1 /* Build expressions with type checking for C compiler.
2 Copyright (C) 1987, 88, 91, 92, 93, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* This file is part of the C front end.
22 It contains routines to build C expressions given their operands,
23 including computing the types of the result, C-specific error checks,
24 and some optimization.
26 There are also routines to build RETURN_STMT nodes and CASE_STMT nodes,
27 and to process initializations in declarations (since they work
28 like a strange sort of assignment). */
36 /* Nonzero if we've already printed a "missing braces around initializer"
37 message within this initializer. */
38 static int missing_braces_mentioned;
40 extern char *index ();
41 extern char *rindex ();
43 static tree quality_type PROTO((tree, tree));
44 static int comp_target_types PROTO((tree, tree));
45 static int function_types_compatible_p PROTO((tree, tree));
46 static int type_lists_compatible_p PROTO((tree, tree));
47 static int self_promoting_type_p PROTO((tree));
48 static tree decl_constant_value PROTO((tree));
49 static tree lookup_field PROTO((tree, tree, tree *));
50 static tree convert_arguments PROTO((tree, tree, tree, tree));
51 static tree pointer_int_sum PROTO((enum tree_code, tree, tree));
52 static tree pointer_diff PROTO((tree, tree));
53 static tree unary_complex_lvalue PROTO((enum tree_code, tree));
54 static void pedantic_lvalue_warning PROTO((enum tree_code));
55 static tree internal_build_compound_expr PROTO((tree, int));
56 static tree convert_for_assignment PROTO((tree, tree, char *, tree,
58 static void warn_for_assignment PROTO((char *, char *, tree, int));
59 static tree valid_compound_expr_initializer PROTO((tree, tree));
60 static void push_string PROTO((char *));
61 static void push_member_name PROTO((tree));
62 static void push_array_bounds PROTO((int));
63 static int spelling_length PROTO((void));
64 static char *print_spelling PROTO((char *));
65 static char *get_spelling PROTO((char *));
66 static void warning_init PROTO((char *, char *,
68 static tree digest_init PROTO((tree, tree, int, int));
69 static void check_init_type_bitfields PROTO((tree));
70 static void output_init_element PROTO((tree, tree, tree, int));
71 static void output_pending_init_elements PROTO((int));
73 /* Do `exp = require_complete_type (exp);' to make sure exp
74 does not have an incomplete type. (That includes void types.) */
77 require_complete_type (value)
80 tree type = TREE_TYPE (value);
82 /* First, detect a valid value with a complete type. */
83 if (TYPE_SIZE (type) != 0
84 && type != void_type_node)
87 incomplete_type_error (value, type);
88 return error_mark_node;
91 /* Print an error message for invalid use of an incomplete type.
92 VALUE is the expression that was used (or 0 if that isn't known)
93 and TYPE is the type that was invalid. */
96 incomplete_type_error (value, type)
102 /* Avoid duplicate error message. */
103 if (TREE_CODE (type) == ERROR_MARK)
106 if (value != 0 && (TREE_CODE (value) == VAR_DECL
107 || TREE_CODE (value) == PARM_DECL))
108 error ("`%s' has an incomplete type",
109 IDENTIFIER_POINTER (DECL_NAME (value)));
113 /* We must print an error message. Be clever about what it says. */
115 switch (TREE_CODE (type))
118 errmsg = "invalid use of undefined type `struct %s'";
122 errmsg = "invalid use of undefined type `union %s'";
126 errmsg = "invalid use of undefined type `enum %s'";
130 error ("invalid use of void expression");
134 if (TYPE_DOMAIN (type))
136 type = TREE_TYPE (type);
139 error ("invalid use of array with unspecified bounds");
146 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
147 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
149 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
150 error ("invalid use of incomplete typedef `%s'",
151 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
155 /* Return a variant of TYPE which has all the type qualifiers of LIKE
156 as well as those of TYPE. */
159 qualify_type (type, like)
162 int constflag = TYPE_READONLY (type) || TYPE_READONLY (like);
163 int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like);
164 return c_build_type_variant (type, constflag, volflag);
167 /* Return the common type of two types.
168 We assume that comptypes has already been done and returned 1;
169 if that isn't so, this may crash. In particular, we assume that qualifiers
172 This is the type for the result of most arithmetic operations
173 if the operands have the given two types. */
179 register enum tree_code code1;
180 register enum tree_code code2;
183 /* Save time if the two types are the same. */
185 if (t1 == t2) return t1;
187 /* If one type is nonsense, use the other. */
188 if (t1 == error_mark_node)
190 if (t2 == error_mark_node)
193 /* Merge the attributes */
195 { register tree a1, a2;
196 a1 = TYPE_ATTRIBUTES (t1);
197 a2 = TYPE_ATTRIBUTES (t2);
199 /* Either one unset? Take the set one. */
201 if (!(attributes = a1))
204 /* One that completely contains the other? Take it. */
206 else if (a2 && !attribute_list_contained (a1, a2))
207 if (attribute_list_contained (a2, a1))
211 /* Pick the longest list, and hang on the other
214 if (list_length (a1) < list_length (a2))
215 attributes = a2, a2 = a1;
217 for (; a2; a2 = TREE_CHAIN (a2))
218 if (!value_member (attributes, a2))
221 TREE_CHAIN (a1) = attributes;
227 /* Treat an enum type as the unsigned integer type of the same width. */
229 if (TREE_CODE (t1) == ENUMERAL_TYPE)
230 t1 = type_for_size (TYPE_PRECISION (t1), 1);
231 if (TREE_CODE (t2) == ENUMERAL_TYPE)
232 t2 = type_for_size (TYPE_PRECISION (t2), 1);
234 code1 = TREE_CODE (t1);
235 code2 = TREE_CODE (t2);
237 /* If one type is complex, form the common type of the non-complex
238 components, then make that complex. Use T1 or T2 if it is the
240 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
242 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
243 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
244 tree subtype = common_type (subtype1, subtype2);
246 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
247 return build_type_attribute_variant (t1, attributes);
248 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
249 return build_type_attribute_variant (t2, attributes);
251 return build_type_attribute_variant (build_complex_type (subtype),
259 /* If only one is real, use it as the result. */
261 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
262 return build_type_attribute_variant (t1, attributes);
264 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
265 return build_type_attribute_variant (t2, attributes);
267 /* Both real or both integers; use the one with greater precision. */
269 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
270 return build_type_attribute_variant (t1, attributes);
271 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
272 return build_type_attribute_variant (t2, attributes);
274 /* Same precision. Prefer longs to ints even when same size. */
276 if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
277 || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
278 return build_type_attribute_variant (long_unsigned_type_node,
281 if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
282 || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
284 /* But preserve unsignedness from the other type,
285 since long cannot hold all the values of an unsigned int. */
286 if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
287 t1 = long_unsigned_type_node;
289 t1 = long_integer_type_node;
290 return build_type_attribute_variant (t1, attributes);
293 /* Otherwise prefer the unsigned one. */
295 if (TREE_UNSIGNED (t1))
296 return build_type_attribute_variant (t1, attributes);
298 return build_type_attribute_variant (t2, attributes);
301 /* For two pointers, do this recursively on the target type,
302 and combine the qualifiers of the two types' targets. */
303 /* This code was turned off; I don't know why.
304 But ANSI C specifies doing this with the qualifiers.
305 So I turned it on again. */
307 tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)),
308 TYPE_MAIN_VARIANT (TREE_TYPE (t2)));
310 = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2));
312 = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2));
313 t1 = build_pointer_type (c_build_type_variant (target, constp,
315 return build_type_attribute_variant (t1, attributes);
318 t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2)));
319 return build_type_attribute_variant (t1, attributes);
324 tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
325 /* Save space: see if the result is identical to one of the args. */
326 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1))
327 return build_type_attribute_variant (t1, attributes);
328 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2))
329 return build_type_attribute_variant (t2, attributes);
330 /* Merge the element types, and have a size if either arg has one. */
331 t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2));
332 return build_type_attribute_variant (t1, attributes);
336 /* Function types: prefer the one that specified arg types.
337 If both do, merge the arg types. Also merge the return types. */
339 tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
340 tree p1 = TYPE_ARG_TYPES (t1);
341 tree p2 = TYPE_ARG_TYPES (t2);
346 /* Save space: see if the result is identical to one of the args. */
347 if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2))
348 return build_type_attribute_variant (t1, attributes);
349 if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1))
350 return build_type_attribute_variant (t2, attributes);
352 /* Simple way if one arg fails to specify argument types. */
353 if (TYPE_ARG_TYPES (t1) == 0)
355 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2));
356 return build_type_attribute_variant (t1, attributes);
358 if (TYPE_ARG_TYPES (t2) == 0)
360 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1));
361 return build_type_attribute_variant (t1, attributes);
364 /* If both args specify argument types, we must merge the two
365 lists, argument by argument. */
367 len = list_length (p1);
370 for (i = 0; i < len; i++)
371 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
376 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n))
378 /* A null type means arg type is not specified.
379 Take whatever the other function type has. */
380 if (TREE_VALUE (p1) == 0)
382 TREE_VALUE (n) = TREE_VALUE (p2);
385 if (TREE_VALUE (p2) == 0)
387 TREE_VALUE (n) = TREE_VALUE (p1);
391 /* Given wait (union {union wait *u; int *i} *)
392 and wait (union wait *),
393 prefer union wait * as type of parm. */
394 if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE
395 && TREE_VALUE (p1) != TREE_VALUE (p2))
398 for (memb = TYPE_FIELDS (TREE_VALUE (p1));
399 memb; memb = TREE_CHAIN (memb))
400 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2)))
402 TREE_VALUE (n) = TREE_VALUE (p2);
404 pedwarn ("function types not truly compatible in ANSI C");
408 if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE
409 && TREE_VALUE (p2) != TREE_VALUE (p1))
412 for (memb = TYPE_FIELDS (TREE_VALUE (p2));
413 memb; memb = TREE_CHAIN (memb))
414 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1)))
416 TREE_VALUE (n) = TREE_VALUE (p1);
418 pedwarn ("function types not truly compatible in ANSI C");
422 TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2));
426 t1 = build_function_type (valtype, newargs);
427 /* ... falls through ... */
431 return build_type_attribute_variant (t1, attributes);
436 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
437 or various other operations. Return 2 if they are compatible
438 but a warning may be needed if you use them together. */
441 comptypes (type1, type2)
444 register tree t1 = type1;
445 register tree t2 = type2;
448 /* Suppress errors caused by previously reported errors. */
450 if (t1 == t2 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK)
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_READONLY (t1) != TYPE_READONLY (t2))
472 if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2))
475 /* Allow for two different type nodes which have essentially the same
476 definition. Note that we already checked for equality of the type
477 type qualifiers (just above). */
479 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
482 #ifndef COMP_TYPE_ATTRIBUTES
483 #define COMP_TYPE_ATTRIBUTES(t1,t2) 1
486 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
487 if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2)))
490 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
493 switch (TREE_CODE (t1))
496 val = (TREE_TYPE (t1) == TREE_TYPE (t2)
497 ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2)));
501 val = function_types_compatible_p (t1, t2);
506 tree d1 = TYPE_DOMAIN (t1);
507 tree d2 = TYPE_DOMAIN (t2);
510 /* Target types must match incl. qualifiers. */
511 if (TREE_TYPE (t1) != TREE_TYPE (t2)
512 && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2))))
515 /* Sizes must match unless one is missing or variable. */
516 if (d1 == 0 || d2 == 0 || d1 == d2
517 || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
518 || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
519 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST
520 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)
523 if (! ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1))
524 == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2)))
525 && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1))
526 == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2)))
527 && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1))
528 == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2)))
529 && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1))
530 == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))))
536 if (maybe_objc_comptypes (t1, t2, 0) == 1)
540 return attrval == 2 && val == 1 ? 2 : val;
543 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
544 ignoring their qualifiers. */
547 comp_target_types (ttl, ttr)
552 /* Give maybe_objc_comptypes a crack at letting these types through. */
553 if (val = maybe_objc_comptypes (ttl, ttr, 1) >= 0)
556 val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
557 TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
559 if (val == 2 && pedantic)
560 pedwarn ("types are not quite compatible");
564 /* Subroutines of `comptypes'. */
566 /* Return 1 if two function types F1 and F2 are compatible.
567 If either type specifies no argument types,
568 the other must specify a fixed number of self-promoting arg types.
569 Otherwise, if one type specifies only the number of arguments,
570 the other must specify that number of self-promoting arg types.
571 Otherwise, the argument types must match. */
574 function_types_compatible_p (f1, f2)
578 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
582 if (!(TREE_TYPE (f1) == TREE_TYPE (f2)
583 || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2)))))
586 args1 = TYPE_ARG_TYPES (f1);
587 args2 = TYPE_ARG_TYPES (f2);
589 /* An unspecified parmlist matches any specified parmlist
590 whose argument types don't need default promotions. */
594 if (!self_promoting_args_p (args2))
596 /* If one of these types comes from a non-prototype fn definition,
597 compare that with the other type's arglist.
598 If they don't match, ask for a warning (but no error). */
599 if (TYPE_ACTUAL_ARG_TYPES (f1)
600 && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1)))
606 if (!self_promoting_args_p (args1))
608 if (TYPE_ACTUAL_ARG_TYPES (f2)
609 && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2)))
614 /* Both types have argument lists: compare them and propagate results. */
615 val1 = type_lists_compatible_p (args1, args2);
616 return val1 != 1 ? val1 : val;
619 /* Check two lists of types for compatibility,
620 returning 0 for incompatible, 1 for compatible,
621 or 2 for compatible with warning. */
624 type_lists_compatible_p (args1, args2)
627 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
633 if (args1 == 0 && args2 == 0)
635 /* If one list is shorter than the other,
636 they fail to match. */
637 if (args1 == 0 || args2 == 0)
639 /* A null pointer instead of a type
640 means there is supposed to be an argument
641 but nothing is specified about what type it has.
642 So match anything that self-promotes. */
643 if (TREE_VALUE (args1) == 0)
645 if (! self_promoting_type_p (TREE_VALUE (args2)))
648 else if (TREE_VALUE (args2) == 0)
650 if (! self_promoting_type_p (TREE_VALUE (args1)))
653 else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2))))
655 /* Allow wait (union {union wait *u; int *i} *)
656 and wait (union wait *) to be compatible. */
657 if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE
658 && (TYPE_NAME (TREE_VALUE (args1)) == 0
659 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args1)))
660 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST
661 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)),
662 TYPE_SIZE (TREE_VALUE (args2))))
665 for (memb = TYPE_FIELDS (TREE_VALUE (args1));
666 memb; memb = TREE_CHAIN (memb))
667 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2)))
672 else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE
673 && (TYPE_NAME (TREE_VALUE (args2)) == 0
674 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args2)))
675 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST
676 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)),
677 TYPE_SIZE (TREE_VALUE (args1))))
680 for (memb = TYPE_FIELDS (TREE_VALUE (args2));
681 memb; memb = TREE_CHAIN (memb))
682 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1)))
691 /* comptypes said ok, but record if it said to warn. */
695 args1 = TREE_CHAIN (args1);
696 args2 = TREE_CHAIN (args2);
700 /* Return 1 if PARMS specifies a fixed number of parameters
701 and none of their types is affected by default promotions. */
704 self_promoting_args_p (parms)
708 for (t = parms; t; t = TREE_CHAIN (t))
710 register tree type = TREE_VALUE (t);
712 if (TREE_CHAIN (t) == 0 && type != void_type_node)
718 if (TYPE_MAIN_VARIANT (type) == float_type_node)
721 if (C_PROMOTING_INTEGER_TYPE_P (type))
727 /* Return 1 if TYPE is not affected by default promotions. */
730 self_promoting_type_p (type)
733 if (TYPE_MAIN_VARIANT (type) == float_type_node)
736 if (C_PROMOTING_INTEGER_TYPE_P (type))
742 /* Return an unsigned type the same as TYPE in other respects. */
748 tree type1 = TYPE_MAIN_VARIANT (type);
749 if (type1 == signed_char_type_node || type1 == char_type_node)
750 return unsigned_char_type_node;
751 if (type1 == integer_type_node)
752 return unsigned_type_node;
753 if (type1 == short_integer_type_node)
754 return short_unsigned_type_node;
755 if (type1 == long_integer_type_node)
756 return long_unsigned_type_node;
757 if (type1 == long_long_integer_type_node)
758 return long_long_unsigned_type_node;
762 /* Return a signed type the same as TYPE in other respects. */
768 tree type1 = TYPE_MAIN_VARIANT (type);
769 if (type1 == unsigned_char_type_node || type1 == char_type_node)
770 return signed_char_type_node;
771 if (type1 == unsigned_type_node)
772 return integer_type_node;
773 if (type1 == short_unsigned_type_node)
774 return short_integer_type_node;
775 if (type1 == long_unsigned_type_node)
776 return long_integer_type_node;
777 if (type1 == long_long_unsigned_type_node)
778 return long_long_integer_type_node;
782 /* Return a type the same as TYPE except unsigned or
783 signed according to UNSIGNEDP. */
786 signed_or_unsigned_type (unsignedp, type)
790 if (! INTEGRAL_TYPE_P (type))
792 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
793 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
794 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
795 return unsignedp ? unsigned_type_node : integer_type_node;
796 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
797 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
798 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
799 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
800 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
801 return (unsignedp ? long_long_unsigned_type_node
802 : long_long_integer_type_node);
806 /* Compute the value of the `sizeof' operator. */
812 enum tree_code code = TREE_CODE (type);
815 if (code == FUNCTION_TYPE)
817 if (pedantic || warn_pointer_arith)
818 pedwarn ("sizeof applied to a function type");
821 if (code == VOID_TYPE)
823 if (pedantic || warn_pointer_arith)
824 pedwarn ("sizeof applied to a void type");
827 if (code == ERROR_MARK)
829 if (TYPE_SIZE (type) == 0)
831 error ("sizeof applied to an incomplete type");
835 /* Convert in case a char is more than one unit. */
836 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
837 size_int (TYPE_PRECISION (char_type_node)));
838 /* size_binop does not put the constant in range, so do it now. */
839 if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0))
840 TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1;
845 c_sizeof_nowarn (type)
848 enum tree_code code = TREE_CODE (type);
851 if (code == FUNCTION_TYPE
853 || code == ERROR_MARK)
855 if (TYPE_SIZE (type) == 0)
858 /* Convert in case a char is more than one unit. */
859 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
860 size_int (TYPE_PRECISION (char_type_node)));
861 force_fit_type (t, 0);
865 /* Compute the size to increment a pointer by. */
868 c_size_in_bytes (type)
871 enum tree_code code = TREE_CODE (type);
874 if (code == FUNCTION_TYPE)
876 if (code == VOID_TYPE)
878 if (code == ERROR_MARK)
880 if (TYPE_SIZE (type) == 0)
882 error ("arithmetic on pointer to an incomplete type");
886 /* Convert in case a char is more than one unit. */
887 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
888 size_int (BITS_PER_UNIT));
889 force_fit_type (t, 0);
893 /* Implement the __alignof keyword: Return the minimum required
894 alignment of TYPE, measured in bytes. */
900 enum tree_code code = TREE_CODE (type);
902 if (code == FUNCTION_TYPE)
903 return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
905 if (code == VOID_TYPE || code == ERROR_MARK)
908 return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
911 /* Implement the __alignof keyword: Return the minimum required
912 alignment of EXPR, measured in bytes. For VAR_DECL's and
913 FIELD_DECL's return DECL_ALIGN (which can be set from an
914 "aligned" __attribute__ specification). */
917 c_alignof_expr (expr)
920 if (TREE_CODE (expr) == VAR_DECL)
921 return size_int (DECL_ALIGN (expr) / BITS_PER_UNIT);
923 if (TREE_CODE (expr) == COMPONENT_REF
924 && DECL_BIT_FIELD (TREE_OPERAND (expr, 1)))
926 error ("`__alignof' applied to a bit-field");
929 else if (TREE_CODE (expr) == COMPONENT_REF
930 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
931 return size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT);
933 if (TREE_CODE (expr) == INDIRECT_REF)
935 tree t = TREE_OPERAND (expr, 0);
937 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
939 while (TREE_CODE (t) == NOP_EXPR
940 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
944 t = TREE_OPERAND (t, 0);
945 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
946 if (thisalign > bestalign)
947 best = t, bestalign = thisalign;
949 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
952 return c_alignof (TREE_TYPE (expr));
954 /* Return either DECL or its known constant value (if it has one). */
957 decl_constant_value (decl)
960 if (! TREE_PUBLIC (decl)
961 /* Don't change a variable array bound or initial value to a constant
962 in a place where a variable is invalid. */
963 && current_function_decl != 0
965 && ! TREE_THIS_VOLATILE (decl)
966 && TREE_READONLY (decl) && ! ITERATOR_P (decl)
967 && DECL_INITIAL (decl) != 0
968 && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK
969 /* This is invalid if initial value is not constant.
970 If it has either a function call, a memory reference,
971 or a variable, then re-evaluating it could give different results. */
972 && TREE_CONSTANT (DECL_INITIAL (decl))
973 /* Check for cases where this is sub-optimal, even though valid. */
974 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR
975 && DECL_MODE (decl) != BLKmode)
976 return DECL_INITIAL (decl);
980 /* Perform default promotions for C data used in expressions.
981 Arrays and functions are converted to pointers;
982 enumeral types or short or char, to int.
983 In addition, manifest constants symbols are replaced by their values. */
986 default_conversion (exp)
989 register tree type = TREE_TYPE (exp);
990 register enum tree_code code = TREE_CODE (type);
992 /* Constants can be used directly unless they're not loadable. */
993 if (TREE_CODE (exp) == CONST_DECL)
994 exp = DECL_INITIAL (exp);
996 /* Replace a nonvolatile const static variable with its value unless
997 it is an array, in which case we must be sure that taking the
998 address of the array produces consistent results. */
999 else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE)
1001 exp = decl_constant_value (exp);
1002 type = TREE_TYPE (exp);
1005 /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as
1007 /* Do not use STRIP_NOPS here! It will remove conversions from pointer
1008 to integer and cause infinite recursion. */
1009 while (TREE_CODE (exp) == NON_LVALUE_EXPR
1010 || (TREE_CODE (exp) == NOP_EXPR
1011 && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp)))
1012 exp = TREE_OPERAND (exp, 0);
1014 /* Normally convert enums to int,
1015 but convert wide enums to something wider. */
1016 if (code == ENUMERAL_TYPE)
1018 type = type_for_size (MAX (TYPE_PRECISION (type),
1019 TYPE_PRECISION (integer_type_node)),
1021 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
1022 && TREE_UNSIGNED (type)));
1023 return convert (type, exp);
1026 if (C_PROMOTING_INTEGER_TYPE_P (type))
1028 /* Traditionally, unsignedness is preserved in default promotions.
1029 Also preserve unsignedness if not really getting any wider. */
1030 if (TREE_UNSIGNED (type)
1031 && (flag_traditional
1032 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
1033 return convert (unsigned_type_node, exp);
1034 return convert (integer_type_node, exp);
1036 if (flag_traditional && !flag_allow_single_precision
1037 && TYPE_MAIN_VARIANT (type) == float_type_node)
1038 return convert (double_type_node, exp);
1039 if (code == VOID_TYPE)
1041 error ("void value not ignored as it ought to be");
1042 return error_mark_node;
1044 if (code == FUNCTION_TYPE)
1046 return build_unary_op (ADDR_EXPR, exp, 0);
1048 if (code == ARRAY_TYPE)
1051 tree restype = TREE_TYPE (type);
1056 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r'
1057 || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
1059 constp = TREE_READONLY (exp);
1060 volatilep = TREE_THIS_VOLATILE (exp);
1063 if (TYPE_READONLY (type) || TYPE_VOLATILE (type)
1064 || constp || volatilep)
1065 restype = c_build_type_variant (restype,
1066 TYPE_READONLY (type) || constp,
1067 TYPE_VOLATILE (type) || volatilep);
1069 if (TREE_CODE (exp) == INDIRECT_REF)
1070 return convert (TYPE_POINTER_TO (restype),
1071 TREE_OPERAND (exp, 0));
1073 if (TREE_CODE (exp) == COMPOUND_EXPR)
1075 tree op1 = default_conversion (TREE_OPERAND (exp, 1));
1076 return build (COMPOUND_EXPR, TREE_TYPE (op1),
1077 TREE_OPERAND (exp, 0), op1);
1081 && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp)))
1083 error ("invalid use of non-lvalue array");
1084 return error_mark_node;
1087 ptrtype = build_pointer_type (restype);
1089 if (TREE_CODE (exp) == VAR_DECL)
1091 /* ??? This is not really quite correct
1092 in that the type of the operand of ADDR_EXPR
1093 is not the target type of the type of the ADDR_EXPR itself.
1094 Question is, can this lossage be avoided? */
1095 adr = build1 (ADDR_EXPR, ptrtype, exp);
1096 if (mark_addressable (exp) == 0)
1097 return error_mark_node;
1098 TREE_CONSTANT (adr) = staticp (exp);
1099 TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
1102 /* This way is better for a COMPONENT_REF since it can
1103 simplify the offset for a component. */
1104 adr = build_unary_op (ADDR_EXPR, exp, 1);
1105 return convert (ptrtype, adr);
1110 /* Look up component name in the structure type definition.
1112 If this component name is found indirectly within an anonymous union,
1113 store in *INDIRECT the component which directly contains
1114 that anonymous union. Otherwise, set *INDIRECT to 0. */
1117 lookup_field (type, component, indirect)
1118 tree type, component;
1123 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1124 to the field elements. Use a binary search on this array to quickly
1125 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1126 will always be set for structures which have many elements. */
1128 if (TYPE_LANG_SPECIFIC (type))
1131 tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0];
1133 field = TYPE_FIELDS (type);
1135 top = TYPE_LANG_SPECIFIC (type)->len;
1136 while (top - bot > 1)
1140 half = (top - bot + 1) >> 1;
1141 field = field_array[bot+half];
1143 if (DECL_NAME (field) == NULL_TREE)
1145 /* Step through all anon unions in linear fashion. */
1146 while (DECL_NAME (field_array[bot]) == NULL_TREE)
1150 field = field_array[bot++];
1151 anon = lookup_field (TREE_TYPE (field), component, &junk);
1152 if (anon != NULL_TREE)
1159 /* Entire record is only anon unions. */
1163 /* Restart the binary search, with new lower bound. */
1167 cmp = (HOST_WIDE_INT) DECL_NAME (field) - (HOST_WIDE_INT) component;
1176 if (DECL_NAME (field_array[bot]) == component)
1177 field = field_array[bot];
1178 else if (DECL_NAME (field) != component)
1183 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1185 if (DECL_NAME (field) == NULL_TREE)
1188 tree anon = lookup_field (TREE_TYPE (field), component, &junk);
1189 if (anon != NULL_TREE)
1196 if (DECL_NAME (field) == component)
1201 *indirect = NULL_TREE;
1205 /* Make an expression to refer to the COMPONENT field of
1206 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1209 build_component_ref (datum, component)
1210 tree datum, component;
1212 register tree type = TREE_TYPE (datum);
1213 register enum tree_code code = TREE_CODE (type);
1214 register tree field = NULL;
1217 /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it
1218 unless we are not to support things not strictly ANSI. */
1219 switch (TREE_CODE (datum))
1223 tree value = build_component_ref (TREE_OPERAND (datum, 1), component);
1224 return build (COMPOUND_EXPR, TREE_TYPE (value),
1225 TREE_OPERAND (datum, 0), value);
1228 return build_conditional_expr
1229 (TREE_OPERAND (datum, 0),
1230 build_component_ref (TREE_OPERAND (datum, 1), component),
1231 build_component_ref (TREE_OPERAND (datum, 2), component));
1234 /* See if there is a field or component with name COMPONENT. */
1236 if (code == RECORD_TYPE || code == UNION_TYPE)
1240 if (TYPE_SIZE (type) == 0)
1242 incomplete_type_error (NULL_TREE, type);
1243 return error_mark_node;
1246 field = lookup_field (type, component, &indirect);
1250 error (code == RECORD_TYPE
1251 ? "structure has no member named `%s'"
1252 : "union has no member named `%s'",
1253 IDENTIFIER_POINTER (component));
1254 return error_mark_node;
1256 if (TREE_TYPE (field) == error_mark_node)
1257 return error_mark_node;
1259 /* If FIELD was found buried within an anonymous union,
1260 make one COMPONENT_REF to get that anonymous union,
1261 then fall thru to make a second COMPONENT_REF to get FIELD. */
1264 ref = build (COMPONENT_REF, TREE_TYPE (indirect), datum, indirect);
1265 if (TREE_READONLY (datum) || TREE_READONLY (indirect))
1266 TREE_READONLY (ref) = 1;
1267 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (indirect))
1268 TREE_THIS_VOLATILE (ref) = 1;
1272 ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field);
1274 if (TREE_READONLY (datum) || TREE_READONLY (field))
1275 TREE_READONLY (ref) = 1;
1276 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field))
1277 TREE_THIS_VOLATILE (ref) = 1;
1281 else if (code != ERROR_MARK)
1282 error ("request for member `%s' in something not a structure or union",
1283 IDENTIFIER_POINTER (component));
1285 return error_mark_node;
1288 /* Given an expression PTR for a pointer, return an expression
1289 for the value pointed to.
1290 ERRORSTRING is the name of the operator to appear in error messages. */
1293 build_indirect_ref (ptr, errorstring)
1297 register tree pointer = default_conversion (ptr);
1298 register tree type = TREE_TYPE (pointer);
1300 if (TREE_CODE (type) == POINTER_TYPE)
1302 if (TREE_CODE (pointer) == ADDR_EXPR
1304 && (TREE_TYPE (TREE_OPERAND (pointer, 0))
1305 == TREE_TYPE (type)))
1306 return TREE_OPERAND (pointer, 0);
1309 tree t = TREE_TYPE (type);
1310 register tree ref = build1 (INDIRECT_REF,
1311 TYPE_MAIN_VARIANT (t), pointer);
1313 if (TYPE_SIZE (t) == 0 && TREE_CODE (t) != ARRAY_TYPE)
1315 error ("dereferencing pointer to incomplete type");
1316 return error_mark_node;
1318 if (TREE_CODE (t) == VOID_TYPE)
1319 warning ("dereferencing `void *' pointer");
1321 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
1322 so that we get the proper error message if the result is used
1323 to assign to. Also, &* is supposed to be a no-op.
1324 And ANSI C seems to specify that the type of the result
1325 should be the const type. */
1326 /* A de-reference of a pointer to const is not a const. It is valid
1327 to change it via some other pointer. */
1328 TREE_READONLY (ref) = TYPE_READONLY (t);
1329 TREE_SIDE_EFFECTS (ref)
1330 = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile;
1331 TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
1335 else if (TREE_CODE (pointer) != ERROR_MARK)
1336 error ("invalid type argument of `%s'", errorstring);
1337 return error_mark_node;
1340 /* This handles expressions of the form "a[i]", which denotes
1343 This is logically equivalent in C to *(a+i), but we may do it differently.
1344 If A is a variable or a member, we generate a primitive ARRAY_REF.
1345 This avoids forcing the array out of registers, and can work on
1346 arrays that are not lvalues (for example, members of structures returned
1350 build_array_ref (array, index)
1355 error ("subscript missing in array reference");
1356 return error_mark_node;
1359 if (TREE_TYPE (array) == error_mark_node
1360 || TREE_TYPE (index) == error_mark_node)
1361 return error_mark_node;
1363 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE
1364 && TREE_CODE (array) != INDIRECT_REF)
1368 /* Subscripting with type char is likely to lose
1369 on a machine where chars are signed.
1370 So warn on any machine, but optionally.
1371 Don't warn for unsigned char since that type is safe.
1372 Don't warn for signed char because anyone who uses that
1373 must have done so deliberately. */
1374 if (warn_char_subscripts
1375 && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node)
1376 warning ("array subscript has type `char'");
1378 /* Apply default promotions *after* noticing character types. */
1379 index = default_conversion (index);
1381 /* Require integer *after* promotion, for sake of enums. */
1382 if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE)
1384 error ("array subscript is not an integer");
1385 return error_mark_node;
1388 /* An array that is indexed by a non-constant
1389 cannot be stored in a register; we must be able to do
1390 address arithmetic on its address.
1391 Likewise an array of elements of variable size. */
1392 if (TREE_CODE (index) != INTEGER_CST
1393 || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0
1394 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST))
1396 if (mark_addressable (array) == 0)
1397 return error_mark_node;
1399 /* An array that is indexed by a constant value which is not within
1400 the array bounds cannot be stored in a register either; because we
1401 would get a crash in store_bit_field/extract_bit_field when trying
1402 to access a non-existent part of the register. */
1403 if (TREE_CODE (index) == INTEGER_CST
1404 && TYPE_VALUES (TREE_TYPE (array))
1405 && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array))))
1407 if (mark_addressable (array) == 0)
1408 return error_mark_node;
1411 if (pedantic && !lvalue_p (array))
1413 if (DECL_REGISTER (array))
1414 pedwarn ("ANSI C forbids subscripting `register' array");
1416 pedwarn ("ANSI C forbids subscripting non-lvalue array");
1422 while (TREE_CODE (foo) == COMPONENT_REF)
1423 foo = TREE_OPERAND (foo, 0);
1424 if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo))
1425 pedwarn ("ANSI C forbids subscripting non-lvalue array");
1428 type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array)));
1429 rval = build (ARRAY_REF, type, array, index);
1430 /* Array ref is const/volatile if the array elements are
1431 or if the array is. */
1432 TREE_READONLY (rval)
1433 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array)))
1434 | TREE_READONLY (array));
1435 TREE_SIDE_EFFECTS (rval)
1436 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1437 | TREE_SIDE_EFFECTS (array));
1438 TREE_THIS_VOLATILE (rval)
1439 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1440 /* This was added by rms on 16 Nov 91.
1441 It fixes vol struct foo *a; a->elts[1]
1442 in an inline function.
1443 Hope it doesn't break something else. */
1444 | TREE_THIS_VOLATILE (array));
1445 return require_complete_type (fold (rval));
1449 tree ar = default_conversion (array);
1450 tree ind = default_conversion (index);
1452 /* Put the integer in IND to simplify error checking. */
1453 if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE)
1460 if (ar == error_mark_node)
1463 if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE)
1465 error ("subscripted value is neither array nor pointer");
1466 return error_mark_node;
1468 if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE)
1470 error ("array subscript is not an integer");
1471 return error_mark_node;
1474 return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0),
1479 /* Build a function call to function FUNCTION with parameters PARAMS.
1480 PARAMS is a list--a chain of TREE_LIST nodes--in which the
1481 TREE_VALUE of each node is a parameter-expression.
1482 FUNCTION's data type may be a function type or a pointer-to-function. */
1485 build_function_call (function, params)
1486 tree function, params;
1488 register tree fntype, fundecl = 0;
1489 register tree coerced_params;
1490 tree name = NULL_TREE, assembler_name = NULL_TREE;
1492 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1493 STRIP_TYPE_NOPS (function);
1495 /* Convert anything with function type to a pointer-to-function. */
1496 if (TREE_CODE (function) == FUNCTION_DECL)
1498 name = DECL_NAME (function);
1499 assembler_name = DECL_ASSEMBLER_NAME (function);
1501 /* Differs from default_conversion by not setting TREE_ADDRESSABLE
1502 (because calling an inline function does not mean the function
1503 needs to be separately compiled). */
1504 fntype = build_type_variant (TREE_TYPE (function),
1505 TREE_READONLY (function),
1506 TREE_THIS_VOLATILE (function));
1508 function = build1 (ADDR_EXPR, build_pointer_type (fntype), function);
1511 function = default_conversion (function);
1513 fntype = TREE_TYPE (function);
1515 if (TREE_CODE (fntype) == ERROR_MARK)
1516 return error_mark_node;
1518 if (!(TREE_CODE (fntype) == POINTER_TYPE
1519 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE))
1521 error ("called object is not a function");
1522 return error_mark_node;
1525 /* fntype now gets the type of function pointed to. */
1526 fntype = TREE_TYPE (fntype);
1528 /* Convert the parameters to the types declared in the
1529 function prototype, or apply default promotions. */
1532 = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl);
1534 /* Check for errors in format strings. */
1536 if (warn_format && (name || assembler_name))
1537 check_function_format (name, assembler_name, coerced_params);
1539 /* Recognize certain built-in functions so we can make tree-codes
1540 other than CALL_EXPR. We do this when it enables fold-const.c
1541 to do something useful. */
1543 if (TREE_CODE (function) == ADDR_EXPR
1544 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
1545 && DECL_BUILT_IN (TREE_OPERAND (function, 0)))
1546 switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0)))
1551 if (coerced_params == 0)
1552 return integer_zero_node;
1553 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
1557 register tree result
1558 = build (CALL_EXPR, TREE_TYPE (fntype),
1559 function, coerced_params, NULL_TREE);
1561 TREE_SIDE_EFFECTS (result) = 1;
1562 if (TREE_TYPE (result) == void_type_node)
1564 return require_complete_type (result);
1568 /* Convert the argument expressions in the list VALUES
1569 to the types in the list TYPELIST. The result is a list of converted
1570 argument expressions.
1572 If TYPELIST is exhausted, or when an element has NULL as its type,
1573 perform the default conversions.
1575 PARMLIST is the chain of parm decls for the function being called.
1576 It may be 0, if that info is not available.
1577 It is used only for generating error messages.
1579 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
1581 This is also where warnings about wrong number of args are generated.
1583 Both VALUES and the returned value are chains of TREE_LIST nodes
1584 with the elements of the list in the TREE_VALUE slots of those nodes. */
1587 convert_arguments (typelist, values, name, fundecl)
1588 tree typelist, values, name, fundecl;
1590 register tree typetail, valtail;
1591 register tree result = NULL;
1594 /* Scan the given expressions and types, producing individual
1595 converted arguments and pushing them on RESULT in reverse order. */
1597 for (valtail = values, typetail = typelist, parmnum = 0;
1599 valtail = TREE_CHAIN (valtail), parmnum++)
1601 register tree type = typetail ? TREE_VALUE (typetail) : 0;
1602 register tree val = TREE_VALUE (valtail);
1604 if (type == void_type_node)
1607 error ("too many arguments to function `%s'",
1608 IDENTIFIER_POINTER (name));
1610 error ("too many arguments to function");
1614 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1615 /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0
1616 to convert automatically to a pointer. */
1617 if (TREE_CODE (val) == NON_LVALUE_EXPR)
1618 val = TREE_OPERAND (val, 0);
1620 if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE
1621 || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE)
1622 val = default_conversion (val);
1624 val = require_complete_type (val);
1628 /* Formal parm type is specified by a function prototype. */
1631 if (TYPE_SIZE (type) == 0)
1633 error ("type of formal parameter %d is incomplete", parmnum + 1);
1638 #if 0 /* This turns out not to win--there's no way to write a prototype
1639 for a function whose arg type is a union with no tag. */
1640 /* Nameless union automatically casts the types it contains. */
1641 if (TREE_CODE (type) == UNION_TYPE && TYPE_NAME (type) == 0)
1645 for (field = TYPE_FIELDS (type); field;
1646 field = TREE_CHAIN (field))
1647 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
1648 TYPE_MAIN_VARIANT (TREE_TYPE (val))))
1652 val = build1 (CONVERT_EXPR, type, val);
1656 /* Optionally warn about conversions that
1657 differ from the default conversions. */
1658 if (warn_conversion)
1660 int formal_prec = TYPE_PRECISION (type);
1662 if (INTEGRAL_TYPE_P (type)
1663 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1664 warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1665 else if (TREE_CODE (type) == COMPLEX_TYPE
1666 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1667 warn_for_assignment ("%s as complex rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1668 else if (TREE_CODE (type) == REAL_TYPE
1669 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1670 warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1);
1671 else if (TREE_CODE (type) == REAL_TYPE
1672 && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE)
1673 warn_for_assignment ("%s as floating rather than complex due to prototype", (char *) 0, name, parmnum + 1);
1674 /* ??? At some point, messages should be written about
1675 conversions between complex types, but that's too messy
1677 else if (TREE_CODE (type) == REAL_TYPE
1678 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1680 /* Warn if any argument is passed as `float',
1681 since without a prototype it would be `double'. */
1682 if (formal_prec == TYPE_PRECISION (float_type_node))
1683 warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1);
1685 /* Detect integer changing in width or signedness. */
1686 else if (INTEGRAL_TYPE_P (type)
1687 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1689 tree would_have_been = default_conversion (val);
1690 tree type1 = TREE_TYPE (would_have_been);
1692 if (TREE_CODE (type) == ENUMERAL_TYPE
1693 && type == TREE_TYPE (val))
1694 /* No warning if function asks for enum
1695 and the actual arg is that enum type. */
1697 else if (formal_prec != TYPE_PRECISION (type1))
1698 warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1);
1699 else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1))
1701 /* Don't complain if the formal parameter type
1702 is an enum, because we can't tell now whether
1703 the value was an enum--even the same enum. */
1704 else if (TREE_CODE (type) == ENUMERAL_TYPE)
1706 else if (TREE_CODE (val) == INTEGER_CST
1707 && int_fits_type_p (val, type))
1708 /* Change in signedness doesn't matter
1709 if a constant value is unaffected. */
1711 /* Likewise for a constant in a NOP_EXPR. */
1712 else if (TREE_CODE (val) == NOP_EXPR
1713 && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST
1714 && int_fits_type_p (TREE_OPERAND (val, 0), type))
1716 #if 0 /* We never get such tree structure here. */
1717 else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE
1718 && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type)
1719 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type))
1720 /* Change in signedness doesn't matter
1721 if an enum value is unaffected. */
1724 /* If the value is extended from a narrower
1725 unsigned type, it doesn't matter whether we
1726 pass it as signed or unsigned; the value
1727 certainly is the same either way. */
1728 else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
1729 && TREE_UNSIGNED (TREE_TYPE (val)))
1731 else if (TREE_UNSIGNED (type))
1732 warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
1734 warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
1738 parmval = convert_for_assignment (type, val,
1739 (char *)0, /* arg passing */
1740 fundecl, name, parmnum + 1);
1742 #ifdef PROMOTE_PROTOTYPES
1743 if ((TREE_CODE (type) == INTEGER_TYPE
1744 || TREE_CODE (type) == ENUMERAL_TYPE)
1745 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
1746 parmval = default_conversion (parmval);
1749 result = tree_cons (NULL_TREE, parmval, result);
1751 else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE
1752 && (TYPE_PRECISION (TREE_TYPE (val))
1753 < TYPE_PRECISION (double_type_node)))
1754 /* Convert `float' to `double'. */
1755 result = tree_cons (NULL_TREE, convert (double_type_node, val), result);
1757 /* Convert `short' and `char' to full-size `int'. */
1758 result = tree_cons (NULL_TREE, default_conversion (val), result);
1761 typetail = TREE_CHAIN (typetail);
1764 if (typetail != 0 && TREE_VALUE (typetail) != void_type_node)
1767 error ("too few arguments to function `%s'",
1768 IDENTIFIER_POINTER (name));
1770 error ("too few arguments to function");
1773 return nreverse (result);
1776 /* This is the entry point used by the parser
1777 for binary operators in the input.
1778 In addition to constructing the expression,
1779 we check for operands that were written with other binary operators
1780 in a way that is likely to confuse the user. */
1783 parser_build_binary_op (code, arg1, arg2)
1784 enum tree_code code;
1787 tree result = build_binary_op (code, arg1, arg2, 1);
1790 char class1 = TREE_CODE_CLASS (TREE_CODE (arg1));
1791 char class2 = TREE_CODE_CLASS (TREE_CODE (arg2));
1792 enum tree_code code1 = ERROR_MARK;
1793 enum tree_code code2 = ERROR_MARK;
1795 if (class1 == 'e' || class1 == '1'
1796 || class1 == '2' || class1 == '<')
1797 code1 = C_EXP_ORIGINAL_CODE (arg1);
1798 if (class2 == 'e' || class2 == '1'
1799 || class2 == '2' || class2 == '<')
1800 code2 = C_EXP_ORIGINAL_CODE (arg2);
1802 /* Check for cases such as x+y<<z which users are likely
1803 to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE
1804 is cleared to prevent these warnings. */
1805 if (warn_parentheses)
1807 if (code == LSHIFT_EXPR || code == RSHIFT_EXPR)
1809 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1810 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1811 warning ("suggest parentheses around + or - inside shift");
1814 if (code == TRUTH_ORIF_EXPR)
1816 if (code1 == TRUTH_ANDIF_EXPR
1817 || code2 == TRUTH_ANDIF_EXPR)
1818 warning ("suggest parentheses around && within ||");
1821 if (code == BIT_IOR_EXPR)
1823 if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR
1824 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1825 || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR
1826 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1827 warning ("suggest parentheses around arithmetic in operand of |");
1830 if (code == BIT_XOR_EXPR)
1832 if (code1 == BIT_AND_EXPR
1833 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1834 || code2 == BIT_AND_EXPR
1835 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1836 warning ("suggest parentheses around arithmetic in operand of ^");
1839 if (code == BIT_AND_EXPR)
1841 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1842 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1843 warning ("suggest parentheses around + or - in operand of &");
1847 /* Similarly, check for cases like 1<=i<=10 that are probably errors. */
1848 if (TREE_CODE_CLASS (code) == '<' && extra_warnings
1849 && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<'))
1850 warning ("comparisons like X<=Y<=Z do not have their mathematical meaning");
1852 unsigned_conversion_warning (result, arg1);
1853 unsigned_conversion_warning (result, arg2);
1854 overflow_warning (result);
1856 class = TREE_CODE_CLASS (TREE_CODE (result));
1858 /* Record the code that was specified in the source,
1859 for the sake of warnings about confusing nesting. */
1860 if (class == 'e' || class == '1'
1861 || class == '2' || class == '<')
1862 C_SET_EXP_ORIGINAL_CODE (result, code);
1865 int flag = TREE_CONSTANT (result);
1866 /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR
1867 so that convert_for_assignment wouldn't strip it.
1868 That way, we got warnings for things like p = (1 - 1).
1869 But it turns out we should not get those warnings. */
1870 result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result);
1871 C_SET_EXP_ORIGINAL_CODE (result, code);
1872 TREE_CONSTANT (result) = flag;
1878 /* Build a binary-operation expression without default conversions.
1879 CODE is the kind of expression to build.
1880 This function differs from `build' in several ways:
1881 the data type of the result is computed and recorded in it,
1882 warnings are generated if arg data types are invalid,
1883 special handling for addition and subtraction of pointers is known,
1884 and some optimization is done (operations on narrow ints
1885 are done in the narrower type when that gives the same result).
1886 Constant folding is also done before the result is returned.
1888 Note that the operands will never have enumeral types, or function
1889 or array types, because either they will have the default conversions
1890 performed or they have both just been converted to some other type in which
1891 the arithmetic is to be done. */
1894 build_binary_op (code, orig_op0, orig_op1, convert_p)
1895 enum tree_code code;
1896 tree orig_op0, orig_op1;
1900 register enum tree_code code0, code1;
1903 /* Expression code to give to the expression when it is built.
1904 Normally this is CODE, which is what the caller asked for,
1905 but in some special cases we change it. */
1906 register enum tree_code resultcode = code;
1908 /* Data type in which the computation is to be performed.
1909 In the simplest cases this is the common type of the arguments. */
1910 register tree result_type = NULL;
1912 /* Nonzero means operands have already been type-converted
1913 in whatever way is necessary.
1914 Zero means they need to be converted to RESULT_TYPE. */
1917 /* Nonzero means after finally constructing the expression
1918 give it this type. Otherwise, give it type RESULT_TYPE. */
1919 tree final_type = 0;
1921 /* Nonzero if this is an operation like MIN or MAX which can
1922 safely be computed in short if both args are promoted shorts.
1923 Also implies COMMON.
1924 -1 indicates a bitwise operation; this makes a difference
1925 in the exact conditions for when it is safe to do the operation
1926 in a narrower mode. */
1929 /* Nonzero if this is a comparison operation;
1930 if both args are promoted shorts, compare the original shorts.
1931 Also implies COMMON. */
1932 int short_compare = 0;
1934 /* Nonzero if this is a right-shift operation, which can be computed on the
1935 original short and then promoted if the operand is a promoted short. */
1936 int short_shift = 0;
1938 /* Nonzero means set RESULT_TYPE to the common type of the args. */
1943 op0 = default_conversion (orig_op0);
1944 op1 = default_conversion (orig_op1);
1952 type0 = TREE_TYPE (op0);
1953 type1 = TREE_TYPE (op1);
1955 /* The expression codes of the data types of the arguments tell us
1956 whether the arguments are integers, floating, pointers, etc. */
1957 code0 = TREE_CODE (type0);
1958 code1 = TREE_CODE (type1);
1960 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1961 STRIP_TYPE_NOPS (op0);
1962 STRIP_TYPE_NOPS (op1);
1964 /* If an error was already reported for one of the arguments,
1965 avoid reporting another error. */
1967 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
1968 return error_mark_node;
1973 /* Handle the pointer + int case. */
1974 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
1975 return pointer_int_sum (PLUS_EXPR, op0, op1);
1976 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
1977 return pointer_int_sum (PLUS_EXPR, op1, op0);
1983 /* Subtraction of two similar pointers.
1984 We must subtract them as integers, then divide by object size. */
1985 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
1986 && comp_target_types (type0, type1))
1987 return pointer_diff (op0, op1);
1988 /* Handle pointer minus int. Just like pointer plus int. */
1989 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
1990 return pointer_int_sum (MINUS_EXPR, op0, op1);
1999 case TRUNC_DIV_EXPR:
2001 case FLOOR_DIV_EXPR:
2002 case ROUND_DIV_EXPR:
2003 case EXACT_DIV_EXPR:
2004 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2005 || code0 == COMPLEX_TYPE)
2006 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2007 || code1 == COMPLEX_TYPE))
2009 if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
2010 resultcode = RDIV_EXPR;
2013 /* Although it would be tempting to shorten always here, that
2014 loses on some targets, since the modulo instruction is
2015 undefined if the quotient can't be represented in the
2016 computation mode. We shorten only if unsigned or if
2017 dividing by something we know != -1. */
2018 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2019 || (TREE_CODE (op1) == INTEGER_CST
2020 && (TREE_INT_CST_LOW (op1) != -1
2021 || TREE_INT_CST_HIGH (op1) != -1)));
2028 case BIT_ANDTC_EXPR:
2031 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2033 /* If one operand is a constant, and the other is a short type
2034 that has been converted to an int,
2035 really do the work in the short type and then convert the
2036 result to int. If we are lucky, the constant will be 0 or 1
2037 in the short type, making the entire operation go away. */
2038 if (TREE_CODE (op0) == INTEGER_CST
2039 && TREE_CODE (op1) == NOP_EXPR
2040 && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0)))
2041 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0))))
2043 final_type = result_type;
2044 op1 = TREE_OPERAND (op1, 0);
2045 result_type = TREE_TYPE (op1);
2047 if (TREE_CODE (op1) == INTEGER_CST
2048 && TREE_CODE (op0) == NOP_EXPR
2049 && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))
2050 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0))))
2052 final_type = result_type;
2053 op0 = TREE_OPERAND (op0, 0);
2054 result_type = TREE_TYPE (op0);
2058 case TRUNC_MOD_EXPR:
2059 case FLOOR_MOD_EXPR:
2060 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2062 /* Although it would be tempting to shorten always here, that loses
2063 on some targets, since the modulo instruction is undefined if the
2064 quotient can't be represented in the computation mode. We shorten
2065 only if unsigned or if dividing by something we know != -1. */
2066 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2067 || (TREE_CODE (op1) == INTEGER_CST
2068 && (TREE_INT_CST_LOW (op1) != -1
2069 || TREE_INT_CST_HIGH (op1) != -1)));
2074 case TRUTH_ANDIF_EXPR:
2075 case TRUTH_ORIF_EXPR:
2076 case TRUTH_AND_EXPR:
2078 case TRUTH_XOR_EXPR:
2079 if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
2080 || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2081 && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
2082 || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2084 /* Result of these operations is always an int,
2085 but that does not mean the operands should be
2086 converted to ints! */
2087 result_type = integer_type_node;
2088 op0 = truthvalue_conversion (op0);
2089 op1 = truthvalue_conversion (op1);
2094 /* Shift operations: result has same type as first operand;
2095 always convert second operand to int.
2096 Also set SHORT_SHIFT if shifting rightward. */
2099 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2101 if (TREE_CODE (op1) == INTEGER_CST)
2103 if (tree_int_cst_sgn (op1) < 0)
2104 warning ("right shift count is negative");
2107 if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1))
2109 if (TREE_INT_CST_HIGH (op1) != 0
2110 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2111 >= TYPE_PRECISION (type0)))
2112 warning ("right shift count >= width of type");
2115 /* Use the type of the value to be shifted.
2116 This is what most traditional C compilers do. */
2117 result_type = type0;
2118 /* Unless traditional, convert the shift-count to an integer,
2119 regardless of size of value being shifted. */
2120 if (! flag_traditional)
2122 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2123 op1 = convert (integer_type_node, op1);
2124 /* Avoid converting op1 to result_type later. */
2131 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2133 if (TREE_CODE (op1) == INTEGER_CST)
2135 if (tree_int_cst_sgn (op1) < 0)
2136 warning ("left shift count is negative");
2137 else if (TREE_INT_CST_HIGH (op1) != 0
2138 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2139 >= TYPE_PRECISION (type0)))
2140 warning ("left shift count >= width of type");
2142 /* Use the type of the value to be shifted.
2143 This is what most traditional C compilers do. */
2144 result_type = type0;
2145 /* Unless traditional, convert the shift-count to an integer,
2146 regardless of size of value being shifted. */
2147 if (! flag_traditional)
2149 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2150 op1 = convert (integer_type_node, op1);
2151 /* Avoid converting op1 to result_type later. */
2159 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2161 if (TREE_CODE (op1) == INTEGER_CST)
2163 if (tree_int_cst_sgn (op1) < 0)
2164 warning ("shift count is negative");
2165 else if (TREE_INT_CST_HIGH (op1) != 0
2166 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2167 >= TYPE_PRECISION (type0)))
2168 warning ("shift count >= width of type");
2170 /* Use the type of the value to be shifted.
2171 This is what most traditional C compilers do. */
2172 result_type = type0;
2173 /* Unless traditional, convert the shift-count to an integer,
2174 regardless of size of value being shifted. */
2175 if (! flag_traditional)
2177 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2178 op1 = convert (integer_type_node, op1);
2179 /* Avoid converting op1 to result_type later. */
2187 /* Result of comparison is always int,
2188 but don't convert the args to int! */
2189 result_type = integer_type_node;
2191 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2192 || code0 == COMPLEX_TYPE)
2193 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2194 || code1 == COMPLEX_TYPE))
2196 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2198 register tree tt0 = TREE_TYPE (type0);
2199 register tree tt1 = TREE_TYPE (type1);
2200 /* Anything compares with void *. void * compares with anything.
2201 Otherwise, the targets must be compatible
2202 and both must be object or both incomplete. */
2203 if (comp_target_types (type0, type1))
2205 else if (TYPE_MAIN_VARIANT (tt0) == void_type_node)
2207 /* op0 != orig_op0 detects the case of something
2208 whose value is 0 but which isn't a valid null ptr const. */
2209 if (pedantic && (!integer_zerop (op0) || op0 != orig_op0)
2210 && TREE_CODE (tt1) == FUNCTION_TYPE)
2211 pedwarn ("ANSI C forbids comparison of `void *' with function pointer");
2213 else if (TYPE_MAIN_VARIANT (tt1) == void_type_node)
2215 if (pedantic && (!integer_zerop (op1) || op1 != orig_op1)
2216 && TREE_CODE (tt0) == FUNCTION_TYPE)
2217 pedwarn ("ANSI C forbids comparison of `void *' with function pointer");
2220 pedwarn ("comparison of distinct pointer types lacks a cast");
2222 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2223 && integer_zerop (op1))
2224 op1 = null_pointer_node;
2225 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2226 && integer_zerop (op0))
2227 op0 = null_pointer_node;
2228 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2230 if (! flag_traditional)
2231 pedwarn ("comparison between pointer and integer");
2232 op1 = convert (TREE_TYPE (op0), op1);
2234 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2236 if (! flag_traditional)
2237 pedwarn ("comparison between pointer and integer");
2238 op0 = convert (TREE_TYPE (op1), op0);
2241 /* If args are not valid, clear out RESULT_TYPE
2242 to cause an error message later. */
2248 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2249 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2251 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2253 if (! comp_target_types (type0, type1))
2254 pedwarn ("comparison of distinct pointer types lacks a cast");
2256 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2257 pedwarn ("ANSI C forbids ordered comparisons of pointers to functions");
2258 result_type = common_type (type0, type1);
2266 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2267 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2269 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2271 if (! comp_target_types (type0, type1))
2272 pedwarn ("comparison of distinct pointer types lacks a cast");
2273 else if ((TYPE_SIZE (TREE_TYPE (type0)) != 0)
2274 != (TYPE_SIZE (TREE_TYPE (type1)) != 0))
2275 pedwarn ("comparison of complete and incomplete pointers");
2277 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2278 pedwarn ("ANSI C forbids ordered comparisons of pointers to functions");
2279 result_type = integer_type_node;
2281 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2282 && integer_zerop (op1))
2284 result_type = integer_type_node;
2285 op1 = null_pointer_node;
2287 pedwarn ("ordered comparison of pointer with integer zero");
2289 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2290 && integer_zerop (op0))
2292 result_type = integer_type_node;
2293 op0 = null_pointer_node;
2295 pedwarn ("ordered comparison of pointer with integer zero");
2297 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2299 result_type = integer_type_node;
2300 if (! flag_traditional)
2301 pedwarn ("comparison between pointer and integer");
2302 op1 = convert (TREE_TYPE (op0), op1);
2304 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2306 result_type = integer_type_node;
2307 if (! flag_traditional)
2308 pedwarn ("comparison between pointer and integer");
2309 op0 = convert (TREE_TYPE (op1), op0);
2315 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2317 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2319 int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
2321 if (shorten || common || short_compare)
2322 result_type = common_type (type0, type1);
2324 /* For certain operations (which identify themselves by shorten != 0)
2325 if both args were extended from the same smaller type,
2326 do the arithmetic in that type and then extend.
2328 shorten !=0 and !=1 indicates a bitwise operation.
2329 For them, this optimization is safe only if
2330 both args are zero-extended or both are sign-extended.
2331 Otherwise, we might change the result.
2332 Eg, (short)-1 | (unsigned short)-1 is (int)-1
2333 but calculated in (unsigned short) it would be (unsigned short)-1. */
2335 if (shorten && none_complex)
2337 int unsigned0, unsigned1;
2338 tree arg0 = get_narrower (op0, &unsigned0);
2339 tree arg1 = get_narrower (op1, &unsigned1);
2340 /* UNS is 1 if the operation to be done is an unsigned one. */
2341 int uns = TREE_UNSIGNED (result_type);
2344 final_type = result_type;
2346 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
2347 but it *requires* conversion to FINAL_TYPE. */
2349 if ((TYPE_PRECISION (TREE_TYPE (op0))
2350 == TYPE_PRECISION (TREE_TYPE (arg0)))
2351 && TREE_TYPE (op0) != final_type)
2352 unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0));
2353 if ((TYPE_PRECISION (TREE_TYPE (op1))
2354 == TYPE_PRECISION (TREE_TYPE (arg1)))
2355 && TREE_TYPE (op1) != final_type)
2356 unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1));
2358 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
2360 /* For bitwise operations, signedness of nominal type
2361 does not matter. Consider only how operands were extended. */
2365 /* Note that in all three cases below we refrain from optimizing
2366 an unsigned operation on sign-extended args.
2367 That would not be valid. */
2369 /* Both args variable: if both extended in same way
2370 from same width, do it in that width.
2371 Do it unsigned if args were zero-extended. */
2372 if ((TYPE_PRECISION (TREE_TYPE (arg0))
2373 < TYPE_PRECISION (result_type))
2374 && (TYPE_PRECISION (TREE_TYPE (arg1))
2375 == TYPE_PRECISION (TREE_TYPE (arg0)))
2376 && unsigned0 == unsigned1
2377 && (unsigned0 || !uns))
2379 = signed_or_unsigned_type (unsigned0,
2380 common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
2381 else if (TREE_CODE (arg0) == INTEGER_CST
2382 && (unsigned1 || !uns)
2383 && (TYPE_PRECISION (TREE_TYPE (arg1))
2384 < TYPE_PRECISION (result_type))
2385 && (type = signed_or_unsigned_type (unsigned1,
2387 int_fits_type_p (arg0, type)))
2389 else if (TREE_CODE (arg1) == INTEGER_CST
2390 && (unsigned0 || !uns)
2391 && (TYPE_PRECISION (TREE_TYPE (arg0))
2392 < TYPE_PRECISION (result_type))
2393 && (type = signed_or_unsigned_type (unsigned0,
2395 int_fits_type_p (arg1, type)))
2399 /* Shifts can be shortened if shifting right. */
2404 tree arg0 = get_narrower (op0, &unsigned_arg);
2406 final_type = result_type;
2408 if (arg0 == op0 && final_type == TREE_TYPE (op0))
2409 unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0));
2411 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
2412 /* If arg is sign-extended and then unsigned-shifted,
2413 we can simulate this with a signed shift in arg's type
2414 only if the extended result is at least twice as wide
2415 as the arg. Otherwise, the shift could use up all the
2416 ones made by sign-extension and bring in zeros.
2417 We can't optimize that case at all, but in most machines
2418 it never happens because available widths are 2**N. */
2419 && (!TREE_UNSIGNED (final_type)
2421 || 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type)))
2423 /* Do an unsigned shift if the operand was zero-extended. */
2425 = signed_or_unsigned_type (unsigned_arg,
2427 /* Convert value-to-be-shifted to that type. */
2428 if (TREE_TYPE (op0) != result_type)
2429 op0 = convert (result_type, op0);
2434 /* Comparison operations are shortened too but differently.
2435 They identify themselves by setting short_compare = 1. */
2439 /* Don't write &op0, etc., because that would prevent op0
2440 from being kept in a register.
2441 Instead, make copies of the our local variables and
2442 pass the copies by reference, then copy them back afterward. */
2443 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
2444 enum tree_code xresultcode = resultcode;
2446 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
2449 op0 = xop0, op1 = xop1, result_type = xresult_type;
2450 resultcode = xresultcode;
2454 tree op0_type = TREE_TYPE (orig_op0);
2455 tree op1_type = TREE_TYPE (orig_op1);
2456 int op0_unsigned = TREE_UNSIGNED (op0_type);
2457 int op1_unsigned = TREE_UNSIGNED (op1_type);
2459 /* Give warnings for comparisons between signed and unsigned
2460 quantities that will fail. Do not warn if the signed quantity
2461 is an unsuffixed integer literal (or some static constant
2462 expression involving such literals) and it is positive.
2463 Do not warn if the width of the unsigned quantity is less
2464 than that of the signed quantity, since in this case all
2465 values of the unsigned quantity fit in the signed quantity.
2466 Do not warn if the signed type is the same size as the
2467 result_type since sign extension does not cause trouble in
2469 /* Do the checking based on the original operand trees, so that
2470 casts will be considered, but default promotions won't be. */
2471 if (op0_unsigned != op1_unsigned
2473 && TYPE_PRECISION (op0_type) >= TYPE_PRECISION (op1_type)
2474 && TYPE_PRECISION (op0_type) < TYPE_PRECISION (result_type)
2475 && (TREE_CODE (op1) != INTEGER_CST
2476 || (TREE_CODE (op1) == INTEGER_CST
2477 && INT_CST_LT (op1, integer_zero_node))))
2480 && TYPE_PRECISION (op1_type) >= TYPE_PRECISION (op0_type)
2481 && TYPE_PRECISION (op1_type) < TYPE_PRECISION (result_type)
2482 && (TREE_CODE (op0) != INTEGER_CST
2483 || (TREE_CODE (op0) == INTEGER_CST
2484 && INT_CST_LT (op0, integer_zero_node))))))
2485 warning ("comparison between signed and unsigned");
2490 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
2491 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
2492 Then the expression will be built.
2493 It will be given type FINAL_TYPE if that is nonzero;
2494 otherwise, it will be given type RESULT_TYPE. */
2498 binary_op_error (code);
2499 return error_mark_node;
2504 if (TREE_TYPE (op0) != result_type)
2505 op0 = convert (result_type, op0);
2506 if (TREE_TYPE (op1) != result_type)
2507 op1 = convert (result_type, op1);
2511 register tree result = build (resultcode, result_type, op0, op1);
2512 register tree folded;
2514 folded = fold (result);
2515 if (folded == result)
2516 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2517 if (final_type != 0)
2518 return convert (final_type, folded);
2523 /* Return a tree for the sum or difference (RESULTCODE says which)
2524 of pointer PTROP and integer INTOP. */
2527 pointer_int_sum (resultcode, ptrop, intop)
2528 enum tree_code resultcode;
2529 register tree ptrop, intop;
2533 register tree result;
2534 register tree folded;
2536 /* The result is a pointer of the same type that is being added. */
2538 register tree result_type = TREE_TYPE (ptrop);
2540 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
2542 if (pedantic || warn_pointer_arith)
2543 pedwarn ("pointer of type `void *' used in arithmetic");
2544 size_exp = integer_one_node;
2546 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
2548 if (pedantic || warn_pointer_arith)
2549 pedwarn ("pointer to a function used in arithmetic");
2550 size_exp = integer_one_node;
2553 size_exp = c_size_in_bytes (TREE_TYPE (result_type));
2555 /* If what we are about to multiply by the size of the elements
2556 contains a constant term, apply distributive law
2557 and multiply that constant term separately.
2558 This helps produce common subexpressions. */
2560 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
2561 && ! TREE_CONSTANT (intop)
2562 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
2563 && TREE_CONSTANT (size_exp)
2564 /* If the constant comes from pointer subtraction,
2565 skip this optimization--it would cause an error. */
2566 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE)
2568 enum tree_code subcode = resultcode;
2569 tree int_type = TREE_TYPE (intop);
2570 if (TREE_CODE (intop) == MINUS_EXPR)
2571 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
2572 /* Convert both subexpression types to the type of intop,
2573 because weird cases involving pointer arithmetic
2574 can result in a sum or difference with different type args. */
2575 ptrop = build_binary_op (subcode, ptrop,
2576 convert (int_type, TREE_OPERAND (intop, 1)), 1);
2577 intop = convert (int_type, TREE_OPERAND (intop, 0));
2580 /* Convert the integer argument to a type the same size as a pointer
2581 so the multiply won't overflow spuriously. */
2583 if (TYPE_PRECISION (TREE_TYPE (intop)) != POINTER_SIZE)
2584 intop = convert (type_for_size (POINTER_SIZE, 0), intop);
2586 /* Replace the integer argument with a suitable product by the object size.
2587 Do this multiplication as signed, then convert to the appropriate
2588 pointer type (actually unsigned integral). */
2590 intop = convert (result_type,
2591 build_binary_op (MULT_EXPR, intop,
2592 convert (TREE_TYPE (intop), size_exp), 1));
2594 /* Create the sum or difference. */
2596 result = build (resultcode, result_type, ptrop, intop);
2598 folded = fold (result);
2599 if (folded == result)
2600 TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop);
2604 /* Return a tree for the difference of pointers OP0 and OP1.
2605 The resulting tree has type int. */
2608 pointer_diff (op0, op1)
2609 register tree op0, op1;
2611 register tree result, folded;
2612 tree restype = ptrdiff_type_node;
2614 tree target_type = TREE_TYPE (TREE_TYPE (op0));
2616 if (pedantic || warn_pointer_arith)
2618 if (TREE_CODE (target_type) == VOID_TYPE)
2619 pedwarn ("pointer of type `void *' used in subtraction");
2620 if (TREE_CODE (target_type) == FUNCTION_TYPE)
2621 pedwarn ("pointer to a function used in subtraction");
2624 /* First do the subtraction as integers;
2625 then drop through to build the divide operator. */
2627 op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
2628 convert (restype, op1), 1);
2629 /* This generates an error if op1 is pointer to incomplete type. */
2630 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0)
2631 error ("arithmetic on pointer to an incomplete type");
2633 /* This generates an error if op0 is pointer to incomplete type. */
2634 op1 = c_size_in_bytes (target_type);
2636 /* Divide by the size, in easiest possible way. */
2638 result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
2640 folded = fold (result);
2641 if (folded == result)
2642 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2646 /* Construct and perhaps optimize a tree representation
2647 for a unary operation. CODE, a tree_code, specifies the operation
2648 and XARG is the operand. NOCONVERT nonzero suppresses
2649 the default promotions (such as from short to int). */
2652 build_unary_op (code, xarg, noconvert)
2653 enum tree_code code;
2657 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
2658 register tree arg = xarg;
2659 register tree argtype = 0;
2660 register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
2661 char *errstring = NULL;
2664 if (typecode == ERROR_MARK)
2665 return error_mark_node;
2666 if (typecode == ENUMERAL_TYPE)
2667 typecode = INTEGER_TYPE;
2672 /* This is used for unary plus, because a CONVERT_EXPR
2673 is enough to prevent anybody from looking inside for
2674 associativity, but won't generate any code. */
2675 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2676 || typecode == COMPLEX_TYPE))
2677 errstring = "wrong type argument to unary plus";
2678 else if (!noconvert)
2679 arg = default_conversion (arg);
2683 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2684 || typecode == COMPLEX_TYPE))
2685 errstring = "wrong type argument to unary minus";
2686 else if (!noconvert)
2687 arg = default_conversion (arg);
2691 if (typecode == COMPLEX_TYPE)
2695 arg = default_conversion (arg);
2697 else if (typecode != INTEGER_TYPE)
2698 errstring = "wrong type argument to bit-complement";
2699 else if (!noconvert)
2700 arg = default_conversion (arg);
2704 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2705 || typecode == COMPLEX_TYPE))
2706 errstring = "wrong type argument to abs";
2707 else if (!noconvert)
2708 arg = default_conversion (arg);
2712 /* Conjugating a real value is a no-op, but allow it anyway. */
2713 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2714 || typecode == COMPLEX_TYPE))
2715 errstring = "wrong type argument to conjugation";
2716 else if (!noconvert)
2717 arg = default_conversion (arg);
2720 case TRUTH_NOT_EXPR:
2721 if (typecode != INTEGER_TYPE
2722 && typecode != REAL_TYPE && typecode != POINTER_TYPE
2723 && typecode != COMPLEX_TYPE
2724 /* These will convert to a pointer. */
2725 && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE)
2727 errstring = "wrong type argument to unary exclamation mark";
2730 arg = truthvalue_conversion (arg);
2731 return invert_truthvalue (arg);
2737 if (TREE_CODE (arg) == COMPLEX_CST)
2738 return TREE_REALPART (arg);
2739 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2740 return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2745 if (TREE_CODE (arg) == COMPLEX_CST)
2746 return TREE_IMAGPART (arg);
2747 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2748 return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2750 return convert (TREE_TYPE (arg), integer_zero_node);
2752 case PREINCREMENT_EXPR:
2753 case POSTINCREMENT_EXPR:
2754 case PREDECREMENT_EXPR:
2755 case POSTDECREMENT_EXPR:
2756 /* Handle complex lvalues (when permitted)
2757 by reduction to simpler cases. */
2759 val = unary_complex_lvalue (code, arg);
2763 /* Increment or decrement the real part of the value,
2764 and don't change the imaginary part. */
2765 if (typecode == COMPLEX_TYPE)
2769 arg = stabilize_reference (arg);
2770 real = build_unary_op (REALPART_EXPR, arg, 1);
2771 imag = build_unary_op (IMAGPART_EXPR, arg, 1);
2772 return build (COMPLEX_EXPR, TREE_TYPE (arg),
2773 build_unary_op (code, real, 1), imag);
2776 /* Report invalid types. */
2778 if (typecode != POINTER_TYPE
2779 && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
2781 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
2782 errstring ="wrong type argument to increment";
2784 errstring ="wrong type argument to decrement";
2790 tree result_type = TREE_TYPE (arg);
2792 arg = get_unwidened (arg, 0);
2793 argtype = TREE_TYPE (arg);
2795 /* Compute the increment. */
2797 if (typecode == POINTER_TYPE)
2799 /* If pointer target is an undefined struct,
2800 we just cannot know how to do the arithmetic. */
2801 if (TYPE_SIZE (TREE_TYPE (result_type)) == 0)
2802 error ("%s of pointer to unknown structure",
2803 ((code == PREINCREMENT_EXPR
2804 || code == POSTINCREMENT_EXPR)
2805 ? "increment" : "decrement"));
2806 else if ((pedantic || warn_pointer_arith)
2807 && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
2808 || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
2809 pedwarn ("wrong type argument to %s",
2810 ((code == PREINCREMENT_EXPR
2811 || code == POSTINCREMENT_EXPR)
2812 ? "increment" : "decrement"));
2813 inc = c_size_in_bytes (TREE_TYPE (result_type));
2816 inc = integer_one_node;
2818 inc = convert (argtype, inc);
2820 /* Handle incrementing a cast-expression. */
2823 switch (TREE_CODE (arg))
2828 case FIX_TRUNC_EXPR:
2829 case FIX_FLOOR_EXPR:
2830 case FIX_ROUND_EXPR:
2832 pedantic_lvalue_warning (CONVERT_EXPR);
2833 /* If the real type has the same machine representation
2834 as the type it is cast to, we can make better output
2835 by adding directly to the inside of the cast. */
2836 if ((TREE_CODE (TREE_TYPE (arg))
2837 == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))))
2838 && (TYPE_MODE (TREE_TYPE (arg))
2839 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0)))))
2840 arg = TREE_OPERAND (arg, 0);
2843 tree incremented, modify, value;
2844 arg = stabilize_reference (arg);
2845 if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR)
2848 value = save_expr (arg);
2849 incremented = build (((code == PREINCREMENT_EXPR
2850 || code == POSTINCREMENT_EXPR)
2851 ? PLUS_EXPR : MINUS_EXPR),
2852 argtype, value, inc);
2853 TREE_SIDE_EFFECTS (incremented) = 1;
2854 modify = build_modify_expr (arg, NOP_EXPR, incremented);
2855 value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value);
2856 TREE_USED (value) = 1;
2866 /* Complain about anything else that is not a true lvalue. */
2867 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
2868 || code == POSTINCREMENT_EXPR)
2869 ? "increment" : "decrement")))
2870 return error_mark_node;
2872 /* Report a read-only lvalue. */
2873 if (TREE_READONLY (arg))
2874 readonly_warning (arg,
2875 ((code == PREINCREMENT_EXPR
2876 || code == POSTINCREMENT_EXPR)
2877 ? "increment" : "decrement"));
2879 val = build (code, TREE_TYPE (arg), arg, inc);
2880 TREE_SIDE_EFFECTS (val) = 1;
2881 val = convert (result_type, val);
2882 if (TREE_CODE (val) != code)
2883 TREE_NO_UNUSED_WARNING (val) = 1;
2888 /* Note that this operation never does default_conversion
2889 regardless of NOCONVERT. */
2891 /* Let &* cancel out to simplify resulting code. */
2892 if (TREE_CODE (arg) == INDIRECT_REF)
2894 /* Don't let this be an lvalue. */
2895 if (lvalue_p (TREE_OPERAND (arg, 0)))
2896 return non_lvalue (TREE_OPERAND (arg, 0));
2897 return TREE_OPERAND (arg, 0);
2900 /* For &x[y], return x+y */
2901 if (TREE_CODE (arg) == ARRAY_REF)
2903 if (mark_addressable (TREE_OPERAND (arg, 0)) == 0)
2904 return error_mark_node;
2905 return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
2906 TREE_OPERAND (arg, 1), 1);
2909 /* Handle complex lvalues (when permitted)
2910 by reduction to simpler cases. */
2911 val = unary_complex_lvalue (code, arg);
2915 #if 0 /* Turned off because inconsistent;
2916 float f; *&(int)f = 3.4 stores in int format
2917 whereas (int)f = 3.4 stores in float format. */
2918 /* Address of a cast is just a cast of the address
2919 of the operand of the cast. */
2920 switch (TREE_CODE (arg))
2925 case FIX_TRUNC_EXPR:
2926 case FIX_FLOOR_EXPR:
2927 case FIX_ROUND_EXPR:
2930 pedwarn ("ANSI C forbids the address of a cast expression");
2931 return convert (build_pointer_type (TREE_TYPE (arg)),
2932 build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0),
2937 /* Allow the address of a constructor if all the elements
2939 if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg))
2941 /* Anything not already handled and not a true memory reference
2943 else if (typecode != FUNCTION_TYPE && !lvalue_or_else (arg, "unary `&'"))
2944 return error_mark_node;
2946 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
2947 argtype = TREE_TYPE (arg);
2948 /* If the lvalue is const or volatile,
2949 merge that into the type that the address will point to. */
2950 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd'
2951 || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r')
2953 if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg))
2954 argtype = c_build_type_variant (argtype,
2955 TREE_READONLY (arg),
2956 TREE_THIS_VOLATILE (arg));
2959 argtype = build_pointer_type (argtype);
2961 if (mark_addressable (arg) == 0)
2962 return error_mark_node;
2967 if (TREE_CODE (arg) == COMPONENT_REF)
2969 tree field = TREE_OPERAND (arg, 1);
2971 addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0);
2973 if (DECL_BIT_FIELD (field))
2975 error ("attempt to take address of bit-field structure member `%s'",
2976 IDENTIFIER_POINTER (DECL_NAME (field)));
2977 return error_mark_node;
2980 addr = convert (argtype, addr);
2982 if (! integer_zerop (DECL_FIELD_BITPOS (field)))
2985 = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field),
2986 size_int (BITS_PER_UNIT));
2987 int flag = TREE_CONSTANT (addr);
2988 addr = fold (build (PLUS_EXPR, argtype,
2989 addr, convert (argtype, offset)));
2990 TREE_CONSTANT (addr) = flag;
2994 addr = build1 (code, argtype, arg);
2996 /* Address of a static or external variable or
2997 file-scope function counts as a constant. */
2999 && ! (TREE_CODE (arg) == FUNCTION_DECL
3000 && DECL_CONTEXT (arg) != 0))
3001 TREE_CONSTANT (addr) = 1;
3009 argtype = TREE_TYPE (arg);
3010 return fold (build1 (code, argtype, arg));
3014 return error_mark_node;
3018 /* If CONVERSIONS is a conversion expression or a nested sequence of such,
3019 convert ARG with the same conversions in the same order
3020 and return the result. */
3023 convert_sequence (conversions, arg)
3027 switch (TREE_CODE (conversions))
3032 case FIX_TRUNC_EXPR:
3033 case FIX_FLOOR_EXPR:
3034 case FIX_ROUND_EXPR:
3036 return convert (TREE_TYPE (conversions),
3037 convert_sequence (TREE_OPERAND (conversions, 0),
3046 /* Return nonzero if REF is an lvalue valid for this language.
3047 Lvalues can be assigned, unless their type has TYPE_READONLY.
3048 Lvalues can have their address taken, unless they have DECL_REGISTER. */
3054 register enum tree_code code = TREE_CODE (ref);
3061 return lvalue_p (TREE_OPERAND (ref, 0));
3072 if (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
3073 && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE)
3080 /* Return nonzero if REF is an lvalue valid for this language;
3081 otherwise, print an error message and return zero. */
3084 lvalue_or_else (ref, string)
3088 int win = lvalue_p (ref);
3090 error ("invalid lvalue in %s", string);
3094 /* Apply unary lvalue-demanding operator CODE to the expression ARG
3095 for certain kinds of expressions which are not really lvalues
3096 but which we can accept as lvalues.
3098 If ARG is not a kind of expression we can handle, return zero. */
3101 unary_complex_lvalue (code, arg)
3102 enum tree_code code;
3105 /* Handle (a, b) used as an "lvalue". */
3106 if (TREE_CODE (arg) == COMPOUND_EXPR)
3108 tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0);
3109 pedantic_lvalue_warning (COMPOUND_EXPR);
3110 return build (COMPOUND_EXPR, TREE_TYPE (real_result),
3111 TREE_OPERAND (arg, 0), real_result);
3114 /* Handle (a ? b : c) used as an "lvalue". */
3115 if (TREE_CODE (arg) == COND_EXPR)
3117 pedantic_lvalue_warning (COND_EXPR);
3118 return (build_conditional_expr
3119 (TREE_OPERAND (arg, 0),
3120 build_unary_op (code, TREE_OPERAND (arg, 1), 0),
3121 build_unary_op (code, TREE_OPERAND (arg, 2), 0)));
3127 /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR
3128 COMPOUND_EXPR, or CONVERT_EXPR (for casts). */
3131 pedantic_lvalue_warning (code)
3132 enum tree_code code;
3135 pedwarn ("ANSI C forbids use of %s expressions as lvalues",
3136 code == COND_EXPR ? "conditional"
3137 : code == COMPOUND_EXPR ? "compound" : "cast");
3140 /* Warn about storing in something that is `const'. */
3143 readonly_warning (arg, string)
3148 strcpy (buf, string);
3150 /* Forbid assignments to iterators. */
3151 if (TREE_CODE (arg) == VAR_DECL && ITERATOR_P (arg))
3153 strcat (buf, " of iterator `%s'");
3154 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg)));
3157 if (TREE_CODE (arg) == COMPONENT_REF)
3159 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
3160 readonly_warning (TREE_OPERAND (arg, 0), string);
3163 strcat (buf, " of read-only member `%s'");
3164 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1))));
3167 else if (TREE_CODE (arg) == VAR_DECL)
3169 strcat (buf, " of read-only variable `%s'");
3170 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg)));
3174 pedwarn ("%s of read-only location", buf);
3178 /* Mark EXP saying that we need to be able to take the
3179 address of it; it should not be allocated in a register.
3180 Value is 1 if successful. */
3183 mark_addressable (exp)
3186 register tree x = exp;
3188 switch (TREE_CODE (x))
3195 x = TREE_OPERAND (x, 0);
3199 TREE_ADDRESSABLE (x) = 1;
3206 if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)
3207 && DECL_NONLOCAL (x))
3209 if (TREE_PUBLIC (x))
3211 error ("global register variable `%s' used in nested function",
3212 IDENTIFIER_POINTER (DECL_NAME (x)));
3215 pedwarn ("register variable `%s' used in nested function",
3216 IDENTIFIER_POINTER (DECL_NAME (x)));
3218 else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x))
3220 if (TREE_PUBLIC (x))
3222 error ("address of global register variable `%s' requested",
3223 IDENTIFIER_POINTER (DECL_NAME (x)));
3227 /* If we are making this addressable due to its having
3228 volatile components, give a different error message. Also
3229 handle the case of an unnamed parameter by not trying
3230 to give the name. */
3232 else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x)))
3234 error ("cannot put object with volatile field into register");
3238 pedwarn ("address of register variable `%s' requested",
3239 IDENTIFIER_POINTER (DECL_NAME (x)));
3241 put_var_into_stack (x);
3245 TREE_ADDRESSABLE (x) = 1;
3246 #if 0 /* poplevel deals with this now. */
3247 if (DECL_CONTEXT (x) == 0)
3248 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1;
3256 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
3259 build_conditional_expr (ifexp, op1, op2)
3260 tree ifexp, op1, op2;
3262 register tree type1;
3263 register tree type2;
3264 register enum tree_code code1;
3265 register enum tree_code code2;
3266 register tree result_type = NULL;
3267 tree orig_op1 = op1, orig_op2 = op2;
3269 /* If second operand is omitted, it is the same as the first one;
3270 make sure it is calculated only once. */
3274 pedwarn ("ANSI C forbids omitting the middle term of a ?: expression");
3275 ifexp = op1 = save_expr (ifexp);
3278 ifexp = truthvalue_conversion (default_conversion (ifexp));
3280 #if 0 /* Produces wrong result if within sizeof. */
3281 /* Don't promote the operands separately if they promote
3282 the same way. Return the unpromoted type and let the combined
3283 value get promoted if necessary. */
3285 if (TREE_TYPE (op1) == TREE_TYPE (op2)
3286 && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE
3287 && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE
3288 && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE)
3290 if (TREE_CODE (ifexp) == INTEGER_CST)
3291 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3293 return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2));
3297 /* Promote both alternatives. */
3299 if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
3300 op1 = default_conversion (op1);
3301 if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
3302 op2 = default_conversion (op2);
3304 if (TREE_CODE (ifexp) == ERROR_MARK
3305 || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
3306 || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
3307 return error_mark_node;
3309 type1 = TREE_TYPE (op1);
3310 code1 = TREE_CODE (type1);
3311 type2 = TREE_TYPE (op2);
3312 code2 = TREE_CODE (type2);
3314 /* Quickly detect the usual case where op1 and op2 have the same type
3316 if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
3319 result_type = type1;
3321 result_type = TYPE_MAIN_VARIANT (type1);
3323 else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE)
3324 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE))
3326 result_type = common_type (type1, type2);
3328 else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
3330 if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
3331 pedwarn ("ANSI C forbids conditional expr with only one void side");
3332 result_type = void_type_node;
3334 else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
3336 if (comp_target_types (type1, type2))
3337 result_type = common_type (type1, type2);
3338 else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node
3339 && TREE_CODE (orig_op1) != NOP_EXPR)
3340 result_type = qualify_type (type2, type1);
3341 else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node
3342 && TREE_CODE (orig_op2) != NOP_EXPR)
3343 result_type = qualify_type (type1, type2);
3344 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node)
3346 if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
3347 pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer");
3348 result_type = qualify_type (type1, type2);
3350 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node)
3352 if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
3353 pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer");
3354 result_type = qualify_type (type2, type1);
3358 pedwarn ("pointer type mismatch in conditional expression");
3359 result_type = build_pointer_type (void_type_node);
3362 else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
3364 if (! integer_zerop (op2))
3365 pedwarn ("pointer/integer type mismatch in conditional expression");
3368 op2 = null_pointer_node;
3369 #if 0 /* The spec seems to say this is permitted. */
3370 if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE)
3371 pedwarn ("ANSI C forbids conditional expr between 0 and function pointer");
3374 result_type = type1;
3376 else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
3378 if (!integer_zerop (op1))
3379 pedwarn ("pointer/integer type mismatch in conditional expression");
3382 op1 = null_pointer_node;
3383 #if 0 /* The spec seems to say this is permitted. */
3384 if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE)
3385 pedwarn ("ANSI C forbids conditional expr between 0 and function pointer");
3388 result_type = type2;
3393 if (flag_cond_mismatch)
3394 result_type = void_type_node;
3397 error ("type mismatch in conditional expression");
3398 return error_mark_node;
3402 /* Merge const and volatile flags of the incoming types. */
3404 = build_type_variant (result_type,
3405 TREE_READONLY (op1) || TREE_READONLY (op2),
3406 TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
3408 if (result_type != TREE_TYPE (op1))
3409 op1 = convert_and_check (result_type, op1);
3410 if (result_type != TREE_TYPE (op2))
3411 op2 = convert_and_check (result_type, op2);
3414 if (code1 == RECORD_TYPE || code1 == UNION_TYPE)
3416 result_type = TREE_TYPE (op1);
3417 if (TREE_CONSTANT (ifexp))
3418 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3420 if (TYPE_MODE (result_type) == BLKmode)
3422 register tree tempvar
3423 = build_decl (VAR_DECL, NULL_TREE, result_type);
3424 register tree xop1 = build_modify_expr (tempvar, op1);
3425 register tree xop2 = build_modify_expr (tempvar, op2);
3426 register tree result = fold (build (COND_EXPR, result_type,
3427 ifexp, xop1, xop2));
3429 layout_decl (tempvar, TYPE_ALIGN (result_type));
3430 /* No way to handle variable-sized objects here.
3431 I fear that the entire handling of BLKmode conditional exprs
3432 needs to be redone. */
3433 if (TREE_CODE (DECL_SIZE (tempvar)) != INTEGER_CST)
3436 = assign_stack_local (DECL_MODE (tempvar),
3437 (TREE_INT_CST_LOW (DECL_SIZE (tempvar))
3438 + BITS_PER_UNIT - 1)
3442 TREE_SIDE_EFFECTS (result)
3443 = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1)
3444 | TREE_SIDE_EFFECTS (op2);
3445 return build (COMPOUND_EXPR, result_type, result, tempvar);
3450 if (TREE_CODE (ifexp) == INTEGER_CST)
3451 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3453 return fold (build (COND_EXPR, result_type, ifexp, op1, op2));
3456 /* Given a list of expressions, return a compound expression
3457 that performs them all and returns the value of the last of them. */
3460 build_compound_expr (list)
3463 return internal_build_compound_expr (list, TRUE);
3467 internal_build_compound_expr (list, first_p)
3473 if (TREE_CHAIN (list) == 0)
3475 #if 0 /* If something inside inhibited lvalueness, we should not override. */
3476 /* Consider (x, y+0), which is not an lvalue since y+0 is not. */
3478 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3479 if (TREE_CODE (list) == NON_LVALUE_EXPR)
3480 list = TREE_OPERAND (list, 0);
3483 /* Don't let (0, 0) be null pointer constant. */
3484 if (!first_p && integer_zerop (TREE_VALUE (list)))
3485 return non_lvalue (TREE_VALUE (list));
3486 return TREE_VALUE (list);
3489 if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0)
3491 /* Convert arrays to pointers when there really is a comma operator. */
3492 if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE)
3493 TREE_VALUE (TREE_CHAIN (list))
3494 = default_conversion (TREE_VALUE (TREE_CHAIN (list)));
3497 rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE);
3499 /* When pedantic, a compound expression can be neither an lvalue
3500 nor an integer constant expression. */
3501 if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic)
3504 return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest);
3507 /* Build an expression representing a cast to type TYPE of expression EXPR. */
3510 build_c_cast (type, expr)
3514 register tree value = expr;
3516 if (type == error_mark_node || expr == error_mark_node)
3517 return error_mark_node;
3518 type = TYPE_MAIN_VARIANT (type);
3521 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3522 if (TREE_CODE (value) == NON_LVALUE_EXPR)
3523 value = TREE_OPERAND (value, 0);
3526 if (TREE_CODE (type) == ARRAY_TYPE)
3528 error ("cast specifies array type");
3529 return error_mark_node;
3532 if (TREE_CODE (type) == FUNCTION_TYPE)
3534 error ("cast specifies function type");
3535 return error_mark_node;
3538 if (type == TREE_TYPE (value))
3542 if (TREE_CODE (type) == RECORD_TYPE
3543 || TREE_CODE (type) == UNION_TYPE)
3544 pedwarn ("ANSI C forbids casting nonscalar to the same type");
3547 else if (TREE_CODE (type) == UNION_TYPE)
3550 if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
3551 || TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE)
3552 value = default_conversion (value);
3554 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3555 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
3556 TYPE_MAIN_VARIANT (TREE_TYPE (value))))
3565 pedwarn ("ANSI C forbids casts to union type");
3566 if (TYPE_NAME (type) != 0)
3568 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3569 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3571 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3575 t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE,
3576 build_tree_list (field, value)),
3578 TREE_CONSTANT (t) = TREE_CONSTANT (value);
3581 error ("cast to union type from type not present in union");
3582 return error_mark_node;
3588 /* If casting to void, avoid the error that would come
3589 from default_conversion in the case of a non-lvalue array. */
3590 if (type == void_type_node)
3591 return build1 (CONVERT_EXPR, type, value);
3593 /* Convert functions and arrays to pointers,
3594 but don't convert any other types. */
3595 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
3596 || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE)
3597 value = default_conversion (value);
3598 otype = TREE_TYPE (value);
3600 /* Optionally warn about potentially worrisome casts. */
3603 && TREE_CODE (type) == POINTER_TYPE
3604 && TREE_CODE (otype) == POINTER_TYPE)
3606 if (TYPE_VOLATILE (TREE_TYPE (otype))
3607 && ! TYPE_VOLATILE (TREE_TYPE (type)))
3608 pedwarn ("cast discards `volatile' from pointer target type");
3609 if (TYPE_READONLY (TREE_TYPE (otype))
3610 && ! TYPE_READONLY (TREE_TYPE (type)))
3611 pedwarn ("cast discards `const' from pointer target type");
3614 /* Warn about possible alignment problems. */
3615 if (STRICT_ALIGNMENT && warn_cast_align
3616 && TREE_CODE (type) == POINTER_TYPE
3617 && TREE_CODE (otype) == POINTER_TYPE
3618 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
3619 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
3620 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
3621 warning ("cast increases required alignment of target type");
3623 if (TREE_CODE (type) == INTEGER_TYPE
3624 && TREE_CODE (otype) == POINTER_TYPE
3625 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3626 && !TREE_CONSTANT (value))
3627 warning ("cast from pointer to integer of different size");
3629 if (warn_bad_function_cast
3630 && TREE_CODE (value) == CALL_EXPR
3631 && TREE_CODE (type) != TREE_CODE (otype))
3632 warning ("cast does not match function type");
3634 if (TREE_CODE (type) == POINTER_TYPE
3635 && TREE_CODE (otype) == INTEGER_TYPE
3636 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3638 /* Don't warn about converting 0 to pointer,
3639 provided the 0 was explicit--not cast or made by folding. */
3640 && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))
3642 /* Don't warn about converting any constant. */
3643 && !TREE_CONSTANT (value))
3644 warning ("cast to pointer from integer of different size");
3647 value = convert (type, value);
3649 /* Ignore any integer overflow caused by the cast. */
3650 if (TREE_CODE (value) == INTEGER_CST)
3652 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
3653 TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
3657 /* Pedantically, don't ley (void *) (FOO *) 0 be a null pointer constant. */
3658 if (pedantic && TREE_CODE (value) == INTEGER_CST
3659 && TREE_CODE (expr) == INTEGER_CST
3660 && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)
3661 value = non_lvalue (value);
3663 /* If pedantic, don't let a cast be an lvalue. */
3664 if (value == expr && pedantic)
3665 value = non_lvalue (value);
3670 /* Build an assignment expression of lvalue LHS from value RHS.
3671 MODIFYCODE is the code for a binary operator that we use
3672 to combine the old value of LHS with RHS to get the new value.
3673 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
3676 build_modify_expr (lhs, modifycode, rhs)
3678 enum tree_code modifycode;
3680 register tree result;
3682 tree lhstype = TREE_TYPE (lhs);
3683 tree olhstype = lhstype;
3685 /* Types that aren't fully specified cannot be used in assignments. */
3686 lhs = require_complete_type (lhs);
3688 /* Avoid duplicate error messages from operands that had errors. */
3689 if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
3690 return error_mark_node;
3692 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3693 /* Do not use STRIP_NOPS here. We do not want an enumerator
3694 whose value is 0 to count as a null pointer constant. */
3695 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
3696 rhs = TREE_OPERAND (rhs, 0);
3700 /* Handle control structure constructs used as "lvalues". */
3702 switch (TREE_CODE (lhs))
3704 /* Handle (a, b) used as an "lvalue". */
3706 pedantic_lvalue_warning (COMPOUND_EXPR);
3707 newrhs = build_modify_expr (TREE_OPERAND (lhs, 1),
3709 if (TREE_CODE (newrhs) == ERROR_MARK)
3710 return error_mark_node;
3711 return build (COMPOUND_EXPR, lhstype,
3712 TREE_OPERAND (lhs, 0), newrhs);
3714 /* Handle (a ? b : c) used as an "lvalue". */
3716 pedantic_lvalue_warning (COND_EXPR);
3717 rhs = save_expr (rhs);
3719 /* Produce (a ? (b = rhs) : (c = rhs))
3720 except that the RHS goes through a save-expr
3721 so the code to compute it is only emitted once. */
3723 = build_conditional_expr (TREE_OPERAND (lhs, 0),
3724 build_modify_expr (TREE_OPERAND (lhs, 1),
3726 build_modify_expr (TREE_OPERAND (lhs, 2),
3728 if (TREE_CODE (cond) == ERROR_MARK)
3730 /* Make sure the code to compute the rhs comes out
3731 before the split. */
3732 return build (COMPOUND_EXPR, TREE_TYPE (lhs),
3733 /* But cast it to void to avoid an "unused" error. */
3734 convert (void_type_node, rhs), cond);
3738 /* If a binary op has been requested, combine the old LHS value with the RHS
3739 producing the value we should actually store into the LHS. */
3741 if (modifycode != NOP_EXPR)
3743 lhs = stabilize_reference (lhs);
3744 newrhs = build_binary_op (modifycode, lhs, rhs, 1);
3747 /* Handle a cast used as an "lvalue".
3748 We have already performed any binary operator using the value as cast.
3749 Now convert the result to the cast type of the lhs,
3750 and then true type of the lhs and store it there;
3751 then convert result back to the cast type to be the value
3752 of the assignment. */
3754 switch (TREE_CODE (lhs))
3759 case FIX_TRUNC_EXPR:
3760 case FIX_FLOOR_EXPR:
3761 case FIX_ROUND_EXPR:
3763 if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE
3764 || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE)
3765 newrhs = default_conversion (newrhs);
3767 tree inner_lhs = TREE_OPERAND (lhs, 0);
3769 result = build_modify_expr (inner_lhs, NOP_EXPR,
3770 convert (TREE_TYPE (inner_lhs),
3771 convert (lhstype, newrhs)));
3772 if (TREE_CODE (result) == ERROR_MARK)
3774 pedantic_lvalue_warning (CONVERT_EXPR);
3775 return convert (TREE_TYPE (lhs), result);
3779 /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
3780 Reject anything strange now. */
3782 if (!lvalue_or_else (lhs, "assignment"))
3783 return error_mark_node;
3785 /* Warn about storing in something that is `const'. */
3787 if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
3788 || ((TREE_CODE (lhstype) == RECORD_TYPE
3789 || TREE_CODE (lhstype) == UNION_TYPE)
3790 && C_TYPE_FIELDS_READONLY (lhstype)))
3791 readonly_warning (lhs, "assignment");
3793 /* If storing into a structure or union member,
3794 it has probably been given type `int'.
3795 Compute the type that would go with
3796 the actual amount of storage the member occupies. */
3798 if (TREE_CODE (lhs) == COMPONENT_REF
3799 && (TREE_CODE (lhstype) == INTEGER_TYPE
3800 || TREE_CODE (lhstype) == REAL_TYPE
3801 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
3802 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
3804 /* If storing in a field that is in actuality a short or narrower than one,
3805 we must store in the field in its actual type. */
3807 if (lhstype != TREE_TYPE (lhs))
3809 lhs = copy_node (lhs);
3810 TREE_TYPE (lhs) = lhstype;
3813 /* Convert new value to destination type. */
3815 newrhs = convert_for_assignment (lhstype, newrhs, "assignment",
3816 NULL_TREE, NULL_TREE, 0);
3817 if (TREE_CODE (newrhs) == ERROR_MARK)
3818 return error_mark_node;
3820 result = build (MODIFY_EXPR, lhstype, lhs, newrhs);
3821 TREE_SIDE_EFFECTS (result) = 1;
3823 /* If we got the LHS in a different type for storing in,
3824 convert the result back to the nominal type of LHS
3825 so that the value we return always has the same type
3826 as the LHS argument. */
3828 if (olhstype == TREE_TYPE (result))
3830 return convert_for_assignment (olhstype, result, "assignment",
3831 NULL_TREE, NULL_TREE, 0);
3834 /* Convert value RHS to type TYPE as preparation for an assignment
3835 to an lvalue of type TYPE.
3836 The real work of conversion is done by `convert'.
3837 The purpose of this function is to generate error messages
3838 for assignments that are not allowed in C.
3839 ERRTYPE is a string to use in error messages:
3840 "assignment", "return", etc. If it is null, this is parameter passing
3841 for a function call (and different error messages are output). Otherwise,
3842 it may be a name stored in the spelling stack and interpreted by
3845 FUNNAME is the name of the function being called,
3846 as an IDENTIFIER_NODE, or null.
3847 PARMNUM is the number of the argument, for printing in error messages. */
3850 convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum)
3853 tree fundecl, funname;
3856 register enum tree_code codel = TREE_CODE (type);
3857 register tree rhstype;
3858 register enum tree_code coder;
3860 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3861 /* Do not use STRIP_NOPS here. We do not want an enumerator
3862 whose value is 0 to count as a null pointer constant. */
3863 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
3864 rhs = TREE_OPERAND (rhs, 0);
3866 if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
3867 || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE)
3868 rhs = default_conversion (rhs);
3869 else if (optimize && TREE_CODE (rhs) == VAR_DECL)
3870 rhs = decl_constant_value (rhs);
3872 rhstype = TREE_TYPE (rhs);
3873 coder = TREE_CODE (rhstype);
3875 if (coder == ERROR_MARK)
3876 return error_mark_node;
3878 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
3880 overflow_warning (rhs);
3881 /* Check for Objective-C protocols. This will issue a warning if
3882 there are protocol violations. No need to use the return value. */
3883 maybe_objc_comptypes (type, rhstype, 0);
3887 if (coder == VOID_TYPE)
3889 error ("void value not ignored as it ought to be");
3890 return error_mark_node;
3892 /* Arithmetic types all interconvert, and enum is treated like int. */
3893 if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == ENUMERAL_TYPE
3894 || codel == COMPLEX_TYPE)
3896 (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == ENUMERAL_TYPE
3897 || coder == COMPLEX_TYPE))
3898 return convert_and_check (type, rhs);
3899 /* Conversion to a union from its member types. */
3900 else if (codel == UNION_TYPE)
3903 for (memb_types = TYPE_FIELDS (type); memb_types;
3904 memb_types = TREE_CHAIN (memb_types))
3906 if (comptypes (TREE_TYPE (memb_types), TREE_TYPE (rhs)))
3909 && !(fundecl != 0 && DECL_IN_SYSTEM_HEADER (fundecl)))
3910 pedwarn ("ANSI C prohibits argument conversion to union type");
3911 return build1 (NOP_EXPR, type, rhs);
3913 else if (coder == POINTER_TYPE
3914 && TREE_CODE (TREE_TYPE (memb_types)) == POINTER_TYPE)
3916 tree memb_type = TREE_TYPE (memb_types);
3917 register tree ttl = TREE_TYPE (memb_type);
3918 register tree ttr = TREE_TYPE (rhstype);
3920 /* Any non-function converts to a [const][volatile] void *
3921 and vice versa; otherwise, targets must be the same.
3922 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
3923 if (TYPE_MAIN_VARIANT (ttl) == void_type_node
3924 || TYPE_MAIN_VARIANT (ttr) == void_type_node
3925 || comp_target_types (memb_type, rhstype))
3927 /* Const and volatile mean something different for function types,
3928 so the usual warnings are not appropriate. */
3929 if (TREE_CODE (ttr) != FUNCTION_TYPE
3930 || TREE_CODE (ttl) != FUNCTION_TYPE)
3932 if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr))
3933 warn_for_assignment ("%s discards `const' from pointer target type",
3934 get_spelling (errtype), funname, parmnum);
3935 if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr))
3936 warn_for_assignment ("%s discards `volatile' from pointer target type",
3937 get_spelling (errtype), funname, parmnum);
3941 /* Because const and volatile on functions are restrictions
3942 that say the function will not do certain things,
3943 it is okay to use a const or volatile function
3944 where an ordinary one is wanted, but not vice-versa. */
3945 if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr))
3946 warn_for_assignment ("%s makes `const *' function pointer from non-const",
3947 get_spelling (errtype), funname, parmnum);
3948 if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr))
3949 warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile",
3950 get_spelling (errtype), funname, parmnum);
3953 && !(fundecl != 0 && DECL_IN_SYSTEM_HEADER (fundecl)))
3954 pedwarn ("ANSI C prohibits argument conversion to union type");
3955 return build1 (NOP_EXPR, type, rhs);
3960 /* Conversions among pointers */
3961 else if (codel == POINTER_TYPE && coder == POINTER_TYPE)
3963 register tree ttl = TREE_TYPE (type);
3964 register tree ttr = TREE_TYPE (rhstype);
3966 /* Any non-function converts to a [const][volatile] void *
3967 and vice versa; otherwise, targets must be the same.
3968 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
3969 if (TYPE_MAIN_VARIANT (ttl) == void_type_node
3970 || TYPE_MAIN_VARIANT (ttr) == void_type_node
3971 || comp_target_types (type, rhstype)
3972 || (unsigned_type (TYPE_MAIN_VARIANT (ttl))
3973 == unsigned_type (TYPE_MAIN_VARIANT (ttr))))
3976 && ((TYPE_MAIN_VARIANT (ttl) == void_type_node
3977 && TREE_CODE (ttr) == FUNCTION_TYPE)
3979 (TYPE_MAIN_VARIANT (ttr) == void_type_node
3980 /* Check TREE_CODE to catch cases like (void *) (char *) 0
3981 which are not ANSI null ptr constants. */
3982 && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR)
3983 && TREE_CODE (ttl) == FUNCTION_TYPE)))
3984 warn_for_assignment ("ANSI forbids %s between function pointer and `void *'",
3985 get_spelling (errtype), funname, parmnum);
3986 /* Const and volatile mean something different for function types,
3987 so the usual warnings are not appropriate. */
3988 else if (TREE_CODE (ttr) != FUNCTION_TYPE
3989 || TREE_CODE (ttl) != FUNCTION_TYPE)
3991 if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr))
3992 warn_for_assignment ("%s discards `const' from pointer target type",
3993 get_spelling (errtype), funname, parmnum);
3994 else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr))
3995 warn_for_assignment ("%s discards `volatile' from pointer target type",
3996 get_spelling (errtype), funname, parmnum);
3997 /* If this is not a case of ignoring a mismatch in signedness,
3999 else if (TYPE_MAIN_VARIANT (ttl) == void_type_node
4000 || TYPE_MAIN_VARIANT (ttr) == void_type_node
4001 || comp_target_types (type, rhstype))
4003 /* If there is a mismatch, do warn. */
4005 warn_for_assignment ("pointer targets in %s differ in signedness",
4006 get_spelling (errtype), funname, parmnum);
4010 /* Because const and volatile on functions are restrictions
4011 that say the function will not do certain things,
4012 it is okay to use a const or volatile function
4013 where an ordinary one is wanted, but not vice-versa. */
4014 if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr))
4015 warn_for_assignment ("%s makes `const *' function pointer from non-const",
4016 get_spelling (errtype), funname, parmnum);
4017 if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr))
4018 warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile",
4019 get_spelling (errtype), funname, parmnum);
4023 warn_for_assignment ("%s from incompatible pointer type",
4024 get_spelling (errtype), funname, parmnum);
4025 return convert (type, rhs);
4027 else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
4029 /* An explicit constant 0 can convert to a pointer,
4030 or one that results from arithmetic, even including
4031 a cast to integer type. */
4032 if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))
4034 ! (TREE_CODE (rhs) == NOP_EXPR
4035 && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
4036 && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST
4037 && integer_zerop (TREE_OPERAND (rhs, 0))))
4039 warn_for_assignment ("%s makes pointer from integer without a cast",
4040 get_spelling (errtype), funname, parmnum);
4041 return convert (type, rhs);
4043 return null_pointer_node;
4045 else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
4047 warn_for_assignment ("%s makes integer from pointer without a cast",
4048 get_spelling (errtype), funname, parmnum);
4049 return convert (type, rhs);
4056 tree selector = maybe_building_objc_message_expr ();
4058 if (selector && parmnum > 2)
4059 error ("incompatible type for argument %d of `%s'",
4060 parmnum - 2, IDENTIFIER_POINTER (selector));
4062 error ("incompatible type for argument %d of `%s'",
4063 parmnum, IDENTIFIER_POINTER (funname));
4066 error ("incompatible type for argument %d of indirect function call",
4070 error ("incompatible types in %s", get_spelling (errtype));
4072 return error_mark_node;
4075 /* Print a warning using MSG.
4076 It gets OPNAME as its one parameter.
4077 If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'".
4078 FUNCTION and ARGNUM are handled specially if we are building an
4079 Objective-C selector. */
4082 warn_for_assignment (msg, opname, function, argnum)
4088 static char argstring[] = "passing arg %d of `%s'";
4089 static char argnofun[] = "passing arg %d";
4093 tree selector = maybe_building_objc_message_expr ();
4095 if (selector && argnum > 2)
4097 function = selector;
4102 /* Function name is known; supply it. */
4103 opname = (char *) alloca (IDENTIFIER_LENGTH (function)
4104 + sizeof (argstring) + 25 /*%d*/ + 1);
4105 sprintf (opname, argstring, argnum, IDENTIFIER_POINTER (function));
4109 /* Function name unknown (call through ptr); just give arg number. */
4110 opname = (char *) alloca (sizeof (argnofun) + 25 /*%d*/ + 1);
4111 sprintf (opname, argnofun, argnum);
4114 pedwarn (msg, opname);
4117 /* Return nonzero if VALUE is a valid constant-valued expression
4118 for use in initializing a static variable; one that can be an
4119 element of a "constant" initializer.
4121 Return null_pointer_node if the value is absolute;
4122 if it is relocatable, return the variable that determines the relocation.
4123 We assume that VALUE has been folded as much as possible;
4124 therefore, we do not need to check for such things as
4125 arithmetic-combinations of integers. */
4128 initializer_constant_valid_p (value, endtype)
4132 switch (TREE_CODE (value))
4135 if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
4136 && TREE_CONSTANT (value))
4138 initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)),
4141 return TREE_STATIC (value) ? null_pointer_node : 0;
4147 return null_pointer_node;
4150 return TREE_OPERAND (value, 0);
4152 case NON_LVALUE_EXPR:
4153 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4157 /* Allow conversions between pointer types. */
4158 if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE
4159 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE)
4160 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4162 /* Allow conversions between real types. */
4163 if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE
4164 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE)
4165 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4167 /* Allow length-preserving conversions between integer types. */
4168 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4169 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE
4170 && (TYPE_PRECISION (TREE_TYPE (value))
4171 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4172 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4174 /* Allow conversions between other integer types only if
4176 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4177 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE)
4179 tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4181 if (inner == null_pointer_node)
4182 return null_pointer_node;
4186 /* Allow (int) &foo provided int is as wide as a pointer. */
4187 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4188 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE
4189 && (TYPE_PRECISION (TREE_TYPE (value))
4190 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4191 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4194 /* Likewise conversions from int to pointers. */
4195 if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE
4196 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE
4197 && (TYPE_PRECISION (TREE_TYPE (value))
4198 <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4199 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4202 /* Allow conversions to union types if the value inside is okay. */
4203 if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE)
4204 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4209 if (TREE_CODE (endtype) == INTEGER_TYPE
4210 && TYPE_PRECISION (endtype) < POINTER_SIZE)
4213 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4215 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4217 /* If either term is absolute, use the other terms relocation. */
4218 if (valid0 == null_pointer_node)
4220 if (valid1 == null_pointer_node)
4226 if (TREE_CODE (endtype) == INTEGER_TYPE
4227 && TYPE_PRECISION (endtype) < POINTER_SIZE)
4230 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4232 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4234 /* Win if second argument is absolute. */
4235 if (valid1 == null_pointer_node)
4237 /* Win if both arguments have the same relocation.
4238 Then the value is absolute. */
4239 if (valid0 == valid1)
4240 return null_pointer_node;
4248 /* If VALUE is a compound expr all of whose expressions are constant, then
4249 return its value. Otherwise, return error_mark_node.
4251 This is for handling COMPOUND_EXPRs as initializer elements
4252 which is allowed with a warning when -pedantic is specified. */
4255 valid_compound_expr_initializer (value, endtype)
4259 if (TREE_CODE (value) == COMPOUND_EXPR)
4261 if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
4263 return error_mark_node;
4264 return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
4267 else if (! TREE_CONSTANT (value)
4268 && ! initializer_constant_valid_p (value, endtype))
4269 return error_mark_node;
4274 /* Perform appropriate conversions on the initial value of a variable,
4275 store it in the declaration DECL,
4276 and print any error messages that are appropriate.
4277 If the init is invalid, store an ERROR_MARK. */
4280 store_init_value (decl, init)
4283 register tree value, type;
4285 /* If variable's type was invalidly declared, just ignore it. */
4287 type = TREE_TYPE (decl);
4288 if (TREE_CODE (type) == ERROR_MARK)
4291 /* Digest the specified initializer into an expression. */
4293 value = digest_init (type, init, TREE_STATIC (decl),
4294 TREE_STATIC (decl) || pedantic);
4296 /* Store the expression if valid; else report error. */
4299 /* Note that this is the only place we can detect the error
4300 in a case such as struct foo bar = (struct foo) { x, y };
4301 where there is one initial value which is a constructor expression. */
4302 if (value == error_mark_node)
4304 else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value))
4306 error ("initializer for static variable is not constant");
4307 value = error_mark_node;
4309 else if (TREE_STATIC (decl)
4310 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
4312 error ("initializer for static variable uses complicated arithmetic");
4313 value = error_mark_node;
4317 if (pedantic && TREE_CODE (value) == CONSTRUCTOR)
4319 if (! TREE_CONSTANT (value))
4320 pedwarn ("aggregate initializer is not constant");
4321 else if (! TREE_STATIC (value))
4322 pedwarn ("aggregate initializer uses complicated arithmetic");
4327 DECL_INITIAL (decl) = value;
4329 /* ANSI wants warnings about out-of-range constant initializers. */
4330 STRIP_TYPE_NOPS (value);
4331 constant_expression_warning (value);
4334 /* Methods for storing and printing names for error messages. */
4336 /* Implement a spelling stack that allows components of a name to be pushed
4337 and popped. Each element on the stack is this structure. */
4349 #define SPELLING_STRING 1
4350 #define SPELLING_MEMBER 2
4351 #define SPELLING_BOUNDS 3
4353 static struct spelling *spelling; /* Next stack element (unused). */
4354 static struct spelling *spelling_base; /* Spelling stack base. */
4355 static int spelling_size; /* Size of the spelling stack. */
4357 /* Macros to save and restore the spelling stack around push_... functions.
4358 Alternative to SAVE_SPELLING_STACK. */
4360 #define SPELLING_DEPTH() (spelling - spelling_base)
4361 #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth)
4363 /* Save and restore the spelling stack around arbitrary C code. */
4365 #define SAVE_SPELLING_DEPTH(code) \
4367 int __depth = SPELLING_DEPTH (); \
4369 RESTORE_SPELLING_DEPTH (__depth); \
4372 /* Push an element on the spelling stack with type KIND and assign VALUE
4375 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
4377 int depth = SPELLING_DEPTH (); \
4379 if (depth >= spelling_size) \
4381 spelling_size += 10; \
4382 if (spelling_base == 0) \
4384 = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \
4387 = (struct spelling *) xrealloc (spelling_base, \
4388 spelling_size * sizeof (struct spelling)); \
4389 RESTORE_SPELLING_DEPTH (depth); \
4392 spelling->kind = (KIND); \
4393 spelling->MEMBER = (VALUE); \
4397 /* Push STRING on the stack. Printed literally. */
4400 push_string (string)
4403 PUSH_SPELLING (SPELLING_STRING, string, u.s);
4406 /* Push a member name on the stack. Printed as '.' STRING. */
4409 push_member_name (decl)
4414 = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
4415 PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
4418 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
4421 push_array_bounds (bounds)
4424 PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
4427 /* Compute the maximum size in bytes of the printed spelling. */
4432 register int size = 0;
4433 register struct spelling *p;
4435 for (p = spelling_base; p < spelling; p++)
4437 if (p->kind == SPELLING_BOUNDS)
4440 size += strlen (p->u.s) + 1;
4446 /* Print the spelling to BUFFER and return it. */
4449 print_spelling (buffer)
4450 register char *buffer;
4452 register char *d = buffer;
4454 register struct spelling *p;
4456 for (p = spelling_base; p < spelling; p++)
4457 if (p->kind == SPELLING_BOUNDS)
4459 sprintf (d, "[%d]", p->u.i);
4464 if (p->kind == SPELLING_MEMBER)
4466 for (s = p->u.s; *d = *s++; d++)
4473 /* Provide a means to pass component names derived from the spelling stack. */
4475 char initialization_message;
4477 /* Interpret the spelling of the given ERRTYPE message. */
4480 get_spelling (errtype)
4483 static char *buffer;
4484 static int size = -1;
4486 if (errtype == &initialization_message)
4488 /* Avoid counting chars */
4489 static char message[] = "initialization of `%s'";
4490 register int needed = sizeof (message) + spelling_length () + 1;
4494 buffer = (char *) xmalloc (size = needed);
4496 buffer = (char *) xrealloc (buffer, size = needed);
4498 temp = (char *) alloca (needed);
4499 sprintf (buffer, message, print_spelling (temp));
4506 /* Issue an error message for a bad initializer component.
4507 FORMAT describes the message. OFWHAT is the name for the component.
4508 LOCAL is a format string for formatting the insertion of the name
4511 If OFWHAT is null, the component name is stored on the spelling stack.
4512 If the component name is a null string, then LOCAL is omitted entirely. */
4515 error_init (format, local, ofwhat)
4516 char *format, *local, *ofwhat;
4521 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4522 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4525 sprintf (buffer, local, ofwhat);
4529 error (format, buffer);
4532 /* Issue a pedantic warning for a bad initializer component.
4533 FORMAT describes the message. OFWHAT is the name for the component.
4534 LOCAL is a format string for formatting the insertion of the name
4537 If OFWHAT is null, the component name is stored on the spelling stack.
4538 If the component name is a null string, then LOCAL is omitted entirely. */
4541 pedwarn_init (format, local, ofwhat)
4542 char *format, *local, *ofwhat;
4547 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4548 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4551 sprintf (buffer, local, ofwhat);
4555 pedwarn (format, buffer);
4558 /* Issue a warning for a bad initializer component.
4559 FORMAT describes the message. OFWHAT is the name for the component.
4560 LOCAL is a format string for formatting the insertion of the name
4563 If OFWHAT is null, the component name is stored on the spelling stack.
4564 If the component name is a null string, then LOCAL is omitted entirely. */
4567 warning_init (format, local, ofwhat)
4568 char *format, *local, *ofwhat;
4573 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4574 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4577 sprintf (buffer, local, ofwhat);
4581 warning (format, buffer);
4584 /* Digest the parser output INIT as an initializer for type TYPE.
4585 Return a C expression of type TYPE to represent the initial value.
4587 The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors
4588 if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT
4589 applies only to elements of constructors. */
4592 digest_init (type, init, require_constant, constructor_constant)
4594 int require_constant, constructor_constant;
4596 enum tree_code code = TREE_CODE (type);
4597 tree inside_init = init;
4599 if (init == error_mark_node)
4602 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4603 /* Do not use STRIP_NOPS here. We do not want an enumerator
4604 whose value is 0 to count as a null pointer constant. */
4605 if (TREE_CODE (init) == NON_LVALUE_EXPR)
4606 inside_init = TREE_OPERAND (init, 0);
4608 /* Initialization of an array of chars from a string constant
4609 optionally enclosed in braces. */
4611 if (code == ARRAY_TYPE)
4613 tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
4614 if ((typ1 == char_type_node
4615 || typ1 == signed_char_type_node
4616 || typ1 == unsigned_char_type_node
4617 || typ1 == unsigned_wchar_type_node
4618 || typ1 == signed_wchar_type_node)
4619 && ((inside_init && TREE_CODE (inside_init) == STRING_CST)))
4621 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4622 TYPE_MAIN_VARIANT (type)))
4625 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4627 && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node))
4629 error_init ("char-array%s initialized from wide string",
4631 return error_mark_node;
4633 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4635 && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node))
4637 error_init ("int-array%s initialized from non-wide string",
4639 return error_mark_node;
4642 TREE_TYPE (inside_init) = type;
4643 if (TYPE_DOMAIN (type) != 0
4644 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
4646 register int size = TREE_INT_CST_LOW (TYPE_SIZE (type));
4647 size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
4648 /* Subtract 1 (or sizeof (wchar_t))
4649 because it's ok to ignore the terminating null char
4650 that is counted in the length of the constant. */
4651 if (size < TREE_STRING_LENGTH (inside_init)
4652 - (TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)
4653 ? TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT
4656 "initializer-string for array of chars%s is too long",
4663 /* Any type can be initialized
4664 from an expression of the same type, optionally with braces. */
4666 if (inside_init && TREE_TYPE (inside_init) != 0
4667 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4668 TYPE_MAIN_VARIANT (type))
4669 || (code == ARRAY_TYPE
4670 && comptypes (TREE_TYPE (inside_init), type))
4671 || (code == POINTER_TYPE
4672 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4673 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)
4674 && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
4675 TREE_TYPE (type)))))
4677 if (code == POINTER_TYPE
4678 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4679 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE))
4680 inside_init = default_conversion (inside_init);
4681 else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
4682 && TREE_CODE (inside_init) != CONSTRUCTOR)
4684 error_init ("array%s initialized from non-constant array expression",
4686 return error_mark_node;
4689 if (optimize && TREE_CODE (inside_init) == VAR_DECL)
4690 inside_init = decl_constant_value (inside_init);
4692 /* Compound expressions can only occur here if -pedantic or
4693 -pedantic-errors is specified. In the later case, we always want
4694 an error. In the former case, we simply want a warning. */
4695 if (require_constant && pedantic
4696 && TREE_CODE (inside_init) == COMPOUND_EXPR)
4699 = valid_compound_expr_initializer (inside_init,
4700 TREE_TYPE (inside_init));
4701 if (inside_init == error_mark_node)
4702 error_init ("initializer element%s is not constant",
4705 pedwarn_init ("initializer element%s is not constant",
4707 if (flag_pedantic_errors)
4708 inside_init = error_mark_node;
4710 else if (require_constant && ! TREE_CONSTANT (inside_init))
4712 error_init ("initializer element%s is not constant",
4714 inside_init = error_mark_node;
4716 else if (require_constant
4717 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4719 error_init ("initializer element%s is not computable at load time",
4721 inside_init = error_mark_node;
4727 /* Handle scalar types, including conversions. */
4729 if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
4730 || code == ENUMERAL_TYPE || code == COMPLEX_TYPE)
4732 /* Note that convert_for_assignment calls default_conversion
4733 for arrays and functions. We must not call it in the
4734 case where inside_init is a null pointer constant. */
4736 = convert_for_assignment (type, init, "initialization",
4737 NULL_TREE, NULL_TREE, 0);
4739 if (require_constant && ! TREE_CONSTANT (inside_init))
4741 error_init ("initializer element%s is not constant",
4743 inside_init = error_mark_node;
4745 else if (require_constant
4746 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4748 error_init ("initializer element%s is not computable at load time",
4750 inside_init = error_mark_node;
4756 /* Come here only for records and arrays. */
4758 if (TYPE_SIZE (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4760 error_init ("variable-sized object%s may not be initialized",
4762 return error_mark_node;
4765 /* Traditionally, you can write struct foo x = 0;
4766 and it initializes the first element of x to 0. */
4767 if (flag_traditional)
4769 tree top = 0, prev = 0;
4770 while (TREE_CODE (type) == RECORD_TYPE
4771 || TREE_CODE (type) == ARRAY_TYPE
4772 || TREE_CODE (type) == QUAL_UNION_TYPE
4773 || TREE_CODE (type) == UNION_TYPE)
4775 tree temp = build (CONSTRUCTOR, type, NULL_TREE, NULL_TREE);
4779 TREE_OPERAND (prev, 1) = build_tree_list (NULL_TREE, temp);
4781 if (TREE_CODE (type) == ARRAY_TYPE)
4782 type = TREE_TYPE (type);
4783 else if (TYPE_FIELDS (type))
4784 type = TREE_TYPE (TYPE_FIELDS (type));
4787 error_init ("invalid initializer%s", " for `%s'", NULL);
4788 return error_mark_node;
4791 TREE_OPERAND (prev, 1)
4792 = build_tree_list (NULL_TREE,
4793 digest_init (type, init, require_constant,
4794 constructor_constant));
4797 error_init ("invalid initializer%s", " for `%s'", NULL);
4798 return error_mark_node;
4801 /* Handle initializers that use braces. */
4803 /* Type of object we are accumulating a constructor for.
4804 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
4805 static tree constructor_type;
4807 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
4809 static tree constructor_fields;
4811 /* For an ARRAY_TYPE, this is the specified index
4812 at which to store the next element we get.
4813 This is a special INTEGER_CST node that we modify in place. */
4814 static tree constructor_index;
4816 /* For an ARRAY_TYPE, this is the end index of the range
4817 to intitialize with the next element, or NULL in the ordinary case
4818 where the element is used just once. */
4819 static tree constructor_range_end;
4821 /* For an ARRAY_TYPE, this is the maximum index. */
4822 static tree constructor_max_index;
4824 /* For a RECORD_TYPE, this is the first field not yet written out. */
4825 static tree constructor_unfilled_fields;
4827 /* For an ARRAY_TYPE, this is the index of the first element
4828 not yet written out.
4829 This is a special INTEGER_CST node that we modify in place. */
4830 static tree constructor_unfilled_index;
4832 /* In a RECORD_TYPE, the byte index of the next consecutive field.
4833 This is so we can generate gaps between fields, when appropriate.
4834 This is a special INTEGER_CST node that we modify in place. */
4835 static tree constructor_bit_index;
4837 /* If we are saving up the elements rather than allocating them,
4838 this is the list of elements so far (in reverse order,
4839 most recent first). */
4840 static tree constructor_elements;
4842 /* 1 if so far this constructor's elements are all compile-time constants. */
4843 static int constructor_constant;
4845 /* 1 if so far this constructor's elements are all valid address constants. */
4846 static int constructor_simple;
4848 /* 1 if this constructor is erroneous so far. */
4849 static int constructor_erroneous;
4851 /* 1 if have called defer_addressed_constants. */
4852 static int constructor_subconstants_deferred;
4854 /* List of pending elements at this constructor level.
4855 These are elements encountered out of order
4856 which belong at places we haven't reached yet in actually
4857 writing the output. */
4858 static tree constructor_pending_elts;
4860 /* The SPELLING_DEPTH of this constructor. */
4861 static int constructor_depth;
4863 /* 0 if implicitly pushing constructor levels is allowed. */
4864 int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */
4866 /* 1 if this constructor level was entered implicitly. */
4867 static int constructor_implicit;
4869 static int require_constant_value;
4870 static int require_constant_elements;
4872 /* 1 if it is ok to output this constructor as we read it.
4873 0 means must accumulate a CONSTRUCTOR expression. */
4874 static int constructor_incremental;
4876 /* DECL node for which an initializer is being read.
4877 0 means we are reading a constructor expression
4878 such as (struct foo) {...}. */
4879 static tree constructor_decl;
4881 /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */
4882 static char *constructor_asmspec;
4884 /* Nonzero if this is an initializer for a top-level decl. */
4885 static int constructor_top_level;
4887 /* When we finish reading a constructor expression
4888 (constructor_decl is 0), the CONSTRUCTOR goes here. */
4889 static tree constructor_result;
4891 /* This stack has a level for each implicit or explicit level of
4892 structuring in the initializer, including the outermost one. It
4893 saves the values of most of the variables above. */
4895 struct constructor_stack
4897 struct constructor_stack *next;
4903 tree unfilled_index;
4904 tree unfilled_fields;
4910 /* If nonzero, this value should replace the entire
4911 constructor at this level. */
4912 tree replacement_value;
4921 struct constructor_stack *constructor_stack;
4923 /* This stack records separate initializers that are nested.
4924 Nested initializers can't happen in ANSI C, but GNU C allows them
4925 in cases like { ... (struct foo) { ... } ... }. */
4927 struct initializer_stack
4929 struct initializer_stack *next;
4932 struct constructor_stack *constructor_stack;
4934 struct spelling *spelling;
4935 struct spelling *spelling_base;
4939 char require_constant_value;
4940 char require_constant_elements;
4944 struct initializer_stack *initializer_stack;
4946 /* Prepare to parse and output the initializer for variable DECL. */
4949 start_init (decl, asmspec_tree, top_level)
4955 struct initializer_stack *p
4956 = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack));
4960 asmspec = TREE_STRING_POINTER (asmspec_tree);
4962 p->decl = constructor_decl;
4963 p->asmspec = constructor_asmspec;
4964 p->incremental = constructor_incremental;
4965 p->require_constant_value = require_constant_value;
4966 p->require_constant_elements = require_constant_elements;
4967 p->constructor_stack = constructor_stack;
4968 p->elements = constructor_elements;
4969 p->spelling = spelling;
4970 p->spelling_base = spelling_base;
4971 p->spelling_size = spelling_size;
4972 p->deferred = constructor_subconstants_deferred;
4973 p->top_level = constructor_top_level;
4974 p->next = initializer_stack;
4975 initializer_stack = p;
4977 constructor_decl = decl;
4978 constructor_incremental = top_level;
4979 constructor_asmspec = asmspec;
4980 constructor_subconstants_deferred = 0;
4981 constructor_top_level = top_level;
4985 require_constant_value = TREE_STATIC (decl);
4986 require_constant_elements
4987 = ((TREE_STATIC (decl) || pedantic)
4988 /* For a scalar, you can always use any value to initialize,
4989 even within braces. */
4990 && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
4991 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
4992 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
4993 || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
4994 locus = IDENTIFIER_POINTER (DECL_NAME (decl));
4995 constructor_incremental |= TREE_STATIC (decl);
4999 require_constant_value = 0;
5000 require_constant_elements = 0;
5001 locus = "(anonymous)";
5004 constructor_stack = 0;
5006 missing_braces_mentioned = 0;
5010 RESTORE_SPELLING_DEPTH (0);
5013 push_string (locus);
5019 struct initializer_stack *p = initializer_stack;
5021 /* Output subconstants (string constants, usually)
5022 that were referenced within this initializer and saved up.
5023 Must do this if and only if we called defer_addressed_constants. */
5024 if (constructor_subconstants_deferred)
5025 output_deferred_addressed_constants ();
5027 /* Free the whole constructor stack of this initializer. */
5028 while (constructor_stack)
5030 struct constructor_stack *q = constructor_stack;
5031 constructor_stack = q->next;
5035 /* Pop back to the data of the outer initializer (if any). */
5036 constructor_decl = p->decl;
5037 constructor_asmspec = p->asmspec;
5038 constructor_incremental = p->incremental;
5039 require_constant_value = p->require_constant_value;
5040 require_constant_elements = p->require_constant_elements;
5041 constructor_stack = p->constructor_stack;
5042 constructor_elements = p->elements;
5043 spelling = p->spelling;
5044 spelling_base = p->spelling_base;
5045 spelling_size = p->spelling_size;
5046 constructor_subconstants_deferred = p->deferred;
5047 constructor_top_level = p->top_level;
5048 initializer_stack = p->next;
5052 /* Call here when we see the initializer is surrounded by braces.
5053 This is instead of a call to push_init_level;
5054 it is matched by a call to pop_init_level.
5056 TYPE is the type to initialize, for a constructor expression.
5057 For an initializer for a decl, TYPE is zero. */
5060 really_start_incremental_init (type)
5063 struct constructor_stack *p
5064 = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5067 type = TREE_TYPE (constructor_decl);
5069 /* Turn off constructor_incremental if type is a struct with bitfields.
5070 Do this before the first push, so that the corrected value
5071 is available in finish_init. */
5072 check_init_type_bitfields (type);
5074 p->type = constructor_type;
5075 p->fields = constructor_fields;
5076 p->index = constructor_index;
5077 p->range_end = constructor_range_end;
5078 p->max_index = constructor_max_index;
5079 p->unfilled_index = constructor_unfilled_index;
5080 p->unfilled_fields = constructor_unfilled_fields;
5081 p->bit_index = constructor_bit_index;
5082 p->elements = constructor_elements;
5083 p->constant = constructor_constant;
5084 p->simple = constructor_simple;
5085 p->erroneous = constructor_erroneous;
5086 p->pending_elts = constructor_pending_elts;
5087 p->depth = constructor_depth;
5088 p->replacement_value = 0;
5090 p->incremental = constructor_incremental;
5093 constructor_stack = p;
5095 constructor_constant = 1;
5096 constructor_simple = 1;
5097 constructor_depth = SPELLING_DEPTH ();
5098 constructor_elements = 0;
5099 constructor_pending_elts = 0;
5100 constructor_type = type;
5102 if (TREE_CODE (constructor_type) == RECORD_TYPE
5103 || TREE_CODE (constructor_type) == UNION_TYPE)
5105 constructor_fields = TYPE_FIELDS (constructor_type);
5106 /* Skip any nameless bit fields atthe beginning. */
5107 while (constructor_fields != 0 && DECL_BIT_FIELD (constructor_fields)
5108 && DECL_NAME (constructor_fields) == 0)
5109 constructor_fields = TREE_CHAIN (constructor_fields);
5110 constructor_unfilled_fields = constructor_fields;
5111 constructor_bit_index = copy_node (integer_zero_node);
5113 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5115 constructor_range_end = 0;
5116 if (TYPE_DOMAIN (constructor_type))
5118 constructor_max_index
5119 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5121 = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5124 constructor_index = copy_node (integer_zero_node);
5125 constructor_unfilled_index = copy_node (constructor_index);
5129 /* Handle the case of int x = {5}; */
5130 constructor_fields = constructor_type;
5131 constructor_unfilled_fields = constructor_type;
5134 if (constructor_incremental)
5136 int momentary = suspend_momentary ();
5137 push_obstacks_nochange ();
5138 if (TREE_PERMANENT (constructor_decl))
5139 end_temporary_allocation ();
5140 make_decl_rtl (constructor_decl, constructor_asmspec,
5141 constructor_top_level);
5142 assemble_variable (constructor_decl, constructor_top_level, 0, 1);
5144 resume_momentary (momentary);
5147 if (constructor_incremental)
5149 defer_addressed_constants ();
5150 constructor_subconstants_deferred = 1;
5154 /* Push down into a subobject, for initialization.
5155 If this is for an explicit set of braces, IMPLICIT is 0.
5156 If it is because the next element belongs at a lower level,
5160 push_init_level (implicit)
5163 struct constructor_stack *p;
5165 /* If we've exhausted any levels that didn't have braces,
5167 while (constructor_stack->implicit)
5169 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5170 || TREE_CODE (constructor_type) == UNION_TYPE)
5171 && constructor_fields == 0)
5172 process_init_element (pop_init_level (1));
5173 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
5174 && tree_int_cst_lt (constructor_max_index, constructor_index))
5175 process_init_element (pop_init_level (1));
5180 /* Structure elements may require alignment. Do this now
5181 if necessary for the subaggregate. */
5182 if (constructor_incremental && constructor_type != 0
5183 && TREE_CODE (constructor_type) == RECORD_TYPE && constructor_fields)
5185 /* Advance to offset of this element. */
5186 if (! tree_int_cst_equal (constructor_bit_index,
5187 DECL_FIELD_BITPOS (constructor_fields)))
5189 int next = (TREE_INT_CST_LOW
5190 (DECL_FIELD_BITPOS (constructor_fields))
5192 int here = (TREE_INT_CST_LOW (constructor_bit_index)
5195 assemble_zeros (next - here);
5199 p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5200 p->type = constructor_type;
5201 p->fields = constructor_fields;
5202 p->index = constructor_index;
5203 p->range_end = constructor_range_end;
5204 p->max_index = constructor_max_index;
5205 p->unfilled_index = constructor_unfilled_index;
5206 p->unfilled_fields = constructor_unfilled_fields;
5207 p->bit_index = constructor_bit_index;
5208 p->elements = constructor_elements;
5209 p->constant = constructor_constant;
5210 p->simple = constructor_simple;
5211 p->erroneous = constructor_erroneous;
5212 p->pending_elts = constructor_pending_elts;
5213 p->depth = constructor_depth;
5214 p->replacement_value = 0;
5215 p->implicit = implicit;
5216 p->incremental = constructor_incremental;
5218 p->next = constructor_stack;
5219 constructor_stack = p;
5221 constructor_constant = 1;
5222 constructor_simple = 1;
5223 constructor_depth = SPELLING_DEPTH ();
5224 constructor_elements = 0;
5225 constructor_pending_elts = 0;
5227 /* Don't die if an entire brace-pair level is superfluous
5228 in the containing level. */
5229 if (constructor_type == 0)
5231 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5232 || TREE_CODE (constructor_type) == UNION_TYPE)
5234 /* Don't die if there are extra init elts at the end. */
5235 if (constructor_fields == 0)
5236 constructor_type = 0;
5239 constructor_type = TREE_TYPE (constructor_fields);
5240 push_member_name (constructor_fields);
5241 if (constructor_fields != constructor_unfilled_fields)
5242 constructor_incremental = 0;
5245 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5247 constructor_type = TREE_TYPE (constructor_type);
5248 push_array_bounds (TREE_INT_CST_LOW (constructor_index));
5249 if (! tree_int_cst_equal (constructor_index, constructor_unfilled_index)
5250 || constructor_range_end != 0)
5251 constructor_incremental = 0;
5254 if (constructor_type == 0)
5256 error_init ("extra brace group at end of initializer%s",
5258 constructor_fields = 0;
5259 constructor_unfilled_fields = 0;
5263 /* Turn off constructor_incremental if type is a struct with bitfields. */
5264 check_init_type_bitfields (constructor_type);
5266 if (implicit && warn_missing_braces && !missing_braces_mentioned)
5268 missing_braces_mentioned = 1;
5269 warning_init ("missing braces around initializer%s", " for `%s'", NULL);
5272 if (TREE_CODE (constructor_type) == RECORD_TYPE
5273 || TREE_CODE (constructor_type) == UNION_TYPE)
5275 constructor_fields = TYPE_FIELDS (constructor_type);
5276 /* Skip any nameless bit fields atthe beginning. */
5277 while (constructor_fields != 0 && DECL_BIT_FIELD (constructor_fields)
5278 && DECL_NAME (constructor_fields) == 0)
5279 constructor_fields = TREE_CHAIN (constructor_fields);
5280 constructor_unfilled_fields = constructor_fields;
5281 constructor_bit_index = copy_node (integer_zero_node);
5283 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5285 constructor_range_end = 0;
5286 if (TYPE_DOMAIN (constructor_type))
5288 constructor_max_index
5289 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5291 = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5294 constructor_index = copy_node (integer_zero_node);
5295 constructor_unfilled_index = copy_node (constructor_index);
5299 warning_init ("braces around scalar initializer%s", " for `%s'", NULL);
5300 constructor_fields = constructor_type;
5301 constructor_unfilled_fields = constructor_type;
5305 /* Don't read a struct incrementally if it has any bitfields,
5306 because the incremental reading code doesn't know how to
5307 handle bitfields yet. */
5310 check_init_type_bitfields (type)
5313 if (TREE_CODE (type) == RECORD_TYPE)
5316 for (tail = TYPE_FIELDS (type); tail;
5317 tail = TREE_CHAIN (tail))
5319 if (DECL_BIT_FIELD (tail)
5320 /* This catches cases like `int foo : 8;'. */
5321 || DECL_MODE (tail) != TYPE_MODE (TREE_TYPE (tail)))
5323 constructor_incremental = 0;
5327 check_init_type_bitfields (TREE_TYPE (tail));
5331 else if (TREE_CODE (type) == ARRAY_TYPE)
5332 check_init_type_bitfields (TREE_TYPE (type));
5335 /* At the end of an implicit or explicit brace level,
5336 finish up that level of constructor.
5337 If we were outputting the elements as they are read, return 0
5338 from inner levels (process_init_element ignores that),
5339 but return error_mark_node from the outermost level
5340 (that's what we want to put in DECL_INITIAL).
5341 Otherwise, return a CONSTRUCTOR expression. */
5344 pop_init_level (implicit)
5347 struct constructor_stack *p;
5349 tree constructor = 0;
5353 /* When we come to an explicit close brace,
5354 pop any inner levels that didn't have explicit braces. */
5355 while (constructor_stack->implicit)
5356 process_init_element (pop_init_level (1));
5359 p = constructor_stack;
5361 if (constructor_type != 0)
5362 size = int_size_in_bytes (constructor_type);
5364 /* Now output all pending elements. */
5365 output_pending_init_elements (1);
5367 #if 0 /* c-parse.in warns about {}. */
5368 /* In ANSI, each brace level must have at least one element. */
5369 if (! implicit && pedantic
5370 && (TREE_CODE (constructor_type) == ARRAY_TYPE
5371 ? integer_zerop (constructor_unfilled_index)
5372 : constructor_unfilled_fields == TYPE_FIELDS (constructor_type)))
5373 pedwarn_init ("empty braces in initializer%s", " for `%s'", NULL);
5376 /* Pad out the end of the structure. */
5378 if (p->replacement_value)
5380 /* If this closes a superfluous brace pair,
5381 just pass out the element between them. */
5382 constructor = p->replacement_value;
5383 /* If this is the top level thing within the initializer,
5384 and it's for a variable, then since we already called
5385 assemble_variable, we must output the value now. */
5386 if (p->next == 0 && constructor_decl != 0
5387 && constructor_incremental)
5389 constructor = digest_init (constructor_type, constructor,
5392 /* If initializing an array of unknown size,
5393 determine the size now. */
5394 if (TREE_CODE (constructor_type) == ARRAY_TYPE
5395 && TYPE_DOMAIN (constructor_type) == 0)
5400 push_obstacks_nochange ();
5401 if (TREE_PERMANENT (constructor_type))
5402 end_temporary_allocation ();
5404 momentary_p = suspend_momentary ();
5406 /* We shouldn't have an incomplete array type within
5408 if (constructor_stack->next)
5412 = complete_array_type (constructor_type,
5417 size = int_size_in_bytes (constructor_type);
5418 resume_momentary (momentary_p);
5422 output_constant (constructor, size);
5425 else if (constructor_type == 0)
5427 else if (TREE_CODE (constructor_type) != RECORD_TYPE
5428 && TREE_CODE (constructor_type) != UNION_TYPE
5429 && TREE_CODE (constructor_type) != ARRAY_TYPE
5430 && ! constructor_incremental)
5432 /* A nonincremental scalar initializer--just return
5433 the element, after verifying there is just one. */
5434 if (constructor_elements == 0)
5436 error_init ("empty scalar initializer%s",
5438 constructor = error_mark_node;
5440 else if (TREE_CHAIN (constructor_elements) != 0)
5442 error_init ("extra elements in scalar initializer%s",
5444 constructor = TREE_VALUE (constructor_elements);
5447 constructor = TREE_VALUE (constructor_elements);
5449 else if (! constructor_incremental)
5451 if (constructor_erroneous)
5452 constructor = error_mark_node;
5455 int momentary = suspend_momentary ();
5457 constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE,
5458 nreverse (constructor_elements));
5459 if (constructor_constant)
5460 TREE_CONSTANT (constructor) = 1;
5461 if (constructor_constant && constructor_simple)
5462 TREE_STATIC (constructor) = 1;
5464 resume_momentary (momentary);
5470 int momentary = suspend_momentary ();
5472 if (TREE_CODE (constructor_type) == RECORD_TYPE
5473 || TREE_CODE (constructor_type) == UNION_TYPE)
5475 /* Find the offset of the end of that field. */
5476 filled = size_binop (CEIL_DIV_EXPR,
5477 constructor_bit_index,
5478 size_int (BITS_PER_UNIT));
5480 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5482 /* If initializing an array of unknown size,
5483 determine the size now. */
5484 if (TREE_CODE (constructor_type) == ARRAY_TYPE
5485 && TYPE_DOMAIN (constructor_type) == 0)
5488 = size_binop (MINUS_EXPR,
5489 constructor_unfilled_index,
5492 push_obstacks_nochange ();
5493 if (TREE_PERMANENT (constructor_type))
5494 end_temporary_allocation ();
5495 maxindex = copy_node (maxindex);
5496 TYPE_DOMAIN (constructor_type) = build_index_type (maxindex);
5497 TREE_TYPE (maxindex) = TYPE_DOMAIN (constructor_type);
5499 /* TYPE_MAX_VALUE is always one less than the number of elements
5500 in the array, because we start counting at zero. Therefore,
5501 warn only if the value is less than zero. */
5503 && (tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
5505 error_with_decl (constructor_decl,
5506 "zero or negative array size `%s'");
5507 layout_type (constructor_type);
5508 size = int_size_in_bytes (constructor_type);
5512 filled = size_binop (MULT_EXPR, constructor_unfilled_index,
5513 size_in_bytes (TREE_TYPE (constructor_type)));
5519 assemble_zeros (size - TREE_INT_CST_LOW (filled));
5521 resume_momentary (momentary);
5525 constructor_type = p->type;
5526 constructor_fields = p->fields;
5527 constructor_index = p->index;
5528 constructor_range_end = p->range_end;
5529 constructor_max_index = p->max_index;
5530 constructor_unfilled_index = p->unfilled_index;
5531 constructor_unfilled_fields = p->unfilled_fields;
5532 constructor_bit_index = p->bit_index;
5533 constructor_elements = p->elements;
5534 constructor_constant = p->constant;
5535 constructor_simple = p->simple;
5536 constructor_erroneous = p->erroneous;
5537 constructor_pending_elts = p->pending_elts;
5538 constructor_depth = p->depth;
5539 constructor_incremental = p->incremental;
5540 RESTORE_SPELLING_DEPTH (constructor_depth);
5542 constructor_stack = p->next;
5545 if (constructor == 0)
5547 if (constructor_stack == 0)
5548 return error_mark_node;
5554 /* Within an array initializer, specify the next index to be initialized.
5555 FIRST is that index. If LAST is nonzero, then initialize a range
5556 of indices, running from FIRST through LAST. */
5559 set_init_index (first, last)
5562 while ((TREE_CODE (first) == NOP_EXPR
5563 || TREE_CODE (first) == CONVERT_EXPR
5564 || TREE_CODE (first) == NON_LVALUE_EXPR)
5565 && (TYPE_MODE (TREE_TYPE (first))
5566 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0)))))
5567 (first) = TREE_OPERAND (first, 0);
5569 while ((TREE_CODE (last) == NOP_EXPR
5570 || TREE_CODE (last) == CONVERT_EXPR
5571 || TREE_CODE (last) == NON_LVALUE_EXPR)
5572 && (TYPE_MODE (TREE_TYPE (last))
5573 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0)))))
5574 (last) = TREE_OPERAND (last, 0);
5576 if (TREE_CODE (first) != INTEGER_CST)
5577 error_init ("nonconstant array index in initializer%s", " for `%s'", NULL);
5578 else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
5579 error_init ("nonconstant array index in initializer%s", " for `%s'", NULL);
5580 else if (tree_int_cst_lt (first, constructor_unfilled_index))
5581 error_init ("duplicate array index in initializer%s", " for `%s'", NULL);
5584 TREE_INT_CST_LOW (constructor_index)
5585 = TREE_INT_CST_LOW (first);
5586 TREE_INT_CST_HIGH (constructor_index)
5587 = TREE_INT_CST_HIGH (first);
5589 if (last != 0 && tree_int_cst_lt (last, first))
5590 error_init ("empty index range in initializer%s", " for `%s'", NULL);
5594 pedwarn ("ANSI C forbids specifying element to initialize");
5595 constructor_range_end = last;
5600 /* Within a struct initializer, specify the next field to be initialized. */
5603 set_init_label (fieldname)
5609 for (tail = TYPE_FIELDS (constructor_type); tail;
5610 tail = TREE_CHAIN (tail))
5612 if (tail == constructor_unfilled_fields)
5614 if (DECL_NAME (tail) == fieldname)
5619 error ("unknown field `%s' specified in initializer",
5620 IDENTIFIER_POINTER (fieldname));
5622 error ("field `%s' already initialized",
5623 IDENTIFIER_POINTER (fieldname));
5626 constructor_fields = tail;
5628 pedwarn ("ANSI C forbids specifying structure member to initialize");
5632 /* "Output" the next constructor element.
5633 At top level, really output it to assembler code now.
5634 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
5635 TYPE is the data type that the containing data type wants here.
5636 FIELD is the field (a FIELD_DECL) or the index that this element fills.
5638 PENDING if non-nil means output pending elements that belong
5639 right after this element. (PENDING is normally 1;
5640 it is 0 while outputting pending elements, to avoid recursion.) */
5643 output_init_element (value, type, field, pending)
5644 tree value, type, field;
5649 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
5650 || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
5651 && !(TREE_CODE (value) == STRING_CST
5652 && TREE_CODE (type) == ARRAY_TYPE
5653 && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
5654 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
5655 TYPE_MAIN_VARIANT (type))))
5656 value = default_conversion (value);
5658 if (value == error_mark_node)
5659 constructor_erroneous = 1;
5660 else if (!TREE_CONSTANT (value))
5661 constructor_constant = 0;
5662 else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
5663 constructor_simple = 0;
5665 if (require_constant_value && ! TREE_CONSTANT (value))
5667 error_init ("initializer element%s is not constant",
5669 value = error_mark_node;
5671 else if (require_constant_elements
5672 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
5674 error_init ("initializer element%s is not computable at load time",
5676 value = error_mark_node;
5679 /* If this element duplicates one on constructor_pending_elts,
5680 print a message and ignore it. Don't do this when we're
5681 processing elements taken off constructor_pending_elts,
5682 because we'd always get spurious errors. */
5685 if (TREE_CODE (constructor_type) == RECORD_TYPE
5686 || TREE_CODE (constructor_type) == UNION_TYPE)
5688 if (purpose_member (field, constructor_pending_elts))
5690 error_init ("duplicate initializer%s", " for `%s'", NULL);
5694 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5697 for (tail = constructor_pending_elts; tail;
5698 tail = TREE_CHAIN (tail))
5699 if (TREE_PURPOSE (tail) != 0
5700 && TREE_CODE (TREE_PURPOSE (tail)) == INTEGER_CST
5701 && tree_int_cst_equal (TREE_PURPOSE (tail), constructor_index))
5706 error_init ("duplicate initializer%s", " for `%s'", NULL);
5712 /* If this element doesn't come next in sequence,
5713 put it on constructor_pending_elts. */
5714 if (TREE_CODE (constructor_type) == ARRAY_TYPE
5715 && !tree_int_cst_equal (field, constructor_unfilled_index))
5718 /* The copy_node is needed in case field is actually
5719 constructor_index, which is modified in place. */
5720 constructor_pending_elts
5721 = tree_cons (copy_node (field),
5722 digest_init (type, value, 0, 0),
5723 constructor_pending_elts);
5725 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5726 && field != constructor_unfilled_fields)
5728 /* We do this for records but not for unions. In a union,
5729 no matter which field is specified, it can be initialized
5730 right away since it starts at the beginning of the union. */
5732 constructor_pending_elts
5734 digest_init (type, value, 0, 0),
5735 constructor_pending_elts);
5739 /* Otherwise, output this element either to
5740 constructor_elements or to the assembler file. */
5744 if (! constructor_incremental)
5746 if (field && TREE_CODE (field) == INTEGER_CST)
5747 field = copy_node (field);
5748 constructor_elements
5749 = tree_cons (field, digest_init (type, value, 0, 0),
5750 constructor_elements);
5754 /* Structure elements may require alignment.
5755 Do this, if necessary. */
5756 if (TREE_CODE (constructor_type) == RECORD_TYPE)
5758 /* Advance to offset of this element. */
5759 if (! tree_int_cst_equal (constructor_bit_index,
5760 DECL_FIELD_BITPOS (field)))
5762 int next = (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field))
5764 int here = (TREE_INT_CST_LOW (constructor_bit_index)
5767 assemble_zeros (next - here);
5770 output_constant (digest_init (type, value, 0, 0),
5771 int_size_in_bytes (type));
5773 /* For a record or union,
5774 keep track of end position of last field. */
5775 if (TREE_CODE (constructor_type) == RECORD_TYPE
5776 || TREE_CODE (constructor_type) == UNION_TYPE)
5778 tree temp = size_binop (PLUS_EXPR, DECL_FIELD_BITPOS (field),
5780 TREE_INT_CST_LOW (constructor_bit_index)
5781 = TREE_INT_CST_LOW (temp);
5782 TREE_INT_CST_HIGH (constructor_bit_index)
5783 = TREE_INT_CST_HIGH (temp);
5788 /* Advance the variable that indicates sequential elements output. */
5789 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5791 tree tem = size_binop (PLUS_EXPR, constructor_unfilled_index,
5793 TREE_INT_CST_LOW (constructor_unfilled_index)
5794 = TREE_INT_CST_LOW (tem);
5795 TREE_INT_CST_HIGH (constructor_unfilled_index)
5796 = TREE_INT_CST_HIGH (tem);
5798 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
5799 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
5800 else if (TREE_CODE (constructor_type) == UNION_TYPE)
5801 constructor_unfilled_fields = 0;
5803 /* Now output any pending elements which have become next. */
5805 output_pending_init_elements (0);
5809 /* Output any pending elements which have become next.
5810 As we output elements, constructor_unfilled_{fields,index}
5811 advances, which may cause other elements to become next;
5812 if so, they too are output.
5814 If ALL is 0, we return when there are
5815 no more pending elements to output now.
5817 If ALL is 1, we output space as necessary so that
5818 we can output all the pending elements. */
5821 output_pending_init_elements (all)
5829 /* Look thru the whole pending list.
5830 If we find an element that should be output now,
5831 output it. Otherwise, set NEXT to the element
5832 that comes first among those still pending. */
5835 for (tail = constructor_pending_elts; tail;
5836 tail = TREE_CHAIN (tail))
5838 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5840 if (tree_int_cst_equal (TREE_PURPOSE (tail),
5841 constructor_unfilled_index))
5843 output_init_element (TREE_VALUE (tail),
5844 TREE_TYPE (constructor_type),
5845 constructor_unfilled_index, 0);
5848 else if (tree_int_cst_lt (TREE_PURPOSE (tail),
5849 constructor_unfilled_index))
5852 || tree_int_cst_lt (TREE_PURPOSE (tail), next))
5853 next = TREE_PURPOSE (tail);
5855 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5856 || TREE_CODE (constructor_type) == UNION_TYPE)
5858 if (TREE_PURPOSE (tail) == constructor_unfilled_fields)
5860 output_init_element (TREE_VALUE (tail),
5861 TREE_TYPE (constructor_unfilled_fields),
5862 constructor_unfilled_fields,
5866 else if (constructor_unfilled_fields == 0
5867 || tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)),
5868 DECL_FIELD_BITPOS (constructor_unfilled_fields)))
5871 || tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)),
5872 DECL_FIELD_BITPOS (next)))
5873 next = TREE_PURPOSE (tail);
5877 /* Ordinarily return, but not if we want to output all
5878 and there are elements left. */
5879 if (! (all && next != 0))
5882 /* Generate space up to the position of NEXT. */
5883 if (constructor_incremental)
5886 tree nextpos_tree = size_int (0);
5888 if (TREE_CODE (constructor_type) == RECORD_TYPE
5889 || TREE_CODE (constructor_type) == UNION_TYPE)
5891 /* Find the last field written out, if any. */
5892 for (tail = TYPE_FIELDS (constructor_type); tail;
5893 tail = TREE_CHAIN (tail))
5894 if (TREE_CHAIN (tail) == constructor_unfilled_fields)
5898 /* Find the offset of the end of that field. */
5899 filled = size_binop (CEIL_DIV_EXPR,
5900 size_binop (PLUS_EXPR,
5901 DECL_FIELD_BITPOS (tail),
5903 size_int (BITS_PER_UNIT));
5905 filled = size_int (0);
5907 nextpos_tree = size_binop (CEIL_DIV_EXPR,
5908 DECL_FIELD_BITPOS (next),
5909 size_int (BITS_PER_UNIT));
5911 TREE_INT_CST_HIGH (constructor_bit_index)
5912 = TREE_INT_CST_HIGH (DECL_FIELD_BITPOS (next));
5913 TREE_INT_CST_LOW (constructor_bit_index)
5914 = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (next));
5915 constructor_unfilled_fields = next;
5917 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5919 filled = size_binop (MULT_EXPR, constructor_unfilled_index,
5920 size_in_bytes (TREE_TYPE (constructor_type)));
5922 = size_binop (MULT_EXPR, next,
5923 size_in_bytes (TREE_TYPE (constructor_type)));
5924 TREE_INT_CST_LOW (constructor_unfilled_index)
5925 = TREE_INT_CST_LOW (next);
5926 TREE_INT_CST_HIGH (constructor_unfilled_index)
5927 = TREE_INT_CST_HIGH (next);
5934 int nextpos = TREE_INT_CST_LOW (nextpos_tree);
5936 assemble_zeros (nextpos - TREE_INT_CST_LOW (filled));
5941 /* If it's not incremental, just skip over the gap,
5942 so that after jumping to retry we will output the next
5943 successive element. */
5944 if (TREE_CODE (constructor_type) == RECORD_TYPE
5945 || TREE_CODE (constructor_type) == UNION_TYPE)
5946 constructor_unfilled_fields = next;
5947 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5949 TREE_INT_CST_LOW (constructor_unfilled_index)
5950 = TREE_INT_CST_LOW (next);
5951 TREE_INT_CST_HIGH (constructor_unfilled_index)
5952 = TREE_INT_CST_HIGH (next);
5959 /* Add one non-braced element to the current constructor level.
5960 This adjusts the current position within the constructor's type.
5961 This may also start or terminate implicit levels
5962 to handle a partly-braced initializer.
5964 Once this has found the correct level for the new element,
5965 it calls output_init_element.
5967 Note: if we are incrementally outputting this constructor,
5968 this function may be called with a null argument
5969 representing a sub-constructor that was already incrementally output.
5970 When that happens, we output nothing, but we do the bookkeeping
5971 to skip past that element of the current constructor. */
5974 process_init_element (value)
5977 tree orig_value = value;
5978 int string_flag = value != 0 && TREE_CODE (value) == STRING_CST;
5980 /* Handle superfluous braces around string cst as in
5981 char x[] = {"foo"}; */
5984 && TREE_CODE (constructor_type) == ARRAY_TYPE
5985 && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE
5986 && integer_zerop (constructor_unfilled_index))
5988 constructor_stack->replacement_value = value;
5992 if (constructor_stack->replacement_value != 0)
5994 error_init ("excess elements in struct initializer%s",
5995 " after `%s'", NULL_PTR);
5999 /* Ignore elements of a brace group if it is entirely superfluous
6000 and has already been diagnosed. */
6001 if (constructor_type == 0)
6004 /* If we've exhausted any levels that didn't have braces,
6006 while (constructor_stack->implicit)
6008 if ((TREE_CODE (constructor_type) == RECORD_TYPE
6009 || TREE_CODE (constructor_type) == UNION_TYPE)
6010 && constructor_fields == 0)
6011 process_init_element (pop_init_level (1));
6012 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
6013 && tree_int_cst_lt (constructor_max_index, constructor_index))
6014 process_init_element (pop_init_level (1));
6021 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6024 enum tree_code fieldcode;
6026 if (constructor_fields == 0)
6028 pedwarn_init ("excess elements in struct initializer%s",
6029 " after `%s'", NULL_PTR);
6033 fieldtype = TREE_TYPE (constructor_fields);
6034 if (fieldtype != error_mark_node)
6035 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6036 fieldcode = TREE_CODE (fieldtype);
6038 /* Accept a string constant to initialize a subarray. */
6040 && fieldcode == ARRAY_TYPE
6041 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6044 /* Otherwise, if we have come to a subaggregate,
6045 and we don't have an element of its type, push into it. */
6046 else if (value != 0 && !constructor_no_implicit
6047 && value != error_mark_node
6048 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6049 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6050 || fieldcode == UNION_TYPE))
6052 push_init_level (1);
6058 push_member_name (constructor_fields);
6059 output_init_element (value, fieldtype, constructor_fields, 1);
6060 RESTORE_SPELLING_DEPTH (constructor_depth);
6063 /* Do the bookkeeping for an element that was
6064 directly output as a constructor. */
6066 /* For a record, keep track of end position of last field. */
6067 tree temp = size_binop (PLUS_EXPR,
6068 DECL_FIELD_BITPOS (constructor_fields),
6069 DECL_SIZE (constructor_fields));
6070 TREE_INT_CST_LOW (constructor_bit_index)
6071 = TREE_INT_CST_LOW (temp);
6072 TREE_INT_CST_HIGH (constructor_bit_index)
6073 = TREE_INT_CST_HIGH (temp);
6075 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6078 constructor_fields = TREE_CHAIN (constructor_fields);
6079 /* Skip any nameless bit fields atthe beginning. */
6080 while (constructor_fields != 0 && DECL_BIT_FIELD (constructor_fields)
6081 && DECL_NAME (constructor_fields) == 0)
6082 constructor_fields = TREE_CHAIN (constructor_fields);
6085 if (TREE_CODE (constructor_type) == UNION_TYPE)
6088 enum tree_code fieldcode;
6090 if (constructor_fields == 0)
6092 pedwarn_init ("excess elements in union initializer%s",
6093 " after `%s'", NULL_PTR);
6097 fieldtype = TREE_TYPE (constructor_fields);
6098 if (fieldtype != error_mark_node)
6099 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6100 fieldcode = TREE_CODE (fieldtype);
6102 /* Accept a string constant to initialize a subarray. */
6104 && fieldcode == ARRAY_TYPE
6105 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6108 /* Otherwise, if we have come to a subaggregate,
6109 and we don't have an element of its type, push into it. */
6110 else if (value != 0 && !constructor_no_implicit
6111 && value != error_mark_node
6112 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6113 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6114 || fieldcode == UNION_TYPE))
6116 push_init_level (1);
6122 push_member_name (constructor_fields);
6123 output_init_element (value, fieldtype, constructor_fields, 1);
6124 RESTORE_SPELLING_DEPTH (constructor_depth);
6127 /* Do the bookkeeping for an element that was
6128 directly output as a constructor. */
6130 TREE_INT_CST_LOW (constructor_bit_index)
6131 = TREE_INT_CST_LOW (DECL_SIZE (constructor_fields));
6132 TREE_INT_CST_HIGH (constructor_bit_index)
6133 = TREE_INT_CST_HIGH (DECL_SIZE (constructor_fields));
6135 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6138 constructor_fields = 0;
6141 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6143 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6144 enum tree_code eltcode = TREE_CODE (elttype);
6146 /* Accept a string constant to initialize a subarray. */
6148 && eltcode == ARRAY_TYPE
6149 && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE
6152 /* Otherwise, if we have come to a subaggregate,
6153 and we don't have an element of its type, push into it. */
6154 else if (value != 0 && !constructor_no_implicit
6155 && value != error_mark_node
6156 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype
6157 && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
6158 || eltcode == UNION_TYPE))
6160 push_init_level (1);
6164 if (constructor_max_index != 0
6165 && tree_int_cst_lt (constructor_max_index, constructor_index))
6167 pedwarn_init ("excess elements in array initializer%s",
6168 " after `%s'", NULL_PTR);
6172 /* Now output the actual element.
6173 Ordinarily, output once.
6174 If there is a range, repeat it till we advance past the range. */
6181 push_array_bounds (TREE_INT_CST_LOW (constructor_index));
6182 output_init_element (value, elttype, constructor_index, 1);
6183 RESTORE_SPELLING_DEPTH (constructor_depth);
6186 tem = size_binop (PLUS_EXPR, constructor_index,
6188 TREE_INT_CST_LOW (constructor_index)
6189 = TREE_INT_CST_LOW (tem);
6190 TREE_INT_CST_HIGH (constructor_index)
6191 = TREE_INT_CST_HIGH (tem);
6194 /* If we are doing the bookkeeping for an element that was
6195 directly output as a constructor,
6196 we must update constructor_unfilled_index. */
6198 TREE_INT_CST_LOW (constructor_unfilled_index)
6199 = TREE_INT_CST_LOW (constructor_index);
6200 TREE_INT_CST_HIGH (constructor_unfilled_index)
6201 = TREE_INT_CST_HIGH (constructor_index);
6204 while (! (constructor_range_end == 0
6205 || tree_int_cst_lt (constructor_range_end,
6206 constructor_index)));
6211 /* Handle the sole element allowed in a braced initializer
6212 for a scalar variable. */
6213 if (constructor_fields == 0)
6215 pedwarn_init ("excess elements in scalar initializer%s",
6216 " after `%s'", NULL_PTR);
6221 output_init_element (value, constructor_type, NULL_TREE, 1);
6222 constructor_fields = 0;
6226 /* If the (lexically) previous elments are not now saved,
6227 we can discard the storage for them. */
6228 if (constructor_incremental && constructor_pending_elts == 0 && value != 0)
6232 /* Expand an ASM statement with operands, handling output operands
6233 that are not variables or INDIRECT_REFS by transforming such
6234 cases into cases that expand_asm_operands can handle.
6236 Arguments are same as for expand_asm_operands. */
6239 c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
6240 tree string, outputs, inputs, clobbers;
6245 int noutputs = list_length (outputs);
6247 /* o[I] is the place that output number I should be written. */
6248 register tree *o = (tree *) alloca (noutputs * sizeof (tree));
6251 if (TREE_CODE (string) == ADDR_EXPR)
6252 string = TREE_OPERAND (string, 0);
6253 if (TREE_CODE (string) != STRING_CST)
6255 error ("asm template is not a string constant");
6259 /* Record the contents of OUTPUTS before it is modified. */
6260 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6261 o[i] = TREE_VALUE (tail);
6263 /* Perform default conversions on array and function inputs. */
6264 /* Don't do this for other types--
6265 it would screw up operands expected to be in memory. */
6266 for (i = 0, tail = inputs; tail; tail = TREE_CHAIN (tail), i++)
6267 if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE
6268 || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE)
6269 TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail));
6271 /* Generate the ASM_OPERANDS insn;
6272 store into the TREE_VALUEs of OUTPUTS some trees for
6273 where the values were actually stored. */
6274 expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line);
6276 /* Copy all the intermediate outputs into the specified outputs. */
6277 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6279 if (o[i] != TREE_VALUE (tail))
6281 expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
6285 /* Detect modification of read-only values.
6286 (Otherwise done by build_modify_expr.) */
6289 tree type = TREE_TYPE (o[i]);
6290 if (TYPE_READONLY (type)
6291 || ((TREE_CODE (type) == RECORD_TYPE
6292 || TREE_CODE (type) == UNION_TYPE)
6293 && C_TYPE_FIELDS_READONLY (type)))
6294 readonly_warning (o[i], "modification by `asm'");
6298 /* Those MODIFY_EXPRs could do autoincrements. */
6302 /* Expand a C `return' statement.
6303 RETVAL is the expression for what to return,
6304 or a null pointer for `return;' with no value. */
6307 c_expand_return (retval)
6310 tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
6312 if (TREE_THIS_VOLATILE (current_function_decl))
6313 warning ("function declared `noreturn' has a `return' statement");
6317 current_function_returns_null = 1;
6318 if (warn_return_type && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
6319 warning ("`return' with no value, in function returning non-void");
6320 expand_null_return ();
6322 else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
6324 current_function_returns_null = 1;
6325 if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
6326 pedwarn ("`return' with a value, in function returning void");
6327 expand_return (retval);
6331 tree t = convert_for_assignment (valtype, retval, "return",
6332 NULL_TREE, NULL_TREE, 0);
6333 tree res = DECL_RESULT (current_function_decl);
6336 if (t == error_mark_node)
6339 inner = t = convert (TREE_TYPE (res), t);
6341 /* Strip any conversions, additions, and subtractions, and see if
6342 we are returning the address of a local variable. Warn if so. */
6343 while (TREE_CODE (inner) == NOP_EXPR
6344 || TREE_CODE (inner) == NON_LVALUE_EXPR
6345 || TREE_CODE (inner) == CONVERT_EXPR
6346 || TREE_CODE (inner) == PLUS_EXPR
6347 || TREE_CODE (inner) == MINUS_EXPR)
6348 inner = TREE_OPERAND (inner, 0);
6350 if (TREE_CODE (inner) == ADDR_EXPR)
6352 inner = TREE_OPERAND (inner, 0);
6354 while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r')
6355 inner = TREE_OPERAND (inner, 0);
6357 if (TREE_CODE (inner) == VAR_DECL
6358 && ! DECL_EXTERNAL (inner)
6359 && ! TREE_STATIC (inner)
6360 && DECL_CONTEXT (inner) == current_function_decl)
6361 warning ("function returns address of local variable");
6364 t = build (MODIFY_EXPR, TREE_TYPE (res), res, t);
6365 TREE_SIDE_EFFECTS (t) = 1;
6367 current_function_returns_value = 1;
6371 /* Start a C switch statement, testing expression EXP.
6372 Return EXP if it is valid, an error node otherwise. */
6375 c_expand_start_case (exp)
6378 register enum tree_code code = TREE_CODE (TREE_TYPE (exp));
6379 tree type = TREE_TYPE (exp);
6381 if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK)
6383 error ("switch quantity not an integer");
6384 exp = error_mark_node;
6389 type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
6391 if (warn_traditional
6392 && (type == long_integer_type_node
6393 || type == long_unsigned_type_node))
6394 pedwarn ("`long' switch expression not converted to `int' in ANSI C");
6396 exp = default_conversion (exp);
6397 type = TREE_TYPE (exp);
6398 index = get_unwidened (exp, NULL_TREE);
6399 /* We can't strip a conversion from a signed type to an unsigned,
6400 because if we did, int_fits_type_p would do the wrong thing
6401 when checking case values for being in range,
6402 and it's too hard to do the right thing. */
6403 if (TREE_UNSIGNED (TREE_TYPE (exp))
6404 == TREE_UNSIGNED (TREE_TYPE (index)))
6408 expand_start_case (1, exp, type, "switch statement");