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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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"
35 #include "tree-inline.h"
56 #include "langhooks-def.h"
58 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
60 { NORMAL, /* Ordinary declaration */
61 FUNCDEF, /* Function definition */
62 PARM, /* Declaration of parm before function body */
63 FIELD, /* Declaration inside struct or union */
64 TYPENAME}; /* Typename (inside cast or sizeof) */
67 /* Nonzero if we have seen an invalid cross reference
68 to a struct, union, or enum, but not yet printed the message. */
70 tree pending_invalid_xref;
71 /* File and line to appear in the eventual error message. */
72 location_t pending_invalid_xref_location;
74 /* While defining an enum type, this is 1 plus the last enumerator
75 constant value. Note that will do not have to save this or `enum_overflow'
76 around nested function definition since such a definition could only
77 occur in an enum value expression and we don't use these variables in
80 static tree enum_next_value;
82 /* Nonzero means that there was overflow computing enum_next_value. */
84 static int enum_overflow;
86 /* Parsing a function declarator leaves a list of parameter names
87 or a chain of parameter decls here. */
89 static tree last_function_parms;
91 /* ... and a chain of structure and enum types declared in the
94 static tree last_function_parm_tags;
96 /* ... and a chain of all non-parameter declarations (such as
97 CONST_DECLs from enumerations) here. */
99 static tree last_function_parm_others;
101 /* After parsing the declarator that starts a function definition,
102 `start_function' puts the list of parameter names or chain of decls here
103 for `store_parm_decls' to find. */
105 static tree current_function_parms;
107 /* Similar, for last_function_parm_tags. */
109 static tree current_function_parm_tags;
111 /* And for last_function_parm_others. */
113 static tree current_function_parm_others;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
118 static location_t current_function_prototype_locus;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* The current scope statement stack. */
126 static GTY(()) tree c_scope_stmt_stack;
128 /* State saving variables. */
129 int c_in_iteration_stmt;
132 /* A list of external DECLs that appeared at block scope when there was
133 some other global meaning for that identifier. */
134 static GTY(()) tree truly_local_externals;
136 /* All the builtins; this is a subset of the entries of global_scope. */
138 static GTY(()) tree first_builtin_decl;
139 static GTY(()) tree last_builtin_decl;
141 /* A DECL for the current file-scope context. */
143 static GTY(()) tree current_file_decl;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a return statement that specifies a return value is seen. */
148 int current_function_returns_value;
150 /* Set to 0 at beginning of a function definition, set to 1 if
151 a return statement with no argument is seen. */
153 int current_function_returns_null;
155 /* Set to 0 at beginning of a function definition, set to 1 if
156 a call to a noreturn function is seen. */
158 int current_function_returns_abnormally;
160 /* Set to nonzero by `grokdeclarator' for a function
161 whose return type is defaulted, if warnings for this are desired. */
163 static int warn_about_return_type;
165 /* Nonzero when starting a function declared `extern inline'. */
167 static int current_extern_inline;
169 /* Each c_scope structure describes the complete contents of one scope.
170 Three scopes are distinguished specially: the innermost or current
171 scope, the innermost function scope, and the outermost or file scope.
173 Most declarations are recorded in the current scope.
175 All normal label declarations are recorded in the innermost
176 function scope, as are bindings of undeclared identifiers to
177 error_mark_node. (GCC permits nested functions as an extension,
178 hence the 'innermost' qualifier.) Explicitly declared labels
179 (using the __label__ extension) appear in the current scope.
181 Being in the global scope (current_scope == global_scope) causes
182 special behavior in several places below. Also, under some
183 conditions the Objective-C front end records declarations in the
184 global scope even though that isn't the current scope.
186 The order of the names, parms, and blocks lists matters, and they
187 are frequently appended to. To avoid having to walk all the way to
188 the end of the list on each insertion, or reverse the lists later,
189 we maintain a pointer to the last list entry for each of the lists.
191 The order of the tags, shadowed, and shadowed_tags
192 lists does not matter, so we just prepend to these lists. */
194 struct c_scope GTY(())
196 /* The scope containing this one. */
197 struct c_scope *outer;
199 /* The next outermost function scope. */
200 struct c_scope *outer_function;
202 /* All variables, constants, functions, labels, and typedef names. */
206 /* All parameter declarations. Used only in the outermost scope of
211 /* All structure, union, and enum type tags. */
214 /* For each scope, a list of shadowed outer-scope definitions
215 to be restored when this scope is popped.
216 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
217 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
220 /* For each scope, a list of shadowed outer-scope tag definitions
221 to be restored when this scope is popped.
222 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
223 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
226 /* For each scope (except the global one), a chain of BLOCK nodes
227 for all the scopes that were entered and exited one level down. */
231 /* True if we are currently filling this scope with parameter
233 BOOL_BITFIELD parm_flag : 1;
235 /* True if we already complained about forward parameter decls
236 in this scope. This prevents double warnings on
237 foo (int a; int b; ...) */
238 BOOL_BITFIELD warned_forward_parm_decls : 1;
240 /* True if this is the outermost block scope of a function body.
241 This scope contains the parameters, the local variables declared
242 in the outermost block, and all the labels (except those in
243 nested functions, or declared at block scope with __label__). */
244 BOOL_BITFIELD function_body : 1;
246 /* True means make a BLOCK for this scope no matter what. */
247 BOOL_BITFIELD keep : 1;
250 /* The scope currently in effect. */
252 static GTY(()) struct c_scope *current_scope;
254 /* A chain of c_scope structures awaiting reuse. */
256 static GTY((deletable (""))) struct c_scope *scope_freelist;
258 /* The innermost function scope. Ordinary (not explicitly declared)
259 labels, bindings to error_mark_node, and the lazily-created
260 bindings of __func__ and its friends get this scope. */
262 static GTY(()) struct c_scope *current_function_scope;
264 /* The outermost scope, corresponding to the C "file scope". This is
265 created when the compiler is started and exists through the entire run. */
267 static GTY(()) struct c_scope *global_scope;
269 /* Append VAR to LIST in scope SCOPE. */
270 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
271 struct c_scope *s_ = (scope); \
273 if (s_->list##_last) \
274 TREE_CHAIN (s_->list##_last) = d_; \
277 s_->list##_last = d_; \
280 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
281 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
282 struct c_scope *t_ = (tscope); \
283 struct c_scope *f_ = (fscope); \
285 TREE_CHAIN (t_->to##_last) = f_->from; \
288 t_->to##_last = f_->from##_last; \
291 /* True means unconditionally make a BLOCK for the next scope pushed. */
293 static bool keep_next_level_flag;
295 /* True means the next call to pushlevel will be the outermost scope
296 of a function body, so do not push a new scope, merely cease
297 expecting parameter decls. */
299 static bool next_is_function_body;
301 /* Functions called automatically at the beginning and end of execution. */
303 tree static_ctors, static_dtors;
305 /* Forward declarations. */
307 static struct c_scope *make_scope (void);
308 static void pop_scope (void);
309 static tree make_label (tree, location_t);
310 static void bind_label (tree, tree, struct c_scope *);
311 static void implicit_decl_warning (tree);
312 static tree lookup_tag (enum tree_code, tree, int);
313 static tree lookup_name_current_level (tree);
314 static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
315 static tree grokparms (tree, int);
316 static void layout_array_type (tree);
317 static void store_parm_decls_newstyle (void);
318 static void store_parm_decls_oldstyle (void);
319 static tree c_make_fname_decl (tree, int);
320 static void c_expand_body_1 (tree, int);
321 static tree any_external_decl (tree);
322 static void record_external_decl (tree);
323 static void warn_if_shadowing (tree, tree);
324 static void check_bitfield_type_and_width (tree *, tree *, const char *);
325 static void clone_underlying_type (tree);
326 static bool flexible_array_type_p (tree);
327 static hashval_t link_hash_hash (const void *);
328 static int link_hash_eq (const void *, const void *);
330 /* States indicating how grokdeclarator() should handle declspecs marked
331 with __attribute__((deprecated)). An object declared as
332 __attribute__((deprecated)) suppresses warnings of uses of other
335 enum deprecated_states {
340 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
343 c_print_identifier (FILE *file, tree node, int indent)
345 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
346 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
347 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
348 if (C_IS_RESERVED_WORD (node))
350 tree rid = ridpointers[C_RID_CODE (node)];
351 indent_to (file, indent + 4);
352 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
353 (void *) rid, IDENTIFIER_POINTER (rid));
357 /* Hook called at end of compilation to assume 1 elt
358 for a file-scope tentative array defn that wasn't complete before. */
361 c_finish_incomplete_decl (tree decl)
363 if (TREE_CODE (decl) == VAR_DECL)
365 tree type = TREE_TYPE (decl);
366 if (type != error_mark_node
367 && TREE_CODE (type) == ARRAY_TYPE
368 && ! DECL_EXTERNAL (decl)
369 && TYPE_DOMAIN (type) == 0)
371 warning ("%Jarray '%D' assumed to have one element", decl, decl);
373 complete_array_type (type, NULL_TREE, 1);
375 layout_decl (decl, 0);
380 /* Reuse or create a struct for this scope. */
382 static struct c_scope *
385 struct c_scope *result;
388 result = scope_freelist;
389 scope_freelist = result->outer;
392 result = ggc_alloc_cleared (sizeof (struct c_scope));
397 /* Remove the topmost scope from the stack and add it to the
398 free list, updating current_function_scope if necessary. */
403 struct c_scope *scope = current_scope;
405 current_scope = scope->outer;
406 if (scope->function_body)
407 current_function_scope = scope->outer_function;
409 memset (scope, 0, sizeof (struct c_scope));
410 scope->outer = scope_freelist;
411 scope_freelist = scope;
414 /* The Objective-C front-end often needs to determine the current scope. */
417 get_current_scope (void)
419 return current_scope;
422 /* The following function is used only by Objective-C. It needs to live here
423 because it accesses the innards of c_scope. */
426 objc_mark_locals_volatile (void *enclosing_blk)
428 struct c_scope *scope;
430 for (scope = current_scope;
431 scope && scope != enclosing_blk;
432 scope = scope->outer)
436 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
438 DECL_REGISTER (decl) = 0;
439 TREE_THIS_VOLATILE (decl) = 1;
441 /* Do not climb up past the current function. */
442 if (scope->function_body)
447 /* Nonzero if we are currently in the global scope. */
450 global_bindings_p (void)
452 return current_scope == global_scope;
456 keep_next_level (void)
458 keep_next_level_flag = true;
461 /* Identify this scope as currently being filled with parameters. */
464 declare_parm_level (void)
466 current_scope->parm_flag = true;
469 /* Nonzero if currently making parm declarations. */
472 in_parm_level_p (void)
474 return current_scope->parm_flag;
477 /* Enter a new scope. The dummy parameter is for signature
478 compatibility with lang_hooks.decls.pushlevel. */
481 pushlevel (int dummy ATTRIBUTE_UNUSED)
483 if (next_is_function_body)
485 /* This is the transition from the parameters to the top level
486 of the function body. These are the same scope
487 (C99 6.2.1p4,6) so we do not push another scope structure.
488 next_is_function_body is set only by store_parm_decls, which
489 in turn is called when and only when we are about to
490 encounter the opening curly brace for the function body.
492 The outermost block of a function always gets a BLOCK node,
493 because the debugging output routines expect that each
494 function has at least one BLOCK. */
495 current_scope->parm_flag = false;
496 current_scope->function_body = true;
497 current_scope->keep = true;
498 current_scope->outer_function = current_function_scope;
499 current_function_scope = current_scope;
501 keep_next_level_flag = false;
502 next_is_function_body = false;
506 struct c_scope *scope = make_scope ();
508 scope->keep = keep_next_level_flag;
509 scope->outer = current_scope;
510 current_scope = scope;
511 keep_next_level_flag = false;
515 /* Exit a scope. Restore the state of the identifier-decl mappings
516 that were in effect when this scope was entered.
518 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
519 create a BLOCK node to record its declarations and subblocks for
520 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
521 or tags lists are nonempty.
523 The second parameter is ignored; it is present only for
524 signature compatibility with lang_hooks.decls.poplevel.
526 If FUNCTIONBODY is nonzero, this level is the body of a function,
527 even if current_scope->function_body is not set. This is used
528 by language-independent code that generates synthetic functions,
529 and cannot set current_scope->function_body.
531 FIXME: Eliminate the need for all arguments. */
534 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
536 struct c_scope *scope = current_scope;
541 /* The following line does not use |= due to a bug in HP's C compiler. */
542 scope->function_body = scope->function_body | functionbody;
544 if (keep == KEEP_MAYBE)
545 keep = (scope->names || scope->tags);
548 keep |= scope->function_body;
550 /* If appropriate, create a BLOCK to record the decls for the life
555 block = make_node (BLOCK);
556 BLOCK_VARS (block) = scope->names;
557 BLOCK_SUBBLOCKS (block) = scope->blocks;
558 TREE_USED (block) = 1;
561 /* In each subblock, record that this is its superior. */
562 for (p = scope->blocks; p; p = TREE_CHAIN (p))
563 BLOCK_SUPERCONTEXT (p) = block;
565 /* Clear out the variable bindings in this scope.
567 Propagate TREE_ADDRESSABLE from nested functions to their
568 containing functions.
570 Issue warnings for unused variables and labels, and errors for
571 undefined labels, if there are any. */
573 for (p = scope->names; p; p = TREE_CHAIN (p))
575 switch (TREE_CODE (p))
578 if (TREE_USED (p) && !DECL_INITIAL (p))
580 error ("%Jlabel `%D' used but not defined", p, p);
581 DECL_INITIAL (p) = error_mark_node;
583 else if (!TREE_USED (p) && warn_unused_label)
585 if (DECL_INITIAL (p))
586 warning ("%Jlabel `%D' defined but not used", p, p);
588 warning ("%Jlabel `%D' declared but not defined", p, p);
591 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
595 if (! TREE_ASM_WRITTEN (p)
596 && DECL_INITIAL (p) != 0
597 && TREE_ADDRESSABLE (p)
598 && DECL_ABSTRACT_ORIGIN (p) != 0
599 && DECL_ABSTRACT_ORIGIN (p) != p)
600 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
604 /* Keep this in sync with stmt.c:warn_about_unused_variables.
605 No warnings when the global scope is popped because the
606 global scope isn't popped for the last translation unit,
607 so the warnings are done in c_write_global_declaration. */
608 if (warn_unused_variable && scope != global_scope
610 && !DECL_IN_SYSTEM_HEADER (p)
612 && !DECL_ARTIFICIAL (p))
613 warning ("%Junused variable `%D'", p, p);
620 if (DECL_EXTERNAL (p) && scope != global_scope)
621 /* External decls stay in the symbol-value slot but are
623 C_DECL_INVISIBLE (p) = 1;
625 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
631 /* Clear out the parameter bindings in this scope, if any.
632 Unused-parameter warnings are handled by function.c. */
633 for (p = scope->parms; p; p = TREE_CHAIN (p))
635 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
637 /* Clear out the tag-meanings declared in this scope.
639 Set the TYPE_CONTEXTs for all of the tagged types belonging to
640 this scope so that they point to the appropriate construct, i.e.
641 either to the current FUNCTION_DECL node, or else to the BLOCK
642 node we just constructed.
644 Note that for tagged types whose scope is just the formal
645 parameter list for some function type specification, we can't
646 properly set their TYPE_CONTEXTs here, because we don't have a
647 pointer to the appropriate FUNCTION_TYPE node readily available
648 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
649 type nodes get set in `grokdeclarator' as soon as we have created
650 the FUNCTION_TYPE node which will represent the "scope" for these
651 "parameter list local" tagged types. */
653 decl = scope->function_body ? current_function_decl : block;
654 for (p = scope->tags; p; p = TREE_CHAIN (p))
656 if (TREE_PURPOSE (p))
657 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
659 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
662 /* Restore all name- and label-meanings from outer scopes that were
663 shadowed by this scope. */
664 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
665 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
666 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
668 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
670 /* Restore all tag-meanings from outer scopes that were shadowed by
672 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
673 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
675 /* Dispose of the block that we just made inside some higher level. */
676 if (scope->function_body && current_function_decl)
677 DECL_INITIAL (current_function_decl) = block;
678 else if (scope->outer)
681 SCOPE_LIST_APPEND (scope->outer, blocks, block);
682 /* If we did not make a block for the scope just exited, any
683 blocks made for inner scopes must be carried forward so they
684 will later become subblocks of something else. */
685 else if (scope->blocks)
686 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
689 /* Pop the current scope, and free the structure for reuse. */
695 /* Insert BLOCK at the end of the list of subblocks of the current
696 scope. This is used when a BIND_EXPR is expanded, to handle the
697 BLOCK node inside the BIND_EXPR. */
700 insert_block (tree block)
702 TREE_USED (block) = 1;
703 SCOPE_LIST_APPEND (current_scope, blocks, block);
706 /* Set the BLOCK node for the innermost scope (the one we are
707 currently in). The RTL expansion machinery requires us to provide
708 this hook, but it is not useful in function-at-a-time mode. */
711 set_block (tree block ATTRIBUTE_UNUSED)
715 /* Push a definition or a declaration of struct, union or enum tag "name".
716 "type" should be the type node.
717 We assume that the tag "name" is not already defined.
719 Note that the definition may really be just a forward reference.
720 In that case, the TYPE_SIZE will be zero. */
723 pushtag (tree name, tree type)
725 struct c_scope *b = current_scope;
727 /* Record the identifier as the type's name if it has none. */
730 if (TYPE_NAME (type) == 0)
731 TYPE_NAME (type) = name;
733 if (IDENTIFIER_TAG_VALUE (name))
734 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
736 IDENTIFIER_TAG_VALUE (name) = type;
739 b->tags = tree_cons (name, type, b->tags);
741 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
742 tagged type we just added to the current scope. This fake
743 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
744 to output a representation of a tagged type, and it also gives
745 us a convenient place to record the "scope start" address for the
748 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
750 /* An approximation for now, so we can tell this is a function-scope tag.
751 This will be updated in poplevel. */
752 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
755 /* Subroutine of compare_decls. Allow harmless mismatches in return
756 and argument types provided that the type modes match. This function
757 return a unified type given a suitable match, and 0 otherwise. */
760 match_builtin_function_types (tree newtype, tree oldtype)
762 tree newrettype, oldrettype;
763 tree newargs, oldargs;
764 tree trytype, tryargs;
766 /* Accept the return type of the new declaration if same modes. */
767 oldrettype = TREE_TYPE (oldtype);
768 newrettype = TREE_TYPE (newtype);
770 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
773 oldargs = TYPE_ARG_TYPES (oldtype);
774 newargs = TYPE_ARG_TYPES (newtype);
777 while (oldargs || newargs)
781 || ! TREE_VALUE (oldargs)
782 || ! TREE_VALUE (newargs)
783 || TYPE_MODE (TREE_VALUE (oldargs))
784 != TYPE_MODE (TREE_VALUE (newargs)))
787 oldargs = TREE_CHAIN (oldargs);
788 newargs = TREE_CHAIN (newargs);
791 trytype = build_function_type (newrettype, tryargs);
792 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
795 /* Subroutine of diagnose_mismatched_decls. Check for function type
796 mismatch involving an empty arglist vs a nonempty one and give clearer
799 diagnose_arglist_conflict (tree newdecl, tree olddecl,
800 tree newtype, tree oldtype)
804 if (TREE_CODE (olddecl) != FUNCTION_DECL
805 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype), COMPARE_STRICT)
806 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
808 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
811 t = TYPE_ARG_TYPES (oldtype);
813 t = TYPE_ARG_TYPES (newtype);
814 for (; t; t = TREE_CHAIN (t))
816 tree type = TREE_VALUE (t);
818 if (TREE_CHAIN (t) == 0
819 && TYPE_MAIN_VARIANT (type) != void_type_node)
821 inform ("a parameter list with an ellipsis can't match "
822 "an empty parameter name list declaration");
826 if (c_type_promotes_to (type) != type)
828 inform ("an argument type that has a default promotion can't match "
829 "an empty parameter name list declaration");
835 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
836 old-style function definition, NEWDECL is a prototype declaration.
837 Diagnose inconsistencies in the argument list. Returns TRUE if
838 the prototype is compatible, FALSE if not. */
840 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
842 tree newargs, oldargs;
845 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
846 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
848 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
849 newargs = TYPE_ARG_TYPES (newtype);
854 tree oldargtype = TREE_VALUE (oldargs);
855 tree newargtype = TREE_VALUE (newargs);
857 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
860 /* Reaching the end of just one list means the two decls don't
861 agree on the number of arguments. */
862 if (END_OF_ARGLIST (oldargtype))
864 error ("%Jprototype for '%D' declares more arguments "
865 "than previous old-style definition", newdecl, newdecl);
868 else if (END_OF_ARGLIST (newargtype))
870 error ("%Jprototype for '%D' declares fewer arguments "
871 "than previous old-style definition", newdecl, newdecl);
875 /* Type for passing arg must be consistent with that declared
877 else if (! comptypes (oldargtype, newargtype, COMPARE_STRICT))
879 error ("%Jprototype for '%D' declares arg %d with incompatible type",
880 newdecl, newdecl, i);
884 oldargs = TREE_CHAIN (oldargs);
885 newargs = TREE_CHAIN (newargs);
889 /* If we get here, no errors were found, but do issue a warning
890 for this poor-style construct. */
891 warning ("%Jprototype for '%D' follows non-prototype definition",
894 #undef END_OF_ARGLIST
897 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
898 first in a pair of mismatched declarations, using the diagnostic
901 locate_old_decl (tree decl, void (*diag)(const char *, ...))
903 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
905 else if (DECL_INITIAL (decl))
906 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
907 else if (C_DECL_IMPLICIT (decl))
908 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
910 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
913 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
914 Returns true if the caller should proceed to merge the two, false
915 if OLDDECL should simply be discarded. As a side effect, issues
916 all necessary diagnostics for invalid or poor-style combinations.
917 If it returns true, writes the types of NEWDECL and OLDDECL to
918 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
919 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
922 diagnose_mismatched_decls (tree newdecl, tree olddecl,
923 tree *newtypep, tree *oldtypep)
925 tree newtype, oldtype;
926 bool pedwarned = false;
929 /* If we have error_mark_node for either decl or type, just discard
930 the previous decl - we're in an error cascade already. */
931 if (olddecl == error_mark_node || newdecl == error_mark_node)
933 *oldtypep = oldtype = TREE_TYPE (olddecl);
934 *newtypep = newtype = TREE_TYPE (newdecl);
935 if (oldtype == error_mark_node || newtype == error_mark_node)
938 /* Two different categories of symbol altogether. This is an error
939 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
940 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
942 if (TREE_CODE (olddecl) != FUNCTION_DECL
943 || !DECL_BUILT_IN (olddecl) || !C_DECL_INVISIBLE (olddecl))
945 error ("%J'%D' redeclared as different kind of symbol",
947 locate_old_decl (olddecl, error);
949 else if (TREE_PUBLIC (newdecl))
950 warning ("%Jbuilt-in function '%D' declared as non-function",
952 else if (warn_shadow)
953 warning ("%Jshadowing built-in function '%D'",
958 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
960 if (TREE_CODE (olddecl) == FUNCTION_DECL
961 && DECL_BUILT_IN (olddecl) && C_DECL_INVISIBLE (olddecl))
963 /* Accept harmless mismatch in function types.
964 This is for the ffs and fprintf builtins. */
965 tree trytype = match_builtin_function_types (newtype, oldtype);
967 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
968 *oldtypep = oldtype = trytype;
971 /* If types don't match for a built-in, throw away the
972 built-in. No point in calling locate_old_decl here, it
973 won't print anything. */
974 warning ("%Jconflicting types for built-in function '%D'",
979 else if (TREE_CODE (olddecl) == FUNCTION_DECL
980 && DECL_SOURCE_LINE (olddecl) == 0)
982 /* A conflicting function declaration for a predeclared
983 function that isn't actually built in. Objective C uses
984 these. The new declaration silently overrides everything
985 but the volatility (i.e. noreturn) indication. See also
986 below. FIXME: Make Objective C use normal builtins. */
987 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
990 /* Permit void foo (...) to match int foo (...) if the latter is
991 the definition and implicit int was used. See
992 c-torture/compile/920625-2.c. */
993 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
994 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
995 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
996 && C_FUNCTION_IMPLICIT_INT (newdecl))
998 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
999 /* Make sure we keep void as the return type. */
1000 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1001 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1006 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1007 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1008 locate_old_decl (olddecl, error);
1013 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1014 but silently ignore the redeclaration if either is in a system
1015 header. (Conflicting redeclarations were handled above.) */
1016 if (TREE_CODE (newdecl) == TYPE_DECL)
1018 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1019 return true; /* allow OLDDECL to continue in use */
1021 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1022 locate_old_decl (olddecl, error);
1026 /* Function declarations can either be 'static' or 'extern' (no
1027 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1028 can never conflict with each other on account of linkage (6.2.2p4).
1029 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1030 two definitions if one is 'extern inline' and one is not. The non-
1031 extern-inline definition supersedes the extern-inline definition. */
1032 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1034 /* If you declare a built-in function name as static, or
1035 define the built-in with an old-style definition (so we
1036 can't validate the argument list) the built-in definition is
1037 overridden, but optionally warn this was a bad choice of name. */
1038 if (DECL_BUILT_IN (olddecl)
1039 && C_DECL_INVISIBLE (olddecl)
1040 && (!TREE_PUBLIC (newdecl)
1041 || (DECL_INITIAL (newdecl)
1042 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1045 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1046 /* Discard the old built-in function. */
1050 if (DECL_INITIAL (newdecl))
1052 if (DECL_INITIAL (olddecl)
1053 && !(DECL_DECLARED_INLINE_P (olddecl)
1054 && DECL_EXTERNAL (olddecl)
1055 && !(DECL_DECLARED_INLINE_P (newdecl)
1056 && DECL_EXTERNAL (newdecl))))
1058 error ("%Jredefinition of '%D'", newdecl, newdecl);
1059 locate_old_decl (olddecl, error);
1063 /* If we have a prototype after an old-style function definition,
1064 the argument types must be checked specially. */
1065 else if (DECL_INITIAL (olddecl)
1066 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1067 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1068 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1070 locate_old_decl (olddecl, error);
1073 /* Mismatched non-static and static is considered poor style.
1074 We only diagnose static then non-static if -Wtraditional,
1075 because it is the most convenient way to get some effects
1076 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1077 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1078 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1080 /* A static function declaration for a predeclared function
1081 that isn't actually built in, silently overrides the
1082 default. Objective C uses these. See also above.
1083 FIXME: Make Objective C use normal builtins. */
1084 if (TREE_CODE (olddecl) == FUNCTION_DECL
1085 && DECL_SOURCE_LINE (olddecl) == 0)
1089 warning ("%Jstatic declaration of '%D' follows "
1090 "non-static declaration", newdecl, newdecl);
1094 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1095 && warn_traditional)
1097 warning ("%Jnon-static declaration of '%D' follows "
1098 "static declaration", newdecl, newdecl);
1102 else if (TREE_CODE (newdecl) == VAR_DECL)
1104 /* Only variables can be thread-local, and all declarations must
1105 agree on this property. */
1106 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1108 if (DECL_THREAD_LOCAL (newdecl))
1109 error ("%Jthread-local declaration of '%D' follows "
1110 "non-thread-local declaration", newdecl, newdecl);
1112 error ("%Jnon-thread-local declaration of '%D' follows "
1113 "thread-local declaration", newdecl, newdecl);
1115 locate_old_decl (olddecl, error);
1119 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1120 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1122 error ("%Jredefinition of '%D'", newdecl, newdecl);
1123 locate_old_decl (olddecl, error);
1127 /* Objects declared at file scope: if at least one is 'extern',
1128 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1129 if (DECL_FILE_SCOPE_P (newdecl))
1131 if (!DECL_EXTERNAL (newdecl)
1132 && !DECL_EXTERNAL (olddecl)
1133 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1135 if (TREE_PUBLIC (newdecl))
1136 error ("%Jnon-static declaration of '%D' follows "
1137 "static declaration", newdecl, newdecl);
1139 error ("%Jstatic declaration of '%D' follows "
1140 "non-static declaration", newdecl, newdecl);
1142 locate_old_decl (olddecl, error);
1146 /* Two objects with the same name declared at the same block
1147 scope must both be external references (6.7p3). */
1148 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1149 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1151 if (DECL_EXTERNAL (newdecl))
1152 error ("%Jextern declaration of '%D' follows "
1153 "declaration with no linkage", newdecl, newdecl);
1154 else if (DECL_EXTERNAL (olddecl))
1155 error ("%Jdeclaration of '%D' with no linkage follows "
1156 "extern declaration", newdecl, newdecl);
1158 error ("%Jredeclaration of '%D' with no linkage",
1161 locate_old_decl (olddecl, error);
1167 /* All decls must agree on a non-default visibility. */
1168 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1169 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1170 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1172 warning ("%Jredeclaration of '%D' with different visibility "
1173 "(old visibility preserved)", newdecl, newdecl);
1177 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1179 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1180 if (DECL_DECLARED_INLINE_P (newdecl)
1181 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1183 warning ("%Jinline declaration of '%D' follows "
1184 "declaration with attribute noinline", newdecl, newdecl);
1187 else if (DECL_DECLARED_INLINE_P (olddecl)
1188 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1190 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1191 "inline declaration ", newdecl, newdecl);
1195 /* Inline declaration after use or definition.
1196 ??? Should we still warn about this now we have unit-at-a-time
1197 mode and can get it right? */
1198 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1200 if (TREE_USED (olddecl))
1202 warning ("%J'%D' declared inline after being called",
1206 else if (DECL_INITIAL (olddecl))
1208 warning ("%J'%D' declared inline after its definition",
1216 /* These bits are only type qualifiers when applied to objects. */
1217 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1219 if (TREE_THIS_VOLATILE (newdecl))
1220 pedwarn ("%Jvolatile declaration of '%D' follows "
1221 "non-volatile declaration", newdecl, newdecl);
1223 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1224 "volatile declaration", newdecl, newdecl);
1227 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1229 if (TREE_READONLY (newdecl))
1230 pedwarn ("%Jconst declaration of '%D' follows "
1231 "non-const declaration", newdecl, newdecl);
1233 pedwarn ("%Jnon-const declaration of '%D' follows "
1234 "const declaration", newdecl, newdecl);
1239 /* Optional warning for completely redundant decls. */
1240 if (!warned && !pedwarned
1241 && warn_redundant_decls
1242 /* Don't warn about a function declaration followed by a
1244 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1245 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1246 /* Don't warn about an extern followed by a definition. */
1247 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)))
1249 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1253 /* Report location of previous decl/defn in a consistent manner. */
1254 if (warned || pedwarned)
1255 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1260 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1261 consistent with OLDDECL, but carries new information. Merge the
1262 new information into OLDDECL. This function issues no
1266 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1268 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1269 && DECL_INITIAL (newdecl) != 0);
1271 /* For real parm decl following a forward decl, return 1 so old decl
1272 will be reused. Only allow this to happen once. */
1273 if (TREE_CODE (newdecl) == PARM_DECL
1274 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1276 TREE_ASM_WRITTEN (olddecl) = 0;
1280 DECL_ATTRIBUTES (newdecl)
1281 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1283 /* Merge the data types specified in the two decls. */
1285 = TREE_TYPE (olddecl)
1286 = common_type (newtype, oldtype);
1288 /* Lay the type out, unless already done. */
1289 if (oldtype != TREE_TYPE (newdecl))
1291 if (TREE_TYPE (newdecl) != error_mark_node)
1292 layout_type (TREE_TYPE (newdecl));
1293 if (TREE_CODE (newdecl) != FUNCTION_DECL
1294 && TREE_CODE (newdecl) != TYPE_DECL
1295 && TREE_CODE (newdecl) != CONST_DECL)
1296 layout_decl (newdecl, 0);
1300 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1301 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1302 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1303 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1304 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1305 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1307 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1308 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1312 /* Keep the old rtl since we can safely use it. */
1313 COPY_DECL_RTL (olddecl, newdecl);
1315 /* Merge the type qualifiers. */
1316 if (TREE_READONLY (newdecl))
1317 TREE_READONLY (olddecl) = 1;
1319 if (TREE_THIS_VOLATILE (newdecl))
1321 TREE_THIS_VOLATILE (olddecl) = 1;
1322 if (TREE_CODE (newdecl) == VAR_DECL)
1323 make_var_volatile (newdecl);
1326 /* Keep source location of definition rather than declaration. */
1327 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1328 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1330 /* Merge the unused-warning information. */
1331 if (DECL_IN_SYSTEM_HEADER (olddecl))
1332 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1333 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1334 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1336 /* Merge the initialization information. */
1337 if (DECL_INITIAL (newdecl) == 0)
1338 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1340 /* Merge the section attribute.
1341 We want to issue an error if the sections conflict but that must be
1342 done later in decl_attributes since we are called before attributes
1344 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1345 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1347 /* Copy the assembler name.
1348 Currently, it can only be defined in the prototype. */
1349 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1351 /* If either declaration has a nondefault visibility, use it. */
1352 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1353 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1355 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1357 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1358 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1359 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1360 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1361 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1362 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1363 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1364 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1365 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1368 /* Merge the storage class information. */
1369 merge_weak (newdecl, olddecl);
1371 /* For functions, static overrides non-static. */
1372 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1374 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1375 /* This is since we don't automatically
1376 copy the attributes of NEWDECL into OLDDECL. */
1377 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1378 /* If this clears `static', clear it in the identifier too. */
1379 if (! TREE_PUBLIC (olddecl))
1380 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1382 if (DECL_EXTERNAL (newdecl))
1384 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1385 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1387 /* An extern decl does not override previous storage class. */
1388 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1389 if (! DECL_EXTERNAL (newdecl))
1391 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1392 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1397 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1398 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1401 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1403 /* If we're redefining a function previously defined as extern
1404 inline, make sure we emit debug info for the inline before we
1405 throw it away, in case it was inlined into a function that hasn't
1406 been written out yet. */
1407 if (new_is_definition && DECL_INITIAL (olddecl))
1409 if (TREE_USED (olddecl)
1410 /* In unit-at-a-time mode we never inline re-defined extern
1411 inline functions. */
1412 && !flag_unit_at_a_time
1413 && cgraph_function_possibly_inlined_p (olddecl))
1414 (*debug_hooks->outlining_inline_function) (olddecl);
1416 /* The new defn must not be inline. */
1417 DECL_INLINE (newdecl) = 0;
1418 DECL_UNINLINABLE (newdecl) = 1;
1422 /* If either decl says `inline', this fn is inline,
1423 unless its definition was passed already. */
1424 if (DECL_DECLARED_INLINE_P (newdecl)
1425 || DECL_DECLARED_INLINE_P (olddecl))
1426 DECL_DECLARED_INLINE_P (newdecl) = 1;
1428 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1429 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1432 if (DECL_BUILT_IN (olddecl))
1434 /* If redeclaring a builtin function, it stays built in. */
1435 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1436 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1439 /* Also preserve various other info from the definition. */
1440 if (! new_is_definition)
1442 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1443 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1444 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1445 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1446 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1448 /* Set DECL_INLINE on the declaration if we've got a body
1449 from which to instantiate. */
1450 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1452 DECL_INLINE (newdecl) = 1;
1453 DECL_ABSTRACT_ORIGIN (newdecl)
1454 = DECL_ABSTRACT_ORIGIN (olddecl);
1459 /* If a previous declaration said inline, mark the
1460 definition as inlinable. */
1461 if (DECL_DECLARED_INLINE_P (newdecl)
1462 && ! DECL_UNINLINABLE (newdecl))
1463 DECL_INLINE (newdecl) = 1;
1467 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1468 But preserve OLDDECL's DECL_UID. */
1470 unsigned olddecl_uid = DECL_UID (olddecl);
1472 memcpy ((char *) olddecl + sizeof (struct tree_common),
1473 (char *) newdecl + sizeof (struct tree_common),
1474 sizeof (struct tree_decl) - sizeof (struct tree_common));
1475 DECL_UID (olddecl) = olddecl_uid;
1478 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1479 so that encode_section_info has a chance to look at the new decl
1480 flags and attributes. */
1481 if (DECL_RTL_SET_P (olddecl)
1482 && (TREE_CODE (olddecl) == FUNCTION_DECL
1483 || (TREE_CODE (olddecl) == VAR_DECL
1484 && TREE_STATIC (olddecl))))
1485 make_decl_rtl (olddecl, NULL);
1488 /* Handle when a new declaration NEWDECL has the same name as an old
1489 one OLDDECL in the same binding contour. Prints an error message
1492 If safely possible, alter OLDDECL to look like NEWDECL, and return
1493 true. Otherwise, return false. */
1496 duplicate_decls (tree newdecl, tree olddecl)
1498 tree newtype, oldtype;
1500 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1503 merge_decls (newdecl, olddecl, newtype, oldtype);
1508 /* Return any external DECL associated with ID, whether or not it is
1509 currently in scope. */
1512 any_external_decl (tree id)
1514 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1517 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1519 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1522 t = purpose_member (id, truly_local_externals);
1524 return TREE_VALUE (t);
1529 /* Record an external decl DECL. This only does something if a
1530 shadowing decl already exists. */
1532 record_external_decl (tree decl)
1534 tree name = DECL_NAME (decl);
1535 if (!IDENTIFIER_SYMBOL_VALUE (name))
1538 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1541 /* Check whether decl-node X shadows an existing declaration.
1542 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1543 which might be a NULL_TREE. */
1545 warn_if_shadowing (tree x, tree old)
1547 /* Nothing to shadow? */
1549 /* Shadow warnings not wanted? */
1551 /* No shadow warnings for internally generated vars. */
1552 || DECL_SOURCE_LINE (x) == 0
1553 /* No shadow warnings for vars made for inlining. */
1554 || DECL_FROM_INLINE (x)
1555 /* Don't warn about the parm names in function declarator
1556 within a function declarator.
1557 It would be nice to avoid warning in any function
1558 declarator in a declaration, as opposed to a definition,
1559 but there is no way to tell it's not a definition. */
1560 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1563 if (TREE_CODE (old) == PARM_DECL)
1564 warning ("%Jdeclaration of '%D' shadows a parameter", x, x);
1565 else if (DECL_FILE_SCOPE_P (old))
1566 warning ("%Jdeclaration of '%D' shadows a global declaration", x, x);
1568 warning ("%Jdeclaration of '%D' shadows a previous local", x, x);
1570 warning ("%Jshadowed declaration is here", old);
1574 /* Subroutine of pushdecl.
1576 X is a TYPE_DECL for a typedef statement. Create a brand new
1577 ..._TYPE node (which will be just a variant of the existing
1578 ..._TYPE node with identical properties) and then install X
1579 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1581 The whole point here is to end up with a situation where each
1582 and every ..._TYPE node the compiler creates will be uniquely
1583 associated with AT MOST one node representing a typedef name.
1584 This way, even though the compiler substitutes corresponding
1585 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1586 early on, later parts of the compiler can always do the reverse
1587 translation and get back the corresponding typedef name. For
1590 typedef struct S MY_TYPE;
1593 Later parts of the compiler might only know that `object' was of
1594 type `struct S' if it were not for code just below. With this
1595 code however, later parts of the compiler see something like:
1597 struct S' == struct S
1598 typedef struct S' MY_TYPE;
1601 And they can then deduce (from the node for type struct S') that
1602 the original object declaration was:
1606 Being able to do this is important for proper support of protoize,
1607 and also for generating precise symbolic debugging information
1608 which takes full account of the programmer's (typedef) vocabulary.
1610 Obviously, we don't want to generate a duplicate ..._TYPE node if
1611 the TYPE_DECL node that we are now processing really represents a
1612 standard built-in type.
1614 Since all standard types are effectively declared at line zero
1615 in the source file, we can easily check to see if we are working
1616 on a standard type by checking the current value of lineno. */
1619 clone_underlying_type (tree x)
1621 if (DECL_SOURCE_LINE (x) == 0)
1623 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1624 TYPE_NAME (TREE_TYPE (x)) = x;
1626 else if (TREE_TYPE (x) != error_mark_node
1627 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1629 tree tt = TREE_TYPE (x);
1630 DECL_ORIGINAL_TYPE (x) = tt;
1631 tt = build_type_copy (tt);
1633 TREE_USED (tt) = TREE_USED (x);
1638 /* Record a decl-node X as belonging to the current lexical scope.
1639 Check for errors (such as an incompatible declaration for the same
1640 name already seen in the same scope).
1642 Returns either X or an old decl for the same name.
1643 If an old decl is returned, it may have been smashed
1644 to agree with what X says. */
1649 tree name = DECL_NAME (x);
1650 struct c_scope *scope = current_scope;
1652 #ifdef ENABLE_CHECKING
1653 if (error_mark_node == 0)
1654 /* Called too early. */
1658 /* Functions need the lang_decl data. */
1659 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1660 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1662 /* A local extern declaration for a function doesn't constitute nesting.
1663 A local auto declaration does, since it's a forward decl
1664 for a nested function coming later. */
1665 if (current_function_decl == NULL
1666 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1667 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1668 DECL_CONTEXT (x) = current_file_decl;
1670 DECL_CONTEXT (x) = current_function_decl;
1676 if (warn_nested_externs
1677 && scope != global_scope
1678 && DECL_EXTERNAL (x)
1679 && !DECL_IN_SYSTEM_HEADER (x))
1680 warning ("nested extern declaration of `%s'",
1681 IDENTIFIER_POINTER (name));
1683 old = lookup_name_current_level (name);
1684 if (old && duplicate_decls (x, old))
1686 /* For PARM_DECLs, old may be a forward declaration.
1687 If so, we want to remove it from its old location
1688 (in the variables chain) and rechain it in the
1689 location given by the new declaration. */
1690 if (TREE_CODE (x) == PARM_DECL)
1693 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1696 *p = TREE_CHAIN (old);
1697 SCOPE_LIST_APPEND (scope, parms, old);
1703 if (DECL_EXTERNAL (x) || scope == global_scope)
1705 /* Find and check against a previous, not-in-scope, external
1706 decl for this identifier. (C99 6.2.7p2: All declarations
1707 that refer to the same object or function shall have
1708 compatible type; otherwise, the behavior is undefined.) */
1709 tree ext = any_external_decl (name);
1712 if (duplicate_decls (x, ext))
1713 x = copy_node (ext);
1716 record_external_decl (x);
1719 if (TREE_CODE (x) == TYPE_DECL)
1720 clone_underlying_type (x);
1722 /* If storing a local value, there may already be one
1723 (inherited). If so, record it for restoration when this
1724 scope ends. Take care not to do this if we are replacing an
1725 older decl in the same scope (i.e. duplicate_decls returned
1727 if (scope != global_scope
1728 && IDENTIFIER_SYMBOL_VALUE (name)
1729 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1731 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1732 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1736 /* Install the new declaration in the requested scope. */
1737 IDENTIFIER_SYMBOL_VALUE (name) = x;
1738 C_DECL_INVISIBLE (x) = 0;
1740 /* If x's type is incomplete because it's based on a
1741 structure or union which has not yet been fully declared,
1742 attach it to that structure or union type, so we can go
1743 back and complete the variable declaration later, if the
1744 structure or union gets fully declared.
1746 If the input is erroneous, we can have error_mark in the type
1747 slot (e.g. "f(void a, ...)") - that doesn't count as an
1749 if (TREE_TYPE (x) != error_mark_node
1750 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1752 tree element = TREE_TYPE (x);
1754 while (TREE_CODE (element) == ARRAY_TYPE)
1755 element = TREE_TYPE (element);
1756 element = TYPE_MAIN_VARIANT (element);
1758 if ((TREE_CODE (element) == RECORD_TYPE
1759 || TREE_CODE (element) == UNION_TYPE)
1760 && (TREE_CODE (x) != TYPE_DECL
1761 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1762 && !COMPLETE_TYPE_P (element))
1763 C_TYPE_INCOMPLETE_VARS (element)
1764 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1768 if (TREE_CODE (x) == PARM_DECL)
1769 SCOPE_LIST_APPEND (scope, parms, x);
1771 SCOPE_LIST_APPEND (scope, names, x);
1776 /* Record X as belonging to the global scope (C99 "file scope").
1777 This is used only internally by the Objective-C front end,
1778 and is limited to its needs. duplicate_decls is not called;
1779 if there is any preexisting decl for this identifier, it is an ICE. */
1782 pushdecl_top_level (tree x)
1786 if (TREE_CODE (x) != VAR_DECL)
1789 name = DECL_NAME (x);
1791 if (IDENTIFIER_SYMBOL_VALUE (name))
1794 DECL_CONTEXT (x) = current_file_decl;
1795 IDENTIFIER_SYMBOL_VALUE (name) = x;
1797 SCOPE_LIST_APPEND (global_scope, names, x);
1801 /* Generate an implicit declaration for identifier FUNCTIONID as a
1802 function of type int (). */
1805 implicitly_declare (tree functionid)
1807 tree decl = any_external_decl (functionid);
1811 /* Implicit declaration of a function already declared
1812 (somehow) in a different scope, or as a built-in.
1813 If this is the first time this has happened, warn;
1814 then recycle the old declaration. */
1815 if (!C_DECL_IMPLICIT (decl))
1817 implicit_decl_warning (DECL_NAME (decl));
1818 if (! DECL_FILE_SCOPE_P (decl))
1819 warning ("%Jprevious declaration of '%D'", decl, decl);
1820 C_DECL_IMPLICIT (decl) = 1;
1822 /* If this function is global, then it must already be in the
1823 global scope, so there's no need to push it again. */
1824 if (current_scope == global_scope)
1826 /* If this is a local declaration, make a copy; we can't have
1827 the same DECL listed in two different scopes. */
1828 return pushdecl (copy_node (decl));
1831 /* Not seen before. */
1832 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1833 DECL_EXTERNAL (decl) = 1;
1834 TREE_PUBLIC (decl) = 1;
1835 C_DECL_IMPLICIT (decl) = 1;
1836 implicit_decl_warning (functionid);
1838 /* C89 says implicit declarations are in the innermost block.
1839 So we record the decl in the standard fashion. */
1840 decl = pushdecl (decl);
1842 /* No need to call objc_check_decl here - it's a function type. */
1843 rest_of_decl_compilation (decl, NULL, 0, 0);
1845 /* Write a record describing this implicit function declaration
1846 to the prototypes file (if requested). */
1847 gen_aux_info_record (decl, 0, 1, 0);
1849 /* Possibly apply some default attributes to this implicit declaration. */
1850 decl_attributes (&decl, NULL_TREE, 0);
1856 implicit_decl_warning (tree id)
1858 const char *name = IDENTIFIER_POINTER (id);
1859 if (mesg_implicit_function_declaration == 2)
1860 error ("implicit declaration of function `%s'", name);
1861 else if (mesg_implicit_function_declaration == 1)
1862 warning ("implicit declaration of function `%s'", name);
1865 /* Issue an error message for a reference to an undeclared variable
1866 ID, including a reference to a builtin outside of function-call
1867 context. Establish a binding of the identifier to error_mark_node
1868 in an appropriate scope, which will suppress further errors for the
1871 undeclared_variable (tree id)
1873 static bool already = false;
1874 struct c_scope *scope;
1876 if (current_function_decl == 0)
1878 error ("`%s' undeclared here (not in a function)",
1879 IDENTIFIER_POINTER (id));
1880 scope = current_scope;
1884 error ("`%s' undeclared (first use in this function)",
1885 IDENTIFIER_POINTER (id));
1889 error ("(Each undeclared identifier is reported only once");
1890 error ("for each function it appears in.)");
1894 scope = current_function_scope;
1897 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1899 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1902 /* Subroutine of lookup_label, declare_label, define_label: construct a
1903 LABEL_DECL with all the proper frills. */
1906 make_label (tree name, location_t location)
1908 tree label = build_decl (LABEL_DECL, name, void_type_node);
1910 DECL_CONTEXT (label) = current_function_decl;
1911 DECL_MODE (label) = VOIDmode;
1912 DECL_SOURCE_LOCATION (label) = location;
1917 /* Another subroutine of lookup_label, declare_label, define_label:
1918 set up the binding of name to LABEL_DECL in the given SCOPE. */
1921 bind_label (tree name, tree label, struct c_scope *scope)
1923 if (IDENTIFIER_LABEL_VALUE (name))
1924 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1926 IDENTIFIER_LABEL_VALUE (name) = label;
1928 SCOPE_LIST_APPEND (scope, names, label);
1931 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1932 Create one if none exists so far for the current function.
1933 This is called when a label is used in a goto expression or
1934 has its address taken. */
1937 lookup_label (tree name)
1941 if (current_function_decl == 0)
1943 error ("label %s referenced outside of any function",
1944 IDENTIFIER_POINTER (name));
1948 /* Use a label already defined or ref'd with this name, but not if
1949 it is inherited from a containing function and wasn't declared
1951 label = IDENTIFIER_LABEL_VALUE (name);
1952 if (label && (DECL_CONTEXT (label) == current_function_decl
1953 || C_DECLARED_LABEL_FLAG (label)))
1955 /* If the label has only been declared, update its apparent
1956 location to point here, for better diagnostics if it
1957 turns out not to have been defined. */
1958 if (!TREE_USED (label))
1959 DECL_SOURCE_LOCATION (label) = input_location;
1963 /* No label binding for that identifier; make one. */
1964 label = make_label (name, input_location);
1966 /* Ordinary labels go in the current function scope. */
1967 bind_label (name, label, current_function_scope);
1971 /* Make a label named NAME in the current function, shadowing silently
1972 any that may be inherited from containing functions or containing
1973 scopes. This is called for __label__ declarations. */
1975 /* Note that valid use, if the label being shadowed comes from another
1976 scope in the same function, requires calling declare_nonlocal_label
1977 right away. (Is this still true? -zw 2003-07-17) */
1980 declare_label (tree name)
1982 tree label = IDENTIFIER_LABEL_VALUE (name);
1985 /* Check to make sure that the label hasn't already been declared
1987 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
1990 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
1991 error ("%Jthis is a previous declaration", dup);
1993 /* Just use the previous declaration. */
1997 label = make_label (name, input_location);
1998 C_DECLARED_LABEL_FLAG (label) = 1;
2000 /* Declared labels go in the current scope. */
2001 bind_label (name, label, current_scope);
2005 /* Define a label, specifying the location in the source file.
2006 Return the LABEL_DECL node for the label, if the definition is valid.
2007 Otherwise return 0. */
2010 define_label (location_t location, tree name)
2014 /* Find any preexisting label with this name. It is an error
2015 if that label has already been defined in this function, or
2016 if there is a containing function with a declared label with
2018 label = IDENTIFIER_LABEL_VALUE (name);
2021 && ((DECL_CONTEXT (label) == current_function_decl
2022 && DECL_INITIAL (label) != 0)
2023 || (DECL_CONTEXT (label) != current_function_decl
2024 && C_DECLARED_LABEL_FLAG (label))))
2026 error ("%Hduplicate label `%D'", &location, label);
2027 if (DECL_INITIAL (label))
2028 error ("%J`%D' previously defined here", label, label);
2030 error ("%J`%D' previously declared here", label, label);
2033 else if (label && DECL_CONTEXT (label) == current_function_decl)
2035 /* The label has been used or declared already in this function,
2036 but not defined. Update its location to point to this
2038 DECL_SOURCE_LOCATION (label) = location;
2042 /* No label binding for that identifier; make one. */
2043 label = make_label (name, location);
2045 /* Ordinary labels go in the current function scope. */
2046 bind_label (name, label, current_function_scope);
2049 if (warn_traditional && !in_system_header && lookup_name (name))
2050 warning ("%Htraditional C lacks a separate namespace for labels, "
2051 "identifier `%s' conflicts", &location,
2052 IDENTIFIER_POINTER (name));
2054 /* Mark label as having been defined. */
2055 DECL_INITIAL (label) = error_mark_node;
2059 /* Return the list of declarations of the current scope.
2060 This hook is optional and not implemented for C. */
2069 /* Given NAME, an IDENTIFIER_NODE,
2070 return the structure (or union or enum) definition for that name.
2071 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2072 CODE says which kind of type the caller wants;
2073 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2074 If the wrong kind of type is found, an error is reported. */
2077 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2079 tree tag = IDENTIFIER_TAG_VALUE (name);
2085 /* We only care about whether it's in this level if
2086 thislevel_only was set or it might be a type clash. */
2087 if (thislevel_only || TREE_CODE (tag) != code)
2089 if (current_scope == global_scope
2090 || purpose_member (name, current_scope->tags))
2094 if (thislevel_only && !thislevel)
2097 if (TREE_CODE (tag) != code)
2099 /* Definition isn't the kind we were looking for. */
2100 pending_invalid_xref = name;
2101 pending_invalid_xref_location = input_location;
2103 /* If in the same binding level as a declaration as a tag
2104 of a different type, this must not be allowed to
2105 shadow that tag, so give the error immediately.
2106 (For example, "struct foo; union foo;" is invalid.) */
2108 pending_xref_error ();
2113 /* Print an error message now
2114 for a recent invalid struct, union or enum cross reference.
2115 We don't print them immediately because they are not invalid
2116 when used in the `struct foo;' construct for shadowing. */
2119 pending_xref_error (void)
2121 if (pending_invalid_xref != 0)
2122 error ("%H`%s' defined as wrong kind of tag",
2123 &pending_invalid_xref_location,
2124 IDENTIFIER_POINTER (pending_invalid_xref));
2125 pending_invalid_xref = 0;
2129 /* Look up NAME in the current scope and its superiors
2130 in the namespace of variables, functions and typedefs.
2131 Return a ..._DECL node of some kind representing its definition,
2132 or return 0 if it is undefined. */
2135 lookup_name (tree name)
2137 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2138 if (decl == 0 || decl == error_mark_node)
2140 if (C_DECL_INVISIBLE (decl))
2145 /* Similar to `lookup_name' but look only at the current scope. */
2148 lookup_name_current_level (tree name)
2150 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2152 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2155 if (current_scope == global_scope)
2158 /* Scan the current scope for a decl with name NAME.
2159 For PARM_DECLs, we have to look at both ->parms and ->names, since
2160 forward parameter declarations wind up on the ->names list. */
2161 if (TREE_CODE (decl) == PARM_DECL
2162 && chain_member (decl, current_scope->parms))
2164 if (chain_member (decl, current_scope->names))
2170 /* Create the predefined scalar types of C,
2171 and some nodes representing standard constants (0, 1, (void *) 0).
2172 Initialize the global scope.
2173 Make definitions for built-in primitive functions. */
2176 c_init_decl_processing (void)
2179 tree ptr_ftype_void, ptr_ftype_ptr;
2180 location_t save_loc = input_location;
2182 /* Adds some ggc roots, and reserved words for c-parse.in. */
2185 current_function_decl = 0;
2187 /* Make the c_scope structure for global names. */
2189 global_scope = current_scope;
2191 /* Declarations from c_common_nodes_and_builtins must not be associated
2192 with this input file, lest we get differences between using and not
2193 using preprocessed headers. */
2194 input_location.file = "<internal>";
2195 input_location.line = 0;
2197 /* Make the DECL for the toplevel file scope. */
2198 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2200 build_common_tree_nodes (flag_signed_char);
2202 c_common_nodes_and_builtins ();
2204 /* In C, comparisons and TRUTH_* expressions have type int. */
2205 truthvalue_type_node = integer_type_node;
2206 truthvalue_true_node = integer_one_node;
2207 truthvalue_false_node = integer_zero_node;
2209 /* Even in C99, which has a real boolean type. */
2210 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2211 boolean_type_node));
2213 endlink = void_list_node;
2214 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2216 = build_function_type (ptr_type_node,
2217 tree_cons (NULL_TREE, ptr_type_node, endlink));
2219 input_location = save_loc;
2221 pedantic_lvalues = true;
2223 make_fname_decl = c_make_fname_decl;
2224 start_fname_decls ();
2226 first_builtin_decl = global_scope->names;
2227 last_builtin_decl = global_scope->names_last;
2230 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2231 decl, NAME is the initialization string and TYPE_DEP indicates whether
2232 NAME depended on the type of the function. As we don't yet implement
2233 delayed emission of static data, we mark the decl as emitted
2234 so it is not placed in the output. Anything using it must therefore pull
2235 out the STRING_CST initializer directly. FIXME. */
2238 c_make_fname_decl (tree id, int type_dep)
2240 const char *name = fname_as_string (type_dep);
2241 tree decl, type, init;
2242 size_t length = strlen (name);
2244 type = build_array_type
2245 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2246 build_index_type (size_int (length)));
2248 decl = build_decl (VAR_DECL, id, type);
2250 TREE_STATIC (decl) = 1;
2251 TREE_READONLY (decl) = 1;
2252 DECL_ARTIFICIAL (decl) = 1;
2254 init = build_string (length + 1, name);
2255 TREE_TYPE (init) = type;
2256 DECL_INITIAL (decl) = init;
2258 TREE_USED (decl) = 1;
2260 if (current_function_decl)
2262 DECL_CONTEXT (decl) = current_function_decl;
2263 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2264 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2267 finish_decl (decl, init, NULL_TREE);
2272 /* Return a definition for a builtin function named NAME and whose data type
2273 is TYPE. TYPE should be a function type with argument types.
2274 FUNCTION_CODE tells later passes how to compile calls to this function.
2275 See tree.h for its possible values.
2277 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2278 the name to be called if we can't opencode the function. If
2279 ATTRS is nonzero, use that for the function's attribute list. */
2282 builtin_function (const char *name, tree type, int function_code,
2283 enum built_in_class class, const char *library_name,
2286 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2287 DECL_EXTERNAL (decl) = 1;
2288 TREE_PUBLIC (decl) = 1;
2290 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2291 make_decl_rtl (decl, NULL);
2293 DECL_BUILT_IN_CLASS (decl) = class;
2294 DECL_FUNCTION_CODE (decl) = function_code;
2296 /* Warn if a function in the namespace for users
2297 is used without an occasion to consider it declared. */
2298 if (name[0] != '_' || name[1] != '_')
2299 C_DECL_INVISIBLE (decl) = 1;
2301 /* Possibly apply some default attributes to this built-in function. */
2303 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2305 decl_attributes (&decl, NULL_TREE, 0);
2310 /* Called when a declaration is seen that contains no names to declare.
2311 If its type is a reference to a structure, union or enum inherited
2312 from a containing scope, shadow that tag name for the current scope
2313 with a forward reference.
2314 If its type defines a new named structure or union
2315 or defines an enum, it is valid but we need not do anything here.
2316 Otherwise, it is an error. */
2319 shadow_tag (tree declspecs)
2321 shadow_tag_warned (declspecs, 0);
2325 shadow_tag_warned (tree declspecs, int warned)
2328 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2335 pending_invalid_xref = 0;
2337 /* Remove the attributes from declspecs, since they will confuse the
2339 split_specs_attrs (declspecs, &specs, &attrs);
2341 for (link = specs; link; link = TREE_CHAIN (link))
2343 tree value = TREE_VALUE (link);
2344 enum tree_code code = TREE_CODE (value);
2346 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2347 /* Used to test also that TYPE_SIZE (value) != 0.
2348 That caused warning for `struct foo;' at top level in the file. */
2350 tree name = TYPE_NAME (value);
2357 if (warned != 1 && code != ENUMERAL_TYPE)
2358 /* Empty unnamed enum OK */
2360 pedwarn ("unnamed struct/union that defines no instances");
2366 t = lookup_tag (code, name, 1);
2370 t = make_node (code);
2377 if (!warned && ! in_system_header)
2379 warning ("useless keyword or type name in empty declaration");
2386 error ("two types specified in one empty declaration");
2391 pedwarn ("empty declaration");
2395 /* Construct an array declarator. EXPR is the expression inside [], or
2396 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2397 to the pointer to which a parameter array is converted). STATIC_P is
2398 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2399 is nonzero is the array is [*], a VLA of unspecified length which is
2400 nevertheless a complete type (not currently implemented by GCC),
2401 zero otherwise. The declarator is constructed as an ARRAY_REF
2402 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2403 left of the [] (filled by in set_array_declarator_type) and operand 1
2404 is the expression inside; whose TREE_TYPE is the type qualifiers and
2405 which has TREE_STATIC set if "static" is used. */
2408 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2411 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2412 TREE_TYPE (decl) = quals;
2413 TREE_STATIC (decl) = (static_p ? 1 : 0);
2414 if (pedantic && !flag_isoc99)
2416 if (static_p || quals != NULL_TREE)
2417 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2419 pedwarn ("ISO C90 does not support `[*]' array declarators");
2422 warning ("GCC does not yet properly implement `[*]' array declarators");
2426 /* Set the type of an array declarator. DECL is the declarator, as
2427 constructed by build_array_declarator; TYPE is what appears on the left
2428 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2429 abstract declarator, zero otherwise; this is used to reject static and
2430 type qualifiers in abstract declarators, where they are not in the
2434 set_array_declarator_type (tree decl, tree type, int abstract_p)
2436 TREE_OPERAND (decl, 0) = type;
2437 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2438 error ("static or type qualifiers in abstract declarator");
2442 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2445 groktypename (tree typename)
2449 if (TREE_CODE (typename) != TREE_LIST)
2452 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2454 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2457 /* Apply attributes. */
2458 decl_attributes (&typename, attrs, 0);
2463 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2466 groktypename_in_parm_context (tree typename)
2468 if (TREE_CODE (typename) != TREE_LIST)
2470 return grokdeclarator (TREE_VALUE (typename),
2471 TREE_PURPOSE (typename),
2475 /* Decode a declarator in an ordinary declaration or data definition.
2476 This is called as soon as the type information and variable name
2477 have been parsed, before parsing the initializer if any.
2478 Here we create the ..._DECL node, fill in its type,
2479 and put it on the list of decls for the current context.
2480 The ..._DECL node is returned as the value.
2482 Exception: for arrays where the length is not specified,
2483 the type is left null, to be filled in by `finish_decl'.
2485 Function definitions do not come here; they go to start_function
2486 instead. However, external and forward declarations of functions
2487 do go through here. Structure field declarations are done by
2488 grokfield and not through here. */
2491 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2496 /* An object declared as __attribute__((deprecated)) suppresses
2497 warnings of uses of other deprecated items. */
2498 if (lookup_attribute ("deprecated", attributes))
2499 deprecated_state = DEPRECATED_SUPPRESS;
2501 decl = grokdeclarator (declarator, declspecs,
2502 NORMAL, initialized, NULL);
2504 deprecated_state = DEPRECATED_NORMAL;
2506 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2507 && MAIN_NAME_P (DECL_NAME (decl)))
2508 warning ("%J'%D' is usually a function", decl, decl);
2511 /* Is it valid for this decl to have an initializer at all?
2512 If not, set INITIALIZED to zero, which will indirectly
2513 tell `finish_decl' to ignore the initializer once it is parsed. */
2514 switch (TREE_CODE (decl))
2517 error ("typedef `%s' is initialized (use __typeof__ instead)",
2518 IDENTIFIER_POINTER (DECL_NAME (decl)));
2523 error ("function `%s' is initialized like a variable",
2524 IDENTIFIER_POINTER (DECL_NAME (decl)));
2529 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2530 error ("parameter `%s' is initialized",
2531 IDENTIFIER_POINTER (DECL_NAME (decl)));
2536 /* Don't allow initializations for incomplete types
2537 except for arrays which might be completed by the initialization. */
2539 /* This can happen if the array size is an undefined macro. We already
2540 gave a warning, so we don't need another one. */
2541 if (TREE_TYPE (decl) == error_mark_node)
2543 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2545 /* A complete type is ok if size is fixed. */
2547 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2548 || C_DECL_VARIABLE_SIZE (decl))
2550 error ("variable-sized object may not be initialized");
2554 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2556 error ("variable `%s' has initializer but incomplete type",
2557 IDENTIFIER_POINTER (DECL_NAME (decl)));
2560 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2562 error ("elements of array `%s' have incomplete type",
2563 IDENTIFIER_POINTER (DECL_NAME (decl)));
2570 DECL_EXTERNAL (decl) = 0;
2571 if (current_scope == global_scope)
2572 TREE_STATIC (decl) = 1;
2574 /* Tell `pushdecl' this is an initialized decl
2575 even though we don't yet have the initializer expression.
2576 Also tell `finish_decl' it may store the real initializer. */
2577 DECL_INITIAL (decl) = error_mark_node;
2580 /* If this is a function declaration, write a record describing it to the
2581 prototypes file (if requested). */
2583 if (TREE_CODE (decl) == FUNCTION_DECL)
2584 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2586 /* ANSI specifies that a tentative definition which is not merged with
2587 a non-tentative definition behaves exactly like a definition with an
2588 initializer equal to zero. (Section 3.7.2)
2590 -fno-common gives strict ANSI behavior, though this tends to break
2591 a large body of code that grew up without this rule.
2593 Thread-local variables are never common, since there's no entrenched
2594 body of code to break, and it allows more efficient variable references
2595 in the presence of dynamic linking. */
2597 if (TREE_CODE (decl) == VAR_DECL
2599 && TREE_PUBLIC (decl)
2600 && !DECL_THREAD_LOCAL (decl)
2602 DECL_COMMON (decl) = 1;
2604 /* Set attributes here so if duplicate decl, will have proper attributes. */
2605 decl_attributes (&decl, attributes, 0);
2607 if (TREE_CODE (decl) == FUNCTION_DECL
2608 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2610 tree ce = declarator;
2612 if (TREE_CODE (ce) == INDIRECT_REF)
2613 ce = TREE_OPERAND (declarator, 0);
2614 if (TREE_CODE (ce) == CALL_EXPR)
2616 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2617 for (; args; args = TREE_CHAIN (args))
2619 tree type = TREE_TYPE (args);
2620 if (INTEGRAL_TYPE_P (type)
2621 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2622 DECL_ARG_TYPE (args) = integer_type_node;
2627 if (TREE_CODE (decl) == FUNCTION_DECL
2628 && DECL_DECLARED_INLINE_P (decl)
2629 && DECL_UNINLINABLE (decl)
2630 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2631 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2633 /* Add this decl to the current scope.
2634 TEM may equal DECL or it may be a previous decl of the same name. */
2635 tem = pushdecl (decl);
2637 /* For a local variable, define the RTL now. */
2638 if (current_scope != global_scope
2639 /* But not if this is a duplicate decl
2640 and we preserved the rtl from the previous one
2641 (which may or may not happen). */
2642 && !DECL_RTL_SET_P (tem)
2643 && DECL_FILE_SCOPE_P (tem))
2645 if (TREE_TYPE (tem) != error_mark_node
2646 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2647 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2648 && DECL_INITIAL (tem) != 0)))
2655 /* Finish processing of a declaration;
2656 install its initial value.
2657 If the length of an array type is not known before,
2658 it must be determined now, from the initial value, or it is an error. */
2661 finish_decl (tree decl, tree init, tree asmspec_tree)
2663 tree type = TREE_TYPE (decl);
2664 int was_incomplete = (DECL_SIZE (decl) == 0);
2665 const char *asmspec = 0;
2667 /* If a name was specified, get the string. */
2668 if (current_scope == global_scope)
2669 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2671 asmspec = TREE_STRING_POINTER (asmspec_tree);
2673 /* If `start_decl' didn't like having an initialization, ignore it now. */
2674 if (init != 0 && DECL_INITIAL (decl) == 0)
2677 /* Don't crash if parm is initialized. */
2678 if (TREE_CODE (decl) == PARM_DECL)
2682 store_init_value (decl, init);
2684 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2685 || TREE_CODE (decl) == FUNCTION_DECL
2686 || TREE_CODE (decl) == FIELD_DECL))
2687 objc_check_decl (decl);
2689 /* Deduce size of array from initialization, if not already known. */
2690 if (TREE_CODE (type) == ARRAY_TYPE
2691 && TYPE_DOMAIN (type) == 0
2692 && TREE_CODE (decl) != TYPE_DECL)
2695 = (TREE_STATIC (decl)
2696 /* Even if pedantic, an external linkage array
2697 may have incomplete type at first. */
2698 ? pedantic && !TREE_PUBLIC (decl)
2699 : !DECL_EXTERNAL (decl));
2701 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2703 /* Get the completed type made by complete_array_type. */
2704 type = TREE_TYPE (decl);
2707 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2709 else if (failure == 2)
2712 error ("%Jarray size missing in '%D'", decl, decl);
2713 /* If a `static' var's size isn't known,
2714 make it extern as well as static, so it does not get
2716 If it is not `static', then do not mark extern;
2717 finish_incomplete_decl will give it a default size
2718 and it will get allocated. */
2719 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2720 DECL_EXTERNAL (decl) = 1;
2723 /* TYPE_MAX_VALUE is always one less than the number of elements
2724 in the array, because we start counting at zero. Therefore,
2725 warn only if the value is less than zero. */
2726 else if (pedantic && TYPE_DOMAIN (type) != 0
2727 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2728 error ("%Jzero or negative size array '%D'", decl, decl);
2730 layout_decl (decl, 0);
2733 if (TREE_CODE (decl) == VAR_DECL)
2735 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2736 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2737 layout_decl (decl, 0);
2739 if (DECL_SIZE (decl) == 0
2740 /* Don't give an error if we already gave one earlier. */
2741 && TREE_TYPE (decl) != error_mark_node
2742 && (TREE_STATIC (decl)
2744 /* A static variable with an incomplete type
2745 is an error if it is initialized.
2746 Also if it is not file scope.
2747 Otherwise, let it through, but if it is not `extern'
2748 then it may cause an error message later. */
2749 (DECL_INITIAL (decl) != 0
2750 || !DECL_FILE_SCOPE_P (decl))
2752 /* An automatic variable with an incomplete type
2754 !DECL_EXTERNAL (decl)))
2756 error ("%Jstorage size of '%D' isn't known", decl, decl);
2757 TREE_TYPE (decl) = error_mark_node;
2760 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2761 && DECL_SIZE (decl) != 0)
2763 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2764 constant_expression_warning (DECL_SIZE (decl));
2766 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2769 if (TREE_USED (type))
2770 TREE_USED (decl) = 1;
2773 /* If this is a function and an assembler name is specified, reset DECL_RTL
2774 so we can give it its new name. Also, update built_in_decls if it
2775 was a normal built-in. */
2776 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2778 /* ASMSPEC is given, and not the name of a register. Mark the
2779 name with a star so assemble_name won't munge it. */
2780 char *starred = alloca (strlen (asmspec) + 2);
2782 strcpy (starred + 1, asmspec);
2784 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2786 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2787 SET_DECL_RTL (builtin, NULL_RTX);
2788 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2789 #ifdef TARGET_MEM_FUNCTIONS
2790 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2791 init_block_move_fn (starred);
2792 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2793 init_block_clear_fn (starred);
2795 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2796 init_block_move_fn (starred);
2797 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2798 init_block_clear_fn (starred);
2801 SET_DECL_RTL (decl, NULL_RTX);
2802 change_decl_assembler_name (decl, get_identifier (starred));
2805 /* If #pragma weak was used, mark the decl weak now. */
2806 if (current_scope == global_scope)
2807 maybe_apply_pragma_weak (decl);
2809 /* Output the assembler code and/or RTL code for variables and functions,
2810 unless the type is an undefined structure or union.
2811 If not, it will get done when the type is completed. */
2813 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2815 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2816 if (c_dialect_objc ())
2817 objc_check_decl (decl);
2819 if (DECL_FILE_SCOPE_P (decl))
2821 if (DECL_INITIAL (decl) == NULL_TREE
2822 || DECL_INITIAL (decl) == error_mark_node)
2823 /* Don't output anything
2824 when a tentative file-scope definition is seen.
2825 But at end of compilation, do output code for them. */
2826 DECL_DEFER_OUTPUT (decl) = 1;
2827 rest_of_decl_compilation (decl, asmspec, true, 0);
2831 /* This is a local variable. If there is an ASMSPEC, the
2832 user has requested that we handle it specially. */
2835 /* In conjunction with an ASMSPEC, the `register'
2836 keyword indicates that we should place the variable
2837 in a particular register. */
2838 if (DECL_REGISTER (decl))
2839 DECL_C_HARD_REGISTER (decl) = 1;
2841 /* If this is not a static variable, issue a warning.
2842 It doesn't make any sense to give an ASMSPEC for an
2843 ordinary, non-register local variable. Historically,
2844 GCC has accepted -- but ignored -- the ASMSPEC in
2846 if (TREE_CODE (decl) == VAR_DECL
2847 && !DECL_REGISTER (decl)
2848 && !TREE_STATIC (decl))
2849 warning ("%Jignoring asm-specifier for non-static local "
2850 "variable '%D'", decl, decl);
2852 change_decl_assembler_name (decl, get_identifier (asmspec));
2855 if (TREE_CODE (decl) != FUNCTION_DECL)
2856 add_decl_stmt (decl);
2859 if (!DECL_FILE_SCOPE_P (decl))
2861 /* Recompute the RTL of a local array now
2862 if it used to be an incomplete type. */
2864 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2866 /* If we used it already as memory, it must stay in memory. */
2867 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2868 /* If it's still incomplete now, no init will save it. */
2869 if (DECL_SIZE (decl) == 0)
2870 DECL_INITIAL (decl) = 0;
2875 /* If this was marked 'used', be sure it will be output. */
2876 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2877 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2879 if (TREE_CODE (decl) == TYPE_DECL)
2880 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2882 /* At the end of a declaration, throw away any variable type sizes
2883 of types defined inside that declaration. There is no use
2884 computing them in the following function definition. */
2885 if (current_scope == global_scope)
2886 get_pending_sizes ();
2888 /* Install a cleanup (aka destructor) if one was given. */
2889 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2891 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2894 static bool eh_initialized_p;
2896 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2897 tree cleanup_decl = lookup_name (cleanup_id);
2900 /* Build "cleanup(&decl)" for the destructor. */
2901 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2902 cleanup = build_tree_list (NULL_TREE, cleanup);
2903 cleanup = build_function_call (cleanup_decl, cleanup);
2905 /* Don't warn about decl unused; the cleanup uses it. */
2906 TREE_USED (decl) = 1;
2908 /* Initialize EH, if we've been told to do so. */
2909 if (flag_exceptions && !eh_initialized_p)
2911 eh_initialized_p = true;
2912 eh_personality_libfunc
2913 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2914 ? "__gcc_personality_sj0"
2915 : "__gcc_personality_v0");
2916 using_eh_for_cleanups ();
2919 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2924 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2925 and push that on the current scope. */
2928 push_parm_decl (tree parm)
2932 /* Don't attempt to expand sizes while parsing this decl.
2933 (We can get here with i_s_e 1 somehow from Objective-C.) */
2934 int save_immediate_size_expand = immediate_size_expand;
2935 immediate_size_expand = 0;
2937 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2938 TREE_PURPOSE (TREE_PURPOSE (parm)),
2940 decl_attributes (&decl, TREE_VALUE (parm), 0);
2942 decl = pushdecl (decl);
2944 finish_decl (decl, NULL_TREE, NULL_TREE);
2946 immediate_size_expand = save_immediate_size_expand;
2949 /* Mark all the parameter declarations to date as forward decls,
2950 shift them to the variables list, and reset the parameters list.
2951 Also diagnose use of this extension. */
2954 mark_forward_parm_decls (void)
2958 if (pedantic && !current_scope->warned_forward_parm_decls)
2960 pedwarn ("ISO C forbids forward parameter declarations");
2961 current_scope->warned_forward_parm_decls = true;
2964 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2965 TREE_ASM_WRITTEN (parm) = 1;
2967 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
2968 current_scope->parms = 0;
2969 current_scope->parms_last = 0;
2972 static GTY(()) int compound_literal_number;
2974 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2975 literal, which may be an incomplete array type completed by the
2976 initializer; INIT is a CONSTRUCTOR that initializes the compound
2980 build_compound_literal (tree type, tree init)
2982 /* We do not use start_decl here because we have a type, not a declarator;
2983 and do not use finish_decl because the decl should be stored inside
2984 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
2985 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
2988 DECL_EXTERNAL (decl) = 0;
2989 TREE_PUBLIC (decl) = 0;
2990 TREE_STATIC (decl) = (current_scope == global_scope);
2991 DECL_CONTEXT (decl) = current_function_decl;
2992 TREE_USED (decl) = 1;
2993 TREE_TYPE (decl) = type;
2994 TREE_READONLY (decl) = TREE_READONLY (type);
2995 store_init_value (decl, init);
2997 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
2999 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3004 type = TREE_TYPE (decl);
3005 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3006 return error_mark_node;
3008 stmt = build_stmt (DECL_STMT, decl);
3009 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3010 TREE_SIDE_EFFECTS (complit) = 1;
3012 layout_decl (decl, 0);
3014 if (TREE_STATIC (decl))
3016 /* This decl needs a name for the assembler output. We also need
3017 a unique suffix to be added to the name. */
3020 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3021 compound_literal_number);
3022 compound_literal_number++;
3023 DECL_NAME (decl) = get_identifier (name);
3024 DECL_DEFER_OUTPUT (decl) = 1;
3025 DECL_COMDAT (decl) = 1;
3026 DECL_ARTIFICIAL (decl) = 1;
3028 rest_of_decl_compilation (decl, NULL, 1, 0);
3034 /* Make TYPE a complete type based on INITIAL_VALUE.
3035 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3036 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3039 complete_array_type (tree type, tree initial_value, int do_default)
3041 tree maxindex = NULL_TREE;
3046 /* Note MAXINDEX is really the maximum index,
3047 one less than the size. */
3048 if (TREE_CODE (initial_value) == STRING_CST)
3051 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3052 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3055 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3057 tree elts = CONSTRUCTOR_ELTS (initial_value);
3058 maxindex = build_int_2 (-1, -1);
3059 for (; elts; elts = TREE_CHAIN (elts))
3061 if (TREE_PURPOSE (elts))
3062 maxindex = TREE_PURPOSE (elts);
3064 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3065 maxindex, integer_one_node));
3067 maxindex = copy_node (maxindex);
3071 /* Make an error message unless that happened already. */
3072 if (initial_value != error_mark_node)
3075 /* Prevent further error messages. */
3076 maxindex = build_int_2 (0, 0);
3083 maxindex = build_int_2 (0, 0);
3089 TYPE_DOMAIN (type) = build_index_type (maxindex);
3090 if (!TREE_TYPE (maxindex))
3091 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3094 /* Lay out the type now that we can get the real answer. */
3101 /* Determine whether TYPE is a structure with a flexible array member,
3102 or a union containing such a structure (possibly recursively). */
3105 flexible_array_type_p (tree type)
3108 switch (TREE_CODE (type))
3111 x = TYPE_FIELDS (type);
3114 while (TREE_CHAIN (x) != NULL_TREE)
3116 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3117 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3118 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3119 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3123 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3125 if (flexible_array_type_p (TREE_TYPE (x)))
3134 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3135 replacing with appropriate values if they are invalid. */
3137 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3140 unsigned int max_width;
3141 unsigned HOST_WIDE_INT w;
3142 const char *name = orig_name ? orig_name: _("<anonymous>");
3145 STRIP_NOPS (*width);
3147 /* Detect and ignore out of range field width and process valid
3149 if (TREE_CODE (*width) != INTEGER_CST)
3151 error ("bit-field `%s' width not an integer constant", name);
3152 *width = integer_one_node;
3156 constant_expression_warning (*width);
3157 if (tree_int_cst_sgn (*width) < 0)
3159 error ("negative width in bit-field `%s'", name);
3160 *width = integer_one_node;
3162 else if (integer_zerop (*width) && orig_name)
3164 error ("zero width for bit-field `%s'", name);
3165 *width = integer_one_node;
3169 /* Detect invalid bit-field type. */
3170 if (TREE_CODE (*type) != INTEGER_TYPE
3171 && TREE_CODE (*type) != BOOLEAN_TYPE
3172 && TREE_CODE (*type) != ENUMERAL_TYPE)
3174 error ("bit-field `%s' has invalid type", name);
3175 *type = unsigned_type_node;
3178 type_mv = TYPE_MAIN_VARIANT (*type);
3180 && type_mv != integer_type_node
3181 && type_mv != unsigned_type_node
3182 && type_mv != boolean_type_node)
3183 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3185 if (type_mv == boolean_type_node)
3186 max_width = CHAR_TYPE_SIZE;
3188 max_width = TYPE_PRECISION (*type);
3190 if (0 < compare_tree_int (*width, max_width))
3192 error ("width of `%s' exceeds its type", name);
3194 *width = build_int_2 (w, 0);
3197 w = tree_low_cst (*width, 1);
3199 if (TREE_CODE (*type) == ENUMERAL_TYPE
3200 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3201 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3202 warning ("`%s' is narrower than values of its type", name);
3205 /* Given declspecs and a declarator,
3206 determine the name and type of the object declared
3207 and construct a ..._DECL node for it.
3208 (In one case we can return a ..._TYPE node instead.
3209 For invalid input we sometimes return 0.)
3211 DECLSPECS is a chain of tree_list nodes whose value fields
3212 are the storage classes and type specifiers.
3214 DECL_CONTEXT says which syntactic context this declaration is in:
3215 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3216 FUNCDEF for a function definition. Like NORMAL but a few different
3217 error messages in each case. Return value may be zero meaning
3218 this definition is too screwy to try to parse.
3219 PARM for a parameter declaration (either within a function prototype
3220 or before a function body). Make a PARM_DECL, or return void_type_node.
3221 TYPENAME if for a typename (in a cast or sizeof).
3222 Don't make a DECL node; just return the ..._TYPE node.
3223 FIELD for a struct or union field; make a FIELD_DECL.
3224 INITIALIZED is 1 if the decl has an initializer.
3225 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3226 representing the width of the bit-field.
3228 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3229 It may also be so in the PARM case, for a prototype where the
3230 argument type is specified but not the name.
3232 This function is where the complicated C meanings of `static'
3233 and `extern' are interpreted. */
3236 grokdeclarator (tree declarator, tree declspecs,
3237 enum decl_context decl_context, int initialized, tree *width)
3241 tree type = NULL_TREE;
3246 int type_quals = TYPE_UNQUALIFIED;
3248 int explicit_int = 0;
3249 int explicit_char = 0;
3250 int defaulted_int = 0;
3251 tree typedef_decl = 0;
3252 const char *name, *orig_name;
3253 tree typedef_type = 0;
3254 int funcdef_flag = 0;
3255 enum tree_code innermost_code = ERROR_MARK;
3256 int size_varies = 0;
3257 tree decl_attr = NULL_TREE;
3258 tree array_ptr_quals = NULL_TREE;
3259 int array_parm_static = 0;
3260 tree returned_attrs = NULL_TREE;
3261 bool bitfield = width != NULL;
3264 if (decl_context == FUNCDEF)
3265 funcdef_flag = 1, decl_context = NORMAL;
3267 /* Look inside a declarator for the name being declared
3268 and get it as a string, for an error message. */
3270 tree decl = declarator;
3274 switch (TREE_CODE (decl))
3279 innermost_code = TREE_CODE (decl);
3280 decl = TREE_OPERAND (decl, 0);
3284 decl = TREE_VALUE (decl);
3287 case IDENTIFIER_NODE:
3288 name = IDENTIFIER_POINTER (decl);
3300 /* A function definition's declarator must have the form of
3301 a function declarator. */
3303 if (funcdef_flag && innermost_code != CALL_EXPR)
3306 /* If this looks like a function definition, make it one,
3307 even if it occurs where parms are expected.
3308 Then store_parm_decls will reject it and not use it as a parm. */
3309 if (decl_context == NORMAL && !funcdef_flag
3310 && current_scope->parm_flag)
3311 decl_context = PARM;
3313 /* Look through the decl specs and record which ones appear.
3314 Some typespecs are defined as built-in typenames.
3315 Others, the ones that are modifiers of other types,
3316 are represented by bits in SPECBITS: set the bits for
3317 the modifiers that appear. Storage class keywords are also in SPECBITS.
3319 If there is a typedef name or a type, store the type in TYPE.
3320 This includes builtin typedefs such as `int'.
3322 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3323 and did not come from a user typedef.
3325 Set LONGLONG if `long' is mentioned twice. */
3327 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3329 tree id = TREE_VALUE (spec);
3331 /* If the entire declaration is itself tagged as deprecated then
3332 suppress reports of deprecated items. */
3333 if (id && TREE_DEPRECATED (id))
3335 if (deprecated_state != DEPRECATED_SUPPRESS)
3336 warn_deprecated_use (id);
3339 if (id == ridpointers[(int) RID_INT])
3341 if (id == ridpointers[(int) RID_CHAR])
3344 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3346 enum rid i = C_RID_CODE (id);
3347 if ((int) i <= (int) RID_LAST_MODIFIER)
3349 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3352 error ("`long long long' is too long for GCC");
3355 if (pedantic && !flag_isoc99 && ! in_system_header
3357 pedwarn ("ISO C90 does not support `long long'");
3361 else if (specbits & (1 << (int) i))
3363 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3366 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3369 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3372 /* Diagnose "__thread extern". Recall that this list
3373 is in the reverse order seen in the text. */
3375 && (specbits & (1 << (int) RID_EXTERN
3376 | 1 << (int) RID_STATIC)))
3378 if (specbits & 1 << (int) RID_EXTERN)
3379 error ("`__thread' before `extern'");
3381 error ("`__thread' before `static'");
3384 specbits |= 1 << (int) i;
3389 error ("two or more data types in declaration of `%s'", name);
3390 /* Actual typedefs come to us as TYPE_DECL nodes. */
3391 else if (TREE_CODE (id) == TYPE_DECL)
3393 if (TREE_TYPE (id) == error_mark_node)
3394 ; /* Allow the type to default to int to avoid cascading errors. */
3397 type = TREE_TYPE (id);
3398 decl_attr = DECL_ATTRIBUTES (id);
3402 /* Built-in types come as identifiers. */
3403 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3405 tree t = lookup_name (id);
3406 if (TREE_TYPE (t) == error_mark_node)
3408 else if (!t || TREE_CODE (t) != TYPE_DECL)
3409 error ("`%s' fails to be a typedef or built in type",
3410 IDENTIFIER_POINTER (id));
3413 type = TREE_TYPE (t);
3417 else if (TREE_CODE (id) != ERROR_MARK)
3424 typedef_type = type;
3426 size_varies = C_TYPE_VARIABLE_SIZE (type);
3428 /* No type at all: default to `int', and set DEFAULTED_INT
3429 because it was not a user-defined typedef. */
3433 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3434 | (1 << (int) RID_SIGNED)
3435 | (1 << (int) RID_UNSIGNED)
3436 | (1 << (int) RID_COMPLEX))))
3437 /* Don't warn about typedef foo = bar. */
3438 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3439 && ! in_system_header)
3441 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3442 and this is a function, or if -Wimplicit; prefer the former
3443 warning since it is more explicit. */
3444 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3446 warn_about_return_type = 1;
3447 else if (warn_implicit_int || flag_isoc99)
3448 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3453 type = integer_type_node;
3456 /* Now process the modifiers that were specified
3457 and check for invalid combinations. */
3459 /* Long double is a special combination. */
3461 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3462 && TYPE_MAIN_VARIANT (type) == double_type_node)
3464 specbits &= ~(1 << (int) RID_LONG);
3465 type = long_double_type_node;
3468 /* Check all other uses of type modifiers. */
3470 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3471 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3475 if ((specbits & 1 << (int) RID_LONG)
3476 && (specbits & 1 << (int) RID_SHORT))
3477 error ("both long and short specified for `%s'", name);
3478 else if (((specbits & 1 << (int) RID_LONG)
3479 || (specbits & 1 << (int) RID_SHORT))
3481 error ("long or short specified with char for `%s'", name);
3482 else if (((specbits & 1 << (int) RID_LONG)
3483 || (specbits & 1 << (int) RID_SHORT))
3484 && TREE_CODE (type) == REAL_TYPE)
3486 static int already = 0;
3488 error ("long or short specified with floating type for `%s'", name);
3489 if (! already && ! pedantic)
3491 error ("the only valid combination is `long double'");
3495 else if ((specbits & 1 << (int) RID_SIGNED)
3496 && (specbits & 1 << (int) RID_UNSIGNED))
3497 error ("both signed and unsigned specified for `%s'", name);
3498 else if (TREE_CODE (type) != INTEGER_TYPE)
3499 error ("long, short, signed or unsigned invalid for `%s'", name);
3503 if (!explicit_int && !defaulted_int && !explicit_char)
3505 error ("long, short, signed or unsigned used invalidly for `%s'",
3511 /* Discard the type modifiers if they are invalid. */
3514 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3515 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3520 if ((specbits & (1 << (int) RID_COMPLEX))
3521 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3523 error ("complex invalid for `%s'", name);
3524 specbits &= ~(1 << (int) RID_COMPLEX);
3527 /* Decide whether an integer type is signed or not.
3528 Optionally treat bit-fields as signed by default. */
3529 if (specbits & 1 << (int) RID_UNSIGNED
3530 || (bitfield && ! flag_signed_bitfields
3531 && (explicit_int || defaulted_int || explicit_char
3532 /* A typedef for plain `int' without `signed'
3533 can be controlled just like plain `int'. */
3534 || ! (typedef_decl != 0
3535 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3536 && TREE_CODE (type) != ENUMERAL_TYPE
3537 && !(specbits & 1 << (int) RID_SIGNED)))
3540 type = long_long_unsigned_type_node;
3541 else if (specbits & 1 << (int) RID_LONG)
3542 type = long_unsigned_type_node;
3543 else if (specbits & 1 << (int) RID_SHORT)
3544 type = short_unsigned_type_node;
3545 else if (type == char_type_node)
3546 type = unsigned_char_type_node;
3547 else if (typedef_decl)
3548 type = c_common_unsigned_type (type);
3550 type = unsigned_type_node;
3552 else if ((specbits & 1 << (int) RID_SIGNED)
3553 && type == char_type_node)
3554 type = signed_char_type_node;
3556 type = long_long_integer_type_node;
3557 else if (specbits & 1 << (int) RID_LONG)
3558 type = long_integer_type_node;
3559 else if (specbits & 1 << (int) RID_SHORT)
3560 type = short_integer_type_node;
3562 if (specbits & 1 << (int) RID_COMPLEX)
3564 if (pedantic && !flag_isoc99)
3565 pedwarn ("ISO C90 does not support complex types");
3566 /* If we just have "complex", it is equivalent to
3567 "complex double", but if any modifiers at all are specified it is
3568 the complex form of TYPE. E.g, "complex short" is
3569 "complex short int". */
3571 if (defaulted_int && ! longlong
3572 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3573 | (1 << (int) RID_SIGNED)
3574 | (1 << (int) RID_UNSIGNED))))
3577 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3578 type = complex_double_type_node;
3580 else if (type == integer_type_node)
3583 pedwarn ("ISO C does not support complex integer types");
3584 type = complex_integer_type_node;
3586 else if (type == float_type_node)
3587 type = complex_float_type_node;
3588 else if (type == double_type_node)
3589 type = complex_double_type_node;
3590 else if (type == long_double_type_node)
3591 type = complex_long_double_type_node;
3595 pedwarn ("ISO C does not support complex integer types");
3596 type = build_complex_type (type);
3600 /* Check the type and width of a bit-field. */
3602 check_bitfield_type_and_width (&type, width, orig_name);
3604 /* Figure out the type qualifiers for the declaration. There are
3605 two ways a declaration can become qualified. One is something
3606 like `const int i' where the `const' is explicit. Another is
3607 something like `typedef const int CI; CI i' where the type of the
3608 declaration contains the `const'. A third possibility is that
3609 there is a type qualifier on the element type of a typedefed
3610 array type, in which case we should extract that qualifier so
3611 that c_apply_type_quals_to_decls receives the full list of
3612 qualifiers to work with (C90 is not entirely clear about whether
3613 duplicate qualifiers should be diagnosed in this case, but it
3614 seems most appropriate to do so). */
3615 element_type = strip_array_types (type);
3616 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3618 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3620 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3621 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3622 if (constp > 1 && ! flag_isoc99)
3623 pedwarn ("duplicate `const'");
3624 if (restrictp > 1 && ! flag_isoc99)
3625 pedwarn ("duplicate `restrict'");
3626 if (volatilep > 1 && ! flag_isoc99)
3627 pedwarn ("duplicate `volatile'");
3628 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3629 type = TYPE_MAIN_VARIANT (type);
3630 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3631 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3632 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3634 /* Warn if two storage classes are given. Default to `auto'. */
3639 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3640 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3641 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3642 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3643 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3645 /* "static __thread" and "extern __thread" are allowed. */
3646 if ((specbits & (1 << (int) RID_THREAD
3647 | 1 << (int) RID_STATIC
3648 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3651 /* Warn about storage classes that are invalid for certain
3652 kinds of declarations (parameters, typenames, etc.). */
3655 error ("multiple storage classes in declaration of `%s'", name);
3656 else if (funcdef_flag
3658 & ((1 << (int) RID_REGISTER)
3659 | (1 << (int) RID_AUTO)
3660 | (1 << (int) RID_TYPEDEF)
3661 | (1 << (int) RID_THREAD))))
3663 if (specbits & 1 << (int) RID_AUTO
3664 && (pedantic || current_scope == global_scope))
3665 pedwarn ("function definition declared `auto'");
3666 if (specbits & 1 << (int) RID_REGISTER)
3667 error ("function definition declared `register'");
3668 if (specbits & 1 << (int) RID_TYPEDEF)
3669 error ("function definition declared `typedef'");
3670 if (specbits & 1 << (int) RID_THREAD)
3671 error ("function definition declared `__thread'");
3672 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3673 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3675 else if (decl_context != NORMAL && nclasses > 0)
3677 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3681 switch (decl_context)
3684 error ("storage class specified for structure field `%s'",
3688 error ("storage class specified for parameter `%s'", name);
3691 error ("storage class specified for typename");
3694 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3695 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3696 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3699 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3701 /* `extern' with initialization is invalid if not at file scope. */
3702 if (current_scope == global_scope)
3703 warning ("`%s' initialized and declared `extern'", name);
3705 error ("`%s' has both `extern' and initializer", name);
3707 else if (current_scope == global_scope)
3709 if (specbits & 1 << (int) RID_AUTO)
3710 error ("file-scope declaration of `%s' specifies `auto'", name);
3714 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3715 error ("nested function `%s' declared `extern'", name);
3716 else if ((specbits & (1 << (int) RID_THREAD
3717 | 1 << (int) RID_EXTERN
3718 | 1 << (int) RID_STATIC))
3719 == (1 << (int) RID_THREAD))
3721 error ("function-scope `%s' implicitly auto and declared `__thread'",
3723 specbits &= ~(1 << (int) RID_THREAD);
3728 /* Now figure out the structure of the declarator proper.
3729 Descend through it, creating more complex types, until we reach
3730 the declared identifier (or NULL_TREE, in an absolute declarator). */
3732 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3734 if (type == error_mark_node)
3736 declarator = TREE_OPERAND (declarator, 0);
3740 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3741 an INDIRECT_REF (for *...),
3742 a CALL_EXPR (for ...(...)),
3743 a TREE_LIST (for nested attributes),
3744 an identifier (for the name being declared)
3745 or a null pointer (for the place in an absolute declarator
3746 where the name was omitted).
3747 For the last two cases, we have just exited the loop.
3749 At this point, TYPE is the type of elements of an array,
3750 or for a function to return, or for a pointer to point to.
3751 After this sequence of ifs, TYPE is the type of the
3752 array or function or pointer, and DECLARATOR has had its
3753 outermost layer removed. */
3755 if (array_ptr_quals != NULL_TREE || array_parm_static)
3757 /* Only the innermost declarator (making a parameter be of
3758 array type which is converted to pointer type)
3759 may have static or type qualifiers. */
3760 error ("static or type qualifiers in non-parameter array declarator");
3761 array_ptr_quals = NULL_TREE;
3762 array_parm_static = 0;
3765 if (TREE_CODE (declarator) == TREE_LIST)
3767 /* We encode a declarator with embedded attributes using
3769 tree attrs = TREE_PURPOSE (declarator);
3772 declarator = TREE_VALUE (declarator);
3773 inner_decl = declarator;
3774 while (inner_decl != NULL_TREE
3775 && TREE_CODE (inner_decl) == TREE_LIST)
3776 inner_decl = TREE_VALUE (inner_decl);
3777 if (inner_decl == NULL_TREE
3778 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3779 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3780 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3781 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3782 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3783 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3784 returned_attrs = decl_attributes (&type,
3785 chainon (returned_attrs, attrs),
3788 else if (TREE_CODE (declarator) == ARRAY_REF)
3790 tree itype = NULL_TREE;
3791 tree size = TREE_OPERAND (declarator, 1);
3792 /* The index is a signed object `sizetype' bits wide. */
3793 tree index_type = c_common_signed_type (sizetype);
3795 array_ptr_quals = TREE_TYPE (declarator);
3796 array_parm_static = TREE_STATIC (declarator);
3798 declarator = TREE_OPERAND (declarator, 0);
3800 /* Check for some types that there cannot be arrays of. */
3802 if (VOID_TYPE_P (type))
3804 error ("declaration of `%s' as array of voids", name);
3805 type = error_mark_node;
3808 if (TREE_CODE (type) == FUNCTION_TYPE)
3810 error ("declaration of `%s' as array of functions", name);
3811 type = error_mark_node;
3814 if (pedantic && flexible_array_type_p (type))
3815 pedwarn ("invalid use of structure with flexible array member");
3817 if (size == error_mark_node)
3818 type = error_mark_node;
3820 if (type == error_mark_node)
3823 /* If size was specified, set ITYPE to a range-type for that size.
3824 Otherwise, ITYPE remains null. finish_decl may figure it out
3825 from an initial value. */
3829 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3830 STRIP_TYPE_NOPS (size);
3832 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3834 error ("size of array `%s' has non-integer type", name);
3835 size = integer_one_node;
3838 if (pedantic && integer_zerop (size))
3839 pedwarn ("ISO C forbids zero-size array `%s'", name);
3841 if (TREE_CODE (size) == INTEGER_CST)
3843 constant_expression_warning (size);
3844 if (tree_int_cst_sgn (size) < 0)
3846 error ("size of array `%s' is negative", name);
3847 size = integer_one_node;
3852 /* Make sure the array size remains visibly nonconstant
3853 even if it is (eg) a const variable with known value. */
3856 if (!flag_isoc99 && pedantic)
3858 if (TREE_CONSTANT (size))
3859 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3862 pedwarn ("ISO C90 forbids variable-size array `%s'",
3867 if (integer_zerop (size))
3869 /* A zero-length array cannot be represented with an
3870 unsigned index type, which is what we'll get with
3871 build_index_type. Create an open-ended range instead. */
3872 itype = build_range_type (sizetype, size, NULL_TREE);
3876 /* Compute the maximum valid index, that is, size - 1.
3877 Do the calculation in index_type, so that if it is
3878 a variable the computations will be done in the
3880 itype = fold (build (MINUS_EXPR, index_type,
3881 convert (index_type, size),
3882 convert (index_type, size_one_node)));
3884 /* If that overflowed, the array is too big.
3885 ??? While a size of INT_MAX+1 technically shouldn't
3886 cause an overflow (because we subtract 1), the overflow
3887 is recorded during the conversion to index_type, before
3888 the subtraction. Handling this case seems like an
3889 unnecessary complication. */
3890 if (TREE_OVERFLOW (itype))
3892 error ("size of array `%s' is too large", name);
3893 type = error_mark_node;
3899 /* We must be able to distinguish the
3900 SAVE_EXPR_CONTEXT for the variably-sized type
3901 so that we can set it correctly in
3902 set_save_expr_context. The convention is
3903 that all SAVE_EXPRs that need to be reset
3904 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3905 tree cfd = current_function_decl;
3906 if (decl_context == PARM)
3907 current_function_decl = NULL_TREE;
3908 itype = variable_size (itype);
3909 if (decl_context == PARM)
3910 current_function_decl = cfd;
3912 itype = build_index_type (itype);
3915 else if (decl_context == FIELD)
3917 if (pedantic && !flag_isoc99 && !in_system_header)
3918 pedwarn ("ISO C90 does not support flexible array members");
3920 /* ISO C99 Flexible array members are effectively identical
3921 to GCC's zero-length array extension. */
3922 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3925 /* If pedantic, complain about arrays of incomplete types. */
3927 if (pedantic && !COMPLETE_TYPE_P (type))
3928 pedwarn ("array type has incomplete element type");
3930 /* Build the array type itself, then merge any constancy or
3931 volatility into the target type. We must do it in this order
3932 to ensure that the TYPE_MAIN_VARIANT field of the array type
3933 is set correctly. */
3935 type = build_array_type (type, itype);
3937 type = c_build_qualified_type (type, type_quals);
3940 C_TYPE_VARIABLE_SIZE (type) = 1;
3942 /* The GCC extension for zero-length arrays differs from
3943 ISO flexible array members in that sizeof yields zero. */
3944 if (size && integer_zerop (size))
3947 TYPE_SIZE (type) = bitsize_zero_node;
3948 TYPE_SIZE_UNIT (type) = size_zero_node;
3950 if (decl_context != PARM
3951 && (array_ptr_quals != NULL_TREE || array_parm_static))
3953 error ("static or type qualifiers in non-parameter array declarator");
3954 array_ptr_quals = NULL_TREE;
3955 array_parm_static = 0;
3958 else if (TREE_CODE (declarator) == CALL_EXPR)
3962 /* Declaring a function type.
3963 Make sure we have a valid type for the function to return. */
3964 if (type == error_mark_node)
3969 /* Warn about some types functions can't return. */
3971 if (TREE_CODE (type) == FUNCTION_TYPE)
3973 error ("`%s' declared as function returning a function", name);
3974 type = integer_type_node;
3976 if (TREE_CODE (type) == ARRAY_TYPE)
3978 error ("`%s' declared as function returning an array", name);
3979 type = integer_type_node;
3982 /* Construct the function type and go to the next
3983 inner layer of declarator. */
3985 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3987 /* Say it's a definition
3988 only for the CALL_EXPR
3989 closest to the identifier. */
3990 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3991 /* Type qualifiers before the return type of the function
3992 qualify the return type, not the function type. */
3995 /* Type qualifiers on a function return type are normally
3996 permitted by the standard but have no effect, so give a
3997 warning at -Wextra. Qualifiers on a void return type have
3998 meaning as a GNU extension, and are banned on function
3999 definitions in ISO C. FIXME: strictly we shouldn't
4000 pedwarn for qualified void return types except on function
4001 definitions, but not doing so could lead to the undesirable
4002 state of a "volatile void" function return type not being
4003 warned about, and a use of the function being compiled
4004 with GNU semantics, with no diagnostics under -pedantic. */
4005 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4006 pedwarn ("ISO C forbids qualified void function return type");
4007 else if (extra_warnings
4008 && !(VOID_TYPE_P (type)
4009 && type_quals == TYPE_QUAL_VOLATILE))
4010 warning ("type qualifiers ignored on function return type");
4012 type = c_build_qualified_type (type, type_quals);
4014 type_quals = TYPE_UNQUALIFIED;
4016 type = build_function_type (type, arg_types);
4017 declarator = TREE_OPERAND (declarator, 0);
4019 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4020 the formal parameter list of this FUNCTION_TYPE to point to
4021 the FUNCTION_TYPE node itself. */
4026 for (link = last_function_parm_tags;
4028 link = TREE_CHAIN (link))
4029 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4032 else if (TREE_CODE (declarator) == INDIRECT_REF)
4034 /* Merge any constancy or volatility into the target type
4037 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4039 pedwarn ("ISO C forbids qualified function types");
4041 type = c_build_qualified_type (type, type_quals);
4042 type_quals = TYPE_UNQUALIFIED;
4045 type = build_pointer_type (type);
4047 /* Process a list of type modifier keywords
4048 (such as const or volatile) that were given inside the `*'. */
4050 if (TREE_TYPE (declarator))
4058 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4059 typemodlist = TREE_CHAIN (typemodlist))
4061 tree qualifier = TREE_VALUE (typemodlist);
4063 if (C_IS_RESERVED_WORD (qualifier))
4065 if (C_RID_CODE (qualifier) == RID_CONST)
4067 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4069 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4079 error ("invalid type modifier within pointer declarator");
4080 if (constp > 1 && ! flag_isoc99)
4081 pedwarn ("duplicate `const'");
4082 if (volatilep > 1 && ! flag_isoc99)
4083 pedwarn ("duplicate `volatile'");
4084 if (restrictp > 1 && ! flag_isoc99)
4085 pedwarn ("duplicate `restrict'");
4087 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4088 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4089 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4092 declarator = TREE_OPERAND (declarator, 0);
4099 /* Now TYPE has the actual type. */
4101 /* Did array size calculations overflow? */
4103 if (TREE_CODE (type) == ARRAY_TYPE
4104 && COMPLETE_TYPE_P (type)
4105 && TREE_OVERFLOW (TYPE_SIZE (type)))
4107 error ("size of array `%s' is too large", name);
4108 /* If we proceed with the array type as it is, we'll eventually
4109 crash in tree_low_cst(). */
4110 type = error_mark_node;
4113 /* If this is declaring a typedef name, return a TYPE_DECL. */
4115 if (specbits & (1 << (int) RID_TYPEDEF))
4118 /* Note that the grammar rejects storage classes
4119 in typenames, fields or parameters */
4120 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4122 pedwarn ("ISO C forbids qualified function types");
4124 type = c_build_qualified_type (type, type_quals);
4125 decl = build_decl (TYPE_DECL, declarator, type);
4126 if ((specbits & (1 << (int) RID_SIGNED))
4127 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4128 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4129 decl_attributes (&decl, returned_attrs, 0);
4133 /* Detect the case of an array type of unspecified size
4134 which came, as such, direct from a typedef name.
4135 We must copy the type, so that each identifier gets
4136 a distinct type, so that each identifier's size can be
4137 controlled separately by its own initializer. */
4139 if (type != 0 && typedef_type != 0
4140 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4141 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4143 type = build_array_type (TREE_TYPE (type), 0);
4145 C_TYPE_VARIABLE_SIZE (type) = 1;
4148 /* If this is a type name (such as, in a cast or sizeof),
4149 compute the type and return it now. */
4151 if (decl_context == TYPENAME)
4153 /* Note that the grammar rejects storage classes
4154 in typenames, fields or parameters */
4155 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4157 pedwarn ("ISO C forbids const or volatile function types");
4159 type = c_build_qualified_type (type, type_quals);
4160 decl_attributes (&type, returned_attrs, 0);
4164 /* Aside from typedefs and type names (handle above),
4165 `void' at top level (not within pointer)
4166 is allowed only in public variables.
4167 We don't complain about parms either, but that is because
4168 a better error message can be made later. */
4170 if (VOID_TYPE_P (type) && decl_context != PARM
4171 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4172 && ((specbits & (1 << (int) RID_EXTERN))
4173 || (current_scope == global_scope
4175 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4177 error ("variable or field `%s' declared void", name);
4178 type = integer_type_node;
4181 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4182 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4187 if (decl_context == PARM)
4189 tree type_as_written;
4192 /* A parameter declared as an array of T is really a pointer to T.
4193 One declared as a function is really a pointer to a function. */
4195 if (TREE_CODE (type) == ARRAY_TYPE)
4197 /* Transfer const-ness of array into that of type pointed to. */
4198 type = TREE_TYPE (type);
4200 type = c_build_qualified_type (type, type_quals);
4201 type = build_pointer_type (type);
4202 type_quals = TYPE_UNQUALIFIED;
4203 if (array_ptr_quals)
4205 tree new_ptr_quals, new_ptr_attrs;
4207 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4208 /* We don't yet implement attributes in this context. */
4209 if (new_ptr_attrs != NULL_TREE)
4210 warning ("attributes in parameter array declarator ignored");
4215 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4217 tree qualifier = TREE_VALUE (new_ptr_quals);
4219 if (C_IS_RESERVED_WORD (qualifier))
4221 if (C_RID_CODE (qualifier) == RID_CONST)
4223 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4225 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4235 error ("invalid type modifier within array declarator");
4237 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4238 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4239 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4243 else if (TREE_CODE (type) == FUNCTION_TYPE)
4245 if (pedantic && type_quals)
4246 pedwarn ("ISO C forbids qualified function types");
4248 type = c_build_qualified_type (type, type_quals);
4249 type = build_pointer_type (type);
4250 type_quals = TYPE_UNQUALIFIED;
4252 else if (type_quals)
4253 type = c_build_qualified_type (type, type_quals);
4255 type_as_written = type;
4257 decl = build_decl (PARM_DECL, declarator, type);
4259 C_DECL_VARIABLE_SIZE (decl) = 1;
4261 /* Compute the type actually passed in the parmlist,
4262 for the case where there is no prototype.
4263 (For example, shorts and chars are passed as ints.)
4264 When there is a prototype, this is overridden later. */
4266 if (type == error_mark_node)
4267 promoted_type = type;
4269 promoted_type = c_type_promotes_to (type);
4271 DECL_ARG_TYPE (decl) = promoted_type;
4272 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4274 else if (decl_context == FIELD)
4276 /* Structure field. It may not be a function. */
4278 if (TREE_CODE (type) == FUNCTION_TYPE)
4280 error ("field `%s' declared as a function", name);
4281 type = build_pointer_type (type);
4283 else if (TREE_CODE (type) != ERROR_MARK
4284 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4286 error ("field `%s' has incomplete type", name);
4287 type = error_mark_node;
4289 /* Move type qualifiers down to element of an array. */
4290 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4291 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4293 TYPE_DOMAIN (type));
4294 decl = build_decl (FIELD_DECL, declarator, type);
4295 DECL_NONADDRESSABLE_P (decl) = bitfield;
4298 C_DECL_VARIABLE_SIZE (decl) = 1;
4300 else if (TREE_CODE (type) == FUNCTION_TYPE)
4302 /* Every function declaration is "external"
4303 except for those which are inside a function body
4304 in which `auto' is used.
4305 That is a case not specified by ANSI C,
4306 and we use it for forward declarations for nested functions. */
4307 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4308 || current_scope == global_scope);
4310 if (specbits & (1 << (int) RID_AUTO)
4311 && (pedantic || current_scope == global_scope))
4312 pedwarn ("invalid storage class for function `%s'", name);
4313 if (specbits & (1 << (int) RID_REGISTER))
4314 error ("invalid storage class for function `%s'", name);
4315 if (specbits & (1 << (int) RID_THREAD))
4316 error ("invalid storage class for function `%s'", name);
4317 /* Function declaration not at file scope.
4318 Storage classes other than `extern' are not allowed
4319 and `extern' makes no difference. */
4320 if (current_scope != global_scope
4321 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4323 pedwarn ("invalid storage class for function `%s'", name);
4325 decl = build_decl (FUNCTION_DECL, declarator, type);
4326 decl = build_decl_attribute_variant (decl, decl_attr);
4328 DECL_LANG_SPECIFIC (decl)
4329 = ggc_alloc_cleared (sizeof (struct lang_decl));
4331 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4332 pedwarn ("ISO C forbids qualified function types");
4334 /* GNU C interprets a `volatile void' return type to indicate
4335 that the function does not return. */
4336 if ((type_quals & TYPE_QUAL_VOLATILE)
4337 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4338 warning ("`noreturn' function returns non-void value");
4341 DECL_EXTERNAL (decl) = 1;
4342 /* Record absence of global scope for `static' or `auto'. */
4344 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4347 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4349 /* Record presence of `inline', if it is reasonable. */
4350 if (MAIN_NAME_P (declarator))
4353 warning ("cannot inline function `main'");
4357 /* Record that the function is declared `inline'. */
4358 DECL_DECLARED_INLINE_P (decl) = 1;
4360 /* Do not mark bare declarations as DECL_INLINE. Doing so
4361 in the presence of multiple declarations can result in
4362 the abstract origin pointing between the declarations,
4363 which will confuse dwarf2out. */
4366 DECL_INLINE (decl) = 1;
4367 if (specbits & (1 << (int) RID_EXTERN))
4368 current_extern_inline = 1;
4371 /* If -finline-functions, assume it can be inlined. This does
4372 two things: let the function be deferred until it is actually
4373 needed, and let dwarf2 know that the function is inlinable. */
4374 else if (flag_inline_trees == 2 && initialized)
4375 DECL_INLINE (decl) = 1;
4379 /* It's a variable. */
4380 /* An uninitialized decl with `extern' is a reference. */
4381 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4383 /* Move type qualifiers down to element of an array. */
4384 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4386 int saved_align = TYPE_ALIGN(type);
4387 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4389 TYPE_DOMAIN (type));
4390 TYPE_ALIGN (type) = saved_align;
4392 else if (type_quals)
4393 type = c_build_qualified_type (type, type_quals);
4395 /* It is invalid to create an `extern' declaration for a
4396 variable if there is a global declaration that is
4398 if (extern_ref && current_scope != global_scope)
4402 global_decl = identifier_global_value (declarator);
4404 && TREE_CODE (global_decl) == VAR_DECL
4405 && !TREE_PUBLIC (global_decl))
4406 error ("variable previously declared `static' redeclared "
4410 decl = build_decl (VAR_DECL, declarator, type);
4412 C_DECL_VARIABLE_SIZE (decl) = 1;
4415 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4417 DECL_EXTERNAL (decl) = extern_ref;
4419 /* At file scope, the presence of a `static' or `register' storage
4420 class specifier, or the absence of all storage class specifiers
4421 makes this declaration a definition (perhaps tentative). Also,
4422 the absence of both `static' and `register' makes it public. */
4423 if (current_scope == global_scope)
4425 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4426 | (1 << (int) RID_REGISTER)));
4427 TREE_STATIC (decl) = !extern_ref;
4429 /* Not at file scope, only `static' makes a static definition. */
4432 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4433 TREE_PUBLIC (decl) = extern_ref;
4436 if (specbits & 1 << (int) RID_THREAD)
4438 if (targetm.have_tls)
4439 DECL_THREAD_LOCAL (decl) = 1;
4441 /* A mere warning is sure to result in improper semantics
4442 at runtime. Don't bother to allow this to compile. */
4443 error ("thread-local storage not supported for this target");
4447 /* Record `register' declaration for warnings on &
4448 and in case doing stupid register allocation. */
4450 if (specbits & (1 << (int) RID_REGISTER))
4451 DECL_REGISTER (decl) = 1;
4453 /* Record constancy and volatility. */
4454 c_apply_type_quals_to_decl (type_quals, decl);
4456 /* If a type has volatile components, it should be stored in memory.
4457 Otherwise, the fact that those components are volatile
4458 will be ignored, and would even crash the compiler. */
4459 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4460 c_mark_addressable (decl);
4462 #ifdef ENABLE_CHECKING
4463 /* This is the earliest point at which we might know the assembler
4464 name of a variable. Thus, if it's known before this, die horribly. */
4465 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4469 decl_attributes (&decl, returned_attrs, 0);
4475 /* Decode the parameter-list info for a function type or function definition.
4476 The argument is the value returned by `get_parm_info' (or made in parse.y
4477 if there is an identifier list instead of a parameter decl list).
4478 These two functions are separate because when a function returns
4479 or receives functions then each is called multiple times but the order
4480 of calls is different. The last call to `grokparms' is always the one
4481 that contains the formal parameter names of a function definition.
4483 Store in `last_function_parms' a chain of the decls of parms.
4484 Also store in `last_function_parm_tags' a chain of the struct, union,
4485 and enum tags declared among the parms.
4487 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4489 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4490 a mere declaration. A nonempty identifier-list gets an error message
4491 when FUNCDEF_FLAG is zero. */
4494 grokparms (tree parms_info, int funcdef_flag)
4496 tree first_parm = TREE_CHAIN (parms_info);
4498 last_function_parms = TREE_PURPOSE (parms_info);
4499 last_function_parm_tags = TREE_VALUE (parms_info);
4500 last_function_parm_others = TREE_TYPE (parms_info);
4502 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4503 && !in_system_header)
4504 warning ("function declaration isn't a prototype");
4507 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4510 pedwarn ("parameter names (without types) in function declaration");
4512 last_function_parms = first_parm;
4519 /* If the arg types are incomplete in a declaration,
4520 they must include undefined tags.
4521 These tags can never be defined in the scope of the declaration,
4522 so the types can never be completed,
4523 and no call can be compiled successfully. */
4525 for (parm = last_function_parms, typelt = first_parm;
4527 parm = TREE_CHAIN (parm))
4528 /* Skip over any enumeration constants declared here. */
4529 if (TREE_CODE (parm) == PARM_DECL)
4531 /* Barf if the parameter itself has an incomplete type. */
4532 tree type = TREE_VALUE (typelt);
4533 if (type == error_mark_node)
4535 if (!COMPLETE_TYPE_P (type))
4537 if (funcdef_flag && DECL_NAME (parm) != 0)
4538 error ("parameter `%s' has incomplete type",
4539 IDENTIFIER_POINTER (DECL_NAME (parm)));
4541 warning ("parameter has incomplete type");
4544 TREE_VALUE (typelt) = error_mark_node;
4545 TREE_TYPE (parm) = error_mark_node;
4548 typelt = TREE_CHAIN (typelt);
4555 /* Return a tree_list node with info on a parameter list just parsed.
4556 The TREE_PURPOSE is a list of decls of those parms.
4557 The TREE_VALUE is a list of structure, union and enum tags defined.
4558 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4559 The TREE_TYPE is a list of non-parameter decls which appeared with the
4561 This tree_list node is later fed to `grokparms'.
4563 VOID_AT_END nonzero means append `void' to the end of the type-list.
4564 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4567 get_parm_info (int void_at_end)
4569 tree decl, type, list;
4571 tree *last_type = &types;
4572 tree tags = current_scope->tags;
4573 tree parms = current_scope->parms;
4574 tree others = current_scope->names;
4575 static bool explained_incomplete_types = false;
4576 bool gave_void_only_once_err = false;
4578 /* Just "void" (and no ellipsis) is special. There are really no parms.
4579 But if the "void" is qualified (by "const" or "volatile"), or has a
4580 storage class specifier ("register"), then the behavior is undefined;
4581 issue an error. Typedefs for "void" are OK (see DR#157). */
4582 if (void_at_end && parms != 0
4583 && TREE_CHAIN (parms) == 0
4584 && VOID_TYPE_P (TREE_TYPE (parms))
4585 && !DECL_NAME (parms))
4587 if (TREE_THIS_VOLATILE (parms)
4588 || TREE_READONLY (parms)
4589 || DECL_REGISTER (parms))
4590 error ("\"void\" as only parameter may not be qualified");
4592 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4595 /* Sanity check all of the parameter declarations. */
4596 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4598 if (TREE_CODE (decl) != PARM_DECL)
4600 if (TREE_ASM_WRITTEN (decl))
4603 /* Since there is a prototype, args are passed in their
4604 declared types. The back end may override this. */
4605 type = TREE_TYPE (decl);
4606 DECL_ARG_TYPE (decl) = type;
4608 /* Check for (..., void, ...) and issue an error. */
4609 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4611 error ("\"void\" must be the only parameter");
4612 gave_void_only_once_err = true;
4615 type = build_tree_list (0, type);
4617 last_type = &TREE_CHAIN (type);
4620 /* Check the list of non-parameter decls for any forward parm decls
4621 that never got real decls. */
4622 for (decl = others; decl; decl = TREE_CHAIN (decl))
4623 if (TREE_CODE (decl) == PARM_DECL)
4625 if (!TREE_ASM_WRITTEN (decl))
4628 error ("%Jparameter \"%D\" has just a forward declaration",
4632 /* Warn about any struct, union or enum tags defined within this
4633 list. The scope of such types is limited to this declaration,
4634 which is rarely if ever desirable (it's impossible to call such
4635 a function with type-correct arguments). */
4636 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4638 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4639 const char *keyword;
4640 /* An anonymous union parm type is meaningful as a GNU extension.
4641 So don't warn for that. */
4642 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4645 /* The keyword should not be translated. */
4648 case RECORD_TYPE: keyword = "struct"; break;
4649 case UNION_TYPE: keyword = "union"; break;
4650 case ENUMERAL_TYPE: keyword = "enum"; break;
4654 if (TREE_PURPOSE (decl))
4655 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4656 warning ("\"%s %s\" declared inside parameter list",
4657 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4659 /* The %s will be one of 'struct', 'union', or 'enum'. */
4660 warning ("anonymous %s declared inside parameter list", keyword);
4662 if (! explained_incomplete_types)
4664 warning ("its scope is only this definition or declaration,"
4665 " which is probably not what you want");
4666 explained_incomplete_types = true;
4673 type = build_tree_list (0, void_type_node);
4677 list = tree_cons (parms, tags, types);
4678 TREE_TYPE (list) = others;
4682 /* Get the struct, enum or union (CODE says which) with tag NAME.
4683 Define the tag as a forward-reference if it is not defined. */
4686 xref_tag (enum tree_code code, tree name)
4688 /* If a cross reference is requested, look up the type
4689 already defined for this tag and return it. */
4691 tree ref = lookup_tag (code, name, 0);
4692 /* If this is the right type of tag, return what we found.
4693 (This reference will be shadowed by shadow_tag later if appropriate.)
4694 If this is the wrong type of tag, do not return it. If it was the
4695 wrong type in the same scope, we will have had an error
4696 message already; if in a different scope and declaring
4697 a name, pending_xref_error will give an error message; but if in a
4698 different scope and not declaring a name, this tag should
4699 shadow the previous declaration of a different type of tag, and
4700 this would not work properly if we return the reference found.
4701 (For example, with "struct foo" in an outer scope, "union foo;"
4702 must shadow that tag with a new one of union type.) */
4703 if (ref && TREE_CODE (ref) == code)
4706 /* If no such tag is yet defined, create a forward-reference node
4707 and record it as the "definition".
4708 When a real declaration of this type is found,
4709 the forward-reference will be altered into a real type. */
4711 ref = make_node (code);
4712 if (code == ENUMERAL_TYPE)
4714 /* Give the type a default layout like unsigned int
4715 to avoid crashing if it does not get defined. */
4716 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4717 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4718 TYPE_USER_ALIGN (ref) = 0;
4719 TREE_UNSIGNED (ref) = 1;
4720 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4721 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4722 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4725 pushtag (name, ref);
4730 /* Make sure that the tag NAME is defined *in the current scope*
4731 at least as a forward reference.
4732 CODE says which kind of tag NAME ought to be. */
4735 start_struct (enum tree_code code, tree name)
4737 /* If there is already a tag defined at this scope
4738 (as a forward reference), just return it. */
4743 ref = lookup_tag (code, name, 1);
4744 if (ref && TREE_CODE (ref) == code)
4746 if (TYPE_FIELDS (ref))
4748 if (code == UNION_TYPE)
4749 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4751 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4756 /* Otherwise create a forward-reference just so the tag is in scope. */
4758 ref = make_node (code);
4759 pushtag (name, ref);
4762 C_TYPE_BEING_DEFINED (ref) = 1;
4763 TYPE_PACKED (ref) = flag_pack_struct;
4767 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4768 of a structure component, returning a FIELD_DECL node.
4769 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4771 This is done during the parsing of the struct declaration.
4772 The FIELD_DECL nodes are chained together and the lot of them
4773 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4776 grokfield (tree declarator, tree declspecs, tree width)
4780 if (declarator == NULL_TREE && width == NULL_TREE)
4782 /* This is an unnamed decl.
4784 If we have something of the form "union { list } ;" then this
4785 is the anonymous union extension. Similarly for struct.
4787 If this is something of the form "struct foo;", then
4788 If MS extensions are enabled, this is handled as an
4790 Otherwise this is a forward declaration of a structure tag.
4792 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4793 If MS extensions are enabled and foo names a structure, then
4794 again this is an anonymous struct.
4795 Otherwise this is an error.
4797 Oh what a horrid tangled web we weave. I wonder if MS consciously
4798 took this from Plan 9 or if it was an accident of implementation
4799 that took root before someone noticed the bug... */
4801 tree type = TREE_VALUE (declspecs);
4803 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4804 type = TREE_TYPE (type);
4805 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4807 if (flag_ms_extensions)
4810 goto warn_unnamed_field;
4811 else if (TYPE_NAME (type) == NULL)
4814 goto warn_unnamed_field;
4819 warning ("declaration does not declare anything");
4824 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4825 width ? &width : NULL);
4827 finish_decl (value, NULL_TREE, NULL_TREE);
4828 DECL_INITIAL (value) = width;
4833 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4834 the list such that this does not present a problem later. */
4837 detect_field_duplicates (tree fieldlist)
4842 /* First, see if there are more than "a few" fields.
4843 This is trivially true if there are zero or one fields. */
4846 x = TREE_CHAIN (fieldlist);
4852 } while (timeout > 0 && x);
4854 /* If there were "few" fields, avoid the overhead of allocating
4855 a hash table. Instead just do the nested traversal thing. */
4858 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4861 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4862 if (DECL_NAME (y) == DECL_NAME (x))
4864 error ("%Jduplicate member '%D'", x, x);
4865 DECL_NAME (x) = NULL_TREE;
4871 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4874 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4875 if ((y = DECL_NAME (x)) != 0)
4877 slot = htab_find_slot (htab, y, INSERT);
4880 error ("%Jduplicate member '%D'", x, x);
4881 DECL_NAME (x) = NULL_TREE;
4890 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4891 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4892 ATTRIBUTES are attributes to be applied to the structure. */
4895 finish_struct (tree t, tree fieldlist, tree attributes)
4898 int toplevel = global_scope == current_scope;
4899 int saw_named_field;
4901 /* If this type was previously laid out as a forward reference,
4902 make sure we lay it out again. */
4906 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4908 /* Nameless union parm types are useful as GCC extension. */
4909 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4910 /* Otherwise, warn about any struct or union def. in parmlist. */
4911 if (in_parm_level_p ())
4914 pedwarn ("%s defined inside parms",
4915 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4917 warning ("%s defined inside parms",
4918 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4923 for (x = fieldlist; x; x = TREE_CHAIN (x))
4924 if (DECL_NAME (x) != 0)
4928 pedwarn ("%s has no %s",
4929 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4930 fieldlist ? _("named members") : _("members"));
4933 /* Install struct as DECL_CONTEXT of each field decl.
4934 Also process specified field sizes,m which is found in the DECL_INITIAL.
4935 Store 0 there, except for ": 0" fields (so we can find them
4936 and delete them, below). */
4938 saw_named_field = 0;
4939 for (x = fieldlist; x; x = TREE_CHAIN (x))
4941 DECL_CONTEXT (x) = t;
4942 DECL_PACKED (x) |= TYPE_PACKED (t);
4944 /* If any field is const, the structure type is pseudo-const. */
4945 if (TREE_READONLY (x))
4946 C_TYPE_FIELDS_READONLY (t) = 1;
4949 /* A field that is pseudo-const makes the structure likewise. */
4950 tree t1 = TREE_TYPE (x);
4951 while (TREE_CODE (t1) == ARRAY_TYPE)
4952 t1 = TREE_TYPE (t1);
4953 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4954 && C_TYPE_FIELDS_READONLY (t1))
4955 C_TYPE_FIELDS_READONLY (t) = 1;
4958 /* Any field that is volatile means variables of this type must be
4959 treated in some ways as volatile. */
4960 if (TREE_THIS_VOLATILE (x))
4961 C_TYPE_FIELDS_VOLATILE (t) = 1;
4963 /* Any field of nominal variable size implies structure is too. */
4964 if (C_DECL_VARIABLE_SIZE (x))
4965 C_TYPE_VARIABLE_SIZE (t) = 1;
4967 /* Detect invalid nested redefinition. */
4968 if (TREE_TYPE (x) == t)
4969 error ("nested redefinition of `%s'",
4970 IDENTIFIER_POINTER (TYPE_NAME (t)));
4972 if (DECL_INITIAL (x))
4974 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
4975 DECL_SIZE (x) = bitsize_int (width);
4976 DECL_BIT_FIELD (x) = 1;
4977 SET_DECL_C_BIT_FIELD (x);
4980 DECL_INITIAL (x) = 0;
4982 /* Detect flexible array member in an invalid context. */
4983 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4984 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4985 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4986 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4988 if (TREE_CODE (t) == UNION_TYPE)
4989 error ("%Jflexible array member in union", x);
4990 else if (TREE_CHAIN (x) != NULL_TREE)
4991 error ("%Jflexible array member not at end of struct", x);
4992 else if (! saw_named_field)
4993 error ("%Jflexible array member in otherwise empty struct", x);
4996 if (pedantic && TREE_CODE (t) == RECORD_TYPE
4997 && flexible_array_type_p (TREE_TYPE (x)))
4998 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5001 saw_named_field = 1;
5004 detect_field_duplicates (fieldlist);
5006 /* Now we have the nearly final fieldlist. Record it,
5007 then lay out the structure or union (including the fields). */
5009 TYPE_FIELDS (t) = fieldlist;
5013 /* Delete all zero-width bit-fields from the fieldlist. */
5015 tree *fieldlistp = &fieldlist;
5017 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5018 *fieldlistp = TREE_CHAIN (*fieldlistp);
5020 fieldlistp = &TREE_CHAIN (*fieldlistp);
5023 /* Now we have the truly final field list.
5024 Store it in this type and in the variants. */
5026 TYPE_FIELDS (t) = fieldlist;
5028 /* If there are lots of fields, sort so we can look through them fast.
5029 We arbitrarily consider 16 or more elts to be "a lot". */
5034 for (x = fieldlist; x; x = TREE_CHAIN (x))
5036 if (len > 15 || DECL_NAME (x) == NULL)
5044 struct lang_type *space;
5045 struct sorted_fields_type *space2;
5047 len += list_length (x);
5049 /* Use the same allocation policy here that make_node uses, to
5050 ensure that this lives as long as the rest of the struct decl.
5051 All decls in an inline function need to be saved. */
5053 space = ggc_alloc (sizeof (struct lang_type));
5054 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5058 field_array = &space2->elts[0];
5059 for (x = fieldlist; x; x = TREE_CHAIN (x))
5061 field_array[len++] = x;
5063 /* If there is anonymous struct or union, break out of the loop. */
5064 if (DECL_NAME (x) == NULL)
5067 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5070 TYPE_LANG_SPECIFIC (t) = space;
5071 TYPE_LANG_SPECIFIC (t)->s->len = len;
5072 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5073 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5078 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5080 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5081 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5082 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5083 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5086 /* If this was supposed to be a transparent union, but we can't
5087 make it one, warn and turn off the flag. */
5088 if (TREE_CODE (t) == UNION_TYPE
5089 && TYPE_TRANSPARENT_UNION (t)
5090 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5092 TYPE_TRANSPARENT_UNION (t) = 0;
5093 warning ("union cannot be made transparent");
5096 /* If this structure or union completes the type of any previous
5097 variable declaration, lay it out and output its rtl. */
5098 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5102 tree decl = TREE_VALUE (x);
5103 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5104 layout_array_type (TREE_TYPE (decl));
5105 if (TREE_CODE (decl) != TYPE_DECL)
5107 layout_decl (decl, 0);
5108 if (c_dialect_objc ())
5109 objc_check_decl (decl);
5110 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5115 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5117 /* Finish debugging output for this type. */
5118 rest_of_type_compilation (t, toplevel);
5123 /* Lay out the type T, and its element type, and so on. */
5126 layout_array_type (tree t)
5128 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5129 layout_array_type (TREE_TYPE (t));
5133 /* Begin compiling the definition of an enumeration type.
5134 NAME is its name (or null if anonymous).
5135 Returns the type object, as yet incomplete.
5136 Also records info about it so that build_enumerator
5137 may be used to declare the individual values as they are read. */
5140 start_enum (tree name)
5144 /* If this is the real definition for a previous forward reference,
5145 fill in the contents in the same object that used to be the
5146 forward reference. */
5149 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5151 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5153 enumtype = make_node (ENUMERAL_TYPE);
5154 pushtag (name, enumtype);
5157 C_TYPE_BEING_DEFINED (enumtype) = 1;
5159 if (TYPE_VALUES (enumtype) != 0)
5161 /* This enum is a named one that has been declared already. */
5162 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5164 /* Completely replace its old definition.
5165 The old enumerators remain defined, however. */
5166 TYPE_VALUES (enumtype) = 0;
5169 enum_next_value = integer_zero_node;
5172 if (flag_short_enums)
5173 TYPE_PACKED (enumtype) = 1;
5178 /* After processing and defining all the values of an enumeration type,
5179 install their decls in the enumeration type and finish it off.
5180 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5181 and ATTRIBUTES are the specified attributes.
5182 Returns ENUMTYPE. */
5185 finish_enum (tree enumtype, tree values, tree attributes)
5188 tree minnode = 0, maxnode = 0, enum_value_type;
5189 int precision, unsign;
5190 int toplevel = (global_scope == current_scope);
5192 if (in_parm_level_p ())
5193 warning ("enum defined inside parms");
5195 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5197 /* Calculate the maximum value of any enumerator in this type. */
5199 if (values == error_mark_node)
5200 minnode = maxnode = integer_zero_node;
5203 minnode = maxnode = TREE_VALUE (values);
5204 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5206 tree value = TREE_VALUE (pair);
5207 if (tree_int_cst_lt (maxnode, value))
5209 if (tree_int_cst_lt (value, minnode))
5214 /* Construct the final type of this enumeration. It is the same
5215 as one of the integral types - the narrowest one that fits, except
5216 that normally we only go as narrow as int - and signed iff any of
5217 the values are negative. */
5218 unsign = (tree_int_cst_sgn (minnode) >= 0);
5219 precision = MAX (min_precision (minnode, unsign),
5220 min_precision (maxnode, unsign));
5221 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5223 tree narrowest = c_common_type_for_size (precision, unsign);
5226 warning ("enumeration values exceed range of largest integer");
5227 narrowest = long_long_integer_type_node;
5230 precision = TYPE_PRECISION (narrowest);
5233 precision = TYPE_PRECISION (integer_type_node);
5235 if (precision == TYPE_PRECISION (integer_type_node))
5236 enum_value_type = c_common_type_for_size (precision, 0);
5238 enum_value_type = enumtype;
5240 TYPE_MIN_VALUE (enumtype) = minnode;
5241 TYPE_MAX_VALUE (enumtype) = maxnode;
5242 TYPE_PRECISION (enumtype) = precision;
5243 TREE_UNSIGNED (enumtype) = unsign;
5244 TYPE_SIZE (enumtype) = 0;
5245 layout_type (enumtype);
5247 if (values != error_mark_node)
5249 /* Change the type of the enumerators to be the enum type. We
5250 need to do this irrespective of the size of the enum, for
5251 proper type checking. Replace the DECL_INITIALs of the
5252 enumerators, and the value slots of the list, with copies
5253 that have the enum type; they cannot be modified in place
5254 because they may be shared (e.g. integer_zero_node) Finally,
5255 change the purpose slots to point to the names of the decls. */
5256 for (pair = values; pair; pair = TREE_CHAIN (pair))
5258 tree enu = TREE_PURPOSE (pair);
5260 TREE_TYPE (enu) = enumtype;
5262 /* The ISO C Standard mandates enumerators to have type int,
5263 even though the underlying type of an enum type is
5264 unspecified. Here we convert any enumerators that fit in
5265 an int to type int, to avoid promotions to unsigned types
5266 when comparing integers with enumerators that fit in the
5267 int range. When -pedantic is given, build_enumerator()
5268 would have already taken care of those that don't fit. */
5269 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5270 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5272 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5274 TREE_PURPOSE (pair) = DECL_NAME (enu);
5275 TREE_VALUE (pair) = DECL_INITIAL (enu);
5278 TYPE_VALUES (enumtype) = values;
5281 /* Fix up all variant types of this enum type. */
5282 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5284 if (tem == enumtype)
5286 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5287 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5288 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5289 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5290 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5291 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5292 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5293 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5294 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5295 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5298 /* Finish debugging output for this type. */
5299 rest_of_type_compilation (enumtype, toplevel);
5304 /* Build and install a CONST_DECL for one value of the
5305 current enumeration type (one that was begun with start_enum).
5306 Return a tree-list containing the CONST_DECL and its value.
5307 Assignment of sequential values by default is handled here. */
5310 build_enumerator (tree name, tree value)
5314 /* Validate and default VALUE. */
5316 /* Remove no-op casts from the value. */
5318 STRIP_TYPE_NOPS (value);
5322 if (TREE_CODE (value) == INTEGER_CST)
5324 value = default_conversion (value);
5325 constant_expression_warning (value);
5329 error ("enumerator value for `%s' not integer constant",
5330 IDENTIFIER_POINTER (name));
5335 /* Default based on previous value. */
5336 /* It should no longer be possible to have NON_LVALUE_EXPR
5340 value = enum_next_value;
5342 error ("overflow in enumeration values");
5345 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5347 pedwarn ("ISO C restricts enumerator values to range of `int'");
5348 value = convert (integer_type_node, value);
5351 /* Set basis for default for next value. */
5352 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5353 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5355 /* Now create a declaration for the enum value name. */
5357 type = TREE_TYPE (value);
5358 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5359 TYPE_PRECISION (integer_type_node)),
5360 (TYPE_PRECISION (type)
5361 >= TYPE_PRECISION (integer_type_node)
5362 && TREE_UNSIGNED (type)));
5364 decl = build_decl (CONST_DECL, name, type);
5365 DECL_INITIAL (decl) = convert (type, value);
5368 return tree_cons (decl, value, NULL_TREE);
5372 /* Create the FUNCTION_DECL for a function definition.
5373 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5374 the declaration; they describe the function's name and the type it returns,
5375 but twisted together in a fashion that parallels the syntax of C.
5377 This function creates a binding context for the function body
5378 as well as setting up the FUNCTION_DECL in current_function_decl.
5380 Returns 1 on success. If the DECLARATOR is not suitable for a function
5381 (it defines a datum instead), we return 0, which tells
5382 yyparse to report a parse error. */
5385 start_function (tree declspecs, tree declarator, tree attributes)
5387 tree decl1, old_decl;
5389 int old_immediate_size_expand = immediate_size_expand;
5391 current_function_returns_value = 0; /* Assume, until we see it does. */
5392 current_function_returns_null = 0;
5393 current_function_returns_abnormally = 0;
5394 warn_about_return_type = 0;
5395 current_extern_inline = 0;
5396 c_in_iteration_stmt = 0;
5399 /* Don't expand any sizes in the return type of the function. */
5400 immediate_size_expand = 0;
5402 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5404 /* If the declarator is not suitable for a function definition,
5405 cause a syntax error. */
5408 immediate_size_expand = old_immediate_size_expand;
5412 decl_attributes (&decl1, attributes, 0);
5414 if (DECL_DECLARED_INLINE_P (decl1)
5415 && DECL_UNINLINABLE (decl1)
5416 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5417 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5419 announce_function (decl1);
5421 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5423 error ("return type is an incomplete type");
5424 /* Make it return void instead. */
5426 = build_function_type (void_type_node,
5427 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5430 if (warn_about_return_type)
5431 pedwarn_c99 ("return type defaults to `int'");
5433 /* Save the parm names or decls from this function's declarator
5434 where store_parm_decls will find them. */
5435 current_function_parms = last_function_parms;
5436 current_function_parm_tags = last_function_parm_tags;
5437 current_function_parm_others = last_function_parm_others;
5439 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5440 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5441 DECL_INITIAL (decl1) = error_mark_node;
5443 /* If this definition isn't a prototype and we had a prototype declaration
5444 before, copy the arg type info from that prototype.
5445 But not if what we had before was a builtin function. */
5446 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5447 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5448 && !DECL_BUILT_IN (old_decl)
5449 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5450 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5451 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5453 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5454 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5457 /* Optionally warn of old-fashioned def with no previous prototype. */
5458 if (warn_strict_prototypes
5459 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5460 && C_DECL_ISNT_PROTOTYPE (old_decl))
5461 warning ("function declaration isn't a prototype");
5462 /* Optionally warn of any global def with no previous prototype. */
5463 else if (warn_missing_prototypes
5464 && TREE_PUBLIC (decl1)
5465 && ! MAIN_NAME_P (DECL_NAME (decl1))
5466 && C_DECL_ISNT_PROTOTYPE (old_decl))
5467 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5468 /* Optionally warn of any def with no previous prototype
5469 if the function has already been used. */
5470 else if (warn_missing_prototypes
5471 && old_decl != 0 && TREE_USED (old_decl)
5472 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5473 warning ("%J'%D' was used with no prototype before its definition",
5475 /* Optionally warn of any global def with no previous declaration. */
5476 else if (warn_missing_declarations
5477 && TREE_PUBLIC (decl1)
5479 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5480 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5481 /* Optionally warn of any def with no previous declaration
5482 if the function has already been used. */
5483 else if (warn_missing_declarations
5484 && old_decl != 0 && TREE_USED (old_decl)
5485 && C_DECL_IMPLICIT (old_decl))
5486 warning ("%J`%D' was used with no declaration before its definition",
5489 /* This is a definition, not a reference.
5490 So normally clear DECL_EXTERNAL.
5491 However, `extern inline' acts like a declaration
5492 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5493 DECL_EXTERNAL (decl1) = current_extern_inline;
5495 /* This function exists in static storage.
5496 (This does not mean `static' in the C sense!) */
5497 TREE_STATIC (decl1) = 1;
5499 /* A nested function is not global. */
5500 if (current_function_decl != 0)
5501 TREE_PUBLIC (decl1) = 0;
5503 #ifdef ENABLE_CHECKING
5504 /* This is the earliest point at which we might know the assembler
5505 name of the function. Thus, if it's set before this, die horribly. */
5506 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5510 /* If #pragma weak was used, mark the decl weak now. */
5511 if (current_scope == global_scope)
5512 maybe_apply_pragma_weak (decl1);
5514 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5515 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5520 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5521 != integer_type_node)
5522 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5524 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5525 args = TREE_CHAIN (args))
5527 tree type = args ? TREE_VALUE (args) : 0;
5529 if (type == void_type_node)
5536 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5537 pedwarn ("%Jfirst argument of '%D' should be `int'",
5542 if (TREE_CODE (type) != POINTER_TYPE
5543 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5544 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5546 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5551 if (TREE_CODE (type) != POINTER_TYPE
5552 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5553 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5555 pedwarn ("%Jthird argument of '%D' should probably be "
5556 "'char **'", decl1, decl1);
5561 /* It is intentional that this message does not mention the third
5562 argument because it's only mentioned in an appendix of the
5564 if (argct > 0 && (argct < 2 || argct > 3))
5565 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5567 if (! TREE_PUBLIC (decl1))
5568 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5571 /* Record the decl so that the function name is defined.
5572 If we already have a decl for this name, and it is a FUNCTION_DECL,
5573 use the old decl. */
5575 current_function_decl = pushdecl (decl1);
5578 declare_parm_level ();
5580 make_decl_rtl (current_function_decl, NULL);
5582 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5583 /* Promote the value to int before returning it. */
5584 if (c_promoting_integer_type_p (restype))
5586 /* It retains unsignedness if not really getting wider. */
5587 if (TREE_UNSIGNED (restype)
5588 && (TYPE_PRECISION (restype)
5589 == TYPE_PRECISION (integer_type_node)))
5590 restype = unsigned_type_node;
5592 restype = integer_type_node;
5594 DECL_RESULT (current_function_decl)
5595 = build_decl (RESULT_DECL, NULL_TREE, restype);
5597 /* If this fcn was already referenced via a block-scope `extern' decl
5598 (or an implicit decl), propagate certain information about the usage. */
5599 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5600 TREE_ADDRESSABLE (current_function_decl) = 1;
5602 immediate_size_expand = old_immediate_size_expand;
5604 start_fname_decls ();
5609 /* Subroutine of store_parm_decls which handles new-style function
5610 definitions (prototype format). The parms already have decls, so we
5611 need only record them as in effect and complain if any redundant
5612 old-style parm decls were written. */
5614 store_parm_decls_newstyle (void)
5617 tree fndecl = current_function_decl;
5618 tree parms = current_function_parms;
5619 tree tags = current_function_parm_tags;
5620 tree others = current_function_parm_others;
5622 if (current_scope->parms || current_scope->names || current_scope->tags)
5624 error ("%Jold-style parameter declarations in prototyped "
5625 "function definition", fndecl);
5627 /* Get rid of the old-style declarations. */
5632 /* Now make all the parameter declarations visible in the function body.
5633 We can bypass most of the grunt work of pushdecl. */
5634 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5636 DECL_CONTEXT (decl) = current_function_decl;
5637 if (DECL_NAME (decl) == 0)
5638 error ("%Jparameter name omitted", decl);
5641 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5642 current_scope->shadowed
5643 = tree_cons (DECL_NAME (decl),
5644 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5645 current_scope->shadowed);
5646 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5649 current_scope->parms = parms;
5650 current_scope->parms_last = last;
5652 /* Record the parameter list in the function declaration. */
5653 DECL_ARGUMENTS (fndecl) = parms;
5655 /* Now make all the ancillary declarations visible, likewise. */
5656 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5658 DECL_CONTEXT (decl) = current_function_decl;
5659 if (DECL_NAME (decl)
5660 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5662 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5663 current_scope->shadowed
5664 = tree_cons (DECL_NAME (decl),
5665 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5666 current_scope->shadowed);
5667 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5670 current_scope->names = others;
5671 current_scope->names_last = last;
5673 /* And all the tag declarations. */
5674 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5675 if (TREE_PURPOSE (decl))
5677 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5678 current_scope->shadowed_tags
5679 = tree_cons (TREE_PURPOSE (decl),
5680 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5681 current_scope->shadowed_tags);
5682 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5684 current_scope->tags = tags;
5687 /* Subroutine of store_parm_decls which handles old-style function
5688 definitions (separate parameter list and declarations). */
5691 store_parm_decls_oldstyle (void)
5693 tree parm, decl, last;
5694 tree fndecl = current_function_decl;
5696 /* This is the identifier list from the function declarator. */
5697 tree parmids = current_function_parms;
5699 /* We use DECL_WEAK as a flag to show which parameters have been
5700 seen already, since it is not used on PARM_DECL. */
5701 #ifdef ENABLE_CHECKING
5702 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5703 if (DECL_WEAK (parm))
5707 /* Match each formal parameter name with its declaration. Save each
5708 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5709 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5711 if (TREE_VALUE (parm) == 0)
5713 error ("%Jparameter name missing from parameter list", fndecl);
5714 TREE_PURPOSE (parm) = 0;
5718 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5719 if (decl && DECL_CONTEXT (decl) == fndecl)
5721 /* If we got something other than a PARM_DECL it is an error. */
5722 if (TREE_CODE (decl) != PARM_DECL)
5723 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5724 /* If the declaration is already marked, we have a duplicate
5725 name. Complain and ignore the duplicate. */
5726 else if (DECL_WEAK (decl))
5728 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5729 TREE_PURPOSE (parm) = 0;
5732 /* If the declaration says "void", complain and turn it into
5734 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5736 error ("%Jparameter \"%D\" declared void", decl, decl);
5737 TREE_TYPE (decl) = integer_type_node;
5738 DECL_ARG_TYPE (decl) = integer_type_node;
5739 layout_decl (decl, 0);
5742 /* If no declaration found, default to int. */
5745 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5746 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5747 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5751 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5752 else if (extra_warnings)
5753 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5756 TREE_PURPOSE (parm) = decl;
5757 DECL_WEAK (decl) = 1;
5760 /* Now examine the parms chain for incomplete declarations
5761 and declarations with no corresponding names. */
5763 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5765 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5767 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5768 TREE_TYPE (parm) = error_mark_node;
5771 if (! DECL_WEAK (parm))
5773 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5776 /* Pretend the parameter was not missing.
5777 This gets us to a standard state and minimizes
5778 further error messages. */
5779 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5783 /* Chain the declarations together in the order of the list of
5784 names. Store that chain in the function decl, replacing the
5785 list of names. Update the current scope to match. */
5786 DECL_ARGUMENTS (fndecl) = 0;
5788 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5789 if (TREE_PURPOSE (parm))
5791 if (parm && TREE_PURPOSE (parm))
5793 last = TREE_PURPOSE (parm);
5794 DECL_ARGUMENTS (fndecl) = last;
5795 current_scope->parms = last;
5796 DECL_WEAK (last) = 0;
5798 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5799 if (TREE_PURPOSE (parm))
5801 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5802 last = TREE_PURPOSE (parm);
5803 DECL_WEAK (last) = 0;
5805 current_scope->parms_last = last;
5806 TREE_CHAIN (last) = 0;
5809 /* If there was a previous prototype,
5810 set the DECL_ARG_TYPE of each argument according to
5811 the type previously specified, and report any mismatches. */
5813 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5816 for (parm = DECL_ARGUMENTS (fndecl),
5817 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5818 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5819 != void_type_node));
5820 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5822 if (parm == 0 || type == 0
5823 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5825 error ("number of arguments doesn't match prototype");
5826 error ("%Hprototype declaration",
5827 ¤t_function_prototype_locus);
5830 /* Type for passing arg must be consistent with that
5831 declared for the arg. ISO C says we take the unqualified
5832 type for parameters declared with qualified type. */
5833 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5834 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5837 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5838 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5840 /* Adjust argument to match prototype. E.g. a previous
5841 `int foo(float);' prototype causes
5842 `int foo(x) float x; {...}' to be treated like
5843 `int foo(float x) {...}'. This is particularly
5844 useful for argument types like uid_t. */
5845 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5847 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5848 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5849 && TYPE_PRECISION (TREE_TYPE (parm))
5850 < TYPE_PRECISION (integer_type_node))
5851 DECL_ARG_TYPE (parm) = integer_type_node;
5855 pedwarn ("promoted argument \"%D\" "
5856 "doesn't match prototype", parm);
5857 pedwarn ("%Hprototype declaration",
5858 ¤t_function_prototype_locus);
5863 error ("argument \"%D\" doesn't match prototype", parm);
5864 error ("%Hprototype declaration",
5865 ¤t_function_prototype_locus);
5869 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5872 /* Otherwise, create a prototype that would match. */
5876 tree actual = 0, last = 0, type;
5878 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5880 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5882 TREE_CHAIN (last) = type;
5887 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5889 TREE_CHAIN (last) = type;
5893 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5894 of the type of this function, but we need to avoid having this
5895 affect the types of other similarly-typed functions, so we must
5896 first force the generation of an identical (but separate) type
5897 node for the relevant function type. The new node we create
5898 will be a variant of the main variant of the original function
5901 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5903 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5907 /* Store the parameter declarations into the current function declaration.
5908 This is called after parsing the parameter declarations, before
5909 digesting the body of the function.
5911 For an old-style definition, construct a prototype out of the old-style
5912 parameter declarations and inject it into the function's type. */
5915 store_parm_decls (void)
5917 tree fndecl = current_function_decl;
5919 /* The function containing FNDECL, if any. */
5920 tree context = decl_function_context (fndecl);
5922 /* True if this definition is written with a prototype. */
5923 bool prototype = (current_function_parms
5924 && TREE_CODE (current_function_parms) != TREE_LIST);
5927 store_parm_decls_newstyle ();
5929 store_parm_decls_oldstyle ();
5931 /* The next call to pushlevel will be a function body. */
5933 next_is_function_body = true;
5935 /* Write a record describing this function definition to the prototypes
5936 file (if requested). */
5938 gen_aux_info_record (fndecl, 1, 0, prototype);
5940 /* Initialize the RTL code for the function. */
5941 allocate_struct_function (fndecl);
5943 /* Begin the statement tree for this function. */
5944 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5946 /* If this is a nested function, save away the sizes of any
5947 variable-size types so that we can expand them when generating
5953 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5954 = nreverse (get_pending_sizes ());
5955 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5958 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
5961 /* This function is being processed in whole-function mode. */
5962 cfun->x_whole_function_mode_p = 1;
5964 /* Even though we're inside a function body, we still don't want to
5965 call expand_expr to calculate the size of a variable-sized array.
5966 We haven't necessarily assigned RTL to all variables yet, so it's
5967 not safe to try to expand expressions involving them. */
5968 immediate_size_expand = 0;
5969 cfun->x_dont_save_pending_sizes_p = 1;
5972 /* Finish up a function declaration and compile that function
5973 all the way to assembler language output. The free the storage
5974 for the function definition.
5976 This is called after parsing the body of the function definition. */
5979 finish_function (void)
5981 tree fndecl = current_function_decl;
5983 /* When a function declaration is totally empty, e.g.
5985 (the argument list is irrelevant) the compstmt rule will not
5986 bother calling pushlevel/poplevel, which means we get here with
5987 the scope stack out of sync. Detect this situation by noticing
5988 that current_scope is still as store_parm_decls left it, and do
5989 a dummy push/pop to get back to consistency.
5990 Note that the call to pushlevel does not actually push another
5991 scope - see there for details. */
5993 if (current_scope->parm_flag && next_is_function_body)
5999 if (TREE_CODE (fndecl) == FUNCTION_DECL
6000 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6002 tree args = DECL_ARGUMENTS (fndecl);
6003 for (; args; args = TREE_CHAIN (args))
6005 tree type = TREE_TYPE (args);
6006 if (INTEGRAL_TYPE_P (type)
6007 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6008 DECL_ARG_TYPE (args) = integer_type_node;
6012 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6013 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6015 /* Must mark the RESULT_DECL as being in this function. */
6017 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6018 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6020 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6022 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6023 != integer_type_node)
6025 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6026 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6028 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6032 #ifdef DEFAULT_MAIN_RETURN
6033 /* Make it so that `main' always returns success by default. */
6034 DEFAULT_MAIN_RETURN;
6037 c_expand_return (integer_zero_node);
6042 finish_fname_decls ();
6044 /* Tie off the statement tree for this function. */
6045 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6047 /* Complain if there's just no return statement. */
6048 if (warn_return_type
6049 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6050 && !current_function_returns_value && !current_function_returns_null
6051 /* Don't complain if we abort. */
6052 && !current_function_returns_abnormally
6053 /* Don't warn for main(). */
6054 && !MAIN_NAME_P (DECL_NAME (fndecl))
6055 /* Or if they didn't actually specify a return type. */
6056 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6057 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6058 inline function, as we might never be compiled separately. */
6059 && DECL_INLINE (fndecl))
6060 warning ("no return statement in function returning non-void");
6062 /* With just -Wextra, complain only if function returns both with
6063 and without a value. */
6065 && current_function_returns_value
6066 && current_function_returns_null)
6067 warning ("this function may return with or without a value");
6069 /* We're leaving the context of this function, so zap cfun. It's still in
6070 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6073 /* ??? Objc emits functions after finalizing the compilation unit.
6074 This should be cleaned up later and this conditional removed. */
6075 if (!cgraph_global_info_ready)
6076 cgraph_finalize_function (fndecl, false);
6078 c_expand_body (fndecl);
6079 current_function_decl = NULL;
6082 /* Generate the RTL for a deferred function FNDECL. */
6085 c_expand_deferred_function (tree fndecl)
6087 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6088 function was deferred, e.g. in duplicate_decls. */
6089 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6091 if (flag_inline_trees)
6093 timevar_push (TV_INTEGRATION);
6094 optimize_inline_calls (fndecl);
6095 timevar_pop (TV_INTEGRATION);
6097 c_expand_body (fndecl);
6098 current_function_decl = NULL;
6102 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6103 then we are already in the process of generating RTL for another
6107 c_expand_body_1 (tree fndecl, int nested_p)
6111 /* Make sure that we will evaluate variable-sized types involved
6112 in our function's type. */
6113 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6115 /* Squirrel away our current state. */
6116 push_function_context ();
6119 tree_rest_of_compilation (fndecl, nested_p);
6122 /* Return to the enclosing function. */
6123 pop_function_context ();
6125 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6127 if (targetm.have_ctors_dtors)
6128 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6129 DEFAULT_INIT_PRIORITY);
6131 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6134 if (DECL_STATIC_DESTRUCTOR (fndecl))
6136 if (targetm.have_ctors_dtors)
6137 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6138 DEFAULT_INIT_PRIORITY);
6140 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6144 /* Like c_expand_body_1 but only for unnested functions. */
6147 c_expand_body (tree fndecl)
6150 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6151 c_expand_body_1 (fndecl, 0);
6154 /* Check the declarations given in a for-loop for satisfying the C99
6157 check_for_loop_decls (void)
6163 /* If we get here, declarations have been used in a for loop without
6164 the C99 for loop scope. This doesn't make much sense, so don't
6166 error ("'for' loop initial declaration used outside C99 mode");
6169 /* C99 subclause 6.8.5 paragraph 3:
6171 [#3] The declaration part of a for statement shall only
6172 declare identifiers for objects having storage class auto or
6175 It isn't clear whether, in this sentence, "identifiers" binds to
6176 "shall only declare" or to "objects" - that is, whether all identifiers
6177 declared must be identifiers for objects, or whether the restriction
6178 only applies to those that are. (A question on this in comp.std.c
6179 in November 2000 received no answer.) We implement the strictest
6180 interpretation, to avoid creating an extension which later causes
6183 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6185 if (TREE_PURPOSE (t) != 0)
6187 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6189 if (code == RECORD_TYPE)
6190 error ("'struct %s' declared in 'for' loop initial declaration",
6191 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6192 else if (code == UNION_TYPE)
6193 error ("'union %s' declared in 'for' loop initial declaration",
6194 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6196 error ("'enum %s' declared in 'for' loop initial declaration",
6197 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6201 for (t = current_scope->names; t; t = TREE_CHAIN (t))
6203 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6204 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6205 "initial declaration", t, t);
6206 else if (TREE_STATIC (t))
6207 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6208 "initial declaration", t, t);
6209 else if (DECL_EXTERNAL (t))
6210 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6211 "initial declaration", t, t);
6215 /* Save and reinitialize the variables
6216 used during compilation of a C function. */
6219 c_push_function_context (struct function *f)
6221 struct language_function *p;
6222 p = ggc_alloc (sizeof (struct language_function));
6225 p->base.x_stmt_tree = c_stmt_tree;
6226 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6227 p->x_in_iteration_stmt = c_in_iteration_stmt;
6228 p->x_in_case_stmt = c_in_case_stmt;
6229 p->returns_value = current_function_returns_value;
6230 p->returns_null = current_function_returns_null;
6231 p->returns_abnormally = current_function_returns_abnormally;
6232 p->warn_about_return_type = warn_about_return_type;
6233 p->extern_inline = current_extern_inline;
6236 /* Restore the variables used during compilation of a C function. */
6239 c_pop_function_context (struct function *f)
6241 struct language_function *p = f->language;
6243 if (DECL_SAVED_INSNS (current_function_decl) == 0
6244 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6246 /* Stop pointing to the local nodes about to be freed. */
6247 /* But DECL_INITIAL must remain nonzero so we know this
6248 was an actual function definition. */
6249 DECL_INITIAL (current_function_decl) = error_mark_node;
6250 DECL_ARGUMENTS (current_function_decl) = 0;
6253 c_stmt_tree = p->base.x_stmt_tree;
6254 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6255 c_in_iteration_stmt = p->x_in_iteration_stmt;
6256 c_in_case_stmt = p->x_in_case_stmt;
6257 current_function_returns_value = p->returns_value;
6258 current_function_returns_null = p->returns_null;
6259 current_function_returns_abnormally = p->returns_abnormally;
6260 warn_about_return_type = p->warn_about_return_type;
6261 current_extern_inline = p->extern_inline;
6266 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6269 c_dup_lang_specific_decl (tree decl)
6271 struct lang_decl *ld;
6273 if (!DECL_LANG_SPECIFIC (decl))
6276 ld = ggc_alloc (sizeof (struct lang_decl));
6277 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6278 DECL_LANG_SPECIFIC (decl) = ld;
6281 /* The functions below are required for functionality of doing
6282 function at once processing in the C front end. Currently these
6283 functions are not called from anywhere in the C front end, but as
6284 these changes continue, that will change. */
6286 /* Returns nonzero if the current statement is a full expression,
6287 i.e. temporaries created during that statement should be destroyed
6288 at the end of the statement. */
6291 stmts_are_full_exprs_p (void)
6296 /* Returns the stmt_tree (if any) to which statements are currently
6297 being added. If there is no active statement-tree, NULL is
6301 current_stmt_tree (void)
6303 return &c_stmt_tree;
6306 /* Returns the stack of SCOPE_STMTs for the current function. */
6309 current_scope_stmt_stack (void)
6311 return &c_scope_stmt_stack;
6314 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6318 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6323 /* Dummy function in place of callback used by C++. */
6326 extract_interface_info (void)
6330 /* Return a new COMPOUND_STMT, after adding it to the current
6334 c_begin_compound_stmt (void)
6338 /* Create the COMPOUND_STMT. */
6339 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6344 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6348 c_expand_decl_stmt (tree t)
6350 tree decl = DECL_STMT_DECL (t);
6352 /* Expand nested functions. */
6353 if (TREE_CODE (decl) == FUNCTION_DECL
6354 && DECL_CONTEXT (decl) == current_function_decl
6355 && DECL_SAVED_TREE (decl))
6356 c_expand_body_1 (decl, 1);
6359 /* Return the global value of T as a symbol. */
6362 identifier_global_value (tree t)
6364 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6365 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6368 /* Shadowed by something else; find the true global value. */
6369 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6370 if (DECL_NAME (decl) == t)
6373 /* Only local values for this decl. */
6377 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6378 otherwise the name is found in ridpointers from RID_INDEX. */
6381 record_builtin_type (enum rid rid_index, const char *name, tree type)
6386 id = ridpointers[(int) rid_index];
6388 id = get_identifier (name);
6389 tdecl = build_decl (TYPE_DECL, id, type);
6391 debug_hooks->type_decl (tdecl, 0);
6394 /* Build the void_list_node (void_type_node having been created). */
6396 build_void_list_node (void)
6398 tree t = build_tree_list (NULL_TREE, void_type_node);
6402 /* Return something to represent absolute declarators containing a *.
6403 TARGET is the absolute declarator that the * contains.
6404 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6405 to apply to the pointer type, represented as identifiers, possible mixed
6408 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6409 if attributes are present) and whose type is the modifier list. */
6412 make_pointer_declarator (tree type_quals_attrs, tree target)
6415 tree itarget = target;
6416 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6417 if (attrs != NULL_TREE)
6418 itarget = tree_cons (attrs, target, NULL_TREE);
6419 return build1 (INDIRECT_REF, quals, itarget);
6422 /* A wrapper around lhd_set_decl_assembler_name that gives static
6423 variables their C names if they are at file scope and only one
6424 translation unit is being compiled, for backwards compatibility
6425 with certain bizarre assembler hacks (like crtstuff.c). */
6428 c_static_assembler_name (tree decl)
6430 if (num_in_fnames == 1
6431 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6432 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6433 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6435 lhd_set_decl_assembler_name (decl);
6438 /* Hash and equality functions for link_hash_table: key off
6439 DECL_ASSEMBLER_NAME. */
6442 link_hash_hash (const void *x_p)
6445 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6449 link_hash_eq (const void *x1_p, const void *x2_p)
6451 tree x1 = (tree)x1_p;
6452 tree x2 = (tree)x2_p;
6453 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6456 /* Propagate information between definitions and uses between multiple
6457 translation units in TU_LIST based on linkage rules. */
6460 merge_translation_unit_decls (void)
6462 const tree tu_list = current_file_decl;
6465 htab_t link_hash_table;
6468 /* Create the BLOCK that poplevel would have created, but don't
6469 actually call poplevel since that's expensive. */
6470 block = make_node (BLOCK);
6471 BLOCK_VARS (block) = current_scope->names;
6472 TREE_USED (block) = 1;
6473 DECL_INITIAL (current_file_decl) = block;
6475 /* If only one translation unit seen, no copying necessary. */
6476 if (TREE_CHAIN (tu_list) == NULL_TREE)
6479 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6481 /* Enter any actual definitions into the hash table. */
6482 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6483 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6484 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6487 slot = htab_find_slot (link_hash_table, decl, INSERT);
6489 /* If we've already got a definition, work out which one is
6490 the real one, put it into the hash table, and make the
6491 other one DECL_EXTERNAL. This is important to avoid
6492 putting out two definitions of the same symbol in the
6496 tree old_decl = (tree) *slot;
6498 /* If this is weak or common or whatever, suppress it
6499 in favor of the other definition. */
6500 if (DECL_WEAK (decl))
6501 DECL_EXTERNAL (decl) = 1;
6502 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6503 DECL_EXTERNAL (old_decl) = 1;
6504 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6505 DECL_EXTERNAL (decl) = 1;
6506 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6507 DECL_EXTERNAL (old_decl) = 1;
6509 if (DECL_EXTERNAL (decl))
6511 DECL_INITIAL (decl) = NULL_TREE;
6512 DECL_COMMON (decl) = 0;
6513 DECL_ONE_ONLY (decl) = 0;
6514 DECL_WEAK (decl) = 0;
6516 else if (DECL_EXTERNAL (old_decl))
6518 DECL_INITIAL (old_decl) = NULL_TREE;
6519 DECL_COMMON (old_decl) = 0;
6520 DECL_ONE_ONLY (old_decl) = 0;
6521 DECL_WEAK (old_decl) = 0;
6526 error ("%Jredefinition of global '%D'", decl, decl);
6527 error ("%J'%D' previously defined here", old_decl, old_decl);
6534 /* Now insert the desired information from all the definitions
6535 into any plain declarations. */
6536 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6537 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6538 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6541 global_decl = htab_find (link_hash_table, decl);
6546 /* Print any appropriate error messages, and partially merge
6548 (void) duplicate_decls (decl, global_decl);
6551 htab_delete (link_hash_table);
6554 /* Perform final processing on file-scope data. */
6557 c_write_global_declarations(void)
6561 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6563 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6564 int len = list_length (globals);
6565 tree *vec = xmalloc (sizeof (tree) * len);
6569 /* Process the decls in the order they were written. */
6571 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6574 wrapup_global_declarations (vec, len);
6576 check_global_declarations (vec, len);
6583 /* Reset the parser's state in preparation for a new file. */
6586 c_reset_state (void)
6589 tree file_scope_decl;
6591 /* Pop the global scope. */
6592 if (current_scope != global_scope)
6593 current_scope = global_scope;
6594 file_scope_decl = current_file_decl;
6595 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6596 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6597 truly_local_externals = NULL_TREE;
6599 /* Start a new global binding level. */
6601 global_scope = current_scope;
6602 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6603 TREE_CHAIN (current_file_decl) = file_scope_decl;
6605 /* Reintroduce the builtin declarations. */
6606 for (link = first_builtin_decl;
6607 link != TREE_CHAIN (last_builtin_decl);
6608 link = TREE_CHAIN (link))
6609 pushdecl (copy_node (link));
6612 #include "gt-c-decl.h"