1 /* Build expressions with type checking for C compiler.
2 Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file is part of the C front end.
25 It contains routines to build C expressions given their operands,
26 including computing the types of the result, C-specific error checks,
27 and some optimization. */
31 #include "coretypes.h"
35 #include "langhooks.h"
45 #include "tree-iterator.h"
46 #include "tree-gimple.h"
47 #include "tree-flow.h"
49 /* Possible cases of implicit bad conversions. Used to select
50 diagnostic messages in convert_for_assignment. */
59 /* The level of nesting inside "__alignof__". */
62 /* The level of nesting inside "sizeof". */
65 /* The level of nesting inside "typeof". */
68 struct c_label_context_se
*label_context_stack_se
;
69 struct c_label_context_vm
*label_context_stack_vm
;
71 /* Nonzero if we've already printed a "missing braces around initializer"
72 message within this initializer. */
73 static int missing_braces_mentioned
;
75 static int require_constant_value
;
76 static int require_constant_elements
;
78 static bool null_pointer_constant_p (tree
);
79 static tree
qualify_type (tree
, tree
);
80 static int tagged_types_tu_compatible_p (tree
, tree
);
81 static int comp_target_types (tree
, tree
);
82 static int function_types_compatible_p (tree
, tree
);
83 static int type_lists_compatible_p (tree
, tree
);
84 static tree
decl_constant_value_for_broken_optimization (tree
);
85 static tree
lookup_field (tree
, tree
);
86 static tree
convert_arguments (tree
, tree
, tree
, tree
);
87 static tree
pointer_diff (tree
, tree
);
88 static tree
convert_for_assignment (tree
, tree
, enum impl_conv
, tree
, tree
,
90 static tree
valid_compound_expr_initializer (tree
, tree
);
91 static void push_string (const char *);
92 static void push_member_name (tree
);
93 static void push_array_bounds (int);
94 static int spelling_length (void);
95 static char *print_spelling (char *);
96 static void warning_init (const char *);
97 static tree
digest_init (tree
, tree
, bool, int);
98 static void output_init_element (tree
, bool, tree
, tree
, int);
99 static void output_pending_init_elements (int);
100 static int set_designator (int);
101 static void push_range_stack (tree
);
102 static void add_pending_init (tree
, tree
);
103 static void set_nonincremental_init (void);
104 static void set_nonincremental_init_from_string (tree
);
105 static tree
find_init_member (tree
);
106 static void readonly_error (tree
, enum lvalue_use
);
107 static int lvalue_or_else (tree
, enum lvalue_use
);
108 static int lvalue_p (tree
);
109 static void record_maybe_used_decl (tree
);
110 static int comptypes_internal (tree
, tree
);
112 /* Return true if EXP is a null pointer constant, false otherwise. */
115 null_pointer_constant_p (tree expr
)
117 /* This should really operate on c_expr structures, but they aren't
118 yet available everywhere required. */
119 tree type
= TREE_TYPE (expr
);
120 return (TREE_CODE (expr
) == INTEGER_CST
121 && !TREE_CONSTANT_OVERFLOW (expr
)
122 && integer_zerop (expr
)
123 && (INTEGRAL_TYPE_P (type
)
124 || (TREE_CODE (type
) == POINTER_TYPE
125 && VOID_TYPE_P (TREE_TYPE (type
))
126 && TYPE_QUALS (TREE_TYPE (type
)) == TYPE_UNQUALIFIED
)));
128 \f/* This is a cache to hold if two types are compatible or not. */
130 struct tagged_tu_seen_cache
{
131 const struct tagged_tu_seen_cache
* next
;
134 /* The return value of tagged_types_tu_compatible_p if we had seen
135 these two types already. */
139 static const struct tagged_tu_seen_cache
* tagged_tu_seen_base
;
140 static void free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache
*);
142 /* Do `exp = require_complete_type (exp);' to make sure exp
143 does not have an incomplete type. (That includes void types.) */
146 require_complete_type (tree value
)
148 tree type
= TREE_TYPE (value
);
150 if (value
== error_mark_node
|| type
== error_mark_node
)
151 return error_mark_node
;
153 /* First, detect a valid value with a complete type. */
154 if (COMPLETE_TYPE_P (type
))
157 c_incomplete_type_error (value
, type
);
158 return error_mark_node
;
161 /* Print an error message for invalid use of an incomplete type.
162 VALUE is the expression that was used (or 0 if that isn't known)
163 and TYPE is the type that was invalid. */
166 c_incomplete_type_error (tree value
, tree type
)
168 const char *type_code_string
;
170 /* Avoid duplicate error message. */
171 if (TREE_CODE (type
) == ERROR_MARK
)
174 if (value
!= 0 && (TREE_CODE (value
) == VAR_DECL
175 || TREE_CODE (value
) == PARM_DECL
))
176 error ("%qD has an incomplete type", value
);
180 /* We must print an error message. Be clever about what it says. */
182 switch (TREE_CODE (type
))
185 type_code_string
= "struct";
189 type_code_string
= "union";
193 type_code_string
= "enum";
197 error ("invalid use of void expression");
201 if (TYPE_DOMAIN (type
))
203 if (TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL
)
205 error ("invalid use of flexible array member");
208 type
= TREE_TYPE (type
);
211 error ("invalid use of array with unspecified bounds");
218 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
219 error ("invalid use of undefined type %<%s %E%>",
220 type_code_string
, TYPE_NAME (type
));
222 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
223 error ("invalid use of incomplete typedef %qD", TYPE_NAME (type
));
227 /* Given a type, apply default promotions wrt unnamed function
228 arguments and return the new type. */
231 c_type_promotes_to (tree type
)
233 if (TYPE_MAIN_VARIANT (type
) == float_type_node
)
234 return double_type_node
;
236 if (c_promoting_integer_type_p (type
))
238 /* Preserve unsignedness if not really getting any wider. */
239 if (TYPE_UNSIGNED (type
)
240 && (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)))
241 return unsigned_type_node
;
242 return integer_type_node
;
248 /* Return a variant of TYPE which has all the type qualifiers of LIKE
249 as well as those of TYPE. */
252 qualify_type (tree type
, tree like
)
254 return c_build_qualified_type (type
,
255 TYPE_QUALS (type
) | TYPE_QUALS (like
));
258 /* Return the composite type of two compatible types.
260 We assume that comptypes has already been done and returned
261 nonzero; if that isn't so, this may crash. In particular, we
262 assume that qualifiers match. */
265 composite_type (tree t1
, tree t2
)
267 enum tree_code code1
;
268 enum tree_code code2
;
271 /* Save time if the two types are the same. */
273 if (t1
== t2
) return t1
;
275 /* If one type is nonsense, use the other. */
276 if (t1
== error_mark_node
)
278 if (t2
== error_mark_node
)
281 code1
= TREE_CODE (t1
);
282 code2
= TREE_CODE (t2
);
284 /* Merge the attributes. */
285 attributes
= targetm
.merge_type_attributes (t1
, t2
);
287 /* If one is an enumerated type and the other is the compatible
288 integer type, the composite type might be either of the two
289 (DR#013 question 3). For consistency, use the enumerated type as
290 the composite type. */
292 if (code1
== ENUMERAL_TYPE
&& code2
== INTEGER_TYPE
)
294 if (code2
== ENUMERAL_TYPE
&& code1
== INTEGER_TYPE
)
297 gcc_assert (code1
== code2
);
302 /* For two pointers, do this recursively on the target type. */
304 tree pointed_to_1
= TREE_TYPE (t1
);
305 tree pointed_to_2
= TREE_TYPE (t2
);
306 tree target
= composite_type (pointed_to_1
, pointed_to_2
);
307 t1
= build_pointer_type (target
);
308 t1
= build_type_attribute_variant (t1
, attributes
);
309 return qualify_type (t1
, t2
);
314 tree elt
= composite_type (TREE_TYPE (t1
), TREE_TYPE (t2
));
317 tree d1
= TYPE_DOMAIN (t1
);
318 tree d2
= TYPE_DOMAIN (t2
);
319 bool d1_variable
, d2_variable
;
320 bool d1_zero
, d2_zero
;
322 /* We should not have any type quals on arrays at all. */
323 gcc_assert (!TYPE_QUALS (t1
) && !TYPE_QUALS (t2
));
325 d1_zero
= d1
== 0 || !TYPE_MAX_VALUE (d1
);
326 d2_zero
= d2
== 0 || !TYPE_MAX_VALUE (d2
);
328 d1_variable
= (!d1_zero
329 && (TREE_CODE (TYPE_MIN_VALUE (d1
)) != INTEGER_CST
330 || TREE_CODE (TYPE_MAX_VALUE (d1
)) != INTEGER_CST
));
331 d2_variable
= (!d2_zero
332 && (TREE_CODE (TYPE_MIN_VALUE (d2
)) != INTEGER_CST
333 || TREE_CODE (TYPE_MAX_VALUE (d2
)) != INTEGER_CST
));
335 /* Save space: see if the result is identical to one of the args. */
336 if (elt
== TREE_TYPE (t1
) && TYPE_DOMAIN (t1
)
337 && (d2_variable
|| d2_zero
|| !d1_variable
))
338 return build_type_attribute_variant (t1
, attributes
);
339 if (elt
== TREE_TYPE (t2
) && TYPE_DOMAIN (t2
)
340 && (d1_variable
|| d1_zero
|| !d2_variable
))
341 return build_type_attribute_variant (t2
, attributes
);
343 if (elt
== TREE_TYPE (t1
) && !TYPE_DOMAIN (t2
) && !TYPE_DOMAIN (t1
))
344 return build_type_attribute_variant (t1
, attributes
);
345 if (elt
== TREE_TYPE (t2
) && !TYPE_DOMAIN (t2
) && !TYPE_DOMAIN (t1
))
346 return build_type_attribute_variant (t2
, attributes
);
348 /* Merge the element types, and have a size if either arg has
349 one. We may have qualifiers on the element types. To set
350 up TYPE_MAIN_VARIANT correctly, we need to form the
351 composite of the unqualified types and add the qualifiers
353 quals
= TYPE_QUALS (strip_array_types (elt
));
354 unqual_elt
= c_build_qualified_type (elt
, TYPE_UNQUALIFIED
);
355 t1
= build_array_type (unqual_elt
,
356 TYPE_DOMAIN ((TYPE_DOMAIN (t1
)
362 t1
= c_build_qualified_type (t1
, quals
);
363 return build_type_attribute_variant (t1
, attributes
);
367 /* Function types: prefer the one that specified arg types.
368 If both do, merge the arg types. Also merge the return types. */
370 tree valtype
= composite_type (TREE_TYPE (t1
), TREE_TYPE (t2
));
371 tree p1
= TYPE_ARG_TYPES (t1
);
372 tree p2
= TYPE_ARG_TYPES (t2
);
377 /* Save space: see if the result is identical to one of the args. */
378 if (valtype
== TREE_TYPE (t1
) && !TYPE_ARG_TYPES (t2
))
379 return build_type_attribute_variant (t1
, attributes
);
380 if (valtype
== TREE_TYPE (t2
) && !TYPE_ARG_TYPES (t1
))
381 return build_type_attribute_variant (t2
, attributes
);
383 /* Simple way if one arg fails to specify argument types. */
384 if (TYPE_ARG_TYPES (t1
) == 0)
386 t1
= build_function_type (valtype
, TYPE_ARG_TYPES (t2
));
387 t1
= build_type_attribute_variant (t1
, attributes
);
388 return qualify_type (t1
, t2
);
390 if (TYPE_ARG_TYPES (t2
) == 0)
392 t1
= build_function_type (valtype
, TYPE_ARG_TYPES (t1
));
393 t1
= build_type_attribute_variant (t1
, attributes
);
394 return qualify_type (t1
, t2
);
397 /* If both args specify argument types, we must merge the two
398 lists, argument by argument. */
399 /* Tell global_bindings_p to return false so that variable_size
400 doesn't die on VLAs in parameter types. */
401 c_override_global_bindings_to_false
= true;
403 len
= list_length (p1
);
406 for (i
= 0; i
< len
; i
++)
407 newargs
= tree_cons (NULL_TREE
, NULL_TREE
, newargs
);
412 p1
= TREE_CHAIN (p1
), p2
= TREE_CHAIN (p2
), n
= TREE_CHAIN (n
))
414 /* A null type means arg type is not specified.
415 Take whatever the other function type has. */
416 if (TREE_VALUE (p1
) == 0)
418 TREE_VALUE (n
) = TREE_VALUE (p2
);
421 if (TREE_VALUE (p2
) == 0)
423 TREE_VALUE (n
) = TREE_VALUE (p1
);
427 /* Given wait (union {union wait *u; int *i} *)
428 and wait (union wait *),
429 prefer union wait * as type of parm. */
430 if (TREE_CODE (TREE_VALUE (p1
)) == UNION_TYPE
431 && TREE_VALUE (p1
) != TREE_VALUE (p2
))
434 tree mv2
= TREE_VALUE (p2
);
435 if (mv2
&& mv2
!= error_mark_node
436 && TREE_CODE (mv2
) != ARRAY_TYPE
)
437 mv2
= TYPE_MAIN_VARIANT (mv2
);
438 for (memb
= TYPE_FIELDS (TREE_VALUE (p1
));
439 memb
; memb
= TREE_CHAIN (memb
))
441 tree mv3
= TREE_TYPE (memb
);
442 if (mv3
&& mv3
!= error_mark_node
443 && TREE_CODE (mv3
) != ARRAY_TYPE
)
444 mv3
= TYPE_MAIN_VARIANT (mv3
);
445 if (comptypes (mv3
, mv2
))
447 TREE_VALUE (n
) = composite_type (TREE_TYPE (memb
),
450 pedwarn ("function types not truly compatible in ISO C");
455 if (TREE_CODE (TREE_VALUE (p2
)) == UNION_TYPE
456 && TREE_VALUE (p2
) != TREE_VALUE (p1
))
459 tree mv1
= TREE_VALUE (p1
);
460 if (mv1
&& mv1
!= error_mark_node
461 && TREE_CODE (mv1
) != ARRAY_TYPE
)
462 mv1
= TYPE_MAIN_VARIANT (mv1
);
463 for (memb
= TYPE_FIELDS (TREE_VALUE (p2
));
464 memb
; memb
= TREE_CHAIN (memb
))
466 tree mv3
= TREE_TYPE (memb
);
467 if (mv3
&& mv3
!= error_mark_node
468 && TREE_CODE (mv3
) != ARRAY_TYPE
)
469 mv3
= TYPE_MAIN_VARIANT (mv3
);
470 if (comptypes (mv3
, mv1
))
472 TREE_VALUE (n
) = composite_type (TREE_TYPE (memb
),
475 pedwarn ("function types not truly compatible in ISO C");
480 TREE_VALUE (n
) = composite_type (TREE_VALUE (p1
), TREE_VALUE (p2
));
484 c_override_global_bindings_to_false
= false;
485 t1
= build_function_type (valtype
, newargs
);
486 t1
= qualify_type (t1
, t2
);
487 /* ... falls through ... */
491 return build_type_attribute_variant (t1
, attributes
);
496 /* Return the type of a conditional expression between pointers to
497 possibly differently qualified versions of compatible types.
499 We assume that comp_target_types has already been done and returned
500 nonzero; if that isn't so, this may crash. */
503 common_pointer_type (tree t1
, tree t2
)
506 tree pointed_to_1
, mv1
;
507 tree pointed_to_2
, mv2
;
510 /* Save time if the two types are the same. */
512 if (t1
== t2
) return t1
;
514 /* If one type is nonsense, use the other. */
515 if (t1
== error_mark_node
)
517 if (t2
== error_mark_node
)
520 gcc_assert (TREE_CODE (t1
) == POINTER_TYPE
521 && TREE_CODE (t2
) == POINTER_TYPE
);
523 /* Merge the attributes. */
524 attributes
= targetm
.merge_type_attributes (t1
, t2
);
526 /* Find the composite type of the target types, and combine the
527 qualifiers of the two types' targets. Do not lose qualifiers on
528 array element types by taking the TYPE_MAIN_VARIANT. */
529 mv1
= pointed_to_1
= TREE_TYPE (t1
);
530 mv2
= pointed_to_2
= TREE_TYPE (t2
);
531 if (TREE_CODE (mv1
) != ARRAY_TYPE
)
532 mv1
= TYPE_MAIN_VARIANT (pointed_to_1
);
533 if (TREE_CODE (mv2
) != ARRAY_TYPE
)
534 mv2
= TYPE_MAIN_VARIANT (pointed_to_2
);
535 target
= composite_type (mv1
, mv2
);
536 t1
= build_pointer_type (c_build_qualified_type
538 TYPE_QUALS (pointed_to_1
) |
539 TYPE_QUALS (pointed_to_2
)));
540 return build_type_attribute_variant (t1
, attributes
);
543 /* Return the common type for two arithmetic types under the usual
544 arithmetic conversions. The default conversions have already been
545 applied, and enumerated types converted to their compatible integer
546 types. The resulting type is unqualified and has no attributes.
548 This is the type for the result of most arithmetic operations
549 if the operands have the given two types. */
552 c_common_type (tree t1
, tree t2
)
554 enum tree_code code1
;
555 enum tree_code code2
;
557 /* If one type is nonsense, use the other. */
558 if (t1
== error_mark_node
)
560 if (t2
== error_mark_node
)
563 if (TYPE_QUALS (t1
) != TYPE_UNQUALIFIED
)
564 t1
= TYPE_MAIN_VARIANT (t1
);
566 if (TYPE_QUALS (t2
) != TYPE_UNQUALIFIED
)
567 t2
= TYPE_MAIN_VARIANT (t2
);
569 if (TYPE_ATTRIBUTES (t1
) != NULL_TREE
)
570 t1
= build_type_attribute_variant (t1
, NULL_TREE
);
572 if (TYPE_ATTRIBUTES (t2
) != NULL_TREE
)
573 t2
= build_type_attribute_variant (t2
, NULL_TREE
);
575 /* Save time if the two types are the same. */
577 if (t1
== t2
) return t1
;
579 code1
= TREE_CODE (t1
);
580 code2
= TREE_CODE (t2
);
582 gcc_assert (code1
== VECTOR_TYPE
|| code1
== COMPLEX_TYPE
583 || code1
== REAL_TYPE
|| code1
== INTEGER_TYPE
);
584 gcc_assert (code2
== VECTOR_TYPE
|| code2
== COMPLEX_TYPE
585 || code2
== REAL_TYPE
|| code2
== INTEGER_TYPE
);
587 /* If one type is a vector type, return that type. (How the usual
588 arithmetic conversions apply to the vector types extension is not
589 precisely specified.) */
590 if (code1
== VECTOR_TYPE
)
593 if (code2
== VECTOR_TYPE
)
596 /* If one type is complex, form the common type of the non-complex
597 components, then make that complex. Use T1 or T2 if it is the
599 if (code1
== COMPLEX_TYPE
|| code2
== COMPLEX_TYPE
)
601 tree subtype1
= code1
== COMPLEX_TYPE
? TREE_TYPE (t1
) : t1
;
602 tree subtype2
= code2
== COMPLEX_TYPE
? TREE_TYPE (t2
) : t2
;
603 tree subtype
= c_common_type (subtype1
, subtype2
);
605 if (code1
== COMPLEX_TYPE
&& TREE_TYPE (t1
) == subtype
)
607 else if (code2
== COMPLEX_TYPE
&& TREE_TYPE (t2
) == subtype
)
610 return build_complex_type (subtype
);
613 /* If only one is real, use it as the result. */
615 if (code1
== REAL_TYPE
&& code2
!= REAL_TYPE
)
618 if (code2
== REAL_TYPE
&& code1
!= REAL_TYPE
)
621 /* If both are real and either are decimal floating point types, use
622 the decimal floating point type with the greater precision. */
624 if (code1
== REAL_TYPE
&& code2
== REAL_TYPE
)
626 if (TYPE_MAIN_VARIANT (t1
) == dfloat128_type_node
627 || TYPE_MAIN_VARIANT (t2
) == dfloat128_type_node
)
628 return dfloat128_type_node
;
629 else if (TYPE_MAIN_VARIANT (t1
) == dfloat64_type_node
630 || TYPE_MAIN_VARIANT (t2
) == dfloat64_type_node
)
631 return dfloat64_type_node
;
632 else if (TYPE_MAIN_VARIANT (t1
) == dfloat32_type_node
633 || TYPE_MAIN_VARIANT (t2
) == dfloat32_type_node
)
634 return dfloat32_type_node
;
637 /* Both real or both integers; use the one with greater precision. */
639 if (TYPE_PRECISION (t1
) > TYPE_PRECISION (t2
))
641 else if (TYPE_PRECISION (t2
) > TYPE_PRECISION (t1
))
644 /* Same precision. Prefer long longs to longs to ints when the
645 same precision, following the C99 rules on integer type rank
646 (which are equivalent to the C90 rules for C90 types). */
648 if (TYPE_MAIN_VARIANT (t1
) == long_long_unsigned_type_node
649 || TYPE_MAIN_VARIANT (t2
) == long_long_unsigned_type_node
)
650 return long_long_unsigned_type_node
;
652 if (TYPE_MAIN_VARIANT (t1
) == long_long_integer_type_node
653 || TYPE_MAIN_VARIANT (t2
) == long_long_integer_type_node
)
655 if (TYPE_UNSIGNED (t1
) || TYPE_UNSIGNED (t2
))
656 return long_long_unsigned_type_node
;
658 return long_long_integer_type_node
;
661 if (TYPE_MAIN_VARIANT (t1
) == long_unsigned_type_node
662 || TYPE_MAIN_VARIANT (t2
) == long_unsigned_type_node
)
663 return long_unsigned_type_node
;
665 if (TYPE_MAIN_VARIANT (t1
) == long_integer_type_node
666 || TYPE_MAIN_VARIANT (t2
) == long_integer_type_node
)
668 /* But preserve unsignedness from the other type,
669 since long cannot hold all the values of an unsigned int. */
670 if (TYPE_UNSIGNED (t1
) || TYPE_UNSIGNED (t2
))
671 return long_unsigned_type_node
;
673 return long_integer_type_node
;
676 /* Likewise, prefer long double to double even if same size. */
677 if (TYPE_MAIN_VARIANT (t1
) == long_double_type_node
678 || TYPE_MAIN_VARIANT (t2
) == long_double_type_node
)
679 return long_double_type_node
;
681 /* Otherwise prefer the unsigned one. */
683 if (TYPE_UNSIGNED (t1
))
689 /* Wrapper around c_common_type that is used by c-common.c and other
690 front end optimizations that remove promotions. ENUMERAL_TYPEs
691 are allowed here and are converted to their compatible integer types.
692 BOOLEAN_TYPEs are allowed here and return either boolean_type_node or
693 preferably a non-Boolean type as the common type. */
695 common_type (tree t1
, tree t2
)
697 if (TREE_CODE (t1
) == ENUMERAL_TYPE
)
698 t1
= c_common_type_for_size (TYPE_PRECISION (t1
), 1);
699 if (TREE_CODE (t2
) == ENUMERAL_TYPE
)
700 t2
= c_common_type_for_size (TYPE_PRECISION (t2
), 1);
702 /* If both types are BOOLEAN_TYPE, then return boolean_type_node. */
703 if (TREE_CODE (t1
) == BOOLEAN_TYPE
704 && TREE_CODE (t2
) == BOOLEAN_TYPE
)
705 return boolean_type_node
;
707 /* If either type is BOOLEAN_TYPE, then return the other. */
708 if (TREE_CODE (t1
) == BOOLEAN_TYPE
)
710 if (TREE_CODE (t2
) == BOOLEAN_TYPE
)
713 return c_common_type (t1
, t2
);
716 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
717 or various other operations. Return 2 if they are compatible
718 but a warning may be needed if you use them together. */
721 comptypes (tree type1
, tree type2
)
723 const struct tagged_tu_seen_cache
* tagged_tu_seen_base1
= tagged_tu_seen_base
;
726 val
= comptypes_internal (type1
, type2
);
727 free_all_tagged_tu_seen_up_to (tagged_tu_seen_base1
);
731 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
732 or various other operations. Return 2 if they are compatible
733 but a warning may be needed if you use them together. This
734 differs from comptypes, in that we don't free the seen types. */
737 comptypes_internal (tree type1
, tree type2
)
743 /* Suppress errors caused by previously reported errors. */
745 if (t1
== t2
|| !t1
|| !t2
746 || TREE_CODE (t1
) == ERROR_MARK
|| TREE_CODE (t2
) == ERROR_MARK
)
749 /* If either type is the internal version of sizetype, return the
751 if (TREE_CODE (t1
) == INTEGER_TYPE
&& TYPE_IS_SIZETYPE (t1
)
752 && TYPE_ORIG_SIZE_TYPE (t1
))
753 t1
= TYPE_ORIG_SIZE_TYPE (t1
);
755 if (TREE_CODE (t2
) == INTEGER_TYPE
&& TYPE_IS_SIZETYPE (t2
)
756 && TYPE_ORIG_SIZE_TYPE (t2
))
757 t2
= TYPE_ORIG_SIZE_TYPE (t2
);
760 /* Enumerated types are compatible with integer types, but this is
761 not transitive: two enumerated types in the same translation unit
762 are compatible with each other only if they are the same type. */
764 if (TREE_CODE (t1
) == ENUMERAL_TYPE
&& TREE_CODE (t2
) != ENUMERAL_TYPE
)
765 t1
= c_common_type_for_size (TYPE_PRECISION (t1
), TYPE_UNSIGNED (t1
));
766 else if (TREE_CODE (t2
) == ENUMERAL_TYPE
&& TREE_CODE (t1
) != ENUMERAL_TYPE
)
767 t2
= c_common_type_for_size (TYPE_PRECISION (t2
), TYPE_UNSIGNED (t2
));
772 /* Different classes of types can't be compatible. */
774 if (TREE_CODE (t1
) != TREE_CODE (t2
))
777 /* Qualifiers must match. C99 6.7.3p9 */
779 if (TYPE_QUALS (t1
) != TYPE_QUALS (t2
))
782 /* Allow for two different type nodes which have essentially the same
783 definition. Note that we already checked for equality of the type
784 qualifiers (just above). */
786 if (TREE_CODE (t1
) != ARRAY_TYPE
787 && TYPE_MAIN_VARIANT (t1
) == TYPE_MAIN_VARIANT (t2
))
790 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
791 if (!(attrval
= targetm
.comp_type_attributes (t1
, t2
)))
794 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
797 switch (TREE_CODE (t1
))
800 /* Do not remove mode or aliasing information. */
801 if (TYPE_MODE (t1
) != TYPE_MODE (t2
)
802 || TYPE_REF_CAN_ALIAS_ALL (t1
) != TYPE_REF_CAN_ALIAS_ALL (t2
))
804 val
= (TREE_TYPE (t1
) == TREE_TYPE (t2
)
805 ? 1 : comptypes_internal (TREE_TYPE (t1
), TREE_TYPE (t2
)));
809 val
= function_types_compatible_p (t1
, t2
);
814 tree d1
= TYPE_DOMAIN (t1
);
815 tree d2
= TYPE_DOMAIN (t2
);
816 bool d1_variable
, d2_variable
;
817 bool d1_zero
, d2_zero
;
820 /* Target types must match incl. qualifiers. */
821 if (TREE_TYPE (t1
) != TREE_TYPE (t2
)
822 && 0 == (val
= comptypes_internal (TREE_TYPE (t1
), TREE_TYPE (t2
))))
825 /* Sizes must match unless one is missing or variable. */
826 if (d1
== 0 || d2
== 0 || d1
== d2
)
829 d1_zero
= !TYPE_MAX_VALUE (d1
);
830 d2_zero
= !TYPE_MAX_VALUE (d2
);
832 d1_variable
= (!d1_zero
833 && (TREE_CODE (TYPE_MIN_VALUE (d1
)) != INTEGER_CST
834 || TREE_CODE (TYPE_MAX_VALUE (d1
)) != INTEGER_CST
));
835 d2_variable
= (!d2_zero
836 && (TREE_CODE (TYPE_MIN_VALUE (d2
)) != INTEGER_CST
837 || TREE_CODE (TYPE_MAX_VALUE (d2
)) != INTEGER_CST
));
839 if (d1_variable
|| d2_variable
)
841 if (d1_zero
&& d2_zero
)
843 if (d1_zero
|| d2_zero
844 || !tree_int_cst_equal (TYPE_MIN_VALUE (d1
), TYPE_MIN_VALUE (d2
))
845 || !tree_int_cst_equal (TYPE_MAX_VALUE (d1
), TYPE_MAX_VALUE (d2
)))
854 if (val
!= 1 && !same_translation_unit_p (t1
, t2
))
857 return tagged_types_tu_compatible_p (t1
, t2
);
858 val
= tagged_types_tu_compatible_p (t1
, t2
);
863 val
= TYPE_VECTOR_SUBPARTS (t1
) == TYPE_VECTOR_SUBPARTS (t2
)
864 && comptypes_internal (TREE_TYPE (t1
), TREE_TYPE (t2
));
870 return attrval
== 2 && val
== 1 ? 2 : val
;
873 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
874 ignoring their qualifiers. */
877 comp_target_types (tree ttl
, tree ttr
)
882 /* Do not lose qualifiers on element types of array types that are
883 pointer targets by taking their TYPE_MAIN_VARIANT. */
884 mvl
= TREE_TYPE (ttl
);
885 mvr
= TREE_TYPE (ttr
);
886 if (TREE_CODE (mvl
) != ARRAY_TYPE
)
887 mvl
= TYPE_MAIN_VARIANT (mvl
);
888 if (TREE_CODE (mvr
) != ARRAY_TYPE
)
889 mvr
= TYPE_MAIN_VARIANT (mvr
);
890 val
= comptypes (mvl
, mvr
);
892 if (val
== 2 && pedantic
)
893 pedwarn ("types are not quite compatible");
897 /* Subroutines of `comptypes'. */
899 /* Determine whether two trees derive from the same translation unit.
900 If the CONTEXT chain ends in a null, that tree's context is still
901 being parsed, so if two trees have context chains ending in null,
902 they're in the same translation unit. */
904 same_translation_unit_p (tree t1
, tree t2
)
906 while (t1
&& TREE_CODE (t1
) != TRANSLATION_UNIT_DECL
)
907 switch (TREE_CODE_CLASS (TREE_CODE (t1
)))
909 case tcc_declaration
:
910 t1
= DECL_CONTEXT (t1
); break;
912 t1
= TYPE_CONTEXT (t1
); break;
913 case tcc_exceptional
:
914 t1
= BLOCK_SUPERCONTEXT (t1
); break; /* assume block */
915 default: gcc_unreachable ();
918 while (t2
&& TREE_CODE (t2
) != TRANSLATION_UNIT_DECL
)
919 switch (TREE_CODE_CLASS (TREE_CODE (t2
)))
921 case tcc_declaration
:
922 t2
= DECL_CONTEXT (t2
); break;
924 t2
= TYPE_CONTEXT (t2
); break;
925 case tcc_exceptional
:
926 t2
= BLOCK_SUPERCONTEXT (t2
); break; /* assume block */
927 default: gcc_unreachable ();
933 /* Allocate the seen two types, assuming that they are compatible. */
935 static struct tagged_tu_seen_cache
*
936 alloc_tagged_tu_seen_cache (tree t1
, tree t2
)
938 struct tagged_tu_seen_cache
*tu
= XNEW (struct tagged_tu_seen_cache
);
939 tu
->next
= tagged_tu_seen_base
;
943 tagged_tu_seen_base
= tu
;
945 /* The C standard says that two structures in different translation
946 units are compatible with each other only if the types of their
947 fields are compatible (among other things). We assume that they
948 are compatible until proven otherwise when building the cache.
949 An example where this can occur is:
954 If we are comparing this against a similar struct in another TU,
955 and did not assume they were compatible, we end up with an infinite
961 /* Free the seen types until we get to TU_TIL. */
964 free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache
*tu_til
)
966 const struct tagged_tu_seen_cache
*tu
= tagged_tu_seen_base
;
969 struct tagged_tu_seen_cache
*tu1
= (struct tagged_tu_seen_cache
*)tu
;
973 tagged_tu_seen_base
= tu_til
;
976 /* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are
977 compatible. If the two types are not the same (which has been
978 checked earlier), this can only happen when multiple translation
979 units are being compiled. See C99 6.2.7 paragraph 1 for the exact
983 tagged_types_tu_compatible_p (tree t1
, tree t2
)
986 bool needs_warning
= false;
988 /* We have to verify that the tags of the types are the same. This
989 is harder than it looks because this may be a typedef, so we have
990 to go look at the original type. It may even be a typedef of a
992 In the case of compiler-created builtin structs the TYPE_DECL
993 may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */
994 while (TYPE_NAME (t1
)
995 && TREE_CODE (TYPE_NAME (t1
)) == TYPE_DECL
996 && DECL_ORIGINAL_TYPE (TYPE_NAME (t1
)))
997 t1
= DECL_ORIGINAL_TYPE (TYPE_NAME (t1
));
999 while (TYPE_NAME (t2
)
1000 && TREE_CODE (TYPE_NAME (t2
)) == TYPE_DECL
1001 && DECL_ORIGINAL_TYPE (TYPE_NAME (t2
)))
1002 t2
= DECL_ORIGINAL_TYPE (TYPE_NAME (t2
));
1004 /* C90 didn't have the requirement that the two tags be the same. */
1005 if (flag_isoc99
&& TYPE_NAME (t1
) != TYPE_NAME (t2
))
1008 /* C90 didn't say what happened if one or both of the types were
1009 incomplete; we choose to follow C99 rules here, which is that they
1011 if (TYPE_SIZE (t1
) == NULL
1012 || TYPE_SIZE (t2
) == NULL
)
1016 const struct tagged_tu_seen_cache
* tts_i
;
1017 for (tts_i
= tagged_tu_seen_base
; tts_i
!= NULL
; tts_i
= tts_i
->next
)
1018 if (tts_i
->t1
== t1
&& tts_i
->t2
== t2
)
1022 switch (TREE_CODE (t1
))
1026 struct tagged_tu_seen_cache
*tu
= alloc_tagged_tu_seen_cache (t1
, t2
);
1027 /* Speed up the case where the type values are in the same order. */
1028 tree tv1
= TYPE_VALUES (t1
);
1029 tree tv2
= TYPE_VALUES (t2
);
1036 for (;tv1
&& tv2
; tv1
= TREE_CHAIN (tv1
), tv2
= TREE_CHAIN (tv2
))
1038 if (TREE_PURPOSE (tv1
) != TREE_PURPOSE (tv2
))
1040 if (simple_cst_equal (TREE_VALUE (tv1
), TREE_VALUE (tv2
)) != 1)
1047 if (tv1
== NULL_TREE
&& tv2
== NULL_TREE
)
1051 if (tv1
== NULL_TREE
|| tv2
== NULL_TREE
)
1057 if (list_length (TYPE_VALUES (t1
)) != list_length (TYPE_VALUES (t2
)))
1063 for (s1
= TYPE_VALUES (t1
); s1
; s1
= TREE_CHAIN (s1
))
1065 s2
= purpose_member (TREE_PURPOSE (s1
), TYPE_VALUES (t2
));
1067 || simple_cst_equal (TREE_VALUE (s1
), TREE_VALUE (s2
)) != 1)
1078 struct tagged_tu_seen_cache
*tu
= alloc_tagged_tu_seen_cache (t1
, t2
);
1079 if (list_length (TYPE_FIELDS (t1
)) != list_length (TYPE_FIELDS (t2
)))
1085 /* Speed up the common case where the fields are in the same order. */
1086 for (s1
= TYPE_FIELDS (t1
), s2
= TYPE_FIELDS (t2
); s1
&& s2
;
1087 s1
= TREE_CHAIN (s1
), s2
= TREE_CHAIN (s2
))
1092 if (DECL_NAME (s1
) == NULL
1093 || DECL_NAME (s1
) != DECL_NAME (s2
))
1095 result
= comptypes_internal (TREE_TYPE (s1
), TREE_TYPE (s2
));
1102 needs_warning
= true;
1104 if (TREE_CODE (s1
) == FIELD_DECL
1105 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1
),
1106 DECL_FIELD_BIT_OFFSET (s2
)) != 1)
1114 tu
->val
= needs_warning
? 2 : 1;
1118 for (s1
= TYPE_FIELDS (t1
); s1
; s1
= TREE_CHAIN (s1
))
1122 if (DECL_NAME (s1
) != NULL
)
1123 for (s2
= TYPE_FIELDS (t2
); s2
; s2
= TREE_CHAIN (s2
))
1124 if (DECL_NAME (s1
) == DECL_NAME (s2
))
1127 result
= comptypes_internal (TREE_TYPE (s1
), TREE_TYPE (s2
));
1134 needs_warning
= true;
1136 if (TREE_CODE (s1
) == FIELD_DECL
1137 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1
),
1138 DECL_FIELD_BIT_OFFSET (s2
)) != 1)
1150 tu
->val
= needs_warning
? 2 : 10;
1156 struct tagged_tu_seen_cache
*tu
= alloc_tagged_tu_seen_cache (t1
, t2
);
1158 for (s1
= TYPE_FIELDS (t1
), s2
= TYPE_FIELDS (t2
);
1160 s1
= TREE_CHAIN (s1
), s2
= TREE_CHAIN (s2
))
1163 if (TREE_CODE (s1
) != TREE_CODE (s2
)
1164 || DECL_NAME (s1
) != DECL_NAME (s2
))
1166 result
= comptypes_internal (TREE_TYPE (s1
), TREE_TYPE (s2
));
1170 needs_warning
= true;
1172 if (TREE_CODE (s1
) == FIELD_DECL
1173 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1
),
1174 DECL_FIELD_BIT_OFFSET (s2
)) != 1)
1180 tu
->val
= needs_warning
? 2 : 1;
1189 /* Return 1 if two function types F1 and F2 are compatible.
1190 If either type specifies no argument types,
1191 the other must specify a fixed number of self-promoting arg types.
1192 Otherwise, if one type specifies only the number of arguments,
1193 the other must specify that number of self-promoting arg types.
1194 Otherwise, the argument types must match. */
1197 function_types_compatible_p (tree f1
, tree f2
)
1200 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1205 ret1
= TREE_TYPE (f1
);
1206 ret2
= TREE_TYPE (f2
);
1208 /* 'volatile' qualifiers on a function's return type used to mean
1209 the function is noreturn. */
1210 if (TYPE_VOLATILE (ret1
) != TYPE_VOLATILE (ret2
))
1211 pedwarn ("function return types not compatible due to %<volatile%>");
1212 if (TYPE_VOLATILE (ret1
))
1213 ret1
= build_qualified_type (TYPE_MAIN_VARIANT (ret1
),
1214 TYPE_QUALS (ret1
) & ~TYPE_QUAL_VOLATILE
);
1215 if (TYPE_VOLATILE (ret2
))
1216 ret2
= build_qualified_type (TYPE_MAIN_VARIANT (ret2
),
1217 TYPE_QUALS (ret2
) & ~TYPE_QUAL_VOLATILE
);
1218 val
= comptypes_internal (ret1
, ret2
);
1222 args1
= TYPE_ARG_TYPES (f1
);
1223 args2
= TYPE_ARG_TYPES (f2
);
1225 /* An unspecified parmlist matches any specified parmlist
1226 whose argument types don't need default promotions. */
1230 if (!self_promoting_args_p (args2
))
1232 /* If one of these types comes from a non-prototype fn definition,
1233 compare that with the other type's arglist.
1234 If they don't match, ask for a warning (but no error). */
1235 if (TYPE_ACTUAL_ARG_TYPES (f1
)
1236 && 1 != type_lists_compatible_p (args2
, TYPE_ACTUAL_ARG_TYPES (f1
)))
1242 if (!self_promoting_args_p (args1
))
1244 if (TYPE_ACTUAL_ARG_TYPES (f2
)
1245 && 1 != type_lists_compatible_p (args1
, TYPE_ACTUAL_ARG_TYPES (f2
)))
1250 /* Both types have argument lists: compare them and propagate results. */
1251 val1
= type_lists_compatible_p (args1
, args2
);
1252 return val1
!= 1 ? val1
: val
;
1255 /* Check two lists of types for compatibility,
1256 returning 0 for incompatible, 1 for compatible,
1257 or 2 for compatible with warning. */
1260 type_lists_compatible_p (tree args1
, tree args2
)
1262 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1268 tree a1
, mv1
, a2
, mv2
;
1269 if (args1
== 0 && args2
== 0)
1271 /* If one list is shorter than the other,
1272 they fail to match. */
1273 if (args1
== 0 || args2
== 0)
1275 mv1
= a1
= TREE_VALUE (args1
);
1276 mv2
= a2
= TREE_VALUE (args2
);
1277 if (mv1
&& mv1
!= error_mark_node
&& TREE_CODE (mv1
) != ARRAY_TYPE
)
1278 mv1
= TYPE_MAIN_VARIANT (mv1
);
1279 if (mv2
&& mv2
!= error_mark_node
&& TREE_CODE (mv2
) != ARRAY_TYPE
)
1280 mv2
= TYPE_MAIN_VARIANT (mv2
);
1281 /* A null pointer instead of a type
1282 means there is supposed to be an argument
1283 but nothing is specified about what type it has.
1284 So match anything that self-promotes. */
1287 if (c_type_promotes_to (a2
) != a2
)
1292 if (c_type_promotes_to (a1
) != a1
)
1295 /* If one of the lists has an error marker, ignore this arg. */
1296 else if (TREE_CODE (a1
) == ERROR_MARK
1297 || TREE_CODE (a2
) == ERROR_MARK
)
1299 else if (!(newval
= comptypes_internal (mv1
, mv2
)))
1301 /* Allow wait (union {union wait *u; int *i} *)
1302 and wait (union wait *) to be compatible. */
1303 if (TREE_CODE (a1
) == UNION_TYPE
1304 && (TYPE_NAME (a1
) == 0
1305 || TYPE_TRANSPARENT_UNION (a1
))
1306 && TREE_CODE (TYPE_SIZE (a1
)) == INTEGER_CST
1307 && tree_int_cst_equal (TYPE_SIZE (a1
),
1311 for (memb
= TYPE_FIELDS (a1
);
1312 memb
; memb
= TREE_CHAIN (memb
))
1314 tree mv3
= TREE_TYPE (memb
);
1315 if (mv3
&& mv3
!= error_mark_node
1316 && TREE_CODE (mv3
) != ARRAY_TYPE
)
1317 mv3
= TYPE_MAIN_VARIANT (mv3
);
1318 if (comptypes_internal (mv3
, mv2
))
1324 else if (TREE_CODE (a2
) == UNION_TYPE
1325 && (TYPE_NAME (a2
) == 0
1326 || TYPE_TRANSPARENT_UNION (a2
))
1327 && TREE_CODE (TYPE_SIZE (a2
)) == INTEGER_CST
1328 && tree_int_cst_equal (TYPE_SIZE (a2
),
1332 for (memb
= TYPE_FIELDS (a2
);
1333 memb
; memb
= TREE_CHAIN (memb
))
1335 tree mv3
= TREE_TYPE (memb
);
1336 if (mv3
&& mv3
!= error_mark_node
1337 && TREE_CODE (mv3
) != ARRAY_TYPE
)
1338 mv3
= TYPE_MAIN_VARIANT (mv3
);
1339 if (comptypes_internal (mv3
, mv1
))
1349 /* comptypes said ok, but record if it said to warn. */
1353 args1
= TREE_CHAIN (args1
);
1354 args2
= TREE_CHAIN (args2
);
1358 /* Compute the size to increment a pointer by. */
1361 c_size_in_bytes (tree type
)
1363 enum tree_code code
= TREE_CODE (type
);
1365 if (code
== FUNCTION_TYPE
|| code
== VOID_TYPE
|| code
== ERROR_MARK
)
1366 return size_one_node
;
1368 if (!COMPLETE_OR_VOID_TYPE_P (type
))
1370 error ("arithmetic on pointer to an incomplete type");
1371 return size_one_node
;
1374 /* Convert in case a char is more than one unit. */
1375 return size_binop (CEIL_DIV_EXPR
, TYPE_SIZE_UNIT (type
),
1376 size_int (TYPE_PRECISION (char_type_node
)
1380 /* Return either DECL or its known constant value (if it has one). */
1383 decl_constant_value (tree decl
)
1385 if (/* Don't change a variable array bound or initial value to a constant
1386 in a place where a variable is invalid. Note that DECL_INITIAL
1387 isn't valid for a PARM_DECL. */
1388 current_function_decl
!= 0
1389 && TREE_CODE (decl
) != PARM_DECL
1390 && !TREE_THIS_VOLATILE (decl
)
1391 && TREE_READONLY (decl
)
1392 && DECL_INITIAL (decl
) != 0
1393 && TREE_CODE (DECL_INITIAL (decl
)) != ERROR_MARK
1394 /* This is invalid if initial value is not constant.
1395 If it has either a function call, a memory reference,
1396 or a variable, then re-evaluating it could give different results. */
1397 && TREE_CONSTANT (DECL_INITIAL (decl
))
1398 /* Check for cases where this is sub-optimal, even though valid. */
1399 && TREE_CODE (DECL_INITIAL (decl
)) != CONSTRUCTOR
)
1400 return DECL_INITIAL (decl
);
1404 /* Return either DECL or its known constant value (if it has one), but
1405 return DECL if pedantic or DECL has mode BLKmode. This is for
1406 bug-compatibility with the old behavior of decl_constant_value
1407 (before GCC 3.0); every use of this function is a bug and it should
1408 be removed before GCC 3.1. It is not appropriate to use pedantic
1409 in a way that affects optimization, and BLKmode is probably not the
1410 right test for avoiding misoptimizations either. */
1413 decl_constant_value_for_broken_optimization (tree decl
)
1417 if (pedantic
|| DECL_MODE (decl
) == BLKmode
)
1420 ret
= decl_constant_value (decl
);
1421 /* Avoid unwanted tree sharing between the initializer and current
1422 function's body where the tree can be modified e.g. by the
1424 if (ret
!= decl
&& TREE_STATIC (decl
))
1425 ret
= unshare_expr (ret
);
1429 /* Convert the array expression EXP to a pointer. */
1431 array_to_pointer_conversion (tree exp
)
1433 tree orig_exp
= exp
;
1434 tree type
= TREE_TYPE (exp
);
1436 tree restype
= TREE_TYPE (type
);
1439 gcc_assert (TREE_CODE (type
) == ARRAY_TYPE
);
1441 STRIP_TYPE_NOPS (exp
);
1443 if (TREE_NO_WARNING (orig_exp
))
1444 TREE_NO_WARNING (exp
) = 1;
1446 ptrtype
= build_pointer_type (restype
);
1448 if (TREE_CODE (exp
) == INDIRECT_REF
)
1449 return convert (ptrtype
, TREE_OPERAND (exp
, 0));
1451 if (TREE_CODE (exp
) == VAR_DECL
)
1453 /* We are making an ADDR_EXPR of ptrtype. This is a valid
1454 ADDR_EXPR because it's the best way of representing what
1455 happens in C when we take the address of an array and place
1456 it in a pointer to the element type. */
1457 adr
= build1 (ADDR_EXPR
, ptrtype
, exp
);
1458 if (!c_mark_addressable (exp
))
1459 return error_mark_node
;
1460 TREE_SIDE_EFFECTS (adr
) = 0; /* Default would be, same as EXP. */
1464 /* This way is better for a COMPONENT_REF since it can
1465 simplify the offset for a component. */
1466 adr
= build_unary_op (ADDR_EXPR
, exp
, 1);
1467 return convert (ptrtype
, adr
);
1470 /* Convert the function expression EXP to a pointer. */
1472 function_to_pointer_conversion (tree exp
)
1474 tree orig_exp
= exp
;
1476 gcc_assert (TREE_CODE (TREE_TYPE (exp
)) == FUNCTION_TYPE
);
1478 STRIP_TYPE_NOPS (exp
);
1480 if (TREE_NO_WARNING (orig_exp
))
1481 TREE_NO_WARNING (exp
) = 1;
1483 return build_unary_op (ADDR_EXPR
, exp
, 0);
1486 /* Perform the default conversion of arrays and functions to pointers.
1487 Return the result of converting EXP. For any other expression, just
1488 return EXP after removing NOPs. */
1491 default_function_array_conversion (struct c_expr exp
)
1493 tree orig_exp
= exp
.value
;
1494 tree type
= TREE_TYPE (exp
.value
);
1495 enum tree_code code
= TREE_CODE (type
);
1501 bool not_lvalue
= false;
1502 bool lvalue_array_p
;
1504 while ((TREE_CODE (exp
.value
) == NON_LVALUE_EXPR
1505 || TREE_CODE (exp
.value
) == NOP_EXPR
1506 || TREE_CODE (exp
.value
) == CONVERT_EXPR
)
1507 && TREE_TYPE (TREE_OPERAND (exp
.value
, 0)) == type
)
1509 if (TREE_CODE (exp
.value
) == NON_LVALUE_EXPR
)
1511 exp
.value
= TREE_OPERAND (exp
.value
, 0);
1514 if (TREE_NO_WARNING (orig_exp
))
1515 TREE_NO_WARNING (exp
.value
) = 1;
1517 lvalue_array_p
= !not_lvalue
&& lvalue_p (exp
.value
);
1518 if (!flag_isoc99
&& !lvalue_array_p
)
1520 /* Before C99, non-lvalue arrays do not decay to pointers.
1521 Normally, using such an array would be invalid; but it can
1522 be used correctly inside sizeof or as a statement expression.
1523 Thus, do not give an error here; an error will result later. */
1527 exp
.value
= array_to_pointer_conversion (exp
.value
);
1531 exp
.value
= function_to_pointer_conversion (exp
.value
);
1534 STRIP_TYPE_NOPS (exp
.value
);
1535 if (TREE_NO_WARNING (orig_exp
))
1536 TREE_NO_WARNING (exp
.value
) = 1;
1544 /* EXP is an expression of integer type. Apply the integer promotions
1545 to it and return the promoted value. */
1548 perform_integral_promotions (tree exp
)
1550 tree type
= TREE_TYPE (exp
);
1551 enum tree_code code
= TREE_CODE (type
);
1553 gcc_assert (INTEGRAL_TYPE_P (type
));
1555 /* Normally convert enums to int,
1556 but convert wide enums to something wider. */
1557 if (code
== ENUMERAL_TYPE
)
1559 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
1560 TYPE_PRECISION (integer_type_node
)),
1561 ((TYPE_PRECISION (type
)
1562 >= TYPE_PRECISION (integer_type_node
))
1563 && TYPE_UNSIGNED (type
)));
1565 return convert (type
, exp
);
1568 /* ??? This should no longer be needed now bit-fields have their
1570 if (TREE_CODE (exp
) == COMPONENT_REF
1571 && DECL_C_BIT_FIELD (TREE_OPERAND (exp
, 1))
1572 /* If it's thinner than an int, promote it like a
1573 c_promoting_integer_type_p, otherwise leave it alone. */
1574 && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp
, 1)),
1575 TYPE_PRECISION (integer_type_node
)))
1576 return convert (integer_type_node
, exp
);
1578 if (c_promoting_integer_type_p (type
))
1580 /* Preserve unsignedness if not really getting any wider. */
1581 if (TYPE_UNSIGNED (type
)
1582 && TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
))
1583 return convert (unsigned_type_node
, exp
);
1585 return convert (integer_type_node
, exp
);
1592 /* Perform default promotions for C data used in expressions.
1593 Enumeral types or short or char are converted to int.
1594 In addition, manifest constants symbols are replaced by their values. */
1597 default_conversion (tree exp
)
1600 tree type
= TREE_TYPE (exp
);
1601 enum tree_code code
= TREE_CODE (type
);
1603 /* Functions and arrays have been converted during parsing. */
1604 gcc_assert (code
!= FUNCTION_TYPE
);
1605 if (code
== ARRAY_TYPE
)
1608 /* Constants can be used directly unless they're not loadable. */
1609 if (TREE_CODE (exp
) == CONST_DECL
)
1610 exp
= DECL_INITIAL (exp
);
1612 /* Replace a nonvolatile const static variable with its value unless
1613 it is an array, in which case we must be sure that taking the
1614 address of the array produces consistent results. */
1615 else if (optimize
&& TREE_CODE (exp
) == VAR_DECL
&& code
!= ARRAY_TYPE
)
1617 exp
= decl_constant_value_for_broken_optimization (exp
);
1618 type
= TREE_TYPE (exp
);
1621 /* Strip no-op conversions. */
1623 STRIP_TYPE_NOPS (exp
);
1625 if (TREE_NO_WARNING (orig_exp
))
1626 TREE_NO_WARNING (exp
) = 1;
1628 if (INTEGRAL_TYPE_P (type
))
1629 return perform_integral_promotions (exp
);
1631 if (code
== VOID_TYPE
)
1633 error ("void value not ignored as it ought to be");
1634 return error_mark_node
;
1639 /* Look up COMPONENT in a structure or union DECL.
1641 If the component name is not found, returns NULL_TREE. Otherwise,
1642 the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL
1643 stepping down the chain to the component, which is in the last
1644 TREE_VALUE of the list. Normally the list is of length one, but if
1645 the component is embedded within (nested) anonymous structures or
1646 unions, the list steps down the chain to the component. */
1649 lookup_field (tree decl
, tree component
)
1651 tree type
= TREE_TYPE (decl
);
1654 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1655 to the field elements. Use a binary search on this array to quickly
1656 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1657 will always be set for structures which have many elements. */
1659 if (TYPE_LANG_SPECIFIC (type
) && TYPE_LANG_SPECIFIC (type
)->s
)
1662 tree
*field_array
= &TYPE_LANG_SPECIFIC (type
)->s
->elts
[0];
1664 field
= TYPE_FIELDS (type
);
1666 top
= TYPE_LANG_SPECIFIC (type
)->s
->len
;
1667 while (top
- bot
> 1)
1669 half
= (top
- bot
+ 1) >> 1;
1670 field
= field_array
[bot
+half
];
1672 if (DECL_NAME (field
) == NULL_TREE
)
1674 /* Step through all anon unions in linear fashion. */
1675 while (DECL_NAME (field_array
[bot
]) == NULL_TREE
)
1677 field
= field_array
[bot
++];
1678 if (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
1679 || TREE_CODE (TREE_TYPE (field
)) == UNION_TYPE
)
1681 tree anon
= lookup_field (field
, component
);
1684 return tree_cons (NULL_TREE
, field
, anon
);
1688 /* Entire record is only anon unions. */
1692 /* Restart the binary search, with new lower bound. */
1696 if (DECL_NAME (field
) == component
)
1698 if (DECL_NAME (field
) < component
)
1704 if (DECL_NAME (field_array
[bot
]) == component
)
1705 field
= field_array
[bot
];
1706 else if (DECL_NAME (field
) != component
)
1711 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
1713 if (DECL_NAME (field
) == NULL_TREE
1714 && (TREE_CODE (TREE_TYPE (field
)) == RECORD_TYPE
1715 || TREE_CODE (TREE_TYPE (field
)) == UNION_TYPE
))
1717 tree anon
= lookup_field (field
, component
);
1720 return tree_cons (NULL_TREE
, field
, anon
);
1723 if (DECL_NAME (field
) == component
)
1727 if (field
== NULL_TREE
)
1731 return tree_cons (NULL_TREE
, field
, NULL_TREE
);
1734 /* Make an expression to refer to the COMPONENT field of
1735 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1738 build_component_ref (tree datum
, tree component
)
1740 tree type
= TREE_TYPE (datum
);
1741 enum tree_code code
= TREE_CODE (type
);
1745 if (!objc_is_public (datum
, component
))
1746 return error_mark_node
;
1748 /* See if there is a field or component with name COMPONENT. */
1750 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
)
1752 if (!COMPLETE_TYPE_P (type
))
1754 c_incomplete_type_error (NULL_TREE
, type
);
1755 return error_mark_node
;
1758 field
= lookup_field (datum
, component
);
1762 error ("%qT has no member named %qE", type
, component
);
1763 return error_mark_node
;
1766 /* Chain the COMPONENT_REFs if necessary down to the FIELD.
1767 This might be better solved in future the way the C++ front
1768 end does it - by giving the anonymous entities each a
1769 separate name and type, and then have build_component_ref
1770 recursively call itself. We can't do that here. */
1773 tree subdatum
= TREE_VALUE (field
);
1775 if (TREE_TYPE (subdatum
) == error_mark_node
)
1776 return error_mark_node
;
1778 ref
= build3 (COMPONENT_REF
, TREE_TYPE (subdatum
), datum
, subdatum
,
1780 if (TREE_READONLY (datum
) || TREE_READONLY (subdatum
))
1781 TREE_READONLY (ref
) = 1;
1782 if (TREE_THIS_VOLATILE (datum
) || TREE_THIS_VOLATILE (subdatum
))
1783 TREE_THIS_VOLATILE (ref
) = 1;
1785 if (TREE_DEPRECATED (subdatum
))
1786 warn_deprecated_use (subdatum
);
1790 field
= TREE_CHAIN (field
);
1796 else if (code
!= ERROR_MARK
)
1797 error ("request for member %qE in something not a structure or union",
1800 return error_mark_node
;
1803 /* Given an expression PTR for a pointer, return an expression
1804 for the value pointed to.
1805 ERRORSTRING is the name of the operator to appear in error messages. */
1808 build_indirect_ref (tree ptr
, const char *errorstring
)
1810 tree pointer
= default_conversion (ptr
);
1811 tree type
= TREE_TYPE (pointer
);
1813 if (TREE_CODE (type
) == POINTER_TYPE
)
1815 if (TREE_CODE (pointer
) == ADDR_EXPR
1816 && (TREE_TYPE (TREE_OPERAND (pointer
, 0))
1817 == TREE_TYPE (type
)))
1818 return TREE_OPERAND (pointer
, 0);
1821 tree t
= TREE_TYPE (type
);
1824 ref
= build1 (INDIRECT_REF
, t
, pointer
);
1826 if (!COMPLETE_OR_VOID_TYPE_P (t
) && TREE_CODE (t
) != ARRAY_TYPE
)
1828 error ("dereferencing pointer to incomplete type");
1829 return error_mark_node
;
1831 if (VOID_TYPE_P (t
) && skip_evaluation
== 0)
1832 warning (0, "dereferencing %<void *%> pointer");
1834 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
1835 so that we get the proper error message if the result is used
1836 to assign to. Also, &* is supposed to be a no-op.
1837 And ANSI C seems to specify that the type of the result
1838 should be the const type. */
1839 /* A de-reference of a pointer to const is not a const. It is valid
1840 to change it via some other pointer. */
1841 TREE_READONLY (ref
) = TYPE_READONLY (t
);
1842 TREE_SIDE_EFFECTS (ref
)
1843 = TYPE_VOLATILE (t
) || TREE_SIDE_EFFECTS (pointer
);
1844 TREE_THIS_VOLATILE (ref
) = TYPE_VOLATILE (t
);
1848 else if (TREE_CODE (pointer
) != ERROR_MARK
)
1849 error ("invalid type argument of %qs", errorstring
);
1850 return error_mark_node
;
1853 /* This handles expressions of the form "a[i]", which denotes
1856 This is logically equivalent in C to *(a+i), but we may do it differently.
1857 If A is a variable or a member, we generate a primitive ARRAY_REF.
1858 This avoids forcing the array out of registers, and can work on
1859 arrays that are not lvalues (for example, members of structures returned
1863 build_array_ref (tree array
, tree index
)
1865 bool swapped
= false;
1866 if (TREE_TYPE (array
) == error_mark_node
1867 || TREE_TYPE (index
) == error_mark_node
)
1868 return error_mark_node
;
1870 if (TREE_CODE (TREE_TYPE (array
)) != ARRAY_TYPE
1871 && TREE_CODE (TREE_TYPE (array
)) != POINTER_TYPE
)
1874 if (TREE_CODE (TREE_TYPE (index
)) != ARRAY_TYPE
1875 && TREE_CODE (TREE_TYPE (index
)) != POINTER_TYPE
)
1877 error ("subscripted value is neither array nor pointer");
1878 return error_mark_node
;
1886 if (!INTEGRAL_TYPE_P (TREE_TYPE (index
)))
1888 error ("array subscript is not an integer");
1889 return error_mark_node
;
1892 if (TREE_CODE (TREE_TYPE (TREE_TYPE (array
))) == FUNCTION_TYPE
)
1894 error ("subscripted value is pointer to function");
1895 return error_mark_node
;
1898 /* ??? Existing practice has been to warn only when the char
1899 index is syntactically the index, not for char[array]. */
1901 warn_array_subscript_with_type_char (index
);
1903 /* Apply default promotions *after* noticing character types. */
1904 index
= default_conversion (index
);
1906 gcc_assert (TREE_CODE (TREE_TYPE (index
)) == INTEGER_TYPE
);
1908 if (TREE_CODE (TREE_TYPE (array
)) == ARRAY_TYPE
)
1912 /* An array that is indexed by a non-constant
1913 cannot be stored in a register; we must be able to do
1914 address arithmetic on its address.
1915 Likewise an array of elements of variable size. */
1916 if (TREE_CODE (index
) != INTEGER_CST
1917 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array
)))
1918 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array
)))) != INTEGER_CST
))
1920 if (!c_mark_addressable (array
))
1921 return error_mark_node
;
1923 /* An array that is indexed by a constant value which is not within
1924 the array bounds cannot be stored in a register either; because we
1925 would get a crash in store_bit_field/extract_bit_field when trying
1926 to access a non-existent part of the register. */
1927 if (TREE_CODE (index
) == INTEGER_CST
1928 && TYPE_DOMAIN (TREE_TYPE (array
))
1929 && !int_fits_type_p (index
, TYPE_DOMAIN (TREE_TYPE (array
))))
1931 if (!c_mark_addressable (array
))
1932 return error_mark_node
;
1938 while (TREE_CODE (foo
) == COMPONENT_REF
)
1939 foo
= TREE_OPERAND (foo
, 0);
1940 if (TREE_CODE (foo
) == VAR_DECL
&& C_DECL_REGISTER (foo
))
1941 pedwarn ("ISO C forbids subscripting %<register%> array");
1942 else if (!flag_isoc99
&& !lvalue_p (foo
))
1943 pedwarn ("ISO C90 forbids subscripting non-lvalue array");
1946 type
= TREE_TYPE (TREE_TYPE (array
));
1947 if (TREE_CODE (type
) != ARRAY_TYPE
)
1948 type
= TYPE_MAIN_VARIANT (type
);
1949 rval
= build4 (ARRAY_REF
, type
, array
, index
, NULL_TREE
, NULL_TREE
);
1950 /* Array ref is const/volatile if the array elements are
1951 or if the array is. */
1952 TREE_READONLY (rval
)
1953 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array
)))
1954 | TREE_READONLY (array
));
1955 TREE_SIDE_EFFECTS (rval
)
1956 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array
)))
1957 | TREE_SIDE_EFFECTS (array
));
1958 TREE_THIS_VOLATILE (rval
)
1959 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array
)))
1960 /* This was added by rms on 16 Nov 91.
1961 It fixes vol struct foo *a; a->elts[1]
1962 in an inline function.
1963 Hope it doesn't break something else. */
1964 | TREE_THIS_VOLATILE (array
));
1965 return require_complete_type (fold (rval
));
1969 tree ar
= default_conversion (array
);
1971 if (ar
== error_mark_node
)
1974 gcc_assert (TREE_CODE (TREE_TYPE (ar
)) == POINTER_TYPE
);
1975 gcc_assert (TREE_CODE (TREE_TYPE (TREE_TYPE (ar
))) != FUNCTION_TYPE
);
1977 return build_indirect_ref (build_binary_op (PLUS_EXPR
, ar
, index
, 0),
1982 /* Build an external reference to identifier ID. FUN indicates
1983 whether this will be used for a function call. LOC is the source
1984 location of the identifier. */
1986 build_external_ref (tree id
, int fun
, location_t loc
)
1989 tree decl
= lookup_name (id
);
1991 /* In Objective-C, an instance variable (ivar) may be preferred to
1992 whatever lookup_name() found. */
1993 decl
= objc_lookup_ivar (decl
, id
);
1995 if (decl
&& decl
!= error_mark_node
)
1998 /* Implicit function declaration. */
1999 ref
= implicitly_declare (id
);
2000 else if (decl
== error_mark_node
)
2001 /* Don't complain about something that's already been
2002 complained about. */
2003 return error_mark_node
;
2006 undeclared_variable (id
, loc
);
2007 return error_mark_node
;
2010 if (TREE_TYPE (ref
) == error_mark_node
)
2011 return error_mark_node
;
2013 if (TREE_DEPRECATED (ref
))
2014 warn_deprecated_use (ref
);
2016 if (!skip_evaluation
)
2017 assemble_external (ref
);
2018 TREE_USED (ref
) = 1;
2020 if (TREE_CODE (ref
) == FUNCTION_DECL
&& !in_alignof
)
2022 if (!in_sizeof
&& !in_typeof
)
2023 C_DECL_USED (ref
) = 1;
2024 else if (DECL_INITIAL (ref
) == 0
2025 && DECL_EXTERNAL (ref
)
2026 && !TREE_PUBLIC (ref
))
2027 record_maybe_used_decl (ref
);
2030 if (TREE_CODE (ref
) == CONST_DECL
)
2032 ref
= DECL_INITIAL (ref
);
2033 TREE_CONSTANT (ref
) = 1;
2034 TREE_INVARIANT (ref
) = 1;
2036 else if (current_function_decl
!= 0
2037 && !DECL_FILE_SCOPE_P (current_function_decl
)
2038 && (TREE_CODE (ref
) == VAR_DECL
2039 || TREE_CODE (ref
) == PARM_DECL
2040 || TREE_CODE (ref
) == FUNCTION_DECL
))
2042 tree context
= decl_function_context (ref
);
2044 if (context
!= 0 && context
!= current_function_decl
)
2045 DECL_NONLOCAL (ref
) = 1;
2051 /* Record details of decls possibly used inside sizeof or typeof. */
2052 struct maybe_used_decl
2056 /* The level seen at (in_sizeof + in_typeof). */
2058 /* The next one at this level or above, or NULL. */
2059 struct maybe_used_decl
*next
;
2062 static struct maybe_used_decl
*maybe_used_decls
;
2064 /* Record that DECL, an undefined static function reference seen
2065 inside sizeof or typeof, might be used if the operand of sizeof is
2066 a VLA type or the operand of typeof is a variably modified
2070 record_maybe_used_decl (tree decl
)
2072 struct maybe_used_decl
*t
= XOBNEW (&parser_obstack
, struct maybe_used_decl
);
2074 t
->level
= in_sizeof
+ in_typeof
;
2075 t
->next
= maybe_used_decls
;
2076 maybe_used_decls
= t
;
2079 /* Pop the stack of decls possibly used inside sizeof or typeof. If
2080 USED is false, just discard them. If it is true, mark them used
2081 (if no longer inside sizeof or typeof) or move them to the next
2082 level up (if still inside sizeof or typeof). */
2085 pop_maybe_used (bool used
)
2087 struct maybe_used_decl
*p
= maybe_used_decls
;
2088 int cur_level
= in_sizeof
+ in_typeof
;
2089 while (p
&& p
->level
> cur_level
)
2094 C_DECL_USED (p
->decl
) = 1;
2096 p
->level
= cur_level
;
2100 if (!used
|| cur_level
== 0)
2101 maybe_used_decls
= p
;
2104 /* Return the result of sizeof applied to EXPR. */
2107 c_expr_sizeof_expr (struct c_expr expr
)
2110 if (expr
.value
== error_mark_node
)
2112 ret
.value
= error_mark_node
;
2113 ret
.original_code
= ERROR_MARK
;
2114 pop_maybe_used (false);
2118 ret
.value
= c_sizeof (TREE_TYPE (expr
.value
));
2119 ret
.original_code
= ERROR_MARK
;
2120 pop_maybe_used (C_TYPE_VARIABLE_SIZE (TREE_TYPE (expr
.value
)));
2125 /* Return the result of sizeof applied to T, a structure for the type
2126 name passed to sizeof (rather than the type itself). */
2129 c_expr_sizeof_type (struct c_type_name
*t
)
2133 type
= groktypename (t
);
2134 ret
.value
= c_sizeof (type
);
2135 ret
.original_code
= ERROR_MARK
;
2136 pop_maybe_used (C_TYPE_VARIABLE_SIZE (type
));
2140 /* Build a function call to function FUNCTION with parameters PARAMS.
2141 PARAMS is a list--a chain of TREE_LIST nodes--in which the
2142 TREE_VALUE of each node is a parameter-expression.
2143 FUNCTION's data type may be a function type or a pointer-to-function. */
2146 build_function_call (tree function
, tree params
)
2148 tree fntype
, fundecl
= 0;
2149 tree coerced_params
;
2150 tree name
= NULL_TREE
, result
;
2153 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
2154 STRIP_TYPE_NOPS (function
);
2156 /* Convert anything with function type to a pointer-to-function. */
2157 if (TREE_CODE (function
) == FUNCTION_DECL
)
2159 /* Implement type-directed function overloading for builtins.
2160 resolve_overloaded_builtin and targetm.resolve_overloaded_builtin
2161 handle all the type checking. The result is a complete expression
2162 that implements this function call. */
2163 tem
= resolve_overloaded_builtin (function
, params
);
2167 name
= DECL_NAME (function
);
2170 if (TREE_CODE (TREE_TYPE (function
)) == FUNCTION_TYPE
)
2171 function
= function_to_pointer_conversion (function
);
2173 /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF
2174 expressions, like those used for ObjC messenger dispatches. */
2175 function
= objc_rewrite_function_call (function
, params
);
2177 fntype
= TREE_TYPE (function
);
2179 if (TREE_CODE (fntype
) == ERROR_MARK
)
2180 return error_mark_node
;
2182 if (!(TREE_CODE (fntype
) == POINTER_TYPE
2183 && TREE_CODE (TREE_TYPE (fntype
)) == FUNCTION_TYPE
))
2185 error ("called object %qE is not a function", function
);
2186 return error_mark_node
;
2189 if (fundecl
&& TREE_THIS_VOLATILE (fundecl
))
2190 current_function_returns_abnormally
= 1;
2192 /* fntype now gets the type of function pointed to. */
2193 fntype
= TREE_TYPE (fntype
);
2195 /* Check that the function is called through a compatible prototype.
2196 If it is not, replace the call by a trap, wrapped up in a compound
2197 expression if necessary. This has the nice side-effect to prevent
2198 the tree-inliner from generating invalid assignment trees which may
2199 blow up in the RTL expander later. */
2200 if ((TREE_CODE (function
) == NOP_EXPR
2201 || TREE_CODE (function
) == CONVERT_EXPR
)
2202 && TREE_CODE (tem
= TREE_OPERAND (function
, 0)) == ADDR_EXPR
2203 && TREE_CODE (tem
= TREE_OPERAND (tem
, 0)) == FUNCTION_DECL
2204 && !comptypes (fntype
, TREE_TYPE (tem
)))
2206 tree return_type
= TREE_TYPE (fntype
);
2207 tree trap
= build_function_call (built_in_decls
[BUILT_IN_TRAP
],
2210 /* This situation leads to run-time undefined behavior. We can't,
2211 therefore, simply error unless we can prove that all possible
2212 executions of the program must execute the code. */
2213 warning (0, "function called through a non-compatible type");
2215 /* We can, however, treat "undefined" any way we please.
2216 Call abort to encourage the user to fix the program. */
2217 inform ("if this code is reached, the program will abort");
2219 if (VOID_TYPE_P (return_type
))
2225 if (AGGREGATE_TYPE_P (return_type
))
2226 rhs
= build_compound_literal (return_type
,
2227 build_constructor (return_type
, 0));
2229 rhs
= fold_convert (return_type
, integer_zero_node
);
2231 return build2 (COMPOUND_EXPR
, return_type
, trap
, rhs
);
2235 /* Convert the parameters to the types declared in the
2236 function prototype, or apply default promotions. */
2239 = convert_arguments (TYPE_ARG_TYPES (fntype
), params
, function
, fundecl
);
2241 if (coerced_params
== error_mark_node
)
2242 return error_mark_node
;
2244 /* Check that the arguments to the function are valid. */
2246 check_function_arguments (TYPE_ATTRIBUTES (fntype
), coerced_params
,
2247 TYPE_ARG_TYPES (fntype
));
2249 if (require_constant_value
)
2251 result
= fold_build3_initializer (CALL_EXPR
, TREE_TYPE (fntype
),
2252 function
, coerced_params
, NULL_TREE
);
2254 if (TREE_CONSTANT (result
)
2255 && (name
== NULL_TREE
2256 || strncmp (IDENTIFIER_POINTER (name
), "__builtin_", 10) != 0))
2257 pedwarn_init ("initializer element is not constant");
2260 result
= fold_build3 (CALL_EXPR
, TREE_TYPE (fntype
),
2261 function
, coerced_params
, NULL_TREE
);
2263 if (VOID_TYPE_P (TREE_TYPE (result
)))
2265 return require_complete_type (result
);
2268 /* Convert the argument expressions in the list VALUES
2269 to the types in the list TYPELIST. The result is a list of converted
2270 argument expressions, unless there are too few arguments in which
2271 case it is error_mark_node.
2273 If TYPELIST is exhausted, or when an element has NULL as its type,
2274 perform the default conversions.
2276 PARMLIST is the chain of parm decls for the function being called.
2277 It may be 0, if that info is not available.
2278 It is used only for generating error messages.
2280 FUNCTION is a tree for the called function. It is used only for
2281 error messages, where it is formatted with %qE.
2283 This is also where warnings about wrong number of args are generated.
2285 Both VALUES and the returned value are chains of TREE_LIST nodes
2286 with the elements of the list in the TREE_VALUE slots of those nodes. */
2289 convert_arguments (tree typelist
, tree values
, tree function
, tree fundecl
)
2291 tree typetail
, valtail
;
2296 /* Change pointer to function to the function itself for
2298 if (TREE_CODE (function
) == ADDR_EXPR
2299 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
)
2300 function
= TREE_OPERAND (function
, 0);
2302 /* Handle an ObjC selector specially for diagnostics. */
2303 selector
= objc_message_selector ();
2305 /* Scan the given expressions and types, producing individual
2306 converted arguments and pushing them on RESULT in reverse order. */
2308 for (valtail
= values
, typetail
= typelist
, parmnum
= 0;
2310 valtail
= TREE_CHAIN (valtail
), parmnum
++)
2312 tree type
= typetail
? TREE_VALUE (typetail
) : 0;
2313 tree val
= TREE_VALUE (valtail
);
2314 tree rname
= function
;
2315 int argnum
= parmnum
+ 1;
2316 const char *invalid_func_diag
;
2318 if (type
== void_type_node
)
2320 error ("too many arguments to function %qE", function
);
2324 if (selector
&& argnum
> 2)
2330 STRIP_TYPE_NOPS (val
);
2332 val
= require_complete_type (val
);
2336 /* Formal parm type is specified by a function prototype. */
2339 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
2341 error ("type of formal parameter %d is incomplete", parmnum
+ 1);
2346 /* Optionally warn about conversions that
2347 differ from the default conversions. */
2348 if (warn_conversion
|| warn_traditional
)
2350 unsigned int formal_prec
= TYPE_PRECISION (type
);
2352 if (INTEGRAL_TYPE_P (type
)
2353 && TREE_CODE (TREE_TYPE (val
)) == REAL_TYPE
)
2354 warning (0, "passing argument %d of %qE as integer "
2355 "rather than floating due to prototype",
2357 if (INTEGRAL_TYPE_P (type
)
2358 && TREE_CODE (TREE_TYPE (val
)) == COMPLEX_TYPE
)
2359 warning (0, "passing argument %d of %qE as integer "
2360 "rather than complex due to prototype",
2362 else if (TREE_CODE (type
) == COMPLEX_TYPE
2363 && TREE_CODE (TREE_TYPE (val
)) == REAL_TYPE
)
2364 warning (0, "passing argument %d of %qE as complex "
2365 "rather than floating due to prototype",
2367 else if (TREE_CODE (type
) == REAL_TYPE
2368 && INTEGRAL_TYPE_P (TREE_TYPE (val
)))
2369 warning (0, "passing argument %d of %qE as floating "
2370 "rather than integer due to prototype",
2372 else if (TREE_CODE (type
) == COMPLEX_TYPE
2373 && INTEGRAL_TYPE_P (TREE_TYPE (val
)))
2374 warning (0, "passing argument %d of %qE as complex "
2375 "rather than integer due to prototype",
2377 else if (TREE_CODE (type
) == REAL_TYPE
2378 && TREE_CODE (TREE_TYPE (val
)) == COMPLEX_TYPE
)
2379 warning (0, "passing argument %d of %qE as floating "
2380 "rather than complex due to prototype",
2382 /* ??? At some point, messages should be written about
2383 conversions between complex types, but that's too messy
2385 else if (TREE_CODE (type
) == REAL_TYPE
2386 && TREE_CODE (TREE_TYPE (val
)) == REAL_TYPE
)
2388 /* Warn if any argument is passed as `float',
2389 since without a prototype it would be `double'. */
2390 if (formal_prec
== TYPE_PRECISION (float_type_node
)
2391 && type
!= dfloat32_type_node
)
2392 warning (0, "passing argument %d of %qE as %<float%> "
2393 "rather than %<double%> due to prototype",
2396 /* Warn if mismatch between argument and prototype
2397 for decimal float types. Warn of conversions with
2398 binary float types and of precision narrowing due to
2400 else if (type
!= TREE_TYPE (val
)
2401 && (type
== dfloat32_type_node
2402 || type
== dfloat64_type_node
2403 || type
== dfloat128_type_node
2404 || TREE_TYPE (val
) == dfloat32_type_node
2405 || TREE_TYPE (val
) == dfloat64_type_node
2406 || TREE_TYPE (val
) == dfloat128_type_node
)
2408 <= TYPE_PRECISION (TREE_TYPE (val
))
2409 || (type
== dfloat128_type_node
2411 != dfloat64_type_node
2413 != dfloat32_type_node
)))
2414 || (type
== dfloat64_type_node
2416 != dfloat32_type_node
))))
2417 warning (0, "passing argument %d of %qE as %qT "
2418 "rather than %qT due to prototype",
2419 argnum
, rname
, type
, TREE_TYPE (val
));
2422 /* Detect integer changing in width or signedness.
2423 These warnings are only activated with
2424 -Wconversion, not with -Wtraditional. */
2425 else if (warn_conversion
&& INTEGRAL_TYPE_P (type
)
2426 && INTEGRAL_TYPE_P (TREE_TYPE (val
)))
2428 tree would_have_been
= default_conversion (val
);
2429 tree type1
= TREE_TYPE (would_have_been
);
2431 if (TREE_CODE (type
) == ENUMERAL_TYPE
2432 && (TYPE_MAIN_VARIANT (type
)
2433 == TYPE_MAIN_VARIANT (TREE_TYPE (val
))))
2434 /* No warning if function asks for enum
2435 and the actual arg is that enum type. */
2437 else if (formal_prec
!= TYPE_PRECISION (type1
))
2438 warning (OPT_Wconversion
, "passing argument %d of %qE "
2439 "with different width due to prototype",
2441 else if (TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (type1
))
2443 /* Don't complain if the formal parameter type
2444 is an enum, because we can't tell now whether
2445 the value was an enum--even the same enum. */
2446 else if (TREE_CODE (type
) == ENUMERAL_TYPE
)
2448 else if (TREE_CODE (val
) == INTEGER_CST
2449 && int_fits_type_p (val
, type
))
2450 /* Change in signedness doesn't matter
2451 if a constant value is unaffected. */
2453 /* If the value is extended from a narrower
2454 unsigned type, it doesn't matter whether we
2455 pass it as signed or unsigned; the value
2456 certainly is the same either way. */
2457 else if (TYPE_PRECISION (TREE_TYPE (val
)) < TYPE_PRECISION (type
)
2458 && TYPE_UNSIGNED (TREE_TYPE (val
)))
2460 else if (TYPE_UNSIGNED (type
))
2461 warning (OPT_Wconversion
, "passing argument %d of %qE "
2462 "as unsigned due to prototype",
2465 warning (OPT_Wconversion
, "passing argument %d of %qE "
2466 "as signed due to prototype", argnum
, rname
);
2470 parmval
= convert_for_assignment (type
, val
, ic_argpass
,
2474 if (targetm
.calls
.promote_prototypes (fundecl
? TREE_TYPE (fundecl
) : 0)
2475 && INTEGRAL_TYPE_P (type
)
2476 && (TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
)))
2477 parmval
= default_conversion (parmval
);
2479 result
= tree_cons (NULL_TREE
, parmval
, result
);
2481 else if (TREE_CODE (TREE_TYPE (val
)) == REAL_TYPE
2482 && (TYPE_PRECISION (TREE_TYPE (val
))
2483 < TYPE_PRECISION (double_type_node
))
2484 && !DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (val
))))
2485 /* Convert `float' to `double'. */
2486 result
= tree_cons (NULL_TREE
, convert (double_type_node
, val
), result
);
2487 else if ((invalid_func_diag
=
2488 targetm
.calls
.invalid_arg_for_unprototyped_fn (typelist
, fundecl
, val
)))
2490 error (invalid_func_diag
);
2491 return error_mark_node
;
2494 /* Convert `short' and `char' to full-size `int'. */
2495 result
= tree_cons (NULL_TREE
, default_conversion (val
), result
);
2498 typetail
= TREE_CHAIN (typetail
);
2501 if (typetail
!= 0 && TREE_VALUE (typetail
) != void_type_node
)
2503 error ("too few arguments to function %qE", function
);
2504 return error_mark_node
;
2507 return nreverse (result
);
2510 /* This is the entry point used by the parser to build unary operators
2511 in the input. CODE, a tree_code, specifies the unary operator, and
2512 ARG is the operand. For unary plus, the C parser currently uses
2513 CONVERT_EXPR for code. */
2516 parser_build_unary_op (enum tree_code code
, struct c_expr arg
)
2518 struct c_expr result
;
2520 result
.original_code
= ERROR_MARK
;
2521 result
.value
= build_unary_op (code
, arg
.value
, 0);
2522 overflow_warning (result
.value
);
2526 /* This is the entry point used by the parser to build binary operators
2527 in the input. CODE, a tree_code, specifies the binary operator, and
2528 ARG1 and ARG2 are the operands. In addition to constructing the
2529 expression, we check for operands that were written with other binary
2530 operators in a way that is likely to confuse the user. */
2533 parser_build_binary_op (enum tree_code code
, struct c_expr arg1
,
2536 struct c_expr result
;
2538 enum tree_code code1
= arg1
.original_code
;
2539 enum tree_code code2
= arg2
.original_code
;
2541 result
.value
= build_binary_op (code
, arg1
.value
, arg2
.value
, 1);
2542 result
.original_code
= code
;
2544 if (TREE_CODE (result
.value
) == ERROR_MARK
)
2547 /* Check for cases such as x+y<<z which users are likely
2549 if (warn_parentheses
)
2551 if (code
== LSHIFT_EXPR
|| code
== RSHIFT_EXPR
)
2553 if (code1
== PLUS_EXPR
|| code1
== MINUS_EXPR
2554 || code2
== PLUS_EXPR
|| code2
== MINUS_EXPR
)
2555 warning (OPT_Wparentheses
,
2556 "suggest parentheses around + or - inside shift");
2559 if (code
== TRUTH_ORIF_EXPR
)
2561 if (code1
== TRUTH_ANDIF_EXPR
2562 || code2
== TRUTH_ANDIF_EXPR
)
2563 warning (OPT_Wparentheses
,
2564 "suggest parentheses around && within ||");
2567 if (code
== BIT_IOR_EXPR
)
2569 if (code1
== BIT_AND_EXPR
|| code1
== BIT_XOR_EXPR
2570 || code1
== PLUS_EXPR
|| code1
== MINUS_EXPR
2571 || code2
== BIT_AND_EXPR
|| code2
== BIT_XOR_EXPR
2572 || code2
== PLUS_EXPR
|| code2
== MINUS_EXPR
)
2573 warning (OPT_Wparentheses
,
2574 "suggest parentheses around arithmetic in operand of |");
2575 /* Check cases like x|y==z */
2576 if (TREE_CODE_CLASS (code1
) == tcc_comparison
2577 || TREE_CODE_CLASS (code2
) == tcc_comparison
)
2578 warning (OPT_Wparentheses
,
2579 "suggest parentheses around comparison in operand of |");
2582 if (code
== BIT_XOR_EXPR
)
2584 if (code1
== BIT_AND_EXPR
2585 || code1
== PLUS_EXPR
|| code1
== MINUS_EXPR
2586 || code2
== BIT_AND_EXPR
2587 || code2
== PLUS_EXPR
|| code2
== MINUS_EXPR
)
2588 warning (OPT_Wparentheses
,
2589 "suggest parentheses around arithmetic in operand of ^");
2590 /* Check cases like x^y==z */
2591 if (TREE_CODE_CLASS (code1
) == tcc_comparison
2592 || TREE_CODE_CLASS (code2
) == tcc_comparison
)
2593 warning (OPT_Wparentheses
,
2594 "suggest parentheses around comparison in operand of ^");
2597 if (code
== BIT_AND_EXPR
)
2599 if (code1
== PLUS_EXPR
|| code1
== MINUS_EXPR
2600 || code2
== PLUS_EXPR
|| code2
== MINUS_EXPR
)
2601 warning (OPT_Wparentheses
,
2602 "suggest parentheses around + or - in operand of &");
2603 /* Check cases like x&y==z */
2604 if (TREE_CODE_CLASS (code1
) == tcc_comparison
2605 || TREE_CODE_CLASS (code2
) == tcc_comparison
)
2606 warning (OPT_Wparentheses
,
2607 "suggest parentheses around comparison in operand of &");
2609 /* Similarly, check for cases like 1<=i<=10 that are probably errors. */
2610 if (TREE_CODE_CLASS (code
) == tcc_comparison
2611 && (TREE_CODE_CLASS (code1
) == tcc_comparison
2612 || TREE_CODE_CLASS (code2
) == tcc_comparison
))
2613 warning (OPT_Wparentheses
, "comparisons like X<=Y<=Z do not "
2614 "have their mathematical meaning");
2618 /* Warn about comparisons against string literals, with the exception
2619 of testing for equality or inequality of a string literal with NULL. */
2620 if (code
== EQ_EXPR
|| code
== NE_EXPR
)
2622 if ((code1
== STRING_CST
&& !integer_zerop (arg2
.value
))
2623 || (code2
== STRING_CST
&& !integer_zerop (arg1
.value
)))
2624 warning (OPT_Wstring_literal_comparison
,
2625 "comparison with string literal");
2627 else if (TREE_CODE_CLASS (code
) == tcc_comparison
2628 && (code1
== STRING_CST
|| code2
== STRING_CST
))
2629 warning (OPT_Wstring_literal_comparison
,
2630 "comparison with string literal");
2632 unsigned_conversion_warning (result
.value
, arg1
.value
);
2633 unsigned_conversion_warning (result
.value
, arg2
.value
);
2634 overflow_warning (result
.value
);
2639 /* Return a tree for the difference of pointers OP0 and OP1.
2640 The resulting tree has type int. */
2643 pointer_diff (tree op0
, tree op1
)
2645 tree restype
= ptrdiff_type_node
;
2647 tree target_type
= TREE_TYPE (TREE_TYPE (op0
));
2648 tree con0
, con1
, lit0
, lit1
;
2649 tree orig_op1
= op1
;
2651 if (pedantic
|| warn_pointer_arith
)
2653 if (TREE_CODE (target_type
) == VOID_TYPE
)
2654 pedwarn ("pointer of type %<void *%> used in subtraction");
2655 if (TREE_CODE (target_type
) == FUNCTION_TYPE
)
2656 pedwarn ("pointer to a function used in subtraction");
2659 /* If the conversion to ptrdiff_type does anything like widening or
2660 converting a partial to an integral mode, we get a convert_expression
2661 that is in the way to do any simplifications.
2662 (fold-const.c doesn't know that the extra bits won't be needed.
2663 split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a
2664 different mode in place.)
2665 So first try to find a common term here 'by hand'; we want to cover
2666 at least the cases that occur in legal static initializers. */
2667 if ((TREE_CODE (op0
) == NOP_EXPR
|| TREE_CODE (op0
) == CONVERT_EXPR
)
2668 && (TYPE_PRECISION (TREE_TYPE (op0
))
2669 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0
, 0)))))
2670 con0
= TREE_OPERAND (op0
, 0);
2673 if ((TREE_CODE (op1
) == NOP_EXPR
|| TREE_CODE (op1
) == CONVERT_EXPR
)
2674 && (TYPE_PRECISION (TREE_TYPE (op1
))
2675 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1
, 0)))))
2676 con1
= TREE_OPERAND (op1
, 0);
2680 if (TREE_CODE (con0
) == PLUS_EXPR
)
2682 lit0
= TREE_OPERAND (con0
, 1);
2683 con0
= TREE_OPERAND (con0
, 0);
2686 lit0
= integer_zero_node
;
2688 if (TREE_CODE (con1
) == PLUS_EXPR
)
2690 lit1
= TREE_OPERAND (con1
, 1);
2691 con1
= TREE_OPERAND (con1
, 0);
2694 lit1
= integer_zero_node
;
2696 if (operand_equal_p (con0
, con1
, 0))
2703 /* First do the subtraction as integers;
2704 then drop through to build the divide operator.
2705 Do not do default conversions on the minus operator
2706 in case restype is a short type. */
2708 op0
= build_binary_op (MINUS_EXPR
, convert (restype
, op0
),
2709 convert (restype
, op1
), 0);
2710 /* This generates an error if op1 is pointer to incomplete type. */
2711 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1
))))
2712 error ("arithmetic on pointer to an incomplete type");
2714 /* This generates an error if op0 is pointer to incomplete type. */
2715 op1
= c_size_in_bytes (target_type
);
2717 /* Divide by the size, in easiest possible way. */
2718 return fold_build2 (EXACT_DIV_EXPR
, restype
, op0
, convert (restype
, op1
));
2721 /* Construct and perhaps optimize a tree representation
2722 for a unary operation. CODE, a tree_code, specifies the operation
2723 and XARG is the operand.
2724 For any CODE other than ADDR_EXPR, FLAG nonzero suppresses
2725 the default promotions (such as from short to int).
2726 For ADDR_EXPR, the default promotions are not applied; FLAG nonzero
2727 allows non-lvalues; this is only used to handle conversion of non-lvalue
2728 arrays to pointers in C99. */
2731 build_unary_op (enum tree_code code
, tree xarg
, int flag
)
2733 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
2736 enum tree_code typecode
= TREE_CODE (TREE_TYPE (arg
));
2738 int noconvert
= flag
;
2739 const char *invalid_op_diag
;
2741 if (typecode
== ERROR_MARK
)
2742 return error_mark_node
;
2743 if (typecode
== ENUMERAL_TYPE
|| typecode
== BOOLEAN_TYPE
)
2744 typecode
= INTEGER_TYPE
;
2746 if ((invalid_op_diag
2747 = targetm
.invalid_unary_op (code
, TREE_TYPE (xarg
))))
2749 error (invalid_op_diag
);
2750 return error_mark_node
;
2756 /* This is used for unary plus, because a CONVERT_EXPR
2757 is enough to prevent anybody from looking inside for
2758 associativity, but won't generate any code. */
2759 if (!(typecode
== INTEGER_TYPE
|| typecode
== REAL_TYPE
2760 || typecode
== COMPLEX_TYPE
2761 || typecode
== VECTOR_TYPE
))
2763 error ("wrong type argument to unary plus");
2764 return error_mark_node
;
2766 else if (!noconvert
)
2767 arg
= default_conversion (arg
);
2768 arg
= non_lvalue (arg
);
2772 if (!(typecode
== INTEGER_TYPE
|| typecode
== REAL_TYPE
2773 || typecode
== COMPLEX_TYPE
2774 || typecode
== VECTOR_TYPE
))
2776 error ("wrong type argument to unary minus");
2777 return error_mark_node
;
2779 else if (!noconvert
)
2780 arg
= default_conversion (arg
);
2784 if (typecode
== INTEGER_TYPE
|| typecode
== VECTOR_TYPE
)
2787 arg
= default_conversion (arg
);
2789 else if (typecode
== COMPLEX_TYPE
)
2793 pedwarn ("ISO C does not support %<~%> for complex conjugation");
2795 arg
= default_conversion (arg
);
2799 error ("wrong type argument to bit-complement");
2800 return error_mark_node
;
2805 if (!(typecode
== INTEGER_TYPE
|| typecode
== REAL_TYPE
))
2807 error ("wrong type argument to abs");
2808 return error_mark_node
;
2810 else if (!noconvert
)
2811 arg
= default_conversion (arg
);
2815 /* Conjugating a real value is a no-op, but allow it anyway. */
2816 if (!(typecode
== INTEGER_TYPE
|| typecode
== REAL_TYPE
2817 || typecode
== COMPLEX_TYPE
))
2819 error ("wrong type argument to conjugation");
2820 return error_mark_node
;
2822 else if (!noconvert
)
2823 arg
= default_conversion (arg
);
2826 case TRUTH_NOT_EXPR
:
2827 if (typecode
!= INTEGER_TYPE
2828 && typecode
!= REAL_TYPE
&& typecode
!= POINTER_TYPE
2829 && typecode
!= COMPLEX_TYPE
)
2831 error ("wrong type argument to unary exclamation mark");
2832 return error_mark_node
;
2834 arg
= c_objc_common_truthvalue_conversion (arg
);
2835 return invert_truthvalue (arg
);
2838 if (TREE_CODE (arg
) == COMPLEX_CST
)
2839 return TREE_REALPART (arg
);
2840 else if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
2841 return fold_build1 (REALPART_EXPR
, TREE_TYPE (TREE_TYPE (arg
)), arg
);
2846 if (TREE_CODE (arg
) == COMPLEX_CST
)
2847 return TREE_IMAGPART (arg
);
2848 else if (TREE_CODE (TREE_TYPE (arg
)) == COMPLEX_TYPE
)
2849 return fold_build1 (IMAGPART_EXPR
, TREE_TYPE (TREE_TYPE (arg
)), arg
);
2851 return convert (TREE_TYPE (arg
), integer_zero_node
);
2853 case PREINCREMENT_EXPR
:
2854 case POSTINCREMENT_EXPR
:
2855 case PREDECREMENT_EXPR
:
2856 case POSTDECREMENT_EXPR
:
2858 /* Increment or decrement the real part of the value,
2859 and don't change the imaginary part. */
2860 if (typecode
== COMPLEX_TYPE
)
2865 pedwarn ("ISO C does not support %<++%> and %<--%>"
2866 " on complex types");
2868 arg
= stabilize_reference (arg
);
2869 real
= build_unary_op (REALPART_EXPR
, arg
, 1);
2870 imag
= build_unary_op (IMAGPART_EXPR
, arg
, 1);
2871 return build2 (COMPLEX_EXPR
, TREE_TYPE (arg
),
2872 build_unary_op (code
, real
, 1), imag
);
2875 /* Report invalid types. */
2877 if (typecode
!= POINTER_TYPE
2878 && typecode
!= INTEGER_TYPE
&& typecode
!= REAL_TYPE
)
2880 if (code
== PREINCREMENT_EXPR
|| code
== POSTINCREMENT_EXPR
)
2881 error ("wrong type argument to increment");
2883 error ("wrong type argument to decrement");
2885 return error_mark_node
;
2890 tree result_type
= TREE_TYPE (arg
);
2892 arg
= get_unwidened (arg
, 0);
2893 argtype
= TREE_TYPE (arg
);
2895 /* Compute the increment. */
2897 if (typecode
== POINTER_TYPE
)
2899 /* If pointer target is an undefined struct,
2900 we just cannot know how to do the arithmetic. */
2901 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type
)))
2903 if (code
== PREINCREMENT_EXPR
|| code
== POSTINCREMENT_EXPR
)
2904 error ("increment of pointer to unknown structure");
2906 error ("decrement of pointer to unknown structure");
2908 else if ((pedantic
|| warn_pointer_arith
)
2909 && (TREE_CODE (TREE_TYPE (result_type
)) == FUNCTION_TYPE
2910 || TREE_CODE (TREE_TYPE (result_type
)) == VOID_TYPE
))
2912 if (code
== PREINCREMENT_EXPR
|| code
== POSTINCREMENT_EXPR
)
2913 pedwarn ("wrong type argument to increment");
2915 pedwarn ("wrong type argument to decrement");
2918 inc
= c_size_in_bytes (TREE_TYPE (result_type
));
2921 inc
= integer_one_node
;
2923 inc
= convert (argtype
, inc
);
2925 /* Complain about anything else that is not a true lvalue. */
2926 if (!lvalue_or_else (arg
, ((code
== PREINCREMENT_EXPR
2927 || code
== POSTINCREMENT_EXPR
)
2930 return error_mark_node
;
2932 /* Report a read-only lvalue. */
2933 if (TREE_READONLY (arg
))
2935 readonly_error (arg
,
2936 ((code
== PREINCREMENT_EXPR
2937 || code
== POSTINCREMENT_EXPR
)
2938 ? lv_increment
: lv_decrement
));
2939 return error_mark_node
;
2942 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
)
2943 val
= boolean_increment (code
, arg
);
2945 val
= build2 (code
, TREE_TYPE (arg
), arg
, inc
);
2946 TREE_SIDE_EFFECTS (val
) = 1;
2947 val
= convert (result_type
, val
);
2948 if (TREE_CODE (val
) != code
)
2949 TREE_NO_WARNING (val
) = 1;
2954 /* Note that this operation never does default_conversion. */
2956 /* Let &* cancel out to simplify resulting code. */
2957 if (TREE_CODE (arg
) == INDIRECT_REF
)
2959 /* Don't let this be an lvalue. */
2960 if (lvalue_p (TREE_OPERAND (arg
, 0)))
2961 return non_lvalue (TREE_OPERAND (arg
, 0));
2962 return TREE_OPERAND (arg
, 0);
2965 /* For &x[y], return x+y */
2966 if (TREE_CODE (arg
) == ARRAY_REF
)
2968 tree op0
= TREE_OPERAND (arg
, 0);
2969 if (!c_mark_addressable (op0
))
2970 return error_mark_node
;
2971 return build_binary_op (PLUS_EXPR
,
2972 (TREE_CODE (TREE_TYPE (op0
)) == ARRAY_TYPE
2973 ? array_to_pointer_conversion (op0
)
2975 TREE_OPERAND (arg
, 1), 1);
2978 /* Anything not already handled and not a true memory reference
2979 or a non-lvalue array is an error. */
2980 else if (typecode
!= FUNCTION_TYPE
&& !flag
2981 && !lvalue_or_else (arg
, lv_addressof
))
2982 return error_mark_node
;
2984 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
2985 argtype
= TREE_TYPE (arg
);
2987 /* If the lvalue is const or volatile, merge that into the type
2988 to which the address will point. Note that you can't get a
2989 restricted pointer by taking the address of something, so we
2990 only have to deal with `const' and `volatile' here. */
2991 if ((DECL_P (arg
) || REFERENCE_CLASS_P (arg
))
2992 && (TREE_READONLY (arg
) || TREE_THIS_VOLATILE (arg
)))
2993 argtype
= c_build_type_variant (argtype
,
2994 TREE_READONLY (arg
),
2995 TREE_THIS_VOLATILE (arg
));
2997 if (!c_mark_addressable (arg
))
2998 return error_mark_node
;
3000 gcc_assert (TREE_CODE (arg
) != COMPONENT_REF
3001 || !DECL_C_BIT_FIELD (TREE_OPERAND (arg
, 1)));
3003 argtype
= build_pointer_type (argtype
);
3005 /* ??? Cope with user tricks that amount to offsetof. Delete this
3006 when we have proper support for integer constant expressions. */
3007 val
= get_base_address (arg
);
3008 if (val
&& TREE_CODE (val
) == INDIRECT_REF
3009 && TREE_CONSTANT (TREE_OPERAND (val
, 0)))
3011 tree op0
= fold_convert (argtype
, fold_offsetof (arg
)), op1
;
3013 op1
= fold_convert (argtype
, TREE_OPERAND (val
, 0));
3014 return fold_build2 (PLUS_EXPR
, argtype
, op0
, op1
);
3017 val
= build1 (ADDR_EXPR
, argtype
, arg
);
3026 argtype
= TREE_TYPE (arg
);
3027 return require_constant_value
? fold_build1_initializer (code
, argtype
, arg
)
3028 : fold_build1 (code
, argtype
, arg
);
3031 /* Return nonzero if REF is an lvalue valid for this language.
3032 Lvalues can be assigned, unless their type has TYPE_READONLY.
3033 Lvalues can have their address taken, unless they have C_DECL_REGISTER. */
3038 enum tree_code code
= TREE_CODE (ref
);
3045 return lvalue_p (TREE_OPERAND (ref
, 0));
3047 case COMPOUND_LITERAL_EXPR
:
3057 return (TREE_CODE (TREE_TYPE (ref
)) != FUNCTION_TYPE
3058 && TREE_CODE (TREE_TYPE (ref
)) != METHOD_TYPE
);
3061 return TREE_CODE (TREE_TYPE (ref
)) == ARRAY_TYPE
;
3068 /* Give an error for storing in something that is 'const'. */
3071 readonly_error (tree arg
, enum lvalue_use use
)
3073 gcc_assert (use
== lv_assign
|| use
== lv_increment
|| use
== lv_decrement
3075 /* Using this macro rather than (for example) arrays of messages
3076 ensures that all the format strings are checked at compile
3078 #define READONLY_MSG(A, I, D, AS) (use == lv_assign ? (A) \
3079 : (use == lv_increment ? (I) \
3080 : (use == lv_decrement ? (D) : (AS))))
3081 if (TREE_CODE (arg
) == COMPONENT_REF
)
3083 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg
, 0))))
3084 readonly_error (TREE_OPERAND (arg
, 0), use
);
3086 error (READONLY_MSG (G_("assignment of read-only member %qD"),
3087 G_("increment of read-only member %qD"),
3088 G_("decrement of read-only member %qD"),
3089 G_("read-only member %qD used as %<asm%> output")),
3090 TREE_OPERAND (arg
, 1));
3092 else if (TREE_CODE (arg
) == VAR_DECL
)
3093 error (READONLY_MSG (G_("assignment of read-only variable %qD"),
3094 G_("increment of read-only variable %qD"),
3095 G_("decrement of read-only variable %qD"),
3096 G_("read-only variable %qD used as %<asm%> output")),
3099 error (READONLY_MSG (G_("assignment of read-only location"),
3100 G_("increment of read-only location"),
3101 G_("decrement of read-only location"),
3102 G_("read-only location used as %<asm%> output")));
3106 /* Return nonzero if REF is an lvalue valid for this language;
3107 otherwise, print an error message and return zero. USE says
3108 how the lvalue is being used and so selects the error message. */
3111 lvalue_or_else (tree ref
, enum lvalue_use use
)
3113 int win
= lvalue_p (ref
);
3121 /* Mark EXP saying that we need to be able to take the
3122 address of it; it should not be allocated in a register.
3123 Returns true if successful. */
3126 c_mark_addressable (tree exp
)
3131 switch (TREE_CODE (x
))
3134 if (DECL_C_BIT_FIELD (TREE_OPERAND (x
, 1)))
3137 ("cannot take address of bit-field %qD", TREE_OPERAND (x
, 1));
3141 /* ... fall through ... */
3147 x
= TREE_OPERAND (x
, 0);
3150 case COMPOUND_LITERAL_EXPR
:
3152 TREE_ADDRESSABLE (x
) = 1;
3159 if (C_DECL_REGISTER (x
)
3160 && DECL_NONLOCAL (x
))
3162 if (TREE_PUBLIC (x
) || TREE_STATIC (x
) || DECL_EXTERNAL (x
))
3165 ("global register variable %qD used in nested function", x
);
3168 pedwarn ("register variable %qD used in nested function", x
);
3170 else if (C_DECL_REGISTER (x
))
3172 if (TREE_PUBLIC (x
) || TREE_STATIC (x
) || DECL_EXTERNAL (x
))
3173 error ("address of global register variable %qD requested", x
);
3175 error ("address of register variable %qD requested", x
);
3181 TREE_ADDRESSABLE (x
) = 1;
3188 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
3191 build_conditional_expr (tree ifexp
, tree op1
, tree op2
)
3195 enum tree_code code1
;
3196 enum tree_code code2
;
3197 tree result_type
= NULL
;
3198 tree orig_op1
= op1
, orig_op2
= op2
;
3200 /* Promote both alternatives. */
3202 if (TREE_CODE (TREE_TYPE (op1
)) != VOID_TYPE
)
3203 op1
= default_conversion (op1
);
3204 if (TREE_CODE (TREE_TYPE (op2
)) != VOID_TYPE
)
3205 op2
= default_conversion (op2
);
3207 if (TREE_CODE (ifexp
) == ERROR_MARK
3208 || TREE_CODE (TREE_TYPE (op1
)) == ERROR_MARK
3209 || TREE_CODE (TREE_TYPE (op2
)) == ERROR_MARK
)
3210 return error_mark_node
;
3212 type1
= TREE_TYPE (op1
);
3213 code1
= TREE_CODE (type1
);
3214 type2
= TREE_TYPE (op2
);
3215 code2
= TREE_CODE (type2
);
3217 /* C90 does not permit non-lvalue arrays in conditional expressions.
3218 In C99 they will be pointers by now. */
3219 if (code1
== ARRAY_TYPE
|| code2
== ARRAY_TYPE
)
3221 error ("non-lvalue array in conditional expression");
3222 return error_mark_node
;
3225 /* Quickly detect the usual case where op1 and op2 have the same type
3227 if (TYPE_MAIN_VARIANT (type1
) == TYPE_MAIN_VARIANT (type2
))
3230 result_type
= type1
;
3232 result_type
= TYPE_MAIN_VARIANT (type1
);
3234 else if ((code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
3235 || code1
== COMPLEX_TYPE
)
3236 && (code2
== INTEGER_TYPE
|| code2
== REAL_TYPE
3237 || code2
== COMPLEX_TYPE
))
3239 result_type
= c_common_type (type1
, type2
);
3241 /* If -Wsign-compare, warn here if type1 and type2 have
3242 different signedness. We'll promote the signed to unsigned
3243 and later code won't know it used to be different.
3244 Do this check on the original types, so that explicit casts
3245 will be considered, but default promotions won't. */
3246 if (warn_sign_compare
&& !skip_evaluation
)
3248 int unsigned_op1
= TYPE_UNSIGNED (TREE_TYPE (orig_op1
));
3249 int unsigned_op2
= TYPE_UNSIGNED (TREE_TYPE (orig_op2
));
3251 if (unsigned_op1
^ unsigned_op2
)
3253 /* Do not warn if the result type is signed, since the
3254 signed type will only be chosen if it can represent
3255 all the values of the unsigned type. */
3256 if (!TYPE_UNSIGNED (result_type
))
3258 /* Do not warn if the signed quantity is an unsuffixed
3259 integer literal (or some static constant expression
3260 involving such literals) and it is non-negative. */
3261 else if ((unsigned_op2
&& tree_expr_nonnegative_p (op1
))
3262 || (unsigned_op1
&& tree_expr_nonnegative_p (op2
)))
3265 warning (0, "signed and unsigned type in conditional expression");
3269 else if (code1
== VOID_TYPE
|| code2
== VOID_TYPE
)
3271 if (pedantic
&& (code1
!= VOID_TYPE
|| code2
!= VOID_TYPE
))
3272 pedwarn ("ISO C forbids conditional expr with only one void side");
3273 result_type
= void_type_node
;
3275 else if (code1
== POINTER_TYPE
&& code2
== POINTER_TYPE
)
3277 if (comp_target_types (type1
, type2
))
3278 result_type
= common_pointer_type (type1
, type2
);
3279 else if (null_pointer_constant_p (orig_op1
))
3280 result_type
= qualify_type (type2
, type1
);
3281 else if (null_pointer_constant_p (orig_op2
))
3282 result_type
= qualify_type (type1
, type2
);
3283 else if (VOID_TYPE_P (TREE_TYPE (type1
)))
3285 if (pedantic
&& TREE_CODE (TREE_TYPE (type2
)) == FUNCTION_TYPE
)
3286 pedwarn ("ISO C forbids conditional expr between "
3287 "%<void *%> and function pointer");
3288 result_type
= build_pointer_type (qualify_type (TREE_TYPE (type1
),
3289 TREE_TYPE (type2
)));
3291 else if (VOID_TYPE_P (TREE_TYPE (type2
)))
3293 if (pedantic
&& TREE_CODE (TREE_TYPE (type1
)) == FUNCTION_TYPE
)
3294 pedwarn ("ISO C forbids conditional expr between "
3295 "%<void *%> and function pointer");
3296 result_type
= build_pointer_type (qualify_type (TREE_TYPE (type2
),
3297 TREE_TYPE (type1
)));
3301 pedwarn ("pointer type mismatch in conditional expression");
3302 result_type
= build_pointer_type (void_type_node
);
3305 else if (code1
== POINTER_TYPE
&& code2
== INTEGER_TYPE
)
3307 if (!null_pointer_constant_p (orig_op2
))
3308 pedwarn ("pointer/integer type mismatch in conditional expression");
3311 op2
= null_pointer_node
;
3313 result_type
= type1
;
3315 else if (code2
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
3317 if (!null_pointer_constant_p (orig_op1
))
3318 pedwarn ("pointer/integer type mismatch in conditional expression");
3321 op1
= null_pointer_node
;
3323 result_type
= type2
;
3328 if (flag_cond_mismatch
)
3329 result_type
= void_type_node
;
3332 error ("type mismatch in conditional expression");
3333 return error_mark_node
;
3337 /* Merge const and volatile flags of the incoming types. */
3339 = build_type_variant (result_type
,
3340 TREE_READONLY (op1
) || TREE_READONLY (op2
),
3341 TREE_THIS_VOLATILE (op1
) || TREE_THIS_VOLATILE (op2
));
3343 if (result_type
!= TREE_TYPE (op1
))
3344 op1
= convert_and_check (result_type
, op1
);
3345 if (result_type
!= TREE_TYPE (op2
))
3346 op2
= convert_and_check (result_type
, op2
);
3348 return fold_build3 (COND_EXPR
, result_type
, ifexp
, op1
, op2
);
3351 /* Return a compound expression that performs two expressions and
3352 returns the value of the second of them. */
3355 build_compound_expr (tree expr1
, tree expr2
)
3357 if (!TREE_SIDE_EFFECTS (expr1
))
3359 /* The left-hand operand of a comma expression is like an expression
3360 statement: with -Wextra or -Wunused, we should warn if it doesn't have
3361 any side-effects, unless it was explicitly cast to (void). */
3362 if (warn_unused_value
)
3364 if (VOID_TYPE_P (TREE_TYPE (expr1
))
3365 && (TREE_CODE (expr1
) == NOP_EXPR
3366 || TREE_CODE (expr1
) == CONVERT_EXPR
))
3368 else if (VOID_TYPE_P (TREE_TYPE (expr1
))
3369 && TREE_CODE (expr1
) == COMPOUND_EXPR
3370 && (TREE_CODE (TREE_OPERAND (expr1
, 1)) == CONVERT_EXPR
3371 || TREE_CODE (TREE_OPERAND (expr1
, 1)) == NOP_EXPR
))
3372 ; /* (void) a, (void) b, c */
3374 warning (0, "left-hand operand of comma expression has no effect");
3378 /* With -Wunused, we should also warn if the left-hand operand does have
3379 side-effects, but computes a value which is not used. For example, in
3380 `foo() + bar(), baz()' the result of the `+' operator is not used,
3381 so we should issue a warning. */
3382 else if (warn_unused_value
)
3383 warn_if_unused_value (expr1
, input_location
);
3385 return build2 (COMPOUND_EXPR
, TREE_TYPE (expr2
), expr1
, expr2
);
3388 /* Build an expression representing a cast to type TYPE of expression EXPR. */
3391 build_c_cast (tree type
, tree expr
)
3395 if (type
== error_mark_node
|| expr
== error_mark_node
)
3396 return error_mark_node
;
3398 /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing
3399 only in <protocol> qualifications. But when constructing cast expressions,
3400 the protocols do matter and must be kept around. */
3401 if (objc_is_object_ptr (type
) && objc_is_object_ptr (TREE_TYPE (expr
)))
3402 return build1 (NOP_EXPR
, type
, expr
);
3404 type
= TYPE_MAIN_VARIANT (type
);
3406 if (TREE_CODE (type
) == ARRAY_TYPE
)
3408 error ("cast specifies array type");
3409 return error_mark_node
;
3412 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3414 error ("cast specifies function type");
3415 return error_mark_node
;
3418 if (type
== TYPE_MAIN_VARIANT (TREE_TYPE (value
)))
3422 if (TREE_CODE (type
) == RECORD_TYPE
3423 || TREE_CODE (type
) == UNION_TYPE
)
3424 pedwarn ("ISO C forbids casting nonscalar to the same type");
3427 else if (TREE_CODE (type
) == UNION_TYPE
)
3431 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
3432 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field
)),
3433 TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
3441 pedwarn ("ISO C forbids casts to union type");
3442 t
= digest_init (type
,
3443 build_constructor_single (type
, field
, value
),
3445 TREE_CONSTANT (t
) = TREE_CONSTANT (value
);
3446 TREE_INVARIANT (t
) = TREE_INVARIANT (value
);
3449 error ("cast to union type from type not present in union");
3450 return error_mark_node
;
3456 if (type
== void_type_node
)
3457 return build1 (CONVERT_EXPR
, type
, value
);
3459 otype
= TREE_TYPE (value
);
3461 /* Optionally warn about potentially worrisome casts. */
3464 && TREE_CODE (type
) == POINTER_TYPE
3465 && TREE_CODE (otype
) == POINTER_TYPE
)
3467 tree in_type
= type
;
3468 tree in_otype
= otype
;
3472 /* Check that the qualifiers on IN_TYPE are a superset of
3473 the qualifiers of IN_OTYPE. The outermost level of
3474 POINTER_TYPE nodes is uninteresting and we stop as soon
3475 as we hit a non-POINTER_TYPE node on either type. */
3478 in_otype
= TREE_TYPE (in_otype
);
3479 in_type
= TREE_TYPE (in_type
);
3481 /* GNU C allows cv-qualified function types. 'const'
3482 means the function is very pure, 'volatile' means it
3483 can't return. We need to warn when such qualifiers
3484 are added, not when they're taken away. */
3485 if (TREE_CODE (in_otype
) == FUNCTION_TYPE
3486 && TREE_CODE (in_type
) == FUNCTION_TYPE
)
3487 added
|= (TYPE_QUALS (in_type
) & ~TYPE_QUALS (in_otype
));
3489 discarded
|= (TYPE_QUALS (in_otype
) & ~TYPE_QUALS (in_type
));
3491 while (TREE_CODE (in_type
) == POINTER_TYPE
3492 && TREE_CODE (in_otype
) == POINTER_TYPE
);
3495 warning (0, "cast adds new qualifiers to function type");
3498 /* There are qualifiers present in IN_OTYPE that are not
3499 present in IN_TYPE. */
3500 warning (0, "cast discards qualifiers from pointer target type");
3503 /* Warn about possible alignment problems. */
3504 if (STRICT_ALIGNMENT
3505 && TREE_CODE (type
) == POINTER_TYPE
3506 && TREE_CODE (otype
) == POINTER_TYPE
3507 && TREE_CODE (TREE_TYPE (otype
)) != VOID_TYPE
3508 && TREE_CODE (TREE_TYPE (otype
)) != FUNCTION_TYPE
3509 /* Don't warn about opaque types, where the actual alignment
3510 restriction is unknown. */
3511 && !((TREE_CODE (TREE_TYPE (otype
)) == UNION_TYPE
3512 || TREE_CODE (TREE_TYPE (otype
)) == RECORD_TYPE
)
3513 && TYPE_MODE (TREE_TYPE (otype
)) == VOIDmode
)
3514 && TYPE_ALIGN (TREE_TYPE (type
)) > TYPE_ALIGN (TREE_TYPE (otype
)))
3515 warning (OPT_Wcast_align
,
3516 "cast increases required alignment of target type");
3518 if (TREE_CODE (type
) == INTEGER_TYPE
3519 && TREE_CODE (otype
) == POINTER_TYPE
3520 && TYPE_PRECISION (type
) != TYPE_PRECISION (otype
))
3521 /* Unlike conversion of integers to pointers, where the
3522 warning is disabled for converting constants because
3523 of cases such as SIG_*, warn about converting constant
3524 pointers to integers. In some cases it may cause unwanted
3525 sign extension, and a warning is appropriate. */
3526 warning (OPT_Wpointer_to_int_cast
,
3527 "cast from pointer to integer of different size");
3529 if (TREE_CODE (value
) == CALL_EXPR
3530 && TREE_CODE (type
) != TREE_CODE (otype
))
3531 warning (OPT_Wbad_function_cast
, "cast from function call of type %qT "
3532 "to non-matching type %qT", otype
, type
);
3534 if (TREE_CODE (type
) == POINTER_TYPE
3535 && TREE_CODE (otype
) == INTEGER_TYPE
3536 && TYPE_PRECISION (type
) != TYPE_PRECISION (otype
)
3537 /* Don't warn about converting any constant. */
3538 && !TREE_CONSTANT (value
))
3539 warning (OPT_Wint_to_pointer_cast
, "cast to pointer from integer "
3540 "of different size");
3542 strict_aliasing_warning (otype
, type
, expr
);
3544 /* If pedantic, warn for conversions between function and object
3545 pointer types, except for converting a null pointer constant
3546 to function pointer type. */
3548 && TREE_CODE (type
) == POINTER_TYPE
3549 && TREE_CODE (otype
) == POINTER_TYPE
3550 && TREE_CODE (TREE_TYPE (otype
)) == FUNCTION_TYPE
3551 && TREE_CODE (TREE_TYPE (type
)) != FUNCTION_TYPE
)
3552 pedwarn ("ISO C forbids conversion of function pointer to object pointer type");
3555 && TREE_CODE (type
) == POINTER_TYPE
3556 && TREE_CODE (otype
) == POINTER_TYPE
3557 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
3558 && TREE_CODE (TREE_TYPE (otype
)) != FUNCTION_TYPE
3559 && !null_pointer_constant_p (value
))
3560 pedwarn ("ISO C forbids conversion of object pointer to function pointer type");
3563 value
= convert (type
, value
);
3565 /* Ignore any integer overflow caused by the cast. */
3566 if (TREE_CODE (value
) == INTEGER_CST
)
3568 if (CONSTANT_CLASS_P (ovalue
)
3569 && (TREE_OVERFLOW (ovalue
) || TREE_CONSTANT_OVERFLOW (ovalue
)))
3571 /* Avoid clobbering a shared constant. */
3572 value
= copy_node (value
);
3573 TREE_OVERFLOW (value
) = TREE_OVERFLOW (ovalue
);
3574 TREE_CONSTANT_OVERFLOW (value
) = TREE_CONSTANT_OVERFLOW (ovalue
);
3576 else if (TREE_OVERFLOW (value
) || TREE_CONSTANT_OVERFLOW (value
))
3577 /* Reset VALUE's overflow flags, ensuring constant sharing. */
3578 value
= build_int_cst_wide (TREE_TYPE (value
),
3579 TREE_INT_CST_LOW (value
),
3580 TREE_INT_CST_HIGH (value
));
3584 /* Don't let a cast be an lvalue. */
3586 value
= non_lvalue (value
);
3591 /* Interpret a cast of expression EXPR to type TYPE. */
3593 c_cast_expr (struct c_type_name
*type_name
, tree expr
)
3596 int saved_wsp
= warn_strict_prototypes
;
3598 /* This avoids warnings about unprototyped casts on
3599 integers. E.g. "#define SIG_DFL (void(*)())0". */
3600 if (TREE_CODE (expr
) == INTEGER_CST
)
3601 warn_strict_prototypes
= 0;
3602 type
= groktypename (type_name
);
3603 warn_strict_prototypes
= saved_wsp
;
3605 return build_c_cast (type
, expr
);
3609 /* Build an assignment expression of lvalue LHS from value RHS.
3610 MODIFYCODE is the code for a binary operator that we use
3611 to combine the old value of LHS with RHS to get the new value.
3612 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
3615 build_modify_expr (tree lhs
, enum tree_code modifycode
, tree rhs
)
3619 tree lhstype
= TREE_TYPE (lhs
);
3620 tree olhstype
= lhstype
;
3622 /* Types that aren't fully specified cannot be used in assignments. */
3623 lhs
= require_complete_type (lhs
);
3625 /* Avoid duplicate error messages from operands that had errors. */
3626 if (TREE_CODE (lhs
) == ERROR_MARK
|| TREE_CODE (rhs
) == ERROR_MARK
)
3627 return error_mark_node
;
3629 STRIP_TYPE_NOPS (rhs
);
3633 /* If a binary op has been requested, combine the old LHS value with the RHS
3634 producing the value we should actually store into the LHS. */
3636 if (modifycode
!= NOP_EXPR
)
3638 lhs
= stabilize_reference (lhs
);
3639 newrhs
= build_binary_op (modifycode
, lhs
, rhs
, 1);
3642 if (!lvalue_or_else (lhs
, lv_assign
))
3643 return error_mark_node
;
3645 /* Give an error for storing in something that is 'const'. */
3647 if (TREE_READONLY (lhs
) || TYPE_READONLY (lhstype
)
3648 || ((TREE_CODE (lhstype
) == RECORD_TYPE
3649 || TREE_CODE (lhstype
) == UNION_TYPE
)
3650 && C_TYPE_FIELDS_READONLY (lhstype
)))
3652 readonly_error (lhs
, lv_assign
);
3653 return error_mark_node
;
3656 /* If storing into a structure or union member,
3657 it has probably been given type `int'.
3658 Compute the type that would go with
3659 the actual amount of storage the member occupies. */
3661 if (TREE_CODE (lhs
) == COMPONENT_REF
3662 && (TREE_CODE (lhstype
) == INTEGER_TYPE
3663 || TREE_CODE (lhstype
) == BOOLEAN_TYPE
3664 || TREE_CODE (lhstype
) == REAL_TYPE
3665 || TREE_CODE (lhstype
) == ENUMERAL_TYPE
))
3666 lhstype
= TREE_TYPE (get_unwidened (lhs
, 0));
3668 /* If storing in a field that is in actuality a short or narrower than one,
3669 we must store in the field in its actual type. */
3671 if (lhstype
!= TREE_TYPE (lhs
))
3673 lhs
= copy_node (lhs
);
3674 TREE_TYPE (lhs
) = lhstype
;
3677 /* Convert new value to destination type. */
3679 newrhs
= convert_for_assignment (lhstype
, newrhs
, ic_assign
,
3680 NULL_TREE
, NULL_TREE
, 0);
3681 if (TREE_CODE (newrhs
) == ERROR_MARK
)
3682 return error_mark_node
;
3684 /* Emit ObjC write barrier, if necessary. */
3685 if (c_dialect_objc () && flag_objc_gc
)
3687 result
= objc_generate_write_barrier (lhs
, modifycode
, newrhs
);
3692 /* Scan operands. */
3694 result
= build2 (MODIFY_EXPR
, lhstype
, lhs
, newrhs
);
3695 TREE_SIDE_EFFECTS (result
) = 1;
3697 /* If we got the LHS in a different type for storing in,
3698 convert the result back to the nominal type of LHS
3699 so that the value we return always has the same type
3700 as the LHS argument. */
3702 if (olhstype
== TREE_TYPE (result
))
3704 return convert_for_assignment (olhstype
, result
, ic_assign
,
3705 NULL_TREE
, NULL_TREE
, 0);
3708 /* Convert value RHS to type TYPE as preparation for an assignment
3709 to an lvalue of type TYPE.
3710 The real work of conversion is done by `convert'.
3711 The purpose of this function is to generate error messages
3712 for assignments that are not allowed in C.
3713 ERRTYPE says whether it is argument passing, assignment,
3714 initialization or return.
3716 FUNCTION is a tree for the function being called.
3717 PARMNUM is the number of the argument, for printing in error messages. */
3720 convert_for_assignment (tree type
, tree rhs
, enum impl_conv errtype
,
3721 tree fundecl
, tree function
, int parmnum
)
3723 enum tree_code codel
= TREE_CODE (type
);
3725 enum tree_code coder
;
3726 tree rname
= NULL_TREE
;
3727 bool objc_ok
= false;
3729 if (errtype
== ic_argpass
|| errtype
== ic_argpass_nonproto
)
3732 /* Change pointer to function to the function itself for
3734 if (TREE_CODE (function
) == ADDR_EXPR
3735 && TREE_CODE (TREE_OPERAND (function
, 0)) == FUNCTION_DECL
)
3736 function
= TREE_OPERAND (function
, 0);
3738 /* Handle an ObjC selector specially for diagnostics. */
3739 selector
= objc_message_selector ();
3741 if (selector
&& parmnum
> 2)
3748 /* This macro is used to emit diagnostics to ensure that all format
3749 strings are complete sentences, visible to gettext and checked at
3751 #define WARN_FOR_ASSIGNMENT(AR, AS, IN, RE) \
3756 pedwarn (AR, parmnum, rname); \
3758 case ic_argpass_nonproto: \
3759 warning (0, AR, parmnum, rname); \
3771 gcc_unreachable (); \
3775 STRIP_TYPE_NOPS (rhs
);
3777 if (optimize
&& TREE_CODE (rhs
) == VAR_DECL
3778 && TREE_CODE (TREE_TYPE (rhs
)) != ARRAY_TYPE
)
3779 rhs
= decl_constant_value_for_broken_optimization (rhs
);
3781 rhstype
= TREE_TYPE (rhs
);
3782 coder
= TREE_CODE (rhstype
);
3784 if (coder
== ERROR_MARK
)
3785 return error_mark_node
;
3787 if (c_dialect_objc ())
3810 objc_ok
= objc_compare_types (type
, rhstype
, parmno
, rname
);
3813 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (rhstype
))
3815 overflow_warning (rhs
);
3819 if (coder
== VOID_TYPE
)
3821 /* Except for passing an argument to an unprototyped function,
3822 this is a constraint violation. When passing an argument to
3823 an unprototyped function, it is compile-time undefined;
3824 making it a constraint in that case was rejected in
3826 error ("void value not ignored as it ought to be");
3827 return error_mark_node
;
3829 /* A type converts to a reference to it.
3830 This code doesn't fully support references, it's just for the
3831 special case of va_start and va_copy. */
3832 if (codel
== REFERENCE_TYPE
3833 && comptypes (TREE_TYPE (type
), TREE_TYPE (rhs
)) == 1)
3835 if (!lvalue_p (rhs
))
3837 error ("cannot pass rvalue to reference parameter");
3838 return error_mark_node
;
3840 if (!c_mark_addressable (rhs
))
3841 return error_mark_node
;
3842 rhs
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (rhs
)), rhs
);
3844 /* We already know that these two types are compatible, but they
3845 may not be exactly identical. In fact, `TREE_TYPE (type)' is
3846 likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
3847 likely to be va_list, a typedef to __builtin_va_list, which
3848 is different enough that it will cause problems later. */
3849 if (TREE_TYPE (TREE_TYPE (rhs
)) != TREE_TYPE (type
))
3850 rhs
= build1 (NOP_EXPR
, build_pointer_type (TREE_TYPE (type
)), rhs
);
3852 rhs
= build1 (NOP_EXPR
, type
, rhs
);
3855 /* Some types can interconvert without explicit casts. */
3856 else if (codel
== VECTOR_TYPE
&& coder
== VECTOR_TYPE
3857 && vector_types_convertible_p (type
, TREE_TYPE (rhs
)))
3858 return convert (type
, rhs
);
3859 /* Arithmetic types all interconvert, and enum is treated like int. */
3860 else if ((codel
== INTEGER_TYPE
|| codel
== REAL_TYPE
3861 || codel
== ENUMERAL_TYPE
|| codel
== COMPLEX_TYPE
3862 || codel
== BOOLEAN_TYPE
)
3863 && (coder
== INTEGER_TYPE
|| coder
== REAL_TYPE
3864 || coder
== ENUMERAL_TYPE
|| coder
== COMPLEX_TYPE
3865 || coder
== BOOLEAN_TYPE
))
3866 return convert_and_check (type
, rhs
);
3868 /* Conversion to a transparent union from its member types.
3869 This applies only to function arguments. */
3870 else if (codel
== UNION_TYPE
&& TYPE_TRANSPARENT_UNION (type
)
3871 && (errtype
== ic_argpass
|| errtype
== ic_argpass_nonproto
))
3873 tree memb
, marginal_memb
= NULL_TREE
;
3875 for (memb
= TYPE_FIELDS (type
); memb
; memb
= TREE_CHAIN (memb
))
3877 tree memb_type
= TREE_TYPE (memb
);
3879 if (comptypes (TYPE_MAIN_VARIANT (memb_type
),
3880 TYPE_MAIN_VARIANT (rhstype
)))
3883 if (TREE_CODE (memb_type
) != POINTER_TYPE
)
3886 if (coder
== POINTER_TYPE
)
3888 tree ttl
= TREE_TYPE (memb_type
);
3889 tree ttr
= TREE_TYPE (rhstype
);
3891 /* Any non-function converts to a [const][volatile] void *
3892 and vice versa; otherwise, targets must be the same.
3893 Meanwhile, the lhs target must have all the qualifiers of
3895 if (VOID_TYPE_P (ttl
) || VOID_TYPE_P (ttr
)
3896 || comp_target_types (memb_type
, rhstype
))
3898 /* If this type won't generate any warnings, use it. */
3899 if (TYPE_QUALS (ttl
) == TYPE_QUALS (ttr
)
3900 || ((TREE_CODE (ttr
) == FUNCTION_TYPE
3901 && TREE_CODE (ttl
) == FUNCTION_TYPE
)
3902 ? ((TYPE_QUALS (ttl
) | TYPE_QUALS (ttr
))
3903 == TYPE_QUALS (ttr
))
3904 : ((TYPE_QUALS (ttl
) | TYPE_QUALS (ttr
))
3905 == TYPE_QUALS (ttl
))))
3908 /* Keep looking for a better type, but remember this one. */
3910 marginal_memb
= memb
;
3914 /* Can convert integer zero to any pointer type. */
3915 if (null_pointer_constant_p (rhs
))
3917 rhs
= null_pointer_node
;
3922 if (memb
|| marginal_memb
)
3926 /* We have only a marginally acceptable member type;
3927 it needs a warning. */
3928 tree ttl
= TREE_TYPE (TREE_TYPE (marginal_memb
));
3929 tree ttr
= TREE_TYPE (rhstype
);
3931 /* Const and volatile mean something different for function
3932 types, so the usual warnings are not appropriate. */
3933 if (TREE_CODE (ttr
) == FUNCTION_TYPE
3934 && TREE_CODE (ttl
) == FUNCTION_TYPE
)
3936 /* Because const and volatile on functions are
3937 restrictions that say the function will not do
3938 certain things, it is okay to use a const or volatile
3939 function where an ordinary one is wanted, but not
3941 if (TYPE_QUALS (ttl
) & ~TYPE_QUALS (ttr
))
3942 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE "
3943 "makes qualified function "
3944 "pointer from unqualified"),
3945 G_("assignment makes qualified "
3946 "function pointer from "
3948 G_("initialization makes qualified "
3949 "function pointer from "
3951 G_("return makes qualified function "
3952 "pointer from unqualified"));
3954 else if (TYPE_QUALS (ttr
) & ~TYPE_QUALS (ttl
))
3955 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards "
3956 "qualifiers from pointer target type"),
3957 G_("assignment discards qualifiers "
3958 "from pointer target type"),
3959 G_("initialization discards qualifiers "
3960 "from pointer target type"),
3961 G_("return discards qualifiers from "
3962 "pointer target type"));
3964 memb
= marginal_memb
;
3967 if (pedantic
&& (!fundecl
|| !DECL_IN_SYSTEM_HEADER (fundecl
)))
3968 pedwarn ("ISO C prohibits argument conversion to union type");
3970 return build_constructor_single (type
, memb
, rhs
);
3974 /* Conversions among pointers */
3975 else if ((codel
== POINTER_TYPE
|| codel
== REFERENCE_TYPE
)
3976 && (coder
== codel
))
3978 tree ttl
= TREE_TYPE (type
);
3979 tree ttr
= TREE_TYPE (rhstype
);
3982 bool is_opaque_pointer
;
3983 int target_cmp
= 0; /* Cache comp_target_types () result. */
3985 if (TREE_CODE (mvl
) != ARRAY_TYPE
)
3986 mvl
= TYPE_MAIN_VARIANT (mvl
);
3987 if (TREE_CODE (mvr
) != ARRAY_TYPE
)
3988 mvr
= TYPE_MAIN_VARIANT (mvr
);
3989 /* Opaque pointers are treated like void pointers. */
3990 is_opaque_pointer
= (targetm
.vector_opaque_p (type
)
3991 || targetm
.vector_opaque_p (rhstype
))
3992 && TREE_CODE (ttl
) == VECTOR_TYPE
3993 && TREE_CODE (ttr
) == VECTOR_TYPE
;
3995 /* C++ does not allow the implicit conversion void* -> T*. However,
3996 for the purpose of reducing the number of false positives, we
3997 tolerate the special case of
4001 where NULL is typically defined in C to be '(void *) 0'. */
4002 if (VOID_TYPE_P (ttr
) && rhs
!= null_pointer_node
&& !VOID_TYPE_P (ttl
))
4003 warning (OPT_Wc___compat
, "request for implicit conversion from "
4004 "%qT to %qT not permitted in C++", rhstype
, type
);
4006 /* Check if the right-hand side has a format attribute but the
4007 left-hand side doesn't. */
4008 if (warn_missing_format_attribute
4009 && check_missing_format_attribute (type
, rhstype
))
4014 case ic_argpass_nonproto
:
4015 warning (OPT_Wmissing_format_attribute
,
4016 "argument %d of %qE might be "
4017 "a candidate for a format attribute",
4021 warning (OPT_Wmissing_format_attribute
,
4022 "assignment left-hand side might be "
4023 "a candidate for a format attribute");
4026 warning (OPT_Wmissing_format_attribute
,
4027 "initialization left-hand side might be "
4028 "a candidate for a format attribute");
4031 warning (OPT_Wmissing_format_attribute
,
4032 "return type might be "
4033 "a candidate for a format attribute");
4040 /* Any non-function converts to a [const][volatile] void *
4041 and vice versa; otherwise, targets must be the same.
4042 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
4043 if (VOID_TYPE_P (ttl
) || VOID_TYPE_P (ttr
)
4044 || (target_cmp
= comp_target_types (type
, rhstype
))
4045 || is_opaque_pointer
4046 || (c_common_unsigned_type (mvl
)
4047 == c_common_unsigned_type (mvr
)))
4050 && ((VOID_TYPE_P (ttl
) && TREE_CODE (ttr
) == FUNCTION_TYPE
)
4053 && !null_pointer_constant_p (rhs
)
4054 && TREE_CODE (ttl
) == FUNCTION_TYPE
)))
4055 WARN_FOR_ASSIGNMENT (G_("ISO C forbids passing argument %d of "
4056 "%qE between function pointer "
4058 G_("ISO C forbids assignment between "
4059 "function pointer and %<void *%>"),
4060 G_("ISO C forbids initialization between "
4061 "function pointer and %<void *%>"),
4062 G_("ISO C forbids return between function "
4063 "pointer and %<void *%>"));
4064 /* Const and volatile mean something different for function types,
4065 so the usual warnings are not appropriate. */
4066 else if (TREE_CODE (ttr
) != FUNCTION_TYPE
4067 && TREE_CODE (ttl
) != FUNCTION_TYPE
)
4069 if (TYPE_QUALS (ttr
) & ~TYPE_QUALS (ttl
))
4071 /* Types differing only by the presence of the 'volatile'
4072 qualifier are acceptable if the 'volatile' has been added
4073 in by the Objective-C EH machinery. */
4074 if (!objc_type_quals_match (ttl
, ttr
))
4075 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards "
4076 "qualifiers from pointer target type"),
4077 G_("assignment discards qualifiers "
4078 "from pointer target type"),
4079 G_("initialization discards qualifiers "
4080 "from pointer target type"),
4081 G_("return discards qualifiers from "
4082 "pointer target type"));
4084 /* If this is not a case of ignoring a mismatch in signedness,
4086 else if (VOID_TYPE_P (ttl
) || VOID_TYPE_P (ttr
)
4089 /* If there is a mismatch, do warn. */
4090 else if (warn_pointer_sign
)
4091 WARN_FOR_ASSIGNMENT (G_("pointer targets in passing argument "
4092 "%d of %qE differ in signedness"),
4093 G_("pointer targets in assignment "
4094 "differ in signedness"),
4095 G_("pointer targets in initialization "
4096 "differ in signedness"),
4097 G_("pointer targets in return differ "
4100 else if (TREE_CODE (ttl
) == FUNCTION_TYPE
4101 && TREE_CODE (ttr
) == FUNCTION_TYPE
)
4103 /* Because const and volatile on functions are restrictions
4104 that say the function will not do certain things,
4105 it is okay to use a const or volatile function
4106 where an ordinary one is wanted, but not vice-versa. */
4107 if (TYPE_QUALS (ttl
) & ~TYPE_QUALS (ttr
))
4108 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes "
4109 "qualified function pointer "
4110 "from unqualified"),
4111 G_("assignment makes qualified function "
4112 "pointer from unqualified"),
4113 G_("initialization makes qualified "
4114 "function pointer from unqualified"),
4115 G_("return makes qualified function "
4116 "pointer from unqualified"));
4120 /* Avoid warning about the volatile ObjC EH puts on decls. */
4122 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE from "
4123 "incompatible pointer type"),
4124 G_("assignment from incompatible pointer type"),
4125 G_("initialization from incompatible "
4127 G_("return from incompatible pointer type"));
4129 return convert (type
, rhs
);
4131 else if (codel
== POINTER_TYPE
&& coder
== ARRAY_TYPE
)
4133 /* ??? This should not be an error when inlining calls to
4134 unprototyped functions. */
4135 error ("invalid use of non-lvalue array");
4136 return error_mark_node
;
4138 else if (codel
== POINTER_TYPE
&& coder
== INTEGER_TYPE
)
4140 /* An explicit constant 0 can convert to a pointer,
4141 or one that results from arithmetic, even including
4142 a cast to integer type. */
4143 if (!null_pointer_constant_p (rhs
))
4144 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes "
4145 "pointer from integer without a cast"),
4146 G_("assignment makes pointer from integer "
4148 G_("initialization makes pointer from "
4149 "integer without a cast"),
4150 G_("return makes pointer from integer "
4153 return convert (type
, rhs
);
4155 else if (codel
== INTEGER_TYPE
&& coder
== POINTER_TYPE
)
4157 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes integer "
4158 "from pointer without a cast"),
4159 G_("assignment makes integer from pointer "
4161 G_("initialization makes integer from pointer "
4163 G_("return makes integer from pointer "
4165 return convert (type
, rhs
);
4167 else if (codel
== BOOLEAN_TYPE
&& coder
== POINTER_TYPE
)
4168 return convert (type
, rhs
);
4173 case ic_argpass_nonproto
:
4174 /* ??? This should not be an error when inlining calls to
4175 unprototyped functions. */
4176 error ("incompatible type for argument %d of %qE", parmnum
, rname
);
4179 error ("incompatible types in assignment");
4182 error ("incompatible types in initialization");
4185 error ("incompatible types in return");
4191 return error_mark_node
;
4194 /* Convert VALUE for assignment into inlined parameter PARM. ARGNUM
4195 is used for error and waring reporting and indicates which argument
4196 is being processed. */
4199 c_convert_parm_for_inlining (tree parm
, tree value
, tree fn
, int argnum
)
4203 /* If FN was prototyped, the value has been converted already
4204 in convert_arguments. */
4205 if (!value
|| TYPE_ARG_TYPES (TREE_TYPE (fn
)))
4208 type
= TREE_TYPE (parm
);
4209 ret
= convert_for_assignment (type
, value
,
4210 ic_argpass_nonproto
, fn
,
4212 if (targetm
.calls
.promote_prototypes (TREE_TYPE (fn
))
4213 && INTEGRAL_TYPE_P (type
)
4214 && (TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
)))
4215 ret
= default_conversion (ret
);
4219 /* If VALUE is a compound expr all of whose expressions are constant, then
4220 return its value. Otherwise, return error_mark_node.
4222 This is for handling COMPOUND_EXPRs as initializer elements
4223 which is allowed with a warning when -pedantic is specified. */
4226 valid_compound_expr_initializer (tree value
, tree endtype
)
4228 if (TREE_CODE (value
) == COMPOUND_EXPR
)
4230 if (valid_compound_expr_initializer (TREE_OPERAND (value
, 0), endtype
)
4232 return error_mark_node
;
4233 return valid_compound_expr_initializer (TREE_OPERAND (value
, 1),
4236 else if (!initializer_constant_valid_p (value
, endtype
))
4237 return error_mark_node
;
4242 /* Perform appropriate conversions on the initial value of a variable,
4243 store it in the declaration DECL,
4244 and print any error messages that are appropriate.
4245 If the init is invalid, store an ERROR_MARK. */
4248 store_init_value (tree decl
, tree init
)
4252 /* If variable's type was invalidly declared, just ignore it. */
4254 type
= TREE_TYPE (decl
);
4255 if (TREE_CODE (type
) == ERROR_MARK
)
4258 /* Digest the specified initializer into an expression. */
4260 value
= digest_init (type
, init
, true, TREE_STATIC (decl
));
4262 /* Store the expression if valid; else report error. */
4264 if (!in_system_header
4265 && AGGREGATE_TYPE_P (TREE_TYPE (decl
)) && !TREE_STATIC (decl
))
4266 warning (OPT_Wtraditional
, "traditional C rejects automatic "
4267 "aggregate initialization");
4269 DECL_INITIAL (decl
) = value
;
4271 /* ANSI wants warnings about out-of-range constant initializers. */
4272 STRIP_TYPE_NOPS (value
);
4273 constant_expression_warning (value
);
4275 /* Check if we need to set array size from compound literal size. */
4276 if (TREE_CODE (type
) == ARRAY_TYPE
4277 && TYPE_DOMAIN (type
) == 0
4278 && value
!= error_mark_node
)
4280 tree inside_init
= init
;
4282 STRIP_TYPE_NOPS (inside_init
);
4283 inside_init
= fold (inside_init
);
4285 if (TREE_CODE (inside_init
) == COMPOUND_LITERAL_EXPR
)
4287 tree decl
= COMPOUND_LITERAL_EXPR_DECL (inside_init
);
4289 if (TYPE_DOMAIN (TREE_TYPE (decl
)))
4291 /* For int foo[] = (int [3]){1}; we need to set array size
4292 now since later on array initializer will be just the
4293 brace enclosed list of the compound literal. */
4294 TYPE_DOMAIN (type
) = TYPE_DOMAIN (TREE_TYPE (decl
));
4296 layout_decl (decl
, 0);
4302 /* Methods for storing and printing names for error messages. */
4304 /* Implement a spelling stack that allows components of a name to be pushed
4305 and popped. Each element on the stack is this structure. */
4317 #define SPELLING_STRING 1
4318 #define SPELLING_MEMBER 2
4319 #define SPELLING_BOUNDS 3
4321 static struct spelling
*spelling
; /* Next stack element (unused). */
4322 static struct spelling
*spelling_base
; /* Spelling stack base. */
4323 static int spelling_size
; /* Size of the spelling stack. */
4325 /* Macros to save and restore the spelling stack around push_... functions.
4326 Alternative to SAVE_SPELLING_STACK. */
4328 #define SPELLING_DEPTH() (spelling - spelling_base)
4329 #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH))
4331 /* Push an element on the spelling stack with type KIND and assign VALUE
4334 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
4336 int depth = SPELLING_DEPTH (); \
4338 if (depth >= spelling_size) \
4340 spelling_size += 10; \
4341 spelling_base = XRESIZEVEC (struct spelling, spelling_base, \
4343 RESTORE_SPELLING_DEPTH (depth); \
4346 spelling->kind = (KIND); \
4347 spelling->MEMBER = (VALUE); \
4351 /* Push STRING on the stack. Printed literally. */
4354 push_string (const char *string
)
4356 PUSH_SPELLING (SPELLING_STRING
, string
, u
.s
);
4359 /* Push a member name on the stack. Printed as '.' STRING. */
4362 push_member_name (tree decl
)
4364 const char *const string
4365 = DECL_NAME (decl
) ? IDENTIFIER_POINTER (DECL_NAME (decl
)) : "<anonymous>";
4366 PUSH_SPELLING (SPELLING_MEMBER
, string
, u
.s
);
4369 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
4372 push_array_bounds (int bounds
)
4374 PUSH_SPELLING (SPELLING_BOUNDS
, bounds
, u
.i
);
4377 /* Compute the maximum size in bytes of the printed spelling. */
4380 spelling_length (void)
4385 for (p
= spelling_base
; p
< spelling
; p
++)
4387 if (p
->kind
== SPELLING_BOUNDS
)
4390 size
+= strlen (p
->u
.s
) + 1;
4396 /* Print the spelling to BUFFER and return it. */
4399 print_spelling (char *buffer
)
4404 for (p
= spelling_base
; p
< spelling
; p
++)
4405 if (p
->kind
== SPELLING_BOUNDS
)
4407 sprintf (d
, "[%d]", p
->u
.i
);
4413 if (p
->kind
== SPELLING_MEMBER
)
4415 for (s
= p
->u
.s
; (*d
= *s
++); d
++)
4422 /* Issue an error message for a bad initializer component.
4423 MSGID identifies the message.
4424 The component name is taken from the spelling stack. */
4427 error_init (const char *msgid
)
4431 error ("%s", _(msgid
));
4432 ofwhat
= print_spelling ((char *) alloca (spelling_length () + 1));
4434 error ("(near initialization for %qs)", ofwhat
);
4437 /* Issue a pedantic warning for a bad initializer component.
4438 MSGID identifies the message.
4439 The component name is taken from the spelling stack. */
4442 pedwarn_init (const char *msgid
)
4446 pedwarn ("%s", _(msgid
));
4447 ofwhat
= print_spelling ((char *) alloca (spelling_length () + 1));
4449 pedwarn ("(near initialization for %qs)", ofwhat
);
4452 /* Issue a warning for a bad initializer component.
4453 MSGID identifies the message.
4454 The component name is taken from the spelling stack. */
4457 warning_init (const char *msgid
)
4461 warning (0, "%s", _(msgid
));
4462 ofwhat
= print_spelling ((char *) alloca (spelling_length () + 1));
4464 warning (0, "(near initialization for %qs)", ofwhat
);
4467 /* If TYPE is an array type and EXPR is a parenthesized string
4468 constant, warn if pedantic that EXPR is being used to initialize an
4469 object of type TYPE. */
4472 maybe_warn_string_init (tree type
, struct c_expr expr
)
4475 && TREE_CODE (type
) == ARRAY_TYPE
4476 && TREE_CODE (expr
.value
) == STRING_CST
4477 && expr
.original_code
!= STRING_CST
)
4478 pedwarn_init ("array initialized from parenthesized string constant");
4481 /* Digest the parser output INIT as an initializer for type TYPE.
4482 Return a C expression of type TYPE to represent the initial value.
4484 If INIT is a string constant, STRICT_STRING is true if it is
4485 unparenthesized or we should not warn here for it being parenthesized.
4486 For other types of INIT, STRICT_STRING is not used.
4488 REQUIRE_CONSTANT requests an error if non-constant initializers or
4489 elements are seen. */
4492 digest_init (tree type
, tree init
, bool strict_string
, int require_constant
)
4494 enum tree_code code
= TREE_CODE (type
);
4495 tree inside_init
= init
;
4497 if (type
== error_mark_node
4498 || init
== error_mark_node
4499 || TREE_TYPE (init
) == error_mark_node
)
4500 return error_mark_node
;
4502 STRIP_TYPE_NOPS (inside_init
);
4504 inside_init
= fold (inside_init
);
4506 /* Initialization of an array of chars from a string constant
4507 optionally enclosed in braces. */
4509 if (code
== ARRAY_TYPE
&& inside_init
4510 && TREE_CODE (inside_init
) == STRING_CST
)
4512 tree typ1
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
4513 /* Note that an array could be both an array of character type
4514 and an array of wchar_t if wchar_t is signed char or unsigned
4516 bool char_array
= (typ1
== char_type_node
4517 || typ1
== signed_char_type_node
4518 || typ1
== unsigned_char_type_node
);
4519 bool wchar_array
= !!comptypes (typ1
, wchar_type_node
);
4520 if (char_array
|| wchar_array
)
4524 expr
.value
= inside_init
;
4525 expr
.original_code
= (strict_string
? STRING_CST
: ERROR_MARK
);
4526 maybe_warn_string_init (type
, expr
);
4529 = (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init
)))
4532 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init
)),
4533 TYPE_MAIN_VARIANT (type
)))
4536 if (!wchar_array
&& !char_string
)
4538 error_init ("char-array initialized from wide string");
4539 return error_mark_node
;
4541 if (char_string
&& !char_array
)
4543 error_init ("wchar_t-array initialized from non-wide string");
4544 return error_mark_node
;
4547 TREE_TYPE (inside_init
) = type
;
4548 if (TYPE_DOMAIN (type
) != 0
4549 && TYPE_SIZE (type
) != 0
4550 && TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
4551 /* Subtract 1 (or sizeof (wchar_t))
4552 because it's ok to ignore the terminating null char
4553 that is counted in the length of the constant. */
4554 && 0 > compare_tree_int (TYPE_SIZE_UNIT (type
),
4555 TREE_STRING_LENGTH (inside_init
)
4556 - ((TYPE_PRECISION (typ1
)
4557 != TYPE_PRECISION (char_type_node
))
4558 ? (TYPE_PRECISION (wchar_type_node
)
4561 pedwarn_init ("initializer-string for array of chars is too long");
4565 else if (INTEGRAL_TYPE_P (typ1
))
4567 error_init ("array of inappropriate type initialized "
4568 "from string constant");
4569 return error_mark_node
;
4573 /* Build a VECTOR_CST from a *constant* vector constructor. If the
4574 vector constructor is not constant (e.g. {1,2,3,foo()}) then punt
4575 below and handle as a constructor. */
4576 if (code
== VECTOR_TYPE
4577 && TREE_CODE (TREE_TYPE (inside_init
)) == VECTOR_TYPE
4578 && vector_types_convertible_p (TREE_TYPE (inside_init
), type
)
4579 && TREE_CONSTANT (inside_init
))
4581 if (TREE_CODE (inside_init
) == VECTOR_CST
4582 && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init
)),
4583 TYPE_MAIN_VARIANT (type
)))
4586 if (TREE_CODE (inside_init
) == CONSTRUCTOR
)
4588 unsigned HOST_WIDE_INT ix
;
4590 bool constant_p
= true;
4592 /* Iterate through elements and check if all constructor
4593 elements are *_CSTs. */
4594 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (inside_init
), ix
, value
)
4595 if (!CONSTANT_CLASS_P (value
))
4602 return build_vector_from_ctor (type
,
4603 CONSTRUCTOR_ELTS (inside_init
));
4607 /* Any type can be initialized
4608 from an expression of the same type, optionally with braces. */
4610 if (inside_init
&& TREE_TYPE (inside_init
) != 0
4611 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init
)),
4612 TYPE_MAIN_VARIANT (type
))
4613 || (code
== ARRAY_TYPE
4614 && comptypes (TREE_TYPE (inside_init
), type
))
4615 || (code
== VECTOR_TYPE
4616 && comptypes (TREE_TYPE (inside_init
), type
))
4617 || (code
== POINTER_TYPE
4618 && TREE_CODE (TREE_TYPE (inside_init
)) == ARRAY_TYPE
4619 && comptypes (TREE_TYPE (TREE_TYPE (inside_init
)),
4620 TREE_TYPE (type
)))))
4622 if (code
== POINTER_TYPE
)
4624 if (TREE_CODE (TREE_TYPE (inside_init
)) == ARRAY_TYPE
)
4626 if (TREE_CODE (inside_init
) == STRING_CST
4627 || TREE_CODE (inside_init
) == COMPOUND_LITERAL_EXPR
)
4628 inside_init
= array_to_pointer_conversion (inside_init
);
4631 error_init ("invalid use of non-lvalue array");
4632 return error_mark_node
;
4637 if (code
== VECTOR_TYPE
)
4638 /* Although the types are compatible, we may require a
4640 inside_init
= convert (type
, inside_init
);
4642 if (require_constant
&& !flag_isoc99
4643 && TREE_CODE (inside_init
) == COMPOUND_LITERAL_EXPR
)
4645 /* As an extension, allow initializing objects with static storage
4646 duration with compound literals (which are then treated just as
4647 the brace enclosed list they contain). */
4648 tree decl
= COMPOUND_LITERAL_EXPR_DECL (inside_init
);
4649 inside_init
= DECL_INITIAL (decl
);
4652 if (code
== ARRAY_TYPE
&& TREE_CODE (inside_init
) != STRING_CST
4653 && TREE_CODE (inside_init
) != CONSTRUCTOR
)
4655 error_init ("array initialized from non-constant array expression");
4656 return error_mark_node
;
4659 if (optimize
&& TREE_CODE (inside_init
) == VAR_DECL
)
4660 inside_init
= decl_constant_value_for_broken_optimization (inside_init
);
4662 /* Compound expressions can only occur here if -pedantic or
4663 -pedantic-errors is specified. In the later case, we always want
4664 an error. In the former case, we simply want a warning. */
4665 if (require_constant
&& pedantic
4666 && TREE_CODE (inside_init
) == COMPOUND_EXPR
)
4669 = valid_compound_expr_initializer (inside_init
,
4670 TREE_TYPE (inside_init
));
4671 if (inside_init
== error_mark_node
)
4672 error_init ("initializer element is not constant");
4674 pedwarn_init ("initializer element is not constant");
4675 if (flag_pedantic_errors
)
4676 inside_init
= error_mark_node
;
4678 else if (require_constant
4679 && !initializer_constant_valid_p (inside_init
,
4680 TREE_TYPE (inside_init
)))
4682 error_init ("initializer element is not constant");
4683 inside_init
= error_mark_node
;
4686 /* Added to enable additional -Wmissing-format-attribute warnings. */
4687 if (TREE_CODE (TREE_TYPE (inside_init
)) == POINTER_TYPE
)
4688 inside_init
= convert_for_assignment (type
, inside_init
, ic_init
, NULL_TREE
,
4693 /* Handle scalar types, including conversions. */
4695 if (code
== INTEGER_TYPE
|| code
== REAL_TYPE
|| code
== POINTER_TYPE
4696 || code
== ENUMERAL_TYPE
|| code
== BOOLEAN_TYPE
|| code
== COMPLEX_TYPE
4697 || code
== VECTOR_TYPE
)
4699 if (TREE_CODE (TREE_TYPE (init
)) == ARRAY_TYPE
4700 && (TREE_CODE (init
) == STRING_CST
4701 || TREE_CODE (init
) == COMPOUND_LITERAL_EXPR
))
4702 init
= array_to_pointer_conversion (init
);
4704 = convert_for_assignment (type
, init
, ic_init
,
4705 NULL_TREE
, NULL_TREE
, 0);
4707 /* Check to see if we have already given an error message. */
4708 if (inside_init
== error_mark_node
)
4710 else if (require_constant
&& !TREE_CONSTANT (inside_init
))
4712 error_init ("initializer element is not constant");
4713 inside_init
= error_mark_node
;
4715 else if (require_constant
4716 && !initializer_constant_valid_p (inside_init
,
4717 TREE_TYPE (inside_init
)))
4719 error_init ("initializer element is not computable at load time");
4720 inside_init
= error_mark_node
;
4726 /* Come here only for records and arrays. */
4728 if (COMPLETE_TYPE_P (type
) && TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
4730 error_init ("variable-sized object may not be initialized");
4731 return error_mark_node
;
4734 error_init ("invalid initializer");
4735 return error_mark_node
;
4738 /* Handle initializers that use braces. */
4740 /* Type of object we are accumulating a constructor for.
4741 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
4742 static tree constructor_type
;
4744 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
4746 static tree constructor_fields
;
4748 /* For an ARRAY_TYPE, this is the specified index
4749 at which to store the next element we get. */
4750 static tree constructor_index
;
4752 /* For an ARRAY_TYPE, this is the maximum index. */
4753 static tree constructor_max_index
;
4755 /* For a RECORD_TYPE, this is the first field not yet written out. */
4756 static tree constructor_unfilled_fields
;
4758 /* For an ARRAY_TYPE, this is the index of the first element
4759 not yet written out. */
4760 static tree constructor_unfilled_index
;
4762 /* In a RECORD_TYPE, the byte index of the next consecutive field.
4763 This is so we can generate gaps between fields, when appropriate. */
4764 static tree constructor_bit_index
;
4766 /* If we are saving up the elements rather than allocating them,
4767 this is the list of elements so far (in reverse order,
4768 most recent first). */
4769 static VEC(constructor_elt
,gc
) *constructor_elements
;
4771 /* 1 if constructor should be incrementally stored into a constructor chain,
4772 0 if all the elements should be kept in AVL tree. */
4773 static int constructor_incremental
;
4775 /* 1 if so far this constructor's elements are all compile-time constants. */
4776 static int constructor_constant
;
4778 /* 1 if so far this constructor's elements are all valid address constants. */
4779 static int constructor_simple
;
4781 /* 1 if this constructor is erroneous so far. */
4782 static int constructor_erroneous
;
4784 /* Structure for managing pending initializer elements, organized as an
4789 struct init_node
*left
, *right
;
4790 struct init_node
*parent
;
4796 /* Tree of pending elements at this constructor level.
4797 These are elements encountered out of order
4798 which belong at places we haven't reached yet in actually
4800 Will never hold tree nodes across GC runs. */
4801 static struct init_node
*constructor_pending_elts
;
4803 /* The SPELLING_DEPTH of this constructor. */
4804 static int constructor_depth
;
4806 /* DECL node for which an initializer is being read.
4807 0 means we are reading a constructor expression
4808 such as (struct foo) {...}. */
4809 static tree constructor_decl
;
4811 /* Nonzero if this is an initializer for a top-level decl. */
4812 static int constructor_top_level
;
4814 /* Nonzero if there were any member designators in this initializer. */
4815 static int constructor_designated
;
4817 /* Nesting depth of designator list. */
4818 static int designator_depth
;
4820 /* Nonzero if there were diagnosed errors in this designator list. */
4821 static int designator_erroneous
;
4824 /* This stack has a level for each implicit or explicit level of
4825 structuring in the initializer, including the outermost one. It
4826 saves the values of most of the variables above. */
4828 struct constructor_range_stack
;
4830 struct constructor_stack
4832 struct constructor_stack
*next
;
4837 tree unfilled_index
;
4838 tree unfilled_fields
;
4840 VEC(constructor_elt
,gc
) *elements
;
4841 struct init_node
*pending_elts
;
4844 /* If value nonzero, this value should replace the entire
4845 constructor at this level. */
4846 struct c_expr replacement_value
;
4847 struct constructor_range_stack
*range_stack
;
4857 static struct constructor_stack
*constructor_stack
;
4859 /* This stack represents designators from some range designator up to
4860 the last designator in the list. */
4862 struct constructor_range_stack
4864 struct constructor_range_stack
*next
, *prev
;
4865 struct constructor_stack
*stack
;
4872 static struct constructor_range_stack
*constructor_range_stack
;
4874 /* This stack records separate initializers that are nested.
4875 Nested initializers can't happen in ANSI C, but GNU C allows them
4876 in cases like { ... (struct foo) { ... } ... }. */
4878 struct initializer_stack
4880 struct initializer_stack
*next
;
4882 struct constructor_stack
*constructor_stack
;
4883 struct constructor_range_stack
*constructor_range_stack
;
4884 VEC(constructor_elt
,gc
) *elements
;
4885 struct spelling
*spelling
;
4886 struct spelling
*spelling_base
;
4889 char require_constant_value
;
4890 char require_constant_elements
;
4893 static struct initializer_stack
*initializer_stack
;
4895 /* Prepare to parse and output the initializer for variable DECL. */
4898 start_init (tree decl
, tree asmspec_tree ATTRIBUTE_UNUSED
, int top_level
)
4901 struct initializer_stack
*p
= XNEW (struct initializer_stack
);
4903 p
->decl
= constructor_decl
;
4904 p
->require_constant_value
= require_constant_value
;
4905 p
->require_constant_elements
= require_constant_elements
;
4906 p
->constructor_stack
= constructor_stack
;
4907 p
->constructor_range_stack
= constructor_range_stack
;
4908 p
->elements
= constructor_elements
;
4909 p
->spelling
= spelling
;
4910 p
->spelling_base
= spelling_base
;
4911 p
->spelling_size
= spelling_size
;
4912 p
->top_level
= constructor_top_level
;
4913 p
->next
= initializer_stack
;
4914 initializer_stack
= p
;
4916 constructor_decl
= decl
;
4917 constructor_designated
= 0;
4918 constructor_top_level
= top_level
;
4920 if (decl
!= 0 && decl
!= error_mark_node
)
4922 require_constant_value
= TREE_STATIC (decl
);
4923 require_constant_elements
4924 = ((TREE_STATIC (decl
) || (pedantic
&& !flag_isoc99
))
4925 /* For a scalar, you can always use any value to initialize,
4926 even within braces. */
4927 && (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
4928 || TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
4929 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
4930 || TREE_CODE (TREE_TYPE (decl
)) == QUAL_UNION_TYPE
));
4931 locus
= IDENTIFIER_POINTER (DECL_NAME (decl
));
4935 require_constant_value
= 0;
4936 require_constant_elements
= 0;
4937 locus
= "(anonymous)";
4940 constructor_stack
= 0;
4941 constructor_range_stack
= 0;
4943 missing_braces_mentioned
= 0;
4947 RESTORE_SPELLING_DEPTH (0);
4950 push_string (locus
);
4956 struct initializer_stack
*p
= initializer_stack
;
4958 /* Free the whole constructor stack of this initializer. */
4959 while (constructor_stack
)
4961 struct constructor_stack
*q
= constructor_stack
;
4962 constructor_stack
= q
->next
;
4966 gcc_assert (!constructor_range_stack
);
4968 /* Pop back to the data of the outer initializer (if any). */
4969 free (spelling_base
);
4971 constructor_decl
= p
->decl
;
4972 require_constant_value
= p
->require_constant_value
;
4973 require_constant_elements
= p
->require_constant_elements
;
4974 constructor_stack
= p
->constructor_stack
;
4975 constructor_range_stack
= p
->constructor_range_stack
;
4976 constructor_elements
= p
->elements
;
4977 spelling
= p
->spelling
;
4978 spelling_base
= p
->spelling_base
;
4979 spelling_size
= p
->spelling_size
;
4980 constructor_top_level
= p
->top_level
;
4981 initializer_stack
= p
->next
;
4985 /* Call here when we see the initializer is surrounded by braces.
4986 This is instead of a call to push_init_level;
4987 it is matched by a call to pop_init_level.
4989 TYPE is the type to initialize, for a constructor expression.
4990 For an initializer for a decl, TYPE is zero. */
4993 really_start_incremental_init (tree type
)
4995 struct constructor_stack
*p
= XNEW (struct constructor_stack
);
4998 type
= TREE_TYPE (constructor_decl
);
5000 if (targetm
.vector_opaque_p (type
))
5001 error ("opaque vector types cannot be initialized");
5003 p
->type
= constructor_type
;
5004 p
->fields
= constructor_fields
;
5005 p
->index
= constructor_index
;
5006 p
->max_index
= constructor_max_index
;
5007 p
->unfilled_index
= constructor_unfilled_index
;
5008 p
->unfilled_fields
= constructor_unfilled_fields
;
5009 p
->bit_index
= constructor_bit_index
;
5010 p
->elements
= constructor_elements
;
5011 p
->constant
= constructor_constant
;
5012 p
->simple
= constructor_simple
;
5013 p
->erroneous
= constructor_erroneous
;
5014 p
->pending_elts
= constructor_pending_elts
;
5015 p
->depth
= constructor_depth
;
5016 p
->replacement_value
.value
= 0;
5017 p
->replacement_value
.original_code
= ERROR_MARK
;
5021 p
->incremental
= constructor_incremental
;
5022 p
->designated
= constructor_designated
;
5024 constructor_stack
= p
;
5026 constructor_constant
= 1;
5027 constructor_simple
= 1;
5028 constructor_depth
= SPELLING_DEPTH ();
5029 constructor_elements
= 0;
5030 constructor_pending_elts
= 0;
5031 constructor_type
= type
;
5032 constructor_incremental
= 1;
5033 constructor_designated
= 0;
5034 designator_depth
= 0;
5035 designator_erroneous
= 0;
5037 if (TREE_CODE (constructor_type
) == RECORD_TYPE
5038 || TREE_CODE (constructor_type
) == UNION_TYPE
)
5040 constructor_fields
= TYPE_FIELDS (constructor_type
);
5041 /* Skip any nameless bit fields at the beginning. */
5042 while (constructor_fields
!= 0 && DECL_C_BIT_FIELD (constructor_fields
)
5043 && DECL_NAME (constructor_fields
) == 0)
5044 constructor_fields
= TREE_CHAIN (constructor_fields
);
5046 constructor_unfilled_fields
= constructor_fields
;
5047 constructor_bit_index
= bitsize_zero_node
;
5049 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5051 if (TYPE_DOMAIN (constructor_type
))
5053 constructor_max_index
5054 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type
));
5056 /* Detect non-empty initializations of zero-length arrays. */
5057 if (constructor_max_index
== NULL_TREE
5058 && TYPE_SIZE (constructor_type
))
5059 constructor_max_index
= build_int_cst (NULL_TREE
, -1);
5061 /* constructor_max_index needs to be an INTEGER_CST. Attempts
5062 to initialize VLAs will cause a proper error; avoid tree
5063 checking errors as well by setting a safe value. */
5064 if (constructor_max_index
5065 && TREE_CODE (constructor_max_index
) != INTEGER_CST
)
5066 constructor_max_index
= build_int_cst (NULL_TREE
, -1);
5069 = convert (bitsizetype
,
5070 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type
)));
5074 constructor_index
= bitsize_zero_node
;
5075 constructor_max_index
= NULL_TREE
;
5078 constructor_unfilled_index
= constructor_index
;
5080 else if (TREE_CODE (constructor_type
) == VECTOR_TYPE
)
5082 /* Vectors are like simple fixed-size arrays. */
5083 constructor_max_index
=
5084 build_int_cst (NULL_TREE
, TYPE_VECTOR_SUBPARTS (constructor_type
) - 1);
5085 constructor_index
= convert (bitsizetype
, bitsize_zero_node
);
5086 constructor_unfilled_index
= constructor_index
;
5090 /* Handle the case of int x = {5}; */
5091 constructor_fields
= constructor_type
;
5092 constructor_unfilled_fields
= constructor_type
;
5096 /* Push down into a subobject, for initialization.
5097 If this is for an explicit set of braces, IMPLICIT is 0.
5098 If it is because the next element belongs at a lower level,
5099 IMPLICIT is 1 (or 2 if the push is because of designator list). */
5102 push_init_level (int implicit
)
5104 struct constructor_stack
*p
;
5105 tree value
= NULL_TREE
;
5107 /* If we've exhausted any levels that didn't have braces,
5108 pop them now. If implicit == 1, this will have been done in
5109 process_init_element; do not repeat it here because in the case
5110 of excess initializers for an empty aggregate this leads to an
5111 infinite cycle of popping a level and immediately recreating
5115 while (constructor_stack
->implicit
)
5117 if ((TREE_CODE (constructor_type
) == RECORD_TYPE
5118 || TREE_CODE (constructor_type
) == UNION_TYPE
)
5119 && constructor_fields
== 0)
5120 process_init_element (pop_init_level (1));
5121 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
5122 && constructor_max_index
5123 && tree_int_cst_lt (constructor_max_index
,
5125 process_init_element (pop_init_level (1));
5131 /* Unless this is an explicit brace, we need to preserve previous
5135 if ((TREE_CODE (constructor_type
) == RECORD_TYPE
5136 || TREE_CODE (constructor_type
) == UNION_TYPE
)
5137 && constructor_fields
)
5138 value
= find_init_member (constructor_fields
);
5139 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5140 value
= find_init_member (constructor_index
);
5143 p
= XNEW (struct constructor_stack
);
5144 p
->type
= constructor_type
;
5145 p
->fields
= constructor_fields
;
5146 p
->index
= constructor_index
;
5147 p
->max_index
= constructor_max_index
;
5148 p
->unfilled_index
= constructor_unfilled_index
;
5149 p
->unfilled_fields
= constructor_unfilled_fields
;
5150 p
->bit_index
= constructor_bit_index
;
5151 p
->elements
= constructor_elements
;
5152 p
->constant
= constructor_constant
;
5153 p
->simple
= constructor_simple
;
5154 p
->erroneous
= constructor_erroneous
;
5155 p
->pending_elts
= constructor_pending_elts
;
5156 p
->depth
= constructor_depth
;
5157 p
->replacement_value
.value
= 0;
5158 p
->replacement_value
.original_code
= ERROR_MARK
;
5159 p
->implicit
= implicit
;
5161 p
->incremental
= constructor_incremental
;
5162 p
->designated
= constructor_designated
;
5163 p
->next
= constructor_stack
;
5165 constructor_stack
= p
;
5167 constructor_constant
= 1;
5168 constructor_simple
= 1;
5169 constructor_depth
= SPELLING_DEPTH ();
5170 constructor_elements
= 0;
5171 constructor_incremental
= 1;
5172 constructor_designated
= 0;
5173 constructor_pending_elts
= 0;
5176 p
->range_stack
= constructor_range_stack
;
5177 constructor_range_stack
= 0;
5178 designator_depth
= 0;
5179 designator_erroneous
= 0;
5182 /* Don't die if an entire brace-pair level is superfluous
5183 in the containing level. */
5184 if (constructor_type
== 0)
5186 else if (TREE_CODE (constructor_type
) == RECORD_TYPE
5187 || TREE_CODE (constructor_type
) == UNION_TYPE
)
5189 /* Don't die if there are extra init elts at the end. */
5190 if (constructor_fields
== 0)
5191 constructor_type
= 0;
5194 constructor_type
= TREE_TYPE (constructor_fields
);
5195 push_member_name (constructor_fields
);
5196 constructor_depth
++;
5199 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5201 constructor_type
= TREE_TYPE (constructor_type
);
5202 push_array_bounds (tree_low_cst (constructor_index
, 0));
5203 constructor_depth
++;
5206 if (constructor_type
== 0)
5208 error_init ("extra brace group at end of initializer");
5209 constructor_fields
= 0;
5210 constructor_unfilled_fields
= 0;
5214 if (value
&& TREE_CODE (value
) == CONSTRUCTOR
)
5216 constructor_constant
= TREE_CONSTANT (value
);
5217 constructor_simple
= TREE_STATIC (value
);
5218 constructor_elements
= CONSTRUCTOR_ELTS (value
);
5219 if (!VEC_empty (constructor_elt
, constructor_elements
)
5220 && (TREE_CODE (constructor_type
) == RECORD_TYPE
5221 || TREE_CODE (constructor_type
) == ARRAY_TYPE
))
5222 set_nonincremental_init ();
5225 if (implicit
== 1 && warn_missing_braces
&& !missing_braces_mentioned
)
5227 missing_braces_mentioned
= 1;
5228 warning_init ("missing braces around initializer");
5231 if (TREE_CODE (constructor_type
) == RECORD_TYPE
5232 || TREE_CODE (constructor_type
) == UNION_TYPE
)
5234 constructor_fields
= TYPE_FIELDS (constructor_type
);
5235 /* Skip any nameless bit fields at the beginning. */
5236 while (constructor_fields
!= 0 && DECL_C_BIT_FIELD (constructor_fields
)
5237 && DECL_NAME (constructor_fields
) == 0)
5238 constructor_fields
= TREE_CHAIN (constructor_fields
);
5240 constructor_unfilled_fields
= constructor_fields
;
5241 constructor_bit_index
= bitsize_zero_node
;
5243 else if (TREE_CODE (constructor_type
) == VECTOR_TYPE
)
5245 /* Vectors are like simple fixed-size arrays. */
5246 constructor_max_index
=
5247 build_int_cst (NULL_TREE
, TYPE_VECTOR_SUBPARTS (constructor_type
) - 1);
5248 constructor_index
= convert (bitsizetype
, integer_zero_node
);
5249 constructor_unfilled_index
= constructor_index
;
5251 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5253 if (TYPE_DOMAIN (constructor_type
))
5255 constructor_max_index
5256 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type
));
5258 /* Detect non-empty initializations of zero-length arrays. */
5259 if (constructor_max_index
== NULL_TREE
5260 && TYPE_SIZE (constructor_type
))
5261 constructor_max_index
= build_int_cst (NULL_TREE
, -1);
5263 /* constructor_max_index needs to be an INTEGER_CST. Attempts
5264 to initialize VLAs will cause a proper error; avoid tree
5265 checking errors as well by setting a safe value. */
5266 if (constructor_max_index
5267 && TREE_CODE (constructor_max_index
) != INTEGER_CST
)
5268 constructor_max_index
= build_int_cst (NULL_TREE
, -1);
5271 = convert (bitsizetype
,
5272 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type
)));
5275 constructor_index
= bitsize_zero_node
;
5277 constructor_unfilled_index
= constructor_index
;
5278 if (value
&& TREE_CODE (value
) == STRING_CST
)
5280 /* We need to split the char/wchar array into individual
5281 characters, so that we don't have to special case it
5283 set_nonincremental_init_from_string (value
);
5288 if (constructor_type
!= error_mark_node
)
5289 warning_init ("braces around scalar initializer");
5290 constructor_fields
= constructor_type
;
5291 constructor_unfilled_fields
= constructor_type
;
5295 /* At the end of an implicit or explicit brace level,
5296 finish up that level of constructor. If a single expression
5297 with redundant braces initialized that level, return the
5298 c_expr structure for that expression. Otherwise, the original_code
5299 element is set to ERROR_MARK.
5300 If we were outputting the elements as they are read, return 0 as the value
5301 from inner levels (process_init_element ignores that),
5302 but return error_mark_node as the value from the outermost level
5303 (that's what we want to put in DECL_INITIAL).
5304 Otherwise, return a CONSTRUCTOR expression as the value. */
5307 pop_init_level (int implicit
)
5309 struct constructor_stack
*p
;
5312 ret
.original_code
= ERROR_MARK
;
5316 /* When we come to an explicit close brace,
5317 pop any inner levels that didn't have explicit braces. */
5318 while (constructor_stack
->implicit
)
5319 process_init_element (pop_init_level (1));
5321 gcc_assert (!constructor_range_stack
);
5324 /* Now output all pending elements. */
5325 constructor_incremental
= 1;
5326 output_pending_init_elements (1);
5328 p
= constructor_stack
;
5330 /* Error for initializing a flexible array member, or a zero-length
5331 array member in an inappropriate context. */
5332 if (constructor_type
&& constructor_fields
5333 && TREE_CODE (constructor_type
) == ARRAY_TYPE
5334 && TYPE_DOMAIN (constructor_type
)
5335 && !TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type
)))
5337 /* Silently discard empty initializations. The parser will
5338 already have pedwarned for empty brackets. */
5339 if (integer_zerop (constructor_unfilled_index
))
5340 constructor_type
= NULL_TREE
;
5343 gcc_assert (!TYPE_SIZE (constructor_type
));
5345 if (constructor_depth
> 2)
5346 error_init ("initialization of flexible array member in a nested context");
5348 pedwarn_init ("initialization of a flexible array member");
5350 /* We have already issued an error message for the existence
5351 of a flexible array member not at the end of the structure.
5352 Discard the initializer so that we do not die later. */
5353 if (TREE_CHAIN (constructor_fields
) != NULL_TREE
)
5354 constructor_type
= NULL_TREE
;
5358 /* Warn when some struct elements are implicitly initialized to zero. */
5359 if (warn_missing_field_initializers
5361 && TREE_CODE (constructor_type
) == RECORD_TYPE
5362 && constructor_unfilled_fields
)
5364 /* Do not warn for flexible array members or zero-length arrays. */
5365 while (constructor_unfilled_fields
5366 && (!DECL_SIZE (constructor_unfilled_fields
)
5367 || integer_zerop (DECL_SIZE (constructor_unfilled_fields
))))
5368 constructor_unfilled_fields
= TREE_CHAIN (constructor_unfilled_fields
);
5370 /* Do not warn if this level of the initializer uses member
5371 designators; it is likely to be deliberate. */
5372 if (constructor_unfilled_fields
&& !constructor_designated
)
5374 push_member_name (constructor_unfilled_fields
);
5375 warning_init ("missing initializer");
5376 RESTORE_SPELLING_DEPTH (constructor_depth
);
5380 /* Pad out the end of the structure. */
5381 if (p
->replacement_value
.value
)
5382 /* If this closes a superfluous brace pair,
5383 just pass out the element between them. */
5384 ret
= p
->replacement_value
;
5385 else if (constructor_type
== 0)
5387 else if (TREE_CODE (constructor_type
) != RECORD_TYPE
5388 && TREE_CODE (constructor_type
) != UNION_TYPE
5389 && TREE_CODE (constructor_type
) != ARRAY_TYPE
5390 && TREE_CODE (constructor_type
) != VECTOR_TYPE
)
5392 /* A nonincremental scalar initializer--just return
5393 the element, after verifying there is just one. */
5394 if (VEC_empty (constructor_elt
,constructor_elements
))
5396 if (!constructor_erroneous
)
5397 error_init ("empty scalar initializer");
5398 ret
.value
= error_mark_node
;
5400 else if (VEC_length (constructor_elt
,constructor_elements
) != 1)
5402 error_init ("extra elements in scalar initializer");
5403 ret
.value
= VEC_index (constructor_elt
,constructor_elements
,0)->value
;
5406 ret
.value
= VEC_index (constructor_elt
,constructor_elements
,0)->value
;
5410 if (constructor_erroneous
)
5411 ret
.value
= error_mark_node
;
5414 ret
.value
= build_constructor (constructor_type
,
5415 constructor_elements
);
5416 if (constructor_constant
)
5417 TREE_CONSTANT (ret
.value
) = TREE_INVARIANT (ret
.value
) = 1;
5418 if (constructor_constant
&& constructor_simple
)
5419 TREE_STATIC (ret
.value
) = 1;
5423 constructor_type
= p
->type
;
5424 constructor_fields
= p
->fields
;
5425 constructor_index
= p
->index
;
5426 constructor_max_index
= p
->max_index
;
5427 constructor_unfilled_index
= p
->unfilled_index
;
5428 constructor_unfilled_fields
= p
->unfilled_fields
;
5429 constructor_bit_index
= p
->bit_index
;
5430 constructor_elements
= p
->elements
;
5431 constructor_constant
= p
->constant
;
5432 constructor_simple
= p
->simple
;
5433 constructor_erroneous
= p
->erroneous
;
5434 constructor_incremental
= p
->incremental
;
5435 constructor_designated
= p
->designated
;
5436 constructor_pending_elts
= p
->pending_elts
;
5437 constructor_depth
= p
->depth
;
5439 constructor_range_stack
= p
->range_stack
;
5440 RESTORE_SPELLING_DEPTH (constructor_depth
);
5442 constructor_stack
= p
->next
;
5447 if (constructor_stack
== 0)
5449 ret
.value
= error_mark_node
;
5457 /* Common handling for both array range and field name designators.
5458 ARRAY argument is nonzero for array ranges. Returns zero for success. */
5461 set_designator (int array
)
5464 enum tree_code subcode
;
5466 /* Don't die if an entire brace-pair level is superfluous
5467 in the containing level. */
5468 if (constructor_type
== 0)
5471 /* If there were errors in this designator list already, bail out
5473 if (designator_erroneous
)
5476 if (!designator_depth
)
5478 gcc_assert (!constructor_range_stack
);
5480 /* Designator list starts at the level of closest explicit
5482 while (constructor_stack
->implicit
)
5483 process_init_element (pop_init_level (1));
5484 constructor_designated
= 1;
5488 switch (TREE_CODE (constructor_type
))
5492 subtype
= TREE_TYPE (constructor_fields
);
5493 if (subtype
!= error_mark_node
)
5494 subtype
= TYPE_MAIN_VARIANT (subtype
);
5497 subtype
= TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type
));
5503 subcode
= TREE_CODE (subtype
);
5504 if (array
&& subcode
!= ARRAY_TYPE
)
5506 error_init ("array index in non-array initializer");
5509 else if (!array
&& subcode
!= RECORD_TYPE
&& subcode
!= UNION_TYPE
)
5511 error_init ("field name not in record or union initializer");
5515 constructor_designated
= 1;
5516 push_init_level (2);
5520 /* If there are range designators in designator list, push a new designator
5521 to constructor_range_stack. RANGE_END is end of such stack range or
5522 NULL_TREE if there is no range designator at this level. */
5525 push_range_stack (tree range_end
)
5527 struct constructor_range_stack
*p
;
5529 p
= GGC_NEW (struct constructor_range_stack
);
5530 p
->prev
= constructor_range_stack
;
5532 p
->fields
= constructor_fields
;
5533 p
->range_start
= constructor_index
;
5534 p
->index
= constructor_index
;
5535 p
->stack
= constructor_stack
;
5536 p
->range_end
= range_end
;
5537 if (constructor_range_stack
)
5538 constructor_range_stack
->next
= p
;
5539 constructor_range_stack
= p
;
5542 /* Within an array initializer, specify the next index to be initialized.
5543 FIRST is that index. If LAST is nonzero, then initialize a range
5544 of indices, running from FIRST through LAST. */
5547 set_init_index (tree first
, tree last
)
5549 if (set_designator (1))
5552 designator_erroneous
= 1;
5554 if (!INTEGRAL_TYPE_P (TREE_TYPE (first
))
5555 || (last
&& !INTEGRAL_TYPE_P (TREE_TYPE (last
))))
5557 error_init ("array index in initializer not of integer type");
5561 if (TREE_CODE (first
) != INTEGER_CST
)
5562 error_init ("nonconstant array index in initializer");
5563 else if (last
!= 0 && TREE_CODE (last
) != INTEGER_CST
)
5564 error_init ("nonconstant array index in initializer");
5565 else if (TREE_CODE (constructor_type
) != ARRAY_TYPE
)
5566 error_init ("array index in non-array initializer");
5567 else if (tree_int_cst_sgn (first
) == -1)
5568 error_init ("array index in initializer exceeds array bounds");
5569 else if (constructor_max_index
5570 && tree_int_cst_lt (constructor_max_index
, first
))
5571 error_init ("array index in initializer exceeds array bounds");
5574 constructor_index
= convert (bitsizetype
, first
);
5578 if (tree_int_cst_equal (first
, last
))
5580 else if (tree_int_cst_lt (last
, first
))
5582 error_init ("empty index range in initializer");
5587 last
= convert (bitsizetype
, last
);
5588 if (constructor_max_index
!= 0
5589 && tree_int_cst_lt (constructor_max_index
, last
))
5591 error_init ("array index range in initializer exceeds array bounds");
5598 designator_erroneous
= 0;
5599 if (constructor_range_stack
|| last
)
5600 push_range_stack (last
);
5604 /* Within a struct initializer, specify the next field to be initialized. */
5607 set_init_label (tree fieldname
)
5611 if (set_designator (0))
5614 designator_erroneous
= 1;
5616 if (TREE_CODE (constructor_type
) != RECORD_TYPE
5617 && TREE_CODE (constructor_type
) != UNION_TYPE
)
5619 error_init ("field name not in record or union initializer");
5623 for (tail
= TYPE_FIELDS (constructor_type
); tail
;
5624 tail
= TREE_CHAIN (tail
))
5626 if (DECL_NAME (tail
) == fieldname
)
5631 error ("unknown field %qE specified in initializer", fieldname
);
5634 constructor_fields
= tail
;
5636 designator_erroneous
= 0;
5637 if (constructor_range_stack
)
5638 push_range_stack (NULL_TREE
);
5642 /* Add a new initializer to the tree of pending initializers. PURPOSE
5643 identifies the initializer, either array index or field in a structure.
5644 VALUE is the value of that index or field. */
5647 add_pending_init (tree purpose
, tree value
)
5649 struct init_node
*p
, **q
, *r
;
5651 q
= &constructor_pending_elts
;
5654 if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5659 if (tree_int_cst_lt (purpose
, p
->purpose
))
5661 else if (tree_int_cst_lt (p
->purpose
, purpose
))
5665 if (TREE_SIDE_EFFECTS (p
->value
))
5666 warning_init ("initialized field with side-effects overwritten");
5676 bitpos
= bit_position (purpose
);
5680 if (tree_int_cst_lt (bitpos
, bit_position (p
->purpose
)))
5682 else if (p
->purpose
!= purpose
)
5686 if (TREE_SIDE_EFFECTS (p
->value
))
5687 warning_init ("initialized field with side-effects overwritten");
5694 r
= GGC_NEW (struct init_node
);
5695 r
->purpose
= purpose
;
5706 struct init_node
*s
;
5710 if (p
->balance
== 0)
5712 else if (p
->balance
< 0)
5719 p
->left
->parent
= p
;
5736 constructor_pending_elts
= r
;
5741 struct init_node
*t
= r
->right
;
5745 r
->right
->parent
= r
;
5750 p
->left
->parent
= p
;
5753 p
->balance
= t
->balance
< 0;
5754 r
->balance
= -(t
->balance
> 0);
5769 constructor_pending_elts
= t
;
5775 /* p->balance == +1; growth of left side balances the node. */
5780 else /* r == p->right */
5782 if (p
->balance
== 0)
5783 /* Growth propagation from right side. */
5785 else if (p
->balance
> 0)
5792 p
->right
->parent
= p
;
5809 constructor_pending_elts
= r
;
5811 else /* r->balance == -1 */
5814 struct init_node
*t
= r
->left
;
5818 r
->left
->parent
= r
;
5823 p
->right
->parent
= p
;
5826 r
->balance
= (t
->balance
< 0);
5827 p
->balance
= -(t
->balance
> 0);
5842 constructor_pending_elts
= t
;
5848 /* p->balance == -1; growth of right side balances the node. */
5859 /* Build AVL tree from a sorted chain. */
5862 set_nonincremental_init (void)
5864 unsigned HOST_WIDE_INT ix
;
5867 if (TREE_CODE (constructor_type
) != RECORD_TYPE
5868 && TREE_CODE (constructor_type
) != ARRAY_TYPE
)
5871 FOR_EACH_CONSTRUCTOR_ELT (constructor_elements
, ix
, index
, value
)
5872 add_pending_init (index
, value
);
5873 constructor_elements
= 0;
5874 if (TREE_CODE (constructor_type
) == RECORD_TYPE
)
5876 constructor_unfilled_fields
= TYPE_FIELDS (constructor_type
);
5877 /* Skip any nameless bit fields at the beginning. */
5878 while (constructor_unfilled_fields
!= 0
5879 && DECL_C_BIT_FIELD (constructor_unfilled_fields
)
5880 && DECL_NAME (constructor_unfilled_fields
) == 0)
5881 constructor_unfilled_fields
= TREE_CHAIN (constructor_unfilled_fields
);
5884 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5886 if (TYPE_DOMAIN (constructor_type
))
5887 constructor_unfilled_index
5888 = convert (bitsizetype
,
5889 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type
)));
5891 constructor_unfilled_index
= bitsize_zero_node
;
5893 constructor_incremental
= 0;
5896 /* Build AVL tree from a string constant. */
5899 set_nonincremental_init_from_string (tree str
)
5901 tree value
, purpose
, type
;
5902 HOST_WIDE_INT val
[2];
5903 const char *p
, *end
;
5904 int byte
, wchar_bytes
, charwidth
, bitpos
;
5906 gcc_assert (TREE_CODE (constructor_type
) == ARRAY_TYPE
);
5908 if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str
)))
5909 == TYPE_PRECISION (char_type_node
))
5913 gcc_assert (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str
)))
5914 == TYPE_PRECISION (wchar_type_node
));
5915 wchar_bytes
= TYPE_PRECISION (wchar_type_node
) / BITS_PER_UNIT
;
5917 charwidth
= TYPE_PRECISION (char_type_node
);
5918 type
= TREE_TYPE (constructor_type
);
5919 p
= TREE_STRING_POINTER (str
);
5920 end
= p
+ TREE_STRING_LENGTH (str
);
5922 for (purpose
= bitsize_zero_node
;
5923 p
< end
&& !tree_int_cst_lt (constructor_max_index
, purpose
);
5924 purpose
= size_binop (PLUS_EXPR
, purpose
, bitsize_one_node
))
5926 if (wchar_bytes
== 1)
5928 val
[1] = (unsigned char) *p
++;
5935 for (byte
= 0; byte
< wchar_bytes
; byte
++)
5937 if (BYTES_BIG_ENDIAN
)
5938 bitpos
= (wchar_bytes
- byte
- 1) * charwidth
;
5940 bitpos
= byte
* charwidth
;
5941 val
[bitpos
< HOST_BITS_PER_WIDE_INT
]
5942 |= ((unsigned HOST_WIDE_INT
) ((unsigned char) *p
++))
5943 << (bitpos
% HOST_BITS_PER_WIDE_INT
);
5947 if (!TYPE_UNSIGNED (type
))
5949 bitpos
= ((wchar_bytes
- 1) * charwidth
) + HOST_BITS_PER_CHAR
;
5950 if (bitpos
< HOST_BITS_PER_WIDE_INT
)
5952 if (val
[1] & (((HOST_WIDE_INT
) 1) << (bitpos
- 1)))
5954 val
[1] |= ((HOST_WIDE_INT
) -1) << bitpos
;
5958 else if (bitpos
== HOST_BITS_PER_WIDE_INT
)
5963 else if (val
[0] & (((HOST_WIDE_INT
) 1)
5964 << (bitpos
- 1 - HOST_BITS_PER_WIDE_INT
)))
5965 val
[0] |= ((HOST_WIDE_INT
) -1)
5966 << (bitpos
- HOST_BITS_PER_WIDE_INT
);
5969 value
= build_int_cst_wide (type
, val
[1], val
[0]);
5970 add_pending_init (purpose
, value
);
5973 constructor_incremental
= 0;
5976 /* Return value of FIELD in pending initializer or zero if the field was
5977 not initialized yet. */
5980 find_init_member (tree field
)
5982 struct init_node
*p
;
5984 if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
5986 if (constructor_incremental
5987 && tree_int_cst_lt (field
, constructor_unfilled_index
))
5988 set_nonincremental_init ();
5990 p
= constructor_pending_elts
;
5993 if (tree_int_cst_lt (field
, p
->purpose
))
5995 else if (tree_int_cst_lt (p
->purpose
, field
))
6001 else if (TREE_CODE (constructor_type
) == RECORD_TYPE
)
6003 tree bitpos
= bit_position (field
);
6005 if (constructor_incremental
6006 && (!constructor_unfilled_fields
6007 || tree_int_cst_lt (bitpos
,
6008 bit_position (constructor_unfilled_fields
))))
6009 set_nonincremental_init ();
6011 p
= constructor_pending_elts
;
6014 if (field
== p
->purpose
)
6016 else if (tree_int_cst_lt (bitpos
, bit_position (p
->purpose
)))
6022 else if (TREE_CODE (constructor_type
) == UNION_TYPE
)
6024 if (!VEC_empty (constructor_elt
, constructor_elements
)
6025 && (VEC_last (constructor_elt
, constructor_elements
)->index
6027 return VEC_last (constructor_elt
, constructor_elements
)->value
;
6032 /* "Output" the next constructor element.
6033 At top level, really output it to assembler code now.
6034 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
6035 TYPE is the data type that the containing data type wants here.
6036 FIELD is the field (a FIELD_DECL) or the index that this element fills.
6037 If VALUE is a string constant, STRICT_STRING is true if it is
6038 unparenthesized or we should not warn here for it being parenthesized.
6039 For other types of VALUE, STRICT_STRING is not used.
6041 PENDING if non-nil means output pending elements that belong
6042 right after this element. (PENDING is normally 1;
6043 it is 0 while outputting pending elements, to avoid recursion.) */
6046 output_init_element (tree value
, bool strict_string
, tree type
, tree field
,
6049 constructor_elt
*celt
;
6051 if (type
== error_mark_node
|| value
== error_mark_node
)
6053 constructor_erroneous
= 1;
6056 if (TREE_CODE (TREE_TYPE (value
)) == ARRAY_TYPE
6057 && (TREE_CODE (value
) == STRING_CST
6058 || TREE_CODE (value
) == COMPOUND_LITERAL_EXPR
)
6059 && !(TREE_CODE (value
) == STRING_CST
6060 && TREE_CODE (type
) == ARRAY_TYPE
6061 && INTEGRAL_TYPE_P (TREE_TYPE (type
)))
6062 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value
)),
6063 TYPE_MAIN_VARIANT (type
)))
6064 value
= array_to_pointer_conversion (value
);
6066 if (TREE_CODE (value
) == COMPOUND_LITERAL_EXPR
6067 && require_constant_value
&& !flag_isoc99
&& pending
)
6069 /* As an extension, allow initializing objects with static storage
6070 duration with compound literals (which are then treated just as
6071 the brace enclosed list they contain). */
6072 tree decl
= COMPOUND_LITERAL_EXPR_DECL (value
);
6073 value
= DECL_INITIAL (decl
);
6076 if (value
== error_mark_node
)
6077 constructor_erroneous
= 1;
6078 else if (!TREE_CONSTANT (value
))
6079 constructor_constant
= 0;
6080 else if (!initializer_constant_valid_p (value
, TREE_TYPE (value
))
6081 || ((TREE_CODE (constructor_type
) == RECORD_TYPE
6082 || TREE_CODE (constructor_type
) == UNION_TYPE
)
6083 && DECL_C_BIT_FIELD (field
)
6084 && TREE_CODE (value
) != INTEGER_CST
))
6085 constructor_simple
= 0;
6087 if (!initializer_constant_valid_p (value
, TREE_TYPE (value
)))
6089 if (require_constant_value
)
6091 error_init ("initializer element is not constant");
6092 value
= error_mark_node
;
6094 else if (require_constant_elements
)
6095 pedwarn ("initializer element is not computable at load time");
6098 /* If this field is empty (and not at the end of structure),
6099 don't do anything other than checking the initializer. */
6101 && (TREE_TYPE (field
) == error_mark_node
6102 || (COMPLETE_TYPE_P (TREE_TYPE (field
))
6103 && integer_zerop (TYPE_SIZE (TREE_TYPE (field
)))
6104 && (TREE_CODE (constructor_type
) == ARRAY_TYPE
6105 || TREE_CHAIN (field
)))))
6108 value
= digest_init (type
, value
, strict_string
, require_constant_value
);
6109 if (value
== error_mark_node
)
6111 constructor_erroneous
= 1;
6115 /* If this element doesn't come next in sequence,
6116 put it on constructor_pending_elts. */
6117 if (TREE_CODE (constructor_type
) == ARRAY_TYPE
6118 && (!constructor_incremental
6119 || !tree_int_cst_equal (field
, constructor_unfilled_index
)))
6121 if (constructor_incremental
6122 && tree_int_cst_lt (field
, constructor_unfilled_index
))
6123 set_nonincremental_init ();
6125 add_pending_init (field
, value
);
6128 else if (TREE_CODE (constructor_type
) == RECORD_TYPE
6129 && (!constructor_incremental
6130 || field
!= constructor_unfilled_fields
))
6132 /* We do this for records but not for unions. In a union,
6133 no matter which field is specified, it can be initialized
6134 right away since it starts at the beginning of the union. */
6135 if (constructor_incremental
)
6137 if (!constructor_unfilled_fields
)
6138 set_nonincremental_init ();
6141 tree bitpos
, unfillpos
;
6143 bitpos
= bit_position (field
);
6144 unfillpos
= bit_position (constructor_unfilled_fields
);
6146 if (tree_int_cst_lt (bitpos
, unfillpos
))
6147 set_nonincremental_init ();
6151 add_pending_init (field
, value
);
6154 else if (TREE_CODE (constructor_type
) == UNION_TYPE
6155 && !VEC_empty (constructor_elt
, constructor_elements
))
6157 if (TREE_SIDE_EFFECTS (VEC_last (constructor_elt
,
6158 constructor_elements
)->value
))
6159 warning_init ("initialized field with side-effects overwritten");
6161 /* We can have just one union field set. */
6162 constructor_elements
= 0;
6165 /* Otherwise, output this element either to
6166 constructor_elements or to the assembler file. */
6168 celt
= VEC_safe_push (constructor_elt
, gc
, constructor_elements
, NULL
);
6169 celt
->index
= field
;
6170 celt
->value
= value
;
6172 /* Advance the variable that indicates sequential elements output. */
6173 if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
6174 constructor_unfilled_index
6175 = size_binop (PLUS_EXPR
, constructor_unfilled_index
,
6177 else if (TREE_CODE (constructor_type
) == RECORD_TYPE
)
6179 constructor_unfilled_fields
6180 = TREE_CHAIN (constructor_unfilled_fields
);
6182 /* Skip any nameless bit fields. */
6183 while (constructor_unfilled_fields
!= 0
6184 && DECL_C_BIT_FIELD (constructor_unfilled_fields
)
6185 && DECL_NAME (constructor_unfilled_fields
) == 0)
6186 constructor_unfilled_fields
=
6187 TREE_CHAIN (constructor_unfilled_fields
);
6189 else if (TREE_CODE (constructor_type
) == UNION_TYPE
)
6190 constructor_unfilled_fields
= 0;
6192 /* Now output any pending elements which have become next. */
6194 output_pending_init_elements (0);
6197 /* Output any pending elements which have become next.
6198 As we output elements, constructor_unfilled_{fields,index}
6199 advances, which may cause other elements to become next;
6200 if so, they too are output.
6202 If ALL is 0, we return when there are
6203 no more pending elements to output now.
6205 If ALL is 1, we output space as necessary so that
6206 we can output all the pending elements. */
6209 output_pending_init_elements (int all
)
6211 struct init_node
*elt
= constructor_pending_elts
;
6216 /* Look through the whole pending tree.
6217 If we find an element that should be output now,
6218 output it. Otherwise, set NEXT to the element
6219 that comes first among those still pending. */
6224 if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
6226 if (tree_int_cst_equal (elt
->purpose
,
6227 constructor_unfilled_index
))
6228 output_init_element (elt
->value
, true,
6229 TREE_TYPE (constructor_type
),
6230 constructor_unfilled_index
, 0);
6231 else if (tree_int_cst_lt (constructor_unfilled_index
,
6234 /* Advance to the next smaller node. */
6239 /* We have reached the smallest node bigger than the
6240 current unfilled index. Fill the space first. */
6241 next
= elt
->purpose
;
6247 /* Advance to the next bigger node. */
6252 /* We have reached the biggest node in a subtree. Find
6253 the parent of it, which is the next bigger node. */
6254 while (elt
->parent
&& elt
->parent
->right
== elt
)
6257 if (elt
&& tree_int_cst_lt (constructor_unfilled_index
,
6260 next
= elt
->purpose
;
6266 else if (TREE_CODE (constructor_type
) == RECORD_TYPE
6267 || TREE_CODE (constructor_type
) == UNION_TYPE
)
6269 tree ctor_unfilled_bitpos
, elt_bitpos
;
6271 /* If the current record is complete we are done. */
6272 if (constructor_unfilled_fields
== 0)
6275 ctor_unfilled_bitpos
= bit_position (constructor_unfilled_fields
);
6276 elt_bitpos
= bit_position (elt
->purpose
);
6277 /* We can't compare fields here because there might be empty
6278 fields in between. */
6279 if (tree_int_cst_equal (elt_bitpos
, ctor_unfilled_bitpos
))
6281 constructor_unfilled_fields
= elt
->purpose
;
6282 output_init_element (elt
->value
, true, TREE_TYPE (elt
->purpose
),
6285 else if (tree_int_cst_lt (ctor_unfilled_bitpos
, elt_bitpos
))
6287 /* Advance to the next smaller node. */
6292 /* We have reached the smallest node bigger than the
6293 current unfilled field. Fill the space first. */
6294 next
= elt
->purpose
;
6300 /* Advance to the next bigger node. */
6305 /* We have reached the biggest node in a subtree. Find
6306 the parent of it, which is the next bigger node. */
6307 while (elt
->parent
&& elt
->parent
->right
== elt
)
6311 && (tree_int_cst_lt (ctor_unfilled_bitpos
,
6312 bit_position (elt
->purpose
))))
6314 next
= elt
->purpose
;
6322 /* Ordinarily return, but not if we want to output all
6323 and there are elements left. */
6324 if (!(all
&& next
!= 0))
6327 /* If it's not incremental, just skip over the gap, so that after
6328 jumping to retry we will output the next successive element. */
6329 if (TREE_CODE (constructor_type
) == RECORD_TYPE
6330 || TREE_CODE (constructor_type
) == UNION_TYPE
)
6331 constructor_unfilled_fields
= next
;
6332 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
6333 constructor_unfilled_index
= next
;
6335 /* ELT now points to the node in the pending tree with the next
6336 initializer to output. */
6340 /* Add one non-braced element to the current constructor level.
6341 This adjusts the current position within the constructor's type.
6342 This may also start or terminate implicit levels
6343 to handle a partly-braced initializer.
6345 Once this has found the correct level for the new element,
6346 it calls output_init_element. */
6349 process_init_element (struct c_expr value
)
6351 tree orig_value
= value
.value
;
6352 int string_flag
= orig_value
!= 0 && TREE_CODE (orig_value
) == STRING_CST
;
6353 bool strict_string
= value
.original_code
== STRING_CST
;
6355 designator_depth
= 0;
6356 designator_erroneous
= 0;
6358 /* Handle superfluous braces around string cst as in
6359 char x[] = {"foo"}; */
6362 && TREE_CODE (constructor_type
) == ARRAY_TYPE
6363 && INTEGRAL_TYPE_P (TREE_TYPE (constructor_type
))
6364 && integer_zerop (constructor_unfilled_index
))
6366 if (constructor_stack
->replacement_value
.value
)
6367 error_init ("excess elements in char array initializer");
6368 constructor_stack
->replacement_value
= value
;
6372 if (constructor_stack
->replacement_value
.value
!= 0)
6374 error_init ("excess elements in struct initializer");
6378 /* Ignore elements of a brace group if it is entirely superfluous
6379 and has already been diagnosed. */
6380 if (constructor_type
== 0)
6383 /* If we've exhausted any levels that didn't have braces,
6385 while (constructor_stack
->implicit
)
6387 if ((TREE_CODE (constructor_type
) == RECORD_TYPE
6388 || TREE_CODE (constructor_type
) == UNION_TYPE
)
6389 && constructor_fields
== 0)
6390 process_init_element (pop_init_level (1));
6391 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
6392 && (constructor_max_index
== 0
6393 || tree_int_cst_lt (constructor_max_index
,
6394 constructor_index
)))
6395 process_init_element (pop_init_level (1));
6400 /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
6401 if (constructor_range_stack
)
6403 /* If value is a compound literal and we'll be just using its
6404 content, don't put it into a SAVE_EXPR. */
6405 if (TREE_CODE (value
.value
) != COMPOUND_LITERAL_EXPR
6406 || !require_constant_value
6408 value
.value
= save_expr (value
.value
);
6413 if (TREE_CODE (constructor_type
) == RECORD_TYPE
)
6416 enum tree_code fieldcode
;
6418 if (constructor_fields
== 0)
6420 pedwarn_init ("excess elements in struct initializer");
6424 fieldtype
= TREE_TYPE (constructor_fields
);
6425 if (fieldtype
!= error_mark_node
)
6426 fieldtype
= TYPE_MAIN_VARIANT (fieldtype
);
6427 fieldcode
= TREE_CODE (fieldtype
);
6429 /* Error for non-static initialization of a flexible array member. */
6430 if (fieldcode
== ARRAY_TYPE
6431 && !require_constant_value
6432 && TYPE_SIZE (fieldtype
) == NULL_TREE
6433 && TREE_CHAIN (constructor_fields
) == NULL_TREE
)
6435 error_init ("non-static initialization of a flexible array member");
6439 /* Accept a string constant to initialize a subarray. */
6440 if (value
.value
!= 0
6441 && fieldcode
== ARRAY_TYPE
6442 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype
))
6444 value
.value
= orig_value
;
6445 /* Otherwise, if we have come to a subaggregate,
6446 and we don't have an element of its type, push into it. */
6447 else if (value
.value
!= 0
6448 && value
.value
!= error_mark_node
6449 && TYPE_MAIN_VARIANT (TREE_TYPE (value
.value
)) != fieldtype
6450 && (fieldcode
== RECORD_TYPE
|| fieldcode
== ARRAY_TYPE
6451 || fieldcode
== UNION_TYPE
))
6453 push_init_level (1);
6459 push_member_name (constructor_fields
);
6460 output_init_element (value
.value
, strict_string
,
6461 fieldtype
, constructor_fields
, 1);
6462 RESTORE_SPELLING_DEPTH (constructor_depth
);
6465 /* Do the bookkeeping for an element that was
6466 directly output as a constructor. */
6468 /* For a record, keep track of end position of last field. */
6469 if (DECL_SIZE (constructor_fields
))
6470 constructor_bit_index
6471 = size_binop (PLUS_EXPR
,
6472 bit_position (constructor_fields
),
6473 DECL_SIZE (constructor_fields
));
6475 /* If the current field was the first one not yet written out,
6476 it isn't now, so update. */
6477 if (constructor_unfilled_fields
== constructor_fields
)
6479 constructor_unfilled_fields
= TREE_CHAIN (constructor_fields
);
6480 /* Skip any nameless bit fields. */
6481 while (constructor_unfilled_fields
!= 0
6482 && DECL_C_BIT_FIELD (constructor_unfilled_fields
)
6483 && DECL_NAME (constructor_unfilled_fields
) == 0)
6484 constructor_unfilled_fields
=
6485 TREE_CHAIN (constructor_unfilled_fields
);
6489 constructor_fields
= TREE_CHAIN (constructor_fields
);
6490 /* Skip any nameless bit fields at the beginning. */
6491 while (constructor_fields
!= 0
6492 && DECL_C_BIT_FIELD (constructor_fields
)
6493 && DECL_NAME (constructor_fields
) == 0)
6494 constructor_fields
= TREE_CHAIN (constructor_fields
);
6496 else if (TREE_CODE (constructor_type
) == UNION_TYPE
)
6499 enum tree_code fieldcode
;
6501 if (constructor_fields
== 0)
6503 pedwarn_init ("excess elements in union initializer");
6507 fieldtype
= TREE_TYPE (constructor_fields
);
6508 if (fieldtype
!= error_mark_node
)
6509 fieldtype
= TYPE_MAIN_VARIANT (fieldtype
);
6510 fieldcode
= TREE_CODE (fieldtype
);
6512 /* Warn that traditional C rejects initialization of unions.
6513 We skip the warning if the value is zero. This is done
6514 under the assumption that the zero initializer in user
6515 code appears conditioned on e.g. __STDC__ to avoid
6516 "missing initializer" warnings and relies on default
6517 initialization to zero in the traditional C case.
6518 We also skip the warning if the initializer is designated,
6519 again on the assumption that this must be conditional on
6520 __STDC__ anyway (and we've already complained about the
6521 member-designator already). */
6522 if (!in_system_header
&& !constructor_designated
6523 && !(value
.value
&& (integer_zerop (value
.value
)
6524 || real_zerop (value
.value
))))
6525 warning (OPT_Wtraditional
, "traditional C rejects initialization "
6528 /* Accept a string constant to initialize a subarray. */
6529 if (value
.value
!= 0
6530 && fieldcode
== ARRAY_TYPE
6531 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype
))
6533 value
.value
= orig_value
;
6534 /* Otherwise, if we have come to a subaggregate,
6535 and we don't have an element of its type, push into it. */
6536 else if (value
.value
!= 0
6537 && value
.value
!= error_mark_node
6538 && TYPE_MAIN_VARIANT (TREE_TYPE (value
.value
)) != fieldtype
6539 && (fieldcode
== RECORD_TYPE
|| fieldcode
== ARRAY_TYPE
6540 || fieldcode
== UNION_TYPE
))
6542 push_init_level (1);
6548 push_member_name (constructor_fields
);
6549 output_init_element (value
.value
, strict_string
,
6550 fieldtype
, constructor_fields
, 1);
6551 RESTORE_SPELLING_DEPTH (constructor_depth
);
6554 /* Do the bookkeeping for an element that was
6555 directly output as a constructor. */
6557 constructor_bit_index
= DECL_SIZE (constructor_fields
);
6558 constructor_unfilled_fields
= TREE_CHAIN (constructor_fields
);
6561 constructor_fields
= 0;
6563 else if (TREE_CODE (constructor_type
) == ARRAY_TYPE
)
6565 tree elttype
= TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type
));
6566 enum tree_code eltcode
= TREE_CODE (elttype
);
6568 /* Accept a string constant to initialize a subarray. */
6569 if (value
.value
!= 0
6570 && eltcode
== ARRAY_TYPE
6571 && INTEGRAL_TYPE_P (TREE_TYPE (elttype
))
6573 value
.value
= orig_value
;
6574 /* Otherwise, if we have come to a subaggregate,
6575 and we don't have an element of its type, push into it. */
6576 else if (value
.value
!= 0
6577 && value
.value
!= error_mark_node
6578 && TYPE_MAIN_VARIANT (TREE_TYPE (value
.value
)) != elttype
6579 && (eltcode
== RECORD_TYPE
|| eltcode
== ARRAY_TYPE
6580 || eltcode
== UNION_TYPE
))
6582 push_init_level (1);
6586 if (constructor_max_index
!= 0
6587 && (tree_int_cst_lt (constructor_max_index
, constructor_index
)
6588 || integer_all_onesp (constructor_max_index
)))
6590 pedwarn_init ("excess elements in array initializer");
6594 /* Now output the actual element. */
6597 push_array_bounds (tree_low_cst (constructor_index
, 0));
6598 output_init_element (value
.value
, strict_string
,
6599 elttype
, constructor_index
, 1);
6600 RESTORE_SPELLING_DEPTH (constructor_depth
);
6604 = size_binop (PLUS_EXPR
, constructor_index
, bitsize_one_node
);
6607 /* If we are doing the bookkeeping for an element that was
6608 directly output as a constructor, we must update
6609 constructor_unfilled_index. */
6610 constructor_unfilled_index
= constructor_index
;
6612 else if (TREE_CODE (constructor_type
) == VECTOR_TYPE
)
6614 tree elttype
= TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type
));
6616 /* Do a basic check of initializer size. Note that vectors
6617 always have a fixed size derived from their type. */
6618 if (tree_int_cst_lt (constructor_max_index
, constructor_index
))
6620 pedwarn_init ("excess elements in vector initializer");
6624 /* Now output the actual element. */
6626 output_init_element (value
.value
, strict_string
,
6627 elttype
, constructor_index
, 1);
6630 = size_binop (PLUS_EXPR
, constructor_index
, bitsize_one_node
);
6633 /* If we are doing the bookkeeping for an element that was
6634 directly output as a constructor, we must update
6635 constructor_unfilled_index. */
6636 constructor_unfilled_index
= constructor_index
;
6639 /* Handle the sole element allowed in a braced initializer
6640 for a scalar variable. */
6641 else if (constructor_type
!= error_mark_node
6642 && constructor_fields
== 0)
6644 pedwarn_init ("excess elements in scalar initializer");
6650 output_init_element (value
.value
, strict_string
,
6651 constructor_type
, NULL_TREE
, 1);
6652 constructor_fields
= 0;
6655 /* Handle range initializers either at this level or anywhere higher
6656 in the designator stack. */
6657 if (constructor_range_stack
)
6659 struct constructor_range_stack
*p
, *range_stack
;
6662 range_stack
= constructor_range_stack
;
6663 constructor_range_stack
= 0;
6664 while (constructor_stack
!= range_stack
->stack
)
6666 gcc_assert (constructor_stack
->implicit
);
6667 process_init_element (pop_init_level (1));
6669 for (p
= range_stack
;
6670 !p
->range_end
|| tree_int_cst_equal (p
->index
, p
->range_end
);
6673 gcc_assert (constructor_stack
->implicit
);
6674 process_init_element (pop_init_level (1));
6677 p
->index
= size_binop (PLUS_EXPR
, p
->index
, bitsize_one_node
);
6678 if (tree_int_cst_equal (p
->index
, p
->range_end
) && !p
->prev
)
6683 constructor_index
= p
->index
;
6684 constructor_fields
= p
->fields
;
6685 if (finish
&& p
->range_end
&& p
->index
== p
->range_start
)
6693 push_init_level (2);
6694 p
->stack
= constructor_stack
;
6695 if (p
->range_end
&& tree_int_cst_equal (p
->index
, p
->range_end
))
6696 p
->index
= p
->range_start
;
6700 constructor_range_stack
= range_stack
;
6707 constructor_range_stack
= 0;
6710 /* Build a complete asm-statement, whose components are a CV_QUALIFIER
6711 (guaranteed to be 'volatile' or null) and ARGS (represented using
6712 an ASM_EXPR node). */
6714 build_asm_stmt (tree cv_qualifier
, tree args
)
6716 if (!ASM_VOLATILE_P (args
) && cv_qualifier
)
6717 ASM_VOLATILE_P (args
) = 1;
6718 return add_stmt (args
);
6721 /* Build an asm-expr, whose components are a STRING, some OUTPUTS,
6722 some INPUTS, and some CLOBBERS. The latter three may be NULL.
6723 SIMPLE indicates whether there was anything at all after the
6724 string in the asm expression -- asm("blah") and asm("blah" : )
6725 are subtly different. We use a ASM_EXPR node to represent this. */
6727 build_asm_expr (tree string
, tree outputs
, tree inputs
, tree clobbers
,
6733 const char *constraint
;
6734 const char **oconstraints
;
6735 bool allows_mem
, allows_reg
, is_inout
;
6736 int ninputs
, noutputs
;
6738 ninputs
= list_length (inputs
);
6739 noutputs
= list_length (outputs
);
6740 oconstraints
= (const char **) alloca (noutputs
* sizeof (const char *));
6742 string
= resolve_asm_operand_names (string
, outputs
, inputs
);
6744 /* Remove output conversions that change the type but not the mode. */
6745 for (i
= 0, tail
= outputs
; tail
; ++i
, tail
= TREE_CHAIN (tail
))
6747 tree output
= TREE_VALUE (tail
);
6749 /* ??? Really, this should not be here. Users should be using a
6750 proper lvalue, dammit. But there's a long history of using casts
6751 in the output operands. In cases like longlong.h, this becomes a
6752 primitive form of typechecking -- if the cast can be removed, then
6753 the output operand had a type of the proper width; otherwise we'll
6754 get an error. Gross, but ... */
6755 STRIP_NOPS (output
);
6757 if (!lvalue_or_else (output
, lv_asm
))
6758 output
= error_mark_node
;
6760 if (output
!= error_mark_node
6761 && (TREE_READONLY (output
)
6762 || TYPE_READONLY (TREE_TYPE (output
))
6763 || ((TREE_CODE (TREE_TYPE (output
)) == RECORD_TYPE
6764 || TREE_CODE (TREE_TYPE (output
)) == UNION_TYPE
)
6765 && C_TYPE_FIELDS_READONLY (TREE_TYPE (output
)))))
6766 readonly_error (output
, lv_asm
);
6768 constraint
= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail
)));
6769 oconstraints
[i
] = constraint
;
6771 if (parse_output_constraint (&constraint
, i
, ninputs
, noutputs
,
6772 &allows_mem
, &allows_reg
, &is_inout
))
6774 /* If the operand is going to end up in memory,
6775 mark it addressable. */
6776 if (!allows_reg
&& !c_mark_addressable (output
))
6777 output
= error_mark_node
;
6780 output
= error_mark_node
;
6782 TREE_VALUE (tail
) = output
;
6785 for (i
= 0, tail
= inputs
; tail
; ++i
, tail
= TREE_CHAIN (tail
))
6789 constraint
= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail
)));
6790 input
= TREE_VALUE (tail
);
6792 if (parse_input_constraint (&constraint
, i
, ninputs
, noutputs
, 0,
6793 oconstraints
, &allows_mem
, &allows_reg
))
6795 /* If the operand is going to end up in memory,
6796 mark it addressable. */
6797 if (!allows_reg
&& allows_mem
)
6799 /* Strip the nops as we allow this case. FIXME, this really
6800 should be rejected or made deprecated. */
6802 if (!c_mark_addressable (input
))
6803 input
= error_mark_node
;
6807 input
= error_mark_node
;
6809 TREE_VALUE (tail
) = input
;
6812 args
= build_stmt (ASM_EXPR
, string
, outputs
, inputs
, clobbers
);
6814 /* asm statements without outputs, including simple ones, are treated
6816 ASM_INPUT_P (args
) = simple
;
6817 ASM_VOLATILE_P (args
) = (noutputs
== 0);
6822 /* Generate a goto statement to LABEL. */
6825 c_finish_goto_label (tree label
)
6827 tree decl
= lookup_label (label
);
6831 if (C_DECL_UNJUMPABLE_STMT_EXPR (decl
))
6833 error ("jump into statement expression");
6837 if (C_DECL_UNJUMPABLE_VM (decl
))
6839 error ("jump into scope of identifier with variably modified type");
6843 if (!C_DECL_UNDEFINABLE_STMT_EXPR (decl
))
6845 /* No jump from outside this statement expression context, so
6846 record that there is a jump from within this context. */
6847 struct c_label_list
*nlist
;
6848 nlist
= XOBNEW (&parser_obstack
, struct c_label_list
);
6849 nlist
->next
= label_context_stack_se
->labels_used
;
6850 nlist
->label
= decl
;
6851 label_context_stack_se
->labels_used
= nlist
;
6854 if (!C_DECL_UNDEFINABLE_VM (decl
))
6856 /* No jump from outside this context context of identifiers with
6857 variably modified type, so record that there is a jump from
6858 within this context. */
6859 struct c_label_list
*nlist
;
6860 nlist
= XOBNEW (&parser_obstack
, struct c_label_list
);
6861 nlist
->next
= label_context_stack_vm
->labels_used
;
6862 nlist
->label
= decl
;
6863 label_context_stack_vm
->labels_used
= nlist
;
6866 TREE_USED (decl
) = 1;
6867 return add_stmt (build1 (GOTO_EXPR
, void_type_node
, decl
));
6870 /* Generate a computed goto statement to EXPR. */
6873 c_finish_goto_ptr (tree expr
)
6876 pedwarn ("ISO C forbids %<goto *expr;%>");
6877 expr
= convert (ptr_type_node
, expr
);
6878 return add_stmt (build1 (GOTO_EXPR
, void_type_node
, expr
));
6881 /* Generate a C `return' statement. RETVAL is the expression for what
6882 to return, or a null pointer for `return;' with no value. */
6885 c_finish_return (tree retval
)
6887 tree valtype
= TREE_TYPE (TREE_TYPE (current_function_decl
)), ret_stmt
;
6888 bool no_warning
= false;
6890 if (TREE_THIS_VOLATILE (current_function_decl
))
6891 warning (0, "function declared %<noreturn%> has a %<return%> statement");
6895 current_function_returns_null
= 1;
6896 if ((warn_return_type
|| flag_isoc99
)
6897 && valtype
!= 0 && TREE_CODE (valtype
) != VOID_TYPE
)
6899 pedwarn_c99 ("%<return%> with no value, in "
6900 "function returning non-void");
6904 else if (valtype
== 0 || TREE_CODE (valtype
) == VOID_TYPE
)
6906 current_function_returns_null
= 1;
6907 if (pedantic
|| TREE_CODE (TREE_TYPE (retval
)) != VOID_TYPE
)
6908 pedwarn ("%<return%> with a value, in function returning void");
6912 tree t
= convert_for_assignment (valtype
, retval
, ic_return
,
6913 NULL_TREE
, NULL_TREE
, 0);
6914 tree res
= DECL_RESULT (current_function_decl
);
6917 current_function_returns_value
= 1;
6918 if (t
== error_mark_node
)
6921 inner
= t
= convert (TREE_TYPE (res
), t
);
6923 /* Strip any conversions, additions, and subtractions, and see if
6924 we are returning the address of a local variable. Warn if so. */
6927 switch (TREE_CODE (inner
))
6929 case NOP_EXPR
: case NON_LVALUE_EXPR
: case CONVERT_EXPR
:
6931 inner
= TREE_OPERAND (inner
, 0);
6935 /* If the second operand of the MINUS_EXPR has a pointer
6936 type (or is converted from it), this may be valid, so
6937 don't give a warning. */
6939 tree op1
= TREE_OPERAND (inner
, 1);
6941 while (!POINTER_TYPE_P (TREE_TYPE (op1
))
6942 && (TREE_CODE (op1
) == NOP_EXPR
6943 || TREE_CODE (op1
) == NON_LVALUE_EXPR
6944 || TREE_CODE (op1
) == CONVERT_EXPR
))
6945 op1
= TREE_OPERAND (op1
, 0);
6947 if (POINTER_TYPE_P (TREE_TYPE (op1
)))
6950 inner
= TREE_OPERAND (inner
, 0);
6955 inner
= TREE_OPERAND (inner
, 0);
6957 while (REFERENCE_CLASS_P (inner
)
6958 && TREE_CODE (inner
) != INDIRECT_REF
)
6959 inner
= TREE_OPERAND (inner
, 0);
6962 && !DECL_EXTERNAL (inner
)
6963 && !TREE_STATIC (inner
)
6964 && DECL_CONTEXT (inner
) == current_function_decl
)
6965 warning (0, "function returns address of local variable");
6975 retval
= build2 (MODIFY_EXPR
, TREE_TYPE (res
), res
, t
);
6978 ret_stmt
= build_stmt (RETURN_EXPR
, retval
);
6979 TREE_NO_WARNING (ret_stmt
) |= no_warning
;
6980 return add_stmt (ret_stmt
);
6984 /* The SWITCH_EXPR being built. */
6987 /* The original type of the testing expression, i.e. before the
6988 default conversion is applied. */
6991 /* A splay-tree mapping the low element of a case range to the high
6992 element, or NULL_TREE if there is no high element. Used to
6993 determine whether or not a new case label duplicates an old case
6994 label. We need a tree, rather than simply a hash table, because
6995 of the GNU case range extension. */
6998 /* Number of nested statement expressions within this switch
6999 statement; if nonzero, case and default labels may not
7001 unsigned int blocked_stmt_expr
;
7003 /* Scope of outermost declarations of identifiers with variably
7004 modified type within this switch statement; if nonzero, case and
7005 default labels may not appear. */
7006 unsigned int blocked_vm
;
7008 /* The next node on the stack. */
7009 struct c_switch
*next
;
7012 /* A stack of the currently active switch statements. The innermost
7013 switch statement is on the top of the stack. There is no need to
7014 mark the stack for garbage collection because it is only active
7015 during the processing of the body of a function, and we never
7016 collect at that point. */
7018 struct c_switch
*c_switch_stack
;
7020 /* Start a C switch statement, testing expression EXP. Return the new
7024 c_start_case (tree exp
)
7026 enum tree_code code
;
7027 tree type
, orig_type
= error_mark_node
;
7028 struct c_switch
*cs
;
7030 if (exp
!= error_mark_node
)
7032 code
= TREE_CODE (TREE_TYPE (exp
));
7033 orig_type
= TREE_TYPE (exp
);
7035 if (!INTEGRAL_TYPE_P (orig_type
)
7036 && code
!= ERROR_MARK
)
7038 error ("switch quantity not an integer");
7039 exp
= integer_zero_node
;
7040 orig_type
= error_mark_node
;
7044 type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
7046 if (!in_system_header
7047 && (type
== long_integer_type_node
7048 || type
== long_unsigned_type_node
))
7049 warning (OPT_Wtraditional
, "%<long%> switch expression not "
7050 "converted to %<int%> in ISO C");
7052 exp
= default_conversion (exp
);
7053 type
= TREE_TYPE (exp
);
7057 /* Add this new SWITCH_EXPR to the stack. */
7058 cs
= XNEW (struct c_switch
);
7059 cs
->switch_expr
= build3 (SWITCH_EXPR
, orig_type
, exp
, NULL_TREE
, NULL_TREE
);
7060 cs
->orig_type
= orig_type
;
7061 cs
->cases
= splay_tree_new (case_compare
, NULL
, NULL
);
7062 cs
->blocked_stmt_expr
= 0;
7064 cs
->next
= c_switch_stack
;
7065 c_switch_stack
= cs
;
7067 return add_stmt (cs
->switch_expr
);
7070 /* Process a case label. */
7073 do_case (tree low_value
, tree high_value
)
7075 tree label
= NULL_TREE
;
7077 if (c_switch_stack
&& !c_switch_stack
->blocked_stmt_expr
7078 && !c_switch_stack
->blocked_vm
)
7080 label
= c_add_case_label (c_switch_stack
->cases
,
7081 SWITCH_COND (c_switch_stack
->switch_expr
),
7082 c_switch_stack
->orig_type
,
7083 low_value
, high_value
);
7084 if (label
== error_mark_node
)
7087 else if (c_switch_stack
&& c_switch_stack
->blocked_stmt_expr
)
7090 error ("case label in statement expression not containing "
7091 "enclosing switch statement");
7093 error ("%<default%> label in statement expression not containing "
7094 "enclosing switch statement");
7096 else if (c_switch_stack
&& c_switch_stack
->blocked_vm
)
7099 error ("case label in scope of identifier with variably modified "
7100 "type not containing enclosing switch statement");
7102 error ("%<default%> label in scope of identifier with variably "
7103 "modified type not containing enclosing switch statement");
7106 error ("case label not within a switch statement");
7108 error ("%<default%> label not within a switch statement");
7113 /* Finish the switch statement. */
7116 c_finish_case (tree body
)
7118 struct c_switch
*cs
= c_switch_stack
;
7119 location_t switch_location
;
7121 SWITCH_BODY (cs
->switch_expr
) = body
;
7123 /* We must not be within a statement expression nested in the switch
7124 at this point; we might, however, be within the scope of an
7125 identifier with variably modified type nested in the switch. */
7126 gcc_assert (!cs
->blocked_stmt_expr
);
7128 /* Emit warnings as needed. */
7129 if (EXPR_HAS_LOCATION (cs
->switch_expr
))
7130 switch_location
= EXPR_LOCATION (cs
->switch_expr
);
7132 switch_location
= input_location
;
7133 c_do_switch_warnings (cs
->cases
, switch_location
,
7134 TREE_TYPE (cs
->switch_expr
),
7135 SWITCH_COND (cs
->switch_expr
));
7137 /* Pop the stack. */
7138 c_switch_stack
= cs
->next
;
7139 splay_tree_delete (cs
->cases
);
7143 /* Emit an if statement. IF_LOCUS is the location of the 'if'. COND,
7144 THEN_BLOCK and ELSE_BLOCK are expressions to be used; ELSE_BLOCK
7145 may be null. NESTED_IF is true if THEN_BLOCK contains another IF
7146 statement, and was not surrounded with parenthesis. */
7149 c_finish_if_stmt (location_t if_locus
, tree cond
, tree then_block
,
7150 tree else_block
, bool nested_if
)
7154 /* Diagnose an ambiguous else if if-then-else is nested inside if-then. */
7155 if (warn_parentheses
&& nested_if
&& else_block
== NULL
)
7157 tree inner_if
= then_block
;
7159 /* We know from the grammar productions that there is an IF nested
7160 within THEN_BLOCK. Due to labels and c99 conditional declarations,
7161 it might not be exactly THEN_BLOCK, but should be the last
7162 non-container statement within. */
7164 switch (TREE_CODE (inner_if
))
7169 inner_if
= BIND_EXPR_BODY (inner_if
);
7171 case STATEMENT_LIST
:
7172 inner_if
= expr_last (then_block
);
7174 case TRY_FINALLY_EXPR
:
7175 case TRY_CATCH_EXPR
:
7176 inner_if
= TREE_OPERAND (inner_if
, 0);
7183 if (COND_EXPR_ELSE (inner_if
))
7184 warning (OPT_Wparentheses
,
7185 "%Hsuggest explicit braces to avoid ambiguous %<else%>",
7189 /* Diagnose ";" via the special empty statement node that we create. */
7192 tree
*inner_then
= &then_block
, *inner_else
= &else_block
;
7194 if (TREE_CODE (*inner_then
) == STATEMENT_LIST
7195 && STATEMENT_LIST_TAIL (*inner_then
))
7196 inner_then
= &STATEMENT_LIST_TAIL (*inner_then
)->stmt
;
7197 if (*inner_else
&& TREE_CODE (*inner_else
) == STATEMENT_LIST
7198 && STATEMENT_LIST_TAIL (*inner_else
))
7199 inner_else
= &STATEMENT_LIST_TAIL (*inner_else
)->stmt
;
7201 if (TREE_CODE (*inner_then
) == NOP_EXPR
&& !TREE_TYPE (*inner_then
))
7204 warning (0, "%Hempty body in an if-statement",
7205 EXPR_LOCUS (*inner_then
));
7207 *inner_then
= alloc_stmt_list ();
7210 && TREE_CODE (*inner_else
) == NOP_EXPR
7211 && !TREE_TYPE (*inner_else
))
7213 warning (0, "%Hempty body in an else-statement",
7214 EXPR_LOCUS (*inner_else
));
7216 *inner_else
= alloc_stmt_list ();
7220 stmt
= build3 (COND_EXPR
, void_type_node
, cond
, then_block
, else_block
);
7221 SET_EXPR_LOCATION (stmt
, if_locus
);
7225 /* Emit a general-purpose loop construct. START_LOCUS is the location of
7226 the beginning of the loop. COND is the loop condition. COND_IS_FIRST
7227 is false for DO loops. INCR is the FOR increment expression. BODY is
7228 the statement controlled by the loop. BLAB is the break label. CLAB is
7229 the continue label. Everything is allowed to be NULL. */
7232 c_finish_loop (location_t start_locus
, tree cond
, tree incr
, tree body
,
7233 tree blab
, tree clab
, bool cond_is_first
)
7235 tree entry
= NULL
, exit
= NULL
, t
;
7237 /* If the condition is zero don't generate a loop construct. */
7238 if (cond
&& integer_zerop (cond
))
7242 t
= build_and_jump (&blab
);
7243 SET_EXPR_LOCATION (t
, start_locus
);
7249 tree top
= build1 (LABEL_EXPR
, void_type_node
, NULL_TREE
);
7251 /* If we have an exit condition, then we build an IF with gotos either
7252 out of the loop, or to the top of it. If there's no exit condition,
7253 then we just build a jump back to the top. */
7254 exit
= build_and_jump (&LABEL_EXPR_LABEL (top
));
7256 if (cond
&& !integer_nonzerop (cond
))
7258 /* Canonicalize the loop condition to the end. This means
7259 generating a branch to the loop condition. Reuse the
7260 continue label, if possible. */
7265 entry
= build1 (LABEL_EXPR
, void_type_node
, NULL_TREE
);
7266 t
= build_and_jump (&LABEL_EXPR_LABEL (entry
));
7269 t
= build1 (GOTO_EXPR
, void_type_node
, clab
);
7270 SET_EXPR_LOCATION (t
, start_locus
);
7274 t
= build_and_jump (&blab
);
7275 exit
= fold_build3 (COND_EXPR
, void_type_node
, cond
, exit
, t
);
7277 SET_EXPR_LOCATION (exit
, start_locus
);
7279 SET_EXPR_LOCATION (exit
, input_location
);
7288 add_stmt (build1 (LABEL_EXPR
, void_type_node
, clab
));
7296 add_stmt (build1 (LABEL_EXPR
, void_type_node
, blab
));
7300 c_finish_bc_stmt (tree
*label_p
, bool is_break
)
7303 tree label
= *label_p
;
7305 /* In switch statements break is sometimes stylistically used after
7306 a return statement. This can lead to spurious warnings about
7307 control reaching the end of a non-void function when it is
7308 inlined. Note that we are calling block_may_fallthru with
7309 language specific tree nodes; this works because
7310 block_may_fallthru returns true when given something it does not
7312 skip
= !block_may_fallthru (cur_stmt_list
);
7317 *label_p
= label
= create_artificial_label ();
7319 else if (TREE_CODE (label
) == LABEL_DECL
)
7321 else switch (TREE_INT_CST_LOW (label
))
7325 error ("break statement not within loop or switch");
7327 error ("continue statement not within a loop");
7331 gcc_assert (is_break
);
7332 error ("break statement used with OpenMP for loop");
7342 return add_stmt (build1 (GOTO_EXPR
, void_type_node
, label
));
7345 /* A helper routine for c_process_expr_stmt and c_finish_stmt_expr. */
7348 emit_side_effect_warnings (tree expr
)
7350 if (expr
== error_mark_node
)
7352 else if (!TREE_SIDE_EFFECTS (expr
))
7354 if (!VOID_TYPE_P (TREE_TYPE (expr
)) && !TREE_NO_WARNING (expr
))
7355 warning (0, "%Hstatement with no effect",
7356 EXPR_HAS_LOCATION (expr
) ? EXPR_LOCUS (expr
) : &input_location
);
7358 else if (warn_unused_value
)
7359 warn_if_unused_value (expr
, input_location
);
7362 /* Process an expression as if it were a complete statement. Emit
7363 diagnostics, but do not call ADD_STMT. */
7366 c_process_expr_stmt (tree expr
)
7371 if (warn_sequence_point
)
7372 verify_sequence_points (expr
);
7374 if (TREE_TYPE (expr
) != error_mark_node
7375 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr
))
7376 && TREE_CODE (TREE_TYPE (expr
)) != ARRAY_TYPE
)
7377 error ("expression statement has incomplete type");
7379 /* If we're not processing a statement expression, warn about unused values.
7380 Warnings for statement expressions will be emitted later, once we figure
7381 out which is the result. */
7382 if (!STATEMENT_LIST_STMT_EXPR (cur_stmt_list
)
7383 && (extra_warnings
|| warn_unused_value
))
7384 emit_side_effect_warnings (expr
);
7386 /* If the expression is not of a type to which we cannot assign a line
7387 number, wrap the thing in a no-op NOP_EXPR. */
7388 if (DECL_P (expr
) || CONSTANT_CLASS_P (expr
))
7389 expr
= build1 (NOP_EXPR
, TREE_TYPE (expr
), expr
);
7392 SET_EXPR_LOCATION (expr
, input_location
);
7397 /* Emit an expression as a statement. */
7400 c_finish_expr_stmt (tree expr
)
7403 return add_stmt (c_process_expr_stmt (expr
));
7408 /* Do the opposite and emit a statement as an expression. To begin,
7409 create a new binding level and return it. */
7412 c_begin_stmt_expr (void)
7415 struct c_label_context_se
*nstack
;
7416 struct c_label_list
*glist
;
7418 /* We must force a BLOCK for this level so that, if it is not expanded
7419 later, there is a way to turn off the entire subtree of blocks that
7420 are contained in it. */
7422 ret
= c_begin_compound_stmt (true);
7425 c_switch_stack
->blocked_stmt_expr
++;
7426 gcc_assert (c_switch_stack
->blocked_stmt_expr
!= 0);
7428 for (glist
= label_context_stack_se
->labels_used
;
7430 glist
= glist
->next
)
7432 C_DECL_UNDEFINABLE_STMT_EXPR (glist
->label
) = 1;
7434 nstack
= XOBNEW (&parser_obstack
, struct c_label_context_se
);
7435 nstack
->labels_def
= NULL
;
7436 nstack
->labels_used
= NULL
;
7437 nstack
->next
= label_context_stack_se
;
7438 label_context_stack_se
= nstack
;
7440 /* Mark the current statement list as belonging to a statement list. */
7441 STATEMENT_LIST_STMT_EXPR (ret
) = 1;
7447 c_finish_stmt_expr (tree body
)
7449 tree last
, type
, tmp
, val
;
7451 struct c_label_list
*dlist
, *glist
, *glist_prev
= NULL
;
7453 body
= c_end_compound_stmt (body
, true);
7456 gcc_assert (c_switch_stack
->blocked_stmt_expr
!= 0);
7457 c_switch_stack
->blocked_stmt_expr
--;
7459 /* It is no longer possible to jump to labels defined within this
7460 statement expression. */
7461 for (dlist
= label_context_stack_se
->labels_def
;
7463 dlist
= dlist
->next
)
7465 C_DECL_UNJUMPABLE_STMT_EXPR (dlist
->label
) = 1;
7467 /* It is again possible to define labels with a goto just outside
7468 this statement expression. */
7469 for (glist
= label_context_stack_se
->next
->labels_used
;
7471 glist
= glist
->next
)
7473 C_DECL_UNDEFINABLE_STMT_EXPR (glist
->label
) = 0;
7476 if (glist_prev
!= NULL
)
7477 glist_prev
->next
= label_context_stack_se
->labels_used
;
7479 label_context_stack_se
->next
->labels_used
7480 = label_context_stack_se
->labels_used
;
7481 label_context_stack_se
= label_context_stack_se
->next
;
7483 /* Locate the last statement in BODY. See c_end_compound_stmt
7484 about always returning a BIND_EXPR. */
7485 last_p
= &BIND_EXPR_BODY (body
);
7486 last
= BIND_EXPR_BODY (body
);
7489 if (TREE_CODE (last
) == STATEMENT_LIST
)
7491 tree_stmt_iterator i
;
7493 /* This can happen with degenerate cases like ({ }). No value. */
7494 if (!TREE_SIDE_EFFECTS (last
))
7497 /* If we're supposed to generate side effects warnings, process
7498 all of the statements except the last. */
7499 if (extra_warnings
|| warn_unused_value
)
7501 for (i
= tsi_start (last
); !tsi_one_before_end_p (i
); tsi_next (&i
))
7502 emit_side_effect_warnings (tsi_stmt (i
));
7505 i
= tsi_last (last
);
7506 last_p
= tsi_stmt_ptr (i
);
7510 /* If the end of the list is exception related, then the list was split
7511 by a call to push_cleanup. Continue searching. */
7512 if (TREE_CODE (last
) == TRY_FINALLY_EXPR
7513 || TREE_CODE (last
) == TRY_CATCH_EXPR
)
7515 last_p
= &TREE_OPERAND (last
, 0);
7517 goto continue_searching
;
7520 /* In the case that the BIND_EXPR is not necessary, return the
7521 expression out from inside it. */
7522 if (last
== error_mark_node
7523 || (last
== BIND_EXPR_BODY (body
)
7524 && BIND_EXPR_VARS (body
) == NULL
))
7526 /* Do not warn if the return value of a statement expression is
7529 TREE_NO_WARNING (last
) = 1;
7533 /* Extract the type of said expression. */
7534 type
= TREE_TYPE (last
);
7536 /* If we're not returning a value at all, then the BIND_EXPR that
7537 we already have is a fine expression to return. */
7538 if (!type
|| VOID_TYPE_P (type
))
7541 /* Now that we've located the expression containing the value, it seems
7542 silly to make voidify_wrapper_expr repeat the process. Create a
7543 temporary of the appropriate type and stick it in a TARGET_EXPR. */
7544 tmp
= create_tmp_var_raw (type
, NULL
);
7546 /* Unwrap a no-op NOP_EXPR as added by c_finish_expr_stmt. This avoids
7547 tree_expr_nonnegative_p giving up immediately. */
7549 if (TREE_CODE (val
) == NOP_EXPR
7550 && TREE_TYPE (val
) == TREE_TYPE (TREE_OPERAND (val
, 0)))
7551 val
= TREE_OPERAND (val
, 0);
7553 *last_p
= build2 (MODIFY_EXPR
, void_type_node
, tmp
, val
);
7554 SET_EXPR_LOCUS (*last_p
, EXPR_LOCUS (last
));
7556 return build4 (TARGET_EXPR
, type
, tmp
, body
, NULL_TREE
, NULL_TREE
);
7559 /* Begin the scope of an identifier of variably modified type, scope
7560 number SCOPE. Jumping from outside this scope to inside it is not
7564 c_begin_vm_scope (unsigned int scope
)
7566 struct c_label_context_vm
*nstack
;
7567 struct c_label_list
*glist
;
7569 gcc_assert (scope
> 0);
7570 if (c_switch_stack
&& !c_switch_stack
->blocked_vm
)
7571 c_switch_stack
->blocked_vm
= scope
;
7572 for (glist
= label_context_stack_vm
->labels_used
;
7574 glist
= glist
->next
)
7576 C_DECL_UNDEFINABLE_VM (glist
->label
) = 1;
7578 nstack
= XOBNEW (&parser_obstack
, struct c_label_context_vm
);
7579 nstack
->labels_def
= NULL
;
7580 nstack
->labels_used
= NULL
;
7581 nstack
->scope
= scope
;
7582 nstack
->next
= label_context_stack_vm
;
7583 label_context_stack_vm
= nstack
;
7586 /* End a scope which may contain identifiers of variably modified
7587 type, scope number SCOPE. */
7590 c_end_vm_scope (unsigned int scope
)
7592 if (label_context_stack_vm
== NULL
)
7594 if (c_switch_stack
&& c_switch_stack
->blocked_vm
== scope
)
7595 c_switch_stack
->blocked_vm
= 0;
7596 /* We may have a number of nested scopes of identifiers with
7597 variably modified type, all at this depth. Pop each in turn. */
7598 while (label_context_stack_vm
->scope
== scope
)
7600 struct c_label_list
*dlist
, *glist
, *glist_prev
= NULL
;
7602 /* It is no longer possible to jump to labels defined within this
7604 for (dlist
= label_context_stack_vm
->labels_def
;
7606 dlist
= dlist
->next
)
7608 C_DECL_UNJUMPABLE_VM (dlist
->label
) = 1;
7610 /* It is again possible to define labels with a goto just outside
7612 for (glist
= label_context_stack_vm
->next
->labels_used
;
7614 glist
= glist
->next
)
7616 C_DECL_UNDEFINABLE_VM (glist
->label
) = 0;
7619 if (glist_prev
!= NULL
)
7620 glist_prev
->next
= label_context_stack_vm
->labels_used
;
7622 label_context_stack_vm
->next
->labels_used
7623 = label_context_stack_vm
->labels_used
;
7624 label_context_stack_vm
= label_context_stack_vm
->next
;
7628 /* Begin and end compound statements. This is as simple as pushing
7629 and popping new statement lists from the tree. */
7632 c_begin_compound_stmt (bool do_scope
)
7634 tree stmt
= push_stmt_list ();
7641 c_end_compound_stmt (tree stmt
, bool do_scope
)
7647 if (c_dialect_objc ())
7648 objc_clear_super_receiver ();
7649 block
= pop_scope ();
7652 stmt
= pop_stmt_list (stmt
);
7653 stmt
= c_build_bind_expr (block
, stmt
);
7655 /* If this compound statement is nested immediately inside a statement
7656 expression, then force a BIND_EXPR to be created. Otherwise we'll
7657 do the wrong thing for ({ { 1; } }) or ({ 1; { } }). In particular,
7658 STATEMENT_LISTs merge, and thus we can lose track of what statement
7661 && STATEMENT_LIST_STMT_EXPR (cur_stmt_list
)
7662 && TREE_CODE (stmt
) != BIND_EXPR
)
7664 stmt
= build3 (BIND_EXPR
, void_type_node
, NULL
, stmt
, NULL
);
7665 TREE_SIDE_EFFECTS (stmt
) = 1;
7671 /* Queue a cleanup. CLEANUP is an expression/statement to be executed
7672 when the current scope is exited. EH_ONLY is true when this is not
7673 meant to apply to normal control flow transfer. */
7676 push_cleanup (tree
ARG_UNUSED (decl
), tree cleanup
, bool eh_only
)
7678 enum tree_code code
;
7682 code
= eh_only
? TRY_CATCH_EXPR
: TRY_FINALLY_EXPR
;
7683 stmt
= build_stmt (code
, NULL
, cleanup
);
7685 stmt_expr
= STATEMENT_LIST_STMT_EXPR (cur_stmt_list
);
7686 list
= push_stmt_list ();
7687 TREE_OPERAND (stmt
, 0) = list
;
7688 STATEMENT_LIST_STMT_EXPR (list
) = stmt_expr
;
7691 /* Build a binary-operation expression without default conversions.
7692 CODE is the kind of expression to build.
7693 This function differs from `build' in several ways:
7694 the data type of the result is computed and recorded in it,
7695 warnings are generated if arg data types are invalid,
7696 special handling for addition and subtraction of pointers is known,
7697 and some optimization is done (operations on narrow ints
7698 are done in the narrower type when that gives the same result).
7699 Constant folding is also done before the result is returned.
7701 Note that the operands will never have enumeral types, or function
7702 or array types, because either they will have the default conversions
7703 performed or they have both just been converted to some other type in which
7704 the arithmetic is to be done. */
7707 build_binary_op (enum tree_code code
, tree orig_op0
, tree orig_op1
,
7711 enum tree_code code0
, code1
;
7713 const char *invalid_op_diag
;
7715 /* Expression code to give to the expression when it is built.
7716 Normally this is CODE, which is what the caller asked for,
7717 but in some special cases we change it. */
7718 enum tree_code resultcode
= code
;
7720 /* Data type in which the computation is to be performed.
7721 In the simplest cases this is the common type of the arguments. */
7722 tree result_type
= NULL
;
7724 /* Nonzero means operands have already been type-converted
7725 in whatever way is necessary.
7726 Zero means they need to be converted to RESULT_TYPE. */
7729 /* Nonzero means create the expression with this type, rather than
7731 tree build_type
= 0;
7733 /* Nonzero means after finally constructing the expression
7734 convert it to this type. */
7735 tree final_type
= 0;
7737 /* Nonzero if this is an operation like MIN or MAX which can
7738 safely be computed in short if both args are promoted shorts.
7739 Also implies COMMON.
7740 -1 indicates a bitwise operation; this makes a difference
7741 in the exact conditions for when it is safe to do the operation
7742 in a narrower mode. */
7745 /* Nonzero if this is a comparison operation;
7746 if both args are promoted shorts, compare the original shorts.
7747 Also implies COMMON. */
7748 int short_compare
= 0;
7750 /* Nonzero if this is a right-shift operation, which can be computed on the
7751 original short and then promoted if the operand is a promoted short. */
7752 int short_shift
= 0;
7754 /* Nonzero means set RESULT_TYPE to the common type of the args. */
7757 /* True means types are compatible as far as ObjC is concerned. */
7762 op0
= default_conversion (orig_op0
);
7763 op1
= default_conversion (orig_op1
);
7771 type0
= TREE_TYPE (op0
);
7772 type1
= TREE_TYPE (op1
);
7774 /* The expression codes of the data types of the arguments tell us
7775 whether the arguments are integers, floating, pointers, etc. */
7776 code0
= TREE_CODE (type0
);
7777 code1
= TREE_CODE (type1
);
7779 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
7780 STRIP_TYPE_NOPS (op0
);
7781 STRIP_TYPE_NOPS (op1
);
7783 /* If an error was already reported for one of the arguments,
7784 avoid reporting another error. */
7786 if (code0
== ERROR_MARK
|| code1
== ERROR_MARK
)
7787 return error_mark_node
;
7789 if ((invalid_op_diag
7790 = targetm
.invalid_binary_op (code
, type0
, type1
)))
7792 error (invalid_op_diag
);
7793 return error_mark_node
;
7796 objc_ok
= objc_compare_types (type0
, type1
, -3, NULL_TREE
);
7801 /* Handle the pointer + int case. */
7802 if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
7803 return pointer_int_sum (PLUS_EXPR
, op0
, op1
);
7804 else if (code1
== POINTER_TYPE
&& code0
== INTEGER_TYPE
)
7805 return pointer_int_sum (PLUS_EXPR
, op1
, op0
);
7811 /* Subtraction of two similar pointers.
7812 We must subtract them as integers, then divide by object size. */
7813 if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
7814 && comp_target_types (type0
, type1
))
7815 return pointer_diff (op0
, op1
);
7816 /* Handle pointer minus int. Just like pointer plus int. */
7817 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
7818 return pointer_int_sum (MINUS_EXPR
, op0
, op1
);
7827 case TRUNC_DIV_EXPR
:
7829 case FLOOR_DIV_EXPR
:
7830 case ROUND_DIV_EXPR
:
7831 case EXACT_DIV_EXPR
:
7832 /* Floating point division by zero is a legitimate way to obtain
7833 infinities and NaNs. */
7834 if (skip_evaluation
== 0 && integer_zerop (op1
))
7835 warning (OPT_Wdiv_by_zero
, "division by zero");
7837 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
7838 || code0
== COMPLEX_TYPE
|| code0
== VECTOR_TYPE
)
7839 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
7840 || code1
== COMPLEX_TYPE
|| code1
== VECTOR_TYPE
))
7842 enum tree_code tcode0
= code0
, tcode1
= code1
;
7844 if (code0
== COMPLEX_TYPE
|| code0
== VECTOR_TYPE
)
7845 tcode0
= TREE_CODE (TREE_TYPE (TREE_TYPE (op0
)));
7846 if (code1
== COMPLEX_TYPE
|| code1
== VECTOR_TYPE
)
7847 tcode1
= TREE_CODE (TREE_TYPE (TREE_TYPE (op1
)));
7849 if (!(tcode0
== INTEGER_TYPE
&& tcode1
== INTEGER_TYPE
))
7850 resultcode
= RDIV_EXPR
;
7852 /* Although it would be tempting to shorten always here, that
7853 loses on some targets, since the modulo instruction is
7854 undefined if the quotient can't be represented in the
7855 computation mode. We shorten only if unsigned or if
7856 dividing by something we know != -1. */
7857 shorten
= (TYPE_UNSIGNED (TREE_TYPE (orig_op0
))
7858 || (TREE_CODE (op1
) == INTEGER_CST
7859 && !integer_all_onesp (op1
)));
7867 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
7869 else if (code0
== VECTOR_TYPE
&& code1
== VECTOR_TYPE
)
7873 case TRUNC_MOD_EXPR
:
7874 case FLOOR_MOD_EXPR
:
7875 if (skip_evaluation
== 0 && integer_zerop (op1
))
7876 warning (OPT_Wdiv_by_zero
, "division by zero");
7878 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
7880 /* Although it would be tempting to shorten always here, that loses
7881 on some targets, since the modulo instruction is undefined if the
7882 quotient can't be represented in the computation mode. We shorten
7883 only if unsigned or if dividing by something we know != -1. */
7884 shorten
= (TYPE_UNSIGNED (TREE_TYPE (orig_op0
))
7885 || (TREE_CODE (op1
) == INTEGER_CST
7886 && !integer_all_onesp (op1
)));
7891 case TRUTH_ANDIF_EXPR
:
7892 case TRUTH_ORIF_EXPR
:
7893 case TRUTH_AND_EXPR
:
7895 case TRUTH_XOR_EXPR
:
7896 if ((code0
== INTEGER_TYPE
|| code0
== POINTER_TYPE
7897 || code0
== REAL_TYPE
|| code0
== COMPLEX_TYPE
)
7898 && (code1
== INTEGER_TYPE
|| code1
== POINTER_TYPE
7899 || code1
== REAL_TYPE
|| code1
== COMPLEX_TYPE
))
7901 /* Result of these operations is always an int,
7902 but that does not mean the operands should be
7903 converted to ints! */
7904 result_type
= integer_type_node
;
7905 op0
= c_common_truthvalue_conversion (op0
);
7906 op1
= c_common_truthvalue_conversion (op1
);
7911 /* Shift operations: result has same type as first operand;
7912 always convert second operand to int.
7913 Also set SHORT_SHIFT if shifting rightward. */
7916 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
7918 if (TREE_CODE (op1
) == INTEGER_CST
&& skip_evaluation
== 0)
7920 if (tree_int_cst_sgn (op1
) < 0)
7921 warning (0, "right shift count is negative");
7924 if (!integer_zerop (op1
))
7927 if (compare_tree_int (op1
, TYPE_PRECISION (type0
)) >= 0)
7928 warning (0, "right shift count >= width of type");
7932 /* Use the type of the value to be shifted. */
7933 result_type
= type0
;
7934 /* Convert the shift-count to an integer, regardless of size
7935 of value being shifted. */
7936 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1
)) != integer_type_node
)
7937 op1
= convert (integer_type_node
, op1
);
7938 /* Avoid converting op1 to result_type later. */
7944 if (code0
== INTEGER_TYPE
&& code1
== INTEGER_TYPE
)
7946 if (TREE_CODE (op1
) == INTEGER_CST
&& skip_evaluation
== 0)
7948 if (tree_int_cst_sgn (op1
) < 0)
7949 warning (0, "left shift count is negative");
7951 else if (compare_tree_int (op1
, TYPE_PRECISION (type0
)) >= 0)
7952 warning (0, "left shift count >= width of type");
7955 /* Use the type of the value to be shifted. */
7956 result_type
= type0
;
7957 /* Convert the shift-count to an integer, regardless of size
7958 of value being shifted. */
7959 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1
)) != integer_type_node
)
7960 op1
= convert (integer_type_node
, op1
);
7961 /* Avoid converting op1 to result_type later. */
7968 if (code0
== REAL_TYPE
|| code1
== REAL_TYPE
)
7969 warning (OPT_Wfloat_equal
,
7970 "comparing floating point with == or != is unsafe");
7971 /* Result of comparison is always int,
7972 but don't convert the args to int! */
7973 build_type
= integer_type_node
;
7974 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
7975 || code0
== COMPLEX_TYPE
)
7976 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
7977 || code1
== COMPLEX_TYPE
))
7979 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
7981 tree tt0
= TREE_TYPE (type0
);
7982 tree tt1
= TREE_TYPE (type1
);
7983 /* Anything compares with void *. void * compares with anything.
7984 Otherwise, the targets must be compatible
7985 and both must be object or both incomplete. */
7986 if (comp_target_types (type0
, type1
))
7987 result_type
= common_pointer_type (type0
, type1
);
7988 else if (VOID_TYPE_P (tt0
))
7990 /* op0 != orig_op0 detects the case of something
7991 whose value is 0 but which isn't a valid null ptr const. */
7992 if (pedantic
&& !null_pointer_constant_p (orig_op0
)
7993 && TREE_CODE (tt1
) == FUNCTION_TYPE
)
7994 pedwarn ("ISO C forbids comparison of %<void *%>"
7995 " with function pointer");
7997 else if (VOID_TYPE_P (tt1
))
7999 if (pedantic
&& !null_pointer_constant_p (orig_op1
)
8000 && TREE_CODE (tt0
) == FUNCTION_TYPE
)
8001 pedwarn ("ISO C forbids comparison of %<void *%>"
8002 " with function pointer");
8005 /* Avoid warning about the volatile ObjC EH puts on decls. */
8007 pedwarn ("comparison of distinct pointer types lacks a cast");
8009 if (result_type
== NULL_TREE
)
8010 result_type
= ptr_type_node
;
8012 else if (code0
== POINTER_TYPE
&& null_pointer_constant_p (orig_op1
))
8014 if (TREE_CODE (op0
) == ADDR_EXPR
8015 && DECL_P (TREE_OPERAND (op0
, 0))
8016 && !DECL_WEAK (TREE_OPERAND (op0
, 0)))
8017 warning (OPT_Walways_true
, "the address of %qD will never be NULL",
8018 TREE_OPERAND (op0
, 0));
8019 result_type
= type0
;
8021 else if (code1
== POINTER_TYPE
&& null_pointer_constant_p (orig_op0
))
8023 if (TREE_CODE (op1
) == ADDR_EXPR
8024 && DECL_P (TREE_OPERAND (op1
, 0))
8025 && !DECL_WEAK (TREE_OPERAND (op1
, 0)))
8026 warning (OPT_Walways_true
, "the address of %qD will never be NULL",
8027 TREE_OPERAND (op1
, 0));
8028 result_type
= type1
;
8030 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
8032 result_type
= type0
;
8033 pedwarn ("comparison between pointer and integer");
8035 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
8037 result_type
= type1
;
8038 pedwarn ("comparison between pointer and integer");
8046 build_type
= integer_type_node
;
8047 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
)
8048 && (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
))
8050 else if (code0
== POINTER_TYPE
&& code1
== POINTER_TYPE
)
8052 if (comp_target_types (type0
, type1
))
8054 result_type
= common_pointer_type (type0
, type1
);
8055 if (!COMPLETE_TYPE_P (TREE_TYPE (type0
))
8056 != !COMPLETE_TYPE_P (TREE_TYPE (type1
)))
8057 pedwarn ("comparison of complete and incomplete pointers");
8059 && TREE_CODE (TREE_TYPE (type0
)) == FUNCTION_TYPE
)
8060 pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
8064 result_type
= ptr_type_node
;
8065 pedwarn ("comparison of distinct pointer types lacks a cast");
8068 else if (code0
== POINTER_TYPE
&& null_pointer_constant_p (orig_op1
))
8070 result_type
= type0
;
8071 if (pedantic
|| extra_warnings
)
8072 pedwarn ("ordered comparison of pointer with integer zero");
8074 else if (code1
== POINTER_TYPE
&& null_pointer_constant_p (orig_op0
))
8076 result_type
= type1
;
8078 pedwarn ("ordered comparison of pointer with integer zero");
8080 else if (code0
== POINTER_TYPE
&& code1
== INTEGER_TYPE
)
8082 result_type
= type0
;
8083 pedwarn ("comparison between pointer and integer");
8085 else if (code0
== INTEGER_TYPE
&& code1
== POINTER_TYPE
)
8087 result_type
= type1
;
8088 pedwarn ("comparison between pointer and integer");
8096 if (code0
== ERROR_MARK
|| code1
== ERROR_MARK
)
8097 return error_mark_node
;
8099 if (code0
== VECTOR_TYPE
&& code1
== VECTOR_TYPE
8100 && (!tree_int_cst_equal (TYPE_SIZE (type0
), TYPE_SIZE (type1
))
8101 || !same_scalar_type_ignoring_signedness (TREE_TYPE (type0
),
8102 TREE_TYPE (type1
))))
8104 binary_op_error (code
);
8105 return error_mark_node
;
8108 if ((code0
== INTEGER_TYPE
|| code0
== REAL_TYPE
|| code0
== COMPLEX_TYPE
8109 || code0
== VECTOR_TYPE
)
8111 (code1
== INTEGER_TYPE
|| code1
== REAL_TYPE
|| code1
== COMPLEX_TYPE
8112 || code1
== VECTOR_TYPE
))
8114 int none_complex
= (code0
!= COMPLEX_TYPE
&& code1
!= COMPLEX_TYPE
);
8116 if (shorten
|| common
|| short_compare
)
8117 result_type
= c_common_type (type0
, type1
);
8119 /* For certain operations (which identify themselves by shorten != 0)
8120 if both args were extended from the same smaller type,
8121 do the arithmetic in that type and then extend.
8123 shorten !=0 and !=1 indicates a bitwise operation.
8124 For them, this optimization is safe only if
8125 both args are zero-extended or both are sign-extended.
8126 Otherwise, we might change the result.
8127 Eg, (short)-1 | (unsigned short)-1 is (int)-1
8128 but calculated in (unsigned short) it would be (unsigned short)-1. */
8130 if (shorten
&& none_complex
)
8132 int unsigned0
, unsigned1
;
8133 tree arg0
= get_narrower (op0
, &unsigned0
);
8134 tree arg1
= get_narrower (op1
, &unsigned1
);
8135 /* UNS is 1 if the operation to be done is an unsigned one. */
8136 int uns
= TYPE_UNSIGNED (result_type
);
8139 final_type
= result_type
;
8141 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
8142 but it *requires* conversion to FINAL_TYPE. */
8144 if ((TYPE_PRECISION (TREE_TYPE (op0
))
8145 == TYPE_PRECISION (TREE_TYPE (arg0
)))
8146 && TREE_TYPE (op0
) != final_type
)
8147 unsigned0
= TYPE_UNSIGNED (TREE_TYPE (op0
));
8148 if ((TYPE_PRECISION (TREE_TYPE (op1
))
8149 == TYPE_PRECISION (TREE_TYPE (arg1
)))
8150 && TREE_TYPE (op1
) != final_type
)
8151 unsigned1
= TYPE_UNSIGNED (TREE_TYPE (op1
));
8153 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
8155 /* For bitwise operations, signedness of nominal type
8156 does not matter. Consider only how operands were extended. */
8160 /* Note that in all three cases below we refrain from optimizing
8161 an unsigned operation on sign-extended args.
8162 That would not be valid. */
8164 /* Both args variable: if both extended in same way
8165 from same width, do it in that width.
8166 Do it unsigned if args were zero-extended. */
8167 if ((TYPE_PRECISION (TREE_TYPE (arg0
))
8168 < TYPE_PRECISION (result_type
))
8169 && (TYPE_PRECISION (TREE_TYPE (arg1
))
8170 == TYPE_PRECISION (TREE_TYPE (arg0
)))
8171 && unsigned0
== unsigned1
8172 && (unsigned0
|| !uns
))
8174 = c_common_signed_or_unsigned_type
8175 (unsigned0
, common_type (TREE_TYPE (arg0
), TREE_TYPE (arg1
)));
8176 else if (TREE_CODE (arg0
) == INTEGER_CST
8177 && (unsigned1
|| !uns
)
8178 && (TYPE_PRECISION (TREE_TYPE (arg1
))
8179 < TYPE_PRECISION (result_type
))
8181 = c_common_signed_or_unsigned_type (unsigned1
,
8183 int_fits_type_p (arg0
, type
)))
8185 else if (TREE_CODE (arg1
) == INTEGER_CST
8186 && (unsigned0
|| !uns
)
8187 && (TYPE_PRECISION (TREE_TYPE (arg0
))
8188 < TYPE_PRECISION (result_type
))
8190 = c_common_signed_or_unsigned_type (unsigned0
,
8192 int_fits_type_p (arg1
, type
)))
8196 /* Shifts can be shortened if shifting right. */
8201 tree arg0
= get_narrower (op0
, &unsigned_arg
);
8203 final_type
= result_type
;
8205 if (arg0
== op0
&& final_type
== TREE_TYPE (op0
))
8206 unsigned_arg
= TYPE_UNSIGNED (TREE_TYPE (op0
));
8208 if (TYPE_PRECISION (TREE_TYPE (arg0
)) < TYPE_PRECISION (result_type
)
8209 /* We can shorten only if the shift count is less than the
8210 number of bits in the smaller type size. */
8211 && compare_tree_int (op1
, TYPE_PRECISION (TREE_TYPE (arg0
))) < 0
8212 /* We cannot drop an unsigned shift after sign-extension. */
8213 && (!TYPE_UNSIGNED (final_type
) || unsigned_arg
))
8215 /* Do an unsigned shift if the operand was zero-extended. */
8217 = c_common_signed_or_unsigned_type (unsigned_arg
,
8219 /* Convert value-to-be-shifted to that type. */
8220 if (TREE_TYPE (op0
) != result_type
)
8221 op0
= convert (result_type
, op0
);
8226 /* Comparison operations are shortened too but differently.
8227 They identify themselves by setting short_compare = 1. */
8231 /* Don't write &op0, etc., because that would prevent op0
8232 from being kept in a register.
8233 Instead, make copies of the our local variables and
8234 pass the copies by reference, then copy them back afterward. */
8235 tree xop0
= op0
, xop1
= op1
, xresult_type
= result_type
;
8236 enum tree_code xresultcode
= resultcode
;
8238 = shorten_compare (&xop0
, &xop1
, &xresult_type
, &xresultcode
);
8243 op0
= xop0
, op1
= xop1
;
8245 resultcode
= xresultcode
;
8247 if (warn_sign_compare
&& skip_evaluation
== 0)
8249 int op0_signed
= !TYPE_UNSIGNED (TREE_TYPE (orig_op0
));
8250 int op1_signed
= !TYPE_UNSIGNED (TREE_TYPE (orig_op1
));
8251 int unsignedp0
, unsignedp1
;
8252 tree primop0
= get_narrower (op0
, &unsignedp0
);
8253 tree primop1
= get_narrower (op1
, &unsignedp1
);
8257 STRIP_TYPE_NOPS (xop0
);
8258 STRIP_TYPE_NOPS (xop1
);
8260 /* Give warnings for comparisons between signed and unsigned
8261 quantities that may fail.
8263 Do the checking based on the original operand trees, so that
8264 casts will be considered, but default promotions won't be.
8266 Do not warn if the comparison is being done in a signed type,
8267 since the signed type will only be chosen if it can represent
8268 all the values of the unsigned type. */
8269 if (!TYPE_UNSIGNED (result_type
))
8271 /* Do not warn if both operands are the same signedness. */
8272 else if (op0_signed
== op1_signed
)
8279 sop
= xop0
, uop
= xop1
;
8281 sop
= xop1
, uop
= xop0
;
8283 /* Do not warn if the signed quantity is an
8284 unsuffixed integer literal (or some static
8285 constant expression involving such literals or a
8286 conditional expression involving such literals)
8287 and it is non-negative. */
8288 if (tree_expr_nonnegative_p (sop
))
8290 /* Do not warn if the comparison is an equality operation,
8291 the unsigned quantity is an integral constant, and it
8292 would fit in the result if the result were signed. */
8293 else if (TREE_CODE (uop
) == INTEGER_CST
8294 && (resultcode
== EQ_EXPR
|| resultcode
== NE_EXPR
)
8296 (uop
, c_common_signed_type (result_type
)))
8298 /* Do not warn if the unsigned quantity is an enumeration
8299 constant and its maximum value would fit in the result
8300 if the result were signed. */
8301 else if (TREE_CODE (uop
) == INTEGER_CST
8302 && TREE_CODE (TREE_TYPE (uop
)) == ENUMERAL_TYPE
8304 (TYPE_MAX_VALUE (TREE_TYPE (uop
)),
8305 c_common_signed_type (result_type
)))
8308 warning (0, "comparison between signed and unsigned");
8311 /* Warn if two unsigned values are being compared in a size
8312 larger than their original size, and one (and only one) is the
8313 result of a `~' operator. This comparison will always fail.
8315 Also warn if one operand is a constant, and the constant
8316 does not have all bits set that are set in the ~ operand
8317 when it is extended. */
8319 if ((TREE_CODE (primop0
) == BIT_NOT_EXPR
)
8320 != (TREE_CODE (primop1
) == BIT_NOT_EXPR
))
8322 if (TREE_CODE (primop0
) == BIT_NOT_EXPR
)
8323 primop0
= get_narrower (TREE_OPERAND (primop0
, 0),
8326 primop1
= get_narrower (TREE_OPERAND (primop1
, 0),
8329 if (host_integerp (primop0
, 0) || host_integerp (primop1
, 0))
8332 HOST_WIDE_INT constant
, mask
;
8333 int unsignedp
, bits
;
8335 if (host_integerp (primop0
, 0))
8338 unsignedp
= unsignedp1
;
8339 constant
= tree_low_cst (primop0
, 0);
8344 unsignedp
= unsignedp0
;
8345 constant
= tree_low_cst (primop1
, 0);
8348 bits
= TYPE_PRECISION (TREE_TYPE (primop
));
8349 if (bits
< TYPE_PRECISION (result_type
)
8350 && bits
< HOST_BITS_PER_WIDE_INT
&& unsignedp
)
8352 mask
= (~(HOST_WIDE_INT
) 0) << bits
;
8353 if ((mask
& constant
) != mask
)
8354 warning (0, "comparison of promoted ~unsigned with constant");
8357 else if (unsignedp0
&& unsignedp1
8358 && (TYPE_PRECISION (TREE_TYPE (primop0
))
8359 < TYPE_PRECISION (result_type
))
8360 && (TYPE_PRECISION (TREE_TYPE (primop1
))
8361 < TYPE_PRECISION (result_type
)))
8362 warning (0, "comparison of promoted ~unsigned with unsigned");
8368 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
8369 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
8370 Then the expression will be built.
8371 It will be given type FINAL_TYPE if that is nonzero;
8372 otherwise, it will be given type RESULT_TYPE. */
8376 binary_op_error (code
);
8377 return error_mark_node
;
8382 if (TREE_TYPE (op0
) != result_type
)
8383 op0
= convert (result_type
, op0
);
8384 if (TREE_TYPE (op1
) != result_type
)
8385 op1
= convert (result_type
, op1
);
8387 /* This can happen if one operand has a vector type, and the other
8388 has a different type. */
8389 if (TREE_CODE (op0
) == ERROR_MARK
|| TREE_CODE (op1
) == ERROR_MARK
)
8390 return error_mark_node
;
8393 if (build_type
== NULL_TREE
)
8394 build_type
= result_type
;
8397 /* Treat expressions in initializers specially as they can't trap. */
8398 tree result
= require_constant_value
? fold_build2_initializer (resultcode
,
8401 : fold_build2 (resultcode
, build_type
,
8404 if (final_type
!= 0)
8405 result
= convert (final_type
, result
);
8411 /* Convert EXPR to be a truth-value, validating its type for this
8415 c_objc_common_truthvalue_conversion (tree expr
)
8417 switch (TREE_CODE (TREE_TYPE (expr
)))
8420 error ("used array that cannot be converted to pointer where scalar is required");
8421 return error_mark_node
;
8424 error ("used struct type value where scalar is required");
8425 return error_mark_node
;
8428 error ("used union type value where scalar is required");
8429 return error_mark_node
;
8438 /* ??? Should we also give an error for void and vectors rather than
8439 leaving those to give errors later? */
8440 return c_common_truthvalue_conversion (expr
);
8444 /* Convert EXPR to a contained DECL, updating *TC, *TI and *SE as
8448 c_expr_to_decl (tree expr
, bool *tc ATTRIBUTE_UNUSED
,
8449 bool *ti ATTRIBUTE_UNUSED
, bool *se
)
8451 if (TREE_CODE (expr
) == COMPOUND_LITERAL_EXPR
)
8453 tree decl
= COMPOUND_LITERAL_EXPR_DECL (expr
);
8454 /* Executing a compound literal inside a function reinitializes
8456 if (!TREE_STATIC (decl
))
8465 /* Like c_begin_compound_stmt, except force the retension of the BLOCK. */
8468 c_begin_omp_parallel (void)
8473 block
= c_begin_compound_stmt (true);
8479 c_finish_omp_parallel (tree clauses
, tree block
)
8483 block
= c_end_compound_stmt (block
, true);
8485 stmt
= make_node (OMP_PARALLEL
);
8486 TREE_TYPE (stmt
) = void_type_node
;
8487 OMP_PARALLEL_CLAUSES (stmt
) = clauses
;
8488 OMP_PARALLEL_BODY (stmt
) = block
;
8490 return add_stmt (stmt
);
8493 /* For all elements of CLAUSES, validate them vs OpenMP constraints.
8494 Remove any elements from the list that are invalid. */
8497 c_finish_omp_clauses (tree clauses
)
8499 bitmap_head generic_head
, firstprivate_head
, lastprivate_head
;
8500 tree c
, t
, *pc
= &clauses
;
8503 bitmap_obstack_initialize (NULL
);
8504 bitmap_initialize (&generic_head
, &bitmap_default_obstack
);
8505 bitmap_initialize (&firstprivate_head
, &bitmap_default_obstack
);
8506 bitmap_initialize (&lastprivate_head
, &bitmap_default_obstack
);
8508 for (pc
= &clauses
, c
= clauses
; c
; c
= *pc
)
8510 bool remove
= false;
8511 bool need_complete
= false;
8512 bool need_implicitly_determined
= false;
8514 switch (TREE_CODE (c
))
8516 case OMP_CLAUSE_SHARED
:
8518 need_implicitly_determined
= true;
8519 goto check_dup_generic
;
8521 case OMP_CLAUSE_PRIVATE
:
8523 need_complete
= true;
8524 need_implicitly_determined
= true;
8525 goto check_dup_generic
;
8527 case OMP_CLAUSE_REDUCTION
:
8529 need_implicitly_determined
= true;
8530 t
= OMP_CLAUSE_DECL (c
);
8531 if (AGGREGATE_TYPE_P (TREE_TYPE (t
))
8532 || POINTER_TYPE_P (TREE_TYPE (t
)))
8534 error ("%qE has invalid type for %<reduction%>", t
);
8537 else if (FLOAT_TYPE_P (TREE_TYPE (t
)))
8539 enum tree_code r_code
= OMP_CLAUSE_REDUCTION_CODE (c
);
8540 const char *r_name
= NULL
;
8557 case TRUTH_ANDIF_EXPR
:
8560 case TRUTH_ORIF_EXPR
:
8568 error ("%qE has invalid type for %<reduction(%s)%>",
8573 goto check_dup_generic
;
8575 case OMP_CLAUSE_COPYPRIVATE
:
8576 name
= "copyprivate";
8577 goto check_dup_generic
;
8579 case OMP_CLAUSE_COPYIN
:
8581 t
= OMP_CLAUSE_DECL (c
);
8582 if (TREE_CODE (t
) != VAR_DECL
|| !DECL_THREAD_LOCAL_P (t
))
8584 error ("%qE must be %<threadprivate%> for %<copyin%>", t
);
8587 goto check_dup_generic
;
8590 t
= OMP_CLAUSE_DECL (c
);
8591 if (TREE_CODE (t
) != VAR_DECL
&& TREE_CODE (t
) != PARM_DECL
)
8593 error ("%qE is not a variable in clause %qs", t
, name
);
8596 else if (bitmap_bit_p (&generic_head
, DECL_UID (t
))
8597 || bitmap_bit_p (&firstprivate_head
, DECL_UID (t
))
8598 || bitmap_bit_p (&lastprivate_head
, DECL_UID (t
)))
8600 error ("%qE appears more than once in data clauses", t
);
8604 bitmap_set_bit (&generic_head
, DECL_UID (t
));
8607 case OMP_CLAUSE_FIRSTPRIVATE
:
8608 name
= "firstprivate";
8609 t
= OMP_CLAUSE_DECL (c
);
8610 need_complete
= true;
8611 need_implicitly_determined
= true;
8612 if (TREE_CODE (t
) != VAR_DECL
&& TREE_CODE (t
) != PARM_DECL
)
8614 error ("%qE is not a variable in clause %<firstprivate%>", t
);
8617 else if (bitmap_bit_p (&generic_head
, DECL_UID (t
))
8618 || bitmap_bit_p (&firstprivate_head
, DECL_UID (t
)))
8620 error ("%qE appears more than once in data clauses", t
);
8624 bitmap_set_bit (&firstprivate_head
, DECL_UID (t
));
8627 case OMP_CLAUSE_LASTPRIVATE
:
8628 name
= "lastprivate";
8629 t
= OMP_CLAUSE_DECL (c
);
8630 need_complete
= true;
8631 need_implicitly_determined
= true;
8632 if (TREE_CODE (t
) != VAR_DECL
&& TREE_CODE (t
) != PARM_DECL
)
8634 error ("%qE is not a variable in clause %<lastprivate%>", t
);
8637 else if (bitmap_bit_p (&generic_head
, DECL_UID (t
))
8638 || bitmap_bit_p (&lastprivate_head
, DECL_UID (t
)))
8640 error ("%qE appears more than once in data clauses", t
);
8644 bitmap_set_bit (&lastprivate_head
, DECL_UID (t
));
8648 case OMP_CLAUSE_NUM_THREADS
:
8649 case OMP_CLAUSE_SCHEDULE
:
8650 case OMP_CLAUSE_NOWAIT
:
8651 case OMP_CLAUSE_ORDERED
:
8652 case OMP_CLAUSE_DEFAULT
:
8653 pc
= &OMP_CLAUSE_CHAIN (c
);
8662 t
= OMP_CLAUSE_DECL (c
);
8666 t
= require_complete_type (t
);
8667 if (t
== error_mark_node
)
8671 if (need_implicitly_determined
)
8673 const char *share_name
= NULL
;
8675 if (TREE_CODE (t
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (t
))
8676 share_name
= "threadprivate";
8677 else switch (c_omp_predetermined_sharing (t
))
8679 case OMP_CLAUSE_DEFAULT_UNSPECIFIED
:
8681 case OMP_CLAUSE_DEFAULT_SHARED
:
8682 share_name
= "shared";
8684 case OMP_CLAUSE_DEFAULT_PRIVATE
:
8685 share_name
= "private";
8692 error ("%qE is predetermined %qs for %qs",
8693 t
, share_name
, name
);
8700 *pc
= OMP_CLAUSE_CHAIN (c
);
8702 pc
= &OMP_CLAUSE_CHAIN (c
);
8705 bitmap_obstack_release (NULL
);