREE_CHAIN (oldargs);
999 newargs = TREE_CHAIN (newargs);
1002 trytype = build_function_type (newrettype, tryargs);
1003 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1006 /* Subroutine of diagnose_mismatched_decls. Check for function type
1007 mismatch involving an empty arglist vs a nonempty one and give clearer
1010 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1011 tree newtype, tree oldtype)
1015 if (TREE_CODE (olddecl) != FUNCTION_DECL
1016 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1017 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1019 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1022 t = TYPE_ARG_TYPES (oldtype);
1024 t = TYPE_ARG_TYPES (newtype);
1025 for (; t; t = TREE_CHAIN (t))
1027 tree type = TREE_VALUE (t);
1029 if (TREE_CHAIN (t) == 0
1030 && TYPE_MAIN_VARIANT (type) != void_type_node)
1032 inform ("a parameter list with an ellipsis can%'t match "
1033 "an empty parameter name list declaration");
1037 if (c_type_promotes_to (type) != type)
1039 inform ("an argument type that has a default promotion can%'t match "
1040 "an empty parameter name list declaration");
1046 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1047 old-style function definition, NEWDECL is a prototype declaration.
1048 Diagnose inconsistencies in the argument list. Returns TRUE if
1049 the prototype is compatible, FALSE if not. */
1051 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1053 tree newargs, oldargs;
1056 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1058 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1059 newargs = TYPE_ARG_TYPES (newtype);
1064 tree oldargtype = TREE_VALUE (oldargs);
1065 tree newargtype = TREE_VALUE (newargs);
1067 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1070 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1071 newargtype = TYPE_MAIN_VARIANT (newargtype);
1073 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1076 /* Reaching the end of just one list means the two decls don't
1077 agree on the number of arguments. */
1078 if (END_OF_ARGLIST (oldargtype))
1080 error ("prototype for %q+D declares more arguments "
1081 "than previous old-style definition", newdecl);
1084 else if (END_OF_ARGLIST (newargtype))
1086 error ("prototype for %q+D declares fewer arguments "
1087 "than previous old-style definition", newdecl);
1091 /* Type for passing arg must be consistent with that declared
1093 else if (!comptypes (oldargtype, newargtype))
1095 error ("prototype for %q+D declares argument %d"
1096 " with incompatible type",
1101 oldargs = TREE_CHAIN (oldargs);
1102 newargs = TREE_CHAIN (newargs);
1106 /* If we get here, no errors were found, but do issue a warning
1107 for this poor-style construct. */
1108 warning (0, "prototype for %q+D follows non-prototype definition",
1111 #undef END_OF_ARGLIST
1114 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1115 first in a pair of mismatched declarations, using the diagnostic
1118 locate_old_decl (tree decl)
1120 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1122 else if (DECL_INITIAL (decl))
1123 inform ("previous definition of %q+D was here", decl);
1124 else if (C_DECL_IMPLICIT (decl))
1125 inform ("previous implicit declaration of %q+D was here", decl);
1127 inform ("previous declaration of %q+D was here", decl);
1130 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1131 Returns true if the caller should proceed to merge the two, false
1132 if OLDDECL should simply be discarded. As a side effect, issues
1133 all necessary diagnostics for invalid or poor-style combinations.
1134 If it returns true, writes the types of NEWDECL and OLDDECL to
1135 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1136 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1139 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1140 tree *newtypep, tree *oldtypep)
1142 tree newtype, oldtype;
1143 bool pedwarned = false;
1144 bool warned = false;
1147 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1148 && DECL_EXTERNAL (DECL))
1150 /* If we have error_mark_node for either decl or type, just discard
1151 the previous decl - we're in an error cascade already. */
1152 if (olddecl == error_mark_node || newdecl == error_mark_node)
1154 *oldtypep = oldtype = TREE_TYPE (olddecl);
1155 *newtypep = newtype = TREE_TYPE (newdecl);
1156 if (oldtype == error_mark_node || newtype == error_mark_node)
1159 /* Two different categories of symbol altogether. This is an error
1160 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1161 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1163 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1164 && DECL_BUILT_IN (olddecl)
1165 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1167 error ("%q+D redeclared as different kind of symbol", newdecl);
1168 locate_old_decl (olddecl);
1170 else if (TREE_PUBLIC (newdecl))
1171 warning (0, "built-in function %q+D declared as non-function",
1174 warning (OPT_Wshadow, "declaration of %q+D shadows "
1175 "a built-in function", newdecl);
1179 /* Enumerators have no linkage, so may only be declared once in a
1181 if (TREE_CODE (olddecl) == CONST_DECL)
1183 error ("redeclaration of enumerator %q+D", newdecl);
1184 locate_old_decl (olddecl);
1188 if (!comptypes (oldtype, newtype))
1190 if (TREE_CODE (olddecl) == FUNCTION_DECL
1191 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1193 /* Accept harmless mismatch in function types.
1194 This is for the ffs and fprintf builtins. */
1195 tree trytype = match_builtin_function_types (newtype, oldtype);
1197 if (trytype && comptypes (newtype, trytype))
1198 *oldtypep = oldtype = trytype;
1201 /* If types don't match for a built-in, throw away the
1202 built-in. No point in calling locate_old_decl here, it
1203 won't print anything. */
1204 warning (0, "conflicting types for built-in function %q+D",
1209 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1210 && DECL_IS_BUILTIN (olddecl))
1212 /* A conflicting function declaration for a predeclared
1213 function that isn't actually built in. Objective C uses
1214 these. The new declaration silently overrides everything
1215 but the volatility (i.e. noreturn) indication. See also
1216 below. FIXME: Make Objective C use normal builtins. */
1217 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1220 /* Permit void foo (...) to match int foo (...) if the latter is
1221 the definition and implicit int was used. See
1222 c-torture/compile/920625-2.c. */
1223 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1224 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1225 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1226 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1228 pedwarned = pedwarn (0, "conflicting types for %q+D", newdecl);
1229 /* Make sure we keep void as the return type. */
1230 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1231 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1233 /* Permit void foo (...) to match an earlier call to foo (...) with
1234 no declared type (thus, implicitly int). */
1235 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1236 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1237 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1238 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1240 pedwarned = pedwarn (0, "conflicting types for %q+D", newdecl);
1241 /* Make sure we keep void as the return type. */
1242 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1246 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1247 error ("conflicting type qualifiers for %q+D", newdecl);
1249 error ("conflicting types for %q+D", newdecl);
1250 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1251 locate_old_decl (olddecl);
1256 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1257 but silently ignore the redeclaration if either is in a system
1258 header. (Conflicting redeclarations were handled above.) */
1259 if (TREE_CODE (newdecl) == TYPE_DECL)
1261 if (DECL_IN_SYSTEM_HEADER (newdecl)
1262 || DECL_IN_SYSTEM_HEADER (olddecl)
1263 || TREE_NO_WARNING (newdecl)
1264 || TREE_NO_WARNING (olddecl))
1265 return true; /* Allow OLDDECL to continue in use. */
1267 error ("redefinition of typedef %q+D", newdecl);
1268 locate_old_decl (olddecl);
1272 /* Function declarations can either be 'static' or 'extern' (no
1273 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1274 can never conflict with each other on account of linkage
1275 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1276 gnu89 mode permits two definitions if one is 'extern inline' and
1277 one is not. The non- extern-inline definition supersedes the
1278 extern-inline definition. */
1280 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1282 /* If you declare a built-in function name as static, or
1283 define the built-in with an old-style definition (so we
1284 can't validate the argument list) the built-in definition is
1285 overridden, but optionally warn this was a bad choice of name. */
1286 if (DECL_BUILT_IN (olddecl)
1287 && !C_DECL_DECLARED_BUILTIN (olddecl)
1288 && (!TREE_PUBLIC (newdecl)
1289 || (DECL_INITIAL (newdecl)
1290 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1292 warning (OPT_Wshadow, "declaration of %q+D shadows "
1293 "a built-in function", newdecl);
1294 /* Discard the old built-in function. */
1298 if (DECL_INITIAL (newdecl))
1300 if (DECL_INITIAL (olddecl))
1302 /* If both decls are in the same TU and the new declaration
1303 isn't overriding an extern inline reject the new decl.
1304 In c99, no overriding is allowed in the same translation
1306 if ((!DECL_EXTERN_INLINE (olddecl)
1307 || DECL_EXTERN_INLINE (newdecl)
1308 || (!flag_gnu89_inline
1309 && (!DECL_DECLARED_INLINE_P (olddecl)
1310 || !lookup_attribute ("gnu_inline",
1311 DECL_ATTRIBUTES (olddecl)))
1312 && (!DECL_DECLARED_INLINE_P (newdecl)
1313 || !lookup_attribute ("gnu_inline",
1314 DECL_ATTRIBUTES (newdecl))))
1316 && same_translation_unit_p (newdecl, olddecl))
1318 error ("redefinition of %q+D", newdecl);
1319 locate_old_decl (olddecl);
1324 /* If we have a prototype after an old-style function definition,
1325 the argument types must be checked specially. */
1326 else if (DECL_INITIAL (olddecl)
1327 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1328 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1329 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1331 locate_old_decl (olddecl);
1334 /* A non-static declaration (even an "extern") followed by a
1335 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1336 The same is true for a static forward declaration at block
1337 scope followed by a non-static declaration/definition at file
1338 scope. Static followed by non-static at the same scope is
1339 not undefined behavior, and is the most convenient way to get
1340 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1341 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1342 we do diagnose it if -Wtraditional. */
1343 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1345 /* Two exceptions to the rule. If olddecl is an extern
1346 inline, or a predeclared function that isn't actually
1347 built in, newdecl silently overrides olddecl. The latter
1348 occur only in Objective C; see also above. (FIXME: Make
1349 Objective C use normal builtins.) */
1350 if (!DECL_IS_BUILTIN (olddecl)
1351 && !DECL_EXTERN_INLINE (olddecl))
1353 error ("static declaration of %q+D follows "
1354 "non-static declaration", newdecl);
1355 locate_old_decl (olddecl);
1359 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1361 if (DECL_CONTEXT (olddecl))
1363 error ("non-static declaration of %q+D follows "
1364 "static declaration", newdecl);
1365 locate_old_decl (olddecl);
1368 else if (warn_traditional)
1370 warned |= warning (OPT_Wtraditional,
1371 "non-static declaration of %q+D "
1372 "follows static declaration", newdecl);
1376 /* Make sure gnu_inline attribute is either not present, or
1377 present on all inline decls. */
1378 if (DECL_DECLARED_INLINE_P (olddecl)
1379 && DECL_DECLARED_INLINE_P (newdecl))
1381 bool newa = lookup_attribute ("gnu_inline",
1382 DECL_ATTRIBUTES (newdecl)) != NULL;
1383 bool olda = lookup_attribute ("gnu_inline",
1384 DECL_ATTRIBUTES (olddecl)) != NULL;
1387 error ("%<gnu_inline%> attribute present on %q+D",
1388 newa ? newdecl : olddecl);
1389 error ("%Jbut not here", newa ? olddecl : newdecl);
1393 else if (TREE_CODE (newdecl) == VAR_DECL)
1395 /* Only variables can be thread-local, and all declarations must
1396 agree on this property. */
1397 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1399 /* Nothing to check. Since OLDDECL is marked threadprivate
1400 and NEWDECL does not have a thread-local attribute, we
1401 will merge the threadprivate attribute into NEWDECL. */
1404 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1406 if (DECL_THREAD_LOCAL_P (newdecl))
1407 error ("thread-local declaration of %q+D follows "
1408 "non-thread-local declaration", newdecl);
1410 error ("non-thread-local declaration of %q+D follows "
1411 "thread-local declaration", newdecl);
1413 locate_old_decl (olddecl);
1417 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1418 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1420 error ("redefinition of %q+D", newdecl);
1421 locate_old_decl (olddecl);
1425 /* Objects declared at file scope: if the first declaration had
1426 external linkage (even if it was an external reference) the
1427 second must have external linkage as well, or the behavior is
1428 undefined. If the first declaration had internal linkage, then
1429 the second must too, or else be an external reference (in which
1430 case the composite declaration still has internal linkage).
1431 As for function declarations, we warn about the static-then-
1432 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1433 if (DECL_FILE_SCOPE_P (newdecl)
1434 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1436 if (DECL_EXTERNAL (newdecl))
1438 if (!DECL_FILE_SCOPE_P (olddecl))
1440 error ("extern declaration of %q+D follows "
1441 "declaration with no linkage", newdecl);
1442 locate_old_decl (olddecl);
1445 else if (warn_traditional)
1447 warned |= warning (OPT_Wtraditional,
1448 "non-static declaration of %q+D "
1449 "follows static declaration", newdecl);
1454 if (TREE_PUBLIC (newdecl))
1455 error ("non-static declaration of %q+D follows "
1456 "static declaration", newdecl);
1458 error ("static declaration of %q+D follows "
1459 "non-static declaration", newdecl);
1461 locate_old_decl (olddecl);
1465 /* Two objects with the same name declared at the same block
1466 scope must both be external references (6.7p3). */
1467 else if (!DECL_FILE_SCOPE_P (newdecl))
1469 if (DECL_EXTERNAL (newdecl))
1471 /* Extern with initializer at block scope, which will
1472 already have received an error. */
1474 else if (DECL_EXTERNAL (olddecl))
1476 error ("declaration of %q+D with no linkage follows "
1477 "extern declaration", newdecl);
1478 locate_old_decl (olddecl);
1482 error ("redeclaration of %q+D with no linkage", newdecl);
1483 locate_old_decl (olddecl);
1491 /* All decls must agree on a visibility. */
1492 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1493 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1494 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1496 warned |= warning (0, "redeclaration of %q+D with different visibility "
1497 "(old visibility preserved)", newdecl);
1500 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1502 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1503 if (DECL_DECLARED_INLINE_P (newdecl)
1504 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1506 warned |= warning (OPT_Wattributes,
1507 "inline declaration of %qD follows "
1508 "declaration with attribute noinline", newdecl);
1510 else if (DECL_DECLARED_INLINE_P (olddecl)
1511 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1513 warned |= warning (OPT_Wattributes,
1514 "declaration of %q+D with attribute "
1515 "noinline follows inline declaration ", newdecl);
1518 else /* PARM_DECL, VAR_DECL */
1520 /* Redeclaration of a parameter is a constraint violation (this is
1521 not explicitly stated, but follows from C99 6.7p3 [no more than
1522 one declaration of the same identifier with no linkage in the
1523 same scope, except type tags] and 6.2.2p6 [parameters have no
1524 linkage]). We must check for a forward parameter declaration,
1525 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1526 an extension, the mandatory diagnostic for which is handled by
1527 mark_forward_parm_decls. */
1529 if (TREE_CODE (newdecl) == PARM_DECL
1530 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1532 error ("redefinition of parameter %q+D", newdecl);
1533 locate_old_decl (olddecl);
1538 /* Optional warning for completely redundant decls. */
1539 if (!warned && !pedwarned
1540 && warn_redundant_decls
1541 /* Don't warn about a function declaration followed by a
1543 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1544 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1545 /* Don't warn about redundant redeclarations of builtins. */
1546 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1547 && !DECL_BUILT_IN (newdecl)
1548 && DECL_BUILT_IN (olddecl)
1549 && !C_DECL_DECLARED_BUILTIN (olddecl))
1550 /* Don't warn about an extern followed by a definition. */
1551 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1552 /* Don't warn about forward parameter decls. */
1553 && !(TREE_CODE (newdecl) == PARM_DECL
1554 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1555 /* Don't warn about a variable definition following a declaration. */
1556 && !(TREE_CODE (newdecl) == VAR_DECL
1557 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1559 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1563 /* Report location of previous decl/defn. */
1564 if (warned || pedwarned)
1565 locate_old_decl (olddecl);
1567 #undef DECL_EXTERN_INLINE
1572 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1573 consistent with OLDDECL, but carries new information. Merge the
1574 new information into OLDDECL. This function issues no
1578 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1580 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1581 && DECL_INITIAL (newdecl) != 0);
1582 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1583 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1584 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1585 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1586 bool extern_changed = false;
1588 /* For real parm decl following a forward decl, rechain the old decl
1589 in its new location and clear TREE_ASM_WRITTEN (it's not a
1590 forward decl anymore). */
1591 if (TREE_CODE (newdecl) == PARM_DECL
1592 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1594 struct c_binding *b, **here;
1596 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1597 if ((*here)->decl == olddecl)
1604 b->prev = current_scope->bindings;
1605 current_scope->bindings = b;
1607 TREE_ASM_WRITTEN (olddecl) = 0;
1610 DECL_ATTRIBUTES (newdecl)
1611 = targetm.merge_decl_attributes (olddecl, newdecl);
1613 /* Merge the data types specified in the two decls. */
1615 = TREE_TYPE (olddecl)
1616 = composite_type (newtype, oldtype);
1618 /* Lay the type out, unless already done. */
1619 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1621 if (TREE_TYPE (newdecl) != error_mark_node)
1622 layout_type (TREE_TYPE (newdecl));
1623 if (TREE_CODE (newdecl) != FUNCTION_DECL
1624 && TREE_CODE (newdecl) != TYPE_DECL
1625 && TREE_CODE (newdecl) != CONST_DECL)
1626 layout_decl (newdecl, 0);
1630 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1631 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1632 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1633 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1634 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1636 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1637 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
1641 /* Keep the old rtl since we can safely use it. */
1642 if (HAS_RTL_P (olddecl))
1643 COPY_DECL_RTL (olddecl, newdecl);
1645 /* Merge the type qualifiers. */
1646 if (TREE_READONLY (newdecl))
1647 TREE_READONLY (olddecl) = 1;
1649 if (TREE_THIS_VOLATILE (newdecl))
1650 TREE_THIS_VOLATILE (olddecl) = 1;
1652 /* Merge deprecatedness. */
1653 if (TREE_DEPRECATED (newdecl))
1654 TREE_DEPRECATED (olddecl) = 1;
1656 /* If a decl is in a system header and the other isn't, keep the one on the
1657 system header. Otherwise, keep source location of definition rather than
1658 declaration and of prototype rather than non-prototype unless that
1659 prototype is built-in. */
1660 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1661 && DECL_IN_SYSTEM_HEADER (olddecl)
1662 && !DECL_IN_SYSTEM_HEADER (newdecl) )
1663 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1664 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1665 && DECL_IN_SYSTEM_HEADER (newdecl)
1666 && !DECL_IN_SYSTEM_HEADER (olddecl))
1667 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
1668 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1669 || (old_is_prototype && !new_is_prototype
1670 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1671 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1673 /* Merge the initialization information. */
1674 if (DECL_INITIAL (newdecl) == 0)
1675 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1677 /* Merge the threadprivate attribute. */
1678 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1680 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1681 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1684 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1686 /* Merge the section attribute.
1687 We want to issue an error if the sections conflict but that
1688 must be done later in decl_attributes since we are called
1689 before attributes are assigned. */
1690 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1691 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1693 /* Copy the assembler name.
1694 Currently, it can only be defined in the prototype. */
1695 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1697 /* Use visibility of whichever declaration had it specified */
1698 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1700 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1701 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1704 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1706 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1707 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1708 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1709 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1710 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1711 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1712 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1713 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1714 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1715 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1716 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1719 /* Merge the storage class information. */
1720 merge_weak (newdecl, olddecl);
1722 /* For functions, static overrides non-static. */
1723 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1725 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1726 /* This is since we don't automatically
1727 copy the attributes of NEWDECL into OLDDECL. */
1728 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1729 /* If this clears `static', clear it in the identifier too. */
1730 if (!TREE_PUBLIC (olddecl))
1731 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1735 /* In c99, 'extern' declaration before (or after) 'inline' means this
1736 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1738 if (TREE_CODE (newdecl) == FUNCTION_DECL
1739 && !flag_gnu89_inline
1740 && (DECL_DECLARED_INLINE_P (newdecl)
1741 || DECL_DECLARED_INLINE_P (olddecl))
1742 && (!DECL_DECLARED_INLINE_P (newdecl)
1743 || !DECL_DECLARED_INLINE_P (olddecl)
1744 || !DECL_EXTERNAL (olddecl))
1745 && DECL_EXTERNAL (newdecl)
1746 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
1747 && !current_function_decl)
1748 DECL_EXTERNAL (newdecl) = 0;
1750 if (DECL_EXTERNAL (newdecl))
1752 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1753 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1755 /* An extern decl does not override previous storage class. */
1756 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1757 if (!DECL_EXTERNAL (newdecl))
1759 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1760 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1765 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1766 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1769 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1771 /* If we're redefining a function previously defined as extern
1772 inline, make sure we emit debug info for the inline before we
1773 throw it away, in case it was inlined into a function that
1774 hasn't been written out yet. */
1775 if (new_is_definition && DECL_INITIAL (olddecl))
1777 if (TREE_USED (olddecl)
1778 /* We never inline re-defined extern inline functions.
1779 FIXME: This would be better handled by keeping both functions
1780 as separate declarations. */
1781 && cgraph_function_possibly_inlined_p (olddecl))
1782 (*debug_hooks->outlining_inline_function) (olddecl);
1784 /* The new defn must not be inline. */
1785 DECL_UNINLINABLE (newdecl) = 1;
1789 /* If either decl says `inline', this fn is inline, unless
1790 its definition was passed already. */
1791 if (DECL_DECLARED_INLINE_P (newdecl)
1792 || DECL_DECLARED_INLINE_P (olddecl))
1793 DECL_DECLARED_INLINE_P (newdecl) = 1;
1795 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1796 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1798 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1799 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1800 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1801 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1804 if (DECL_BUILT_IN (olddecl))
1806 /* If redeclaring a builtin function, it stays built in.
1807 But it gets tagged as having been declared. */
1808 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1809 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1810 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1811 if (new_is_prototype)
1812 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1814 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1815 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1818 /* Preserve function specific target and optimization options */
1819 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1820 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1821 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1822 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1824 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1825 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1826 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1827 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1829 /* Also preserve various other info from the definition. */
1830 if (!new_is_definition)
1832 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1833 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1834 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1835 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1836 gimple_set_body (newdecl, gimple_body (olddecl));
1837 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1839 /* See if we've got a function to instantiate from. */
1840 if (DECL_SAVED_TREE (olddecl))
1841 DECL_ABSTRACT_ORIGIN (newdecl)
1842 = DECL_ABSTRACT_ORIGIN (olddecl);
1846 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1848 /* Merge the USED information. */
1849 if (TREE_USED (olddecl))
1850 TREE_USED (newdecl) = 1;
1851 else if (TREE_USED (newdecl))
1852 TREE_USED (olddecl) = 1;
1854 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1855 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1857 unsigned olddecl_uid = DECL_UID (olddecl);
1858 tree olddecl_context = DECL_CONTEXT (olddecl);
1860 memcpy ((char *) olddecl + sizeof (struct tree_common),
1861 (char *) newdecl + sizeof (struct tree_common),
1862 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1863 switch (TREE_CODE (olddecl))
1866 gimple_set_body (olddecl, gimple_body (newdecl));
1876 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1877 (char *) newdecl + sizeof (struct tree_decl_common),
1878 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1883 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1884 (char *) newdecl + sizeof (struct tree_decl_common),
1885 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1887 DECL_UID (olddecl) = olddecl_uid;
1888 DECL_CONTEXT (olddecl) = olddecl_context;
1891 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1892 so that encode_section_info has a chance to look at the new decl
1893 flags and attributes. */
1894 if (DECL_RTL_SET_P (olddecl)
1895 && (TREE_CODE (olddecl) == FUNCTION_DECL
1896 || (TREE_CODE (olddecl) == VAR_DECL
1897 && TREE_STATIC (olddecl))))
1898 make_decl_rtl (olddecl);
1900 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1901 and the definition is coming from the old version, cgraph needs
1902 to be called again. */
1903 if (extern_changed && !new_is_definition
1904 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1905 cgraph_mark_if_needed (olddecl);
1908 /* Handle when a new declaration NEWDECL has the same name as an old
1909 one OLDDECL in the same binding contour. Prints an error message
1912 If safely possible, alter OLDDECL to look like NEWDECL, and return
1913 true. Otherwise, return false. */
1916 duplicate_decls (tree newdecl, tree olddecl)
1918 tree newtype = NULL, oldtype = NULL;
1920 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1922 /* Avoid `unused variable' and other warnings for OLDDECL. */
1923 TREE_NO_WARNING (olddecl) = 1;
1927 merge_decls (newdecl, olddecl, newtype, oldtype);
1932 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1934 warn_if_shadowing (tree new_decl)
1936 struct c_binding *b;
1938 /* Shadow warnings wanted? */
1940 /* No shadow warnings for internally generated vars. */
1941 || DECL_IS_BUILTIN (new_decl)
1942 /* No shadow warnings for vars made for inlining. */
1943 || DECL_FROM_INLINE (new_decl))
1946 /* Is anything being shadowed? Invisible decls do not count. */
1947 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1948 if (b->decl && b->decl != new_decl && !b->invisible)
1950 tree old_decl = b->decl;
1952 if (old_decl == error_mark_node)
1954 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1955 "non-variable", new_decl);
1958 else if (TREE_CODE (old_decl) == PARM_DECL)
1959 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1961 else if (DECL_FILE_SCOPE_P (old_decl))
1962 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1963 "declaration", new_decl);
1964 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1965 && DECL_BUILT_IN (old_decl))
1967 warning (OPT_Wshadow, "declaration of %q+D shadows "
1968 "a built-in function", new_decl);
1972 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1975 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1982 /* Subroutine of pushdecl.
1984 X is a TYPE_DECL for a typedef statement. Create a brand new
1985 ..._TYPE node (which will be just a variant of the existing
1986 ..._TYPE node with identical properties) and then install X
1987 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1989 The whole point here is to end up with a situation where each
1990 and every ..._TYPE node the compiler creates will be uniquely
1991 associated with AT MOST one node representing a typedef name.
1992 This way, even though the compiler substitutes corresponding
1993 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1994 early on, later parts of the compiler can always do the reverse
1995 translation and get back the corresponding typedef name. For
1998 typedef struct S MY_TYPE;
2001 Later parts of the compiler might only know that `object' was of
2002 type `struct S' if it were not for code just below. With this
2003 code however, later parts of the compiler see something like:
2005 struct S' == struct S
2006 typedef struct S' MY_TYPE;
2009 And they can then deduce (from the node for type struct S') that
2010 the original object declaration was:
2014 Being able to do this is important for proper support of protoize,
2015 and also for generating precise symbolic debugging information
2016 which takes full account of the programmer's (typedef) vocabulary.
2018 Obviously, we don't want to generate a duplicate ..._TYPE node if
2019 the TYPE_DECL node that we are now processing really represents a
2020 standard built-in type. */
2023 clone_underlying_type (tree x)
2025 if (DECL_IS_BUILTIN (x))
2027 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2028 TYPE_NAME (TREE_TYPE (x)) = x;
2030 else if (TREE_TYPE (x) != error_mark_node
2031 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2033 tree tt = TREE_TYPE (x);
2034 DECL_ORIGINAL_TYPE (x) = tt;
2035 tt = build_variant_type_copy (tt);
2037 TREE_USED (tt) = TREE_USED (x);
2042 /* Record a decl-node X as belonging to the current lexical scope.
2043 Check for errors (such as an incompatible declaration for the same
2044 name already seen in the same scope).
2046 Returns either X or an old decl for the same name.
2047 If an old decl is returned, it may have been smashed
2048 to agree with what X says. */
2053 tree name = DECL_NAME (x);
2054 struct c_scope *scope = current_scope;
2055 struct c_binding *b;
2056 bool nested = false;
2058 /* Must set DECL_CONTEXT for everything not at file scope or
2059 DECL_FILE_SCOPE_P won't work. Local externs don't count
2060 unless they have initializers (which generate code). */
2061 if (current_function_decl
2062 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2063 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2064 DECL_CONTEXT (x) = current_function_decl;
2066 /* If this is of variably modified type, prevent jumping into its
2068 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2069 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2070 c_begin_vm_scope (scope->depth);
2072 /* Anonymous decls are just inserted in the scope. */
2075 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2079 /* First, see if there is another declaration with the same name in
2080 the current scope. If there is, duplicate_decls may do all the
2081 work for us. If duplicate_decls returns false, that indicates
2082 two incompatible decls in the same scope; we are to silently
2083 replace the old one (duplicate_decls has issued all appropriate
2084 diagnostics). In particular, we should not consider possible
2085 duplicates in the external scope, or shadowing. */
2086 b = I_SYMBOL_BINDING (name);
2087 if (b && B_IN_SCOPE (b, scope))
2089 struct c_binding *b_ext, *b_use;
2090 tree type = TREE_TYPE (x);
2091 tree visdecl = b->decl;
2092 tree vistype = TREE_TYPE (visdecl);
2093 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2094 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2095 b->inner_comp = false;
2098 /* If this is an external linkage declaration, we should check
2099 for compatibility with the type in the external scope before
2100 setting the type at this scope based on the visible
2101 information only. */
2102 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2104 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2105 b_ext = b_ext->shadowed;
2110 TREE_TYPE (b_use->decl) = b_use->type;
2113 if (duplicate_decls (x, b_use->decl))
2117 /* Save the updated type in the external scope and
2118 restore the proper type for this scope. */
2120 if (comptypes (vistype, type))
2121 thistype = composite_type (vistype, type);
2123 thistype = TREE_TYPE (b_use->decl);
2124 b_use->type = TREE_TYPE (b_use->decl);
2125 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2126 && DECL_BUILT_IN (b_use->decl))
2128 = build_type_attribute_variant (thistype,
2131 TREE_TYPE (b_use->decl) = thistype;
2136 goto skip_external_and_shadow_checks;
2139 /* All declarations with external linkage, and all external
2140 references, go in the external scope, no matter what scope is
2141 current. However, the binding in that scope is ignored for
2142 purposes of normal name lookup. A separate binding structure is
2143 created in the requested scope; this governs the normal
2144 visibility of the symbol.
2146 The binding in the externals scope is used exclusively for
2147 detecting duplicate declarations of the same object, no matter
2148 what scope they are in; this is what we do here. (C99 6.2.7p2:
2149 All declarations that refer to the same object or function shall
2150 have compatible type; otherwise, the behavior is undefined.) */
2151 if (DECL_EXTERNAL (x) || scope == file_scope)
2153 tree type = TREE_TYPE (x);
2156 bool type_saved = false;
2157 if (b && !B_IN_EXTERNAL_SCOPE (b)
2158 && (TREE_CODE (b->decl) == FUNCTION_DECL
2159 || TREE_CODE (b->decl) == VAR_DECL)
2160 && DECL_FILE_SCOPE_P (b->decl))
2163 vistype = TREE_TYPE (visdecl);
2165 if (scope != file_scope
2166 && !DECL_IN_SYSTEM_HEADER (x))
2167 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2169 while (b && !B_IN_EXTERNAL_SCOPE (b))
2171 /* If this decl might be modified, save its type. This is
2172 done here rather than when the decl is first bound
2173 because the type may change after first binding, through
2174 being completed or through attributes being added. If we
2175 encounter multiple such decls, only the first should have
2176 its type saved; the others will already have had their
2177 proper types saved and the types will not have changed as
2178 their scopes will not have been re-entered. */
2179 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2181 b->type = TREE_TYPE (b->decl);
2184 if (B_IN_FILE_SCOPE (b)
2185 && TREE_CODE (b->decl) == VAR_DECL
2186 && TREE_STATIC (b->decl)
2187 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2188 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2189 && TREE_CODE (type) == ARRAY_TYPE
2190 && TYPE_DOMAIN (type)
2191 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2192 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2194 /* Array type completed in inner scope, which should be
2195 diagnosed if the completion does not have size 1 and
2196 it does not get completed in the file scope. */
2197 b->inner_comp = true;
2202 /* If a matching external declaration has been found, set its
2203 type to the composite of all the types of that declaration.
2204 After the consistency checks, it will be reset to the
2205 composite of the visible types only. */
2206 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2208 TREE_TYPE (b->decl) = b->type;
2210 /* The point of the same_translation_unit_p check here is,
2211 we want to detect a duplicate decl for a construct like
2212 foo() { extern bar(); } ... static bar(); but not if
2213 they are in different translation units. In any case,
2214 the static does not go in the externals scope. */
2216 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2217 && duplicate_decls (x, b->decl))
2222 if (comptypes (vistype, type))
2223 thistype = composite_type (vistype, type);
2225 thistype = TREE_TYPE (b->decl);
2229 b->type = TREE_TYPE (b->decl);
2230 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2232 = build_type_attribute_variant (thistype,
2233 TYPE_ATTRIBUTES (b->type));
2234 TREE_TYPE (b->decl) = thistype;
2235 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2238 else if (TREE_PUBLIC (x))
2240 if (visdecl && !b && duplicate_decls (x, visdecl))
2242 /* An external declaration at block scope referring to a
2243 visible entity with internal linkage. The composite
2244 type will already be correct for this scope, so we
2245 just need to fall through to make the declaration in
2252 bind (name, x, external_scope, /*invisible=*/true,
2259 if (TREE_CODE (x) != PARM_DECL)
2260 warn_if_shadowing (x);
2262 skip_external_and_shadow_checks:
2263 if (TREE_CODE (x) == TYPE_DECL)
2264 clone_underlying_type (x);
2266 bind (name, x, scope, /*invisible=*/false, nested);
2268 /* If x's type is incomplete because it's based on a
2269 structure or union which has not yet been fully declared,
2270 attach it to that structure or union type, so we can go
2271 back and complete the variable declaration later, if the
2272 structure or union gets fully declared.
2274 If the input is erroneous, we can have error_mark in the type
2275 slot (e.g. "f(void a, ...)") - that doesn't count as an
2277 if (TREE_TYPE (x) != error_mark_node
2278 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2280 tree element = TREE_TYPE (x);
2282 while (TREE_CODE (element) == ARRAY_TYPE)
2283 element = TREE_TYPE (element);
2284 element = TYPE_MAIN_VARIANT (element);
2286 if ((TREE_CODE (element) == RECORD_TYPE
2287 || TREE_CODE (element) == UNION_TYPE)
2288 && (TREE_CODE (x) != TYPE_DECL
2289 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2290 && !COMPLETE_TYPE_P (element))
2291 C_TYPE_INCOMPLETE_VARS (element)
2292 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2297 /* Record X as belonging to file scope.
2298 This is used only internally by the Objective-C front end,
2299 and is limited to its needs. duplicate_decls is not called;
2300 if there is any preexisting decl for this identifier, it is an ICE. */
2303 pushdecl_top_level (tree x)
2306 bool nested = false;
2307 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2309 name = DECL_NAME (x);
2311 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2313 if (TREE_PUBLIC (x))
2315 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2319 bind (name, x, file_scope, /*invisible=*/false, nested);
2325 implicit_decl_warning (tree id, tree olddecl)
2327 if (warn_implicit_function_declaration)
2332 warned = pedwarn (OPT_Wimplicit_function_declaration,
2333 G_("implicit declaration of function %qE"), id);
2335 warned = warning (OPT_Wimplicit_function_declaration,
2336 G_("implicit declaration of function %qE"), id);
2337 if (olddecl && warned)
2338 locate_old_decl (olddecl);
2342 /* Generate an implicit declaration for identifier FUNCTIONID as a
2343 function of type int (). */
2346 implicitly_declare (tree functionid)
2348 struct c_binding *b;
2352 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2354 if (B_IN_SCOPE (b, external_scope))
2363 if (decl == error_mark_node)
2366 /* FIXME: Objective-C has weird not-really-builtin functions
2367 which are supposed to be visible automatically. They wind up
2368 in the external scope because they're pushed before the file
2369 scope gets created. Catch this here and rebind them into the
2371 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2373 bind (functionid, decl, file_scope,
2374 /*invisible=*/false, /*nested=*/true);
2379 tree newtype = default_function_type;
2381 TREE_TYPE (decl) = b->type;
2382 /* Implicit declaration of a function already declared
2383 (somehow) in a different scope, or as a built-in.
2384 If this is the first time this has happened, warn;
2385 then recycle the old declaration but with the new type. */
2386 if (!C_DECL_IMPLICIT (decl))
2388 implicit_decl_warning (functionid, decl);
2389 C_DECL_IMPLICIT (decl) = 1;
2391 if (DECL_BUILT_IN (decl))
2393 newtype = build_type_attribute_variant (newtype,
2395 (TREE_TYPE (decl)));
2396 if (!comptypes (newtype, TREE_TYPE (decl)))
2398 warning (0, "incompatible implicit declaration of built-in"
2399 " function %qD", decl);
2400 newtype = TREE_TYPE (decl);
2405 if (!comptypes (newtype, TREE_TYPE (decl)))
2407 error ("incompatible implicit declaration of function %qD",
2409 locate_old_decl (decl);
2412 b->type = TREE_TYPE (decl);
2413 TREE_TYPE (decl) = newtype;
2414 bind (functionid, decl, current_scope,
2415 /*invisible=*/false, /*nested=*/true);
2420 /* Not seen before. */
2421 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2422 DECL_EXTERNAL (decl) = 1;
2423 TREE_PUBLIC (decl) = 1;
2424 C_DECL_IMPLICIT (decl) = 1;
2425 implicit_decl_warning (functionid, 0);
2426 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2428 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2430 /* C89 says implicit declarations are in the innermost block.
2431 So we record the decl in the standard fashion. */
2432 decl = pushdecl (decl);
2434 /* No need to call objc_check_decl here - it's a function type. */
2435 rest_of_decl_compilation (decl, 0, 0);
2437 /* Write a record describing this implicit function declaration
2438 to the prototypes file (if requested). */
2439 gen_aux_info_record (decl, 0, 1, 0);
2441 /* Possibly apply some default attributes to this implicit declaration. */
2442 decl_attributes (&decl, NULL_TREE, 0);
2447 /* Issue an error message for a reference to an undeclared variable
2448 ID, including a reference to a builtin outside of function-call
2449 context. Establish a binding of the identifier to error_mark_node
2450 in an appropriate scope, which will suppress further errors for the
2451 same identifier. The error message should be given location LOC. */
2453 undeclared_variable (tree id, location_t loc)
2455 static bool already = false;
2456 struct c_scope *scope;
2458 if (current_function_decl == 0)
2460 error ("%H%qE undeclared here (not in a function)", &loc, id);
2461 scope = current_scope;
2465 error ("%H%qE undeclared (first use in this function)", &loc, id);
2469 error ("%H(Each undeclared identifier is reported only once", &loc);
2470 error ("%Hfor each function it appears in.)", &loc);
2474 /* If we are parsing old-style parameter decls, current_function_decl
2475 will be nonnull but current_function_scope will be null. */
2476 scope = current_function_scope ? current_function_scope : current_scope;
2478 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2481 /* Subroutine of lookup_label, declare_label, define_label: construct a
2482 LABEL_DECL with all the proper frills. */
2485 make_label (tree name, location_t location)
2487 tree label = build_decl (LABEL_DECL, name, void_type_node);
2489 DECL_CONTEXT (label) = current_function_decl;
2490 DECL_MODE (label) = VOIDmode;
2491 DECL_SOURCE_LOCATION (label) = location;
2496 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2497 Create one if none exists so far for the current function.
2498 This is called when a label is used in a goto expression or
2499 has its address taken. */
2502 lookup_label (tree name)
2506 if (current_function_decl == 0)
2508 error ("label %qE referenced outside of any function", name);
2512 /* Use a label already defined or ref'd with this name, but not if
2513 it is inherited from a containing function and wasn't declared
2515 label = I_LABEL_DECL (name);
2516 if (label && (DECL_CONTEXT (label) == current_function_decl
2517 || C_DECLARED_LABEL_FLAG (label)))
2519 /* If the label has only been declared, update its apparent
2520 location to point here, for better diagnostics if it
2521 turns out not to have been defined. */
2522 if (!TREE_USED (label))
2523 DECL_SOURCE_LOCATION (label) = input_location;
2527 /* No label binding for that identifier; make one. */
2528 label = make_label (name, input_location);
2530 /* Ordinary labels go in the current function scope. */
2531 bind (name, label, current_function_scope,
2532 /*invisible=*/false, /*nested=*/false);
2536 /* Make a label named NAME in the current function, shadowing silently
2537 any that may be inherited from containing functions or containing
2538 scopes. This is called for __label__ declarations. */
2541 declare_label (tree name)
2543 struct c_binding *b = I_LABEL_BINDING (name);
2546 /* Check to make sure that the label hasn't already been declared
2548 if (b && B_IN_CURRENT_SCOPE (b))
2550 error ("duplicate label declaration %qE", name);
2551 locate_old_decl (b->decl);
2553 /* Just use the previous declaration. */
2557 label = make_label (name, input_location);
2558 C_DECLARED_LABEL_FLAG (label) = 1;
2560 /* Declared labels go in the current scope. */
2561 bind (name, label, current_scope,
2562 /*invisible=*/false, /*nested=*/false);
2566 /* Define a label, specifying the location in the source file.
2567 Return the LABEL_DECL node for the label, if the definition is valid.
2568 Otherwise return 0. */
2571 define_label (location_t location, tree name)
2573 /* Find any preexisting label with this name. It is an error
2574 if that label has already been defined in this function, or
2575 if there is a containing function with a declared label with
2577 tree label = I_LABEL_DECL (name);
2578 struct c_label_list *nlist_se, *nlist_vm;
2581 && ((DECL_CONTEXT (label) == current_function_decl
2582 && DECL_INITIAL (label) != 0)
2583 || (DECL_CONTEXT (label) != current_function_decl
2584 && C_DECLARED_LABEL_FLAG (label))))
2586 error ("%Hduplicate label %qD", &location, label);
2587 locate_old_decl (label);
2590 else if (label && DECL_CONTEXT (label) == current_function_decl)
2592 /* The label has been used or declared already in this function,
2593 but not defined. Update its location to point to this
2595 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2596 error ("%Jjump into statement expression", label);
2597 if (C_DECL_UNDEFINABLE_VM (label))
2598 error ("%Jjump into scope of identifier with variably modified type",
2600 DECL_SOURCE_LOCATION (label) = location;
2604 /* No label binding for that identifier; make one. */
2605 label = make_label (name, location);
2607 /* Ordinary labels go in the current function scope. */
2608 bind (name, label, current_function_scope,
2609 /*invisible=*/false, /*nested=*/false);
2612 if (!in_system_header && lookup_name (name))
2613 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2614 "for labels, identifier %qE conflicts", &location, name);
2616 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2617 nlist_se->next = label_context_stack_se->labels_def;
2618 nlist_se->label = label;
2619 label_context_stack_se->labels_def = nlist_se;
2621 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2622 nlist_vm->next = label_context_stack_vm->labels_def;
2623 nlist_vm->label = label;
2624 label_context_stack_vm->labels_def = nlist_vm;
2626 /* Mark label as having been defined. */
2627 DECL_INITIAL (label) = error_mark_node;
2631 /* Given NAME, an IDENTIFIER_NODE,
2632 return the structure (or union or enum) definition for that name.
2633 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2634 CODE says which kind of type the caller wants;
2635 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2636 If the wrong kind of type is found, an error is reported. */
2639 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2641 struct c_binding *b = I_TAG_BINDING (name);
2647 /* We only care about whether it's in this level if
2648 thislevel_only was set or it might be a type clash. */
2649 if (thislevel_only || TREE_CODE (b->decl) != code)
2651 /* For our purposes, a tag in the external scope is the same as
2652 a tag in the file scope. (Primarily relevant to Objective-C
2653 and its builtin structure tags, which get pushed before the
2654 file scope is created.) */
2655 if (B_IN_CURRENT_SCOPE (b)
2656 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2660 if (thislevel_only && !thislevel)
2663 if (TREE_CODE (b->decl) != code)
2665 /* Definition isn't the kind we were looking for. */
2666 pending_invalid_xref = name;
2667 pending_invalid_xref_location = input_location;
2669 /* If in the same binding level as a declaration as a tag
2670 of a different type, this must not be allowed to
2671 shadow that tag, so give the error immediately.
2672 (For example, "struct foo; union foo;" is invalid.) */
2674 pending_xref_error ();
2679 /* Print an error message now
2680 for a recent invalid struct, union or enum cross reference.
2681 We don't print them immediately because they are not invalid
2682 when used in the `struct foo;' construct for shadowing. */
2685 pending_xref_error (void)
2687 if (pending_invalid_xref != 0)
2688 error ("%H%qE defined as wrong kind of tag",
2689 &pending_invalid_xref_location, pending_invalid_xref);
2690 pending_invalid_xref = 0;
2694 /* Look up NAME in the current scope and its superiors
2695 in the namespace of variables, functions and typedefs.
2696 Return a ..._DECL node of some kind representing its definition,
2697 or return 0 if it is undefined. */
2700 lookup_name (tree name)
2702 struct c_binding *b = I_SYMBOL_BINDING (name);
2703 if (b && !b->invisible)
2708 /* Similar to `lookup_name' but look only at the indicated scope. */
2711 lookup_name_in_scope (tree name, struct c_scope *scope)
2713 struct c_binding *b;
2715 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2716 if (B_IN_SCOPE (b, scope))
2721 /* Create the predefined scalar types of C,
2722 and some nodes representing standard constants (0, 1, (void *) 0).
2723 Initialize the global scope.
2724 Make definitions for built-in primitive functions. */
2727 c_init_decl_processing (void)
2729 location_t save_loc = input_location;
2731 /* Initialize reserved words for parser. */
2734 current_function_decl = 0;
2736 gcc_obstack_init (&parser_obstack);
2738 /* Make the externals scope. */
2740 external_scope = current_scope;
2742 /* Declarations from c_common_nodes_and_builtins must not be associated
2743 with this input file, lest we get differences between using and not
2744 using preprocessed headers. */
2745 input_location = BUILTINS_LOCATION;
2747 build_common_tree_nodes (flag_signed_char, false);
2749 c_common_nodes_and_builtins ();
2751 /* In C, comparisons and TRUTH_* expressions have type int. */
2752 truthvalue_type_node = integer_type_node;
2753 truthvalue_true_node = integer_one_node;
2754 truthvalue_false_node = integer_zero_node;
2756 /* Even in C99, which has a real boolean type. */
2757 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2758 boolean_type_node));
2760 input_location = save_loc;
2762 pedantic_lvalues = true;
2764 make_fname_decl = c_make_fname_decl;
2765 start_fname_decls ();
2768 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2769 decl, NAME is the initialization string and TYPE_DEP indicates whether
2770 NAME depended on the type of the function. As we don't yet implement
2771 delayed emission of static data, we mark the decl as emitted
2772 so it is not placed in the output. Anything using it must therefore pull
2773 out the STRING_CST initializer directly. FIXME. */
2776 c_make_fname_decl (tree id, int type_dep)
2778 const char *name = fname_as_string (type_dep);
2779 tree decl, type, init;
2780 size_t length = strlen (name);
2782 type = build_array_type (char_type_node,
2783 build_index_type (size_int (length)));
2784 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2786 decl = build_decl (VAR_DECL, id, type);
2788 TREE_STATIC (decl) = 1;
2789 TREE_READONLY (decl) = 1;
2790 DECL_ARTIFICIAL (decl) = 1;
2792 init = build_string (length + 1, name);
2793 free (CONST_CAST (char *, name));
2794 TREE_TYPE (init) = type;
2795 DECL_INITIAL (decl) = init;
2797 TREE_USED (decl) = 1;
2799 if (current_function_decl
2800 /* For invalid programs like this:
2803 const char* p = __FUNCTION__;
2805 the __FUNCTION__ is believed to appear in K&R style function
2806 parameter declarator. In that case we still don't have
2808 && (!errorcount || current_function_scope))
2810 DECL_CONTEXT (decl) = current_function_decl;
2811 bind (id, decl, current_function_scope,
2812 /*invisible=*/false, /*nested=*/false);
2815 finish_decl (decl, init, NULL_TREE);
2821 c_builtin_function (tree decl)
2823 tree type = TREE_TYPE (decl);
2824 tree id = DECL_NAME (decl);
2826 const char *name = IDENTIFIER_POINTER (id);
2827 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2829 /* Should never be called on a symbol with a preexisting meaning. */
2830 gcc_assert (!I_SYMBOL_BINDING (id));
2832 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2834 /* Builtins in the implementation namespace are made visible without
2835 needing to be explicitly declared. See push_file_scope. */
2836 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2838 TREE_CHAIN (decl) = visible_builtins;
2839 visible_builtins = decl;
2845 /* Called when a declaration is seen that contains no names to declare.
2846 If its type is a reference to a structure, union or enum inherited
2847 from a containing scope, shadow that tag name for the current scope
2848 with a forward reference.
2849 If its type defines a new named structure or union
2850 or defines an enum, it is valid but we need not do anything here.
2851 Otherwise, it is an error. */
2854 shadow_tag (const struct c_declspecs *declspecs)
2856 shadow_tag_warned (declspecs, 0);
2859 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2862 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2864 bool found_tag = false;
2866 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2868 tree value = declspecs->type;
2869 enum tree_code code = TREE_CODE (value);
2871 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2872 /* Used to test also that TYPE_SIZE (value) != 0.
2873 That caused warning for `struct foo;' at top level in the file. */
2875 tree name = TYPE_NAME (value);
2882 if (warned != 1 && code != ENUMERAL_TYPE)
2883 /* Empty unnamed enum OK */
2885 pedwarn (0, "unnamed struct/union that defines no instances");
2889 else if (!declspecs->tag_defined_p
2890 && declspecs->storage_class != csc_none)
2893 pedwarn (0, "empty declaration with storage class specifier "
2894 "does not redeclare tag");
2896 pending_xref_error ();
2898 else if (!declspecs->tag_defined_p
2899 && (declspecs->const_p
2900 || declspecs->volatile_p
2901 || declspecs->restrict_p))
2904 pedwarn (0, "empty declaration with type qualifier "
2905 "does not redeclare tag");
2907 pending_xref_error ();
2911 pending_invalid_xref = 0;
2912 t = lookup_tag (code, name, 1);
2916 t = make_node (code);
2923 if (warned != 1 && !in_system_header)
2925 pedwarn (0, "useless type name in empty declaration");
2930 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2932 pedwarn (0, "useless type name in empty declaration");
2936 pending_invalid_xref = 0;
2938 if (declspecs->inline_p)
2940 error ("%<inline%> in empty declaration");
2944 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2946 error ("%<auto%> in file-scope empty declaration");
2950 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2952 error ("%<register%> in file-scope empty declaration");
2956 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2958 warning (0, "useless storage class specifier in empty declaration");
2962 if (!warned && !in_system_header && declspecs->thread_p)
2964 warning (0, "useless %<__thread%> in empty declaration");
2968 if (!warned && !in_system_header && (declspecs->const_p
2969 || declspecs->volatile_p
2970 || declspecs->restrict_p))
2972 warning (0, "useless type qualifier in empty declaration");
2979 pedwarn (0, "empty declaration");
2984 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2985 bits. SPECS represents declaration specifiers that the grammar
2986 only permits to contain type qualifiers and attributes. */
2989 quals_from_declspecs (const struct c_declspecs *specs)
2991 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2992 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2993 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2994 gcc_assert (!specs->type
2995 && !specs->decl_attr
2996 && specs->typespec_word == cts_none
2997 && specs->storage_class == csc_none
2998 && !specs->typedef_p
2999 && !specs->explicit_signed_p
3000 && !specs->deprecated_p
3002 && !specs->long_long_p
3005 && !specs->unsigned_p
3006 && !specs->complex_p
3008 && !specs->thread_p);
3012 /* Construct an array declarator. EXPR is the expression inside [],
3013 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3014 applied to the pointer to which a parameter array is converted).
3015 STATIC_P is true if "static" is inside the [], false otherwise.
3016 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3017 length which is nevertheless a complete type, false otherwise. The
3018 field for the contained declarator is left to be filled in by
3019 set_array_declarator_inner. */
3021 struct c_declarator *
3022 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3025 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3026 struct c_declarator);
3027 declarator->kind = cdk_array;
3028 declarator->declarator = 0;
3029 declarator->u.array.dimen = expr;
3032 declarator->u.array.attrs = quals->attrs;
3033 declarator->u.array.quals = quals_from_declspecs (quals);
3037 declarator->u.array.attrs = NULL_TREE;
3038 declarator->u.array.quals = 0;
3040 declarator->u.array.static_p = static_p;
3041 declarator->u.array.vla_unspec_p = vla_unspec_p;
3044 if (static_p || quals != NULL)
3045 pedwarn (OPT_pedantic, "ISO C90 does not support %<static%> or type "
3046 "qualifiers in parameter array declarators");
3048 pedwarn (OPT_pedantic, "ISO C90 does not support %<[*]%> array declarators");
3052 if (!current_scope->parm_flag)
3055 error ("%<[*]%> not allowed in other than function prototype scope");
3056 declarator->u.array.vla_unspec_p = false;
3059 current_scope->had_vla_unspec = true;
3064 /* Set the contained declarator of an array declarator. DECL is the
3065 declarator, as constructed by build_array_declarator; INNER is what
3066 appears on the left of the []. */
3068 struct c_declarator *
3069 set_array_declarator_inner (struct c_declarator *decl,
3070 struct c_declarator *inner)
3072 decl->declarator = inner;
3076 /* INIT is a constructor that forms DECL's initializer. If the final
3077 element initializes a flexible array field, add the size of that
3078 initializer to DECL's size. */
3081 add_flexible_array_elts_to_size (tree decl, tree init)
3085 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3088 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3089 type = TREE_TYPE (elt);
3090 if (TREE_CODE (type) == ARRAY_TYPE
3091 && TYPE_SIZE (type) == NULL_TREE
3092 && TYPE_DOMAIN (type) != NULL_TREE
3093 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3095 complete_array_type (&type, elt, false);
3097 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3098 DECL_SIZE_UNIT (decl)
3099 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3103 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3106 groktypename (struct c_type_name *type_name)
3109 tree attrs = type_name->specs->attrs;
3111 type_name->specs->attrs = NULL_TREE;
3113 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3114 false, NULL, &attrs, DEPRECATED_NORMAL);
3116 /* Apply attributes. */
3117 decl_attributes (&type, attrs, 0);
3122 /* Decode a declarator in an ordinary declaration or data definition.
3123 This is called as soon as the type information and variable name
3124 have been parsed, before parsing the initializer if any.
3125 Here we create the ..._DECL node, fill in its type,
3126 and put it on the list of decls for the current context.
3127 The ..._DECL node is returned as the value.
3129 Exception: for arrays where the length is not specified,
3130 the type is left null, to be filled in by `finish_decl'.
3132 Function definitions do not come here; they go to start_function
3133 instead. However, external and forward declarations of functions
3134 do go through here. Structure field declarations are done by
3135 grokfield and not through here. */
3138 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3139 bool initialized, tree attributes)
3143 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3145 /* An object declared as __attribute__((deprecated)) suppresses
3146 warnings of uses of other deprecated items. */
3147 if (lookup_attribute ("deprecated", attributes))
3148 deprecated_state = DEPRECATED_SUPPRESS;
3150 decl = grokdeclarator (declarator, declspecs,
3151 NORMAL, initialized, NULL, &attributes,
3156 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3157 && MAIN_NAME_P (DECL_NAME (decl)))
3158 warning (OPT_Wmain, "%q+D is usually a function", decl);
3161 /* Is it valid for this decl to have an initializer at all?
3162 If not, set INITIALIZED to zero, which will indirectly
3163 tell 'finish_decl' to ignore the initializer once it is parsed. */
3164 switch (TREE_CODE (decl))
3167 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3172 error ("function %qD is initialized like a variable", decl);
3177 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3178 error ("parameter %qD is initialized", decl);
3183 /* Don't allow initializations for incomplete types except for
3184 arrays which might be completed by the initialization. */
3186 /* This can happen if the array size is an undefined macro.
3187 We already gave a warning, so we don't need another one. */
3188 if (TREE_TYPE (decl) == error_mark_node)
3190 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3192 /* A complete type is ok if size is fixed. */
3194 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3195 || C_DECL_VARIABLE_SIZE (decl))
3197 error ("variable-sized object may not be initialized");
3201 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3203 error ("variable %qD has initializer but incomplete type", decl);
3206 else if (C_DECL_VARIABLE_SIZE (decl))
3208 /* Although C99 is unclear about whether incomplete arrays
3209 of VLAs themselves count as VLAs, it does not make
3210 sense to permit them to be initialized given that
3211 ordinary VLAs may not be initialized. */
3212 error ("variable-sized object may not be initialized");
3219 if (current_scope == file_scope)
3220 TREE_STATIC (decl) = 1;
3222 /* Tell 'pushdecl' this is an initialized decl
3223 even though we don't yet have the initializer expression.
3224 Also tell 'finish_decl' it may store the real initializer. */
3225 DECL_INITIAL (decl) = error_mark_node;
3228 /* If this is a function declaration, write a record describing it to the
3229 prototypes file (if requested). */
3231 if (TREE_CODE (decl) == FUNCTION_DECL)
3232 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3234 /* ANSI specifies that a tentative definition which is not merged with
3235 a non-tentative definition behaves exactly like a definition with an
3236 initializer equal to zero. (Section 3.7.2)
3238 -fno-common gives strict ANSI behavior, though this tends to break
3239 a large body of code that grew up without this rule.
3241 Thread-local variables are never common, since there's no entrenched
3242 body of code to break, and it allows more efficient variable references
3243 in the presence of dynamic linking. */
3245 if (TREE_CODE (decl) == VAR_DECL
3247 && TREE_PUBLIC (decl)
3248 && !DECL_THREAD_LOCAL_P (decl)
3250 DECL_COMMON (decl) = 1;
3252 /* Set attributes here so if duplicate decl, will have proper attributes. */
3253 decl_attributes (&decl, attributes, 0);
3255 /* Handle gnu_inline attribute. */
3256 if (declspecs->inline_p
3257 && !flag_gnu89_inline
3258 && TREE_CODE (decl) == FUNCTION_DECL
3259 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
3260 || current_function_decl))
3262 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3264 else if (declspecs->storage_class != csc_static)
3265 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3268 if (TREE_CODE (decl) == FUNCTION_DECL
3269 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3271 struct c_declarator *ce = declarator;
3273 if (ce->kind == cdk_pointer)
3274 ce = declarator->declarator;
3275 if (ce->kind == cdk_function)
3277 tree args = ce->u.arg_info->parms;
3278 for (; args; args = TREE_CHAIN (args))
3280 tree type = TREE_TYPE (args);
3281 if (type && INTEGRAL_TYPE_P (type)
3282 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3283 DECL_ARG_TYPE (args) = integer_type_node;
3288 if (TREE_CODE (decl) == FUNCTION_DECL
3289 && DECL_DECLARED_INLINE_P (decl)
3290 && DECL_UNINLINABLE (decl)
3291 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3292 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3295 /* C99 6.7.4p3: An inline definition of a function with external
3296 linkage shall not contain a definition of a modifiable object
3297 with static storage duration... */
3298 if (TREE_CODE (decl) == VAR_DECL
3299 && current_scope != file_scope
3300 && TREE_STATIC (decl)
3301 && !TREE_READONLY (decl)
3302 && DECL_DECLARED_INLINE_P (current_function_decl)
3303 && DECL_EXTERNAL (current_function_decl))
3304 pedwarn (0, "%q+D is static but declared in inline function %qD "
3305 "which is not static", decl, current_function_decl);
3307 /* Add this decl to the current scope.
3308 TEM may equal DECL or it may be a previous decl of the same name. */
3309 tem = pushdecl (decl);
3311 if (initialized && DECL_EXTERNAL (tem))
3313 DECL_EXTERNAL (tem) = 0;
3314 TREE_STATIC (tem) = 1;
3320 /* Initialize EH if not initialized yet and exceptions are enabled. */
3323 c_maybe_initialize_eh (void)
3325 if (!flag_exceptions || c_eh_initialized_p)
3328 c_eh_initialized_p = true;
3329 eh_personality_libfunc
3330 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3331 ? "__gcc_personality_sj0"
3332 : "__gcc_personality_v0");
3333 default_init_unwind_resume_libfunc ();
3334 using_eh_for_cleanups ();
3337 /* Finish processing of a declaration;
3338 install its initial value.
3339 If the length of an array type is not known before,
3340 it must be determined now, from the initial value, or it is an error. */
3343 finish_decl (tree decl, tree init, tree asmspec_tree)
3346 int was_incomplete = (DECL_SIZE (decl) == 0);
3347 const char *asmspec = 0;
3349 /* If a name was specified, get the string. */
3350 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3351 && DECL_FILE_SCOPE_P (decl))
3352 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3354 asmspec = TREE_STRING_POINTER (asmspec_tree);
3356 /* If `start_decl' didn't like having an initialization, ignore it now. */
3357 if (init != 0 && DECL_INITIAL (decl) == 0)
3360 /* Don't crash if parm is initialized. */
3361 if (TREE_CODE (decl) == PARM_DECL)
3365 store_init_value (decl, init);
3367 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3368 || TREE_CODE (decl) == FUNCTION_DECL
3369 || TREE_CODE (decl) == FIELD_DECL))
3370 objc_check_decl (decl);
3372 type = TREE_TYPE (decl);
3374 /* Deduce size of array from initialization, if not already known. */
3375 if (TREE_CODE (type) == ARRAY_TYPE
3376 && TYPE_DOMAIN (type) == 0
3377 && TREE_CODE (decl) != TYPE_DECL)
3380 = (TREE_STATIC (decl)
3381 /* Even if pedantic, an external linkage array
3382 may have incomplete type at first. */
3383 ? pedantic && !TREE_PUBLIC (decl)
3384 : !DECL_EXTERNAL (decl));
3386 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3389 /* Get the completed type made by complete_array_type. */
3390 type = TREE_TYPE (decl);
3395 error ("initializer fails to determine size of %q+D", decl);
3400 error ("array size missing in %q+D", decl);
3401 /* If a `static' var's size isn't known,
3402 make it extern as well as static, so it does not get
3404 If it is not `static', then do not mark extern;
3405 finish_incomplete_decl will give it a default size
3406 and it will get allocated. */
3407 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3408 DECL_EXTERNAL (decl) = 1;
3412 error ("zero or negative size array %q+D", decl);
3416 /* For global variables, update the copy of the type that
3417 exists in the binding. */
3418 if (TREE_PUBLIC (decl))
3420 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3421 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3422 b_ext = b_ext->shadowed;
3426 b_ext->type = composite_type (b_ext->type, type);
3437 if (DECL_INITIAL (decl))
3438 TREE_TYPE (DECL_INITIAL (decl)) = type;
3440 layout_decl (decl, 0);
3443 if (TREE_CODE (decl) == VAR_DECL)
3445 if (init && TREE_CODE (init) == CONSTRUCTOR)
3446 add_flexible_array_elts_to_size (decl, init);
3448 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3449 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3450 layout_decl (decl, 0);
3452 if (DECL_SIZE (decl) == 0
3453 /* Don't give an error if we already gave one earlier. */
3454 && TREE_TYPE (decl) != error_mark_node
3455 && (TREE_STATIC (decl)
3456 /* A static variable with an incomplete type
3457 is an error if it is initialized.
3458 Also if it is not file scope.
3459 Otherwise, let it through, but if it is not `extern'
3460 then it may cause an error message later. */
3461 ? (DECL_INITIAL (decl) != 0
3462 || !DECL_FILE_SCOPE_P (decl))
3463 /* An automatic variable with an incomplete type
3465 : !DECL_EXTERNAL (decl)))
3467 error ("storage size of %q+D isn%'t known", decl);
3468 TREE_TYPE (decl) = error_mark_node;
3471 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3472 && DECL_SIZE (decl) != 0)
3474 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3475 constant_expression_warning (DECL_SIZE (decl));
3478 error ("storage size of %q+D isn%'t constant", decl);
3479 TREE_TYPE (decl) = error_mark_node;
3483 if (TREE_USED (type))
3484 TREE_USED (decl) = 1;
3487 /* If this is a function and an assembler name is specified, reset DECL_RTL
3488 so we can give it its new name. Also, update built_in_decls if it
3489 was a normal built-in. */
3490 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3492 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3493 set_builtin_user_assembler_name (decl, asmspec);
3494 set_user_assembler_name (decl, asmspec);
3497 /* If #pragma weak was used, mark the decl weak now. */
3498 maybe_apply_pragma_weak (decl);
3500 /* Output the assembler code and/or RTL code for variables and functions,
3501 unless the type is an undefined structure or union.
3502 If not, it will get done when the type is completed. */
3504 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3506 /* Determine the ELF visibility. */
3507 if (TREE_PUBLIC (decl))
3508 c_determine_visibility (decl);
3510 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3511 if (c_dialect_objc ())
3512 objc_check_decl (decl);
3516 /* If this is not a static variable, issue a warning.
3517 It doesn't make any sense to give an ASMSPEC for an
3518 ordinary, non-register local variable. Historically,
3519 GCC has accepted -- but ignored -- the ASMSPEC in
3521 if (!DECL_FILE_SCOPE_P (decl)
3522 && TREE_CODE (decl) == VAR_DECL
3523 && !C_DECL_REGISTER (decl)
3524 && !TREE_STATIC (decl))
3525 warning (0, "ignoring asm-specifier for non-static local "
3526 "variable %q+D", decl);
3528 set_user_assembler_name (decl, asmspec);
3531 if (DECL_FILE_SCOPE_P (decl))
3533 if (DECL_INITIAL (decl) == NULL_TREE
3534 || DECL_INITIAL (decl) == error_mark_node)
3535 /* Don't output anything
3536 when a tentative file-scope definition is seen.
3537 But at end of compilation, do output code for them. */
3538 DECL_DEFER_OUTPUT (decl) = 1;
3539 rest_of_decl_compilation (decl, true, 0);
3543 /* In conjunction with an ASMSPEC, the `register'
3544 keyword indicates that we should place the variable
3545 in a particular register. */
3546 if (asmspec && C_DECL_REGISTER (decl))
3548 DECL_HARD_REGISTER (decl) = 1;
3549 /* This cannot be done for a structure with volatile
3550 fields, on which DECL_REGISTER will have been
3552 if (!DECL_REGISTER (decl))
3553 error ("cannot put object with volatile field into register");
3556 if (TREE_CODE (decl) != FUNCTION_DECL)
3558 /* If we're building a variable sized type, and we might be
3559 reachable other than via the top of the current binding
3560 level, then create a new BIND_EXPR so that we deallocate
3561 the object at the right time. */
3562 /* Note that DECL_SIZE can be null due to errors. */
3563 if (DECL_SIZE (decl)
3564 && !TREE_CONSTANT (DECL_SIZE (decl))
3565 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3568 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3569 TREE_SIDE_EFFECTS (bind) = 1;
3571 BIND_EXPR_BODY (bind) = push_stmt_list ();
3573 add_stmt (build_stmt (DECL_EXPR, decl));
3578 if (!DECL_FILE_SCOPE_P (decl))
3580 /* Recompute the RTL of a local array now
3581 if it used to be an incomplete type. */
3583 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3585 /* If we used it already as memory, it must stay in memory. */
3586 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3587 /* If it's still incomplete now, no init will save it. */
3588 if (DECL_SIZE (decl) == 0)
3589 DECL_INITIAL (decl) = 0;
3594 if (TREE_CODE (decl) == TYPE_DECL)
3596 if (!DECL_FILE_SCOPE_P (decl)
3597 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3598 add_stmt (build_stmt (DECL_EXPR, decl));
3600 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3603 /* At the end of a declaration, throw away any variable type sizes
3604 of types defined inside that declaration. There is no use
3605 computing them in the following function definition. */
3606 if (current_scope == file_scope)
3607 get_pending_sizes ();
3609 /* Install a cleanup (aka destructor) if one was given. */
3610 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3612 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3615 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3616 tree cleanup_decl = lookup_name (cleanup_id);
3619 /* Build "cleanup(&decl)" for the destructor. */
3620 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3621 cleanup = build_tree_list (NULL_TREE, cleanup);
3622 cleanup = build_function_call (cleanup_decl, cleanup);
3624 /* Don't warn about decl unused; the cleanup uses it. */
3625 TREE_USED (decl) = 1;
3626 TREE_USED (cleanup_decl) = 1;
3628 /* Initialize EH, if we've been told to do so. */
3629 c_maybe_initialize_eh ();
3631 push_cleanup (decl, cleanup, false);
3636 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3639 grokparm (const struct c_parm *parm)
3641 tree attrs = parm->attrs;
3642 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3643 NULL, &attrs, DEPRECATED_NORMAL);
3645 decl_attributes (&decl, attrs, 0);
3650 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3651 and push that on the current scope. */
3654 push_parm_decl (const struct c_parm *parm)
3656 tree attrs = parm->attrs;
3659 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3660 &attrs, DEPRECATED_NORMAL);
3661 decl_attributes (&decl, attrs, 0);
3663 decl = pushdecl (decl);
3665 finish_decl (decl, NULL_TREE, NULL_TREE);
3668 /* Mark all the parameter declarations to date as forward decls.
3669 Also diagnose use of this extension. */
3672 mark_forward_parm_decls (void)
3674 struct c_binding *b;
3676 if (pedantic && !current_scope->warned_forward_parm_decls)
3678 pedwarn (OPT_pedantic, "ISO C forbids forward parameter declarations");
3679 current_scope->warned_forward_parm_decls = true;
3682 for (b = current_scope->bindings; b; b = b->prev)
3683 if (TREE_CODE (b->decl) == PARM_DECL)
3684 TREE_ASM_WRITTEN (b->decl) = 1;
3687 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3688 literal, which may be an incomplete array type completed by the
3689 initializer; INIT is a CONSTRUCTOR that initializes the compound
3693 build_compound_literal (tree type, tree init)
3695 /* We do not use start_decl here because we have a type, not a declarator;
3696 and do not use finish_decl because the decl should be stored inside
3697 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3702 if (type == error_mark_node)
3703 return error_mark_node;
3705 decl = build_decl (VAR_DECL, NULL_TREE, type);
3706 DECL_EXTERNAL (decl) = 0;
3707 TREE_PUBLIC (decl) = 0;
3708 TREE_STATIC (decl) = (current_scope == file_scope);
3709 DECL_CONTEXT (decl) = current_function_decl;
3710 TREE_USED (decl) = 1;
3711 TREE_TYPE (decl) = type;
3712 TREE_READONLY (decl) = TYPE_READONLY (type);
3713 store_init_value (decl, init);
3715 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3717 int failure = complete_array_type (&TREE_TYPE (decl),
3718 DECL_INITIAL (decl), true);
3719 gcc_assert (!failure);
3721 type = TREE_TYPE (decl);
3722 TREE_TYPE (DECL_INITIAL (decl)) = type;
3725 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3726 return error_mark_node;
3728 stmt = build_stmt (DECL_EXPR, decl);
3729 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3730 TREE_SIDE_EFFECTS (complit) = 1;
3732 layout_decl (decl, 0);
3734 if (TREE_STATIC (decl))
3736 /* This decl needs a name for the assembler output. */
3737 set_compound_literal_name (decl);
3738 DECL_DEFER_OUTPUT (decl) = 1;
3739 DECL_COMDAT (decl) = 1;
3740 DECL_ARTIFICIAL (decl) = 1;
3741 DECL_IGNORED_P (decl) = 1;
3743 rest_of_decl_compilation (decl, 1, 0);
3749 /* Determine whether TYPE is a structure with a flexible array member,
3750 or a union containing such a structure (possibly recursively). */
3753 flexible_array_type_p (tree type)
3756 switch (TREE_CODE (type))
3759 x = TYPE_FIELDS (type);
3762 while (TREE_CHAIN (x) != NULL_TREE)
3764 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3765 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3766 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3767 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3771 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3773 if (flexible_array_type_p (TREE_TYPE (x)))
3782 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3783 replacing with appropriate values if they are invalid. */
3785 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3788 unsigned int max_width;
3789 unsigned HOST_WIDE_INT w;
3790 const char *name = orig_name ? orig_name: _("<anonymous>");
3792 /* Detect and ignore out of range field width and process valid
3794 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3795 || TREE_CODE (*width) != INTEGER_CST)
3797 error ("bit-field %qs width not an integer constant", name);
3798 *width = integer_one_node;
3802 constant_expression_warning (*width);
3803 if (tree_int_cst_sgn (*width) < 0)
3805 error ("negative width in bit-field %qs", name);
3806 *width = integer_one_node;
3808 else if (integer_zerop (*width) && orig_name)
3810 error ("zero width for bit-field %qs", name);
3811 *width = integer_one_node;
3815 /* Detect invalid bit-field type. */
3816 if (TREE_CODE (*type) != INTEGER_TYPE
3817 && TREE_CODE (*type) != BOOLEAN_TYPE
3818 && TREE_CODE (*type) != ENUMERAL_TYPE)
3820 error ("bit-field %qs has invalid type", name);
3821 *type = unsigned_type_node;
3824 type_mv = TYPE_MAIN_VARIANT (*type);
3825 if (!in_system_header
3826 && type_mv != integer_type_node
3827 && type_mv != unsigned_type_node
3828 && type_mv != boolean_type_node)
3829 pedwarn (OPT_pedantic, "type of bit-field %qs is a GCC extension", name);
3831 max_width = TYPE_PRECISION (*type);
3833 if (0 < compare_tree_int (*width, max_width))
3835 error ("width of %qs exceeds its type", name);
3837 *width = build_int_cst (NULL_TREE, w);
3840 w = tree_low_cst (*width, 1);
3842 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3844 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3846 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3847 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3848 warning (0, "%qs is narrower than values of its type", name);
3854 /* Print warning about variable length array if necessary. */
3857 warn_variable_length_array (const char *name, tree size)
3859 int const_size = TREE_CONSTANT (size);
3861 if (!flag_isoc99 && pedantic && warn_vla != 0)
3866 pedwarn (OPT_Wvla, "ISO C90 forbids array %qs whose size "
3867 "can%'t be evaluated",
3870 pedwarn (OPT_Wvla, "ISO C90 forbids array whose size "
3871 "can%'t be evaluated");
3876 pedwarn (OPT_Wvla, "ISO C90 forbids variable length array %qs",
3879 pedwarn (OPT_Wvla, "ISO C90 forbids variable length array");
3882 else if (warn_vla > 0)
3888 "the size of array %qs can"
3889 "%'t be evaluated", name);
3892 "the size of array can %'t be evaluated");
3898 "variable length array %qs is used",
3902 "variable length array is used");
3907 /* Given declspecs and a declarator,
3908 determine the name and type of the object declared
3909 and construct a ..._DECL node for it.
3910 (In one case we can return a ..._TYPE node instead.
3911 For invalid input we sometimes return 0.)
3913 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3915 DECL_CONTEXT says which syntactic context this declaration is in:
3916 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3917 FUNCDEF for a function definition. Like NORMAL but a few different
3918 error messages in each case. Return value may be zero meaning
3919 this definition is too screwy to try to parse.
3920 PARM for a parameter declaration (either within a function prototype
3921 or before a function body). Make a PARM_DECL, or return void_type_node.
3922 TYPENAME if for a typename (in a cast or sizeof).
3923 Don't make a DECL node; just return the ..._TYPE node.
3924 FIELD for a struct or union field; make a FIELD_DECL.
3925 INITIALIZED is true if the decl has an initializer.
3926 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3927 representing the width of the bit-field.
3928 DECL_ATTRS points to the list of attributes that should be added to this
3929 decl. Any nested attributes that belong on the decl itself will be
3931 DEPRECATED_STATE is a deprecated_states value indicating whether
3932 deprecation warnings should be suppressed.
3934 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3935 It may also be so in the PARM case, for a prototype where the
3936 argument type is specified but not the name.
3938 This function is where the complicated C meanings of `static'
3939 and `extern' are interpreted. */
3942 grokdeclarator (const struct c_declarator *declarator,
3943 struct c_declspecs *declspecs,
3944 enum decl_context decl_context, bool initialized, tree *width,
3945 tree *decl_attrs, enum deprecated_states deprecated_state)
3947 tree type = declspecs->type;
3948 bool threadp = declspecs->thread_p;
3949 enum c_storage_class storage_class = declspecs->storage_class;
3953 int type_quals = TYPE_UNQUALIFIED;
3954 const char *name, *orig_name;
3955 bool funcdef_flag = false;
3956 bool funcdef_syntax = false;
3957 int size_varies = 0;
3958 tree decl_attr = declspecs->decl_attr;
3959 int array_ptr_quals = TYPE_UNQUALIFIED;
3960 tree array_ptr_attrs = NULL_TREE;
3961 int array_parm_static = 0;
3962 bool array_parm_vla_unspec_p = false;
3963 tree returned_attrs = NULL_TREE;
3964 bool bitfield = width != NULL;
3966 struct c_arg_info *arg_info = 0;
3968 if (decl_context == FUNCDEF)
3969 funcdef_flag = true, decl_context = NORMAL;
3971 /* Look inside a declarator for the name being declared
3972 and get it as a string, for an error message. */
3974 const struct c_declarator *decl = declarator;
3983 funcdef_syntax = (decl->kind == cdk_function);
3984 decl = decl->declarator;
3988 decl = decl->declarator;
3993 name = IDENTIFIER_POINTER (decl->u.id);
4005 /* A function definition's declarator must have the form of
4006 a function declarator. */
4008 if (funcdef_flag && !funcdef_syntax)
4011 /* If this looks like a function definition, make it one,
4012 even if it occurs where parms are expected.
4013 Then store_parm_decls will reject it and not use it as a parm. */
4014 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4015 decl_context = PARM;
4017 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4018 warn_deprecated_use (declspecs->type);
4020 if ((decl_context == NORMAL || decl_context == FIELD)
4021 && current_scope == file_scope
4022 && variably_modified_type_p (type, NULL_TREE))
4024 error ("variably modified %qs at file scope", name);
4025 type = integer_type_node;
4028 size_varies = C_TYPE_VARIABLE_SIZE (type);
4030 /* Diagnose defaulting to "int". */
4032 if (declspecs->default_int_p && !in_system_header)
4034 /* Issue a warning if this is an ISO C 99 program or if
4035 -Wreturn-type and this is a function, or if -Wimplicit;
4036 prefer the former warning since it is more explicit. */
4037 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4039 warn_about_return_type = 1;
4041 pedwarn_c99 (flag_isoc99 ? 0 : OPT_Wimplicit_int,
4042 "type defaults to %<int%> in declaration of %qs", name);
4045 /* Adjust the type if a bit-field is being declared,
4046 -funsigned-bitfields applied and the type is not explicitly
4048 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4049 && TREE_CODE (type) == INTEGER_TYPE)
4050 type = unsigned_type_for (type);
4052 /* Figure out the type qualifiers for the declaration. There are
4053 two ways a declaration can become qualified. One is something
4054 like `const int i' where the `const' is explicit. Another is
4055 something like `typedef const int CI; CI i' where the type of the
4056 declaration contains the `const'. A third possibility is that
4057 there is a type qualifier on the element type of a typedefed
4058 array type, in which case we should extract that qualifier so
4059 that c_apply_type_quals_to_decl receives the full list of
4060 qualifiers to work with (C90 is not entirely clear about whether
4061 duplicate qualifiers should be diagnosed in this case, but it
4062 seems most appropriate to do so). */
4063 element_type = strip_array_types (type);
4064 constp = declspecs->const_p + TYPE_READONLY (element_type);
4065 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4066 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4067 if (pedantic && !flag_isoc99)
4070 pedwarn (OPT_pedantic, "duplicate %<const%>");
4072 pedwarn (OPT_pedantic, "duplicate %<restrict%>");
4074 pedwarn (OPT_pedantic, "duplicate %<volatile%>");
4076 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4077 type = TYPE_MAIN_VARIANT (type);
4078 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4079 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4080 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4082 /* Warn about storage classes that are invalid for certain
4083 kinds of declarations (parameters, typenames, etc.). */
4087 || storage_class == csc_auto
4088 || storage_class == csc_register
4089 || storage_class == csc_typedef))
4091 if (storage_class == csc_auto)
4092 pedwarn ((current_scope == file_scope) ? 0 : OPT_pedantic,
4093 "function definition declared %<auto%>");
4094 if (storage_class == csc_register)
4095 error ("function definition declared %<register%>");
4096 if (storage_class == csc_typedef)
4097 error ("function definition declared %<typedef%>");
4099 error ("function definition declared %<__thread%>");
4101 if (storage_class == csc_auto
4102 || storage_class == csc_register
4103 || storage_class == csc_typedef)
4104 storage_class = csc_none;
4106 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4108 if (decl_context == PARM && storage_class == csc_register)
4112 switch (decl_context)
4115 error ("storage class specified for structure field %qs",
4119 error ("storage class specified for parameter %qs", name);
4122 error ("storage class specified for typename");
4125 storage_class = csc_none;
4129 else if (storage_class == csc_extern
4133 /* 'extern' with initialization is invalid if not at file scope. */
4134 if (current_scope == file_scope)
4136 /* It is fine to have 'extern const' when compiling at C
4137 and C++ intersection. */
4138 if (!(warn_cxx_compat && constp))
4139 warning (0, "%qs initialized and declared %<extern%>", name);
4142 error ("%qs has both %<extern%> and initializer", name);
4144 else if (current_scope == file_scope)
4146 if (storage_class == csc_auto)
4147 error ("file-scope declaration of %qs specifies %<auto%>", name);
4148 if (pedantic && storage_class == csc_register)
4149 pedwarn (OPT_pedantic, "file-scope declaration of %qs specifies %<register%>", name);
4153 if (storage_class == csc_extern && funcdef_flag)
4154 error ("nested function %qs declared %<extern%>", name);
4155 else if (threadp && storage_class == csc_none)
4157 error ("function-scope %qs implicitly auto and declared "
4164 /* Now figure out the structure of the declarator proper.
4165 Descend through it, creating more complex types, until we reach
4166 the declared identifier (or NULL_TREE, in an absolute declarator).
4167 At each stage we maintain an unqualified version of the type
4168 together with any qualifiers that should be applied to it with
4169 c_build_qualified_type; this way, array types including
4170 multidimensional array types are first built up in unqualified
4171 form and then the qualified form is created with
4172 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4174 while (declarator && declarator->kind != cdk_id)
4176 if (type == error_mark_node)
4178 declarator = declarator->declarator;
4182 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4183 a cdk_pointer (for *...),
4184 a cdk_function (for ...(...)),
4185 a cdk_attrs (for nested attributes),
4186 or a cdk_id (for the name being declared
4187 or the place in an absolute declarator
4188 where the name was omitted).
4189 For the last case, we have just exited the loop.
4191 At this point, TYPE is the type of elements of an array,
4192 or for a function to return, or for a pointer to point to.
4193 After this sequence of ifs, TYPE is the type of the
4194 array or function or pointer, and DECLARATOR has had its
4195 outermost layer removed. */
4197 if (array_ptr_quals != TYPE_UNQUALIFIED
4198 || array_ptr_attrs != NULL_TREE
4199 || array_parm_static)
4201 /* Only the innermost declarator (making a parameter be of
4202 array type which is converted to pointer type)
4203 may have static or type qualifiers. */
4204 error ("static or type qualifiers in non-parameter array declarator");
4205 array_ptr_quals = TYPE_UNQUALIFIED;
4206 array_ptr_attrs = NULL_TREE;
4207 array_parm_static = 0;
4210 switch (declarator->kind)
4214 /* A declarator with embedded attributes. */
4215 tree attrs = declarator->u.attrs;
4216 const struct c_declarator *inner_decl;
4218 declarator = declarator->declarator;
4219 inner_decl = declarator;
4220 while (inner_decl->kind == cdk_attrs)
4221 inner_decl = inner_decl->declarator;
4222 if (inner_decl->kind == cdk_id)
4223 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4224 else if (inner_decl->kind == cdk_function)
4225 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4226 else if (inner_decl->kind == cdk_array)
4227 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4228 returned_attrs = decl_attributes (&type,
4229 chainon (returned_attrs, attrs),
4235 tree itype = NULL_TREE;
4236 tree size = declarator->u.array.dimen;
4237 /* The index is a signed object `sizetype' bits wide. */
4238 tree index_type = c_common_signed_type (sizetype);
4240 array_ptr_quals = declarator->u.array.quals;
4241 array_ptr_attrs = declarator->u.array.attrs;
4242 array_parm_static = declarator->u.array.static_p;
4243 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4245 declarator = declarator->declarator;
4247 /* Check for some types that there cannot be arrays of. */
4249 if (VOID_TYPE_P (type))
4251 error ("declaration of %qs as array of voids", name);
4252 type = error_mark_node;
4255 if (TREE_CODE (type) == FUNCTION_TYPE)
4257 error ("declaration of %qs as array of functions", name);
4258 type = error_mark_node;
4261 if (pedantic && !in_system_header && flexible_array_type_p (type))
4262 pedwarn (OPT_pedantic, "invalid use of structure with flexible array member");
4264 if (size == error_mark_node)
4265 type = error_mark_node;
4267 if (type == error_mark_node)
4270 /* If size was specified, set ITYPE to a range-type for
4271 that size. Otherwise, ITYPE remains null. finish_decl
4272 may figure it out from an initial value. */
4276 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4278 STRIP_TYPE_NOPS (size);
4280 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4282 error ("size of array %qs has non-integer type", name);
4283 size = integer_one_node;
4286 if (pedantic && integer_zerop (size))
4287 pedwarn (OPT_pedantic, "ISO C forbids zero-size array %qs", name);
4289 if (TREE_CODE (size) == INTEGER_CST)
4291 constant_expression_warning (size);
4292 if (tree_int_cst_sgn (size) < 0)
4294 error ("size of array %qs is negative", name);
4295 size = integer_one_node;
4298 else if ((decl_context == NORMAL || decl_context == FIELD)
4299 && current_scope == file_scope)
4301 error ("variably modified %qs at file scope", name);
4302 size = integer_one_node;
4306 /* Make sure the array size remains visibly
4307 nonconstant even if it is (eg) a const variable
4308 with known value. */
4310 warn_variable_length_array (orig_name, size);
4313 if (integer_zerop (size))
4315 /* A zero-length array cannot be represented with
4316 an unsigned index type, which is what we'll
4317 get with build_index_type. Create an
4318 open-ended range instead. */
4319 itype = build_range_type (sizetype, size, NULL_TREE);
4323 /* Arrange for the SAVE_EXPR on the inside of the
4324 MINUS_EXPR, which allows the -1 to get folded
4325 with the +1 that happens when building TYPE_SIZE. */
4327 size = variable_size (size);
4329 /* Compute the maximum valid index, that is, size
4330 - 1. Do the calculation in index_type, so that
4331 if it is a variable the computations will be
4332 done in the proper mode. */
4333 itype = fold_build2 (MINUS_EXPR, index_type,
4334 convert (index_type, size),
4335 convert (index_type,
4338 /* If that overflowed, the array is too big. ???
4339 While a size of INT_MAX+1 technically shouldn't
4340 cause an overflow (because we subtract 1), the
4341 overflow is recorded during the conversion to
4342 index_type, before the subtraction. Handling
4343 this case seems like an unnecessary
4345 if (TREE_CODE (itype) == INTEGER_CST
4346 && TREE_OVERFLOW (itype))
4348 error ("size of array %qs is too large", name);
4349 type = error_mark_node;
4353 itype = build_index_type (itype);
4356 else if (decl_context == FIELD)
4358 if (pedantic && !flag_isoc99 && !in_system_header)
4359 pedwarn (OPT_pedantic, "ISO C90 does not support flexible array members");
4361 /* ISO C99 Flexible array members are effectively
4362 identical to GCC's zero-length array extension. */
4363 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4365 else if (decl_context == PARM)
4367 if (array_parm_vla_unspec_p)
4372 error ("%<[*]%> not allowed in other than a declaration");
4375 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4379 else if (decl_context == TYPENAME)
4381 if (array_parm_vla_unspec_p)
4383 /* The error is printed elsewhere. We use this to
4384 avoid messing up with incomplete array types of
4385 the same type, that would otherwise be modified
4387 itype = build_range_type (sizetype, size_zero_node,
4392 /* Complain about arrays of incomplete types. */
4393 if (!COMPLETE_TYPE_P (type))
4395 error ("array type has incomplete element type");
4396 type = error_mark_node;
4399 /* When itype is NULL, a shared incomplete array type is
4400 returned for all array of a given type. Elsewhere we
4401 make sure we don't complete that type before copying
4402 it, but here we want to make sure we don't ever
4403 modify the shared type, so we gcc_assert (itype)
4405 type = build_array_type (type, itype);
4407 if (type != error_mark_node)
4411 /* It is ok to modify type here even if itype is
4412 NULL: if size_varies, we're in a
4413 multi-dimensional array and the inner type has
4414 variable size, so the enclosing shared array type
4416 if (size && TREE_CODE (size) == INTEGER_CST)
4418 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4419 C_TYPE_VARIABLE_SIZE (type) = 1;
4422 /* The GCC extension for zero-length arrays differs from
4423 ISO flexible array members in that sizeof yields
4425 if (size && integer_zerop (size))
4428 TYPE_SIZE (type) = bitsize_zero_node;
4429 TYPE_SIZE_UNIT (type) = size_zero_node;
4431 if (array_parm_vla_unspec_p)
4434 /* The type is complete. C99 6.7.5.2p4 */
4435 TYPE_SIZE (type) = bitsize_zero_node;
4436 TYPE_SIZE_UNIT (type) = size_zero_node;
4440 if (decl_context != PARM
4441 && (array_ptr_quals != TYPE_UNQUALIFIED
4442 || array_ptr_attrs != NULL_TREE
4443 || array_parm_static))
4445 error ("static or type qualifiers in non-parameter array declarator");
4446 array_ptr_quals = TYPE_UNQUALIFIED;
4447 array_ptr_attrs = NULL_TREE;
4448 array_parm_static = 0;
4454 /* Say it's a definition only for the declarator closest
4455 to the identifier, apart possibly from some
4457 bool really_funcdef = false;
4461 const struct c_declarator *t = declarator->declarator;
4462 while (t->kind == cdk_attrs)
4464 really_funcdef = (t->kind == cdk_id);
4467 /* Declaring a function type. Make sure we have a valid
4468 type for the function to return. */
4469 if (type == error_mark_node)
4474 /* Warn about some types functions can't return. */
4475 if (TREE_CODE (type) == FUNCTION_TYPE)
4477 error ("%qs declared as function returning a function", name);
4478 type = integer_type_node;
4480 if (TREE_CODE (type) == ARRAY_TYPE)
4482 error ("%qs declared as function returning an array", name);
4483 type = integer_type_node;
4486 /* Construct the function type and go to the next
4487 inner layer of declarator. */
4488 arg_info = declarator->u.arg_info;
4489 arg_types = grokparms (arg_info, really_funcdef);
4491 put_pending_sizes (arg_info->pending_sizes);
4493 /* Type qualifiers before the return type of the function
4494 qualify the return type, not the function type. */
4497 /* Type qualifiers on a function return type are
4498 normally permitted by the standard but have no
4499 effect, so give a warning at -Wreturn-type.
4500 Qualifiers on a void return type are banned on
4501 function definitions in ISO C; GCC used to used
4502 them for noreturn functions. */
4503 if (VOID_TYPE_P (type) && really_funcdef)
4504 pedwarn (0, "function definition has qualified void return type");
4506 warning (OPT_Wignored_qualifiers,
4507 "type qualifiers ignored on function return type");
4509 type = c_build_qualified_type (type, type_quals);
4511 type_quals = TYPE_UNQUALIFIED;
4513 type = build_function_type (type, arg_types);
4514 declarator = declarator->declarator;
4516 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4517 the formal parameter list of this FUNCTION_TYPE to point to
4518 the FUNCTION_TYPE node itself. */
4522 for (link = arg_info->tags;
4524 link = TREE_CHAIN (link))
4525 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4531 /* Merge any constancy or volatility into the target type
4534 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4536 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4538 type = c_build_qualified_type (type, type_quals);
4541 /* When the pointed-to type involves components of variable size,
4542 care must be taken to ensure that the size evaluation code is
4543 emitted early enough to dominate all the possible later uses
4544 and late enough for the variables on which it depends to have
4547 This is expected to happen automatically when the pointed-to
4548 type has a name/declaration of it's own, but special attention
4549 is required if the type is anonymous.
4551 We handle the NORMAL and FIELD contexts here by attaching an
4552 artificial TYPE_DECL to such pointed-to type. This forces the
4553 sizes evaluation at a safe point and ensures it is not deferred
4554 until e.g. within a deeper conditional context.
4556 We expect nothing to be needed here for PARM or TYPENAME.
4557 Pushing a TYPE_DECL at this point for TYPENAME would actually
4558 be incorrect, as we might be in the middle of an expression
4559 with side effects on the pointed-to type size "arguments" prior
4560 to the pointer declaration point and the fake TYPE_DECL in the
4561 enclosing context would force the size evaluation prior to the
4564 if (!TYPE_NAME (type)
4565 && (decl_context == NORMAL || decl_context == FIELD)
4566 && variably_modified_type_p (type, NULL_TREE))
4568 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4569 DECL_ARTIFICIAL (decl) = 1;
4571 finish_decl (decl, NULL_TREE, NULL_TREE);
4572 TYPE_NAME (type) = decl;
4575 type = build_pointer_type (type);
4577 /* Process type qualifiers (such as const or volatile)
4578 that were given inside the `*'. */
4579 type_quals = declarator->u.pointer_quals;
4581 declarator = declarator->declarator;
4588 *decl_attrs = chainon (returned_attrs, *decl_attrs);
4590 /* Now TYPE has the actual type, apart from any qualifiers in
4593 /* Check the type and width of a bit-field. */
4595 check_bitfield_type_and_width (&type, width, orig_name);
4597 /* Did array size calculations overflow? */
4599 if (TREE_CODE (type) == ARRAY_TYPE
4600 && COMPLETE_TYPE_P (type)
4601 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4602 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4604 error ("size of array %qs is too large", name);
4605 /* If we proceed with the array type as it is, we'll eventually
4606 crash in tree_low_cst(). */
4607 type = error_mark_node;
4610 /* If this is declaring a typedef name, return a TYPE_DECL. */
4612 if (storage_class == csc_typedef)
4615 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4617 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4619 type = c_build_qualified_type (type, type_quals);
4620 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4621 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4622 if (declspecs->explicit_signed_p)
4623 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4624 if (declspecs->inline_p)
4625 pedwarn (0, "typedef %q+D declared %<inline%>", decl);
4629 /* If this is a type name (such as, in a cast or sizeof),
4630 compute the type and return it now. */
4632 if (decl_context == TYPENAME)
4634 /* Note that the grammar rejects storage classes in typenames
4636 gcc_assert (storage_class == csc_none && !threadp
4637 && !declspecs->inline_p);
4638 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4640 pedwarn (OPT_pedantic, "ISO C forbids const or volatile function types");
4642 type = c_build_qualified_type (type, type_quals);
4646 if (pedantic && decl_context == FIELD
4647 && variably_modified_type_p (type, NULL_TREE))
4650 pedwarn (OPT_pedantic,
4651 "a member of a structure or union cannot have a variably modified type");
4654 /* Aside from typedefs and type names (handle above),
4655 `void' at top level (not within pointer)
4656 is allowed only in public variables.
4657 We don't complain about parms either, but that is because
4658 a better error message can be made later. */
4660 if (VOID_TYPE_P (type) && decl_context != PARM
4661 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4662 && (storage_class == csc_extern
4663 || (current_scope == file_scope
4664 && !(storage_class == csc_static
4665 || storage_class == csc_register)))))
4667 error ("variable or field %qs declared void", name);
4668 type = integer_type_node;
4671 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4672 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4677 if (decl_context == PARM)
4681 /* A parameter declared as an array of T is really a pointer to T.
4682 One declared as a function is really a pointer to a function. */
4684 if (TREE_CODE (type) == ARRAY_TYPE)
4686 /* Transfer const-ness of array into that of type pointed to. */
4687 type = TREE_TYPE (type);
4689 type = c_build_qualified_type (type, type_quals);
4690 type = build_pointer_type (type);
4691 type_quals = array_ptr_quals;
4693 type = c_build_qualified_type (type, type_quals);
4695 /* We don't yet implement attributes in this context. */
4696 if (array_ptr_attrs != NULL_TREE)
4697 warning (OPT_Wattributes,
4698 "attributes in parameter array declarator ignored");
4702 else if (TREE_CODE (type) == FUNCTION_TYPE)
4705 pedwarn (OPT_pedantic, "ISO C forbids qualified function types");
4707 type = c_build_qualified_type (type, type_quals);
4708 type = build_pointer_type (type);
4709 type_quals = TYPE_UNQUALIFIED;
4711 else if (type_quals)
4712 type = c_build_qualified_type (type, type_quals);
4714 decl = build_decl (PARM_DECL, declarator->u.id, type);
4715 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4717 C_DECL_VARIABLE_SIZE (decl) = 1;
4719 /* Compute the type actually passed in the parmlist,
4720 for the case where there is no prototype.
4721 (For example, shorts and chars are passed as ints.)
4722 When there is a prototype, this is overridden later. */
4724 if (type == error_mark_node)
4725 promoted_type = type;
4727 promoted_type = c_type_promotes_to (type);
4729 DECL_ARG_TYPE (decl) = promoted_type;
4730 if (declspecs->inline_p)
4731 pedwarn (0, "parameter %q+D declared %<inline%>", decl);
4733 else if (decl_context == FIELD)
4735 /* Note that the grammar rejects storage classes in typenames
4737 gcc_assert (storage_class == csc_none && !threadp
4738 && !declspecs->inline_p);
4740 /* Structure field. It may not be a function. */
4742 if (TREE_CODE (type) == FUNCTION_TYPE)
4744 error ("field %qs declared as a function", name);
4745 type = build_pointer_type (type);
4747 else if (TREE_CODE (type) != ERROR_MARK
4748 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4750 error ("field %qs has incomplete type", name);
4751 type = error_mark_node;
4753 type = c_build_qualified_type (type, type_quals);
4754 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4755 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4756 DECL_NONADDRESSABLE_P (decl) = bitfield;
4757 if (bitfield && !declarator->u.id)
4758 TREE_NO_WARNING (decl) = 1;
4761 C_DECL_VARIABLE_SIZE (decl) = 1;
4763 else if (TREE_CODE (type) == FUNCTION_TYPE)
4765 if (storage_class == csc_register || threadp)
4767 error ("invalid storage class for function %qs", name);
4769 else if (current_scope != file_scope)
4771 /* Function declaration not at file scope. Storage
4772 classes other than `extern' are not allowed, C99
4773 6.7.1p5, and `extern' makes no difference. However,
4774 GCC allows 'auto', perhaps with 'inline', to support
4775 nested functions. */
4776 if (storage_class == csc_auto)
4777 pedwarn (OPT_pedantic, "invalid storage class for function %qs", name);
4778 else if (storage_class == csc_static)
4780 error ("invalid storage class for function %qs", name);
4782 storage_class = declspecs->storage_class = csc_none;
4788 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4789 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4790 decl = build_decl_attribute_variant (decl, decl_attr);
4792 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4793 pedwarn (OPT_pedantic,
4794 "ISO C forbids qualified function types");
4796 /* GNU C interprets a volatile-qualified function type to indicate
4797 that the function does not return. */
4798 if ((type_quals & TYPE_QUAL_VOLATILE)
4799 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4800 warning (0, "%<noreturn%> function returns non-void value");
4802 /* Every function declaration is an external reference
4803 (DECL_EXTERNAL) except for those which are not at file
4804 scope and are explicitly declared "auto". This is
4805 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4806 GCC to signify a forward declaration of a nested function. */
4807 if (storage_class == csc_auto && current_scope != file_scope)
4808 DECL_EXTERNAL (decl) = 0;
4809 /* In C99, a function which is declared 'inline' with 'extern'
4810 is not an external reference (which is confusing). It
4811 means that the later definition of the function must be output
4812 in this file, C99 6.7.4p6. In GNU C89, a function declared
4813 'extern inline' is an external reference. */
4814 else if (declspecs->inline_p && storage_class != csc_static)
4815 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4816 == flag_gnu89_inline);
4818 DECL_EXTERNAL (decl) = !initialized;
4820 /* Record absence of global scope for `static' or `auto'. */
4822 = !(storage_class == csc_static || storage_class == csc_auto);
4824 /* For a function definition, record the argument information
4825 block where store_parm_decls will look for it. */
4827 current_function_arg_info = arg_info;
4829 if (declspecs->default_int_p)
4830 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4832 /* Record presence of `inline', if it is reasonable. */
4833 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4835 if (declspecs->inline_p)
4836 pedwarn (0, "cannot inline function %<main%>");
4838 else if (declspecs->inline_p)
4839 /* Record that the function is declared `inline'. */
4840 DECL_DECLARED_INLINE_P (decl) = 1;
4844 /* It's a variable. */
4845 /* An uninitialized decl with `extern' is a reference. */
4846 int extern_ref = !initialized && storage_class == csc_extern;
4848 type = c_build_qualified_type (type, type_quals);
4850 /* C99 6.2.2p7: It is invalid (compile-time undefined
4851 behavior) to create an 'extern' declaration for a
4852 variable if there is a global declaration that is
4853 'static' and the global declaration is not visible.
4854 (If the static declaration _is_ currently visible,
4855 the 'extern' declaration is taken to refer to that decl.) */
4856 if (extern_ref && current_scope != file_scope)
4858 tree global_decl = identifier_global_value (declarator->u.id);
4859 tree visible_decl = lookup_name (declarator->u.id);
4862 && global_decl != visible_decl
4863 && TREE_CODE (global_decl) == VAR_DECL
4864 && !TREE_PUBLIC (global_decl))
4865 error ("variable previously declared %<static%> redeclared "
4869 decl = build_decl (VAR_DECL, declarator->u.id, type);
4870 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4872 C_DECL_VARIABLE_SIZE (decl) = 1;
4874 if (declspecs->inline_p)
4875 pedwarn (0, "variable %q+D declared %<inline%>", decl);
4877 /* At file scope, an initialized extern declaration may follow
4878 a static declaration. In that case, DECL_EXTERNAL will be
4879 reset later in start_decl. */
4880 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4882 /* At file scope, the presence of a `static' or `register' storage
4883 class specifier, or the absence of all storage class specifiers
4884 makes this declaration a definition (perhaps tentative). Also,
4885 the absence of `static' makes it public. */
4886 if (current_scope == file_scope)
4888 TREE_PUBLIC (decl) = storage_class != csc_static;
4889 TREE_STATIC (decl) = !extern_ref;
4891 /* Not at file scope, only `static' makes a static definition. */
4894 TREE_STATIC (decl) = (storage_class == csc_static);
4895 TREE_PUBLIC (decl) = extern_ref;
4899 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4902 if (storage_class == csc_extern
4903 && variably_modified_type_p (type, NULL_TREE))
4906 error ("object with variably modified type must have no linkage");
4909 /* Record `register' declaration for warnings on &
4910 and in case doing stupid register allocation. */
4912 if (storage_class == csc_register)
4914 C_DECL_REGISTER (decl) = 1;
4915 DECL_REGISTER (decl) = 1;
4918 /* Record constancy and volatility. */
4919 c_apply_type_quals_to_decl (type_quals, decl);
4921 /* If a type has volatile components, it should be stored in memory.
4922 Otherwise, the fact that those components are volatile
4923 will be ignored, and would even crash the compiler.
4924 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4925 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4926 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4927 || TREE_CODE (decl) == RESULT_DECL))
4929 /* It is not an error for a structure with volatile fields to
4930 be declared register, but reset DECL_REGISTER since it
4931 cannot actually go in a register. */
4932 int was_reg = C_DECL_REGISTER (decl);
4933 C_DECL_REGISTER (decl) = 0;
4934 DECL_REGISTER (decl) = 0;
4935 c_mark_addressable (decl);
4936 C_DECL_REGISTER (decl) = was_reg;
4939 /* This is the earliest point at which we might know the assembler
4940 name of a variable. Thus, if it's known before this, die horribly. */
4941 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4947 /* Decode the parameter-list info for a function type or function definition.
4948 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4949 if there is an identifier list instead of a parameter decl list).
4950 These two functions are separate because when a function returns
4951 or receives functions then each is called multiple times but the order
4952 of calls is different. The last call to `grokparms' is always the one
4953 that contains the formal parameter names of a function definition.
4955 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4957 FUNCDEF_FLAG is true for a function definition, false for
4958 a mere declaration. A nonempty identifier-list gets an error message
4959 when FUNCDEF_FLAG is false. */
4962 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4964 tree arg_types = arg_info->types;
4966 if (funcdef_flag && arg_info->had_vla_unspec)
4968 /* A function definition isn't function prototype scope C99 6.2.1p4. */
4970 error ("%<[*]%> not allowed in other than function prototype scope");
4973 if (arg_types == 0 && !funcdef_flag && !in_system_header)
4974 warning (OPT_Wstrict_prototypes,
4975 "function declaration isn%'t a prototype");
4977 if (arg_types == error_mark_node)
4978 return 0; /* don't set TYPE_ARG_TYPES in this case */
4980 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4983 pedwarn (0, "parameter names (without types) in function declaration");
4985 arg_info->parms = arg_info->types;
4986 arg_info->types = 0;
4991 tree parm, type, typelt;
4992 unsigned int parmno;
4994 /* If there is a parameter of incomplete type in a definition,
4995 this is an error. In a declaration this is valid, and a
4996 struct or union type may be completed later, before any calls
4997 or definition of the function. In the case where the tag was
4998 first declared within the parameter list, a warning has
4999 already been given. If a parameter has void type, then
5000 however the function cannot be defined or called, so
5003 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5005 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5007 type = TREE_VALUE (typelt);
5008 if (type == error_mark_node)
5011 if (!COMPLETE_TYPE_P (type))
5015 if (DECL_NAME (parm))
5016 error ("parameter %u (%q+D) has incomplete type",
5019 error ("%Jparameter %u has incomplete type",
5022 TREE_VALUE (typelt) = error_mark_node;
5023 TREE_TYPE (parm) = error_mark_node;
5025 else if (VOID_TYPE_P (type))
5027 if (DECL_NAME (parm))
5028 warning (0, "parameter %u (%q+D) has void type",
5031 warning (0, "%Jparameter %u has void type",
5036 if (DECL_NAME (parm) && TREE_USED (parm))
5037 warn_if_shadowing (parm);
5043 /* Take apart the current scope and return a c_arg_info structure with
5044 info on a parameter list just parsed.
5046 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5048 ELLIPSIS being true means the argument list ended in '...' so don't
5049 append a sentinel (void_list_node) to the end of the type-list. */
5052 get_parm_info (bool ellipsis)
5054 struct c_binding *b = current_scope->bindings;
5055 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5062 static bool explained_incomplete_types = false;
5063 bool gave_void_only_once_err = false;
5065 arg_info->parms = 0;
5067 arg_info->types = 0;
5068 arg_info->others = 0;
5069 arg_info->pending_sizes = 0;
5070 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5072 /* The bindings in this scope must not get put into a block.
5073 We will take care of deleting the binding nodes. */
5074 current_scope->bindings = 0;
5076 /* This function is only called if there was *something* on the
5080 /* A parameter list consisting solely of 'void' indicates that the
5081 function takes no arguments. But if the 'void' is qualified
5082 (by 'const' or 'volatile'), or has a storage class specifier
5083 ('register'), then the behavior is undefined; issue an error.
5084 Typedefs for 'void' are OK (see DR#157). */
5085 if (b->prev == 0 /* one binding */
5086 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5087 && !DECL_NAME (b->decl) /* anonymous */
5088 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5090 if (TREE_THIS_VOLATILE (b->decl)
5091 || TREE_READONLY (b->decl)
5092 || C_DECL_REGISTER (b->decl))
5093 error ("%<void%> as only parameter may not be qualified");
5095 /* There cannot be an ellipsis. */
5097 error ("%<void%> must be the only parameter");
5099 arg_info->types = void_list_node;
5104 types = void_list_node;
5106 /* Break up the bindings list into parms, tags, types, and others;
5107 apply sanity checks; purge the name-to-decl bindings. */
5110 tree decl = b->decl;
5111 tree type = TREE_TYPE (decl);
5112 const char *keyword;
5114 switch (TREE_CODE (decl))
5119 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5120 I_SYMBOL_BINDING (b->id) = b->shadowed;
5123 /* Check for forward decls that never got their actual decl. */
5124 if (TREE_ASM_WRITTEN (decl))
5125 error ("parameter %q+D has just a forward declaration", decl);
5126 /* Check for (..., void, ...) and issue an error. */
5127 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5129 if (!gave_void_only_once_err)
5131 error ("%<void%> must be the only parameter");
5132 gave_void_only_once_err = true;
5137 /* Valid parameter, add it to the list. */
5138 TREE_CHAIN (decl) = parms;
5141 /* Since there is a prototype, args are passed in their
5142 declared types. The back end may override this later. */
5143 DECL_ARG_TYPE (decl) = type;
5144 types = tree_cons (0, type, types);
5148 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5149 case UNION_TYPE: keyword = "union"; goto tag;
5150 case RECORD_TYPE: keyword = "struct"; goto tag;
5152 /* Types may not have tag-names, in which case the type
5153 appears in the bindings list with b->id NULL. */
5156 gcc_assert (I_TAG_BINDING (b->id) == b);
5157 I_TAG_BINDING (b->id) = b->shadowed;
5160 /* Warn about any struct, union or enum tags defined in a
5161 parameter list. The scope of such types is limited to
5162 the parameter list, which is rarely if ever desirable
5163 (it's impossible to call such a function with type-
5164 correct arguments). An anonymous union parm type is
5165 meaningful as a GNU extension, so don't warn for that. */
5166 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5169 /* The %s will be one of 'struct', 'union', or 'enum'. */
5170 warning (0, "%<%s %E%> declared inside parameter list",
5173 /* The %s will be one of 'struct', 'union', or 'enum'. */
5174 warning (0, "anonymous %s declared inside parameter list",
5177 if (!explained_incomplete_types)
5179 warning (0, "its scope is only this definition or declaration,"
5180 " which is probably not what you want");
5181 explained_incomplete_types = true;
5185 tags = tree_cons (b->id, decl, tags);
5191 /* CONST_DECLs appear here when we have an embedded enum,
5192 and TYPE_DECLs appear here when we have an embedded struct
5193 or union. No warnings for this - we already warned about the
5194 type itself. FUNCTION_DECLs appear when there is an implicit
5195 function declaration in the parameter list. */
5197 TREE_CHAIN (decl) = others;
5202 /* error_mark_node appears here when we have an undeclared
5203 variable. Just throw it away. */
5206 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5207 I_SYMBOL_BINDING (b->id) = b->shadowed;
5211 /* Other things that might be encountered. */
5218 b = free_binding_and_advance (b);
5221 arg_info->parms = parms;
5222 arg_info->tags = tags;
5223 arg_info->types = types;
5224 arg_info->others = others;
5225 arg_info->pending_sizes = get_pending_sizes ();
5229 /* Get the struct, enum or union (CODE says which) with tag NAME.
5230 Define the tag as a forward-reference if it is not defined.
5231 Return a c_typespec structure for the type specifier. */
5234 parser_xref_tag (enum tree_code code, tree name)
5236 struct c_typespec ret;
5237 /* If a cross reference is requested, look up the type
5238 already defined for this tag and return it. */
5240 tree ref = lookup_tag (code, name, 0);
5241 /* If this is the right type of tag, return what we found.
5242 (This reference will be shadowed by shadow_tag later if appropriate.)
5243 If this is the wrong type of tag, do not return it. If it was the
5244 wrong type in the same scope, we will have had an error
5245 message already; if in a different scope and declaring
5246 a name, pending_xref_error will give an error message; but if in a
5247 different scope and not declaring a name, this tag should
5248 shadow the previous declaration of a different type of tag, and
5249 this would not work properly if we return the reference found.
5250 (For example, with "struct foo" in an outer scope, "union foo;"
5251 must shadow that tag with a new one of union type.) */
5252 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5253 if (ref && TREE_CODE (ref) == code)
5259 /* If no such tag is yet defined, create a forward-reference node
5260 and record it as the "definition".
5261 When a real declaration of this type is found,
5262 the forward-reference will be altered into a real type. */
5264 ref = make_node (code);
5265 if (code == ENUMERAL_TYPE)
5267 /* Give the type a default layout like unsigned int
5268 to avoid crashing if it does not get defined. */
5269 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5270 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5271 TYPE_USER_ALIGN (ref) = 0;
5272 TYPE_UNSIGNED (ref) = 1;
5273 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5274 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5275 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5278 pushtag (name, ref);
5284 /* Get the struct, enum or union (CODE says which) with tag NAME.
5285 Define the tag as a forward-reference if it is not defined.
5286 Return a tree for the type. */
5289 xref_tag (enum tree_code code, tree name)
5291 return parser_xref_tag (code, name).spec;
5294 /* Make sure that the tag NAME is defined *in the current scope*
5295 at least as a forward reference.
5296 CODE says which kind of tag NAME ought to be. */
5299 start_struct (enum tree_code code, tree name)
5301 /* If there is already a tag defined at this scope
5302 (as a forward reference), just return it. */
5307 ref = lookup_tag (code, name, 1);
5308 if (ref && TREE_CODE (ref) == code)
5310 if (TYPE_SIZE (ref))
5312 if (code == UNION_TYPE)
5313 error ("redefinition of %<union %E%>", name);
5315 error ("redefinition of %<struct %E%>", name);
5317 else if (C_TYPE_BEING_DEFINED (ref))
5319 if (code == UNION_TYPE)
5320 error ("nested redefinition of %<union %E%>", name);
5322 error ("nested redefinition of %<struct %E%>", name);
5323 /* Don't create structures that contain themselves. */
5328 /* Otherwise create a forward-reference just so the tag is in scope. */
5330 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5332 ref = make_node (code);
5333 pushtag (name, ref);
5336 C_TYPE_BEING_DEFINED (ref) = 1;
5337 TYPE_PACKED (ref) = flag_pack_struct;
5341 /* Process the specs, declarator and width (NULL if omitted)
5342 of a structure component, returning a FIELD_DECL node.
5343 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5344 DECL_ATTRS is as for grokdeclarator.
5346 This is done during the parsing of the struct declaration.
5347 The FIELD_DECL nodes are chained together and the lot of them
5348 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5351 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5352 tree width, tree *decl_attrs)
5356 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5357 && width == NULL_TREE)
5359 /* This is an unnamed decl.
5361 If we have something of the form "union { list } ;" then this
5362 is the anonymous union extension. Similarly for struct.
5364 If this is something of the form "struct foo;", then
5365 If MS extensions are enabled, this is handled as an
5367 Otherwise this is a forward declaration of a structure tag.
5369 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5370 If MS extensions are enabled and foo names a structure, then
5371 again this is an anonymous struct.
5372 Otherwise this is an error.
5374 Oh what a horrid tangled web we weave. I wonder if MS consciously
5375 took this from Plan 9 or if it was an accident of implementation
5376 that took root before someone noticed the bug... */
5378 tree type = declspecs->type;
5379 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5380 || TREE_CODE (type) == UNION_TYPE);
5384 && (flag_ms_extensions || !declspecs->typedef_p))
5386 if (flag_ms_extensions)
5390 else if (TYPE_NAME (type) == NULL)
5397 pedwarn (0, "declaration does not declare anything");
5400 pedwarn (OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
5403 value = grokdeclarator (declarator, declspecs, FIELD, false,
5404 width ? &width : NULL, decl_attrs,
5407 finish_decl (value, NULL_TREE, NULL_TREE);
5408 DECL_INITIAL (value) = width;
5413 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5414 the list such that this does not present a problem later. */
5417 detect_field_duplicates (tree fieldlist)
5422 /* First, see if there are more than "a few" fields.
5423 This is trivially true if there are zero or one fields. */
5426 x = TREE_CHAIN (fieldlist);
5432 } while (timeout > 0 && x);
5434 /* If there were "few" fields, avoid the overhead of allocating
5435 a hash table. Instead just do the nested traversal thing. */
5438 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5441 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5442 if (DECL_NAME (y) == DECL_NAME (x))
5444 error ("duplicate member %q+D", x);
5445 DECL_NAME (x) = NULL_TREE;
5451 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5454 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5455 if ((y = DECL_NAME (x)) != 0)
5457 slot = htab_find_slot (htab, y, INSERT);
5460 error ("duplicate member %q+D", x);
5461 DECL_NAME (x) = NULL_TREE;
5470 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5471 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5472 ATTRIBUTES are attributes to be applied to the structure. */
5475 finish_struct (tree t, tree fieldlist, tree attributes)
5478 bool toplevel = file_scope == current_scope;
5479 int saw_named_field;
5481 /* If this type was previously laid out as a forward reference,
5482 make sure we lay it out again. */
5486 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5490 for (x = fieldlist; x; x = TREE_CHAIN (x))
5491 if (DECL_NAME (x) != 0)
5496 if (TREE_CODE (t) == UNION_TYPE)
5499 pedwarn (OPT_pedantic, "union has no named members");
5501 pedwarn (OPT_pedantic, "union has no members");
5506 pedwarn (OPT_pedantic, "struct has no named members");
5508 pedwarn (OPT_pedantic, "struct has no members");
5513 /* Install struct as DECL_CONTEXT of each field decl.
5514 Also process specified field sizes, found in the DECL_INITIAL,
5515 storing 0 there after the type has been changed to precision equal
5516 to its width, rather than the precision of the specified standard
5517 type. (Correct layout requires the original type to have been preserved
5520 saw_named_field = 0;
5521 for (x = fieldlist; x; x = TREE_CHAIN (x))
5523 if (TREE_TYPE (x) == error_mark_node)
5526 DECL_CONTEXT (x) = t;
5528 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5529 DECL_PACKED (x) = 1;
5531 /* If any field is const, the structure type is pseudo-const. */
5532 if (TREE_READONLY (x))
5533 C_TYPE_FIELDS_READONLY (t) = 1;
5536 /* A field that is pseudo-const makes the structure likewise. */
5537 tree t1 = TREE_TYPE (x);
5538 while (TREE_CODE (t1) == ARRAY_TYPE)
5539 t1 = TREE_TYPE (t1);
5540 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5541 && C_TYPE_FIELDS_READONLY (t1))
5542 C_TYPE_FIELDS_READONLY (t) = 1;
5545 /* Any field that is volatile means variables of this type must be
5546 treated in some ways as volatile. */
5547 if (TREE_THIS_VOLATILE (x))
5548 C_TYPE_FIELDS_VOLATILE (t) = 1;
5550 /* Any field of nominal variable size implies structure is too. */
5551 if (C_DECL_VARIABLE_SIZE (x))
5552 C_TYPE_VARIABLE_SIZE (t) = 1;
5554 if (DECL_INITIAL (x))
5556 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5557 DECL_SIZE (x) = bitsize_int (width);
5558 DECL_BIT_FIELD (x) = 1;
5559 SET_DECL_C_BIT_FIELD (x);
5562 /* Detect flexible array member in an invalid context. */
5563 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5564 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5565 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5566 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5568 if (TREE_CODE (t) == UNION_TYPE)
5570 error ("%Jflexible array member in union", x);
5571 TREE_TYPE (x) = error_mark_node;
5573 else if (TREE_CHAIN (x) != NULL_TREE)
5575 error ("%Jflexible array member not at end of struct", x);
5576 TREE_TYPE (x) = error_mark_node;
5578 else if (!saw_named_field)
5580 error ("%Jflexible array member in otherwise empty struct", x);
5581 TREE_TYPE (x) = error_mark_node;
5585 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5586 && flexible_array_type_p (TREE_TYPE (x)))
5587 pedwarn (OPT_pedantic,
5588 "%Jinvalid use of structure with flexible array member", x);
5591 saw_named_field = 1;
5594 detect_field_duplicates (fieldlist);
5596 /* Now we have the nearly final fieldlist. Record it,
5597 then lay out the structure or union (including the fields). */
5599 TYPE_FIELDS (t) = fieldlist;
5603 /* Give bit-fields their proper types. */
5605 tree *fieldlistp = &fieldlist;
5607 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5608 && TREE_TYPE (*fieldlistp) != error_mark_node)
5610 unsigned HOST_WIDE_INT width
5611 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5612 tree type = TREE_TYPE (*fieldlistp);
5613 if (width != TYPE_PRECISION (type))
5615 TREE_TYPE (*fieldlistp)
5616 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5617 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5619 DECL_INITIAL (*fieldlistp) = 0;
5622 fieldlistp = &TREE_CHAIN (*fieldlistp);
5625 /* Now we have the truly final field list.
5626 Store it in this type and in the variants. */
5628 TYPE_FIELDS (t) = fieldlist;
5630 /* If there are lots of fields, sort so we can look through them fast.
5631 We arbitrarily consider 16 or more elts to be "a lot". */
5636 for (x = fieldlist; x; x = TREE_CHAIN (x))
5638 if (len > 15 || DECL_NAME (x) == NULL)
5646 struct lang_type *space;
5647 struct sorted_fields_type *space2;
5649 len += list_length (x);
5651 /* Use the same allocation policy here that make_node uses, to
5652 ensure that this lives as long as the rest of the struct decl.
5653 All decls in an inline function need to be saved. */
5655 space = GGC_CNEW (struct lang_type);
5656 space2 = GGC_NEWVAR (struct sorted_fields_type,
5657 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5661 field_array = &space2->elts[0];
5662 for (x = fieldlist; x; x = TREE_CHAIN (x))
5664 field_array[len++] = x;
5666 /* If there is anonymous struct or union, break out of the loop. */
5667 if (DECL_NAME (x) == NULL)
5670 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5673 TYPE_LANG_SPECIFIC (t) = space;
5674 TYPE_LANG_SPECIFIC (t)->s->len = len;
5675 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5676 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5681 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5683 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5684 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5685 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5686 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5687 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5690 /* If this was supposed to be a transparent union, but we can't
5691 make it one, warn and turn off the flag. */
5692 if (TREE_CODE (t) == UNION_TYPE
5693 && TYPE_TRANSPARENT_UNION (t)
5694 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5696 TYPE_TRANSPARENT_UNION (t) = 0;
5697 warning (0, "union cannot be made transparent");
5700 /* If this structure or union completes the type of any previous
5701 variable declaration, lay it out and output its rtl. */
5702 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5706 tree decl = TREE_VALUE (x);
5707 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5708 layout_array_type (TREE_TYPE (decl));
5709 if (TREE_CODE (decl) != TYPE_DECL)
5711 layout_decl (decl, 0);
5712 if (c_dialect_objc ())
5713 objc_check_decl (decl);
5714 rest_of_decl_compilation (decl, toplevel, 0);
5719 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5721 /* Finish debugging output for this type. */
5722 rest_of_type_compilation (t, toplevel);
5724 /* If we're inside a function proper, i.e. not file-scope and not still
5725 parsing parameters, then arrange for the size of a variable sized type
5727 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5728 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5733 /* Lay out the type T, and its element type, and so on. */
5736 layout_array_type (tree t)
5738 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5739 layout_array_type (TREE_TYPE (t));
5743 /* Begin compiling the definition of an enumeration type.
5744 NAME is its name (or null if anonymous).
5745 Returns the type object, as yet incomplete.
5746 Also records info about it so that build_enumerator
5747 may be used to declare the individual values as they are read. */
5750 start_enum (struct c_enum_contents *the_enum, tree name)
5754 /* If this is the real definition for a previous forward reference,
5755 fill in the contents in the same object that used to be the
5756 forward reference. */
5759 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5761 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5763 enumtype = make_node (ENUMERAL_TYPE);
5764 pushtag (name, enumtype);
5767 if (C_TYPE_BEING_DEFINED (enumtype))
5768 error ("nested redefinition of %<enum %E%>", name);
5770 C_TYPE_BEING_DEFINED (enumtype) = 1;
5772 if (TYPE_VALUES (enumtype) != 0)
5774 /* This enum is a named one that has been declared already. */
5775 error ("redeclaration of %<enum %E%>", name);
5777 /* Completely replace its old definition.
5778 The old enumerators remain defined, however. */
5779 TYPE_VALUES (enumtype) = 0;
5782 the_enum->enum_next_value = integer_zero_node;
5783 the_enum->enum_overflow = 0;
5785 if (flag_short_enums)
5786 TYPE_PACKED (enumtype) = 1;
5791 /* After processing and defining all the values of an enumeration type,
5792 install their decls in the enumeration type and finish it off.
5793 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5794 and ATTRIBUTES are the specified attributes.
5795 Returns ENUMTYPE. */
5798 finish_enum (tree enumtype, tree values, tree attributes)
5801 tree minnode = 0, maxnode = 0;
5802 int precision, unsign;
5803 bool toplevel = (file_scope == current_scope);
5804 struct lang_type *lt;
5806 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5808 /* Calculate the maximum value of any enumerator in this type. */
5810 if (values == error_mark_node)
5811 minnode = maxnode = integer_zero_node;
5814 minnode = maxnode = TREE_VALUE (values);
5815 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5817 tree value = TREE_VALUE (pair);
5818 if (tree_int_cst_lt (maxnode, value))
5820 if (tree_int_cst_lt (value, minnode))
5825 /* Construct the final type of this enumeration. It is the same
5826 as one of the integral types - the narrowest one that fits, except
5827 that normally we only go as narrow as int - and signed iff any of
5828 the values are negative. */
5829 unsign = (tree_int_cst_sgn (minnode) >= 0);
5830 precision = MAX (min_precision (minnode, unsign),
5831 min_precision (maxnode, unsign));
5833 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5835 tem = c_common_type_for_size (precision, unsign);
5838 warning (0, "enumeration values exceed range of largest integer");
5839 tem = long_long_integer_type_node;
5843 tem = unsign ? unsigned_type_node : integer_type_node;
5845 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5846 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5847 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5848 TYPE_SIZE (enumtype) = 0;
5850 /* If the precision of the type was specific with an attribute and it
5851 was too small, give an error. Otherwise, use it. */
5852 if (TYPE_PRECISION (enumtype))
5854 if (precision > TYPE_PRECISION (enumtype))
5855 error ("specified mode too small for enumeral values");
5858 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5860 layout_type (enumtype);
5862 if (values != error_mark_node)
5864 /* Change the type of the enumerators to be the enum type. We
5865 need to do this irrespective of the size of the enum, for
5866 proper type checking. Replace the DECL_INITIALs of the
5867 enumerators, and the value slots of the list, with copies
5868 that have the enum type; they cannot be modified in place
5869 because they may be shared (e.g. integer_zero_node) Finally,
5870 change the purpose slots to point to the names of the decls. */
5871 for (pair = values; pair; pair = TREE_CHAIN (pair))
5873 tree enu = TREE_PURPOSE (pair);
5874 tree ini = DECL_INITIAL (enu);
5876 TREE_TYPE (enu) = enumtype;
5878 /* The ISO C Standard mandates enumerators to have type int,
5879 even though the underlying type of an enum type is
5880 unspecified. Here we convert any enumerators that fit in
5881 an int to type int, to avoid promotions to unsigned types
5882 when comparing integers with enumerators that fit in the
5883 int range. When -pedantic is given, build_enumerator()
5884 would have already taken care of those that don't fit. */
5885 if (int_fits_type_p (ini, integer_type_node))
5886 tem = integer_type_node;
5889 ini = convert (tem, ini);
5891 DECL_INITIAL (enu) = ini;
5892 TREE_PURPOSE (pair) = DECL_NAME (enu);
5893 TREE_VALUE (pair) = ini;
5896 TYPE_VALUES (enumtype) = values;
5899 /* Record the min/max values so that we can warn about bit-field
5900 enumerations that are too small for the values. */
5901 lt = GGC_CNEW (struct lang_type);
5902 lt->enum_min = minnode;
5903 lt->enum_max = maxnode;
5904 TYPE_LANG_SPECIFIC (enumtype) = lt;
5906 /* Fix up all variant types of this enum type. */
5907 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5909 if (tem == enumtype)
5911 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5912 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5913 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5914 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5915 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5916 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5917 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5918 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5919 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5920 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5921 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5924 /* Finish debugging output for this type. */
5925 rest_of_type_compilation (enumtype, toplevel);
5930 /* Build and install a CONST_DECL for one value of the
5931 current enumeration type (one that was begun with start_enum).
5932 Return a tree-list containing the CONST_DECL and its value.
5933 Assignment of sequential values by default is handled here. */
5936 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value)
5940 /* Validate and default VALUE. */
5944 /* Don't issue more errors for error_mark_node (i.e. an
5945 undeclared identifier) - just ignore the value expression. */
5946 if (value == error_mark_node)
5948 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
5949 || TREE_CODE (value) != INTEGER_CST)
5951 error ("enumerator value for %qE is not an integer constant", name);
5956 value = default_conversion (value);
5957 constant_expression_warning (value);
5961 /* Default based on previous value. */
5962 /* It should no longer be possible to have NON_LVALUE_EXPR
5966 value = the_enum->enum_next_value;
5967 if (the_enum->enum_overflow)
5968 error ("overflow in enumeration values");
5971 if (pedantic && !int_fits_type_p (value, integer_type_node))
5973 pedwarn (OPT_pedantic, "ISO C restricts enumerator values to range of %<int%>");
5974 /* XXX This causes -pedantic to change the meaning of the program.
5975 Remove? -zw 2004-03-15 */
5976 value = convert (integer_type_node, value);
5979 /* Set basis for default for next value. */
5980 the_enum->enum_next_value = build_binary_op (PLUS_EXPR, value,
5981 integer_one_node, 0);
5982 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
5984 /* Now create a declaration for the enum value name. */
5986 type = TREE_TYPE (value);
5987 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5988 TYPE_PRECISION (integer_type_node)),
5989 (TYPE_PRECISION (type)
5990 >= TYPE_PRECISION (integer_type_node)
5991 && TYPE_UNSIGNED (type)));
5993 decl = build_decl (CONST_DECL, name, type);
5994 DECL_INITIAL (decl) = convert (type, value);
5997 return tree_cons (decl, value, NULL_TREE);
6001 /* Create the FUNCTION_DECL for a function definition.
6002 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6003 the declaration; they describe the function's name and the type it returns,
6004 but twisted together in a fashion that parallels the syntax of C.
6006 This function creates a binding context for the function body
6007 as well as setting up the FUNCTION_DECL in current_function_decl.
6009 Returns 1 on success. If the DECLARATOR is not suitable for a function
6010 (it defines a datum instead), we return 0, which tells
6011 yyparse to report a parse error. */
6014 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6017 tree decl1, old_decl;
6018 tree restype, resdecl;
6019 struct c_label_context_se *nstack_se;
6020 struct c_label_context_vm *nstack_vm;
6022 current_function_returns_value = 0; /* Assume, until we see it does. */
6023 current_function_returns_null = 0;
6024 current_function_returns_abnormally = 0;
6025 warn_about_return_type = 0;
6026 c_switch_stack = NULL;
6028 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6029 nstack_se->labels_def = NULL;
6030 nstack_se->labels_used = NULL;
6031 nstack_se->next = label_context_stack_se;
6032 label_context_stack_se = nstack_se;
6034 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6035 nstack_vm->labels_def = NULL;
6036 nstack_vm->labels_used = NULL;
6037 nstack_vm->scope = 0;
6038 nstack_vm->next = label_context_stack_vm;
6039 label_context_stack_vm = nstack_vm;
6041 /* Indicate no valid break/continue context by setting these variables
6042 to some non-null, non-label value. We'll notice and emit the proper
6043 error message in c_finish_bc_stmt. */
6044 c_break_label = c_cont_label = size_zero_node;
6046 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6047 &attributes, DEPRECATED_NORMAL);
6049 /* If the declarator is not suitable for a function definition,
6050 cause a syntax error. */
6053 label_context_stack_se = label_context_stack_se->next;
6054 label_context_stack_vm = label_context_stack_vm->next;
6058 decl_attributes (&decl1, attributes, 0);
6060 if (DECL_DECLARED_INLINE_P (decl1)
6061 && DECL_UNINLINABLE (decl1)
6062 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6063 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6066 /* Handle gnu_inline attribute. */
6067 if (declspecs->inline_p
6068 && !flag_gnu89_inline
6069 && TREE_CODE (decl1) == FUNCTION_DECL
6070 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
6071 || current_function_decl))
6073 if (declspecs->storage_class != csc_static)
6074 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6077 announce_function (decl1);
6079 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6081 error ("return type is an incomplete type");
6082 /* Make it return void instead. */
6084 = build_function_type (void_type_node,
6085 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6088 if (warn_about_return_type)
6089 pedwarn_c99 (flag_isoc99 ? 0
6090 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
6091 "return type defaults to %<int%>");
6093 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6094 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6095 DECL_INITIAL (decl1) = error_mark_node;
6097 /* If this definition isn't a prototype and we had a prototype declaration
6098 before, copy the arg type info from that prototype. */
6099 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6100 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6102 current_function_prototype_locus = UNKNOWN_LOCATION;
6103 current_function_prototype_built_in = false;
6104 current_function_prototype_arg_types = NULL_TREE;
6105 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6107 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6108 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6109 TREE_TYPE (TREE_TYPE (old_decl))))
6111 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6113 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6114 current_function_prototype_built_in
6115 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6116 current_function_prototype_arg_types
6117 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6119 if (TREE_PUBLIC (decl1))
6121 /* If there is an external prototype declaration of this
6122 function, record its location but do not copy information
6123 to this decl. This may be an invisible declaration
6124 (built-in or in a scope which has finished) or simply
6125 have more refined argument types than any declaration
6127 struct c_binding *b;
6128 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6129 if (B_IN_SCOPE (b, external_scope))
6133 tree ext_decl, ext_type;
6135 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6136 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6137 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6138 TREE_TYPE (ext_type)))
6140 current_function_prototype_locus
6141 = DECL_SOURCE_LOCATION (ext_decl);
6142 current_function_prototype_built_in
6143 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6144 current_function_prototype_arg_types
6145 = TYPE_ARG_TYPES (ext_type);
6151 /* Optionally warn of old-fashioned def with no previous prototype. */
6152 if (warn_strict_prototypes
6153 && old_decl != error_mark_node
6154 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6155 && C_DECL_ISNT_PROTOTYPE (old_decl))
6156 warning (OPT_Wstrict_prototypes,
6157 "function declaration isn%'t a prototype");
6158 /* Optionally warn of any global def with no previous prototype. */
6159 else if (warn_missing_prototypes
6160 && old_decl != error_mark_node
6161 && TREE_PUBLIC (decl1)
6162 && !MAIN_NAME_P (DECL_NAME (decl1))
6163 && C_DECL_ISNT_PROTOTYPE (old_decl))
6164 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6165 /* Optionally warn of any def with no previous prototype
6166 if the function has already been used. */
6167 else if (warn_missing_prototypes
6169 && old_decl != error_mark_node
6170 && TREE_USED (old_decl)
6171 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6172 warning (OPT_Wmissing_prototypes,
6173 "%q+D was used with no prototype before its definition", decl1);
6174 /* Optionally warn of any global def with no previous declaration. */
6175 else if (warn_missing_declarations
6176 && TREE_PUBLIC (decl1)
6178 && !MAIN_NAME_P (DECL_NAME (decl1)))
6179 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6181 /* Optionally warn of any def with no previous declaration
6182 if the function has already been used. */
6183 else if (warn_missing_declarations
6185 && old_decl != error_mark_node
6186 && TREE_USED (old_decl)
6187 && C_DECL_IMPLICIT (old_decl))
6188 warning (OPT_Wmissing_declarations,
6189 "%q+D was used with no declaration before its definition", decl1);
6191 /* This function exists in static storage.
6192 (This does not mean `static' in the C sense!) */
6193 TREE_STATIC (decl1) = 1;
6195 /* A nested function is not global. */
6196 if (current_function_decl != 0)
6197 TREE_PUBLIC (decl1) = 0;
6199 /* This is the earliest point at which we might know the assembler
6200 name of the function. Thus, if it's set before this, die horribly. */
6201 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6203 /* If #pragma weak was used, mark the decl weak now. */
6204 if (current_scope == file_scope)
6205 maybe_apply_pragma_weak (decl1);
6207 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6208 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6210 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6211 != integer_type_node)
6212 pedwarn (OPT_Wmain, "return type of %q+D is not %<int%>", decl1);
6214 check_main_parameter_types(decl1);
6216 if (!TREE_PUBLIC (decl1))
6217 pedwarn (OPT_Wmain, "%q+D is normally a non-static function", decl1);
6220 /* Record the decl so that the function name is defined.
6221 If we already have a decl for this name, and it is a FUNCTION_DECL,
6222 use the old decl. */
6224 current_function_decl = pushdecl (decl1);
6227 declare_parm_level ();
6229 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6230 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6231 DECL_ARTIFICIAL (resdecl) = 1;
6232 DECL_IGNORED_P (resdecl) = 1;
6233 DECL_RESULT (current_function_decl) = resdecl;
6235 start_fname_decls ();
6240 /* Subroutine of store_parm_decls which handles new-style function
6241 definitions (prototype format). The parms already have decls, so we
6242 need only record them as in effect and complain if any redundant
6243 old-style parm decls were written. */
6245 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6249 if (current_scope->bindings)
6251 error ("%Jold-style parameter declarations in prototyped "
6252 "function definition", fndecl);
6254 /* Get rid of the old-style declarations. */
6258 /* Don't issue this warning for nested functions, and don't issue this
6259 warning if we got here because ARG_INFO_TYPES was error_mark_node
6260 (this happens when a function definition has just an ellipsis in
6261 its parameter list). */
6262 else if (!in_system_header && !current_function_scope
6263 && arg_info->types != error_mark_node)
6264 warning (OPT_Wtraditional,
6265 "%Jtraditional C rejects ISO C style function definitions",
6268 /* Now make all the parameter declarations visible in the function body.
6269 We can bypass most of the grunt work of pushdecl. */
6270 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6272 DECL_CONTEXT (decl) = current_function_decl;
6273 if (DECL_NAME (decl))
6275 bind (DECL_NAME (decl), decl, current_scope,
6276 /*invisible=*/false, /*nested=*/false);
6277 if (!TREE_USED (decl))
6278 warn_if_shadowing (decl);
6281 error ("%Jparameter name omitted", decl);
6284 /* Record the parameter list in the function declaration. */
6285 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6287 /* Now make all the ancillary declarations visible, likewise. */
6288 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6290 DECL_CONTEXT (decl) = current_function_decl;
6291 if (DECL_NAME (decl))
6292 bind (DECL_NAME (decl), decl, current_scope,
6293 /*invisible=*/false, /*nested=*/false);
6296 /* And all the tag declarations. */
6297 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6298 if (TREE_PURPOSE (decl))
6299 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6300 /*invisible=*/false, /*nested=*/false);
6303 /* Subroutine of store_parm_decls which handles old-style function
6304 definitions (separate parameter list and declarations). */
6307 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6309 struct c_binding *b;
6310 tree parm, decl, last;
6311 tree parmids = arg_info->parms;
6312 struct pointer_set_t *seen_args = pointer_set_create ();
6314 if (!in_system_header)
6315 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6318 /* Match each formal parameter name with its declaration. Save each
6319 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6320 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6322 if (TREE_VALUE (parm) == 0)
6324 error ("%Jparameter name missing from parameter list", fndecl);
6325 TREE_PURPOSE (parm) = 0;
6329 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6330 if (b && B_IN_CURRENT_SCOPE (b))
6333 /* If we got something other than a PARM_DECL it is an error. */
6334 if (TREE_CODE (decl) != PARM_DECL)
6335 error ("%q+D declared as a non-parameter", decl);
6336 /* If the declaration is already marked, we have a duplicate
6337 name. Complain and ignore the duplicate. */
6338 else if (pointer_set_contains (seen_args, decl))
6340 error ("multiple parameters named %q+D", decl);
6341 TREE_PURPOSE (parm) = 0;
6344 /* If the declaration says "void", complain and turn it into
6346 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6348 error ("parameter %q+D declared with void type", decl);
6349 TREE_TYPE (decl) = integer_type_node;
6350 DECL_ARG_TYPE (decl) = integer_type_node;
6351 layout_decl (decl, 0);
6353 warn_if_shadowing (decl);
6355 /* If no declaration found, default to int. */
6358 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6359 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6360 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6362 warn_if_shadowing (decl);
6365 pedwarn (0, "type of %q+D defaults to %<int%>", decl);
6367 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6370 TREE_PURPOSE (parm) = decl;
6371 pointer_set_insert (seen_args, decl);
6374 /* Now examine the parms chain for incomplete declarations
6375 and declarations with no corresponding names. */
6377 for (b = current_scope->bindings; b; b = b->prev)
6380 if (TREE_CODE (parm) != PARM_DECL)
6383 if (TREE_TYPE (parm) != error_mark_node
6384 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6386 error ("parameter %q+D has incomplete type", parm);
6387 TREE_TYPE (parm) = error_mark_node;
6390 if (!pointer_set_contains (seen_args, parm))
6392 error ("declaration for parameter %q+D but no such parameter", parm);
6394 /* Pretend the parameter was not missing.
6395 This gets us to a standard state and minimizes
6396 further error messages. */
6397 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6401 /* Chain the declarations together in the order of the list of
6402 names. Store that chain in the function decl, replacing the
6403 list of names. Update the current scope to match. */
6404 DECL_ARGUMENTS (fndecl) = 0;
6406 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6407 if (TREE_PURPOSE (parm))
6409 if (parm && TREE_PURPOSE (parm))
6411 last = TREE_PURPOSE (parm);
6412 DECL_ARGUMENTS (fndecl) = last;
6414 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6415 if (TREE_PURPOSE (parm))
6417 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6418 last = TREE_PURPOSE (parm);
6420 TREE_CHAIN (last) = 0;
6423 pointer_set_destroy (seen_args);
6425 /* If there was a previous prototype,
6426 set the DECL_ARG_TYPE of each argument according to
6427 the type previously specified, and report any mismatches. */
6429 if (current_function_prototype_arg_types)
6432 for (parm = DECL_ARGUMENTS (fndecl),
6433 type = current_function_prototype_arg_types;
6434 parm || (type && TREE_VALUE (type) != error_mark_node
6435 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6436 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6438 if (parm == 0 || type == 0
6439 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6441 if (current_function_prototype_built_in)
6442 warning (0, "number of arguments doesn%'t match "
6443 "built-in prototype");
6446 error ("number of arguments doesn%'t match prototype");
6447 error ("%Hprototype declaration",
6448 ¤t_function_prototype_locus);
6452 /* Type for passing arg must be consistent with that
6453 declared for the arg. ISO C says we take the unqualified
6454 type for parameters declared with qualified type. */
6455 if (TREE_TYPE (parm) != error_mark_node
6456 && TREE_TYPE (type) != error_mark_node
6457 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6458 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6460 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6461 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6463 /* Adjust argument to match prototype. E.g. a previous
6464 `int foo(float);' prototype causes
6465 `int foo(x) float x; {...}' to be treated like
6466 `int foo(float x) {...}'. This is particularly
6467 useful for argument types like uid_t. */
6468 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6470 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6471 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6472 && TYPE_PRECISION (TREE_TYPE (parm))
6473 < TYPE_PRECISION (integer_type_node))
6474 DECL_ARG_TYPE (parm) = integer_type_node;
6476 /* ??? Is it possible to get here with a
6477 built-in prototype or will it always have
6478 been diagnosed as conflicting with an
6479 old-style definition and discarded? */
6480 if (current_function_prototype_built_in)
6481 warning (OPT_pedantic, "promoted argument %qD "
6482 "doesn%'t match built-in prototype", parm);
6485 pedwarn (OPT_pedantic, "promoted argument %qD "
6486 "doesn%'t match prototype", parm);
6487 pedwarn (OPT_pedantic, "%Hprototype declaration",
6488 ¤t_function_prototype_locus);
6493 if (current_function_prototype_built_in)
6494 warning (0, "argument %qD doesn%'t match "
6495 "built-in prototype", parm);
6498 error ("argument %qD doesn%'t match prototype", parm);
6499 error ("%Hprototype declaration",
6500 ¤t_function_prototype_locus);
6505 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6508 /* Otherwise, create a prototype that would match. */
6512 tree actual = 0, last = 0, type;
6514 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6516 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6518 TREE_CHAIN (last) = type;
6523 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6525 TREE_CHAIN (last) = type;
6529 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6530 of the type of this function, but we need to avoid having this
6531 affect the types of other similarly-typed functions, so we must
6532 first force the generation of an identical (but separate) type
6533 node for the relevant function type. The new node we create
6534 will be a variant of the main variant of the original function
6537 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6539 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6543 /* Store parameter declarations passed in ARG_INFO into the current
6544 function declaration. */
6547 store_parm_decls_from (struct c_arg_info *arg_info)
6549 current_function_arg_info = arg_info;
6550 store_parm_decls ();
6553 /* Store the parameter declarations into the current function declaration.
6554 This is called after parsing the parameter declarations, before
6555 digesting the body of the function.
6557 For an old-style definition, construct a prototype out of the old-style
6558 parameter declarations and inject it into the function's type. */
6561 store_parm_decls (void)
6563 tree fndecl = current_function_decl;
6566 /* The argument information block for FNDECL. */
6567 struct c_arg_info *arg_info = current_function_arg_info;
6568 current_function_arg_info = 0;
6570 /* True if this definition is written with a prototype. Note:
6571 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6572 list in a function definition as equivalent to (void) -- an
6573 empty argument list specifies the function has no parameters,
6574 but only (void) sets up a prototype for future calls. */
6575 proto = arg_info->types != 0;
6578 store_parm_decls_newstyle (fndecl, arg_info);
6580 store_parm_decls_oldstyle (fndecl, arg_info);
6582 /* The next call to push_scope will be a function body. */
6584 next_is_function_body = true;
6586 /* Write a record describing this function definition to the prototypes
6587 file (if requested). */
6589 gen_aux_info_record (fndecl, 1, 0, proto);
6591 /* Initialize the RTL code for the function. */
6592 allocate_struct_function (fndecl, false);
6594 /* Begin the statement tree for this function. */
6595 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6597 /* ??? Insert the contents of the pending sizes list into the function
6598 to be evaluated. The only reason left to have this is
6599 void foo(int n, int array[n++])
6600 because we throw away the array type in favor of a pointer type, and
6601 thus won't naturally see the SAVE_EXPR containing the increment. All
6602 other pending sizes would be handled by gimplify_parameters. */
6605 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6606 add_stmt (TREE_VALUE (t));
6609 /* Even though we're inside a function body, we still don't want to
6610 call expand_expr to calculate the size of a variable-sized array.
6611 We haven't necessarily assigned RTL to all variables yet, so it's
6612 not safe to try to expand expressions involving them. */
6613 cfun->dont_save_pending_sizes_p = 1;
6616 /* Emit diagnostics that require gimple input for detection. Operate on
6617 FNDECL and all its nested functions. */
6620 c_gimple_diagnostics_recursively (tree fndecl)
6622 struct cgraph_node *cgn;
6623 gimple_seq body = gimple_body (fndecl);
6625 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6626 c_warn_unused_result (body);
6628 /* Notice when OpenMP structured block constraints are violated. */
6630 diagnose_omp_structured_block_errors (fndecl);
6632 /* Finalize all nested functions now. */
6633 cgn = cgraph_node (fndecl);
6634 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6635 c_gimple_diagnostics_recursively (cgn->decl);
6638 /* Finish up a function declaration and compile that function
6639 all the way to assembler language output. The free the storage
6640 for the function definition.
6642 This is called after parsing the body of the function definition. */
6645 finish_function (void)
6647 tree fndecl = current_function_decl;
6649 label_context_stack_se = label_context_stack_se->next;
6650 label_context_stack_vm = label_context_stack_vm->next;
6652 if (TREE_CODE (fndecl) == FUNCTION_DECL
6653 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6655 tree args = DECL_ARGUMENTS (fndecl);
6656 for (; args; args = TREE_CHAIN (args))
6658 tree type = TREE_TYPE (args);
6659 if (INTEGRAL_TYPE_P (type)
6660 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6661 DECL_ARG_TYPE (args) = integer_type_node;
6665 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6666 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6668 /* Must mark the RESULT_DECL as being in this function. */
6670 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6671 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6673 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6675 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6676 != integer_type_node)
6678 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6679 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6681 pedwarn (0, "return type of %q+D is not %<int%>", fndecl);
6687 tree stmt = c_finish_return (integer_zero_node);
6688 /* Hack. We don't want the middle-end to warn that this return
6689 is unreachable, so we mark its location as special. Using
6690 UNKNOWN_LOCATION has the problem that it gets clobbered in
6691 annotate_one_with_locus. A cleaner solution might be to
6692 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6694 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6699 /* Tie off the statement tree for this function. */
6700 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6702 finish_fname_decls ();
6704 /* Complain if there's just no return statement. */
6705 if (warn_return_type
6706 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6707 && !current_function_returns_value && !current_function_returns_null
6708 /* Don't complain if we are no-return. */
6709 && !current_function_returns_abnormally
6710 /* Don't warn for main(). */
6711 && !MAIN_NAME_P (DECL_NAME (fndecl))
6712 /* Or if they didn't actually specify a return type. */
6713 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6714 /* Normally, with -Wreturn-type, flow will complain, but we might
6715 optimize out static functions. */
6716 && !TREE_PUBLIC (fndecl))
6718 warning (OPT_Wreturn_type,
6719 "no return statement in function returning non-void");
6720 TREE_NO_WARNING (fndecl) = 1;
6723 /* Store the end of the function, so that we get good line number
6724 info for the epilogue. */
6725 cfun->function_end_locus = input_location;
6727 /* Finalize the ELF visibility for the function. */
6728 c_determine_visibility (fndecl);
6730 /* For GNU C extern inline functions disregard inline limits. */
6731 if (DECL_EXTERNAL (fndecl)
6732 && DECL_DECLARED_INLINE_P (fndecl))
6733 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6735 /* Genericize before inlining. Delay genericizing nested functions
6736 until their parent function is genericized. Since finalizing
6737 requires GENERIC, delay that as well. */
6739 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6740 && !undef_nested_function)
6742 if (!decl_function_context (fndecl))
6744 c_genericize (fndecl);
6745 c_gimple_diagnostics_recursively (fndecl);
6747 /* ??? Objc emits functions after finalizing the compilation unit.
6748 This should be cleaned up later and this conditional removed. */
6749 if (cgraph_global_info_ready)
6751 cgraph_add_new_function (fndecl, false);
6755 cgraph_finalize_function (fndecl, false);
6759 /* Register this function with cgraph just far enough to get it
6760 added to our parent's nested function list. Handy, since the
6761 C front end doesn't have such a list. */
6762 (void) cgraph_node (fndecl);
6766 if (!decl_function_context (fndecl))
6767 undef_nested_function = false;
6769 /* We're leaving the context of this function, so zap cfun.
6770 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6771 tree_rest_of_compilation. */
6773 current_function_decl = NULL;
6776 /* Check the declarations given in a for-loop for satisfying the C99
6777 constraints. If exactly one such decl is found, return it. */
6780 check_for_loop_decls (void)
6782 struct c_binding *b;
6783 tree one_decl = NULL_TREE;
6789 /* If we get here, declarations have been used in a for loop without
6790 the C99 for loop scope. This doesn't make much sense, so don't
6792 error ("%<for%> loop initial declaration used outside C99 mode");
6795 /* C99 subclause 6.8.5 paragraph 3:
6797 [#3] The declaration part of a for statement shall only
6798 declare identifiers for objects having storage class auto or
6801 It isn't clear whether, in this sentence, "identifiers" binds to
6802 "shall only declare" or to "objects" - that is, whether all identifiers
6803 declared must be identifiers for objects, or whether the restriction
6804 only applies to those that are. (A question on this in comp.std.c
6805 in November 2000 received no answer.) We implement the strictest
6806 interpretation, to avoid creating an extension which later causes
6809 for (b = current_scope->bindings; b; b = b->prev)
6812 tree decl = b->decl;
6817 switch (TREE_CODE (decl))
6820 if (TREE_STATIC (decl))
6821 error ("declaration of static variable %q+D in %<for%> loop "
6822 "initial declaration", decl);
6823 else if (DECL_EXTERNAL (decl))
6824 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6825 "initial declaration", decl);
6829 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6833 error ("%<union %E%> declared in %<for%> loop initial declaration",
6837 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6841 error ("declaration of non-variable %q+D in %<for%> loop "
6842 "initial declaration", decl);
6849 return n_decls == 1 ? one_decl : NULL_TREE;
6852 /* Save and reinitialize the variables
6853 used during compilation of a C function. */
6856 c_push_function_context (void)
6858 struct language_function *p;
6859 p = GGC_NEW (struct language_function);
6862 p->base.x_stmt_tree = c_stmt_tree;
6863 p->x_break_label = c_break_label;
6864 p->x_cont_label = c_cont_label;
6865 p->x_switch_stack = c_switch_stack;
6866 p->arg_info = current_function_arg_info;
6867 p->returns_value = current_function_returns_value;
6868 p->returns_null = current_function_returns_null;
6869 p->returns_abnormally = current_function_returns_abnormally;
6870 p->warn_about_return_type = warn_about_return_type;
6872 push_function_context ();
6875 /* Restore the variables used during compilation of a C function. */
6878 c_pop_function_context (void)
6880 struct language_function *p;
6882 pop_function_context ();
6884 cfun->language = NULL;
6886 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6887 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6889 /* Stop pointing to the local nodes about to be freed. */
6890 /* But DECL_INITIAL must remain nonzero so we know this
6891 was an actual function definition. */
6892 DECL_INITIAL (current_function_decl) = error_mark_node;
6893 DECL_ARGUMENTS (current_function_decl) = 0;
6896 c_stmt_tree = p->base.x_stmt_tree;
6897 c_break_label = p->x_break_label;
6898 c_cont_label = p->x_cont_label;
6899 c_switch_stack = p->x_switch_stack;
6900 current_function_arg_info = p->arg_info;
6901 current_function_returns_value = p->returns_value;
6902 current_function_returns_null = p->returns_null;
6903 current_function_returns_abnormally = p->returns_abnormally;
6904 warn_about_return_type = p->warn_about_return_type;
6907 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6910 c_dup_lang_specific_decl (tree decl)
6912 struct lang_decl *ld;
6914 if (!DECL_LANG_SPECIFIC (decl))
6917 ld = GGC_NEW (struct lang_decl);
6918 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6919 DECL_LANG_SPECIFIC (decl) = ld;
6922 /* The functions below are required for functionality of doing
6923 function at once processing in the C front end. Currently these
6924 functions are not called from anywhere in the C front end, but as
6925 these changes continue, that will change. */
6927 /* Returns the stmt_tree (if any) to which statements are currently
6928 being added. If there is no active statement-tree, NULL is
6932 current_stmt_tree (void)
6934 return &c_stmt_tree;
6937 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6941 anon_aggr_type_p (const_tree ARG_UNUSED (node))
6946 /* Return the global value of T as a symbol. */
6949 identifier_global_value (tree t)
6951 struct c_binding *b;
6953 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6954 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6960 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6961 otherwise the name is found in ridpointers from RID_INDEX. */
6964 record_builtin_type (enum rid rid_index, const char *name, tree type)
6968 id = ridpointers[(int) rid_index];
6970 id = get_identifier (name);
6971 decl = build_decl (TYPE_DECL, id, type);
6973 if (debug_hooks->type_decl)
6974 debug_hooks->type_decl (decl, false);
6977 /* Build the void_list_node (void_type_node having been created). */
6979 build_void_list_node (void)
6981 tree t = build_tree_list (NULL_TREE, void_type_node);
6985 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6988 build_c_parm (struct c_declspecs *specs, tree attrs,
6989 struct c_declarator *declarator)
6991 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6994 ret->declarator = declarator;
6998 /* Return a declarator with nested attributes. TARGET is the inner
6999 declarator to which these attributes apply. ATTRS are the
7002 struct c_declarator *
7003 build_attrs_declarator (tree attrs, struct c_declarator *target)
7005 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7006 ret->kind = cdk_attrs;
7007 ret->declarator = target;
7008 ret->u.attrs = attrs;
7012 /* Return a declarator for a function with arguments specified by ARGS
7013 and return type specified by TARGET. */
7015 struct c_declarator *
7016 build_function_declarator (struct c_arg_info *args,
7017 struct c_declarator *target)
7019 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7020 ret->kind = cdk_function;
7021 ret->declarator = target;
7022 ret->u.arg_info = args;
7026 /* Return a declarator for the identifier IDENT (which may be
7027 NULL_TREE for an abstract declarator). */
7029 struct c_declarator *
7030 build_id_declarator (tree ident)
7032 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7034 ret->declarator = 0;
7036 /* Default value - may get reset to a more precise location. */
7037 ret->id_loc = input_location;
7041 /* Return something to represent absolute declarators containing a *.
7042 TARGET is the absolute declarator that the * contains.
7043 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7044 to apply to the pointer type. */
7046 struct c_declarator *
7047 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7048 struct c_declarator *target)
7052 struct c_declarator *itarget = target;
7053 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7054 if (type_quals_attrs)
7056 attrs = type_quals_attrs->attrs;
7057 quals = quals_from_declspecs (type_quals_attrs);
7058 if (attrs != NULL_TREE)
7059 itarget = build_attrs_declarator (attrs, target);
7061 ret->kind = cdk_pointer;
7062 ret->declarator = itarget;
7063 ret->u.pointer_quals = quals;
7067 /* Return a pointer to a structure for an empty list of declaration
7070 struct c_declspecs *
7071 build_null_declspecs (void)
7073 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7077 ret->typespec_word = cts_none;
7078 ret->storage_class = csc_none;
7079 ret->declspecs_seen_p = false;
7080 ret->type_seen_p = false;
7081 ret->non_sc_seen_p = false;
7082 ret->typedef_p = false;
7083 ret->tag_defined_p = false;
7084 ret->explicit_signed_p = false;
7085 ret->deprecated_p = false;
7086 ret->default_int_p = false;
7087 ret->long_p = false;
7088 ret->long_long_p = false;
7089 ret->short_p = false;
7090 ret->signed_p = false;
7091 ret->unsigned_p = false;
7092 ret->complex_p = false;
7093 ret->inline_p = false;
7094 ret->thread_p = false;
7095 ret->const_p = false;
7096 ret->volatile_p = false;
7097 ret->restrict_p = false;
7098 ret->saturating_p = false;
7102 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7105 struct c_declspecs *
7106 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7110 specs->non_sc_seen_p = true;
7111 specs->declspecs_seen_p = true;
7112 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7113 && C_IS_RESERVED_WORD (qual));
7114 i = C_RID_CODE (qual);
7118 dupe = specs->const_p;
7119 specs->const_p = true;
7122 dupe = specs->volatile_p;
7123 specs->volatile_p = true;
7126 dupe = specs->restrict_p;
7127 specs->restrict_p = true;
7132 if (dupe && !flag_isoc99)
7133 pedwarn (OPT_pedantic, "duplicate %qE", qual);
7137 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7140 struct c_declspecs *
7141 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7143 tree type = spec.spec;
7144 specs->non_sc_seen_p = true;
7145 specs->declspecs_seen_p = true;
7146 specs->type_seen_p = true;
7147 if (TREE_DEPRECATED (type))
7148 specs->deprecated_p = true;
7150 /* Handle type specifier keywords. */
7151 if (TREE_CODE (type) == IDENTIFIER_NODE
7152 && C_IS_RESERVED_WORD (type)
7153 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
7155 enum rid i = C_RID_CODE (type);
7158 error ("two or more data types in declaration specifiers");
7161 if ((int) i <= (int) RID_LAST_MODIFIER)
7163 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7168 if (specs->long_long_p)
7170 error ("%<long long long%> is too long for GCC");
7175 if (specs->typespec_word == cts_double)
7177 error ("both %<long long%> and %<double%> in "
7178 "declaration specifiers");
7181 if (pedantic && !flag_isoc99 && !in_system_header)
7182 pedwarn (OPT_Wlong_long, "ISO C90 does not support %<long long%>");
7183 specs->long_long_p = 1;
7187 error ("both %<long%> and %<short%> in "
7188 "declaration specifiers");
7189 else if (specs->typespec_word == cts_void)
7190 error ("both %<long%> and %<void%> in "
7191 "declaration specifiers");
7192 else if (specs->typespec_word == cts_bool)
7193 error ("both %<long%> and %<_Bool%> in "
7194 "declaration specifiers");
7195 else if (specs->typespec_word == cts_char)
7196 error ("both %<long%> and %<char%> in "
7197 "declaration specifiers");
7198 else if (specs->typespec_word == cts_float)
7199 error ("both %<long%> and %<float%> in "
7200 "declaration specifiers");
7201 else if (specs->typespec_word == cts_dfloat32)
7202 error ("both %<long%> and %<_Decimal32%> in "
7203 "declaration specifiers");
7204 else if (specs->typespec_word == cts_dfloat64)
7205 error ("both %<long%> and %<_Decimal64%> in "
7206 "declaration specifiers");
7207 else if (specs->typespec_word == cts_dfloat128)
7208 error ("both %<long%> and %<_Decimal128%> in "
7209 "declaration specifiers");
7211 specs->long_p = true;
7214 dupe = specs->short_p;
7216 error ("both %<long%> and %<short%> in "
7217 "declaration specifiers");
7218 else if (specs->typespec_word == cts_void)
7219 error ("both %<short%> and %<void%> in "
7220 "declaration specifiers");
7221 else if (specs->typespec_word == cts_bool)
7222 error ("both %<short%> and %<_Bool%> in "
7223 "declaration specifiers");
7224 else if (specs->typespec_word == cts_char)
7225 error ("both %<short%> and %<char%> in "
7226 "declaration specifiers");
7227 else if (specs->typespec_word == cts_float)
7228 error ("both %<short%> and %<float%> in "
7229 "declaration specifiers");
7230 else if (specs->typespec_word == cts_double)
7231 error ("both %<short%> and %<double%> in "
7232 "declaration specifiers");
7233 else if (specs->typespec_word == cts_dfloat32)
7234 error ("both %<short%> and %<_Decimal32%> in "
7235 "declaration specifiers");
7236 else if (specs->typespec_word == cts_dfloat64)
7237 error ("both %<short%> and %<_Decimal64%> in "
7238 "declaration specifiers");
7239 else if (specs->typespec_word == cts_dfloat128)
7240 error ("both %<short%> and %<_Decimal128%> in "
7241 "declaration specifiers");
7243 specs->short_p = true;
7246 dupe = specs->signed_p;
7247 if (specs->unsigned_p)
7248 error ("both %<signed%> and %<unsigned%> in "
7249 "declaration specifiers");
7250 else if (specs->typespec_word == cts_void)
7251 error ("both %<signed%> and %<void%> in "
7252 "declaration specifiers");
7253 else if (specs->typespec_word == cts_bool)
7254 error ("both %<signed%> and %<_Bool%> in "
7255 "declaration specifiers");
7256 else if (specs->typespec_word == cts_float)
7257 error ("both %<signed%> and %<float%> in "
7258 "declaration specifiers");
7259 else if (specs->typespec_word == cts_double)
7260 error ("both %<signed%> and %<double%> in "
7261 "declaration specifiers");
7262 else if (specs->typespec_word == cts_dfloat32)
7263 error ("both %<signed%> and %<_Decimal32%> in "
7264 "declaration specifiers");
7265 else if (specs->typespec_word == cts_dfloat64)
7266 error ("both %<signed%> and %<_Decimal64%> in "
7267 "declaration specifiers");
7268 else if (specs->typespec_word == cts_dfloat128)
7269 error ("both %<signed%> and %<_Decimal128%> in "
7270 "declaration specifiers");
7272 specs->signed_p = true;
7275 dupe = specs->unsigned_p;
7276 if (specs->signed_p)
7277 error ("both %<signed%> and %<unsigned%> in "
7278 "declaration specifiers");
7279 else if (specs->typespec_word == cts_void)
7280 error ("both %<unsigned%> and %<void%> in "
7281 "declaration specifiers");
7282 else if (specs->typespec_word == cts_bool)
7283 error ("both %<unsigned%> and %<_Bool%> in "
7284 "declaration specifiers");
7285 else if (specs->typespec_word == cts_float)
7286 error ("both %<unsigned%> and %<float%> in "
7287 "declaration specifiers");
7288 else if (specs->typespec_word == cts_double)
7289 error ("both %<unsigned%> and %<double%> in "
7290 "declaration specifiers");
7291 else if (specs->typespec_word == cts_dfloat32)
7292 error ("both %<unsigned%> and %<_Decimal32%> in "
7293 "declaration specifiers");
7294 else if (specs->typespec_word == cts_dfloat64)
7295 error ("both %<unsigned%> and %<_Decimal64%> in "
7296 "declaration specifiers");
7297 else if (specs->typespec_word == cts_dfloat128)
7298 error ("both %<unsigned%> and %<_Decimal128%> in "
7299 "declaration specifiers");
7301 specs->unsigned_p = true;
7304 dupe = specs->complex_p;
7305 if (!flag_isoc99 && !in_system_header)
7306 pedwarn (OPT_pedantic, "ISO C90 does not support complex types");
7307 if (specs->typespec_word == cts_void)
7308 error ("both %<complex%> and %<void%> in "
7309 "declaration specifiers");
7310 else if (specs->typespec_word == cts_bool)
7311 error ("both %<complex%> and %<_Bool%> in "
7312 "declaration specifiers");
7313 else if (specs->typespec_word == cts_dfloat32)
7314 error ("both %<complex%> and %<_Decimal32%> in "
7315 "declaration specifiers");
7316 else if (specs->typespec_word == cts_dfloat64)
7317 error ("both %<complex%> and %<_Decimal64%> in "
7318 "declaration specifiers");
7319 else if (specs->typespec_word == cts_dfloat128)
7320 error ("both %<complex%> and %<_Decimal128%> in "
7321 "declaration specifiers");
7322 else if (specs->typespec_word == cts_fract)
7323 error ("both %<complex%> and %<_Fract%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_accum)
7326 error ("both %<complex%> and %<_Accum%> in "
7327 "declaration specifiers");
7328 else if (specs->saturating_p)
7329 error ("both %<complex%> and %<_Sat%> in "
7330 "declaration specifiers");
7332 specs->complex_p = true;
7335 dupe = specs->saturating_p;
7336 pedwarn (OPT_pedantic, "ISO C does not support saturating types");
7337 if (specs->typespec_word == cts_void)
7338 error ("both %<_Sat%> and %<void%> in "
7339 "declaration specifiers");
7340 else if (specs->typespec_word == cts_bool)
7341 error ("both %<_Sat%> and %<_Bool%> in "
7342 "declaration specifiers");
7343 else if (specs->typespec_word == cts_char)
7344 error ("both %<_Sat%> and %<char%> in "
7345 "declaration specifiers");
7346 else if (specs->typespec_word == cts_int)
7347 error ("both %<_Sat%> and %<int%> in "
7348 "declaration specifiers");
7349 else if (specs->typespec_word == cts_float)
7350 error ("both %<_Sat%> and %<float%> in "
7351 "declaration specifiers");
7352 else if (specs->typespec_word == cts_double)
7353 error ("both %<_Sat%> and %<double%> in "
7354 "declaration specifiers");
7355 else if (specs->typespec_word == cts_dfloat32)
7356 error ("both %<_Sat%> and %<_Decimal32%> in "
7357 "declaration specifiers");
7358 else if (specs->typespec_word == cts_dfloat64)
7359 error ("both %<_Sat%> and %<_Decimal64%> in "
7360 "declaration specifiers");
7361 else if (specs->typespec_word == cts_dfloat128)
7362 error ("both %<_Sat%> and %<_Decimal128%> in "
7363 "declaration specifiers");
7364 else if (specs->complex_p)
7365 error ("both %<_Sat%> and %<complex%> in "
7366 "declaration specifiers");
7368 specs->saturating_p = true;
7375 error ("duplicate %qE", type);
7381 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7382 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7383 if (specs->typespec_word != cts_none)
7385 error ("two or more data types in declaration specifiers");
7392 error ("both %<long%> and %<void%> in "
7393 "declaration specifiers");
7394 else if (specs->short_p)
7395 error ("both %<short%> and %<void%> in "
7396 "declaration specifiers");
7397 else if (specs->signed_p)
7398 error ("both %<signed%> and %<void%> in "
7399 "declaration specifiers");
7400 else if (specs->unsigned_p)
7401 error ("both %<unsigned%> and %<void%> in "
7402 "declaration specifiers");
7403 else if (specs->complex_p)
7404 error ("both %<complex%> and %<void%> in "
7405 "declaration specifiers");
7406 else if (specs->saturating_p)
7407 error ("both %<_Sat%> and %<void%> in "
7408 "declaration specifiers");
7410 specs->typespec_word = cts_void;
7414 error ("both %<long%> and %<_Bool%> in "
7415 "declaration specifiers");
7416 else if (specs->short_p)
7417 error ("both %<short%> and %<_Bool%> in "
7418 "declaration specifiers");
7419 else if (specs->signed_p)
7420 error ("both %<signed%> and %<_Bool%> in "
7421 "declaration specifiers");
7422 else if (specs->unsigned_p)
7423 error ("both %<unsigned%> and %<_Bool%> in "
7424 "declaration specifiers");
7425 else if (specs->complex_p)
7426 error ("both %<complex%> and %<_Bool%> in "
7427 "declaration specifiers");
7428 else if (specs->saturating_p)
7429 error ("both %<_Sat%> and %<_Bool%> in "
7430 "declaration specifiers");
7432 specs->typespec_word = cts_bool;
7436 error ("both %<long%> and %<char%> in "
7437 "declaration specifiers");
7438 else if (specs->short_p)
7439 error ("both %<short%> and %<char%> in "
7440 "declaration specifiers");
7441 else if (specs->saturating_p)
7442 error ("both %<_Sat%> and %<char%> in "
7443 "declaration specifiers");
7445 specs->typespec_word = cts_char;
7448 if (specs->saturating_p)
7449 error ("both %<_Sat%> and %<int%> in "
7450 "declaration specifiers");
7452 specs->typespec_word = cts_int;
7456 error ("both %<long%> and %<float%> in "
7457 "declaration specifiers");
7458 else if (specs->short_p)
7459 error ("both %<short%> and %<float%> in "
7460 "declaration specifiers");
7461 else if (specs->signed_p)
7462 error ("both %<signed%> and %<float%> in "
7463 "declaration specifiers");
7464 else if (specs->unsigned_p)
7465 error ("both %<unsigned%> and %<float%> in "
7466 "declaration specifiers");
7467 else if (specs->saturating_p)
7468 error ("both %<_Sat%> and %<float%> in "
7469 "declaration specifiers");
7471 specs->typespec_word = cts_float;
7474 if (specs->long_long_p)
7475 error ("both %<long long%> and %<double%> in "
7476 "declaration specifiers");
7477 else if (specs->short_p)
7478 error ("both %<short%> and %<double%> in "
7479 "declaration specifiers");
7480 else if (specs->signed_p)
7481 error ("both %<signed%> and %<double%> in "
7482 "declaration specifiers");
7483 else if (specs->unsigned_p)
7484 error ("both %<unsigned%> and %<double%> in "
7485 "declaration specifiers");
7486 else if (specs->saturating_p)
7487 error ("both %<_Sat%> and %<double%> in "
7488 "declaration specifiers");
7490 specs->typespec_word = cts_double;
7497 if (i == RID_DFLOAT32)
7499 else if (i == RID_DFLOAT64)
7502 str = "_Decimal128";
7503 if (specs->long_long_p)
7504 error ("both %<long long%> and %<%s%> in "
7505 "declaration specifiers", str);
7507 error ("both %<long%> and %<%s%> in "
7508 "declaration specifiers", str);
7509 else if (specs->short_p)
7510 error ("both %<short%> and %<%s%> in "
7511 "declaration specifiers", str);
7512 else if (specs->signed_p)
7513 error ("both %<signed%> and %<%s%> in "
7514 "declaration specifiers", str);
7515 else if (specs->unsigned_p)
7516 error ("both %<unsigned%> and %<%s%> in "
7517 "declaration specifiers", str);
7518 else if (specs->complex_p)
7519 error ("both %<complex%> and %<%s%> in "
7520 "declaration specifiers", str);
7521 else if (specs->saturating_p)
7522 error ("both %<_Sat%> and %<%s%> in "
7523 "declaration specifiers", str);
7524 else if (i == RID_DFLOAT32)
7525 specs->typespec_word = cts_dfloat32;
7526 else if (i == RID_DFLOAT64)
7527 specs->typespec_word = cts_dfloat64;
7529 specs->typespec_word = cts_dfloat128;
7531 if (!targetm.decimal_float_supported_p ())
7532 error ("decimal floating point not supported for this target");
7533 pedwarn (OPT_pedantic,
7534 "ISO C does not support decimal floating point");
7544 if (specs->complex_p)
7545 error ("both %<complex%> and %<%s%> in "
7546 "declaration specifiers", str);
7547 else if (i == RID_FRACT)
7548 specs->typespec_word = cts_fract;
7550 specs->typespec_word = cts_accum;
7552 if (!targetm.fixed_point_supported_p ())
7553 error ("fixed-point types not supported for this target");
7554 pedwarn (OPT_pedantic,
7555 "ISO C does not support fixed-point types");
7558 /* ObjC reserved word "id", handled below. */
7564 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7565 form of ObjC type, cases such as "int" and "long" being handled
7566 above), a TYPE (struct, union, enum and typeof specifiers) or an
7567 ERROR_MARK. In none of these cases may there have previously
7568 been any type specifiers. */
7569 if (specs->type || specs->typespec_word != cts_none
7570 || specs->long_p || specs->short_p || specs->signed_p
7571 || specs->unsigned_p || specs->complex_p)
7572 error ("two or more data types in declaration specifiers");
7573 else if (TREE_CODE (type) == TYPE_DECL)
7575 if (TREE_TYPE (type) == error_mark_node)
7576 ; /* Allow the type to default to int to avoid cascading errors. */
7579 specs->type = TREE_TYPE (type);
7580 specs->decl_attr = DECL_ATTRIBUTES (type);
7581 specs->typedef_p = true;
7582 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7585 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7587 tree t = lookup_name (type);
7588 if (!t || TREE_CODE (t) != TYPE_DECL)
7589 error ("%qE fails to be a typedef or built in type", type);
7590 else if (TREE_TYPE (t) == error_mark_node)
7593 specs->type = TREE_TYPE (t);
7595 else if (TREE_CODE (type) != ERROR_MARK)
7597 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7598 specs->tag_defined_p = true;
7599 if (spec.kind == ctsk_typeof)
7600 specs->typedef_p = true;
7607 /* Add the storage class specifier or function specifier SCSPEC to the
7608 declaration specifiers SPECS, returning SPECS. */
7610 struct c_declspecs *
7611 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7614 enum c_storage_class n = csc_none;
7616 specs->declspecs_seen_p = true;
7617 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7618 && C_IS_RESERVED_WORD (scspec));
7619 i = C_RID_CODE (scspec);
7620 if (specs->non_sc_seen_p)
7621 warning (OPT_Wold_style_declaration,
7622 "%qE is not at beginning of declaration", scspec);
7626 /* C99 permits duplicate inline. Although of doubtful utility,
7627 it seems simplest to permit it in gnu89 mode as well, as
7628 there is also little utility in maintaining this as a
7629 difference between gnu89 and C99 inline. */
7631 specs->inline_p = true;
7634 dupe = specs->thread_p;
7635 if (specs->storage_class == csc_auto)
7636 error ("%<__thread%> used with %<auto%>");
7637 else if (specs->storage_class == csc_register)
7638 error ("%<__thread%> used with %<register%>");
7639 else if (specs->storage_class == csc_typedef)
7640 error ("%<__thread%> used with %<typedef%>");
7642 specs->thread_p = true;
7649 /* Diagnose "__thread extern". */
7650 if (specs->thread_p)
7651 error ("%<__thread%> before %<extern%>");
7658 /* Diagnose "__thread static". */
7659 if (specs->thread_p)
7660 error ("%<__thread%> before %<static%>");
7668 if (n != csc_none && n == specs->storage_class)
7671 error ("duplicate %qE", scspec);
7674 if (specs->storage_class != csc_none && n != specs->storage_class)
7676 error ("multiple storage classes in declaration specifiers");
7680 specs->storage_class = n;
7681 if (n != csc_extern && n != csc_static && specs->thread_p)
7683 error ("%<__thread%> used with %qE", scspec);
7684 specs->thread_p = false;
7691 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7694 struct c_declspecs *
7695 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7697 specs->attrs = chainon (attrs, specs->attrs);
7698 specs->declspecs_seen_p = true;
7702 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7703 specifiers with any other type specifier to determine the resulting
7704 type. This is where ISO C checks on complex types are made, since
7705 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7708 struct c_declspecs *
7709 finish_declspecs (struct c_declspecs *specs)
7711 /* If a type was specified as a whole, we have no modifiers and are
7713 if (specs->type != NULL_TREE)
7715 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7716 && !specs->signed_p && !specs->unsigned_p
7717 && !specs->complex_p);
7721 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7722 has been specified, treat it as "int" unless "_Complex" is
7723 present and there are no other specifiers. If we just have
7724 "_Complex", it is equivalent to "_Complex double", but e.g.
7725 "_Complex short" is equivalent to "_Complex short int". */
7726 if (specs->typespec_word == cts_none)
7728 if (specs->saturating_p)
7730 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7731 specs->typespec_word = cts_fract;
7733 else if (specs->long_p || specs->short_p
7734 || specs->signed_p || specs->unsigned_p)
7736 specs->typespec_word = cts_int;
7738 else if (specs->complex_p)
7740 specs->typespec_word = cts_double;
7741 pedwarn (OPT_pedantic,
7742 "ISO C does not support plain %<complex%> meaning "
7743 "%<double complex%>");
7747 specs->typespec_word = cts_int;
7748 specs->default_int_p = true;
7749 /* We don't diagnose this here because grokdeclarator will
7750 give more specific diagnostics according to whether it is
7751 a function definition. */
7755 /* If "signed" was specified, record this to distinguish "int" and
7756 "signed int" in the case of a bit-field with
7757 -funsigned-bitfields. */
7758 specs->explicit_signed_p = specs->signed_p;
7760 /* Now compute the actual type. */
7761 switch (specs->typespec_word)
7764 gcc_assert (!specs->long_p && !specs->short_p
7765 && !specs->signed_p && !specs->unsigned_p
7766 && !specs->complex_p);
7767 specs->type = void_type_node;
7770 gcc_assert (!specs->long_p && !specs->short_p
7771 && !specs->signed_p && !specs->unsigned_p
7772 && !specs->complex_p);
7773 specs->type = boolean_type_node;
7776 gcc_assert (!specs->long_p && !specs->short_p);
7777 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7778 if (specs->signed_p)
7779 specs->type = signed_char_type_node;
7780 else if (specs->unsigned_p)
7781 specs->type = unsigned_char_type_node;
7783 specs->type = char_type_node;
7784 if (specs->complex_p)
7786 pedwarn (OPT_pedantic,
7787 "ISO C does not support complex integer types");
7788 specs->type = build_complex_type (specs->type);
7792 gcc_assert (!(specs->long_p && specs->short_p));
7793 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7794 if (specs->long_long_p)
7795 specs->type = (specs->unsigned_p
7796 ? long_long_unsigned_type_node
7797 : long_long_integer_type_node);
7798 else if (specs->long_p)
7799 specs->type = (specs->unsigned_p
7800 ? long_unsigned_type_node
7801 : long_integer_type_node);
7802 else if (specs->short_p)
7803 specs->type = (specs->unsigned_p
7804 ? short_unsigned_type_node
7805 : short_integer_type_node);
7807 specs->type = (specs->unsigned_p
7808 ? unsigned_type_node
7809 : integer_type_node);
7810 if (specs->complex_p)
7812 pedwarn (OPT_pedantic,
7813 "ISO C does not support complex integer types");
7814 specs->type = build_complex_type (specs->type);
7818 gcc_assert (!specs->long_p && !specs->short_p
7819 && !specs->signed_p && !specs->unsigned_p);
7820 specs->type = (specs->complex_p
7821 ? complex_float_type_node
7825 gcc_assert (!specs->long_long_p && !specs->short_p
7826 && !specs->signed_p && !specs->unsigned_p);
7829 specs->type = (specs->complex_p
7830 ? complex_long_double_type_node
7831 : long_double_type_node);
7835 specs->type = (specs->complex_p
7836 ? complex_double_type_node
7837 : double_type_node);
7843 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7844 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7845 if (specs->typespec_word == cts_dfloat32)
7846 specs->type = dfloat32_type_node;
7847 else if (specs->typespec_word == cts_dfloat64)
7848 specs->type = dfloat64_type_node;
7850 specs->type = dfloat128_type_node;
7853 gcc_assert (!specs->complex_p);
7854 if (specs->saturating_p)
7856 if (specs->long_long_p)
7857 specs->type = specs->unsigned_p
7858 ? sat_unsigned_long_long_fract_type_node
7859 : sat_long_long_fract_type_node;
7860 else if (specs->long_p)
7861 specs->type = specs->unsigned_p
7862 ? sat_unsigned_long_fract_type_node
7863 : sat_long_fract_type_node;
7864 else if (specs->short_p)
7865 specs->type = specs->unsigned_p
7866 ? sat_unsigned_short_fract_type_node
7867 : sat_short_fract_type_node;
7869 specs->type = specs->unsigned_p
7870 ? sat_unsigned_fract_type_node
7871 : sat_fract_type_node;
7875 if (specs->long_long_p)
7876 specs->type = specs->unsigned_p
7877 ? unsigned_long_long_fract_type_node
7878 : long_long_fract_type_node;
7879 else if (specs->long_p)
7880 specs->type = specs->unsigned_p
7881 ? unsigned_long_fract_type_node
7882 : long_fract_type_node;
7883 else if (specs->short_p)
7884 specs->type = specs->unsigned_p
7885 ? unsigned_short_fract_type_node
7886 : short_fract_type_node;
7888 specs->type = specs->unsigned_p
7889 ? unsigned_fract_type_node
7894 gcc_assert (!specs->complex_p);
7895 if (specs->saturating_p)
7897 if (specs->long_long_p)
7898 specs->type = specs->unsigned_p
7899 ? sat_unsigned_long_long_accum_type_node
7900 : sat_long_long_accum_type_node;
7901 else if (specs->long_p)
7902 specs->type = specs->unsigned_p
7903 ? sat_unsigned_long_accum_type_node
7904 : sat_long_accum_type_node;
7905 else if (specs->short_p)
7906 specs->type = specs->unsigned_p
7907 ? sat_unsigned_short_accum_type_node
7908 : sat_short_accum_type_node;
7910 specs->type = specs->unsigned_p
7911 ? sat_unsigned_accum_type_node
7912 : sat_accum_type_node;
7916 if (specs->long_long_p)
7917 specs->type = specs->unsigned_p
7918 ? unsigned_long_long_accum_type_node
7919 : long_long_accum_type_node;
7920 else if (specs->long_p)
7921 specs->type = specs->unsigned_p
7922 ? unsigned_long_accum_type_node
7923 : long_accum_type_node;
7924 else if (specs->short_p)
7925 specs->type = specs->unsigned_p
7926 ? unsigned_short_accum_type_node
7927 : short_accum_type_node;
7929 specs->type = specs->unsigned_p
7930 ? unsigned_accum_type_node
7941 /* A subroutine of c_write_global_declarations. Perform final processing
7942 on one file scope's declarations (or the external scope's declarations),
7946 c_write_global_declarations_1 (tree globals)
7951 /* Process the decls in the order they were written. */
7952 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7954 /* Check for used but undefined static functions using the C
7955 standard's definition of "used", and set TREE_NO_WARNING so
7956 that check_global_declarations doesn't repeat the check. */
7957 if (TREE_CODE (decl) == FUNCTION_DECL
7958 && DECL_INITIAL (decl) == 0
7959 && DECL_EXTERNAL (decl)
7960 && !TREE_PUBLIC (decl)
7961 && C_DECL_USED (decl))
7963 pedwarn (0, "%q+F used but never defined", decl);
7964 TREE_NO_WARNING (decl) = 1;
7967 wrapup_global_declaration_1 (decl);
7973 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7974 reconsider |= wrapup_global_declaration_2 (decl);
7978 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7979 check_global_declaration_1 (decl);
7982 /* A subroutine of c_write_global_declarations Emit debug information for each
7983 of the declarations in GLOBALS. */
7986 c_write_global_declarations_2 (tree globals)
7990 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7991 debug_hooks->global_decl (decl);
7994 /* Preserve the external declarations scope across a garbage collect. */
7995 static GTY(()) tree ext_block;
7998 c_write_global_declarations (void)
8002 /* We don't want to do this if generating a PCH. */
8006 /* Don't waste time on further processing if -fsyntax-only or we've
8007 encountered errors. */
8008 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
8011 /* Close the external scope. */
8012 ext_block = pop_scope ();
8014 gcc_assert (!current_scope);
8018 tree tmp = BLOCK_VARS (ext_block);
8020 FILE * stream = dump_begin (TDI_tu, &flags);
8023 dump_node (tmp, flags & ~TDF_SLIM, stream);
8024 dump_end (TDI_tu, stream);
8028 /* Process all file scopes in this compilation, and the external_scope,
8029 through wrapup_global_declarations and check_global_declarations. */
8030 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8031 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8032 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8034 /* We're done parsing; proceed to optimize and emit assembly.
8035 FIXME: shouldn't be the front end's responsibility to call this. */
8038 /* After cgraph has had a chance to emit everything that's going to
8039 be emitted, output debug information for globals. */
8040 if (errorcount == 0 && sorrycount == 0)
8042 timevar_push (TV_SYMOUT);
8043 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8044 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8045 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8046 timevar_pop (TV_SYMOUT);
8052 #include "gt-c-decl.h"