1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
56 #include "tree-iterator.h"
57 #include "diagnostic.h"
58 #include "tree-dump.h"
63 #include "langhooks-def.h"
64 #include "pointer-set.h"
67 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
69 { NORMAL
, /* Ordinary declaration */
70 FUNCDEF
, /* Function definition */
71 PARM
, /* Declaration of parm before function body */
72 FIELD
, /* Declaration inside struct or union */
73 TYPENAME
}; /* Typename (inside cast or sizeof) */
75 /* States indicating how grokdeclarator() should handle declspecs marked
76 with __attribute__((deprecated)). An object declared as
77 __attribute__((deprecated)) suppresses warnings of uses of other
80 enum deprecated_states
{
86 /* Nonzero if we have seen an invalid cross reference
87 to a struct, union, or enum, but not yet printed the message. */
88 tree pending_invalid_xref
;
90 /* File and line to appear in the eventual error message. */
91 location_t pending_invalid_xref_location
;
93 /* True means we've initialized exception handling. */
94 bool c_eh_initialized_p
;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus
;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in
;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types
;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info
*current_function_arg_info
;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack
;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree
;
124 /* State saving variables. */
128 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
129 included in this invocation. Note that the current translation
130 unit is not included in this list. */
132 static GTY(()) tree all_translation_units
;
134 /* A list of decls to be made automatically visible in each file scope. */
135 static GTY(()) tree visible_builtins
;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value
;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null
;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a call to a noreturn function is seen. */
150 int current_function_returns_abnormally
;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type
;
157 /* Nonzero when the current toplevel function contains a declaration
158 of a nested function which is never defined. */
160 static bool undef_nested_function
;
162 /* True means global_bindings_p should return false even if the scope stack
163 says we are in file scope. */
164 bool c_override_global_bindings_to_false
;
167 /* Each c_binding structure describes one binding of an identifier to
168 a decl. All the decls in a scope - irrespective of namespace - are
169 chained together by the ->prev field, which (as the name implies)
170 runs in reverse order. All the decls in a given namespace bound to
171 a given identifier are chained by the ->shadowed field, which runs
172 from inner to outer scopes.
174 The ->decl field usually points to a DECL node, but there are two
175 exceptions. In the namespace of type tags, the bound entity is a
176 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
177 identifier is encountered, it is bound to error_mark_node to
178 suppress further errors about that identifier in the current
181 The ->type field stores the type of the declaration in this scope;
182 if NULL, the type is the type of the ->decl field. This is only of
183 relevance for objects with external or internal linkage which may
184 be redeclared in inner scopes, forming composite types that only
185 persist for the duration of those scopes. In the external scope,
186 this stores the composite of all the types declared for this
187 object, visible or not. The ->inner_comp field (used only at file
188 scope) stores whether an incomplete array type at file scope was
189 completed at an inner scope to an array size other than 1.
191 The depth field is copied from the scope structure that holds this
192 decl. It is used to preserve the proper ordering of the ->shadowed
193 field (see bind()) and also for a handful of special-case checks.
194 Finally, the invisible bit is true for a decl which should be
195 ignored for purposes of normal name lookup, and the nested bit is
196 true for a decl that's been bound a second time in an inner scope;
197 in all such cases, the binding in the outer scope will have its
198 invisible bit true. */
200 struct c_binding
GTY((chain_next ("%h.prev")))
202 tree decl
; /* the decl bound */
203 tree type
; /* the type in this scope */
204 tree id
; /* the identifier it's bound to */
205 struct c_binding
*prev
; /* the previous decl in this scope */
206 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
207 unsigned int depth
: 28; /* depth of this scope */
208 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct lang_identifier
GTY(())
239 struct c_common_identifier common_id
;
240 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
241 struct c_binding
*tag_binding
; /* struct/union/enum tags */
242 struct c_binding
*label_binding
; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
249 /* The resulting tree type. */
252 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
253 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))")))
255 union tree_node
GTY ((tag ("0"),
256 desc ("tree_node_structure (&%h)")))
258 struct lang_identifier
GTY ((tag ("1"))) identifier
;
261 /* Each c_scope structure describes the complete contents of one
262 scope. Four scopes are distinguished specially: the innermost or
263 current scope, the innermost function scope, the file scope (always
264 the second to outermost) and the outermost or external scope.
266 Most declarations are recorded in the current scope.
268 All normal label declarations are recorded in the innermost
269 function scope, as are bindings of undeclared identifiers to
270 error_mark_node. (GCC permits nested functions as an extension,
271 hence the 'innermost' qualifier.) Explicitly declared labels
272 (using the __label__ extension) appear in the current scope.
274 Being in the file scope (current_scope == file_scope) causes
275 special behavior in several places below. Also, under some
276 conditions the Objective-C front end records declarations in the
277 file scope even though that isn't the current scope.
279 All declarations with external linkage are recorded in the external
280 scope, even if they aren't visible there; this models the fact that
281 such declarations are visible to the entire program, and (with a
282 bit of cleverness, see pushdecl) allows diagnosis of some violations
283 of C99 6.2.2p7 and 6.2.7p2:
285 If, within the same translation unit, the same identifier appears
286 with both internal and external linkage, the behavior is
289 All declarations that refer to the same object or function shall
290 have compatible type; otherwise, the behavior is undefined.
292 Initially only the built-in declarations, which describe compiler
293 intrinsic functions plus a subset of the standard library, are in
296 The order of the blocks list matters, and it is frequently appended
297 to. To avoid having to walk all the way to the end of the list on
298 each insertion, or reverse the list later, we maintain a pointer to
299 the last list entry. (FIXME: It should be feasible to use a reversed
302 The bindings list is strictly in reverse order of declarations;
303 pop_scope relies on this. */
306 struct c_scope
GTY((chain_next ("%h.outer")))
308 /* The scope containing this one. */
309 struct c_scope
*outer
;
311 /* The next outermost function scope. */
312 struct c_scope
*outer_function
;
314 /* All bindings in this scope. */
315 struct c_binding
*bindings
;
317 /* For each scope (except the global one), a chain of BLOCK nodes
318 for all the scopes that were entered and exited one level down. */
322 /* The depth of this scope. Used to keep the ->shadowed chain of
323 bindings sorted innermost to outermost. */
324 unsigned int depth
: 28;
326 /* True if we are currently filling this scope with parameter
328 BOOL_BITFIELD parm_flag
: 1;
330 /* True if we saw [*] in this scope. Used to give an error messages
331 if these appears in a function definition. */
332 BOOL_BITFIELD had_vla_unspec
: 1;
334 /* True if we already complained about forward parameter decls
335 in this scope. This prevents double warnings on
336 foo (int a; int b; ...) */
337 BOOL_BITFIELD warned_forward_parm_decls
: 1;
339 /* True if this is the outermost block scope of a function body.
340 This scope contains the parameters, the local variables declared
341 in the outermost block, and all the labels (except those in
342 nested functions, or declared at block scope with __label__). */
343 BOOL_BITFIELD function_body
: 1;
345 /* True means make a BLOCK for this scope no matter what. */
346 BOOL_BITFIELD keep
: 1;
349 /* The scope currently in effect. */
351 static GTY(()) struct c_scope
*current_scope
;
353 /* The innermost function scope. Ordinary (not explicitly declared)
354 labels, bindings to error_mark_node, and the lazily-created
355 bindings of __func__ and its friends get this scope. */
357 static GTY(()) struct c_scope
*current_function_scope
;
359 /* The C file scope. This is reset for each input translation unit. */
361 static GTY(()) struct c_scope
*file_scope
;
363 /* The outermost scope. This is used for all declarations with
364 external linkage, and only these, hence the name. */
366 static GTY(()) struct c_scope
*external_scope
;
368 /* A chain of c_scope structures awaiting reuse. */
370 static GTY((deletable
)) struct c_scope
*scope_freelist
;
372 /* A chain of c_binding structures awaiting reuse. */
374 static GTY((deletable
)) struct c_binding
*binding_freelist
;
376 /* Append VAR to LIST in scope SCOPE. */
377 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
378 struct c_scope *s_ = (scope); \
380 if (s_->list##_last) \
381 BLOCK_CHAIN (s_->list##_last) = d_; \
384 s_->list##_last = d_; \
387 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
388 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
389 struct c_scope *t_ = (tscope); \
390 struct c_scope *f_ = (fscope); \
392 BLOCK_CHAIN (t_->to##_last) = f_->from; \
395 t_->to##_last = f_->from##_last; \
398 /* True means unconditionally make a BLOCK for the next scope pushed. */
400 static bool keep_next_level_flag
;
402 /* True means the next call to push_scope will be the outermost scope
403 of a function body, so do not push a new scope, merely cease
404 expecting parameter decls. */
406 static bool next_is_function_body
;
408 /* Forward declarations. */
409 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
410 static tree
c_make_fname_decl (tree
, int);
411 static tree
grokdeclarator (const struct c_declarator
*,
412 struct c_declspecs
*,
413 enum decl_context
, bool, tree
*, tree
*,
414 enum deprecated_states
);
415 static tree
grokparms (struct c_arg_info
*, bool);
416 static void layout_array_type (tree
);
418 /* T is a statement. Add it to the statement-tree. This is the
419 C/ObjC version--C++ has a slightly different version of this
425 enum tree_code code
= TREE_CODE (t
);
427 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
429 if (!EXPR_HAS_LOCATION (t
))
430 SET_EXPR_LOCATION (t
, input_location
);
433 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
434 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
436 /* Add T to the statement-tree. Non-side-effect statements need to be
437 recorded during statement expressions. */
438 append_to_statement_list_force (t
, &cur_stmt_list
);
445 c_print_identifier (FILE *file
, tree node
, int indent
)
447 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
448 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
449 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
450 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
452 tree rid
= ridpointers
[C_RID_CODE (node
)];
453 indent_to (file
, indent
+ 4);
454 fprintf (file
, "rid %p \"%s\"",
455 (void *) rid
, IDENTIFIER_POINTER (rid
));
459 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
460 which may be any of several kinds of DECL or TYPE or error_mark_node,
461 in the scope SCOPE. */
463 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
, bool nested
)
465 struct c_binding
*b
, **here
;
467 if (binding_freelist
)
469 b
= binding_freelist
;
470 binding_freelist
= b
->prev
;
473 b
= GGC_NEW (struct c_binding
);
478 b
->depth
= scope
->depth
;
479 b
->invisible
= invisible
;
485 b
->prev
= scope
->bindings
;
491 switch (TREE_CODE (decl
))
493 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
496 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
502 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
508 /* Locate the appropriate place in the chain of shadowed decls
509 to insert this binding. Normally, scope == current_scope and
510 this does nothing. */
511 while (*here
&& (*here
)->depth
> scope
->depth
)
512 here
= &(*here
)->shadowed
;
518 /* Clear the binding structure B, stick it on the binding_freelist,
519 and return the former value of b->prev. This is used by pop_scope
520 and get_parm_info to iterate destructively over all the bindings
521 from a given scope. */
522 static struct c_binding
*
523 free_binding_and_advance (struct c_binding
*b
)
525 struct c_binding
*prev
= b
->prev
;
527 memset (b
, 0, sizeof (struct c_binding
));
528 b
->prev
= binding_freelist
;
529 binding_freelist
= b
;
535 /* Hook called at end of compilation to assume 1 elt
536 for a file-scope tentative array defn that wasn't complete before. */
539 c_finish_incomplete_decl (tree decl
)
541 if (TREE_CODE (decl
) == VAR_DECL
)
543 tree type
= TREE_TYPE (decl
);
544 if (type
!= error_mark_node
545 && TREE_CODE (type
) == ARRAY_TYPE
546 && !DECL_EXTERNAL (decl
)
547 && TYPE_DOMAIN (type
) == 0)
549 warning (0, "array %q+D assumed to have one element", decl
);
551 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
553 layout_decl (decl
, 0);
558 /* The Objective-C front-end often needs to determine the current scope. */
561 objc_get_current_scope (void)
563 return current_scope
;
566 /* The following function is used only by Objective-C. It needs to live here
567 because it accesses the innards of c_scope. */
570 objc_mark_locals_volatile (void *enclosing_blk
)
572 struct c_scope
*scope
;
575 for (scope
= current_scope
;
576 scope
&& scope
!= enclosing_blk
;
577 scope
= scope
->outer
)
579 for (b
= scope
->bindings
; b
; b
= b
->prev
)
580 objc_volatilize_decl (b
->decl
);
582 /* Do not climb up past the current function. */
583 if (scope
->function_body
)
588 /* Nonzero if we are currently in file scope. */
591 global_bindings_p (void)
593 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
597 keep_next_level (void)
599 keep_next_level_flag
= true;
602 /* Identify this scope as currently being filled with parameters. */
605 declare_parm_level (void)
607 current_scope
->parm_flag
= true;
613 if (next_is_function_body
)
615 /* This is the transition from the parameters to the top level
616 of the function body. These are the same scope
617 (C99 6.2.1p4,6) so we do not push another scope structure.
618 next_is_function_body is set only by store_parm_decls, which
619 in turn is called when and only when we are about to
620 encounter the opening curly brace for the function body.
622 The outermost block of a function always gets a BLOCK node,
623 because the debugging output routines expect that each
624 function has at least one BLOCK. */
625 current_scope
->parm_flag
= false;
626 current_scope
->function_body
= true;
627 current_scope
->keep
= true;
628 current_scope
->outer_function
= current_function_scope
;
629 current_function_scope
= current_scope
;
631 keep_next_level_flag
= false;
632 next_is_function_body
= false;
636 struct c_scope
*scope
;
639 scope
= scope_freelist
;
640 scope_freelist
= scope
->outer
;
643 scope
= GGC_CNEW (struct c_scope
);
645 scope
->keep
= keep_next_level_flag
;
646 scope
->outer
= current_scope
;
647 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
649 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
651 if (current_scope
&& scope
->depth
== 0)
654 sorry ("GCC supports only %u nested scopes", scope
->depth
);
657 current_scope
= scope
;
658 keep_next_level_flag
= false;
662 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
665 set_type_context (tree type
, tree context
)
667 for (type
= TYPE_MAIN_VARIANT (type
); type
;
668 type
= TYPE_NEXT_VARIANT (type
))
669 TYPE_CONTEXT (type
) = context
;
672 /* Exit a scope. Restore the state of the identifier-decl mappings
673 that were in effect when this scope was entered. Return a BLOCK
674 node containing all the DECLs in this scope that are of interest
675 to debug info generation. */
680 struct c_scope
*scope
= current_scope
;
681 tree block
, context
, p
;
684 bool functionbody
= scope
->function_body
;
685 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
687 c_end_vm_scope (scope
->depth
);
689 /* If appropriate, create a BLOCK to record the decls for the life
694 block
= make_node (BLOCK
);
695 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
696 TREE_USED (block
) = 1;
698 /* In each subblock, record that this is its superior. */
699 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
700 BLOCK_SUPERCONTEXT (p
) = block
;
702 BLOCK_VARS (block
) = 0;
705 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
706 scope must be set so that they point to the appropriate
707 construct, i.e. either to the current FUNCTION_DECL node, or
708 else to the BLOCK node we just constructed.
710 Note that for tagged types whose scope is just the formal
711 parameter list for some function type specification, we can't
712 properly set their TYPE_CONTEXTs here, because we don't have a
713 pointer to the appropriate FUNCTION_TYPE node readily available
714 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
715 type nodes get set in `grokdeclarator' as soon as we have created
716 the FUNCTION_TYPE node which will represent the "scope" for these
717 "parameter list local" tagged types. */
718 if (scope
->function_body
)
719 context
= current_function_decl
;
720 else if (scope
== file_scope
)
722 tree file_decl
= build_decl (TRANSLATION_UNIT_DECL
, 0, 0);
723 TREE_CHAIN (file_decl
) = all_translation_units
;
724 all_translation_units
= file_decl
;
730 /* Clear all bindings in this scope. */
731 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
734 switch (TREE_CODE (p
))
737 /* Warnings for unused labels, errors for undefined labels. */
738 if (TREE_USED (p
) && !DECL_INITIAL (p
))
740 error ("label %q+D used but not defined", p
);
741 DECL_INITIAL (p
) = error_mark_node
;
744 warn_for_unused_label (p
);
746 /* Labels go in BLOCK_VARS. */
747 TREE_CHAIN (p
) = BLOCK_VARS (block
);
748 BLOCK_VARS (block
) = p
;
749 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
750 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
756 set_type_context (p
, context
);
758 /* Types may not have tag-names, in which case the type
759 appears in the bindings list with b->id NULL. */
762 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
763 I_TAG_BINDING (b
->id
) = b
->shadowed
;
768 /* Propagate TREE_ADDRESSABLE from nested functions to their
769 containing functions. */
770 if (!TREE_ASM_WRITTEN (p
)
771 && DECL_INITIAL (p
) != 0
772 && TREE_ADDRESSABLE (p
)
773 && DECL_ABSTRACT_ORIGIN (p
) != 0
774 && DECL_ABSTRACT_ORIGIN (p
) != p
)
775 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
776 if (!DECL_EXTERNAL (p
)
778 && scope
!= file_scope
779 && scope
!= external_scope
)
781 error ("nested function %q+D declared but never defined", p
);
782 undef_nested_function
= true;
784 /* C99 6.7.4p6: "a function with external linkage... declared
785 with an inline function specifier ... shall also be defined in the
786 same translation unit." */
787 else if (DECL_DECLARED_INLINE_P (p
)
790 && !flag_gnu89_inline
)
791 pedwarn (input_location
, 0, "inline function %q+D declared but never defined", p
);
796 /* Warnings for unused variables. */
798 && !TREE_NO_WARNING (p
)
799 && !DECL_IN_SYSTEM_HEADER (p
)
801 && !DECL_ARTIFICIAL (p
)
802 && scope
!= file_scope
803 && scope
!= external_scope
)
804 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
808 error ("type of array %q+D completed incompatibly with"
809 " implicit initialization", p
);
816 /* All of these go in BLOCK_VARS, but only if this is the
817 binding in the home scope. */
820 TREE_CHAIN (p
) = BLOCK_VARS (block
);
821 BLOCK_VARS (block
) = p
;
823 /* If this is the file scope, and we are processing more
824 than one translation unit in this compilation, set
825 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
826 This makes same_translation_unit_p work, and causes
827 static declarations to be given disambiguating suffixes. */
828 if (scope
== file_scope
&& num_in_fnames
> 1)
830 DECL_CONTEXT (p
) = context
;
831 if (TREE_CODE (p
) == TYPE_DECL
)
832 set_type_context (TREE_TYPE (p
), context
);
836 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
837 already been put there by store_parm_decls. Unused-
838 parameter warnings are handled by function.c.
839 error_mark_node obviously does not go in BLOCK_VARS and
840 does not get unused-variable warnings. */
843 /* It is possible for a decl not to have a name. We get
844 here with b->id NULL in this case. */
847 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
848 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
849 if (b
->shadowed
&& b
->shadowed
->type
)
850 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->type
;
860 /* Dispose of the block that we just made inside some higher level. */
861 if ((scope
->function_body
|| scope
== file_scope
) && context
)
863 DECL_INITIAL (context
) = block
;
864 BLOCK_SUPERCONTEXT (block
) = context
;
866 else if (scope
->outer
)
869 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
870 /* If we did not make a block for the scope just exited, any
871 blocks made for inner scopes must be carried forward so they
872 will later become subblocks of something else. */
873 else if (scope
->blocks
)
874 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
877 /* Pop the current scope, and free the structure for reuse. */
878 current_scope
= scope
->outer
;
879 if (scope
->function_body
)
880 current_function_scope
= scope
->outer_function
;
882 memset (scope
, 0, sizeof (struct c_scope
));
883 scope
->outer
= scope_freelist
;
884 scope_freelist
= scope
;
890 push_file_scope (void)
898 file_scope
= current_scope
;
900 start_fname_decls ();
902 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
903 bind (DECL_NAME (decl
), decl
, file_scope
,
904 /*invisible=*/false, /*nested=*/true);
908 pop_file_scope (void)
910 /* In case there were missing closebraces, get us back to the global
912 while (current_scope
!= file_scope
)
915 /* __FUNCTION__ is defined at file scope (""). This
916 call may not be necessary as my tests indicate it
917 still works without it. */
918 finish_fname_decls ();
920 /* This is the point to write out a PCH if we're doing that.
921 In that case we do not want to do anything else. */
924 c_common_write_pch ();
928 /* Pop off the file scope and close this translation unit. */
932 maybe_apply_pending_pragma_weaks ();
933 cgraph_finalize_compilation_unit ();
937 /* Push a definition or a declaration of struct, union or enum tag "name".
938 "type" should be the type node.
939 We assume that the tag "name" is not already defined.
941 Note that the definition may really be just a forward reference.
942 In that case, the TYPE_SIZE will be zero. */
945 pushtag (tree name
, tree type
)
947 /* Record the identifier as the type's name if it has none. */
948 if (name
&& !TYPE_NAME (type
))
949 TYPE_NAME (type
) = name
;
950 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false);
952 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
953 tagged type we just added to the current scope. This fake
954 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
955 to output a representation of a tagged type, and it also gives
956 us a convenient place to record the "scope start" address for the
959 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
961 /* An approximation for now, so we can tell this is a function-scope tag.
962 This will be updated in pop_scope. */
963 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
966 /* Subroutine of compare_decls. Allow harmless mismatches in return
967 and argument types provided that the type modes match. This function
968 return a unified type given a suitable match, and 0 otherwise. */
971 match_builtin_function_types (tree newtype
, tree oldtype
)
973 tree newrettype
, oldrettype
;
974 tree newargs
, oldargs
;
975 tree trytype
, tryargs
;
977 /* Accept the return type of the new declaration if same modes. */
978 oldrettype
= TREE_TYPE (oldtype
);
979 newrettype
= TREE_TYPE (newtype
);
981 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
984 oldargs
= TYPE_ARG_TYPES (oldtype
);
985 newargs
= TYPE_ARG_TYPES (newtype
);
988 while (oldargs
|| newargs
)
992 || !TREE_VALUE (oldargs
)
993 || !TREE_VALUE (newargs
)
994 || TYPE_MODE (TREE_VALUE (oldargs
))
995 != TYPE_MODE (TREE_VALUE (newargs
)))
998 oldargs
= TREE_CHAIN (oldargs
);
999 newargs
= TREE_CHAIN (newargs
);
1002 trytype
= build_function_type (newrettype
, tryargs
);
1003 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1006 /* Subroutine of diagnose_mismatched_decls. Check for function type
1007 mismatch involving an empty arglist vs a nonempty one and give clearer
1010 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1011 tree newtype
, tree oldtype
)
1015 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1016 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1017 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1019 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1022 t
= TYPE_ARG_TYPES (oldtype
);
1024 t
= TYPE_ARG_TYPES (newtype
);
1025 for (; t
; t
= TREE_CHAIN (t
))
1027 tree type
= TREE_VALUE (t
);
1029 if (TREE_CHAIN (t
) == 0
1030 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1032 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1033 "an empty parameter name list declaration");
1037 if (c_type_promotes_to (type
) != type
)
1039 inform (input_location
, "an argument type that has a default promotion can%'t match "
1040 "an empty parameter name list declaration");
1046 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1047 old-style function definition, NEWDECL is a prototype declaration.
1048 Diagnose inconsistencies in the argument list. Returns TRUE if
1049 the prototype is compatible, FALSE if not. */
1051 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1053 tree newargs
, oldargs
;
1056 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1058 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1059 newargs
= TYPE_ARG_TYPES (newtype
);
1064 tree oldargtype
= TREE_VALUE (oldargs
);
1065 tree newargtype
= TREE_VALUE (newargs
);
1067 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1070 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1071 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1073 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1076 /* Reaching the end of just one list means the two decls don't
1077 agree on the number of arguments. */
1078 if (END_OF_ARGLIST (oldargtype
))
1080 error ("prototype for %q+D declares more arguments "
1081 "than previous old-style definition", newdecl
);
1084 else if (END_OF_ARGLIST (newargtype
))
1086 error ("prototype for %q+D declares fewer arguments "
1087 "than previous old-style definition", newdecl
);
1091 /* Type for passing arg must be consistent with that declared
1093 else if (!comptypes (oldargtype
, newargtype
))
1095 error ("prototype for %q+D declares argument %d"
1096 " with incompatible type",
1101 oldargs
= TREE_CHAIN (oldargs
);
1102 newargs
= TREE_CHAIN (newargs
);
1106 /* If we get here, no errors were found, but do issue a warning
1107 for this poor-style construct. */
1108 warning (0, "prototype for %q+D follows non-prototype definition",
1111 #undef END_OF_ARGLIST
1114 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1115 first in a pair of mismatched declarations, using the diagnostic
1118 locate_old_decl (tree decl
)
1120 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1122 else if (DECL_INITIAL (decl
))
1123 inform (input_location
, "previous definition of %q+D was here", decl
);
1124 else if (C_DECL_IMPLICIT (decl
))
1125 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1127 inform (input_location
, "previous declaration of %q+D was here", decl
);
1130 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1131 Returns true if the caller should proceed to merge the two, false
1132 if OLDDECL should simply be discarded. As a side effect, issues
1133 all necessary diagnostics for invalid or poor-style combinations.
1134 If it returns true, writes the types of NEWDECL and OLDDECL to
1135 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1136 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1139 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1140 tree
*newtypep
, tree
*oldtypep
)
1142 tree newtype
, oldtype
;
1143 bool pedwarned
= false;
1144 bool warned
= false;
1147 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1148 && DECL_EXTERNAL (DECL))
1150 /* If we have error_mark_node for either decl or type, just discard
1151 the previous decl - we're in an error cascade already. */
1152 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1154 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1155 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1156 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1159 /* Two different categories of symbol altogether. This is an error
1160 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1161 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1163 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1164 && DECL_BUILT_IN (olddecl
)
1165 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1167 error ("%q+D redeclared as different kind of symbol", newdecl
);
1168 locate_old_decl (olddecl
);
1170 else if (TREE_PUBLIC (newdecl
))
1171 warning (0, "built-in function %q+D declared as non-function",
1174 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1175 "a built-in function", newdecl
);
1179 /* Enumerators have no linkage, so may only be declared once in a
1181 if (TREE_CODE (olddecl
) == CONST_DECL
)
1183 error ("redeclaration of enumerator %q+D", newdecl
);
1184 locate_old_decl (olddecl
);
1188 if (!comptypes (oldtype
, newtype
))
1190 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1191 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1193 /* Accept harmless mismatch in function types.
1194 This is for the ffs and fprintf builtins. */
1195 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1197 if (trytype
&& comptypes (newtype
, trytype
))
1198 *oldtypep
= oldtype
= trytype
;
1201 /* If types don't match for a built-in, throw away the
1202 built-in. No point in calling locate_old_decl here, it
1203 won't print anything. */
1204 warning (0, "conflicting types for built-in function %q+D",
1209 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1210 && DECL_IS_BUILTIN (olddecl
))
1212 /* A conflicting function declaration for a predeclared
1213 function that isn't actually built in. Objective C uses
1214 these. The new declaration silently overrides everything
1215 but the volatility (i.e. noreturn) indication. See also
1216 below. FIXME: Make Objective C use normal builtins. */
1217 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1220 /* Permit void foo (...) to match int foo (...) if the latter is
1221 the definition and implicit int was used. See
1222 c-torture/compile/920625-2.c. */
1223 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1224 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1225 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1226 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1228 pedwarned
= pedwarn (input_location
, 0,
1229 "conflicting types for %q+D", newdecl
);
1230 /* Make sure we keep void as the return type. */
1231 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1232 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1234 /* Permit void foo (...) to match an earlier call to foo (...) with
1235 no declared type (thus, implicitly int). */
1236 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1237 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1238 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1239 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1241 pedwarned
= pedwarn (input_location
, 0,
1242 "conflicting types for %q+D", newdecl
);
1243 /* Make sure we keep void as the return type. */
1244 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1248 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1249 error ("conflicting type qualifiers for %q+D", newdecl
);
1251 error ("conflicting types for %q+D", newdecl
);
1252 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1253 locate_old_decl (olddecl
);
1258 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1259 but silently ignore the redeclaration if either is in a system
1260 header. (Conflicting redeclarations were handled above.) */
1261 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1263 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1264 || DECL_IN_SYSTEM_HEADER (olddecl
)
1265 || TREE_NO_WARNING (newdecl
)
1266 || TREE_NO_WARNING (olddecl
))
1267 return true; /* Allow OLDDECL to continue in use. */
1269 error ("redefinition of typedef %q+D", newdecl
);
1270 locate_old_decl (olddecl
);
1274 /* Function declarations can either be 'static' or 'extern' (no
1275 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1276 can never conflict with each other on account of linkage
1277 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1278 gnu89 mode permits two definitions if one is 'extern inline' and
1279 one is not. The non- extern-inline definition supersedes the
1280 extern-inline definition. */
1282 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1284 /* If you declare a built-in function name as static, or
1285 define the built-in with an old-style definition (so we
1286 can't validate the argument list) the built-in definition is
1287 overridden, but optionally warn this was a bad choice of name. */
1288 if (DECL_BUILT_IN (olddecl
)
1289 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1290 && (!TREE_PUBLIC (newdecl
)
1291 || (DECL_INITIAL (newdecl
)
1292 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1294 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1295 "a built-in function", newdecl
);
1296 /* Discard the old built-in function. */
1300 if (DECL_INITIAL (newdecl
))
1302 if (DECL_INITIAL (olddecl
))
1304 /* If both decls are in the same TU and the new declaration
1305 isn't overriding an extern inline reject the new decl.
1306 In c99, no overriding is allowed in the same translation
1308 if ((!DECL_EXTERN_INLINE (olddecl
)
1309 || DECL_EXTERN_INLINE (newdecl
)
1310 || (!flag_gnu89_inline
1311 && (!DECL_DECLARED_INLINE_P (olddecl
)
1312 || !lookup_attribute ("gnu_inline",
1313 DECL_ATTRIBUTES (olddecl
)))
1314 && (!DECL_DECLARED_INLINE_P (newdecl
)
1315 || !lookup_attribute ("gnu_inline",
1316 DECL_ATTRIBUTES (newdecl
))))
1318 && same_translation_unit_p (newdecl
, olddecl
))
1320 error ("redefinition of %q+D", newdecl
);
1321 locate_old_decl (olddecl
);
1326 /* If we have a prototype after an old-style function definition,
1327 the argument types must be checked specially. */
1328 else if (DECL_INITIAL (olddecl
)
1329 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1330 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1331 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1333 locate_old_decl (olddecl
);
1336 /* A non-static declaration (even an "extern") followed by a
1337 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1338 The same is true for a static forward declaration at block
1339 scope followed by a non-static declaration/definition at file
1340 scope. Static followed by non-static at the same scope is
1341 not undefined behavior, and is the most convenient way to get
1342 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1343 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1344 we do diagnose it if -Wtraditional. */
1345 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1347 /* Two exceptions to the rule. If olddecl is an extern
1348 inline, or a predeclared function that isn't actually
1349 built in, newdecl silently overrides olddecl. The latter
1350 occur only in Objective C; see also above. (FIXME: Make
1351 Objective C use normal builtins.) */
1352 if (!DECL_IS_BUILTIN (olddecl
)
1353 && !DECL_EXTERN_INLINE (olddecl
))
1355 error ("static declaration of %q+D follows "
1356 "non-static declaration", newdecl
);
1357 locate_old_decl (olddecl
);
1361 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1363 if (DECL_CONTEXT (olddecl
))
1365 error ("non-static declaration of %q+D follows "
1366 "static declaration", newdecl
);
1367 locate_old_decl (olddecl
);
1370 else if (warn_traditional
)
1372 warned
|= warning (OPT_Wtraditional
,
1373 "non-static declaration of %q+D "
1374 "follows static declaration", newdecl
);
1378 /* Make sure gnu_inline attribute is either not present, or
1379 present on all inline decls. */
1380 if (DECL_DECLARED_INLINE_P (olddecl
)
1381 && DECL_DECLARED_INLINE_P (newdecl
))
1383 bool newa
= lookup_attribute ("gnu_inline",
1384 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1385 bool olda
= lookup_attribute ("gnu_inline",
1386 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1389 error ("%<gnu_inline%> attribute present on %q+D",
1390 newa
? newdecl
: olddecl
);
1391 error ("%Jbut not here", newa
? olddecl
: newdecl
);
1395 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1397 /* Only variables can be thread-local, and all declarations must
1398 agree on this property. */
1399 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1401 /* Nothing to check. Since OLDDECL is marked threadprivate
1402 and NEWDECL does not have a thread-local attribute, we
1403 will merge the threadprivate attribute into NEWDECL. */
1406 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1408 if (DECL_THREAD_LOCAL_P (newdecl
))
1409 error ("thread-local declaration of %q+D follows "
1410 "non-thread-local declaration", newdecl
);
1412 error ("non-thread-local declaration of %q+D follows "
1413 "thread-local declaration", newdecl
);
1415 locate_old_decl (olddecl
);
1419 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1420 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1422 error ("redefinition of %q+D", newdecl
);
1423 locate_old_decl (olddecl
);
1427 /* Objects declared at file scope: if the first declaration had
1428 external linkage (even if it was an external reference) the
1429 second must have external linkage as well, or the behavior is
1430 undefined. If the first declaration had internal linkage, then
1431 the second must too, or else be an external reference (in which
1432 case the composite declaration still has internal linkage).
1433 As for function declarations, we warn about the static-then-
1434 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1435 if (DECL_FILE_SCOPE_P (newdecl
)
1436 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1438 if (DECL_EXTERNAL (newdecl
))
1440 if (!DECL_FILE_SCOPE_P (olddecl
))
1442 error ("extern declaration of %q+D follows "
1443 "declaration with no linkage", newdecl
);
1444 locate_old_decl (olddecl
);
1447 else if (warn_traditional
)
1449 warned
|= warning (OPT_Wtraditional
,
1450 "non-static declaration of %q+D "
1451 "follows static declaration", newdecl
);
1456 if (TREE_PUBLIC (newdecl
))
1457 error ("non-static declaration of %q+D follows "
1458 "static declaration", newdecl
);
1460 error ("static declaration of %q+D follows "
1461 "non-static declaration", newdecl
);
1463 locate_old_decl (olddecl
);
1467 /* Two objects with the same name declared at the same block
1468 scope must both be external references (6.7p3). */
1469 else if (!DECL_FILE_SCOPE_P (newdecl
))
1471 if (DECL_EXTERNAL (newdecl
))
1473 /* Extern with initializer at block scope, which will
1474 already have received an error. */
1476 else if (DECL_EXTERNAL (olddecl
))
1478 error ("declaration of %q+D with no linkage follows "
1479 "extern declaration", newdecl
);
1480 locate_old_decl (olddecl
);
1484 error ("redeclaration of %q+D with no linkage", newdecl
);
1485 locate_old_decl (olddecl
);
1493 /* All decls must agree on a visibility. */
1494 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
1495 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1496 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1498 warned
|= warning (0, "redeclaration of %q+D with different visibility "
1499 "(old visibility preserved)", newdecl
);
1502 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1504 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1505 if (DECL_DECLARED_INLINE_P (newdecl
)
1506 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1508 warned
|= warning (OPT_Wattributes
,
1509 "inline declaration of %qD follows "
1510 "declaration with attribute noinline", newdecl
);
1512 else if (DECL_DECLARED_INLINE_P (olddecl
)
1513 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1515 warned
|= warning (OPT_Wattributes
,
1516 "declaration of %q+D with attribute "
1517 "noinline follows inline declaration ", newdecl
);
1520 else /* PARM_DECL, VAR_DECL */
1522 /* Redeclaration of a parameter is a constraint violation (this is
1523 not explicitly stated, but follows from C99 6.7p3 [no more than
1524 one declaration of the same identifier with no linkage in the
1525 same scope, except type tags] and 6.2.2p6 [parameters have no
1526 linkage]). We must check for a forward parameter declaration,
1527 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1528 an extension, the mandatory diagnostic for which is handled by
1529 mark_forward_parm_decls. */
1531 if (TREE_CODE (newdecl
) == PARM_DECL
1532 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1534 error ("redefinition of parameter %q+D", newdecl
);
1535 locate_old_decl (olddecl
);
1540 /* Optional warning for completely redundant decls. */
1541 if (!warned
&& !pedwarned
1542 && warn_redundant_decls
1543 /* Don't warn about a function declaration followed by a
1545 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1546 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1547 /* Don't warn about redundant redeclarations of builtins. */
1548 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1549 && !DECL_BUILT_IN (newdecl
)
1550 && DECL_BUILT_IN (olddecl
)
1551 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1552 /* Don't warn about an extern followed by a definition. */
1553 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1554 /* Don't warn about forward parameter decls. */
1555 && !(TREE_CODE (newdecl
) == PARM_DECL
1556 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1557 /* Don't warn about a variable definition following a declaration. */
1558 && !(TREE_CODE (newdecl
) == VAR_DECL
1559 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
1561 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
1565 /* Report location of previous decl/defn. */
1566 if (warned
|| pedwarned
)
1567 locate_old_decl (olddecl
);
1569 #undef DECL_EXTERN_INLINE
1574 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1575 consistent with OLDDECL, but carries new information. Merge the
1576 new information into OLDDECL. This function issues no
1580 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1582 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1583 && DECL_INITIAL (newdecl
) != 0);
1584 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1585 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
1586 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
1587 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
1588 bool extern_changed
= false;
1590 /* For real parm decl following a forward decl, rechain the old decl
1591 in its new location and clear TREE_ASM_WRITTEN (it's not a
1592 forward decl anymore). */
1593 if (TREE_CODE (newdecl
) == PARM_DECL
1594 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1596 struct c_binding
*b
, **here
;
1598 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1599 if ((*here
)->decl
== olddecl
)
1606 b
->prev
= current_scope
->bindings
;
1607 current_scope
->bindings
= b
;
1609 TREE_ASM_WRITTEN (olddecl
) = 0;
1612 DECL_ATTRIBUTES (newdecl
)
1613 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1615 /* Merge the data types specified in the two decls. */
1617 = TREE_TYPE (olddecl
)
1618 = composite_type (newtype
, oldtype
);
1620 /* Lay the type out, unless already done. */
1621 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
1623 if (TREE_TYPE (newdecl
) != error_mark_node
)
1624 layout_type (TREE_TYPE (newdecl
));
1625 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1626 && TREE_CODE (newdecl
) != TYPE_DECL
1627 && TREE_CODE (newdecl
) != CONST_DECL
)
1628 layout_decl (newdecl
, 0);
1632 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1633 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1634 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1635 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1636 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1638 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1639 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
1643 /* Keep the old rtl since we can safely use it. */
1644 if (HAS_RTL_P (olddecl
))
1645 COPY_DECL_RTL (olddecl
, newdecl
);
1647 /* Merge the type qualifiers. */
1648 if (TREE_READONLY (newdecl
))
1649 TREE_READONLY (olddecl
) = 1;
1651 if (TREE_THIS_VOLATILE (newdecl
))
1652 TREE_THIS_VOLATILE (olddecl
) = 1;
1654 /* Merge deprecatedness. */
1655 if (TREE_DEPRECATED (newdecl
))
1656 TREE_DEPRECATED (olddecl
) = 1;
1658 /* If a decl is in a system header and the other isn't, keep the one on the
1659 system header. Otherwise, keep source location of definition rather than
1660 declaration and of prototype rather than non-prototype unless that
1661 prototype is built-in. */
1662 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
1663 && DECL_IN_SYSTEM_HEADER (olddecl
)
1664 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
1665 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1666 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
1667 && DECL_IN_SYSTEM_HEADER (newdecl
)
1668 && !DECL_IN_SYSTEM_HEADER (olddecl
))
1669 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
1670 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1671 || (old_is_prototype
&& !new_is_prototype
1672 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
1673 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1675 /* Merge the initialization information. */
1676 if (DECL_INITIAL (newdecl
) == 0)
1677 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1679 /* Merge the threadprivate attribute. */
1680 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
1682 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
1683 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
1686 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
1688 /* Merge the section attribute.
1689 We want to issue an error if the sections conflict but that
1690 must be done later in decl_attributes since we are called
1691 before attributes are assigned. */
1692 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1693 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1695 /* Copy the assembler name.
1696 Currently, it can only be defined in the prototype. */
1697 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1699 /* Use visibility of whichever declaration had it specified */
1700 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1702 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1703 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1706 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1708 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1709 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1710 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1711 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1712 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1713 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1714 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1715 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
1716 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1717 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1718 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
1721 /* Merge the storage class information. */
1722 merge_weak (newdecl
, olddecl
);
1724 /* For functions, static overrides non-static. */
1725 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1727 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1728 /* This is since we don't automatically
1729 copy the attributes of NEWDECL into OLDDECL. */
1730 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1731 /* If this clears `static', clear it in the identifier too. */
1732 if (!TREE_PUBLIC (olddecl
))
1733 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1737 /* In c99, 'extern' declaration before (or after) 'inline' means this
1738 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1740 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1741 && !flag_gnu89_inline
1742 && (DECL_DECLARED_INLINE_P (newdecl
)
1743 || DECL_DECLARED_INLINE_P (olddecl
))
1744 && (!DECL_DECLARED_INLINE_P (newdecl
)
1745 || !DECL_DECLARED_INLINE_P (olddecl
)
1746 || !DECL_EXTERNAL (olddecl
))
1747 && DECL_EXTERNAL (newdecl
)
1748 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
1749 && !current_function_decl
)
1750 DECL_EXTERNAL (newdecl
) = 0;
1752 if (DECL_EXTERNAL (newdecl
))
1754 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1755 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1757 /* An extern decl does not override previous storage class. */
1758 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1759 if (!DECL_EXTERNAL (newdecl
))
1761 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1762 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1767 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1768 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1771 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1773 /* If we're redefining a function previously defined as extern
1774 inline, make sure we emit debug info for the inline before we
1775 throw it away, in case it was inlined into a function that
1776 hasn't been written out yet. */
1777 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1778 /* The new defn must not be inline. */
1779 DECL_UNINLINABLE (newdecl
) = 1;
1782 /* If either decl says `inline', this fn is inline, unless
1783 its definition was passed already. */
1784 if (DECL_DECLARED_INLINE_P (newdecl
)
1785 || DECL_DECLARED_INLINE_P (olddecl
))
1786 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1788 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1789 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1791 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
1792 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
1793 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
1794 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
1797 if (DECL_BUILT_IN (olddecl
))
1799 /* If redeclaring a builtin function, it stays built in.
1800 But it gets tagged as having been declared. */
1801 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1802 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1803 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1804 if (new_is_prototype
)
1805 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
1807 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
1808 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
1811 /* Preserve function specific target and optimization options */
1812 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
1813 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
1814 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
1815 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
1817 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
1818 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
1819 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
1820 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
1822 /* Also preserve various other info from the definition. */
1823 if (!new_is_definition
)
1825 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1826 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1827 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1828 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1829 gimple_set_body (newdecl
, gimple_body (olddecl
));
1830 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1832 /* See if we've got a function to instantiate from. */
1833 if (DECL_SAVED_TREE (olddecl
))
1834 DECL_ABSTRACT_ORIGIN (newdecl
)
1835 = DECL_ABSTRACT_ORIGIN (olddecl
);
1839 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
1841 /* Merge the USED information. */
1842 if (TREE_USED (olddecl
))
1843 TREE_USED (newdecl
) = 1;
1844 else if (TREE_USED (newdecl
))
1845 TREE_USED (olddecl
) = 1;
1847 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1848 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1850 unsigned olddecl_uid
= DECL_UID (olddecl
);
1851 tree olddecl_context
= DECL_CONTEXT (olddecl
);
1853 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1854 (char *) newdecl
+ sizeof (struct tree_common
),
1855 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
1856 switch (TREE_CODE (olddecl
))
1859 gimple_set_body (olddecl
, gimple_body (newdecl
));
1869 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1870 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1871 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
1876 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1877 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1878 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
1880 DECL_UID (olddecl
) = olddecl_uid
;
1881 DECL_CONTEXT (olddecl
) = olddecl_context
;
1884 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1885 so that encode_section_info has a chance to look at the new decl
1886 flags and attributes. */
1887 if (DECL_RTL_SET_P (olddecl
)
1888 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1889 || (TREE_CODE (olddecl
) == VAR_DECL
1890 && TREE_STATIC (olddecl
))))
1891 make_decl_rtl (olddecl
);
1893 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1894 and the definition is coming from the old version, cgraph needs
1895 to be called again. */
1896 if (extern_changed
&& !new_is_definition
1897 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
1898 cgraph_mark_if_needed (olddecl
);
1901 /* Handle when a new declaration NEWDECL has the same name as an old
1902 one OLDDECL in the same binding contour. Prints an error message
1905 If safely possible, alter OLDDECL to look like NEWDECL, and return
1906 true. Otherwise, return false. */
1909 duplicate_decls (tree newdecl
, tree olddecl
)
1911 tree newtype
= NULL
, oldtype
= NULL
;
1913 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1915 /* Avoid `unused variable' and other warnings for OLDDECL. */
1916 TREE_NO_WARNING (olddecl
) = 1;
1920 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1925 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1927 warn_if_shadowing (tree new_decl
)
1929 struct c_binding
*b
;
1931 /* Shadow warnings wanted? */
1933 /* No shadow warnings for internally generated vars. */
1934 || DECL_IS_BUILTIN (new_decl
)
1935 /* No shadow warnings for vars made for inlining. */
1936 || DECL_FROM_INLINE (new_decl
))
1939 /* Is anything being shadowed? Invisible decls do not count. */
1940 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1941 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1943 tree old_decl
= b
->decl
;
1945 if (old_decl
== error_mark_node
)
1947 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
1948 "non-variable", new_decl
);
1951 else if (TREE_CODE (old_decl
) == PARM_DECL
)
1952 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
1954 else if (DECL_FILE_SCOPE_P (old_decl
))
1955 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
1956 "declaration", new_decl
);
1957 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1958 && DECL_BUILT_IN (old_decl
))
1960 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1961 "a built-in function", new_decl
);
1965 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
1968 warning (OPT_Wshadow
, "%Jshadowed declaration is here", old_decl
);
1975 /* Subroutine of pushdecl.
1977 X is a TYPE_DECL for a typedef statement. Create a brand new
1978 ..._TYPE node (which will be just a variant of the existing
1979 ..._TYPE node with identical properties) and then install X
1980 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1982 The whole point here is to end up with a situation where each
1983 and every ..._TYPE node the compiler creates will be uniquely
1984 associated with AT MOST one node representing a typedef name.
1985 This way, even though the compiler substitutes corresponding
1986 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1987 early on, later parts of the compiler can always do the reverse
1988 translation and get back the corresponding typedef name. For
1991 typedef struct S MY_TYPE;
1994 Later parts of the compiler might only know that `object' was of
1995 type `struct S' if it were not for code just below. With this
1996 code however, later parts of the compiler see something like:
1998 struct S' == struct S
1999 typedef struct S' MY_TYPE;
2002 And they can then deduce (from the node for type struct S') that
2003 the original object declaration was:
2007 Being able to do this is important for proper support of protoize,
2008 and also for generating precise symbolic debugging information
2009 which takes full account of the programmer's (typedef) vocabulary.
2011 Obviously, we don't want to generate a duplicate ..._TYPE node if
2012 the TYPE_DECL node that we are now processing really represents a
2013 standard built-in type. */
2016 clone_underlying_type (tree x
)
2018 if (DECL_IS_BUILTIN (x
))
2020 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2021 TYPE_NAME (TREE_TYPE (x
)) = x
;
2023 else if (TREE_TYPE (x
) != error_mark_node
2024 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2026 tree tt
= TREE_TYPE (x
);
2027 DECL_ORIGINAL_TYPE (x
) = tt
;
2028 tt
= build_variant_type_copy (tt
);
2030 TREE_USED (tt
) = TREE_USED (x
);
2035 /* Record a decl-node X as belonging to the current lexical scope.
2036 Check for errors (such as an incompatible declaration for the same
2037 name already seen in the same scope).
2039 Returns either X or an old decl for the same name.
2040 If an old decl is returned, it may have been smashed
2041 to agree with what X says. */
2046 tree name
= DECL_NAME (x
);
2047 struct c_scope
*scope
= current_scope
;
2048 struct c_binding
*b
;
2049 bool nested
= false;
2051 /* Must set DECL_CONTEXT for everything not at file scope or
2052 DECL_FILE_SCOPE_P won't work. Local externs don't count
2053 unless they have initializers (which generate code). */
2054 if (current_function_decl
2055 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2056 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2057 DECL_CONTEXT (x
) = current_function_decl
;
2059 /* If this is of variably modified type, prevent jumping into its
2061 if ((TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == TYPE_DECL
)
2062 && variably_modified_type_p (TREE_TYPE (x
), NULL_TREE
))
2063 c_begin_vm_scope (scope
->depth
);
2065 /* Anonymous decls are just inserted in the scope. */
2068 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false);
2072 /* First, see if there is another declaration with the same name in
2073 the current scope. If there is, duplicate_decls may do all the
2074 work for us. If duplicate_decls returns false, that indicates
2075 two incompatible decls in the same scope; we are to silently
2076 replace the old one (duplicate_decls has issued all appropriate
2077 diagnostics). In particular, we should not consider possible
2078 duplicates in the external scope, or shadowing. */
2079 b
= I_SYMBOL_BINDING (name
);
2080 if (b
&& B_IN_SCOPE (b
, scope
))
2082 struct c_binding
*b_ext
, *b_use
;
2083 tree type
= TREE_TYPE (x
);
2084 tree visdecl
= b
->decl
;
2085 tree vistype
= TREE_TYPE (visdecl
);
2086 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2087 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2088 b
->inner_comp
= false;
2091 /* If this is an external linkage declaration, we should check
2092 for compatibility with the type in the external scope before
2093 setting the type at this scope based on the visible
2094 information only. */
2095 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2097 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2098 b_ext
= b_ext
->shadowed
;
2103 TREE_TYPE (b_use
->decl
) = b_use
->type
;
2106 if (duplicate_decls (x
, b_use
->decl
))
2110 /* Save the updated type in the external scope and
2111 restore the proper type for this scope. */
2113 if (comptypes (vistype
, type
))
2114 thistype
= composite_type (vistype
, type
);
2116 thistype
= TREE_TYPE (b_use
->decl
);
2117 b_use
->type
= TREE_TYPE (b_use
->decl
);
2118 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2119 && DECL_BUILT_IN (b_use
->decl
))
2121 = build_type_attribute_variant (thistype
,
2124 TREE_TYPE (b_use
->decl
) = thistype
;
2129 goto skip_external_and_shadow_checks
;
2132 /* All declarations with external linkage, and all external
2133 references, go in the external scope, no matter what scope is
2134 current. However, the binding in that scope is ignored for
2135 purposes of normal name lookup. A separate binding structure is
2136 created in the requested scope; this governs the normal
2137 visibility of the symbol.
2139 The binding in the externals scope is used exclusively for
2140 detecting duplicate declarations of the same object, no matter
2141 what scope they are in; this is what we do here. (C99 6.2.7p2:
2142 All declarations that refer to the same object or function shall
2143 have compatible type; otherwise, the behavior is undefined.) */
2144 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2146 tree type
= TREE_TYPE (x
);
2149 bool type_saved
= false;
2150 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2151 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2152 || TREE_CODE (b
->decl
) == VAR_DECL
)
2153 && DECL_FILE_SCOPE_P (b
->decl
))
2156 vistype
= TREE_TYPE (visdecl
);
2158 if (scope
!= file_scope
2159 && !DECL_IN_SYSTEM_HEADER (x
))
2160 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2162 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2164 /* If this decl might be modified, save its type. This is
2165 done here rather than when the decl is first bound
2166 because the type may change after first binding, through
2167 being completed or through attributes being added. If we
2168 encounter multiple such decls, only the first should have
2169 its type saved; the others will already have had their
2170 proper types saved and the types will not have changed as
2171 their scopes will not have been re-entered. */
2172 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2174 b
->type
= TREE_TYPE (b
->decl
);
2177 if (B_IN_FILE_SCOPE (b
)
2178 && TREE_CODE (b
->decl
) == VAR_DECL
2179 && TREE_STATIC (b
->decl
)
2180 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2181 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2182 && TREE_CODE (type
) == ARRAY_TYPE
2183 && TYPE_DOMAIN (type
)
2184 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2185 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2187 /* Array type completed in inner scope, which should be
2188 diagnosed if the completion does not have size 1 and
2189 it does not get completed in the file scope. */
2190 b
->inner_comp
= true;
2195 /* If a matching external declaration has been found, set its
2196 type to the composite of all the types of that declaration.
2197 After the consistency checks, it will be reset to the
2198 composite of the visible types only. */
2199 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2201 TREE_TYPE (b
->decl
) = b
->type
;
2203 /* The point of the same_translation_unit_p check here is,
2204 we want to detect a duplicate decl for a construct like
2205 foo() { extern bar(); } ... static bar(); but not if
2206 they are in different translation units. In any case,
2207 the static does not go in the externals scope. */
2209 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2210 && duplicate_decls (x
, b
->decl
))
2215 if (comptypes (vistype
, type
))
2216 thistype
= composite_type (vistype
, type
);
2218 thistype
= TREE_TYPE (b
->decl
);
2222 b
->type
= TREE_TYPE (b
->decl
);
2223 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2225 = build_type_attribute_variant (thistype
,
2226 TYPE_ATTRIBUTES (b
->type
));
2227 TREE_TYPE (b
->decl
) = thistype
;
2228 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2231 else if (TREE_PUBLIC (x
))
2233 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2235 /* An external declaration at block scope referring to a
2236 visible entity with internal linkage. The composite
2237 type will already be correct for this scope, so we
2238 just need to fall through to make the declaration in
2245 bind (name
, x
, external_scope
, /*invisible=*/true,
2252 if (TREE_CODE (x
) != PARM_DECL
)
2253 warn_if_shadowing (x
);
2255 skip_external_and_shadow_checks
:
2256 if (TREE_CODE (x
) == TYPE_DECL
)
2257 clone_underlying_type (x
);
2259 bind (name
, x
, scope
, /*invisible=*/false, nested
);
2261 /* If x's type is incomplete because it's based on a
2262 structure or union which has not yet been fully declared,
2263 attach it to that structure or union type, so we can go
2264 back and complete the variable declaration later, if the
2265 structure or union gets fully declared.
2267 If the input is erroneous, we can have error_mark in the type
2268 slot (e.g. "f(void a, ...)") - that doesn't count as an
2270 if (TREE_TYPE (x
) != error_mark_node
2271 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2273 tree element
= TREE_TYPE (x
);
2275 while (TREE_CODE (element
) == ARRAY_TYPE
)
2276 element
= TREE_TYPE (element
);
2277 element
= TYPE_MAIN_VARIANT (element
);
2279 if ((TREE_CODE (element
) == RECORD_TYPE
2280 || TREE_CODE (element
) == UNION_TYPE
)
2281 && (TREE_CODE (x
) != TYPE_DECL
2282 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2283 && !COMPLETE_TYPE_P (element
))
2284 C_TYPE_INCOMPLETE_VARS (element
)
2285 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2290 /* Record X as belonging to file scope.
2291 This is used only internally by the Objective-C front end,
2292 and is limited to its needs. duplicate_decls is not called;
2293 if there is any preexisting decl for this identifier, it is an ICE. */
2296 pushdecl_top_level (tree x
)
2299 bool nested
= false;
2300 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2302 name
= DECL_NAME (x
);
2304 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2306 if (TREE_PUBLIC (x
))
2308 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false);
2312 bind (name
, x
, file_scope
, /*invisible=*/false, nested
);
2318 implicit_decl_warning (tree id
, tree olddecl
)
2320 if (warn_implicit_function_declaration
)
2325 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2326 "implicit declaration of function %qE", id
);
2328 warned
= warning (OPT_Wimplicit_function_declaration
,
2329 G_("implicit declaration of function %qE"), id
);
2330 if (olddecl
&& warned
)
2331 locate_old_decl (olddecl
);
2335 /* Generate an implicit declaration for identifier FUNCTIONID as a
2336 function of type int (). */
2339 implicitly_declare (tree functionid
)
2341 struct c_binding
*b
;
2345 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2347 if (B_IN_SCOPE (b
, external_scope
))
2356 if (decl
== error_mark_node
)
2359 /* FIXME: Objective-C has weird not-really-builtin functions
2360 which are supposed to be visible automatically. They wind up
2361 in the external scope because they're pushed before the file
2362 scope gets created. Catch this here and rebind them into the
2364 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2366 bind (functionid
, decl
, file_scope
,
2367 /*invisible=*/false, /*nested=*/true);
2372 tree newtype
= default_function_type
;
2374 TREE_TYPE (decl
) = b
->type
;
2375 /* Implicit declaration of a function already declared
2376 (somehow) in a different scope, or as a built-in.
2377 If this is the first time this has happened, warn;
2378 then recycle the old declaration but with the new type. */
2379 if (!C_DECL_IMPLICIT (decl
))
2381 implicit_decl_warning (functionid
, decl
);
2382 C_DECL_IMPLICIT (decl
) = 1;
2384 if (DECL_BUILT_IN (decl
))
2386 newtype
= build_type_attribute_variant (newtype
,
2388 (TREE_TYPE (decl
)));
2389 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2391 warning (0, "incompatible implicit declaration of built-in"
2392 " function %qD", decl
);
2393 newtype
= TREE_TYPE (decl
);
2398 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2400 error ("incompatible implicit declaration of function %qD",
2402 locate_old_decl (decl
);
2405 b
->type
= TREE_TYPE (decl
);
2406 TREE_TYPE (decl
) = newtype
;
2407 bind (functionid
, decl
, current_scope
,
2408 /*invisible=*/false, /*nested=*/true);
2413 /* Not seen before. */
2414 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2415 DECL_EXTERNAL (decl
) = 1;
2416 TREE_PUBLIC (decl
) = 1;
2417 C_DECL_IMPLICIT (decl
) = 1;
2418 implicit_decl_warning (functionid
, 0);
2419 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2421 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2423 /* C89 says implicit declarations are in the innermost block.
2424 So we record the decl in the standard fashion. */
2425 decl
= pushdecl (decl
);
2427 /* No need to call objc_check_decl here - it's a function type. */
2428 rest_of_decl_compilation (decl
, 0, 0);
2430 /* Write a record describing this implicit function declaration
2431 to the prototypes file (if requested). */
2432 gen_aux_info_record (decl
, 0, 1, 0);
2434 /* Possibly apply some default attributes to this implicit declaration. */
2435 decl_attributes (&decl
, NULL_TREE
, 0);
2440 /* Issue an error message for a reference to an undeclared variable
2441 ID, including a reference to a builtin outside of function-call
2442 context. Establish a binding of the identifier to error_mark_node
2443 in an appropriate scope, which will suppress further errors for the
2444 same identifier. The error message should be given location LOC. */
2446 undeclared_variable (tree id
, location_t loc
)
2448 static bool already
= false;
2449 struct c_scope
*scope
;
2451 if (current_function_decl
== 0)
2453 error ("%H%qE undeclared here (not in a function)", &loc
, id
);
2454 scope
= current_scope
;
2458 error ("%H%qE undeclared (first use in this function)", &loc
, id
);
2462 error ("%H(Each undeclared identifier is reported only once", &loc
);
2463 error ("%Hfor each function it appears in.)", &loc
);
2467 /* If we are parsing old-style parameter decls, current_function_decl
2468 will be nonnull but current_function_scope will be null. */
2469 scope
= current_function_scope
? current_function_scope
: current_scope
;
2471 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false);
2474 /* Subroutine of lookup_label, declare_label, define_label: construct a
2475 LABEL_DECL with all the proper frills. */
2478 make_label (tree name
, location_t location
)
2480 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2482 DECL_CONTEXT (label
) = current_function_decl
;
2483 DECL_MODE (label
) = VOIDmode
;
2484 DECL_SOURCE_LOCATION (label
) = location
;
2489 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2490 Create one if none exists so far for the current function.
2491 This is called when a label is used in a goto expression or
2492 has its address taken. */
2495 lookup_label (tree name
)
2499 if (current_function_decl
== 0)
2501 error ("label %qE referenced outside of any function", name
);
2505 /* Use a label already defined or ref'd with this name, but not if
2506 it is inherited from a containing function and wasn't declared
2508 label
= I_LABEL_DECL (name
);
2509 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2510 || C_DECLARED_LABEL_FLAG (label
)))
2512 /* If the label has only been declared, update its apparent
2513 location to point here, for better diagnostics if it
2514 turns out not to have been defined. */
2515 if (!TREE_USED (label
))
2516 DECL_SOURCE_LOCATION (label
) = input_location
;
2520 /* No label binding for that identifier; make one. */
2521 label
= make_label (name
, input_location
);
2523 /* Ordinary labels go in the current function scope. */
2524 bind (name
, label
, current_function_scope
,
2525 /*invisible=*/false, /*nested=*/false);
2529 /* Make a label named NAME in the current function, shadowing silently
2530 any that may be inherited from containing functions or containing
2531 scopes. This is called for __label__ declarations. */
2534 declare_label (tree name
)
2536 struct c_binding
*b
= I_LABEL_BINDING (name
);
2539 /* Check to make sure that the label hasn't already been declared
2541 if (b
&& B_IN_CURRENT_SCOPE (b
))
2543 error ("duplicate label declaration %qE", name
);
2544 locate_old_decl (b
->decl
);
2546 /* Just use the previous declaration. */
2550 label
= make_label (name
, input_location
);
2551 C_DECLARED_LABEL_FLAG (label
) = 1;
2553 /* Declared labels go in the current scope. */
2554 bind (name
, label
, current_scope
,
2555 /*invisible=*/false, /*nested=*/false);
2559 /* Define a label, specifying the location in the source file.
2560 Return the LABEL_DECL node for the label, if the definition is valid.
2561 Otherwise return 0. */
2564 define_label (location_t location
, tree name
)
2566 /* Find any preexisting label with this name. It is an error
2567 if that label has already been defined in this function, or
2568 if there is a containing function with a declared label with
2570 tree label
= I_LABEL_DECL (name
);
2571 struct c_label_list
*nlist_se
, *nlist_vm
;
2574 && ((DECL_CONTEXT (label
) == current_function_decl
2575 && DECL_INITIAL (label
) != 0)
2576 || (DECL_CONTEXT (label
) != current_function_decl
2577 && C_DECLARED_LABEL_FLAG (label
))))
2579 error ("%Hduplicate label %qD", &location
, label
);
2580 locate_old_decl (label
);
2583 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2585 /* The label has been used or declared already in this function,
2586 but not defined. Update its location to point to this
2588 if (C_DECL_UNDEFINABLE_STMT_EXPR (label
))
2589 error ("%Jjump into statement expression", label
);
2590 if (C_DECL_UNDEFINABLE_VM (label
))
2591 error ("%Jjump into scope of identifier with variably modified type",
2593 DECL_SOURCE_LOCATION (label
) = location
;
2597 /* No label binding for that identifier; make one. */
2598 label
= make_label (name
, location
);
2600 /* Ordinary labels go in the current function scope. */
2601 bind (name
, label
, current_function_scope
,
2602 /*invisible=*/false, /*nested=*/false);
2605 if (!in_system_header
&& lookup_name (name
))
2606 warning (OPT_Wtraditional
, "%Htraditional C lacks a separate namespace "
2607 "for labels, identifier %qE conflicts", &location
, name
);
2609 nlist_se
= XOBNEW (&parser_obstack
, struct c_label_list
);
2610 nlist_se
->next
= label_context_stack_se
->labels_def
;
2611 nlist_se
->label
= label
;
2612 label_context_stack_se
->labels_def
= nlist_se
;
2614 nlist_vm
= XOBNEW (&parser_obstack
, struct c_label_list
);
2615 nlist_vm
->next
= label_context_stack_vm
->labels_def
;
2616 nlist_vm
->label
= label
;
2617 label_context_stack_vm
->labels_def
= nlist_vm
;
2619 /* Mark label as having been defined. */
2620 DECL_INITIAL (label
) = error_mark_node
;
2624 /* Given NAME, an IDENTIFIER_NODE,
2625 return the structure (or union or enum) definition for that name.
2626 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2627 CODE says which kind of type the caller wants;
2628 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2629 If the wrong kind of type is found, an error is reported. */
2632 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2634 struct c_binding
*b
= I_TAG_BINDING (name
);
2640 /* We only care about whether it's in this level if
2641 thislevel_only was set or it might be a type clash. */
2642 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2644 /* For our purposes, a tag in the external scope is the same as
2645 a tag in the file scope. (Primarily relevant to Objective-C
2646 and its builtin structure tags, which get pushed before the
2647 file scope is created.) */
2648 if (B_IN_CURRENT_SCOPE (b
)
2649 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2653 if (thislevel_only
&& !thislevel
)
2656 if (TREE_CODE (b
->decl
) != code
)
2658 /* Definition isn't the kind we were looking for. */
2659 pending_invalid_xref
= name
;
2660 pending_invalid_xref_location
= input_location
;
2662 /* If in the same binding level as a declaration as a tag
2663 of a different type, this must not be allowed to
2664 shadow that tag, so give the error immediately.
2665 (For example, "struct foo; union foo;" is invalid.) */
2667 pending_xref_error ();
2672 /* Print an error message now
2673 for a recent invalid struct, union or enum cross reference.
2674 We don't print them immediately because they are not invalid
2675 when used in the `struct foo;' construct for shadowing. */
2678 pending_xref_error (void)
2680 if (pending_invalid_xref
!= 0)
2681 error ("%H%qE defined as wrong kind of tag",
2682 &pending_invalid_xref_location
, pending_invalid_xref
);
2683 pending_invalid_xref
= 0;
2687 /* Look up NAME in the current scope and its superiors
2688 in the namespace of variables, functions and typedefs.
2689 Return a ..._DECL node of some kind representing its definition,
2690 or return 0 if it is undefined. */
2693 lookup_name (tree name
)
2695 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2696 if (b
&& !b
->invisible
)
2701 /* Similar to `lookup_name' but look only at the indicated scope. */
2704 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2706 struct c_binding
*b
;
2708 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2709 if (B_IN_SCOPE (b
, scope
))
2714 /* Create the predefined scalar types of C,
2715 and some nodes representing standard constants (0, 1, (void *) 0).
2716 Initialize the global scope.
2717 Make definitions for built-in primitive functions. */
2720 c_init_decl_processing (void)
2722 location_t save_loc
= input_location
;
2724 /* Initialize reserved words for parser. */
2727 current_function_decl
= 0;
2729 gcc_obstack_init (&parser_obstack
);
2731 /* Make the externals scope. */
2733 external_scope
= current_scope
;
2735 /* Declarations from c_common_nodes_and_builtins must not be associated
2736 with this input file, lest we get differences between using and not
2737 using preprocessed headers. */
2738 input_location
= BUILTINS_LOCATION
;
2740 build_common_tree_nodes (flag_signed_char
, false);
2742 c_common_nodes_and_builtins ();
2744 /* In C, comparisons and TRUTH_* expressions have type int. */
2745 truthvalue_type_node
= integer_type_node
;
2746 truthvalue_true_node
= integer_one_node
;
2747 truthvalue_false_node
= integer_zero_node
;
2749 /* Even in C99, which has a real boolean type. */
2750 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2751 boolean_type_node
));
2753 input_location
= save_loc
;
2755 pedantic_lvalues
= true;
2757 make_fname_decl
= c_make_fname_decl
;
2758 start_fname_decls ();
2761 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2762 decl, NAME is the initialization string and TYPE_DEP indicates whether
2763 NAME depended on the type of the function. As we don't yet implement
2764 delayed emission of static data, we mark the decl as emitted
2765 so it is not placed in the output. Anything using it must therefore pull
2766 out the STRING_CST initializer directly. FIXME. */
2769 c_make_fname_decl (tree id
, int type_dep
)
2771 const char *name
= fname_as_string (type_dep
);
2772 tree decl
, type
, init
;
2773 size_t length
= strlen (name
);
2775 type
= build_array_type (char_type_node
,
2776 build_index_type (size_int (length
)));
2777 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
2779 decl
= build_decl (VAR_DECL
, id
, type
);
2781 TREE_STATIC (decl
) = 1;
2782 TREE_READONLY (decl
) = 1;
2783 DECL_ARTIFICIAL (decl
) = 1;
2785 init
= build_string (length
+ 1, name
);
2786 free (CONST_CAST (char *, name
));
2787 TREE_TYPE (init
) = type
;
2788 DECL_INITIAL (decl
) = init
;
2790 TREE_USED (decl
) = 1;
2792 if (current_function_decl
2793 /* For invalid programs like this:
2796 const char* p = __FUNCTION__;
2798 the __FUNCTION__ is believed to appear in K&R style function
2799 parameter declarator. In that case we still don't have
2801 && (!errorcount
|| current_function_scope
))
2803 DECL_CONTEXT (decl
) = current_function_decl
;
2804 bind (id
, decl
, current_function_scope
,
2805 /*invisible=*/false, /*nested=*/false);
2808 finish_decl (decl
, init
, NULL_TREE
);
2814 c_builtin_function (tree decl
)
2816 tree type
= TREE_TYPE (decl
);
2817 tree id
= DECL_NAME (decl
);
2819 const char *name
= IDENTIFIER_POINTER (id
);
2820 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
2822 /* Should never be called on a symbol with a preexisting meaning. */
2823 gcc_assert (!I_SYMBOL_BINDING (id
));
2825 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false);
2827 /* Builtins in the implementation namespace are made visible without
2828 needing to be explicitly declared. See push_file_scope. */
2829 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2831 TREE_CHAIN (decl
) = visible_builtins
;
2832 visible_builtins
= decl
;
2839 c_builtin_function_ext_scope (tree decl
)
2841 tree type
= TREE_TYPE (decl
);
2842 tree id
= DECL_NAME (decl
);
2844 const char *name
= IDENTIFIER_POINTER (id
);
2845 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
2847 /* Should never be called on a symbol with a preexisting meaning. */
2848 gcc_assert (!I_SYMBOL_BINDING (id
));
2850 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false);
2852 /* Builtins in the implementation namespace are made visible without
2853 needing to be explicitly declared. See push_file_scope. */
2854 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2856 TREE_CHAIN (decl
) = visible_builtins
;
2857 visible_builtins
= decl
;
2863 /* Called when a declaration is seen that contains no names to declare.
2864 If its type is a reference to a structure, union or enum inherited
2865 from a containing scope, shadow that tag name for the current scope
2866 with a forward reference.
2867 If its type defines a new named structure or union
2868 or defines an enum, it is valid but we need not do anything here.
2869 Otherwise, it is an error. */
2872 shadow_tag (const struct c_declspecs
*declspecs
)
2874 shadow_tag_warned (declspecs
, 0);
2877 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2880 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
2882 bool found_tag
= false;
2884 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
2886 tree value
= declspecs
->type
;
2887 enum tree_code code
= TREE_CODE (value
);
2889 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2890 /* Used to test also that TYPE_SIZE (value) != 0.
2891 That caused warning for `struct foo;' at top level in the file. */
2893 tree name
= TYPE_NAME (value
);
2900 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2901 /* Empty unnamed enum OK */
2903 pedwarn (input_location
, 0,
2904 "unnamed struct/union that defines no instances");
2908 else if (!declspecs
->tag_defined_p
2909 && declspecs
->storage_class
!= csc_none
)
2912 pedwarn (input_location
, 0,
2913 "empty declaration with storage class specifier "
2914 "does not redeclare tag");
2916 pending_xref_error ();
2918 else if (!declspecs
->tag_defined_p
2919 && (declspecs
->const_p
2920 || declspecs
->volatile_p
2921 || declspecs
->restrict_p
))
2924 pedwarn (input_location
, 0,
2925 "empty declaration with type qualifier "
2926 "does not redeclare tag");
2928 pending_xref_error ();
2932 pending_invalid_xref
= 0;
2933 t
= lookup_tag (code
, name
, 1);
2937 t
= make_node (code
);
2944 if (warned
!= 1 && !in_system_header
)
2946 pedwarn (input_location
, 0,
2947 "useless type name in empty declaration");
2952 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
2954 pedwarn (input_location
, 0, "useless type name in empty declaration");
2958 pending_invalid_xref
= 0;
2960 if (declspecs
->inline_p
)
2962 error ("%<inline%> in empty declaration");
2966 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
2968 error ("%<auto%> in file-scope empty declaration");
2972 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
2974 error ("%<register%> in file-scope empty declaration");
2978 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
2980 warning (0, "useless storage class specifier in empty declaration");
2984 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
2986 warning (0, "useless %<__thread%> in empty declaration");
2990 if (!warned
&& !in_system_header
&& (declspecs
->const_p
2991 || declspecs
->volatile_p
2992 || declspecs
->restrict_p
))
2994 warning (0, "useless type qualifier in empty declaration");
3001 pedwarn (input_location
, 0, "empty declaration");
3006 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3007 bits. SPECS represents declaration specifiers that the grammar
3008 only permits to contain type qualifiers and attributes. */
3011 quals_from_declspecs (const struct c_declspecs
*specs
)
3013 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3014 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3015 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0));
3016 gcc_assert (!specs
->type
3017 && !specs
->decl_attr
3018 && specs
->typespec_word
== cts_none
3019 && specs
->storage_class
== csc_none
3020 && !specs
->typedef_p
3021 && !specs
->explicit_signed_p
3022 && !specs
->deprecated_p
3024 && !specs
->long_long_p
3027 && !specs
->unsigned_p
3028 && !specs
->complex_p
3030 && !specs
->thread_p
);
3034 /* Construct an array declarator. EXPR is the expression inside [],
3035 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3036 applied to the pointer to which a parameter array is converted).
3037 STATIC_P is true if "static" is inside the [], false otherwise.
3038 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3039 length which is nevertheless a complete type, false otherwise. The
3040 field for the contained declarator is left to be filled in by
3041 set_array_declarator_inner. */
3043 struct c_declarator
*
3044 build_array_declarator (tree expr
, struct c_declspecs
*quals
, bool static_p
,
3047 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3048 struct c_declarator
);
3049 declarator
->kind
= cdk_array
;
3050 declarator
->declarator
= 0;
3051 declarator
->u
.array
.dimen
= expr
;
3054 declarator
->u
.array
.attrs
= quals
->attrs
;
3055 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3059 declarator
->u
.array
.attrs
= NULL_TREE
;
3060 declarator
->u
.array
.quals
= 0;
3062 declarator
->u
.array
.static_p
= static_p
;
3063 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3066 if (static_p
|| quals
!= NULL
)
3067 pedwarn (input_location
, OPT_pedantic
,
3068 "ISO C90 does not support %<static%> or type "
3069 "qualifiers in parameter array declarators");
3071 pedwarn (input_location
, OPT_pedantic
,
3072 "ISO C90 does not support %<[*]%> array declarators");
3076 if (!current_scope
->parm_flag
)
3079 error ("%<[*]%> not allowed in other than function prototype scope");
3080 declarator
->u
.array
.vla_unspec_p
= false;
3083 current_scope
->had_vla_unspec
= true;
3088 /* Set the contained declarator of an array declarator. DECL is the
3089 declarator, as constructed by build_array_declarator; INNER is what
3090 appears on the left of the []. */
3092 struct c_declarator
*
3093 set_array_declarator_inner (struct c_declarator
*decl
,
3094 struct c_declarator
*inner
)
3096 decl
->declarator
= inner
;
3100 /* INIT is a constructor that forms DECL's initializer. If the final
3101 element initializes a flexible array field, add the size of that
3102 initializer to DECL's size. */
3105 add_flexible_array_elts_to_size (tree decl
, tree init
)
3109 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3112 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3113 type
= TREE_TYPE (elt
);
3114 if (TREE_CODE (type
) == ARRAY_TYPE
3115 && TYPE_SIZE (type
) == NULL_TREE
3116 && TYPE_DOMAIN (type
) != NULL_TREE
3117 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3119 complete_array_type (&type
, elt
, false);
3121 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3122 DECL_SIZE_UNIT (decl
)
3123 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3127 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3130 groktypename (struct c_type_name
*type_name
)
3133 tree attrs
= type_name
->specs
->attrs
;
3135 type_name
->specs
->attrs
= NULL_TREE
;
3137 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3138 false, NULL
, &attrs
, DEPRECATED_NORMAL
);
3140 /* Apply attributes. */
3141 decl_attributes (&type
, attrs
, 0);
3146 /* Decode a declarator in an ordinary declaration or data definition.
3147 This is called as soon as the type information and variable name
3148 have been parsed, before parsing the initializer if any.
3149 Here we create the ..._DECL node, fill in its type,
3150 and put it on the list of decls for the current context.
3151 The ..._DECL node is returned as the value.
3153 Exception: for arrays where the length is not specified,
3154 the type is left null, to be filled in by `finish_decl'.
3156 Function definitions do not come here; they go to start_function
3157 instead. However, external and forward declarations of functions
3158 do go through here. Structure field declarations are done by
3159 grokfield and not through here. */
3162 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3163 bool initialized
, tree attributes
)
3167 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3169 /* An object declared as __attribute__((deprecated)) suppresses
3170 warnings of uses of other deprecated items. */
3171 if (lookup_attribute ("deprecated", attributes
))
3172 deprecated_state
= DEPRECATED_SUPPRESS
;
3174 decl
= grokdeclarator (declarator
, declspecs
,
3175 NORMAL
, initialized
, NULL
, &attributes
,
3180 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3181 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3184 /* Is it valid for this decl to have an initializer at all?
3185 If not, set INITIALIZED to zero, which will indirectly
3186 tell 'finish_decl' to ignore the initializer once it is parsed. */
3187 switch (TREE_CODE (decl
))
3190 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3195 error ("function %qD is initialized like a variable", decl
);
3200 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3201 error ("parameter %qD is initialized", decl
);
3206 /* Don't allow initializations for incomplete types except for
3207 arrays which might be completed by the initialization. */
3209 /* This can happen if the array size is an undefined macro.
3210 We already gave a warning, so we don't need another one. */
3211 if (TREE_TYPE (decl
) == error_mark_node
)
3213 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3215 /* A complete type is ok if size is fixed. */
3217 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3218 || C_DECL_VARIABLE_SIZE (decl
))
3220 error ("variable-sized object may not be initialized");
3224 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3226 error ("variable %qD has initializer but incomplete type", decl
);
3229 else if (C_DECL_VARIABLE_SIZE (decl
))
3231 /* Although C99 is unclear about whether incomplete arrays
3232 of VLAs themselves count as VLAs, it does not make
3233 sense to permit them to be initialized given that
3234 ordinary VLAs may not be initialized. */
3235 error ("variable-sized object may not be initialized");
3242 if (current_scope
== file_scope
)
3243 TREE_STATIC (decl
) = 1;
3245 /* Tell 'pushdecl' this is an initialized decl
3246 even though we don't yet have the initializer expression.
3247 Also tell 'finish_decl' it may store the real initializer. */
3248 DECL_INITIAL (decl
) = error_mark_node
;
3251 /* If this is a function declaration, write a record describing it to the
3252 prototypes file (if requested). */
3254 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3255 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3257 /* ANSI specifies that a tentative definition which is not merged with
3258 a non-tentative definition behaves exactly like a definition with an
3259 initializer equal to zero. (Section 3.7.2)
3261 -fno-common gives strict ANSI behavior, though this tends to break
3262 a large body of code that grew up without this rule.
3264 Thread-local variables are never common, since there's no entrenched
3265 body of code to break, and it allows more efficient variable references
3266 in the presence of dynamic linking. */
3268 if (TREE_CODE (decl
) == VAR_DECL
3270 && TREE_PUBLIC (decl
)
3271 && !DECL_THREAD_LOCAL_P (decl
)
3273 DECL_COMMON (decl
) = 1;
3275 /* Set attributes here so if duplicate decl, will have proper attributes. */
3276 decl_attributes (&decl
, attributes
, 0);
3278 /* Handle gnu_inline attribute. */
3279 if (declspecs
->inline_p
3280 && !flag_gnu89_inline
3281 && TREE_CODE (decl
) == FUNCTION_DECL
3282 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
3283 || current_function_decl
))
3285 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
3287 else if (declspecs
->storage_class
!= csc_static
)
3288 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
3291 if (TREE_CODE (decl
) == FUNCTION_DECL
3292 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3294 struct c_declarator
*ce
= declarator
;
3296 if (ce
->kind
== cdk_pointer
)
3297 ce
= declarator
->declarator
;
3298 if (ce
->kind
== cdk_function
)
3300 tree args
= ce
->u
.arg_info
->parms
;
3301 for (; args
; args
= TREE_CHAIN (args
))
3303 tree type
= TREE_TYPE (args
);
3304 if (type
&& INTEGRAL_TYPE_P (type
)
3305 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3306 DECL_ARG_TYPE (args
) = integer_type_node
;
3311 if (TREE_CODE (decl
) == FUNCTION_DECL
3312 && DECL_DECLARED_INLINE_P (decl
)
3313 && DECL_UNINLINABLE (decl
)
3314 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3315 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
3318 /* C99 6.7.4p3: An inline definition of a function with external
3319 linkage shall not contain a definition of a modifiable object
3320 with static storage duration... */
3321 if (TREE_CODE (decl
) == VAR_DECL
3322 && current_scope
!= file_scope
3323 && TREE_STATIC (decl
)
3324 && !TREE_READONLY (decl
)
3325 && DECL_DECLARED_INLINE_P (current_function_decl
)
3326 && DECL_EXTERNAL (current_function_decl
))
3327 pedwarn (input_location
, 0,
3328 "%q+D is static but declared in inline function %qD "
3329 "which is not static", decl
, current_function_decl
);
3331 /* Add this decl to the current scope.
3332 TEM may equal DECL or it may be a previous decl of the same name. */
3333 tem
= pushdecl (decl
);
3335 if (initialized
&& DECL_EXTERNAL (tem
))
3337 DECL_EXTERNAL (tem
) = 0;
3338 TREE_STATIC (tem
) = 1;
3344 /* Initialize EH if not initialized yet and exceptions are enabled. */
3347 c_maybe_initialize_eh (void)
3349 if (!flag_exceptions
|| c_eh_initialized_p
)
3352 c_eh_initialized_p
= true;
3353 eh_personality_libfunc
3354 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3355 ? "__gcc_personality_sj0"
3356 : "__gcc_personality_v0");
3357 default_init_unwind_resume_libfunc ();
3358 using_eh_for_cleanups ();
3361 /* Finish processing of a declaration;
3362 install its initial value.
3363 If the length of an array type is not known before,
3364 it must be determined now, from the initial value, or it is an error. */
3367 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3370 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3371 const char *asmspec
= 0;
3373 /* If a name was specified, get the string. */
3374 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
3375 && DECL_FILE_SCOPE_P (decl
))
3376 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3378 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3380 /* If `start_decl' didn't like having an initialization, ignore it now. */
3381 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3384 /* Don't crash if parm is initialized. */
3385 if (TREE_CODE (decl
) == PARM_DECL
)
3389 store_init_value (decl
, init
);
3391 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3392 || TREE_CODE (decl
) == FUNCTION_DECL
3393 || TREE_CODE (decl
) == FIELD_DECL
))
3394 objc_check_decl (decl
);
3396 type
= TREE_TYPE (decl
);
3398 /* Deduce size of array from initialization, if not already known. */
3399 if (TREE_CODE (type
) == ARRAY_TYPE
3400 && TYPE_DOMAIN (type
) == 0
3401 && TREE_CODE (decl
) != TYPE_DECL
)
3404 = (TREE_STATIC (decl
)
3405 /* Even if pedantic, an external linkage array
3406 may have incomplete type at first. */
3407 ? pedantic
&& !TREE_PUBLIC (decl
)
3408 : !DECL_EXTERNAL (decl
));
3410 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
3413 /* Get the completed type made by complete_array_type. */
3414 type
= TREE_TYPE (decl
);
3419 error ("initializer fails to determine size of %q+D", decl
);
3424 error ("array size missing in %q+D", decl
);
3425 /* If a `static' var's size isn't known,
3426 make it extern as well as static, so it does not get
3428 If it is not `static', then do not mark extern;
3429 finish_incomplete_decl will give it a default size
3430 and it will get allocated. */
3431 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
3432 DECL_EXTERNAL (decl
) = 1;
3436 error ("zero or negative size array %q+D", decl
);
3440 /* For global variables, update the copy of the type that
3441 exists in the binding. */
3442 if (TREE_PUBLIC (decl
))
3444 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
3445 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
3446 b_ext
= b_ext
->shadowed
;
3450 b_ext
->type
= composite_type (b_ext
->type
, type
);
3461 if (DECL_INITIAL (decl
))
3462 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3464 layout_decl (decl
, 0);
3467 if (TREE_CODE (decl
) == VAR_DECL
)
3469 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
3470 add_flexible_array_elts_to_size (decl
, init
);
3472 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3473 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3474 layout_decl (decl
, 0);
3476 if (DECL_SIZE (decl
) == 0
3477 /* Don't give an error if we already gave one earlier. */
3478 && TREE_TYPE (decl
) != error_mark_node
3479 && (TREE_STATIC (decl
)
3480 /* A static variable with an incomplete type
3481 is an error if it is initialized.
3482 Also if it is not file scope.
3483 Otherwise, let it through, but if it is not `extern'
3484 then it may cause an error message later. */
3485 ? (DECL_INITIAL (decl
) != 0
3486 || !DECL_FILE_SCOPE_P (decl
))
3487 /* An automatic variable with an incomplete type
3489 : !DECL_EXTERNAL (decl
)))
3491 error ("storage size of %q+D isn%'t known", decl
);
3492 TREE_TYPE (decl
) = error_mark_node
;
3495 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3496 && DECL_SIZE (decl
) != 0)
3498 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3499 constant_expression_warning (DECL_SIZE (decl
));
3502 error ("storage size of %q+D isn%'t constant", decl
);
3503 TREE_TYPE (decl
) = error_mark_node
;
3507 if (TREE_USED (type
))
3508 TREE_USED (decl
) = 1;
3511 /* If this is a function and an assembler name is specified, reset DECL_RTL
3512 so we can give it its new name. Also, update built_in_decls if it
3513 was a normal built-in. */
3514 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3516 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3517 set_builtin_user_assembler_name (decl
, asmspec
);
3518 set_user_assembler_name (decl
, asmspec
);
3521 /* If #pragma weak was used, mark the decl weak now. */
3522 maybe_apply_pragma_weak (decl
);
3524 /* Output the assembler code and/or RTL code for variables and functions,
3525 unless the type is an undefined structure or union.
3526 If not, it will get done when the type is completed. */
3528 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3530 /* Determine the ELF visibility. */
3531 if (TREE_PUBLIC (decl
))
3532 c_determine_visibility (decl
);
3534 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3535 if (c_dialect_objc ())
3536 objc_check_decl (decl
);
3540 /* If this is not a static variable, issue a warning.
3541 It doesn't make any sense to give an ASMSPEC for an
3542 ordinary, non-register local variable. Historically,
3543 GCC has accepted -- but ignored -- the ASMSPEC in
3545 if (!DECL_FILE_SCOPE_P (decl
)
3546 && TREE_CODE (decl
) == VAR_DECL
3547 && !C_DECL_REGISTER (decl
)
3548 && !TREE_STATIC (decl
))
3549 warning (0, "ignoring asm-specifier for non-static local "
3550 "variable %q+D", decl
);
3552 set_user_assembler_name (decl
, asmspec
);
3555 if (DECL_FILE_SCOPE_P (decl
))
3557 if (DECL_INITIAL (decl
) == NULL_TREE
3558 || DECL_INITIAL (decl
) == error_mark_node
)
3559 /* Don't output anything
3560 when a tentative file-scope definition is seen.
3561 But at end of compilation, do output code for them. */
3562 DECL_DEFER_OUTPUT (decl
) = 1;
3563 rest_of_decl_compilation (decl
, true, 0);
3567 /* In conjunction with an ASMSPEC, the `register'
3568 keyword indicates that we should place the variable
3569 in a particular register. */
3570 if (asmspec
&& C_DECL_REGISTER (decl
))
3572 DECL_HARD_REGISTER (decl
) = 1;
3573 /* This cannot be done for a structure with volatile
3574 fields, on which DECL_REGISTER will have been
3576 if (!DECL_REGISTER (decl
))
3577 error ("cannot put object with volatile field into register");
3580 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3582 /* If we're building a variable sized type, and we might be
3583 reachable other than via the top of the current binding
3584 level, then create a new BIND_EXPR so that we deallocate
3585 the object at the right time. */
3586 /* Note that DECL_SIZE can be null due to errors. */
3587 if (DECL_SIZE (decl
)
3588 && !TREE_CONSTANT (DECL_SIZE (decl
))
3589 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3592 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3593 TREE_SIDE_EFFECTS (bind
) = 1;
3595 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3597 add_stmt (build_stmt (DECL_EXPR
, decl
));
3602 if (!DECL_FILE_SCOPE_P (decl
))
3604 /* Recompute the RTL of a local array now
3605 if it used to be an incomplete type. */
3607 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
3609 /* If we used it already as memory, it must stay in memory. */
3610 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3611 /* If it's still incomplete now, no init will save it. */
3612 if (DECL_SIZE (decl
) == 0)
3613 DECL_INITIAL (decl
) = 0;
3618 if (TREE_CODE (decl
) == TYPE_DECL
)
3620 if (!DECL_FILE_SCOPE_P (decl
)
3621 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3622 add_stmt (build_stmt (DECL_EXPR
, decl
));
3624 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3627 /* At the end of a declaration, throw away any variable type sizes
3628 of types defined inside that declaration. There is no use
3629 computing them in the following function definition. */
3630 if (current_scope
== file_scope
)
3631 get_pending_sizes ();
3633 /* Install a cleanup (aka destructor) if one was given. */
3634 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3636 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3639 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3640 tree cleanup_decl
= lookup_name (cleanup_id
);
3643 /* Build "cleanup(&decl)" for the destructor. */
3644 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
3645 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3646 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3648 /* Don't warn about decl unused; the cleanup uses it. */
3649 TREE_USED (decl
) = 1;
3650 TREE_USED (cleanup_decl
) = 1;
3652 /* Initialize EH, if we've been told to do so. */
3653 c_maybe_initialize_eh ();
3655 push_cleanup (decl
, cleanup
, false);
3660 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3663 grokparm (const struct c_parm
*parm
)
3665 tree attrs
= parm
->attrs
;
3666 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
3667 NULL
, &attrs
, DEPRECATED_NORMAL
);
3669 decl_attributes (&decl
, attrs
, 0);
3674 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3675 and push that on the current scope. */
3678 push_parm_decl (const struct c_parm
*parm
)
3680 tree attrs
= parm
->attrs
;
3683 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
3684 &attrs
, DEPRECATED_NORMAL
);
3685 decl_attributes (&decl
, attrs
, 0);
3687 decl
= pushdecl (decl
);
3689 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3692 /* Mark all the parameter declarations to date as forward decls.
3693 Also diagnose use of this extension. */
3696 mark_forward_parm_decls (void)
3698 struct c_binding
*b
;
3700 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3702 pedwarn (input_location
, OPT_pedantic
,
3703 "ISO C forbids forward parameter declarations");
3704 current_scope
->warned_forward_parm_decls
= true;
3707 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3708 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3709 TREE_ASM_WRITTEN (b
->decl
) = 1;
3712 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3713 literal, which may be an incomplete array type completed by the
3714 initializer; INIT is a CONSTRUCTOR that initializes the compound
3718 build_compound_literal (tree type
, tree init
)
3720 /* We do not use start_decl here because we have a type, not a declarator;
3721 and do not use finish_decl because the decl should be stored inside
3722 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3727 if (type
== error_mark_node
)
3728 return error_mark_node
;
3730 decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3731 DECL_EXTERNAL (decl
) = 0;
3732 TREE_PUBLIC (decl
) = 0;
3733 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3734 DECL_CONTEXT (decl
) = current_function_decl
;
3735 TREE_USED (decl
) = 1;
3736 TREE_TYPE (decl
) = type
;
3737 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3738 store_init_value (decl
, init
);
3740 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3742 int failure
= complete_array_type (&TREE_TYPE (decl
),
3743 DECL_INITIAL (decl
), true);
3744 gcc_assert (!failure
);
3746 type
= TREE_TYPE (decl
);
3747 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3750 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3751 return error_mark_node
;
3753 stmt
= build_stmt (DECL_EXPR
, decl
);
3754 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
3755 TREE_SIDE_EFFECTS (complit
) = 1;
3757 layout_decl (decl
, 0);
3759 if (TREE_STATIC (decl
))
3761 /* This decl needs a name for the assembler output. */
3762 set_compound_literal_name (decl
);
3763 DECL_DEFER_OUTPUT (decl
) = 1;
3764 DECL_COMDAT (decl
) = 1;
3765 DECL_ARTIFICIAL (decl
) = 1;
3766 DECL_IGNORED_P (decl
) = 1;
3768 rest_of_decl_compilation (decl
, 1, 0);
3774 /* Determine whether TYPE is a structure with a flexible array member,
3775 or a union containing such a structure (possibly recursively). */
3778 flexible_array_type_p (tree type
)
3781 switch (TREE_CODE (type
))
3784 x
= TYPE_FIELDS (type
);
3787 while (TREE_CHAIN (x
) != NULL_TREE
)
3789 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3790 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3791 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3792 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3796 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3798 if (flexible_array_type_p (TREE_TYPE (x
)))
3807 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3808 replacing with appropriate values if they are invalid. */
3810 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3813 unsigned int max_width
;
3814 unsigned HOST_WIDE_INT w
;
3815 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3817 /* Detect and ignore out of range field width and process valid
3819 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
))
3820 || TREE_CODE (*width
) != INTEGER_CST
)
3822 error ("bit-field %qs width not an integer constant", name
);
3823 *width
= integer_one_node
;
3827 constant_expression_warning (*width
);
3828 if (tree_int_cst_sgn (*width
) < 0)
3830 error ("negative width in bit-field %qs", name
);
3831 *width
= integer_one_node
;
3833 else if (integer_zerop (*width
) && orig_name
)
3835 error ("zero width for bit-field %qs", name
);
3836 *width
= integer_one_node
;
3840 /* Detect invalid bit-field type. */
3841 if (TREE_CODE (*type
) != INTEGER_TYPE
3842 && TREE_CODE (*type
) != BOOLEAN_TYPE
3843 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3845 error ("bit-field %qs has invalid type", name
);
3846 *type
= unsigned_type_node
;
3849 type_mv
= TYPE_MAIN_VARIANT (*type
);
3850 if (!in_system_header
3851 && type_mv
!= integer_type_node
3852 && type_mv
!= unsigned_type_node
3853 && type_mv
!= boolean_type_node
)
3854 pedwarn (input_location
, OPT_pedantic
,
3855 "type of bit-field %qs is a GCC extension", name
);
3857 max_width
= TYPE_PRECISION (*type
);
3859 if (0 < compare_tree_int (*width
, max_width
))
3861 error ("width of %qs exceeds its type", name
);
3863 *width
= build_int_cst (NULL_TREE
, w
);
3866 w
= tree_low_cst (*width
, 1);
3868 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3870 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3872 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3873 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3874 warning (0, "%qs is narrower than values of its type", name
);
3880 /* Print warning about variable length array if necessary. */
3883 warn_variable_length_array (const char *name
, tree size
)
3885 int const_size
= TREE_CONSTANT (size
);
3887 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
3892 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array %qs whose size "
3893 "can%'t be evaluated",
3896 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
3897 "can%'t be evaluated");
3902 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array %qs",
3905 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
3908 else if (warn_vla
> 0)
3914 "the size of array %qs can"
3915 "%'t be evaluated", name
);
3918 "the size of array can %'t be evaluated");
3924 "variable length array %qs is used",
3928 "variable length array is used");
3933 /* Given declspecs and a declarator,
3934 determine the name and type of the object declared
3935 and construct a ..._DECL node for it.
3936 (In one case we can return a ..._TYPE node instead.
3937 For invalid input we sometimes return 0.)
3939 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3941 DECL_CONTEXT says which syntactic context this declaration is in:
3942 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3943 FUNCDEF for a function definition. Like NORMAL but a few different
3944 error messages in each case. Return value may be zero meaning
3945 this definition is too screwy to try to parse.
3946 PARM for a parameter declaration (either within a function prototype
3947 or before a function body). Make a PARM_DECL, or return void_type_node.
3948 TYPENAME if for a typename (in a cast or sizeof).
3949 Don't make a DECL node; just return the ..._TYPE node.
3950 FIELD for a struct or union field; make a FIELD_DECL.
3951 INITIALIZED is true if the decl has an initializer.
3952 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3953 representing the width of the bit-field.
3954 DECL_ATTRS points to the list of attributes that should be added to this
3955 decl. Any nested attributes that belong on the decl itself will be
3957 DEPRECATED_STATE is a deprecated_states value indicating whether
3958 deprecation warnings should be suppressed.
3960 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3961 It may also be so in the PARM case, for a prototype where the
3962 argument type is specified but not the name.
3964 This function is where the complicated C meanings of `static'
3965 and `extern' are interpreted. */
3968 grokdeclarator (const struct c_declarator
*declarator
,
3969 struct c_declspecs
*declspecs
,
3970 enum decl_context decl_context
, bool initialized
, tree
*width
,
3971 tree
*decl_attrs
, enum deprecated_states deprecated_state
)
3973 tree type
= declspecs
->type
;
3974 bool threadp
= declspecs
->thread_p
;
3975 enum c_storage_class storage_class
= declspecs
->storage_class
;
3979 int type_quals
= TYPE_UNQUALIFIED
;
3980 const char *name
, *orig_name
;
3981 bool funcdef_flag
= false;
3982 bool funcdef_syntax
= false;
3983 int size_varies
= 0;
3984 tree decl_attr
= declspecs
->decl_attr
;
3985 int array_ptr_quals
= TYPE_UNQUALIFIED
;
3986 tree array_ptr_attrs
= NULL_TREE
;
3987 int array_parm_static
= 0;
3988 bool array_parm_vla_unspec_p
= false;
3989 tree returned_attrs
= NULL_TREE
;
3990 bool bitfield
= width
!= NULL
;
3992 struct c_arg_info
*arg_info
= 0;
3994 if (decl_context
== FUNCDEF
)
3995 funcdef_flag
= true, decl_context
= NORMAL
;
3997 /* Look inside a declarator for the name being declared
3998 and get it as a string, for an error message. */
4000 const struct c_declarator
*decl
= declarator
;
4009 funcdef_syntax
= (decl
->kind
== cdk_function
);
4010 decl
= decl
->declarator
;
4014 decl
= decl
->declarator
;
4019 name
= IDENTIFIER_POINTER (decl
->u
.id
);
4031 /* A function definition's declarator must have the form of
4032 a function declarator. */
4034 if (funcdef_flag
&& !funcdef_syntax
)
4037 /* If this looks like a function definition, make it one,
4038 even if it occurs where parms are expected.
4039 Then store_parm_decls will reject it and not use it as a parm. */
4040 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4041 decl_context
= PARM
;
4043 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4044 warn_deprecated_use (declspecs
->type
);
4046 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4047 && current_scope
== file_scope
4048 && variably_modified_type_p (type
, NULL_TREE
))
4050 error ("variably modified %qs at file scope", name
);
4051 type
= integer_type_node
;
4054 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4056 /* Diagnose defaulting to "int". */
4058 if (declspecs
->default_int_p
&& !in_system_header
)
4060 /* Issue a warning if this is an ISO C 99 program or if
4061 -Wreturn-type and this is a function, or if -Wimplicit;
4062 prefer the former warning since it is more explicit. */
4063 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4065 warn_about_return_type
= 1;
4067 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4068 "type defaults to %<int%> in declaration of %qs", name
);
4071 /* Adjust the type if a bit-field is being declared,
4072 -funsigned-bitfields applied and the type is not explicitly
4074 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4075 && TREE_CODE (type
) == INTEGER_TYPE
)
4076 type
= unsigned_type_for (type
);
4078 /* Figure out the type qualifiers for the declaration. There are
4079 two ways a declaration can become qualified. One is something
4080 like `const int i' where the `const' is explicit. Another is
4081 something like `typedef const int CI; CI i' where the type of the
4082 declaration contains the `const'. A third possibility is that
4083 there is a type qualifier on the element type of a typedefed
4084 array type, in which case we should extract that qualifier so
4085 that c_apply_type_quals_to_decl receives the full list of
4086 qualifiers to work with (C90 is not entirely clear about whether
4087 duplicate qualifiers should be diagnosed in this case, but it
4088 seems most appropriate to do so). */
4089 element_type
= strip_array_types (type
);
4090 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4091 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4092 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4093 if (pedantic
&& !flag_isoc99
)
4096 pedwarn (input_location
, OPT_pedantic
, "duplicate %<const%>");
4098 pedwarn (input_location
, OPT_pedantic
, "duplicate %<restrict%>");
4100 pedwarn (input_location
, OPT_pedantic
, "duplicate %<volatile%>");
4102 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
4103 type
= TYPE_MAIN_VARIANT (type
);
4104 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4105 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4106 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4108 /* Warn about storage classes that are invalid for certain
4109 kinds of declarations (parameters, typenames, etc.). */
4113 || storage_class
== csc_auto
4114 || storage_class
== csc_register
4115 || storage_class
== csc_typedef
))
4117 if (storage_class
== csc_auto
)
4118 pedwarn (input_location
,
4119 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
4120 "function definition declared %<auto%>");
4121 if (storage_class
== csc_register
)
4122 error ("function definition declared %<register%>");
4123 if (storage_class
== csc_typedef
)
4124 error ("function definition declared %<typedef%>");
4126 error ("function definition declared %<__thread%>");
4128 if (storage_class
== csc_auto
4129 || storage_class
== csc_register
4130 || storage_class
== csc_typedef
)
4131 storage_class
= csc_none
;
4133 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
4135 if (decl_context
== PARM
&& storage_class
== csc_register
)
4139 switch (decl_context
)
4142 error ("storage class specified for structure field %qs",
4146 error ("storage class specified for parameter %qs", name
);
4149 error ("storage class specified for typename");
4152 storage_class
= csc_none
;
4156 else if (storage_class
== csc_extern
4160 /* 'extern' with initialization is invalid if not at file scope. */
4161 if (current_scope
== file_scope
)
4163 /* It is fine to have 'extern const' when compiling at C
4164 and C++ intersection. */
4165 if (!(warn_cxx_compat
&& constp
))
4166 warning (0, "%qs initialized and declared %<extern%>", name
);
4169 error ("%qs has both %<extern%> and initializer", name
);
4171 else if (current_scope
== file_scope
)
4173 if (storage_class
== csc_auto
)
4174 error ("file-scope declaration of %qs specifies %<auto%>", name
);
4175 if (pedantic
&& storage_class
== csc_register
)
4176 pedwarn (input_location
, OPT_pedantic
,
4177 "file-scope declaration of %qs specifies %<register%>", name
);
4181 if (storage_class
== csc_extern
&& funcdef_flag
)
4182 error ("nested function %qs declared %<extern%>", name
);
4183 else if (threadp
&& storage_class
== csc_none
)
4185 error ("function-scope %qs implicitly auto and declared "
4192 /* Now figure out the structure of the declarator proper.
4193 Descend through it, creating more complex types, until we reach
4194 the declared identifier (or NULL_TREE, in an absolute declarator).
4195 At each stage we maintain an unqualified version of the type
4196 together with any qualifiers that should be applied to it with
4197 c_build_qualified_type; this way, array types including
4198 multidimensional array types are first built up in unqualified
4199 form and then the qualified form is created with
4200 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4202 while (declarator
&& declarator
->kind
!= cdk_id
)
4204 if (type
== error_mark_node
)
4206 declarator
= declarator
->declarator
;
4210 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4211 a cdk_pointer (for *...),
4212 a cdk_function (for ...(...)),
4213 a cdk_attrs (for nested attributes),
4214 or a cdk_id (for the name being declared
4215 or the place in an absolute declarator
4216 where the name was omitted).
4217 For the last case, we have just exited the loop.
4219 At this point, TYPE is the type of elements of an array,
4220 or for a function to return, or for a pointer to point to.
4221 After this sequence of ifs, TYPE is the type of the
4222 array or function or pointer, and DECLARATOR has had its
4223 outermost layer removed. */
4225 if (array_ptr_quals
!= TYPE_UNQUALIFIED
4226 || array_ptr_attrs
!= NULL_TREE
4227 || array_parm_static
)
4229 /* Only the innermost declarator (making a parameter be of
4230 array type which is converted to pointer type)
4231 may have static or type qualifiers. */
4232 error ("static or type qualifiers in non-parameter array declarator");
4233 array_ptr_quals
= TYPE_UNQUALIFIED
;
4234 array_ptr_attrs
= NULL_TREE
;
4235 array_parm_static
= 0;
4238 switch (declarator
->kind
)
4242 /* A declarator with embedded attributes. */
4243 tree attrs
= declarator
->u
.attrs
;
4244 const struct c_declarator
*inner_decl
;
4246 declarator
= declarator
->declarator
;
4247 inner_decl
= declarator
;
4248 while (inner_decl
->kind
== cdk_attrs
)
4249 inner_decl
= inner_decl
->declarator
;
4250 if (inner_decl
->kind
== cdk_id
)
4251 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
4252 else if (inner_decl
->kind
== cdk_function
)
4253 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
4254 else if (inner_decl
->kind
== cdk_array
)
4255 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
4256 returned_attrs
= decl_attributes (&type
,
4257 chainon (returned_attrs
, attrs
),
4263 tree itype
= NULL_TREE
;
4264 tree size
= declarator
->u
.array
.dimen
;
4265 /* The index is a signed object `sizetype' bits wide. */
4266 tree index_type
= c_common_signed_type (sizetype
);
4268 array_ptr_quals
= declarator
->u
.array
.quals
;
4269 array_ptr_attrs
= declarator
->u
.array
.attrs
;
4270 array_parm_static
= declarator
->u
.array
.static_p
;
4271 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
4273 declarator
= declarator
->declarator
;
4275 /* Check for some types that there cannot be arrays of. */
4277 if (VOID_TYPE_P (type
))
4279 error ("declaration of %qs as array of voids", name
);
4280 type
= error_mark_node
;
4283 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4285 error ("declaration of %qs as array of functions", name
);
4286 type
= error_mark_node
;
4289 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
4290 pedwarn (input_location
, OPT_pedantic
,
4291 "invalid use of structure with flexible array member");
4293 if (size
== error_mark_node
)
4294 type
= error_mark_node
;
4296 if (type
== error_mark_node
)
4299 /* If size was specified, set ITYPE to a range-type for
4300 that size. Otherwise, ITYPE remains null. finish_decl
4301 may figure it out from an initial value. */
4305 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4307 STRIP_TYPE_NOPS (size
);
4309 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4311 error ("size of array %qs has non-integer type", name
);
4312 size
= integer_one_node
;
4315 if (pedantic
&& integer_zerop (size
))
4316 pedwarn (input_location
, OPT_pedantic
,
4317 "ISO C forbids zero-size array %qs", name
);
4319 if (TREE_CODE (size
) == INTEGER_CST
)
4321 constant_expression_warning (size
);
4322 if (tree_int_cst_sgn (size
) < 0)
4324 error ("size of array %qs is negative", name
);
4325 size
= integer_one_node
;
4328 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4329 && current_scope
== file_scope
)
4331 error ("variably modified %qs at file scope", name
);
4332 size
= integer_one_node
;
4336 /* Make sure the array size remains visibly
4337 nonconstant even if it is (eg) a const variable
4338 with known value. */
4340 warn_variable_length_array (orig_name
, size
);
4343 if (integer_zerop (size
))
4345 /* A zero-length array cannot be represented with
4346 an unsigned index type, which is what we'll
4347 get with build_index_type. Create an
4348 open-ended range instead. */
4349 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4353 /* Arrange for the SAVE_EXPR on the inside of the
4354 MINUS_EXPR, which allows the -1 to get folded
4355 with the +1 that happens when building TYPE_SIZE. */
4357 size
= variable_size (size
);
4359 /* Compute the maximum valid index, that is, size
4360 - 1. Do the calculation in index_type, so that
4361 if it is a variable the computations will be
4362 done in the proper mode. */
4363 itype
= fold_build2 (MINUS_EXPR
, index_type
,
4364 convert (index_type
, size
),
4365 convert (index_type
,
4368 /* If that overflowed, the array is too big. ???
4369 While a size of INT_MAX+1 technically shouldn't
4370 cause an overflow (because we subtract 1), the
4371 overflow is recorded during the conversion to
4372 index_type, before the subtraction. Handling
4373 this case seems like an unnecessary
4375 if (TREE_CODE (itype
) == INTEGER_CST
4376 && TREE_OVERFLOW (itype
))
4378 error ("size of array %qs is too large", name
);
4379 type
= error_mark_node
;
4383 itype
= build_index_type (itype
);
4386 else if (decl_context
== FIELD
)
4388 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4389 pedwarn (input_location
, OPT_pedantic
,
4390 "ISO C90 does not support flexible array members");
4392 /* ISO C99 Flexible array members are effectively
4393 identical to GCC's zero-length array extension. */
4394 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4396 else if (decl_context
== PARM
)
4398 if (array_parm_vla_unspec_p
)
4403 error ("%<[*]%> not allowed in other than a declaration");
4406 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4410 else if (decl_context
== TYPENAME
)
4412 if (array_parm_vla_unspec_p
)
4414 /* The error is printed elsewhere. We use this to
4415 avoid messing up with incomplete array types of
4416 the same type, that would otherwise be modified
4418 itype
= build_range_type (sizetype
, size_zero_node
,
4423 /* Complain about arrays of incomplete types. */
4424 if (!COMPLETE_TYPE_P (type
))
4426 error ("array type has incomplete element type");
4427 type
= error_mark_node
;
4430 /* When itype is NULL, a shared incomplete array type is
4431 returned for all array of a given type. Elsewhere we
4432 make sure we don't complete that type before copying
4433 it, but here we want to make sure we don't ever
4434 modify the shared type, so we gcc_assert (itype)
4436 type
= build_array_type (type
, itype
);
4438 if (type
!= error_mark_node
)
4442 /* It is ok to modify type here even if itype is
4443 NULL: if size_varies, we're in a
4444 multi-dimensional array and the inner type has
4445 variable size, so the enclosing shared array type
4447 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
4449 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
4450 C_TYPE_VARIABLE_SIZE (type
) = 1;
4453 /* The GCC extension for zero-length arrays differs from
4454 ISO flexible array members in that sizeof yields
4456 if (size
&& integer_zerop (size
))
4459 TYPE_SIZE (type
) = bitsize_zero_node
;
4460 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4462 if (array_parm_vla_unspec_p
)
4465 /* The type is complete. C99 6.7.5.2p4 */
4466 TYPE_SIZE (type
) = bitsize_zero_node
;
4467 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4471 if (decl_context
!= PARM
4472 && (array_ptr_quals
!= TYPE_UNQUALIFIED
4473 || array_ptr_attrs
!= NULL_TREE
4474 || array_parm_static
))
4476 error ("static or type qualifiers in non-parameter array declarator");
4477 array_ptr_quals
= TYPE_UNQUALIFIED
;
4478 array_ptr_attrs
= NULL_TREE
;
4479 array_parm_static
= 0;
4485 /* Say it's a definition only for the declarator closest
4486 to the identifier, apart possibly from some
4488 bool really_funcdef
= false;
4492 const struct c_declarator
*t
= declarator
->declarator
;
4493 while (t
->kind
== cdk_attrs
)
4495 really_funcdef
= (t
->kind
== cdk_id
);
4498 /* Declaring a function type. Make sure we have a valid
4499 type for the function to return. */
4500 if (type
== error_mark_node
)
4505 /* Warn about some types functions can't return. */
4506 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4508 error ("%qs declared as function returning a function", name
);
4509 type
= integer_type_node
;
4511 if (TREE_CODE (type
) == ARRAY_TYPE
)
4513 error ("%qs declared as function returning an array", name
);
4514 type
= integer_type_node
;
4517 /* Construct the function type and go to the next
4518 inner layer of declarator. */
4519 arg_info
= declarator
->u
.arg_info
;
4520 arg_types
= grokparms (arg_info
, really_funcdef
);
4522 put_pending_sizes (arg_info
->pending_sizes
);
4524 /* Type qualifiers before the return type of the function
4525 qualify the return type, not the function type. */
4528 /* Type qualifiers on a function return type are
4529 normally permitted by the standard but have no
4530 effect, so give a warning at -Wreturn-type.
4531 Qualifiers on a void return type are banned on
4532 function definitions in ISO C; GCC used to used
4533 them for noreturn functions. */
4534 if (VOID_TYPE_P (type
) && really_funcdef
)
4535 pedwarn (input_location
, 0,
4536 "function definition has qualified void return type");
4538 warning (OPT_Wignored_qualifiers
,
4539 "type qualifiers ignored on function return type");
4541 type
= c_build_qualified_type (type
, type_quals
);
4543 type_quals
= TYPE_UNQUALIFIED
;
4545 type
= build_function_type (type
, arg_types
);
4546 declarator
= declarator
->declarator
;
4548 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4549 the formal parameter list of this FUNCTION_TYPE to point to
4550 the FUNCTION_TYPE node itself. */
4554 for (link
= arg_info
->tags
;
4556 link
= TREE_CHAIN (link
))
4557 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4563 /* Merge any constancy or volatility into the target type
4566 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4568 pedwarn (input_location
, OPT_pedantic
,
4569 "ISO C forbids qualified function types");
4571 type
= c_build_qualified_type (type
, type_quals
);
4574 /* When the pointed-to type involves components of variable size,
4575 care must be taken to ensure that the size evaluation code is
4576 emitted early enough to dominate all the possible later uses
4577 and late enough for the variables on which it depends to have
4580 This is expected to happen automatically when the pointed-to
4581 type has a name/declaration of it's own, but special attention
4582 is required if the type is anonymous.
4584 We handle the NORMAL and FIELD contexts here by attaching an
4585 artificial TYPE_DECL to such pointed-to type. This forces the
4586 sizes evaluation at a safe point and ensures it is not deferred
4587 until e.g. within a deeper conditional context.
4589 We expect nothing to be needed here for PARM or TYPENAME.
4590 Pushing a TYPE_DECL at this point for TYPENAME would actually
4591 be incorrect, as we might be in the middle of an expression
4592 with side effects on the pointed-to type size "arguments" prior
4593 to the pointer declaration point and the fake TYPE_DECL in the
4594 enclosing context would force the size evaluation prior to the
4597 if (!TYPE_NAME (type
)
4598 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
4599 && variably_modified_type_p (type
, NULL_TREE
))
4601 tree decl
= build_decl (TYPE_DECL
, NULL_TREE
, type
);
4602 DECL_ARTIFICIAL (decl
) = 1;
4604 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
4605 TYPE_NAME (type
) = decl
;
4608 type
= build_pointer_type (type
);
4610 /* Process type qualifiers (such as const or volatile)
4611 that were given inside the `*'. */
4612 type_quals
= declarator
->u
.pointer_quals
;
4614 declarator
= declarator
->declarator
;
4621 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
4623 /* Now TYPE has the actual type, apart from any qualifiers in
4626 /* Check the type and width of a bit-field. */
4628 check_bitfield_type_and_width (&type
, width
, orig_name
);
4630 /* Did array size calculations overflow? */
4632 if (TREE_CODE (type
) == ARRAY_TYPE
4633 && COMPLETE_TYPE_P (type
)
4634 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
4635 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
4637 error ("size of array %qs is too large", name
);
4638 /* If we proceed with the array type as it is, we'll eventually
4639 crash in tree_low_cst(). */
4640 type
= error_mark_node
;
4643 /* If this is declaring a typedef name, return a TYPE_DECL. */
4645 if (storage_class
== csc_typedef
)
4648 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4650 pedwarn (input_location
, OPT_pedantic
,
4651 "ISO C forbids qualified function types");
4653 type
= c_build_qualified_type (type
, type_quals
);
4654 decl
= build_decl (TYPE_DECL
, declarator
->u
.id
, type
);
4655 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4656 if (declspecs
->explicit_signed_p
)
4657 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4658 if (declspecs
->inline_p
)
4659 pedwarn (input_location
, 0,"typedef %q+D declared %<inline%>", decl
);
4663 /* If this is a type name (such as, in a cast or sizeof),
4664 compute the type and return it now. */
4666 if (decl_context
== TYPENAME
)
4668 /* Note that the grammar rejects storage classes in typenames
4670 gcc_assert (storage_class
== csc_none
&& !threadp
4671 && !declspecs
->inline_p
);
4672 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4674 pedwarn (input_location
, OPT_pedantic
,
4675 "ISO C forbids const or volatile function types");
4677 type
= c_build_qualified_type (type
, type_quals
);
4681 if (pedantic
&& decl_context
== FIELD
4682 && variably_modified_type_p (type
, NULL_TREE
))
4685 pedwarn (input_location
, OPT_pedantic
,
4686 "a member of a structure or union cannot have a variably modified type");
4689 /* Aside from typedefs and type names (handle above),
4690 `void' at top level (not within pointer)
4691 is allowed only in public variables.
4692 We don't complain about parms either, but that is because
4693 a better error message can be made later. */
4695 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4696 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4697 && (storage_class
== csc_extern
4698 || (current_scope
== file_scope
4699 && !(storage_class
== csc_static
4700 || storage_class
== csc_register
)))))
4702 error ("variable or field %qs declared void", name
);
4703 type
= integer_type_node
;
4706 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4707 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4712 if (decl_context
== PARM
)
4716 /* A parameter declared as an array of T is really a pointer to T.
4717 One declared as a function is really a pointer to a function. */
4719 if (TREE_CODE (type
) == ARRAY_TYPE
)
4721 /* Transfer const-ness of array into that of type pointed to. */
4722 type
= TREE_TYPE (type
);
4724 type
= c_build_qualified_type (type
, type_quals
);
4725 type
= build_pointer_type (type
);
4726 type_quals
= array_ptr_quals
;
4728 type
= c_build_qualified_type (type
, type_quals
);
4730 /* We don't yet implement attributes in this context. */
4731 if (array_ptr_attrs
!= NULL_TREE
)
4732 warning (OPT_Wattributes
,
4733 "attributes in parameter array declarator ignored");
4737 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4740 pedwarn (input_location
, OPT_pedantic
,
4741 "ISO C forbids qualified function types");
4743 type
= c_build_qualified_type (type
, type_quals
);
4744 type
= build_pointer_type (type
);
4745 type_quals
= TYPE_UNQUALIFIED
;
4747 else if (type_quals
)
4748 type
= c_build_qualified_type (type
, type_quals
);
4750 decl
= build_decl (PARM_DECL
, declarator
->u
.id
, type
);
4751 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4753 C_DECL_VARIABLE_SIZE (decl
) = 1;
4755 /* Compute the type actually passed in the parmlist,
4756 for the case where there is no prototype.
4757 (For example, shorts and chars are passed as ints.)
4758 When there is a prototype, this is overridden later. */
4760 if (type
== error_mark_node
)
4761 promoted_type
= type
;
4763 promoted_type
= c_type_promotes_to (type
);
4765 DECL_ARG_TYPE (decl
) = promoted_type
;
4766 if (declspecs
->inline_p
)
4767 pedwarn (input_location
, 0, "parameter %q+D declared %<inline%>", decl
);
4769 else if (decl_context
== FIELD
)
4771 /* Note that the grammar rejects storage classes in typenames
4773 gcc_assert (storage_class
== csc_none
&& !threadp
4774 && !declspecs
->inline_p
);
4776 /* Structure field. It may not be a function. */
4778 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4780 error ("field %qs declared as a function", name
);
4781 type
= build_pointer_type (type
);
4783 else if (TREE_CODE (type
) != ERROR_MARK
4784 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4786 error ("field %qs has incomplete type", name
);
4787 type
= error_mark_node
;
4789 type
= c_build_qualified_type (type
, type_quals
);
4790 decl
= build_decl (FIELD_DECL
, declarator
->u
.id
, type
);
4791 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4792 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4793 if (bitfield
&& !declarator
->u
.id
)
4794 TREE_NO_WARNING (decl
) = 1;
4797 C_DECL_VARIABLE_SIZE (decl
) = 1;
4799 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4801 if (storage_class
== csc_register
|| threadp
)
4803 error ("invalid storage class for function %qs", name
);
4805 else if (current_scope
!= file_scope
)
4807 /* Function declaration not at file scope. Storage
4808 classes other than `extern' are not allowed, C99
4809 6.7.1p5, and `extern' makes no difference. However,
4810 GCC allows 'auto', perhaps with 'inline', to support
4811 nested functions. */
4812 if (storage_class
== csc_auto
)
4813 pedwarn (input_location
, OPT_pedantic
, "invalid storage class for function %qs", name
);
4814 else if (storage_class
== csc_static
)
4816 error ("invalid storage class for function %qs", name
);
4818 storage_class
= declspecs
->storage_class
= csc_none
;
4824 decl
= build_decl (FUNCTION_DECL
, declarator
->u
.id
, type
);
4825 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4826 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4828 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
4829 pedwarn (input_location
, OPT_pedantic
,
4830 "ISO C forbids qualified function types");
4832 /* GNU C interprets a volatile-qualified function type to indicate
4833 that the function does not return. */
4834 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4835 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4836 warning (0, "%<noreturn%> function returns non-void value");
4838 /* Every function declaration is an external reference
4839 (DECL_EXTERNAL) except for those which are not at file
4840 scope and are explicitly declared "auto". This is
4841 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4842 GCC to signify a forward declaration of a nested function. */
4843 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
4844 DECL_EXTERNAL (decl
) = 0;
4845 /* In C99, a function which is declared 'inline' with 'extern'
4846 is not an external reference (which is confusing). It
4847 means that the later definition of the function must be output
4848 in this file, C99 6.7.4p6. In GNU C89, a function declared
4849 'extern inline' is an external reference. */
4850 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
4851 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
4852 == flag_gnu89_inline
);
4854 DECL_EXTERNAL (decl
) = !initialized
;
4856 /* Record absence of global scope for `static' or `auto'. */
4858 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
4860 /* For a function definition, record the argument information
4861 block where store_parm_decls will look for it. */
4863 current_function_arg_info
= arg_info
;
4865 if (declspecs
->default_int_p
)
4866 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4868 /* Record presence of `inline', if it is reasonable. */
4869 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
4871 if (declspecs
->inline_p
)
4872 pedwarn (input_location
, 0, "cannot inline function %<main%>");
4874 else if (declspecs
->inline_p
)
4875 /* Record that the function is declared `inline'. */
4876 DECL_DECLARED_INLINE_P (decl
) = 1;
4880 /* It's a variable. */
4881 /* An uninitialized decl with `extern' is a reference. */
4882 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
4884 type
= c_build_qualified_type (type
, type_quals
);
4886 /* C99 6.2.2p7: It is invalid (compile-time undefined
4887 behavior) to create an 'extern' declaration for a
4888 variable if there is a global declaration that is
4889 'static' and the global declaration is not visible.
4890 (If the static declaration _is_ currently visible,
4891 the 'extern' declaration is taken to refer to that decl.) */
4892 if (extern_ref
&& current_scope
!= file_scope
)
4894 tree global_decl
= identifier_global_value (declarator
->u
.id
);
4895 tree visible_decl
= lookup_name (declarator
->u
.id
);
4898 && global_decl
!= visible_decl
4899 && TREE_CODE (global_decl
) == VAR_DECL
4900 && !TREE_PUBLIC (global_decl
))
4901 error ("variable previously declared %<static%> redeclared "
4905 decl
= build_decl (VAR_DECL
, declarator
->u
.id
, type
);
4906 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4908 C_DECL_VARIABLE_SIZE (decl
) = 1;
4910 if (declspecs
->inline_p
)
4911 pedwarn (input_location
, 0, "variable %q+D declared %<inline%>", decl
);
4913 /* At file scope, an initialized extern declaration may follow
4914 a static declaration. In that case, DECL_EXTERNAL will be
4915 reset later in start_decl. */
4916 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
4918 /* At file scope, the presence of a `static' or `register' storage
4919 class specifier, or the absence of all storage class specifiers
4920 makes this declaration a definition (perhaps tentative). Also,
4921 the absence of `static' makes it public. */
4922 if (current_scope
== file_scope
)
4924 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
4925 TREE_STATIC (decl
) = !extern_ref
;
4927 /* Not at file scope, only `static' makes a static definition. */
4930 TREE_STATIC (decl
) = (storage_class
== csc_static
);
4931 TREE_PUBLIC (decl
) = extern_ref
;
4935 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
4938 if (storage_class
== csc_extern
4939 && variably_modified_type_p (type
, NULL_TREE
))
4942 error ("object with variably modified type must have no linkage");
4945 /* Record `register' declaration for warnings on &
4946 and in case doing stupid register allocation. */
4948 if (storage_class
== csc_register
)
4950 C_DECL_REGISTER (decl
) = 1;
4951 DECL_REGISTER (decl
) = 1;
4954 /* Record constancy and volatility. */
4955 c_apply_type_quals_to_decl (type_quals
, decl
);
4957 /* If a type has volatile components, it should be stored in memory.
4958 Otherwise, the fact that those components are volatile
4959 will be ignored, and would even crash the compiler.
4960 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4961 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
4962 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
4963 || TREE_CODE (decl
) == RESULT_DECL
))
4965 /* It is not an error for a structure with volatile fields to
4966 be declared register, but reset DECL_REGISTER since it
4967 cannot actually go in a register. */
4968 int was_reg
= C_DECL_REGISTER (decl
);
4969 C_DECL_REGISTER (decl
) = 0;
4970 DECL_REGISTER (decl
) = 0;
4971 c_mark_addressable (decl
);
4972 C_DECL_REGISTER (decl
) = was_reg
;
4975 /* This is the earliest point at which we might know the assembler
4976 name of a variable. Thus, if it's known before this, die horribly. */
4977 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
4983 /* Decode the parameter-list info for a function type or function definition.
4984 The argument is the value returned by `get_parm_info' (or made in c-parse.c
4985 if there is an identifier list instead of a parameter decl list).
4986 These two functions are separate because when a function returns
4987 or receives functions then each is called multiple times but the order
4988 of calls is different. The last call to `grokparms' is always the one
4989 that contains the formal parameter names of a function definition.
4991 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4993 FUNCDEF_FLAG is true for a function definition, false for
4994 a mere declaration. A nonempty identifier-list gets an error message
4995 when FUNCDEF_FLAG is false. */
4998 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
5000 tree arg_types
= arg_info
->types
;
5002 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
5004 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5006 error ("%<[*]%> not allowed in other than function prototype scope");
5009 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
5010 warning (OPT_Wstrict_prototypes
,
5011 "function declaration isn%'t a prototype");
5013 if (arg_types
== error_mark_node
)
5014 return 0; /* don't set TYPE_ARG_TYPES in this case */
5016 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
5019 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
5021 arg_info
->parms
= arg_info
->types
;
5022 arg_info
->types
= 0;
5027 tree parm
, type
, typelt
;
5028 unsigned int parmno
;
5030 /* If there is a parameter of incomplete type in a definition,
5031 this is an error. In a declaration this is valid, and a
5032 struct or union type may be completed later, before any calls
5033 or definition of the function. In the case where the tag was
5034 first declared within the parameter list, a warning has
5035 already been given. If a parameter has void type, then
5036 however the function cannot be defined or called, so
5039 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
5041 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
5043 type
= TREE_VALUE (typelt
);
5044 if (type
== error_mark_node
)
5047 if (!COMPLETE_TYPE_P (type
))
5051 if (DECL_NAME (parm
))
5052 error ("parameter %u (%q+D) has incomplete type",
5055 error ("%Jparameter %u has incomplete type",
5058 TREE_VALUE (typelt
) = error_mark_node
;
5059 TREE_TYPE (parm
) = error_mark_node
;
5061 else if (VOID_TYPE_P (type
))
5063 if (DECL_NAME (parm
))
5064 warning (0, "parameter %u (%q+D) has void type",
5067 warning (0, "%Jparameter %u has void type",
5072 if (DECL_NAME (parm
) && TREE_USED (parm
))
5073 warn_if_shadowing (parm
);
5079 /* Take apart the current scope and return a c_arg_info structure with
5080 info on a parameter list just parsed.
5082 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5084 ELLIPSIS being true means the argument list ended in '...' so don't
5085 append a sentinel (void_list_node) to the end of the type-list. */
5088 get_parm_info (bool ellipsis
)
5090 struct c_binding
*b
= current_scope
->bindings
;
5091 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
5098 static bool explained_incomplete_types
= false;
5099 bool gave_void_only_once_err
= false;
5101 arg_info
->parms
= 0;
5103 arg_info
->types
= 0;
5104 arg_info
->others
= 0;
5105 arg_info
->pending_sizes
= 0;
5106 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
5108 /* The bindings in this scope must not get put into a block.
5109 We will take care of deleting the binding nodes. */
5110 current_scope
->bindings
= 0;
5112 /* This function is only called if there was *something* on the
5116 /* A parameter list consisting solely of 'void' indicates that the
5117 function takes no arguments. But if the 'void' is qualified
5118 (by 'const' or 'volatile'), or has a storage class specifier
5119 ('register'), then the behavior is undefined; issue an error.
5120 Typedefs for 'void' are OK (see DR#157). */
5121 if (b
->prev
== 0 /* one binding */
5122 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
5123 && !DECL_NAME (b
->decl
) /* anonymous */
5124 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
5126 if (TREE_THIS_VOLATILE (b
->decl
)
5127 || TREE_READONLY (b
->decl
)
5128 || C_DECL_REGISTER (b
->decl
))
5129 error ("%<void%> as only parameter may not be qualified");
5131 /* There cannot be an ellipsis. */
5133 error ("%<void%> must be the only parameter");
5135 arg_info
->types
= void_list_node
;
5140 types
= void_list_node
;
5142 /* Break up the bindings list into parms, tags, types, and others;
5143 apply sanity checks; purge the name-to-decl bindings. */
5146 tree decl
= b
->decl
;
5147 tree type
= TREE_TYPE (decl
);
5148 const char *keyword
;
5150 switch (TREE_CODE (decl
))
5155 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5156 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5159 /* Check for forward decls that never got their actual decl. */
5160 if (TREE_ASM_WRITTEN (decl
))
5161 error ("parameter %q+D has just a forward declaration", decl
);
5162 /* Check for (..., void, ...) and issue an error. */
5163 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
5165 if (!gave_void_only_once_err
)
5167 error ("%<void%> must be the only parameter");
5168 gave_void_only_once_err
= true;
5173 /* Valid parameter, add it to the list. */
5174 TREE_CHAIN (decl
) = parms
;
5177 /* Since there is a prototype, args are passed in their
5178 declared types. The back end may override this later. */
5179 DECL_ARG_TYPE (decl
) = type
;
5180 types
= tree_cons (0, type
, types
);
5184 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
5185 case UNION_TYPE
: keyword
= "union"; goto tag
;
5186 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
5188 /* Types may not have tag-names, in which case the type
5189 appears in the bindings list with b->id NULL. */
5192 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
5193 I_TAG_BINDING (b
->id
) = b
->shadowed
;
5196 /* Warn about any struct, union or enum tags defined in a
5197 parameter list. The scope of such types is limited to
5198 the parameter list, which is rarely if ever desirable
5199 (it's impossible to call such a function with type-
5200 correct arguments). An anonymous union parm type is
5201 meaningful as a GNU extension, so don't warn for that. */
5202 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
5205 /* The %s will be one of 'struct', 'union', or 'enum'. */
5206 warning (0, "%<%s %E%> declared inside parameter list",
5209 /* The %s will be one of 'struct', 'union', or 'enum'. */
5210 warning (0, "anonymous %s declared inside parameter list",
5213 if (!explained_incomplete_types
)
5215 warning (0, "its scope is only this definition or declaration,"
5216 " which is probably not what you want");
5217 explained_incomplete_types
= true;
5221 tags
= tree_cons (b
->id
, decl
, tags
);
5227 /* CONST_DECLs appear here when we have an embedded enum,
5228 and TYPE_DECLs appear here when we have an embedded struct
5229 or union. No warnings for this - we already warned about the
5230 type itself. FUNCTION_DECLs appear when there is an implicit
5231 function declaration in the parameter list. */
5233 TREE_CHAIN (decl
) = others
;
5238 /* error_mark_node appears here when we have an undeclared
5239 variable. Just throw it away. */
5242 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5243 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5247 /* Other things that might be encountered. */
5254 b
= free_binding_and_advance (b
);
5257 arg_info
->parms
= parms
;
5258 arg_info
->tags
= tags
;
5259 arg_info
->types
= types
;
5260 arg_info
->others
= others
;
5261 arg_info
->pending_sizes
= get_pending_sizes ();
5265 /* Get the struct, enum or union (CODE says which) with tag NAME.
5266 Define the tag as a forward-reference if it is not defined.
5267 Return a c_typespec structure for the type specifier. */
5270 parser_xref_tag (enum tree_code code
, tree name
)
5272 struct c_typespec ret
;
5273 /* If a cross reference is requested, look up the type
5274 already defined for this tag and return it. */
5276 tree ref
= lookup_tag (code
, name
, 0);
5277 /* If this is the right type of tag, return what we found.
5278 (This reference will be shadowed by shadow_tag later if appropriate.)
5279 If this is the wrong type of tag, do not return it. If it was the
5280 wrong type in the same scope, we will have had an error
5281 message already; if in a different scope and declaring
5282 a name, pending_xref_error will give an error message; but if in a
5283 different scope and not declaring a name, this tag should
5284 shadow the previous declaration of a different type of tag, and
5285 this would not work properly if we return the reference found.
5286 (For example, with "struct foo" in an outer scope, "union foo;"
5287 must shadow that tag with a new one of union type.) */
5288 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
5289 if (ref
&& TREE_CODE (ref
) == code
)
5295 /* If no such tag is yet defined, create a forward-reference node
5296 and record it as the "definition".
5297 When a real declaration of this type is found,
5298 the forward-reference will be altered into a real type. */
5300 ref
= make_node (code
);
5301 if (code
== ENUMERAL_TYPE
)
5303 /* Give the type a default layout like unsigned int
5304 to avoid crashing if it does not get defined. */
5305 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
5306 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5307 TYPE_USER_ALIGN (ref
) = 0;
5308 TYPE_UNSIGNED (ref
) = 1;
5309 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5310 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5311 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5314 pushtag (name
, ref
);
5320 /* Get the struct, enum or union (CODE says which) with tag NAME.
5321 Define the tag as a forward-reference if it is not defined.
5322 Return a tree for the type. */
5325 xref_tag (enum tree_code code
, tree name
)
5327 return parser_xref_tag (code
, name
).spec
;
5330 /* Make sure that the tag NAME is defined *in the current scope*
5331 at least as a forward reference.
5332 CODE says which kind of tag NAME ought to be. */
5335 start_struct (enum tree_code code
, tree name
)
5337 /* If there is already a tag defined at this scope
5338 (as a forward reference), just return it. */
5343 ref
= lookup_tag (code
, name
, 1);
5344 if (ref
&& TREE_CODE (ref
) == code
)
5346 if (TYPE_SIZE (ref
))
5348 if (code
== UNION_TYPE
)
5349 error ("redefinition of %<union %E%>", name
);
5351 error ("redefinition of %<struct %E%>", name
);
5353 else if (C_TYPE_BEING_DEFINED (ref
))
5355 if (code
== UNION_TYPE
)
5356 error ("nested redefinition of %<union %E%>", name
);
5358 error ("nested redefinition of %<struct %E%>", name
);
5359 /* Don't create structures that contain themselves. */
5364 /* Otherwise create a forward-reference just so the tag is in scope. */
5366 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
5368 ref
= make_node (code
);
5369 pushtag (name
, ref
);
5372 C_TYPE_BEING_DEFINED (ref
) = 1;
5373 TYPE_PACKED (ref
) = flag_pack_struct
;
5377 /* Process the specs, declarator and width (NULL if omitted)
5378 of a structure component, returning a FIELD_DECL node.
5379 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5380 DECL_ATTRS is as for grokdeclarator.
5382 LOC is the location of the structure component.
5384 This is done during the parsing of the struct declaration.
5385 The FIELD_DECL nodes are chained together and the lot of them
5386 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5389 grokfield (location_t loc
,
5390 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
5391 tree width
, tree
*decl_attrs
)
5395 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
5396 && width
== NULL_TREE
)
5398 /* This is an unnamed decl.
5400 If we have something of the form "union { list } ;" then this
5401 is the anonymous union extension. Similarly for struct.
5403 If this is something of the form "struct foo;", then
5404 If MS extensions are enabled, this is handled as an
5406 Otherwise this is a forward declaration of a structure tag.
5408 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5409 If MS extensions are enabled and foo names a structure, then
5410 again this is an anonymous struct.
5411 Otherwise this is an error.
5413 Oh what a horrid tangled web we weave. I wonder if MS consciously
5414 took this from Plan 9 or if it was an accident of implementation
5415 that took root before someone noticed the bug... */
5417 tree type
= declspecs
->type
;
5418 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
5419 || TREE_CODE (type
) == UNION_TYPE
);
5423 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
5425 if (flag_ms_extensions
)
5429 else if (TYPE_NAME (type
) == NULL
)
5436 pedwarn (loc
, 0, "declaration does not declare anything");
5439 pedwarn (loc
, OPT_pedantic
, "ISO C doesn%'t support unnamed structs/unions");
5442 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5443 width
? &width
: NULL
, decl_attrs
,
5446 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5447 DECL_INITIAL (value
) = width
;
5452 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5453 the list such that this does not present a problem later. */
5456 detect_field_duplicates (tree fieldlist
)
5461 /* First, see if there are more than "a few" fields.
5462 This is trivially true if there are zero or one fields. */
5465 x
= TREE_CHAIN (fieldlist
);
5471 } while (timeout
> 0 && x
);
5473 /* If there were "few" fields, avoid the overhead of allocating
5474 a hash table. Instead just do the nested traversal thing. */
5477 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5480 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5481 if (DECL_NAME (y
) == DECL_NAME (x
))
5483 error ("duplicate member %q+D", x
);
5484 DECL_NAME (x
) = NULL_TREE
;
5490 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5493 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5494 if ((y
= DECL_NAME (x
)) != 0)
5496 slot
= htab_find_slot (htab
, y
, INSERT
);
5499 error ("duplicate member %q+D", x
);
5500 DECL_NAME (x
) = NULL_TREE
;
5509 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5510 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5511 ATTRIBUTES are attributes to be applied to the structure. */
5514 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5517 bool toplevel
= file_scope
== current_scope
;
5518 int saw_named_field
;
5520 /* If this type was previously laid out as a forward reference,
5521 make sure we lay it out again. */
5525 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5529 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5530 if (DECL_NAME (x
) != 0)
5535 if (TREE_CODE (t
) == UNION_TYPE
)
5538 pedwarn (input_location
, OPT_pedantic
, "union has no named members");
5540 pedwarn (input_location
, OPT_pedantic
, "union has no members");
5545 pedwarn (input_location
, OPT_pedantic
, "struct has no named members");
5547 pedwarn (input_location
, OPT_pedantic
, "struct has no members");
5552 /* Install struct as DECL_CONTEXT of each field decl.
5553 Also process specified field sizes, found in the DECL_INITIAL,
5554 storing 0 there after the type has been changed to precision equal
5555 to its width, rather than the precision of the specified standard
5556 type. (Correct layout requires the original type to have been preserved
5559 saw_named_field
= 0;
5560 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5562 if (TREE_TYPE (x
) == error_mark_node
)
5565 DECL_CONTEXT (x
) = t
;
5567 if (TYPE_PACKED (t
) && TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
)
5568 DECL_PACKED (x
) = 1;
5570 /* If any field is const, the structure type is pseudo-const. */
5571 if (TREE_READONLY (x
))
5572 C_TYPE_FIELDS_READONLY (t
) = 1;
5575 /* A field that is pseudo-const makes the structure likewise. */
5576 tree t1
= TREE_TYPE (x
);
5577 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5578 t1
= TREE_TYPE (t1
);
5579 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5580 && C_TYPE_FIELDS_READONLY (t1
))
5581 C_TYPE_FIELDS_READONLY (t
) = 1;
5584 /* Any field that is volatile means variables of this type must be
5585 treated in some ways as volatile. */
5586 if (TREE_THIS_VOLATILE (x
))
5587 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5589 /* Any field of nominal variable size implies structure is too. */
5590 if (C_DECL_VARIABLE_SIZE (x
))
5591 C_TYPE_VARIABLE_SIZE (t
) = 1;
5593 if (DECL_INITIAL (x
))
5595 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5596 DECL_SIZE (x
) = bitsize_int (width
);
5597 DECL_BIT_FIELD (x
) = 1;
5598 SET_DECL_C_BIT_FIELD (x
);
5601 /* Detect flexible array member in an invalid context. */
5602 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5603 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5604 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5605 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5607 if (TREE_CODE (t
) == UNION_TYPE
)
5609 error ("%Jflexible array member in union", x
);
5610 TREE_TYPE (x
) = error_mark_node
;
5612 else if (TREE_CHAIN (x
) != NULL_TREE
)
5614 error ("%Jflexible array member not at end of struct", x
);
5615 TREE_TYPE (x
) = error_mark_node
;
5617 else if (!saw_named_field
)
5619 error ("%Jflexible array member in otherwise empty struct", x
);
5620 TREE_TYPE (x
) = error_mark_node
;
5624 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5625 && flexible_array_type_p (TREE_TYPE (x
)))
5626 pedwarn (input_location
, OPT_pedantic
,
5627 "%Jinvalid use of structure with flexible array member", x
);
5630 saw_named_field
= 1;
5633 detect_field_duplicates (fieldlist
);
5635 /* Now we have the nearly final fieldlist. Record it,
5636 then lay out the structure or union (including the fields). */
5638 TYPE_FIELDS (t
) = fieldlist
;
5642 /* Give bit-fields their proper types. */
5644 tree
*fieldlistp
= &fieldlist
;
5646 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5647 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5649 unsigned HOST_WIDE_INT width
5650 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5651 tree type
= TREE_TYPE (*fieldlistp
);
5652 if (width
!= TYPE_PRECISION (type
))
5654 TREE_TYPE (*fieldlistp
)
5655 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
5656 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
5658 DECL_INITIAL (*fieldlistp
) = 0;
5661 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5664 /* Now we have the truly final field list.
5665 Store it in this type and in the variants. */
5667 TYPE_FIELDS (t
) = fieldlist
;
5669 /* If there are lots of fields, sort so we can look through them fast.
5670 We arbitrarily consider 16 or more elts to be "a lot". */
5675 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5677 if (len
> 15 || DECL_NAME (x
) == NULL
)
5685 struct lang_type
*space
;
5686 struct sorted_fields_type
*space2
;
5688 len
+= list_length (x
);
5690 /* Use the same allocation policy here that make_node uses, to
5691 ensure that this lives as long as the rest of the struct decl.
5692 All decls in an inline function need to be saved. */
5694 space
= GGC_CNEW (struct lang_type
);
5695 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5696 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5700 field_array
= &space2
->elts
[0];
5701 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5703 field_array
[len
++] = x
;
5705 /* If there is anonymous struct or union, break out of the loop. */
5706 if (DECL_NAME (x
) == NULL
)
5709 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5712 TYPE_LANG_SPECIFIC (t
) = space
;
5713 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5714 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5715 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5720 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5722 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5723 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5724 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
5725 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
5726 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
5729 /* If this was supposed to be a transparent union, but we can't
5730 make it one, warn and turn off the flag. */
5731 if (TREE_CODE (t
) == UNION_TYPE
5732 && TYPE_TRANSPARENT_UNION (t
)
5733 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
5735 TYPE_TRANSPARENT_UNION (t
) = 0;
5736 warning (0, "union cannot be made transparent");
5739 /* If this structure or union completes the type of any previous
5740 variable declaration, lay it out and output its rtl. */
5741 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5745 tree decl
= TREE_VALUE (x
);
5746 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5747 layout_array_type (TREE_TYPE (decl
));
5748 if (TREE_CODE (decl
) != TYPE_DECL
)
5750 layout_decl (decl
, 0);
5751 if (c_dialect_objc ())
5752 objc_check_decl (decl
);
5753 rest_of_decl_compilation (decl
, toplevel
, 0);
5758 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5760 /* Finish debugging output for this type. */
5761 rest_of_type_compilation (t
, toplevel
);
5763 /* If we're inside a function proper, i.e. not file-scope and not still
5764 parsing parameters, then arrange for the size of a variable sized type
5766 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
5767 add_stmt (build_stmt (DECL_EXPR
, build_decl (TYPE_DECL
, NULL
, t
)));
5772 /* Lay out the type T, and its element type, and so on. */
5775 layout_array_type (tree t
)
5777 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5778 layout_array_type (TREE_TYPE (t
));
5782 /* Begin compiling the definition of an enumeration type.
5783 NAME is its name (or null if anonymous).
5784 Returns the type object, as yet incomplete.
5785 Also records info about it so that build_enumerator
5786 may be used to declare the individual values as they are read. */
5789 start_enum (struct c_enum_contents
*the_enum
, tree name
)
5793 /* If this is the real definition for a previous forward reference,
5794 fill in the contents in the same object that used to be the
5795 forward reference. */
5798 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5800 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5802 enumtype
= make_node (ENUMERAL_TYPE
);
5803 pushtag (name
, enumtype
);
5806 if (C_TYPE_BEING_DEFINED (enumtype
))
5807 error ("nested redefinition of %<enum %E%>", name
);
5809 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5811 if (TYPE_VALUES (enumtype
) != 0)
5813 /* This enum is a named one that has been declared already. */
5814 error ("redeclaration of %<enum %E%>", name
);
5816 /* Completely replace its old definition.
5817 The old enumerators remain defined, however. */
5818 TYPE_VALUES (enumtype
) = 0;
5821 the_enum
->enum_next_value
= integer_zero_node
;
5822 the_enum
->enum_overflow
= 0;
5824 if (flag_short_enums
)
5825 TYPE_PACKED (enumtype
) = 1;
5830 /* After processing and defining all the values of an enumeration type,
5831 install their decls in the enumeration type and finish it off.
5832 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5833 and ATTRIBUTES are the specified attributes.
5834 Returns ENUMTYPE. */
5837 finish_enum (tree enumtype
, tree values
, tree attributes
)
5840 tree minnode
= 0, maxnode
= 0;
5841 int precision
, unsign
;
5842 bool toplevel
= (file_scope
== current_scope
);
5843 struct lang_type
*lt
;
5845 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5847 /* Calculate the maximum value of any enumerator in this type. */
5849 if (values
== error_mark_node
)
5850 minnode
= maxnode
= integer_zero_node
;
5853 minnode
= maxnode
= TREE_VALUE (values
);
5854 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5856 tree value
= TREE_VALUE (pair
);
5857 if (tree_int_cst_lt (maxnode
, value
))
5859 if (tree_int_cst_lt (value
, minnode
))
5864 /* Construct the final type of this enumeration. It is the same
5865 as one of the integral types - the narrowest one that fits, except
5866 that normally we only go as narrow as int - and signed iff any of
5867 the values are negative. */
5868 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5869 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
5870 tree_int_cst_min_precision (maxnode
, unsign
));
5872 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5874 tem
= c_common_type_for_size (precision
, unsign
);
5877 warning (0, "enumeration values exceed range of largest integer");
5878 tem
= long_long_integer_type_node
;
5882 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5884 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5885 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5886 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5887 TYPE_SIZE (enumtype
) = 0;
5889 /* If the precision of the type was specific with an attribute and it
5890 was too small, give an error. Otherwise, use it. */
5891 if (TYPE_PRECISION (enumtype
))
5893 if (precision
> TYPE_PRECISION (enumtype
))
5894 error ("specified mode too small for enumeral values");
5897 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5899 layout_type (enumtype
);
5901 if (values
!= error_mark_node
)
5903 /* Change the type of the enumerators to be the enum type. We
5904 need to do this irrespective of the size of the enum, for
5905 proper type checking. Replace the DECL_INITIALs of the
5906 enumerators, and the value slots of the list, with copies
5907 that have the enum type; they cannot be modified in place
5908 because they may be shared (e.g. integer_zero_node) Finally,
5909 change the purpose slots to point to the names of the decls. */
5910 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5912 tree enu
= TREE_PURPOSE (pair
);
5913 tree ini
= DECL_INITIAL (enu
);
5915 TREE_TYPE (enu
) = enumtype
;
5917 /* The ISO C Standard mandates enumerators to have type int,
5918 even though the underlying type of an enum type is
5919 unspecified. However, GCC allows enumerators of any
5920 integer type as an extensions. build_enumerator()
5921 converts any enumerators that fit in an int to type int,
5922 to avoid promotions to unsigned types when comparing
5923 integers with enumerators that fit in the int range.
5924 When -pedantic is given, build_enumerator() would have
5925 already warned about those that don't fit. Here we
5926 convert the rest to the enumerator type. */
5927 if (TREE_TYPE (ini
) != integer_type_node
)
5928 ini
= convert (enumtype
, ini
);
5930 DECL_INITIAL (enu
) = ini
;
5931 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5932 TREE_VALUE (pair
) = ini
;
5935 TYPE_VALUES (enumtype
) = values
;
5938 /* Record the min/max values so that we can warn about bit-field
5939 enumerations that are too small for the values. */
5940 lt
= GGC_CNEW (struct lang_type
);
5941 lt
->enum_min
= minnode
;
5942 lt
->enum_max
= maxnode
;
5943 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
5945 /* Fix up all variant types of this enum type. */
5946 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5948 if (tem
== enumtype
)
5950 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5951 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5952 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5953 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5954 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5955 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
5956 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5957 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5958 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5959 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
5960 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
5963 /* Finish debugging output for this type. */
5964 rest_of_type_compilation (enumtype
, toplevel
);
5969 /* Build and install a CONST_DECL for one value of the
5970 current enumeration type (one that was begun with start_enum).
5971 Return a tree-list containing the CONST_DECL and its value.
5972 Assignment of sequential values by default is handled here. */
5975 build_enumerator (struct c_enum_contents
*the_enum
, tree name
, tree value
,
5976 location_t value_loc
)
5980 /* Validate and default VALUE. */
5984 /* Don't issue more errors for error_mark_node (i.e. an
5985 undeclared identifier) - just ignore the value expression. */
5986 if (value
== error_mark_node
)
5988 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
5989 || TREE_CODE (value
) != INTEGER_CST
)
5991 error ("enumerator value for %qE is not an integer constant", name
);
5996 value
= default_conversion (value
);
5997 constant_expression_warning (value
);
6001 /* Default based on previous value. */
6002 /* It should no longer be possible to have NON_LVALUE_EXPR
6006 value
= the_enum
->enum_next_value
;
6007 if (the_enum
->enum_overflow
)
6008 error ("overflow in enumeration values");
6010 /* Even though the underlying type of an enum is unspecified, the
6011 type of enumeration constants is explicitly defined as int
6012 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
6014 else if (!int_fits_type_p (value
, integer_type_node
))
6015 pedwarn (value_loc
, OPT_pedantic
,
6016 "ISO C restricts enumerator values to range of %<int%>");
6018 /* The ISO C Standard mandates enumerators to have type int, even
6019 though the underlying type of an enum type is unspecified.
6020 However, GCC allows enumerators of any integer type as an
6021 extensions. Here we convert any enumerators that fit in an int
6022 to type int, to avoid promotions to unsigned types when comparing
6023 integers with enumerators that fit in the int range. When
6024 -pedantic is given, we would have already warned about those that
6025 don't fit. We have to do this here rather than in finish_enum
6026 because this value may be used to define more enumerators. */
6027 if (int_fits_type_p (value
, integer_type_node
))
6028 value
= convert (integer_type_node
, value
);
6030 /* Set basis for default for next value. */
6031 the_enum
->enum_next_value
6033 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
6034 PLUS_EXPR
, value
, integer_one_node
, 0);
6035 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
6037 /* Now create a declaration for the enum value name. */
6039 type
= TREE_TYPE (value
);
6040 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
6041 TYPE_PRECISION (integer_type_node
)),
6042 (TYPE_PRECISION (type
)
6043 >= TYPE_PRECISION (integer_type_node
)
6044 && TYPE_UNSIGNED (type
)));
6046 decl
= build_decl (CONST_DECL
, name
, type
);
6047 DECL_INITIAL (decl
) = convert (type
, value
);
6050 return tree_cons (decl
, value
, NULL_TREE
);
6054 /* Create the FUNCTION_DECL for a function definition.
6055 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6056 the declaration; they describe the function's name and the type it returns,
6057 but twisted together in a fashion that parallels the syntax of C.
6059 This function creates a binding context for the function body
6060 as well as setting up the FUNCTION_DECL in current_function_decl.
6062 Returns 1 on success. If the DECLARATOR is not suitable for a function
6063 (it defines a datum instead), we return 0, which tells
6064 yyparse to report a parse error. */
6067 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
6070 tree decl1
, old_decl
;
6071 tree restype
, resdecl
;
6072 struct c_label_context_se
*nstack_se
;
6073 struct c_label_context_vm
*nstack_vm
;
6075 current_function_returns_value
= 0; /* Assume, until we see it does. */
6076 current_function_returns_null
= 0;
6077 current_function_returns_abnormally
= 0;
6078 warn_about_return_type
= 0;
6079 c_switch_stack
= NULL
;
6081 nstack_se
= XOBNEW (&parser_obstack
, struct c_label_context_se
);
6082 nstack_se
->labels_def
= NULL
;
6083 nstack_se
->labels_used
= NULL
;
6084 nstack_se
->next
= label_context_stack_se
;
6085 label_context_stack_se
= nstack_se
;
6087 nstack_vm
= XOBNEW (&parser_obstack
, struct c_label_context_vm
);
6088 nstack_vm
->labels_def
= NULL
;
6089 nstack_vm
->labels_used
= NULL
;
6090 nstack_vm
->scope
= 0;
6091 nstack_vm
->next
= label_context_stack_vm
;
6092 label_context_stack_vm
= nstack_vm
;
6094 /* Indicate no valid break/continue context by setting these variables
6095 to some non-null, non-label value. We'll notice and emit the proper
6096 error message in c_finish_bc_stmt. */
6097 c_break_label
= c_cont_label
= size_zero_node
;
6099 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
6100 &attributes
, DEPRECATED_NORMAL
);
6102 /* If the declarator is not suitable for a function definition,
6103 cause a syntax error. */
6106 label_context_stack_se
= label_context_stack_se
->next
;
6107 label_context_stack_vm
= label_context_stack_vm
->next
;
6111 decl_attributes (&decl1
, attributes
, 0);
6113 if (DECL_DECLARED_INLINE_P (decl1
)
6114 && DECL_UNINLINABLE (decl1
)
6115 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
6116 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
6119 /* Handle gnu_inline attribute. */
6120 if (declspecs
->inline_p
6121 && !flag_gnu89_inline
6122 && TREE_CODE (decl1
) == FUNCTION_DECL
6123 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
6124 || current_function_decl
))
6126 if (declspecs
->storage_class
!= csc_static
)
6127 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
6130 announce_function (decl1
);
6132 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
6134 error ("return type is an incomplete type");
6135 /* Make it return void instead. */
6137 = build_function_type (void_type_node
,
6138 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6141 if (warn_about_return_type
)
6142 pedwarn_c99 (input_location
, flag_isoc99
? 0
6143 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
6144 "return type defaults to %<int%>");
6146 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6147 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6148 DECL_INITIAL (decl1
) = error_mark_node
;
6150 /* If this definition isn't a prototype and we had a prototype declaration
6151 before, copy the arg type info from that prototype. */
6152 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
6153 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
6155 current_function_prototype_locus
= UNKNOWN_LOCATION
;
6156 current_function_prototype_built_in
= false;
6157 current_function_prototype_arg_types
= NULL_TREE
;
6158 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6160 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6161 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6162 TREE_TYPE (TREE_TYPE (old_decl
))))
6164 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
6166 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
6167 current_function_prototype_built_in
6168 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
6169 current_function_prototype_arg_types
6170 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
6172 if (TREE_PUBLIC (decl1
))
6174 /* If there is an external prototype declaration of this
6175 function, record its location but do not copy information
6176 to this decl. This may be an invisible declaration
6177 (built-in or in a scope which has finished) or simply
6178 have more refined argument types than any declaration
6180 struct c_binding
*b
;
6181 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
6182 if (B_IN_SCOPE (b
, external_scope
))
6186 tree ext_decl
, ext_type
;
6188 ext_type
= b
->type
? b
->type
: TREE_TYPE (ext_decl
);
6189 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
6190 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6191 TREE_TYPE (ext_type
)))
6193 current_function_prototype_locus
6194 = DECL_SOURCE_LOCATION (ext_decl
);
6195 current_function_prototype_built_in
6196 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
6197 current_function_prototype_arg_types
6198 = TYPE_ARG_TYPES (ext_type
);
6204 /* Optionally warn of old-fashioned def with no previous prototype. */
6205 if (warn_strict_prototypes
6206 && old_decl
!= error_mark_node
6207 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6208 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6209 warning (OPT_Wstrict_prototypes
,
6210 "function declaration isn%'t a prototype");
6211 /* Optionally warn of any global def with no previous prototype. */
6212 else if (warn_missing_prototypes
6213 && old_decl
!= error_mark_node
6214 && TREE_PUBLIC (decl1
)
6215 && !MAIN_NAME_P (DECL_NAME (decl1
))
6216 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6217 warning (OPT_Wmissing_prototypes
, "no previous prototype for %q+D", decl1
);
6218 /* Optionally warn of any def with no previous prototype
6219 if the function has already been used. */
6220 else if (warn_missing_prototypes
6222 && old_decl
!= error_mark_node
6223 && TREE_USED (old_decl
)
6224 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6225 warning (OPT_Wmissing_prototypes
,
6226 "%q+D was used with no prototype before its definition", decl1
);
6227 /* Optionally warn of any global def with no previous declaration. */
6228 else if (warn_missing_declarations
6229 && TREE_PUBLIC (decl1
)
6231 && !MAIN_NAME_P (DECL_NAME (decl1
)))
6232 warning (OPT_Wmissing_declarations
, "no previous declaration for %q+D",
6234 /* Optionally warn of any def with no previous declaration
6235 if the function has already been used. */
6236 else if (warn_missing_declarations
6238 && old_decl
!= error_mark_node
6239 && TREE_USED (old_decl
)
6240 && C_DECL_IMPLICIT (old_decl
))
6241 warning (OPT_Wmissing_declarations
,
6242 "%q+D was used with no declaration before its definition", decl1
);
6244 /* This function exists in static storage.
6245 (This does not mean `static' in the C sense!) */
6246 TREE_STATIC (decl1
) = 1;
6248 /* A nested function is not global. */
6249 if (current_function_decl
!= 0)
6250 TREE_PUBLIC (decl1
) = 0;
6252 /* This is the earliest point at which we might know the assembler
6253 name of the function. Thus, if it's set before this, die horribly. */
6254 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
6256 /* If #pragma weak was used, mark the decl weak now. */
6257 if (current_scope
== file_scope
)
6258 maybe_apply_pragma_weak (decl1
);
6260 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6261 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
6263 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6264 != integer_type_node
)
6265 pedwarn (input_location
, OPT_Wmain
, "return type of %q+D is not %<int%>", decl1
);
6267 check_main_parameter_types (decl1
);
6269 if (!TREE_PUBLIC (decl1
))
6270 pedwarn (input_location
, OPT_Wmain
, "%q+D is normally a non-static function", decl1
);
6273 /* Record the decl so that the function name is defined.
6274 If we already have a decl for this name, and it is a FUNCTION_DECL,
6275 use the old decl. */
6277 current_function_decl
= pushdecl (decl1
);
6280 declare_parm_level ();
6282 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6283 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6284 DECL_ARTIFICIAL (resdecl
) = 1;
6285 DECL_IGNORED_P (resdecl
) = 1;
6286 DECL_RESULT (current_function_decl
) = resdecl
;
6288 start_fname_decls ();
6293 /* Subroutine of store_parm_decls which handles new-style function
6294 definitions (prototype format). The parms already have decls, so we
6295 need only record them as in effect and complain if any redundant
6296 old-style parm decls were written. */
6298 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6302 if (current_scope
->bindings
)
6304 error ("%Jold-style parameter declarations in prototyped "
6305 "function definition", fndecl
);
6307 /* Get rid of the old-style declarations. */
6311 /* Don't issue this warning for nested functions, and don't issue this
6312 warning if we got here because ARG_INFO_TYPES was error_mark_node
6313 (this happens when a function definition has just an ellipsis in
6314 its parameter list). */
6315 else if (!in_system_header
&& !current_function_scope
6316 && arg_info
->types
!= error_mark_node
)
6317 warning (OPT_Wtraditional
,
6318 "%Jtraditional C rejects ISO C style function definitions",
6321 /* Now make all the parameter declarations visible in the function body.
6322 We can bypass most of the grunt work of pushdecl. */
6323 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
6325 DECL_CONTEXT (decl
) = current_function_decl
;
6326 if (DECL_NAME (decl
))
6328 bind (DECL_NAME (decl
), decl
, current_scope
,
6329 /*invisible=*/false, /*nested=*/false);
6330 if (!TREE_USED (decl
))
6331 warn_if_shadowing (decl
);
6334 error ("%Jparameter name omitted", decl
);
6337 /* Record the parameter list in the function declaration. */
6338 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
6340 /* Now make all the ancillary declarations visible, likewise. */
6341 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
6343 DECL_CONTEXT (decl
) = current_function_decl
;
6344 if (DECL_NAME (decl
))
6345 bind (DECL_NAME (decl
), decl
, current_scope
,
6346 /*invisible=*/false, /*nested=*/false);
6349 /* And all the tag declarations. */
6350 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
6351 if (TREE_PURPOSE (decl
))
6352 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
6353 /*invisible=*/false, /*nested=*/false);
6356 /* Subroutine of store_parm_decls which handles old-style function
6357 definitions (separate parameter list and declarations). */
6360 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6362 struct c_binding
*b
;
6363 tree parm
, decl
, last
;
6364 tree parmids
= arg_info
->parms
;
6365 struct pointer_set_t
*seen_args
= pointer_set_create ();
6367 if (!in_system_header
)
6368 warning (OPT_Wold_style_definition
, "%Jold-style function definition",
6371 /* Match each formal parameter name with its declaration. Save each
6372 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6373 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6375 if (TREE_VALUE (parm
) == 0)
6377 error ("%Jparameter name missing from parameter list", fndecl
);
6378 TREE_PURPOSE (parm
) = 0;
6382 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
6383 if (b
&& B_IN_CURRENT_SCOPE (b
))
6386 /* If we got something other than a PARM_DECL it is an error. */
6387 if (TREE_CODE (decl
) != PARM_DECL
)
6388 error ("%q+D declared as a non-parameter", decl
);
6389 /* If the declaration is already marked, we have a duplicate
6390 name. Complain and ignore the duplicate. */
6391 else if (pointer_set_contains (seen_args
, decl
))
6393 error ("multiple parameters named %q+D", decl
);
6394 TREE_PURPOSE (parm
) = 0;
6397 /* If the declaration says "void", complain and turn it into
6399 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
6401 error ("parameter %q+D declared with void type", decl
);
6402 TREE_TYPE (decl
) = integer_type_node
;
6403 DECL_ARG_TYPE (decl
) = integer_type_node
;
6404 layout_decl (decl
, 0);
6406 warn_if_shadowing (decl
);
6408 /* If no declaration found, default to int. */
6411 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
6412 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
6413 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
6415 warn_if_shadowing (decl
);
6418 pedwarn (input_location
, 0, "type of %q+D defaults to %<int%>", decl
);
6420 warning (OPT_Wmissing_parameter_type
, "type of %q+D defaults to %<int%>", decl
);
6423 TREE_PURPOSE (parm
) = decl
;
6424 pointer_set_insert (seen_args
, decl
);
6427 /* Now examine the parms chain for incomplete declarations
6428 and declarations with no corresponding names. */
6430 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6433 if (TREE_CODE (parm
) != PARM_DECL
)
6436 if (TREE_TYPE (parm
) != error_mark_node
6437 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6439 error ("parameter %q+D has incomplete type", parm
);
6440 TREE_TYPE (parm
) = error_mark_node
;
6443 if (!pointer_set_contains (seen_args
, parm
))
6445 error ("declaration for parameter %q+D but no such parameter", parm
);
6447 /* Pretend the parameter was not missing.
6448 This gets us to a standard state and minimizes
6449 further error messages. */
6450 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
6454 /* Chain the declarations together in the order of the list of
6455 names. Store that chain in the function decl, replacing the
6456 list of names. Update the current scope to match. */
6457 DECL_ARGUMENTS (fndecl
) = 0;
6459 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6460 if (TREE_PURPOSE (parm
))
6462 if (parm
&& TREE_PURPOSE (parm
))
6464 last
= TREE_PURPOSE (parm
);
6465 DECL_ARGUMENTS (fndecl
) = last
;
6467 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
6468 if (TREE_PURPOSE (parm
))
6470 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6471 last
= TREE_PURPOSE (parm
);
6473 TREE_CHAIN (last
) = 0;
6476 pointer_set_destroy (seen_args
);
6478 /* If there was a previous prototype,
6479 set the DECL_ARG_TYPE of each argument according to
6480 the type previously specified, and report any mismatches. */
6482 if (current_function_prototype_arg_types
)
6485 for (parm
= DECL_ARGUMENTS (fndecl
),
6486 type
= current_function_prototype_arg_types
;
6487 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
6488 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
6489 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6491 if (parm
== 0 || type
== 0
6492 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6494 if (current_function_prototype_built_in
)
6495 warning (0, "number of arguments doesn%'t match "
6496 "built-in prototype");
6499 error ("number of arguments doesn%'t match prototype");
6500 error ("%Hprototype declaration",
6501 ¤t_function_prototype_locus
);
6505 /* Type for passing arg must be consistent with that
6506 declared for the arg. ISO C says we take the unqualified
6507 type for parameters declared with qualified type. */
6508 if (TREE_TYPE (parm
) != error_mark_node
6509 && TREE_TYPE (type
) != error_mark_node
6510 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6511 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6513 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6514 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6516 /* Adjust argument to match prototype. E.g. a previous
6517 `int foo(float);' prototype causes
6518 `int foo(x) float x; {...}' to be treated like
6519 `int foo(float x) {...}'. This is particularly
6520 useful for argument types like uid_t. */
6521 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6523 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6524 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6525 && TYPE_PRECISION (TREE_TYPE (parm
))
6526 < TYPE_PRECISION (integer_type_node
))
6527 DECL_ARG_TYPE (parm
) = integer_type_node
;
6529 /* ??? Is it possible to get here with a
6530 built-in prototype or will it always have
6531 been diagnosed as conflicting with an
6532 old-style definition and discarded? */
6533 if (current_function_prototype_built_in
)
6534 warning (OPT_pedantic
, "promoted argument %qD "
6535 "doesn%'t match built-in prototype", parm
);
6538 pedwarn (input_location
, OPT_pedantic
, "promoted argument %qD "
6539 "doesn%'t match prototype", parm
);
6540 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
6541 "prototype declaration");
6546 if (current_function_prototype_built_in
)
6547 warning (0, "argument %qD doesn%'t match "
6548 "built-in prototype", parm
);
6551 error ("argument %qD doesn%'t match prototype", parm
);
6552 error ("%Hprototype declaration",
6553 ¤t_function_prototype_locus
);
6558 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6561 /* Otherwise, create a prototype that would match. */
6565 tree actual
= 0, last
= 0, type
;
6567 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6569 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6571 TREE_CHAIN (last
) = type
;
6576 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6578 TREE_CHAIN (last
) = type
;
6582 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6583 of the type of this function, but we need to avoid having this
6584 affect the types of other similarly-typed functions, so we must
6585 first force the generation of an identical (but separate) type
6586 node for the relevant function type. The new node we create
6587 will be a variant of the main variant of the original function
6590 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6592 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6596 /* Store parameter declarations passed in ARG_INFO into the current
6597 function declaration. */
6600 store_parm_decls_from (struct c_arg_info
*arg_info
)
6602 current_function_arg_info
= arg_info
;
6603 store_parm_decls ();
6606 /* Store the parameter declarations into the current function declaration.
6607 This is called after parsing the parameter declarations, before
6608 digesting the body of the function.
6610 For an old-style definition, construct a prototype out of the old-style
6611 parameter declarations and inject it into the function's type. */
6614 store_parm_decls (void)
6616 tree fndecl
= current_function_decl
;
6619 /* The argument information block for FNDECL. */
6620 struct c_arg_info
*arg_info
= current_function_arg_info
;
6621 current_function_arg_info
= 0;
6623 /* True if this definition is written with a prototype. Note:
6624 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6625 list in a function definition as equivalent to (void) -- an
6626 empty argument list specifies the function has no parameters,
6627 but only (void) sets up a prototype for future calls. */
6628 proto
= arg_info
->types
!= 0;
6631 store_parm_decls_newstyle (fndecl
, arg_info
);
6633 store_parm_decls_oldstyle (fndecl
, arg_info
);
6635 /* The next call to push_scope will be a function body. */
6637 next_is_function_body
= true;
6639 /* Write a record describing this function definition to the prototypes
6640 file (if requested). */
6642 gen_aux_info_record (fndecl
, 1, 0, proto
);
6644 /* Initialize the RTL code for the function. */
6645 allocate_struct_function (fndecl
, false);
6647 /* Begin the statement tree for this function. */
6648 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6650 /* ??? Insert the contents of the pending sizes list into the function
6651 to be evaluated. The only reason left to have this is
6652 void foo(int n, int array[n++])
6653 because we throw away the array type in favor of a pointer type, and
6654 thus won't naturally see the SAVE_EXPR containing the increment. All
6655 other pending sizes would be handled by gimplify_parameters. */
6658 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6659 add_stmt (TREE_VALUE (t
));
6662 /* Even though we're inside a function body, we still don't want to
6663 call expand_expr to calculate the size of a variable-sized array.
6664 We haven't necessarily assigned RTL to all variables yet, so it's
6665 not safe to try to expand expressions involving them. */
6666 cfun
->dont_save_pending_sizes_p
= 1;
6669 /* Emit diagnostics that require gimple input for detection. Operate on
6670 FNDECL and all its nested functions. */
6673 c_gimple_diagnostics_recursively (tree fndecl
)
6675 struct cgraph_node
*cgn
;
6676 gimple_seq body
= gimple_body (fndecl
);
6678 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6679 c_warn_unused_result (body
);
6681 /* Notice when OpenMP structured block constraints are violated. */
6683 diagnose_omp_structured_block_errors (fndecl
);
6685 /* Finalize all nested functions now. */
6686 cgn
= cgraph_node (fndecl
);
6687 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6688 c_gimple_diagnostics_recursively (cgn
->decl
);
6691 /* Finish up a function declaration and compile that function
6692 all the way to assembler language output. The free the storage
6693 for the function definition.
6695 This is called after parsing the body of the function definition. */
6698 finish_function (void)
6700 tree fndecl
= current_function_decl
;
6702 label_context_stack_se
= label_context_stack_se
->next
;
6703 label_context_stack_vm
= label_context_stack_vm
->next
;
6705 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6706 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6708 tree args
= DECL_ARGUMENTS (fndecl
);
6709 for (; args
; args
= TREE_CHAIN (args
))
6711 tree type
= TREE_TYPE (args
);
6712 if (INTEGRAL_TYPE_P (type
)
6713 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6714 DECL_ARG_TYPE (args
) = integer_type_node
;
6718 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6719 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6721 /* Must mark the RESULT_DECL as being in this function. */
6723 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6724 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6726 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
6727 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6728 == integer_type_node
&& flag_isoc99
)
6730 tree stmt
= c_finish_return (integer_zero_node
);
6731 /* Hack. We don't want the middle-end to warn that this return
6732 is unreachable, so we mark its location as special. Using
6733 UNKNOWN_LOCATION has the problem that it gets clobbered in
6734 annotate_one_with_locus. A cleaner solution might be to
6735 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6737 SET_EXPR_LOCATION (stmt
, BUILTINS_LOCATION
);
6740 /* Tie off the statement tree for this function. */
6741 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6743 finish_fname_decls ();
6745 /* Complain if there's just no return statement. */
6746 if (warn_return_type
6747 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6748 && !current_function_returns_value
&& !current_function_returns_null
6749 /* Don't complain if we are no-return. */
6750 && !current_function_returns_abnormally
6751 /* Don't warn for main(). */
6752 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6753 /* Or if they didn't actually specify a return type. */
6754 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6755 /* Normally, with -Wreturn-type, flow will complain, but we might
6756 optimize out static functions. */
6757 && !TREE_PUBLIC (fndecl
))
6759 warning (OPT_Wreturn_type
,
6760 "no return statement in function returning non-void");
6761 TREE_NO_WARNING (fndecl
) = 1;
6764 /* Store the end of the function, so that we get good line number
6765 info for the epilogue. */
6766 cfun
->function_end_locus
= input_location
;
6768 /* Finalize the ELF visibility for the function. */
6769 c_determine_visibility (fndecl
);
6771 /* For GNU C extern inline functions disregard inline limits. */
6772 if (DECL_EXTERNAL (fndecl
)
6773 && DECL_DECLARED_INLINE_P (fndecl
))
6774 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
6776 /* Genericize before inlining. Delay genericizing nested functions
6777 until their parent function is genericized. Since finalizing
6778 requires GENERIC, delay that as well. */
6780 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
6781 && !undef_nested_function
)
6783 if (!decl_function_context (fndecl
))
6785 c_genericize (fndecl
);
6786 c_gimple_diagnostics_recursively (fndecl
);
6788 /* ??? Objc emits functions after finalizing the compilation unit.
6789 This should be cleaned up later and this conditional removed. */
6790 if (cgraph_global_info_ready
)
6792 cgraph_add_new_function (fndecl
, false);
6796 cgraph_finalize_function (fndecl
, false);
6800 /* Register this function with cgraph just far enough to get it
6801 added to our parent's nested function list. Handy, since the
6802 C front end doesn't have such a list. */
6803 (void) cgraph_node (fndecl
);
6807 if (!decl_function_context (fndecl
))
6808 undef_nested_function
= false;
6810 /* We're leaving the context of this function, so zap cfun.
6811 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6812 tree_rest_of_compilation. */
6814 current_function_decl
= NULL
;
6817 /* Check the declarations given in a for-loop for satisfying the C99
6818 constraints. If exactly one such decl is found, return it. */
6821 check_for_loop_decls (void)
6823 struct c_binding
*b
;
6824 tree one_decl
= NULL_TREE
;
6829 static bool hint
= true;
6830 /* If we get here, declarations have been used in a for loop without
6831 the C99 for loop scope. This doesn't make much sense, so don't
6833 error ("%<for%> loop initial declarations are only allowed in C99 mode");
6836 inform (input_location
,
6837 "use option -std=c99 or -std=gnu99 to compile your code");
6842 /* C99 subclause 6.8.5 paragraph 3:
6844 [#3] The declaration part of a for statement shall only
6845 declare identifiers for objects having storage class auto or
6848 It isn't clear whether, in this sentence, "identifiers" binds to
6849 "shall only declare" or to "objects" - that is, whether all identifiers
6850 declared must be identifiers for objects, or whether the restriction
6851 only applies to those that are. (A question on this in comp.std.c
6852 in November 2000 received no answer.) We implement the strictest
6853 interpretation, to avoid creating an extension which later causes
6856 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6859 tree decl
= b
->decl
;
6864 switch (TREE_CODE (decl
))
6867 if (TREE_STATIC (decl
))
6868 error ("declaration of static variable %q+D in %<for%> loop "
6869 "initial declaration", decl
);
6870 else if (DECL_EXTERNAL (decl
))
6871 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6872 "initial declaration", decl
);
6876 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6880 error ("%<union %E%> declared in %<for%> loop initial declaration",
6884 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6888 error ("declaration of non-variable %q+D in %<for%> loop "
6889 "initial declaration", decl
);
6896 return n_decls
== 1 ? one_decl
: NULL_TREE
;
6899 /* Save and reinitialize the variables
6900 used during compilation of a C function. */
6903 c_push_function_context (void)
6905 struct language_function
*p
;
6906 p
= GGC_NEW (struct language_function
);
6909 p
->base
.x_stmt_tree
= c_stmt_tree
;
6910 p
->x_break_label
= c_break_label
;
6911 p
->x_cont_label
= c_cont_label
;
6912 p
->x_switch_stack
= c_switch_stack
;
6913 p
->arg_info
= current_function_arg_info
;
6914 p
->returns_value
= current_function_returns_value
;
6915 p
->returns_null
= current_function_returns_null
;
6916 p
->returns_abnormally
= current_function_returns_abnormally
;
6917 p
->warn_about_return_type
= warn_about_return_type
;
6919 push_function_context ();
6922 /* Restore the variables used during compilation of a C function. */
6925 c_pop_function_context (void)
6927 struct language_function
*p
;
6929 pop_function_context ();
6931 cfun
->language
= NULL
;
6933 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
6934 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6936 /* Stop pointing to the local nodes about to be freed. */
6937 /* But DECL_INITIAL must remain nonzero so we know this
6938 was an actual function definition. */
6939 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6940 DECL_ARGUMENTS (current_function_decl
) = 0;
6943 c_stmt_tree
= p
->base
.x_stmt_tree
;
6944 c_break_label
= p
->x_break_label
;
6945 c_cont_label
= p
->x_cont_label
;
6946 c_switch_stack
= p
->x_switch_stack
;
6947 current_function_arg_info
= p
->arg_info
;
6948 current_function_returns_value
= p
->returns_value
;
6949 current_function_returns_null
= p
->returns_null
;
6950 current_function_returns_abnormally
= p
->returns_abnormally
;
6951 warn_about_return_type
= p
->warn_about_return_type
;
6954 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6957 c_dup_lang_specific_decl (tree decl
)
6959 struct lang_decl
*ld
;
6961 if (!DECL_LANG_SPECIFIC (decl
))
6964 ld
= GGC_NEW (struct lang_decl
);
6965 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6966 DECL_LANG_SPECIFIC (decl
) = ld
;
6969 /* The functions below are required for functionality of doing
6970 function at once processing in the C front end. Currently these
6971 functions are not called from anywhere in the C front end, but as
6972 these changes continue, that will change. */
6974 /* Returns the stmt_tree (if any) to which statements are currently
6975 being added. If there is no active statement-tree, NULL is
6979 current_stmt_tree (void)
6981 return &c_stmt_tree
;
6984 /* Return the global value of T as a symbol. */
6987 identifier_global_value (tree t
)
6989 struct c_binding
*b
;
6991 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
6992 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
6998 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6999 otherwise the name is found in ridpointers from RID_INDEX. */
7002 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
7006 id
= ridpointers
[(int) rid_index
];
7008 id
= get_identifier (name
);
7009 decl
= build_decl (TYPE_DECL
, id
, type
);
7011 if (debug_hooks
->type_decl
)
7012 debug_hooks
->type_decl (decl
, false);
7015 /* Build the void_list_node (void_type_node having been created). */
7017 build_void_list_node (void)
7019 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
7023 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7026 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
7027 struct c_declarator
*declarator
)
7029 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
7032 ret
->declarator
= declarator
;
7036 /* Return a declarator with nested attributes. TARGET is the inner
7037 declarator to which these attributes apply. ATTRS are the
7040 struct c_declarator
*
7041 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
7043 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7044 ret
->kind
= cdk_attrs
;
7045 ret
->declarator
= target
;
7046 ret
->u
.attrs
= attrs
;
7050 /* Return a declarator for a function with arguments specified by ARGS
7051 and return type specified by TARGET. */
7053 struct c_declarator
*
7054 build_function_declarator (struct c_arg_info
*args
,
7055 struct c_declarator
*target
)
7057 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7058 ret
->kind
= cdk_function
;
7059 ret
->declarator
= target
;
7060 ret
->u
.arg_info
= args
;
7064 /* Return a declarator for the identifier IDENT (which may be
7065 NULL_TREE for an abstract declarator). */
7067 struct c_declarator
*
7068 build_id_declarator (tree ident
)
7070 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7072 ret
->declarator
= 0;
7074 /* Default value - may get reset to a more precise location. */
7075 ret
->id_loc
= input_location
;
7079 /* Return something to represent absolute declarators containing a *.
7080 TARGET is the absolute declarator that the * contains.
7081 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7082 to apply to the pointer type. */
7084 struct c_declarator
*
7085 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
7086 struct c_declarator
*target
)
7090 struct c_declarator
*itarget
= target
;
7091 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7092 if (type_quals_attrs
)
7094 attrs
= type_quals_attrs
->attrs
;
7095 quals
= quals_from_declspecs (type_quals_attrs
);
7096 if (attrs
!= NULL_TREE
)
7097 itarget
= build_attrs_declarator (attrs
, target
);
7099 ret
->kind
= cdk_pointer
;
7100 ret
->declarator
= itarget
;
7101 ret
->u
.pointer_quals
= quals
;
7105 /* Return a pointer to a structure for an empty list of declaration
7108 struct c_declspecs
*
7109 build_null_declspecs (void)
7111 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
7115 ret
->typespec_word
= cts_none
;
7116 ret
->storage_class
= csc_none
;
7117 ret
->declspecs_seen_p
= false;
7118 ret
->type_seen_p
= false;
7119 ret
->non_sc_seen_p
= false;
7120 ret
->typedef_p
= false;
7121 ret
->tag_defined_p
= false;
7122 ret
->explicit_signed_p
= false;
7123 ret
->deprecated_p
= false;
7124 ret
->default_int_p
= false;
7125 ret
->long_p
= false;
7126 ret
->long_long_p
= false;
7127 ret
->short_p
= false;
7128 ret
->signed_p
= false;
7129 ret
->unsigned_p
= false;
7130 ret
->complex_p
= false;
7131 ret
->inline_p
= false;
7132 ret
->thread_p
= false;
7133 ret
->const_p
= false;
7134 ret
->volatile_p
= false;
7135 ret
->restrict_p
= false;
7136 ret
->saturating_p
= false;
7140 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7143 struct c_declspecs
*
7144 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
7148 specs
->non_sc_seen_p
= true;
7149 specs
->declspecs_seen_p
= true;
7150 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
7151 && C_IS_RESERVED_WORD (qual
));
7152 i
= C_RID_CODE (qual
);
7156 dupe
= specs
->const_p
;
7157 specs
->const_p
= true;
7160 dupe
= specs
->volatile_p
;
7161 specs
->volatile_p
= true;
7164 dupe
= specs
->restrict_p
;
7165 specs
->restrict_p
= true;
7170 if (dupe
&& !flag_isoc99
)
7171 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
7175 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7178 struct c_declspecs
*
7179 declspecs_add_type (struct c_declspecs
*specs
, struct c_typespec spec
)
7181 tree type
= spec
.spec
;
7182 specs
->non_sc_seen_p
= true;
7183 specs
->declspecs_seen_p
= true;
7184 specs
->type_seen_p
= true;
7185 if (TREE_DEPRECATED (type
))
7186 specs
->deprecated_p
= true;
7188 /* Handle type specifier keywords. */
7189 if (TREE_CODE (type
) == IDENTIFIER_NODE
7190 && C_IS_RESERVED_WORD (type
)
7191 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
7193 enum rid i
= C_RID_CODE (type
);
7196 error ("two or more data types in declaration specifiers");
7199 if ((int) i
<= (int) RID_LAST_MODIFIER
)
7201 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7206 if (specs
->long_long_p
)
7208 error ("%<long long long%> is too long for GCC");
7213 if (specs
->typespec_word
== cts_double
)
7215 error ("both %<long long%> and %<double%> in "
7216 "declaration specifiers");
7219 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
7220 pedwarn (input_location
, OPT_Wlong_long
, "ISO C90 does not support %<long long%>");
7221 specs
->long_long_p
= 1;
7225 error ("both %<long%> and %<short%> in "
7226 "declaration specifiers");
7227 else if (specs
->typespec_word
== cts_void
)
7228 error ("both %<long%> and %<void%> in "
7229 "declaration specifiers");
7230 else if (specs
->typespec_word
== cts_bool
)
7231 error ("both %<long%> and %<_Bool%> in "
7232 "declaration specifiers");
7233 else if (specs
->typespec_word
== cts_char
)
7234 error ("both %<long%> and %<char%> in "
7235 "declaration specifiers");
7236 else if (specs
->typespec_word
== cts_float
)
7237 error ("both %<long%> and %<float%> in "
7238 "declaration specifiers");
7239 else if (specs
->typespec_word
== cts_dfloat32
)
7240 error ("both %<long%> and %<_Decimal32%> in "
7241 "declaration specifiers");
7242 else if (specs
->typespec_word
== cts_dfloat64
)
7243 error ("both %<long%> and %<_Decimal64%> in "
7244 "declaration specifiers");
7245 else if (specs
->typespec_word
== cts_dfloat128
)
7246 error ("both %<long%> and %<_Decimal128%> in "
7247 "declaration specifiers");
7249 specs
->long_p
= true;
7252 dupe
= specs
->short_p
;
7254 error ("both %<long%> and %<short%> in "
7255 "declaration specifiers");
7256 else if (specs
->typespec_word
== cts_void
)
7257 error ("both %<short%> and %<void%> in "
7258 "declaration specifiers");
7259 else if (specs
->typespec_word
== cts_bool
)
7260 error ("both %<short%> and %<_Bool%> in "
7261 "declaration specifiers");
7262 else if (specs
->typespec_word
== cts_char
)
7263 error ("both %<short%> and %<char%> in "
7264 "declaration specifiers");
7265 else if (specs
->typespec_word
== cts_float
)
7266 error ("both %<short%> and %<float%> in "
7267 "declaration specifiers");
7268 else if (specs
->typespec_word
== cts_double
)
7269 error ("both %<short%> and %<double%> in "
7270 "declaration specifiers");
7271 else if (specs
->typespec_word
== cts_dfloat32
)
7272 error ("both %<short%> and %<_Decimal32%> in "
7273 "declaration specifiers");
7274 else if (specs
->typespec_word
== cts_dfloat64
)
7275 error ("both %<short%> and %<_Decimal64%> in "
7276 "declaration specifiers");
7277 else if (specs
->typespec_word
== cts_dfloat128
)
7278 error ("both %<short%> and %<_Decimal128%> in "
7279 "declaration specifiers");
7281 specs
->short_p
= true;
7284 dupe
= specs
->signed_p
;
7285 if (specs
->unsigned_p
)
7286 error ("both %<signed%> and %<unsigned%> in "
7287 "declaration specifiers");
7288 else if (specs
->typespec_word
== cts_void
)
7289 error ("both %<signed%> and %<void%> in "
7290 "declaration specifiers");
7291 else if (specs
->typespec_word
== cts_bool
)
7292 error ("both %<signed%> and %<_Bool%> in "
7293 "declaration specifiers");
7294 else if (specs
->typespec_word
== cts_float
)
7295 error ("both %<signed%> and %<float%> in "
7296 "declaration specifiers");
7297 else if (specs
->typespec_word
== cts_double
)
7298 error ("both %<signed%> and %<double%> in "
7299 "declaration specifiers");
7300 else if (specs
->typespec_word
== cts_dfloat32
)
7301 error ("both %<signed%> and %<_Decimal32%> in "
7302 "declaration specifiers");
7303 else if (specs
->typespec_word
== cts_dfloat64
)
7304 error ("both %<signed%> and %<_Decimal64%> in "
7305 "declaration specifiers");
7306 else if (specs
->typespec_word
== cts_dfloat128
)
7307 error ("both %<signed%> and %<_Decimal128%> in "
7308 "declaration specifiers");
7310 specs
->signed_p
= true;
7313 dupe
= specs
->unsigned_p
;
7314 if (specs
->signed_p
)
7315 error ("both %<signed%> and %<unsigned%> in "
7316 "declaration specifiers");
7317 else if (specs
->typespec_word
== cts_void
)
7318 error ("both %<unsigned%> and %<void%> in "
7319 "declaration specifiers");
7320 else if (specs
->typespec_word
== cts_bool
)
7321 error ("both %<unsigned%> and %<_Bool%> in "
7322 "declaration specifiers");
7323 else if (specs
->typespec_word
== cts_float
)
7324 error ("both %<unsigned%> and %<float%> in "
7325 "declaration specifiers");
7326 else if (specs
->typespec_word
== cts_double
)
7327 error ("both %<unsigned%> and %<double%> in "
7328 "declaration specifiers");
7329 else if (specs
->typespec_word
== cts_dfloat32
)
7330 error ("both %<unsigned%> and %<_Decimal32%> in "
7331 "declaration specifiers");
7332 else if (specs
->typespec_word
== cts_dfloat64
)
7333 error ("both %<unsigned%> and %<_Decimal64%> in "
7334 "declaration specifiers");
7335 else if (specs
->typespec_word
== cts_dfloat128
)
7336 error ("both %<unsigned%> and %<_Decimal128%> in "
7337 "declaration specifiers");
7339 specs
->unsigned_p
= true;
7342 dupe
= specs
->complex_p
;
7343 if (!flag_isoc99
&& !in_system_header
)
7344 pedwarn (input_location
, OPT_pedantic
, "ISO C90 does not support complex types");
7345 if (specs
->typespec_word
== cts_void
)
7346 error ("both %<complex%> and %<void%> in "
7347 "declaration specifiers");
7348 else if (specs
->typespec_word
== cts_bool
)
7349 error ("both %<complex%> and %<_Bool%> in "
7350 "declaration specifiers");
7351 else if (specs
->typespec_word
== cts_dfloat32
)
7352 error ("both %<complex%> and %<_Decimal32%> in "
7353 "declaration specifiers");
7354 else if (specs
->typespec_word
== cts_dfloat64
)
7355 error ("both %<complex%> and %<_Decimal64%> in "
7356 "declaration specifiers");
7357 else if (specs
->typespec_word
== cts_dfloat128
)
7358 error ("both %<complex%> and %<_Decimal128%> in "
7359 "declaration specifiers");
7360 else if (specs
->typespec_word
== cts_fract
)
7361 error ("both %<complex%> and %<_Fract%> in "
7362 "declaration specifiers");
7363 else if (specs
->typespec_word
== cts_accum
)
7364 error ("both %<complex%> and %<_Accum%> in "
7365 "declaration specifiers");
7366 else if (specs
->saturating_p
)
7367 error ("both %<complex%> and %<_Sat%> in "
7368 "declaration specifiers");
7370 specs
->complex_p
= true;
7373 dupe
= specs
->saturating_p
;
7374 pedwarn (input_location
, OPT_pedantic
, "ISO C does not support saturating types");
7375 if (specs
->typespec_word
== cts_void
)
7376 error ("both %<_Sat%> and %<void%> in "
7377 "declaration specifiers");
7378 else if (specs
->typespec_word
== cts_bool
)
7379 error ("both %<_Sat%> and %<_Bool%> in "
7380 "declaration specifiers");
7381 else if (specs
->typespec_word
== cts_char
)
7382 error ("both %<_Sat%> and %<char%> in "
7383 "declaration specifiers");
7384 else if (specs
->typespec_word
== cts_int
)
7385 error ("both %<_Sat%> and %<int%> in "
7386 "declaration specifiers");
7387 else if (specs
->typespec_word
== cts_float
)
7388 error ("both %<_Sat%> and %<float%> in "
7389 "declaration specifiers");
7390 else if (specs
->typespec_word
== cts_double
)
7391 error ("both %<_Sat%> and %<double%> in "
7392 "declaration specifiers");
7393 else if (specs
->typespec_word
== cts_dfloat32
)
7394 error ("both %<_Sat%> and %<_Decimal32%> in "
7395 "declaration specifiers");
7396 else if (specs
->typespec_word
== cts_dfloat64
)
7397 error ("both %<_Sat%> and %<_Decimal64%> in "
7398 "declaration specifiers");
7399 else if (specs
->typespec_word
== cts_dfloat128
)
7400 error ("both %<_Sat%> and %<_Decimal128%> in "
7401 "declaration specifiers");
7402 else if (specs
->complex_p
)
7403 error ("both %<_Sat%> and %<complex%> in "
7404 "declaration specifiers");
7406 specs
->saturating_p
= true;
7413 error ("duplicate %qE", type
);
7419 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7420 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7421 if (specs
->typespec_word
!= cts_none
)
7423 error ("two or more data types in declaration specifiers");
7430 error ("both %<long%> and %<void%> in "
7431 "declaration specifiers");
7432 else if (specs
->short_p
)
7433 error ("both %<short%> and %<void%> in "
7434 "declaration specifiers");
7435 else if (specs
->signed_p
)
7436 error ("both %<signed%> and %<void%> in "
7437 "declaration specifiers");
7438 else if (specs
->unsigned_p
)
7439 error ("both %<unsigned%> and %<void%> in "
7440 "declaration specifiers");
7441 else if (specs
->complex_p
)
7442 error ("both %<complex%> and %<void%> in "
7443 "declaration specifiers");
7444 else if (specs
->saturating_p
)
7445 error ("both %<_Sat%> and %<void%> in "
7446 "declaration specifiers");
7448 specs
->typespec_word
= cts_void
;
7452 error ("both %<long%> and %<_Bool%> in "
7453 "declaration specifiers");
7454 else if (specs
->short_p
)
7455 error ("both %<short%> and %<_Bool%> in "
7456 "declaration specifiers");
7457 else if (specs
->signed_p
)
7458 error ("both %<signed%> and %<_Bool%> in "
7459 "declaration specifiers");
7460 else if (specs
->unsigned_p
)
7461 error ("both %<unsigned%> and %<_Bool%> in "
7462 "declaration specifiers");
7463 else if (specs
->complex_p
)
7464 error ("both %<complex%> and %<_Bool%> in "
7465 "declaration specifiers");
7466 else if (specs
->saturating_p
)
7467 error ("both %<_Sat%> and %<_Bool%> in "
7468 "declaration specifiers");
7470 specs
->typespec_word
= cts_bool
;
7474 error ("both %<long%> and %<char%> in "
7475 "declaration specifiers");
7476 else if (specs
->short_p
)
7477 error ("both %<short%> and %<char%> in "
7478 "declaration specifiers");
7479 else if (specs
->saturating_p
)
7480 error ("both %<_Sat%> and %<char%> in "
7481 "declaration specifiers");
7483 specs
->typespec_word
= cts_char
;
7486 if (specs
->saturating_p
)
7487 error ("both %<_Sat%> and %<int%> in "
7488 "declaration specifiers");
7490 specs
->typespec_word
= cts_int
;
7494 error ("both %<long%> and %<float%> in "
7495 "declaration specifiers");
7496 else if (specs
->short_p
)
7497 error ("both %<short%> and %<float%> in "
7498 "declaration specifiers");
7499 else if (specs
->signed_p
)
7500 error ("both %<signed%> and %<float%> in "
7501 "declaration specifiers");
7502 else if (specs
->unsigned_p
)
7503 error ("both %<unsigned%> and %<float%> in "
7504 "declaration specifiers");
7505 else if (specs
->saturating_p
)
7506 error ("both %<_Sat%> and %<float%> in "
7507 "declaration specifiers");
7509 specs
->typespec_word
= cts_float
;
7512 if (specs
->long_long_p
)
7513 error ("both %<long long%> and %<double%> in "
7514 "declaration specifiers");
7515 else if (specs
->short_p
)
7516 error ("both %<short%> and %<double%> in "
7517 "declaration specifiers");
7518 else if (specs
->signed_p
)
7519 error ("both %<signed%> and %<double%> in "
7520 "declaration specifiers");
7521 else if (specs
->unsigned_p
)
7522 error ("both %<unsigned%> and %<double%> in "
7523 "declaration specifiers");
7524 else if (specs
->saturating_p
)
7525 error ("both %<_Sat%> and %<double%> in "
7526 "declaration specifiers");
7528 specs
->typespec_word
= cts_double
;
7535 if (i
== RID_DFLOAT32
)
7537 else if (i
== RID_DFLOAT64
)
7540 str
= "_Decimal128";
7541 if (specs
->long_long_p
)
7542 error ("both %<long long%> and %<%s%> in "
7543 "declaration specifiers", str
);
7545 error ("both %<long%> and %<%s%> in "
7546 "declaration specifiers", str
);
7547 else if (specs
->short_p
)
7548 error ("both %<short%> and %<%s%> in "
7549 "declaration specifiers", str
);
7550 else if (specs
->signed_p
)
7551 error ("both %<signed%> and %<%s%> in "
7552 "declaration specifiers", str
);
7553 else if (specs
->unsigned_p
)
7554 error ("both %<unsigned%> and %<%s%> in "
7555 "declaration specifiers", str
);
7556 else if (specs
->complex_p
)
7557 error ("both %<complex%> and %<%s%> in "
7558 "declaration specifiers", str
);
7559 else if (specs
->saturating_p
)
7560 error ("both %<_Sat%> and %<%s%> in "
7561 "declaration specifiers", str
);
7562 else if (i
== RID_DFLOAT32
)
7563 specs
->typespec_word
= cts_dfloat32
;
7564 else if (i
== RID_DFLOAT64
)
7565 specs
->typespec_word
= cts_dfloat64
;
7567 specs
->typespec_word
= cts_dfloat128
;
7569 if (!targetm
.decimal_float_supported_p ())
7570 error ("decimal floating point not supported for this target");
7571 pedwarn (input_location
, OPT_pedantic
,
7572 "ISO C does not support decimal floating point");
7582 if (specs
->complex_p
)
7583 error ("both %<complex%> and %<%s%> in "
7584 "declaration specifiers", str
);
7585 else if (i
== RID_FRACT
)
7586 specs
->typespec_word
= cts_fract
;
7588 specs
->typespec_word
= cts_accum
;
7590 if (!targetm
.fixed_point_supported_p ())
7591 error ("fixed-point types not supported for this target");
7592 pedwarn (input_location
, OPT_pedantic
,
7593 "ISO C does not support fixed-point types");
7596 /* ObjC reserved word "id", handled below. */
7602 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7603 form of ObjC type, cases such as "int" and "long" being handled
7604 above), a TYPE (struct, union, enum and typeof specifiers) or an
7605 ERROR_MARK. In none of these cases may there have previously
7606 been any type specifiers. */
7607 if (specs
->type
|| specs
->typespec_word
!= cts_none
7608 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
7609 || specs
->unsigned_p
|| specs
->complex_p
)
7610 error ("two or more data types in declaration specifiers");
7611 else if (TREE_CODE (type
) == TYPE_DECL
)
7613 if (TREE_TYPE (type
) == error_mark_node
)
7614 ; /* Allow the type to default to int to avoid cascading errors. */
7617 specs
->type
= TREE_TYPE (type
);
7618 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
7619 specs
->typedef_p
= true;
7620 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
7623 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
7625 tree t
= lookup_name (type
);
7626 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
7627 error ("%qE fails to be a typedef or built in type", type
);
7628 else if (TREE_TYPE (t
) == error_mark_node
)
7631 specs
->type
= TREE_TYPE (t
);
7633 else if (TREE_CODE (type
) != ERROR_MARK
)
7635 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
7636 specs
->tag_defined_p
= true;
7637 if (spec
.kind
== ctsk_typeof
)
7638 specs
->typedef_p
= true;
7645 /* Add the storage class specifier or function specifier SCSPEC to the
7646 declaration specifiers SPECS, returning SPECS. */
7648 struct c_declspecs
*
7649 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
7652 enum c_storage_class n
= csc_none
;
7654 specs
->declspecs_seen_p
= true;
7655 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
7656 && C_IS_RESERVED_WORD (scspec
));
7657 i
= C_RID_CODE (scspec
);
7658 if (specs
->non_sc_seen_p
)
7659 warning (OPT_Wold_style_declaration
,
7660 "%qE is not at beginning of declaration", scspec
);
7664 /* C99 permits duplicate inline. Although of doubtful utility,
7665 it seems simplest to permit it in gnu89 mode as well, as
7666 there is also little utility in maintaining this as a
7667 difference between gnu89 and C99 inline. */
7669 specs
->inline_p
= true;
7672 dupe
= specs
->thread_p
;
7673 if (specs
->storage_class
== csc_auto
)
7674 error ("%<__thread%> used with %<auto%>");
7675 else if (specs
->storage_class
== csc_register
)
7676 error ("%<__thread%> used with %<register%>");
7677 else if (specs
->storage_class
== csc_typedef
)
7678 error ("%<__thread%> used with %<typedef%>");
7680 specs
->thread_p
= true;
7687 /* Diagnose "__thread extern". */
7688 if (specs
->thread_p
)
7689 error ("%<__thread%> before %<extern%>");
7696 /* Diagnose "__thread static". */
7697 if (specs
->thread_p
)
7698 error ("%<__thread%> before %<static%>");
7706 if (n
!= csc_none
&& n
== specs
->storage_class
)
7709 error ("duplicate %qE", scspec
);
7712 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
7714 error ("multiple storage classes in declaration specifiers");
7718 specs
->storage_class
= n
;
7719 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
7721 error ("%<__thread%> used with %qE", scspec
);
7722 specs
->thread_p
= false;
7729 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7732 struct c_declspecs
*
7733 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
7735 specs
->attrs
= chainon (attrs
, specs
->attrs
);
7736 specs
->declspecs_seen_p
= true;
7740 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7741 specifiers with any other type specifier to determine the resulting
7742 type. This is where ISO C checks on complex types are made, since
7743 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7746 struct c_declspecs
*
7747 finish_declspecs (struct c_declspecs
*specs
)
7749 /* If a type was specified as a whole, we have no modifiers and are
7751 if (specs
->type
!= NULL_TREE
)
7753 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7754 && !specs
->signed_p
&& !specs
->unsigned_p
7755 && !specs
->complex_p
);
7759 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7760 has been specified, treat it as "int" unless "_Complex" is
7761 present and there are no other specifiers. If we just have
7762 "_Complex", it is equivalent to "_Complex double", but e.g.
7763 "_Complex short" is equivalent to "_Complex short int". */
7764 if (specs
->typespec_word
== cts_none
)
7766 if (specs
->saturating_p
)
7768 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7769 specs
->typespec_word
= cts_fract
;
7771 else if (specs
->long_p
|| specs
->short_p
7772 || specs
->signed_p
|| specs
->unsigned_p
)
7774 specs
->typespec_word
= cts_int
;
7776 else if (specs
->complex_p
)
7778 specs
->typespec_word
= cts_double
;
7779 pedwarn (input_location
, OPT_pedantic
,
7780 "ISO C does not support plain %<complex%> meaning "
7781 "%<double complex%>");
7785 specs
->typespec_word
= cts_int
;
7786 specs
->default_int_p
= true;
7787 /* We don't diagnose this here because grokdeclarator will
7788 give more specific diagnostics according to whether it is
7789 a function definition. */
7793 /* If "signed" was specified, record this to distinguish "int" and
7794 "signed int" in the case of a bit-field with
7795 -funsigned-bitfields. */
7796 specs
->explicit_signed_p
= specs
->signed_p
;
7798 /* Now compute the actual type. */
7799 switch (specs
->typespec_word
)
7802 gcc_assert (!specs
->long_p
&& !specs
->short_p
7803 && !specs
->signed_p
&& !specs
->unsigned_p
7804 && !specs
->complex_p
);
7805 specs
->type
= void_type_node
;
7808 gcc_assert (!specs
->long_p
&& !specs
->short_p
7809 && !specs
->signed_p
&& !specs
->unsigned_p
7810 && !specs
->complex_p
);
7811 specs
->type
= boolean_type_node
;
7814 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
7815 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7816 if (specs
->signed_p
)
7817 specs
->type
= signed_char_type_node
;
7818 else if (specs
->unsigned_p
)
7819 specs
->type
= unsigned_char_type_node
;
7821 specs
->type
= char_type_node
;
7822 if (specs
->complex_p
)
7824 pedwarn (input_location
, OPT_pedantic
,
7825 "ISO C does not support complex integer types");
7826 specs
->type
= build_complex_type (specs
->type
);
7830 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
7831 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7832 if (specs
->long_long_p
)
7833 specs
->type
= (specs
->unsigned_p
7834 ? long_long_unsigned_type_node
7835 : long_long_integer_type_node
);
7836 else if (specs
->long_p
)
7837 specs
->type
= (specs
->unsigned_p
7838 ? long_unsigned_type_node
7839 : long_integer_type_node
);
7840 else if (specs
->short_p
)
7841 specs
->type
= (specs
->unsigned_p
7842 ? short_unsigned_type_node
7843 : short_integer_type_node
);
7845 specs
->type
= (specs
->unsigned_p
7846 ? unsigned_type_node
7847 : integer_type_node
);
7848 if (specs
->complex_p
)
7850 pedwarn (input_location
, OPT_pedantic
,
7851 "ISO C does not support complex integer types");
7852 specs
->type
= build_complex_type (specs
->type
);
7856 gcc_assert (!specs
->long_p
&& !specs
->short_p
7857 && !specs
->signed_p
&& !specs
->unsigned_p
);
7858 specs
->type
= (specs
->complex_p
7859 ? complex_float_type_node
7863 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
7864 && !specs
->signed_p
&& !specs
->unsigned_p
);
7867 specs
->type
= (specs
->complex_p
7868 ? complex_long_double_type_node
7869 : long_double_type_node
);
7873 specs
->type
= (specs
->complex_p
7874 ? complex_double_type_node
7875 : double_type_node
);
7881 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7882 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
7883 if (specs
->typespec_word
== cts_dfloat32
)
7884 specs
->type
= dfloat32_type_node
;
7885 else if (specs
->typespec_word
== cts_dfloat64
)
7886 specs
->type
= dfloat64_type_node
;
7888 specs
->type
= dfloat128_type_node
;
7891 gcc_assert (!specs
->complex_p
);
7892 if (specs
->saturating_p
)
7894 if (specs
->long_long_p
)
7895 specs
->type
= specs
->unsigned_p
7896 ? sat_unsigned_long_long_fract_type_node
7897 : sat_long_long_fract_type_node
;
7898 else if (specs
->long_p
)
7899 specs
->type
= specs
->unsigned_p
7900 ? sat_unsigned_long_fract_type_node
7901 : sat_long_fract_type_node
;
7902 else if (specs
->short_p
)
7903 specs
->type
= specs
->unsigned_p
7904 ? sat_unsigned_short_fract_type_node
7905 : sat_short_fract_type_node
;
7907 specs
->type
= specs
->unsigned_p
7908 ? sat_unsigned_fract_type_node
7909 : sat_fract_type_node
;
7913 if (specs
->long_long_p
)
7914 specs
->type
= specs
->unsigned_p
7915 ? unsigned_long_long_fract_type_node
7916 : long_long_fract_type_node
;
7917 else if (specs
->long_p
)
7918 specs
->type
= specs
->unsigned_p
7919 ? unsigned_long_fract_type_node
7920 : long_fract_type_node
;
7921 else if (specs
->short_p
)
7922 specs
->type
= specs
->unsigned_p
7923 ? unsigned_short_fract_type_node
7924 : short_fract_type_node
;
7926 specs
->type
= specs
->unsigned_p
7927 ? unsigned_fract_type_node
7932 gcc_assert (!specs
->complex_p
);
7933 if (specs
->saturating_p
)
7935 if (specs
->long_long_p
)
7936 specs
->type
= specs
->unsigned_p
7937 ? sat_unsigned_long_long_accum_type_node
7938 : sat_long_long_accum_type_node
;
7939 else if (specs
->long_p
)
7940 specs
->type
= specs
->unsigned_p
7941 ? sat_unsigned_long_accum_type_node
7942 : sat_long_accum_type_node
;
7943 else if (specs
->short_p
)
7944 specs
->type
= specs
->unsigned_p
7945 ? sat_unsigned_short_accum_type_node
7946 : sat_short_accum_type_node
;
7948 specs
->type
= specs
->unsigned_p
7949 ? sat_unsigned_accum_type_node
7950 : sat_accum_type_node
;
7954 if (specs
->long_long_p
)
7955 specs
->type
= specs
->unsigned_p
7956 ? unsigned_long_long_accum_type_node
7957 : long_long_accum_type_node
;
7958 else if (specs
->long_p
)
7959 specs
->type
= specs
->unsigned_p
7960 ? unsigned_long_accum_type_node
7961 : long_accum_type_node
;
7962 else if (specs
->short_p
)
7963 specs
->type
= specs
->unsigned_p
7964 ? unsigned_short_accum_type_node
7965 : short_accum_type_node
;
7967 specs
->type
= specs
->unsigned_p
7968 ? unsigned_accum_type_node
7979 /* A subroutine of c_write_global_declarations. Perform final processing
7980 on one file scope's declarations (or the external scope's declarations),
7984 c_write_global_declarations_1 (tree globals
)
7989 /* Process the decls in the order they were written. */
7990 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
7992 /* Check for used but undefined static functions using the C
7993 standard's definition of "used", and set TREE_NO_WARNING so
7994 that check_global_declarations doesn't repeat the check. */
7995 if (TREE_CODE (decl
) == FUNCTION_DECL
7996 && DECL_INITIAL (decl
) == 0
7997 && DECL_EXTERNAL (decl
)
7998 && !TREE_PUBLIC (decl
)
7999 && C_DECL_USED (decl
))
8001 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
8002 TREE_NO_WARNING (decl
) = 1;
8005 wrapup_global_declaration_1 (decl
);
8011 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8012 reconsider
|= wrapup_global_declaration_2 (decl
);
8016 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8017 check_global_declaration_1 (decl
);
8020 /* A subroutine of c_write_global_declarations Emit debug information for each
8021 of the declarations in GLOBALS. */
8024 c_write_global_declarations_2 (tree globals
)
8028 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8029 debug_hooks
->global_decl (decl
);
8032 /* Preserve the external declarations scope across a garbage collect. */
8033 static GTY(()) tree ext_block
;
8036 c_write_global_declarations (void)
8040 /* We don't want to do this if generating a PCH. */
8044 /* Don't waste time on further processing if -fsyntax-only or we've
8045 encountered errors. */
8046 if (flag_syntax_only
|| errorcount
|| sorrycount
|| cpp_errors (parse_in
))
8049 /* Close the external scope. */
8050 ext_block
= pop_scope ();
8052 gcc_assert (!current_scope
);
8056 tree tmp
= BLOCK_VARS (ext_block
);
8058 FILE * stream
= dump_begin (TDI_tu
, &flags
);
8061 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
8062 dump_end (TDI_tu
, stream
);
8066 /* Process all file scopes in this compilation, and the external_scope,
8067 through wrapup_global_declarations and check_global_declarations. */
8068 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
8069 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
8070 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
8072 /* We're done parsing; proceed to optimize and emit assembly.
8073 FIXME: shouldn't be the front end's responsibility to call this. */
8076 /* After cgraph has had a chance to emit everything that's going to
8077 be emitted, output debug information for globals. */
8078 if (errorcount
== 0 && sorrycount
== 0)
8080 timevar_push (TV_SYMOUT
);
8081 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
8082 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
8083 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
8084 timevar_pop (TV_SYMOUT
);
8090 #include "gt-c-decl.h"