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 int spelling_length (void);
94 static char *print_spelling (char *);
95 static void warning_init (const char *);
96 static tree digest_init (tree, tree, bool, int);
97 static void output_init_element (tree, bool, tree, tree, int);
98 static void output_pending_init_elements (int);
99 static int set_designator (int);
100 static void push_range_stack (tree);
101 static void add_pending_init (tree, tree);
102 static void set_nonincremental_init (void);
103 static void set_nonincremental_init_from_string (tree);
104 static tree find_init_member (tree);
105 static void readonly_error (tree, enum lvalue_use);
106 static int lvalue_or_else (tree, enum lvalue_use);
107 static int lvalue_p (tree);
108 static void record_maybe_used_decl (tree);
109 static int comptypes_internal (tree, tree);
111 /* Return true if EXP is a null pointer constant, false otherwise. */
114 null_pointer_constant_p (tree expr)
116 /* This should really operate on c_expr structures, but they aren't
117 yet available everywhere required. */
118 tree type = TREE_TYPE (expr);
119 return (TREE_CODE (expr) == INTEGER_CST
120 && !TREE_CONSTANT_OVERFLOW (expr)
121 && integer_zerop (expr)
122 && (INTEGRAL_TYPE_P (type)
123 || (TREE_CODE (type) == POINTER_TYPE
124 && VOID_TYPE_P (TREE_TYPE (type))
125 && TYPE_QUALS (TREE_TYPE (type)) == TYPE_UNQUALIFIED)));
127 \f/* This is a cache to hold if two types are compatible or not. */
129 struct tagged_tu_seen_cache {
130 const struct tagged_tu_seen_cache * next;
133 /* The return value of tagged_types_tu_compatible_p if we had seen
134 these two types already. */
138 static const struct tagged_tu_seen_cache * tagged_tu_seen_base;
139 static void free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *);
141 /* Do `exp = require_complete_type (exp);' to make sure exp
142 does not have an incomplete type. (That includes void types.) */
145 require_complete_type (tree value)
147 tree type = TREE_TYPE (value);
149 if (value == error_mark_node || type == error_mark_node)
150 return error_mark_node;
152 /* First, detect a valid value with a complete type. */
153 if (COMPLETE_TYPE_P (type))
156 c_incomplete_type_error (value, type);
157 return error_mark_node;
160 /* Print an error message for invalid use of an incomplete type.
161 VALUE is the expression that was used (or 0 if that isn't known)
162 and TYPE is the type that was invalid. */
165 c_incomplete_type_error (tree value, tree type)
167 const char *type_code_string;
169 /* Avoid duplicate error message. */
170 if (TREE_CODE (type) == ERROR_MARK)
173 if (value != 0 && (TREE_CODE (value) == VAR_DECL
174 || TREE_CODE (value) == PARM_DECL))
175 error ("%qD has an incomplete type", value);
179 /* We must print an error message. Be clever about what it says. */
181 switch (TREE_CODE (type))
184 type_code_string = "struct";
188 type_code_string = "union";
192 type_code_string = "enum";
196 error ("invalid use of void expression");
200 if (TYPE_DOMAIN (type))
202 if (TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL)
204 error ("invalid use of flexible array member");
207 type = TREE_TYPE (type);
210 error ("invalid use of array with unspecified bounds");
217 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
218 error ("invalid use of undefined type %<%s %E%>",
219 type_code_string, TYPE_NAME (type));
221 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
222 error ("invalid use of incomplete typedef %qD", TYPE_NAME (type));
226 /* Given a type, apply default promotions wrt unnamed function
227 arguments and return the new type. */
230 c_type_promotes_to (tree type)
232 if (TYPE_MAIN_VARIANT (type) == float_type_node)
233 return double_type_node;
235 if (c_promoting_integer_type_p (type))
237 /* Preserve unsignedness if not really getting any wider. */
238 if (TYPE_UNSIGNED (type)
239 && (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
240 return unsigned_type_node;
241 return integer_type_node;
247 /* Return a variant of TYPE which has all the type qualifiers of LIKE
248 as well as those of TYPE. */
251 qualify_type (tree type, tree like)
253 return c_build_qualified_type (type,
254 TYPE_QUALS (type) | TYPE_QUALS (like));
257 /* Return true iff the given tree T is a variable length array. */
260 c_vla_type_p (tree t)
262 if (TREE_CODE (t) == ARRAY_TYPE
263 && C_TYPE_VARIABLE_SIZE (t))
268 /* Return the composite type of two compatible types.
270 We assume that comptypes has already been done and returned
271 nonzero; if that isn't so, this may crash. In particular, we
272 assume that qualifiers match. */
275 composite_type (tree t1, tree t2)
277 enum tree_code code1;
278 enum tree_code code2;
281 /* Save time if the two types are the same. */
283 if (t1 == t2) return t1;
285 /* If one type is nonsense, use the other. */
286 if (t1 == error_mark_node)
288 if (t2 == error_mark_node)
291 code1 = TREE_CODE (t1);
292 code2 = TREE_CODE (t2);
294 /* Merge the attributes. */
295 attributes = targetm.merge_type_attributes (t1, t2);
297 /* If one is an enumerated type and the other is the compatible
298 integer type, the composite type might be either of the two
299 (DR#013 question 3). For consistency, use the enumerated type as
300 the composite type. */
302 if (code1 == ENUMERAL_TYPE && code2 == INTEGER_TYPE)
304 if (code2 == ENUMERAL_TYPE && code1 == INTEGER_TYPE)
307 gcc_assert (code1 == code2);
312 /* For two pointers, do this recursively on the target type. */
314 tree pointed_to_1 = TREE_TYPE (t1);
315 tree pointed_to_2 = TREE_TYPE (t2);
316 tree target = composite_type (pointed_to_1, pointed_to_2);
317 t1 = build_pointer_type (target);
318 t1 = build_type_attribute_variant (t1, attributes);
319 return qualify_type (t1, t2);
324 tree elt = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
327 tree d1 = TYPE_DOMAIN (t1);
328 tree d2 = TYPE_DOMAIN (t2);
329 bool d1_variable, d2_variable;
330 bool d1_zero, d2_zero;
332 /* We should not have any type quals on arrays at all. */
333 gcc_assert (!TYPE_QUALS (t1) && !TYPE_QUALS (t2));
335 d1_zero = d1 == 0 || !TYPE_MAX_VALUE (d1);
336 d2_zero = d2 == 0 || !TYPE_MAX_VALUE (d2);
338 d1_variable = (!d1_zero
339 && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
340 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST));
341 d2_variable = (!d2_zero
342 && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
343 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST));
344 d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1));
345 d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2));
347 /* Save space: see if the result is identical to one of the args. */
348 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)
349 && (d2_variable || d2_zero || !d1_variable))
350 return build_type_attribute_variant (t1, attributes);
351 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)
352 && (d1_variable || d1_zero || !d2_variable))
353 return build_type_attribute_variant (t2, attributes);
355 if (elt == TREE_TYPE (t1) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1))
356 return build_type_attribute_variant (t1, attributes);
357 if (elt == TREE_TYPE (t2) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1))
358 return build_type_attribute_variant (t2, attributes);
360 /* Merge the element types, and have a size if either arg has
361 one. We may have qualifiers on the element types. To set
362 up TYPE_MAIN_VARIANT correctly, we need to form the
363 composite of the unqualified types and add the qualifiers
365 quals = TYPE_QUALS (strip_array_types (elt));
366 unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED);
367 t1 = build_array_type (unqual_elt,
368 TYPE_DOMAIN ((TYPE_DOMAIN (t1)
374 t1 = c_build_qualified_type (t1, quals);
375 return build_type_attribute_variant (t1, attributes);
381 if (attributes != NULL)
383 /* Try harder not to create a new aggregate type. */
384 if (attribute_list_equal (TYPE_ATTRIBUTES (t1), attributes))
386 if (attribute_list_equal (TYPE_ATTRIBUTES (t2), attributes))
389 return build_type_attribute_variant (t1, attributes);
392 /* Function types: prefer the one that specified arg types.
393 If both do, merge the arg types. Also merge the return types. */
395 tree valtype = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
396 tree p1 = TYPE_ARG_TYPES (t1);
397 tree p2 = TYPE_ARG_TYPES (t2);
402 /* Save space: see if the result is identical to one of the args. */
403 if (valtype == TREE_TYPE (t1) && !TYPE_ARG_TYPES (t2))
404 return build_type_attribute_variant (t1, attributes);
405 if (valtype == TREE_TYPE (t2) && !TYPE_ARG_TYPES (t1))
406 return build_type_attribute_variant (t2, attributes);
408 /* Simple way if one arg fails to specify argument types. */
409 if (TYPE_ARG_TYPES (t1) == 0)
411 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2));
412 t1 = build_type_attribute_variant (t1, attributes);
413 return qualify_type (t1, t2);
415 if (TYPE_ARG_TYPES (t2) == 0)
417 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1));
418 t1 = build_type_attribute_variant (t1, attributes);
419 return qualify_type (t1, t2);
422 /* If both args specify argument types, we must merge the two
423 lists, argument by argument. */
424 /* Tell global_bindings_p to return false so that variable_size
425 doesn't die on VLAs in parameter types. */
426 c_override_global_bindings_to_false = true;
428 len = list_length (p1);
431 for (i = 0; i < len; i++)
432 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
437 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n))
439 /* A null type means arg type is not specified.
440 Take whatever the other function type has. */
441 if (TREE_VALUE (p1) == 0)
443 TREE_VALUE (n) = TREE_VALUE (p2);
446 if (TREE_VALUE (p2) == 0)
448 TREE_VALUE (n) = TREE_VALUE (p1);
452 /* Given wait (union {union wait *u; int *i} *)
453 and wait (union wait *),
454 prefer union wait * as type of parm. */
455 if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE
456 && TREE_VALUE (p1) != TREE_VALUE (p2))
459 tree mv2 = TREE_VALUE (p2);
460 if (mv2 && mv2 != error_mark_node
461 && TREE_CODE (mv2) != ARRAY_TYPE)
462 mv2 = TYPE_MAIN_VARIANT (mv2);
463 for (memb = TYPE_FIELDS (TREE_VALUE (p1));
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, mv2))
472 TREE_VALUE (n) = composite_type (TREE_TYPE (memb),
475 pedwarn ("function types not truly compatible in ISO C");
480 if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE
481 && TREE_VALUE (p2) != TREE_VALUE (p1))
484 tree mv1 = TREE_VALUE (p1);
485 if (mv1 && mv1 != error_mark_node
486 && TREE_CODE (mv1) != ARRAY_TYPE)
487 mv1 = TYPE_MAIN_VARIANT (mv1);
488 for (memb = TYPE_FIELDS (TREE_VALUE (p2));
489 memb; memb = TREE_CHAIN (memb))
491 tree mv3 = TREE_TYPE (memb);
492 if (mv3 && mv3 != error_mark_node
493 && TREE_CODE (mv3) != ARRAY_TYPE)
494 mv3 = TYPE_MAIN_VARIANT (mv3);
495 if (comptypes (mv3, mv1))
497 TREE_VALUE (n) = composite_type (TREE_TYPE (memb),
500 pedwarn ("function types not truly compatible in ISO C");
505 TREE_VALUE (n) = composite_type (TREE_VALUE (p1), TREE_VALUE (p2));
509 c_override_global_bindings_to_false = false;
510 t1 = build_function_type (valtype, newargs);
511 t1 = qualify_type (t1, t2);
512 /* ... falls through ... */
516 return build_type_attribute_variant (t1, attributes);
521 /* Return the type of a conditional expression between pointers to
522 possibly differently qualified versions of compatible types.
524 We assume that comp_target_types has already been done and returned
525 nonzero; if that isn't so, this may crash. */
528 common_pointer_type (tree t1, tree t2)
531 tree pointed_to_1, mv1;
532 tree pointed_to_2, mv2;
535 /* Save time if the two types are the same. */
537 if (t1 == t2) return t1;
539 /* If one type is nonsense, use the other. */
540 if (t1 == error_mark_node)
542 if (t2 == error_mark_node)
545 gcc_assert (TREE_CODE (t1) == POINTER_TYPE
546 && TREE_CODE (t2) == POINTER_TYPE);
548 /* Merge the attributes. */
549 attributes = targetm.merge_type_attributes (t1, t2);
551 /* Find the composite type of the target types, and combine the
552 qualifiers of the two types' targets. Do not lose qualifiers on
553 array element types by taking the TYPE_MAIN_VARIANT. */
554 mv1 = pointed_to_1 = TREE_TYPE (t1);
555 mv2 = pointed_to_2 = TREE_TYPE (t2);
556 if (TREE_CODE (mv1) != ARRAY_TYPE)
557 mv1 = TYPE_MAIN_VARIANT (pointed_to_1);
558 if (TREE_CODE (mv2) != ARRAY_TYPE)
559 mv2 = TYPE_MAIN_VARIANT (pointed_to_2);
560 target = composite_type (mv1, mv2);
561 t1 = build_pointer_type (c_build_qualified_type
563 TYPE_QUALS (pointed_to_1) |
564 TYPE_QUALS (pointed_to_2)));
565 return build_type_attribute_variant (t1, attributes);
568 /* Return the common type for two arithmetic types under the usual
569 arithmetic conversions. The default conversions have already been
570 applied, and enumerated types converted to their compatible integer
571 types. The resulting type is unqualified and has no attributes.
573 This is the type for the result of most arithmetic operations
574 if the operands have the given two types. */
577 c_common_type (tree t1, tree t2)
579 enum tree_code code1;
580 enum tree_code code2;
582 /* If one type is nonsense, use the other. */
583 if (t1 == error_mark_node)
585 if (t2 == error_mark_node)
588 if (TYPE_QUALS (t1) != TYPE_UNQUALIFIED)
589 t1 = TYPE_MAIN_VARIANT (t1);
591 if (TYPE_QUALS (t2) != TYPE_UNQUALIFIED)
592 t2 = TYPE_MAIN_VARIANT (t2);
594 if (TYPE_ATTRIBUTES (t1) != NULL_TREE)
595 t1 = build_type_attribute_variant (t1, NULL_TREE);
597 if (TYPE_ATTRIBUTES (t2) != NULL_TREE)
598 t2 = build_type_attribute_variant (t2, NULL_TREE);
600 /* Save time if the two types are the same. */
602 if (t1 == t2) return t1;
604 code1 = TREE_CODE (t1);
605 code2 = TREE_CODE (t2);
607 gcc_assert (code1 == VECTOR_TYPE || code1 == COMPLEX_TYPE
608 || code1 == REAL_TYPE || code1 == INTEGER_TYPE);
609 gcc_assert (code2 == VECTOR_TYPE || code2 == COMPLEX_TYPE
610 || code2 == REAL_TYPE || code2 == INTEGER_TYPE);
612 /* When one operand is a decimal float type, the other operand cannot be
613 a generic float type or a complex type. We also disallow vector types
615 if ((DECIMAL_FLOAT_TYPE_P (t1) || DECIMAL_FLOAT_TYPE_P (t2))
616 && !(DECIMAL_FLOAT_TYPE_P (t1) && DECIMAL_FLOAT_TYPE_P (t2)))
618 if (code1 == VECTOR_TYPE || code2 == VECTOR_TYPE)
620 error ("can%'t mix operands of decimal float and vector types");
621 return error_mark_node;
623 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
625 error ("can%'t mix operands of decimal float and complex types");
626 return error_mark_node;
628 if (code1 == REAL_TYPE && code2 == REAL_TYPE)
630 error ("can%'t mix operands of decimal float and other float types");
631 return error_mark_node;
635 /* If one type is a vector type, return that type. (How the usual
636 arithmetic conversions apply to the vector types extension is not
637 precisely specified.) */
638 if (code1 == VECTOR_TYPE)
641 if (code2 == VECTOR_TYPE)
644 /* If one type is complex, form the common type of the non-complex
645 components, then make that complex. Use T1 or T2 if it is the
647 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
649 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
650 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
651 tree subtype = c_common_type (subtype1, subtype2);
653 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
655 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
658 return build_complex_type (subtype);
661 /* If only one is real, use it as the result. */
663 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
666 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
669 /* If both are real and either are decimal floating point types, use
670 the decimal floating point type with the greater precision. */
672 if (code1 == REAL_TYPE && code2 == REAL_TYPE)
674 if (TYPE_MAIN_VARIANT (t1) == dfloat128_type_node
675 || TYPE_MAIN_VARIANT (t2) == dfloat128_type_node)
676 return dfloat128_type_node;
677 else if (TYPE_MAIN_VARIANT (t1) == dfloat64_type_node
678 || TYPE_MAIN_VARIANT (t2) == dfloat64_type_node)
679 return dfloat64_type_node;
680 else if (TYPE_MAIN_VARIANT (t1) == dfloat32_type_node
681 || TYPE_MAIN_VARIANT (t2) == dfloat32_type_node)
682 return dfloat32_type_node;
685 /* Both real or both integers; use the one with greater precision. */
687 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
689 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
692 /* Same precision. Prefer long longs to longs to ints when the
693 same precision, following the C99 rules on integer type rank
694 (which are equivalent to the C90 rules for C90 types). */
696 if (TYPE_MAIN_VARIANT (t1) == long_long_unsigned_type_node
697 || TYPE_MAIN_VARIANT (t2) == long_long_unsigned_type_node)
698 return long_long_unsigned_type_node;
700 if (TYPE_MAIN_VARIANT (t1) == long_long_integer_type_node
701 || TYPE_MAIN_VARIANT (t2) == long_long_integer_type_node)
703 if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
704 return long_long_unsigned_type_node;
706 return long_long_integer_type_node;
709 if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
710 || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
711 return long_unsigned_type_node;
713 if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
714 || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
716 /* But preserve unsignedness from the other type,
717 since long cannot hold all the values of an unsigned int. */
718 if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
719 return long_unsigned_type_node;
721 return long_integer_type_node;
724 /* Likewise, prefer long double to double even if same size. */
725 if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
726 || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
727 return long_double_type_node;
729 /* Otherwise prefer the unsigned one. */
731 if (TYPE_UNSIGNED (t1))
737 /* Wrapper around c_common_type that is used by c-common.c and other
738 front end optimizations that remove promotions. ENUMERAL_TYPEs
739 are allowed here and are converted to their compatible integer types.
740 BOOLEAN_TYPEs are allowed here and return either boolean_type_node or
741 preferably a non-Boolean type as the common type. */
743 common_type (tree t1, tree t2)
745 if (TREE_CODE (t1) == ENUMERAL_TYPE)
746 t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1);
747 if (TREE_CODE (t2) == ENUMERAL_TYPE)
748 t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1);
750 /* If both types are BOOLEAN_TYPE, then return boolean_type_node. */
751 if (TREE_CODE (t1) == BOOLEAN_TYPE
752 && TREE_CODE (t2) == BOOLEAN_TYPE)
753 return boolean_type_node;
755 /* If either type is BOOLEAN_TYPE, then return the other. */
756 if (TREE_CODE (t1) == BOOLEAN_TYPE)
758 if (TREE_CODE (t2) == BOOLEAN_TYPE)
761 return c_common_type (t1, t2);
764 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
765 or various other operations. Return 2 if they are compatible
766 but a warning may be needed if you use them together. */
769 comptypes (tree type1, tree type2)
771 const struct tagged_tu_seen_cache * tagged_tu_seen_base1 = tagged_tu_seen_base;
774 val = comptypes_internal (type1, type2);
775 free_all_tagged_tu_seen_up_to (tagged_tu_seen_base1);
780 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
781 or various other operations. Return 2 if they are compatible
782 but a warning may be needed if you use them together. This
783 differs from comptypes, in that we don't free the seen types. */
786 comptypes_internal (tree type1, tree type2)
792 /* Suppress errors caused by previously reported errors. */
794 if (t1 == t2 || !t1 || !t2
795 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK)
798 /* If either type is the internal version of sizetype, return the
800 if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1)
801 && TYPE_ORIG_SIZE_TYPE (t1))
802 t1 = TYPE_ORIG_SIZE_TYPE (t1);
804 if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2)
805 && TYPE_ORIG_SIZE_TYPE (t2))
806 t2 = TYPE_ORIG_SIZE_TYPE (t2);
809 /* Enumerated types are compatible with integer types, but this is
810 not transitive: two enumerated types in the same translation unit
811 are compatible with each other only if they are the same type. */
813 if (TREE_CODE (t1) == ENUMERAL_TYPE && TREE_CODE (t2) != ENUMERAL_TYPE)
814 t1 = c_common_type_for_size (TYPE_PRECISION (t1), TYPE_UNSIGNED (t1));
815 else if (TREE_CODE (t2) == ENUMERAL_TYPE && TREE_CODE (t1) != ENUMERAL_TYPE)
816 t2 = c_common_type_for_size (TYPE_PRECISION (t2), TYPE_UNSIGNED (t2));
821 /* Different classes of types can't be compatible. */
823 if (TREE_CODE (t1) != TREE_CODE (t2))
826 /* Qualifiers must match. C99 6.7.3p9 */
828 if (TYPE_QUALS (t1) != TYPE_QUALS (t2))
831 /* Allow for two different type nodes which have essentially the same
832 definition. Note that we already checked for equality of the type
833 qualifiers (just above). */
835 if (TREE_CODE (t1) != ARRAY_TYPE
836 && TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
839 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
840 if (!(attrval = targetm.comp_type_attributes (t1, t2)))
843 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
846 switch (TREE_CODE (t1))
849 /* Do not remove mode or aliasing information. */
850 if (TYPE_MODE (t1) != TYPE_MODE (t2)
851 || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2))
853 val = (TREE_TYPE (t1) == TREE_TYPE (t2)
854 ? 1 : comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2)));
858 val = function_types_compatible_p (t1, t2);
863 tree d1 = TYPE_DOMAIN (t1);
864 tree d2 = TYPE_DOMAIN (t2);
865 bool d1_variable, d2_variable;
866 bool d1_zero, d2_zero;
869 /* Target types must match incl. qualifiers. */
870 if (TREE_TYPE (t1) != TREE_TYPE (t2)
871 && 0 == (val = comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2))))
874 /* Sizes must match unless one is missing or variable. */
875 if (d1 == 0 || d2 == 0 || d1 == d2)
878 d1_zero = !TYPE_MAX_VALUE (d1);
879 d2_zero = !TYPE_MAX_VALUE (d2);
881 d1_variable = (!d1_zero
882 && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
883 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST));
884 d2_variable = (!d2_zero
885 && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
886 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST));
887 d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1));
888 d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2));
890 if (d1_variable || d2_variable)
892 if (d1_zero && d2_zero)
894 if (d1_zero || d2_zero
895 || !tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2))
896 || !tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2)))
905 if (val != 1 && !same_translation_unit_p (t1, t2))
907 tree a1 = TYPE_ATTRIBUTES (t1);
908 tree a2 = TYPE_ATTRIBUTES (t2);
910 if (! attribute_list_contained (a1, a2)
911 && ! attribute_list_contained (a2, a1))
915 return tagged_types_tu_compatible_p (t1, t2);
916 val = tagged_types_tu_compatible_p (t1, t2);
921 val = TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2)
922 && comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2));
928 return attrval == 2 && val == 1 ? 2 : val;
931 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
932 ignoring their qualifiers. */
935 comp_target_types (tree ttl, tree ttr)
940 /* Do not lose qualifiers on element types of array types that are
941 pointer targets by taking their TYPE_MAIN_VARIANT. */
942 mvl = TREE_TYPE (ttl);
943 mvr = TREE_TYPE (ttr);
944 if (TREE_CODE (mvl) != ARRAY_TYPE)
945 mvl = TYPE_MAIN_VARIANT (mvl);
946 if (TREE_CODE (mvr) != ARRAY_TYPE)
947 mvr = TYPE_MAIN_VARIANT (mvr);
948 val = comptypes (mvl, mvr);
950 if (val == 2 && pedantic)
951 pedwarn ("types are not quite compatible");
955 /* Subroutines of `comptypes'. */
957 /* Determine whether two trees derive from the same translation unit.
958 If the CONTEXT chain ends in a null, that tree's context is still
959 being parsed, so if two trees have context chains ending in null,
960 they're in the same translation unit. */
962 same_translation_unit_p (tree t1, tree t2)
964 while (t1 && TREE_CODE (t1) != TRANSLATION_UNIT_DECL)
965 switch (TREE_CODE_CLASS (TREE_CODE (t1)))
967 case tcc_declaration:
968 t1 = DECL_CONTEXT (t1); break;
970 t1 = TYPE_CONTEXT (t1); break;
971 case tcc_exceptional:
972 t1 = BLOCK_SUPERCONTEXT (t1); break; /* assume block */
973 default: gcc_unreachable ();
976 while (t2 && TREE_CODE (t2) != TRANSLATION_UNIT_DECL)
977 switch (TREE_CODE_CLASS (TREE_CODE (t2)))
979 case tcc_declaration:
980 t2 = DECL_CONTEXT (t2); break;
982 t2 = TYPE_CONTEXT (t2); break;
983 case tcc_exceptional:
984 t2 = BLOCK_SUPERCONTEXT (t2); break; /* assume block */
985 default: gcc_unreachable ();
991 /* Allocate the seen two types, assuming that they are compatible. */
993 static struct tagged_tu_seen_cache *
994 alloc_tagged_tu_seen_cache (tree t1, tree t2)
996 struct tagged_tu_seen_cache *tu = XNEW (struct tagged_tu_seen_cache);
997 tu->next = tagged_tu_seen_base;
1001 tagged_tu_seen_base = tu;
1003 /* The C standard says that two structures in different translation
1004 units are compatible with each other only if the types of their
1005 fields are compatible (among other things). We assume that they
1006 are compatible until proven otherwise when building the cache.
1007 An example where this can occur is:
1012 If we are comparing this against a similar struct in another TU,
1013 and did not assume they were compatible, we end up with an infinite
1019 /* Free the seen types until we get to TU_TIL. */
1022 free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *tu_til)
1024 const struct tagged_tu_seen_cache *tu = tagged_tu_seen_base;
1025 while (tu != tu_til)
1027 struct tagged_tu_seen_cache *tu1 = (struct tagged_tu_seen_cache*)tu;
1031 tagged_tu_seen_base = tu_til;
1034 /* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are
1035 compatible. If the two types are not the same (which has been
1036 checked earlier), this can only happen when multiple translation
1037 units are being compiled. See C99 6.2.7 paragraph 1 for the exact
1041 tagged_types_tu_compatible_p (tree t1, tree t2)
1044 bool needs_warning = false;
1046 /* We have to verify that the tags of the types are the same. This
1047 is harder than it looks because this may be a typedef, so we have
1048 to go look at the original type. It may even be a typedef of a
1050 In the case of compiler-created builtin structs the TYPE_DECL
1051 may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */
1052 while (TYPE_NAME (t1)
1053 && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
1054 && DECL_ORIGINAL_TYPE (TYPE_NAME (t1)))
1055 t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1));
1057 while (TYPE_NAME (t2)
1058 && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL
1059 && DECL_ORIGINAL_TYPE (TYPE_NAME (t2)))
1060 t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2));
1062 /* C90 didn't have the requirement that the two tags be the same. */
1063 if (flag_isoc99 && TYPE_NAME (t1) != TYPE_NAME (t2))
1066 /* C90 didn't say what happened if one or both of the types were
1067 incomplete; we choose to follow C99 rules here, which is that they
1069 if (TYPE_SIZE (t1) == NULL
1070 || TYPE_SIZE (t2) == NULL)
1074 const struct tagged_tu_seen_cache * tts_i;
1075 for (tts_i = tagged_tu_seen_base; tts_i != NULL; tts_i = tts_i->next)
1076 if (tts_i->t1 == t1 && tts_i->t2 == t2)
1080 switch (TREE_CODE (t1))
1084 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1085 /* Speed up the case where the type values are in the same order. */
1086 tree tv1 = TYPE_VALUES (t1);
1087 tree tv2 = TYPE_VALUES (t2);
1094 for (;tv1 && tv2; tv1 = TREE_CHAIN (tv1), tv2 = TREE_CHAIN (tv2))
1096 if (TREE_PURPOSE (tv1) != TREE_PURPOSE (tv2))
1098 if (simple_cst_equal (TREE_VALUE (tv1), TREE_VALUE (tv2)) != 1)
1105 if (tv1 == NULL_TREE && tv2 == NULL_TREE)
1109 if (tv1 == NULL_TREE || tv2 == NULL_TREE)
1115 if (list_length (TYPE_VALUES (t1)) != list_length (TYPE_VALUES (t2)))
1121 for (s1 = TYPE_VALUES (t1); s1; s1 = TREE_CHAIN (s1))
1123 s2 = purpose_member (TREE_PURPOSE (s1), TYPE_VALUES (t2));
1125 || simple_cst_equal (TREE_VALUE (s1), TREE_VALUE (s2)) != 1)
1136 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1137 if (list_length (TYPE_FIELDS (t1)) != list_length (TYPE_FIELDS (t2)))
1143 /* Speed up the common case where the fields are in the same order. */
1144 for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2); s1 && s2;
1145 s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2))
1150 if (DECL_NAME (s1) == NULL
1151 || DECL_NAME (s1) != DECL_NAME (s2))
1153 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1160 needs_warning = true;
1162 if (TREE_CODE (s1) == FIELD_DECL
1163 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1164 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1172 tu->val = needs_warning ? 2 : 1;
1176 for (s1 = TYPE_FIELDS (t1); s1; s1 = TREE_CHAIN (s1))
1180 if (DECL_NAME (s1) != NULL)
1181 for (s2 = TYPE_FIELDS (t2); s2; s2 = TREE_CHAIN (s2))
1182 if (DECL_NAME (s1) == DECL_NAME (s2))
1185 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1192 needs_warning = true;
1194 if (TREE_CODE (s1) == FIELD_DECL
1195 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1196 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1208 tu->val = needs_warning ? 2 : 10;
1214 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1216 for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2);
1218 s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2))
1221 if (TREE_CODE (s1) != TREE_CODE (s2)
1222 || DECL_NAME (s1) != DECL_NAME (s2))
1224 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1228 needs_warning = true;
1230 if (TREE_CODE (s1) == FIELD_DECL
1231 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1232 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1238 tu->val = needs_warning ? 2 : 1;
1247 /* Return 1 if two function types F1 and F2 are compatible.
1248 If either type specifies no argument types,
1249 the other must specify a fixed number of self-promoting arg types.
1250 Otherwise, if one type specifies only the number of arguments,
1251 the other must specify that number of self-promoting arg types.
1252 Otherwise, the argument types must match. */
1255 function_types_compatible_p (tree f1, tree f2)
1258 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1263 ret1 = TREE_TYPE (f1);
1264 ret2 = TREE_TYPE (f2);
1266 /* 'volatile' qualifiers on a function's return type used to mean
1267 the function is noreturn. */
1268 if (TYPE_VOLATILE (ret1) != TYPE_VOLATILE (ret2))
1269 pedwarn ("function return types not compatible due to %<volatile%>");
1270 if (TYPE_VOLATILE (ret1))
1271 ret1 = build_qualified_type (TYPE_MAIN_VARIANT (ret1),
1272 TYPE_QUALS (ret1) & ~TYPE_QUAL_VOLATILE);
1273 if (TYPE_VOLATILE (ret2))
1274 ret2 = build_qualified_type (TYPE_MAIN_VARIANT (ret2),
1275 TYPE_QUALS (ret2) & ~TYPE_QUAL_VOLATILE);
1276 val = comptypes_internal (ret1, ret2);
1280 args1 = TYPE_ARG_TYPES (f1);
1281 args2 = TYPE_ARG_TYPES (f2);
1283 /* An unspecified parmlist matches any specified parmlist
1284 whose argument types don't need default promotions. */
1288 if (!self_promoting_args_p (args2))
1290 /* If one of these types comes from a non-prototype fn definition,
1291 compare that with the other type's arglist.
1292 If they don't match, ask for a warning (but no error). */
1293 if (TYPE_ACTUAL_ARG_TYPES (f1)
1294 && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1)))
1300 if (!self_promoting_args_p (args1))
1302 if (TYPE_ACTUAL_ARG_TYPES (f2)
1303 && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2)))
1308 /* Both types have argument lists: compare them and propagate results. */
1309 val1 = type_lists_compatible_p (args1, args2);
1310 return val1 != 1 ? val1 : val;
1313 /* Check two lists of types for compatibility,
1314 returning 0 for incompatible, 1 for compatible,
1315 or 2 for compatible with warning. */
1318 type_lists_compatible_p (tree args1, tree args2)
1320 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1326 tree a1, mv1, a2, mv2;
1327 if (args1 == 0 && args2 == 0)
1329 /* If one list is shorter than the other,
1330 they fail to match. */
1331 if (args1 == 0 || args2 == 0)
1333 mv1 = a1 = TREE_VALUE (args1);
1334 mv2 = a2 = TREE_VALUE (args2);
1335 if (mv1 && mv1 != error_mark_node && TREE_CODE (mv1) != ARRAY_TYPE)
1336 mv1 = TYPE_MAIN_VARIANT (mv1);
1337 if (mv2 && mv2 != error_mark_node && TREE_CODE (mv2) != ARRAY_TYPE)
1338 mv2 = TYPE_MAIN_VARIANT (mv2);
1339 /* A null pointer instead of a type
1340 means there is supposed to be an argument
1341 but nothing is specified about what type it has.
1342 So match anything that self-promotes. */
1345 if (c_type_promotes_to (a2) != a2)
1350 if (c_type_promotes_to (a1) != a1)
1353 /* If one of the lists has an error marker, ignore this arg. */
1354 else if (TREE_CODE (a1) == ERROR_MARK
1355 || TREE_CODE (a2) == ERROR_MARK)
1357 else if (!(newval = comptypes_internal (mv1, mv2)))
1359 /* Allow wait (union {union wait *u; int *i} *)
1360 and wait (union wait *) to be compatible. */
1361 if (TREE_CODE (a1) == UNION_TYPE
1362 && (TYPE_NAME (a1) == 0
1363 || TYPE_TRANSPARENT_UNION (a1))
1364 && TREE_CODE (TYPE_SIZE (a1)) == INTEGER_CST
1365 && tree_int_cst_equal (TYPE_SIZE (a1),
1369 for (memb = TYPE_FIELDS (a1);
1370 memb; memb = TREE_CHAIN (memb))
1372 tree mv3 = TREE_TYPE (memb);
1373 if (mv3 && mv3 != error_mark_node
1374 && TREE_CODE (mv3) != ARRAY_TYPE)
1375 mv3 = TYPE_MAIN_VARIANT (mv3);
1376 if (comptypes_internal (mv3, mv2))
1382 else if (TREE_CODE (a2) == UNION_TYPE
1383 && (TYPE_NAME (a2) == 0
1384 || TYPE_TRANSPARENT_UNION (a2))
1385 && TREE_CODE (TYPE_SIZE (a2)) == INTEGER_CST
1386 && tree_int_cst_equal (TYPE_SIZE (a2),
1390 for (memb = TYPE_FIELDS (a2);
1391 memb; memb = TREE_CHAIN (memb))
1393 tree mv3 = TREE_TYPE (memb);
1394 if (mv3 && mv3 != error_mark_node
1395 && TREE_CODE (mv3) != ARRAY_TYPE)
1396 mv3 = TYPE_MAIN_VARIANT (mv3);
1397 if (comptypes_internal (mv3, mv1))
1407 /* comptypes said ok, but record if it said to warn. */
1411 args1 = TREE_CHAIN (args1);
1412 args2 = TREE_CHAIN (args2);
1416 /* Compute the size to increment a pointer by. */
1419 c_size_in_bytes (tree type)
1421 enum tree_code code = TREE_CODE (type);
1423 if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK)
1424 return size_one_node;
1426 if (!COMPLETE_OR_VOID_TYPE_P (type))
1428 error ("arithmetic on pointer to an incomplete type");
1429 return size_one_node;
1432 /* Convert in case a char is more than one unit. */
1433 return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
1434 size_int (TYPE_PRECISION (char_type_node)
1438 /* Return either DECL or its known constant value (if it has one). */
1441 decl_constant_value (tree decl)
1443 if (/* Don't change a variable array bound or initial value to a constant
1444 in a place where a variable is invalid. Note that DECL_INITIAL
1445 isn't valid for a PARM_DECL. */
1446 current_function_decl != 0
1447 && TREE_CODE (decl) != PARM_DECL
1448 && !TREE_THIS_VOLATILE (decl)
1449 && TREE_READONLY (decl)
1450 && DECL_INITIAL (decl) != 0
1451 && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK
1452 /* This is invalid if initial value is not constant.
1453 If it has either a function call, a memory reference,
1454 or a variable, then re-evaluating it could give different results. */
1455 && TREE_CONSTANT (DECL_INITIAL (decl))
1456 /* Check for cases where this is sub-optimal, even though valid. */
1457 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR)
1458 return DECL_INITIAL (decl);
1462 /* Return either DECL or its known constant value (if it has one), but
1463 return DECL if pedantic or DECL has mode BLKmode. This is for
1464 bug-compatibility with the old behavior of decl_constant_value
1465 (before GCC 3.0); every use of this function is a bug and it should
1466 be removed before GCC 3.1. It is not appropriate to use pedantic
1467 in a way that affects optimization, and BLKmode is probably not the
1468 right test for avoiding misoptimizations either. */
1471 decl_constant_value_for_broken_optimization (tree decl)
1475 if (pedantic || DECL_MODE (decl) == BLKmode)
1478 ret = decl_constant_value (decl);
1479 /* Avoid unwanted tree sharing between the initializer and current
1480 function's body where the tree can be modified e.g. by the
1482 if (ret != decl && TREE_STATIC (decl))
1483 ret = unshare_expr (ret);
1487 /* Convert the array expression EXP to a pointer. */
1489 array_to_pointer_conversion (tree exp)
1491 tree orig_exp = exp;
1492 tree type = TREE_TYPE (exp);
1494 tree restype = TREE_TYPE (type);
1497 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
1499 STRIP_TYPE_NOPS (exp);
1501 if (TREE_NO_WARNING (orig_exp))
1502 TREE_NO_WARNING (exp) = 1;
1504 ptrtype = build_pointer_type (restype);
1506 if (TREE_CODE (exp) == INDIRECT_REF)
1507 return convert (ptrtype, TREE_OPERAND (exp, 0));
1509 if (TREE_CODE (exp) == VAR_DECL)
1511 /* We are making an ADDR_EXPR of ptrtype. This is a valid
1512 ADDR_EXPR because it's the best way of representing what
1513 happens in C when we take the address of an array and place
1514 it in a pointer to the element type. */
1515 adr = build1 (ADDR_EXPR, ptrtype, exp);
1516 if (!c_mark_addressable (exp))
1517 return error_mark_node;
1518 TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
1522 /* This way is better for a COMPONENT_REF since it can
1523 simplify the offset for a component. */
1524 adr = build_unary_op (ADDR_EXPR, exp, 1);
1525 return convert (ptrtype, adr);
1528 /* Convert the function expression EXP to a pointer. */
1530 function_to_pointer_conversion (tree exp)
1532 tree orig_exp = exp;
1534 gcc_assert (TREE_CODE (TREE_TYPE (exp)) == FUNCTION_TYPE);
1536 STRIP_TYPE_NOPS (exp);
1538 if (TREE_NO_WARNING (orig_exp))
1539 TREE_NO_WARNING (exp) = 1;
1541 return build_unary_op (ADDR_EXPR, exp, 0);
1544 /* Perform the default conversion of arrays and functions to pointers.
1545 Return the result of converting EXP. For any other expression, just
1546 return EXP after removing NOPs. */
1549 default_function_array_conversion (struct c_expr exp)
1551 tree orig_exp = exp.value;
1552 tree type = TREE_TYPE (exp.value);
1553 enum tree_code code = TREE_CODE (type);
1559 bool not_lvalue = false;
1560 bool lvalue_array_p;
1562 while ((TREE_CODE (exp.value) == NON_LVALUE_EXPR
1563 || TREE_CODE (exp.value) == NOP_EXPR
1564 || TREE_CODE (exp.value) == CONVERT_EXPR)
1565 && TREE_TYPE (TREE_OPERAND (exp.value, 0)) == type)
1567 if (TREE_CODE (exp.value) == NON_LVALUE_EXPR)
1569 exp.value = TREE_OPERAND (exp.value, 0);
1572 if (TREE_NO_WARNING (orig_exp))
1573 TREE_NO_WARNING (exp.value) = 1;
1575 lvalue_array_p = !not_lvalue && lvalue_p (exp.value);
1576 if (!flag_isoc99 && !lvalue_array_p)
1578 /* Before C99, non-lvalue arrays do not decay to pointers.
1579 Normally, using such an array would be invalid; but it can
1580 be used correctly inside sizeof or as a statement expression.
1581 Thus, do not give an error here; an error will result later. */
1585 exp.value = array_to_pointer_conversion (exp.value);
1589 exp.value = function_to_pointer_conversion (exp.value);
1592 STRIP_TYPE_NOPS (exp.value);
1593 if (TREE_NO_WARNING (orig_exp))
1594 TREE_NO_WARNING (exp.value) = 1;
1602 /* EXP is an expression of integer type. Apply the integer promotions
1603 to it and return the promoted value. */
1606 perform_integral_promotions (tree exp)
1608 tree type = TREE_TYPE (exp);
1609 enum tree_code code = TREE_CODE (type);
1611 gcc_assert (INTEGRAL_TYPE_P (type));
1613 /* Normally convert enums to int,
1614 but convert wide enums to something wider. */
1615 if (code == ENUMERAL_TYPE)
1617 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
1618 TYPE_PRECISION (integer_type_node)),
1619 ((TYPE_PRECISION (type)
1620 >= TYPE_PRECISION (integer_type_node))
1621 && TYPE_UNSIGNED (type)));
1623 return convert (type, exp);
1626 /* ??? This should no longer be needed now bit-fields have their
1628 if (TREE_CODE (exp) == COMPONENT_REF
1629 && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1))
1630 /* If it's thinner than an int, promote it like a
1631 c_promoting_integer_type_p, otherwise leave it alone. */
1632 && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)),
1633 TYPE_PRECISION (integer_type_node)))
1634 return convert (integer_type_node, exp);
1636 if (c_promoting_integer_type_p (type))
1638 /* Preserve unsignedness if not really getting any wider. */
1639 if (TYPE_UNSIGNED (type)
1640 && TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
1641 return convert (unsigned_type_node, exp);
1643 return convert (integer_type_node, exp);
1650 /* Perform default promotions for C data used in expressions.
1651 Enumeral types or short or char are converted to int.
1652 In addition, manifest constants symbols are replaced by their values. */
1655 default_conversion (tree exp)
1658 tree type = TREE_TYPE (exp);
1659 enum tree_code code = TREE_CODE (type);
1661 /* Functions and arrays have been converted during parsing. */
1662 gcc_assert (code != FUNCTION_TYPE);
1663 if (code == ARRAY_TYPE)
1666 /* Constants can be used directly unless they're not loadable. */
1667 if (TREE_CODE (exp) == CONST_DECL)
1668 exp = DECL_INITIAL (exp);
1670 /* Replace a nonvolatile const static variable with its value unless
1671 it is an array, in which case we must be sure that taking the
1672 address of the array produces consistent results. */
1673 else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE)
1675 exp = decl_constant_value_for_broken_optimization (exp);
1676 type = TREE_TYPE (exp);
1679 /* Strip no-op conversions. */
1681 STRIP_TYPE_NOPS (exp);
1683 if (TREE_NO_WARNING (orig_exp))
1684 TREE_NO_WARNING (exp) = 1;
1686 if (INTEGRAL_TYPE_P (type))
1687 return perform_integral_promotions (exp);
1689 if (code == VOID_TYPE)
1691 error ("void value not ignored as it ought to be");
1692 return error_mark_node;
1697 /* Look up COMPONENT in a structure or union DECL.
1699 If the component name is not found, returns NULL_TREE. Otherwise,
1700 the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL
1701 stepping down the chain to the component, which is in the last
1702 TREE_VALUE of the list. Normally the list is of length one, but if
1703 the component is embedded within (nested) anonymous structures or
1704 unions, the list steps down the chain to the component. */
1707 lookup_field (tree decl, tree component)
1709 tree type = TREE_TYPE (decl);
1712 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1713 to the field elements. Use a binary search on this array to quickly
1714 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1715 will always be set for structures which have many elements. */
1717 if (TYPE_LANG_SPECIFIC (type) && TYPE_LANG_SPECIFIC (type)->s)
1720 tree *field_array = &TYPE_LANG_SPECIFIC (type)->s->elts[0];
1722 field = TYPE_FIELDS (type);
1724 top = TYPE_LANG_SPECIFIC (type)->s->len;
1725 while (top - bot > 1)
1727 half = (top - bot + 1) >> 1;
1728 field = field_array[bot+half];
1730 if (DECL_NAME (field) == NULL_TREE)
1732 /* Step through all anon unions in linear fashion. */
1733 while (DECL_NAME (field_array[bot]) == NULL_TREE)
1735 field = field_array[bot++];
1736 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1737 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1739 tree anon = lookup_field (field, component);
1742 return tree_cons (NULL_TREE, field, anon);
1746 /* Entire record is only anon unions. */
1750 /* Restart the binary search, with new lower bound. */
1754 if (DECL_NAME (field) == component)
1756 if (DECL_NAME (field) < component)
1762 if (DECL_NAME (field_array[bot]) == component)
1763 field = field_array[bot];
1764 else if (DECL_NAME (field) != component)
1769 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1771 if (DECL_NAME (field) == NULL_TREE
1772 && (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1773 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE))
1775 tree anon = lookup_field (field, component);
1778 return tree_cons (NULL_TREE, field, anon);
1781 if (DECL_NAME (field) == component)
1785 if (field == NULL_TREE)
1789 return tree_cons (NULL_TREE, field, NULL_TREE);
1792 /* Make an expression to refer to the COMPONENT field of
1793 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1796 build_component_ref (tree datum, tree component)
1798 tree type = TREE_TYPE (datum);
1799 enum tree_code code = TREE_CODE (type);
1803 if (!objc_is_public (datum, component))
1804 return error_mark_node;
1806 /* See if there is a field or component with name COMPONENT. */
1808 if (code == RECORD_TYPE || code == UNION_TYPE)
1810 if (!COMPLETE_TYPE_P (type))
1812 c_incomplete_type_error (NULL_TREE, type);
1813 return error_mark_node;
1816 field = lookup_field (datum, component);
1820 error ("%qT has no member named %qE", type, component);
1821 return error_mark_node;
1824 /* Chain the COMPONENT_REFs if necessary down to the FIELD.
1825 This might be better solved in future the way the C++ front
1826 end does it - by giving the anonymous entities each a
1827 separate name and type, and then have build_component_ref
1828 recursively call itself. We can't do that here. */
1831 tree subdatum = TREE_VALUE (field);
1835 if (TREE_TYPE (subdatum) == error_mark_node)
1836 return error_mark_node;
1838 quals = TYPE_QUALS (strip_array_types (TREE_TYPE (subdatum)));
1839 quals |= TYPE_QUALS (TREE_TYPE (datum));
1840 subtype = c_build_qualified_type (TREE_TYPE (subdatum), quals);
1842 ref = build3 (COMPONENT_REF, subtype, datum, subdatum,
1844 if (TREE_READONLY (datum) || TREE_READONLY (subdatum))
1845 TREE_READONLY (ref) = 1;
1846 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (subdatum))
1847 TREE_THIS_VOLATILE (ref) = 1;
1849 if (TREE_DEPRECATED (subdatum))
1850 warn_deprecated_use (subdatum);
1854 field = TREE_CHAIN (field);
1860 else if (code != ERROR_MARK)
1861 error ("request for member %qE in something not a structure or union",
1864 return error_mark_node;
1867 /* Given an expression PTR for a pointer, return an expression
1868 for the value pointed to.
1869 ERRORSTRING is the name of the operator to appear in error messages. */
1872 build_indirect_ref (tree ptr, const char *errorstring)
1874 tree pointer = default_conversion (ptr);
1875 tree type = TREE_TYPE (pointer);
1877 if (TREE_CODE (type) == POINTER_TYPE)
1879 if (TREE_CODE (pointer) == CONVERT_EXPR
1880 || TREE_CODE (pointer) == NOP_EXPR
1881 || TREE_CODE (pointer) == VIEW_CONVERT_EXPR)
1883 /* If a warning is issued, mark it to avoid duplicates from
1884 the backend. This only needs to be done at
1885 warn_strict_aliasing > 2. */
1886 if (warn_strict_aliasing > 2)
1887 if (strict_aliasing_warning (TREE_TYPE (TREE_OPERAND (pointer, 0)),
1888 type, TREE_OPERAND (pointer, 0)))
1889 TREE_NO_WARNING (pointer) = 1;
1892 if (TREE_CODE (pointer) == ADDR_EXPR
1893 && (TREE_TYPE (TREE_OPERAND (pointer, 0))
1894 == TREE_TYPE (type)))
1895 return TREE_OPERAND (pointer, 0);
1898 tree t = TREE_TYPE (type);
1901 ref = build1 (INDIRECT_REF, t, pointer);
1903 if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE)
1905 error ("dereferencing pointer to incomplete type");
1906 return error_mark_node;
1908 if (VOID_TYPE_P (t) && skip_evaluation == 0)
1909 warning (0, "dereferencing %<void *%> pointer");
1911 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
1912 so that we get the proper error message if the result is used
1913 to assign to. Also, &* is supposed to be a no-op.
1914 And ANSI C seems to specify that the type of the result
1915 should be the const type. */
1916 /* A de-reference of a pointer to const is not a const. It is valid
1917 to change it via some other pointer. */
1918 TREE_READONLY (ref) = TYPE_READONLY (t);
1919 TREE_SIDE_EFFECTS (ref)
1920 = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer);
1921 TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
1925 else if (TREE_CODE (pointer) != ERROR_MARK)
1926 error ("invalid type argument of %qs", errorstring);
1927 return error_mark_node;
1930 /* This handles expressions of the form "a[i]", which denotes
1933 This is logically equivalent in C to *(a+i), but we may do it differently.
1934 If A is a variable or a member, we generate a primitive ARRAY_REF.
1935 This avoids forcing the array out of registers, and can work on
1936 arrays that are not lvalues (for example, members of structures returned
1940 build_array_ref (tree array, tree index)
1942 bool swapped = false;
1943 if (TREE_TYPE (array) == error_mark_node
1944 || TREE_TYPE (index) == error_mark_node)
1945 return error_mark_node;
1947 if (TREE_CODE (TREE_TYPE (array)) != ARRAY_TYPE
1948 && TREE_CODE (TREE_TYPE (array)) != POINTER_TYPE)
1951 if (TREE_CODE (TREE_TYPE (index)) != ARRAY_TYPE
1952 && TREE_CODE (TREE_TYPE (index)) != POINTER_TYPE)
1954 error ("subscripted value is neither array nor pointer");
1955 return error_mark_node;
1963 if (!INTEGRAL_TYPE_P (TREE_TYPE (index)))
1965 error ("array subscript is not an integer");
1966 return error_mark_node;
1969 if (TREE_CODE (TREE_TYPE (TREE_TYPE (array))) == FUNCTION_TYPE)
1971 error ("subscripted value is pointer to function");
1972 return error_mark_node;
1975 /* ??? Existing practice has been to warn only when the char
1976 index is syntactically the index, not for char[array]. */
1978 warn_array_subscript_with_type_char (index);
1980 /* Apply default promotions *after* noticing character types. */
1981 index = default_conversion (index);
1983 gcc_assert (TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE);
1985 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE)
1989 /* An array that is indexed by a non-constant
1990 cannot be stored in a register; we must be able to do
1991 address arithmetic on its address.
1992 Likewise an array of elements of variable size. */
1993 if (TREE_CODE (index) != INTEGER_CST
1994 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array)))
1995 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST))
1997 if (!c_mark_addressable (array))
1998 return error_mark_node;
2000 /* An array that is indexed by a constant value which is not within
2001 the array bounds cannot be stored in a register either; because we
2002 would get a crash in store_bit_field/extract_bit_field when trying
2003 to access a non-existent part of the register. */
2004 if (TREE_CODE (index) == INTEGER_CST
2005 && TYPE_DOMAIN (TREE_TYPE (array))
2006 && !int_fits_type_p (index, TYPE_DOMAIN (TREE_TYPE (array))))
2008 if (!c_mark_addressable (array))
2009 return error_mark_node;
2015 while (TREE_CODE (foo) == COMPONENT_REF)
2016 foo = TREE_OPERAND (foo, 0);
2017 if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo))
2018 pedwarn ("ISO C forbids subscripting %<register%> array");
2019 else if (!flag_isoc99 && !lvalue_p (foo))
2020 pedwarn ("ISO C90 forbids subscripting non-lvalue array");
2023 type = TREE_TYPE (TREE_TYPE (array));
2024 if (TREE_CODE (type) != ARRAY_TYPE)
2025 type = TYPE_MAIN_VARIANT (type);
2026 rval = build4 (ARRAY_REF, type, array, index, NULL_TREE, NULL_TREE);
2027 /* Array ref is const/volatile if the array elements are
2028 or if the array is. */
2029 TREE_READONLY (rval)
2030 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array)))
2031 | TREE_READONLY (array));
2032 TREE_SIDE_EFFECTS (rval)
2033 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
2034 | TREE_SIDE_EFFECTS (array));
2035 TREE_THIS_VOLATILE (rval)
2036 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
2037 /* This was added by rms on 16 Nov 91.
2038 It fixes vol struct foo *a; a->elts[1]
2039 in an inline function.
2040 Hope it doesn't break something else. */
2041 | TREE_THIS_VOLATILE (array));
2042 return require_complete_type (fold (rval));
2046 tree ar = default_conversion (array);
2048 if (ar == error_mark_node)
2051 gcc_assert (TREE_CODE (TREE_TYPE (ar)) == POINTER_TYPE);
2052 gcc_assert (TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) != FUNCTION_TYPE);
2054 return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, index, 0),
2059 /* Build an external reference to identifier ID. FUN indicates
2060 whether this will be used for a function call. LOC is the source
2061 location of the identifier. */
2063 build_external_ref (tree id, int fun, location_t loc)
2066 tree decl = lookup_name (id);
2068 /* In Objective-C, an instance variable (ivar) may be preferred to
2069 whatever lookup_name() found. */
2070 decl = objc_lookup_ivar (decl, id);
2072 if (decl && decl != error_mark_node)
2075 /* Implicit function declaration. */
2076 ref = implicitly_declare (id);
2077 else if (decl == error_mark_node)
2078 /* Don't complain about something that's already been
2079 complained about. */
2080 return error_mark_node;
2083 undeclared_variable (id, loc);
2084 return error_mark_node;
2087 if (TREE_TYPE (ref) == error_mark_node)
2088 return error_mark_node;
2090 if (TREE_DEPRECATED (ref))
2091 warn_deprecated_use (ref);
2093 if (!skip_evaluation)
2094 assemble_external (ref);
2095 TREE_USED (ref) = 1;
2097 if (TREE_CODE (ref) == FUNCTION_DECL && !in_alignof)
2099 if (!in_sizeof && !in_typeof)
2100 C_DECL_USED (ref) = 1;
2101 else if (DECL_INITIAL (ref) == 0
2102 && DECL_EXTERNAL (ref)
2103 && !TREE_PUBLIC (ref))
2104 record_maybe_used_decl (ref);
2107 if (TREE_CODE (ref) == CONST_DECL)
2109 used_types_insert (TREE_TYPE (ref));
2110 ref = DECL_INITIAL (ref);
2111 TREE_CONSTANT (ref) = 1;
2112 TREE_INVARIANT (ref) = 1;
2114 else if (current_function_decl != 0
2115 && !DECL_FILE_SCOPE_P (current_function_decl)
2116 && (TREE_CODE (ref) == VAR_DECL
2117 || TREE_CODE (ref) == PARM_DECL
2118 || TREE_CODE (ref) == FUNCTION_DECL))
2120 tree context = decl_function_context (ref);
2122 if (context != 0 && context != current_function_decl)
2123 DECL_NONLOCAL (ref) = 1;
2125 /* C99 6.7.4p3: An inline definition of a function with external
2126 linkage ... shall not contain a reference to an identifier with
2127 internal linkage. */
2128 else if (current_function_decl != 0
2129 && DECL_DECLARED_INLINE_P (current_function_decl)
2130 && DECL_EXTERNAL (current_function_decl)
2131 && VAR_OR_FUNCTION_DECL_P (ref)
2132 && DECL_FILE_SCOPE_P (ref)
2134 && (TREE_CODE (ref) != VAR_DECL || TREE_STATIC (ref))
2135 && ! TREE_PUBLIC (ref))
2136 pedwarn ("%H%qD is static but used in inline function %qD "
2137 "which is not static", &loc, ref, current_function_decl);
2142 /* Record details of decls possibly used inside sizeof or typeof. */
2143 struct maybe_used_decl
2147 /* The level seen at (in_sizeof + in_typeof). */
2149 /* The next one at this level or above, or NULL. */
2150 struct maybe_used_decl *next;
2153 static struct maybe_used_decl *maybe_used_decls;
2155 /* Record that DECL, an undefined static function reference seen
2156 inside sizeof or typeof, might be used if the operand of sizeof is
2157 a VLA type or the operand of typeof is a variably modified
2161 record_maybe_used_decl (tree decl)
2163 struct maybe_used_decl *t = XOBNEW (&parser_obstack, struct maybe_used_decl);
2165 t->level = in_sizeof + in_typeof;
2166 t->next = maybe_used_decls;
2167 maybe_used_decls = t;
2170 /* Pop the stack of decls possibly used inside sizeof or typeof. If
2171 USED is false, just discard them. If it is true, mark them used
2172 (if no longer inside sizeof or typeof) or move them to the next
2173 level up (if still inside sizeof or typeof). */
2176 pop_maybe_used (bool used)
2178 struct maybe_used_decl *p = maybe_used_decls;
2179 int cur_level = in_sizeof + in_typeof;
2180 while (p && p->level > cur_level)
2185 C_DECL_USED (p->decl) = 1;
2187 p->level = cur_level;
2191 if (!used || cur_level == 0)
2192 maybe_used_decls = p;
2195 /* Return the result of sizeof applied to EXPR. */
2198 c_expr_sizeof_expr (struct c_expr expr)
2201 if (expr.value == error_mark_node)
2203 ret.value = error_mark_node;
2204 ret.original_code = ERROR_MARK;
2205 pop_maybe_used (false);
2209 ret.value = c_sizeof (TREE_TYPE (expr.value));
2210 ret.original_code = ERROR_MARK;
2211 if (c_vla_type_p (TREE_TYPE (expr.value)))
2213 /* sizeof is evaluated when given a vla (C99 6.5.3.4p2). */
2214 ret.value = build2 (COMPOUND_EXPR, TREE_TYPE (ret.value), expr.value, ret.value);
2216 pop_maybe_used (C_TYPE_VARIABLE_SIZE (TREE_TYPE (expr.value)));
2221 /* Return the result of sizeof applied to T, a structure for the type
2222 name passed to sizeof (rather than the type itself). */
2225 c_expr_sizeof_type (struct c_type_name *t)
2229 type = groktypename (t);
2230 ret.value = c_sizeof (type);
2231 ret.original_code = ERROR_MARK;
2232 pop_maybe_used (type != error_mark_node
2233 ? C_TYPE_VARIABLE_SIZE (type) : false);
2237 /* Build a function call to function FUNCTION with parameters PARAMS.
2238 PARAMS is a list--a chain of TREE_LIST nodes--in which the
2239 TREE_VALUE of each node is a parameter-expression.
2240 FUNCTION's data type may be a function type or a pointer-to-function. */
2243 build_function_call (tree function, tree params)
2245 tree fntype, fundecl = 0;
2246 tree coerced_params;
2247 tree name = NULL_TREE, result;
2250 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
2251 STRIP_TYPE_NOPS (function);
2253 /* Convert anything with function type to a pointer-to-function. */
2254 if (TREE_CODE (function) == FUNCTION_DECL)
2256 /* Implement type-directed function overloading for builtins.
2257 resolve_overloaded_builtin and targetm.resolve_overloaded_builtin
2258 handle all the type checking. The result is a complete expression
2259 that implements this function call. */
2260 tem = resolve_overloaded_builtin (function, params);
2264 name = DECL_NAME (function);
2267 if (TREE_CODE (TREE_TYPE (function)) == FUNCTION_TYPE)
2268 function = function_to_pointer_conversion (function);
2270 /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF
2271 expressions, like those used for ObjC messenger dispatches. */
2272 function = objc_rewrite_function_call (function, params);
2274 fntype = TREE_TYPE (function);
2276 if (TREE_CODE (fntype) == ERROR_MARK)
2277 return error_mark_node;
2279 if (!(TREE_CODE (fntype) == POINTER_TYPE
2280 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE))
2282 error ("called object %qE is not a function", function);
2283 return error_mark_node;
2286 if (fundecl && TREE_THIS_VOLATILE (fundecl))
2287 current_function_returns_abnormally = 1;
2289 /* fntype now gets the type of function pointed to. */
2290 fntype = TREE_TYPE (fntype);
2292 /* Check that the function is called through a compatible prototype.
2293 If it is not, replace the call by a trap, wrapped up in a compound
2294 expression if necessary. This has the nice side-effect to prevent
2295 the tree-inliner from generating invalid assignment trees which may
2296 blow up in the RTL expander later. */
2297 if ((TREE_CODE (function) == NOP_EXPR
2298 || TREE_CODE (function) == CONVERT_EXPR)
2299 && TREE_CODE (tem = TREE_OPERAND (function, 0)) == ADDR_EXPR
2300 && TREE_CODE (tem = TREE_OPERAND (tem, 0)) == FUNCTION_DECL
2301 && !comptypes (fntype, TREE_TYPE (tem)))
2303 tree return_type = TREE_TYPE (fntype);
2304 tree trap = build_function_call (built_in_decls[BUILT_IN_TRAP],
2307 /* This situation leads to run-time undefined behavior. We can't,
2308 therefore, simply error unless we can prove that all possible
2309 executions of the program must execute the code. */
2310 warning (0, "function called through a non-compatible type");
2312 /* We can, however, treat "undefined" any way we please.
2313 Call abort to encourage the user to fix the program. */
2314 inform ("if this code is reached, the program will abort");
2316 if (VOID_TYPE_P (return_type))
2322 if (AGGREGATE_TYPE_P (return_type))
2323 rhs = build_compound_literal (return_type,
2324 build_constructor (return_type, 0));
2326 rhs = fold_convert (return_type, integer_zero_node);
2328 return build2 (COMPOUND_EXPR, return_type, trap, rhs);
2332 /* Convert the parameters to the types declared in the
2333 function prototype, or apply default promotions. */
2336 = convert_arguments (TYPE_ARG_TYPES (fntype), params, function, fundecl);
2338 if (coerced_params == error_mark_node)
2339 return error_mark_node;
2341 /* Check that the arguments to the function are valid. */
2343 check_function_arguments (TYPE_ATTRIBUTES (fntype), coerced_params,
2344 TYPE_ARG_TYPES (fntype));
2346 if (require_constant_value)
2348 result = fold_build3_initializer (CALL_EXPR, TREE_TYPE (fntype),
2349 function, coerced_params, NULL_TREE);
2351 if (TREE_CONSTANT (result)
2352 && (name == NULL_TREE
2353 || strncmp (IDENTIFIER_POINTER (name), "__builtin_", 10) != 0))
2354 pedwarn_init ("initializer element is not constant");
2357 result = fold_build3 (CALL_EXPR, TREE_TYPE (fntype),
2358 function, coerced_params, NULL_TREE);
2360 if (VOID_TYPE_P (TREE_TYPE (result)))
2362 return require_complete_type (result);
2365 /* Convert the argument expressions in the list VALUES
2366 to the types in the list TYPELIST. The result is a list of converted
2367 argument expressions, unless there are too few arguments in which
2368 case it is error_mark_node.
2370 If TYPELIST is exhausted, or when an element has NULL as its type,
2371 perform the default conversions.
2373 PARMLIST is the chain of parm decls for the function being called.
2374 It may be 0, if that info is not available.
2375 It is used only for generating error messages.
2377 FUNCTION is a tree for the called function. It is used only for
2378 error messages, where it is formatted with %qE.
2380 This is also where warnings about wrong number of args are generated.
2382 Both VALUES and the returned value are chains of TREE_LIST nodes
2383 with the elements of the list in the TREE_VALUE slots of those nodes. */
2386 convert_arguments (tree typelist, tree values, tree function, tree fundecl)
2388 tree typetail, valtail;
2393 /* Change pointer to function to the function itself for
2395 if (TREE_CODE (function) == ADDR_EXPR
2396 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
2397 function = TREE_OPERAND (function, 0);
2399 /* Handle an ObjC selector specially for diagnostics. */
2400 selector = objc_message_selector ();
2402 /* Scan the given expressions and types, producing individual
2403 converted arguments and pushing them on RESULT in reverse order. */
2405 for (valtail = values, typetail = typelist, parmnum = 0;
2407 valtail = TREE_CHAIN (valtail), parmnum++)
2409 tree type = typetail ? TREE_VALUE (typetail) : 0;
2410 tree val = TREE_VALUE (valtail);
2411 tree rname = function;
2412 int argnum = parmnum + 1;
2413 const char *invalid_func_diag;
2415 if (type == void_type_node)
2417 error ("too many arguments to function %qE", function);
2421 if (selector && argnum > 2)
2427 STRIP_TYPE_NOPS (val);
2429 val = require_complete_type (val);
2433 /* Formal parm type is specified by a function prototype. */
2436 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
2438 error ("type of formal parameter %d is incomplete", parmnum + 1);
2443 /* Optionally warn about conversions that
2444 differ from the default conversions. */
2445 if (warn_conversion || warn_traditional)
2447 unsigned int formal_prec = TYPE_PRECISION (type);
2449 if (INTEGRAL_TYPE_P (type)
2450 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
2451 warning (0, "passing argument %d of %qE as integer "
2452 "rather than floating due to prototype",
2454 if (INTEGRAL_TYPE_P (type)
2455 && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE)
2456 warning (0, "passing argument %d of %qE as integer "
2457 "rather than complex due to prototype",
2459 else if (TREE_CODE (type) == COMPLEX_TYPE
2460 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
2461 warning (0, "passing argument %d of %qE as complex "
2462 "rather than floating due to prototype",
2464 else if (TREE_CODE (type) == REAL_TYPE
2465 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
2466 warning (0, "passing argument %d of %qE as floating "
2467 "rather than integer due to prototype",
2469 else if (TREE_CODE (type) == COMPLEX_TYPE
2470 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
2471 warning (0, "passing argument %d of %qE as complex "
2472 "rather than integer due to prototype",
2474 else if (TREE_CODE (type) == REAL_TYPE
2475 && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE)
2476 warning (0, "passing argument %d of %qE as floating "
2477 "rather than complex due to prototype",
2479 /* ??? At some point, messages should be written about
2480 conversions between complex types, but that's too messy
2482 else if (TREE_CODE (type) == REAL_TYPE
2483 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
2485 /* Warn if any argument is passed as `float',
2486 since without a prototype it would be `double'. */
2487 if (formal_prec == TYPE_PRECISION (float_type_node)
2488 && type != dfloat32_type_node)
2489 warning (0, "passing argument %d of %qE as %<float%> "
2490 "rather than %<double%> due to prototype",
2493 /* Warn if mismatch between argument and prototype
2494 for decimal float types. Warn of conversions with
2495 binary float types and of precision narrowing due to
2497 else if (type != TREE_TYPE (val)
2498 && (type == dfloat32_type_node
2499 || type == dfloat64_type_node
2500 || type == dfloat128_type_node
2501 || TREE_TYPE (val) == dfloat32_type_node
2502 || TREE_TYPE (val) == dfloat64_type_node
2503 || TREE_TYPE (val) == dfloat128_type_node)
2505 <= TYPE_PRECISION (TREE_TYPE (val))
2506 || (type == dfloat128_type_node
2508 != dfloat64_type_node
2510 != dfloat32_type_node)))
2511 || (type == dfloat64_type_node
2513 != dfloat32_type_node))))
2514 warning (0, "passing argument %d of %qE as %qT "
2515 "rather than %qT due to prototype",
2516 argnum, rname, type, TREE_TYPE (val));
2519 /* Detect integer changing in width or signedness.
2520 These warnings are only activated with
2521 -Wconversion, not with -Wtraditional. */
2522 else if (warn_conversion && INTEGRAL_TYPE_P (type)
2523 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
2525 tree would_have_been = default_conversion (val);
2526 tree type1 = TREE_TYPE (would_have_been);
2528 if (TREE_CODE (type) == ENUMERAL_TYPE
2529 && (TYPE_MAIN_VARIANT (type)
2530 == TYPE_MAIN_VARIANT (TREE_TYPE (val))))
2531 /* No warning if function asks for enum
2532 and the actual arg is that enum type. */
2534 else if (formal_prec != TYPE_PRECISION (type1))
2535 warning (OPT_Wconversion, "passing argument %d of %qE "
2536 "with different width due to prototype",
2538 else if (TYPE_UNSIGNED (type) == TYPE_UNSIGNED (type1))
2540 /* Don't complain if the formal parameter type
2541 is an enum, because we can't tell now whether
2542 the value was an enum--even the same enum. */
2543 else if (TREE_CODE (type) == ENUMERAL_TYPE)
2545 else if (TREE_CODE (val) == INTEGER_CST
2546 && int_fits_type_p (val, type))
2547 /* Change in signedness doesn't matter
2548 if a constant value is unaffected. */
2550 /* If the value is extended from a narrower
2551 unsigned type, it doesn't matter whether we
2552 pass it as signed or unsigned; the value
2553 certainly is the same either way. */
2554 else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
2555 && TYPE_UNSIGNED (TREE_TYPE (val)))
2557 else if (TYPE_UNSIGNED (type))
2558 warning (OPT_Wconversion, "passing argument %d of %qE "
2559 "as unsigned due to prototype",
2562 warning (OPT_Wconversion, "passing argument %d of %qE "
2563 "as signed due to prototype", argnum, rname);
2567 parmval = convert_for_assignment (type, val, ic_argpass,
2571 if (targetm.calls.promote_prototypes (fundecl ? TREE_TYPE (fundecl) : 0)
2572 && INTEGRAL_TYPE_P (type)
2573 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
2574 parmval = default_conversion (parmval);
2576 result = tree_cons (NULL_TREE, parmval, result);
2578 else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE
2579 && (TYPE_PRECISION (TREE_TYPE (val))
2580 < TYPE_PRECISION (double_type_node))
2581 && !DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (val))))
2582 /* Convert `float' to `double'. */
2583 result = tree_cons (NULL_TREE, convert (double_type_node, val), result);
2584 else if ((invalid_func_diag =
2585 targetm.calls.invalid_arg_for_unprototyped_fn (typelist, fundecl, val)))
2587 error (invalid_func_diag);
2588 return error_mark_node;
2591 /* Convert `short' and `char' to full-size `int'. */
2592 result = tree_cons (NULL_TREE, default_conversion (val), result);
2595 typetail = TREE_CHAIN (typetail);
2598 if (typetail != 0 && TREE_VALUE (typetail) != void_type_node)
2600 error ("too few arguments to function %qE", function);
2601 return error_mark_node;
2604 return nreverse (result);
2607 /* This is the entry point used by the parser to build unary operators
2608 in the input. CODE, a tree_code, specifies the unary operator, and
2609 ARG is the operand. For unary plus, the C parser currently uses
2610 CONVERT_EXPR for code. */
2613 parser_build_unary_op (enum tree_code code, struct c_expr arg)
2615 struct c_expr result;
2617 result.original_code = ERROR_MARK;
2618 result.value = build_unary_op (code, arg.value, 0);
2619 overflow_warning (result.value);
2623 /* This is the entry point used by the parser to build binary operators
2624 in the input. CODE, a tree_code, specifies the binary operator, and
2625 ARG1 and ARG2 are the operands. In addition to constructing the
2626 expression, we check for operands that were written with other binary
2627 operators in a way that is likely to confuse the user. */
2630 parser_build_binary_op (enum tree_code code, struct c_expr arg1,
2633 struct c_expr result;
2635 enum tree_code code1 = arg1.original_code;
2636 enum tree_code code2 = arg2.original_code;
2638 result.value = build_binary_op (code, arg1.value, arg2.value, 1);
2639 result.original_code = code;
2641 if (TREE_CODE (result.value) == ERROR_MARK)
2644 /* Check for cases such as x+y<<z which users are likely
2646 if (warn_parentheses)
2647 warn_about_parentheses (code, code1, code2);
2649 /* Warn about comparisons against string literals, with the exception
2650 of testing for equality or inequality of a string literal with NULL. */
2651 if (code == EQ_EXPR || code == NE_EXPR)
2653 if ((code1 == STRING_CST && !integer_zerop (arg2.value))
2654 || (code2 == STRING_CST && !integer_zerop (arg1.value)))
2655 warning (OPT_Waddress,
2656 "comparison with string literal results in unspecified behaviour");
2658 else if (TREE_CODE_CLASS (code) == tcc_comparison
2659 && (code1 == STRING_CST || code2 == STRING_CST))
2660 warning (OPT_Waddress,
2661 "comparison with string literal results in unspecified behaviour");
2663 overflow_warning (result.value);
2668 /* Return a tree for the difference of pointers OP0 and OP1.
2669 The resulting tree has type int. */
2672 pointer_diff (tree op0, tree op1)
2674 tree restype = ptrdiff_type_node;
2676 tree target_type = TREE_TYPE (TREE_TYPE (op0));
2677 tree con0, con1, lit0, lit1;
2678 tree orig_op1 = op1;
2680 if (pedantic || warn_pointer_arith)
2682 if (TREE_CODE (target_type) == VOID_TYPE)
2683 pedwarn ("pointer of type %<void *%> used in subtraction");
2684 if (TREE_CODE (target_type) == FUNCTION_TYPE)
2685 pedwarn ("pointer to a function used in subtraction");
2688 /* If the conversion to ptrdiff_type does anything like widening or
2689 converting a partial to an integral mode, we get a convert_expression
2690 that is in the way to do any simplifications.
2691 (fold-const.c doesn't know that the extra bits won't be needed.
2692 split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a
2693 different mode in place.)
2694 So first try to find a common term here 'by hand'; we want to cover
2695 at least the cases that occur in legal static initializers. */
2696 if ((TREE_CODE (op0) == NOP_EXPR || TREE_CODE (op0) == CONVERT_EXPR)
2697 && (TYPE_PRECISION (TREE_TYPE (op0))
2698 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))))
2699 con0 = TREE_OPERAND (op0, 0);
2702 if ((TREE_CODE (op1) == NOP_EXPR || TREE_CODE (op1) == CONVERT_EXPR)
2703 && (TYPE_PRECISION (TREE_TYPE (op1))
2704 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0)))))
2705 con1 = TREE_OPERAND (op1, 0);
2709 if (TREE_CODE (con0) == PLUS_EXPR)
2711 lit0 = TREE_OPERAND (con0, 1);
2712 con0 = TREE_OPERAND (con0, 0);
2715 lit0 = integer_zero_node;
2717 if (TREE_CODE (con1) == PLUS_EXPR)
2719 lit1 = TREE_OPERAND (con1, 1);
2720 con1 = TREE_OPERAND (con1, 0);
2723 lit1 = integer_zero_node;
2725 if (operand_equal_p (con0, con1, 0))
2732 /* First do the subtraction as integers;
2733 then drop through to build the divide operator.
2734 Do not do default conversions on the minus operator
2735 in case restype is a short type. */
2737 op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
2738 convert (restype, op1), 0);
2739 /* This generates an error if op1 is pointer to incomplete type. */
2740 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1))))
2741 error ("arithmetic on pointer to an incomplete type");
2743 /* This generates an error if op0 is pointer to incomplete type. */
2744 op1 = c_size_in_bytes (target_type);
2746 /* Divide by the size, in easiest possible way. */
2747 return fold_build2 (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
2750 /* Construct and perhaps optimize a tree representation
2751 for a unary operation. CODE, a tree_code, specifies the operation
2752 and XARG is the operand.
2753 For any CODE other than ADDR_EXPR, FLAG nonzero suppresses
2754 the default promotions (such as from short to int).
2755 For ADDR_EXPR, the default promotions are not applied; FLAG nonzero
2756 allows non-lvalues; this is only used to handle conversion of non-lvalue
2757 arrays to pointers in C99. */
2760 build_unary_op (enum tree_code code, tree xarg, int flag)
2762 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
2765 enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
2767 int noconvert = flag;
2768 const char *invalid_op_diag;
2770 if (typecode == ERROR_MARK)
2771 return error_mark_node;
2772 if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE)
2773 typecode = INTEGER_TYPE;
2775 if ((invalid_op_diag
2776 = targetm.invalid_unary_op (code, TREE_TYPE (xarg))))
2778 error (invalid_op_diag);
2779 return error_mark_node;
2785 /* This is used for unary plus, because a CONVERT_EXPR
2786 is enough to prevent anybody from looking inside for
2787 associativity, but won't generate any code. */
2788 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2789 || typecode == COMPLEX_TYPE
2790 || typecode == VECTOR_TYPE))
2792 error ("wrong type argument to unary plus");
2793 return error_mark_node;
2795 else if (!noconvert)
2796 arg = default_conversion (arg);
2797 arg = non_lvalue (arg);
2801 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2802 || typecode == COMPLEX_TYPE
2803 || typecode == VECTOR_TYPE))
2805 error ("wrong type argument to unary minus");
2806 return error_mark_node;
2808 else if (!noconvert)
2809 arg = default_conversion (arg);
2813 if (typecode == INTEGER_TYPE || typecode == VECTOR_TYPE)
2816 arg = default_conversion (arg);
2818 else if (typecode == COMPLEX_TYPE)
2822 pedwarn ("ISO C does not support %<~%> for complex conjugation");
2824 arg = default_conversion (arg);
2828 error ("wrong type argument to bit-complement");
2829 return error_mark_node;
2834 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE))
2836 error ("wrong type argument to abs");
2837 return error_mark_node;
2839 else if (!noconvert)
2840 arg = default_conversion (arg);
2844 /* Conjugating a real value is a no-op, but allow it anyway. */
2845 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2846 || typecode == COMPLEX_TYPE))
2848 error ("wrong type argument to conjugation");
2849 return error_mark_node;
2851 else if (!noconvert)
2852 arg = default_conversion (arg);
2855 case TRUTH_NOT_EXPR:
2856 if (typecode != INTEGER_TYPE
2857 && typecode != REAL_TYPE && typecode != POINTER_TYPE
2858 && typecode != COMPLEX_TYPE)
2860 error ("wrong type argument to unary exclamation mark");
2861 return error_mark_node;
2863 arg = c_objc_common_truthvalue_conversion (arg);
2864 return invert_truthvalue (arg);
2867 if (TREE_CODE (arg) == COMPLEX_CST)
2868 return TREE_REALPART (arg);
2869 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2870 return fold_build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg);
2875 if (TREE_CODE (arg) == COMPLEX_CST)
2876 return TREE_IMAGPART (arg);
2877 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2878 return fold_build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg);
2880 return convert (TREE_TYPE (arg), integer_zero_node);
2882 case PREINCREMENT_EXPR:
2883 case POSTINCREMENT_EXPR:
2884 case PREDECREMENT_EXPR:
2885 case POSTDECREMENT_EXPR:
2887 /* Increment or decrement the real part of the value,
2888 and don't change the imaginary part. */
2889 if (typecode == COMPLEX_TYPE)
2894 pedwarn ("ISO C does not support %<++%> and %<--%>"
2895 " on complex types");
2897 arg = stabilize_reference (arg);
2898 real = build_unary_op (REALPART_EXPR, arg, 1);
2899 imag = build_unary_op (IMAGPART_EXPR, arg, 1);
2900 return build2 (COMPLEX_EXPR, TREE_TYPE (arg),
2901 build_unary_op (code, real, 1), imag);
2904 /* Report invalid types. */
2906 if (typecode != POINTER_TYPE
2907 && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
2909 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
2910 error ("wrong type argument to increment");
2912 error ("wrong type argument to decrement");
2914 return error_mark_node;
2919 tree result_type = TREE_TYPE (arg);
2921 arg = get_unwidened (arg, 0);
2922 argtype = TREE_TYPE (arg);
2924 /* Compute the increment. */
2926 if (typecode == POINTER_TYPE)
2928 /* If pointer target is an undefined struct,
2929 we just cannot know how to do the arithmetic. */
2930 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type)))
2932 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
2933 error ("increment of pointer to unknown structure");
2935 error ("decrement of pointer to unknown structure");
2937 else if ((pedantic || warn_pointer_arith)
2938 && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
2939 || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
2941 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
2942 pedwarn ("wrong type argument to increment");
2944 pedwarn ("wrong type argument to decrement");
2947 inc = c_size_in_bytes (TREE_TYPE (result_type));
2950 inc = integer_one_node;
2952 inc = convert (argtype, inc);
2954 /* Complain about anything else that is not a true lvalue. */
2955 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
2956 || code == POSTINCREMENT_EXPR)
2959 return error_mark_node;
2961 /* Report a read-only lvalue. */
2962 if (TREE_READONLY (arg))
2964 readonly_error (arg,
2965 ((code == PREINCREMENT_EXPR
2966 || code == POSTINCREMENT_EXPR)
2967 ? lv_increment : lv_decrement));
2968 return error_mark_node;
2971 if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
2972 val = boolean_increment (code, arg);
2974 val = build2 (code, TREE_TYPE (arg), arg, inc);
2975 TREE_SIDE_EFFECTS (val) = 1;
2976 val = convert (result_type, val);
2977 if (TREE_CODE (val) != code)
2978 TREE_NO_WARNING (val) = 1;
2983 /* Note that this operation never does default_conversion. */
2985 /* Let &* cancel out to simplify resulting code. */
2986 if (TREE_CODE (arg) == INDIRECT_REF)
2988 /* Don't let this be an lvalue. */
2989 if (lvalue_p (TREE_OPERAND (arg, 0)))
2990 return non_lvalue (TREE_OPERAND (arg, 0));
2991 return TREE_OPERAND (arg, 0);
2994 /* For &x[y], return x+y */
2995 if (TREE_CODE (arg) == ARRAY_REF)
2997 tree op0 = TREE_OPERAND (arg, 0);
2998 if (!c_mark_addressable (op0))
2999 return error_mark_node;
3000 return build_binary_op (PLUS_EXPR,
3001 (TREE_CODE (TREE_TYPE (op0)) == ARRAY_TYPE
3002 ? array_to_pointer_conversion (op0)
3004 TREE_OPERAND (arg, 1), 1);
3007 /* Anything not already handled and not a true memory reference
3008 or a non-lvalue array is an error. */
3009 else if (typecode != FUNCTION_TYPE && !flag
3010 && !lvalue_or_else (arg, lv_addressof))
3011 return error_mark_node;
3013 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
3014 argtype = TREE_TYPE (arg);
3016 /* If the lvalue is const or volatile, merge that into the type
3017 to which the address will point. Note that you can't get a
3018 restricted pointer by taking the address of something, so we
3019 only have to deal with `const' and `volatile' here. */
3020 if ((DECL_P (arg) || REFERENCE_CLASS_P (arg))
3021 && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)))
3022 argtype = c_build_type_variant (argtype,
3023 TREE_READONLY (arg),
3024 TREE_THIS_VOLATILE (arg));
3026 if (!c_mark_addressable (arg))
3027 return error_mark_node;
3029 gcc_assert (TREE_CODE (arg) != COMPONENT_REF
3030 || !DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1)));
3032 argtype = build_pointer_type (argtype);
3034 /* ??? Cope with user tricks that amount to offsetof. Delete this
3035 when we have proper support for integer constant expressions. */
3036 val = get_base_address (arg);
3037 if (val && TREE_CODE (val) == INDIRECT_REF
3038 && TREE_CONSTANT (TREE_OPERAND (val, 0)))
3040 tree op0 = fold_convert (argtype, fold_offsetof (arg, val)), op1;
3042 op1 = fold_convert (argtype, TREE_OPERAND (val, 0));
3043 return fold_build2 (PLUS_EXPR, argtype, op0, op1);
3046 val = build1 (ADDR_EXPR, argtype, arg);
3055 argtype = TREE_TYPE (arg);
3056 return require_constant_value ? fold_build1_initializer (code, argtype, arg)
3057 : fold_build1 (code, argtype, arg);
3060 /* Return nonzero if REF is an lvalue valid for this language.
3061 Lvalues can be assigned, unless their type has TYPE_READONLY.
3062 Lvalues can have their address taken, unless they have C_DECL_REGISTER. */
3067 enum tree_code code = TREE_CODE (ref);
3074 return lvalue_p (TREE_OPERAND (ref, 0));
3076 case COMPOUND_LITERAL_EXPR:
3086 return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
3087 && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
3090 return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
3097 /* Give an error for storing in something that is 'const'. */
3100 readonly_error (tree arg, enum lvalue_use use)
3102 gcc_assert (use == lv_assign || use == lv_increment || use == lv_decrement
3104 /* Using this macro rather than (for example) arrays of messages
3105 ensures that all the format strings are checked at compile
3107 #define READONLY_MSG(A, I, D, AS) (use == lv_assign ? (A) \
3108 : (use == lv_increment ? (I) \
3109 : (use == lv_decrement ? (D) : (AS))))
3110 if (TREE_CODE (arg) == COMPONENT_REF)
3112 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
3113 readonly_error (TREE_OPERAND (arg, 0), use);
3115 error (READONLY_MSG (G_("assignment of read-only member %qD"),
3116 G_("increment of read-only member %qD"),
3117 G_("decrement of read-only member %qD"),
3118 G_("read-only member %qD used as %<asm%> output")),
3119 TREE_OPERAND (arg, 1));
3121 else if (TREE_CODE (arg) == VAR_DECL)
3122 error (READONLY_MSG (G_("assignment of read-only variable %qD"),
3123 G_("increment of read-only variable %qD"),
3124 G_("decrement of read-only variable %qD"),
3125 G_("read-only variable %qD used as %<asm%> output")),
3128 error (READONLY_MSG (G_("assignment of read-only location"),
3129 G_("increment of read-only location"),
3130 G_("decrement of read-only location"),
3131 G_("read-only location used as %<asm%> output")));
3135 /* Return nonzero if REF is an lvalue valid for this language;
3136 otherwise, print an error message and return zero. USE says
3137 how the lvalue is being used and so selects the error message. */
3140 lvalue_or_else (tree ref, enum lvalue_use use)
3142 int win = lvalue_p (ref);
3150 /* Mark EXP saying that we need to be able to take the
3151 address of it; it should not be allocated in a register.
3152 Returns true if successful. */
3155 c_mark_addressable (tree exp)
3160 switch (TREE_CODE (x))
3163 if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
3166 ("cannot take address of bit-field %qD", TREE_OPERAND (x, 1));
3170 /* ... fall through ... */
3176 x = TREE_OPERAND (x, 0);
3179 case COMPOUND_LITERAL_EXPR:
3181 TREE_ADDRESSABLE (x) = 1;
3188 if (C_DECL_REGISTER (x)
3189 && DECL_NONLOCAL (x))
3191 if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
3194 ("global register variable %qD used in nested function", x);
3197 pedwarn ("register variable %qD used in nested function", x);
3199 else if (C_DECL_REGISTER (x))
3201 if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
3202 error ("address of global register variable %qD requested", x);
3204 error ("address of register variable %qD requested", x);
3210 TREE_ADDRESSABLE (x) = 1;
3217 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
3220 build_conditional_expr (tree ifexp, tree op1, tree op2)
3224 enum tree_code code1;
3225 enum tree_code code2;
3226 tree result_type = NULL;
3227 tree orig_op1 = op1, orig_op2 = op2;
3229 /* Promote both alternatives. */
3231 if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
3232 op1 = default_conversion (op1);
3233 if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
3234 op2 = default_conversion (op2);
3236 if (TREE_CODE (ifexp) == ERROR_MARK
3237 || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
3238 || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
3239 return error_mark_node;
3241 type1 = TREE_TYPE (op1);
3242 code1 = TREE_CODE (type1);
3243 type2 = TREE_TYPE (op2);
3244 code2 = TREE_CODE (type2);
3246 /* C90 does not permit non-lvalue arrays in conditional expressions.
3247 In C99 they will be pointers by now. */
3248 if (code1 == ARRAY_TYPE || code2 == ARRAY_TYPE)
3250 error ("non-lvalue array in conditional expression");
3251 return error_mark_node;
3254 /* Quickly detect the usual case where op1 and op2 have the same type
3256 if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
3259 result_type = type1;
3261 result_type = TYPE_MAIN_VARIANT (type1);
3263 else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE
3264 || code1 == COMPLEX_TYPE)
3265 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
3266 || code2 == COMPLEX_TYPE))
3268 result_type = c_common_type (type1, type2);
3270 /* If -Wsign-compare, warn here if type1 and type2 have
3271 different signedness. We'll promote the signed to unsigned
3272 and later code won't know it used to be different.
3273 Do this check on the original types, so that explicit casts
3274 will be considered, but default promotions won't. */
3275 if (warn_sign_compare && !skip_evaluation)
3277 int unsigned_op1 = TYPE_UNSIGNED (TREE_TYPE (orig_op1));
3278 int unsigned_op2 = TYPE_UNSIGNED (TREE_TYPE (orig_op2));
3280 if (unsigned_op1 ^ unsigned_op2)
3284 /* Do not warn if the result type is signed, since the
3285 signed type will only be chosen if it can represent
3286 all the values of the unsigned type. */
3287 if (!TYPE_UNSIGNED (result_type))
3289 /* Do not warn if the signed quantity is an unsuffixed
3290 integer literal (or some static constant expression
3291 involving such literals) and it is non-negative. */
3292 else if ((unsigned_op2
3293 && tree_expr_nonnegative_warnv_p (op1, &ovf))
3295 && tree_expr_nonnegative_warnv_p (op2, &ovf)))
3298 warning (0, "signed and unsigned type in conditional expression");
3302 else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
3304 if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
3305 pedwarn ("ISO C forbids conditional expr with only one void side");
3306 result_type = void_type_node;
3308 else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
3310 if (comp_target_types (type1, type2))
3311 result_type = common_pointer_type (type1, type2);
3312 else if (null_pointer_constant_p (orig_op1))
3313 result_type = qualify_type (type2, type1);
3314 else if (null_pointer_constant_p (orig_op2))
3315 result_type = qualify_type (type1, type2);
3316 else if (VOID_TYPE_P (TREE_TYPE (type1)))
3318 if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
3319 pedwarn ("ISO C forbids conditional expr between "
3320 "%<void *%> and function pointer");
3321 result_type = build_pointer_type (qualify_type (TREE_TYPE (type1),
3322 TREE_TYPE (type2)));
3324 else if (VOID_TYPE_P (TREE_TYPE (type2)))
3326 if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
3327 pedwarn ("ISO C forbids conditional expr between "
3328 "%<void *%> and function pointer");
3329 result_type = build_pointer_type (qualify_type (TREE_TYPE (type2),
3330 TREE_TYPE (type1)));
3334 pedwarn ("pointer type mismatch in conditional expression");
3335 result_type = build_pointer_type (void_type_node);
3338 else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
3340 if (!null_pointer_constant_p (orig_op2))
3341 pedwarn ("pointer/integer type mismatch in conditional expression");
3344 op2 = null_pointer_node;
3346 result_type = type1;
3348 else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
3350 if (!null_pointer_constant_p (orig_op1))
3351 pedwarn ("pointer/integer type mismatch in conditional expression");
3354 op1 = null_pointer_node;
3356 result_type = type2;
3361 if (flag_cond_mismatch)
3362 result_type = void_type_node;
3365 error ("type mismatch in conditional expression");
3366 return error_mark_node;
3370 /* Merge const and volatile flags of the incoming types. */
3372 = build_type_variant (result_type,
3373 TREE_READONLY (op1) || TREE_READONLY (op2),
3374 TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
3376 if (result_type != TREE_TYPE (op1))
3377 op1 = convert_and_check (result_type, op1);
3378 if (result_type != TREE_TYPE (op2))
3379 op2 = convert_and_check (result_type, op2);
3381 return fold_build3 (COND_EXPR, result_type, ifexp, op1, op2);
3384 /* Return a compound expression that performs two expressions and
3385 returns the value of the second of them. */
3388 build_compound_expr (tree expr1, tree expr2)
3390 if (!TREE_SIDE_EFFECTS (expr1))
3392 /* The left-hand operand of a comma expression is like an expression
3393 statement: with -Wextra or -Wunused, we should warn if it doesn't have
3394 any side-effects, unless it was explicitly cast to (void). */
3395 if (warn_unused_value)
3397 if (VOID_TYPE_P (TREE_TYPE (expr1))
3398 && (TREE_CODE (expr1) == NOP_EXPR
3399 || TREE_CODE (expr1) == CONVERT_EXPR))
3401 else if (VOID_TYPE_P (TREE_TYPE (expr1))
3402 && TREE_CODE (expr1) == COMPOUND_EXPR
3403 && (TREE_CODE (TREE_OPERAND (expr1, 1)) == CONVERT_EXPR
3404 || TREE_CODE (TREE_OPERAND (expr1, 1)) == NOP_EXPR))
3405 ; /* (void) a, (void) b, c */
3407 warning (0, "left-hand operand of comma expression has no effect");
3411 /* With -Wunused, we should also warn if the left-hand operand does have
3412 side-effects, but computes a value which is not used. For example, in
3413 `foo() + bar(), baz()' the result of the `+' operator is not used,
3414 so we should issue a warning. */
3415 else if (warn_unused_value)
3416 warn_if_unused_value (expr1, input_location);
3418 if (expr2 == error_mark_node)
3419 return error_mark_node;
3421 return build2 (COMPOUND_EXPR, TREE_TYPE (expr2), expr1, expr2);
3424 /* Build an expression representing a cast to type TYPE of expression EXPR. */
3427 build_c_cast (tree type, tree expr)
3431 if (type == error_mark_node || expr == error_mark_node)
3432 return error_mark_node;
3434 /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing
3435 only in <protocol> qualifications. But when constructing cast expressions,
3436 the protocols do matter and must be kept around. */
3437 if (objc_is_object_ptr (type) && objc_is_object_ptr (TREE_TYPE (expr)))
3438 return build1 (NOP_EXPR, type, expr);
3440 type = TYPE_MAIN_VARIANT (type);
3442 if (TREE_CODE (type) == ARRAY_TYPE)
3444 error ("cast specifies array type");
3445 return error_mark_node;
3448 if (TREE_CODE (type) == FUNCTION_TYPE)
3450 error ("cast specifies function type");
3451 return error_mark_node;
3454 if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value)))
3458 if (TREE_CODE (type) == RECORD_TYPE
3459 || TREE_CODE (type) == UNION_TYPE)
3460 pedwarn ("ISO C forbids casting nonscalar to the same type");
3463 else if (TREE_CODE (type) == UNION_TYPE)
3467 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3468 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
3469 TYPE_MAIN_VARIANT (TREE_TYPE (value))))
3477 pedwarn ("ISO C forbids casts to union type");
3478 t = digest_init (type,
3479 build_constructor_single (type, field, value),
3481 TREE_CONSTANT (t) = TREE_CONSTANT (value);
3482 TREE_INVARIANT (t) = TREE_INVARIANT (value);
3485 error ("cast to union type from type not present in union");
3486 return error_mark_node;
3492 if (type == void_type_node)
3493 return build1 (CONVERT_EXPR, type, value);
3495 otype = TREE_TYPE (value);
3497 /* Optionally warn about potentially worrisome casts. */
3500 && TREE_CODE (type) == POINTER_TYPE
3501 && TREE_CODE (otype) == POINTER_TYPE)
3503 tree in_type = type;
3504 tree in_otype = otype;
3508 /* Check that the qualifiers on IN_TYPE are a superset of
3509 the qualifiers of IN_OTYPE. The outermost level of
3510 POINTER_TYPE nodes is uninteresting and we stop as soon
3511 as we hit a non-POINTER_TYPE node on either type. */
3514 in_otype = TREE_TYPE (in_otype);
3515 in_type = TREE_TYPE (in_type);
3517 /* GNU C allows cv-qualified function types. 'const'
3518 means the function is very pure, 'volatile' means it
3519 can't return. We need to warn when such qualifiers
3520 are added, not when they're taken away. */
3521 if (TREE_CODE (in_otype) == FUNCTION_TYPE
3522 && TREE_CODE (in_type) == FUNCTION_TYPE)
3523 added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
3525 discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
3527 while (TREE_CODE (in_type) == POINTER_TYPE
3528 && TREE_CODE (in_otype) == POINTER_TYPE);
3531 warning (0, "cast adds new qualifiers to function type");
3534 /* There are qualifiers present in IN_OTYPE that are not
3535 present in IN_TYPE. */
3536 warning (0, "cast discards qualifiers from pointer target type");
3539 /* Warn about possible alignment problems. */
3540 if (STRICT_ALIGNMENT
3541 && TREE_CODE (type) == POINTER_TYPE
3542 && TREE_CODE (otype) == POINTER_TYPE
3543 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
3544 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
3545 /* Don't warn about opaque types, where the actual alignment
3546 restriction is unknown. */
3547 && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
3548 || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
3549 && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
3550 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
3551 warning (OPT_Wcast_align,
3552 "cast increases required alignment of target type");
3554 if (TREE_CODE (type) == INTEGER_TYPE
3555 && TREE_CODE (otype) == POINTER_TYPE
3556 && TYPE_PRECISION (type) != TYPE_PRECISION (otype))
3557 /* Unlike conversion of integers to pointers, where the
3558 warning is disabled for converting constants because
3559 of cases such as SIG_*, warn about converting constant
3560 pointers to integers. In some cases it may cause unwanted
3561 sign extension, and a warning is appropriate. */
3562 warning (OPT_Wpointer_to_int_cast,
3563 "cast from pointer to integer of different size");
3565 if (TREE_CODE (value) == CALL_EXPR
3566 && TREE_CODE (type) != TREE_CODE (otype))
3567 warning (OPT_Wbad_function_cast, "cast from function call of type %qT "
3568 "to non-matching type %qT", otype, type);
3570 if (TREE_CODE (type) == POINTER_TYPE
3571 && TREE_CODE (otype) == INTEGER_TYPE
3572 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3573 /* Don't warn about converting any constant. */
3574 && !TREE_CONSTANT (value))
3575 warning (OPT_Wint_to_pointer_cast, "cast to pointer from integer "
3576 "of different size");
3578 if (warn_strict_aliasing <= 2)
3579 strict_aliasing_warning (otype, type, expr);
3581 /* If pedantic, warn for conversions between function and object
3582 pointer types, except for converting a null pointer constant
3583 to function pointer type. */
3585 && TREE_CODE (type) == POINTER_TYPE
3586 && TREE_CODE (otype) == POINTER_TYPE
3587 && TREE_CODE (TREE_TYPE (otype)) == FUNCTION_TYPE
3588 && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)
3589 pedwarn ("ISO C forbids conversion of function pointer to object pointer type");
3592 && TREE_CODE (type) == POINTER_TYPE
3593 && TREE_CODE (otype) == POINTER_TYPE
3594 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
3595 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
3596 && !null_pointer_constant_p (value))
3597 pedwarn ("ISO C forbids conversion of object pointer to function pointer type");
3600 value = convert (type, value);
3602 /* Ignore any integer overflow caused by the cast. */
3603 if (TREE_CODE (value) == INTEGER_CST)
3605 if (CONSTANT_CLASS_P (ovalue)
3606 && (TREE_OVERFLOW (ovalue) || TREE_CONSTANT_OVERFLOW (ovalue)))
3608 /* Avoid clobbering a shared constant. */
3609 value = copy_node (value);
3610 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
3611 TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
3613 else if (TREE_OVERFLOW (value) || TREE_CONSTANT_OVERFLOW (value))
3614 /* Reset VALUE's overflow flags, ensuring constant sharing. */
3615 value = build_int_cst_wide (TREE_TYPE (value),
3616 TREE_INT_CST_LOW (value),
3617 TREE_INT_CST_HIGH (value));
3621 /* Don't let a cast be an lvalue. */
3623 value = non_lvalue (value);
3628 /* Interpret a cast of expression EXPR to type TYPE. */
3630 c_cast_expr (struct c_type_name *type_name, tree expr)
3633 int saved_wsp = warn_strict_prototypes;
3635 /* This avoids warnings about unprototyped casts on
3636 integers. E.g. "#define SIG_DFL (void(*)())0". */
3637 if (TREE_CODE (expr) == INTEGER_CST)
3638 warn_strict_prototypes = 0;
3639 type = groktypename (type_name);
3640 warn_strict_prototypes = saved_wsp;
3642 return build_c_cast (type, expr);
3645 /* Build an assignment expression of lvalue LHS from value RHS.
3646 MODIFYCODE is the code for a binary operator that we use
3647 to combine the old value of LHS with RHS to get the new value.
3648 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
3651 build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs)
3655 tree lhstype = TREE_TYPE (lhs);
3656 tree olhstype = lhstype;
3658 /* Types that aren't fully specified cannot be used in assignments. */
3659 lhs = require_complete_type (lhs);
3661 /* Avoid duplicate error messages from operands that had errors. */
3662 if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
3663 return error_mark_node;
3665 if (!lvalue_or_else (lhs, lv_assign))
3666 return error_mark_node;
3668 STRIP_TYPE_NOPS (rhs);
3672 /* If a binary op has been requested, combine the old LHS value with the RHS
3673 producing the value we should actually store into the LHS. */
3675 if (modifycode != NOP_EXPR)
3677 lhs = stabilize_reference (lhs);
3678 newrhs = build_binary_op (modifycode, lhs, rhs, 1);
3681 /* Give an error for storing in something that is 'const'. */
3683 if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
3684 || ((TREE_CODE (lhstype) == RECORD_TYPE
3685 || TREE_CODE (lhstype) == UNION_TYPE)
3686 && C_TYPE_FIELDS_READONLY (lhstype)))
3688 readonly_error (lhs, lv_assign);
3689 return error_mark_node;
3692 /* If storing into a structure or union member,
3693 it has probably been given type `int'.
3694 Compute the type that would go with
3695 the actual amount of storage the member occupies. */
3697 if (TREE_CODE (lhs) == COMPONENT_REF
3698 && (TREE_CODE (lhstype) == INTEGER_TYPE
3699 || TREE_CODE (lhstype) == BOOLEAN_TYPE
3700 || TREE_CODE (lhstype) == REAL_TYPE
3701 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
3702 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
3704 /* If storing in a field that is in actuality a short or narrower than one,
3705 we must store in the field in its actual type. */
3707 if (lhstype != TREE_TYPE (lhs))
3709 lhs = copy_node (lhs);
3710 TREE_TYPE (lhs) = lhstype;
3713 /* Convert new value to destination type. */
3715 newrhs = convert_for_assignment (lhstype, newrhs, ic_assign,
3716 NULL_TREE, NULL_TREE, 0);
3717 if (TREE_CODE (newrhs) == ERROR_MARK)
3718 return error_mark_node;
3720 /* Emit ObjC write barrier, if necessary. */
3721 if (c_dialect_objc () && flag_objc_gc)
3723 result = objc_generate_write_barrier (lhs, modifycode, newrhs);
3728 /* Scan operands. */
3730 result = build2 (MODIFY_EXPR, lhstype, lhs, newrhs);
3731 TREE_SIDE_EFFECTS (result) = 1;
3733 /* If we got the LHS in a different type for storing in,
3734 convert the result back to the nominal type of LHS
3735 so that the value we return always has the same type
3736 as the LHS argument. */
3738 if (olhstype == TREE_TYPE (result))
3740 return convert_for_assignment (olhstype, result, ic_assign,
3741 NULL_TREE, NULL_TREE, 0);
3744 /* Convert value RHS to type TYPE as preparation for an assignment
3745 to an lvalue of type TYPE.
3746 The real work of conversion is done by `convert'.
3747 The purpose of this function is to generate error messages
3748 for assignments that are not allowed in C.
3749 ERRTYPE says whether it is argument passing, assignment,
3750 initialization or return.
3752 FUNCTION is a tree for the function being called.
3753 PARMNUM is the number of the argument, for printing in error messages. */
3756 convert_for_assignment (tree type, tree rhs, enum impl_conv errtype,
3757 tree fundecl, tree function, int parmnum)
3759 enum tree_code codel = TREE_CODE (type);
3761 enum tree_code coder;
3762 tree rname = NULL_TREE;
3763 bool objc_ok = false;
3765 if (errtype == ic_argpass || errtype == ic_argpass_nonproto)
3768 /* Change pointer to function to the function itself for
3770 if (TREE_CODE (function) == ADDR_EXPR
3771 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
3772 function = TREE_OPERAND (function, 0);
3774 /* Handle an ObjC selector specially for diagnostics. */
3775 selector = objc_message_selector ();
3777 if (selector && parmnum > 2)
3784 /* This macro is used to emit diagnostics to ensure that all format
3785 strings are complete sentences, visible to gettext and checked at
3787 #define WARN_FOR_ASSIGNMENT(AR, AS, IN, RE) \
3792 pedwarn (AR, parmnum, rname); \
3794 case ic_argpass_nonproto: \
3795 warning (0, AR, parmnum, rname); \
3807 gcc_unreachable (); \
3811 STRIP_TYPE_NOPS (rhs);
3813 if (optimize && TREE_CODE (rhs) == VAR_DECL
3814 && TREE_CODE (TREE_TYPE (rhs)) != ARRAY_TYPE)
3815 rhs = decl_constant_value_for_broken_optimization (rhs);
3817 rhstype = TREE_TYPE (rhs);
3818 coder = TREE_CODE (rhstype);
3820 if (coder == ERROR_MARK)
3821 return error_mark_node;
3823 if (c_dialect_objc ())
3846 objc_ok = objc_compare_types (type, rhstype, parmno, rname);
3849 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
3851 overflow_warning (rhs);
3855 if (coder == VOID_TYPE)
3857 /* Except for passing an argument to an unprototyped function,
3858 this is a constraint violation. When passing an argument to
3859 an unprototyped function, it is compile-time undefined;
3860 making it a constraint in that case was rejected in
3862 error ("void value not ignored as it ought to be");
3863 return error_mark_node;
3865 /* A type converts to a reference to it.
3866 This code doesn't fully support references, it's just for the
3867 special case of va_start and va_copy. */
3868 if (codel == REFERENCE_TYPE
3869 && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1)
3871 if (!lvalue_p (rhs))
3873 error ("cannot pass rvalue to reference parameter");
3874 return error_mark_node;
3876 if (!c_mark_addressable (rhs))
3877 return error_mark_node;
3878 rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs);
3880 /* We already know that these two types are compatible, but they
3881 may not be exactly identical. In fact, `TREE_TYPE (type)' is
3882 likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
3883 likely to be va_list, a typedef to __builtin_va_list, which
3884 is different enough that it will cause problems later. */
3885 if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type))
3886 rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs);
3888 rhs = build1 (NOP_EXPR, type, rhs);
3891 /* Some types can interconvert without explicit casts. */
3892 else if (codel == VECTOR_TYPE && coder == VECTOR_TYPE
3893 && vector_types_convertible_p (type, TREE_TYPE (rhs)))
3894 return convert (type, rhs);
3895 /* Arithmetic types all interconvert, and enum is treated like int. */
3896 else if ((codel == INTEGER_TYPE || codel == REAL_TYPE
3897 || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE
3898 || codel == BOOLEAN_TYPE)
3899 && (coder == INTEGER_TYPE || coder == REAL_TYPE
3900 || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE
3901 || coder == BOOLEAN_TYPE))
3902 return convert_and_check (type, rhs);
3904 /* Aggregates in different TUs might need conversion. */
3905 if ((codel == RECORD_TYPE || codel == UNION_TYPE)
3907 && comptypes (type, rhstype))
3908 return convert_and_check (type, rhs);
3910 /* Conversion to a transparent union from its member types.
3911 This applies only to function arguments. */
3912 if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)
3913 && (errtype == ic_argpass || errtype == ic_argpass_nonproto))
3915 tree memb, marginal_memb = NULL_TREE;
3917 for (memb = TYPE_FIELDS (type); memb ; memb = TREE_CHAIN (memb))
3919 tree memb_type = TREE_TYPE (memb);
3921 if (comptypes (TYPE_MAIN_VARIANT (memb_type),
3922 TYPE_MAIN_VARIANT (rhstype)))
3925 if (TREE_CODE (memb_type) != POINTER_TYPE)
3928 if (coder == POINTER_TYPE)
3930 tree ttl = TREE_TYPE (memb_type);
3931 tree ttr = TREE_TYPE (rhstype);
3933 /* Any non-function converts to a [const][volatile] void *
3934 and vice versa; otherwise, targets must be the same.
3935 Meanwhile, the lhs target must have all the qualifiers of
3937 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
3938 || comp_target_types (memb_type, rhstype))
3940 /* If this type won't generate any warnings, use it. */
3941 if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr)
3942 || ((TREE_CODE (ttr) == FUNCTION_TYPE
3943 && TREE_CODE (ttl) == FUNCTION_TYPE)
3944 ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
3945 == TYPE_QUALS (ttr))
3946 : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
3947 == TYPE_QUALS (ttl))))
3950 /* Keep looking for a better type, but remember this one. */
3952 marginal_memb = memb;
3956 /* Can convert integer zero to any pointer type. */
3957 if (null_pointer_constant_p (rhs))
3959 rhs = null_pointer_node;
3964 if (memb || marginal_memb)
3968 /* We have only a marginally acceptable member type;
3969 it needs a warning. */
3970 tree ttl = TREE_TYPE (TREE_TYPE (marginal_memb));
3971 tree ttr = TREE_TYPE (rhstype);
3973 /* Const and volatile mean something different for function
3974 types, so the usual warnings are not appropriate. */
3975 if (TREE_CODE (ttr) == FUNCTION_TYPE
3976 && TREE_CODE (ttl) == FUNCTION_TYPE)
3978 /* Because const and volatile on functions are
3979 restrictions that say the function will not do
3980 certain things, it is okay to use a const or volatile
3981 function where an ordinary one is wanted, but not
3983 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
3984 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE "
3985 "makes qualified function "
3986 "pointer from unqualified"),
3987 G_("assignment makes qualified "
3988 "function pointer from "
3990 G_("initialization makes qualified "
3991 "function pointer from "
3993 G_("return makes qualified function "
3994 "pointer from unqualified"));
3996 else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
3997 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards "
3998 "qualifiers from pointer target type"),
3999 G_("assignment discards qualifiers "
4000 "from pointer target type"),
4001 G_("initialization discards qualifiers "
4002 "from pointer target type"),
4003 G_("return discards qualifiers from "
4004 "pointer target type"));
4006 memb = marginal_memb;
4009 if (pedantic && (!fundecl || !DECL_IN_SYSTEM_HEADER (fundecl)))
4010 pedwarn ("ISO C prohibits argument conversion to union type");
4012 return build_constructor_single (type, memb, rhs);
4016 /* Conversions among pointers */
4017 else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
4018 && (coder == codel))
4020 tree ttl = TREE_TYPE (type);
4021 tree ttr = TREE_TYPE (rhstype);
4024 bool is_opaque_pointer;
4025 int target_cmp = 0; /* Cache comp_target_types () result. */
4027 if (TREE_CODE (mvl) != ARRAY_TYPE)
4028 mvl = TYPE_MAIN_VARIANT (mvl);
4029 if (TREE_CODE (mvr) != ARRAY_TYPE)
4030 mvr = TYPE_MAIN_VARIANT (mvr);
4031 /* Opaque pointers are treated like void pointers. */
4032 is_opaque_pointer = (targetm.vector_opaque_p (type)
4033 || targetm.vector_opaque_p (rhstype))
4034 && TREE_CODE (ttl) == VECTOR_TYPE
4035 && TREE_CODE (ttr) == VECTOR_TYPE;
4037 /* C++ does not allow the implicit conversion void* -> T*. However,
4038 for the purpose of reducing the number of false positives, we
4039 tolerate the special case of
4043 where NULL is typically defined in C to be '(void *) 0'. */
4044 if (VOID_TYPE_P (ttr) && rhs != null_pointer_node && !VOID_TYPE_P (ttl))
4045 warning (OPT_Wc___compat, "request for implicit conversion from "
4046 "%qT to %qT not permitted in C++", rhstype, type);
4048 /* Check if the right-hand side has a format attribute but the
4049 left-hand side doesn't. */
4050 if (warn_missing_format_attribute
4051 && check_missing_format_attribute (type, rhstype))
4056 case ic_argpass_nonproto:
4057 warning (OPT_Wmissing_format_attribute,
4058 "argument %d of %qE might be "
4059 "a candidate for a format attribute",
4063 warning (OPT_Wmissing_format_attribute,
4064 "assignment left-hand side might be "
4065 "a candidate for a format attribute");
4068 warning (OPT_Wmissing_format_attribute,
4069 "initialization left-hand side might be "
4070 "a candidate for a format attribute");
4073 warning (OPT_Wmissing_format_attribute,
4074 "return type might be "
4075 "a candidate for a format attribute");
4082 /* Any non-function converts to a [const][volatile] void *
4083 and vice versa; otherwise, targets must be the same.
4084 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
4085 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4086 || (target_cmp = comp_target_types (type, rhstype))
4087 || is_opaque_pointer
4088 || (c_common_unsigned_type (mvl)
4089 == c_common_unsigned_type (mvr)))
4092 && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE)
4095 && !null_pointer_constant_p (rhs)
4096 && TREE_CODE (ttl) == FUNCTION_TYPE)))
4097 WARN_FOR_ASSIGNMENT (G_("ISO C forbids passing argument %d of "
4098 "%qE between function pointer "
4100 G_("ISO C forbids assignment between "
4101 "function pointer and %<void *%>"),
4102 G_("ISO C forbids initialization between "
4103 "function pointer and %<void *%>"),
4104 G_("ISO C forbids return between function "
4105 "pointer and %<void *%>"));
4106 /* Const and volatile mean something different for function types,
4107 so the usual warnings are not appropriate. */
4108 else if (TREE_CODE (ttr) != FUNCTION_TYPE
4109 && TREE_CODE (ttl) != FUNCTION_TYPE)
4111 if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
4113 /* Types differing only by the presence of the 'volatile'
4114 qualifier are acceptable if the 'volatile' has been added
4115 in by the Objective-C EH machinery. */
4116 if (!objc_type_quals_match (ttl, ttr))
4117 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards "
4118 "qualifiers from pointer target type"),
4119 G_("assignment discards qualifiers "
4120 "from pointer target type"),
4121 G_("initialization discards qualifiers "
4122 "from pointer target type"),
4123 G_("return discards qualifiers from "
4124 "pointer target type"));
4126 /* If this is not a case of ignoring a mismatch in signedness,
4128 else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4131 /* If there is a mismatch, do warn. */
4132 else if (warn_pointer_sign)
4133 WARN_FOR_ASSIGNMENT (G_("pointer targets in passing argument "
4134 "%d of %qE differ in signedness"),
4135 G_("pointer targets in assignment "
4136 "differ in signedness"),
4137 G_("pointer targets in initialization "
4138 "differ in signedness"),
4139 G_("pointer targets in return differ "
4142 else if (TREE_CODE (ttl) == FUNCTION_TYPE
4143 && TREE_CODE (ttr) == FUNCTION_TYPE)
4145 /* Because const and volatile on functions are restrictions
4146 that say the function will not do certain things,
4147 it is okay to use a const or volatile function
4148 where an ordinary one is wanted, but not vice-versa. */
4149 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
4150 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes "
4151 "qualified function pointer "
4152 "from unqualified"),
4153 G_("assignment makes qualified function "
4154 "pointer from unqualified"),
4155 G_("initialization makes qualified "
4156 "function pointer from unqualified"),
4157 G_("return makes qualified function "
4158 "pointer from unqualified"));
4162 /* Avoid warning about the volatile ObjC EH puts on decls. */
4164 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE from "
4165 "incompatible pointer type"),
4166 G_("assignment from incompatible pointer type"),
4167 G_("initialization from incompatible "
4169 G_("return from incompatible pointer type"));
4171 return convert (type, rhs);
4173 else if (codel == POINTER_TYPE && coder == ARRAY_TYPE)
4175 /* ??? This should not be an error when inlining calls to
4176 unprototyped functions. */
4177 error ("invalid use of non-lvalue array");
4178 return error_mark_node;
4180 else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
4182 /* An explicit constant 0 can convert to a pointer,
4183 or one that results from arithmetic, even including
4184 a cast to integer type. */
4185 if (!null_pointer_constant_p (rhs))
4186 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes "
4187 "pointer from integer without a cast"),
4188 G_("assignment makes pointer from integer "
4190 G_("initialization makes pointer from "
4191 "integer without a cast"),
4192 G_("return makes pointer from integer "
4195 return convert (type, rhs);
4197 else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
4199 WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes integer "
4200 "from pointer without a cast"),
4201 G_("assignment makes integer from pointer "
4203 G_("initialization makes integer from pointer "
4205 G_("return makes integer from pointer "
4207 return convert (type, rhs);
4209 else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE)
4210 return convert (type, rhs);
4215 case ic_argpass_nonproto:
4216 /* ??? This should not be an error when inlining calls to
4217 unprototyped functions. */
4218 error ("incompatible type for argument %d of %qE", parmnum, rname);
4221 error ("incompatible types in assignment");
4224 error ("incompatible types in initialization");
4227 error ("incompatible types in return");
4233 return error_mark_node;
4236 /* Convert VALUE for assignment into inlined parameter PARM. ARGNUM
4237 is used for error and warning reporting and indicates which argument
4238 is being processed. */
4241 c_convert_parm_for_inlining (tree parm, tree value, tree fn, int argnum)
4245 /* If FN was prototyped at the call site, the value has been converted
4246 already in convert_arguments.
4247 However, we might see a prototype now that was not in place when
4248 the function call was seen, so check that the VALUE actually matches
4249 PARM before taking an early exit. */
4251 || (TYPE_ARG_TYPES (TREE_TYPE (fn))
4252 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
4253 == TYPE_MAIN_VARIANT (TREE_TYPE (value)))))
4256 type = TREE_TYPE (parm);
4257 ret = convert_for_assignment (type, value,
4258 ic_argpass_nonproto, fn,
4260 if (targetm.calls.promote_prototypes (TREE_TYPE (fn))
4261 && INTEGRAL_TYPE_P (type)
4262 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
4263 ret = default_conversion (ret);
4267 /* If VALUE is a compound expr all of whose expressions are constant, then
4268 return its value. Otherwise, return error_mark_node.
4270 This is for handling COMPOUND_EXPRs as initializer elements
4271 which is allowed with a warning when -pedantic is specified. */
4274 valid_compound_expr_initializer (tree value, tree endtype)
4276 if (TREE_CODE (value) == COMPOUND_EXPR)
4278 if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
4280 return error_mark_node;
4281 return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
4284 else if (!initializer_constant_valid_p (value, endtype))
4285 return error_mark_node;
4290 /* Perform appropriate conversions on the initial value of a variable,
4291 store it in the declaration DECL,
4292 and print any error messages that are appropriate.
4293 If the init is invalid, store an ERROR_MARK. */
4296 store_init_value (tree decl, tree init)
4300 /* If variable's type was invalidly declared, just ignore it. */
4302 type = TREE_TYPE (decl);
4303 if (TREE_CODE (type) == ERROR_MARK)
4306 /* Digest the specified initializer into an expression. */
4308 value = digest_init (type, init, true, TREE_STATIC (decl));
4310 /* Store the expression if valid; else report error. */
4312 if (!in_system_header
4313 && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && !TREE_STATIC (decl))
4314 warning (OPT_Wtraditional, "traditional C rejects automatic "
4315 "aggregate initialization");
4317 DECL_INITIAL (decl) = value;
4319 /* ANSI wants warnings about out-of-range constant initializers. */
4320 STRIP_TYPE_NOPS (value);
4321 constant_expression_warning (value);
4323 /* Check if we need to set array size from compound literal size. */
4324 if (TREE_CODE (type) == ARRAY_TYPE
4325 && TYPE_DOMAIN (type) == 0
4326 && value != error_mark_node)
4328 tree inside_init = init;
4330 STRIP_TYPE_NOPS (inside_init);
4331 inside_init = fold (inside_init);
4333 if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
4335 tree cldecl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
4337 if (TYPE_DOMAIN (TREE_TYPE (cldecl)))
4339 /* For int foo[] = (int [3]){1}; we need to set array size
4340 now since later on array initializer will be just the
4341 brace enclosed list of the compound literal. */
4342 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4343 TREE_TYPE (decl) = type;
4344 TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (cldecl));
4346 layout_decl (cldecl, 0);
4352 /* Methods for storing and printing names for error messages. */
4354 /* Implement a spelling stack that allows components of a name to be pushed
4355 and popped. Each element on the stack is this structure. */
4362 unsigned HOST_WIDE_INT i;
4367 #define SPELLING_STRING 1
4368 #define SPELLING_MEMBER 2
4369 #define SPELLING_BOUNDS 3
4371 static struct spelling *spelling; /* Next stack element (unused). */
4372 static struct spelling *spelling_base; /* Spelling stack base. */
4373 static int spelling_size; /* Size of the spelling stack. */
4375 /* Macros to save and restore the spelling stack around push_... functions.
4376 Alternative to SAVE_SPELLING_STACK. */
4378 #define SPELLING_DEPTH() (spelling - spelling_base)
4379 #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH))
4381 /* Push an element on the spelling stack with type KIND and assign VALUE
4384 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
4386 int depth = SPELLING_DEPTH (); \
4388 if (depth >= spelling_size) \
4390 spelling_size += 10; \
4391 spelling_base = XRESIZEVEC (struct spelling, spelling_base, \
4393 RESTORE_SPELLING_DEPTH (depth); \
4396 spelling->kind = (KIND); \
4397 spelling->MEMBER = (VALUE); \
4401 /* Push STRING on the stack. Printed literally. */
4404 push_string (const char *string)
4406 PUSH_SPELLING (SPELLING_STRING, string, u.s);
4409 /* Push a member name on the stack. Printed as '.' STRING. */
4412 push_member_name (tree decl)
4414 const char *const string
4415 = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
4416 PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
4419 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
4422 push_array_bounds (unsigned HOST_WIDE_INT bounds)
4424 PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
4427 /* Compute the maximum size in bytes of the printed spelling. */
4430 spelling_length (void)
4435 for (p = spelling_base; p < spelling; p++)
4437 if (p->kind == SPELLING_BOUNDS)
4440 size += strlen (p->u.s) + 1;
4446 /* Print the spelling to BUFFER and return it. */
4449 print_spelling (char *buffer)
4454 for (p = spelling_base; p < spelling; p++)
4455 if (p->kind == SPELLING_BOUNDS)
4457 sprintf (d, "[" HOST_WIDE_INT_PRINT_UNSIGNED "]", p->u.i);
4463 if (p->kind == SPELLING_MEMBER)
4465 for (s = p->u.s; (*d = *s++); d++)
4472 /* Issue an error message for a bad initializer component.
4473 MSGID identifies the message.
4474 The component name is taken from the spelling stack. */
4477 error_init (const char *msgid)
4481 error ("%s", _(msgid));
4482 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4484 error ("(near initialization for %qs)", ofwhat);
4487 /* Issue a pedantic warning for a bad initializer component.
4488 MSGID identifies the message.
4489 The component name is taken from the spelling stack. */
4492 pedwarn_init (const char *msgid)
4496 pedwarn ("%s", _(msgid));
4497 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4499 pedwarn ("(near initialization for %qs)", ofwhat);
4502 /* Issue a warning for a bad initializer component.
4503 MSGID identifies the message.
4504 The component name is taken from the spelling stack. */
4507 warning_init (const char *msgid)
4511 warning (0, "%s", _(msgid));
4512 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4514 warning (0, "(near initialization for %qs)", ofwhat);
4517 /* If TYPE is an array type and EXPR is a parenthesized string
4518 constant, warn if pedantic that EXPR is being used to initialize an
4519 object of type TYPE. */
4522 maybe_warn_string_init (tree type, struct c_expr expr)
4525 && TREE_CODE (type) == ARRAY_TYPE
4526 && TREE_CODE (expr.value) == STRING_CST
4527 && expr.original_code != STRING_CST)
4528 pedwarn_init ("array initialized from parenthesized string constant");
4531 /* Digest the parser output INIT as an initializer for type TYPE.
4532 Return a C expression of type TYPE to represent the initial value.
4534 If INIT is a string constant, STRICT_STRING is true if it is
4535 unparenthesized or we should not warn here for it being parenthesized.
4536 For other types of INIT, STRICT_STRING is not used.
4538 REQUIRE_CONSTANT requests an error if non-constant initializers or
4539 elements are seen. */
4542 digest_init (tree type, tree init, bool strict_string, int require_constant)
4544 enum tree_code code = TREE_CODE (type);
4545 tree inside_init = init;
4547 if (type == error_mark_node
4549 || init == error_mark_node
4550 || TREE_TYPE (init) == error_mark_node)
4551 return error_mark_node;
4553 STRIP_TYPE_NOPS (inside_init);
4555 inside_init = fold (inside_init);
4557 /* Initialization of an array of chars from a string constant
4558 optionally enclosed in braces. */
4560 if (code == ARRAY_TYPE && inside_init
4561 && TREE_CODE (inside_init) == STRING_CST)
4563 tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
4564 /* Note that an array could be both an array of character type
4565 and an array of wchar_t if wchar_t is signed char or unsigned
4567 bool char_array = (typ1 == char_type_node
4568 || typ1 == signed_char_type_node
4569 || typ1 == unsigned_char_type_node);
4570 bool wchar_array = !!comptypes (typ1, wchar_type_node);
4571 if (char_array || wchar_array)
4575 expr.value = inside_init;
4576 expr.original_code = (strict_string ? STRING_CST : ERROR_MARK);
4577 maybe_warn_string_init (type, expr);
4580 = (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4583 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4584 TYPE_MAIN_VARIANT (type)))
4587 if (!wchar_array && !char_string)
4589 error_init ("char-array initialized from wide string");
4590 return error_mark_node;
4592 if (char_string && !char_array)
4594 error_init ("wchar_t-array initialized from non-wide string");
4595 return error_mark_node;
4598 TREE_TYPE (inside_init) = type;
4599 if (TYPE_DOMAIN (type) != 0
4600 && TYPE_SIZE (type) != 0
4601 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
4602 /* Subtract 1 (or sizeof (wchar_t))
4603 because it's ok to ignore the terminating null char
4604 that is counted in the length of the constant. */
4605 && 0 > compare_tree_int (TYPE_SIZE_UNIT (type),
4606 TREE_STRING_LENGTH (inside_init)
4607 - ((TYPE_PRECISION (typ1)
4608 != TYPE_PRECISION (char_type_node))
4609 ? (TYPE_PRECISION (wchar_type_node)
4612 pedwarn_init ("initializer-string for array of chars is too long");
4616 else if (INTEGRAL_TYPE_P (typ1))
4618 error_init ("array of inappropriate type initialized "
4619 "from string constant");
4620 return error_mark_node;
4624 /* Build a VECTOR_CST from a *constant* vector constructor. If the
4625 vector constructor is not constant (e.g. {1,2,3,foo()}) then punt
4626 below and handle as a constructor. */
4627 if (code == VECTOR_TYPE
4628 && TREE_CODE (TREE_TYPE (inside_init)) == VECTOR_TYPE
4629 && vector_types_convertible_p (TREE_TYPE (inside_init), type)
4630 && TREE_CONSTANT (inside_init))
4632 if (TREE_CODE (inside_init) == VECTOR_CST
4633 && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4634 TYPE_MAIN_VARIANT (type)))
4637 if (TREE_CODE (inside_init) == CONSTRUCTOR)
4639 unsigned HOST_WIDE_INT ix;
4641 bool constant_p = true;
4643 /* Iterate through elements and check if all constructor
4644 elements are *_CSTs. */
4645 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (inside_init), ix, value)
4646 if (!CONSTANT_CLASS_P (value))
4653 return build_vector_from_ctor (type,
4654 CONSTRUCTOR_ELTS (inside_init));
4658 /* Any type can be initialized
4659 from an expression of the same type, optionally with braces. */
4661 if (inside_init && TREE_TYPE (inside_init) != 0
4662 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4663 TYPE_MAIN_VARIANT (type))
4664 || (code == ARRAY_TYPE
4665 && comptypes (TREE_TYPE (inside_init), type))
4666 || (code == VECTOR_TYPE
4667 && comptypes (TREE_TYPE (inside_init), type))
4668 || (code == POINTER_TYPE
4669 && TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4670 && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
4671 TREE_TYPE (type)))))
4673 if (code == POINTER_TYPE)
4675 if (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE)
4677 if (TREE_CODE (inside_init) == STRING_CST
4678 || TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
4679 inside_init = array_to_pointer_conversion (inside_init);
4682 error_init ("invalid use of non-lvalue array");
4683 return error_mark_node;
4688 if (code == VECTOR_TYPE)
4689 /* Although the types are compatible, we may require a
4691 inside_init = convert (type, inside_init);
4693 if (require_constant
4694 && (code == VECTOR_TYPE || !flag_isoc99)
4695 && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
4697 /* As an extension, allow initializing objects with static storage
4698 duration with compound literals (which are then treated just as
4699 the brace enclosed list they contain). Also allow this for
4700 vectors, as we can only assign them with compound literals. */
4701 tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
4702 inside_init = DECL_INITIAL (decl);
4705 if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
4706 && TREE_CODE (inside_init) != CONSTRUCTOR)
4708 error_init ("array initialized from non-constant array expression");
4709 return error_mark_node;
4712 if (optimize && TREE_CODE (inside_init) == VAR_DECL)
4713 inside_init = decl_constant_value_for_broken_optimization (inside_init);
4715 /* Compound expressions can only occur here if -pedantic or
4716 -pedantic-errors is specified. In the later case, we always want
4717 an error. In the former case, we simply want a warning. */
4718 if (require_constant && pedantic
4719 && TREE_CODE (inside_init) == COMPOUND_EXPR)
4722 = valid_compound_expr_initializer (inside_init,
4723 TREE_TYPE (inside_init));
4724 if (inside_init == error_mark_node)
4725 error_init ("initializer element is not constant");
4727 pedwarn_init ("initializer element is not constant");
4728 if (flag_pedantic_errors)
4729 inside_init = error_mark_node;
4731 else if (require_constant
4732 && !initializer_constant_valid_p (inside_init,
4733 TREE_TYPE (inside_init)))
4735 error_init ("initializer element is not constant");
4736 inside_init = error_mark_node;
4739 /* Added to enable additional -Wmissing-format-attribute warnings. */
4740 if (TREE_CODE (TREE_TYPE (inside_init)) == POINTER_TYPE)
4741 inside_init = convert_for_assignment (type, inside_init, ic_init, NULL_TREE,
4746 /* Handle scalar types, including conversions. */
4748 if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
4749 || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE
4750 || code == VECTOR_TYPE)
4752 if (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE
4753 && (TREE_CODE (init) == STRING_CST
4754 || TREE_CODE (init) == COMPOUND_LITERAL_EXPR))
4755 init = array_to_pointer_conversion (init);
4757 = convert_for_assignment (type, init, ic_init,
4758 NULL_TREE, NULL_TREE, 0);
4760 /* Check to see if we have already given an error message. */
4761 if (inside_init == error_mark_node)
4763 else if (require_constant && !TREE_CONSTANT (inside_init))
4765 error_init ("initializer element is not constant");
4766 inside_init = error_mark_node;
4768 else if (require_constant
4769 && !initializer_constant_valid_p (inside_init,
4770 TREE_TYPE (inside_init)))
4772 error_init ("initializer element is not computable at load time");
4773 inside_init = error_mark_node;
4779 /* Come here only for records and arrays. */
4781 if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4783 error_init ("variable-sized object may not be initialized");
4784 return error_mark_node;
4787 error_init ("invalid initializer");
4788 return error_mark_node;
4791 /* Handle initializers that use braces. */
4793 /* Type of object we are accumulating a constructor for.
4794 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
4795 static tree constructor_type;
4797 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
4799 static tree constructor_fields;
4801 /* For an ARRAY_TYPE, this is the specified index
4802 at which to store the next element we get. */
4803 static tree constructor_index;
4805 /* For an ARRAY_TYPE, this is the maximum index. */
4806 static tree constructor_max_index;
4808 /* For a RECORD_TYPE, this is the first field not yet written out. */
4809 static tree constructor_unfilled_fields;
4811 /* For an ARRAY_TYPE, this is the index of the first element
4812 not yet written out. */
4813 static tree constructor_unfilled_index;
4815 /* In a RECORD_TYPE, the byte index of the next consecutive field.
4816 This is so we can generate gaps between fields, when appropriate. */
4817 static tree constructor_bit_index;
4819 /* If we are saving up the elements rather than allocating them,
4820 this is the list of elements so far (in reverse order,
4821 most recent first). */
4822 static VEC(constructor_elt,gc) *constructor_elements;
4824 /* 1 if constructor should be incrementally stored into a constructor chain,
4825 0 if all the elements should be kept in AVL tree. */
4826 static int constructor_incremental;
4828 /* 1 if so far this constructor's elements are all compile-time constants. */
4829 static int constructor_constant;
4831 /* 1 if so far this constructor's elements are all valid address constants. */
4832 static int constructor_simple;
4834 /* 1 if this constructor is erroneous so far. */
4835 static int constructor_erroneous;
4837 /* Structure for managing pending initializer elements, organized as an
4842 struct init_node *left, *right;
4843 struct init_node *parent;
4849 /* Tree of pending elements at this constructor level.
4850 These are elements encountered out of order
4851 which belong at places we haven't reached yet in actually
4853 Will never hold tree nodes across GC runs. */
4854 static struct init_node *constructor_pending_elts;
4856 /* The SPELLING_DEPTH of this constructor. */
4857 static int constructor_depth;
4859 /* DECL node for which an initializer is being read.
4860 0 means we are reading a constructor expression
4861 such as (struct foo) {...}. */
4862 static tree constructor_decl;
4864 /* Nonzero if this is an initializer for a top-level decl. */
4865 static int constructor_top_level;
4867 /* Nonzero if there were any member designators in this initializer. */
4868 static int constructor_designated;
4870 /* Nesting depth of designator list. */
4871 static int designator_depth;
4873 /* Nonzero if there were diagnosed errors in this designator list. */
4874 static int designator_erroneous;
4877 /* This stack has a level for each implicit or explicit level of
4878 structuring in the initializer, including the outermost one. It
4879 saves the values of most of the variables above. */
4881 struct constructor_range_stack;
4883 struct constructor_stack
4885 struct constructor_stack *next;
4890 tree unfilled_index;
4891 tree unfilled_fields;
4893 VEC(constructor_elt,gc) *elements;
4894 struct init_node *pending_elts;
4897 /* If value nonzero, this value should replace the entire
4898 constructor at this level. */
4899 struct c_expr replacement_value;
4900 struct constructor_range_stack *range_stack;
4910 static struct constructor_stack *constructor_stack;
4912 /* This stack represents designators from some range designator up to
4913 the last designator in the list. */
4915 struct constructor_range_stack
4917 struct constructor_range_stack *next, *prev;
4918 struct constructor_stack *stack;
4925 static struct constructor_range_stack *constructor_range_stack;
4927 /* This stack records separate initializers that are nested.
4928 Nested initializers can't happen in ANSI C, but GNU C allows them
4929 in cases like { ... (struct foo) { ... } ... }. */
4931 struct initializer_stack
4933 struct initializer_stack *next;
4935 struct constructor_stack *constructor_stack;
4936 struct constructor_range_stack *constructor_range_stack;
4937 VEC(constructor_elt,gc) *elements;
4938 struct spelling *spelling;
4939 struct spelling *spelling_base;
4942 char require_constant_value;
4943 char require_constant_elements;
4946 static struct initializer_stack *initializer_stack;
4948 /* Prepare to parse and output the initializer for variable DECL. */
4951 start_init (tree decl, tree asmspec_tree ATTRIBUTE_UNUSED, int top_level)
4954 struct initializer_stack *p = XNEW (struct initializer_stack);
4956 p->decl = constructor_decl;
4957 p->require_constant_value = require_constant_value;
4958 p->require_constant_elements = require_constant_elements;
4959 p->constructor_stack = constructor_stack;
4960 p->constructor_range_stack = constructor_range_stack;
4961 p->elements = constructor_elements;
4962 p->spelling = spelling;
4963 p->spelling_base = spelling_base;
4964 p->spelling_size = spelling_size;
4965 p->top_level = constructor_top_level;
4966 p->next = initializer_stack;
4967 initializer_stack = p;
4969 constructor_decl = decl;
4970 constructor_designated = 0;
4971 constructor_top_level = top_level;
4973 if (decl != 0 && decl != error_mark_node)
4975 require_constant_value = TREE_STATIC (decl);
4976 require_constant_elements
4977 = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99))
4978 /* For a scalar, you can always use any value to initialize,
4979 even within braces. */
4980 && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
4981 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
4982 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
4983 || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
4984 locus = IDENTIFIER_POINTER (DECL_NAME (decl));
4988 require_constant_value = 0;
4989 require_constant_elements = 0;
4990 locus = "(anonymous)";
4993 constructor_stack = 0;
4994 constructor_range_stack = 0;
4996 missing_braces_mentioned = 0;
5000 RESTORE_SPELLING_DEPTH (0);
5003 push_string (locus);
5009 struct initializer_stack *p = initializer_stack;
5011 /* Free the whole constructor stack of this initializer. */
5012 while (constructor_stack)
5014 struct constructor_stack *q = constructor_stack;
5015 constructor_stack = q->next;
5019 gcc_assert (!constructor_range_stack);
5021 /* Pop back to the data of the outer initializer (if any). */
5022 free (spelling_base);
5024 constructor_decl = p->decl;
5025 require_constant_value = p->require_constant_value;
5026 require_constant_elements = p->require_constant_elements;
5027 constructor_stack = p->constructor_stack;
5028 constructor_range_stack = p->constructor_range_stack;
5029 constructor_elements = p->elements;
5030 spelling = p->spelling;
5031 spelling_base = p->spelling_base;
5032 spelling_size = p->spelling_size;
5033 constructor_top_level = p->top_level;
5034 initializer_stack = p->next;
5038 /* Call here when we see the initializer is surrounded by braces.
5039 This is instead of a call to push_init_level;
5040 it is matched by a call to pop_init_level.
5042 TYPE is the type to initialize, for a constructor expression.
5043 For an initializer for a decl, TYPE is zero. */
5046 really_start_incremental_init (tree type)
5048 struct constructor_stack *p = XNEW (struct constructor_stack);
5051 type = TREE_TYPE (constructor_decl);
5053 if (targetm.vector_opaque_p (type))
5054 error ("opaque vector types cannot be initialized");
5056 p->type = constructor_type;
5057 p->fields = constructor_fields;
5058 p->index = constructor_index;
5059 p->max_index = constructor_max_index;
5060 p->unfilled_index = constructor_unfilled_index;
5061 p->unfilled_fields = constructor_unfilled_fields;
5062 p->bit_index = constructor_bit_index;
5063 p->elements = constructor_elements;
5064 p->constant = constructor_constant;
5065 p->simple = constructor_simple;
5066 p->erroneous = constructor_erroneous;
5067 p->pending_elts = constructor_pending_elts;
5068 p->depth = constructor_depth;
5069 p->replacement_value.value = 0;
5070 p->replacement_value.original_code = ERROR_MARK;
5074 p->incremental = constructor_incremental;
5075 p->designated = constructor_designated;
5077 constructor_stack = p;
5079 constructor_constant = 1;
5080 constructor_simple = 1;
5081 constructor_depth = SPELLING_DEPTH ();
5082 constructor_elements = 0;
5083 constructor_pending_elts = 0;
5084 constructor_type = type;
5085 constructor_incremental = 1;
5086 constructor_designated = 0;
5087 designator_depth = 0;
5088 designator_erroneous = 0;
5090 if (TREE_CODE (constructor_type) == RECORD_TYPE
5091 || TREE_CODE (constructor_type) == UNION_TYPE)
5093 constructor_fields = TYPE_FIELDS (constructor_type);
5094 /* Skip any nameless bit fields at the beginning. */
5095 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5096 && DECL_NAME (constructor_fields) == 0)
5097 constructor_fields = TREE_CHAIN (constructor_fields);
5099 constructor_unfilled_fields = constructor_fields;
5100 constructor_bit_index = bitsize_zero_node;
5102 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5104 if (TYPE_DOMAIN (constructor_type))
5106 constructor_max_index
5107 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5109 /* Detect non-empty initializations of zero-length arrays. */
5110 if (constructor_max_index == NULL_TREE
5111 && TYPE_SIZE (constructor_type))
5112 constructor_max_index = build_int_cst (NULL_TREE, -1);
5114 /* constructor_max_index needs to be an INTEGER_CST. Attempts
5115 to initialize VLAs will cause a proper error; avoid tree
5116 checking errors as well by setting a safe value. */
5117 if (constructor_max_index
5118 && TREE_CODE (constructor_max_index) != INTEGER_CST)
5119 constructor_max_index = build_int_cst (NULL_TREE, -1);
5122 = convert (bitsizetype,
5123 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5127 constructor_index = bitsize_zero_node;
5128 constructor_max_index = NULL_TREE;
5131 constructor_unfilled_index = constructor_index;
5133 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
5135 /* Vectors are like simple fixed-size arrays. */
5136 constructor_max_index =
5137 build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1);
5138 constructor_index = bitsize_zero_node;
5139 constructor_unfilled_index = constructor_index;
5143 /* Handle the case of int x = {5}; */
5144 constructor_fields = constructor_type;
5145 constructor_unfilled_fields = constructor_type;
5149 /* Push down into a subobject, for initialization.
5150 If this is for an explicit set of braces, IMPLICIT is 0.
5151 If it is because the next element belongs at a lower level,
5152 IMPLICIT is 1 (or 2 if the push is because of designator list). */
5155 push_init_level (int implicit)
5157 struct constructor_stack *p;
5158 tree value = NULL_TREE;
5160 /* If we've exhausted any levels that didn't have braces,
5161 pop them now. If implicit == 1, this will have been done in
5162 process_init_element; do not repeat it here because in the case
5163 of excess initializers for an empty aggregate this leads to an
5164 infinite cycle of popping a level and immediately recreating
5168 while (constructor_stack->implicit)
5170 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5171 || TREE_CODE (constructor_type) == UNION_TYPE)
5172 && constructor_fields == 0)
5173 process_init_element (pop_init_level (1));
5174 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
5175 && constructor_max_index
5176 && tree_int_cst_lt (constructor_max_index,
5178 process_init_element (pop_init_level (1));
5184 /* Unless this is an explicit brace, we need to preserve previous
5188 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5189 || TREE_CODE (constructor_type) == UNION_TYPE)
5190 && constructor_fields)
5191 value = find_init_member (constructor_fields);
5192 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5193 value = find_init_member (constructor_index);
5196 p = XNEW (struct constructor_stack);
5197 p->type = constructor_type;
5198 p->fields = constructor_fields;
5199 p->index = constructor_index;
5200 p->max_index = constructor_max_index;
5201 p->unfilled_index = constructor_unfilled_index;
5202 p->unfilled_fields = constructor_unfilled_fields;
5203 p->bit_index = constructor_bit_index;
5204 p->elements = constructor_elements;
5205 p->constant = constructor_constant;
5206 p->simple = constructor_simple;
5207 p->erroneous = constructor_erroneous;
5208 p->pending_elts = constructor_pending_elts;
5209 p->depth = constructor_depth;
5210 p->replacement_value.value = 0;
5211 p->replacement_value.original_code = ERROR_MARK;
5212 p->implicit = implicit;
5214 p->incremental = constructor_incremental;
5215 p->designated = constructor_designated;
5216 p->next = constructor_stack;
5218 constructor_stack = p;
5220 constructor_constant = 1;
5221 constructor_simple = 1;
5222 constructor_depth = SPELLING_DEPTH ();
5223 constructor_elements = 0;
5224 constructor_incremental = 1;
5225 constructor_designated = 0;
5226 constructor_pending_elts = 0;
5229 p->range_stack = constructor_range_stack;
5230 constructor_range_stack = 0;
5231 designator_depth = 0;
5232 designator_erroneous = 0;
5235 /* Don't die if an entire brace-pair level is superfluous
5236 in the containing level. */
5237 if (constructor_type == 0)
5239 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5240 || TREE_CODE (constructor_type) == UNION_TYPE)
5242 /* Don't die if there are extra init elts at the end. */
5243 if (constructor_fields == 0)
5244 constructor_type = 0;
5247 constructor_type = TREE_TYPE (constructor_fields);
5248 push_member_name (constructor_fields);
5249 constructor_depth++;
5252 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5254 constructor_type = TREE_TYPE (constructor_type);
5255 push_array_bounds (tree_low_cst (constructor_index, 1));
5256 constructor_depth++;
5259 if (constructor_type == 0)
5261 error_init ("extra brace group at end of initializer");
5262 constructor_fields = 0;
5263 constructor_unfilled_fields = 0;
5267 if (value && TREE_CODE (value) == CONSTRUCTOR)
5269 constructor_constant = TREE_CONSTANT (value);
5270 constructor_simple = TREE_STATIC (value);
5271 constructor_elements = CONSTRUCTOR_ELTS (value);
5272 if (!VEC_empty (constructor_elt, constructor_elements)
5273 && (TREE_CODE (constructor_type) == RECORD_TYPE
5274 || TREE_CODE (constructor_type) == ARRAY_TYPE))
5275 set_nonincremental_init ();
5278 if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned)
5280 missing_braces_mentioned = 1;
5281 warning_init ("missing braces around initializer");
5284 if (TREE_CODE (constructor_type) == RECORD_TYPE
5285 || TREE_CODE (constructor_type) == UNION_TYPE)
5287 constructor_fields = TYPE_FIELDS (constructor_type);
5288 /* Skip any nameless bit fields at the beginning. */
5289 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5290 && DECL_NAME (constructor_fields) == 0)
5291 constructor_fields = TREE_CHAIN (constructor_fields);
5293 constructor_unfilled_fields = constructor_fields;
5294 constructor_bit_index = bitsize_zero_node;
5296 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
5298 /* Vectors are like simple fixed-size arrays. */
5299 constructor_max_index =
5300 build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1);
5301 constructor_index = convert (bitsizetype, integer_zero_node);
5302 constructor_unfilled_index = constructor_index;
5304 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5306 if (TYPE_DOMAIN (constructor_type))
5308 constructor_max_index
5309 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5311 /* Detect non-empty initializations of zero-length arrays. */
5312 if (constructor_max_index == NULL_TREE
5313 && TYPE_SIZE (constructor_type))
5314 constructor_max_index = build_int_cst (NULL_TREE, -1);
5316 /* constructor_max_index needs to be an INTEGER_CST. Attempts
5317 to initialize VLAs will cause a proper error; avoid tree
5318 checking errors as well by setting a safe value. */
5319 if (constructor_max_index
5320 && TREE_CODE (constructor_max_index) != INTEGER_CST)
5321 constructor_max_index = build_int_cst (NULL_TREE, -1);
5324 = convert (bitsizetype,
5325 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5328 constructor_index = bitsize_zero_node;
5330 constructor_unfilled_index = constructor_index;
5331 if (value && TREE_CODE (value) == STRING_CST)
5333 /* We need to split the char/wchar array into individual
5334 characters, so that we don't have to special case it
5336 set_nonincremental_init_from_string (value);
5341 if (constructor_type != error_mark_node)
5342 warning_init ("braces around scalar initializer");
5343 constructor_fields = constructor_type;
5344 constructor_unfilled_fields = constructor_type;
5348 /* At the end of an implicit or explicit brace level,
5349 finish up that level of constructor. If a single expression
5350 with redundant braces initialized that level, return the
5351 c_expr structure for that expression. Otherwise, the original_code
5352 element is set to ERROR_MARK.
5353 If we were outputting the elements as they are read, return 0 as the value
5354 from inner levels (process_init_element ignores that),
5355 but return error_mark_node as the value from the outermost level
5356 (that's what we want to put in DECL_INITIAL).
5357 Otherwise, return a CONSTRUCTOR expression as the value. */
5360 pop_init_level (int implicit)
5362 struct constructor_stack *p;
5365 ret.original_code = ERROR_MARK;
5369 /* When we come to an explicit close brace,
5370 pop any inner levels that didn't have explicit braces. */
5371 while (constructor_stack->implicit)
5372 process_init_element (pop_init_level (1));
5374 gcc_assert (!constructor_range_stack);
5377 /* Now output all pending elements. */
5378 constructor_incremental = 1;
5379 output_pending_init_elements (1);
5381 p = constructor_stack;
5383 /* Error for initializing a flexible array member, or a zero-length
5384 array member in an inappropriate context. */
5385 if (constructor_type && constructor_fields
5386 && TREE_CODE (constructor_type) == ARRAY_TYPE
5387 && TYPE_DOMAIN (constructor_type)
5388 && !TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
5390 /* Silently discard empty initializations. The parser will
5391 already have pedwarned for empty brackets. */
5392 if (integer_zerop (constructor_unfilled_index))
5393 constructor_type = NULL_TREE;
5396 gcc_assert (!TYPE_SIZE (constructor_type));
5398 if (constructor_depth > 2)
5399 error_init ("initialization of flexible array member in a nested context");
5401 pedwarn_init ("initialization of a flexible array member");
5403 /* We have already issued an error message for the existence
5404 of a flexible array member not at the end of the structure.
5405 Discard the initializer so that we do not die later. */
5406 if (TREE_CHAIN (constructor_fields) != NULL_TREE)
5407 constructor_type = NULL_TREE;
5411 /* Warn when some struct elements are implicitly initialized to zero. */
5412 if (warn_missing_field_initializers
5414 && TREE_CODE (constructor_type) == RECORD_TYPE
5415 && constructor_unfilled_fields)
5417 /* Do not warn for flexible array members or zero-length arrays. */
5418 while (constructor_unfilled_fields
5419 && (!DECL_SIZE (constructor_unfilled_fields)
5420 || integer_zerop (DECL_SIZE (constructor_unfilled_fields))))
5421 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
5423 /* Do not warn if this level of the initializer uses member
5424 designators; it is likely to be deliberate. */
5425 if (constructor_unfilled_fields && !constructor_designated)
5427 push_member_name (constructor_unfilled_fields);
5428 warning_init ("missing initializer");
5429 RESTORE_SPELLING_DEPTH (constructor_depth);
5433 /* Pad out the end of the structure. */
5434 if (p->replacement_value.value)
5435 /* If this closes a superfluous brace pair,
5436 just pass out the element between them. */
5437 ret = p->replacement_value;
5438 else if (constructor_type == 0)
5440 else if (TREE_CODE (constructor_type) != RECORD_TYPE
5441 && TREE_CODE (constructor_type) != UNION_TYPE
5442 && TREE_CODE (constructor_type) != ARRAY_TYPE
5443 && TREE_CODE (constructor_type) != VECTOR_TYPE)
5445 /* A nonincremental scalar initializer--just return
5446 the element, after verifying there is just one. */
5447 if (VEC_empty (constructor_elt,constructor_elements))
5449 if (!constructor_erroneous)
5450 error_init ("empty scalar initializer");
5451 ret.value = error_mark_node;
5453 else if (VEC_length (constructor_elt,constructor_elements) != 1)
5455 error_init ("extra elements in scalar initializer");
5456 ret.value = VEC_index (constructor_elt,constructor_elements,0)->value;
5459 ret.value = VEC_index (constructor_elt,constructor_elements,0)->value;
5463 if (constructor_erroneous)
5464 ret.value = error_mark_node;
5467 ret.value = build_constructor (constructor_type,
5468 constructor_elements);
5469 if (constructor_constant)
5470 TREE_CONSTANT (ret.value) = TREE_INVARIANT (ret.value) = 1;
5471 if (constructor_constant && constructor_simple)
5472 TREE_STATIC (ret.value) = 1;
5476 constructor_type = p->type;
5477 constructor_fields = p->fields;
5478 constructor_index = p->index;
5479 constructor_max_index = p->max_index;
5480 constructor_unfilled_index = p->unfilled_index;
5481 constructor_unfilled_fields = p->unfilled_fields;
5482 constructor_bit_index = p->bit_index;
5483 constructor_elements = p->elements;
5484 constructor_constant = p->constant;
5485 constructor_simple = p->simple;
5486 constructor_erroneous = p->erroneous;
5487 constructor_incremental = p->incremental;
5488 constructor_designated = p->designated;
5489 constructor_pending_elts = p->pending_elts;
5490 constructor_depth = p->depth;
5492 constructor_range_stack = p->range_stack;
5493 RESTORE_SPELLING_DEPTH (constructor_depth);
5495 constructor_stack = p->next;
5498 if (ret.value == 0 && constructor_stack == 0)
5499 ret.value = error_mark_node;
5503 /* Common handling for both array range and field name designators.
5504 ARRAY argument is nonzero for array ranges. Returns zero for success. */
5507 set_designator (int array)
5510 enum tree_code subcode;
5512 /* Don't die if an entire brace-pair level is superfluous
5513 in the containing level. */
5514 if (constructor_type == 0)
5517 /* If there were errors in this designator list already, bail out
5519 if (designator_erroneous)
5522 if (!designator_depth)
5524 gcc_assert (!constructor_range_stack);
5526 /* Designator list starts at the level of closest explicit
5528 while (constructor_stack->implicit)
5529 process_init_element (pop_init_level (1));
5530 constructor_designated = 1;
5534 switch (TREE_CODE (constructor_type))
5538 subtype = TREE_TYPE (constructor_fields);
5539 if (subtype != error_mark_node)
5540 subtype = TYPE_MAIN_VARIANT (subtype);
5543 subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
5549 subcode = TREE_CODE (subtype);
5550 if (array && subcode != ARRAY_TYPE)
5552 error_init ("array index in non-array initializer");
5555 else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE)
5557 error_init ("field name not in record or union initializer");
5561 constructor_designated = 1;
5562 push_init_level (2);
5566 /* If there are range designators in designator list, push a new designator
5567 to constructor_range_stack. RANGE_END is end of such stack range or
5568 NULL_TREE if there is no range designator at this level. */
5571 push_range_stack (tree range_end)
5573 struct constructor_range_stack *p;
5575 p = GGC_NEW (struct constructor_range_stack);
5576 p->prev = constructor_range_stack;
5578 p->fields = constructor_fields;
5579 p->range_start = constructor_index;
5580 p->index = constructor_index;
5581 p->stack = constructor_stack;
5582 p->range_end = range_end;
5583 if (constructor_range_stack)
5584 constructor_range_stack->next = p;
5585 constructor_range_stack = p;
5588 /* Within an array initializer, specify the next index to be initialized.
5589 FIRST is that index. If LAST is nonzero, then initialize a range
5590 of indices, running from FIRST through LAST. */
5593 set_init_index (tree first, tree last)
5595 if (set_designator (1))
5598 designator_erroneous = 1;
5600 if (!INTEGRAL_TYPE_P (TREE_TYPE (first))
5601 || (last && !INTEGRAL_TYPE_P (TREE_TYPE (last))))
5603 error_init ("array index in initializer not of integer type");
5607 if (TREE_CODE (first) != INTEGER_CST)
5608 error_init ("nonconstant array index in initializer");
5609 else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
5610 error_init ("nonconstant array index in initializer");
5611 else if (TREE_CODE (constructor_type) != ARRAY_TYPE)
5612 error_init ("array index in non-array initializer");
5613 else if (tree_int_cst_sgn (first) == -1)
5614 error_init ("array index in initializer exceeds array bounds");
5615 else if (constructor_max_index
5616 && tree_int_cst_lt (constructor_max_index, first))
5617 error_init ("array index in initializer exceeds array bounds");
5620 constructor_index = convert (bitsizetype, first);
5624 if (tree_int_cst_equal (first, last))
5626 else if (tree_int_cst_lt (last, first))
5628 error_init ("empty index range in initializer");
5633 last = convert (bitsizetype, last);
5634 if (constructor_max_index != 0
5635 && tree_int_cst_lt (constructor_max_index, last))
5637 error_init ("array index range in initializer exceeds array bounds");
5644 designator_erroneous = 0;
5645 if (constructor_range_stack || last)
5646 push_range_stack (last);
5650 /* Within a struct initializer, specify the next field to be initialized. */
5653 set_init_label (tree fieldname)
5657 if (set_designator (0))
5660 designator_erroneous = 1;
5662 if (TREE_CODE (constructor_type) != RECORD_TYPE
5663 && TREE_CODE (constructor_type) != UNION_TYPE)
5665 error_init ("field name not in record or union initializer");
5669 for (tail = TYPE_FIELDS (constructor_type); tail;
5670 tail = TREE_CHAIN (tail))
5672 if (DECL_NAME (tail) == fieldname)
5677 error ("unknown field %qE specified in initializer", fieldname);
5680 constructor_fields = tail;
5682 designator_erroneous = 0;
5683 if (constructor_range_stack)
5684 push_range_stack (NULL_TREE);
5688 /* Add a new initializer to the tree of pending initializers. PURPOSE
5689 identifies the initializer, either array index or field in a structure.
5690 VALUE is the value of that index or field. */
5693 add_pending_init (tree purpose, tree value)
5695 struct init_node *p, **q, *r;
5697 q = &constructor_pending_elts;
5700 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5705 if (tree_int_cst_lt (purpose, p->purpose))
5707 else if (tree_int_cst_lt (p->purpose, purpose))
5711 if (TREE_SIDE_EFFECTS (p->value))
5712 warning_init ("initialized field with side-effects overwritten");
5713 else if (warn_override_init)
5714 warning_init ("initialized field overwritten");
5724 bitpos = bit_position (purpose);
5728 if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
5730 else if (p->purpose != purpose)
5734 if (TREE_SIDE_EFFECTS (p->value))
5735 warning_init ("initialized field with side-effects overwritten");
5736 else if (warn_override_init)
5737 warning_init ("initialized field overwritten");
5744 r = GGC_NEW (struct init_node);
5745 r->purpose = purpose;
5756 struct init_node *s;
5760 if (p->balance == 0)
5762 else if (p->balance < 0)
5769 p->left->parent = p;
5786 constructor_pending_elts = r;
5791 struct init_node *t = r->right;
5795 r->right->parent = r;
5800 p->left->parent = p;
5803 p->balance = t->balance < 0;
5804 r->balance = -(t->balance > 0);
5819 constructor_pending_elts = t;
5825 /* p->balance == +1; growth of left side balances the node. */
5830 else /* r == p->right */
5832 if (p->balance == 0)
5833 /* Growth propagation from right side. */
5835 else if (p->balance > 0)
5842 p->right->parent = p;
5859 constructor_pending_elts = r;
5861 else /* r->balance == -1 */
5864 struct init_node *t = r->left;
5868 r->left->parent = r;
5873 p->right->parent = p;
5876 r->balance = (t->balance < 0);
5877 p->balance = -(t->balance > 0);
5892 constructor_pending_elts = t;
5898 /* p->balance == -1; growth of right side balances the node. */
5909 /* Build AVL tree from a sorted chain. */
5912 set_nonincremental_init (void)
5914 unsigned HOST_WIDE_INT ix;
5917 if (TREE_CODE (constructor_type) != RECORD_TYPE
5918 && TREE_CODE (constructor_type) != ARRAY_TYPE)
5921 FOR_EACH_CONSTRUCTOR_ELT (constructor_elements, ix, index, value)
5922 add_pending_init (index, value);
5923 constructor_elements = 0;
5924 if (TREE_CODE (constructor_type) == RECORD_TYPE)
5926 constructor_unfilled_fields = TYPE_FIELDS (constructor_type);
5927 /* Skip any nameless bit fields at the beginning. */
5928 while (constructor_unfilled_fields != 0
5929 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
5930 && DECL_NAME (constructor_unfilled_fields) == 0)
5931 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
5934 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5936 if (TYPE_DOMAIN (constructor_type))
5937 constructor_unfilled_index
5938 = convert (bitsizetype,
5939 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5941 constructor_unfilled_index = bitsize_zero_node;
5943 constructor_incremental = 0;
5946 /* Build AVL tree from a string constant. */
5949 set_nonincremental_init_from_string (tree str)
5951 tree value, purpose, type;
5952 HOST_WIDE_INT val[2];
5953 const char *p, *end;
5954 int byte, wchar_bytes, charwidth, bitpos;
5956 gcc_assert (TREE_CODE (constructor_type) == ARRAY_TYPE);
5958 if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
5959 == TYPE_PRECISION (char_type_node))
5963 gcc_assert (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
5964 == TYPE_PRECISION (wchar_type_node));
5965 wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
5967 charwidth = TYPE_PRECISION (char_type_node);
5968 type = TREE_TYPE (constructor_type);
5969 p = TREE_STRING_POINTER (str);
5970 end = p + TREE_STRING_LENGTH (str);
5972 for (purpose = bitsize_zero_node;
5973 p < end && !tree_int_cst_lt (constructor_max_index, purpose);
5974 purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node))
5976 if (wchar_bytes == 1)
5978 val[1] = (unsigned char) *p++;
5985 for (byte = 0; byte < wchar_bytes; byte++)
5987 if (BYTES_BIG_ENDIAN)
5988 bitpos = (wchar_bytes - byte - 1) * charwidth;
5990 bitpos = byte * charwidth;
5991 val[bitpos < HOST_BITS_PER_WIDE_INT]
5992 |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++))
5993 << (bitpos % HOST_BITS_PER_WIDE_INT);
5997 if (!TYPE_UNSIGNED (type))
5999 bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR;
6000 if (bitpos < HOST_BITS_PER_WIDE_INT)
6002 if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1)))
6004 val[1] |= ((HOST_WIDE_INT) -1) << bitpos;
6008 else if (bitpos == HOST_BITS_PER_WIDE_INT)
6013 else if (val[0] & (((HOST_WIDE_INT) 1)
6014 << (bitpos - 1 - HOST_BITS_PER_WIDE_INT)))
6015 val[0] |= ((HOST_WIDE_INT) -1)
6016 << (bitpos - HOST_BITS_PER_WIDE_INT);
6019 value = build_int_cst_wide (type, val[1], val[0]);
6020 add_pending_init (purpose, value);
6023 constructor_incremental = 0;
6026 /* Return value of FIELD in pending initializer or zero if the field was
6027 not initialized yet. */
6030 find_init_member (tree field)
6032 struct init_node *p;
6034 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6036 if (constructor_incremental
6037 && tree_int_cst_lt (field, constructor_unfilled_index))
6038 set_nonincremental_init ();
6040 p = constructor_pending_elts;
6043 if (tree_int_cst_lt (field, p->purpose))
6045 else if (tree_int_cst_lt (p->purpose, field))
6051 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6053 tree bitpos = bit_position (field);
6055 if (constructor_incremental
6056 && (!constructor_unfilled_fields
6057 || tree_int_cst_lt (bitpos,
6058 bit_position (constructor_unfilled_fields))))
6059 set_nonincremental_init ();
6061 p = constructor_pending_elts;
6064 if (field == p->purpose)
6066 else if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
6072 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6074 if (!VEC_empty (constructor_elt, constructor_elements)
6075 && (VEC_last (constructor_elt, constructor_elements)->index
6077 return VEC_last (constructor_elt, constructor_elements)->value;
6082 /* "Output" the next constructor element.
6083 At top level, really output it to assembler code now.
6084 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
6085 TYPE is the data type that the containing data type wants here.
6086 FIELD is the field (a FIELD_DECL) or the index that this element fills.
6087 If VALUE is a string constant, STRICT_STRING is true if it is
6088 unparenthesized or we should not warn here for it being parenthesized.
6089 For other types of VALUE, STRICT_STRING is not used.
6091 PENDING if non-nil means output pending elements that belong
6092 right after this element. (PENDING is normally 1;
6093 it is 0 while outputting pending elements, to avoid recursion.) */
6096 output_init_element (tree value, bool strict_string, tree type, tree field,
6099 constructor_elt *celt;
6101 if (type == error_mark_node || value == error_mark_node)
6103 constructor_erroneous = 1;
6106 if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
6107 && (TREE_CODE (value) == STRING_CST
6108 || TREE_CODE (value) == COMPOUND_LITERAL_EXPR)
6109 && !(TREE_CODE (value) == STRING_CST
6110 && TREE_CODE (type) == ARRAY_TYPE
6111 && INTEGRAL_TYPE_P (TREE_TYPE (type)))
6112 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
6113 TYPE_MAIN_VARIANT (type)))
6114 value = array_to_pointer_conversion (value);
6116 if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR
6117 && require_constant_value && !flag_isoc99 && pending)
6119 /* As an extension, allow initializing objects with static storage
6120 duration with compound literals (which are then treated just as
6121 the brace enclosed list they contain). */
6122 tree decl = COMPOUND_LITERAL_EXPR_DECL (value);
6123 value = DECL_INITIAL (decl);
6126 if (value == error_mark_node)
6127 constructor_erroneous = 1;
6128 else if (!TREE_CONSTANT (value))
6129 constructor_constant = 0;
6130 else if (!initializer_constant_valid_p (value, TREE_TYPE (value))
6131 || ((TREE_CODE (constructor_type) == RECORD_TYPE
6132 || TREE_CODE (constructor_type) == UNION_TYPE)
6133 && DECL_C_BIT_FIELD (field)
6134 && TREE_CODE (value) != INTEGER_CST))
6135 constructor_simple = 0;
6137 if (!initializer_constant_valid_p (value, TREE_TYPE (value)))
6139 if (require_constant_value)
6141 error_init ("initializer element is not constant");
6142 value = error_mark_node;
6144 else if (require_constant_elements)
6145 pedwarn ("initializer element is not computable at load time");
6148 /* If this field is empty (and not at the end of structure),
6149 don't do anything other than checking the initializer. */
6151 && (TREE_TYPE (field) == error_mark_node
6152 || (COMPLETE_TYPE_P (TREE_TYPE (field))
6153 && integer_zerop (TYPE_SIZE (TREE_TYPE (field)))
6154 && (TREE_CODE (constructor_type) == ARRAY_TYPE
6155 || TREE_CHAIN (field)))))
6158 value = digest_init (type, value, strict_string, require_constant_value);
6159 if (value == error_mark_node)
6161 constructor_erroneous = 1;
6165 /* If this element doesn't come next in sequence,
6166 put it on constructor_pending_elts. */
6167 if (TREE_CODE (constructor_type) == ARRAY_TYPE
6168 && (!constructor_incremental
6169 || !tree_int_cst_equal (field, constructor_unfilled_index)))
6171 if (constructor_incremental
6172 && tree_int_cst_lt (field, constructor_unfilled_index))
6173 set_nonincremental_init ();
6175 add_pending_init (field, value);
6178 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6179 && (!constructor_incremental
6180 || field != constructor_unfilled_fields))
6182 /* We do this for records but not for unions. In a union,
6183 no matter which field is specified, it can be initialized
6184 right away since it starts at the beginning of the union. */
6185 if (constructor_incremental)
6187 if (!constructor_unfilled_fields)
6188 set_nonincremental_init ();
6191 tree bitpos, unfillpos;
6193 bitpos = bit_position (field);
6194 unfillpos = bit_position (constructor_unfilled_fields);
6196 if (tree_int_cst_lt (bitpos, unfillpos))
6197 set_nonincremental_init ();
6201 add_pending_init (field, value);
6204 else if (TREE_CODE (constructor_type) == UNION_TYPE
6205 && !VEC_empty (constructor_elt, constructor_elements))
6207 if (TREE_SIDE_EFFECTS (VEC_last (constructor_elt,
6208 constructor_elements)->value))
6209 warning_init ("initialized field with side-effects overwritten");
6210 else if (warn_override_init)
6211 warning_init ("initialized field overwritten");
6213 /* We can have just one union field set. */
6214 constructor_elements = 0;
6217 /* Otherwise, output this element either to
6218 constructor_elements or to the assembler file. */
6220 celt = VEC_safe_push (constructor_elt, gc, constructor_elements, NULL);
6221 celt->index = field;
6222 celt->value = value;
6224 /* Advance the variable that indicates sequential elements output. */
6225 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6226 constructor_unfilled_index
6227 = size_binop (PLUS_EXPR, constructor_unfilled_index,
6229 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6231 constructor_unfilled_fields
6232 = TREE_CHAIN (constructor_unfilled_fields);
6234 /* Skip any nameless bit fields. */
6235 while (constructor_unfilled_fields != 0
6236 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
6237 && DECL_NAME (constructor_unfilled_fields) == 0)
6238 constructor_unfilled_fields =
6239 TREE_CHAIN (constructor_unfilled_fields);
6241 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6242 constructor_unfilled_fields = 0;
6244 /* Now output any pending elements which have become next. */
6246 output_pending_init_elements (0);
6249 /* Output any pending elements which have become next.
6250 As we output elements, constructor_unfilled_{fields,index}
6251 advances, which may cause other elements to become next;
6252 if so, they too are output.
6254 If ALL is 0, we return when there are
6255 no more pending elements to output now.
6257 If ALL is 1, we output space as necessary so that
6258 we can output all the pending elements. */
6261 output_pending_init_elements (int all)
6263 struct init_node *elt = constructor_pending_elts;
6268 /* Look through the whole pending tree.
6269 If we find an element that should be output now,
6270 output it. Otherwise, set NEXT to the element
6271 that comes first among those still pending. */
6276 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6278 if (tree_int_cst_equal (elt->purpose,
6279 constructor_unfilled_index))
6280 output_init_element (elt->value, true,
6281 TREE_TYPE (constructor_type),
6282 constructor_unfilled_index, 0);
6283 else if (tree_int_cst_lt (constructor_unfilled_index,
6286 /* Advance to the next smaller node. */
6291 /* We have reached the smallest node bigger than the
6292 current unfilled index. Fill the space first. */
6293 next = elt->purpose;
6299 /* Advance to the next bigger node. */
6304 /* We have reached the biggest node in a subtree. Find
6305 the parent of it, which is the next bigger node. */
6306 while (elt->parent && elt->parent->right == elt)
6309 if (elt && tree_int_cst_lt (constructor_unfilled_index,
6312 next = elt->purpose;
6318 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6319 || TREE_CODE (constructor_type) == UNION_TYPE)
6321 tree ctor_unfilled_bitpos, elt_bitpos;
6323 /* If the current record is complete we are done. */
6324 if (constructor_unfilled_fields == 0)
6327 ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields);
6328 elt_bitpos = bit_position (elt->purpose);
6329 /* We can't compare fields here because there might be empty
6330 fields in between. */
6331 if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos))
6333 constructor_unfilled_fields = elt->purpose;
6334 output_init_element (elt->value, true, TREE_TYPE (elt->purpose),
6337 else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos))
6339 /* Advance to the next smaller node. */
6344 /* We have reached the smallest node bigger than the
6345 current unfilled field. Fill the space first. */
6346 next = elt->purpose;
6352 /* Advance to the next bigger node. */
6357 /* We have reached the biggest node in a subtree. Find
6358 the parent of it, which is the next bigger node. */
6359 while (elt->parent && elt->parent->right == elt)
6363 && (tree_int_cst_lt (ctor_unfilled_bitpos,
6364 bit_position (elt->purpose))))
6366 next = elt->purpose;
6374 /* Ordinarily return, but not if we want to output all
6375 and there are elements left. */
6376 if (!(all && next != 0))
6379 /* If it's not incremental, just skip over the gap, so that after
6380 jumping to retry we will output the next successive element. */
6381 if (TREE_CODE (constructor_type) == RECORD_TYPE
6382 || TREE_CODE (constructor_type) == UNION_TYPE)
6383 constructor_unfilled_fields = next;
6384 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6385 constructor_unfilled_index = next;
6387 /* ELT now points to the node in the pending tree with the next
6388 initializer to output. */
6392 /* Add one non-braced element to the current constructor level.
6393 This adjusts the current position within the constructor's type.
6394 This may also start or terminate implicit levels
6395 to handle a partly-braced initializer.
6397 Once this has found the correct level for the new element,
6398 it calls output_init_element. */
6401 process_init_element (struct c_expr value)
6403 tree orig_value = value.value;
6404 int string_flag = orig_value != 0 && TREE_CODE (orig_value) == STRING_CST;
6405 bool strict_string = value.original_code == STRING_CST;
6407 designator_depth = 0;
6408 designator_erroneous = 0;
6410 /* Handle superfluous braces around string cst as in
6411 char x[] = {"foo"}; */
6414 && TREE_CODE (constructor_type) == ARRAY_TYPE
6415 && INTEGRAL_TYPE_P (TREE_TYPE (constructor_type))
6416 && integer_zerop (constructor_unfilled_index))
6418 if (constructor_stack->replacement_value.value)
6419 error_init ("excess elements in char array initializer");
6420 constructor_stack->replacement_value = value;
6424 if (constructor_stack->replacement_value.value != 0)
6426 error_init ("excess elements in struct initializer");
6430 /* Ignore elements of a brace group if it is entirely superfluous
6431 and has already been diagnosed. */
6432 if (constructor_type == 0)
6435 /* If we've exhausted any levels that didn't have braces,
6437 while (constructor_stack->implicit)
6439 if ((TREE_CODE (constructor_type) == RECORD_TYPE
6440 || TREE_CODE (constructor_type) == UNION_TYPE)
6441 && constructor_fields == 0)
6442 process_init_element (pop_init_level (1));
6443 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
6444 && (constructor_max_index == 0
6445 || tree_int_cst_lt (constructor_max_index,
6446 constructor_index)))
6447 process_init_element (pop_init_level (1));
6452 /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
6453 if (constructor_range_stack)
6455 /* If value is a compound literal and we'll be just using its
6456 content, don't put it into a SAVE_EXPR. */
6457 if (TREE_CODE (value.value) != COMPOUND_LITERAL_EXPR
6458 || !require_constant_value
6460 value.value = save_expr (value.value);
6465 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6468 enum tree_code fieldcode;
6470 if (constructor_fields == 0)
6472 pedwarn_init ("excess elements in struct initializer");
6476 fieldtype = TREE_TYPE (constructor_fields);
6477 if (fieldtype != error_mark_node)
6478 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6479 fieldcode = TREE_CODE (fieldtype);
6481 /* Error for non-static initialization of a flexible array member. */
6482 if (fieldcode == ARRAY_TYPE
6483 && !require_constant_value
6484 && TYPE_SIZE (fieldtype) == NULL_TREE
6485 && TREE_CHAIN (constructor_fields) == NULL_TREE)
6487 error_init ("non-static initialization of a flexible array member");
6491 /* Accept a string constant to initialize a subarray. */
6492 if (value.value != 0
6493 && fieldcode == ARRAY_TYPE
6494 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype))
6496 value.value = orig_value;
6497 /* Otherwise, if we have come to a subaggregate,
6498 and we don't have an element of its type, push into it. */
6499 else if (value.value != 0
6500 && value.value != error_mark_node
6501 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype
6502 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6503 || fieldcode == UNION_TYPE))
6505 push_init_level (1);
6511 push_member_name (constructor_fields);
6512 output_init_element (value.value, strict_string,
6513 fieldtype, constructor_fields, 1);
6514 RESTORE_SPELLING_DEPTH (constructor_depth);
6517 /* Do the bookkeeping for an element that was
6518 directly output as a constructor. */
6520 /* For a record, keep track of end position of last field. */
6521 if (DECL_SIZE (constructor_fields))
6522 constructor_bit_index
6523 = size_binop (PLUS_EXPR,
6524 bit_position (constructor_fields),
6525 DECL_SIZE (constructor_fields));
6527 /* If the current field was the first one not yet written out,
6528 it isn't now, so update. */
6529 if (constructor_unfilled_fields == constructor_fields)
6531 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6532 /* Skip any nameless bit fields. */
6533 while (constructor_unfilled_fields != 0
6534 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
6535 && DECL_NAME (constructor_unfilled_fields) == 0)
6536 constructor_unfilled_fields =
6537 TREE_CHAIN (constructor_unfilled_fields);
6541 constructor_fields = TREE_CHAIN (constructor_fields);
6542 /* Skip any nameless bit fields at the beginning. */
6543 while (constructor_fields != 0
6544 && DECL_C_BIT_FIELD (constructor_fields)
6545 && DECL_NAME (constructor_fields) == 0)
6546 constructor_fields = TREE_CHAIN (constructor_fields);
6548 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6551 enum tree_code fieldcode;
6553 if (constructor_fields == 0)
6555 pedwarn_init ("excess elements in union initializer");
6559 fieldtype = TREE_TYPE (constructor_fields);
6560 if (fieldtype != error_mark_node)
6561 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6562 fieldcode = TREE_CODE (fieldtype);
6564 /* Warn that traditional C rejects initialization of unions.
6565 We skip the warning if the value is zero. This is done
6566 under the assumption that the zero initializer in user
6567 code appears conditioned on e.g. __STDC__ to avoid
6568 "missing initializer" warnings and relies on default
6569 initialization to zero in the traditional C case.
6570 We also skip the warning if the initializer is designated,
6571 again on the assumption that this must be conditional on
6572 __STDC__ anyway (and we've already complained about the
6573 member-designator already). */
6574 if (!in_system_header && !constructor_designated
6575 && !(value.value && (integer_zerop (value.value)
6576 || real_zerop (value.value))))
6577 warning (OPT_Wtraditional, "traditional C rejects initialization "
6580 /* Accept a string constant to initialize a subarray. */
6581 if (value.value != 0
6582 && fieldcode == ARRAY_TYPE
6583 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype))
6585 value.value = orig_value;
6586 /* Otherwise, if we have come to a subaggregate,
6587 and we don't have an element of its type, push into it. */
6588 else if (value.value != 0
6589 && value.value != error_mark_node
6590 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype
6591 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6592 || fieldcode == UNION_TYPE))
6594 push_init_level (1);
6600 push_member_name (constructor_fields);
6601 output_init_element (value.value, strict_string,
6602 fieldtype, constructor_fields, 1);
6603 RESTORE_SPELLING_DEPTH (constructor_depth);
6606 /* Do the bookkeeping for an element that was
6607 directly output as a constructor. */
6609 constructor_bit_index = DECL_SIZE (constructor_fields);
6610 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6613 constructor_fields = 0;
6615 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6617 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6618 enum tree_code eltcode = TREE_CODE (elttype);
6620 /* Accept a string constant to initialize a subarray. */
6621 if (value.value != 0
6622 && eltcode == ARRAY_TYPE
6623 && INTEGRAL_TYPE_P (TREE_TYPE (elttype))
6625 value.value = orig_value;
6626 /* Otherwise, if we have come to a subaggregate,
6627 and we don't have an element of its type, push into it. */
6628 else if (value.value != 0
6629 && value.value != error_mark_node
6630 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != elttype
6631 && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
6632 || eltcode == UNION_TYPE))
6634 push_init_level (1);
6638 if (constructor_max_index != 0
6639 && (tree_int_cst_lt (constructor_max_index, constructor_index)
6640 || integer_all_onesp (constructor_max_index)))
6642 pedwarn_init ("excess elements in array initializer");
6646 /* Now output the actual element. */
6649 push_array_bounds (tree_low_cst (constructor_index, 1));
6650 output_init_element (value.value, strict_string,
6651 elttype, constructor_index, 1);
6652 RESTORE_SPELLING_DEPTH (constructor_depth);
6656 = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
6659 /* If we are doing the bookkeeping for an element that was
6660 directly output as a constructor, we must update
6661 constructor_unfilled_index. */
6662 constructor_unfilled_index = constructor_index;
6664 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
6666 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6668 /* Do a basic check of initializer size. Note that vectors
6669 always have a fixed size derived from their type. */
6670 if (tree_int_cst_lt (constructor_max_index, constructor_index))
6672 pedwarn_init ("excess elements in vector initializer");
6676 /* Now output the actual element. */
6678 output_init_element (value.value, strict_string,
6679 elttype, constructor_index, 1);
6682 = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
6685 /* If we are doing the bookkeeping for an element that was
6686 directly output as a constructor, we must update
6687 constructor_unfilled_index. */
6688 constructor_unfilled_index = constructor_index;
6691 /* Handle the sole element allowed in a braced initializer
6692 for a scalar variable. */
6693 else if (constructor_type != error_mark_node
6694 && constructor_fields == 0)
6696 pedwarn_init ("excess elements in scalar initializer");
6702 output_init_element (value.value, strict_string,
6703 constructor_type, NULL_TREE, 1);
6704 constructor_fields = 0;
6707 /* Handle range initializers either at this level or anywhere higher
6708 in the designator stack. */
6709 if (constructor_range_stack)
6711 struct constructor_range_stack *p, *range_stack;
6714 range_stack = constructor_range_stack;
6715 constructor_range_stack = 0;
6716 while (constructor_stack != range_stack->stack)
6718 gcc_assert (constructor_stack->implicit);
6719 process_init_element (pop_init_level (1));
6721 for (p = range_stack;
6722 !p->range_end || tree_int_cst_equal (p->index, p->range_end);
6725 gcc_assert (constructor_stack->implicit);
6726 process_init_element (pop_init_level (1));
6729 p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node);
6730 if (tree_int_cst_equal (p->index, p->range_end) && !p->prev)
6735 constructor_index = p->index;
6736 constructor_fields = p->fields;
6737 if (finish && p->range_end && p->index == p->range_start)
6745 push_init_level (2);
6746 p->stack = constructor_stack;
6747 if (p->range_end && tree_int_cst_equal (p->index, p->range_end))
6748 p->index = p->range_start;
6752 constructor_range_stack = range_stack;
6759 constructor_range_stack = 0;
6762 /* Build a complete asm-statement, whose components are a CV_QUALIFIER
6763 (guaranteed to be 'volatile' or null) and ARGS (represented using
6764 an ASM_EXPR node). */
6766 build_asm_stmt (tree cv_qualifier, tree args)
6768 if (!ASM_VOLATILE_P (args) && cv_qualifier)
6769 ASM_VOLATILE_P (args) = 1;
6770 return add_stmt (args);
6773 /* Build an asm-expr, whose components are a STRING, some OUTPUTS,
6774 some INPUTS, and some CLOBBERS. The latter three may be NULL.
6775 SIMPLE indicates whether there was anything at all after the
6776 string in the asm expression -- asm("blah") and asm("blah" : )
6777 are subtly different. We use a ASM_EXPR node to represent this. */
6779 build_asm_expr (tree string, tree outputs, tree inputs, tree clobbers,
6785 const char *constraint;
6786 const char **oconstraints;
6787 bool allows_mem, allows_reg, is_inout;
6788 int ninputs, noutputs;
6790 ninputs = list_length (inputs);
6791 noutputs = list_length (outputs);
6792 oconstraints = (const char **) alloca (noutputs * sizeof (const char *));
6794 string = resolve_asm_operand_names (string, outputs, inputs);
6796 /* Remove output conversions that change the type but not the mode. */
6797 for (i = 0, tail = outputs; tail; ++i, tail = TREE_CHAIN (tail))
6799 tree output = TREE_VALUE (tail);
6801 /* ??? Really, this should not be here. Users should be using a
6802 proper lvalue, dammit. But there's a long history of using casts
6803 in the output operands. In cases like longlong.h, this becomes a
6804 primitive form of typechecking -- if the cast can be removed, then
6805 the output operand had a type of the proper width; otherwise we'll
6806 get an error. Gross, but ... */
6807 STRIP_NOPS (output);
6809 if (!lvalue_or_else (output, lv_asm))
6810 output = error_mark_node;
6812 if (output != error_mark_node
6813 && (TREE_READONLY (output)
6814 || TYPE_READONLY (TREE_TYPE (output))
6815 || ((TREE_CODE (TREE_TYPE (output)) == RECORD_TYPE
6816 || TREE_CODE (TREE_TYPE (output)) == UNION_TYPE)
6817 && C_TYPE_FIELDS_READONLY (TREE_TYPE (output)))))
6818 readonly_error (output, lv_asm);
6820 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
6821 oconstraints[i] = constraint;
6823 if (parse_output_constraint (&constraint, i, ninputs, noutputs,
6824 &allows_mem, &allows_reg, &is_inout))
6826 /* If the operand is going to end up in memory,
6827 mark it addressable. */
6828 if (!allows_reg && !c_mark_addressable (output))
6829 output = error_mark_node;
6832 output = error_mark_node;
6834 TREE_VALUE (tail) = output;
6837 for (i = 0, tail = inputs; tail; ++i, tail = TREE_CHAIN (tail))
6841 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
6842 input = TREE_VALUE (tail);
6844 if (parse_input_constraint (&constraint, i, ninputs, noutputs, 0,
6845 oconstraints, &allows_mem, &allows_reg))
6847 /* If the operand is going to end up in memory,
6848 mark it addressable. */
6849 if (!allows_reg && allows_mem)
6851 /* Strip the nops as we allow this case. FIXME, this really
6852 should be rejected or made deprecated. */
6854 if (!c_mark_addressable (input))
6855 input = error_mark_node;
6859 input = error_mark_node;
6861 TREE_VALUE (tail) = input;
6864 args = build_stmt (ASM_EXPR, string, outputs, inputs, clobbers);
6866 /* asm statements without outputs, including simple ones, are treated
6868 ASM_INPUT_P (args) = simple;
6869 ASM_VOLATILE_P (args) = (noutputs == 0);
6874 /* Generate a goto statement to LABEL. */
6877 c_finish_goto_label (tree label)
6879 tree decl = lookup_label (label);
6883 if (C_DECL_UNJUMPABLE_STMT_EXPR (decl))
6885 error ("jump into statement expression");
6889 if (C_DECL_UNJUMPABLE_VM (decl))
6891 error ("jump into scope of identifier with variably modified type");
6895 if (!C_DECL_UNDEFINABLE_STMT_EXPR (decl))
6897 /* No jump from outside this statement expression context, so
6898 record that there is a jump from within this context. */
6899 struct c_label_list *nlist;
6900 nlist = XOBNEW (&parser_obstack, struct c_label_list);
6901 nlist->next = label_context_stack_se->labels_used;
6902 nlist->label = decl;
6903 label_context_stack_se->labels_used = nlist;
6906 if (!C_DECL_UNDEFINABLE_VM (decl))
6908 /* No jump from outside this context context of identifiers with
6909 variably modified type, so record that there is a jump from
6910 within this context. */
6911 struct c_label_list *nlist;
6912 nlist = XOBNEW (&parser_obstack, struct c_label_list);
6913 nlist->next = label_context_stack_vm->labels_used;
6914 nlist->label = decl;
6915 label_context_stack_vm->labels_used = nlist;
6918 TREE_USED (decl) = 1;
6919 return add_stmt (build1 (GOTO_EXPR, void_type_node, decl));
6922 /* Generate a computed goto statement to EXPR. */
6925 c_finish_goto_ptr (tree expr)
6928 pedwarn ("ISO C forbids %<goto *expr;%>");
6929 expr = convert (ptr_type_node, expr);
6930 return add_stmt (build1 (GOTO_EXPR, void_type_node, expr));
6933 /* Generate a C `return' statement. RETVAL is the expression for what
6934 to return, or a null pointer for `return;' with no value. */
6937 c_finish_return (tree retval)
6939 tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)), ret_stmt;
6940 bool no_warning = false;
6942 if (TREE_THIS_VOLATILE (current_function_decl))
6943 warning (0, "function declared %<noreturn%> has a %<return%> statement");
6947 current_function_returns_null = 1;
6948 if ((warn_return_type || flag_isoc99)
6949 && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
6951 pedwarn_c99 ("%<return%> with no value, in "
6952 "function returning non-void");
6956 else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
6958 current_function_returns_null = 1;
6959 if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
6960 pedwarn ("%<return%> with a value, in function returning void");
6964 tree t = convert_for_assignment (valtype, retval, ic_return,
6965 NULL_TREE, NULL_TREE, 0);
6966 tree res = DECL_RESULT (current_function_decl);
6969 current_function_returns_value = 1;
6970 if (t == error_mark_node)
6973 inner = t = convert (TREE_TYPE (res), t);
6975 /* Strip any conversions, additions, and subtractions, and see if
6976 we are returning the address of a local variable. Warn if so. */
6979 switch (TREE_CODE (inner))
6981 case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR:
6983 inner = TREE_OPERAND (inner, 0);
6987 /* If the second operand of the MINUS_EXPR has a pointer
6988 type (or is converted from it), this may be valid, so
6989 don't give a warning. */
6991 tree op1 = TREE_OPERAND (inner, 1);
6993 while (!POINTER_TYPE_P (TREE_TYPE (op1))
6994 && (TREE_CODE (op1) == NOP_EXPR
6995 || TREE_CODE (op1) == NON_LVALUE_EXPR
6996 || TREE_CODE (op1) == CONVERT_EXPR))
6997 op1 = TREE_OPERAND (op1, 0);
6999 if (POINTER_TYPE_P (TREE_TYPE (op1)))
7002 inner = TREE_OPERAND (inner, 0);
7007 inner = TREE_OPERAND (inner, 0);
7009 while (REFERENCE_CLASS_P (inner)
7010 && TREE_CODE (inner) != INDIRECT_REF)
7011 inner = TREE_OPERAND (inner, 0);
7014 && !DECL_EXTERNAL (inner)
7015 && !TREE_STATIC (inner)
7016 && DECL_CONTEXT (inner) == current_function_decl)
7017 warning (0, "function returns address of local variable");
7027 retval = build2 (MODIFY_EXPR, TREE_TYPE (res), res, t);
7030 ret_stmt = build_stmt (RETURN_EXPR, retval);
7031 TREE_NO_WARNING (ret_stmt) |= no_warning;
7032 return add_stmt (ret_stmt);
7036 /* The SWITCH_EXPR being built. */
7039 /* The original type of the testing expression, i.e. before the
7040 default conversion is applied. */
7043 /* A splay-tree mapping the low element of a case range to the high
7044 element, or NULL_TREE if there is no high element. Used to
7045 determine whether or not a new case label duplicates an old case
7046 label. We need a tree, rather than simply a hash table, because
7047 of the GNU case range extension. */
7050 /* Number of nested statement expressions within this switch
7051 statement; if nonzero, case and default labels may not
7053 unsigned int blocked_stmt_expr;
7055 /* Scope of outermost declarations of identifiers with variably
7056 modified type within this switch statement; if nonzero, case and
7057 default labels may not appear. */
7058 unsigned int blocked_vm;
7060 /* The next node on the stack. */
7061 struct c_switch *next;
7064 /* A stack of the currently active switch statements. The innermost
7065 switch statement is on the top of the stack. There is no need to
7066 mark the stack for garbage collection because it is only active
7067 during the processing of the body of a function, and we never
7068 collect at that point. */
7070 struct c_switch *c_switch_stack;
7072 /* Start a C switch statement, testing expression EXP. Return the new
7076 c_start_case (tree exp)
7078 tree orig_type = error_mark_node;
7079 struct c_switch *cs;
7081 if (exp != error_mark_node)
7083 orig_type = TREE_TYPE (exp);
7085 if (!INTEGRAL_TYPE_P (orig_type))
7087 if (orig_type != error_mark_node)
7089 error ("switch quantity not an integer");
7090 orig_type = error_mark_node;
7092 exp = integer_zero_node;
7096 tree type = TYPE_MAIN_VARIANT (orig_type);
7098 if (!in_system_header
7099 && (type == long_integer_type_node
7100 || type == long_unsigned_type_node))
7101 warning (OPT_Wtraditional, "%<long%> switch expression not "
7102 "converted to %<int%> in ISO C");
7104 exp = default_conversion (exp);
7108 /* Add this new SWITCH_EXPR to the stack. */
7109 cs = XNEW (struct c_switch);
7110 cs->switch_expr = build3 (SWITCH_EXPR, orig_type, exp, NULL_TREE, NULL_TREE);
7111 cs->orig_type = orig_type;
7112 cs->cases = splay_tree_new (case_compare, NULL, NULL);
7113 cs->blocked_stmt_expr = 0;
7115 cs->next = c_switch_stack;
7116 c_switch_stack = cs;
7118 return add_stmt (cs->switch_expr);
7121 /* Process a case label. */
7124 do_case (tree low_value, tree high_value)
7126 tree label = NULL_TREE;
7128 if (c_switch_stack && !c_switch_stack->blocked_stmt_expr
7129 && !c_switch_stack->blocked_vm)
7131 label = c_add_case_label (c_switch_stack->cases,
7132 SWITCH_COND (c_switch_stack->switch_expr),
7133 c_switch_stack->orig_type,
7134 low_value, high_value);
7135 if (label == error_mark_node)
7138 else if (c_switch_stack && c_switch_stack->blocked_stmt_expr)
7141 error ("case label in statement expression not containing "
7142 "enclosing switch statement");
7144 error ("%<default%> label in statement expression not containing "
7145 "enclosing switch statement");
7147 else if (c_switch_stack && c_switch_stack->blocked_vm)
7150 error ("case label in scope of identifier with variably modified "
7151 "type not containing enclosing switch statement");
7153 error ("%<default%> label in scope of identifier with variably "
7154 "modified type not containing enclosing switch statement");
7157 error ("case label not within a switch statement");
7159 error ("%<default%> label not within a switch statement");
7164 /* Finish the switch statement. */
7167 c_finish_case (tree body)
7169 struct c_switch *cs = c_switch_stack;
7170 location_t switch_location;
7172 SWITCH_BODY (cs->switch_expr) = body;
7174 /* We must not be within a statement expression nested in the switch
7175 at this point; we might, however, be within the scope of an
7176 identifier with variably modified type nested in the switch. */
7177 gcc_assert (!cs->blocked_stmt_expr);
7179 /* Emit warnings as needed. */
7180 if (EXPR_HAS_LOCATION (cs->switch_expr))
7181 switch_location = EXPR_LOCATION (cs->switch_expr);
7183 switch_location = input_location;
7184 c_do_switch_warnings (cs->cases, switch_location,
7185 TREE_TYPE (cs->switch_expr),
7186 SWITCH_COND (cs->switch_expr));
7188 /* Pop the stack. */
7189 c_switch_stack = cs->next;
7190 splay_tree_delete (cs->cases);
7194 /* Emit an if statement. IF_LOCUS is the location of the 'if'. COND,
7195 THEN_BLOCK and ELSE_BLOCK are expressions to be used; ELSE_BLOCK
7196 may be null. NESTED_IF is true if THEN_BLOCK contains another IF
7197 statement, and was not surrounded with parenthesis. */
7200 c_finish_if_stmt (location_t if_locus, tree cond, tree then_block,
7201 tree else_block, bool nested_if)
7205 /* Diagnose an ambiguous else if if-then-else is nested inside if-then. */
7206 if (warn_parentheses && nested_if && else_block == NULL)
7208 tree inner_if = then_block;
7210 /* We know from the grammar productions that there is an IF nested
7211 within THEN_BLOCK. Due to labels and c99 conditional declarations,
7212 it might not be exactly THEN_BLOCK, but should be the last
7213 non-container statement within. */
7215 switch (TREE_CODE (inner_if))
7220 inner_if = BIND_EXPR_BODY (inner_if);
7222 case STATEMENT_LIST:
7223 inner_if = expr_last (then_block);
7225 case TRY_FINALLY_EXPR:
7226 case TRY_CATCH_EXPR:
7227 inner_if = TREE_OPERAND (inner_if, 0);
7234 if (COND_EXPR_ELSE (inner_if))
7235 warning (OPT_Wparentheses,
7236 "%Hsuggest explicit braces to avoid ambiguous %<else%>",
7240 empty_body_warning (then_block, else_block);
7242 stmt = build3 (COND_EXPR, void_type_node, cond, then_block, else_block);
7243 SET_EXPR_LOCATION (stmt, if_locus);
7247 /* Emit a general-purpose loop construct. START_LOCUS is the location of
7248 the beginning of the loop. COND is the loop condition. COND_IS_FIRST
7249 is false for DO loops. INCR is the FOR increment expression. BODY is
7250 the statement controlled by the loop. BLAB is the break label. CLAB is
7251 the continue label. Everything is allowed to be NULL. */
7254 c_finish_loop (location_t start_locus, tree cond, tree incr, tree body,
7255 tree blab, tree clab, bool cond_is_first)
7257 tree entry = NULL, exit = NULL, t;
7259 /* If the condition is zero don't generate a loop construct. */
7260 if (cond && integer_zerop (cond))
7264 t = build_and_jump (&blab);
7265 SET_EXPR_LOCATION (t, start_locus);
7271 tree top = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
7273 /* If we have an exit condition, then we build an IF with gotos either
7274 out of the loop, or to the top of it. If there's no exit condition,
7275 then we just build a jump back to the top. */
7276 exit = build_and_jump (&LABEL_EXPR_LABEL (top));
7278 if (cond && !integer_nonzerop (cond))
7280 /* Canonicalize the loop condition to the end. This means
7281 generating a branch to the loop condition. Reuse the
7282 continue label, if possible. */
7287 entry = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
7288 t = build_and_jump (&LABEL_EXPR_LABEL (entry));
7291 t = build1 (GOTO_EXPR, void_type_node, clab);
7292 SET_EXPR_LOCATION (t, start_locus);
7296 t = build_and_jump (&blab);
7297 exit = fold_build3 (COND_EXPR, void_type_node, cond, exit, t);
7299 SET_EXPR_LOCATION (exit, start_locus);
7301 SET_EXPR_LOCATION (exit, input_location);
7310 add_stmt (build1 (LABEL_EXPR, void_type_node, clab));
7318 add_stmt (build1 (LABEL_EXPR, void_type_node, blab));
7322 c_finish_bc_stmt (tree *label_p, bool is_break)
7325 tree label = *label_p;
7327 /* In switch statements break is sometimes stylistically used after
7328 a return statement. This can lead to spurious warnings about
7329 control reaching the end of a non-void function when it is
7330 inlined. Note that we are calling block_may_fallthru with
7331 language specific tree nodes; this works because
7332 block_may_fallthru returns true when given something it does not
7334 skip = !block_may_fallthru (cur_stmt_list);
7339 *label_p = label = create_artificial_label ();
7341 else if (TREE_CODE (label) == LABEL_DECL)
7343 else switch (TREE_INT_CST_LOW (label))
7347 error ("break statement not within loop or switch");
7349 error ("continue statement not within a loop");
7353 gcc_assert (is_break);
7354 error ("break statement used with OpenMP for loop");
7364 return add_stmt (build1 (GOTO_EXPR, void_type_node, label));
7367 /* A helper routine for c_process_expr_stmt and c_finish_stmt_expr. */
7370 emit_side_effect_warnings (tree expr)
7372 if (expr == error_mark_node)
7374 else if (!TREE_SIDE_EFFECTS (expr))
7376 if (!VOID_TYPE_P (TREE_TYPE (expr)) && !TREE_NO_WARNING (expr))
7377 warning (0, "%Hstatement with no effect",
7378 EXPR_HAS_LOCATION (expr) ? EXPR_LOCUS (expr) : &input_location);
7380 else if (warn_unused_value)
7381 warn_if_unused_value (expr, input_location);
7384 /* Process an expression as if it were a complete statement. Emit
7385 diagnostics, but do not call ADD_STMT. */
7388 c_process_expr_stmt (tree expr)
7393 if (warn_sequence_point)
7394 verify_sequence_points (expr);
7396 if (TREE_TYPE (expr) != error_mark_node
7397 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
7398 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
7399 error ("expression statement has incomplete type");
7401 /* If we're not processing a statement expression, warn about unused values.
7402 Warnings for statement expressions will be emitted later, once we figure
7403 out which is the result. */
7404 if (!STATEMENT_LIST_STMT_EXPR (cur_stmt_list)
7405 && (extra_warnings || warn_unused_value))
7406 emit_side_effect_warnings (expr);
7408 /* If the expression is not of a type to which we cannot assign a line
7409 number, wrap the thing in a no-op NOP_EXPR. */
7410 if (DECL_P (expr) || CONSTANT_CLASS_P (expr))
7411 expr = build1 (NOP_EXPR, TREE_TYPE (expr), expr);
7414 SET_EXPR_LOCATION (expr, input_location);
7419 /* Emit an expression as a statement. */
7422 c_finish_expr_stmt (tree expr)
7425 return add_stmt (c_process_expr_stmt (expr));
7430 /* Do the opposite and emit a statement as an expression. To begin,
7431 create a new binding level and return it. */
7434 c_begin_stmt_expr (void)
7437 struct c_label_context_se *nstack;
7438 struct c_label_list *glist;
7440 /* We must force a BLOCK for this level so that, if it is not expanded
7441 later, there is a way to turn off the entire subtree of blocks that
7442 are contained in it. */
7444 ret = c_begin_compound_stmt (true);
7447 c_switch_stack->blocked_stmt_expr++;
7448 gcc_assert (c_switch_stack->blocked_stmt_expr != 0);
7450 for (glist = label_context_stack_se->labels_used;
7452 glist = glist->next)
7454 C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 1;
7456 nstack = XOBNEW (&parser_obstack, struct c_label_context_se);
7457 nstack->labels_def = NULL;
7458 nstack->labels_used = NULL;
7459 nstack->next = label_context_stack_se;
7460 label_context_stack_se = nstack;
7462 /* Mark the current statement list as belonging to a statement list. */
7463 STATEMENT_LIST_STMT_EXPR (ret) = 1;
7469 c_finish_stmt_expr (tree body)
7471 tree last, type, tmp, val;
7473 struct c_label_list *dlist, *glist, *glist_prev = NULL;
7475 body = c_end_compound_stmt (body, true);
7478 gcc_assert (c_switch_stack->blocked_stmt_expr != 0);
7479 c_switch_stack->blocked_stmt_expr--;
7481 /* It is no longer possible to jump to labels defined within this
7482 statement expression. */
7483 for (dlist = label_context_stack_se->labels_def;
7485 dlist = dlist->next)
7487 C_DECL_UNJUMPABLE_STMT_EXPR (dlist->label) = 1;
7489 /* It is again possible to define labels with a goto just outside
7490 this statement expression. */
7491 for (glist = label_context_stack_se->next->labels_used;
7493 glist = glist->next)
7495 C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 0;
7498 if (glist_prev != NULL)
7499 glist_prev->next = label_context_stack_se->labels_used;
7501 label_context_stack_se->next->labels_used
7502 = label_context_stack_se->labels_used;
7503 label_context_stack_se = label_context_stack_se->next;
7505 /* Locate the last statement in BODY. See c_end_compound_stmt
7506 about always returning a BIND_EXPR. */
7507 last_p = &BIND_EXPR_BODY (body);
7508 last = BIND_EXPR_BODY (body);
7511 if (TREE_CODE (last) == STATEMENT_LIST)
7513 tree_stmt_iterator i;
7515 /* This can happen with degenerate cases like ({ }). No value. */
7516 if (!TREE_SIDE_EFFECTS (last))
7519 /* If we're supposed to generate side effects warnings, process
7520 all of the statements except the last. */
7521 if (extra_warnings || warn_unused_value)
7523 for (i = tsi_start (last); !tsi_one_before_end_p (i); tsi_next (&i))
7524 emit_side_effect_warnings (tsi_stmt (i));
7527 i = tsi_last (last);
7528 last_p = tsi_stmt_ptr (i);
7532 /* If the end of the list is exception related, then the list was split
7533 by a call to push_cleanup. Continue searching. */
7534 if (TREE_CODE (last) == TRY_FINALLY_EXPR
7535 || TREE_CODE (last) == TRY_CATCH_EXPR)
7537 last_p = &TREE_OPERAND (last, 0);
7539 goto continue_searching;
7542 /* In the case that the BIND_EXPR is not necessary, return the
7543 expression out from inside it. */
7544 if (last == error_mark_node
7545 || (last == BIND_EXPR_BODY (body)
7546 && BIND_EXPR_VARS (body) == NULL))
7548 /* Do not warn if the return value of a statement expression is
7551 TREE_NO_WARNING (last) = 1;
7555 /* Extract the type of said expression. */
7556 type = TREE_TYPE (last);
7558 /* If we're not returning a value at all, then the BIND_EXPR that
7559 we already have is a fine expression to return. */
7560 if (!type || VOID_TYPE_P (type))
7563 /* Now that we've located the expression containing the value, it seems
7564 silly to make voidify_wrapper_expr repeat the process. Create a
7565 temporary of the appropriate type and stick it in a TARGET_EXPR. */
7566 tmp = create_tmp_var_raw (type, NULL);
7568 /* Unwrap a no-op NOP_EXPR as added by c_finish_expr_stmt. This avoids
7569 tree_expr_nonnegative_p giving up immediately. */
7571 if (TREE_CODE (val) == NOP_EXPR
7572 && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)))
7573 val = TREE_OPERAND (val, 0);
7575 *last_p = build2 (MODIFY_EXPR, void_type_node, tmp, val);
7576 SET_EXPR_LOCUS (*last_p, EXPR_LOCUS (last));
7578 return build4 (TARGET_EXPR, type, tmp, body, NULL_TREE, NULL_TREE);
7581 /* Begin the scope of an identifier of variably modified type, scope
7582 number SCOPE. Jumping from outside this scope to inside it is not
7586 c_begin_vm_scope (unsigned int scope)
7588 struct c_label_context_vm *nstack;
7589 struct c_label_list *glist;
7591 gcc_assert (scope > 0);
7593 /* At file_scope, we don't have to do any processing. */
7594 if (label_context_stack_vm == NULL)
7597 if (c_switch_stack && !c_switch_stack->blocked_vm)
7598 c_switch_stack->blocked_vm = scope;
7599 for (glist = label_context_stack_vm->labels_used;
7601 glist = glist->next)
7603 C_DECL_UNDEFINABLE_VM (glist->label) = 1;
7605 nstack = XOBNEW (&parser_obstack, struct c_label_context_vm);
7606 nstack->labels_def = NULL;
7607 nstack->labels_used = NULL;
7608 nstack->scope = scope;
7609 nstack->next = label_context_stack_vm;
7610 label_context_stack_vm = nstack;
7613 /* End a scope which may contain identifiers of variably modified
7614 type, scope number SCOPE. */
7617 c_end_vm_scope (unsigned int scope)
7619 if (label_context_stack_vm == NULL)
7621 if (c_switch_stack && c_switch_stack->blocked_vm == scope)
7622 c_switch_stack->blocked_vm = 0;
7623 /* We may have a number of nested scopes of identifiers with
7624 variably modified type, all at this depth. Pop each in turn. */
7625 while (label_context_stack_vm->scope == scope)
7627 struct c_label_list *dlist, *glist, *glist_prev = NULL;
7629 /* It is no longer possible to jump to labels defined within this
7631 for (dlist = label_context_stack_vm->labels_def;
7633 dlist = dlist->next)
7635 C_DECL_UNJUMPABLE_VM (dlist->label) = 1;
7637 /* It is again possible to define labels with a goto just outside
7639 for (glist = label_context_stack_vm->next->labels_used;
7641 glist = glist->next)
7643 C_DECL_UNDEFINABLE_VM (glist->label) = 0;
7646 if (glist_prev != NULL)
7647 glist_prev->next = label_context_stack_vm->labels_used;
7649 label_context_stack_vm->next->labels_used
7650 = label_context_stack_vm->labels_used;
7651 label_context_stack_vm = label_context_stack_vm->next;
7655 /* Begin and end compound statements. This is as simple as pushing
7656 and popping new statement lists from the tree. */
7659 c_begin_compound_stmt (bool do_scope)
7661 tree stmt = push_stmt_list ();
7668 c_end_compound_stmt (tree stmt, bool do_scope)
7674 if (c_dialect_objc ())
7675 objc_clear_super_receiver ();
7676 block = pop_scope ();
7679 stmt = pop_stmt_list (stmt);
7680 stmt = c_build_bind_expr (block, stmt);
7682 /* If this compound statement is nested immediately inside a statement
7683 expression, then force a BIND_EXPR to be created. Otherwise we'll
7684 do the wrong thing for ({ { 1; } }) or ({ 1; { } }). In particular,
7685 STATEMENT_LISTs merge, and thus we can lose track of what statement
7688 && STATEMENT_LIST_STMT_EXPR (cur_stmt_list)
7689 && TREE_CODE (stmt) != BIND_EXPR)
7691 stmt = build3 (BIND_EXPR, void_type_node, NULL, stmt, NULL);
7692 TREE_SIDE_EFFECTS (stmt) = 1;
7698 /* Queue a cleanup. CLEANUP is an expression/statement to be executed
7699 when the current scope is exited. EH_ONLY is true when this is not
7700 meant to apply to normal control flow transfer. */
7703 push_cleanup (tree ARG_UNUSED (decl), tree cleanup, bool eh_only)
7705 enum tree_code code;
7709 code = eh_only ? TRY_CATCH_EXPR : TRY_FINALLY_EXPR;
7710 stmt = build_stmt (code, NULL, cleanup);
7712 stmt_expr = STATEMENT_LIST_STMT_EXPR (cur_stmt_list);
7713 list = push_stmt_list ();
7714 TREE_OPERAND (stmt, 0) = list;
7715 STATEMENT_LIST_STMT_EXPR (list) = stmt_expr;
7718 /* Build a binary-operation expression without default conversions.
7719 CODE is the kind of expression to build.
7720 This function differs from `build' in several ways:
7721 the data type of the result is computed and recorded in it,
7722 warnings are generated if arg data types are invalid,
7723 special handling for addition and subtraction of pointers is known,
7724 and some optimization is done (operations on narrow ints
7725 are done in the narrower type when that gives the same result).
7726 Constant folding is also done before the result is returned.
7728 Note that the operands will never have enumeral types, or function
7729 or array types, because either they will have the default conversions
7730 performed or they have both just been converted to some other type in which
7731 the arithmetic is to be done. */
7734 build_binary_op (enum tree_code code, tree orig_op0, tree orig_op1,
7738 enum tree_code code0, code1;
7740 const char *invalid_op_diag;
7742 /* Expression code to give to the expression when it is built.
7743 Normally this is CODE, which is what the caller asked for,
7744 but in some special cases we change it. */
7745 enum tree_code resultcode = code;
7747 /* Data type in which the computation is to be performed.
7748 In the simplest cases this is the common type of the arguments. */
7749 tree result_type = NULL;
7751 /* Nonzero means operands have already been type-converted
7752 in whatever way is necessary.
7753 Zero means they need to be converted to RESULT_TYPE. */
7756 /* Nonzero means create the expression with this type, rather than
7758 tree build_type = 0;
7760 /* Nonzero means after finally constructing the expression
7761 convert it to this type. */
7762 tree final_type = 0;
7764 /* Nonzero if this is an operation like MIN or MAX which can
7765 safely be computed in short if both args are promoted shorts.
7766 Also implies COMMON.
7767 -1 indicates a bitwise operation; this makes a difference
7768 in the exact conditions for when it is safe to do the operation
7769 in a narrower mode. */
7772 /* Nonzero if this is a comparison operation;
7773 if both args are promoted shorts, compare the original shorts.
7774 Also implies COMMON. */
7775 int short_compare = 0;
7777 /* Nonzero if this is a right-shift operation, which can be computed on the
7778 original short and then promoted if the operand is a promoted short. */
7779 int short_shift = 0;
7781 /* Nonzero means set RESULT_TYPE to the common type of the args. */
7784 /* True means types are compatible as far as ObjC is concerned. */
7789 op0 = default_conversion (orig_op0);
7790 op1 = default_conversion (orig_op1);
7798 type0 = TREE_TYPE (op0);
7799 type1 = TREE_TYPE (op1);
7801 /* The expression codes of the data types of the arguments tell us
7802 whether the arguments are integers, floating, pointers, etc. */
7803 code0 = TREE_CODE (type0);
7804 code1 = TREE_CODE (type1);
7806 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
7807 STRIP_TYPE_NOPS (op0);
7808 STRIP_TYPE_NOPS (op1);
7810 /* If an error was already reported for one of the arguments,
7811 avoid reporting another error. */
7813 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
7814 return error_mark_node;
7816 if ((invalid_op_diag
7817 = targetm.invalid_binary_op (code, type0, type1)))
7819 error (invalid_op_diag);
7820 return error_mark_node;
7823 objc_ok = objc_compare_types (type0, type1, -3, NULL_TREE);
7828 /* Handle the pointer + int case. */
7829 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
7830 return pointer_int_sum (PLUS_EXPR, op0, op1);
7831 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
7832 return pointer_int_sum (PLUS_EXPR, op1, op0);
7838 /* Subtraction of two similar pointers.
7839 We must subtract them as integers, then divide by object size. */
7840 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
7841 && comp_target_types (type0, type1))
7842 return pointer_diff (op0, op1);
7843 /* Handle pointer minus int. Just like pointer plus int. */
7844 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
7845 return pointer_int_sum (MINUS_EXPR, op0, op1);
7854 case TRUNC_DIV_EXPR:
7856 case FLOOR_DIV_EXPR:
7857 case ROUND_DIV_EXPR:
7858 case EXACT_DIV_EXPR:
7859 /* Floating point division by zero is a legitimate way to obtain
7860 infinities and NaNs. */
7861 if (skip_evaluation == 0 && integer_zerop (op1))
7862 warning (OPT_Wdiv_by_zero, "division by zero");
7864 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
7865 || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
7866 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
7867 || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE))
7869 enum tree_code tcode0 = code0, tcode1 = code1;
7871 if (code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
7872 tcode0 = TREE_CODE (TREE_TYPE (TREE_TYPE (op0)));
7873 if (code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)
7874 tcode1 = TREE_CODE (TREE_TYPE (TREE_TYPE (op1)));
7876 if (!(tcode0 == INTEGER_TYPE && tcode1 == INTEGER_TYPE))
7877 resultcode = RDIV_EXPR;
7879 /* Although it would be tempting to shorten always here, that
7880 loses on some targets, since the modulo instruction is
7881 undefined if the quotient can't be represented in the
7882 computation mode. We shorten only if unsigned or if
7883 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)));
7894 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
7896 else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE)
7900 case TRUNC_MOD_EXPR:
7901 case FLOOR_MOD_EXPR:
7902 if (skip_evaluation == 0 && integer_zerop (op1))
7903 warning (OPT_Wdiv_by_zero, "division by zero");
7905 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
7907 /* Although it would be tempting to shorten always here, that loses
7908 on some targets, since the modulo instruction is undefined if the
7909 quotient can't be represented in the computation mode. We shorten
7910 only if unsigned or if dividing by something we know != -1. */
7911 shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0))
7912 || (TREE_CODE (op1) == INTEGER_CST
7913 && !integer_all_onesp (op1)));
7918 case TRUTH_ANDIF_EXPR:
7919 case TRUTH_ORIF_EXPR:
7920 case TRUTH_AND_EXPR:
7922 case TRUTH_XOR_EXPR:
7923 if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
7924 || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
7925 && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
7926 || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
7928 /* Result of these operations is always an int,
7929 but that does not mean the operands should be
7930 converted to ints! */
7931 result_type = integer_type_node;
7932 op0 = c_common_truthvalue_conversion (op0);
7933 op1 = c_common_truthvalue_conversion (op1);
7938 /* Shift operations: result has same type as first operand;
7939 always convert second operand to int.
7940 Also set SHORT_SHIFT if shifting rightward. */
7943 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
7945 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
7947 if (tree_int_cst_sgn (op1) < 0)
7948 warning (0, "right shift count is negative");
7951 if (!integer_zerop (op1))
7954 if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
7955 warning (0, "right shift count >= width of type");
7959 /* Use the type of the value to be shifted. */
7960 result_type = type0;
7961 /* Convert the shift-count to an integer, regardless of size
7962 of value being shifted. */
7963 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
7964 op1 = convert (integer_type_node, op1);
7965 /* Avoid converting op1 to result_type later. */
7971 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
7973 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
7975 if (tree_int_cst_sgn (op1) < 0)
7976 warning (0, "left shift count is negative");
7978 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
7979 warning (0, "left shift count >= width of type");
7982 /* Use the type of the value to be shifted. */
7983 result_type = type0;
7984 /* Convert the shift-count to an integer, regardless of size
7985 of value being shifted. */
7986 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
7987 op1 = convert (integer_type_node, op1);
7988 /* Avoid converting op1 to result_type later. */
7995 if (code0 == REAL_TYPE || code1 == REAL_TYPE)
7996 warning (OPT_Wfloat_equal,
7997 "comparing floating point with == or != is unsafe");
7998 /* Result of comparison is always int,
7999 but don't convert the args to int! */
8000 build_type = integer_type_node;
8001 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
8002 || code0 == COMPLEX_TYPE)
8003 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
8004 || code1 == COMPLEX_TYPE))
8006 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
8008 tree tt0 = TREE_TYPE (type0);
8009 tree tt1 = TREE_TYPE (type1);
8010 /* Anything compares with void *. void * compares with anything.
8011 Otherwise, the targets must be compatible
8012 and both must be object or both incomplete. */
8013 if (comp_target_types (type0, type1))
8014 result_type = common_pointer_type (type0, type1);
8015 else if (VOID_TYPE_P (tt0))
8017 /* op0 != orig_op0 detects the case of something
8018 whose value is 0 but which isn't a valid null ptr const. */
8019 if (pedantic && !null_pointer_constant_p (orig_op0)
8020 && TREE_CODE (tt1) == FUNCTION_TYPE)
8021 pedwarn ("ISO C forbids comparison of %<void *%>"
8022 " with function pointer");
8024 else if (VOID_TYPE_P (tt1))
8026 if (pedantic && !null_pointer_constant_p (orig_op1)
8027 && TREE_CODE (tt0) == FUNCTION_TYPE)
8028 pedwarn ("ISO C forbids comparison of %<void *%>"
8029 " with function pointer");
8032 /* Avoid warning about the volatile ObjC EH puts on decls. */
8034 pedwarn ("comparison of distinct pointer types lacks a cast");
8036 if (result_type == NULL_TREE)
8037 result_type = ptr_type_node;
8039 else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1))
8041 if (TREE_CODE (op0) == ADDR_EXPR
8042 && DECL_P (TREE_OPERAND (op0, 0))
8043 && (TREE_CODE (TREE_OPERAND (op0, 0)) == PARM_DECL
8044 || TREE_CODE (TREE_OPERAND (op0, 0)) == LABEL_DECL
8045 || !DECL_WEAK (TREE_OPERAND (op0, 0))))
8046 warning (OPT_Waddress, "the address of %qD will never be NULL",
8047 TREE_OPERAND (op0, 0));
8048 result_type = type0;
8050 else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0))
8052 if (TREE_CODE (op1) == ADDR_EXPR
8053 && DECL_P (TREE_OPERAND (op1, 0))
8054 && (TREE_CODE (TREE_OPERAND (op1, 0)) == PARM_DECL
8055 || TREE_CODE (TREE_OPERAND (op1, 0)) == LABEL_DECL
8056 || !DECL_WEAK (TREE_OPERAND (op1, 0))))
8057 warning (OPT_Waddress, "the address of %qD will never be NULL",
8058 TREE_OPERAND (op1, 0));
8059 result_type = type1;
8061 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
8063 result_type = type0;
8064 pedwarn ("comparison between pointer and integer");
8066 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
8068 result_type = type1;
8069 pedwarn ("comparison between pointer and integer");
8077 build_type = integer_type_node;
8078 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
8079 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
8081 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
8083 if (comp_target_types (type0, type1))
8085 result_type = common_pointer_type (type0, type1);
8086 if (!COMPLETE_TYPE_P (TREE_TYPE (type0))
8087 != !COMPLETE_TYPE_P (TREE_TYPE (type1)))
8088 pedwarn ("comparison of complete and incomplete pointers");
8090 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
8091 pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
8095 result_type = ptr_type_node;
8096 pedwarn ("comparison of distinct pointer types lacks a cast");
8099 else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1))
8101 result_type = type0;
8102 if (pedantic || extra_warnings)
8103 pedwarn ("ordered comparison of pointer with integer zero");
8105 else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0))
8107 result_type = type1;
8109 pedwarn ("ordered comparison of pointer with integer zero");
8111 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
8113 result_type = type0;
8114 pedwarn ("comparison between pointer and integer");
8116 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
8118 result_type = type1;
8119 pedwarn ("comparison between pointer and integer");
8127 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
8128 return error_mark_node;
8130 if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
8131 && (!tree_int_cst_equal (TYPE_SIZE (type0), TYPE_SIZE (type1))
8132 || !same_scalar_type_ignoring_signedness (TREE_TYPE (type0),
8133 TREE_TYPE (type1))))
8135 binary_op_error (code);
8136 return error_mark_node;
8139 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE
8140 || code0 == VECTOR_TYPE)
8142 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE
8143 || code1 == VECTOR_TYPE))
8145 int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
8147 if (shorten || common || short_compare)
8148 result_type = c_common_type (type0, type1);
8150 /* For certain operations (which identify themselves by shorten != 0)
8151 if both args were extended from the same smaller type,
8152 do the arithmetic in that type and then extend.
8154 shorten !=0 and !=1 indicates a bitwise operation.
8155 For them, this optimization is safe only if
8156 both args are zero-extended or both are sign-extended.
8157 Otherwise, we might change the result.
8158 Eg, (short)-1 | (unsigned short)-1 is (int)-1
8159 but calculated in (unsigned short) it would be (unsigned short)-1. */
8161 if (shorten && none_complex)
8163 int unsigned0, unsigned1;
8168 /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents
8169 excessive narrowing when we call get_narrower below. For
8170 example, suppose that OP0 is of unsigned int extended
8171 from signed char and that RESULT_TYPE is long long int.
8172 If we explicitly cast OP0 to RESULT_TYPE, OP0 would look
8175 (long long int) (unsigned int) signed_char
8177 which get_narrower would narrow down to
8179 (unsigned int) signed char
8181 If we do not cast OP0 first, get_narrower would return
8182 signed_char, which is inconsistent with the case of the
8184 op0 = convert (result_type, op0);
8185 op1 = convert (result_type, op1);
8187 arg0 = get_narrower (op0, &unsigned0);
8188 arg1 = get_narrower (op1, &unsigned1);
8190 /* UNS is 1 if the operation to be done is an unsigned one. */
8191 uns = TYPE_UNSIGNED (result_type);
8193 final_type = result_type;
8195 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
8196 but it *requires* conversion to FINAL_TYPE. */
8198 if ((TYPE_PRECISION (TREE_TYPE (op0))
8199 == TYPE_PRECISION (TREE_TYPE (arg0)))
8200 && TREE_TYPE (op0) != final_type)
8201 unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
8202 if ((TYPE_PRECISION (TREE_TYPE (op1))
8203 == TYPE_PRECISION (TREE_TYPE (arg1)))
8204 && TREE_TYPE (op1) != final_type)
8205 unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
8207 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
8209 /* For bitwise operations, signedness of nominal type
8210 does not matter. Consider only how operands were extended. */
8214 /* Note that in all three cases below we refrain from optimizing
8215 an unsigned operation on sign-extended args.
8216 That would not be valid. */
8218 /* Both args variable: if both extended in same way
8219 from same width, do it in that width.
8220 Do it unsigned if args were zero-extended. */
8221 if ((TYPE_PRECISION (TREE_TYPE (arg0))
8222 < TYPE_PRECISION (result_type))
8223 && (TYPE_PRECISION (TREE_TYPE (arg1))
8224 == TYPE_PRECISION (TREE_TYPE (arg0)))
8225 && unsigned0 == unsigned1
8226 && (unsigned0 || !uns))
8228 = c_common_signed_or_unsigned_type
8229 (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
8230 else if (TREE_CODE (arg0) == INTEGER_CST
8231 && (unsigned1 || !uns)
8232 && (TYPE_PRECISION (TREE_TYPE (arg1))
8233 < TYPE_PRECISION (result_type))
8235 = c_common_signed_or_unsigned_type (unsigned1,
8237 int_fits_type_p (arg0, type)))
8239 else if (TREE_CODE (arg1) == INTEGER_CST
8240 && (unsigned0 || !uns)
8241 && (TYPE_PRECISION (TREE_TYPE (arg0))
8242 < TYPE_PRECISION (result_type))
8244 = c_common_signed_or_unsigned_type (unsigned0,
8246 int_fits_type_p (arg1, type)))
8250 /* Shifts can be shortened if shifting right. */
8255 tree arg0 = get_narrower (op0, &unsigned_arg);
8257 final_type = result_type;
8259 if (arg0 == op0 && final_type == TREE_TYPE (op0))
8260 unsigned_arg = TYPE_UNSIGNED (TREE_TYPE (op0));
8262 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
8263 /* We can shorten only if the shift count is less than the
8264 number of bits in the smaller type size. */
8265 && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
8266 /* We cannot drop an unsigned shift after sign-extension. */
8267 && (!TYPE_UNSIGNED (final_type) || unsigned_arg))
8269 /* Do an unsigned shift if the operand was zero-extended. */
8271 = c_common_signed_or_unsigned_type (unsigned_arg,
8273 /* Convert value-to-be-shifted to that type. */
8274 if (TREE_TYPE (op0) != result_type)
8275 op0 = convert (result_type, op0);
8280 /* Comparison operations are shortened too but differently.
8281 They identify themselves by setting short_compare = 1. */
8285 /* Don't write &op0, etc., because that would prevent op0
8286 from being kept in a register.
8287 Instead, make copies of the our local variables and
8288 pass the copies by reference, then copy them back afterward. */
8289 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
8290 enum tree_code xresultcode = resultcode;
8292 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
8297 op0 = xop0, op1 = xop1;
8299 resultcode = xresultcode;
8301 if (warn_sign_compare && skip_evaluation == 0)
8303 int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0));
8304 int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1));
8305 int unsignedp0, unsignedp1;
8306 tree primop0 = get_narrower (op0, &unsignedp0);
8307 tree primop1 = get_narrower (op1, &unsignedp1);
8311 STRIP_TYPE_NOPS (xop0);
8312 STRIP_TYPE_NOPS (xop1);
8314 /* Give warnings for comparisons between signed and unsigned
8315 quantities that may fail.
8317 Do the checking based on the original operand trees, so that
8318 casts will be considered, but default promotions won't be.
8320 Do not warn if the comparison is being done in a signed type,
8321 since the signed type will only be chosen if it can represent
8322 all the values of the unsigned type. */
8323 if (!TYPE_UNSIGNED (result_type))
8325 /* Do not warn if both operands are the same signedness. */
8326 else if (op0_signed == op1_signed)
8334 sop = xop0, uop = xop1;
8336 sop = xop1, uop = xop0;
8338 /* Do not warn if the signed quantity is an
8339 unsuffixed integer literal (or some static
8340 constant expression involving such literals or a
8341 conditional expression involving such literals)
8342 and it is non-negative. */
8343 if (tree_expr_nonnegative_warnv_p (sop, &ovf))
8345 /* Do not warn if the comparison is an equality operation,
8346 the unsigned quantity is an integral constant, and it
8347 would fit in the result if the result were signed. */
8348 else if (TREE_CODE (uop) == INTEGER_CST
8349 && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
8351 (uop, c_common_signed_type (result_type)))
8353 /* Do not warn if the unsigned quantity is an enumeration
8354 constant and its maximum value would fit in the result
8355 if the result were signed. */
8356 else if (TREE_CODE (uop) == INTEGER_CST
8357 && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
8359 (TYPE_MAX_VALUE (TREE_TYPE (uop)),
8360 c_common_signed_type (result_type)))
8363 warning (0, "comparison between signed and unsigned");
8366 /* Warn if two unsigned values are being compared in a size
8367 larger than their original size, and one (and only one) is the
8368 result of a `~' operator. This comparison will always fail.
8370 Also warn if one operand is a constant, and the constant
8371 does not have all bits set that are set in the ~ operand
8372 when it is extended. */
8374 if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
8375 != (TREE_CODE (primop1) == BIT_NOT_EXPR))
8377 if (TREE_CODE (primop0) == BIT_NOT_EXPR)
8378 primop0 = get_narrower (TREE_OPERAND (primop0, 0),
8381 primop1 = get_narrower (TREE_OPERAND (primop1, 0),
8384 if (host_integerp (primop0, 0) || host_integerp (primop1, 0))
8387 HOST_WIDE_INT constant, mask;
8388 int unsignedp, bits;
8390 if (host_integerp (primop0, 0))
8393 unsignedp = unsignedp1;
8394 constant = tree_low_cst (primop0, 0);
8399 unsignedp = unsignedp0;
8400 constant = tree_low_cst (primop1, 0);
8403 bits = TYPE_PRECISION (TREE_TYPE (primop));
8404 if (bits < TYPE_PRECISION (result_type)
8405 && bits < HOST_BITS_PER_WIDE_INT && unsignedp)
8407 mask = (~(HOST_WIDE_INT) 0) << bits;
8408 if ((mask & constant) != mask)
8409 warning (0, "comparison of promoted ~unsigned with constant");
8412 else if (unsignedp0 && unsignedp1
8413 && (TYPE_PRECISION (TREE_TYPE (primop0))
8414 < TYPE_PRECISION (result_type))
8415 && (TYPE_PRECISION (TREE_TYPE (primop1))
8416 < TYPE_PRECISION (result_type)))
8417 warning (0, "comparison of promoted ~unsigned with unsigned");
8423 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
8424 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
8425 Then the expression will be built.
8426 It will be given type FINAL_TYPE if that is nonzero;
8427 otherwise, it will be given type RESULT_TYPE. */
8431 binary_op_error (code);
8432 return error_mark_node;
8437 if (TREE_TYPE (op0) != result_type)
8438 op0 = convert_and_check (result_type, op0);
8439 if (TREE_TYPE (op1) != result_type)
8440 op1 = convert_and_check (result_type, op1);
8442 /* This can happen if one operand has a vector type, and the other
8443 has a different type. */
8444 if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK)
8445 return error_mark_node;
8448 if (build_type == NULL_TREE)
8449 build_type = result_type;
8452 /* Treat expressions in initializers specially as they can't trap. */
8453 tree result = require_constant_value ? fold_build2_initializer (resultcode,
8456 : fold_build2 (resultcode, build_type,
8459 if (final_type != 0)
8460 result = convert (final_type, result);
8466 /* Convert EXPR to be a truth-value, validating its type for this
8470 c_objc_common_truthvalue_conversion (tree expr)
8472 switch (TREE_CODE (TREE_TYPE (expr)))
8475 error ("used array that cannot be converted to pointer where scalar is required");
8476 return error_mark_node;
8479 error ("used struct type value where scalar is required");
8480 return error_mark_node;
8483 error ("used union type value where scalar is required");
8484 return error_mark_node;
8493 /* ??? Should we also give an error for void and vectors rather than
8494 leaving those to give errors later? */
8495 return c_common_truthvalue_conversion (expr);
8499 /* Convert EXPR to a contained DECL, updating *TC, *TI and *SE as
8503 c_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED,
8504 bool *ti ATTRIBUTE_UNUSED, bool *se)
8506 if (TREE_CODE (expr) == COMPOUND_LITERAL_EXPR)
8508 tree decl = COMPOUND_LITERAL_EXPR_DECL (expr);
8509 /* Executing a compound literal inside a function reinitializes
8511 if (!TREE_STATIC (decl))
8519 /* Like c_begin_compound_stmt, except force the retention of the BLOCK. */
8522 c_begin_omp_parallel (void)
8527 block = c_begin_compound_stmt (true);
8533 c_finish_omp_parallel (tree clauses, tree block)
8537 block = c_end_compound_stmt (block, true);
8539 stmt = make_node (OMP_PARALLEL);
8540 TREE_TYPE (stmt) = void_type_node;
8541 OMP_PARALLEL_CLAUSES (stmt) = clauses;
8542 OMP_PARALLEL_BODY (stmt) = block;
8544 return add_stmt (stmt);
8547 /* For all elements of CLAUSES, validate them vs OpenMP constraints.
8548 Remove any elements from the list that are invalid. */
8551 c_finish_omp_clauses (tree clauses)
8553 bitmap_head generic_head, firstprivate_head, lastprivate_head;
8554 tree c, t, *pc = &clauses;
8557 bitmap_obstack_initialize (NULL);
8558 bitmap_initialize (&generic_head, &bitmap_default_obstack);
8559 bitmap_initialize (&firstprivate_head, &bitmap_default_obstack);
8560 bitmap_initialize (&lastprivate_head, &bitmap_default_obstack);
8562 for (pc = &clauses, c = clauses; c ; c = *pc)
8564 bool remove = false;
8565 bool need_complete = false;
8566 bool need_implicitly_determined = false;
8568 switch (OMP_CLAUSE_CODE (c))
8570 case OMP_CLAUSE_SHARED:
8572 need_implicitly_determined = true;
8573 goto check_dup_generic;
8575 case OMP_CLAUSE_PRIVATE:
8577 need_complete = true;
8578 need_implicitly_determined = true;
8579 goto check_dup_generic;
8581 case OMP_CLAUSE_REDUCTION:
8583 need_implicitly_determined = true;
8584 t = OMP_CLAUSE_DECL (c);
8585 if (AGGREGATE_TYPE_P (TREE_TYPE (t))
8586 || POINTER_TYPE_P (TREE_TYPE (t)))
8588 error ("%qE has invalid type for %<reduction%>", t);
8591 else if (FLOAT_TYPE_P (TREE_TYPE (t)))
8593 enum tree_code r_code = OMP_CLAUSE_REDUCTION_CODE (c);
8594 const char *r_name = NULL;
8611 case TRUTH_ANDIF_EXPR:
8614 case TRUTH_ORIF_EXPR:
8622 error ("%qE has invalid type for %<reduction(%s)%>",
8627 goto check_dup_generic;
8629 case OMP_CLAUSE_COPYPRIVATE:
8630 name = "copyprivate";
8631 goto check_dup_generic;
8633 case OMP_CLAUSE_COPYIN:
8635 t = OMP_CLAUSE_DECL (c);
8636 if (TREE_CODE (t) != VAR_DECL || !DECL_THREAD_LOCAL_P (t))
8638 error ("%qE must be %<threadprivate%> for %<copyin%>", t);
8641 goto check_dup_generic;
8644 t = OMP_CLAUSE_DECL (c);
8645 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
8647 error ("%qE is not a variable in clause %qs", t, name);
8650 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
8651 || bitmap_bit_p (&firstprivate_head, DECL_UID (t))
8652 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
8654 error ("%qE appears more than once in data clauses", t);
8658 bitmap_set_bit (&generic_head, DECL_UID (t));
8661 case OMP_CLAUSE_FIRSTPRIVATE:
8662 name = "firstprivate";
8663 t = OMP_CLAUSE_DECL (c);
8664 need_complete = true;
8665 need_implicitly_determined = true;
8666 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
8668 error ("%qE is not a variable in clause %<firstprivate%>", t);
8671 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
8672 || bitmap_bit_p (&firstprivate_head, DECL_UID (t)))
8674 error ("%qE appears more than once in data clauses", t);
8678 bitmap_set_bit (&firstprivate_head, DECL_UID (t));
8681 case OMP_CLAUSE_LASTPRIVATE:
8682 name = "lastprivate";
8683 t = OMP_CLAUSE_DECL (c);
8684 need_complete = true;
8685 need_implicitly_determined = true;
8686 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
8688 error ("%qE is not a variable in clause %<lastprivate%>", t);
8691 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
8692 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
8694 error ("%qE appears more than once in data clauses", t);
8698 bitmap_set_bit (&lastprivate_head, DECL_UID (t));
8702 case OMP_CLAUSE_NUM_THREADS:
8703 case OMP_CLAUSE_SCHEDULE:
8704 case OMP_CLAUSE_NOWAIT:
8705 case OMP_CLAUSE_ORDERED:
8706 case OMP_CLAUSE_DEFAULT:
8707 pc = &OMP_CLAUSE_CHAIN (c);
8716 t = OMP_CLAUSE_DECL (c);
8720 t = require_complete_type (t);
8721 if (t == error_mark_node)
8725 if (need_implicitly_determined)
8727 const char *share_name = NULL;
8729 if (TREE_CODE (t) == VAR_DECL && DECL_THREAD_LOCAL_P (t))
8730 share_name = "threadprivate";
8731 else switch (c_omp_predetermined_sharing (t))
8733 case OMP_CLAUSE_DEFAULT_UNSPECIFIED:
8735 case OMP_CLAUSE_DEFAULT_SHARED:
8736 share_name = "shared";
8738 case OMP_CLAUSE_DEFAULT_PRIVATE:
8739 share_name = "private";
8746 error ("%qE is predetermined %qs for %qs",
8747 t, share_name, name);
8754 *pc = OMP_CLAUSE_CHAIN (c);
8756 pc = &OMP_CLAUSE_CHAIN (c);
8759 bitmap_obstack_release (NULL);