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. */
2064 return current_scope->names;
2068 /* Given NAME, an IDENTIFIER_NODE,
2069 return the structure (or union or enum) definition for that name.
2070 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2071 CODE says which kind of type the caller wants;
2072 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2073 If the wrong kind of type is found, an error is reported. */
2076 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2078 tree tag = IDENTIFIER_TAG_VALUE (name);
2084 /* We only care about whether it's in this level if
2085 thislevel_only was set or it might be a type clash. */
2086 if (thislevel_only || TREE_CODE (tag) != code)
2088 if (current_scope == global_scope
2089 || purpose_member (name, current_scope->tags))
2093 if (thislevel_only && !thislevel)
2096 if (TREE_CODE (tag) != code)
2098 /* Definition isn't the kind we were looking for. */
2099 pending_invalid_xref = name;
2100 pending_invalid_xref_location = input_location;
2102 /* If in the same binding level as a declaration as a tag
2103 of a different type, this must not be allowed to
2104 shadow that tag, so give the error immediately.
2105 (For example, "struct foo; union foo;" is invalid.) */
2107 pending_xref_error ();
2112 /* Print an error message now
2113 for a recent invalid struct, union or enum cross reference.
2114 We don't print them immediately because they are not invalid
2115 when used in the `struct foo;' construct for shadowing. */
2118 pending_xref_error (void)
2120 if (pending_invalid_xref != 0)
2121 error ("%H`%s' defined as wrong kind of tag",
2122 &pending_invalid_xref_location,
2123 IDENTIFIER_POINTER (pending_invalid_xref));
2124 pending_invalid_xref = 0;
2128 /* Look up NAME in the current scope and its superiors
2129 in the namespace of variables, functions and typedefs.
2130 Return a ..._DECL node of some kind representing its definition,
2131 or return 0 if it is undefined. */
2134 lookup_name (tree name)
2136 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2137 if (decl == 0 || decl == error_mark_node)
2139 if (C_DECL_INVISIBLE (decl))
2144 /* Similar to `lookup_name' but look only at the current scope. */
2147 lookup_name_current_level (tree name)
2149 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2151 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2154 if (current_scope == global_scope)
2157 /* Scan the current scope for a decl with name NAME.
2158 For PARM_DECLs, we have to look at both ->parms and ->names, since
2159 forward parameter declarations wind up on the ->names list. */
2160 if (TREE_CODE (decl) == PARM_DECL
2161 && chain_member (decl, current_scope->parms))
2163 if (chain_member (decl, current_scope->names))
2169 /* Create the predefined scalar types of C,
2170 and some nodes representing standard constants (0, 1, (void *) 0).
2171 Initialize the global scope.
2172 Make definitions for built-in primitive functions. */
2175 c_init_decl_processing (void)
2178 tree ptr_ftype_void, ptr_ftype_ptr;
2179 location_t save_loc = input_location;
2181 /* Adds some ggc roots, and reserved words for c-parse.in. */
2184 current_function_decl = 0;
2186 /* Make the c_scope structure for global names. */
2188 global_scope = current_scope;
2190 /* Declarations from c_common_nodes_and_builtins must not be associated
2191 with this input file, lest we get differences between using and not
2192 using preprocessed headers. */
2193 input_location.file = "<internal>";
2194 input_location.line = 0;
2196 /* Make the DECL for the toplevel file scope. */
2197 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2199 build_common_tree_nodes (flag_signed_char);
2201 c_common_nodes_and_builtins ();
2203 /* In C, comparisons and TRUTH_* expressions have type int. */
2204 truthvalue_type_node = integer_type_node;
2205 truthvalue_true_node = integer_one_node;
2206 truthvalue_false_node = integer_zero_node;
2208 /* Even in C99, which has a real boolean type. */
2209 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2210 boolean_type_node));
2212 endlink = void_list_node;
2213 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2215 = build_function_type (ptr_type_node,
2216 tree_cons (NULL_TREE, ptr_type_node, endlink));
2218 input_location = save_loc;
2220 pedantic_lvalues = true;
2222 make_fname_decl = c_make_fname_decl;
2223 start_fname_decls ();
2225 first_builtin_decl = global_scope->names;
2226 last_builtin_decl = global_scope->names_last;
2229 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2230 decl, NAME is the initialization string and TYPE_DEP indicates whether
2231 NAME depended on the type of the function. As we don't yet implement
2232 delayed emission of static data, we mark the decl as emitted
2233 so it is not placed in the output. Anything using it must therefore pull
2234 out the STRING_CST initializer directly. FIXME. */
2237 c_make_fname_decl (tree id, int type_dep)
2239 const char *name = fname_as_string (type_dep);
2240 tree decl, type, init;
2241 size_t length = strlen (name);
2243 type = build_array_type
2244 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2245 build_index_type (size_int (length)));
2247 decl = build_decl (VAR_DECL, id, type);
2249 TREE_STATIC (decl) = 1;
2250 TREE_READONLY (decl) = 1;
2251 DECL_ARTIFICIAL (decl) = 1;
2253 init = build_string (length + 1, name);
2254 TREE_TYPE (init) = type;
2255 DECL_INITIAL (decl) = init;
2257 TREE_USED (decl) = 1;
2259 if (current_function_decl)
2261 DECL_CONTEXT (decl) = current_function_decl;
2262 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2263 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2266 finish_decl (decl, init, NULL_TREE);
2271 /* Return a definition for a builtin function named NAME and whose data type
2272 is TYPE. TYPE should be a function type with argument types.
2273 FUNCTION_CODE tells later passes how to compile calls to this function.
2274 See tree.h for its possible values.
2276 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2277 the name to be called if we can't opencode the function. If
2278 ATTRS is nonzero, use that for the function's attribute list. */
2281 builtin_function (const char *name, tree type, int function_code,
2282 enum built_in_class class, const char *library_name,
2285 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2286 DECL_EXTERNAL (decl) = 1;
2287 TREE_PUBLIC (decl) = 1;
2289 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2290 make_decl_rtl (decl, NULL);
2292 DECL_BUILT_IN_CLASS (decl) = class;
2293 DECL_FUNCTION_CODE (decl) = function_code;
2295 /* Warn if a function in the namespace for users
2296 is used without an occasion to consider it declared. */
2297 if (name[0] != '_' || name[1] != '_')
2298 C_DECL_INVISIBLE (decl) = 1;
2300 /* Possibly apply some default attributes to this built-in function. */
2302 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2304 decl_attributes (&decl, NULL_TREE, 0);
2309 /* Called when a declaration is seen that contains no names to declare.
2310 If its type is a reference to a structure, union or enum inherited
2311 from a containing scope, shadow that tag name for the current scope
2312 with a forward reference.
2313 If its type defines a new named structure or union
2314 or defines an enum, it is valid but we need not do anything here.
2315 Otherwise, it is an error. */
2318 shadow_tag (tree declspecs)
2320 shadow_tag_warned (declspecs, 0);
2324 shadow_tag_warned (tree declspecs, int warned)
2327 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2334 pending_invalid_xref = 0;
2336 /* Remove the attributes from declspecs, since they will confuse the
2338 split_specs_attrs (declspecs, &specs, &attrs);
2340 for (link = specs; link; link = TREE_CHAIN (link))
2342 tree value = TREE_VALUE (link);
2343 enum tree_code code = TREE_CODE (value);
2345 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2346 /* Used to test also that TYPE_SIZE (value) != 0.
2347 That caused warning for `struct foo;' at top level in the file. */
2349 tree name = TYPE_NAME (value);
2356 if (warned != 1 && code != ENUMERAL_TYPE)
2357 /* Empty unnamed enum OK */
2359 pedwarn ("unnamed struct/union that defines no instances");
2365 t = lookup_tag (code, name, 1);
2369 t = make_node (code);
2376 if (!warned && ! in_system_header)
2378 warning ("useless keyword or type name in empty declaration");
2385 error ("two types specified in one empty declaration");
2390 pedwarn ("empty declaration");
2394 /* Construct an array declarator. EXPR is the expression inside [], or
2395 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2396 to the pointer to which a parameter array is converted). STATIC_P is
2397 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2398 is nonzero is the array is [*], a VLA of unspecified length which is
2399 nevertheless a complete type (not currently implemented by GCC),
2400 zero otherwise. The declarator is constructed as an ARRAY_REF
2401 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2402 left of the [] (filled by in set_array_declarator_type) and operand 1
2403 is the expression inside; whose TREE_TYPE is the type qualifiers and
2404 which has TREE_STATIC set if "static" is used. */
2407 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2410 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2411 TREE_TYPE (decl) = quals;
2412 TREE_STATIC (decl) = (static_p ? 1 : 0);
2413 if (pedantic && !flag_isoc99)
2415 if (static_p || quals != NULL_TREE)
2416 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2418 pedwarn ("ISO C90 does not support `[*]' array declarators");
2421 warning ("GCC does not yet properly implement `[*]' array declarators");
2425 /* Set the type of an array declarator. DECL is the declarator, as
2426 constructed by build_array_declarator; TYPE is what appears on the left
2427 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2428 abstract declarator, zero otherwise; this is used to reject static and
2429 type qualifiers in abstract declarators, where they are not in the
2433 set_array_declarator_type (tree decl, tree type, int abstract_p)
2435 TREE_OPERAND (decl, 0) = type;
2436 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2437 error ("static or type qualifiers in abstract declarator");
2441 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2444 groktypename (tree typename)
2448 if (TREE_CODE (typename) != TREE_LIST)
2451 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2453 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2456 /* Apply attributes. */
2457 decl_attributes (&typename, attrs, 0);
2462 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2465 groktypename_in_parm_context (tree typename)
2467 if (TREE_CODE (typename) != TREE_LIST)
2469 return grokdeclarator (TREE_VALUE (typename),
2470 TREE_PURPOSE (typename),
2474 /* Decode a declarator in an ordinary declaration or data definition.
2475 This is called as soon as the type information and variable name
2476 have been parsed, before parsing the initializer if any.
2477 Here we create the ..._DECL node, fill in its type,
2478 and put it on the list of decls for the current context.
2479 The ..._DECL node is returned as the value.
2481 Exception: for arrays where the length is not specified,
2482 the type is left null, to be filled in by `finish_decl'.
2484 Function definitions do not come here; they go to start_function
2485 instead. However, external and forward declarations of functions
2486 do go through here. Structure field declarations are done by
2487 grokfield and not through here. */
2490 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2495 /* An object declared as __attribute__((deprecated)) suppresses
2496 warnings of uses of other deprecated items. */
2497 if (lookup_attribute ("deprecated", attributes))
2498 deprecated_state = DEPRECATED_SUPPRESS;
2500 decl = grokdeclarator (declarator, declspecs,
2501 NORMAL, initialized, NULL);
2503 deprecated_state = DEPRECATED_NORMAL;
2505 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2506 && MAIN_NAME_P (DECL_NAME (decl)))
2507 warning ("%J'%D' is usually a function", decl, decl);
2510 /* Is it valid for this decl to have an initializer at all?
2511 If not, set INITIALIZED to zero, which will indirectly
2512 tell `finish_decl' to ignore the initializer once it is parsed. */
2513 switch (TREE_CODE (decl))
2516 error ("typedef `%s' is initialized (use __typeof__ instead)",
2517 IDENTIFIER_POINTER (DECL_NAME (decl)));
2522 error ("function `%s' is initialized like a variable",
2523 IDENTIFIER_POINTER (DECL_NAME (decl)));
2528 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2529 error ("parameter `%s' is initialized",
2530 IDENTIFIER_POINTER (DECL_NAME (decl)));
2535 /* Don't allow initializations for incomplete types
2536 except for arrays which might be completed by the initialization. */
2538 /* This can happen if the array size is an undefined macro. We already
2539 gave a warning, so we don't need another one. */
2540 if (TREE_TYPE (decl) == error_mark_node)
2542 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2544 /* A complete type is ok if size is fixed. */
2546 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2547 || C_DECL_VARIABLE_SIZE (decl))
2549 error ("variable-sized object may not be initialized");
2553 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2555 error ("variable `%s' has initializer but incomplete type",
2556 IDENTIFIER_POINTER (DECL_NAME (decl)));
2559 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2561 error ("elements of array `%s' have incomplete type",
2562 IDENTIFIER_POINTER (DECL_NAME (decl)));
2569 DECL_EXTERNAL (decl) = 0;
2570 if (current_scope == global_scope)
2571 TREE_STATIC (decl) = 1;
2573 /* Tell `pushdecl' this is an initialized decl
2574 even though we don't yet have the initializer expression.
2575 Also tell `finish_decl' it may store the real initializer. */
2576 DECL_INITIAL (decl) = error_mark_node;
2579 /* If this is a function declaration, write a record describing it to the
2580 prototypes file (if requested). */
2582 if (TREE_CODE (decl) == FUNCTION_DECL)
2583 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2585 /* ANSI specifies that a tentative definition which is not merged with
2586 a non-tentative definition behaves exactly like a definition with an
2587 initializer equal to zero. (Section 3.7.2)
2589 -fno-common gives strict ANSI behavior, though this tends to break
2590 a large body of code that grew up without this rule.
2592 Thread-local variables are never common, since there's no entrenched
2593 body of code to break, and it allows more efficient variable references
2594 in the presence of dynamic linking. */
2596 if (TREE_CODE (decl) == VAR_DECL
2598 && TREE_PUBLIC (decl)
2599 && !DECL_THREAD_LOCAL (decl)
2601 DECL_COMMON (decl) = 1;
2603 /* Set attributes here so if duplicate decl, will have proper attributes. */
2604 decl_attributes (&decl, attributes, 0);
2606 if (TREE_CODE (decl) == FUNCTION_DECL
2607 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2609 tree ce = declarator;
2611 if (TREE_CODE (ce) == INDIRECT_REF)
2612 ce = TREE_OPERAND (declarator, 0);
2613 if (TREE_CODE (ce) == CALL_EXPR)
2615 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2616 for (; args; args = TREE_CHAIN (args))
2618 tree type = TREE_TYPE (args);
2619 if (INTEGRAL_TYPE_P (type)
2620 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2621 DECL_ARG_TYPE (args) = integer_type_node;
2626 if (TREE_CODE (decl) == FUNCTION_DECL
2627 && DECL_DECLARED_INLINE_P (decl)
2628 && DECL_UNINLINABLE (decl)
2629 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2630 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2632 /* Add this decl to the current scope.
2633 TEM may equal DECL or it may be a previous decl of the same name. */
2634 tem = pushdecl (decl);
2636 /* For a local variable, define the RTL now. */
2637 if (current_scope != global_scope
2638 /* But not if this is a duplicate decl
2639 and we preserved the rtl from the previous one
2640 (which may or may not happen). */
2641 && !DECL_RTL_SET_P (tem)
2642 && DECL_FILE_SCOPE_P (tem))
2644 if (TREE_TYPE (tem) != error_mark_node
2645 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2646 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2647 && DECL_INITIAL (tem) != 0)))
2654 /* Finish processing of a declaration;
2655 install its initial value.
2656 If the length of an array type is not known before,
2657 it must be determined now, from the initial value, or it is an error. */
2660 finish_decl (tree decl, tree init, tree asmspec_tree)
2662 tree type = TREE_TYPE (decl);
2663 int was_incomplete = (DECL_SIZE (decl) == 0);
2664 const char *asmspec = 0;
2666 /* If a name was specified, get the string. */
2667 if (current_scope == global_scope)
2668 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2670 asmspec = TREE_STRING_POINTER (asmspec_tree);
2672 /* If `start_decl' didn't like having an initialization, ignore it now. */
2673 if (init != 0 && DECL_INITIAL (decl) == 0)
2676 /* Don't crash if parm is initialized. */
2677 if (TREE_CODE (decl) == PARM_DECL)
2681 store_init_value (decl, init);
2683 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2684 || TREE_CODE (decl) == FUNCTION_DECL
2685 || TREE_CODE (decl) == FIELD_DECL))
2686 objc_check_decl (decl);
2688 /* Deduce size of array from initialization, if not already known. */
2689 if (TREE_CODE (type) == ARRAY_TYPE
2690 && TYPE_DOMAIN (type) == 0
2691 && TREE_CODE (decl) != TYPE_DECL)
2694 = (TREE_STATIC (decl)
2695 /* Even if pedantic, an external linkage array
2696 may have incomplete type at first. */
2697 ? pedantic && !TREE_PUBLIC (decl)
2698 : !DECL_EXTERNAL (decl));
2700 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2702 /* Get the completed type made by complete_array_type. */
2703 type = TREE_TYPE (decl);
2706 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2708 else if (failure == 2)
2711 error ("%Jarray size missing in '%D'", decl, decl);
2712 /* If a `static' var's size isn't known,
2713 make it extern as well as static, so it does not get
2715 If it is not `static', then do not mark extern;
2716 finish_incomplete_decl will give it a default size
2717 and it will get allocated. */
2718 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2719 DECL_EXTERNAL (decl) = 1;
2722 /* TYPE_MAX_VALUE is always one less than the number of elements
2723 in the array, because we start counting at zero. Therefore,
2724 warn only if the value is less than zero. */
2725 else if (pedantic && TYPE_DOMAIN (type) != 0
2726 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2727 error ("%Jzero or negative size array '%D'", decl, decl);
2729 layout_decl (decl, 0);
2732 if (TREE_CODE (decl) == VAR_DECL)
2734 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2735 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2736 layout_decl (decl, 0);
2738 if (DECL_SIZE (decl) == 0
2739 /* Don't give an error if we already gave one earlier. */
2740 && TREE_TYPE (decl) != error_mark_node
2741 && (TREE_STATIC (decl)
2743 /* A static variable with an incomplete type
2744 is an error if it is initialized.
2745 Also if it is not file scope.
2746 Otherwise, let it through, but if it is not `extern'
2747 then it may cause an error message later. */
2748 (DECL_INITIAL (decl) != 0
2749 || !DECL_FILE_SCOPE_P (decl))
2751 /* An automatic variable with an incomplete type
2753 !DECL_EXTERNAL (decl)))
2755 error ("%Jstorage size of '%D' isn't known", decl, decl);
2756 TREE_TYPE (decl) = error_mark_node;
2759 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2760 && DECL_SIZE (decl) != 0)
2762 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2763 constant_expression_warning (DECL_SIZE (decl));
2765 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2768 if (TREE_USED (type))
2769 TREE_USED (decl) = 1;
2772 /* If this is a function and an assembler name is specified, reset DECL_RTL
2773 so we can give it its new name. Also, update built_in_decls if it
2774 was a normal built-in. */
2775 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2777 /* ASMSPEC is given, and not the name of a register. Mark the
2778 name with a star so assemble_name won't munge it. */
2779 char *starred = alloca (strlen (asmspec) + 2);
2781 strcpy (starred + 1, asmspec);
2783 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2785 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2786 SET_DECL_RTL (builtin, NULL_RTX);
2787 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2788 #ifdef TARGET_MEM_FUNCTIONS
2789 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2790 init_block_move_fn (starred);
2791 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2792 init_block_clear_fn (starred);
2794 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2795 init_block_move_fn (starred);
2796 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2797 init_block_clear_fn (starred);
2800 SET_DECL_RTL (decl, NULL_RTX);
2801 change_decl_assembler_name (decl, get_identifier (starred));
2804 /* If #pragma weak was used, mark the decl weak now. */
2805 if (current_scope == global_scope)
2806 maybe_apply_pragma_weak (decl);
2808 /* Output the assembler code and/or RTL code for variables and functions,
2809 unless the type is an undefined structure or union.
2810 If not, it will get done when the type is completed. */
2812 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2814 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2815 if (c_dialect_objc ())
2816 objc_check_decl (decl);
2818 if (DECL_FILE_SCOPE_P (decl))
2820 if (DECL_INITIAL (decl) == NULL_TREE
2821 || DECL_INITIAL (decl) == error_mark_node)
2822 /* Don't output anything
2823 when a tentative file-scope definition is seen.
2824 But at end of compilation, do output code for them. */
2825 DECL_DEFER_OUTPUT (decl) = 1;
2826 rest_of_decl_compilation (decl, asmspec, true, 0);
2830 /* This is a local variable. If there is an ASMSPEC, the
2831 user has requested that we handle it specially. */
2834 /* In conjunction with an ASMSPEC, the `register'
2835 keyword indicates that we should place the variable
2836 in a particular register. */
2837 if (DECL_REGISTER (decl))
2838 DECL_C_HARD_REGISTER (decl) = 1;
2840 /* If this is not a static variable, issue a warning.
2841 It doesn't make any sense to give an ASMSPEC for an
2842 ordinary, non-register local variable. Historically,
2843 GCC has accepted -- but ignored -- the ASMSPEC in
2845 if (TREE_CODE (decl) == VAR_DECL
2846 && !DECL_REGISTER (decl)
2847 && !TREE_STATIC (decl))
2848 warning ("%Jignoring asm-specifier for non-static local "
2849 "variable '%D'", decl, decl);
2851 change_decl_assembler_name (decl, get_identifier (asmspec));
2854 if (TREE_CODE (decl) != FUNCTION_DECL)
2855 add_decl_stmt (decl);
2858 if (!DECL_FILE_SCOPE_P (decl))
2860 /* Recompute the RTL of a local array now
2861 if it used to be an incomplete type. */
2863 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2865 /* If we used it already as memory, it must stay in memory. */
2866 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2867 /* If it's still incomplete now, no init will save it. */
2868 if (DECL_SIZE (decl) == 0)
2869 DECL_INITIAL (decl) = 0;
2874 /* If this was marked 'used', be sure it will be output. */
2875 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2876 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2878 if (TREE_CODE (decl) == TYPE_DECL)
2879 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2881 /* At the end of a declaration, throw away any variable type sizes
2882 of types defined inside that declaration. There is no use
2883 computing them in the following function definition. */
2884 if (current_scope == global_scope)
2885 get_pending_sizes ();
2887 /* Install a cleanup (aka destructor) if one was given. */
2888 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2890 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2893 static bool eh_initialized_p;
2895 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2896 tree cleanup_decl = lookup_name (cleanup_id);
2899 /* Build "cleanup(&decl)" for the destructor. */
2900 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2901 cleanup = build_tree_list (NULL_TREE, cleanup);
2902 cleanup = build_function_call (cleanup_decl, cleanup);
2904 /* Don't warn about decl unused; the cleanup uses it. */
2905 TREE_USED (decl) = 1;
2907 /* Initialize EH, if we've been told to do so. */
2908 if (flag_exceptions && !eh_initialized_p)
2910 eh_initialized_p = true;
2911 eh_personality_libfunc
2912 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2913 ? "__gcc_personality_sj0"
2914 : "__gcc_personality_v0");
2915 using_eh_for_cleanups ();
2918 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2923 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2924 and push that on the current scope. */
2927 push_parm_decl (tree parm)
2931 /* Don't attempt to expand sizes while parsing this decl.
2932 (We can get here with i_s_e 1 somehow from Objective-C.) */
2933 int save_immediate_size_expand = immediate_size_expand;
2934 immediate_size_expand = 0;
2936 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2937 TREE_PURPOSE (TREE_PURPOSE (parm)),
2939 decl_attributes (&decl, TREE_VALUE (parm), 0);
2941 decl = pushdecl (decl);
2943 finish_decl (decl, NULL_TREE, NULL_TREE);
2945 immediate_size_expand = save_immediate_size_expand;
2948 /* Mark all the parameter declarations to date as forward decls,
2949 shift them to the variables list, and reset the parameters list.
2950 Also diagnose use of this extension. */
2953 mark_forward_parm_decls (void)
2957 if (pedantic && !current_scope->warned_forward_parm_decls)
2959 pedwarn ("ISO C forbids forward parameter declarations");
2960 current_scope->warned_forward_parm_decls = true;
2963 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2964 TREE_ASM_WRITTEN (parm) = 1;
2966 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
2967 current_scope->parms = 0;
2968 current_scope->parms_last = 0;
2971 static GTY(()) int compound_literal_number;
2973 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2974 literal, which may be an incomplete array type completed by the
2975 initializer; INIT is a CONSTRUCTOR that initializes the compound
2979 build_compound_literal (tree type, tree init)
2981 /* We do not use start_decl here because we have a type, not a declarator;
2982 and do not use finish_decl because the decl should be stored inside
2983 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
2984 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
2987 DECL_EXTERNAL (decl) = 0;
2988 TREE_PUBLIC (decl) = 0;
2989 TREE_STATIC (decl) = (current_scope == global_scope);
2990 DECL_CONTEXT (decl) = current_function_decl;
2991 TREE_USED (decl) = 1;
2992 TREE_TYPE (decl) = type;
2993 TREE_READONLY (decl) = TREE_READONLY (type);
2994 store_init_value (decl, init);
2996 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
2998 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3003 type = TREE_TYPE (decl);
3004 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3005 return error_mark_node;
3007 stmt = build_stmt (DECL_STMT, decl);
3008 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3009 TREE_SIDE_EFFECTS (complit) = 1;
3011 layout_decl (decl, 0);
3013 if (TREE_STATIC (decl))
3015 /* This decl needs a name for the assembler output. We also need
3016 a unique suffix to be added to the name. */
3019 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3020 compound_literal_number);
3021 compound_literal_number++;
3022 DECL_NAME (decl) = get_identifier (name);
3023 DECL_DEFER_OUTPUT (decl) = 1;
3024 DECL_COMDAT (decl) = 1;
3025 DECL_ARTIFICIAL (decl) = 1;
3027 rest_of_decl_compilation (decl, NULL, 1, 0);
3033 /* Make TYPE a complete type based on INITIAL_VALUE.
3034 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3035 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3038 complete_array_type (tree type, tree initial_value, int do_default)
3040 tree maxindex = NULL_TREE;
3045 /* Note MAXINDEX is really the maximum index,
3046 one less than the size. */
3047 if (TREE_CODE (initial_value) == STRING_CST)
3050 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3051 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3054 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3056 tree elts = CONSTRUCTOR_ELTS (initial_value);
3057 maxindex = build_int_2 (-1, -1);
3058 for (; elts; elts = TREE_CHAIN (elts))
3060 if (TREE_PURPOSE (elts))
3061 maxindex = TREE_PURPOSE (elts);
3063 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3064 maxindex, integer_one_node));
3066 maxindex = copy_node (maxindex);
3070 /* Make an error message unless that happened already. */
3071 if (initial_value != error_mark_node)
3074 /* Prevent further error messages. */
3075 maxindex = build_int_2 (0, 0);
3082 maxindex = build_int_2 (0, 0);
3088 TYPE_DOMAIN (type) = build_index_type (maxindex);
3089 if (!TREE_TYPE (maxindex))
3090 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3093 /* Lay out the type now that we can get the real answer. */
3100 /* Determine whether TYPE is a structure with a flexible array member,
3101 or a union containing such a structure (possibly recursively). */
3104 flexible_array_type_p (tree type)
3107 switch (TREE_CODE (type))
3110 x = TYPE_FIELDS (type);
3113 while (TREE_CHAIN (x) != NULL_TREE)
3115 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3116 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3117 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3118 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3122 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3124 if (flexible_array_type_p (TREE_TYPE (x)))
3133 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3134 replacing with appropriate values if they are invalid. */
3136 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3139 unsigned int max_width;
3140 unsigned HOST_WIDE_INT w;
3141 const char *name = orig_name ? orig_name: _("<anonymous>");
3144 STRIP_NOPS (*width);
3146 /* Detect and ignore out of range field width and process valid
3148 if (TREE_CODE (*width) != INTEGER_CST)
3150 error ("bit-field `%s' width not an integer constant", name);
3151 *width = integer_one_node;
3155 constant_expression_warning (*width);
3156 if (tree_int_cst_sgn (*width) < 0)
3158 error ("negative width in bit-field `%s'", name);
3159 *width = integer_one_node;
3161 else if (integer_zerop (*width) && orig_name)
3163 error ("zero width for bit-field `%s'", name);
3164 *width = integer_one_node;
3168 /* Detect invalid bit-field type. */
3169 if (TREE_CODE (*type) != INTEGER_TYPE
3170 && TREE_CODE (*type) != BOOLEAN_TYPE
3171 && TREE_CODE (*type) != ENUMERAL_TYPE)
3173 error ("bit-field `%s' has invalid type", name);
3174 *type = unsigned_type_node;
3177 type_mv = TYPE_MAIN_VARIANT (*type);
3179 && type_mv != integer_type_node
3180 && type_mv != unsigned_type_node
3181 && type_mv != boolean_type_node)
3182 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3184 if (type_mv == boolean_type_node)
3185 max_width = CHAR_TYPE_SIZE;
3187 max_width = TYPE_PRECISION (*type);
3189 if (0 < compare_tree_int (*width, max_width))
3191 error ("width of `%s' exceeds its type", name);
3193 *width = build_int_2 (w, 0);
3196 w = tree_low_cst (*width, 1);
3198 if (TREE_CODE (*type) == ENUMERAL_TYPE
3199 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3200 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3201 warning ("`%s' is narrower than values of its type", name);
3204 /* Given declspecs and a declarator,
3205 determine the name and type of the object declared
3206 and construct a ..._DECL node for it.
3207 (In one case we can return a ..._TYPE node instead.
3208 For invalid input we sometimes return 0.)
3210 DECLSPECS is a chain of tree_list nodes whose value fields
3211 are the storage classes and type specifiers.
3213 DECL_CONTEXT says which syntactic context this declaration is in:
3214 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3215 FUNCDEF for a function definition. Like NORMAL but a few different
3216 error messages in each case. Return value may be zero meaning
3217 this definition is too screwy to try to parse.
3218 PARM for a parameter declaration (either within a function prototype
3219 or before a function body). Make a PARM_DECL, or return void_type_node.
3220 TYPENAME if for a typename (in a cast or sizeof).
3221 Don't make a DECL node; just return the ..._TYPE node.
3222 FIELD for a struct or union field; make a FIELD_DECL.
3223 INITIALIZED is 1 if the decl has an initializer.
3224 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3225 representing the width of the bit-field.
3227 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3228 It may also be so in the PARM case, for a prototype where the
3229 argument type is specified but not the name.
3231 This function is where the complicated C meanings of `static'
3232 and `extern' are interpreted. */
3235 grokdeclarator (tree declarator, tree declspecs,
3236 enum decl_context decl_context, int initialized, tree *width)
3240 tree type = NULL_TREE;
3245 int type_quals = TYPE_UNQUALIFIED;
3247 int explicit_int = 0;
3248 int explicit_char = 0;
3249 int defaulted_int = 0;
3250 tree typedef_decl = 0;
3251 const char *name, *orig_name;
3252 tree typedef_type = 0;
3253 int funcdef_flag = 0;
3254 enum tree_code innermost_code = ERROR_MARK;
3255 int size_varies = 0;
3256 tree decl_attr = NULL_TREE;
3257 tree array_ptr_quals = NULL_TREE;
3258 int array_parm_static = 0;
3259 tree returned_attrs = NULL_TREE;
3260 bool bitfield = width != NULL;
3263 if (decl_context == FUNCDEF)
3264 funcdef_flag = 1, decl_context = NORMAL;
3266 /* Look inside a declarator for the name being declared
3267 and get it as a string, for an error message. */
3269 tree decl = declarator;
3273 switch (TREE_CODE (decl))
3278 innermost_code = TREE_CODE (decl);
3279 decl = TREE_OPERAND (decl, 0);
3283 decl = TREE_VALUE (decl);
3286 case IDENTIFIER_NODE:
3287 name = IDENTIFIER_POINTER (decl);
3299 /* A function definition's declarator must have the form of
3300 a function declarator. */
3302 if (funcdef_flag && innermost_code != CALL_EXPR)
3305 /* If this looks like a function definition, make it one,
3306 even if it occurs where parms are expected.
3307 Then store_parm_decls will reject it and not use it as a parm. */
3308 if (decl_context == NORMAL && !funcdef_flag
3309 && current_scope->parm_flag)
3310 decl_context = PARM;
3312 /* Look through the decl specs and record which ones appear.
3313 Some typespecs are defined as built-in typenames.
3314 Others, the ones that are modifiers of other types,
3315 are represented by bits in SPECBITS: set the bits for
3316 the modifiers that appear. Storage class keywords are also in SPECBITS.
3318 If there is a typedef name or a type, store the type in TYPE.
3319 This includes builtin typedefs such as `int'.
3321 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3322 and did not come from a user typedef.
3324 Set LONGLONG if `long' is mentioned twice. */
3326 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3328 tree id = TREE_VALUE (spec);
3330 /* If the entire declaration is itself tagged as deprecated then
3331 suppress reports of deprecated items. */
3332 if (id && TREE_DEPRECATED (id))
3334 if (deprecated_state != DEPRECATED_SUPPRESS)
3335 warn_deprecated_use (id);
3338 if (id == ridpointers[(int) RID_INT])
3340 if (id == ridpointers[(int) RID_CHAR])
3343 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3345 enum rid i = C_RID_CODE (id);
3346 if ((int) i <= (int) RID_LAST_MODIFIER)
3348 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3351 error ("`long long long' is too long for GCC");
3354 if (pedantic && !flag_isoc99 && ! in_system_header
3356 pedwarn ("ISO C90 does not support `long long'");
3360 else if (specbits & (1 << (int) i))
3362 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3365 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3368 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3371 /* Diagnose "__thread extern". Recall that this list
3372 is in the reverse order seen in the text. */
3374 && (specbits & (1 << (int) RID_EXTERN
3375 | 1 << (int) RID_STATIC)))
3377 if (specbits & 1 << (int) RID_EXTERN)
3378 error ("`__thread' before `extern'");
3380 error ("`__thread' before `static'");
3383 specbits |= 1 << (int) i;
3388 error ("two or more data types in declaration of `%s'", name);
3389 /* Actual typedefs come to us as TYPE_DECL nodes. */
3390 else if (TREE_CODE (id) == TYPE_DECL)
3392 if (TREE_TYPE (id) == error_mark_node)
3393 ; /* Allow the type to default to int to avoid cascading errors. */
3396 type = TREE_TYPE (id);
3397 decl_attr = DECL_ATTRIBUTES (id);
3401 /* Built-in types come as identifiers. */
3402 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3404 tree t = lookup_name (id);
3405 if (TREE_TYPE (t) == error_mark_node)
3407 else if (!t || TREE_CODE (t) != TYPE_DECL)
3408 error ("`%s' fails to be a typedef or built in type",
3409 IDENTIFIER_POINTER (id));
3412 type = TREE_TYPE (t);
3416 else if (TREE_CODE (id) != ERROR_MARK)
3423 typedef_type = type;
3425 size_varies = C_TYPE_VARIABLE_SIZE (type);
3427 /* No type at all: default to `int', and set DEFAULTED_INT
3428 because it was not a user-defined typedef. */
3432 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3433 | (1 << (int) RID_SIGNED)
3434 | (1 << (int) RID_UNSIGNED)
3435 | (1 << (int) RID_COMPLEX))))
3436 /* Don't warn about typedef foo = bar. */
3437 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3438 && ! in_system_header)
3440 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3441 and this is a function, or if -Wimplicit; prefer the former
3442 warning since it is more explicit. */
3443 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3445 warn_about_return_type = 1;
3446 else if (warn_implicit_int || flag_isoc99)
3447 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3452 type = integer_type_node;
3455 /* Now process the modifiers that were specified
3456 and check for invalid combinations. */
3458 /* Long double is a special combination. */
3460 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3461 && TYPE_MAIN_VARIANT (type) == double_type_node)
3463 specbits &= ~(1 << (int) RID_LONG);
3464 type = long_double_type_node;
3467 /* Check all other uses of type modifiers. */
3469 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3470 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3474 if ((specbits & 1 << (int) RID_LONG)
3475 && (specbits & 1 << (int) RID_SHORT))
3476 error ("both long and short specified for `%s'", name);
3477 else if (((specbits & 1 << (int) RID_LONG)
3478 || (specbits & 1 << (int) RID_SHORT))
3480 error ("long or short specified with char for `%s'", name);
3481 else if (((specbits & 1 << (int) RID_LONG)
3482 || (specbits & 1 << (int) RID_SHORT))
3483 && TREE_CODE (type) == REAL_TYPE)
3485 static int already = 0;
3487 error ("long or short specified with floating type for `%s'", name);
3488 if (! already && ! pedantic)
3490 error ("the only valid combination is `long double'");
3494 else if ((specbits & 1 << (int) RID_SIGNED)
3495 && (specbits & 1 << (int) RID_UNSIGNED))
3496 error ("both signed and unsigned specified for `%s'", name);
3497 else if (TREE_CODE (type) != INTEGER_TYPE)
3498 error ("long, short, signed or unsigned invalid for `%s'", name);
3502 if (!explicit_int && !defaulted_int && !explicit_char)
3504 error ("long, short, signed or unsigned used invalidly for `%s'",
3510 /* Discard the type modifiers if they are invalid. */
3513 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3514 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3519 if ((specbits & (1 << (int) RID_COMPLEX))
3520 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3522 error ("complex invalid for `%s'", name);
3523 specbits &= ~(1 << (int) RID_COMPLEX);
3526 /* Decide whether an integer type is signed or not.
3527 Optionally treat bit-fields as signed by default. */
3528 if (specbits & 1 << (int) RID_UNSIGNED
3529 || (bitfield && ! flag_signed_bitfields
3530 && (explicit_int || defaulted_int || explicit_char
3531 /* A typedef for plain `int' without `signed'
3532 can be controlled just like plain `int'. */
3533 || ! (typedef_decl != 0
3534 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3535 && TREE_CODE (type) != ENUMERAL_TYPE
3536 && !(specbits & 1 << (int) RID_SIGNED)))
3539 type = long_long_unsigned_type_node;
3540 else if (specbits & 1 << (int) RID_LONG)
3541 type = long_unsigned_type_node;
3542 else if (specbits & 1 << (int) RID_SHORT)
3543 type = short_unsigned_type_node;
3544 else if (type == char_type_node)
3545 type = unsigned_char_type_node;
3546 else if (typedef_decl)
3547 type = c_common_unsigned_type (type);
3549 type = unsigned_type_node;
3551 else if ((specbits & 1 << (int) RID_SIGNED)
3552 && type == char_type_node)
3553 type = signed_char_type_node;
3555 type = long_long_integer_type_node;
3556 else if (specbits & 1 << (int) RID_LONG)
3557 type = long_integer_type_node;
3558 else if (specbits & 1 << (int) RID_SHORT)
3559 type = short_integer_type_node;
3561 if (specbits & 1 << (int) RID_COMPLEX)
3563 if (pedantic && !flag_isoc99)
3564 pedwarn ("ISO C90 does not support complex types");
3565 /* If we just have "complex", it is equivalent to
3566 "complex double", but if any modifiers at all are specified it is
3567 the complex form of TYPE. E.g, "complex short" is
3568 "complex short int". */
3570 if (defaulted_int && ! longlong
3571 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3572 | (1 << (int) RID_SIGNED)
3573 | (1 << (int) RID_UNSIGNED))))
3576 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3577 type = complex_double_type_node;
3579 else if (type == integer_type_node)
3582 pedwarn ("ISO C does not support complex integer types");
3583 type = complex_integer_type_node;
3585 else if (type == float_type_node)
3586 type = complex_float_type_node;
3587 else if (type == double_type_node)
3588 type = complex_double_type_node;
3589 else if (type == long_double_type_node)
3590 type = complex_long_double_type_node;
3594 pedwarn ("ISO C does not support complex integer types");
3595 type = build_complex_type (type);
3599 /* Check the type and width of a bit-field. */
3601 check_bitfield_type_and_width (&type, width, orig_name);
3603 /* Figure out the type qualifiers for the declaration. There are
3604 two ways a declaration can become qualified. One is something
3605 like `const int i' where the `const' is explicit. Another is
3606 something like `typedef const int CI; CI i' where the type of the
3607 declaration contains the `const'. A third possibility is that
3608 there is a type qualifier on the element type of a typedefed
3609 array type, in which case we should extract that qualifier so
3610 that c_apply_type_quals_to_decls receives the full list of
3611 qualifiers to work with (C90 is not entirely clear about whether
3612 duplicate qualifiers should be diagnosed in this case, but it
3613 seems most appropriate to do so). */
3614 element_type = strip_array_types (type);
3615 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3617 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3619 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3620 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3621 if (constp > 1 && ! flag_isoc99)
3622 pedwarn ("duplicate `const'");
3623 if (restrictp > 1 && ! flag_isoc99)
3624 pedwarn ("duplicate `restrict'");
3625 if (volatilep > 1 && ! flag_isoc99)
3626 pedwarn ("duplicate `volatile'");
3627 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3628 type = TYPE_MAIN_VARIANT (type);
3629 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3630 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3631 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3633 /* Warn if two storage classes are given. Default to `auto'. */
3638 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3639 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3640 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3641 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3642 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3644 /* "static __thread" and "extern __thread" are allowed. */
3645 if ((specbits & (1 << (int) RID_THREAD
3646 | 1 << (int) RID_STATIC
3647 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3650 /* Warn about storage classes that are invalid for certain
3651 kinds of declarations (parameters, typenames, etc.). */
3654 error ("multiple storage classes in declaration of `%s'", name);
3655 else if (funcdef_flag
3657 & ((1 << (int) RID_REGISTER)
3658 | (1 << (int) RID_AUTO)
3659 | (1 << (int) RID_TYPEDEF)
3660 | (1 << (int) RID_THREAD))))
3662 if (specbits & 1 << (int) RID_AUTO
3663 && (pedantic || current_scope == global_scope))
3664 pedwarn ("function definition declared `auto'");
3665 if (specbits & 1 << (int) RID_REGISTER)
3666 error ("function definition declared `register'");
3667 if (specbits & 1 << (int) RID_TYPEDEF)
3668 error ("function definition declared `typedef'");
3669 if (specbits & 1 << (int) RID_THREAD)
3670 error ("function definition declared `__thread'");
3671 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3672 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3674 else if (decl_context != NORMAL && nclasses > 0)
3676 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3680 switch (decl_context)
3683 error ("storage class specified for structure field `%s'",
3687 error ("storage class specified for parameter `%s'", name);
3690 error ("storage class specified for typename");
3693 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3694 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3695 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3698 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3700 /* `extern' with initialization is invalid if not at file scope. */
3701 if (current_scope == global_scope)
3702 warning ("`%s' initialized and declared `extern'", name);
3704 error ("`%s' has both `extern' and initializer", name);
3706 else if (current_scope == global_scope)
3708 if (specbits & 1 << (int) RID_AUTO)
3709 error ("file-scope declaration of `%s' specifies `auto'", name);
3713 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3714 error ("nested function `%s' declared `extern'", name);
3715 else if ((specbits & (1 << (int) RID_THREAD
3716 | 1 << (int) RID_EXTERN
3717 | 1 << (int) RID_STATIC))
3718 == (1 << (int) RID_THREAD))
3720 error ("function-scope `%s' implicitly auto and declared `__thread'",
3722 specbits &= ~(1 << (int) RID_THREAD);
3727 /* Now figure out the structure of the declarator proper.
3728 Descend through it, creating more complex types, until we reach
3729 the declared identifier (or NULL_TREE, in an absolute declarator). */
3731 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3733 if (type == error_mark_node)
3735 declarator = TREE_OPERAND (declarator, 0);
3739 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3740 an INDIRECT_REF (for *...),
3741 a CALL_EXPR (for ...(...)),
3742 a TREE_LIST (for nested attributes),
3743 an identifier (for the name being declared)
3744 or a null pointer (for the place in an absolute declarator
3745 where the name was omitted).
3746 For the last two cases, we have just exited the loop.
3748 At this point, TYPE is the type of elements of an array,
3749 or for a function to return, or for a pointer to point to.
3750 After this sequence of ifs, TYPE is the type of the
3751 array or function or pointer, and DECLARATOR has had its
3752 outermost layer removed. */
3754 if (array_ptr_quals != NULL_TREE || array_parm_static)
3756 /* Only the innermost declarator (making a parameter be of
3757 array type which is converted to pointer type)
3758 may have static or type qualifiers. */
3759 error ("static or type qualifiers in non-parameter array declarator");
3760 array_ptr_quals = NULL_TREE;
3761 array_parm_static = 0;
3764 if (TREE_CODE (declarator) == TREE_LIST)
3766 /* We encode a declarator with embedded attributes using
3768 tree attrs = TREE_PURPOSE (declarator);
3771 declarator = TREE_VALUE (declarator);
3772 inner_decl = declarator;
3773 while (inner_decl != NULL_TREE
3774 && TREE_CODE (inner_decl) == TREE_LIST)
3775 inner_decl = TREE_VALUE (inner_decl);
3776 if (inner_decl == NULL_TREE
3777 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3778 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3779 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3780 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3781 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3782 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3783 returned_attrs = decl_attributes (&type,
3784 chainon (returned_attrs, attrs),
3787 else if (TREE_CODE (declarator) == ARRAY_REF)
3789 tree itype = NULL_TREE;
3790 tree size = TREE_OPERAND (declarator, 1);
3791 /* The index is a signed object `sizetype' bits wide. */
3792 tree index_type = c_common_signed_type (sizetype);
3794 array_ptr_quals = TREE_TYPE (declarator);
3795 array_parm_static = TREE_STATIC (declarator);
3797 declarator = TREE_OPERAND (declarator, 0);
3799 /* Check for some types that there cannot be arrays of. */
3801 if (VOID_TYPE_P (type))
3803 error ("declaration of `%s' as array of voids", name);
3804 type = error_mark_node;
3807 if (TREE_CODE (type) == FUNCTION_TYPE)
3809 error ("declaration of `%s' as array of functions", name);
3810 type = error_mark_node;
3813 if (pedantic && flexible_array_type_p (type))
3814 pedwarn ("invalid use of structure with flexible array member");
3816 if (size == error_mark_node)
3817 type = error_mark_node;
3819 if (type == error_mark_node)
3822 /* If size was specified, set ITYPE to a range-type for that size.
3823 Otherwise, ITYPE remains null. finish_decl may figure it out
3824 from an initial value. */
3828 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3829 STRIP_TYPE_NOPS (size);
3831 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3833 error ("size of array `%s' has non-integer type", name);
3834 size = integer_one_node;
3837 if (pedantic && integer_zerop (size))
3838 pedwarn ("ISO C forbids zero-size array `%s'", name);
3840 if (TREE_CODE (size) == INTEGER_CST)
3842 constant_expression_warning (size);
3843 if (tree_int_cst_sgn (size) < 0)
3845 error ("size of array `%s' is negative", name);
3846 size = integer_one_node;
3851 /* Make sure the array size remains visibly nonconstant
3852 even if it is (eg) a const variable with known value. */
3855 if (!flag_isoc99 && pedantic)
3857 if (TREE_CONSTANT (size))
3858 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3861 pedwarn ("ISO C90 forbids variable-size array `%s'",
3866 if (integer_zerop (size))
3868 /* A zero-length array cannot be represented with an
3869 unsigned index type, which is what we'll get with
3870 build_index_type. Create an open-ended range instead. */
3871 itype = build_range_type (sizetype, size, NULL_TREE);
3875 /* Compute the maximum valid index, that is, size - 1.
3876 Do the calculation in index_type, so that if it is
3877 a variable the computations will be done in the
3879 itype = fold (build (MINUS_EXPR, index_type,
3880 convert (index_type, size),
3881 convert (index_type, size_one_node)));
3883 /* If that overflowed, the array is too big.
3884 ??? While a size of INT_MAX+1 technically shouldn't
3885 cause an overflow (because we subtract 1), the overflow
3886 is recorded during the conversion to index_type, before
3887 the subtraction. Handling this case seems like an
3888 unnecessary complication. */
3889 if (TREE_OVERFLOW (itype))
3891 error ("size of array `%s' is too large", name);
3892 type = error_mark_node;
3898 /* We must be able to distinguish the
3899 SAVE_EXPR_CONTEXT for the variably-sized type
3900 so that we can set it correctly in
3901 set_save_expr_context. The convention is
3902 that all SAVE_EXPRs that need to be reset
3903 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3904 tree cfd = current_function_decl;
3905 if (decl_context == PARM)
3906 current_function_decl = NULL_TREE;
3907 itype = variable_size (itype);
3908 if (decl_context == PARM)
3909 current_function_decl = cfd;
3911 itype = build_index_type (itype);
3914 else if (decl_context == FIELD)
3916 if (pedantic && !flag_isoc99 && !in_system_header)
3917 pedwarn ("ISO C90 does not support flexible array members");
3919 /* ISO C99 Flexible array members are effectively identical
3920 to GCC's zero-length array extension. */
3921 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3924 /* If pedantic, complain about arrays of incomplete types. */
3926 if (pedantic && !COMPLETE_TYPE_P (type))
3927 pedwarn ("array type has incomplete element type");
3929 /* Build the array type itself, then merge any constancy or
3930 volatility into the target type. We must do it in this order
3931 to ensure that the TYPE_MAIN_VARIANT field of the array type
3932 is set correctly. */
3934 type = build_array_type (type, itype);
3936 type = c_build_qualified_type (type, type_quals);
3939 C_TYPE_VARIABLE_SIZE (type) = 1;
3941 /* The GCC extension for zero-length arrays differs from
3942 ISO flexible array members in that sizeof yields zero. */
3943 if (size && integer_zerop (size))
3946 TYPE_SIZE (type) = bitsize_zero_node;
3947 TYPE_SIZE_UNIT (type) = size_zero_node;
3949 if (decl_context != PARM
3950 && (array_ptr_quals != NULL_TREE || array_parm_static))
3952 error ("static or type qualifiers in non-parameter array declarator");
3953 array_ptr_quals = NULL_TREE;
3954 array_parm_static = 0;
3957 else if (TREE_CODE (declarator) == CALL_EXPR)
3961 /* Declaring a function type.
3962 Make sure we have a valid type for the function to return. */
3963 if (type == error_mark_node)
3968 /* Warn about some types functions can't return. */
3970 if (TREE_CODE (type) == FUNCTION_TYPE)
3972 error ("`%s' declared as function returning a function", name);
3973 type = integer_type_node;
3975 if (TREE_CODE (type) == ARRAY_TYPE)
3977 error ("`%s' declared as function returning an array", name);
3978 type = integer_type_node;
3981 /* Construct the function type and go to the next
3982 inner layer of declarator. */
3984 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3986 /* Say it's a definition
3987 only for the CALL_EXPR
3988 closest to the identifier. */
3989 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3990 /* Type qualifiers before the return type of the function
3991 qualify the return type, not the function type. */
3994 /* Type qualifiers on a function return type are normally
3995 permitted by the standard but have no effect, so give a
3996 warning at -Wextra. Qualifiers on a void return type have
3997 meaning as a GNU extension, and are banned on function
3998 definitions in ISO C. FIXME: strictly we shouldn't
3999 pedwarn for qualified void return types except on function
4000 definitions, but not doing so could lead to the undesirable
4001 state of a "volatile void" function return type not being
4002 warned about, and a use of the function being compiled
4003 with GNU semantics, with no diagnostics under -pedantic. */
4004 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4005 pedwarn ("ISO C forbids qualified void function return type");
4006 else if (extra_warnings
4007 && !(VOID_TYPE_P (type)
4008 && type_quals == TYPE_QUAL_VOLATILE))
4009 warning ("type qualifiers ignored on function return type");
4011 type = c_build_qualified_type (type, type_quals);
4013 type_quals = TYPE_UNQUALIFIED;
4015 type = build_function_type (type, arg_types);
4016 declarator = TREE_OPERAND (declarator, 0);
4018 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4019 the formal parameter list of this FUNCTION_TYPE to point to
4020 the FUNCTION_TYPE node itself. */
4025 for (link = last_function_parm_tags;
4027 link = TREE_CHAIN (link))
4028 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4031 else if (TREE_CODE (declarator) == INDIRECT_REF)
4033 /* Merge any constancy or volatility into the target type
4036 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4038 pedwarn ("ISO C forbids qualified function types");
4040 type = c_build_qualified_type (type, type_quals);
4041 type_quals = TYPE_UNQUALIFIED;
4044 type = build_pointer_type (type);
4046 /* Process a list of type modifier keywords
4047 (such as const or volatile) that were given inside the `*'. */
4049 if (TREE_TYPE (declarator))
4057 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4058 typemodlist = TREE_CHAIN (typemodlist))
4060 tree qualifier = TREE_VALUE (typemodlist);
4062 if (C_IS_RESERVED_WORD (qualifier))
4064 if (C_RID_CODE (qualifier) == RID_CONST)
4066 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4068 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4078 error ("invalid type modifier within pointer declarator");
4079 if (constp > 1 && ! flag_isoc99)
4080 pedwarn ("duplicate `const'");
4081 if (volatilep > 1 && ! flag_isoc99)
4082 pedwarn ("duplicate `volatile'");
4083 if (restrictp > 1 && ! flag_isoc99)
4084 pedwarn ("duplicate `restrict'");
4086 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4087 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4088 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4091 declarator = TREE_OPERAND (declarator, 0);
4098 /* Now TYPE has the actual type. */
4100 /* Did array size calculations overflow? */
4102 if (TREE_CODE (type) == ARRAY_TYPE
4103 && COMPLETE_TYPE_P (type)
4104 && TREE_OVERFLOW (TYPE_SIZE (type)))
4106 error ("size of array `%s' is too large", name);
4107 /* If we proceed with the array type as it is, we'll eventually
4108 crash in tree_low_cst(). */
4109 type = error_mark_node;
4112 /* If this is declaring a typedef name, return a TYPE_DECL. */
4114 if (specbits & (1 << (int) RID_TYPEDEF))
4117 /* Note that the grammar rejects storage classes
4118 in typenames, fields or parameters */
4119 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4121 pedwarn ("ISO C forbids qualified function types");
4123 type = c_build_qualified_type (type, type_quals);
4124 decl = build_decl (TYPE_DECL, declarator, type);
4125 if ((specbits & (1 << (int) RID_SIGNED))
4126 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4127 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4128 decl_attributes (&decl, returned_attrs, 0);
4132 /* Detect the case of an array type of unspecified size
4133 which came, as such, direct from a typedef name.
4134 We must copy the type, so that each identifier gets
4135 a distinct type, so that each identifier's size can be
4136 controlled separately by its own initializer. */
4138 if (type != 0 && typedef_type != 0
4139 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4140 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4142 type = build_array_type (TREE_TYPE (type), 0);
4144 C_TYPE_VARIABLE_SIZE (type) = 1;
4147 /* If this is a type name (such as, in a cast or sizeof),
4148 compute the type and return it now. */
4150 if (decl_context == TYPENAME)
4152 /* Note that the grammar rejects storage classes
4153 in typenames, fields or parameters */
4154 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4156 pedwarn ("ISO C forbids const or volatile function types");
4158 type = c_build_qualified_type (type, type_quals);
4159 decl_attributes (&type, returned_attrs, 0);
4163 /* Aside from typedefs and type names (handle above),
4164 `void' at top level (not within pointer)
4165 is allowed only in public variables.
4166 We don't complain about parms either, but that is because
4167 a better error message can be made later. */
4169 if (VOID_TYPE_P (type) && decl_context != PARM
4170 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4171 && ((specbits & (1 << (int) RID_EXTERN))
4172 || (current_scope == global_scope
4174 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4176 error ("variable or field `%s' declared void", name);
4177 type = integer_type_node;
4180 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4181 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4186 if (decl_context == PARM)
4188 tree type_as_written;
4191 /* A parameter declared as an array of T is really a pointer to T.
4192 One declared as a function is really a pointer to a function. */
4194 if (TREE_CODE (type) == ARRAY_TYPE)
4196 /* Transfer const-ness of array into that of type pointed to. */
4197 type = TREE_TYPE (type);
4199 type = c_build_qualified_type (type, type_quals);
4200 type = build_pointer_type (type);
4201 type_quals = TYPE_UNQUALIFIED;
4202 if (array_ptr_quals)
4204 tree new_ptr_quals, new_ptr_attrs;
4206 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4207 /* We don't yet implement attributes in this context. */
4208 if (new_ptr_attrs != NULL_TREE)
4209 warning ("attributes in parameter array declarator ignored");
4214 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4216 tree qualifier = TREE_VALUE (new_ptr_quals);
4218 if (C_IS_RESERVED_WORD (qualifier))
4220 if (C_RID_CODE (qualifier) == RID_CONST)
4222 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4224 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4234 error ("invalid type modifier within array declarator");
4236 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4237 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4238 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4242 else if (TREE_CODE (type) == FUNCTION_TYPE)
4244 if (pedantic && type_quals)
4245 pedwarn ("ISO C forbids qualified function types");
4247 type = c_build_qualified_type (type, type_quals);
4248 type = build_pointer_type (type);
4249 type_quals = TYPE_UNQUALIFIED;
4251 else if (type_quals)
4252 type = c_build_qualified_type (type, type_quals);
4254 type_as_written = type;
4256 decl = build_decl (PARM_DECL, declarator, type);
4258 C_DECL_VARIABLE_SIZE (decl) = 1;
4260 /* Compute the type actually passed in the parmlist,
4261 for the case where there is no prototype.
4262 (For example, shorts and chars are passed as ints.)
4263 When there is a prototype, this is overridden later. */
4265 if (type == error_mark_node)
4266 promoted_type = type;
4268 promoted_type = c_type_promotes_to (type);
4270 DECL_ARG_TYPE (decl) = promoted_type;
4271 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4273 else if (decl_context == FIELD)
4275 /* Structure field. It may not be a function. */
4277 if (TREE_CODE (type) == FUNCTION_TYPE)
4279 error ("field `%s' declared as a function", name);
4280 type = build_pointer_type (type);
4282 else if (TREE_CODE (type) != ERROR_MARK
4283 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4285 error ("field `%s' has incomplete type", name);
4286 type = error_mark_node;
4288 /* Move type qualifiers down to element of an array. */
4289 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4290 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4292 TYPE_DOMAIN (type));
4293 decl = build_decl (FIELD_DECL, declarator, type);
4294 DECL_NONADDRESSABLE_P (decl) = bitfield;
4297 C_DECL_VARIABLE_SIZE (decl) = 1;
4299 else if (TREE_CODE (type) == FUNCTION_TYPE)
4301 /* Every function declaration is "external"
4302 except for those which are inside a function body
4303 in which `auto' is used.
4304 That is a case not specified by ANSI C,
4305 and we use it for forward declarations for nested functions. */
4306 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4307 || current_scope == global_scope);
4309 if (specbits & (1 << (int) RID_AUTO)
4310 && (pedantic || current_scope == global_scope))
4311 pedwarn ("invalid storage class for function `%s'", name);
4312 if (specbits & (1 << (int) RID_REGISTER))
4313 error ("invalid storage class for function `%s'", name);
4314 if (specbits & (1 << (int) RID_THREAD))
4315 error ("invalid storage class for function `%s'", name);
4316 /* Function declaration not at file scope.
4317 Storage classes other than `extern' are not allowed
4318 and `extern' makes no difference. */
4319 if (current_scope != global_scope
4320 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4322 pedwarn ("invalid storage class for function `%s'", name);
4324 decl = build_decl (FUNCTION_DECL, declarator, type);
4325 decl = build_decl_attribute_variant (decl, decl_attr);
4327 DECL_LANG_SPECIFIC (decl)
4328 = ggc_alloc_cleared (sizeof (struct lang_decl));
4330 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4331 pedwarn ("ISO C forbids qualified function types");
4333 /* GNU C interprets a `volatile void' return type to indicate
4334 that the function does not return. */
4335 if ((type_quals & TYPE_QUAL_VOLATILE)
4336 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4337 warning ("`noreturn' function returns non-void value");
4340 DECL_EXTERNAL (decl) = 1;
4341 /* Record absence of global scope for `static' or `auto'. */
4343 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4346 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4348 /* Record presence of `inline', if it is reasonable. */
4349 if (MAIN_NAME_P (declarator))
4352 warning ("cannot inline function `main'");
4356 /* Record that the function is declared `inline'. */
4357 DECL_DECLARED_INLINE_P (decl) = 1;
4359 /* Do not mark bare declarations as DECL_INLINE. Doing so
4360 in the presence of multiple declarations can result in
4361 the abstract origin pointing between the declarations,
4362 which will confuse dwarf2out. */
4365 DECL_INLINE (decl) = 1;
4366 if (specbits & (1 << (int) RID_EXTERN))
4367 current_extern_inline = 1;
4370 /* If -finline-functions, assume it can be inlined. This does
4371 two things: let the function be deferred until it is actually
4372 needed, and let dwarf2 know that the function is inlinable. */
4373 else if (flag_inline_trees == 2 && initialized)
4374 DECL_INLINE (decl) = 1;
4378 /* It's a variable. */
4379 /* An uninitialized decl with `extern' is a reference. */
4380 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4382 /* Move type qualifiers down to element of an array. */
4383 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4385 int saved_align = TYPE_ALIGN(type);
4386 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4388 TYPE_DOMAIN (type));
4389 TYPE_ALIGN (type) = saved_align;
4391 else if (type_quals)
4392 type = c_build_qualified_type (type, type_quals);
4394 /* It is invalid to create an `extern' declaration for a
4395 variable if there is a global declaration that is
4397 if (extern_ref && current_scope != global_scope)
4401 global_decl = identifier_global_value (declarator);
4403 && TREE_CODE (global_decl) == VAR_DECL
4404 && !TREE_PUBLIC (global_decl))
4405 error ("variable previously declared `static' redeclared "
4409 decl = build_decl (VAR_DECL, declarator, type);
4411 C_DECL_VARIABLE_SIZE (decl) = 1;
4414 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4416 DECL_EXTERNAL (decl) = extern_ref;
4418 /* At file scope, the presence of a `static' or `register' storage
4419 class specifier, or the absence of all storage class specifiers
4420 makes this declaration a definition (perhaps tentative). Also,
4421 the absence of both `static' and `register' makes it public. */
4422 if (current_scope == global_scope)
4424 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4425 | (1 << (int) RID_REGISTER)));
4426 TREE_STATIC (decl) = !extern_ref;
4428 /* Not at file scope, only `static' makes a static definition. */
4431 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4432 TREE_PUBLIC (decl) = extern_ref;
4435 if (specbits & 1 << (int) RID_THREAD)
4437 if (targetm.have_tls)
4438 DECL_THREAD_LOCAL (decl) = 1;
4440 /* A mere warning is sure to result in improper semantics
4441 at runtime. Don't bother to allow this to compile. */
4442 error ("thread-local storage not supported for this target");
4446 /* Record `register' declaration for warnings on &
4447 and in case doing stupid register allocation. */
4449 if (specbits & (1 << (int) RID_REGISTER))
4450 DECL_REGISTER (decl) = 1;
4452 /* Record constancy and volatility. */
4453 c_apply_type_quals_to_decl (type_quals, decl);
4455 /* If a type has volatile components, it should be stored in memory.
4456 Otherwise, the fact that those components are volatile
4457 will be ignored, and would even crash the compiler. */
4458 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4459 c_mark_addressable (decl);
4461 #ifdef ENABLE_CHECKING
4462 /* This is the earliest point at which we might know the assembler
4463 name of a variable. Thus, if it's known before this, die horribly. */
4464 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4468 decl_attributes (&decl, returned_attrs, 0);
4474 /* Decode the parameter-list info for a function type or function definition.
4475 The argument is the value returned by `get_parm_info' (or made in parse.y
4476 if there is an identifier list instead of a parameter decl list).
4477 These two functions are separate because when a function returns
4478 or receives functions then each is called multiple times but the order
4479 of calls is different. The last call to `grokparms' is always the one
4480 that contains the formal parameter names of a function definition.
4482 Store in `last_function_parms' a chain of the decls of parms.
4483 Also store in `last_function_parm_tags' a chain of the struct, union,
4484 and enum tags declared among the parms.
4486 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4488 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4489 a mere declaration. A nonempty identifier-list gets an error message
4490 when FUNCDEF_FLAG is zero. */
4493 grokparms (tree parms_info, int funcdef_flag)
4495 tree first_parm = TREE_CHAIN (parms_info);
4497 last_function_parms = TREE_PURPOSE (parms_info);
4498 last_function_parm_tags = TREE_VALUE (parms_info);
4499 last_function_parm_others = TREE_TYPE (parms_info);
4501 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4502 && !in_system_header)
4503 warning ("function declaration isn't a prototype");
4506 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4509 pedwarn ("parameter names (without types) in function declaration");
4511 last_function_parms = first_parm;
4518 /* If the arg types are incomplete in a declaration,
4519 they must include undefined tags.
4520 These tags can never be defined in the scope of the declaration,
4521 so the types can never be completed,
4522 and no call can be compiled successfully. */
4524 for (parm = last_function_parms, typelt = first_parm;
4526 parm = TREE_CHAIN (parm))
4527 /* Skip over any enumeration constants declared here. */
4528 if (TREE_CODE (parm) == PARM_DECL)
4530 /* Barf if the parameter itself has an incomplete type. */
4531 tree type = TREE_VALUE (typelt);
4532 if (type == error_mark_node)
4534 if (!COMPLETE_TYPE_P (type))
4536 if (funcdef_flag && DECL_NAME (parm) != 0)
4537 error ("parameter `%s' has incomplete type",
4538 IDENTIFIER_POINTER (DECL_NAME (parm)));
4540 warning ("parameter has incomplete type");
4543 TREE_VALUE (typelt) = error_mark_node;
4544 TREE_TYPE (parm) = error_mark_node;
4547 typelt = TREE_CHAIN (typelt);
4554 /* Return a tree_list node with info on a parameter list just parsed.
4555 The TREE_PURPOSE is a list of decls of those parms.
4556 The TREE_VALUE is a list of structure, union and enum tags defined.
4557 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4558 The TREE_TYPE is a list of non-parameter decls which appeared with the
4560 This tree_list node is later fed to `grokparms'.
4562 VOID_AT_END nonzero means append `void' to the end of the type-list.
4563 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4566 get_parm_info (int void_at_end)
4568 tree decl, type, list;
4570 tree *last_type = &types;
4571 tree tags = current_scope->tags;
4572 tree parms = current_scope->parms;
4573 tree others = current_scope->names;
4574 static bool explained_incomplete_types = false;
4575 bool gave_void_only_once_err = false;
4577 /* Just "void" (and no ellipsis) is special. There are really no parms.
4578 But if the "void" is qualified (by "const" or "volatile"), or has a
4579 storage class specifier ("register"), then the behavior is undefined;
4580 issue an error. Typedefs for "void" are OK (see DR#157). */
4581 if (void_at_end && parms != 0
4582 && TREE_CHAIN (parms) == 0
4583 && VOID_TYPE_P (TREE_TYPE (parms))
4584 && !DECL_NAME (parms))
4586 if (TREE_THIS_VOLATILE (parms)
4587 || TREE_READONLY (parms)
4588 || DECL_REGISTER (parms))
4589 error ("\"void\" as only parameter may not be qualified");
4591 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4594 /* Sanity check all of the parameter declarations. */
4595 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4597 if (TREE_CODE (decl) != PARM_DECL)
4599 if (TREE_ASM_WRITTEN (decl))
4602 /* Since there is a prototype, args are passed in their
4603 declared types. The back end may override this. */
4604 type = TREE_TYPE (decl);
4605 DECL_ARG_TYPE (decl) = type;
4607 /* Check for (..., void, ...) and issue an error. */
4608 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4610 error ("\"void\" must be the only parameter");
4611 gave_void_only_once_err = true;
4614 type = build_tree_list (0, type);
4616 last_type = &TREE_CHAIN (type);
4619 /* Check the list of non-parameter decls for any forward parm decls
4620 that never got real decls. */
4621 for (decl = others; decl; decl = TREE_CHAIN (decl))
4622 if (TREE_CODE (decl) == PARM_DECL)
4624 if (!TREE_ASM_WRITTEN (decl))
4627 error ("%Jparameter \"%D\" has just a forward declaration",
4631 /* Warn about any struct, union or enum tags defined within this
4632 list. The scope of such types is limited to this declaration,
4633 which is rarely if ever desirable (it's impossible to call such
4634 a function with type-correct arguments). */
4635 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4637 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4638 const char *keyword;
4639 /* An anonymous union parm type is meaningful as a GNU extension.
4640 So don't warn for that. */
4641 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4644 /* The keyword should not be translated. */
4647 case RECORD_TYPE: keyword = "struct"; break;
4648 case UNION_TYPE: keyword = "union"; break;
4649 case ENUMERAL_TYPE: keyword = "enum"; break;
4653 if (TREE_PURPOSE (decl))
4654 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4655 warning ("\"%s %s\" declared inside parameter list",
4656 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4658 /* The %s will be one of 'struct', 'union', or 'enum'. */
4659 warning ("anonymous %s declared inside parameter list", keyword);
4661 if (! explained_incomplete_types)
4663 warning ("its scope is only this definition or declaration,"
4664 " which is probably not what you want");
4665 explained_incomplete_types = true;
4672 type = build_tree_list (0, void_type_node);
4676 list = tree_cons (parms, tags, types);
4677 TREE_TYPE (list) = others;
4681 /* Get the struct, enum or union (CODE says which) with tag NAME.
4682 Define the tag as a forward-reference if it is not defined. */
4685 xref_tag (enum tree_code code, tree name)
4687 /* If a cross reference is requested, look up the type
4688 already defined for this tag and return it. */
4690 tree ref = lookup_tag (code, name, 0);
4691 /* If this is the right type of tag, return what we found.
4692 (This reference will be shadowed by shadow_tag later if appropriate.)
4693 If this is the wrong type of tag, do not return it. If it was the
4694 wrong type in the same scope, we will have had an error
4695 message already; if in a different scope and declaring
4696 a name, pending_xref_error will give an error message; but if in a
4697 different scope and not declaring a name, this tag should
4698 shadow the previous declaration of a different type of tag, and
4699 this would not work properly if we return the reference found.
4700 (For example, with "struct foo" in an outer scope, "union foo;"
4701 must shadow that tag with a new one of union type.) */
4702 if (ref && TREE_CODE (ref) == code)
4705 /* If no such tag is yet defined, create a forward-reference node
4706 and record it as the "definition".
4707 When a real declaration of this type is found,
4708 the forward-reference will be altered into a real type. */
4710 ref = make_node (code);
4711 if (code == ENUMERAL_TYPE)
4713 /* Give the type a default layout like unsigned int
4714 to avoid crashing if it does not get defined. */
4715 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4716 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4717 TYPE_USER_ALIGN (ref) = 0;
4718 TREE_UNSIGNED (ref) = 1;
4719 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4720 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4721 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4724 pushtag (name, ref);
4729 /* Make sure that the tag NAME is defined *in the current scope*
4730 at least as a forward reference.
4731 CODE says which kind of tag NAME ought to be. */
4734 start_struct (enum tree_code code, tree name)
4736 /* If there is already a tag defined at this scope
4737 (as a forward reference), just return it. */
4742 ref = lookup_tag (code, name, 1);
4743 if (ref && TREE_CODE (ref) == code)
4745 if (TYPE_FIELDS (ref))
4747 if (code == UNION_TYPE)
4748 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4750 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4755 /* Otherwise create a forward-reference just so the tag is in scope. */
4757 ref = make_node (code);
4758 pushtag (name, ref);
4761 C_TYPE_BEING_DEFINED (ref) = 1;
4762 TYPE_PACKED (ref) = flag_pack_struct;
4766 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4767 of a structure component, returning a FIELD_DECL node.
4768 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4770 This is done during the parsing of the struct declaration.
4771 The FIELD_DECL nodes are chained together and the lot of them
4772 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4775 grokfield (tree declarator, tree declspecs, tree width)
4779 if (declarator == NULL_TREE && width == NULL_TREE)
4781 /* This is an unnamed decl.
4783 If we have something of the form "union { list } ;" then this
4784 is the anonymous union extension. Similarly for struct.
4786 If this is something of the form "struct foo;", then
4787 If MS extensions are enabled, this is handled as an
4789 Otherwise this is a forward declaration of a structure tag.
4791 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4792 If MS extensions are enabled and foo names a structure, then
4793 again this is an anonymous struct.
4794 Otherwise this is an error.
4796 Oh what a horrid tangled web we weave. I wonder if MS consciously
4797 took this from Plan 9 or if it was an accident of implementation
4798 that took root before someone noticed the bug... */
4800 tree type = TREE_VALUE (declspecs);
4802 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4803 type = TREE_TYPE (type);
4804 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4806 if (flag_ms_extensions)
4809 goto warn_unnamed_field;
4810 else if (TYPE_NAME (type) == NULL)
4813 goto warn_unnamed_field;
4818 warning ("declaration does not declare anything");
4823 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4824 width ? &width : NULL);
4826 finish_decl (value, NULL_TREE, NULL_TREE);
4827 DECL_INITIAL (value) = width;
4832 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4833 the list such that this does not present a problem later. */
4836 detect_field_duplicates (tree fieldlist)
4841 /* First, see if there are more than "a few" fields.
4842 This is trivially true if there are zero or one fields. */
4845 x = TREE_CHAIN (fieldlist);
4851 } while (timeout > 0 && x);
4853 /* If there were "few" fields, avoid the overhead of allocating
4854 a hash table. Instead just do the nested traversal thing. */
4857 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4860 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4861 if (DECL_NAME (y) == DECL_NAME (x))
4863 error ("%Jduplicate member '%D'", x, x);
4864 DECL_NAME (x) = NULL_TREE;
4870 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4873 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4874 if ((y = DECL_NAME (x)) != 0)
4876 slot = htab_find_slot (htab, y, INSERT);
4879 error ("%Jduplicate member '%D'", x, x);
4880 DECL_NAME (x) = NULL_TREE;
4889 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4890 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4891 ATTRIBUTES are attributes to be applied to the structure. */
4894 finish_struct (tree t, tree fieldlist, tree attributes)
4897 int toplevel = global_scope == current_scope;
4898 int saw_named_field;
4900 /* If this type was previously laid out as a forward reference,
4901 make sure we lay it out again. */
4905 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4907 /* Nameless union parm types are useful as GCC extension. */
4908 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4909 /* Otherwise, warn about any struct or union def. in parmlist. */
4910 if (in_parm_level_p ())
4913 pedwarn ("%s defined inside parms",
4914 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4916 warning ("%s defined inside parms",
4917 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4922 for (x = fieldlist; x; x = TREE_CHAIN (x))
4923 if (DECL_NAME (x) != 0)
4927 pedwarn ("%s has no %s",
4928 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4929 fieldlist ? _("named members") : _("members"));
4932 /* Install struct as DECL_CONTEXT of each field decl.
4933 Also process specified field sizes,m which is found in the DECL_INITIAL.
4934 Store 0 there, except for ": 0" fields (so we can find them
4935 and delete them, below). */
4937 saw_named_field = 0;
4938 for (x = fieldlist; x; x = TREE_CHAIN (x))
4940 DECL_CONTEXT (x) = t;
4941 DECL_PACKED (x) |= TYPE_PACKED (t);
4943 /* If any field is const, the structure type is pseudo-const. */
4944 if (TREE_READONLY (x))
4945 C_TYPE_FIELDS_READONLY (t) = 1;
4948 /* A field that is pseudo-const makes the structure likewise. */
4949 tree t1 = TREE_TYPE (x);
4950 while (TREE_CODE (t1) == ARRAY_TYPE)
4951 t1 = TREE_TYPE (t1);
4952 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4953 && C_TYPE_FIELDS_READONLY (t1))
4954 C_TYPE_FIELDS_READONLY (t) = 1;
4957 /* Any field that is volatile means variables of this type must be
4958 treated in some ways as volatile. */
4959 if (TREE_THIS_VOLATILE (x))
4960 C_TYPE_FIELDS_VOLATILE (t) = 1;
4962 /* Any field of nominal variable size implies structure is too. */
4963 if (C_DECL_VARIABLE_SIZE (x))
4964 C_TYPE_VARIABLE_SIZE (t) = 1;
4966 /* Detect invalid nested redefinition. */
4967 if (TREE_TYPE (x) == t)
4968 error ("nested redefinition of `%s'",
4969 IDENTIFIER_POINTER (TYPE_NAME (t)));
4971 if (DECL_INITIAL (x))
4973 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
4974 DECL_SIZE (x) = bitsize_int (width);
4975 DECL_BIT_FIELD (x) = 1;
4976 SET_DECL_C_BIT_FIELD (x);
4979 DECL_INITIAL (x) = 0;
4981 /* Detect flexible array member in an invalid context. */
4982 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4983 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4984 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4985 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4987 if (TREE_CODE (t) == UNION_TYPE)
4988 error ("%Jflexible array member in union", x);
4989 else if (TREE_CHAIN (x) != NULL_TREE)
4990 error ("%Jflexible array member not at end of struct", x);
4991 else if (! saw_named_field)
4992 error ("%Jflexible array member in otherwise empty struct", x);
4995 if (pedantic && TREE_CODE (t) == RECORD_TYPE
4996 && flexible_array_type_p (TREE_TYPE (x)))
4997 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5000 saw_named_field = 1;
5003 detect_field_duplicates (fieldlist);
5005 /* Now we have the nearly final fieldlist. Record it,
5006 then lay out the structure or union (including the fields). */
5008 TYPE_FIELDS (t) = fieldlist;
5012 /* Delete all zero-width bit-fields from the fieldlist. */
5014 tree *fieldlistp = &fieldlist;
5016 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5017 *fieldlistp = TREE_CHAIN (*fieldlistp);
5019 fieldlistp = &TREE_CHAIN (*fieldlistp);
5022 /* Now we have the truly final field list.
5023 Store it in this type and in the variants. */
5025 TYPE_FIELDS (t) = fieldlist;
5027 /* If there are lots of fields, sort so we can look through them fast.
5028 We arbitrarily consider 16 or more elts to be "a lot". */
5033 for (x = fieldlist; x; x = TREE_CHAIN (x))
5035 if (len > 15 || DECL_NAME (x) == NULL)
5043 struct lang_type *space;
5044 struct sorted_fields_type *space2;
5046 len += list_length (x);
5048 /* Use the same allocation policy here that make_node uses, to
5049 ensure that this lives as long as the rest of the struct decl.
5050 All decls in an inline function need to be saved. */
5052 space = ggc_alloc (sizeof (struct lang_type));
5053 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5057 field_array = &space2->elts[0];
5058 for (x = fieldlist; x; x = TREE_CHAIN (x))
5060 field_array[len++] = x;
5062 /* If there is anonymous struct or union, break out of the loop. */
5063 if (DECL_NAME (x) == NULL)
5066 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5069 TYPE_LANG_SPECIFIC (t) = space;
5070 TYPE_LANG_SPECIFIC (t)->s->len = len;
5071 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5072 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5077 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5079 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5080 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5081 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5082 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5085 /* If this was supposed to be a transparent union, but we can't
5086 make it one, warn and turn off the flag. */
5087 if (TREE_CODE (t) == UNION_TYPE
5088 && TYPE_TRANSPARENT_UNION (t)
5089 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5091 TYPE_TRANSPARENT_UNION (t) = 0;
5092 warning ("union cannot be made transparent");
5095 /* If this structure or union completes the type of any previous
5096 variable declaration, lay it out and output its rtl. */
5097 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5101 tree decl = TREE_VALUE (x);
5102 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5103 layout_array_type (TREE_TYPE (decl));
5104 if (TREE_CODE (decl) != TYPE_DECL)
5106 layout_decl (decl, 0);
5107 if (c_dialect_objc ())
5108 objc_check_decl (decl);
5109 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5114 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5116 /* Finish debugging output for this type. */
5117 rest_of_type_compilation (t, toplevel);
5122 /* Lay out the type T, and its element type, and so on. */
5125 layout_array_type (tree t)
5127 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5128 layout_array_type (TREE_TYPE (t));
5132 /* Begin compiling the definition of an enumeration type.
5133 NAME is its name (or null if anonymous).
5134 Returns the type object, as yet incomplete.
5135 Also records info about it so that build_enumerator
5136 may be used to declare the individual values as they are read. */
5139 start_enum (tree name)
5143 /* If this is the real definition for a previous forward reference,
5144 fill in the contents in the same object that used to be the
5145 forward reference. */
5148 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5150 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5152 enumtype = make_node (ENUMERAL_TYPE);
5153 pushtag (name, enumtype);
5156 C_TYPE_BEING_DEFINED (enumtype) = 1;
5158 if (TYPE_VALUES (enumtype) != 0)
5160 /* This enum is a named one that has been declared already. */
5161 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5163 /* Completely replace its old definition.
5164 The old enumerators remain defined, however. */
5165 TYPE_VALUES (enumtype) = 0;
5168 enum_next_value = integer_zero_node;
5171 if (flag_short_enums)
5172 TYPE_PACKED (enumtype) = 1;
5177 /* After processing and defining all the values of an enumeration type,
5178 install their decls in the enumeration type and finish it off.
5179 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5180 and ATTRIBUTES are the specified attributes.
5181 Returns ENUMTYPE. */
5184 finish_enum (tree enumtype, tree values, tree attributes)
5187 tree minnode = 0, maxnode = 0, enum_value_type;
5188 int precision, unsign;
5189 int toplevel = (global_scope == current_scope);
5191 if (in_parm_level_p ())
5192 warning ("enum defined inside parms");
5194 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5196 /* Calculate the maximum value of any enumerator in this type. */
5198 if (values == error_mark_node)
5199 minnode = maxnode = integer_zero_node;
5202 minnode = maxnode = TREE_VALUE (values);
5203 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5205 tree value = TREE_VALUE (pair);
5206 if (tree_int_cst_lt (maxnode, value))
5208 if (tree_int_cst_lt (value, minnode))
5213 /* Construct the final type of this enumeration. It is the same
5214 as one of the integral types - the narrowest one that fits, except
5215 that normally we only go as narrow as int - and signed iff any of
5216 the values are negative. */
5217 unsign = (tree_int_cst_sgn (minnode) >= 0);
5218 precision = MAX (min_precision (minnode, unsign),
5219 min_precision (maxnode, unsign));
5220 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5222 tree narrowest = c_common_type_for_size (precision, unsign);
5225 warning ("enumeration values exceed range of largest integer");
5226 narrowest = long_long_integer_type_node;
5229 precision = TYPE_PRECISION (narrowest);
5232 precision = TYPE_PRECISION (integer_type_node);
5234 if (precision == TYPE_PRECISION (integer_type_node))
5235 enum_value_type = c_common_type_for_size (precision, 0);
5237 enum_value_type = enumtype;
5239 TYPE_MIN_VALUE (enumtype) = minnode;
5240 TYPE_MAX_VALUE (enumtype) = maxnode;
5241 TYPE_PRECISION (enumtype) = precision;
5242 TREE_UNSIGNED (enumtype) = unsign;
5243 TYPE_SIZE (enumtype) = 0;
5244 layout_type (enumtype);
5246 if (values != error_mark_node)
5248 /* Change the type of the enumerators to be the enum type. We
5249 need to do this irrespective of the size of the enum, for
5250 proper type checking. Replace the DECL_INITIALs of the
5251 enumerators, and the value slots of the list, with copies
5252 that have the enum type; they cannot be modified in place
5253 because they may be shared (e.g. integer_zero_node) Finally,
5254 change the purpose slots to point to the names of the decls. */
5255 for (pair = values; pair; pair = TREE_CHAIN (pair))
5257 tree enu = TREE_PURPOSE (pair);
5259 TREE_TYPE (enu) = enumtype;
5261 /* The ISO C Standard mandates enumerators to have type int,
5262 even though the underlying type of an enum type is
5263 unspecified. Here we convert any enumerators that fit in
5264 an int to type int, to avoid promotions to unsigned types
5265 when comparing integers with enumerators that fit in the
5266 int range. When -pedantic is given, build_enumerator()
5267 would have already taken care of those that don't fit. */
5268 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5269 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5271 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5273 TREE_PURPOSE (pair) = DECL_NAME (enu);
5274 TREE_VALUE (pair) = DECL_INITIAL (enu);
5277 TYPE_VALUES (enumtype) = values;
5280 /* Fix up all variant types of this enum type. */
5281 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5283 if (tem == enumtype)
5285 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5286 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5287 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5288 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5289 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5290 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5291 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5292 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5293 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5294 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5297 /* Finish debugging output for this type. */
5298 rest_of_type_compilation (enumtype, toplevel);
5303 /* Build and install a CONST_DECL for one value of the
5304 current enumeration type (one that was begun with start_enum).
5305 Return a tree-list containing the CONST_DECL and its value.
5306 Assignment of sequential values by default is handled here. */
5309 build_enumerator (tree name, tree value)
5313 /* Validate and default VALUE. */
5315 /* Remove no-op casts from the value. */
5317 STRIP_TYPE_NOPS (value);
5321 if (TREE_CODE (value) == INTEGER_CST)
5323 value = default_conversion (value);
5324 constant_expression_warning (value);
5328 error ("enumerator value for `%s' not integer constant",
5329 IDENTIFIER_POINTER (name));
5334 /* Default based on previous value. */
5335 /* It should no longer be possible to have NON_LVALUE_EXPR
5339 value = enum_next_value;
5341 error ("overflow in enumeration values");
5344 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5346 pedwarn ("ISO C restricts enumerator values to range of `int'");
5347 value = convert (integer_type_node, value);
5350 /* Set basis for default for next value. */
5351 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5352 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5354 /* Now create a declaration for the enum value name. */
5356 type = TREE_TYPE (value);
5357 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5358 TYPE_PRECISION (integer_type_node)),
5359 (TYPE_PRECISION (type)
5360 >= TYPE_PRECISION (integer_type_node)
5361 && TREE_UNSIGNED (type)));
5363 decl = build_decl (CONST_DECL, name, type);
5364 DECL_INITIAL (decl) = convert (type, value);
5367 return tree_cons (decl, value, NULL_TREE);
5371 /* Create the FUNCTION_DECL for a function definition.
5372 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5373 the declaration; they describe the function's name and the type it returns,
5374 but twisted together in a fashion that parallels the syntax of C.
5376 This function creates a binding context for the function body
5377 as well as setting up the FUNCTION_DECL in current_function_decl.
5379 Returns 1 on success. If the DECLARATOR is not suitable for a function
5380 (it defines a datum instead), we return 0, which tells
5381 yyparse to report a parse error. */
5384 start_function (tree declspecs, tree declarator, tree attributes)
5386 tree decl1, old_decl;
5388 int old_immediate_size_expand = immediate_size_expand;
5390 current_function_returns_value = 0; /* Assume, until we see it does. */
5391 current_function_returns_null = 0;
5392 current_function_returns_abnormally = 0;
5393 warn_about_return_type = 0;
5394 current_extern_inline = 0;
5395 c_in_iteration_stmt = 0;
5398 /* Don't expand any sizes in the return type of the function. */
5399 immediate_size_expand = 0;
5401 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5403 /* If the declarator is not suitable for a function definition,
5404 cause a syntax error. */
5407 immediate_size_expand = old_immediate_size_expand;
5411 decl_attributes (&decl1, attributes, 0);
5413 if (DECL_DECLARED_INLINE_P (decl1)
5414 && DECL_UNINLINABLE (decl1)
5415 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5416 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5418 announce_function (decl1);
5420 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5422 error ("return type is an incomplete type");
5423 /* Make it return void instead. */
5425 = build_function_type (void_type_node,
5426 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5429 if (warn_about_return_type)
5430 pedwarn_c99 ("return type defaults to `int'");
5432 /* Save the parm names or decls from this function's declarator
5433 where store_parm_decls will find them. */
5434 current_function_parms = last_function_parms;
5435 current_function_parm_tags = last_function_parm_tags;
5436 current_function_parm_others = last_function_parm_others;
5438 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5439 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5440 DECL_INITIAL (decl1) = error_mark_node;
5442 /* If this definition isn't a prototype and we had a prototype declaration
5443 before, copy the arg type info from that prototype.
5444 But not if what we had before was a builtin function. */
5445 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5446 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5447 && !DECL_BUILT_IN (old_decl)
5448 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5449 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5450 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5452 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5453 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5456 /* Optionally warn of old-fashioned def with no previous prototype. */
5457 if (warn_strict_prototypes
5458 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5459 && C_DECL_ISNT_PROTOTYPE (old_decl))
5460 warning ("function declaration isn't a prototype");
5461 /* Optionally warn of any global def with no previous prototype. */
5462 else if (warn_missing_prototypes
5463 && TREE_PUBLIC (decl1)
5464 && ! MAIN_NAME_P (DECL_NAME (decl1))
5465 && C_DECL_ISNT_PROTOTYPE (old_decl))
5466 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5467 /* Optionally warn of any def with no previous prototype
5468 if the function has already been used. */
5469 else if (warn_missing_prototypes
5470 && old_decl != 0 && TREE_USED (old_decl)
5471 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5472 warning ("%J'%D' was used with no prototype before its definition",
5474 /* Optionally warn of any global def with no previous declaration. */
5475 else if (warn_missing_declarations
5476 && TREE_PUBLIC (decl1)
5478 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5479 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5480 /* Optionally warn of any def with no previous declaration
5481 if the function has already been used. */
5482 else if (warn_missing_declarations
5483 && old_decl != 0 && TREE_USED (old_decl)
5484 && C_DECL_IMPLICIT (old_decl))
5485 warning ("%J`%D' was used with no declaration before its definition",
5488 /* This is a definition, not a reference.
5489 So normally clear DECL_EXTERNAL.
5490 However, `extern inline' acts like a declaration
5491 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5492 DECL_EXTERNAL (decl1) = current_extern_inline;
5494 /* This function exists in static storage.
5495 (This does not mean `static' in the C sense!) */
5496 TREE_STATIC (decl1) = 1;
5498 /* A nested function is not global. */
5499 if (current_function_decl != 0)
5500 TREE_PUBLIC (decl1) = 0;
5502 #ifdef ENABLE_CHECKING
5503 /* This is the earliest point at which we might know the assembler
5504 name of the function. Thus, if it's set before this, die horribly. */
5505 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5509 /* If #pragma weak was used, mark the decl weak now. */
5510 if (current_scope == global_scope)
5511 maybe_apply_pragma_weak (decl1);
5513 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5514 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5519 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5520 != integer_type_node)
5521 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5523 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5524 args = TREE_CHAIN (args))
5526 tree type = args ? TREE_VALUE (args) : 0;
5528 if (type == void_type_node)
5535 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5536 pedwarn ("%Jfirst argument of '%D' should be `int'",
5541 if (TREE_CODE (type) != POINTER_TYPE
5542 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5543 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5545 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5550 if (TREE_CODE (type) != POINTER_TYPE
5551 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5552 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5554 pedwarn ("%Jthird argument of '%D' should probably be "
5555 "'char **'", decl1, decl1);
5560 /* It is intentional that this message does not mention the third
5561 argument because it's only mentioned in an appendix of the
5563 if (argct > 0 && (argct < 2 || argct > 3))
5564 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5566 if (! TREE_PUBLIC (decl1))
5567 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5570 /* Record the decl so that the function name is defined.
5571 If we already have a decl for this name, and it is a FUNCTION_DECL,
5572 use the old decl. */
5574 current_function_decl = pushdecl (decl1);
5577 declare_parm_level ();
5579 make_decl_rtl (current_function_decl, NULL);
5581 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5582 /* Promote the value to int before returning it. */
5583 if (c_promoting_integer_type_p (restype))
5585 /* It retains unsignedness if not really getting wider. */
5586 if (TREE_UNSIGNED (restype)
5587 && (TYPE_PRECISION (restype)
5588 == TYPE_PRECISION (integer_type_node)))
5589 restype = unsigned_type_node;
5591 restype = integer_type_node;
5593 DECL_RESULT (current_function_decl)
5594 = build_decl (RESULT_DECL, NULL_TREE, restype);
5596 /* If this fcn was already referenced via a block-scope `extern' decl
5597 (or an implicit decl), propagate certain information about the usage. */
5598 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5599 TREE_ADDRESSABLE (current_function_decl) = 1;
5601 immediate_size_expand = old_immediate_size_expand;
5603 start_fname_decls ();
5608 /* Subroutine of store_parm_decls which handles new-style function
5609 definitions (prototype format). The parms already have decls, so we
5610 need only record them as in effect and complain if any redundant
5611 old-style parm decls were written. */
5613 store_parm_decls_newstyle (void)
5616 tree fndecl = current_function_decl;
5617 tree parms = current_function_parms;
5618 tree tags = current_function_parm_tags;
5619 tree others = current_function_parm_others;
5621 if (current_scope->parms || current_scope->names || current_scope->tags)
5623 error ("%Jold-style parameter declarations in prototyped "
5624 "function definition", fndecl);
5626 /* Get rid of the old-style declarations. */
5631 /* Now make all the parameter declarations visible in the function body.
5632 We can bypass most of the grunt work of pushdecl. */
5633 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5635 DECL_CONTEXT (decl) = current_function_decl;
5636 if (DECL_NAME (decl) == 0)
5637 error ("%Jparameter name omitted", decl);
5640 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5641 current_scope->shadowed
5642 = tree_cons (DECL_NAME (decl),
5643 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5644 current_scope->shadowed);
5645 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5648 current_scope->parms = parms;
5649 current_scope->parms_last = last;
5651 /* Record the parameter list in the function declaration. */
5652 DECL_ARGUMENTS (fndecl) = parms;
5654 /* Now make all the ancillary declarations visible, likewise. */
5655 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5657 DECL_CONTEXT (decl) = current_function_decl;
5658 if (DECL_NAME (decl)
5659 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5661 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5662 current_scope->shadowed
5663 = tree_cons (DECL_NAME (decl),
5664 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5665 current_scope->shadowed);
5666 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5669 current_scope->names = others;
5670 current_scope->names_last = last;
5672 /* And all the tag declarations. */
5673 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5674 if (TREE_PURPOSE (decl))
5676 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5677 current_scope->shadowed_tags
5678 = tree_cons (TREE_PURPOSE (decl),
5679 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5680 current_scope->shadowed_tags);
5681 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5683 current_scope->tags = tags;
5686 /* Subroutine of store_parm_decls which handles old-style function
5687 definitions (separate parameter list and declarations). */
5690 store_parm_decls_oldstyle (void)
5692 tree parm, decl, last;
5693 tree fndecl = current_function_decl;
5695 /* This is the identifier list from the function declarator. */
5696 tree parmids = current_function_parms;
5698 /* We use DECL_WEAK as a flag to show which parameters have been
5699 seen already, since it is not used on PARM_DECL. */
5700 #ifdef ENABLE_CHECKING
5701 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5702 if (DECL_WEAK (parm))
5706 /* Match each formal parameter name with its declaration. Save each
5707 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5708 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5710 if (TREE_VALUE (parm) == 0)
5712 error ("%Jparameter name missing from parameter list", fndecl);
5713 TREE_PURPOSE (parm) = 0;
5717 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5718 if (decl && DECL_CONTEXT (decl) == fndecl)
5720 /* If we got something other than a PARM_DECL it is an error. */
5721 if (TREE_CODE (decl) != PARM_DECL)
5722 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5723 /* If the declaration is already marked, we have a duplicate
5724 name. Complain and ignore the duplicate. */
5725 else if (DECL_WEAK (decl))
5727 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5728 TREE_PURPOSE (parm) = 0;
5731 /* If the declaration says "void", complain and turn it into
5733 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5735 error ("%Jparameter \"%D\" declared void", decl, decl);
5736 TREE_TYPE (decl) = integer_type_node;
5737 DECL_ARG_TYPE (decl) = integer_type_node;
5738 layout_decl (decl, 0);
5741 /* If no declaration found, default to int. */
5744 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5745 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5746 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5750 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5751 else if (extra_warnings)
5752 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5755 TREE_PURPOSE (parm) = decl;
5756 DECL_WEAK (decl) = 1;
5759 /* Now examine the parms chain for incomplete declarations
5760 and declarations with no corresponding names. */
5762 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5764 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5766 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5767 TREE_TYPE (parm) = error_mark_node;
5770 if (! DECL_WEAK (parm))
5772 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5775 /* Pretend the parameter was not missing.
5776 This gets us to a standard state and minimizes
5777 further error messages. */
5778 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5782 /* Chain the declarations together in the order of the list of
5783 names. Store that chain in the function decl, replacing the
5784 list of names. Update the current scope to match. */
5785 DECL_ARGUMENTS (fndecl) = 0;
5787 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5788 if (TREE_PURPOSE (parm))
5790 if (parm && TREE_PURPOSE (parm))
5792 last = TREE_PURPOSE (parm);
5793 DECL_ARGUMENTS (fndecl) = last;
5794 current_scope->parms = last;
5795 DECL_WEAK (last) = 0;
5797 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5798 if (TREE_PURPOSE (parm))
5800 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5801 last = TREE_PURPOSE (parm);
5802 DECL_WEAK (last) = 0;
5804 current_scope->parms_last = last;
5805 TREE_CHAIN (last) = 0;
5808 /* If there was a previous prototype,
5809 set the DECL_ARG_TYPE of each argument according to
5810 the type previously specified, and report any mismatches. */
5812 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5815 for (parm = DECL_ARGUMENTS (fndecl),
5816 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5817 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5818 != void_type_node));
5819 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5821 if (parm == 0 || type == 0
5822 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5824 error ("number of arguments doesn't match prototype");
5825 error ("%Hprototype declaration",
5826 ¤t_function_prototype_locus);
5829 /* Type for passing arg must be consistent with that
5830 declared for the arg. ISO C says we take the unqualified
5831 type for parameters declared with qualified type. */
5832 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5833 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5836 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5837 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5839 /* Adjust argument to match prototype. E.g. a previous
5840 `int foo(float);' prototype causes
5841 `int foo(x) float x; {...}' to be treated like
5842 `int foo(float x) {...}'. This is particularly
5843 useful for argument types like uid_t. */
5844 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5846 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5847 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5848 && TYPE_PRECISION (TREE_TYPE (parm))
5849 < TYPE_PRECISION (integer_type_node))
5850 DECL_ARG_TYPE (parm) = integer_type_node;
5854 pedwarn ("promoted argument \"%D\" "
5855 "doesn't match prototype", parm);
5856 pedwarn ("%Hprototype declaration",
5857 ¤t_function_prototype_locus);
5862 error ("argument \"%D\" doesn't match prototype", parm);
5863 error ("%Hprototype declaration",
5864 ¤t_function_prototype_locus);
5868 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5871 /* Otherwise, create a prototype that would match. */
5875 tree actual = 0, last = 0, type;
5877 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5879 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5881 TREE_CHAIN (last) = type;
5886 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5888 TREE_CHAIN (last) = type;
5892 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5893 of the type of this function, but we need to avoid having this
5894 affect the types of other similarly-typed functions, so we must
5895 first force the generation of an identical (but separate) type
5896 node for the relevant function type. The new node we create
5897 will be a variant of the main variant of the original function
5900 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5902 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5906 /* Store the parameter declarations into the current function declaration.
5907 This is called after parsing the parameter declarations, before
5908 digesting the body of the function.
5910 For an old-style definition, construct a prototype out of the old-style
5911 parameter declarations and inject it into the function's type. */
5914 store_parm_decls (void)
5916 tree fndecl = current_function_decl;
5918 /* The function containing FNDECL, if any. */
5919 tree context = decl_function_context (fndecl);
5921 /* True if this definition is written with a prototype. */
5922 bool prototype = (current_function_parms
5923 && TREE_CODE (current_function_parms) != TREE_LIST);
5926 store_parm_decls_newstyle ();
5928 store_parm_decls_oldstyle ();
5930 /* The next call to pushlevel will be a function body. */
5932 next_is_function_body = true;
5934 /* Write a record describing this function definition to the prototypes
5935 file (if requested). */
5937 gen_aux_info_record (fndecl, 1, 0, prototype);
5939 /* Initialize the RTL code for the function. */
5940 allocate_struct_function (fndecl);
5942 /* Begin the statement tree for this function. */
5943 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5945 /* If this is a nested function, save away the sizes of any
5946 variable-size types so that we can expand them when generating
5952 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5953 = nreverse (get_pending_sizes ());
5954 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5957 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
5960 /* This function is being processed in whole-function mode. */
5961 cfun->x_whole_function_mode_p = 1;
5963 /* Even though we're inside a function body, we still don't want to
5964 call expand_expr to calculate the size of a variable-sized array.
5965 We haven't necessarily assigned RTL to all variables yet, so it's
5966 not safe to try to expand expressions involving them. */
5967 immediate_size_expand = 0;
5968 cfun->x_dont_save_pending_sizes_p = 1;
5971 /* Finish up a function declaration and compile that function
5972 all the way to assembler language output. The free the storage
5973 for the function definition.
5975 This is called after parsing the body of the function definition. */
5978 finish_function (void)
5980 tree fndecl = current_function_decl;
5982 /* When a function declaration is totally empty, e.g.
5984 (the argument list is irrelevant) the compstmt rule will not
5985 bother calling pushlevel/poplevel, which means we get here with
5986 the scope stack out of sync. Detect this situation by noticing
5987 that current_scope is still as store_parm_decls left it, and do
5988 a dummy push/pop to get back to consistency.
5989 Note that the call to pushlevel does not actually push another
5990 scope - see there for details. */
5992 if (current_scope->parm_flag && next_is_function_body)
5998 if (TREE_CODE (fndecl) == FUNCTION_DECL
5999 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6001 tree args = DECL_ARGUMENTS (fndecl);
6002 for (; args; args = TREE_CHAIN (args))
6004 tree type = TREE_TYPE (args);
6005 if (INTEGRAL_TYPE_P (type)
6006 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6007 DECL_ARG_TYPE (args) = integer_type_node;
6011 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6012 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6014 /* Must mark the RESULT_DECL as being in this function. */
6016 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6017 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6019 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6021 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6022 != integer_type_node)
6024 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6025 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6027 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6031 #ifdef DEFAULT_MAIN_RETURN
6032 /* Make it so that `main' always returns success by default. */
6033 DEFAULT_MAIN_RETURN;
6036 c_expand_return (integer_zero_node);
6041 finish_fname_decls ();
6043 /* Tie off the statement tree for this function. */
6044 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6046 /* Complain if there's just no return statement. */
6047 if (warn_return_type
6048 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6049 && !current_function_returns_value && !current_function_returns_null
6050 /* Don't complain if we abort. */
6051 && !current_function_returns_abnormally
6052 /* Don't warn for main(). */
6053 && !MAIN_NAME_P (DECL_NAME (fndecl))
6054 /* Or if they didn't actually specify a return type. */
6055 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6056 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6057 inline function, as we might never be compiled separately. */
6058 && DECL_INLINE (fndecl))
6059 warning ("no return statement in function returning non-void");
6061 /* With just -Wextra, complain only if function returns both with
6062 and without a value. */
6064 && current_function_returns_value
6065 && current_function_returns_null)
6066 warning ("this function may return with or without a value");
6068 /* We're leaving the context of this function, so zap cfun. It's still in
6069 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6072 /* ??? Objc emits functions after finalizing the compilation unit.
6073 This should be cleaned up later and this conditional removed. */
6074 if (!cgraph_global_info_ready)
6075 cgraph_finalize_function (fndecl, false);
6077 c_expand_body (fndecl);
6078 current_function_decl = NULL;
6081 /* Generate the RTL for a deferred function FNDECL. */
6084 c_expand_deferred_function (tree fndecl)
6086 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6087 function was deferred, e.g. in duplicate_decls. */
6088 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6090 if (flag_inline_trees)
6092 timevar_push (TV_INTEGRATION);
6093 optimize_inline_calls (fndecl);
6094 timevar_pop (TV_INTEGRATION);
6096 c_expand_body (fndecl);
6097 current_function_decl = NULL;
6101 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6102 then we are already in the process of generating RTL for another
6106 c_expand_body_1 (tree fndecl, int nested_p)
6110 /* Make sure that we will evaluate variable-sized types involved
6111 in our function's type. */
6112 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6114 /* Squirrel away our current state. */
6115 push_function_context ();
6118 tree_rest_of_compilation (fndecl, nested_p);
6121 /* Return to the enclosing function. */
6122 pop_function_context ();
6124 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6126 if (targetm.have_ctors_dtors)
6127 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6128 DEFAULT_INIT_PRIORITY);
6130 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6133 if (DECL_STATIC_DESTRUCTOR (fndecl))
6135 if (targetm.have_ctors_dtors)
6136 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6137 DEFAULT_INIT_PRIORITY);
6139 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6143 /* Like c_expand_body_1 but only for unnested functions. */
6146 c_expand_body (tree fndecl)
6149 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6150 c_expand_body_1 (fndecl, 0);
6153 /* Check the declarations given in a for-loop for satisfying the C99
6156 check_for_loop_decls (void)
6162 /* If we get here, declarations have been used in a for loop without
6163 the C99 for loop scope. This doesn't make much sense, so don't
6165 error ("'for' loop initial declaration used outside C99 mode");
6168 /* C99 subclause 6.8.5 paragraph 3:
6170 [#3] The declaration part of a for statement shall only
6171 declare identifiers for objects having storage class auto or
6174 It isn't clear whether, in this sentence, "identifiers" binds to
6175 "shall only declare" or to "objects" - that is, whether all identifiers
6176 declared must be identifiers for objects, or whether the restriction
6177 only applies to those that are. (A question on this in comp.std.c
6178 in November 2000 received no answer.) We implement the strictest
6179 interpretation, to avoid creating an extension which later causes
6182 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6184 if (TREE_PURPOSE (t) != 0)
6186 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6188 if (code == RECORD_TYPE)
6189 error ("'struct %s' declared in 'for' loop initial declaration",
6190 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6191 else if (code == UNION_TYPE)
6192 error ("'union %s' declared in 'for' loop initial declaration",
6193 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6195 error ("'enum %s' declared in 'for' loop initial declaration",
6196 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6200 for (t = getdecls (); t; t = TREE_CHAIN (t))
6202 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6203 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6204 "initial declaration", t, t);
6205 else if (TREE_STATIC (t))
6206 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6207 "initial declaration", t, t);
6208 else if (DECL_EXTERNAL (t))
6209 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6210 "initial declaration", t, t);
6214 /* Save and reinitialize the variables
6215 used during compilation of a C function. */
6218 c_push_function_context (struct function *f)
6220 struct language_function *p;
6221 p = ggc_alloc (sizeof (struct language_function));
6224 p->base.x_stmt_tree = c_stmt_tree;
6225 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6226 p->x_in_iteration_stmt = c_in_iteration_stmt;
6227 p->x_in_case_stmt = c_in_case_stmt;
6228 p->returns_value = current_function_returns_value;
6229 p->returns_null = current_function_returns_null;
6230 p->returns_abnormally = current_function_returns_abnormally;
6231 p->warn_about_return_type = warn_about_return_type;
6232 p->extern_inline = current_extern_inline;
6235 /* Restore the variables used during compilation of a C function. */
6238 c_pop_function_context (struct function *f)
6240 struct language_function *p = f->language;
6242 if (DECL_SAVED_INSNS (current_function_decl) == 0
6243 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6245 /* Stop pointing to the local nodes about to be freed. */
6246 /* But DECL_INITIAL must remain nonzero so we know this
6247 was an actual function definition. */
6248 DECL_INITIAL (current_function_decl) = error_mark_node;
6249 DECL_ARGUMENTS (current_function_decl) = 0;
6252 c_stmt_tree = p->base.x_stmt_tree;
6253 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6254 c_in_iteration_stmt = p->x_in_iteration_stmt;
6255 c_in_case_stmt = p->x_in_case_stmt;
6256 current_function_returns_value = p->returns_value;
6257 current_function_returns_null = p->returns_null;
6258 current_function_returns_abnormally = p->returns_abnormally;
6259 warn_about_return_type = p->warn_about_return_type;
6260 current_extern_inline = p->extern_inline;
6265 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6268 c_dup_lang_specific_decl (tree decl)
6270 struct lang_decl *ld;
6272 if (!DECL_LANG_SPECIFIC (decl))
6275 ld = ggc_alloc (sizeof (struct lang_decl));
6276 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6277 DECL_LANG_SPECIFIC (decl) = ld;
6280 /* The functions below are required for functionality of doing
6281 function at once processing in the C front end. Currently these
6282 functions are not called from anywhere in the C front end, but as
6283 these changes continue, that will change. */
6285 /* Returns nonzero if the current statement is a full expression,
6286 i.e. temporaries created during that statement should be destroyed
6287 at the end of the statement. */
6290 stmts_are_full_exprs_p (void)
6295 /* Returns the stmt_tree (if any) to which statements are currently
6296 being added. If there is no active statement-tree, NULL is
6300 current_stmt_tree (void)
6302 return &c_stmt_tree;
6305 /* Returns the stack of SCOPE_STMTs for the current function. */
6308 current_scope_stmt_stack (void)
6310 return &c_scope_stmt_stack;
6313 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6317 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6322 /* Dummy function in place of callback used by C++. */
6325 extract_interface_info (void)
6329 /* Return a new COMPOUND_STMT, after adding it to the current
6333 c_begin_compound_stmt (void)
6337 /* Create the COMPOUND_STMT. */
6338 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6343 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6347 c_expand_decl_stmt (tree t)
6349 tree decl = DECL_STMT_DECL (t);
6351 /* Expand nested functions. */
6352 if (TREE_CODE (decl) == FUNCTION_DECL
6353 && DECL_CONTEXT (decl) == current_function_decl
6354 && DECL_SAVED_TREE (decl))
6355 c_expand_body_1 (decl, 1);
6358 /* Return the global value of T as a symbol. */
6361 identifier_global_value (tree t)
6363 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6364 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6367 /* Shadowed by something else; find the true global value. */
6368 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6369 if (DECL_NAME (decl) == t)
6372 /* Only local values for this decl. */
6376 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6377 otherwise the name is found in ridpointers from RID_INDEX. */
6380 record_builtin_type (enum rid rid_index, const char *name, tree type)
6384 id = ridpointers[(int) rid_index];
6386 id = get_identifier (name);
6387 pushdecl (build_decl (TYPE_DECL, id, type));
6390 /* Build the void_list_node (void_type_node having been created). */
6392 build_void_list_node (void)
6394 tree t = build_tree_list (NULL_TREE, void_type_node);
6398 /* Return something to represent absolute declarators containing a *.
6399 TARGET is the absolute declarator that the * contains.
6400 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6401 to apply to the pointer type, represented as identifiers, possible mixed
6404 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6405 if attributes are present) and whose type is the modifier list. */
6408 make_pointer_declarator (tree type_quals_attrs, tree target)
6411 tree itarget = target;
6412 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6413 if (attrs != NULL_TREE)
6414 itarget = tree_cons (attrs, target, NULL_TREE);
6415 return build1 (INDIRECT_REF, quals, itarget);
6418 /* A wrapper around lhd_set_decl_assembler_name that gives static
6419 variables their C names if they are at file scope and only one
6420 translation unit is being compiled, for backwards compatibility
6421 with certain bizarre assembler hacks (like crtstuff.c). */
6424 c_static_assembler_name (tree decl)
6426 if (num_in_fnames == 1
6427 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6428 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6429 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6431 lhd_set_decl_assembler_name (decl);
6434 /* Hash and equality functions for link_hash_table: key off
6435 DECL_ASSEMBLER_NAME. */
6438 link_hash_hash (const void *x_p)
6441 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6445 link_hash_eq (const void *x1_p, const void *x2_p)
6447 tree x1 = (tree)x1_p;
6448 tree x2 = (tree)x2_p;
6449 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6452 /* Propagate information between definitions and uses between multiple
6453 translation units in TU_LIST based on linkage rules. */
6456 merge_translation_unit_decls (void)
6458 const tree tu_list = current_file_decl;
6461 htab_t link_hash_table;
6464 /* Create the BLOCK that poplevel would have created, but don't
6465 actually call poplevel since that's expensive. */
6466 block = make_node (BLOCK);
6467 BLOCK_VARS (block) = current_scope->names;
6468 TREE_USED (block) = 1;
6469 DECL_INITIAL (current_file_decl) = block;
6471 /* If only one translation unit seen, no copying necessary. */
6472 if (TREE_CHAIN (tu_list) == NULL_TREE)
6475 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6477 /* Enter any actual definitions into the hash table. */
6478 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6479 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6480 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6483 slot = htab_find_slot (link_hash_table, decl, INSERT);
6485 /* If we've already got a definition, work out which one is
6486 the real one, put it into the hash table, and make the
6487 other one DECL_EXTERNAL. This is important to avoid
6488 putting out two definitions of the same symbol in the
6492 tree old_decl = (tree) *slot;
6494 /* If this is weak or common or whatever, suppress it
6495 in favor of the other definition. */
6496 if (DECL_WEAK (decl))
6497 DECL_EXTERNAL (decl) = 1;
6498 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6499 DECL_EXTERNAL (old_decl) = 1;
6500 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6501 DECL_EXTERNAL (decl) = 1;
6502 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6503 DECL_EXTERNAL (old_decl) = 1;
6505 if (DECL_EXTERNAL (decl))
6507 DECL_INITIAL (decl) = NULL_TREE;
6508 DECL_COMMON (decl) = 0;
6509 DECL_ONE_ONLY (decl) = 0;
6510 DECL_WEAK (decl) = 0;
6512 else if (DECL_EXTERNAL (old_decl))
6514 DECL_INITIAL (old_decl) = NULL_TREE;
6515 DECL_COMMON (old_decl) = 0;
6516 DECL_ONE_ONLY (old_decl) = 0;
6517 DECL_WEAK (old_decl) = 0;
6522 error ("%Jredefinition of global '%D'", decl, decl);
6523 error ("%J'%D' previously defined here", old_decl, old_decl);
6530 /* Now insert the desired information from all the definitions
6531 into any plain declarations. */
6532 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6533 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6534 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6537 global_decl = htab_find (link_hash_table, decl);
6542 /* Print any appropriate error messages, and partially merge
6544 (void) duplicate_decls (decl, global_decl);
6547 htab_delete (link_hash_table);
6550 /* Perform final processing on file-scope data. */
6553 c_write_global_declarations(void)
6557 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6559 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6560 int len = list_length (globals);
6561 tree *vec = xmalloc (sizeof (tree) * len);
6565 /* Process the decls in the order they were written. */
6567 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6570 wrapup_global_declarations (vec, len);
6572 check_global_declarations (vec, len);
6579 /* Reset the parser's state in preparation for a new file. */
6582 c_reset_state (void)
6585 tree file_scope_decl;
6587 /* Pop the global scope. */
6588 if (current_scope != global_scope)
6589 current_scope = global_scope;
6590 file_scope_decl = current_file_decl;
6591 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6592 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6593 truly_local_externals = NULL_TREE;
6595 /* Start a new global binding level. */
6597 global_scope = current_scope;
6598 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6599 TREE_CHAIN (current_file_decl) = file_scope_decl;
6601 /* Reintroduce the builtin declarations. */
6602 for (link = first_builtin_decl;
6603 link != TREE_CHAIN (last_builtin_decl);
6604 link = TREE_CHAIN (link))
6605 pushdecl (copy_node (link));
6608 #include "gt-c-decl.h"