1 /* Build expressions with type checking for C compiler.
2 Copyright (C) 1987, 88, 91-97, 1998 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* This file is part of the C front end.
23 It contains routines to build C expressions given their operands,
24 including computing the types of the result, C-specific error checks,
25 and some optimization.
27 There are also routines to build RETURN_STMT nodes and CASE_STMT nodes,
28 and to process initializations in declarations (since they work
29 like a strange sort of assignment). */
41 /* Nonzero if we've already printed a "missing braces around initializer"
42 message within this initializer. */
43 static int missing_braces_mentioned;
45 static tree qualify_type PROTO((tree, tree));
46 static int comp_target_types PROTO((tree, tree));
47 static int function_types_compatible_p PROTO((tree, tree));
48 static int type_lists_compatible_p PROTO((tree, tree));
49 static int self_promoting_type_p PROTO((tree));
50 static tree decl_constant_value PROTO((tree));
51 static tree lookup_field PROTO((tree, tree, tree *));
52 static tree convert_arguments PROTO((tree, tree, tree, tree));
53 static tree pointer_int_sum PROTO((enum tree_code, tree, tree));
54 static tree pointer_diff PROTO((tree, tree));
55 static tree unary_complex_lvalue PROTO((enum tree_code, tree));
56 static void pedantic_lvalue_warning PROTO((enum tree_code));
57 static tree internal_build_compound_expr PROTO((tree, int));
58 static tree convert_for_assignment PROTO((tree, tree, char *, tree,
60 static void warn_for_assignment PROTO((char *, char *, tree, int));
61 static tree valid_compound_expr_initializer PROTO((tree, tree));
62 static void push_string PROTO((char *));
63 static void push_member_name PROTO((tree));
64 static void push_array_bounds PROTO((int));
65 static int spelling_length PROTO((void));
66 static char *print_spelling PROTO((char *));
67 static char *get_spelling PROTO((char *));
68 static void warning_init PROTO((char *, char *,
70 static tree digest_init PROTO((tree, tree, int, int));
71 static void check_init_type_bitfields PROTO((tree));
72 static void output_init_element PROTO((tree, tree, tree, int));
73 static void output_pending_init_elements PROTO((int));
74 static void add_pending_init PROTO((tree, tree));
75 static int pending_init_member PROTO((tree));
77 /* Do `exp = require_complete_type (exp);' to make sure exp
78 does not have an incomplete type. (That includes void types.) */
81 require_complete_type (value)
84 tree type = TREE_TYPE (value);
86 /* First, detect a valid value with a complete type. */
87 if (TYPE_SIZE (type) != 0
88 && type != void_type_node)
91 incomplete_type_error (value, type);
92 return error_mark_node;
95 /* Print an error message for invalid use of an incomplete type.
96 VALUE is the expression that was used (or 0 if that isn't known)
97 and TYPE is the type that was invalid. */
100 incomplete_type_error (value, type)
106 /* Avoid duplicate error message. */
107 if (TREE_CODE (type) == ERROR_MARK)
110 if (value != 0 && (TREE_CODE (value) == VAR_DECL
111 || TREE_CODE (value) == PARM_DECL))
112 error ("`%s' has an incomplete type",
113 IDENTIFIER_POINTER (DECL_NAME (value)));
117 /* We must print an error message. Be clever about what it says. */
119 switch (TREE_CODE (type))
122 errmsg = "invalid use of undefined type `struct %s'";
126 errmsg = "invalid use of undefined type `union %s'";
130 errmsg = "invalid use of undefined type `enum %s'";
134 error ("invalid use of void expression");
138 if (TYPE_DOMAIN (type))
140 type = TREE_TYPE (type);
143 error ("invalid use of array with unspecified bounds");
150 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
151 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
153 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
154 error ("invalid use of incomplete typedef `%s'",
155 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
159 /* Return a variant of TYPE which has all the type qualifiers of LIKE
160 as well as those of TYPE. */
163 qualify_type (type, like)
166 int constflag = TYPE_READONLY (type) || TYPE_READONLY (like);
167 int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like);
168 return c_build_type_variant (type, constflag, volflag);
171 /* Return the common type of two types.
172 We assume that comptypes has already been done and returned 1;
173 if that isn't so, this may crash. In particular, we assume that qualifiers
176 This is the type for the result of most arithmetic operations
177 if the operands have the given two types. */
183 register enum tree_code code1;
184 register enum tree_code code2;
187 /* Save time if the two types are the same. */
189 if (t1 == t2) return t1;
191 /* If one type is nonsense, use the other. */
192 if (t1 == error_mark_node)
194 if (t2 == error_mark_node)
197 /* Merge the attributes. */
198 attributes = merge_machine_type_attributes (t1, t2);
200 /* Treat an enum type as the unsigned integer type of the same width. */
202 if (TREE_CODE (t1) == ENUMERAL_TYPE)
203 t1 = type_for_size (TYPE_PRECISION (t1), 1);
204 if (TREE_CODE (t2) == ENUMERAL_TYPE)
205 t2 = type_for_size (TYPE_PRECISION (t2), 1);
207 code1 = TREE_CODE (t1);
208 code2 = TREE_CODE (t2);
210 /* If one type is complex, form the common type of the non-complex
211 components, then make that complex. Use T1 or T2 if it is the
213 if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE)
215 tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1;
216 tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2;
217 tree subtype = common_type (subtype1, subtype2);
219 if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype)
220 return build_type_attribute_variant (t1, attributes);
221 else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype)
222 return build_type_attribute_variant (t2, attributes);
224 return build_type_attribute_variant (build_complex_type (subtype),
232 /* If only one is real, use it as the result. */
234 if (code1 == REAL_TYPE && code2 != REAL_TYPE)
235 return build_type_attribute_variant (t1, attributes);
237 if (code2 == REAL_TYPE && code1 != REAL_TYPE)
238 return build_type_attribute_variant (t2, attributes);
240 /* Both real or both integers; use the one with greater precision. */
242 if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2))
243 return build_type_attribute_variant (t1, attributes);
244 else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1))
245 return build_type_attribute_variant (t2, attributes);
247 /* Same precision. Prefer longs to ints even when same size. */
249 if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node
250 || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node)
251 return build_type_attribute_variant (long_unsigned_type_node,
254 if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node
255 || TYPE_MAIN_VARIANT (t2) == long_integer_type_node)
257 /* But preserve unsignedness from the other type,
258 since long cannot hold all the values of an unsigned int. */
259 if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2))
260 t1 = long_unsigned_type_node;
262 t1 = long_integer_type_node;
263 return build_type_attribute_variant (t1, attributes);
266 /* Likewise, prefer long double to double even if same size. */
267 if (TYPE_MAIN_VARIANT (t1) == long_double_type_node
268 || TYPE_MAIN_VARIANT (t2) == long_double_type_node)
269 return build_type_attribute_variant (long_double_type_node,
272 /* Otherwise prefer the unsigned one. */
274 if (TREE_UNSIGNED (t1))
275 return build_type_attribute_variant (t1, attributes);
277 return build_type_attribute_variant (t2, attributes);
280 /* For two pointers, do this recursively on the target type,
281 and combine the qualifiers of the two types' targets. */
282 /* This code was turned off; I don't know why.
283 But ANSI C specifies doing this with the qualifiers.
284 So I turned it on again. */
286 tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)),
287 TYPE_MAIN_VARIANT (TREE_TYPE (t2)));
289 = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2));
291 = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2));
292 t1 = build_pointer_type (c_build_type_variant (target, constp,
294 return build_type_attribute_variant (t1, attributes);
297 t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2)));
298 return build_type_attribute_variant (t1, attributes);
303 tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
304 /* Save space: see if the result is identical to one of the args. */
305 if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1))
306 return build_type_attribute_variant (t1, attributes);
307 if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2))
308 return build_type_attribute_variant (t2, attributes);
309 /* Merge the element types, and have a size if either arg has one. */
310 t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2));
311 return build_type_attribute_variant (t1, attributes);
315 /* Function types: prefer the one that specified arg types.
316 If both do, merge the arg types. Also merge the return types. */
318 tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2));
319 tree p1 = TYPE_ARG_TYPES (t1);
320 tree p2 = TYPE_ARG_TYPES (t2);
325 /* Save space: see if the result is identical to one of the args. */
326 if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2))
327 return build_type_attribute_variant (t1, attributes);
328 if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1))
329 return build_type_attribute_variant (t2, attributes);
331 /* Simple way if one arg fails to specify argument types. */
332 if (TYPE_ARG_TYPES (t1) == 0)
334 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2));
335 return build_type_attribute_variant (t1, attributes);
337 if (TYPE_ARG_TYPES (t2) == 0)
339 t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1));
340 return build_type_attribute_variant (t1, attributes);
343 /* If both args specify argument types, we must merge the two
344 lists, argument by argument. */
346 len = list_length (p1);
349 for (i = 0; i < len; i++)
350 newargs = tree_cons (NULL_TREE, NULL_TREE, newargs);
355 p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n))
357 /* A null type means arg type is not specified.
358 Take whatever the other function type has. */
359 if (TREE_VALUE (p1) == 0)
361 TREE_VALUE (n) = TREE_VALUE (p2);
364 if (TREE_VALUE (p2) == 0)
366 TREE_VALUE (n) = TREE_VALUE (p1);
370 /* Given wait (union {union wait *u; int *i} *)
371 and wait (union wait *),
372 prefer union wait * as type of parm. */
373 if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE
374 && TREE_VALUE (p1) != TREE_VALUE (p2))
377 for (memb = TYPE_FIELDS (TREE_VALUE (p1));
378 memb; memb = TREE_CHAIN (memb))
379 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2)))
381 TREE_VALUE (n) = TREE_VALUE (p2);
383 pedwarn ("function types not truly compatible in ANSI C");
387 if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE
388 && TREE_VALUE (p2) != TREE_VALUE (p1))
391 for (memb = TYPE_FIELDS (TREE_VALUE (p2));
392 memb; memb = TREE_CHAIN (memb))
393 if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1)))
395 TREE_VALUE (n) = TREE_VALUE (p1);
397 pedwarn ("function types not truly compatible in ANSI C");
401 TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2));
405 t1 = build_function_type (valtype, newargs);
406 /* ... falls through ... */
410 return build_type_attribute_variant (t1, attributes);
415 /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment
416 or various other operations. Return 2 if they are compatible
417 but a warning may be needed if you use them together. */
420 comptypes (type1, type2)
423 register tree t1 = type1;
424 register tree t2 = type2;
427 /* Suppress errors caused by previously reported errors. */
429 if (t1 == t2 || !t1 || !t2
430 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK)
433 /* Treat an enum type as the integer type of the same width and
436 if (TREE_CODE (t1) == ENUMERAL_TYPE)
437 t1 = type_for_size (TYPE_PRECISION (t1), TREE_UNSIGNED (t1));
438 if (TREE_CODE (t2) == ENUMERAL_TYPE)
439 t2 = type_for_size (TYPE_PRECISION (t2), TREE_UNSIGNED (t2));
444 /* Different classes of types can't be compatible. */
446 if (TREE_CODE (t1) != TREE_CODE (t2)) return 0;
448 /* Qualifiers must match. */
450 if (TYPE_READONLY (t1) != TYPE_READONLY (t2))
452 if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2))
455 /* Allow for two different type nodes which have essentially the same
456 definition. Note that we already checked for equality of the type
457 qualifiers (just above). */
459 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
462 #ifndef COMP_TYPE_ATTRIBUTES
463 #define COMP_TYPE_ATTRIBUTES(t1,t2) 1
466 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
467 if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2)))
470 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
473 switch (TREE_CODE (t1))
476 val = (TREE_TYPE (t1) == TREE_TYPE (t2)
477 ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2)));
481 val = function_types_compatible_p (t1, t2);
486 tree d1 = TYPE_DOMAIN (t1);
487 tree d2 = TYPE_DOMAIN (t2);
490 /* Target types must match incl. qualifiers. */
491 if (TREE_TYPE (t1) != TREE_TYPE (t2)
492 && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2))))
495 /* Sizes must match unless one is missing or variable. */
496 if (d1 == 0 || d2 == 0 || d1 == d2
497 || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
498 || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
499 || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST
500 || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)
503 if (! ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1))
504 == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2)))
505 && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1))
506 == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2)))
507 && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1))
508 == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2)))
509 && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1))
510 == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))))
516 if (maybe_objc_comptypes (t1, t2, 0) == 1)
523 return attrval == 2 && val == 1 ? 2 : val;
526 /* Return 1 if TTL and TTR are pointers to types that are equivalent,
527 ignoring their qualifiers. */
530 comp_target_types (ttl, ttr)
535 /* Give maybe_objc_comptypes a crack at letting these types through. */
536 if ((val = maybe_objc_comptypes (ttl, ttr, 1)) >= 0)
539 val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
540 TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
542 if (val == 2 && pedantic)
543 pedwarn ("types are not quite compatible");
547 /* Subroutines of `comptypes'. */
549 /* Return 1 if two function types F1 and F2 are compatible.
550 If either type specifies no argument types,
551 the other must specify a fixed number of self-promoting arg types.
552 Otherwise, if one type specifies only the number of arguments,
553 the other must specify that number of self-promoting arg types.
554 Otherwise, the argument types must match. */
557 function_types_compatible_p (f1, f2)
561 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
565 if (!(TREE_TYPE (f1) == TREE_TYPE (f2)
566 || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2)))))
569 args1 = TYPE_ARG_TYPES (f1);
570 args2 = TYPE_ARG_TYPES (f2);
572 /* An unspecified parmlist matches any specified parmlist
573 whose argument types don't need default promotions. */
577 if (!self_promoting_args_p (args2))
579 /* If one of these types comes from a non-prototype fn definition,
580 compare that with the other type's arglist.
581 If they don't match, ask for a warning (but no error). */
582 if (TYPE_ACTUAL_ARG_TYPES (f1)
583 && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1)))
589 if (!self_promoting_args_p (args1))
591 if (TYPE_ACTUAL_ARG_TYPES (f2)
592 && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2)))
597 /* Both types have argument lists: compare them and propagate results. */
598 val1 = type_lists_compatible_p (args1, args2);
599 return val1 != 1 ? val1 : val;
602 /* Check two lists of types for compatibility,
603 returning 0 for incompatible, 1 for compatible,
604 or 2 for compatible with warning. */
607 type_lists_compatible_p (args1, args2)
610 /* 1 if no need for warning yet, 2 if warning cause has been seen. */
616 if (args1 == 0 && args2 == 0)
618 /* If one list is shorter than the other,
619 they fail to match. */
620 if (args1 == 0 || args2 == 0)
622 /* A null pointer instead of a type
623 means there is supposed to be an argument
624 but nothing is specified about what type it has.
625 So match anything that self-promotes. */
626 if (TREE_VALUE (args1) == 0)
628 if (! self_promoting_type_p (TREE_VALUE (args2)))
631 else if (TREE_VALUE (args2) == 0)
633 if (! self_promoting_type_p (TREE_VALUE (args1)))
636 else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2))))
638 /* Allow wait (union {union wait *u; int *i} *)
639 and wait (union wait *) to be compatible. */
640 if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE
641 && (TYPE_NAME (TREE_VALUE (args1)) == 0
642 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args1)))
643 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST
644 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)),
645 TYPE_SIZE (TREE_VALUE (args2))))
648 for (memb = TYPE_FIELDS (TREE_VALUE (args1));
649 memb; memb = TREE_CHAIN (memb))
650 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2)))
655 else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE
656 && (TYPE_NAME (TREE_VALUE (args2)) == 0
657 || TYPE_TRANSPARENT_UNION (TREE_VALUE (args2)))
658 && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST
659 && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)),
660 TYPE_SIZE (TREE_VALUE (args1))))
663 for (memb = TYPE_FIELDS (TREE_VALUE (args2));
664 memb; memb = TREE_CHAIN (memb))
665 if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1)))
674 /* comptypes said ok, but record if it said to warn. */
678 args1 = TREE_CHAIN (args1);
679 args2 = TREE_CHAIN (args2);
683 /* Return 1 if PARMS specifies a fixed number of parameters
684 and none of their types is affected by default promotions. */
687 self_promoting_args_p (parms)
691 for (t = parms; t; t = TREE_CHAIN (t))
693 register tree type = TREE_VALUE (t);
695 if (TREE_CHAIN (t) == 0 && type != void_type_node)
701 if (TYPE_MAIN_VARIANT (type) == float_type_node)
704 if (C_PROMOTING_INTEGER_TYPE_P (type))
710 /* Return 1 if TYPE is not affected by default promotions. */
713 self_promoting_type_p (type)
716 if (TYPE_MAIN_VARIANT (type) == float_type_node)
719 if (C_PROMOTING_INTEGER_TYPE_P (type))
725 /* Return an unsigned type the same as TYPE in other respects. */
731 tree type1 = TYPE_MAIN_VARIANT (type);
732 if (type1 == signed_char_type_node || type1 == char_type_node)
733 return unsigned_char_type_node;
734 if (type1 == integer_type_node)
735 return unsigned_type_node;
736 if (type1 == short_integer_type_node)
737 return short_unsigned_type_node;
738 if (type1 == long_integer_type_node)
739 return long_unsigned_type_node;
740 if (type1 == long_long_integer_type_node)
741 return long_long_unsigned_type_node;
742 if (type1 == intDI_type_node)
743 return unsigned_intDI_type_node;
744 if (type1 == intSI_type_node)
745 return unsigned_intSI_type_node;
746 if (type1 == intHI_type_node)
747 return unsigned_intHI_type_node;
748 if (type1 == intQI_type_node)
749 return unsigned_intQI_type_node;
751 return signed_or_unsigned_type (1, type);
754 /* Return a signed type the same as TYPE in other respects. */
760 tree type1 = TYPE_MAIN_VARIANT (type);
761 if (type1 == unsigned_char_type_node || type1 == char_type_node)
762 return signed_char_type_node;
763 if (type1 == unsigned_type_node)
764 return integer_type_node;
765 if (type1 == short_unsigned_type_node)
766 return short_integer_type_node;
767 if (type1 == long_unsigned_type_node)
768 return long_integer_type_node;
769 if (type1 == long_long_unsigned_type_node)
770 return long_long_integer_type_node;
771 if (type1 == unsigned_intDI_type_node)
772 return intDI_type_node;
773 if (type1 == unsigned_intSI_type_node)
774 return intSI_type_node;
775 if (type1 == unsigned_intHI_type_node)
776 return intHI_type_node;
777 if (type1 == unsigned_intQI_type_node)
778 return intQI_type_node;
780 return signed_or_unsigned_type (0, type);
783 /* Return a type the same as TYPE except unsigned or
784 signed according to UNSIGNEDP. */
787 signed_or_unsigned_type (unsignedp, type)
791 if ((! INTEGRAL_TYPE_P (type) && ! POINTER_TYPE_P (type))
792 || TREE_UNSIGNED (type) == unsignedp)
794 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
795 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
796 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
797 return unsignedp ? unsigned_type_node : integer_type_node;
798 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
799 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
800 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
801 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
802 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
803 return (unsignedp ? long_long_unsigned_type_node
804 : long_long_integer_type_node);
808 /* Compute the value of the `sizeof' operator. */
814 enum tree_code code = TREE_CODE (type);
817 if (code == FUNCTION_TYPE)
819 if (pedantic || warn_pointer_arith)
820 pedwarn ("sizeof applied to a function type");
823 if (code == VOID_TYPE)
825 if (pedantic || warn_pointer_arith)
826 pedwarn ("sizeof applied to a void type");
829 if (code == ERROR_MARK)
831 if (TYPE_SIZE (type) == 0)
833 error ("sizeof applied to an incomplete type");
837 /* Convert in case a char is more than one unit. */
838 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
839 size_int (TYPE_PRECISION (char_type_node)));
840 t = convert (sizetype, t);
841 /* size_binop does not put the constant in range, so do it now. */
842 if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0))
843 TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1;
848 c_sizeof_nowarn (type)
851 enum tree_code code = TREE_CODE (type);
854 if (code == FUNCTION_TYPE
856 || code == ERROR_MARK)
858 if (TYPE_SIZE (type) == 0)
861 /* Convert in case a char is more than one unit. */
862 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
863 size_int (TYPE_PRECISION (char_type_node)));
864 t = convert (sizetype, t);
865 force_fit_type (t, 0);
869 /* Compute the size to increment a pointer by. */
872 c_size_in_bytes (type)
875 enum tree_code code = TREE_CODE (type);
878 if (code == FUNCTION_TYPE)
880 if (code == VOID_TYPE)
882 if (code == ERROR_MARK)
884 if (TYPE_SIZE (type) == 0)
886 error ("arithmetic on pointer to an incomplete type");
890 /* Convert in case a char is more than one unit. */
891 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
892 size_int (BITS_PER_UNIT));
893 t = convert (sizetype, t);
894 force_fit_type (t, 0);
898 /* Implement the __alignof keyword: Return the minimum required
899 alignment of TYPE, measured in bytes. */
905 enum tree_code code = TREE_CODE (type);
907 if (code == FUNCTION_TYPE)
908 return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
910 if (code == VOID_TYPE || code == ERROR_MARK)
913 return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
916 /* Implement the __alignof keyword: Return the minimum required
917 alignment of EXPR, measured in bytes. For VAR_DECL's and
918 FIELD_DECL's return DECL_ALIGN (which can be set from an
919 "aligned" __attribute__ specification). */
922 c_alignof_expr (expr)
925 if (TREE_CODE (expr) == VAR_DECL)
926 return size_int (DECL_ALIGN (expr) / BITS_PER_UNIT);
928 if (TREE_CODE (expr) == COMPONENT_REF
929 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
931 error ("`__alignof' applied to a bit-field");
934 else if (TREE_CODE (expr) == COMPONENT_REF
935 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
936 return size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT);
938 if (TREE_CODE (expr) == INDIRECT_REF)
940 tree t = TREE_OPERAND (expr, 0);
942 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
944 while (TREE_CODE (t) == NOP_EXPR
945 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
949 t = TREE_OPERAND (t, 0);
950 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
951 if (thisalign > bestalign)
952 best = t, bestalign = thisalign;
954 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
957 return c_alignof (TREE_TYPE (expr));
960 /* Return either DECL or its known constant value (if it has one). */
963 decl_constant_value (decl)
966 if (/* Don't change a variable array bound or initial value to a constant
967 in a place where a variable is invalid. */
968 current_function_decl != 0
970 && ! TREE_THIS_VOLATILE (decl)
971 && TREE_READONLY (decl) && ! ITERATOR_P (decl)
972 && DECL_INITIAL (decl) != 0
973 && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK
974 /* This is invalid if initial value is not constant.
975 If it has either a function call, a memory reference,
976 or a variable, then re-evaluating it could give different results. */
977 && TREE_CONSTANT (DECL_INITIAL (decl))
978 /* Check for cases where this is sub-optimal, even though valid. */
979 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR
980 && DECL_MODE (decl) != BLKmode)
981 return DECL_INITIAL (decl);
985 /* Perform default promotions for C data used in expressions.
986 Arrays and functions are converted to pointers;
987 enumeral types or short or char, to int.
988 In addition, manifest constants symbols are replaced by their values. */
991 default_conversion (exp)
994 register tree type = TREE_TYPE (exp);
995 register enum tree_code code = TREE_CODE (type);
997 /* Constants can be used directly unless they're not loadable. */
998 if (TREE_CODE (exp) == CONST_DECL)
999 exp = DECL_INITIAL (exp);
1001 /* Replace a nonvolatile const static variable with its value unless
1002 it is an array, in which case we must be sure that taking the
1003 address of the array produces consistent results. */
1004 else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE)
1006 exp = decl_constant_value (exp);
1007 type = TREE_TYPE (exp);
1010 /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as
1012 /* Do not use STRIP_NOPS here! It will remove conversions from pointer
1013 to integer and cause infinite recursion. */
1014 while (TREE_CODE (exp) == NON_LVALUE_EXPR
1015 || (TREE_CODE (exp) == NOP_EXPR
1016 && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp)))
1017 exp = TREE_OPERAND (exp, 0);
1019 /* Normally convert enums to int,
1020 but convert wide enums to something wider. */
1021 if (code == ENUMERAL_TYPE)
1023 type = type_for_size (MAX (TYPE_PRECISION (type),
1024 TYPE_PRECISION (integer_type_node)),
1026 || (TYPE_PRECISION (type)
1027 >= TYPE_PRECISION (integer_type_node)))
1028 && TREE_UNSIGNED (type)));
1029 return convert (type, exp);
1032 if (TREE_CODE (exp) == COMPONENT_REF
1033 && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1)))
1035 tree width = DECL_SIZE (TREE_OPERAND (exp, 1));
1036 HOST_WIDE_INT low = TREE_INT_CST_LOW (width);
1038 /* If it's thinner than an int, promote it like a
1039 C_PROMOTING_INTEGER_TYPE_P, otherwise leave it alone. */
1041 if (low < TYPE_PRECISION (integer_type_node))
1043 if (flag_traditional && TREE_UNSIGNED (type))
1044 return convert (unsigned_type_node, exp);
1046 return convert (integer_type_node, exp);
1050 if (C_PROMOTING_INTEGER_TYPE_P (type))
1052 /* Traditionally, unsignedness is preserved in default promotions.
1053 Also preserve unsignedness if not really getting any wider. */
1054 if (TREE_UNSIGNED (type)
1055 && (flag_traditional
1056 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
1057 return convert (unsigned_type_node, exp);
1058 return convert (integer_type_node, exp);
1060 if (flag_traditional && !flag_allow_single_precision
1061 && TYPE_MAIN_VARIANT (type) == float_type_node)
1062 return convert (double_type_node, exp);
1063 if (code == VOID_TYPE)
1065 error ("void value not ignored as it ought to be");
1066 return error_mark_node;
1068 if (code == FUNCTION_TYPE)
1070 return build_unary_op (ADDR_EXPR, exp, 0);
1072 if (code == ARRAY_TYPE)
1075 tree restype = TREE_TYPE (type);
1080 if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r'
1081 || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
1083 constp = TREE_READONLY (exp);
1084 volatilep = TREE_THIS_VOLATILE (exp);
1087 if (TYPE_READONLY (type) || TYPE_VOLATILE (type)
1088 || constp || volatilep)
1089 restype = c_build_type_variant (restype,
1090 TYPE_READONLY (type) || constp,
1091 TYPE_VOLATILE (type) || volatilep);
1093 if (TREE_CODE (exp) == INDIRECT_REF)
1094 return convert (TYPE_POINTER_TO (restype),
1095 TREE_OPERAND (exp, 0));
1097 if (TREE_CODE (exp) == COMPOUND_EXPR)
1099 tree op1 = default_conversion (TREE_OPERAND (exp, 1));
1100 return build (COMPOUND_EXPR, TREE_TYPE (op1),
1101 TREE_OPERAND (exp, 0), op1);
1104 if (! lvalue_p (exp)
1105 && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp)))
1107 error ("invalid use of non-lvalue array");
1108 return error_mark_node;
1111 ptrtype = build_pointer_type (restype);
1113 if (TREE_CODE (exp) == VAR_DECL)
1115 /* ??? This is not really quite correct
1116 in that the type of the operand of ADDR_EXPR
1117 is not the target type of the type of the ADDR_EXPR itself.
1118 Question is, can this lossage be avoided? */
1119 adr = build1 (ADDR_EXPR, ptrtype, exp);
1120 if (mark_addressable (exp) == 0)
1121 return error_mark_node;
1122 TREE_CONSTANT (adr) = staticp (exp);
1123 TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */
1126 /* This way is better for a COMPONENT_REF since it can
1127 simplify the offset for a component. */
1128 adr = build_unary_op (ADDR_EXPR, exp, 1);
1129 return convert (ptrtype, adr);
1134 /* Look up component name in the structure type definition.
1136 If this component name is found indirectly within an anonymous union,
1137 store in *INDIRECT the component which directly contains
1138 that anonymous union. Otherwise, set *INDIRECT to 0. */
1141 lookup_field (type, component, indirect)
1142 tree type, component;
1147 /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers
1148 to the field elements. Use a binary search on this array to quickly
1149 find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC
1150 will always be set for structures which have many elements. */
1152 if (TYPE_LANG_SPECIFIC (type))
1155 tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0];
1157 field = TYPE_FIELDS (type);
1159 top = TYPE_LANG_SPECIFIC (type)->len;
1160 while (top - bot > 1)
1162 half = (top - bot + 1) >> 1;
1163 field = field_array[bot+half];
1165 if (DECL_NAME (field) == NULL_TREE)
1167 /* Step through all anon unions in linear fashion. */
1168 while (DECL_NAME (field_array[bot]) == NULL_TREE)
1170 tree anon = 0, junk;
1172 field = field_array[bot++];
1173 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1174 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1175 anon = lookup_field (TREE_TYPE (field), component, &junk);
1177 if (anon != NULL_TREE)
1184 /* Entire record is only anon unions. */
1188 /* Restart the binary search, with new lower bound. */
1192 if (DECL_NAME (field) == component)
1194 if (DECL_NAME (field) < component)
1200 if (DECL_NAME (field_array[bot]) == component)
1201 field = field_array[bot];
1202 else if (DECL_NAME (field) != component)
1207 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1209 if (DECL_NAME (field) == NULL_TREE)
1214 if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE
1215 || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)
1216 anon = lookup_field (TREE_TYPE (field), component, &junk);
1218 if (anon != NULL_TREE)
1225 if (DECL_NAME (field) == component)
1230 *indirect = NULL_TREE;
1234 /* Make an expression to refer to the COMPONENT field of
1235 structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */
1238 build_component_ref (datum, component)
1239 tree datum, component;
1241 register tree type = TREE_TYPE (datum);
1242 register enum tree_code code = TREE_CODE (type);
1243 register tree field = NULL;
1246 /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it
1247 unless we are not to support things not strictly ANSI. */
1248 switch (TREE_CODE (datum))
1252 tree value = build_component_ref (TREE_OPERAND (datum, 1), component);
1253 return build (COMPOUND_EXPR, TREE_TYPE (value),
1254 TREE_OPERAND (datum, 0), value);
1257 return build_conditional_expr
1258 (TREE_OPERAND (datum, 0),
1259 build_component_ref (TREE_OPERAND (datum, 1), component),
1260 build_component_ref (TREE_OPERAND (datum, 2), component));
1266 /* See if there is a field or component with name COMPONENT. */
1268 if (code == RECORD_TYPE || code == UNION_TYPE)
1272 if (TYPE_SIZE (type) == 0)
1274 incomplete_type_error (NULL_TREE, type);
1275 return error_mark_node;
1278 field = lookup_field (type, component, &indirect);
1282 error (code == RECORD_TYPE
1283 ? "structure has no member named `%s'"
1284 : "union has no member named `%s'",
1285 IDENTIFIER_POINTER (component));
1286 return error_mark_node;
1288 if (TREE_TYPE (field) == error_mark_node)
1289 return error_mark_node;
1291 /* If FIELD was found buried within an anonymous union,
1292 make one COMPONENT_REF to get that anonymous union,
1293 then fall thru to make a second COMPONENT_REF to get FIELD. */
1296 ref = build (COMPONENT_REF, TREE_TYPE (indirect), datum, indirect);
1297 if (TREE_READONLY (datum) || TREE_READONLY (indirect))
1298 TREE_READONLY (ref) = 1;
1299 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (indirect))
1300 TREE_THIS_VOLATILE (ref) = 1;
1304 ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field);
1306 if (TREE_READONLY (datum) || TREE_READONLY (field))
1307 TREE_READONLY (ref) = 1;
1308 if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field))
1309 TREE_THIS_VOLATILE (ref) = 1;
1313 else if (code != ERROR_MARK)
1314 error ("request for member `%s' in something not a structure or union",
1315 IDENTIFIER_POINTER (component));
1317 return error_mark_node;
1320 /* Given an expression PTR for a pointer, return an expression
1321 for the value pointed to.
1322 ERRORSTRING is the name of the operator to appear in error messages. */
1325 build_indirect_ref (ptr, errorstring)
1329 register tree pointer = default_conversion (ptr);
1330 register tree type = TREE_TYPE (pointer);
1332 if (TREE_CODE (type) == POINTER_TYPE)
1334 if (TREE_CODE (pointer) == ADDR_EXPR
1336 && (TREE_TYPE (TREE_OPERAND (pointer, 0))
1337 == TREE_TYPE (type)))
1338 return TREE_OPERAND (pointer, 0);
1341 tree t = TREE_TYPE (type);
1342 register tree ref = build1 (INDIRECT_REF,
1343 TYPE_MAIN_VARIANT (t), pointer);
1345 if (TYPE_SIZE (t) == 0 && TREE_CODE (t) != ARRAY_TYPE)
1347 error ("dereferencing pointer to incomplete type");
1348 return error_mark_node;
1350 if (TREE_CODE (t) == VOID_TYPE && skip_evaluation == 0)
1351 warning ("dereferencing `void *' pointer");
1353 /* We *must* set TREE_READONLY when dereferencing a pointer to const,
1354 so that we get the proper error message if the result is used
1355 to assign to. Also, &* is supposed to be a no-op.
1356 And ANSI C seems to specify that the type of the result
1357 should be the const type. */
1358 /* A de-reference of a pointer to const is not a const. It is valid
1359 to change it via some other pointer. */
1360 TREE_READONLY (ref) = TYPE_READONLY (t);
1361 TREE_SIDE_EFFECTS (ref)
1362 = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile;
1363 TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t);
1367 else if (TREE_CODE (pointer) != ERROR_MARK)
1368 error ("invalid type argument of `%s'", errorstring);
1369 return error_mark_node;
1372 /* This handles expressions of the form "a[i]", which denotes
1375 This is logically equivalent in C to *(a+i), but we may do it differently.
1376 If A is a variable or a member, we generate a primitive ARRAY_REF.
1377 This avoids forcing the array out of registers, and can work on
1378 arrays that are not lvalues (for example, members of structures returned
1382 build_array_ref (array, index)
1387 error ("subscript missing in array reference");
1388 return error_mark_node;
1391 if (TREE_TYPE (array) == error_mark_node
1392 || TREE_TYPE (index) == error_mark_node)
1393 return error_mark_node;
1395 if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE
1396 && TREE_CODE (array) != INDIRECT_REF)
1400 /* Subscripting with type char is likely to lose
1401 on a machine where chars are signed.
1402 So warn on any machine, but optionally.
1403 Don't warn for unsigned char since that type is safe.
1404 Don't warn for signed char because anyone who uses that
1405 must have done so deliberately. */
1406 if (warn_char_subscripts
1407 && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node)
1408 warning ("array subscript has type `char'");
1410 /* Apply default promotions *after* noticing character types. */
1411 index = default_conversion (index);
1413 /* Require integer *after* promotion, for sake of enums. */
1414 if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE)
1416 error ("array subscript is not an integer");
1417 return error_mark_node;
1420 /* An array that is indexed by a non-constant
1421 cannot be stored in a register; we must be able to do
1422 address arithmetic on its address.
1423 Likewise an array of elements of variable size. */
1424 if (TREE_CODE (index) != INTEGER_CST
1425 || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0
1426 && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST))
1428 if (mark_addressable (array) == 0)
1429 return error_mark_node;
1431 /* An array that is indexed by a constant value which is not within
1432 the array bounds cannot be stored in a register either; because we
1433 would get a crash in store_bit_field/extract_bit_field when trying
1434 to access a non-existent part of the register. */
1435 if (TREE_CODE (index) == INTEGER_CST
1436 && TYPE_VALUES (TREE_TYPE (array))
1437 && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array))))
1439 if (mark_addressable (array) == 0)
1440 return error_mark_node;
1443 if (pedantic && !lvalue_p (array))
1445 if (DECL_REGISTER (array))
1446 pedwarn ("ANSI C forbids subscripting `register' array");
1448 pedwarn ("ANSI C forbids subscripting non-lvalue array");
1454 while (TREE_CODE (foo) == COMPONENT_REF)
1455 foo = TREE_OPERAND (foo, 0);
1456 if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo))
1457 pedwarn ("ANSI C forbids subscripting non-lvalue array");
1460 type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array)));
1461 rval = build (ARRAY_REF, type, array, index);
1462 /* Array ref is const/volatile if the array elements are
1463 or if the array is. */
1464 TREE_READONLY (rval)
1465 |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array)))
1466 | TREE_READONLY (array));
1467 TREE_SIDE_EFFECTS (rval)
1468 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1469 | TREE_SIDE_EFFECTS (array));
1470 TREE_THIS_VOLATILE (rval)
1471 |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array)))
1472 /* This was added by rms on 16 Nov 91.
1473 It fixes vol struct foo *a; a->elts[1]
1474 in an inline function.
1475 Hope it doesn't break something else. */
1476 | TREE_THIS_VOLATILE (array));
1477 return require_complete_type (fold (rval));
1481 tree ar = default_conversion (array);
1482 tree ind = default_conversion (index);
1484 /* Do the same warning check as above, but only on the part that's
1485 syntactically the index and only if it is also semantically
1487 if (warn_char_subscripts
1488 && TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE
1489 && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node)
1490 warning ("subscript has type `char'");
1492 /* Put the integer in IND to simplify error checking. */
1493 if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE)
1500 if (ar == error_mark_node)
1503 if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE
1504 || TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) == FUNCTION_TYPE)
1506 error ("subscripted value is neither array nor pointer");
1507 return error_mark_node;
1509 if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE)
1511 error ("array subscript is not an integer");
1512 return error_mark_node;
1515 return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0),
1520 /* Build a function call to function FUNCTION with parameters PARAMS.
1521 PARAMS is a list--a chain of TREE_LIST nodes--in which the
1522 TREE_VALUE of each node is a parameter-expression.
1523 FUNCTION's data type may be a function type or a pointer-to-function. */
1526 build_function_call (function, params)
1527 tree function, params;
1529 register tree fntype, fundecl = 0;
1530 register tree coerced_params;
1531 tree name = NULL_TREE, assembler_name = NULL_TREE;
1533 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1534 STRIP_TYPE_NOPS (function);
1536 /* Convert anything with function type to a pointer-to-function. */
1537 if (TREE_CODE (function) == FUNCTION_DECL)
1539 name = DECL_NAME (function);
1540 assembler_name = DECL_ASSEMBLER_NAME (function);
1542 /* Differs from default_conversion by not setting TREE_ADDRESSABLE
1543 (because calling an inline function does not mean the function
1544 needs to be separately compiled). */
1545 fntype = build_type_variant (TREE_TYPE (function),
1546 TREE_READONLY (function),
1547 TREE_THIS_VOLATILE (function));
1549 function = build1 (ADDR_EXPR, build_pointer_type (fntype), function);
1552 function = default_conversion (function);
1554 fntype = TREE_TYPE (function);
1556 if (TREE_CODE (fntype) == ERROR_MARK)
1557 return error_mark_node;
1559 if (!(TREE_CODE (fntype) == POINTER_TYPE
1560 && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE))
1562 error ("called object is not a function");
1563 return error_mark_node;
1566 /* fntype now gets the type of function pointed to. */
1567 fntype = TREE_TYPE (fntype);
1569 /* Convert the parameters to the types declared in the
1570 function prototype, or apply default promotions. */
1573 = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl);
1575 /* Check for errors in format strings. */
1577 if (warn_format && (name || assembler_name))
1578 check_function_format (name, assembler_name, coerced_params);
1580 /* Recognize certain built-in functions so we can make tree-codes
1581 other than CALL_EXPR. We do this when it enables fold-const.c
1582 to do something useful. */
1584 if (TREE_CODE (function) == ADDR_EXPR
1585 && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL
1586 && DECL_BUILT_IN (TREE_OPERAND (function, 0)))
1587 switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0)))
1592 if (coerced_params == 0)
1593 return integer_zero_node;
1594 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
1600 register tree result
1601 = build (CALL_EXPR, TREE_TYPE (fntype),
1602 function, coerced_params, NULL_TREE);
1604 TREE_SIDE_EFFECTS (result) = 1;
1605 if (TREE_TYPE (result) == void_type_node)
1607 return require_complete_type (result);
1611 /* Convert the argument expressions in the list VALUES
1612 to the types in the list TYPELIST. The result is a list of converted
1613 argument expressions.
1615 If TYPELIST is exhausted, or when an element has NULL as its type,
1616 perform the default conversions.
1618 PARMLIST is the chain of parm decls for the function being called.
1619 It may be 0, if that info is not available.
1620 It is used only for generating error messages.
1622 NAME is an IDENTIFIER_NODE or 0. It is used only for error messages.
1624 This is also where warnings about wrong number of args are generated.
1626 Both VALUES and the returned value are chains of TREE_LIST nodes
1627 with the elements of the list in the TREE_VALUE slots of those nodes. */
1630 convert_arguments (typelist, values, name, fundecl)
1631 tree typelist, values, name, fundecl;
1633 register tree typetail, valtail;
1634 register tree result = NULL;
1637 /* Scan the given expressions and types, producing individual
1638 converted arguments and pushing them on RESULT in reverse order. */
1640 for (valtail = values, typetail = typelist, parmnum = 0;
1642 valtail = TREE_CHAIN (valtail), parmnum++)
1644 register tree type = typetail ? TREE_VALUE (typetail) : 0;
1645 register tree val = TREE_VALUE (valtail);
1647 if (type == void_type_node)
1650 error ("too many arguments to function `%s'",
1651 IDENTIFIER_POINTER (name));
1653 error ("too many arguments to function");
1657 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1658 /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0
1659 to convert automatically to a pointer. */
1660 if (TREE_CODE (val) == NON_LVALUE_EXPR)
1661 val = TREE_OPERAND (val, 0);
1663 if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE
1664 || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE)
1665 val = default_conversion (val);
1667 val = require_complete_type (val);
1671 /* Formal parm type is specified by a function prototype. */
1674 if (TYPE_SIZE (type) == 0)
1676 error ("type of formal parameter %d is incomplete", parmnum + 1);
1681 /* Optionally warn about conversions that
1682 differ from the default conversions. */
1683 if (warn_conversion)
1685 int formal_prec = TYPE_PRECISION (type);
1687 if (INTEGRAL_TYPE_P (type)
1688 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1689 warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1690 else if (TREE_CODE (type) == COMPLEX_TYPE
1691 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1692 warn_for_assignment ("%s as complex rather than floating due to prototype", (char *) 0, name, parmnum + 1);
1693 else if (TREE_CODE (type) == REAL_TYPE
1694 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1695 warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1);
1696 else if (TREE_CODE (type) == REAL_TYPE
1697 && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE)
1698 warn_for_assignment ("%s as floating rather than complex due to prototype", (char *) 0, name, parmnum + 1);
1699 /* ??? At some point, messages should be written about
1700 conversions between complex types, but that's too messy
1702 else if (TREE_CODE (type) == REAL_TYPE
1703 && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE)
1705 /* Warn if any argument is passed as `float',
1706 since without a prototype it would be `double'. */
1707 if (formal_prec == TYPE_PRECISION (float_type_node))
1708 warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1);
1710 /* Detect integer changing in width or signedness. */
1711 else if (INTEGRAL_TYPE_P (type)
1712 && INTEGRAL_TYPE_P (TREE_TYPE (val)))
1714 tree would_have_been = default_conversion (val);
1715 tree type1 = TREE_TYPE (would_have_been);
1717 if (TREE_CODE (type) == ENUMERAL_TYPE
1718 && type == TREE_TYPE (val))
1719 /* No warning if function asks for enum
1720 and the actual arg is that enum type. */
1722 else if (formal_prec != TYPE_PRECISION (type1))
1723 warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1);
1724 else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1))
1726 /* Don't complain if the formal parameter type
1727 is an enum, because we can't tell now whether
1728 the value was an enum--even the same enum. */
1729 else if (TREE_CODE (type) == ENUMERAL_TYPE)
1731 else if (TREE_CODE (val) == INTEGER_CST
1732 && int_fits_type_p (val, type))
1733 /* Change in signedness doesn't matter
1734 if a constant value is unaffected. */
1736 /* Likewise for a constant in a NOP_EXPR. */
1737 else if (TREE_CODE (val) == NOP_EXPR
1738 && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST
1739 && int_fits_type_p (TREE_OPERAND (val, 0), type))
1741 #if 0 /* We never get such tree structure here. */
1742 else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE
1743 && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type)
1744 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type))
1745 /* Change in signedness doesn't matter
1746 if an enum value is unaffected. */
1749 /* If the value is extended from a narrower
1750 unsigned type, it doesn't matter whether we
1751 pass it as signed or unsigned; the value
1752 certainly is the same either way. */
1753 else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type)
1754 && TREE_UNSIGNED (TREE_TYPE (val)))
1756 else if (TREE_UNSIGNED (type))
1757 warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1);
1759 warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1);
1763 parmval = convert_for_assignment (type, val,
1764 (char *) 0, /* arg passing */
1765 fundecl, name, parmnum + 1);
1767 #ifdef PROMOTE_PROTOTYPES
1768 if ((TREE_CODE (type) == INTEGER_TYPE
1769 || TREE_CODE (type) == ENUMERAL_TYPE)
1770 && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)))
1771 parmval = default_conversion (parmval);
1774 result = tree_cons (NULL_TREE, parmval, result);
1776 else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE
1777 && (TYPE_PRECISION (TREE_TYPE (val))
1778 < TYPE_PRECISION (double_type_node)))
1779 /* Convert `float' to `double'. */
1780 result = tree_cons (NULL_TREE, convert (double_type_node, val), result);
1782 /* Convert `short' and `char' to full-size `int'. */
1783 result = tree_cons (NULL_TREE, default_conversion (val), result);
1786 typetail = TREE_CHAIN (typetail);
1789 if (typetail != 0 && TREE_VALUE (typetail) != void_type_node)
1792 error ("too few arguments to function `%s'",
1793 IDENTIFIER_POINTER (name));
1795 error ("too few arguments to function");
1798 return nreverse (result);
1801 /* This is the entry point used by the parser
1802 for binary operators in the input.
1803 In addition to constructing the expression,
1804 we check for operands that were written with other binary operators
1805 in a way that is likely to confuse the user. */
1808 parser_build_binary_op (code, arg1, arg2)
1809 enum tree_code code;
1812 tree result = build_binary_op (code, arg1, arg2, 1);
1815 char class1 = TREE_CODE_CLASS (TREE_CODE (arg1));
1816 char class2 = TREE_CODE_CLASS (TREE_CODE (arg2));
1817 enum tree_code code1 = ERROR_MARK;
1818 enum tree_code code2 = ERROR_MARK;
1820 if (class1 == 'e' || class1 == '1'
1821 || class1 == '2' || class1 == '<')
1822 code1 = C_EXP_ORIGINAL_CODE (arg1);
1823 if (class2 == 'e' || class2 == '1'
1824 || class2 == '2' || class2 == '<')
1825 code2 = C_EXP_ORIGINAL_CODE (arg2);
1827 /* Check for cases such as x+y<<z which users are likely
1828 to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE
1829 is cleared to prevent these warnings. */
1830 if (warn_parentheses)
1832 if (code == LSHIFT_EXPR || code == RSHIFT_EXPR)
1834 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1835 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1836 warning ("suggest parentheses around + or - inside shift");
1839 if (code == TRUTH_ORIF_EXPR)
1841 if (code1 == TRUTH_ANDIF_EXPR
1842 || code2 == TRUTH_ANDIF_EXPR)
1843 warning ("suggest parentheses around && within ||");
1846 if (code == BIT_IOR_EXPR)
1848 if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR
1849 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1850 || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR
1851 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1852 warning ("suggest parentheses around arithmetic in operand of |");
1853 /* Check cases like x|y==z */
1854 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1855 warning ("suggest parentheses around comparison in operand of |");
1858 if (code == BIT_XOR_EXPR)
1860 if (code1 == BIT_AND_EXPR
1861 || code1 == PLUS_EXPR || code1 == MINUS_EXPR
1862 || code2 == BIT_AND_EXPR
1863 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1864 warning ("suggest parentheses around arithmetic in operand of ^");
1865 /* Check cases like x^y==z */
1866 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1867 warning ("suggest parentheses around comparison in operand of ^");
1870 if (code == BIT_AND_EXPR)
1872 if (code1 == PLUS_EXPR || code1 == MINUS_EXPR
1873 || code2 == PLUS_EXPR || code2 == MINUS_EXPR)
1874 warning ("suggest parentheses around + or - in operand of &");
1875 /* Check cases like x&y==z */
1876 if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')
1877 warning ("suggest parentheses around comparison in operand of &");
1881 /* Similarly, check for cases like 1<=i<=10 that are probably errors. */
1882 if (TREE_CODE_CLASS (code) == '<' && extra_warnings
1883 && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<'))
1884 warning ("comparisons like X<=Y<=Z do not have their mathematical meaning");
1886 unsigned_conversion_warning (result, arg1);
1887 unsigned_conversion_warning (result, arg2);
1888 overflow_warning (result);
1890 class = TREE_CODE_CLASS (TREE_CODE (result));
1892 /* Record the code that was specified in the source,
1893 for the sake of warnings about confusing nesting. */
1894 if (class == 'e' || class == '1'
1895 || class == '2' || class == '<')
1896 C_SET_EXP_ORIGINAL_CODE (result, code);
1899 int flag = TREE_CONSTANT (result);
1900 /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR
1901 so that convert_for_assignment wouldn't strip it.
1902 That way, we got warnings for things like p = (1 - 1).
1903 But it turns out we should not get those warnings. */
1904 result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result);
1905 C_SET_EXP_ORIGINAL_CODE (result, code);
1906 TREE_CONSTANT (result) = flag;
1912 /* Build a binary-operation expression without default conversions.
1913 CODE is the kind of expression to build.
1914 This function differs from `build' in several ways:
1915 the data type of the result is computed and recorded in it,
1916 warnings are generated if arg data types are invalid,
1917 special handling for addition and subtraction of pointers is known,
1918 and some optimization is done (operations on narrow ints
1919 are done in the narrower type when that gives the same result).
1920 Constant folding is also done before the result is returned.
1922 Note that the operands will never have enumeral types, or function
1923 or array types, because either they will have the default conversions
1924 performed or they have both just been converted to some other type in which
1925 the arithmetic is to be done. */
1928 build_binary_op (code, orig_op0, orig_op1, convert_p)
1929 enum tree_code code;
1930 tree orig_op0, orig_op1;
1934 register enum tree_code code0, code1;
1937 /* Expression code to give to the expression when it is built.
1938 Normally this is CODE, which is what the caller asked for,
1939 but in some special cases we change it. */
1940 register enum tree_code resultcode = code;
1942 /* Data type in which the computation is to be performed.
1943 In the simplest cases this is the common type of the arguments. */
1944 register tree result_type = NULL;
1946 /* Nonzero means operands have already been type-converted
1947 in whatever way is necessary.
1948 Zero means they need to be converted to RESULT_TYPE. */
1951 /* Nonzero means create the expression with this type, rather than
1953 tree build_type = 0;
1955 /* Nonzero means after finally constructing the expression
1956 convert it to this type. */
1957 tree final_type = 0;
1959 /* Nonzero if this is an operation like MIN or MAX which can
1960 safely be computed in short if both args are promoted shorts.
1961 Also implies COMMON.
1962 -1 indicates a bitwise operation; this makes a difference
1963 in the exact conditions for when it is safe to do the operation
1964 in a narrower mode. */
1967 /* Nonzero if this is a comparison operation;
1968 if both args are promoted shorts, compare the original shorts.
1969 Also implies COMMON. */
1970 int short_compare = 0;
1972 /* Nonzero if this is a right-shift operation, which can be computed on the
1973 original short and then promoted if the operand is a promoted short. */
1974 int short_shift = 0;
1976 /* Nonzero means set RESULT_TYPE to the common type of the args. */
1981 op0 = default_conversion (orig_op0);
1982 op1 = default_conversion (orig_op1);
1990 type0 = TREE_TYPE (op0);
1991 type1 = TREE_TYPE (op1);
1993 /* The expression codes of the data types of the arguments tell us
1994 whether the arguments are integers, floating, pointers, etc. */
1995 code0 = TREE_CODE (type0);
1996 code1 = TREE_CODE (type1);
1998 /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */
1999 STRIP_TYPE_NOPS (op0);
2000 STRIP_TYPE_NOPS (op1);
2002 /* If an error was already reported for one of the arguments,
2003 avoid reporting another error. */
2005 if (code0 == ERROR_MARK || code1 == ERROR_MARK)
2006 return error_mark_node;
2011 /* Handle the pointer + int case. */
2012 if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2013 return pointer_int_sum (PLUS_EXPR, op0, op1);
2014 else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE)
2015 return pointer_int_sum (PLUS_EXPR, op1, op0);
2021 /* Subtraction of two similar pointers.
2022 We must subtract them as integers, then divide by object size. */
2023 if (code0 == POINTER_TYPE && code1 == POINTER_TYPE
2024 && comp_target_types (type0, type1))
2025 return pointer_diff (op0, op1);
2026 /* Handle pointer minus int. Just like pointer plus int. */
2027 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2028 return pointer_int_sum (MINUS_EXPR, op0, op1);
2037 case TRUNC_DIV_EXPR:
2039 case FLOOR_DIV_EXPR:
2040 case ROUND_DIV_EXPR:
2041 case EXACT_DIV_EXPR:
2042 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2043 || code0 == COMPLEX_TYPE)
2044 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2045 || code1 == COMPLEX_TYPE))
2047 if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE))
2048 resultcode = RDIV_EXPR;
2051 /* Although it would be tempting to shorten always here, that
2052 loses on some targets, since the modulo instruction is
2053 undefined if the quotient can't be represented in the
2054 computation mode. We shorten only if unsigned or if
2055 dividing by something we know != -1. */
2056 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2057 || (TREE_CODE (op1) == INTEGER_CST
2058 && (TREE_INT_CST_LOW (op1) != -1
2059 || TREE_INT_CST_HIGH (op1) != -1)));
2066 case BIT_ANDTC_EXPR:
2069 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2071 /* If one operand is a constant, and the other is a short type
2072 that has been converted to an int,
2073 really do the work in the short type and then convert the
2074 result to int. If we are lucky, the constant will be 0 or 1
2075 in the short type, making the entire operation go away. */
2076 if (TREE_CODE (op0) == INTEGER_CST
2077 && TREE_CODE (op1) == NOP_EXPR
2078 && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0)))
2079 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0))))
2081 final_type = result_type;
2082 op1 = TREE_OPERAND (op1, 0);
2083 result_type = TREE_TYPE (op1);
2085 if (TREE_CODE (op1) == INTEGER_CST
2086 && TREE_CODE (op0) == NOP_EXPR
2087 && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0)))
2088 && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0))))
2090 final_type = result_type;
2091 op0 = TREE_OPERAND (op0, 0);
2092 result_type = TREE_TYPE (op0);
2096 case TRUNC_MOD_EXPR:
2097 case FLOOR_MOD_EXPR:
2098 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2100 /* Although it would be tempting to shorten always here, that loses
2101 on some targets, since the modulo instruction is undefined if the
2102 quotient can't be represented in the computation mode. We shorten
2103 only if unsigned or if dividing by something we know != -1. */
2104 shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0))
2105 || (TREE_CODE (op1) == INTEGER_CST
2106 && (TREE_INT_CST_LOW (op1) != -1
2107 || TREE_INT_CST_HIGH (op1) != -1)));
2112 case TRUTH_ANDIF_EXPR:
2113 case TRUTH_ORIF_EXPR:
2114 case TRUTH_AND_EXPR:
2116 case TRUTH_XOR_EXPR:
2117 if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE
2118 || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2119 && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE
2120 || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2122 /* Result of these operations is always an int,
2123 but that does not mean the operands should be
2124 converted to ints! */
2125 result_type = integer_type_node;
2126 op0 = truthvalue_conversion (op0);
2127 op1 = truthvalue_conversion (op1);
2132 /* Shift operations: result has same type as first operand;
2133 always convert second operand to int.
2134 Also set SHORT_SHIFT if shifting rightward. */
2137 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2139 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2141 if (tree_int_cst_sgn (op1) < 0)
2142 warning ("right shift count is negative");
2145 if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1))
2147 if (TREE_INT_CST_HIGH (op1) != 0
2148 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2149 >= TYPE_PRECISION (type0)))
2150 warning ("right shift count >= width of type");
2153 /* Use the type of the value to be shifted.
2154 This is what most traditional C compilers do. */
2155 result_type = type0;
2156 /* Unless traditional, convert the shift-count to an integer,
2157 regardless of size of value being shifted. */
2158 if (! flag_traditional)
2160 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2161 op1 = convert (integer_type_node, op1);
2162 /* Avoid converting op1 to result_type later. */
2169 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2171 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2173 if (tree_int_cst_sgn (op1) < 0)
2174 warning ("left shift count is negative");
2175 else if (TREE_INT_CST_HIGH (op1) != 0
2176 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2177 >= TYPE_PRECISION (type0)))
2178 warning ("left shift count >= width of type");
2180 /* Use the type of the value to be shifted.
2181 This is what most traditional C compilers do. */
2182 result_type = type0;
2183 /* Unless traditional, convert the shift-count to an integer,
2184 regardless of size of value being shifted. */
2185 if (! flag_traditional)
2187 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2188 op1 = convert (integer_type_node, op1);
2189 /* Avoid converting op1 to result_type later. */
2197 if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)
2199 if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0)
2201 if (tree_int_cst_sgn (op1) < 0)
2202 warning ("shift count is negative");
2203 else if (TREE_INT_CST_HIGH (op1) != 0
2204 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1)
2205 >= TYPE_PRECISION (type0)))
2206 warning ("shift count >= width of type");
2208 /* Use the type of the value to be shifted.
2209 This is what most traditional C compilers do. */
2210 result_type = type0;
2211 /* Unless traditional, convert the shift-count to an integer,
2212 regardless of size of value being shifted. */
2213 if (! flag_traditional)
2215 if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node)
2216 op1 = convert (integer_type_node, op1);
2217 /* Avoid converting op1 to result_type later. */
2225 /* Result of comparison is always int,
2226 but don't convert the args to int! */
2227 build_type = integer_type_node;
2228 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE
2229 || code0 == COMPLEX_TYPE)
2230 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE
2231 || code1 == COMPLEX_TYPE))
2233 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2235 register tree tt0 = TREE_TYPE (type0);
2236 register tree tt1 = TREE_TYPE (type1);
2237 /* Anything compares with void *. void * compares with anything.
2238 Otherwise, the targets must be compatible
2239 and both must be object or both incomplete. */
2240 if (comp_target_types (type0, type1))
2241 result_type = common_type (type0, type1);
2242 else if (TYPE_MAIN_VARIANT (tt0) == void_type_node)
2244 /* op0 != orig_op0 detects the case of something
2245 whose value is 0 but which isn't a valid null ptr const. */
2246 if (pedantic && (!integer_zerop (op0) || op0 != orig_op0)
2247 && TREE_CODE (tt1) == FUNCTION_TYPE)
2248 pedwarn ("ANSI C forbids comparison of `void *' with function pointer");
2250 else if (TYPE_MAIN_VARIANT (tt1) == void_type_node)
2252 if (pedantic && (!integer_zerop (op1) || op1 != orig_op1)
2253 && TREE_CODE (tt0) == FUNCTION_TYPE)
2254 pedwarn ("ANSI C forbids comparison of `void *' with function pointer");
2257 pedwarn ("comparison of distinct pointer types lacks a cast");
2259 if (result_type == NULL_TREE)
2260 result_type = ptr_type_node;
2262 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2263 && integer_zerop (op1))
2264 result_type = type0;
2265 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2266 && integer_zerop (op0))
2267 result_type = type1;
2268 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2270 result_type = type0;
2271 if (! flag_traditional)
2272 pedwarn ("comparison between pointer and integer");
2274 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2276 result_type = type1;
2277 if (! flag_traditional)
2278 pedwarn ("comparison between pointer and integer");
2284 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2285 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2287 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2289 if (comp_target_types (type0, type1))
2291 result_type = common_type (type0, type1);
2293 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2294 pedwarn ("ANSI C forbids ordered comparisons of pointers to functions");
2298 result_type = ptr_type_node;
2299 pedwarn ("comparison of distinct pointer types lacks a cast");
2308 build_type = integer_type_node;
2309 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE)
2310 && (code1 == INTEGER_TYPE || code1 == REAL_TYPE))
2312 else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE)
2314 if (comp_target_types (type0, type1))
2316 result_type = common_type (type0, type1);
2317 if ((TYPE_SIZE (TREE_TYPE (type0)) != 0)
2318 != (TYPE_SIZE (TREE_TYPE (type1)) != 0))
2319 pedwarn ("comparison of complete and incomplete pointers");
2321 && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE)
2322 pedwarn ("ANSI C forbids ordered comparisons of pointers to functions");
2326 result_type = ptr_type_node;
2327 pedwarn ("comparison of distinct pointer types lacks a cast");
2330 else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST
2331 && integer_zerop (op1))
2333 result_type = type0;
2334 if (pedantic || extra_warnings)
2335 pedwarn ("ordered comparison of pointer with integer zero");
2337 else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST
2338 && integer_zerop (op0))
2340 result_type = type1;
2342 pedwarn ("ordered comparison of pointer with integer zero");
2344 else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE)
2346 result_type = type0;
2347 if (! flag_traditional)
2348 pedwarn ("comparison between pointer and integer");
2350 else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE)
2352 result_type = type1;
2353 if (! flag_traditional)
2354 pedwarn ("comparison between pointer and integer");
2362 if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE)
2364 (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE))
2366 int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE);
2368 if (shorten || common || short_compare)
2369 result_type = common_type (type0, type1);
2371 /* For certain operations (which identify themselves by shorten != 0)
2372 if both args were extended from the same smaller type,
2373 do the arithmetic in that type and then extend.
2375 shorten !=0 and !=1 indicates a bitwise operation.
2376 For them, this optimization is safe only if
2377 both args are zero-extended or both are sign-extended.
2378 Otherwise, we might change the result.
2379 Eg, (short)-1 | (unsigned short)-1 is (int)-1
2380 but calculated in (unsigned short) it would be (unsigned short)-1. */
2382 if (shorten && none_complex)
2384 int unsigned0, unsigned1;
2385 tree arg0 = get_narrower (op0, &unsigned0);
2386 tree arg1 = get_narrower (op1, &unsigned1);
2387 /* UNS is 1 if the operation to be done is an unsigned one. */
2388 int uns = TREE_UNSIGNED (result_type);
2391 final_type = result_type;
2393 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
2394 but it *requires* conversion to FINAL_TYPE. */
2396 if ((TYPE_PRECISION (TREE_TYPE (op0))
2397 == TYPE_PRECISION (TREE_TYPE (arg0)))
2398 && TREE_TYPE (op0) != final_type)
2399 unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0));
2400 if ((TYPE_PRECISION (TREE_TYPE (op1))
2401 == TYPE_PRECISION (TREE_TYPE (arg1)))
2402 && TREE_TYPE (op1) != final_type)
2403 unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1));
2405 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
2407 /* For bitwise operations, signedness of nominal type
2408 does not matter. Consider only how operands were extended. */
2412 /* Note that in all three cases below we refrain from optimizing
2413 an unsigned operation on sign-extended args.
2414 That would not be valid. */
2416 /* Both args variable: if both extended in same way
2417 from same width, do it in that width.
2418 Do it unsigned if args were zero-extended. */
2419 if ((TYPE_PRECISION (TREE_TYPE (arg0))
2420 < TYPE_PRECISION (result_type))
2421 && (TYPE_PRECISION (TREE_TYPE (arg1))
2422 == TYPE_PRECISION (TREE_TYPE (arg0)))
2423 && unsigned0 == unsigned1
2424 && (unsigned0 || !uns))
2426 = signed_or_unsigned_type (unsigned0,
2427 common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
2428 else if (TREE_CODE (arg0) == INTEGER_CST
2429 && (unsigned1 || !uns)
2430 && (TYPE_PRECISION (TREE_TYPE (arg1))
2431 < TYPE_PRECISION (result_type))
2432 && (type = signed_or_unsigned_type (unsigned1,
2434 int_fits_type_p (arg0, type)))
2436 else if (TREE_CODE (arg1) == INTEGER_CST
2437 && (unsigned0 || !uns)
2438 && (TYPE_PRECISION (TREE_TYPE (arg0))
2439 < TYPE_PRECISION (result_type))
2440 && (type = signed_or_unsigned_type (unsigned0,
2442 int_fits_type_p (arg1, type)))
2446 /* Shifts can be shortened if shifting right. */
2451 tree arg0 = get_narrower (op0, &unsigned_arg);
2453 final_type = result_type;
2455 if (arg0 == op0 && final_type == TREE_TYPE (op0))
2456 unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0));
2458 if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type)
2459 /* We can shorten only if the shift count is less than the
2460 number of bits in the smaller type size. */
2461 && TREE_INT_CST_HIGH (op1) == 0
2462 && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1)
2463 /* If arg is sign-extended and then unsigned-shifted,
2464 we can simulate this with a signed shift in arg's type
2465 only if the extended result is at least twice as wide
2466 as the arg. Otherwise, the shift could use up all the
2467 ones made by sign-extension and bring in zeros.
2468 We can't optimize that case at all, but in most machines
2469 it never happens because available widths are 2**N. */
2470 && (!TREE_UNSIGNED (final_type)
2472 || 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type)))
2474 /* Do an unsigned shift if the operand was zero-extended. */
2476 = signed_or_unsigned_type (unsigned_arg,
2478 /* Convert value-to-be-shifted to that type. */
2479 if (TREE_TYPE (op0) != result_type)
2480 op0 = convert (result_type, op0);
2485 /* Comparison operations are shortened too but differently.
2486 They identify themselves by setting short_compare = 1. */
2490 /* Don't write &op0, etc., because that would prevent op0
2491 from being kept in a register.
2492 Instead, make copies of the our local variables and
2493 pass the copies by reference, then copy them back afterward. */
2494 tree xop0 = op0, xop1 = op1, xresult_type = result_type;
2495 enum tree_code xresultcode = resultcode;
2497 = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode);
2500 op0 = xop0, op1 = xop1;
2502 resultcode = xresultcode;
2504 if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare != 0)
2505 && skip_evaluation == 0)
2507 int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0));
2508 int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1));
2510 int unsignedp0, unsignedp1;
2511 tree primop0 = get_narrower (op0, &unsignedp0);
2512 tree primop1 = get_narrower (op1, &unsignedp1);
2514 /* Avoid spurious warnings for comparison with enumerators. */
2518 STRIP_TYPE_NOPS (xop0);
2519 STRIP_TYPE_NOPS (xop1);
2521 /* Give warnings for comparisons between signed and unsigned
2522 quantities that may fail. */
2523 /* Do the checking based on the original operand trees, so that
2524 casts will be considered, but default promotions won't be. */
2526 /* Do not warn if the comparison is being done in a signed type,
2527 since the signed type will only be chosen if it can represent
2528 all the values of the unsigned type. */
2529 if (! TREE_UNSIGNED (result_type))
2531 /* Do not warn if both operands are unsigned. */
2532 else if (op0_signed == op1_signed)
2534 /* Do not warn if the signed quantity is an unsuffixed
2535 integer literal (or some static constant expression
2536 involving such literals) and it is non-negative. */
2537 else if ((op0_signed && TREE_CODE (xop0) == INTEGER_CST
2538 && tree_int_cst_sgn (xop0) >= 0)
2539 || (op1_signed && TREE_CODE (xop1) == INTEGER_CST
2540 && tree_int_cst_sgn (xop1) >= 0))
2542 /* Do not warn if the comparison is an equality operation,
2543 the unsigned quantity is an integral constant and it does
2544 not use the most significant bit of result_type. */
2545 else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR)
2546 && ((op0_signed && TREE_CODE (xop1) == INTEGER_CST
2547 && int_fits_type_p (xop1, signed_type (result_type)))
2548 || (op1_signed && TREE_CODE (xop0) == INTEGER_CST
2549 && int_fits_type_p (xop0, signed_type (result_type)))))
2552 warning ("comparison between signed and unsigned");
2554 /* Warn if two unsigned values are being compared in a size
2555 larger than their original size, and one (and only one) is the
2556 result of a `~' operator. This comparison will always fail.
2558 Also warn if one operand is a constant, and the constant
2559 does not have all bits set that are set in the ~ operand
2560 when it is extended. */
2562 if ((TREE_CODE (primop0) == BIT_NOT_EXPR)
2563 != (TREE_CODE (primop1) == BIT_NOT_EXPR))
2565 if (TREE_CODE (primop0) == BIT_NOT_EXPR)
2566 primop0 = get_narrower (TREE_OPERAND (primop0, 0),
2569 primop1 = get_narrower (TREE_OPERAND (primop1, 0),
2572 if (TREE_CODE (primop0) == INTEGER_CST
2573 || TREE_CODE (primop1) == INTEGER_CST)
2576 long constant, mask;
2577 int unsignedp, bits;
2579 if (TREE_CODE (primop0) == INTEGER_CST)
2582 unsignedp = unsignedp1;
2583 constant = TREE_INT_CST_LOW (primop0);
2588 unsignedp = unsignedp0;
2589 constant = TREE_INT_CST_LOW (primop1);
2592 bits = TYPE_PRECISION (TREE_TYPE (primop));
2593 if (bits < TYPE_PRECISION (result_type)
2594 && bits < HOST_BITS_PER_LONG && unsignedp)
2596 mask = (~0L) << bits;
2597 if ((mask & constant) != mask)
2598 warning ("comparison of promoted ~unsigned with constant");
2601 else if (unsignedp0 && unsignedp1
2602 && (TYPE_PRECISION (TREE_TYPE (primop0))
2603 < TYPE_PRECISION (result_type))
2604 && (TYPE_PRECISION (TREE_TYPE (primop1))
2605 < TYPE_PRECISION (result_type)))
2606 warning ("comparison of promoted ~unsigned with unsigned");
2612 /* At this point, RESULT_TYPE must be nonzero to avoid an error message.
2613 If CONVERTED is zero, both args will be converted to type RESULT_TYPE.
2614 Then the expression will be built.
2615 It will be given type FINAL_TYPE if that is nonzero;
2616 otherwise, it will be given type RESULT_TYPE. */
2620 binary_op_error (code);
2621 return error_mark_node;
2626 if (TREE_TYPE (op0) != result_type)
2627 op0 = convert (result_type, op0);
2628 if (TREE_TYPE (op1) != result_type)
2629 op1 = convert (result_type, op1);
2632 if (build_type == NULL_TREE)
2633 build_type = result_type;
2636 register tree result = build (resultcode, build_type, op0, op1);
2637 register tree folded;
2639 folded = fold (result);
2640 if (folded == result)
2641 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2642 if (final_type != 0)
2643 return convert (final_type, folded);
2648 /* Return a tree for the sum or difference (RESULTCODE says which)
2649 of pointer PTROP and integer INTOP. */
2652 pointer_int_sum (resultcode, ptrop, intop)
2653 enum tree_code resultcode;
2654 register tree ptrop, intop;
2658 register tree result;
2659 register tree folded;
2661 /* The result is a pointer of the same type that is being added. */
2663 register tree result_type = TREE_TYPE (ptrop);
2665 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
2667 if (pedantic || warn_pointer_arith)
2668 pedwarn ("pointer of type `void *' used in arithmetic");
2669 size_exp = integer_one_node;
2671 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
2673 if (pedantic || warn_pointer_arith)
2674 pedwarn ("pointer to a function used in arithmetic");
2675 size_exp = integer_one_node;
2678 size_exp = c_size_in_bytes (TREE_TYPE (result_type));
2680 /* If what we are about to multiply by the size of the elements
2681 contains a constant term, apply distributive law
2682 and multiply that constant term separately.
2683 This helps produce common subexpressions. */
2685 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
2686 && ! TREE_CONSTANT (intop)
2687 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
2688 && TREE_CONSTANT (size_exp)
2689 /* If the constant comes from pointer subtraction,
2690 skip this optimization--it would cause an error. */
2691 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
2692 /* If the constant is unsigned, and smaller than the pointer size,
2693 then we must skip this optimization. This is because it could cause
2694 an overflow error if the constant is negative but INTOP is not. */
2695 && (! TREE_UNSIGNED (TREE_TYPE (intop))
2696 || (TYPE_PRECISION (TREE_TYPE (intop))
2697 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
2699 enum tree_code subcode = resultcode;
2700 tree int_type = TREE_TYPE (intop);
2701 if (TREE_CODE (intop) == MINUS_EXPR)
2702 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
2703 /* Convert both subexpression types to the type of intop,
2704 because weird cases involving pointer arithmetic
2705 can result in a sum or difference with different type args. */
2706 ptrop = build_binary_op (subcode, ptrop,
2707 convert (int_type, TREE_OPERAND (intop, 1)), 1);
2708 intop = convert (int_type, TREE_OPERAND (intop, 0));
2711 /* Convert the integer argument to a type the same size as sizetype
2712 so the multiply won't overflow spuriously. */
2714 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
2715 || TREE_UNSIGNED (TREE_TYPE (intop)) != TREE_UNSIGNED (sizetype))
2716 intop = convert (type_for_size (TYPE_PRECISION (sizetype),
2717 TREE_UNSIGNED (sizetype)), intop);
2719 /* Replace the integer argument with a suitable product by the object size.
2720 Do this multiplication as signed, then convert to the appropriate
2721 pointer type (actually unsigned integral). */
2723 intop = convert (result_type,
2724 build_binary_op (MULT_EXPR, intop,
2725 convert (TREE_TYPE (intop), size_exp), 1));
2727 /* Create the sum or difference. */
2729 result = build (resultcode, result_type, ptrop, intop);
2731 folded = fold (result);
2732 if (folded == result)
2733 TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop);
2737 /* Return a tree for the difference of pointers OP0 and OP1.
2738 The resulting tree has type int. */
2741 pointer_diff (op0, op1)
2742 register tree op0, op1;
2744 register tree result, folded;
2745 tree restype = ptrdiff_type_node;
2747 tree target_type = TREE_TYPE (TREE_TYPE (op0));
2749 if (pedantic || warn_pointer_arith)
2751 if (TREE_CODE (target_type) == VOID_TYPE)
2752 pedwarn ("pointer of type `void *' used in subtraction");
2753 if (TREE_CODE (target_type) == FUNCTION_TYPE)
2754 pedwarn ("pointer to a function used in subtraction");
2757 /* First do the subtraction as integers;
2758 then drop through to build the divide operator.
2759 Do not do default conversions on the minus operator
2760 in case restype is a short type. */
2762 op0 = build_binary_op (MINUS_EXPR, convert (restype, op0),
2763 convert (restype, op1), 0);
2764 /* This generates an error if op1 is pointer to incomplete type. */
2765 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0)
2766 error ("arithmetic on pointer to an incomplete type");
2768 /* This generates an error if op0 is pointer to incomplete type. */
2769 op1 = c_size_in_bytes (target_type);
2771 /* Divide by the size, in easiest possible way. */
2773 result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1));
2775 folded = fold (result);
2776 if (folded == result)
2777 TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1);
2781 /* Construct and perhaps optimize a tree representation
2782 for a unary operation. CODE, a tree_code, specifies the operation
2783 and XARG is the operand. NOCONVERT nonzero suppresses
2784 the default promotions (such as from short to int). */
2787 build_unary_op (code, xarg, noconvert)
2788 enum tree_code code;
2792 /* No default_conversion here. It causes trouble for ADDR_EXPR. */
2793 register tree arg = xarg;
2794 register tree argtype = 0;
2795 register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg));
2796 char *errstring = NULL;
2799 if (typecode == ERROR_MARK)
2800 return error_mark_node;
2801 if (typecode == ENUMERAL_TYPE)
2802 typecode = INTEGER_TYPE;
2807 /* This is used for unary plus, because a CONVERT_EXPR
2808 is enough to prevent anybody from looking inside for
2809 associativity, but won't generate any code. */
2810 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2811 || typecode == COMPLEX_TYPE))
2812 errstring = "wrong type argument to unary plus";
2813 else if (!noconvert)
2814 arg = default_conversion (arg);
2818 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2819 || typecode == COMPLEX_TYPE))
2820 errstring = "wrong type argument to unary minus";
2821 else if (!noconvert)
2822 arg = default_conversion (arg);
2826 if (typecode == COMPLEX_TYPE)
2830 arg = default_conversion (arg);
2832 else if (typecode != INTEGER_TYPE)
2833 errstring = "wrong type argument to bit-complement";
2834 else if (!noconvert)
2835 arg = default_conversion (arg);
2839 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2840 || typecode == COMPLEX_TYPE))
2841 errstring = "wrong type argument to abs";
2842 else if (!noconvert)
2843 arg = default_conversion (arg);
2847 /* Conjugating a real value is a no-op, but allow it anyway. */
2848 if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE
2849 || typecode == COMPLEX_TYPE))
2850 errstring = "wrong type argument to conjugation";
2851 else if (!noconvert)
2852 arg = default_conversion (arg);
2855 case TRUTH_NOT_EXPR:
2856 if (typecode != INTEGER_TYPE
2857 && typecode != REAL_TYPE && typecode != POINTER_TYPE
2858 && typecode != COMPLEX_TYPE
2859 /* These will convert to a pointer. */
2860 && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE)
2862 errstring = "wrong type argument to unary exclamation mark";
2865 arg = truthvalue_conversion (arg);
2866 return invert_truthvalue (arg);
2872 if (TREE_CODE (arg) == COMPLEX_CST)
2873 return TREE_REALPART (arg);
2874 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2875 return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2880 if (TREE_CODE (arg) == COMPLEX_CST)
2881 return TREE_IMAGPART (arg);
2882 else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
2883 return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg));
2885 return convert (TREE_TYPE (arg), integer_zero_node);
2887 case PREINCREMENT_EXPR:
2888 case POSTINCREMENT_EXPR:
2889 case PREDECREMENT_EXPR:
2890 case POSTDECREMENT_EXPR:
2891 /* Handle complex lvalues (when permitted)
2892 by reduction to simpler cases. */
2894 val = unary_complex_lvalue (code, arg);
2898 /* Increment or decrement the real part of the value,
2899 and don't change the imaginary part. */
2900 if (typecode == COMPLEX_TYPE)
2904 arg = stabilize_reference (arg);
2905 real = build_unary_op (REALPART_EXPR, arg, 1);
2906 imag = build_unary_op (IMAGPART_EXPR, arg, 1);
2907 return build (COMPLEX_EXPR, TREE_TYPE (arg),
2908 build_unary_op (code, real, 1), imag);
2911 /* Report invalid types. */
2913 if (typecode != POINTER_TYPE
2914 && typecode != INTEGER_TYPE && typecode != REAL_TYPE)
2916 if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
2917 errstring ="wrong type argument to increment";
2919 errstring ="wrong type argument to decrement";
2925 tree result_type = TREE_TYPE (arg);
2927 arg = get_unwidened (arg, 0);
2928 argtype = TREE_TYPE (arg);
2930 /* Compute the increment. */
2932 if (typecode == POINTER_TYPE)
2934 /* If pointer target is an undefined struct,
2935 we just cannot know how to do the arithmetic. */
2936 if (TYPE_SIZE (TREE_TYPE (result_type)) == 0)
2937 error ("%s of pointer to unknown structure",
2938 ((code == PREINCREMENT_EXPR
2939 || code == POSTINCREMENT_EXPR)
2940 ? "increment" : "decrement"));
2941 else if ((pedantic || warn_pointer_arith)
2942 && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE
2943 || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE))
2944 pedwarn ("wrong type argument to %s",
2945 ((code == PREINCREMENT_EXPR
2946 || code == POSTINCREMENT_EXPR)
2947 ? "increment" : "decrement"));
2948 inc = c_size_in_bytes (TREE_TYPE (result_type));
2951 inc = integer_one_node;
2953 inc = convert (argtype, inc);
2955 /* Handle incrementing a cast-expression. */
2958 switch (TREE_CODE (arg))
2963 case FIX_TRUNC_EXPR:
2964 case FIX_FLOOR_EXPR:
2965 case FIX_ROUND_EXPR:
2967 pedantic_lvalue_warning (CONVERT_EXPR);
2968 /* If the real type has the same machine representation
2969 as the type it is cast to, we can make better output
2970 by adding directly to the inside of the cast. */
2971 if ((TREE_CODE (TREE_TYPE (arg))
2972 == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0))))
2973 && (TYPE_MODE (TREE_TYPE (arg))
2974 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0)))))
2975 arg = TREE_OPERAND (arg, 0);
2978 tree incremented, modify, value;
2979 arg = stabilize_reference (arg);
2980 if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR)
2983 value = save_expr (arg);
2984 incremented = build (((code == PREINCREMENT_EXPR
2985 || code == POSTINCREMENT_EXPR)
2986 ? PLUS_EXPR : MINUS_EXPR),
2987 argtype, value, inc);
2988 TREE_SIDE_EFFECTS (incremented) = 1;
2989 modify = build_modify_expr (arg, NOP_EXPR, incremented);
2990 value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value);
2991 TREE_USED (value) = 1;
3001 /* Complain about anything else that is not a true lvalue. */
3002 if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR
3003 || code == POSTINCREMENT_EXPR)
3004 ? "increment" : "decrement")))
3005 return error_mark_node;
3007 /* Report a read-only lvalue. */
3008 if (TREE_READONLY (arg))
3009 readonly_warning (arg,
3010 ((code == PREINCREMENT_EXPR
3011 || code == POSTINCREMENT_EXPR)
3012 ? "increment" : "decrement"));
3014 val = build (code, TREE_TYPE (arg), arg, inc);
3015 TREE_SIDE_EFFECTS (val) = 1;
3016 val = convert (result_type, val);
3017 if (TREE_CODE (val) != code)
3018 TREE_NO_UNUSED_WARNING (val) = 1;
3023 /* Note that this operation never does default_conversion
3024 regardless of NOCONVERT. */
3026 /* Let &* cancel out to simplify resulting code. */
3027 if (TREE_CODE (arg) == INDIRECT_REF)
3029 /* Don't let this be an lvalue. */
3030 if (lvalue_p (TREE_OPERAND (arg, 0)))
3031 return non_lvalue (TREE_OPERAND (arg, 0));
3032 return TREE_OPERAND (arg, 0);
3035 /* For &x[y], return x+y */
3036 if (TREE_CODE (arg) == ARRAY_REF)
3038 if (mark_addressable (TREE_OPERAND (arg, 0)) == 0)
3039 return error_mark_node;
3040 return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0),
3041 TREE_OPERAND (arg, 1), 1);
3044 /* Handle complex lvalues (when permitted)
3045 by reduction to simpler cases. */
3046 val = unary_complex_lvalue (code, arg);
3050 #if 0 /* Turned off because inconsistent;
3051 float f; *&(int)f = 3.4 stores in int format
3052 whereas (int)f = 3.4 stores in float format. */
3053 /* Address of a cast is just a cast of the address
3054 of the operand of the cast. */
3055 switch (TREE_CODE (arg))
3060 case FIX_TRUNC_EXPR:
3061 case FIX_FLOOR_EXPR:
3062 case FIX_ROUND_EXPR:
3065 pedwarn ("ANSI C forbids the address of a cast expression");
3066 return convert (build_pointer_type (TREE_TYPE (arg)),
3067 build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0),
3072 /* Allow the address of a constructor if all the elements
3074 if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg))
3076 /* Anything not already handled and not a true memory reference
3078 else if (typecode != FUNCTION_TYPE && !lvalue_or_else (arg, "unary `&'"))
3079 return error_mark_node;
3081 /* Ordinary case; arg is a COMPONENT_REF or a decl. */
3082 argtype = TREE_TYPE (arg);
3083 /* If the lvalue is const or volatile,
3084 merge that into the type that the address will point to. */
3085 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd'
3086 || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r')
3088 if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg))
3089 argtype = c_build_type_variant (argtype,
3090 TREE_READONLY (arg),
3091 TREE_THIS_VOLATILE (arg));
3094 argtype = build_pointer_type (argtype);
3096 if (mark_addressable (arg) == 0)
3097 return error_mark_node;
3102 if (TREE_CODE (arg) == COMPONENT_REF)
3104 tree field = TREE_OPERAND (arg, 1);
3106 addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0);
3108 if (DECL_C_BIT_FIELD (field))
3110 error ("attempt to take address of bit-field structure member `%s'",
3111 IDENTIFIER_POINTER (DECL_NAME (field)));
3112 return error_mark_node;
3115 addr = convert (argtype, addr);
3117 if (! integer_zerop (DECL_FIELD_BITPOS (field)))
3120 = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field),
3121 size_int (BITS_PER_UNIT));
3122 int flag = TREE_CONSTANT (addr);
3123 addr = fold (build (PLUS_EXPR, argtype,
3124 addr, convert (argtype, offset)));
3125 TREE_CONSTANT (addr) = flag;
3129 addr = build1 (code, argtype, arg);
3131 /* Address of a static or external variable or
3132 file-scope function counts as a constant. */
3134 && ! (TREE_CODE (arg) == FUNCTION_DECL
3135 && DECL_CONTEXT (arg) != 0))
3136 TREE_CONSTANT (addr) = 1;
3147 argtype = TREE_TYPE (arg);
3148 return fold (build1 (code, argtype, arg));
3152 return error_mark_node;
3156 /* If CONVERSIONS is a conversion expression or a nested sequence of such,
3157 convert ARG with the same conversions in the same order
3158 and return the result. */
3161 convert_sequence (conversions, arg)
3165 switch (TREE_CODE (conversions))
3170 case FIX_TRUNC_EXPR:
3171 case FIX_FLOOR_EXPR:
3172 case FIX_ROUND_EXPR:
3174 return convert (TREE_TYPE (conversions),
3175 convert_sequence (TREE_OPERAND (conversions, 0),
3184 /* Return nonzero if REF is an lvalue valid for this language.
3185 Lvalues can be assigned, unless their type has TYPE_READONLY.
3186 Lvalues can have their address taken, unless they have DECL_REGISTER. */
3192 register enum tree_code code = TREE_CODE (ref);
3199 return lvalue_p (TREE_OPERAND (ref, 0));
3210 return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE
3211 && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE);
3215 return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE;
3222 /* Return nonzero if REF is an lvalue valid for this language;
3223 otherwise, print an error message and return zero. */
3226 lvalue_or_else (ref, string)
3230 int win = lvalue_p (ref);
3232 error ("invalid lvalue in %s", string);
3236 /* Apply unary lvalue-demanding operator CODE to the expression ARG
3237 for certain kinds of expressions which are not really lvalues
3238 but which we can accept as lvalues.
3240 If ARG is not a kind of expression we can handle, return zero. */
3243 unary_complex_lvalue (code, arg)
3244 enum tree_code code;
3247 /* Handle (a, b) used as an "lvalue". */
3248 if (TREE_CODE (arg) == COMPOUND_EXPR)
3250 tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0);
3252 /* If this returns a function type, it isn't really being used as
3253 an lvalue, so don't issue a warning about it. */
3254 if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE)
3255 pedantic_lvalue_warning (COMPOUND_EXPR);
3257 return build (COMPOUND_EXPR, TREE_TYPE (real_result),
3258 TREE_OPERAND (arg, 0), real_result);
3261 /* Handle (a ? b : c) used as an "lvalue". */
3262 if (TREE_CODE (arg) == COND_EXPR)
3264 pedantic_lvalue_warning (COND_EXPR);
3265 if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE)
3266 pedantic_lvalue_warning (COMPOUND_EXPR);
3268 return (build_conditional_expr
3269 (TREE_OPERAND (arg, 0),
3270 build_unary_op (code, TREE_OPERAND (arg, 1), 0),
3271 build_unary_op (code, TREE_OPERAND (arg, 2), 0)));
3277 /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR
3278 COMPOUND_EXPR, or CONVERT_EXPR (for casts). */
3281 pedantic_lvalue_warning (code)
3282 enum tree_code code;
3285 pedwarn ("ANSI C forbids use of %s expressions as lvalues",
3286 code == COND_EXPR ? "conditional"
3287 : code == COMPOUND_EXPR ? "compound" : "cast");
3290 /* Warn about storing in something that is `const'. */
3293 readonly_warning (arg, string)
3298 strcpy (buf, string);
3300 /* Forbid assignments to iterators. */
3301 if (TREE_CODE (arg) == VAR_DECL && ITERATOR_P (arg))
3303 strcat (buf, " of iterator `%s'");
3304 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg)));
3307 if (TREE_CODE (arg) == COMPONENT_REF)
3309 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
3310 readonly_warning (TREE_OPERAND (arg, 0), string);
3313 strcat (buf, " of read-only member `%s'");
3314 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1))));
3317 else if (TREE_CODE (arg) == VAR_DECL)
3319 strcat (buf, " of read-only variable `%s'");
3320 pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg)));
3324 pedwarn ("%s of read-only location", buf);
3328 /* Mark EXP saying that we need to be able to take the
3329 address of it; it should not be allocated in a register.
3330 Value is 1 if successful. */
3333 mark_addressable (exp)
3336 register tree x = exp;
3338 switch (TREE_CODE (x))
3341 if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1)))
3343 error ("cannot take address of bitfield `%s'",
3344 IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1))));
3348 /* ... fall through ... */
3354 x = TREE_OPERAND (x, 0);
3358 TREE_ADDRESSABLE (x) = 1;
3365 if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)
3366 && DECL_NONLOCAL (x))
3368 if (TREE_PUBLIC (x))
3370 error ("global register variable `%s' used in nested function",
3371 IDENTIFIER_POINTER (DECL_NAME (x)));
3374 pedwarn ("register variable `%s' used in nested function",
3375 IDENTIFIER_POINTER (DECL_NAME (x)));
3377 else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x))
3379 if (TREE_PUBLIC (x))
3381 error ("address of global register variable `%s' requested",
3382 IDENTIFIER_POINTER (DECL_NAME (x)));
3386 /* If we are making this addressable due to its having
3387 volatile components, give a different error message. Also
3388 handle the case of an unnamed parameter by not trying
3389 to give the name. */
3391 else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x)))
3393 error ("cannot put object with volatile field into register");
3397 pedwarn ("address of register variable `%s' requested",
3398 IDENTIFIER_POINTER (DECL_NAME (x)));
3400 put_var_into_stack (x);
3404 TREE_ADDRESSABLE (x) = 1;
3405 #if 0 /* poplevel deals with this now. */
3406 if (DECL_CONTEXT (x) == 0)
3407 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1;
3415 /* Build and return a conditional expression IFEXP ? OP1 : OP2. */
3418 build_conditional_expr (ifexp, op1, op2)
3419 tree ifexp, op1, op2;
3421 register tree type1;
3422 register tree type2;
3423 register enum tree_code code1;
3424 register enum tree_code code2;
3425 register tree result_type = NULL;
3426 tree orig_op1 = op1, orig_op2 = op2;
3428 ifexp = truthvalue_conversion (default_conversion (ifexp));
3430 #if 0 /* Produces wrong result if within sizeof. */
3431 /* Don't promote the operands separately if they promote
3432 the same way. Return the unpromoted type and let the combined
3433 value get promoted if necessary. */
3435 if (TREE_TYPE (op1) == TREE_TYPE (op2)
3436 && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE
3437 && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE
3438 && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE)
3440 if (TREE_CODE (ifexp) == INTEGER_CST)
3441 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3443 return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2));
3447 /* Promote both alternatives. */
3449 if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE)
3450 op1 = default_conversion (op1);
3451 if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE)
3452 op2 = default_conversion (op2);
3454 if (TREE_CODE (ifexp) == ERROR_MARK
3455 || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK
3456 || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK)
3457 return error_mark_node;
3459 type1 = TREE_TYPE (op1);
3460 code1 = TREE_CODE (type1);
3461 type2 = TREE_TYPE (op2);
3462 code2 = TREE_CODE (type2);
3464 /* Quickly detect the usual case where op1 and op2 have the same type
3466 if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2))
3469 result_type = type1;
3471 result_type = TYPE_MAIN_VARIANT (type1);
3473 else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE)
3474 && (code2 == INTEGER_TYPE || code2 == REAL_TYPE))
3476 result_type = common_type (type1, type2);
3478 else if (code1 == VOID_TYPE || code2 == VOID_TYPE)
3480 if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE))
3481 pedwarn ("ANSI C forbids conditional expr with only one void side");
3482 result_type = void_type_node;
3484 else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE)
3486 if (comp_target_types (type1, type2))
3487 result_type = common_type (type1, type2);
3488 else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node
3489 && TREE_CODE (orig_op1) != NOP_EXPR)
3490 result_type = qualify_type (type2, type1);
3491 else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node
3492 && TREE_CODE (orig_op2) != NOP_EXPR)
3493 result_type = qualify_type (type1, type2);
3494 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node)
3496 if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE)
3497 pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer");
3498 result_type = qualify_type (type1, type2);
3500 else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node)
3502 if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE)
3503 pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer");
3504 result_type = qualify_type (type2, type1);
3508 pedwarn ("pointer type mismatch in conditional expression");
3509 result_type = build_pointer_type (void_type_node);
3512 else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE)
3514 if (! integer_zerop (op2))
3515 pedwarn ("pointer/integer type mismatch in conditional expression");
3518 op2 = null_pointer_node;
3519 #if 0 /* The spec seems to say this is permitted. */
3520 if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE)
3521 pedwarn ("ANSI C forbids conditional expr between 0 and function pointer");
3524 result_type = type1;
3526 else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE)
3528 if (!integer_zerop (op1))
3529 pedwarn ("pointer/integer type mismatch in conditional expression");
3532 op1 = null_pointer_node;
3533 #if 0 /* The spec seems to say this is permitted. */
3534 if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE)
3535 pedwarn ("ANSI C forbids conditional expr between 0 and function pointer");
3538 result_type = type2;
3543 if (flag_cond_mismatch)
3544 result_type = void_type_node;
3547 error ("type mismatch in conditional expression");
3548 return error_mark_node;
3552 /* Merge const and volatile flags of the incoming types. */
3554 = build_type_variant (result_type,
3555 TREE_READONLY (op1) || TREE_READONLY (op2),
3556 TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2));
3558 if (result_type != TREE_TYPE (op1))
3559 op1 = convert_and_check (result_type, op1);
3560 if (result_type != TREE_TYPE (op2))
3561 op2 = convert_and_check (result_type, op2);
3564 if (code1 == RECORD_TYPE || code1 == UNION_TYPE)
3566 result_type = TREE_TYPE (op1);
3567 if (TREE_CONSTANT (ifexp))
3568 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3570 if (TYPE_MODE (result_type) == BLKmode)
3572 register tree tempvar
3573 = build_decl (VAR_DECL, NULL_TREE, result_type);
3574 register tree xop1 = build_modify_expr (tempvar, op1);
3575 register tree xop2 = build_modify_expr (tempvar, op2);
3576 register tree result = fold (build (COND_EXPR, result_type,
3577 ifexp, xop1, xop2));
3579 layout_decl (tempvar, TYPE_ALIGN (result_type));
3580 /* No way to handle variable-sized objects here.
3581 I fear that the entire handling of BLKmode conditional exprs
3582 needs to be redone. */
3583 if (TREE_CODE (DECL_SIZE (tempvar)) != INTEGER_CST)
3586 = assign_stack_local (DECL_MODE (tempvar),
3587 (TREE_INT_CST_LOW (DECL_SIZE (tempvar))
3588 + BITS_PER_UNIT - 1)
3592 TREE_SIDE_EFFECTS (result)
3593 = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1)
3594 | TREE_SIDE_EFFECTS (op2);
3595 return build (COMPOUND_EXPR, result_type, result, tempvar);
3600 if (TREE_CODE (ifexp) == INTEGER_CST)
3601 return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1);
3603 return fold (build (COND_EXPR, result_type, ifexp, op1, op2));
3606 /* Given a list of expressions, return a compound expression
3607 that performs them all and returns the value of the last of them. */
3610 build_compound_expr (list)
3613 return internal_build_compound_expr (list, TRUE);
3617 internal_build_compound_expr (list, first_p)
3623 if (TREE_CHAIN (list) == 0)
3625 #if 0 /* If something inside inhibited lvalueness, we should not override. */
3626 /* Consider (x, y+0), which is not an lvalue since y+0 is not. */
3628 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3629 if (TREE_CODE (list) == NON_LVALUE_EXPR)
3630 list = TREE_OPERAND (list, 0);
3633 /* Don't let (0, 0) be null pointer constant. */
3634 if (!first_p && integer_zerop (TREE_VALUE (list)))
3635 return non_lvalue (TREE_VALUE (list));
3636 return TREE_VALUE (list);
3639 if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0)
3641 /* Convert arrays to pointers when there really is a comma operator. */
3642 if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE)
3643 TREE_VALUE (TREE_CHAIN (list))
3644 = default_conversion (TREE_VALUE (TREE_CHAIN (list)));
3647 rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE);
3649 if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)))
3651 /* The left-hand operand of a comma expression is like an expression
3652 statement: with -W or -Wunused, we should warn if it doesn't have
3653 any side-effects, unless it was explicitly cast to (void). */
3654 if ((extra_warnings || warn_unused)
3655 && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR
3656 && TREE_TYPE (TREE_VALUE (list)) == void_type_node))
3657 warning ("left-hand operand of comma expression has no effect");
3659 /* When pedantic, a compound expression can be neither an lvalue
3660 nor an integer constant expression. */
3665 /* With -Wunused, we should also warn if the left-hand operand does have
3666 side-effects, but computes a value which is not used. For example, in
3667 `foo() + bar(), baz()' the result of the `+' operator is not used,
3668 so we should issue a warning. */
3669 else if (warn_unused)
3670 warn_if_unused_value (TREE_VALUE (list));
3672 return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest);
3675 /* Build an expression representing a cast to type TYPE of expression EXPR. */
3678 build_c_cast (type, expr)
3682 register tree value = expr;
3684 if (type == error_mark_node || expr == error_mark_node)
3685 return error_mark_node;
3686 type = TYPE_MAIN_VARIANT (type);
3689 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3690 if (TREE_CODE (value) == NON_LVALUE_EXPR)
3691 value = TREE_OPERAND (value, 0);
3694 if (TREE_CODE (type) == ARRAY_TYPE)
3696 error ("cast specifies array type");
3697 return error_mark_node;
3700 if (TREE_CODE (type) == FUNCTION_TYPE)
3702 error ("cast specifies function type");
3703 return error_mark_node;
3706 if (type == TREE_TYPE (value))
3710 if (TREE_CODE (type) == RECORD_TYPE
3711 || TREE_CODE (type) == UNION_TYPE)
3712 pedwarn ("ANSI C forbids casting nonscalar to the same type");
3715 else if (TREE_CODE (type) == UNION_TYPE)
3718 if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
3719 || TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE)
3720 value = default_conversion (value);
3722 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3723 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)),
3724 TYPE_MAIN_VARIANT (TREE_TYPE (value))))
3733 pedwarn ("ANSI C forbids casts to union type");
3734 if (TYPE_NAME (type) != 0)
3736 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3737 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3739 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3743 t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE,
3744 build_tree_list (field, value)),
3746 TREE_CONSTANT (t) = TREE_CONSTANT (value);
3749 error ("cast to union type from type not present in union");
3750 return error_mark_node;
3756 /* If casting to void, avoid the error that would come
3757 from default_conversion in the case of a non-lvalue array. */
3758 if (type == void_type_node)
3759 return build1 (CONVERT_EXPR, type, value);
3761 /* Convert functions and arrays to pointers,
3762 but don't convert any other types. */
3763 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
3764 || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE)
3765 value = default_conversion (value);
3766 otype = TREE_TYPE (value);
3768 /* Optionally warn about potentially worrisome casts. */
3771 && TREE_CODE (type) == POINTER_TYPE
3772 && TREE_CODE (otype) == POINTER_TYPE)
3774 /* Go to the innermost object being pointed to. */
3775 tree in_type = type;
3776 tree in_otype = otype;
3778 while (TREE_CODE (in_type) == POINTER_TYPE)
3779 in_type = TREE_TYPE (in_type);
3780 while (TREE_CODE (in_otype) == POINTER_TYPE)
3781 in_otype = TREE_TYPE (in_otype);
3783 if (TYPE_VOLATILE (in_otype) && ! TYPE_VOLATILE (in_type))
3784 pedwarn ("cast discards `volatile' from pointer target type");
3785 if (TYPE_READONLY (in_otype) && ! TYPE_READONLY (in_type))
3786 pedwarn ("cast discards `const' from pointer target type");
3789 /* Warn about possible alignment problems. */
3790 if (STRICT_ALIGNMENT && warn_cast_align
3791 && TREE_CODE (type) == POINTER_TYPE
3792 && TREE_CODE (otype) == POINTER_TYPE
3793 && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE
3794 && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE
3795 /* Don't warn about opaque types, where the actual alignment
3796 restriction is unknown. */
3797 && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE
3798 || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE)
3799 && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode)
3800 && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype)))
3801 warning ("cast increases required alignment of target type");
3803 if (TREE_CODE (type) == INTEGER_TYPE
3804 && TREE_CODE (otype) == POINTER_TYPE
3805 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3806 && !TREE_CONSTANT (value))
3807 warning ("cast from pointer to integer of different size");
3809 if (warn_bad_function_cast
3810 && TREE_CODE (value) == CALL_EXPR
3811 && TREE_CODE (type) != TREE_CODE (otype))
3812 warning ("cast does not match function type");
3814 if (TREE_CODE (type) == POINTER_TYPE
3815 && TREE_CODE (otype) == INTEGER_TYPE
3816 && TYPE_PRECISION (type) != TYPE_PRECISION (otype)
3818 /* Don't warn about converting 0 to pointer,
3819 provided the 0 was explicit--not cast or made by folding. */
3820 && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))
3822 /* Don't warn about converting any constant. */
3823 && !TREE_CONSTANT (value))
3824 warning ("cast to pointer from integer of different size");
3827 value = convert (type, value);
3829 /* Ignore any integer overflow caused by the cast. */
3830 if (TREE_CODE (value) == INTEGER_CST)
3832 TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue);
3833 TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue);
3837 /* Pedantically, don't ley (void *) (FOO *) 0 be a null pointer constant. */
3838 if (pedantic && TREE_CODE (value) == INTEGER_CST
3839 && TREE_CODE (expr) == INTEGER_CST
3840 && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE)
3841 value = non_lvalue (value);
3843 /* If pedantic, don't let a cast be an lvalue. */
3844 if (value == expr && pedantic)
3845 value = non_lvalue (value);
3850 /* Build an assignment expression of lvalue LHS from value RHS.
3851 MODIFYCODE is the code for a binary operator that we use
3852 to combine the old value of LHS with RHS to get the new value.
3853 Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */
3856 build_modify_expr (lhs, modifycode, rhs)
3858 enum tree_code modifycode;
3860 register tree result;
3862 tree lhstype = TREE_TYPE (lhs);
3863 tree olhstype = lhstype;
3865 /* Types that aren't fully specified cannot be used in assignments. */
3866 lhs = require_complete_type (lhs);
3868 /* Avoid duplicate error messages from operands that had errors. */
3869 if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK)
3870 return error_mark_node;
3872 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3873 /* Do not use STRIP_NOPS here. We do not want an enumerator
3874 whose value is 0 to count as a null pointer constant. */
3875 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
3876 rhs = TREE_OPERAND (rhs, 0);
3880 /* Handle control structure constructs used as "lvalues". */
3882 switch (TREE_CODE (lhs))
3884 /* Handle (a, b) used as an "lvalue". */
3886 pedantic_lvalue_warning (COMPOUND_EXPR);
3887 newrhs = build_modify_expr (TREE_OPERAND (lhs, 1),
3889 if (TREE_CODE (newrhs) == ERROR_MARK)
3890 return error_mark_node;
3891 return build (COMPOUND_EXPR, lhstype,
3892 TREE_OPERAND (lhs, 0), newrhs);
3894 /* Handle (a ? b : c) used as an "lvalue". */
3896 pedantic_lvalue_warning (COND_EXPR);
3897 rhs = save_expr (rhs);
3899 /* Produce (a ? (b = rhs) : (c = rhs))
3900 except that the RHS goes through a save-expr
3901 so the code to compute it is only emitted once. */
3903 = build_conditional_expr (TREE_OPERAND (lhs, 0),
3904 build_modify_expr (TREE_OPERAND (lhs, 1),
3906 build_modify_expr (TREE_OPERAND (lhs, 2),
3908 if (TREE_CODE (cond) == ERROR_MARK)
3910 /* Make sure the code to compute the rhs comes out
3911 before the split. */
3912 return build (COMPOUND_EXPR, TREE_TYPE (lhs),
3913 /* But cast it to void to avoid an "unused" error. */
3914 convert (void_type_node, rhs), cond);
3920 /* If a binary op has been requested, combine the old LHS value with the RHS
3921 producing the value we should actually store into the LHS. */
3923 if (modifycode != NOP_EXPR)
3925 lhs = stabilize_reference (lhs);
3926 newrhs = build_binary_op (modifycode, lhs, rhs, 1);
3929 /* Handle a cast used as an "lvalue".
3930 We have already performed any binary operator using the value as cast.
3931 Now convert the result to the cast type of the lhs,
3932 and then true type of the lhs and store it there;
3933 then convert result back to the cast type to be the value
3934 of the assignment. */
3936 switch (TREE_CODE (lhs))
3941 case FIX_TRUNC_EXPR:
3942 case FIX_FLOOR_EXPR:
3943 case FIX_ROUND_EXPR:
3945 if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE
3946 || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE)
3947 newrhs = default_conversion (newrhs);
3949 tree inner_lhs = TREE_OPERAND (lhs, 0);
3951 result = build_modify_expr (inner_lhs, NOP_EXPR,
3952 convert (TREE_TYPE (inner_lhs),
3953 convert (lhstype, newrhs)));
3954 if (TREE_CODE (result) == ERROR_MARK)
3956 pedantic_lvalue_warning (CONVERT_EXPR);
3957 return convert (TREE_TYPE (lhs), result);
3964 /* Now we have handled acceptable kinds of LHS that are not truly lvalues.
3965 Reject anything strange now. */
3967 if (!lvalue_or_else (lhs, "assignment"))
3968 return error_mark_node;
3970 /* Warn about storing in something that is `const'. */
3972 if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype)
3973 || ((TREE_CODE (lhstype) == RECORD_TYPE
3974 || TREE_CODE (lhstype) == UNION_TYPE)
3975 && C_TYPE_FIELDS_READONLY (lhstype)))
3976 readonly_warning (lhs, "assignment");
3978 /* If storing into a structure or union member,
3979 it has probably been given type `int'.
3980 Compute the type that would go with
3981 the actual amount of storage the member occupies. */
3983 if (TREE_CODE (lhs) == COMPONENT_REF
3984 && (TREE_CODE (lhstype) == INTEGER_TYPE
3985 || TREE_CODE (lhstype) == REAL_TYPE
3986 || TREE_CODE (lhstype) == ENUMERAL_TYPE))
3987 lhstype = TREE_TYPE (get_unwidened (lhs, 0));
3989 /* If storing in a field that is in actuality a short or narrower than one,
3990 we must store in the field in its actual type. */
3992 if (lhstype != TREE_TYPE (lhs))
3994 lhs = copy_node (lhs);
3995 TREE_TYPE (lhs) = lhstype;
3998 /* Convert new value to destination type. */
4000 newrhs = convert_for_assignment (lhstype, newrhs, "assignment",
4001 NULL_TREE, NULL_TREE, 0);
4002 if (TREE_CODE (newrhs) == ERROR_MARK)
4003 return error_mark_node;
4005 result = build (MODIFY_EXPR, lhstype, lhs, newrhs);
4006 TREE_SIDE_EFFECTS (result) = 1;
4008 /* If we got the LHS in a different type for storing in,
4009 convert the result back to the nominal type of LHS
4010 so that the value we return always has the same type
4011 as the LHS argument. */
4013 if (olhstype == TREE_TYPE (result))
4015 return convert_for_assignment (olhstype, result, "assignment",
4016 NULL_TREE, NULL_TREE, 0);
4019 /* Convert value RHS to type TYPE as preparation for an assignment
4020 to an lvalue of type TYPE.
4021 The real work of conversion is done by `convert'.
4022 The purpose of this function is to generate error messages
4023 for assignments that are not allowed in C.
4024 ERRTYPE is a string to use in error messages:
4025 "assignment", "return", etc. If it is null, this is parameter passing
4026 for a function call (and different error messages are output). Otherwise,
4027 it may be a name stored in the spelling stack and interpreted by
4030 FUNNAME is the name of the function being called,
4031 as an IDENTIFIER_NODE, or null.
4032 PARMNUM is the number of the argument, for printing in error messages. */
4035 convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum)
4038 tree fundecl, funname;
4041 register enum tree_code codel = TREE_CODE (type);
4042 register tree rhstype;
4043 register enum tree_code coder;
4045 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4046 /* Do not use STRIP_NOPS here. We do not want an enumerator
4047 whose value is 0 to count as a null pointer constant. */
4048 if (TREE_CODE (rhs) == NON_LVALUE_EXPR)
4049 rhs = TREE_OPERAND (rhs, 0);
4051 if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE
4052 || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE)
4053 rhs = default_conversion (rhs);
4054 else if (optimize && TREE_CODE (rhs) == VAR_DECL)
4055 rhs = decl_constant_value (rhs);
4057 rhstype = TREE_TYPE (rhs);
4058 coder = TREE_CODE (rhstype);
4060 if (coder == ERROR_MARK)
4061 return error_mark_node;
4063 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype))
4065 overflow_warning (rhs);
4066 /* Check for Objective-C protocols. This will issue a warning if
4067 there are protocol violations. No need to use the return value. */
4068 maybe_objc_comptypes (type, rhstype, 0);
4072 if (coder == VOID_TYPE)
4074 error ("void value not ignored as it ought to be");
4075 return error_mark_node;
4077 /* Arithmetic types all interconvert, and enum is treated like int. */
4078 if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == ENUMERAL_TYPE
4079 || codel == COMPLEX_TYPE)
4080 && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == ENUMERAL_TYPE
4081 || coder == COMPLEX_TYPE))
4082 return convert_and_check (type, rhs);
4084 /* Conversion to a transparent union from its member types.
4085 This applies only to function arguments. */
4086 else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype)
4089 tree marginal_memb_type = 0;
4091 for (memb_types = TYPE_FIELDS (type); memb_types;
4092 memb_types = TREE_CHAIN (memb_types))
4094 tree memb_type = TREE_TYPE (memb_types);
4096 if (comptypes (TYPE_MAIN_VARIANT (memb_type),
4097 TYPE_MAIN_VARIANT (rhstype)))
4100 if (TREE_CODE (memb_type) != POINTER_TYPE)
4103 if (coder == POINTER_TYPE)
4105 register tree ttl = TREE_TYPE (memb_type);
4106 register tree ttr = TREE_TYPE (rhstype);
4108 /* Any non-function converts to a [const][volatile] void *
4109 and vice versa; otherwise, targets must be the same.
4110 Meanwhile, the lhs target must have all the qualifiers of
4112 if (TYPE_MAIN_VARIANT (ttl) == void_type_node
4113 || TYPE_MAIN_VARIANT (ttr) == void_type_node
4114 || comp_target_types (memb_type, rhstype))
4116 /* If this type won't generate any warnings, use it. */
4117 if ((TREE_CODE (ttr) == FUNCTION_TYPE
4118 && TREE_CODE (ttl) == FUNCTION_TYPE)
4119 ? ((! TYPE_READONLY (ttl) | TYPE_READONLY (ttr))
4120 & (! TYPE_VOLATILE (ttl) | TYPE_VOLATILE (ttr)))
4121 : ((TYPE_READONLY (ttl) | ! TYPE_READONLY (ttr))
4122 & (TYPE_VOLATILE (ttl) | ! TYPE_VOLATILE (ttr))))
4125 /* Keep looking for a better type, but remember this one. */
4126 if (! marginal_memb_type)
4127 marginal_memb_type = memb_type;
4131 /* Can convert integer zero to any pointer type. */
4132 if (integer_zerop (rhs)
4133 || (TREE_CODE (rhs) == NOP_EXPR
4134 && integer_zerop (TREE_OPERAND (rhs, 0))))
4136 rhs = null_pointer_node;
4141 if (memb_types || marginal_memb_type)
4145 /* We have only a marginally acceptable member type;
4146 it needs a warning. */
4147 register tree ttl = TREE_TYPE (marginal_memb_type);
4148 register tree ttr = TREE_TYPE (rhstype);
4150 /* Const and volatile mean something different for function
4151 types, so the usual warnings are not appropriate. */
4152 if (TREE_CODE (ttr) == FUNCTION_TYPE
4153 && TREE_CODE (ttl) == FUNCTION_TYPE)
4155 /* Because const and volatile on functions are
4156 restrictions that say the function will not do
4157 certain things, it is okay to use a const or volatile
4158 function where an ordinary one is wanted, but not
4160 if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr))
4161 warn_for_assignment ("%s makes `const *' function pointer from non-const",
4162 get_spelling (errtype), funname,
4164 if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr))
4165 warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile",
4166 get_spelling (errtype), funname,
4171 if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr))
4172 warn_for_assignment ("%s discards `const' from pointer target type",
4173 get_spelling (errtype), funname,
4175 if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr))
4176 warn_for_assignment ("%s discards `volatile' from pointer target type",
4177 get_spelling (errtype), funname,
4182 if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl))
4183 pedwarn ("ANSI C prohibits argument conversion to union type");
4185 return build1 (NOP_EXPR, type, rhs);
4189 /* Conversions among pointers */
4190 else if (codel == POINTER_TYPE && coder == POINTER_TYPE)
4192 register tree ttl = TREE_TYPE (type);
4193 register tree ttr = TREE_TYPE (rhstype);
4195 /* Any non-function converts to a [const][volatile] void *
4196 and vice versa; otherwise, targets must be the same.
4197 Meanwhile, the lhs target must have all the qualifiers of the rhs. */
4198 if (TYPE_MAIN_VARIANT (ttl) == void_type_node
4199 || TYPE_MAIN_VARIANT (ttr) == void_type_node
4200 || comp_target_types (type, rhstype)
4201 || (unsigned_type (TYPE_MAIN_VARIANT (ttl))
4202 == unsigned_type (TYPE_MAIN_VARIANT (ttr))))
4205 && ((TYPE_MAIN_VARIANT (ttl) == void_type_node
4206 && TREE_CODE (ttr) == FUNCTION_TYPE)
4208 (TYPE_MAIN_VARIANT (ttr) == void_type_node
4209 /* Check TREE_CODE to catch cases like (void *) (char *) 0
4210 which are not ANSI null ptr constants. */
4211 && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR)
4212 && TREE_CODE (ttl) == FUNCTION_TYPE)))
4213 warn_for_assignment ("ANSI forbids %s between function pointer and `void *'",
4214 get_spelling (errtype), funname, parmnum);
4215 /* Const and volatile mean something different for function types,
4216 so the usual warnings are not appropriate. */
4217 else if (TREE_CODE (ttr) != FUNCTION_TYPE
4218 && TREE_CODE (ttl) != FUNCTION_TYPE)
4220 if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr))
4221 warn_for_assignment ("%s discards `const' from pointer target type",
4222 get_spelling (errtype), funname, parmnum);
4223 else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr))
4224 warn_for_assignment ("%s discards `volatile' from pointer target type",
4225 get_spelling (errtype), funname, parmnum);
4226 /* If this is not a case of ignoring a mismatch in signedness,
4228 else if (TYPE_MAIN_VARIANT (ttl) == void_type_node
4229 || TYPE_MAIN_VARIANT (ttr) == void_type_node
4230 || comp_target_types (type, rhstype))
4232 /* If there is a mismatch, do warn. */
4234 warn_for_assignment ("pointer targets in %s differ in signedness",
4235 get_spelling (errtype), funname, parmnum);
4237 else if (TREE_CODE (ttl) == FUNCTION_TYPE
4238 && TREE_CODE (ttr) == FUNCTION_TYPE)
4240 /* Because const and volatile on functions are restrictions
4241 that say the function will not do certain things,
4242 it is okay to use a const or volatile function
4243 where an ordinary one is wanted, but not vice-versa. */
4244 if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr))
4245 warn_for_assignment ("%s makes `const *' function pointer from non-const",
4246 get_spelling (errtype), funname, parmnum);
4247 if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr))
4248 warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile",
4249 get_spelling (errtype), funname, parmnum);
4253 warn_for_assignment ("%s from incompatible pointer type",
4254 get_spelling (errtype), funname, parmnum);
4255 return convert (type, rhs);
4257 else if (codel == POINTER_TYPE && coder == INTEGER_TYPE)
4259 /* An explicit constant 0 can convert to a pointer,
4260 or one that results from arithmetic, even including
4261 a cast to integer type. */
4262 if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))
4264 ! (TREE_CODE (rhs) == NOP_EXPR
4265 && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
4266 && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST
4267 && integer_zerop (TREE_OPERAND (rhs, 0))))
4269 warn_for_assignment ("%s makes pointer from integer without a cast",
4270 get_spelling (errtype), funname, parmnum);
4271 return convert (type, rhs);
4273 return null_pointer_node;
4275 else if (codel == INTEGER_TYPE && coder == POINTER_TYPE)
4277 warn_for_assignment ("%s makes integer from pointer without a cast",
4278 get_spelling (errtype), funname, parmnum);
4279 return convert (type, rhs);
4286 tree selector = maybe_building_objc_message_expr ();
4288 if (selector && parmnum > 2)
4289 error ("incompatible type for argument %d of `%s'",
4290 parmnum - 2, IDENTIFIER_POINTER (selector));
4292 error ("incompatible type for argument %d of `%s'",
4293 parmnum, IDENTIFIER_POINTER (funname));
4296 error ("incompatible type for argument %d of indirect function call",
4300 error ("incompatible types in %s", get_spelling (errtype));
4302 return error_mark_node;
4305 /* Print a warning using MSG.
4306 It gets OPNAME as its one parameter.
4307 If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'".
4308 FUNCTION and ARGNUM are handled specially if we are building an
4309 Objective-C selector. */
4312 warn_for_assignment (msg, opname, function, argnum)
4318 static char argstring[] = "passing arg %d of `%s'";
4319 static char argnofun[] = "passing arg %d";
4323 tree selector = maybe_building_objc_message_expr ();
4325 if (selector && argnum > 2)
4327 function = selector;
4332 /* Function name is known; supply it. */
4333 opname = (char *) alloca (IDENTIFIER_LENGTH (function)
4334 + sizeof (argstring) + 25 /*%d*/ + 1);
4335 sprintf (opname, argstring, argnum, IDENTIFIER_POINTER (function));
4339 /* Function name unknown (call through ptr); just give arg number. */
4340 opname = (char *) alloca (sizeof (argnofun) + 25 /*%d*/ + 1);
4341 sprintf (opname, argnofun, argnum);
4344 pedwarn (msg, opname);
4347 /* Return nonzero if VALUE is a valid constant-valued expression
4348 for use in initializing a static variable; one that can be an
4349 element of a "constant" initializer.
4351 Return null_pointer_node if the value is absolute;
4352 if it is relocatable, return the variable that determines the relocation.
4353 We assume that VALUE has been folded as much as possible;
4354 therefore, we do not need to check for such things as
4355 arithmetic-combinations of integers. */
4358 initializer_constant_valid_p (value, endtype)
4362 switch (TREE_CODE (value))
4365 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
4366 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
4367 && TREE_CONSTANT (value)
4368 && CONSTRUCTOR_ELTS (value))
4370 initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)),
4373 return TREE_STATIC (value) ? null_pointer_node : 0;
4379 return null_pointer_node;
4382 return TREE_OPERAND (value, 0);
4384 case NON_LVALUE_EXPR:
4385 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4389 /* Allow conversions between pointer types. */
4390 if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE
4391 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE)
4392 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4394 /* Allow conversions between real types. */
4395 if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE
4396 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE)
4397 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4399 /* Allow length-preserving conversions between integer types. */
4400 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4401 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE
4402 && (TYPE_PRECISION (TREE_TYPE (value))
4403 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4404 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4406 /* Allow conversions between other integer types only if
4408 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4409 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE)
4411 tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4413 if (inner == null_pointer_node)
4414 return null_pointer_node;
4418 /* Allow (int) &foo provided int is as wide as a pointer. */
4419 if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE
4420 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE
4421 && (TYPE_PRECISION (TREE_TYPE (value))
4422 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4423 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4426 /* Likewise conversions from int to pointers. */
4427 if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE
4428 && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE
4429 && (TYPE_PRECISION (TREE_TYPE (value))
4430 <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
4431 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4434 /* Allow conversions to union types if the value inside is okay. */
4435 if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE)
4436 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
4441 if (TREE_CODE (endtype) == INTEGER_TYPE
4442 && TYPE_PRECISION (endtype) < POINTER_SIZE)
4445 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4447 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4449 /* If either term is absolute, use the other terms relocation. */
4450 if (valid0 == null_pointer_node)
4452 if (valid1 == null_pointer_node)
4458 if (TREE_CODE (endtype) == INTEGER_TYPE
4459 && TYPE_PRECISION (endtype) < POINTER_SIZE)
4462 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4464 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4466 /* Win if second argument is absolute. */
4467 if (valid1 == null_pointer_node)
4469 /* Win if both arguments have the same relocation.
4470 Then the value is absolute. */
4471 if (valid0 == valid1)
4472 return null_pointer_node;
4481 /* If VALUE is a compound expr all of whose expressions are constant, then
4482 return its value. Otherwise, return error_mark_node.
4484 This is for handling COMPOUND_EXPRs as initializer elements
4485 which is allowed with a warning when -pedantic is specified. */
4488 valid_compound_expr_initializer (value, endtype)
4492 if (TREE_CODE (value) == COMPOUND_EXPR)
4494 if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype)
4496 return error_mark_node;
4497 return valid_compound_expr_initializer (TREE_OPERAND (value, 1),
4500 else if (! TREE_CONSTANT (value)
4501 && ! initializer_constant_valid_p (value, endtype))
4502 return error_mark_node;
4507 /* Perform appropriate conversions on the initial value of a variable,
4508 store it in the declaration DECL,
4509 and print any error messages that are appropriate.
4510 If the init is invalid, store an ERROR_MARK. */
4513 store_init_value (decl, init)
4516 register tree value, type;
4518 /* If variable's type was invalidly declared, just ignore it. */
4520 type = TREE_TYPE (decl);
4521 if (TREE_CODE (type) == ERROR_MARK)
4524 /* Digest the specified initializer into an expression. */
4526 value = digest_init (type, init, TREE_STATIC (decl),
4527 TREE_STATIC (decl) || pedantic);
4529 /* Store the expression if valid; else report error. */
4532 /* Note that this is the only place we can detect the error
4533 in a case such as struct foo bar = (struct foo) { x, y };
4534 where there is one initial value which is a constructor expression. */
4535 if (value == error_mark_node)
4537 else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value))
4539 error ("initializer for static variable is not constant");
4540 value = error_mark_node;
4542 else if (TREE_STATIC (decl)
4543 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
4545 error ("initializer for static variable uses complicated arithmetic");
4546 value = error_mark_node;
4550 if (pedantic && TREE_CODE (value) == CONSTRUCTOR)
4552 if (! TREE_CONSTANT (value))
4553 pedwarn ("aggregate initializer is not constant");
4554 else if (! TREE_STATIC (value))
4555 pedwarn ("aggregate initializer uses complicated arithmetic");
4560 DECL_INITIAL (decl) = value;
4562 /* ANSI wants warnings about out-of-range constant initializers. */
4563 STRIP_TYPE_NOPS (value);
4564 constant_expression_warning (value);
4567 /* Methods for storing and printing names for error messages. */
4569 /* Implement a spelling stack that allows components of a name to be pushed
4570 and popped. Each element on the stack is this structure. */
4582 #define SPELLING_STRING 1
4583 #define SPELLING_MEMBER 2
4584 #define SPELLING_BOUNDS 3
4586 static struct spelling *spelling; /* Next stack element (unused). */
4587 static struct spelling *spelling_base; /* Spelling stack base. */
4588 static int spelling_size; /* Size of the spelling stack. */
4590 /* Macros to save and restore the spelling stack around push_... functions.
4591 Alternative to SAVE_SPELLING_STACK. */
4593 #define SPELLING_DEPTH() (spelling - spelling_base)
4594 #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth)
4596 /* Save and restore the spelling stack around arbitrary C code. */
4598 #define SAVE_SPELLING_DEPTH(code) \
4600 int __depth = SPELLING_DEPTH (); \
4602 RESTORE_SPELLING_DEPTH (__depth); \
4605 /* Push an element on the spelling stack with type KIND and assign VALUE
4608 #define PUSH_SPELLING(KIND, VALUE, MEMBER) \
4610 int depth = SPELLING_DEPTH (); \
4612 if (depth >= spelling_size) \
4614 spelling_size += 10; \
4615 if (spelling_base == 0) \
4617 = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \
4620 = (struct spelling *) xrealloc (spelling_base, \
4621 spelling_size * sizeof (struct spelling)); \
4622 RESTORE_SPELLING_DEPTH (depth); \
4625 spelling->kind = (KIND); \
4626 spelling->MEMBER = (VALUE); \
4630 /* Push STRING on the stack. Printed literally. */
4633 push_string (string)
4636 PUSH_SPELLING (SPELLING_STRING, string, u.s);
4639 /* Push a member name on the stack. Printed as '.' STRING. */
4642 push_member_name (decl)
4647 = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>";
4648 PUSH_SPELLING (SPELLING_MEMBER, string, u.s);
4651 /* Push an array bounds on the stack. Printed as [BOUNDS]. */
4654 push_array_bounds (bounds)
4657 PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i);
4660 /* Compute the maximum size in bytes of the printed spelling. */
4665 register int size = 0;
4666 register struct spelling *p;
4668 for (p = spelling_base; p < spelling; p++)
4670 if (p->kind == SPELLING_BOUNDS)
4673 size += strlen (p->u.s) + 1;
4679 /* Print the spelling to BUFFER and return it. */
4682 print_spelling (buffer)
4683 register char *buffer;
4685 register char *d = buffer;
4687 register struct spelling *p;
4689 for (p = spelling_base; p < spelling; p++)
4690 if (p->kind == SPELLING_BOUNDS)
4692 sprintf (d, "[%d]", p->u.i);
4697 if (p->kind == SPELLING_MEMBER)
4699 for (s = p->u.s; (*d = *s++); d++)
4706 /* Provide a means to pass component names derived from the spelling stack. */
4708 char initialization_message;
4710 /* Interpret the spelling of the given ERRTYPE message. */
4713 get_spelling (errtype)
4716 static char *buffer;
4717 static int size = -1;
4719 if (errtype == &initialization_message)
4721 /* Avoid counting chars */
4722 static char message[] = "initialization of `%s'";
4723 register int needed = sizeof (message) + spelling_length () + 1;
4727 buffer = (char *) xmalloc (size = needed);
4729 buffer = (char *) xrealloc (buffer, size = needed);
4731 temp = (char *) alloca (needed);
4732 sprintf (buffer, message, print_spelling (temp));
4739 /* Issue an error message for a bad initializer component.
4740 FORMAT describes the message. OFWHAT is the name for the component.
4741 LOCAL is a format string for formatting the insertion of the name
4744 If OFWHAT is null, the component name is stored on the spelling stack.
4745 If the component name is a null string, then LOCAL is omitted entirely. */
4748 error_init (format, local, ofwhat)
4749 char *format, *local, *ofwhat;
4754 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4755 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4758 sprintf (buffer, local, ofwhat);
4762 error (format, buffer);
4765 /* Issue a pedantic warning for a bad initializer component.
4766 FORMAT describes the message. OFWHAT is the name for the component.
4767 LOCAL is a format string for formatting the insertion of the name
4770 If OFWHAT is null, the component name is stored on the spelling stack.
4771 If the component name is a null string, then LOCAL is omitted entirely. */
4774 pedwarn_init (format, local, ofwhat)
4775 char *format, *local, *ofwhat;
4780 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4781 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4784 sprintf (buffer, local, ofwhat);
4788 pedwarn (format, buffer);
4791 /* Issue a warning for a bad initializer component.
4792 FORMAT describes the message. OFWHAT is the name for the component.
4793 LOCAL is a format string for formatting the insertion of the name
4796 If OFWHAT is null, the component name is stored on the spelling stack.
4797 If the component name is a null string, then LOCAL is omitted entirely. */
4800 warning_init (format, local, ofwhat)
4801 char *format, *local, *ofwhat;
4806 ofwhat = print_spelling ((char *) alloca (spelling_length () + 1));
4807 buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2);
4810 sprintf (buffer, local, ofwhat);
4814 warning (format, buffer);
4817 /* Digest the parser output INIT as an initializer for type TYPE.
4818 Return a C expression of type TYPE to represent the initial value.
4820 The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors
4821 if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT
4822 applies only to elements of constructors. */
4825 digest_init (type, init, require_constant, constructor_constant)
4827 int require_constant, constructor_constant;
4829 enum tree_code code = TREE_CODE (type);
4830 tree inside_init = init;
4832 if (init == error_mark_node)
4835 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4836 /* Do not use STRIP_NOPS here. We do not want an enumerator
4837 whose value is 0 to count as a null pointer constant. */
4838 if (TREE_CODE (init) == NON_LVALUE_EXPR)
4839 inside_init = TREE_OPERAND (init, 0);
4841 /* Initialization of an array of chars from a string constant
4842 optionally enclosed in braces. */
4844 if (code == ARRAY_TYPE)
4846 tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type));
4847 if ((typ1 == char_type_node
4848 || typ1 == signed_char_type_node
4849 || typ1 == unsigned_char_type_node
4850 || typ1 == unsigned_wchar_type_node
4851 || typ1 == signed_wchar_type_node)
4852 && ((inside_init && TREE_CODE (inside_init) == STRING_CST)))
4854 if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4855 TYPE_MAIN_VARIANT (type)))
4858 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4860 && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node))
4862 error_init ("char-array%s initialized from wide string",
4864 return error_mark_node;
4866 if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init)))
4868 && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node))
4870 error_init ("int-array%s initialized from non-wide string",
4872 return error_mark_node;
4875 TREE_TYPE (inside_init) = type;
4876 if (TYPE_DOMAIN (type) != 0
4877 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST)
4879 register int size = TREE_INT_CST_LOW (TYPE_SIZE (type));
4880 size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
4881 /* Subtract 1 (or sizeof (wchar_t))
4882 because it's ok to ignore the terminating null char
4883 that is counted in the length of the constant. */
4884 if (size < TREE_STRING_LENGTH (inside_init)
4885 - (TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)
4886 ? TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT
4889 "initializer-string for array of chars%s is too long",
4896 /* Any type can be initialized
4897 from an expression of the same type, optionally with braces. */
4899 if (inside_init && TREE_TYPE (inside_init) != 0
4900 && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)),
4901 TYPE_MAIN_VARIANT (type))
4902 || (code == ARRAY_TYPE
4903 && comptypes (TREE_TYPE (inside_init), type))
4904 || (code == POINTER_TYPE
4905 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4906 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)
4907 && comptypes (TREE_TYPE (TREE_TYPE (inside_init)),
4908 TREE_TYPE (type)))))
4910 if (code == POINTER_TYPE
4911 && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE
4912 || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE))
4913 inside_init = default_conversion (inside_init);
4914 else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST
4915 && TREE_CODE (inside_init) != CONSTRUCTOR)
4917 error_init ("array%s initialized from non-constant array expression",
4919 return error_mark_node;
4922 if (optimize && TREE_CODE (inside_init) == VAR_DECL)
4923 inside_init = decl_constant_value (inside_init);
4925 /* Compound expressions can only occur here if -pedantic or
4926 -pedantic-errors is specified. In the later case, we always want
4927 an error. In the former case, we simply want a warning. */
4928 if (require_constant && pedantic
4929 && TREE_CODE (inside_init) == COMPOUND_EXPR)
4932 = valid_compound_expr_initializer (inside_init,
4933 TREE_TYPE (inside_init));
4934 if (inside_init == error_mark_node)
4935 error_init ("initializer element%s is not constant",
4938 pedwarn_init ("initializer element%s is not constant",
4940 if (flag_pedantic_errors)
4941 inside_init = error_mark_node;
4943 else if (require_constant && ! TREE_CONSTANT (inside_init))
4945 error_init ("initializer element%s is not constant",
4947 inside_init = error_mark_node;
4949 else if (require_constant
4950 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4952 error_init ("initializer element%s is not computable at load time",
4954 inside_init = error_mark_node;
4960 /* Handle scalar types, including conversions. */
4962 if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE
4963 || code == ENUMERAL_TYPE || code == COMPLEX_TYPE)
4965 /* Note that convert_for_assignment calls default_conversion
4966 for arrays and functions. We must not call it in the
4967 case where inside_init is a null pointer constant. */
4969 = convert_for_assignment (type, init, "initialization",
4970 NULL_TREE, NULL_TREE, 0);
4972 if (require_constant && ! TREE_CONSTANT (inside_init))
4974 error_init ("initializer element%s is not constant",
4976 inside_init = error_mark_node;
4978 else if (require_constant
4979 && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0)
4981 error_init ("initializer element%s is not computable at load time",
4983 inside_init = error_mark_node;
4989 /* Come here only for records and arrays. */
4991 if (TYPE_SIZE (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4993 error_init ("variable-sized object%s may not be initialized",
4995 return error_mark_node;
4998 /* Traditionally, you can write struct foo x = 0;
4999 and it initializes the first element of x to 0. */
5000 if (flag_traditional)
5002 tree top = 0, prev = 0, otype = type;
5003 while (TREE_CODE (type) == RECORD_TYPE
5004 || TREE_CODE (type) == ARRAY_TYPE
5005 || TREE_CODE (type) == QUAL_UNION_TYPE
5006 || TREE_CODE (type) == UNION_TYPE)
5008 tree temp = build (CONSTRUCTOR, type, NULL_TREE, NULL_TREE);
5012 TREE_OPERAND (prev, 1) = build_tree_list (NULL_TREE, temp);
5014 if (TREE_CODE (type) == ARRAY_TYPE)
5015 type = TREE_TYPE (type);
5016 else if (TYPE_FIELDS (type))
5017 type = TREE_TYPE (TYPE_FIELDS (type));
5020 error_init ("invalid initializer%s", " for `%s'", NULL);
5021 return error_mark_node;
5027 TREE_OPERAND (prev, 1)
5028 = build_tree_list (NULL_TREE,
5029 digest_init (type, init, require_constant,
5030 constructor_constant));
5034 return error_mark_node;
5036 error_init ("invalid initializer%s", " for `%s'", NULL);
5037 return error_mark_node;
5040 /* Handle initializers that use braces. */
5042 /* Type of object we are accumulating a constructor for.
5043 This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */
5044 static tree constructor_type;
5046 /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields
5048 static tree constructor_fields;
5050 /* For an ARRAY_TYPE, this is the specified index
5051 at which to store the next element we get.
5052 This is a special INTEGER_CST node that we modify in place. */
5053 static tree constructor_index;
5055 /* For an ARRAY_TYPE, this is the end index of the range
5056 to initialize with the next element, or NULL in the ordinary case
5057 where the element is used just once. */
5058 static tree constructor_range_end;
5060 /* For an ARRAY_TYPE, this is the maximum index. */
5061 static tree constructor_max_index;
5063 /* For a RECORD_TYPE, this is the first field not yet written out. */
5064 static tree constructor_unfilled_fields;
5066 /* For an ARRAY_TYPE, this is the index of the first element
5067 not yet written out.
5068 This is a special INTEGER_CST node that we modify in place. */
5069 static tree constructor_unfilled_index;
5071 /* In a RECORD_TYPE, the byte index of the next consecutive field.
5072 This is so we can generate gaps between fields, when appropriate.
5073 This is a special INTEGER_CST node that we modify in place. */
5074 static tree constructor_bit_index;
5076 /* If we are saving up the elements rather than allocating them,
5077 this is the list of elements so far (in reverse order,
5078 most recent first). */
5079 static tree constructor_elements;
5081 /* 1 if so far this constructor's elements are all compile-time constants. */
5082 static int constructor_constant;
5084 /* 1 if so far this constructor's elements are all valid address constants. */
5085 static int constructor_simple;
5087 /* 1 if this constructor is erroneous so far. */
5088 static int constructor_erroneous;
5090 /* 1 if have called defer_addressed_constants. */
5091 static int constructor_subconstants_deferred;
5093 /* Structure for managing pending initializer elements, organized as an
5098 struct init_node *left, *right;
5099 struct init_node *parent;
5105 /* Tree of pending elements at this constructor level.
5106 These are elements encountered out of order
5107 which belong at places we haven't reached yet in actually
5108 writing the output. */
5109 static struct init_node *constructor_pending_elts;
5111 /* The SPELLING_DEPTH of this constructor. */
5112 static int constructor_depth;
5114 /* 0 if implicitly pushing constructor levels is allowed. */
5115 int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */
5117 static int require_constant_value;
5118 static int require_constant_elements;
5120 /* 1 if it is ok to output this constructor as we read it.
5121 0 means must accumulate a CONSTRUCTOR expression. */
5122 static int constructor_incremental;
5124 /* DECL node for which an initializer is being read.
5125 0 means we are reading a constructor expression
5126 such as (struct foo) {...}. */
5127 static tree constructor_decl;
5129 /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */
5130 static char *constructor_asmspec;
5132 /* Nonzero if this is an initializer for a top-level decl. */
5133 static int constructor_top_level;
5136 /* This stack has a level for each implicit or explicit level of
5137 structuring in the initializer, including the outermost one. It
5138 saves the values of most of the variables above. */
5140 struct constructor_stack
5142 struct constructor_stack *next;
5148 tree unfilled_index;
5149 tree unfilled_fields;
5153 struct init_node *pending_elts;
5155 /* If nonzero, this value should replace the entire
5156 constructor at this level. */
5157 tree replacement_value;
5166 struct constructor_stack *constructor_stack;
5168 /* This stack records separate initializers that are nested.
5169 Nested initializers can't happen in ANSI C, but GNU C allows them
5170 in cases like { ... (struct foo) { ... } ... }. */
5172 struct initializer_stack
5174 struct initializer_stack *next;
5177 struct constructor_stack *constructor_stack;
5179 struct spelling *spelling;
5180 struct spelling *spelling_base;
5184 char require_constant_value;
5185 char require_constant_elements;
5189 struct initializer_stack *initializer_stack;
5191 /* Prepare to parse and output the initializer for variable DECL. */
5194 start_init (decl, asmspec_tree, top_level)
5200 struct initializer_stack *p
5201 = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack));
5205 asmspec = TREE_STRING_POINTER (asmspec_tree);
5207 p->decl = constructor_decl;
5208 p->asmspec = constructor_asmspec;
5209 p->incremental = constructor_incremental;
5210 p->require_constant_value = require_constant_value;
5211 p->require_constant_elements = require_constant_elements;
5212 p->constructor_stack = constructor_stack;
5213 p->elements = constructor_elements;
5214 p->spelling = spelling;
5215 p->spelling_base = spelling_base;
5216 p->spelling_size = spelling_size;
5217 p->deferred = constructor_subconstants_deferred;
5218 p->top_level = constructor_top_level;
5219 p->next = initializer_stack;
5220 initializer_stack = p;
5222 constructor_decl = decl;
5223 constructor_incremental = top_level;
5224 constructor_asmspec = asmspec;
5225 constructor_subconstants_deferred = 0;
5226 constructor_top_level = top_level;
5230 require_constant_value = TREE_STATIC (decl);
5231 require_constant_elements
5232 = ((TREE_STATIC (decl) || pedantic)
5233 /* For a scalar, you can always use any value to initialize,
5234 even within braces. */
5235 && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
5236 || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5237 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE
5238 || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE));
5239 locus = IDENTIFIER_POINTER (DECL_NAME (decl));
5240 constructor_incremental |= TREE_STATIC (decl);
5244 require_constant_value = 0;
5245 require_constant_elements = 0;
5246 locus = "(anonymous)";
5249 constructor_stack = 0;
5251 missing_braces_mentioned = 0;
5255 RESTORE_SPELLING_DEPTH (0);
5258 push_string (locus);
5264 struct initializer_stack *p = initializer_stack;
5266 /* Output subconstants (string constants, usually)
5267 that were referenced within this initializer and saved up.
5268 Must do this if and only if we called defer_addressed_constants. */
5269 if (constructor_subconstants_deferred)
5270 output_deferred_addressed_constants ();
5272 /* Free the whole constructor stack of this initializer. */
5273 while (constructor_stack)
5275 struct constructor_stack *q = constructor_stack;
5276 constructor_stack = q->next;
5280 /* Pop back to the data of the outer initializer (if any). */
5281 constructor_decl = p->decl;
5282 constructor_asmspec = p->asmspec;
5283 constructor_incremental = p->incremental;
5284 require_constant_value = p->require_constant_value;
5285 require_constant_elements = p->require_constant_elements;
5286 constructor_stack = p->constructor_stack;
5287 constructor_elements = p->elements;
5288 spelling = p->spelling;
5289 spelling_base = p->spelling_base;
5290 spelling_size = p->spelling_size;
5291 constructor_subconstants_deferred = p->deferred;
5292 constructor_top_level = p->top_level;
5293 initializer_stack = p->next;
5297 /* Call here when we see the initializer is surrounded by braces.
5298 This is instead of a call to push_init_level;
5299 it is matched by a call to pop_init_level.
5301 TYPE is the type to initialize, for a constructor expression.
5302 For an initializer for a decl, TYPE is zero. */
5305 really_start_incremental_init (type)
5308 struct constructor_stack *p
5309 = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5312 type = TREE_TYPE (constructor_decl);
5314 /* Turn off constructor_incremental if type is a struct with bitfields.
5315 Do this before the first push, so that the corrected value
5316 is available in finish_init. */
5317 check_init_type_bitfields (type);
5319 p->type = constructor_type;
5320 p->fields = constructor_fields;
5321 p->index = constructor_index;
5322 p->range_end = constructor_range_end;
5323 p->max_index = constructor_max_index;
5324 p->unfilled_index = constructor_unfilled_index;
5325 p->unfilled_fields = constructor_unfilled_fields;
5326 p->bit_index = constructor_bit_index;
5327 p->elements = constructor_elements;
5328 p->constant = constructor_constant;
5329 p->simple = constructor_simple;
5330 p->erroneous = constructor_erroneous;
5331 p->pending_elts = constructor_pending_elts;
5332 p->depth = constructor_depth;
5333 p->replacement_value = 0;
5335 p->incremental = constructor_incremental;
5338 constructor_stack = p;
5340 constructor_constant = 1;
5341 constructor_simple = 1;
5342 constructor_depth = SPELLING_DEPTH ();
5343 constructor_elements = 0;
5344 constructor_pending_elts = 0;
5345 constructor_type = type;
5347 if (TREE_CODE (constructor_type) == RECORD_TYPE
5348 || TREE_CODE (constructor_type) == UNION_TYPE)
5350 constructor_fields = TYPE_FIELDS (constructor_type);
5351 /* Skip any nameless bit fields at the beginning. */
5352 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5353 && DECL_NAME (constructor_fields) == 0)
5354 constructor_fields = TREE_CHAIN (constructor_fields);
5355 constructor_unfilled_fields = constructor_fields;
5356 constructor_bit_index = copy_node (integer_zero_node);
5357 TREE_TYPE (constructor_bit_index) = sbitsizetype;
5359 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5361 constructor_range_end = 0;
5362 if (TYPE_DOMAIN (constructor_type))
5364 constructor_max_index
5365 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5367 = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5370 constructor_index = copy_node (integer_zero_node);
5371 constructor_unfilled_index = copy_node (constructor_index);
5375 /* Handle the case of int x = {5}; */
5376 constructor_fields = constructor_type;
5377 constructor_unfilled_fields = constructor_type;
5380 if (constructor_incremental)
5382 int momentary = suspend_momentary ();
5383 push_obstacks_nochange ();
5384 if (TREE_PERMANENT (constructor_decl))
5385 end_temporary_allocation ();
5386 make_decl_rtl (constructor_decl, constructor_asmspec,
5387 constructor_top_level);
5388 assemble_variable (constructor_decl, constructor_top_level, 0, 1);
5390 resume_momentary (momentary);
5393 if (constructor_incremental)
5395 defer_addressed_constants ();
5396 constructor_subconstants_deferred = 1;
5400 /* Push down into a subobject, for initialization.
5401 If this is for an explicit set of braces, IMPLICIT is 0.
5402 If it is because the next element belongs at a lower level,
5406 push_init_level (implicit)
5409 struct constructor_stack *p;
5411 /* If we've exhausted any levels that didn't have braces,
5413 while (constructor_stack->implicit)
5415 if ((TREE_CODE (constructor_type) == RECORD_TYPE
5416 || TREE_CODE (constructor_type) == UNION_TYPE)
5417 && constructor_fields == 0)
5418 process_init_element (pop_init_level (1));
5419 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
5420 && tree_int_cst_lt (constructor_max_index, constructor_index))
5421 process_init_element (pop_init_level (1));
5426 /* Structure elements may require alignment. Do this now if necessary
5427 for the subaggregate, and if it comes next in sequence. Don't do
5428 this for subaggregates that will go on the pending list. */
5429 if (constructor_incremental && constructor_type != 0
5430 && TREE_CODE (constructor_type) == RECORD_TYPE && constructor_fields
5431 && constructor_fields == constructor_unfilled_fields)
5433 /* Advance to offset of this element. */
5434 if (! tree_int_cst_equal (constructor_bit_index,
5435 DECL_FIELD_BITPOS (constructor_fields)))
5437 /* By using unsigned arithmetic, the result will be correct even
5438 in case of overflows, if BITS_PER_UNIT is a power of two. */
5439 unsigned next = (TREE_INT_CST_LOW
5440 (DECL_FIELD_BITPOS (constructor_fields))
5441 / (unsigned)BITS_PER_UNIT);
5442 unsigned here = (TREE_INT_CST_LOW (constructor_bit_index)
5443 / (unsigned)BITS_PER_UNIT);
5445 assemble_zeros ((next - here)
5446 * (unsigned)BITS_PER_UNIT
5447 / (unsigned)BITS_PER_UNIT);
5449 /* Indicate that we have now filled the structure up to the current
5451 constructor_unfilled_fields = constructor_fields;
5454 p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack));
5455 p->type = constructor_type;
5456 p->fields = constructor_fields;
5457 p->index = constructor_index;
5458 p->range_end = constructor_range_end;
5459 p->max_index = constructor_max_index;
5460 p->unfilled_index = constructor_unfilled_index;
5461 p->unfilled_fields = constructor_unfilled_fields;
5462 p->bit_index = constructor_bit_index;
5463 p->elements = constructor_elements;
5464 p->constant = constructor_constant;
5465 p->simple = constructor_simple;
5466 p->erroneous = constructor_erroneous;
5467 p->pending_elts = constructor_pending_elts;
5468 p->depth = constructor_depth;
5469 p->replacement_value = 0;
5470 p->implicit = implicit;
5471 p->incremental = constructor_incremental;
5473 p->next = constructor_stack;
5474 constructor_stack = p;
5476 constructor_constant = 1;
5477 constructor_simple = 1;
5478 constructor_depth = SPELLING_DEPTH ();
5479 constructor_elements = 0;
5480 constructor_pending_elts = 0;
5482 /* Don't die if an entire brace-pair level is superfluous
5483 in the containing level. */
5484 if (constructor_type == 0)
5486 else if (TREE_CODE (constructor_type) == RECORD_TYPE
5487 || TREE_CODE (constructor_type) == UNION_TYPE)
5489 /* Don't die if there are extra init elts at the end. */
5490 if (constructor_fields == 0)
5491 constructor_type = 0;
5494 constructor_type = TREE_TYPE (constructor_fields);
5495 push_member_name (constructor_fields);
5496 constructor_depth++;
5497 if (constructor_fields != constructor_unfilled_fields)
5498 constructor_incremental = 0;
5501 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5503 constructor_type = TREE_TYPE (constructor_type);
5504 push_array_bounds (TREE_INT_CST_LOW (constructor_index));
5505 constructor_depth++;
5506 if (! tree_int_cst_equal (constructor_index, constructor_unfilled_index)
5507 || constructor_range_end != 0)
5508 constructor_incremental = 0;
5511 if (constructor_type == 0)
5513 error_init ("extra brace group at end of initializer%s",
5515 constructor_fields = 0;
5516 constructor_unfilled_fields = 0;
5520 /* Turn off constructor_incremental if type is a struct with bitfields. */
5521 check_init_type_bitfields (constructor_type);
5523 if (implicit && warn_missing_braces && !missing_braces_mentioned)
5525 missing_braces_mentioned = 1;
5526 warning_init ("missing braces around initializer%s", " for `%s'", NULL);
5529 if (TREE_CODE (constructor_type) == RECORD_TYPE
5530 || TREE_CODE (constructor_type) == UNION_TYPE)
5532 constructor_fields = TYPE_FIELDS (constructor_type);
5533 /* Skip any nameless bit fields at the beginning. */
5534 while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields)
5535 && DECL_NAME (constructor_fields) == 0)
5536 constructor_fields = TREE_CHAIN (constructor_fields);
5537 constructor_unfilled_fields = constructor_fields;
5538 constructor_bit_index = copy_node (integer_zero_node);
5539 TREE_TYPE (constructor_bit_index) = sbitsizetype;
5541 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5543 constructor_range_end = 0;
5544 if (TYPE_DOMAIN (constructor_type))
5546 constructor_max_index
5547 = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type));
5549 = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type)));
5552 constructor_index = copy_node (integer_zero_node);
5553 constructor_unfilled_index = copy_node (constructor_index);
5557 warning_init ("braces around scalar initializer%s", " for `%s'", NULL);
5558 constructor_fields = constructor_type;
5559 constructor_unfilled_fields = constructor_type;
5563 /* Don't read a struct incrementally if it has any bitfields,
5564 because the incremental reading code doesn't know how to
5565 handle bitfields yet. */
5568 check_init_type_bitfields (type)
5571 if (TREE_CODE (type) == RECORD_TYPE)
5574 for (tail = TYPE_FIELDS (type); tail;
5575 tail = TREE_CHAIN (tail))
5577 if (DECL_C_BIT_FIELD (tail)
5578 /* This catches cases like `int foo : 8;'. */
5579 || DECL_MODE (tail) != TYPE_MODE (TREE_TYPE (tail)))
5581 constructor_incremental = 0;
5585 check_init_type_bitfields (TREE_TYPE (tail));
5589 else if (TREE_CODE (type) == ARRAY_TYPE)
5590 check_init_type_bitfields (TREE_TYPE (type));
5593 /* At the end of an implicit or explicit brace level,
5594 finish up that level of constructor.
5595 If we were outputting the elements as they are read, return 0
5596 from inner levels (process_init_element ignores that),
5597 but return error_mark_node from the outermost level
5598 (that's what we want to put in DECL_INITIAL).
5599 Otherwise, return a CONSTRUCTOR expression. */
5602 pop_init_level (implicit)
5605 struct constructor_stack *p;
5607 tree constructor = 0;
5611 /* When we come to an explicit close brace,
5612 pop any inner levels that didn't have explicit braces. */
5613 while (constructor_stack->implicit)
5614 process_init_element (pop_init_level (1));
5617 p = constructor_stack;
5619 if (constructor_type != 0)
5620 size = int_size_in_bytes (constructor_type);
5622 /* Now output all pending elements. */
5623 output_pending_init_elements (1);
5625 #if 0 /* c-parse.in warns about {}. */
5626 /* In ANSI, each brace level must have at least one element. */
5627 if (! implicit && pedantic
5628 && (TREE_CODE (constructor_type) == ARRAY_TYPE
5629 ? integer_zerop (constructor_unfilled_index)
5630 : constructor_unfilled_fields == TYPE_FIELDS (constructor_type)))
5631 pedwarn_init ("empty braces in initializer%s", " for `%s'", NULL);
5634 /* Pad out the end of the structure. */
5636 if (p->replacement_value)
5638 /* If this closes a superfluous brace pair,
5639 just pass out the element between them. */
5640 constructor = p->replacement_value;
5641 /* If this is the top level thing within the initializer,
5642 and it's for a variable, then since we already called
5643 assemble_variable, we must output the value now. */
5644 if (p->next == 0 && constructor_decl != 0
5645 && constructor_incremental)
5647 constructor = digest_init (constructor_type, constructor,
5648 require_constant_value,
5649 require_constant_elements);
5651 /* If initializing an array of unknown size,
5652 determine the size now. */
5653 if (TREE_CODE (constructor_type) == ARRAY_TYPE
5654 && TYPE_DOMAIN (constructor_type) == 0)
5659 push_obstacks_nochange ();
5660 if (TREE_PERMANENT (constructor_type))
5661 end_temporary_allocation ();
5663 momentary_p = suspend_momentary ();
5665 /* We shouldn't have an incomplete array type within
5667 if (constructor_stack->next)
5671 = complete_array_type (constructor_type,
5676 size = int_size_in_bytes (constructor_type);
5677 resume_momentary (momentary_p);
5681 output_constant (constructor, size);
5684 else if (constructor_type == 0)
5686 else if (TREE_CODE (constructor_type) != RECORD_TYPE
5687 && TREE_CODE (constructor_type) != UNION_TYPE
5688 && TREE_CODE (constructor_type) != ARRAY_TYPE
5689 && ! constructor_incremental)
5691 /* A nonincremental scalar initializer--just return
5692 the element, after verifying there is just one. */
5693 if (constructor_elements == 0)
5695 error_init ("empty scalar initializer%s",
5697 constructor = error_mark_node;
5699 else if (TREE_CHAIN (constructor_elements) != 0)
5701 error_init ("extra elements in scalar initializer%s",
5703 constructor = TREE_VALUE (constructor_elements);
5706 constructor = TREE_VALUE (constructor_elements);
5708 else if (! constructor_incremental)
5710 if (constructor_erroneous)
5711 constructor = error_mark_node;
5714 int momentary = suspend_momentary ();
5716 constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE,
5717 nreverse (constructor_elements));
5718 if (constructor_constant)
5719 TREE_CONSTANT (constructor) = 1;
5720 if (constructor_constant && constructor_simple)
5721 TREE_STATIC (constructor) = 1;
5723 resume_momentary (momentary);
5729 int momentary = suspend_momentary ();
5731 if (TREE_CODE (constructor_type) == RECORD_TYPE
5732 || TREE_CODE (constructor_type) == UNION_TYPE)
5734 /* Find the offset of the end of that field. */
5735 filled = size_binop (CEIL_DIV_EXPR,
5736 constructor_bit_index,
5737 size_int (BITS_PER_UNIT));
5739 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5741 /* If initializing an array of unknown size,
5742 determine the size now. */
5743 if (TREE_CODE (constructor_type) == ARRAY_TYPE
5744 && TYPE_DOMAIN (constructor_type) == 0)
5747 = size_binop (MINUS_EXPR,
5748 constructor_unfilled_index,
5751 push_obstacks_nochange ();
5752 if (TREE_PERMANENT (constructor_type))
5753 end_temporary_allocation ();
5754 maxindex = copy_node (maxindex);
5755 TYPE_DOMAIN (constructor_type) = build_index_type (maxindex);
5756 TREE_TYPE (maxindex) = TYPE_DOMAIN (constructor_type);
5758 /* TYPE_MAX_VALUE is always one less than the number of elements
5759 in the array, because we start counting at zero. Therefore,
5760 warn only if the value is less than zero. */
5762 && (tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)))
5764 error_with_decl (constructor_decl,
5765 "zero or negative array size `%s'");
5766 layout_type (constructor_type);
5767 size = int_size_in_bytes (constructor_type);
5771 filled = size_binop (MULT_EXPR, constructor_unfilled_index,
5772 size_in_bytes (TREE_TYPE (constructor_type)));
5778 assemble_zeros (size - TREE_INT_CST_LOW (filled));
5780 resume_momentary (momentary);
5784 constructor_type = p->type;
5785 constructor_fields = p->fields;
5786 constructor_index = p->index;
5787 constructor_range_end = p->range_end;
5788 constructor_max_index = p->max_index;
5789 constructor_unfilled_index = p->unfilled_index;
5790 constructor_unfilled_fields = p->unfilled_fields;
5791 constructor_bit_index = p->bit_index;
5792 constructor_elements = p->elements;
5793 constructor_constant = p->constant;
5794 constructor_simple = p->simple;
5795 constructor_erroneous = p->erroneous;
5796 constructor_pending_elts = p->pending_elts;
5797 constructor_depth = p->depth;
5798 constructor_incremental = p->incremental;
5799 RESTORE_SPELLING_DEPTH (constructor_depth);
5801 constructor_stack = p->next;
5804 if (constructor == 0)
5806 if (constructor_stack == 0)
5807 return error_mark_node;
5813 /* Within an array initializer, specify the next index to be initialized.
5814 FIRST is that index. If LAST is nonzero, then initialize a range
5815 of indices, running from FIRST through LAST. */
5818 set_init_index (first, last)
5821 while ((TREE_CODE (first) == NOP_EXPR
5822 || TREE_CODE (first) == CONVERT_EXPR
5823 || TREE_CODE (first) == NON_LVALUE_EXPR)
5824 && (TYPE_MODE (TREE_TYPE (first))
5825 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0)))))
5826 (first) = TREE_OPERAND (first, 0);
5828 while ((TREE_CODE (last) == NOP_EXPR
5829 || TREE_CODE (last) == CONVERT_EXPR
5830 || TREE_CODE (last) == NON_LVALUE_EXPR)
5831 && (TYPE_MODE (TREE_TYPE (last))
5832 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0)))))
5833 (last) = TREE_OPERAND (last, 0);
5835 if (TREE_CODE (first) != INTEGER_CST)
5836 error_init ("nonconstant array index in initializer%s", " for `%s'", NULL);
5837 else if (last != 0 && TREE_CODE (last) != INTEGER_CST)
5838 error_init ("nonconstant array index in initializer%s", " for `%s'", NULL);
5839 else if (! constructor_unfilled_index)
5840 error_init ("array index in non-array initializer%s", " for `%s'", NULL);
5841 else if (tree_int_cst_lt (first, constructor_unfilled_index))
5842 error_init ("duplicate array index in initializer%s", " for `%s'", NULL);
5845 TREE_INT_CST_LOW (constructor_index) = TREE_INT_CST_LOW (first);
5846 TREE_INT_CST_HIGH (constructor_index) = TREE_INT_CST_HIGH (first);
5848 if (last != 0 && tree_int_cst_lt (last, first))
5849 error_init ("empty index range in initializer%s", " for `%s'", NULL);
5853 pedwarn ("ANSI C forbids specifying element to initialize");
5854 constructor_range_end = last;
5859 /* Within a struct initializer, specify the next field to be initialized. */
5862 set_init_label (fieldname)
5868 /* Don't die if an entire brace-pair level is superfluous
5869 in the containing level. */
5870 if (constructor_type == 0)
5873 for (tail = TYPE_FIELDS (constructor_type); tail;
5874 tail = TREE_CHAIN (tail))
5876 if (tail == constructor_unfilled_fields)
5878 if (DECL_NAME (tail) == fieldname)
5883 error ("unknown field `%s' specified in initializer",
5884 IDENTIFIER_POINTER (fieldname));
5886 error ("field `%s' already initialized",
5887 IDENTIFIER_POINTER (fieldname));
5890 constructor_fields = tail;
5892 pedwarn ("ANSI C forbids specifying structure member to initialize");
5896 /* Add a new initializer to the tree of pending initializers. PURPOSE
5897 indentifies the initializer, either array index or field in a structure.
5898 VALUE is the value of that index or field. */
5901 add_pending_init (purpose, value)
5902 tree purpose, value;
5904 struct init_node *p, **q, *r;
5906 q = &constructor_pending_elts;
5909 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
5914 if (tree_int_cst_lt (purpose, p->purpose))
5916 else if (tree_int_cst_lt (p->purpose, purpose))
5927 if (tree_int_cst_lt (DECL_FIELD_BITPOS (purpose),
5928 DECL_FIELD_BITPOS (p->purpose)))
5930 else if (tree_int_cst_lt (DECL_FIELD_BITPOS (p->purpose),
5931 DECL_FIELD_BITPOS (purpose)))
5938 r = (struct init_node *) oballoc (sizeof (struct init_node));
5939 r->purpose = purpose;
5950 struct init_node *s;
5954 if (p->balance == 0)
5956 else if (p->balance < 0)
5963 p->left->parent = p;
5980 constructor_pending_elts = r;
5985 struct init_node *t = r->right;
5989 r->right->parent = r;
5994 p->left->parent = p;
5997 p->balance = t->balance < 0;
5998 r->balance = -(t->balance > 0);
6013 constructor_pending_elts = t;
6019 /* p->balance == +1; growth of left side balances the node. */
6024 else /* r == p->right */
6026 if (p->balance == 0)
6027 /* Growth propagation from right side. */
6029 else if (p->balance > 0)
6036 p->right->parent = p;
6053 constructor_pending_elts = r;
6055 else /* r->balance == -1 */
6058 struct init_node *t = r->left;
6062 r->left->parent = r;
6067 p->right->parent = p;
6070 r->balance = (t->balance < 0);
6071 p->balance = -(t->balance > 0);
6086 constructor_pending_elts = t;
6092 /* p->balance == -1; growth of right side balances the node. */
6103 /* Return nonzero if FIELD is equal to the index of a pending initializer. */
6106 pending_init_member (field)
6109 struct init_node *p;
6111 p = constructor_pending_elts;
6112 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6116 if (tree_int_cst_equal (field, p->purpose))
6118 else if (tree_int_cst_lt (field, p->purpose))
6128 if (field == p->purpose)
6130 else if (tree_int_cst_lt (DECL_FIELD_BITPOS (field),
6131 DECL_FIELD_BITPOS (p->purpose)))
6141 /* "Output" the next constructor element.
6142 At top level, really output it to assembler code now.
6143 Otherwise, collect it in a list from which we will make a CONSTRUCTOR.
6144 TYPE is the data type that the containing data type wants here.
6145 FIELD is the field (a FIELD_DECL) or the index that this element fills.
6147 PENDING if non-nil means output pending elements that belong
6148 right after this element. (PENDING is normally 1;
6149 it is 0 while outputting pending elements, to avoid recursion.) */
6152 output_init_element (value, type, field, pending)
6153 tree value, type, field;
6158 if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE
6159 || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE
6160 && !(TREE_CODE (value) == STRING_CST
6161 && TREE_CODE (type) == ARRAY_TYPE
6162 && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE)
6163 && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)),
6164 TYPE_MAIN_VARIANT (type))))
6165 value = default_conversion (value);
6167 if (value == error_mark_node)
6168 constructor_erroneous = 1;
6169 else if (!TREE_CONSTANT (value))
6170 constructor_constant = 0;
6171 else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0
6172 || ((TREE_CODE (constructor_type) == RECORD_TYPE
6173 || TREE_CODE (constructor_type) == UNION_TYPE)
6174 && DECL_C_BIT_FIELD (field)
6175 && TREE_CODE (value) != INTEGER_CST))
6176 constructor_simple = 0;
6178 if (require_constant_value && ! TREE_CONSTANT (value))
6180 error_init ("initializer element%s is not constant",
6182 value = error_mark_node;
6184 else if (require_constant_elements
6185 && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0)
6187 error_init ("initializer element%s is not computable at load time",
6189 value = error_mark_node;
6192 /* If this element duplicates one on constructor_pending_elts,
6193 print a message and ignore it. Don't do this when we're
6194 processing elements taken off constructor_pending_elts,
6195 because we'd always get spurious errors. */
6198 if (TREE_CODE (constructor_type) == RECORD_TYPE
6199 || TREE_CODE (constructor_type) == UNION_TYPE
6200 || TREE_CODE (constructor_type) == ARRAY_TYPE)
6202 if (pending_init_member (field))
6204 error_init ("duplicate initializer%s", " for `%s'", NULL);
6210 /* If this element doesn't come next in sequence,
6211 put it on constructor_pending_elts. */
6212 if (TREE_CODE (constructor_type) == ARRAY_TYPE
6213 && !tree_int_cst_equal (field, constructor_unfilled_index))
6216 /* The copy_node is needed in case field is actually
6217 constructor_index, which is modified in place. */
6218 add_pending_init (copy_node (field),
6219 digest_init (type, value, require_constant_value,
6220 require_constant_elements));
6222 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6223 && field != constructor_unfilled_fields)
6225 /* We do this for records but not for unions. In a union,
6226 no matter which field is specified, it can be initialized
6227 right away since it starts at the beginning of the union. */
6229 add_pending_init (field,
6230 digest_init (type, value, require_constant_value,
6231 require_constant_elements));
6235 /* Otherwise, output this element either to
6236 constructor_elements or to the assembler file. */
6240 if (! constructor_incremental)
6242 if (field && TREE_CODE (field) == INTEGER_CST)
6243 field = copy_node (field);
6244 constructor_elements
6245 = tree_cons (field, digest_init (type, value,
6246 require_constant_value,
6247 require_constant_elements),
6248 constructor_elements);
6252 /* Structure elements may require alignment.
6253 Do this, if necessary. */
6254 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6256 /* Advance to offset of this element. */
6257 if (! tree_int_cst_equal (constructor_bit_index,
6258 DECL_FIELD_BITPOS (field)))
6260 /* By using unsigned arithmetic, the result will be
6261 correct even in case of overflows, if BITS_PER_UNIT
6262 is a power of two. */
6263 unsigned next = (TREE_INT_CST_LOW
6264 (DECL_FIELD_BITPOS (field))
6265 / (unsigned)BITS_PER_UNIT);
6266 unsigned here = (TREE_INT_CST_LOW
6267 (constructor_bit_index)
6268 / (unsigned)BITS_PER_UNIT);
6270 assemble_zeros ((next - here)
6271 * (unsigned)BITS_PER_UNIT
6272 / (unsigned)BITS_PER_UNIT);
6275 output_constant (digest_init (type, value,
6276 require_constant_value,
6277 require_constant_elements),
6278 int_size_in_bytes (type));
6280 /* For a record or union,
6281 keep track of end position of last field. */
6282 if (TREE_CODE (constructor_type) == RECORD_TYPE
6283 || TREE_CODE (constructor_type) == UNION_TYPE)
6285 tree temp = size_binop (PLUS_EXPR, DECL_FIELD_BITPOS (field),
6287 TREE_INT_CST_LOW (constructor_bit_index)
6288 = TREE_INT_CST_LOW (temp);
6289 TREE_INT_CST_HIGH (constructor_bit_index)
6290 = TREE_INT_CST_HIGH (temp);
6295 /* Advance the variable that indicates sequential elements output. */
6296 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6298 tree tem = size_binop (PLUS_EXPR, constructor_unfilled_index,
6300 TREE_INT_CST_LOW (constructor_unfilled_index)
6301 = TREE_INT_CST_LOW (tem);
6302 TREE_INT_CST_HIGH (constructor_unfilled_index)
6303 = TREE_INT_CST_HIGH (tem);
6305 else if (TREE_CODE (constructor_type) == RECORD_TYPE)
6306 constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields);
6307 else if (TREE_CODE (constructor_type) == UNION_TYPE)
6308 constructor_unfilled_fields = 0;
6310 /* Now output any pending elements which have become next. */
6312 output_pending_init_elements (0);
6316 /* Output any pending elements which have become next.
6317 As we output elements, constructor_unfilled_{fields,index}
6318 advances, which may cause other elements to become next;
6319 if so, they too are output.
6321 If ALL is 0, we return when there are
6322 no more pending elements to output now.
6324 If ALL is 1, we output space as necessary so that
6325 we can output all the pending elements. */
6328 output_pending_init_elements (all)
6331 struct init_node *elt = constructor_pending_elts;
6336 /* Look thru the whole pending tree.
6337 If we find an element that should be output now,
6338 output it. Otherwise, set NEXT to the element
6339 that comes first among those still pending. */
6344 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6346 if (tree_int_cst_equal (elt->purpose,
6347 constructor_unfilled_index))
6348 output_init_element (elt->value,
6349 TREE_TYPE (constructor_type),
6350 constructor_unfilled_index, 0);
6351 else if (tree_int_cst_lt (constructor_unfilled_index,
6354 /* Advance to the next smaller node. */
6359 /* We have reached the smallest node bigger than the
6360 current unfilled index. Fill the space first. */
6361 next = elt->purpose;
6367 /* Advance to the next bigger node. */
6372 /* We have reached the biggest node in a subtree. Find
6373 the parent of it, which is the next bigger node. */
6374 while (elt->parent && elt->parent->right == elt)
6377 if (elt && tree_int_cst_lt (constructor_unfilled_index,
6380 next = elt->purpose;
6386 else if (TREE_CODE (constructor_type) == RECORD_TYPE
6387 || TREE_CODE (constructor_type) == UNION_TYPE)
6389 /* If the current record is complete we are done. */
6390 if (constructor_unfilled_fields == 0)
6392 if (elt->purpose == constructor_unfilled_fields)
6394 output_init_element (elt->value,
6395 TREE_TYPE (constructor_unfilled_fields),
6396 constructor_unfilled_fields,
6399 else if (tree_int_cst_lt (DECL_FIELD_BITPOS (constructor_unfilled_fields),
6400 DECL_FIELD_BITPOS (elt->purpose)))
6402 /* Advance to the next smaller node. */
6407 /* We have reached the smallest node bigger than the
6408 current unfilled field. Fill the space first. */
6409 next = elt->purpose;
6415 /* Advance to the next bigger node. */
6420 /* We have reached the biggest node in a subtree. Find
6421 the parent of it, which is the next bigger node. */
6422 while (elt->parent && elt->parent->right == elt)
6426 && tree_int_cst_lt (DECL_FIELD_BITPOS (constructor_unfilled_fields),
6427 DECL_FIELD_BITPOS (elt->purpose)))
6429 next = elt->purpose;
6437 /* Ordinarily return, but not if we want to output all
6438 and there are elements left. */
6439 if (! (all && next != 0))
6442 /* Generate space up to the position of NEXT. */
6443 if (constructor_incremental)
6446 tree nextpos_tree = size_int (0);
6448 if (TREE_CODE (constructor_type) == RECORD_TYPE
6449 || TREE_CODE (constructor_type) == UNION_TYPE)
6452 /* Find the last field written out, if any. */
6453 for (tail = TYPE_FIELDS (constructor_type); tail;
6454 tail = TREE_CHAIN (tail))
6455 if (TREE_CHAIN (tail) == constructor_unfilled_fields)
6459 /* Find the offset of the end of that field. */
6460 filled = size_binop (CEIL_DIV_EXPR,
6461 size_binop (PLUS_EXPR,
6462 DECL_FIELD_BITPOS (tail),
6464 size_int (BITS_PER_UNIT));
6466 filled = size_int (0);
6468 nextpos_tree = size_binop (CEIL_DIV_EXPR,
6469 DECL_FIELD_BITPOS (next),
6470 size_int (BITS_PER_UNIT));
6472 TREE_INT_CST_HIGH (constructor_bit_index)
6473 = TREE_INT_CST_HIGH (DECL_FIELD_BITPOS (next));
6474 TREE_INT_CST_LOW (constructor_bit_index)
6475 = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (next));
6476 constructor_unfilled_fields = next;
6478 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6480 filled = size_binop (MULT_EXPR, constructor_unfilled_index,
6481 size_in_bytes (TREE_TYPE (constructor_type)));
6483 = size_binop (MULT_EXPR, next,
6484 size_in_bytes (TREE_TYPE (constructor_type)));
6485 TREE_INT_CST_LOW (constructor_unfilled_index)
6486 = TREE_INT_CST_LOW (next);
6487 TREE_INT_CST_HIGH (constructor_unfilled_index)
6488 = TREE_INT_CST_HIGH (next);
6495 int nextpos = TREE_INT_CST_LOW (nextpos_tree);
6497 assemble_zeros (nextpos - TREE_INT_CST_LOW (filled));
6502 /* If it's not incremental, just skip over the gap,
6503 so that after jumping to retry we will output the next
6504 successive element. */
6505 if (TREE_CODE (constructor_type) == RECORD_TYPE
6506 || TREE_CODE (constructor_type) == UNION_TYPE)
6507 constructor_unfilled_fields = next;
6508 else if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6510 TREE_INT_CST_LOW (constructor_unfilled_index)
6511 = TREE_INT_CST_LOW (next);
6512 TREE_INT_CST_HIGH (constructor_unfilled_index)
6513 = TREE_INT_CST_HIGH (next);
6517 /* ELT now points to the node in the pending tree with the next
6518 initializer to output. */
6522 /* Add one non-braced element to the current constructor level.
6523 This adjusts the current position within the constructor's type.
6524 This may also start or terminate implicit levels
6525 to handle a partly-braced initializer.
6527 Once this has found the correct level for the new element,
6528 it calls output_init_element.
6530 Note: if we are incrementally outputting this constructor,
6531 this function may be called with a null argument
6532 representing a sub-constructor that was already incrementally output.
6533 When that happens, we output nothing, but we do the bookkeeping
6534 to skip past that element of the current constructor. */
6537 process_init_element (value)
6540 tree orig_value = value;
6541 int string_flag = value != 0 && TREE_CODE (value) == STRING_CST;
6543 /* Handle superfluous braces around string cst as in
6544 char x[] = {"foo"}; */
6547 && TREE_CODE (constructor_type) == ARRAY_TYPE
6548 && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE
6549 && integer_zerop (constructor_unfilled_index))
6551 constructor_stack->replacement_value = value;
6555 if (constructor_stack->replacement_value != 0)
6557 error_init ("excess elements in struct initializer%s",
6558 " after `%s'", NULL_PTR);
6562 /* Ignore elements of a brace group if it is entirely superfluous
6563 and has already been diagnosed. */
6564 if (constructor_type == 0)
6567 /* If we've exhausted any levels that didn't have braces,
6569 while (constructor_stack->implicit)
6571 if ((TREE_CODE (constructor_type) == RECORD_TYPE
6572 || TREE_CODE (constructor_type) == UNION_TYPE)
6573 && constructor_fields == 0)
6574 process_init_element (pop_init_level (1));
6575 else if (TREE_CODE (constructor_type) == ARRAY_TYPE
6576 && (constructor_max_index == 0
6577 || tree_int_cst_lt (constructor_max_index,
6578 constructor_index)))
6579 process_init_element (pop_init_level (1));
6586 if (TREE_CODE (constructor_type) == RECORD_TYPE)
6589 enum tree_code fieldcode;
6591 if (constructor_fields == 0)
6593 pedwarn_init ("excess elements in struct initializer%s",
6594 " after `%s'", NULL_PTR);
6598 fieldtype = TREE_TYPE (constructor_fields);
6599 if (fieldtype != error_mark_node)
6600 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6601 fieldcode = TREE_CODE (fieldtype);
6603 /* Accept a string constant to initialize a subarray. */
6605 && fieldcode == ARRAY_TYPE
6606 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6609 /* Otherwise, if we have come to a subaggregate,
6610 and we don't have an element of its type, push into it. */
6611 else if (value != 0 && !constructor_no_implicit
6612 && value != error_mark_node
6613 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6614 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6615 || fieldcode == UNION_TYPE))
6617 push_init_level (1);
6623 push_member_name (constructor_fields);
6624 output_init_element (value, fieldtype, constructor_fields, 1);
6625 RESTORE_SPELLING_DEPTH (constructor_depth);
6628 /* Do the bookkeeping for an element that was
6629 directly output as a constructor. */
6631 /* For a record, keep track of end position of last field. */
6632 tree temp = size_binop (PLUS_EXPR,
6633 DECL_FIELD_BITPOS (constructor_fields),
6634 DECL_SIZE (constructor_fields));
6635 TREE_INT_CST_LOW (constructor_bit_index)
6636 = TREE_INT_CST_LOW (temp);
6637 TREE_INT_CST_HIGH (constructor_bit_index)
6638 = TREE_INT_CST_HIGH (temp);
6640 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6643 constructor_fields = TREE_CHAIN (constructor_fields);
6644 /* Skip any nameless bit fields at the beginning. */
6645 while (constructor_fields != 0
6646 && DECL_C_BIT_FIELD (constructor_fields)
6647 && DECL_NAME (constructor_fields) == 0)
6648 constructor_fields = TREE_CHAIN (constructor_fields);
6651 if (TREE_CODE (constructor_type) == UNION_TYPE)
6654 enum tree_code fieldcode;
6656 if (constructor_fields == 0)
6658 pedwarn_init ("excess elements in union initializer%s",
6659 " after `%s'", NULL_PTR);
6663 fieldtype = TREE_TYPE (constructor_fields);
6664 if (fieldtype != error_mark_node)
6665 fieldtype = TYPE_MAIN_VARIANT (fieldtype);
6666 fieldcode = TREE_CODE (fieldtype);
6668 /* Accept a string constant to initialize a subarray. */
6670 && fieldcode == ARRAY_TYPE
6671 && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE
6674 /* Otherwise, if we have come to a subaggregate,
6675 and we don't have an element of its type, push into it. */
6676 else if (value != 0 && !constructor_no_implicit
6677 && value != error_mark_node
6678 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype
6679 && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE
6680 || fieldcode == UNION_TYPE))
6682 push_init_level (1);
6688 push_member_name (constructor_fields);
6689 output_init_element (value, fieldtype, constructor_fields, 1);
6690 RESTORE_SPELLING_DEPTH (constructor_depth);
6693 /* Do the bookkeeping for an element that was
6694 directly output as a constructor. */
6696 TREE_INT_CST_LOW (constructor_bit_index)
6697 = TREE_INT_CST_LOW (DECL_SIZE (constructor_fields));
6698 TREE_INT_CST_HIGH (constructor_bit_index)
6699 = TREE_INT_CST_HIGH (DECL_SIZE (constructor_fields));
6701 constructor_unfilled_fields = TREE_CHAIN (constructor_fields);
6704 constructor_fields = 0;
6707 if (TREE_CODE (constructor_type) == ARRAY_TYPE)
6709 tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type));
6710 enum tree_code eltcode = TREE_CODE (elttype);
6712 /* Accept a string constant to initialize a subarray. */
6714 && eltcode == ARRAY_TYPE
6715 && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE
6718 /* Otherwise, if we have come to a subaggregate,
6719 and we don't have an element of its type, push into it. */
6720 else if (value != 0 && !constructor_no_implicit
6721 && value != error_mark_node
6722 && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype
6723 && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE
6724 || eltcode == UNION_TYPE))
6726 push_init_level (1);
6730 if (constructor_max_index != 0
6731 && tree_int_cst_lt (constructor_max_index, constructor_index))
6733 pedwarn_init ("excess elements in array initializer%s",
6734 " after `%s'", NULL_PTR);
6738 /* In the case of [LO .. HI] = VALUE, only evaluate VALUE once. */
6739 if (constructor_range_end)
6741 if (constructor_max_index != 0
6742 && tree_int_cst_lt (constructor_max_index,
6743 constructor_range_end))
6745 pedwarn_init ("excess elements in array initializer%s",
6746 " after `%s'", NULL_PTR);
6747 TREE_INT_CST_HIGH (constructor_range_end)
6748 = TREE_INT_CST_HIGH (constructor_max_index);
6749 TREE_INT_CST_LOW (constructor_range_end)
6750 = TREE_INT_CST_LOW (constructor_max_index);
6753 value = save_expr (value);
6756 /* Now output the actual element.
6757 Ordinarily, output once.
6758 If there is a range, repeat it till we advance past the range. */
6765 push_array_bounds (TREE_INT_CST_LOW (constructor_index));
6766 output_init_element (value, elttype, constructor_index, 1);
6767 RESTORE_SPELLING_DEPTH (constructor_depth);
6770 tem = size_binop (PLUS_EXPR, constructor_index,
6772 TREE_INT_CST_LOW (constructor_index) = TREE_INT_CST_LOW (tem);
6773 TREE_INT_CST_HIGH (constructor_index) = TREE_INT_CST_HIGH (tem);
6776 /* If we are doing the bookkeeping for an element that was
6777 directly output as a constructor,
6778 we must update constructor_unfilled_index. */
6780 TREE_INT_CST_LOW (constructor_unfilled_index)
6781 = TREE_INT_CST_LOW (constructor_index);
6782 TREE_INT_CST_HIGH (constructor_unfilled_index)
6783 = TREE_INT_CST_HIGH (constructor_index);
6786 while (! (constructor_range_end == 0
6787 || tree_int_cst_lt (constructor_range_end,
6788 constructor_index)));
6793 /* Handle the sole element allowed in a braced initializer
6794 for a scalar variable. */
6795 if (constructor_fields == 0)
6797 pedwarn_init ("excess elements in scalar initializer%s",
6798 " after `%s'", NULL_PTR);
6803 output_init_element (value, constructor_type, NULL_TREE, 1);
6804 constructor_fields = 0;
6808 /* If the (lexically) previous elments are not now saved,
6809 we can discard the storage for them. */
6810 if (constructor_incremental && constructor_pending_elts == 0 && value != 0
6811 && constructor_stack == 0)
6815 /* Expand an ASM statement with operands, handling output operands
6816 that are not variables or INDIRECT_REFS by transforming such
6817 cases into cases that expand_asm_operands can handle.
6819 Arguments are same as for expand_asm_operands. */
6822 c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line)
6823 tree string, outputs, inputs, clobbers;
6828 int noutputs = list_length (outputs);
6830 /* o[I] is the place that output number I should be written. */
6831 register tree *o = (tree *) alloca (noutputs * sizeof (tree));
6834 if (TREE_CODE (string) == ADDR_EXPR)
6835 string = TREE_OPERAND (string, 0);
6836 if (TREE_CODE (string) != STRING_CST)
6838 error ("asm template is not a string constant");
6842 /* Record the contents of OUTPUTS before it is modified. */
6843 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6844 o[i] = TREE_VALUE (tail);
6846 /* Perform default conversions on array and function inputs. */
6847 /* Don't do this for other types--
6848 it would screw up operands expected to be in memory. */
6849 for (i = 0, tail = inputs; tail; tail = TREE_CHAIN (tail), i++)
6850 if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE
6851 || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE)
6852 TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail));
6854 /* Generate the ASM_OPERANDS insn;
6855 store into the TREE_VALUEs of OUTPUTS some trees for
6856 where the values were actually stored. */
6857 expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line);
6859 /* Copy all the intermediate outputs into the specified outputs. */
6860 for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++)
6862 if (o[i] != TREE_VALUE (tail))
6864 expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)),
6868 /* Detect modification of read-only values.
6869 (Otherwise done by build_modify_expr.) */
6872 tree type = TREE_TYPE (o[i]);
6873 if (TREE_READONLY (o[i])
6874 || TYPE_READONLY (type)
6875 || ((TREE_CODE (type) == RECORD_TYPE
6876 || TREE_CODE (type) == UNION_TYPE)
6877 && C_TYPE_FIELDS_READONLY (type)))
6878 readonly_warning (o[i], "modification by `asm'");
6882 /* Those MODIFY_EXPRs could do autoincrements. */
6886 /* Expand a C `return' statement.
6887 RETVAL is the expression for what to return,
6888 or a null pointer for `return;' with no value. */
6891 c_expand_return (retval)
6894 tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl));
6896 if (TREE_THIS_VOLATILE (current_function_decl))
6897 warning ("function declared `noreturn' has a `return' statement");
6901 current_function_returns_null = 1;
6902 if (warn_return_type && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE)
6903 warning ("`return' with no value, in function returning non-void");
6904 expand_null_return ();
6906 else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE)
6908 current_function_returns_null = 1;
6909 if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE)
6910 pedwarn ("`return' with a value, in function returning void");
6911 expand_return (retval);
6915 tree t = convert_for_assignment (valtype, retval, "return",
6916 NULL_TREE, NULL_TREE, 0);
6917 tree res = DECL_RESULT (current_function_decl);
6920 if (t == error_mark_node)
6923 inner = t = convert (TREE_TYPE (res), t);
6925 /* Strip any conversions, additions, and subtractions, and see if
6926 we are returning the address of a local variable. Warn if so. */
6929 switch (TREE_CODE (inner))
6931 case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR:
6933 inner = TREE_OPERAND (inner, 0);
6937 /* If the second operand of the MINUS_EXPR has a pointer
6938 type (or is converted from it), this may be valid, so
6939 don't give a warning. */
6941 tree op1 = TREE_OPERAND (inner, 1);
6943 while (! POINTER_TYPE_P (TREE_TYPE (op1))
6944 && (TREE_CODE (op1) == NOP_EXPR
6945 || TREE_CODE (op1) == NON_LVALUE_EXPR
6946 || TREE_CODE (op1) == CONVERT_EXPR))
6947 op1 = TREE_OPERAND (op1, 0);
6949 if (POINTER_TYPE_P (TREE_TYPE (op1)))
6952 inner = TREE_OPERAND (inner, 0);
6957 inner = TREE_OPERAND (inner, 0);
6959 while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r')
6960 inner = TREE_OPERAND (inner, 0);
6962 if (TREE_CODE (inner) == VAR_DECL
6963 && ! DECL_EXTERNAL (inner)
6964 && ! TREE_STATIC (inner)
6965 && DECL_CONTEXT (inner) == current_function_decl)
6966 warning ("function returns address of local variable");
6976 t = build (MODIFY_EXPR, TREE_TYPE (res), res, t);
6977 TREE_SIDE_EFFECTS (t) = 1;
6979 current_function_returns_value = 1;
6983 /* Start a C switch statement, testing expression EXP.
6984 Return EXP if it is valid, an error node otherwise. */
6987 c_expand_start_case (exp)
6990 register enum tree_code code = TREE_CODE (TREE_TYPE (exp));
6991 tree type = TREE_TYPE (exp);
6993 if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK)
6995 error ("switch quantity not an integer");
6996 exp = error_mark_node;
7001 type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
7003 if (warn_traditional
7004 && (type == long_integer_type_node
7005 || type == long_unsigned_type_node))
7006 pedwarn ("`long' switch expression not converted to `int' in ANSI C");
7008 exp = default_conversion (exp);
7009 type = TREE_TYPE (exp);
7010 index = get_unwidened (exp, NULL_TREE);
7011 /* We can't strip a conversion from a signed type to an unsigned,
7012 because if we did, int_fits_type_p would do the wrong thing
7013 when checking case values for being in range,
7014 and it's too hard to do the right thing. */
7015 if (TREE_UNSIGNED (TREE_TYPE (exp))
7016 == TREE_UNSIGNED (TREE_TYPE (index)))
7020 expand_start_case (1, exp, type, "switch statement");