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400fbf9f | 1 | /* Build expressions with type checking for C compiler. |
0953878d | 2 | Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
1033ffa8 | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
068e6bb3 | 4 | Free Software Foundation, Inc. |
400fbf9f | 5 | |
1322177d | 6 | This file is part of GCC. |
400fbf9f | 7 | |
1322177d LB |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 11 | version. |
400fbf9f | 12 | |
1322177d LB |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
400fbf9f JW |
17 | |
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
400fbf9f JW |
21 | |
22 | ||
23 | /* This file is part of the C front end. | |
24 | It contains routines to build C expressions given their operands, | |
25 | including computing the types of the result, C-specific error checks, | |
5088b058 | 26 | and some optimization. */ |
400fbf9f JW |
27 | |
28 | #include "config.h" | |
670ee920 | 29 | #include "system.h" |
4977bab6 ZW |
30 | #include "coretypes.h" |
31 | #include "tm.h" | |
742b62e7 | 32 | #include "rtl.h" |
400fbf9f | 33 | #include "tree.h" |
e57e265b | 34 | #include "langhooks.h" |
400fbf9f | 35 | #include "c-tree.h" |
6baf1cc8 | 36 | #include "tm_p.h" |
400fbf9f | 37 | #include "flags.h" |
e14417fa | 38 | #include "output.h" |
234042f4 | 39 | #include "expr.h" |
5f6da302 | 40 | #include "toplev.h" |
ab87f8c8 | 41 | #include "intl.h" |
4dd7201e | 42 | #include "ggc.h" |
672a6f42 | 43 | #include "target.h" |
325c3691 | 44 | #include "tree-iterator.h" |
3a5b9284 | 45 | #include "tree-gimple.h" |
089efaa4 | 46 | #include "tree-flow.h" |
325c3691 | 47 | |
2ac2f164 JM |
48 | /* Possible cases of implicit bad conversions. Used to select |
49 | diagnostic messages in convert_for_assignment. */ | |
50 | enum impl_conv { | |
51 | ic_argpass, | |
6dcc04b0 | 52 | ic_argpass_nonproto, |
2ac2f164 JM |
53 | ic_assign, |
54 | ic_init, | |
55 | ic_return | |
56 | }; | |
57 | ||
bc4b653b JM |
58 | /* The level of nesting inside "__alignof__". */ |
59 | int in_alignof; | |
60 | ||
61 | /* The level of nesting inside "sizeof". */ | |
62 | int in_sizeof; | |
63 | ||
64 | /* The level of nesting inside "typeof". */ | |
65 | int in_typeof; | |
400fbf9f | 66 | |
187230a7 JM |
67 | struct c_label_context_se *label_context_stack_se; |
68 | struct c_label_context_vm *label_context_stack_vm; | |
16ef3acc | 69 | |
b71c7f8a | 70 | /* Nonzero if we've already printed a "missing braces around initializer" |
103b7b17 | 71 | message within this initializer. */ |
b71c7f8a | 72 | static int missing_braces_mentioned; |
103b7b17 | 73 | |
bf730f15 RS |
74 | static int require_constant_value; |
75 | static int require_constant_elements; | |
76 | ||
58f9752a | 77 | static bool null_pointer_constant_p (const_tree); |
f55ade6e | 78 | static tree qualify_type (tree, tree); |
58f9752a | 79 | static int tagged_types_tu_compatible_p (const_tree, const_tree); |
58393038 | 80 | static int comp_target_types (tree, tree); |
58f9752a KG |
81 | static int function_types_compatible_p (const_tree, const_tree); |
82 | static int type_lists_compatible_p (const_tree, const_tree); | |
f55ade6e | 83 | static tree decl_constant_value_for_broken_optimization (tree); |
f55ade6e | 84 | static tree lookup_field (tree, tree); |
94a0dd7b | 85 | static int convert_arguments (int, tree *, tree, tree, tree, tree); |
f55ade6e | 86 | static tree pointer_diff (tree, tree); |
2ac2f164 | 87 | static tree convert_for_assignment (tree, tree, enum impl_conv, tree, tree, |
f55ade6e | 88 | int); |
f55ade6e AJ |
89 | static tree valid_compound_expr_initializer (tree, tree); |
90 | static void push_string (const char *); | |
91 | static void push_member_name (tree); | |
f55ade6e AJ |
92 | static int spelling_length (void); |
93 | static char *print_spelling (char *); | |
683d6ff9 | 94 | static void warning_init (int, const char *); |
916c5919 JM |
95 | static tree digest_init (tree, tree, bool, int); |
96 | static void output_init_element (tree, bool, tree, tree, int); | |
f55ade6e AJ |
97 | static void output_pending_init_elements (int); |
98 | static int set_designator (int); | |
99 | static void push_range_stack (tree); | |
100 | static void add_pending_init (tree, tree); | |
101 | static void set_nonincremental_init (void); | |
102 | static void set_nonincremental_init_from_string (tree); | |
103 | static tree find_init_member (tree); | |
9bf24266 | 104 | static void readonly_error (tree, enum lvalue_use); |
58f9752a KG |
105 | static int lvalue_or_else (const_tree, enum lvalue_use); |
106 | static int lvalue_p (const_tree); | |
4e2fb7de | 107 | static void record_maybe_used_decl (tree); |
58f9752a | 108 | static int comptypes_internal (const_tree, const_tree); |
6aa3c60d JM |
109 | \f |
110 | /* Return true if EXP is a null pointer constant, false otherwise. */ | |
111 | ||
112 | static bool | |
58f9752a | 113 | null_pointer_constant_p (const_tree expr) |
6aa3c60d JM |
114 | { |
115 | /* This should really operate on c_expr structures, but they aren't | |
116 | yet available everywhere required. */ | |
117 | tree type = TREE_TYPE (expr); | |
118 | return (TREE_CODE (expr) == INTEGER_CST | |
8bcd6380 | 119 | && !TREE_OVERFLOW (expr) |
6aa3c60d JM |
120 | && integer_zerop (expr) |
121 | && (INTEGRAL_TYPE_P (type) | |
122 | || (TREE_CODE (type) == POINTER_TYPE | |
123 | && VOID_TYPE_P (TREE_TYPE (type)) | |
124 | && TYPE_QUALS (TREE_TYPE (type)) == TYPE_UNQUALIFIED))); | |
125 | } | |
f13c9b2c AP |
126 | \f/* This is a cache to hold if two types are compatible or not. */ |
127 | ||
128 | struct tagged_tu_seen_cache { | |
129 | const struct tagged_tu_seen_cache * next; | |
58f9752a KG |
130 | const_tree t1; |
131 | const_tree t2; | |
f13c9b2c AP |
132 | /* The return value of tagged_types_tu_compatible_p if we had seen |
133 | these two types already. */ | |
134 | int val; | |
135 | }; | |
136 | ||
137 | static const struct tagged_tu_seen_cache * tagged_tu_seen_base; | |
138 | static void free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *); | |
139 | ||
400fbf9f JW |
140 | /* Do `exp = require_complete_type (exp);' to make sure exp |
141 | does not have an incomplete type. (That includes void types.) */ | |
142 | ||
143 | tree | |
2f6e4e97 | 144 | require_complete_type (tree value) |
400fbf9f JW |
145 | { |
146 | tree type = TREE_TYPE (value); | |
147 | ||
c3d5c3fa | 148 | if (value == error_mark_node || type == error_mark_node) |
ea0f786b CB |
149 | return error_mark_node; |
150 | ||
400fbf9f | 151 | /* First, detect a valid value with a complete type. */ |
d0f062fb | 152 | if (COMPLETE_TYPE_P (type)) |
400fbf9f JW |
153 | return value; |
154 | ||
7a228918 | 155 | c_incomplete_type_error (value, type); |
400fbf9f JW |
156 | return error_mark_node; |
157 | } | |
158 | ||
159 | /* Print an error message for invalid use of an incomplete type. | |
160 | VALUE is the expression that was used (or 0 if that isn't known) | |
161 | and TYPE is the type that was invalid. */ | |
162 | ||
163 | void | |
ac7d7749 | 164 | c_incomplete_type_error (const_tree value, const_tree type) |
400fbf9f | 165 | { |
5d5993dd | 166 | const char *type_code_string; |
400fbf9f JW |
167 | |
168 | /* Avoid duplicate error message. */ | |
169 | if (TREE_CODE (type) == ERROR_MARK) | |
170 | return; | |
171 | ||
172 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
173 | || TREE_CODE (value) == PARM_DECL)) | |
c51a1ba9 | 174 | error ("%qD has an incomplete type", value); |
400fbf9f JW |
175 | else |
176 | { | |
177 | retry: | |
178 | /* We must print an error message. Be clever about what it says. */ | |
179 | ||
180 | switch (TREE_CODE (type)) | |
181 | { | |
182 | case RECORD_TYPE: | |
ab87f8c8 | 183 | type_code_string = "struct"; |
400fbf9f JW |
184 | break; |
185 | ||
186 | case UNION_TYPE: | |
ab87f8c8 | 187 | type_code_string = "union"; |
400fbf9f JW |
188 | break; |
189 | ||
190 | case ENUMERAL_TYPE: | |
ab87f8c8 | 191 | type_code_string = "enum"; |
400fbf9f JW |
192 | break; |
193 | ||
194 | case VOID_TYPE: | |
195 | error ("invalid use of void expression"); | |
196 | return; | |
197 | ||
198 | case ARRAY_TYPE: | |
199 | if (TYPE_DOMAIN (type)) | |
200 | { | |
fba78abb RH |
201 | if (TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL) |
202 | { | |
203 | error ("invalid use of flexible array member"); | |
204 | return; | |
205 | } | |
400fbf9f JW |
206 | type = TREE_TYPE (type); |
207 | goto retry; | |
208 | } | |
209 | error ("invalid use of array with unspecified bounds"); | |
210 | return; | |
211 | ||
212 | default: | |
366de0ce | 213 | gcc_unreachable (); |
400fbf9f JW |
214 | } |
215 | ||
216 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
c51a1ba9 JM |
217 | error ("invalid use of undefined type %<%s %E%>", |
218 | type_code_string, TYPE_NAME (type)); | |
400fbf9f JW |
219 | else |
220 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
c51a1ba9 | 221 | error ("invalid use of incomplete typedef %qD", TYPE_NAME (type)); |
400fbf9f JW |
222 | } |
223 | } | |
224 | ||
ab393bf1 NB |
225 | /* Given a type, apply default promotions wrt unnamed function |
226 | arguments and return the new type. */ | |
227 | ||
228 | tree | |
2f6e4e97 | 229 | c_type_promotes_to (tree type) |
ab393bf1 NB |
230 | { |
231 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
232 | return double_type_node; | |
233 | ||
234 | if (c_promoting_integer_type_p (type)) | |
235 | { | |
236 | /* Preserve unsignedness if not really getting any wider. */ | |
8df83eae | 237 | if (TYPE_UNSIGNED (type) |
c22cacf3 MS |
238 | && (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) |
239 | return unsigned_type_node; | |
ab393bf1 NB |
240 | return integer_type_node; |
241 | } | |
242 | ||
243 | return type; | |
244 | } | |
245 | ||
400fbf9f JW |
246 | /* Return a variant of TYPE which has all the type qualifiers of LIKE |
247 | as well as those of TYPE. */ | |
248 | ||
249 | static tree | |
2f6e4e97 | 250 | qualify_type (tree type, tree like) |
400fbf9f | 251 | { |
2f6e4e97 | 252 | return c_build_qualified_type (type, |
afbadaa7 | 253 | TYPE_QUALS (type) | TYPE_QUALS (like)); |
400fbf9f | 254 | } |
52ffd86e MS |
255 | |
256 | /* Return true iff the given tree T is a variable length array. */ | |
257 | ||
258 | bool | |
ac7d7749 | 259 | c_vla_type_p (const_tree t) |
52ffd86e MS |
260 | { |
261 | if (TREE_CODE (t) == ARRAY_TYPE | |
262 | && C_TYPE_VARIABLE_SIZE (t)) | |
263 | return true; | |
264 | return false; | |
265 | } | |
400fbf9f | 266 | \f |
10bc1b1b | 267 | /* Return the composite type of two compatible types. |
5305f6d7 | 268 | |
10bc1b1b JM |
269 | We assume that comptypes has already been done and returned |
270 | nonzero; if that isn't so, this may crash. In particular, we | |
271 | assume that qualifiers match. */ | |
400fbf9f JW |
272 | |
273 | tree | |
10bc1b1b | 274 | composite_type (tree t1, tree t2) |
400fbf9f | 275 | { |
b3694847 SS |
276 | enum tree_code code1; |
277 | enum tree_code code2; | |
4b027d16 | 278 | tree attributes; |
400fbf9f JW |
279 | |
280 | /* Save time if the two types are the same. */ | |
281 | ||
282 | if (t1 == t2) return t1; | |
283 | ||
284 | /* If one type is nonsense, use the other. */ | |
285 | if (t1 == error_mark_node) | |
286 | return t2; | |
287 | if (t2 == error_mark_node) | |
288 | return t1; | |
289 | ||
10bc1b1b JM |
290 | code1 = TREE_CODE (t1); |
291 | code2 = TREE_CODE (t2); | |
292 | ||
d9525bec | 293 | /* Merge the attributes. */ |
5fd9b178 | 294 | attributes = targetm.merge_type_attributes (t1, t2); |
4b027d16 | 295 | |
10bc1b1b JM |
296 | /* If one is an enumerated type and the other is the compatible |
297 | integer type, the composite type might be either of the two | |
298 | (DR#013 question 3). For consistency, use the enumerated type as | |
299 | the composite type. */ | |
400fbf9f | 300 | |
10bc1b1b JM |
301 | if (code1 == ENUMERAL_TYPE && code2 == INTEGER_TYPE) |
302 | return t1; | |
303 | if (code2 == ENUMERAL_TYPE && code1 == INTEGER_TYPE) | |
304 | return t2; | |
75326e8c | 305 | |
366de0ce | 306 | gcc_assert (code1 == code2); |
b6a10c9f | 307 | |
400fbf9f JW |
308 | switch (code1) |
309 | { | |
400fbf9f | 310 | case POINTER_TYPE: |
10bc1b1b | 311 | /* For two pointers, do this recursively on the target type. */ |
400fbf9f | 312 | { |
3932261a MM |
313 | tree pointed_to_1 = TREE_TYPE (t1); |
314 | tree pointed_to_2 = TREE_TYPE (t2); | |
10bc1b1b JM |
315 | tree target = composite_type (pointed_to_1, pointed_to_2); |
316 | t1 = build_pointer_type (target); | |
fe7080d2 AP |
317 | t1 = build_type_attribute_variant (t1, attributes); |
318 | return qualify_type (t1, t2); | |
400fbf9f | 319 | } |
400fbf9f JW |
320 | |
321 | case ARRAY_TYPE: | |
322 | { | |
10bc1b1b | 323 | tree elt = composite_type (TREE_TYPE (t1), TREE_TYPE (t2)); |
46df2823 JM |
324 | int quals; |
325 | tree unqual_elt; | |
ca8bdb78 JM |
326 | tree d1 = TYPE_DOMAIN (t1); |
327 | tree d2 = TYPE_DOMAIN (t2); | |
328 | bool d1_variable, d2_variable; | |
329 | bool d1_zero, d2_zero; | |
46df2823 | 330 | |
de46b2fe | 331 | /* We should not have any type quals on arrays at all. */ |
366de0ce | 332 | gcc_assert (!TYPE_QUALS (t1) && !TYPE_QUALS (t2)); |
c22cacf3 | 333 | |
ca8bdb78 JM |
334 | d1_zero = d1 == 0 || !TYPE_MAX_VALUE (d1); |
335 | d2_zero = d2 == 0 || !TYPE_MAX_VALUE (d2); | |
336 | ||
337 | d1_variable = (!d1_zero | |
338 | && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
339 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST)); | |
340 | d2_variable = (!d2_zero | |
341 | && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
342 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)); | |
52ffd86e MS |
343 | d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1)); |
344 | d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2)); | |
ca8bdb78 | 345 | |
400fbf9f | 346 | /* Save space: see if the result is identical to one of the args. */ |
ca8bdb78 JM |
347 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1) |
348 | && (d2_variable || d2_zero || !d1_variable)) | |
4b027d16 | 349 | return build_type_attribute_variant (t1, attributes); |
ca8bdb78 JM |
350 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2) |
351 | && (d1_variable || d1_zero || !d2_variable)) | |
4b027d16 | 352 | return build_type_attribute_variant (t2, attributes); |
c22cacf3 | 353 | |
de46b2fe AP |
354 | if (elt == TREE_TYPE (t1) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1)) |
355 | return build_type_attribute_variant (t1, attributes); | |
356 | if (elt == TREE_TYPE (t2) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1)) | |
357 | return build_type_attribute_variant (t2, attributes); | |
c22cacf3 | 358 | |
46df2823 JM |
359 | /* Merge the element types, and have a size if either arg has |
360 | one. We may have qualifiers on the element types. To set | |
361 | up TYPE_MAIN_VARIANT correctly, we need to form the | |
362 | composite of the unqualified types and add the qualifiers | |
363 | back at the end. */ | |
364 | quals = TYPE_QUALS (strip_array_types (elt)); | |
365 | unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED); | |
366 | t1 = build_array_type (unqual_elt, | |
ca8bdb78 JM |
367 | TYPE_DOMAIN ((TYPE_DOMAIN (t1) |
368 | && (d2_variable | |
369 | || d2_zero | |
370 | || !d1_variable)) | |
371 | ? t1 | |
372 | : t2)); | |
46df2823 | 373 | t1 = c_build_qualified_type (t1, quals); |
de46b2fe | 374 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
375 | } |
376 | ||
fcb99e7b JJ |
377 | case ENUMERAL_TYPE: |
378 | case RECORD_TYPE: | |
379 | case UNION_TYPE: | |
380 | if (attributes != NULL) | |
381 | { | |
382 | /* Try harder not to create a new aggregate type. */ | |
383 | if (attribute_list_equal (TYPE_ATTRIBUTES (t1), attributes)) | |
384 | return t1; | |
385 | if (attribute_list_equal (TYPE_ATTRIBUTES (t2), attributes)) | |
386 | return t2; | |
387 | } | |
388 | return build_type_attribute_variant (t1, attributes); | |
389 | ||
400fbf9f JW |
390 | case FUNCTION_TYPE: |
391 | /* Function types: prefer the one that specified arg types. | |
392 | If both do, merge the arg types. Also merge the return types. */ | |
393 | { | |
10bc1b1b | 394 | tree valtype = composite_type (TREE_TYPE (t1), TREE_TYPE (t2)); |
400fbf9f JW |
395 | tree p1 = TYPE_ARG_TYPES (t1); |
396 | tree p2 = TYPE_ARG_TYPES (t2); | |
397 | int len; | |
398 | tree newargs, n; | |
399 | int i; | |
400 | ||
401 | /* Save space: see if the result is identical to one of the args. */ | |
3f75a254 | 402 | if (valtype == TREE_TYPE (t1) && !TYPE_ARG_TYPES (t2)) |
4b027d16 | 403 | return build_type_attribute_variant (t1, attributes); |
3f75a254 | 404 | if (valtype == TREE_TYPE (t2) && !TYPE_ARG_TYPES (t1)) |
4b027d16 | 405 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
406 | |
407 | /* Simple way if one arg fails to specify argument types. */ | |
408 | if (TYPE_ARG_TYPES (t1) == 0) | |
4b027d16 | 409 | { |
fe7080d2 AP |
410 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2)); |
411 | t1 = build_type_attribute_variant (t1, attributes); | |
412 | return qualify_type (t1, t2); | |
4b027d16 | 413 | } |
400fbf9f | 414 | if (TYPE_ARG_TYPES (t2) == 0) |
4b027d16 RK |
415 | { |
416 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
fe7080d2 AP |
417 | t1 = build_type_attribute_variant (t1, attributes); |
418 | return qualify_type (t1, t2); | |
4b027d16 | 419 | } |
400fbf9f JW |
420 | |
421 | /* If both args specify argument types, we must merge the two | |
422 | lists, argument by argument. */ | |
f75fbaf7 | 423 | /* Tell global_bindings_p to return false so that variable_size |
535a42b1 | 424 | doesn't die on VLAs in parameter types. */ |
f75fbaf7 | 425 | c_override_global_bindings_to_false = true; |
2f4e8f2b | 426 | |
400fbf9f JW |
427 | len = list_length (p1); |
428 | newargs = 0; | |
429 | ||
430 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 431 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
432 | |
433 | n = newargs; | |
434 | ||
435 | for (; p1; | |
436 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
437 | { | |
438 | /* A null type means arg type is not specified. | |
439 | Take whatever the other function type has. */ | |
440 | if (TREE_VALUE (p1) == 0) | |
441 | { | |
442 | TREE_VALUE (n) = TREE_VALUE (p2); | |
443 | goto parm_done; | |
444 | } | |
445 | if (TREE_VALUE (p2) == 0) | |
446 | { | |
447 | TREE_VALUE (n) = TREE_VALUE (p1); | |
448 | goto parm_done; | |
449 | } | |
2f6e4e97 | 450 | |
400fbf9f JW |
451 | /* Given wait (union {union wait *u; int *i} *) |
452 | and wait (union wait *), | |
453 | prefer union wait * as type of parm. */ | |
454 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
455 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
456 | { | |
457 | tree memb; | |
58cb41e6 JJ |
458 | tree mv2 = TREE_VALUE (p2); |
459 | if (mv2 && mv2 != error_mark_node | |
460 | && TREE_CODE (mv2) != ARRAY_TYPE) | |
461 | mv2 = TYPE_MAIN_VARIANT (mv2); | |
400fbf9f JW |
462 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); |
463 | memb; memb = TREE_CHAIN (memb)) | |
58cb41e6 JJ |
464 | { |
465 | tree mv3 = TREE_TYPE (memb); | |
466 | if (mv3 && mv3 != error_mark_node | |
467 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
468 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
469 | if (comptypes (mv3, mv2)) | |
470 | { | |
471 | TREE_VALUE (n) = composite_type (TREE_TYPE (memb), | |
472 | TREE_VALUE (p2)); | |
473 | if (pedantic) | |
474 | pedwarn ("function types not truly compatible in ISO C"); | |
475 | goto parm_done; | |
476 | } | |
477 | } | |
400fbf9f JW |
478 | } |
479 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
480 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
481 | { | |
482 | tree memb; | |
58cb41e6 JJ |
483 | tree mv1 = TREE_VALUE (p1); |
484 | if (mv1 && mv1 != error_mark_node | |
485 | && TREE_CODE (mv1) != ARRAY_TYPE) | |
486 | mv1 = TYPE_MAIN_VARIANT (mv1); | |
400fbf9f JW |
487 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); |
488 | memb; memb = TREE_CHAIN (memb)) | |
58cb41e6 JJ |
489 | { |
490 | tree mv3 = TREE_TYPE (memb); | |
491 | if (mv3 && mv3 != error_mark_node | |
492 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
493 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
494 | if (comptypes (mv3, mv1)) | |
495 | { | |
496 | TREE_VALUE (n) = composite_type (TREE_TYPE (memb), | |
497 | TREE_VALUE (p1)); | |
498 | if (pedantic) | |
499 | pedwarn ("function types not truly compatible in ISO C"); | |
500 | goto parm_done; | |
501 | } | |
502 | } | |
400fbf9f | 503 | } |
10bc1b1b | 504 | TREE_VALUE (n) = composite_type (TREE_VALUE (p1), TREE_VALUE (p2)); |
400fbf9f JW |
505 | parm_done: ; |
506 | } | |
507 | ||
f75fbaf7 | 508 | c_override_global_bindings_to_false = false; |
4b027d16 | 509 | t1 = build_function_type (valtype, newargs); |
fe7080d2 | 510 | t1 = qualify_type (t1, t2); |
0f41302f | 511 | /* ... falls through ... */ |
400fbf9f JW |
512 | } |
513 | ||
514 | default: | |
4b027d16 | 515 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
516 | } |
517 | ||
518 | } | |
10bc1b1b JM |
519 | |
520 | /* Return the type of a conditional expression between pointers to | |
521 | possibly differently qualified versions of compatible types. | |
522 | ||
523 | We assume that comp_target_types has already been done and returned | |
524 | nonzero; if that isn't so, this may crash. */ | |
525 | ||
526 | static tree | |
527 | common_pointer_type (tree t1, tree t2) | |
528 | { | |
529 | tree attributes; | |
46df2823 JM |
530 | tree pointed_to_1, mv1; |
531 | tree pointed_to_2, mv2; | |
10bc1b1b | 532 | tree target; |
eb1387a0 | 533 | unsigned target_quals; |
10bc1b1b JM |
534 | |
535 | /* Save time if the two types are the same. */ | |
536 | ||
537 | if (t1 == t2) return t1; | |
538 | ||
539 | /* If one type is nonsense, use the other. */ | |
540 | if (t1 == error_mark_node) | |
541 | return t2; | |
542 | if (t2 == error_mark_node) | |
543 | return t1; | |
544 | ||
366de0ce | 545 | gcc_assert (TREE_CODE (t1) == POINTER_TYPE |
c22cacf3 | 546 | && TREE_CODE (t2) == POINTER_TYPE); |
10bc1b1b JM |
547 | |
548 | /* Merge the attributes. */ | |
549 | attributes = targetm.merge_type_attributes (t1, t2); | |
550 | ||
551 | /* Find the composite type of the target types, and combine the | |
46df2823 JM |
552 | qualifiers of the two types' targets. Do not lose qualifiers on |
553 | array element types by taking the TYPE_MAIN_VARIANT. */ | |
554 | mv1 = pointed_to_1 = TREE_TYPE (t1); | |
555 | mv2 = pointed_to_2 = TREE_TYPE (t2); | |
556 | if (TREE_CODE (mv1) != ARRAY_TYPE) | |
557 | mv1 = TYPE_MAIN_VARIANT (pointed_to_1); | |
558 | if (TREE_CODE (mv2) != ARRAY_TYPE) | |
559 | mv2 = TYPE_MAIN_VARIANT (pointed_to_2); | |
560 | target = composite_type (mv1, mv2); | |
eb1387a0 RG |
561 | |
562 | /* For function types do not merge const qualifiers, but drop them | |
563 | if used inconsistently. The middle-end uses these to mark const | |
564 | and noreturn functions. */ | |
565 | if (TREE_CODE (pointed_to_1) == FUNCTION_TYPE) | |
566 | target_quals = TYPE_QUALS (pointed_to_1) & TYPE_QUALS (pointed_to_2); | |
567 | else | |
568 | target_quals = TYPE_QUALS (pointed_to_1) | TYPE_QUALS (pointed_to_2); | |
569 | t1 = build_pointer_type (c_build_qualified_type (target, target_quals)); | |
10bc1b1b JM |
570 | return build_type_attribute_variant (t1, attributes); |
571 | } | |
572 | ||
573 | /* Return the common type for two arithmetic types under the usual | |
574 | arithmetic conversions. The default conversions have already been | |
575 | applied, and enumerated types converted to their compatible integer | |
576 | types. The resulting type is unqualified and has no attributes. | |
577 | ||
578 | This is the type for the result of most arithmetic operations | |
579 | if the operands have the given two types. */ | |
580 | ||
ccf7f880 JJ |
581 | static tree |
582 | c_common_type (tree t1, tree t2) | |
10bc1b1b JM |
583 | { |
584 | enum tree_code code1; | |
585 | enum tree_code code2; | |
586 | ||
587 | /* If one type is nonsense, use the other. */ | |
588 | if (t1 == error_mark_node) | |
589 | return t2; | |
590 | if (t2 == error_mark_node) | |
591 | return t1; | |
592 | ||
593 | if (TYPE_QUALS (t1) != TYPE_UNQUALIFIED) | |
594 | t1 = TYPE_MAIN_VARIANT (t1); | |
595 | ||
596 | if (TYPE_QUALS (t2) != TYPE_UNQUALIFIED) | |
597 | t2 = TYPE_MAIN_VARIANT (t2); | |
598 | ||
599 | if (TYPE_ATTRIBUTES (t1) != NULL_TREE) | |
600 | t1 = build_type_attribute_variant (t1, NULL_TREE); | |
601 | ||
602 | if (TYPE_ATTRIBUTES (t2) != NULL_TREE) | |
603 | t2 = build_type_attribute_variant (t2, NULL_TREE); | |
604 | ||
605 | /* Save time if the two types are the same. */ | |
606 | ||
607 | if (t1 == t2) return t1; | |
608 | ||
609 | code1 = TREE_CODE (t1); | |
610 | code2 = TREE_CODE (t2); | |
611 | ||
366de0ce | 612 | gcc_assert (code1 == VECTOR_TYPE || code1 == COMPLEX_TYPE |
ab22c1fa CF |
613 | || code1 == FIXED_POINT_TYPE || code1 == REAL_TYPE |
614 | || code1 == INTEGER_TYPE); | |
366de0ce | 615 | gcc_assert (code2 == VECTOR_TYPE || code2 == COMPLEX_TYPE |
ab22c1fa CF |
616 | || code2 == FIXED_POINT_TYPE || code2 == REAL_TYPE |
617 | || code2 == INTEGER_TYPE); | |
10bc1b1b | 618 | |
5fc89bfd JJ |
619 | /* When one operand is a decimal float type, the other operand cannot be |
620 | a generic float type or a complex type. We also disallow vector types | |
621 | here. */ | |
622 | if ((DECIMAL_FLOAT_TYPE_P (t1) || DECIMAL_FLOAT_TYPE_P (t2)) | |
623 | && !(DECIMAL_FLOAT_TYPE_P (t1) && DECIMAL_FLOAT_TYPE_P (t2))) | |
624 | { | |
625 | if (code1 == VECTOR_TYPE || code2 == VECTOR_TYPE) | |
626 | { | |
627 | error ("can%'t mix operands of decimal float and vector types"); | |
628 | return error_mark_node; | |
629 | } | |
630 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
631 | { | |
632 | error ("can%'t mix operands of decimal float and complex types"); | |
633 | return error_mark_node; | |
634 | } | |
635 | if (code1 == REAL_TYPE && code2 == REAL_TYPE) | |
636 | { | |
637 | error ("can%'t mix operands of decimal float and other float types"); | |
638 | return error_mark_node; | |
639 | } | |
640 | } | |
641 | ||
10bc1b1b JM |
642 | /* If one type is a vector type, return that type. (How the usual |
643 | arithmetic conversions apply to the vector types extension is not | |
644 | precisely specified.) */ | |
645 | if (code1 == VECTOR_TYPE) | |
646 | return t1; | |
647 | ||
648 | if (code2 == VECTOR_TYPE) | |
649 | return t2; | |
650 | ||
651 | /* If one type is complex, form the common type of the non-complex | |
652 | components, then make that complex. Use T1 or T2 if it is the | |
653 | required type. */ | |
654 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
655 | { | |
656 | tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; | |
657 | tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; | |
ccf7f880 | 658 | tree subtype = c_common_type (subtype1, subtype2); |
10bc1b1b JM |
659 | |
660 | if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) | |
661 | return t1; | |
662 | else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) | |
663 | return t2; | |
664 | else | |
665 | return build_complex_type (subtype); | |
666 | } | |
667 | ||
668 | /* If only one is real, use it as the result. */ | |
669 | ||
670 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
671 | return t1; | |
672 | ||
673 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
674 | return t2; | |
675 | ||
9a8ce21f JG |
676 | /* If both are real and either are decimal floating point types, use |
677 | the decimal floating point type with the greater precision. */ | |
678 | ||
679 | if (code1 == REAL_TYPE && code2 == REAL_TYPE) | |
680 | { | |
681 | if (TYPE_MAIN_VARIANT (t1) == dfloat128_type_node | |
682 | || TYPE_MAIN_VARIANT (t2) == dfloat128_type_node) | |
683 | return dfloat128_type_node; | |
684 | else if (TYPE_MAIN_VARIANT (t1) == dfloat64_type_node | |
685 | || TYPE_MAIN_VARIANT (t2) == dfloat64_type_node) | |
686 | return dfloat64_type_node; | |
687 | else if (TYPE_MAIN_VARIANT (t1) == dfloat32_type_node | |
688 | || TYPE_MAIN_VARIANT (t2) == dfloat32_type_node) | |
689 | return dfloat32_type_node; | |
690 | } | |
691 | ||
ab22c1fa CF |
692 | /* Deal with fixed-point types. */ |
693 | if (code1 == FIXED_POINT_TYPE || code2 == FIXED_POINT_TYPE) | |
694 | { | |
695 | unsigned int unsignedp = 0, satp = 0; | |
696 | enum machine_mode m1, m2; | |
697 | unsigned int fbit1, ibit1, fbit2, ibit2, max_fbit, max_ibit; | |
698 | ||
699 | m1 = TYPE_MODE (t1); | |
700 | m2 = TYPE_MODE (t2); | |
701 | ||
702 | /* If one input type is saturating, the result type is saturating. */ | |
703 | if (TYPE_SATURATING (t1) || TYPE_SATURATING (t2)) | |
704 | satp = 1; | |
705 | ||
706 | /* If both fixed-point types are unsigned, the result type is unsigned. | |
707 | When mixing fixed-point and integer types, follow the sign of the | |
708 | fixed-point type. | |
709 | Otherwise, the result type is signed. */ | |
710 | if ((TYPE_UNSIGNED (t1) && TYPE_UNSIGNED (t2) | |
711 | && code1 == FIXED_POINT_TYPE && code2 == FIXED_POINT_TYPE) | |
712 | || (code1 == FIXED_POINT_TYPE && code2 != FIXED_POINT_TYPE | |
713 | && TYPE_UNSIGNED (t1)) | |
714 | || (code1 != FIXED_POINT_TYPE && code2 == FIXED_POINT_TYPE | |
715 | && TYPE_UNSIGNED (t2))) | |
716 | unsignedp = 1; | |
717 | ||
718 | /* The result type is signed. */ | |
719 | if (unsignedp == 0) | |
720 | { | |
721 | /* If the input type is unsigned, we need to convert to the | |
722 | signed type. */ | |
723 | if (code1 == FIXED_POINT_TYPE && TYPE_UNSIGNED (t1)) | |
724 | { | |
d75d71e0 | 725 | enum mode_class mclass = (enum mode_class) 0; |
ab22c1fa CF |
726 | if (GET_MODE_CLASS (m1) == MODE_UFRACT) |
727 | mclass = MODE_FRACT; | |
728 | else if (GET_MODE_CLASS (m1) == MODE_UACCUM) | |
729 | mclass = MODE_ACCUM; | |
730 | else | |
731 | gcc_unreachable (); | |
732 | m1 = mode_for_size (GET_MODE_PRECISION (m1), mclass, 0); | |
733 | } | |
734 | if (code2 == FIXED_POINT_TYPE && TYPE_UNSIGNED (t2)) | |
735 | { | |
d75d71e0 | 736 | enum mode_class mclass = (enum mode_class) 0; |
ab22c1fa CF |
737 | if (GET_MODE_CLASS (m2) == MODE_UFRACT) |
738 | mclass = MODE_FRACT; | |
739 | else if (GET_MODE_CLASS (m2) == MODE_UACCUM) | |
740 | mclass = MODE_ACCUM; | |
741 | else | |
742 | gcc_unreachable (); | |
743 | m2 = mode_for_size (GET_MODE_PRECISION (m2), mclass, 0); | |
744 | } | |
745 | } | |
746 | ||
747 | if (code1 == FIXED_POINT_TYPE) | |
748 | { | |
749 | fbit1 = GET_MODE_FBIT (m1); | |
750 | ibit1 = GET_MODE_IBIT (m1); | |
751 | } | |
752 | else | |
753 | { | |
754 | fbit1 = 0; | |
755 | /* Signed integers need to subtract one sign bit. */ | |
756 | ibit1 = TYPE_PRECISION (t1) - (!TYPE_UNSIGNED (t1)); | |
757 | } | |
758 | ||
759 | if (code2 == FIXED_POINT_TYPE) | |
760 | { | |
761 | fbit2 = GET_MODE_FBIT (m2); | |
762 | ibit2 = GET_MODE_IBIT (m2); | |
763 | } | |
764 | else | |
765 | { | |
766 | fbit2 = 0; | |
767 | /* Signed integers need to subtract one sign bit. */ | |
768 | ibit2 = TYPE_PRECISION (t2) - (!TYPE_UNSIGNED (t2)); | |
769 | } | |
770 | ||
771 | max_ibit = ibit1 >= ibit2 ? ibit1 : ibit2; | |
772 | max_fbit = fbit1 >= fbit2 ? fbit1 : fbit2; | |
773 | return c_common_fixed_point_type_for_size (max_ibit, max_fbit, unsignedp, | |
774 | satp); | |
775 | } | |
776 | ||
10bc1b1b JM |
777 | /* Both real or both integers; use the one with greater precision. */ |
778 | ||
779 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
780 | return t1; | |
781 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) | |
782 | return t2; | |
783 | ||
784 | /* Same precision. Prefer long longs to longs to ints when the | |
785 | same precision, following the C99 rules on integer type rank | |
786 | (which are equivalent to the C90 rules for C90 types). */ | |
787 | ||
788 | if (TYPE_MAIN_VARIANT (t1) == long_long_unsigned_type_node | |
789 | || TYPE_MAIN_VARIANT (t2) == long_long_unsigned_type_node) | |
790 | return long_long_unsigned_type_node; | |
791 | ||
792 | if (TYPE_MAIN_VARIANT (t1) == long_long_integer_type_node | |
793 | || TYPE_MAIN_VARIANT (t2) == long_long_integer_type_node) | |
794 | { | |
795 | if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) | |
796 | return long_long_unsigned_type_node; | |
797 | else | |
c22cacf3 | 798 | return long_long_integer_type_node; |
10bc1b1b JM |
799 | } |
800 | ||
801 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node | |
802 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
803 | return long_unsigned_type_node; | |
804 | ||
805 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node | |
806 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
807 | { | |
808 | /* But preserve unsignedness from the other type, | |
809 | since long cannot hold all the values of an unsigned int. */ | |
810 | if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) | |
811 | return long_unsigned_type_node; | |
812 | else | |
813 | return long_integer_type_node; | |
814 | } | |
815 | ||
816 | /* Likewise, prefer long double to double even if same size. */ | |
817 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node | |
818 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
819 | return long_double_type_node; | |
820 | ||
821 | /* Otherwise prefer the unsigned one. */ | |
822 | ||
823 | if (TYPE_UNSIGNED (t1)) | |
824 | return t1; | |
825 | else | |
826 | return t2; | |
827 | } | |
400fbf9f | 828 | \f |
5922c215 JM |
829 | /* Wrapper around c_common_type that is used by c-common.c and other |
830 | front end optimizations that remove promotions. ENUMERAL_TYPEs | |
b2232745 RS |
831 | are allowed here and are converted to their compatible integer types. |
832 | BOOLEAN_TYPEs are allowed here and return either boolean_type_node or | |
833 | preferably a non-Boolean type as the common type. */ | |
ccf7f880 JJ |
834 | tree |
835 | common_type (tree t1, tree t2) | |
836 | { | |
837 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
838 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1); | |
839 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
840 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1); | |
b2232745 RS |
841 | |
842 | /* If both types are BOOLEAN_TYPE, then return boolean_type_node. */ | |
843 | if (TREE_CODE (t1) == BOOLEAN_TYPE | |
844 | && TREE_CODE (t2) == BOOLEAN_TYPE) | |
845 | return boolean_type_node; | |
846 | ||
847 | /* If either type is BOOLEAN_TYPE, then return the other. */ | |
848 | if (TREE_CODE (t1) == BOOLEAN_TYPE) | |
849 | return t2; | |
850 | if (TREE_CODE (t2) == BOOLEAN_TYPE) | |
851 | return t1; | |
852 | ||
ccf7f880 JJ |
853 | return c_common_type (t1, t2); |
854 | } | |
f13c9b2c | 855 | |
400fbf9f JW |
856 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment |
857 | or various other operations. Return 2 if they are compatible | |
858 | but a warning may be needed if you use them together. */ | |
859 | ||
860 | int | |
132da1a5 | 861 | comptypes (tree type1, tree type2) |
f13c9b2c AP |
862 | { |
863 | const struct tagged_tu_seen_cache * tagged_tu_seen_base1 = tagged_tu_seen_base; | |
864 | int val; | |
865 | ||
866 | val = comptypes_internal (type1, type2); | |
867 | free_all_tagged_tu_seen_up_to (tagged_tu_seen_base1); | |
c22cacf3 | 868 | |
f13c9b2c | 869 | return val; |
c22cacf3 MS |
870 | } |
871 | \f | |
f13c9b2c AP |
872 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment |
873 | or various other operations. Return 2 if they are compatible | |
874 | but a warning may be needed if you use them together. This | |
875 | differs from comptypes, in that we don't free the seen types. */ | |
876 | ||
877 | static int | |
58f9752a | 878 | comptypes_internal (const_tree type1, const_tree type2) |
400fbf9f | 879 | { |
58f9752a KG |
880 | const_tree t1 = type1; |
881 | const_tree t2 = type2; | |
4b027d16 | 882 | int attrval, val; |
400fbf9f JW |
883 | |
884 | /* Suppress errors caused by previously reported errors. */ | |
885 | ||
8d47dfc5 RH |
886 | if (t1 == t2 || !t1 || !t2 |
887 | || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
400fbf9f JW |
888 | return 1; |
889 | ||
21318741 RK |
890 | /* If either type is the internal version of sizetype, return the |
891 | language version. */ | |
892 | if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1) | |
eb1a2c88 DN |
893 | && TYPE_ORIG_SIZE_TYPE (t1)) |
894 | t1 = TYPE_ORIG_SIZE_TYPE (t1); | |
21318741 RK |
895 | |
896 | if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2) | |
eb1a2c88 DN |
897 | && TYPE_ORIG_SIZE_TYPE (t2)) |
898 | t2 = TYPE_ORIG_SIZE_TYPE (t2); | |
899 | ||
21318741 | 900 | |
bca63328 JM |
901 | /* Enumerated types are compatible with integer types, but this is |
902 | not transitive: two enumerated types in the same translation unit | |
903 | are compatible with each other only if they are the same type. */ | |
400fbf9f | 904 | |
bca63328 | 905 | if (TREE_CODE (t1) == ENUMERAL_TYPE && TREE_CODE (t2) != ENUMERAL_TYPE) |
8df83eae | 906 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), TYPE_UNSIGNED (t1)); |
bca63328 | 907 | else if (TREE_CODE (t2) == ENUMERAL_TYPE && TREE_CODE (t1) != ENUMERAL_TYPE) |
8df83eae | 908 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), TYPE_UNSIGNED (t2)); |
400fbf9f JW |
909 | |
910 | if (t1 == t2) | |
911 | return 1; | |
912 | ||
913 | /* Different classes of types can't be compatible. */ | |
914 | ||
3aeb3655 EC |
915 | if (TREE_CODE (t1) != TREE_CODE (t2)) |
916 | return 0; | |
400fbf9f | 917 | |
118a3a8b | 918 | /* Qualifiers must match. C99 6.7.3p9 */ |
400fbf9f | 919 | |
3932261a | 920 | if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) |
400fbf9f JW |
921 | return 0; |
922 | ||
08632da2 RS |
923 | /* Allow for two different type nodes which have essentially the same |
924 | definition. Note that we already checked for equality of the type | |
38e01259 | 925 | qualifiers (just above). */ |
400fbf9f | 926 | |
46df2823 JM |
927 | if (TREE_CODE (t1) != ARRAY_TYPE |
928 | && TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
400fbf9f JW |
929 | return 1; |
930 | ||
4b027d16 | 931 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ |
3f75a254 | 932 | if (!(attrval = targetm.comp_type_attributes (t1, t2))) |
4b027d16 RK |
933 | return 0; |
934 | ||
935 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
936 | val = 0; | |
937 | ||
400fbf9f JW |
938 | switch (TREE_CODE (t1)) |
939 | { | |
940 | case POINTER_TYPE: | |
106f5de5 UW |
941 | /* Do not remove mode or aliasing information. */ |
942 | if (TYPE_MODE (t1) != TYPE_MODE (t2) | |
943 | || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2)) | |
944 | break; | |
4b027d16 | 945 | val = (TREE_TYPE (t1) == TREE_TYPE (t2) |
f13c9b2c | 946 | ? 1 : comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2))); |
4b027d16 | 947 | break; |
400fbf9f JW |
948 | |
949 | case FUNCTION_TYPE: | |
132da1a5 | 950 | val = function_types_compatible_p (t1, t2); |
4b027d16 | 951 | break; |
400fbf9f JW |
952 | |
953 | case ARRAY_TYPE: | |
954 | { | |
400fbf9f JW |
955 | tree d1 = TYPE_DOMAIN (t1); |
956 | tree d2 = TYPE_DOMAIN (t2); | |
3f85558f RH |
957 | bool d1_variable, d2_variable; |
958 | bool d1_zero, d2_zero; | |
4b027d16 | 959 | val = 1; |
400fbf9f JW |
960 | |
961 | /* Target types must match incl. qualifiers. */ | |
962 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
f13c9b2c | 963 | && 0 == (val = comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2)))) |
400fbf9f JW |
964 | return 0; |
965 | ||
966 | /* Sizes must match unless one is missing or variable. */ | |
3f85558f | 967 | if (d1 == 0 || d2 == 0 || d1 == d2) |
4b027d16 | 968 | break; |
400fbf9f | 969 | |
3f75a254 JM |
970 | d1_zero = !TYPE_MAX_VALUE (d1); |
971 | d2_zero = !TYPE_MAX_VALUE (d2); | |
3f85558f | 972 | |
3f75a254 | 973 | d1_variable = (!d1_zero |
3f85558f RH |
974 | && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST |
975 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST)); | |
3f75a254 | 976 | d2_variable = (!d2_zero |
3f85558f RH |
977 | && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST |
978 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)); | |
52ffd86e MS |
979 | d1_variable = d1_variable || (d1_zero && c_vla_type_p (t1)); |
980 | d2_variable = d2_variable || (d2_zero && c_vla_type_p (t2)); | |
3f85558f RH |
981 | |
982 | if (d1_variable || d2_variable) | |
983 | break; | |
984 | if (d1_zero && d2_zero) | |
985 | break; | |
986 | if (d1_zero || d2_zero | |
3f75a254 JM |
987 | || !tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2)) |
988 | || !tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2))) | |
05bccae2 RK |
989 | val = 0; |
990 | ||
c22cacf3 | 991 | break; |
400fbf9f JW |
992 | } |
993 | ||
d1bd0ded | 994 | case ENUMERAL_TYPE: |
58393038 | 995 | case RECORD_TYPE: |
d1bd0ded | 996 | case UNION_TYPE: |
766beae1 | 997 | if (val != 1 && !same_translation_unit_p (t1, t2)) |
c22cacf3 | 998 | { |
fcb99e7b JJ |
999 | tree a1 = TYPE_ATTRIBUTES (t1); |
1000 | tree a2 = TYPE_ATTRIBUTES (t2); | |
1001 | ||
1002 | if (! attribute_list_contained (a1, a2) | |
1003 | && ! attribute_list_contained (a2, a1)) | |
1004 | break; | |
1005 | ||
f13c9b2c AP |
1006 | if (attrval != 2) |
1007 | return tagged_types_tu_compatible_p (t1, t2); | |
1008 | val = tagged_types_tu_compatible_p (t1, t2); | |
1009 | } | |
4b027d16 | 1010 | break; |
e9a25f70 | 1011 | |
62e1dfcf | 1012 | case VECTOR_TYPE: |
cc27e657 | 1013 | val = TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) |
f13c9b2c | 1014 | && comptypes_internal (TREE_TYPE (t1), TREE_TYPE (t2)); |
62e1dfcf NC |
1015 | break; |
1016 | ||
e9a25f70 JL |
1017 | default: |
1018 | break; | |
400fbf9f | 1019 | } |
4b027d16 | 1020 | return attrval == 2 && val == 1 ? 2 : val; |
400fbf9f JW |
1021 | } |
1022 | ||
1023 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
58393038 | 1024 | ignoring their qualifiers. */ |
400fbf9f JW |
1025 | |
1026 | static int | |
58393038 | 1027 | comp_target_types (tree ttl, tree ttr) |
400fbf9f | 1028 | { |
392202b0 | 1029 | int val; |
46df2823 | 1030 | tree mvl, mvr; |
8b40563c | 1031 | |
46df2823 JM |
1032 | /* Do not lose qualifiers on element types of array types that are |
1033 | pointer targets by taking their TYPE_MAIN_VARIANT. */ | |
1034 | mvl = TREE_TYPE (ttl); | |
1035 | mvr = TREE_TYPE (ttr); | |
1036 | if (TREE_CODE (mvl) != ARRAY_TYPE) | |
1037 | mvl = TYPE_MAIN_VARIANT (mvl); | |
1038 | if (TREE_CODE (mvr) != ARRAY_TYPE) | |
1039 | mvr = TYPE_MAIN_VARIANT (mvr); | |
1040 | val = comptypes (mvl, mvr); | |
8b40563c | 1041 | |
400fbf9f JW |
1042 | if (val == 2 && pedantic) |
1043 | pedwarn ("types are not quite compatible"); | |
1044 | return val; | |
1045 | } | |
1046 | \f | |
1047 | /* Subroutines of `comptypes'. */ | |
1048 | ||
f75fbaf7 ZW |
1049 | /* Determine whether two trees derive from the same translation unit. |
1050 | If the CONTEXT chain ends in a null, that tree's context is still | |
1051 | being parsed, so if two trees have context chains ending in null, | |
766beae1 | 1052 | they're in the same translation unit. */ |
f75fbaf7 | 1053 | int |
58f9752a | 1054 | same_translation_unit_p (const_tree t1, const_tree t2) |
766beae1 ZW |
1055 | { |
1056 | while (t1 && TREE_CODE (t1) != TRANSLATION_UNIT_DECL) | |
1057 | switch (TREE_CODE_CLASS (TREE_CODE (t1))) | |
1058 | { | |
6615c446 JO |
1059 | case tcc_declaration: |
1060 | t1 = DECL_CONTEXT (t1); break; | |
1061 | case tcc_type: | |
1062 | t1 = TYPE_CONTEXT (t1); break; | |
1063 | case tcc_exceptional: | |
1064 | t1 = BLOCK_SUPERCONTEXT (t1); break; /* assume block */ | |
366de0ce | 1065 | default: gcc_unreachable (); |
766beae1 ZW |
1066 | } |
1067 | ||
1068 | while (t2 && TREE_CODE (t2) != TRANSLATION_UNIT_DECL) | |
1069 | switch (TREE_CODE_CLASS (TREE_CODE (t2))) | |
1070 | { | |
6615c446 JO |
1071 | case tcc_declaration: |
1072 | t2 = DECL_CONTEXT (t2); break; | |
1073 | case tcc_type: | |
1074 | t2 = TYPE_CONTEXT (t2); break; | |
1075 | case tcc_exceptional: | |
1076 | t2 = BLOCK_SUPERCONTEXT (t2); break; /* assume block */ | |
366de0ce | 1077 | default: gcc_unreachable (); |
766beae1 ZW |
1078 | } |
1079 | ||
1080 | return t1 == t2; | |
1081 | } | |
1082 | ||
f13c9b2c | 1083 | /* Allocate the seen two types, assuming that they are compatible. */ |
d1bd0ded | 1084 | |
f13c9b2c | 1085 | static struct tagged_tu_seen_cache * |
58f9752a | 1086 | alloc_tagged_tu_seen_cache (const_tree t1, const_tree t2) |
f13c9b2c | 1087 | { |
cceb1885 | 1088 | struct tagged_tu_seen_cache *tu = XNEW (struct tagged_tu_seen_cache); |
f13c9b2c AP |
1089 | tu->next = tagged_tu_seen_base; |
1090 | tu->t1 = t1; | |
1091 | tu->t2 = t2; | |
c22cacf3 | 1092 | |
f13c9b2c | 1093 | tagged_tu_seen_base = tu; |
c22cacf3 | 1094 | |
f13c9b2c AP |
1095 | /* The C standard says that two structures in different translation |
1096 | units are compatible with each other only if the types of their | |
1097 | fields are compatible (among other things). We assume that they | |
1098 | are compatible until proven otherwise when building the cache. | |
1099 | An example where this can occur is: | |
1100 | struct a | |
1101 | { | |
1102 | struct a *next; | |
1103 | }; | |
1104 | If we are comparing this against a similar struct in another TU, | |
c83eecad | 1105 | and did not assume they were compatible, we end up with an infinite |
f13c9b2c AP |
1106 | loop. */ |
1107 | tu->val = 1; | |
1108 | return tu; | |
1109 | } | |
d1bd0ded | 1110 | |
f13c9b2c | 1111 | /* Free the seen types until we get to TU_TIL. */ |
d1bd0ded | 1112 | |
f13c9b2c AP |
1113 | static void |
1114 | free_all_tagged_tu_seen_up_to (const struct tagged_tu_seen_cache *tu_til) | |
1115 | { | |
1116 | const struct tagged_tu_seen_cache *tu = tagged_tu_seen_base; | |
1117 | while (tu != tu_til) | |
1118 | { | |
741ac903 KG |
1119 | const struct tagged_tu_seen_cache *const tu1 |
1120 | = (const struct tagged_tu_seen_cache *) tu; | |
f13c9b2c | 1121 | tu = tu1->next; |
b1d5455a | 1122 | free (CONST_CAST (struct tagged_tu_seen_cache *, tu1)); |
f13c9b2c AP |
1123 | } |
1124 | tagged_tu_seen_base = tu_til; | |
1125 | } | |
d1bd0ded GK |
1126 | |
1127 | /* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are | |
1128 | compatible. If the two types are not the same (which has been | |
1129 | checked earlier), this can only happen when multiple translation | |
1130 | units are being compiled. See C99 6.2.7 paragraph 1 for the exact | |
1131 | rules. */ | |
1132 | ||
1133 | static int | |
58f9752a | 1134 | tagged_types_tu_compatible_p (const_tree t1, const_tree t2) |
d1bd0ded GK |
1135 | { |
1136 | tree s1, s2; | |
1137 | bool needs_warning = false; | |
3aeb3655 | 1138 | |
d1bd0ded GK |
1139 | /* We have to verify that the tags of the types are the same. This |
1140 | is harder than it looks because this may be a typedef, so we have | |
1141 | to go look at the original type. It may even be a typedef of a | |
6de9cd9a DN |
1142 | typedef... |
1143 | In the case of compiler-created builtin structs the TYPE_DECL | |
1144 | may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */ | |
dea984dc ILT |
1145 | while (TYPE_NAME (t1) |
1146 | && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL | |
1147 | && DECL_ORIGINAL_TYPE (TYPE_NAME (t1))) | |
d1bd0ded GK |
1148 | t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1)); |
1149 | ||
dea984dc ILT |
1150 | while (TYPE_NAME (t2) |
1151 | && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL | |
1152 | && DECL_ORIGINAL_TYPE (TYPE_NAME (t2))) | |
d1bd0ded GK |
1153 | t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2)); |
1154 | ||
1155 | /* C90 didn't have the requirement that the two tags be the same. */ | |
1156 | if (flag_isoc99 && TYPE_NAME (t1) != TYPE_NAME (t2)) | |
1157 | return 0; | |
3aeb3655 | 1158 | |
d1bd0ded GK |
1159 | /* C90 didn't say what happened if one or both of the types were |
1160 | incomplete; we choose to follow C99 rules here, which is that they | |
1161 | are compatible. */ | |
1162 | if (TYPE_SIZE (t1) == NULL | |
1163 | || TYPE_SIZE (t2) == NULL) | |
1164 | return 1; | |
3aeb3655 | 1165 | |
d1bd0ded | 1166 | { |
f13c9b2c | 1167 | const struct tagged_tu_seen_cache * tts_i; |
d1bd0ded GK |
1168 | for (tts_i = tagged_tu_seen_base; tts_i != NULL; tts_i = tts_i->next) |
1169 | if (tts_i->t1 == t1 && tts_i->t2 == t2) | |
f13c9b2c | 1170 | return tts_i->val; |
d1bd0ded | 1171 | } |
3aeb3655 | 1172 | |
d1bd0ded GK |
1173 | switch (TREE_CODE (t1)) |
1174 | { | |
1175 | case ENUMERAL_TYPE: | |
1176 | { | |
f13c9b2c | 1177 | struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2); |
c22cacf3 MS |
1178 | /* Speed up the case where the type values are in the same order. */ |
1179 | tree tv1 = TYPE_VALUES (t1); | |
1180 | tree tv2 = TYPE_VALUES (t2); | |
3aeb3655 | 1181 | |
c22cacf3 | 1182 | if (tv1 == tv2) |
f13c9b2c AP |
1183 | { |
1184 | return 1; | |
1185 | } | |
3aeb3655 | 1186 | |
c22cacf3 MS |
1187 | for (;tv1 && tv2; tv1 = TREE_CHAIN (tv1), tv2 = TREE_CHAIN (tv2)) |
1188 | { | |
1189 | if (TREE_PURPOSE (tv1) != TREE_PURPOSE (tv2)) | |
1190 | break; | |
1191 | if (simple_cst_equal (TREE_VALUE (tv1), TREE_VALUE (tv2)) != 1) | |
f13c9b2c | 1192 | { |
c22cacf3 | 1193 | tu->val = 0; |
f13c9b2c AP |
1194 | return 0; |
1195 | } | |
c22cacf3 | 1196 | } |
3aeb3655 | 1197 | |
c22cacf3 | 1198 | if (tv1 == NULL_TREE && tv2 == NULL_TREE) |
f13c9b2c AP |
1199 | { |
1200 | return 1; | |
1201 | } | |
c22cacf3 | 1202 | if (tv1 == NULL_TREE || tv2 == NULL_TREE) |
f13c9b2c AP |
1203 | { |
1204 | tu->val = 0; | |
1205 | return 0; | |
1206 | } | |
3aeb3655 | 1207 | |
d1bd0ded | 1208 | if (list_length (TYPE_VALUES (t1)) != list_length (TYPE_VALUES (t2))) |
f13c9b2c AP |
1209 | { |
1210 | tu->val = 0; | |
1211 | return 0; | |
1212 | } | |
3aeb3655 | 1213 | |
d1bd0ded GK |
1214 | for (s1 = TYPE_VALUES (t1); s1; s1 = TREE_CHAIN (s1)) |
1215 | { | |
1216 | s2 = purpose_member (TREE_PURPOSE (s1), TYPE_VALUES (t2)); | |
1217 | if (s2 == NULL | |
1218 | || simple_cst_equal (TREE_VALUE (s1), TREE_VALUE (s2)) != 1) | |
f13c9b2c AP |
1219 | { |
1220 | tu->val = 0; | |
1221 | return 0; | |
1222 | } | |
d1bd0ded GK |
1223 | } |
1224 | return 1; | |
1225 | } | |
1226 | ||
1227 | case UNION_TYPE: | |
1228 | { | |
f13c9b2c | 1229 | struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2); |
d1bd0ded | 1230 | if (list_length (TYPE_FIELDS (t1)) != list_length (TYPE_FIELDS (t2))) |
f13c9b2c AP |
1231 | { |
1232 | tu->val = 0; | |
1233 | return 0; | |
1234 | } | |
c22cacf3 | 1235 | |
f13c9b2c AP |
1236 | /* Speed up the common case where the fields are in the same order. */ |
1237 | for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2); s1 && s2; | |
1238 | s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2)) | |
1239 | { | |
1240 | int result; | |
c22cacf3 | 1241 | |
3ae4d3cc | 1242 | if (DECL_NAME (s1) != DECL_NAME (s2)) |
f13c9b2c AP |
1243 | break; |
1244 | result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2)); | |
3ae4d3cc AO |
1245 | |
1246 | if (result != 1 && !DECL_NAME (s1)) | |
1247 | break; | |
f13c9b2c AP |
1248 | if (result == 0) |
1249 | { | |
1250 | tu->val = 0; | |
1251 | return 0; | |
1252 | } | |
1253 | if (result == 2) | |
1254 | needs_warning = true; | |
1255 | ||
1256 | if (TREE_CODE (s1) == FIELD_DECL | |
1257 | && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1), | |
1258 | DECL_FIELD_BIT_OFFSET (s2)) != 1) | |
1259 | { | |
1260 | tu->val = 0; | |
1261 | return 0; | |
1262 | } | |
1263 | } | |
1264 | if (!s1 && !s2) | |
1265 | { | |
1266 | tu->val = needs_warning ? 2 : 1; | |
1267 | return tu->val; | |
1268 | } | |
d1bd0ded GK |
1269 | |
1270 | for (s1 = TYPE_FIELDS (t1); s1; s1 = TREE_CHAIN (s1)) | |
1271 | { | |
1272 | bool ok = false; | |
3aeb3655 | 1273 | |
3ae4d3cc AO |
1274 | for (s2 = TYPE_FIELDS (t2); s2; s2 = TREE_CHAIN (s2)) |
1275 | if (DECL_NAME (s1) == DECL_NAME (s2)) | |
1276 | { | |
1277 | int result; | |
1278 | ||
1279 | result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2)); | |
1280 | ||
1281 | if (result != 1 && !DECL_NAME (s1)) | |
1282 | continue; | |
1283 | if (result == 0) | |
1284 | { | |
1285 | tu->val = 0; | |
1286 | return 0; | |
1287 | } | |
1288 | if (result == 2) | |
1289 | needs_warning = true; | |
1290 | ||
1291 | if (TREE_CODE (s1) == FIELD_DECL | |
1292 | && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1), | |
1293 | DECL_FIELD_BIT_OFFSET (s2)) != 1) | |
d1bd0ded | 1294 | break; |
3ae4d3cc AO |
1295 | |
1296 | ok = true; | |
1297 | break; | |
1298 | } | |
3f75a254 | 1299 | if (!ok) |
f13c9b2c AP |
1300 | { |
1301 | tu->val = 0; | |
1302 | return 0; | |
1303 | } | |
d1bd0ded | 1304 | } |
f13c9b2c AP |
1305 | tu->val = needs_warning ? 2 : 10; |
1306 | return tu->val; | |
d1bd0ded GK |
1307 | } |
1308 | ||
1309 | case RECORD_TYPE: | |
1310 | { | |
c22cacf3 | 1311 | struct tagged_tu_seen_cache *tu = alloc_tagged_tu_seen_cache (t1, t2); |
3aeb3655 EC |
1312 | |
1313 | for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2); | |
d1bd0ded GK |
1314 | s1 && s2; |
1315 | s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2)) | |
1316 | { | |
1317 | int result; | |
1318 | if (TREE_CODE (s1) != TREE_CODE (s2) | |
1319 | || DECL_NAME (s1) != DECL_NAME (s2)) | |
1320 | break; | |
f13c9b2c | 1321 | result = comptypes_internal (TREE_TYPE (s1), TREE_TYPE (s2)); |
d1bd0ded GK |
1322 | if (result == 0) |
1323 | break; | |
1324 | if (result == 2) | |
1325 | needs_warning = true; | |
3aeb3655 | 1326 | |
d1bd0ded GK |
1327 | if (TREE_CODE (s1) == FIELD_DECL |
1328 | && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1), | |
1329 | DECL_FIELD_BIT_OFFSET (s2)) != 1) | |
1330 | break; | |
1331 | } | |
d1bd0ded | 1332 | if (s1 && s2) |
f13c9b2c AP |
1333 | tu->val = 0; |
1334 | else | |
1335 | tu->val = needs_warning ? 2 : 1; | |
1336 | return tu->val; | |
d1bd0ded GK |
1337 | } |
1338 | ||
1339 | default: | |
366de0ce | 1340 | gcc_unreachable (); |
d1bd0ded GK |
1341 | } |
1342 | } | |
1343 | ||
400fbf9f JW |
1344 | /* Return 1 if two function types F1 and F2 are compatible. |
1345 | If either type specifies no argument types, | |
1346 | the other must specify a fixed number of self-promoting arg types. | |
2f6e4e97 | 1347 | Otherwise, if one type specifies only the number of arguments, |
400fbf9f JW |
1348 | the other must specify that number of self-promoting arg types. |
1349 | Otherwise, the argument types must match. */ | |
1350 | ||
1351 | static int | |
58f9752a | 1352 | function_types_compatible_p (const_tree f1, const_tree f2) |
400fbf9f JW |
1353 | { |
1354 | tree args1, args2; | |
1355 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
1356 | int val = 1; | |
1357 | int val1; | |
a6fdc086 GK |
1358 | tree ret1, ret2; |
1359 | ||
1360 | ret1 = TREE_TYPE (f1); | |
1361 | ret2 = TREE_TYPE (f2); | |
1362 | ||
e508a019 JM |
1363 | /* 'volatile' qualifiers on a function's return type used to mean |
1364 | the function is noreturn. */ | |
1365 | if (TYPE_VOLATILE (ret1) != TYPE_VOLATILE (ret2)) | |
bda67431 | 1366 | pedwarn ("function return types not compatible due to %<volatile%>"); |
a6fdc086 GK |
1367 | if (TYPE_VOLATILE (ret1)) |
1368 | ret1 = build_qualified_type (TYPE_MAIN_VARIANT (ret1), | |
1369 | TYPE_QUALS (ret1) & ~TYPE_QUAL_VOLATILE); | |
1370 | if (TYPE_VOLATILE (ret2)) | |
1371 | ret2 = build_qualified_type (TYPE_MAIN_VARIANT (ret2), | |
1372 | TYPE_QUALS (ret2) & ~TYPE_QUAL_VOLATILE); | |
f13c9b2c | 1373 | val = comptypes_internal (ret1, ret2); |
a6fdc086 | 1374 | if (val == 0) |
400fbf9f JW |
1375 | return 0; |
1376 | ||
1377 | args1 = TYPE_ARG_TYPES (f1); | |
1378 | args2 = TYPE_ARG_TYPES (f2); | |
1379 | ||
1380 | /* An unspecified parmlist matches any specified parmlist | |
1381 | whose argument types don't need default promotions. */ | |
1382 | ||
1383 | if (args1 == 0) | |
1384 | { | |
1385 | if (!self_promoting_args_p (args2)) | |
1386 | return 0; | |
1387 | /* If one of these types comes from a non-prototype fn definition, | |
1388 | compare that with the other type's arglist. | |
3176a0c2 | 1389 | If they don't match, ask for a warning (but no error). */ |
400fbf9f | 1390 | if (TYPE_ACTUAL_ARG_TYPES (f1) |
132da1a5 | 1391 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) |
400fbf9f JW |
1392 | val = 2; |
1393 | return val; | |
1394 | } | |
1395 | if (args2 == 0) | |
1396 | { | |
1397 | if (!self_promoting_args_p (args1)) | |
1398 | return 0; | |
1399 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
132da1a5 | 1400 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) |
400fbf9f JW |
1401 | val = 2; |
1402 | return val; | |
1403 | } | |
1404 | ||
1405 | /* Both types have argument lists: compare them and propagate results. */ | |
132da1a5 | 1406 | val1 = type_lists_compatible_p (args1, args2); |
400fbf9f JW |
1407 | return val1 != 1 ? val1 : val; |
1408 | } | |
1409 | ||
1410 | /* Check two lists of types for compatibility, | |
1411 | returning 0 for incompatible, 1 for compatible, | |
1412 | or 2 for compatible with warning. */ | |
1413 | ||
1414 | static int | |
58f9752a | 1415 | type_lists_compatible_p (const_tree args1, const_tree args2) |
400fbf9f JW |
1416 | { |
1417 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
1418 | int val = 1; | |
9d5f3e49 | 1419 | int newval = 0; |
400fbf9f JW |
1420 | |
1421 | while (1) | |
1422 | { | |
46df2823 | 1423 | tree a1, mv1, a2, mv2; |
400fbf9f JW |
1424 | if (args1 == 0 && args2 == 0) |
1425 | return val; | |
1426 | /* If one list is shorter than the other, | |
1427 | they fail to match. */ | |
1428 | if (args1 == 0 || args2 == 0) | |
1429 | return 0; | |
46df2823 JM |
1430 | mv1 = a1 = TREE_VALUE (args1); |
1431 | mv2 = a2 = TREE_VALUE (args2); | |
1432 | if (mv1 && mv1 != error_mark_node && TREE_CODE (mv1) != ARRAY_TYPE) | |
1433 | mv1 = TYPE_MAIN_VARIANT (mv1); | |
1434 | if (mv2 && mv2 != error_mark_node && TREE_CODE (mv2) != ARRAY_TYPE) | |
1435 | mv2 = TYPE_MAIN_VARIANT (mv2); | |
400fbf9f JW |
1436 | /* A null pointer instead of a type |
1437 | means there is supposed to be an argument | |
1438 | but nothing is specified about what type it has. | |
1439 | So match anything that self-promotes. */ | |
46df2823 | 1440 | if (a1 == 0) |
400fbf9f | 1441 | { |
46df2823 | 1442 | if (c_type_promotes_to (a2) != a2) |
400fbf9f JW |
1443 | return 0; |
1444 | } | |
46df2823 | 1445 | else if (a2 == 0) |
400fbf9f | 1446 | { |
46df2823 | 1447 | if (c_type_promotes_to (a1) != a1) |
400fbf9f JW |
1448 | return 0; |
1449 | } | |
8f5b6d29 | 1450 | /* If one of the lists has an error marker, ignore this arg. */ |
46df2823 JM |
1451 | else if (TREE_CODE (a1) == ERROR_MARK |
1452 | || TREE_CODE (a2) == ERROR_MARK) | |
8f5b6d29 | 1453 | ; |
f13c9b2c | 1454 | else if (!(newval = comptypes_internal (mv1, mv2))) |
400fbf9f JW |
1455 | { |
1456 | /* Allow wait (union {union wait *u; int *i} *) | |
1457 | and wait (union wait *) to be compatible. */ | |
46df2823 JM |
1458 | if (TREE_CODE (a1) == UNION_TYPE |
1459 | && (TYPE_NAME (a1) == 0 | |
1460 | || TYPE_TRANSPARENT_UNION (a1)) | |
1461 | && TREE_CODE (TYPE_SIZE (a1)) == INTEGER_CST | |
1462 | && tree_int_cst_equal (TYPE_SIZE (a1), | |
1463 | TYPE_SIZE (a2))) | |
400fbf9f JW |
1464 | { |
1465 | tree memb; | |
46df2823 | 1466 | for (memb = TYPE_FIELDS (a1); |
400fbf9f | 1467 | memb; memb = TREE_CHAIN (memb)) |
58cb41e6 JJ |
1468 | { |
1469 | tree mv3 = TREE_TYPE (memb); | |
1470 | if (mv3 && mv3 != error_mark_node | |
1471 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
1472 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
f13c9b2c | 1473 | if (comptypes_internal (mv3, mv2)) |
58cb41e6 JJ |
1474 | break; |
1475 | } | |
400fbf9f JW |
1476 | if (memb == 0) |
1477 | return 0; | |
1478 | } | |
46df2823 JM |
1479 | else if (TREE_CODE (a2) == UNION_TYPE |
1480 | && (TYPE_NAME (a2) == 0 | |
1481 | || TYPE_TRANSPARENT_UNION (a2)) | |
1482 | && TREE_CODE (TYPE_SIZE (a2)) == INTEGER_CST | |
1483 | && tree_int_cst_equal (TYPE_SIZE (a2), | |
1484 | TYPE_SIZE (a1))) | |
400fbf9f JW |
1485 | { |
1486 | tree memb; | |
46df2823 | 1487 | for (memb = TYPE_FIELDS (a2); |
400fbf9f | 1488 | memb; memb = TREE_CHAIN (memb)) |
58cb41e6 JJ |
1489 | { |
1490 | tree mv3 = TREE_TYPE (memb); | |
1491 | if (mv3 && mv3 != error_mark_node | |
1492 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
1493 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
f13c9b2c | 1494 | if (comptypes_internal (mv3, mv1)) |
58cb41e6 JJ |
1495 | break; |
1496 | } | |
400fbf9f JW |
1497 | if (memb == 0) |
1498 | return 0; | |
1499 | } | |
1500 | else | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | /* comptypes said ok, but record if it said to warn. */ | |
1505 | if (newval > val) | |
1506 | val = newval; | |
1507 | ||
1508 | args1 = TREE_CHAIN (args1); | |
1509 | args2 = TREE_CHAIN (args2); | |
1510 | } | |
1511 | } | |
400fbf9f | 1512 | \f |
400fbf9f JW |
1513 | /* Compute the size to increment a pointer by. */ |
1514 | ||
4e2fb7de | 1515 | static tree |
58f9752a | 1516 | c_size_in_bytes (const_tree type) |
400fbf9f JW |
1517 | { |
1518 | enum tree_code code = TREE_CODE (type); | |
1519 | ||
fed3cef0 RK |
1520 | if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK) |
1521 | return size_one_node; | |
1522 | ||
d0f062fb | 1523 | if (!COMPLETE_OR_VOID_TYPE_P (type)) |
400fbf9f JW |
1524 | { |
1525 | error ("arithmetic on pointer to an incomplete type"); | |
fed3cef0 | 1526 | return size_one_node; |
400fbf9f JW |
1527 | } |
1528 | ||
1529 | /* Convert in case a char is more than one unit. */ | |
fed3cef0 RK |
1530 | return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), |
1531 | size_int (TYPE_PRECISION (char_type_node) | |
1532 | / BITS_PER_UNIT)); | |
400fbf9f | 1533 | } |
400fbf9f | 1534 | \f |
400fbf9f JW |
1535 | /* Return either DECL or its known constant value (if it has one). */ |
1536 | ||
56cb9733 | 1537 | tree |
2f6e4e97 | 1538 | decl_constant_value (tree decl) |
400fbf9f | 1539 | { |
a7c1916a | 1540 | if (/* Don't change a variable array bound or initial value to a constant |
4f976745 RK |
1541 | in a place where a variable is invalid. Note that DECL_INITIAL |
1542 | isn't valid for a PARM_DECL. */ | |
a7c1916a | 1543 | current_function_decl != 0 |
4f976745 | 1544 | && TREE_CODE (decl) != PARM_DECL |
3f75a254 | 1545 | && !TREE_THIS_VOLATILE (decl) |
83bab8db | 1546 | && TREE_READONLY (decl) |
400fbf9f JW |
1547 | && DECL_INITIAL (decl) != 0 |
1548 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
1549 | /* This is invalid if initial value is not constant. | |
1550 | If it has either a function call, a memory reference, | |
1551 | or a variable, then re-evaluating it could give different results. */ | |
1552 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
1553 | /* Check for cases where this is sub-optimal, even though valid. */ | |
2f74f7e9 | 1554 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR) |
400fbf9f JW |
1555 | return DECL_INITIAL (decl); |
1556 | return decl; | |
1557 | } | |
1558 | ||
2f74f7e9 JM |
1559 | /* Return either DECL or its known constant value (if it has one), but |
1560 | return DECL if pedantic or DECL has mode BLKmode. This is for | |
1561 | bug-compatibility with the old behavior of decl_constant_value | |
1562 | (before GCC 3.0); every use of this function is a bug and it should | |
1563 | be removed before GCC 3.1. It is not appropriate to use pedantic | |
1564 | in a way that affects optimization, and BLKmode is probably not the | |
1565 | right test for avoiding misoptimizations either. */ | |
1566 | ||
1567 | static tree | |
2f6e4e97 | 1568 | decl_constant_value_for_broken_optimization (tree decl) |
2f74f7e9 | 1569 | { |
c477e13b JJ |
1570 | tree ret; |
1571 | ||
2f74f7e9 JM |
1572 | if (pedantic || DECL_MODE (decl) == BLKmode) |
1573 | return decl; | |
c477e13b JJ |
1574 | |
1575 | ret = decl_constant_value (decl); | |
1576 | /* Avoid unwanted tree sharing between the initializer and current | |
1577 | function's body where the tree can be modified e.g. by the | |
1578 | gimplifier. */ | |
1579 | if (ret != decl && TREE_STATIC (decl)) | |
1580 | ret = unshare_expr (ret); | |
1581 | return ret; | |
2f74f7e9 JM |
1582 | } |
1583 | ||
f2a71bbc JM |
1584 | /* Convert the array expression EXP to a pointer. */ |
1585 | static tree | |
1586 | array_to_pointer_conversion (tree exp) | |
207bf485 | 1587 | { |
f2a71bbc | 1588 | tree orig_exp = exp; |
207bf485 | 1589 | tree type = TREE_TYPE (exp); |
f2a71bbc JM |
1590 | tree adr; |
1591 | tree restype = TREE_TYPE (type); | |
1592 | tree ptrtype; | |
207bf485 | 1593 | |
f2a71bbc | 1594 | gcc_assert (TREE_CODE (type) == ARRAY_TYPE); |
207bf485 | 1595 | |
f2a71bbc | 1596 | STRIP_TYPE_NOPS (exp); |
207bf485 | 1597 | |
487a92fe JM |
1598 | if (TREE_NO_WARNING (orig_exp)) |
1599 | TREE_NO_WARNING (exp) = 1; | |
207bf485 | 1600 | |
f2a71bbc JM |
1601 | ptrtype = build_pointer_type (restype); |
1602 | ||
1603 | if (TREE_CODE (exp) == INDIRECT_REF) | |
1604 | return convert (ptrtype, TREE_OPERAND (exp, 0)); | |
1605 | ||
1606 | if (TREE_CODE (exp) == VAR_DECL) | |
207bf485 | 1607 | { |
f2a71bbc JM |
1608 | /* We are making an ADDR_EXPR of ptrtype. This is a valid |
1609 | ADDR_EXPR because it's the best way of representing what | |
1610 | happens in C when we take the address of an array and place | |
1611 | it in a pointer to the element type. */ | |
1612 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1613 | if (!c_mark_addressable (exp)) | |
1614 | return error_mark_node; | |
1615 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1616 | return adr; | |
207bf485 | 1617 | } |
207bf485 | 1618 | |
f2a71bbc JM |
1619 | /* This way is better for a COMPONENT_REF since it can |
1620 | simplify the offset for a component. */ | |
1621 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1622 | return convert (ptrtype, adr); | |
1623 | } | |
207bf485 | 1624 | |
f2a71bbc JM |
1625 | /* Convert the function expression EXP to a pointer. */ |
1626 | static tree | |
1627 | function_to_pointer_conversion (tree exp) | |
1628 | { | |
1629 | tree orig_exp = exp; | |
207bf485 | 1630 | |
f2a71bbc | 1631 | gcc_assert (TREE_CODE (TREE_TYPE (exp)) == FUNCTION_TYPE); |
207bf485 | 1632 | |
f2a71bbc | 1633 | STRIP_TYPE_NOPS (exp); |
207bf485 | 1634 | |
f2a71bbc JM |
1635 | if (TREE_NO_WARNING (orig_exp)) |
1636 | TREE_NO_WARNING (exp) = 1; | |
207bf485 | 1637 | |
f2a71bbc JM |
1638 | return build_unary_op (ADDR_EXPR, exp, 0); |
1639 | } | |
207bf485 | 1640 | |
f2a71bbc JM |
1641 | /* Perform the default conversion of arrays and functions to pointers. |
1642 | Return the result of converting EXP. For any other expression, just | |
1643 | return EXP after removing NOPs. */ | |
1644 | ||
1645 | struct c_expr | |
1646 | default_function_array_conversion (struct c_expr exp) | |
1647 | { | |
1648 | tree orig_exp = exp.value; | |
1649 | tree type = TREE_TYPE (exp.value); | |
1650 | enum tree_code code = TREE_CODE (type); | |
1651 | ||
1652 | switch (code) | |
1653 | { | |
1654 | case ARRAY_TYPE: | |
1655 | { | |
1656 | bool not_lvalue = false; | |
1657 | bool lvalue_array_p; | |
1658 | ||
1659 | while ((TREE_CODE (exp.value) == NON_LVALUE_EXPR | |
1043771b | 1660 | || CONVERT_EXPR_P (exp.value)) |
f2a71bbc JM |
1661 | && TREE_TYPE (TREE_OPERAND (exp.value, 0)) == type) |
1662 | { | |
1663 | if (TREE_CODE (exp.value) == NON_LVALUE_EXPR) | |
1664 | not_lvalue = true; | |
1665 | exp.value = TREE_OPERAND (exp.value, 0); | |
1666 | } | |
1667 | ||
1668 | if (TREE_NO_WARNING (orig_exp)) | |
1669 | TREE_NO_WARNING (exp.value) = 1; | |
1670 | ||
1671 | lvalue_array_p = !not_lvalue && lvalue_p (exp.value); | |
1672 | if (!flag_isoc99 && !lvalue_array_p) | |
1673 | { | |
1674 | /* Before C99, non-lvalue arrays do not decay to pointers. | |
1675 | Normally, using such an array would be invalid; but it can | |
1676 | be used correctly inside sizeof or as a statement expression. | |
1677 | Thus, do not give an error here; an error will result later. */ | |
1678 | return exp; | |
1679 | } | |
1680 | ||
1681 | exp.value = array_to_pointer_conversion (exp.value); | |
1682 | } | |
1683 | break; | |
1684 | case FUNCTION_TYPE: | |
1685 | exp.value = function_to_pointer_conversion (exp.value); | |
1686 | break; | |
1687 | default: | |
1688 | STRIP_TYPE_NOPS (exp.value); | |
1689 | if (TREE_NO_WARNING (orig_exp)) | |
1690 | TREE_NO_WARNING (exp.value) = 1; | |
1691 | break; | |
207bf485 | 1692 | } |
f2a71bbc | 1693 | |
207bf485 JM |
1694 | return exp; |
1695 | } | |
1696 | ||
522ddfa2 JM |
1697 | |
1698 | /* EXP is an expression of integer type. Apply the integer promotions | |
1699 | to it and return the promoted value. */ | |
400fbf9f JW |
1700 | |
1701 | tree | |
522ddfa2 | 1702 | perform_integral_promotions (tree exp) |
400fbf9f | 1703 | { |
b3694847 SS |
1704 | tree type = TREE_TYPE (exp); |
1705 | enum tree_code code = TREE_CODE (type); | |
400fbf9f | 1706 | |
522ddfa2 | 1707 | gcc_assert (INTEGRAL_TYPE_P (type)); |
157689c6 | 1708 | |
400fbf9f JW |
1709 | /* Normally convert enums to int, |
1710 | but convert wide enums to something wider. */ | |
1711 | if (code == ENUMERAL_TYPE) | |
1712 | { | |
b0c48229 NB |
1713 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
1714 | TYPE_PRECISION (integer_type_node)), | |
1715 | ((TYPE_PRECISION (type) | |
1716 | >= TYPE_PRECISION (integer_type_node)) | |
8df83eae | 1717 | && TYPE_UNSIGNED (type))); |
05bccae2 | 1718 | |
400fbf9f JW |
1719 | return convert (type, exp); |
1720 | } | |
1721 | ||
522ddfa2 JM |
1722 | /* ??? This should no longer be needed now bit-fields have their |
1723 | proper types. */ | |
9753f113 | 1724 | if (TREE_CODE (exp) == COMPONENT_REF |
05bccae2 | 1725 | && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1)) |
cff9c407 | 1726 | /* If it's thinner than an int, promote it like a |
d72040f5 | 1727 | c_promoting_integer_type_p, otherwise leave it alone. */ |
05bccae2 RK |
1728 | && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)), |
1729 | TYPE_PRECISION (integer_type_node))) | |
f458d1d5 | 1730 | return convert (integer_type_node, exp); |
9753f113 | 1731 | |
d72040f5 | 1732 | if (c_promoting_integer_type_p (type)) |
400fbf9f | 1733 | { |
f458d1d5 | 1734 | /* Preserve unsignedness if not really getting any wider. */ |
8df83eae | 1735 | if (TYPE_UNSIGNED (type) |
f458d1d5 | 1736 | && TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) |
400fbf9f | 1737 | return convert (unsigned_type_node, exp); |
05bccae2 | 1738 | |
400fbf9f JW |
1739 | return convert (integer_type_node, exp); |
1740 | } | |
05bccae2 | 1741 | |
522ddfa2 JM |
1742 | return exp; |
1743 | } | |
1744 | ||
1745 | ||
1746 | /* Perform default promotions for C data used in expressions. | |
46bdb9cf | 1747 | Enumeral types or short or char are converted to int. |
522ddfa2 JM |
1748 | In addition, manifest constants symbols are replaced by their values. */ |
1749 | ||
1750 | tree | |
1751 | default_conversion (tree exp) | |
1752 | { | |
1753 | tree orig_exp; | |
1754 | tree type = TREE_TYPE (exp); | |
1755 | enum tree_code code = TREE_CODE (type); | |
1756 | ||
46bdb9cf JM |
1757 | /* Functions and arrays have been converted during parsing. */ |
1758 | gcc_assert (code != FUNCTION_TYPE); | |
1759 | if (code == ARRAY_TYPE) | |
1760 | return exp; | |
522ddfa2 JM |
1761 | |
1762 | /* Constants can be used directly unless they're not loadable. */ | |
1763 | if (TREE_CODE (exp) == CONST_DECL) | |
1764 | exp = DECL_INITIAL (exp); | |
1765 | ||
1766 | /* Replace a nonvolatile const static variable with its value unless | |
1767 | it is an array, in which case we must be sure that taking the | |
1768 | address of the array produces consistent results. */ | |
1769 | else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE) | |
1770 | { | |
1771 | exp = decl_constant_value_for_broken_optimization (exp); | |
1772 | type = TREE_TYPE (exp); | |
1773 | } | |
1774 | ||
1775 | /* Strip no-op conversions. */ | |
1776 | orig_exp = exp; | |
1777 | STRIP_TYPE_NOPS (exp); | |
1778 | ||
1779 | if (TREE_NO_WARNING (orig_exp)) | |
1780 | TREE_NO_WARNING (exp) = 1; | |
1781 | ||
400fbf9f JW |
1782 | if (code == VOID_TYPE) |
1783 | { | |
1784 | error ("void value not ignored as it ought to be"); | |
1785 | return error_mark_node; | |
1786 | } | |
808d6eaa JM |
1787 | |
1788 | exp = require_complete_type (exp); | |
1789 | if (exp == error_mark_node) | |
1790 | return error_mark_node; | |
1791 | ||
1792 | if (INTEGRAL_TYPE_P (type)) | |
1793 | return perform_integral_promotions (exp); | |
1794 | ||
400fbf9f JW |
1795 | return exp; |
1796 | } | |
1797 | \f | |
e9b2c823 NB |
1798 | /* Look up COMPONENT in a structure or union DECL. |
1799 | ||
1800 | If the component name is not found, returns NULL_TREE. Otherwise, | |
1801 | the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL | |
1802 | stepping down the chain to the component, which is in the last | |
1803 | TREE_VALUE of the list. Normally the list is of length one, but if | |
1804 | the component is embedded within (nested) anonymous structures or | |
1805 | unions, the list steps down the chain to the component. */ | |
2f6e4e97 | 1806 | |
2f2d13da | 1807 | static tree |
2f6e4e97 | 1808 | lookup_field (tree decl, tree component) |
2f2d13da | 1809 | { |
e9b2c823 | 1810 | tree type = TREE_TYPE (decl); |
2f2d13da DE |
1811 | tree field; |
1812 | ||
1813 | /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1814 | to the field elements. Use a binary search on this array to quickly | |
1815 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1816 | will always be set for structures which have many elements. */ | |
1817 | ||
22a0b85f | 1818 | if (TYPE_LANG_SPECIFIC (type) && TYPE_LANG_SPECIFIC (type)->s) |
2f2d13da DE |
1819 | { |
1820 | int bot, top, half; | |
d07605f5 | 1821 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->s->elts[0]; |
2f2d13da DE |
1822 | |
1823 | field = TYPE_FIELDS (type); | |
1824 | bot = 0; | |
d07605f5 | 1825 | top = TYPE_LANG_SPECIFIC (type)->s->len; |
2f2d13da DE |
1826 | while (top - bot > 1) |
1827 | { | |
2f2d13da DE |
1828 | half = (top - bot + 1) >> 1; |
1829 | field = field_array[bot+half]; | |
1830 | ||
1831 | if (DECL_NAME (field) == NULL_TREE) | |
1832 | { | |
1833 | /* Step through all anon unions in linear fashion. */ | |
1834 | while (DECL_NAME (field_array[bot]) == NULL_TREE) | |
1835 | { | |
2f2d13da | 1836 | field = field_array[bot++]; |
a68b98cf RK |
1837 | if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
1838 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
19d76e60 | 1839 | { |
e9b2c823 NB |
1840 | tree anon = lookup_field (field, component); |
1841 | ||
1842 | if (anon) | |
1843 | return tree_cons (NULL_TREE, field, anon); | |
2f6e4e97 | 1844 | } |
2f2d13da DE |
1845 | } |
1846 | ||
1847 | /* Entire record is only anon unions. */ | |
1848 | if (bot > top) | |
1849 | return NULL_TREE; | |
1850 | ||
1851 | /* Restart the binary search, with new lower bound. */ | |
1852 | continue; | |
1853 | } | |
1854 | ||
e8b87aac | 1855 | if (DECL_NAME (field) == component) |
2f2d13da | 1856 | break; |
e8b87aac | 1857 | if (DECL_NAME (field) < component) |
2f2d13da DE |
1858 | bot += half; |
1859 | else | |
1860 | top = bot + half; | |
1861 | } | |
1862 | ||
1863 | if (DECL_NAME (field_array[bot]) == component) | |
1864 | field = field_array[bot]; | |
1865 | else if (DECL_NAME (field) != component) | |
e9b2c823 | 1866 | return NULL_TREE; |
2f2d13da DE |
1867 | } |
1868 | else | |
1869 | { | |
1870 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1871 | { | |
e9b2c823 NB |
1872 | if (DECL_NAME (field) == NULL_TREE |
1873 | && (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
1874 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)) | |
2f2d13da | 1875 | { |
e9b2c823 | 1876 | tree anon = lookup_field (field, component); |
a68b98cf | 1877 | |
e9b2c823 NB |
1878 | if (anon) |
1879 | return tree_cons (NULL_TREE, field, anon); | |
2f2d13da DE |
1880 | } |
1881 | ||
1882 | if (DECL_NAME (field) == component) | |
1883 | break; | |
1884 | } | |
e9b2c823 NB |
1885 | |
1886 | if (field == NULL_TREE) | |
1887 | return NULL_TREE; | |
2f2d13da DE |
1888 | } |
1889 | ||
e9b2c823 | 1890 | return tree_cons (NULL_TREE, field, NULL_TREE); |
2f2d13da DE |
1891 | } |
1892 | ||
400fbf9f JW |
1893 | /* Make an expression to refer to the COMPONENT field of |
1894 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1895 | ||
1896 | tree | |
2f6e4e97 | 1897 | build_component_ref (tree datum, tree component) |
400fbf9f | 1898 | { |
b3694847 SS |
1899 | tree type = TREE_TYPE (datum); |
1900 | enum tree_code code = TREE_CODE (type); | |
1901 | tree field = NULL; | |
1902 | tree ref; | |
400fbf9f | 1903 | |
7a3ea201 RH |
1904 | if (!objc_is_public (datum, component)) |
1905 | return error_mark_node; | |
1906 | ||
400fbf9f JW |
1907 | /* See if there is a field or component with name COMPONENT. */ |
1908 | ||
1909 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1910 | { | |
d0f062fb | 1911 | if (!COMPLETE_TYPE_P (type)) |
400fbf9f | 1912 | { |
7a228918 | 1913 | c_incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1914 | return error_mark_node; |
1915 | } | |
1916 | ||
e9b2c823 | 1917 | field = lookup_field (datum, component); |
400fbf9f JW |
1918 | |
1919 | if (!field) | |
1920 | { | |
c51a1ba9 | 1921 | error ("%qT has no member named %qE", type, component); |
400fbf9f JW |
1922 | return error_mark_node; |
1923 | } | |
400fbf9f | 1924 | |
e9b2c823 NB |
1925 | /* Chain the COMPONENT_REFs if necessary down to the FIELD. |
1926 | This might be better solved in future the way the C++ front | |
1927 | end does it - by giving the anonymous entities each a | |
1928 | separate name and type, and then have build_component_ref | |
1929 | recursively call itself. We can't do that here. */ | |
46ea50cb | 1930 | do |
19d76e60 | 1931 | { |
e9b2c823 | 1932 | tree subdatum = TREE_VALUE (field); |
efed193e JM |
1933 | int quals; |
1934 | tree subtype; | |
e9b2c823 NB |
1935 | |
1936 | if (TREE_TYPE (subdatum) == error_mark_node) | |
1937 | return error_mark_node; | |
1938 | ||
efed193e JM |
1939 | quals = TYPE_QUALS (strip_array_types (TREE_TYPE (subdatum))); |
1940 | quals |= TYPE_QUALS (TREE_TYPE (datum)); | |
1941 | subtype = c_build_qualified_type (TREE_TYPE (subdatum), quals); | |
1942 | ||
1943 | ref = build3 (COMPONENT_REF, subtype, datum, subdatum, | |
53fb4de3 | 1944 | NULL_TREE); |
e9b2c823 | 1945 | if (TREE_READONLY (datum) || TREE_READONLY (subdatum)) |
19d76e60 | 1946 | TREE_READONLY (ref) = 1; |
e9b2c823 | 1947 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (subdatum)) |
19d76e60 | 1948 | TREE_THIS_VOLATILE (ref) = 1; |
e23bd218 IR |
1949 | |
1950 | if (TREE_DEPRECATED (subdatum)) | |
1951 | warn_deprecated_use (subdatum); | |
1952 | ||
19d76e60 | 1953 | datum = ref; |
46ea50cb RS |
1954 | |
1955 | field = TREE_CHAIN (field); | |
19d76e60 | 1956 | } |
46ea50cb | 1957 | while (field); |
19d76e60 | 1958 | |
400fbf9f JW |
1959 | return ref; |
1960 | } | |
1961 | else if (code != ERROR_MARK) | |
c51a1ba9 JM |
1962 | error ("request for member %qE in something not a structure or union", |
1963 | component); | |
400fbf9f JW |
1964 | |
1965 | return error_mark_node; | |
1966 | } | |
1967 | \f | |
1968 | /* Given an expression PTR for a pointer, return an expression | |
1969 | for the value pointed to. | |
1970 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1971 | ||
1972 | tree | |
2f6e4e97 | 1973 | build_indirect_ref (tree ptr, const char *errorstring) |
400fbf9f | 1974 | { |
b3694847 SS |
1975 | tree pointer = default_conversion (ptr); |
1976 | tree type = TREE_TYPE (pointer); | |
400fbf9f JW |
1977 | |
1978 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b | 1979 | { |
1043771b | 1980 | if (CONVERT_EXPR_P (pointer) |
79bedddc SR |
1981 | || TREE_CODE (pointer) == VIEW_CONVERT_EXPR) |
1982 | { | |
1983 | /* If a warning is issued, mark it to avoid duplicates from | |
1984 | the backend. This only needs to be done at | |
1985 | warn_strict_aliasing > 2. */ | |
1986 | if (warn_strict_aliasing > 2) | |
1987 | if (strict_aliasing_warning (TREE_TYPE (TREE_OPERAND (pointer, 0)), | |
1988 | type, TREE_OPERAND (pointer, 0))) | |
1989 | TREE_NO_WARNING (pointer) = 1; | |
1990 | } | |
1991 | ||
870cc33b | 1992 | if (TREE_CODE (pointer) == ADDR_EXPR |
870cc33b RS |
1993 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) |
1994 | == TREE_TYPE (type))) | |
1995 | return TREE_OPERAND (pointer, 0); | |
1996 | else | |
1997 | { | |
1998 | tree t = TREE_TYPE (type); | |
46df2823 JM |
1999 | tree ref; |
2000 | ||
984dfd8c | 2001 | ref = build1 (INDIRECT_REF, t, pointer); |
400fbf9f | 2002 | |
baae9b65 | 2003 | if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE) |
870cc33b RS |
2004 | { |
2005 | error ("dereferencing pointer to incomplete type"); | |
2006 | return error_mark_node; | |
2007 | } | |
baae9b65 | 2008 | if (VOID_TYPE_P (t) && skip_evaluation == 0) |
d4ee4d25 | 2009 | warning (0, "dereferencing %<void *%> pointer"); |
870cc33b RS |
2010 | |
2011 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
2012 | so that we get the proper error message if the result is used | |
2013 | to assign to. Also, &* is supposed to be a no-op. | |
2014 | And ANSI C seems to specify that the type of the result | |
2015 | should be the const type. */ | |
2016 | /* A de-reference of a pointer to const is not a const. It is valid | |
2017 | to change it via some other pointer. */ | |
2018 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
2019 | TREE_SIDE_EFFECTS (ref) | |
271bd540 | 2020 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); |
493692cd | 2021 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); |
870cc33b RS |
2022 | return ref; |
2023 | } | |
2024 | } | |
400fbf9f | 2025 | else if (TREE_CODE (pointer) != ERROR_MARK) |
2c751309 | 2026 | error ("invalid type argument of %qs (have %qT)", errorstring, type); |
400fbf9f JW |
2027 | return error_mark_node; |
2028 | } | |
2029 | ||
2030 | /* This handles expressions of the form "a[i]", which denotes | |
2031 | an array reference. | |
2032 | ||
2033 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
2034 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
2035 | This avoids forcing the array out of registers, and can work on | |
2036 | arrays that are not lvalues (for example, members of structures returned | |
2037 | by functions). */ | |
2038 | ||
2039 | tree | |
2f6e4e97 | 2040 | build_array_ref (tree array, tree index) |
400fbf9f | 2041 | { |
a4ab7973 | 2042 | bool swapped = false; |
400fbf9f JW |
2043 | if (TREE_TYPE (array) == error_mark_node |
2044 | || TREE_TYPE (index) == error_mark_node) | |
2045 | return error_mark_node; | |
2046 | ||
a4ab7973 JM |
2047 | if (TREE_CODE (TREE_TYPE (array)) != ARRAY_TYPE |
2048 | && TREE_CODE (TREE_TYPE (array)) != POINTER_TYPE) | |
400fbf9f | 2049 | { |
a4ab7973 JM |
2050 | tree temp; |
2051 | if (TREE_CODE (TREE_TYPE (index)) != ARRAY_TYPE | |
2052 | && TREE_CODE (TREE_TYPE (index)) != POINTER_TYPE) | |
fdeefd49 | 2053 | { |
a4ab7973 | 2054 | error ("subscripted value is neither array nor pointer"); |
fdeefd49 RS |
2055 | return error_mark_node; |
2056 | } | |
a4ab7973 JM |
2057 | temp = array; |
2058 | array = index; | |
2059 | index = temp; | |
2060 | swapped = true; | |
2061 | } | |
2062 | ||
2063 | if (!INTEGRAL_TYPE_P (TREE_TYPE (index))) | |
2064 | { | |
2065 | error ("array subscript is not an integer"); | |
2066 | return error_mark_node; | |
2067 | } | |
2068 | ||
2069 | if (TREE_CODE (TREE_TYPE (TREE_TYPE (array))) == FUNCTION_TYPE) | |
2070 | { | |
2071 | error ("subscripted value is pointer to function"); | |
2072 | return error_mark_node; | |
2073 | } | |
2074 | ||
ff6b6641 GDR |
2075 | /* ??? Existing practice has been to warn only when the char |
2076 | index is syntactically the index, not for char[array]. */ | |
2077 | if (!swapped) | |
2078 | warn_array_subscript_with_type_char (index); | |
a4ab7973 JM |
2079 | |
2080 | /* Apply default promotions *after* noticing character types. */ | |
2081 | index = default_conversion (index); | |
2082 | ||
2083 | gcc_assert (TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE); | |
2084 | ||
2085 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE) | |
2086 | { | |
e4d35515 | 2087 | tree rval, type; |
fdeefd49 | 2088 | |
400fbf9f JW |
2089 | /* An array that is indexed by a non-constant |
2090 | cannot be stored in a register; we must be able to do | |
2091 | address arithmetic on its address. | |
2092 | Likewise an array of elements of variable size. */ | |
2093 | if (TREE_CODE (index) != INTEGER_CST | |
d0f062fb | 2094 | || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array))) |
400fbf9f JW |
2095 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) |
2096 | { | |
dffd7eb6 | 2097 | if (!c_mark_addressable (array)) |
400fbf9f JW |
2098 | return error_mark_node; |
2099 | } | |
e6d52559 JW |
2100 | /* An array that is indexed by a constant value which is not within |
2101 | the array bounds cannot be stored in a register either; because we | |
2102 | would get a crash in store_bit_field/extract_bit_field when trying | |
2103 | to access a non-existent part of the register. */ | |
2104 | if (TREE_CODE (index) == INTEGER_CST | |
eb34af89 | 2105 | && TYPE_DOMAIN (TREE_TYPE (array)) |
3f75a254 | 2106 | && !int_fits_type_p (index, TYPE_DOMAIN (TREE_TYPE (array)))) |
e6d52559 | 2107 | { |
dffd7eb6 | 2108 | if (!c_mark_addressable (array)) |
e6d52559 JW |
2109 | return error_mark_node; |
2110 | } | |
400fbf9f | 2111 | |
400fbf9f JW |
2112 | if (pedantic) |
2113 | { | |
2114 | tree foo = array; | |
2115 | while (TREE_CODE (foo) == COMPONENT_REF) | |
2116 | foo = TREE_OPERAND (foo, 0); | |
5baeaac0 | 2117 | if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo)) |
bda67431 | 2118 | pedwarn ("ISO C forbids subscripting %<register%> array"); |
3f75a254 | 2119 | else if (!flag_isoc99 && !lvalue_p (foo)) |
56508306 | 2120 | pedwarn ("ISO C90 forbids subscripting non-lvalue array"); |
400fbf9f JW |
2121 | } |
2122 | ||
46df2823 | 2123 | type = TREE_TYPE (TREE_TYPE (array)); |
53fb4de3 | 2124 | rval = build4 (ARRAY_REF, type, array, index, NULL_TREE, NULL_TREE); |
400fbf9f | 2125 | /* Array ref is const/volatile if the array elements are |
c22cacf3 | 2126 | or if the array is. */ |
400fbf9f JW |
2127 | TREE_READONLY (rval) |
2128 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
2129 | | TREE_READONLY (array)); | |
2130 | TREE_SIDE_EFFECTS (rval) | |
2131 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2132 | | TREE_SIDE_EFFECTS (array)); | |
2133 | TREE_THIS_VOLATILE (rval) | |
2134 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2135 | /* This was added by rms on 16 Nov 91. | |
2f6e4e97 | 2136 | It fixes vol struct foo *a; a->elts[1] |
400fbf9f JW |
2137 | in an inline function. |
2138 | Hope it doesn't break something else. */ | |
2139 | | TREE_THIS_VOLATILE (array)); | |
e4d35515 | 2140 | return require_complete_type (fold (rval)); |
400fbf9f | 2141 | } |
a4ab7973 JM |
2142 | else |
2143 | { | |
2144 | tree ar = default_conversion (array); | |
400fbf9f | 2145 | |
a4ab7973 JM |
2146 | if (ar == error_mark_node) |
2147 | return ar; | |
400fbf9f | 2148 | |
a4ab7973 JM |
2149 | gcc_assert (TREE_CODE (TREE_TYPE (ar)) == POINTER_TYPE); |
2150 | gcc_assert (TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) != FUNCTION_TYPE); | |
400fbf9f | 2151 | |
a4ab7973 JM |
2152 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, index, 0), |
2153 | "array indexing"); | |
2154 | } | |
400fbf9f JW |
2155 | } |
2156 | \f | |
7e585d16 | 2157 | /* Build an external reference to identifier ID. FUN indicates |
766beb40 JM |
2158 | whether this will be used for a function call. LOC is the source |
2159 | location of the identifier. */ | |
7e585d16 | 2160 | tree |
766beb40 | 2161 | build_external_ref (tree id, int fun, location_t loc) |
7e585d16 ZW |
2162 | { |
2163 | tree ref; | |
2164 | tree decl = lookup_name (id); | |
16b34ad6 ZL |
2165 | |
2166 | /* In Objective-C, an instance variable (ivar) may be preferred to | |
2167 | whatever lookup_name() found. */ | |
2168 | decl = objc_lookup_ivar (decl, id); | |
7e585d16 | 2169 | |
339a28b9 | 2170 | if (decl && decl != error_mark_node) |
16b34ad6 | 2171 | ref = decl; |
339a28b9 ZW |
2172 | else if (fun) |
2173 | /* Implicit function declaration. */ | |
2174 | ref = implicitly_declare (id); | |
2175 | else if (decl == error_mark_node) | |
2176 | /* Don't complain about something that's already been | |
2177 | complained about. */ | |
2178 | return error_mark_node; | |
2179 | else | |
2180 | { | |
766beb40 | 2181 | undeclared_variable (id, loc); |
339a28b9 ZW |
2182 | return error_mark_node; |
2183 | } | |
7e585d16 ZW |
2184 | |
2185 | if (TREE_TYPE (ref) == error_mark_node) | |
2186 | return error_mark_node; | |
2187 | ||
339a28b9 ZW |
2188 | if (TREE_DEPRECATED (ref)) |
2189 | warn_deprecated_use (ref); | |
2190 | ||
ad960f56 MLI |
2191 | /* Recursive call does not count as usage. */ |
2192 | if (ref != current_function_decl) | |
2193 | { | |
2194 | if (!skip_evaluation) | |
2195 | assemble_external (ref); | |
2196 | TREE_USED (ref) = 1; | |
2197 | } | |
7e585d16 | 2198 | |
bc4b653b JM |
2199 | if (TREE_CODE (ref) == FUNCTION_DECL && !in_alignof) |
2200 | { | |
2201 | if (!in_sizeof && !in_typeof) | |
2202 | C_DECL_USED (ref) = 1; | |
2203 | else if (DECL_INITIAL (ref) == 0 | |
2204 | && DECL_EXTERNAL (ref) | |
2205 | && !TREE_PUBLIC (ref)) | |
2206 | record_maybe_used_decl (ref); | |
2207 | } | |
2208 | ||
7e585d16 ZW |
2209 | if (TREE_CODE (ref) == CONST_DECL) |
2210 | { | |
6193b8b7 | 2211 | used_types_insert (TREE_TYPE (ref)); |
7e585d16 ZW |
2212 | ref = DECL_INITIAL (ref); |
2213 | TREE_CONSTANT (ref) = 1; | |
2214 | } | |
6a29edea | 2215 | else if (current_function_decl != 0 |
4b1e44be | 2216 | && !DECL_FILE_SCOPE_P (current_function_decl) |
6a29edea EB |
2217 | && (TREE_CODE (ref) == VAR_DECL |
2218 | || TREE_CODE (ref) == PARM_DECL | |
2219 | || TREE_CODE (ref) == FUNCTION_DECL)) | |
2220 | { | |
2221 | tree context = decl_function_context (ref); | |
2f6e4e97 | 2222 | |
6a29edea EB |
2223 | if (context != 0 && context != current_function_decl) |
2224 | DECL_NONLOCAL (ref) = 1; | |
2225 | } | |
71113fcd GK |
2226 | /* C99 6.7.4p3: An inline definition of a function with external |
2227 | linkage ... shall not contain a reference to an identifier with | |
2228 | internal linkage. */ | |
2229 | else if (current_function_decl != 0 | |
2230 | && DECL_DECLARED_INLINE_P (current_function_decl) | |
2231 | && DECL_EXTERNAL (current_function_decl) | |
2232 | && VAR_OR_FUNCTION_DECL_P (ref) | |
2233 | && (TREE_CODE (ref) != VAR_DECL || TREE_STATIC (ref)) | |
1033ffa8 JJ |
2234 | && ! TREE_PUBLIC (ref) |
2235 | && DECL_CONTEXT (ref) != current_function_decl) | |
71113fcd GK |
2236 | pedwarn ("%H%qD is static but used in inline function %qD " |
2237 | "which is not static", &loc, ref, current_function_decl); | |
7e585d16 ZW |
2238 | |
2239 | return ref; | |
2240 | } | |
2241 | ||
bc4b653b JM |
2242 | /* Record details of decls possibly used inside sizeof or typeof. */ |
2243 | struct maybe_used_decl | |
2244 | { | |
2245 | /* The decl. */ | |
2246 | tree decl; | |
2247 | /* The level seen at (in_sizeof + in_typeof). */ | |
2248 | int level; | |
2249 | /* The next one at this level or above, or NULL. */ | |
2250 | struct maybe_used_decl *next; | |
2251 | }; | |
2252 | ||
2253 | static struct maybe_used_decl *maybe_used_decls; | |
2254 | ||
2255 | /* Record that DECL, an undefined static function reference seen | |
2256 | inside sizeof or typeof, might be used if the operand of sizeof is | |
2257 | a VLA type or the operand of typeof is a variably modified | |
2258 | type. */ | |
2259 | ||
4e2fb7de | 2260 | static void |
bc4b653b JM |
2261 | record_maybe_used_decl (tree decl) |
2262 | { | |
2263 | struct maybe_used_decl *t = XOBNEW (&parser_obstack, struct maybe_used_decl); | |
2264 | t->decl = decl; | |
2265 | t->level = in_sizeof + in_typeof; | |
2266 | t->next = maybe_used_decls; | |
2267 | maybe_used_decls = t; | |
2268 | } | |
2269 | ||
2270 | /* Pop the stack of decls possibly used inside sizeof or typeof. If | |
2271 | USED is false, just discard them. If it is true, mark them used | |
2272 | (if no longer inside sizeof or typeof) or move them to the next | |
2273 | level up (if still inside sizeof or typeof). */ | |
2274 | ||
2275 | void | |
2276 | pop_maybe_used (bool used) | |
2277 | { | |
2278 | struct maybe_used_decl *p = maybe_used_decls; | |
2279 | int cur_level = in_sizeof + in_typeof; | |
2280 | while (p && p->level > cur_level) | |
2281 | { | |
2282 | if (used) | |
2283 | { | |
2284 | if (cur_level == 0) | |
2285 | C_DECL_USED (p->decl) = 1; | |
2286 | else | |
2287 | p->level = cur_level; | |
2288 | } | |
2289 | p = p->next; | |
2290 | } | |
2291 | if (!used || cur_level == 0) | |
2292 | maybe_used_decls = p; | |
2293 | } | |
2294 | ||
2295 | /* Return the result of sizeof applied to EXPR. */ | |
2296 | ||
2297 | struct c_expr | |
2298 | c_expr_sizeof_expr (struct c_expr expr) | |
2299 | { | |
2300 | struct c_expr ret; | |
ad97f4be JM |
2301 | if (expr.value == error_mark_node) |
2302 | { | |
2303 | ret.value = error_mark_node; | |
2304 | ret.original_code = ERROR_MARK; | |
2305 | pop_maybe_used (false); | |
2306 | } | |
2307 | else | |
2308 | { | |
2309 | ret.value = c_sizeof (TREE_TYPE (expr.value)); | |
2310 | ret.original_code = ERROR_MARK; | |
52ffd86e MS |
2311 | if (c_vla_type_p (TREE_TYPE (expr.value))) |
2312 | { | |
2313 | /* sizeof is evaluated when given a vla (C99 6.5.3.4p2). */ | |
2314 | ret.value = build2 (COMPOUND_EXPR, TREE_TYPE (ret.value), expr.value, ret.value); | |
2315 | } | |
ad97f4be JM |
2316 | pop_maybe_used (C_TYPE_VARIABLE_SIZE (TREE_TYPE (expr.value))); |
2317 | } | |
bc4b653b JM |
2318 | return ret; |
2319 | } | |
2320 | ||
2321 | /* Return the result of sizeof applied to T, a structure for the type | |
2322 | name passed to sizeof (rather than the type itself). */ | |
2323 | ||
2324 | struct c_expr | |
f8893e47 | 2325 | c_expr_sizeof_type (struct c_type_name *t) |
bc4b653b JM |
2326 | { |
2327 | tree type; | |
2328 | struct c_expr ret; | |
2329 | type = groktypename (t); | |
2330 | ret.value = c_sizeof (type); | |
2331 | ret.original_code = ERROR_MARK; | |
16464cc1 VR |
2332 | pop_maybe_used (type != error_mark_node |
2333 | ? C_TYPE_VARIABLE_SIZE (type) : false); | |
bc4b653b JM |
2334 | return ret; |
2335 | } | |
2336 | ||
400fbf9f JW |
2337 | /* Build a function call to function FUNCTION with parameters PARAMS. |
2338 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
2339 | TREE_VALUE of each node is a parameter-expression. | |
2340 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
2341 | ||
2342 | tree | |
2f6e4e97 | 2343 | build_function_call (tree function, tree params) |
400fbf9f | 2344 | { |
b3694847 | 2345 | tree fntype, fundecl = 0; |
4977bab6 | 2346 | tree name = NULL_TREE, result; |
c96f4f73 | 2347 | tree tem; |
94a0dd7b SL |
2348 | int nargs; |
2349 | tree *argarray; | |
2350 | ||
400fbf9f | 2351 | |
fc76e425 | 2352 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 2353 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
2354 | |
2355 | /* Convert anything with function type to a pointer-to-function. */ | |
2356 | if (TREE_CODE (function) == FUNCTION_DECL) | |
2357 | { | |
58646b77 PB |
2358 | /* Implement type-directed function overloading for builtins. |
2359 | resolve_overloaded_builtin and targetm.resolve_overloaded_builtin | |
2360 | handle all the type checking. The result is a complete expression | |
2361 | that implements this function call. */ | |
2362 | tem = resolve_overloaded_builtin (function, params); | |
2363 | if (tem) | |
2364 | return tem; | |
48ae6c13 | 2365 | |
400fbf9f | 2366 | name = DECL_NAME (function); |
a5eadacc | 2367 | fundecl = function; |
400fbf9f | 2368 | } |
f2a71bbc JM |
2369 | if (TREE_CODE (TREE_TYPE (function)) == FUNCTION_TYPE) |
2370 | function = function_to_pointer_conversion (function); | |
400fbf9f | 2371 | |
6e955430 ZL |
2372 | /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF |
2373 | expressions, like those used for ObjC messenger dispatches. */ | |
2374 | function = objc_rewrite_function_call (function, params); | |
2375 | ||
400fbf9f JW |
2376 | fntype = TREE_TYPE (function); |
2377 | ||
2378 | if (TREE_CODE (fntype) == ERROR_MARK) | |
2379 | return error_mark_node; | |
2380 | ||
2381 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
2382 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
2383 | { | |
f0c721ad | 2384 | error ("called object %qE is not a function", function); |
400fbf9f JW |
2385 | return error_mark_node; |
2386 | } | |
2387 | ||
5ce89b2e JM |
2388 | if (fundecl && TREE_THIS_VOLATILE (fundecl)) |
2389 | current_function_returns_abnormally = 1; | |
2390 | ||
400fbf9f JW |
2391 | /* fntype now gets the type of function pointed to. */ |
2392 | fntype = TREE_TYPE (fntype); | |
2393 | ||
c96f4f73 EB |
2394 | /* Check that the function is called through a compatible prototype. |
2395 | If it is not, replace the call by a trap, wrapped up in a compound | |
2396 | expression if necessary. This has the nice side-effect to prevent | |
2397 | the tree-inliner from generating invalid assignment trees which may | |
58393038 | 2398 | blow up in the RTL expander later. */ |
1043771b | 2399 | if (CONVERT_EXPR_P (function) |
c96f4f73 EB |
2400 | && TREE_CODE (tem = TREE_OPERAND (function, 0)) == ADDR_EXPR |
2401 | && TREE_CODE (tem = TREE_OPERAND (tem, 0)) == FUNCTION_DECL | |
3f75a254 | 2402 | && !comptypes (fntype, TREE_TYPE (tem))) |
c96f4f73 EB |
2403 | { |
2404 | tree return_type = TREE_TYPE (fntype); | |
2405 | tree trap = build_function_call (built_in_decls[BUILT_IN_TRAP], | |
2406 | NULL_TREE); | |
2407 | ||
2408 | /* This situation leads to run-time undefined behavior. We can't, | |
2409 | therefore, simply error unless we can prove that all possible | |
2410 | executions of the program must execute the code. */ | |
d4ee4d25 | 2411 | warning (0, "function called through a non-compatible type"); |
c96f4f73 | 2412 | |
bba745c1 EB |
2413 | /* We can, however, treat "undefined" any way we please. |
2414 | Call abort to encourage the user to fix the program. */ | |
2415 | inform ("if this code is reached, the program will abort"); | |
2416 | ||
c96f4f73 EB |
2417 | if (VOID_TYPE_P (return_type)) |
2418 | return trap; | |
2419 | else | |
2420 | { | |
2421 | tree rhs; | |
2422 | ||
2423 | if (AGGREGATE_TYPE_P (return_type)) | |
2424 | rhs = build_compound_literal (return_type, | |
4038c495 | 2425 | build_constructor (return_type, 0)); |
c96f4f73 | 2426 | else |
4c7a6c1b | 2427 | rhs = fold_convert (return_type, integer_zero_node); |
c96f4f73 | 2428 | |
53fb4de3 | 2429 | return build2 (COMPOUND_EXPR, return_type, trap, rhs); |
c96f4f73 EB |
2430 | } |
2431 | } | |
2432 | ||
400fbf9f JW |
2433 | /* Convert the parameters to the types declared in the |
2434 | function prototype, or apply default promotions. */ | |
2435 | ||
94a0dd7b SL |
2436 | nargs = list_length (params); |
2437 | argarray = (tree *) alloca (nargs * sizeof (tree)); | |
2438 | nargs = convert_arguments (nargs, argarray, TYPE_ARG_TYPES (fntype), | |
2439 | params, function, fundecl); | |
2440 | if (nargs < 0) | |
3789b316 JM |
2441 | return error_mark_node; |
2442 | ||
83322951 RG |
2443 | /* Check that arguments to builtin functions match the expectations. */ |
2444 | if (fundecl | |
2445 | && DECL_BUILT_IN (fundecl) | |
2446 | && DECL_BUILT_IN_CLASS (fundecl) == BUILT_IN_NORMAL | |
2447 | && !check_builtin_function_arguments (fundecl, nargs, argarray)) | |
2448 | return error_mark_node; | |
400fbf9f | 2449 | |
83322951 | 2450 | /* Check that the arguments to the function are valid. */ |
94a0dd7b | 2451 | check_function_arguments (TYPE_ATTRIBUTES (fntype), nargs, argarray, |
10a22b11 | 2452 | TYPE_ARG_TYPES (fntype)); |
400fbf9f | 2453 | |
bf730f15 RS |
2454 | if (require_constant_value) |
2455 | { | |
94a0dd7b SL |
2456 | result = fold_build_call_array_initializer (TREE_TYPE (fntype), |
2457 | function, nargs, argarray); | |
bf730f15 RS |
2458 | if (TREE_CONSTANT (result) |
2459 | && (name == NULL_TREE | |
2460 | || strncmp (IDENTIFIER_POINTER (name), "__builtin_", 10) != 0)) | |
2461 | pedwarn_init ("initializer element is not constant"); | |
2462 | } | |
2463 | else | |
94a0dd7b SL |
2464 | result = fold_build_call_array (TREE_TYPE (fntype), |
2465 | function, nargs, argarray); | |
b0b3afb2 | 2466 | |
71653180 | 2467 | if (VOID_TYPE_P (TREE_TYPE (result))) |
1eb8759b RH |
2468 | return result; |
2469 | return require_complete_type (result); | |
400fbf9f JW |
2470 | } |
2471 | \f | |
2472 | /* Convert the argument expressions in the list VALUES | |
94a0dd7b SL |
2473 | to the types in the list TYPELIST. The resulting arguments are |
2474 | stored in the array ARGARRAY which has size NARGS. | |
400fbf9f JW |
2475 | |
2476 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
2477 | perform the default conversions. | |
2478 | ||
2479 | PARMLIST is the chain of parm decls for the function being called. | |
2480 | It may be 0, if that info is not available. | |
2481 | It is used only for generating error messages. | |
2482 | ||
03dafa61 JM |
2483 | FUNCTION is a tree for the called function. It is used only for |
2484 | error messages, where it is formatted with %qE. | |
400fbf9f JW |
2485 | |
2486 | This is also where warnings about wrong number of args are generated. | |
2487 | ||
94a0dd7b SL |
2488 | VALUES is a chain of TREE_LIST nodes with the elements of the list |
2489 | in the TREE_VALUE slots of those nodes. | |
400fbf9f | 2490 | |
94a0dd7b SL |
2491 | Returns the actual number of arguments processed (which may be less |
2492 | than NARGS in some error situations), or -1 on failure. */ | |
2493 | ||
2494 | static int | |
2495 | convert_arguments (int nargs, tree *argarray, | |
2496 | tree typelist, tree values, tree function, tree fundecl) | |
400fbf9f | 2497 | { |
b3694847 | 2498 | tree typetail, valtail; |
400fbf9f | 2499 | int parmnum; |
b5d32c25 KG |
2500 | const bool type_generic = fundecl |
2501 | && lookup_attribute ("type generic", TYPE_ATTRIBUTES(TREE_TYPE (fundecl))); | |
03dafa61 | 2502 | tree selector; |
03dafa61 | 2503 | |
2ac2f164 JM |
2504 | /* Change pointer to function to the function itself for |
2505 | diagnostics. */ | |
03dafa61 JM |
2506 | if (TREE_CODE (function) == ADDR_EXPR |
2507 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL) | |
2ac2f164 | 2508 | function = TREE_OPERAND (function, 0); |
03dafa61 JM |
2509 | |
2510 | /* Handle an ObjC selector specially for diagnostics. */ | |
2511 | selector = objc_message_selector (); | |
400fbf9f JW |
2512 | |
2513 | /* Scan the given expressions and types, producing individual | |
94a0dd7b | 2514 | converted arguments and storing them in ARGARRAY. */ |
400fbf9f JW |
2515 | |
2516 | for (valtail = values, typetail = typelist, parmnum = 0; | |
2517 | valtail; | |
2518 | valtail = TREE_CHAIN (valtail), parmnum++) | |
2519 | { | |
b3694847 SS |
2520 | tree type = typetail ? TREE_VALUE (typetail) : 0; |
2521 | tree val = TREE_VALUE (valtail); | |
03dafa61 JM |
2522 | tree rname = function; |
2523 | int argnum = parmnum + 1; | |
4d3e6fae | 2524 | const char *invalid_func_diag; |
400fbf9f JW |
2525 | |
2526 | if (type == void_type_node) | |
2527 | { | |
03dafa61 | 2528 | error ("too many arguments to function %qE", function); |
94a0dd7b | 2529 | return parmnum; |
400fbf9f JW |
2530 | } |
2531 | ||
03dafa61 JM |
2532 | if (selector && argnum > 2) |
2533 | { | |
2534 | rname = selector; | |
2535 | argnum -= 2; | |
2536 | } | |
2537 | ||
ed248cf7 | 2538 | STRIP_TYPE_NOPS (val); |
400fbf9f | 2539 | |
400fbf9f JW |
2540 | val = require_complete_type (val); |
2541 | ||
2542 | if (type != 0) | |
2543 | { | |
2544 | /* Formal parm type is specified by a function prototype. */ | |
2545 | tree parmval; | |
2546 | ||
20913689 | 2547 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
400fbf9f JW |
2548 | { |
2549 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
2550 | parmval = val; | |
2551 | } | |
2552 | else | |
2553 | { | |
d45cf215 RS |
2554 | /* Optionally warn about conversions that |
2555 | differ from the default conversions. */ | |
05170031 | 2556 | if (warn_traditional_conversion || warn_traditional) |
400fbf9f | 2557 | { |
e3a64162 | 2558 | unsigned int formal_prec = TYPE_PRECISION (type); |
400fbf9f | 2559 | |
aae43c5f | 2560 | if (INTEGRAL_TYPE_P (type) |
400fbf9f | 2561 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) |
d4ee4d25 | 2562 | warning (0, "passing argument %d of %qE as integer " |
03dafa61 JM |
2563 | "rather than floating due to prototype", |
2564 | argnum, rname); | |
03829ad2 KG |
2565 | if (INTEGRAL_TYPE_P (type) |
2566 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
d4ee4d25 | 2567 | warning (0, "passing argument %d of %qE as integer " |
03dafa61 JM |
2568 | "rather than complex due to prototype", |
2569 | argnum, rname); | |
aae43c5f RK |
2570 | else if (TREE_CODE (type) == COMPLEX_TYPE |
2571 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
d4ee4d25 | 2572 | warning (0, "passing argument %d of %qE as complex " |
03dafa61 JM |
2573 | "rather than floating due to prototype", |
2574 | argnum, rname); | |
400fbf9f | 2575 | else if (TREE_CODE (type) == REAL_TYPE |
aae43c5f | 2576 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
d4ee4d25 | 2577 | warning (0, "passing argument %d of %qE as floating " |
03dafa61 JM |
2578 | "rather than integer due to prototype", |
2579 | argnum, rname); | |
03829ad2 KG |
2580 | else if (TREE_CODE (type) == COMPLEX_TYPE |
2581 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) | |
d4ee4d25 | 2582 | warning (0, "passing argument %d of %qE as complex " |
03dafa61 JM |
2583 | "rather than integer due to prototype", |
2584 | argnum, rname); | |
aae43c5f RK |
2585 | else if (TREE_CODE (type) == REAL_TYPE |
2586 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
d4ee4d25 | 2587 | warning (0, "passing argument %d of %qE as floating " |
03dafa61 JM |
2588 | "rather than complex due to prototype", |
2589 | argnum, rname); | |
aae43c5f RK |
2590 | /* ??? At some point, messages should be written about |
2591 | conversions between complex types, but that's too messy | |
2592 | to do now. */ | |
d45cf215 RS |
2593 | else if (TREE_CODE (type) == REAL_TYPE |
2594 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
2595 | { | |
2596 | /* Warn if any argument is passed as `float', | |
047de90b | 2597 | since without a prototype it would be `double'. */ |
9a8ce21f JG |
2598 | if (formal_prec == TYPE_PRECISION (float_type_node) |
2599 | && type != dfloat32_type_node) | |
d4ee4d25 | 2600 | warning (0, "passing argument %d of %qE as %<float%> " |
03dafa61 JM |
2601 | "rather than %<double%> due to prototype", |
2602 | argnum, rname); | |
9a8ce21f JG |
2603 | |
2604 | /* Warn if mismatch between argument and prototype | |
2605 | for decimal float types. Warn of conversions with | |
2606 | binary float types and of precision narrowing due to | |
2607 | prototype. */ | |
2608 | else if (type != TREE_TYPE (val) | |
2609 | && (type == dfloat32_type_node | |
2610 | || type == dfloat64_type_node | |
c22cacf3 | 2611 | || type == dfloat128_type_node |
9a8ce21f JG |
2612 | || TREE_TYPE (val) == dfloat32_type_node |
2613 | || TREE_TYPE (val) == dfloat64_type_node | |
2614 | || TREE_TYPE (val) == dfloat128_type_node) | |
c22cacf3 | 2615 | && (formal_prec |
9a8ce21f JG |
2616 | <= TYPE_PRECISION (TREE_TYPE (val)) |
2617 | || (type == dfloat128_type_node | |
2618 | && (TREE_TYPE (val) | |
c22cacf3 MS |
2619 | != dfloat64_type_node |
2620 | && (TREE_TYPE (val) | |
9a8ce21f JG |
2621 | != dfloat32_type_node))) |
2622 | || (type == dfloat64_type_node | |
2623 | && (TREE_TYPE (val) | |
2624 | != dfloat32_type_node)))) | |
2625 | warning (0, "passing argument %d of %qE as %qT " | |
2626 | "rather than %qT due to prototype", | |
2627 | argnum, rname, type, TREE_TYPE (val)); | |
2628 | ||
d45cf215 | 2629 | } |
3ed56f8a KG |
2630 | /* Detect integer changing in width or signedness. |
2631 | These warnings are only activated with | |
05170031 MLI |
2632 | -Wtraditional-conversion, not with -Wtraditional. */ |
2633 | else if (warn_traditional_conversion && INTEGRAL_TYPE_P (type) | |
aae43c5f | 2634 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
400fbf9f | 2635 | { |
d45cf215 RS |
2636 | tree would_have_been = default_conversion (val); |
2637 | tree type1 = TREE_TYPE (would_have_been); | |
2638 | ||
754a4d82 | 2639 | if (TREE_CODE (type) == ENUMERAL_TYPE |
a38b987a NB |
2640 | && (TYPE_MAIN_VARIANT (type) |
2641 | == TYPE_MAIN_VARIANT (TREE_TYPE (val)))) | |
754a4d82 RS |
2642 | /* No warning if function asks for enum |
2643 | and the actual arg is that enum type. */ | |
2644 | ; | |
2645 | else if (formal_prec != TYPE_PRECISION (type1)) | |
05170031 | 2646 | warning (OPT_Wtraditional_conversion, "passing argument %d of %qE " |
3176a0c2 DD |
2647 | "with different width due to prototype", |
2648 | argnum, rname); | |
8df83eae | 2649 | else if (TYPE_UNSIGNED (type) == TYPE_UNSIGNED (type1)) |
d45cf215 | 2650 | ; |
800cd3b9 RS |
2651 | /* Don't complain if the formal parameter type |
2652 | is an enum, because we can't tell now whether | |
2653 | the value was an enum--even the same enum. */ | |
2654 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
2655 | ; | |
400fbf9f JW |
2656 | else if (TREE_CODE (val) == INTEGER_CST |
2657 | && int_fits_type_p (val, type)) | |
2658 | /* Change in signedness doesn't matter | |
2659 | if a constant value is unaffected. */ | |
2660 | ; | |
ce9895ae RS |
2661 | /* If the value is extended from a narrower |
2662 | unsigned type, it doesn't matter whether we | |
2663 | pass it as signed or unsigned; the value | |
2664 | certainly is the same either way. */ | |
2665 | else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type) | |
8df83eae | 2666 | && TYPE_UNSIGNED (TREE_TYPE (val))) |
ce9895ae | 2667 | ; |
8df83eae | 2668 | else if (TYPE_UNSIGNED (type)) |
05170031 | 2669 | warning (OPT_Wtraditional_conversion, "passing argument %d of %qE " |
3176a0c2 DD |
2670 | "as unsigned due to prototype", |
2671 | argnum, rname); | |
3ed56f8a | 2672 | else |
05170031 | 2673 | warning (OPT_Wtraditional_conversion, "passing argument %d of %qE " |
3176a0c2 | 2674 | "as signed due to prototype", argnum, rname); |
400fbf9f JW |
2675 | } |
2676 | } | |
2677 | ||
2ac2f164 JM |
2678 | parmval = convert_for_assignment (type, val, ic_argpass, |
2679 | fundecl, function, | |
2680 | parmnum + 1); | |
2f6e4e97 | 2681 | |
61f71b34 | 2682 | if (targetm.calls.promote_prototypes (fundecl ? TREE_TYPE (fundecl) : 0) |
b6d6aa84 | 2683 | && INTEGRAL_TYPE_P (type) |
400fbf9f JW |
2684 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) |
2685 | parmval = default_conversion (parmval); | |
400fbf9f | 2686 | } |
94a0dd7b | 2687 | argarray[parmnum] = parmval; |
400fbf9f JW |
2688 | } |
2689 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
c22cacf3 MS |
2690 | && (TYPE_PRECISION (TREE_TYPE (val)) |
2691 | < TYPE_PRECISION (double_type_node)) | |
9a8ce21f | 2692 | && !DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (val)))) |
b5d32c25 KG |
2693 | { |
2694 | if (type_generic) | |
2695 | argarray[parmnum] = val; | |
2696 | else | |
2697 | /* Convert `float' to `double'. */ | |
2698 | argarray[parmnum] = convert (double_type_node, val); | |
2699 | } | |
c22cacf3 MS |
2700 | else if ((invalid_func_diag = |
2701 | targetm.calls.invalid_arg_for_unprototyped_fn (typelist, fundecl, val))) | |
4d3e6fae FJ |
2702 | { |
2703 | error (invalid_func_diag); | |
94a0dd7b | 2704 | return -1; |
4d3e6fae | 2705 | } |
400fbf9f JW |
2706 | else |
2707 | /* Convert `short' and `char' to full-size `int'. */ | |
94a0dd7b | 2708 | argarray[parmnum] = default_conversion (val); |
400fbf9f JW |
2709 | |
2710 | if (typetail) | |
2711 | typetail = TREE_CHAIN (typetail); | |
2712 | } | |
2713 | ||
94a0dd7b SL |
2714 | gcc_assert (parmnum == nargs); |
2715 | ||
400fbf9f | 2716 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) |
3789b316 JM |
2717 | { |
2718 | error ("too few arguments to function %qE", function); | |
94a0dd7b | 2719 | return -1; |
3789b316 | 2720 | } |
400fbf9f | 2721 | |
94a0dd7b | 2722 | return parmnum; |
400fbf9f JW |
2723 | } |
2724 | \f | |
43f6dfd3 RS |
2725 | /* This is the entry point used by the parser to build unary operators |
2726 | in the input. CODE, a tree_code, specifies the unary operator, and | |
2727 | ARG is the operand. For unary plus, the C parser currently uses | |
2728 | CONVERT_EXPR for code. */ | |
2729 | ||
2730 | struct c_expr | |
2731 | parser_build_unary_op (enum tree_code code, struct c_expr arg) | |
2732 | { | |
2733 | struct c_expr result; | |
2734 | ||
2735 | result.original_code = ERROR_MARK; | |
2736 | result.value = build_unary_op (code, arg.value, 0); | |
59c0753d MLI |
2737 | |
2738 | if (TREE_OVERFLOW_P (result.value) && !TREE_OVERFLOW_P (arg.value)) | |
2739 | overflow_warning (result.value); | |
2740 | ||
43f6dfd3 RS |
2741 | return result; |
2742 | } | |
2743 | ||
2744 | /* This is the entry point used by the parser to build binary operators | |
2745 | in the input. CODE, a tree_code, specifies the binary operator, and | |
2746 | ARG1 and ARG2 are the operands. In addition to constructing the | |
2747 | expression, we check for operands that were written with other binary | |
2748 | operators in a way that is likely to confuse the user. */ | |
edc7c4ec | 2749 | |
487a92fe JM |
2750 | struct c_expr |
2751 | parser_build_binary_op (enum tree_code code, struct c_expr arg1, | |
2752 | struct c_expr arg2) | |
400fbf9f | 2753 | { |
487a92fe | 2754 | struct c_expr result; |
400fbf9f | 2755 | |
487a92fe JM |
2756 | enum tree_code code1 = arg1.original_code; |
2757 | enum tree_code code2 = arg2.original_code; | |
400fbf9f | 2758 | |
487a92fe JM |
2759 | result.value = build_binary_op (code, arg1.value, arg2.value, 1); |
2760 | result.original_code = code; | |
58bf601b | 2761 | |
487a92fe JM |
2762 | if (TREE_CODE (result.value) == ERROR_MARK) |
2763 | return result; | |
400fbf9f JW |
2764 | |
2765 | /* Check for cases such as x+y<<z which users are likely | |
487a92fe | 2766 | to misinterpret. */ |
400fbf9f | 2767 | if (warn_parentheses) |
2a67bec2 | 2768 | warn_about_parentheses (code, code1, code2); |
001af587 | 2769 | |
d75d71e0 | 2770 | if (TREE_CODE_CLASS (code1) != tcc_comparison) |
63a08740 DM |
2771 | warn_logical_operator (code, arg1.value, arg2.value); |
2772 | ||
e994a705 RS |
2773 | /* Warn about comparisons against string literals, with the exception |
2774 | of testing for equality or inequality of a string literal with NULL. */ | |
2775 | if (code == EQ_EXPR || code == NE_EXPR) | |
2776 | { | |
2777 | if ((code1 == STRING_CST && !integer_zerop (arg2.value)) | |
2778 | || (code2 == STRING_CST && !integer_zerop (arg1.value))) | |
4dad0aca | 2779 | warning (OPT_Waddress, "comparison with string literal results in unspecified behavior"); |
e994a705 RS |
2780 | } |
2781 | else if (TREE_CODE_CLASS (code) == tcc_comparison | |
2782 | && (code1 == STRING_CST || code2 == STRING_CST)) | |
4dad0aca | 2783 | warning (OPT_Waddress, "comparison with string literal results in unspecified behavior"); |
e994a705 | 2784 | |
59c0753d MLI |
2785 | if (TREE_OVERFLOW_P (result.value) |
2786 | && !TREE_OVERFLOW_P (arg1.value) | |
2787 | && !TREE_OVERFLOW_P (arg2.value)) | |
2788 | overflow_warning (result.value); | |
400fbf9f JW |
2789 | |
2790 | return result; | |
2791 | } | |
3e4093b6 | 2792 | \f |
3e4093b6 RS |
2793 | /* Return a tree for the difference of pointers OP0 and OP1. |
2794 | The resulting tree has type int. */ | |
293c9fdd | 2795 | |
3e4093b6 RS |
2796 | static tree |
2797 | pointer_diff (tree op0, tree op1) | |
2798 | { | |
3e4093b6 | 2799 | tree restype = ptrdiff_type_node; |
400fbf9f | 2800 | |
3e4093b6 RS |
2801 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); |
2802 | tree con0, con1, lit0, lit1; | |
2803 | tree orig_op1 = op1; | |
400fbf9f | 2804 | |
3e4093b6 RS |
2805 | if (pedantic || warn_pointer_arith) |
2806 | { | |
2807 | if (TREE_CODE (target_type) == VOID_TYPE) | |
bda67431 | 2808 | pedwarn ("pointer of type %<void *%> used in subtraction"); |
3e4093b6 RS |
2809 | if (TREE_CODE (target_type) == FUNCTION_TYPE) |
2810 | pedwarn ("pointer to a function used in subtraction"); | |
2811 | } | |
400fbf9f | 2812 | |
3e4093b6 RS |
2813 | /* If the conversion to ptrdiff_type does anything like widening or |
2814 | converting a partial to an integral mode, we get a convert_expression | |
2815 | that is in the way to do any simplifications. | |
2816 | (fold-const.c doesn't know that the extra bits won't be needed. | |
2817 | split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a | |
2818 | different mode in place.) | |
2819 | So first try to find a common term here 'by hand'; we want to cover | |
2820 | at least the cases that occur in legal static initializers. */ | |
1043771b | 2821 | if (CONVERT_EXPR_P (op0) |
1344f9a3 JM |
2822 | && (TYPE_PRECISION (TREE_TYPE (op0)) |
2823 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))))) | |
2824 | con0 = TREE_OPERAND (op0, 0); | |
2825 | else | |
2826 | con0 = op0; | |
1043771b | 2827 | if (CONVERT_EXPR_P (op1) |
1344f9a3 JM |
2828 | && (TYPE_PRECISION (TREE_TYPE (op1)) |
2829 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))))) | |
2830 | con1 = TREE_OPERAND (op1, 0); | |
2831 | else | |
2832 | con1 = op1; | |
400fbf9f | 2833 | |
3e4093b6 RS |
2834 | if (TREE_CODE (con0) == PLUS_EXPR) |
2835 | { | |
2836 | lit0 = TREE_OPERAND (con0, 1); | |
2837 | con0 = TREE_OPERAND (con0, 0); | |
2838 | } | |
2839 | else | |
2840 | lit0 = integer_zero_node; | |
400fbf9f | 2841 | |
3e4093b6 | 2842 | if (TREE_CODE (con1) == PLUS_EXPR) |
400fbf9f | 2843 | { |
3e4093b6 RS |
2844 | lit1 = TREE_OPERAND (con1, 1); |
2845 | con1 = TREE_OPERAND (con1, 0); | |
400fbf9f JW |
2846 | } |
2847 | else | |
3e4093b6 RS |
2848 | lit1 = integer_zero_node; |
2849 | ||
2850 | if (operand_equal_p (con0, con1, 0)) | |
400fbf9f | 2851 | { |
3e4093b6 RS |
2852 | op0 = lit0; |
2853 | op1 = lit1; | |
400fbf9f JW |
2854 | } |
2855 | ||
400fbf9f | 2856 | |
3e4093b6 RS |
2857 | /* First do the subtraction as integers; |
2858 | then drop through to build the divide operator. | |
2859 | Do not do default conversions on the minus operator | |
2860 | in case restype is a short type. */ | |
400fbf9f | 2861 | |
3e4093b6 RS |
2862 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), |
2863 | convert (restype, op1), 0); | |
2864 | /* This generates an error if op1 is pointer to incomplete type. */ | |
2865 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1)))) | |
2866 | error ("arithmetic on pointer to an incomplete type"); | |
400fbf9f | 2867 | |
3e4093b6 RS |
2868 | /* This generates an error if op0 is pointer to incomplete type. */ |
2869 | op1 = c_size_in_bytes (target_type); | |
400fbf9f | 2870 | |
3e4093b6 | 2871 | /* Divide by the size, in easiest possible way. */ |
987b67bc | 2872 | return fold_build2 (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); |
3e4093b6 RS |
2873 | } |
2874 | \f | |
2875 | /* Construct and perhaps optimize a tree representation | |
2876 | for a unary operation. CODE, a tree_code, specifies the operation | |
2877 | and XARG is the operand. | |
2878 | For any CODE other than ADDR_EXPR, FLAG nonzero suppresses | |
2879 | the default promotions (such as from short to int). | |
2880 | For ADDR_EXPR, the default promotions are not applied; FLAG nonzero | |
2881 | allows non-lvalues; this is only used to handle conversion of non-lvalue | |
2882 | arrays to pointers in C99. */ | |
400fbf9f | 2883 | |
3e4093b6 RS |
2884 | tree |
2885 | build_unary_op (enum tree_code code, tree xarg, int flag) | |
2886 | { | |
2887 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
2888 | tree arg = xarg; | |
2889 | tree argtype = 0; | |
808d6eaa | 2890 | enum tree_code typecode; |
3e4093b6 RS |
2891 | tree val; |
2892 | int noconvert = flag; | |
4de67c26 | 2893 | const char *invalid_op_diag; |
400fbf9f | 2894 | |
808d6eaa JM |
2895 | if (code != ADDR_EXPR) |
2896 | arg = require_complete_type (arg); | |
2897 | ||
2898 | typecode = TREE_CODE (TREE_TYPE (arg)); | |
3e4093b6 RS |
2899 | if (typecode == ERROR_MARK) |
2900 | return error_mark_node; | |
2901 | if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE) | |
2902 | typecode = INTEGER_TYPE; | |
6c36d76b | 2903 | |
4de67c26 JM |
2904 | if ((invalid_op_diag |
2905 | = targetm.invalid_unary_op (code, TREE_TYPE (xarg)))) | |
2906 | { | |
2907 | error (invalid_op_diag); | |
2908 | return error_mark_node; | |
2909 | } | |
2910 | ||
3e4093b6 RS |
2911 | switch (code) |
2912 | { | |
2913 | case CONVERT_EXPR: | |
2914 | /* This is used for unary plus, because a CONVERT_EXPR | |
2915 | is enough to prevent anybody from looking inside for | |
2916 | associativity, but won't generate any code. */ | |
2917 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
ab22c1fa | 2918 | || typecode == FIXED_POINT_TYPE || typecode == COMPLEX_TYPE |
8a2cee38 | 2919 | || typecode == VECTOR_TYPE)) |
400fbf9f | 2920 | { |
3e4093b6 RS |
2921 | error ("wrong type argument to unary plus"); |
2922 | return error_mark_node; | |
400fbf9f | 2923 | } |
3e4093b6 RS |
2924 | else if (!noconvert) |
2925 | arg = default_conversion (arg); | |
2926 | arg = non_lvalue (arg); | |
400fbf9f JW |
2927 | break; |
2928 | ||
3e4093b6 RS |
2929 | case NEGATE_EXPR: |
2930 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
ab22c1fa | 2931 | || typecode == FIXED_POINT_TYPE || typecode == COMPLEX_TYPE |
3e4093b6 RS |
2932 | || typecode == VECTOR_TYPE)) |
2933 | { | |
2934 | error ("wrong type argument to unary minus"); | |
2935 | return error_mark_node; | |
2936 | } | |
2937 | else if (!noconvert) | |
2938 | arg = default_conversion (arg); | |
400fbf9f JW |
2939 | break; |
2940 | ||
3e4093b6 | 2941 | case BIT_NOT_EXPR: |
462643f0 AP |
2942 | /* ~ works on integer types and non float vectors. */ |
2943 | if (typecode == INTEGER_TYPE | |
2944 | || (typecode == VECTOR_TYPE | |
2945 | && !VECTOR_FLOAT_TYPE_P (TREE_TYPE (arg)))) | |
03d5b1f5 | 2946 | { |
3e4093b6 RS |
2947 | if (!noconvert) |
2948 | arg = default_conversion (arg); | |
03d5b1f5 | 2949 | } |
3e4093b6 | 2950 | else if (typecode == COMPLEX_TYPE) |
400fbf9f | 2951 | { |
3e4093b6 RS |
2952 | code = CONJ_EXPR; |
2953 | if (pedantic) | |
bda67431 | 2954 | pedwarn ("ISO C does not support %<~%> for complex conjugation"); |
3e4093b6 RS |
2955 | if (!noconvert) |
2956 | arg = default_conversion (arg); | |
2957 | } | |
2958 | else | |
2959 | { | |
2960 | error ("wrong type argument to bit-complement"); | |
2961 | return error_mark_node; | |
400fbf9f JW |
2962 | } |
2963 | break; | |
2964 | ||
3e4093b6 | 2965 | case ABS_EXPR: |
11017cc7 | 2966 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE)) |
400fbf9f | 2967 | { |
3e4093b6 RS |
2968 | error ("wrong type argument to abs"); |
2969 | return error_mark_node; | |
400fbf9f | 2970 | } |
3e4093b6 RS |
2971 | else if (!noconvert) |
2972 | arg = default_conversion (arg); | |
400fbf9f JW |
2973 | break; |
2974 | ||
3e4093b6 RS |
2975 | case CONJ_EXPR: |
2976 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
2977 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
2978 | || typecode == COMPLEX_TYPE)) | |
400fbf9f | 2979 | { |
3e4093b6 RS |
2980 | error ("wrong type argument to conjugation"); |
2981 | return error_mark_node; | |
400fbf9f | 2982 | } |
3e4093b6 RS |
2983 | else if (!noconvert) |
2984 | arg = default_conversion (arg); | |
400fbf9f JW |
2985 | break; |
2986 | ||
3e4093b6 | 2987 | case TRUTH_NOT_EXPR: |
ab22c1fa | 2988 | if (typecode != INTEGER_TYPE && typecode != FIXED_POINT_TYPE |
3e4093b6 | 2989 | && typecode != REAL_TYPE && typecode != POINTER_TYPE |
46bdb9cf | 2990 | && typecode != COMPLEX_TYPE) |
400fbf9f | 2991 | { |
3e4093b6 RS |
2992 | error ("wrong type argument to unary exclamation mark"); |
2993 | return error_mark_node; | |
400fbf9f | 2994 | } |
85498824 | 2995 | arg = c_objc_common_truthvalue_conversion (arg); |
3e4093b6 RS |
2996 | return invert_truthvalue (arg); |
2997 | ||
3e4093b6 RS |
2998 | case REALPART_EXPR: |
2999 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3000 | return TREE_REALPART (arg); | |
3001 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
987b67bc | 3002 | return fold_build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg); |
3e4093b6 RS |
3003 | else |
3004 | return arg; | |
605a99f6 | 3005 | |
3e4093b6 RS |
3006 | case IMAGPART_EXPR: |
3007 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3008 | return TREE_IMAGPART (arg); | |
3009 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
987b67bc | 3010 | return fold_build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg); |
3e4093b6 RS |
3011 | else |
3012 | return convert (TREE_TYPE (arg), integer_zero_node); | |
3013 | ||
3014 | case PREINCREMENT_EXPR: | |
3015 | case POSTINCREMENT_EXPR: | |
3016 | case PREDECREMENT_EXPR: | |
3017 | case POSTDECREMENT_EXPR: | |
3e4093b6 RS |
3018 | |
3019 | /* Increment or decrement the real part of the value, | |
3020 | and don't change the imaginary part. */ | |
3021 | if (typecode == COMPLEX_TYPE) | |
400fbf9f | 3022 | { |
3e4093b6 RS |
3023 | tree real, imag; |
3024 | ||
3025 | if (pedantic) | |
bda67431 JM |
3026 | pedwarn ("ISO C does not support %<++%> and %<--%>" |
3027 | " on complex types"); | |
3e4093b6 RS |
3028 | |
3029 | arg = stabilize_reference (arg); | |
3030 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
3031 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
a87db577 AP |
3032 | real = build_unary_op (code, real, 1); |
3033 | if (real == error_mark_node || imag == error_mark_node) | |
3034 | return error_mark_node; | |
53fb4de3 | 3035 | return build2 (COMPLEX_EXPR, TREE_TYPE (arg), |
a87db577 | 3036 | real, imag); |
400fbf9f | 3037 | } |
3e4093b6 RS |
3038 | |
3039 | /* Report invalid types. */ | |
3040 | ||
ab22c1fa | 3041 | if (typecode != POINTER_TYPE && typecode != FIXED_POINT_TYPE |
3e4093b6 | 3042 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) |
400fbf9f | 3043 | { |
3e4093b6 | 3044 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) |
c22cacf3 MS |
3045 | error ("wrong type argument to increment"); |
3046 | else | |
3047 | error ("wrong type argument to decrement"); | |
3e4093b6 RS |
3048 | |
3049 | return error_mark_node; | |
400fbf9f | 3050 | } |
400fbf9f | 3051 | |
3e4093b6 RS |
3052 | { |
3053 | tree inc; | |
3054 | tree result_type = TREE_TYPE (arg); | |
400fbf9f | 3055 | |
3e4093b6 RS |
3056 | arg = get_unwidened (arg, 0); |
3057 | argtype = TREE_TYPE (arg); | |
3058 | ||
3059 | /* Compute the increment. */ | |
3060 | ||
3061 | if (typecode == POINTER_TYPE) | |
3062 | { | |
3063 | /* If pointer target is an undefined struct, | |
3064 | we just cannot know how to do the arithmetic. */ | |
3065 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type))) | |
3066 | { | |
3067 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
3068 | error ("increment of pointer to unknown structure"); | |
3069 | else | |
3070 | error ("decrement of pointer to unknown structure"); | |
3071 | } | |
3072 | else if ((pedantic || warn_pointer_arith) | |
3073 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
3074 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
c22cacf3 | 3075 | { |
3e4093b6 RS |
3076 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) |
3077 | pedwarn ("wrong type argument to increment"); | |
3078 | else | |
3079 | pedwarn ("wrong type argument to decrement"); | |
3080 | } | |
3081 | ||
3082 | inc = c_size_in_bytes (TREE_TYPE (result_type)); | |
5be014d5 | 3083 | inc = fold_convert (sizetype, inc); |
3e4093b6 | 3084 | } |
ab22c1fa CF |
3085 | else if (FRACT_MODE_P (TYPE_MODE (result_type))) |
3086 | { | |
3087 | /* For signed fract types, we invert ++ to -- or | |
3088 | -- to ++, and change inc from 1 to -1, because | |
3089 | it is not possible to represent 1 in signed fract constants. | |
3090 | For unsigned fract types, the result always overflows and | |
3091 | we get an undefined (original) or the maximum value. */ | |
3092 | if (code == PREINCREMENT_EXPR) | |
3093 | code = PREDECREMENT_EXPR; | |
3094 | else if (code == PREDECREMENT_EXPR) | |
3095 | code = PREINCREMENT_EXPR; | |
3096 | else if (code == POSTINCREMENT_EXPR) | |
3097 | code = POSTDECREMENT_EXPR; | |
3098 | else /* code == POSTDECREMENT_EXPR */ | |
3099 | code = POSTINCREMENT_EXPR; | |
3100 | ||
3101 | inc = integer_minus_one_node; | |
3102 | inc = convert (argtype, inc); | |
3103 | } | |
3e4093b6 | 3104 | else |
5be014d5 AP |
3105 | { |
3106 | inc = integer_one_node; | |
3107 | inc = convert (argtype, inc); | |
3108 | } | |
3e4093b6 | 3109 | |
3e4093b6 RS |
3110 | /* Complain about anything else that is not a true lvalue. */ |
3111 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
3112 | || code == POSTINCREMENT_EXPR) | |
9bf24266 JM |
3113 | ? lv_increment |
3114 | : lv_decrement))) | |
3e4093b6 RS |
3115 | return error_mark_node; |
3116 | ||
3117 | /* Report a read-only lvalue. */ | |
3118 | if (TREE_READONLY (arg)) | |
953ff289 DN |
3119 | { |
3120 | readonly_error (arg, | |
3121 | ((code == PREINCREMENT_EXPR | |
3122 | || code == POSTINCREMENT_EXPR) | |
3123 | ? lv_increment : lv_decrement)); | |
3124 | return error_mark_node; | |
3125 | } | |
3e4093b6 RS |
3126 | |
3127 | if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE) | |
3128 | val = boolean_increment (code, arg); | |
3129 | else | |
53fb4de3 | 3130 | val = build2 (code, TREE_TYPE (arg), arg, inc); |
3e4093b6 RS |
3131 | TREE_SIDE_EFFECTS (val) = 1; |
3132 | val = convert (result_type, val); | |
3133 | if (TREE_CODE (val) != code) | |
6de9cd9a | 3134 | TREE_NO_WARNING (val) = 1; |
3e4093b6 RS |
3135 | return val; |
3136 | } | |
3137 | ||
3138 | case ADDR_EXPR: | |
3139 | /* Note that this operation never does default_conversion. */ | |
3140 | ||
3141 | /* Let &* cancel out to simplify resulting code. */ | |
3142 | if (TREE_CODE (arg) == INDIRECT_REF) | |
400fbf9f | 3143 | { |
3e4093b6 RS |
3144 | /* Don't let this be an lvalue. */ |
3145 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
3146 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
3147 | return TREE_OPERAND (arg, 0); | |
400fbf9f | 3148 | } |
1eb8759b | 3149 | |
7c672dfc | 3150 | /* For &x[y], return x+y */ |
3e4093b6 | 3151 | if (TREE_CODE (arg) == ARRAY_REF) |
1eb8759b | 3152 | { |
f2a71bbc JM |
3153 | tree op0 = TREE_OPERAND (arg, 0); |
3154 | if (!c_mark_addressable (op0)) | |
3e4093b6 | 3155 | return error_mark_node; |
46bdb9cf | 3156 | return build_binary_op (PLUS_EXPR, |
f2a71bbc JM |
3157 | (TREE_CODE (TREE_TYPE (op0)) == ARRAY_TYPE |
3158 | ? array_to_pointer_conversion (op0) | |
3159 | : op0), | |
7c672dfc | 3160 | TREE_OPERAND (arg, 1), 1); |
1eb8759b | 3161 | } |
1eb8759b | 3162 | |
3e4093b6 RS |
3163 | /* Anything not already handled and not a true memory reference |
3164 | or a non-lvalue array is an error. */ | |
3165 | else if (typecode != FUNCTION_TYPE && !flag | |
9bf24266 | 3166 | && !lvalue_or_else (arg, lv_addressof)) |
3e4093b6 | 3167 | return error_mark_node; |
b6a10c9f | 3168 | |
3e4093b6 RS |
3169 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ |
3170 | argtype = TREE_TYPE (arg); | |
400fbf9f | 3171 | |
3e4093b6 | 3172 | /* If the lvalue is const or volatile, merge that into the type |
c22cacf3 | 3173 | to which the address will point. Note that you can't get a |
3e4093b6 RS |
3174 | restricted pointer by taking the address of something, so we |
3175 | only have to deal with `const' and `volatile' here. */ | |
6615c446 | 3176 | if ((DECL_P (arg) || REFERENCE_CLASS_P (arg)) |
3e4093b6 RS |
3177 | && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg))) |
3178 | argtype = c_build_type_variant (argtype, | |
3179 | TREE_READONLY (arg), | |
3180 | TREE_THIS_VOLATILE (arg)); | |
400fbf9f | 3181 | |
3e4093b6 RS |
3182 | if (!c_mark_addressable (arg)) |
3183 | return error_mark_node; | |
400fbf9f | 3184 | |
abb54d14 JM |
3185 | gcc_assert (TREE_CODE (arg) != COMPONENT_REF |
3186 | || !DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1))); | |
400fbf9f | 3187 | |
5cc200fc | 3188 | argtype = build_pointer_type (argtype); |
5e55f99d RH |
3189 | |
3190 | /* ??? Cope with user tricks that amount to offsetof. Delete this | |
3191 | when we have proper support for integer constant expressions. */ | |
3192 | val = get_base_address (arg); | |
3193 | if (val && TREE_CODE (val) == INDIRECT_REF | |
3aa2ddb8 JJ |
3194 | && TREE_CONSTANT (TREE_OPERAND (val, 0))) |
3195 | { | |
5be014d5 | 3196 | tree op0 = fold_convert (sizetype, fold_offsetof (arg, val)), op1; |
3aa2ddb8 JJ |
3197 | |
3198 | op1 = fold_convert (argtype, TREE_OPERAND (val, 0)); | |
5be014d5 | 3199 | return fold_build2 (POINTER_PLUS_EXPR, argtype, op1, op0); |
3aa2ddb8 | 3200 | } |
5e55f99d | 3201 | |
5cc200fc | 3202 | val = build1 (ADDR_EXPR, argtype, arg); |
400fbf9f | 3203 | |
5cc200fc | 3204 | return val; |
400fbf9f | 3205 | |
3e4093b6 | 3206 | default: |
1344f9a3 | 3207 | gcc_unreachable (); |
3e4093b6 | 3208 | } |
400fbf9f | 3209 | |
3e4093b6 RS |
3210 | if (argtype == 0) |
3211 | argtype = TREE_TYPE (arg); | |
00d1b1d6 | 3212 | return require_constant_value ? fold_build1_initializer (code, argtype, arg) |
c22cacf3 | 3213 | : fold_build1 (code, argtype, arg); |
3e4093b6 | 3214 | } |
400fbf9f | 3215 | |
3e4093b6 RS |
3216 | /* Return nonzero if REF is an lvalue valid for this language. |
3217 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
5baeaac0 | 3218 | Lvalues can have their address taken, unless they have C_DECL_REGISTER. */ |
400fbf9f | 3219 | |
37dc0d8d | 3220 | static int |
58f9752a | 3221 | lvalue_p (const_tree ref) |
3e4093b6 | 3222 | { |
58f9752a | 3223 | const enum tree_code code = TREE_CODE (ref); |
400fbf9f | 3224 | |
3e4093b6 RS |
3225 | switch (code) |
3226 | { | |
3227 | case REALPART_EXPR: | |
3228 | case IMAGPART_EXPR: | |
3229 | case COMPONENT_REF: | |
3230 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
400fbf9f | 3231 | |
3e4093b6 RS |
3232 | case COMPOUND_LITERAL_EXPR: |
3233 | case STRING_CST: | |
3234 | return 1; | |
400fbf9f | 3235 | |
3e4093b6 RS |
3236 | case INDIRECT_REF: |
3237 | case ARRAY_REF: | |
3238 | case VAR_DECL: | |
3239 | case PARM_DECL: | |
3240 | case RESULT_DECL: | |
3241 | case ERROR_MARK: | |
3242 | return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE | |
3243 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE); | |
665f2503 | 3244 | |
3e4093b6 | 3245 | case BIND_EXPR: |
3e4093b6 | 3246 | return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE; |
665f2503 | 3247 | |
3e4093b6 RS |
3248 | default: |
3249 | return 0; | |
3250 | } | |
3251 | } | |
400fbf9f | 3252 | \f |
9bf24266 | 3253 | /* Give an error for storing in something that is 'const'. */ |
54c93c30 | 3254 | |
9bf24266 JM |
3255 | static void |
3256 | readonly_error (tree arg, enum lvalue_use use) | |
54c93c30 | 3257 | { |
5544530a PB |
3258 | gcc_assert (use == lv_assign || use == lv_increment || use == lv_decrement |
3259 | || use == lv_asm); | |
9bf24266 JM |
3260 | /* Using this macro rather than (for example) arrays of messages |
3261 | ensures that all the format strings are checked at compile | |
3262 | time. */ | |
5544530a | 3263 | #define READONLY_MSG(A, I, D, AS) (use == lv_assign ? (A) \ |
c22cacf3 | 3264 | : (use == lv_increment ? (I) \ |
5544530a | 3265 | : (use == lv_decrement ? (D) : (AS)))) |
3e4093b6 | 3266 | if (TREE_CODE (arg) == COMPONENT_REF) |
54c93c30 | 3267 | { |
3e4093b6 | 3268 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) |
9bf24266 | 3269 | readonly_error (TREE_OPERAND (arg, 0), use); |
3e4093b6 | 3270 | else |
4b794eaf JJ |
3271 | error (READONLY_MSG (G_("assignment of read-only member %qD"), |
3272 | G_("increment of read-only member %qD"), | |
5544530a PB |
3273 | G_("decrement of read-only member %qD"), |
3274 | G_("read-only member %qD used as %<asm%> output")), | |
c51a1ba9 | 3275 | TREE_OPERAND (arg, 1)); |
54c93c30 | 3276 | } |
3e4093b6 | 3277 | else if (TREE_CODE (arg) == VAR_DECL) |
4b794eaf JJ |
3278 | error (READONLY_MSG (G_("assignment of read-only variable %qD"), |
3279 | G_("increment of read-only variable %qD"), | |
5544530a PB |
3280 | G_("decrement of read-only variable %qD"), |
3281 | G_("read-only variable %qD used as %<asm%> output")), | |
c51a1ba9 | 3282 | arg); |
3e4093b6 | 3283 | else |
d7705934 DB |
3284 | error (READONLY_MSG (G_("assignment of read-only location %qE"), |
3285 | G_("increment of read-only location %qE"), | |
3286 | G_("decrement of read-only location %qE"), | |
3287 | G_("read-only location %qE used as %<asm%> output")), | |
3288 | arg); | |
54c93c30 | 3289 | } |
37dc0d8d JM |
3290 | |
3291 | ||
3292 | /* Return nonzero if REF is an lvalue valid for this language; | |
3293 | otherwise, print an error message and return zero. USE says | |
3294 | how the lvalue is being used and so selects the error message. */ | |
3295 | ||
3296 | static int | |
58f9752a | 3297 | lvalue_or_else (const_tree ref, enum lvalue_use use) |
37dc0d8d JM |
3298 | { |
3299 | int win = lvalue_p (ref); | |
3300 | ||
3301 | if (!win) | |
3302 | lvalue_error (use); | |
3303 | ||
3304 | return win; | |
3305 | } | |
3e4093b6 RS |
3306 | \f |
3307 | /* Mark EXP saying that we need to be able to take the | |
3308 | address of it; it should not be allocated in a register. | |
3309 | Returns true if successful. */ | |
54c93c30 | 3310 | |
3e4093b6 RS |
3311 | bool |
3312 | c_mark_addressable (tree exp) | |
400fbf9f | 3313 | { |
3e4093b6 | 3314 | tree x = exp; |
95602da1 | 3315 | |
3e4093b6 RS |
3316 | while (1) |
3317 | switch (TREE_CODE (x)) | |
3318 | { | |
3319 | case COMPONENT_REF: | |
3320 | if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1))) | |
3321 | { | |
0039fa55 AN |
3322 | error |
3323 | ("cannot take address of bit-field %qD", TREE_OPERAND (x, 1)); | |
3e4093b6 RS |
3324 | return false; |
3325 | } | |
95602da1 | 3326 | |
3e4093b6 | 3327 | /* ... fall through ... */ |
95602da1 | 3328 | |
3e4093b6 RS |
3329 | case ADDR_EXPR: |
3330 | case ARRAY_REF: | |
3331 | case REALPART_EXPR: | |
3332 | case IMAGPART_EXPR: | |
3333 | x = TREE_OPERAND (x, 0); | |
3334 | break; | |
95602da1 | 3335 | |
3e4093b6 RS |
3336 | case COMPOUND_LITERAL_EXPR: |
3337 | case CONSTRUCTOR: | |
3338 | TREE_ADDRESSABLE (x) = 1; | |
3339 | return true; | |
95602da1 | 3340 | |
3e4093b6 RS |
3341 | case VAR_DECL: |
3342 | case CONST_DECL: | |
3343 | case PARM_DECL: | |
3344 | case RESULT_DECL: | |
5baeaac0 | 3345 | if (C_DECL_REGISTER (x) |
3e4093b6 RS |
3346 | && DECL_NONLOCAL (x)) |
3347 | { | |
e697b20f | 3348 | if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x)) |
3e4093b6 | 3349 | { |
0039fa55 AN |
3350 | error |
3351 | ("global register variable %qD used in nested function", x); | |
3e4093b6 RS |
3352 | return false; |
3353 | } | |
0039fa55 | 3354 | pedwarn ("register variable %qD used in nested function", x); |
3e4093b6 | 3355 | } |
5baeaac0 | 3356 | else if (C_DECL_REGISTER (x)) |
3e4093b6 | 3357 | { |
e697b20f | 3358 | if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x)) |
0039fa55 AN |
3359 | error ("address of global register variable %qD requested", x); |
3360 | else | |
3361 | error ("address of register variable %qD requested", x); | |
3362 | return false; | |
3e4093b6 | 3363 | } |
400fbf9f | 3364 | |
3e4093b6 RS |
3365 | /* drops in */ |
3366 | case FUNCTION_DECL: | |
3367 | TREE_ADDRESSABLE (x) = 1; | |
3368 | /* drops out */ | |
3369 | default: | |
3370 | return true; | |
3371 | } | |
3372 | } | |
3373 | \f | |
3374 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
400fbf9f JW |
3375 | |
3376 | tree | |
3e4093b6 | 3377 | build_conditional_expr (tree ifexp, tree op1, tree op2) |
400fbf9f | 3378 | { |
3e4093b6 RS |
3379 | tree type1; |
3380 | tree type2; | |
3381 | enum tree_code code1; | |
3382 | enum tree_code code2; | |
3383 | tree result_type = NULL; | |
3384 | tree orig_op1 = op1, orig_op2 = op2; | |
400fbf9f | 3385 | |
3e4093b6 RS |
3386 | /* Promote both alternatives. */ |
3387 | ||
3388 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
3389 | op1 = default_conversion (op1); | |
3390 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
3391 | op2 = default_conversion (op2); | |
3392 | ||
3393 | if (TREE_CODE (ifexp) == ERROR_MARK | |
3394 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
3395 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
400fbf9f | 3396 | return error_mark_node; |
400fbf9f | 3397 | |
3e4093b6 RS |
3398 | type1 = TREE_TYPE (op1); |
3399 | code1 = TREE_CODE (type1); | |
3400 | type2 = TREE_TYPE (op2); | |
3401 | code2 = TREE_CODE (type2); | |
3402 | ||
b1adf557 JM |
3403 | /* C90 does not permit non-lvalue arrays in conditional expressions. |
3404 | In C99 they will be pointers by now. */ | |
3405 | if (code1 == ARRAY_TYPE || code2 == ARRAY_TYPE) | |
3406 | { | |
3407 | error ("non-lvalue array in conditional expression"); | |
3408 | return error_mark_node; | |
3409 | } | |
3410 | ||
3e4093b6 RS |
3411 | /* Quickly detect the usual case where op1 and op2 have the same type |
3412 | after promotion. */ | |
3413 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) | |
400fbf9f | 3414 | { |
3e4093b6 RS |
3415 | if (type1 == type2) |
3416 | result_type = type1; | |
3417 | else | |
3418 | result_type = TYPE_MAIN_VARIANT (type1); | |
3419 | } | |
3420 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
c22cacf3 MS |
3421 | || code1 == COMPLEX_TYPE) |
3422 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE | |
3423 | || code2 == COMPLEX_TYPE)) | |
3e4093b6 | 3424 | { |
ccf7f880 | 3425 | result_type = c_common_type (type1, type2); |
400fbf9f | 3426 | |
3e4093b6 RS |
3427 | /* If -Wsign-compare, warn here if type1 and type2 have |
3428 | different signedness. We'll promote the signed to unsigned | |
3429 | and later code won't know it used to be different. | |
3430 | Do this check on the original types, so that explicit casts | |
3431 | will be considered, but default promotions won't. */ | |
3432 | if (warn_sign_compare && !skip_evaluation) | |
ab87f8c8 | 3433 | { |
8df83eae RK |
3434 | int unsigned_op1 = TYPE_UNSIGNED (TREE_TYPE (orig_op1)); |
3435 | int unsigned_op2 = TYPE_UNSIGNED (TREE_TYPE (orig_op2)); | |
400fbf9f | 3436 | |
3e4093b6 RS |
3437 | if (unsigned_op1 ^ unsigned_op2) |
3438 | { | |
6ac01510 ILT |
3439 | bool ovf; |
3440 | ||
3e4093b6 RS |
3441 | /* Do not warn if the result type is signed, since the |
3442 | signed type will only be chosen if it can represent | |
3443 | all the values of the unsigned type. */ | |
3f75a254 | 3444 | if (!TYPE_UNSIGNED (result_type)) |
3e4093b6 RS |
3445 | /* OK */; |
3446 | /* Do not warn if the signed quantity is an unsuffixed | |
3447 | integer literal (or some static constant expression | |
3448 | involving such literals) and it is non-negative. */ | |
6ac01510 ILT |
3449 | else if ((unsigned_op2 |
3450 | && tree_expr_nonnegative_warnv_p (op1, &ovf)) | |
3451 | || (unsigned_op1 | |
3452 | && tree_expr_nonnegative_warnv_p (op2, &ovf))) | |
3e4093b6 RS |
3453 | /* OK */; |
3454 | else | |
c5409249 | 3455 | warning (OPT_Wsign_compare, "signed and unsigned type in conditional expression"); |
3e4093b6 RS |
3456 | } |
3457 | } | |
3458 | } | |
3459 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3460 | { | |
3461 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
3462 | pedwarn ("ISO C forbids conditional expr with only one void side"); | |
3463 | result_type = void_type_node; | |
3464 | } | |
3465 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3466 | { | |
58393038 | 3467 | if (comp_target_types (type1, type2)) |
10bc1b1b | 3468 | result_type = common_pointer_type (type1, type2); |
6aa3c60d | 3469 | else if (null_pointer_constant_p (orig_op1)) |
3e4093b6 | 3470 | result_type = qualify_type (type2, type1); |
6aa3c60d | 3471 | else if (null_pointer_constant_p (orig_op2)) |
3e4093b6 RS |
3472 | result_type = qualify_type (type1, type2); |
3473 | else if (VOID_TYPE_P (TREE_TYPE (type1))) | |
34a80643 | 3474 | { |
3e4093b6 | 3475 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) |
bda67431 JM |
3476 | pedwarn ("ISO C forbids conditional expr between " |
3477 | "%<void *%> and function pointer"); | |
3e4093b6 RS |
3478 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type1), |
3479 | TREE_TYPE (type2))); | |
34a80643 | 3480 | } |
3e4093b6 | 3481 | else if (VOID_TYPE_P (TREE_TYPE (type2))) |
1c2a9b35 | 3482 | { |
3e4093b6 | 3483 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) |
bda67431 JM |
3484 | pedwarn ("ISO C forbids conditional expr between " |
3485 | "%<void *%> and function pointer"); | |
3e4093b6 RS |
3486 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type2), |
3487 | TREE_TYPE (type1))); | |
1c2a9b35 | 3488 | } |
34a80643 | 3489 | else |
ab87f8c8 | 3490 | { |
3e4093b6 RS |
3491 | pedwarn ("pointer type mismatch in conditional expression"); |
3492 | result_type = build_pointer_type (void_type_node); | |
ab87f8c8 | 3493 | } |
3e4093b6 RS |
3494 | } |
3495 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3496 | { | |
6aa3c60d | 3497 | if (!null_pointer_constant_p (orig_op2)) |
3e4093b6 RS |
3498 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
3499 | else | |
ab87f8c8 | 3500 | { |
3e4093b6 | 3501 | op2 = null_pointer_node; |
ab87f8c8 | 3502 | } |
3e4093b6 RS |
3503 | result_type = type1; |
3504 | } | |
3505 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3506 | { | |
6aa3c60d | 3507 | if (!null_pointer_constant_p (orig_op1)) |
3e4093b6 RS |
3508 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
3509 | else | |
ab87f8c8 | 3510 | { |
3e4093b6 | 3511 | op1 = null_pointer_node; |
ab87f8c8 | 3512 | } |
3e4093b6 RS |
3513 | result_type = type2; |
3514 | } | |
1c2a9b35 | 3515 | |
3e4093b6 RS |
3516 | if (!result_type) |
3517 | { | |
3518 | if (flag_cond_mismatch) | |
3519 | result_type = void_type_node; | |
3520 | else | |
400fbf9f | 3521 | { |
3e4093b6 | 3522 | error ("type mismatch in conditional expression"); |
ab87f8c8 | 3523 | return error_mark_node; |
400fbf9f | 3524 | } |
3e4093b6 | 3525 | } |
400fbf9f | 3526 | |
3e4093b6 RS |
3527 | /* Merge const and volatile flags of the incoming types. */ |
3528 | result_type | |
3529 | = build_type_variant (result_type, | |
3530 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
3531 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
b6a10c9f | 3532 | |
3e4093b6 RS |
3533 | if (result_type != TREE_TYPE (op1)) |
3534 | op1 = convert_and_check (result_type, op1); | |
3535 | if (result_type != TREE_TYPE (op2)) | |
3536 | op2 = convert_and_check (result_type, op2); | |
b6a10c9f | 3537 | |
8c900457 | 3538 | return fold_build3 (COND_EXPR, result_type, ifexp, op1, op2); |
3e4093b6 RS |
3539 | } |
3540 | \f | |
487a92fe JM |
3541 | /* Return a compound expression that performs two expressions and |
3542 | returns the value of the second of them. */ | |
400fbf9f | 3543 | |
3e4093b6 | 3544 | tree |
487a92fe | 3545 | build_compound_expr (tree expr1, tree expr2) |
3e4093b6 | 3546 | { |
3f75a254 | 3547 | if (!TREE_SIDE_EFFECTS (expr1)) |
3e4093b6 RS |
3548 | { |
3549 | /* The left-hand operand of a comma expression is like an expression | |
c5409249 | 3550 | statement: with -Wunused, we should warn if it doesn't have |
3e4093b6 | 3551 | any side-effects, unless it was explicitly cast to (void). */ |
e14a6540 | 3552 | if (warn_unused_value) |
47aecf47 | 3553 | { |
e14a6540 | 3554 | if (VOID_TYPE_P (TREE_TYPE (expr1)) |
1043771b | 3555 | && CONVERT_EXPR_P (expr1)) |
47aecf47 | 3556 | ; /* (void) a, b */ |
e14a6540 JM |
3557 | else if (VOID_TYPE_P (TREE_TYPE (expr1)) |
3558 | && TREE_CODE (expr1) == COMPOUND_EXPR | |
1043771b | 3559 | && CONVERT_EXPR_P (TREE_OPERAND (expr1, 1))) |
47aecf47 JM |
3560 | ; /* (void) a, (void) b, c */ |
3561 | else | |
253a697e DM |
3562 | warning (OPT_Wunused_value, |
3563 | "left-hand operand of comma expression has no effect"); | |
47aecf47 | 3564 | } |
3e4093b6 | 3565 | } |
400fbf9f | 3566 | |
3e4093b6 RS |
3567 | /* With -Wunused, we should also warn if the left-hand operand does have |
3568 | side-effects, but computes a value which is not used. For example, in | |
3569 | `foo() + bar(), baz()' the result of the `+' operator is not used, | |
3570 | so we should issue a warning. */ | |
3571 | else if (warn_unused_value) | |
487a92fe | 3572 | warn_if_unused_value (expr1, input_location); |
400fbf9f | 3573 | |
e63d6886 AP |
3574 | if (expr2 == error_mark_node) |
3575 | return error_mark_node; | |
3576 | ||
53fb4de3 | 3577 | return build2 (COMPOUND_EXPR, TREE_TYPE (expr2), expr1, expr2); |
3e4093b6 | 3578 | } |
400fbf9f | 3579 | |
3e4093b6 | 3580 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ |
400fbf9f | 3581 | |
3e4093b6 RS |
3582 | tree |
3583 | build_c_cast (tree type, tree expr) | |
3584 | { | |
3585 | tree value = expr; | |
400fbf9f | 3586 | |
3e4093b6 RS |
3587 | if (type == error_mark_node || expr == error_mark_node) |
3588 | return error_mark_node; | |
400fbf9f | 3589 | |
3e4093b6 RS |
3590 | /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing |
3591 | only in <protocol> qualifications. But when constructing cast expressions, | |
3592 | the protocols do matter and must be kept around. */ | |
700686fa ZL |
3593 | if (objc_is_object_ptr (type) && objc_is_object_ptr (TREE_TYPE (expr))) |
3594 | return build1 (NOP_EXPR, type, expr); | |
3595 | ||
3596 | type = TYPE_MAIN_VARIANT (type); | |
400fbf9f | 3597 | |
3e4093b6 RS |
3598 | if (TREE_CODE (type) == ARRAY_TYPE) |
3599 | { | |
3600 | error ("cast specifies array type"); | |
3601 | return error_mark_node; | |
3602 | } | |
400fbf9f | 3603 | |
3e4093b6 RS |
3604 | if (TREE_CODE (type) == FUNCTION_TYPE) |
3605 | { | |
3606 | error ("cast specifies function type"); | |
3607 | return error_mark_node; | |
3608 | } | |
400fbf9f | 3609 | |
808d6eaa JM |
3610 | if (!VOID_TYPE_P (type)) |
3611 | { | |
3612 | value = require_complete_type (value); | |
3613 | if (value == error_mark_node) | |
3614 | return error_mark_node; | |
3615 | } | |
3616 | ||
3e4093b6 RS |
3617 | if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value))) |
3618 | { | |
3619 | if (pedantic) | |
400fbf9f | 3620 | { |
3e4093b6 RS |
3621 | if (TREE_CODE (type) == RECORD_TYPE |
3622 | || TREE_CODE (type) == UNION_TYPE) | |
3623 | pedwarn ("ISO C forbids casting nonscalar to the same type"); | |
400fbf9f | 3624 | } |
3e4093b6 RS |
3625 | } |
3626 | else if (TREE_CODE (type) == UNION_TYPE) | |
3627 | { | |
3628 | tree field; | |
400fbf9f | 3629 | |
3e4093b6 | 3630 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
39ffbac9 VR |
3631 | if (TREE_TYPE (field) != error_mark_node |
3632 | && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
3633 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
3e4093b6 RS |
3634 | break; |
3635 | ||
3636 | if (field) | |
400fbf9f | 3637 | { |
3e4093b6 RS |
3638 | tree t; |
3639 | ||
3640 | if (pedantic) | |
3641 | pedwarn ("ISO C forbids casts to union type"); | |
3642 | t = digest_init (type, | |
4038c495 | 3643 | build_constructor_single (type, field, value), |
916c5919 | 3644 | true, 0); |
3e4093b6 RS |
3645 | TREE_CONSTANT (t) = TREE_CONSTANT (value); |
3646 | return t; | |
400fbf9f | 3647 | } |
3e4093b6 RS |
3648 | error ("cast to union type from type not present in union"); |
3649 | return error_mark_node; | |
3650 | } | |
3651 | else | |
3652 | { | |
3653 | tree otype, ovalue; | |
400fbf9f | 3654 | |
3e4093b6 RS |
3655 | if (type == void_type_node) |
3656 | return build1 (CONVERT_EXPR, type, value); | |
400fbf9f | 3657 | |
3e4093b6 | 3658 | otype = TREE_TYPE (value); |
400fbf9f | 3659 | |
3e4093b6 | 3660 | /* Optionally warn about potentially worrisome casts. */ |
770ae6cc | 3661 | |
3e4093b6 RS |
3662 | if (warn_cast_qual |
3663 | && TREE_CODE (type) == POINTER_TYPE | |
3664 | && TREE_CODE (otype) == POINTER_TYPE) | |
3665 | { | |
3666 | tree in_type = type; | |
3667 | tree in_otype = otype; | |
3668 | int added = 0; | |
3669 | int discarded = 0; | |
400fbf9f | 3670 | |
3e4093b6 RS |
3671 | /* Check that the qualifiers on IN_TYPE are a superset of |
3672 | the qualifiers of IN_OTYPE. The outermost level of | |
3673 | POINTER_TYPE nodes is uninteresting and we stop as soon | |
3674 | as we hit a non-POINTER_TYPE node on either type. */ | |
3675 | do | |
3676 | { | |
3677 | in_otype = TREE_TYPE (in_otype); | |
3678 | in_type = TREE_TYPE (in_type); | |
400fbf9f | 3679 | |
3e4093b6 RS |
3680 | /* GNU C allows cv-qualified function types. 'const' |
3681 | means the function is very pure, 'volatile' means it | |
3682 | can't return. We need to warn when such qualifiers | |
3683 | are added, not when they're taken away. */ | |
3684 | if (TREE_CODE (in_otype) == FUNCTION_TYPE | |
3685 | && TREE_CODE (in_type) == FUNCTION_TYPE) | |
3686 | added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype)); | |
3687 | else | |
3688 | discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type)); | |
3689 | } | |
3690 | while (TREE_CODE (in_type) == POINTER_TYPE | |
3691 | && TREE_CODE (in_otype) == POINTER_TYPE); | |
400fbf9f | 3692 | |
3e4093b6 | 3693 | if (added) |
ea7c218e | 3694 | warning (OPT_Wcast_qual, "cast adds new qualifiers to function type"); |
400fbf9f | 3695 | |
3e4093b6 RS |
3696 | if (discarded) |
3697 | /* There are qualifiers present in IN_OTYPE that are not | |
3698 | present in IN_TYPE. */ | |
ea7c218e | 3699 | warning (OPT_Wcast_qual, "cast discards qualifiers from pointer target type"); |
3e4093b6 | 3700 | } |
400fbf9f | 3701 | |
3e4093b6 | 3702 | /* Warn about possible alignment problems. */ |
3176a0c2 | 3703 | if (STRICT_ALIGNMENT |
3e4093b6 RS |
3704 | && TREE_CODE (type) == POINTER_TYPE |
3705 | && TREE_CODE (otype) == POINTER_TYPE | |
3706 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3707 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
3708 | /* Don't warn about opaque types, where the actual alignment | |
3709 | restriction is unknown. */ | |
3710 | && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE | |
3711 | || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE) | |
3712 | && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode) | |
3713 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
3176a0c2 DD |
3714 | warning (OPT_Wcast_align, |
3715 | "cast increases required alignment of target type"); | |
e9a25f70 | 3716 | |
3176a0c2 | 3717 | if (TREE_CODE (type) == INTEGER_TYPE |
3e4093b6 | 3718 | && TREE_CODE (otype) == POINTER_TYPE |
8d1c7aef | 3719 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) |
c22cacf3 MS |
3720 | /* Unlike conversion of integers to pointers, where the |
3721 | warning is disabled for converting constants because | |
3722 | of cases such as SIG_*, warn about converting constant | |
3723 | pointers to integers. In some cases it may cause unwanted | |
8d1c7aef | 3724 | sign extension, and a warning is appropriate. */ |
3176a0c2 DD |
3725 | warning (OPT_Wpointer_to_int_cast, |
3726 | "cast from pointer to integer of different size"); | |
400fbf9f | 3727 | |
3176a0c2 | 3728 | if (TREE_CODE (value) == CALL_EXPR |
3e4093b6 | 3729 | && TREE_CODE (type) != TREE_CODE (otype)) |
3176a0c2 DD |
3730 | warning (OPT_Wbad_function_cast, "cast from function call of type %qT " |
3731 | "to non-matching type %qT", otype, type); | |
400fbf9f | 3732 | |
3176a0c2 | 3733 | if (TREE_CODE (type) == POINTER_TYPE |
3e4093b6 RS |
3734 | && TREE_CODE (otype) == INTEGER_TYPE |
3735 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
3736 | /* Don't warn about converting any constant. */ | |
3737 | && !TREE_CONSTANT (value)) | |
3176a0c2 DD |
3738 | warning (OPT_Wint_to_pointer_cast, "cast to pointer from integer " |
3739 | "of different size"); | |
400fbf9f | 3740 | |
79bedddc SR |
3741 | if (warn_strict_aliasing <= 2) |
3742 | strict_aliasing_warning (otype, type, expr); | |
400fbf9f | 3743 | |
3897f229 JM |
3744 | /* If pedantic, warn for conversions between function and object |
3745 | pointer types, except for converting a null pointer constant | |
3746 | to function pointer type. */ | |
3747 | if (pedantic | |
3748 | && TREE_CODE (type) == POINTER_TYPE | |
3749 | && TREE_CODE (otype) == POINTER_TYPE | |
3750 | && TREE_CODE (TREE_TYPE (otype)) == FUNCTION_TYPE | |
3751 | && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE) | |
3752 | pedwarn ("ISO C forbids conversion of function pointer to object pointer type"); | |
3753 | ||
3754 | if (pedantic | |
3755 | && TREE_CODE (type) == POINTER_TYPE | |
3756 | && TREE_CODE (otype) == POINTER_TYPE | |
3757 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE | |
3758 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
6aa3c60d | 3759 | && !null_pointer_constant_p (value)) |
3897f229 JM |
3760 | pedwarn ("ISO C forbids conversion of object pointer to function pointer type"); |
3761 | ||
3e4093b6 | 3762 | ovalue = value; |
3e4093b6 | 3763 | value = convert (type, value); |
400fbf9f | 3764 | |
3e4093b6 RS |
3765 | /* Ignore any integer overflow caused by the cast. */ |
3766 | if (TREE_CODE (value) == INTEGER_CST) | |
3767 | { | |
8bcd6380 | 3768 | if (CONSTANT_CLASS_P (ovalue) && TREE_OVERFLOW (ovalue)) |
6414bad6 | 3769 | { |
8bcd6380 RS |
3770 | if (!TREE_OVERFLOW (value)) |
3771 | { | |
3772 | /* Avoid clobbering a shared constant. */ | |
3773 | value = copy_node (value); | |
3774 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
3775 | } | |
6414bad6 | 3776 | } |
8bcd6380 | 3777 | else if (TREE_OVERFLOW (value)) |
d8e1f97b PB |
3778 | /* Reset VALUE's overflow flags, ensuring constant sharing. */ |
3779 | value = build_int_cst_wide (TREE_TYPE (value), | |
3780 | TREE_INT_CST_LOW (value), | |
3781 | TREE_INT_CST_HIGH (value)); | |
3e4093b6 RS |
3782 | } |
3783 | } | |
400fbf9f | 3784 | |
53cd18ec JM |
3785 | /* Don't let a cast be an lvalue. */ |
3786 | if (value == expr) | |
3e4093b6 | 3787 | value = non_lvalue (value); |
e9a25f70 | 3788 | |
3e4093b6 | 3789 | return value; |
400fbf9f JW |
3790 | } |
3791 | ||
3e4093b6 RS |
3792 | /* Interpret a cast of expression EXPR to type TYPE. */ |
3793 | tree | |
f8893e47 | 3794 | c_cast_expr (struct c_type_name *type_name, tree expr) |
400fbf9f | 3795 | { |
f8893e47 | 3796 | tree type; |
3e4093b6 | 3797 | int saved_wsp = warn_strict_prototypes; |
c5c76735 | 3798 | |
3e4093b6 RS |
3799 | /* This avoids warnings about unprototyped casts on |
3800 | integers. E.g. "#define SIG_DFL (void(*)())0". */ | |
3801 | if (TREE_CODE (expr) == INTEGER_CST) | |
3802 | warn_strict_prototypes = 0; | |
f8893e47 | 3803 | type = groktypename (type_name); |
3e4093b6 | 3804 | warn_strict_prototypes = saved_wsp; |
c5c76735 | 3805 | |
3e4093b6 | 3806 | return build_c_cast (type, expr); |
400fbf9f | 3807 | } |
3e4093b6 RS |
3808 | \f |
3809 | /* Build an assignment expression of lvalue LHS from value RHS. | |
3810 | MODIFYCODE is the code for a binary operator that we use | |
3811 | to combine the old value of LHS with RHS to get the new value. | |
3812 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
2f6e4e97 | 3813 | |
3e4093b6 RS |
3814 | tree |
3815 | build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs) | |
400fbf9f | 3816 | { |
3e4093b6 RS |
3817 | tree result; |
3818 | tree newrhs; | |
3819 | tree lhstype = TREE_TYPE (lhs); | |
3820 | tree olhstype = lhstype; | |
e9a25f70 | 3821 | |
3e4093b6 RS |
3822 | /* Types that aren't fully specified cannot be used in assignments. */ |
3823 | lhs = require_complete_type (lhs); | |
e9a25f70 | 3824 | |
3e4093b6 RS |
3825 | /* Avoid duplicate error messages from operands that had errors. */ |
3826 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
3827 | return error_mark_node; | |
400fbf9f | 3828 | |
c0bcacec VR |
3829 | if (!lvalue_or_else (lhs, lv_assign)) |
3830 | return error_mark_node; | |
3831 | ||
ed248cf7 | 3832 | STRIP_TYPE_NOPS (rhs); |
e9a25f70 | 3833 | |
3e4093b6 | 3834 | newrhs = rhs; |
400fbf9f | 3835 | |
3e4093b6 RS |
3836 | /* If a binary op has been requested, combine the old LHS value with the RHS |
3837 | producing the value we should actually store into the LHS. */ | |
3838 | ||
3839 | if (modifycode != NOP_EXPR) | |
400fbf9f | 3840 | { |
3e4093b6 RS |
3841 | lhs = stabilize_reference (lhs); |
3842 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
400fbf9f | 3843 | } |
400fbf9f | 3844 | |
9bf24266 | 3845 | /* Give an error for storing in something that is 'const'. */ |
bbbd6700 | 3846 | |
3e4093b6 RS |
3847 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) |
3848 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
3849 | || TREE_CODE (lhstype) == UNION_TYPE) | |
3850 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
953ff289 DN |
3851 | { |
3852 | readonly_error (lhs, lv_assign); | |
3853 | return error_mark_node; | |
3854 | } | |
bbbd6700 | 3855 | |
3e4093b6 RS |
3856 | /* If storing into a structure or union member, |
3857 | it has probably been given type `int'. | |
3858 | Compute the type that would go with | |
3859 | the actual amount of storage the member occupies. */ | |
bbbd6700 | 3860 | |
3e4093b6 RS |
3861 | if (TREE_CODE (lhs) == COMPONENT_REF |
3862 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
3863 | || TREE_CODE (lhstype) == BOOLEAN_TYPE | |
3864 | || TREE_CODE (lhstype) == REAL_TYPE | |
3865 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
3866 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
400fbf9f | 3867 | |
3e4093b6 RS |
3868 | /* If storing in a field that is in actuality a short or narrower than one, |
3869 | we must store in the field in its actual type. */ | |
3870 | ||
3871 | if (lhstype != TREE_TYPE (lhs)) | |
3872 | { | |
3873 | lhs = copy_node (lhs); | |
3874 | TREE_TYPE (lhs) = lhstype; | |
400fbf9f | 3875 | } |
400fbf9f | 3876 | |
3e4093b6 | 3877 | /* Convert new value to destination type. */ |
400fbf9f | 3878 | |
2ac2f164 | 3879 | newrhs = convert_for_assignment (lhstype, newrhs, ic_assign, |
3e4093b6 RS |
3880 | NULL_TREE, NULL_TREE, 0); |
3881 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
3882 | return error_mark_node; | |
400fbf9f | 3883 | |
6e955430 ZL |
3884 | /* Emit ObjC write barrier, if necessary. */ |
3885 | if (c_dialect_objc () && flag_objc_gc) | |
3886 | { | |
3887 | result = objc_generate_write_barrier (lhs, modifycode, newrhs); | |
3888 | if (result) | |
3889 | return result; | |
3890 | } | |
3891 | ||
ea4b7848 | 3892 | /* Scan operands. */ |
400fbf9f | 3893 | |
53fb4de3 | 3894 | result = build2 (MODIFY_EXPR, lhstype, lhs, newrhs); |
3e4093b6 | 3895 | TREE_SIDE_EFFECTS (result) = 1; |
400fbf9f | 3896 | |
3e4093b6 RS |
3897 | /* If we got the LHS in a different type for storing in, |
3898 | convert the result back to the nominal type of LHS | |
3899 | so that the value we return always has the same type | |
3900 | as the LHS argument. */ | |
e855c5ce | 3901 | |
3e4093b6 RS |
3902 | if (olhstype == TREE_TYPE (result)) |
3903 | return result; | |
2ac2f164 | 3904 | return convert_for_assignment (olhstype, result, ic_assign, |
3e4093b6 RS |
3905 | NULL_TREE, NULL_TREE, 0); |
3906 | } | |
3907 | \f | |
3908 | /* Convert value RHS to type TYPE as preparation for an assignment | |
3909 | to an lvalue of type TYPE. | |
3910 | The real work of conversion is done by `convert'. | |
3911 | The purpose of this function is to generate error messages | |
3912 | for assignments that are not allowed in C. | |
2ac2f164 JM |
3913 | ERRTYPE says whether it is argument passing, assignment, |
3914 | initialization or return. | |
2f6e4e97 | 3915 | |
2ac2f164 | 3916 | FUNCTION is a tree for the function being called. |
3e4093b6 | 3917 | PARMNUM is the number of the argument, for printing in error messages. */ |
cb3ca04e | 3918 | |
3e4093b6 | 3919 | static tree |
2ac2f164 JM |
3920 | convert_for_assignment (tree type, tree rhs, enum impl_conv errtype, |
3921 | tree fundecl, tree function, int parmnum) | |
3e4093b6 RS |
3922 | { |
3923 | enum tree_code codel = TREE_CODE (type); | |
3924 | tree rhstype; | |
3925 | enum tree_code coder; | |
2ac2f164 | 3926 | tree rname = NULL_TREE; |
58393038 | 3927 | bool objc_ok = false; |
2ac2f164 | 3928 | |
6dcc04b0 | 3929 | if (errtype == ic_argpass || errtype == ic_argpass_nonproto) |
2ac2f164 JM |
3930 | { |
3931 | tree selector; | |
3932 | /* Change pointer to function to the function itself for | |
3933 | diagnostics. */ | |
3934 | if (TREE_CODE (function) == ADDR_EXPR | |
3935 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL) | |
3936 | function = TREE_OPERAND (function, 0); | |
3937 | ||
3938 | /* Handle an ObjC selector specially for diagnostics. */ | |
3939 | selector = objc_message_selector (); | |
3940 | rname = function; | |
3941 | if (selector && parmnum > 2) | |
3942 | { | |
3943 | rname = selector; | |
3944 | parmnum -= 2; | |
3945 | } | |
3946 | } | |
3947 | ||
3948 | /* This macro is used to emit diagnostics to ensure that all format | |
3949 | strings are complete sentences, visible to gettext and checked at | |
3950 | compile time. */ | |
3951 | #define WARN_FOR_ASSIGNMENT(AR, AS, IN, RE) \ | |
3952 | do { \ | |
3953 | switch (errtype) \ | |
3954 | { \ | |
3955 | case ic_argpass: \ | |
3956 | pedwarn (AR, parmnum, rname); \ | |
3957 | break; \ | |
6dcc04b0 | 3958 | case ic_argpass_nonproto: \ |
d4ee4d25 | 3959 | warning (0, AR, parmnum, rname); \ |
6dcc04b0 | 3960 | break; \ |
2ac2f164 JM |
3961 | case ic_assign: \ |
3962 | pedwarn (AS); \ | |
3963 | break; \ | |
3964 | case ic_init: \ | |
3965 | pedwarn (IN); \ | |
3966 | break; \ | |
3967 | case ic_return: \ | |
3968 | pedwarn (RE); \ | |
3969 | break; \ | |
3970 | default: \ | |
3971 | gcc_unreachable (); \ | |
3972 | } \ | |
3973 | } while (0) | |
cb3ca04e | 3974 | |
ed248cf7 | 3975 | STRIP_TYPE_NOPS (rhs); |
3e4093b6 | 3976 | |
46bdb9cf JM |
3977 | if (optimize && TREE_CODE (rhs) == VAR_DECL |
3978 | && TREE_CODE (TREE_TYPE (rhs)) != ARRAY_TYPE) | |
3e4093b6 RS |
3979 | rhs = decl_constant_value_for_broken_optimization (rhs); |
3980 | ||
3981 | rhstype = TREE_TYPE (rhs); | |
3982 | coder = TREE_CODE (rhstype); | |
3983 | ||
3984 | if (coder == ERROR_MARK) | |
3985 | return error_mark_node; | |
3986 | ||
58393038 ZL |
3987 | if (c_dialect_objc ()) |
3988 | { | |
3989 | int parmno; | |
3990 | ||
3991 | switch (errtype) | |
3992 | { | |
3993 | case ic_return: | |
3994 | parmno = 0; | |
3995 | break; | |
3996 | ||
3997 | case ic_assign: | |
3998 | parmno = -1; | |
3999 | break; | |
4000 | ||
4001 | case ic_init: | |
4002 | parmno = -2; | |
4003 | break; | |
4004 | ||
4005 | default: | |
4006 | parmno = parmnum; | |
4007 | break; | |
4008 | } | |
4009 | ||
4010 | objc_ok = objc_compare_types (type, rhstype, parmno, rname); | |
4011 | } | |
4012 | ||
3e4093b6 | 4013 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) |
59c0753d | 4014 | return rhs; |
3e4093b6 RS |
4015 | |
4016 | if (coder == VOID_TYPE) | |
400fbf9f | 4017 | { |
6dcc04b0 JM |
4018 | /* Except for passing an argument to an unprototyped function, |
4019 | this is a constraint violation. When passing an argument to | |
4020 | an unprototyped function, it is compile-time undefined; | |
4021 | making it a constraint in that case was rejected in | |
4022 | DR#252. */ | |
3e4093b6 RS |
4023 | error ("void value not ignored as it ought to be"); |
4024 | return error_mark_node; | |
400fbf9f | 4025 | } |
808d6eaa JM |
4026 | rhs = require_complete_type (rhs); |
4027 | if (rhs == error_mark_node) | |
4028 | return error_mark_node; | |
3e4093b6 RS |
4029 | /* A type converts to a reference to it. |
4030 | This code doesn't fully support references, it's just for the | |
4031 | special case of va_start and va_copy. */ | |
4032 | if (codel == REFERENCE_TYPE | |
132da1a5 | 4033 | && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1) |
400fbf9f | 4034 | { |
3e4093b6 | 4035 | if (!lvalue_p (rhs)) |
400fbf9f | 4036 | { |
3e4093b6 RS |
4037 | error ("cannot pass rvalue to reference parameter"); |
4038 | return error_mark_node; | |
400fbf9f | 4039 | } |
3e4093b6 RS |
4040 | if (!c_mark_addressable (rhs)) |
4041 | return error_mark_node; | |
4042 | rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs); | |
4043 | ||
4044 | /* We already know that these two types are compatible, but they | |
4045 | may not be exactly identical. In fact, `TREE_TYPE (type)' is | |
4046 | likely to be __builtin_va_list and `TREE_TYPE (rhs)' is | |
4047 | likely to be va_list, a typedef to __builtin_va_list, which | |
4048 | is different enough that it will cause problems later. */ | |
4049 | if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type)) | |
4050 | rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs); | |
4051 | ||
4052 | rhs = build1 (NOP_EXPR, type, rhs); | |
4053 | return rhs; | |
400fbf9f | 4054 | } |
3e4093b6 | 4055 | /* Some types can interconvert without explicit casts. */ |
3274deff | 4056 | else if (codel == VECTOR_TYPE && coder == VECTOR_TYPE |
00c8e9f6 | 4057 | && vector_types_convertible_p (type, TREE_TYPE (rhs), true)) |
3e4093b6 RS |
4058 | return convert (type, rhs); |
4059 | /* Arithmetic types all interconvert, and enum is treated like int. */ | |
4060 | else if ((codel == INTEGER_TYPE || codel == REAL_TYPE | |
ab22c1fa | 4061 | || codel == FIXED_POINT_TYPE |
3e4093b6 RS |
4062 | || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE |
4063 | || codel == BOOLEAN_TYPE) | |
4064 | && (coder == INTEGER_TYPE || coder == REAL_TYPE | |
ab22c1fa | 4065 | || coder == FIXED_POINT_TYPE |
3e4093b6 RS |
4066 | || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE |
4067 | || coder == BOOLEAN_TYPE)) | |
4068 | return convert_and_check (type, rhs); | |
400fbf9f | 4069 | |
79077aea JJ |
4070 | /* Aggregates in different TUs might need conversion. */ |
4071 | if ((codel == RECORD_TYPE || codel == UNION_TYPE) | |
4072 | && codel == coder | |
4073 | && comptypes (type, rhstype)) | |
4074 | return convert_and_check (type, rhs); | |
4075 | ||
3e4093b6 RS |
4076 | /* Conversion to a transparent union from its member types. |
4077 | This applies only to function arguments. */ | |
79077aea JJ |
4078 | if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) |
4079 | && (errtype == ic_argpass || errtype == ic_argpass_nonproto)) | |
400fbf9f | 4080 | { |
0257e383 | 4081 | tree memb, marginal_memb = NULL_TREE; |
3e4093b6 | 4082 | |
0257e383 | 4083 | for (memb = TYPE_FIELDS (type); memb ; memb = TREE_CHAIN (memb)) |
400fbf9f | 4084 | { |
0257e383 | 4085 | tree memb_type = TREE_TYPE (memb); |
400fbf9f | 4086 | |
3e4093b6 | 4087 | if (comptypes (TYPE_MAIN_VARIANT (memb_type), |
132da1a5 | 4088 | TYPE_MAIN_VARIANT (rhstype))) |
3e4093b6 | 4089 | break; |
e58cd767 | 4090 | |
3e4093b6 RS |
4091 | if (TREE_CODE (memb_type) != POINTER_TYPE) |
4092 | continue; | |
2f6e4e97 | 4093 | |
3e4093b6 RS |
4094 | if (coder == POINTER_TYPE) |
4095 | { | |
4096 | tree ttl = TREE_TYPE (memb_type); | |
4097 | tree ttr = TREE_TYPE (rhstype); | |
400fbf9f | 4098 | |
3e4093b6 RS |
4099 | /* Any non-function converts to a [const][volatile] void * |
4100 | and vice versa; otherwise, targets must be the same. | |
4101 | Meanwhile, the lhs target must have all the qualifiers of | |
4102 | the rhs. */ | |
4103 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
58393038 | 4104 | || comp_target_types (memb_type, rhstype)) |
3e4093b6 RS |
4105 | { |
4106 | /* If this type won't generate any warnings, use it. */ | |
4107 | if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr) | |
4108 | || ((TREE_CODE (ttr) == FUNCTION_TYPE | |
4109 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4110 | ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) | |
4111 | == TYPE_QUALS (ttr)) | |
4112 | : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) | |
4113 | == TYPE_QUALS (ttl)))) | |
4114 | break; | |
400fbf9f | 4115 | |
3e4093b6 | 4116 | /* Keep looking for a better type, but remember this one. */ |
0257e383 RH |
4117 | if (!marginal_memb) |
4118 | marginal_memb = memb; | |
3e4093b6 RS |
4119 | } |
4120 | } | |
82bde854 | 4121 | |
3e4093b6 | 4122 | /* Can convert integer zero to any pointer type. */ |
6aa3c60d | 4123 | if (null_pointer_constant_p (rhs)) |
3e4093b6 RS |
4124 | { |
4125 | rhs = null_pointer_node; | |
4126 | break; | |
4127 | } | |
4128 | } | |
400fbf9f | 4129 | |
0257e383 | 4130 | if (memb || marginal_memb) |
3e4093b6 | 4131 | { |
0257e383 | 4132 | if (!memb) |
3e4093b6 RS |
4133 | { |
4134 | /* We have only a marginally acceptable member type; | |
4135 | it needs a warning. */ | |
0257e383 | 4136 | tree ttl = TREE_TYPE (TREE_TYPE (marginal_memb)); |
3e4093b6 | 4137 | tree ttr = TREE_TYPE (rhstype); |
714a0864 | 4138 | |
3e4093b6 RS |
4139 | /* Const and volatile mean something different for function |
4140 | types, so the usual warnings are not appropriate. */ | |
4141 | if (TREE_CODE (ttr) == FUNCTION_TYPE | |
4142 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4143 | { | |
4144 | /* Because const and volatile on functions are | |
4145 | restrictions that say the function will not do | |
4146 | certain things, it is okay to use a const or volatile | |
4147 | function where an ordinary one is wanted, but not | |
4148 | vice-versa. */ | |
4149 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) | |
4b794eaf | 4150 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE " |
2ac2f164 JM |
4151 | "makes qualified function " |
4152 | "pointer from unqualified"), | |
4b794eaf | 4153 | G_("assignment makes qualified " |
2ac2f164 JM |
4154 | "function pointer from " |
4155 | "unqualified"), | |
4b794eaf | 4156 | G_("initialization makes qualified " |
2ac2f164 JM |
4157 | "function pointer from " |
4158 | "unqualified"), | |
4b794eaf | 4159 | G_("return makes qualified function " |
2ac2f164 | 4160 | "pointer from unqualified")); |
3e4093b6 RS |
4161 | } |
4162 | else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) | |
4b794eaf | 4163 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards " |
2ac2f164 | 4164 | "qualifiers from pointer target type"), |
4b794eaf | 4165 | G_("assignment discards qualifiers " |
2ac2f164 | 4166 | "from pointer target type"), |
4b794eaf | 4167 | G_("initialization discards qualifiers " |
2ac2f164 | 4168 | "from pointer target type"), |
4b794eaf | 4169 | G_("return discards qualifiers from " |
2ac2f164 | 4170 | "pointer target type")); |
0257e383 RH |
4171 | |
4172 | memb = marginal_memb; | |
3e4093b6 | 4173 | } |
400fbf9f | 4174 | |
13b22d3a | 4175 | if (pedantic && (!fundecl || !DECL_IN_SYSTEM_HEADER (fundecl))) |
3e4093b6 | 4176 | pedwarn ("ISO C prohibits argument conversion to union type"); |
0e7c47fa | 4177 | |
ff7637ef | 4178 | rhs = fold_convert (TREE_TYPE (memb), rhs); |
0257e383 | 4179 | return build_constructor_single (type, memb, rhs); |
3e4093b6 | 4180 | } |
0e7c47fa RK |
4181 | } |
4182 | ||
3e4093b6 RS |
4183 | /* Conversions among pointers */ |
4184 | else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE) | |
4185 | && (coder == codel)) | |
400fbf9f | 4186 | { |
3e4093b6 RS |
4187 | tree ttl = TREE_TYPE (type); |
4188 | tree ttr = TREE_TYPE (rhstype); | |
46df2823 JM |
4189 | tree mvl = ttl; |
4190 | tree mvr = ttr; | |
3e4093b6 | 4191 | bool is_opaque_pointer; |
264fa2db | 4192 | int target_cmp = 0; /* Cache comp_target_types () result. */ |
400fbf9f | 4193 | |
46df2823 JM |
4194 | if (TREE_CODE (mvl) != ARRAY_TYPE) |
4195 | mvl = TYPE_MAIN_VARIANT (mvl); | |
4196 | if (TREE_CODE (mvr) != ARRAY_TYPE) | |
4197 | mvr = TYPE_MAIN_VARIANT (mvr); | |
3e4093b6 | 4198 | /* Opaque pointers are treated like void pointers. */ |
5fd9b178 | 4199 | is_opaque_pointer = (targetm.vector_opaque_p (type) |
c22cacf3 MS |
4200 | || targetm.vector_opaque_p (rhstype)) |
4201 | && TREE_CODE (ttl) == VECTOR_TYPE | |
4202 | && TREE_CODE (ttr) == VECTOR_TYPE; | |
4203 | ||
b7e20b53 | 4204 | /* C++ does not allow the implicit conversion void* -> T*. However, |
c22cacf3 MS |
4205 | for the purpose of reducing the number of false positives, we |
4206 | tolerate the special case of | |
b7e20b53 | 4207 | |
c22cacf3 | 4208 | int *p = NULL; |
b7e20b53 | 4209 | |
c22cacf3 | 4210 | where NULL is typically defined in C to be '(void *) 0'. */ |
c6bdf92e | 4211 | if (VOID_TYPE_P (ttr) && rhs != null_pointer_node && !VOID_TYPE_P (ttl)) |
c22cacf3 MS |
4212 | warning (OPT_Wc___compat, "request for implicit conversion from " |
4213 | "%qT to %qT not permitted in C++", rhstype, type); | |
400fbf9f | 4214 | |
7876a414 KG |
4215 | /* Check if the right-hand side has a format attribute but the |
4216 | left-hand side doesn't. */ | |
104f8784 KG |
4217 | if (warn_missing_format_attribute |
4218 | && check_missing_format_attribute (type, rhstype)) | |
c22cacf3 | 4219 | { |
104f8784 KG |
4220 | switch (errtype) |
4221 | { | |
4222 | case ic_argpass: | |
4223 | case ic_argpass_nonproto: | |
4224 | warning (OPT_Wmissing_format_attribute, | |
4225 | "argument %d of %qE might be " | |
4226 | "a candidate for a format attribute", | |
4227 | parmnum, rname); | |
4228 | break; | |
4229 | case ic_assign: | |
4230 | warning (OPT_Wmissing_format_attribute, | |
4231 | "assignment left-hand side might be " | |
4232 | "a candidate for a format attribute"); | |
4233 | break; | |
4234 | case ic_init: | |
4235 | warning (OPT_Wmissing_format_attribute, | |
4236 | "initialization left-hand side might be " | |
4237 | "a candidate for a format attribute"); | |
4238 | break; | |
4239 | case ic_return: | |
4240 | warning (OPT_Wmissing_format_attribute, | |
4241 | "return type might be " | |
4242 | "a candidate for a format attribute"); | |
4243 | break; | |
4244 | default: | |
4245 | gcc_unreachable (); | |
4246 | } | |
7876a414 | 4247 | } |
c22cacf3 | 4248 | |
3e4093b6 RS |
4249 | /* Any non-function converts to a [const][volatile] void * |
4250 | and vice versa; otherwise, targets must be the same. | |
4251 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
4252 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
58393038 | 4253 | || (target_cmp = comp_target_types (type, rhstype)) |
3e4093b6 | 4254 | || is_opaque_pointer |
12753674 RE |
4255 | || (c_common_unsigned_type (mvl) |
4256 | == c_common_unsigned_type (mvr))) | |
3e4093b6 RS |
4257 | { |
4258 | if (pedantic | |
4259 | && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE) | |
4260 | || | |
4261 | (VOID_TYPE_P (ttr) | |
6aa3c60d | 4262 | && !null_pointer_constant_p (rhs) |
3e4093b6 | 4263 | && TREE_CODE (ttl) == FUNCTION_TYPE))) |
4b794eaf | 4264 | WARN_FOR_ASSIGNMENT (G_("ISO C forbids passing argument %d of " |
2ac2f164 JM |
4265 | "%qE between function pointer " |
4266 | "and %<void *%>"), | |
4b794eaf | 4267 | G_("ISO C forbids assignment between " |
2ac2f164 | 4268 | "function pointer and %<void *%>"), |
4b794eaf | 4269 | G_("ISO C forbids initialization between " |
2ac2f164 | 4270 | "function pointer and %<void *%>"), |
4b794eaf | 4271 | G_("ISO C forbids return between function " |
2ac2f164 | 4272 | "pointer and %<void *%>")); |
3e4093b6 RS |
4273 | /* Const and volatile mean something different for function types, |
4274 | so the usual warnings are not appropriate. */ | |
4275 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
4276 | && TREE_CODE (ttl) != FUNCTION_TYPE) | |
4277 | { | |
4278 | if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) | |
58393038 ZL |
4279 | { |
4280 | /* Types differing only by the presence of the 'volatile' | |
4281 | qualifier are acceptable if the 'volatile' has been added | |
4282 | in by the Objective-C EH machinery. */ | |
4283 | if (!objc_type_quals_match (ttl, ttr)) | |
4b794eaf | 4284 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE discards " |
58393038 | 4285 | "qualifiers from pointer target type"), |
4b794eaf | 4286 | G_("assignment discards qualifiers " |
58393038 | 4287 | "from pointer target type"), |
4b794eaf | 4288 | G_("initialization discards qualifiers " |
58393038 | 4289 | "from pointer target type"), |
4b794eaf | 4290 | G_("return discards qualifiers from " |
58393038 ZL |
4291 | "pointer target type")); |
4292 | } | |
3e4093b6 RS |
4293 | /* If this is not a case of ignoring a mismatch in signedness, |
4294 | no warning. */ | |
4295 | else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
264fa2db | 4296 | || target_cmp) |
3e4093b6 RS |
4297 | ; |
4298 | /* If there is a mismatch, do warn. */ | |
f2fd3821 | 4299 | else if (warn_pointer_sign) |
4b794eaf | 4300 | WARN_FOR_ASSIGNMENT (G_("pointer targets in passing argument " |
2ac2f164 | 4301 | "%d of %qE differ in signedness"), |
4b794eaf | 4302 | G_("pointer targets in assignment " |
2ac2f164 | 4303 | "differ in signedness"), |
4b794eaf | 4304 | G_("pointer targets in initialization " |
2ac2f164 | 4305 | "differ in signedness"), |
4b794eaf | 4306 | G_("pointer targets in return differ " |
2ac2f164 | 4307 | "in signedness")); |
3e4093b6 RS |
4308 | } |
4309 | else if (TREE_CODE (ttl) == FUNCTION_TYPE | |
4310 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
4311 | { | |
4312 | /* Because const and volatile on functions are restrictions | |
4313 | that say the function will not do certain things, | |
4314 | it is okay to use a const or volatile function | |
4315 | where an ordinary one is wanted, but not vice-versa. */ | |
4316 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) | |
4b794eaf | 4317 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes " |
2ac2f164 JM |
4318 | "qualified function pointer " |
4319 | "from unqualified"), | |
4b794eaf | 4320 | G_("assignment makes qualified function " |
2ac2f164 | 4321 | "pointer from unqualified"), |
4b794eaf | 4322 | G_("initialization makes qualified " |
2ac2f164 | 4323 | "function pointer from unqualified"), |
4b794eaf | 4324 | G_("return makes qualified function " |
2ac2f164 | 4325 | "pointer from unqualified")); |
3e4093b6 RS |
4326 | } |
4327 | } | |
4328 | else | |
58393038 ZL |
4329 | /* Avoid warning about the volatile ObjC EH puts on decls. */ |
4330 | if (!objc_ok) | |
4b794eaf | 4331 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE from " |
58393038 | 4332 | "incompatible pointer type"), |
4b794eaf JJ |
4333 | G_("assignment from incompatible pointer type"), |
4334 | G_("initialization from incompatible " | |
58393038 | 4335 | "pointer type"), |
4b794eaf | 4336 | G_("return from incompatible pointer type")); |
58393038 | 4337 | |
3e4093b6 RS |
4338 | return convert (type, rhs); |
4339 | } | |
b494fd98 EB |
4340 | else if (codel == POINTER_TYPE && coder == ARRAY_TYPE) |
4341 | { | |
6dcc04b0 JM |
4342 | /* ??? This should not be an error when inlining calls to |
4343 | unprototyped functions. */ | |
b494fd98 EB |
4344 | error ("invalid use of non-lvalue array"); |
4345 | return error_mark_node; | |
4346 | } | |
3e4093b6 | 4347 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) |
400fbf9f | 4348 | { |
3e4093b6 RS |
4349 | /* An explicit constant 0 can convert to a pointer, |
4350 | or one that results from arithmetic, even including | |
4351 | a cast to integer type. */ | |
6aa3c60d | 4352 | if (!null_pointer_constant_p (rhs)) |
4b794eaf | 4353 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes " |
2ac2f164 | 4354 | "pointer from integer without a cast"), |
4b794eaf | 4355 | G_("assignment makes pointer from integer " |
2ac2f164 | 4356 | "without a cast"), |
4b794eaf | 4357 | G_("initialization makes pointer from " |
2ac2f164 | 4358 | "integer without a cast"), |
4b794eaf | 4359 | G_("return makes pointer from integer " |
2ac2f164 | 4360 | "without a cast")); |
b3006337 EB |
4361 | |
4362 | return convert (type, rhs); | |
400fbf9f | 4363 | } |
3e4093b6 | 4364 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) |
400fbf9f | 4365 | { |
4b794eaf | 4366 | WARN_FOR_ASSIGNMENT (G_("passing argument %d of %qE makes integer " |
2ac2f164 | 4367 | "from pointer without a cast"), |
4b794eaf | 4368 | G_("assignment makes integer from pointer " |
2ac2f164 | 4369 | "without a cast"), |
4b794eaf | 4370 | G_("initialization makes integer from pointer " |
2ac2f164 | 4371 | "without a cast"), |
4b794eaf | 4372 | G_("return makes integer from pointer " |
2ac2f164 | 4373 | "without a cast")); |
3e4093b6 RS |
4374 | return convert (type, rhs); |
4375 | } | |
4376 | else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE) | |
4377 | return convert (type, rhs); | |
400fbf9f | 4378 | |
2ac2f164 | 4379 | switch (errtype) |
3e4093b6 | 4380 | { |
2ac2f164 | 4381 | case ic_argpass: |
6dcc04b0 JM |
4382 | case ic_argpass_nonproto: |
4383 | /* ??? This should not be an error when inlining calls to | |
4384 | unprototyped functions. */ | |
2ac2f164 JM |
4385 | error ("incompatible type for argument %d of %qE", parmnum, rname); |
4386 | break; | |
4387 | case ic_assign: | |
4388 | error ("incompatible types in assignment"); | |
4389 | break; | |
4390 | case ic_init: | |
4391 | error ("incompatible types in initialization"); | |
4392 | break; | |
4393 | case ic_return: | |
4394 | error ("incompatible types in return"); | |
4395 | break; | |
4396 | default: | |
4397 | gcc_unreachable (); | |
400fbf9f | 4398 | } |
53b01f59 | 4399 | |
3e4093b6 RS |
4400 | return error_mark_node; |
4401 | } | |
3e4093b6 RS |
4402 | \f |
4403 | /* If VALUE is a compound expr all of whose expressions are constant, then | |
4404 | return its value. Otherwise, return error_mark_node. | |
15b732b2 | 4405 | |
3e4093b6 RS |
4406 | This is for handling COMPOUND_EXPRs as initializer elements |
4407 | which is allowed with a warning when -pedantic is specified. */ | |
15b732b2 | 4408 | |
3e4093b6 RS |
4409 | static tree |
4410 | valid_compound_expr_initializer (tree value, tree endtype) | |
4411 | { | |
4412 | if (TREE_CODE (value) == COMPOUND_EXPR) | |
4413 | { | |
4414 | if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype) | |
4415 | == error_mark_node) | |
4416 | return error_mark_node; | |
4417 | return valid_compound_expr_initializer (TREE_OPERAND (value, 1), | |
4418 | endtype); | |
4419 | } | |
116df786 | 4420 | else if (!initializer_constant_valid_p (value, endtype)) |
3e4093b6 RS |
4421 | return error_mark_node; |
4422 | else | |
4423 | return value; | |
15b732b2 | 4424 | } |
400fbf9f | 4425 | \f |
3e4093b6 RS |
4426 | /* Perform appropriate conversions on the initial value of a variable, |
4427 | store it in the declaration DECL, | |
4428 | and print any error messages that are appropriate. | |
4429 | If the init is invalid, store an ERROR_MARK. */ | |
400fbf9f | 4430 | |
3e4093b6 RS |
4431 | void |
4432 | store_init_value (tree decl, tree init) | |
400fbf9f | 4433 | { |
3e4093b6 | 4434 | tree value, type; |
400fbf9f | 4435 | |
3e4093b6 | 4436 | /* If variable's type was invalidly declared, just ignore it. */ |
400fbf9f | 4437 | |
3e4093b6 RS |
4438 | type = TREE_TYPE (decl); |
4439 | if (TREE_CODE (type) == ERROR_MARK) | |
4440 | return; | |
400fbf9f | 4441 | |
3e4093b6 | 4442 | /* Digest the specified initializer into an expression. */ |
400fbf9f | 4443 | |
916c5919 | 4444 | value = digest_init (type, init, true, TREE_STATIC (decl)); |
400fbf9f | 4445 | |
3e4093b6 | 4446 | /* Store the expression if valid; else report error. */ |
400fbf9f | 4447 | |
3176a0c2 | 4448 | if (!in_system_header |
3f75a254 | 4449 | && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && !TREE_STATIC (decl)) |
3176a0c2 DD |
4450 | warning (OPT_Wtraditional, "traditional C rejects automatic " |
4451 | "aggregate initialization"); | |
2f6e4e97 | 4452 | |
3e4093b6 | 4453 | DECL_INITIAL (decl) = value; |
400fbf9f | 4454 | |
3e4093b6 RS |
4455 | /* ANSI wants warnings about out-of-range constant initializers. */ |
4456 | STRIP_TYPE_NOPS (value); | |
c2658540 MLI |
4457 | if (TREE_STATIC (decl)) |
4458 | constant_expression_warning (value); | |
400fbf9f | 4459 | |
3e4093b6 RS |
4460 | /* Check if we need to set array size from compound literal size. */ |
4461 | if (TREE_CODE (type) == ARRAY_TYPE | |
4462 | && TYPE_DOMAIN (type) == 0 | |
4463 | && value != error_mark_node) | |
400fbf9f | 4464 | { |
3e4093b6 RS |
4465 | tree inside_init = init; |
4466 | ||
ed248cf7 | 4467 | STRIP_TYPE_NOPS (inside_init); |
3e4093b6 RS |
4468 | inside_init = fold (inside_init); |
4469 | ||
4470 | if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
4471 | { | |
8d9f82d5 | 4472 | tree cldecl = COMPOUND_LITERAL_EXPR_DECL (inside_init); |
3e4093b6 | 4473 | |
8d9f82d5 | 4474 | if (TYPE_DOMAIN (TREE_TYPE (cldecl))) |
3e4093b6 RS |
4475 | { |
4476 | /* For int foo[] = (int [3]){1}; we need to set array size | |
4477 | now since later on array initializer will be just the | |
4478 | brace enclosed list of the compound literal. */ | |
8d9f82d5 AO |
4479 | type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); |
4480 | TREE_TYPE (decl) = type; | |
4481 | TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (cldecl)); | |
3e4093b6 | 4482 | layout_type (type); |
8d9f82d5 | 4483 | layout_decl (cldecl, 0); |
3e4093b6 RS |
4484 | } |
4485 | } | |
400fbf9f | 4486 | } |
3e4093b6 RS |
4487 | } |
4488 | \f | |
4489 | /* Methods for storing and printing names for error messages. */ | |
400fbf9f | 4490 | |
3e4093b6 RS |
4491 | /* Implement a spelling stack that allows components of a name to be pushed |
4492 | and popped. Each element on the stack is this structure. */ | |
400fbf9f | 4493 | |
3e4093b6 RS |
4494 | struct spelling |
4495 | { | |
4496 | int kind; | |
4497 | union | |
400fbf9f | 4498 | { |
a0f0ab9f | 4499 | unsigned HOST_WIDE_INT i; |
3e4093b6 RS |
4500 | const char *s; |
4501 | } u; | |
4502 | }; | |
2f6e4e97 | 4503 | |
3e4093b6 RS |
4504 | #define SPELLING_STRING 1 |
4505 | #define SPELLING_MEMBER 2 | |
4506 | #define SPELLING_BOUNDS 3 | |
400fbf9f | 4507 | |
3e4093b6 RS |
4508 | static struct spelling *spelling; /* Next stack element (unused). */ |
4509 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4510 | static int spelling_size; /* Size of the spelling stack. */ | |
400fbf9f | 4511 | |
3e4093b6 RS |
4512 | /* Macros to save and restore the spelling stack around push_... functions. |
4513 | Alternative to SAVE_SPELLING_STACK. */ | |
400fbf9f | 4514 | |
3e4093b6 RS |
4515 | #define SPELLING_DEPTH() (spelling - spelling_base) |
4516 | #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH)) | |
400fbf9f | 4517 | |
3e4093b6 RS |
4518 | /* Push an element on the spelling stack with type KIND and assign VALUE |
4519 | to MEMBER. */ | |
400fbf9f | 4520 | |
3e4093b6 RS |
4521 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ |
4522 | { \ | |
4523 | int depth = SPELLING_DEPTH (); \ | |
4524 | \ | |
4525 | if (depth >= spelling_size) \ | |
4526 | { \ | |
4527 | spelling_size += 10; \ | |
cca8ead2 BI |
4528 | spelling_base = XRESIZEVEC (struct spelling, spelling_base, \ |
4529 | spelling_size); \ | |
3e4093b6 RS |
4530 | RESTORE_SPELLING_DEPTH (depth); \ |
4531 | } \ | |
4532 | \ | |
4533 | spelling->kind = (KIND); \ | |
4534 | spelling->MEMBER = (VALUE); \ | |
4535 | spelling++; \ | |
4536 | } | |
400fbf9f | 4537 | |
3e4093b6 | 4538 | /* Push STRING on the stack. Printed literally. */ |
400fbf9f | 4539 | |
3e4093b6 RS |
4540 | static void |
4541 | push_string (const char *string) | |
4542 | { | |
4543 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4544 | } | |
400fbf9f | 4545 | |
3e4093b6 | 4546 | /* Push a member name on the stack. Printed as '.' STRING. */ |
400fbf9f | 4547 | |
3e4093b6 RS |
4548 | static void |
4549 | push_member_name (tree decl) | |
4550 | { | |
4551 | const char *const string | |
4552 | = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>"; | |
4553 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); | |
4554 | } | |
400fbf9f | 4555 | |
3e4093b6 | 4556 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ |
400fbf9f | 4557 | |
3e4093b6 | 4558 | static void |
a0f0ab9f | 4559 | push_array_bounds (unsigned HOST_WIDE_INT bounds) |
3e4093b6 RS |
4560 | { |
4561 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4562 | } | |
bb58bec5 | 4563 | |
3e4093b6 | 4564 | /* Compute the maximum size in bytes of the printed spelling. */ |
400fbf9f | 4565 | |
3e4093b6 RS |
4566 | static int |
4567 | spelling_length (void) | |
4568 | { | |
4569 | int size = 0; | |
4570 | struct spelling *p; | |
400fbf9f | 4571 | |
3e4093b6 RS |
4572 | for (p = spelling_base; p < spelling; p++) |
4573 | { | |
4574 | if (p->kind == SPELLING_BOUNDS) | |
4575 | size += 25; | |
4576 | else | |
4577 | size += strlen (p->u.s) + 1; | |
4578 | } | |
4579 | ||
4580 | return size; | |
400fbf9f | 4581 | } |
400fbf9f | 4582 | |
3e4093b6 | 4583 | /* Print the spelling to BUFFER and return it. */ |
400fbf9f | 4584 | |
3e4093b6 RS |
4585 | static char * |
4586 | print_spelling (char *buffer) | |
400fbf9f | 4587 | { |
3e4093b6 RS |
4588 | char *d = buffer; |
4589 | struct spelling *p; | |
400fbf9f | 4590 | |
3e4093b6 RS |
4591 | for (p = spelling_base; p < spelling; p++) |
4592 | if (p->kind == SPELLING_BOUNDS) | |
4593 | { | |
a0f0ab9f | 4594 | sprintf (d, "[" HOST_WIDE_INT_PRINT_UNSIGNED "]", p->u.i); |
3e4093b6 RS |
4595 | d += strlen (d); |
4596 | } | |
4597 | else | |
4598 | { | |
4599 | const char *s; | |
4600 | if (p->kind == SPELLING_MEMBER) | |
4601 | *d++ = '.'; | |
4602 | for (s = p->u.s; (*d = *s++); d++) | |
4603 | ; | |
4604 | } | |
4605 | *d++ = '\0'; | |
4606 | return buffer; | |
4607 | } | |
400fbf9f | 4608 | |
3e4093b6 RS |
4609 | /* Issue an error message for a bad initializer component. |
4610 | MSGID identifies the message. | |
4611 | The component name is taken from the spelling stack. */ | |
400fbf9f | 4612 | |
3e4093b6 RS |
4613 | void |
4614 | error_init (const char *msgid) | |
4615 | { | |
4616 | char *ofwhat; | |
400fbf9f | 4617 | |
3e4093b6 | 4618 | error ("%s", _(msgid)); |
28dab132 | 4619 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4620 | if (*ofwhat) |
bda67431 | 4621 | error ("(near initialization for %qs)", ofwhat); |
3e4093b6 | 4622 | } |
400fbf9f | 4623 | |
3e4093b6 RS |
4624 | /* Issue a pedantic warning for a bad initializer component. |
4625 | MSGID identifies the message. | |
4626 | The component name is taken from the spelling stack. */ | |
400fbf9f | 4627 | |
3e4093b6 RS |
4628 | void |
4629 | pedwarn_init (const char *msgid) | |
4630 | { | |
4631 | char *ofwhat; | |
9f720c3e | 4632 | |
3e4093b6 | 4633 | pedwarn ("%s", _(msgid)); |
28dab132 | 4634 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4635 | if (*ofwhat) |
bda67431 | 4636 | pedwarn ("(near initialization for %qs)", ofwhat); |
3e4093b6 | 4637 | } |
9f720c3e | 4638 | |
683d6ff9 MLI |
4639 | /* Issue a warning for a bad initializer component. |
4640 | ||
4641 | OPT is the OPT_W* value corresponding to the warning option that | |
4642 | controls this warning. MSGID identifies the message. The | |
4643 | component name is taken from the spelling stack. */ | |
61179109 | 4644 | |
3e4093b6 | 4645 | static void |
683d6ff9 | 4646 | warning_init (int opt, const char *msgid) |
3e4093b6 RS |
4647 | { |
4648 | char *ofwhat; | |
7e842ef8 | 4649 | |
683d6ff9 | 4650 | warning (opt, "%s", _(msgid)); |
28dab132 | 4651 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4652 | if (*ofwhat) |
683d6ff9 | 4653 | warning (opt, "(near initialization for %qs)", ofwhat); |
3e4093b6 RS |
4654 | } |
4655 | \f | |
916c5919 JM |
4656 | /* If TYPE is an array type and EXPR is a parenthesized string |
4657 | constant, warn if pedantic that EXPR is being used to initialize an | |
4658 | object of type TYPE. */ | |
4659 | ||
4660 | void | |
4661 | maybe_warn_string_init (tree type, struct c_expr expr) | |
4662 | { | |
4663 | if (pedantic | |
4664 | && TREE_CODE (type) == ARRAY_TYPE | |
4665 | && TREE_CODE (expr.value) == STRING_CST | |
4666 | && expr.original_code != STRING_CST) | |
4667 | pedwarn_init ("array initialized from parenthesized string constant"); | |
4668 | } | |
4669 | ||
3e4093b6 RS |
4670 | /* Digest the parser output INIT as an initializer for type TYPE. |
4671 | Return a C expression of type TYPE to represent the initial value. | |
7e842ef8 | 4672 | |
916c5919 JM |
4673 | If INIT is a string constant, STRICT_STRING is true if it is |
4674 | unparenthesized or we should not warn here for it being parenthesized. | |
4675 | For other types of INIT, STRICT_STRING is not used. | |
4676 | ||
3e4093b6 RS |
4677 | REQUIRE_CONSTANT requests an error if non-constant initializers or |
4678 | elements are seen. */ | |
7e842ef8 | 4679 | |
3e4093b6 | 4680 | static tree |
916c5919 | 4681 | digest_init (tree type, tree init, bool strict_string, int require_constant) |
3e4093b6 RS |
4682 | { |
4683 | enum tree_code code = TREE_CODE (type); | |
4684 | tree inside_init = init; | |
7e842ef8 | 4685 | |
3e4093b6 | 4686 | if (type == error_mark_node |
f01da1a5 | 4687 | || !init |
3e4093b6 RS |
4688 | || init == error_mark_node |
4689 | || TREE_TYPE (init) == error_mark_node) | |
4690 | return error_mark_node; | |
7e842ef8 | 4691 | |
ed248cf7 | 4692 | STRIP_TYPE_NOPS (inside_init); |
7e842ef8 | 4693 | |
3e4093b6 | 4694 | inside_init = fold (inside_init); |
7e842ef8 | 4695 | |
3e4093b6 RS |
4696 | /* Initialization of an array of chars from a string constant |
4697 | optionally enclosed in braces. */ | |
7e842ef8 | 4698 | |
197463ae JM |
4699 | if (code == ARRAY_TYPE && inside_init |
4700 | && TREE_CODE (inside_init) == STRING_CST) | |
3e4093b6 RS |
4701 | { |
4702 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
197463ae JM |
4703 | /* Note that an array could be both an array of character type |
4704 | and an array of wchar_t if wchar_t is signed char or unsigned | |
4705 | char. */ | |
4706 | bool char_array = (typ1 == char_type_node | |
4707 | || typ1 == signed_char_type_node | |
4708 | || typ1 == unsigned_char_type_node); | |
4709 | bool wchar_array = !!comptypes (typ1, wchar_type_node); | |
4710 | if (char_array || wchar_array) | |
7e842ef8 | 4711 | { |
916c5919 | 4712 | struct c_expr expr; |
197463ae | 4713 | bool char_string; |
916c5919 JM |
4714 | expr.value = inside_init; |
4715 | expr.original_code = (strict_string ? STRING_CST : ERROR_MARK); | |
4716 | maybe_warn_string_init (type, expr); | |
4717 | ||
197463ae JM |
4718 | char_string |
4719 | = (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) | |
4720 | == char_type_node); | |
4721 | ||
3e4093b6 | 4722 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
132da1a5 | 4723 | TYPE_MAIN_VARIANT (type))) |
3e4093b6 | 4724 | return inside_init; |
7e842ef8 | 4725 | |
197463ae | 4726 | if (!wchar_array && !char_string) |
3e4093b6 RS |
4727 | { |
4728 | error_init ("char-array initialized from wide string"); | |
4729 | return error_mark_node; | |
4730 | } | |
197463ae | 4731 | if (char_string && !char_array) |
3e4093b6 | 4732 | { |
197463ae | 4733 | error_init ("wchar_t-array initialized from non-wide string"); |
3e4093b6 | 4734 | return error_mark_node; |
7e842ef8 | 4735 | } |
2f6e4e97 | 4736 | |
3e4093b6 RS |
4737 | TREE_TYPE (inside_init) = type; |
4738 | if (TYPE_DOMAIN (type) != 0 | |
4739 | && TYPE_SIZE (type) != 0 | |
4740 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
4741 | /* Subtract 1 (or sizeof (wchar_t)) | |
4742 | because it's ok to ignore the terminating null char | |
4743 | that is counted in the length of the constant. */ | |
4744 | && 0 > compare_tree_int (TYPE_SIZE_UNIT (type), | |
4745 | TREE_STRING_LENGTH (inside_init) | |
4746 | - ((TYPE_PRECISION (typ1) | |
4747 | != TYPE_PRECISION (char_type_node)) | |
4748 | ? (TYPE_PRECISION (wchar_type_node) | |
4749 | / BITS_PER_UNIT) | |
4750 | : 1))) | |
4751 | pedwarn_init ("initializer-string for array of chars is too long"); | |
7e842ef8 | 4752 | |
3e4093b6 | 4753 | return inside_init; |
7e842ef8 | 4754 | } |
197463ae JM |
4755 | else if (INTEGRAL_TYPE_P (typ1)) |
4756 | { | |
4757 | error_init ("array of inappropriate type initialized " | |
4758 | "from string constant"); | |
4759 | return error_mark_node; | |
4760 | } | |
7e842ef8 PE |
4761 | } |
4762 | ||
3e4093b6 RS |
4763 | /* Build a VECTOR_CST from a *constant* vector constructor. If the |
4764 | vector constructor is not constant (e.g. {1,2,3,foo()}) then punt | |
4765 | below and handle as a constructor. */ | |
e89be13b JJ |
4766 | if (code == VECTOR_TYPE |
4767 | && TREE_CODE (TREE_TYPE (inside_init)) == VECTOR_TYPE | |
00c8e9f6 | 4768 | && vector_types_convertible_p (TREE_TYPE (inside_init), type, true) |
e89be13b JJ |
4769 | && TREE_CONSTANT (inside_init)) |
4770 | { | |
4771 | if (TREE_CODE (inside_init) == VECTOR_CST | |
4772 | && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), | |
4773 | TYPE_MAIN_VARIANT (type))) | |
4774 | return inside_init; | |
4775 | ||
4776 | if (TREE_CODE (inside_init) == CONSTRUCTOR) | |
4777 | { | |
4038c495 GB |
4778 | unsigned HOST_WIDE_INT ix; |
4779 | tree value; | |
4780 | bool constant_p = true; | |
e89be13b JJ |
4781 | |
4782 | /* Iterate through elements and check if all constructor | |
4783 | elements are *_CSTs. */ | |
4038c495 GB |
4784 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (inside_init), ix, value) |
4785 | if (!CONSTANT_CLASS_P (value)) | |
4786 | { | |
4787 | constant_p = false; | |
4788 | break; | |
4789 | } | |
e89be13b | 4790 | |
4038c495 GB |
4791 | if (constant_p) |
4792 | return build_vector_from_ctor (type, | |
4793 | CONSTRUCTOR_ELTS (inside_init)); | |
e89be13b JJ |
4794 | } |
4795 | } | |
6035d635 | 4796 | |
3e4093b6 RS |
4797 | /* Any type can be initialized |
4798 | from an expression of the same type, optionally with braces. */ | |
400fbf9f | 4799 | |
3e4093b6 RS |
4800 | if (inside_init && TREE_TYPE (inside_init) != 0 |
4801 | && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), | |
132da1a5 | 4802 | TYPE_MAIN_VARIANT (type)) |
3e4093b6 | 4803 | || (code == ARRAY_TYPE |
132da1a5 | 4804 | && comptypes (TREE_TYPE (inside_init), type)) |
3e4093b6 | 4805 | || (code == VECTOR_TYPE |
132da1a5 | 4806 | && comptypes (TREE_TYPE (inside_init), type)) |
3e4093b6 | 4807 | || (code == POINTER_TYPE |
3897f229 | 4808 | && TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
3e4093b6 | 4809 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), |
132da1a5 | 4810 | TREE_TYPE (type))))) |
3e4093b6 RS |
4811 | { |
4812 | if (code == POINTER_TYPE) | |
b494fd98 | 4813 | { |
b494fd98 EB |
4814 | if (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE) |
4815 | { | |
f2a71bbc JM |
4816 | if (TREE_CODE (inside_init) == STRING_CST |
4817 | || TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
4818 | inside_init = array_to_pointer_conversion (inside_init); | |
4819 | else | |
4820 | { | |
4821 | error_init ("invalid use of non-lvalue array"); | |
4822 | return error_mark_node; | |
4823 | } | |
b494fd98 | 4824 | } |
f2a71bbc | 4825 | } |
b494fd98 | 4826 | |
bae39a73 NS |
4827 | if (code == VECTOR_TYPE) |
4828 | /* Although the types are compatible, we may require a | |
4829 | conversion. */ | |
4830 | inside_init = convert (type, inside_init); | |
3e4093b6 | 4831 | |
ca58211b PB |
4832 | if (require_constant |
4833 | && (code == VECTOR_TYPE || !flag_isoc99) | |
3e4093b6 | 4834 | && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) |
400fbf9f | 4835 | { |
3e4093b6 RS |
4836 | /* As an extension, allow initializing objects with static storage |
4837 | duration with compound literals (which are then treated just as | |
ca58211b PB |
4838 | the brace enclosed list they contain). Also allow this for |
4839 | vectors, as we can only assign them with compound literals. */ | |
3e4093b6 RS |
4840 | tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init); |
4841 | inside_init = DECL_INITIAL (decl); | |
400fbf9f | 4842 | } |
3e4093b6 RS |
4843 | |
4844 | if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST | |
4845 | && TREE_CODE (inside_init) != CONSTRUCTOR) | |
400fbf9f | 4846 | { |
3e4093b6 RS |
4847 | error_init ("array initialized from non-constant array expression"); |
4848 | return error_mark_node; | |
400fbf9f | 4849 | } |
400fbf9f | 4850 | |
3e4093b6 RS |
4851 | if (optimize && TREE_CODE (inside_init) == VAR_DECL) |
4852 | inside_init = decl_constant_value_for_broken_optimization (inside_init); | |
2f6e4e97 | 4853 | |
3e4093b6 RS |
4854 | /* Compound expressions can only occur here if -pedantic or |
4855 | -pedantic-errors is specified. In the later case, we always want | |
4856 | an error. In the former case, we simply want a warning. */ | |
4857 | if (require_constant && pedantic | |
4858 | && TREE_CODE (inside_init) == COMPOUND_EXPR) | |
4859 | { | |
4860 | inside_init | |
4861 | = valid_compound_expr_initializer (inside_init, | |
4862 | TREE_TYPE (inside_init)); | |
4863 | if (inside_init == error_mark_node) | |
4864 | error_init ("initializer element is not constant"); | |
2f6e4e97 | 4865 | else |
3e4093b6 RS |
4866 | pedwarn_init ("initializer element is not constant"); |
4867 | if (flag_pedantic_errors) | |
4868 | inside_init = error_mark_node; | |
4869 | } | |
4870 | else if (require_constant | |
116df786 RH |
4871 | && !initializer_constant_valid_p (inside_init, |
4872 | TREE_TYPE (inside_init))) | |
3e4093b6 RS |
4873 | { |
4874 | error_init ("initializer element is not constant"); | |
4875 | inside_init = error_mark_node; | |
8b40563c | 4876 | } |
f735a153 | 4877 | |
8fcef540 KG |
4878 | /* Added to enable additional -Wmissing-format-attribute warnings. */ |
4879 | if (TREE_CODE (TREE_TYPE (inside_init)) == POINTER_TYPE) | |
4880 | inside_init = convert_for_assignment (type, inside_init, ic_init, NULL_TREE, | |
4881 | NULL_TREE, 0); | |
3e4093b6 RS |
4882 | return inside_init; |
4883 | } | |
f735a153 | 4884 | |
3e4093b6 | 4885 | /* Handle scalar types, including conversions. */ |
400fbf9f | 4886 | |
ab22c1fa CF |
4887 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == FIXED_POINT_TYPE |
4888 | || code == POINTER_TYPE || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE | |
4889 | || code == COMPLEX_TYPE || code == VECTOR_TYPE) | |
400fbf9f | 4890 | { |
f2a71bbc JM |
4891 | if (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE |
4892 | && (TREE_CODE (init) == STRING_CST | |
4893 | || TREE_CODE (init) == COMPOUND_LITERAL_EXPR)) | |
4894 | init = array_to_pointer_conversion (init); | |
3e4093b6 | 4895 | inside_init |
2ac2f164 | 4896 | = convert_for_assignment (type, init, ic_init, |
3e4093b6 | 4897 | NULL_TREE, NULL_TREE, 0); |
2f6e4e97 | 4898 | |
3274deff JW |
4899 | /* Check to see if we have already given an error message. */ |
4900 | if (inside_init == error_mark_node) | |
4901 | ; | |
3f75a254 | 4902 | else if (require_constant && !TREE_CONSTANT (inside_init)) |
400fbf9f | 4903 | { |
3e4093b6 RS |
4904 | error_init ("initializer element is not constant"); |
4905 | inside_init = error_mark_node; | |
400fbf9f | 4906 | } |
3e4093b6 | 4907 | else if (require_constant |
116df786 RH |
4908 | && !initializer_constant_valid_p (inside_init, |
4909 | TREE_TYPE (inside_init))) | |
400fbf9f | 4910 | { |
3e4093b6 RS |
4911 | error_init ("initializer element is not computable at load time"); |
4912 | inside_init = error_mark_node; | |
400fbf9f | 4913 | } |
3e4093b6 RS |
4914 | |
4915 | return inside_init; | |
400fbf9f | 4916 | } |
d9fc6069 | 4917 | |
3e4093b6 | 4918 | /* Come here only for records and arrays. */ |
d9fc6069 | 4919 | |
3e4093b6 | 4920 | if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) |
d9fc6069 | 4921 | { |
3e4093b6 RS |
4922 | error_init ("variable-sized object may not be initialized"); |
4923 | return error_mark_node; | |
d9fc6069 | 4924 | } |
3e4093b6 RS |
4925 | |
4926 | error_init ("invalid initializer"); | |
4927 | return error_mark_node; | |
d9fc6069 | 4928 | } |
400fbf9f | 4929 | \f |
3e4093b6 | 4930 | /* Handle initializers that use braces. */ |
400fbf9f | 4931 | |
3e4093b6 RS |
4932 | /* Type of object we are accumulating a constructor for. |
4933 | This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */ | |
4934 | static tree constructor_type; | |
400fbf9f | 4935 | |
3e4093b6 RS |
4936 | /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields |
4937 | left to fill. */ | |
4938 | static tree constructor_fields; | |
400fbf9f | 4939 | |
3e4093b6 RS |
4940 | /* For an ARRAY_TYPE, this is the specified index |
4941 | at which to store the next element we get. */ | |
4942 | static tree constructor_index; | |
400fbf9f | 4943 | |
3e4093b6 RS |
4944 | /* For an ARRAY_TYPE, this is the maximum index. */ |
4945 | static tree constructor_max_index; | |
400fbf9f | 4946 | |
3e4093b6 RS |
4947 | /* For a RECORD_TYPE, this is the first field not yet written out. */ |
4948 | static tree constructor_unfilled_fields; | |
400fbf9f | 4949 | |
3e4093b6 RS |
4950 | /* For an ARRAY_TYPE, this is the index of the first element |
4951 | not yet written out. */ | |
4952 | static tree constructor_unfilled_index; | |
895ea614 | 4953 | |
3e4093b6 RS |
4954 | /* In a RECORD_TYPE, the byte index of the next consecutive field. |
4955 | This is so we can generate gaps between fields, when appropriate. */ | |
4956 | static tree constructor_bit_index; | |
10d5caec | 4957 | |
3e4093b6 RS |
4958 | /* If we are saving up the elements rather than allocating them, |
4959 | this is the list of elements so far (in reverse order, | |
4960 | most recent first). */ | |
4038c495 | 4961 | static VEC(constructor_elt,gc) *constructor_elements; |
ad47f1e5 | 4962 | |
3e4093b6 RS |
4963 | /* 1 if constructor should be incrementally stored into a constructor chain, |
4964 | 0 if all the elements should be kept in AVL tree. */ | |
4965 | static int constructor_incremental; | |
ad47f1e5 | 4966 | |
3e4093b6 RS |
4967 | /* 1 if so far this constructor's elements are all compile-time constants. */ |
4968 | static int constructor_constant; | |
ad47f1e5 | 4969 | |
3e4093b6 RS |
4970 | /* 1 if so far this constructor's elements are all valid address constants. */ |
4971 | static int constructor_simple; | |
ad47f1e5 | 4972 | |
3e4093b6 RS |
4973 | /* 1 if this constructor is erroneous so far. */ |
4974 | static int constructor_erroneous; | |
d45cf215 | 4975 | |
3e4093b6 RS |
4976 | /* Structure for managing pending initializer elements, organized as an |
4977 | AVL tree. */ | |
d45cf215 | 4978 | |
3e4093b6 | 4979 | struct init_node |
d45cf215 | 4980 | { |
3e4093b6 RS |
4981 | struct init_node *left, *right; |
4982 | struct init_node *parent; | |
4983 | int balance; | |
4984 | tree purpose; | |
4985 | tree value; | |
d45cf215 RS |
4986 | }; |
4987 | ||
3e4093b6 RS |
4988 | /* Tree of pending elements at this constructor level. |
4989 | These are elements encountered out of order | |
4990 | which belong at places we haven't reached yet in actually | |
4991 | writing the output. | |
4992 | Will never hold tree nodes across GC runs. */ | |
4993 | static struct init_node *constructor_pending_elts; | |
d45cf215 | 4994 | |
3e4093b6 RS |
4995 | /* The SPELLING_DEPTH of this constructor. */ |
4996 | static int constructor_depth; | |
d45cf215 | 4997 | |
3e4093b6 RS |
4998 | /* DECL node for which an initializer is being read. |
4999 | 0 means we are reading a constructor expression | |
5000 | such as (struct foo) {...}. */ | |
5001 | static tree constructor_decl; | |
d45cf215 | 5002 | |
3e4093b6 RS |
5003 | /* Nonzero if this is an initializer for a top-level decl. */ |
5004 | static int constructor_top_level; | |
d45cf215 | 5005 | |
3e4093b6 RS |
5006 | /* Nonzero if there were any member designators in this initializer. */ |
5007 | static int constructor_designated; | |
d45cf215 | 5008 | |
3e4093b6 RS |
5009 | /* Nesting depth of designator list. */ |
5010 | static int designator_depth; | |
d45cf215 | 5011 | |
3e4093b6 | 5012 | /* Nonzero if there were diagnosed errors in this designator list. */ |
b06df647 | 5013 | static int designator_erroneous; |
d45cf215 | 5014 | |
3e4093b6 RS |
5015 | \f |
5016 | /* This stack has a level for each implicit or explicit level of | |
5017 | structuring in the initializer, including the outermost one. It | |
5018 | saves the values of most of the variables above. */ | |
d45cf215 | 5019 | |
3e4093b6 RS |
5020 | struct constructor_range_stack; |
5021 | ||
5022 | struct constructor_stack | |
d45cf215 | 5023 | { |
3e4093b6 RS |
5024 | struct constructor_stack *next; |
5025 | tree type; | |
5026 | tree fields; | |
5027 | tree index; | |
5028 | tree max_index; | |
5029 | tree unfilled_index; | |
5030 | tree unfilled_fields; | |
5031 | tree bit_index; | |
4038c495 | 5032 | VEC(constructor_elt,gc) *elements; |
3e4093b6 RS |
5033 | struct init_node *pending_elts; |
5034 | int offset; | |
5035 | int depth; | |
916c5919 | 5036 | /* If value nonzero, this value should replace the entire |
3e4093b6 | 5037 | constructor at this level. */ |
916c5919 | 5038 | struct c_expr replacement_value; |
3e4093b6 RS |
5039 | struct constructor_range_stack *range_stack; |
5040 | char constant; | |
5041 | char simple; | |
5042 | char implicit; | |
5043 | char erroneous; | |
5044 | char outer; | |
5045 | char incremental; | |
5046 | char designated; | |
5047 | }; | |
d45cf215 | 5048 | |
802415d1 | 5049 | static struct constructor_stack *constructor_stack; |
d45cf215 | 5050 | |
3e4093b6 RS |
5051 | /* This stack represents designators from some range designator up to |
5052 | the last designator in the list. */ | |
d45cf215 | 5053 | |
3e4093b6 RS |
5054 | struct constructor_range_stack |
5055 | { | |
5056 | struct constructor_range_stack *next, *prev; | |
5057 | struct constructor_stack *stack; | |
5058 | tree range_start; | |
5059 | tree index; | |
5060 | tree range_end; | |
5061 | tree fields; | |
5062 | }; | |
d45cf215 | 5063 | |
802415d1 | 5064 | static struct constructor_range_stack *constructor_range_stack; |
d45cf215 | 5065 | |
3e4093b6 RS |
5066 | /* This stack records separate initializers that are nested. |
5067 | Nested initializers can't happen in ANSI C, but GNU C allows them | |
5068 | in cases like { ... (struct foo) { ... } ... }. */ | |
d45cf215 | 5069 | |
3e4093b6 | 5070 | struct initializer_stack |
d45cf215 | 5071 | { |
3e4093b6 RS |
5072 | struct initializer_stack *next; |
5073 | tree decl; | |
3e4093b6 RS |
5074 | struct constructor_stack *constructor_stack; |
5075 | struct constructor_range_stack *constructor_range_stack; | |
4038c495 | 5076 | VEC(constructor_elt,gc) *elements; |
3e4093b6 RS |
5077 | struct spelling *spelling; |
5078 | struct spelling *spelling_base; | |
5079 | int spelling_size; | |
5080 | char top_level; | |
5081 | char require_constant_value; | |
5082 | char require_constant_elements; | |
5083 | }; | |
d45cf215 | 5084 | |
802415d1 | 5085 | static struct initializer_stack *initializer_stack; |
3e4093b6 RS |
5086 | \f |
5087 | /* Prepare to parse and output the initializer for variable DECL. */ | |
400fbf9f JW |
5088 | |
5089 | void | |
a396f8ae | 5090 | start_init (tree decl, tree asmspec_tree ATTRIBUTE_UNUSED, int top_level) |
400fbf9f | 5091 | { |
3e4093b6 | 5092 | const char *locus; |
cceb1885 | 5093 | struct initializer_stack *p = XNEW (struct initializer_stack); |
400fbf9f | 5094 | |
3e4093b6 | 5095 | p->decl = constructor_decl; |
3e4093b6 RS |
5096 | p->require_constant_value = require_constant_value; |
5097 | p->require_constant_elements = require_constant_elements; | |
5098 | p->constructor_stack = constructor_stack; | |
5099 | p->constructor_range_stack = constructor_range_stack; | |
5100 | p->elements = constructor_elements; | |
5101 | p->spelling = spelling; | |
5102 | p->spelling_base = spelling_base; | |
5103 | p->spelling_size = spelling_size; | |
5104 | p->top_level = constructor_top_level; | |
5105 | p->next = initializer_stack; | |
5106 | initializer_stack = p; | |
400fbf9f | 5107 | |
3e4093b6 | 5108 | constructor_decl = decl; |
3e4093b6 RS |
5109 | constructor_designated = 0; |
5110 | constructor_top_level = top_level; | |
400fbf9f | 5111 | |
6f17bbcf | 5112 | if (decl != 0 && decl != error_mark_node) |
3e4093b6 RS |
5113 | { |
5114 | require_constant_value = TREE_STATIC (decl); | |
5115 | require_constant_elements | |
5116 | = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99)) | |
5117 | /* For a scalar, you can always use any value to initialize, | |
5118 | even within braces. */ | |
5119 | && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
5120 | || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
5121 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
5122 | || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE)); | |
5123 | locus = IDENTIFIER_POINTER (DECL_NAME (decl)); | |
5124 | } | |
5125 | else | |
5126 | { | |
5127 | require_constant_value = 0; | |
5128 | require_constant_elements = 0; | |
5129 | locus = "(anonymous)"; | |
5130 | } | |
b71c7f8a | 5131 | |
3e4093b6 RS |
5132 | constructor_stack = 0; |
5133 | constructor_range_stack = 0; | |
b71c7f8a | 5134 | |
3e4093b6 RS |
5135 | missing_braces_mentioned = 0; |
5136 | ||
5137 | spelling_base = 0; | |
5138 | spelling_size = 0; | |
5139 | RESTORE_SPELLING_DEPTH (0); | |
5140 | ||
5141 | if (locus) | |
5142 | push_string (locus); | |
5143 | } | |
5144 | ||
5145 | void | |
5146 | finish_init (void) | |
b71c7f8a | 5147 | { |
3e4093b6 | 5148 | struct initializer_stack *p = initializer_stack; |
b71c7f8a | 5149 | |
3e4093b6 RS |
5150 | /* Free the whole constructor stack of this initializer. */ |
5151 | while (constructor_stack) | |
5152 | { | |
5153 | struct constructor_stack *q = constructor_stack; | |
5154 | constructor_stack = q->next; | |
5155 | free (q); | |
5156 | } | |
5157 | ||
366de0ce | 5158 | gcc_assert (!constructor_range_stack); |
3e4093b6 RS |
5159 | |
5160 | /* Pop back to the data of the outer initializer (if any). */ | |
36579663 | 5161 | free (spelling_base); |
3aeb3655 | 5162 | |
3e4093b6 | 5163 | constructor_decl = p->decl; |
3e4093b6 RS |
5164 | require_constant_value = p->require_constant_value; |
5165 | require_constant_elements = p->require_constant_elements; | |
5166 | constructor_stack = p->constructor_stack; | |
5167 | constructor_range_stack = p->constructor_range_stack; | |
5168 | constructor_elements = p->elements; | |
5169 | spelling = p->spelling; | |
5170 | spelling_base = p->spelling_base; | |
5171 | spelling_size = p->spelling_size; | |
5172 | constructor_top_level = p->top_level; | |
5173 | initializer_stack = p->next; | |
5174 | free (p); | |
b71c7f8a | 5175 | } |
400fbf9f | 5176 | \f |
3e4093b6 RS |
5177 | /* Call here when we see the initializer is surrounded by braces. |
5178 | This is instead of a call to push_init_level; | |
5179 | it is matched by a call to pop_init_level. | |
400fbf9f | 5180 | |
3e4093b6 RS |
5181 | TYPE is the type to initialize, for a constructor expression. |
5182 | For an initializer for a decl, TYPE is zero. */ | |
400fbf9f | 5183 | |
3e4093b6 RS |
5184 | void |
5185 | really_start_incremental_init (tree type) | |
400fbf9f | 5186 | { |
5d038c4c | 5187 | struct constructor_stack *p = XNEW (struct constructor_stack); |
400fbf9f | 5188 | |
3e4093b6 RS |
5189 | if (type == 0) |
5190 | type = TREE_TYPE (constructor_decl); | |
400fbf9f | 5191 | |
5fd9b178 | 5192 | if (targetm.vector_opaque_p (type)) |
3e4093b6 | 5193 | error ("opaque vector types cannot be initialized"); |
400fbf9f | 5194 | |
3e4093b6 RS |
5195 | p->type = constructor_type; |
5196 | p->fields = constructor_fields; | |
5197 | p->index = constructor_index; | |
5198 | p->max_index = constructor_max_index; | |
5199 | p->unfilled_index = constructor_unfilled_index; | |
5200 | p->unfilled_fields = constructor_unfilled_fields; | |
5201 | p->bit_index = constructor_bit_index; | |
5202 | p->elements = constructor_elements; | |
5203 | p->constant = constructor_constant; | |
5204 | p->simple = constructor_simple; | |
5205 | p->erroneous = constructor_erroneous; | |
5206 | p->pending_elts = constructor_pending_elts; | |
5207 | p->depth = constructor_depth; | |
916c5919 JM |
5208 | p->replacement_value.value = 0; |
5209 | p->replacement_value.original_code = ERROR_MARK; | |
3e4093b6 RS |
5210 | p->implicit = 0; |
5211 | p->range_stack = 0; | |
5212 | p->outer = 0; | |
5213 | p->incremental = constructor_incremental; | |
5214 | p->designated = constructor_designated; | |
5215 | p->next = 0; | |
5216 | constructor_stack = p; | |
b13aca19 | 5217 | |
3e4093b6 RS |
5218 | constructor_constant = 1; |
5219 | constructor_simple = 1; | |
5220 | constructor_depth = SPELLING_DEPTH (); | |
5221 | constructor_elements = 0; | |
5222 | constructor_pending_elts = 0; | |
5223 | constructor_type = type; | |
5224 | constructor_incremental = 1; | |
5225 | constructor_designated = 0; | |
5226 | designator_depth = 0; | |
b06df647 | 5227 | designator_erroneous = 0; |
400fbf9f | 5228 | |
3e4093b6 RS |
5229 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5230 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
400fbf9f | 5231 | { |
3e4093b6 RS |
5232 | constructor_fields = TYPE_FIELDS (constructor_type); |
5233 | /* Skip any nameless bit fields at the beginning. */ | |
5234 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) | |
5235 | && DECL_NAME (constructor_fields) == 0) | |
5236 | constructor_fields = TREE_CHAIN (constructor_fields); | |
05bccae2 | 5237 | |
3e4093b6 RS |
5238 | constructor_unfilled_fields = constructor_fields; |
5239 | constructor_bit_index = bitsize_zero_node; | |
400fbf9f | 5240 | } |
3e4093b6 RS |
5241 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
5242 | { | |
5243 | if (TYPE_DOMAIN (constructor_type)) | |
5244 | { | |
5245 | constructor_max_index | |
5246 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
400fbf9f | 5247 | |
3e4093b6 RS |
5248 | /* Detect non-empty initializations of zero-length arrays. */ |
5249 | if (constructor_max_index == NULL_TREE | |
5250 | && TYPE_SIZE (constructor_type)) | |
7d60be94 | 5251 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
400fbf9f | 5252 | |
3e4093b6 RS |
5253 | /* constructor_max_index needs to be an INTEGER_CST. Attempts |
5254 | to initialize VLAs will cause a proper error; avoid tree | |
5255 | checking errors as well by setting a safe value. */ | |
5256 | if (constructor_max_index | |
5257 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
7d60be94 | 5258 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
59c83dbf | 5259 | |
3e4093b6 RS |
5260 | constructor_index |
5261 | = convert (bitsizetype, | |
5262 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
59c83dbf | 5263 | } |
3e4093b6 | 5264 | else |
493179da JM |
5265 | { |
5266 | constructor_index = bitsize_zero_node; | |
5267 | constructor_max_index = NULL_TREE; | |
5268 | } | |
59c83dbf | 5269 | |
3e4093b6 RS |
5270 | constructor_unfilled_index = constructor_index; |
5271 | } | |
5272 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
5273 | { | |
5274 | /* Vectors are like simple fixed-size arrays. */ | |
5275 | constructor_max_index = | |
7d60be94 | 5276 | build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1); |
a0f0ab9f | 5277 | constructor_index = bitsize_zero_node; |
3e4093b6 RS |
5278 | constructor_unfilled_index = constructor_index; |
5279 | } | |
5280 | else | |
5281 | { | |
5282 | /* Handle the case of int x = {5}; */ | |
5283 | constructor_fields = constructor_type; | |
5284 | constructor_unfilled_fields = constructor_type; | |
5285 | } | |
5286 | } | |
5287 | \f | |
5288 | /* Push down into a subobject, for initialization. | |
5289 | If this is for an explicit set of braces, IMPLICIT is 0. | |
5290 | If it is because the next element belongs at a lower level, | |
5291 | IMPLICIT is 1 (or 2 if the push is because of designator list). */ | |
400fbf9f | 5292 | |
3e4093b6 RS |
5293 | void |
5294 | push_init_level (int implicit) | |
5295 | { | |
5296 | struct constructor_stack *p; | |
5297 | tree value = NULL_TREE; | |
400fbf9f | 5298 | |
3e4093b6 | 5299 | /* If we've exhausted any levels that didn't have braces, |
472d98b4 JM |
5300 | pop them now. If implicit == 1, this will have been done in |
5301 | process_init_element; do not repeat it here because in the case | |
5302 | of excess initializers for an empty aggregate this leads to an | |
5303 | infinite cycle of popping a level and immediately recreating | |
5304 | it. */ | |
5305 | if (implicit != 1) | |
3e4093b6 | 5306 | { |
472d98b4 JM |
5307 | while (constructor_stack->implicit) |
5308 | { | |
5309 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5310 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5311 | && constructor_fields == 0) | |
5312 | process_init_element (pop_init_level (1)); | |
5313 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5314 | && constructor_max_index | |
5315 | && tree_int_cst_lt (constructor_max_index, | |
5316 | constructor_index)) | |
5317 | process_init_element (pop_init_level (1)); | |
5318 | else | |
5319 | break; | |
5320 | } | |
3e4093b6 | 5321 | } |
400fbf9f | 5322 | |
3e4093b6 RS |
5323 | /* Unless this is an explicit brace, we need to preserve previous |
5324 | content if any. */ | |
5325 | if (implicit) | |
5326 | { | |
5327 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5328 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5329 | && constructor_fields) | |
5330 | value = find_init_member (constructor_fields); | |
5331 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5332 | value = find_init_member (constructor_index); | |
400fbf9f JW |
5333 | } |
5334 | ||
5d038c4c | 5335 | p = XNEW (struct constructor_stack); |
3e4093b6 RS |
5336 | p->type = constructor_type; |
5337 | p->fields = constructor_fields; | |
5338 | p->index = constructor_index; | |
5339 | p->max_index = constructor_max_index; | |
5340 | p->unfilled_index = constructor_unfilled_index; | |
5341 | p->unfilled_fields = constructor_unfilled_fields; | |
5342 | p->bit_index = constructor_bit_index; | |
5343 | p->elements = constructor_elements; | |
5344 | p->constant = constructor_constant; | |
5345 | p->simple = constructor_simple; | |
5346 | p->erroneous = constructor_erroneous; | |
5347 | p->pending_elts = constructor_pending_elts; | |
5348 | p->depth = constructor_depth; | |
916c5919 JM |
5349 | p->replacement_value.value = 0; |
5350 | p->replacement_value.original_code = ERROR_MARK; | |
3e4093b6 RS |
5351 | p->implicit = implicit; |
5352 | p->outer = 0; | |
5353 | p->incremental = constructor_incremental; | |
5354 | p->designated = constructor_designated; | |
5355 | p->next = constructor_stack; | |
5356 | p->range_stack = 0; | |
5357 | constructor_stack = p; | |
400fbf9f | 5358 | |
3e4093b6 RS |
5359 | constructor_constant = 1; |
5360 | constructor_simple = 1; | |
5361 | constructor_depth = SPELLING_DEPTH (); | |
5362 | constructor_elements = 0; | |
5363 | constructor_incremental = 1; | |
5364 | constructor_designated = 0; | |
5365 | constructor_pending_elts = 0; | |
5366 | if (!implicit) | |
400fbf9f | 5367 | { |
3e4093b6 RS |
5368 | p->range_stack = constructor_range_stack; |
5369 | constructor_range_stack = 0; | |
5370 | designator_depth = 0; | |
b06df647 | 5371 | designator_erroneous = 0; |
3e4093b6 | 5372 | } |
400fbf9f | 5373 | |
3e4093b6 RS |
5374 | /* Don't die if an entire brace-pair level is superfluous |
5375 | in the containing level. */ | |
5376 | if (constructor_type == 0) | |
5377 | ; | |
5378 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5379 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5380 | { | |
5381 | /* Don't die if there are extra init elts at the end. */ | |
5382 | if (constructor_fields == 0) | |
5383 | constructor_type = 0; | |
5384 | else | |
400fbf9f | 5385 | { |
3e4093b6 RS |
5386 | constructor_type = TREE_TYPE (constructor_fields); |
5387 | push_member_name (constructor_fields); | |
5388 | constructor_depth++; | |
400fbf9f | 5389 | } |
3e4093b6 RS |
5390 | } |
5391 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5392 | { | |
5393 | constructor_type = TREE_TYPE (constructor_type); | |
a0f0ab9f | 5394 | push_array_bounds (tree_low_cst (constructor_index, 1)); |
3e4093b6 | 5395 | constructor_depth++; |
400fbf9f JW |
5396 | } |
5397 | ||
3e4093b6 | 5398 | if (constructor_type == 0) |
400fbf9f | 5399 | { |
3e4093b6 RS |
5400 | error_init ("extra brace group at end of initializer"); |
5401 | constructor_fields = 0; | |
5402 | constructor_unfilled_fields = 0; | |
5403 | return; | |
400fbf9f JW |
5404 | } |
5405 | ||
3e4093b6 RS |
5406 | if (value && TREE_CODE (value) == CONSTRUCTOR) |
5407 | { | |
5408 | constructor_constant = TREE_CONSTANT (value); | |
5409 | constructor_simple = TREE_STATIC (value); | |
5410 | constructor_elements = CONSTRUCTOR_ELTS (value); | |
4038c495 | 5411 | if (!VEC_empty (constructor_elt, constructor_elements) |
3e4093b6 RS |
5412 | && (TREE_CODE (constructor_type) == RECORD_TYPE |
5413 | || TREE_CODE (constructor_type) == ARRAY_TYPE)) | |
5414 | set_nonincremental_init (); | |
5415 | } | |
400fbf9f | 5416 | |
3e4093b6 RS |
5417 | if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned) |
5418 | { | |
5419 | missing_braces_mentioned = 1; | |
683d6ff9 | 5420 | warning_init (OPT_Wmissing_braces, "missing braces around initializer"); |
3e4093b6 | 5421 | } |
400fbf9f | 5422 | |
3e4093b6 RS |
5423 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5424 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5425 | { | |
5426 | constructor_fields = TYPE_FIELDS (constructor_type); | |
5427 | /* Skip any nameless bit fields at the beginning. */ | |
5428 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) | |
5429 | && DECL_NAME (constructor_fields) == 0) | |
5430 | constructor_fields = TREE_CHAIN (constructor_fields); | |
103b7b17 | 5431 | |
3e4093b6 RS |
5432 | constructor_unfilled_fields = constructor_fields; |
5433 | constructor_bit_index = bitsize_zero_node; | |
5434 | } | |
5435 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
5436 | { | |
5437 | /* Vectors are like simple fixed-size arrays. */ | |
5438 | constructor_max_index = | |
7d60be94 | 5439 | build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1); |
3e4093b6 RS |
5440 | constructor_index = convert (bitsizetype, integer_zero_node); |
5441 | constructor_unfilled_index = constructor_index; | |
5442 | } | |
5443 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5444 | { | |
5445 | if (TYPE_DOMAIN (constructor_type)) | |
5446 | { | |
5447 | constructor_max_index | |
5448 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
400fbf9f | 5449 | |
3e4093b6 RS |
5450 | /* Detect non-empty initializations of zero-length arrays. */ |
5451 | if (constructor_max_index == NULL_TREE | |
5452 | && TYPE_SIZE (constructor_type)) | |
7d60be94 | 5453 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
de520661 | 5454 | |
3e4093b6 RS |
5455 | /* constructor_max_index needs to be an INTEGER_CST. Attempts |
5456 | to initialize VLAs will cause a proper error; avoid tree | |
5457 | checking errors as well by setting a safe value. */ | |
5458 | if (constructor_max_index | |
5459 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
7d60be94 | 5460 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
b62acd60 | 5461 | |
3e4093b6 RS |
5462 | constructor_index |
5463 | = convert (bitsizetype, | |
5464 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5465 | } | |
5466 | else | |
5467 | constructor_index = bitsize_zero_node; | |
de520661 | 5468 | |
3e4093b6 RS |
5469 | constructor_unfilled_index = constructor_index; |
5470 | if (value && TREE_CODE (value) == STRING_CST) | |
5471 | { | |
5472 | /* We need to split the char/wchar array into individual | |
5473 | characters, so that we don't have to special case it | |
5474 | everywhere. */ | |
5475 | set_nonincremental_init_from_string (value); | |
5476 | } | |
5477 | } | |
5478 | else | |
5479 | { | |
b4519d39 | 5480 | if (constructor_type != error_mark_node) |
683d6ff9 | 5481 | warning_init (0, "braces around scalar initializer"); |
3e4093b6 RS |
5482 | constructor_fields = constructor_type; |
5483 | constructor_unfilled_fields = constructor_type; | |
5484 | } | |
5485 | } | |
8b6a5902 | 5486 | |
3e4093b6 | 5487 | /* At the end of an implicit or explicit brace level, |
916c5919 JM |
5488 | finish up that level of constructor. If a single expression |
5489 | with redundant braces initialized that level, return the | |
5490 | c_expr structure for that expression. Otherwise, the original_code | |
5491 | element is set to ERROR_MARK. | |
5492 | If we were outputting the elements as they are read, return 0 as the value | |
3e4093b6 | 5493 | from inner levels (process_init_element ignores that), |
916c5919 | 5494 | but return error_mark_node as the value from the outermost level |
3e4093b6 | 5495 | (that's what we want to put in DECL_INITIAL). |
916c5919 | 5496 | Otherwise, return a CONSTRUCTOR expression as the value. */ |
de520661 | 5497 | |
916c5919 | 5498 | struct c_expr |
3e4093b6 RS |
5499 | pop_init_level (int implicit) |
5500 | { | |
5501 | struct constructor_stack *p; | |
916c5919 JM |
5502 | struct c_expr ret; |
5503 | ret.value = 0; | |
5504 | ret.original_code = ERROR_MARK; | |
de520661 | 5505 | |
3e4093b6 RS |
5506 | if (implicit == 0) |
5507 | { | |
5508 | /* When we come to an explicit close brace, | |
5509 | pop any inner levels that didn't have explicit braces. */ | |
5510 | while (constructor_stack->implicit) | |
5511 | process_init_element (pop_init_level (1)); | |
de520661 | 5512 | |
366de0ce | 5513 | gcc_assert (!constructor_range_stack); |
3e4093b6 | 5514 | } |
e5e809f4 | 5515 | |
0066ef9c RH |
5516 | /* Now output all pending elements. */ |
5517 | constructor_incremental = 1; | |
5518 | output_pending_init_elements (1); | |
5519 | ||
3e4093b6 | 5520 | p = constructor_stack; |
e5e809f4 | 5521 | |
3e4093b6 RS |
5522 | /* Error for initializing a flexible array member, or a zero-length |
5523 | array member in an inappropriate context. */ | |
5524 | if (constructor_type && constructor_fields | |
5525 | && TREE_CODE (constructor_type) == ARRAY_TYPE | |
5526 | && TYPE_DOMAIN (constructor_type) | |
3f75a254 | 5527 | && !TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type))) |
3e4093b6 RS |
5528 | { |
5529 | /* Silently discard empty initializations. The parser will | |
5530 | already have pedwarned for empty brackets. */ | |
5531 | if (integer_zerop (constructor_unfilled_index)) | |
5532 | constructor_type = NULL_TREE; | |
366de0ce | 5533 | else |
3e4093b6 | 5534 | { |
366de0ce | 5535 | gcc_assert (!TYPE_SIZE (constructor_type)); |
c22cacf3 | 5536 | |
3e4093b6 RS |
5537 | if (constructor_depth > 2) |
5538 | error_init ("initialization of flexible array member in a nested context"); | |
5539 | else if (pedantic) | |
5540 | pedwarn_init ("initialization of a flexible array member"); | |
de520661 | 5541 | |
3e4093b6 RS |
5542 | /* We have already issued an error message for the existence |
5543 | of a flexible array member not at the end of the structure. | |
535a42b1 | 5544 | Discard the initializer so that we do not die later. */ |
3e4093b6 RS |
5545 | if (TREE_CHAIN (constructor_fields) != NULL_TREE) |
5546 | constructor_type = NULL_TREE; | |
5547 | } | |
3e4093b6 | 5548 | } |
de520661 | 5549 | |
3e4093b6 | 5550 | /* Warn when some struct elements are implicitly initialized to zero. */ |
eaac4679 | 5551 | if (warn_missing_field_initializers |
3e4093b6 RS |
5552 | && constructor_type |
5553 | && TREE_CODE (constructor_type) == RECORD_TYPE | |
5554 | && constructor_unfilled_fields) | |
5555 | { | |
5556 | /* Do not warn for flexible array members or zero-length arrays. */ | |
5557 | while (constructor_unfilled_fields | |
3f75a254 | 5558 | && (!DECL_SIZE (constructor_unfilled_fields) |
3e4093b6 RS |
5559 | || integer_zerop (DECL_SIZE (constructor_unfilled_fields)))) |
5560 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
cc77d4d5 | 5561 | |
3e4093b6 RS |
5562 | /* Do not warn if this level of the initializer uses member |
5563 | designators; it is likely to be deliberate. */ | |
5564 | if (constructor_unfilled_fields && !constructor_designated) | |
5565 | { | |
5566 | push_member_name (constructor_unfilled_fields); | |
683d6ff9 MLI |
5567 | warning_init (OPT_Wmissing_field_initializers, |
5568 | "missing initializer"); | |
3e4093b6 RS |
5569 | RESTORE_SPELLING_DEPTH (constructor_depth); |
5570 | } | |
5571 | } | |
de520661 | 5572 | |
3e4093b6 | 5573 | /* Pad out the end of the structure. */ |
916c5919 | 5574 | if (p->replacement_value.value) |
3e4093b6 RS |
5575 | /* If this closes a superfluous brace pair, |
5576 | just pass out the element between them. */ | |
916c5919 | 5577 | ret = p->replacement_value; |
3e4093b6 RS |
5578 | else if (constructor_type == 0) |
5579 | ; | |
5580 | else if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5581 | && TREE_CODE (constructor_type) != UNION_TYPE | |
5582 | && TREE_CODE (constructor_type) != ARRAY_TYPE | |
5583 | && TREE_CODE (constructor_type) != VECTOR_TYPE) | |
5584 | { | |
5585 | /* A nonincremental scalar initializer--just return | |
5586 | the element, after verifying there is just one. */ | |
4038c495 | 5587 | if (VEC_empty (constructor_elt,constructor_elements)) |
3e4093b6 RS |
5588 | { |
5589 | if (!constructor_erroneous) | |
5590 | error_init ("empty scalar initializer"); | |
916c5919 | 5591 | ret.value = error_mark_node; |
3e4093b6 | 5592 | } |
4038c495 | 5593 | else if (VEC_length (constructor_elt,constructor_elements) != 1) |
3e4093b6 RS |
5594 | { |
5595 | error_init ("extra elements in scalar initializer"); | |
4038c495 | 5596 | ret.value = VEC_index (constructor_elt,constructor_elements,0)->value; |
3e4093b6 RS |
5597 | } |
5598 | else | |
4038c495 | 5599 | ret.value = VEC_index (constructor_elt,constructor_elements,0)->value; |
3e4093b6 RS |
5600 | } |
5601 | else | |
5602 | { | |
5603 | if (constructor_erroneous) | |
916c5919 | 5604 | ret.value = error_mark_node; |
3e4093b6 RS |
5605 | else |
5606 | { | |
916c5919 | 5607 | ret.value = build_constructor (constructor_type, |
4038c495 | 5608 | constructor_elements); |
3e4093b6 | 5609 | if (constructor_constant) |
51eed280 | 5610 | TREE_CONSTANT (ret.value) = 1; |
3e4093b6 | 5611 | if (constructor_constant && constructor_simple) |
916c5919 | 5612 | TREE_STATIC (ret.value) = 1; |
3e4093b6 RS |
5613 | } |
5614 | } | |
de520661 | 5615 | |
3e4093b6 RS |
5616 | constructor_type = p->type; |
5617 | constructor_fields = p->fields; | |
5618 | constructor_index = p->index; | |
5619 | constructor_max_index = p->max_index; | |
5620 | constructor_unfilled_index = p->unfilled_index; | |
5621 | constructor_unfilled_fields = p->unfilled_fields; | |
5622 | constructor_bit_index = p->bit_index; | |
5623 | constructor_elements = p->elements; | |
5624 | constructor_constant = p->constant; | |
5625 | constructor_simple = p->simple; | |
5626 | constructor_erroneous = p->erroneous; | |
5627 | constructor_incremental = p->incremental; | |
5628 | constructor_designated = p->designated; | |
5629 | constructor_pending_elts = p->pending_elts; | |
5630 | constructor_depth = p->depth; | |
5631 | if (!p->implicit) | |
5632 | constructor_range_stack = p->range_stack; | |
5633 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
de520661 | 5634 | |
3e4093b6 RS |
5635 | constructor_stack = p->next; |
5636 | free (p); | |
b621a4dd | 5637 | |
5d5e98dc VR |
5638 | if (ret.value == 0 && constructor_stack == 0) |
5639 | ret.value = error_mark_node; | |
916c5919 | 5640 | return ret; |
3e4093b6 | 5641 | } |
8b6a5902 | 5642 | |
3e4093b6 RS |
5643 | /* Common handling for both array range and field name designators. |
5644 | ARRAY argument is nonzero for array ranges. Returns zero for success. */ | |
400fbf9f | 5645 | |
3e4093b6 RS |
5646 | static int |
5647 | set_designator (int array) | |
de520661 | 5648 | { |
3e4093b6 RS |
5649 | tree subtype; |
5650 | enum tree_code subcode; | |
de520661 | 5651 | |
3e4093b6 RS |
5652 | /* Don't die if an entire brace-pair level is superfluous |
5653 | in the containing level. */ | |
5654 | if (constructor_type == 0) | |
5655 | return 1; | |
de520661 | 5656 | |
366de0ce NS |
5657 | /* If there were errors in this designator list already, bail out |
5658 | silently. */ | |
b06df647 | 5659 | if (designator_erroneous) |
3e4093b6 | 5660 | return 1; |
e28cae4f | 5661 | |
3e4093b6 RS |
5662 | if (!designator_depth) |
5663 | { | |
366de0ce | 5664 | gcc_assert (!constructor_range_stack); |
de520661 | 5665 | |
3e4093b6 RS |
5666 | /* Designator list starts at the level of closest explicit |
5667 | braces. */ | |
5668 | while (constructor_stack->implicit) | |
5669 | process_init_element (pop_init_level (1)); | |
5670 | constructor_designated = 1; | |
5671 | return 0; | |
5672 | } | |
de520661 | 5673 | |
366de0ce | 5674 | switch (TREE_CODE (constructor_type)) |
3c3fa147 | 5675 | { |
366de0ce NS |
5676 | case RECORD_TYPE: |
5677 | case UNION_TYPE: | |
3e4093b6 RS |
5678 | subtype = TREE_TYPE (constructor_fields); |
5679 | if (subtype != error_mark_node) | |
5680 | subtype = TYPE_MAIN_VARIANT (subtype); | |
366de0ce NS |
5681 | break; |
5682 | case ARRAY_TYPE: | |
3e4093b6 | 5683 | subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); |
366de0ce NS |
5684 | break; |
5685 | default: | |
5686 | gcc_unreachable (); | |
de520661 | 5687 | } |
400fbf9f | 5688 | |
3e4093b6 RS |
5689 | subcode = TREE_CODE (subtype); |
5690 | if (array && subcode != ARRAY_TYPE) | |
5691 | { | |
5692 | error_init ("array index in non-array initializer"); | |
5693 | return 1; | |
5694 | } | |
5695 | else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE) | |
5696 | { | |
5697 | error_init ("field name not in record or union initializer"); | |
5698 | return 1; | |
5699 | } | |
d45cf215 | 5700 | |
3e4093b6 RS |
5701 | constructor_designated = 1; |
5702 | push_init_level (2); | |
5703 | return 0; | |
de520661 | 5704 | } |
400fbf9f | 5705 | |
3e4093b6 RS |
5706 | /* If there are range designators in designator list, push a new designator |
5707 | to constructor_range_stack. RANGE_END is end of such stack range or | |
5708 | NULL_TREE if there is no range designator at this level. */ | |
400fbf9f | 5709 | |
3e4093b6 RS |
5710 | static void |
5711 | push_range_stack (tree range_end) | |
5712 | { | |
5713 | struct constructor_range_stack *p; | |
400fbf9f | 5714 | |
5d038c4c | 5715 | p = GGC_NEW (struct constructor_range_stack); |
3e4093b6 RS |
5716 | p->prev = constructor_range_stack; |
5717 | p->next = 0; | |
5718 | p->fields = constructor_fields; | |
5719 | p->range_start = constructor_index; | |
5720 | p->index = constructor_index; | |
5721 | p->stack = constructor_stack; | |
5722 | p->range_end = range_end; | |
8b6a5902 | 5723 | if (constructor_range_stack) |
3e4093b6 RS |
5724 | constructor_range_stack->next = p; |
5725 | constructor_range_stack = p; | |
de520661 | 5726 | } |
400fbf9f | 5727 | |
3e4093b6 RS |
5728 | /* Within an array initializer, specify the next index to be initialized. |
5729 | FIRST is that index. If LAST is nonzero, then initialize a range | |
5730 | of indices, running from FIRST through LAST. */ | |
5a7ec9d9 | 5731 | |
de520661 | 5732 | void |
3e4093b6 | 5733 | set_init_index (tree first, tree last) |
de520661 | 5734 | { |
3e4093b6 RS |
5735 | if (set_designator (1)) |
5736 | return; | |
de520661 | 5737 | |
b06df647 | 5738 | designator_erroneous = 1; |
de520661 | 5739 | |
3ea8cd06 JM |
5740 | if (!INTEGRAL_TYPE_P (TREE_TYPE (first)) |
5741 | || (last && !INTEGRAL_TYPE_P (TREE_TYPE (last)))) | |
5742 | { | |
5743 | error_init ("array index in initializer not of integer type"); | |
5744 | return; | |
5745 | } | |
5746 | ||
3e4093b6 RS |
5747 | if (TREE_CODE (first) != INTEGER_CST) |
5748 | error_init ("nonconstant array index in initializer"); | |
5749 | else if (last != 0 && TREE_CODE (last) != INTEGER_CST) | |
5750 | error_init ("nonconstant array index in initializer"); | |
5751 | else if (TREE_CODE (constructor_type) != ARRAY_TYPE) | |
5752 | error_init ("array index in non-array initializer"); | |
622adc7e MK |
5753 | else if (tree_int_cst_sgn (first) == -1) |
5754 | error_init ("array index in initializer exceeds array bounds"); | |
3e4093b6 RS |
5755 | else if (constructor_max_index |
5756 | && tree_int_cst_lt (constructor_max_index, first)) | |
5757 | error_init ("array index in initializer exceeds array bounds"); | |
5758 | else | |
de520661 | 5759 | { |
3e4093b6 | 5760 | constructor_index = convert (bitsizetype, first); |
665f2503 | 5761 | |
3e4093b6 | 5762 | if (last) |
2bede729 | 5763 | { |
3e4093b6 RS |
5764 | if (tree_int_cst_equal (first, last)) |
5765 | last = 0; | |
5766 | else if (tree_int_cst_lt (last, first)) | |
5767 | { | |
5768 | error_init ("empty index range in initializer"); | |
5769 | last = 0; | |
5770 | } | |
5771 | else | |
5772 | { | |
5773 | last = convert (bitsizetype, last); | |
5774 | if (constructor_max_index != 0 | |
5775 | && tree_int_cst_lt (constructor_max_index, last)) | |
5776 | { | |
5777 | error_init ("array index range in initializer exceeds array bounds"); | |
5778 | last = 0; | |
5779 | } | |
5780 | } | |
2bede729 | 5781 | } |
fed3cef0 | 5782 | |
3e4093b6 | 5783 | designator_depth++; |
b06df647 | 5784 | designator_erroneous = 0; |
3e4093b6 RS |
5785 | if (constructor_range_stack || last) |
5786 | push_range_stack (last); | |
de520661 | 5787 | } |
de520661 | 5788 | } |
3e4093b6 RS |
5789 | |
5790 | /* Within a struct initializer, specify the next field to be initialized. */ | |
400fbf9f | 5791 | |
de520661 | 5792 | void |
3e4093b6 | 5793 | set_init_label (tree fieldname) |
de520661 | 5794 | { |
3e4093b6 | 5795 | tree tail; |
94ba5069 | 5796 | |
3e4093b6 RS |
5797 | if (set_designator (0)) |
5798 | return; | |
5799 | ||
b06df647 | 5800 | designator_erroneous = 1; |
3e4093b6 RS |
5801 | |
5802 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5803 | && TREE_CODE (constructor_type) != UNION_TYPE) | |
94ba5069 | 5804 | { |
3e4093b6 RS |
5805 | error_init ("field name not in record or union initializer"); |
5806 | return; | |
94ba5069 RS |
5807 | } |
5808 | ||
3e4093b6 RS |
5809 | for (tail = TYPE_FIELDS (constructor_type); tail; |
5810 | tail = TREE_CHAIN (tail)) | |
8b6a5902 | 5811 | { |
3e4093b6 RS |
5812 | if (DECL_NAME (tail) == fieldname) |
5813 | break; | |
8b6a5902 JJ |
5814 | } |
5815 | ||
3e4093b6 | 5816 | if (tail == 0) |
c51a1ba9 | 5817 | error ("unknown field %qE specified in initializer", fieldname); |
3e4093b6 | 5818 | else |
8b6a5902 | 5819 | { |
3e4093b6 RS |
5820 | constructor_fields = tail; |
5821 | designator_depth++; | |
b06df647 | 5822 | designator_erroneous = 0; |
3e4093b6 RS |
5823 | if (constructor_range_stack) |
5824 | push_range_stack (NULL_TREE); | |
8b6a5902 | 5825 | } |
3e4093b6 RS |
5826 | } |
5827 | \f | |
5828 | /* Add a new initializer to the tree of pending initializers. PURPOSE | |
5829 | identifies the initializer, either array index or field in a structure. | |
5830 | VALUE is the value of that index or field. */ | |
de520661 | 5831 | |
3e4093b6 RS |
5832 | static void |
5833 | add_pending_init (tree purpose, tree value) | |
5834 | { | |
5835 | struct init_node *p, **q, *r; | |
5836 | ||
5837 | q = &constructor_pending_elts; | |
5838 | p = 0; | |
5839 | ||
5840 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
de520661 | 5841 | { |
3e4093b6 | 5842 | while (*q != 0) |
91fa3c30 | 5843 | { |
3e4093b6 RS |
5844 | p = *q; |
5845 | if (tree_int_cst_lt (purpose, p->purpose)) | |
5846 | q = &p->left; | |
5847 | else if (tree_int_cst_lt (p->purpose, purpose)) | |
5848 | q = &p->right; | |
5849 | else | |
5850 | { | |
5851 | if (TREE_SIDE_EFFECTS (p->value)) | |
683d6ff9 | 5852 | warning_init (0, "initialized field with side-effects overwritten"); |
7ed322d7 | 5853 | else if (warn_override_init) |
683d6ff9 | 5854 | warning_init (OPT_Woverride_init, "initialized field overwritten"); |
3e4093b6 RS |
5855 | p->value = value; |
5856 | return; | |
5857 | } | |
91fa3c30 | 5858 | } |
de520661 | 5859 | } |
3e4093b6 | 5860 | else |
de520661 | 5861 | { |
3e4093b6 | 5862 | tree bitpos; |
400fbf9f | 5863 | |
3e4093b6 RS |
5864 | bitpos = bit_position (purpose); |
5865 | while (*q != NULL) | |
5866 | { | |
5867 | p = *q; | |
5868 | if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) | |
5869 | q = &p->left; | |
5870 | else if (p->purpose != purpose) | |
5871 | q = &p->right; | |
5872 | else | |
5873 | { | |
5874 | if (TREE_SIDE_EFFECTS (p->value)) | |
683d6ff9 | 5875 | warning_init (0, "initialized field with side-effects overwritten"); |
7ed322d7 | 5876 | else if (warn_override_init) |
683d6ff9 | 5877 | warning_init (OPT_Woverride_init, "initialized field overwritten"); |
3e4093b6 RS |
5878 | p->value = value; |
5879 | return; | |
5880 | } | |
5881 | } | |
91fa3c30 | 5882 | } |
b71c7f8a | 5883 | |
5d038c4c | 5884 | r = GGC_NEW (struct init_node); |
3e4093b6 RS |
5885 | r->purpose = purpose; |
5886 | r->value = value; | |
8b6a5902 | 5887 | |
3e4093b6 RS |
5888 | *q = r; |
5889 | r->parent = p; | |
5890 | r->left = 0; | |
5891 | r->right = 0; | |
5892 | r->balance = 0; | |
b71c7f8a | 5893 | |
3e4093b6 | 5894 | while (p) |
de520661 | 5895 | { |
3e4093b6 | 5896 | struct init_node *s; |
665f2503 | 5897 | |
3e4093b6 | 5898 | if (r == p->left) |
2bede729 | 5899 | { |
3e4093b6 RS |
5900 | if (p->balance == 0) |
5901 | p->balance = -1; | |
5902 | else if (p->balance < 0) | |
5903 | { | |
5904 | if (r->balance < 0) | |
5905 | { | |
5906 | /* L rotation. */ | |
5907 | p->left = r->right; | |
5908 | if (p->left) | |
5909 | p->left->parent = p; | |
5910 | r->right = p; | |
e7b6a0ee | 5911 | |
3e4093b6 RS |
5912 | p->balance = 0; |
5913 | r->balance = 0; | |
39bc99c2 | 5914 | |
3e4093b6 RS |
5915 | s = p->parent; |
5916 | p->parent = r; | |
5917 | r->parent = s; | |
5918 | if (s) | |
5919 | { | |
5920 | if (s->left == p) | |
5921 | s->left = r; | |
5922 | else | |
5923 | s->right = r; | |
5924 | } | |
5925 | else | |
5926 | constructor_pending_elts = r; | |
5927 | } | |
5928 | else | |
5929 | { | |
5930 | /* LR rotation. */ | |
5931 | struct init_node *t = r->right; | |
e7b6a0ee | 5932 | |
3e4093b6 RS |
5933 | r->right = t->left; |
5934 | if (r->right) | |
5935 | r->right->parent = r; | |
5936 | t->left = r; | |
5937 | ||
5938 | p->left = t->right; | |
5939 | if (p->left) | |
5940 | p->left->parent = p; | |
5941 | t->right = p; | |
5942 | ||
5943 | p->balance = t->balance < 0; | |
5944 | r->balance = -(t->balance > 0); | |
5945 | t->balance = 0; | |
5946 | ||
5947 | s = p->parent; | |
5948 | p->parent = t; | |
5949 | r->parent = t; | |
5950 | t->parent = s; | |
5951 | if (s) | |
5952 | { | |
5953 | if (s->left == p) | |
5954 | s->left = t; | |
5955 | else | |
5956 | s->right = t; | |
5957 | } | |
5958 | else | |
5959 | constructor_pending_elts = t; | |
5960 | } | |
5961 | break; | |
5962 | } | |
5963 | else | |
5964 | { | |
5965 | /* p->balance == +1; growth of left side balances the node. */ | |
5966 | p->balance = 0; | |
5967 | break; | |
5968 | } | |
2bede729 | 5969 | } |
3e4093b6 RS |
5970 | else /* r == p->right */ |
5971 | { | |
5972 | if (p->balance == 0) | |
5973 | /* Growth propagation from right side. */ | |
5974 | p->balance++; | |
5975 | else if (p->balance > 0) | |
5976 | { | |
5977 | if (r->balance > 0) | |
5978 | { | |
5979 | /* R rotation. */ | |
5980 | p->right = r->left; | |
5981 | if (p->right) | |
5982 | p->right->parent = p; | |
5983 | r->left = p; | |
5984 | ||
5985 | p->balance = 0; | |
5986 | r->balance = 0; | |
5987 | ||
5988 | s = p->parent; | |
5989 | p->parent = r; | |
5990 | r->parent = s; | |
5991 | if (s) | |
5992 | { | |
5993 | if (s->left == p) | |
5994 | s->left = r; | |
5995 | else | |
5996 | s->right = r; | |
5997 | } | |
5998 | else | |
5999 | constructor_pending_elts = r; | |
6000 | } | |
6001 | else /* r->balance == -1 */ | |
6002 | { | |
6003 | /* RL rotation */ | |
6004 | struct init_node *t = r->left; | |
6005 | ||
6006 | r->left = t->right; | |
6007 | if (r->left) | |
6008 | r->left->parent = r; | |
6009 | t->right = r; | |
6010 | ||
6011 | p->right = t->left; | |
6012 | if (p->right) | |
6013 | p->right->parent = p; | |
6014 | t->left = p; | |
6015 | ||
6016 | r->balance = (t->balance < 0); | |
6017 | p->balance = -(t->balance > 0); | |
6018 | t->balance = 0; | |
6019 | ||
6020 | s = p->parent; | |
6021 | p->parent = t; | |
6022 | r->parent = t; | |
6023 | t->parent = s; | |
6024 | if (s) | |
6025 | { | |
6026 | if (s->left == p) | |
6027 | s->left = t; | |
6028 | else | |
6029 | s->right = t; | |
6030 | } | |
6031 | else | |
6032 | constructor_pending_elts = t; | |
6033 | } | |
6034 | break; | |
6035 | } | |
6036 | else | |
6037 | { | |
6038 | /* p->balance == -1; growth of right side balances the node. */ | |
6039 | p->balance = 0; | |
6040 | break; | |
6041 | } | |
6042 | } | |
6043 | ||
6044 | r = p; | |
6045 | p = p->parent; | |
6046 | } | |
6047 | } | |
6048 | ||
6049 | /* Build AVL tree from a sorted chain. */ | |
6050 | ||
6051 | static void | |
6052 | set_nonincremental_init (void) | |
6053 | { | |
4038c495 GB |
6054 | unsigned HOST_WIDE_INT ix; |
6055 | tree index, value; | |
3e4093b6 RS |
6056 | |
6057 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
6058 | && TREE_CODE (constructor_type) != ARRAY_TYPE) | |
6059 | return; | |
6060 | ||
4038c495 GB |
6061 | FOR_EACH_CONSTRUCTOR_ELT (constructor_elements, ix, index, value) |
6062 | add_pending_init (index, value); | |
3e4093b6 RS |
6063 | constructor_elements = 0; |
6064 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
6065 | { | |
6066 | constructor_unfilled_fields = TYPE_FIELDS (constructor_type); | |
6067 | /* Skip any nameless bit fields at the beginning. */ | |
6068 | while (constructor_unfilled_fields != 0 | |
6069 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6070 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6071 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
fed3cef0 | 6072 | |
de520661 | 6073 | } |
3e4093b6 | 6074 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
de520661 | 6075 | { |
3e4093b6 RS |
6076 | if (TYPE_DOMAIN (constructor_type)) |
6077 | constructor_unfilled_index | |
6078 | = convert (bitsizetype, | |
6079 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
6080 | else | |
6081 | constructor_unfilled_index = bitsize_zero_node; | |
de520661 | 6082 | } |
3e4093b6 | 6083 | constructor_incremental = 0; |
de520661 | 6084 | } |
400fbf9f | 6085 | |
3e4093b6 | 6086 | /* Build AVL tree from a string constant. */ |
de520661 | 6087 | |
3e4093b6 RS |
6088 | static void |
6089 | set_nonincremental_init_from_string (tree str) | |
de520661 | 6090 | { |
3e4093b6 RS |
6091 | tree value, purpose, type; |
6092 | HOST_WIDE_INT val[2]; | |
6093 | const char *p, *end; | |
6094 | int byte, wchar_bytes, charwidth, bitpos; | |
de520661 | 6095 | |
366de0ce | 6096 | gcc_assert (TREE_CODE (constructor_type) == ARRAY_TYPE); |
940ff66d | 6097 | |
3e4093b6 RS |
6098 | if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) |
6099 | == TYPE_PRECISION (char_type_node)) | |
6100 | wchar_bytes = 1; | |
3e4093b6 | 6101 | else |
366de0ce NS |
6102 | { |
6103 | gcc_assert (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) | |
6104 | == TYPE_PRECISION (wchar_type_node)); | |
6105 | wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; | |
6106 | } | |
3e4093b6 RS |
6107 | charwidth = TYPE_PRECISION (char_type_node); |
6108 | type = TREE_TYPE (constructor_type); | |
6109 | p = TREE_STRING_POINTER (str); | |
6110 | end = p + TREE_STRING_LENGTH (str); | |
91fa3c30 | 6111 | |
3e4093b6 RS |
6112 | for (purpose = bitsize_zero_node; |
6113 | p < end && !tree_int_cst_lt (constructor_max_index, purpose); | |
6114 | purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node)) | |
584ef5fe | 6115 | { |
3e4093b6 | 6116 | if (wchar_bytes == 1) |
ffc5c6a9 | 6117 | { |
3e4093b6 RS |
6118 | val[1] = (unsigned char) *p++; |
6119 | val[0] = 0; | |
ffc5c6a9 RH |
6120 | } |
6121 | else | |
3e4093b6 RS |
6122 | { |
6123 | val[0] = 0; | |
6124 | val[1] = 0; | |
6125 | for (byte = 0; byte < wchar_bytes; byte++) | |
6126 | { | |
6127 | if (BYTES_BIG_ENDIAN) | |
6128 | bitpos = (wchar_bytes - byte - 1) * charwidth; | |
6129 | else | |
6130 | bitpos = byte * charwidth; | |
6131 | val[bitpos < HOST_BITS_PER_WIDE_INT] | |
6132 | |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++)) | |
6133 | << (bitpos % HOST_BITS_PER_WIDE_INT); | |
6134 | } | |
6135 | } | |
584ef5fe | 6136 | |
8df83eae | 6137 | if (!TYPE_UNSIGNED (type)) |
3e4093b6 RS |
6138 | { |
6139 | bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR; | |
6140 | if (bitpos < HOST_BITS_PER_WIDE_INT) | |
6141 | { | |
6142 | if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1))) | |
6143 | { | |
6144 | val[1] |= ((HOST_WIDE_INT) -1) << bitpos; | |
6145 | val[0] = -1; | |
6146 | } | |
6147 | } | |
6148 | else if (bitpos == HOST_BITS_PER_WIDE_INT) | |
6149 | { | |
6150 | if (val[1] < 0) | |
c22cacf3 | 6151 | val[0] = -1; |
3e4093b6 RS |
6152 | } |
6153 | else if (val[0] & (((HOST_WIDE_INT) 1) | |
6154 | << (bitpos - 1 - HOST_BITS_PER_WIDE_INT))) | |
6155 | val[0] |= ((HOST_WIDE_INT) -1) | |
6156 | << (bitpos - HOST_BITS_PER_WIDE_INT); | |
6157 | } | |
ffc5c6a9 | 6158 | |
7d60be94 | 6159 | value = build_int_cst_wide (type, val[1], val[0]); |
3e4093b6 | 6160 | add_pending_init (purpose, value); |
9dfcc8db BH |
6161 | } |
6162 | ||
3e4093b6 RS |
6163 | constructor_incremental = 0; |
6164 | } | |
de520661 | 6165 | |
3e4093b6 RS |
6166 | /* Return value of FIELD in pending initializer or zero if the field was |
6167 | not initialized yet. */ | |
6168 | ||
6169 | static tree | |
6170 | find_init_member (tree field) | |
6171 | { | |
6172 | struct init_node *p; | |
6173 | ||
6174 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
19d76e60 | 6175 | { |
3e4093b6 RS |
6176 | if (constructor_incremental |
6177 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
6178 | set_nonincremental_init (); | |
6179 | ||
6180 | p = constructor_pending_elts; | |
6181 | while (p) | |
19d76e60 | 6182 | { |
3e4093b6 RS |
6183 | if (tree_int_cst_lt (field, p->purpose)) |
6184 | p = p->left; | |
6185 | else if (tree_int_cst_lt (p->purpose, field)) | |
6186 | p = p->right; | |
6187 | else | |
6188 | return p->value; | |
19d76e60 | 6189 | } |
19d76e60 | 6190 | } |
3e4093b6 | 6191 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) |
de520661 | 6192 | { |
3e4093b6 | 6193 | tree bitpos = bit_position (field); |
de520661 | 6194 | |
3e4093b6 RS |
6195 | if (constructor_incremental |
6196 | && (!constructor_unfilled_fields | |
6197 | || tree_int_cst_lt (bitpos, | |
6198 | bit_position (constructor_unfilled_fields)))) | |
6199 | set_nonincremental_init (); | |
de520661 | 6200 | |
3e4093b6 RS |
6201 | p = constructor_pending_elts; |
6202 | while (p) | |
6203 | { | |
6204 | if (field == p->purpose) | |
6205 | return p->value; | |
6206 | else if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) | |
6207 | p = p->left; | |
6208 | else | |
6209 | p = p->right; | |
6210 | } | |
6211 | } | |
6212 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
de520661 | 6213 | { |
4038c495 GB |
6214 | if (!VEC_empty (constructor_elt, constructor_elements) |
6215 | && (VEC_last (constructor_elt, constructor_elements)->index | |
6216 | == field)) | |
6217 | return VEC_last (constructor_elt, constructor_elements)->value; | |
de520661 | 6218 | } |
3e4093b6 | 6219 | return 0; |
de520661 RS |
6220 | } |
6221 | ||
3e4093b6 RS |
6222 | /* "Output" the next constructor element. |
6223 | At top level, really output it to assembler code now. | |
6224 | Otherwise, collect it in a list from which we will make a CONSTRUCTOR. | |
6225 | TYPE is the data type that the containing data type wants here. | |
6226 | FIELD is the field (a FIELD_DECL) or the index that this element fills. | |
916c5919 JM |
6227 | If VALUE is a string constant, STRICT_STRING is true if it is |
6228 | unparenthesized or we should not warn here for it being parenthesized. | |
6229 | For other types of VALUE, STRICT_STRING is not used. | |
8b6a5902 | 6230 | |
3e4093b6 RS |
6231 | PENDING if non-nil means output pending elements that belong |
6232 | right after this element. (PENDING is normally 1; | |
6233 | it is 0 while outputting pending elements, to avoid recursion.) */ | |
8b6a5902 | 6234 | |
3e4093b6 | 6235 | static void |
916c5919 JM |
6236 | output_init_element (tree value, bool strict_string, tree type, tree field, |
6237 | int pending) | |
3e4093b6 | 6238 | { |
4038c495 GB |
6239 | constructor_elt *celt; |
6240 | ||
0a880880 | 6241 | if (type == error_mark_node || value == error_mark_node) |
8b6a5902 | 6242 | { |
3e4093b6 RS |
6243 | constructor_erroneous = 1; |
6244 | return; | |
8b6a5902 | 6245 | } |
46bdb9cf JM |
6246 | if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE |
6247 | && (TREE_CODE (value) == STRING_CST | |
6248 | || TREE_CODE (value) == COMPOUND_LITERAL_EXPR) | |
6249 | && !(TREE_CODE (value) == STRING_CST | |
6250 | && TREE_CODE (type) == ARRAY_TYPE | |
6251 | && INTEGRAL_TYPE_P (TREE_TYPE (type))) | |
6252 | && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)), | |
6253 | TYPE_MAIN_VARIANT (type))) | |
f2a71bbc | 6254 | value = array_to_pointer_conversion (value); |
8b6a5902 | 6255 | |
3e4093b6 RS |
6256 | if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR |
6257 | && require_constant_value && !flag_isoc99 && pending) | |
8b6a5902 | 6258 | { |
3e4093b6 RS |
6259 | /* As an extension, allow initializing objects with static storage |
6260 | duration with compound literals (which are then treated just as | |
6261 | the brace enclosed list they contain). */ | |
6262 | tree decl = COMPOUND_LITERAL_EXPR_DECL (value); | |
6263 | value = DECL_INITIAL (decl); | |
8b6a5902 JJ |
6264 | } |
6265 | ||
3e4093b6 RS |
6266 | if (value == error_mark_node) |
6267 | constructor_erroneous = 1; | |
6268 | else if (!TREE_CONSTANT (value)) | |
6269 | constructor_constant = 0; | |
116df786 | 6270 | else if (!initializer_constant_valid_p (value, TREE_TYPE (value)) |
3e4093b6 RS |
6271 | || ((TREE_CODE (constructor_type) == RECORD_TYPE |
6272 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6273 | && DECL_C_BIT_FIELD (field) | |
6274 | && TREE_CODE (value) != INTEGER_CST)) | |
6275 | constructor_simple = 0; | |
6276 | ||
116df786 | 6277 | if (!initializer_constant_valid_p (value, TREE_TYPE (value))) |
8b6a5902 | 6278 | { |
116df786 RH |
6279 | if (require_constant_value) |
6280 | { | |
6281 | error_init ("initializer element is not constant"); | |
6282 | value = error_mark_node; | |
6283 | } | |
6284 | else if (require_constant_elements) | |
6285 | pedwarn ("initializer element is not computable at load time"); | |
8b6a5902 | 6286 | } |
3e4093b6 RS |
6287 | |
6288 | /* If this field is empty (and not at the end of structure), | |
6289 | don't do anything other than checking the initializer. */ | |
6290 | if (field | |
6291 | && (TREE_TYPE (field) == error_mark_node | |
6292 | || (COMPLETE_TYPE_P (TREE_TYPE (field)) | |
6293 | && integer_zerop (TYPE_SIZE (TREE_TYPE (field))) | |
6294 | && (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6295 | || TREE_CHAIN (field))))) | |
6296 | return; | |
6297 | ||
916c5919 | 6298 | value = digest_init (type, value, strict_string, require_constant_value); |
3e4093b6 | 6299 | if (value == error_mark_node) |
8b6a5902 | 6300 | { |
3e4093b6 RS |
6301 | constructor_erroneous = 1; |
6302 | return; | |
8b6a5902 | 6303 | } |
8b6a5902 | 6304 | |
3e4093b6 RS |
6305 | /* If this element doesn't come next in sequence, |
6306 | put it on constructor_pending_elts. */ | |
6307 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6308 | && (!constructor_incremental | |
6309 | || !tree_int_cst_equal (field, constructor_unfilled_index))) | |
8b6a5902 | 6310 | { |
3e4093b6 RS |
6311 | if (constructor_incremental |
6312 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
6313 | set_nonincremental_init (); | |
6314 | ||
6315 | add_pending_init (field, value); | |
6316 | return; | |
8b6a5902 | 6317 | } |
3e4093b6 RS |
6318 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
6319 | && (!constructor_incremental | |
6320 | || field != constructor_unfilled_fields)) | |
8b6a5902 | 6321 | { |
3e4093b6 RS |
6322 | /* We do this for records but not for unions. In a union, |
6323 | no matter which field is specified, it can be initialized | |
6324 | right away since it starts at the beginning of the union. */ | |
6325 | if (constructor_incremental) | |
6326 | { | |
6327 | if (!constructor_unfilled_fields) | |
6328 | set_nonincremental_init (); | |
6329 | else | |
6330 | { | |
6331 | tree bitpos, unfillpos; | |
6332 | ||
6333 | bitpos = bit_position (field); | |
6334 | unfillpos = bit_position (constructor_unfilled_fields); | |
6335 | ||
6336 | if (tree_int_cst_lt (bitpos, unfillpos)) | |
6337 | set_nonincremental_init (); | |
6338 | } | |
6339 | } | |
6340 | ||
6341 | add_pending_init (field, value); | |
6342 | return; | |
8b6a5902 | 6343 | } |
3e4093b6 | 6344 | else if (TREE_CODE (constructor_type) == UNION_TYPE |
4038c495 | 6345 | && !VEC_empty (constructor_elt, constructor_elements)) |
3e4093b6 | 6346 | { |
4038c495 GB |
6347 | if (TREE_SIDE_EFFECTS (VEC_last (constructor_elt, |
6348 | constructor_elements)->value)) | |
683d6ff9 | 6349 | warning_init (0, "initialized field with side-effects overwritten"); |
7ed322d7 | 6350 | else if (warn_override_init) |
683d6ff9 | 6351 | warning_init (OPT_Woverride_init, "initialized field overwritten"); |
8b6a5902 | 6352 | |
3e4093b6 RS |
6353 | /* We can have just one union field set. */ |
6354 | constructor_elements = 0; | |
6355 | } | |
8b6a5902 | 6356 | |
3e4093b6 RS |
6357 | /* Otherwise, output this element either to |
6358 | constructor_elements or to the assembler file. */ | |
8b6a5902 | 6359 | |
4038c495 GB |
6360 | celt = VEC_safe_push (constructor_elt, gc, constructor_elements, NULL); |
6361 | celt->index = field; | |
6362 | celt->value = value; | |
8b6a5902 | 6363 | |
3e4093b6 RS |
6364 | /* Advance the variable that indicates sequential elements output. */ |
6365 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6366 | constructor_unfilled_index | |
6367 | = size_binop (PLUS_EXPR, constructor_unfilled_index, | |
6368 | bitsize_one_node); | |
6369 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
6370 | { | |
6371 | constructor_unfilled_fields | |
6372 | = TREE_CHAIN (constructor_unfilled_fields); | |
8b6a5902 | 6373 | |
3e4093b6 RS |
6374 | /* Skip any nameless bit fields. */ |
6375 | while (constructor_unfilled_fields != 0 | |
6376 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6377 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6378 | constructor_unfilled_fields = | |
6379 | TREE_CHAIN (constructor_unfilled_fields); | |
6380 | } | |
6381 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
6382 | constructor_unfilled_fields = 0; | |
de520661 | 6383 | |
3e4093b6 RS |
6384 | /* Now output any pending elements which have become next. */ |
6385 | if (pending) | |
6386 | output_pending_init_elements (0); | |
6387 | } | |
8b6a5902 | 6388 | |
3e4093b6 RS |
6389 | /* Output any pending elements which have become next. |
6390 | As we output elements, constructor_unfilled_{fields,index} | |
6391 | advances, which may cause other elements to become next; | |
6392 | if so, they too are output. | |
8b6a5902 | 6393 | |
3e4093b6 RS |
6394 | If ALL is 0, we return when there are |
6395 | no more pending elements to output now. | |
665f2503 | 6396 | |
3e4093b6 RS |
6397 | If ALL is 1, we output space as necessary so that |
6398 | we can output all the pending elements. */ | |
19d76e60 | 6399 | |
3e4093b6 RS |
6400 | static void |
6401 | output_pending_init_elements (int all) | |
6402 | { | |
6403 | struct init_node *elt = constructor_pending_elts; | |
6404 | tree next; | |
de520661 | 6405 | |
3e4093b6 RS |
6406 | retry: |
6407 | ||
ba228239 | 6408 | /* Look through the whole pending tree. |
3e4093b6 RS |
6409 | If we find an element that should be output now, |
6410 | output it. Otherwise, set NEXT to the element | |
6411 | that comes first among those still pending. */ | |
6412 | ||
6413 | next = 0; | |
6414 | while (elt) | |
6415 | { | |
6416 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
8b6a5902 | 6417 | { |
3e4093b6 RS |
6418 | if (tree_int_cst_equal (elt->purpose, |
6419 | constructor_unfilled_index)) | |
916c5919 | 6420 | output_init_element (elt->value, true, |
3e4093b6 RS |
6421 | TREE_TYPE (constructor_type), |
6422 | constructor_unfilled_index, 0); | |
6423 | else if (tree_int_cst_lt (constructor_unfilled_index, | |
6424 | elt->purpose)) | |
8b6a5902 | 6425 | { |
3e4093b6 RS |
6426 | /* Advance to the next smaller node. */ |
6427 | if (elt->left) | |
6428 | elt = elt->left; | |
6429 | else | |
6430 | { | |
6431 | /* We have reached the smallest node bigger than the | |
6432 | current unfilled index. Fill the space first. */ | |
6433 | next = elt->purpose; | |
6434 | break; | |
6435 | } | |
8b6a5902 | 6436 | } |
ce662d4c JJ |
6437 | else |
6438 | { | |
3e4093b6 RS |
6439 | /* Advance to the next bigger node. */ |
6440 | if (elt->right) | |
6441 | elt = elt->right; | |
6442 | else | |
ce662d4c | 6443 | { |
3e4093b6 RS |
6444 | /* We have reached the biggest node in a subtree. Find |
6445 | the parent of it, which is the next bigger node. */ | |
6446 | while (elt->parent && elt->parent->right == elt) | |
6447 | elt = elt->parent; | |
6448 | elt = elt->parent; | |
6449 | if (elt && tree_int_cst_lt (constructor_unfilled_index, | |
6450 | elt->purpose)) | |
6451 | { | |
6452 | next = elt->purpose; | |
6453 | break; | |
6454 | } | |
ce662d4c JJ |
6455 | } |
6456 | } | |
8b6a5902 | 6457 | } |
3e4093b6 RS |
6458 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
6459 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6460 | { | |
6461 | tree ctor_unfilled_bitpos, elt_bitpos; | |
ce662d4c | 6462 | |
3e4093b6 RS |
6463 | /* If the current record is complete we are done. */ |
6464 | if (constructor_unfilled_fields == 0) | |
6465 | break; | |
de520661 | 6466 | |
3e4093b6 RS |
6467 | ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields); |
6468 | elt_bitpos = bit_position (elt->purpose); | |
6469 | /* We can't compare fields here because there might be empty | |
6470 | fields in between. */ | |
6471 | if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos)) | |
6472 | { | |
6473 | constructor_unfilled_fields = elt->purpose; | |
916c5919 | 6474 | output_init_element (elt->value, true, TREE_TYPE (elt->purpose), |
3e4093b6 RS |
6475 | elt->purpose, 0); |
6476 | } | |
6477 | else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos)) | |
6478 | { | |
6479 | /* Advance to the next smaller node. */ | |
6480 | if (elt->left) | |
6481 | elt = elt->left; | |
6482 | else | |
6483 | { | |
6484 | /* We have reached the smallest node bigger than the | |
6485 | current unfilled field. Fill the space first. */ | |
6486 | next = elt->purpose; | |
6487 | break; | |
6488 | } | |
6489 | } | |
6490 | else | |
6491 | { | |
6492 | /* Advance to the next bigger node. */ | |
6493 | if (elt->right) | |
6494 | elt = elt->right; | |
6495 | else | |
6496 | { | |
6497 | /* We have reached the biggest node in a subtree. Find | |
6498 | the parent of it, which is the next bigger node. */ | |
6499 | while (elt->parent && elt->parent->right == elt) | |
6500 | elt = elt->parent; | |
6501 | elt = elt->parent; | |
6502 | if (elt | |
6503 | && (tree_int_cst_lt (ctor_unfilled_bitpos, | |
6504 | bit_position (elt->purpose)))) | |
6505 | { | |
6506 | next = elt->purpose; | |
6507 | break; | |
6508 | } | |
6509 | } | |
6510 | } | |
6511 | } | |
6512 | } | |
de520661 | 6513 | |
3e4093b6 RS |
6514 | /* Ordinarily return, but not if we want to output all |
6515 | and there are elements left. */ | |
3f75a254 | 6516 | if (!(all && next != 0)) |
e5cfb88f RK |
6517 | return; |
6518 | ||
3e4093b6 RS |
6519 | /* If it's not incremental, just skip over the gap, so that after |
6520 | jumping to retry we will output the next successive element. */ | |
6521 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6522 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6523 | constructor_unfilled_fields = next; | |
6524 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6525 | constructor_unfilled_index = next; | |
de520661 | 6526 | |
3e4093b6 RS |
6527 | /* ELT now points to the node in the pending tree with the next |
6528 | initializer to output. */ | |
6529 | goto retry; | |
de520661 RS |
6530 | } |
6531 | \f | |
3e4093b6 RS |
6532 | /* Add one non-braced element to the current constructor level. |
6533 | This adjusts the current position within the constructor's type. | |
6534 | This may also start or terminate implicit levels | |
6535 | to handle a partly-braced initializer. | |
e5e809f4 | 6536 | |
3e4093b6 RS |
6537 | Once this has found the correct level for the new element, |
6538 | it calls output_init_element. */ | |
6539 | ||
6540 | void | |
916c5919 | 6541 | process_init_element (struct c_expr value) |
e5e809f4 | 6542 | { |
916c5919 JM |
6543 | tree orig_value = value.value; |
6544 | int string_flag = orig_value != 0 && TREE_CODE (orig_value) == STRING_CST; | |
6545 | bool strict_string = value.original_code == STRING_CST; | |
e5e809f4 | 6546 | |
3e4093b6 | 6547 | designator_depth = 0; |
b06df647 | 6548 | designator_erroneous = 0; |
e5e809f4 | 6549 | |
3e4093b6 RS |
6550 | /* Handle superfluous braces around string cst as in |
6551 | char x[] = {"foo"}; */ | |
6552 | if (string_flag | |
6553 | && constructor_type | |
6554 | && TREE_CODE (constructor_type) == ARRAY_TYPE | |
197463ae | 6555 | && INTEGRAL_TYPE_P (TREE_TYPE (constructor_type)) |
3e4093b6 | 6556 | && integer_zerop (constructor_unfilled_index)) |
e5e809f4 | 6557 | { |
916c5919 | 6558 | if (constructor_stack->replacement_value.value) |
c22cacf3 | 6559 | error_init ("excess elements in char array initializer"); |
3e4093b6 RS |
6560 | constructor_stack->replacement_value = value; |
6561 | return; | |
e5e809f4 | 6562 | } |
8b6a5902 | 6563 | |
916c5919 | 6564 | if (constructor_stack->replacement_value.value != 0) |
3e4093b6 RS |
6565 | { |
6566 | error_init ("excess elements in struct initializer"); | |
6567 | return; | |
e5e809f4 JL |
6568 | } |
6569 | ||
3e4093b6 RS |
6570 | /* Ignore elements of a brace group if it is entirely superfluous |
6571 | and has already been diagnosed. */ | |
6572 | if (constructor_type == 0) | |
6573 | return; | |
e5e809f4 | 6574 | |
3e4093b6 RS |
6575 | /* If we've exhausted any levels that didn't have braces, |
6576 | pop them now. */ | |
6577 | while (constructor_stack->implicit) | |
6578 | { | |
6579 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6580 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6581 | && constructor_fields == 0) | |
6582 | process_init_element (pop_init_level (1)); | |
6583 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6584 | && (constructor_max_index == 0 | |
6585 | || tree_int_cst_lt (constructor_max_index, | |
6586 | constructor_index))) | |
6587 | process_init_element (pop_init_level (1)); | |
6588 | else | |
6589 | break; | |
6590 | } | |
e5e809f4 | 6591 | |
3e4093b6 RS |
6592 | /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */ |
6593 | if (constructor_range_stack) | |
e5e809f4 | 6594 | { |
3e4093b6 RS |
6595 | /* If value is a compound literal and we'll be just using its |
6596 | content, don't put it into a SAVE_EXPR. */ | |
916c5919 | 6597 | if (TREE_CODE (value.value) != COMPOUND_LITERAL_EXPR |
3e4093b6 RS |
6598 | || !require_constant_value |
6599 | || flag_isoc99) | |
916c5919 | 6600 | value.value = save_expr (value.value); |
3e4093b6 | 6601 | } |
e5e809f4 | 6602 | |
3e4093b6 RS |
6603 | while (1) |
6604 | { | |
6605 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
e5e809f4 | 6606 | { |
3e4093b6 RS |
6607 | tree fieldtype; |
6608 | enum tree_code fieldcode; | |
e5e809f4 | 6609 | |
3e4093b6 RS |
6610 | if (constructor_fields == 0) |
6611 | { | |
6612 | pedwarn_init ("excess elements in struct initializer"); | |
6613 | break; | |
6614 | } | |
e5e809f4 | 6615 | |
3e4093b6 RS |
6616 | fieldtype = TREE_TYPE (constructor_fields); |
6617 | if (fieldtype != error_mark_node) | |
6618 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
6619 | fieldcode = TREE_CODE (fieldtype); | |
e5e809f4 | 6620 | |
3e4093b6 RS |
6621 | /* Error for non-static initialization of a flexible array member. */ |
6622 | if (fieldcode == ARRAY_TYPE | |
6623 | && !require_constant_value | |
6624 | && TYPE_SIZE (fieldtype) == NULL_TREE | |
6625 | && TREE_CHAIN (constructor_fields) == NULL_TREE) | |
6626 | { | |
6627 | error_init ("non-static initialization of a flexible array member"); | |
6628 | break; | |
6629 | } | |
e5e809f4 | 6630 | |
3e4093b6 | 6631 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6632 | if (value.value != 0 |
3e4093b6 | 6633 | && fieldcode == ARRAY_TYPE |
197463ae | 6634 | && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype)) |
3e4093b6 | 6635 | && string_flag) |
916c5919 | 6636 | value.value = orig_value; |
3e4093b6 RS |
6637 | /* Otherwise, if we have come to a subaggregate, |
6638 | and we don't have an element of its type, push into it. */ | |
0953878d | 6639 | else if (value.value != 0 |
916c5919 JM |
6640 | && value.value != error_mark_node |
6641 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype | |
3e4093b6 RS |
6642 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE |
6643 | || fieldcode == UNION_TYPE)) | |
6644 | { | |
6645 | push_init_level (1); | |
6646 | continue; | |
6647 | } | |
e5e809f4 | 6648 | |
916c5919 | 6649 | if (value.value) |
3e4093b6 RS |
6650 | { |
6651 | push_member_name (constructor_fields); | |
916c5919 JM |
6652 | output_init_element (value.value, strict_string, |
6653 | fieldtype, constructor_fields, 1); | |
3e4093b6 | 6654 | RESTORE_SPELLING_DEPTH (constructor_depth); |
e5e809f4 JL |
6655 | } |
6656 | else | |
3e4093b6 RS |
6657 | /* Do the bookkeeping for an element that was |
6658 | directly output as a constructor. */ | |
e5e809f4 | 6659 | { |
3e4093b6 RS |
6660 | /* For a record, keep track of end position of last field. */ |
6661 | if (DECL_SIZE (constructor_fields)) | |
c22cacf3 | 6662 | constructor_bit_index |
3e4093b6 | 6663 | = size_binop (PLUS_EXPR, |
c22cacf3 MS |
6664 | bit_position (constructor_fields), |
6665 | DECL_SIZE (constructor_fields)); | |
3e4093b6 RS |
6666 | |
6667 | /* If the current field was the first one not yet written out, | |
6668 | it isn't now, so update. */ | |
6669 | if (constructor_unfilled_fields == constructor_fields) | |
6670 | { | |
6671 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
6672 | /* Skip any nameless bit fields. */ | |
6673 | while (constructor_unfilled_fields != 0 | |
6674 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6675 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6676 | constructor_unfilled_fields = | |
6677 | TREE_CHAIN (constructor_unfilled_fields); | |
6678 | } | |
e5e809f4 | 6679 | } |
3e4093b6 RS |
6680 | |
6681 | constructor_fields = TREE_CHAIN (constructor_fields); | |
6682 | /* Skip any nameless bit fields at the beginning. */ | |
6683 | while (constructor_fields != 0 | |
6684 | && DECL_C_BIT_FIELD (constructor_fields) | |
6685 | && DECL_NAME (constructor_fields) == 0) | |
6686 | constructor_fields = TREE_CHAIN (constructor_fields); | |
e5e809f4 | 6687 | } |
3e4093b6 | 6688 | else if (TREE_CODE (constructor_type) == UNION_TYPE) |
e5e809f4 | 6689 | { |
3e4093b6 RS |
6690 | tree fieldtype; |
6691 | enum tree_code fieldcode; | |
e5e809f4 | 6692 | |
3e4093b6 RS |
6693 | if (constructor_fields == 0) |
6694 | { | |
6695 | pedwarn_init ("excess elements in union initializer"); | |
6696 | break; | |
6697 | } | |
e5e809f4 | 6698 | |
3e4093b6 RS |
6699 | fieldtype = TREE_TYPE (constructor_fields); |
6700 | if (fieldtype != error_mark_node) | |
6701 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
6702 | fieldcode = TREE_CODE (fieldtype); | |
e5e809f4 | 6703 | |
3e4093b6 RS |
6704 | /* Warn that traditional C rejects initialization of unions. |
6705 | We skip the warning if the value is zero. This is done | |
6706 | under the assumption that the zero initializer in user | |
6707 | code appears conditioned on e.g. __STDC__ to avoid | |
6708 | "missing initializer" warnings and relies on default | |
6709 | initialization to zero in the traditional C case. | |
6710 | We also skip the warning if the initializer is designated, | |
6711 | again on the assumption that this must be conditional on | |
6712 | __STDC__ anyway (and we've already complained about the | |
6713 | member-designator already). */ | |
3176a0c2 | 6714 | if (!in_system_header && !constructor_designated |
916c5919 JM |
6715 | && !(value.value && (integer_zerop (value.value) |
6716 | || real_zerop (value.value)))) | |
3176a0c2 DD |
6717 | warning (OPT_Wtraditional, "traditional C rejects initialization " |
6718 | "of unions"); | |
e5e809f4 | 6719 | |
3e4093b6 | 6720 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6721 | if (value.value != 0 |
3e4093b6 | 6722 | && fieldcode == ARRAY_TYPE |
197463ae | 6723 | && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype)) |
3e4093b6 | 6724 | && string_flag) |
916c5919 | 6725 | value.value = orig_value; |
3e4093b6 RS |
6726 | /* Otherwise, if we have come to a subaggregate, |
6727 | and we don't have an element of its type, push into it. */ | |
0953878d | 6728 | else if (value.value != 0 |
916c5919 JM |
6729 | && value.value != error_mark_node |
6730 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype | |
3e4093b6 RS |
6731 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE |
6732 | || fieldcode == UNION_TYPE)) | |
6733 | { | |
6734 | push_init_level (1); | |
6735 | continue; | |
6736 | } | |
e5e809f4 | 6737 | |
916c5919 | 6738 | if (value.value) |
3e4093b6 RS |
6739 | { |
6740 | push_member_name (constructor_fields); | |
916c5919 JM |
6741 | output_init_element (value.value, strict_string, |
6742 | fieldtype, constructor_fields, 1); | |
3e4093b6 | 6743 | RESTORE_SPELLING_DEPTH (constructor_depth); |
e5e809f4 JL |
6744 | } |
6745 | else | |
3e4093b6 RS |
6746 | /* Do the bookkeeping for an element that was |
6747 | directly output as a constructor. */ | |
e5e809f4 | 6748 | { |
3e4093b6 RS |
6749 | constructor_bit_index = DECL_SIZE (constructor_fields); |
6750 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
e5e809f4 | 6751 | } |
e5e809f4 | 6752 | |
3e4093b6 RS |
6753 | constructor_fields = 0; |
6754 | } | |
6755 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6756 | { | |
6757 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6758 | enum tree_code eltcode = TREE_CODE (elttype); | |
e5e809f4 | 6759 | |
3e4093b6 | 6760 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6761 | if (value.value != 0 |
3e4093b6 | 6762 | && eltcode == ARRAY_TYPE |
197463ae | 6763 | && INTEGRAL_TYPE_P (TREE_TYPE (elttype)) |
3e4093b6 | 6764 | && string_flag) |
916c5919 | 6765 | value.value = orig_value; |
3e4093b6 RS |
6766 | /* Otherwise, if we have come to a subaggregate, |
6767 | and we don't have an element of its type, push into it. */ | |
0953878d | 6768 | else if (value.value != 0 |
916c5919 JM |
6769 | && value.value != error_mark_node |
6770 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != elttype | |
3e4093b6 RS |
6771 | && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE |
6772 | || eltcode == UNION_TYPE)) | |
6773 | { | |
6774 | push_init_level (1); | |
6775 | continue; | |
6776 | } | |
8b6a5902 | 6777 | |
3e4093b6 RS |
6778 | if (constructor_max_index != 0 |
6779 | && (tree_int_cst_lt (constructor_max_index, constructor_index) | |
6780 | || integer_all_onesp (constructor_max_index))) | |
6781 | { | |
6782 | pedwarn_init ("excess elements in array initializer"); | |
6783 | break; | |
6784 | } | |
8b6a5902 | 6785 | |
3e4093b6 | 6786 | /* Now output the actual element. */ |
916c5919 | 6787 | if (value.value) |
3e4093b6 | 6788 | { |
a0f0ab9f | 6789 | push_array_bounds (tree_low_cst (constructor_index, 1)); |
916c5919 JM |
6790 | output_init_element (value.value, strict_string, |
6791 | elttype, constructor_index, 1); | |
3e4093b6 RS |
6792 | RESTORE_SPELLING_DEPTH (constructor_depth); |
6793 | } | |
2f6e4e97 | 6794 | |
3e4093b6 RS |
6795 | constructor_index |
6796 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
8b6a5902 | 6797 | |
916c5919 | 6798 | if (!value.value) |
3e4093b6 RS |
6799 | /* If we are doing the bookkeeping for an element that was |
6800 | directly output as a constructor, we must update | |
6801 | constructor_unfilled_index. */ | |
6802 | constructor_unfilled_index = constructor_index; | |
6803 | } | |
6804 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
6805 | { | |
6806 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
8b6a5902 | 6807 | |
c22cacf3 MS |
6808 | /* Do a basic check of initializer size. Note that vectors |
6809 | always have a fixed size derived from their type. */ | |
3e4093b6 RS |
6810 | if (tree_int_cst_lt (constructor_max_index, constructor_index)) |
6811 | { | |
6812 | pedwarn_init ("excess elements in vector initializer"); | |
6813 | break; | |
6814 | } | |
8b6a5902 | 6815 | |
3e4093b6 | 6816 | /* Now output the actual element. */ |
916c5919 JM |
6817 | if (value.value) |
6818 | output_init_element (value.value, strict_string, | |
6819 | elttype, constructor_index, 1); | |
8b6a5902 | 6820 | |
3e4093b6 RS |
6821 | constructor_index |
6822 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
8b6a5902 | 6823 | |
916c5919 | 6824 | if (!value.value) |
3e4093b6 RS |
6825 | /* If we are doing the bookkeeping for an element that was |
6826 | directly output as a constructor, we must update | |
6827 | constructor_unfilled_index. */ | |
6828 | constructor_unfilled_index = constructor_index; | |
6829 | } | |
8b6a5902 | 6830 | |
3e4093b6 RS |
6831 | /* Handle the sole element allowed in a braced initializer |
6832 | for a scalar variable. */ | |
b4519d39 SB |
6833 | else if (constructor_type != error_mark_node |
6834 | && constructor_fields == 0) | |
8b6a5902 | 6835 | { |
3e4093b6 RS |
6836 | pedwarn_init ("excess elements in scalar initializer"); |
6837 | break; | |
8b6a5902 JJ |
6838 | } |
6839 | else | |
6840 | { | |
916c5919 JM |
6841 | if (value.value) |
6842 | output_init_element (value.value, strict_string, | |
6843 | constructor_type, NULL_TREE, 1); | |
3e4093b6 | 6844 | constructor_fields = 0; |
8b6a5902 JJ |
6845 | } |
6846 | ||
3e4093b6 RS |
6847 | /* Handle range initializers either at this level or anywhere higher |
6848 | in the designator stack. */ | |
6849 | if (constructor_range_stack) | |
8b6a5902 | 6850 | { |
3e4093b6 RS |
6851 | struct constructor_range_stack *p, *range_stack; |
6852 | int finish = 0; | |
6853 | ||
6854 | range_stack = constructor_range_stack; | |
6855 | constructor_range_stack = 0; | |
6856 | while (constructor_stack != range_stack->stack) | |
8b6a5902 | 6857 | { |
366de0ce | 6858 | gcc_assert (constructor_stack->implicit); |
3e4093b6 | 6859 | process_init_element (pop_init_level (1)); |
8b6a5902 | 6860 | } |
3e4093b6 RS |
6861 | for (p = range_stack; |
6862 | !p->range_end || tree_int_cst_equal (p->index, p->range_end); | |
6863 | p = p->prev) | |
8b6a5902 | 6864 | { |
366de0ce | 6865 | gcc_assert (constructor_stack->implicit); |
3e4093b6 | 6866 | process_init_element (pop_init_level (1)); |
8b6a5902 | 6867 | } |
3e4093b6 RS |
6868 | |
6869 | p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node); | |
6870 | if (tree_int_cst_equal (p->index, p->range_end) && !p->prev) | |
6871 | finish = 1; | |
6872 | ||
6873 | while (1) | |
6874 | { | |
6875 | constructor_index = p->index; | |
6876 | constructor_fields = p->fields; | |
6877 | if (finish && p->range_end && p->index == p->range_start) | |
6878 | { | |
6879 | finish = 0; | |
6880 | p->prev = 0; | |
6881 | } | |
6882 | p = p->next; | |
6883 | if (!p) | |
6884 | break; | |
6885 | push_init_level (2); | |
6886 | p->stack = constructor_stack; | |
6887 | if (p->range_end && tree_int_cst_equal (p->index, p->range_end)) | |
6888 | p->index = p->range_start; | |
6889 | } | |
6890 | ||
6891 | if (!finish) | |
6892 | constructor_range_stack = range_stack; | |
6893 | continue; | |
8b6a5902 JJ |
6894 | } |
6895 | ||
3e4093b6 | 6896 | break; |
8b6a5902 JJ |
6897 | } |
6898 | ||
3e4093b6 RS |
6899 | constructor_range_stack = 0; |
6900 | } | |
6901 | \f | |
9f0e2d86 ZW |
6902 | /* Build a complete asm-statement, whose components are a CV_QUALIFIER |
6903 | (guaranteed to be 'volatile' or null) and ARGS (represented using | |
e130a54b | 6904 | an ASM_EXPR node). */ |
3e4093b6 | 6905 | tree |
9f0e2d86 | 6906 | build_asm_stmt (tree cv_qualifier, tree args) |
3e4093b6 | 6907 | { |
6de9cd9a DN |
6908 | if (!ASM_VOLATILE_P (args) && cv_qualifier) |
6909 | ASM_VOLATILE_P (args) = 1; | |
9f0e2d86 | 6910 | return add_stmt (args); |
8b6a5902 JJ |
6911 | } |
6912 | ||
9f0e2d86 ZW |
6913 | /* Build an asm-expr, whose components are a STRING, some OUTPUTS, |
6914 | some INPUTS, and some CLOBBERS. The latter three may be NULL. | |
6915 | SIMPLE indicates whether there was anything at all after the | |
6916 | string in the asm expression -- asm("blah") and asm("blah" : ) | |
e130a54b | 6917 | are subtly different. We use a ASM_EXPR node to represent this. */ |
3e4093b6 | 6918 | tree |
9f0e2d86 ZW |
6919 | build_asm_expr (tree string, tree outputs, tree inputs, tree clobbers, |
6920 | bool simple) | |
e5e809f4 | 6921 | { |
3e4093b6 | 6922 | tree tail; |
9f0e2d86 | 6923 | tree args; |
6de9cd9a DN |
6924 | int i; |
6925 | const char *constraint; | |
74f0c611 | 6926 | const char **oconstraints; |
6de9cd9a | 6927 | bool allows_mem, allows_reg, is_inout; |
74f0c611 | 6928 | int ninputs, noutputs; |
6de9cd9a DN |
6929 | |
6930 | ninputs = list_length (inputs); | |
6931 | noutputs = list_length (outputs); | |
74f0c611 RH |
6932 | oconstraints = (const char **) alloca (noutputs * sizeof (const char *)); |
6933 | ||
6934 | string = resolve_asm_operand_names (string, outputs, inputs); | |
3e4093b6 | 6935 | |
6de9cd9a DN |
6936 | /* Remove output conversions that change the type but not the mode. */ |
6937 | for (i = 0, tail = outputs; tail; ++i, tail = TREE_CHAIN (tail)) | |
e5e809f4 | 6938 | { |
3e4093b6 | 6939 | tree output = TREE_VALUE (tail); |
74f0c611 RH |
6940 | |
6941 | /* ??? Really, this should not be here. Users should be using a | |
6942 | proper lvalue, dammit. But there's a long history of using casts | |
6943 | in the output operands. In cases like longlong.h, this becomes a | |
6944 | primitive form of typechecking -- if the cast can be removed, then | |
6945 | the output operand had a type of the proper width; otherwise we'll | |
6946 | get an error. Gross, but ... */ | |
3e4093b6 | 6947 | STRIP_NOPS (output); |
74f0c611 RH |
6948 | |
6949 | if (!lvalue_or_else (output, lv_asm)) | |
6950 | output = error_mark_node; | |
8b6a5902 | 6951 | |
5544530a PB |
6952 | if (output != error_mark_node |
6953 | && (TREE_READONLY (output) | |
6954 | || TYPE_READONLY (TREE_TYPE (output)) | |
6955 | || ((TREE_CODE (TREE_TYPE (output)) == RECORD_TYPE | |
6956 | || TREE_CODE (TREE_TYPE (output)) == UNION_TYPE) | |
6957 | && C_TYPE_FIELDS_READONLY (TREE_TYPE (output))))) | |
6958 | readonly_error (output, lv_asm); | |
6959 | ||
6de9cd9a | 6960 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); |
74f0c611 RH |
6961 | oconstraints[i] = constraint; |
6962 | ||
6963 | if (parse_output_constraint (&constraint, i, ninputs, noutputs, | |
6964 | &allows_mem, &allows_reg, &is_inout)) | |
6965 | { | |
6966 | /* If the operand is going to end up in memory, | |
6967 | mark it addressable. */ | |
6968 | if (!allows_reg && !c_mark_addressable (output)) | |
6969 | output = error_mark_node; | |
6970 | } | |
6971 | else | |
c22cacf3 | 6972 | output = error_mark_node; |
3e4093b6 | 6973 | |
74f0c611 | 6974 | TREE_VALUE (tail) = output; |
8b6a5902 | 6975 | } |
3e4093b6 | 6976 | |
74f0c611 RH |
6977 | for (i = 0, tail = inputs; tail; ++i, tail = TREE_CHAIN (tail)) |
6978 | { | |
6979 | tree input; | |
6980 | ||
6981 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); | |
6982 | input = TREE_VALUE (tail); | |
6983 | ||
74f0c611 RH |
6984 | if (parse_input_constraint (&constraint, i, ninputs, noutputs, 0, |
6985 | oconstraints, &allows_mem, &allows_reg)) | |
6986 | { | |
6987 | /* If the operand is going to end up in memory, | |
6988 | mark it addressable. */ | |
b4c33883 AP |
6989 | if (!allows_reg && allows_mem) |
6990 | { | |
6991 | /* Strip the nops as we allow this case. FIXME, this really | |
6992 | should be rejected or made deprecated. */ | |
6993 | STRIP_NOPS (input); | |
6994 | if (!c_mark_addressable (input)) | |
6995 | input = error_mark_node; | |
6996 | } | |
74f0c611 RH |
6997 | } |
6998 | else | |
6999 | input = error_mark_node; | |
7000 | ||
7001 | TREE_VALUE (tail) = input; | |
7002 | } | |
3e4093b6 | 7003 | |
e130a54b | 7004 | args = build_stmt (ASM_EXPR, string, outputs, inputs, clobbers); |
9f0e2d86 | 7005 | |
5544530a PB |
7006 | /* asm statements without outputs, including simple ones, are treated |
7007 | as volatile. */ | |
7008 | ASM_INPUT_P (args) = simple; | |
7009 | ASM_VOLATILE_P (args) = (noutputs == 0); | |
74f0c611 | 7010 | |
9f0e2d86 | 7011 | return args; |
e5e809f4 | 7012 | } |
3e4093b6 | 7013 | \f |
506e2710 RH |
7014 | /* Generate a goto statement to LABEL. */ |
7015 | ||
7016 | tree | |
7017 | c_finish_goto_label (tree label) | |
7018 | { | |
7019 | tree decl = lookup_label (label); | |
7020 | if (!decl) | |
7021 | return NULL_TREE; | |
7022 | ||
16ef3acc JM |
7023 | if (C_DECL_UNJUMPABLE_STMT_EXPR (decl)) |
7024 | { | |
7025 | error ("jump into statement expression"); | |
7026 | return NULL_TREE; | |
7027 | } | |
7028 | ||
187230a7 JM |
7029 | if (C_DECL_UNJUMPABLE_VM (decl)) |
7030 | { | |
7031 | error ("jump into scope of identifier with variably modified type"); | |
7032 | return NULL_TREE; | |
7033 | } | |
7034 | ||
16ef3acc JM |
7035 | if (!C_DECL_UNDEFINABLE_STMT_EXPR (decl)) |
7036 | { | |
7037 | /* No jump from outside this statement expression context, so | |
7038 | record that there is a jump from within this context. */ | |
7039 | struct c_label_list *nlist; | |
7040 | nlist = XOBNEW (&parser_obstack, struct c_label_list); | |
187230a7 JM |
7041 | nlist->next = label_context_stack_se->labels_used; |
7042 | nlist->label = decl; | |
7043 | label_context_stack_se->labels_used = nlist; | |
7044 | } | |
7045 | ||
7046 | if (!C_DECL_UNDEFINABLE_VM (decl)) | |
7047 | { | |
7048 | /* No jump from outside this context context of identifiers with | |
7049 | variably modified type, so record that there is a jump from | |
7050 | within this context. */ | |
7051 | struct c_label_list *nlist; | |
7052 | nlist = XOBNEW (&parser_obstack, struct c_label_list); | |
7053 | nlist->next = label_context_stack_vm->labels_used; | |
16ef3acc | 7054 | nlist->label = decl; |
187230a7 | 7055 | label_context_stack_vm->labels_used = nlist; |
16ef3acc JM |
7056 | } |
7057 | ||
506e2710 | 7058 | TREE_USED (decl) = 1; |
53fb4de3 | 7059 | return add_stmt (build1 (GOTO_EXPR, void_type_node, decl)); |
506e2710 RH |
7060 | } |
7061 | ||
7062 | /* Generate a computed goto statement to EXPR. */ | |
7063 | ||
7064 | tree | |
7065 | c_finish_goto_ptr (tree expr) | |
7066 | { | |
7067 | if (pedantic) | |
bda67431 | 7068 | pedwarn ("ISO C forbids %<goto *expr;%>"); |
506e2710 | 7069 | expr = convert (ptr_type_node, expr); |
53fb4de3 | 7070 | return add_stmt (build1 (GOTO_EXPR, void_type_node, expr)); |
506e2710 RH |
7071 | } |
7072 | ||
5088b058 RH |
7073 | /* Generate a C `return' statement. RETVAL is the expression for what |
7074 | to return, or a null pointer for `return;' with no value. */ | |
de520661 | 7075 | |
506e2710 | 7076 | tree |
5088b058 | 7077 | c_finish_return (tree retval) |
3e4093b6 | 7078 | { |
0c9b182b JJ |
7079 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)), ret_stmt; |
7080 | bool no_warning = false; | |
3e4093b6 RS |
7081 | |
7082 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
d4ee4d25 | 7083 | warning (0, "function declared %<noreturn%> has a %<return%> statement"); |
3e4093b6 RS |
7084 | |
7085 | if (!retval) | |
de520661 | 7086 | { |
3e4093b6 RS |
7087 | current_function_returns_null = 1; |
7088 | if ((warn_return_type || flag_isoc99) | |
7089 | && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
0c9b182b JJ |
7090 | { |
7091 | pedwarn_c99 ("%<return%> with no value, in " | |
7092 | "function returning non-void"); | |
7093 | no_warning = true; | |
7094 | } | |
400fbf9f | 7095 | } |
3e4093b6 | 7096 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) |
de520661 | 7097 | { |
3e4093b6 | 7098 | current_function_returns_null = 1; |
2397c575 | 7099 | if (TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) |
bda67431 | 7100 | pedwarn ("%<return%> with a value, in function returning void"); |
2397c575 MLI |
7101 | else if (pedantic) |
7102 | pedwarn ("ISO C forbids %<return%> with expression, in function returning void"); | |
de520661 | 7103 | } |
3e4093b6 | 7104 | else |
de520661 | 7105 | { |
2ac2f164 | 7106 | tree t = convert_for_assignment (valtype, retval, ic_return, |
3e4093b6 RS |
7107 | NULL_TREE, NULL_TREE, 0); |
7108 | tree res = DECL_RESULT (current_function_decl); | |
7109 | tree inner; | |
7110 | ||
7111 | current_function_returns_value = 1; | |
7112 | if (t == error_mark_node) | |
506e2710 | 7113 | return NULL_TREE; |
3e4093b6 RS |
7114 | |
7115 | inner = t = convert (TREE_TYPE (res), t); | |
7116 | ||
7117 | /* Strip any conversions, additions, and subtractions, and see if | |
7118 | we are returning the address of a local variable. Warn if so. */ | |
7119 | while (1) | |
8b6a5902 | 7120 | { |
3e4093b6 | 7121 | switch (TREE_CODE (inner)) |
8b6a5902 | 7122 | { |
1043771b | 7123 | CASE_CONVERT: case NON_LVALUE_EXPR: |
3e4093b6 RS |
7124 | case PLUS_EXPR: |
7125 | inner = TREE_OPERAND (inner, 0); | |
7126 | continue; | |
7127 | ||
7128 | case MINUS_EXPR: | |
7129 | /* If the second operand of the MINUS_EXPR has a pointer | |
7130 | type (or is converted from it), this may be valid, so | |
7131 | don't give a warning. */ | |
7132 | { | |
7133 | tree op1 = TREE_OPERAND (inner, 1); | |
8b6a5902 | 7134 | |
3f75a254 | 7135 | while (!POINTER_TYPE_P (TREE_TYPE (op1)) |
1043771b TB |
7136 | && (CONVERT_EXPR_P (op1) |
7137 | || TREE_CODE (op1) == NON_LVALUE_EXPR)) | |
3e4093b6 | 7138 | op1 = TREE_OPERAND (op1, 0); |
8b6a5902 | 7139 | |
3e4093b6 RS |
7140 | if (POINTER_TYPE_P (TREE_TYPE (op1))) |
7141 | break; | |
8b6a5902 | 7142 | |
3e4093b6 RS |
7143 | inner = TREE_OPERAND (inner, 0); |
7144 | continue; | |
7145 | } | |
400fbf9f | 7146 | |
3e4093b6 RS |
7147 | case ADDR_EXPR: |
7148 | inner = TREE_OPERAND (inner, 0); | |
c2f4acb7 | 7149 | |
6615c446 | 7150 | while (REFERENCE_CLASS_P (inner) |
c22cacf3 | 7151 | && TREE_CODE (inner) != INDIRECT_REF) |
3e4093b6 | 7152 | inner = TREE_OPERAND (inner, 0); |
8b6a5902 | 7153 | |
a2f1f4c3 | 7154 | if (DECL_P (inner) |
3f75a254 JM |
7155 | && !DECL_EXTERNAL (inner) |
7156 | && !TREE_STATIC (inner) | |
3e4093b6 | 7157 | && DECL_CONTEXT (inner) == current_function_decl) |
d4ee4d25 | 7158 | warning (0, "function returns address of local variable"); |
3e4093b6 | 7159 | break; |
8b6a5902 | 7160 | |
3e4093b6 RS |
7161 | default: |
7162 | break; | |
7163 | } | |
de520661 | 7164 | |
3e4093b6 RS |
7165 | break; |
7166 | } | |
7167 | ||
53fb4de3 | 7168 | retval = build2 (MODIFY_EXPR, TREE_TYPE (res), res, t); |
de520661 | 7169 | } |
8b6a5902 | 7170 | |
0c9b182b JJ |
7171 | ret_stmt = build_stmt (RETURN_EXPR, retval); |
7172 | TREE_NO_WARNING (ret_stmt) |= no_warning; | |
7173 | return add_stmt (ret_stmt); | |
de520661 | 7174 | } |
3e4093b6 RS |
7175 | \f |
7176 | struct c_switch { | |
604f5adf ILT |
7177 | /* The SWITCH_EXPR being built. */ |
7178 | tree switch_expr; | |
a6c0a76c | 7179 | |
89dbed81 | 7180 | /* The original type of the testing expression, i.e. before the |
a6c0a76c SB |
7181 | default conversion is applied. */ |
7182 | tree orig_type; | |
7183 | ||
3e4093b6 RS |
7184 | /* A splay-tree mapping the low element of a case range to the high |
7185 | element, or NULL_TREE if there is no high element. Used to | |
7186 | determine whether or not a new case label duplicates an old case | |
7187 | label. We need a tree, rather than simply a hash table, because | |
7188 | of the GNU case range extension. */ | |
7189 | splay_tree cases; | |
a6c0a76c | 7190 | |
16ef3acc JM |
7191 | /* Number of nested statement expressions within this switch |
7192 | statement; if nonzero, case and default labels may not | |
7193 | appear. */ | |
7194 | unsigned int blocked_stmt_expr; | |
7195 | ||
187230a7 JM |
7196 | /* Scope of outermost declarations of identifiers with variably |
7197 | modified type within this switch statement; if nonzero, case and | |
7198 | default labels may not appear. */ | |
7199 | unsigned int blocked_vm; | |
7200 | ||
3e4093b6 RS |
7201 | /* The next node on the stack. */ |
7202 | struct c_switch *next; | |
7203 | }; | |
400fbf9f | 7204 | |
3e4093b6 RS |
7205 | /* A stack of the currently active switch statements. The innermost |
7206 | switch statement is on the top of the stack. There is no need to | |
7207 | mark the stack for garbage collection because it is only active | |
7208 | during the processing of the body of a function, and we never | |
7209 | collect at that point. */ | |
de520661 | 7210 | |
506e2710 | 7211 | struct c_switch *c_switch_stack; |
de520661 | 7212 | |
3e4093b6 | 7213 | /* Start a C switch statement, testing expression EXP. Return the new |
604f5adf | 7214 | SWITCH_EXPR. */ |
de520661 | 7215 | |
3e4093b6 RS |
7216 | tree |
7217 | c_start_case (tree exp) | |
de520661 | 7218 | { |
c58e8676 | 7219 | tree orig_type = error_mark_node; |
3e4093b6 | 7220 | struct c_switch *cs; |
2f6e4e97 | 7221 | |
3e4093b6 | 7222 | if (exp != error_mark_node) |
de520661 | 7223 | { |
3e4093b6 RS |
7224 | orig_type = TREE_TYPE (exp); |
7225 | ||
c58e8676 | 7226 | if (!INTEGRAL_TYPE_P (orig_type)) |
de520661 | 7227 | { |
c58e8676 VR |
7228 | if (orig_type != error_mark_node) |
7229 | { | |
7230 | error ("switch quantity not an integer"); | |
7231 | orig_type = error_mark_node; | |
7232 | } | |
3e4093b6 | 7233 | exp = integer_zero_node; |
de520661 | 7234 | } |
3e4093b6 | 7235 | else |
de520661 | 7236 | { |
c58e8676 | 7237 | tree type = TYPE_MAIN_VARIANT (orig_type); |
8b6a5902 | 7238 | |
3176a0c2 | 7239 | if (!in_system_header |
3e4093b6 RS |
7240 | && (type == long_integer_type_node |
7241 | || type == long_unsigned_type_node)) | |
3176a0c2 DD |
7242 | warning (OPT_Wtraditional, "%<long%> switch expression not " |
7243 | "converted to %<int%> in ISO C"); | |
8b6a5902 | 7244 | |
3e4093b6 | 7245 | exp = default_conversion (exp); |
3e4093b6 RS |
7246 | } |
7247 | } | |
7248 | ||
604f5adf | 7249 | /* Add this new SWITCH_EXPR to the stack. */ |
5d038c4c | 7250 | cs = XNEW (struct c_switch); |
604f5adf | 7251 | cs->switch_expr = build3 (SWITCH_EXPR, orig_type, exp, NULL_TREE, NULL_TREE); |
a6c0a76c | 7252 | cs->orig_type = orig_type; |
3e4093b6 | 7253 | cs->cases = splay_tree_new (case_compare, NULL, NULL); |
16ef3acc | 7254 | cs->blocked_stmt_expr = 0; |
187230a7 | 7255 | cs->blocked_vm = 0; |
506e2710 RH |
7256 | cs->next = c_switch_stack; |
7257 | c_switch_stack = cs; | |
3e4093b6 | 7258 | |
604f5adf | 7259 | return add_stmt (cs->switch_expr); |
3e4093b6 RS |
7260 | } |
7261 | ||
7262 | /* Process a case label. */ | |
7263 | ||
7264 | tree | |
7265 | do_case (tree low_value, tree high_value) | |
7266 | { | |
7267 | tree label = NULL_TREE; | |
7268 | ||
187230a7 JM |
7269 | if (c_switch_stack && !c_switch_stack->blocked_stmt_expr |
7270 | && !c_switch_stack->blocked_vm) | |
3e4093b6 | 7271 | { |
506e2710 | 7272 | label = c_add_case_label (c_switch_stack->cases, |
604f5adf | 7273 | SWITCH_COND (c_switch_stack->switch_expr), |
a6c0a76c | 7274 | c_switch_stack->orig_type, |
3e4093b6 RS |
7275 | low_value, high_value); |
7276 | if (label == error_mark_node) | |
7277 | label = NULL_TREE; | |
de520661 | 7278 | } |
16ef3acc JM |
7279 | else if (c_switch_stack && c_switch_stack->blocked_stmt_expr) |
7280 | { | |
7281 | if (low_value) | |
7282 | error ("case label in statement expression not containing " | |
7283 | "enclosing switch statement"); | |
7284 | else | |
7285 | error ("%<default%> label in statement expression not containing " | |
7286 | "enclosing switch statement"); | |
7287 | } | |
187230a7 JM |
7288 | else if (c_switch_stack && c_switch_stack->blocked_vm) |
7289 | { | |
7290 | if (low_value) | |
7291 | error ("case label in scope of identifier with variably modified " | |
7292 | "type not containing enclosing switch statement"); | |
7293 | else | |
7294 | error ("%<default%> label in scope of identifier with variably " | |
7295 | "modified type not containing enclosing switch statement"); | |
7296 | } | |
3e4093b6 RS |
7297 | else if (low_value) |
7298 | error ("case label not within a switch statement"); | |
7299 | else | |
bda67431 | 7300 | error ("%<default%> label not within a switch statement"); |
de520661 | 7301 | |
3e4093b6 RS |
7302 | return label; |
7303 | } | |
de520661 | 7304 | |
3e4093b6 | 7305 | /* Finish the switch statement. */ |
de520661 | 7306 | |
3e4093b6 | 7307 | void |
325c3691 | 7308 | c_finish_case (tree body) |
3e4093b6 | 7309 | { |
506e2710 | 7310 | struct c_switch *cs = c_switch_stack; |
fbc315db | 7311 | location_t switch_location; |
3e4093b6 | 7312 | |
604f5adf | 7313 | SWITCH_BODY (cs->switch_expr) = body; |
325c3691 | 7314 | |
187230a7 JM |
7315 | /* We must not be within a statement expression nested in the switch |
7316 | at this point; we might, however, be within the scope of an | |
7317 | identifier with variably modified type nested in the switch. */ | |
16ef3acc JM |
7318 | gcc_assert (!cs->blocked_stmt_expr); |
7319 | ||
6de9cd9a | 7320 | /* Emit warnings as needed. */ |
fbc315db ILT |
7321 | if (EXPR_HAS_LOCATION (cs->switch_expr)) |
7322 | switch_location = EXPR_LOCATION (cs->switch_expr); | |
7323 | else | |
7324 | switch_location = input_location; | |
7325 | c_do_switch_warnings (cs->cases, switch_location, | |
7326 | TREE_TYPE (cs->switch_expr), | |
7327 | SWITCH_COND (cs->switch_expr)); | |
6de9cd9a | 7328 | |
3e4093b6 | 7329 | /* Pop the stack. */ |
506e2710 | 7330 | c_switch_stack = cs->next; |
3e4093b6 | 7331 | splay_tree_delete (cs->cases); |
5d038c4c | 7332 | XDELETE (cs); |
de520661 | 7333 | } |
325c3691 | 7334 | \f |
506e2710 RH |
7335 | /* Emit an if statement. IF_LOCUS is the location of the 'if'. COND, |
7336 | THEN_BLOCK and ELSE_BLOCK are expressions to be used; ELSE_BLOCK | |
7337 | may be null. NESTED_IF is true if THEN_BLOCK contains another IF | |
7338 | statement, and was not surrounded with parenthesis. */ | |
325c3691 | 7339 | |
9e51cf9d | 7340 | void |
506e2710 RH |
7341 | c_finish_if_stmt (location_t if_locus, tree cond, tree then_block, |
7342 | tree else_block, bool nested_if) | |
325c3691 | 7343 | { |
506e2710 | 7344 | tree stmt; |
325c3691 | 7345 | |
506e2710 RH |
7346 | /* Diagnose an ambiguous else if if-then-else is nested inside if-then. */ |
7347 | if (warn_parentheses && nested_if && else_block == NULL) | |
325c3691 | 7348 | { |
506e2710 | 7349 | tree inner_if = then_block; |
16865eaa | 7350 | |
61ada8ae | 7351 | /* We know from the grammar productions that there is an IF nested |
506e2710 RH |
7352 | within THEN_BLOCK. Due to labels and c99 conditional declarations, |
7353 | it might not be exactly THEN_BLOCK, but should be the last | |
7354 | non-container statement within. */ | |
7355 | while (1) | |
7356 | switch (TREE_CODE (inner_if)) | |
7357 | { | |
7358 | case COND_EXPR: | |
7359 | goto found; | |
7360 | case BIND_EXPR: | |
7361 | inner_if = BIND_EXPR_BODY (inner_if); | |
7362 | break; | |
7363 | case STATEMENT_LIST: | |
7364 | inner_if = expr_last (then_block); | |
7365 | break; | |
7366 | case TRY_FINALLY_EXPR: | |
7367 | case TRY_CATCH_EXPR: | |
7368 | inner_if = TREE_OPERAND (inner_if, 0); | |
7369 | break; | |
7370 | default: | |
366de0ce | 7371 | gcc_unreachable (); |
506e2710 RH |
7372 | } |
7373 | found: | |
16865eaa | 7374 | |
506e2710 | 7375 | if (COND_EXPR_ELSE (inner_if)) |
c303630a DD |
7376 | warning (OPT_Wparentheses, |
7377 | "%Hsuggest explicit braces to avoid ambiguous %<else%>", | |
506e2710 RH |
7378 | &if_locus); |
7379 | } | |
16865eaa | 7380 | |
62e00e94 | 7381 | empty_if_body_warning (then_block, else_block); |
325c3691 | 7382 | |
2214de30 | 7383 | stmt = build3 (COND_EXPR, void_type_node, cond, then_block, else_block); |
a281759f | 7384 | SET_EXPR_LOCATION (stmt, if_locus); |
506e2710 | 7385 | add_stmt (stmt); |
325c3691 RH |
7386 | } |
7387 | ||
506e2710 RH |
7388 | /* Emit a general-purpose loop construct. START_LOCUS is the location of |
7389 | the beginning of the loop. COND is the loop condition. COND_IS_FIRST | |
7390 | is false for DO loops. INCR is the FOR increment expression. BODY is | |
61ada8ae | 7391 | the statement controlled by the loop. BLAB is the break label. CLAB is |
506e2710 | 7392 | the continue label. Everything is allowed to be NULL. */ |
325c3691 RH |
7393 | |
7394 | void | |
506e2710 RH |
7395 | c_finish_loop (location_t start_locus, tree cond, tree incr, tree body, |
7396 | tree blab, tree clab, bool cond_is_first) | |
325c3691 | 7397 | { |
506e2710 RH |
7398 | tree entry = NULL, exit = NULL, t; |
7399 | ||
28af952a RS |
7400 | /* If the condition is zero don't generate a loop construct. */ |
7401 | if (cond && integer_zerop (cond)) | |
7402 | { | |
7403 | if (cond_is_first) | |
7404 | { | |
7405 | t = build_and_jump (&blab); | |
7406 | SET_EXPR_LOCATION (t, start_locus); | |
7407 | add_stmt (t); | |
7408 | } | |
7409 | } | |
7410 | else | |
506e2710 RH |
7411 | { |
7412 | tree top = build1 (LABEL_EXPR, void_type_node, NULL_TREE); | |
c22cacf3 | 7413 | |
506e2710 | 7414 | /* If we have an exit condition, then we build an IF with gotos either |
c22cacf3 MS |
7415 | out of the loop, or to the top of it. If there's no exit condition, |
7416 | then we just build a jump back to the top. */ | |
506e2710 | 7417 | exit = build_and_jump (&LABEL_EXPR_LABEL (top)); |
c22cacf3 | 7418 | |
28af952a | 7419 | if (cond && !integer_nonzerop (cond)) |
c22cacf3 MS |
7420 | { |
7421 | /* Canonicalize the loop condition to the end. This means | |
7422 | generating a branch to the loop condition. Reuse the | |
7423 | continue label, if possible. */ | |
7424 | if (cond_is_first) | |
7425 | { | |
7426 | if (incr || !clab) | |
7427 | { | |
7428 | entry = build1 (LABEL_EXPR, void_type_node, NULL_TREE); | |
7429 | t = build_and_jump (&LABEL_EXPR_LABEL (entry)); | |
7430 | } | |
7431 | else | |
7432 | t = build1 (GOTO_EXPR, void_type_node, clab); | |
a281759f | 7433 | SET_EXPR_LOCATION (t, start_locus); |
c22cacf3 MS |
7434 | add_stmt (t); |
7435 | } | |
7436 | ||
506e2710 | 7437 | t = build_and_jump (&blab); |
c22cacf3 | 7438 | exit = fold_build3 (COND_EXPR, void_type_node, cond, exit, t); |
506e2710 | 7439 | if (cond_is_first) |
c22cacf3 | 7440 | SET_EXPR_LOCATION (exit, start_locus); |
506e2710 | 7441 | else |
c22cacf3 MS |
7442 | SET_EXPR_LOCATION (exit, input_location); |
7443 | } | |
7444 | ||
506e2710 RH |
7445 | add_stmt (top); |
7446 | } | |
c22cacf3 | 7447 | |
506e2710 RH |
7448 | if (body) |
7449 | add_stmt (body); | |
7450 | if (clab) | |
7451 | add_stmt (build1 (LABEL_EXPR, void_type_node, clab)); | |
7452 | if (incr) | |
7453 | add_stmt (incr); | |
7454 | if (entry) | |
7455 | add_stmt (entry); | |
7456 | if (exit) | |
7457 | add_stmt (exit); | |
7458 | if (blab) | |
7459 | add_stmt (build1 (LABEL_EXPR, void_type_node, blab)); | |
325c3691 | 7460 | } |
325c3691 RH |
7461 | |
7462 | tree | |
506e2710 | 7463 | c_finish_bc_stmt (tree *label_p, bool is_break) |
325c3691 | 7464 | { |
089efaa4 | 7465 | bool skip; |
506e2710 | 7466 | tree label = *label_p; |
325c3691 | 7467 | |
089efaa4 ILT |
7468 | /* In switch statements break is sometimes stylistically used after |
7469 | a return statement. This can lead to spurious warnings about | |
7470 | control reaching the end of a non-void function when it is | |
7471 | inlined. Note that we are calling block_may_fallthru with | |
7472 | language specific tree nodes; this works because | |
7473 | block_may_fallthru returns true when given something it does not | |
7474 | understand. */ | |
7475 | skip = !block_may_fallthru (cur_stmt_list); | |
7476 | ||
506e2710 | 7477 | if (!label) |
089efaa4 ILT |
7478 | { |
7479 | if (!skip) | |
7480 | *label_p = label = create_artificial_label (); | |
7481 | } | |
953ff289 DN |
7482 | else if (TREE_CODE (label) == LABEL_DECL) |
7483 | ; | |
7484 | else switch (TREE_INT_CST_LOW (label)) | |
506e2710 | 7485 | { |
953ff289 | 7486 | case 0: |
506e2710 RH |
7487 | if (is_break) |
7488 | error ("break statement not within loop or switch"); | |
7489 | else | |
c22cacf3 | 7490 | error ("continue statement not within a loop"); |
506e2710 | 7491 | return NULL_TREE; |
953ff289 DN |
7492 | |
7493 | case 1: | |
7494 | gcc_assert (is_break); | |
7495 | error ("break statement used with OpenMP for loop"); | |
7496 | return NULL_TREE; | |
7497 | ||
7498 | default: | |
7499 | gcc_unreachable (); | |
506e2710 | 7500 | } |
325c3691 | 7501 | |
089efaa4 ILT |
7502 | if (skip) |
7503 | return NULL_TREE; | |
7504 | ||
2e28e797 JH |
7505 | if (!is_break) |
7506 | add_stmt (build_predict_expr (PRED_CONTINUE, NOT_TAKEN)); | |
7507 | ||
53fb4de3 | 7508 | return add_stmt (build1 (GOTO_EXPR, void_type_node, label)); |
325c3691 RH |
7509 | } |
7510 | ||
506e2710 | 7511 | /* A helper routine for c_process_expr_stmt and c_finish_stmt_expr. */ |
3a5b9284 RH |
7512 | |
7513 | static void | |
7514 | emit_side_effect_warnings (tree expr) | |
7515 | { | |
e6b5a630 RH |
7516 | if (expr == error_mark_node) |
7517 | ; | |
7518 | else if (!TREE_SIDE_EFFECTS (expr)) | |
3a5b9284 RH |
7519 | { |
7520 | if (!VOID_TYPE_P (TREE_TYPE (expr)) && !TREE_NO_WARNING (expr)) | |
27f33b15 | 7521 | warning (OPT_Wunused_value, "%Hstatement with no effect", |
607bdeaa | 7522 | EXPR_HAS_LOCATION (expr) ? EXPR_LOCUS (expr) : &input_location); |
3a5b9284 | 7523 | } |
27f33b15 | 7524 | else |
3a5b9284 RH |
7525 | warn_if_unused_value (expr, input_location); |
7526 | } | |
7527 | ||
506e2710 RH |
7528 | /* Process an expression as if it were a complete statement. Emit |
7529 | diagnostics, but do not call ADD_STMT. */ | |
3a5b9284 | 7530 | |
506e2710 RH |
7531 | tree |
7532 | c_process_expr_stmt (tree expr) | |
3a5b9284 RH |
7533 | { |
7534 | if (!expr) | |
506e2710 | 7535 | return NULL_TREE; |
3a5b9284 | 7536 | |
3a5b9284 RH |
7537 | if (warn_sequence_point) |
7538 | verify_sequence_points (expr); | |
7539 | ||
7540 | if (TREE_TYPE (expr) != error_mark_node | |
7541 | && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr)) | |
7542 | && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE) | |
7543 | error ("expression statement has incomplete type"); | |
7544 | ||
7545 | /* If we're not processing a statement expression, warn about unused values. | |
7546 | Warnings for statement expressions will be emitted later, once we figure | |
7547 | out which is the result. */ | |
7548 | if (!STATEMENT_LIST_STMT_EXPR (cur_stmt_list) | |
27f33b15 | 7549 | && warn_unused_value) |
3a5b9284 RH |
7550 | emit_side_effect_warnings (expr); |
7551 | ||
7552 | /* If the expression is not of a type to which we cannot assign a line | |
7553 | number, wrap the thing in a no-op NOP_EXPR. */ | |
6615c446 | 7554 | if (DECL_P (expr) || CONSTANT_CLASS_P (expr)) |
3a5b9284 RH |
7555 | expr = build1 (NOP_EXPR, TREE_TYPE (expr), expr); |
7556 | ||
07beea0d | 7557 | if (CAN_HAVE_LOCATION_P (expr)) |
a281759f | 7558 | SET_EXPR_LOCATION (expr, input_location); |
506e2710 RH |
7559 | |
7560 | return expr; | |
7561 | } | |
7562 | ||
7563 | /* Emit an expression as a statement. */ | |
7564 | ||
7565 | tree | |
7566 | c_finish_expr_stmt (tree expr) | |
7567 | { | |
7568 | if (expr) | |
7569 | return add_stmt (c_process_expr_stmt (expr)); | |
7570 | else | |
7571 | return NULL; | |
3a5b9284 RH |
7572 | } |
7573 | ||
7574 | /* Do the opposite and emit a statement as an expression. To begin, | |
7575 | create a new binding level and return it. */ | |
325c3691 RH |
7576 | |
7577 | tree | |
7578 | c_begin_stmt_expr (void) | |
7579 | { | |
7580 | tree ret; | |
187230a7 | 7581 | struct c_label_context_se *nstack; |
16ef3acc | 7582 | struct c_label_list *glist; |
325c3691 RH |
7583 | |
7584 | /* We must force a BLOCK for this level so that, if it is not expanded | |
7585 | later, there is a way to turn off the entire subtree of blocks that | |
7586 | are contained in it. */ | |
7587 | keep_next_level (); | |
7588 | ret = c_begin_compound_stmt (true); | |
16ef3acc JM |
7589 | if (c_switch_stack) |
7590 | { | |
7591 | c_switch_stack->blocked_stmt_expr++; | |
7592 | gcc_assert (c_switch_stack->blocked_stmt_expr != 0); | |
7593 | } | |
187230a7 | 7594 | for (glist = label_context_stack_se->labels_used; |
16ef3acc JM |
7595 | glist != NULL; |
7596 | glist = glist->next) | |
7597 | { | |
7598 | C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 1; | |
7599 | } | |
187230a7 | 7600 | nstack = XOBNEW (&parser_obstack, struct c_label_context_se); |
16ef3acc JM |
7601 | nstack->labels_def = NULL; |
7602 | nstack->labels_used = NULL; | |
187230a7 JM |
7603 | nstack->next = label_context_stack_se; |
7604 | label_context_stack_se = nstack; | |
325c3691 RH |
7605 | |
7606 | /* Mark the current statement list as belonging to a statement list. */ | |
7607 | STATEMENT_LIST_STMT_EXPR (ret) = 1; | |
7608 | ||
7609 | return ret; | |
7610 | } | |
7611 | ||
7612 | tree | |
7613 | c_finish_stmt_expr (tree body) | |
7614 | { | |
3a5b9284 | 7615 | tree last, type, tmp, val; |
325c3691 | 7616 | tree *last_p; |
16ef3acc | 7617 | struct c_label_list *dlist, *glist, *glist_prev = NULL; |
325c3691 RH |
7618 | |
7619 | body = c_end_compound_stmt (body, true); | |
16ef3acc JM |
7620 | if (c_switch_stack) |
7621 | { | |
7622 | gcc_assert (c_switch_stack->blocked_stmt_expr != 0); | |
7623 | c_switch_stack->blocked_stmt_expr--; | |
7624 | } | |
7625 | /* It is no longer possible to jump to labels defined within this | |
7626 | statement expression. */ | |
187230a7 | 7627 | for (dlist = label_context_stack_se->labels_def; |
16ef3acc JM |
7628 | dlist != NULL; |
7629 | dlist = dlist->next) | |
7630 | { | |
7631 | C_DECL_UNJUMPABLE_STMT_EXPR (dlist->label) = 1; | |
7632 | } | |
7633 | /* It is again possible to define labels with a goto just outside | |
7634 | this statement expression. */ | |
187230a7 | 7635 | for (glist = label_context_stack_se->next->labels_used; |
16ef3acc JM |
7636 | glist != NULL; |
7637 | glist = glist->next) | |
7638 | { | |
7639 | C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 0; | |
7640 | glist_prev = glist; | |
7641 | } | |
7642 | if (glist_prev != NULL) | |
187230a7 | 7643 | glist_prev->next = label_context_stack_se->labels_used; |
16ef3acc | 7644 | else |
187230a7 JM |
7645 | label_context_stack_se->next->labels_used |
7646 | = label_context_stack_se->labels_used; | |
7647 | label_context_stack_se = label_context_stack_se->next; | |
325c3691 | 7648 | |
3a5b9284 RH |
7649 | /* Locate the last statement in BODY. See c_end_compound_stmt |
7650 | about always returning a BIND_EXPR. */ | |
7651 | last_p = &BIND_EXPR_BODY (body); | |
7652 | last = BIND_EXPR_BODY (body); | |
7653 | ||
7654 | continue_searching: | |
325c3691 RH |
7655 | if (TREE_CODE (last) == STATEMENT_LIST) |
7656 | { | |
3a5b9284 RH |
7657 | tree_stmt_iterator i; |
7658 | ||
7659 | /* This can happen with degenerate cases like ({ }). No value. */ | |
7660 | if (!TREE_SIDE_EFFECTS (last)) | |
7661 | return body; | |
7662 | ||
7663 | /* If we're supposed to generate side effects warnings, process | |
7664 | all of the statements except the last. */ | |
27f33b15 | 7665 | if (warn_unused_value) |
325c3691 | 7666 | { |
3a5b9284 RH |
7667 | for (i = tsi_start (last); !tsi_one_before_end_p (i); tsi_next (&i)) |
7668 | emit_side_effect_warnings (tsi_stmt (i)); | |
325c3691 RH |
7669 | } |
7670 | else | |
3a5b9284 RH |
7671 | i = tsi_last (last); |
7672 | last_p = tsi_stmt_ptr (i); | |
7673 | last = *last_p; | |
325c3691 RH |
7674 | } |
7675 | ||
3a5b9284 RH |
7676 | /* If the end of the list is exception related, then the list was split |
7677 | by a call to push_cleanup. Continue searching. */ | |
7678 | if (TREE_CODE (last) == TRY_FINALLY_EXPR | |
7679 | || TREE_CODE (last) == TRY_CATCH_EXPR) | |
7680 | { | |
7681 | last_p = &TREE_OPERAND (last, 0); | |
7682 | last = *last_p; | |
7683 | goto continue_searching; | |
7684 | } | |
7685 | ||
7686 | /* In the case that the BIND_EXPR is not necessary, return the | |
7687 | expression out from inside it. */ | |
e6b5a630 RH |
7688 | if (last == error_mark_node |
7689 | || (last == BIND_EXPR_BODY (body) | |
7690 | && BIND_EXPR_VARS (body) == NULL)) | |
591baeb0 JM |
7691 | { |
7692 | /* Do not warn if the return value of a statement expression is | |
7693 | unused. */ | |
07beea0d | 7694 | if (CAN_HAVE_LOCATION_P (last)) |
591baeb0 JM |
7695 | TREE_NO_WARNING (last) = 1; |
7696 | return last; | |
7697 | } | |
325c3691 RH |
7698 | |
7699 | /* Extract the type of said expression. */ | |
7700 | type = TREE_TYPE (last); | |
325c3691 | 7701 | |
3a5b9284 RH |
7702 | /* If we're not returning a value at all, then the BIND_EXPR that |
7703 | we already have is a fine expression to return. */ | |
7704 | if (!type || VOID_TYPE_P (type)) | |
7705 | return body; | |
7706 | ||
7707 | /* Now that we've located the expression containing the value, it seems | |
7708 | silly to make voidify_wrapper_expr repeat the process. Create a | |
7709 | temporary of the appropriate type and stick it in a TARGET_EXPR. */ | |
7710 | tmp = create_tmp_var_raw (type, NULL); | |
7711 | ||
7712 | /* Unwrap a no-op NOP_EXPR as added by c_finish_expr_stmt. This avoids | |
7713 | tree_expr_nonnegative_p giving up immediately. */ | |
7714 | val = last; | |
7715 | if (TREE_CODE (val) == NOP_EXPR | |
7716 | && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0))) | |
7717 | val = TREE_OPERAND (val, 0); | |
7718 | ||
53fb4de3 | 7719 | *last_p = build2 (MODIFY_EXPR, void_type_node, tmp, val); |
3a5b9284 RH |
7720 | SET_EXPR_LOCUS (*last_p, EXPR_LOCUS (last)); |
7721 | ||
53fb4de3 | 7722 | return build4 (TARGET_EXPR, type, tmp, body, NULL_TREE, NULL_TREE); |
325c3691 | 7723 | } |
187230a7 JM |
7724 | |
7725 | /* Begin the scope of an identifier of variably modified type, scope | |
7726 | number SCOPE. Jumping from outside this scope to inside it is not | |
7727 | permitted. */ | |
7728 | ||
7729 | void | |
7730 | c_begin_vm_scope (unsigned int scope) | |
7731 | { | |
7732 | struct c_label_context_vm *nstack; | |
7733 | struct c_label_list *glist; | |
7734 | ||
7735 | gcc_assert (scope > 0); | |
71d0c100 MS |
7736 | |
7737 | /* At file_scope, we don't have to do any processing. */ | |
7738 | if (label_context_stack_vm == NULL) | |
7739 | return; | |
7740 | ||
187230a7 JM |
7741 | if (c_switch_stack && !c_switch_stack->blocked_vm) |
7742 | c_switch_stack->blocked_vm = scope; | |
7743 | for (glist = label_context_stack_vm->labels_used; | |
7744 | glist != NULL; | |
7745 | glist = glist->next) | |
7746 | { | |
7747 | C_DECL_UNDEFINABLE_VM (glist->label) = 1; | |
7748 | } | |
7749 | nstack = XOBNEW (&parser_obstack, struct c_label_context_vm); | |
7750 | nstack->labels_def = NULL; | |
7751 | nstack->labels_used = NULL; | |
7752 | nstack->scope = scope; | |
7753 | nstack->next = label_context_stack_vm; | |
7754 | label_context_stack_vm = nstack; | |
7755 | } | |
7756 | ||
7757 | /* End a scope which may contain identifiers of variably modified | |
7758 | type, scope number SCOPE. */ | |
7759 | ||
7760 | void | |
7761 | c_end_vm_scope (unsigned int scope) | |
7762 | { | |
7763 | if (label_context_stack_vm == NULL) | |
7764 | return; | |
7765 | if (c_switch_stack && c_switch_stack->blocked_vm == scope) | |
7766 | c_switch_stack->blocked_vm = 0; | |
7767 | /* We may have a number of nested scopes of identifiers with | |
7768 | variably modified type, all at this depth. Pop each in turn. */ | |
7769 | while (label_context_stack_vm->scope == scope) | |
7770 | { | |
7771 | struct c_label_list *dlist, *glist, *glist_prev = NULL; | |
7772 | ||
7773 | /* It is no longer possible to jump to labels defined within this | |
7774 | scope. */ | |
7775 | for (dlist = label_context_stack_vm->labels_def; | |
7776 | dlist != NULL; | |
7777 | dlist = dlist->next) | |
7778 | { | |
7779 | C_DECL_UNJUMPABLE_VM (dlist->label) = 1; | |
7780 | } | |
7781 | /* It is again possible to define labels with a goto just outside | |
7782 | this scope. */ | |
7783 | for (glist = label_context_stack_vm->next->labels_used; | |
7784 | glist != NULL; | |
7785 | glist = glist->next) | |
7786 | { | |
7787 | C_DECL_UNDEFINABLE_VM (glist->label) = 0; | |
7788 | glist_prev = glist; | |
7789 | } | |
7790 | if (glist_prev != NULL) | |
7791 | glist_prev->next = label_context_stack_vm->labels_used; | |
7792 | else | |
7793 | label_context_stack_vm->next->labels_used | |
7794 | = label_context_stack_vm->labels_used; | |
7795 | label_context_stack_vm = label_context_stack_vm->next; | |
7796 | } | |
7797 | } | |
325c3691 RH |
7798 | \f |
7799 | /* Begin and end compound statements. This is as simple as pushing | |
7800 | and popping new statement lists from the tree. */ | |
7801 | ||
7802 | tree | |
7803 | c_begin_compound_stmt (bool do_scope) | |
7804 | { | |
7805 | tree stmt = push_stmt_list (); | |
7806 | if (do_scope) | |
4dfa0342 | 7807 | push_scope (); |
325c3691 RH |
7808 | return stmt; |
7809 | } | |
7810 | ||
7811 | tree | |
7812 | c_end_compound_stmt (tree stmt, bool do_scope) | |
7813 | { | |
7814 | tree block = NULL; | |
7815 | ||
7816 | if (do_scope) | |
7817 | { | |
7818 | if (c_dialect_objc ()) | |
7819 | objc_clear_super_receiver (); | |
7820 | block = pop_scope (); | |
7821 | } | |
7822 | ||
7823 | stmt = pop_stmt_list (stmt); | |
7824 | stmt = c_build_bind_expr (block, stmt); | |
7825 | ||
7826 | /* If this compound statement is nested immediately inside a statement | |
7827 | expression, then force a BIND_EXPR to be created. Otherwise we'll | |
7828 | do the wrong thing for ({ { 1; } }) or ({ 1; { } }). In particular, | |
7829 | STATEMENT_LISTs merge, and thus we can lose track of what statement | |
7830 | was really last. */ | |
7831 | if (cur_stmt_list | |
7832 | && STATEMENT_LIST_STMT_EXPR (cur_stmt_list) | |
7833 | && TREE_CODE (stmt) != BIND_EXPR) | |
7834 | { | |
53fb4de3 | 7835 | stmt = build3 (BIND_EXPR, void_type_node, NULL, stmt, NULL); |
325c3691 RH |
7836 | TREE_SIDE_EFFECTS (stmt) = 1; |
7837 | } | |
7838 | ||
7839 | return stmt; | |
7840 | } | |
5a508662 RH |
7841 | |
7842 | /* Queue a cleanup. CLEANUP is an expression/statement to be executed | |
7843 | when the current scope is exited. EH_ONLY is true when this is not | |
7844 | meant to apply to normal control flow transfer. */ | |
7845 | ||
7846 | void | |
e18476eb | 7847 | push_cleanup (tree ARG_UNUSED (decl), tree cleanup, bool eh_only) |
5a508662 | 7848 | { |
3a5b9284 RH |
7849 | enum tree_code code; |
7850 | tree stmt, list; | |
7851 | bool stmt_expr; | |
7852 | ||
7853 | code = eh_only ? TRY_CATCH_EXPR : TRY_FINALLY_EXPR; | |
7854 | stmt = build_stmt (code, NULL, cleanup); | |
5a508662 | 7855 | add_stmt (stmt); |
3a5b9284 RH |
7856 | stmt_expr = STATEMENT_LIST_STMT_EXPR (cur_stmt_list); |
7857 | list = push_stmt_list (); | |
7858 | TREE_OPERAND (stmt, 0) = list; | |
7859 | STATEMENT_LIST_STMT_EXPR (list) = stmt_expr; | |
5a508662 | 7860 | } |
325c3691 | 7861 | \f |
3e4093b6 RS |
7862 | /* Build a binary-operation expression without default conversions. |
7863 | CODE is the kind of expression to build. | |
7864 | This function differs from `build' in several ways: | |
7865 | the data type of the result is computed and recorded in it, | |
7866 | warnings are generated if arg data types are invalid, | |
7867 | special handling for addition and subtraction of pointers is known, | |
7868 | and some optimization is done (operations on narrow ints | |
7869 | are done in the narrower type when that gives the same result). | |
7870 | Constant folding is also done before the result is returned. | |
de520661 | 7871 | |
3e4093b6 RS |
7872 | Note that the operands will never have enumeral types, or function |
7873 | or array types, because either they will have the default conversions | |
7874 | performed or they have both just been converted to some other type in which | |
7875 | the arithmetic is to be done. */ | |
7876 | ||
7877 | tree | |
7878 | build_binary_op (enum tree_code code, tree orig_op0, tree orig_op1, | |
7879 | int convert_p) | |
de520661 | 7880 | { |
3e4093b6 RS |
7881 | tree type0, type1; |
7882 | enum tree_code code0, code1; | |
7883 | tree op0, op1; | |
4de67c26 | 7884 | const char *invalid_op_diag; |
b62acd60 | 7885 | |
3e4093b6 RS |
7886 | /* Expression code to give to the expression when it is built. |
7887 | Normally this is CODE, which is what the caller asked for, | |
7888 | but in some special cases we change it. */ | |
7889 | enum tree_code resultcode = code; | |
8b6a5902 | 7890 | |
3e4093b6 RS |
7891 | /* Data type in which the computation is to be performed. |
7892 | In the simplest cases this is the common type of the arguments. */ | |
7893 | tree result_type = NULL; | |
7894 | ||
7895 | /* Nonzero means operands have already been type-converted | |
7896 | in whatever way is necessary. | |
7897 | Zero means they need to be converted to RESULT_TYPE. */ | |
7898 | int converted = 0; | |
7899 | ||
7900 | /* Nonzero means create the expression with this type, rather than | |
7901 | RESULT_TYPE. */ | |
7902 | tree build_type = 0; | |
7903 | ||
7904 | /* Nonzero means after finally constructing the expression | |
7905 | convert it to this type. */ | |
7906 | tree final_type = 0; | |
7907 | ||
7908 | /* Nonzero if this is an operation like MIN or MAX which can | |
7909 | safely be computed in short if both args are promoted shorts. | |
7910 | Also implies COMMON. | |
7911 | -1 indicates a bitwise operation; this makes a difference | |
7912 | in the exact conditions for when it is safe to do the operation | |
7913 | in a narrower mode. */ | |
7914 | int shorten = 0; | |
7915 | ||
7916 | /* Nonzero if this is a comparison operation; | |
7917 | if both args are promoted shorts, compare the original shorts. | |
7918 | Also implies COMMON. */ | |
7919 | int short_compare = 0; | |
7920 | ||
7921 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
7922 | original short and then promoted if the operand is a promoted short. */ | |
7923 | int short_shift = 0; | |
7924 | ||
7925 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
7926 | int common = 0; | |
7927 | ||
58393038 ZL |
7928 | /* True means types are compatible as far as ObjC is concerned. */ |
7929 | bool objc_ok; | |
7930 | ||
3e4093b6 | 7931 | if (convert_p) |
790e9490 | 7932 | { |
3e4093b6 RS |
7933 | op0 = default_conversion (orig_op0); |
7934 | op1 = default_conversion (orig_op1); | |
790e9490 | 7935 | } |
3e4093b6 | 7936 | else |
790e9490 | 7937 | { |
3e4093b6 RS |
7938 | op0 = orig_op0; |
7939 | op1 = orig_op1; | |
790e9490 RS |
7940 | } |
7941 | ||
3e4093b6 RS |
7942 | type0 = TREE_TYPE (op0); |
7943 | type1 = TREE_TYPE (op1); | |
91fa3c30 | 7944 | |
3e4093b6 RS |
7945 | /* The expression codes of the data types of the arguments tell us |
7946 | whether the arguments are integers, floating, pointers, etc. */ | |
7947 | code0 = TREE_CODE (type0); | |
7948 | code1 = TREE_CODE (type1); | |
7949 | ||
7950 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ | |
7951 | STRIP_TYPE_NOPS (op0); | |
7952 | STRIP_TYPE_NOPS (op1); | |
7953 | ||
7954 | /* If an error was already reported for one of the arguments, | |
7955 | avoid reporting another error. */ | |
7956 | ||
7957 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
7958 | return error_mark_node; | |
7959 | ||
4de67c26 JM |
7960 | if ((invalid_op_diag |
7961 | = targetm.invalid_binary_op (code, type0, type1))) | |
7962 | { | |
7963 | error (invalid_op_diag); | |
7964 | return error_mark_node; | |
7965 | } | |
7966 | ||
58393038 ZL |
7967 | objc_ok = objc_compare_types (type0, type1, -3, NULL_TREE); |
7968 | ||
3e4093b6 | 7969 | switch (code) |
de520661 | 7970 | { |
3e4093b6 RS |
7971 | case PLUS_EXPR: |
7972 | /* Handle the pointer + int case. */ | |
7973 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
7974 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
7975 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
7976 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
fe67cf58 | 7977 | else |
3e4093b6 RS |
7978 | common = 1; |
7979 | break; | |
400fbf9f | 7980 | |
3e4093b6 RS |
7981 | case MINUS_EXPR: |
7982 | /* Subtraction of two similar pointers. | |
7983 | We must subtract them as integers, then divide by object size. */ | |
7984 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
58393038 | 7985 | && comp_target_types (type0, type1)) |
3e4093b6 RS |
7986 | return pointer_diff (op0, op1); |
7987 | /* Handle pointer minus int. Just like pointer plus int. */ | |
7988 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
7989 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
7990 | else | |
7991 | common = 1; | |
7992 | break; | |
8b6a5902 | 7993 | |
3e4093b6 RS |
7994 | case MULT_EXPR: |
7995 | common = 1; | |
7996 | break; | |
7997 | ||
7998 | case TRUNC_DIV_EXPR: | |
7999 | case CEIL_DIV_EXPR: | |
8000 | case FLOOR_DIV_EXPR: | |
8001 | case ROUND_DIV_EXPR: | |
8002 | case EXACT_DIV_EXPR: | |
2e9cb75e | 8003 | warn_for_div_by_zero (op1); |
3e4093b6 RS |
8004 | |
8005 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE | |
ab22c1fa | 8006 | || code0 == FIXED_POINT_TYPE |
3e4093b6 RS |
8007 | || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) |
8008 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
ab22c1fa | 8009 | || code1 == FIXED_POINT_TYPE |
3e4093b6 | 8010 | || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)) |
400fbf9f | 8011 | { |
5bed876a AH |
8012 | enum tree_code tcode0 = code0, tcode1 = code1; |
8013 | ||
3a021db2 | 8014 | if (code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) |
5bed876a | 8015 | tcode0 = TREE_CODE (TREE_TYPE (TREE_TYPE (op0))); |
3a021db2 | 8016 | if (code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE) |
5bed876a | 8017 | tcode1 = TREE_CODE (TREE_TYPE (TREE_TYPE (op1))); |
3a021db2 | 8018 | |
ab22c1fa CF |
8019 | if (!((tcode0 == INTEGER_TYPE && tcode1 == INTEGER_TYPE) |
8020 | || (tcode0 == FIXED_POINT_TYPE && tcode1 == FIXED_POINT_TYPE))) | |
3e4093b6 RS |
8021 | resultcode = RDIV_EXPR; |
8022 | else | |
8023 | /* Although it would be tempting to shorten always here, that | |
8024 | loses on some targets, since the modulo instruction is | |
8025 | undefined if the quotient can't be represented in the | |
8026 | computation mode. We shorten only if unsigned or if | |
8027 | dividing by something we know != -1. */ | |
8df83eae | 8028 | shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0)) |
3e4093b6 | 8029 | || (TREE_CODE (op1) == INTEGER_CST |
3f75a254 | 8030 | && !integer_all_onesp (op1))); |
3e4093b6 RS |
8031 | common = 1; |
8032 | } | |
8033 | break; | |
de520661 | 8034 | |
3e4093b6 | 8035 | case BIT_AND_EXPR: |
3e4093b6 RS |
8036 | case BIT_IOR_EXPR: |
8037 | case BIT_XOR_EXPR: | |
8038 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
8039 | shorten = -1; | |
9ef0c8d9 AP |
8040 | /* Allow vector types which are not floating point types. */ |
8041 | else if (code0 == VECTOR_TYPE | |
8042 | && code1 == VECTOR_TYPE | |
8043 | && !VECTOR_FLOAT_TYPE_P (type0) | |
8044 | && !VECTOR_FLOAT_TYPE_P (type1)) | |
3e4093b6 RS |
8045 | common = 1; |
8046 | break; | |
8047 | ||
8048 | case TRUNC_MOD_EXPR: | |
8049 | case FLOOR_MOD_EXPR: | |
2e9cb75e | 8050 | warn_for_div_by_zero (op1); |
de520661 | 8051 | |
3e4093b6 RS |
8052 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
8053 | { | |
8054 | /* Although it would be tempting to shorten always here, that loses | |
8055 | on some targets, since the modulo instruction is undefined if the | |
8056 | quotient can't be represented in the computation mode. We shorten | |
8057 | only if unsigned or if dividing by something we know != -1. */ | |
8df83eae | 8058 | shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0)) |
3e4093b6 | 8059 | || (TREE_CODE (op1) == INTEGER_CST |
3f75a254 | 8060 | && !integer_all_onesp (op1))); |
3e4093b6 RS |
8061 | common = 1; |
8062 | } | |
8063 | break; | |
de520661 | 8064 | |
3e4093b6 RS |
8065 | case TRUTH_ANDIF_EXPR: |
8066 | case TRUTH_ORIF_EXPR: | |
8067 | case TRUTH_AND_EXPR: | |
8068 | case TRUTH_OR_EXPR: | |
8069 | case TRUTH_XOR_EXPR: | |
8070 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE | |
ab22c1fa CF |
8071 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE |
8072 | || code0 == FIXED_POINT_TYPE) | |
3e4093b6 | 8073 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE |
ab22c1fa CF |
8074 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE |
8075 | || code1 == FIXED_POINT_TYPE)) | |
3e4093b6 RS |
8076 | { |
8077 | /* Result of these operations is always an int, | |
8078 | but that does not mean the operands should be | |
8079 | converted to ints! */ | |
8080 | result_type = integer_type_node; | |
85498824 JM |
8081 | op0 = c_common_truthvalue_conversion (op0); |
8082 | op1 = c_common_truthvalue_conversion (op1); | |
3e4093b6 RS |
8083 | converted = 1; |
8084 | } | |
8085 | break; | |
eba80994 | 8086 | |
3e4093b6 RS |
8087 | /* Shift operations: result has same type as first operand; |
8088 | always convert second operand to int. | |
8089 | Also set SHORT_SHIFT if shifting rightward. */ | |
de520661 | 8090 | |
3e4093b6 | 8091 | case RSHIFT_EXPR: |
ab22c1fa CF |
8092 | if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE) |
8093 | && code1 == INTEGER_TYPE) | |
3e4093b6 RS |
8094 | { |
8095 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) | |
b62acd60 | 8096 | { |
3e4093b6 | 8097 | if (tree_int_cst_sgn (op1) < 0) |
d4ee4d25 | 8098 | warning (0, "right shift count is negative"); |
3e4093b6 | 8099 | else |
bbb818c6 | 8100 | { |
3f75a254 | 8101 | if (!integer_zerop (op1)) |
3e4093b6 RS |
8102 | short_shift = 1; |
8103 | ||
8104 | if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) | |
d4ee4d25 | 8105 | warning (0, "right shift count >= width of type"); |
bbb818c6 | 8106 | } |
b62acd60 | 8107 | } |
de520661 | 8108 | |
3e4093b6 RS |
8109 | /* Use the type of the value to be shifted. */ |
8110 | result_type = type0; | |
8111 | /* Convert the shift-count to an integer, regardless of size | |
8112 | of value being shifted. */ | |
8113 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
8114 | op1 = convert (integer_type_node, op1); | |
8115 | /* Avoid converting op1 to result_type later. */ | |
8116 | converted = 1; | |
400fbf9f | 8117 | } |
3e4093b6 | 8118 | break; |
253b6b82 | 8119 | |
3e4093b6 | 8120 | case LSHIFT_EXPR: |
ab22c1fa CF |
8121 | if ((code0 == INTEGER_TYPE || code0 == FIXED_POINT_TYPE) |
8122 | && code1 == INTEGER_TYPE) | |
3e4093b6 RS |
8123 | { |
8124 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) | |
de520661 | 8125 | { |
3e4093b6 | 8126 | if (tree_int_cst_sgn (op1) < 0) |
d4ee4d25 | 8127 | warning (0, "left shift count is negative"); |
de520661 | 8128 | |
3e4093b6 | 8129 | else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) |
d4ee4d25 | 8130 | warning (0, "left shift count >= width of type"); |
94ba5069 | 8131 | } |
de520661 | 8132 | |
3e4093b6 RS |
8133 | /* Use the type of the value to be shifted. */ |
8134 | result_type = type0; | |
8135 | /* Convert the shift-count to an integer, regardless of size | |
8136 | of value being shifted. */ | |
8137 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
8138 | op1 = convert (integer_type_node, op1); | |
8139 | /* Avoid converting op1 to result_type later. */ | |
8140 | converted = 1; | |
400fbf9f | 8141 | } |
3e4093b6 | 8142 | break; |
de520661 | 8143 | |
3e4093b6 RS |
8144 | case EQ_EXPR: |
8145 | case NE_EXPR: | |
ae311566 | 8146 | if (FLOAT_TYPE_P (type0) || FLOAT_TYPE_P (type1)) |
44c21c7f DD |
8147 | warning (OPT_Wfloat_equal, |
8148 | "comparing floating point with == or != is unsafe"); | |
3e4093b6 RS |
8149 | /* Result of comparison is always int, |
8150 | but don't convert the args to int! */ | |
8151 | build_type = integer_type_node; | |
8152 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE | |
ab22c1fa | 8153 | || code0 == FIXED_POINT_TYPE || code0 == COMPLEX_TYPE) |
3e4093b6 | 8154 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
ab22c1fa | 8155 | || code1 == FIXED_POINT_TYPE || code1 == COMPLEX_TYPE)) |
3e4093b6 RS |
8156 | short_compare = 1; |
8157 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
8158 | { | |
8159 | tree tt0 = TREE_TYPE (type0); | |
8160 | tree tt1 = TREE_TYPE (type1); | |
8161 | /* Anything compares with void *. void * compares with anything. | |
8162 | Otherwise, the targets must be compatible | |
8163 | and both must be object or both incomplete. */ | |
58393038 | 8164 | if (comp_target_types (type0, type1)) |
10bc1b1b | 8165 | result_type = common_pointer_type (type0, type1); |
3e4093b6 | 8166 | else if (VOID_TYPE_P (tt0)) |
ee2990e7 | 8167 | { |
3e4093b6 RS |
8168 | /* op0 != orig_op0 detects the case of something |
8169 | whose value is 0 but which isn't a valid null ptr const. */ | |
6aa3c60d | 8170 | if (pedantic && !null_pointer_constant_p (orig_op0) |
3e4093b6 | 8171 | && TREE_CODE (tt1) == FUNCTION_TYPE) |
bda67431 JM |
8172 | pedwarn ("ISO C forbids comparison of %<void *%>" |
8173 | " with function pointer"); | |
ee2990e7 | 8174 | } |
3e4093b6 | 8175 | else if (VOID_TYPE_P (tt1)) |
e6834654 | 8176 | { |
6aa3c60d | 8177 | if (pedantic && !null_pointer_constant_p (orig_op1) |
3e4093b6 | 8178 | && TREE_CODE (tt0) == FUNCTION_TYPE) |
bda67431 JM |
8179 | pedwarn ("ISO C forbids comparison of %<void *%>" |
8180 | " with function pointer"); | |
e6834654 | 8181 | } |
3e4093b6 | 8182 | else |
58393038 ZL |
8183 | /* Avoid warning about the volatile ObjC EH puts on decls. */ |
8184 | if (!objc_ok) | |
8185 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
e6834654 | 8186 | |
3e4093b6 RS |
8187 | if (result_type == NULL_TREE) |
8188 | result_type = ptr_type_node; | |
e6834654 | 8189 | } |
6aa3c60d | 8190 | else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1)) |
690a704a BE |
8191 | { |
8192 | if (TREE_CODE (op0) == ADDR_EXPR | |
b3c6d2ea | 8193 | && decl_with_nonnull_addr_p (TREE_OPERAND (op0, 0))) |
c116cd05 | 8194 | warning (OPT_Waddress, "the address of %qD will never be NULL", |
690a704a BE |
8195 | TREE_OPERAND (op0, 0)); |
8196 | result_type = type0; | |
8197 | } | |
6aa3c60d | 8198 | else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0)) |
690a704a | 8199 | { |
c22cacf3 | 8200 | if (TREE_CODE (op1) == ADDR_EXPR |
b3c6d2ea | 8201 | && decl_with_nonnull_addr_p (TREE_OPERAND (op1, 0))) |
c116cd05 | 8202 | warning (OPT_Waddress, "the address of %qD will never be NULL", |
690a704a BE |
8203 | TREE_OPERAND (op1, 0)); |
8204 | result_type = type1; | |
8205 | } | |
3e4093b6 | 8206 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
de520661 | 8207 | { |
3e4093b6 RS |
8208 | result_type = type0; |
8209 | pedwarn ("comparison between pointer and integer"); | |
de520661 | 8210 | } |
3e4093b6 | 8211 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) |
8b6a5902 | 8212 | { |
3e4093b6 RS |
8213 | result_type = type1; |
8214 | pedwarn ("comparison between pointer and integer"); | |
8b6a5902 | 8215 | } |
3e4093b6 | 8216 | break; |
8b6a5902 | 8217 | |
3e4093b6 RS |
8218 | case LE_EXPR: |
8219 | case GE_EXPR: | |
8220 | case LT_EXPR: | |
8221 | case GT_EXPR: | |
8222 | build_type = integer_type_node; | |
ab22c1fa CF |
8223 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
8224 | || code0 == FIXED_POINT_TYPE) | |
8225 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
8226 | || code1 == FIXED_POINT_TYPE)) | |
3e4093b6 RS |
8227 | short_compare = 1; |
8228 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
8229 | { | |
58393038 | 8230 | if (comp_target_types (type0, type1)) |
3e4093b6 | 8231 | { |
10bc1b1b | 8232 | result_type = common_pointer_type (type0, type1); |
3e4093b6 RS |
8233 | if (!COMPLETE_TYPE_P (TREE_TYPE (type0)) |
8234 | != !COMPLETE_TYPE_P (TREE_TYPE (type1))) | |
8235 | pedwarn ("comparison of complete and incomplete pointers"); | |
8236 | else if (pedantic | |
8237 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
8238 | pedwarn ("ISO C forbids ordered comparisons of pointers to functions"); | |
8239 | } | |
8240 | else | |
8241 | { | |
8242 | result_type = ptr_type_node; | |
8243 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
8244 | } | |
8245 | } | |
6aa3c60d | 8246 | else if (code0 == POINTER_TYPE && null_pointer_constant_p (orig_op1)) |
3e4093b6 RS |
8247 | { |
8248 | result_type = type0; | |
8249 | if (pedantic || extra_warnings) | |
8250 | pedwarn ("ordered comparison of pointer with integer zero"); | |
8251 | } | |
6aa3c60d | 8252 | else if (code1 == POINTER_TYPE && null_pointer_constant_p (orig_op0)) |
3e4093b6 RS |
8253 | { |
8254 | result_type = type1; | |
8255 | if (pedantic) | |
8256 | pedwarn ("ordered comparison of pointer with integer zero"); | |
8257 | } | |
8258 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
8259 | { | |
8260 | result_type = type0; | |
8261 | pedwarn ("comparison between pointer and integer"); | |
8262 | } | |
8263 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
8264 | { | |
8265 | result_type = type1; | |
8266 | pedwarn ("comparison between pointer and integer"); | |
8267 | } | |
8268 | break; | |
64094f6a | 8269 | |
3e4093b6 | 8270 | default: |
37b2f290 | 8271 | gcc_unreachable (); |
c9fe6f9f | 8272 | } |
8f17b5c5 | 8273 | |
e57e265b PB |
8274 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) |
8275 | return error_mark_node; | |
8276 | ||
5bed876a AH |
8277 | if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE |
8278 | && (!tree_int_cst_equal (TYPE_SIZE (type0), TYPE_SIZE (type1)) | |
8279 | || !same_scalar_type_ignoring_signedness (TREE_TYPE (type0), | |
8280 | TREE_TYPE (type1)))) | |
8281 | { | |
2c751309 | 8282 | binary_op_error (code, type0, type1); |
5bed876a AH |
8283 | return error_mark_node; |
8284 | } | |
8285 | ||
3e4093b6 | 8286 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE |
ab22c1fa | 8287 | || code0 == FIXED_POINT_TYPE || code0 == VECTOR_TYPE) |
3e4093b6 RS |
8288 | && |
8289 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE | |
ab22c1fa | 8290 | || code1 == FIXED_POINT_TYPE || code1 == VECTOR_TYPE)) |
400fbf9f | 8291 | { |
3e4093b6 | 8292 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
39b726dd | 8293 | |
3e4093b6 | 8294 | if (shorten || common || short_compare) |
3bf6bfcc JJ |
8295 | { |
8296 | result_type = c_common_type (type0, type1); | |
8297 | if (result_type == error_mark_node) | |
8298 | return error_mark_node; | |
8299 | } | |
400fbf9f | 8300 | |
3e4093b6 RS |
8301 | /* For certain operations (which identify themselves by shorten != 0) |
8302 | if both args were extended from the same smaller type, | |
8303 | do the arithmetic in that type and then extend. | |
400fbf9f | 8304 | |
3e4093b6 RS |
8305 | shorten !=0 and !=1 indicates a bitwise operation. |
8306 | For them, this optimization is safe only if | |
8307 | both args are zero-extended or both are sign-extended. | |
8308 | Otherwise, we might change the result. | |
8309 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
8310 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
400fbf9f | 8311 | |
3e4093b6 RS |
8312 | if (shorten && none_complex) |
8313 | { | |
8314 | int unsigned0, unsigned1; | |
e6620e86 KH |
8315 | tree arg0, arg1; |
8316 | int uns; | |
3e4093b6 | 8317 | tree type; |
400fbf9f | 8318 | |
e6620e86 KH |
8319 | /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents |
8320 | excessive narrowing when we call get_narrower below. For | |
8321 | example, suppose that OP0 is of unsigned int extended | |
8322 | from signed char and that RESULT_TYPE is long long int. | |
8323 | If we explicitly cast OP0 to RESULT_TYPE, OP0 would look | |
8324 | like | |
8325 | ||
8326 | (long long int) (unsigned int) signed_char | |
8327 | ||
8328 | which get_narrower would narrow down to | |
8329 | ||
8330 | (unsigned int) signed char | |
8331 | ||
8332 | If we do not cast OP0 first, get_narrower would return | |
8333 | signed_char, which is inconsistent with the case of the | |
8334 | explicit cast. */ | |
8335 | op0 = convert (result_type, op0); | |
8336 | op1 = convert (result_type, op1); | |
8337 | ||
8338 | arg0 = get_narrower (op0, &unsigned0); | |
8339 | arg1 = get_narrower (op1, &unsigned1); | |
8340 | ||
8341 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
8342 | uns = TYPE_UNSIGNED (result_type); | |
8343 | ||
3e4093b6 | 8344 | final_type = result_type; |
70768eda | 8345 | |
3e4093b6 RS |
8346 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
8347 | but it *requires* conversion to FINAL_TYPE. */ | |
70768eda | 8348 | |
3e4093b6 RS |
8349 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
8350 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
8351 | && TREE_TYPE (op0) != final_type) | |
8df83eae | 8352 | unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
3e4093b6 RS |
8353 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
8354 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
8355 | && TREE_TYPE (op1) != final_type) | |
8df83eae | 8356 | unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
88a3dbc1 | 8357 | |
3e4093b6 | 8358 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ |
abe80e6d | 8359 | |
3e4093b6 RS |
8360 | /* For bitwise operations, signedness of nominal type |
8361 | does not matter. Consider only how operands were extended. */ | |
8362 | if (shorten == -1) | |
8363 | uns = unsigned0; | |
abe80e6d | 8364 | |
3e4093b6 RS |
8365 | /* Note that in all three cases below we refrain from optimizing |
8366 | an unsigned operation on sign-extended args. | |
8367 | That would not be valid. */ | |
abe80e6d | 8368 | |
3e4093b6 RS |
8369 | /* Both args variable: if both extended in same way |
8370 | from same width, do it in that width. | |
8371 | Do it unsigned if args were zero-extended. */ | |
8372 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
8373 | < TYPE_PRECISION (result_type)) | |
8374 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
8375 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
8376 | && unsigned0 == unsigned1 | |
8377 | && (unsigned0 || !uns)) | |
8378 | result_type | |
8379 | = c_common_signed_or_unsigned_type | |
5922c215 | 8380 | (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); |
3e4093b6 RS |
8381 | else if (TREE_CODE (arg0) == INTEGER_CST |
8382 | && (unsigned1 || !uns) | |
8383 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
8384 | < TYPE_PRECISION (result_type)) | |
8385 | && (type | |
8386 | = c_common_signed_or_unsigned_type (unsigned1, | |
eafaa675 AP |
8387 | TREE_TYPE (arg1))) |
8388 | && !POINTER_TYPE_P (type) | |
8389 | && int_fits_type_p (arg0, type)) | |
3e4093b6 RS |
8390 | result_type = type; |
8391 | else if (TREE_CODE (arg1) == INTEGER_CST | |
8392 | && (unsigned0 || !uns) | |
8393 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
8394 | < TYPE_PRECISION (result_type)) | |
8395 | && (type | |
8396 | = c_common_signed_or_unsigned_type (unsigned0, | |
eafaa675 AP |
8397 | TREE_TYPE (arg0))) |
8398 | && !POINTER_TYPE_P (type) | |
8399 | && int_fits_type_p (arg1, type)) | |
3e4093b6 RS |
8400 | result_type = type; |
8401 | } | |
88a3dbc1 | 8402 | |
3e4093b6 | 8403 | /* Shifts can be shortened if shifting right. */ |
2f6e4e97 | 8404 | |
3e4093b6 RS |
8405 | if (short_shift) |
8406 | { | |
8407 | int unsigned_arg; | |
8408 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
88a3dbc1 | 8409 | |
3e4093b6 | 8410 | final_type = result_type; |
abe80e6d | 8411 | |
3e4093b6 | 8412 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) |
8df83eae | 8413 | unsigned_arg = TYPE_UNSIGNED (TREE_TYPE (op0)); |
e9a25f70 | 8414 | |
3e4093b6 RS |
8415 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) |
8416 | /* We can shorten only if the shift count is less than the | |
8417 | number of bits in the smaller type size. */ | |
8418 | && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0 | |
8419 | /* We cannot drop an unsigned shift after sign-extension. */ | |
8df83eae | 8420 | && (!TYPE_UNSIGNED (final_type) || unsigned_arg)) |
3e4093b6 RS |
8421 | { |
8422 | /* Do an unsigned shift if the operand was zero-extended. */ | |
8423 | result_type | |
8424 | = c_common_signed_or_unsigned_type (unsigned_arg, | |
8425 | TREE_TYPE (arg0)); | |
8426 | /* Convert value-to-be-shifted to that type. */ | |
8427 | if (TREE_TYPE (op0) != result_type) | |
8428 | op0 = convert (result_type, op0); | |
8429 | converted = 1; | |
abe80e6d | 8430 | } |
88a3dbc1 RK |
8431 | } |
8432 | ||
3e4093b6 RS |
8433 | /* Comparison operations are shortened too but differently. |
8434 | They identify themselves by setting short_compare = 1. */ | |
56cb9733 | 8435 | |
3e4093b6 RS |
8436 | if (short_compare) |
8437 | { | |
8438 | /* Don't write &op0, etc., because that would prevent op0 | |
8439 | from being kept in a register. | |
8440 | Instead, make copies of the our local variables and | |
8441 | pass the copies by reference, then copy them back afterward. */ | |
8442 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
8443 | enum tree_code xresultcode = resultcode; | |
8444 | tree val | |
8445 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
8f17b5c5 | 8446 | |
3e4093b6 RS |
8447 | if (val != 0) |
8448 | return val; | |
8f17b5c5 | 8449 | |
3e4093b6 RS |
8450 | op0 = xop0, op1 = xop1; |
8451 | converted = 1; | |
8452 | resultcode = xresultcode; | |
8f17b5c5 | 8453 | |
3e4093b6 RS |
8454 | if (warn_sign_compare && skip_evaluation == 0) |
8455 | { | |
3f75a254 JM |
8456 | int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0)); |
8457 | int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3e4093b6 RS |
8458 | int unsignedp0, unsignedp1; |
8459 | tree primop0 = get_narrower (op0, &unsignedp0); | |
8460 | tree primop1 = get_narrower (op1, &unsignedp1); | |
400fbf9f | 8461 | |
3e4093b6 RS |
8462 | xop0 = orig_op0; |
8463 | xop1 = orig_op1; | |
8464 | STRIP_TYPE_NOPS (xop0); | |
8465 | STRIP_TYPE_NOPS (xop1); | |
e89a9554 | 8466 | |
3e4093b6 RS |
8467 | /* Give warnings for comparisons between signed and unsigned |
8468 | quantities that may fail. | |
e89a9554 | 8469 | |
3e4093b6 RS |
8470 | Do the checking based on the original operand trees, so that |
8471 | casts will be considered, but default promotions won't be. | |
400fbf9f | 8472 | |
3e4093b6 RS |
8473 | Do not warn if the comparison is being done in a signed type, |
8474 | since the signed type will only be chosen if it can represent | |
8475 | all the values of the unsigned type. */ | |
3f75a254 | 8476 | if (!TYPE_UNSIGNED (result_type)) |
3e4093b6 | 8477 | /* OK */; |
c22cacf3 MS |
8478 | /* Do not warn if both operands are the same signedness. */ |
8479 | else if (op0_signed == op1_signed) | |
8480 | /* OK */; | |
3e4093b6 RS |
8481 | else |
8482 | { | |
8483 | tree sop, uop; | |
6ac01510 | 8484 | bool ovf; |
8f17b5c5 | 8485 | |
3e4093b6 RS |
8486 | if (op0_signed) |
8487 | sop = xop0, uop = xop1; | |
8488 | else | |
8489 | sop = xop1, uop = xop0; | |
8f17b5c5 | 8490 | |
3e4093b6 RS |
8491 | /* Do not warn if the signed quantity is an |
8492 | unsuffixed integer literal (or some static | |
8493 | constant expression involving such literals or a | |
8494 | conditional expression involving such literals) | |
8495 | and it is non-negative. */ | |
6ac01510 | 8496 | if (tree_expr_nonnegative_warnv_p (sop, &ovf)) |
3e4093b6 RS |
8497 | /* OK */; |
8498 | /* Do not warn if the comparison is an equality operation, | |
8499 | the unsigned quantity is an integral constant, and it | |
8500 | would fit in the result if the result were signed. */ | |
8501 | else if (TREE_CODE (uop) == INTEGER_CST | |
8502 | && (resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
8503 | && int_fits_type_p | |
8504 | (uop, c_common_signed_type (result_type))) | |
8505 | /* OK */; | |
8506 | /* Do not warn if the unsigned quantity is an enumeration | |
8507 | constant and its maximum value would fit in the result | |
8508 | if the result were signed. */ | |
8509 | else if (TREE_CODE (uop) == INTEGER_CST | |
8510 | && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE | |
8511 | && int_fits_type_p | |
3f75a254 | 8512 | (TYPE_MAX_VALUE (TREE_TYPE (uop)), |
3e4093b6 RS |
8513 | c_common_signed_type (result_type))) |
8514 | /* OK */; | |
8515 | else | |
c5409249 | 8516 | warning (OPT_Wsign_compare, "comparison between signed and unsigned"); |
3e4093b6 | 8517 | } |
8f17b5c5 | 8518 | |
3e4093b6 RS |
8519 | /* Warn if two unsigned values are being compared in a size |
8520 | larger than their original size, and one (and only one) is the | |
8521 | result of a `~' operator. This comparison will always fail. | |
8f17b5c5 | 8522 | |
3e4093b6 RS |
8523 | Also warn if one operand is a constant, and the constant |
8524 | does not have all bits set that are set in the ~ operand | |
8525 | when it is extended. */ | |
8f17b5c5 | 8526 | |
3e4093b6 RS |
8527 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) |
8528 | != (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
8529 | { | |
8530 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
8531 | primop0 = get_narrower (TREE_OPERAND (primop0, 0), | |
8532 | &unsignedp0); | |
8533 | else | |
8534 | primop1 = get_narrower (TREE_OPERAND (primop1, 0), | |
8535 | &unsignedp1); | |
64094f6a | 8536 | |
3e4093b6 RS |
8537 | if (host_integerp (primop0, 0) || host_integerp (primop1, 0)) |
8538 | { | |
8539 | tree primop; | |
8540 | HOST_WIDE_INT constant, mask; | |
8541 | int unsignedp, bits; | |
2ad1815d | 8542 | |
3e4093b6 RS |
8543 | if (host_integerp (primop0, 0)) |
8544 | { | |
8545 | primop = primop1; | |
8546 | unsignedp = unsignedp1; | |
8547 | constant = tree_low_cst (primop0, 0); | |
8548 | } | |
8549 | else | |
8550 | { | |
8551 | primop = primop0; | |
8552 | unsignedp = unsignedp0; | |
8553 | constant = tree_low_cst (primop1, 0); | |
8554 | } | |
8555 | ||
8556 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
8557 | if (bits < TYPE_PRECISION (result_type) | |
8558 | && bits < HOST_BITS_PER_WIDE_INT && unsignedp) | |
8559 | { | |
3f75a254 | 8560 | mask = (~(HOST_WIDE_INT) 0) << bits; |
3e4093b6 | 8561 | if ((mask & constant) != mask) |
c5409249 | 8562 | warning (OPT_Wsign_compare, "comparison of promoted ~unsigned with constant"); |
3e4093b6 RS |
8563 | } |
8564 | } | |
8565 | else if (unsignedp0 && unsignedp1 | |
8566 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
8567 | < TYPE_PRECISION (result_type)) | |
8568 | && (TYPE_PRECISION (TREE_TYPE (primop1)) | |
8569 | < TYPE_PRECISION (result_type))) | |
c5409249 | 8570 | warning (OPT_Wsign_compare, "comparison of promoted ~unsigned with unsigned"); |
3e4093b6 RS |
8571 | } |
8572 | } | |
2ad1815d | 8573 | } |
64094f6a | 8574 | } |
64094f6a | 8575 | |
3e4093b6 RS |
8576 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. |
8577 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
8578 | Then the expression will be built. | |
8579 | It will be given type FINAL_TYPE if that is nonzero; | |
8580 | otherwise, it will be given type RESULT_TYPE. */ | |
400fbf9f | 8581 | |
3e4093b6 RS |
8582 | if (!result_type) |
8583 | { | |
2c751309 | 8584 | binary_op_error (code, TREE_TYPE (op0), TREE_TYPE (op1)); |
3e4093b6 RS |
8585 | return error_mark_node; |
8586 | } | |
400fbf9f | 8587 | |
3f75a254 | 8588 | if (!converted) |
3e4093b6 RS |
8589 | { |
8590 | if (TREE_TYPE (op0) != result_type) | |
0f57299d | 8591 | op0 = convert_and_check (result_type, op0); |
3e4093b6 | 8592 | if (TREE_TYPE (op1) != result_type) |
0f57299d | 8593 | op1 = convert_and_check (result_type, op1); |
d97c6333 JW |
8594 | |
8595 | /* This can happen if one operand has a vector type, and the other | |
8596 | has a different type. */ | |
8597 | if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK) | |
8598 | return error_mark_node; | |
3e4093b6 | 8599 | } |
400fbf9f | 8600 | |
3e4093b6 RS |
8601 | if (build_type == NULL_TREE) |
8602 | build_type = result_type; | |
400fbf9f | 8603 | |
3e4093b6 | 8604 | { |
3e4093b6 | 8605 | /* Treat expressions in initializers specially as they can't trap. */ |
00d1b1d6 JM |
8606 | tree result = require_constant_value ? fold_build2_initializer (resultcode, |
8607 | build_type, | |
8608 | op0, op1) | |
8609 | : fold_build2 (resultcode, build_type, | |
8610 | op0, op1); | |
6de9cd9a | 8611 | |
3e4093b6 | 8612 | if (final_type != 0) |
6de9cd9a DN |
8613 | result = convert (final_type, result); |
8614 | return result; | |
3e4093b6 | 8615 | } |
400fbf9f | 8616 | } |
85498824 JM |
8617 | |
8618 | ||
8619 | /* Convert EXPR to be a truth-value, validating its type for this | |
46bdb9cf | 8620 | purpose. */ |
85498824 JM |
8621 | |
8622 | tree | |
8623 | c_objc_common_truthvalue_conversion (tree expr) | |
8624 | { | |
85498824 JM |
8625 | switch (TREE_CODE (TREE_TYPE (expr))) |
8626 | { | |
8627 | case ARRAY_TYPE: | |
8628 | error ("used array that cannot be converted to pointer where scalar is required"); | |
8629 | return error_mark_node; | |
8630 | ||
8631 | case RECORD_TYPE: | |
8632 | error ("used struct type value where scalar is required"); | |
8633 | return error_mark_node; | |
8634 | ||
8635 | case UNION_TYPE: | |
8636 | error ("used union type value where scalar is required"); | |
8637 | return error_mark_node; | |
8638 | ||
46bdb9cf JM |
8639 | case FUNCTION_TYPE: |
8640 | gcc_unreachable (); | |
8641 | ||
85498824 JM |
8642 | default: |
8643 | break; | |
8644 | } | |
8645 | ||
8646 | /* ??? Should we also give an error for void and vectors rather than | |
8647 | leaving those to give errors later? */ | |
8648 | return c_common_truthvalue_conversion (expr); | |
8649 | } | |
73f397d4 JM |
8650 | \f |
8651 | ||
8652 | /* Convert EXPR to a contained DECL, updating *TC, *TI and *SE as | |
8653 | required. */ | |
8654 | ||
8655 | tree | |
51eed280 | 8656 | c_expr_to_decl (tree expr, bool *tc ATTRIBUTE_UNUSED, bool *se) |
73f397d4 JM |
8657 | { |
8658 | if (TREE_CODE (expr) == COMPOUND_LITERAL_EXPR) | |
8659 | { | |
8660 | tree decl = COMPOUND_LITERAL_EXPR_DECL (expr); | |
8661 | /* Executing a compound literal inside a function reinitializes | |
8662 | it. */ | |
8663 | if (!TREE_STATIC (decl)) | |
8664 | *se = true; | |
8665 | return decl; | |
8666 | } | |
8667 | else | |
8668 | return expr; | |
8669 | } | |
953ff289 | 8670 | \f |
c0220ea4 | 8671 | /* Like c_begin_compound_stmt, except force the retention of the BLOCK. */ |
953ff289 DN |
8672 | |
8673 | tree | |
8674 | c_begin_omp_parallel (void) | |
8675 | { | |
8676 | tree block; | |
8677 | ||
8678 | keep_next_level (); | |
8679 | block = c_begin_compound_stmt (true); | |
8680 | ||
8681 | return block; | |
8682 | } | |
8683 | ||
a68ab351 JJ |
8684 | /* Generate OMP_PARALLEL, with CLAUSES and BLOCK as its compound statement. */ |
8685 | ||
953ff289 DN |
8686 | tree |
8687 | c_finish_omp_parallel (tree clauses, tree block) | |
8688 | { | |
8689 | tree stmt; | |
8690 | ||
8691 | block = c_end_compound_stmt (block, true); | |
8692 | ||
8693 | stmt = make_node (OMP_PARALLEL); | |
8694 | TREE_TYPE (stmt) = void_type_node; | |
8695 | OMP_PARALLEL_CLAUSES (stmt) = clauses; | |
8696 | OMP_PARALLEL_BODY (stmt) = block; | |
8697 | ||
8698 | return add_stmt (stmt); | |
8699 | } | |
8700 | ||
a68ab351 JJ |
8701 | /* Like c_begin_compound_stmt, except force the retention of the BLOCK. */ |
8702 | ||
8703 | tree | |
8704 | c_begin_omp_task (void) | |
8705 | { | |
8706 | tree block; | |
8707 | ||
8708 | keep_next_level (); | |
8709 | block = c_begin_compound_stmt (true); | |
8710 | ||
8711 | return block; | |
8712 | } | |
8713 | ||
8714 | /* Generate OMP_TASK, with CLAUSES and BLOCK as its compound statement. */ | |
8715 | ||
8716 | tree | |
8717 | c_finish_omp_task (tree clauses, tree block) | |
8718 | { | |
8719 | tree stmt; | |
8720 | ||
8721 | block = c_end_compound_stmt (block, true); | |
8722 | ||
8723 | stmt = make_node (OMP_TASK); | |
8724 | TREE_TYPE (stmt) = void_type_node; | |
8725 | OMP_TASK_CLAUSES (stmt) = clauses; | |
8726 | OMP_TASK_BODY (stmt) = block; | |
8727 | ||
8728 | return add_stmt (stmt); | |
8729 | } | |
8730 | ||
953ff289 DN |
8731 | /* For all elements of CLAUSES, validate them vs OpenMP constraints. |
8732 | Remove any elements from the list that are invalid. */ | |
8733 | ||
8734 | tree | |
8735 | c_finish_omp_clauses (tree clauses) | |
8736 | { | |
8737 | bitmap_head generic_head, firstprivate_head, lastprivate_head; | |
8738 | tree c, t, *pc = &clauses; | |
8739 | const char *name; | |
8740 | ||
8741 | bitmap_obstack_initialize (NULL); | |
8742 | bitmap_initialize (&generic_head, &bitmap_default_obstack); | |
8743 | bitmap_initialize (&firstprivate_head, &bitmap_default_obstack); | |
8744 | bitmap_initialize (&lastprivate_head, &bitmap_default_obstack); | |
8745 | ||
8746 | for (pc = &clauses, c = clauses; c ; c = *pc) | |
8747 | { | |
8748 | bool remove = false; | |
8749 | bool need_complete = false; | |
8750 | bool need_implicitly_determined = false; | |
8751 | ||
aaf46ef9 | 8752 | switch (OMP_CLAUSE_CODE (c)) |
953ff289 DN |
8753 | { |
8754 | case OMP_CLAUSE_SHARED: | |
8755 | name = "shared"; | |
8756 | need_implicitly_determined = true; | |
8757 | goto check_dup_generic; | |
8758 | ||
8759 | case OMP_CLAUSE_PRIVATE: | |
8760 | name = "private"; | |
8761 | need_complete = true; | |
8762 | need_implicitly_determined = true; | |
8763 | goto check_dup_generic; | |
8764 | ||
8765 | case OMP_CLAUSE_REDUCTION: | |
8766 | name = "reduction"; | |
8767 | need_implicitly_determined = true; | |
8768 | t = OMP_CLAUSE_DECL (c); | |
8769 | if (AGGREGATE_TYPE_P (TREE_TYPE (t)) | |
8770 | || POINTER_TYPE_P (TREE_TYPE (t))) | |
8771 | { | |
8772 | error ("%qE has invalid type for %<reduction%>", t); | |
8773 | remove = true; | |
8774 | } | |
8775 | else if (FLOAT_TYPE_P (TREE_TYPE (t))) | |
8776 | { | |
8777 | enum tree_code r_code = OMP_CLAUSE_REDUCTION_CODE (c); | |
8778 | const char *r_name = NULL; | |
8779 | ||
8780 | switch (r_code) | |
8781 | { | |
8782 | case PLUS_EXPR: | |
8783 | case MULT_EXPR: | |
8784 | case MINUS_EXPR: | |
8785 | break; | |
8786 | case BIT_AND_EXPR: | |
8787 | r_name = "&"; | |
8788 | break; | |
8789 | case BIT_XOR_EXPR: | |
8790 | r_name = "^"; | |
8791 | break; | |
8792 | case BIT_IOR_EXPR: | |
8793 | r_name = "|"; | |
8794 | break; | |
8795 | case TRUTH_ANDIF_EXPR: | |
8796 | r_name = "&&"; | |
8797 | break; | |
8798 | case TRUTH_ORIF_EXPR: | |
8799 | r_name = "||"; | |
8800 | break; | |
8801 | default: | |
8802 | gcc_unreachable (); | |
8803 | } | |
8804 | if (r_name) | |
8805 | { | |
8806 | error ("%qE has invalid type for %<reduction(%s)%>", | |
8807 | t, r_name); | |
8808 | remove = true; | |
8809 | } | |
8810 | } | |
8811 | goto check_dup_generic; | |
8812 | ||
8813 | case OMP_CLAUSE_COPYPRIVATE: | |
8814 | name = "copyprivate"; | |
8815 | goto check_dup_generic; | |
8816 | ||
8817 | case OMP_CLAUSE_COPYIN: | |
8818 | name = "copyin"; | |
8819 | t = OMP_CLAUSE_DECL (c); | |
8820 | if (TREE_CODE (t) != VAR_DECL || !DECL_THREAD_LOCAL_P (t)) | |
8821 | { | |
8822 | error ("%qE must be %<threadprivate%> for %<copyin%>", t); | |
8823 | remove = true; | |
8824 | } | |
8825 | goto check_dup_generic; | |
8826 | ||
8827 | check_dup_generic: | |
8828 | t = OMP_CLAUSE_DECL (c); | |
8829 | if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL) | |
8830 | { | |
8831 | error ("%qE is not a variable in clause %qs", t, name); | |
8832 | remove = true; | |
8833 | } | |
8834 | else if (bitmap_bit_p (&generic_head, DECL_UID (t)) | |
8835 | || bitmap_bit_p (&firstprivate_head, DECL_UID (t)) | |
8836 | || bitmap_bit_p (&lastprivate_head, DECL_UID (t))) | |
8837 | { | |
8838 | error ("%qE appears more than once in data clauses", t); | |
8839 | remove = true; | |
8840 | } | |
8841 | else | |
8842 | bitmap_set_bit (&generic_head, DECL_UID (t)); | |
8843 | break; | |
8844 | ||
8845 | case OMP_CLAUSE_FIRSTPRIVATE: | |
8846 | name = "firstprivate"; | |
8847 | t = OMP_CLAUSE_DECL (c); | |
8848 | need_complete = true; | |
8849 | need_implicitly_determined = true; | |
8850 | if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL) | |
8851 | { | |
8852 | error ("%qE is not a variable in clause %<firstprivate%>", t); | |
8853 | remove = true; | |
8854 | } | |
8855 | else if (bitmap_bit_p (&generic_head, DECL_UID (t)) | |
8856 | || bitmap_bit_p (&firstprivate_head, DECL_UID (t))) | |
8857 | { | |
8858 | error ("%qE appears more than once in data clauses", t); | |
8859 | remove = true; | |
8860 | } | |
8861 | else | |
8862 | bitmap_set_bit (&firstprivate_head, DECL_UID (t)); | |
8863 | break; | |
8864 | ||
8865 | case OMP_CLAUSE_LASTPRIVATE: | |
8866 | name = "lastprivate"; | |
8867 | t = OMP_CLAUSE_DECL (c); | |
8868 | need_complete = true; | |
8869 | need_implicitly_determined = true; | |
8870 | if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL) | |
8871 | { | |
8872 | error ("%qE is not a variable in clause %<lastprivate%>", t); | |
8873 | remove = true; | |
8874 | } | |
8875 | else if (bitmap_bit_p (&generic_head, DECL_UID (t)) | |
8876 | || bitmap_bit_p (&lastprivate_head, DECL_UID (t))) | |
8877 | { | |
8878 | error ("%qE appears more than once in data clauses", t); | |
8879 | remove = true; | |
8880 | } | |
8881 | else | |
8882 | bitmap_set_bit (&lastprivate_head, DECL_UID (t)); | |
8883 | break; | |
8884 | ||
8885 | case OMP_CLAUSE_IF: | |
8886 | case OMP_CLAUSE_NUM_THREADS: | |
8887 | case OMP_CLAUSE_SCHEDULE: | |
8888 | case OMP_CLAUSE_NOWAIT: | |
8889 | case OMP_CLAUSE_ORDERED: | |
8890 | case OMP_CLAUSE_DEFAULT: | |
a68ab351 JJ |
8891 | case OMP_CLAUSE_UNTIED: |
8892 | case OMP_CLAUSE_COLLAPSE: | |
953ff289 DN |
8893 | pc = &OMP_CLAUSE_CHAIN (c); |
8894 | continue; | |
8895 | ||
8896 | default: | |
8897 | gcc_unreachable (); | |
8898 | } | |
8899 | ||
8900 | if (!remove) | |
8901 | { | |
8902 | t = OMP_CLAUSE_DECL (c); | |
8903 | ||
8904 | if (need_complete) | |
8905 | { | |
8906 | t = require_complete_type (t); | |
8907 | if (t == error_mark_node) | |
8908 | remove = true; | |
8909 | } | |
8910 | ||
8911 | if (need_implicitly_determined) | |
8912 | { | |
8913 | const char *share_name = NULL; | |
8914 | ||
8915 | if (TREE_CODE (t) == VAR_DECL && DECL_THREAD_LOCAL_P (t)) | |
8916 | share_name = "threadprivate"; | |
8917 | else switch (c_omp_predetermined_sharing (t)) | |
8918 | { | |
8919 | case OMP_CLAUSE_DEFAULT_UNSPECIFIED: | |
8920 | break; | |
8921 | case OMP_CLAUSE_DEFAULT_SHARED: | |
8922 | share_name = "shared"; | |
8923 | break; | |
8924 | case OMP_CLAUSE_DEFAULT_PRIVATE: | |
8925 | share_name = "private"; | |
8926 | break; | |
8927 | default: | |
8928 | gcc_unreachable (); | |
8929 | } | |
8930 | if (share_name) | |
8931 | { | |
8932 | error ("%qE is predetermined %qs for %qs", | |
8933 | t, share_name, name); | |
8934 | remove = true; | |
8935 | } | |
8936 | } | |
8937 | } | |
8938 | ||
8939 | if (remove) | |
8940 | *pc = OMP_CLAUSE_CHAIN (c); | |
8941 | else | |
8942 | pc = &OMP_CLAUSE_CHAIN (c); | |
8943 | } | |
8944 | ||
8945 | bitmap_obstack_release (NULL); | |
8946 | return clauses; | |
8947 | } | |
9ae165a0 DG |
8948 | |
8949 | /* Make a variant type in the proper way for C/C++, propagating qualifiers | |
8950 | down to the element type of an array. */ | |
8951 | ||
8952 | tree | |
8953 | c_build_qualified_type (tree type, int type_quals) | |
8954 | { | |
8955 | if (type == error_mark_node) | |
8956 | return type; | |
8957 | ||
8958 | if (TREE_CODE (type) == ARRAY_TYPE) | |
8959 | { | |
8960 | tree t; | |
8961 | tree element_type = c_build_qualified_type (TREE_TYPE (type), | |
8962 | type_quals); | |
8963 | ||
8964 | /* See if we already have an identically qualified type. */ | |
8965 | for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) | |
8966 | { | |
8967 | if (TYPE_QUALS (strip_array_types (t)) == type_quals | |
8968 | && TYPE_NAME (t) == TYPE_NAME (type) | |
8969 | && TYPE_CONTEXT (t) == TYPE_CONTEXT (type) | |
8970 | && attribute_list_equal (TYPE_ATTRIBUTES (t), | |
8971 | TYPE_ATTRIBUTES (type))) | |
8972 | break; | |
8973 | } | |
8974 | if (!t) | |
8975 | { | |
8976 | tree domain = TYPE_DOMAIN (type); | |
8977 | ||
8978 | t = build_variant_type_copy (type); | |
8979 | TREE_TYPE (t) = element_type; | |
8980 | ||
8981 | if (TYPE_STRUCTURAL_EQUALITY_P (element_type) | |
8982 | || (domain && TYPE_STRUCTURAL_EQUALITY_P (domain))) | |
8983 | SET_TYPE_STRUCTURAL_EQUALITY (t); | |
8984 | else if (TYPE_CANONICAL (element_type) != element_type | |
8985 | || (domain && TYPE_CANONICAL (domain) != domain)) | |
8986 | { | |
8987 | tree unqualified_canon | |
8988 | = build_array_type (TYPE_CANONICAL (element_type), | |
8989 | domain? TYPE_CANONICAL (domain) | |
8990 | : NULL_TREE); | |
8991 | TYPE_CANONICAL (t) | |
8992 | = c_build_qualified_type (unqualified_canon, type_quals); | |
8993 | } | |
8994 | else | |
8995 | TYPE_CANONICAL (t) = t; | |
8996 | } | |
8997 | return t; | |
8998 | } | |
8999 | ||
9000 | /* A restrict-qualified pointer type must be a pointer to object or | |
9001 | incomplete type. Note that the use of POINTER_TYPE_P also allows | |
9002 | REFERENCE_TYPEs, which is appropriate for C++. */ | |
9003 | if ((type_quals & TYPE_QUAL_RESTRICT) | |
9004 | && (!POINTER_TYPE_P (type) | |
9005 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
9006 | { | |
9007 | error ("invalid use of %<restrict%>"); | |
9008 | type_quals &= ~TYPE_QUAL_RESTRICT; | |
9009 | } | |
9010 | ||
9011 | return build_qualified_type (type, type_quals); | |
9012 | } |