1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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 else if (DECL_DECLARED_INLINE_P (p)
786 && !DECL_INITIAL (p))
788 /* C99 6.7.4p6: "a function with external linkage... declared
789 with an inline function specifier ... shall also be defined
790 in the same translation unit." */
791 if (!flag_gnu89_inline)
792 pedwarn (input_location, 0,
793 "inline function %q+D declared but never defined", p);
794 DECL_EXTERNAL (p) = 1;
800 /* Warnings for unused variables. */
802 && !TREE_NO_WARNING (p)
803 && !DECL_IN_SYSTEM_HEADER (p)
805 && !DECL_ARTIFICIAL (p)
806 && scope != file_scope
807 && scope != external_scope)
808 warning (OPT_Wunused_variable, "unused variable %q+D", p);
812 error ("type of array %q+D completed incompatibly with"
813 " implicit initialization", p);
820 /* All of these go in BLOCK_VARS, but only if this is the
821 binding in the home scope. */
824 TREE_CHAIN (p) = BLOCK_VARS (block);
825 BLOCK_VARS (block) = p;
827 /* If this is the file scope, and we are processing more
828 than one translation unit in this compilation, set
829 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
830 This makes same_translation_unit_p work, and causes
831 static declarations to be given disambiguating suffixes. */
832 if (scope == file_scope && num_in_fnames > 1)
834 DECL_CONTEXT (p) = context;
835 if (TREE_CODE (p) == TYPE_DECL)
836 set_type_context (TREE_TYPE (p), context);
840 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
841 already been put there by store_parm_decls. Unused-
842 parameter warnings are handled by function.c.
843 error_mark_node obviously does not go in BLOCK_VARS and
844 does not get unused-variable warnings. */
847 /* It is possible for a decl not to have a name. We get
848 here with b->id NULL in this case. */
851 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
852 I_SYMBOL_BINDING (b->id) = b->shadowed;
853 if (b->shadowed && b->shadowed->type)
854 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
864 /* Dispose of the block that we just made inside some higher level. */
865 if ((scope->function_body || scope == file_scope) && context)
867 DECL_INITIAL (context) = block;
868 BLOCK_SUPERCONTEXT (block) = context;
870 else if (scope->outer)
873 SCOPE_LIST_APPEND (scope->outer, blocks, block);
874 /* If we did not make a block for the scope just exited, any
875 blocks made for inner scopes must be carried forward so they
876 will later become subblocks of something else. */
877 else if (scope->blocks)
878 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
881 /* Pop the current scope, and free the structure for reuse. */
882 current_scope = scope->outer;
883 if (scope->function_body)
884 current_function_scope = scope->outer_function;
886 memset (scope, 0, sizeof (struct c_scope));
887 scope->outer = scope_freelist;
888 scope_freelist = scope;
894 push_file_scope (void)
902 file_scope = current_scope;
904 start_fname_decls ();
906 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
907 bind (DECL_NAME (decl), decl, file_scope,
908 /*invisible=*/false, /*nested=*/true);
912 pop_file_scope (void)
914 /* In case there were missing closebraces, get us back to the global
916 while (current_scope != file_scope)
919 /* __FUNCTION__ is defined at file scope (""). This
920 call may not be necessary as my tests indicate it
921 still works without it. */
922 finish_fname_decls ();
924 /* This is the point to write out a PCH if we're doing that.
925 In that case we do not want to do anything else. */
928 c_common_write_pch ();
932 /* Pop off the file scope and close this translation unit. */
936 maybe_apply_pending_pragma_weaks ();
937 cgraph_finalize_compilation_unit ();
941 /* Push a definition or a declaration of struct, union or enum tag "name".
942 "type" should be the type node.
943 We assume that the tag "name" is not already defined.
945 Note that the definition may really be just a forward reference.
946 In that case, the TYPE_SIZE will be zero. */
949 pushtag (tree name, tree type)
951 /* Record the identifier as the type's name if it has none. */
952 if (name && !TYPE_NAME (type))
953 TYPE_NAME (type) = name;
954 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
956 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
957 tagged type we just added to the current scope. This fake
958 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
959 to output a representation of a tagged type, and it also gives
960 us a convenient place to record the "scope start" address for the
963 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
965 /* An approximation for now, so we can tell this is a function-scope tag.
966 This will be updated in pop_scope. */
967 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
970 /* Subroutine of compare_decls. Allow harmless mismatches in return
971 and argument types provided that the type modes match. This function
972 return a unified type given a suitable match, and 0 otherwise. */
975 match_builtin_function_types (tree newtype, tree oldtype)
977 tree newrettype, oldrettype;
978 tree newargs, oldargs;
979 tree trytype, tryargs;
981 /* Accept the return type of the new declaration if same modes. */
982 oldrettype = TREE_TYPE (oldtype);
983 newrettype = TREE_TYPE (newtype);
985 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
988 oldargs = TYPE_ARG_TYPES (oldtype);
989 newargs = TYPE_ARG_TYPES (newtype);
992 while (oldargs || newargs)
996 || !TREE_VALUE (oldargs)
997 || !TREE_VALUE (newargs)
998 || TYPE_MODE (TREE_VALUE (oldargs))
999 != TYPE_MODE (TREE_VALUE (newargs)))
1002 oldargs = TREE_CHAIN (oldargs);
1003 newargs = TREE_CHAIN (newargs);
1006 trytype = build_function_type (newrettype, tryargs);
1007 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1010 /* Subroutine of diagnose_mismatched_decls. Check for function type
1011 mismatch involving an empty arglist vs a nonempty one and give clearer
1014 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1015 tree newtype, tree oldtype)
1019 if (TREE_CODE (olddecl) != FUNCTION_DECL
1020 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1021 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1023 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1026 t = TYPE_ARG_TYPES (oldtype);
1028 t = TYPE_ARG_TYPES (newtype);
1029 for (; t; t = TREE_CHAIN (t))
1031 tree type = TREE_VALUE (t);
1033 if (TREE_CHAIN (t) == 0
1034 && TYPE_MAIN_VARIANT (type) != void_type_node)
1036 inform (input_location, "a parameter list with an ellipsis can%'t match "
1037 "an empty parameter name list declaration");
1041 if (c_type_promotes_to (type) != type)
1043 inform (input_location, "an argument type that has a default promotion can%'t match "
1044 "an empty parameter name list declaration");
1050 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1051 old-style function definition, NEWDECL is a prototype declaration.
1052 Diagnose inconsistencies in the argument list. Returns TRUE if
1053 the prototype is compatible, FALSE if not. */
1055 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1057 tree newargs, oldargs;
1060 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1062 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1063 newargs = TYPE_ARG_TYPES (newtype);
1068 tree oldargtype = TREE_VALUE (oldargs);
1069 tree newargtype = TREE_VALUE (newargs);
1071 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1074 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1075 newargtype = TYPE_MAIN_VARIANT (newargtype);
1077 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1080 /* Reaching the end of just one list means the two decls don't
1081 agree on the number of arguments. */
1082 if (END_OF_ARGLIST (oldargtype))
1084 error ("prototype for %q+D declares more arguments "
1085 "than previous old-style definition", newdecl);
1088 else if (END_OF_ARGLIST (newargtype))
1090 error ("prototype for %q+D declares fewer arguments "
1091 "than previous old-style definition", newdecl);
1095 /* Type for passing arg must be consistent with that declared
1097 else if (!comptypes (oldargtype, newargtype))
1099 error ("prototype for %q+D declares argument %d"
1100 " with incompatible type",
1105 oldargs = TREE_CHAIN (oldargs);
1106 newargs = TREE_CHAIN (newargs);
1110 /* If we get here, no errors were found, but do issue a warning
1111 for this poor-style construct. */
1112 warning (0, "prototype for %q+D follows non-prototype definition",
1115 #undef END_OF_ARGLIST
1118 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1119 first in a pair of mismatched declarations, using the diagnostic
1122 locate_old_decl (tree decl)
1124 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1126 else if (DECL_INITIAL (decl))
1127 inform (input_location, "previous definition of %q+D was here", decl);
1128 else if (C_DECL_IMPLICIT (decl))
1129 inform (input_location, "previous implicit declaration of %q+D was here", decl);
1131 inform (input_location, "previous declaration of %q+D was here", decl);
1134 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1135 Returns true if the caller should proceed to merge the two, false
1136 if OLDDECL should simply be discarded. As a side effect, issues
1137 all necessary diagnostics for invalid or poor-style combinations.
1138 If it returns true, writes the types of NEWDECL and OLDDECL to
1139 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1140 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1143 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1144 tree *newtypep, tree *oldtypep)
1146 tree newtype, oldtype;
1147 bool pedwarned = false;
1148 bool warned = false;
1151 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1152 && DECL_EXTERNAL (DECL))
1154 /* If we have error_mark_node for either decl or type, just discard
1155 the previous decl - we're in an error cascade already. */
1156 if (olddecl == error_mark_node || newdecl == error_mark_node)
1158 *oldtypep = oldtype = TREE_TYPE (olddecl);
1159 *newtypep = newtype = TREE_TYPE (newdecl);
1160 if (oldtype == error_mark_node || newtype == error_mark_node)
1163 /* Two different categories of symbol altogether. This is an error
1164 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1165 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1167 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1168 && DECL_BUILT_IN (olddecl)
1169 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1171 error ("%q+D redeclared as different kind of symbol", newdecl);
1172 locate_old_decl (olddecl);
1174 else if (TREE_PUBLIC (newdecl))
1175 warning (0, "built-in function %q+D declared as non-function",
1178 warning (OPT_Wshadow, "declaration of %q+D shadows "
1179 "a built-in function", newdecl);
1183 /* Enumerators have no linkage, so may only be declared once in a
1185 if (TREE_CODE (olddecl) == CONST_DECL)
1187 error ("redeclaration of enumerator %q+D", newdecl);
1188 locate_old_decl (olddecl);
1192 if (!comptypes (oldtype, newtype))
1194 if (TREE_CODE (olddecl) == FUNCTION_DECL
1195 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1197 /* Accept harmless mismatch in function types.
1198 This is for the ffs and fprintf builtins. */
1199 tree trytype = match_builtin_function_types (newtype, oldtype);
1201 if (trytype && comptypes (newtype, trytype))
1202 *oldtypep = oldtype = trytype;
1205 /* If types don't match for a built-in, throw away the
1206 built-in. No point in calling locate_old_decl here, it
1207 won't print anything. */
1208 warning (0, "conflicting types for built-in function %q+D",
1213 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1214 && DECL_IS_BUILTIN (olddecl))
1216 /* A conflicting function declaration for a predeclared
1217 function that isn't actually built in. Objective C uses
1218 these. The new declaration silently overrides everything
1219 but the volatility (i.e. noreturn) indication. See also
1220 below. FIXME: Make Objective C use normal builtins. */
1221 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1224 /* Permit void foo (...) to match int foo (...) if the latter is
1225 the definition and implicit int was used. See
1226 c-torture/compile/920625-2.c. */
1227 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1228 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1229 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1230 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1232 pedwarned = pedwarn (input_location, 0,
1233 "conflicting types for %q+D", newdecl);
1234 /* Make sure we keep void as the return type. */
1235 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1236 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1238 /* Permit void foo (...) to match an earlier call to foo (...) with
1239 no declared type (thus, implicitly int). */
1240 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1241 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1242 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1243 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1245 pedwarned = pedwarn (input_location, 0,
1246 "conflicting types for %q+D", newdecl);
1247 /* Make sure we keep void as the return type. */
1248 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1252 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1253 error ("conflicting type qualifiers for %q+D", newdecl);
1255 error ("conflicting types for %q+D", newdecl);
1256 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1257 locate_old_decl (olddecl);
1262 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1263 but silently ignore the redeclaration if either is in a system
1264 header. (Conflicting redeclarations were handled above.) */
1265 if (TREE_CODE (newdecl) == TYPE_DECL)
1267 if (DECL_IN_SYSTEM_HEADER (newdecl)
1268 || DECL_IN_SYSTEM_HEADER (olddecl)
1269 || TREE_NO_WARNING (newdecl)
1270 || TREE_NO_WARNING (olddecl))
1271 return true; /* Allow OLDDECL to continue in use. */
1273 error ("redefinition of typedef %q+D", newdecl);
1274 locate_old_decl (olddecl);
1278 /* Function declarations can either be 'static' or 'extern' (no
1279 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1280 can never conflict with each other on account of linkage
1281 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1282 gnu89 mode permits two definitions if one is 'extern inline' and
1283 one is not. The non- extern-inline definition supersedes the
1284 extern-inline definition. */
1286 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1288 /* If you declare a built-in function name as static, or
1289 define the built-in with an old-style definition (so we
1290 can't validate the argument list) the built-in definition is
1291 overridden, but optionally warn this was a bad choice of name. */
1292 if (DECL_BUILT_IN (olddecl)
1293 && !C_DECL_DECLARED_BUILTIN (olddecl)
1294 && (!TREE_PUBLIC (newdecl)
1295 || (DECL_INITIAL (newdecl)
1296 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1298 warning (OPT_Wshadow, "declaration of %q+D shadows "
1299 "a built-in function", newdecl);
1300 /* Discard the old built-in function. */
1304 if (DECL_INITIAL (newdecl))
1306 if (DECL_INITIAL (olddecl))
1308 /* If both decls are in the same TU and the new declaration
1309 isn't overriding an extern inline reject the new decl.
1310 In c99, no overriding is allowed in the same translation
1312 if ((!DECL_EXTERN_INLINE (olddecl)
1313 || DECL_EXTERN_INLINE (newdecl)
1314 || (!flag_gnu89_inline
1315 && (!DECL_DECLARED_INLINE_P (olddecl)
1316 || !lookup_attribute ("gnu_inline",
1317 DECL_ATTRIBUTES (olddecl)))
1318 && (!DECL_DECLARED_INLINE_P (newdecl)
1319 || !lookup_attribute ("gnu_inline",
1320 DECL_ATTRIBUTES (newdecl))))
1322 && same_translation_unit_p (newdecl, olddecl))
1324 error ("redefinition of %q+D", newdecl);
1325 locate_old_decl (olddecl);
1330 /* If we have a prototype after an old-style function definition,
1331 the argument types must be checked specially. */
1332 else if (DECL_INITIAL (olddecl)
1333 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1334 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1335 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1337 locate_old_decl (olddecl);
1340 /* A non-static declaration (even an "extern") followed by a
1341 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1342 The same is true for a static forward declaration at block
1343 scope followed by a non-static declaration/definition at file
1344 scope. Static followed by non-static at the same scope is
1345 not undefined behavior, and is the most convenient way to get
1346 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1347 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1348 we do diagnose it if -Wtraditional. */
1349 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1351 /* Two exceptions to the rule. If olddecl is an extern
1352 inline, or a predeclared function that isn't actually
1353 built in, newdecl silently overrides olddecl. The latter
1354 occur only in Objective C; see also above. (FIXME: Make
1355 Objective C use normal builtins.) */
1356 if (!DECL_IS_BUILTIN (olddecl)
1357 && !DECL_EXTERN_INLINE (olddecl))
1359 error ("static declaration of %q+D follows "
1360 "non-static declaration", newdecl);
1361 locate_old_decl (olddecl);
1365 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1367 if (DECL_CONTEXT (olddecl))
1369 error ("non-static declaration of %q+D follows "
1370 "static declaration", newdecl);
1371 locate_old_decl (olddecl);
1374 else if (warn_traditional)
1376 warned |= warning (OPT_Wtraditional,
1377 "non-static declaration of %q+D "
1378 "follows static declaration", newdecl);
1382 /* Make sure gnu_inline attribute is either not present, or
1383 present on all inline decls. */
1384 if (DECL_DECLARED_INLINE_P (olddecl)
1385 && DECL_DECLARED_INLINE_P (newdecl))
1387 bool newa = lookup_attribute ("gnu_inline",
1388 DECL_ATTRIBUTES (newdecl)) != NULL;
1389 bool olda = lookup_attribute ("gnu_inline",
1390 DECL_ATTRIBUTES (olddecl)) != NULL;
1393 error ("%<gnu_inline%> attribute present on %q+D",
1394 newa ? newdecl : olddecl);
1395 error ("%Jbut not here", newa ? olddecl : newdecl);
1399 else if (TREE_CODE (newdecl) == VAR_DECL)
1401 /* Only variables can be thread-local, and all declarations must
1402 agree on this property. */
1403 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1405 /* Nothing to check. Since OLDDECL is marked threadprivate
1406 and NEWDECL does not have a thread-local attribute, we
1407 will merge the threadprivate attribute into NEWDECL. */
1410 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1412 if (DECL_THREAD_LOCAL_P (newdecl))
1413 error ("thread-local declaration of %q+D follows "
1414 "non-thread-local declaration", newdecl);
1416 error ("non-thread-local declaration of %q+D follows "
1417 "thread-local declaration", newdecl);
1419 locate_old_decl (olddecl);
1423 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1424 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1426 error ("redefinition of %q+D", newdecl);
1427 locate_old_decl (olddecl);
1431 /* Objects declared at file scope: if the first declaration had
1432 external linkage (even if it was an external reference) the
1433 second must have external linkage as well, or the behavior is
1434 undefined. If the first declaration had internal linkage, then
1435 the second must too, or else be an external reference (in which
1436 case the composite declaration still has internal linkage).
1437 As for function declarations, we warn about the static-then-
1438 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1439 if (DECL_FILE_SCOPE_P (newdecl)
1440 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1442 if (DECL_EXTERNAL (newdecl))
1444 if (!DECL_FILE_SCOPE_P (olddecl))
1446 error ("extern declaration of %q+D follows "
1447 "declaration with no linkage", newdecl);
1448 locate_old_decl (olddecl);
1451 else if (warn_traditional)
1453 warned |= warning (OPT_Wtraditional,
1454 "non-static declaration of %q+D "
1455 "follows static declaration", newdecl);
1460 if (TREE_PUBLIC (newdecl))
1461 error ("non-static declaration of %q+D follows "
1462 "static declaration", newdecl);
1464 error ("static declaration of %q+D follows "
1465 "non-static declaration", newdecl);
1467 locate_old_decl (olddecl);
1471 /* Two objects with the same name declared at the same block
1472 scope must both be external references (6.7p3). */
1473 else if (!DECL_FILE_SCOPE_P (newdecl))
1475 if (DECL_EXTERNAL (newdecl))
1477 /* Extern with initializer at block scope, which will
1478 already have received an error. */
1480 else if (DECL_EXTERNAL (olddecl))
1482 error ("declaration of %q+D with no linkage follows "
1483 "extern declaration", newdecl);
1484 locate_old_decl (olddecl);
1488 error ("redeclaration of %q+D with no linkage", newdecl);
1489 locate_old_decl (olddecl);
1497 /* All decls must agree on a visibility. */
1498 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1499 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1500 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1502 warned |= warning (0, "redeclaration of %q+D with different visibility "
1503 "(old visibility preserved)", newdecl);
1506 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1508 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1509 if (DECL_DECLARED_INLINE_P (newdecl)
1510 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1512 warned |= warning (OPT_Wattributes,
1513 "inline declaration of %qD follows "
1514 "declaration with attribute noinline", newdecl);
1516 else if (DECL_DECLARED_INLINE_P (olddecl)
1517 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1519 warned |= warning (OPT_Wattributes,
1520 "declaration of %q+D with attribute "
1521 "noinline follows inline declaration ", newdecl);
1524 else /* PARM_DECL, VAR_DECL */
1526 /* Redeclaration of a parameter is a constraint violation (this is
1527 not explicitly stated, but follows from C99 6.7p3 [no more than
1528 one declaration of the same identifier with no linkage in the
1529 same scope, except type tags] and 6.2.2p6 [parameters have no
1530 linkage]). We must check for a forward parameter declaration,
1531 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1532 an extension, the mandatory diagnostic for which is handled by
1533 mark_forward_parm_decls. */
1535 if (TREE_CODE (newdecl) == PARM_DECL
1536 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1538 error ("redefinition of parameter %q+D", newdecl);
1539 locate_old_decl (olddecl);
1544 /* Optional warning for completely redundant decls. */
1545 if (!warned && !pedwarned
1546 && warn_redundant_decls
1547 /* Don't warn about a function declaration followed by a
1549 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1550 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1551 /* Don't warn about redundant redeclarations of builtins. */
1552 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1553 && !DECL_BUILT_IN (newdecl)
1554 && DECL_BUILT_IN (olddecl)
1555 && !C_DECL_DECLARED_BUILTIN (olddecl))
1556 /* Don't warn about an extern followed by a definition. */
1557 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1558 /* Don't warn about forward parameter decls. */
1559 && !(TREE_CODE (newdecl) == PARM_DECL
1560 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1561 /* Don't warn about a variable definition following a declaration. */
1562 && !(TREE_CODE (newdecl) == VAR_DECL
1563 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1565 warned = warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1569 /* Report location of previous decl/defn. */
1570 if (warned || pedwarned)
1571 locate_old_decl (olddecl);
1573 #undef DECL_EXTERN_INLINE
1578 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1579 consistent with OLDDECL, but carries new information. Merge the
1580 new information into OLDDECL. This function issues no
1584 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1586 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1587 && DECL_INITIAL (newdecl) != 0);
1588 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1589 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1590 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1591 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1592 bool extern_changed = false;
1594 /* For real parm decl following a forward decl, rechain the old decl
1595 in its new location and clear TREE_ASM_WRITTEN (it's not a
1596 forward decl anymore). */
1597 if (TREE_CODE (newdecl) == PARM_DECL
1598 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1600 struct c_binding *b, **here;
1602 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1603 if ((*here)->decl == olddecl)
1610 b->prev = current_scope->bindings;
1611 current_scope->bindings = b;
1613 TREE_ASM_WRITTEN (olddecl) = 0;
1616 DECL_ATTRIBUTES (newdecl)
1617 = targetm.merge_decl_attributes (olddecl, newdecl);
1619 /* Merge the data types specified in the two decls. */
1621 = TREE_TYPE (olddecl)
1622 = composite_type (newtype, oldtype);
1624 /* Lay the type out, unless already done. */
1625 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1627 if (TREE_TYPE (newdecl) != error_mark_node)
1628 layout_type (TREE_TYPE (newdecl));
1629 if (TREE_CODE (newdecl) != FUNCTION_DECL
1630 && TREE_CODE (newdecl) != TYPE_DECL
1631 && TREE_CODE (newdecl) != CONST_DECL)
1632 layout_decl (newdecl, 0);
1636 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1637 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1638 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1639 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1640 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1642 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1643 DECL_USER_ALIGN (newdecl) |= DECL_USER_ALIGN (olddecl);
1647 /* Keep the old rtl since we can safely use it. */
1648 if (HAS_RTL_P (olddecl))
1649 COPY_DECL_RTL (olddecl, newdecl);
1651 /* Merge the type qualifiers. */
1652 if (TREE_READONLY (newdecl))
1653 TREE_READONLY (olddecl) = 1;
1655 if (TREE_THIS_VOLATILE (newdecl))
1656 TREE_THIS_VOLATILE (olddecl) = 1;
1658 /* Merge deprecatedness. */
1659 if (TREE_DEPRECATED (newdecl))
1660 TREE_DEPRECATED (olddecl) = 1;
1662 /* If a decl is in a system header and the other isn't, keep the one on the
1663 system header. Otherwise, keep source location of definition rather than
1664 declaration and of prototype rather than non-prototype unless that
1665 prototype is built-in. */
1666 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1667 && DECL_IN_SYSTEM_HEADER (olddecl)
1668 && !DECL_IN_SYSTEM_HEADER (newdecl) )
1669 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1670 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)
1671 && DECL_IN_SYSTEM_HEADER (newdecl)
1672 && !DECL_IN_SYSTEM_HEADER (olddecl))
1673 DECL_SOURCE_LOCATION (olddecl) = DECL_SOURCE_LOCATION (newdecl);
1674 else if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1675 || (old_is_prototype && !new_is_prototype
1676 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1677 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1679 /* Merge the initialization information. */
1680 if (DECL_INITIAL (newdecl) == 0)
1681 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1683 /* Merge the threadprivate attribute. */
1684 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1686 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1687 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1690 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1692 /* Merge the section attribute.
1693 We want to issue an error if the sections conflict but that
1694 must be done later in decl_attributes since we are called
1695 before attributes are assigned. */
1696 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1697 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1699 /* Copy the assembler name.
1700 Currently, it can only be defined in the prototype. */
1701 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1703 /* Use visibility of whichever declaration had it specified */
1704 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1706 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1707 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1710 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1712 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1713 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1714 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1715 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1716 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1717 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1718 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1719 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1720 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1721 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1722 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1725 /* Merge the storage class information. */
1726 merge_weak (newdecl, olddecl);
1728 /* For functions, static overrides non-static. */
1729 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1731 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1732 /* This is since we don't automatically
1733 copy the attributes of NEWDECL into OLDDECL. */
1734 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1735 /* If this clears `static', clear it in the identifier too. */
1736 if (!TREE_PUBLIC (olddecl))
1737 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1741 /* In c99, 'extern' declaration before (or after) 'inline' means this
1742 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1744 if (TREE_CODE (newdecl) == FUNCTION_DECL
1745 && !flag_gnu89_inline
1746 && (DECL_DECLARED_INLINE_P (newdecl)
1747 || DECL_DECLARED_INLINE_P (olddecl))
1748 && (!DECL_DECLARED_INLINE_P (newdecl)
1749 || !DECL_DECLARED_INLINE_P (olddecl)
1750 || !DECL_EXTERNAL (olddecl))
1751 && DECL_EXTERNAL (newdecl)
1752 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))
1753 && !current_function_decl)
1754 DECL_EXTERNAL (newdecl) = 0;
1756 if (DECL_EXTERNAL (newdecl))
1758 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1759 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1761 /* An extern decl does not override previous storage class. */
1762 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1763 if (!DECL_EXTERNAL (newdecl))
1765 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1766 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1771 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1772 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1775 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1777 /* If we're redefining a function previously defined as extern
1778 inline, make sure we emit debug info for the inline before we
1779 throw it away, in case it was inlined into a function that
1780 hasn't been written out yet. */
1781 if (new_is_definition && DECL_INITIAL (olddecl))
1782 /* The new defn must not be inline. */
1783 DECL_UNINLINABLE (newdecl) = 1;
1786 /* If either decl says `inline', this fn is inline, unless
1787 its definition was passed already. */
1788 if (DECL_DECLARED_INLINE_P (newdecl)
1789 || DECL_DECLARED_INLINE_P (olddecl))
1790 DECL_DECLARED_INLINE_P (newdecl) = 1;
1792 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1793 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1795 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1796 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1797 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1798 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1801 if (DECL_BUILT_IN (olddecl))
1803 /* If redeclaring a builtin function, it stays built in.
1804 But it gets tagged as having been declared. */
1805 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1806 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1807 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1808 if (new_is_prototype)
1809 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1811 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1812 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1815 /* Preserve function specific target and optimization options */
1816 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1817 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1818 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1819 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1821 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1822 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1823 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1824 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1826 /* Also preserve various other info from the definition. */
1827 if (!new_is_definition)
1829 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1830 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1831 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1832 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1833 gimple_set_body (newdecl, gimple_body (olddecl));
1834 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1836 /* See if we've got a function to instantiate from. */
1837 if (DECL_SAVED_TREE (olddecl))
1838 DECL_ABSTRACT_ORIGIN (newdecl)
1839 = DECL_ABSTRACT_ORIGIN (olddecl);
1843 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1845 /* Merge the USED information. */
1846 if (TREE_USED (olddecl))
1847 TREE_USED (newdecl) = 1;
1848 else if (TREE_USED (newdecl))
1849 TREE_USED (olddecl) = 1;
1851 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1852 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1854 unsigned olddecl_uid = DECL_UID (olddecl);
1855 tree olddecl_context = DECL_CONTEXT (olddecl);
1857 memcpy ((char *) olddecl + sizeof (struct tree_common),
1858 (char *) newdecl + sizeof (struct tree_common),
1859 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1860 switch (TREE_CODE (olddecl))
1863 gimple_set_body (olddecl, gimple_body (newdecl));
1873 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1874 (char *) newdecl + sizeof (struct tree_decl_common),
1875 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1880 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1881 (char *) newdecl + sizeof (struct tree_decl_common),
1882 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1884 DECL_UID (olddecl) = olddecl_uid;
1885 DECL_CONTEXT (olddecl) = olddecl_context;
1888 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1889 so that encode_section_info has a chance to look at the new decl
1890 flags and attributes. */
1891 if (DECL_RTL_SET_P (olddecl)
1892 && (TREE_CODE (olddecl) == FUNCTION_DECL
1893 || (TREE_CODE (olddecl) == VAR_DECL
1894 && TREE_STATIC (olddecl))))
1895 make_decl_rtl (olddecl);
1897 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1898 and the definition is coming from the old version, cgraph needs
1899 to be called again. */
1900 if (extern_changed && !new_is_definition
1901 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1902 cgraph_mark_if_needed (olddecl);
1905 /* Handle when a new declaration NEWDECL has the same name as an old
1906 one OLDDECL in the same binding contour. Prints an error message
1909 If safely possible, alter OLDDECL to look like NEWDECL, and return
1910 true. Otherwise, return false. */
1913 duplicate_decls (tree newdecl, tree olddecl)
1915 tree newtype = NULL, oldtype = NULL;
1917 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1919 /* Avoid `unused variable' and other warnings for OLDDECL. */
1920 TREE_NO_WARNING (olddecl) = 1;
1924 merge_decls (newdecl, olddecl, newtype, oldtype);
1929 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1931 warn_if_shadowing (tree new_decl)
1933 struct c_binding *b;
1935 /* Shadow warnings wanted? */
1937 /* No shadow warnings for internally generated vars. */
1938 || DECL_IS_BUILTIN (new_decl)
1939 /* No shadow warnings for vars made for inlining. */
1940 || DECL_FROM_INLINE (new_decl))
1943 /* Is anything being shadowed? Invisible decls do not count. */
1944 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1945 if (b->decl && b->decl != new_decl && !b->invisible)
1947 tree old_decl = b->decl;
1949 if (old_decl == error_mark_node)
1951 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1952 "non-variable", new_decl);
1955 else if (TREE_CODE (old_decl) == PARM_DECL)
1956 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1958 else if (DECL_FILE_SCOPE_P (old_decl))
1959 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
1960 "declaration", new_decl);
1961 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1962 && DECL_BUILT_IN (old_decl))
1964 warning (OPT_Wshadow, "declaration of %q+D shadows "
1965 "a built-in function", new_decl);
1969 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
1972 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
1979 /* Subroutine of pushdecl.
1981 X is a TYPE_DECL for a typedef statement. Create a brand new
1982 ..._TYPE node (which will be just a variant of the existing
1983 ..._TYPE node with identical properties) and then install X
1984 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1986 The whole point here is to end up with a situation where each
1987 and every ..._TYPE node the compiler creates will be uniquely
1988 associated with AT MOST one node representing a typedef name.
1989 This way, even though the compiler substitutes corresponding
1990 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1991 early on, later parts of the compiler can always do the reverse
1992 translation and get back the corresponding typedef name. For
1995 typedef struct S MY_TYPE;
1998 Later parts of the compiler might only know that `object' was of
1999 type `struct S' if it were not for code just below. With this
2000 code however, later parts of the compiler see something like:
2002 struct S' == struct S
2003 typedef struct S' MY_TYPE;
2006 And they can then deduce (from the node for type struct S') that
2007 the original object declaration was:
2011 Being able to do this is important for proper support of protoize,
2012 and also for generating precise symbolic debugging information
2013 which takes full account of the programmer's (typedef) vocabulary.
2015 Obviously, we don't want to generate a duplicate ..._TYPE node if
2016 the TYPE_DECL node that we are now processing really represents a
2017 standard built-in type. */
2020 clone_underlying_type (tree x)
2022 if (DECL_IS_BUILTIN (x))
2024 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2025 TYPE_NAME (TREE_TYPE (x)) = x;
2027 else if (TREE_TYPE (x) != error_mark_node
2028 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2030 tree tt = TREE_TYPE (x);
2031 DECL_ORIGINAL_TYPE (x) = tt;
2032 tt = build_variant_type_copy (tt);
2034 TREE_USED (tt) = TREE_USED (x);
2039 /* Record a decl-node X as belonging to the current lexical scope.
2040 Check for errors (such as an incompatible declaration for the same
2041 name already seen in the same scope).
2043 Returns either X or an old decl for the same name.
2044 If an old decl is returned, it may have been smashed
2045 to agree with what X says. */
2050 tree name = DECL_NAME (x);
2051 struct c_scope *scope = current_scope;
2052 struct c_binding *b;
2053 bool nested = false;
2055 /* Must set DECL_CONTEXT for everything not at file scope or
2056 DECL_FILE_SCOPE_P won't work. Local externs don't count
2057 unless they have initializers (which generate code). */
2058 if (current_function_decl
2059 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2060 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2061 DECL_CONTEXT (x) = current_function_decl;
2063 /* If this is of variably modified type, prevent jumping into its
2065 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2066 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2067 c_begin_vm_scope (scope->depth);
2069 /* Anonymous decls are just inserted in the scope. */
2072 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2076 /* First, see if there is another declaration with the same name in
2077 the current scope. If there is, duplicate_decls may do all the
2078 work for us. If duplicate_decls returns false, that indicates
2079 two incompatible decls in the same scope; we are to silently
2080 replace the old one (duplicate_decls has issued all appropriate
2081 diagnostics). In particular, we should not consider possible
2082 duplicates in the external scope, or shadowing. */
2083 b = I_SYMBOL_BINDING (name);
2084 if (b && B_IN_SCOPE (b, scope))
2086 struct c_binding *b_ext, *b_use;
2087 tree type = TREE_TYPE (x);
2088 tree visdecl = b->decl;
2089 tree vistype = TREE_TYPE (visdecl);
2090 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2091 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2092 b->inner_comp = false;
2095 /* If this is an external linkage declaration, we should check
2096 for compatibility with the type in the external scope before
2097 setting the type at this scope based on the visible
2098 information only. */
2099 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2101 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2102 b_ext = b_ext->shadowed;
2107 TREE_TYPE (b_use->decl) = b_use->type;
2110 if (duplicate_decls (x, b_use->decl))
2114 /* Save the updated type in the external scope and
2115 restore the proper type for this scope. */
2117 if (comptypes (vistype, type))
2118 thistype = composite_type (vistype, type);
2120 thistype = TREE_TYPE (b_use->decl);
2121 b_use->type = TREE_TYPE (b_use->decl);
2122 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2123 && DECL_BUILT_IN (b_use->decl))
2125 = build_type_attribute_variant (thistype,
2128 TREE_TYPE (b_use->decl) = thistype;
2133 goto skip_external_and_shadow_checks;
2136 /* All declarations with external linkage, and all external
2137 references, go in the external scope, no matter what scope is
2138 current. However, the binding in that scope is ignored for
2139 purposes of normal name lookup. A separate binding structure is
2140 created in the requested scope; this governs the normal
2141 visibility of the symbol.
2143 The binding in the externals scope is used exclusively for
2144 detecting duplicate declarations of the same object, no matter
2145 what scope they are in; this is what we do here. (C99 6.2.7p2:
2146 All declarations that refer to the same object or function shall
2147 have compatible type; otherwise, the behavior is undefined.) */
2148 if (DECL_EXTERNAL (x) || scope == file_scope)
2150 tree type = TREE_TYPE (x);
2153 bool type_saved = false;
2154 if (b && !B_IN_EXTERNAL_SCOPE (b)
2155 && (TREE_CODE (b->decl) == FUNCTION_DECL
2156 || TREE_CODE (b->decl) == VAR_DECL)
2157 && DECL_FILE_SCOPE_P (b->decl))
2160 vistype = TREE_TYPE (visdecl);
2162 if (scope != file_scope
2163 && !DECL_IN_SYSTEM_HEADER (x))
2164 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2166 while (b && !B_IN_EXTERNAL_SCOPE (b))
2168 /* If this decl might be modified, save its type. This is
2169 done here rather than when the decl is first bound
2170 because the type may change after first binding, through
2171 being completed or through attributes being added. If we
2172 encounter multiple such decls, only the first should have
2173 its type saved; the others will already have had their
2174 proper types saved and the types will not have changed as
2175 their scopes will not have been re-entered. */
2176 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2178 b->type = TREE_TYPE (b->decl);
2181 if (B_IN_FILE_SCOPE (b)
2182 && TREE_CODE (b->decl) == VAR_DECL
2183 && TREE_STATIC (b->decl)
2184 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2185 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2186 && TREE_CODE (type) == ARRAY_TYPE
2187 && TYPE_DOMAIN (type)
2188 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2189 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2191 /* Array type completed in inner scope, which should be
2192 diagnosed if the completion does not have size 1 and
2193 it does not get completed in the file scope. */
2194 b->inner_comp = true;
2199 /* If a matching external declaration has been found, set its
2200 type to the composite of all the types of that declaration.
2201 After the consistency checks, it will be reset to the
2202 composite of the visible types only. */
2203 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2205 TREE_TYPE (b->decl) = b->type;
2207 /* The point of the same_translation_unit_p check here is,
2208 we want to detect a duplicate decl for a construct like
2209 foo() { extern bar(); } ... static bar(); but not if
2210 they are in different translation units. In any case,
2211 the static does not go in the externals scope. */
2213 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2214 && duplicate_decls (x, b->decl))
2219 if (comptypes (vistype, type))
2220 thistype = composite_type (vistype, type);
2222 thistype = TREE_TYPE (b->decl);
2226 b->type = TREE_TYPE (b->decl);
2227 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2229 = build_type_attribute_variant (thistype,
2230 TYPE_ATTRIBUTES (b->type));
2231 TREE_TYPE (b->decl) = thistype;
2232 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2235 else if (TREE_PUBLIC (x))
2237 if (visdecl && !b && duplicate_decls (x, visdecl))
2239 /* An external declaration at block scope referring to a
2240 visible entity with internal linkage. The composite
2241 type will already be correct for this scope, so we
2242 just need to fall through to make the declaration in
2249 bind (name, x, external_scope, /*invisible=*/true,
2256 if (TREE_CODE (x) != PARM_DECL)
2257 warn_if_shadowing (x);
2259 skip_external_and_shadow_checks:
2260 if (TREE_CODE (x) == TYPE_DECL)
2261 clone_underlying_type (x);
2263 bind (name, x, scope, /*invisible=*/false, nested);
2265 /* If x's type is incomplete because it's based on a
2266 structure or union which has not yet been fully declared,
2267 attach it to that structure or union type, so we can go
2268 back and complete the variable declaration later, if the
2269 structure or union gets fully declared.
2271 If the input is erroneous, we can have error_mark in the type
2272 slot (e.g. "f(void a, ...)") - that doesn't count as an
2274 if (TREE_TYPE (x) != error_mark_node
2275 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2277 tree element = TREE_TYPE (x);
2279 while (TREE_CODE (element) == ARRAY_TYPE)
2280 element = TREE_TYPE (element);
2281 element = TYPE_MAIN_VARIANT (element);
2283 if ((TREE_CODE (element) == RECORD_TYPE
2284 || TREE_CODE (element) == UNION_TYPE)
2285 && (TREE_CODE (x) != TYPE_DECL
2286 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2287 && !COMPLETE_TYPE_P (element))
2288 C_TYPE_INCOMPLETE_VARS (element)
2289 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2294 /* Record X as belonging to file scope.
2295 This is used only internally by the Objective-C front end,
2296 and is limited to its needs. duplicate_decls is not called;
2297 if there is any preexisting decl for this identifier, it is an ICE. */
2300 pushdecl_top_level (tree x)
2303 bool nested = false;
2304 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2306 name = DECL_NAME (x);
2308 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2310 if (TREE_PUBLIC (x))
2312 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2316 bind (name, x, file_scope, /*invisible=*/false, nested);
2322 implicit_decl_warning (tree id, tree olddecl)
2324 if (warn_implicit_function_declaration)
2329 warned = pedwarn (input_location, OPT_Wimplicit_function_declaration,
2330 "implicit declaration of function %qE", id);
2332 warned = warning (OPT_Wimplicit_function_declaration,
2333 G_("implicit declaration of function %qE"), id);
2334 if (olddecl && warned)
2335 locate_old_decl (olddecl);
2339 /* Generate an implicit declaration for identifier FUNCTIONID as a
2340 function of type int (). */
2343 implicitly_declare (tree functionid)
2345 struct c_binding *b;
2349 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2351 if (B_IN_SCOPE (b, external_scope))
2360 if (decl == error_mark_node)
2363 /* FIXME: Objective-C has weird not-really-builtin functions
2364 which are supposed to be visible automatically. They wind up
2365 in the external scope because they're pushed before the file
2366 scope gets created. Catch this here and rebind them into the
2368 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2370 bind (functionid, decl, file_scope,
2371 /*invisible=*/false, /*nested=*/true);
2376 tree newtype = default_function_type;
2378 TREE_TYPE (decl) = b->type;
2379 /* Implicit declaration of a function already declared
2380 (somehow) in a different scope, or as a built-in.
2381 If this is the first time this has happened, warn;
2382 then recycle the old declaration but with the new type. */
2383 if (!C_DECL_IMPLICIT (decl))
2385 implicit_decl_warning (functionid, decl);
2386 C_DECL_IMPLICIT (decl) = 1;
2388 if (DECL_BUILT_IN (decl))
2390 newtype = build_type_attribute_variant (newtype,
2392 (TREE_TYPE (decl)));
2393 if (!comptypes (newtype, TREE_TYPE (decl)))
2395 warning (0, "incompatible implicit declaration of built-in"
2396 " function %qD", decl);
2397 newtype = TREE_TYPE (decl);
2402 if (!comptypes (newtype, TREE_TYPE (decl)))
2404 error ("incompatible implicit declaration of function %qD",
2406 locate_old_decl (decl);
2409 b->type = TREE_TYPE (decl);
2410 TREE_TYPE (decl) = newtype;
2411 bind (functionid, decl, current_scope,
2412 /*invisible=*/false, /*nested=*/true);
2417 /* Not seen before. */
2418 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2419 DECL_EXTERNAL (decl) = 1;
2420 TREE_PUBLIC (decl) = 1;
2421 C_DECL_IMPLICIT (decl) = 1;
2422 implicit_decl_warning (functionid, 0);
2423 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2425 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2427 /* C89 says implicit declarations are in the innermost block.
2428 So we record the decl in the standard fashion. */
2429 decl = pushdecl (decl);
2431 /* No need to call objc_check_decl here - it's a function type. */
2432 rest_of_decl_compilation (decl, 0, 0);
2434 /* Write a record describing this implicit function declaration
2435 to the prototypes file (if requested). */
2436 gen_aux_info_record (decl, 0, 1, 0);
2438 /* Possibly apply some default attributes to this implicit declaration. */
2439 decl_attributes (&decl, NULL_TREE, 0);
2444 /* Issue an error message for a reference to an undeclared variable
2445 ID, including a reference to a builtin outside of function-call
2446 context. Establish a binding of the identifier to error_mark_node
2447 in an appropriate scope, which will suppress further errors for the
2448 same identifier. The error message should be given location LOC. */
2450 undeclared_variable (tree id, location_t loc)
2452 static bool already = false;
2453 struct c_scope *scope;
2455 if (current_function_decl == 0)
2457 error ("%H%qE undeclared here (not in a function)", &loc, id);
2458 scope = current_scope;
2462 error ("%H%qE undeclared (first use in this function)", &loc, id);
2466 error ("%H(Each undeclared identifier is reported only once", &loc);
2467 error ("%Hfor each function it appears in.)", &loc);
2471 /* If we are parsing old-style parameter decls, current_function_decl
2472 will be nonnull but current_function_scope will be null. */
2473 scope = current_function_scope ? current_function_scope : current_scope;
2475 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2478 /* Subroutine of lookup_label, declare_label, define_label: construct a
2479 LABEL_DECL with all the proper frills. */
2482 make_label (tree name, location_t location)
2484 tree label = build_decl (LABEL_DECL, name, void_type_node);
2486 DECL_CONTEXT (label) = current_function_decl;
2487 DECL_MODE (label) = VOIDmode;
2488 DECL_SOURCE_LOCATION (label) = location;
2493 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2494 Create one if none exists so far for the current function.
2495 This is called when a label is used in a goto expression or
2496 has its address taken. */
2499 lookup_label (tree name)
2503 if (current_function_decl == 0)
2505 error ("label %qE referenced outside of any function", name);
2509 /* Use a label already defined or ref'd with this name, but not if
2510 it is inherited from a containing function and wasn't declared
2512 label = I_LABEL_DECL (name);
2513 if (label && (DECL_CONTEXT (label) == current_function_decl
2514 || C_DECLARED_LABEL_FLAG (label)))
2516 /* If the label has only been declared, update its apparent
2517 location to point here, for better diagnostics if it
2518 turns out not to have been defined. */
2519 if (!TREE_USED (label))
2520 DECL_SOURCE_LOCATION (label) = input_location;
2524 /* No label binding for that identifier; make one. */
2525 label = make_label (name, input_location);
2527 /* Ordinary labels go in the current function scope. */
2528 bind (name, label, current_function_scope,
2529 /*invisible=*/false, /*nested=*/false);
2533 /* Make a label named NAME in the current function, shadowing silently
2534 any that may be inherited from containing functions or containing
2535 scopes. This is called for __label__ declarations. */
2538 declare_label (tree name)
2540 struct c_binding *b = I_LABEL_BINDING (name);
2543 /* Check to make sure that the label hasn't already been declared
2545 if (b && B_IN_CURRENT_SCOPE (b))
2547 error ("duplicate label declaration %qE", name);
2548 locate_old_decl (b->decl);
2550 /* Just use the previous declaration. */
2554 label = make_label (name, input_location);
2555 C_DECLARED_LABEL_FLAG (label) = 1;
2557 /* Declared labels go in the current scope. */
2558 bind (name, label, current_scope,
2559 /*invisible=*/false, /*nested=*/false);
2563 /* Define a label, specifying the location in the source file.
2564 Return the LABEL_DECL node for the label, if the definition is valid.
2565 Otherwise return 0. */
2568 define_label (location_t location, tree name)
2570 /* Find any preexisting label with this name. It is an error
2571 if that label has already been defined in this function, or
2572 if there is a containing function with a declared label with
2574 tree label = I_LABEL_DECL (name);
2575 struct c_label_list *nlist_se, *nlist_vm;
2578 && ((DECL_CONTEXT (label) == current_function_decl
2579 && DECL_INITIAL (label) != 0)
2580 || (DECL_CONTEXT (label) != current_function_decl
2581 && C_DECLARED_LABEL_FLAG (label))))
2583 error ("%Hduplicate label %qD", &location, label);
2584 locate_old_decl (label);
2587 else if (label && DECL_CONTEXT (label) == current_function_decl)
2589 /* The label has been used or declared already in this function,
2590 but not defined. Update its location to point to this
2592 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2593 error ("%Jjump into statement expression", label);
2594 if (C_DECL_UNDEFINABLE_VM (label))
2595 error ("%Jjump into scope of identifier with variably modified type",
2597 DECL_SOURCE_LOCATION (label) = location;
2601 /* No label binding for that identifier; make one. */
2602 label = make_label (name, location);
2604 /* Ordinary labels go in the current function scope. */
2605 bind (name, label, current_function_scope,
2606 /*invisible=*/false, /*nested=*/false);
2609 if (!in_system_header && lookup_name (name))
2610 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2611 "for labels, identifier %qE conflicts", &location, name);
2613 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2614 nlist_se->next = label_context_stack_se->labels_def;
2615 nlist_se->label = label;
2616 label_context_stack_se->labels_def = nlist_se;
2618 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2619 nlist_vm->next = label_context_stack_vm->labels_def;
2620 nlist_vm->label = label;
2621 label_context_stack_vm->labels_def = nlist_vm;
2623 /* Mark label as having been defined. */
2624 DECL_INITIAL (label) = error_mark_node;
2628 /* Given NAME, an IDENTIFIER_NODE,
2629 return the structure (or union or enum) definition for that name.
2630 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2631 CODE says which kind of type the caller wants;
2632 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2633 If the wrong kind of type is found, an error is reported. */
2636 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2638 struct c_binding *b = I_TAG_BINDING (name);
2644 /* We only care about whether it's in this level if
2645 thislevel_only was set or it might be a type clash. */
2646 if (thislevel_only || TREE_CODE (b->decl) != code)
2648 /* For our purposes, a tag in the external scope is the same as
2649 a tag in the file scope. (Primarily relevant to Objective-C
2650 and its builtin structure tags, which get pushed before the
2651 file scope is created.) */
2652 if (B_IN_CURRENT_SCOPE (b)
2653 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2657 if (thislevel_only && !thislevel)
2660 if (TREE_CODE (b->decl) != code)
2662 /* Definition isn't the kind we were looking for. */
2663 pending_invalid_xref = name;
2664 pending_invalid_xref_location = input_location;
2666 /* If in the same binding level as a declaration as a tag
2667 of a different type, this must not be allowed to
2668 shadow that tag, so give the error immediately.
2669 (For example, "struct foo; union foo;" is invalid.) */
2671 pending_xref_error ();
2676 /* Print an error message now
2677 for a recent invalid struct, union or enum cross reference.
2678 We don't print them immediately because they are not invalid
2679 when used in the `struct foo;' construct for shadowing. */
2682 pending_xref_error (void)
2684 if (pending_invalid_xref != 0)
2685 error ("%H%qE defined as wrong kind of tag",
2686 &pending_invalid_xref_location, pending_invalid_xref);
2687 pending_invalid_xref = 0;
2691 /* Look up NAME in the current scope and its superiors
2692 in the namespace of variables, functions and typedefs.
2693 Return a ..._DECL node of some kind representing its definition,
2694 or return 0 if it is undefined. */
2697 lookup_name (tree name)
2699 struct c_binding *b = I_SYMBOL_BINDING (name);
2700 if (b && !b->invisible)
2705 /* Similar to `lookup_name' but look only at the indicated scope. */
2708 lookup_name_in_scope (tree name, struct c_scope *scope)
2710 struct c_binding *b;
2712 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2713 if (B_IN_SCOPE (b, scope))
2718 /* Create the predefined scalar types of C,
2719 and some nodes representing standard constants (0, 1, (void *) 0).
2720 Initialize the global scope.
2721 Make definitions for built-in primitive functions. */
2724 c_init_decl_processing (void)
2726 location_t save_loc = input_location;
2728 /* Initialize reserved words for parser. */
2731 current_function_decl = 0;
2733 gcc_obstack_init (&parser_obstack);
2735 /* Make the externals scope. */
2737 external_scope = current_scope;
2739 /* Declarations from c_common_nodes_and_builtins must not be associated
2740 with this input file, lest we get differences between using and not
2741 using preprocessed headers. */
2742 input_location = BUILTINS_LOCATION;
2744 build_common_tree_nodes (flag_signed_char, false);
2746 c_common_nodes_and_builtins ();
2748 /* In C, comparisons and TRUTH_* expressions have type int. */
2749 truthvalue_type_node = integer_type_node;
2750 truthvalue_true_node = integer_one_node;
2751 truthvalue_false_node = integer_zero_node;
2753 /* Even in C99, which has a real boolean type. */
2754 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2755 boolean_type_node));
2757 input_location = save_loc;
2759 pedantic_lvalues = true;
2761 make_fname_decl = c_make_fname_decl;
2762 start_fname_decls ();
2765 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2766 decl, NAME is the initialization string and TYPE_DEP indicates whether
2767 NAME depended on the type of the function. As we don't yet implement
2768 delayed emission of static data, we mark the decl as emitted
2769 so it is not placed in the output. Anything using it must therefore pull
2770 out the STRING_CST initializer directly. FIXME. */
2773 c_make_fname_decl (tree id, int type_dep)
2775 const char *name = fname_as_string (type_dep);
2776 tree decl, type, init;
2777 size_t length = strlen (name);
2779 type = build_array_type (char_type_node,
2780 build_index_type (size_int (length)));
2781 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2783 decl = build_decl (VAR_DECL, id, type);
2785 TREE_STATIC (decl) = 1;
2786 TREE_READONLY (decl) = 1;
2787 DECL_ARTIFICIAL (decl) = 1;
2789 init = build_string (length + 1, name);
2790 free (CONST_CAST (char *, name));
2791 TREE_TYPE (init) = type;
2792 DECL_INITIAL (decl) = init;
2794 TREE_USED (decl) = 1;
2796 if (current_function_decl
2797 /* For invalid programs like this:
2800 const char* p = __FUNCTION__;
2802 the __FUNCTION__ is believed to appear in K&R style function
2803 parameter declarator. In that case we still don't have
2805 && (!errorcount || current_function_scope))
2807 DECL_CONTEXT (decl) = current_function_decl;
2808 bind (id, decl, current_function_scope,
2809 /*invisible=*/false, /*nested=*/false);
2812 finish_decl (decl, init, NULL_TREE);
2818 c_builtin_function (tree decl)
2820 tree type = TREE_TYPE (decl);
2821 tree id = DECL_NAME (decl);
2823 const char *name = IDENTIFIER_POINTER (id);
2824 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2826 /* Should never be called on a symbol with a preexisting meaning. */
2827 gcc_assert (!I_SYMBOL_BINDING (id));
2829 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2831 /* Builtins in the implementation namespace are made visible without
2832 needing to be explicitly declared. See push_file_scope. */
2833 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2835 TREE_CHAIN (decl) = visible_builtins;
2836 visible_builtins = decl;
2843 c_builtin_function_ext_scope (tree decl)
2845 tree type = TREE_TYPE (decl);
2846 tree id = DECL_NAME (decl);
2848 const char *name = IDENTIFIER_POINTER (id);
2849 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2851 /* Should never be called on a symbol with a preexisting meaning. */
2852 gcc_assert (!I_SYMBOL_BINDING (id));
2854 bind (id, decl, external_scope, /*invisible=*/false, /*nested=*/false);
2856 /* Builtins in the implementation namespace are made visible without
2857 needing to be explicitly declared. See push_file_scope. */
2858 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2860 TREE_CHAIN (decl) = visible_builtins;
2861 visible_builtins = decl;
2867 /* Called when a declaration is seen that contains no names to declare.
2868 If its type is a reference to a structure, union or enum inherited
2869 from a containing scope, shadow that tag name for the current scope
2870 with a forward reference.
2871 If its type defines a new named structure or union
2872 or defines an enum, it is valid but we need not do anything here.
2873 Otherwise, it is an error. */
2876 shadow_tag (const struct c_declspecs *declspecs)
2878 shadow_tag_warned (declspecs, 0);
2881 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2884 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2886 bool found_tag = false;
2888 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2890 tree value = declspecs->type;
2891 enum tree_code code = TREE_CODE (value);
2893 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2894 /* Used to test also that TYPE_SIZE (value) != 0.
2895 That caused warning for `struct foo;' at top level in the file. */
2897 tree name = TYPE_NAME (value);
2904 if (warned != 1 && code != ENUMERAL_TYPE)
2905 /* Empty unnamed enum OK */
2907 pedwarn (input_location, 0,
2908 "unnamed struct/union that defines no instances");
2912 else if (!declspecs->tag_defined_p
2913 && declspecs->storage_class != csc_none)
2916 pedwarn (input_location, 0,
2917 "empty declaration with storage class specifier "
2918 "does not redeclare tag");
2920 pending_xref_error ();
2922 else if (!declspecs->tag_defined_p
2923 && (declspecs->const_p
2924 || declspecs->volatile_p
2925 || declspecs->restrict_p))
2928 pedwarn (input_location, 0,
2929 "empty declaration with type qualifier "
2930 "does not redeclare tag");
2932 pending_xref_error ();
2936 pending_invalid_xref = 0;
2937 t = lookup_tag (code, name, 1);
2941 t = make_node (code);
2948 if (warned != 1 && !in_system_header)
2950 pedwarn (input_location, 0,
2951 "useless type name in empty declaration");
2956 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2958 pedwarn (input_location, 0, "useless type name in empty declaration");
2962 pending_invalid_xref = 0;
2964 if (declspecs->inline_p)
2966 error ("%<inline%> in empty declaration");
2970 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2972 error ("%<auto%> in file-scope empty declaration");
2976 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2978 error ("%<register%> in file-scope empty declaration");
2982 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2984 warning (0, "useless storage class specifier in empty declaration");
2988 if (!warned && !in_system_header && declspecs->thread_p)
2990 warning (0, "useless %<__thread%> in empty declaration");
2994 if (!warned && !in_system_header && (declspecs->const_p
2995 || declspecs->volatile_p
2996 || declspecs->restrict_p))
2998 warning (0, "useless type qualifier in empty declaration");
3005 pedwarn (input_location, 0, "empty declaration");
3010 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3011 bits. SPECS represents declaration specifiers that the grammar
3012 only permits to contain type qualifiers and attributes. */
3015 quals_from_declspecs (const struct c_declspecs *specs)
3017 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3018 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3019 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3020 gcc_assert (!specs->type
3021 && !specs->decl_attr
3022 && specs->typespec_word == cts_none
3023 && specs->storage_class == csc_none
3024 && !specs->typedef_p
3025 && !specs->explicit_signed_p
3026 && !specs->deprecated_p
3028 && !specs->long_long_p
3031 && !specs->unsigned_p
3032 && !specs->complex_p
3034 && !specs->thread_p);
3038 /* Construct an array declarator. EXPR is the expression inside [],
3039 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3040 applied to the pointer to which a parameter array is converted).
3041 STATIC_P is true if "static" is inside the [], false otherwise.
3042 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3043 length which is nevertheless a complete type, false otherwise. The
3044 field for the contained declarator is left to be filled in by
3045 set_array_declarator_inner. */
3047 struct c_declarator *
3048 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3051 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3052 struct c_declarator);
3053 declarator->kind = cdk_array;
3054 declarator->declarator = 0;
3055 declarator->u.array.dimen = expr;
3058 declarator->u.array.attrs = quals->attrs;
3059 declarator->u.array.quals = quals_from_declspecs (quals);
3063 declarator->u.array.attrs = NULL_TREE;
3064 declarator->u.array.quals = 0;
3066 declarator->u.array.static_p = static_p;
3067 declarator->u.array.vla_unspec_p = vla_unspec_p;
3070 if (static_p || quals != NULL)
3071 pedwarn (input_location, OPT_pedantic,
3072 "ISO C90 does not support %<static%> or type "
3073 "qualifiers in parameter array declarators");
3075 pedwarn (input_location, OPT_pedantic,
3076 "ISO C90 does not support %<[*]%> array declarators");
3080 if (!current_scope->parm_flag)
3083 error ("%<[*]%> not allowed in other than function prototype scope");
3084 declarator->u.array.vla_unspec_p = false;
3087 current_scope->had_vla_unspec = true;
3092 /* Set the contained declarator of an array declarator. DECL is the
3093 declarator, as constructed by build_array_declarator; INNER is what
3094 appears on the left of the []. */
3096 struct c_declarator *
3097 set_array_declarator_inner (struct c_declarator *decl,
3098 struct c_declarator *inner)
3100 decl->declarator = inner;
3104 /* INIT is a constructor that forms DECL's initializer. If the final
3105 element initializes a flexible array field, add the size of that
3106 initializer to DECL's size. */
3109 add_flexible_array_elts_to_size (tree decl, tree init)
3113 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3116 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3117 type = TREE_TYPE (elt);
3118 if (TREE_CODE (type) == ARRAY_TYPE
3119 && TYPE_SIZE (type) == NULL_TREE
3120 && TYPE_DOMAIN (type) != NULL_TREE
3121 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3123 complete_array_type (&type, elt, false);
3125 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3126 DECL_SIZE_UNIT (decl)
3127 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3131 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3134 groktypename (struct c_type_name *type_name)
3137 tree attrs = type_name->specs->attrs;
3139 type_name->specs->attrs = NULL_TREE;
3141 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3142 false, NULL, &attrs, DEPRECATED_NORMAL);
3144 /* Apply attributes. */
3145 decl_attributes (&type, attrs, 0);
3150 /* Decode a declarator in an ordinary declaration or data definition.
3151 This is called as soon as the type information and variable name
3152 have been parsed, before parsing the initializer if any.
3153 Here we create the ..._DECL node, fill in its type,
3154 and put it on the list of decls for the current context.
3155 The ..._DECL node is returned as the value.
3157 Exception: for arrays where the length is not specified,
3158 the type is left null, to be filled in by `finish_decl'.
3160 Function definitions do not come here; they go to start_function
3161 instead. However, external and forward declarations of functions
3162 do go through here. Structure field declarations are done by
3163 grokfield and not through here. */
3166 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3167 bool initialized, tree attributes)
3171 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
3173 /* An object declared as __attribute__((deprecated)) suppresses
3174 warnings of uses of other deprecated items. */
3175 if (lookup_attribute ("deprecated", attributes))
3176 deprecated_state = DEPRECATED_SUPPRESS;
3178 decl = grokdeclarator (declarator, declspecs,
3179 NORMAL, initialized, NULL, &attributes,
3184 if (TREE_CODE (decl) != FUNCTION_DECL && MAIN_NAME_P (DECL_NAME (decl)))
3185 warning (OPT_Wmain, "%q+D is usually a function", decl);
3188 /* Is it valid for this decl to have an initializer at all?
3189 If not, set INITIALIZED to zero, which will indirectly
3190 tell 'finish_decl' to ignore the initializer once it is parsed. */
3191 switch (TREE_CODE (decl))
3194 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3199 error ("function %qD is initialized like a variable", decl);
3204 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3205 error ("parameter %qD is initialized", decl);
3210 /* Don't allow initializations for incomplete types except for
3211 arrays which might be completed by the initialization. */
3213 /* This can happen if the array size is an undefined macro.
3214 We already gave a warning, so we don't need another one. */
3215 if (TREE_TYPE (decl) == error_mark_node)
3217 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3219 /* A complete type is ok if size is fixed. */
3221 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3222 || C_DECL_VARIABLE_SIZE (decl))
3224 error ("variable-sized object may not be initialized");
3228 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3230 error ("variable %qD has initializer but incomplete type", decl);
3233 else if (C_DECL_VARIABLE_SIZE (decl))
3235 /* Although C99 is unclear about whether incomplete arrays
3236 of VLAs themselves count as VLAs, it does not make
3237 sense to permit them to be initialized given that
3238 ordinary VLAs may not be initialized. */
3239 error ("variable-sized object may not be initialized");
3246 if (current_scope == file_scope)
3247 TREE_STATIC (decl) = 1;
3249 /* Tell 'pushdecl' this is an initialized decl
3250 even though we don't yet have the initializer expression.
3251 Also tell 'finish_decl' it may store the real initializer. */
3252 DECL_INITIAL (decl) = error_mark_node;
3255 /* If this is a function declaration, write a record describing it to the
3256 prototypes file (if requested). */
3258 if (TREE_CODE (decl) == FUNCTION_DECL)
3259 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3261 /* ANSI specifies that a tentative definition which is not merged with
3262 a non-tentative definition behaves exactly like a definition with an
3263 initializer equal to zero. (Section 3.7.2)
3265 -fno-common gives strict ANSI behavior, though this tends to break
3266 a large body of code that grew up without this rule.
3268 Thread-local variables are never common, since there's no entrenched
3269 body of code to break, and it allows more efficient variable references
3270 in the presence of dynamic linking. */
3272 if (TREE_CODE (decl) == VAR_DECL
3274 && TREE_PUBLIC (decl)
3275 && !DECL_THREAD_LOCAL_P (decl)
3277 DECL_COMMON (decl) = 1;
3279 /* Set attributes here so if duplicate decl, will have proper attributes. */
3280 decl_attributes (&decl, attributes, 0);
3282 /* Handle gnu_inline attribute. */
3283 if (declspecs->inline_p
3284 && !flag_gnu89_inline
3285 && TREE_CODE (decl) == FUNCTION_DECL
3286 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))
3287 || current_function_decl))
3289 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3291 else if (declspecs->storage_class != csc_static)
3292 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3295 if (TREE_CODE (decl) == FUNCTION_DECL
3296 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3298 struct c_declarator *ce = declarator;
3300 if (ce->kind == cdk_pointer)
3301 ce = declarator->declarator;
3302 if (ce->kind == cdk_function)
3304 tree args = ce->u.arg_info->parms;
3305 for (; args; args = TREE_CHAIN (args))
3307 tree type = TREE_TYPE (args);
3308 if (type && INTEGRAL_TYPE_P (type)
3309 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3310 DECL_ARG_TYPE (args) = integer_type_node;
3315 if (TREE_CODE (decl) == FUNCTION_DECL
3316 && DECL_DECLARED_INLINE_P (decl)
3317 && DECL_UNINLINABLE (decl)
3318 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3319 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3322 /* C99 6.7.4p3: An inline definition of a function with external
3323 linkage shall not contain a definition of a modifiable object
3324 with static storage duration... */
3325 if (TREE_CODE (decl) == VAR_DECL
3326 && current_scope != file_scope
3327 && TREE_STATIC (decl)
3328 && !TREE_READONLY (decl)
3329 && DECL_DECLARED_INLINE_P (current_function_decl)
3330 && DECL_EXTERNAL (current_function_decl))
3331 pedwarn (input_location, 0,
3332 "%q+D is static but declared in inline function %qD "
3333 "which is not static", decl, current_function_decl);
3335 /* Add this decl to the current scope.
3336 TEM may equal DECL or it may be a previous decl of the same name. */
3337 tem = pushdecl (decl);
3339 if (initialized && DECL_EXTERNAL (tem))
3341 DECL_EXTERNAL (tem) = 0;
3342 TREE_STATIC (tem) = 1;
3348 /* Initialize EH if not initialized yet and exceptions are enabled. */
3351 c_maybe_initialize_eh (void)
3353 if (!flag_exceptions || c_eh_initialized_p)
3356 c_eh_initialized_p = true;
3357 eh_personality_libfunc
3358 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3359 ? "__gcc_personality_sj0"
3360 : "__gcc_personality_v0");
3361 default_init_unwind_resume_libfunc ();
3362 using_eh_for_cleanups ();
3365 /* Finish processing of a declaration;
3366 install its initial value.
3367 If the length of an array type is not known before,
3368 it must be determined now, from the initial value, or it is an error. */
3371 finish_decl (tree decl, tree init, tree asmspec_tree)
3374 int was_incomplete = (DECL_SIZE (decl) == 0);
3375 const char *asmspec = 0;
3377 /* If a name was specified, get the string. */
3378 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3379 && DECL_FILE_SCOPE_P (decl))
3380 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3382 asmspec = TREE_STRING_POINTER (asmspec_tree);
3384 if (TREE_CODE (decl) == VAR_DECL
3385 && TREE_STATIC (decl)
3386 && global_bindings_p ())
3387 /* So decl is a global variable. Record the types it uses
3388 so that we can decide later to emit debug info for them. */
3389 record_types_used_by_current_var_decl (decl);
3391 /* If `start_decl' didn't like having an initialization, ignore it now. */
3392 if (init != 0 && DECL_INITIAL (decl) == 0)
3395 /* Don't crash if parm is initialized. */
3396 if (TREE_CODE (decl) == PARM_DECL)
3400 store_init_value (decl, init);
3402 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3403 || TREE_CODE (decl) == FUNCTION_DECL
3404 || TREE_CODE (decl) == FIELD_DECL))
3405 objc_check_decl (decl);
3407 type = TREE_TYPE (decl);
3409 /* Deduce size of array from initialization, if not already known. */
3410 if (TREE_CODE (type) == ARRAY_TYPE
3411 && TYPE_DOMAIN (type) == 0
3412 && TREE_CODE (decl) != TYPE_DECL)
3415 = (TREE_STATIC (decl)
3416 /* Even if pedantic, an external linkage array
3417 may have incomplete type at first. */
3418 ? pedantic && !TREE_PUBLIC (decl)
3419 : !DECL_EXTERNAL (decl));
3421 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3424 /* Get the completed type made by complete_array_type. */
3425 type = TREE_TYPE (decl);
3430 error ("initializer fails to determine size of %q+D", decl);
3435 error ("array size missing in %q+D", decl);
3436 /* If a `static' var's size isn't known,
3437 make it extern as well as static, so it does not get
3439 If it is not `static', then do not mark extern;
3440 finish_incomplete_decl will give it a default size
3441 and it will get allocated. */
3442 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3443 DECL_EXTERNAL (decl) = 1;
3447 error ("zero or negative size array %q+D", decl);
3451 /* For global variables, update the copy of the type that
3452 exists in the binding. */
3453 if (TREE_PUBLIC (decl))
3455 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3456 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3457 b_ext = b_ext->shadowed;
3461 b_ext->type = composite_type (b_ext->type, type);
3472 if (DECL_INITIAL (decl))
3473 TREE_TYPE (DECL_INITIAL (decl)) = type;
3475 layout_decl (decl, 0);
3478 if (TREE_CODE (decl) == VAR_DECL)
3480 if (init && TREE_CODE (init) == CONSTRUCTOR)
3481 add_flexible_array_elts_to_size (decl, init);
3483 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3484 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3485 layout_decl (decl, 0);
3487 if (DECL_SIZE (decl) == 0
3488 /* Don't give an error if we already gave one earlier. */
3489 && TREE_TYPE (decl) != error_mark_node
3490 && (TREE_STATIC (decl)
3491 /* A static variable with an incomplete type
3492 is an error if it is initialized.
3493 Also if it is not file scope.
3494 Otherwise, let it through, but if it is not `extern'
3495 then it may cause an error message later. */
3496 ? (DECL_INITIAL (decl) != 0
3497 || !DECL_FILE_SCOPE_P (decl))
3498 /* An automatic variable with an incomplete type
3500 : !DECL_EXTERNAL (decl)))
3502 error ("storage size of %q+D isn%'t known", decl);
3503 TREE_TYPE (decl) = error_mark_node;
3506 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3507 && DECL_SIZE (decl) != 0)
3509 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3510 constant_expression_warning (DECL_SIZE (decl));
3513 error ("storage size of %q+D isn%'t constant", decl);
3514 TREE_TYPE (decl) = error_mark_node;
3518 if (TREE_USED (type))
3519 TREE_USED (decl) = 1;
3522 /* If this is a function and an assembler name is specified, reset DECL_RTL
3523 so we can give it its new name. Also, update built_in_decls if it
3524 was a normal built-in. */
3525 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3527 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3528 set_builtin_user_assembler_name (decl, asmspec);
3529 set_user_assembler_name (decl, asmspec);
3532 /* If #pragma weak was used, mark the decl weak now. */
3533 maybe_apply_pragma_weak (decl);
3535 /* Output the assembler code and/or RTL code for variables and functions,
3536 unless the type is an undefined structure or union.
3537 If not, it will get done when the type is completed. */
3539 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3541 /* Determine the ELF visibility. */
3542 if (TREE_PUBLIC (decl))
3543 c_determine_visibility (decl);
3545 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3546 if (c_dialect_objc ())
3547 objc_check_decl (decl);
3551 /* If this is not a static variable, issue a warning.
3552 It doesn't make any sense to give an ASMSPEC for an
3553 ordinary, non-register local variable. Historically,
3554 GCC has accepted -- but ignored -- the ASMSPEC in
3556 if (!DECL_FILE_SCOPE_P (decl)
3557 && TREE_CODE (decl) == VAR_DECL
3558 && !C_DECL_REGISTER (decl)
3559 && !TREE_STATIC (decl))
3560 warning (0, "ignoring asm-specifier for non-static local "
3561 "variable %q+D", decl);
3563 set_user_assembler_name (decl, asmspec);
3566 if (DECL_FILE_SCOPE_P (decl))
3568 if (DECL_INITIAL (decl) == NULL_TREE
3569 || DECL_INITIAL (decl) == error_mark_node)
3570 /* Don't output anything
3571 when a tentative file-scope definition is seen.
3572 But at end of compilation, do output code for them. */
3573 DECL_DEFER_OUTPUT (decl) = 1;
3574 rest_of_decl_compilation (decl, true, 0);
3578 /* In conjunction with an ASMSPEC, the `register'
3579 keyword indicates that we should place the variable
3580 in a particular register. */
3581 if (asmspec && C_DECL_REGISTER (decl))
3583 DECL_HARD_REGISTER (decl) = 1;
3584 /* This cannot be done for a structure with volatile
3585 fields, on which DECL_REGISTER will have been
3587 if (!DECL_REGISTER (decl))
3588 error ("cannot put object with volatile field into register");
3591 if (TREE_CODE (decl) != FUNCTION_DECL)
3593 /* If we're building a variable sized type, and we might be
3594 reachable other than via the top of the current binding
3595 level, then create a new BIND_EXPR so that we deallocate
3596 the object at the right time. */
3597 /* Note that DECL_SIZE can be null due to errors. */
3598 if (DECL_SIZE (decl)
3599 && !TREE_CONSTANT (DECL_SIZE (decl))
3600 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3603 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3604 TREE_SIDE_EFFECTS (bind) = 1;
3606 BIND_EXPR_BODY (bind) = push_stmt_list ();
3608 add_stmt (build_stmt (DECL_EXPR, decl));
3613 if (!DECL_FILE_SCOPE_P (decl))
3615 /* Recompute the RTL of a local array now
3616 if it used to be an incomplete type. */
3618 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3620 /* If we used it already as memory, it must stay in memory. */
3621 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3622 /* If it's still incomplete now, no init will save it. */
3623 if (DECL_SIZE (decl) == 0)
3624 DECL_INITIAL (decl) = 0;
3629 if (TREE_CODE (decl) == TYPE_DECL)
3631 if (!DECL_FILE_SCOPE_P (decl)
3632 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3633 add_stmt (build_stmt (DECL_EXPR, decl));
3635 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3638 /* At the end of a declaration, throw away any variable type sizes
3639 of types defined inside that declaration. There is no use
3640 computing them in the following function definition. */
3641 if (current_scope == file_scope)
3642 get_pending_sizes ();
3644 /* Install a cleanup (aka destructor) if one was given. */
3645 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3647 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3650 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3651 tree cleanup_decl = lookup_name (cleanup_id);
3654 /* Build "cleanup(&decl)" for the destructor. */
3655 cleanup = build_unary_op (input_location, ADDR_EXPR, decl, 0);
3656 cleanup = build_tree_list (NULL_TREE, cleanup);
3657 cleanup = build_function_call (cleanup_decl, cleanup);
3659 /* Don't warn about decl unused; the cleanup uses it. */
3660 TREE_USED (decl) = 1;
3661 TREE_USED (cleanup_decl) = 1;
3663 /* Initialize EH, if we've been told to do so. */
3664 c_maybe_initialize_eh ();
3666 push_cleanup (decl, cleanup, false);
3671 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3674 grokparm (const struct c_parm *parm)
3676 tree attrs = parm->attrs;
3677 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3678 NULL, &attrs, DEPRECATED_NORMAL);
3680 decl_attributes (&decl, attrs, 0);
3685 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3686 and push that on the current scope. */
3689 push_parm_decl (const struct c_parm *parm)
3691 tree attrs = parm->attrs;
3694 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL,
3695 &attrs, DEPRECATED_NORMAL);
3696 decl_attributes (&decl, attrs, 0);
3698 decl = pushdecl (decl);
3700 finish_decl (decl, NULL_TREE, NULL_TREE);
3703 /* Mark all the parameter declarations to date as forward decls.
3704 Also diagnose use of this extension. */
3707 mark_forward_parm_decls (void)
3709 struct c_binding *b;
3711 if (pedantic && !current_scope->warned_forward_parm_decls)
3713 pedwarn (input_location, OPT_pedantic,
3714 "ISO C forbids forward parameter declarations");
3715 current_scope->warned_forward_parm_decls = true;
3718 for (b = current_scope->bindings; b; b = b->prev)
3719 if (TREE_CODE (b->decl) == PARM_DECL)
3720 TREE_ASM_WRITTEN (b->decl) = 1;
3723 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3724 literal, which may be an incomplete array type completed by the
3725 initializer; INIT is a CONSTRUCTOR that initializes the compound
3729 build_compound_literal (tree type, tree init)
3731 /* We do not use start_decl here because we have a type, not a declarator;
3732 and do not use finish_decl because the decl should be stored inside
3733 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3738 if (type == error_mark_node
3739 || init == error_mark_node)
3740 return error_mark_node;
3742 decl = build_decl (VAR_DECL, NULL_TREE, type);
3743 DECL_EXTERNAL (decl) = 0;
3744 TREE_PUBLIC (decl) = 0;
3745 TREE_STATIC (decl) = (current_scope == file_scope);
3746 DECL_CONTEXT (decl) = current_function_decl;
3747 TREE_USED (decl) = 1;
3748 TREE_TYPE (decl) = type;
3749 TREE_READONLY (decl) = TYPE_READONLY (type);
3750 store_init_value (decl, init);
3752 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3754 int failure = complete_array_type (&TREE_TYPE (decl),
3755 DECL_INITIAL (decl), true);
3756 gcc_assert (!failure);
3758 type = TREE_TYPE (decl);
3759 TREE_TYPE (DECL_INITIAL (decl)) = type;
3762 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3763 return error_mark_node;
3765 stmt = build_stmt (DECL_EXPR, decl);
3766 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3767 TREE_SIDE_EFFECTS (complit) = 1;
3769 layout_decl (decl, 0);
3771 if (TREE_STATIC (decl))
3773 /* This decl needs a name for the assembler output. */
3774 set_compound_literal_name (decl);
3775 DECL_DEFER_OUTPUT (decl) = 1;
3776 DECL_COMDAT (decl) = 1;
3777 DECL_ARTIFICIAL (decl) = 1;
3778 DECL_IGNORED_P (decl) = 1;
3780 rest_of_decl_compilation (decl, 1, 0);
3786 /* Determine whether TYPE is a structure with a flexible array member,
3787 or a union containing such a structure (possibly recursively). */
3790 flexible_array_type_p (tree type)
3793 switch (TREE_CODE (type))
3796 x = TYPE_FIELDS (type);
3799 while (TREE_CHAIN (x) != NULL_TREE)
3801 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3802 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3803 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3804 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3808 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3810 if (flexible_array_type_p (TREE_TYPE (x)))
3819 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3820 replacing with appropriate values if they are invalid. */
3822 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3825 unsigned int max_width;
3826 unsigned HOST_WIDE_INT w;
3827 const char *name = orig_name ? orig_name: _("<anonymous>");
3829 /* Detect and ignore out of range field width and process valid
3831 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3832 || TREE_CODE (*width) != INTEGER_CST)
3834 error ("bit-field %qs width not an integer constant", name);
3835 *width = integer_one_node;
3839 constant_expression_warning (*width);
3840 if (tree_int_cst_sgn (*width) < 0)
3842 error ("negative width in bit-field %qs", name);
3843 *width = integer_one_node;
3845 else if (integer_zerop (*width) && orig_name)
3847 error ("zero width for bit-field %qs", name);
3848 *width = integer_one_node;
3852 /* Detect invalid bit-field type. */
3853 if (TREE_CODE (*type) != INTEGER_TYPE
3854 && TREE_CODE (*type) != BOOLEAN_TYPE
3855 && TREE_CODE (*type) != ENUMERAL_TYPE)
3857 error ("bit-field %qs has invalid type", name);
3858 *type = unsigned_type_node;
3861 type_mv = TYPE_MAIN_VARIANT (*type);
3862 if (!in_system_header
3863 && type_mv != integer_type_node
3864 && type_mv != unsigned_type_node
3865 && type_mv != boolean_type_node)
3866 pedwarn (input_location, OPT_pedantic,
3867 "type of bit-field %qs is a GCC extension", name);
3869 max_width = TYPE_PRECISION (*type);
3871 if (0 < compare_tree_int (*width, max_width))
3873 error ("width of %qs exceeds its type", name);
3875 *width = build_int_cst (NULL_TREE, w);
3878 w = tree_low_cst (*width, 1);
3880 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3882 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3884 || w < tree_int_cst_min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3885 || w < tree_int_cst_min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3886 warning (0, "%qs is narrower than values of its type", name);
3892 /* Print warning about variable length array if necessary. */
3895 warn_variable_length_array (const char *name, tree size)
3897 int const_size = TREE_CONSTANT (size);
3899 if (!flag_isoc99 && pedantic && warn_vla != 0)
3904 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array %qs whose size "
3905 "can%'t be evaluated",
3908 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
3909 "can%'t be evaluated");
3914 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array %qs",
3917 pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
3920 else if (warn_vla > 0)
3926 "the size of array %qs can"
3927 "%'t be evaluated", name);
3930 "the size of array can %'t be evaluated");
3936 "variable length array %qs is used",
3940 "variable length array is used");
3945 /* Given declspecs and a declarator,
3946 determine the name and type of the object declared
3947 and construct a ..._DECL node for it.
3948 (In one case we can return a ..._TYPE node instead.
3949 For invalid input we sometimes return 0.)
3951 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3953 DECL_CONTEXT says which syntactic context this declaration is in:
3954 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3955 FUNCDEF for a function definition. Like NORMAL but a few different
3956 error messages in each case. Return value may be zero meaning
3957 this definition is too screwy to try to parse.
3958 PARM for a parameter declaration (either within a function prototype
3959 or before a function body). Make a PARM_DECL, or return void_type_node.
3960 TYPENAME if for a typename (in a cast or sizeof).
3961 Don't make a DECL node; just return the ..._TYPE node.
3962 FIELD for a struct or union field; make a FIELD_DECL.
3963 INITIALIZED is true if the decl has an initializer.
3964 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3965 representing the width of the bit-field.
3966 DECL_ATTRS points to the list of attributes that should be added to this
3967 decl. Any nested attributes that belong on the decl itself will be
3969 DEPRECATED_STATE is a deprecated_states value indicating whether
3970 deprecation warnings should be suppressed.
3972 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3973 It may also be so in the PARM case, for a prototype where the
3974 argument type is specified but not the name.
3976 This function is where the complicated C meanings of `static'
3977 and `extern' are interpreted. */
3980 grokdeclarator (const struct c_declarator *declarator,
3981 struct c_declspecs *declspecs,
3982 enum decl_context decl_context, bool initialized, tree *width,
3983 tree *decl_attrs, enum deprecated_states deprecated_state)
3985 tree type = declspecs->type;
3986 bool threadp = declspecs->thread_p;
3987 enum c_storage_class storage_class = declspecs->storage_class;
3991 int type_quals = TYPE_UNQUALIFIED;
3992 const char *name, *orig_name;
3993 bool funcdef_flag = false;
3994 bool funcdef_syntax = false;
3995 int size_varies = 0;
3996 tree decl_attr = declspecs->decl_attr;
3997 int array_ptr_quals = TYPE_UNQUALIFIED;
3998 tree array_ptr_attrs = NULL_TREE;
3999 int array_parm_static = 0;
4000 bool array_parm_vla_unspec_p = false;
4001 tree returned_attrs = NULL_TREE;
4002 bool bitfield = width != NULL;
4004 struct c_arg_info *arg_info = 0;
4006 if (decl_context == FUNCDEF)
4007 funcdef_flag = true, decl_context = NORMAL;
4009 /* Look inside a declarator for the name being declared
4010 and get it as a string, for an error message. */
4012 const struct c_declarator *decl = declarator;
4021 funcdef_syntax = (decl->kind == cdk_function);
4022 decl = decl->declarator;
4026 decl = decl->declarator;
4031 name = IDENTIFIER_POINTER (decl->u.id);
4043 /* A function definition's declarator must have the form of
4044 a function declarator. */
4046 if (funcdef_flag && !funcdef_syntax)
4049 /* If this looks like a function definition, make it one,
4050 even if it occurs where parms are expected.
4051 Then store_parm_decls will reject it and not use it as a parm. */
4052 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4053 decl_context = PARM;
4055 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4056 warn_deprecated_use (declspecs->type);
4058 if ((decl_context == NORMAL || decl_context == FIELD)
4059 && current_scope == file_scope
4060 && variably_modified_type_p (type, NULL_TREE))
4062 error ("variably modified %qs at file scope", name);
4063 type = integer_type_node;
4066 size_varies = C_TYPE_VARIABLE_SIZE (type);
4068 /* Diagnose defaulting to "int". */
4070 if (declspecs->default_int_p && !in_system_header)
4072 /* Issue a warning if this is an ISO C 99 program or if
4073 -Wreturn-type and this is a function, or if -Wimplicit;
4074 prefer the former warning since it is more explicit. */
4075 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4077 warn_about_return_type = 1;
4079 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wimplicit_int,
4080 "type defaults to %<int%> in declaration of %qs", name);
4083 /* Adjust the type if a bit-field is being declared,
4084 -funsigned-bitfields applied and the type is not explicitly
4086 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4087 && TREE_CODE (type) == INTEGER_TYPE)
4088 type = unsigned_type_for (type);
4090 /* Figure out the type qualifiers for the declaration. There are
4091 two ways a declaration can become qualified. One is something
4092 like `const int i' where the `const' is explicit. Another is
4093 something like `typedef const int CI; CI i' where the type of the
4094 declaration contains the `const'. A third possibility is that
4095 there is a type qualifier on the element type of a typedefed
4096 array type, in which case we should extract that qualifier so
4097 that c_apply_type_quals_to_decl receives the full list of
4098 qualifiers to work with (C90 is not entirely clear about whether
4099 duplicate qualifiers should be diagnosed in this case, but it
4100 seems most appropriate to do so). */
4101 element_type = strip_array_types (type);
4102 constp = declspecs->const_p + TYPE_READONLY (element_type);
4103 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4104 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4105 if (pedantic && !flag_isoc99)
4108 pedwarn (input_location, OPT_pedantic, "duplicate %<const%>");
4110 pedwarn (input_location, OPT_pedantic, "duplicate %<restrict%>");
4112 pedwarn (input_location, OPT_pedantic, "duplicate %<volatile%>");
4114 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4115 type = TYPE_MAIN_VARIANT (type);
4116 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4117 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4118 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4120 /* Warn about storage classes that are invalid for certain
4121 kinds of declarations (parameters, typenames, etc.). */
4125 || storage_class == csc_auto
4126 || storage_class == csc_register
4127 || storage_class == csc_typedef))
4129 if (storage_class == csc_auto)
4130 pedwarn (input_location,
4131 (current_scope == file_scope) ? 0 : OPT_pedantic,
4132 "function definition declared %<auto%>");
4133 if (storage_class == csc_register)
4134 error ("function definition declared %<register%>");
4135 if (storage_class == csc_typedef)
4136 error ("function definition declared %<typedef%>");
4138 error ("function definition declared %<__thread%>");
4140 if (storage_class == csc_auto
4141 || storage_class == csc_register
4142 || storage_class == csc_typedef)
4143 storage_class = csc_none;
4145 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4147 if (decl_context == PARM && storage_class == csc_register)
4151 switch (decl_context)
4154 error ("storage class specified for structure field %qs",
4158 error ("storage class specified for parameter %qs", name);
4161 error ("storage class specified for typename");
4164 storage_class = csc_none;
4168 else if (storage_class == csc_extern
4172 /* 'extern' with initialization is invalid if not at file scope. */
4173 if (current_scope == file_scope)
4175 /* It is fine to have 'extern const' when compiling at C
4176 and C++ intersection. */
4177 if (!(warn_cxx_compat && constp))
4178 warning (0, "%qs initialized and declared %<extern%>", name);
4181 error ("%qs has both %<extern%> and initializer", name);
4183 else if (current_scope == file_scope)
4185 if (storage_class == csc_auto)
4186 error ("file-scope declaration of %qs specifies %<auto%>", name);
4187 if (pedantic && storage_class == csc_register)
4188 pedwarn (input_location, OPT_pedantic,
4189 "file-scope declaration of %qs specifies %<register%>", name);
4193 if (storage_class == csc_extern && funcdef_flag)
4194 error ("nested function %qs declared %<extern%>", name);
4195 else if (threadp && storage_class == csc_none)
4197 error ("function-scope %qs implicitly auto and declared "
4204 /* Now figure out the structure of the declarator proper.
4205 Descend through it, creating more complex types, until we reach
4206 the declared identifier (or NULL_TREE, in an absolute declarator).
4207 At each stage we maintain an unqualified version of the type
4208 together with any qualifiers that should be applied to it with
4209 c_build_qualified_type; this way, array types including
4210 multidimensional array types are first built up in unqualified
4211 form and then the qualified form is created with
4212 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4214 while (declarator && declarator->kind != cdk_id)
4216 if (type == error_mark_node)
4218 declarator = declarator->declarator;
4222 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4223 a cdk_pointer (for *...),
4224 a cdk_function (for ...(...)),
4225 a cdk_attrs (for nested attributes),
4226 or a cdk_id (for the name being declared
4227 or the place in an absolute declarator
4228 where the name was omitted).
4229 For the last case, we have just exited the loop.
4231 At this point, TYPE is the type of elements of an array,
4232 or for a function to return, or for a pointer to point to.
4233 After this sequence of ifs, TYPE is the type of the
4234 array or function or pointer, and DECLARATOR has had its
4235 outermost layer removed. */
4237 if (array_ptr_quals != TYPE_UNQUALIFIED
4238 || array_ptr_attrs != NULL_TREE
4239 || array_parm_static)
4241 /* Only the innermost declarator (making a parameter be of
4242 array type which is converted to pointer type)
4243 may have static or type qualifiers. */
4244 error ("static or type qualifiers in non-parameter array declarator");
4245 array_ptr_quals = TYPE_UNQUALIFIED;
4246 array_ptr_attrs = NULL_TREE;
4247 array_parm_static = 0;
4250 switch (declarator->kind)
4254 /* A declarator with embedded attributes. */
4255 tree attrs = declarator->u.attrs;
4256 const struct c_declarator *inner_decl;
4258 declarator = declarator->declarator;
4259 inner_decl = declarator;
4260 while (inner_decl->kind == cdk_attrs)
4261 inner_decl = inner_decl->declarator;
4262 if (inner_decl->kind == cdk_id)
4263 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4264 else if (inner_decl->kind == cdk_function)
4265 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4266 else if (inner_decl->kind == cdk_array)
4267 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4268 returned_attrs = decl_attributes (&type,
4269 chainon (returned_attrs, attrs),
4275 tree itype = NULL_TREE;
4276 tree size = declarator->u.array.dimen;
4277 /* The index is a signed object `sizetype' bits wide. */
4278 tree index_type = c_common_signed_type (sizetype);
4280 array_ptr_quals = declarator->u.array.quals;
4281 array_ptr_attrs = declarator->u.array.attrs;
4282 array_parm_static = declarator->u.array.static_p;
4283 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4285 declarator = declarator->declarator;
4287 /* Check for some types that there cannot be arrays of. */
4289 if (VOID_TYPE_P (type))
4291 error ("declaration of %qs as array of voids", name);
4292 type = error_mark_node;
4295 if (TREE_CODE (type) == FUNCTION_TYPE)
4297 error ("declaration of %qs as array of functions", name);
4298 type = error_mark_node;
4301 if (pedantic && !in_system_header && flexible_array_type_p (type))
4302 pedwarn (input_location, OPT_pedantic,
4303 "invalid use of structure with flexible array member");
4305 if (size == error_mark_node)
4306 type = error_mark_node;
4308 if (type == error_mark_node)
4311 /* If size was specified, set ITYPE to a range-type for
4312 that size. Otherwise, ITYPE remains null. finish_decl
4313 may figure it out from an initial value. */
4317 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4319 STRIP_TYPE_NOPS (size);
4321 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4323 error ("size of array %qs has non-integer type", name);
4324 size = integer_one_node;
4327 if (pedantic && integer_zerop (size))
4328 pedwarn (input_location, OPT_pedantic,
4329 "ISO C forbids zero-size array %qs", name);
4331 if (TREE_CODE (size) == INTEGER_CST)
4333 constant_expression_warning (size);
4334 if (tree_int_cst_sgn (size) < 0)
4336 error ("size of array %qs is negative", name);
4337 size = integer_one_node;
4340 else if ((decl_context == NORMAL || decl_context == FIELD)
4341 && current_scope == file_scope)
4343 error ("variably modified %qs at file scope", name);
4344 size = integer_one_node;
4348 /* Make sure the array size remains visibly
4349 nonconstant even if it is (eg) a const variable
4350 with known value. */
4352 warn_variable_length_array (orig_name, size);
4355 if (integer_zerop (size))
4357 /* A zero-length array cannot be represented with
4358 an unsigned index type, which is what we'll
4359 get with build_index_type. Create an
4360 open-ended range instead. */
4361 itype = build_range_type (sizetype, size, NULL_TREE);
4365 /* Arrange for the SAVE_EXPR on the inside of the
4366 MINUS_EXPR, which allows the -1 to get folded
4367 with the +1 that happens when building TYPE_SIZE. */
4369 size = variable_size (size);
4371 /* Compute the maximum valid index, that is, size
4372 - 1. Do the calculation in index_type, so that
4373 if it is a variable the computations will be
4374 done in the proper mode. */
4375 itype = fold_build2 (MINUS_EXPR, index_type,
4376 convert (index_type, size),
4377 convert (index_type,
4380 /* If that overflowed, the array is too big. ???
4381 While a size of INT_MAX+1 technically shouldn't
4382 cause an overflow (because we subtract 1), the
4383 overflow is recorded during the conversion to
4384 index_type, before the subtraction. Handling
4385 this case seems like an unnecessary
4387 if (TREE_CODE (itype) == INTEGER_CST
4388 && TREE_OVERFLOW (itype))
4390 error ("size of array %qs is too large", name);
4391 type = error_mark_node;
4395 itype = build_index_type (itype);
4398 else if (decl_context == FIELD)
4400 bool flexible_array_member = false;
4401 if (array_parm_vla_unspec_p)
4402 /* Field names can in fact have function prototype
4403 scope so [*] is disallowed here through making
4404 the field variably modified, not through being
4405 something other than a declaration with function
4410 const struct c_declarator *t = declarator;
4411 while (t->kind == cdk_attrs)
4413 flexible_array_member = (t->kind == cdk_id);
4415 if (flexible_array_member
4416 && pedantic && !flag_isoc99 && !in_system_header)
4417 pedwarn (input_location, OPT_pedantic,
4418 "ISO C90 does not support flexible array members");
4420 /* ISO C99 Flexible array members are effectively
4421 identical to GCC's zero-length array extension. */
4422 if (flexible_array_member || array_parm_vla_unspec_p)
4423 itype = build_range_type (sizetype, size_zero_node,
4426 else if (decl_context == PARM)
4428 if (array_parm_vla_unspec_p)
4430 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4434 else if (decl_context == TYPENAME)
4436 if (array_parm_vla_unspec_p)
4439 warning (0, "%<[*]%> not in a declaration");
4440 /* We use this to avoid messing up with incomplete
4441 array types of the same type, that would
4442 otherwise be modified below. */
4443 itype = build_range_type (sizetype, size_zero_node,
4449 /* Complain about arrays of incomplete types. */
4450 if (!COMPLETE_TYPE_P (type))
4452 error ("array type has incomplete element type");
4453 type = error_mark_node;
4456 /* When itype is NULL, a shared incomplete array type is
4457 returned for all array of a given type. Elsewhere we
4458 make sure we don't complete that type before copying
4459 it, but here we want to make sure we don't ever
4460 modify the shared type, so we gcc_assert (itype)
4462 type = build_array_type (type, itype);
4464 if (type != error_mark_node)
4468 /* It is ok to modify type here even if itype is
4469 NULL: if size_varies, we're in a
4470 multi-dimensional array and the inner type has
4471 variable size, so the enclosing shared array type
4473 if (size && TREE_CODE (size) == INTEGER_CST)
4475 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4476 C_TYPE_VARIABLE_SIZE (type) = 1;
4479 /* The GCC extension for zero-length arrays differs from
4480 ISO flexible array members in that sizeof yields
4482 if (size && integer_zerop (size))
4485 TYPE_SIZE (type) = bitsize_zero_node;
4486 TYPE_SIZE_UNIT (type) = size_zero_node;
4488 if (array_parm_vla_unspec_p)
4491 /* The type is complete. C99 6.7.5.2p4 */
4492 TYPE_SIZE (type) = bitsize_zero_node;
4493 TYPE_SIZE_UNIT (type) = size_zero_node;
4497 if (decl_context != PARM
4498 && (array_ptr_quals != TYPE_UNQUALIFIED
4499 || array_ptr_attrs != NULL_TREE
4500 || array_parm_static))
4502 error ("static or type qualifiers in non-parameter array declarator");
4503 array_ptr_quals = TYPE_UNQUALIFIED;
4504 array_ptr_attrs = NULL_TREE;
4505 array_parm_static = 0;
4511 /* Say it's a definition only for the declarator closest
4512 to the identifier, apart possibly from some
4514 bool really_funcdef = false;
4518 const struct c_declarator *t = declarator->declarator;
4519 while (t->kind == cdk_attrs)
4521 really_funcdef = (t->kind == cdk_id);
4524 /* Declaring a function type. Make sure we have a valid
4525 type for the function to return. */
4526 if (type == error_mark_node)
4531 /* Warn about some types functions can't return. */
4532 if (TREE_CODE (type) == FUNCTION_TYPE)
4534 error ("%qs declared as function returning a function", name);
4535 type = integer_type_node;
4537 if (TREE_CODE (type) == ARRAY_TYPE)
4539 error ("%qs declared as function returning an array", name);
4540 type = integer_type_node;
4543 /* Construct the function type and go to the next
4544 inner layer of declarator. */
4545 arg_info = declarator->u.arg_info;
4546 arg_types = grokparms (arg_info, really_funcdef);
4548 put_pending_sizes (arg_info->pending_sizes);
4550 /* Type qualifiers before the return type of the function
4551 qualify the return type, not the function type. */
4554 /* Type qualifiers on a function return type are
4555 normally permitted by the standard but have no
4556 effect, so give a warning at -Wreturn-type.
4557 Qualifiers on a void return type are banned on
4558 function definitions in ISO C; GCC used to used
4559 them for noreturn functions. */
4560 if (VOID_TYPE_P (type) && really_funcdef)
4561 pedwarn (input_location, 0,
4562 "function definition has qualified void return type");
4564 warning (OPT_Wignored_qualifiers,
4565 "type qualifiers ignored on function return type");
4567 type = c_build_qualified_type (type, type_quals);
4569 type_quals = TYPE_UNQUALIFIED;
4571 type = build_function_type (type, arg_types);
4572 declarator = declarator->declarator;
4574 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4575 the formal parameter list of this FUNCTION_TYPE to point to
4576 the FUNCTION_TYPE node itself. */
4580 for (link = arg_info->tags;
4582 link = TREE_CHAIN (link))
4583 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4589 /* Merge any constancy or volatility into the target type
4592 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4594 pedwarn (input_location, OPT_pedantic,
4595 "ISO C forbids qualified function types");
4597 type = c_build_qualified_type (type, type_quals);
4600 /* When the pointed-to type involves components of variable size,
4601 care must be taken to ensure that the size evaluation code is
4602 emitted early enough to dominate all the possible later uses
4603 and late enough for the variables on which it depends to have
4606 This is expected to happen automatically when the pointed-to
4607 type has a name/declaration of it's own, but special attention
4608 is required if the type is anonymous.
4610 We handle the NORMAL and FIELD contexts here by attaching an
4611 artificial TYPE_DECL to such pointed-to type. This forces the
4612 sizes evaluation at a safe point and ensures it is not deferred
4613 until e.g. within a deeper conditional context.
4615 We expect nothing to be needed here for PARM or TYPENAME.
4616 Pushing a TYPE_DECL at this point for TYPENAME would actually
4617 be incorrect, as we might be in the middle of an expression
4618 with side effects on the pointed-to type size "arguments" prior
4619 to the pointer declaration point and the fake TYPE_DECL in the
4620 enclosing context would force the size evaluation prior to the
4623 if (!TYPE_NAME (type)
4624 && (decl_context == NORMAL || decl_context == FIELD)
4625 && variably_modified_type_p (type, NULL_TREE))
4627 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4628 DECL_ARTIFICIAL (decl) = 1;
4630 finish_decl (decl, NULL_TREE, NULL_TREE);
4631 TYPE_NAME (type) = decl;
4634 type = build_pointer_type (type);
4636 /* Process type qualifiers (such as const or volatile)
4637 that were given inside the `*'. */
4638 type_quals = declarator->u.pointer_quals;
4640 declarator = declarator->declarator;
4647 *decl_attrs = chainon (returned_attrs, *decl_attrs);
4649 /* Now TYPE has the actual type, apart from any qualifiers in
4652 /* Check the type and width of a bit-field. */
4654 check_bitfield_type_and_width (&type, width, orig_name);
4656 /* Did array size calculations overflow? */
4658 if (TREE_CODE (type) == ARRAY_TYPE
4659 && COMPLETE_TYPE_P (type)
4660 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4661 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4663 error ("size of array %qs is too large", name);
4664 /* If we proceed with the array type as it is, we'll eventually
4665 crash in tree_low_cst(). */
4666 type = error_mark_node;
4669 /* If this is declaring a typedef name, return a TYPE_DECL. */
4671 if (storage_class == csc_typedef)
4674 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4676 pedwarn (input_location, OPT_pedantic,
4677 "ISO C forbids qualified function types");
4679 type = c_build_qualified_type (type, type_quals);
4680 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4681 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4682 if (declspecs->explicit_signed_p)
4683 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4684 if (declspecs->inline_p)
4685 pedwarn (input_location, 0,"typedef %q+D declared %<inline%>", decl);
4689 /* If this is a type name (such as, in a cast or sizeof),
4690 compute the type and return it now. */
4692 if (decl_context == TYPENAME)
4694 /* Note that the grammar rejects storage classes in typenames
4696 gcc_assert (storage_class == csc_none && !threadp
4697 && !declspecs->inline_p);
4698 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4700 pedwarn (input_location, OPT_pedantic,
4701 "ISO C forbids const or volatile function types");
4703 type = c_build_qualified_type (type, type_quals);
4707 if (pedantic && decl_context == FIELD
4708 && variably_modified_type_p (type, NULL_TREE))
4711 pedwarn (input_location, OPT_pedantic,
4712 "a member of a structure or union cannot have a variably modified type");
4715 /* Aside from typedefs and type names (handle above),
4716 `void' at top level (not within pointer)
4717 is allowed only in public variables.
4718 We don't complain about parms either, but that is because
4719 a better error message can be made later. */
4721 if (VOID_TYPE_P (type) && decl_context != PARM
4722 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4723 && (storage_class == csc_extern
4724 || (current_scope == file_scope
4725 && !(storage_class == csc_static
4726 || storage_class == csc_register)))))
4728 error ("variable or field %qs declared void", name);
4729 type = integer_type_node;
4732 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4733 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4738 if (decl_context == PARM)
4742 /* A parameter declared as an array of T is really a pointer to T.
4743 One declared as a function is really a pointer to a function. */
4745 if (TREE_CODE (type) == ARRAY_TYPE)
4747 /* Transfer const-ness of array into that of type pointed to. */
4748 type = TREE_TYPE (type);
4750 type = c_build_qualified_type (type, type_quals);
4751 type = build_pointer_type (type);
4752 type_quals = array_ptr_quals;
4754 type = c_build_qualified_type (type, type_quals);
4756 /* We don't yet implement attributes in this context. */
4757 if (array_ptr_attrs != NULL_TREE)
4758 warning (OPT_Wattributes,
4759 "attributes in parameter array declarator ignored");
4763 else if (TREE_CODE (type) == FUNCTION_TYPE)
4766 pedwarn (input_location, OPT_pedantic,
4767 "ISO C forbids qualified function types");
4769 type = c_build_qualified_type (type, type_quals);
4770 type = build_pointer_type (type);
4771 type_quals = TYPE_UNQUALIFIED;
4773 else if (type_quals)
4774 type = c_build_qualified_type (type, type_quals);
4776 decl = build_decl (PARM_DECL, declarator->u.id, type);
4777 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4779 C_DECL_VARIABLE_SIZE (decl) = 1;
4781 /* Compute the type actually passed in the parmlist,
4782 for the case where there is no prototype.
4783 (For example, shorts and chars are passed as ints.)
4784 When there is a prototype, this is overridden later. */
4786 if (type == error_mark_node)
4787 promoted_type = type;
4789 promoted_type = c_type_promotes_to (type);
4791 DECL_ARG_TYPE (decl) = promoted_type;
4792 if (declspecs->inline_p)
4793 pedwarn (input_location, 0, "parameter %q+D declared %<inline%>", decl);
4795 else if (decl_context == FIELD)
4797 /* Note that the grammar rejects storage classes in typenames
4799 gcc_assert (storage_class == csc_none && !threadp
4800 && !declspecs->inline_p);
4802 /* Structure field. It may not be a function. */
4804 if (TREE_CODE (type) == FUNCTION_TYPE)
4806 error ("field %qs declared as a function", name);
4807 type = build_pointer_type (type);
4809 else if (TREE_CODE (type) != ERROR_MARK
4810 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4812 error ("field %qs has incomplete type", name);
4813 type = error_mark_node;
4815 type = c_build_qualified_type (type, type_quals);
4816 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4817 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4818 DECL_NONADDRESSABLE_P (decl) = bitfield;
4819 if (bitfield && !declarator->u.id)
4820 TREE_NO_WARNING (decl) = 1;
4823 C_DECL_VARIABLE_SIZE (decl) = 1;
4825 else if (TREE_CODE (type) == FUNCTION_TYPE)
4827 if (storage_class == csc_register || threadp)
4829 error ("invalid storage class for function %qs", name);
4831 else if (current_scope != file_scope)
4833 /* Function declaration not at file scope. Storage
4834 classes other than `extern' are not allowed, C99
4835 6.7.1p5, and `extern' makes no difference. However,
4836 GCC allows 'auto', perhaps with 'inline', to support
4837 nested functions. */
4838 if (storage_class == csc_auto)
4839 pedwarn (input_location, OPT_pedantic, "invalid storage class for function %qs", name);
4840 else if (storage_class == csc_static)
4842 error ("invalid storage class for function %qs", name);
4844 storage_class = declspecs->storage_class = csc_none;
4850 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4851 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4852 decl = build_decl_attribute_variant (decl, decl_attr);
4854 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4855 pedwarn (input_location, OPT_pedantic,
4856 "ISO C forbids qualified function types");
4858 /* GNU C interprets a volatile-qualified function type to indicate
4859 that the function does not return. */
4860 if ((type_quals & TYPE_QUAL_VOLATILE)
4861 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4862 warning (0, "%<noreturn%> function returns non-void value");
4864 /* Every function declaration is an external reference
4865 (DECL_EXTERNAL) except for those which are not at file
4866 scope and are explicitly declared "auto". This is
4867 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4868 GCC to signify a forward declaration of a nested function. */
4869 if (storage_class == csc_auto && current_scope != file_scope)
4870 DECL_EXTERNAL (decl) = 0;
4871 /* In C99, a function which is declared 'inline' with 'extern'
4872 is not an external reference (which is confusing). It
4873 means that the later definition of the function must be output
4874 in this file, C99 6.7.4p6. In GNU C89, a function declared
4875 'extern inline' is an external reference. */
4876 else if (declspecs->inline_p && storage_class != csc_static)
4877 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4878 == flag_gnu89_inline);
4880 DECL_EXTERNAL (decl) = !initialized;
4882 /* Record absence of global scope for `static' or `auto'. */
4884 = !(storage_class == csc_static || storage_class == csc_auto);
4886 /* For a function definition, record the argument information
4887 block where store_parm_decls will look for it. */
4889 current_function_arg_info = arg_info;
4891 if (declspecs->default_int_p)
4892 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4894 /* Record presence of `inline', if it is reasonable. */
4895 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4897 if (declspecs->inline_p)
4898 pedwarn (input_location, 0, "cannot inline function %<main%>");
4900 else if (declspecs->inline_p)
4901 /* Record that the function is declared `inline'. */
4902 DECL_DECLARED_INLINE_P (decl) = 1;
4906 /* It's a variable. */
4907 /* An uninitialized decl with `extern' is a reference. */
4908 int extern_ref = !initialized && storage_class == csc_extern;
4910 type = c_build_qualified_type (type, type_quals);
4912 /* C99 6.2.2p7: It is invalid (compile-time undefined
4913 behavior) to create an 'extern' declaration for a
4914 variable if there is a global declaration that is
4915 'static' and the global declaration is not visible.
4916 (If the static declaration _is_ currently visible,
4917 the 'extern' declaration is taken to refer to that decl.) */
4918 if (extern_ref && current_scope != file_scope)
4920 tree global_decl = identifier_global_value (declarator->u.id);
4921 tree visible_decl = lookup_name (declarator->u.id);
4924 && global_decl != visible_decl
4925 && TREE_CODE (global_decl) == VAR_DECL
4926 && !TREE_PUBLIC (global_decl))
4927 error ("variable previously declared %<static%> redeclared "
4931 decl = build_decl (VAR_DECL, declarator->u.id, type);
4932 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4934 C_DECL_VARIABLE_SIZE (decl) = 1;
4936 if (declspecs->inline_p)
4937 pedwarn (input_location, 0, "variable %q+D declared %<inline%>", decl);
4939 /* At file scope, an initialized extern declaration may follow
4940 a static declaration. In that case, DECL_EXTERNAL will be
4941 reset later in start_decl. */
4942 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4944 /* At file scope, the presence of a `static' or `register' storage
4945 class specifier, or the absence of all storage class specifiers
4946 makes this declaration a definition (perhaps tentative). Also,
4947 the absence of `static' makes it public. */
4948 if (current_scope == file_scope)
4950 TREE_PUBLIC (decl) = storage_class != csc_static;
4951 TREE_STATIC (decl) = !extern_ref;
4953 /* Not at file scope, only `static' makes a static definition. */
4956 TREE_STATIC (decl) = (storage_class == csc_static);
4957 TREE_PUBLIC (decl) = extern_ref;
4961 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4964 if (storage_class == csc_extern
4965 && variably_modified_type_p (type, NULL_TREE))
4968 error ("object with variably modified type must have no linkage");
4971 /* Record `register' declaration for warnings on &
4972 and in case doing stupid register allocation. */
4974 if (storage_class == csc_register)
4976 C_DECL_REGISTER (decl) = 1;
4977 DECL_REGISTER (decl) = 1;
4980 /* Record constancy and volatility. */
4981 c_apply_type_quals_to_decl (type_quals, decl);
4983 /* If a type has volatile components, it should be stored in memory.
4984 Otherwise, the fact that those components are volatile
4985 will be ignored, and would even crash the compiler.
4986 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4987 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4988 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4989 || TREE_CODE (decl) == RESULT_DECL))
4991 /* It is not an error for a structure with volatile fields to
4992 be declared register, but reset DECL_REGISTER since it
4993 cannot actually go in a register. */
4994 int was_reg = C_DECL_REGISTER (decl);
4995 C_DECL_REGISTER (decl) = 0;
4996 DECL_REGISTER (decl) = 0;
4997 c_mark_addressable (decl);
4998 C_DECL_REGISTER (decl) = was_reg;
5001 /* This is the earliest point at which we might know the assembler
5002 name of a variable. Thus, if it's known before this, die horribly. */
5003 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
5009 /* Decode the parameter-list info for a function type or function definition.
5010 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5011 if there is an identifier list instead of a parameter decl list).
5012 These two functions are separate because when a function returns
5013 or receives functions then each is called multiple times but the order
5014 of calls is different. The last call to `grokparms' is always the one
5015 that contains the formal parameter names of a function definition.
5017 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5019 FUNCDEF_FLAG is true for a function definition, false for
5020 a mere declaration. A nonempty identifier-list gets an error message
5021 when FUNCDEF_FLAG is false. */
5024 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5026 tree arg_types = arg_info->types;
5028 if (funcdef_flag && arg_info->had_vla_unspec)
5030 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5032 error ("%<[*]%> not allowed in other than function prototype scope");
5035 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5036 warning (OPT_Wstrict_prototypes,
5037 "function declaration isn%'t a prototype");
5039 if (arg_types == error_mark_node)
5040 return 0; /* don't set TYPE_ARG_TYPES in this case */
5042 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5045 pedwarn (input_location, 0, "parameter names (without types) in function declaration");
5047 arg_info->parms = arg_info->types;
5048 arg_info->types = 0;
5053 tree parm, type, typelt;
5054 unsigned int parmno;
5056 /* If there is a parameter of incomplete type in a definition,
5057 this is an error. In a declaration this is valid, and a
5058 struct or union type may be completed later, before any calls
5059 or definition of the function. In the case where the tag was
5060 first declared within the parameter list, a warning has
5061 already been given. If a parameter has void type, then
5062 however the function cannot be defined or called, so
5065 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5067 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5069 type = TREE_VALUE (typelt);
5070 if (type == error_mark_node)
5073 if (!COMPLETE_TYPE_P (type))
5077 if (DECL_NAME (parm))
5078 error ("parameter %u (%q+D) has incomplete type",
5081 error ("%Jparameter %u has incomplete type",
5084 TREE_VALUE (typelt) = error_mark_node;
5085 TREE_TYPE (parm) = error_mark_node;
5087 else if (VOID_TYPE_P (type))
5089 if (DECL_NAME (parm))
5090 warning (0, "parameter %u (%q+D) has void type",
5093 warning (0, "%Jparameter %u has void type",
5098 if (DECL_NAME (parm) && TREE_USED (parm))
5099 warn_if_shadowing (parm);
5105 /* Take apart the current scope and return a c_arg_info structure with
5106 info on a parameter list just parsed.
5108 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5110 ELLIPSIS being true means the argument list ended in '...' so don't
5111 append a sentinel (void_list_node) to the end of the type-list. */
5114 get_parm_info (bool ellipsis)
5116 struct c_binding *b = current_scope->bindings;
5117 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5124 static bool explained_incomplete_types = false;
5125 bool gave_void_only_once_err = false;
5127 arg_info->parms = 0;
5129 arg_info->types = 0;
5130 arg_info->others = 0;
5131 arg_info->pending_sizes = 0;
5132 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5134 /* The bindings in this scope must not get put into a block.
5135 We will take care of deleting the binding nodes. */
5136 current_scope->bindings = 0;
5138 /* This function is only called if there was *something* on the
5142 /* A parameter list consisting solely of 'void' indicates that the
5143 function takes no arguments. But if the 'void' is qualified
5144 (by 'const' or 'volatile'), or has a storage class specifier
5145 ('register'), then the behavior is undefined; issue an error.
5146 Typedefs for 'void' are OK (see DR#157). */
5147 if (b->prev == 0 /* one binding */
5148 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5149 && !DECL_NAME (b->decl) /* anonymous */
5150 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5152 if (TREE_THIS_VOLATILE (b->decl)
5153 || TREE_READONLY (b->decl)
5154 || C_DECL_REGISTER (b->decl))
5155 error ("%<void%> as only parameter may not be qualified");
5157 /* There cannot be an ellipsis. */
5159 error ("%<void%> must be the only parameter");
5161 arg_info->types = void_list_node;
5166 types = void_list_node;
5168 /* Break up the bindings list into parms, tags, types, and others;
5169 apply sanity checks; purge the name-to-decl bindings. */
5172 tree decl = b->decl;
5173 tree type = TREE_TYPE (decl);
5174 const char *keyword;
5176 switch (TREE_CODE (decl))
5181 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5182 I_SYMBOL_BINDING (b->id) = b->shadowed;
5185 /* Check for forward decls that never got their actual decl. */
5186 if (TREE_ASM_WRITTEN (decl))
5187 error ("parameter %q+D has just a forward declaration", decl);
5188 /* Check for (..., void, ...) and issue an error. */
5189 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5191 if (!gave_void_only_once_err)
5193 error ("%<void%> must be the only parameter");
5194 gave_void_only_once_err = true;
5199 /* Valid parameter, add it to the list. */
5200 TREE_CHAIN (decl) = parms;
5203 /* Since there is a prototype, args are passed in their
5204 declared types. The back end may override this later. */
5205 DECL_ARG_TYPE (decl) = type;
5206 types = tree_cons (0, type, types);
5210 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5211 case UNION_TYPE: keyword = "union"; goto tag;
5212 case RECORD_TYPE: keyword = "struct"; goto tag;
5214 /* Types may not have tag-names, in which case the type
5215 appears in the bindings list with b->id NULL. */
5218 gcc_assert (I_TAG_BINDING (b->id) == b);
5219 I_TAG_BINDING (b->id) = b->shadowed;
5222 /* Warn about any struct, union or enum tags defined in a
5223 parameter list. The scope of such types is limited to
5224 the parameter list, which is rarely if ever desirable
5225 (it's impossible to call such a function with type-
5226 correct arguments). An anonymous union parm type is
5227 meaningful as a GNU extension, so don't warn for that. */
5228 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5231 /* The %s will be one of 'struct', 'union', or 'enum'. */
5232 warning (0, "%<%s %E%> declared inside parameter list",
5235 /* The %s will be one of 'struct', 'union', or 'enum'. */
5236 warning (0, "anonymous %s declared inside parameter list",
5239 if (!explained_incomplete_types)
5241 warning (0, "its scope is only this definition or declaration,"
5242 " which is probably not what you want");
5243 explained_incomplete_types = true;
5247 tags = tree_cons (b->id, decl, tags);
5253 /* CONST_DECLs appear here when we have an embedded enum,
5254 and TYPE_DECLs appear here when we have an embedded struct
5255 or union. No warnings for this - we already warned about the
5256 type itself. FUNCTION_DECLs appear when there is an implicit
5257 function declaration in the parameter list. */
5259 /* When we reinsert this decl in the function body, we need
5260 to reconstruct whether it was marked as nested. */
5261 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5264 TREE_CHAIN (decl) = others;
5269 /* error_mark_node appears here when we have an undeclared
5270 variable. Just throw it away. */
5273 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5274 I_SYMBOL_BINDING (b->id) = b->shadowed;
5278 /* Other things that might be encountered. */
5285 b = free_binding_and_advance (b);
5288 arg_info->parms = parms;
5289 arg_info->tags = tags;
5290 arg_info->types = types;
5291 arg_info->others = others;
5292 arg_info->pending_sizes = get_pending_sizes ();
5296 /* Get the struct, enum or union (CODE says which) with tag NAME.
5297 Define the tag as a forward-reference if it is not defined.
5298 Return a c_typespec structure for the type specifier. */
5301 parser_xref_tag (enum tree_code code, tree name)
5303 struct c_typespec ret;
5304 /* If a cross reference is requested, look up the type
5305 already defined for this tag and return it. */
5307 tree ref = lookup_tag (code, name, 0);
5308 /* If this is the right type of tag, return what we found.
5309 (This reference will be shadowed by shadow_tag later if appropriate.)
5310 If this is the wrong type of tag, do not return it. If it was the
5311 wrong type in the same scope, we will have had an error
5312 message already; if in a different scope and declaring
5313 a name, pending_xref_error will give an error message; but if in a
5314 different scope and not declaring a name, this tag should
5315 shadow the previous declaration of a different type of tag, and
5316 this would not work properly if we return the reference found.
5317 (For example, with "struct foo" in an outer scope, "union foo;"
5318 must shadow that tag with a new one of union type.) */
5319 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5320 if (ref && TREE_CODE (ref) == code)
5326 /* If no such tag is yet defined, create a forward-reference node
5327 and record it as the "definition".
5328 When a real declaration of this type is found,
5329 the forward-reference will be altered into a real type. */
5331 ref = make_node (code);
5332 if (code == ENUMERAL_TYPE)
5334 /* Give the type a default layout like unsigned int
5335 to avoid crashing if it does not get defined. */
5336 SET_TYPE_MODE (ref, TYPE_MODE (unsigned_type_node));
5337 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5338 TYPE_USER_ALIGN (ref) = 0;
5339 TYPE_UNSIGNED (ref) = 1;
5340 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5341 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5342 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5345 pushtag (name, ref);
5351 /* Get the struct, enum or union (CODE says which) with tag NAME.
5352 Define the tag as a forward-reference if it is not defined.
5353 Return a tree for the type. */
5356 xref_tag (enum tree_code code, tree name)
5358 return parser_xref_tag (code, name).spec;
5361 /* Make sure that the tag NAME is defined *in the current scope*
5362 at least as a forward reference.
5363 CODE says which kind of tag NAME ought to be. */
5366 start_struct (enum tree_code code, tree name)
5368 /* If there is already a tag defined at this scope
5369 (as a forward reference), just return it. */
5374 ref = lookup_tag (code, name, 1);
5375 if (ref && TREE_CODE (ref) == code)
5377 if (TYPE_SIZE (ref))
5379 if (code == UNION_TYPE)
5380 error ("redefinition of %<union %E%>", name);
5382 error ("redefinition of %<struct %E%>", name);
5383 /* Don't create structures using a name already in use. */
5386 else if (C_TYPE_BEING_DEFINED (ref))
5388 if (code == UNION_TYPE)
5389 error ("nested redefinition of %<union %E%>", name);
5391 error ("nested redefinition of %<struct %E%>", name);
5392 /* Don't create structures that contain themselves. */
5397 /* Otherwise create a forward-reference just so the tag is in scope. */
5399 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5401 ref = make_node (code);
5402 pushtag (name, ref);
5405 C_TYPE_BEING_DEFINED (ref) = 1;
5406 TYPE_PACKED (ref) = flag_pack_struct;
5410 /* Process the specs, declarator and width (NULL if omitted)
5411 of a structure component, returning a FIELD_DECL node.
5412 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5413 DECL_ATTRS is as for grokdeclarator.
5415 LOC is the location of the structure component.
5417 This is done during the parsing of the struct declaration.
5418 The FIELD_DECL nodes are chained together and the lot of them
5419 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5422 grokfield (location_t loc,
5423 struct c_declarator *declarator, struct c_declspecs *declspecs,
5424 tree width, tree *decl_attrs)
5428 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5429 && width == NULL_TREE)
5431 /* This is an unnamed decl.
5433 If we have something of the form "union { list } ;" then this
5434 is the anonymous union extension. Similarly for struct.
5436 If this is something of the form "struct foo;", then
5437 If MS extensions are enabled, this is handled as an
5439 Otherwise this is a forward declaration of a structure tag.
5441 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5442 If MS extensions are enabled and foo names a structure, then
5443 again this is an anonymous struct.
5444 Otherwise this is an error.
5446 Oh what a horrid tangled web we weave. I wonder if MS consciously
5447 took this from Plan 9 or if it was an accident of implementation
5448 that took root before someone noticed the bug... */
5450 tree type = declspecs->type;
5451 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5452 || TREE_CODE (type) == UNION_TYPE);
5456 && (flag_ms_extensions || !declspecs->typedef_p))
5458 if (flag_ms_extensions)
5462 else if (TYPE_NAME (type) == NULL)
5469 pedwarn (loc, 0, "declaration does not declare anything");
5472 pedwarn (loc, OPT_pedantic, "ISO C doesn%'t support unnamed structs/unions");
5475 value = grokdeclarator (declarator, declspecs, FIELD, false,
5476 width ? &width : NULL, decl_attrs,
5479 finish_decl (value, NULL_TREE, NULL_TREE);
5480 DECL_INITIAL (value) = width;
5485 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5486 the list such that this does not present a problem later. */
5489 detect_field_duplicates (tree fieldlist)
5494 /* First, see if there are more than "a few" fields.
5495 This is trivially true if there are zero or one fields. */
5498 x = TREE_CHAIN (fieldlist);
5504 } while (timeout > 0 && x);
5506 /* If there were "few" fields, avoid the overhead of allocating
5507 a hash table. Instead just do the nested traversal thing. */
5510 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5513 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5514 if (DECL_NAME (y) == DECL_NAME (x))
5516 error ("duplicate member %q+D", x);
5517 DECL_NAME (x) = NULL_TREE;
5523 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5526 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5527 if ((y = DECL_NAME (x)) != 0)
5529 slot = htab_find_slot (htab, y, INSERT);
5532 error ("duplicate member %q+D", x);
5533 DECL_NAME (x) = NULL_TREE;
5542 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5543 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5544 ATTRIBUTES are attributes to be applied to the structure. */
5547 finish_struct (tree t, tree fieldlist, tree attributes)
5550 bool toplevel = file_scope == current_scope;
5551 int saw_named_field;
5553 /* If this type was previously laid out as a forward reference,
5554 make sure we lay it out again. */
5558 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5562 for (x = fieldlist; x; x = TREE_CHAIN (x))
5563 if (DECL_NAME (x) != 0)
5568 if (TREE_CODE (t) == UNION_TYPE)
5571 pedwarn (input_location, OPT_pedantic, "union has no named members");
5573 pedwarn (input_location, OPT_pedantic, "union has no members");
5578 pedwarn (input_location, OPT_pedantic, "struct has no named members");
5580 pedwarn (input_location, OPT_pedantic, "struct has no members");
5585 /* Install struct as DECL_CONTEXT of each field decl.
5586 Also process specified field sizes, found in the DECL_INITIAL,
5587 storing 0 there after the type has been changed to precision equal
5588 to its width, rather than the precision of the specified standard
5589 type. (Correct layout requires the original type to have been preserved
5592 saw_named_field = 0;
5593 for (x = fieldlist; x; x = TREE_CHAIN (x))
5595 if (TREE_TYPE (x) == error_mark_node)
5598 DECL_CONTEXT (x) = t;
5600 /* If any field is const, the structure type is pseudo-const. */
5601 if (TREE_READONLY (x))
5602 C_TYPE_FIELDS_READONLY (t) = 1;
5605 /* A field that is pseudo-const makes the structure likewise. */
5606 tree t1 = TREE_TYPE (x);
5607 while (TREE_CODE (t1) == ARRAY_TYPE)
5608 t1 = TREE_TYPE (t1);
5609 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5610 && C_TYPE_FIELDS_READONLY (t1))
5611 C_TYPE_FIELDS_READONLY (t) = 1;
5614 /* Any field that is volatile means variables of this type must be
5615 treated in some ways as volatile. */
5616 if (TREE_THIS_VOLATILE (x))
5617 C_TYPE_FIELDS_VOLATILE (t) = 1;
5619 /* Any field of nominal variable size implies structure is too. */
5620 if (C_DECL_VARIABLE_SIZE (x))
5621 C_TYPE_VARIABLE_SIZE (t) = 1;
5623 if (DECL_INITIAL (x))
5625 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5626 DECL_SIZE (x) = bitsize_int (width);
5627 DECL_BIT_FIELD (x) = 1;
5628 SET_DECL_C_BIT_FIELD (x);
5632 && (DECL_BIT_FIELD (x)
5633 || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT))
5634 DECL_PACKED (x) = 1;
5636 /* Detect flexible array member in an invalid context. */
5637 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5638 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5639 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5640 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5642 if (TREE_CODE (t) == UNION_TYPE)
5644 error ("%Jflexible array member in union", x);
5645 TREE_TYPE (x) = error_mark_node;
5647 else if (TREE_CHAIN (x) != NULL_TREE)
5649 error ("%Jflexible array member not at end of struct", x);
5650 TREE_TYPE (x) = error_mark_node;
5652 else if (!saw_named_field)
5654 error ("%Jflexible array member in otherwise empty struct", x);
5655 TREE_TYPE (x) = error_mark_node;
5659 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5660 && flexible_array_type_p (TREE_TYPE (x)))
5661 pedwarn (input_location, OPT_pedantic,
5662 "%Jinvalid use of structure with flexible array member", x);
5665 saw_named_field = 1;
5668 detect_field_duplicates (fieldlist);
5670 /* Now we have the nearly final fieldlist. Record it,
5671 then lay out the structure or union (including the fields). */
5673 TYPE_FIELDS (t) = fieldlist;
5677 /* Give bit-fields their proper types. */
5679 tree *fieldlistp = &fieldlist;
5681 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5682 && TREE_TYPE (*fieldlistp) != error_mark_node)
5684 unsigned HOST_WIDE_INT width
5685 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5686 tree type = TREE_TYPE (*fieldlistp);
5687 if (width != TYPE_PRECISION (type))
5689 TREE_TYPE (*fieldlistp)
5690 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5691 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5693 DECL_INITIAL (*fieldlistp) = 0;
5696 fieldlistp = &TREE_CHAIN (*fieldlistp);
5699 /* Now we have the truly final field list.
5700 Store it in this type and in the variants. */
5702 TYPE_FIELDS (t) = fieldlist;
5704 /* If there are lots of fields, sort so we can look through them fast.
5705 We arbitrarily consider 16 or more elts to be "a lot". */
5710 for (x = fieldlist; x; x = TREE_CHAIN (x))
5712 if (len > 15 || DECL_NAME (x) == NULL)
5720 struct lang_type *space;
5721 struct sorted_fields_type *space2;
5723 len += list_length (x);
5725 /* Use the same allocation policy here that make_node uses, to
5726 ensure that this lives as long as the rest of the struct decl.
5727 All decls in an inline function need to be saved. */
5729 space = GGC_CNEW (struct lang_type);
5730 space2 = GGC_NEWVAR (struct sorted_fields_type,
5731 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5735 field_array = &space2->elts[0];
5736 for (x = fieldlist; x; x = TREE_CHAIN (x))
5738 field_array[len++] = x;
5740 /* If there is anonymous struct or union, break out of the loop. */
5741 if (DECL_NAME (x) == NULL)
5744 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5747 TYPE_LANG_SPECIFIC (t) = space;
5748 TYPE_LANG_SPECIFIC (t)->s->len = len;
5749 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5750 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5755 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5757 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5758 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5759 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5760 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5761 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5764 /* If this was supposed to be a transparent union, but we can't
5765 make it one, warn and turn off the flag. */
5766 if (TREE_CODE (t) == UNION_TYPE
5767 && TYPE_TRANSPARENT_UNION (t)
5768 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5770 TYPE_TRANSPARENT_UNION (t) = 0;
5771 warning (0, "union cannot be made transparent");
5774 /* If this structure or union completes the type of any previous
5775 variable declaration, lay it out and output its rtl. */
5776 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5780 tree decl = TREE_VALUE (x);
5781 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5782 layout_array_type (TREE_TYPE (decl));
5783 if (TREE_CODE (decl) != TYPE_DECL)
5785 layout_decl (decl, 0);
5786 if (c_dialect_objc ())
5787 objc_check_decl (decl);
5788 rest_of_decl_compilation (decl, toplevel, 0);
5793 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5795 /* Finish debugging output for this type. */
5796 rest_of_type_compilation (t, toplevel);
5798 /* If we're inside a function proper, i.e. not file-scope and not still
5799 parsing parameters, then arrange for the size of a variable sized type
5801 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5802 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5807 /* Lay out the type T, and its element type, and so on. */
5810 layout_array_type (tree t)
5812 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5813 layout_array_type (TREE_TYPE (t));
5817 /* Begin compiling the definition of an enumeration type.
5818 NAME is its name (or null if anonymous).
5819 Returns the type object, as yet incomplete.
5820 Also records info about it so that build_enumerator
5821 may be used to declare the individual values as they are read. */
5824 start_enum (struct c_enum_contents *the_enum, tree name)
5828 /* If this is the real definition for a previous forward reference,
5829 fill in the contents in the same object that used to be the
5830 forward reference. */
5833 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5835 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5837 enumtype = make_node (ENUMERAL_TYPE);
5838 pushtag (name, enumtype);
5841 if (C_TYPE_BEING_DEFINED (enumtype))
5842 error ("nested redefinition of %<enum %E%>", name);
5844 C_TYPE_BEING_DEFINED (enumtype) = 1;
5846 if (TYPE_VALUES (enumtype) != 0)
5848 /* This enum is a named one that has been declared already. */
5849 error ("redeclaration of %<enum %E%>", name);
5851 /* Completely replace its old definition.
5852 The old enumerators remain defined, however. */
5853 TYPE_VALUES (enumtype) = 0;
5856 the_enum->enum_next_value = integer_zero_node;
5857 the_enum->enum_overflow = 0;
5859 if (flag_short_enums)
5860 TYPE_PACKED (enumtype) = 1;
5865 /* After processing and defining all the values of an enumeration type,
5866 install their decls in the enumeration type and finish it off.
5867 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5868 and ATTRIBUTES are the specified attributes.
5869 Returns ENUMTYPE. */
5872 finish_enum (tree enumtype, tree values, tree attributes)
5875 tree minnode = 0, maxnode = 0;
5876 int precision, unsign;
5877 bool toplevel = (file_scope == current_scope);
5878 struct lang_type *lt;
5880 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5882 /* Calculate the maximum value of any enumerator in this type. */
5884 if (values == error_mark_node)
5885 minnode = maxnode = integer_zero_node;
5888 minnode = maxnode = TREE_VALUE (values);
5889 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5891 tree value = TREE_VALUE (pair);
5892 if (tree_int_cst_lt (maxnode, value))
5894 if (tree_int_cst_lt (value, minnode))
5899 /* Construct the final type of this enumeration. It is the same
5900 as one of the integral types - the narrowest one that fits, except
5901 that normally we only go as narrow as int - and signed iff any of
5902 the values are negative. */
5903 unsign = (tree_int_cst_sgn (minnode) >= 0);
5904 precision = MAX (tree_int_cst_min_precision (minnode, unsign),
5905 tree_int_cst_min_precision (maxnode, unsign));
5907 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5909 tem = c_common_type_for_size (precision, unsign);
5912 warning (0, "enumeration values exceed range of largest integer");
5913 tem = long_long_integer_type_node;
5917 tem = unsign ? unsigned_type_node : integer_type_node;
5919 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5920 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5921 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5922 TYPE_SIZE (enumtype) = 0;
5924 /* If the precision of the type was specific with an attribute and it
5925 was too small, give an error. Otherwise, use it. */
5926 if (TYPE_PRECISION (enumtype))
5928 if (precision > TYPE_PRECISION (enumtype))
5929 error ("specified mode too small for enumeral values");
5932 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5934 layout_type (enumtype);
5936 if (values != error_mark_node)
5938 /* Change the type of the enumerators to be the enum type. We
5939 need to do this irrespective of the size of the enum, for
5940 proper type checking. Replace the DECL_INITIALs of the
5941 enumerators, and the value slots of the list, with copies
5942 that have the enum type; they cannot be modified in place
5943 because they may be shared (e.g. integer_zero_node) Finally,
5944 change the purpose slots to point to the names of the decls. */
5945 for (pair = values; pair; pair = TREE_CHAIN (pair))
5947 tree enu = TREE_PURPOSE (pair);
5948 tree ini = DECL_INITIAL (enu);
5950 TREE_TYPE (enu) = enumtype;
5952 /* The ISO C Standard mandates enumerators to have type int,
5953 even though the underlying type of an enum type is
5954 unspecified. However, GCC allows enumerators of any
5955 integer type as an extensions. build_enumerator()
5956 converts any enumerators that fit in an int to type int,
5957 to avoid promotions to unsigned types when comparing
5958 integers with enumerators that fit in the int range.
5959 When -pedantic is given, build_enumerator() would have
5960 already warned about those that don't fit. Here we
5961 convert the rest to the enumerator type. */
5962 if (TREE_TYPE (ini) != integer_type_node)
5963 ini = convert (enumtype, ini);
5965 DECL_INITIAL (enu) = ini;
5966 TREE_PURPOSE (pair) = DECL_NAME (enu);
5967 TREE_VALUE (pair) = ini;
5970 TYPE_VALUES (enumtype) = values;
5973 /* Record the min/max values so that we can warn about bit-field
5974 enumerations that are too small for the values. */
5975 lt = GGC_CNEW (struct lang_type);
5976 lt->enum_min = minnode;
5977 lt->enum_max = maxnode;
5978 TYPE_LANG_SPECIFIC (enumtype) = lt;
5980 /* Fix up all variant types of this enum type. */
5981 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5983 if (tem == enumtype)
5985 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5986 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5987 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5988 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5989 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5990 SET_TYPE_MODE (tem, TYPE_MODE (enumtype));
5991 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5992 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5993 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5994 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5995 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5998 /* Finish debugging output for this type. */
5999 rest_of_type_compilation (enumtype, toplevel);
6004 /* Build and install a CONST_DECL for one value of the
6005 current enumeration type (one that was begun with start_enum).
6006 Return a tree-list containing the CONST_DECL and its value.
6007 Assignment of sequential values by default is handled here. */
6010 build_enumerator (struct c_enum_contents *the_enum, tree name, tree value,
6011 location_t value_loc)
6015 /* Validate and default VALUE. */
6019 /* Don't issue more errors for error_mark_node (i.e. an
6020 undeclared identifier) - just ignore the value expression. */
6021 if (value == error_mark_node)
6023 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
6024 || TREE_CODE (value) != INTEGER_CST)
6026 error ("enumerator value for %qE is not an integer constant", name);
6031 value = default_conversion (value);
6032 constant_expression_warning (value);
6036 /* Default based on previous value. */
6037 /* It should no longer be possible to have NON_LVALUE_EXPR
6041 value = the_enum->enum_next_value;
6042 if (the_enum->enum_overflow)
6043 error ("overflow in enumeration values");
6045 /* Even though the underlying type of an enum is unspecified, the
6046 type of enumeration constants is explicitly defined as int
6047 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
6049 else if (!int_fits_type_p (value, integer_type_node))
6050 pedwarn (value_loc, OPT_pedantic,
6051 "ISO C restricts enumerator values to range of %<int%>");
6053 /* The ISO C Standard mandates enumerators to have type int, even
6054 though the underlying type of an enum type is unspecified.
6055 However, GCC allows enumerators of any integer type as an
6056 extensions. Here we convert any enumerators that fit in an int
6057 to type int, to avoid promotions to unsigned types when comparing
6058 integers with enumerators that fit in the int range. When
6059 -pedantic is given, we would have already warned about those that
6060 don't fit. We have to do this here rather than in finish_enum
6061 because this value may be used to define more enumerators. */
6062 if (int_fits_type_p (value, integer_type_node))
6063 value = convert (integer_type_node, value);
6065 /* Set basis for default for next value. */
6066 the_enum->enum_next_value
6068 (EXPR_HAS_LOCATION (value) ? EXPR_LOCATION (value) : input_location,
6069 PLUS_EXPR, value, integer_one_node, 0);
6070 the_enum->enum_overflow = tree_int_cst_lt (the_enum->enum_next_value, value);
6072 /* Now create a declaration for the enum value name. */
6074 type = TREE_TYPE (value);
6075 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6076 TYPE_PRECISION (integer_type_node)),
6077 (TYPE_PRECISION (type)
6078 >= TYPE_PRECISION (integer_type_node)
6079 && TYPE_UNSIGNED (type)));
6081 decl = build_decl (CONST_DECL, name, type);
6082 DECL_INITIAL (decl) = convert (type, value);
6085 return tree_cons (decl, value, NULL_TREE);
6089 /* Create the FUNCTION_DECL for a function definition.
6090 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6091 the declaration; they describe the function's name and the type it returns,
6092 but twisted together in a fashion that parallels the syntax of C.
6094 This function creates a binding context for the function body
6095 as well as setting up the FUNCTION_DECL in current_function_decl.
6097 Returns 1 on success. If the DECLARATOR is not suitable for a function
6098 (it defines a datum instead), we return 0, which tells
6099 yyparse to report a parse error. */
6102 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6105 tree decl1, old_decl;
6106 tree restype, resdecl;
6107 struct c_label_context_se *nstack_se;
6108 struct c_label_context_vm *nstack_vm;
6110 current_function_returns_value = 0; /* Assume, until we see it does. */
6111 current_function_returns_null = 0;
6112 current_function_returns_abnormally = 0;
6113 warn_about_return_type = 0;
6114 c_switch_stack = NULL;
6116 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6117 nstack_se->labels_def = NULL;
6118 nstack_se->labels_used = NULL;
6119 nstack_se->next = label_context_stack_se;
6120 label_context_stack_se = nstack_se;
6122 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6123 nstack_vm->labels_def = NULL;
6124 nstack_vm->labels_used = NULL;
6125 nstack_vm->scope = 0;
6126 nstack_vm->next = label_context_stack_vm;
6127 label_context_stack_vm = nstack_vm;
6129 /* Indicate no valid break/continue context by setting these variables
6130 to some non-null, non-label value. We'll notice and emit the proper
6131 error message in c_finish_bc_stmt. */
6132 c_break_label = c_cont_label = size_zero_node;
6134 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL,
6135 &attributes, DEPRECATED_NORMAL);
6137 /* If the declarator is not suitable for a function definition,
6138 cause a syntax error. */
6140 || TREE_CODE (decl1) != FUNCTION_DECL)
6142 label_context_stack_se = label_context_stack_se->next;
6143 label_context_stack_vm = label_context_stack_vm->next;
6147 decl_attributes (&decl1, attributes, 0);
6149 if (DECL_DECLARED_INLINE_P (decl1)
6150 && DECL_UNINLINABLE (decl1)
6151 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6152 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6155 /* Handle gnu_inline attribute. */
6156 if (declspecs->inline_p
6157 && !flag_gnu89_inline
6158 && TREE_CODE (decl1) == FUNCTION_DECL
6159 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))
6160 || current_function_decl))
6162 if (declspecs->storage_class != csc_static)
6163 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6166 announce_function (decl1);
6168 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6170 error ("return type is an incomplete type");
6171 /* Make it return void instead. */
6173 = build_function_type (void_type_node,
6174 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6177 if (warn_about_return_type)
6178 pedwarn_c99 (input_location, flag_isoc99 ? 0
6179 : (warn_return_type ? OPT_Wreturn_type : OPT_Wimplicit_int),
6180 "return type defaults to %<int%>");
6182 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6183 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6184 DECL_INITIAL (decl1) = error_mark_node;
6186 /* If this definition isn't a prototype and we had a prototype declaration
6187 before, copy the arg type info from that prototype. */
6188 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6189 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6191 current_function_prototype_locus = UNKNOWN_LOCATION;
6192 current_function_prototype_built_in = false;
6193 current_function_prototype_arg_types = NULL_TREE;
6194 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6196 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6197 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6198 TREE_TYPE (TREE_TYPE (old_decl))))
6200 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6202 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6203 current_function_prototype_built_in
6204 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6205 current_function_prototype_arg_types
6206 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6208 if (TREE_PUBLIC (decl1))
6210 /* If there is an external prototype declaration of this
6211 function, record its location but do not copy information
6212 to this decl. This may be an invisible declaration
6213 (built-in or in a scope which has finished) or simply
6214 have more refined argument types than any declaration
6216 struct c_binding *b;
6217 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6218 if (B_IN_SCOPE (b, external_scope))
6222 tree ext_decl, ext_type;
6224 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6225 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6226 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6227 TREE_TYPE (ext_type)))
6229 current_function_prototype_locus
6230 = DECL_SOURCE_LOCATION (ext_decl);
6231 current_function_prototype_built_in
6232 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6233 current_function_prototype_arg_types
6234 = TYPE_ARG_TYPES (ext_type);
6240 /* Optionally warn of old-fashioned def with no previous prototype. */
6241 if (warn_strict_prototypes
6242 && old_decl != error_mark_node
6243 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6244 && C_DECL_ISNT_PROTOTYPE (old_decl))
6245 warning (OPT_Wstrict_prototypes,
6246 "function declaration isn%'t a prototype");
6247 /* Optionally warn of any global def with no previous prototype. */
6248 else if (warn_missing_prototypes
6249 && old_decl != error_mark_node
6250 && TREE_PUBLIC (decl1)
6251 && !MAIN_NAME_P (DECL_NAME (decl1))
6252 && C_DECL_ISNT_PROTOTYPE (old_decl))
6253 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6254 /* Optionally warn of any def with no previous prototype
6255 if the function has already been used. */
6256 else if (warn_missing_prototypes
6258 && old_decl != error_mark_node
6259 && TREE_USED (old_decl)
6260 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6261 warning (OPT_Wmissing_prototypes,
6262 "%q+D was used with no prototype before its definition", decl1);
6263 /* Optionally warn of any global def with no previous declaration. */
6264 else if (warn_missing_declarations
6265 && TREE_PUBLIC (decl1)
6267 && !MAIN_NAME_P (DECL_NAME (decl1)))
6268 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6270 /* Optionally warn of any def with no previous declaration
6271 if the function has already been used. */
6272 else if (warn_missing_declarations
6274 && old_decl != error_mark_node
6275 && TREE_USED (old_decl)
6276 && C_DECL_IMPLICIT (old_decl))
6277 warning (OPT_Wmissing_declarations,
6278 "%q+D was used with no declaration before its definition", decl1);
6280 /* This function exists in static storage.
6281 (This does not mean `static' in the C sense!) */
6282 TREE_STATIC (decl1) = 1;
6284 /* A nested function is not global. */
6285 if (current_function_decl != 0)
6286 TREE_PUBLIC (decl1) = 0;
6288 /* This is the earliest point at which we might know the assembler
6289 name of the function. Thus, if it's set before this, die horribly. */
6290 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6292 /* If #pragma weak was used, mark the decl weak now. */
6293 if (current_scope == file_scope)
6294 maybe_apply_pragma_weak (decl1);
6296 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6297 if (warn_main && MAIN_NAME_P (DECL_NAME (decl1)))
6299 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6300 != integer_type_node)
6301 pedwarn (input_location, OPT_Wmain, "return type of %q+D is not %<int%>", decl1);
6303 check_main_parameter_types (decl1);
6305 if (!TREE_PUBLIC (decl1))
6306 pedwarn (input_location, OPT_Wmain, "%q+D is normally a non-static function", decl1);
6309 /* Record the decl so that the function name is defined.
6310 If we already have a decl for this name, and it is a FUNCTION_DECL,
6311 use the old decl. */
6313 current_function_decl = pushdecl (decl1);
6316 declare_parm_level ();
6318 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6319 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6320 DECL_ARTIFICIAL (resdecl) = 1;
6321 DECL_IGNORED_P (resdecl) = 1;
6322 DECL_RESULT (current_function_decl) = resdecl;
6324 start_fname_decls ();
6329 /* Subroutine of store_parm_decls which handles new-style function
6330 definitions (prototype format). The parms already have decls, so we
6331 need only record them as in effect and complain if any redundant
6332 old-style parm decls were written. */
6334 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6338 if (current_scope->bindings)
6340 error ("%Jold-style parameter declarations in prototyped "
6341 "function definition", fndecl);
6343 /* Get rid of the old-style declarations. */
6347 /* Don't issue this warning for nested functions, and don't issue this
6348 warning if we got here because ARG_INFO_TYPES was error_mark_node
6349 (this happens when a function definition has just an ellipsis in
6350 its parameter list). */
6351 else if (!in_system_header && !current_function_scope
6352 && arg_info->types != error_mark_node)
6353 warning (OPT_Wtraditional,
6354 "%Jtraditional C rejects ISO C style function definitions",
6357 /* Now make all the parameter declarations visible in the function body.
6358 We can bypass most of the grunt work of pushdecl. */
6359 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6361 DECL_CONTEXT (decl) = current_function_decl;
6362 if (DECL_NAME (decl))
6364 bind (DECL_NAME (decl), decl, current_scope,
6365 /*invisible=*/false, /*nested=*/false);
6366 if (!TREE_USED (decl))
6367 warn_if_shadowing (decl);
6370 error ("%Jparameter name omitted", decl);
6373 /* Record the parameter list in the function declaration. */
6374 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6376 /* Now make all the ancillary declarations visible, likewise. */
6377 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6379 DECL_CONTEXT (decl) = current_function_decl;
6380 if (DECL_NAME (decl))
6381 bind (DECL_NAME (decl), decl, current_scope,
6382 /*invisible=*/false,
6383 /*nested=*/(TREE_CODE (decl) == FUNCTION_DECL));
6386 /* And all the tag declarations. */
6387 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6388 if (TREE_PURPOSE (decl))
6389 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6390 /*invisible=*/false, /*nested=*/false);
6393 /* Subroutine of store_parm_decls which handles old-style function
6394 definitions (separate parameter list and declarations). */
6397 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6399 struct c_binding *b;
6400 tree parm, decl, last;
6401 tree parmids = arg_info->parms;
6402 struct pointer_set_t *seen_args = pointer_set_create ();
6404 if (!in_system_header)
6405 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6408 /* Match each formal parameter name with its declaration. Save each
6409 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6410 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6412 if (TREE_VALUE (parm) == 0)
6414 error ("%Jparameter name missing from parameter list", fndecl);
6415 TREE_PURPOSE (parm) = 0;
6419 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6420 if (b && B_IN_CURRENT_SCOPE (b))
6423 /* If we got something other than a PARM_DECL it is an error. */
6424 if (TREE_CODE (decl) != PARM_DECL)
6425 error ("%q+D declared as a non-parameter", decl);
6426 /* If the declaration is already marked, we have a duplicate
6427 name. Complain and ignore the duplicate. */
6428 else if (pointer_set_contains (seen_args, decl))
6430 error ("multiple parameters named %q+D", decl);
6431 TREE_PURPOSE (parm) = 0;
6434 /* If the declaration says "void", complain and turn it into
6436 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6438 error ("parameter %q+D declared with void type", decl);
6439 TREE_TYPE (decl) = integer_type_node;
6440 DECL_ARG_TYPE (decl) = integer_type_node;
6441 layout_decl (decl, 0);
6443 warn_if_shadowing (decl);
6445 /* If no declaration found, default to int. */
6448 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6449 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6450 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6452 warn_if_shadowing (decl);
6455 pedwarn (input_location, 0, "type of %q+D defaults to %<int%>", decl);
6457 warning (OPT_Wmissing_parameter_type, "type of %q+D defaults to %<int%>", decl);
6460 TREE_PURPOSE (parm) = decl;
6461 pointer_set_insert (seen_args, decl);
6464 /* Now examine the parms chain for incomplete declarations
6465 and declarations with no corresponding names. */
6467 for (b = current_scope->bindings; b; b = b->prev)
6470 if (TREE_CODE (parm) != PARM_DECL)
6473 if (TREE_TYPE (parm) != error_mark_node
6474 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6476 error ("parameter %q+D has incomplete type", parm);
6477 TREE_TYPE (parm) = error_mark_node;
6480 if (!pointer_set_contains (seen_args, parm))
6482 error ("declaration for parameter %q+D but no such parameter", parm);
6484 /* Pretend the parameter was not missing.
6485 This gets us to a standard state and minimizes
6486 further error messages. */
6487 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6491 /* Chain the declarations together in the order of the list of
6492 names. Store that chain in the function decl, replacing the
6493 list of names. Update the current scope to match. */
6494 DECL_ARGUMENTS (fndecl) = 0;
6496 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6497 if (TREE_PURPOSE (parm))
6499 if (parm && TREE_PURPOSE (parm))
6501 last = TREE_PURPOSE (parm);
6502 DECL_ARGUMENTS (fndecl) = last;
6504 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6505 if (TREE_PURPOSE (parm))
6507 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6508 last = TREE_PURPOSE (parm);
6510 TREE_CHAIN (last) = 0;
6513 pointer_set_destroy (seen_args);
6515 /* If there was a previous prototype,
6516 set the DECL_ARG_TYPE of each argument according to
6517 the type previously specified, and report any mismatches. */
6519 if (current_function_prototype_arg_types)
6522 for (parm = DECL_ARGUMENTS (fndecl),
6523 type = current_function_prototype_arg_types;
6524 parm || (type && TREE_VALUE (type) != error_mark_node
6525 && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node));
6526 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6528 if (parm == 0 || type == 0
6529 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6531 if (current_function_prototype_built_in)
6532 warning (0, "number of arguments doesn%'t match "
6533 "built-in prototype");
6536 error ("number of arguments doesn%'t match prototype");
6537 error ("%Hprototype declaration",
6538 ¤t_function_prototype_locus);
6542 /* Type for passing arg must be consistent with that
6543 declared for the arg. ISO C says we take the unqualified
6544 type for parameters declared with qualified type. */
6545 if (TREE_TYPE (parm) != error_mark_node
6546 && TREE_TYPE (type) != error_mark_node
6547 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6548 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6550 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6551 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6553 /* Adjust argument to match prototype. E.g. a previous
6554 `int foo(float);' prototype causes
6555 `int foo(x) float x; {...}' to be treated like
6556 `int foo(float x) {...}'. This is particularly
6557 useful for argument types like uid_t. */
6558 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6560 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6561 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6562 && TYPE_PRECISION (TREE_TYPE (parm))
6563 < TYPE_PRECISION (integer_type_node))
6564 DECL_ARG_TYPE (parm) = integer_type_node;
6566 /* ??? Is it possible to get here with a
6567 built-in prototype or will it always have
6568 been diagnosed as conflicting with an
6569 old-style definition and discarded? */
6570 if (current_function_prototype_built_in)
6571 warning (OPT_pedantic, "promoted argument %qD "
6572 "doesn%'t match built-in prototype", parm);
6575 pedwarn (input_location, OPT_pedantic, "promoted argument %qD "
6576 "doesn%'t match prototype", parm);
6577 pedwarn (current_function_prototype_locus, OPT_pedantic,
6578 "prototype declaration");
6583 if (current_function_prototype_built_in)
6584 warning (0, "argument %qD doesn%'t match "
6585 "built-in prototype", parm);
6588 error ("argument %qD doesn%'t match prototype", parm);
6589 error ("%Hprototype declaration",
6590 ¤t_function_prototype_locus);
6595 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6598 /* Otherwise, create a prototype that would match. */
6602 tree actual = 0, last = 0, type;
6604 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6606 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6608 TREE_CHAIN (last) = type;
6613 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6615 TREE_CHAIN (last) = type;
6619 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6620 of the type of this function, but we need to avoid having this
6621 affect the types of other similarly-typed functions, so we must
6622 first force the generation of an identical (but separate) type
6623 node for the relevant function type. The new node we create
6624 will be a variant of the main variant of the original function
6627 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6629 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6633 /* Store parameter declarations passed in ARG_INFO into the current
6634 function declaration. */
6637 store_parm_decls_from (struct c_arg_info *arg_info)
6639 current_function_arg_info = arg_info;
6640 store_parm_decls ();
6643 /* Store the parameter declarations into the current function declaration.
6644 This is called after parsing the parameter declarations, before
6645 digesting the body of the function.
6647 For an old-style definition, construct a prototype out of the old-style
6648 parameter declarations and inject it into the function's type. */
6651 store_parm_decls (void)
6653 tree fndecl = current_function_decl;
6656 /* The argument information block for FNDECL. */
6657 struct c_arg_info *arg_info = current_function_arg_info;
6658 current_function_arg_info = 0;
6660 /* True if this definition is written with a prototype. Note:
6661 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6662 list in a function definition as equivalent to (void) -- an
6663 empty argument list specifies the function has no parameters,
6664 but only (void) sets up a prototype for future calls. */
6665 proto = arg_info->types != 0;
6668 store_parm_decls_newstyle (fndecl, arg_info);
6670 store_parm_decls_oldstyle (fndecl, arg_info);
6672 /* The next call to push_scope will be a function body. */
6674 next_is_function_body = true;
6676 /* Write a record describing this function definition to the prototypes
6677 file (if requested). */
6679 gen_aux_info_record (fndecl, 1, 0, proto);
6681 /* Initialize the RTL code for the function. */
6682 allocate_struct_function (fndecl, false);
6684 /* Begin the statement tree for this function. */
6685 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6687 /* ??? Insert the contents of the pending sizes list into the function
6688 to be evaluated. The only reason left to have this is
6689 void foo(int n, int array[n++])
6690 because we throw away the array type in favor of a pointer type, and
6691 thus won't naturally see the SAVE_EXPR containing the increment. All
6692 other pending sizes would be handled by gimplify_parameters. */
6695 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6696 add_stmt (TREE_VALUE (t));
6699 /* Even though we're inside a function body, we still don't want to
6700 call expand_expr to calculate the size of a variable-sized array.
6701 We haven't necessarily assigned RTL to all variables yet, so it's
6702 not safe to try to expand expressions involving them. */
6703 cfun->dont_save_pending_sizes_p = 1;
6706 /* Emit diagnostics that require gimple input for detection. Operate on
6707 FNDECL and all its nested functions. */
6710 c_gimple_diagnostics_recursively (tree fndecl)
6712 struct cgraph_node *cgn;
6713 gimple_seq body = gimple_body (fndecl);
6715 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6716 c_warn_unused_result (body);
6718 /* Notice when OpenMP structured block constraints are violated. */
6720 diagnose_omp_structured_block_errors (fndecl);
6722 /* Finalize all nested functions now. */
6723 cgn = cgraph_node (fndecl);
6724 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6725 c_gimple_diagnostics_recursively (cgn->decl);
6728 /* Finish up a function declaration and compile that function
6729 all the way to assembler language output. The free the storage
6730 for the function definition.
6732 This is called after parsing the body of the function definition. */
6735 finish_function (void)
6737 tree fndecl = current_function_decl;
6739 label_context_stack_se = label_context_stack_se->next;
6740 label_context_stack_vm = label_context_stack_vm->next;
6742 if (TREE_CODE (fndecl) == FUNCTION_DECL
6743 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6745 tree args = DECL_ARGUMENTS (fndecl);
6746 for (; args; args = TREE_CHAIN (args))
6748 tree type = TREE_TYPE (args);
6749 if (INTEGRAL_TYPE_P (type)
6750 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6751 DECL_ARG_TYPE (args) = integer_type_node;
6755 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6756 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6758 /* Must mark the RESULT_DECL as being in this function. */
6760 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6761 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6763 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted
6764 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6765 == integer_type_node && flag_isoc99)
6767 tree stmt = c_finish_return (integer_zero_node);
6768 /* Hack. We don't want the middle-end to warn that this return
6769 is unreachable, so we mark its location as special. Using
6770 UNKNOWN_LOCATION has the problem that it gets clobbered in
6771 annotate_one_with_locus. A cleaner solution might be to
6772 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6774 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6777 /* Tie off the statement tree for this function. */
6778 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6780 finish_fname_decls ();
6782 /* Complain if there's just no return statement. */
6783 if (warn_return_type
6784 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6785 && !current_function_returns_value && !current_function_returns_null
6786 /* Don't complain if we are no-return. */
6787 && !current_function_returns_abnormally
6788 /* Don't complain if we are declared noreturn. */
6789 && !TREE_THIS_VOLATILE (fndecl)
6790 /* Don't warn for main(). */
6791 && !MAIN_NAME_P (DECL_NAME (fndecl))
6792 /* Or if they didn't actually specify a return type. */
6793 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6794 /* Normally, with -Wreturn-type, flow will complain, but we might
6795 optimize out static functions. */
6796 && !TREE_PUBLIC (fndecl))
6798 warning (OPT_Wreturn_type,
6799 "no return statement in function returning non-void");
6800 TREE_NO_WARNING (fndecl) = 1;
6803 /* Store the end of the function, so that we get good line number
6804 info for the epilogue. */
6805 cfun->function_end_locus = input_location;
6807 /* Finalize the ELF visibility for the function. */
6808 c_determine_visibility (fndecl);
6810 /* For GNU C extern inline functions disregard inline limits. */
6811 if (DECL_EXTERNAL (fndecl)
6812 && DECL_DECLARED_INLINE_P (fndecl))
6813 DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
6815 /* Genericize before inlining. Delay genericizing nested functions
6816 until their parent function is genericized. Since finalizing
6817 requires GENERIC, delay that as well. */
6819 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6820 && !undef_nested_function)
6822 if (!decl_function_context (fndecl))
6824 c_genericize (fndecl);
6825 c_gimple_diagnostics_recursively (fndecl);
6827 /* ??? Objc emits functions after finalizing the compilation unit.
6828 This should be cleaned up later and this conditional removed. */
6829 if (cgraph_global_info_ready)
6831 cgraph_add_new_function (fndecl, false);
6835 cgraph_finalize_function (fndecl, false);
6839 /* Register this function with cgraph just far enough to get it
6840 added to our parent's nested function list. Handy, since the
6841 C front end doesn't have such a list. */
6842 (void) cgraph_node (fndecl);
6846 if (!decl_function_context (fndecl))
6847 undef_nested_function = false;
6849 /* We're leaving the context of this function, so zap cfun.
6850 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6851 tree_rest_of_compilation. */
6853 current_function_decl = NULL;
6856 /* Check the declarations given in a for-loop for satisfying the C99
6857 constraints. If exactly one such decl is found, return it. */
6860 check_for_loop_decls (void)
6862 struct c_binding *b;
6863 tree one_decl = NULL_TREE;
6868 static bool hint = true;
6869 /* If we get here, declarations have been used in a for loop without
6870 the C99 for loop scope. This doesn't make much sense, so don't
6872 error ("%<for%> loop initial declarations are only allowed in C99 mode");
6875 inform (input_location,
6876 "use option -std=c99 or -std=gnu99 to compile your code");
6881 /* C99 subclause 6.8.5 paragraph 3:
6883 [#3] The declaration part of a for statement shall only
6884 declare identifiers for objects having storage class auto or
6887 It isn't clear whether, in this sentence, "identifiers" binds to
6888 "shall only declare" or to "objects" - that is, whether all identifiers
6889 declared must be identifiers for objects, or whether the restriction
6890 only applies to those that are. (A question on this in comp.std.c
6891 in November 2000 received no answer.) We implement the strictest
6892 interpretation, to avoid creating an extension which later causes
6895 for (b = current_scope->bindings; b; b = b->prev)
6898 tree decl = b->decl;
6903 switch (TREE_CODE (decl))
6906 if (TREE_STATIC (decl))
6907 error ("declaration of static variable %q+D in %<for%> loop "
6908 "initial declaration", decl);
6909 else if (DECL_EXTERNAL (decl))
6910 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6911 "initial declaration", decl);
6915 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6919 error ("%<union %E%> declared in %<for%> loop initial declaration",
6923 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6927 error ("declaration of non-variable %q+D in %<for%> loop "
6928 "initial declaration", decl);
6935 return n_decls == 1 ? one_decl : NULL_TREE;
6938 /* Save and reinitialize the variables
6939 used during compilation of a C function. */
6942 c_push_function_context (void)
6944 struct language_function *p;
6945 p = GGC_NEW (struct language_function);
6948 p->base.x_stmt_tree = c_stmt_tree;
6949 p->x_break_label = c_break_label;
6950 p->x_cont_label = c_cont_label;
6951 p->x_switch_stack = c_switch_stack;
6952 p->arg_info = current_function_arg_info;
6953 p->returns_value = current_function_returns_value;
6954 p->returns_null = current_function_returns_null;
6955 p->returns_abnormally = current_function_returns_abnormally;
6956 p->warn_about_return_type = warn_about_return_type;
6958 push_function_context ();
6961 /* Restore the variables used during compilation of a C function. */
6964 c_pop_function_context (void)
6966 struct language_function *p;
6968 pop_function_context ();
6970 cfun->language = NULL;
6972 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6973 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6975 /* Stop pointing to the local nodes about to be freed. */
6976 /* But DECL_INITIAL must remain nonzero so we know this
6977 was an actual function definition. */
6978 DECL_INITIAL (current_function_decl) = error_mark_node;
6979 DECL_ARGUMENTS (current_function_decl) = 0;
6982 c_stmt_tree = p->base.x_stmt_tree;
6983 c_break_label = p->x_break_label;
6984 c_cont_label = p->x_cont_label;
6985 c_switch_stack = p->x_switch_stack;
6986 current_function_arg_info = p->arg_info;
6987 current_function_returns_value = p->returns_value;
6988 current_function_returns_null = p->returns_null;
6989 current_function_returns_abnormally = p->returns_abnormally;
6990 warn_about_return_type = p->warn_about_return_type;
6993 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6996 c_dup_lang_specific_decl (tree decl)
6998 struct lang_decl *ld;
7000 if (!DECL_LANG_SPECIFIC (decl))
7003 ld = GGC_NEW (struct lang_decl);
7004 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
7005 DECL_LANG_SPECIFIC (decl) = ld;
7008 /* The functions below are required for functionality of doing
7009 function at once processing in the C front end. Currently these
7010 functions are not called from anywhere in the C front end, but as
7011 these changes continue, that will change. */
7013 /* Returns the stmt_tree (if any) to which statements are currently
7014 being added. If there is no active statement-tree, NULL is
7018 current_stmt_tree (void)
7020 return &c_stmt_tree;
7023 /* Return the global value of T as a symbol. */
7026 identifier_global_value (tree t)
7028 struct c_binding *b;
7030 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7031 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7037 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7038 otherwise the name is found in ridpointers from RID_INDEX. */
7041 record_builtin_type (enum rid rid_index, const char *name, tree type)
7045 id = ridpointers[(int) rid_index];
7047 id = get_identifier (name);
7048 decl = build_decl (TYPE_DECL, id, type);
7050 if (debug_hooks->type_decl)
7051 debug_hooks->type_decl (decl, false);
7054 /* Build the void_list_node (void_type_node having been created). */
7056 build_void_list_node (void)
7058 tree t = build_tree_list (NULL_TREE, void_type_node);
7062 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7065 build_c_parm (struct c_declspecs *specs, tree attrs,
7066 struct c_declarator *declarator)
7068 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7071 ret->declarator = declarator;
7075 /* Return a declarator with nested attributes. TARGET is the inner
7076 declarator to which these attributes apply. ATTRS are the
7079 struct c_declarator *
7080 build_attrs_declarator (tree attrs, struct c_declarator *target)
7082 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7083 ret->kind = cdk_attrs;
7084 ret->declarator = target;
7085 ret->u.attrs = attrs;
7089 /* Return a declarator for a function with arguments specified by ARGS
7090 and return type specified by TARGET. */
7092 struct c_declarator *
7093 build_function_declarator (struct c_arg_info *args,
7094 struct c_declarator *target)
7096 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7097 ret->kind = cdk_function;
7098 ret->declarator = target;
7099 ret->u.arg_info = args;
7103 /* Return a declarator for the identifier IDENT (which may be
7104 NULL_TREE for an abstract declarator). */
7106 struct c_declarator *
7107 build_id_declarator (tree ident)
7109 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7111 ret->declarator = 0;
7113 /* Default value - may get reset to a more precise location. */
7114 ret->id_loc = input_location;
7118 /* Return something to represent absolute declarators containing a *.
7119 TARGET is the absolute declarator that the * contains.
7120 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7121 to apply to the pointer type. */
7123 struct c_declarator *
7124 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7125 struct c_declarator *target)
7129 struct c_declarator *itarget = target;
7130 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7131 if (type_quals_attrs)
7133 attrs = type_quals_attrs->attrs;
7134 quals = quals_from_declspecs (type_quals_attrs);
7135 if (attrs != NULL_TREE)
7136 itarget = build_attrs_declarator (attrs, target);
7138 ret->kind = cdk_pointer;
7139 ret->declarator = itarget;
7140 ret->u.pointer_quals = quals;
7144 /* Return a pointer to a structure for an empty list of declaration
7147 struct c_declspecs *
7148 build_null_declspecs (void)
7150 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7154 ret->typespec_word = cts_none;
7155 ret->storage_class = csc_none;
7156 ret->declspecs_seen_p = false;
7157 ret->type_seen_p = false;
7158 ret->non_sc_seen_p = false;
7159 ret->typedef_p = false;
7160 ret->tag_defined_p = false;
7161 ret->explicit_signed_p = false;
7162 ret->deprecated_p = false;
7163 ret->default_int_p = false;
7164 ret->long_p = false;
7165 ret->long_long_p = false;
7166 ret->short_p = false;
7167 ret->signed_p = false;
7168 ret->unsigned_p = false;
7169 ret->complex_p = false;
7170 ret->inline_p = false;
7171 ret->thread_p = false;
7172 ret->const_p = false;
7173 ret->volatile_p = false;
7174 ret->restrict_p = false;
7175 ret->saturating_p = false;
7179 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7182 struct c_declspecs *
7183 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7187 specs->non_sc_seen_p = true;
7188 specs->declspecs_seen_p = true;
7189 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7190 && C_IS_RESERVED_WORD (qual));
7191 i = C_RID_CODE (qual);
7195 dupe = specs->const_p;
7196 specs->const_p = true;
7199 dupe = specs->volatile_p;
7200 specs->volatile_p = true;
7203 dupe = specs->restrict_p;
7204 specs->restrict_p = true;
7209 if (dupe && !flag_isoc99)
7210 pedwarn (input_location, OPT_pedantic, "duplicate %qE", qual);
7214 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7217 struct c_declspecs *
7218 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7220 tree type = spec.spec;
7221 specs->non_sc_seen_p = true;
7222 specs->declspecs_seen_p = true;
7223 specs->type_seen_p = true;
7224 if (TREE_DEPRECATED (type))
7225 specs->deprecated_p = true;
7227 /* Handle type specifier keywords. */
7228 if (TREE_CODE (type) == IDENTIFIER_NODE
7229 && C_IS_RESERVED_WORD (type)
7230 && C_RID_CODE (type) != RID_CXX_COMPAT_WARN)
7232 enum rid i = C_RID_CODE (type);
7235 error ("two or more data types in declaration specifiers");
7238 if ((int) i <= (int) RID_LAST_MODIFIER)
7240 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7245 if (specs->long_long_p)
7247 error ("%<long long long%> is too long for GCC");
7252 if (specs->typespec_word == cts_double)
7254 error ("both %<long long%> and %<double%> in "
7255 "declaration specifiers");
7258 if (pedantic && !flag_isoc99 && !in_system_header)
7259 pedwarn (input_location, OPT_Wlong_long, "ISO C90 does not support %<long long%>");
7260 specs->long_long_p = 1;
7264 error ("both %<long%> and %<short%> in "
7265 "declaration specifiers");
7266 else if (specs->typespec_word == cts_void)
7267 error ("both %<long%> and %<void%> in "
7268 "declaration specifiers");
7269 else if (specs->typespec_word == cts_bool)
7270 error ("both %<long%> and %<_Bool%> in "
7271 "declaration specifiers");
7272 else if (specs->typespec_word == cts_char)
7273 error ("both %<long%> and %<char%> in "
7274 "declaration specifiers");
7275 else if (specs->typespec_word == cts_float)
7276 error ("both %<long%> and %<float%> in "
7277 "declaration specifiers");
7278 else if (specs->typespec_word == cts_dfloat32)
7279 error ("both %<long%> and %<_Decimal32%> in "
7280 "declaration specifiers");
7281 else if (specs->typespec_word == cts_dfloat64)
7282 error ("both %<long%> and %<_Decimal64%> in "
7283 "declaration specifiers");
7284 else if (specs->typespec_word == cts_dfloat128)
7285 error ("both %<long%> and %<_Decimal128%> in "
7286 "declaration specifiers");
7288 specs->long_p = true;
7291 dupe = specs->short_p;
7293 error ("both %<long%> and %<short%> in "
7294 "declaration specifiers");
7295 else if (specs->typespec_word == cts_void)
7296 error ("both %<short%> and %<void%> in "
7297 "declaration specifiers");
7298 else if (specs->typespec_word == cts_bool)
7299 error ("both %<short%> and %<_Bool%> in "
7300 "declaration specifiers");
7301 else if (specs->typespec_word == cts_char)
7302 error ("both %<short%> and %<char%> in "
7303 "declaration specifiers");
7304 else if (specs->typespec_word == cts_float)
7305 error ("both %<short%> and %<float%> in "
7306 "declaration specifiers");
7307 else if (specs->typespec_word == cts_double)
7308 error ("both %<short%> and %<double%> in "
7309 "declaration specifiers");
7310 else if (specs->typespec_word == cts_dfloat32)
7311 error ("both %<short%> and %<_Decimal32%> in "
7312 "declaration specifiers");
7313 else if (specs->typespec_word == cts_dfloat64)
7314 error ("both %<short%> and %<_Decimal64%> in "
7315 "declaration specifiers");
7316 else if (specs->typespec_word == cts_dfloat128)
7317 error ("both %<short%> and %<_Decimal128%> in "
7318 "declaration specifiers");
7320 specs->short_p = true;
7323 dupe = specs->signed_p;
7324 if (specs->unsigned_p)
7325 error ("both %<signed%> and %<unsigned%> in "
7326 "declaration specifiers");
7327 else if (specs->typespec_word == cts_void)
7328 error ("both %<signed%> and %<void%> in "
7329 "declaration specifiers");
7330 else if (specs->typespec_word == cts_bool)
7331 error ("both %<signed%> and %<_Bool%> in "
7332 "declaration specifiers");
7333 else if (specs->typespec_word == cts_float)
7334 error ("both %<signed%> and %<float%> in "
7335 "declaration specifiers");
7336 else if (specs->typespec_word == cts_double)
7337 error ("both %<signed%> and %<double%> in "
7338 "declaration specifiers");
7339 else if (specs->typespec_word == cts_dfloat32)
7340 error ("both %<signed%> and %<_Decimal32%> in "
7341 "declaration specifiers");
7342 else if (specs->typespec_word == cts_dfloat64)
7343 error ("both %<signed%> and %<_Decimal64%> in "
7344 "declaration specifiers");
7345 else if (specs->typespec_word == cts_dfloat128)
7346 error ("both %<signed%> and %<_Decimal128%> in "
7347 "declaration specifiers");
7349 specs->signed_p = true;
7352 dupe = specs->unsigned_p;
7353 if (specs->signed_p)
7354 error ("both %<signed%> and %<unsigned%> in "
7355 "declaration specifiers");
7356 else if (specs->typespec_word == cts_void)
7357 error ("both %<unsigned%> and %<void%> in "
7358 "declaration specifiers");
7359 else if (specs->typespec_word == cts_bool)
7360 error ("both %<unsigned%> and %<_Bool%> in "
7361 "declaration specifiers");
7362 else if (specs->typespec_word == cts_float)
7363 error ("both %<unsigned%> and %<float%> in "
7364 "declaration specifiers");
7365 else if (specs->typespec_word == cts_double)
7366 error ("both %<unsigned%> and %<double%> in "
7367 "declaration specifiers");
7368 else if (specs->typespec_word == cts_dfloat32)
7369 error ("both %<unsigned%> and %<_Decimal32%> in "
7370 "declaration specifiers");
7371 else if (specs->typespec_word == cts_dfloat64)
7372 error ("both %<unsigned%> and %<_Decimal64%> in "
7373 "declaration specifiers");
7374 else if (specs->typespec_word == cts_dfloat128)
7375 error ("both %<unsigned%> and %<_Decimal128%> in "
7376 "declaration specifiers");
7378 specs->unsigned_p = true;
7381 dupe = specs->complex_p;
7382 if (!flag_isoc99 && !in_system_header)
7383 pedwarn (input_location, OPT_pedantic, "ISO C90 does not support complex types");
7384 if (specs->typespec_word == cts_void)
7385 error ("both %<complex%> and %<void%> in "
7386 "declaration specifiers");
7387 else if (specs->typespec_word == cts_bool)
7388 error ("both %<complex%> and %<_Bool%> in "
7389 "declaration specifiers");
7390 else if (specs->typespec_word == cts_dfloat32)
7391 error ("both %<complex%> and %<_Decimal32%> in "
7392 "declaration specifiers");
7393 else if (specs->typespec_word == cts_dfloat64)
7394 error ("both %<complex%> and %<_Decimal64%> in "
7395 "declaration specifiers");
7396 else if (specs->typespec_word == cts_dfloat128)
7397 error ("both %<complex%> and %<_Decimal128%> in "
7398 "declaration specifiers");
7399 else if (specs->typespec_word == cts_fract)
7400 error ("both %<complex%> and %<_Fract%> in "
7401 "declaration specifiers");
7402 else if (specs->typespec_word == cts_accum)
7403 error ("both %<complex%> and %<_Accum%> in "
7404 "declaration specifiers");
7405 else if (specs->saturating_p)
7406 error ("both %<complex%> and %<_Sat%> in "
7407 "declaration specifiers");
7409 specs->complex_p = true;
7412 dupe = specs->saturating_p;
7413 pedwarn (input_location, OPT_pedantic, "ISO C does not support saturating types");
7414 if (specs->typespec_word == cts_void)
7415 error ("both %<_Sat%> and %<void%> in "
7416 "declaration specifiers");
7417 else if (specs->typespec_word == cts_bool)
7418 error ("both %<_Sat%> and %<_Bool%> in "
7419 "declaration specifiers");
7420 else if (specs->typespec_word == cts_char)
7421 error ("both %<_Sat%> and %<char%> in "
7422 "declaration specifiers");
7423 else if (specs->typespec_word == cts_int)
7424 error ("both %<_Sat%> and %<int%> in "
7425 "declaration specifiers");
7426 else if (specs->typespec_word == cts_float)
7427 error ("both %<_Sat%> and %<float%> in "
7428 "declaration specifiers");
7429 else if (specs->typespec_word == cts_double)
7430 error ("both %<_Sat%> and %<double%> in "
7431 "declaration specifiers");
7432 else if (specs->typespec_word == cts_dfloat32)
7433 error ("both %<_Sat%> and %<_Decimal32%> in "
7434 "declaration specifiers");
7435 else if (specs->typespec_word == cts_dfloat64)
7436 error ("both %<_Sat%> and %<_Decimal64%> in "
7437 "declaration specifiers");
7438 else if (specs->typespec_word == cts_dfloat128)
7439 error ("both %<_Sat%> and %<_Decimal128%> in "
7440 "declaration specifiers");
7441 else if (specs->complex_p)
7442 error ("both %<_Sat%> and %<complex%> in "
7443 "declaration specifiers");
7445 specs->saturating_p = true;
7452 error ("duplicate %qE", type);
7458 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7459 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7460 if (specs->typespec_word != cts_none)
7462 error ("two or more data types in declaration specifiers");
7469 error ("both %<long%> and %<void%> in "
7470 "declaration specifiers");
7471 else if (specs->short_p)
7472 error ("both %<short%> and %<void%> in "
7473 "declaration specifiers");
7474 else if (specs->signed_p)
7475 error ("both %<signed%> and %<void%> in "
7476 "declaration specifiers");
7477 else if (specs->unsigned_p)
7478 error ("both %<unsigned%> and %<void%> in "
7479 "declaration specifiers");
7480 else if (specs->complex_p)
7481 error ("both %<complex%> and %<void%> in "
7482 "declaration specifiers");
7483 else if (specs->saturating_p)
7484 error ("both %<_Sat%> and %<void%> in "
7485 "declaration specifiers");
7487 specs->typespec_word = cts_void;
7491 error ("both %<long%> and %<_Bool%> in "
7492 "declaration specifiers");
7493 else if (specs->short_p)
7494 error ("both %<short%> and %<_Bool%> in "
7495 "declaration specifiers");
7496 else if (specs->signed_p)
7497 error ("both %<signed%> and %<_Bool%> in "
7498 "declaration specifiers");
7499 else if (specs->unsigned_p)
7500 error ("both %<unsigned%> and %<_Bool%> in "
7501 "declaration specifiers");
7502 else if (specs->complex_p)
7503 error ("both %<complex%> and %<_Bool%> in "
7504 "declaration specifiers");
7505 else if (specs->saturating_p)
7506 error ("both %<_Sat%> and %<_Bool%> in "
7507 "declaration specifiers");
7509 specs->typespec_word = cts_bool;
7513 error ("both %<long%> and %<char%> in "
7514 "declaration specifiers");
7515 else if (specs->short_p)
7516 error ("both %<short%> and %<char%> in "
7517 "declaration specifiers");
7518 else if (specs->saturating_p)
7519 error ("both %<_Sat%> and %<char%> in "
7520 "declaration specifiers");
7522 specs->typespec_word = cts_char;
7525 if (specs->saturating_p)
7526 error ("both %<_Sat%> and %<int%> in "
7527 "declaration specifiers");
7529 specs->typespec_word = cts_int;
7533 error ("both %<long%> and %<float%> in "
7534 "declaration specifiers");
7535 else if (specs->short_p)
7536 error ("both %<short%> and %<float%> in "
7537 "declaration specifiers");
7538 else if (specs->signed_p)
7539 error ("both %<signed%> and %<float%> in "
7540 "declaration specifiers");
7541 else if (specs->unsigned_p)
7542 error ("both %<unsigned%> and %<float%> in "
7543 "declaration specifiers");
7544 else if (specs->saturating_p)
7545 error ("both %<_Sat%> and %<float%> in "
7546 "declaration specifiers");
7548 specs->typespec_word = cts_float;
7551 if (specs->long_long_p)
7552 error ("both %<long long%> and %<double%> in "
7553 "declaration specifiers");
7554 else if (specs->short_p)
7555 error ("both %<short%> and %<double%> in "
7556 "declaration specifiers");
7557 else if (specs->signed_p)
7558 error ("both %<signed%> and %<double%> in "
7559 "declaration specifiers");
7560 else if (specs->unsigned_p)
7561 error ("both %<unsigned%> and %<double%> in "
7562 "declaration specifiers");
7563 else if (specs->saturating_p)
7564 error ("both %<_Sat%> and %<double%> in "
7565 "declaration specifiers");
7567 specs->typespec_word = cts_double;
7574 if (i == RID_DFLOAT32)
7576 else if (i == RID_DFLOAT64)
7579 str = "_Decimal128";
7580 if (specs->long_long_p)
7581 error ("both %<long long%> and %<%s%> in "
7582 "declaration specifiers", str);
7584 error ("both %<long%> and %<%s%> in "
7585 "declaration specifiers", str);
7586 else if (specs->short_p)
7587 error ("both %<short%> and %<%s%> in "
7588 "declaration specifiers", str);
7589 else if (specs->signed_p)
7590 error ("both %<signed%> and %<%s%> in "
7591 "declaration specifiers", str);
7592 else if (specs->unsigned_p)
7593 error ("both %<unsigned%> and %<%s%> in "
7594 "declaration specifiers", str);
7595 else if (specs->complex_p)
7596 error ("both %<complex%> and %<%s%> in "
7597 "declaration specifiers", str);
7598 else if (specs->saturating_p)
7599 error ("both %<_Sat%> and %<%s%> in "
7600 "declaration specifiers", str);
7601 else if (i == RID_DFLOAT32)
7602 specs->typespec_word = cts_dfloat32;
7603 else if (i == RID_DFLOAT64)
7604 specs->typespec_word = cts_dfloat64;
7606 specs->typespec_word = cts_dfloat128;
7608 if (!targetm.decimal_float_supported_p ())
7609 error ("decimal floating point not supported for this target");
7610 pedwarn (input_location, OPT_pedantic,
7611 "ISO C does not support decimal floating point");
7621 if (specs->complex_p)
7622 error ("both %<complex%> and %<%s%> in "
7623 "declaration specifiers", str);
7624 else if (i == RID_FRACT)
7625 specs->typespec_word = cts_fract;
7627 specs->typespec_word = cts_accum;
7629 if (!targetm.fixed_point_supported_p ())
7630 error ("fixed-point types not supported for this target");
7631 pedwarn (input_location, OPT_pedantic,
7632 "ISO C does not support fixed-point types");
7635 /* ObjC reserved word "id", handled below. */
7641 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7642 form of ObjC type, cases such as "int" and "long" being handled
7643 above), a TYPE (struct, union, enum and typeof specifiers) or an
7644 ERROR_MARK. In none of these cases may there have previously
7645 been any type specifiers. */
7646 if (specs->type || specs->typespec_word != cts_none
7647 || specs->long_p || specs->short_p || specs->signed_p
7648 || specs->unsigned_p || specs->complex_p)
7649 error ("two or more data types in declaration specifiers");
7650 else if (TREE_CODE (type) == TYPE_DECL)
7652 if (TREE_TYPE (type) == error_mark_node)
7653 ; /* Allow the type to default to int to avoid cascading errors. */
7656 specs->type = TREE_TYPE (type);
7657 specs->decl_attr = DECL_ATTRIBUTES (type);
7658 specs->typedef_p = true;
7659 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7662 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7664 tree t = lookup_name (type);
7665 if (!t || TREE_CODE (t) != TYPE_DECL)
7666 error ("%qE fails to be a typedef or built in type", type);
7667 else if (TREE_TYPE (t) == error_mark_node)
7670 specs->type = TREE_TYPE (t);
7672 else if (TREE_CODE (type) != ERROR_MARK)
7674 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7675 specs->tag_defined_p = true;
7676 if (spec.kind == ctsk_typeof)
7677 specs->typedef_p = true;
7684 /* Add the storage class specifier or function specifier SCSPEC to the
7685 declaration specifiers SPECS, returning SPECS. */
7687 struct c_declspecs *
7688 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7691 enum c_storage_class n = csc_none;
7693 specs->declspecs_seen_p = true;
7694 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7695 && C_IS_RESERVED_WORD (scspec));
7696 i = C_RID_CODE (scspec);
7697 if (specs->non_sc_seen_p)
7698 warning (OPT_Wold_style_declaration,
7699 "%qE is not at beginning of declaration", scspec);
7703 /* C99 permits duplicate inline. Although of doubtful utility,
7704 it seems simplest to permit it in gnu89 mode as well, as
7705 there is also little utility in maintaining this as a
7706 difference between gnu89 and C99 inline. */
7708 specs->inline_p = true;
7711 dupe = specs->thread_p;
7712 if (specs->storage_class == csc_auto)
7713 error ("%<__thread%> used with %<auto%>");
7714 else if (specs->storage_class == csc_register)
7715 error ("%<__thread%> used with %<register%>");
7716 else if (specs->storage_class == csc_typedef)
7717 error ("%<__thread%> used with %<typedef%>");
7719 specs->thread_p = true;
7726 /* Diagnose "__thread extern". */
7727 if (specs->thread_p)
7728 error ("%<__thread%> before %<extern%>");
7735 /* Diagnose "__thread static". */
7736 if (specs->thread_p)
7737 error ("%<__thread%> before %<static%>");
7745 if (n != csc_none && n == specs->storage_class)
7748 error ("duplicate %qE", scspec);
7751 if (specs->storage_class != csc_none && n != specs->storage_class)
7753 error ("multiple storage classes in declaration specifiers");
7757 specs->storage_class = n;
7758 if (n != csc_extern && n != csc_static && specs->thread_p)
7760 error ("%<__thread%> used with %qE", scspec);
7761 specs->thread_p = false;
7768 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7771 struct c_declspecs *
7772 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7774 specs->attrs = chainon (attrs, specs->attrs);
7775 specs->declspecs_seen_p = true;
7779 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7780 specifiers with any other type specifier to determine the resulting
7781 type. This is where ISO C checks on complex types are made, since
7782 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7785 struct c_declspecs *
7786 finish_declspecs (struct c_declspecs *specs)
7788 /* If a type was specified as a whole, we have no modifiers and are
7790 if (specs->type != NULL_TREE)
7792 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7793 && !specs->signed_p && !specs->unsigned_p
7794 && !specs->complex_p);
7798 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7799 has been specified, treat it as "int" unless "_Complex" is
7800 present and there are no other specifiers. If we just have
7801 "_Complex", it is equivalent to "_Complex double", but e.g.
7802 "_Complex short" is equivalent to "_Complex short int". */
7803 if (specs->typespec_word == cts_none)
7805 if (specs->saturating_p)
7807 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7808 if (!targetm.fixed_point_supported_p ())
7809 error ("fixed-point types not supported for this target");
7810 specs->typespec_word = cts_fract;
7812 else if (specs->long_p || specs->short_p
7813 || specs->signed_p || specs->unsigned_p)
7815 specs->typespec_word = cts_int;
7817 else if (specs->complex_p)
7819 specs->typespec_word = cts_double;
7820 pedwarn (input_location, OPT_pedantic,
7821 "ISO C does not support plain %<complex%> meaning "
7822 "%<double complex%>");
7826 specs->typespec_word = cts_int;
7827 specs->default_int_p = true;
7828 /* We don't diagnose this here because grokdeclarator will
7829 give more specific diagnostics according to whether it is
7830 a function definition. */
7834 /* If "signed" was specified, record this to distinguish "int" and
7835 "signed int" in the case of a bit-field with
7836 -funsigned-bitfields. */
7837 specs->explicit_signed_p = specs->signed_p;
7839 /* Now compute the actual type. */
7840 switch (specs->typespec_word)
7843 gcc_assert (!specs->long_p && !specs->short_p
7844 && !specs->signed_p && !specs->unsigned_p
7845 && !specs->complex_p);
7846 specs->type = void_type_node;
7849 gcc_assert (!specs->long_p && !specs->short_p
7850 && !specs->signed_p && !specs->unsigned_p
7851 && !specs->complex_p);
7852 specs->type = boolean_type_node;
7855 gcc_assert (!specs->long_p && !specs->short_p);
7856 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7857 if (specs->signed_p)
7858 specs->type = signed_char_type_node;
7859 else if (specs->unsigned_p)
7860 specs->type = unsigned_char_type_node;
7862 specs->type = char_type_node;
7863 if (specs->complex_p)
7865 pedwarn (input_location, OPT_pedantic,
7866 "ISO C does not support complex integer types");
7867 specs->type = build_complex_type (specs->type);
7871 gcc_assert (!(specs->long_p && specs->short_p));
7872 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7873 if (specs->long_long_p)
7874 specs->type = (specs->unsigned_p
7875 ? long_long_unsigned_type_node
7876 : long_long_integer_type_node);
7877 else if (specs->long_p)
7878 specs->type = (specs->unsigned_p
7879 ? long_unsigned_type_node
7880 : long_integer_type_node);
7881 else if (specs->short_p)
7882 specs->type = (specs->unsigned_p
7883 ? short_unsigned_type_node
7884 : short_integer_type_node);
7886 specs->type = (specs->unsigned_p
7887 ? unsigned_type_node
7888 : integer_type_node);
7889 if (specs->complex_p)
7891 pedwarn (input_location, OPT_pedantic,
7892 "ISO C does not support complex integer types");
7893 specs->type = build_complex_type (specs->type);
7897 gcc_assert (!specs->long_p && !specs->short_p
7898 && !specs->signed_p && !specs->unsigned_p);
7899 specs->type = (specs->complex_p
7900 ? complex_float_type_node
7904 gcc_assert (!specs->long_long_p && !specs->short_p
7905 && !specs->signed_p && !specs->unsigned_p);
7908 specs->type = (specs->complex_p
7909 ? complex_long_double_type_node
7910 : long_double_type_node);
7914 specs->type = (specs->complex_p
7915 ? complex_double_type_node
7916 : double_type_node);
7922 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7923 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7924 if (specs->typespec_word == cts_dfloat32)
7925 specs->type = dfloat32_type_node;
7926 else if (specs->typespec_word == cts_dfloat64)
7927 specs->type = dfloat64_type_node;
7929 specs->type = dfloat128_type_node;
7932 gcc_assert (!specs->complex_p);
7933 if (!targetm.fixed_point_supported_p ())
7934 specs->type = integer_type_node;
7935 else if (specs->saturating_p)
7937 if (specs->long_long_p)
7938 specs->type = specs->unsigned_p
7939 ? sat_unsigned_long_long_fract_type_node
7940 : sat_long_long_fract_type_node;
7941 else if (specs->long_p)
7942 specs->type = specs->unsigned_p
7943 ? sat_unsigned_long_fract_type_node
7944 : sat_long_fract_type_node;
7945 else if (specs->short_p)
7946 specs->type = specs->unsigned_p
7947 ? sat_unsigned_short_fract_type_node
7948 : sat_short_fract_type_node;
7950 specs->type = specs->unsigned_p
7951 ? sat_unsigned_fract_type_node
7952 : sat_fract_type_node;
7956 if (specs->long_long_p)
7957 specs->type = specs->unsigned_p
7958 ? unsigned_long_long_fract_type_node
7959 : long_long_fract_type_node;
7960 else if (specs->long_p)
7961 specs->type = specs->unsigned_p
7962 ? unsigned_long_fract_type_node
7963 : long_fract_type_node;
7964 else if (specs->short_p)
7965 specs->type = specs->unsigned_p
7966 ? unsigned_short_fract_type_node
7967 : short_fract_type_node;
7969 specs->type = specs->unsigned_p
7970 ? unsigned_fract_type_node
7975 gcc_assert (!specs->complex_p);
7976 if (!targetm.fixed_point_supported_p ())
7977 specs->type = integer_type_node;
7978 else if (specs->saturating_p)
7980 if (specs->long_long_p)
7981 specs->type = specs->unsigned_p
7982 ? sat_unsigned_long_long_accum_type_node
7983 : sat_long_long_accum_type_node;
7984 else if (specs->long_p)
7985 specs->type = specs->unsigned_p
7986 ? sat_unsigned_long_accum_type_node
7987 : sat_long_accum_type_node;
7988 else if (specs->short_p)
7989 specs->type = specs->unsigned_p
7990 ? sat_unsigned_short_accum_type_node
7991 : sat_short_accum_type_node;
7993 specs->type = specs->unsigned_p
7994 ? sat_unsigned_accum_type_node
7995 : sat_accum_type_node;
7999 if (specs->long_long_p)
8000 specs->type = specs->unsigned_p
8001 ? unsigned_long_long_accum_type_node
8002 : long_long_accum_type_node;
8003 else if (specs->long_p)
8004 specs->type = specs->unsigned_p
8005 ? unsigned_long_accum_type_node
8006 : long_accum_type_node;
8007 else if (specs->short_p)
8008 specs->type = specs->unsigned_p
8009 ? unsigned_short_accum_type_node
8010 : short_accum_type_node;
8012 specs->type = specs->unsigned_p
8013 ? unsigned_accum_type_node
8024 /* A subroutine of c_write_global_declarations. Perform final processing
8025 on one file scope's declarations (or the external scope's declarations),
8029 c_write_global_declarations_1 (tree globals)
8034 /* Process the decls in the order they were written. */
8035 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8037 /* Check for used but undefined static functions using the C
8038 standard's definition of "used", and set TREE_NO_WARNING so
8039 that check_global_declarations doesn't repeat the check. */
8040 if (TREE_CODE (decl) == FUNCTION_DECL
8041 && DECL_INITIAL (decl) == 0
8042 && DECL_EXTERNAL (decl)
8043 && !TREE_PUBLIC (decl)
8044 && C_DECL_USED (decl))
8046 pedwarn (input_location, 0, "%q+F used but never defined", decl);
8047 TREE_NO_WARNING (decl) = 1;
8050 wrapup_global_declaration_1 (decl);
8056 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8057 reconsider |= wrapup_global_declaration_2 (decl);
8061 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8062 check_global_declaration_1 (decl);
8065 /* A subroutine of c_write_global_declarations Emit debug information for each
8066 of the declarations in GLOBALS. */
8069 c_write_global_declarations_2 (tree globals)
8073 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
8074 debug_hooks->global_decl (decl);
8077 /* Preserve the external declarations scope across a garbage collect. */
8078 static GTY(()) tree ext_block;
8081 c_write_global_declarations (void)
8085 /* We don't want to do this if generating a PCH. */
8089 /* Don't waste time on further processing if -fsyntax-only or we've
8090 encountered errors. */
8091 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
8094 /* Close the external scope. */
8095 ext_block = pop_scope ();
8097 gcc_assert (!current_scope);
8101 tree tmp = BLOCK_VARS (ext_block);
8103 FILE * stream = dump_begin (TDI_tu, &flags);
8106 dump_node (tmp, flags & ~TDF_SLIM, stream);
8107 dump_end (TDI_tu, stream);
8111 /* Process all file scopes in this compilation, and the external_scope,
8112 through wrapup_global_declarations and check_global_declarations. */
8113 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8114 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8115 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8117 /* We're done parsing; proceed to optimize and emit assembly.
8118 FIXME: shouldn't be the front end's responsibility to call this. */
8121 /* After cgraph has had a chance to emit everything that's going to
8122 be emitted, output debug information for globals. */
8123 if (errorcount == 0 && sorrycount == 0)
8125 timevar_push (TV_SYMOUT);
8126 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8127 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8128 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8129 timevar_pop (TV_SYMOUT);
8135 #include "gt-c-decl.h"