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, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file is part of the C front end.
24 It contains routines to build C expressions given their operands,
25 including computing the types of the result, C-specific error checks,
26 and some optimization. */
30 #include "coretypes.h"
34 #include "langhooks.h"
44 #include "tree-iterator.h"
46 #include "tree-flow.h"
48 /* Possible cases of implicit bad conversions. Used to select
49 diagnostic messages in convert_for_assignment. */
57 /* Whether we are building a boolean conversion inside
58 convert_for_assignment, or some other late binary operation. If
59 build_binary_op is called (from code shared with C++) in this case,
60 then the operands have already been folded and the result will not
61 be folded again, so C_MAYBE_CONST_EXPR should not be generated. */
62 bool in_late_binary_op;
64 /* The level of nesting inside "__alignof__". */
67 /* The level of nesting inside "sizeof". */
70 /* The level of nesting inside "typeof". */
73 struct c_label_context_se *label_context_stack_se;
74 struct c_label_context_vm *label_context_stack_vm;
76 /* Nonzero if we've already printed a "missing braces around initializer"
77 message within this initializer. */
78 static int missing_braces_mentioned;
80 static int require_constant_value;
81 static int require_constant_elements;
83 static bool null_pointer_constant_p (const_tree);
84 static tree qualify_type (tree, tree);
85 static int tagged_types_tu_compatible_p (const_tree, const_tree);
86 static int comp_target_types (tree, tree);
87 static int function_types_compatible_p (const_tree, const_tree);
88 static int type_lists_compatible_p (const_tree, const_tree);
89 static tree lookup_field (tree, tree);
90 static int convert_arguments (tree, VEC(tree,gc) *, VEC(tree,gc) *, tree,
92 static tree pointer_diff (tree, tree);
93 static tree convert_for_assignment (tree, tree, tree, enum impl_conv, bool,
95 static tree valid_compound_expr_initializer (tree, tree);
96 static void push_string (const char *);
97 static void push_member_name (tree);
98 static int spelling_length (void);
99 static char *print_spelling (char *);
100 static void warning_init (int, const char *);
101 static tree digest_init (tree, tree, tree, bool, bool, int);
102 static void output_init_element (tree, tree, bool, tree, tree, int, bool);
103 static void output_pending_init_elements (int);
104 static int set_designator (int);
105 static void push_range_stack (tree);
106 static void add_pending_init (tree, tree, tree, bool);
107 static void set_nonincremental_init (void);
108 static void set_nonincremental_init_from_string (tree);
109 static tree find_init_member (tree);
110 static void readonly_error (tree, enum lvalue_use);
111 static void readonly_warning (tree, enum lvalue_use);
112 static int lvalue_or_else (const_tree, enum lvalue_use);
113 static void record_maybe_used_decl (tree);
114 static int comptypes_internal (const_tree, const_tree);
116 /* Return true if EXP is a null pointer constant, false otherwise. */
119 null_pointer_constant_p (const_tree expr)
121 /* This should really operate on c_expr structures, but they aren't
122 yet available everywhere required. */
123 tree type = TREE_TYPE (expr);
124 return (TREE_CODE (expr) == INTEGER_CST
125 && !TREE_OVERFLOW (expr)
126 && integer_zerop (expr)
127 && (INTEGRAL_TYPE_P (type)
128 || (TREE_CODE (type) == POINTER_TYPE
129 && VOID_TYPE_P (TREE_TYPE (type))
130 && TYPE_QUALS (TREE_TYPE (type)) == TYPE_UNQUALIFIED)));
133 /* EXPR may appear in an unevaluated part of an integer constant
134 expression, but not in an evaluated part. Wrap it in a
135 C_MAYBE_CONST_EXPR, or mark it with TREE_OVERFLOW if it is just an
136 INTEGER_CST and we cannot create a C_MAYBE_CONST_EXPR. */
139 note_integer_operands (tree expr)
142 if (TREE_CODE (expr) == INTEGER_CST && in_late_binary_op)
144 ret = copy_node (expr);
145 TREE_OVERFLOW (ret) = 1;
149 ret = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (expr), NULL_TREE, expr);
150 C_MAYBE_CONST_EXPR_INT_OPERANDS (ret) = 1;
155 /* Having checked whether EXPR may appear in an unevaluated part of an
156 integer constant expression and found that it may, remove any
157 C_MAYBE_CONST_EXPR noting this fact and return the resulting
161 remove_c_maybe_const_expr (tree expr)
163 if (TREE_CODE (expr) == C_MAYBE_CONST_EXPR)
164 return C_MAYBE_CONST_EXPR_EXPR (expr);
169 \f/* This is a cache to hold if two types are compatible or not. */
171 struct tagged_tu_seen_cache {
172 const struct tagged_tu_seen_cache * next;
175 /* The return value of tagged_types_tu_compatible_p if we had seen
176 these two types already. */
180 static const struct tagged_tu_seen_cache * tagged_tu_seen_base;
181 static void free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *);
183 /* Do `exp = require_complete_type (exp);' to make sure exp
184 does not have an incomplete type. (That includes void types.) */
187 require_complete_type (tree value)
189 tree type = TREE_TYPE (value);
191 if (value == error_mark_node || type == error_mark_node)
192 return error_mark_node;
194 /* First, detect a valid value with a complete type. */
195 if (COMPLETE_TYPE_P (type))
198 c_incomplete_type_error (value, type);
199 return error_mark_node;
202 /* Print an error message for invalid use of an incomplete type.
203 VALUE is the expression that was used (or 0 if that isn't known)
204 and TYPE is the type that was invalid. */
207 c_incomplete_type_error (const_tree value, const_tree type)
209 const char *type_code_string;
211 /* Avoid duplicate error message. */
212 if (TREE_CODE (type) == ERROR_MARK)
215 if (value != 0 && (TREE_CODE (value) == VAR_DECL
216 || TREE_CODE (value) == PARM_DECL))
217 error ("%qD has an incomplete type", value);
221 /* We must print an error message. Be clever about what it says. */
223 switch (TREE_CODE (type))
226 type_code_string = "struct";
230 type_code_string = "union";
234 type_code_string = "enum";
238 error ("invalid use of void expression");
242 if (TYPE_DOMAIN (type))
244 if (TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL)
246 error ("invalid use of flexible array member");
249 type = TREE_TYPE (type);
252 error ("invalid use of array with unspecified bounds");
259 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
260 error ("invalid use of undefined type %<%s %E%>",
261 type_code_string, TYPE_NAME (type));
263 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
264 error ("invalid use of incomplete typedef %qD", TYPE_NAME (type));
268 /* Given a type, apply default promotions wrt unnamed function
269 arguments and return the new type. */
272 c_type_promotes_to (tree type)
274 if (TYPE_MAIN_VARIANT (type) == float_type_node)
275 return double_type_node;
277 if (c_promoting_integer_type_p (type))
279 /* Preserve unsignedness if not really getting any wider. */
280 if (TYPE_UNSIGNED (type)
281 && (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
282 return unsigned_type_node;
283 return integer_type_node;
289 /* Return a variant of TYPE which has all the type qualifiers of LIKE
290 as well as those of TYPE. */
293 qualify_type (tree type, tree like)
295 return c_build_qualified_type (type,
296 TYPE_QUALS (type) | TYPE_QUALS (like));
299 /* Return true iff the given tree T is a variable length array. */
302 c_vla_type_p (const_tree t)
304 if (TREE_CODE (t) == ARRAY_TYPE
305 && C_TYPE_VARIABLE_SIZE (t))
310 /* Return the composite type of two compatible types.
312 We assume that comptypes has already been done and returned
313 nonzero; if that isn't so, this may crash. In particular, we
314 assume that qualifiers match. */
317 composite_type (tree t1, tree t2)
319 enum tree_code code1;
320 enum tree_code code2;
323 /* Save time if the two types are the same. */
325 if (t1 == t2) return t1;
327 /* If one type is nonsense, use the other. */
328 if (t1 == error_mark_node)
330 if (t2 == error_mark_node)
333 code1 = TREE_CODE (t1);
334 code2 = TREE_CODE (t2);
336 /* Merge the attributes. */
337 attributes = targetm.merge_type_attributes (t1, t2);
339 /* If one is an enumerated type and the other is the compatible
340 integer type, the composite type might be either of the two
341 (DR#013 question 3). For consistency, use the enumerated type as
342 the composite type. */
344 if (code1 == ENUMERAL_TYPE && code2 == INTEGER_TYPE)
346 if (code2 == ENUMERAL_TYPE && code1 == INTEGER_TYPE)
349 gcc_assert (code1 == code2);
354 /* For two pointers, do this recursively on the target type. */
356 tree pointed_to_1 = TREE_TYPE (t1);
357 tree pointed_to_2 = TREE_TYPE (t2);
358 tree target = composite_type (pointed_to_1, pointed_to_2);
359 t1 = build_pointer_type (target);
360 t1 = build_type_attribute_variant (t1, attributes);
361 return qualify_type (t1, t2);
366 tree elt = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
369 tree d1 = TYPE_DOMAIN (t1);
370 tree d2 = TYPE_DOMAIN (t2);
371 bool d1_variable, d2_variable;
372 bool d1_zero, d2_zero;
373 bool t1_complete, t2_complete;
375 /* We should not have any type quals on arrays at all. */
376 gcc_assert (!TYPE_QUALS (t1) && !TYPE_QUALS (t2));
378 t1_complete = COMPLETE_TYPE_P (t1);
379 t2_complete = COMPLETE_TYPE_P (t2);
381 d1_zero = d1 == 0 || !TYPE_MAX_VALUE (d1);
382 d2_zero = d2 == 0 || !TYPE_MAX_VALUE (d2);
384 d1_variable = (!d1_zero
385 && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
386 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST));
387 d2_variable = (!d2_zero
388 && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
389 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST));
390 d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1));
391 d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2));
393 /* Save space: see if the result is identical to one of the args. */
394 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)
395 && (d2_variable || d2_zero || !d1_variable))
396 return build_type_attribute_variant (t1, attributes);
397 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)
398 && (d1_variable || d1_zero || !d2_variable))
399 return build_type_attribute_variant (t2, attributes);
401 if (elt == TREE_TYPE (t1) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1))
402 return build_type_attribute_variant (t1, attributes);
403 if (elt == TREE_TYPE (t2) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1))
404 return build_type_attribute_variant (t2, attributes);
406 /* Merge the element types, and have a size if either arg has
407 one. We may have qualifiers on the element types. To set
408 up TYPE_MAIN_VARIANT correctly, we need to form the
409 composite of the unqualified types and add the qualifiers
411 quals = TYPE_QUALS (strip_array_types (elt));
412 unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED);
413 t1 = build_array_type (unqual_elt,
414 TYPE_DOMAIN ((TYPE_DOMAIN (t1)
420 /* Ensure a composite type involving a zero-length array type
421 is a zero-length type not an incomplete type. */
422 if (d1_zero && d2_zero
423 && (t1_complete || t2_complete)
424 && !COMPLETE_TYPE_P (t1))
426 TYPE_SIZE (t1) = bitsize_zero_node;
427 TYPE_SIZE_UNIT (t1) = size_zero_node;
429 t1 = c_build_qualified_type (t1, quals);
430 return build_type_attribute_variant (t1, attributes);
436 if (attributes != NULL)
438 /* Try harder not to create a new aggregate type. */
439 if (attribute_list_equal (TYPE_ATTRIBUTES (t1), attributes))
441 if (attribute_list_equal (TYPE_ATTRIBUTES (t2), attributes))
444 return build_type_attribute_variant (t1, attributes);
447 /* Function types: prefer the one that specified arg types.
448 If both do, merge the arg types. Also merge the return types. */
450 tree valtype = composite_type (TREE_TYPE (t1), TREE_TYPE (t2));
451 tree p1 = TYPE_ARG_TYPES (t1);
452 tree p2 = TYPE_ARG_TYPES (t2);
457 /* Save space: see if the result is identical to one of the args. */
458 if (valtype == TREE_TYPE (t1) && !TYPE_ARG_TYPES (t2))
459 return build_type_attribute_variant (t1, attributes);
460 if (valtype == TREE_TYPE (t2) && !TYPE_ARG_TYPES (t1))
461 return build_type_attribute_variant (t2, attributes);
463 /* Simple way if one arg fails to specify argument types. */
464 if (TYPE_ARG_TYPES (t1) == 0)
466 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2));
467 t1 = build_type_attribute_variant (t1, attributes);
468 return qualify_type (t1, t2);
470 if (TYPE_ARG_TYPES (t2) == 0)
472 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1));
473 t1 = build_type_attribute_variant (t1, attributes);
474 return qualify_type (t1, t2);
477 /* If both args specify argument types, we must merge the two
478 lists, argument by argument. */
479 /* Tell global_bindings_p to return false so that variable_size
480 doesn't die on VLAs in parameter types. */
481 c_override_global_bindings_to_false = true;
483 len = list_length (p1);
486 for (i = 0; i < len; i++)
487 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
492 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n))
494 /* A null type means arg type is not specified.
495 Take whatever the other function type has. */
496 if (TREE_VALUE (p1) == 0)
498 TREE_VALUE (n) = TREE_VALUE (p2);
501 if (TREE_VALUE (p2) == 0)
503 TREE_VALUE (n) = TREE_VALUE (p1);
507 /* Given wait (union {union wait *u; int *i} *)
508 and wait (union wait *),
509 prefer union wait * as type of parm. */
510 if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE
511 && TREE_VALUE (p1) != TREE_VALUE (p2))
514 tree mv2 = TREE_VALUE (p2);
515 if (mv2 && mv2 != error_mark_node
516 && TREE_CODE (mv2) != ARRAY_TYPE)
517 mv2 = TYPE_MAIN_VARIANT (mv2);
518 for (memb = TYPE_FIELDS (TREE_VALUE (p1));
519 memb; memb = TREE_CHAIN (memb))
521 tree mv3 = TREE_TYPE (memb);
522 if (mv3 && mv3 != error_mark_node
523 && TREE_CODE (mv3) != ARRAY_TYPE)
524 mv3 = TYPE_MAIN_VARIANT (mv3);
525 if (comptypes (mv3, mv2))
527 TREE_VALUE (n) = composite_type (TREE_TYPE (memb),
529 pedwarn (input_location, OPT_pedantic,
530 "function types not truly compatible in ISO C");
535 if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE
536 && TREE_VALUE (p2) != TREE_VALUE (p1))
539 tree mv1 = TREE_VALUE (p1);
540 if (mv1 && mv1 != error_mark_node
541 && TREE_CODE (mv1) != ARRAY_TYPE)
542 mv1 = TYPE_MAIN_VARIANT (mv1);
543 for (memb = TYPE_FIELDS (TREE_VALUE (p2));
544 memb; memb = TREE_CHAIN (memb))
546 tree mv3 = TREE_TYPE (memb);
547 if (mv3 && mv3 != error_mark_node
548 && TREE_CODE (mv3) != ARRAY_TYPE)
549 mv3 = TYPE_MAIN_VARIANT (mv3);
550 if (comptypes (mv3, mv1))
552 TREE_VALUE (n) = composite_type (TREE_TYPE (memb),
554 pedwarn (input_location, OPT_pedantic,
555 "function types not truly compatible in ISO C");
560 TREE_VALUE (n) = composite_type (TREE_VALUE (p1), TREE_VALUE (p2));
564 c_override_global_bindings_to_false = false;
565 t1 = build_function_type (valtype, newargs);
566 t1 = qualify_type (t1, t2);
567 /* ... falls through ... */
571 return build_type_attribute_variant (t1, attributes);
576 /* Return the type of a conditional expression between pointers to
577 possibly differently qualified versions of compatible types.
579 We assume that comp_target_types has already been done and returned
580 nonzero; if that isn't so, this may crash. */
583 common_pointer_type (tree t1, tree t2)
586 tree pointed_to_1, mv1;
587 tree pointed_to_2, mv2;
589 unsigned target_quals;
591 /* Save time if the two types are the same. */
593 if (t1 == t2) return t1;
595 /* If one type is nonsense, use the other. */
596 if (t1 == error_mark_node)
598 if (t2 == error_mark_node)
601 gcc_assert (TREE_CODE (t1) == POINTER_TYPE
602 && TREE_CODE (t2) == POINTER_TYPE);
604 /* Merge the attributes. */
605 attributes = targetm.merge_type_attributes (t1, t2);
607 /* Find the composite type of the target types, and combine the
608 qualifiers of the two types' targets. Do not lose qualifiers on
609 array element types by taking the TYPE_MAIN_VARIANT. */
610 mv1 = pointed_to_1 = TREE_TYPE (t1);
611 mv2 = pointed_to_2 = TREE_TYPE (t2);
612 if (TREE_CODE (mv1) != ARRAY_TYPE)
613 mv1 = TYPE_MAIN_VARIANT (pointed_to_1);
614 if (TREE_CODE (mv2) != ARRAY_TYPE)
615 mv2 = TYPE_MAIN_VARIANT (pointed_to_2);
616 target = composite_type (mv1, mv2);
618 /* For function types do not merge const qualifiers, but drop them
619 if used inconsistently. The middle-end uses these to mark const
620 and noreturn functions. */
621 if (TREE_CODE (pointed_to_1) == FUNCTION_TYPE)
622 target_quals = TYPE_QUALS (pointed_to_1) & TYPE_QUALS (pointed_to_2);
624 target_quals = TYPE_QUALS (pointed_to_1) | TYPE_QUALS (pointed_to_2);
625 t1 = build_pointer_type (c_build_qualified_type (target, target_quals));
626 return build_type_attribute_variant (t1, attributes);
629 /* Return the common type for two arithmetic types under the usual
630 arithmetic conversions. The default conversions have already been
631 applied, and enumerated types converted to their compatible integer
632 types. The resulting type is unqualified and has no attributes.
634 This is the type for the result of most arithmetic operations
635 if the operands have the given two types. */
638 c_common_type (tree t1, tree t2)
640 enum tree_code code1;
641 enum tree_code code2;
643 /* If one type is nonsense, use the other. */
644 if (t1 == error_mark_node)
646 if (t2 == error_mark_node)
649 if (TYPE_QUALS (t1) != TYPE_UNQUALIFIED)
650 t1 = TYPE_MAIN_VARIANT (t1);
652 if (TYPE_QUALS (t2) != TYPE_UNQUALIFIED)
653 t2 = TYPE_MAIN_VARIANT (t2);
655 if (TYPE_ATTRIBUTES (t1) != NULL_TREE)
656 t1 = build_type_attribute_variant (t1, NULL_TREE);
658 if (TYPE_ATTRIBUTES (t2) != NULL_TREE)
659 t2 = build_type_attribute_variant (t2, NULL_TREE);
661 /* Save time if the two types are the same. */
663 if (t1 == t2) return t1;
665 code1 = TREE_CODE (t1);
666 code2 = TREE_CODE (t2);
668 gcc_assert (code1 == VECTOR_TYPE || code1 == COMPLEX_TYPE
669 || code1 == FIXED_POINT_TYPE || code1 == REAL_TYPE
670 || code1 == INTEGER_TYPE);
671 gcc_assert (code2 == VECTOR_TYPE || code2 == COMPLEX_TYPE
672 || code2 == FIXED_POINT_TYPE || code2 == REAL_TYPE
673 || code2 == INTEGER_TYPE);
675 /* When one operand is a decimal float type, the other operand cannot be
676 a generic float type or a complex type. We also disallow vector types
678 if ((DECIMAL_FLOAT_TYPE_P (t1) || DECIMAL_FLOAT_TYPE_P (t2))
679 && !(DECIMAL_FLOAT_TYPE_P (t1) && DECIMAL_FLOAT_TYPE_P (t2)))
681 if (code1 == VECTOR_TYPE || code2 == VECTOR_TYPE)
683 error ("can%'t mix operands of decimal float and vector types");
684 return error_mark_node;
686 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
688 error ("can%'t mix operands of decimal float and complex types");
689 return error_mark_node;
691 if (code1 == REAL_TYPE && code2 == REAL_TYPE)
693 error ("can%'t mix operands of decimal float and other float types");
694 return error_mark_node;
698 /* If one type is a vector type, return that type. (How the usual
699 arithmetic conversions apply to the vector types extension is not
700 precisely specified.) */
701 if (code1 == VECTOR_TYPE)
704 if (code2 == VECTOR_TYPE)
707 /* If one type is complex, form the common type of the non-complex
708 components, then make that complex. Use T1 or T2 if it is the
710 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
712 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
713 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
714 tree subtype = c_common_type (subtype1, subtype2);
716 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
718 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
721 return build_complex_type (subtype);
724 /* If only one is real, use it as the result. */
726 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
729 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
732 /* If both are real and either are decimal floating point types, use
733 the decimal floating point type with the greater precision. */
735 if (code1 == REAL_TYPE && code2 == REAL_TYPE)
737 if (TYPE_MAIN_VARIANT (t1) == dfloat128_type_node
738 || TYPE_MAIN_VARIANT (t2) == dfloat128_type_node)
739 return dfloat128_type_node;
740 else if (TYPE_MAIN_VARIANT (t1) == dfloat64_type_node
741 || TYPE_MAIN_VARIANT (t2) == dfloat64_type_node)
742 return dfloat64_type_node;
743 else if (TYPE_MAIN_VARIANT (t1) == dfloat32_type_node
744 || TYPE_MAIN_VARIANT (t2) == dfloat32_type_node)
745 return dfloat32_type_node;
748 /* Deal with fixed-point types. */
749 if (code1 == FIXED_POINT_TYPE || code2 == FIXED_POINT_TYPE)
751 unsigned int unsignedp = 0, satp = 0;
752 enum machine_mode m1, m2;
753 unsigned int fbit1, ibit1, fbit2, ibit2, max_fbit, max_ibit;
758 /* If one input type is saturating, the result type is saturating. */
759 if (TYPE_SATURATING (t1) || TYPE_SATURATING (t2))
762 /* If both fixed-point types are unsigned, the result type is unsigned.
763 When mixing fixed-point and integer types, follow the sign of the
765 Otherwise, the result type is signed. */
766 if ((TYPE_UNSIGNED (t1) && TYPE_UNSIGNED (t2)
767 && code1 == FIXED_POINT_TYPE && code2 == FIXED_POINT_TYPE)
768 || (code1 == FIXED_POINT_TYPE && code2 != FIXED_POINT_TYPE
769 && TYPE_UNSIGNED (t1))
770 || (code1 != FIXED_POINT_TYPE && code2 == FIXED_POINT_TYPE
771 && TYPE_UNSIGNED (t2)))
774 /* The result type is signed. */
777 /* If the input type is unsigned, we need to convert to the
779 if (code1 == FIXED_POINT_TYPE && TYPE_UNSIGNED (t1))
781 enum mode_class mclass = (enum mode_class) 0;
782 if (GET_MODE_CLASS (m1) == MODE_UFRACT)
784 else if (GET_MODE_CLASS (m1) == MODE_UACCUM)
788 m1 = mode_for_size (GET_MODE_PRECISION (m1), mclass, 0);
790 if (code2 == FIXED_POINT_TYPE && TYPE_UNSIGNED (t2))
792 enum mode_class mclass = (enum mode_class) 0;
793 if (GET_MODE_CLASS (m2) == MODE_UFRACT)
795 else if (GET_MODE_CLASS (m2) == MODE_UACCUM)
799 m2 = mode_for_size (GET_MODE_PRECISION (m2), mclass, 0);
803 if (code1 == FIXED_POINT_TYPE)
805 fbit1 = GET_MODE_FBIT (m1);
806 ibit1 = GET_MODE_IBIT (m1);
811 /* Signed integers need to subtract one sign bit. */
812 ibit1 = TYPE_PRECISION (t1) - (!TYPE_UNSIGNED (t1));
815 if (code2 == FIXED_POINT_TYPE)
817 fbit2 = GET_MODE_FBIT (m2);
818 ibit2 = GET_MODE_IBIT (m2);
823 /* Signed integers need to subtract one sign bit. */
824 ibit2 = TYPE_PRECISION (t2) - (!TYPE_UNSIGNED (t2));
827 max_ibit = ibit1 >= ibit2 ? ibit1 : ibit2;
828 max_fbit = fbit1 >= fbit2 ? fbit1 : fbit2;
829 return c_common_fixed_point_type_for_size (max_ibit, max_fbit, unsignedp,
833 /* Both real or both integers; use the one with greater precision. */
835 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
837 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
840 /* Same precision. Prefer long longs to longs to ints when the
841 same precision, following the C99 rules on integer type rank
842 (which are equivalent to the C90 rules for C90 types). */
844 if (TYPE_MAIN_VARIANT (t1) == long_long_unsigned_type_node
845 || TYPE_MAIN_VARIANT (t2) == long_long_unsigned_type_node)
846 return long_long_unsigned_type_node;
848 if (TYPE_MAIN_VARIANT (t1) == long_long_integer_type_node
849 || TYPE_MAIN_VARIANT (t2) == long_long_integer_type_node)
851 if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
852 return long_long_unsigned_type_node;
854 return long_long_integer_type_node;
857 if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
858 || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
859 return long_unsigned_type_node;
861 if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
862 || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
864 /* But preserve unsignedness from the other type,
865 since long cannot hold all the values of an unsigned int. */
866 if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2))
867 return long_unsigned_type_node;
869 return long_integer_type_node;
872 /* Likewise, prefer long double to double even if same size. */
873 if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
874 || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
875 return long_double_type_node;
877 /* Otherwise prefer the unsigned one. */
879 if (TYPE_UNSIGNED (t1))
885 /* Wrapper around c_common_type that is used by c-common.c and other
886 front end optimizations that remove promotions. ENUMERAL_TYPEs
887 are allowed here and are converted to their compatible integer types.
888 BOOLEAN_TYPEs are allowed here and return either boolean_type_node or
889 preferably a non-Boolean type as the common type. */
891 common_type (tree t1, tree t2)
893 if (TREE_CODE (t1) == ENUMERAL_TYPE)
894 t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1);
895 if (TREE_CODE (t2) == ENUMERAL_TYPE)
896 t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1);
898 /* If both types are BOOLEAN_TYPE, then return boolean_type_node. */
899 if (TREE_CODE (t1) == BOOLEAN_TYPE
900 && TREE_CODE (t2) == BOOLEAN_TYPE)
901 return boolean_type_node;
903 /* If either type is BOOLEAN_TYPE, then return the other. */
904 if (TREE_CODE (t1) == BOOLEAN_TYPE)
906 if (TREE_CODE (t2) == BOOLEAN_TYPE)
909 return c_common_type (t1, t2);
912 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
913 or various other operations. Return 2 if they are compatible
914 but a warning may be needed if you use them together. */
917 comptypes (tree type1, tree type2)
919 const struct tagged_tu_seen_cache * tagged_tu_seen_base1 = tagged_tu_seen_base;
922 val = comptypes_internal (type1, type2);
923 free_all_tagged_tu_seen_up_to (tagged_tu_seen_base1);
928 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
929 or various other operations. Return 2 if they are compatible
930 but a warning may be needed if you use them together. This
931 differs from comptypes, in that we don't free the seen types. */
934 comptypes_internal (const_tree type1, const_tree type2)
936 const_tree t1 = type1;
937 const_tree t2 = type2;
940 /* Suppress errors caused by previously reported errors. */
942 if (t1 == t2 || !t1 || !t2
943 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK)
946 /* If either type is the internal version of sizetype, return the
948 if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1)
949 && TYPE_ORIG_SIZE_TYPE (t1))
950 t1 = TYPE_ORIG_SIZE_TYPE (t1);
952 if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2)
953 && TYPE_ORIG_SIZE_TYPE (t2))
954 t2 = TYPE_ORIG_SIZE_TYPE (t2);
957 /* Enumerated types are compatible with integer types, but this is
958 not transitive: two enumerated types in the same translation unit
959 are compatible with each other only if they are the same type. */
961 if (TREE_CODE (t1) == ENUMERAL_TYPE && TREE_CODE (t2) != ENUMERAL_TYPE)
962 t1 = c_common_type_for_size (TYPE_PRECISION (t1), TYPE_UNSIGNED (t1));
963 else if (TREE_CODE (t2) == ENUMERAL_TYPE && TREE_CODE (t1) != ENUMERAL_TYPE)
964 t2 = c_common_type_for_size (TYPE_PRECISION (t2), TYPE_UNSIGNED (t2));
969 /* Different classes of types can't be compatible. */
971 if (TREE_CODE (t1) != TREE_CODE (t2))
974 /* Qualifiers must match. C99 6.7.3p9 */
976 if (TYPE_QUALS (t1) != TYPE_QUALS (t2))
979 /* Allow for two different type nodes which have essentially the same
980 definition. Note that we already checked for equality of the type
981 qualifiers (just above). */
983 if (TREE_CODE (t1) != ARRAY_TYPE
984 && TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
987 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
988 if (!(attrval = targetm.comp_type_attributes (t1, t2)))
991 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
994 switch (TREE_CODE (t1))
997 /* Do not remove mode or aliasing information. */
998 if (TYPE_MODE (t1) != TYPE_MODE (t2)
999 || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2))
1001 val = (TREE_TYPE (t1) == TREE_TYPE (t2)
1002 ? 1 : comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2)));
1006 val = function_types_compatible_p (t1, t2);
1011 tree d1 = TYPE_DOMAIN (t1);
1012 tree d2 = TYPE_DOMAIN (t2);
1013 bool d1_variable, d2_variable;
1014 bool d1_zero, d2_zero;
1017 /* Target types must match incl. qualifiers. */
1018 if (TREE_TYPE (t1) != TREE_TYPE (t2)
1019 && 0 == (val = comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2))))
1022 /* Sizes must match unless one is missing or variable. */
1023 if (d1 == 0 || d2 == 0 || d1 == d2)
1026 d1_zero = !TYPE_MAX_VALUE (d1);
1027 d2_zero = !TYPE_MAX_VALUE (d2);
1029 d1_variable = (!d1_zero
1030 && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
1031 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST));
1032 d2_variable = (!d2_zero
1033 && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
1034 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST));
1035 d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1));
1036 d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2));
1038 if (d1_variable || d2_variable)
1040 if (d1_zero && d2_zero)
1042 if (d1_zero || d2_zero
1043 || !tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2))
1044 || !tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2)))
1053 if (val != 1 && !same_translation_unit_p (t1, t2))
1055 tree a1 = TYPE_ATTRIBUTES (t1);
1056 tree a2 = TYPE_ATTRIBUTES (t2);
1058 if (! attribute_list_contained (a1, a2)
1059 && ! attribute_list_contained (a2, a1))
1063 return tagged_types_tu_compatible_p (t1, t2);
1064 val = tagged_types_tu_compatible_p (t1, t2);
1069 val = TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2)
1070 && comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2));
1076 return attrval == 2 && val == 1 ? 2 : val;
1079 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
1080 ignoring their qualifiers. */
1083 comp_target_types (tree ttl, tree ttr)
1088 /* Do not lose qualifiers on element types of array types that are
1089 pointer targets by taking their TYPE_MAIN_VARIANT. */
1090 mvl = TREE_TYPE (ttl);
1091 mvr = TREE_TYPE (ttr);
1092 if (TREE_CODE (mvl) != ARRAY_TYPE)
1093 mvl = TYPE_MAIN_VARIANT (mvl);
1094 if (TREE_CODE (mvr) != ARRAY_TYPE)
1095 mvr = TYPE_MAIN_VARIANT (mvr);
1096 val = comptypes (mvl, mvr);
1099 pedwarn (input_location, OPT_pedantic, "types are not quite compatible");
1103 /* Subroutines of `comptypes'. */
1105 /* Determine whether two trees derive from the same translation unit.
1106 If the CONTEXT chain ends in a null, that tree's context is still
1107 being parsed, so if two trees have context chains ending in null,
1108 they're in the same translation unit. */
1110 same_translation_unit_p (const_tree t1, const_tree t2)
1112 while (t1 && TREE_CODE (t1) != TRANSLATION_UNIT_DECL)
1113 switch (TREE_CODE_CLASS (TREE_CODE (t1)))
1115 case tcc_declaration:
1116 t1 = DECL_CONTEXT (t1); break;
1118 t1 = TYPE_CONTEXT (t1); break;
1119 case tcc_exceptional:
1120 t1 = BLOCK_SUPERCONTEXT (t1); break; /* assume block */
1121 default: gcc_unreachable ();
1124 while (t2 && TREE_CODE (t2) != TRANSLATION_UNIT_DECL)
1125 switch (TREE_CODE_CLASS (TREE_CODE (t2)))
1127 case tcc_declaration:
1128 t2 = DECL_CONTEXT (t2); break;
1130 t2 = TYPE_CONTEXT (t2); break;
1131 case tcc_exceptional:
1132 t2 = BLOCK_SUPERCONTEXT (t2); break; /* assume block */
1133 default: gcc_unreachable ();
1139 /* Allocate the seen two types, assuming that they are compatible. */
1141 static struct tagged_tu_seen_cache *
1142 alloc_tagged_tu_seen_cache (const_tree t1, const_tree t2)
1144 struct tagged_tu_seen_cache *tu = XNEW (struct tagged_tu_seen_cache);
1145 tu->next = tagged_tu_seen_base;
1149 tagged_tu_seen_base = tu;
1151 /* The C standard says that two structures in different translation
1152 units are compatible with each other only if the types of their
1153 fields are compatible (among other things). We assume that they
1154 are compatible until proven otherwise when building the cache.
1155 An example where this can occur is:
1160 If we are comparing this against a similar struct in another TU,
1161 and did not assume they were compatible, we end up with an infinite
1167 /* Free the seen types until we get to TU_TIL. */
1170 free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *tu_til)
1172 const struct tagged_tu_seen_cache *tu = tagged_tu_seen_base;
1173 while (tu != tu_til)
1175 const struct tagged_tu_seen_cache *const tu1
1176 = (const struct tagged_tu_seen_cache *) tu;
1178 free (CONST_CAST (struct tagged_tu_seen_cache *, tu1));
1180 tagged_tu_seen_base = tu_til;
1183 /* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are
1184 compatible. If the two types are not the same (which has been
1185 checked earlier), this can only happen when multiple translation
1186 units are being compiled. See C99 6.2.7 paragraph 1 for the exact
1190 tagged_types_tu_compatible_p (const_tree t1, const_tree t2)
1193 bool needs_warning = false;
1195 /* We have to verify that the tags of the types are the same. This
1196 is harder than it looks because this may be a typedef, so we have
1197 to go look at the original type. It may even be a typedef of a
1199 In the case of compiler-created builtin structs the TYPE_DECL
1200 may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */
1201 while (TYPE_NAME (t1)
1202 && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL
1203 && DECL_ORIGINAL_TYPE (TYPE_NAME (t1)))
1204 t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1));
1206 while (TYPE_NAME (t2)
1207 && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL
1208 && DECL_ORIGINAL_TYPE (TYPE_NAME (t2)))
1209 t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2));
1211 /* C90 didn't have the requirement that the two tags be the same. */
1212 if (flag_isoc99 && TYPE_NAME (t1) != TYPE_NAME (t2))
1215 /* C90 didn't say what happened if one or both of the types were
1216 incomplete; we choose to follow C99 rules here, which is that they
1218 if (TYPE_SIZE (t1) == NULL
1219 || TYPE_SIZE (t2) == NULL)
1223 const struct tagged_tu_seen_cache * tts_i;
1224 for (tts_i = tagged_tu_seen_base; tts_i != NULL; tts_i = tts_i->next)
1225 if (tts_i->t1 == t1 && tts_i->t2 == t2)
1229 switch (TREE_CODE (t1))
1233 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1234 /* Speed up the case where the type values are in the same order. */
1235 tree tv1 = TYPE_VALUES (t1);
1236 tree tv2 = TYPE_VALUES (t2);
1243 for (;tv1 && tv2; tv1 = TREE_CHAIN (tv1), tv2 = TREE_CHAIN (tv2))
1245 if (TREE_PURPOSE (tv1) != TREE_PURPOSE (tv2))
1247 if (simple_cst_equal (TREE_VALUE (tv1), TREE_VALUE (tv2)) != 1)
1254 if (tv1 == NULL_TREE && tv2 == NULL_TREE)
1258 if (tv1 == NULL_TREE || tv2 == NULL_TREE)
1264 if (list_length (TYPE_VALUES (t1)) != list_length (TYPE_VALUES (t2)))
1270 for (s1 = TYPE_VALUES (t1); s1; s1 = TREE_CHAIN (s1))
1272 s2 = purpose_member (TREE_PURPOSE (s1), TYPE_VALUES (t2));
1274 || simple_cst_equal (TREE_VALUE (s1), TREE_VALUE (s2)) != 1)
1285 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1286 if (list_length (TYPE_FIELDS (t1)) != list_length (TYPE_FIELDS (t2)))
1292 /* Speed up the common case where the fields are in the same order. */
1293 for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2); s1 && s2;
1294 s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2))
1298 if (DECL_NAME (s1) != DECL_NAME (s2))
1300 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1302 if (result != 1 && !DECL_NAME (s1))
1310 needs_warning = true;
1312 if (TREE_CODE (s1) == FIELD_DECL
1313 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1314 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1322 tu->val = needs_warning ? 2 : 1;
1326 for (s1 = TYPE_FIELDS (t1); s1; s1 = TREE_CHAIN (s1))
1330 for (s2 = TYPE_FIELDS (t2); s2; s2 = TREE_CHAIN (s2))
1331 if (DECL_NAME (s1) == DECL_NAME (s2))
1335 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1337 if (result != 1 && !DECL_NAME (s1))
1345 needs_warning = true;
1347 if (TREE_CODE (s1) == FIELD_DECL
1348 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1349 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1361 tu->val = needs_warning ? 2 : 10;
1367 struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2);
1369 for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2);
1371 s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2))
1374 if (TREE_CODE (s1) != TREE_CODE (s2)
1375 || DECL_NAME (s1) != DECL_NAME (s2))
1377 result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2));
1381 needs_warning = true;
1383 if (TREE_CODE (s1) == FIELD_DECL
1384 && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1),
1385 DECL_FIELD_BIT_OFFSET (s2)) != 1)
1391 tu->val = needs_warning ? 2 : 1;
1400 /* Return 1 if two function types F1 and F2 are compatible.
1401 If either type specifies no argument types,
1402 the other must specify a fixed number of self-promoting arg types.
1403 Otherwise, if one type specifies only the number of arguments,
1404 the other must specify that number of self-promoting arg types.
1405 Otherwise, the argument types must match. */
1408 function_types_compatible_p (const_tree f1, const_tree f2)
1411 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1416 ret1 = TREE_TYPE (f1);
1417 ret2 = TREE_TYPE (f2);
1419 /* 'volatile' qualifiers on a function's return type used to mean
1420 the function is noreturn. */
1421 if (TYPE_VOLATILE (ret1) != TYPE_VOLATILE (ret2))
1422 pedwarn (input_location, 0, "function return types not compatible due to %<volatile%>");
1423 if (TYPE_VOLATILE (ret1))
1424 ret1 = build_qualified_type (TYPE_MAIN_VARIANT (ret1),
1425 TYPE_QUALS (ret1) & ~TYPE_QUAL_VOLATILE);
1426 if (TYPE_VOLATILE (ret2))
1427 ret2 = build_qualified_type (TYPE_MAIN_VARIANT (ret2),
1428 TYPE_QUALS (ret2) & ~TYPE_QUAL_VOLATILE);
1429 val = comptypes_internal (ret1, ret2);
1433 args1 = TYPE_ARG_TYPES (f1);
1434 args2 = TYPE_ARG_TYPES (f2);
1436 /* An unspecified parmlist matches any specified parmlist
1437 whose argument types don't need default promotions. */
1441 if (!self_promoting_args_p (args2))
1443 /* If one of these types comes from a non-prototype fn definition,
1444 compare that with the other type's arglist.
1445 If they don't match, ask for a warning (but no error). */
1446 if (TYPE_ACTUAL_ARG_TYPES (f1)
1447 && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1)))
1453 if (!self_promoting_args_p (args1))
1455 if (TYPE_ACTUAL_ARG_TYPES (f2)
1456 && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2)))
1461 /* Both types have argument lists: compare them and propagate results. */
1462 val1 = type_lists_compatible_p (args1, args2);
1463 return val1 != 1 ? val1 : val;
1466 /* Check two lists of types for compatibility,
1467 returning 0 for incompatible, 1 for compatible,
1468 or 2 for compatible with warning. */
1471 type_lists_compatible_p (const_tree args1, const_tree args2)
1473 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
1479 tree a1, mv1, a2, mv2;
1480 if (args1 == 0 && args2 == 0)
1482 /* If one list is shorter than the other,
1483 they fail to match. */
1484 if (args1 == 0 || args2 == 0)
1486 mv1 = a1 = TREE_VALUE (args1);
1487 mv2 = a2 = TREE_VALUE (args2);
1488 if (mv1 && mv1 != error_mark_node && TREE_CODE (mv1) != ARRAY_TYPE)
1489 mv1 = TYPE_MAIN_VARIANT (mv1);
1490 if (mv2 && mv2 != error_mark_node && TREE_CODE (mv2) != ARRAY_TYPE)
1491 mv2 = TYPE_MAIN_VARIANT (mv2);
1492 /* A null pointer instead of a type
1493 means there is supposed to be an argument
1494 but nothing is specified about what type it has.
1495 So match anything that self-promotes. */
1498 if (c_type_promotes_to (a2) != a2)
1503 if (c_type_promotes_to (a1) != a1)
1506 /* If one of the lists has an error marker, ignore this arg. */
1507 else if (TREE_CODE (a1) == ERROR_MARK
1508 || TREE_CODE (a2) == ERROR_MARK)
1510 else if (!(newval = comptypes_internal (mv1, mv2)))
1512 /* Allow wait (union {union wait *u; int *i} *)
1513 and wait (union wait *) to be compatible. */
1514 if (TREE_CODE (a1) == UNION_TYPE
1515 && (TYPE_NAME (a1) == 0
1516 || TYPE_TRANSPARENT_UNION (a1))
1517 && TREE_CODE (TYPE_SIZE (a1)) == INTEGER_CST
1518 && tree_int_cst_equal (TYPE_SIZE (a1),
1522 for (memb = TYPE_FIELDS (a1);
1523 memb; memb = TREE_CHAIN (memb))
1525 tree mv3 = TREE_TYPE (memb);
1526 if (mv3 && mv3 != error_mark_node
1527 && TREE_CODE (mv3) != ARRAY_TYPE)
1528 mv3 = TYPE_MAIN_VARIANT (mv3);
1529 if (comptypes_internal (mv3, mv2))
1535 else if (TREE_CODE (a2) == UNION_TYPE
1536 && (TYPE_NAME (a2) == 0
1537 || TYPE_TRANSPARENT_UNION (a2))
1538 && TREE_CODE (TYPE_SIZE (a2)) == INTEGER_CST
1539 && tree_int_cst_equal (TYPE_SIZE (a2),
1543 for (memb = TYPE_FIELDS (a2);
1544 memb; memb = TREE_CHAIN (memb))
1546 tree mv3 = TREE_TYPE (memb);
1547 if (mv3 && mv3 != error_mark_node
1548 && TREE_CODE (mv3) != ARRAY_TYPE)
1549 mv3 = TYPE_MAIN_VARIANT (mv3);
1550 if (comptypes_internal (mv3, mv1))
1560 /* comptypes said ok, but record if it said to warn. */
1564 args1 = TREE_CHAIN (args1);
1565 args2 = TREE_CHAIN (args2);
1569 /* Compute the size to increment a pointer by. */
1572 c_size_in_bytes (const_tree type)
1574 enum tree_code code = TREE_CODE (type);
1576 if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK)
1577 return size_one_node;
1579 if (!COMPLETE_OR_VOID_TYPE_P (type))
1581 error ("arithmetic on pointer to an incomplete type");
1582 return size_one_node;
1585 /* Convert in case a char is more than one unit. */
1586 return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
1587 size_int (TYPE_PRECISION (char_type_node)
1591 /* Return either DECL or its known constant value (if it has one). */
1594 decl_constant_value (tree decl)
1596 if (/* Don't change a variable array bound or initial value to a constant
1597 in a place where a variable is invalid. Note that DECL_INITIAL
1598 isn't valid for a PARM_DECL. */
1599 current_function_decl != 0
1600 && TREE_CODE (decl) != PARM_DECL
1601 && !TREE_THIS_VOLATILE (decl)
1602 && TREE_READONLY (decl)
1603 && DECL_INITIAL (decl) != 0
1604 && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK
1605 /* This is invalid if initial value is not constant.
1606 If it has either a function call, a memory reference,
1607 or a variable, then re-evaluating it could give different results. */
1608 && TREE_CONSTANT (DECL_INITIAL (decl))
1609 /* Check for cases where this is sub-optimal, even though valid. */
1610 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR)
1611 return DECL_INITIAL (decl);
1615 /* Convert the array expression EXP to a pointer. */
1617 array_to_pointer_conversion (tree exp)
1619 tree orig_exp = exp;
1620 tree type = TREE_TYPE (exp);
1622 tree restype = TREE_TYPE (type);
1625 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
1627 STRIP_TYPE_NOPS (exp);
1629 if (TREE_NO_WARNING (orig_exp))
1630 TREE_NO_WARNING (exp) = 1;
1632 ptrtype = build_pointer_type (restype);
1634 if (TREE_CODE (exp) == INDIRECT_REF)
1635 return convert (ptrtype, TREE_OPERAND (exp, 0));
1637 adr = build_unary_op (EXPR_LOCATION (exp), ADDR_EXPR, exp, 1);
1638 return convert (ptrtype, adr);
1641 /* Convert the function expression EXP to a pointer. */
1643 function_to_pointer_conversion (tree exp)
1645 tree orig_exp = exp;
1647 gcc_assert (TREE_CODE (TREE_TYPE (exp)) == FUNCTION_TYPE);
1649 STRIP_TYPE_NOPS (exp);
1651 if (TREE_NO_WARNING (orig_exp))
1652 TREE_NO_WARNING (exp) = 1;
1654 return build_unary_op (EXPR_LOCATION (exp), ADDR_EXPR, exp, 0);
1657 /* Perform the default conversion of arrays and functions to pointers.
1658 Return the result of converting EXP. For any other expression, just
1662 default_function_array_conversion (struct c_expr exp)
1664 tree orig_exp = exp.value;
1665 tree type = TREE_TYPE (exp.value);
1666 enum tree_code code = TREE_CODE (type);
1672 bool not_lvalue = false;
1673 bool lvalue_array_p;
1675 while ((TREE_CODE (exp.value) == NON_LVALUE_EXPR
1676 || CONVERT_EXPR_P (exp.value))
1677 && TREE_TYPE (TREE_OPERAND (exp.value, 0)) == type)
1679 if (TREE_CODE (exp.value) == NON_LVALUE_EXPR)
1681 exp.value = TREE_OPERAND (exp.value, 0);
1684 if (TREE_NO_WARNING (orig_exp))
1685 TREE_NO_WARNING (exp.value) = 1;
1687 lvalue_array_p = !not_lvalue && lvalue_p (exp.value);
1688 if (!flag_isoc99 && !lvalue_array_p)
1690 /* Before C99, non-lvalue arrays do not decay to pointers.
1691 Normally, using such an array would be invalid; but it can
1692 be used correctly inside sizeof or as a statement expression.
1693 Thus, do not give an error here; an error will result later. */
1697 exp.value = array_to_pointer_conversion (exp.value);
1701 exp.value = function_to_pointer_conversion (exp.value);
1711 /* EXP is an expression of integer type. Apply the integer promotions
1712 to it and return the promoted value. */
1715 perform_integral_promotions (tree exp)
1717 tree type = TREE_TYPE (exp);
1718 enum tree_code code = TREE_CODE (type);
1720 gcc_assert (INTEGRAL_TYPE_P (type));
1722 /* Normally convert enums to int,
1723 but convert wide enums to something wider. */
1724 if (code == ENUMERAL_TYPE)
1726 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
1727 TYPE_PRECISION (integer_type_node)),
1728 ((TYPE_PRECISION (type)
1729 >= TYPE_PRECISION (integer_type_node))
1730 && TYPE_UNSIGNED (type)));
1732 return convert (type, exp);
1735 /* ??? This should no longer be needed now bit-fields have their
1737 if (TREE_CODE (exp) == COMPONENT_REF
1738 && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1))
1739 /* If it's thinner than an int, promote it like a
1740 c_promoting_integer_type_p, otherwise leave it alone. */
1741 && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)),
1742 TYPE_PRECISION (integer_type_node)))
1743 return convert (integer_type_node, exp);
1745 if (c_promoting_integer_type_p (type))
1747 /* Preserve unsignedness if not really getting any wider. */
1748 if (TYPE_UNSIGNED (type)
1749 && TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
1750 return convert (unsigned_type_node, exp);
1752 return convert (integer_type_node, exp);
1759 /* Perform default promotions for C data used in expressions.
1760 Enumeral types or short or char are converted to int.
1761 In addition, manifest constants symbols are replaced by their values. */
1764 default_conversion (tree exp)
1767 tree type = TREE_TYPE (exp);
1768 enum tree_code code = TREE_CODE (type);
1770 /* Functions and arrays have been converted during parsing. */
1771 gcc_assert (code != FUNCTION_TYPE);
1772 if (code == ARRAY_TYPE)
1775 /* Constants can be used directly unless they're not loadable. */
1776 if (TREE_CODE (exp) == CONST_DECL)
1777 exp = DECL_INITIAL (exp);
1779 /* Strip no-op conversions. */
1781 STRIP_TYPE_NOPS (exp);
1783 if (TREE_NO_WARNING (orig_exp))
1784 TREE_NO_WARNING (exp) = 1;
1786 if (code == VOID_TYPE)
1788 error ("void value not ignored as it ought to be");
1789 return error_mark_node;
1792 exp = require_complete_type (exp);
1793 if (exp == error_mark_node)
1794 return error_mark_node;
1796 if (INTEGRAL_TYPE_P (type))
1797 return perform_integral_promotions (exp);
1802 /* Look up COMPONENT in a structure or union DECL.
1804 If the component name is not found, returns NULL_TREE. Otherwise,
1805 the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL
1806 stepping down the chain to the component, which is in the last
1807 TREE_VALUE of the list. Normally the list is of length one, but if
1808 the component is embedded within (nested) anonymous structures or
1809 unions, the list steps down the chain to the component. */
1812 lookup_field (tree decl, tree component)
1814 tree type = TREE_TYPE (decl);
1817 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1818 to the field elements. Use a binary search on this array to quickly
1819 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1820 will always be set for structures which have many elements. */
1822 if (TYPE_LANG_SPECIFIC (type) && TYPE_LANG_SPECIFIC (type)->s)
1825 tree *field_array = &TYPE_LANG_SPECIFIC (type)->s->elts[0];
1827 field = TYPE_FIELDS (type);
1829 top = TYPE_LANG_SPECIFIC (type)->s->len;
1830 while (top - bot > 1)
1832 half = (top - bot + 1) >> 1;
1833 field = field_array[bot+half];
1835 if (DECL_NAME (field) == NULL_TREE)
1837 /* Step through all anon unions in linear fashion. */
1838 while (DECL_NAME (field_array[bot]) == NULL_TREE)
1840 field = field_array[bot++];
1841 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1842 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1844 tree anon = lookup_field (field, component);
1847 return tree_cons (NULL_TREE, field, anon);
1851 /* Entire record is only anon unions. */
1855 /* Restart the binary search, with new lower bound. */
1859 if (DECL_NAME (field) == component)
1861 if (DECL_NAME (field) < component)
1867 if (DECL_NAME (field_array[bot]) == component)
1868 field = field_array[bot];
1869 else if (DECL_NAME (field) != component)
1874 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1876 if (DECL_NAME (field) == NULL_TREE
1877 && (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1878 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE))
1880 tree anon = lookup_field (field, component);
1883 return tree_cons (NULL_TREE, field, anon);
1886 if (DECL_NAME (field) == component)
1890 if (field == NULL_TREE)
1894 return tree_cons (NULL_TREE, field, NULL_TREE);
1897 /* Make an expression to refer to the COMPONENT field of
1898 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1901 build_component_ref (tree datum, tree component)
1903 tree type = TREE_TYPE (datum);
1904 enum tree_code code = TREE_CODE (type);
1907 bool datum_lvalue = lvalue_p (datum);
1909 if (!objc_is_public (datum, component))
1910 return error_mark_node;
1912 /* See if there is a field or component with name COMPONENT. */
1914 if (code == RECORD_TYPE || code == UNION_TYPE)
1916 if (!COMPLETE_TYPE_P (type))
1918 c_incomplete_type_error (NULL_TREE, type);
1919 return error_mark_node;
1922 field = lookup_field (datum, component);
1926 error ("%qT has no member named %qE", type, component);
1927 return error_mark_node;
1930 /* Chain the COMPONENT_REFs if necessary down to the FIELD.
1931 This might be better solved in future the way the C++ front
1932 end does it - by giving the anonymous entities each a
1933 separate name and type, and then have build_component_ref
1934 recursively call itself. We can't do that here. */
1937 tree subdatum = TREE_VALUE (field);
1940 bool use_datum_quals;
1942 if (TREE_TYPE (subdatum) == error_mark_node)
1943 return error_mark_node;
1945 /* If this is an rvalue, it does not have qualifiers in C
1946 standard terms and we must avoid propagating such
1947 qualifiers down to a non-lvalue array that is then
1948 converted to a pointer. */
1949 use_datum_quals = (datum_lvalue
1950 || TREE_CODE (TREE_TYPE (subdatum)) != ARRAY_TYPE);
1952 quals = TYPE_QUALS (strip_array_types (TREE_TYPE (subdatum)));
1953 if (use_datum_quals)
1954 quals |= TYPE_QUALS (TREE_TYPE (datum));
1955 subtype = c_build_qualified_type (TREE_TYPE (subdatum), quals);
1957 ref = build3 (COMPONENT_REF, subtype, datum, subdatum,
1959 if (TREE_READONLY (subdatum)
1960 || (use_datum_quals && TREE_READONLY (datum)))
1961 TREE_READONLY (ref) = 1;
1962 if (TREE_THIS_VOLATILE (subdatum)
1963 || (use_datum_quals && TREE_THIS_VOLATILE (datum)))
1964 TREE_THIS_VOLATILE (ref) = 1;
1966 if (TREE_DEPRECATED (subdatum))
1967 warn_deprecated_use (subdatum, NULL_TREE);
1971 field = TREE_CHAIN (field);
1977 else if (code != ERROR_MARK)
1978 error ("request for member %qE in something not a structure or union",
1981 return error_mark_node;
1984 /* Given an expression PTR for a pointer, return an expression
1985 for the value pointed to.
1986 ERRORSTRING is the name of the operator to appear in error messages.
1988 LOC is the location to use for the generated tree. */
1991 build_indirect_ref (location_t loc, tree ptr, const char *errorstring)
1993 tree pointer = default_conversion (ptr);
1994 tree type = TREE_TYPE (pointer);
1997 if (TREE_CODE (type) == POINTER_TYPE)
1999 if (CONVERT_EXPR_P (pointer)
2000 || TREE_CODE (pointer) == VIEW_CONVERT_EXPR)
2002 /* If a warning is issued, mark it to avoid duplicates from
2003 the backend. This only needs to be done at
2004 warn_strict_aliasing > 2. */
2005 if (warn_strict_aliasing > 2)
2006 if (strict_aliasing_warning (TREE_TYPE (TREE_OPERAND (pointer, 0)),
2007 type, TREE_OPERAND (pointer, 0)))
2008 TREE_NO_WARNING (pointer) = 1;
2011 if (TREE_CODE (pointer) == ADDR_EXPR
2012 && (TREE_TYPE (TREE_OPERAND (pointer, 0))
2013 == TREE_TYPE (type)))
2015 ref = TREE_OPERAND (pointer, 0);
2016 protected_set_expr_location (ref, loc);
2021 tree t = TREE_TYPE (type);
2023 ref = build1 (INDIRECT_REF, t, pointer);
2025 if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE)
2027 error_at (loc, "dereferencing pointer to incomplete type");
2028 return error_mark_node;
2030 if (VOID_TYPE_P (t) && skip_evaluation == 0)
2031 warning_at (loc, 0, "dereferencing %<void *%> pointer");
2033 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
2034 so that we get the proper error message if the result is used
2035 to assign to. Also, &* is supposed to be a no-op.
2036 And ANSI C seems to specify that the type of the result
2037 should be the const type. */
2038 /* A de-reference of a pointer to const is not a const. It is valid
2039 to change it via some other pointer. */
2040 TREE_READONLY (ref) = TYPE_READONLY (t);
2041 TREE_SIDE_EFFECTS (ref)
2042 = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer);
2043 TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
2044 protected_set_expr_location (ref, loc);
2048 else if (TREE_CODE (pointer) != ERROR_MARK)
2050 "invalid type argument of %qs (have %qT)", errorstring, type);
2051 return error_mark_node;
2054 /* This handles expressions of the form "a[i]", which denotes
2057 This is logically equivalent in C to *(a+i), but we may do it differently.
2058 If A is a variable or a member, we generate a primitive ARRAY_REF.
2059 This avoids forcing the array out of registers, and can work on
2060 arrays that are not lvalues (for example, members of structures returned
2063 LOC is the location to use for the returned expression. */
2066 build_array_ref (tree array, tree index, location_t loc)
2069 bool swapped = false;
2070 if (TREE_TYPE (array) == error_mark_node
2071 || TREE_TYPE (index) == error_mark_node)
2072 return error_mark_node;
2074 if (TREE_CODE (TREE_TYPE (array)) != ARRAY_TYPE
2075 && TREE_CODE (TREE_TYPE (array)) != POINTER_TYPE)
2078 if (TREE_CODE (TREE_TYPE (index)) != ARRAY_TYPE
2079 && TREE_CODE (TREE_TYPE (index)) != POINTER_TYPE)
2081 error_at (loc, "subscripted value is neither array nor pointer");
2082 return error_mark_node;
2090 if (!INTEGRAL_TYPE_P (TREE_TYPE (index)))
2092 error_at (loc, "array subscript is not an integer");
2093 return error_mark_node;
2096 if (TREE_CODE (TREE_TYPE (TREE_TYPE (array))) == FUNCTION_TYPE)
2098 error_at (loc, "subscripted value is pointer to function");
2099 return error_mark_node;
2102 /* ??? Existing practice has been to warn only when the char
2103 index is syntactically the index, not for char[array]. */
2105 warn_array_subscript_with_type_char (index);
2107 /* Apply default promotions *after* noticing character types. */
2108 index = default_conversion (index);
2110 gcc_assert (TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE);
2112 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE)
2116 /* An array that is indexed by a non-constant
2117 cannot be stored in a register; we must be able to do
2118 address arithmetic on its address.
2119 Likewise an array of elements of variable size. */
2120 if (TREE_CODE (index) != INTEGER_CST
2121 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array)))
2122 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST))
2124 if (!c_mark_addressable (array))
2125 return error_mark_node;
2127 /* An array that is indexed by a constant value which is not within
2128 the array bounds cannot be stored in a register either; because we
2129 would get a crash in store_bit_field/extract_bit_field when trying
2130 to access a non-existent part of the register. */
2131 if (TREE_CODE (index) == INTEGER_CST
2132 && TYPE_DOMAIN (TREE_TYPE (array))
2133 && !int_fits_type_p (index, TYPE_DOMAIN (TREE_TYPE (array))))
2135 if (!c_mark_addressable (array))
2136 return error_mark_node;
2142 while (TREE_CODE (foo) == COMPONENT_REF)
2143 foo = TREE_OPERAND (foo, 0);
2144 if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo))
2145 pedwarn (loc, OPT_pedantic,
2146 "ISO C forbids subscripting %<register%> array");
2147 else if (!flag_isoc99 && !lvalue_p (foo))
2148 pedwarn (loc, OPT_pedantic,
2149 "ISO C90 forbids subscripting non-lvalue array");
2152 type = TREE_TYPE (TREE_TYPE (array));
2153 rval = build4 (ARRAY_REF, type, array, index, NULL_TREE, NULL_TREE);
2154 /* Array ref is const/volatile if the array elements are
2155 or if the array is. */
2156 TREE_READONLY (rval)
2157 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array)))
2158 | TREE_READONLY (array));
2159 TREE_SIDE_EFFECTS (rval)
2160 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
2161 | TREE_SIDE_EFFECTS (array));
2162 TREE_THIS_VOLATILE (rval)
2163 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
2164 /* This was added by rms on 16 Nov 91.
2165 It fixes vol struct foo *a; a->elts[1]
2166 in an inline function.
2167 Hope it doesn't break something else. */
2168 | TREE_THIS_VOLATILE (array));
2169 ret = require_complete_type (rval);
2170 protected_set_expr_location (ret, loc);
2175 tree ar = default_conversion (array);
2177 if (ar == error_mark_node)
2180 gcc_assert (TREE_CODE (TREE_TYPE (ar)) == POINTER_TYPE);
2181 gcc_assert (TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) != FUNCTION_TYPE);
2183 return build_indirect_ref
2184 (loc, build_binary_op (loc, PLUS_EXPR, ar, index, 0),
2189 /* Build an external reference to identifier ID. FUN indicates
2190 whether this will be used for a function call. LOC is the source
2191 location of the identifier. This sets *TYPE to the type of the
2192 identifier, which is not the same as the type of the returned value
2193 for CONST_DECLs defined as enum constants. If the type of the
2194 identifier is not available, *TYPE is set to NULL. */
2196 build_external_ref (tree id, int fun, location_t loc, tree *type)
2199 tree decl = lookup_name (id);
2201 /* In Objective-C, an instance variable (ivar) may be preferred to
2202 whatever lookup_name() found. */
2203 decl = objc_lookup_ivar (decl, id);
2206 if (decl && decl != error_mark_node)
2209 *type = TREE_TYPE (ref);
2212 /* Implicit function declaration. */
2213 ref = implicitly_declare (id);
2214 else if (decl == error_mark_node)
2215 /* Don't complain about something that's already been
2216 complained about. */
2217 return error_mark_node;
2220 undeclared_variable (id, loc);
2221 return error_mark_node;
2224 if (TREE_TYPE (ref) == error_mark_node)
2225 return error_mark_node;
2227 if (TREE_DEPRECATED (ref))
2228 warn_deprecated_use (ref, NULL_TREE);
2230 /* Recursive call does not count as usage. */
2231 if (ref != current_function_decl)
2233 TREE_USED (ref) = 1;
2236 if (TREE_CODE (ref) == FUNCTION_DECL && !in_alignof)
2238 if (!in_sizeof && !in_typeof)
2239 C_DECL_USED (ref) = 1;
2240 else if (DECL_INITIAL (ref) == 0
2241 && DECL_EXTERNAL (ref)
2242 && !TREE_PUBLIC (ref))
2243 record_maybe_used_decl (ref);
2246 if (TREE_CODE (ref) == CONST_DECL)
2248 used_types_insert (TREE_TYPE (ref));
2251 && TREE_CODE (TREE_TYPE (ref)) == ENUMERAL_TYPE
2252 && C_TYPE_DEFINED_IN_STRUCT (TREE_TYPE (ref)))
2254 warning_at (loc, OPT_Wc___compat,
2255 ("enum constant defined in struct or union "
2256 "is not visible in C++"));
2257 inform (DECL_SOURCE_LOCATION (ref), "enum constant defined here");
2260 ref = DECL_INITIAL (ref);
2261 TREE_CONSTANT (ref) = 1;
2263 else if (current_function_decl != 0
2264 && !DECL_FILE_SCOPE_P (current_function_decl)
2265 && (TREE_CODE (ref) == VAR_DECL
2266 || TREE_CODE (ref) == PARM_DECL
2267 || TREE_CODE (ref) == FUNCTION_DECL))
2269 tree context = decl_function_context (ref);
2271 if (context != 0 && context != current_function_decl)
2272 DECL_NONLOCAL (ref) = 1;
2274 /* C99 6.7.4p3: An inline definition of a function with external
2275 linkage ... shall not contain a reference to an identifier with
2276 internal linkage. */
2277 else if (current_function_decl != 0
2278 && DECL_DECLARED_INLINE_P (current_function_decl)
2279 && DECL_EXTERNAL (current_function_decl)
2280 && VAR_OR_FUNCTION_DECL_P (ref)
2281 && (TREE_CODE (ref) != VAR_DECL || TREE_STATIC (ref))
2282 && ! TREE_PUBLIC (ref)
2283 && DECL_CONTEXT (ref) != current_function_decl)
2284 record_inline_static (loc, current_function_decl, ref,
2290 /* Record details of decls possibly used inside sizeof or typeof. */
2291 struct maybe_used_decl
2295 /* The level seen at (in_sizeof + in_typeof). */
2297 /* The next one at this level or above, or NULL. */
2298 struct maybe_used_decl *next;
2301 static struct maybe_used_decl *maybe_used_decls;
2303 /* Record that DECL, an undefined static function reference seen
2304 inside sizeof or typeof, might be used if the operand of sizeof is
2305 a VLA type or the operand of typeof is a variably modified
2309 record_maybe_used_decl (tree decl)
2311 struct maybe_used_decl *t = XOBNEW (&parser_obstack, struct maybe_used_decl);
2313 t->level = in_sizeof + in_typeof;
2314 t->next = maybe_used_decls;
2315 maybe_used_decls = t;
2318 /* Pop the stack of decls possibly used inside sizeof or typeof. If
2319 USED is false, just discard them. If it is true, mark them used
2320 (if no longer inside sizeof or typeof) or move them to the next
2321 level up (if still inside sizeof or typeof). */
2324 pop_maybe_used (bool used)
2326 struct maybe_used_decl *p = maybe_used_decls;
2327 int cur_level = in_sizeof + in_typeof;
2328 while (p && p->level > cur_level)
2333 C_DECL_USED (p->decl) = 1;
2335 p->level = cur_level;
2339 if (!used || cur_level == 0)
2340 maybe_used_decls = p;
2343 /* Return the result of sizeof applied to EXPR. */
2346 c_expr_sizeof_expr (struct c_expr expr)
2349 if (expr.value == error_mark_node)
2351 ret.value = error_mark_node;
2352 ret.original_code = ERROR_MARK;
2353 ret.original_type = NULL;
2354 pop_maybe_used (false);
2358 bool expr_const_operands = true;
2359 tree folded_expr = c_fully_fold (expr.value, require_constant_value,
2360 &expr_const_operands);
2361 ret.value = c_sizeof (TREE_TYPE (folded_expr));
2362 ret.original_code = ERROR_MARK;
2363 ret.original_type = NULL;
2364 if (c_vla_type_p (TREE_TYPE (folded_expr)))
2366 /* sizeof is evaluated when given a vla (C99 6.5.3.4p2). */
2367 ret.value = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (ret.value),
2368 folded_expr, ret.value);
2369 C_MAYBE_CONST_EXPR_NON_CONST (ret.value) = !expr_const_operands;
2371 pop_maybe_used (C_TYPE_VARIABLE_SIZE (TREE_TYPE (folded_expr)));
2376 /* Return the result of sizeof applied to T, a structure for the type
2377 name passed to sizeof (rather than the type itself). */
2380 c_expr_sizeof_type (struct c_type_name *t)
2384 tree type_expr = NULL_TREE;
2385 bool type_expr_const = true;
2386 type = groktypename (t, &type_expr, &type_expr_const);
2387 ret.value = c_sizeof (type);
2388 ret.original_code = ERROR_MARK;
2389 ret.original_type = NULL;
2390 if ((type_expr || TREE_CODE (ret.value) == INTEGER_CST)
2391 && c_vla_type_p (type))
2393 /* If the type is a [*] array, it is a VLA but is represented as
2394 having a size of zero. In such a case we must ensure that
2395 the result of sizeof does not get folded to a constant by
2396 c_fully_fold, because if the size is evaluated the result is
2397 not constant and so constraints on zero or negative size
2398 arrays must not be applied when this sizeof call is inside
2399 another array declarator. */
2401 type_expr = integer_zero_node;
2402 ret.value = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (ret.value),
2403 type_expr, ret.value);
2404 C_MAYBE_CONST_EXPR_NON_CONST (ret.value) = !type_expr_const;
2406 pop_maybe_used (type != error_mark_node
2407 ? C_TYPE_VARIABLE_SIZE (type) : false);
2411 /* Build a function call to function FUNCTION with parameters PARAMS.
2412 PARAMS is a list--a chain of TREE_LIST nodes--in which the
2413 TREE_VALUE of each node is a parameter-expression.
2414 FUNCTION's data type may be a function type or a pointer-to-function. */
2417 build_function_call (tree function, tree params)
2422 vec = VEC_alloc (tree, gc, list_length (params));
2423 for (; params; params = TREE_CHAIN (params))
2424 VEC_quick_push (tree, vec, TREE_VALUE (params));
2425 ret = build_function_call_vec (function, vec, NULL);
2426 VEC_free (tree, gc, vec);
2430 /* Build a function call to function FUNCTION with parameters PARAMS.
2431 ORIGTYPES, if not NULL, is a vector of types; each element is
2432 either NULL or the original type of the corresponding element in
2433 PARAMS. The original type may differ from TREE_TYPE of the
2434 parameter for enums. FUNCTION's data type may be a function type
2435 or pointer-to-function. This function changes the elements of
2439 build_function_call_vec (tree function, VEC(tree,gc) *params,
2440 VEC(tree,gc) *origtypes)
2442 tree fntype, fundecl = 0;
2443 tree name = NULL_TREE, result;
2449 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
2450 STRIP_TYPE_NOPS (function);
2452 /* Convert anything with function type to a pointer-to-function. */
2453 if (TREE_CODE (function) == FUNCTION_DECL)
2455 /* Implement type-directed function overloading for builtins.
2456 resolve_overloaded_builtin and targetm.resolve_overloaded_builtin
2457 handle all the type checking. The result is a complete expression
2458 that implements this function call. */
2459 tem = resolve_overloaded_builtin (function, params);
2463 name = DECL_NAME (function);
2466 if (TREE_CODE (TREE_TYPE (function)) == FUNCTION_TYPE)
2467 function = function_to_pointer_conversion (function);
2469 /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF
2470 expressions, like those used for ObjC messenger dispatches. */
2471 if (!VEC_empty (tree, params))
2472 function = objc_rewrite_function_call (function,
2473 VEC_index (tree, params, 0));
2475 function = c_fully_fold (function, false, NULL);
2477 fntype = TREE_TYPE (function);
2479 if (TREE_CODE (fntype) == ERROR_MARK)
2480 return error_mark_node;
2482 if (!(TREE_CODE (fntype) == POINTER_TYPE
2483 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE))
2485 error ("called object %qE is not a function", function);
2486 return error_mark_node;
2489 if (fundecl && TREE_THIS_VOLATILE (fundecl))
2490 current_function_returns_abnormally = 1;
2492 /* fntype now gets the type of function pointed to. */
2493 fntype = TREE_TYPE (fntype);
2495 /* Convert the parameters to the types declared in the
2496 function prototype, or apply default promotions. */
2498 nargs = convert_arguments (TYPE_ARG_TYPES (fntype), params, origtypes,
2501 return error_mark_node;
2503 /* Check that the function is called through a compatible prototype.
2504 If it is not, replace the call by a trap, wrapped up in a compound
2505 expression if necessary. This has the nice side-effect to prevent
2506 the tree-inliner from generating invalid assignment trees which may
2507 blow up in the RTL expander later. */
2508 if (CONVERT_EXPR_P (function)
2509 && TREE_CODE (tem = TREE_OPERAND (function, 0)) == ADDR_EXPR
2510 && TREE_CODE (tem = TREE_OPERAND (tem, 0)) == FUNCTION_DECL
2511 && !comptypes (fntype, TREE_TYPE (tem)))
2513 tree return_type = TREE_TYPE (fntype);
2514 tree trap = build_function_call (built_in_decls[BUILT_IN_TRAP],
2518 /* This situation leads to run-time undefined behavior. We can't,
2519 therefore, simply error unless we can prove that all possible
2520 executions of the program must execute the code. */
2521 if (warning (0, "function called through a non-compatible type"))
2522 /* We can, however, treat "undefined" any way we please.
2523 Call abort to encourage the user to fix the program. */
2524 inform (input_location, "if this code is reached, the program will abort");
2525 /* Before the abort, allow the function arguments to exit or
2527 for (i = 0; i < nargs; i++)
2528 trap = build2 (COMPOUND_EXPR, void_type_node,
2529 VEC_index (tree, params, i), trap);
2531 if (VOID_TYPE_P (return_type))
2533 if (TYPE_QUALS (return_type) != TYPE_UNQUALIFIED)
2534 pedwarn (input_location, 0,
2535 "function with qualified void return type called");
2542 if (AGGREGATE_TYPE_P (return_type))
2543 rhs = build_compound_literal (return_type,
2544 build_constructor (return_type, 0),
2547 rhs = fold_convert (return_type, integer_zero_node);
2549 return require_complete_type (build2 (COMPOUND_EXPR, return_type,
2554 argarray = VEC_address (tree, params);
2556 /* Check that arguments to builtin functions match the expectations. */
2558 && DECL_BUILT_IN (fundecl)
2559 && DECL_BUILT_IN_CLASS (fundecl) == BUILT_IN_NORMAL
2560 && !check_builtin_function_arguments (fundecl, nargs, argarray))
2561 return error_mark_node;
2563 /* Check that the arguments to the function are valid. */
2564 check_function_arguments (TYPE_ATTRIBUTES (fntype), nargs, argarray,
2565 TYPE_ARG_TYPES (fntype));
2567 if (name != NULL_TREE
2568 && !strncmp (IDENTIFIER_POINTER (name), "__builtin_", 10))
2570 if (require_constant_value)
2571 result = fold_build_call_array_initializer (TREE_TYPE (fntype),
2572 function, nargs, argarray);
2574 result = fold_build_call_array (TREE_TYPE (fntype),
2575 function, nargs, argarray);
2576 if (TREE_CODE (result) == NOP_EXPR
2577 && TREE_CODE (TREE_OPERAND (result, 0)) == INTEGER_CST)
2578 STRIP_TYPE_NOPS (result);
2581 result = build_call_array (TREE_TYPE (fntype),
2582 function, nargs, argarray);
2584 if (VOID_TYPE_P (TREE_TYPE (result)))
2586 if (TYPE_QUALS (TREE_TYPE (result)) != TYPE_UNQUALIFIED)
2587 pedwarn (input_location, 0,
2588 "function with qualified void return type called");
2591 return require_complete_type (result);
2594 /* Convert the argument expressions in the vector VALUES
2595 to the types in the list TYPELIST.
2597 If TYPELIST is exhausted, or when an element has NULL as its type,
2598 perform the default conversions.
2600 ORIGTYPES is the original types of the expressions in VALUES. This
2601 holds the type of enum values which have been converted to integral
2602 types. It may be NULL.
2604 FUNCTION is a tree for the called function. It is used only for
2605 error messages, where it is formatted with %qE.
2607 This is also where warnings about wrong number of args are generated.
2609 Returns the actual number of arguments processed (which may be less
2610 than the length of VALUES in some error situations), or -1 on
2614 convert_arguments (tree typelist, VEC(tree,gc) *values,
2615 VEC(tree,gc) *origtypes, tree function, tree fundecl)
2618 unsigned int parmnum;
2619 const bool type_generic = fundecl
2620 && lookup_attribute ("type generic", TYPE_ATTRIBUTES(TREE_TYPE (fundecl)));
2621 bool type_generic_remove_excess_precision = false;
2624 /* Change pointer to function to the function itself for
2626 if (TREE_CODE (function) == ADDR_EXPR
2627 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
2628 function = TREE_OPERAND (function, 0);
2630 /* Handle an ObjC selector specially for diagnostics. */
2631 selector = objc_message_selector ();
2633 /* For type-generic built-in functions, determine whether excess
2634 precision should be removed (classification) or not
2637 && DECL_BUILT_IN (fundecl)
2638 && DECL_BUILT_IN_CLASS (fundecl) == BUILT_IN_NORMAL)
2640 switch (DECL_FUNCTION_CODE (fundecl))
2642 case BUILT_IN_ISFINITE:
2643 case BUILT_IN_ISINF:
2644 case BUILT_IN_ISINF_SIGN:
2645 case BUILT_IN_ISNAN:
2646 case BUILT_IN_ISNORMAL:
2647 case BUILT_IN_FPCLASSIFY:
2648 type_generic_remove_excess_precision = true;
2652 type_generic_remove_excess_precision = false;
2657 /* Scan the given expressions and types, producing individual
2658 converted arguments. */
2660 for (typetail = typelist, parmnum = 0;
2661 VEC_iterate (tree, values, parmnum, val);
2664 tree type = typetail ? TREE_VALUE (typetail) : 0;
2665 tree valtype = TREE_TYPE (val);
2666 tree rname = function;
2667 int argnum = parmnum + 1;
2668 const char *invalid_func_diag;
2669 bool excess_precision = false;
2673 if (type == void_type_node)
2675 error ("too many arguments to function %qE", function);
2679 if (selector && argnum > 2)
2685 npc = null_pointer_constant_p (val);
2687 /* If there is excess precision and a prototype, convert once to
2688 the required type rather than converting via the semantic
2689 type. Likewise without a prototype a float value represented
2690 as long double should be converted once to double. But for
2691 type-generic classification functions excess precision must
2693 if (TREE_CODE (val) == EXCESS_PRECISION_EXPR
2694 && (type || !type_generic || !type_generic_remove_excess_precision))
2696 val = TREE_OPERAND (val, 0);
2697 excess_precision = true;
2699 val = c_fully_fold (val, false, NULL);
2700 STRIP_TYPE_NOPS (val);
2702 val = require_complete_type (val);
2706 /* Formal parm type is specified by a function prototype. */
2708 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
2710 error ("type of formal parameter %d is incomplete", parmnum + 1);
2717 /* Optionally warn about conversions that
2718 differ from the default conversions. */
2719 if (warn_traditional_conversion || warn_traditional)
2721 unsigned int formal_prec = TYPE_PRECISION (type);
2723 if (INTEGRAL_TYPE_P (type)
2724 && TREE_CODE (valtype) == REAL_TYPE)
2725 warning (0, "passing argument %d of %qE as integer "
2726 "rather than floating due to prototype",
2728 if (INTEGRAL_TYPE_P (type)
2729 && TREE_CODE (valtype) == COMPLEX_TYPE)
2730 warning (0, "passing argument %d of %qE as integer "
2731 "rather than complex due to prototype",
2733 else if (TREE_CODE (type) == COMPLEX_TYPE
2734 && TREE_CODE (valtype) == REAL_TYPE)
2735 warning (0, "passing argument %d of %qE as complex "
2736 "rather than floating due to prototype",
2738 else if (TREE_CODE (type) == REAL_TYPE
2739 && INTEGRAL_TYPE_P (valtype))
2740 warning (0, "passing argument %d of %qE as floating "
2741 "rather than integer due to prototype",
2743 else if (TREE_CODE (type) == COMPLEX_TYPE
2744 && INTEGRAL_TYPE_P (valtype))
2745 warning (0, "passing argument %d of %qE as complex "
2746 "rather than integer due to prototype",
2748 else if (TREE_CODE (type) == REAL_TYPE
2749 && TREE_CODE (valtype) == COMPLEX_TYPE)
2750 warning (0, "passing argument %d of %qE as floating "
2751 "rather than complex due to prototype",
2753 /* ??? At some point, messages should be written about
2754 conversions between complex types, but that's too messy
2756 else if (TREE_CODE (type) == REAL_TYPE
2757 && TREE_CODE (valtype) == REAL_TYPE)
2759 /* Warn if any argument is passed as `float',
2760 since without a prototype it would be `double'. */
2761 if (formal_prec == TYPE_PRECISION (float_type_node)
2762 && type != dfloat32_type_node)
2763 warning (0, "passing argument %d of %qE as %<float%> "
2764 "rather than %<double%> due to prototype",
2767 /* Warn if mismatch between argument and prototype
2768 for decimal float types. Warn of conversions with
2769 binary float types and of precision narrowing due to
2771 else if (type != valtype
2772 && (type == dfloat32_type_node
2773 || type == dfloat64_type_node
2774 || type == dfloat128_type_node
2775 || valtype == dfloat32_type_node
2776 || valtype == dfloat64_type_node
2777 || valtype == dfloat128_type_node)
2779 <= TYPE_PRECISION (valtype)
2780 || (type == dfloat128_type_node
2782 != dfloat64_type_node
2784 != dfloat32_type_node)))
2785 || (type == dfloat64_type_node
2787 != dfloat32_type_node))))
2788 warning (0, "passing argument %d of %qE as %qT "
2789 "rather than %qT due to prototype",
2790 argnum, rname, type, valtype);
2793 /* Detect integer changing in width or signedness.
2794 These warnings are only activated with
2795 -Wtraditional-conversion, not with -Wtraditional. */
2796 else if (warn_traditional_conversion && INTEGRAL_TYPE_P (type)
2797 && INTEGRAL_TYPE_P (valtype))
2799 tree would_have_been = default_conversion (val);
2800 tree type1 = TREE_TYPE (would_have_been);
2802 if (TREE_CODE (type) == ENUMERAL_TYPE
2803 && (TYPE_MAIN_VARIANT (type)
2804 == TYPE_MAIN_VARIANT (valtype)))
2805 /* No warning if function asks for enum
2806 and the actual arg is that enum type. */
2808 else if (formal_prec != TYPE_PRECISION (type1))
2809 warning (OPT_Wtraditional_conversion, "passing argument %d of %qE "
2810 "with different width due to prototype",
2812 else if (TYPE_UNSIGNED (type) == TYPE_UNSIGNED (type1))
2814 /* Don't complain if the formal parameter type
2815 is an enum, because we can't tell now whether
2816 the value was an enum--even the same enum. */
2817 else if (TREE_CODE (type) == ENUMERAL_TYPE)
2819 else if (TREE_CODE (val) == INTEGER_CST
2820 && int_fits_type_p (val, type))
2821 /* Change in signedness doesn't matter
2822 if a constant value is unaffected. */
2824 /* If the value is extended from a narrower
2825 unsigned type, it doesn't matter whether we
2826 pass it as signed or unsigned; the value
2827 certainly is the same either way. */
2828 else if (TYPE_PRECISION (valtype) < TYPE_PRECISION (type)
2829 && TYPE_UNSIGNED (valtype))
2831 else if (TYPE_UNSIGNED (type))
2832 warning (OPT_Wtraditional_conversion, "passing argument %d of %qE "
2833 "as unsigned due to prototype",
2836 warning (OPT_Wtraditional_conversion, "passing argument %d of %qE "
2837 "as signed due to prototype", argnum, rname);
2841 /* Possibly restore an EXCESS_PRECISION_EXPR for the
2842 sake of better warnings from convert_and_check. */
2843 if (excess_precision)
2844 val = build1 (EXCESS_PRECISION_EXPR, valtype, val);
2845 origtype = (origtypes == NULL
2847 : VEC_index (tree, origtypes, parmnum));
2848 parmval = convert_for_assignment (type, val, origtype,
2853 if (targetm.calls.promote_prototypes (fundecl ? TREE_TYPE (fundecl) : 0)
2854 && INTEGRAL_TYPE_P (type)
2855 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
2856 parmval = default_conversion (parmval);
2859 else if (TREE_CODE (valtype) == REAL_TYPE
2860 && (TYPE_PRECISION (valtype)
2861 < TYPE_PRECISION (double_type_node))
2862 && !DECIMAL_FLOAT_MODE_P (TYPE_MODE (valtype)))
2867 /* Convert `float' to `double'. */
2868 parmval = convert (double_type_node, val);
2870 else if (excess_precision && !type_generic)
2871 /* A "double" argument with excess precision being passed
2872 without a prototype or in variable arguments. */
2873 parmval = convert (valtype, val);
2874 else if ((invalid_func_diag =
2875 targetm.calls.invalid_arg_for_unprototyped_fn (typelist, fundecl, val)))
2877 error (invalid_func_diag);
2881 /* Convert `short' and `char' to full-size `int'. */
2882 parmval = default_conversion (val);
2884 VEC_replace (tree, values, parmnum, parmval);
2887 typetail = TREE_CHAIN (typetail);
2890 gcc_assert (parmnum == VEC_length (tree, values));
2892 if (typetail != 0 && TREE_VALUE (typetail) != void_type_node)
2894 error ("too few arguments to function %qE", function);
2901 /* This is the entry point used by the parser to build unary operators
2902 in the input. CODE, a tree_code, specifies the unary operator, and
2903 ARG is the operand. For unary plus, the C parser currently uses
2904 CONVERT_EXPR for code.
2906 LOC is the location to use for the tree generated.
2910 parser_build_unary_op (enum tree_code code, struct c_expr arg, location_t loc)
2912 struct c_expr result;
2914 result.value = build_unary_op (loc, code, arg.value, 0);
2915 result.original_code = code;
2916 result.original_type = NULL;
2918 if (TREE_OVERFLOW_P (result.value) && !TREE_OVERFLOW_P (arg.value))
2919 overflow_warning (result.value);
2924 /* This is the entry point used by the parser to build binary operators
2925 in the input. CODE, a tree_code, specifies the binary operator, and
2926 ARG1 and ARG2 are the operands. In addition to constructing the
2927 expression, we check for operands that were written with other binary
2928 operators in a way that is likely to confuse the user.
2930 LOCATION is the location of the binary operator. */
2933 parser_build_binary_op (location_t location, enum tree_code code,
2934 struct c_expr arg1, struct c_expr arg2)
2936 struct c_expr result;
2938 enum tree_code code1 = arg1.original_code;
2939 enum tree_code code2 = arg2.original_code;
2940 tree type1 = (arg1.original_type
2941 ? arg1.original_type
2942 : TREE_TYPE (arg1.value));
2943 tree type2 = (arg2.original_type
2944 ? arg2.original_type
2945 : TREE_TYPE (arg2.value));
2947 result.value = build_binary_op (location, code,
2948 arg1.value, arg2.value, 1);
2949 result.original_code = code;
2950 result.original_type = NULL;
2952 if (TREE_CODE (result.value) == ERROR_MARK)
2955 if (location != UNKNOWN_LOCATION)
2956 protected_set_expr_location (result.value, location);
2958 /* Check for cases such as x+y<<z which users are likely
2960 if (warn_parentheses)
2961 warn_about_parentheses (code, code1, arg1.value, code2, arg2.value);
2963 if (warn_logical_op)
2964 warn_logical_operator (input_location, code,
2965 code1, arg1.value, code2, arg2.value);
2967 /* Warn about comparisons against string literals, with the exception
2968 of testing for equality or inequality of a string literal with NULL. */
2969 if (code == EQ_EXPR || code == NE_EXPR)
2971 if ((code1 == STRING_CST && !integer_zerop (arg2.value))
2972 || (code2 == STRING_CST && !integer_zerop (arg1.value)))
2973 warning (OPT_Waddress, "comparison with string literal results in unspecified behavior");
2975 else if (TREE_CODE_CLASS (code) == tcc_comparison
2976 && (code1 == STRING_CST || code2 == STRING_CST))
2977 warning (OPT_Waddress, "comparison with string literal results in unspecified behavior");
2979 if (TREE_OVERFLOW_P (result.value)
2980 && !TREE_OVERFLOW_P (arg1.value)
2981 && !TREE_OVERFLOW_P (arg2.value))
2982 overflow_warning (result.value);
2984 /* Warn about comparisons of different enum types. */
2985 if (warn_enum_compare
2986 && TREE_CODE_CLASS (code) == tcc_comparison
2987 && TREE_CODE (type1) == ENUMERAL_TYPE
2988 && TREE_CODE (type2) == ENUMERAL_TYPE
2989 && TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2))
2990 warning_at (location, OPT_Wenum_compare,
2991 "comparison between %qT and %qT",
2997 /* Return a tree for the difference of pointers OP0 and OP1.
2998 The resulting tree has type int. */
3001 pointer_diff (tree op0, tree op1)
3003 tree restype = ptrdiff_type_node;
3005 tree target_type = TREE_TYPE (TREE_TYPE (op0));
3006 tree con0, con1, lit0, lit1;
3007 tree orig_op1 = op1;
3009 if (TREE_CODE (target_type) == VOID_TYPE)
3010 pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3011 "pointer of type %<void *%> used in subtraction");
3012 if (TREE_CODE (target_type) == FUNCTION_TYPE)
3013 pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3014 "pointer to a function used in subtraction");
3016 /* If the conversion to ptrdiff_type does anything like widening or
3017 converting a partial to an integral mode, we get a convert_expression
3018 that is in the way to do any simplifications.
3019 (fold-const.c doesn't know that the extra bits won't be needed.
3020 split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a
3021 different mode in place.)
3022 So first try to find a common term here 'by hand'; we want to cover
3023 at least the cases that occur in legal static initializers. */
3024 if (CONVERT_EXPR_P (op0)
3025 && (TYPE_PRECISION (TREE_TYPE (op0))
3026 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))))
3027 con0 = TREE_OPERAND (op0, 0);
3030 if (CONVERT_EXPR_P (op1)
3031 && (TYPE_PRECISION (TREE_TYPE (op1))
3032 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0)))))
3033 con1 = TREE_OPERAND (op1, 0);
3037 if (TREE_CODE (con0) == PLUS_EXPR)
3039 lit0 = TREE_OPERAND (con0, 1);
3040 con0 = TREE_OPERAND (con0, 0);
3043 lit0 = integer_zero_node;
3045 if (TREE_CODE (con1) == PLUS_EXPR)
3047 lit1 = TREE_OPERAND (con1, 1);
3048 con1 = TREE_OPERAND (con1, 0);
3051 lit1 = integer_zero_node;
3053 if (operand_equal_p (con0, con1, 0))
3060 /* First do the subtraction as integers;
3061 then drop through to build the divide operator.
3062 Do not do default conversions on the minus operator
3063 in case restype is a short type. */
3065 op0 = build_binary_op (input_location,
3066 MINUS_EXPR, convert (restype, op0),
3067 convert (restype, op1), 0);
3068 /* This generates an error if op1 is pointer to incomplete type. */
3069 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1))))
3070 error ("arithmetic on pointer to an incomplete type");
3072 /* This generates an error if op0 is pointer to incomplete type. */
3073 op1 = c_size_in_bytes (target_type);
3075 /* Divide by the size, in easiest possible way. */
3076 return fold_build2 (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
3079 /* Construct and perhaps optimize a tree representation
3080 for a unary operation. CODE, a tree_code, specifies the operation
3081 and XARG is the operand.
3082 For any CODE other than ADDR_EXPR, FLAG nonzero suppresses
3083 the default promotions (such as from short to int).
3084 For ADDR_EXPR, the default promotions are not applied; FLAG nonzero
3085 allows non-lvalues; this is only used to handle conversion of non-lvalue
3086 arrays to pointers in C99.
3088 LOCATION is the location of the operator. */
3091 build_unary_op (location_t location,
3092 enum tree_code code, tree xarg, int flag)
3094 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
3097 enum tree_code typecode;
3099 tree ret = error_mark_node;
3100 tree eptype = NULL_TREE;
3101 int noconvert = flag;
3102 const char *invalid_op_diag;
3105 int_operands = EXPR_INT_CONST_OPERANDS (xarg);
3107 arg = remove_c_maybe_const_expr (arg);
3109 if (code != ADDR_EXPR)
3110 arg = require_complete_type (arg);
3112 typecode = TREE_CODE (TREE_TYPE (arg));
3113 if (typecode == ERROR_MARK)
3114 return error_mark_node;
3115 if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE)
3116 typecode = INTEGER_TYPE;
3118 if ((invalid_op_diag
3119 = targetm.invalid_unary_op (code, TREE_TYPE (xarg))))
3121 error_at (location, invalid_op_diag);
3122 return error_mark_node;
3125 if (TREE_CODE (arg) == EXCESS_PRECISION_EXPR)
3127 eptype = TREE_TYPE (arg);
3128 arg = TREE_OPERAND (arg, 0);
3134 /* This is used for unary plus, because a CONVERT_EXPR
3135 is enough to prevent anybody from looking inside for
3136 associativity, but won't generate any code. */
3137 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
3138 || typecode == FIXED_POINT_TYPE || typecode == COMPLEX_TYPE
3139 || typecode == VECTOR_TYPE))
3141 error_at (location, "wrong type argument to unary plus");
3142 return error_mark_node;
3144 else if (!noconvert)
3145 arg = default_conversion (arg);
3146 arg = non_lvalue (arg);
3150 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
3151 || typecode == FIXED_POINT_TYPE || typecode == COMPLEX_TYPE
3152 || typecode == VECTOR_TYPE))
3154 error_at (location, "wrong type argument to unary minus");
3155 return error_mark_node;
3157 else if (!noconvert)
3158 arg = default_conversion (arg);
3162 /* ~ works on integer types and non float vectors. */
3163 if (typecode == INTEGER_TYPE
3164 || (typecode == VECTOR_TYPE
3165 && !VECTOR_FLOAT_TYPE_P (TREE_TYPE (arg))))
3168 arg = default_conversion (arg);
3170 else if (typecode == COMPLEX_TYPE)
3173 pedwarn (location, OPT_pedantic,
3174 "ISO C does not support %<~%> for complex conjugation");
3176 arg = default_conversion (arg);
3180 error_at (location, "wrong type argument to bit-complement");
3181 return error_mark_node;
3186 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE))
3188 error_at (location, "wrong type argument to abs");
3189 return error_mark_node;
3191 else if (!noconvert)
3192 arg = default_conversion (arg);
3196 /* Conjugating a real value is a no-op, but allow it anyway. */
3197 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
3198 || typecode == COMPLEX_TYPE))
3200 error_at (location, "wrong type argument to conjugation");
3201 return error_mark_node;
3203 else if (!noconvert)
3204 arg = default_conversion (arg);
3207 case TRUTH_NOT_EXPR:
3208 if (typecode != INTEGER_TYPE && typecode != FIXED_POINT_TYPE
3209 && typecode != REAL_TYPE && typecode != POINTER_TYPE
3210 && typecode != COMPLEX_TYPE)
3213 "wrong type argument to unary exclamation mark");
3214 return error_mark_node;
3216 arg = c_objc_common_truthvalue_conversion (location, arg);
3217 ret = invert_truthvalue (arg);
3218 /* If the TRUTH_NOT_EXPR has been folded, reset the location. */
3219 if (EXPR_P (ret) && EXPR_HAS_LOCATION (ret))
3220 location = EXPR_LOCATION (ret);
3221 goto return_build_unary_op;
3224 if (TREE_CODE (arg) == COMPLEX_CST)
3225 ret = TREE_REALPART (arg);
3226 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3227 ret = fold_build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg);
3230 if (eptype && TREE_CODE (eptype) == COMPLEX_TYPE)
3231 eptype = TREE_TYPE (eptype);
3232 goto return_build_unary_op;
3235 if (TREE_CODE (arg) == COMPLEX_CST)
3236 ret = TREE_IMAGPART (arg);
3237 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
3238 ret = fold_build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg);
3240 ret = omit_one_operand (TREE_TYPE (arg), integer_zero_node, arg);
3241 if (eptype && TREE_CODE (eptype) == COMPLEX_TYPE)
3242 eptype = TREE_TYPE (eptype);
3243 goto return_build_unary_op;
3245 case PREINCREMENT_EXPR:
3246 case POSTINCREMENT_EXPR:
3247 case PREDECREMENT_EXPR:
3248 case POSTDECREMENT_EXPR:
3250 if (TREE_CODE (arg) == C_MAYBE_CONST_EXPR)
3252 tree inner = build_unary_op (location, code,
3253 C_MAYBE_CONST_EXPR_EXPR (arg), flag);
3254 if (inner == error_mark_node)
3255 return error_mark_node;
3256 ret = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (inner),
3257 C_MAYBE_CONST_EXPR_PRE (arg), inner);
3258 gcc_assert (!C_MAYBE_CONST_EXPR_INT_OPERANDS (arg));
3259 C_MAYBE_CONST_EXPR_NON_CONST (ret) = 1;
3260 goto return_build_unary_op;
3263 /* Complain about anything that is not a true lvalue. */
3264 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
3265 || code == POSTINCREMENT_EXPR)
3268 return error_mark_node;
3270 /* Ensure the argument is fully folded inside any SAVE_EXPR. */
3271 arg = c_fully_fold (arg, false, NULL);
3273 /* Increment or decrement the real part of the value,
3274 and don't change the imaginary part. */
3275 if (typecode == COMPLEX_TYPE)
3279 pedwarn (location, OPT_pedantic,
3280 "ISO C does not support %<++%> and %<--%> on complex types");
3282 arg = stabilize_reference (arg);
3283 real = build_unary_op (EXPR_LOCATION (arg), REALPART_EXPR, arg, 1);
3284 imag = build_unary_op (EXPR_LOCATION (arg), IMAGPART_EXPR, arg, 1);
3285 real = build_unary_op (EXPR_LOCATION (arg), code, real, 1);
3286 if (real == error_mark_node || imag == error_mark_node)
3287 return error_mark_node;
3288 ret = build2 (COMPLEX_EXPR, TREE_TYPE (arg),
3290 goto return_build_unary_op;
3293 /* Report invalid types. */
3295 if (typecode != POINTER_TYPE && typecode != FIXED_POINT_TYPE
3296 && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
3298 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
3299 error_at (location, "wrong type argument to increment");
3301 error_at (location, "wrong type argument to decrement");
3303 return error_mark_node;
3309 argtype = TREE_TYPE (arg);
3311 /* Compute the increment. */
3313 if (typecode == POINTER_TYPE)
3315 /* If pointer target is an undefined struct,
3316 we just cannot know how to do the arithmetic. */
3317 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (argtype)))
3319 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
3321 "increment of pointer to unknown structure");
3324 "decrement of pointer to unknown structure");
3326 else if (TREE_CODE (TREE_TYPE (argtype)) == FUNCTION_TYPE
3327 || TREE_CODE (TREE_TYPE (argtype)) == VOID_TYPE)
3329 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
3330 pedwarn (location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3331 "wrong type argument to increment");
3333 pedwarn (location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3334 "wrong type argument to decrement");
3337 inc = c_size_in_bytes (TREE_TYPE (argtype));
3338 inc = fold_convert (sizetype, inc);
3340 else if (FRACT_MODE_P (TYPE_MODE (argtype)))
3342 /* For signed fract types, we invert ++ to -- or
3343 -- to ++, and change inc from 1 to -1, because
3344 it is not possible to represent 1 in signed fract constants.
3345 For unsigned fract types, the result always overflows and
3346 we get an undefined (original) or the maximum value. */
3347 if (code == PREINCREMENT_EXPR)
3348 code = PREDECREMENT_EXPR;
3349 else if (code == PREDECREMENT_EXPR)
3350 code = PREINCREMENT_EXPR;
3351 else if (code == POSTINCREMENT_EXPR)
3352 code = POSTDECREMENT_EXPR;
3353 else /* code == POSTDECREMENT_EXPR */
3354 code = POSTINCREMENT_EXPR;
3356 inc = integer_minus_one_node;
3357 inc = convert (argtype, inc);
3361 inc = integer_one_node;
3362 inc = convert (argtype, inc);
3365 /* Report a read-only lvalue. */
3366 if (TYPE_READONLY (argtype))
3368 readonly_error (arg,
3369 ((code == PREINCREMENT_EXPR
3370 || code == POSTINCREMENT_EXPR)
3371 ? lv_increment : lv_decrement));
3372 return error_mark_node;
3374 else if (TREE_READONLY (arg))
3375 readonly_warning (arg,
3376 ((code == PREINCREMENT_EXPR
3377 || code == POSTINCREMENT_EXPR)
3378 ? lv_increment : lv_decrement));
3380 if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
3381 val = boolean_increment (code, arg);
3383 val = build2 (code, TREE_TYPE (arg), arg, inc);
3384 TREE_SIDE_EFFECTS (val) = 1;
3385 if (TREE_CODE (val) != code)
3386 TREE_NO_WARNING (val) = 1;
3388 goto return_build_unary_op;
3392 /* Note that this operation never does default_conversion. */
3394 /* The operand of unary '&' must be an lvalue (which excludes
3395 expressions of type void), or, in C99, the result of a [] or
3396 unary '*' operator. */
3397 if (VOID_TYPE_P (TREE_TYPE (arg))
3398 && TYPE_QUALS (TREE_TYPE (arg)) == TYPE_UNQUALIFIED
3399 && (TREE_CODE (arg) != INDIRECT_REF
3401 pedwarn (location, 0, "taking address of expression of type %<void%>");
3403 /* Let &* cancel out to simplify resulting code. */
3404 if (TREE_CODE (arg) == INDIRECT_REF)
3406 /* Don't let this be an lvalue. */
3407 if (lvalue_p (TREE_OPERAND (arg, 0)))
3408 return non_lvalue (TREE_OPERAND (arg, 0));
3409 ret = TREE_OPERAND (arg, 0);
3410 goto return_build_unary_op;
3413 /* For &x[y], return x+y */
3414 if (TREE_CODE (arg) == ARRAY_REF)
3416 tree op0 = TREE_OPERAND (arg, 0);
3417 if (!c_mark_addressable (op0))
3418 return error_mark_node;
3419 return build_binary_op (location, PLUS_EXPR,
3420 (TREE_CODE (TREE_TYPE (op0)) == ARRAY_TYPE
3421 ? array_to_pointer_conversion (op0)
3423 TREE_OPERAND (arg, 1), 1);
3426 /* Anything not already handled and not a true memory reference
3427 or a non-lvalue array is an error. */
3428 else if (typecode != FUNCTION_TYPE && !flag
3429 && !lvalue_or_else (arg, lv_addressof))
3430 return error_mark_node;
3432 /* Move address operations inside C_MAYBE_CONST_EXPR to simplify
3434 if (TREE_CODE (arg) == C_MAYBE_CONST_EXPR)
3436 tree inner = build_unary_op (location, code,
3437 C_MAYBE_CONST_EXPR_EXPR (arg), flag);
3438 ret = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (inner),
3439 C_MAYBE_CONST_EXPR_PRE (arg), inner);
3440 gcc_assert (!C_MAYBE_CONST_EXPR_INT_OPERANDS (arg));
3441 C_MAYBE_CONST_EXPR_NON_CONST (ret)
3442 = C_MAYBE_CONST_EXPR_NON_CONST (arg);
3443 goto return_build_unary_op;
3446 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
3447 argtype = TREE_TYPE (arg);
3449 /* If the lvalue is const or volatile, merge that into the type
3450 to which the address will point. Note that you can't get a
3451 restricted pointer by taking the address of something, so we
3452 only have to deal with `const' and `volatile' here. */
3453 if ((DECL_P (arg) || REFERENCE_CLASS_P (arg))
3454 && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)))
3455 argtype = c_build_type_variant (argtype,
3456 TREE_READONLY (arg),
3457 TREE_THIS_VOLATILE (arg));
3459 if (!c_mark_addressable (arg))
3460 return error_mark_node;
3462 gcc_assert (TREE_CODE (arg) != COMPONENT_REF
3463 || !DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1)));
3465 argtype = build_pointer_type (argtype);
3467 /* ??? Cope with user tricks that amount to offsetof. Delete this
3468 when we have proper support for integer constant expressions. */
3469 val = get_base_address (arg);
3470 if (val && TREE_CODE (val) == INDIRECT_REF
3471 && TREE_CONSTANT (TREE_OPERAND (val, 0)))
3473 tree op0 = fold_convert (sizetype, fold_offsetof (arg, val)), op1;
3475 op1 = fold_convert (argtype, TREE_OPERAND (val, 0));
3476 ret = fold_build2 (POINTER_PLUS_EXPR, argtype, op1, op0);
3477 goto return_build_unary_op;
3480 val = build1 (ADDR_EXPR, argtype, arg);
3483 goto return_build_unary_op;
3490 argtype = TREE_TYPE (arg);
3491 if (TREE_CODE (arg) == INTEGER_CST)
3492 ret = (require_constant_value
3493 ? fold_build1_initializer (code, argtype, arg)
3494 : fold_build1 (code, argtype, arg));
3496 ret = build1 (code, argtype, arg);
3497 return_build_unary_op:
3498 gcc_assert (ret != error_mark_node);
3499 if (TREE_CODE (ret) == INTEGER_CST && !TREE_OVERFLOW (ret)
3500 && !(TREE_CODE (xarg) == INTEGER_CST && !TREE_OVERFLOW (xarg)))
3501 ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
3502 else if (TREE_CODE (ret) != INTEGER_CST && int_operands)
3503 ret = note_integer_operands (ret);
3505 ret = build1 (EXCESS_PRECISION_EXPR, eptype, ret);
3506 protected_set_expr_location (ret, location);
3510 /* Return nonzero if REF is an lvalue valid for this language.
3511 Lvalues can be assigned, unless their type has TYPE_READONLY.
3512 Lvalues can have their address taken, unless they have C_DECL_REGISTER. */
3515 lvalue_p (const_tree ref)
3517 const enum tree_code code = TREE_CODE (ref);
3524 return lvalue_p (TREE_OPERAND (ref, 0));
3526 case C_MAYBE_CONST_EXPR:
3527 return lvalue_p (TREE_OPERAND (ref, 1));
3529 case COMPOUND_LITERAL_EXPR:
3539 return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
3540 && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
3543 return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
3550 /* Give an error for storing in something that is 'const'. */
3553 readonly_error (tree arg, enum lvalue_use use)
3555 gcc_assert (use == lv_assign || use == lv_increment || use == lv_decrement
3557 /* Using this macro rather than (for example) arrays of messages
3558 ensures that all the format strings are checked at compile
3560 #define READONLY_MSG(A, I, D, AS) (use == lv_assign ? (A) \
3561 : (use == lv_increment ? (I) \
3562 : (use == lv_decrement ? (D) : (AS))))
3563 if (TREE_CODE (arg) == COMPONENT_REF)
3565 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
3566 readonly_error (TREE_OPERAND (arg, 0), use);
3568 error (READONLY_MSG (G_("assignment of read-only member %qD"),
3569 G_("increment of read-only member %qD"),
3570 G_("decrement of read-only member %qD"),
3571 G_("read-only member %qD used as %<asm%> output")),
3572 TREE_OPERAND (arg, 1));
3574 else if (TREE_CODE (arg) == VAR_DECL)
3575 error (READONLY_MSG (G_("assignment of read-only variable %qD"),
3576 G_("increment of read-only variable %qD"),
3577 G_("decrement of read-only variable %qD"),
3578 G_("read-only variable %qD used as %<asm%> output")),
3581 error (READONLY_MSG (G_("assignment of read-only location %qE"),
3582 G_("increment of read-only location %qE"),
3583 G_("decrement of read-only location %qE"),
3584 G_("read-only location %qE used as %<asm%> output")),
3588 /* Give a warning for storing in something that is read-only in GCC
3589 terms but not const in ISO C terms. */
3592 readonly_warning (tree arg, enum lvalue_use use)
3597 warning (0, "assignment of read-only location %qE", arg);
3600 warning (0, "increment of read-only location %qE", arg);
3603 warning (0, "decrement of read-only location %qE", arg);
3612 /* Return nonzero if REF is an lvalue valid for this language;
3613 otherwise, print an error message and return zero. USE says
3614 how the lvalue is being used and so selects the error message. */
3617 lvalue_or_else (const_tree ref, enum lvalue_use use)
3619 int win = lvalue_p (ref);
3627 /* Mark EXP saying that we need to be able to take the
3628 address of it; it should not be allocated in a register.
3629 Returns true if successful. */
3632 c_mark_addressable (tree exp)
3637 switch (TREE_CODE (x))
3640 if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
3643 ("cannot take address of bit-field %qD", TREE_OPERAND (x, 1));
3647 /* ... fall through ... */
3653 x = TREE_OPERAND (x, 0);
3656 case COMPOUND_LITERAL_EXPR:
3658 TREE_ADDRESSABLE (x) = 1;
3665 if (C_DECL_REGISTER (x)
3666 && DECL_NONLOCAL (x))
3668 if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
3671 ("global register variable %qD used in nested function", x);
3674 pedwarn (input_location, 0, "register variable %qD used in nested function", x);
3676 else if (C_DECL_REGISTER (x))
3678 if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x))
3679 error ("address of global register variable %qD requested", x);
3681 error ("address of register variable %qD requested", x);
3687 TREE_ADDRESSABLE (x) = 1;
3694 /* Build and return a conditional expression IFEXP ? OP1 : OP2. If
3695 IFEXP_BCP then the condition is a call to __builtin_constant_p, and
3696 if folded to an integer constant then the unselected half may
3697 contain arbitrary operations not normally permitted in constant
3701 build_conditional_expr (tree ifexp, bool ifexp_bcp, tree op1, tree op2)
3705 enum tree_code code1;
3706 enum tree_code code2;
3707 tree result_type = NULL;
3708 tree ep_result_type = NULL;
3709 tree orig_op1 = op1, orig_op2 = op2;
3710 bool int_const, op1_int_operands, op2_int_operands, int_operands;
3711 bool ifexp_int_operands;
3715 op1_int_operands = EXPR_INT_CONST_OPERANDS (orig_op1);
3716 if (op1_int_operands)
3717 op1 = remove_c_maybe_const_expr (op1);
3718 op2_int_operands = EXPR_INT_CONST_OPERANDS (orig_op2);
3719 if (op2_int_operands)
3720 op2 = remove_c_maybe_const_expr (op2);
3721 ifexp_int_operands = EXPR_INT_CONST_OPERANDS (ifexp);
3722 if (ifexp_int_operands)
3723 ifexp = remove_c_maybe_const_expr (ifexp);
3725 /* Promote both alternatives. */
3727 if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
3728 op1 = default_conversion (op1);
3729 if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
3730 op2 = default_conversion (op2);
3732 if (TREE_CODE (ifexp) == ERROR_MARK
3733 || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
3734 || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
3735 return error_mark_node;
3737 type1 = TREE_TYPE (op1);
3738 code1 = TREE_CODE (type1);
3739 type2 = TREE_TYPE (op2);
3740 code2 = TREE_CODE (type2);
3742 /* C90 does not permit non-lvalue arrays in conditional expressions.
3743 In C99 they will be pointers by now. */
3744 if (code1 == ARRAY_TYPE || code2 == ARRAY_TYPE)
3746 error ("non-lvalue array in conditional expression");
3747 return error_mark_node;
3750 objc_ok = objc_compare_types (type1, type2, -3, NULL_TREE);
3752 if ((TREE_CODE (op1) == EXCESS_PRECISION_EXPR
3753 || TREE_CODE (op2) == EXCESS_PRECISION_EXPR)
3754 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
3755 || code1 == COMPLEX_TYPE)
3756 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
3757 || code2 == COMPLEX_TYPE))
3759 ep_result_type = c_common_type (type1, type2);
3760 if (TREE_CODE (op1) == EXCESS_PRECISION_EXPR)
3762 op1 = TREE_OPERAND (op1, 0);
3763 type1 = TREE_TYPE (op1);
3764 gcc_assert (TREE_CODE (type1) == code1);
3766 if (TREE_CODE (op2) == EXCESS_PRECISION_EXPR)
3768 op2 = TREE_OPERAND (op2, 0);
3769 type2 = TREE_TYPE (op2);
3770 gcc_assert (TREE_CODE (type2) == code2);
3774 /* Quickly detect the usual case where op1 and op2 have the same type
3776 if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
3779 result_type = type1;
3781 result_type = TYPE_MAIN_VARIANT (type1);
3783 else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE
3784 || code1 == COMPLEX_TYPE)
3785 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
3786 || code2 == COMPLEX_TYPE))
3788 result_type = c_common_type (type1, type2);
3790 /* If -Wsign-compare, warn here if type1 and type2 have
3791 different signedness. We'll promote the signed to unsigned
3792 and later code won't know it used to be different.
3793 Do this check on the original types, so that explicit casts
3794 will be considered, but default promotions won't. */
3795 if (!skip_evaluation)
3797 int unsigned_op1 = TYPE_UNSIGNED (TREE_TYPE (orig_op1));
3798 int unsigned_op2 = TYPE_UNSIGNED (TREE_TYPE (orig_op2));
3800 if (unsigned_op1 ^ unsigned_op2)
3804 /* Do not warn if the result type is signed, since the
3805 signed type will only be chosen if it can represent
3806 all the values of the unsigned type. */
3807 if (!TYPE_UNSIGNED (result_type))
3811 bool op1_maybe_const = true;
3812 bool op2_maybe_const = true;
3814 /* Do not warn if the signed quantity is an
3815 unsuffixed integer literal (or some static
3816 constant expression involving such literals) and
3817 it is non-negative. This warning requires the
3818 operands to be folded for best results, so do
3819 that folding in this case even without
3820 warn_sign_compare to avoid warning options
3821 possibly affecting code generation. */
3822 op1 = c_fully_fold (op1, require_constant_value,
3824 op2 = c_fully_fold (op2, require_constant_value,
3827 if (warn_sign_compare)
3830 && tree_expr_nonnegative_warnv_p (op1, &ovf))
3832 && tree_expr_nonnegative_warnv_p (op2, &ovf)))
3835 warning (OPT_Wsign_compare, "signed and unsigned type in conditional expression");
3837 if (!op1_maybe_const || TREE_CODE (op1) != INTEGER_CST)
3839 op1 = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (op1),
3841 C_MAYBE_CONST_EXPR_NON_CONST (op1) = !op1_maybe_const;
3843 if (!op2_maybe_const || TREE_CODE (op2) != INTEGER_CST)
3845 op2 = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (op2),
3847 C_MAYBE_CONST_EXPR_NON_CONST (op2) = !op2_maybe_const;
3853 else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
3855 if (code1 != VOID_TYPE || code2 != VOID_TYPE)
3856 pedwarn (input_location, OPT_pedantic,
3857 "ISO C forbids conditional expr with only one void side");
3858 result_type = void_type_node;
3860 else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
3862 if (comp_target_types (type1, type2))
3863 result_type = common_pointer_type (type1, type2);
3864 else if (null_pointer_constant_p (orig_op1))
3865 result_type = qualify_type (type2, type1);
3866 else if (null_pointer_constant_p (orig_op2))
3867 result_type = qualify_type (type1, type2);
3868 else if (VOID_TYPE_P (TREE_TYPE (type1)))
3870 if (TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
3871 pedwarn (input_location, OPT_pedantic,
3872 "ISO C forbids conditional expr between "
3873 "%<void *%> and function pointer");
3874 result_type = build_pointer_type (qualify_type (TREE_TYPE (type1),
3875 TREE_TYPE (type2)));
3877 else if (VOID_TYPE_P (TREE_TYPE (type2)))
3879 if (TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
3880 pedwarn (input_location, OPT_pedantic,
3881 "ISO C forbids conditional expr between "
3882 "%<void *%> and function pointer");
3883 result_type = build_pointer_type (qualify_type (TREE_TYPE (type2),
3884 TREE_TYPE (type1)));
3889 pedwarn (input_location, 0,
3890 "pointer type mismatch in conditional expression");
3891 result_type = build_pointer_type (void_type_node);
3894 else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
3896 if (!null_pointer_constant_p (orig_op2))
3897 pedwarn (input_location, 0,
3898 "pointer/integer type mismatch in conditional expression");
3901 op2 = null_pointer_node;
3903 result_type = type1;
3905 else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
3907 if (!null_pointer_constant_p (orig_op1))
3908 pedwarn (input_location, 0,
3909 "pointer/integer type mismatch in conditional expression");
3912 op1 = null_pointer_node;
3914 result_type = type2;
3919 if (flag_cond_mismatch)
3920 result_type = void_type_node;
3923 error ("type mismatch in conditional expression");
3924 return error_mark_node;
3928 /* Merge const and volatile flags of the incoming types. */
3930 = build_type_variant (result_type,
3931 TREE_READONLY (op1) || TREE_READONLY (op2),
3932 TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
3934 if (result_type != TREE_TYPE (op1))
3935 op1 = convert_and_check (result_type, op1);
3936 if (result_type != TREE_TYPE (op2))
3937 op2 = convert_and_check (result_type, op2);
3939 if (ifexp_bcp && ifexp == truthvalue_true_node)
3941 op2_int_operands = true;
3942 op1 = c_fully_fold (op1, require_constant_value, NULL);
3944 if (ifexp_bcp && ifexp == truthvalue_false_node)
3946 op1_int_operands = true;
3947 op2 = c_fully_fold (op2, require_constant_value, NULL);
3949 int_const = int_operands = (ifexp_int_operands
3951 && op2_int_operands);
3954 int_const = ((ifexp == truthvalue_true_node
3955 && TREE_CODE (orig_op1) == INTEGER_CST
3956 && !TREE_OVERFLOW (orig_op1))
3957 || (ifexp == truthvalue_false_node
3958 && TREE_CODE (orig_op2) == INTEGER_CST
3959 && !TREE_OVERFLOW (orig_op2)));
3961 if (int_const || (ifexp_bcp && TREE_CODE (ifexp) == INTEGER_CST))
3962 ret = fold_build3 (COND_EXPR, result_type, ifexp, op1, op2);
3965 ret = build3 (COND_EXPR, result_type, ifexp, op1, op2);
3967 ret = note_integer_operands (ret);
3970 ret = build1 (EXCESS_PRECISION_EXPR, ep_result_type, ret);
3975 /* Return a compound expression that performs two expressions and
3976 returns the value of the second of them. */
3979 build_compound_expr (tree expr1, tree expr2)
3981 bool expr1_int_operands, expr2_int_operands;
3982 tree eptype = NULL_TREE;
3985 expr1_int_operands = EXPR_INT_CONST_OPERANDS (expr1);
3986 if (expr1_int_operands)
3987 expr1 = remove_c_maybe_const_expr (expr1);
3988 expr2_int_operands = EXPR_INT_CONST_OPERANDS (expr2);
3989 if (expr2_int_operands)
3990 expr2 = remove_c_maybe_const_expr (expr2);
3992 if (TREE_CODE (expr1) == EXCESS_PRECISION_EXPR)
3993 expr1 = TREE_OPERAND (expr1, 0);
3994 if (TREE_CODE (expr2) == EXCESS_PRECISION_EXPR)
3996 eptype = TREE_TYPE (expr2);
3997 expr2 = TREE_OPERAND (expr2, 0);
4000 if (!TREE_SIDE_EFFECTS (expr1))
4002 /* The left-hand operand of a comma expression is like an expression
4003 statement: with -Wunused, we should warn if it doesn't have
4004 any side-effects, unless it was explicitly cast to (void). */
4005 if (warn_unused_value)
4007 if (VOID_TYPE_P (TREE_TYPE (expr1))
4008 && CONVERT_EXPR_P (expr1))
4010 else if (VOID_TYPE_P (TREE_TYPE (expr1))
4011 && TREE_CODE (expr1) == COMPOUND_EXPR
4012 && CONVERT_EXPR_P (TREE_OPERAND (expr1, 1)))
4013 ; /* (void) a, (void) b, c */
4015 warning (OPT_Wunused_value,
4016 "left-hand operand of comma expression has no effect");
4020 /* With -Wunused, we should also warn if the left-hand operand does have
4021 side-effects, but computes a value which is not used. For example, in
4022 `foo() + bar(), baz()' the result of the `+' operator is not used,
4023 so we should issue a warning. */
4024 else if (warn_unused_value)
4025 warn_if_unused_value (expr1, input_location);
4027 if (expr2 == error_mark_node)
4028 return error_mark_node;
4030 ret = build2 (COMPOUND_EXPR, TREE_TYPE (expr2), expr1, expr2);
4033 && expr1_int_operands
4034 && expr2_int_operands)
4035 ret = note_integer_operands (ret);
4038 ret = build1 (EXCESS_PRECISION_EXPR, eptype, ret);
4043 /* Build an expression representing a cast to type TYPE of expression EXPR. */
4046 build_c_cast (tree type, tree expr)
4050 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR)
4051 expr = TREE_OPERAND (expr, 0);
4055 if (type == error_mark_node || expr == error_mark_node)
4056 return error_mark_node;
4058 /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing
4059 only in <protocol> qualifications. But when constructing cast expressions,
4060 the protocols do matter and must be kept around. */
4061 if (objc_is_object_ptr (type) && objc_is_object_ptr (TREE_TYPE (expr)))
4062 return build1 (NOP_EXPR, type, expr);
4064 type = TYPE_MAIN_VARIANT (type);
4066 if (TREE_CODE (type) == ARRAY_TYPE)
4068 error ("cast specifies array type");
4069 return error_mark_node;
4072 if (TREE_CODE (type) == FUNCTION_TYPE)
4074 error ("cast specifies function type");
4075 return error_mark_node;
4078 if (!VOID_TYPE_P (type))
4080 value = require_complete_type (value);
4081 if (value == error_mark_node)
4082 return error_mark_node;
4085 if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value)))
4087 if (TREE_CODE (type) == RECORD_TYPE
4088 || TREE_CODE (type) == UNION_TYPE)
4089 pedwarn (input_location, OPT_pedantic,
4090 "ISO C forbids casting nonscalar to the same type");
4092 else if (TREE_CODE (type) == UNION_TYPE)
4096 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
4097 if (TREE_TYPE (field) != error_mark_node
4098 && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
4099 TYPE_MAIN_VARIANT (TREE_TYPE (value))))
4106 pedwarn (input_location, OPT_pedantic,
4107 "ISO C forbids casts to union type");
4108 t = digest_init (type,
4109 build_constructor_single (type, field, value),
4110 NULL_TREE, false, true, 0);
4111 TREE_CONSTANT (t) = TREE_CONSTANT (value);
4114 error ("cast to union type from type not present in union");
4115 return error_mark_node;
4121 if (type == void_type_node)
4122 return build1 (CONVERT_EXPR, type, value);
4124 otype = TREE_TYPE (value);
4126 /* Optionally warn about potentially worrisome casts. */
4129 && TREE_CODE (type) == POINTER_TYPE
4130 && TREE_CODE (otype) == POINTER_TYPE)
4132 tree in_type = type;
4133 tree in_otype = otype;
4137 /* Check that the qualifiers on IN_TYPE are a superset of
4138 the qualifiers of IN_OTYPE. The outermost level of
4139 POINTER_TYPE nodes is uninteresting and we stop as soon
4140 as we hit a non-POINTER_TYPE node on either type. */
4143 in_otype = TREE_TYPE (in_otype);
4144 in_type = TREE_TYPE (in_type);
4146 /* GNU C allows cv-qualified function types. 'const'
4147 means the function is very pure, 'volatile' means it
4148 can't return. We need to warn when such qualifiers
4149 are added, not when they're taken away. */
4150 if (TREE_CODE (in_otype) == FUNCTION_TYPE
4151 && TREE_CODE (in_type) == FUNCTION_TYPE)
4152 added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype));
4154 discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
4156 while (TREE_CODE (in_type) == POINTER_TYPE
4157 && TREE_CODE (in_otype) == POINTER_TYPE);
4160 warning (OPT_Wcast_qual, "cast adds new qualifiers to function type");
4163 /* There are qualifiers present in IN_OTYPE that are not
4164 present in IN_TYPE. */
4165 warning (OPT_Wcast_qual, "cast discards qualifiers from pointer target type");
4168 /* Warn about possible alignment problems. */
4169 if (STRICT_ALIGNMENT
4170 && TREE_CODE (type) == POINTER_TYPE
4171 && TREE_CODE (otype) == POINTER_TYPE
4172 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
4173 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
4174 /* Don't warn about opaque types, where the actual alignment
4175 restriction is unknown. */
4176 && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
4177 || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
4178 && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
4179 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
4180 warning (OPT_Wcast_align,
4181 "cast increases required alignment of target type");
4183 if (TREE_CODE (type) == INTEGER_TYPE
4184 && TREE_CODE (otype) == POINTER_TYPE
4185 && TYPE_PRECISION (type) != TYPE_PRECISION (otype))
4186 /* Unlike conversion of integers to pointers, where the
4187 warning is disabled for converting constants because
4188 of cases such as SIG_*, warn about converting constant
4189 pointers to integers. In some cases it may cause unwanted
4190 sign extension, and a warning is appropriate. */
4191 warning (OPT_Wpointer_to_int_cast,
4192 "cast from pointer to integer of different size");
4194 if (TREE_CODE (value) == CALL_EXPR
4195 && TREE_CODE (type) != TREE_CODE (otype))
4196 warning (OPT_Wbad_function_cast, "cast from function call of type %qT "
4197 "to non-matching type %qT", otype, type);
4199 if (TREE_CODE (type) == POINTER_TYPE
4200 && TREE_CODE (otype) == INTEGER_TYPE
4201 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
4202 /* Don't warn about converting any constant. */
4203 && !TREE_CONSTANT (value))
4204 warning (OPT_Wint_to_pointer_cast, "cast to pointer from integer "
4205 "of different size");
4207 if (warn_strict_aliasing <= 2)
4208 strict_aliasing_warning (otype, type, expr);
4210 /* If pedantic, warn for conversions between function and object
4211 pointer types, except for converting a null pointer constant
4212 to function pointer type. */
4214 && TREE_CODE (type) == POINTER_TYPE
4215 && TREE_CODE (otype) == POINTER_TYPE
4216 && TREE_CODE (TREE_TYPE (otype)) == FUNCTION_TYPE
4217 && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE)
4218 pedwarn (input_location, OPT_pedantic, "ISO C forbids "
4219 "conversion of function pointer to object pointer type");
4222 && TREE_CODE (type) == POINTER_TYPE
4223 && TREE_CODE (otype) == POINTER_TYPE
4224 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
4225 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
4226 && !null_pointer_constant_p (value))
4227 pedwarn (input_location, OPT_pedantic, "ISO C forbids "
4228 "conversion of object pointer to function pointer type");
4231 value = convert (type, value);
4233 /* Ignore any integer overflow caused by the cast. */
4234 if (TREE_CODE (value) == INTEGER_CST && !FLOAT_TYPE_P (otype))
4236 if (CONSTANT_CLASS_P (ovalue) && TREE_OVERFLOW (ovalue))
4238 if (!TREE_OVERFLOW (value))
4240 /* Avoid clobbering a shared constant. */
4241 value = copy_node (value);
4242 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
4245 else if (TREE_OVERFLOW (value))
4246 /* Reset VALUE's overflow flags, ensuring constant sharing. */
4247 value = build_int_cst_wide (TREE_TYPE (value),
4248 TREE_INT_CST_LOW (value),
4249 TREE_INT_CST_HIGH (value));
4253 /* Don't let a cast be an lvalue. */
4255 value = non_lvalue (value);
4257 /* Don't allow the results of casting to floating-point or complex
4258 types be confused with actual constants, or casts involving
4259 integer and pointer types other than direct integer-to-integer
4260 and integer-to-pointer be confused with integer constant
4261 expressions and null pointer constants. */
4262 if (TREE_CODE (value) == REAL_CST
4263 || TREE_CODE (value) == COMPLEX_CST
4264 || (TREE_CODE (value) == INTEGER_CST
4265 && !((TREE_CODE (expr) == INTEGER_CST
4266 && INTEGRAL_TYPE_P (TREE_TYPE (expr)))
4267 || TREE_CODE (expr) == REAL_CST
4268 || TREE_CODE (expr) == COMPLEX_CST)))
4269 value = build1 (NOP_EXPR, type, value);
4274 /* Interpret a cast of expression EXPR to type TYPE. */
4276 c_cast_expr (struct c_type_name *type_name, tree expr, location_t loc)
4279 tree type_expr = NULL_TREE;
4280 bool type_expr_const = true;
4282 int saved_wsp = warn_strict_prototypes;
4284 /* This avoids warnings about unprototyped casts on
4285 integers. E.g. "#define SIG_DFL (void(*)())0". */
4286 if (TREE_CODE (expr) == INTEGER_CST)
4287 warn_strict_prototypes = 0;
4288 type = groktypename (type_name, &type_expr, &type_expr_const);
4289 warn_strict_prototypes = saved_wsp;
4291 ret = build_c_cast (type, expr);
4294 ret = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (ret), type_expr, ret);
4295 C_MAYBE_CONST_EXPR_NON_CONST (ret) = !type_expr_const;
4298 if (CAN_HAVE_LOCATION_P (ret) && !EXPR_HAS_LOCATION (ret))
4299 SET_EXPR_LOCATION (ret, loc);
4301 /* C++ does not permits types to be defined in a cast. */
4302 if (warn_cxx_compat && type_name->specs->tag_defined_p)
4303 warning_at (loc, OPT_Wc___compat,
4304 "defining a type in a cast is invalid in C++");
4309 /* Build an assignment expression of lvalue LHS from value RHS.
4310 If LHS_ORIGTYPE is not NULL, it is the original type of LHS, which
4311 may differ from TREE_TYPE (LHS) for an enum bitfield.
4312 MODIFYCODE is the code for a binary operator that we use
4313 to combine the old value of LHS with RHS to get the new value.
4314 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment.
4315 If RHS_ORIGTYPE is not NULL_TREE, it is the original type of RHS,
4316 which may differ from TREE_TYPE (RHS) for an enum value.
4318 LOCATION is the location of the MODIFYCODE operator. */
4321 build_modify_expr (location_t location, tree lhs, tree lhs_origtype,
4322 enum tree_code modifycode, tree rhs, tree rhs_origtype)
4326 tree rhs_semantic_type = NULL_TREE;
4327 tree lhstype = TREE_TYPE (lhs);
4328 tree olhstype = lhstype;
4331 /* Types that aren't fully specified cannot be used in assignments. */
4332 lhs = require_complete_type (lhs);
4334 /* Avoid duplicate error messages from operands that had errors. */
4335 if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
4336 return error_mark_node;
4338 if (!lvalue_or_else (lhs, lv_assign))
4339 return error_mark_node;
4341 if (TREE_CODE (rhs) == EXCESS_PRECISION_EXPR)
4343 rhs_semantic_type = TREE_TYPE (rhs);
4344 rhs = TREE_OPERAND (rhs, 0);
4349 if (TREE_CODE (lhs) == C_MAYBE_CONST_EXPR)
4351 tree inner = build_modify_expr (location, C_MAYBE_CONST_EXPR_EXPR (lhs),
4352 lhs_origtype, modifycode, rhs,
4354 if (inner == error_mark_node)
4355 return error_mark_node;
4356 result = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (inner),
4357 C_MAYBE_CONST_EXPR_PRE (lhs), inner);
4358 gcc_assert (!C_MAYBE_CONST_EXPR_INT_OPERANDS (lhs));
4359 C_MAYBE_CONST_EXPR_NON_CONST (result) = 1;
4360 protected_set_expr_location (result, location);
4364 /* If a binary op has been requested, combine the old LHS value with the RHS
4365 producing the value we should actually store into the LHS. */
4367 if (modifycode != NOP_EXPR)
4369 lhs = c_fully_fold (lhs, false, NULL);
4370 lhs = stabilize_reference (lhs);
4371 newrhs = build_binary_op (location,
4372 modifycode, lhs, rhs, 1);
4374 /* The original type of the right hand side is no longer
4376 rhs_origtype = NULL_TREE;
4379 /* Give an error for storing in something that is 'const'. */
4381 if (TYPE_READONLY (lhstype)
4382 || ((TREE_CODE (lhstype) == RECORD_TYPE
4383 || TREE_CODE (lhstype) == UNION_TYPE)
4384 && C_TYPE_FIELDS_READONLY (lhstype)))
4386 readonly_error (lhs, lv_assign);
4387 return error_mark_node;
4389 else if (TREE_READONLY (lhs))
4390 readonly_warning (lhs, lv_assign);
4392 /* If storing into a structure or union member,
4393 it has probably been given type `int'.
4394 Compute the type that would go with
4395 the actual amount of storage the member occupies. */
4397 if (TREE_CODE (lhs) == COMPONENT_REF
4398 && (TREE_CODE (lhstype) == INTEGER_TYPE
4399 || TREE_CODE (lhstype) == BOOLEAN_TYPE
4400 || TREE_CODE (lhstype) == REAL_TYPE
4401 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
4402 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
4404 /* If storing in a field that is in actuality a short or narrower than one,
4405 we must store in the field in its actual type. */
4407 if (lhstype != TREE_TYPE (lhs))
4409 lhs = copy_node (lhs);
4410 TREE_TYPE (lhs) = lhstype;
4413 /* Issue -Wc++-compat warnings about an assignment to an enum type
4414 when LHS does not have its original type. This happens for,
4415 e.g., an enum bitfield in a struct. */
4417 && lhs_origtype != NULL_TREE
4418 && lhs_origtype != lhstype
4419 && TREE_CODE (lhs_origtype) == ENUMERAL_TYPE)
4421 tree checktype = (rhs_origtype != NULL_TREE
4424 if (checktype != error_mark_node
4425 && TYPE_MAIN_VARIANT (checktype) != TYPE_MAIN_VARIANT (lhs_origtype))
4426 warning_at (location, OPT_Wc___compat,
4427 "enum conversion in assignment is invalid in C++");
4430 /* Convert new value to destination type. Fold it first, then
4431 restore any excess precision information, for the sake of
4432 conversion warnings. */
4434 npc = null_pointer_constant_p (newrhs);
4435 newrhs = c_fully_fold (newrhs, false, NULL);
4436 if (rhs_semantic_type)
4437 newrhs = build1 (EXCESS_PRECISION_EXPR, rhs_semantic_type, newrhs);
4438 newrhs = convert_for_assignment (lhstype, newrhs, rhs_origtype, ic_assign,
4439 npc, NULL_TREE, NULL_TREE, 0);
4440 if (TREE_CODE (newrhs) == ERROR_MARK)
4441 return error_mark_node;
4443 /* Emit ObjC write barrier, if necessary. */
4444 if (c_dialect_objc () && flag_objc_gc)
4446 result = objc_generate_write_barrier (lhs, modifycode, newrhs);
4449 protected_set_expr_location (result, location);
4454 /* Scan operands. */
4456 result = build2 (MODIFY_EXPR, lhstype, lhs, newrhs);
4457 TREE_SIDE_EFFECTS (result) = 1;
4458 protected_set_expr_location (result, location);
4460 /* If we got the LHS in a different type for storing in,
4461 convert the result back to the nominal type of LHS
4462 so that the value we return always has the same type
4463 as the LHS argument. */
4465 if (olhstype == TREE_TYPE (result))
4468 result = convert_for_assignment (olhstype, result, rhs_origtype, ic_assign,
4469 false, NULL_TREE, NULL_TREE, 0);
4470 protected_set_expr_location (result, location);
4474 /* Convert value RHS to type TYPE as preparation for an assignment to
4475 an lvalue of type TYPE. If ORIGTYPE is not NULL_TREE, it is the
4476 original type of RHS; this differs from TREE_TYPE (RHS) for enum
4477 types. NULL_POINTER_CONSTANT says whether RHS was a null pointer
4478 constant before any folding.
4479 The real work of conversion is done by `convert'.
4480 The purpose of this function is to generate error messages
4481 for assignments that are not allowed in C.
4482 ERRTYPE says whether it is argument passing, assignment,
4483 initialization or return.
4485 FUNCTION is a tree for the function being called.
4486 PARMNUM is the number of the argument, for printing in error messages. */
4489 convert_for_assignment (tree type, tree rhs, tree origtype,
4490 enum impl_conv errtype, bool null_pointer_constant,
4491 tree fundecl, tree function, int parmnum)
4493 enum tree_code codel = TREE_CODE (type);
4494 tree orig_rhs = rhs;
4496 enum tree_code coder;
4497 tree rname = NULL_TREE;
4498 bool objc_ok = false;
4500 if (errtype == ic_argpass)
4503 /* Change pointer to function to the function itself for
4505 if (TREE_CODE (function) == ADDR_EXPR
4506 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)
4507 function = TREE_OPERAND (function, 0);
4509 /* Handle an ObjC selector specially for diagnostics. */
4510 selector = objc_message_selector ();
4512 if (selector && parmnum > 2)
4519 /* This macro is used to emit diagnostics to ensure that all format
4520 strings are complete sentences, visible to gettext and checked at
4522 #define WARN_FOR_ASSIGNMENT(LOCATION, OPT, AR, AS, IN, RE) \
4527 if (pedwarn (LOCATION, OPT, AR, parmnum, rname)) \
4528 inform ((fundecl && !DECL_IS_BUILTIN (fundecl)) \
4529 ? DECL_SOURCE_LOCATION (fundecl) : LOCATION, \
4530 "expected %qT but argument is of type %qT", \
4534 pedwarn (LOCATION, OPT, AS); \
4537 pedwarn (LOCATION, OPT, IN); \
4540 pedwarn (LOCATION, OPT, RE); \
4543 gcc_unreachable (); \
4547 if (TREE_CODE (rhs) == EXCESS_PRECISION_EXPR)
4548 rhs = TREE_OPERAND (rhs, 0);
4550 rhstype = TREE_TYPE (rhs);
4551 coder = TREE_CODE (rhstype);
4553 if (coder == ERROR_MARK)
4554 return error_mark_node;
4556 if (c_dialect_objc ())
4579 objc_ok = objc_compare_types (type, rhstype, parmno, rname);
4582 if (warn_cxx_compat)
4584 tree checktype = origtype != NULL_TREE ? origtype : rhstype;
4585 if (checktype != error_mark_node
4586 && TREE_CODE (type) == ENUMERAL_TYPE
4587 && TYPE_MAIN_VARIANT (checktype) != TYPE_MAIN_VARIANT (type))
4589 WARN_FOR_ASSIGNMENT (input_location, OPT_Wc___compat,
4590 G_("enum conversion when passing argument "
4591 "%d of %qE is invalid in C++"),
4592 G_("enum conversion in assignment is "
4594 G_("enum conversion in initialization is "
4596 G_("enum conversion in return is "
4601 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
4604 if (coder == VOID_TYPE)
4606 /* Except for passing an argument to an unprototyped function,
4607 this is a constraint violation. When passing an argument to
4608 an unprototyped function, it is compile-time undefined;
4609 making it a constraint in that case was rejected in
4611 error ("void value not ignored as it ought to be");
4612 return error_mark_node;
4614 rhs = require_complete_type (rhs);
4615 if (rhs == error_mark_node)
4616 return error_mark_node;
4617 /* A type converts to a reference to it.
4618 This code doesn't fully support references, it's just for the
4619 special case of va_start and va_copy. */
4620 if (codel == REFERENCE_TYPE
4621 && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1)
4623 if (!lvalue_p (rhs))
4625 error ("cannot pass rvalue to reference parameter");
4626 return error_mark_node;
4628 if (!c_mark_addressable (rhs))
4629 return error_mark_node;
4630 rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs);
4632 /* We already know that these two types are compatible, but they
4633 may not be exactly identical. In fact, `TREE_TYPE (type)' is
4634 likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
4635 likely to be va_list, a typedef to __builtin_va_list, which
4636 is different enough that it will cause problems later. */
4637 if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type))
4638 rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs);
4640 rhs = build1 (NOP_EXPR, type, rhs);
4643 /* Some types can interconvert without explicit casts. */
4644 else if (codel == VECTOR_TYPE && coder == VECTOR_TYPE
4645 && vector_types_convertible_p (type, TREE_TYPE (rhs), true))
4646 return convert (type, rhs);
4647 /* Arithmetic types all interconvert, and enum is treated like int. */
4648 else if ((codel == INTEGER_TYPE || codel == REAL_TYPE
4649 || codel == FIXED_POINT_TYPE
4650 || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE
4651 || codel == BOOLEAN_TYPE)
4652 && (coder == INTEGER_TYPE || coder == REAL_TYPE
4653 || coder == FIXED_POINT_TYPE
4654 || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE
4655 || coder == BOOLEAN_TYPE))
4658 bool save = in_late_binary_op;
4659 if (codel == BOOLEAN_TYPE)
4660 in_late_binary_op = true;
4661 ret = convert_and_check (type, orig_rhs);
4662 if (codel == BOOLEAN_TYPE)
4663 in_late_binary_op = save;
4667 /* Aggregates in different TUs might need conversion. */
4668 if ((codel == RECORD_TYPE || codel == UNION_TYPE)
4670 && comptypes (type, rhstype))
4671 return convert_and_check (type, rhs);
4673 /* Conversion to a transparent union from its member types.
4674 This applies only to function arguments. */
4675 if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)
4676 && errtype == ic_argpass)
4678 tree memb, marginal_memb = NULL_TREE;
4680 for (memb = TYPE_FIELDS (type); memb ; memb = TREE_CHAIN (memb))
4682 tree memb_type = TREE_TYPE (memb);
4684 if (comptypes (TYPE_MAIN_VARIANT (memb_type),
4685 TYPE_MAIN_VARIANT (rhstype)))
4688 if (TREE_CODE (memb_type) != POINTER_TYPE)
4691 if (coder == POINTER_TYPE)
4693 tree ttl = TREE_TYPE (memb_type);
4694 tree ttr = TREE_TYPE (rhstype);
4696 /* Any non-function converts to a [const][volatile] void *
4697 and vice versa; otherwise, targets must be the same.
4698 Meanwhile, the lhs target must have all the qualifiers of
4700 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4701 || comp_target_types (memb_type, rhstype))
4703 /* If this type won't generate any warnings, use it. */
4704 if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr)
4705 || ((TREE_CODE (ttr) == FUNCTION_TYPE
4706 && TREE_CODE (ttl) == FUNCTION_TYPE)
4707 ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
4708 == TYPE_QUALS (ttr))
4709 : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
4710 == TYPE_QUALS (ttl))))
4713 /* Keep looking for a better type, but remember this one. */
4715 marginal_memb = memb;
4719 /* Can convert integer zero to any pointer type. */
4720 if (null_pointer_constant)
4722 rhs = null_pointer_node;
4727 if (memb || marginal_memb)
4731 /* We have only a marginally acceptable member type;
4732 it needs a warning. */
4733 tree ttl = TREE_TYPE (TREE_TYPE (marginal_memb));
4734 tree ttr = TREE_TYPE (rhstype);
4736 /* Const and volatile mean something different for function
4737 types, so the usual warnings are not appropriate. */
4738 if (TREE_CODE (ttr) == FUNCTION_TYPE
4739 && TREE_CODE (ttl) == FUNCTION_TYPE)
4741 /* Because const and volatile on functions are
4742 restrictions that say the function will not do
4743 certain things, it is okay to use a const or volatile
4744 function where an ordinary one is wanted, but not
4746 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
4747 WARN_FOR_ASSIGNMENT (input_location, 0,
4748 G_("passing argument %d of %qE "
4749 "makes qualified function "
4750 "pointer from unqualified"),
4751 G_("assignment makes qualified "
4752 "function pointer from "
4754 G_("initialization makes qualified "
4755 "function pointer from "
4757 G_("return makes qualified function "
4758 "pointer from unqualified"));
4760 else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
4761 WARN_FOR_ASSIGNMENT (input_location, 0,
4762 G_("passing argument %d of %qE discards "
4763 "qualifiers from pointer target type"),
4764 G_("assignment discards qualifiers "
4765 "from pointer target type"),
4766 G_("initialization discards qualifiers "
4767 "from pointer target type"),
4768 G_("return discards qualifiers from "
4769 "pointer target type"));
4771 memb = marginal_memb;
4774 if (!fundecl || !DECL_IN_SYSTEM_HEADER (fundecl))
4775 pedwarn (input_location, OPT_pedantic,
4776 "ISO C prohibits argument conversion to union type");
4778 rhs = fold_convert (TREE_TYPE (memb), rhs);
4779 return build_constructor_single (type, memb, rhs);
4783 /* Conversions among pointers */
4784 else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
4785 && (coder == codel))
4787 tree ttl = TREE_TYPE (type);
4788 tree ttr = TREE_TYPE (rhstype);
4791 bool is_opaque_pointer;
4792 int target_cmp = 0; /* Cache comp_target_types () result. */
4794 if (TREE_CODE (mvl) != ARRAY_TYPE)
4795 mvl = TYPE_MAIN_VARIANT (mvl);
4796 if (TREE_CODE (mvr) != ARRAY_TYPE)
4797 mvr = TYPE_MAIN_VARIANT (mvr);
4798 /* Opaque pointers are treated like void pointers. */
4799 is_opaque_pointer = vector_targets_convertible_p (ttl, ttr);
4801 /* C++ does not allow the implicit conversion void* -> T*. However,
4802 for the purpose of reducing the number of false positives, we
4803 tolerate the special case of
4807 where NULL is typically defined in C to be '(void *) 0'. */
4808 if (VOID_TYPE_P (ttr) && rhs != null_pointer_node && !VOID_TYPE_P (ttl))
4809 warning (OPT_Wc___compat, "request for implicit conversion from "
4810 "%qT to %qT not permitted in C++", rhstype, type);
4812 /* Check if the right-hand side has a format attribute but the
4813 left-hand side doesn't. */
4814 if (warn_missing_format_attribute
4815 && check_missing_format_attribute (type, rhstype))
4820 warning (OPT_Wmissing_format_attribute,
4821 "argument %d of %qE might be "
4822 "a candidate for a format attribute",
4826 warning (OPT_Wmissing_format_attribute,
4827 "assignment left-hand side might be "
4828 "a candidate for a format attribute");
4831 warning (OPT_Wmissing_format_attribute,
4832 "initialization left-hand side might be "
4833 "a candidate for a format attribute");
4836 warning (OPT_Wmissing_format_attribute,
4837 "return type might be "
4838 "a candidate for a format attribute");
4845 /* Any non-function converts to a [const][volatile] void *
4846 and vice versa; otherwise, targets must be the same.
4847 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
4848 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4849 || (target_cmp = comp_target_types (type, rhstype))
4850 || is_opaque_pointer
4851 || (c_common_unsigned_type (mvl)
4852 == c_common_unsigned_type (mvr)))
4855 && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE)
4858 && !null_pointer_constant
4859 && TREE_CODE (ttl) == FUNCTION_TYPE)))
4860 WARN_FOR_ASSIGNMENT (input_location, OPT_pedantic,
4861 G_("ISO C forbids passing argument %d of "
4862 "%qE between function pointer "
4864 G_("ISO C forbids assignment between "
4865 "function pointer and %<void *%>"),
4866 G_("ISO C forbids initialization between "
4867 "function pointer and %<void *%>"),
4868 G_("ISO C forbids return between function "
4869 "pointer and %<void *%>"));
4870 /* Const and volatile mean something different for function types,
4871 so the usual warnings are not appropriate. */
4872 else if (TREE_CODE (ttr) != FUNCTION_TYPE
4873 && TREE_CODE (ttl) != FUNCTION_TYPE)
4875 if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
4877 /* Types differing only by the presence of the 'volatile'
4878 qualifier are acceptable if the 'volatile' has been added
4879 in by the Objective-C EH machinery. */
4880 if (!objc_type_quals_match (ttl, ttr))
4881 WARN_FOR_ASSIGNMENT (input_location, 0,
4882 G_("passing argument %d of %qE discards "
4883 "qualifiers from pointer target type"),
4884 G_("assignment discards qualifiers "
4885 "from pointer target type"),
4886 G_("initialization discards qualifiers "
4887 "from pointer target type"),
4888 G_("return discards qualifiers from "
4889 "pointer target type"));
4891 /* If this is not a case of ignoring a mismatch in signedness,
4893 else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4896 /* If there is a mismatch, do warn. */
4897 else if (warn_pointer_sign)
4898 WARN_FOR_ASSIGNMENT (input_location, OPT_Wpointer_sign,
4899 G_("pointer targets in passing argument "
4900 "%d of %qE differ in signedness"),
4901 G_("pointer targets in assignment "
4902 "differ in signedness"),
4903 G_("pointer targets in initialization "
4904 "differ in signedness"),
4905 G_("pointer targets in return differ "
4908 else if (TREE_CODE (ttl) == FUNCTION_TYPE
4909 && TREE_CODE (ttr) == FUNCTION_TYPE)
4911 /* Because const and volatile on functions are restrictions
4912 that say the function will not do certain things,
4913 it is okay to use a const or volatile function
4914 where an ordinary one is wanted, but not vice-versa. */
4915 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
4916 WARN_FOR_ASSIGNMENT (input_location, 0,
4917 G_("passing argument %d of %qE makes "
4918 "qualified function pointer "
4919 "from unqualified"),
4920 G_("assignment makes qualified function "
4921 "pointer from unqualified"),
4922 G_("initialization makes qualified "
4923 "function pointer from unqualified"),
4924 G_("return makes qualified function "
4925 "pointer from unqualified"));
4929 /* Avoid warning about the volatile ObjC EH puts on decls. */
4931 WARN_FOR_ASSIGNMENT (input_location, 0,
4932 G_("passing argument %d of %qE from "
4933 "incompatible pointer type"),
4934 G_("assignment from incompatible pointer type"),
4935 G_("initialization from incompatible "
4937 G_("return from incompatible pointer type"));
4939 return convert (type, rhs);
4941 else if (codel == POINTER_TYPE && coder == ARRAY_TYPE)
4943 /* ??? This should not be an error when inlining calls to
4944 unprototyped functions. */
4945 error ("invalid use of non-lvalue array");
4946 return error_mark_node;
4948 else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
4950 /* An explicit constant 0 can convert to a pointer,
4951 or one that results from arithmetic, even including
4952 a cast to integer type. */
4953 if (!null_pointer_constant)
4954 WARN_FOR_ASSIGNMENT (input_location, 0,
4955 G_("passing argument %d of %qE makes "
4956 "pointer from integer without a cast"),
4957 G_("assignment makes pointer from integer "
4959 G_("initialization makes pointer from "
4960 "integer without a cast"),
4961 G_("return makes pointer from integer "
4964 return convert (type, rhs);
4966 else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
4968 WARN_FOR_ASSIGNMENT (input_location, 0,
4969 G_("passing argument %d of %qE makes integer "
4970 "from pointer without a cast"),
4971 G_("assignment makes integer from pointer "
4973 G_("initialization makes integer from pointer "
4975 G_("return makes integer from pointer "
4977 return convert (type, rhs);
4979 else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE)
4982 bool save = in_late_binary_op;
4983 in_late_binary_op = true;
4984 ret = convert (type, rhs);
4985 in_late_binary_op = save;
4992 error ("incompatible type for argument %d of %qE", parmnum, rname);
4993 inform ((fundecl && !DECL_IS_BUILTIN (fundecl))
4994 ? DECL_SOURCE_LOCATION (fundecl) : input_location,
4995 "expected %qT but argument is of type %qT", type, rhstype);
4998 error ("incompatible types when assigning to type %qT from type %qT",
5002 error ("incompatible types when initializing type %qT using type %qT",
5006 error ("incompatible types when returning type %qT but %qT was expected",
5013 return error_mark_node;
5016 /* If VALUE is a compound expr all of whose expressions are constant, then
5017 return its value. Otherwise, return error_mark_node.
5019 This is for handling COMPOUND_EXPRs as initializer elements
5020 which is allowed with a warning when -pedantic is specified. */
5023 valid_compound_expr_initializer (tree value, tree endtype)
5025 if (TREE_CODE (value) == COMPOUND_EXPR)
5027 if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
5029 return error_mark_node;
5030 return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
5033 else if (!initializer_constant_valid_p (value, endtype))
5034 return error_mark_node;
5039 /* Perform appropriate conversions on the initial value of a variable,
5040 store it in the declaration DECL,
5041 and print any error messages that are appropriate.
5042 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
5043 If the init is invalid, store an ERROR_MARK. */
5046 store_init_value (tree decl, tree init, tree origtype)
5051 /* If variable's type was invalidly declared, just ignore it. */
5053 type = TREE_TYPE (decl);
5054 if (TREE_CODE (type) == ERROR_MARK)
5057 /* Digest the specified initializer into an expression. */
5060 npc = null_pointer_constant_p (init);
5061 value = digest_init (type, init, origtype, npc, true, TREE_STATIC (decl));
5063 /* Store the expression if valid; else report error. */
5065 if (!in_system_header
5066 && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && !TREE_STATIC (decl))
5067 warning (OPT_Wtraditional, "traditional C rejects automatic "
5068 "aggregate initialization");
5070 DECL_INITIAL (decl) = value;
5072 /* ANSI wants warnings about out-of-range constant initializers. */
5073 STRIP_TYPE_NOPS (value);
5074 if (TREE_STATIC (decl))
5075 constant_expression_warning (value);
5077 /* Check if we need to set array size from compound literal size. */
5078 if (TREE_CODE (type) == ARRAY_TYPE
5079 && TYPE_DOMAIN (type) == 0
5080 && value != error_mark_node)
5082 tree inside_init = init;
5084 STRIP_TYPE_NOPS (inside_init);
5085 inside_init = fold (inside_init);
5087 if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
5089 tree cldecl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
5091 if (TYPE_DOMAIN (TREE_TYPE (cldecl)))
5093 /* For int foo[] = (int [3]){1}; we need to set array size
5094 now since later on array initializer will be just the
5095 brace enclosed list of the compound literal. */
5096 type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
5097 TREE_TYPE (decl) = type;
5098 TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (cldecl));
5100 layout_decl (cldecl, 0);
5106 /* Methods for storing and printing names for error messages. */
5108 /* Implement a spelling stack that allows components of a name to be pushed
5109 and popped. Each element on the stack is this structure. */
5116 unsigned HOST_WIDE_INT i;
5121 #define SPELLING_STRING 1
5122 #define SPELLING_MEMBER 2
5123 #define SPELLING_BOUNDS 3
5125 static struct spelling *spelling; /* Next stack element (unused). */
5126 static struct spelling *spelling_base; /* Spelling stack base. */
5127 static int spelling_size; /* Size of the spelling stack. */
5129 /* Macros to save and restore the spelling stack around push_... functions.
5130 Alternative to SAVE_SPELLING_STACK. */
5132 #define SPELLING_DEPTH() (spelling - spelling_base)
5133 #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH))
5135 /* Push an element on the spelling stack with type KIND and assign VALUE
5138 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
5140 int depth = SPELLING_DEPTH (); \
5142 if (depth >= spelling_size) \
5144 spelling_size += 10; \
5145 spelling_base = XRESIZEVEC (struct spelling, spelling_base, \
5147 RESTORE_SPELLING_DEPTH (depth); \
5150 spelling->kind = (KIND); \
5151 spelling->MEMBER = (VALUE); \
5155 /* Push STRING on the stack. Printed literally. */
5158 push_string (const char *string)
5160 PUSH_SPELLING (SPELLING_STRING, string, u.s);
5163 /* Push a member name on the stack. Printed as '.' STRING. */
5166 push_member_name (tree decl)
5168 const char *const string
5170 ? identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl)))
5171 : _("<anonymous>"));
5172 PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
5175 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
5178 push_array_bounds (unsigned HOST_WIDE_INT bounds)
5180 PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
5183 /* Compute the maximum size in bytes of the printed spelling. */
5186 spelling_length (void)
5191 for (p = spelling_base; p < spelling; p++)
5193 if (p->kind == SPELLING_BOUNDS)
5196 size += strlen (p->u.s) + 1;
5202 /* Print the spelling to BUFFER and return it. */
5205 print_spelling (char *buffer)
5210 for (p = spelling_base; p < spelling; p++)
5211 if (p->kind == SPELLING_BOUNDS)
5213 sprintf (d, "[" HOST_WIDE_INT_PRINT_UNSIGNED "]", p->u.i);
5219 if (p->kind == SPELLING_MEMBER)
5221 for (s = p->u.s; (*d = *s++); d++)
5228 /* Issue an error message for a bad initializer component.
5229 MSGID identifies the message.
5230 The component name is taken from the spelling stack. */
5233 error_init (const char *msgid)
5237 error ("%s", _(msgid));
5238 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
5240 error ("(near initialization for %qs)", ofwhat);
5243 /* Issue a pedantic warning for a bad initializer component. OPT is
5244 the option OPT_* (from options.h) controlling this warning or 0 if
5245 it is unconditionally given. MSGID identifies the message. The
5246 component name is taken from the spelling stack. */
5249 pedwarn_init (location_t location, int opt, const char *msgid)
5253 pedwarn (location, opt, "%s", _(msgid));
5254 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
5256 pedwarn (location, opt, "(near initialization for %qs)", ofwhat);
5259 /* Issue a warning for a bad initializer component.
5261 OPT is the OPT_W* value corresponding to the warning option that
5262 controls this warning. MSGID identifies the message. The
5263 component name is taken from the spelling stack. */
5266 warning_init (int opt, const char *msgid)
5270 warning (opt, "%s", _(msgid));
5271 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
5273 warning (opt, "(near initialization for %qs)", ofwhat);
5276 /* If TYPE is an array type and EXPR is a parenthesized string
5277 constant, warn if pedantic that EXPR is being used to initialize an
5278 object of type TYPE. */
5281 maybe_warn_string_init (tree type, struct c_expr expr)
5284 && TREE_CODE (type) == ARRAY_TYPE
5285 && TREE_CODE (expr.value) == STRING_CST
5286 && expr.original_code != STRING_CST)
5287 pedwarn_init (input_location, OPT_pedantic,
5288 "array initialized from parenthesized string constant");
5291 /* Digest the parser output INIT as an initializer for type TYPE.
5292 Return a C expression of type TYPE to represent the initial value.
5294 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
5296 NULL_POINTER_CONSTANT is true if INIT is a null pointer constant.
5298 If INIT is a string constant, STRICT_STRING is true if it is
5299 unparenthesized or we should not warn here for it being parenthesized.
5300 For other types of INIT, STRICT_STRING is not used.
5302 REQUIRE_CONSTANT requests an error if non-constant initializers or
5303 elements are seen. */
5306 digest_init (tree type, tree init, tree origtype, bool null_pointer_constant,
5307 bool strict_string, int require_constant)
5309 enum tree_code code = TREE_CODE (type);
5310 tree inside_init = init;
5311 tree semantic_type = NULL_TREE;
5312 bool maybe_const = true;
5314 if (type == error_mark_node
5316 || init == error_mark_node
5317 || TREE_TYPE (init) == error_mark_node)
5318 return error_mark_node;
5320 STRIP_TYPE_NOPS (inside_init);
5322 if (TREE_CODE (inside_init) == EXCESS_PRECISION_EXPR)
5324 semantic_type = TREE_TYPE (inside_init);
5325 inside_init = TREE_OPERAND (inside_init, 0);
5327 inside_init = c_fully_fold (inside_init, require_constant, &maybe_const);
5328 inside_init = decl_constant_value_for_optimization (inside_init);
5330 /* Initialization of an array of chars from a string constant
5331 optionally enclosed in braces. */
5333 if (code == ARRAY_TYPE && inside_init
5334 && TREE_CODE (inside_init) == STRING_CST)
5336 tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
5337 /* Note that an array could be both an array of character type
5338 and an array of wchar_t if wchar_t is signed char or unsigned
5340 bool char_array = (typ1 == char_type_node
5341 || typ1 == signed_char_type_node
5342 || typ1 == unsigned_char_type_node);
5343 bool wchar_array = !!comptypes (typ1, wchar_type_node);
5344 bool char16_array = !!comptypes (typ1, char16_type_node);
5345 bool char32_array = !!comptypes (typ1, char32_type_node);
5347 if (char_array || wchar_array || char16_array || char32_array)
5350 tree typ2 = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)));
5351 expr.value = inside_init;
5352 expr.original_code = (strict_string ? STRING_CST : ERROR_MARK);
5353 expr.original_type = NULL;
5354 maybe_warn_string_init (type, expr);
5356 if (TYPE_DOMAIN (type) && !TYPE_MAX_VALUE (TYPE_DOMAIN (type)))
5357 pedwarn_init (input_location, OPT_pedantic,
5358 "initialization of a flexible array member");
5360 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
5361 TYPE_MAIN_VARIANT (type)))
5366 if (typ2 != char_type_node)
5368 error_init ("char-array initialized from wide string");
5369 return error_mark_node;
5374 if (typ2 == char_type_node)
5376 error_init ("wide character array initialized from non-wide "
5378 return error_mark_node;
5380 else if (!comptypes(typ1, typ2))
5382 error_init ("wide character array initialized from "
5383 "incompatible wide string");
5384 return error_mark_node;
5388 TREE_TYPE (inside_init) = type;
5389 if (TYPE_DOMAIN (type) != 0
5390 && TYPE_SIZE (type) != 0
5391 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
5392 /* Subtract the size of a single (possibly wide) character
5393 because it's ok to ignore the terminating null char
5394 that is counted in the length of the constant. */
5395 && 0 > compare_tree_int (TYPE_SIZE_UNIT (type),
5396 TREE_STRING_LENGTH (inside_init)
5397 - (TYPE_PRECISION (typ1)
5399 pedwarn_init (input_location, 0,
5400 "initializer-string for array of chars is too long");
5404 else if (INTEGRAL_TYPE_P (typ1))
5406 error_init ("array of inappropriate type initialized "
5407 "from string constant");
5408 return error_mark_node;
5412 /* Build a VECTOR_CST from a *constant* vector constructor. If the
5413 vector constructor is not constant (e.g. {1,2,3,foo()}) then punt
5414 below and handle as a constructor. */
5415 if (code == VECTOR_TYPE
5416 && TREE_CODE (TREE_TYPE (inside_init)) == VECTOR_TYPE
5417 && vector_types_convertible_p (TREE_TYPE (inside_init), type, true)
5418 && TREE_CONSTANT (inside_init))
5420 if (TREE_CODE (inside_init) == VECTOR_CST
5421 && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
5422 TYPE_MAIN_VARIANT (type)))
5425 if (TREE_CODE (inside_init) == CONSTRUCTOR)
5427 unsigned HOST_WIDE_INT ix;
5429 bool constant_p = true;
5431 /* Iterate through elements and check if all constructor
5432 elements are *_CSTs. */
5433 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (inside_init), ix, value)
5434 if (!CONSTANT_CLASS_P (value))
5441 return build_vector_from_ctor (type,
5442 CONSTRUCTOR_ELTS (inside_init));
5446 if (warn_sequence_point)
5447 verify_sequence_points (inside_init);
5449 /* Any type can be initialized
5450 from an expression of the same type, optionally with braces. */
5452 if (inside_init && TREE_TYPE (inside_init) != 0
5453 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
5454 TYPE_MAIN_VARIANT (type))
5455 || (code == ARRAY_TYPE
5456 && comptypes (TREE_TYPE (inside_init), type))
5457 || (code == VECTOR_TYPE
5458 && comptypes (TREE_TYPE (inside_init), type))
5459 || (code == POINTER_TYPE
5460 && TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
5461 && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
5462 TREE_TYPE (type)))))
5464 if (code == POINTER_TYPE)
5466 if (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE)
5468 if (TREE_CODE (inside_init) == STRING_CST
5469 || TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
5470 inside_init = array_to_pointer_conversion (inside_init);
5473 error_init ("invalid use of non-lvalue array");
5474 return error_mark_node;
5479 if (code == VECTOR_TYPE)
5480 /* Although the types are compatible, we may require a
5482 inside_init = convert (type, inside_init);
5484 if (require_constant
5485 && (code == VECTOR_TYPE || !flag_isoc99)
5486 && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR)
5488 /* As an extension, allow initializing objects with static storage
5489 duration with compound literals (which are then treated just as
5490 the brace enclosed list they contain). Also allow this for
5491 vectors, as we can only assign them with compound literals. */
5492 tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init);
5493 inside_init = DECL_INITIAL (decl);
5496 if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
5497 && TREE_CODE (inside_init) != CONSTRUCTOR)
5499 error_init ("array initialized from non-constant array expression");
5500 return error_mark_node;
5503 /* Compound expressions can only occur here if -pedantic or
5504 -pedantic-errors is specified. In the later case, we always want
5505 an error. In the former case, we simply want a warning. */
5506 if (require_constant && pedantic
5507 && TREE_CODE (inside_init) == COMPOUND_EXPR)
5510 = valid_compound_expr_initializer (inside_init,
5511 TREE_TYPE (inside_init));
5512 if (inside_init == error_mark_node)
5513 error_init ("initializer element is not constant");
5515 pedwarn_init (input_location, OPT_pedantic,
5516 "initializer element is not constant");
5517 if (flag_pedantic_errors)
5518 inside_init = error_mark_node;
5520 else if (require_constant
5521 && !initializer_constant_valid_p (inside_init,
5522 TREE_TYPE (inside_init)))
5524 error_init ("initializer element is not constant");
5525 inside_init = error_mark_node;
5527 else if (require_constant && !maybe_const)
5528 pedwarn_init (input_location, 0,
5529 "initializer element is not a constant expression");
5531 /* Added to enable additional -Wmissing-format-attribute warnings. */
5532 if (TREE_CODE (TREE_TYPE (inside_init)) == POINTER_TYPE)
5533 inside_init = convert_for_assignment (type, inside_init, origtype,
5534 ic_init, null_pointer_constant,
5535 NULL_TREE, NULL_TREE, 0);
5539 /* Handle scalar types, including conversions. */
5541 if (code == INTEGER_TYPE || code == REAL_TYPE || code == FIXED_POINT_TYPE
5542 || code == POINTER_TYPE || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE
5543 || code == COMPLEX_TYPE || code == VECTOR_TYPE)
5545 if (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE
5546 && (TREE_CODE (init) == STRING_CST
5547 || TREE_CODE (init) == COMPOUND_LITERAL_EXPR))
5548 inside_init = init = array_to_pointer_conversion (init);
5550 inside_init = build1 (EXCESS_PRECISION_EXPR, semantic_type,
5553 = convert_for_assignment (type, inside_init, origtype, ic_init,
5554 null_pointer_constant,
5555 NULL_TREE, NULL_TREE, 0);
5557 /* Check to see if we have already given an error message. */
5558 if (inside_init == error_mark_node)
5560 else if (require_constant && !TREE_CONSTANT (inside_init))
5562 error_init ("initializer element is not constant");
5563 inside_init = error_mark_node;
5565 else if (require_constant
5566 && !initializer_constant_valid_p (inside_init,
5567 TREE_TYPE (inside_init)))
5569 error_init ("initializer element is not computable at load time");
5570 inside_init = error_mark_node;
5572 else if (require_constant && !maybe_const)
5573 pedwarn_init (input_location, 0,
5574 "initializer element is not a constant expression");
5579 /* Come here only for records and arrays. */
5581 if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
5583 error_init ("variable-sized object may not be initialized");
5584 return error_mark_node;
5587 error_init ("invalid initializer");
5588 return error_mark_node;
5591 /* Handle initializers that use braces. */
5593 /* Type of object we are accumulating a constructor for.
5594 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
5595 static tree constructor_type;
5597 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
5599 static tree constructor_fields;
5601 /* For an ARRAY_TYPE, this is the specified index
5602 at which to store the next element we get. */
5603 static tree constructor_index;
5605 /* For an ARRAY_TYPE, this is the maximum index. */
5606 static tree constructor_max_index;
5608 /* For a RECORD_TYPE, this is the first field not yet written out. */
5609 static tree constructor_unfilled_fields;
5611 /* For an ARRAY_TYPE, this is the index of the first element
5612 not yet written out. */
5613 static tree constructor_unfilled_index;
5615 /* In a RECORD_TYPE, the byte index of the next consecutive field.
5616 This is so we can generate gaps between fields, when appropriate. */
5617 static tree constructor_bit_index;
5619 /* If we are saving up the elements rather than allocating them,
5620 this is the list of elements so far (in reverse order,
5621 most recent first). */
5622 static VEC(constructor_elt,gc) *constructor_elements;
5624 /* 1 if constructor should be incrementally stored into a constructor chain,
5625 0 if all the elements should be kept in AVL tree. */
5626 static int constructor_incremental;
5628 /* 1 if so far this constructor's elements are all compile-time constants. */
5629 static int constructor_constant;
5631 /* 1 if so far this constructor's elements are all valid address constants. */
5632 static int constructor_simple;
5634 /* 1 if this constructor has an element that cannot be part of a
5635 constant expression. */
5636 static int constructor_nonconst;
5638 /* 1 if this constructor is erroneous so far. */
5639 static int constructor_erroneous;
5641 /* Structure for managing pending initializer elements, organized as an
5646 struct init_node *left, *right;
5647 struct init_node *parent;
5654 /* Tree of pending elements at this constructor level.
5655 These are elements encountered out of order
5656 which belong at places we haven't reached yet in actually
5658 Will never hold tree nodes across GC runs. */
5659 static struct init_node *constructor_pending_elts;
5661 /* The SPELLING_DEPTH of this constructor. */
5662 static int constructor_depth;
5664 /* DECL node for which an initializer is being read.
5665 0 means we are reading a constructor expression
5666 such as (struct foo) {...}. */
5667 static tree constructor_decl;
5669 /* Nonzero if this is an initializer for a top-level decl. */
5670 static int constructor_top_level;
5672 /* Nonzero if there were any member designators in this initializer. */
5673 static int constructor_designated;
5675 /* Nesting depth of designator list. */
5676 static int designator_depth;
5678 /* Nonzero if there were diagnosed errors in this designator list. */
5679 static int designator_erroneous;
5682 /* This stack has a level for each implicit or explicit level of
5683 structuring in the initializer, including the outermost one. It
5684 saves the values of most of the variables above. */
5686 struct constructor_range_stack;
5688 struct constructor_stack
5690 struct constructor_stack *next;
5695 tree unfilled_index;
5696 tree unfilled_fields;
5698 VEC(constructor_elt,gc) *elements;
5699 struct init_node *pending_elts;
5702 /* If value nonzero, this value should replace the entire
5703 constructor at this level. */
5704 struct c_expr replacement_value;
5705 struct constructor_range_stack *range_stack;
5716 static struct constructor_stack *constructor_stack;
5718 /* This stack represents designators from some range designator up to
5719 the last designator in the list. */
5721 struct constructor_range_stack
5723 struct constructor_range_stack *next, *prev;
5724 struct constructor_stack *stack;
5731 static struct constructor_range_stack *constructor_range_stack;
5733 /* This stack records separate initializers that are nested.
5734 Nested initializers can't happen in ANSI C, but GNU C allows them
5735 in cases like { ... (struct foo) { ... } ... }. */
5737 struct initializer_stack
5739 struct initializer_stack *next;
5741 struct constructor_stack *constructor_stack;
5742 struct constructor_range_stack *constructor_range_stack;
5743 VEC(constructor_elt,gc) *elements;
5744 struct spelling *spelling;
5745 struct spelling *spelling_base;
5748 char require_constant_value;
5749 char require_constant_elements;
5752 static struct initializer_stack *initializer_stack;
5754 /* Prepare to parse and output the initializer for variable DECL. */
5757 start_init (tree decl, tree asmspec_tree ATTRIBUTE_UNUSED, int top_level)
5760 struct initializer_stack *p = XNEW (struct initializer_stack);
5762 p->decl = constructor_decl;
5763 p->require_constant_value = require_constant_value;
5764 p->require_constant_elements = require_constant_elements;
5765 p->constructor_stack = constructor_stack;
5766 p->constructor_range_stack = constructor_range_stack;
5767 p->elements = constructor_elements;
5768 p->spelling = spelling;
5769 p->spelling_base = spelling_base;
5770 p->spelling_size = spelling_size;
5771 p->top_level = constructor_top_level;
5772 p->next = initializer_stack;
5773 initializer_stack = p;
5775 constructor_decl = decl;
5776 constructor_designated = 0;
5777 constructor_top_level = top_level;
5779 if (decl != 0 && decl != error_mark_node)
5781 require_constant_value = TREE_STATIC (decl);
5782 require_constant_elements
5783 = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99))
5784 /* For a scalar, you can always use any value to initialize,
5785 even within braces. */
5786 && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
5787 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5788 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
5789 || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
5790 locus = identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl)));
5794 require_constant_value = 0;
5795 require_constant_elements = 0;
5796 locus = _("(anonymous)");
5799 constructor_stack = 0;
5800 constructor_range_stack = 0;
5802 missing_braces_mentioned = 0;
5806 RESTORE_SPELLING_DEPTH (0);
5809 push_string (locus);
5815 struct initializer_stack *p = initializer_stack;
5817 /* Free the whole constructor stack of this initializer. */
5818 while (constructor_stack)
5820 struct constructor_stack *q = constructor_stack;
5821 constructor_stack = q->next;
5825 gcc_assert (!constructor_range_stack);
5827 /* Pop back to the data of the outer initializer (if any). */
5828 free (spelling_base);
5830 constructor_decl = p->decl;
5831 require_constant_value = p->require_constant_value;
5832 require_constant_elements = p->require_constant_elements;
5833 constructor_stack = p->constructor_stack;
5834 constructor_range_stack = p->constructor_range_stack;
5835 constructor_elements = p->elements;
5836 spelling = p->spelling;
5837 spelling_base = p->spelling_base;
5838 spelling_size = p->spelling_size;
5839 constructor_top_level = p->top_level;
5840 initializer_stack = p->next;
5844 /* Call here when we see the initializer is surrounded by braces.
5845 This is instead of a call to push_init_level;
5846 it is matched by a call to pop_init_level.
5848 TYPE is the type to initialize, for a constructor expression.
5849 For an initializer for a decl, TYPE is zero. */
5852 really_start_incremental_init (tree type)
5854 struct constructor_stack *p = XNEW (struct constructor_stack);
5857 type = TREE_TYPE (constructor_decl);
5859 if (TREE_CODE (type) == VECTOR_TYPE
5860 && TYPE_VECTOR_OPAQUE (type))
5861 error ("opaque vector types cannot be initialized");
5863 p->type = constructor_type;
5864 p->fields = constructor_fields;
5865 p->index = constructor_index;
5866 p->max_index = constructor_max_index;
5867 p->unfilled_index = constructor_unfilled_index;
5868 p->unfilled_fields = constructor_unfilled_fields;
5869 p->bit_index = constructor_bit_index;
5870 p->elements = constructor_elements;
5871 p->constant = constructor_constant;
5872 p->simple = constructor_simple;
5873 p->nonconst = constructor_nonconst;
5874 p->erroneous = constructor_erroneous;
5875 p->pending_elts = constructor_pending_elts;
5876 p->depth = constructor_depth;
5877 p->replacement_value.value = 0;
5878 p->replacement_value.original_code = ERROR_MARK;
5879 p->replacement_value.original_type = NULL;
5883 p->incremental = constructor_incremental;
5884 p->designated = constructor_designated;
5886 constructor_stack = p;
5888 constructor_constant = 1;
5889 constructor_simple = 1;
5890 constructor_nonconst = 0;
5891 constructor_depth = SPELLING_DEPTH ();
5892 constructor_elements = 0;
5893 constructor_pending_elts = 0;
5894 constructor_type = type;
5895 constructor_incremental = 1;
5896 constructor_designated = 0;
5897 designator_depth = 0;
5898 designator_erroneous = 0;
5900 if (TREE_CODE (constructor_type) == RECORD_TYPE
5901 || TREE_CODE (constructor_type) == UNION_TYPE)
5903 constructor_fields = TYPE_FIELDS (constructor_type);
5904 /* Skip any nameless bit fields at the beginning. */
5905 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5906 && DECL_NAME (constructor_fields) == 0)
5907 constructor_fields = TREE_CHAIN (constructor_fields);
5909 constructor_unfilled_fields = constructor_fields;
5910 constructor_bit_index = bitsize_zero_node;
5912 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5914 if (TYPE_DOMAIN (constructor_type))
5916 constructor_max_index
5917 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5919 /* Detect non-empty initializations of zero-length arrays. */
5920 if (constructor_max_index == NULL_TREE
5921 && TYPE_SIZE (constructor_type))
5922 constructor_max_index = build_int_cst (NULL_TREE, -1);
5924 /* constructor_max_index needs to be an INTEGER_CST. Attempts
5925 to initialize VLAs will cause a proper error; avoid tree
5926 checking errors as well by setting a safe value. */
5927 if (constructor_max_index
5928 && TREE_CODE (constructor_max_index) != INTEGER_CST)
5929 constructor_max_index = build_int_cst (NULL_TREE, -1);
5932 = convert (bitsizetype,
5933 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5937 constructor_index = bitsize_zero_node;
5938 constructor_max_index = NULL_TREE;
5941 constructor_unfilled_index = constructor_index;
5943 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
5945 /* Vectors are like simple fixed-size arrays. */
5946 constructor_max_index =
5947 build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1);
5948 constructor_index = bitsize_zero_node;
5949 constructor_unfilled_index = constructor_index;
5953 /* Handle the case of int x = {5}; */
5954 constructor_fields = constructor_type;
5955 constructor_unfilled_fields = constructor_type;
5959 /* Push down into a subobject, for initialization.
5960 If this is for an explicit set of braces, IMPLICIT is 0.
5961 If it is because the next element belongs at a lower level,
5962 IMPLICIT is 1 (or 2 if the push is because of designator list). */
5965 push_init_level (int implicit)
5967 struct constructor_stack *p;
5968 tree value = NULL_TREE;
5970 /* If we've exhausted any levels that didn't have braces,
5971 pop them now. If implicit == 1, this will have been done in
5972 process_init_element; do not repeat it here because in the case
5973 of excess initializers for an empty aggregate this leads to an
5974 infinite cycle of popping a level and immediately recreating
5978 while (constructor_stack->implicit)
5980 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5981 || TREE_CODE (constructor_type) == UNION_TYPE)
5982 && constructor_fields == 0)
5983 process_init_element (pop_init_level (1), true);
5984 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
5985 && constructor_max_index
5986 && tree_int_cst_lt (constructor_max_index,
5988 process_init_element (pop_init_level (1), true);
5994 /* Unless this is an explicit brace, we need to preserve previous
5998 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5999 || TREE_CODE (constructor_type) == UNION_TYPE)
6000 && constructor_fields)
6001 value = find_init_member (constructor_fields);
6002 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6003 value = find_init_member (constructor_index);
6006 p = XNEW (struct constructor_stack);
6007 p->type = constructor_type;
6008 p->fields = constructor_fields;
6009 p->index = constructor_index;
6010 p->max_index = constructor_max_index;
6011 p->unfilled_index = constructor_unfilled_index;
6012 p->unfilled_fields = constructor_unfilled_fields;
6013 p->bit_index = constructor_bit_index;
6014 p->elements = constructor_elements;
6015 p->constant = constructor_constant;
6016 p->simple = constructor_simple;
6017 p->nonconst = constructor_nonconst;
6018 p->erroneous = constructor_erroneous;
6019 p->pending_elts = constructor_pending_elts;
6020 p->depth = constructor_depth;
6021 p->replacement_value.value = 0;
6022 p->replacement_value.original_code = ERROR_MARK;
6023 p->replacement_value.original_type = NULL;
6024 p->implicit = implicit;
6026 p->incremental = constructor_incremental;
6027 p->designated = constructor_designated;
6028 p->next = constructor_stack;
6030 constructor_stack = p;
6032 constructor_constant = 1;
6033 constructor_simple = 1;
6034 constructor_nonconst = 0;
6035 constructor_depth = SPELLING_DEPTH ();
6036 constructor_elements = 0;
6037 constructor_incremental = 1;
6038 constructor_designated = 0;
6039 constructor_pending_elts = 0;
6042 p->range_stack = constructor_range_stack;
6043 constructor_range_stack = 0;
6044 designator_depth = 0;
6045 designator_erroneous = 0;
6048 /* Don't die if an entire brace-pair level is superfluous
6049 in the containing level. */
6050 if (constructor_type == 0)
6052 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6053 || TREE_CODE (constructor_type) == UNION_TYPE)
6055 /* Don't die if there are extra init elts at the end. */
6056 if (constructor_fields == 0)
6057 constructor_type = 0;
6060 constructor_type = TREE_TYPE (constructor_fields);
6061 push_member_name (constructor_fields);
6062 constructor_depth++;
6065 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6067 constructor_type = TREE_TYPE (constructor_type);
6068 push_array_bounds (tree_low_cst (constructor_index, 1));
6069 constructor_depth++;
6072 if (constructor_type == 0)
6074 error_init ("extra brace group at end of initializer");
6075 constructor_fields = 0;
6076 constructor_unfilled_fields = 0;
6080 if (value && TREE_CODE (value) == CONSTRUCTOR)
6082 constructor_constant = TREE_CONSTANT (value);
6083 constructor_simple = TREE_STATIC (value);
6084 constructor_nonconst = CONSTRUCTOR_NON_CONST (value);
6085 constructor_elements = CONSTRUCTOR_ELTS (value);
6086 if (!VEC_empty (constructor_elt, constructor_elements)
6087 && (TREE_CODE (constructor_type) == RECORD_TYPE
6088 || TREE_CODE (constructor_type) == ARRAY_TYPE))
6089 set_nonincremental_init ();
6092 if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned)
6094 missing_braces_mentioned = 1;
6095 warning_init (OPT_Wmissing_braces, "missing braces around initializer");
6098 if (TREE_CODE (constructor_type) == RECORD_TYPE
6099 || TREE_CODE (constructor_type) == UNION_TYPE)
6101 constructor_fields = TYPE_FIELDS (constructor_type);
6102 /* Skip any nameless bit fields at the beginning. */
6103 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
6104 && DECL_NAME (constructor_fields) == 0)
6105 constructor_fields = TREE_CHAIN (constructor_fields);
6107 constructor_unfilled_fields = constructor_fields;
6108 constructor_bit_index = bitsize_zero_node;
6110 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
6112 /* Vectors are like simple fixed-size arrays. */
6113 constructor_max_index =
6114 build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1);
6115 constructor_index = convert (bitsizetype, integer_zero_node);
6116 constructor_unfilled_index = constructor_index;
6118 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6120 if (TYPE_DOMAIN (constructor_type))
6122 constructor_max_index
6123 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
6125 /* Detect non-empty initializations of zero-length arrays. */
6126 if (constructor_max_index == NULL_TREE
6127 && TYPE_SIZE (constructor_type))
6128 constructor_max_index = build_int_cst (NULL_TREE, -1);
6130 /* constructor_max_index needs to be an INTEGER_CST. Attempts
6131 to initialize VLAs will cause a proper error; avoid tree
6132 checking errors as well by setting a safe value. */
6133 if (constructor_max_index
6134 && TREE_CODE (constructor_max_index) != INTEGER_CST)
6135 constructor_max_index = build_int_cst (NULL_TREE, -1);
6138 = convert (bitsizetype,
6139 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
6142 constructor_index = bitsize_zero_node;
6144 constructor_unfilled_index = constructor_index;
6145 if (value && TREE_CODE (value) == STRING_CST)
6147 /* We need to split the char/wchar array into individual
6148 characters, so that we don't have to special case it
6150 set_nonincremental_init_from_string (value);
6155 if (constructor_type != error_mark_node)
6156 warning_init (0, "braces around scalar initializer");
6157 constructor_fields = constructor_type;
6158 constructor_unfilled_fields = constructor_type;
6162 /* At the end of an implicit or explicit brace level,
6163 finish up that level of constructor. If a single expression
6164 with redundant braces initialized that level, return the
6165 c_expr structure for that expression. Otherwise, the original_code
6166 element is set to ERROR_MARK.
6167 If we were outputting the elements as they are read, return 0 as the value
6168 from inner levels (process_init_element ignores that),
6169 but return error_mark_node as the value from the outermost level
6170 (that's what we want to put in DECL_INITIAL).
6171 Otherwise, return a CONSTRUCTOR expression as the value. */
6174 pop_init_level (int implicit)
6176 struct constructor_stack *p;
6179 ret.original_code = ERROR_MARK;
6180 ret.original_type = NULL;
6184 /* When we come to an explicit close brace,
6185 pop any inner levels that didn't have explicit braces. */
6186 while (constructor_stack->implicit)
6187 process_init_element (pop_init_level (1), true);
6189 gcc_assert (!constructor_range_stack);
6192 /* Now output all pending elements. */
6193 constructor_incremental = 1;
6194 output_pending_init_elements (1);
6196 p = constructor_stack;
6198 /* Error for initializing a flexible array member, or a zero-length
6199 array member in an inappropriate context. */
6200 if (constructor_type && constructor_fields
6201 && TREE_CODE (constructor_type) == ARRAY_TYPE
6202 && TYPE_DOMAIN (constructor_type)
6203 && !TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
6205 /* Silently discard empty initializations. The parser will
6206 already have pedwarned for empty brackets. */
6207 if (integer_zerop (constructor_unfilled_index))
6208 constructor_type = NULL_TREE;
6211 gcc_assert (!TYPE_SIZE (constructor_type));
6213 if (constructor_depth > 2)
6214 error_init ("initialization of flexible array member in a nested context");
6216 pedwarn_init (input_location, OPT_pedantic,
6217 "initialization of a flexible array member");
6219 /* We have already issued an error message for the existence
6220 of a flexible array member not at the end of the structure.
6221 Discard the initializer so that we do not die later. */
6222 if (TREE_CHAIN (constructor_fields) != NULL_TREE)
6223 constructor_type = NULL_TREE;
6227 /* Warn when some struct elements are implicitly initialized to zero. */
6228 if (warn_missing_field_initializers
6230 && TREE_CODE (constructor_type) == RECORD_TYPE
6231 && constructor_unfilled_fields)
6233 /* Do not warn for flexible array members or zero-length arrays. */
6234 while (constructor_unfilled_fields
6235 && (!DECL_SIZE (constructor_unfilled_fields)
6236 || integer_zerop (DECL_SIZE (constructor_unfilled_fields))))
6237 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
6239 /* Do not warn if this level of the initializer uses member
6240 designators; it is likely to be deliberate. */
6241 if (constructor_unfilled_fields && !constructor_designated)
6243 push_member_name (constructor_unfilled_fields);
6244 warning_init (OPT_Wmissing_field_initializers,
6245 "missing initializer");
6246 RESTORE_SPELLING_DEPTH (constructor_depth);
6250 /* Pad out the end of the structure. */
6251 if (p->replacement_value.value)
6252 /* If this closes a superfluous brace pair,
6253 just pass out the element between them. */
6254 ret = p->replacement_value;
6255 else if (constructor_type == 0)
6257 else if (TREE_CODE (constructor_type) != RECORD_TYPE
6258 && TREE_CODE (constructor_type) != UNION_TYPE
6259 && TREE_CODE (constructor_type) != ARRAY_TYPE
6260 && TREE_CODE (constructor_type) != VECTOR_TYPE)
6262 /* A nonincremental scalar initializer--just return
6263 the element, after verifying there is just one. */
6264 if (VEC_empty (constructor_elt,constructor_elements))
6266 if (!constructor_erroneous)
6267 error_init ("empty scalar initializer");
6268 ret.value = error_mark_node;
6270 else if (VEC_length (constructor_elt,constructor_elements) != 1)
6272 error_init ("extra elements in scalar initializer");
6273 ret.value = VEC_index (constructor_elt,constructor_elements,0)->value;
6276 ret.value = VEC_index (constructor_elt,constructor_elements,0)->value;
6280 if (constructor_erroneous)
6281 ret.value = error_mark_node;
6284 ret.value = build_constructor (constructor_type,
6285 constructor_elements);
6286 if (constructor_constant)
6287 TREE_CONSTANT (ret.value) = 1;
6288 if (constructor_constant && constructor_simple)
6289 TREE_STATIC (ret.value) = 1;
6290 if (constructor_nonconst)
6291 CONSTRUCTOR_NON_CONST (ret.value) = 1;
6295 if (ret.value && TREE_CODE (ret.value) != CONSTRUCTOR)
6297 if (constructor_nonconst)
6298 ret.original_code = C_MAYBE_CONST_EXPR;
6299 else if (ret.original_code == C_MAYBE_CONST_EXPR)
6300 ret.original_code = ERROR_MARK;
6303 constructor_type = p->type;
6304 constructor_fields = p->fields;
6305 constructor_index = p->index;
6306 constructor_max_index = p->max_index;
6307 constructor_unfilled_index = p->unfilled_index;
6308 constructor_unfilled_fields = p->unfilled_fields;
6309 constructor_bit_index = p->bit_index;
6310 constructor_elements = p->elements;
6311 constructor_constant = p->constant;
6312 constructor_simple = p->simple;
6313 constructor_nonconst = p->nonconst;
6314 constructor_erroneous = p->erroneous;
6315 constructor_incremental = p->incremental;
6316 constructor_designated = p->designated;
6317 constructor_pending_elts = p->pending_elts;
6318 constructor_depth = p->depth;
6320 constructor_range_stack = p->range_stack;
6321 RESTORE_SPELLING_DEPTH (constructor_depth);
6323 constructor_stack = p->next;
6326 if (ret.value == 0 && constructor_stack == 0)
6327 ret.value = error_mark_node;
6331 /* Common handling for both array range and field name designators.
6332 ARRAY argument is nonzero for array ranges. Returns zero for success. */
6335 set_designator (int array)
6338 enum tree_code subcode;
6340 /* Don't die if an entire brace-pair level is superfluous
6341 in the containing level. */
6342 if (constructor_type == 0)
6345 /* If there were errors in this designator list already, bail out
6347 if (designator_erroneous)
6350 if (!designator_depth)
6352 gcc_assert (!constructor_range_stack);
6354 /* Designator list starts at the level of closest explicit
6356 while (constructor_stack->implicit)
6357 process_init_element (pop_init_level (1), true);
6358 constructor_designated = 1;
6362 switch (TREE_CODE (constructor_type))
6366 subtype = TREE_TYPE (constructor_fields);
6367 if (subtype != error_mark_node)
6368 subtype = TYPE_MAIN_VARIANT (subtype);
6371 subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6377 subcode = TREE_CODE (subtype);
6378 if (array && subcode != ARRAY_TYPE)
6380 error_init ("array index in non-array initializer");
6383 else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE)
6385 error_init ("field name not in record or union initializer");
6389 constructor_designated = 1;
6390 push_init_level (2);
6394 /* If there are range designators in designator list, push a new designator
6395 to constructor_range_stack. RANGE_END is end of such stack range or
6396 NULL_TREE if there is no range designator at this level. */
6399 push_range_stack (tree range_end)
6401 struct constructor_range_stack *p;
6403 p = GGC_NEW (struct constructor_range_stack);
6404 p->prev = constructor_range_stack;
6406 p->fields = constructor_fields;
6407 p->range_start = constructor_index;
6408 p->index = constructor_index;
6409 p->stack = constructor_stack;
6410 p->range_end = range_end;
6411 if (constructor_range_stack)
6412 constructor_range_stack->next = p;
6413 constructor_range_stack = p;
6416 /* Within an array initializer, specify the next index to be initialized.
6417 FIRST is that index. If LAST is nonzero, then initialize a range
6418 of indices, running from FIRST through LAST. */
6421 set_init_index (tree first, tree last)
6423 if (set_designator (1))
6426 designator_erroneous = 1;
6428 if (!INTEGRAL_TYPE_P (TREE_TYPE (first))
6429 || (last && !INTEGRAL_TYPE_P (TREE_TYPE (last))))
6431 error_init ("array index in initializer not of integer type");
6435 if (TREE_CODE (first) != INTEGER_CST)
6437 first = c_fully_fold (first, false, NULL);
6438 if (TREE_CODE (first) == INTEGER_CST)
6439 pedwarn_init (input_location, OPT_pedantic,
6440 "array index in initializer is not "
6441 "an integer constant expression");
6444 if (last && TREE_CODE (last) != INTEGER_CST)
6446 last = c_fully_fold (last, false, NULL);
6447 if (TREE_CODE (last) == INTEGER_CST)
6448 pedwarn_init (input_location, OPT_pedantic,
6449 "array index in initializer is not "
6450 "an integer constant expression");
6453 if (TREE_CODE (first) != INTEGER_CST)
6454 error_init ("nonconstant array index in initializer");
6455 else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
6456 error_init ("nonconstant array index in initializer");
6457 else if (TREE_CODE (constructor_type) != ARRAY_TYPE)
6458 error_init ("array index in non-array initializer");
6459 else if (tree_int_cst_sgn (first) == -1)
6460 error_init ("array index in initializer exceeds array bounds");
6461 else if (constructor_max_index
6462 && tree_int_cst_lt (constructor_max_index, first))
6463 error_init ("array index in initializer exceeds array bounds");
6466 constant_expression_warning (first);
6468 constant_expression_warning (last);
6469 constructor_index = convert (bitsizetype, first);
6473 if (tree_int_cst_equal (first, last))
6475 else if (tree_int_cst_lt (last, first))
6477 error_init ("empty index range in initializer");
6482 last = convert (bitsizetype, last);
6483 if (constructor_max_index != 0
6484 && tree_int_cst_lt (constructor_max_index, last))
6486 error_init ("array index range in initializer exceeds array bounds");
6493 designator_erroneous = 0;
6494 if (constructor_range_stack || last)
6495 push_range_stack (last);
6499 /* Within a struct initializer, specify the next field to be initialized. */
6502 set_init_label (tree fieldname)
6506 if (set_designator (0))
6509 designator_erroneous = 1;
6511 if (TREE_CODE (constructor_type) != RECORD_TYPE
6512 && TREE_CODE (constructor_type) != UNION_TYPE)
6514 error_init ("field name not in record or union initializer");
6518 for (tail = TYPE_FIELDS (constructor_type); tail;
6519 tail = TREE_CHAIN (tail))
6521 if (DECL_NAME (tail) == fieldname)
6526 error ("unknown field %qE specified in initializer", fieldname);
6529 constructor_fields = tail;
6531 designator_erroneous = 0;
6532 if (constructor_range_stack)
6533 push_range_stack (NULL_TREE);
6537 /* Add a new initializer to the tree of pending initializers. PURPOSE
6538 identifies the initializer, either array index or field in a structure.
6539 VALUE is the value of that index or field. If ORIGTYPE is not
6540 NULL_TREE, it is the original type of VALUE.
6542 IMPLICIT is true if value comes from pop_init_level (1),
6543 the new initializer has been merged with the existing one
6544 and thus no warnings should be emitted about overriding an
6545 existing initializer. */
6548 add_pending_init (tree purpose, tree value, tree origtype, bool implicit)
6550 struct init_node *p, **q, *r;
6552 q = &constructor_pending_elts;
6555 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6560 if (tree_int_cst_lt (purpose, p->purpose))
6562 else if (tree_int_cst_lt (p->purpose, purpose))
6568 if (TREE_SIDE_EFFECTS (p->value))
6569 warning_init (0, "initialized field with side-effects overwritten");
6570 else if (warn_override_init)
6571 warning_init (OPT_Woverride_init, "initialized field overwritten");
6574 p->origtype = origtype;
6583 bitpos = bit_position (purpose);
6587 if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
6589 else if (p->purpose != purpose)
6595 if (TREE_SIDE_EFFECTS (p->value))
6596 warning_init (0, "initialized field with side-effects overwritten");
6597 else if (warn_override_init)
6598 warning_init (OPT_Woverride_init, "initialized field overwritten");
6601 p->origtype = origtype;
6607 r = GGC_NEW (struct init_node);
6608 r->purpose = purpose;
6610 r->origtype = origtype;
6620 struct init_node *s;
6624 if (p->balance == 0)
6626 else if (p->balance < 0)
6633 p->left->parent = p;
6650 constructor_pending_elts = r;
6655 struct init_node *t = r->right;
6659 r->right->parent = r;
6664 p->left->parent = p;
6667 p->balance = t->balance < 0;
6668 r->balance = -(t->balance > 0);
6683 constructor_pending_elts = t;
6689 /* p->balance == +1; growth of left side balances the node. */
6694 else /* r == p->right */
6696 if (p->balance == 0)
6697 /* Growth propagation from right side. */
6699 else if (p->balance > 0)
6706 p->right->parent = p;
6723 constructor_pending_elts = r;
6725 else /* r->balance == -1 */
6728 struct init_node *t = r->left;
6732 r->left->parent = r;
6737 p->right->parent = p;
6740 r->balance = (t->balance < 0);
6741 p->balance = -(t->balance > 0);
6756 constructor_pending_elts = t;
6762 /* p->balance == -1; growth of right side balances the node. */
6773 /* Build AVL tree from a sorted chain. */
6776 set_nonincremental_init (void)
6778 unsigned HOST_WIDE_INT ix;
6781 if (TREE_CODE (constructor_type) != RECORD_TYPE
6782 && TREE_CODE (constructor_type) != ARRAY_TYPE)
6785 FOR_EACH_CONSTRUCTOR_ELT (constructor_elements, ix, index, value)
6786 add_pending_init (index, value, NULL_TREE, false);
6787 constructor_elements = 0;
6788 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6790 constructor_unfilled_fields = TYPE_FIELDS (constructor_type);
6791 /* Skip any nameless bit fields at the beginning. */
6792 while (constructor_unfilled_fields != 0
6793 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
6794 && DECL_NAME (constructor_unfilled_fields) == 0)
6795 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
6798 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6800 if (TYPE_DOMAIN (constructor_type))
6801 constructor_unfilled_index
6802 = convert (bitsizetype,
6803 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
6805 constructor_unfilled_index = bitsize_zero_node;
6807 constructor_incremental = 0;
6810 /* Build AVL tree from a string constant. */
6813 set_nonincremental_init_from_string (tree str)
6815 tree value, purpose, type;
6816 HOST_WIDE_INT val[2];
6817 const char *p, *end;
6818 int byte, wchar_bytes, charwidth, bitpos;
6820 gcc_assert (TREE_CODE (constructor_type) == ARRAY_TYPE);
6822 wchar_bytes = TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) / BITS_PER_UNIT;
6823 charwidth = TYPE_PRECISION (char_type_node);
6824 type = TREE_TYPE (constructor_type);
6825 p = TREE_STRING_POINTER (str);
6826 end = p + TREE_STRING_LENGTH (str);
6828 for (purpose = bitsize_zero_node;
6829 p < end && !tree_int_cst_lt (constructor_max_index, purpose);
6830 purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node))
6832 if (wchar_bytes == 1)
6834 val[1] = (unsigned char) *p++;
6841 for (byte = 0; byte < wchar_bytes; byte++)
6843 if (BYTES_BIG_ENDIAN)
6844 bitpos = (wchar_bytes - byte - 1) * charwidth;
6846 bitpos = byte * charwidth;
6847 val[bitpos < HOST_BITS_PER_WIDE_INT]
6848 |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++))
6849 << (bitpos % HOST_BITS_PER_WIDE_INT);
6853 if (!TYPE_UNSIGNED (type))
6855 bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR;
6856 if (bitpos < HOST_BITS_PER_WIDE_INT)
6858 if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1)))
6860 val[1] |= ((HOST_WIDE_INT) -1) << bitpos;
6864 else if (bitpos == HOST_BITS_PER_WIDE_INT)
6869 else if (val[0] & (((HOST_WIDE_INT) 1)
6870 << (bitpos - 1 - HOST_BITS_PER_WIDE_INT)))
6871 val[0] |= ((HOST_WIDE_INT) -1)
6872 << (bitpos - HOST_BITS_PER_WIDE_INT);
6875 value = build_int_cst_wide (type, val[1], val[0]);
6876 add_pending_init (purpose, value, NULL_TREE, false);
6879 constructor_incremental = 0;
6882 /* Return value of FIELD in pending initializer or zero if the field was
6883 not initialized yet. */
6886 find_init_member (tree field)
6888 struct init_node *p;
6890 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6892 if (constructor_incremental
6893 && tree_int_cst_lt (field, constructor_unfilled_index))
6894 set_nonincremental_init ();
6896 p = constructor_pending_elts;
6899 if (tree_int_cst_lt (field, p->purpose))
6901 else if (tree_int_cst_lt (p->purpose, field))
6907 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6909 tree bitpos = bit_position (field);
6911 if (constructor_incremental
6912 && (!constructor_unfilled_fields
6913 || tree_int_cst_lt (bitpos,
6914 bit_position (constructor_unfilled_fields))))
6915 set_nonincremental_init ();
6917 p = constructor_pending_elts;
6920 if (field == p->purpose)
6922 else if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
6928 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6930 if (!VEC_empty (constructor_elt, constructor_elements)
6931 && (VEC_last (constructor_elt, constructor_elements)->index
6933 return VEC_last (constructor_elt, constructor_elements)->value;
6938 /* "Output" the next constructor element.
6939 At top level, really output it to assembler code now.
6940 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
6941 If ORIGTYPE is not NULL_TREE, it is the original type of VALUE.
6942 TYPE is the data type that the containing data type wants here.
6943 FIELD is the field (a FIELD_DECL) or the index that this element fills.
6944 If VALUE is a string constant, STRICT_STRING is true if it is
6945 unparenthesized or we should not warn here for it being parenthesized.
6946 For other types of VALUE, STRICT_STRING is not used.
6948 PENDING if non-nil means output pending elements that belong
6949 right after this element. (PENDING is normally 1;
6950 it is 0 while outputting pending elements, to avoid recursion.)
6952 IMPLICIT is true if value comes from pop_init_level (1),
6953 the new initializer has been merged with the existing one
6954 and thus no warnings should be emitted about overriding an
6955 existing initializer. */
6958 output_init_element (tree value, tree origtype, bool strict_string, tree type,
6959 tree field, int pending, bool implicit)
6961 tree semantic_type = NULL_TREE;
6962 constructor_elt *celt;
6963 bool maybe_const = true;
6966 if (type == error_mark_node || value == error_mark_node)
6968 constructor_erroneous = 1;
6971 if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
6972 && (TREE_CODE (value) == STRING_CST
6973 || TREE_CODE (value) == COMPOUND_LITERAL_EXPR)
6974 && !(TREE_CODE (value) == STRING_CST
6975 && TREE_CODE (type) == ARRAY_TYPE
6976 && INTEGRAL_TYPE_P (TREE_TYPE (type)))
6977 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
6978 TYPE_MAIN_VARIANT (type)))
6979 value = array_to_pointer_conversion (value);
6981 if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR
6982 && require_constant_value && !flag_isoc99 && pending)
6984 /* As an extension, allow initializing objects with static storage
6985 duration with compound literals (which are then treated just as
6986 the brace enclosed list they contain). */
6987 tree decl = COMPOUND_LITERAL_EXPR_DECL (value);
6988 value = DECL_INITIAL (decl);
6991 npc = null_pointer_constant_p (value);
6992 if (TREE_CODE (value) == EXCESS_PRECISION_EXPR)
6994 semantic_type = TREE_TYPE (value);
6995 value = TREE_OPERAND (value, 0);
6997 value = c_fully_fold (value, require_constant_value, &maybe_const);
6999 if (value == error_mark_node)
7000 constructor_erroneous = 1;
7001 else if (!TREE_CONSTANT (value))
7002 constructor_constant = 0;
7003 else if (!initializer_constant_valid_p (value, TREE_TYPE (value))
7004 || ((TREE_CODE (constructor_type) == RECORD_TYPE
7005 || TREE_CODE (constructor_type) == UNION_TYPE)
7006 && DECL_C_BIT_FIELD (field)
7007 && TREE_CODE (value) != INTEGER_CST))
7008 constructor_simple = 0;
7010 constructor_nonconst = 1;
7012 if (!initializer_constant_valid_p (value, TREE_TYPE (value)))
7014 if (require_constant_value)
7016 error_init ("initializer element is not constant");
7017 value = error_mark_node;
7019 else if (require_constant_elements)
7020 pedwarn (input_location, 0,
7021 "initializer element is not computable at load time");
7023 else if (!maybe_const
7024 && (require_constant_value || require_constant_elements))
7025 pedwarn_init (input_location, 0,
7026 "initializer element is not a constant expression");
7028 /* Issue -Wc++-compat warnings about initializing a bitfield with
7031 && field != NULL_TREE
7032 && TREE_CODE (field) == FIELD_DECL
7033 && DECL_BIT_FIELD_TYPE (field) != NULL_TREE
7034 && (TYPE_MAIN_VARIANT (DECL_BIT_FIELD_TYPE (field))
7035 != TYPE_MAIN_VARIANT (type))
7036 && TREE_CODE (DECL_BIT_FIELD_TYPE (field)) == ENUMERAL_TYPE)
7038 tree checktype = origtype != NULL_TREE ? origtype : TREE_TYPE (value);
7039 if (checktype != error_mark_node
7040 && (TYPE_MAIN_VARIANT (checktype)
7041 != TYPE_MAIN_VARIANT (DECL_BIT_FIELD_TYPE (field))))
7042 warning_init (OPT_Wc___compat,
7043 "enum conversion in initialization is invalid in C++");
7046 /* If this field is empty (and not at the end of structure),
7047 don't do anything other than checking the initializer. */
7049 && (TREE_TYPE (field) == error_mark_node
7050 || (COMPLETE_TYPE_P (TREE_TYPE (field))
7051 && integer_zerop (TYPE_SIZE (TREE_TYPE (field)))
7052 && (TREE_CODE (constructor_type) == ARRAY_TYPE
7053 || TREE_CHAIN (field)))))
7057 value = build1 (EXCESS_PRECISION_EXPR, semantic_type, value);
7058 value = digest_init (type, value, origtype, npc, strict_string,
7059 require_constant_value);
7060 if (value == error_mark_node)
7062 constructor_erroneous = 1;
7065 if (require_constant_value || require_constant_elements)
7066 constant_expression_warning (value);
7068 /* If this element doesn't come next in sequence,
7069 put it on constructor_pending_elts. */
7070 if (TREE_CODE (constructor_type) == ARRAY_TYPE
7071 && (!constructor_incremental
7072 || !tree_int_cst_equal (field, constructor_unfilled_index)))
7074 if (constructor_incremental
7075 && tree_int_cst_lt (field, constructor_unfilled_index))
7076 set_nonincremental_init ();
7078 add_pending_init (field, value, origtype, implicit);
7081 else if (TREE_CODE (constructor_type) == RECORD_TYPE
7082 && (!constructor_incremental
7083 || field != constructor_unfilled_fields))
7085 /* We do this for records but not for unions. In a union,
7086 no matter which field is specified, it can be initialized
7087 right away since it starts at the beginning of the union. */
7088 if (constructor_incremental)
7090 if (!constructor_unfilled_fields)
7091 set_nonincremental_init ();
7094 tree bitpos, unfillpos;
7096 bitpos = bit_position (field);
7097 unfillpos = bit_position (constructor_unfilled_fields);
7099 if (tree_int_cst_lt (bitpos, unfillpos))
7100 set_nonincremental_init ();
7104 add_pending_init (field, value, origtype, implicit);
7107 else if (TREE_CODE (constructor_type) == UNION_TYPE
7108 && !VEC_empty (constructor_elt, constructor_elements))
7112 if (TREE_SIDE_EFFECTS (VEC_last (constructor_elt,
7113 constructor_elements)->value))
7115 "initialized field with side-effects overwritten");
7116 else if (warn_override_init)
7117 warning_init (OPT_Woverride_init, "initialized field overwritten");
7120 /* We can have just one union field set. */
7121 constructor_elements = 0;
7124 /* Otherwise, output this element either to
7125 constructor_elements or to the assembler file. */
7127 celt = VEC_safe_push (constructor_elt, gc, constructor_elements, NULL);
7128 celt->index = field;
7129 celt->value = value;
7131 /* Advance the variable that indicates sequential elements output. */
7132 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
7133 constructor_unfilled_index
7134 = size_binop (PLUS_EXPR, constructor_unfilled_index,
7136 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
7138 constructor_unfilled_fields
7139 = TREE_CHAIN (constructor_unfilled_fields);
7141 /* Skip any nameless bit fields. */
7142 while (constructor_unfilled_fields != 0
7143 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
7144 && DECL_NAME (constructor_unfilled_fields) == 0)
7145 constructor_unfilled_fields =
7146 TREE_CHAIN (constructor_unfilled_fields);
7148 else if (TREE_CODE (constructor_type) == UNION_TYPE)
7149 constructor_unfilled_fields = 0;
7151 /* Now output any pending elements which have become next. */
7153 output_pending_init_elements (0);
7156 /* Output any pending elements which have become next.
7157 As we output elements, constructor_unfilled_{fields,index}
7158 advances, which may cause other elements to become next;
7159 if so, they too are output.
7161 If ALL is 0, we return when there are
7162 no more pending elements to output now.
7164 If ALL is 1, we output space as necessary so that
7165 we can output all the pending elements. */
7168 output_pending_init_elements (int all)
7170 struct init_node *elt = constructor_pending_elts;
7175 /* Look through the whole pending tree.
7176 If we find an element that should be output now,
7177 output it. Otherwise, set NEXT to the element
7178 that comes first among those still pending. */
7183 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
7185 if (tree_int_cst_equal (elt->purpose,
7186 constructor_unfilled_index))
7187 output_init_element (elt->value, elt->origtype, true,
7188 TREE_TYPE (constructor_type),
7189 constructor_unfilled_index, 0, false);
7190 else if (tree_int_cst_lt (constructor_unfilled_index,
7193 /* Advance to the next smaller node. */
7198 /* We have reached the smallest node bigger than the
7199 current unfilled index. Fill the space first. */
7200 next = elt->purpose;
7206 /* Advance to the next bigger node. */
7211 /* We have reached the biggest node in a subtree. Find
7212 the parent of it, which is the next bigger node. */
7213 while (elt->parent && elt->parent->right == elt)
7216 if (elt && tree_int_cst_lt (constructor_unfilled_index,
7219 next = elt->purpose;
7225 else if (TREE_CODE (constructor_type) == RECORD_TYPE
7226 || TREE_CODE (constructor_type) == UNION_TYPE)
7228 tree ctor_unfilled_bitpos, elt_bitpos;
7230 /* If the current record is complete we are done. */
7231 if (constructor_unfilled_fields == 0)
7234 ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields);
7235 elt_bitpos = bit_position (elt->purpose);
7236 /* We can't compare fields here because there might be empty
7237 fields in between. */
7238 if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos))
7240 constructor_unfilled_fields = elt->purpose;
7241 output_init_element (elt->value, elt->origtype, true,
7242 TREE_TYPE (elt->purpose),
7243 elt->purpose, 0, false);
7245 else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos))
7247 /* Advance to the next smaller node. */
7252 /* We have reached the smallest node bigger than the
7253 current unfilled field. Fill the space first. */
7254 next = elt->purpose;
7260 /* Advance to the next bigger node. */
7265 /* We have reached the biggest node in a subtree. Find
7266 the parent of it, which is the next bigger node. */
7267 while (elt->parent && elt->parent->right == elt)
7271 && (tree_int_cst_lt (ctor_unfilled_bitpos,
7272 bit_position (elt->purpose))))
7274 next = elt->purpose;
7282 /* Ordinarily return, but not if we want to output all
7283 and there are elements left. */
7284 if (!(all && next != 0))
7287 /* If it's not incremental, just skip over the gap, so that after
7288 jumping to retry we will output the next successive element. */
7289 if (TREE_CODE (constructor_type) == RECORD_TYPE
7290 || TREE_CODE (constructor_type) == UNION_TYPE)
7291 constructor_unfilled_fields = next;
7292 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
7293 constructor_unfilled_index = next;
7295 /* ELT now points to the node in the pending tree with the next
7296 initializer to output. */
7300 /* Add one non-braced element to the current constructor level.
7301 This adjusts the current position within the constructor's type.
7302 This may also start or terminate implicit levels
7303 to handle a partly-braced initializer.
7305 Once this has found the correct level for the new element,
7306 it calls output_init_element.
7308 IMPLICIT is true if value comes from pop_init_level (1),
7309 the new initializer has been merged with the existing one
7310 and thus no warnings should be emitted about overriding an
7311 existing initializer. */
7314 process_init_element (struct c_expr value, bool implicit)
7316 tree orig_value = value.value;
7317 int string_flag = orig_value != 0 && TREE_CODE (orig_value) == STRING_CST;
7318 bool strict_string = value.original_code == STRING_CST;
7320 designator_depth = 0;
7321 designator_erroneous = 0;
7323 /* Handle superfluous braces around string cst as in
7324 char x[] = {"foo"}; */
7327 && TREE_CODE (constructor_type) == ARRAY_TYPE
7328 && INTEGRAL_TYPE_P (TREE_TYPE (constructor_type))
7329 && integer_zerop (constructor_unfilled_index))
7331 if (constructor_stack->replacement_value.value)
7332 error_init ("excess elements in char array initializer");
7333 constructor_stack->replacement_value = value;
7337 if (constructor_stack->replacement_value.value != 0)
7339 error_init ("excess elements in struct initializer");
7343 /* Ignore elements of a brace group if it is entirely superfluous
7344 and has already been diagnosed. */
7345 if (constructor_type == 0)
7348 /* If we've exhausted any levels that didn't have braces,
7350 while (constructor_stack->implicit)
7352 if ((TREE_CODE (constructor_type) == RECORD_TYPE
7353 || TREE_CODE (constructor_type) == UNION_TYPE)
7354 && constructor_fields == 0)
7355 process_init_element (pop_init_level (1), true);
7356 else if ((TREE_CODE (constructor_type) == ARRAY_TYPE
7357 || TREE_CODE (constructor_type) == VECTOR_TYPE)
7358 && (constructor_max_index == 0
7359 || tree_int_cst_lt (constructor_max_index,
7360 constructor_index)))
7361 process_init_element (pop_init_level (1), true);
7366 /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
7367 if (constructor_range_stack)
7369 /* If value is a compound literal and we'll be just using its
7370 content, don't put it into a SAVE_EXPR. */
7371 if (TREE_CODE (value.value) != COMPOUND_LITERAL_EXPR
7372 || !require_constant_value
7375 tree semantic_type = NULL_TREE;
7376 if (TREE_CODE (value.value) == EXCESS_PRECISION_EXPR)
7378 semantic_type = TREE_TYPE (value.value);
7379 value.value = TREE_OPERAND (value.value, 0);
7381 value.value = c_save_expr (value.value);
7383 value.value = build1 (EXCESS_PRECISION_EXPR, semantic_type,
7390 if (TREE_CODE (constructor_type) == RECORD_TYPE)
7393 enum tree_code fieldcode;
7395 if (constructor_fields == 0)
7397 pedwarn_init (input_location, 0,
7398 "excess elements in struct initializer");
7402 fieldtype = TREE_TYPE (constructor_fields);
7403 if (fieldtype != error_mark_node)
7404 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
7405 fieldcode = TREE_CODE (fieldtype);
7407 /* Error for non-static initialization of a flexible array member. */
7408 if (fieldcode == ARRAY_TYPE
7409 && !require_constant_value
7410 && TYPE_SIZE (fieldtype) == NULL_TREE
7411 && TREE_CHAIN (constructor_fields) == NULL_TREE)
7413 error_init ("non-static initialization of a flexible array member");
7417 /* Accept a string constant to initialize a subarray. */
7418 if (value.value != 0
7419 && fieldcode == ARRAY_TYPE
7420 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype))
7422 value.value = orig_value;
7423 /* Otherwise, if we have come to a subaggregate,
7424 and we don't have an element of its type, push into it. */
7425 else if (value.value != 0
7426 && value.value != error_mark_node
7427 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype
7428 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
7429 || fieldcode == UNION_TYPE || fieldcode == VECTOR_TYPE))
7431 push_init_level (1);
7437 push_member_name (constructor_fields);
7438 output_init_element (value.value, value.original_type,
7439 strict_string, fieldtype,
7440 constructor_fields, 1, implicit);
7441 RESTORE_SPELLING_DEPTH (constructor_depth);
7444 /* Do the bookkeeping for an element that was
7445 directly output as a constructor. */
7447 /* For a record, keep track of end position of last field. */
7448 if (DECL_SIZE (constructor_fields))
7449 constructor_bit_index
7450 = size_binop (PLUS_EXPR,
7451 bit_position (constructor_fields),
7452 DECL_SIZE (constructor_fields));
7454 /* If the current field was the first one not yet written out,
7455 it isn't now, so update. */
7456 if (constructor_unfilled_fields == constructor_fields)
7458 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
7459 /* Skip any nameless bit fields. */
7460 while (constructor_unfilled_fields != 0
7461 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
7462 && DECL_NAME (constructor_unfilled_fields) == 0)
7463 constructor_unfilled_fields =
7464 TREE_CHAIN (constructor_unfilled_fields);
7468 constructor_fields = TREE_CHAIN (constructor_fields);
7469 /* Skip any nameless bit fields at the beginning. */
7470 while (constructor_fields != 0
7471 && DECL_C_BIT_FIELD (constructor_fields)
7472 && DECL_NAME (constructor_fields) == 0)
7473 constructor_fields = TREE_CHAIN (constructor_fields);
7475 else if (TREE_CODE (constructor_type) == UNION_TYPE)
7478 enum tree_code fieldcode;
7480 if (constructor_fields == 0)
7482 pedwarn_init (input_location, 0,
7483 "excess elements in union initializer");
7487 fieldtype = TREE_TYPE (constructor_fields);
7488 if (fieldtype != error_mark_node)
7489 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
7490 fieldcode = TREE_CODE (fieldtype);
7492 /* Warn that traditional C rejects initialization of unions.
7493 We skip the warning if the value is zero. This is done
7494 under the assumption that the zero initializer in user
7495 code appears conditioned on e.g. __STDC__ to avoid
7496 "missing initializer" warnings and relies on default
7497 initialization to zero in the traditional C case.
7498 We also skip the warning if the initializer is designated,
7499 again on the assumption that this must be conditional on
7500 __STDC__ anyway (and we've already complained about the
7501 member-designator already). */
7502 if (!in_system_header && !constructor_designated
7503 && !(value.value && (integer_zerop (value.value)
7504 || real_zerop (value.value))))
7505 warning (OPT_Wtraditional, "traditional C rejects initialization "
7508 /* Accept a string constant to initialize a subarray. */
7509 if (value.value != 0
7510 && fieldcode == ARRAY_TYPE
7511 && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype))
7513 value.value = orig_value;
7514 /* Otherwise, if we have come to a subaggregate,
7515 and we don't have an element of its type, push into it. */
7516 else if (value.value != 0
7517 && value.value != error_mark_node
7518 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype
7519 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
7520 || fieldcode == UNION_TYPE || fieldcode == VECTOR_TYPE))
7522 push_init_level (1);
7528 push_member_name (constructor_fields);
7529 output_init_element (value.value, value.original_type,
7530 strict_string, fieldtype,
7531 constructor_fields, 1, implicit);
7532 RESTORE_SPELLING_DEPTH (constructor_depth);
7535 /* Do the bookkeeping for an element that was
7536 directly output as a constructor. */
7538 constructor_bit_index = DECL_SIZE (constructor_fields);
7539 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
7542 constructor_fields = 0;
7544 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
7546 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
7547 enum tree_code eltcode = TREE_CODE (elttype);
7549 /* Accept a string constant to initialize a subarray. */
7550 if (value.value != 0
7551 && eltcode == ARRAY_TYPE
7552 && INTEGRAL_TYPE_P (TREE_TYPE (elttype))
7554 value.value = orig_value;
7555 /* Otherwise, if we have come to a subaggregate,
7556 and we don't have an element of its type, push into it. */
7557 else if (value.value != 0
7558 && value.value != error_mark_node
7559 && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != elttype
7560 && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
7561 || eltcode == UNION_TYPE || eltcode == VECTOR_TYPE))
7563 push_init_level (1);
7567 if (constructor_max_index != 0
7568 && (tree_int_cst_lt (constructor_max_index, constructor_index)
7569 || integer_all_onesp (constructor_max_index)))
7571 pedwarn_init (input_location, 0,
7572 "excess elements in array initializer");
7576 /* Now output the actual element. */
7579 push_array_bounds (tree_low_cst (constructor_index, 1));
7580 output_init_element (value.value, value.original_type,
7581 strict_string, elttype,
7582 constructor_index, 1, implicit);
7583 RESTORE_SPELLING_DEPTH (constructor_depth);
7587 = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
7590 /* If we are doing the bookkeeping for an element that was
7591 directly output as a constructor, we must update
7592 constructor_unfilled_index. */
7593 constructor_unfilled_index = constructor_index;
7595 else if (TREE_CODE (constructor_type) == VECTOR_TYPE)
7597 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
7599 /* Do a basic check of initializer size. Note that vectors
7600 always have a fixed size derived from their type. */
7601 if (tree_int_cst_lt (constructor_max_index, constructor_index))
7603 pedwarn_init (input_location, 0,
7604 "excess elements in vector initializer");
7608 /* Now output the actual element. */
7611 if (TREE_CODE (value.value) == VECTOR_CST)
7612 elttype = TYPE_MAIN_VARIANT (constructor_type);
7613 output_init_element (value.value, value.original_type,
7614 strict_string, elttype,
7615 constructor_index, 1, implicit);
7619 = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
7622 /* If we are doing the bookkeeping for an element that was
7623 directly output as a constructor, we must update
7624 constructor_unfilled_index. */
7625 constructor_unfilled_index = constructor_index;
7628 /* Handle the sole element allowed in a braced initializer
7629 for a scalar variable. */
7630 else if (constructor_type != error_mark_node
7631 && constructor_fields == 0)
7633 pedwarn_init (input_location, 0,
7634 "excess elements in scalar initializer");
7640 output_init_element (value.value, value.original_type,
7641 strict_string, constructor_type,
7642 NULL_TREE, 1, implicit);
7643 constructor_fields = 0;
7646 /* Handle range initializers either at this level or anywhere higher
7647 in the designator stack. */
7648 if (constructor_range_stack)
7650 struct constructor_range_stack *p, *range_stack;
7653 range_stack = constructor_range_stack;
7654 constructor_range_stack = 0;
7655 while (constructor_stack != range_stack->stack)
7657 gcc_assert (constructor_stack->implicit);
7658 process_init_element (pop_init_level (1), true);
7660 for (p = range_stack;
7661 !p->range_end || tree_int_cst_equal (p->index, p->range_end);
7664 gcc_assert (constructor_stack->implicit);
7665 process_init_element (pop_init_level (1), true);
7668 p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node);
7669 if (tree_int_cst_equal (p->index, p->range_end) && !p->prev)
7674 constructor_index = p->index;
7675 constructor_fields = p->fields;
7676 if (finish && p->range_end && p->index == p->range_start)
7684 push_init_level (2);
7685 p->stack = constructor_stack;
7686 if (p->range_end && tree_int_cst_equal (p->index, p->range_end))
7687 p->index = p->range_start;
7691 constructor_range_stack = range_stack;
7698 constructor_range_stack = 0;
7701 /* Build a complete asm-statement, whose components are a CV_QUALIFIER
7702 (guaranteed to be 'volatile' or null) and ARGS (represented using
7703 an ASM_EXPR node). */
7705 build_asm_stmt (tree cv_qualifier, tree args)
7707 if (!ASM_VOLATILE_P (args) && cv_qualifier)
7708 ASM_VOLATILE_P (args) = 1;
7709 return add_stmt (args);
7712 /* Build an asm-expr, whose components are a STRING, some OUTPUTS,
7713 some INPUTS, and some CLOBBERS. The latter three may be NULL.
7714 SIMPLE indicates whether there was anything at all after the
7715 string in the asm expression -- asm("blah") and asm("blah" : )
7716 are subtly different. We use a ASM_EXPR node to represent this. */
7718 build_asm_expr (tree string, tree outputs, tree inputs, tree clobbers,
7724 const char *constraint;
7725 const char **oconstraints;
7726 bool allows_mem, allows_reg, is_inout;
7727 int ninputs, noutputs;
7729 ninputs = list_length (inputs);
7730 noutputs = list_length (outputs);
7731 oconstraints = (const char **) alloca (noutputs * sizeof (const char *));
7733 string = resolve_asm_operand_names (string, outputs, inputs);
7735 /* Remove output conversions that change the type but not the mode. */
7736 for (i = 0, tail = outputs; tail; ++i, tail = TREE_CHAIN (tail))
7738 tree output = TREE_VALUE (tail);
7740 /* ??? Really, this should not be here. Users should be using a
7741 proper lvalue, dammit. But there's a long history of using casts
7742 in the output operands. In cases like longlong.h, this becomes a
7743 primitive form of typechecking -- if the cast can be removed, then
7744 the output operand had a type of the proper width; otherwise we'll
7745 get an error. Gross, but ... */
7746 STRIP_NOPS (output);
7748 if (!lvalue_or_else (output, lv_asm))
7749 output = error_mark_node;
7751 if (output != error_mark_node
7752 && (TREE_READONLY (output)
7753 || TYPE_READONLY (TREE_TYPE (output))
7754 || ((TREE_CODE (TREE_TYPE (output)) == RECORD_TYPE
7755 || TREE_CODE (TREE_TYPE (output)) == UNION_TYPE)
7756 && C_TYPE_FIELDS_READONLY (TREE_TYPE (output)))))
7757 readonly_error (output, lv_asm);
7759 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
7760 oconstraints[i] = constraint;
7762 if (parse_output_constraint (&constraint, i, ninputs, noutputs,
7763 &allows_mem, &allows_reg, &is_inout))
7765 /* If the operand is going to end up in memory,
7766 mark it addressable. */
7767 if (!allows_reg && !c_mark_addressable (output))
7768 output = error_mark_node;
7771 output = error_mark_node;
7773 TREE_VALUE (tail) = output;
7776 for (i = 0, tail = inputs; tail; ++i, tail = TREE_CHAIN (tail))
7780 constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
7781 input = TREE_VALUE (tail);
7783 if (parse_input_constraint (&constraint, i, ninputs, noutputs, 0,
7784 oconstraints, &allows_mem, &allows_reg))
7786 /* If the operand is going to end up in memory,
7787 mark it addressable. */
7788 if (!allows_reg && allows_mem)
7790 /* Strip the nops as we allow this case. FIXME, this really
7791 should be rejected or made deprecated. */
7793 if (!c_mark_addressable (input))
7794 input = error_mark_node;
7798 input = error_mark_node;
7800 TREE_VALUE (tail) = input;
7803 args = build_stmt (ASM_EXPR, string, outputs, inputs, clobbers);
7805 /* asm statements without outputs, including simple ones, are treated
7807 ASM_INPUT_P (args) = simple;
7808 ASM_VOLATILE_P (args) = (noutputs == 0);
7813 /* Generate a goto statement to LABEL. */
7816 c_finish_goto_label (tree label)
7818 tree decl = lookup_label (label);
7822 if (C_DECL_UNJUMPABLE_STMT_EXPR (decl))
7824 error ("jump into statement expression");
7828 if (C_DECL_UNJUMPABLE_VM (decl))
7830 error ("jump into scope of identifier with variably modified type");
7834 if (!C_DECL_UNDEFINABLE_STMT_EXPR (decl))
7836 /* No jump from outside this statement expression context, so
7837 record that there is a jump from within this context. */
7838 struct c_label_list *nlist;
7839 nlist = XOBNEW (&parser_obstack, struct c_label_list);
7840 nlist->next = label_context_stack_se->labels_used;
7841 nlist->label = decl;
7842 label_context_stack_se->labels_used = nlist;
7845 if (!C_DECL_UNDEFINABLE_VM (decl))
7847 /* No jump from outside this context context of identifiers with
7848 variably modified type, so record that there is a jump from
7849 within this context. */
7850 struct c_label_list *nlist;
7851 nlist = XOBNEW (&parser_obstack, struct c_label_list);
7852 nlist->next = label_context_stack_vm->labels_used;
7853 nlist->label = decl;
7854 label_context_stack_vm->labels_used = nlist;
7857 TREE_USED (decl) = 1;
7858 return add_stmt (build1 (GOTO_EXPR, void_type_node, decl));
7861 /* Generate a computed goto statement to EXPR. */
7864 c_finish_goto_ptr (tree expr)
7866 pedwarn (input_location, OPT_pedantic, "ISO C forbids %<goto *expr;%>");
7867 expr = c_fully_fold (expr, false, NULL);
7868 expr = convert (ptr_type_node, expr);
7869 return add_stmt (build1 (GOTO_EXPR, void_type_node, expr));
7872 /* Generate a C `return' statement. RETVAL is the expression for what
7873 to return, or a null pointer for `return;' with no value. If
7874 ORIGTYPE is not NULL_TREE, it is the original type of RETVAL. */
7877 c_finish_return (tree retval, tree origtype)
7879 tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)), ret_stmt;
7880 bool no_warning = false;
7883 if (TREE_THIS_VOLATILE (current_function_decl))
7884 warning (0, "function declared %<noreturn%> has a %<return%> statement");
7888 tree semantic_type = NULL_TREE;
7889 npc = null_pointer_constant_p (retval);
7890 if (TREE_CODE (retval) == EXCESS_PRECISION_EXPR)
7892 semantic_type = TREE_TYPE (retval);
7893 retval = TREE_OPERAND (retval, 0);
7895 retval = c_fully_fold (retval, false, NULL);
7897 retval = build1 (EXCESS_PRECISION_EXPR, semantic_type, retval);
7902 current_function_returns_null = 1;
7903 if ((warn_return_type || flag_isoc99)
7904 && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
7906 pedwarn_c99 (input_location, flag_isoc99 ? 0 : OPT_Wreturn_type,
7907 "%<return%> with no value, in "
7908 "function returning non-void");
7912 else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
7914 current_function_returns_null = 1;
7915 if (TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
7916 pedwarn (input_location, 0,
7917 "%<return%> with a value, in function returning void");
7919 pedwarn (input_location, OPT_pedantic, "ISO C forbids "
7920 "%<return%> with expression, in function returning void");
7924 tree t = convert_for_assignment (valtype, retval, origtype, ic_return,
7925 npc, NULL_TREE, NULL_TREE, 0);
7926 tree res = DECL_RESULT (current_function_decl);
7929 current_function_returns_value = 1;
7930 if (t == error_mark_node)
7933 inner = t = convert (TREE_TYPE (res), t);
7935 /* Strip any conversions, additions, and subtractions, and see if
7936 we are returning the address of a local variable. Warn if so. */
7939 switch (TREE_CODE (inner))
7942 case NON_LVALUE_EXPR:
7944 case POINTER_PLUS_EXPR:
7945 inner = TREE_OPERAND (inner, 0);
7949 /* If the second operand of the MINUS_EXPR has a pointer
7950 type (or is converted from it), this may be valid, so
7951 don't give a warning. */
7953 tree op1 = TREE_OPERAND (inner, 1);
7955 while (!POINTER_TYPE_P (TREE_TYPE (op1))
7956 && (CONVERT_EXPR_P (op1)
7957 || TREE_CODE (op1) == NON_LVALUE_EXPR))
7958 op1 = TREE_OPERAND (op1, 0);
7960 if (POINTER_TYPE_P (TREE_TYPE (op1)))
7963 inner = TREE_OPERAND (inner, 0);
7968 inner = TREE_OPERAND (inner, 0);
7970 while (REFERENCE_CLASS_P (inner)
7971 && TREE_CODE (inner) != INDIRECT_REF)
7972 inner = TREE_OPERAND (inner, 0);
7975 && !DECL_EXTERNAL (inner)
7976 && !TREE_STATIC (inner)
7977 && DECL_CONTEXT (inner) == current_function_decl)
7978 warning (0, "function returns address of local variable");
7988 retval = build2 (MODIFY_EXPR, TREE_TYPE (res), res, t);
7990 if (warn_sequence_point)
7991 verify_sequence_points (retval);
7994 ret_stmt = build_stmt (RETURN_EXPR, retval);
7995 TREE_NO_WARNING (ret_stmt) |= no_warning;
7996 return add_stmt (ret_stmt);
8000 /* The SWITCH_EXPR being built. */
8003 /* The original type of the testing expression, i.e. before the
8004 default conversion is applied. */
8007 /* A splay-tree mapping the low element of a case range to the high
8008 element, or NULL_TREE if there is no high element. Used to
8009 determine whether or not a new case label duplicates an old case
8010 label. We need a tree, rather than simply a hash table, because
8011 of the GNU case range extension. */
8014 /* Number of nested statement expressions within this switch
8015 statement; if nonzero, case and default labels may not
8017 unsigned int blocked_stmt_expr;
8019 /* Scope of outermost declarations of identifiers with variably
8020 modified type within this switch statement; if nonzero, case and
8021 default labels may not appear. */
8022 unsigned int blocked_vm;
8024 /* The next node on the stack. */
8025 struct c_switch *next;
8028 /* A stack of the currently active switch statements. The innermost
8029 switch statement is on the top of the stack. There is no need to
8030 mark the stack for garbage collection because it is only active
8031 during the processing of the body of a function, and we never
8032 collect at that point. */
8034 struct c_switch *c_switch_stack;
8036 /* Start a C switch statement, testing expression EXP. Return the new
8040 c_start_case (tree exp)
8042 tree orig_type = error_mark_node;
8043 struct c_switch *cs;
8045 if (exp != error_mark_node)
8047 orig_type = TREE_TYPE (exp);
8049 if (!INTEGRAL_TYPE_P (orig_type))
8051 if (orig_type != error_mark_node)
8053 error ("switch quantity not an integer");
8054 orig_type = error_mark_node;
8056 exp = integer_zero_node;
8060 tree type = TYPE_MAIN_VARIANT (orig_type);
8062 if (!in_system_header
8063 && (type == long_integer_type_node
8064 || type == long_unsigned_type_node))
8065 warning (OPT_Wtraditional, "%<long%> switch expression not "
8066 "converted to %<int%> in ISO C");
8068 exp = c_fully_fold (exp, false, NULL);
8069 exp = default_conversion (exp);
8071 if (warn_sequence_point)
8072 verify_sequence_points (exp);
8076 /* Add this new SWITCH_EXPR to the stack. */
8077 cs = XNEW (struct c_switch);
8078 cs->switch_expr = build3 (SWITCH_EXPR, orig_type, exp, NULL_TREE, NULL_TREE);
8079 cs->orig_type = orig_type;
8080 cs->cases = splay_tree_new (case_compare, NULL, NULL);
8081 cs->blocked_stmt_expr = 0;
8083 cs->next = c_switch_stack;
8084 c_switch_stack = cs;
8086 return add_stmt (cs->switch_expr);
8089 /* Process a case label. */
8092 do_case (tree low_value, tree high_value)
8094 tree label = NULL_TREE;
8096 if (low_value && TREE_CODE (low_value) != INTEGER_CST)
8098 low_value = c_fully_fold (low_value, false, NULL);
8099 if (TREE_CODE (low_value) == INTEGER_CST)
8100 pedwarn (input_location, OPT_pedantic,
8101 "case label is not an integer constant expression");
8104 if (high_value && TREE_CODE (high_value) != INTEGER_CST)
8106 high_value = c_fully_fold (high_value, false, NULL);
8107 if (TREE_CODE (high_value) == INTEGER_CST)
8108 pedwarn (input_location, OPT_pedantic,
8109 "case label is not an integer constant expression");
8112 if (c_switch_stack && !c_switch_stack->blocked_stmt_expr
8113 && !c_switch_stack->blocked_vm)
8115 label = c_add_case_label (c_switch_stack->cases,
8116 SWITCH_COND (c_switch_stack->switch_expr),
8117 c_switch_stack->orig_type,
8118 low_value, high_value);
8119 if (label == error_mark_node)
8122 else if (c_switch_stack && c_switch_stack->blocked_stmt_expr)
8125 error ("case label in statement expression not containing "
8126 "enclosing switch statement");
8128 error ("%<default%> label in statement expression not containing "
8129 "enclosing switch statement");
8131 else if (c_switch_stack && c_switch_stack->blocked_vm)
8134 error ("case label in scope of identifier with variably modified "
8135 "type not containing enclosing switch statement");
8137 error ("%<default%> label in scope of identifier with variably "
8138 "modified type not containing enclosing switch statement");
8141 error ("case label not within a switch statement");
8143 error ("%<default%> label not within a switch statement");
8148 /* Finish the switch statement. */
8151 c_finish_case (tree body)
8153 struct c_switch *cs = c_switch_stack;
8154 location_t switch_location;
8156 SWITCH_BODY (cs->switch_expr) = body;
8158 /* We must not be within a statement expression nested in the switch
8159 at this point; we might, however, be within the scope of an
8160 identifier with variably modified type nested in the switch. */
8161 gcc_assert (!cs->blocked_stmt_expr);
8163 /* Emit warnings as needed. */
8164 if (EXPR_HAS_LOCATION (cs->switch_expr))
8165 switch_location = EXPR_LOCATION (cs->switch_expr);
8167 switch_location = input_location;
8168 c_do_switch_warnings (cs->cases, switch_location,
8169 TREE_TYPE (cs->switch_expr),
8170 SWITCH_COND (cs->switch_expr));
8172 /* Pop the stack. */
8173 c_switch_stack = cs->next;
8174 splay_tree_delete (cs->cases);
8178 /* Emit an if statement. IF_LOCUS is the location of the 'if'. COND,
8179 THEN_BLOCK and ELSE_BLOCK are expressions to be used; ELSE_BLOCK
8180 may be null. NESTED_IF is true if THEN_BLOCK contains another IF
8181 statement, and was not surrounded with parenthesis. */
8184 c_finish_if_stmt (location_t if_locus, tree cond, tree then_block,
8185 tree else_block, bool nested_if)
8189 /* Diagnose an ambiguous else if if-then-else is nested inside if-then. */
8190 if (warn_parentheses && nested_if && else_block == NULL)
8192 tree inner_if = then_block;
8194 /* We know from the grammar productions that there is an IF nested
8195 within THEN_BLOCK. Due to labels and c99 conditional declarations,
8196 it might not be exactly THEN_BLOCK, but should be the last
8197 non-container statement within. */
8199 switch (TREE_CODE (inner_if))
8204 inner_if = BIND_EXPR_BODY (inner_if);
8206 case STATEMENT_LIST:
8207 inner_if = expr_last (then_block);
8209 case TRY_FINALLY_EXPR:
8210 case TRY_CATCH_EXPR:
8211 inner_if = TREE_OPERAND (inner_if, 0);
8218 if (COND_EXPR_ELSE (inner_if))
8219 warning (OPT_Wparentheses,
8220 "%Hsuggest explicit braces to avoid ambiguous %<else%>",
8224 stmt = build3 (COND_EXPR, void_type_node, cond, then_block, else_block);
8225 SET_EXPR_LOCATION (stmt, if_locus);
8229 /* Emit a general-purpose loop construct. START_LOCUS is the location of
8230 the beginning of the loop. COND is the loop condition. COND_IS_FIRST
8231 is false for DO loops. INCR is the FOR increment expression. BODY is
8232 the statement controlled by the loop. BLAB is the break label. CLAB is
8233 the continue label. Everything is allowed to be NULL. */
8236 c_finish_loop (location_t start_locus, tree cond, tree incr, tree body,
8237 tree blab, tree clab, bool cond_is_first)
8239 tree entry = NULL, exit = NULL, t;
8241 /* If the condition is zero don't generate a loop construct. */
8242 if (cond && integer_zerop (cond))
8246 t = build_and_jump (&blab);
8247 SET_EXPR_LOCATION (t, start_locus);
8253 tree top = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
8255 /* If we have an exit condition, then we build an IF with gotos either
8256 out of the loop, or to the top of it. If there's no exit condition,
8257 then we just build a jump back to the top. */
8258 exit = build_and_jump (&LABEL_EXPR_LABEL (top));
8260 if (cond && !integer_nonzerop (cond))
8262 /* Canonicalize the loop condition to the end. This means
8263 generating a branch to the loop condition. Reuse the
8264 continue label, if possible. */
8269 entry = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
8270 t = build_and_jump (&LABEL_EXPR_LABEL (entry));
8273 t = build1 (GOTO_EXPR, void_type_node, clab);
8274 SET_EXPR_LOCATION (t, start_locus);
8278 t = build_and_jump (&blab);
8279 exit = fold_build3 (COND_EXPR, void_type_node, cond, exit, t);
8281 SET_EXPR_LOCATION (exit, start_locus);
8283 SET_EXPR_LOCATION (exit, input_location);
8292 add_stmt (build1 (LABEL_EXPR, void_type_node, clab));
8300 add_stmt (build1 (LABEL_EXPR, void_type_node, blab));
8304 c_finish_bc_stmt (tree *label_p, bool is_break)
8307 tree label = *label_p;
8309 /* In switch statements break is sometimes stylistically used after
8310 a return statement. This can lead to spurious warnings about
8311 control reaching the end of a non-void function when it is
8312 inlined. Note that we are calling block_may_fallthru with
8313 language specific tree nodes; this works because
8314 block_may_fallthru returns true when given something it does not
8316 skip = !block_may_fallthru (cur_stmt_list);
8321 *label_p = label = create_artificial_label ();
8323 else if (TREE_CODE (label) == LABEL_DECL)
8325 else switch (TREE_INT_CST_LOW (label))
8329 error ("break statement not within loop or switch");
8331 error ("continue statement not within a loop");
8335 gcc_assert (is_break);
8336 error ("break statement used with OpenMP for loop");
8347 add_stmt (build_predict_expr (PRED_CONTINUE, NOT_TAKEN));
8349 return add_stmt (build1 (GOTO_EXPR, void_type_node, label));
8352 /* A helper routine for c_process_expr_stmt and c_finish_stmt_expr. */
8355 emit_side_effect_warnings (tree expr)
8357 if (expr == error_mark_node)
8359 else if (!TREE_SIDE_EFFECTS (expr))
8361 if (!VOID_TYPE_P (TREE_TYPE (expr)) && !TREE_NO_WARNING (expr))
8362 warning (OPT_Wunused_value, "%Hstatement with no effect",
8363 EXPR_HAS_LOCATION (expr) ? EXPR_LOCUS (expr) : &input_location);
8366 warn_if_unused_value (expr, input_location);
8369 /* Process an expression as if it were a complete statement. Emit
8370 diagnostics, but do not call ADD_STMT. */
8373 c_process_expr_stmt (tree expr)
8378 expr = c_fully_fold (expr, false, NULL);
8380 if (warn_sequence_point)
8381 verify_sequence_points (expr);
8383 if (TREE_TYPE (expr) != error_mark_node
8384 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
8385 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
8386 error ("expression statement has incomplete type");
8388 /* If we're not processing a statement expression, warn about unused values.
8389 Warnings for statement expressions will be emitted later, once we figure
8390 out which is the result. */
8391 if (!STATEMENT_LIST_STMT_EXPR (cur_stmt_list)
8392 && warn_unused_value)
8393 emit_side_effect_warnings (expr);
8395 /* If the expression is not of a type to which we cannot assign a line
8396 number, wrap the thing in a no-op NOP_EXPR. */
8397 if (DECL_P (expr) || CONSTANT_CLASS_P (expr))
8398 expr = build1 (NOP_EXPR, TREE_TYPE (expr), expr);
8400 if (CAN_HAVE_LOCATION_P (expr))
8401 SET_EXPR_LOCATION (expr, input_location);
8406 /* Emit an expression as a statement. */
8409 c_finish_expr_stmt (tree expr)
8412 return add_stmt (c_process_expr_stmt (expr));
8417 /* Do the opposite and emit a statement as an expression. To begin,
8418 create a new binding level and return it. */
8421 c_begin_stmt_expr (void)
8424 struct c_label_context_se *nstack;
8425 struct c_label_list *glist;
8427 /* We must force a BLOCK for this level so that, if it is not expanded
8428 later, there is a way to turn off the entire subtree of blocks that
8429 are contained in it. */
8431 ret = c_begin_compound_stmt (true);
8434 c_switch_stack->blocked_stmt_expr++;
8435 gcc_assert (c_switch_stack->blocked_stmt_expr != 0);
8437 for (glist = label_context_stack_se->labels_used;
8439 glist = glist->next)
8441 C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 1;
8443 nstack = XOBNEW (&parser_obstack, struct c_label_context_se);
8444 nstack->labels_def = NULL;
8445 nstack->labels_used = NULL;
8446 nstack->next = label_context_stack_se;
8447 label_context_stack_se = nstack;
8449 /* Mark the current statement list as belonging to a statement list. */
8450 STATEMENT_LIST_STMT_EXPR (ret) = 1;
8456 c_finish_stmt_expr (tree body)
8458 tree last, type, tmp, val;
8460 struct c_label_list *dlist, *glist, *glist_prev = NULL;
8462 body = c_end_compound_stmt (body, true);
8465 gcc_assert (c_switch_stack->blocked_stmt_expr != 0);
8466 c_switch_stack->blocked_stmt_expr--;
8468 /* It is no longer possible to jump to labels defined within this
8469 statement expression. */
8470 for (dlist = label_context_stack_se->labels_def;
8472 dlist = dlist->next)
8474 C_DECL_UNJUMPABLE_STMT_EXPR (dlist->label) = 1;
8476 /* It is again possible to define labels with a goto just outside
8477 this statement expression. */
8478 for (glist = label_context_stack_se->next->labels_used;
8480 glist = glist->next)
8482 C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 0;
8485 if (glist_prev != NULL)
8486 glist_prev->next = label_context_stack_se->labels_used;
8488 label_context_stack_se->next->labels_used
8489 = label_context_stack_se->labels_used;
8490 label_context_stack_se = label_context_stack_se->next;
8492 /* Locate the last statement in BODY. See c_end_compound_stmt
8493 about always returning a BIND_EXPR. */
8494 last_p = &BIND_EXPR_BODY (body);
8495 last = BIND_EXPR_BODY (body);
8498 if (TREE_CODE (last) == STATEMENT_LIST)
8500 tree_stmt_iterator i;
8502 /* This can happen with degenerate cases like ({ }). No value. */
8503 if (!TREE_SIDE_EFFECTS (last))
8506 /* If we're supposed to generate side effects warnings, process
8507 all of the statements except the last. */
8508 if (warn_unused_value)
8510 for (i = tsi_start (last); !tsi_one_before_end_p (i); tsi_next (&i))
8511 emit_side_effect_warnings (tsi_stmt (i));
8514 i = tsi_last (last);
8515 last_p = tsi_stmt_ptr (i);
8519 /* If the end of the list is exception related, then the list was split
8520 by a call to push_cleanup. Continue searching. */
8521 if (TREE_CODE (last) == TRY_FINALLY_EXPR
8522 || TREE_CODE (last) == TRY_CATCH_EXPR)
8524 last_p = &TREE_OPERAND (last, 0);
8526 goto continue_searching;
8529 /* In the case that the BIND_EXPR is not necessary, return the
8530 expression out from inside it. */
8531 if (last == error_mark_node
8532 || (last == BIND_EXPR_BODY (body)
8533 && BIND_EXPR_VARS (body) == NULL))
8535 /* Even if this looks constant, do not allow it in a constant
8537 last = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (last), NULL_TREE, last);
8538 C_MAYBE_CONST_EXPR_NON_CONST (last) = 1;
8539 /* Do not warn if the return value of a statement expression is
8541 TREE_NO_WARNING (last) = 1;
8545 /* Extract the type of said expression. */
8546 type = TREE_TYPE (last);
8548 /* If we're not returning a value at all, then the BIND_EXPR that
8549 we already have is a fine expression to return. */
8550 if (!type || VOID_TYPE_P (type))
8553 /* Now that we've located the expression containing the value, it seems
8554 silly to make voidify_wrapper_expr repeat the process. Create a
8555 temporary of the appropriate type and stick it in a TARGET_EXPR. */
8556 tmp = create_tmp_var_raw (type, NULL);
8558 /* Unwrap a no-op NOP_EXPR as added by c_finish_expr_stmt. This avoids
8559 tree_expr_nonnegative_p giving up immediately. */
8561 if (TREE_CODE (val) == NOP_EXPR
8562 && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)))
8563 val = TREE_OPERAND (val, 0);
8565 *last_p = build2 (MODIFY_EXPR, void_type_node, tmp, val);
8566 SET_EXPR_LOCUS (*last_p, EXPR_LOCUS (last));
8568 return build4 (TARGET_EXPR, type, tmp, body, NULL_TREE, NULL_TREE);
8571 /* Begin the scope of an identifier of variably modified type, scope
8572 number SCOPE. Jumping from outside this scope to inside it is not
8576 c_begin_vm_scope (unsigned int scope)
8578 struct c_label_context_vm *nstack;
8579 struct c_label_list *glist;
8581 gcc_assert (scope > 0);
8583 /* At file_scope, we don't have to do any processing. */
8584 if (label_context_stack_vm == NULL)
8587 if (c_switch_stack && !c_switch_stack->blocked_vm)
8588 c_switch_stack->blocked_vm = scope;
8589 for (glist = label_context_stack_vm->labels_used;
8591 glist = glist->next)
8593 C_DECL_UNDEFINABLE_VM (glist->label) = 1;
8595 nstack = XOBNEW (&parser_obstack, struct c_label_context_vm);
8596 nstack->labels_def = NULL;
8597 nstack->labels_used = NULL;
8598 nstack->scope = scope;
8599 nstack->next = label_context_stack_vm;
8600 label_context_stack_vm = nstack;
8603 /* End a scope which may contain identifiers of variably modified
8604 type, scope number SCOPE. */
8607 c_end_vm_scope (unsigned int scope)
8609 if (label_context_stack_vm == NULL)
8611 if (c_switch_stack && c_switch_stack->blocked_vm == scope)
8612 c_switch_stack->blocked_vm = 0;
8613 /* We may have a number of nested scopes of identifiers with
8614 variably modified type, all at this depth. Pop each in turn. */
8615 while (label_context_stack_vm->scope == scope)
8617 struct c_label_list *dlist, *glist, *glist_prev = NULL;
8619 /* It is no longer possible to jump to labels defined within this
8621 for (dlist = label_context_stack_vm->labels_def;
8623 dlist = dlist->next)
8625 C_DECL_UNJUMPABLE_VM (dlist->label) = 1;
8627 /* It is again possible to define labels with a goto just outside
8629 for (glist = label_context_stack_vm->next->labels_used;
8631 glist = glist->next)
8633 C_DECL_UNDEFINABLE_VM (glist->label) = 0;
8636 if (glist_prev != NULL)
8637 glist_prev->next = label_context_stack_vm->labels_used;
8639 label_context_stack_vm->next->labels_used
8640 = label_context_stack_vm->labels_used;
8641 label_context_stack_vm = label_context_stack_vm->next;
8645 /* Begin and end compound statements. This is as simple as pushing
8646 and popping new statement lists from the tree. */
8649 c_begin_compound_stmt (bool do_scope)
8651 tree stmt = push_stmt_list ();
8658 c_end_compound_stmt (tree stmt, bool do_scope)
8664 if (c_dialect_objc ())
8665 objc_clear_super_receiver ();
8666 block = pop_scope ();
8669 stmt = pop_stmt_list (stmt);
8670 stmt = c_build_bind_expr (block, stmt);
8672 /* If this compound statement is nested immediately inside a statement
8673 expression, then force a BIND_EXPR to be created. Otherwise we'll
8674 do the wrong thing for ({ { 1; } }) or ({ 1; { } }). In particular,
8675 STATEMENT_LISTs merge, and thus we can lose track of what statement
8678 && STATEMENT_LIST_STMT_EXPR (cur_stmt_list)
8679 && TREE_CODE (stmt) != BIND_EXPR)
8681 stmt = build3 (BIND_EXPR, void_type_node, NULL, stmt, NULL);
8682 TREE_SIDE_EFFECTS (stmt) = 1;
8688 /* Queue a cleanup. CLEANUP is an expression/statement to be executed
8689 when the current scope is exited. EH_ONLY is true when this is not
8690 meant to apply to normal control flow transfer. */
8693 push_cleanup (tree ARG_UNUSED (decl), tree cleanup, bool eh_only)
8695 enum tree_code code;
8699 code = eh_only ? TRY_CATCH_EXPR : TRY_FINALLY_EXPR;
8700 stmt = build_stmt (code, NULL, cleanup);
8702 stmt_expr = STATEMENT_LIST_STMT_EXPR (cur_stmt_list);
8703 list = push_stmt_list ();
8704 TREE_OPERAND (stmt, 0) = list;
8705 STATEMENT_LIST_STMT_EXPR (list) = stmt_expr;
8708 /* Build a binary-operation expression without default conversions.
8709 CODE is the kind of expression to build.
8710 LOCATION is the operator's location.
8711 This function differs from `build' in several ways:
8712 the data type of the result is computed and recorded in it,
8713 warnings are generated if arg data types are invalid,
8714 special handling for addition and subtraction of pointers is known,
8715 and some optimization is done (operations on narrow ints
8716 are done in the narrower type when that gives the same result).
8717 Constant folding is also done before the result is returned.
8719 Note that the operands will never have enumeral types, or function
8720 or array types, because either they will have the default conversions
8721 performed or they have both just been converted to some other type in which
8722 the arithmetic is to be done. */
8725 build_binary_op (location_t location, enum tree_code code,
8726 tree orig_op0, tree orig_op1, int convert_p)
8728 tree type0, type1, orig_type0, orig_type1;
8730 enum tree_code code0, code1;
8732 tree ret = error_mark_node;
8733 const char *invalid_op_diag;
8734 bool op0_int_operands, op1_int_operands;
8735 bool int_const, int_const_or_overflow, int_operands;
8737 /* Expression code to give to the expression when it is built.
8738 Normally this is CODE, which is what the caller asked for,
8739 but in some special cases we change it. */
8740 enum tree_code resultcode = code;
8742 /* Data type in which the computation is to be performed.
8743 In the simplest cases this is the common type of the arguments. */
8744 tree result_type = NULL;
8746 /* When the computation is in excess precision, the type of the
8747 final EXCESS_PRECISION_EXPR. */
8748 tree real_result_type = NULL;
8750 /* Nonzero means operands have already been type-converted
8751 in whatever way is necessary.
8752 Zero means they need to be converted to RESULT_TYPE. */
8755 /* Nonzero means create the expression with this type, rather than
8757 tree build_type = 0;
8759 /* Nonzero means after finally constructing the expression
8760 convert it to this type. */
8761 tree final_type = 0;
8763 /* Nonzero if this is an operation like MIN or MAX which can
8764 safely be computed in short if both args are promoted shorts.
8765 Also implies COMMON.
8766 -1 indicates a bitwise operation; this makes a difference
8767 in the exact conditions for when it is safe to do the operation
8768 in a narrower mode. */
8771 /* Nonzero if this is a comparison operation;
8772 if both args are promoted shorts, compare the original shorts.
8773 Also implies COMMON. */
8774 int short_compare = 0;
8776 /* Nonzero if this is a right-shift operation, which can be computed on the
8777 original short and then promoted if the operand is a promoted short. */
8778 int short_shift = 0;
8780 /* Nonzero means set RESULT_TYPE to the common type of the args. */
8783 /* True means types are compatible as far as ObjC is concerned. */
8786 /* True means this is an arithmetic operation that may need excess
8788 bool may_need_excess_precision;
8790 if (location == UNKNOWN_LOCATION)
8791 location = input_location;
8796 op0_int_operands = EXPR_INT_CONST_OPERANDS (orig_op0);
8797 if (op0_int_operands)
8798 op0 = remove_c_maybe_const_expr (op0);
8799 op1_int_operands = EXPR_INT_CONST_OPERANDS (orig_op1);
8800 if (op1_int_operands)
8801 op1 = remove_c_maybe_const_expr (op1);
8802 int_operands = (op0_int_operands && op1_int_operands);
8805 int_const_or_overflow = (TREE_CODE (orig_op0) == INTEGER_CST
8806 && TREE_CODE (orig_op1) == INTEGER_CST);
8807 int_const = (int_const_or_overflow
8808 && !TREE_OVERFLOW (orig_op0)
8809 && !TREE_OVERFLOW (orig_op1));
8812 int_const = int_const_or_overflow = false;
8816 op0 = default_conversion (op0);
8817 op1 = default_conversion (op1);
8820 orig_type0 = type0 = TREE_TYPE (op0);
8821 orig_type1 = type1 = TREE_TYPE (op1);
8823 /* The expression codes of the data types of the arguments tell us
8824 whether the arguments are integers, floating, pointers, etc. */
8825 code0 = TREE_CODE (type0);
8826 code1 = TREE_CODE (type1);
8828 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
8829 STRIP_TYPE_NOPS (op0);
8830 STRIP_TYPE_NOPS (op1);
8832 /* If an error was already reported for one of the arguments,
8833 avoid reporting another error. */
8835 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
8836 return error_mark_node;
8838 if ((invalid_op_diag
8839 = targetm.invalid_binary_op (code, type0, type1)))
8841 error_at (location, invalid_op_diag);
8842 return error_mark_node;
8850 case TRUNC_DIV_EXPR:
8852 case FLOOR_DIV_EXPR:
8853 case ROUND_DIV_EXPR:
8854 case EXACT_DIV_EXPR:
8855 may_need_excess_precision = true;
8858 may_need_excess_precision = false;
8861 if (TREE_CODE (op0) == EXCESS_PRECISION_EXPR)
8863 op0 = TREE_OPERAND (op0, 0);
8864 type0 = TREE_TYPE (op0);
8866 else if (may_need_excess_precision
8867 && (eptype = excess_precision_type (type0)) != NULL_TREE)
8870 op0 = convert (eptype, op0);
8872 if (TREE_CODE (op1) == EXCESS_PRECISION_EXPR)
8874 op1 = TREE_OPERAND (op1, 0);
8875 type1 = TREE_TYPE (op1);
8877 else if (may_need_excess_precision
8878 && (eptype = excess_precision_type (type1)) != NULL_TREE)
8881 op1 = convert (eptype, op1);
8884 objc_ok = objc_compare_types (type0, type1, -3, NULL_TREE);
8889 /* Handle the pointer + int case. */
8890 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
8892 ret = pointer_int_sum (PLUS_EXPR, op0, op1);
8893 goto return_build_binary_op;
8895 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
8897 ret = pointer_int_sum (PLUS_EXPR, op1, op0);
8898 goto return_build_binary_op;
8905 /* Subtraction of two similar pointers.
8906 We must subtract them as integers, then divide by object size. */
8907 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
8908 && comp_target_types (type0, type1))
8910 ret = pointer_diff (op0, op1);
8911 goto return_build_binary_op;
8913 /* Handle pointer minus int. Just like pointer plus int. */
8914 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
8916 ret = pointer_int_sum (MINUS_EXPR, op0, op1);
8917 goto return_build_binary_op;
8927 case TRUNC_DIV_EXPR:
8929 case FLOOR_DIV_EXPR:
8930 case ROUND_DIV_EXPR:
8931 case EXACT_DIV_EXPR:
8932 warn_for_div_by_zero (location, op1);
8934 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
8935 || code0 == FIXED_POINT_TYPE
8936 || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
8937 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
8938 || code1 == FIXED_POINT_TYPE
8939 || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE))
8941 enum tree_code tcode0 = code0, tcode1 = code1;
8943 if (code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE)
8944 tcode0 = TREE_CODE (TREE_TYPE (TREE_TYPE (op0)));
8945 if (code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)
8946 tcode1 = TREE_CODE (TREE_TYPE (TREE_TYPE (op1)));
8948 if (!((tcode0 == INTEGER_TYPE && tcode1 == INTEGER_TYPE)
8949 || (tcode0 == FIXED_POINT_TYPE && tcode1 == FIXED_POINT_TYPE)))
8950 resultcode = RDIV_EXPR;
8952 /* Although it would be tempting to shorten always here, that
8953 loses on some targets, since the modulo instruction is
8954 undefined if the quotient can't be represented in the
8955 computation mode. We shorten only if unsigned or if
8956 dividing by something we know != -1. */
8957 shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0))
8958 || (TREE_CODE (op1) == INTEGER_CST
8959 && !integer_all_onesp (op1)));
8967 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
8969 /* Allow vector types which are not floating point types. */
8970 else if (code0 == VECTOR_TYPE
8971 && code1 == VECTOR_TYPE
8972 && !VECTOR_FLOAT_TYPE_P (type0)
8973 && !VECTOR_FLOAT_TYPE_P (type1))
8977 case TRUNC_MOD_EXPR:
8978 case FLOOR_MOD_EXPR:
8979 warn_for_div_by_zero (location, op1);
8981 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
8983 /* Although it would be tempting to shorten always here, that loses
8984 on some targets, since the modulo instruction is undefined if the
8985 quotient can't be represented in the computation mode. We shorten
8986 only if unsigned or if dividing by something we know != -1. */
8987 shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0))
8988 || (TREE_CODE (op1) == INTEGER_CST
8989 && !integer_all_onesp (op1)));
8994 case TRUTH_ANDIF_EXPR:
8995 case TRUTH_ORIF_EXPR:
8996 case TRUTH_AND_EXPR:
8998 case TRUTH_XOR_EXPR:
8999 if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
9000 || code0 == REAL_TYPE || code0 == COMPLEX_TYPE
9001 || code0 == FIXED_POINT_TYPE)
9002 && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
9003 || code1 == REAL_TYPE || code1 == COMPLEX_TYPE
9004 || code1 == FIXED_POINT_TYPE))
9006 /* Result of these operations is always an int,
9007 but that does not mean the operands should be
9008 converted to ints! */
9009 result_type = integer_type_node;
9010 op0 = c_common_truthvalue_conversion (location, op0);
9011 op1 = c_common_truthvalue_conversion (location, op1);
9014 if (code == TRUTH_ANDIF_EXPR)
9016 int_const_or_overflow = (int_operands
9017 && TREE_CODE (orig_op0) == INTEGER_CST
9018 && (op0 == truthvalue_false_node
9019 || TREE_CODE (orig_op1) == INTEGER_CST));
9020 int_const = (int_const_or_overflow
9021 && !TREE_OVERFLOW (orig_op0)
9022 && (op0 == truthvalue_false_node
9023 || !TREE_OVERFLOW (orig_op1)));
9025 else if (code == TRUTH_ORIF_EXPR)
9027 int_const_or_overflow = (int_operands
9028 && TREE_CODE (orig_op0) == INTEGER_CST
9029 && (op0 == truthvalue_true_node
9030 || TREE_CODE (orig_op1) == INTEGER_CST));
9031 int_const = (int_const_or_overflow
9032 && !TREE_OVERFLOW (orig_op0)
9033 && (op0 == truthvalue_true_node
9034 || !TREE_OVERFLOW (orig_op1)));
9038 /* Shift operations: result has same type as first operand;
9039 always convert second operand to int.
9040 Also set SHORT_SHIFT if shifting rightward. */
9043 if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE)
9044 && code1 == INTEGER_TYPE)
9046 if (TREE_CODE (op1) == INTEGER_CST)
9048 if (tree_int_cst_sgn (op1) < 0)
9051 if (skip_evaluation == 0)
9052 warning (0, "right shift count is negative");
9056 if (!integer_zerop (op1))
9059 if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
9062 if (skip_evaluation == 0)
9063 warning (0, "right shift count >= width of type");
9068 /* Use the type of the value to be shifted. */
9069 result_type = type0;
9070 /* Convert the shift-count to an integer, regardless of size
9071 of value being shifted. */
9072 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
9073 op1 = convert (integer_type_node, op1);
9074 /* Avoid converting op1 to result_type later. */
9080 if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE)
9081 && code1 == INTEGER_TYPE)
9083 if (TREE_CODE (op1) == INTEGER_CST)
9085 if (tree_int_cst_sgn (op1) < 0)
9088 if (skip_evaluation == 0)
9089 warning (0, "left shift count is negative");
9092 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
9095 if (skip_evaluation == 0)
9096 warning (0, "left shift count >= width of type");
9100 /* Use the type of the value to be shifted. */
9101 result_type = type0;
9102 /* Convert the shift-count to an integer, regardless of size
9103 of value being shifted. */
9104 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
9105 op1 = convert (integer_type_node, op1);
9106 /* Avoid converting op1 to result_type later. */
9113 if (FLOAT_TYPE_P (type0) || FLOAT_TYPE_P (type1))
9114 warning_at (location,
9116 "comparing floating point with == or != is unsafe");
9117 /* Result of comparison is always int,
9118 but don't convert the args to int! */
9119 build_type = integer_type_node;
9120 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
9121 || code0 == FIXED_POINT_TYPE || code0 == COMPLEX_TYPE)
9122 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
9123 || code1 == FIXED_POINT_TYPE || code1 == COMPLEX_TYPE))
9125 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
9127 tree tt0 = TREE_TYPE (type0);
9128 tree tt1 = TREE_TYPE (type1);
9129 /* Anything compares with void *. void * compares with anything.
9130 Otherwise, the targets must be compatible
9131 and both must be object or both incomplete. */
9132 if (comp_target_types (type0, type1))
9133 result_type = common_pointer_type (type0, type1);
9134 else if (VOID_TYPE_P (tt0))
9136 /* op0 != orig_op0 detects the case of something
9137 whose value is 0 but which isn't a valid null ptr const. */
9138 if (pedantic && !null_pointer_constant_p (orig_op0)
9139 && TREE_CODE (tt1) == FUNCTION_TYPE)
9140 pedwarn (location, OPT_pedantic, "ISO C forbids "
9141 "comparison of %<void *%> with function pointer");
9143 else if (VOID_TYPE_P (tt1))
9145 if (pedantic && !null_pointer_constant_p (orig_op1)
9146 && TREE_CODE (tt0) == FUNCTION_TYPE)
9147 pedwarn (location, OPT_pedantic, "ISO C forbids "
9148 "comparison of %<void *%> with function pointer");
9151 /* Avoid warning about the volatile ObjC EH puts on decls. */
9153 pedwarn (location, 0,
9154 "comparison of distinct pointer types lacks a cast");
9156 if (result_type == NULL_TREE)
9157 result_type = ptr_type_node;
9159 else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1))
9161 if (TREE_CODE (op0) == ADDR_EXPR
9162 && decl_with_nonnull_addr_p (TREE_OPERAND (op0, 0)))
9163 warning_at (location,
9164 OPT_Waddress, "the address of %qD will never be NULL",
9165 TREE_OPERAND (op0, 0));
9166 result_type = type0;
9168 else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0))
9170 if (TREE_CODE (op1) == ADDR_EXPR
9171 && decl_with_nonnull_addr_p (TREE_OPERAND (op1, 0)))
9172 warning_at (location,
9173 OPT_Waddress, "the address of %qD will never be NULL",
9174 TREE_OPERAND (op1, 0));
9175 result_type = type1;
9177 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
9179 result_type = type0;
9180 pedwarn (location, 0, "comparison between pointer and integer");
9182 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
9184 result_type = type1;
9185 pedwarn (location, 0, "comparison between pointer and integer");
9193 build_type = integer_type_node;
9194 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
9195 || code0 == FIXED_POINT_TYPE)
9196 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
9197 || code1 == FIXED_POINT_TYPE))
9199 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
9201 if (comp_target_types (type0, type1))
9203 result_type = common_pointer_type (type0, type1);
9204 if (!COMPLETE_TYPE_P (TREE_TYPE (type0))
9205 != !COMPLETE_TYPE_P (TREE_TYPE (type1)))
9206 pedwarn (location, 0,
9207 "comparison of complete and incomplete pointers");
9208 else if (TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
9209 pedwarn (location, OPT_pedantic, "ISO C forbids "
9210 "ordered comparisons of pointers to functions");
9214 result_type = ptr_type_node;
9215 pedwarn (location, 0,
9216 "comparison of distinct pointer types lacks a cast");
9219 else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1))
9221 result_type = type0;
9223 pedwarn (location, OPT_pedantic,
9224 "ordered comparison of pointer with integer zero");
9225 else if (extra_warnings)
9226 warning_at (location, OPT_Wextra,
9227 "ordered comparison of pointer with integer zero");
9229 else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0))
9231 result_type = type1;
9232 pedwarn (location, OPT_pedantic,
9233 "ordered comparison of pointer with integer zero");
9235 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
9237 result_type = type0;
9238 pedwarn (location, 0, "comparison between pointer and integer");
9240 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
9242 result_type = type1;
9243 pedwarn (location, 0, "comparison between pointer and integer");
9251 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
9252 return error_mark_node;
9254 if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE
9255 && (!tree_int_cst_equal (TYPE_SIZE (type0), TYPE_SIZE (type1))
9256 || !same_scalar_type_ignoring_signedness (TREE_TYPE (type0),
9257 TREE_TYPE (type1))))
9259 binary_op_error (location, code, type0, type1);
9260 return error_mark_node;
9263 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE
9264 || code0 == FIXED_POINT_TYPE || code0 == VECTOR_TYPE)
9266 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE
9267 || code1 == FIXED_POINT_TYPE || code1 == VECTOR_TYPE))
9269 bool first_complex = (code0 == COMPLEX_TYPE);
9270 bool second_complex = (code1 == COMPLEX_TYPE);
9271 int none_complex = (!first_complex && !second_complex);
9273 if (shorten || common || short_compare)
9275 result_type = c_common_type (type0, type1);
9276 if (result_type == error_mark_node)
9277 return error_mark_node;
9280 if (first_complex != second_complex
9281 && (code == PLUS_EXPR
9282 || code == MINUS_EXPR
9283 || code == MULT_EXPR
9284 || (code == TRUNC_DIV_EXPR && first_complex))
9285 && TREE_CODE (TREE_TYPE (result_type)) == REAL_TYPE
9286 && flag_signed_zeros)
9288 /* An operation on mixed real/complex operands must be
9289 handled specially, but the language-independent code can
9290 more easily optimize the plain complex arithmetic if
9291 -fno-signed-zeros. */
9292 tree real_type = TREE_TYPE (result_type);
9294 if (type0 != orig_type0 || type1 != orig_type1)
9296 gcc_assert (may_need_excess_precision && common);
9297 real_result_type = c_common_type (orig_type0, orig_type1);
9301 if (TREE_TYPE (op0) != result_type)
9302 op0 = convert_and_check (result_type, op0);
9303 if (TREE_TYPE (op1) != real_type)
9304 op1 = convert_and_check (real_type, op1);
9308 if (TREE_TYPE (op0) != real_type)
9309 op0 = convert_and_check (real_type, op0);
9310 if (TREE_TYPE (op1) != result_type)
9311 op1 = convert_and_check (result_type, op1);
9313 if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK)
9314 return error_mark_node;
9317 op0 = c_save_expr (op0);
9318 real = build_unary_op (EXPR_LOCATION (orig_op0), REALPART_EXPR,
9320 imag = build_unary_op (EXPR_LOCATION (orig_op0), IMAGPART_EXPR,
9325 case TRUNC_DIV_EXPR:
9326 imag = build2 (resultcode, real_type, imag, op1);
9330 real = build2 (resultcode, real_type, real, op1);
9338 op1 = c_save_expr (op1);
9339 real = build_unary_op (EXPR_LOCATION (orig_op1), REALPART_EXPR,
9341 imag = build_unary_op (EXPR_LOCATION (orig_op1), IMAGPART_EXPR,
9346 imag = build2 (resultcode, real_type, op0, imag);
9349 real = build2 (resultcode, real_type, op0, real);
9352 real = build2 (resultcode, real_type, op0, real);
9353 imag = build1 (NEGATE_EXPR, real_type, imag);
9359 ret = build2 (COMPLEX_EXPR, result_type, real, imag);
9360 goto return_build_binary_op;
9363 /* For certain operations (which identify themselves by shorten != 0)
9364 if both args were extended from the same smaller type,
9365 do the arithmetic in that type and then extend.
9367 shorten !=0 and !=1 indicates a bitwise operation.
9368 For them, this optimization is safe only if
9369 both args are zero-extended or both are sign-extended.
9370 Otherwise, we might change the result.
9371 Eg, (short)-1 | (unsigned short)-1 is (int)-1
9372 but calculated in (unsigned short) it would be (unsigned short)-1. */
9374 if (shorten && none_complex)
9376 final_type = result_type;
9377 result_type = shorten_binary_op (result_type, op0, op1,
9381 /* Shifts can be shortened if shifting right. */
9386 tree arg0 = get_narrower (op0, &unsigned_arg);
9388 final_type = result_type;
9390 if (arg0 == op0 && final_type == TREE_TYPE (op0))
9391 unsigned_arg = TYPE_UNSIGNED (TREE_TYPE (op0));
9393 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
9394 /* We can shorten only if the shift count is less than the
9395 number of bits in the smaller type size. */
9396 && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
9397 /* We cannot drop an unsigned shift after sign-extension. */
9398 && (!TYPE_UNSIGNED (final_type) || unsigned_arg))
9400 /* Do an unsigned shift if the operand was zero-extended. */
9402 = c_common_signed_or_unsigned_type (unsigned_arg,
9404 /* Convert value-to-be-shifted to that type. */
9405 if (TREE_TYPE (op0) != result_type)
9406 op0 = convert (result_type, op0);
9411 /* Comparison operations are shortened too but differently.
9412 They identify themselves by setting short_compare = 1. */
9416 /* Don't write &op0, etc., because that would prevent op0
9417 from being kept in a register.
9418 Instead, make copies of the our local variables and
9419 pass the copies by reference, then copy them back afterward. */
9420 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
9421 enum tree_code xresultcode = resultcode;
9423 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
9428 goto return_build_binary_op;
9431 op0 = xop0, op1 = xop1;
9433 resultcode = xresultcode;
9435 if (!skip_evaluation)
9437 bool op0_maybe_const = true;
9438 bool op1_maybe_const = true;
9439 tree orig_op0_folded, orig_op1_folded;
9441 if (in_late_binary_op)
9443 orig_op0_folded = orig_op0;
9444 orig_op1_folded = orig_op1;
9448 /* Fold for the sake of possible warnings, as in
9449 build_conditional_expr. This requires the
9450 "original" values to be folded, not just op0 and
9452 op0 = c_fully_fold (op0, require_constant_value,
9454 op1 = c_fully_fold (op1, require_constant_value,
9456 orig_op0_folded = c_fully_fold (orig_op0,
9457 require_constant_value,
9459 orig_op1_folded = c_fully_fold (orig_op1,
9460 require_constant_value,
9464 if (warn_sign_compare)
9465 warn_for_sign_compare (location, orig_op0_folded,
9466 orig_op1_folded, op0, op1,
9467 result_type, resultcode);
9468 if (!in_late_binary_op)
9470 if (!op0_maybe_const || TREE_CODE (op0) != INTEGER_CST)
9472 op0 = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (op0),
9474 C_MAYBE_CONST_EXPR_NON_CONST (op0) = !op0_maybe_const;
9476 if (!op1_maybe_const || TREE_CODE (op1) != INTEGER_CST)
9478 op1 = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (op1),
9480 C_MAYBE_CONST_EXPR_NON_CONST (op1) = !op1_maybe_const;
9487 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
9488 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
9489 Then the expression will be built.
9490 It will be given type FINAL_TYPE if that is nonzero;
9491 otherwise, it will be given type RESULT_TYPE. */
9495 binary_op_error (location, code, TREE_TYPE (op0), TREE_TYPE (op1));
9496 return error_mark_node;
9501 if (TREE_TYPE (op0) != result_type)
9502 op0 = convert_and_check (result_type, op0);
9503 if (TREE_TYPE (op1) != result_type)
9504 op1 = convert_and_check (result_type, op1);
9506 /* This can happen if one operand has a vector type, and the other
9507 has a different type. */
9508 if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK)
9509 return error_mark_node;
9512 if (build_type == NULL_TREE)
9514 build_type = result_type;
9515 if (type0 != orig_type0 || type1 != orig_type1)
9517 gcc_assert (may_need_excess_precision && common);
9518 real_result_type = c_common_type (orig_type0, orig_type1);
9522 /* Treat expressions in initializers specially as they can't trap. */
9523 if (int_const_or_overflow)
9524 ret = (require_constant_value
9525 ? fold_build2_initializer (resultcode, build_type, op0, op1)
9526 : fold_build2 (resultcode, build_type, op0, op1));
9528 ret = build2 (resultcode, build_type, op0, op1);
9529 if (final_type != 0)
9530 ret = convert (final_type, ret);
9532 return_build_binary_op:
9533 gcc_assert (ret != error_mark_node);
9534 if (TREE_CODE (ret) == INTEGER_CST && !TREE_OVERFLOW (ret) && !int_const)
9536 ? note_integer_operands (ret)
9537 : build1 (NOP_EXPR, TREE_TYPE (ret), ret));
9538 else if (TREE_CODE (ret) != INTEGER_CST && int_operands
9539 && !in_late_binary_op)
9540 ret = note_integer_operands (ret);
9541 if (real_result_type)
9542 ret = build1 (EXCESS_PRECISION_EXPR, real_result_type, ret);
9543 protected_set_expr_location (ret, location);
9548 /* Convert EXPR to be a truth-value, validating its type for this
9549 purpose. LOCATION is the source location for the expression. */
9552 c_objc_common_truthvalue_conversion (location_t location, tree expr)
9554 bool int_const, int_operands;
9556 switch (TREE_CODE (TREE_TYPE (expr)))
9559 error_at (location, "used array that cannot be converted to pointer where scalar is required");
9560 return error_mark_node;
9563 error_at (location, "used struct type value where scalar is required");
9564 return error_mark_node;
9567 error_at (location, "used union type value where scalar is required");
9568 return error_mark_node;
9577 int_const = (TREE_CODE (expr) == INTEGER_CST && !TREE_OVERFLOW (expr));
9578 int_operands = EXPR_INT_CONST_OPERANDS (expr);
9580 expr = remove_c_maybe_const_expr (expr);
9582 /* ??? Should we also give an error for void and vectors rather than
9583 leaving those to give errors later? */
9584 expr = c_common_truthvalue_conversion (location, expr);
9586 if (TREE_CODE (expr) == INTEGER_CST && int_operands && !int_const)
9588 if (TREE_OVERFLOW (expr))
9591 return note_integer_operands (expr);
9593 if (TREE_CODE (expr) == INTEGER_CST && !int_const)
9594 return build1 (NOP_EXPR, TREE_TYPE (expr), expr);
9599 /* Convert EXPR to a contained DECL, updating *TC, *TI and *SE as
9603 c_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se)
9605 if (TREE_CODE (expr) == COMPOUND_LITERAL_EXPR)
9607 tree decl = COMPOUND_LITERAL_EXPR_DECL (expr);
9608 /* Executing a compound literal inside a function reinitializes
9610 if (!TREE_STATIC (decl))
9618 /* Like c_begin_compound_stmt, except force the retention of the BLOCK. */
9621 c_begin_omp_parallel (void)
9626 block = c_begin_compound_stmt (true);
9631 /* Generate OMP_PARALLEL, with CLAUSES and BLOCK as its compound statement. */
9634 c_finish_omp_parallel (tree clauses, tree block)
9638 block = c_end_compound_stmt (block, true);
9640 stmt = make_node (OMP_PARALLEL);
9641 TREE_TYPE (stmt) = void_type_node;
9642 OMP_PARALLEL_CLAUSES (stmt) = clauses;
9643 OMP_PARALLEL_BODY (stmt) = block;
9645 return add_stmt (stmt);
9648 /* Like c_begin_compound_stmt, except force the retention of the BLOCK. */
9651 c_begin_omp_task (void)
9656 block = c_begin_compound_stmt (true);
9661 /* Generate OMP_TASK, with CLAUSES and BLOCK as its compound statement. */
9664 c_finish_omp_task (tree clauses, tree block)
9668 block = c_end_compound_stmt (block, true);
9670 stmt = make_node (OMP_TASK);
9671 TREE_TYPE (stmt) = void_type_node;
9672 OMP_TASK_CLAUSES (stmt) = clauses;
9673 OMP_TASK_BODY (stmt) = block;
9675 return add_stmt (stmt);
9678 /* For all elements of CLAUSES, validate them vs OpenMP constraints.
9679 Remove any elements from the list that are invalid. */
9682 c_finish_omp_clauses (tree clauses)
9684 bitmap_head generic_head, firstprivate_head, lastprivate_head;
9685 tree c, t, *pc = &clauses;
9688 bitmap_obstack_initialize (NULL);
9689 bitmap_initialize (&generic_head, &bitmap_default_obstack);
9690 bitmap_initialize (&firstprivate_head, &bitmap_default_obstack);
9691 bitmap_initialize (&lastprivate_head, &bitmap_default_obstack);
9693 for (pc = &clauses, c = clauses; c ; c = *pc)
9695 bool remove = false;
9696 bool need_complete = false;
9697 bool need_implicitly_determined = false;
9699 switch (OMP_CLAUSE_CODE (c))
9701 case OMP_CLAUSE_SHARED:
9703 need_implicitly_determined = true;
9704 goto check_dup_generic;
9706 case OMP_CLAUSE_PRIVATE:
9708 need_complete = true;
9709 need_implicitly_determined = true;
9710 goto check_dup_generic;
9712 case OMP_CLAUSE_REDUCTION:
9714 need_implicitly_determined = true;
9715 t = OMP_CLAUSE_DECL (c);
9716 if (AGGREGATE_TYPE_P (TREE_TYPE (t))
9717 || POINTER_TYPE_P (TREE_TYPE (t)))
9719 error ("%qE has invalid type for %<reduction%>", t);
9722 else if (FLOAT_TYPE_P (TREE_TYPE (t)))
9724 enum tree_code r_code = OMP_CLAUSE_REDUCTION_CODE (c);
9725 const char *r_name = NULL;
9742 case TRUTH_ANDIF_EXPR:
9745 case TRUTH_ORIF_EXPR:
9753 error ("%qE has invalid type for %<reduction(%s)%>",
9758 goto check_dup_generic;
9760 case OMP_CLAUSE_COPYPRIVATE:
9761 name = "copyprivate";
9762 goto check_dup_generic;
9764 case OMP_CLAUSE_COPYIN:
9766 t = OMP_CLAUSE_DECL (c);
9767 if (TREE_CODE (t) != VAR_DECL || !DECL_THREAD_LOCAL_P (t))
9769 error ("%qE must be %<threadprivate%> for %<copyin%>", t);
9772 goto check_dup_generic;
9775 t = OMP_CLAUSE_DECL (c);
9776 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
9778 error ("%qE is not a variable in clause %qs", t, name);
9781 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
9782 || bitmap_bit_p (&firstprivate_head, DECL_UID (t))
9783 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
9785 error ("%qE appears more than once in data clauses", t);
9789 bitmap_set_bit (&generic_head, DECL_UID (t));
9792 case OMP_CLAUSE_FIRSTPRIVATE:
9793 name = "firstprivate";
9794 t = OMP_CLAUSE_DECL (c);
9795 need_complete = true;
9796 need_implicitly_determined = true;
9797 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
9799 error ("%qE is not a variable in clause %<firstprivate%>", t);
9802 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
9803 || bitmap_bit_p (&firstprivate_head, DECL_UID (t)))
9805 error ("%qE appears more than once in data clauses", t);
9809 bitmap_set_bit (&firstprivate_head, DECL_UID (t));
9812 case OMP_CLAUSE_LASTPRIVATE:
9813 name = "lastprivate";
9814 t = OMP_CLAUSE_DECL (c);
9815 need_complete = true;
9816 need_implicitly_determined = true;
9817 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL)
9819 error ("%qE is not a variable in clause %<lastprivate%>", t);
9822 else if (bitmap_bit_p (&generic_head, DECL_UID (t))
9823 || bitmap_bit_p (&lastprivate_head, DECL_UID (t)))
9825 error ("%qE appears more than once in data clauses", t);
9829 bitmap_set_bit (&lastprivate_head, DECL_UID (t));
9833 case OMP_CLAUSE_NUM_THREADS:
9834 case OMP_CLAUSE_SCHEDULE:
9835 case OMP_CLAUSE_NOWAIT:
9836 case OMP_CLAUSE_ORDERED:
9837 case OMP_CLAUSE_DEFAULT:
9838 case OMP_CLAUSE_UNTIED:
9839 case OMP_CLAUSE_COLLAPSE:
9840 pc = &OMP_CLAUSE_CHAIN (c);
9849 t = OMP_CLAUSE_DECL (c);
9853 t = require_complete_type (t);
9854 if (t == error_mark_node)
9858 if (need_implicitly_determined)
9860 const char *share_name = NULL;
9862 if (TREE_CODE (t) == VAR_DECL && DECL_THREAD_LOCAL_P (t))
9863 share_name = "threadprivate";
9864 else switch (c_omp_predetermined_sharing (t))
9866 case OMP_CLAUSE_DEFAULT_UNSPECIFIED:
9868 case OMP_CLAUSE_DEFAULT_SHARED:
9869 share_name = "shared";
9871 case OMP_CLAUSE_DEFAULT_PRIVATE:
9872 share_name = "private";
9879 error ("%qE is predetermined %qs for %qs",
9880 t, share_name, name);
9887 *pc = OMP_CLAUSE_CHAIN (c);
9889 pc = &OMP_CLAUSE_CHAIN (c);
9892 bitmap_obstack_release (NULL);
9896 /* Make a variant type in the proper way for C/C++, propagating qualifiers
9897 down to the element type of an array. */
9900 c_build_qualified_type (tree type, int type_quals)
9902 if (type == error_mark_node)
9905 if (TREE_CODE (type) == ARRAY_TYPE)
9908 tree element_type = c_build_qualified_type (TREE_TYPE (type),
9911 /* See if we already have an identically qualified type. */
9912 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9914 if (TYPE_QUALS (strip_array_types (t)) == type_quals
9915 && TYPE_NAME (t) == TYPE_NAME (type)
9916 && TYPE_CONTEXT (t) == TYPE_CONTEXT (type)
9917 && attribute_list_equal (TYPE_ATTRIBUTES (t),
9918 TYPE_ATTRIBUTES (type)))
9923 tree domain = TYPE_DOMAIN (type);
9925 t = build_variant_type_copy (type);
9926 TREE_TYPE (t) = element_type;
9928 if (TYPE_STRUCTURAL_EQUALITY_P (element_type)
9929 || (domain && TYPE_STRUCTURAL_EQUALITY_P (domain)))
9930 SET_TYPE_STRUCTURAL_EQUALITY (t);
9931 else if (TYPE_CANONICAL (element_type) != element_type
9932 || (domain && TYPE_CANONICAL (domain) != domain))
9934 tree unqualified_canon
9935 = build_array_type (TYPE_CANONICAL (element_type),
9936 domain? TYPE_CANONICAL (domain)
9939 = c_build_qualified_type (unqualified_canon, type_quals);
9942 TYPE_CANONICAL (t) = t;
9947 /* A restrict-qualified pointer type must be a pointer to object or
9948 incomplete type. Note that the use of POINTER_TYPE_P also allows
9949 REFERENCE_TYPEs, which is appropriate for C++. */
9950 if ((type_quals & TYPE_QUAL_RESTRICT)
9951 && (!POINTER_TYPE_P (type)
9952 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
9954 error ("invalid use of %<restrict%>");
9955 type_quals &= ~TYPE_QUAL_RESTRICT;
9958 return build_qualified_type (type, type_quals);