1 /* Build expressions with type checking for C compiler.
2 Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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.
28 There are also routines to build RETURN_STMT nodes and CASE_STMT nodes,
29 and to process initializations in declarations (since they work
30 like a strange sort of assignment). */
45 /* Nonzero if we've already printed a "missing braces around initializer"
46 message within this initializer. */
47 static int missing_braces_mentioned;
49 /* 1 if we explained undeclared var errors. */
50 static int undeclared_variable_notice;
52 static tree qualify_type PARAMS ((tree, tree));
53 static int comp_target_types PARAMS ((tree, tree));
54 static int function_types_compatible_p PARAMS ((tree, tree));
55 static int type_lists_compatible_p PARAMS ((tree, tree));
56 static tree decl_constant_value_for_broken_optimization PARAMS ((tree));
57 static tree lookup_field PARAMS ((tree, tree, tree *));
58 static tree convert_arguments PARAMS ((tree, tree, tree, tree));
59 static tree pointer_int_sum PARAMS ((enum tree_code, tree, tree));
60 static tree pointer_diff PARAMS ((tree, tree));
61 static tree unary_complex_lvalue PARAMS ((enum tree_code, tree));
62 static void pedantic_lvalue_warning PARAMS ((enum tree_code));
63 static tree internal_build_compound_expr PARAMS ((tree, int));
64 static tree convert_for_assignment PARAMS ((tree, tree, const char *,
66 static void warn_for_assignment PARAMS ((const char *, const char *,
68 static tree valid_compound_expr_initializer PARAMS ((tree, tree));
69 static void push_string PARAMS ((const char *));
70 static void push_member_name PARAMS ((tree));
71 static void push_array_bounds PARAMS ((int));
72 static int spelling_length PARAMS ((void));
73 static char *print_spelling PARAMS ((char *));
74 static void warning_init PARAMS ((const char *));
75 static tree digest_init PARAMS ((tree, tree, int, int));
76 static void output_init_element PARAMS ((tree, tree, tree, int));
77 static void output_pending_init_elements PARAMS ((int));
78 static int set_designator PARAMS ((int));
79 static void push_range_stack PARAMS ((tree));
80 static void add_pending_init PARAMS ((tree, tree));
81 static void set_nonincremental_init PARAMS ((void));
82 static void set_nonincremental_init_from_string PARAMS ((tree));
83 static tree find_init_member PARAMS ((tree));
85 /* Do `exp = require_complete_type (exp);' to make sure exp
86 does not have an incomplete type. (That includes void types.) */
89 require_complete_type (value)
92 tree type = TREE_TYPE (value);
94 if (TREE_CODE (value) == ERROR_MARK)
95 return error_mark_node;
97 /* First, detect a valid value with a complete type. */
98 if (COMPLETE_TYPE_P (type))
101 incomplete_type_error (value, type);
102 return error_mark_node;
105 /* Print an error message for invalid use of an incomplete type.
106 VALUE is the expression that was used (or 0 if that isn't known)
107 and TYPE is the type that was invalid. */
110 incomplete_type_error (value, type)
114 const char *type_code_string;
116 /* Avoid duplicate error message. */
117 if (TREE_CODE (type) == ERROR_MARK)
120 if (value != 0 && (TREE_CODE (value) == VAR_DECL
121 || TREE_CODE (value) == PARM_DECL))
122 error ("`%s' has an incomplete type",
123 IDENTIFIER_POINTER (DECL_NAME (value)));
127 /* We must print an error message. Be clever about what it says. */
129 switch (TREE_CODE (type))
132 type_code_string = "struct";
136 type_code_string = "union";
140 type_code_string = "enum";
144 error ("invalid use of void expression");
148 if (TYPE_DOMAIN (type))
150 type = TREE_TYPE (type);
153 error ("invalid use of array with unspecified bounds");
160 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
161 error ("invalid use of undefined type `%s %s'",
162 type_code_string, IDENTIFIER_POINTER (TYPE_NAME (type)));
164 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
165 error ("invalid use of incomplete typedef `%s'",
166 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
170 /* Return a variant of TYPE which has all the type qualifiers of LIKE
171 as well as those of TYPE. */
174 qualify_type (type, like)
177 return c_build_qualified_type (type,
178 TYPE_QUALS (type) | TYPE_QUALS (like));
181 /* Return the common type of two types.
182 We assume that comptypes has already been done and returned 1;
183 if that isn't so, this may crash. In particular, we assume that qualifiers
186 This is the type for the result of most arithmetic operations
187 if the operands have the given two types. */
193 register enum tree_code code1;
194 register enum tree_code code2;
197 /* Save time if the two types are the same. */
199 if (t1 == t2) return t1;
201 /* If one type is nonsense, use the other. */
202 if (t1 == error_mark_node)
204 if (t2 == error_mark_node)
207 /* Merge the attributes. */
208 attributes = merge_machine_type_attributes (t1, t2);
210 /* Treat an enum type as the unsigned integer type of the same width. */
212 if (TREE_CODE (t1) == ENUMERAL_TYPE)
213 t1 = type_for_size (TYPE_PRECISION (t1), 1);
214 if (TREE_CODE (t2) == ENUMERAL_TYPE)
215 t2 = type_for_size (TYPE_PRECISION (t2), 1);
217 code1 = TREE_CODE (t1);
218 code2 = TREE_CODE (t2);
220 /* If one type is complex, form the common type of the non-complex
221 components, then make that complex. Use T1 or T2 if it is the
223 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
225 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
226 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
227 tree subtype = common_type (subtype1, subtype2);
229 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
230 return build_type_attribute_variant (t1, attributes);
231 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
232 return build_type_attribute_variant (t2, attributes);
234 return build_type_attribute_variant (build_complex_type (subtype),
242 /* If only one is real, use it as the result. */
244 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
245 return build_type_attribute_variant (t1, attributes);
247 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
248 return build_type_attribute_variant (t2, attributes);
250 /* Both real or both integers; use the one with greater precision. */
252 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
253 return build_type_attribute_variant (t1, attributes);
254 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
255 return build_type_attribute_variant (t2, attributes);
257 /* Same precision. Prefer longs to ints even when same size. */
259 if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
260 || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
261 return build_type_attribute_variant (long_unsigned_type_node,
264 if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
265 || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
267 /* But preserve unsignedness from the other type,
268 since long cannot hold all the values of an unsigned int. */
269 if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
270 t1 = long_unsigned_type_node;
272 t1 = long_integer_type_node;
273 return build_type_attribute_variant (t1, attributes);
276 /* Likewise, prefer long double to double even if same size. */
277 if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
278 || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
279 return build_type_attribute_variant (long_double_type_node,
282 /* Otherwise prefer the unsigned one. */
284 if (TREE_UNSIGNED (t1))
285 return build_type_attribute_variant (t1, attributes);
287 return build_type_attribute_variant (t2, attributes);
290 /* For two pointers, do this recursively on the target type,
291 and combine the qualifiers of the two types' targets. */
292 /* This code was turned off; I don't know why.
293 But ANSI C specifies doing this with the qualifiers.
294 So I turned it on again. */
296 tree pointed_to_1 = TREE_TYPE (t1);
297 tree pointed_to_2 = TREE_TYPE (t2);
298 tree target = common_type (TYPE_MAIN_VARIANT (pointed_to_1),
299 TYPE_MAIN_VARIANT (pointed_to_2));
300 t1 = build_pointer_type (c_build_qualified_type
302 TYPE_QUALS (pointed_to_1) |
303 TYPE_QUALS (pointed_to_2)));
304 return build_type_attribute_variant (t1, attributes);
307 t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2)));
308 return build_type_attribute_variant (t1, attributes);
313 tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
314 /* Save space: see if the result is identical to one of the args. */
315 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1))
316 return build_type_attribute_variant (t1, attributes);
317 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2))
318 return build_type_attribute_variant (t2, attributes);
319 /* Merge the element types, and have a size if either arg has one. */
320 t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2));
321 return build_type_attribute_variant (t1, attributes);
325 /* Function types: prefer the one that specified arg types.
326 If both do, merge the arg types. Also merge the return types. */
328 tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
329 tree p1 = TYPE_ARG_TYPES (t1);
330 tree p2 = TYPE_ARG_TYPES (t2);
335 /* Save space: see if the result is identical to one of the args. */
336 if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2))
337 return build_type_attribute_variant (t1, attributes);
338 if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1))
339 return build_type_attribute_variant (t2, attributes);
341 /* Simple way if one arg fails to specify argument types. */
342 if (TYPE_ARG_TYPES (t1) == 0)
344 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2));
345 return build_type_attribute_variant (t1, attributes);
347 if (TYPE_ARG_TYPES (t2) == 0)
349 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1));
350 return build_type_attribute_variant (t1, attributes);
353 /* If both args specify argument types, we must merge the two
354 lists, argument by argument. */
356 len = list_length (p1);
359 for (i = 0; i < len; i++)
360 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
365 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n))
367 /* A null type means arg type is not specified.
368 Take whatever the other function type has. */
369 if (TREE_VALUE (p1) == 0)
371 TREE_VALUE (n) = TREE_VALUE (p2);
374 if (TREE_VALUE (p2) == 0)
376 TREE_VALUE (n) = TREE_VALUE (p1);
380 /* Given wait (union {union wait *u; int *i} *)
381 and wait (union wait *),
382 prefer union wait * as type of parm. */
383 if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE
384 && TREE_VALUE (p1) != TREE_VALUE (p2))
387 for (memb = TYPE_FIELDS (TREE_VALUE (p1));
388 memb; memb = TREE_CHAIN (memb))
389 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2)))
391 TREE_VALUE (n) = TREE_VALUE (p2);
393 pedwarn ("function types not truly compatible in ISO C");
397 if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE
398 && TREE_VALUE (p2) != TREE_VALUE (p1))
401 for (memb = TYPE_FIELDS (TREE_VALUE (p2));
402 memb; memb = TREE_CHAIN (memb))
403 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1)))
405 TREE_VALUE (n) = TREE_VALUE (p1);
407 pedwarn ("function types not truly compatible in ISO C");
411 TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2));
415 t1 = build_function_type (valtype, newargs);
416 /* ... falls through ... */
420 return build_type_attribute_variant (t1, attributes);
425 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
426 or various other operations. Return 2 if they are compatible
427 but a warning may be needed if you use them together. */
430 comptypes (type1, type2)
433 register tree t1 = type1;
434 register tree t2 = type2;
437 /* Suppress errors caused by previously reported errors. */
439 if (t1 == t2 || !t1 || !t2
440 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK)
443 /* If either type is the internal version of sizetype, return the
445 if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1)
446 && TYPE_DOMAIN (t1) != 0)
447 t1 = TYPE_DOMAIN (t1);
449 if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2)
450 && TYPE_DOMAIN (t2) != 0)
451 t2 = TYPE_DOMAIN (t2);
453 /* Treat an enum type as the integer type of the same width and
456 if (TREE_CODE (t1) == ENUMERAL_TYPE)
457 t1 = type_for_size (TYPE_PRECISION (t1), TREE_UNSIGNED (t1));
458 if (TREE_CODE (t2) == ENUMERAL_TYPE)
459 t2 = type_for_size (TYPE_PRECISION (t2), TREE_UNSIGNED (t2));
464 /* Different classes of types can't be compatible. */
466 if (TREE_CODE (t1) != TREE_CODE (t2)) return 0;
468 /* Qualifiers must match. */
470 if (TYPE_QUALS (t1) != TYPE_QUALS (t2))
473 /* Allow for two different type nodes which have essentially the same
474 definition. Note that we already checked for equality of the type
475 qualifiers (just above). */
477 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
480 #ifndef COMP_TYPE_ATTRIBUTES
481 #define COMP_TYPE_ATTRIBUTES(t1,t2) 1
484 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
485 if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2)))
488 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
491 switch (TREE_CODE (t1))
494 val = (TREE_TYPE (t1) == TREE_TYPE (t2)
495 ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2)));
499 val = function_types_compatible_p (t1, t2);
504 tree d1 = TYPE_DOMAIN (t1);
505 tree d2 = TYPE_DOMAIN (t2);
508 /* Target types must match incl. qualifiers. */
509 if (TREE_TYPE (t1) != TREE_TYPE (t2)
510 && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2))))
513 /* Sizes must match unless one is missing or variable. */
514 if (d1 == 0 || d2 == 0 || d1 == d2
515 || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
516 || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
517 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST
518 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)
521 if (! tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2))
522 || ! tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2)))
529 if (maybe_objc_comptypes (t1, t2, 0) == 1)
536 return attrval == 2 && val == 1 ? 2 : val;
539 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
540 ignoring their qualifiers. */
543 comp_target_types (ttl, ttr)
548 /* Give maybe_objc_comptypes a crack at letting these types through. */
549 if ((val = maybe_objc_comptypes (ttl, ttr, 1)) >= 0)
552 val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
553 TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
555 if (val == 2 && pedantic)
556 pedwarn ("types are not quite compatible");
560 /* Subroutines of `comptypes'. */
562 /* Return 1 if two function types F1 and F2 are compatible.
563 If either type specifies no argument types,
564 the other must specify a fixed number of self-promoting arg types.
565 Otherwise, if one type specifies only the number of arguments,
566 the other must specify that number of self-promoting arg types.
567 Otherwise, the argument types must match. */
570 function_types_compatible_p (f1, f2)
574 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
578 if (!(TREE_TYPE (f1) == TREE_TYPE (f2)
579 || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2)))))
582 args1 = TYPE_ARG_TYPES (f1);
583 args2 = TYPE_ARG_TYPES (f2);
585 /* An unspecified parmlist matches any specified parmlist
586 whose argument types don't need default promotions. */
590 if (!self_promoting_args_p (args2))
592 /* If one of these types comes from a non-prototype fn definition,
593 compare that with the other type's arglist.
594 If they don't match, ask for a warning (but no error). */
595 if (TYPE_ACTUAL_ARG_TYPES (f1)
596 && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1)))
602 if (!self_promoting_args_p (args1))
604 if (TYPE_ACTUAL_ARG_TYPES (f2)
605 && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2)))
610 /* Both types have argument lists: compare them and propagate results. */
611 val1 = type_lists_compatible_p (args1, args2);
612 return val1 != 1 ? val1 : val;
615 /* Check two lists of types for compatibility,
616 returning 0 for incompatible, 1 for compatible,
617 or 2 for compatible with warning. */
620 type_lists_compatible_p (args1, args2)
623 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
629 if (args1 == 0 && args2 == 0)
631 /* If one list is shorter than the other,
632 they fail to match. */
633 if (args1 == 0 || args2 == 0)
635 /* A null pointer instead of a type
636 means there is supposed to be an argument
637 but nothing is specified about what type it has.
638 So match anything that self-promotes. */
639 if (TREE_VALUE (args1) == 0)
641 if (simple_type_promotes_to (TREE_VALUE (args2)) != NULL_TREE)
644 else if (TREE_VALUE (args2) == 0)
646 if (simple_type_promotes_to (TREE_VALUE (args1)) != NULL_TREE)
649 else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2))))
651 /* Allow wait (union {union wait *u; int *i} *)
652 and wait (union wait *) to be compatible. */
653 if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE
654 && (TYPE_NAME (TREE_VALUE (args1)) == 0
655 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args1)))
656 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST
657 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)),
658 TYPE_SIZE (TREE_VALUE (args2))))
661 for (memb = TYPE_FIELDS (TREE_VALUE (args1));
662 memb; memb = TREE_CHAIN (memb))
663 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2)))
668 else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE
669 && (TYPE_NAME (TREE_VALUE (args2)) == 0
670 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args2)))
671 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST
672 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)),
673 TYPE_SIZE (TREE_VALUE (args1))))
676 for (memb = TYPE_FIELDS (TREE_VALUE (args2));
677 memb; memb = TREE_CHAIN (memb))
678 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1)))
687 /* comptypes said ok, but record if it said to warn. */
691 args1 = TREE_CHAIN (args1);
692 args2 = TREE_CHAIN (args2);
696 /* Compute the value of the `sizeof' operator. */
702 enum tree_code code = TREE_CODE (type);
705 if (code == FUNCTION_TYPE)
707 if (pedantic || warn_pointer_arith)
708 pedwarn ("sizeof applied to a function type");
709 size = size_one_node;
711 else if (code == VOID_TYPE)
713 if (pedantic || warn_pointer_arith)
714 pedwarn ("sizeof applied to a void type");
715 size = size_one_node;
717 else if (code == ERROR_MARK)
718 size = size_one_node;
719 else if (!COMPLETE_TYPE_P (type))
721 error ("sizeof applied to an incomplete type");
722 size = size_zero_node;
725 /* Convert in case a char is more than one unit. */
726 size = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
727 size_int (TYPE_PRECISION (char_type_node)
730 /* SIZE will have an integer type with TYPE_IS_SIZETYPE set.
731 TYPE_IS_SIZETYPE means that certain things (like overflow) will
732 never happen. However, this node should really have type
733 `size_t', which is just a typedef for an ordinary integer type. */
734 return fold (build1 (NOP_EXPR, c_size_type_node, size));
738 c_sizeof_nowarn (type)
741 enum tree_code code = TREE_CODE (type);
744 if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK)
745 size = size_one_node;
746 else if (!COMPLETE_TYPE_P (type))
747 size = size_zero_node;
749 /* Convert in case a char is more than one unit. */
750 size = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
751 size_int (TYPE_PRECISION (char_type_node)
754 /* SIZE will have an integer type with TYPE_IS_SIZETYPE set.
755 TYPE_IS_SIZETYPE means that certain things (like overflow) will
756 never happen. However, this node should really have type
757 `size_t', which is just a typedef for an ordinary integer type. */
758 return fold (build1 (NOP_EXPR, c_size_type_node, size));
761 /* Compute the size to increment a pointer by. */
764 c_size_in_bytes (type)
767 enum tree_code code = TREE_CODE (type);
769 if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK)
770 return size_one_node;
772 if (!COMPLETE_OR_VOID_TYPE_P (type))
774 error ("arithmetic on pointer to an incomplete type");
775 return size_one_node;
778 /* Convert in case a char is more than one unit. */
779 return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
780 size_int (TYPE_PRECISION (char_type_node)
784 /* Implement the __alignof keyword: Return the minimum required
785 alignment of TYPE, measured in bytes. */
791 enum tree_code code = TREE_CODE (type);
794 if (code == FUNCTION_TYPE)
795 t = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
796 else if (code == VOID_TYPE || code == ERROR_MARK)
798 else if (code == ERROR_MARK)
800 else if (!COMPLETE_TYPE_P (type))
802 error ("__alignof__ applied to an incomplete type");
806 t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
808 return fold (build1 (NOP_EXPR, c_size_type_node, t));
811 /* Implement the __alignof keyword: Return the minimum required
812 alignment of EXPR, measured in bytes. For VAR_DECL's and
813 FIELD_DECL's return DECL_ALIGN (which can be set from an
814 "aligned" __attribute__ specification). */
817 c_alignof_expr (expr)
822 if (TREE_CODE (expr) == VAR_DECL)
823 t = size_int (DECL_ALIGN (expr) / BITS_PER_UNIT);
825 else if (TREE_CODE (expr) == COMPONENT_REF
826 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
828 error ("`__alignof' applied to a bit-field");
831 else if (TREE_CODE (expr) == COMPONENT_REF
832 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
833 t = size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT);
835 else if (TREE_CODE (expr) == INDIRECT_REF)
837 tree t = TREE_OPERAND (expr, 0);
839 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
841 while (TREE_CODE (t) == NOP_EXPR
842 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
846 t = TREE_OPERAND (t, 0);
847 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
848 if (thisalign > bestalign)
849 best = t, bestalign = thisalign;
851 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
854 return c_alignof (TREE_TYPE (expr));
856 return fold (build1 (NOP_EXPR, c_size_type_node, t));
859 /* Return either DECL or its known constant value (if it has one). */
862 decl_constant_value (decl)
865 if (/* Don't change a variable array bound or initial value to a constant
866 in a place where a variable is invalid. */
867 current_function_decl != 0
868 && ! TREE_THIS_VOLATILE (decl)
869 && TREE_READONLY (decl)
870 && DECL_INITIAL (decl) != 0
871 && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK
872 /* This is invalid if initial value is not constant.
873 If it has either a function call, a memory reference,
874 or a variable, then re-evaluating it could give different results. */
875 && TREE_CONSTANT (DECL_INITIAL (decl))
876 /* Check for cases where this is sub-optimal, even though valid. */
877 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR)
878 return DECL_INITIAL (decl);
882 /* Return either DECL or its known constant value (if it has one), but
883 return DECL if pedantic or DECL has mode BLKmode. This is for
884 bug-compatibility with the old behavior of decl_constant_value
885 (before GCC 3.0); every use of this function is a bug and it should
886 be removed before GCC 3.1. It is not appropriate to use pedantic
887 in a way that affects optimization, and BLKmode is probably not the
888 right test for avoiding misoptimizations either. */
891 decl_constant_value_for_broken_optimization (decl)
894 if (pedantic || DECL_MODE (decl) == BLKmode)
897 return decl_constant_value (decl);
900 /* Perform default promotions for C data used in expressions.
901 Arrays and functions are converted to pointers;
902 enumeral types or short or char, to int.
903 In addition, manifest constants symbols are replaced by their values. */
906 default_conversion (exp)
909 register tree type = TREE_TYPE (exp);
910 register enum tree_code code = TREE_CODE (type);
912 /* Constants can be used directly unless they're not loadable. */
913 if (TREE_CODE (exp) == CONST_DECL)
914 exp = DECL_INITIAL (exp);
916 /* Replace a nonvolatile const static variable with its value unless
917 it is an array, in which case we must be sure that taking the
918 address of the array produces consistent results. */
919 else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE)
921 exp = decl_constant_value_for_broken_optimization (exp);
922 type = TREE_TYPE (exp);
925 /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as
928 Do not use STRIP_NOPS here! It will remove conversions from pointer
929 to integer and cause infinite recursion. */
930 while (TREE_CODE (exp) == NON_LVALUE_EXPR
931 || (TREE_CODE (exp) == NOP_EXPR
932 && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp)))
933 exp = TREE_OPERAND (exp, 0);
935 /* Normally convert enums to int,
936 but convert wide enums to something wider. */
937 if (code == ENUMERAL_TYPE)
939 type = type_for_size (MAX (TYPE_PRECISION (type),
940 TYPE_PRECISION (integer_type_node)),
942 || (TYPE_PRECISION (type)
943 >= TYPE_PRECISION (integer_type_node)))
944 && TREE_UNSIGNED (type)));
946 return convert (type, exp);
949 if (TREE_CODE (exp) == COMPONENT_REF
950 && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1))
951 /* If it's thinner than an int, promote it like a
952 C_PROMOTING_INTEGER_TYPE_P, otherwise leave it alone. */
953 && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)),
954 TYPE_PRECISION (integer_type_node)))
955 return convert (flag_traditional && TREE_UNSIGNED (type)
956 ? unsigned_type_node : integer_type_node,
959 if (C_PROMOTING_INTEGER_TYPE_P (type))
961 /* Traditionally, unsignedness is preserved in default promotions.
962 Also preserve unsignedness if not really getting any wider. */
963 if (TREE_UNSIGNED (type)
965 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
966 return convert (unsigned_type_node, exp);
968 return convert (integer_type_node, exp);
971 if (code == BOOLEAN_TYPE)
972 return convert (integer_type_node, exp);
974 if (flag_traditional && !flag_allow_single_precision
975 && TYPE_MAIN_VARIANT (type) == float_type_node)
976 return convert (double_type_node, exp);
978 if (code == VOID_TYPE)
980 error ("void value not ignored as it ought to be");
981 return error_mark_node;
983 if (code == FUNCTION_TYPE)
985 return build_unary_op (ADDR_EXPR, exp, 0);
987 if (code == ARRAY_TYPE)
990 tree restype = TREE_TYPE (type);
995 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' || DECL_P (exp))
997 constp = TREE_READONLY (exp);
998 volatilep = TREE_THIS_VOLATILE (exp);
1001 if (TYPE_QUALS (type) || constp || volatilep)
1003 = c_build_qualified_type (restype,
1005 | (constp * TYPE_QUAL_CONST)
1006 | (volatilep * TYPE_QUAL_VOLATILE));
1008 if (TREE_CODE (exp) == INDIRECT_REF)
1009 return convert (TYPE_POINTER_TO (restype),
1010 TREE_OPERAND (exp, 0));
1012 if (TREE_CODE (exp) == COMPOUND_EXPR)
1014 tree op1 = default_conversion (TREE_OPERAND (exp, 1));
1015 return build (COMPOUND_EXPR, TREE_TYPE (op1),
1016 TREE_OPERAND (exp, 0), op1);
1019 if (! lvalue_p (exp)
1020 && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp)))
1022 error ("invalid use of non-lvalue array");
1023 return error_mark_node;
1026 ptrtype = build_pointer_type (restype);
1028 if (TREE_CODE (exp) == VAR_DECL)
1030 /* ??? This is not really quite correct
1031 in that the type of the operand of ADDR_EXPR
1032 is not the target type of the type of the ADDR_EXPR itself.
1033 Question is, can this lossage be avoided? */
1034 adr = build1 (ADDR_EXPR, ptrtype, exp);
1035 if (mark_addressable (exp) == 0)
1036 return error_mark_node;
1037 TREE_CONSTANT (adr) = staticp (exp);
1038 TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
1041 /* This way is better for a COMPONENT_REF since it can
1042 simplify the offset for a component. */
1043 adr = build_unary_op (ADDR_EXPR, exp, 1);
1044 return convert (ptrtype, adr);
1049 /* Look up component name in the structure type definition.
1051 If this component name is found indirectly within an anonymous union,
1052 store in *INDIRECT the component which directly contains
1053 that anonymous union. Otherwise, set *INDIRECT to 0. */
1056 lookup_field (type, component, indirect)
1057 tree type, component;
1062 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1063 to the field elements. Use a binary search on this array to quickly
1064 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1065 will always be set for structures which have many elements. */
1067 if (TYPE_LANG_SPECIFIC (type))
1070 tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0];
1072 field = TYPE_FIELDS (type);
1074 top = TYPE_LANG_SPECIFIC (type)->len;
1075 while (top - bot > 1)
1077 half = (top - bot + 1) >> 1;
1078 field = field_array[bot+half];
1080 if (DECL_NAME (field) == NULL_TREE)
1082 /* Step through all anon unions in linear fashion. */
1083 while (DECL_NAME (field_array[bot]) == NULL_TREE)
1085 tree anon = 0, junk;
1087 field = field_array[bot++];
1088 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1089 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1090 anon = lookup_field (TREE_TYPE (field), component, &junk);
1092 if (anon != NULL_TREE)
1099 /* Entire record is only anon unions. */
1103 /* Restart the binary search, with new lower bound. */
1107 if (DECL_NAME (field) == component)
1109 if (DECL_NAME (field) < component)
1115 if (DECL_NAME (field_array[bot]) == component)
1116 field = field_array[bot];
1117 else if (DECL_NAME (field) != component)
1122 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1124 if (DECL_NAME (field) == NULL_TREE)
1129 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1130 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1131 anon = lookup_field (TREE_TYPE (field), component, &junk);
1133 if (anon != NULL_TREE)
1140 if (DECL_NAME (field) == component)
1145 *indirect = NULL_TREE;
1149 /* Make an expression to refer to the COMPONENT field of
1150 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1153 build_component_ref (datum, component)
1154 tree datum, component;
1156 register tree type = TREE_TYPE (datum);
1157 register enum tree_code code = TREE_CODE (type);
1158 register tree field = NULL;
1161 /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it
1162 unless we are not to support things not strictly ANSI. */
1163 switch (TREE_CODE (datum))
1167 tree value = build_component_ref (TREE_OPERAND (datum, 1), component);
1168 return build (COMPOUND_EXPR, TREE_TYPE (value),
1169 TREE_OPERAND (datum, 0), value);
1172 return build_conditional_expr
1173 (TREE_OPERAND (datum, 0),
1174 build_component_ref (TREE_OPERAND (datum, 1), component),
1175 build_component_ref (TREE_OPERAND (datum, 2), component));
1181 /* See if there is a field or component with name COMPONENT. */
1183 if (code == RECORD_TYPE || code == UNION_TYPE)
1187 if (!COMPLETE_TYPE_P (type))
1189 incomplete_type_error (NULL_TREE, type);
1190 return error_mark_node;
1193 field = lookup_field (type, component, &indirect);
1197 error ("%s has no member named `%s'",
1198 code == RECORD_TYPE ? "structure" : "union",
1199 IDENTIFIER_POINTER (component));
1200 return error_mark_node;
1202 if (TREE_TYPE (field) == error_mark_node)
1203 return error_mark_node;
1205 /* If FIELD was found buried within an anonymous union,
1206 make one COMPONENT_REF to get that anonymous union,
1207 then fall thru to make a second COMPONENT_REF to get FIELD. */
1210 ref = build (COMPONENT_REF, TREE_TYPE (indirect), datum, indirect);
1211 if (TREE_READONLY (datum) || TREE_READONLY (indirect))
1212 TREE_READONLY (ref) = 1;
1213 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (indirect))
1214 TREE_THIS_VOLATILE (ref) = 1;
1218 ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field);
1220 if (TREE_READONLY (datum) || TREE_READONLY (field))
1221 TREE_READONLY (ref) = 1;
1222 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field))
1223 TREE_THIS_VOLATILE (ref) = 1;
1227 else if (code != ERROR_MARK)
1228 error ("request for member `%s' in something not a structure or union",
1229 IDENTIFIER_POINTER (component));
1231 return error_mark_node;
1234 /* Given an expression PTR for a pointer, return an expression
1235 for the value pointed to.
1236 ERRORSTRING is the name of the operator to appear in error messages. */
1239 build_indirect_ref (ptr, errorstring)
1241 const char *errorstring;
1243 register tree pointer = default_conversion (ptr);
1244 register tree type = TREE_TYPE (pointer);
1246 if (TREE_CODE (type) == POINTER_TYPE)
1248 if (TREE_CODE (pointer) == ADDR_EXPR
1250 && (TREE_TYPE (TREE_OPERAND (pointer, 0))
1251 == TREE_TYPE (type)))
1252 return TREE_OPERAND (pointer, 0);
1255 tree t = TREE_TYPE (type);
1256 register tree ref = build1 (INDIRECT_REF,
1257 TYPE_MAIN_VARIANT (t), pointer);
1259 if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE)
1261 error ("dereferencing pointer to incomplete type");
1262 return error_mark_node;
1264 if (VOID_TYPE_P (t) && skip_evaluation == 0)
1265 warning ("dereferencing `void *' pointer");
1267 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
1268 so that we get the proper error message if the result is used
1269 to assign to. Also, &* is supposed to be a no-op.
1270 And ANSI C seems to specify that the type of the result
1271 should be the const type. */
1272 /* A de-reference of a pointer to const is not a const. It is valid
1273 to change it via some other pointer. */
1274 TREE_READONLY (ref) = TYPE_READONLY (t);
1275 TREE_SIDE_EFFECTS (ref)
1276 = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile;
1277 TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
1281 else if (TREE_CODE (pointer) != ERROR_MARK)
1282 error ("invalid type argument of `%s'", errorstring);
1283 return error_mark_node;
1286 /* This handles expressions of the form "a[i]", which denotes
1289 This is logically equivalent in C to *(a+i), but we may do it differently.
1290 If A is a variable or a member, we generate a primitive ARRAY_REF.
1291 This avoids forcing the array out of registers, and can work on
1292 arrays that are not lvalues (for example, members of structures returned
1296 build_array_ref (array, index)
1301 error ("subscript missing in array reference");
1302 return error_mark_node;
1305 if (TREE_TYPE (array) == error_mark_node
1306 || TREE_TYPE (index) == error_mark_node)
1307 return error_mark_node;
1309 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE
1310 && TREE_CODE (array) != INDIRECT_REF)
1314 /* Subscripting with type char is likely to lose
1315 on a machine where chars are signed.
1316 So warn on any machine, but optionally.
1317 Don't warn for unsigned char since that type is safe.
1318 Don't warn for signed char because anyone who uses that
1319 must have done so deliberately. */
1320 if (warn_char_subscripts
1321 && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node)
1322 warning ("array subscript has type `char'");
1324 /* Apply default promotions *after* noticing character types. */
1325 index = default_conversion (index);
1327 /* Require integer *after* promotion, for sake of enums. */
1328 if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE)
1330 error ("array subscript is not an integer");
1331 return error_mark_node;
1334 /* An array that is indexed by a non-constant
1335 cannot be stored in a register; we must be able to do
1336 address arithmetic on its address.
1337 Likewise an array of elements of variable size. */
1338 if (TREE_CODE (index) != INTEGER_CST
1339 || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array)))
1340 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST))
1342 if (mark_addressable (array) == 0)
1343 return error_mark_node;
1345 /* An array that is indexed by a constant value which is not within
1346 the array bounds cannot be stored in a register either; because we
1347 would get a crash in store_bit_field/extract_bit_field when trying
1348 to access a non-existent part of the register. */
1349 if (TREE_CODE (index) == INTEGER_CST
1350 && TYPE_VALUES (TREE_TYPE (array))
1351 && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array))))
1353 if (mark_addressable (array) == 0)
1354 return error_mark_node;
1360 while (TREE_CODE (foo) == COMPONENT_REF)
1361 foo = TREE_OPERAND (foo, 0);
1362 if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo))
1363 pedwarn ("ISO C forbids subscripting `register' array");
1364 else if (! flag_isoc99 && ! lvalue_p (foo))
1365 pedwarn ("ISO C89 forbids subscripting non-lvalue array");
1368 type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array)));
1369 rval = build (ARRAY_REF, type, array, index);
1370 /* Array ref is const/volatile if the array elements are
1371 or if the array is. */
1372 TREE_READONLY (rval)
1373 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array)))
1374 | TREE_READONLY (array));
1375 TREE_SIDE_EFFECTS (rval)
1376 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1377 | TREE_SIDE_EFFECTS (array));
1378 TREE_THIS_VOLATILE (rval)
1379 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1380 /* This was added by rms on 16 Nov 91.
1381 It fixes vol struct foo *a; a->elts[1]
1382 in an inline function.
1383 Hope it doesn't break something else. */
1384 | TREE_THIS_VOLATILE (array));
1385 return require_complete_type (fold (rval));
1389 tree ar = default_conversion (array);
1390 tree ind = default_conversion (index);
1392 /* Do the same warning check as above, but only on the part that's
1393 syntactically the index and only if it is also semantically
1395 if (warn_char_subscripts
1396 && TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE
1397 && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node)
1398 warning ("subscript has type `char'");
1400 /* Put the integer in IND to simplify error checking. */
1401 if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE)
1408 if (ar == error_mark_node)
1411 if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE
1412 || TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) == FUNCTION_TYPE)
1414 error ("subscripted value is neither array nor pointer");
1415 return error_mark_node;
1417 if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE)
1419 error ("array subscript is not an integer");
1420 return error_mark_node;
1423 return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0),
1428 /* Build an external reference to identifier ID. FUN indicates
1429 whether this will be used for a function call. */
1431 build_external_ref (id, fun)
1436 tree decl = lookup_name (id);
1437 tree objc_ivar = lookup_objc_ivar (id);
1439 if (!decl || decl == error_mark_node || C_DECL_ANTICIPATED (decl))
1445 if (!decl || decl == error_mark_node)
1446 /* Ordinary implicit function declaration. */
1447 ref = implicitly_declare (id);
1450 /* Implicit declaration of built-in function. Don't
1451 change the built-in declaration, but don't let this
1452 go by silently, either. */
1453 implicit_decl_warning (id);
1455 /* only issue this warning once */
1456 C_DECL_ANTICIPATED (decl) = 0;
1462 /* Reference to undeclared variable, including reference to
1463 builtin outside of function-call context. */
1464 if (current_function_decl == 0)
1465 error ("`%s' undeclared here (not in a function)",
1466 IDENTIFIER_POINTER (id));
1469 if (IDENTIFIER_GLOBAL_VALUE (id) != error_mark_node
1470 || IDENTIFIER_ERROR_LOCUS (id) != current_function_decl)
1472 error ("`%s' undeclared (first use in this function)",
1473 IDENTIFIER_POINTER (id));
1475 if (! undeclared_variable_notice)
1477 error ("(Each undeclared identifier is reported only once");
1478 error ("for each function it appears in.)");
1479 undeclared_variable_notice = 1;
1482 IDENTIFIER_GLOBAL_VALUE (id) = error_mark_node;
1483 IDENTIFIER_ERROR_LOCUS (id) = current_function_decl;
1485 return error_mark_node;
1490 /* Properly declared variable or function reference. */
1493 else if (decl != objc_ivar && IDENTIFIER_LOCAL_VALUE (id))
1495 warning ("local declaration of `%s' hides instance variable",
1496 IDENTIFIER_POINTER (id));
1503 if (TREE_TYPE (ref) == error_mark_node)
1504 return error_mark_node;
1506 assemble_external (ref);
1507 TREE_USED (ref) = 1;
1509 if (TREE_CODE (ref) == CONST_DECL)
1511 ref = DECL_INITIAL (ref);
1512 TREE_CONSTANT (ref) = 1;
1518 /* Build a function call to function FUNCTION with parameters PARAMS.
1519 PARAMS is a list--a chain of TREE_LIST nodes--in which the
1520 TREE_VALUE of each node is a parameter-expression.
1521 FUNCTION's data type may be a function type or a pointer-to-function. */
1524 build_function_call (function, params)
1525 tree function, params;
1527 register tree fntype, fundecl = 0;
1528 register tree coerced_params;
1529 tree name = NULL_TREE, assembler_name = NULL_TREE, result;
1531 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1532 STRIP_TYPE_NOPS (function);
1534 /* Convert anything with function type to a pointer-to-function. */
1535 if (TREE_CODE (function) == FUNCTION_DECL)
1537 name = DECL_NAME (function);
1538 assembler_name = DECL_ASSEMBLER_NAME (function);
1540 /* Differs from default_conversion by not setting TREE_ADDRESSABLE
1541 (because calling an inline function does not mean the function
1542 needs to be separately compiled). */
1543 fntype = build_type_variant (TREE_TYPE (function),
1544 TREE_READONLY (function),
1545 TREE_THIS_VOLATILE (function));
1547 function = build1 (ADDR_EXPR, build_pointer_type (fntype), function);
1550 function = default_conversion (function);
1552 fntype = TREE_TYPE (function);
1554 if (TREE_CODE (fntype) == ERROR_MARK)
1555 return error_mark_node;
1557 if (!(TREE_CODE (fntype) == POINTER_TYPE
1558 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE))
1560 error ("called object is not a function");
1561 return error_mark_node;
1564 /* fntype now gets the type of function pointed to. */
1565 fntype = TREE_TYPE (fntype);
1567 /* Convert the parameters to the types declared in the
1568 function prototype, or apply default promotions. */
1571 = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl);
1573 /* Check for errors in format strings. */
1575 if (warn_format && (name || assembler_name))
1576 check_function_format (NULL, name, assembler_name, coerced_params);
1578 /* Recognize certain built-in functions so we can make tree-codes
1579 other than CALL_EXPR. We do this when it enables fold-const.c
1580 to do something useful. */
1582 if (TREE_CODE (function) == ADDR_EXPR
1583 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
1584 && DECL_BUILT_IN (TREE_OPERAND (function, 0)))
1586 result = expand_tree_builtin (TREE_OPERAND (function, 0),
1587 params, coerced_params);
1592 result = build (CALL_EXPR, TREE_TYPE (fntype),
1593 function, coerced_params, NULL_TREE);
1594 TREE_SIDE_EFFECTS (result) = 1;
1595 result = fold (result);
1597 if (VOID_TYPE_P (TREE_TYPE (result)))
1599 return require_complete_type (result);
1602 /* Convert the argument expressions in the list VALUES
1603 to the types in the list TYPELIST. The result is a list of converted
1604 argument expressions.
1606 If TYPELIST is exhausted, or when an element has NULL as its type,
1607 perform the default conversions.
1609 PARMLIST is the chain of parm decls for the function being called.
1610 It may be 0, if that info is not available.
1611 It is used only for generating error messages.
1613 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
1615 This is also where warnings about wrong number of args are generated.
1617 Both VALUES and the returned value are chains of TREE_LIST nodes
1618 with the elements of the list in the TREE_VALUE slots of those nodes. */
1621 convert_arguments (typelist, values, name, fundecl)
1622 tree typelist, values, name, fundecl;
1624 register tree typetail, valtail;
1625 register tree result = NULL;
1628 /* Scan the given expressions and types, producing individual
1629 converted arguments and pushing them on RESULT in reverse order. */
1631 for (valtail = values, typetail = typelist, parmnum = 0;
1633 valtail = TREE_CHAIN (valtail), parmnum++)
1635 register tree type = typetail ? TREE_VALUE (typetail) : 0;
1636 register tree val = TREE_VALUE (valtail);
1638 if (type == void_type_node)
1641 error ("too many arguments to function `%s'",
1642 IDENTIFIER_POINTER (name));
1644 error ("too many arguments to function");
1648 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1649 /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0
1650 to convert automatically to a pointer. */
1651 if (TREE_CODE (val) == NON_LVALUE_EXPR)
1652 val = TREE_OPERAND (val, 0);
1654 if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE
1655 || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE)
1656 val = default_conversion (val);
1658 val = require_complete_type (val);
1662 /* Formal parm type is specified by a function prototype. */
1665 if (!COMPLETE_TYPE_P (type))
1667 error ("type of formal parameter %d is incomplete", parmnum + 1);
1672 /* Optionally warn about conversions that
1673 differ from the default conversions. */
1674 if (warn_conversion)
1676 int formal_prec = TYPE_PRECISION (type);
1678 if (INTEGRAL_TYPE_P (type)
1679 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1680 warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1681 else if (TREE_CODE (type) == COMPLEX_TYPE
1682 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1683 warn_for_assignment ("%s as complex rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1684 else if (TREE_CODE (type) == REAL_TYPE
1685 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1686 warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1);
1687 else if (TREE_CODE (type) == REAL_TYPE
1688 && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE)
1689 warn_for_assignment ("%s as floating rather than complex due to prototype", (char *) 0, name, parmnum + 1);
1690 /* ??? At some point, messages should be written about
1691 conversions between complex types, but that's too messy
1693 else if (TREE_CODE (type) == REAL_TYPE
1694 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1696 /* Warn if any argument is passed as `float',
1697 since without a prototype it would be `double'. */
1698 if (formal_prec == TYPE_PRECISION (float_type_node))
1699 warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1);
1701 /* Detect integer changing in width or signedness. */
1702 else if (INTEGRAL_TYPE_P (type)
1703 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1705 tree would_have_been = default_conversion (val);
1706 tree type1 = TREE_TYPE (would_have_been);
1708 if (TREE_CODE (type) == ENUMERAL_TYPE
1709 && type == TREE_TYPE (val))
1710 /* No warning if function asks for enum
1711 and the actual arg is that enum type. */
1713 else if (formal_prec != TYPE_PRECISION (type1))
1714 warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1);
1715 else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1))
1717 /* Don't complain if the formal parameter type
1718 is an enum, because we can't tell now whether
1719 the value was an enum--even the same enum. */
1720 else if (TREE_CODE (type) == ENUMERAL_TYPE)
1722 else if (TREE_CODE (val) == INTEGER_CST
1723 && int_fits_type_p (val, type))
1724 /* Change in signedness doesn't matter
1725 if a constant value is unaffected. */
1727 /* Likewise for a constant in a NOP_EXPR. */
1728 else if (TREE_CODE (val) == NOP_EXPR
1729 && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST
1730 && int_fits_type_p (TREE_OPERAND (val, 0), type))
1732 #if 0 /* We never get such tree structure here. */
1733 else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE
1734 && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type)
1735 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type))
1736 /* Change in signedness doesn't matter
1737 if an enum value is unaffected. */
1740 /* If the value is extended from a narrower
1741 unsigned type, it doesn't matter whether we
1742 pass it as signed or unsigned; the value
1743 certainly is the same either way. */
1744 else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
1745 && TREE_UNSIGNED (TREE_TYPE (val)))
1747 else if (TREE_UNSIGNED (type))
1748 warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
1750 warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
1754 parmval = convert_for_assignment (type, val,
1755 (char *) 0, /* arg passing */
1756 fundecl, name, parmnum + 1);
1758 if (PROMOTE_PROTOTYPES
1759 && (TREE_CODE (type) == INTEGER_TYPE
1760 || TREE_CODE (type) == ENUMERAL_TYPE
1761 || TREE_CODE (type) == BOOLEAN_TYPE)
1762 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
1763 parmval = default_conversion (parmval);
1765 result = tree_cons (NULL_TREE, parmval, result);
1767 else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE
1768 && (TYPE_PRECISION (TREE_TYPE (val))
1769 < TYPE_PRECISION (double_type_node)))
1770 /* Convert `float' to `double'. */
1771 result = tree_cons (NULL_TREE, convert (double_type_node, val), result);
1773 /* Convert `short' and `char' to full-size `int'. */
1774 result = tree_cons (NULL_TREE, default_conversion (val), result);
1777 typetail = TREE_CHAIN (typetail);
1780 if (typetail != 0 && TREE_VALUE (typetail) != void_type_node)
1783 error ("too few arguments to function `%s'",
1784 IDENTIFIER_POINTER (name));
1786 error ("too few arguments to function");
1789 return nreverse (result);
1792 /* This is the entry point used by the parser
1793 for binary operators in the input.
1794 In addition to constructing the expression,
1795 we check for operands that were written with other binary operators
1796 in a way that is likely to confuse the user. */
1799 parser_build_binary_op (code, arg1, arg2)
1800 enum tree_code code;
1803 tree result = build_binary_op (code, arg1, arg2, 1);
1806 char class1 = TREE_CODE_CLASS (TREE_CODE (arg1));
1807 char class2 = TREE_CODE_CLASS (TREE_CODE (arg2));
1808 enum tree_code code1 = ERROR_MARK;
1809 enum tree_code code2 = ERROR_MARK;
1811 if (class1 == 'e' || class1 == '1'
1812 || class1 == '2' || class1 == '<')
1813 code1 = C_EXP_ORIGINAL_CODE (arg1);
1814 if (class2 == 'e' || class2 == '1'
1815 || class2 == '2' || class2 == '<')
1816 code2 = C_EXP_ORIGINAL_CODE (arg2);
1818 /* Check for cases such as x+y<<z which users are likely
1819 to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE
1820 is cleared to prevent these warnings. */
1821 if (warn_parentheses)
1823 if (code == LSHIFT_EXPR || code == RSHIFT_EXPR)
1825 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1826 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1827 warning ("suggest parentheses around + or - inside shift");
1830 if (code == TRUTH_ORIF_EXPR)
1832 if (code1 == TRUTH_ANDIF_EXPR
1833 || code2 == TRUTH_ANDIF_EXPR)
1834 warning ("suggest parentheses around && within ||");
1837 if (code == BIT_IOR_EXPR)
1839 if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR
1840 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1841 || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR
1842 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1843 warning ("suggest parentheses around arithmetic in operand of |");
1844 /* Check cases like x|y==z */
1845 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1846 warning ("suggest parentheses around comparison in operand of |");
1849 if (code == BIT_XOR_EXPR)
1851 if (code1 == BIT_AND_EXPR
1852 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1853 || code2 == BIT_AND_EXPR
1854 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1855 warning ("suggest parentheses around arithmetic in operand of ^");
1856 /* Check cases like x^y==z */
1857 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1858 warning ("suggest parentheses around comparison in operand of ^");
1861 if (code == BIT_AND_EXPR)
1863 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1864 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1865 warning ("suggest parentheses around + or - in operand of &");
1866 /* Check cases like x&y==z */
1867 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1868 warning ("suggest parentheses around comparison in operand of &");
1872 /* Similarly, check for cases like 1<=i<=10 that are probably errors. */
1873 if (TREE_CODE_CLASS (code) == '<' && extra_warnings
1874 && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<'))
1875 warning ("comparisons like X<=Y<=Z do not have their mathematical meaning");
1877 unsigned_conversion_warning (result, arg1);
1878 unsigned_conversion_warning (result, arg2);
1879 overflow_warning (result);
1881 class = TREE_CODE_CLASS (TREE_CODE (result));
1883 /* Record the code that was specified in the source,
1884 for the sake of warnings about confusing nesting. */
1885 if (class == 'e' || class == '1'
1886 || class == '2' || class == '<')
1887 C_SET_EXP_ORIGINAL_CODE (result, code);
1890 int flag = TREE_CONSTANT (result);
1891 /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR
1892 so that convert_for_assignment wouldn't strip it.
1893 That way, we got warnings for things like p = (1 - 1).
1894 But it turns out we should not get those warnings. */
1895 result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result);
1896 C_SET_EXP_ORIGINAL_CODE (result, code);
1897 TREE_CONSTANT (result) = flag;
1903 /* Build a binary-operation expression without default conversions.
1904 CODE is the kind of expression to build.
1905 This function differs from `build' in several ways:
1906 the data type of the result is computed and recorded in it,
1907 warnings are generated if arg data types are invalid,
1908 special handling for addition and subtraction of pointers is known,
1909 and some optimization is done (operations on narrow ints
1910 are done in the narrower type when that gives the same result).
1911 Constant folding is also done before the result is returned.
1913 Note that the operands will never have enumeral types, or function
1914 or array types, because either they will have the default conversions
1915 performed or they have both just been converted to some other type in which
1916 the arithmetic is to be done. */
1919 build_binary_op (code, orig_op0, orig_op1, convert_p)
1920 enum tree_code code;
1921 tree orig_op0, orig_op1;
1925 register enum tree_code code0, code1;
1928 /* Expression code to give to the expression when it is built.
1929 Normally this is CODE, which is what the caller asked for,
1930 but in some special cases we change it. */
1931 register enum tree_code resultcode = code;
1933 /* Data type in which the computation is to be performed.
1934 In the simplest cases this is the common type of the arguments. */
1935 register tree result_type = NULL;
1937 /* Nonzero means operands have already been type-converted
1938 in whatever way is necessary.
1939 Zero means they need to be converted to RESULT_TYPE. */
1942 /* Nonzero means create the expression with this type, rather than
1944 tree build_type = 0;
1946 /* Nonzero means after finally constructing the expression
1947 convert it to this type. */
1948 tree final_type = 0;
1950 /* Nonzero if this is an operation like MIN or MAX which can
1951 safely be computed in short if both args are promoted shorts.
1952 Also implies COMMON.
1953 -1 indicates a bitwise operation; this makes a difference
1954 in the exact conditions for when it is safe to do the operation
1955 in a narrower mode. */
1958 /* Nonzero if this is a comparison operation;
1959 if both args are promoted shorts, compare the original shorts.
1960 Also implies COMMON. */
1961 int short_compare = 0;
1963 /* Nonzero if this is a right-shift operation, which can be computed on the
1964 original short and then promoted if the operand is a promoted short. */
1965 int short_shift = 0;
1967 /* Nonzero means set RESULT_TYPE to the common type of the args. */
1972 op0 = default_conversion (orig_op0);
1973 op1 = default_conversion (orig_op1);
1981 type0 = TREE_TYPE (op0);
1982 type1 = TREE_TYPE (op1);
1984 /* The expression codes of the data types of the arguments tell us
1985 whether the arguments are integers, floating, pointers, etc. */
1986 code0 = TREE_CODE (type0);
1987 code1 = TREE_CODE (type1);
1989 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1990 STRIP_TYPE_NOPS (op0);
1991 STRIP_TYPE_NOPS (op1);
1993 /* If an error was already reported for one of the arguments,
1994 avoid reporting another error. */
1996 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
1997 return error_mark_node;
2002 /* Handle the pointer + int case. */
2003 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2004 return pointer_int_sum (PLUS_EXPR, op0, op1);
2005 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
2006 return pointer_int_sum (PLUS_EXPR, op1, op0);
2012 /* Subtraction of two similar pointers.
2013 We must subtract them as integers, then divide by object size. */
2014 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
2015 && comp_target_types (type0, type1))
2016 return pointer_diff (op0, op1);
2017 /* Handle pointer minus int. Just like pointer plus int. */
2018 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2019 return pointer_int_sum (MINUS_EXPR, op0, op1);
2028 case TRUNC_DIV_EXPR:
2030 case FLOOR_DIV_EXPR:
2031 case ROUND_DIV_EXPR:
2032 case EXACT_DIV_EXPR:
2033 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2034 || code0 == COMPLEX_TYPE)
2035 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2036 || code1 == COMPLEX_TYPE))
2038 if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
2039 resultcode = RDIV_EXPR;
2041 /* Although it would be tempting to shorten always here, that
2042 loses on some targets, since the modulo instruction is
2043 undefined if the quotient can't be represented in the
2044 computation mode. We shorten only if unsigned or if
2045 dividing by something we know != -1. */
2046 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2047 || (TREE_CODE (op1) == INTEGER_CST
2048 && ! integer_all_onesp (op1)));
2054 case BIT_ANDTC_EXPR:
2057 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2059 /* If one operand is a constant, and the other is a short type
2060 that has been converted to an int,
2061 really do the work in the short type and then convert the
2062 result to int. If we are lucky, the constant will be 0 or 1
2063 in the short type, making the entire operation go away. */
2064 if (TREE_CODE (op0) == INTEGER_CST
2065 && TREE_CODE (op1) == NOP_EXPR
2066 && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0)))
2067 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0))))
2069 final_type = result_type;
2070 op1 = TREE_OPERAND (op1, 0);
2071 result_type = TREE_TYPE (op1);
2073 if (TREE_CODE (op1) == INTEGER_CST
2074 && TREE_CODE (op0) == NOP_EXPR
2075 && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))
2076 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0))))
2078 final_type = result_type;
2079 op0 = TREE_OPERAND (op0, 0);
2080 result_type = TREE_TYPE (op0);
2084 case TRUNC_MOD_EXPR:
2085 case FLOOR_MOD_EXPR:
2086 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2088 /* Although it would be tempting to shorten always here, that loses
2089 on some targets, since the modulo instruction is undefined if the
2090 quotient can't be represented in the computation mode. We shorten
2091 only if unsigned or if dividing by something we know != -1. */
2092 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2093 || (TREE_CODE (op1) == INTEGER_CST
2094 && ! integer_all_onesp (op1)));
2099 case TRUTH_ANDIF_EXPR:
2100 case TRUTH_ORIF_EXPR:
2101 case TRUTH_AND_EXPR:
2103 case TRUTH_XOR_EXPR:
2104 if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
2105 || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2106 && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
2107 || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2109 /* Result of these operations is always an int,
2110 but that does not mean the operands should be
2111 converted to ints! */
2112 result_type = integer_type_node;
2113 op0 = truthvalue_conversion (op0);
2114 op1 = truthvalue_conversion (op1);
2119 /* Shift operations: result has same type as first operand;
2120 always convert second operand to int.
2121 Also set SHORT_SHIFT if shifting rightward. */
2124 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2126 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2128 if (tree_int_cst_sgn (op1) < 0)
2129 warning ("right shift count is negative");
2132 if (! integer_zerop (op1))
2135 if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2136 warning ("right shift count >= width of type");
2140 /* Use the type of the value to be shifted.
2141 This is what most traditional C compilers do. */
2142 result_type = type0;
2143 /* Unless traditional, convert the shift-count to an integer,
2144 regardless of size of value being shifted. */
2145 if (! flag_traditional)
2147 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2148 op1 = convert (integer_type_node, op1);
2149 /* Avoid converting op1 to result_type later. */
2156 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2158 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2160 if (tree_int_cst_sgn (op1) < 0)
2161 warning ("left shift count is negative");
2163 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2164 warning ("left shift count >= width of type");
2167 /* Use the type of the value to be shifted.
2168 This is what most traditional C compilers do. */
2169 result_type = type0;
2170 /* Unless traditional, convert the shift-count to an integer,
2171 regardless of size of value being shifted. */
2172 if (! flag_traditional)
2174 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2175 op1 = convert (integer_type_node, op1);
2176 /* Avoid converting op1 to result_type later. */
2184 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2186 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2188 if (tree_int_cst_sgn (op1) < 0)
2189 warning ("shift count is negative");
2190 else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0)
2191 warning ("shift count >= width of type");
2194 /* Use the type of the value to be shifted.
2195 This is what most traditional C compilers do. */
2196 result_type = type0;
2197 /* Unless traditional, convert the shift-count to an integer,
2198 regardless of size of value being shifted. */
2199 if (! flag_traditional)
2201 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2202 op1 = convert (integer_type_node, op1);
2203 /* Avoid converting op1 to result_type later. */
2211 if (warn_float_equal && (code0 == REAL_TYPE || code1 == REAL_TYPE))
2212 warning ("comparing floating point with == or != is unsafe");
2213 /* Result of comparison is always int,
2214 but don't convert the args to int! */
2215 build_type = integer_type_node;
2216 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2217 || code0 == COMPLEX_TYPE)
2218 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2219 || code1 == COMPLEX_TYPE))
2221 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2223 register tree tt0 = TREE_TYPE (type0);
2224 register tree tt1 = TREE_TYPE (type1);
2225 /* Anything compares with void *. void * compares with anything.
2226 Otherwise, the targets must be compatible
2227 and both must be object or both incomplete. */
2228 if (comp_target_types (type0, type1))
2229 result_type = common_type (type0, type1);
2230 else if (VOID_TYPE_P (tt0))
2232 /* op0 != orig_op0 detects the case of something
2233 whose value is 0 but which isn't a valid null ptr const. */
2234 if (pedantic && (!integer_zerop (op0) || op0 != orig_op0)
2235 && TREE_CODE (tt1) == FUNCTION_TYPE)
2236 pedwarn ("ISO C forbids comparison of `void *' with function pointer");
2238 else if (VOID_TYPE_P (tt1))
2240 if (pedantic && (!integer_zerop (op1) || op1 != orig_op1)
2241 && TREE_CODE (tt0) == FUNCTION_TYPE)
2242 pedwarn ("ISO C forbids comparison of `void *' with function pointer");
2245 pedwarn ("comparison of distinct pointer types lacks a cast");
2247 if (result_type == NULL_TREE)
2248 result_type = ptr_type_node;
2250 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2251 && integer_zerop (op1))
2252 result_type = type0;
2253 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2254 && integer_zerop (op0))
2255 result_type = type1;
2256 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2258 result_type = type0;
2259 if (! flag_traditional)
2260 pedwarn ("comparison between pointer and integer");
2262 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2264 result_type = type1;
2265 if (! flag_traditional)
2266 pedwarn ("comparison between pointer and integer");
2272 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2273 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2275 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2277 if (comp_target_types (type0, type1))
2279 result_type = common_type (type0, type1);
2281 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2282 pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
2286 result_type = ptr_type_node;
2287 pedwarn ("comparison of distinct pointer types lacks a cast");
2296 build_type = integer_type_node;
2297 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2298 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2300 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2302 if (comp_target_types (type0, type1))
2304 result_type = common_type (type0, type1);
2305 if (!COMPLETE_TYPE_P (TREE_TYPE (type0))
2306 != !COMPLETE_TYPE_P (TREE_TYPE (type1)))
2307 pedwarn ("comparison of complete and incomplete pointers");
2309 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2310 pedwarn ("ISO C forbids ordered comparisons of pointers to functions");
2314 result_type = ptr_type_node;
2315 pedwarn ("comparison of distinct pointer types lacks a cast");
2318 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2319 && integer_zerop (op1))
2321 result_type = type0;
2322 if (pedantic || extra_warnings)
2323 pedwarn ("ordered comparison of pointer with integer zero");
2325 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2326 && integer_zerop (op0))
2328 result_type = type1;
2330 pedwarn ("ordered comparison of pointer with integer zero");
2332 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2334 result_type = type0;
2335 if (! flag_traditional)
2336 pedwarn ("comparison between pointer and integer");
2338 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2340 result_type = type1;
2341 if (! flag_traditional)
2342 pedwarn ("comparison between pointer and integer");
2346 case UNORDERED_EXPR:
2353 build_type = integer_type_node;
2354 if (code0 != REAL_TYPE || code1 != REAL_TYPE)
2356 error ("unordered comparison on non-floating point argument");
2357 return error_mark_node;
2366 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2368 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2370 int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
2372 if (shorten || common || short_compare)
2373 result_type = common_type (type0, type1);
2375 /* For certain operations (which identify themselves by shorten != 0)
2376 if both args were extended from the same smaller type,
2377 do the arithmetic in that type and then extend.
2379 shorten !=0 and !=1 indicates a bitwise operation.
2380 For them, this optimization is safe only if
2381 both args are zero-extended or both are sign-extended.
2382 Otherwise, we might change the result.
2383 Eg, (short)-1 | (unsigned short)-1 is (int)-1
2384 but calculated in (unsigned short) it would be (unsigned short)-1. */
2386 if (shorten && none_complex)
2388 int unsigned0, unsigned1;
2389 tree arg0 = get_narrower (op0, &unsigned0);
2390 tree arg1 = get_narrower (op1, &unsigned1);
2391 /* UNS is 1 if the operation to be done is an unsigned one. */
2392 int uns = TREE_UNSIGNED (result_type);
2395 final_type = result_type;
2397 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
2398 but it *requires* conversion to FINAL_TYPE. */
2400 if ((TYPE_PRECISION (TREE_TYPE (op0))
2401 == TYPE_PRECISION (TREE_TYPE (arg0)))
2402 && TREE_TYPE (op0) != final_type)
2403 unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0));
2404 if ((TYPE_PRECISION (TREE_TYPE (op1))
2405 == TYPE_PRECISION (TREE_TYPE (arg1)))
2406 && TREE_TYPE (op1) != final_type)
2407 unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1));
2409 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
2411 /* For bitwise operations, signedness of nominal type
2412 does not matter. Consider only how operands were extended. */
2416 /* Note that in all three cases below we refrain from optimizing
2417 an unsigned operation on sign-extended args.
2418 That would not be valid. */
2420 /* Both args variable: if both extended in same way
2421 from same width, do it in that width.
2422 Do it unsigned if args were zero-extended. */
2423 if ((TYPE_PRECISION (TREE_TYPE (arg0))
2424 < TYPE_PRECISION (result_type))
2425 && (TYPE_PRECISION (TREE_TYPE (arg1))
2426 == TYPE_PRECISION (TREE_TYPE (arg0)))
2427 && unsigned0 == unsigned1
2428 && (unsigned0 || !uns))
2430 = signed_or_unsigned_type (unsigned0,
2431 common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
2432 else if (TREE_CODE (arg0) == INTEGER_CST
2433 && (unsigned1 || !uns)
2434 && (TYPE_PRECISION (TREE_TYPE (arg1))
2435 < TYPE_PRECISION (result_type))
2436 && (type = signed_or_unsigned_type (unsigned1,
2438 int_fits_type_p (arg0, type)))
2440 else if (TREE_CODE (arg1) == INTEGER_CST
2441 && (unsigned0 || !uns)
2442 && (TYPE_PRECISION (TREE_TYPE (arg0))
2443 < TYPE_PRECISION (result_type))
2444 && (type = signed_or_unsigned_type (unsigned0,
2446 int_fits_type_p (arg1, type)))
2450 /* Shifts can be shortened if shifting right. */
2455 tree arg0 = get_narrower (op0, &unsigned_arg);
2457 final_type = result_type;
2459 if (arg0 == op0 && final_type == TREE_TYPE (op0))
2460 unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0));
2462 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
2463 /* We can shorten only if the shift count is less than the
2464 number of bits in the smaller type size. */
2465 && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0
2466 /* If arg is sign-extended and then unsigned-shifted,
2467 we can simulate this with a signed shift in arg's type
2468 only if the extended result is at least twice as wide
2469 as the arg. Otherwise, the shift could use up all the
2470 ones made by sign-extension and bring in zeros.
2471 We can't optimize that case at all, but in most machines
2472 it never happens because available widths are 2**N. */
2473 && (!TREE_UNSIGNED (final_type)
2475 || (2 * TYPE_PRECISION (TREE_TYPE (arg0))
2476 <= TYPE_PRECISION (result_type))))
2478 /* Do an unsigned shift if the operand was zero-extended. */
2480 = signed_or_unsigned_type (unsigned_arg,
2482 /* Convert value-to-be-shifted to that type. */
2483 if (TREE_TYPE (op0) != result_type)
2484 op0 = convert (result_type, op0);
2489 /* Comparison operations are shortened too but differently.
2490 They identify themselves by setting short_compare = 1. */
2494 /* Don't write &op0, etc., because that would prevent op0
2495 from being kept in a register.
2496 Instead, make copies of the our local variables and
2497 pass the copies by reference, then copy them back afterward. */
2498 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
2499 enum tree_code xresultcode = resultcode;
2501 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
2506 op0 = xop0, op1 = xop1;
2508 resultcode = xresultcode;
2510 if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare != 0)
2511 && skip_evaluation == 0)
2513 int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0));
2514 int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1));
2515 int unsignedp0, unsignedp1;
2516 tree primop0 = get_narrower (op0, &unsignedp0);
2517 tree primop1 = get_narrower (op1, &unsignedp1);
2521 STRIP_TYPE_NOPS (xop0);
2522 STRIP_TYPE_NOPS (xop1);
2524 /* Give warnings for comparisons between signed and unsigned
2525 quantities that may fail.
2527 Do the checking based on the original operand trees, so that
2528 casts will be considered, but default promotions won't be.
2530 Do not warn if the comparison is being done in a signed type,
2531 since the signed type will only be chosen if it can represent
2532 all the values of the unsigned type. */
2533 if (! TREE_UNSIGNED (result_type))
2535 /* Do not warn if both operands are the same signedness. */
2536 else if (op0_signed == op1_signed)
2543 sop = xop0, uop = xop1;
2545 sop = xop1, uop = xop0;
2547 /* Do not warn if the signed quantity is an
2548 unsuffixed integer literal (or some static
2549 constant expression involving such literals or a
2550 conditional expression involving such literals)
2551 and it is non-negative. */
2552 if (tree_expr_nonnegative_p (sop))
2554 /* Do not warn if the comparison is an equality operation,
2555 the unsigned quantity is an integral constant, and it
2556 would fit in the result if the result were signed. */
2557 else if (TREE_CODE (uop) == INTEGER_CST
2558 && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
2559 && int_fits_type_p (uop, signed_type (result_type)))
2561 /* Do not warn if the unsigned quantity is an enumeration
2562 constant and its maximum value would fit in the result
2563 if the result were signed. */
2564 else if (TREE_CODE (uop) == INTEGER_CST
2565 && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
2566 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE(uop)),
2567 signed_type (result_type)))
2570 warning ("comparison between signed and unsigned");
2573 /* Warn if two unsigned values are being compared in a size
2574 larger than their original size, and one (and only one) is the
2575 result of a `~' operator. This comparison will always fail.
2577 Also warn if one operand is a constant, and the constant
2578 does not have all bits set that are set in the ~ operand
2579 when it is extended. */
2581 if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
2582 != (TREE_CODE (primop1) == BIT_NOT_EXPR))
2584 if (TREE_CODE (primop0) == BIT_NOT_EXPR)
2585 primop0 = get_narrower (TREE_OPERAND (primop0, 0),
2588 primop1 = get_narrower (TREE_OPERAND (primop1, 0),
2591 if (host_integerp (primop0, 0) || host_integerp (primop1, 0))
2594 HOST_WIDE_INT constant, mask;
2595 int unsignedp, bits;
2597 if (host_integerp (primop0, 0))
2600 unsignedp = unsignedp1;
2601 constant = tree_low_cst (primop0, 0);
2606 unsignedp = unsignedp0;
2607 constant = tree_low_cst (primop1, 0);
2610 bits = TYPE_PRECISION (TREE_TYPE (primop));
2611 if (bits < TYPE_PRECISION (result_type)
2612 && bits < HOST_BITS_PER_WIDE_INT && unsignedp)
2614 mask = (~ (HOST_WIDE_INT) 0) << bits;
2615 if ((mask & constant) != mask)
2616 warning ("comparison of promoted ~unsigned with constant");
2619 else if (unsignedp0 && unsignedp1
2620 && (TYPE_PRECISION (TREE_TYPE (primop0))
2621 < TYPE_PRECISION (result_type))
2622 && (TYPE_PRECISION (TREE_TYPE (primop1))
2623 < TYPE_PRECISION (result_type)))
2624 warning ("comparison of promoted ~unsigned with unsigned");
2630 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
2631 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
2632 Then the expression will be built.
2633 It will be given type FINAL_TYPE if that is nonzero;
2634 otherwise, it will be given type RESULT_TYPE. */
2638 binary_op_error (code);
2639 return error_mark_node;
2644 if (TREE_TYPE (op0) != result_type)
2645 op0 = convert (result_type, op0);
2646 if (TREE_TYPE (op1) != result_type)
2647 op1 = convert (result_type, op1);
2650 if (build_type == NULL_TREE)
2651 build_type = result_type;
2654 register tree result = build (resultcode, build_type, op0, op1);
2655 register tree folded;
2657 folded = fold (result);
2658 if (folded == result)
2659 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2660 if (final_type != 0)
2661 return convert (final_type, folded);
2666 /* Return a tree for the sum or difference (RESULTCODE says which)
2667 of pointer PTROP and integer INTOP. */
2670 pointer_int_sum (resultcode, ptrop, intop)
2671 enum tree_code resultcode;
2672 register tree ptrop, intop;
2676 register tree result;
2677 register tree folded;
2679 /* The result is a pointer of the same type that is being added. */
2681 register tree result_type = TREE_TYPE (ptrop);
2683 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
2685 if (pedantic || warn_pointer_arith)
2686 pedwarn ("pointer of type `void *' used in arithmetic");
2687 size_exp = integer_one_node;
2689 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
2691 if (pedantic || warn_pointer_arith)
2692 pedwarn ("pointer to a function used in arithmetic");
2693 size_exp = integer_one_node;
2696 size_exp = c_size_in_bytes (TREE_TYPE (result_type));
2698 /* If what we are about to multiply by the size of the elements
2699 contains a constant term, apply distributive law
2700 and multiply that constant term separately.
2701 This helps produce common subexpressions. */
2703 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
2704 && ! TREE_CONSTANT (intop)
2705 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
2706 && TREE_CONSTANT (size_exp)
2707 /* If the constant comes from pointer subtraction,
2708 skip this optimization--it would cause an error. */
2709 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
2710 /* If the constant is unsigned, and smaller than the pointer size,
2711 then we must skip this optimization. This is because it could cause
2712 an overflow error if the constant is negative but INTOP is not. */
2713 && (! TREE_UNSIGNED (TREE_TYPE (intop))
2714 || (TYPE_PRECISION (TREE_TYPE (intop))
2715 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
2717 enum tree_code subcode = resultcode;
2718 tree int_type = TREE_TYPE (intop);
2719 if (TREE_CODE (intop) == MINUS_EXPR)
2720 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
2721 /* Convert both subexpression types to the type of intop,
2722 because weird cases involving pointer arithmetic
2723 can result in a sum or difference with different type args. */
2724 ptrop = build_binary_op (subcode, ptrop,
2725 convert (int_type, TREE_OPERAND (intop, 1)), 1);
2726 intop = convert (int_type, TREE_OPERAND (intop, 0));
2729 /* Convert the integer argument to a type the same size as sizetype
2730 so the multiply won't overflow spuriously. */
2732 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
2733 || TREE_UNSIGNED (TREE_TYPE (intop)) != TREE_UNSIGNED (sizetype))
2734 intop = convert (type_for_size (TYPE_PRECISION (sizetype),
2735 TREE_UNSIGNED (sizetype)), intop);
2737 /* Replace the integer argument with a suitable product by the object size.
2738 Do this multiplication as signed, then convert to the appropriate
2739 pointer type (actually unsigned integral). */
2741 intop = convert (result_type,
2742 build_binary_op (MULT_EXPR, intop,
2743 convert (TREE_TYPE (intop), size_exp), 1));
2745 /* Create the sum or difference. */
2747 result = build (resultcode, result_type, ptrop, intop);
2749 folded = fold (result);
2750 if (folded == result)
2751 TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop);
2755 /* Return a tree for the difference of pointers OP0 and OP1.
2756 The resulting tree has type int. */
2759 pointer_diff (op0, op1)
2760 register tree op0, op1;
2762 register tree result, folded;
2763 tree restype = ptrdiff_type_node;
2765 tree target_type = TREE_TYPE (TREE_TYPE (op0));
2767 if (pedantic || warn_pointer_arith)
2769 if (TREE_CODE (target_type) == VOID_TYPE)
2770 pedwarn ("pointer of type `void *' used in subtraction");
2771 if (TREE_CODE (target_type) == FUNCTION_TYPE)
2772 pedwarn ("pointer to a function used in subtraction");
2775 /* First do the subtraction as integers;
2776 then drop through to build the divide operator.
2777 Do not do default conversions on the minus operator
2778 in case restype is a short type. */
2780 op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
2781 convert (restype, op1), 0);
2782 /* This generates an error if op1 is pointer to incomplete type. */
2783 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (op1))))
2784 error ("arithmetic on pointer to an incomplete type");
2786 /* This generates an error if op0 is pointer to incomplete type. */
2787 op1 = c_size_in_bytes (target_type);
2789 /* Divide by the size, in easiest possible way. */
2791 result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
2793 folded = fold (result);
2794 if (folded == result)
2795 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2799 /* Construct and perhaps optimize a tree representation
2800 for a unary operation. CODE, a tree_code, specifies the operation
2801 and XARG is the operand. NOCONVERT nonzero suppresses
2802 the default promotions (such as from short to int). */
2805 build_unary_op (code, xarg, noconvert)
2806 enum tree_code code;
2810 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
2811 register tree arg = xarg;
2812 register tree argtype = 0;
2813 register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
2816 if (typecode == ERROR_MARK)
2817 return error_mark_node;
2818 if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE)
2819 typecode = INTEGER_TYPE;
2824 /* This is used for unary plus, because a CONVERT_EXPR
2825 is enough to prevent anybody from looking inside for
2826 associativity, but won't generate any code. */
2827 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2828 || typecode == COMPLEX_TYPE))
2830 error ("wrong type argument to unary plus");
2831 return error_mark_node;
2833 else if (!noconvert)
2834 arg = default_conversion (arg);
2838 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2839 || typecode == COMPLEX_TYPE))
2841 error ("wrong type argument to unary minus");
2842 return error_mark_node;
2844 else if (!noconvert)
2845 arg = default_conversion (arg);
2849 if (typecode == COMPLEX_TYPE)
2853 pedwarn ("ISO C does not support `~' for complex conjugation");
2855 arg = default_conversion (arg);
2857 else if (typecode != INTEGER_TYPE)
2859 error ("wrong type argument to bit-complement");
2860 return error_mark_node;
2862 else if (!noconvert)
2863 arg = default_conversion (arg);
2867 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2868 || typecode == COMPLEX_TYPE))
2870 error ("wrong type argument to abs");
2871 return error_mark_node;
2873 else if (!noconvert)
2874 arg = default_conversion (arg);
2878 /* Conjugating a real value is a no-op, but allow it anyway. */
2879 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2880 || typecode == COMPLEX_TYPE))
2882 error ("wrong type argument to conjugation");
2883 return error_mark_node;
2885 else if (!noconvert)
2886 arg = default_conversion (arg);
2889 case TRUTH_NOT_EXPR:
2890 if (typecode != INTEGER_TYPE
2891 && typecode != REAL_TYPE && typecode != POINTER_TYPE
2892 && typecode != COMPLEX_TYPE
2893 /* These will convert to a pointer. */
2894 && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE)
2896 error ("wrong type argument to unary exclamation mark");
2897 return error_mark_node;
2899 arg = truthvalue_conversion (arg);
2900 return invert_truthvalue (arg);
2906 if (TREE_CODE (arg) == COMPLEX_CST)
2907 return TREE_REALPART (arg);
2908 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2909 return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2914 if (TREE_CODE (arg) == COMPLEX_CST)
2915 return TREE_IMAGPART (arg);
2916 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2917 return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2919 return convert (TREE_TYPE (arg), integer_zero_node);
2921 case PREINCREMENT_EXPR:
2922 case POSTINCREMENT_EXPR:
2923 case PREDECREMENT_EXPR:
2924 case POSTDECREMENT_EXPR:
2925 /* Handle complex lvalues (when permitted)
2926 by reduction to simpler cases. */
2928 val = unary_complex_lvalue (code, arg);
2932 /* Increment or decrement the real part of the value,
2933 and don't change the imaginary part. */
2934 if (typecode == COMPLEX_TYPE)
2939 pedwarn ("ISO C does not support `++' and `--' on complex types");
2941 arg = stabilize_reference (arg);
2942 real = build_unary_op (REALPART_EXPR, arg, 1);
2943 imag = build_unary_op (IMAGPART_EXPR, arg, 1);
2944 return build (COMPLEX_EXPR, TREE_TYPE (arg),
2945 build_unary_op (code, real, 1), imag);
2948 /* Report invalid types. */
2950 if (typecode != POINTER_TYPE
2951 && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
2953 error ("wrong type argument to %s",
2954 code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR
2955 ? "increment" : "decrement");
2956 return error_mark_node;
2961 tree result_type = TREE_TYPE (arg);
2963 arg = get_unwidened (arg, 0);
2964 argtype = TREE_TYPE (arg);
2966 /* Compute the increment. */
2968 if (typecode == POINTER_TYPE)
2970 /* If pointer target is an undefined struct,
2971 we just cannot know how to do the arithmetic. */
2972 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type)))
2973 error ("%s of pointer to unknown structure",
2974 code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR
2975 ? "increment" : "decrement");
2976 else if ((pedantic || warn_pointer_arith)
2977 && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
2978 || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
2979 pedwarn ("wrong type argument to %s",
2980 code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR
2981 ? "increment" : "decrement");
2982 inc = c_size_in_bytes (TREE_TYPE (result_type));
2985 inc = integer_one_node;
2987 inc = convert (argtype, inc);
2989 /* Handle incrementing a cast-expression. */
2992 switch (TREE_CODE (arg))
2997 case FIX_TRUNC_EXPR:
2998 case FIX_FLOOR_EXPR:
2999 case FIX_ROUND_EXPR:
3001 pedantic_lvalue_warning (CONVERT_EXPR);
3002 /* If the real type has the same machine representation
3003 as the type it is cast to, we can make better output
3004 by adding directly to the inside of the cast. */
3005 if ((TREE_CODE (TREE_TYPE (arg))
3006 == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))))
3007 && (TYPE_MODE (TREE_TYPE (arg))
3008 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0)))))
3009 arg = TREE_OPERAND (arg, 0);
3012 tree incremented, modify, value;
3013 if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
3014 value = boolean_increment (code, arg);
3017 arg = stabilize_reference (arg);
3018 if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR)
3021 value = save_expr (arg);
3022 incremented = build (((code == PREINCREMENT_EXPR
3023 || code == POSTINCREMENT_EXPR)
3024 ? PLUS_EXPR : MINUS_EXPR),
3025 argtype, value, inc);
3026 TREE_SIDE_EFFECTS (incremented) = 1;
3027 modify = build_modify_expr (arg, NOP_EXPR, incremented);
3028 value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value);
3030 TREE_USED (value) = 1;
3040 /* Complain about anything else that is not a true lvalue. */
3041 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
3042 || code == POSTINCREMENT_EXPR)
3043 ? "invalid lvalue in increment"
3044 : "invalid lvalue in decrement")))
3045 return error_mark_node;
3047 /* Report a read-only lvalue. */
3048 if (TREE_READONLY (arg))
3049 readonly_warning (arg,
3050 ((code == PREINCREMENT_EXPR
3051 || code == POSTINCREMENT_EXPR)
3052 ? "increment" : "decrement"));
3054 if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE)
3055 val = boolean_increment (code, arg);
3057 val = build (code, TREE_TYPE (arg), arg, inc);
3058 TREE_SIDE_EFFECTS (val) = 1;
3059 val = convert (result_type, val);
3060 if (TREE_CODE (val) != code)
3061 TREE_NO_UNUSED_WARNING (val) = 1;
3066 /* Note that this operation never does default_conversion
3067 regardless of NOCONVERT. */
3069 /* Let &* cancel out to simplify resulting code. */
3070 if (TREE_CODE (arg) == INDIRECT_REF)
3072 /* Don't let this be an lvalue. */
3073 if (lvalue_p (TREE_OPERAND (arg, 0)))
3074 return non_lvalue (TREE_OPERAND (arg, 0));
3075 return TREE_OPERAND (arg, 0);
3078 /* For &x[y], return x+y */
3079 if (TREE_CODE (arg) == ARRAY_REF)
3081 if (mark_addressable (TREE_OPERAND (arg, 0)) == 0)
3082 return error_mark_node;
3083 return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
3084 TREE_OPERAND (arg, 1), 1);
3087 /* Handle complex lvalues (when permitted)
3088 by reduction to simpler cases. */
3089 val = unary_complex_lvalue (code, arg);
3093 #if 0 /* Turned off because inconsistent;
3094 float f; *&(int)f = 3.4 stores in int format
3095 whereas (int)f = 3.4 stores in float format. */
3096 /* Address of a cast is just a cast of the address
3097 of the operand of the cast. */
3098 switch (TREE_CODE (arg))
3103 case FIX_TRUNC_EXPR:
3104 case FIX_FLOOR_EXPR:
3105 case FIX_ROUND_EXPR:
3108 pedwarn ("ISO C forbids the address of a cast expression");
3109 return convert (build_pointer_type (TREE_TYPE (arg)),
3110 build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0),
3115 /* Allow the address of a constructor if all the elements
3117 if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg))
3119 /* Anything not already handled and not a true memory reference
3121 else if (typecode != FUNCTION_TYPE
3122 && !lvalue_or_else (arg, "invalid lvalue in unary `&'"))
3123 return error_mark_node;
3125 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
3126 argtype = TREE_TYPE (arg);
3128 /* If the lvalue is const or volatile, merge that into the type
3129 to which the address will point. Note that you can't get a
3130 restricted pointer by taking the address of something, so we
3131 only have to deal with `const' and `volatile' here. */
3132 if ((DECL_P (arg) || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r')
3133 && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)))
3134 argtype = c_build_type_variant (argtype,
3135 TREE_READONLY (arg),
3136 TREE_THIS_VOLATILE (arg));
3138 argtype = build_pointer_type (argtype);
3140 if (mark_addressable (arg) == 0)
3141 return error_mark_node;
3146 if (TREE_CODE (arg) == COMPONENT_REF)
3148 tree field = TREE_OPERAND (arg, 1);
3150 addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0);
3152 if (DECL_C_BIT_FIELD (field))
3154 error ("attempt to take address of bit-field structure member `%s'",
3155 IDENTIFIER_POINTER (DECL_NAME (field)));
3156 return error_mark_node;
3159 addr = fold (build (PLUS_EXPR, argtype,
3160 convert (argtype, addr),
3161 convert (argtype, byte_position (field))));
3164 addr = build1 (code, argtype, arg);
3166 /* Address of a static or external variable or
3167 file-scope function counts as a constant. */
3169 && ! (TREE_CODE (arg) == FUNCTION_DECL
3170 && DECL_CONTEXT (arg) != 0))
3171 TREE_CONSTANT (addr) = 1;
3180 argtype = TREE_TYPE (arg);
3181 return fold (build1 (code, argtype, arg));
3185 /* If CONVERSIONS is a conversion expression or a nested sequence of such,
3186 convert ARG with the same conversions in the same order
3187 and return the result. */
3190 convert_sequence (conversions, arg)
3194 switch (TREE_CODE (conversions))
3199 case FIX_TRUNC_EXPR:
3200 case FIX_FLOOR_EXPR:
3201 case FIX_ROUND_EXPR:
3203 return convert (TREE_TYPE (conversions),
3204 convert_sequence (TREE_OPERAND (conversions, 0),
3213 /* Return nonzero if REF is an lvalue valid for this language.
3214 Lvalues can be assigned, unless their type has TYPE_READONLY.
3215 Lvalues can have their address taken, unless they have DECL_REGISTER. */
3221 register enum tree_code code = TREE_CODE (ref);
3228 return lvalue_p (TREE_OPERAND (ref, 0));
3239 return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
3240 && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
3244 return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
3251 /* Return nonzero if REF is an lvalue valid for this language;
3252 otherwise, print an error message and return zero. */
3255 lvalue_or_else (ref, msgid)
3259 int win = lvalue_p (ref);
3262 error ("%s", msgid);
3267 /* Apply unary lvalue-demanding operator CODE to the expression ARG
3268 for certain kinds of expressions which are not really lvalues
3269 but which we can accept as lvalues.
3271 If ARG is not a kind of expression we can handle, return zero. */
3274 unary_complex_lvalue (code, arg)
3275 enum tree_code code;
3278 /* Handle (a, b) used as an "lvalue". */
3279 if (TREE_CODE (arg) == COMPOUND_EXPR)
3281 tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0);
3283 /* If this returns a function type, it isn't really being used as
3284 an lvalue, so don't issue a warning about it. */
3285 if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE)
3286 pedantic_lvalue_warning (COMPOUND_EXPR);
3288 return build (COMPOUND_EXPR, TREE_TYPE (real_result),
3289 TREE_OPERAND (arg, 0), real_result);
3292 /* Handle (a ? b : c) used as an "lvalue". */
3293 if (TREE_CODE (arg) == COND_EXPR)
3295 pedantic_lvalue_warning (COND_EXPR);
3296 if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE)
3297 pedantic_lvalue_warning (COMPOUND_EXPR);
3299 return (build_conditional_expr
3300 (TREE_OPERAND (arg, 0),
3301 build_unary_op (code, TREE_OPERAND (arg, 1), 0),
3302 build_unary_op (code, TREE_OPERAND (arg, 2), 0)));
3308 /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR
3309 COMPOUND_EXPR, or CONVERT_EXPR (for casts). */
3312 pedantic_lvalue_warning (code)
3313 enum tree_code code;
3319 pedwarn ("ISO C forbids use of conditional expressions as lvalues");
3322 pedwarn ("ISO C forbids use of compound expressions as lvalues");
3325 pedwarn ("ISO C forbids use of cast expressions as lvalues");
3330 /* Warn about storing in something that is `const'. */
3333 readonly_warning (arg, msgid)
3337 if (TREE_CODE (arg) == COMPONENT_REF)
3339 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
3340 readonly_warning (TREE_OPERAND (arg, 0), msgid);
3342 pedwarn ("%s of read-only member `%s'", _(msgid),
3343 IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1))));
3345 else if (TREE_CODE (arg) == VAR_DECL)
3346 pedwarn ("%s of read-only variable `%s'", _(msgid),
3347 IDENTIFIER_POINTER (DECL_NAME (arg)));
3349 pedwarn ("%s of read-only location", _(msgid));
3352 /* Mark EXP saying that we need to be able to take the
3353 address of it; it should not be allocated in a register.
3354 Value is 1 if successful. */
3357 mark_addressable (exp)
3360 register tree x = exp;
3362 switch (TREE_CODE (x))
3365 if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
3367 error ("cannot take address of bitfield `%s'",
3368 IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1))));
3372 /* ... fall through ... */
3378 x = TREE_OPERAND (x, 0);
3382 TREE_ADDRESSABLE (x) = 1;
3389 if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)
3390 && DECL_NONLOCAL (x))
3392 if (TREE_PUBLIC (x))
3394 error ("global register variable `%s' used in nested function",
3395 IDENTIFIER_POINTER (DECL_NAME (x)));
3398 pedwarn ("register variable `%s' used in nested function",
3399 IDENTIFIER_POINTER (DECL_NAME (x)));
3401 else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x))
3403 if (TREE_PUBLIC (x))
3405 error ("address of global register variable `%s' requested",
3406 IDENTIFIER_POINTER (DECL_NAME (x)));
3410 /* If we are making this addressable due to its having
3411 volatile components, give a different error message. Also
3412 handle the case of an unnamed parameter by not trying
3413 to give the name. */
3415 else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x)))
3417 error ("cannot put object with volatile field into register");
3421 pedwarn ("address of register variable `%s' requested",
3422 IDENTIFIER_POINTER (DECL_NAME (x)));
3424 put_var_into_stack (x);
3428 TREE_ADDRESSABLE (x) = 1;
3429 #if 0 /* poplevel deals with this now. */
3430 if (DECL_CONTEXT (x) == 0)
3431 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1;
3439 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
3442 build_conditional_expr (ifexp, op1, op2)
3443 tree ifexp, op1, op2;
3445 register tree type1;
3446 register tree type2;
3447 register enum tree_code code1;
3448 register enum tree_code code2;
3449 register tree result_type = NULL;
3450 tree orig_op1 = op1, orig_op2 = op2;
3452 ifexp = truthvalue_conversion (default_conversion (ifexp));
3454 #if 0 /* Produces wrong result if within sizeof. */
3455 /* Don't promote the operands separately if they promote
3456 the same way. Return the unpromoted type and let the combined
3457 value get promoted if necessary. */
3459 if (TREE_TYPE (op1) == TREE_TYPE (op2)
3460 && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE
3461 && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE
3462 && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE)
3464 if (TREE_CODE (ifexp) == INTEGER_CST)
3465 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3467 return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2));
3471 /* Promote both alternatives. */
3473 if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
3474 op1 = default_conversion (op1);
3475 if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
3476 op2 = default_conversion (op2);
3478 if (TREE_CODE (ifexp) == ERROR_MARK
3479 || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
3480 || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
3481 return error_mark_node;
3483 type1 = TREE_TYPE (op1);
3484 code1 = TREE_CODE (type1);
3485 type2 = TREE_TYPE (op2);
3486 code2 = TREE_CODE (type2);
3488 /* Quickly detect the usual case where op1 and op2 have the same type
3490 if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
3493 result_type = type1;
3495 result_type = TYPE_MAIN_VARIANT (type1);
3497 else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE
3498 || code1 == COMPLEX_TYPE)
3499 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE
3500 || code2 == COMPLEX_TYPE))
3502 result_type = common_type (type1, type2);
3504 /* If -Wsign-compare, warn here if type1 and type2 have
3505 different signedness. We'll promote the signed to unsigned
3506 and later code won't know it used to be different.
3507 Do this check on the original types, so that explicit casts
3508 will be considered, but default promotions won't. */
3509 if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare)
3510 && !skip_evaluation)
3512 int unsigned_op1 = TREE_UNSIGNED (TREE_TYPE (orig_op1));
3513 int unsigned_op2 = TREE_UNSIGNED (TREE_TYPE (orig_op2));
3515 if (unsigned_op1 ^ unsigned_op2)
3517 /* Do not warn if the result type is signed, since the
3518 signed type will only be chosen if it can represent
3519 all the values of the unsigned type. */
3520 if (! TREE_UNSIGNED (result_type))
3522 /* Do not warn if the signed quantity is an unsuffixed
3523 integer literal (or some static constant expression
3524 involving such literals) and it is non-negative. */
3525 else if ((unsigned_op2 && tree_expr_nonnegative_p (op1))
3526 || (unsigned_op1 && tree_expr_nonnegative_p (op2)))
3529 warning ("signed and unsigned type in conditional expression");
3533 else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
3535 if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
3536 pedwarn ("ISO C forbids conditional expr with only one void side");
3537 result_type = void_type_node;
3539 else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
3541 if (comp_target_types (type1, type2))
3542 result_type = common_type (type1, type2);
3543 else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node
3544 && TREE_CODE (orig_op1) != NOP_EXPR)
3545 result_type = qualify_type (type2, type1);
3546 else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node
3547 && TREE_CODE (orig_op2) != NOP_EXPR)
3548 result_type = qualify_type (type1, type2);
3549 else if (VOID_TYPE_P (TREE_TYPE (type1)))
3551 if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
3552 pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
3553 result_type = build_pointer_type (qualify_type (TREE_TYPE (type1),
3554 TREE_TYPE (type2)));
3556 else if (VOID_TYPE_P (TREE_TYPE (type2)))
3558 if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
3559 pedwarn ("ISO C forbids conditional expr between `void *' and function pointer");
3560 result_type = build_pointer_type (qualify_type (TREE_TYPE (type2),
3561 TREE_TYPE (type1)));
3565 pedwarn ("pointer type mismatch in conditional expression");
3566 result_type = build_pointer_type (void_type_node);
3569 else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
3571 if (! integer_zerop (op2))
3572 pedwarn ("pointer/integer type mismatch in conditional expression");
3575 op2 = null_pointer_node;
3577 result_type = type1;
3579 else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
3581 if (!integer_zerop (op1))
3582 pedwarn ("pointer/integer type mismatch in conditional expression");
3585 op1 = null_pointer_node;
3587 result_type = type2;
3592 if (flag_cond_mismatch)
3593 result_type = void_type_node;
3596 error ("type mismatch in conditional expression");
3597 return error_mark_node;
3601 /* Merge const and volatile flags of the incoming types. */
3603 = build_type_variant (result_type,
3604 TREE_READONLY (op1) || TREE_READONLY (op2),
3605 TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
3607 if (result_type != TREE_TYPE (op1))
3608 op1 = convert_and_check (result_type, op1);
3609 if (result_type != TREE_TYPE (op2))
3610 op2 = convert_and_check (result_type, op2);
3612 if (TREE_CODE (ifexp) == INTEGER_CST)
3613 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3615 return fold (build (COND_EXPR, result_type, ifexp, op1, op2));
3618 /* Given a list of expressions, return a compound expression
3619 that performs them all and returns the value of the last of them. */
3622 build_compound_expr (list)
3625 return internal_build_compound_expr (list, TRUE);
3629 internal_build_compound_expr (list, first_p)
3635 if (TREE_CHAIN (list) == 0)
3637 #if 0 /* If something inside inhibited lvalueness, we should not override. */
3638 /* Consider (x, y+0), which is not an lvalue since y+0 is not. */
3640 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3641 if (TREE_CODE (list) == NON_LVALUE_EXPR)
3642 list = TREE_OPERAND (list, 0);
3645 /* Don't let (0, 0) be null pointer constant. */
3646 if (!first_p && integer_zerop (TREE_VALUE (list)))
3647 return non_lvalue (TREE_VALUE (list));
3648 return TREE_VALUE (list);
3651 if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0)
3653 /* Convert arrays to pointers when there really is a comma operator. */
3654 if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE)
3655 TREE_VALUE (TREE_CHAIN (list))
3656 = default_conversion (TREE_VALUE (TREE_CHAIN (list)));
3659 rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE);
3661 if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)))
3663 /* The left-hand operand of a comma expression is like an expression
3664 statement: with -W or -Wunused, we should warn if it doesn't have
3665 any side-effects, unless it was explicitly cast to (void). */
3666 if ((extra_warnings || warn_unused_value)
3667 && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR
3668 && VOID_TYPE_P (TREE_TYPE (TREE_VALUE (list)))))
3669 warning ("left-hand operand of comma expression has no effect");
3671 /* When pedantic, a compound expression can be neither an lvalue
3672 nor an integer constant expression. */
3677 /* With -Wunused, we should also warn if the left-hand operand does have
3678 side-effects, but computes a value which is not used. For example, in
3679 `foo() + bar(), baz()' the result of the `+' operator is not used,
3680 so we should issue a warning. */
3681 else if (warn_unused_value)
3682 warn_if_unused_value (TREE_VALUE (list));
3684 return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest);
3687 /* Build an expression representing a cast to type TYPE of expression EXPR. */
3690 build_c_cast (type, expr)
3694 register tree value = expr;
3696 if (type == error_mark_node || expr == error_mark_node)
3697 return error_mark_node;
3698 type = TYPE_MAIN_VARIANT (type);
3701 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3702 if (TREE_CODE (value) == NON_LVALUE_EXPR)
3703 value = TREE_OPERAND (value, 0);
3706 if (TREE_CODE (type) == ARRAY_TYPE)
3708 error ("cast specifies array type");
3709 return error_mark_node;
3712 if (TREE_CODE (type) == FUNCTION_TYPE)
3714 error ("cast specifies function type");
3715 return error_mark_node;
3718 if (type == TREE_TYPE (value))
3722 if (TREE_CODE (type) == RECORD_TYPE
3723 || TREE_CODE (type) == UNION_TYPE)
3724 pedwarn ("ISO C forbids casting nonscalar to the same type");
3727 else if (TREE_CODE (type) == UNION_TYPE)
3730 if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
3731 || TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE)
3732 value = default_conversion (value);
3734 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3735 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
3736 TYPE_MAIN_VARIANT (TREE_TYPE (value))))
3745 pedwarn ("ISO C forbids casts to union type");
3746 if (TYPE_NAME (type) != 0)
3748 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3749 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3751 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3755 t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE,
3756 build_tree_list (field, value)),
3758 TREE_CONSTANT (t) = TREE_CONSTANT (value);
3761 error ("cast to union type from type not present in union");
3762 return error_mark_node;
3768 /* If casting to void, avoid the error that would come
3769 from default_conversion in the case of a non-lvalue array. */
3770 if (type == void_type_node)
3771 return build1 (CONVERT_EXPR, type, value);
3773 /* Convert functions and arrays to pointers,
3774 but don't convert any other types. */
3775 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
3776 || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE)
3777 value = default_conversion (value);
3778 otype = TREE_TYPE (value);
3780 /* Optionally warn about potentially worrisome casts. */
3783 && TREE_CODE (type) == POINTER_TYPE
3784 && TREE_CODE (otype) == POINTER_TYPE)
3786 tree in_type = type;
3787 tree in_otype = otype;
3790 /* Check that the qualifiers on IN_TYPE are a superset of
3791 the qualifiers of IN_OTYPE. The outermost level of
3792 POINTER_TYPE nodes is uninteresting and we stop as soon
3793 as we hit a non-POINTER_TYPE node on either type. */
3796 in_otype = TREE_TYPE (in_otype);
3797 in_type = TREE_TYPE (in_type);
3798 warn |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type));
3800 while (TREE_CODE (in_type) == POINTER_TYPE
3801 && TREE_CODE (in_otype) == POINTER_TYPE);
3804 /* There are qualifiers present in IN_OTYPE that are not
3805 present in IN_TYPE. */
3806 warning ("cast discards qualifiers from pointer target type");
3809 /* Warn about possible alignment problems. */
3810 if (STRICT_ALIGNMENT && warn_cast_align
3811 && TREE_CODE (type) == POINTER_TYPE
3812 && TREE_CODE (otype) == POINTER_TYPE
3813 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
3814 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
3815 /* Don't warn about opaque types, where the actual alignment
3816 restriction is unknown. */
3817 && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
3818 || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
3819 && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
3820 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
3821 warning ("cast increases required alignment of target type");
3823 if (TREE_CODE (type) == INTEGER_TYPE
3824 && TREE_CODE (otype) == POINTER_TYPE
3825 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3826 && !TREE_CONSTANT (value))
3827 warning ("cast from pointer to integer of different size");
3829 if (warn_bad_function_cast
3830 && TREE_CODE (value) == CALL_EXPR
3831 && TREE_CODE (type) != TREE_CODE (otype))
3832 warning ("cast does not match function type");
3834 if (TREE_CODE (type) == POINTER_TYPE
3835 && TREE_CODE (otype) == INTEGER_TYPE
3836 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3837 /* Don't warn about converting any constant. */
3838 && !TREE_CONSTANT (value))
3839 warning ("cast to pointer from integer of different size");
3842 value = convert (type, value);
3844 /* Ignore any integer overflow caused by the cast. */
3845 if (TREE_CODE (value) == INTEGER_CST)
3847 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
3848 TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
3852 /* Pedantically, don't ley (void *) (FOO *) 0 be a null pointer constant. */
3853 if (pedantic && TREE_CODE (value) == INTEGER_CST
3854 && TREE_CODE (expr) == INTEGER_CST
3855 && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)
3856 value = non_lvalue (value);
3858 /* If pedantic, don't let a cast be an lvalue. */
3859 if (value == expr && pedantic)
3860 value = non_lvalue (value);
3865 /* Build an assignment expression of lvalue LHS from value RHS.
3866 MODIFYCODE is the code for a binary operator that we use
3867 to combine the old value of LHS with RHS to get the new value.
3868 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
3871 build_modify_expr (lhs, modifycode, rhs)
3873 enum tree_code modifycode;
3875 register tree result;
3877 tree lhstype = TREE_TYPE (lhs);
3878 tree olhstype = lhstype;
3880 /* Types that aren't fully specified cannot be used in assignments. */
3881 lhs = require_complete_type (lhs);
3883 /* Avoid duplicate error messages from operands that had errors. */
3884 if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
3885 return error_mark_node;
3887 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3888 /* Do not use STRIP_NOPS here. We do not want an enumerator
3889 whose value is 0 to count as a null pointer constant. */
3890 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
3891 rhs = TREE_OPERAND (rhs, 0);
3895 /* Handle control structure constructs used as "lvalues". */
3897 switch (TREE_CODE (lhs))
3899 /* Handle (a, b) used as an "lvalue". */
3901 pedantic_lvalue_warning (COMPOUND_EXPR);
3902 newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), modifycode, rhs);
3903 if (TREE_CODE (newrhs) == ERROR_MARK)
3904 return error_mark_node;
3905 return build (COMPOUND_EXPR, lhstype,
3906 TREE_OPERAND (lhs, 0), newrhs);
3908 /* Handle (a ? b : c) used as an "lvalue". */
3910 pedantic_lvalue_warning (COND_EXPR);
3911 rhs = save_expr (rhs);
3913 /* Produce (a ? (b = rhs) : (c = rhs))
3914 except that the RHS goes through a save-expr
3915 so the code to compute it is only emitted once. */
3917 = build_conditional_expr (TREE_OPERAND (lhs, 0),
3918 build_modify_expr (TREE_OPERAND (lhs, 1),
3920 build_modify_expr (TREE_OPERAND (lhs, 2),
3922 if (TREE_CODE (cond) == ERROR_MARK)
3924 /* Make sure the code to compute the rhs comes out
3925 before the split. */
3926 return build (COMPOUND_EXPR, TREE_TYPE (lhs),
3927 /* But cast it to void to avoid an "unused" error. */
3928 convert (void_type_node, rhs), cond);
3934 /* If a binary op has been requested, combine the old LHS value with the RHS
3935 producing the value we should actually store into the LHS. */
3937 if (modifycode != NOP_EXPR)
3939 lhs = stabilize_reference (lhs);
3940 newrhs = build_binary_op (modifycode, lhs, rhs, 1);
3943 /* Handle a cast used as an "lvalue".
3944 We have already performed any binary operator using the value as cast.
3945 Now convert the result to the cast type of the lhs,
3946 and then true type of the lhs and store it there;
3947 then convert result back to the cast type to be the value
3948 of the assignment. */
3950 switch (TREE_CODE (lhs))
3955 case FIX_TRUNC_EXPR:
3956 case FIX_FLOOR_EXPR:
3957 case FIX_ROUND_EXPR:
3959 if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE
3960 || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE)
3961 newrhs = default_conversion (newrhs);
3963 tree inner_lhs = TREE_OPERAND (lhs, 0);
3965 result = build_modify_expr (inner_lhs, NOP_EXPR,
3966 convert (TREE_TYPE (inner_lhs),
3967 convert (lhstype, newrhs)));
3968 if (TREE_CODE (result) == ERROR_MARK)
3970 pedantic_lvalue_warning (CONVERT_EXPR);
3971 return convert (TREE_TYPE (lhs), result);
3978 /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
3979 Reject anything strange now. */
3981 if (!lvalue_or_else (lhs, "invalid lvalue in assignment"))
3982 return error_mark_node;
3984 /* Warn about storing in something that is `const'. */
3986 if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
3987 || ((TREE_CODE (lhstype) == RECORD_TYPE
3988 || TREE_CODE (lhstype) == UNION_TYPE)
3989 && C_TYPE_FIELDS_READONLY (lhstype)))
3990 readonly_warning (lhs, "assignment");
3992 /* If storing into a structure or union member,
3993 it has probably been given type `int'.
3994 Compute the type that would go with
3995 the actual amount of storage the member occupies. */
3997 if (TREE_CODE (lhs) == COMPONENT_REF
3998 && (TREE_CODE (lhstype) == INTEGER_TYPE
3999 || TREE_CODE (lhstype) == BOOLEAN_TYPE
4000 || TREE_CODE (lhstype) == REAL_TYPE
4001 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
4002 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
4004 /* If storing in a field that is in actuality a short or narrower than one,
4005 we must store in the field in its actual type. */
4007 if (lhstype != TREE_TYPE (lhs))
4009 lhs = copy_node (lhs);
4010 TREE_TYPE (lhs) = lhstype;
4013 /* Convert new value to destination type. */
4015 newrhs = convert_for_assignment (lhstype, newrhs, _("assignment"),
4016 NULL_TREE, NULL_TREE, 0);
4017 if (TREE_CODE (newrhs) == ERROR_MARK)
4018 return error_mark_node;
4022 result = build (MODIFY_EXPR, lhstype, lhs, newrhs);
4023 TREE_SIDE_EFFECTS (result) = 1;
4025 /* If we got the LHS in a different type for storing in,
4026 convert the result back to the nominal type of LHS
4027 so that the value we return always has the same type
4028 as the LHS argument. */
4030 if (olhstype == TREE_TYPE (result))
4032 return convert_for_assignment (olhstype, result, _("assignment"),
4033 NULL_TREE, NULL_TREE, 0);
4036 /* Convert value RHS to type TYPE as preparation for an assignment
4037 to an lvalue of type TYPE.
4038 The real work of conversion is done by `convert'.
4039 The purpose of this function is to generate error messages
4040 for assignments that are not allowed in C.
4041 ERRTYPE is a string to use in error messages:
4042 "assignment", "return", etc. If it is null, this is parameter passing
4043 for a function call (and different error messages are output).
4045 FUNNAME is the name of the function being called,
4046 as an IDENTIFIER_NODE, or null.
4047 PARMNUM is the number of the argument, for printing in error messages. */
4050 convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum)
4052 const char *errtype;
4053 tree fundecl, funname;
4056 register enum tree_code codel = TREE_CODE (type);
4057 register tree rhstype;
4058 register enum tree_code coder;
4060 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4061 /* Do not use STRIP_NOPS here. We do not want an enumerator
4062 whose value is 0 to count as a null pointer constant. */
4063 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
4064 rhs = TREE_OPERAND (rhs, 0);
4066 if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
4067 || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE)
4068 rhs = default_conversion (rhs);
4069 else if (optimize && TREE_CODE (rhs) == VAR_DECL)
4070 rhs = decl_constant_value_for_broken_optimization (rhs);
4072 rhstype = TREE_TYPE (rhs);
4073 coder = TREE_CODE (rhstype);
4075 if (coder == ERROR_MARK)
4076 return error_mark_node;
4078 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
4080 overflow_warning (rhs);
4081 /* Check for Objective-C protocols. This will issue a warning if
4082 there are protocol violations. No need to use the return value. */
4083 maybe_objc_comptypes (type, rhstype, 0);
4087 if (coder == VOID_TYPE)
4089 error ("void value not ignored as it ought to be");
4090 return error_mark_node;
4092 /* A type converts to a reference to it.
4093 This code doesn't fully support references, it's just for the
4094 special case of va_start and va_copy. */
4095 if (codel == REFERENCE_TYPE
4096 && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1)
4098 if (mark_addressable (rhs) == 0)
4099 return error_mark_node;
4100 rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs);
4102 /* We already know that these two types are compatible, but they
4103 may not be exactly identical. In fact, `TREE_TYPE (type)' is
4104 likely to be __builtin_va_list and `TREE_TYPE (rhs)' is
4105 likely to be va_list, a typedef to __builtin_va_list, which
4106 is different enough that it will cause problems later. */
4107 if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type))
4108 rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs);
4110 rhs = build1 (NOP_EXPR, type, rhs);
4113 /* Arithmetic types all interconvert, and enum is treated like int. */
4114 else if ((codel == INTEGER_TYPE || codel == REAL_TYPE
4115 || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE
4116 || codel == BOOLEAN_TYPE)
4117 && (coder == INTEGER_TYPE || coder == REAL_TYPE
4118 || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE
4119 || coder == BOOLEAN_TYPE))
4120 return convert_and_check (type, rhs);
4122 /* Conversion to a transparent union from its member types.
4123 This applies only to function arguments. */
4124 else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype)
4127 tree marginal_memb_type = 0;
4129 for (memb_types = TYPE_FIELDS (type); memb_types;
4130 memb_types = TREE_CHAIN (memb_types))
4132 tree memb_type = TREE_TYPE (memb_types);
4134 if (comptypes (TYPE_MAIN_VARIANT (memb_type),
4135 TYPE_MAIN_VARIANT (rhstype)))
4138 if (TREE_CODE (memb_type) != POINTER_TYPE)
4141 if (coder == POINTER_TYPE)
4143 register tree ttl = TREE_TYPE (memb_type);
4144 register tree ttr = TREE_TYPE (rhstype);
4146 /* Any non-function converts to a [const][volatile] void *
4147 and vice versa; otherwise, targets must be the same.
4148 Meanwhile, the lhs target must have all the qualifiers of
4150 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4151 || comp_target_types (memb_type, rhstype))
4153 /* If this type won't generate any warnings, use it. */
4154 if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr)
4155 || ((TREE_CODE (ttr) == FUNCTION_TYPE
4156 && TREE_CODE (ttl) == FUNCTION_TYPE)
4157 ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
4158 == TYPE_QUALS (ttr))
4159 : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr))
4160 == TYPE_QUALS (ttl))))
4163 /* Keep looking for a better type, but remember this one. */
4164 if (! marginal_memb_type)
4165 marginal_memb_type = memb_type;
4169 /* Can convert integer zero to any pointer type. */
4170 if (integer_zerop (rhs)
4171 || (TREE_CODE (rhs) == NOP_EXPR
4172 && integer_zerop (TREE_OPERAND (rhs, 0))))
4174 rhs = null_pointer_node;
4179 if (memb_types || marginal_memb_type)
4183 /* We have only a marginally acceptable member type;
4184 it needs a warning. */
4185 register tree ttl = TREE_TYPE (marginal_memb_type);
4186 register tree ttr = TREE_TYPE (rhstype);
4188 /* Const and volatile mean something different for function
4189 types, so the usual warnings are not appropriate. */
4190 if (TREE_CODE (ttr) == FUNCTION_TYPE
4191 && TREE_CODE (ttl) == FUNCTION_TYPE)
4193 /* Because const and volatile on functions are
4194 restrictions that say the function will not do
4195 certain things, it is okay to use a const or volatile
4196 function where an ordinary one is wanted, but not
4198 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
4199 warn_for_assignment ("%s makes qualified function pointer from unqualified",
4200 errtype, funname, parmnum);
4202 else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
4203 warn_for_assignment ("%s discards qualifiers from pointer target type",
4208 if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl))
4209 pedwarn ("ISO C prohibits argument conversion to union type");
4211 return build1 (NOP_EXPR, type, rhs);
4215 /* Conversions among pointers */
4216 else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE)
4217 && (coder == POINTER_TYPE || coder == REFERENCE_TYPE))
4219 register tree ttl = TREE_TYPE (type);
4220 register tree ttr = TREE_TYPE (rhstype);
4222 /* Any non-function converts to a [const][volatile] void *
4223 and vice versa; otherwise, targets must be the same.
4224 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
4225 if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4226 || comp_target_types (type, rhstype)
4227 || (unsigned_type (TYPE_MAIN_VARIANT (ttl))
4228 == unsigned_type (TYPE_MAIN_VARIANT (ttr))))
4231 && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE)
4234 /* Check TREE_CODE to catch cases like (void *) (char *) 0
4235 which are not ANSI null ptr constants. */
4236 && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR)
4237 && TREE_CODE (ttl) == FUNCTION_TYPE)))
4238 warn_for_assignment ("ISO C forbids %s between function pointer and `void *'",
4239 errtype, funname, parmnum);
4240 /* Const and volatile mean something different for function types,
4241 so the usual warnings are not appropriate. */
4242 else if (TREE_CODE (ttr) != FUNCTION_TYPE
4243 && TREE_CODE (ttl) != FUNCTION_TYPE)
4245 if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl))
4246 warn_for_assignment ("%s discards qualifiers from pointer target type",
4247 errtype, funname, parmnum);
4248 /* If this is not a case of ignoring a mismatch in signedness,
4250 else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr)
4251 || comp_target_types (type, rhstype))
4253 /* If there is a mismatch, do warn. */
4255 warn_for_assignment ("pointer targets in %s differ in signedness",
4256 errtype, funname, parmnum);
4258 else if (TREE_CODE (ttl) == FUNCTION_TYPE
4259 && TREE_CODE (ttr) == FUNCTION_TYPE)
4261 /* Because const and volatile on functions are restrictions
4262 that say the function will not do certain things,
4263 it is okay to use a const or volatile function
4264 where an ordinary one is wanted, but not vice-versa. */
4265 if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr))
4266 warn_for_assignment ("%s makes qualified function pointer from unqualified",
4267 errtype, funname, parmnum);
4271 warn_for_assignment ("%s from incompatible pointer type",
4272 errtype, funname, parmnum);
4273 return convert (type, rhs);
4275 else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
4277 /* An explicit constant 0 can convert to a pointer,
4278 or one that results from arithmetic, even including
4279 a cast to integer type. */
4280 if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))
4282 ! (TREE_CODE (rhs) == NOP_EXPR
4283 && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
4284 && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST
4285 && integer_zerop (TREE_OPERAND (rhs, 0))))
4287 warn_for_assignment ("%s makes pointer from integer without a cast",
4288 errtype, funname, parmnum);
4289 return convert (type, rhs);
4291 return null_pointer_node;
4293 else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
4295 warn_for_assignment ("%s makes integer from pointer without a cast",
4296 errtype, funname, parmnum);
4297 return convert (type, rhs);
4299 else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE)
4300 return convert (type, rhs);
4306 tree selector = maybe_building_objc_message_expr ();
4308 if (selector && parmnum > 2)
4309 error ("incompatible type for argument %d of `%s'",
4310 parmnum - 2, IDENTIFIER_POINTER (selector));
4312 error ("incompatible type for argument %d of `%s'",
4313 parmnum, IDENTIFIER_POINTER (funname));
4316 error ("incompatible type for argument %d of indirect function call",
4320 error ("incompatible types in %s", errtype);
4322 return error_mark_node;
4325 /* Print a warning using MSGID.
4326 It gets OPNAME as its one parameter.
4327 If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'".
4328 FUNCTION and ARGNUM are handled specially if we are building an
4329 Objective-C selector. */
4332 warn_for_assignment (msgid, opname, function, argnum)
4340 tree selector = maybe_building_objc_message_expr ();
4343 if (selector && argnum > 2)
4345 function = selector;
4350 /* Function name is known; supply it. */
4351 const char *argstring = _("passing arg %d of `%s'");
4352 new_opname = (char *) alloca (IDENTIFIER_LENGTH (function)
4353 + strlen (argstring) + 1 + 25
4355 sprintf (new_opname, argstring, argnum,
4356 IDENTIFIER_POINTER (function));
4360 /* Function name unknown (call through ptr); just give arg number.*/
4361 const char *argnofun = _("passing arg %d of pointer to function");
4362 new_opname = (char *) alloca (strlen (argnofun) + 1 + 25 /*%d*/ + 1);
4363 sprintf (new_opname, argnofun, argnum);
4365 opname = new_opname;
4367 pedwarn (msgid, opname);
4370 /* If VALUE is a compound expr all of whose expressions are constant, then
4371 return its value. Otherwise, return error_mark_node.
4373 This is for handling COMPOUND_EXPRs as initializer elements
4374 which is allowed with a warning when -pedantic is specified. */
4377 valid_compound_expr_initializer (value, endtype)
4381 if (TREE_CODE (value) == COMPOUND_EXPR)
4383 if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
4385 return error_mark_node;
4386 return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
4389 else if (! TREE_CONSTANT (value)
4390 && ! initializer_constant_valid_p (value, endtype))
4391 return error_mark_node;
4396 /* Perform appropriate conversions on the initial value of a variable,
4397 store it in the declaration DECL,
4398 and print any error messages that are appropriate.
4399 If the init is invalid, store an ERROR_MARK. */
4402 store_init_value (decl, init)
4405 register tree value, type;
4407 /* If variable's type was invalidly declared, just ignore it. */
4409 type = TREE_TYPE (decl);
4410 if (TREE_CODE (type) == ERROR_MARK)
4413 /* Digest the specified initializer into an expression. */
4415 value = digest_init (type, init, TREE_STATIC (decl),
4416 TREE_STATIC (decl) || (pedantic && !flag_isoc99));
4418 /* Store the expression if valid; else report error. */
4421 /* Note that this is the only place we can detect the error
4422 in a case such as struct foo bar = (struct foo) { x, y };
4423 where there is one initial value which is a constructor expression. */
4424 if (value == error_mark_node)
4426 else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value))
4428 error ("initializer for static variable is not constant");
4429 value = error_mark_node;
4431 else if (TREE_STATIC (decl)
4432 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
4434 error ("initializer for static variable uses complicated arithmetic");
4435 value = error_mark_node;
4439 if (pedantic && TREE_CODE (value) == CONSTRUCTOR)
4441 if (! TREE_CONSTANT (value))
4442 pedwarn ("aggregate initializer is not constant");
4443 else if (! TREE_STATIC (value))
4444 pedwarn ("aggregate initializer uses complicated arithmetic");
4449 if (warn_traditional && !in_system_header
4450 && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && ! TREE_STATIC (decl))
4451 warning ("traditional C rejects automatic aggregate initialization");
4453 DECL_INITIAL (decl) = value;
4455 /* ANSI wants warnings about out-of-range constant initializers. */
4456 STRIP_TYPE_NOPS (value);
4457 constant_expression_warning (value);
4460 /* Methods for storing and printing names for error messages. */
4462 /* Implement a spelling stack that allows components of a name to be pushed
4463 and popped. Each element on the stack is this structure. */
4475 #define SPELLING_STRING 1
4476 #define SPELLING_MEMBER 2
4477 #define SPELLING_BOUNDS 3
4479 static struct spelling *spelling; /* Next stack element (unused). */
4480 static struct spelling *spelling_base; /* Spelling stack base. */
4481 static int spelling_size; /* Size of the spelling stack. */
4483 /* Macros to save and restore the spelling stack around push_... functions.
4484 Alternative to SAVE_SPELLING_STACK. */
4486 #define SPELLING_DEPTH() (spelling - spelling_base)
4487 #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth)
4489 /* Save and restore the spelling stack around arbitrary C code. */
4491 #define SAVE_SPELLING_DEPTH(code) \
4493 int __depth = SPELLING_DEPTH (); \
4495 RESTORE_SPELLING_DEPTH (__depth); \
4498 /* Push an element on the spelling stack with type KIND and assign VALUE
4501 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
4503 int depth = SPELLING_DEPTH (); \
4505 if (depth >= spelling_size) \
4507 spelling_size += 10; \
4508 if (spelling_base == 0) \
4510 = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \
4513 = (struct spelling *) xrealloc (spelling_base, \
4514 spelling_size * sizeof (struct spelling)); \
4515 RESTORE_SPELLING_DEPTH (depth); \
4518 spelling->kind = (KIND); \
4519 spelling->MEMBER = (VALUE); \
4523 /* Push STRING on the stack. Printed literally. */
4526 push_string (string)
4529 PUSH_SPELLING (SPELLING_STRING, string, u.s);
4532 /* Push a member name on the stack. Printed as '.' STRING. */
4535 push_member_name (decl)
4540 = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
4541 PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
4544 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
4547 push_array_bounds (bounds)
4550 PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
4553 /* Compute the maximum size in bytes of the printed spelling. */
4558 register int size = 0;
4559 register struct spelling *p;
4561 for (p = spelling_base; p < spelling; p++)
4563 if (p->kind == SPELLING_BOUNDS)
4566 size += strlen (p->u.s) + 1;
4572 /* Print the spelling to BUFFER and return it. */
4575 print_spelling (buffer)
4576 register char *buffer;
4578 register char *d = buffer;
4579 register struct spelling *p;
4581 for (p = spelling_base; p < spelling; p++)
4582 if (p->kind == SPELLING_BOUNDS)
4584 sprintf (d, "[%d]", p->u.i);
4589 register const char *s;
4590 if (p->kind == SPELLING_MEMBER)
4592 for (s = p->u.s; (*d = *s++); d++)
4599 /* Issue an error message for a bad initializer component.
4600 MSGID identifies the message.
4601 The component name is taken from the spelling stack. */
4609 error ("%s", msgid);
4610 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4612 error ("(near initialization for `%s')", ofwhat);
4615 /* Issue a pedantic warning for a bad initializer component.
4616 MSGID identifies the message.
4617 The component name is taken from the spelling stack. */
4620 pedwarn_init (msgid)
4625 pedwarn ("%s", msgid);
4626 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4628 pedwarn ("(near initialization for `%s')", ofwhat);
4631 /* Issue a warning for a bad initializer component.
4632 MSGID identifies the message.
4633 The component name is taken from the spelling stack. */
4636 warning_init (msgid)
4641 warning ("%s", msgid);
4642 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4644 warning ("(near initialization for `%s')", ofwhat);
4647 /* Digest the parser output INIT as an initializer for type TYPE.
4648 Return a C expression of type TYPE to represent the initial value.
4650 The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors
4651 if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT
4652 applies only to elements of constructors. */
4655 digest_init (type, init, require_constant, constructor_constant)
4657 int require_constant, constructor_constant;
4659 enum tree_code code = TREE_CODE (type);
4660 tree inside_init = init;
4662 if (type == error_mark_node
4663 || init == error_mark_node
4664 || TREE_TYPE (init) == error_mark_node)
4665 return error_mark_node;
4667 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4668 /* Do not use STRIP_NOPS here. We do not want an enumerator
4669 whose value is 0 to count as a null pointer constant. */
4670 if (TREE_CODE (init) == NON_LVALUE_EXPR)
4671 inside_init = TREE_OPERAND (init, 0);
4673 /* Initialization of an array of chars from a string constant
4674 optionally enclosed in braces. */
4676 if (code == ARRAY_TYPE)
4678 tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
4679 if ((typ1 == char_type_node
4680 || typ1 == signed_char_type_node
4681 || typ1 == unsigned_char_type_node
4682 || typ1 == unsigned_wchar_type_node
4683 || typ1 == signed_wchar_type_node)
4684 && ((inside_init && TREE_CODE (inside_init) == STRING_CST)))
4686 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4687 TYPE_MAIN_VARIANT (type)))
4690 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4692 && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node))
4694 error_init ("char-array initialized from wide string");
4695 return error_mark_node;
4697 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4699 && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node))
4701 error_init ("int-array initialized from non-wide string");
4702 return error_mark_node;
4705 TREE_TYPE (inside_init) = type;
4706 if (TYPE_DOMAIN (type) != 0
4707 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST
4708 /* Subtract 1 (or sizeof (wchar_t))
4709 because it's ok to ignore the terminating null char
4710 that is counted in the length of the constant. */
4711 && 0 > compare_tree_int (TYPE_SIZE_UNIT (type),
4712 TREE_STRING_LENGTH (inside_init)
4713 - ((TYPE_PRECISION (typ1)
4714 != TYPE_PRECISION (char_type_node))
4715 ? (TYPE_PRECISION (wchar_type_node)
4718 pedwarn_init ("initializer-string for array of chars is too long");
4724 /* Any type can be initialized
4725 from an expression of the same type, optionally with braces. */
4727 if (inside_init && TREE_TYPE (inside_init) != 0
4728 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4729 TYPE_MAIN_VARIANT (type))
4730 || (code == ARRAY_TYPE
4731 && comptypes (TREE_TYPE (inside_init), type))
4732 || (code == POINTER_TYPE
4733 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4734 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)
4735 && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
4736 TREE_TYPE (type)))))
4738 if (code == POINTER_TYPE
4739 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4740 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE))
4741 inside_init = default_conversion (inside_init);
4742 else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
4743 && TREE_CODE (inside_init) != CONSTRUCTOR)
4745 error_init ("array initialized from non-constant array expression");
4746 return error_mark_node;
4749 if (optimize && TREE_CODE (inside_init) == VAR_DECL)
4750 inside_init = decl_constant_value_for_broken_optimization (inside_init);
4752 /* Compound expressions can only occur here if -pedantic or
4753 -pedantic-errors is specified. In the later case, we always want
4754 an error. In the former case, we simply want a warning. */
4755 if (require_constant && pedantic
4756 && TREE_CODE (inside_init) == COMPOUND_EXPR)
4759 = valid_compound_expr_initializer (inside_init,
4760 TREE_TYPE (inside_init));
4761 if (inside_init == error_mark_node)
4762 error_init ("initializer element is not constant");
4764 pedwarn_init ("initializer element is not constant");
4765 if (flag_pedantic_errors)
4766 inside_init = error_mark_node;
4768 else if (require_constant && ! TREE_CONSTANT (inside_init))
4770 error_init ("initializer element is not constant");
4771 inside_init = error_mark_node;
4773 else if (require_constant
4774 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4775 pedwarn ("initializer element is not computable at load time");
4780 /* Handle scalar types, including conversions. */
4782 if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
4783 || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE)
4785 /* Note that convert_for_assignment calls default_conversion
4786 for arrays and functions. We must not call it in the
4787 case where inside_init is a null pointer constant. */
4789 = convert_for_assignment (type, init, _("initialization"),
4790 NULL_TREE, NULL_TREE, 0);
4792 if (require_constant && ! TREE_CONSTANT (inside_init))
4794 error_init ("initializer element is not constant");
4795 inside_init = error_mark_node;
4797 else if (require_constant
4798 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4800 error_init ("initializer element is not computable at load time");
4801 inside_init = error_mark_node;
4807 /* Come here only for records and arrays. */
4809 if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4811 error_init ("variable-sized object may not be initialized");
4812 return error_mark_node;
4815 /* Traditionally, you can write struct foo x = 0;
4816 and it initializes the first element of x to 0. */
4817 if (flag_traditional)
4819 tree top = 0, prev = 0, otype = type;
4820 while (TREE_CODE (type) == RECORD_TYPE
4821 || TREE_CODE (type) == ARRAY_TYPE
4822 || TREE_CODE (type) == QUAL_UNION_TYPE
4823 || TREE_CODE (type) == UNION_TYPE)
4825 tree temp = build (CONSTRUCTOR, type, NULL_TREE, NULL_TREE);
4829 TREE_OPERAND (prev, 1) = build_tree_list (NULL_TREE, temp);
4831 if (TREE_CODE (type) == ARRAY_TYPE)
4832 type = TREE_TYPE (type);
4833 else if (TYPE_FIELDS (type))
4834 type = TREE_TYPE (TYPE_FIELDS (type));
4837 error_init ("invalid initializer");
4838 return error_mark_node;
4844 TREE_OPERAND (prev, 1)
4845 = build_tree_list (NULL_TREE,
4846 digest_init (type, init, require_constant,
4847 constructor_constant));
4851 return error_mark_node;
4853 error_init ("invalid initializer");
4854 return error_mark_node;
4857 /* Handle initializers that use braces. */
4859 /* Type of object we are accumulating a constructor for.
4860 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
4861 static tree constructor_type;
4863 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
4865 static tree constructor_fields;
4867 /* For an ARRAY_TYPE, this is the specified index
4868 at which to store the next element we get. */
4869 static tree constructor_index;
4871 /* For an ARRAY_TYPE, this is the maximum index. */
4872 static tree constructor_max_index;
4874 /* For a RECORD_TYPE, this is the first field not yet written out. */
4875 static tree constructor_unfilled_fields;
4877 /* For an ARRAY_TYPE, this is the index of the first element
4878 not yet written out. */
4879 static tree constructor_unfilled_index;
4881 /* In a RECORD_TYPE, the byte index of the next consecutive field.
4882 This is so we can generate gaps between fields, when appropriate. */
4883 static tree constructor_bit_index;
4885 /* If we are saving up the elements rather than allocating them,
4886 this is the list of elements so far (in reverse order,
4887 most recent first). */
4888 static tree constructor_elements;
4890 /* 1 if constructor should be incrementally stored into a constructor chain,
4891 0 if all the elements should be kept in AVL tree. */
4892 static int constructor_incremental;
4894 /* 1 if so far this constructor's elements are all compile-time constants. */
4895 static int constructor_constant;
4897 /* 1 if so far this constructor's elements are all valid address constants. */
4898 static int constructor_simple;
4900 /* 1 if this constructor is erroneous so far. */
4901 static int constructor_erroneous;
4903 /* 1 if have called defer_addressed_constants. */
4904 static int constructor_subconstants_deferred;
4906 /* Structure for managing pending initializer elements, organized as an
4911 struct init_node *left, *right;
4912 struct init_node *parent;
4918 /* Tree of pending elements at this constructor level.
4919 These are elements encountered out of order
4920 which belong at places we haven't reached yet in actually
4922 Will never hold tree nodes across GC runs. */
4923 static struct init_node *constructor_pending_elts;
4925 /* The SPELLING_DEPTH of this constructor. */
4926 static int constructor_depth;
4928 /* 0 if implicitly pushing constructor levels is allowed. */
4929 int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */
4931 static int require_constant_value;
4932 static int require_constant_elements;
4934 /* DECL node for which an initializer is being read.
4935 0 means we are reading a constructor expression
4936 such as (struct foo) {...}. */
4937 static tree constructor_decl;
4939 /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */
4940 static const char *constructor_asmspec;
4942 /* Nonzero if this is an initializer for a top-level decl. */
4943 static int constructor_top_level;
4945 /* Nesting depth of designator list. */
4946 static int designator_depth;
4948 /* Nonzero if there were diagnosed errors in this designator list. */
4949 static int designator_errorneous;
4952 /* This stack has a level for each implicit or explicit level of
4953 structuring in the initializer, including the outermost one. It
4954 saves the values of most of the variables above. */
4956 struct constructor_range_stack;
4958 struct constructor_stack
4960 struct constructor_stack *next;
4965 tree unfilled_index;
4966 tree unfilled_fields;
4969 struct init_node *pending_elts;
4972 /* If nonzero, this value should replace the entire
4973 constructor at this level. */
4974 tree replacement_value;
4975 struct constructor_range_stack *range_stack;
4984 struct constructor_stack *constructor_stack;
4986 /* This stack represents designators from some range designator up to
4987 the last designator in the list. */
4989 struct constructor_range_stack
4991 struct constructor_range_stack *next, *prev;
4992 struct constructor_stack *stack;
4999 struct constructor_range_stack *constructor_range_stack;
5001 /* This stack records separate initializers that are nested.
5002 Nested initializers can't happen in ANSI C, but GNU C allows them
5003 in cases like { ... (struct foo) { ... } ... }. */
5005 struct initializer_stack
5007 struct initializer_stack *next;
5009 const char *asmspec;
5010 struct constructor_stack *constructor_stack;
5011 struct constructor_range_stack *constructor_range_stack;
5013 struct spelling *spelling;
5014 struct spelling *spelling_base;
5017 char require_constant_value;
5018 char require_constant_elements;
5022 struct initializer_stack *initializer_stack;
5024 /* Prepare to parse and output the initializer for variable DECL. */
5027 start_init (decl, asmspec_tree, top_level)
5033 struct initializer_stack *p
5034 = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack));
5035 const char *asmspec = 0;
5038 asmspec = TREE_STRING_POINTER (asmspec_tree);
5040 p->decl = constructor_decl;
5041 p->asmspec = constructor_asmspec;
5042 p->require_constant_value = require_constant_value;
5043 p->require_constant_elements = require_constant_elements;
5044 p->constructor_stack = constructor_stack;
5045 p->constructor_range_stack = constructor_range_stack;
5046 p->elements = constructor_elements;
5047 p->spelling = spelling;
5048 p->spelling_base = spelling_base;
5049 p->spelling_size = spelling_size;
5050 p->deferred = constructor_subconstants_deferred;
5051 p->top_level = constructor_top_level;
5052 p->next = initializer_stack;
5053 initializer_stack = p;
5055 constructor_decl = decl;
5056 constructor_asmspec = asmspec;
5057 constructor_subconstants_deferred = 0;
5058 constructor_top_level = top_level;
5062 require_constant_value = TREE_STATIC (decl);
5063 require_constant_elements
5064 = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99))
5065 /* For a scalar, you can always use any value to initialize,
5066 even within braces. */
5067 && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
5068 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5069 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
5070 || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
5071 locus = IDENTIFIER_POINTER (DECL_NAME (decl));
5075 require_constant_value = 0;
5076 require_constant_elements = 0;
5077 locus = "(anonymous)";
5080 constructor_stack = 0;
5081 constructor_range_stack = 0;
5083 missing_braces_mentioned = 0;
5087 RESTORE_SPELLING_DEPTH (0);
5090 push_string (locus);
5096 struct initializer_stack *p = initializer_stack;
5098 /* Output subconstants (string constants, usually)
5099 that were referenced within this initializer and saved up.
5100 Must do this if and only if we called defer_addressed_constants. */
5101 if (constructor_subconstants_deferred)
5102 output_deferred_addressed_constants ();
5104 /* Free the whole constructor stack of this initializer. */
5105 while (constructor_stack)
5107 struct constructor_stack *q = constructor_stack;
5108 constructor_stack = q->next;
5112 if (constructor_range_stack)
5115 /* Pop back to the data of the outer initializer (if any). */
5116 constructor_decl = p->decl;
5117 constructor_asmspec = p->asmspec;
5118 require_constant_value = p->require_constant_value;
5119 require_constant_elements = p->require_constant_elements;
5120 constructor_stack = p->constructor_stack;
5121 constructor_range_stack = p->constructor_range_stack;
5122 constructor_elements = p->elements;
5123 spelling = p->spelling;
5124 spelling_base = p->spelling_base;
5125 spelling_size = p->spelling_size;
5126 constructor_subconstants_deferred = p->deferred;
5127 constructor_top_level = p->top_level;
5128 initializer_stack = p->next;
5132 /* Call here when we see the initializer is surrounded by braces.
5133 This is instead of a call to push_init_level;
5134 it is matched by a call to pop_init_level.
5136 TYPE is the type to initialize, for a constructor expression.
5137 For an initializer for a decl, TYPE is zero. */
5140 really_start_incremental_init (type)
5143 struct constructor_stack *p
5144 = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5147 type = TREE_TYPE (constructor_decl);
5149 p->type = constructor_type;
5150 p->fields = constructor_fields;
5151 p->index = constructor_index;
5152 p->max_index = constructor_max_index;
5153 p->unfilled_index = constructor_unfilled_index;
5154 p->unfilled_fields = constructor_unfilled_fields;
5155 p->bit_index = constructor_bit_index;
5156 p->elements = constructor_elements;
5157 p->constant = constructor_constant;
5158 p->simple = constructor_simple;
5159 p->erroneous = constructor_erroneous;
5160 p->pending_elts = constructor_pending_elts;
5161 p->depth = constructor_depth;
5162 p->replacement_value = 0;
5166 p->incremental = constructor_incremental;
5168 constructor_stack = p;
5170 constructor_constant = 1;
5171 constructor_simple = 1;
5172 constructor_depth = SPELLING_DEPTH ();
5173 constructor_elements = 0;
5174 constructor_pending_elts = 0;
5175 constructor_type = type;
5176 constructor_incremental = 1;
5177 designator_depth = 0;
5178 designator_errorneous = 0;
5180 if (TREE_CODE (constructor_type) == RECORD_TYPE
5181 || TREE_CODE (constructor_type) == UNION_TYPE)
5183 constructor_fields = TYPE_FIELDS (constructor_type);
5184 /* Skip any nameless bit fields at the beginning. */
5185 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5186 && DECL_NAME (constructor_fields) == 0)
5187 constructor_fields = TREE_CHAIN (constructor_fields);
5189 constructor_unfilled_fields = constructor_fields;
5190 constructor_bit_index = bitsize_zero_node;
5192 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5194 if (TYPE_DOMAIN (constructor_type))
5196 constructor_max_index
5197 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5199 /* Detect non-empty initializations of zero-length arrays. */
5200 if (constructor_max_index == NULL_TREE)
5201 constructor_max_index = build_int_2 (-1, -1);
5204 = convert (bitsizetype,
5205 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5208 constructor_index = bitsize_zero_node;
5210 constructor_unfilled_index = constructor_index;
5214 /* Handle the case of int x = {5}; */
5215 constructor_fields = constructor_type;
5216 constructor_unfilled_fields = constructor_type;
5220 /* Push down into a subobject, for initialization.
5221 If this is for an explicit set of braces, IMPLICIT is 0.
5222 If it is because the next element belongs at a lower level,
5223 IMPLICIT is 1 (or 2 if the push is because of designator list). */
5226 push_init_level (implicit)
5229 struct constructor_stack *p;
5230 tree value = NULL_TREE;
5232 /* If we've exhausted any levels that didn't have braces,
5234 while (constructor_stack->implicit)
5236 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5237 || TREE_CODE (constructor_type) == UNION_TYPE)
5238 && constructor_fields == 0)
5239 process_init_element (pop_init_level (1));
5240 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
5241 && tree_int_cst_lt (constructor_max_index, constructor_index))
5242 process_init_element (pop_init_level (1));
5247 /* Unless this is an explicit brace, we need to preserve previous
5251 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5252 || TREE_CODE (constructor_type) == UNION_TYPE)
5253 && constructor_fields)
5254 value = find_init_member (constructor_fields);
5255 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5256 value = find_init_member (constructor_index);
5259 p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5260 p->type = constructor_type;
5261 p->fields = constructor_fields;
5262 p->index = constructor_index;
5263 p->max_index = constructor_max_index;
5264 p->unfilled_index = constructor_unfilled_index;
5265 p->unfilled_fields = constructor_unfilled_fields;
5266 p->bit_index = constructor_bit_index;
5267 p->elements = constructor_elements;
5268 p->constant = constructor_constant;
5269 p->simple = constructor_simple;
5270 p->erroneous = constructor_erroneous;
5271 p->pending_elts = constructor_pending_elts;
5272 p->depth = constructor_depth;
5273 p->replacement_value = 0;
5274 p->implicit = implicit;
5276 p->incremental = constructor_incremental;
5277 p->next = constructor_stack;
5279 constructor_stack = p;
5281 constructor_constant = 1;
5282 constructor_simple = 1;
5283 constructor_depth = SPELLING_DEPTH ();
5284 constructor_elements = 0;
5285 constructor_incremental = 1;
5286 constructor_pending_elts = 0;
5289 p->range_stack = constructor_range_stack;
5290 constructor_range_stack = 0;
5291 designator_depth = 0;
5292 designator_errorneous = 0;
5295 /* Don't die if an entire brace-pair level is superfluous
5296 in the containing level. */
5297 if (constructor_type == 0)
5299 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5300 || TREE_CODE (constructor_type) == UNION_TYPE)
5302 /* Don't die if there are extra init elts at the end. */
5303 if (constructor_fields == 0)
5304 constructor_type = 0;
5307 constructor_type = TREE_TYPE (constructor_fields);
5308 push_member_name (constructor_fields);
5309 constructor_depth++;
5312 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5314 constructor_type = TREE_TYPE (constructor_type);
5315 push_array_bounds (tree_low_cst (constructor_index, 0));
5316 constructor_depth++;
5319 if (constructor_type == 0)
5321 error_init ("extra brace group at end of initializer");
5322 constructor_fields = 0;
5323 constructor_unfilled_fields = 0;
5327 if (value && TREE_CODE (value) == CONSTRUCTOR)
5329 constructor_constant = TREE_CONSTANT (value);
5330 constructor_simple = TREE_STATIC (value);
5331 constructor_elements = TREE_OPERAND (value, 1);
5332 if (constructor_elements
5333 && (TREE_CODE (constructor_type) == RECORD_TYPE
5334 || TREE_CODE (constructor_type) == ARRAY_TYPE))
5335 set_nonincremental_init ();
5338 if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned)
5340 missing_braces_mentioned = 1;
5341 warning_init ("missing braces around initializer");
5344 if (TREE_CODE (constructor_type) == RECORD_TYPE
5345 || TREE_CODE (constructor_type) == UNION_TYPE)
5347 constructor_fields = TYPE_FIELDS (constructor_type);
5348 /* Skip any nameless bit fields at the beginning. */
5349 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5350 && DECL_NAME (constructor_fields) == 0)
5351 constructor_fields = TREE_CHAIN (constructor_fields);
5353 constructor_unfilled_fields = constructor_fields;
5354 constructor_bit_index = bitsize_zero_node;
5356 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5358 if (TYPE_DOMAIN (constructor_type))
5360 constructor_max_index
5361 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5363 = convert (bitsizetype,
5364 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5366 /* ??? For GCC 3.1, remove special case initialization of
5367 zero-length array members from pop_init_level and set
5368 constructor_max_index such that we get the normal
5369 "excess elements" warning. */
5372 constructor_index = bitsize_zero_node;
5374 constructor_unfilled_index = constructor_index;
5375 if (value && TREE_CODE (value) == STRING_CST)
5377 /* We need to split the char/wchar array into individual
5378 characters, so that we don't have to special case it
5380 set_nonincremental_init_from_string (value);
5385 warning_init ("braces around scalar initializer");
5386 constructor_fields = constructor_type;
5387 constructor_unfilled_fields = constructor_type;
5391 /* At the end of an implicit or explicit brace level,
5392 finish up that level of constructor.
5393 If we were outputting the elements as they are read, return 0
5394 from inner levels (process_init_element ignores that),
5395 but return error_mark_node from the outermost level
5396 (that's what we want to put in DECL_INITIAL).
5397 Otherwise, return a CONSTRUCTOR expression. */
5400 pop_init_level (implicit)
5403 struct constructor_stack *p;
5404 HOST_WIDE_INT size = 0;
5405 tree constructor = 0;
5409 /* When we come to an explicit close brace,
5410 pop any inner levels that didn't have explicit braces. */
5411 while (constructor_stack->implicit)
5412 process_init_element (pop_init_level (1));
5414 if (constructor_range_stack)
5418 p = constructor_stack;
5420 if (constructor_type != 0)
5421 size = int_size_in_bytes (constructor_type);
5423 /* Error for initializing a flexible array member, or a zero-length
5424 array member in an inappropriate context. */
5425 if (constructor_type && constructor_fields
5426 && TREE_CODE (constructor_type) == ARRAY_TYPE
5427 && TYPE_DOMAIN (constructor_type)
5428 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
5430 /* Silently discard empty initializations. The parser will
5431 already have pedwarned for empty brackets. */
5432 if (integer_zerop (constructor_unfilled_index))
5433 constructor_type = NULL_TREE;
5434 else if (! TYPE_SIZE (constructor_type))
5436 if (constructor_depth > 2)
5437 error_init ("initialization of flexible array member in a nested context");
5439 pedwarn_init ("initialization of a flexible array member");
5441 /* We have already issued an error message for the existance
5442 of a flexible array member not at the end of the structure.
5443 Discard the initializer so that we do not abort later. */
5444 if (TREE_CHAIN (constructor_fields) != NULL_TREE)
5445 constructor_type = NULL_TREE;
5449 warning_init ("deprecated initialization of zero-length array");
5451 /* We must be initializing the last member of a top-level struct. */
5452 if (TREE_CHAIN (constructor_fields) != NULL_TREE)
5454 error_init ("initialization of zero-length array before end of structure");
5455 /* Discard the initializer so that we do not abort later. */
5456 constructor_type = NULL_TREE;
5458 else if (constructor_depth > 2)
5459 error_init ("initialization of zero-length array inside a nested context");
5463 /* Warn when some struct elements are implicitly initialized to zero. */
5466 && TREE_CODE (constructor_type) == RECORD_TYPE
5467 && constructor_unfilled_fields)
5469 /* Do not warn for flexible array members or zero-length arrays. */
5470 while (constructor_unfilled_fields
5471 && (! DECL_SIZE (constructor_unfilled_fields)
5472 || integer_zerop (DECL_SIZE (constructor_unfilled_fields))))
5473 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
5475 if (constructor_unfilled_fields)
5477 push_member_name (constructor_unfilled_fields);
5478 warning_init ("missing initializer");
5479 RESTORE_SPELLING_DEPTH (constructor_depth);
5483 /* Now output all pending elements. */
5484 constructor_incremental = 1;
5485 output_pending_init_elements (1);
5487 /* Pad out the end of the structure. */
5488 if (p->replacement_value)
5489 /* If this closes a superfluous brace pair,
5490 just pass out the element between them. */
5491 constructor = p->replacement_value;
5492 else if (constructor_type == 0)
5494 else if (TREE_CODE (constructor_type) != RECORD_TYPE
5495 && TREE_CODE (constructor_type) != UNION_TYPE
5496 && TREE_CODE (constructor_type) != ARRAY_TYPE)
5498 /* A nonincremental scalar initializer--just return
5499 the element, after verifying there is just one. */
5500 if (constructor_elements == 0)
5502 if (!constructor_erroneous)
5503 error_init ("empty scalar initializer");
5504 constructor = error_mark_node;
5506 else if (TREE_CHAIN (constructor_elements) != 0)
5508 error_init ("extra elements in scalar initializer");
5509 constructor = TREE_VALUE (constructor_elements);
5512 constructor = TREE_VALUE (constructor_elements);
5516 if (constructor_erroneous)
5517 constructor = error_mark_node;
5520 constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE,
5521 nreverse (constructor_elements));
5522 if (constructor_constant)
5523 TREE_CONSTANT (constructor) = 1;
5524 if (constructor_constant && constructor_simple)
5525 TREE_STATIC (constructor) = 1;
5529 constructor_type = p->type;
5530 constructor_fields = p->fields;
5531 constructor_index = p->index;
5532 constructor_max_index = p->max_index;
5533 constructor_unfilled_index = p->unfilled_index;
5534 constructor_unfilled_fields = p->unfilled_fields;
5535 constructor_bit_index = p->bit_index;
5536 constructor_elements = p->elements;
5537 constructor_constant = p->constant;
5538 constructor_simple = p->simple;
5539 constructor_erroneous = p->erroneous;
5540 constructor_incremental = p->incremental;
5541 constructor_pending_elts = p->pending_elts;
5542 constructor_depth = p->depth;
5544 constructor_range_stack = p->range_stack;
5545 RESTORE_SPELLING_DEPTH (constructor_depth);
5547 constructor_stack = p->next;
5550 if (constructor == 0)
5552 if (constructor_stack == 0)
5553 return error_mark_node;
5559 /* Common handling for both array range and field name designators.
5560 ARRAY argument is non-zero for array ranges. Returns zero for success. */
5563 set_designator (array)
5567 enum tree_code subcode;
5569 /* Don't die if an entire brace-pair level is superfluous
5570 in the containing level. */
5571 if (constructor_type == 0)
5574 /* If there were errors in this designator list already, bail out silently. */
5575 if (designator_errorneous)
5578 if (!designator_depth)
5580 if (constructor_range_stack)
5583 /* Designator list starts at the level of closest explicit
5585 while (constructor_stack->implicit)
5586 process_init_element (pop_init_level (1));
5590 if (constructor_no_implicit)
5592 error_init ("initialization designators may not nest");
5596 if (TREE_CODE (constructor_type) == RECORD_TYPE
5597 || TREE_CODE (constructor_type) == UNION_TYPE)
5599 subtype = TREE_TYPE (constructor_fields);
5600 if (subtype != error_mark_node)
5601 subtype = TYPE_MAIN_VARIANT (subtype);
5603 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5605 subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
5610 subcode = TREE_CODE (subtype);
5611 if (array && subcode != ARRAY_TYPE)
5613 error_init ("array index in non-array initializer");
5616 else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE)
5618 error_init ("field name not in record or union initializer");
5622 push_init_level (2);
5626 /* If there are range designators in designator list, push a new designator
5627 to constructor_range_stack. RANGE_END is end of such stack range or
5628 NULL_TREE if there is no range designator at this level. */
5631 push_range_stack (range_end)
5634 struct constructor_range_stack *p;
5636 p = (struct constructor_range_stack *)
5637 ggc_alloc (sizeof (struct constructor_range_stack));
5638 p->prev = constructor_range_stack;
5640 p->fields = constructor_fields;
5641 p->range_start = constructor_index;
5642 p->index = constructor_index;
5643 p->stack = constructor_stack;
5644 p->range_end = range_end;
5645 if (constructor_range_stack)
5646 constructor_range_stack->next = p;
5647 constructor_range_stack = p;
5650 /* Within an array initializer, specify the next index to be initialized.
5651 FIRST is that index. If LAST is nonzero, then initialize a range
5652 of indices, running from FIRST through LAST. */
5655 set_init_index (first, last)
5658 if (set_designator (1))
5661 designator_errorneous = 1;
5663 while ((TREE_CODE (first) == NOP_EXPR
5664 || TREE_CODE (first) == CONVERT_EXPR
5665 || TREE_CODE (first) == NON_LVALUE_EXPR)
5666 && (TYPE_MODE (TREE_TYPE (first))
5667 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0)))))
5668 first = TREE_OPERAND (first, 0);
5671 while ((TREE_CODE (last) == NOP_EXPR
5672 || TREE_CODE (last) == CONVERT_EXPR
5673 || TREE_CODE (last) == NON_LVALUE_EXPR)
5674 && (TYPE_MODE (TREE_TYPE (last))
5675 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0)))))
5676 last = TREE_OPERAND (last, 0);
5678 if (TREE_CODE (first) != INTEGER_CST)
5679 error_init ("nonconstant array index in initializer");
5680 else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
5681 error_init ("nonconstant array index in initializer");
5682 else if (TREE_CODE (constructor_type) != ARRAY_TYPE)
5683 error_init ("array index in non-array initializer");
5684 else if (constructor_max_index
5685 && tree_int_cst_lt (constructor_max_index, first))
5686 error_init ("array index in initializer exceeds array bounds");
5689 constructor_index = convert (bitsizetype, first);
5693 if (tree_int_cst_equal (first, last))
5695 else if (tree_int_cst_lt (last, first))
5697 error_init ("empty index range in initializer");
5702 last = convert (bitsizetype, last);
5703 if (constructor_max_index != 0
5704 && tree_int_cst_lt (constructor_max_index, last))
5706 error_init ("array index range in initializer exceeds array bounds");
5713 designator_errorneous = 0;
5714 if (constructor_range_stack || last)
5715 push_range_stack (last);
5719 /* Within a struct initializer, specify the next field to be initialized. */
5722 set_init_label (fieldname)
5727 if (set_designator (0))
5730 designator_errorneous = 1;
5732 if (TREE_CODE (constructor_type) != RECORD_TYPE
5733 && TREE_CODE (constructor_type) != UNION_TYPE)
5735 error_init ("field name not in record or union initializer");
5739 for (tail = TYPE_FIELDS (constructor_type); tail;
5740 tail = TREE_CHAIN (tail))
5742 if (DECL_NAME (tail) == fieldname)
5747 error ("unknown field `%s' specified in initializer",
5748 IDENTIFIER_POINTER (fieldname));
5751 constructor_fields = tail;
5753 designator_errorneous = 0;
5754 if (constructor_range_stack)
5755 push_range_stack (NULL_TREE);
5759 /* Add a new initializer to the tree of pending initializers. PURPOSE
5760 indentifies the initializer, either array index or field in a structure.
5761 VALUE is the value of that index or field. */
5764 add_pending_init (purpose, value)
5765 tree purpose, value;
5767 struct init_node *p, **q, *r;
5769 q = &constructor_pending_elts;
5772 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5777 if (tree_int_cst_lt (purpose, p->purpose))
5779 else if (tree_int_cst_lt (p->purpose, purpose))
5783 if (TREE_SIDE_EFFECTS (p->value))
5784 warning_init ("initialized field with side-effects overwritten");
5794 bitpos = bit_position (purpose);
5798 if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
5800 else if (p->purpose != purpose)
5804 if (TREE_SIDE_EFFECTS (p->value))
5805 warning_init ("initialized field with side-effects overwritten");
5812 r = (struct init_node *) ggc_alloc (sizeof (struct init_node));
5813 r->purpose = purpose;
5824 struct init_node *s;
5828 if (p->balance == 0)
5830 else if (p->balance < 0)
5837 p->left->parent = p;
5854 constructor_pending_elts = r;
5859 struct init_node *t = r->right;
5863 r->right->parent = r;
5868 p->left->parent = p;
5871 p->balance = t->balance < 0;
5872 r->balance = -(t->balance > 0);
5887 constructor_pending_elts = t;
5893 /* p->balance == +1; growth of left side balances the node. */
5898 else /* r == p->right */
5900 if (p->balance == 0)
5901 /* Growth propagation from right side. */
5903 else if (p->balance > 0)
5910 p->right->parent = p;
5927 constructor_pending_elts = r;
5929 else /* r->balance == -1 */
5932 struct init_node *t = r->left;
5936 r->left->parent = r;
5941 p->right->parent = p;
5944 r->balance = (t->balance < 0);
5945 p->balance = -(t->balance > 0);
5960 constructor_pending_elts = t;
5966 /* p->balance == -1; growth of right side balances the node. */
5977 /* Build AVL tree from a sorted chain. */
5980 set_nonincremental_init ()
5984 if (TREE_CODE (constructor_type) != RECORD_TYPE
5985 && TREE_CODE (constructor_type) != ARRAY_TYPE)
5988 for (chain = constructor_elements; chain; chain = TREE_CHAIN (chain))
5989 add_pending_init (TREE_PURPOSE (chain), TREE_VALUE (chain));
5990 constructor_elements = 0;
5991 if (TREE_CODE (constructor_type) == RECORD_TYPE)
5993 constructor_unfilled_fields = TYPE_FIELDS (constructor_type);
5994 /* Skip any nameless bit fields at the beginning. */
5995 while (constructor_unfilled_fields != 0
5996 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
5997 && DECL_NAME (constructor_unfilled_fields) == 0)
5998 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
6001 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6003 if (TYPE_DOMAIN (constructor_type))
6004 constructor_unfilled_index
6005 = convert (bitsizetype,
6006 TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
6008 constructor_unfilled_index = bitsize_zero_node;
6010 constructor_incremental = 0;
6013 /* Build AVL tree from a string constant. */
6016 set_nonincremental_init_from_string (str)
6019 tree value, purpose, type;
6020 HOST_WIDE_INT val[2];
6021 const char *p, *end;
6022 int byte, wchar_bytes, charwidth, bitpos;
6024 if (TREE_CODE (constructor_type) != ARRAY_TYPE)
6027 if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
6028 == TYPE_PRECISION (char_type_node))
6030 else if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str)))
6031 == TYPE_PRECISION (wchar_type_node))
6032 wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
6036 charwidth = TYPE_PRECISION (char_type_node);
6037 type = TREE_TYPE (constructor_type);
6038 p = TREE_STRING_POINTER (str);
6039 end = p + TREE_STRING_LENGTH (str);
6041 for (purpose = bitsize_zero_node;
6042 p < end && !tree_int_cst_lt (constructor_max_index, purpose);
6043 purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node))
6045 if (wchar_bytes == 1)
6047 val[1] = (unsigned char) *p++;
6054 for (byte = 0; byte < wchar_bytes; byte++)
6056 if (BYTES_BIG_ENDIAN)
6057 bitpos = (wchar_bytes - byte - 1) * charwidth;
6059 bitpos = byte * charwidth;
6060 val[bitpos < HOST_BITS_PER_WIDE_INT]
6061 |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++))
6062 << (bitpos % HOST_BITS_PER_WIDE_INT);
6066 if (!TREE_UNSIGNED (type))
6068 bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR;
6069 if (bitpos < HOST_BITS_PER_WIDE_INT)
6071 if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1)))
6073 val[1] |= ((HOST_WIDE_INT) -1) << bitpos;
6077 else if (bitpos == HOST_BITS_PER_WIDE_INT)
6082 else if (val[0] & (((HOST_WIDE_INT) 1)
6083 << (bitpos - 1 - HOST_BITS_PER_WIDE_INT)))
6084 val[0] |= ((HOST_WIDE_INT) -1)
6085 << (bitpos - HOST_BITS_PER_WIDE_INT);
6088 value = build_int_2 (val[1], val[0]);
6089 TREE_TYPE (value) = type;
6090 add_pending_init (purpose, value);
6093 constructor_incremental = 0;
6096 /* Return value of FIELD in pending initializer or zero if the field was
6097 not initialized yet. */
6100 find_init_member (field)
6103 struct init_node *p;
6105 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6107 if (constructor_incremental
6108 && tree_int_cst_lt (field, constructor_unfilled_index))
6109 set_nonincremental_init ();
6111 p = constructor_pending_elts;
6114 if (tree_int_cst_lt (field, p->purpose))
6116 else if (tree_int_cst_lt (p->purpose, field))
6122 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6124 tree bitpos = bit_position (field);
6126 if (constructor_incremental
6127 && (!constructor_unfilled_fields
6128 || tree_int_cst_lt (bitpos,
6129 bit_position (constructor_unfilled_fields))))
6130 set_nonincremental_init ();
6132 p = constructor_pending_elts;
6135 if (field == p->purpose)
6137 else if (tree_int_cst_lt (bitpos, bit_position (p->purpose)))
6143 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6145 if (constructor_elements
6146 && TREE_PURPOSE (constructor_elements) == field)
6147 return TREE_VALUE (constructor_elements);
6152 /* "Output" the next constructor element.
6153 At top level, really output it to assembler code now.
6154 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
6155 TYPE is the data type that the containing data type wants here.
6156 FIELD is the field (a FIELD_DECL) or the index that this element fills.
6158 PENDING if non-nil means output pending elements that belong
6159 right after this element. (PENDING is normally 1;
6160 it is 0 while outputting pending elements, to avoid recursion.) */
6163 output_init_element (value, type, field, pending)
6164 tree value, type, field;
6167 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
6168 || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
6169 && !(TREE_CODE (value) == STRING_CST
6170 && TREE_CODE (type) == ARRAY_TYPE
6171 && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
6172 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
6173 TYPE_MAIN_VARIANT (type))))
6174 value = default_conversion (value);
6176 if (value == error_mark_node)
6177 constructor_erroneous = 1;
6178 else if (!TREE_CONSTANT (value))
6179 constructor_constant = 0;
6180 else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0
6181 || ((TREE_CODE (constructor_type) == RECORD_TYPE
6182 || TREE_CODE (constructor_type) == UNION_TYPE)
6183 && DECL_C_BIT_FIELD (field)
6184 && TREE_CODE (value) != INTEGER_CST))
6185 constructor_simple = 0;
6187 if (require_constant_value && ! TREE_CONSTANT (value))
6189 error_init ("initializer element is not constant");
6190 value = error_mark_node;
6192 else if (require_constant_elements
6193 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
6194 pedwarn ("initializer element is not computable at load time");
6196 /* If this field is empty (and not at the end of structure),
6197 don't do anything other than checking the initializer. */
6199 && (TREE_TYPE (field) == error_mark_node
6200 || (COMPLETE_TYPE_P (TREE_TYPE (field))
6201 && integer_zerop (TYPE_SIZE (TREE_TYPE (field)))
6202 && (TREE_CODE (constructor_type) == ARRAY_TYPE
6203 || TREE_CHAIN (field)))))
6206 if (value == error_mark_node)
6208 constructor_erroneous = 1;
6212 /* If this element doesn't come next in sequence,
6213 put it on constructor_pending_elts. */
6214 if (TREE_CODE (constructor_type) == ARRAY_TYPE
6215 && (!constructor_incremental
6216 || !tree_int_cst_equal (field, constructor_unfilled_index)))
6218 if (constructor_incremental
6219 && tree_int_cst_lt (field, constructor_unfilled_index))
6220 set_nonincremental_init ();
6222 add_pending_init (field,
6223 digest_init (type, value, require_constant_value,
6224 require_constant_elements));
6227 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6228 && (!constructor_incremental
6229 || field != constructor_unfilled_fields))
6231 /* We do this for records but not for unions. In a union,
6232 no matter which field is specified, it can be initialized
6233 right away since it starts at the beginning of the union. */
6234 if (constructor_incremental)
6236 if (!constructor_unfilled_fields)
6237 set_nonincremental_init ();
6240 tree bitpos, unfillpos;
6242 bitpos = bit_position (field);
6243 unfillpos = bit_position (constructor_unfilled_fields);
6245 if (tree_int_cst_lt (bitpos, unfillpos))
6246 set_nonincremental_init ();
6250 add_pending_init (field,
6251 digest_init (type, value, require_constant_value,
6252 require_constant_elements));
6255 else if (TREE_CODE (constructor_type) == UNION_TYPE
6256 && constructor_elements)
6258 if (TREE_SIDE_EFFECTS (TREE_VALUE (constructor_elements)))
6259 warning_init ("initialized field with side-effects overwritten");
6261 /* We can have just one union field set. */
6262 constructor_elements = 0;
6265 /* Otherwise, output this element either to
6266 constructor_elements or to the assembler file. */
6268 if (field && TREE_CODE (field) == INTEGER_CST)
6269 field = copy_node (field);
6270 constructor_elements
6271 = tree_cons (field, digest_init (type, value,
6272 require_constant_value,
6273 require_constant_elements),
6274 constructor_elements);
6276 /* Advance the variable that indicates sequential elements output. */
6277 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6278 constructor_unfilled_index
6279 = size_binop (PLUS_EXPR, constructor_unfilled_index,
6281 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6283 constructor_unfilled_fields
6284 = TREE_CHAIN (constructor_unfilled_fields);
6286 /* Skip any nameless bit fields. */
6287 while (constructor_unfilled_fields != 0
6288 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
6289 && DECL_NAME (constructor_unfilled_fields) == 0)
6290 constructor_unfilled_fields =
6291 TREE_CHAIN (constructor_unfilled_fields);
6293 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6294 constructor_unfilled_fields = 0;
6296 /* Now output any pending elements which have become next. */
6298 output_pending_init_elements (0);
6301 /* Output any pending elements which have become next.
6302 As we output elements, constructor_unfilled_{fields,index}
6303 advances, which may cause other elements to become next;
6304 if so, they too are output.
6306 If ALL is 0, we return when there are
6307 no more pending elements to output now.
6309 If ALL is 1, we output space as necessary so that
6310 we can output all the pending elements. */
6313 output_pending_init_elements (all)
6316 struct init_node *elt = constructor_pending_elts;
6321 /* Look thru the whole pending tree.
6322 If we find an element that should be output now,
6323 output it. Otherwise, set NEXT to the element
6324 that comes first among those still pending. */
6329 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6331 if (tree_int_cst_equal (elt->purpose,
6332 constructor_unfilled_index))
6333 output_init_element (elt->value,
6334 TREE_TYPE (constructor_type),
6335 constructor_unfilled_index, 0);
6336 else if (tree_int_cst_lt (constructor_unfilled_index,
6339 /* Advance to the next smaller node. */
6344 /* We have reached the smallest node bigger than the
6345 current unfilled index. Fill the space first. */
6346 next = elt->purpose;
6352 /* Advance to the next bigger node. */
6357 /* We have reached the biggest node in a subtree. Find
6358 the parent of it, which is the next bigger node. */
6359 while (elt->parent && elt->parent->right == elt)
6362 if (elt && tree_int_cst_lt (constructor_unfilled_index,
6365 next = elt->purpose;
6371 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6372 || TREE_CODE (constructor_type) == UNION_TYPE)
6374 tree ctor_unfilled_bitpos, elt_bitpos;
6376 /* If the current record is complete we are done. */
6377 if (constructor_unfilled_fields == 0)
6380 ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields);
6381 elt_bitpos = bit_position (elt->purpose);
6382 /* We can't compare fields here because there might be empty
6383 fields in between. */
6384 if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos))
6386 constructor_unfilled_fields = elt->purpose;
6387 output_init_element (elt->value, TREE_TYPE (elt->purpose),
6390 else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos))
6392 /* Advance to the next smaller node. */
6397 /* We have reached the smallest node bigger than the
6398 current unfilled field. Fill the space first. */
6399 next = elt->purpose;
6405 /* Advance to the next bigger node. */
6410 /* We have reached the biggest node in a subtree. Find
6411 the parent of it, which is the next bigger node. */
6412 while (elt->parent && elt->parent->right == elt)
6416 && (tree_int_cst_lt (ctor_unfilled_bitpos,
6417 bit_position (elt->purpose))))
6419 next = elt->purpose;
6427 /* Ordinarily return, but not if we want to output all
6428 and there are elements left. */
6429 if (! (all && next != 0))
6432 /* If it's not incremental, just skip over the gap, so that after
6433 jumping to retry we will output the next successive element. */
6434 if (TREE_CODE (constructor_type) == RECORD_TYPE
6435 || TREE_CODE (constructor_type) == UNION_TYPE)
6436 constructor_unfilled_fields = next;
6437 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6438 constructor_unfilled_index = next;
6440 /* ELT now points to the node in the pending tree with the next
6441 initializer to output. */
6445 /* Add one non-braced element to the current constructor level.
6446 This adjusts the current position within the constructor's type.
6447 This may also start or terminate implicit levels
6448 to handle a partly-braced initializer.
6450 Once this has found the correct level for the new element,
6451 it calls output_init_element. */
6454 process_init_element (value)
6457 tree orig_value = value;
6458 int string_flag = value != 0 && TREE_CODE (value) == STRING_CST;
6460 designator_depth = 0;
6461 designator_errorneous = 0;
6463 /* Handle superfluous braces around string cst as in
6464 char x[] = {"foo"}; */
6467 && TREE_CODE (constructor_type) == ARRAY_TYPE
6468 && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE
6469 && integer_zerop (constructor_unfilled_index))
6471 if (constructor_stack->replacement_value)
6472 error_init ("excess elements in char array initializer");
6473 constructor_stack->replacement_value = value;
6477 if (constructor_stack->replacement_value != 0)
6479 error_init ("excess elements in struct initializer");
6483 /* Ignore elements of a brace group if it is entirely superfluous
6484 and has already been diagnosed. */
6485 if (constructor_type == 0)
6488 /* If we've exhausted any levels that didn't have braces,
6490 while (constructor_stack->implicit)
6492 if ((TREE_CODE (constructor_type) == RECORD_TYPE
6493 || TREE_CODE (constructor_type) == UNION_TYPE)
6494 && constructor_fields == 0)
6495 process_init_element (pop_init_level (1));
6496 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
6497 && (constructor_max_index == 0
6498 || tree_int_cst_lt (constructor_max_index,
6499 constructor_index)))
6500 process_init_element (pop_init_level (1));
6505 /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */
6506 if (constructor_range_stack)
6507 value = save_expr (value);
6511 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6514 enum tree_code fieldcode;
6516 if (constructor_fields == 0)
6518 pedwarn_init ("excess elements in struct initializer");
6522 fieldtype = TREE_TYPE (constructor_fields);
6523 if (fieldtype != error_mark_node)
6524 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6525 fieldcode = TREE_CODE (fieldtype);
6527 /* Accept a string constant to initialize a subarray. */
6529 && fieldcode == ARRAY_TYPE
6530 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6533 /* Otherwise, if we have come to a subaggregate,
6534 and we don't have an element of its type, push into it. */
6535 else if (value != 0 && !constructor_no_implicit
6536 && value != error_mark_node
6537 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6538 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6539 || fieldcode == UNION_TYPE))
6541 push_init_level (1);
6547 push_member_name (constructor_fields);
6548 output_init_element (value, fieldtype, constructor_fields, 1);
6549 RESTORE_SPELLING_DEPTH (constructor_depth);
6552 /* Do the bookkeeping for an element that was
6553 directly output as a constructor. */
6555 /* For a record, keep track of end position of last field. */
6556 if (DECL_SIZE (constructor_fields))
6557 constructor_bit_index
6558 = size_binop (PLUS_EXPR,
6559 bit_position (constructor_fields),
6560 DECL_SIZE (constructor_fields));
6562 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6563 /* Skip any nameless bit fields. */
6564 while (constructor_unfilled_fields != 0
6565 && DECL_C_BIT_FIELD (constructor_unfilled_fields)
6566 && DECL_NAME (constructor_unfilled_fields) == 0)
6567 constructor_unfilled_fields =
6568 TREE_CHAIN (constructor_unfilled_fields);
6571 constructor_fields = TREE_CHAIN (constructor_fields);
6572 /* Skip any nameless bit fields at the beginning. */
6573 while (constructor_fields != 0
6574 && DECL_C_BIT_FIELD (constructor_fields)
6575 && DECL_NAME (constructor_fields) == 0)
6576 constructor_fields = TREE_CHAIN (constructor_fields);
6578 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6581 enum tree_code fieldcode;
6583 if (constructor_fields == 0)
6585 pedwarn_init ("excess elements in union initializer");
6589 fieldtype = TREE_TYPE (constructor_fields);
6590 if (fieldtype != error_mark_node)
6591 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6592 fieldcode = TREE_CODE (fieldtype);
6594 /* Warn that traditional C rejects initialization of unions.
6595 We skip the warning if the value is zero. This is done
6596 under the assumption that the zero initializer in user
6597 code appears conditioned on e.g. __STDC__ to avoid
6598 "missing initializer" warnings and relies on default
6599 initialization to zero in the traditional C case. */
6600 if (warn_traditional && !in_system_header
6601 && !(value && (integer_zerop (value) || real_zerop (value))))
6602 warning ("traditional C rejects initialization of unions");
6604 /* Accept a string constant to initialize a subarray. */
6606 && fieldcode == ARRAY_TYPE
6607 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6610 /* Otherwise, if we have come to a subaggregate,
6611 and we don't have an element of its type, push into it. */
6612 else if (value != 0 && !constructor_no_implicit
6613 && value != error_mark_node
6614 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6615 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6616 || fieldcode == UNION_TYPE))
6618 push_init_level (1);
6624 push_member_name (constructor_fields);
6625 output_init_element (value, fieldtype, constructor_fields, 1);
6626 RESTORE_SPELLING_DEPTH (constructor_depth);
6629 /* Do the bookkeeping for an element that was
6630 directly output as a constructor. */
6632 constructor_bit_index = DECL_SIZE (constructor_fields);
6633 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6636 constructor_fields = 0;
6638 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6640 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6641 enum tree_code eltcode = TREE_CODE (elttype);
6643 /* Accept a string constant to initialize a subarray. */
6645 && eltcode == ARRAY_TYPE
6646 && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE
6649 /* Otherwise, if we have come to a subaggregate,
6650 and we don't have an element of its type, push into it. */
6651 else if (value != 0 && !constructor_no_implicit
6652 && value != error_mark_node
6653 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype
6654 && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
6655 || eltcode == UNION_TYPE))
6657 push_init_level (1);
6661 if (constructor_max_index != 0
6662 && (tree_int_cst_lt (constructor_max_index, constructor_index)
6663 || integer_all_onesp (constructor_max_index)))
6665 pedwarn_init ("excess elements in array initializer");
6669 /* Now output the actual element. */
6672 push_array_bounds (tree_low_cst (constructor_index, 0));
6673 output_init_element (value, elttype, constructor_index, 1);
6674 RESTORE_SPELLING_DEPTH (constructor_depth);
6678 = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node);
6681 /* If we are doing the bookkeeping for an element that was
6682 directly output as a constructor, we must update
6683 constructor_unfilled_index. */
6684 constructor_unfilled_index = constructor_index;
6687 /* Handle the sole element allowed in a braced initializer
6688 for a scalar variable. */
6689 else if (constructor_fields == 0)
6691 pedwarn_init ("excess elements in scalar initializer");
6697 output_init_element (value, constructor_type, NULL_TREE, 1);
6698 constructor_fields = 0;
6701 /* Handle range initializers either at this level or anywhere higher
6702 in the designator stack. */
6703 if (constructor_range_stack)
6705 struct constructor_range_stack *p, *range_stack;
6708 range_stack = constructor_range_stack;
6709 constructor_range_stack = 0;
6710 while (constructor_stack != range_stack->stack)
6712 if (!constructor_stack->implicit)
6714 process_init_element (pop_init_level (1));
6716 for (p = range_stack;
6717 !p->range_end || tree_int_cst_equal (p->index, p->range_end);
6720 if (!constructor_stack->implicit)
6722 process_init_element (pop_init_level (1));
6725 p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node);
6726 if (tree_int_cst_equal (p->index, p->range_end) && !p->prev)
6731 constructor_index = p->index;
6732 constructor_fields = p->fields;
6733 if (finish && p->range_end && p->index == p->range_start)
6741 push_init_level (2);
6742 p->stack = constructor_stack;
6743 if (p->range_end && tree_int_cst_equal (p->index, p->range_end))
6744 p->index = p->range_start;
6748 constructor_range_stack = range_stack;
6755 constructor_range_stack = 0;
6758 /* Build an asm-statement, whose components are a CV_QUALIFIER, a
6759 STRING, some OUTPUTS, some INPUTS, and some CLOBBERS. */
6762 build_asm_stmt (cv_qualifier, string, outputs, inputs, clobbers)
6771 if (TREE_CHAIN (string))
6772 string = combine_strings (string);
6773 if (TREE_CODE (string) != STRING_CST)
6775 error ("asm template is not a string constant");
6779 if (cv_qualifier != NULL_TREE
6780 && cv_qualifier != ridpointers[(int) RID_VOLATILE])
6782 warning ("%s qualifier ignored on asm",
6783 IDENTIFIER_POINTER (cv_qualifier));
6784 cv_qualifier = NULL_TREE;
6787 /* We can remove output conversions that change the type,
6788 but not the mode. */
6789 for (tail = outputs; tail; tail = TREE_CHAIN (tail))
6791 tree output = TREE_VALUE (tail);
6793 STRIP_NOPS (output);
6794 TREE_VALUE (tail) = output;
6796 /* Allow conversions as LHS here. build_modify_expr as called below
6797 will do the right thing with them. */
6798 while (TREE_CODE (output) == NOP_EXPR
6799 || TREE_CODE (output) == CONVERT_EXPR
6800 || TREE_CODE (output) == FLOAT_EXPR
6801 || TREE_CODE (output) == FIX_TRUNC_EXPR
6802 || TREE_CODE (output) == FIX_FLOOR_EXPR
6803 || TREE_CODE (output) == FIX_ROUND_EXPR
6804 || TREE_CODE (output) == FIX_CEIL_EXPR)
6805 output = TREE_OPERAND (output, 0);
6807 lvalue_or_else (TREE_VALUE (tail), "invalid lvalue in asm statement");
6810 /* Remove output conversions that change the type but not the mode. */
6811 for (tail = outputs; tail; tail = TREE_CHAIN (tail))
6813 tree output = TREE_VALUE (tail);
6814 STRIP_NOPS (output);
6815 TREE_VALUE (tail) = output;
6818 /* Perform default conversions on array and function inputs.
6819 Don't do this for other types as it would screw up operands
6820 expected to be in memory. */
6821 for (tail = inputs; tail; tail = TREE_CHAIN (tail))
6822 if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE
6823 || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE)
6824 TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail));
6826 return add_stmt (build_stmt (ASM_STMT, cv_qualifier, string,
6827 outputs, inputs, clobbers));
6830 /* Expand an ASM statement with operands, handling output operands
6831 that are not variables or INDIRECT_REFS by transforming such
6832 cases into cases that expand_asm_operands can handle.
6834 Arguments are same as for expand_asm_operands. */
6837 c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
6838 tree string, outputs, inputs, clobbers;
6840 const char *filename;
6843 int noutputs = list_length (outputs);
6845 /* o[I] is the place that output number I should be written. */
6846 register tree *o = (tree *) alloca (noutputs * sizeof (tree));
6849 /* Record the contents of OUTPUTS before it is modified. */
6850 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6851 o[i] = TREE_VALUE (tail);
6853 /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of
6854 OUTPUTS some trees for where the values were actually stored. */
6855 expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line);
6857 /* Copy all the intermediate outputs into the specified outputs. */
6858 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6860 if (o[i] != TREE_VALUE (tail))
6862 expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
6863 NULL_RTX, VOIDmode, EXPAND_NORMAL);
6866 /* Restore the original value so that it's correct the next
6867 time we expand this function. */
6868 TREE_VALUE (tail) = o[i];
6870 /* Detect modification of read-only values.
6871 (Otherwise done by build_modify_expr.) */
6874 tree type = TREE_TYPE (o[i]);
6875 if (TREE_READONLY (o[i])
6876 || TYPE_READONLY (type)
6877 || ((TREE_CODE (type) == RECORD_TYPE
6878 || TREE_CODE (type) == UNION_TYPE)
6879 && C_TYPE_FIELDS_READONLY (type)))
6880 readonly_warning (o[i], "modification by `asm'");
6884 /* Those MODIFY_EXPRs could do autoincrements. */
6888 /* Expand a C `return' statement.
6889 RETVAL is the expression for what to return,
6890 or a null pointer for `return;' with no value. */
6893 c_expand_return (retval)
6896 tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
6898 if (TREE_THIS_VOLATILE (current_function_decl))
6899 warning ("function declared `noreturn' has a `return' statement");
6903 current_function_returns_null = 1;
6904 if ((warn_return_type || flag_isoc99)
6905 && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
6906 pedwarn_c99 ("`return' with no value, in function returning non-void");
6908 else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
6910 current_function_returns_null = 1;
6911 if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
6912 pedwarn ("`return' with a value, in function returning void");
6916 tree t = convert_for_assignment (valtype, retval, _("return"),
6917 NULL_TREE, NULL_TREE, 0);
6918 tree res = DECL_RESULT (current_function_decl);
6921 if (t == error_mark_node)
6924 inner = t = convert (TREE_TYPE (res), t);
6926 /* Strip any conversions, additions, and subtractions, and see if
6927 we are returning the address of a local variable. Warn if so. */
6930 switch (TREE_CODE (inner))
6932 case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR:
6934 inner = TREE_OPERAND (inner, 0);
6938 /* If the second operand of the MINUS_EXPR has a pointer
6939 type (or is converted from it), this may be valid, so
6940 don't give a warning. */
6942 tree op1 = TREE_OPERAND (inner, 1);
6944 while (! POINTER_TYPE_P (TREE_TYPE (op1))
6945 && (TREE_CODE (op1) == NOP_EXPR
6946 || TREE_CODE (op1) == NON_LVALUE_EXPR
6947 || TREE_CODE (op1) == CONVERT_EXPR))
6948 op1 = TREE_OPERAND (op1, 0);
6950 if (POINTER_TYPE_P (TREE_TYPE (op1)))
6953 inner = TREE_OPERAND (inner, 0);
6958 inner = TREE_OPERAND (inner, 0);
6960 while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r')
6961 inner = TREE_OPERAND (inner, 0);
6963 if (TREE_CODE (inner) == VAR_DECL
6964 && ! DECL_EXTERNAL (inner)
6965 && ! TREE_STATIC (inner)
6966 && DECL_CONTEXT (inner) == current_function_decl)
6967 warning ("function returns address of local variable");
6977 retval = build (MODIFY_EXPR, TREE_TYPE (res), res, t);
6978 current_function_returns_value = 1;
6981 return add_stmt (build_return_stmt (retval));
6985 /* The SWITCH_STMT being built. */
6987 /* A splay-tree mapping the low element of a case range to the high
6988 element, or NULL_TREE if there is no high element. Used to
6989 determine whether or not a new case label duplicates an old case
6990 label. We need a tree, rather than simply a hash table, because
6991 of the GNU case range extension. */
6993 /* The next node on the stack. */
6994 struct c_switch *next;
6997 /* A stack of the currently active switch statements. The innermost
6998 switch statement is on the top of the stack. There is no need to
6999 mark the stack for garbage collection because it is only active
7000 during the processing of the body of a function, and we never
7001 collect at that point. */
7003 static struct c_switch *switch_stack;
7005 /* Start a C switch statement, testing expression EXP. Return the new
7012 register enum tree_code code;
7014 struct c_switch *cs;
7016 if (exp != error_mark_node)
7018 code = TREE_CODE (TREE_TYPE (exp));
7019 type = TREE_TYPE (exp);
7021 if (code != INTEGER_TYPE
7022 && code != ENUMERAL_TYPE
7023 && code != ERROR_MARK)
7025 error ("switch quantity not an integer");
7026 exp = integer_zero_node;
7031 type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
7033 if (warn_traditional && !in_system_header
7034 && (type == long_integer_type_node
7035 || type == long_unsigned_type_node))
7036 warning ("`long' switch expression not converted to `int' in ISO C");
7038 exp = default_conversion (exp);
7039 type = TREE_TYPE (exp);
7040 index = get_unwidened (exp, NULL_TREE);
7041 /* We can't strip a conversion from a signed type to an
7042 unsigned, because if we did, int_fits_type_p would do the
7043 wrong thing when checking case values for being in range,
7044 and it's too hard to do the right thing. */
7045 if (TREE_UNSIGNED (TREE_TYPE (exp))
7046 == TREE_UNSIGNED (TREE_TYPE (index)))
7051 /* Add this new SWITCH_STMT to the stack. */
7052 cs = (struct c_switch *) xmalloc (sizeof (*cs));
7053 cs->switch_stmt = build_stmt (SWITCH_STMT, exp, NULL_TREE, NULL_TREE);
7054 cs->cases = splay_tree_new (case_compare, NULL, NULL);
7055 cs->next = switch_stack;
7058 return add_stmt (switch_stack->switch_stmt);
7061 /* Process a case label. */
7064 do_case (low_value, high_value)
7068 tree label = NULL_TREE;
7072 label = c_add_case_label (switch_stack->cases,
7073 SWITCH_COND (switch_stack->switch_stmt),
7074 low_value, high_value);
7075 if (label == error_mark_node)
7079 error ("case label not within a switch statement");
7081 error ("`default' label not within a switch statement");
7086 /* Finish the switch statement. */
7091 struct c_switch *cs = switch_stack;
7093 RECHAIN_STMTS (cs->switch_stmt, SWITCH_BODY (cs->switch_stmt));
7095 /* Pop the stack. */
7096 switch_stack = switch_stack->next;
7097 splay_tree_delete (cs->cases);