]>
Commit | Line | Data |
---|---|---|
400fbf9f | 1 | /* Build expressions with type checking for C compiler. |
0953878d JM |
2 | Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. | |
400fbf9f | 4 | |
1322177d | 5 | This file is part of GCC. |
400fbf9f | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
400fbf9f | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
400fbf9f JW |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
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 | ||
f55ade6e | 77 | static tree qualify_type (tree, tree); |
132da1a5 | 78 | static int tagged_types_tu_compatible_p (tree, tree); |
58393038 | 79 | static int comp_target_types (tree, tree); |
132da1a5 JM |
80 | static int function_types_compatible_p (tree, tree); |
81 | static int type_lists_compatible_p (tree, tree); | |
f55ade6e AJ |
82 | static tree decl_constant_value_for_broken_optimization (tree); |
83 | static tree default_function_array_conversion (tree); | |
84 | static tree lookup_field (tree, tree); | |
f55ade6e AJ |
85 | static tree convert_arguments (tree, tree, tree, tree); |
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); | |
92 | static void push_array_bounds (int); | |
93 | static int spelling_length (void); | |
94 | static char *print_spelling (char *); | |
95 | static void warning_init (const char *); | |
916c5919 JM |
96 | static tree digest_init (tree, tree, bool, int); |
97 | static void output_init_element (tree, bool, tree, tree, int); | |
f55ade6e AJ |
98 | static void output_pending_init_elements (int); |
99 | static int set_designator (int); | |
100 | static void push_range_stack (tree); | |
101 | static void add_pending_init (tree, tree); | |
102 | static void set_nonincremental_init (void); | |
103 | static void set_nonincremental_init_from_string (tree); | |
104 | static tree find_init_member (tree); | |
9bf24266 | 105 | static void readonly_error (tree, enum lvalue_use); |
37dc0d8d JM |
106 | static int lvalue_or_else (tree, enum lvalue_use); |
107 | static int lvalue_p (tree); | |
4e2fb7de | 108 | static void record_maybe_used_decl (tree); |
400fbf9f JW |
109 | \f |
110 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
111 | does not have an incomplete type. (That includes void types.) */ | |
112 | ||
113 | tree | |
2f6e4e97 | 114 | require_complete_type (tree value) |
400fbf9f JW |
115 | { |
116 | tree type = TREE_TYPE (value); | |
117 | ||
c3d5c3fa | 118 | if (value == error_mark_node || type == error_mark_node) |
ea0f786b CB |
119 | return error_mark_node; |
120 | ||
400fbf9f | 121 | /* First, detect a valid value with a complete type. */ |
d0f062fb | 122 | if (COMPLETE_TYPE_P (type)) |
400fbf9f JW |
123 | return value; |
124 | ||
7a228918 | 125 | c_incomplete_type_error (value, type); |
400fbf9f JW |
126 | return error_mark_node; |
127 | } | |
128 | ||
129 | /* Print an error message for invalid use of an incomplete type. | |
130 | VALUE is the expression that was used (or 0 if that isn't known) | |
131 | and TYPE is the type that was invalid. */ | |
132 | ||
133 | void | |
2f6e4e97 | 134 | c_incomplete_type_error (tree value, tree type) |
400fbf9f | 135 | { |
5d5993dd | 136 | const char *type_code_string; |
400fbf9f JW |
137 | |
138 | /* Avoid duplicate error message. */ | |
139 | if (TREE_CODE (type) == ERROR_MARK) | |
140 | return; | |
141 | ||
142 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
143 | || TREE_CODE (value) == PARM_DECL)) | |
c51a1ba9 | 144 | error ("%qD has an incomplete type", value); |
400fbf9f JW |
145 | else |
146 | { | |
147 | retry: | |
148 | /* We must print an error message. Be clever about what it says. */ | |
149 | ||
150 | switch (TREE_CODE (type)) | |
151 | { | |
152 | case RECORD_TYPE: | |
ab87f8c8 | 153 | type_code_string = "struct"; |
400fbf9f JW |
154 | break; |
155 | ||
156 | case UNION_TYPE: | |
ab87f8c8 | 157 | type_code_string = "union"; |
400fbf9f JW |
158 | break; |
159 | ||
160 | case ENUMERAL_TYPE: | |
ab87f8c8 | 161 | type_code_string = "enum"; |
400fbf9f JW |
162 | break; |
163 | ||
164 | case VOID_TYPE: | |
165 | error ("invalid use of void expression"); | |
166 | return; | |
167 | ||
168 | case ARRAY_TYPE: | |
169 | if (TYPE_DOMAIN (type)) | |
170 | { | |
fba78abb RH |
171 | if (TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL) |
172 | { | |
173 | error ("invalid use of flexible array member"); | |
174 | return; | |
175 | } | |
400fbf9f JW |
176 | type = TREE_TYPE (type); |
177 | goto retry; | |
178 | } | |
179 | error ("invalid use of array with unspecified bounds"); | |
180 | return; | |
181 | ||
182 | default: | |
366de0ce | 183 | gcc_unreachable (); |
400fbf9f JW |
184 | } |
185 | ||
186 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
c51a1ba9 JM |
187 | error ("invalid use of undefined type %<%s %E%>", |
188 | type_code_string, TYPE_NAME (type)); | |
400fbf9f JW |
189 | else |
190 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
c51a1ba9 | 191 | error ("invalid use of incomplete typedef %qD", TYPE_NAME (type)); |
400fbf9f JW |
192 | } |
193 | } | |
194 | ||
ab393bf1 NB |
195 | /* Given a type, apply default promotions wrt unnamed function |
196 | arguments and return the new type. */ | |
197 | ||
198 | tree | |
2f6e4e97 | 199 | c_type_promotes_to (tree type) |
ab393bf1 NB |
200 | { |
201 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
202 | return double_type_node; | |
203 | ||
204 | if (c_promoting_integer_type_p (type)) | |
205 | { | |
206 | /* Preserve unsignedness if not really getting any wider. */ | |
8df83eae | 207 | if (TYPE_UNSIGNED (type) |
ab393bf1 NB |
208 | && (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) |
209 | return unsigned_type_node; | |
210 | return integer_type_node; | |
211 | } | |
212 | ||
213 | return type; | |
214 | } | |
215 | ||
400fbf9f JW |
216 | /* Return a variant of TYPE which has all the type qualifiers of LIKE |
217 | as well as those of TYPE. */ | |
218 | ||
219 | static tree | |
2f6e4e97 | 220 | qualify_type (tree type, tree like) |
400fbf9f | 221 | { |
2f6e4e97 | 222 | return c_build_qualified_type (type, |
afbadaa7 | 223 | TYPE_QUALS (type) | TYPE_QUALS (like)); |
400fbf9f JW |
224 | } |
225 | \f | |
10bc1b1b | 226 | /* Return the composite type of two compatible types. |
5305f6d7 | 227 | |
10bc1b1b JM |
228 | We assume that comptypes has already been done and returned |
229 | nonzero; if that isn't so, this may crash. In particular, we | |
230 | assume that qualifiers match. */ | |
400fbf9f JW |
231 | |
232 | tree | |
10bc1b1b | 233 | composite_type (tree t1, tree t2) |
400fbf9f | 234 | { |
b3694847 SS |
235 | enum tree_code code1; |
236 | enum tree_code code2; | |
4b027d16 | 237 | tree attributes; |
400fbf9f JW |
238 | |
239 | /* Save time if the two types are the same. */ | |
240 | ||
241 | if (t1 == t2) return t1; | |
242 | ||
243 | /* If one type is nonsense, use the other. */ | |
244 | if (t1 == error_mark_node) | |
245 | return t2; | |
246 | if (t2 == error_mark_node) | |
247 | return t1; | |
248 | ||
10bc1b1b JM |
249 | code1 = TREE_CODE (t1); |
250 | code2 = TREE_CODE (t2); | |
251 | ||
d9525bec | 252 | /* Merge the attributes. */ |
5fd9b178 | 253 | attributes = targetm.merge_type_attributes (t1, t2); |
4b027d16 | 254 | |
10bc1b1b JM |
255 | /* If one is an enumerated type and the other is the compatible |
256 | integer type, the composite type might be either of the two | |
257 | (DR#013 question 3). For consistency, use the enumerated type as | |
258 | the composite type. */ | |
400fbf9f | 259 | |
10bc1b1b JM |
260 | if (code1 == ENUMERAL_TYPE && code2 == INTEGER_TYPE) |
261 | return t1; | |
262 | if (code2 == ENUMERAL_TYPE && code1 == INTEGER_TYPE) | |
263 | return t2; | |
75326e8c | 264 | |
366de0ce | 265 | gcc_assert (code1 == code2); |
b6a10c9f | 266 | |
400fbf9f JW |
267 | switch (code1) |
268 | { | |
400fbf9f | 269 | case POINTER_TYPE: |
10bc1b1b | 270 | /* For two pointers, do this recursively on the target type. */ |
400fbf9f | 271 | { |
3932261a MM |
272 | tree pointed_to_1 = TREE_TYPE (t1); |
273 | tree pointed_to_2 = TREE_TYPE (t2); | |
10bc1b1b JM |
274 | tree target = composite_type (pointed_to_1, pointed_to_2); |
275 | t1 = build_pointer_type (target); | |
fe7080d2 AP |
276 | t1 = build_type_attribute_variant (t1, attributes); |
277 | return qualify_type (t1, t2); | |
400fbf9f | 278 | } |
400fbf9f JW |
279 | |
280 | case ARRAY_TYPE: | |
281 | { | |
10bc1b1b | 282 | tree elt = composite_type (TREE_TYPE (t1), TREE_TYPE (t2)); |
46df2823 JM |
283 | int quals; |
284 | tree unqual_elt; | |
285 | ||
de46b2fe | 286 | /* We should not have any type quals on arrays at all. */ |
366de0ce | 287 | gcc_assert (!TYPE_QUALS (t1) && !TYPE_QUALS (t2)); |
de46b2fe | 288 | |
400fbf9f JW |
289 | /* Save space: see if the result is identical to one of the args. */ |
290 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
4b027d16 | 291 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 292 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
4b027d16 | 293 | return build_type_attribute_variant (t2, attributes); |
de46b2fe AP |
294 | |
295 | if (elt == TREE_TYPE (t1) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1)) | |
296 | return build_type_attribute_variant (t1, attributes); | |
297 | if (elt == TREE_TYPE (t2) && !TYPE_DOMAIN (t2) && !TYPE_DOMAIN (t1)) | |
298 | return build_type_attribute_variant (t2, attributes); | |
299 | ||
46df2823 JM |
300 | /* Merge the element types, and have a size if either arg has |
301 | one. We may have qualifiers on the element types. To set | |
302 | up TYPE_MAIN_VARIANT correctly, we need to form the | |
303 | composite of the unqualified types and add the qualifiers | |
304 | back at the end. */ | |
305 | quals = TYPE_QUALS (strip_array_types (elt)); | |
306 | unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED); | |
307 | t1 = build_array_type (unqual_elt, | |
308 | TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); | |
309 | t1 = c_build_qualified_type (t1, quals); | |
de46b2fe | 310 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
311 | } |
312 | ||
313 | case FUNCTION_TYPE: | |
314 | /* Function types: prefer the one that specified arg types. | |
315 | If both do, merge the arg types. Also merge the return types. */ | |
316 | { | |
10bc1b1b | 317 | tree valtype = composite_type (TREE_TYPE (t1), TREE_TYPE (t2)); |
400fbf9f JW |
318 | tree p1 = TYPE_ARG_TYPES (t1); |
319 | tree p2 = TYPE_ARG_TYPES (t2); | |
320 | int len; | |
321 | tree newargs, n; | |
322 | int i; | |
323 | ||
324 | /* Save space: see if the result is identical to one of the args. */ | |
3f75a254 | 325 | if (valtype == TREE_TYPE (t1) && !TYPE_ARG_TYPES (t2)) |
4b027d16 | 326 | return build_type_attribute_variant (t1, attributes); |
3f75a254 | 327 | if (valtype == TREE_TYPE (t2) && !TYPE_ARG_TYPES (t1)) |
4b027d16 | 328 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
329 | |
330 | /* Simple way if one arg fails to specify argument types. */ | |
331 | if (TYPE_ARG_TYPES (t1) == 0) | |
4b027d16 | 332 | { |
fe7080d2 AP |
333 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2)); |
334 | t1 = build_type_attribute_variant (t1, attributes); | |
335 | return qualify_type (t1, t2); | |
4b027d16 | 336 | } |
400fbf9f | 337 | if (TYPE_ARG_TYPES (t2) == 0) |
4b027d16 RK |
338 | { |
339 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
fe7080d2 AP |
340 | t1 = build_type_attribute_variant (t1, attributes); |
341 | return qualify_type (t1, t2); | |
4b027d16 | 342 | } |
400fbf9f JW |
343 | |
344 | /* If both args specify argument types, we must merge the two | |
345 | lists, argument by argument. */ | |
f75fbaf7 | 346 | /* Tell global_bindings_p to return false so that variable_size |
535a42b1 | 347 | doesn't die on VLAs in parameter types. */ |
f75fbaf7 | 348 | c_override_global_bindings_to_false = true; |
2f4e8f2b | 349 | |
400fbf9f JW |
350 | len = list_length (p1); |
351 | newargs = 0; | |
352 | ||
353 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 354 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
355 | |
356 | n = newargs; | |
357 | ||
358 | for (; p1; | |
359 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
360 | { | |
361 | /* A null type means arg type is not specified. | |
362 | Take whatever the other function type has. */ | |
363 | if (TREE_VALUE (p1) == 0) | |
364 | { | |
365 | TREE_VALUE (n) = TREE_VALUE (p2); | |
366 | goto parm_done; | |
367 | } | |
368 | if (TREE_VALUE (p2) == 0) | |
369 | { | |
370 | TREE_VALUE (n) = TREE_VALUE (p1); | |
371 | goto parm_done; | |
372 | } | |
2f6e4e97 | 373 | |
400fbf9f JW |
374 | /* Given wait (union {union wait *u; int *i} *) |
375 | and wait (union wait *), | |
376 | prefer union wait * as type of parm. */ | |
377 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
378 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
379 | { | |
380 | tree memb; | |
58cb41e6 JJ |
381 | tree mv2 = TREE_VALUE (p2); |
382 | if (mv2 && mv2 != error_mark_node | |
383 | && TREE_CODE (mv2) != ARRAY_TYPE) | |
384 | mv2 = TYPE_MAIN_VARIANT (mv2); | |
400fbf9f JW |
385 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); |
386 | memb; memb = TREE_CHAIN (memb)) | |
58cb41e6 JJ |
387 | { |
388 | tree mv3 = TREE_TYPE (memb); | |
389 | if (mv3 && mv3 != error_mark_node | |
390 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
391 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
392 | if (comptypes (mv3, mv2)) | |
393 | { | |
394 | TREE_VALUE (n) = composite_type (TREE_TYPE (memb), | |
395 | TREE_VALUE (p2)); | |
396 | if (pedantic) | |
397 | pedwarn ("function types not truly compatible in ISO C"); | |
398 | goto parm_done; | |
399 | } | |
400 | } | |
400fbf9f JW |
401 | } |
402 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
403 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
404 | { | |
405 | tree memb; | |
58cb41e6 JJ |
406 | tree mv1 = TREE_VALUE (p1); |
407 | if (mv1 && mv1 != error_mark_node | |
408 | && TREE_CODE (mv1) != ARRAY_TYPE) | |
409 | mv1 = TYPE_MAIN_VARIANT (mv1); | |
400fbf9f JW |
410 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); |
411 | memb; memb = TREE_CHAIN (memb)) | |
58cb41e6 JJ |
412 | { |
413 | tree mv3 = TREE_TYPE (memb); | |
414 | if (mv3 && mv3 != error_mark_node | |
415 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
416 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
417 | if (comptypes (mv3, mv1)) | |
418 | { | |
419 | TREE_VALUE (n) = composite_type (TREE_TYPE (memb), | |
420 | TREE_VALUE (p1)); | |
421 | if (pedantic) | |
422 | pedwarn ("function types not truly compatible in ISO C"); | |
423 | goto parm_done; | |
424 | } | |
425 | } | |
400fbf9f | 426 | } |
10bc1b1b | 427 | TREE_VALUE (n) = composite_type (TREE_VALUE (p1), TREE_VALUE (p2)); |
400fbf9f JW |
428 | parm_done: ; |
429 | } | |
430 | ||
f75fbaf7 | 431 | c_override_global_bindings_to_false = false; |
4b027d16 | 432 | t1 = build_function_type (valtype, newargs); |
fe7080d2 | 433 | t1 = qualify_type (t1, t2); |
0f41302f | 434 | /* ... falls through ... */ |
400fbf9f JW |
435 | } |
436 | ||
437 | default: | |
4b027d16 | 438 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
439 | } |
440 | ||
441 | } | |
10bc1b1b JM |
442 | |
443 | /* Return the type of a conditional expression between pointers to | |
444 | possibly differently qualified versions of compatible types. | |
445 | ||
446 | We assume that comp_target_types has already been done and returned | |
447 | nonzero; if that isn't so, this may crash. */ | |
448 | ||
449 | static tree | |
450 | common_pointer_type (tree t1, tree t2) | |
451 | { | |
452 | tree attributes; | |
46df2823 JM |
453 | tree pointed_to_1, mv1; |
454 | tree pointed_to_2, mv2; | |
10bc1b1b JM |
455 | tree target; |
456 | ||
457 | /* Save time if the two types are the same. */ | |
458 | ||
459 | if (t1 == t2) return t1; | |
460 | ||
461 | /* If one type is nonsense, use the other. */ | |
462 | if (t1 == error_mark_node) | |
463 | return t2; | |
464 | if (t2 == error_mark_node) | |
465 | return t1; | |
466 | ||
366de0ce NS |
467 | gcc_assert (TREE_CODE (t1) == POINTER_TYPE |
468 | && TREE_CODE (t2) == POINTER_TYPE); | |
10bc1b1b JM |
469 | |
470 | /* Merge the attributes. */ | |
471 | attributes = targetm.merge_type_attributes (t1, t2); | |
472 | ||
473 | /* Find the composite type of the target types, and combine the | |
46df2823 JM |
474 | qualifiers of the two types' targets. Do not lose qualifiers on |
475 | array element types by taking the TYPE_MAIN_VARIANT. */ | |
476 | mv1 = pointed_to_1 = TREE_TYPE (t1); | |
477 | mv2 = pointed_to_2 = TREE_TYPE (t2); | |
478 | if (TREE_CODE (mv1) != ARRAY_TYPE) | |
479 | mv1 = TYPE_MAIN_VARIANT (pointed_to_1); | |
480 | if (TREE_CODE (mv2) != ARRAY_TYPE) | |
481 | mv2 = TYPE_MAIN_VARIANT (pointed_to_2); | |
482 | target = composite_type (mv1, mv2); | |
10bc1b1b JM |
483 | t1 = build_pointer_type (c_build_qualified_type |
484 | (target, | |
485 | TYPE_QUALS (pointed_to_1) | | |
486 | TYPE_QUALS (pointed_to_2))); | |
487 | return build_type_attribute_variant (t1, attributes); | |
488 | } | |
489 | ||
490 | /* Return the common type for two arithmetic types under the usual | |
491 | arithmetic conversions. The default conversions have already been | |
492 | applied, and enumerated types converted to their compatible integer | |
493 | types. The resulting type is unqualified and has no attributes. | |
494 | ||
495 | This is the type for the result of most arithmetic operations | |
496 | if the operands have the given two types. */ | |
497 | ||
ccf7f880 JJ |
498 | static tree |
499 | c_common_type (tree t1, tree t2) | |
10bc1b1b JM |
500 | { |
501 | enum tree_code code1; | |
502 | enum tree_code code2; | |
503 | ||
504 | /* If one type is nonsense, use the other. */ | |
505 | if (t1 == error_mark_node) | |
506 | return t2; | |
507 | if (t2 == error_mark_node) | |
508 | return t1; | |
509 | ||
510 | if (TYPE_QUALS (t1) != TYPE_UNQUALIFIED) | |
511 | t1 = TYPE_MAIN_VARIANT (t1); | |
512 | ||
513 | if (TYPE_QUALS (t2) != TYPE_UNQUALIFIED) | |
514 | t2 = TYPE_MAIN_VARIANT (t2); | |
515 | ||
516 | if (TYPE_ATTRIBUTES (t1) != NULL_TREE) | |
517 | t1 = build_type_attribute_variant (t1, NULL_TREE); | |
518 | ||
519 | if (TYPE_ATTRIBUTES (t2) != NULL_TREE) | |
520 | t2 = build_type_attribute_variant (t2, NULL_TREE); | |
521 | ||
522 | /* Save time if the two types are the same. */ | |
523 | ||
524 | if (t1 == t2) return t1; | |
525 | ||
526 | code1 = TREE_CODE (t1); | |
527 | code2 = TREE_CODE (t2); | |
528 | ||
366de0ce NS |
529 | gcc_assert (code1 == VECTOR_TYPE || code1 == COMPLEX_TYPE |
530 | || code1 == REAL_TYPE || code1 == INTEGER_TYPE); | |
531 | gcc_assert (code2 == VECTOR_TYPE || code2 == COMPLEX_TYPE | |
532 | || code2 == REAL_TYPE || code2 == INTEGER_TYPE); | |
10bc1b1b JM |
533 | |
534 | /* If one type is a vector type, return that type. (How the usual | |
535 | arithmetic conversions apply to the vector types extension is not | |
536 | precisely specified.) */ | |
537 | if (code1 == VECTOR_TYPE) | |
538 | return t1; | |
539 | ||
540 | if (code2 == VECTOR_TYPE) | |
541 | return t2; | |
542 | ||
543 | /* If one type is complex, form the common type of the non-complex | |
544 | components, then make that complex. Use T1 or T2 if it is the | |
545 | required type. */ | |
546 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
547 | { | |
548 | tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; | |
549 | tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; | |
ccf7f880 | 550 | tree subtype = c_common_type (subtype1, subtype2); |
10bc1b1b JM |
551 | |
552 | if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) | |
553 | return t1; | |
554 | else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) | |
555 | return t2; | |
556 | else | |
557 | return build_complex_type (subtype); | |
558 | } | |
559 | ||
560 | /* If only one is real, use it as the result. */ | |
561 | ||
562 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
563 | return t1; | |
564 | ||
565 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
566 | return t2; | |
567 | ||
568 | /* Both real or both integers; use the one with greater precision. */ | |
569 | ||
570 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
571 | return t1; | |
572 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) | |
573 | return t2; | |
574 | ||
575 | /* Same precision. Prefer long longs to longs to ints when the | |
576 | same precision, following the C99 rules on integer type rank | |
577 | (which are equivalent to the C90 rules for C90 types). */ | |
578 | ||
579 | if (TYPE_MAIN_VARIANT (t1) == long_long_unsigned_type_node | |
580 | || TYPE_MAIN_VARIANT (t2) == long_long_unsigned_type_node) | |
581 | return long_long_unsigned_type_node; | |
582 | ||
583 | if (TYPE_MAIN_VARIANT (t1) == long_long_integer_type_node | |
584 | || TYPE_MAIN_VARIANT (t2) == long_long_integer_type_node) | |
585 | { | |
586 | if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) | |
587 | return long_long_unsigned_type_node; | |
588 | else | |
589 | return long_long_integer_type_node; | |
590 | } | |
591 | ||
592 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node | |
593 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
594 | return long_unsigned_type_node; | |
595 | ||
596 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node | |
597 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
598 | { | |
599 | /* But preserve unsignedness from the other type, | |
600 | since long cannot hold all the values of an unsigned int. */ | |
601 | if (TYPE_UNSIGNED (t1) || TYPE_UNSIGNED (t2)) | |
602 | return long_unsigned_type_node; | |
603 | else | |
604 | return long_integer_type_node; | |
605 | } | |
606 | ||
607 | /* Likewise, prefer long double to double even if same size. */ | |
608 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node | |
609 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
610 | return long_double_type_node; | |
611 | ||
612 | /* Otherwise prefer the unsigned one. */ | |
613 | ||
614 | if (TYPE_UNSIGNED (t1)) | |
615 | return t1; | |
616 | else | |
617 | return t2; | |
618 | } | |
400fbf9f | 619 | \f |
ccf7f880 | 620 | /* Wrapper around c_common_type that is used by c-common.c. ENUMERAL_TYPEs |
b2232745 RS |
621 | are allowed here and are converted to their compatible integer types. |
622 | BOOLEAN_TYPEs are allowed here and return either boolean_type_node or | |
623 | preferably a non-Boolean type as the common type. */ | |
ccf7f880 JJ |
624 | tree |
625 | common_type (tree t1, tree t2) | |
626 | { | |
627 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
628 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1); | |
629 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
630 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1); | |
b2232745 RS |
631 | |
632 | /* If both types are BOOLEAN_TYPE, then return boolean_type_node. */ | |
633 | if (TREE_CODE (t1) == BOOLEAN_TYPE | |
634 | && TREE_CODE (t2) == BOOLEAN_TYPE) | |
635 | return boolean_type_node; | |
636 | ||
637 | /* If either type is BOOLEAN_TYPE, then return the other. */ | |
638 | if (TREE_CODE (t1) == BOOLEAN_TYPE) | |
639 | return t2; | |
640 | if (TREE_CODE (t2) == BOOLEAN_TYPE) | |
641 | return t1; | |
642 | ||
ccf7f880 JJ |
643 | return c_common_type (t1, t2); |
644 | } | |
645 | \f | |
400fbf9f JW |
646 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment |
647 | or various other operations. Return 2 if they are compatible | |
648 | but a warning may be needed if you use them together. */ | |
649 | ||
650 | int | |
132da1a5 | 651 | comptypes (tree type1, tree type2) |
400fbf9f | 652 | { |
b3694847 SS |
653 | tree t1 = type1; |
654 | tree t2 = type2; | |
4b027d16 | 655 | int attrval, val; |
400fbf9f JW |
656 | |
657 | /* Suppress errors caused by previously reported errors. */ | |
658 | ||
8d47dfc5 RH |
659 | if (t1 == t2 || !t1 || !t2 |
660 | || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
400fbf9f JW |
661 | return 1; |
662 | ||
21318741 RK |
663 | /* If either type is the internal version of sizetype, return the |
664 | language version. */ | |
665 | if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1) | |
eb1a2c88 DN |
666 | && TYPE_ORIG_SIZE_TYPE (t1)) |
667 | t1 = TYPE_ORIG_SIZE_TYPE (t1); | |
21318741 RK |
668 | |
669 | if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2) | |
eb1a2c88 DN |
670 | && TYPE_ORIG_SIZE_TYPE (t2)) |
671 | t2 = TYPE_ORIG_SIZE_TYPE (t2); | |
672 | ||
21318741 | 673 | |
bca63328 JM |
674 | /* Enumerated types are compatible with integer types, but this is |
675 | not transitive: two enumerated types in the same translation unit | |
676 | are compatible with each other only if they are the same type. */ | |
400fbf9f | 677 | |
bca63328 | 678 | if (TREE_CODE (t1) == ENUMERAL_TYPE && TREE_CODE (t2) != ENUMERAL_TYPE) |
8df83eae | 679 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), TYPE_UNSIGNED (t1)); |
bca63328 | 680 | else if (TREE_CODE (t2) == ENUMERAL_TYPE && TREE_CODE (t1) != ENUMERAL_TYPE) |
8df83eae | 681 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), TYPE_UNSIGNED (t2)); |
400fbf9f JW |
682 | |
683 | if (t1 == t2) | |
684 | return 1; | |
685 | ||
686 | /* Different classes of types can't be compatible. */ | |
687 | ||
3aeb3655 EC |
688 | if (TREE_CODE (t1) != TREE_CODE (t2)) |
689 | return 0; | |
400fbf9f | 690 | |
118a3a8b | 691 | /* Qualifiers must match. C99 6.7.3p9 */ |
400fbf9f | 692 | |
3932261a | 693 | if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) |
400fbf9f JW |
694 | return 0; |
695 | ||
08632da2 RS |
696 | /* Allow for two different type nodes which have essentially the same |
697 | definition. Note that we already checked for equality of the type | |
38e01259 | 698 | qualifiers (just above). */ |
400fbf9f | 699 | |
46df2823 JM |
700 | if (TREE_CODE (t1) != ARRAY_TYPE |
701 | && TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
400fbf9f JW |
702 | return 1; |
703 | ||
4b027d16 | 704 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ |
3f75a254 | 705 | if (!(attrval = targetm.comp_type_attributes (t1, t2))) |
4b027d16 RK |
706 | return 0; |
707 | ||
708 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
709 | val = 0; | |
710 | ||
400fbf9f JW |
711 | switch (TREE_CODE (t1)) |
712 | { | |
713 | case POINTER_TYPE: | |
106f5de5 UW |
714 | /* Do not remove mode or aliasing information. */ |
715 | if (TYPE_MODE (t1) != TYPE_MODE (t2) | |
716 | || TYPE_REF_CAN_ALIAS_ALL (t1) != TYPE_REF_CAN_ALIAS_ALL (t2)) | |
717 | break; | |
4b027d16 | 718 | val = (TREE_TYPE (t1) == TREE_TYPE (t2) |
132da1a5 | 719 | ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2))); |
4b027d16 | 720 | break; |
400fbf9f JW |
721 | |
722 | case FUNCTION_TYPE: | |
132da1a5 | 723 | val = function_types_compatible_p (t1, t2); |
4b027d16 | 724 | break; |
400fbf9f JW |
725 | |
726 | case ARRAY_TYPE: | |
727 | { | |
400fbf9f JW |
728 | tree d1 = TYPE_DOMAIN (t1); |
729 | tree d2 = TYPE_DOMAIN (t2); | |
3f85558f RH |
730 | bool d1_variable, d2_variable; |
731 | bool d1_zero, d2_zero; | |
4b027d16 | 732 | val = 1; |
400fbf9f JW |
733 | |
734 | /* Target types must match incl. qualifiers. */ | |
735 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
132da1a5 | 736 | && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))) |
400fbf9f JW |
737 | return 0; |
738 | ||
739 | /* Sizes must match unless one is missing or variable. */ | |
3f85558f | 740 | if (d1 == 0 || d2 == 0 || d1 == d2) |
4b027d16 | 741 | break; |
400fbf9f | 742 | |
3f75a254 JM |
743 | d1_zero = !TYPE_MAX_VALUE (d1); |
744 | d2_zero = !TYPE_MAX_VALUE (d2); | |
3f85558f | 745 | |
3f75a254 | 746 | d1_variable = (!d1_zero |
3f85558f RH |
747 | && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST |
748 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST)); | |
3f75a254 | 749 | d2_variable = (!d2_zero |
3f85558f RH |
750 | && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST |
751 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)); | |
752 | ||
753 | if (d1_variable || d2_variable) | |
754 | break; | |
755 | if (d1_zero && d2_zero) | |
756 | break; | |
757 | if (d1_zero || d2_zero | |
3f75a254 JM |
758 | || !tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2)) |
759 | || !tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2))) | |
05bccae2 RK |
760 | val = 0; |
761 | ||
4b027d16 | 762 | break; |
400fbf9f JW |
763 | } |
764 | ||
d1bd0ded | 765 | case ENUMERAL_TYPE: |
58393038 | 766 | case RECORD_TYPE: |
d1bd0ded | 767 | case UNION_TYPE: |
766beae1 | 768 | if (val != 1 && !same_translation_unit_p (t1, t2)) |
132da1a5 | 769 | val = tagged_types_tu_compatible_p (t1, t2); |
4b027d16 | 770 | break; |
e9a25f70 | 771 | |
62e1dfcf | 772 | case VECTOR_TYPE: |
cc27e657 | 773 | val = TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) |
132da1a5 | 774 | && comptypes (TREE_TYPE (t1), TREE_TYPE (t2)); |
62e1dfcf NC |
775 | break; |
776 | ||
e9a25f70 JL |
777 | default: |
778 | break; | |
400fbf9f | 779 | } |
4b027d16 | 780 | return attrval == 2 && val == 1 ? 2 : val; |
400fbf9f JW |
781 | } |
782 | ||
783 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
58393038 | 784 | ignoring their qualifiers. */ |
400fbf9f JW |
785 | |
786 | static int | |
58393038 | 787 | comp_target_types (tree ttl, tree ttr) |
400fbf9f | 788 | { |
392202b0 | 789 | int val; |
46df2823 | 790 | tree mvl, mvr; |
8b40563c | 791 | |
46df2823 JM |
792 | /* Do not lose qualifiers on element types of array types that are |
793 | pointer targets by taking their TYPE_MAIN_VARIANT. */ | |
794 | mvl = TREE_TYPE (ttl); | |
795 | mvr = TREE_TYPE (ttr); | |
796 | if (TREE_CODE (mvl) != ARRAY_TYPE) | |
797 | mvl = TYPE_MAIN_VARIANT (mvl); | |
798 | if (TREE_CODE (mvr) != ARRAY_TYPE) | |
799 | mvr = TYPE_MAIN_VARIANT (mvr); | |
800 | val = comptypes (mvl, mvr); | |
8b40563c | 801 | |
400fbf9f JW |
802 | if (val == 2 && pedantic) |
803 | pedwarn ("types are not quite compatible"); | |
804 | return val; | |
805 | } | |
806 | \f | |
807 | /* Subroutines of `comptypes'. */ | |
808 | ||
f75fbaf7 ZW |
809 | /* Determine whether two trees derive from the same translation unit. |
810 | If the CONTEXT chain ends in a null, that tree's context is still | |
811 | being parsed, so if two trees have context chains ending in null, | |
766beae1 | 812 | they're in the same translation unit. */ |
f75fbaf7 | 813 | int |
766beae1 ZW |
814 | same_translation_unit_p (tree t1, tree t2) |
815 | { | |
816 | while (t1 && TREE_CODE (t1) != TRANSLATION_UNIT_DECL) | |
817 | switch (TREE_CODE_CLASS (TREE_CODE (t1))) | |
818 | { | |
6615c446 JO |
819 | case tcc_declaration: |
820 | t1 = DECL_CONTEXT (t1); break; | |
821 | case tcc_type: | |
822 | t1 = TYPE_CONTEXT (t1); break; | |
823 | case tcc_exceptional: | |
824 | t1 = BLOCK_SUPERCONTEXT (t1); break; /* assume block */ | |
366de0ce | 825 | default: gcc_unreachable (); |
766beae1 ZW |
826 | } |
827 | ||
828 | while (t2 && TREE_CODE (t2) != TRANSLATION_UNIT_DECL) | |
829 | switch (TREE_CODE_CLASS (TREE_CODE (t2))) | |
830 | { | |
6615c446 JO |
831 | case tcc_declaration: |
832 | t2 = DECL_CONTEXT (t2); break; | |
833 | case tcc_type: | |
834 | t2 = TYPE_CONTEXT (t2); break; | |
835 | case tcc_exceptional: | |
836 | t2 = BLOCK_SUPERCONTEXT (t2); break; /* assume block */ | |
366de0ce | 837 | default: gcc_unreachable (); |
766beae1 ZW |
838 | } |
839 | ||
840 | return t1 == t2; | |
841 | } | |
842 | ||
d1bd0ded GK |
843 | /* The C standard says that two structures in different translation |
844 | units are compatible with each other only if the types of their | |
845 | fields are compatible (among other things). So, consider two copies | |
846 | of this structure: */ | |
847 | ||
848 | struct tagged_tu_seen { | |
849 | const struct tagged_tu_seen * next; | |
850 | tree t1; | |
851 | tree t2; | |
852 | }; | |
853 | ||
854 | /* Can they be compatible with each other? We choose to break the | |
855 | recursion by allowing those types to be compatible. */ | |
856 | ||
857 | static const struct tagged_tu_seen * tagged_tu_seen_base; | |
858 | ||
859 | /* Return 1 if two 'struct', 'union', or 'enum' types T1 and T2 are | |
860 | compatible. If the two types are not the same (which has been | |
861 | checked earlier), this can only happen when multiple translation | |
862 | units are being compiled. See C99 6.2.7 paragraph 1 for the exact | |
863 | rules. */ | |
864 | ||
865 | static int | |
132da1a5 | 866 | tagged_types_tu_compatible_p (tree t1, tree t2) |
d1bd0ded GK |
867 | { |
868 | tree s1, s2; | |
869 | bool needs_warning = false; | |
3aeb3655 | 870 | |
d1bd0ded GK |
871 | /* We have to verify that the tags of the types are the same. This |
872 | is harder than it looks because this may be a typedef, so we have | |
873 | to go look at the original type. It may even be a typedef of a | |
6de9cd9a DN |
874 | typedef... |
875 | In the case of compiler-created builtin structs the TYPE_DECL | |
876 | may be a dummy, with no DECL_ORIGINAL_TYPE. Don't fault. */ | |
dea984dc ILT |
877 | while (TYPE_NAME (t1) |
878 | && TREE_CODE (TYPE_NAME (t1)) == TYPE_DECL | |
879 | && DECL_ORIGINAL_TYPE (TYPE_NAME (t1))) | |
d1bd0ded GK |
880 | t1 = DECL_ORIGINAL_TYPE (TYPE_NAME (t1)); |
881 | ||
dea984dc ILT |
882 | while (TYPE_NAME (t2) |
883 | && TREE_CODE (TYPE_NAME (t2)) == TYPE_DECL | |
884 | && DECL_ORIGINAL_TYPE (TYPE_NAME (t2))) | |
d1bd0ded GK |
885 | t2 = DECL_ORIGINAL_TYPE (TYPE_NAME (t2)); |
886 | ||
887 | /* C90 didn't have the requirement that the two tags be the same. */ | |
888 | if (flag_isoc99 && TYPE_NAME (t1) != TYPE_NAME (t2)) | |
889 | return 0; | |
3aeb3655 | 890 | |
d1bd0ded GK |
891 | /* C90 didn't say what happened if one or both of the types were |
892 | incomplete; we choose to follow C99 rules here, which is that they | |
893 | are compatible. */ | |
894 | if (TYPE_SIZE (t1) == NULL | |
895 | || TYPE_SIZE (t2) == NULL) | |
896 | return 1; | |
3aeb3655 | 897 | |
d1bd0ded GK |
898 | { |
899 | const struct tagged_tu_seen * tts_i; | |
900 | for (tts_i = tagged_tu_seen_base; tts_i != NULL; tts_i = tts_i->next) | |
901 | if (tts_i->t1 == t1 && tts_i->t2 == t2) | |
902 | return 1; | |
903 | } | |
3aeb3655 | 904 | |
d1bd0ded GK |
905 | switch (TREE_CODE (t1)) |
906 | { | |
907 | case ENUMERAL_TYPE: | |
908 | { | |
3aeb3655 | 909 | |
71cc389b | 910 | /* Speed up the case where the type values are in the same order. */ |
dedbabed AP |
911 | tree tv1 = TYPE_VALUES (t1); |
912 | tree tv2 = TYPE_VALUES (t2); | |
3aeb3655 | 913 | |
dedbabed AP |
914 | if (tv1 == tv2) |
915 | return 1; | |
3aeb3655 | 916 | |
f38f747d | 917 | for (;tv1 && tv2; tv1 = TREE_CHAIN (tv1), tv2 = TREE_CHAIN (tv2)) |
dedbabed | 918 | { |
8cd6bdd1 | 919 | if (TREE_PURPOSE (tv1) != TREE_PURPOSE (tv2)) |
dedbabed AP |
920 | break; |
921 | if (simple_cst_equal (TREE_VALUE (tv1), TREE_VALUE (tv2)) != 1) | |
922 | return 0; | |
923 | } | |
3aeb3655 | 924 | |
dedbabed AP |
925 | if (tv1 == NULL_TREE && tv2 == NULL_TREE) |
926 | return 1; | |
927 | if (tv1 == NULL_TREE || tv2 == NULL_TREE) | |
928 | return 0; | |
3aeb3655 | 929 | |
d1bd0ded GK |
930 | if (list_length (TYPE_VALUES (t1)) != list_length (TYPE_VALUES (t2))) |
931 | return 0; | |
3aeb3655 | 932 | |
d1bd0ded GK |
933 | for (s1 = TYPE_VALUES (t1); s1; s1 = TREE_CHAIN (s1)) |
934 | { | |
935 | s2 = purpose_member (TREE_PURPOSE (s1), TYPE_VALUES (t2)); | |
936 | if (s2 == NULL | |
937 | || simple_cst_equal (TREE_VALUE (s1), TREE_VALUE (s2)) != 1) | |
938 | return 0; | |
939 | } | |
940 | return 1; | |
941 | } | |
942 | ||
943 | case UNION_TYPE: | |
944 | { | |
945 | if (list_length (TYPE_FIELDS (t1)) != list_length (TYPE_FIELDS (t2))) | |
946 | return 0; | |
947 | ||
948 | for (s1 = TYPE_FIELDS (t1); s1; s1 = TREE_CHAIN (s1)) | |
949 | { | |
950 | bool ok = false; | |
951 | struct tagged_tu_seen tts; | |
952 | ||
953 | tts.next = tagged_tu_seen_base; | |
954 | tts.t1 = t1; | |
955 | tts.t2 = t2; | |
956 | tagged_tu_seen_base = &tts; | |
3aeb3655 | 957 | |
d1bd0ded | 958 | if (DECL_NAME (s1) != NULL) |
398ce3dd | 959 | for (s2 = TYPE_FIELDS (t2); s2; s2 = TREE_CHAIN (s2)) |
d1bd0ded GK |
960 | if (DECL_NAME (s1) == DECL_NAME (s2)) |
961 | { | |
962 | int result; | |
132da1a5 | 963 | result = comptypes (TREE_TYPE (s1), TREE_TYPE (s2)); |
d1bd0ded GK |
964 | if (result == 0) |
965 | break; | |
966 | if (result == 2) | |
967 | needs_warning = true; | |
3aeb3655 | 968 | |
d1bd0ded GK |
969 | if (TREE_CODE (s1) == FIELD_DECL |
970 | && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1), | |
971 | DECL_FIELD_BIT_OFFSET (s2)) != 1) | |
972 | break; | |
973 | ||
974 | ok = true; | |
975 | break; | |
976 | } | |
977 | tagged_tu_seen_base = tts.next; | |
3f75a254 | 978 | if (!ok) |
d1bd0ded GK |
979 | return 0; |
980 | } | |
981 | return needs_warning ? 2 : 1; | |
982 | } | |
983 | ||
984 | case RECORD_TYPE: | |
985 | { | |
986 | struct tagged_tu_seen tts; | |
3aeb3655 | 987 | |
d1bd0ded GK |
988 | tts.next = tagged_tu_seen_base; |
989 | tts.t1 = t1; | |
990 | tts.t2 = t2; | |
991 | tagged_tu_seen_base = &tts; | |
3aeb3655 EC |
992 | |
993 | for (s1 = TYPE_FIELDS (t1), s2 = TYPE_FIELDS (t2); | |
d1bd0ded GK |
994 | s1 && s2; |
995 | s1 = TREE_CHAIN (s1), s2 = TREE_CHAIN (s2)) | |
996 | { | |
997 | int result; | |
998 | if (TREE_CODE (s1) != TREE_CODE (s2) | |
999 | || DECL_NAME (s1) != DECL_NAME (s2)) | |
1000 | break; | |
132da1a5 | 1001 | result = comptypes (TREE_TYPE (s1), TREE_TYPE (s2)); |
d1bd0ded GK |
1002 | if (result == 0) |
1003 | break; | |
1004 | if (result == 2) | |
1005 | needs_warning = true; | |
3aeb3655 | 1006 | |
d1bd0ded GK |
1007 | if (TREE_CODE (s1) == FIELD_DECL |
1008 | && simple_cst_equal (DECL_FIELD_BIT_OFFSET (s1), | |
1009 | DECL_FIELD_BIT_OFFSET (s2)) != 1) | |
1010 | break; | |
1011 | } | |
1012 | tagged_tu_seen_base = tts.next; | |
1013 | if (s1 && s2) | |
1014 | return 0; | |
1015 | return needs_warning ? 2 : 1; | |
1016 | } | |
1017 | ||
1018 | default: | |
366de0ce | 1019 | gcc_unreachable (); |
d1bd0ded GK |
1020 | } |
1021 | } | |
1022 | ||
400fbf9f JW |
1023 | /* Return 1 if two function types F1 and F2 are compatible. |
1024 | If either type specifies no argument types, | |
1025 | the other must specify a fixed number of self-promoting arg types. | |
2f6e4e97 | 1026 | Otherwise, if one type specifies only the number of arguments, |
400fbf9f JW |
1027 | the other must specify that number of self-promoting arg types. |
1028 | Otherwise, the argument types must match. */ | |
1029 | ||
1030 | static int | |
132da1a5 | 1031 | function_types_compatible_p (tree f1, tree f2) |
400fbf9f JW |
1032 | { |
1033 | tree args1, args2; | |
1034 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
1035 | int val = 1; | |
1036 | int val1; | |
a6fdc086 GK |
1037 | tree ret1, ret2; |
1038 | ||
1039 | ret1 = TREE_TYPE (f1); | |
1040 | ret2 = TREE_TYPE (f2); | |
1041 | ||
e508a019 JM |
1042 | /* 'volatile' qualifiers on a function's return type used to mean |
1043 | the function is noreturn. */ | |
1044 | if (TYPE_VOLATILE (ret1) != TYPE_VOLATILE (ret2)) | |
bda67431 | 1045 | pedwarn ("function return types not compatible due to %<volatile%>"); |
a6fdc086 GK |
1046 | if (TYPE_VOLATILE (ret1)) |
1047 | ret1 = build_qualified_type (TYPE_MAIN_VARIANT (ret1), | |
1048 | TYPE_QUALS (ret1) & ~TYPE_QUAL_VOLATILE); | |
1049 | if (TYPE_VOLATILE (ret2)) | |
1050 | ret2 = build_qualified_type (TYPE_MAIN_VARIANT (ret2), | |
1051 | TYPE_QUALS (ret2) & ~TYPE_QUAL_VOLATILE); | |
132da1a5 | 1052 | val = comptypes (ret1, ret2); |
a6fdc086 | 1053 | if (val == 0) |
400fbf9f JW |
1054 | return 0; |
1055 | ||
1056 | args1 = TYPE_ARG_TYPES (f1); | |
1057 | args2 = TYPE_ARG_TYPES (f2); | |
1058 | ||
1059 | /* An unspecified parmlist matches any specified parmlist | |
1060 | whose argument types don't need default promotions. */ | |
1061 | ||
1062 | if (args1 == 0) | |
1063 | { | |
1064 | if (!self_promoting_args_p (args2)) | |
1065 | return 0; | |
1066 | /* If one of these types comes from a non-prototype fn definition, | |
1067 | compare that with the other type's arglist. | |
d4ee4d25 | 1068 | If they don't match, ask for a warning (0, but no error). */ |
400fbf9f | 1069 | if (TYPE_ACTUAL_ARG_TYPES (f1) |
132da1a5 | 1070 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) |
400fbf9f JW |
1071 | val = 2; |
1072 | return val; | |
1073 | } | |
1074 | if (args2 == 0) | |
1075 | { | |
1076 | if (!self_promoting_args_p (args1)) | |
1077 | return 0; | |
1078 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
132da1a5 | 1079 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) |
400fbf9f JW |
1080 | val = 2; |
1081 | return val; | |
1082 | } | |
1083 | ||
1084 | /* Both types have argument lists: compare them and propagate results. */ | |
132da1a5 | 1085 | val1 = type_lists_compatible_p (args1, args2); |
400fbf9f JW |
1086 | return val1 != 1 ? val1 : val; |
1087 | } | |
1088 | ||
1089 | /* Check two lists of types for compatibility, | |
1090 | returning 0 for incompatible, 1 for compatible, | |
1091 | or 2 for compatible with warning. */ | |
1092 | ||
1093 | static int | |
132da1a5 | 1094 | type_lists_compatible_p (tree args1, tree args2) |
400fbf9f JW |
1095 | { |
1096 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
1097 | int val = 1; | |
9d5f3e49 | 1098 | int newval = 0; |
400fbf9f JW |
1099 | |
1100 | while (1) | |
1101 | { | |
46df2823 | 1102 | tree a1, mv1, a2, mv2; |
400fbf9f JW |
1103 | if (args1 == 0 && args2 == 0) |
1104 | return val; | |
1105 | /* If one list is shorter than the other, | |
1106 | they fail to match. */ | |
1107 | if (args1 == 0 || args2 == 0) | |
1108 | return 0; | |
46df2823 JM |
1109 | mv1 = a1 = TREE_VALUE (args1); |
1110 | mv2 = a2 = TREE_VALUE (args2); | |
1111 | if (mv1 && mv1 != error_mark_node && TREE_CODE (mv1) != ARRAY_TYPE) | |
1112 | mv1 = TYPE_MAIN_VARIANT (mv1); | |
1113 | if (mv2 && mv2 != error_mark_node && TREE_CODE (mv2) != ARRAY_TYPE) | |
1114 | mv2 = TYPE_MAIN_VARIANT (mv2); | |
400fbf9f JW |
1115 | /* A null pointer instead of a type |
1116 | means there is supposed to be an argument | |
1117 | but nothing is specified about what type it has. | |
1118 | So match anything that self-promotes. */ | |
46df2823 | 1119 | if (a1 == 0) |
400fbf9f | 1120 | { |
46df2823 | 1121 | if (c_type_promotes_to (a2) != a2) |
400fbf9f JW |
1122 | return 0; |
1123 | } | |
46df2823 | 1124 | else if (a2 == 0) |
400fbf9f | 1125 | { |
46df2823 | 1126 | if (c_type_promotes_to (a1) != a1) |
400fbf9f JW |
1127 | return 0; |
1128 | } | |
8f5b6d29 | 1129 | /* If one of the lists has an error marker, ignore this arg. */ |
46df2823 JM |
1130 | else if (TREE_CODE (a1) == ERROR_MARK |
1131 | || TREE_CODE (a2) == ERROR_MARK) | |
8f5b6d29 | 1132 | ; |
46df2823 | 1133 | else if (!(newval = comptypes (mv1, mv2))) |
400fbf9f JW |
1134 | { |
1135 | /* Allow wait (union {union wait *u; int *i} *) | |
1136 | and wait (union wait *) to be compatible. */ | |
46df2823 JM |
1137 | if (TREE_CODE (a1) == UNION_TYPE |
1138 | && (TYPE_NAME (a1) == 0 | |
1139 | || TYPE_TRANSPARENT_UNION (a1)) | |
1140 | && TREE_CODE (TYPE_SIZE (a1)) == INTEGER_CST | |
1141 | && tree_int_cst_equal (TYPE_SIZE (a1), | |
1142 | TYPE_SIZE (a2))) | |
400fbf9f JW |
1143 | { |
1144 | tree memb; | |
46df2823 | 1145 | for (memb = TYPE_FIELDS (a1); |
400fbf9f | 1146 | memb; memb = TREE_CHAIN (memb)) |
58cb41e6 JJ |
1147 | { |
1148 | tree mv3 = TREE_TYPE (memb); | |
1149 | if (mv3 && mv3 != error_mark_node | |
1150 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
1151 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
1152 | if (comptypes (mv3, mv2)) | |
1153 | break; | |
1154 | } | |
400fbf9f JW |
1155 | if (memb == 0) |
1156 | return 0; | |
1157 | } | |
46df2823 JM |
1158 | else if (TREE_CODE (a2) == UNION_TYPE |
1159 | && (TYPE_NAME (a2) == 0 | |
1160 | || TYPE_TRANSPARENT_UNION (a2)) | |
1161 | && TREE_CODE (TYPE_SIZE (a2)) == INTEGER_CST | |
1162 | && tree_int_cst_equal (TYPE_SIZE (a2), | |
1163 | TYPE_SIZE (a1))) | |
400fbf9f JW |
1164 | { |
1165 | tree memb; | |
46df2823 | 1166 | for (memb = TYPE_FIELDS (a2); |
400fbf9f | 1167 | memb; memb = TREE_CHAIN (memb)) |
58cb41e6 JJ |
1168 | { |
1169 | tree mv3 = TREE_TYPE (memb); | |
1170 | if (mv3 && mv3 != error_mark_node | |
1171 | && TREE_CODE (mv3) != ARRAY_TYPE) | |
1172 | mv3 = TYPE_MAIN_VARIANT (mv3); | |
1173 | if (comptypes (mv3, mv1)) | |
1174 | break; | |
1175 | } | |
400fbf9f JW |
1176 | if (memb == 0) |
1177 | return 0; | |
1178 | } | |
1179 | else | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /* comptypes said ok, but record if it said to warn. */ | |
1184 | if (newval > val) | |
1185 | val = newval; | |
1186 | ||
1187 | args1 = TREE_CHAIN (args1); | |
1188 | args2 = TREE_CHAIN (args2); | |
1189 | } | |
1190 | } | |
400fbf9f | 1191 | \f |
400fbf9f JW |
1192 | /* Compute the size to increment a pointer by. */ |
1193 | ||
4e2fb7de | 1194 | static tree |
2f6e4e97 | 1195 | c_size_in_bytes (tree type) |
400fbf9f JW |
1196 | { |
1197 | enum tree_code code = TREE_CODE (type); | |
1198 | ||
fed3cef0 RK |
1199 | if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK) |
1200 | return size_one_node; | |
1201 | ||
d0f062fb | 1202 | if (!COMPLETE_OR_VOID_TYPE_P (type)) |
400fbf9f JW |
1203 | { |
1204 | error ("arithmetic on pointer to an incomplete type"); | |
fed3cef0 | 1205 | return size_one_node; |
400fbf9f JW |
1206 | } |
1207 | ||
1208 | /* Convert in case a char is more than one unit. */ | |
fed3cef0 RK |
1209 | return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), |
1210 | size_int (TYPE_PRECISION (char_type_node) | |
1211 | / BITS_PER_UNIT)); | |
400fbf9f | 1212 | } |
400fbf9f | 1213 | \f |
400fbf9f JW |
1214 | /* Return either DECL or its known constant value (if it has one). */ |
1215 | ||
56cb9733 | 1216 | tree |
2f6e4e97 | 1217 | decl_constant_value (tree decl) |
400fbf9f | 1218 | { |
a7c1916a | 1219 | if (/* Don't change a variable array bound or initial value to a constant |
4f976745 RK |
1220 | in a place where a variable is invalid. Note that DECL_INITIAL |
1221 | isn't valid for a PARM_DECL. */ | |
a7c1916a | 1222 | current_function_decl != 0 |
4f976745 | 1223 | && TREE_CODE (decl) != PARM_DECL |
3f75a254 | 1224 | && !TREE_THIS_VOLATILE (decl) |
83bab8db | 1225 | && TREE_READONLY (decl) |
400fbf9f JW |
1226 | && DECL_INITIAL (decl) != 0 |
1227 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
1228 | /* This is invalid if initial value is not constant. | |
1229 | If it has either a function call, a memory reference, | |
1230 | or a variable, then re-evaluating it could give different results. */ | |
1231 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
1232 | /* Check for cases where this is sub-optimal, even though valid. */ | |
2f74f7e9 | 1233 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR) |
400fbf9f JW |
1234 | return DECL_INITIAL (decl); |
1235 | return decl; | |
1236 | } | |
1237 | ||
2f74f7e9 JM |
1238 | /* Return either DECL or its known constant value (if it has one), but |
1239 | return DECL if pedantic or DECL has mode BLKmode. This is for | |
1240 | bug-compatibility with the old behavior of decl_constant_value | |
1241 | (before GCC 3.0); every use of this function is a bug and it should | |
1242 | be removed before GCC 3.1. It is not appropriate to use pedantic | |
1243 | in a way that affects optimization, and BLKmode is probably not the | |
1244 | right test for avoiding misoptimizations either. */ | |
1245 | ||
1246 | static tree | |
2f6e4e97 | 1247 | decl_constant_value_for_broken_optimization (tree decl) |
2f74f7e9 | 1248 | { |
c477e13b JJ |
1249 | tree ret; |
1250 | ||
2f74f7e9 JM |
1251 | if (pedantic || DECL_MODE (decl) == BLKmode) |
1252 | return decl; | |
c477e13b JJ |
1253 | |
1254 | ret = decl_constant_value (decl); | |
1255 | /* Avoid unwanted tree sharing between the initializer and current | |
1256 | function's body where the tree can be modified e.g. by the | |
1257 | gimplifier. */ | |
1258 | if (ret != decl && TREE_STATIC (decl)) | |
1259 | ret = unshare_expr (ret); | |
1260 | return ret; | |
2f74f7e9 JM |
1261 | } |
1262 | ||
207bf485 JM |
1263 | |
1264 | /* Perform the default conversion of arrays and functions to pointers. | |
1265 | Return the result of converting EXP. For any other expression, just | |
1266 | return EXP. */ | |
1267 | ||
1268 | static tree | |
2f6e4e97 | 1269 | default_function_array_conversion (tree exp) |
207bf485 JM |
1270 | { |
1271 | tree orig_exp; | |
1272 | tree type = TREE_TYPE (exp); | |
1273 | enum tree_code code = TREE_CODE (type); | |
1274 | int not_lvalue = 0; | |
1275 | ||
1276 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as | |
2f6e4e97 | 1277 | an lvalue. |
207bf485 JM |
1278 | |
1279 | Do not use STRIP_NOPS here! It will remove conversions from pointer | |
1280 | to integer and cause infinite recursion. */ | |
1281 | orig_exp = exp; | |
1282 | while (TREE_CODE (exp) == NON_LVALUE_EXPR | |
1283 | || (TREE_CODE (exp) == NOP_EXPR | |
1284 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
1285 | { | |
1286 | if (TREE_CODE (exp) == NON_LVALUE_EXPR) | |
1287 | not_lvalue = 1; | |
1288 | exp = TREE_OPERAND (exp, 0); | |
1289 | } | |
1290 | ||
487a92fe JM |
1291 | if (TREE_NO_WARNING (orig_exp)) |
1292 | TREE_NO_WARNING (exp) = 1; | |
207bf485 JM |
1293 | |
1294 | if (code == FUNCTION_TYPE) | |
1295 | { | |
1296 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1297 | } | |
1298 | if (code == ARRAY_TYPE) | |
1299 | { | |
1300 | tree adr; | |
1301 | tree restype = TREE_TYPE (type); | |
1302 | tree ptrtype; | |
1303 | int constp = 0; | |
1304 | int volatilep = 0; | |
1305 | int lvalue_array_p; | |
1306 | ||
6615c446 | 1307 | if (REFERENCE_CLASS_P (exp) || DECL_P (exp)) |
207bf485 JM |
1308 | { |
1309 | constp = TREE_READONLY (exp); | |
1310 | volatilep = TREE_THIS_VOLATILE (exp); | |
1311 | } | |
1312 | ||
1313 | if (TYPE_QUALS (type) || constp || volatilep) | |
2f6e4e97 | 1314 | restype |
207bf485 | 1315 | = c_build_qualified_type (restype, |
2f6e4e97 | 1316 | TYPE_QUALS (type) |
207bf485 JM |
1317 | | (constp * TYPE_QUAL_CONST) |
1318 | | (volatilep * TYPE_QUAL_VOLATILE)); | |
1319 | ||
1320 | if (TREE_CODE (exp) == INDIRECT_REF) | |
019c8e80 | 1321 | return convert (build_pointer_type (restype), |
207bf485 JM |
1322 | TREE_OPERAND (exp, 0)); |
1323 | ||
1324 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
1325 | { | |
1326 | tree op1 = default_conversion (TREE_OPERAND (exp, 1)); | |
53fb4de3 RS |
1327 | return build2 (COMPOUND_EXPR, TREE_TYPE (op1), |
1328 | TREE_OPERAND (exp, 0), op1); | |
207bf485 JM |
1329 | } |
1330 | ||
1331 | lvalue_array_p = !not_lvalue && lvalue_p (exp); | |
db3acfa5 | 1332 | if (!flag_isoc99 && !lvalue_array_p) |
207bf485 JM |
1333 | { |
1334 | /* Before C99, non-lvalue arrays do not decay to pointers. | |
1335 | Normally, using such an array would be invalid; but it can | |
1336 | be used correctly inside sizeof or as a statement expression. | |
1337 | Thus, do not give an error here; an error will result later. */ | |
1338 | return exp; | |
1339 | } | |
1340 | ||
1341 | ptrtype = build_pointer_type (restype); | |
1342 | ||
7c672dfc AP |
1343 | if (TREE_CODE (exp) == VAR_DECL) |
1344 | { | |
1345 | /* We are making an ADDR_EXPR of ptrtype. This is a valid | |
1346 | ADDR_EXPR because it's the best way of representing what | |
1347 | happens in C when we take the address of an array and place | |
1348 | it in a pointer to the element type. */ | |
1349 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1350 | if (!c_mark_addressable (exp)) | |
1351 | return error_mark_node; | |
1352 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1353 | return adr; | |
1354 | } | |
207bf485 JM |
1355 | /* This way is better for a COMPONENT_REF since it can |
1356 | simplify the offset for a component. */ | |
7c672dfc | 1357 | adr = build_unary_op (ADDR_EXPR, exp, 1); |
207bf485 JM |
1358 | return convert (ptrtype, adr); |
1359 | } | |
1360 | return exp; | |
1361 | } | |
1362 | ||
522ddfa2 JM |
1363 | |
1364 | /* EXP is an expression of integer type. Apply the integer promotions | |
1365 | to it and return the promoted value. */ | |
400fbf9f JW |
1366 | |
1367 | tree | |
522ddfa2 | 1368 | perform_integral_promotions (tree exp) |
400fbf9f | 1369 | { |
b3694847 SS |
1370 | tree type = TREE_TYPE (exp); |
1371 | enum tree_code code = TREE_CODE (type); | |
400fbf9f | 1372 | |
522ddfa2 | 1373 | gcc_assert (INTEGRAL_TYPE_P (type)); |
157689c6 | 1374 | |
400fbf9f JW |
1375 | /* Normally convert enums to int, |
1376 | but convert wide enums to something wider. */ | |
1377 | if (code == ENUMERAL_TYPE) | |
1378 | { | |
b0c48229 NB |
1379 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
1380 | TYPE_PRECISION (integer_type_node)), | |
1381 | ((TYPE_PRECISION (type) | |
1382 | >= TYPE_PRECISION (integer_type_node)) | |
8df83eae | 1383 | && TYPE_UNSIGNED (type))); |
05bccae2 | 1384 | |
400fbf9f JW |
1385 | return convert (type, exp); |
1386 | } | |
1387 | ||
522ddfa2 JM |
1388 | /* ??? This should no longer be needed now bit-fields have their |
1389 | proper types. */ | |
9753f113 | 1390 | if (TREE_CODE (exp) == COMPONENT_REF |
05bccae2 | 1391 | && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1)) |
cff9c407 | 1392 | /* If it's thinner than an int, promote it like a |
d72040f5 | 1393 | c_promoting_integer_type_p, otherwise leave it alone. */ |
05bccae2 RK |
1394 | && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)), |
1395 | TYPE_PRECISION (integer_type_node))) | |
f458d1d5 | 1396 | return convert (integer_type_node, exp); |
9753f113 | 1397 | |
d72040f5 | 1398 | if (c_promoting_integer_type_p (type)) |
400fbf9f | 1399 | { |
f458d1d5 | 1400 | /* Preserve unsignedness if not really getting any wider. */ |
8df83eae | 1401 | if (TYPE_UNSIGNED (type) |
f458d1d5 | 1402 | && TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) |
400fbf9f | 1403 | return convert (unsigned_type_node, exp); |
05bccae2 | 1404 | |
400fbf9f JW |
1405 | return convert (integer_type_node, exp); |
1406 | } | |
05bccae2 | 1407 | |
522ddfa2 JM |
1408 | return exp; |
1409 | } | |
1410 | ||
1411 | ||
1412 | /* Perform default promotions for C data used in expressions. | |
1413 | Arrays and functions are converted to pointers; | |
1414 | enumeral types or short or char, to int. | |
1415 | In addition, manifest constants symbols are replaced by their values. */ | |
1416 | ||
1417 | tree | |
1418 | default_conversion (tree exp) | |
1419 | { | |
1420 | tree orig_exp; | |
1421 | tree type = TREE_TYPE (exp); | |
1422 | enum tree_code code = TREE_CODE (type); | |
1423 | ||
1424 | if (code == FUNCTION_TYPE || code == ARRAY_TYPE) | |
1425 | return default_function_array_conversion (exp); | |
1426 | ||
1427 | /* Constants can be used directly unless they're not loadable. */ | |
1428 | if (TREE_CODE (exp) == CONST_DECL) | |
1429 | exp = DECL_INITIAL (exp); | |
1430 | ||
1431 | /* Replace a nonvolatile const static variable with its value unless | |
1432 | it is an array, in which case we must be sure that taking the | |
1433 | address of the array produces consistent results. */ | |
1434 | else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE) | |
1435 | { | |
1436 | exp = decl_constant_value_for_broken_optimization (exp); | |
1437 | type = TREE_TYPE (exp); | |
1438 | } | |
1439 | ||
1440 | /* Strip no-op conversions. */ | |
1441 | orig_exp = exp; | |
1442 | STRIP_TYPE_NOPS (exp); | |
1443 | ||
1444 | if (TREE_NO_WARNING (orig_exp)) | |
1445 | TREE_NO_WARNING (exp) = 1; | |
1446 | ||
1447 | if (INTEGRAL_TYPE_P (type)) | |
1448 | return perform_integral_promotions (exp); | |
1449 | ||
400fbf9f JW |
1450 | if (code == VOID_TYPE) |
1451 | { | |
1452 | error ("void value not ignored as it ought to be"); | |
1453 | return error_mark_node; | |
1454 | } | |
400fbf9f JW |
1455 | return exp; |
1456 | } | |
1457 | \f | |
e9b2c823 NB |
1458 | /* Look up COMPONENT in a structure or union DECL. |
1459 | ||
1460 | If the component name is not found, returns NULL_TREE. Otherwise, | |
1461 | the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL | |
1462 | stepping down the chain to the component, which is in the last | |
1463 | TREE_VALUE of the list. Normally the list is of length one, but if | |
1464 | the component is embedded within (nested) anonymous structures or | |
1465 | unions, the list steps down the chain to the component. */ | |
2f6e4e97 | 1466 | |
2f2d13da | 1467 | static tree |
2f6e4e97 | 1468 | lookup_field (tree decl, tree component) |
2f2d13da | 1469 | { |
e9b2c823 | 1470 | tree type = TREE_TYPE (decl); |
2f2d13da DE |
1471 | tree field; |
1472 | ||
1473 | /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1474 | to the field elements. Use a binary search on this array to quickly | |
1475 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1476 | will always be set for structures which have many elements. */ | |
1477 | ||
22a0b85f | 1478 | if (TYPE_LANG_SPECIFIC (type) && TYPE_LANG_SPECIFIC (type)->s) |
2f2d13da DE |
1479 | { |
1480 | int bot, top, half; | |
d07605f5 | 1481 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->s->elts[0]; |
2f2d13da DE |
1482 | |
1483 | field = TYPE_FIELDS (type); | |
1484 | bot = 0; | |
d07605f5 | 1485 | top = TYPE_LANG_SPECIFIC (type)->s->len; |
2f2d13da DE |
1486 | while (top - bot > 1) |
1487 | { | |
2f2d13da DE |
1488 | half = (top - bot + 1) >> 1; |
1489 | field = field_array[bot+half]; | |
1490 | ||
1491 | if (DECL_NAME (field) == NULL_TREE) | |
1492 | { | |
1493 | /* Step through all anon unions in linear fashion. */ | |
1494 | while (DECL_NAME (field_array[bot]) == NULL_TREE) | |
1495 | { | |
2f2d13da | 1496 | field = field_array[bot++]; |
a68b98cf RK |
1497 | if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
1498 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
19d76e60 | 1499 | { |
e9b2c823 NB |
1500 | tree anon = lookup_field (field, component); |
1501 | ||
1502 | if (anon) | |
1503 | return tree_cons (NULL_TREE, field, anon); | |
2f6e4e97 | 1504 | } |
2f2d13da DE |
1505 | } |
1506 | ||
1507 | /* Entire record is only anon unions. */ | |
1508 | if (bot > top) | |
1509 | return NULL_TREE; | |
1510 | ||
1511 | /* Restart the binary search, with new lower bound. */ | |
1512 | continue; | |
1513 | } | |
1514 | ||
e8b87aac | 1515 | if (DECL_NAME (field) == component) |
2f2d13da | 1516 | break; |
e8b87aac | 1517 | if (DECL_NAME (field) < component) |
2f2d13da DE |
1518 | bot += half; |
1519 | else | |
1520 | top = bot + half; | |
1521 | } | |
1522 | ||
1523 | if (DECL_NAME (field_array[bot]) == component) | |
1524 | field = field_array[bot]; | |
1525 | else if (DECL_NAME (field) != component) | |
e9b2c823 | 1526 | return NULL_TREE; |
2f2d13da DE |
1527 | } |
1528 | else | |
1529 | { | |
1530 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1531 | { | |
e9b2c823 NB |
1532 | if (DECL_NAME (field) == NULL_TREE |
1533 | && (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
1534 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)) | |
2f2d13da | 1535 | { |
e9b2c823 | 1536 | tree anon = lookup_field (field, component); |
a68b98cf | 1537 | |
e9b2c823 NB |
1538 | if (anon) |
1539 | return tree_cons (NULL_TREE, field, anon); | |
2f2d13da DE |
1540 | } |
1541 | ||
1542 | if (DECL_NAME (field) == component) | |
1543 | break; | |
1544 | } | |
e9b2c823 NB |
1545 | |
1546 | if (field == NULL_TREE) | |
1547 | return NULL_TREE; | |
2f2d13da DE |
1548 | } |
1549 | ||
e9b2c823 | 1550 | return tree_cons (NULL_TREE, field, NULL_TREE); |
2f2d13da DE |
1551 | } |
1552 | ||
400fbf9f JW |
1553 | /* Make an expression to refer to the COMPONENT field of |
1554 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1555 | ||
1556 | tree | |
2f6e4e97 | 1557 | build_component_ref (tree datum, tree component) |
400fbf9f | 1558 | { |
b3694847 SS |
1559 | tree type = TREE_TYPE (datum); |
1560 | enum tree_code code = TREE_CODE (type); | |
1561 | tree field = NULL; | |
1562 | tree ref; | |
400fbf9f | 1563 | |
7a3ea201 RH |
1564 | if (!objc_is_public (datum, component)) |
1565 | return error_mark_node; | |
1566 | ||
400fbf9f JW |
1567 | /* See if there is a field or component with name COMPONENT. */ |
1568 | ||
1569 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1570 | { | |
d0f062fb | 1571 | if (!COMPLETE_TYPE_P (type)) |
400fbf9f | 1572 | { |
7a228918 | 1573 | c_incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1574 | return error_mark_node; |
1575 | } | |
1576 | ||
e9b2c823 | 1577 | field = lookup_field (datum, component); |
400fbf9f JW |
1578 | |
1579 | if (!field) | |
1580 | { | |
c51a1ba9 | 1581 | error ("%qT has no member named %qE", type, component); |
400fbf9f JW |
1582 | return error_mark_node; |
1583 | } | |
400fbf9f | 1584 | |
e9b2c823 NB |
1585 | /* Chain the COMPONENT_REFs if necessary down to the FIELD. |
1586 | This might be better solved in future the way the C++ front | |
1587 | end does it - by giving the anonymous entities each a | |
1588 | separate name and type, and then have build_component_ref | |
1589 | recursively call itself. We can't do that here. */ | |
46ea50cb | 1590 | do |
19d76e60 | 1591 | { |
e9b2c823 NB |
1592 | tree subdatum = TREE_VALUE (field); |
1593 | ||
1594 | if (TREE_TYPE (subdatum) == error_mark_node) | |
1595 | return error_mark_node; | |
1596 | ||
53fb4de3 RS |
1597 | ref = build3 (COMPONENT_REF, TREE_TYPE (subdatum), datum, subdatum, |
1598 | NULL_TREE); | |
e9b2c823 | 1599 | if (TREE_READONLY (datum) || TREE_READONLY (subdatum)) |
19d76e60 | 1600 | TREE_READONLY (ref) = 1; |
e9b2c823 | 1601 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (subdatum)) |
19d76e60 | 1602 | TREE_THIS_VOLATILE (ref) = 1; |
e23bd218 IR |
1603 | |
1604 | if (TREE_DEPRECATED (subdatum)) | |
1605 | warn_deprecated_use (subdatum); | |
1606 | ||
19d76e60 | 1607 | datum = ref; |
46ea50cb RS |
1608 | |
1609 | field = TREE_CHAIN (field); | |
19d76e60 | 1610 | } |
46ea50cb | 1611 | while (field); |
19d76e60 | 1612 | |
400fbf9f JW |
1613 | return ref; |
1614 | } | |
1615 | else if (code != ERROR_MARK) | |
c51a1ba9 JM |
1616 | error ("request for member %qE in something not a structure or union", |
1617 | component); | |
400fbf9f JW |
1618 | |
1619 | return error_mark_node; | |
1620 | } | |
1621 | \f | |
1622 | /* Given an expression PTR for a pointer, return an expression | |
1623 | for the value pointed to. | |
1624 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1625 | ||
1626 | tree | |
2f6e4e97 | 1627 | build_indirect_ref (tree ptr, const char *errorstring) |
400fbf9f | 1628 | { |
b3694847 SS |
1629 | tree pointer = default_conversion (ptr); |
1630 | tree type = TREE_TYPE (pointer); | |
400fbf9f JW |
1631 | |
1632 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b RS |
1633 | { |
1634 | if (TREE_CODE (pointer) == ADDR_EXPR | |
870cc33b RS |
1635 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) |
1636 | == TREE_TYPE (type))) | |
1637 | return TREE_OPERAND (pointer, 0); | |
1638 | else | |
1639 | { | |
1640 | tree t = TREE_TYPE (type); | |
46df2823 JM |
1641 | tree ref; |
1642 | ||
984dfd8c | 1643 | ref = build1 (INDIRECT_REF, t, pointer); |
400fbf9f | 1644 | |
baae9b65 | 1645 | if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE) |
870cc33b RS |
1646 | { |
1647 | error ("dereferencing pointer to incomplete type"); | |
1648 | return error_mark_node; | |
1649 | } | |
baae9b65 | 1650 | if (VOID_TYPE_P (t) && skip_evaluation == 0) |
d4ee4d25 | 1651 | warning (0, "dereferencing %<void *%> pointer"); |
870cc33b RS |
1652 | |
1653 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
1654 | so that we get the proper error message if the result is used | |
1655 | to assign to. Also, &* is supposed to be a no-op. | |
1656 | And ANSI C seems to specify that the type of the result | |
1657 | should be the const type. */ | |
1658 | /* A de-reference of a pointer to const is not a const. It is valid | |
1659 | to change it via some other pointer. */ | |
1660 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
1661 | TREE_SIDE_EFFECTS (ref) | |
271bd540 | 1662 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); |
493692cd | 1663 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); |
870cc33b RS |
1664 | return ref; |
1665 | } | |
1666 | } | |
400fbf9f | 1667 | else if (TREE_CODE (pointer) != ERROR_MARK) |
bda67431 | 1668 | error ("invalid type argument of %qs", errorstring); |
400fbf9f JW |
1669 | return error_mark_node; |
1670 | } | |
1671 | ||
1672 | /* This handles expressions of the form "a[i]", which denotes | |
1673 | an array reference. | |
1674 | ||
1675 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
1676 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
1677 | This avoids forcing the array out of registers, and can work on | |
1678 | arrays that are not lvalues (for example, members of structures returned | |
1679 | by functions). */ | |
1680 | ||
1681 | tree | |
2f6e4e97 | 1682 | build_array_ref (tree array, tree index) |
400fbf9f | 1683 | { |
a4ab7973 | 1684 | bool swapped = false; |
400fbf9f JW |
1685 | if (TREE_TYPE (array) == error_mark_node |
1686 | || TREE_TYPE (index) == error_mark_node) | |
1687 | return error_mark_node; | |
1688 | ||
a4ab7973 JM |
1689 | if (TREE_CODE (TREE_TYPE (array)) != ARRAY_TYPE |
1690 | && TREE_CODE (TREE_TYPE (array)) != POINTER_TYPE) | |
400fbf9f | 1691 | { |
a4ab7973 JM |
1692 | tree temp; |
1693 | if (TREE_CODE (TREE_TYPE (index)) != ARRAY_TYPE | |
1694 | && TREE_CODE (TREE_TYPE (index)) != POINTER_TYPE) | |
fdeefd49 | 1695 | { |
a4ab7973 | 1696 | error ("subscripted value is neither array nor pointer"); |
fdeefd49 RS |
1697 | return error_mark_node; |
1698 | } | |
a4ab7973 JM |
1699 | temp = array; |
1700 | array = index; | |
1701 | index = temp; | |
1702 | swapped = true; | |
1703 | } | |
1704 | ||
1705 | if (!INTEGRAL_TYPE_P (TREE_TYPE (index))) | |
1706 | { | |
1707 | error ("array subscript is not an integer"); | |
1708 | return error_mark_node; | |
1709 | } | |
1710 | ||
1711 | if (TREE_CODE (TREE_TYPE (TREE_TYPE (array))) == FUNCTION_TYPE) | |
1712 | { | |
1713 | error ("subscripted value is pointer to function"); | |
1714 | return error_mark_node; | |
1715 | } | |
1716 | ||
1717 | /* Subscripting with type char is likely to lose on a machine where | |
1718 | chars are signed. So warn on any machine, but optionally. Don't | |
1719 | warn for unsigned char since that type is safe. Don't warn for | |
1720 | signed char because anyone who uses that must have done so | |
1721 | deliberately. ??? Existing practice has also been to warn only | |
1722 | when the char index is syntactically the index, not for | |
1723 | char[array]. */ | |
1724 | if (warn_char_subscripts && !swapped | |
1725 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
d4ee4d25 | 1726 | warning (0, "array subscript has type %<char%>"); |
a4ab7973 JM |
1727 | |
1728 | /* Apply default promotions *after* noticing character types. */ | |
1729 | index = default_conversion (index); | |
1730 | ||
1731 | gcc_assert (TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE); | |
1732 | ||
1733 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE) | |
1734 | { | |
1735 | tree rval, type; | |
fdeefd49 | 1736 | |
400fbf9f JW |
1737 | /* An array that is indexed by a non-constant |
1738 | cannot be stored in a register; we must be able to do | |
1739 | address arithmetic on its address. | |
1740 | Likewise an array of elements of variable size. */ | |
1741 | if (TREE_CODE (index) != INTEGER_CST | |
d0f062fb | 1742 | || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array))) |
400fbf9f JW |
1743 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) |
1744 | { | |
dffd7eb6 | 1745 | if (!c_mark_addressable (array)) |
400fbf9f JW |
1746 | return error_mark_node; |
1747 | } | |
e6d52559 JW |
1748 | /* An array that is indexed by a constant value which is not within |
1749 | the array bounds cannot be stored in a register either; because we | |
1750 | would get a crash in store_bit_field/extract_bit_field when trying | |
1751 | to access a non-existent part of the register. */ | |
1752 | if (TREE_CODE (index) == INTEGER_CST | |
eb34af89 | 1753 | && TYPE_DOMAIN (TREE_TYPE (array)) |
3f75a254 | 1754 | && !int_fits_type_p (index, TYPE_DOMAIN (TREE_TYPE (array)))) |
e6d52559 | 1755 | { |
dffd7eb6 | 1756 | if (!c_mark_addressable (array)) |
e6d52559 JW |
1757 | return error_mark_node; |
1758 | } | |
400fbf9f | 1759 | |
400fbf9f JW |
1760 | if (pedantic) |
1761 | { | |
1762 | tree foo = array; | |
1763 | while (TREE_CODE (foo) == COMPONENT_REF) | |
1764 | foo = TREE_OPERAND (foo, 0); | |
5baeaac0 | 1765 | if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo)) |
bda67431 | 1766 | pedwarn ("ISO C forbids subscripting %<register%> array"); |
3f75a254 | 1767 | else if (!flag_isoc99 && !lvalue_p (foo)) |
56508306 | 1768 | pedwarn ("ISO C90 forbids subscripting non-lvalue array"); |
400fbf9f JW |
1769 | } |
1770 | ||
46df2823 JM |
1771 | type = TREE_TYPE (TREE_TYPE (array)); |
1772 | if (TREE_CODE (type) != ARRAY_TYPE) | |
1773 | type = TYPE_MAIN_VARIANT (type); | |
53fb4de3 | 1774 | rval = build4 (ARRAY_REF, type, array, index, NULL_TREE, NULL_TREE); |
400fbf9f JW |
1775 | /* Array ref is const/volatile if the array elements are |
1776 | or if the array is. */ | |
1777 | TREE_READONLY (rval) | |
1778 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
1779 | | TREE_READONLY (array)); | |
1780 | TREE_SIDE_EFFECTS (rval) | |
1781 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1782 | | TREE_SIDE_EFFECTS (array)); | |
1783 | TREE_THIS_VOLATILE (rval) | |
1784 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1785 | /* This was added by rms on 16 Nov 91. | |
2f6e4e97 | 1786 | It fixes vol struct foo *a; a->elts[1] |
400fbf9f JW |
1787 | in an inline function. |
1788 | Hope it doesn't break something else. */ | |
1789 | | TREE_THIS_VOLATILE (array)); | |
1790 | return require_complete_type (fold (rval)); | |
1791 | } | |
a4ab7973 JM |
1792 | else |
1793 | { | |
1794 | tree ar = default_conversion (array); | |
400fbf9f | 1795 | |
a4ab7973 JM |
1796 | if (ar == error_mark_node) |
1797 | return ar; | |
400fbf9f | 1798 | |
a4ab7973 JM |
1799 | gcc_assert (TREE_CODE (TREE_TYPE (ar)) == POINTER_TYPE); |
1800 | gcc_assert (TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) != FUNCTION_TYPE); | |
400fbf9f | 1801 | |
a4ab7973 JM |
1802 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, index, 0), |
1803 | "array indexing"); | |
1804 | } | |
400fbf9f JW |
1805 | } |
1806 | \f | |
7e585d16 | 1807 | /* Build an external reference to identifier ID. FUN indicates |
766beb40 JM |
1808 | whether this will be used for a function call. LOC is the source |
1809 | location of the identifier. */ | |
7e585d16 | 1810 | tree |
766beb40 | 1811 | build_external_ref (tree id, int fun, location_t loc) |
7e585d16 ZW |
1812 | { |
1813 | tree ref; | |
1814 | tree decl = lookup_name (id); | |
16b34ad6 ZL |
1815 | |
1816 | /* In Objective-C, an instance variable (ivar) may be preferred to | |
1817 | whatever lookup_name() found. */ | |
1818 | decl = objc_lookup_ivar (decl, id); | |
7e585d16 | 1819 | |
339a28b9 | 1820 | if (decl && decl != error_mark_node) |
16b34ad6 | 1821 | ref = decl; |
339a28b9 ZW |
1822 | else if (fun) |
1823 | /* Implicit function declaration. */ | |
1824 | ref = implicitly_declare (id); | |
1825 | else if (decl == error_mark_node) | |
1826 | /* Don't complain about something that's already been | |
1827 | complained about. */ | |
1828 | return error_mark_node; | |
1829 | else | |
1830 | { | |
766beb40 | 1831 | undeclared_variable (id, loc); |
339a28b9 ZW |
1832 | return error_mark_node; |
1833 | } | |
7e585d16 ZW |
1834 | |
1835 | if (TREE_TYPE (ref) == error_mark_node) | |
1836 | return error_mark_node; | |
1837 | ||
339a28b9 ZW |
1838 | if (TREE_DEPRECATED (ref)) |
1839 | warn_deprecated_use (ref); | |
1840 | ||
25587e40 AO |
1841 | if (!skip_evaluation) |
1842 | assemble_external (ref); | |
7e585d16 ZW |
1843 | TREE_USED (ref) = 1; |
1844 | ||
bc4b653b JM |
1845 | if (TREE_CODE (ref) == FUNCTION_DECL && !in_alignof) |
1846 | { | |
1847 | if (!in_sizeof && !in_typeof) | |
1848 | C_DECL_USED (ref) = 1; | |
1849 | else if (DECL_INITIAL (ref) == 0 | |
1850 | && DECL_EXTERNAL (ref) | |
1851 | && !TREE_PUBLIC (ref)) | |
1852 | record_maybe_used_decl (ref); | |
1853 | } | |
1854 | ||
7e585d16 ZW |
1855 | if (TREE_CODE (ref) == CONST_DECL) |
1856 | { | |
1857 | ref = DECL_INITIAL (ref); | |
1858 | TREE_CONSTANT (ref) = 1; | |
6de9cd9a | 1859 | TREE_INVARIANT (ref) = 1; |
7e585d16 | 1860 | } |
6a29edea | 1861 | else if (current_function_decl != 0 |
4b1e44be | 1862 | && !DECL_FILE_SCOPE_P (current_function_decl) |
6a29edea EB |
1863 | && (TREE_CODE (ref) == VAR_DECL |
1864 | || TREE_CODE (ref) == PARM_DECL | |
1865 | || TREE_CODE (ref) == FUNCTION_DECL)) | |
1866 | { | |
1867 | tree context = decl_function_context (ref); | |
2f6e4e97 | 1868 | |
6a29edea EB |
1869 | if (context != 0 && context != current_function_decl) |
1870 | DECL_NONLOCAL (ref) = 1; | |
1871 | } | |
7e585d16 ZW |
1872 | |
1873 | return ref; | |
1874 | } | |
1875 | ||
bc4b653b JM |
1876 | /* Record details of decls possibly used inside sizeof or typeof. */ |
1877 | struct maybe_used_decl | |
1878 | { | |
1879 | /* The decl. */ | |
1880 | tree decl; | |
1881 | /* The level seen at (in_sizeof + in_typeof). */ | |
1882 | int level; | |
1883 | /* The next one at this level or above, or NULL. */ | |
1884 | struct maybe_used_decl *next; | |
1885 | }; | |
1886 | ||
1887 | static struct maybe_used_decl *maybe_used_decls; | |
1888 | ||
1889 | /* Record that DECL, an undefined static function reference seen | |
1890 | inside sizeof or typeof, might be used if the operand of sizeof is | |
1891 | a VLA type or the operand of typeof is a variably modified | |
1892 | type. */ | |
1893 | ||
4e2fb7de | 1894 | static void |
bc4b653b JM |
1895 | record_maybe_used_decl (tree decl) |
1896 | { | |
1897 | struct maybe_used_decl *t = XOBNEW (&parser_obstack, struct maybe_used_decl); | |
1898 | t->decl = decl; | |
1899 | t->level = in_sizeof + in_typeof; | |
1900 | t->next = maybe_used_decls; | |
1901 | maybe_used_decls = t; | |
1902 | } | |
1903 | ||
1904 | /* Pop the stack of decls possibly used inside sizeof or typeof. If | |
1905 | USED is false, just discard them. If it is true, mark them used | |
1906 | (if no longer inside sizeof or typeof) or move them to the next | |
1907 | level up (if still inside sizeof or typeof). */ | |
1908 | ||
1909 | void | |
1910 | pop_maybe_used (bool used) | |
1911 | { | |
1912 | struct maybe_used_decl *p = maybe_used_decls; | |
1913 | int cur_level = in_sizeof + in_typeof; | |
1914 | while (p && p->level > cur_level) | |
1915 | { | |
1916 | if (used) | |
1917 | { | |
1918 | if (cur_level == 0) | |
1919 | C_DECL_USED (p->decl) = 1; | |
1920 | else | |
1921 | p->level = cur_level; | |
1922 | } | |
1923 | p = p->next; | |
1924 | } | |
1925 | if (!used || cur_level == 0) | |
1926 | maybe_used_decls = p; | |
1927 | } | |
1928 | ||
1929 | /* Return the result of sizeof applied to EXPR. */ | |
1930 | ||
1931 | struct c_expr | |
1932 | c_expr_sizeof_expr (struct c_expr expr) | |
1933 | { | |
1934 | struct c_expr ret; | |
ad97f4be JM |
1935 | if (expr.value == error_mark_node) |
1936 | { | |
1937 | ret.value = error_mark_node; | |
1938 | ret.original_code = ERROR_MARK; | |
1939 | pop_maybe_used (false); | |
1940 | } | |
1941 | else | |
1942 | { | |
1943 | ret.value = c_sizeof (TREE_TYPE (expr.value)); | |
1944 | ret.original_code = ERROR_MARK; | |
1945 | pop_maybe_used (C_TYPE_VARIABLE_SIZE (TREE_TYPE (expr.value))); | |
1946 | } | |
bc4b653b JM |
1947 | return ret; |
1948 | } | |
1949 | ||
1950 | /* Return the result of sizeof applied to T, a structure for the type | |
1951 | name passed to sizeof (rather than the type itself). */ | |
1952 | ||
1953 | struct c_expr | |
f8893e47 | 1954 | c_expr_sizeof_type (struct c_type_name *t) |
bc4b653b JM |
1955 | { |
1956 | tree type; | |
1957 | struct c_expr ret; | |
1958 | type = groktypename (t); | |
1959 | ret.value = c_sizeof (type); | |
1960 | ret.original_code = ERROR_MARK; | |
1961 | pop_maybe_used (C_TYPE_VARIABLE_SIZE (type)); | |
1962 | return ret; | |
1963 | } | |
1964 | ||
400fbf9f JW |
1965 | /* Build a function call to function FUNCTION with parameters PARAMS. |
1966 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
1967 | TREE_VALUE of each node is a parameter-expression. | |
1968 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
1969 | ||
1970 | tree | |
2f6e4e97 | 1971 | build_function_call (tree function, tree params) |
400fbf9f | 1972 | { |
b3694847 SS |
1973 | tree fntype, fundecl = 0; |
1974 | tree coerced_params; | |
4977bab6 | 1975 | tree name = NULL_TREE, result; |
c96f4f73 | 1976 | tree tem; |
400fbf9f | 1977 | |
fc76e425 | 1978 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 1979 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
1980 | |
1981 | /* Convert anything with function type to a pointer-to-function. */ | |
1982 | if (TREE_CODE (function) == FUNCTION_DECL) | |
1983 | { | |
58646b77 PB |
1984 | /* Implement type-directed function overloading for builtins. |
1985 | resolve_overloaded_builtin and targetm.resolve_overloaded_builtin | |
1986 | handle all the type checking. The result is a complete expression | |
1987 | that implements this function call. */ | |
1988 | tem = resolve_overloaded_builtin (function, params); | |
1989 | if (tem) | |
1990 | return tem; | |
48ae6c13 | 1991 | |
400fbf9f | 1992 | name = DECL_NAME (function); |
19d76e60 | 1993 | |
400fbf9f JW |
1994 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
1995 | (because calling an inline function does not mean the function | |
1996 | needs to be separately compiled). */ | |
1997 | fntype = build_type_variant (TREE_TYPE (function), | |
1998 | TREE_READONLY (function), | |
1999 | TREE_THIS_VOLATILE (function)); | |
9b7267b8 | 2000 | fundecl = function; |
400fbf9f JW |
2001 | function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); |
2002 | } | |
2003 | else | |
2004 | function = default_conversion (function); | |
2005 | ||
6e955430 ZL |
2006 | /* For Objective-C, convert any calls via a cast to OBJC_TYPE_REF |
2007 | expressions, like those used for ObjC messenger dispatches. */ | |
2008 | function = objc_rewrite_function_call (function, params); | |
2009 | ||
400fbf9f JW |
2010 | fntype = TREE_TYPE (function); |
2011 | ||
2012 | if (TREE_CODE (fntype) == ERROR_MARK) | |
2013 | return error_mark_node; | |
2014 | ||
2015 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
2016 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
2017 | { | |
f0c721ad | 2018 | error ("called object %qE is not a function", function); |
400fbf9f JW |
2019 | return error_mark_node; |
2020 | } | |
2021 | ||
5ce89b2e JM |
2022 | if (fundecl && TREE_THIS_VOLATILE (fundecl)) |
2023 | current_function_returns_abnormally = 1; | |
2024 | ||
400fbf9f JW |
2025 | /* fntype now gets the type of function pointed to. */ |
2026 | fntype = TREE_TYPE (fntype); | |
2027 | ||
c96f4f73 EB |
2028 | /* Check that the function is called through a compatible prototype. |
2029 | If it is not, replace the call by a trap, wrapped up in a compound | |
2030 | expression if necessary. This has the nice side-effect to prevent | |
2031 | the tree-inliner from generating invalid assignment trees which may | |
58393038 ZL |
2032 | blow up in the RTL expander later. */ |
2033 | if (TREE_CODE (function) == NOP_EXPR | |
c96f4f73 EB |
2034 | && TREE_CODE (tem = TREE_OPERAND (function, 0)) == ADDR_EXPR |
2035 | && TREE_CODE (tem = TREE_OPERAND (tem, 0)) == FUNCTION_DECL | |
3f75a254 | 2036 | && !comptypes (fntype, TREE_TYPE (tem))) |
c96f4f73 EB |
2037 | { |
2038 | tree return_type = TREE_TYPE (fntype); | |
2039 | tree trap = build_function_call (built_in_decls[BUILT_IN_TRAP], | |
2040 | NULL_TREE); | |
2041 | ||
2042 | /* This situation leads to run-time undefined behavior. We can't, | |
2043 | therefore, simply error unless we can prove that all possible | |
2044 | executions of the program must execute the code. */ | |
d4ee4d25 | 2045 | warning (0, "function called through a non-compatible type"); |
c96f4f73 | 2046 | |
bba745c1 EB |
2047 | /* We can, however, treat "undefined" any way we please. |
2048 | Call abort to encourage the user to fix the program. */ | |
2049 | inform ("if this code is reached, the program will abort"); | |
2050 | ||
c96f4f73 EB |
2051 | if (VOID_TYPE_P (return_type)) |
2052 | return trap; | |
2053 | else | |
2054 | { | |
2055 | tree rhs; | |
2056 | ||
2057 | if (AGGREGATE_TYPE_P (return_type)) | |
2058 | rhs = build_compound_literal (return_type, | |
2059 | build_constructor (return_type, | |
2060 | NULL_TREE)); | |
2061 | else | |
2062 | rhs = fold (build1 (NOP_EXPR, return_type, integer_zero_node)); | |
2063 | ||
53fb4de3 | 2064 | return build2 (COMPOUND_EXPR, return_type, trap, rhs); |
c96f4f73 EB |
2065 | } |
2066 | } | |
2067 | ||
400fbf9f JW |
2068 | /* Convert the parameters to the types declared in the |
2069 | function prototype, or apply default promotions. */ | |
2070 | ||
2071 | coerced_params | |
03dafa61 | 2072 | = convert_arguments (TYPE_ARG_TYPES (fntype), params, function, fundecl); |
400fbf9f | 2073 | |
3789b316 JM |
2074 | if (coerced_params == error_mark_node) |
2075 | return error_mark_node; | |
2076 | ||
b34c7881 | 2077 | /* Check that the arguments to the function are valid. */ |
400fbf9f | 2078 | |
b34c7881 | 2079 | check_function_arguments (TYPE_ATTRIBUTES (fntype), coerced_params); |
400fbf9f | 2080 | |
53fb4de3 RS |
2081 | result = build3 (CALL_EXPR, TREE_TYPE (fntype), |
2082 | function, coerced_params, NULL_TREE); | |
1eb8759b | 2083 | TREE_SIDE_EFFECTS (result) = 1; |
bf730f15 RS |
2084 | |
2085 | if (require_constant_value) | |
2086 | { | |
2087 | result = fold_initializer (result); | |
2088 | ||
2089 | if (TREE_CONSTANT (result) | |
2090 | && (name == NULL_TREE | |
2091 | || strncmp (IDENTIFIER_POINTER (name), "__builtin_", 10) != 0)) | |
2092 | pedwarn_init ("initializer element is not constant"); | |
2093 | } | |
2094 | else | |
2095 | result = fold (result); | |
b0b3afb2 | 2096 | |
71653180 | 2097 | if (VOID_TYPE_P (TREE_TYPE (result))) |
1eb8759b RH |
2098 | return result; |
2099 | return require_complete_type (result); | |
400fbf9f JW |
2100 | } |
2101 | \f | |
2102 | /* Convert the argument expressions in the list VALUES | |
2103 | to the types in the list TYPELIST. The result is a list of converted | |
3789b316 JM |
2104 | argument expressions, unless there are too few arguments in which |
2105 | case it is error_mark_node. | |
400fbf9f JW |
2106 | |
2107 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
2108 | perform the default conversions. | |
2109 | ||
2110 | PARMLIST is the chain of parm decls for the function being called. | |
2111 | It may be 0, if that info is not available. | |
2112 | It is used only for generating error messages. | |
2113 | ||
03dafa61 JM |
2114 | FUNCTION is a tree for the called function. It is used only for |
2115 | error messages, where it is formatted with %qE. | |
400fbf9f JW |
2116 | |
2117 | This is also where warnings about wrong number of args are generated. | |
2118 | ||
2119 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
2120 | with the elements of the list in the TREE_VALUE slots of those nodes. */ | |
2121 | ||
2122 | static tree | |
03dafa61 | 2123 | convert_arguments (tree typelist, tree values, tree function, tree fundecl) |
400fbf9f | 2124 | { |
b3694847 SS |
2125 | tree typetail, valtail; |
2126 | tree result = NULL; | |
400fbf9f | 2127 | int parmnum; |
03dafa61 | 2128 | tree selector; |
03dafa61 | 2129 | |
2ac2f164 JM |
2130 | /* Change pointer to function to the function itself for |
2131 | diagnostics. */ | |
03dafa61 JM |
2132 | if (TREE_CODE (function) == ADDR_EXPR |
2133 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL) | |
2ac2f164 | 2134 | function = TREE_OPERAND (function, 0); |
03dafa61 JM |
2135 | |
2136 | /* Handle an ObjC selector specially for diagnostics. */ | |
2137 | selector = objc_message_selector (); | |
400fbf9f JW |
2138 | |
2139 | /* Scan the given expressions and types, producing individual | |
2140 | converted arguments and pushing them on RESULT in reverse order. */ | |
2141 | ||
2142 | for (valtail = values, typetail = typelist, parmnum = 0; | |
2143 | valtail; | |
2144 | valtail = TREE_CHAIN (valtail), parmnum++) | |
2145 | { | |
b3694847 SS |
2146 | tree type = typetail ? TREE_VALUE (typetail) : 0; |
2147 | tree val = TREE_VALUE (valtail); | |
03dafa61 JM |
2148 | tree rname = function; |
2149 | int argnum = parmnum + 1; | |
4d3e6fae | 2150 | const char *invalid_func_diag; |
400fbf9f JW |
2151 | |
2152 | if (type == void_type_node) | |
2153 | { | |
03dafa61 | 2154 | error ("too many arguments to function %qE", function); |
400fbf9f JW |
2155 | break; |
2156 | } | |
2157 | ||
03dafa61 JM |
2158 | if (selector && argnum > 2) |
2159 | { | |
2160 | rname = selector; | |
2161 | argnum -= 2; | |
2162 | } | |
2163 | ||
ed248cf7 | 2164 | STRIP_TYPE_NOPS (val); |
400fbf9f | 2165 | |
207bf485 | 2166 | val = default_function_array_conversion (val); |
400fbf9f JW |
2167 | |
2168 | val = require_complete_type (val); | |
2169 | ||
2170 | if (type != 0) | |
2171 | { | |
2172 | /* Formal parm type is specified by a function prototype. */ | |
2173 | tree parmval; | |
2174 | ||
20913689 | 2175 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
400fbf9f JW |
2176 | { |
2177 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
2178 | parmval = val; | |
2179 | } | |
2180 | else | |
2181 | { | |
d45cf215 RS |
2182 | /* Optionally warn about conversions that |
2183 | differ from the default conversions. */ | |
03829ad2 | 2184 | if (warn_conversion || warn_traditional) |
400fbf9f | 2185 | { |
e3a64162 | 2186 | unsigned int formal_prec = TYPE_PRECISION (type); |
400fbf9f | 2187 | |
aae43c5f | 2188 | if (INTEGRAL_TYPE_P (type) |
400fbf9f | 2189 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) |
d4ee4d25 | 2190 | warning (0, "passing argument %d of %qE as integer " |
03dafa61 JM |
2191 | "rather than floating due to prototype", |
2192 | argnum, rname); | |
03829ad2 KG |
2193 | if (INTEGRAL_TYPE_P (type) |
2194 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
d4ee4d25 | 2195 | warning (0, "passing argument %d of %qE as integer " |
03dafa61 JM |
2196 | "rather than complex due to prototype", |
2197 | argnum, rname); | |
aae43c5f RK |
2198 | else if (TREE_CODE (type) == COMPLEX_TYPE |
2199 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
d4ee4d25 | 2200 | warning (0, "passing argument %d of %qE as complex " |
03dafa61 JM |
2201 | "rather than floating due to prototype", |
2202 | argnum, rname); | |
400fbf9f | 2203 | else if (TREE_CODE (type) == REAL_TYPE |
aae43c5f | 2204 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
d4ee4d25 | 2205 | warning (0, "passing argument %d of %qE as floating " |
03dafa61 JM |
2206 | "rather than integer due to prototype", |
2207 | argnum, rname); | |
03829ad2 KG |
2208 | else if (TREE_CODE (type) == COMPLEX_TYPE |
2209 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) | |
d4ee4d25 | 2210 | warning (0, "passing argument %d of %qE as complex " |
03dafa61 JM |
2211 | "rather than integer due to prototype", |
2212 | argnum, rname); | |
aae43c5f RK |
2213 | else if (TREE_CODE (type) == REAL_TYPE |
2214 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
d4ee4d25 | 2215 | warning (0, "passing argument %d of %qE as floating " |
03dafa61 JM |
2216 | "rather than complex due to prototype", |
2217 | argnum, rname); | |
aae43c5f RK |
2218 | /* ??? At some point, messages should be written about |
2219 | conversions between complex types, but that's too messy | |
2220 | to do now. */ | |
d45cf215 RS |
2221 | else if (TREE_CODE (type) == REAL_TYPE |
2222 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
2223 | { | |
2224 | /* Warn if any argument is passed as `float', | |
047de90b | 2225 | since without a prototype it would be `double'. */ |
d45cf215 | 2226 | if (formal_prec == TYPE_PRECISION (float_type_node)) |
d4ee4d25 | 2227 | warning (0, "passing argument %d of %qE as %<float%> " |
03dafa61 JM |
2228 | "rather than %<double%> due to prototype", |
2229 | argnum, rname); | |
d45cf215 | 2230 | } |
3ed56f8a KG |
2231 | /* Detect integer changing in width or signedness. |
2232 | These warnings are only activated with | |
2233 | -Wconversion, not with -Wtraditional. */ | |
2234 | else if (warn_conversion && INTEGRAL_TYPE_P (type) | |
aae43c5f | 2235 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
400fbf9f | 2236 | { |
d45cf215 RS |
2237 | tree would_have_been = default_conversion (val); |
2238 | tree type1 = TREE_TYPE (would_have_been); | |
2239 | ||
754a4d82 | 2240 | if (TREE_CODE (type) == ENUMERAL_TYPE |
a38b987a NB |
2241 | && (TYPE_MAIN_VARIANT (type) |
2242 | == TYPE_MAIN_VARIANT (TREE_TYPE (val)))) | |
754a4d82 RS |
2243 | /* No warning if function asks for enum |
2244 | and the actual arg is that enum type. */ | |
2245 | ; | |
2246 | else if (formal_prec != TYPE_PRECISION (type1)) | |
d4ee4d25 | 2247 | warning (0, "passing argument %d of %qE with different " |
03dafa61 | 2248 | "width due to prototype", argnum, rname); |
8df83eae | 2249 | else if (TYPE_UNSIGNED (type) == TYPE_UNSIGNED (type1)) |
d45cf215 | 2250 | ; |
800cd3b9 RS |
2251 | /* Don't complain if the formal parameter type |
2252 | is an enum, because we can't tell now whether | |
2253 | the value was an enum--even the same enum. */ | |
2254 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
2255 | ; | |
400fbf9f JW |
2256 | else if (TREE_CODE (val) == INTEGER_CST |
2257 | && int_fits_type_p (val, type)) | |
2258 | /* Change in signedness doesn't matter | |
2259 | if a constant value is unaffected. */ | |
2260 | ; | |
ce9895ae RS |
2261 | /* If the value is extended from a narrower |
2262 | unsigned type, it doesn't matter whether we | |
2263 | pass it as signed or unsigned; the value | |
2264 | certainly is the same either way. */ | |
2265 | else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type) | |
8df83eae | 2266 | && TYPE_UNSIGNED (TREE_TYPE (val))) |
ce9895ae | 2267 | ; |
8df83eae | 2268 | else if (TYPE_UNSIGNED (type)) |
d4ee4d25 | 2269 | warning (0, "passing argument %d of %qE as unsigned " |
03dafa61 | 2270 | "due to prototype", argnum, rname); |
3ed56f8a | 2271 | else |
d4ee4d25 | 2272 | warning (0, "passing argument %d of %qE as signed " |
03dafa61 | 2273 | "due to prototype", argnum, rname); |
400fbf9f JW |
2274 | } |
2275 | } | |
2276 | ||
2ac2f164 JM |
2277 | parmval = convert_for_assignment (type, val, ic_argpass, |
2278 | fundecl, function, | |
2279 | parmnum + 1); | |
2f6e4e97 | 2280 | |
61f71b34 | 2281 | if (targetm.calls.promote_prototypes (fundecl ? TREE_TYPE (fundecl) : 0) |
b6d6aa84 | 2282 | && INTEGRAL_TYPE_P (type) |
400fbf9f JW |
2283 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) |
2284 | parmval = default_conversion (parmval); | |
400fbf9f | 2285 | } |
8d9bfdc5 | 2286 | result = tree_cons (NULL_TREE, parmval, result); |
400fbf9f JW |
2287 | } |
2288 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2289 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2290 | < TYPE_PRECISION (double_type_node))) | |
2291 | /* Convert `float' to `double'. */ | |
2292 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
4d3e6fae FJ |
2293 | else if ((invalid_func_diag = |
2294 | targetm.calls.invalid_arg_for_unprototyped_fn (typelist, fundecl, val))) | |
2295 | { | |
2296 | error (invalid_func_diag); | |
2297 | return error_mark_node; | |
2298 | } | |
400fbf9f JW |
2299 | else |
2300 | /* Convert `short' and `char' to full-size `int'. */ | |
2301 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
2302 | ||
2303 | if (typetail) | |
2304 | typetail = TREE_CHAIN (typetail); | |
2305 | } | |
2306 | ||
2307 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) | |
3789b316 JM |
2308 | { |
2309 | error ("too few arguments to function %qE", function); | |
2310 | return error_mark_node; | |
2311 | } | |
400fbf9f JW |
2312 | |
2313 | return nreverse (result); | |
2314 | } | |
2315 | \f | |
43f6dfd3 RS |
2316 | /* This is the entry point used by the parser to build unary operators |
2317 | in the input. CODE, a tree_code, specifies the unary operator, and | |
2318 | ARG is the operand. For unary plus, the C parser currently uses | |
2319 | CONVERT_EXPR for code. */ | |
2320 | ||
2321 | struct c_expr | |
2322 | parser_build_unary_op (enum tree_code code, struct c_expr arg) | |
2323 | { | |
2324 | struct c_expr result; | |
2325 | ||
2326 | result.original_code = ERROR_MARK; | |
2327 | result.value = build_unary_op (code, arg.value, 0); | |
2328 | overflow_warning (result.value); | |
2329 | return result; | |
2330 | } | |
2331 | ||
2332 | /* This is the entry point used by the parser to build binary operators | |
2333 | in the input. CODE, a tree_code, specifies the binary operator, and | |
2334 | ARG1 and ARG2 are the operands. In addition to constructing the | |
2335 | expression, we check for operands that were written with other binary | |
2336 | operators in a way that is likely to confuse the user. */ | |
edc7c4ec | 2337 | |
487a92fe JM |
2338 | struct c_expr |
2339 | parser_build_binary_op (enum tree_code code, struct c_expr arg1, | |
2340 | struct c_expr arg2) | |
400fbf9f | 2341 | { |
487a92fe | 2342 | struct c_expr result; |
400fbf9f | 2343 | |
487a92fe JM |
2344 | enum tree_code code1 = arg1.original_code; |
2345 | enum tree_code code2 = arg2.original_code; | |
400fbf9f | 2346 | |
487a92fe JM |
2347 | result.value = build_binary_op (code, arg1.value, arg2.value, 1); |
2348 | result.original_code = code; | |
58bf601b | 2349 | |
487a92fe JM |
2350 | if (TREE_CODE (result.value) == ERROR_MARK) |
2351 | return result; | |
400fbf9f JW |
2352 | |
2353 | /* Check for cases such as x+y<<z which users are likely | |
487a92fe | 2354 | to misinterpret. */ |
400fbf9f JW |
2355 | if (warn_parentheses) |
2356 | { | |
2357 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
2358 | { | |
2359 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2360 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
d4ee4d25 | 2361 | warning (0, "suggest parentheses around + or - inside shift"); |
400fbf9f JW |
2362 | } |
2363 | ||
2364 | if (code == TRUTH_ORIF_EXPR) | |
2365 | { | |
2366 | if (code1 == TRUTH_ANDIF_EXPR | |
2367 | || code2 == TRUTH_ANDIF_EXPR) | |
d4ee4d25 | 2368 | warning (0, "suggest parentheses around && within ||"); |
400fbf9f JW |
2369 | } |
2370 | ||
2371 | if (code == BIT_IOR_EXPR) | |
2372 | { | |
2373 | if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR | |
2374 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2375 | || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR | |
2376 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
d4ee4d25 | 2377 | warning (0, "suggest parentheses around arithmetic in operand of |"); |
7e9d002a | 2378 | /* Check cases like x|y==z */ |
6615c446 JO |
2379 | if (TREE_CODE_CLASS (code1) == tcc_comparison |
2380 | || TREE_CODE_CLASS (code2) == tcc_comparison) | |
d4ee4d25 | 2381 | warning (0, "suggest parentheses around comparison in operand of |"); |
400fbf9f JW |
2382 | } |
2383 | ||
2384 | if (code == BIT_XOR_EXPR) | |
2385 | { | |
2386 | if (code1 == BIT_AND_EXPR | |
2387 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2388 | || code2 == BIT_AND_EXPR | |
2389 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
d4ee4d25 | 2390 | warning (0, "suggest parentheses around arithmetic in operand of ^"); |
7e9d002a | 2391 | /* Check cases like x^y==z */ |
6615c446 JO |
2392 | if (TREE_CODE_CLASS (code1) == tcc_comparison |
2393 | || TREE_CODE_CLASS (code2) == tcc_comparison) | |
d4ee4d25 | 2394 | warning (0, "suggest parentheses around comparison in operand of ^"); |
400fbf9f JW |
2395 | } |
2396 | ||
2397 | if (code == BIT_AND_EXPR) | |
2398 | { | |
2399 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2400 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
d4ee4d25 | 2401 | warning (0, "suggest parentheses around + or - in operand of &"); |
7e9d002a | 2402 | /* Check cases like x&y==z */ |
6615c446 JO |
2403 | if (TREE_CODE_CLASS (code1) == tcc_comparison |
2404 | || TREE_CODE_CLASS (code2) == tcc_comparison) | |
d4ee4d25 | 2405 | warning (0, "suggest parentheses around comparison in operand of &"); |
400fbf9f | 2406 | } |
3e3970a2 | 2407 | /* Similarly, check for cases like 1<=i<=10 that are probably errors. */ |
6615c446 JO |
2408 | if (TREE_CODE_CLASS (code) == tcc_comparison |
2409 | && (TREE_CODE_CLASS (code1) == tcc_comparison | |
2410 | || TREE_CODE_CLASS (code2) == tcc_comparison)) | |
d4ee4d25 | 2411 | warning (0, "comparisons like X<=Y<=Z do not have their mathematical meaning"); |
400fbf9f | 2412 | |
3e3970a2 | 2413 | } |
001af587 | 2414 | |
487a92fe JM |
2415 | unsigned_conversion_warning (result.value, arg1.value); |
2416 | unsigned_conversion_warning (result.value, arg2.value); | |
2417 | overflow_warning (result.value); | |
400fbf9f JW |
2418 | |
2419 | return result; | |
2420 | } | |
3e4093b6 | 2421 | \f |
3e4093b6 RS |
2422 | /* Return a tree for the difference of pointers OP0 and OP1. |
2423 | The resulting tree has type int. */ | |
293c9fdd | 2424 | |
3e4093b6 RS |
2425 | static tree |
2426 | pointer_diff (tree op0, tree op1) | |
2427 | { | |
3e4093b6 | 2428 | tree restype = ptrdiff_type_node; |
400fbf9f | 2429 | |
3e4093b6 RS |
2430 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); |
2431 | tree con0, con1, lit0, lit1; | |
2432 | tree orig_op1 = op1; | |
400fbf9f | 2433 | |
3e4093b6 RS |
2434 | if (pedantic || warn_pointer_arith) |
2435 | { | |
2436 | if (TREE_CODE (target_type) == VOID_TYPE) | |
bda67431 | 2437 | pedwarn ("pointer of type %<void *%> used in subtraction"); |
3e4093b6 RS |
2438 | if (TREE_CODE (target_type) == FUNCTION_TYPE) |
2439 | pedwarn ("pointer to a function used in subtraction"); | |
2440 | } | |
400fbf9f | 2441 | |
3e4093b6 RS |
2442 | /* If the conversion to ptrdiff_type does anything like widening or |
2443 | converting a partial to an integral mode, we get a convert_expression | |
2444 | that is in the way to do any simplifications. | |
2445 | (fold-const.c doesn't know that the extra bits won't be needed. | |
2446 | split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a | |
2447 | different mode in place.) | |
2448 | So first try to find a common term here 'by hand'; we want to cover | |
2449 | at least the cases that occur in legal static initializers. */ | |
2450 | con0 = TREE_CODE (op0) == NOP_EXPR ? TREE_OPERAND (op0, 0) : op0; | |
2451 | con1 = TREE_CODE (op1) == NOP_EXPR ? TREE_OPERAND (op1, 0) : op1; | |
400fbf9f | 2452 | |
3e4093b6 RS |
2453 | if (TREE_CODE (con0) == PLUS_EXPR) |
2454 | { | |
2455 | lit0 = TREE_OPERAND (con0, 1); | |
2456 | con0 = TREE_OPERAND (con0, 0); | |
2457 | } | |
2458 | else | |
2459 | lit0 = integer_zero_node; | |
400fbf9f | 2460 | |
3e4093b6 | 2461 | if (TREE_CODE (con1) == PLUS_EXPR) |
400fbf9f | 2462 | { |
3e4093b6 RS |
2463 | lit1 = TREE_OPERAND (con1, 1); |
2464 | con1 = TREE_OPERAND (con1, 0); | |
400fbf9f JW |
2465 | } |
2466 | else | |
3e4093b6 RS |
2467 | lit1 = integer_zero_node; |
2468 | ||
2469 | if (operand_equal_p (con0, con1, 0)) | |
400fbf9f | 2470 | { |
3e4093b6 RS |
2471 | op0 = lit0; |
2472 | op1 = lit1; | |
400fbf9f JW |
2473 | } |
2474 | ||
400fbf9f | 2475 | |
3e4093b6 RS |
2476 | /* First do the subtraction as integers; |
2477 | then drop through to build the divide operator. | |
2478 | Do not do default conversions on the minus operator | |
2479 | in case restype is a short type. */ | |
400fbf9f | 2480 | |
3e4093b6 RS |
2481 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), |
2482 | convert (restype, op1), 0); | |
2483 | /* This generates an error if op1 is pointer to incomplete type. */ | |
2484 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1)))) | |
2485 | error ("arithmetic on pointer to an incomplete type"); | |
400fbf9f | 2486 | |
3e4093b6 RS |
2487 | /* This generates an error if op0 is pointer to incomplete type. */ |
2488 | op1 = c_size_in_bytes (target_type); | |
400fbf9f | 2489 | |
3e4093b6 | 2490 | /* Divide by the size, in easiest possible way. */ |
53fb4de3 | 2491 | return fold (build2 (EXACT_DIV_EXPR, restype, op0, convert (restype, op1))); |
3e4093b6 RS |
2492 | } |
2493 | \f | |
2494 | /* Construct and perhaps optimize a tree representation | |
2495 | for a unary operation. CODE, a tree_code, specifies the operation | |
2496 | and XARG is the operand. | |
2497 | For any CODE other than ADDR_EXPR, FLAG nonzero suppresses | |
2498 | the default promotions (such as from short to int). | |
2499 | For ADDR_EXPR, the default promotions are not applied; FLAG nonzero | |
2500 | allows non-lvalues; this is only used to handle conversion of non-lvalue | |
2501 | arrays to pointers in C99. */ | |
400fbf9f | 2502 | |
3e4093b6 RS |
2503 | tree |
2504 | build_unary_op (enum tree_code code, tree xarg, int flag) | |
2505 | { | |
2506 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
2507 | tree arg = xarg; | |
2508 | tree argtype = 0; | |
2509 | enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); | |
2510 | tree val; | |
2511 | int noconvert = flag; | |
400fbf9f | 2512 | |
3e4093b6 RS |
2513 | if (typecode == ERROR_MARK) |
2514 | return error_mark_node; | |
2515 | if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE) | |
2516 | typecode = INTEGER_TYPE; | |
6c36d76b | 2517 | |
3e4093b6 RS |
2518 | switch (code) |
2519 | { | |
2520 | case CONVERT_EXPR: | |
2521 | /* This is used for unary plus, because a CONVERT_EXPR | |
2522 | is enough to prevent anybody from looking inside for | |
2523 | associativity, but won't generate any code. */ | |
2524 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
8a2cee38 JB |
2525 | || typecode == COMPLEX_TYPE |
2526 | || typecode == VECTOR_TYPE)) | |
400fbf9f | 2527 | { |
3e4093b6 RS |
2528 | error ("wrong type argument to unary plus"); |
2529 | return error_mark_node; | |
400fbf9f | 2530 | } |
3e4093b6 RS |
2531 | else if (!noconvert) |
2532 | arg = default_conversion (arg); | |
2533 | arg = non_lvalue (arg); | |
400fbf9f JW |
2534 | break; |
2535 | ||
3e4093b6 RS |
2536 | case NEGATE_EXPR: |
2537 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
2538 | || typecode == COMPLEX_TYPE | |
2539 | || typecode == VECTOR_TYPE)) | |
2540 | { | |
2541 | error ("wrong type argument to unary minus"); | |
2542 | return error_mark_node; | |
2543 | } | |
2544 | else if (!noconvert) | |
2545 | arg = default_conversion (arg); | |
400fbf9f JW |
2546 | break; |
2547 | ||
3e4093b6 RS |
2548 | case BIT_NOT_EXPR: |
2549 | if (typecode == INTEGER_TYPE || typecode == VECTOR_TYPE) | |
03d5b1f5 | 2550 | { |
3e4093b6 RS |
2551 | if (!noconvert) |
2552 | arg = default_conversion (arg); | |
03d5b1f5 | 2553 | } |
3e4093b6 | 2554 | else if (typecode == COMPLEX_TYPE) |
400fbf9f | 2555 | { |
3e4093b6 RS |
2556 | code = CONJ_EXPR; |
2557 | if (pedantic) | |
bda67431 | 2558 | pedwarn ("ISO C does not support %<~%> for complex conjugation"); |
3e4093b6 RS |
2559 | if (!noconvert) |
2560 | arg = default_conversion (arg); | |
2561 | } | |
2562 | else | |
2563 | { | |
2564 | error ("wrong type argument to bit-complement"); | |
2565 | return error_mark_node; | |
400fbf9f JW |
2566 | } |
2567 | break; | |
2568 | ||
3e4093b6 | 2569 | case ABS_EXPR: |
11017cc7 | 2570 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE)) |
400fbf9f | 2571 | { |
3e4093b6 RS |
2572 | error ("wrong type argument to abs"); |
2573 | return error_mark_node; | |
400fbf9f | 2574 | } |
3e4093b6 RS |
2575 | else if (!noconvert) |
2576 | arg = default_conversion (arg); | |
400fbf9f JW |
2577 | break; |
2578 | ||
3e4093b6 RS |
2579 | case CONJ_EXPR: |
2580 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
2581 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
2582 | || typecode == COMPLEX_TYPE)) | |
400fbf9f | 2583 | { |
3e4093b6 RS |
2584 | error ("wrong type argument to conjugation"); |
2585 | return error_mark_node; | |
400fbf9f | 2586 | } |
3e4093b6 RS |
2587 | else if (!noconvert) |
2588 | arg = default_conversion (arg); | |
400fbf9f JW |
2589 | break; |
2590 | ||
3e4093b6 | 2591 | case TRUTH_NOT_EXPR: |
85498824 JM |
2592 | /* ??? Why do most validation here but that for non-lvalue arrays |
2593 | in c_objc_common_truthvalue_conversion? */ | |
3e4093b6 RS |
2594 | if (typecode != INTEGER_TYPE |
2595 | && typecode != REAL_TYPE && typecode != POINTER_TYPE | |
2596 | && typecode != COMPLEX_TYPE | |
2597 | /* These will convert to a pointer. */ | |
2598 | && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE) | |
400fbf9f | 2599 | { |
3e4093b6 RS |
2600 | error ("wrong type argument to unary exclamation mark"); |
2601 | return error_mark_node; | |
400fbf9f | 2602 | } |
85498824 | 2603 | arg = c_objc_common_truthvalue_conversion (arg); |
3e4093b6 RS |
2604 | return invert_truthvalue (arg); |
2605 | ||
2606 | case NOP_EXPR: | |
400fbf9f JW |
2607 | break; |
2608 | ||
3e4093b6 RS |
2609 | case REALPART_EXPR: |
2610 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2611 | return TREE_REALPART (arg); | |
2612 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2613 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2614 | else | |
2615 | return arg; | |
605a99f6 | 2616 | |
3e4093b6 RS |
2617 | case IMAGPART_EXPR: |
2618 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2619 | return TREE_IMAGPART (arg); | |
2620 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2621 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2622 | else | |
2623 | return convert (TREE_TYPE (arg), integer_zero_node); | |
2624 | ||
2625 | case PREINCREMENT_EXPR: | |
2626 | case POSTINCREMENT_EXPR: | |
2627 | case PREDECREMENT_EXPR: | |
2628 | case POSTDECREMENT_EXPR: | |
3e4093b6 RS |
2629 | |
2630 | /* Increment or decrement the real part of the value, | |
2631 | and don't change the imaginary part. */ | |
2632 | if (typecode == COMPLEX_TYPE) | |
400fbf9f | 2633 | { |
3e4093b6 RS |
2634 | tree real, imag; |
2635 | ||
2636 | if (pedantic) | |
bda67431 JM |
2637 | pedwarn ("ISO C does not support %<++%> and %<--%>" |
2638 | " on complex types"); | |
3e4093b6 RS |
2639 | |
2640 | arg = stabilize_reference (arg); | |
2641 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
2642 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
53fb4de3 RS |
2643 | return build2 (COMPLEX_EXPR, TREE_TYPE (arg), |
2644 | build_unary_op (code, real, 1), imag); | |
400fbf9f | 2645 | } |
3e4093b6 RS |
2646 | |
2647 | /* Report invalid types. */ | |
2648 | ||
2649 | if (typecode != POINTER_TYPE | |
2650 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) | |
400fbf9f | 2651 | { |
3e4093b6 RS |
2652 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) |
2653 | error ("wrong type argument to increment"); | |
2654 | else | |
2655 | error ("wrong type argument to decrement"); | |
2656 | ||
2657 | return error_mark_node; | |
400fbf9f | 2658 | } |
400fbf9f | 2659 | |
3e4093b6 RS |
2660 | { |
2661 | tree inc; | |
2662 | tree result_type = TREE_TYPE (arg); | |
400fbf9f | 2663 | |
3e4093b6 RS |
2664 | arg = get_unwidened (arg, 0); |
2665 | argtype = TREE_TYPE (arg); | |
2666 | ||
2667 | /* Compute the increment. */ | |
2668 | ||
2669 | if (typecode == POINTER_TYPE) | |
2670 | { | |
2671 | /* If pointer target is an undefined struct, | |
2672 | we just cannot know how to do the arithmetic. */ | |
2673 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type))) | |
2674 | { | |
2675 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
2676 | error ("increment of pointer to unknown structure"); | |
2677 | else | |
2678 | error ("decrement of pointer to unknown structure"); | |
2679 | } | |
2680 | else if ((pedantic || warn_pointer_arith) | |
2681 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
2682 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
2683 | { | |
2684 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
2685 | pedwarn ("wrong type argument to increment"); | |
2686 | else | |
2687 | pedwarn ("wrong type argument to decrement"); | |
2688 | } | |
2689 | ||
2690 | inc = c_size_in_bytes (TREE_TYPE (result_type)); | |
2691 | } | |
2692 | else | |
2693 | inc = integer_one_node; | |
2694 | ||
2695 | inc = convert (argtype, inc); | |
2696 | ||
3e4093b6 RS |
2697 | /* Complain about anything else that is not a true lvalue. */ |
2698 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
2699 | || code == POSTINCREMENT_EXPR) | |
9bf24266 JM |
2700 | ? lv_increment |
2701 | : lv_decrement))) | |
3e4093b6 RS |
2702 | return error_mark_node; |
2703 | ||
2704 | /* Report a read-only lvalue. */ | |
2705 | if (TREE_READONLY (arg)) | |
c5b6f18e MM |
2706 | readonly_error (arg, |
2707 | ((code == PREINCREMENT_EXPR | |
2708 | || code == POSTINCREMENT_EXPR) | |
9bf24266 | 2709 | ? lv_increment : lv_decrement)); |
3e4093b6 RS |
2710 | |
2711 | if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE) | |
2712 | val = boolean_increment (code, arg); | |
2713 | else | |
53fb4de3 | 2714 | val = build2 (code, TREE_TYPE (arg), arg, inc); |
3e4093b6 RS |
2715 | TREE_SIDE_EFFECTS (val) = 1; |
2716 | val = convert (result_type, val); | |
2717 | if (TREE_CODE (val) != code) | |
6de9cd9a | 2718 | TREE_NO_WARNING (val) = 1; |
3e4093b6 RS |
2719 | return val; |
2720 | } | |
2721 | ||
2722 | case ADDR_EXPR: | |
2723 | /* Note that this operation never does default_conversion. */ | |
2724 | ||
2725 | /* Let &* cancel out to simplify resulting code. */ | |
2726 | if (TREE_CODE (arg) == INDIRECT_REF) | |
400fbf9f | 2727 | { |
3e4093b6 RS |
2728 | /* Don't let this be an lvalue. */ |
2729 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
2730 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
2731 | return TREE_OPERAND (arg, 0); | |
400fbf9f | 2732 | } |
1eb8759b | 2733 | |
7c672dfc | 2734 | /* For &x[y], return x+y */ |
3e4093b6 | 2735 | if (TREE_CODE (arg) == ARRAY_REF) |
1eb8759b | 2736 | { |
3e4093b6 RS |
2737 | if (!c_mark_addressable (TREE_OPERAND (arg, 0))) |
2738 | return error_mark_node; | |
7c672dfc AP |
2739 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), |
2740 | TREE_OPERAND (arg, 1), 1); | |
1eb8759b | 2741 | } |
1eb8759b | 2742 | |
3e4093b6 RS |
2743 | /* Anything not already handled and not a true memory reference |
2744 | or a non-lvalue array is an error. */ | |
2745 | else if (typecode != FUNCTION_TYPE && !flag | |
9bf24266 | 2746 | && !lvalue_or_else (arg, lv_addressof)) |
3e4093b6 | 2747 | return error_mark_node; |
b6a10c9f | 2748 | |
3e4093b6 RS |
2749 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ |
2750 | argtype = TREE_TYPE (arg); | |
400fbf9f | 2751 | |
3e4093b6 RS |
2752 | /* If the lvalue is const or volatile, merge that into the type |
2753 | to which the address will point. Note that you can't get a | |
2754 | restricted pointer by taking the address of something, so we | |
2755 | only have to deal with `const' and `volatile' here. */ | |
6615c446 | 2756 | if ((DECL_P (arg) || REFERENCE_CLASS_P (arg)) |
3e4093b6 RS |
2757 | && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg))) |
2758 | argtype = c_build_type_variant (argtype, | |
2759 | TREE_READONLY (arg), | |
2760 | TREE_THIS_VOLATILE (arg)); | |
400fbf9f | 2761 | |
3e4093b6 RS |
2762 | if (!c_mark_addressable (arg)) |
2763 | return error_mark_node; | |
400fbf9f | 2764 | |
abb54d14 JM |
2765 | gcc_assert (TREE_CODE (arg) != COMPONENT_REF |
2766 | || !DECL_C_BIT_FIELD (TREE_OPERAND (arg, 1))); | |
400fbf9f | 2767 | |
5cc200fc | 2768 | argtype = build_pointer_type (argtype); |
5e55f99d RH |
2769 | |
2770 | /* ??? Cope with user tricks that amount to offsetof. Delete this | |
2771 | when we have proper support for integer constant expressions. */ | |
2772 | val = get_base_address (arg); | |
2773 | if (val && TREE_CODE (val) == INDIRECT_REF | |
2774 | && integer_zerop (TREE_OPERAND (val, 0))) | |
2775 | return fold_convert (argtype, fold_offsetof (arg)); | |
2776 | ||
5cc200fc | 2777 | val = build1 (ADDR_EXPR, argtype, arg); |
400fbf9f | 2778 | |
5cc200fc RH |
2779 | if (TREE_CODE (arg) == COMPOUND_LITERAL_EXPR) |
2780 | TREE_INVARIANT (val) = TREE_CONSTANT (val) = 1; | |
44de5aeb | 2781 | |
5cc200fc | 2782 | return val; |
400fbf9f | 2783 | |
3e4093b6 RS |
2784 | default: |
2785 | break; | |
2786 | } | |
400fbf9f | 2787 | |
3e4093b6 RS |
2788 | if (argtype == 0) |
2789 | argtype = TREE_TYPE (arg); | |
bf730f15 RS |
2790 | val = build1 (code, argtype, arg); |
2791 | return require_constant_value ? fold_initializer (val) : fold (val); | |
3e4093b6 | 2792 | } |
400fbf9f | 2793 | |
3e4093b6 RS |
2794 | /* Return nonzero if REF is an lvalue valid for this language. |
2795 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
5baeaac0 | 2796 | Lvalues can have their address taken, unless they have C_DECL_REGISTER. */ |
400fbf9f | 2797 | |
37dc0d8d | 2798 | static int |
3e4093b6 RS |
2799 | lvalue_p (tree ref) |
2800 | { | |
2801 | enum tree_code code = TREE_CODE (ref); | |
400fbf9f | 2802 | |
3e4093b6 RS |
2803 | switch (code) |
2804 | { | |
2805 | case REALPART_EXPR: | |
2806 | case IMAGPART_EXPR: | |
2807 | case COMPONENT_REF: | |
2808 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
400fbf9f | 2809 | |
3e4093b6 RS |
2810 | case COMPOUND_LITERAL_EXPR: |
2811 | case STRING_CST: | |
2812 | return 1; | |
400fbf9f | 2813 | |
3e4093b6 RS |
2814 | case INDIRECT_REF: |
2815 | case ARRAY_REF: | |
2816 | case VAR_DECL: | |
2817 | case PARM_DECL: | |
2818 | case RESULT_DECL: | |
2819 | case ERROR_MARK: | |
2820 | return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE | |
2821 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE); | |
665f2503 | 2822 | |
3e4093b6 | 2823 | case BIND_EXPR: |
3e4093b6 | 2824 | return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE; |
665f2503 | 2825 | |
3e4093b6 RS |
2826 | default: |
2827 | return 0; | |
2828 | } | |
2829 | } | |
400fbf9f | 2830 | \f |
9bf24266 | 2831 | /* Give an error for storing in something that is 'const'. */ |
54c93c30 | 2832 | |
9bf24266 JM |
2833 | static void |
2834 | readonly_error (tree arg, enum lvalue_use use) | |
54c93c30 | 2835 | { |
9bf24266 JM |
2836 | gcc_assert (use == lv_assign || use == lv_increment || use == lv_decrement); |
2837 | /* Using this macro rather than (for example) arrays of messages | |
2838 | ensures that all the format strings are checked at compile | |
2839 | time. */ | |
2840 | #define READONLY_MSG(A, I, D) (use == lv_assign \ | |
2841 | ? (A) \ | |
2842 | : (use == lv_increment ? (I) : (D))) | |
3e4093b6 | 2843 | if (TREE_CODE (arg) == COMPONENT_REF) |
54c93c30 | 2844 | { |
3e4093b6 | 2845 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) |
9bf24266 | 2846 | readonly_error (TREE_OPERAND (arg, 0), use); |
3e4093b6 | 2847 | else |
c51a1ba9 JM |
2848 | error (READONLY_MSG (N_("assignment of read-only member %qD"), |
2849 | N_("increment of read-only member %qD"), | |
2850 | N_("decrement of read-only member %qD")), | |
2851 | TREE_OPERAND (arg, 1)); | |
54c93c30 | 2852 | } |
3e4093b6 | 2853 | else if (TREE_CODE (arg) == VAR_DECL) |
c51a1ba9 JM |
2854 | error (READONLY_MSG (N_("assignment of read-only variable %qD"), |
2855 | N_("increment of read-only variable %qD"), | |
2856 | N_("decrement of read-only variable %qD")), | |
2857 | arg); | |
3e4093b6 | 2858 | else |
9bf24266 JM |
2859 | error (READONLY_MSG (N_("assignment of read-only location"), |
2860 | N_("increment of read-only location"), | |
2861 | N_("decrement of read-only location"))); | |
54c93c30 | 2862 | } |
37dc0d8d JM |
2863 | |
2864 | ||
2865 | /* Return nonzero if REF is an lvalue valid for this language; | |
2866 | otherwise, print an error message and return zero. USE says | |
2867 | how the lvalue is being used and so selects the error message. */ | |
2868 | ||
2869 | static int | |
2870 | lvalue_or_else (tree ref, enum lvalue_use use) | |
2871 | { | |
2872 | int win = lvalue_p (ref); | |
2873 | ||
2874 | if (!win) | |
2875 | lvalue_error (use); | |
2876 | ||
2877 | return win; | |
2878 | } | |
3e4093b6 RS |
2879 | \f |
2880 | /* Mark EXP saying that we need to be able to take the | |
2881 | address of it; it should not be allocated in a register. | |
2882 | Returns true if successful. */ | |
54c93c30 | 2883 | |
3e4093b6 RS |
2884 | bool |
2885 | c_mark_addressable (tree exp) | |
400fbf9f | 2886 | { |
3e4093b6 | 2887 | tree x = exp; |
95602da1 | 2888 | |
3e4093b6 RS |
2889 | while (1) |
2890 | switch (TREE_CODE (x)) | |
2891 | { | |
2892 | case COMPONENT_REF: | |
2893 | if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1))) | |
2894 | { | |
0039fa55 AN |
2895 | error |
2896 | ("cannot take address of bit-field %qD", TREE_OPERAND (x, 1)); | |
3e4093b6 RS |
2897 | return false; |
2898 | } | |
95602da1 | 2899 | |
3e4093b6 | 2900 | /* ... fall through ... */ |
95602da1 | 2901 | |
3e4093b6 RS |
2902 | case ADDR_EXPR: |
2903 | case ARRAY_REF: | |
2904 | case REALPART_EXPR: | |
2905 | case IMAGPART_EXPR: | |
2906 | x = TREE_OPERAND (x, 0); | |
2907 | break; | |
95602da1 | 2908 | |
3e4093b6 RS |
2909 | case COMPOUND_LITERAL_EXPR: |
2910 | case CONSTRUCTOR: | |
2911 | TREE_ADDRESSABLE (x) = 1; | |
2912 | return true; | |
95602da1 | 2913 | |
3e4093b6 RS |
2914 | case VAR_DECL: |
2915 | case CONST_DECL: | |
2916 | case PARM_DECL: | |
2917 | case RESULT_DECL: | |
5baeaac0 | 2918 | if (C_DECL_REGISTER (x) |
3e4093b6 RS |
2919 | && DECL_NONLOCAL (x)) |
2920 | { | |
e697b20f | 2921 | if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x)) |
3e4093b6 | 2922 | { |
0039fa55 AN |
2923 | error |
2924 | ("global register variable %qD used in nested function", x); | |
3e4093b6 RS |
2925 | return false; |
2926 | } | |
0039fa55 | 2927 | pedwarn ("register variable %qD used in nested function", x); |
3e4093b6 | 2928 | } |
5baeaac0 | 2929 | else if (C_DECL_REGISTER (x)) |
3e4093b6 | 2930 | { |
e697b20f | 2931 | if (TREE_PUBLIC (x) || TREE_STATIC (x) || DECL_EXTERNAL (x)) |
0039fa55 AN |
2932 | error ("address of global register variable %qD requested", x); |
2933 | else | |
2934 | error ("address of register variable %qD requested", x); | |
2935 | return false; | |
3e4093b6 | 2936 | } |
400fbf9f | 2937 | |
3e4093b6 RS |
2938 | /* drops in */ |
2939 | case FUNCTION_DECL: | |
2940 | TREE_ADDRESSABLE (x) = 1; | |
2941 | /* drops out */ | |
2942 | default: | |
2943 | return true; | |
2944 | } | |
2945 | } | |
2946 | \f | |
2947 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
400fbf9f JW |
2948 | |
2949 | tree | |
3e4093b6 | 2950 | build_conditional_expr (tree ifexp, tree op1, tree op2) |
400fbf9f | 2951 | { |
3e4093b6 RS |
2952 | tree type1; |
2953 | tree type2; | |
2954 | enum tree_code code1; | |
2955 | enum tree_code code2; | |
2956 | tree result_type = NULL; | |
2957 | tree orig_op1 = op1, orig_op2 = op2; | |
400fbf9f | 2958 | |
3e4093b6 RS |
2959 | /* Promote both alternatives. */ |
2960 | ||
2961 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
2962 | op1 = default_conversion (op1); | |
2963 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
2964 | op2 = default_conversion (op2); | |
2965 | ||
2966 | if (TREE_CODE (ifexp) == ERROR_MARK | |
2967 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
2968 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
400fbf9f | 2969 | return error_mark_node; |
400fbf9f | 2970 | |
3e4093b6 RS |
2971 | type1 = TREE_TYPE (op1); |
2972 | code1 = TREE_CODE (type1); | |
2973 | type2 = TREE_TYPE (op2); | |
2974 | code2 = TREE_CODE (type2); | |
2975 | ||
b1adf557 JM |
2976 | /* C90 does not permit non-lvalue arrays in conditional expressions. |
2977 | In C99 they will be pointers by now. */ | |
2978 | if (code1 == ARRAY_TYPE || code2 == ARRAY_TYPE) | |
2979 | { | |
2980 | error ("non-lvalue array in conditional expression"); | |
2981 | return error_mark_node; | |
2982 | } | |
2983 | ||
3e4093b6 RS |
2984 | /* Quickly detect the usual case where op1 and op2 have the same type |
2985 | after promotion. */ | |
2986 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) | |
400fbf9f | 2987 | { |
3e4093b6 RS |
2988 | if (type1 == type2) |
2989 | result_type = type1; | |
2990 | else | |
2991 | result_type = TYPE_MAIN_VARIANT (type1); | |
2992 | } | |
2993 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2994 | || code1 == COMPLEX_TYPE) | |
2995 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE | |
2996 | || code2 == COMPLEX_TYPE)) | |
2997 | { | |
ccf7f880 | 2998 | result_type = c_common_type (type1, type2); |
400fbf9f | 2999 | |
3e4093b6 RS |
3000 | /* If -Wsign-compare, warn here if type1 and type2 have |
3001 | different signedness. We'll promote the signed to unsigned | |
3002 | and later code won't know it used to be different. | |
3003 | Do this check on the original types, so that explicit casts | |
3004 | will be considered, but default promotions won't. */ | |
3005 | if (warn_sign_compare && !skip_evaluation) | |
ab87f8c8 | 3006 | { |
8df83eae RK |
3007 | int unsigned_op1 = TYPE_UNSIGNED (TREE_TYPE (orig_op1)); |
3008 | int unsigned_op2 = TYPE_UNSIGNED (TREE_TYPE (orig_op2)); | |
400fbf9f | 3009 | |
3e4093b6 RS |
3010 | if (unsigned_op1 ^ unsigned_op2) |
3011 | { | |
3012 | /* Do not warn if the result type is signed, since the | |
3013 | signed type will only be chosen if it can represent | |
3014 | all the values of the unsigned type. */ | |
3f75a254 | 3015 | if (!TYPE_UNSIGNED (result_type)) |
3e4093b6 RS |
3016 | /* OK */; |
3017 | /* Do not warn if the signed quantity is an unsuffixed | |
3018 | integer literal (or some static constant expression | |
3019 | involving such literals) and it is non-negative. */ | |
3a5b9284 RH |
3020 | else if ((unsigned_op2 && tree_expr_nonnegative_p (op1)) |
3021 | || (unsigned_op1 && tree_expr_nonnegative_p (op2))) | |
3e4093b6 RS |
3022 | /* OK */; |
3023 | else | |
d4ee4d25 | 3024 | warning (0, "signed and unsigned type in conditional expression"); |
3e4093b6 RS |
3025 | } |
3026 | } | |
3027 | } | |
3028 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3029 | { | |
3030 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
3031 | pedwarn ("ISO C forbids conditional expr with only one void side"); | |
3032 | result_type = void_type_node; | |
3033 | } | |
3034 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3035 | { | |
58393038 | 3036 | if (comp_target_types (type1, type2)) |
10bc1b1b | 3037 | result_type = common_pointer_type (type1, type2); |
3e4093b6 RS |
3038 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node |
3039 | && TREE_CODE (orig_op1) != NOP_EXPR) | |
3040 | result_type = qualify_type (type2, type1); | |
3041 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node | |
3042 | && TREE_CODE (orig_op2) != NOP_EXPR) | |
3043 | result_type = qualify_type (type1, type2); | |
3044 | else if (VOID_TYPE_P (TREE_TYPE (type1))) | |
34a80643 | 3045 | { |
3e4093b6 | 3046 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) |
bda67431 JM |
3047 | pedwarn ("ISO C forbids conditional expr between " |
3048 | "%<void *%> and function pointer"); | |
3e4093b6 RS |
3049 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type1), |
3050 | TREE_TYPE (type2))); | |
34a80643 | 3051 | } |
3e4093b6 | 3052 | else if (VOID_TYPE_P (TREE_TYPE (type2))) |
1c2a9b35 | 3053 | { |
3e4093b6 | 3054 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) |
bda67431 JM |
3055 | pedwarn ("ISO C forbids conditional expr between " |
3056 | "%<void *%> and function pointer"); | |
3e4093b6 RS |
3057 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type2), |
3058 | TREE_TYPE (type1))); | |
1c2a9b35 | 3059 | } |
34a80643 | 3060 | else |
ab87f8c8 | 3061 | { |
3e4093b6 RS |
3062 | pedwarn ("pointer type mismatch in conditional expression"); |
3063 | result_type = build_pointer_type (void_type_node); | |
ab87f8c8 | 3064 | } |
3e4093b6 RS |
3065 | } |
3066 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3067 | { | |
3f75a254 | 3068 | if (!integer_zerop (op2)) |
3e4093b6 RS |
3069 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
3070 | else | |
ab87f8c8 | 3071 | { |
3e4093b6 | 3072 | op2 = null_pointer_node; |
ab87f8c8 | 3073 | } |
3e4093b6 RS |
3074 | result_type = type1; |
3075 | } | |
3076 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3077 | { | |
3078 | if (!integer_zerop (op1)) | |
3079 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3080 | else | |
ab87f8c8 | 3081 | { |
3e4093b6 | 3082 | op1 = null_pointer_node; |
ab87f8c8 | 3083 | } |
3e4093b6 RS |
3084 | result_type = type2; |
3085 | } | |
1c2a9b35 | 3086 | |
3e4093b6 RS |
3087 | if (!result_type) |
3088 | { | |
3089 | if (flag_cond_mismatch) | |
3090 | result_type = void_type_node; | |
3091 | else | |
400fbf9f | 3092 | { |
3e4093b6 | 3093 | error ("type mismatch in conditional expression"); |
ab87f8c8 | 3094 | return error_mark_node; |
400fbf9f | 3095 | } |
3e4093b6 | 3096 | } |
400fbf9f | 3097 | |
3e4093b6 RS |
3098 | /* Merge const and volatile flags of the incoming types. */ |
3099 | result_type | |
3100 | = build_type_variant (result_type, | |
3101 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
3102 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
b6a10c9f | 3103 | |
3e4093b6 RS |
3104 | if (result_type != TREE_TYPE (op1)) |
3105 | op1 = convert_and_check (result_type, op1); | |
3106 | if (result_type != TREE_TYPE (op2)) | |
3107 | op2 = convert_and_check (result_type, op2); | |
b6a10c9f | 3108 | |
8c900457 | 3109 | return fold_build3 (COND_EXPR, result_type, ifexp, op1, op2); |
3e4093b6 RS |
3110 | } |
3111 | \f | |
487a92fe JM |
3112 | /* Return a compound expression that performs two expressions and |
3113 | returns the value of the second of them. */ | |
400fbf9f | 3114 | |
3e4093b6 | 3115 | tree |
487a92fe | 3116 | build_compound_expr (tree expr1, tree expr2) |
3e4093b6 | 3117 | { |
487a92fe JM |
3118 | /* Convert arrays and functions to pointers. */ |
3119 | expr2 = default_function_array_conversion (expr2); | |
400fbf9f | 3120 | |
3f75a254 | 3121 | if (!TREE_SIDE_EFFECTS (expr1)) |
3e4093b6 RS |
3122 | { |
3123 | /* The left-hand operand of a comma expression is like an expression | |
3124 | statement: with -Wextra or -Wunused, we should warn if it doesn't have | |
3125 | any side-effects, unless it was explicitly cast to (void). */ | |
e14a6540 | 3126 | if (warn_unused_value) |
47aecf47 | 3127 | { |
e14a6540 JM |
3128 | if (VOID_TYPE_P (TREE_TYPE (expr1)) |
3129 | && TREE_CODE (expr1) == CONVERT_EXPR) | |
47aecf47 | 3130 | ; /* (void) a, b */ |
e14a6540 JM |
3131 | else if (VOID_TYPE_P (TREE_TYPE (expr1)) |
3132 | && TREE_CODE (expr1) == COMPOUND_EXPR | |
47aecf47 JM |
3133 | && TREE_CODE (TREE_OPERAND (expr1, 1)) == CONVERT_EXPR) |
3134 | ; /* (void) a, (void) b, c */ | |
3135 | else | |
3136 | warning (0, "left-hand operand of comma expression has no effect"); | |
3137 | } | |
3e4093b6 | 3138 | } |
400fbf9f | 3139 | |
3e4093b6 RS |
3140 | /* With -Wunused, we should also warn if the left-hand operand does have |
3141 | side-effects, but computes a value which is not used. For example, in | |
3142 | `foo() + bar(), baz()' the result of the `+' operator is not used, | |
3143 | so we should issue a warning. */ | |
3144 | else if (warn_unused_value) | |
487a92fe | 3145 | warn_if_unused_value (expr1, input_location); |
400fbf9f | 3146 | |
53fb4de3 | 3147 | return build2 (COMPOUND_EXPR, TREE_TYPE (expr2), expr1, expr2); |
3e4093b6 | 3148 | } |
400fbf9f | 3149 | |
3e4093b6 | 3150 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ |
400fbf9f | 3151 | |
3e4093b6 RS |
3152 | tree |
3153 | build_c_cast (tree type, tree expr) | |
3154 | { | |
3155 | tree value = expr; | |
400fbf9f | 3156 | |
3e4093b6 RS |
3157 | if (type == error_mark_node || expr == error_mark_node) |
3158 | return error_mark_node; | |
400fbf9f | 3159 | |
3e4093b6 RS |
3160 | /* The ObjC front-end uses TYPE_MAIN_VARIANT to tie together types differing |
3161 | only in <protocol> qualifications. But when constructing cast expressions, | |
3162 | the protocols do matter and must be kept around. */ | |
700686fa ZL |
3163 | if (objc_is_object_ptr (type) && objc_is_object_ptr (TREE_TYPE (expr))) |
3164 | return build1 (NOP_EXPR, type, expr); | |
3165 | ||
3166 | type = TYPE_MAIN_VARIANT (type); | |
400fbf9f | 3167 | |
3e4093b6 RS |
3168 | if (TREE_CODE (type) == ARRAY_TYPE) |
3169 | { | |
3170 | error ("cast specifies array type"); | |
3171 | return error_mark_node; | |
3172 | } | |
400fbf9f | 3173 | |
3e4093b6 RS |
3174 | if (TREE_CODE (type) == FUNCTION_TYPE) |
3175 | { | |
3176 | error ("cast specifies function type"); | |
3177 | return error_mark_node; | |
3178 | } | |
400fbf9f | 3179 | |
3e4093b6 RS |
3180 | if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value))) |
3181 | { | |
3182 | if (pedantic) | |
400fbf9f | 3183 | { |
3e4093b6 RS |
3184 | if (TREE_CODE (type) == RECORD_TYPE |
3185 | || TREE_CODE (type) == UNION_TYPE) | |
3186 | pedwarn ("ISO C forbids casting nonscalar to the same type"); | |
400fbf9f | 3187 | } |
3e4093b6 RS |
3188 | } |
3189 | else if (TREE_CODE (type) == UNION_TYPE) | |
3190 | { | |
3191 | tree field; | |
3192 | value = default_function_array_conversion (value); | |
400fbf9f | 3193 | |
3e4093b6 RS |
3194 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
3195 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
132da1a5 | 3196 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) |
3e4093b6 RS |
3197 | break; |
3198 | ||
3199 | if (field) | |
400fbf9f | 3200 | { |
3e4093b6 RS |
3201 | tree t; |
3202 | ||
3203 | if (pedantic) | |
3204 | pedwarn ("ISO C forbids casts to union type"); | |
3205 | t = digest_init (type, | |
3206 | build_constructor (type, | |
3207 | build_tree_list (field, value)), | |
916c5919 | 3208 | true, 0); |
3e4093b6 | 3209 | TREE_CONSTANT (t) = TREE_CONSTANT (value); |
6de9cd9a | 3210 | TREE_INVARIANT (t) = TREE_INVARIANT (value); |
3e4093b6 | 3211 | return t; |
400fbf9f | 3212 | } |
3e4093b6 RS |
3213 | error ("cast to union type from type not present in union"); |
3214 | return error_mark_node; | |
3215 | } | |
3216 | else | |
3217 | { | |
3218 | tree otype, ovalue; | |
400fbf9f | 3219 | |
3e4093b6 RS |
3220 | /* If casting to void, avoid the error that would come |
3221 | from default_conversion in the case of a non-lvalue array. */ | |
3222 | if (type == void_type_node) | |
3223 | return build1 (CONVERT_EXPR, type, value); | |
400fbf9f | 3224 | |
3e4093b6 RS |
3225 | /* Convert functions and arrays to pointers, |
3226 | but don't convert any other types. */ | |
3227 | value = default_function_array_conversion (value); | |
3228 | otype = TREE_TYPE (value); | |
400fbf9f | 3229 | |
3e4093b6 | 3230 | /* Optionally warn about potentially worrisome casts. */ |
770ae6cc | 3231 | |
3e4093b6 RS |
3232 | if (warn_cast_qual |
3233 | && TREE_CODE (type) == POINTER_TYPE | |
3234 | && TREE_CODE (otype) == POINTER_TYPE) | |
3235 | { | |
3236 | tree in_type = type; | |
3237 | tree in_otype = otype; | |
3238 | int added = 0; | |
3239 | int discarded = 0; | |
400fbf9f | 3240 | |
3e4093b6 RS |
3241 | /* Check that the qualifiers on IN_TYPE are a superset of |
3242 | the qualifiers of IN_OTYPE. The outermost level of | |
3243 | POINTER_TYPE nodes is uninteresting and we stop as soon | |
3244 | as we hit a non-POINTER_TYPE node on either type. */ | |
3245 | do | |
3246 | { | |
3247 | in_otype = TREE_TYPE (in_otype); | |
3248 | in_type = TREE_TYPE (in_type); | |
400fbf9f | 3249 | |
3e4093b6 RS |
3250 | /* GNU C allows cv-qualified function types. 'const' |
3251 | means the function is very pure, 'volatile' means it | |
3252 | can't return. We need to warn when such qualifiers | |
3253 | are added, not when they're taken away. */ | |
3254 | if (TREE_CODE (in_otype) == FUNCTION_TYPE | |
3255 | && TREE_CODE (in_type) == FUNCTION_TYPE) | |
3256 | added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype)); | |
3257 | else | |
3258 | discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type)); | |
3259 | } | |
3260 | while (TREE_CODE (in_type) == POINTER_TYPE | |
3261 | && TREE_CODE (in_otype) == POINTER_TYPE); | |
400fbf9f | 3262 | |
3e4093b6 | 3263 | if (added) |
d4ee4d25 | 3264 | warning (0, "cast adds new qualifiers to function type"); |
400fbf9f | 3265 | |
3e4093b6 RS |
3266 | if (discarded) |
3267 | /* There are qualifiers present in IN_OTYPE that are not | |
3268 | present in IN_TYPE. */ | |
d4ee4d25 | 3269 | warning (0, "cast discards qualifiers from pointer target type"); |
3e4093b6 | 3270 | } |
400fbf9f | 3271 | |
3e4093b6 RS |
3272 | /* Warn about possible alignment problems. */ |
3273 | if (STRICT_ALIGNMENT && warn_cast_align | |
3274 | && TREE_CODE (type) == POINTER_TYPE | |
3275 | && TREE_CODE (otype) == POINTER_TYPE | |
3276 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3277 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
3278 | /* Don't warn about opaque types, where the actual alignment | |
3279 | restriction is unknown. */ | |
3280 | && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE | |
3281 | || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE) | |
3282 | && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode) | |
3283 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
d4ee4d25 | 3284 | warning (0, "cast increases required alignment of target type"); |
e9a25f70 | 3285 | |
53a2494e JM |
3286 | if (warn_pointer_to_int_cast |
3287 | && TREE_CODE (type) == INTEGER_TYPE | |
3e4093b6 RS |
3288 | && TREE_CODE (otype) == POINTER_TYPE |
3289 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
3290 | && !TREE_CONSTANT (value)) | |
d4ee4d25 | 3291 | warning (0, "cast from pointer to integer of different size"); |
400fbf9f | 3292 | |
3e4093b6 RS |
3293 | if (warn_bad_function_cast |
3294 | && TREE_CODE (value) == CALL_EXPR | |
3295 | && TREE_CODE (type) != TREE_CODE (otype)) | |
d4ee4d25 | 3296 | warning (0, "cast from function call of type %qT to non-matching " |
ff80e49f | 3297 | "type %qT", otype, type); |
400fbf9f | 3298 | |
53a2494e JM |
3299 | if (warn_int_to_pointer_cast |
3300 | && TREE_CODE (type) == POINTER_TYPE | |
3e4093b6 RS |
3301 | && TREE_CODE (otype) == INTEGER_TYPE |
3302 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
3303 | /* Don't warn about converting any constant. */ | |
3304 | && !TREE_CONSTANT (value)) | |
d4ee4d25 | 3305 | warning (0, "cast to pointer from integer of different size"); |
400fbf9f | 3306 | |
3e4093b6 RS |
3307 | if (TREE_CODE (type) == POINTER_TYPE |
3308 | && TREE_CODE (otype) == POINTER_TYPE | |
3309 | && TREE_CODE (expr) == ADDR_EXPR | |
3310 | && DECL_P (TREE_OPERAND (expr, 0)) | |
3311 | && flag_strict_aliasing && warn_strict_aliasing | |
3312 | && !VOID_TYPE_P (TREE_TYPE (type))) | |
3313 | { | |
3314 | /* Casting the address of a decl to non void pointer. Warn | |
3315 | if the cast breaks type based aliasing. */ | |
3316 | if (!COMPLETE_TYPE_P (TREE_TYPE (type))) | |
d4ee4d25 | 3317 | warning (0, "type-punning to incomplete type might break strict-aliasing rules"); |
5399d643 JW |
3318 | else |
3319 | { | |
3320 | HOST_WIDE_INT set1 = get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))); | |
3321 | HOST_WIDE_INT set2 = get_alias_set (TREE_TYPE (type)); | |
3322 | ||
3323 | if (!alias_sets_conflict_p (set1, set2)) | |
d4ee4d25 | 3324 | warning (0, "dereferencing type-punned pointer will break strict-aliasing rules"); |
5399d643 JW |
3325 | else if (warn_strict_aliasing > 1 |
3326 | && !alias_sets_might_conflict_p (set1, set2)) | |
d4ee4d25 | 3327 | warning (0, "dereferencing type-punned pointer might break strict-aliasing rules"); |
5399d643 | 3328 | } |
3e4093b6 | 3329 | } |
400fbf9f | 3330 | |
3897f229 JM |
3331 | /* If pedantic, warn for conversions between function and object |
3332 | pointer types, except for converting a null pointer constant | |
3333 | to function pointer type. */ | |
3334 | if (pedantic | |
3335 | && TREE_CODE (type) == POINTER_TYPE | |
3336 | && TREE_CODE (otype) == POINTER_TYPE | |
3337 | && TREE_CODE (TREE_TYPE (otype)) == FUNCTION_TYPE | |
3338 | && TREE_CODE (TREE_TYPE (type)) != FUNCTION_TYPE) | |
3339 | pedwarn ("ISO C forbids conversion of function pointer to object pointer type"); | |
3340 | ||
3341 | if (pedantic | |
3342 | && TREE_CODE (type) == POINTER_TYPE | |
3343 | && TREE_CODE (otype) == POINTER_TYPE | |
3344 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE | |
3345 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
3346 | && !(integer_zerop (value) && TREE_TYPE (otype) == void_type_node | |
3347 | && TREE_CODE (expr) != NOP_EXPR)) | |
3348 | pedwarn ("ISO C forbids conversion of object pointer to function pointer type"); | |
3349 | ||
3e4093b6 | 3350 | ovalue = value; |
3e4093b6 | 3351 | value = convert (type, value); |
400fbf9f | 3352 | |
3e4093b6 RS |
3353 | /* Ignore any integer overflow caused by the cast. */ |
3354 | if (TREE_CODE (value) == INTEGER_CST) | |
3355 | { | |
092313ae | 3356 | if (EXPR_P (ovalue)) |
89b0433e NS |
3357 | /* If OVALUE had overflow set, then so will VALUE, so it |
3358 | is safe to overwrite. */ | |
092313ae NS |
3359 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); |
3360 | else | |
3361 | TREE_OVERFLOW (value) = 0; | |
3362 | ||
6615c446 | 3363 | if (CONSTANT_CLASS_P (ovalue)) |
89b0433e NS |
3364 | /* Similarly, constant_overflow cannot have become |
3365 | cleared. */ | |
22421b79 | 3366 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); |
3e4093b6 RS |
3367 | } |
3368 | } | |
400fbf9f | 3369 | |
53cd18ec JM |
3370 | /* Don't let a cast be an lvalue. */ |
3371 | if (value == expr) | |
3e4093b6 | 3372 | value = non_lvalue (value); |
e9a25f70 | 3373 | |
3e4093b6 | 3374 | return value; |
400fbf9f JW |
3375 | } |
3376 | ||
3e4093b6 RS |
3377 | /* Interpret a cast of expression EXPR to type TYPE. */ |
3378 | tree | |
f8893e47 | 3379 | c_cast_expr (struct c_type_name *type_name, tree expr) |
400fbf9f | 3380 | { |
f8893e47 | 3381 | tree type; |
3e4093b6 | 3382 | int saved_wsp = warn_strict_prototypes; |
c5c76735 | 3383 | |
3e4093b6 RS |
3384 | /* This avoids warnings about unprototyped casts on |
3385 | integers. E.g. "#define SIG_DFL (void(*)())0". */ | |
3386 | if (TREE_CODE (expr) == INTEGER_CST) | |
3387 | warn_strict_prototypes = 0; | |
f8893e47 | 3388 | type = groktypename (type_name); |
3e4093b6 | 3389 | warn_strict_prototypes = saved_wsp; |
c5c76735 | 3390 | |
3e4093b6 | 3391 | return build_c_cast (type, expr); |
400fbf9f JW |
3392 | } |
3393 | ||
3e4093b6 RS |
3394 | \f |
3395 | /* Build an assignment expression of lvalue LHS from value RHS. | |
3396 | MODIFYCODE is the code for a binary operator that we use | |
3397 | to combine the old value of LHS with RHS to get the new value. | |
3398 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
2f6e4e97 | 3399 | |
3e4093b6 RS |
3400 | tree |
3401 | build_modify_expr (tree lhs, enum tree_code modifycode, tree rhs) | |
400fbf9f | 3402 | { |
3e4093b6 RS |
3403 | tree result; |
3404 | tree newrhs; | |
3405 | tree lhstype = TREE_TYPE (lhs); | |
3406 | tree olhstype = lhstype; | |
e9a25f70 | 3407 | |
3e4093b6 RS |
3408 | /* Types that aren't fully specified cannot be used in assignments. */ |
3409 | lhs = require_complete_type (lhs); | |
e9a25f70 | 3410 | |
3e4093b6 RS |
3411 | /* Avoid duplicate error messages from operands that had errors. */ |
3412 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
3413 | return error_mark_node; | |
400fbf9f | 3414 | |
ed248cf7 | 3415 | STRIP_TYPE_NOPS (rhs); |
e9a25f70 | 3416 | |
3e4093b6 | 3417 | newrhs = rhs; |
400fbf9f | 3418 | |
3e4093b6 RS |
3419 | /* If a binary op has been requested, combine the old LHS value with the RHS |
3420 | producing the value we should actually store into the LHS. */ | |
3421 | ||
3422 | if (modifycode != NOP_EXPR) | |
400fbf9f | 3423 | { |
3e4093b6 RS |
3424 | lhs = stabilize_reference (lhs); |
3425 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
400fbf9f | 3426 | } |
400fbf9f | 3427 | |
9bf24266 | 3428 | if (!lvalue_or_else (lhs, lv_assign)) |
3e4093b6 | 3429 | return error_mark_node; |
400fbf9f | 3430 | |
9bf24266 | 3431 | /* Give an error for storing in something that is 'const'. */ |
bbbd6700 | 3432 | |
3e4093b6 RS |
3433 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) |
3434 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
3435 | || TREE_CODE (lhstype) == UNION_TYPE) | |
3436 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
9bf24266 | 3437 | readonly_error (lhs, lv_assign); |
bbbd6700 | 3438 | |
3e4093b6 RS |
3439 | /* If storing into a structure or union member, |
3440 | it has probably been given type `int'. | |
3441 | Compute the type that would go with | |
3442 | the actual amount of storage the member occupies. */ | |
bbbd6700 | 3443 | |
3e4093b6 RS |
3444 | if (TREE_CODE (lhs) == COMPONENT_REF |
3445 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
3446 | || TREE_CODE (lhstype) == BOOLEAN_TYPE | |
3447 | || TREE_CODE (lhstype) == REAL_TYPE | |
3448 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
3449 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
400fbf9f | 3450 | |
3e4093b6 RS |
3451 | /* If storing in a field that is in actuality a short or narrower than one, |
3452 | we must store in the field in its actual type. */ | |
3453 | ||
3454 | if (lhstype != TREE_TYPE (lhs)) | |
3455 | { | |
3456 | lhs = copy_node (lhs); | |
3457 | TREE_TYPE (lhs) = lhstype; | |
400fbf9f | 3458 | } |
400fbf9f | 3459 | |
3e4093b6 | 3460 | /* Convert new value to destination type. */ |
400fbf9f | 3461 | |
2ac2f164 | 3462 | newrhs = convert_for_assignment (lhstype, newrhs, ic_assign, |
3e4093b6 RS |
3463 | NULL_TREE, NULL_TREE, 0); |
3464 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
3465 | return error_mark_node; | |
400fbf9f | 3466 | |
6e955430 ZL |
3467 | /* Emit ObjC write barrier, if necessary. */ |
3468 | if (c_dialect_objc () && flag_objc_gc) | |
3469 | { | |
3470 | result = objc_generate_write_barrier (lhs, modifycode, newrhs); | |
3471 | if (result) | |
3472 | return result; | |
3473 | } | |
3474 | ||
ea4b7848 | 3475 | /* Scan operands. */ |
400fbf9f | 3476 | |
53fb4de3 | 3477 | result = build2 (MODIFY_EXPR, lhstype, lhs, newrhs); |
3e4093b6 | 3478 | TREE_SIDE_EFFECTS (result) = 1; |
400fbf9f | 3479 | |
3e4093b6 RS |
3480 | /* If we got the LHS in a different type for storing in, |
3481 | convert the result back to the nominal type of LHS | |
3482 | so that the value we return always has the same type | |
3483 | as the LHS argument. */ | |
e855c5ce | 3484 | |
3e4093b6 RS |
3485 | if (olhstype == TREE_TYPE (result)) |
3486 | return result; | |
2ac2f164 | 3487 | return convert_for_assignment (olhstype, result, ic_assign, |
3e4093b6 RS |
3488 | NULL_TREE, NULL_TREE, 0); |
3489 | } | |
3490 | \f | |
3491 | /* Convert value RHS to type TYPE as preparation for an assignment | |
3492 | to an lvalue of type TYPE. | |
3493 | The real work of conversion is done by `convert'. | |
3494 | The purpose of this function is to generate error messages | |
3495 | for assignments that are not allowed in C. | |
2ac2f164 JM |
3496 | ERRTYPE says whether it is argument passing, assignment, |
3497 | initialization or return. | |
2f6e4e97 | 3498 | |
2ac2f164 | 3499 | FUNCTION is a tree for the function being called. |
3e4093b6 | 3500 | PARMNUM is the number of the argument, for printing in error messages. */ |
cb3ca04e | 3501 | |
3e4093b6 | 3502 | static tree |
2ac2f164 JM |
3503 | convert_for_assignment (tree type, tree rhs, enum impl_conv errtype, |
3504 | tree fundecl, tree function, int parmnum) | |
3e4093b6 RS |
3505 | { |
3506 | enum tree_code codel = TREE_CODE (type); | |
3507 | tree rhstype; | |
3508 | enum tree_code coder; | |
2ac2f164 | 3509 | tree rname = NULL_TREE; |
58393038 | 3510 | bool objc_ok = false; |
2ac2f164 | 3511 | |
6dcc04b0 | 3512 | if (errtype == ic_argpass || errtype == ic_argpass_nonproto) |
2ac2f164 JM |
3513 | { |
3514 | tree selector; | |
3515 | /* Change pointer to function to the function itself for | |
3516 | diagnostics. */ | |
3517 | if (TREE_CODE (function) == ADDR_EXPR | |
3518 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL) | |
3519 | function = TREE_OPERAND (function, 0); | |
3520 | ||
3521 | /* Handle an ObjC selector specially for diagnostics. */ | |
3522 | selector = objc_message_selector (); | |
3523 | rname = function; | |
3524 | if (selector && parmnum > 2) | |
3525 | { | |
3526 | rname = selector; | |
3527 | parmnum -= 2; | |
3528 | } | |
3529 | } | |
3530 | ||
3531 | /* This macro is used to emit diagnostics to ensure that all format | |
3532 | strings are complete sentences, visible to gettext and checked at | |
3533 | compile time. */ | |
3534 | #define WARN_FOR_ASSIGNMENT(AR, AS, IN, RE) \ | |
3535 | do { \ | |
3536 | switch (errtype) \ | |
3537 | { \ | |
3538 | case ic_argpass: \ | |
3539 | pedwarn (AR, parmnum, rname); \ | |
3540 | break; \ | |
6dcc04b0 | 3541 | case ic_argpass_nonproto: \ |
d4ee4d25 | 3542 | warning (0, AR, parmnum, rname); \ |
6dcc04b0 | 3543 | break; \ |
2ac2f164 JM |
3544 | case ic_assign: \ |
3545 | pedwarn (AS); \ | |
3546 | break; \ | |
3547 | case ic_init: \ | |
3548 | pedwarn (IN); \ | |
3549 | break; \ | |
3550 | case ic_return: \ | |
3551 | pedwarn (RE); \ | |
3552 | break; \ | |
3553 | default: \ | |
3554 | gcc_unreachable (); \ | |
3555 | } \ | |
3556 | } while (0) | |
cb3ca04e | 3557 | |
ed248cf7 | 3558 | STRIP_TYPE_NOPS (rhs); |
3e4093b6 RS |
3559 | |
3560 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
3561 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE) | |
3562 | rhs = default_conversion (rhs); | |
3563 | else if (optimize && TREE_CODE (rhs) == VAR_DECL) | |
3564 | rhs = decl_constant_value_for_broken_optimization (rhs); | |
3565 | ||
3566 | rhstype = TREE_TYPE (rhs); | |
3567 | coder = TREE_CODE (rhstype); | |
3568 | ||
3569 | if (coder == ERROR_MARK) | |
3570 | return error_mark_node; | |
3571 | ||
58393038 ZL |
3572 | if (c_dialect_objc ()) |
3573 | { | |
3574 | int parmno; | |
3575 | ||
3576 | switch (errtype) | |
3577 | { | |
3578 | case ic_return: | |
3579 | parmno = 0; | |
3580 | break; | |
3581 | ||
3582 | case ic_assign: | |
3583 | parmno = -1; | |
3584 | break; | |
3585 | ||
3586 | case ic_init: | |
3587 | parmno = -2; | |
3588 | break; | |
3589 | ||
3590 | default: | |
3591 | parmno = parmnum; | |
3592 | break; | |
3593 | } | |
3594 | ||
3595 | objc_ok = objc_compare_types (type, rhstype, parmno, rname); | |
3596 | } | |
3597 | ||
3e4093b6 | 3598 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) |
400fbf9f | 3599 | { |
3e4093b6 | 3600 | overflow_warning (rhs); |
3e4093b6 | 3601 | return rhs; |
400fbf9f | 3602 | } |
3e4093b6 RS |
3603 | |
3604 | if (coder == VOID_TYPE) | |
400fbf9f | 3605 | { |
6dcc04b0 JM |
3606 | /* Except for passing an argument to an unprototyped function, |
3607 | this is a constraint violation. When passing an argument to | |
3608 | an unprototyped function, it is compile-time undefined; | |
3609 | making it a constraint in that case was rejected in | |
3610 | DR#252. */ | |
3e4093b6 RS |
3611 | error ("void value not ignored as it ought to be"); |
3612 | return error_mark_node; | |
400fbf9f | 3613 | } |
3e4093b6 RS |
3614 | /* A type converts to a reference to it. |
3615 | This code doesn't fully support references, it's just for the | |
3616 | special case of va_start and va_copy. */ | |
3617 | if (codel == REFERENCE_TYPE | |
132da1a5 | 3618 | && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1) |
400fbf9f | 3619 | { |
3e4093b6 | 3620 | if (!lvalue_p (rhs)) |
400fbf9f | 3621 | { |
3e4093b6 RS |
3622 | error ("cannot pass rvalue to reference parameter"); |
3623 | return error_mark_node; | |
400fbf9f | 3624 | } |
3e4093b6 RS |
3625 | if (!c_mark_addressable (rhs)) |
3626 | return error_mark_node; | |
3627 | rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs); | |
3628 | ||
3629 | /* We already know that these two types are compatible, but they | |
3630 | may not be exactly identical. In fact, `TREE_TYPE (type)' is | |
3631 | likely to be __builtin_va_list and `TREE_TYPE (rhs)' is | |
3632 | likely to be va_list, a typedef to __builtin_va_list, which | |
3633 | is different enough that it will cause problems later. */ | |
3634 | if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type)) | |
3635 | rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs); | |
3636 | ||
3637 | rhs = build1 (NOP_EXPR, type, rhs); | |
3638 | return rhs; | |
400fbf9f | 3639 | } |
3e4093b6 | 3640 | /* Some types can interconvert without explicit casts. */ |
3274deff | 3641 | else if (codel == VECTOR_TYPE && coder == VECTOR_TYPE |
cc27e657 | 3642 | && vector_types_convertible_p (type, TREE_TYPE (rhs))) |
3e4093b6 RS |
3643 | return convert (type, rhs); |
3644 | /* Arithmetic types all interconvert, and enum is treated like int. */ | |
3645 | else if ((codel == INTEGER_TYPE || codel == REAL_TYPE | |
3646 | || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE | |
3647 | || codel == BOOLEAN_TYPE) | |
3648 | && (coder == INTEGER_TYPE || coder == REAL_TYPE | |
3649 | || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE | |
3650 | || coder == BOOLEAN_TYPE)) | |
3651 | return convert_and_check (type, rhs); | |
400fbf9f | 3652 | |
3e4093b6 RS |
3653 | /* Conversion to a transparent union from its member types. |
3654 | This applies only to function arguments. */ | |
2ac2f164 | 3655 | else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) |
6dcc04b0 | 3656 | && (errtype == ic_argpass || errtype == ic_argpass_nonproto)) |
400fbf9f | 3657 | { |
3e4093b6 RS |
3658 | tree memb_types; |
3659 | tree marginal_memb_type = 0; | |
3660 | ||
3661 | for (memb_types = TYPE_FIELDS (type); memb_types; | |
3662 | memb_types = TREE_CHAIN (memb_types)) | |
400fbf9f | 3663 | { |
3e4093b6 | 3664 | tree memb_type = TREE_TYPE (memb_types); |
400fbf9f | 3665 | |
3e4093b6 | 3666 | if (comptypes (TYPE_MAIN_VARIANT (memb_type), |
132da1a5 | 3667 | TYPE_MAIN_VARIANT (rhstype))) |
3e4093b6 | 3668 | break; |
e58cd767 | 3669 | |
3e4093b6 RS |
3670 | if (TREE_CODE (memb_type) != POINTER_TYPE) |
3671 | continue; | |
2f6e4e97 | 3672 | |
3e4093b6 RS |
3673 | if (coder == POINTER_TYPE) |
3674 | { | |
3675 | tree ttl = TREE_TYPE (memb_type); | |
3676 | tree ttr = TREE_TYPE (rhstype); | |
400fbf9f | 3677 | |
3e4093b6 RS |
3678 | /* Any non-function converts to a [const][volatile] void * |
3679 | and vice versa; otherwise, targets must be the same. | |
3680 | Meanwhile, the lhs target must have all the qualifiers of | |
3681 | the rhs. */ | |
3682 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
58393038 | 3683 | || comp_target_types (memb_type, rhstype)) |
3e4093b6 RS |
3684 | { |
3685 | /* If this type won't generate any warnings, use it. */ | |
3686 | if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr) | |
3687 | || ((TREE_CODE (ttr) == FUNCTION_TYPE | |
3688 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
3689 | ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) | |
3690 | == TYPE_QUALS (ttr)) | |
3691 | : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) | |
3692 | == TYPE_QUALS (ttl)))) | |
3693 | break; | |
400fbf9f | 3694 | |
3e4093b6 | 3695 | /* Keep looking for a better type, but remember this one. */ |
3f75a254 | 3696 | if (!marginal_memb_type) |
3e4093b6 RS |
3697 | marginal_memb_type = memb_type; |
3698 | } | |
3699 | } | |
82bde854 | 3700 | |
3e4093b6 RS |
3701 | /* Can convert integer zero to any pointer type. */ |
3702 | if (integer_zerop (rhs) | |
3703 | || (TREE_CODE (rhs) == NOP_EXPR | |
3704 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
3705 | { | |
3706 | rhs = null_pointer_node; | |
3707 | break; | |
3708 | } | |
3709 | } | |
400fbf9f | 3710 | |
3e4093b6 RS |
3711 | if (memb_types || marginal_memb_type) |
3712 | { | |
3f75a254 | 3713 | if (!memb_types) |
3e4093b6 RS |
3714 | { |
3715 | /* We have only a marginally acceptable member type; | |
3716 | it needs a warning. */ | |
3717 | tree ttl = TREE_TYPE (marginal_memb_type); | |
3718 | tree ttr = TREE_TYPE (rhstype); | |
714a0864 | 3719 | |
3e4093b6 RS |
3720 | /* Const and volatile mean something different for function |
3721 | types, so the usual warnings are not appropriate. */ | |
3722 | if (TREE_CODE (ttr) == FUNCTION_TYPE | |
3723 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
3724 | { | |
3725 | /* Because const and volatile on functions are | |
3726 | restrictions that say the function will not do | |
3727 | certain things, it is okay to use a const or volatile | |
3728 | function where an ordinary one is wanted, but not | |
3729 | vice-versa. */ | |
3730 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) | |
2ac2f164 JM |
3731 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE " |
3732 | "makes qualified function " | |
3733 | "pointer from unqualified"), | |
3734 | N_("assignment makes qualified " | |
3735 | "function pointer from " | |
3736 | "unqualified"), | |
3737 | N_("initialization makes qualified " | |
3738 | "function pointer from " | |
3739 | "unqualified"), | |
3740 | N_("return makes qualified function " | |
3741 | "pointer from unqualified")); | |
3e4093b6 RS |
3742 | } |
3743 | else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) | |
2ac2f164 JM |
3744 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE discards " |
3745 | "qualifiers from pointer target type"), | |
3746 | N_("assignment discards qualifiers " | |
3747 | "from pointer target type"), | |
3748 | N_("initialization discards qualifiers " | |
3749 | "from pointer target type"), | |
3750 | N_("return discards qualifiers from " | |
3751 | "pointer target type")); | |
3e4093b6 | 3752 | } |
400fbf9f | 3753 | |
3f75a254 | 3754 | if (pedantic && !DECL_IN_SYSTEM_HEADER (fundecl)) |
3e4093b6 | 3755 | pedwarn ("ISO C prohibits argument conversion to union type"); |
0e7c47fa | 3756 | |
3e4093b6 RS |
3757 | return build1 (NOP_EXPR, type, rhs); |
3758 | } | |
0e7c47fa RK |
3759 | } |
3760 | ||
3e4093b6 RS |
3761 | /* Conversions among pointers */ |
3762 | else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE) | |
3763 | && (coder == codel)) | |
400fbf9f | 3764 | { |
3e4093b6 RS |
3765 | tree ttl = TREE_TYPE (type); |
3766 | tree ttr = TREE_TYPE (rhstype); | |
46df2823 JM |
3767 | tree mvl = ttl; |
3768 | tree mvr = ttr; | |
3e4093b6 | 3769 | bool is_opaque_pointer; |
264fa2db | 3770 | int target_cmp = 0; /* Cache comp_target_types () result. */ |
400fbf9f | 3771 | |
46df2823 JM |
3772 | if (TREE_CODE (mvl) != ARRAY_TYPE) |
3773 | mvl = TYPE_MAIN_VARIANT (mvl); | |
3774 | if (TREE_CODE (mvr) != ARRAY_TYPE) | |
3775 | mvr = TYPE_MAIN_VARIANT (mvr); | |
3e4093b6 | 3776 | /* Opaque pointers are treated like void pointers. */ |
5fd9b178 KH |
3777 | is_opaque_pointer = (targetm.vector_opaque_p (type) |
3778 | || targetm.vector_opaque_p (rhstype)) | |
3e4093b6 RS |
3779 | && TREE_CODE (ttl) == VECTOR_TYPE |
3780 | && TREE_CODE (ttr) == VECTOR_TYPE; | |
400fbf9f | 3781 | |
3e4093b6 RS |
3782 | /* Any non-function converts to a [const][volatile] void * |
3783 | and vice versa; otherwise, targets must be the same. | |
3784 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
3785 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
58393038 | 3786 | || (target_cmp = comp_target_types (type, rhstype)) |
3e4093b6 | 3787 | || is_opaque_pointer |
46df2823 JM |
3788 | || (c_common_unsigned_type (mvl) |
3789 | == c_common_unsigned_type (mvr))) | |
3e4093b6 RS |
3790 | { |
3791 | if (pedantic | |
3792 | && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE) | |
3793 | || | |
3794 | (VOID_TYPE_P (ttr) | |
3795 | /* Check TREE_CODE to catch cases like (void *) (char *) 0 | |
3796 | which are not ANSI null ptr constants. */ | |
3797 | && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR) | |
3798 | && TREE_CODE (ttl) == FUNCTION_TYPE))) | |
2ac2f164 JM |
3799 | WARN_FOR_ASSIGNMENT (N_("ISO C forbids passing argument %d of " |
3800 | "%qE between function pointer " | |
3801 | "and %<void *%>"), | |
3802 | N_("ISO C forbids assignment between " | |
3803 | "function pointer and %<void *%>"), | |
3804 | N_("ISO C forbids initialization between " | |
3805 | "function pointer and %<void *%>"), | |
3806 | N_("ISO C forbids return between function " | |
3807 | "pointer and %<void *%>")); | |
3e4093b6 RS |
3808 | /* Const and volatile mean something different for function types, |
3809 | so the usual warnings are not appropriate. */ | |
3810 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
3811 | && TREE_CODE (ttl) != FUNCTION_TYPE) | |
3812 | { | |
3813 | if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) | |
58393038 ZL |
3814 | { |
3815 | /* Types differing only by the presence of the 'volatile' | |
3816 | qualifier are acceptable if the 'volatile' has been added | |
3817 | in by the Objective-C EH machinery. */ | |
3818 | if (!objc_type_quals_match (ttl, ttr)) | |
3819 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE discards " | |
3820 | "qualifiers from pointer target type"), | |
3821 | N_("assignment discards qualifiers " | |
3822 | "from pointer target type"), | |
3823 | N_("initialization discards qualifiers " | |
3824 | "from pointer target type"), | |
3825 | N_("return discards qualifiers from " | |
3826 | "pointer target type")); | |
3827 | } | |
3e4093b6 RS |
3828 | /* If this is not a case of ignoring a mismatch in signedness, |
3829 | no warning. */ | |
3830 | else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) | |
264fa2db | 3831 | || target_cmp) |
3e4093b6 RS |
3832 | ; |
3833 | /* If there is a mismatch, do warn. */ | |
f2fd3821 | 3834 | else if (warn_pointer_sign) |
2ac2f164 JM |
3835 | WARN_FOR_ASSIGNMENT (N_("pointer targets in passing argument " |
3836 | "%d of %qE differ in signedness"), | |
3837 | N_("pointer targets in assignment " | |
3838 | "differ in signedness"), | |
3839 | N_("pointer targets in initialization " | |
3840 | "differ in signedness"), | |
3841 | N_("pointer targets in return differ " | |
3842 | "in signedness")); | |
3e4093b6 RS |
3843 | } |
3844 | else if (TREE_CODE (ttl) == FUNCTION_TYPE | |
3845 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
3846 | { | |
3847 | /* Because const and volatile on functions are restrictions | |
3848 | that say the function will not do certain things, | |
3849 | it is okay to use a const or volatile function | |
3850 | where an ordinary one is wanted, but not vice-versa. */ | |
3851 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) | |
2ac2f164 JM |
3852 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE makes " |
3853 | "qualified function pointer " | |
3854 | "from unqualified"), | |
3855 | N_("assignment makes qualified function " | |
3856 | "pointer from unqualified"), | |
3857 | N_("initialization makes qualified " | |
3858 | "function pointer from unqualified"), | |
3859 | N_("return makes qualified function " | |
3860 | "pointer from unqualified")); | |
3e4093b6 RS |
3861 | } |
3862 | } | |
3863 | else | |
58393038 ZL |
3864 | /* Avoid warning about the volatile ObjC EH puts on decls. */ |
3865 | if (!objc_ok) | |
3866 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE from " | |
3867 | "incompatible pointer type"), | |
3868 | N_("assignment from incompatible pointer type"), | |
3869 | N_("initialization from incompatible " | |
3870 | "pointer type"), | |
3871 | N_("return from incompatible pointer type")); | |
3872 | ||
3e4093b6 RS |
3873 | return convert (type, rhs); |
3874 | } | |
b494fd98 EB |
3875 | else if (codel == POINTER_TYPE && coder == ARRAY_TYPE) |
3876 | { | |
6dcc04b0 JM |
3877 | /* ??? This should not be an error when inlining calls to |
3878 | unprototyped functions. */ | |
b494fd98 EB |
3879 | error ("invalid use of non-lvalue array"); |
3880 | return error_mark_node; | |
3881 | } | |
3e4093b6 | 3882 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) |
400fbf9f | 3883 | { |
3e4093b6 RS |
3884 | /* An explicit constant 0 can convert to a pointer, |
3885 | or one that results from arithmetic, even including | |
3886 | a cast to integer type. */ | |
3f75a254 | 3887 | if (!(TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs)) |
3e4093b6 | 3888 | && |
3f75a254 JM |
3889 | !(TREE_CODE (rhs) == NOP_EXPR |
3890 | && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE | |
3891 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST | |
3892 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
2ac2f164 JM |
3893 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE makes " |
3894 | "pointer from integer without a cast"), | |
3895 | N_("assignment makes pointer from integer " | |
3896 | "without a cast"), | |
3897 | N_("initialization makes pointer from " | |
3898 | "integer without a cast"), | |
3899 | N_("return makes pointer from integer " | |
3900 | "without a cast")); | |
b3006337 EB |
3901 | |
3902 | return convert (type, rhs); | |
400fbf9f | 3903 | } |
3e4093b6 | 3904 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) |
400fbf9f | 3905 | { |
2ac2f164 JM |
3906 | WARN_FOR_ASSIGNMENT (N_("passing argument %d of %qE makes integer " |
3907 | "from pointer without a cast"), | |
3908 | N_("assignment makes integer from pointer " | |
3909 | "without a cast"), | |
3910 | N_("initialization makes integer from pointer " | |
3911 | "without a cast"), | |
3912 | N_("return makes integer from pointer " | |
3913 | "without a cast")); | |
3e4093b6 RS |
3914 | return convert (type, rhs); |
3915 | } | |
3916 | else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE) | |
3917 | return convert (type, rhs); | |
400fbf9f | 3918 | |
2ac2f164 | 3919 | switch (errtype) |
3e4093b6 | 3920 | { |
2ac2f164 | 3921 | case ic_argpass: |
6dcc04b0 JM |
3922 | case ic_argpass_nonproto: |
3923 | /* ??? This should not be an error when inlining calls to | |
3924 | unprototyped functions. */ | |
2ac2f164 JM |
3925 | error ("incompatible type for argument %d of %qE", parmnum, rname); |
3926 | break; | |
3927 | case ic_assign: | |
3928 | error ("incompatible types in assignment"); | |
3929 | break; | |
3930 | case ic_init: | |
3931 | error ("incompatible types in initialization"); | |
3932 | break; | |
3933 | case ic_return: | |
3934 | error ("incompatible types in return"); | |
3935 | break; | |
3936 | default: | |
3937 | gcc_unreachable (); | |
400fbf9f | 3938 | } |
53b01f59 | 3939 | |
3e4093b6 RS |
3940 | return error_mark_node; |
3941 | } | |
53b01f59 | 3942 | |
d5123bae MS |
3943 | /* Convert VALUE for assignment into inlined parameter PARM. ARGNUM |
3944 | is used for error and waring reporting and indicates which argument | |
3945 | is being processed. */ | |
400fbf9f | 3946 | |
3e4093b6 | 3947 | tree |
d5123bae | 3948 | c_convert_parm_for_inlining (tree parm, tree value, tree fn, int argnum) |
3e4093b6 RS |
3949 | { |
3950 | tree ret, type; | |
400fbf9f | 3951 | |
3e4093b6 RS |
3952 | /* If FN was prototyped, the value has been converted already |
3953 | in convert_arguments. */ | |
3f75a254 | 3954 | if (!value || TYPE_ARG_TYPES (TREE_TYPE (fn))) |
3e4093b6 | 3955 | return value; |
f5963e61 | 3956 | |
3e4093b6 RS |
3957 | type = TREE_TYPE (parm); |
3958 | ret = convert_for_assignment (type, value, | |
6dcc04b0 | 3959 | ic_argpass_nonproto, fn, |
2ac2f164 | 3960 | fn, argnum); |
61f71b34 | 3961 | if (targetm.calls.promote_prototypes (TREE_TYPE (fn)) |
3e4093b6 RS |
3962 | && INTEGRAL_TYPE_P (type) |
3963 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
3964 | ret = default_conversion (ret); | |
3965 | return ret; | |
3966 | } | |
3e4093b6 RS |
3967 | \f |
3968 | /* If VALUE is a compound expr all of whose expressions are constant, then | |
3969 | return its value. Otherwise, return error_mark_node. | |
15b732b2 | 3970 | |
3e4093b6 RS |
3971 | This is for handling COMPOUND_EXPRs as initializer elements |
3972 | which is allowed with a warning when -pedantic is specified. */ | |
15b732b2 | 3973 | |
3e4093b6 RS |
3974 | static tree |
3975 | valid_compound_expr_initializer (tree value, tree endtype) | |
3976 | { | |
3977 | if (TREE_CODE (value) == COMPOUND_EXPR) | |
3978 | { | |
3979 | if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype) | |
3980 | == error_mark_node) | |
3981 | return error_mark_node; | |
3982 | return valid_compound_expr_initializer (TREE_OPERAND (value, 1), | |
3983 | endtype); | |
3984 | } | |
116df786 | 3985 | else if (!initializer_constant_valid_p (value, endtype)) |
3e4093b6 RS |
3986 | return error_mark_node; |
3987 | else | |
3988 | return value; | |
15b732b2 | 3989 | } |
400fbf9f | 3990 | \f |
3e4093b6 RS |
3991 | /* Perform appropriate conversions on the initial value of a variable, |
3992 | store it in the declaration DECL, | |
3993 | and print any error messages that are appropriate. | |
3994 | If the init is invalid, store an ERROR_MARK. */ | |
400fbf9f | 3995 | |
3e4093b6 RS |
3996 | void |
3997 | store_init_value (tree decl, tree init) | |
400fbf9f | 3998 | { |
3e4093b6 | 3999 | tree value, type; |
400fbf9f | 4000 | |
3e4093b6 | 4001 | /* If variable's type was invalidly declared, just ignore it. */ |
400fbf9f | 4002 | |
3e4093b6 RS |
4003 | type = TREE_TYPE (decl); |
4004 | if (TREE_CODE (type) == ERROR_MARK) | |
4005 | return; | |
400fbf9f | 4006 | |
3e4093b6 | 4007 | /* Digest the specified initializer into an expression. */ |
400fbf9f | 4008 | |
916c5919 | 4009 | value = digest_init (type, init, true, TREE_STATIC (decl)); |
400fbf9f | 4010 | |
3e4093b6 | 4011 | /* Store the expression if valid; else report error. */ |
400fbf9f | 4012 | |
3e4093b6 | 4013 | if (warn_traditional && !in_system_header |
3f75a254 | 4014 | && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && !TREE_STATIC (decl)) |
d4ee4d25 | 4015 | warning (0, "traditional C rejects automatic aggregate initialization"); |
2f6e4e97 | 4016 | |
3e4093b6 | 4017 | DECL_INITIAL (decl) = value; |
400fbf9f | 4018 | |
3e4093b6 RS |
4019 | /* ANSI wants warnings about out-of-range constant initializers. */ |
4020 | STRIP_TYPE_NOPS (value); | |
4021 | constant_expression_warning (value); | |
400fbf9f | 4022 | |
3e4093b6 RS |
4023 | /* Check if we need to set array size from compound literal size. */ |
4024 | if (TREE_CODE (type) == ARRAY_TYPE | |
4025 | && TYPE_DOMAIN (type) == 0 | |
4026 | && value != error_mark_node) | |
400fbf9f | 4027 | { |
3e4093b6 RS |
4028 | tree inside_init = init; |
4029 | ||
ed248cf7 | 4030 | STRIP_TYPE_NOPS (inside_init); |
3e4093b6 RS |
4031 | inside_init = fold (inside_init); |
4032 | ||
4033 | if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
4034 | { | |
4035 | tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init); | |
4036 | ||
4037 | if (TYPE_DOMAIN (TREE_TYPE (decl))) | |
4038 | { | |
4039 | /* For int foo[] = (int [3]){1}; we need to set array size | |
4040 | now since later on array initializer will be just the | |
4041 | brace enclosed list of the compound literal. */ | |
4042 | TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (decl)); | |
4043 | layout_type (type); | |
4044 | layout_decl (decl, 0); | |
4045 | } | |
4046 | } | |
400fbf9f | 4047 | } |
3e4093b6 RS |
4048 | } |
4049 | \f | |
4050 | /* Methods for storing and printing names for error messages. */ | |
400fbf9f | 4051 | |
3e4093b6 RS |
4052 | /* Implement a spelling stack that allows components of a name to be pushed |
4053 | and popped. Each element on the stack is this structure. */ | |
400fbf9f | 4054 | |
3e4093b6 RS |
4055 | struct spelling |
4056 | { | |
4057 | int kind; | |
4058 | union | |
400fbf9f | 4059 | { |
3e4093b6 RS |
4060 | int i; |
4061 | const char *s; | |
4062 | } u; | |
4063 | }; | |
2f6e4e97 | 4064 | |
3e4093b6 RS |
4065 | #define SPELLING_STRING 1 |
4066 | #define SPELLING_MEMBER 2 | |
4067 | #define SPELLING_BOUNDS 3 | |
400fbf9f | 4068 | |
3e4093b6 RS |
4069 | static struct spelling *spelling; /* Next stack element (unused). */ |
4070 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4071 | static int spelling_size; /* Size of the spelling stack. */ | |
400fbf9f | 4072 | |
3e4093b6 RS |
4073 | /* Macros to save and restore the spelling stack around push_... functions. |
4074 | Alternative to SAVE_SPELLING_STACK. */ | |
400fbf9f | 4075 | |
3e4093b6 RS |
4076 | #define SPELLING_DEPTH() (spelling - spelling_base) |
4077 | #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH)) | |
400fbf9f | 4078 | |
3e4093b6 RS |
4079 | /* Push an element on the spelling stack with type KIND and assign VALUE |
4080 | to MEMBER. */ | |
400fbf9f | 4081 | |
3e4093b6 RS |
4082 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ |
4083 | { \ | |
4084 | int depth = SPELLING_DEPTH (); \ | |
4085 | \ | |
4086 | if (depth >= spelling_size) \ | |
4087 | { \ | |
4088 | spelling_size += 10; \ | |
cca8ead2 BI |
4089 | spelling_base = XRESIZEVEC (struct spelling, spelling_base, \ |
4090 | spelling_size); \ | |
3e4093b6 RS |
4091 | RESTORE_SPELLING_DEPTH (depth); \ |
4092 | } \ | |
4093 | \ | |
4094 | spelling->kind = (KIND); \ | |
4095 | spelling->MEMBER = (VALUE); \ | |
4096 | spelling++; \ | |
4097 | } | |
400fbf9f | 4098 | |
3e4093b6 | 4099 | /* Push STRING on the stack. Printed literally. */ |
400fbf9f | 4100 | |
3e4093b6 RS |
4101 | static void |
4102 | push_string (const char *string) | |
4103 | { | |
4104 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4105 | } | |
400fbf9f | 4106 | |
3e4093b6 | 4107 | /* Push a member name on the stack. Printed as '.' STRING. */ |
400fbf9f | 4108 | |
3e4093b6 RS |
4109 | static void |
4110 | push_member_name (tree decl) | |
4111 | { | |
4112 | const char *const string | |
4113 | = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>"; | |
4114 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); | |
4115 | } | |
400fbf9f | 4116 | |
3e4093b6 | 4117 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ |
400fbf9f | 4118 | |
3e4093b6 RS |
4119 | static void |
4120 | push_array_bounds (int bounds) | |
4121 | { | |
4122 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4123 | } | |
bb58bec5 | 4124 | |
3e4093b6 | 4125 | /* Compute the maximum size in bytes of the printed spelling. */ |
400fbf9f | 4126 | |
3e4093b6 RS |
4127 | static int |
4128 | spelling_length (void) | |
4129 | { | |
4130 | int size = 0; | |
4131 | struct spelling *p; | |
400fbf9f | 4132 | |
3e4093b6 RS |
4133 | for (p = spelling_base; p < spelling; p++) |
4134 | { | |
4135 | if (p->kind == SPELLING_BOUNDS) | |
4136 | size += 25; | |
4137 | else | |
4138 | size += strlen (p->u.s) + 1; | |
4139 | } | |
4140 | ||
4141 | return size; | |
400fbf9f | 4142 | } |
400fbf9f | 4143 | |
3e4093b6 | 4144 | /* Print the spelling to BUFFER and return it. */ |
400fbf9f | 4145 | |
3e4093b6 RS |
4146 | static char * |
4147 | print_spelling (char *buffer) | |
400fbf9f | 4148 | { |
3e4093b6 RS |
4149 | char *d = buffer; |
4150 | struct spelling *p; | |
400fbf9f | 4151 | |
3e4093b6 RS |
4152 | for (p = spelling_base; p < spelling; p++) |
4153 | if (p->kind == SPELLING_BOUNDS) | |
4154 | { | |
4155 | sprintf (d, "[%d]", p->u.i); | |
4156 | d += strlen (d); | |
4157 | } | |
4158 | else | |
4159 | { | |
4160 | const char *s; | |
4161 | if (p->kind == SPELLING_MEMBER) | |
4162 | *d++ = '.'; | |
4163 | for (s = p->u.s; (*d = *s++); d++) | |
4164 | ; | |
4165 | } | |
4166 | *d++ = '\0'; | |
4167 | return buffer; | |
4168 | } | |
400fbf9f | 4169 | |
3e4093b6 RS |
4170 | /* Issue an error message for a bad initializer component. |
4171 | MSGID identifies the message. | |
4172 | The component name is taken from the spelling stack. */ | |
400fbf9f | 4173 | |
3e4093b6 RS |
4174 | void |
4175 | error_init (const char *msgid) | |
4176 | { | |
4177 | char *ofwhat; | |
400fbf9f | 4178 | |
3e4093b6 | 4179 | error ("%s", _(msgid)); |
28dab132 | 4180 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4181 | if (*ofwhat) |
bda67431 | 4182 | error ("(near initialization for %qs)", ofwhat); |
3e4093b6 | 4183 | } |
400fbf9f | 4184 | |
3e4093b6 RS |
4185 | /* Issue a pedantic warning for a bad initializer component. |
4186 | MSGID identifies the message. | |
4187 | The component name is taken from the spelling stack. */ | |
400fbf9f | 4188 | |
3e4093b6 RS |
4189 | void |
4190 | pedwarn_init (const char *msgid) | |
4191 | { | |
4192 | char *ofwhat; | |
9f720c3e | 4193 | |
3e4093b6 | 4194 | pedwarn ("%s", _(msgid)); |
28dab132 | 4195 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4196 | if (*ofwhat) |
bda67431 | 4197 | pedwarn ("(near initialization for %qs)", ofwhat); |
3e4093b6 | 4198 | } |
9f720c3e | 4199 | |
3e4093b6 RS |
4200 | /* Issue a warning for a bad initializer component. |
4201 | MSGID identifies the message. | |
4202 | The component name is taken from the spelling stack. */ | |
61179109 | 4203 | |
3e4093b6 RS |
4204 | static void |
4205 | warning_init (const char *msgid) | |
4206 | { | |
4207 | char *ofwhat; | |
7e842ef8 | 4208 | |
d4ee4d25 | 4209 | warning (0, "%s", _(msgid)); |
28dab132 | 4210 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
3e4093b6 | 4211 | if (*ofwhat) |
d4ee4d25 | 4212 | warning (0, "(near initialization for %qs)", ofwhat); |
3e4093b6 RS |
4213 | } |
4214 | \f | |
916c5919 JM |
4215 | /* If TYPE is an array type and EXPR is a parenthesized string |
4216 | constant, warn if pedantic that EXPR is being used to initialize an | |
4217 | object of type TYPE. */ | |
4218 | ||
4219 | void | |
4220 | maybe_warn_string_init (tree type, struct c_expr expr) | |
4221 | { | |
4222 | if (pedantic | |
4223 | && TREE_CODE (type) == ARRAY_TYPE | |
4224 | && TREE_CODE (expr.value) == STRING_CST | |
4225 | && expr.original_code != STRING_CST) | |
4226 | pedwarn_init ("array initialized from parenthesized string constant"); | |
4227 | } | |
4228 | ||
3e4093b6 RS |
4229 | /* Digest the parser output INIT as an initializer for type TYPE. |
4230 | Return a C expression of type TYPE to represent the initial value. | |
7e842ef8 | 4231 | |
916c5919 JM |
4232 | If INIT is a string constant, STRICT_STRING is true if it is |
4233 | unparenthesized or we should not warn here for it being parenthesized. | |
4234 | For other types of INIT, STRICT_STRING is not used. | |
4235 | ||
3e4093b6 RS |
4236 | REQUIRE_CONSTANT requests an error if non-constant initializers or |
4237 | elements are seen. */ | |
7e842ef8 | 4238 | |
3e4093b6 | 4239 | static tree |
916c5919 | 4240 | digest_init (tree type, tree init, bool strict_string, int require_constant) |
3e4093b6 RS |
4241 | { |
4242 | enum tree_code code = TREE_CODE (type); | |
4243 | tree inside_init = init; | |
7e842ef8 | 4244 | |
3e4093b6 RS |
4245 | if (type == error_mark_node |
4246 | || init == error_mark_node | |
4247 | || TREE_TYPE (init) == error_mark_node) | |
4248 | return error_mark_node; | |
7e842ef8 | 4249 | |
ed248cf7 | 4250 | STRIP_TYPE_NOPS (inside_init); |
7e842ef8 | 4251 | |
3e4093b6 | 4252 | inside_init = fold (inside_init); |
7e842ef8 | 4253 | |
3e4093b6 RS |
4254 | /* Initialization of an array of chars from a string constant |
4255 | optionally enclosed in braces. */ | |
7e842ef8 | 4256 | |
197463ae JM |
4257 | if (code == ARRAY_TYPE && inside_init |
4258 | && TREE_CODE (inside_init) == STRING_CST) | |
3e4093b6 RS |
4259 | { |
4260 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
197463ae JM |
4261 | /* Note that an array could be both an array of character type |
4262 | and an array of wchar_t if wchar_t is signed char or unsigned | |
4263 | char. */ | |
4264 | bool char_array = (typ1 == char_type_node | |
4265 | || typ1 == signed_char_type_node | |
4266 | || typ1 == unsigned_char_type_node); | |
4267 | bool wchar_array = !!comptypes (typ1, wchar_type_node); | |
4268 | if (char_array || wchar_array) | |
7e842ef8 | 4269 | { |
916c5919 | 4270 | struct c_expr expr; |
197463ae | 4271 | bool char_string; |
916c5919 JM |
4272 | expr.value = inside_init; |
4273 | expr.original_code = (strict_string ? STRING_CST : ERROR_MARK); | |
4274 | maybe_warn_string_init (type, expr); | |
4275 | ||
197463ae JM |
4276 | char_string |
4277 | = (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) | |
4278 | == char_type_node); | |
4279 | ||
3e4093b6 | 4280 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
132da1a5 | 4281 | TYPE_MAIN_VARIANT (type))) |
3e4093b6 | 4282 | return inside_init; |
7e842ef8 | 4283 | |
197463ae | 4284 | if (!wchar_array && !char_string) |
3e4093b6 RS |
4285 | { |
4286 | error_init ("char-array initialized from wide string"); | |
4287 | return error_mark_node; | |
4288 | } | |
197463ae | 4289 | if (char_string && !char_array) |
3e4093b6 | 4290 | { |
197463ae | 4291 | error_init ("wchar_t-array initialized from non-wide string"); |
3e4093b6 | 4292 | return error_mark_node; |
7e842ef8 | 4293 | } |
2f6e4e97 | 4294 | |
3e4093b6 RS |
4295 | TREE_TYPE (inside_init) = type; |
4296 | if (TYPE_DOMAIN (type) != 0 | |
4297 | && TYPE_SIZE (type) != 0 | |
4298 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
4299 | /* Subtract 1 (or sizeof (wchar_t)) | |
4300 | because it's ok to ignore the terminating null char | |
4301 | that is counted in the length of the constant. */ | |
4302 | && 0 > compare_tree_int (TYPE_SIZE_UNIT (type), | |
4303 | TREE_STRING_LENGTH (inside_init) | |
4304 | - ((TYPE_PRECISION (typ1) | |
4305 | != TYPE_PRECISION (char_type_node)) | |
4306 | ? (TYPE_PRECISION (wchar_type_node) | |
4307 | / BITS_PER_UNIT) | |
4308 | : 1))) | |
4309 | pedwarn_init ("initializer-string for array of chars is too long"); | |
7e842ef8 | 4310 | |
3e4093b6 | 4311 | return inside_init; |
7e842ef8 | 4312 | } |
197463ae JM |
4313 | else if (INTEGRAL_TYPE_P (typ1)) |
4314 | { | |
4315 | error_init ("array of inappropriate type initialized " | |
4316 | "from string constant"); | |
4317 | return error_mark_node; | |
4318 | } | |
7e842ef8 PE |
4319 | } |
4320 | ||
3e4093b6 RS |
4321 | /* Build a VECTOR_CST from a *constant* vector constructor. If the |
4322 | vector constructor is not constant (e.g. {1,2,3,foo()}) then punt | |
4323 | below and handle as a constructor. */ | |
e89be13b JJ |
4324 | if (code == VECTOR_TYPE |
4325 | && TREE_CODE (TREE_TYPE (inside_init)) == VECTOR_TYPE | |
4326 | && vector_types_convertible_p (TREE_TYPE (inside_init), type) | |
4327 | && TREE_CONSTANT (inside_init)) | |
4328 | { | |
4329 | if (TREE_CODE (inside_init) == VECTOR_CST | |
4330 | && comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), | |
4331 | TYPE_MAIN_VARIANT (type))) | |
4332 | return inside_init; | |
4333 | ||
4334 | if (TREE_CODE (inside_init) == CONSTRUCTOR) | |
4335 | { | |
4336 | tree link; | |
4337 | ||
4338 | /* Iterate through elements and check if all constructor | |
4339 | elements are *_CSTs. */ | |
4340 | for (link = CONSTRUCTOR_ELTS (inside_init); | |
4341 | link; | |
4342 | link = TREE_CHAIN (link)) | |
4343 | if (! CONSTANT_CLASS_P (TREE_VALUE (link))) | |
4344 | break; | |
4345 | ||
4346 | if (link == NULL) | |
4347 | return build_vector (type, CONSTRUCTOR_ELTS (inside_init)); | |
4348 | } | |
4349 | } | |
6035d635 | 4350 | |
3e4093b6 RS |
4351 | /* Any type can be initialized |
4352 | from an expression of the same type, optionally with braces. */ | |
400fbf9f | 4353 | |
3e4093b6 RS |
4354 | if (inside_init && TREE_TYPE (inside_init) != 0 |
4355 | && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), | |
132da1a5 | 4356 | TYPE_MAIN_VARIANT (type)) |
3e4093b6 | 4357 | || (code == ARRAY_TYPE |
132da1a5 | 4358 | && comptypes (TREE_TYPE (inside_init), type)) |
3e4093b6 | 4359 | || (code == VECTOR_TYPE |
132da1a5 | 4360 | && comptypes (TREE_TYPE (inside_init), type)) |
3e4093b6 | 4361 | || (code == POINTER_TYPE |
3897f229 | 4362 | && TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
3e4093b6 | 4363 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), |
132da1a5 | 4364 | TREE_TYPE (type))) |
3897f229 JM |
4365 | || (code == POINTER_TYPE |
4366 | && TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE | |
4367 | && comptypes (TREE_TYPE (inside_init), | |
132da1a5 | 4368 | TREE_TYPE (type))))) |
3e4093b6 RS |
4369 | { |
4370 | if (code == POINTER_TYPE) | |
b494fd98 EB |
4371 | { |
4372 | inside_init = default_function_array_conversion (inside_init); | |
4373 | ||
4374 | if (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE) | |
4375 | { | |
4376 | error_init ("invalid use of non-lvalue array"); | |
4377 | return error_mark_node; | |
4378 | } | |
4379 | } | |
4380 | ||
bae39a73 NS |
4381 | if (code == VECTOR_TYPE) |
4382 | /* Although the types are compatible, we may require a | |
4383 | conversion. */ | |
4384 | inside_init = convert (type, inside_init); | |
3e4093b6 RS |
4385 | |
4386 | if (require_constant && !flag_isoc99 | |
4387 | && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
400fbf9f | 4388 | { |
3e4093b6 RS |
4389 | /* As an extension, allow initializing objects with static storage |
4390 | duration with compound literals (which are then treated just as | |
4391 | the brace enclosed list they contain). */ | |
4392 | tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init); | |
4393 | inside_init = DECL_INITIAL (decl); | |
400fbf9f | 4394 | } |
3e4093b6 RS |
4395 | |
4396 | if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST | |
4397 | && TREE_CODE (inside_init) != CONSTRUCTOR) | |
400fbf9f | 4398 | { |
3e4093b6 RS |
4399 | error_init ("array initialized from non-constant array expression"); |
4400 | return error_mark_node; | |
400fbf9f | 4401 | } |
400fbf9f | 4402 | |
3e4093b6 RS |
4403 | if (optimize && TREE_CODE (inside_init) == VAR_DECL) |
4404 | inside_init = decl_constant_value_for_broken_optimization (inside_init); | |
2f6e4e97 | 4405 | |
3e4093b6 RS |
4406 | /* Compound expressions can only occur here if -pedantic or |
4407 | -pedantic-errors is specified. In the later case, we always want | |
4408 | an error. In the former case, we simply want a warning. */ | |
4409 | if (require_constant && pedantic | |
4410 | && TREE_CODE (inside_init) == COMPOUND_EXPR) | |
4411 | { | |
4412 | inside_init | |
4413 | = valid_compound_expr_initializer (inside_init, | |
4414 | TREE_TYPE (inside_init)); | |
4415 | if (inside_init == error_mark_node) | |
4416 | error_init ("initializer element is not constant"); | |
2f6e4e97 | 4417 | else |
3e4093b6 RS |
4418 | pedwarn_init ("initializer element is not constant"); |
4419 | if (flag_pedantic_errors) | |
4420 | inside_init = error_mark_node; | |
4421 | } | |
4422 | else if (require_constant | |
116df786 RH |
4423 | && !initializer_constant_valid_p (inside_init, |
4424 | TREE_TYPE (inside_init))) | |
3e4093b6 RS |
4425 | { |
4426 | error_init ("initializer element is not constant"); | |
4427 | inside_init = error_mark_node; | |
8b40563c | 4428 | } |
f735a153 | 4429 | |
3e4093b6 RS |
4430 | return inside_init; |
4431 | } | |
f735a153 | 4432 | |
3e4093b6 | 4433 | /* Handle scalar types, including conversions. */ |
400fbf9f | 4434 | |
3e4093b6 | 4435 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE |
cc27e657 PB |
4436 | || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE |
4437 | || code == VECTOR_TYPE) | |
400fbf9f | 4438 | { |
3e4093b6 RS |
4439 | /* Note that convert_for_assignment calls default_conversion |
4440 | for arrays and functions. We must not call it in the | |
4441 | case where inside_init is a null pointer constant. */ | |
4442 | inside_init | |
2ac2f164 | 4443 | = convert_for_assignment (type, init, ic_init, |
3e4093b6 | 4444 | NULL_TREE, NULL_TREE, 0); |
2f6e4e97 | 4445 | |
3274deff JW |
4446 | /* Check to see if we have already given an error message. */ |
4447 | if (inside_init == error_mark_node) | |
4448 | ; | |
3f75a254 | 4449 | else if (require_constant && !TREE_CONSTANT (inside_init)) |
400fbf9f | 4450 | { |
3e4093b6 RS |
4451 | error_init ("initializer element is not constant"); |
4452 | inside_init = error_mark_node; | |
400fbf9f | 4453 | } |
3e4093b6 | 4454 | else if (require_constant |
116df786 RH |
4455 | && !initializer_constant_valid_p (inside_init, |
4456 | TREE_TYPE (inside_init))) | |
400fbf9f | 4457 | { |
3e4093b6 RS |
4458 | error_init ("initializer element is not computable at load time"); |
4459 | inside_init = error_mark_node; | |
400fbf9f | 4460 | } |
3e4093b6 RS |
4461 | |
4462 | return inside_init; | |
400fbf9f | 4463 | } |
d9fc6069 | 4464 | |
3e4093b6 | 4465 | /* Come here only for records and arrays. */ |
d9fc6069 | 4466 | |
3e4093b6 | 4467 | if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) |
d9fc6069 | 4468 | { |
3e4093b6 RS |
4469 | error_init ("variable-sized object may not be initialized"); |
4470 | return error_mark_node; | |
d9fc6069 | 4471 | } |
3e4093b6 RS |
4472 | |
4473 | error_init ("invalid initializer"); | |
4474 | return error_mark_node; | |
d9fc6069 | 4475 | } |
400fbf9f | 4476 | \f |
3e4093b6 | 4477 | /* Handle initializers that use braces. */ |
400fbf9f | 4478 | |
3e4093b6 RS |
4479 | /* Type of object we are accumulating a constructor for. |
4480 | This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */ | |
4481 | static tree constructor_type; | |
400fbf9f | 4482 | |
3e4093b6 RS |
4483 | /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields |
4484 | left to fill. */ | |
4485 | static tree constructor_fields; | |
400fbf9f | 4486 | |
3e4093b6 RS |
4487 | /* For an ARRAY_TYPE, this is the specified index |
4488 | at which to store the next element we get. */ | |
4489 | static tree constructor_index; | |
400fbf9f | 4490 | |
3e4093b6 RS |
4491 | /* For an ARRAY_TYPE, this is the maximum index. */ |
4492 | static tree constructor_max_index; | |
400fbf9f | 4493 | |
3e4093b6 RS |
4494 | /* For a RECORD_TYPE, this is the first field not yet written out. */ |
4495 | static tree constructor_unfilled_fields; | |
400fbf9f | 4496 | |
3e4093b6 RS |
4497 | /* For an ARRAY_TYPE, this is the index of the first element |
4498 | not yet written out. */ | |
4499 | static tree constructor_unfilled_index; | |
895ea614 | 4500 | |
3e4093b6 RS |
4501 | /* In a RECORD_TYPE, the byte index of the next consecutive field. |
4502 | This is so we can generate gaps between fields, when appropriate. */ | |
4503 | static tree constructor_bit_index; | |
10d5caec | 4504 | |
3e4093b6 RS |
4505 | /* If we are saving up the elements rather than allocating them, |
4506 | this is the list of elements so far (in reverse order, | |
4507 | most recent first). */ | |
4508 | static tree constructor_elements; | |
ad47f1e5 | 4509 | |
3e4093b6 RS |
4510 | /* 1 if constructor should be incrementally stored into a constructor chain, |
4511 | 0 if all the elements should be kept in AVL tree. */ | |
4512 | static int constructor_incremental; | |
ad47f1e5 | 4513 | |
3e4093b6 RS |
4514 | /* 1 if so far this constructor's elements are all compile-time constants. */ |
4515 | static int constructor_constant; | |
ad47f1e5 | 4516 | |
3e4093b6 RS |
4517 | /* 1 if so far this constructor's elements are all valid address constants. */ |
4518 | static int constructor_simple; | |
ad47f1e5 | 4519 | |
3e4093b6 RS |
4520 | /* 1 if this constructor is erroneous so far. */ |
4521 | static int constructor_erroneous; | |
d45cf215 | 4522 | |
3e4093b6 RS |
4523 | /* Structure for managing pending initializer elements, organized as an |
4524 | AVL tree. */ | |
d45cf215 | 4525 | |
3e4093b6 | 4526 | struct init_node |
d45cf215 | 4527 | { |
3e4093b6 RS |
4528 | struct init_node *left, *right; |
4529 | struct init_node *parent; | |
4530 | int balance; | |
4531 | tree purpose; | |
4532 | tree value; | |
d45cf215 RS |
4533 | }; |
4534 | ||
3e4093b6 RS |
4535 | /* Tree of pending elements at this constructor level. |
4536 | These are elements encountered out of order | |
4537 | which belong at places we haven't reached yet in actually | |
4538 | writing the output. | |
4539 | Will never hold tree nodes across GC runs. */ | |
4540 | static struct init_node *constructor_pending_elts; | |
d45cf215 | 4541 | |
3e4093b6 RS |
4542 | /* The SPELLING_DEPTH of this constructor. */ |
4543 | static int constructor_depth; | |
d45cf215 | 4544 | |
3e4093b6 RS |
4545 | /* DECL node for which an initializer is being read. |
4546 | 0 means we are reading a constructor expression | |
4547 | such as (struct foo) {...}. */ | |
4548 | static tree constructor_decl; | |
d45cf215 | 4549 | |
3e4093b6 RS |
4550 | /* Nonzero if this is an initializer for a top-level decl. */ |
4551 | static int constructor_top_level; | |
d45cf215 | 4552 | |
3e4093b6 RS |
4553 | /* Nonzero if there were any member designators in this initializer. */ |
4554 | static int constructor_designated; | |
d45cf215 | 4555 | |
3e4093b6 RS |
4556 | /* Nesting depth of designator list. */ |
4557 | static int designator_depth; | |
d45cf215 | 4558 | |
3e4093b6 RS |
4559 | /* Nonzero if there were diagnosed errors in this designator list. */ |
4560 | static int designator_errorneous; | |
d45cf215 | 4561 | |
3e4093b6 RS |
4562 | \f |
4563 | /* This stack has a level for each implicit or explicit level of | |
4564 | structuring in the initializer, including the outermost one. It | |
4565 | saves the values of most of the variables above. */ | |
d45cf215 | 4566 | |
3e4093b6 RS |
4567 | struct constructor_range_stack; |
4568 | ||
4569 | struct constructor_stack | |
d45cf215 | 4570 | { |
3e4093b6 RS |
4571 | struct constructor_stack *next; |
4572 | tree type; | |
4573 | tree fields; | |
4574 | tree index; | |
4575 | tree max_index; | |
4576 | tree unfilled_index; | |
4577 | tree unfilled_fields; | |
4578 | tree bit_index; | |
4579 | tree elements; | |
4580 | struct init_node *pending_elts; | |
4581 | int offset; | |
4582 | int depth; | |
916c5919 | 4583 | /* If value nonzero, this value should replace the entire |
3e4093b6 | 4584 | constructor at this level. */ |
916c5919 | 4585 | struct c_expr replacement_value; |
3e4093b6 RS |
4586 | struct constructor_range_stack *range_stack; |
4587 | char constant; | |
4588 | char simple; | |
4589 | char implicit; | |
4590 | char erroneous; | |
4591 | char outer; | |
4592 | char incremental; | |
4593 | char designated; | |
4594 | }; | |
d45cf215 | 4595 | |
802415d1 | 4596 | static struct constructor_stack *constructor_stack; |
d45cf215 | 4597 | |
3e4093b6 RS |
4598 | /* This stack represents designators from some range designator up to |
4599 | the last designator in the list. */ | |
d45cf215 | 4600 | |
3e4093b6 RS |
4601 | struct constructor_range_stack |
4602 | { | |
4603 | struct constructor_range_stack *next, *prev; | |
4604 | struct constructor_stack *stack; | |
4605 | tree range_start; | |
4606 | tree index; | |
4607 | tree range_end; | |
4608 | tree fields; | |
4609 | }; | |
d45cf215 | 4610 | |
802415d1 | 4611 | static struct constructor_range_stack *constructor_range_stack; |
d45cf215 | 4612 | |
3e4093b6 RS |
4613 | /* This stack records separate initializers that are nested. |
4614 | Nested initializers can't happen in ANSI C, but GNU C allows them | |
4615 | in cases like { ... (struct foo) { ... } ... }. */ | |
d45cf215 | 4616 | |
3e4093b6 | 4617 | struct initializer_stack |
d45cf215 | 4618 | { |
3e4093b6 RS |
4619 | struct initializer_stack *next; |
4620 | tree decl; | |
3e4093b6 RS |
4621 | struct constructor_stack *constructor_stack; |
4622 | struct constructor_range_stack *constructor_range_stack; | |
4623 | tree elements; | |
4624 | struct spelling *spelling; | |
4625 | struct spelling *spelling_base; | |
4626 | int spelling_size; | |
4627 | char top_level; | |
4628 | char require_constant_value; | |
4629 | char require_constant_elements; | |
4630 | }; | |
d45cf215 | 4631 | |
802415d1 | 4632 | static struct initializer_stack *initializer_stack; |
3e4093b6 RS |
4633 | \f |
4634 | /* Prepare to parse and output the initializer for variable DECL. */ | |
400fbf9f JW |
4635 | |
4636 | void | |
a396f8ae | 4637 | start_init (tree decl, tree asmspec_tree ATTRIBUTE_UNUSED, int top_level) |
400fbf9f | 4638 | { |
3e4093b6 | 4639 | const char *locus; |
a396f8ae | 4640 | struct initializer_stack *p = xmalloc (sizeof (struct initializer_stack)); |
400fbf9f | 4641 | |
3e4093b6 | 4642 | p->decl = constructor_decl; |
3e4093b6 RS |
4643 | p->require_constant_value = require_constant_value; |
4644 | p->require_constant_elements = require_constant_elements; | |
4645 | p->constructor_stack = constructor_stack; | |
4646 | p->constructor_range_stack = constructor_range_stack; | |
4647 | p->elements = constructor_elements; | |
4648 | p->spelling = spelling; | |
4649 | p->spelling_base = spelling_base; | |
4650 | p->spelling_size = spelling_size; | |
4651 | p->top_level = constructor_top_level; | |
4652 | p->next = initializer_stack; | |
4653 | initializer_stack = p; | |
400fbf9f | 4654 | |
3e4093b6 | 4655 | constructor_decl = decl; |
3e4093b6 RS |
4656 | constructor_designated = 0; |
4657 | constructor_top_level = top_level; | |
400fbf9f | 4658 | |
6f17bbcf | 4659 | if (decl != 0 && decl != error_mark_node) |
3e4093b6 RS |
4660 | { |
4661 | require_constant_value = TREE_STATIC (decl); | |
4662 | require_constant_elements | |
4663 | = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99)) | |
4664 | /* For a scalar, you can always use any value to initialize, | |
4665 | even within braces. */ | |
4666 | && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
4667 | || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
4668 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
4669 | || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE)); | |
4670 | locus = IDENTIFIER_POINTER (DECL_NAME (decl)); | |
4671 | } | |
4672 | else | |
4673 | { | |
4674 | require_constant_value = 0; | |
4675 | require_constant_elements = 0; | |
4676 | locus = "(anonymous)"; | |
4677 | } | |
b71c7f8a | 4678 | |
3e4093b6 RS |
4679 | constructor_stack = 0; |
4680 | constructor_range_stack = 0; | |
b71c7f8a | 4681 | |
3e4093b6 RS |
4682 | missing_braces_mentioned = 0; |
4683 | ||
4684 | spelling_base = 0; | |
4685 | spelling_size = 0; | |
4686 | RESTORE_SPELLING_DEPTH (0); | |
4687 | ||
4688 | if (locus) | |
4689 | push_string (locus); | |
4690 | } | |
4691 | ||
4692 | void | |
4693 | finish_init (void) | |
b71c7f8a | 4694 | { |
3e4093b6 | 4695 | struct initializer_stack *p = initializer_stack; |
b71c7f8a | 4696 | |
3e4093b6 RS |
4697 | /* Free the whole constructor stack of this initializer. */ |
4698 | while (constructor_stack) | |
4699 | { | |
4700 | struct constructor_stack *q = constructor_stack; | |
4701 | constructor_stack = q->next; | |
4702 | free (q); | |
4703 | } | |
4704 | ||
366de0ce | 4705 | gcc_assert (!constructor_range_stack); |
3e4093b6 RS |
4706 | |
4707 | /* Pop back to the data of the outer initializer (if any). */ | |
36579663 | 4708 | free (spelling_base); |
3aeb3655 | 4709 | |
3e4093b6 | 4710 | constructor_decl = p->decl; |
3e4093b6 RS |
4711 | require_constant_value = p->require_constant_value; |
4712 | require_constant_elements = p->require_constant_elements; | |
4713 | constructor_stack = p->constructor_stack; | |
4714 | constructor_range_stack = p->constructor_range_stack; | |
4715 | constructor_elements = p->elements; | |
4716 | spelling = p->spelling; | |
4717 | spelling_base = p->spelling_base; | |
4718 | spelling_size = p->spelling_size; | |
4719 | constructor_top_level = p->top_level; | |
4720 | initializer_stack = p->next; | |
4721 | free (p); | |
b71c7f8a | 4722 | } |
400fbf9f | 4723 | \f |
3e4093b6 RS |
4724 | /* Call here when we see the initializer is surrounded by braces. |
4725 | This is instead of a call to push_init_level; | |
4726 | it is matched by a call to pop_init_level. | |
400fbf9f | 4727 | |
3e4093b6 RS |
4728 | TYPE is the type to initialize, for a constructor expression. |
4729 | For an initializer for a decl, TYPE is zero. */ | |
400fbf9f | 4730 | |
3e4093b6 RS |
4731 | void |
4732 | really_start_incremental_init (tree type) | |
400fbf9f | 4733 | { |
5d038c4c | 4734 | struct constructor_stack *p = XNEW (struct constructor_stack); |
400fbf9f | 4735 | |
3e4093b6 RS |
4736 | if (type == 0) |
4737 | type = TREE_TYPE (constructor_decl); | |
400fbf9f | 4738 | |
5fd9b178 | 4739 | if (targetm.vector_opaque_p (type)) |
3e4093b6 | 4740 | error ("opaque vector types cannot be initialized"); |
400fbf9f | 4741 | |
3e4093b6 RS |
4742 | p->type = constructor_type; |
4743 | p->fields = constructor_fields; | |
4744 | p->index = constructor_index; | |
4745 | p->max_index = constructor_max_index; | |
4746 | p->unfilled_index = constructor_unfilled_index; | |
4747 | p->unfilled_fields = constructor_unfilled_fields; | |
4748 | p->bit_index = constructor_bit_index; | |
4749 | p->elements = constructor_elements; | |
4750 | p->constant = constructor_constant; | |
4751 | p->simple = constructor_simple; | |
4752 | p->erroneous = constructor_erroneous; | |
4753 | p->pending_elts = constructor_pending_elts; | |
4754 | p->depth = constructor_depth; | |
916c5919 JM |
4755 | p->replacement_value.value = 0; |
4756 | p->replacement_value.original_code = ERROR_MARK; | |
3e4093b6 RS |
4757 | p->implicit = 0; |
4758 | p->range_stack = 0; | |
4759 | p->outer = 0; | |
4760 | p->incremental = constructor_incremental; | |
4761 | p->designated = constructor_designated; | |
4762 | p->next = 0; | |
4763 | constructor_stack = p; | |
b13aca19 | 4764 | |
3e4093b6 RS |
4765 | constructor_constant = 1; |
4766 | constructor_simple = 1; | |
4767 | constructor_depth = SPELLING_DEPTH (); | |
4768 | constructor_elements = 0; | |
4769 | constructor_pending_elts = 0; | |
4770 | constructor_type = type; | |
4771 | constructor_incremental = 1; | |
4772 | constructor_designated = 0; | |
4773 | designator_depth = 0; | |
4774 | designator_errorneous = 0; | |
400fbf9f | 4775 | |
3e4093b6 RS |
4776 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
4777 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
400fbf9f | 4778 | { |
3e4093b6 RS |
4779 | constructor_fields = TYPE_FIELDS (constructor_type); |
4780 | /* Skip any nameless bit fields at the beginning. */ | |
4781 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) | |
4782 | && DECL_NAME (constructor_fields) == 0) | |
4783 | constructor_fields = TREE_CHAIN (constructor_fields); | |
05bccae2 | 4784 | |
3e4093b6 RS |
4785 | constructor_unfilled_fields = constructor_fields; |
4786 | constructor_bit_index = bitsize_zero_node; | |
400fbf9f | 4787 | } |
3e4093b6 RS |
4788 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
4789 | { | |
4790 | if (TYPE_DOMAIN (constructor_type)) | |
4791 | { | |
4792 | constructor_max_index | |
4793 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
400fbf9f | 4794 | |
3e4093b6 RS |
4795 | /* Detect non-empty initializations of zero-length arrays. */ |
4796 | if (constructor_max_index == NULL_TREE | |
4797 | && TYPE_SIZE (constructor_type)) | |
7d60be94 | 4798 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
400fbf9f | 4799 | |
3e4093b6 RS |
4800 | /* constructor_max_index needs to be an INTEGER_CST. Attempts |
4801 | to initialize VLAs will cause a proper error; avoid tree | |
4802 | checking errors as well by setting a safe value. */ | |
4803 | if (constructor_max_index | |
4804 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
7d60be94 | 4805 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
59c83dbf | 4806 | |
3e4093b6 RS |
4807 | constructor_index |
4808 | = convert (bitsizetype, | |
4809 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
59c83dbf | 4810 | } |
3e4093b6 | 4811 | else |
493179da JM |
4812 | { |
4813 | constructor_index = bitsize_zero_node; | |
4814 | constructor_max_index = NULL_TREE; | |
4815 | } | |
59c83dbf | 4816 | |
3e4093b6 RS |
4817 | constructor_unfilled_index = constructor_index; |
4818 | } | |
4819 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
4820 | { | |
4821 | /* Vectors are like simple fixed-size arrays. */ | |
4822 | constructor_max_index = | |
7d60be94 | 4823 | build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1); |
3e4093b6 RS |
4824 | constructor_index = convert (bitsizetype, bitsize_zero_node); |
4825 | constructor_unfilled_index = constructor_index; | |
4826 | } | |
4827 | else | |
4828 | { | |
4829 | /* Handle the case of int x = {5}; */ | |
4830 | constructor_fields = constructor_type; | |
4831 | constructor_unfilled_fields = constructor_type; | |
4832 | } | |
4833 | } | |
4834 | \f | |
4835 | /* Push down into a subobject, for initialization. | |
4836 | If this is for an explicit set of braces, IMPLICIT is 0. | |
4837 | If it is because the next element belongs at a lower level, | |
4838 | IMPLICIT is 1 (or 2 if the push is because of designator list). */ | |
400fbf9f | 4839 | |
3e4093b6 RS |
4840 | void |
4841 | push_init_level (int implicit) | |
4842 | { | |
4843 | struct constructor_stack *p; | |
4844 | tree value = NULL_TREE; | |
400fbf9f | 4845 | |
3e4093b6 | 4846 | /* If we've exhausted any levels that didn't have braces, |
472d98b4 JM |
4847 | pop them now. If implicit == 1, this will have been done in |
4848 | process_init_element; do not repeat it here because in the case | |
4849 | of excess initializers for an empty aggregate this leads to an | |
4850 | infinite cycle of popping a level and immediately recreating | |
4851 | it. */ | |
4852 | if (implicit != 1) | |
3e4093b6 | 4853 | { |
472d98b4 JM |
4854 | while (constructor_stack->implicit) |
4855 | { | |
4856 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
4857 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
4858 | && constructor_fields == 0) | |
4859 | process_init_element (pop_init_level (1)); | |
4860 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
4861 | && constructor_max_index | |
4862 | && tree_int_cst_lt (constructor_max_index, | |
4863 | constructor_index)) | |
4864 | process_init_element (pop_init_level (1)); | |
4865 | else | |
4866 | break; | |
4867 | } | |
3e4093b6 | 4868 | } |
400fbf9f | 4869 | |
3e4093b6 RS |
4870 | /* Unless this is an explicit brace, we need to preserve previous |
4871 | content if any. */ | |
4872 | if (implicit) | |
4873 | { | |
4874 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
4875 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
4876 | && constructor_fields) | |
4877 | value = find_init_member (constructor_fields); | |
4878 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
4879 | value = find_init_member (constructor_index); | |
400fbf9f JW |
4880 | } |
4881 | ||
5d038c4c | 4882 | p = XNEW (struct constructor_stack); |
3e4093b6 RS |
4883 | p->type = constructor_type; |
4884 | p->fields = constructor_fields; | |
4885 | p->index = constructor_index; | |
4886 | p->max_index = constructor_max_index; | |
4887 | p->unfilled_index = constructor_unfilled_index; | |
4888 | p->unfilled_fields = constructor_unfilled_fields; | |
4889 | p->bit_index = constructor_bit_index; | |
4890 | p->elements = constructor_elements; | |
4891 | p->constant = constructor_constant; | |
4892 | p->simple = constructor_simple; | |
4893 | p->erroneous = constructor_erroneous; | |
4894 | p->pending_elts = constructor_pending_elts; | |
4895 | p->depth = constructor_depth; | |
916c5919 JM |
4896 | p->replacement_value.value = 0; |
4897 | p->replacement_value.original_code = ERROR_MARK; | |
3e4093b6 RS |
4898 | p->implicit = implicit; |
4899 | p->outer = 0; | |
4900 | p->incremental = constructor_incremental; | |
4901 | p->designated = constructor_designated; | |
4902 | p->next = constructor_stack; | |
4903 | p->range_stack = 0; | |
4904 | constructor_stack = p; | |
400fbf9f | 4905 | |
3e4093b6 RS |
4906 | constructor_constant = 1; |
4907 | constructor_simple = 1; | |
4908 | constructor_depth = SPELLING_DEPTH (); | |
4909 | constructor_elements = 0; | |
4910 | constructor_incremental = 1; | |
4911 | constructor_designated = 0; | |
4912 | constructor_pending_elts = 0; | |
4913 | if (!implicit) | |
400fbf9f | 4914 | { |
3e4093b6 RS |
4915 | p->range_stack = constructor_range_stack; |
4916 | constructor_range_stack = 0; | |
4917 | designator_depth = 0; | |
4918 | designator_errorneous = 0; | |
4919 | } | |
400fbf9f | 4920 | |
3e4093b6 RS |
4921 | /* Don't die if an entire brace-pair level is superfluous |
4922 | in the containing level. */ | |
4923 | if (constructor_type == 0) | |
4924 | ; | |
4925 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
4926 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
4927 | { | |
4928 | /* Don't die if there are extra init elts at the end. */ | |
4929 | if (constructor_fields == 0) | |
4930 | constructor_type = 0; | |
4931 | else | |
400fbf9f | 4932 | { |
3e4093b6 RS |
4933 | constructor_type = TREE_TYPE (constructor_fields); |
4934 | push_member_name (constructor_fields); | |
4935 | constructor_depth++; | |
400fbf9f | 4936 | } |
3e4093b6 RS |
4937 | } |
4938 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
4939 | { | |
4940 | constructor_type = TREE_TYPE (constructor_type); | |
4941 | push_array_bounds (tree_low_cst (constructor_index, 0)); | |
4942 | constructor_depth++; | |
400fbf9f JW |
4943 | } |
4944 | ||
3e4093b6 | 4945 | if (constructor_type == 0) |
400fbf9f | 4946 | { |
3e4093b6 RS |
4947 | error_init ("extra brace group at end of initializer"); |
4948 | constructor_fields = 0; | |
4949 | constructor_unfilled_fields = 0; | |
4950 | return; | |
400fbf9f JW |
4951 | } |
4952 | ||
3e4093b6 RS |
4953 | if (value && TREE_CODE (value) == CONSTRUCTOR) |
4954 | { | |
4955 | constructor_constant = TREE_CONSTANT (value); | |
4956 | constructor_simple = TREE_STATIC (value); | |
4957 | constructor_elements = CONSTRUCTOR_ELTS (value); | |
4958 | if (constructor_elements | |
4959 | && (TREE_CODE (constructor_type) == RECORD_TYPE | |
4960 | || TREE_CODE (constructor_type) == ARRAY_TYPE)) | |
4961 | set_nonincremental_init (); | |
4962 | } | |
400fbf9f | 4963 | |
3e4093b6 RS |
4964 | if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned) |
4965 | { | |
4966 | missing_braces_mentioned = 1; | |
4967 | warning_init ("missing braces around initializer"); | |
4968 | } | |
400fbf9f | 4969 | |
3e4093b6 RS |
4970 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
4971 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
4972 | { | |
4973 | constructor_fields = TYPE_FIELDS (constructor_type); | |
4974 | /* Skip any nameless bit fields at the beginning. */ | |
4975 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) | |
4976 | && DECL_NAME (constructor_fields) == 0) | |
4977 | constructor_fields = TREE_CHAIN (constructor_fields); | |
103b7b17 | 4978 | |
3e4093b6 RS |
4979 | constructor_unfilled_fields = constructor_fields; |
4980 | constructor_bit_index = bitsize_zero_node; | |
4981 | } | |
4982 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
4983 | { | |
4984 | /* Vectors are like simple fixed-size arrays. */ | |
4985 | constructor_max_index = | |
7d60be94 | 4986 | build_int_cst (NULL_TREE, TYPE_VECTOR_SUBPARTS (constructor_type) - 1); |
3e4093b6 RS |
4987 | constructor_index = convert (bitsizetype, integer_zero_node); |
4988 | constructor_unfilled_index = constructor_index; | |
4989 | } | |
4990 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
4991 | { | |
4992 | if (TYPE_DOMAIN (constructor_type)) | |
4993 | { | |
4994 | constructor_max_index | |
4995 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
400fbf9f | 4996 | |
3e4093b6 RS |
4997 | /* Detect non-empty initializations of zero-length arrays. */ |
4998 | if (constructor_max_index == NULL_TREE | |
4999 | && TYPE_SIZE (constructor_type)) | |
7d60be94 | 5000 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
de520661 | 5001 | |
3e4093b6 RS |
5002 | /* constructor_max_index needs to be an INTEGER_CST. Attempts |
5003 | to initialize VLAs will cause a proper error; avoid tree | |
5004 | checking errors as well by setting a safe value. */ | |
5005 | if (constructor_max_index | |
5006 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
7d60be94 | 5007 | constructor_max_index = build_int_cst (NULL_TREE, -1); |
b62acd60 | 5008 | |
3e4093b6 RS |
5009 | constructor_index |
5010 | = convert (bitsizetype, | |
5011 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5012 | } | |
5013 | else | |
5014 | constructor_index = bitsize_zero_node; | |
de520661 | 5015 | |
3e4093b6 RS |
5016 | constructor_unfilled_index = constructor_index; |
5017 | if (value && TREE_CODE (value) == STRING_CST) | |
5018 | { | |
5019 | /* We need to split the char/wchar array into individual | |
5020 | characters, so that we don't have to special case it | |
5021 | everywhere. */ | |
5022 | set_nonincremental_init_from_string (value); | |
5023 | } | |
5024 | } | |
5025 | else | |
5026 | { | |
b4519d39 SB |
5027 | if (constructor_type != error_mark_node) |
5028 | warning_init ("braces around scalar initializer"); | |
3e4093b6 RS |
5029 | constructor_fields = constructor_type; |
5030 | constructor_unfilled_fields = constructor_type; | |
5031 | } | |
5032 | } | |
8b6a5902 | 5033 | |
3e4093b6 | 5034 | /* At the end of an implicit or explicit brace level, |
916c5919 JM |
5035 | finish up that level of constructor. If a single expression |
5036 | with redundant braces initialized that level, return the | |
5037 | c_expr structure for that expression. Otherwise, the original_code | |
5038 | element is set to ERROR_MARK. | |
5039 | If we were outputting the elements as they are read, return 0 as the value | |
3e4093b6 | 5040 | from inner levels (process_init_element ignores that), |
916c5919 | 5041 | but return error_mark_node as the value from the outermost level |
3e4093b6 | 5042 | (that's what we want to put in DECL_INITIAL). |
916c5919 | 5043 | Otherwise, return a CONSTRUCTOR expression as the value. */ |
de520661 | 5044 | |
916c5919 | 5045 | struct c_expr |
3e4093b6 RS |
5046 | pop_init_level (int implicit) |
5047 | { | |
5048 | struct constructor_stack *p; | |
916c5919 JM |
5049 | struct c_expr ret; |
5050 | ret.value = 0; | |
5051 | ret.original_code = ERROR_MARK; | |
de520661 | 5052 | |
3e4093b6 RS |
5053 | if (implicit == 0) |
5054 | { | |
5055 | /* When we come to an explicit close brace, | |
5056 | pop any inner levels that didn't have explicit braces. */ | |
5057 | while (constructor_stack->implicit) | |
5058 | process_init_element (pop_init_level (1)); | |
de520661 | 5059 | |
366de0ce | 5060 | gcc_assert (!constructor_range_stack); |
3e4093b6 | 5061 | } |
e5e809f4 | 5062 | |
0066ef9c RH |
5063 | /* Now output all pending elements. */ |
5064 | constructor_incremental = 1; | |
5065 | output_pending_init_elements (1); | |
5066 | ||
3e4093b6 | 5067 | p = constructor_stack; |
e5e809f4 | 5068 | |
3e4093b6 RS |
5069 | /* Error for initializing a flexible array member, or a zero-length |
5070 | array member in an inappropriate context. */ | |
5071 | if (constructor_type && constructor_fields | |
5072 | && TREE_CODE (constructor_type) == ARRAY_TYPE | |
5073 | && TYPE_DOMAIN (constructor_type) | |
3f75a254 | 5074 | && !TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type))) |
3e4093b6 RS |
5075 | { |
5076 | /* Silently discard empty initializations. The parser will | |
5077 | already have pedwarned for empty brackets. */ | |
5078 | if (integer_zerop (constructor_unfilled_index)) | |
5079 | constructor_type = NULL_TREE; | |
366de0ce | 5080 | else |
3e4093b6 | 5081 | { |
366de0ce NS |
5082 | gcc_assert (!TYPE_SIZE (constructor_type)); |
5083 | ||
3e4093b6 RS |
5084 | if (constructor_depth > 2) |
5085 | error_init ("initialization of flexible array member in a nested context"); | |
5086 | else if (pedantic) | |
5087 | pedwarn_init ("initialization of a flexible array member"); | |
de520661 | 5088 | |
3e4093b6 RS |
5089 | /* We have already issued an error message for the existence |
5090 | of a flexible array member not at the end of the structure. | |
535a42b1 | 5091 | Discard the initializer so that we do not die later. */ |
3e4093b6 RS |
5092 | if (TREE_CHAIN (constructor_fields) != NULL_TREE) |
5093 | constructor_type = NULL_TREE; | |
5094 | } | |
3e4093b6 | 5095 | } |
de520661 | 5096 | |
3e4093b6 | 5097 | /* Warn when some struct elements are implicitly initialized to zero. */ |
eaac4679 | 5098 | if (warn_missing_field_initializers |
3e4093b6 RS |
5099 | && constructor_type |
5100 | && TREE_CODE (constructor_type) == RECORD_TYPE | |
5101 | && constructor_unfilled_fields) | |
5102 | { | |
5103 | /* Do not warn for flexible array members or zero-length arrays. */ | |
5104 | while (constructor_unfilled_fields | |
3f75a254 | 5105 | && (!DECL_SIZE (constructor_unfilled_fields) |
3e4093b6 RS |
5106 | || integer_zerop (DECL_SIZE (constructor_unfilled_fields)))) |
5107 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
cc77d4d5 | 5108 | |
3e4093b6 RS |
5109 | /* Do not warn if this level of the initializer uses member |
5110 | designators; it is likely to be deliberate. */ | |
5111 | if (constructor_unfilled_fields && !constructor_designated) | |
5112 | { | |
5113 | push_member_name (constructor_unfilled_fields); | |
5114 | warning_init ("missing initializer"); | |
5115 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
5116 | } | |
5117 | } | |
de520661 | 5118 | |
3e4093b6 | 5119 | /* Pad out the end of the structure. */ |
916c5919 | 5120 | if (p->replacement_value.value) |
3e4093b6 RS |
5121 | /* If this closes a superfluous brace pair, |
5122 | just pass out the element between them. */ | |
916c5919 | 5123 | ret = p->replacement_value; |
3e4093b6 RS |
5124 | else if (constructor_type == 0) |
5125 | ; | |
5126 | else if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5127 | && TREE_CODE (constructor_type) != UNION_TYPE | |
5128 | && TREE_CODE (constructor_type) != ARRAY_TYPE | |
5129 | && TREE_CODE (constructor_type) != VECTOR_TYPE) | |
5130 | { | |
5131 | /* A nonincremental scalar initializer--just return | |
5132 | the element, after verifying there is just one. */ | |
5133 | if (constructor_elements == 0) | |
5134 | { | |
5135 | if (!constructor_erroneous) | |
5136 | error_init ("empty scalar initializer"); | |
916c5919 | 5137 | ret.value = error_mark_node; |
3e4093b6 RS |
5138 | } |
5139 | else if (TREE_CHAIN (constructor_elements) != 0) | |
5140 | { | |
5141 | error_init ("extra elements in scalar initializer"); | |
916c5919 | 5142 | ret.value = TREE_VALUE (constructor_elements); |
3e4093b6 RS |
5143 | } |
5144 | else | |
916c5919 | 5145 | ret.value = TREE_VALUE (constructor_elements); |
3e4093b6 RS |
5146 | } |
5147 | else | |
5148 | { | |
5149 | if (constructor_erroneous) | |
916c5919 | 5150 | ret.value = error_mark_node; |
3e4093b6 RS |
5151 | else |
5152 | { | |
916c5919 JM |
5153 | ret.value = build_constructor (constructor_type, |
5154 | nreverse (constructor_elements)); | |
3e4093b6 | 5155 | if (constructor_constant) |
916c5919 | 5156 | TREE_CONSTANT (ret.value) = TREE_INVARIANT (ret.value) = 1; |
3e4093b6 | 5157 | if (constructor_constant && constructor_simple) |
916c5919 | 5158 | TREE_STATIC (ret.value) = 1; |
3e4093b6 RS |
5159 | } |
5160 | } | |
de520661 | 5161 | |
3e4093b6 RS |
5162 | constructor_type = p->type; |
5163 | constructor_fields = p->fields; | |
5164 | constructor_index = p->index; | |
5165 | constructor_max_index = p->max_index; | |
5166 | constructor_unfilled_index = p->unfilled_index; | |
5167 | constructor_unfilled_fields = p->unfilled_fields; | |
5168 | constructor_bit_index = p->bit_index; | |
5169 | constructor_elements = p->elements; | |
5170 | constructor_constant = p->constant; | |
5171 | constructor_simple = p->simple; | |
5172 | constructor_erroneous = p->erroneous; | |
5173 | constructor_incremental = p->incremental; | |
5174 | constructor_designated = p->designated; | |
5175 | constructor_pending_elts = p->pending_elts; | |
5176 | constructor_depth = p->depth; | |
5177 | if (!p->implicit) | |
5178 | constructor_range_stack = p->range_stack; | |
5179 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
de520661 | 5180 | |
3e4093b6 RS |
5181 | constructor_stack = p->next; |
5182 | free (p); | |
b621a4dd | 5183 | |
916c5919 | 5184 | if (ret.value == 0) |
3e4093b6 RS |
5185 | { |
5186 | if (constructor_stack == 0) | |
916c5919 JM |
5187 | { |
5188 | ret.value = error_mark_node; | |
5189 | return ret; | |
5190 | } | |
5191 | return ret; | |
3e4093b6 | 5192 | } |
916c5919 | 5193 | return ret; |
3e4093b6 | 5194 | } |
8b6a5902 | 5195 | |
3e4093b6 RS |
5196 | /* Common handling for both array range and field name designators. |
5197 | ARRAY argument is nonzero for array ranges. Returns zero for success. */ | |
400fbf9f | 5198 | |
3e4093b6 RS |
5199 | static int |
5200 | set_designator (int array) | |
de520661 | 5201 | { |
3e4093b6 RS |
5202 | tree subtype; |
5203 | enum tree_code subcode; | |
de520661 | 5204 | |
3e4093b6 RS |
5205 | /* Don't die if an entire brace-pair level is superfluous |
5206 | in the containing level. */ | |
5207 | if (constructor_type == 0) | |
5208 | return 1; | |
de520661 | 5209 | |
366de0ce NS |
5210 | /* If there were errors in this designator list already, bail out |
5211 | silently. */ | |
3e4093b6 RS |
5212 | if (designator_errorneous) |
5213 | return 1; | |
e28cae4f | 5214 | |
3e4093b6 RS |
5215 | if (!designator_depth) |
5216 | { | |
366de0ce | 5217 | gcc_assert (!constructor_range_stack); |
de520661 | 5218 | |
3e4093b6 RS |
5219 | /* Designator list starts at the level of closest explicit |
5220 | braces. */ | |
5221 | while (constructor_stack->implicit) | |
5222 | process_init_element (pop_init_level (1)); | |
5223 | constructor_designated = 1; | |
5224 | return 0; | |
5225 | } | |
de520661 | 5226 | |
366de0ce | 5227 | switch (TREE_CODE (constructor_type)) |
3c3fa147 | 5228 | { |
366de0ce NS |
5229 | case RECORD_TYPE: |
5230 | case UNION_TYPE: | |
3e4093b6 RS |
5231 | subtype = TREE_TYPE (constructor_fields); |
5232 | if (subtype != error_mark_node) | |
5233 | subtype = TYPE_MAIN_VARIANT (subtype); | |
366de0ce NS |
5234 | break; |
5235 | case ARRAY_TYPE: | |
3e4093b6 | 5236 | subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); |
366de0ce NS |
5237 | break; |
5238 | default: | |
5239 | gcc_unreachable (); | |
de520661 | 5240 | } |
400fbf9f | 5241 | |
3e4093b6 RS |
5242 | subcode = TREE_CODE (subtype); |
5243 | if (array && subcode != ARRAY_TYPE) | |
5244 | { | |
5245 | error_init ("array index in non-array initializer"); | |
5246 | return 1; | |
5247 | } | |
5248 | else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE) | |
5249 | { | |
5250 | error_init ("field name not in record or union initializer"); | |
5251 | return 1; | |
5252 | } | |
d45cf215 | 5253 | |
3e4093b6 RS |
5254 | constructor_designated = 1; |
5255 | push_init_level (2); | |
5256 | return 0; | |
de520661 | 5257 | } |
400fbf9f | 5258 | |
3e4093b6 RS |
5259 | /* If there are range designators in designator list, push a new designator |
5260 | to constructor_range_stack. RANGE_END is end of such stack range or | |
5261 | NULL_TREE if there is no range designator at this level. */ | |
400fbf9f | 5262 | |
3e4093b6 RS |
5263 | static void |
5264 | push_range_stack (tree range_end) | |
5265 | { | |
5266 | struct constructor_range_stack *p; | |
400fbf9f | 5267 | |
5d038c4c | 5268 | p = GGC_NEW (struct constructor_range_stack); |
3e4093b6 RS |
5269 | p->prev = constructor_range_stack; |
5270 | p->next = 0; | |
5271 | p->fields = constructor_fields; | |
5272 | p->range_start = constructor_index; | |
5273 | p->index = constructor_index; | |
5274 | p->stack = constructor_stack; | |
5275 | p->range_end = range_end; | |
8b6a5902 | 5276 | if (constructor_range_stack) |
3e4093b6 RS |
5277 | constructor_range_stack->next = p; |
5278 | constructor_range_stack = p; | |
de520661 | 5279 | } |
400fbf9f | 5280 | |
3e4093b6 RS |
5281 | /* Within an array initializer, specify the next index to be initialized. |
5282 | FIRST is that index. If LAST is nonzero, then initialize a range | |
5283 | of indices, running from FIRST through LAST. */ | |
5a7ec9d9 | 5284 | |
de520661 | 5285 | void |
3e4093b6 | 5286 | set_init_index (tree first, tree last) |
de520661 | 5287 | { |
3e4093b6 RS |
5288 | if (set_designator (1)) |
5289 | return; | |
de520661 | 5290 | |
3e4093b6 | 5291 | designator_errorneous = 1; |
de520661 | 5292 | |
3ea8cd06 JM |
5293 | if (!INTEGRAL_TYPE_P (TREE_TYPE (first)) |
5294 | || (last && !INTEGRAL_TYPE_P (TREE_TYPE (last)))) | |
5295 | { | |
5296 | error_init ("array index in initializer not of integer type"); | |
5297 | return; | |
5298 | } | |
5299 | ||
3e4093b6 RS |
5300 | if (TREE_CODE (first) != INTEGER_CST) |
5301 | error_init ("nonconstant array index in initializer"); | |
5302 | else if (last != 0 && TREE_CODE (last) != INTEGER_CST) | |
5303 | error_init ("nonconstant array index in initializer"); | |
5304 | else if (TREE_CODE (constructor_type) != ARRAY_TYPE) | |
5305 | error_init ("array index in non-array initializer"); | |
622adc7e MK |
5306 | else if (tree_int_cst_sgn (first) == -1) |
5307 | error_init ("array index in initializer exceeds array bounds"); | |
3e4093b6 RS |
5308 | else if (constructor_max_index |
5309 | && tree_int_cst_lt (constructor_max_index, first)) | |
5310 | error_init ("array index in initializer exceeds array bounds"); | |
5311 | else | |
de520661 | 5312 | { |
3e4093b6 | 5313 | constructor_index = convert (bitsizetype, first); |
665f2503 | 5314 | |
3e4093b6 | 5315 | if (last) |
2bede729 | 5316 | { |
3e4093b6 RS |
5317 | if (tree_int_cst_equal (first, last)) |
5318 | last = 0; | |
5319 | else if (tree_int_cst_lt (last, first)) | |
5320 | { | |
5321 | error_init ("empty index range in initializer"); | |
5322 | last = 0; | |
5323 | } | |
5324 | else | |
5325 | { | |
5326 | last = convert (bitsizetype, last); | |
5327 | if (constructor_max_index != 0 | |
5328 | && tree_int_cst_lt (constructor_max_index, last)) | |
5329 | { | |
5330 | error_init ("array index range in initializer exceeds array bounds"); | |
5331 | last = 0; | |
5332 | } | |
5333 | } | |
2bede729 | 5334 | } |
fed3cef0 | 5335 | |
3e4093b6 RS |
5336 | designator_depth++; |
5337 | designator_errorneous = 0; | |
5338 | if (constructor_range_stack || last) | |
5339 | push_range_stack (last); | |
de520661 | 5340 | } |
de520661 | 5341 | } |
3e4093b6 RS |
5342 | |
5343 | /* Within a struct initializer, specify the next field to be initialized. */ | |
400fbf9f | 5344 | |
de520661 | 5345 | void |
3e4093b6 | 5346 | set_init_label (tree fieldname) |
de520661 | 5347 | { |
3e4093b6 | 5348 | tree tail; |
94ba5069 | 5349 | |
3e4093b6 RS |
5350 | if (set_designator (0)) |
5351 | return; | |
5352 | ||
5353 | designator_errorneous = 1; | |
5354 | ||
5355 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5356 | && TREE_CODE (constructor_type) != UNION_TYPE) | |
94ba5069 | 5357 | { |
3e4093b6 RS |
5358 | error_init ("field name not in record or union initializer"); |
5359 | return; | |
94ba5069 RS |
5360 | } |
5361 | ||
3e4093b6 RS |
5362 | for (tail = TYPE_FIELDS (constructor_type); tail; |
5363 | tail = TREE_CHAIN (tail)) | |
8b6a5902 | 5364 | { |
3e4093b6 RS |
5365 | if (DECL_NAME (tail) == fieldname) |
5366 | break; | |
8b6a5902 JJ |
5367 | } |
5368 | ||
3e4093b6 | 5369 | if (tail == 0) |
c51a1ba9 | 5370 | error ("unknown field %qE specified in initializer", fieldname); |
3e4093b6 | 5371 | else |
8b6a5902 | 5372 | { |
3e4093b6 RS |
5373 | constructor_fields = tail; |
5374 | designator_depth++; | |
8b6a5902 | 5375 | designator_errorneous = 0; |
3e4093b6 RS |
5376 | if (constructor_range_stack) |
5377 | push_range_stack (NULL_TREE); | |
8b6a5902 | 5378 | } |
3e4093b6 RS |
5379 | } |
5380 | \f | |
5381 | /* Add a new initializer to the tree of pending initializers. PURPOSE | |
5382 | identifies the initializer, either array index or field in a structure. | |
5383 | VALUE is the value of that index or field. */ | |
de520661 | 5384 | |
3e4093b6 RS |
5385 | static void |
5386 | add_pending_init (tree purpose, tree value) | |
5387 | { | |
5388 | struct init_node *p, **q, *r; | |
5389 | ||
5390 | q = &constructor_pending_elts; | |
5391 | p = 0; | |
5392 | ||
5393 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
de520661 | 5394 | { |
3e4093b6 | 5395 | while (*q != 0) |
91fa3c30 | 5396 | { |
3e4093b6 RS |
5397 | p = *q; |
5398 | if (tree_int_cst_lt (purpose, p->purpose)) | |
5399 | q = &p->left; | |
5400 | else if (tree_int_cst_lt (p->purpose, purpose)) | |
5401 | q = &p->right; | |
5402 | else | |
5403 | { | |
5404 | if (TREE_SIDE_EFFECTS (p->value)) | |
5405 | warning_init ("initialized field with side-effects overwritten"); | |
5406 | p->value = value; | |
5407 | return; | |
5408 | } | |
91fa3c30 | 5409 | } |
de520661 | 5410 | } |
3e4093b6 | 5411 | else |
de520661 | 5412 | { |
3e4093b6 | 5413 | tree bitpos; |
400fbf9f | 5414 | |
3e4093b6 RS |
5415 | bitpos = bit_position (purpose); |
5416 | while (*q != NULL) | |
5417 | { | |
5418 | p = *q; | |
5419 | if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) | |
5420 | q = &p->left; | |
5421 | else if (p->purpose != purpose) | |
5422 | q = &p->right; | |
5423 | else | |
5424 | { | |
5425 | if (TREE_SIDE_EFFECTS (p->value)) | |
5426 | warning_init ("initialized field with side-effects overwritten"); | |
5427 | p->value = value; | |
5428 | return; | |
5429 | } | |
5430 | } | |
91fa3c30 | 5431 | } |
b71c7f8a | 5432 | |
5d038c4c | 5433 | r = GGC_NEW (struct init_node); |
3e4093b6 RS |
5434 | r->purpose = purpose; |
5435 | r->value = value; | |
8b6a5902 | 5436 | |
3e4093b6 RS |
5437 | *q = r; |
5438 | r->parent = p; | |
5439 | r->left = 0; | |
5440 | r->right = 0; | |
5441 | r->balance = 0; | |
b71c7f8a | 5442 | |
3e4093b6 | 5443 | while (p) |
de520661 | 5444 | { |
3e4093b6 | 5445 | struct init_node *s; |
665f2503 | 5446 | |
3e4093b6 | 5447 | if (r == p->left) |
2bede729 | 5448 | { |
3e4093b6 RS |
5449 | if (p->balance == 0) |
5450 | p->balance = -1; | |
5451 | else if (p->balance < 0) | |
5452 | { | |
5453 | if (r->balance < 0) | |
5454 | { | |
5455 | /* L rotation. */ | |
5456 | p->left = r->right; | |
5457 | if (p->left) | |
5458 | p->left->parent = p; | |
5459 | r->right = p; | |
e7b6a0ee | 5460 | |
3e4093b6 RS |
5461 | p->balance = 0; |
5462 | r->balance = 0; | |
39bc99c2 | 5463 | |
3e4093b6 RS |
5464 | s = p->parent; |
5465 | p->parent = r; | |
5466 | r->parent = s; | |
5467 | if (s) | |
5468 | { | |
5469 | if (s->left == p) | |
5470 | s->left = r; | |
5471 | else | |
5472 | s->right = r; | |
5473 | } | |
5474 | else | |
5475 | constructor_pending_elts = r; | |
5476 | } | |
5477 | else | |
5478 | { | |
5479 | /* LR rotation. */ | |
5480 | struct init_node *t = r->right; | |
e7b6a0ee | 5481 | |
3e4093b6 RS |
5482 | r->right = t->left; |
5483 | if (r->right) | |
5484 | r->right->parent = r; | |
5485 | t->left = r; | |
5486 | ||
5487 | p->left = t->right; | |
5488 | if (p->left) | |
5489 | p->left->parent = p; | |
5490 | t->right = p; | |
5491 | ||
5492 | p->balance = t->balance < 0; | |
5493 | r->balance = -(t->balance > 0); | |
5494 | t->balance = 0; | |
5495 | ||
5496 | s = p->parent; | |
5497 | p->parent = t; | |
5498 | r->parent = t; | |
5499 | t->parent = s; | |
5500 | if (s) | |
5501 | { | |
5502 | if (s->left == p) | |
5503 | s->left = t; | |
5504 | else | |
5505 | s->right = t; | |
5506 | } | |
5507 | else | |
5508 | constructor_pending_elts = t; | |
5509 | } | |
5510 | break; | |
5511 | } | |
5512 | else | |
5513 | { | |
5514 | /* p->balance == +1; growth of left side balances the node. */ | |
5515 | p->balance = 0; | |
5516 | break; | |
5517 | } | |
2bede729 | 5518 | } |
3e4093b6 RS |
5519 | else /* r == p->right */ |
5520 | { | |
5521 | if (p->balance == 0) | |
5522 | /* Growth propagation from right side. */ | |
5523 | p->balance++; | |
5524 | else if (p->balance > 0) | |
5525 | { | |
5526 | if (r->balance > 0) | |
5527 | { | |
5528 | /* R rotation. */ | |
5529 | p->right = r->left; | |
5530 | if (p->right) | |
5531 | p->right->parent = p; | |
5532 | r->left = p; | |
5533 | ||
5534 | p->balance = 0; | |
5535 | r->balance = 0; | |
5536 | ||
5537 | s = p->parent; | |
5538 | p->parent = r; | |
5539 | r->parent = s; | |
5540 | if (s) | |
5541 | { | |
5542 | if (s->left == p) | |
5543 | s->left = r; | |
5544 | else | |
5545 | s->right = r; | |
5546 | } | |
5547 | else | |
5548 | constructor_pending_elts = r; | |
5549 | } | |
5550 | else /* r->balance == -1 */ | |
5551 | { | |
5552 | /* RL rotation */ | |
5553 | struct init_node *t = r->left; | |
5554 | ||
5555 | r->left = t->right; | |
5556 | if (r->left) | |
5557 | r->left->parent = r; | |
5558 | t->right = r; | |
5559 | ||
5560 | p->right = t->left; | |
5561 | if (p->right) | |
5562 | p->right->parent = p; | |
5563 | t->left = p; | |
5564 | ||
5565 | r->balance = (t->balance < 0); | |
5566 | p->balance = -(t->balance > 0); | |
5567 | t->balance = 0; | |
5568 | ||
5569 | s = p->parent; | |
5570 | p->parent = t; | |
5571 | r->parent = t; | |
5572 | t->parent = s; | |
5573 | if (s) | |
5574 | { | |
5575 | if (s->left == p) | |
5576 | s->left = t; | |
5577 | else | |
5578 | s->right = t; | |
5579 | } | |
5580 | else | |
5581 | constructor_pending_elts = t; | |
5582 | } | |
5583 | break; | |
5584 | } | |
5585 | else | |
5586 | { | |
5587 | /* p->balance == -1; growth of right side balances the node. */ | |
5588 | p->balance = 0; | |
5589 | break; | |
5590 | } | |
5591 | } | |
5592 | ||
5593 | r = p; | |
5594 | p = p->parent; | |
5595 | } | |
5596 | } | |
5597 | ||
5598 | /* Build AVL tree from a sorted chain. */ | |
5599 | ||
5600 | static void | |
5601 | set_nonincremental_init (void) | |
5602 | { | |
5603 | tree chain; | |
5604 | ||
5605 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5606 | && TREE_CODE (constructor_type) != ARRAY_TYPE) | |
5607 | return; | |
5608 | ||
5609 | for (chain = constructor_elements; chain; chain = TREE_CHAIN (chain)) | |
5610 | add_pending_init (TREE_PURPOSE (chain), TREE_VALUE (chain)); | |
5611 | constructor_elements = 0; | |
5612 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5613 | { | |
5614 | constructor_unfilled_fields = TYPE_FIELDS (constructor_type); | |
5615 | /* Skip any nameless bit fields at the beginning. */ | |
5616 | while (constructor_unfilled_fields != 0 | |
5617 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
5618 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
5619 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
fed3cef0 | 5620 | |
de520661 | 5621 | } |
3e4093b6 | 5622 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
de520661 | 5623 | { |
3e4093b6 RS |
5624 | if (TYPE_DOMAIN (constructor_type)) |
5625 | constructor_unfilled_index | |
5626 | = convert (bitsizetype, | |
5627 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5628 | else | |
5629 | constructor_unfilled_index = bitsize_zero_node; | |
de520661 | 5630 | } |
3e4093b6 | 5631 | constructor_incremental = 0; |
de520661 | 5632 | } |
400fbf9f | 5633 | |
3e4093b6 | 5634 | /* Build AVL tree from a string constant. */ |
de520661 | 5635 | |
3e4093b6 RS |
5636 | static void |
5637 | set_nonincremental_init_from_string (tree str) | |
de520661 | 5638 | { |
3e4093b6 RS |
5639 | tree value, purpose, type; |
5640 | HOST_WIDE_INT val[2]; | |
5641 | const char *p, *end; | |
5642 | int byte, wchar_bytes, charwidth, bitpos; | |
de520661 | 5643 | |
366de0ce | 5644 | gcc_assert (TREE_CODE (constructor_type) == ARRAY_TYPE); |
940ff66d | 5645 | |
3e4093b6 RS |
5646 | if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) |
5647 | == TYPE_PRECISION (char_type_node)) | |
5648 | wchar_bytes = 1; | |
3e4093b6 | 5649 | else |
366de0ce NS |
5650 | { |
5651 | gcc_assert (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) | |
5652 | == TYPE_PRECISION (wchar_type_node)); | |
5653 | wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; | |
5654 | } | |
3e4093b6 RS |
5655 | charwidth = TYPE_PRECISION (char_type_node); |
5656 | type = TREE_TYPE (constructor_type); | |
5657 | p = TREE_STRING_POINTER (str); | |
5658 | end = p + TREE_STRING_LENGTH (str); | |
91fa3c30 | 5659 | |
3e4093b6 RS |
5660 | for (purpose = bitsize_zero_node; |
5661 | p < end && !tree_int_cst_lt (constructor_max_index, purpose); | |
5662 | purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node)) | |
584ef5fe | 5663 | { |
3e4093b6 | 5664 | if (wchar_bytes == 1) |
ffc5c6a9 | 5665 | { |
3e4093b6 RS |
5666 | val[1] = (unsigned char) *p++; |
5667 | val[0] = 0; | |
ffc5c6a9 RH |
5668 | } |
5669 | else | |
3e4093b6 RS |
5670 | { |
5671 | val[0] = 0; | |
5672 | val[1] = 0; | |
5673 | for (byte = 0; byte < wchar_bytes; byte++) | |
5674 | { | |
5675 | if (BYTES_BIG_ENDIAN) | |
5676 | bitpos = (wchar_bytes - byte - 1) * charwidth; | |
5677 | else | |
5678 | bitpos = byte * charwidth; | |
5679 | val[bitpos < HOST_BITS_PER_WIDE_INT] | |
5680 | |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++)) | |
5681 | << (bitpos % HOST_BITS_PER_WIDE_INT); | |
5682 | } | |
5683 | } | |
584ef5fe | 5684 | |
8df83eae | 5685 | if (!TYPE_UNSIGNED (type)) |
3e4093b6 RS |
5686 | { |
5687 | bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR; | |
5688 | if (bitpos < HOST_BITS_PER_WIDE_INT) | |
5689 | { | |
5690 | if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1))) | |
5691 | { | |
5692 | val[1] |= ((HOST_WIDE_INT) -1) << bitpos; | |
5693 | val[0] = -1; | |
5694 | } | |
5695 | } | |
5696 | else if (bitpos == HOST_BITS_PER_WIDE_INT) | |
5697 | { | |
5698 | if (val[1] < 0) | |
5699 | val[0] = -1; | |
5700 | } | |
5701 | else if (val[0] & (((HOST_WIDE_INT) 1) | |
5702 | << (bitpos - 1 - HOST_BITS_PER_WIDE_INT))) | |
5703 | val[0] |= ((HOST_WIDE_INT) -1) | |
5704 | << (bitpos - HOST_BITS_PER_WIDE_INT); | |
5705 | } | |
ffc5c6a9 | 5706 | |
7d60be94 | 5707 | value = build_int_cst_wide (type, val[1], val[0]); |
3e4093b6 | 5708 | add_pending_init (purpose, value); |
9dfcc8db BH |
5709 | } |
5710 | ||
3e4093b6 RS |
5711 | constructor_incremental = 0; |
5712 | } | |
de520661 | 5713 | |
3e4093b6 RS |
5714 | /* Return value of FIELD in pending initializer or zero if the field was |
5715 | not initialized yet. */ | |
5716 | ||
5717 | static tree | |
5718 | find_init_member (tree field) | |
5719 | { | |
5720 | struct init_node *p; | |
5721 | ||
5722 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
19d76e60 | 5723 | { |
3e4093b6 RS |
5724 | if (constructor_incremental |
5725 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
5726 | set_nonincremental_init (); | |
5727 | ||
5728 | p = constructor_pending_elts; | |
5729 | while (p) | |
19d76e60 | 5730 | { |
3e4093b6 RS |
5731 | if (tree_int_cst_lt (field, p->purpose)) |
5732 | p = p->left; | |
5733 | else if (tree_int_cst_lt (p->purpose, field)) | |
5734 | p = p->right; | |
5735 | else | |
5736 | return p->value; | |
19d76e60 | 5737 | } |
19d76e60 | 5738 | } |
3e4093b6 | 5739 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) |
de520661 | 5740 | { |
3e4093b6 | 5741 | tree bitpos = bit_position (field); |
de520661 | 5742 | |
3e4093b6 RS |
5743 | if (constructor_incremental |
5744 | && (!constructor_unfilled_fields | |
5745 | || tree_int_cst_lt (bitpos, | |
5746 | bit_position (constructor_unfilled_fields)))) | |
5747 | set_nonincremental_init (); | |
de520661 | 5748 | |
3e4093b6 RS |
5749 | p = constructor_pending_elts; |
5750 | while (p) | |
5751 | { | |
5752 | if (field == p->purpose) | |
5753 | return p->value; | |
5754 | else if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) | |
5755 | p = p->left; | |
5756 | else | |
5757 | p = p->right; | |
5758 | } | |
5759 | } | |
5760 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
de520661 | 5761 | { |
3e4093b6 RS |
5762 | if (constructor_elements |
5763 | && TREE_PURPOSE (constructor_elements) == field) | |
5764 | return TREE_VALUE (constructor_elements); | |
de520661 | 5765 | } |
3e4093b6 | 5766 | return 0; |
de520661 RS |
5767 | } |
5768 | ||
3e4093b6 RS |
5769 | /* "Output" the next constructor element. |
5770 | At top level, really output it to assembler code now. | |
5771 | Otherwise, collect it in a list from which we will make a CONSTRUCTOR. | |
5772 | TYPE is the data type that the containing data type wants here. | |
5773 | FIELD is the field (a FIELD_DECL) or the index that this element fills. | |
916c5919 JM |
5774 | If VALUE is a string constant, STRICT_STRING is true if it is |
5775 | unparenthesized or we should not warn here for it being parenthesized. | |
5776 | For other types of VALUE, STRICT_STRING is not used. | |
8b6a5902 | 5777 | |
3e4093b6 RS |
5778 | PENDING if non-nil means output pending elements that belong |
5779 | right after this element. (PENDING is normally 1; | |
5780 | it is 0 while outputting pending elements, to avoid recursion.) */ | |
8b6a5902 | 5781 | |
3e4093b6 | 5782 | static void |
916c5919 JM |
5783 | output_init_element (tree value, bool strict_string, tree type, tree field, |
5784 | int pending) | |
3e4093b6 | 5785 | { |
0a880880 | 5786 | if (type == error_mark_node || value == error_mark_node) |
8b6a5902 | 5787 | { |
3e4093b6 RS |
5788 | constructor_erroneous = 1; |
5789 | return; | |
8b6a5902 | 5790 | } |
3e4093b6 RS |
5791 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE |
5792 | || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
5793 | && !(TREE_CODE (value) == STRING_CST | |
5794 | && TREE_CODE (type) == ARRAY_TYPE | |
197463ae | 5795 | && INTEGRAL_TYPE_P (TREE_TYPE (type))) |
3e4093b6 | 5796 | && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)), |
132da1a5 | 5797 | TYPE_MAIN_VARIANT (type)))) |
3e4093b6 | 5798 | value = default_conversion (value); |
8b6a5902 | 5799 | |
3e4093b6 RS |
5800 | if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR |
5801 | && require_constant_value && !flag_isoc99 && pending) | |
8b6a5902 | 5802 | { |
3e4093b6 RS |
5803 | /* As an extension, allow initializing objects with static storage |
5804 | duration with compound literals (which are then treated just as | |
5805 | the brace enclosed list they contain). */ | |
5806 | tree decl = COMPOUND_LITERAL_EXPR_DECL (value); | |
5807 | value = DECL_INITIAL (decl); | |
8b6a5902 JJ |
5808 | } |
5809 | ||
3e4093b6 RS |
5810 | if (value == error_mark_node) |
5811 | constructor_erroneous = 1; | |
5812 | else if (!TREE_CONSTANT (value)) | |
5813 | constructor_constant = 0; | |
116df786 | 5814 | else if (!initializer_constant_valid_p (value, TREE_TYPE (value)) |
3e4093b6 RS |
5815 | || ((TREE_CODE (constructor_type) == RECORD_TYPE |
5816 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5817 | && DECL_C_BIT_FIELD (field) | |
5818 | && TREE_CODE (value) != INTEGER_CST)) | |
5819 | constructor_simple = 0; | |
5820 | ||
116df786 | 5821 | if (!initializer_constant_valid_p (value, TREE_TYPE (value))) |
8b6a5902 | 5822 | { |
116df786 RH |
5823 | if (require_constant_value) |
5824 | { | |
5825 | error_init ("initializer element is not constant"); | |
5826 | value = error_mark_node; | |
5827 | } | |
5828 | else if (require_constant_elements) | |
5829 | pedwarn ("initializer element is not computable at load time"); | |
8b6a5902 | 5830 | } |
3e4093b6 RS |
5831 | |
5832 | /* If this field is empty (and not at the end of structure), | |
5833 | don't do anything other than checking the initializer. */ | |
5834 | if (field | |
5835 | && (TREE_TYPE (field) == error_mark_node | |
5836 | || (COMPLETE_TYPE_P (TREE_TYPE (field)) | |
5837 | && integer_zerop (TYPE_SIZE (TREE_TYPE (field))) | |
5838 | && (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5839 | || TREE_CHAIN (field))))) | |
5840 | return; | |
5841 | ||
916c5919 | 5842 | value = digest_init (type, value, strict_string, require_constant_value); |
3e4093b6 | 5843 | if (value == error_mark_node) |
8b6a5902 | 5844 | { |
3e4093b6 RS |
5845 | constructor_erroneous = 1; |
5846 | return; | |
8b6a5902 | 5847 | } |
8b6a5902 | 5848 | |
3e4093b6 RS |
5849 | /* If this element doesn't come next in sequence, |
5850 | put it on constructor_pending_elts. */ | |
5851 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5852 | && (!constructor_incremental | |
5853 | || !tree_int_cst_equal (field, constructor_unfilled_index))) | |
8b6a5902 | 5854 | { |
3e4093b6 RS |
5855 | if (constructor_incremental |
5856 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
5857 | set_nonincremental_init (); | |
5858 | ||
5859 | add_pending_init (field, value); | |
5860 | return; | |
8b6a5902 | 5861 | } |
3e4093b6 RS |
5862 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
5863 | && (!constructor_incremental | |
5864 | || field != constructor_unfilled_fields)) | |
8b6a5902 | 5865 | { |
3e4093b6 RS |
5866 | /* We do this for records but not for unions. In a union, |
5867 | no matter which field is specified, it can be initialized | |
5868 | right away since it starts at the beginning of the union. */ | |
5869 | if (constructor_incremental) | |
5870 | { | |
5871 | if (!constructor_unfilled_fields) | |
5872 | set_nonincremental_init (); | |
5873 | else | |
5874 | { | |
5875 | tree bitpos, unfillpos; | |
5876 | ||
5877 | bitpos = bit_position (field); | |
5878 | unfillpos = bit_position (constructor_unfilled_fields); | |
5879 | ||
5880 | if (tree_int_cst_lt (bitpos, unfillpos)) | |
5881 | set_nonincremental_init (); | |
5882 | } | |
5883 | } | |
5884 | ||
5885 | add_pending_init (field, value); | |
5886 | return; | |
8b6a5902 | 5887 | } |
3e4093b6 RS |
5888 | else if (TREE_CODE (constructor_type) == UNION_TYPE |
5889 | && constructor_elements) | |
5890 | { | |
5891 | if (TREE_SIDE_EFFECTS (TREE_VALUE (constructor_elements))) | |
5892 | warning_init ("initialized field with side-effects overwritten"); | |
8b6a5902 | 5893 | |
3e4093b6 RS |
5894 | /* We can have just one union field set. */ |
5895 | constructor_elements = 0; | |
5896 | } | |
8b6a5902 | 5897 | |
3e4093b6 RS |
5898 | /* Otherwise, output this element either to |
5899 | constructor_elements or to the assembler file. */ | |
8b6a5902 | 5900 | |
3e4093b6 RS |
5901 | if (field && TREE_CODE (field) == INTEGER_CST) |
5902 | field = copy_node (field); | |
5903 | constructor_elements | |
5904 | = tree_cons (field, value, constructor_elements); | |
8b6a5902 | 5905 | |
3e4093b6 RS |
5906 | /* Advance the variable that indicates sequential elements output. */ |
5907 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5908 | constructor_unfilled_index | |
5909 | = size_binop (PLUS_EXPR, constructor_unfilled_index, | |
5910 | bitsize_one_node); | |
5911 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5912 | { | |
5913 | constructor_unfilled_fields | |
5914 | = TREE_CHAIN (constructor_unfilled_fields); | |
8b6a5902 | 5915 | |
3e4093b6 RS |
5916 | /* Skip any nameless bit fields. */ |
5917 | while (constructor_unfilled_fields != 0 | |
5918 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
5919 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
5920 | constructor_unfilled_fields = | |
5921 | TREE_CHAIN (constructor_unfilled_fields); | |
5922 | } | |
5923 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
5924 | constructor_unfilled_fields = 0; | |
de520661 | 5925 | |
3e4093b6 RS |
5926 | /* Now output any pending elements which have become next. */ |
5927 | if (pending) | |
5928 | output_pending_init_elements (0); | |
5929 | } | |
8b6a5902 | 5930 | |
3e4093b6 RS |
5931 | /* Output any pending elements which have become next. |
5932 | As we output elements, constructor_unfilled_{fields,index} | |
5933 | advances, which may cause other elements to become next; | |
5934 | if so, they too are output. | |
8b6a5902 | 5935 | |
3e4093b6 RS |
5936 | If ALL is 0, we return when there are |
5937 | no more pending elements to output now. | |
665f2503 | 5938 | |
3e4093b6 RS |
5939 | If ALL is 1, we output space as necessary so that |
5940 | we can output all the pending elements. */ | |
19d76e60 | 5941 | |
3e4093b6 RS |
5942 | static void |
5943 | output_pending_init_elements (int all) | |
5944 | { | |
5945 | struct init_node *elt = constructor_pending_elts; | |
5946 | tree next; | |
de520661 | 5947 | |
3e4093b6 RS |
5948 | retry: |
5949 | ||
ba228239 | 5950 | /* Look through the whole pending tree. |
3e4093b6 RS |
5951 | If we find an element that should be output now, |
5952 | output it. Otherwise, set NEXT to the element | |
5953 | that comes first among those still pending. */ | |
5954 | ||
5955 | next = 0; | |
5956 | while (elt) | |
5957 | { | |
5958 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
8b6a5902 | 5959 | { |
3e4093b6 RS |
5960 | if (tree_int_cst_equal (elt->purpose, |
5961 | constructor_unfilled_index)) | |
916c5919 | 5962 | output_init_element (elt->value, true, |
3e4093b6 RS |
5963 | TREE_TYPE (constructor_type), |
5964 | constructor_unfilled_index, 0); | |
5965 | else if (tree_int_cst_lt (constructor_unfilled_index, | |
5966 | elt->purpose)) | |
8b6a5902 | 5967 | { |
3e4093b6 RS |
5968 | /* Advance to the next smaller node. */ |
5969 | if (elt->left) | |
5970 | elt = elt->left; | |
5971 | else | |
5972 | { | |
5973 | /* We have reached the smallest node bigger than the | |
5974 | current unfilled index. Fill the space first. */ | |
5975 | next = elt->purpose; | |
5976 | break; | |
5977 | } | |
8b6a5902 | 5978 | } |
ce662d4c JJ |
5979 | else |
5980 | { | |
3e4093b6 RS |
5981 | /* Advance to the next bigger node. */ |
5982 | if (elt->right) | |
5983 | elt = elt->right; | |
5984 | else | |
ce662d4c | 5985 | { |
3e4093b6 RS |
5986 | /* We have reached the biggest node in a subtree. Find |
5987 | the parent of it, which is the next bigger node. */ | |
5988 | while (elt->parent && elt->parent->right == elt) | |
5989 | elt = elt->parent; | |
5990 | elt = elt->parent; | |
5991 | if (elt && tree_int_cst_lt (constructor_unfilled_index, | |
5992 | elt->purpose)) | |
5993 | { | |
5994 | next = elt->purpose; | |
5995 | break; | |
5996 | } | |
ce662d4c JJ |
5997 | } |
5998 | } | |
8b6a5902 | 5999 | } |
3e4093b6 RS |
6000 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
6001 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6002 | { | |
6003 | tree ctor_unfilled_bitpos, elt_bitpos; | |
ce662d4c | 6004 | |
3e4093b6 RS |
6005 | /* If the current record is complete we are done. */ |
6006 | if (constructor_unfilled_fields == 0) | |
6007 | break; | |
de520661 | 6008 | |
3e4093b6 RS |
6009 | ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields); |
6010 | elt_bitpos = bit_position (elt->purpose); | |
6011 | /* We can't compare fields here because there might be empty | |
6012 | fields in between. */ | |
6013 | if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos)) | |
6014 | { | |
6015 | constructor_unfilled_fields = elt->purpose; | |
916c5919 | 6016 | output_init_element (elt->value, true, TREE_TYPE (elt->purpose), |
3e4093b6 RS |
6017 | elt->purpose, 0); |
6018 | } | |
6019 | else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos)) | |
6020 | { | |
6021 | /* Advance to the next smaller node. */ | |
6022 | if (elt->left) | |
6023 | elt = elt->left; | |
6024 | else | |
6025 | { | |
6026 | /* We have reached the smallest node bigger than the | |
6027 | current unfilled field. Fill the space first. */ | |
6028 | next = elt->purpose; | |
6029 | break; | |
6030 | } | |
6031 | } | |
6032 | else | |
6033 | { | |
6034 | /* Advance to the next bigger node. */ | |
6035 | if (elt->right) | |
6036 | elt = elt->right; | |
6037 | else | |
6038 | { | |
6039 | /* We have reached the biggest node in a subtree. Find | |
6040 | the parent of it, which is the next bigger node. */ | |
6041 | while (elt->parent && elt->parent->right == elt) | |
6042 | elt = elt->parent; | |
6043 | elt = elt->parent; | |
6044 | if (elt | |
6045 | && (tree_int_cst_lt (ctor_unfilled_bitpos, | |
6046 | bit_position (elt->purpose)))) | |
6047 | { | |
6048 | next = elt->purpose; | |
6049 | break; | |
6050 | } | |
6051 | } | |
6052 | } | |
6053 | } | |
6054 | } | |
de520661 | 6055 | |
3e4093b6 RS |
6056 | /* Ordinarily return, but not if we want to output all |
6057 | and there are elements left. */ | |
3f75a254 | 6058 | if (!(all && next != 0)) |
e5cfb88f RK |
6059 | return; |
6060 | ||
3e4093b6 RS |
6061 | /* If it's not incremental, just skip over the gap, so that after |
6062 | jumping to retry we will output the next successive element. */ | |
6063 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6064 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6065 | constructor_unfilled_fields = next; | |
6066 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6067 | constructor_unfilled_index = next; | |
de520661 | 6068 | |
3e4093b6 RS |
6069 | /* ELT now points to the node in the pending tree with the next |
6070 | initializer to output. */ | |
6071 | goto retry; | |
de520661 RS |
6072 | } |
6073 | \f | |
3e4093b6 RS |
6074 | /* Add one non-braced element to the current constructor level. |
6075 | This adjusts the current position within the constructor's type. | |
6076 | This may also start or terminate implicit levels | |
6077 | to handle a partly-braced initializer. | |
e5e809f4 | 6078 | |
3e4093b6 RS |
6079 | Once this has found the correct level for the new element, |
6080 | it calls output_init_element. */ | |
6081 | ||
6082 | void | |
916c5919 | 6083 | process_init_element (struct c_expr value) |
e5e809f4 | 6084 | { |
916c5919 JM |
6085 | tree orig_value = value.value; |
6086 | int string_flag = orig_value != 0 && TREE_CODE (orig_value) == STRING_CST; | |
6087 | bool strict_string = value.original_code == STRING_CST; | |
e5e809f4 | 6088 | |
3e4093b6 RS |
6089 | designator_depth = 0; |
6090 | designator_errorneous = 0; | |
e5e809f4 | 6091 | |
3e4093b6 RS |
6092 | /* Handle superfluous braces around string cst as in |
6093 | char x[] = {"foo"}; */ | |
6094 | if (string_flag | |
6095 | && constructor_type | |
6096 | && TREE_CODE (constructor_type) == ARRAY_TYPE | |
197463ae | 6097 | && INTEGRAL_TYPE_P (TREE_TYPE (constructor_type)) |
3e4093b6 | 6098 | && integer_zerop (constructor_unfilled_index)) |
e5e809f4 | 6099 | { |
916c5919 | 6100 | if (constructor_stack->replacement_value.value) |
3e4093b6 RS |
6101 | error_init ("excess elements in char array initializer"); |
6102 | constructor_stack->replacement_value = value; | |
6103 | return; | |
e5e809f4 | 6104 | } |
8b6a5902 | 6105 | |
916c5919 | 6106 | if (constructor_stack->replacement_value.value != 0) |
3e4093b6 RS |
6107 | { |
6108 | error_init ("excess elements in struct initializer"); | |
6109 | return; | |
e5e809f4 JL |
6110 | } |
6111 | ||
3e4093b6 RS |
6112 | /* Ignore elements of a brace group if it is entirely superfluous |
6113 | and has already been diagnosed. */ | |
6114 | if (constructor_type == 0) | |
6115 | return; | |
e5e809f4 | 6116 | |
3e4093b6 RS |
6117 | /* If we've exhausted any levels that didn't have braces, |
6118 | pop them now. */ | |
6119 | while (constructor_stack->implicit) | |
6120 | { | |
6121 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6122 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6123 | && constructor_fields == 0) | |
6124 | process_init_element (pop_init_level (1)); | |
6125 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6126 | && (constructor_max_index == 0 | |
6127 | || tree_int_cst_lt (constructor_max_index, | |
6128 | constructor_index))) | |
6129 | process_init_element (pop_init_level (1)); | |
6130 | else | |
6131 | break; | |
6132 | } | |
e5e809f4 | 6133 | |
3e4093b6 RS |
6134 | /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */ |
6135 | if (constructor_range_stack) | |
e5e809f4 | 6136 | { |
3e4093b6 RS |
6137 | /* If value is a compound literal and we'll be just using its |
6138 | content, don't put it into a SAVE_EXPR. */ | |
916c5919 | 6139 | if (TREE_CODE (value.value) != COMPOUND_LITERAL_EXPR |
3e4093b6 RS |
6140 | || !require_constant_value |
6141 | || flag_isoc99) | |
916c5919 | 6142 | value.value = save_expr (value.value); |
3e4093b6 | 6143 | } |
e5e809f4 | 6144 | |
3e4093b6 RS |
6145 | while (1) |
6146 | { | |
6147 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
e5e809f4 | 6148 | { |
3e4093b6 RS |
6149 | tree fieldtype; |
6150 | enum tree_code fieldcode; | |
e5e809f4 | 6151 | |
3e4093b6 RS |
6152 | if (constructor_fields == 0) |
6153 | { | |
6154 | pedwarn_init ("excess elements in struct initializer"); | |
6155 | break; | |
6156 | } | |
e5e809f4 | 6157 | |
3e4093b6 RS |
6158 | fieldtype = TREE_TYPE (constructor_fields); |
6159 | if (fieldtype != error_mark_node) | |
6160 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
6161 | fieldcode = TREE_CODE (fieldtype); | |
e5e809f4 | 6162 | |
3e4093b6 RS |
6163 | /* Error for non-static initialization of a flexible array member. */ |
6164 | if (fieldcode == ARRAY_TYPE | |
6165 | && !require_constant_value | |
6166 | && TYPE_SIZE (fieldtype) == NULL_TREE | |
6167 | && TREE_CHAIN (constructor_fields) == NULL_TREE) | |
6168 | { | |
6169 | error_init ("non-static initialization of a flexible array member"); | |
6170 | break; | |
6171 | } | |
e5e809f4 | 6172 | |
3e4093b6 | 6173 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6174 | if (value.value != 0 |
3e4093b6 | 6175 | && fieldcode == ARRAY_TYPE |
197463ae | 6176 | && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype)) |
3e4093b6 | 6177 | && string_flag) |
916c5919 | 6178 | value.value = orig_value; |
3e4093b6 RS |
6179 | /* Otherwise, if we have come to a subaggregate, |
6180 | and we don't have an element of its type, push into it. */ | |
0953878d | 6181 | else if (value.value != 0 |
916c5919 JM |
6182 | && value.value != error_mark_node |
6183 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype | |
3e4093b6 RS |
6184 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE |
6185 | || fieldcode == UNION_TYPE)) | |
6186 | { | |
6187 | push_init_level (1); | |
6188 | continue; | |
6189 | } | |
e5e809f4 | 6190 | |
916c5919 | 6191 | if (value.value) |
3e4093b6 RS |
6192 | { |
6193 | push_member_name (constructor_fields); | |
916c5919 JM |
6194 | output_init_element (value.value, strict_string, |
6195 | fieldtype, constructor_fields, 1); | |
3e4093b6 | 6196 | RESTORE_SPELLING_DEPTH (constructor_depth); |
e5e809f4 JL |
6197 | } |
6198 | else | |
3e4093b6 RS |
6199 | /* Do the bookkeeping for an element that was |
6200 | directly output as a constructor. */ | |
e5e809f4 | 6201 | { |
3e4093b6 RS |
6202 | /* For a record, keep track of end position of last field. */ |
6203 | if (DECL_SIZE (constructor_fields)) | |
6204 | constructor_bit_index | |
6205 | = size_binop (PLUS_EXPR, | |
6206 | bit_position (constructor_fields), | |
6207 | DECL_SIZE (constructor_fields)); | |
6208 | ||
6209 | /* If the current field was the first one not yet written out, | |
6210 | it isn't now, so update. */ | |
6211 | if (constructor_unfilled_fields == constructor_fields) | |
6212 | { | |
6213 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
6214 | /* Skip any nameless bit fields. */ | |
6215 | while (constructor_unfilled_fields != 0 | |
6216 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6217 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6218 | constructor_unfilled_fields = | |
6219 | TREE_CHAIN (constructor_unfilled_fields); | |
6220 | } | |
e5e809f4 | 6221 | } |
3e4093b6 RS |
6222 | |
6223 | constructor_fields = TREE_CHAIN (constructor_fields); | |
6224 | /* Skip any nameless bit fields at the beginning. */ | |
6225 | while (constructor_fields != 0 | |
6226 | && DECL_C_BIT_FIELD (constructor_fields) | |
6227 | && DECL_NAME (constructor_fields) == 0) | |
6228 | constructor_fields = TREE_CHAIN (constructor_fields); | |
e5e809f4 | 6229 | } |
3e4093b6 | 6230 | else if (TREE_CODE (constructor_type) == UNION_TYPE) |
e5e809f4 | 6231 | { |
3e4093b6 RS |
6232 | tree fieldtype; |
6233 | enum tree_code fieldcode; | |
e5e809f4 | 6234 | |
3e4093b6 RS |
6235 | if (constructor_fields == 0) |
6236 | { | |
6237 | pedwarn_init ("excess elements in union initializer"); | |
6238 | break; | |
6239 | } | |
e5e809f4 | 6240 | |
3e4093b6 RS |
6241 | fieldtype = TREE_TYPE (constructor_fields); |
6242 | if (fieldtype != error_mark_node) | |
6243 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
6244 | fieldcode = TREE_CODE (fieldtype); | |
e5e809f4 | 6245 | |
3e4093b6 RS |
6246 | /* Warn that traditional C rejects initialization of unions. |
6247 | We skip the warning if the value is zero. This is done | |
6248 | under the assumption that the zero initializer in user | |
6249 | code appears conditioned on e.g. __STDC__ to avoid | |
6250 | "missing initializer" warnings and relies on default | |
6251 | initialization to zero in the traditional C case. | |
6252 | We also skip the warning if the initializer is designated, | |
6253 | again on the assumption that this must be conditional on | |
6254 | __STDC__ anyway (and we've already complained about the | |
6255 | member-designator already). */ | |
6256 | if (warn_traditional && !in_system_header && !constructor_designated | |
916c5919 JM |
6257 | && !(value.value && (integer_zerop (value.value) |
6258 | || real_zerop (value.value)))) | |
d4ee4d25 | 6259 | warning (0, "traditional C rejects initialization of unions"); |
e5e809f4 | 6260 | |
3e4093b6 | 6261 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6262 | if (value.value != 0 |
3e4093b6 | 6263 | && fieldcode == ARRAY_TYPE |
197463ae | 6264 | && INTEGRAL_TYPE_P (TREE_TYPE (fieldtype)) |
3e4093b6 | 6265 | && string_flag) |
916c5919 | 6266 | value.value = orig_value; |
3e4093b6 RS |
6267 | /* Otherwise, if we have come to a subaggregate, |
6268 | and we don't have an element of its type, push into it. */ | |
0953878d | 6269 | else if (value.value != 0 |
916c5919 JM |
6270 | && value.value != error_mark_node |
6271 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != fieldtype | |
3e4093b6 RS |
6272 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE |
6273 | || fieldcode == UNION_TYPE)) | |
6274 | { | |
6275 | push_init_level (1); | |
6276 | continue; | |
6277 | } | |
e5e809f4 | 6278 | |
916c5919 | 6279 | if (value.value) |
3e4093b6 RS |
6280 | { |
6281 | push_member_name (constructor_fields); | |
916c5919 JM |
6282 | output_init_element (value.value, strict_string, |
6283 | fieldtype, constructor_fields, 1); | |
3e4093b6 | 6284 | RESTORE_SPELLING_DEPTH (constructor_depth); |
e5e809f4 JL |
6285 | } |
6286 | else | |
3e4093b6 RS |
6287 | /* Do the bookkeeping for an element that was |
6288 | directly output as a constructor. */ | |
e5e809f4 | 6289 | { |
3e4093b6 RS |
6290 | constructor_bit_index = DECL_SIZE (constructor_fields); |
6291 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
e5e809f4 | 6292 | } |
e5e809f4 | 6293 | |
3e4093b6 RS |
6294 | constructor_fields = 0; |
6295 | } | |
6296 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6297 | { | |
6298 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6299 | enum tree_code eltcode = TREE_CODE (elttype); | |
e5e809f4 | 6300 | |
3e4093b6 | 6301 | /* Accept a string constant to initialize a subarray. */ |
916c5919 | 6302 | if (value.value != 0 |
3e4093b6 | 6303 | && eltcode == ARRAY_TYPE |
197463ae | 6304 | && INTEGRAL_TYPE_P (TREE_TYPE (elttype)) |
3e4093b6 | 6305 | && string_flag) |
916c5919 | 6306 | value.value = orig_value; |
3e4093b6 RS |
6307 | /* Otherwise, if we have come to a subaggregate, |
6308 | and we don't have an element of its type, push into it. */ | |
0953878d | 6309 | else if (value.value != 0 |
916c5919 JM |
6310 | && value.value != error_mark_node |
6311 | && TYPE_MAIN_VARIANT (TREE_TYPE (value.value)) != elttype | |
3e4093b6 RS |
6312 | && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE |
6313 | || eltcode == UNION_TYPE)) | |
6314 | { | |
6315 | push_init_level (1); | |
6316 | continue; | |
6317 | } | |
8b6a5902 | 6318 | |
3e4093b6 RS |
6319 | if (constructor_max_index != 0 |
6320 | && (tree_int_cst_lt (constructor_max_index, constructor_index) | |
6321 | || integer_all_onesp (constructor_max_index))) | |
6322 | { | |
6323 | pedwarn_init ("excess elements in array initializer"); | |
6324 | break; | |
6325 | } | |
8b6a5902 | 6326 | |
3e4093b6 | 6327 | /* Now output the actual element. */ |
916c5919 | 6328 | if (value.value) |
3e4093b6 RS |
6329 | { |
6330 | push_array_bounds (tree_low_cst (constructor_index, 0)); | |
916c5919 JM |
6331 | output_init_element (value.value, strict_string, |
6332 | elttype, constructor_index, 1); | |
3e4093b6 RS |
6333 | RESTORE_SPELLING_DEPTH (constructor_depth); |
6334 | } | |
2f6e4e97 | 6335 | |
3e4093b6 RS |
6336 | constructor_index |
6337 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
8b6a5902 | 6338 | |
916c5919 | 6339 | if (!value.value) |
3e4093b6 RS |
6340 | /* If we are doing the bookkeeping for an element that was |
6341 | directly output as a constructor, we must update | |
6342 | constructor_unfilled_index. */ | |
6343 | constructor_unfilled_index = constructor_index; | |
6344 | } | |
6345 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) | |
6346 | { | |
6347 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
8b6a5902 | 6348 | |
3e4093b6 RS |
6349 | /* Do a basic check of initializer size. Note that vectors |
6350 | always have a fixed size derived from their type. */ | |
6351 | if (tree_int_cst_lt (constructor_max_index, constructor_index)) | |
6352 | { | |
6353 | pedwarn_init ("excess elements in vector initializer"); | |
6354 | break; | |
6355 | } | |
8b6a5902 | 6356 | |
3e4093b6 | 6357 | /* Now output the actual element. */ |
916c5919 JM |
6358 | if (value.value) |
6359 | output_init_element (value.value, strict_string, | |
6360 | elttype, constructor_index, 1); | |
8b6a5902 | 6361 | |
3e4093b6 RS |
6362 | constructor_index |
6363 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
8b6a5902 | 6364 | |
916c5919 | 6365 | if (!value.value) |
3e4093b6 RS |
6366 | /* If we are doing the bookkeeping for an element that was |
6367 | directly output as a constructor, we must update | |
6368 | constructor_unfilled_index. */ | |
6369 | constructor_unfilled_index = constructor_index; | |
6370 | } | |
8b6a5902 | 6371 | |
3e4093b6 RS |
6372 | /* Handle the sole element allowed in a braced initializer |
6373 | for a scalar variable. */ | |
b4519d39 SB |
6374 | else if (constructor_type != error_mark_node |
6375 | && constructor_fields == 0) | |
8b6a5902 | 6376 | { |
3e4093b6 RS |
6377 | pedwarn_init ("excess elements in scalar initializer"); |
6378 | break; | |
8b6a5902 JJ |
6379 | } |
6380 | else | |
6381 | { | |
916c5919 JM |
6382 | if (value.value) |
6383 | output_init_element (value.value, strict_string, | |
6384 | constructor_type, NULL_TREE, 1); | |
3e4093b6 | 6385 | constructor_fields = 0; |
8b6a5902 JJ |
6386 | } |
6387 | ||
3e4093b6 RS |
6388 | /* Handle range initializers either at this level or anywhere higher |
6389 | in the designator stack. */ | |
6390 | if (constructor_range_stack) | |
8b6a5902 | 6391 | { |
3e4093b6 RS |
6392 | struct constructor_range_stack *p, *range_stack; |
6393 | int finish = 0; | |
6394 | ||
6395 | range_stack = constructor_range_stack; | |
6396 | constructor_range_stack = 0; | |
6397 | while (constructor_stack != range_stack->stack) | |
8b6a5902 | 6398 | { |
366de0ce | 6399 | gcc_assert (constructor_stack->implicit); |
3e4093b6 | 6400 | process_init_element (pop_init_level (1)); |
8b6a5902 | 6401 | } |
3e4093b6 RS |
6402 | for (p = range_stack; |
6403 | !p->range_end || tree_int_cst_equal (p->index, p->range_end); | |
6404 | p = p->prev) | |
8b6a5902 | 6405 | { |
366de0ce | 6406 | gcc_assert (constructor_stack->implicit); |
3e4093b6 | 6407 | process_init_element (pop_init_level (1)); |
8b6a5902 | 6408 | } |
3e4093b6 RS |
6409 | |
6410 | p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node); | |
6411 | if (tree_int_cst_equal (p->index, p->range_end) && !p->prev) | |
6412 | finish = 1; | |
6413 | ||
6414 | while (1) | |
6415 | { | |
6416 | constructor_index = p->index; | |
6417 | constructor_fields = p->fields; | |
6418 | if (finish && p->range_end && p->index == p->range_start) | |
6419 | { | |
6420 | finish = 0; | |
6421 | p->prev = 0; | |
6422 | } | |
6423 | p = p->next; | |
6424 | if (!p) | |
6425 | break; | |
6426 | push_init_level (2); | |
6427 | p->stack = constructor_stack; | |
6428 | if (p->range_end && tree_int_cst_equal (p->index, p->range_end)) | |
6429 | p->index = p->range_start; | |
6430 | } | |
6431 | ||
6432 | if (!finish) | |
6433 | constructor_range_stack = range_stack; | |
6434 | continue; | |
8b6a5902 JJ |
6435 | } |
6436 | ||
3e4093b6 | 6437 | break; |
8b6a5902 JJ |
6438 | } |
6439 | ||
3e4093b6 RS |
6440 | constructor_range_stack = 0; |
6441 | } | |
6442 | \f | |
9f0e2d86 ZW |
6443 | /* Build a complete asm-statement, whose components are a CV_QUALIFIER |
6444 | (guaranteed to be 'volatile' or null) and ARGS (represented using | |
e130a54b | 6445 | an ASM_EXPR node). */ |
3e4093b6 | 6446 | tree |
9f0e2d86 | 6447 | build_asm_stmt (tree cv_qualifier, tree args) |
3e4093b6 | 6448 | { |
6de9cd9a DN |
6449 | if (!ASM_VOLATILE_P (args) && cv_qualifier) |
6450 | ASM_VOLATILE_P (args) = 1; | |
9f0e2d86 | 6451 | return add_stmt (args); |
8b6a5902 JJ |
6452 | } |
6453 | ||
9f0e2d86 ZW |
6454 | /* Build an asm-expr, whose components are a STRING, some OUTPUTS, |
6455 | some INPUTS, and some CLOBBERS. The latter three may be NULL. | |
6456 | SIMPLE indicates whether there was anything at all after the | |
6457 | string in the asm expression -- asm("blah") and asm("blah" : ) | |
e130a54b | 6458 | are subtly different. We use a ASM_EXPR node to represent this. */ |
3e4093b6 | 6459 | tree |
9f0e2d86 ZW |
6460 | build_asm_expr (tree string, tree outputs, tree inputs, tree clobbers, |
6461 | bool simple) | |
e5e809f4 | 6462 | { |
3e4093b6 | 6463 | tree tail; |
9f0e2d86 | 6464 | tree args; |
6de9cd9a DN |
6465 | int i; |
6466 | const char *constraint; | |
74f0c611 | 6467 | const char **oconstraints; |
6de9cd9a | 6468 | bool allows_mem, allows_reg, is_inout; |
74f0c611 | 6469 | int ninputs, noutputs; |
6de9cd9a DN |
6470 | |
6471 | ninputs = list_length (inputs); | |
6472 | noutputs = list_length (outputs); | |
74f0c611 RH |
6473 | oconstraints = (const char **) alloca (noutputs * sizeof (const char *)); |
6474 | ||
6475 | string = resolve_asm_operand_names (string, outputs, inputs); | |
3e4093b6 | 6476 | |
6de9cd9a DN |
6477 | /* Remove output conversions that change the type but not the mode. */ |
6478 | for (i = 0, tail = outputs; tail; ++i, tail = TREE_CHAIN (tail)) | |
e5e809f4 | 6479 | { |
3e4093b6 | 6480 | tree output = TREE_VALUE (tail); |
74f0c611 RH |
6481 | |
6482 | /* ??? Really, this should not be here. Users should be using a | |
6483 | proper lvalue, dammit. But there's a long history of using casts | |
6484 | in the output operands. In cases like longlong.h, this becomes a | |
6485 | primitive form of typechecking -- if the cast can be removed, then | |
6486 | the output operand had a type of the proper width; otherwise we'll | |
6487 | get an error. Gross, but ... */ | |
3e4093b6 | 6488 | STRIP_NOPS (output); |
74f0c611 RH |
6489 | |
6490 | if (!lvalue_or_else (output, lv_asm)) | |
6491 | output = error_mark_node; | |
8b6a5902 | 6492 | |
6de9cd9a | 6493 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); |
74f0c611 RH |
6494 | oconstraints[i] = constraint; |
6495 | ||
6496 | if (parse_output_constraint (&constraint, i, ninputs, noutputs, | |
6497 | &allows_mem, &allows_reg, &is_inout)) | |
6498 | { | |
6499 | /* If the operand is going to end up in memory, | |
6500 | mark it addressable. */ | |
6501 | if (!allows_reg && !c_mark_addressable (output)) | |
6502 | output = error_mark_node; | |
6503 | } | |
6504 | else | |
6505 | output = error_mark_node; | |
3e4093b6 | 6506 | |
74f0c611 | 6507 | TREE_VALUE (tail) = output; |
8b6a5902 | 6508 | } |
3e4093b6 RS |
6509 | |
6510 | /* Perform default conversions on array and function inputs. | |
6511 | Don't do this for other types as it would screw up operands | |
6512 | expected to be in memory. */ | |
74f0c611 RH |
6513 | for (i = 0, tail = inputs; tail; ++i, tail = TREE_CHAIN (tail)) |
6514 | { | |
6515 | tree input; | |
6516 | ||
6517 | constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); | |
6518 | input = TREE_VALUE (tail); | |
6519 | ||
6520 | input = default_function_array_conversion (input); | |
6521 | ||
6522 | if (parse_input_constraint (&constraint, i, ninputs, noutputs, 0, | |
6523 | oconstraints, &allows_mem, &allows_reg)) | |
6524 | { | |
6525 | /* If the operand is going to end up in memory, | |
6526 | mark it addressable. */ | |
b4c33883 AP |
6527 | if (!allows_reg && allows_mem) |
6528 | { | |
6529 | /* Strip the nops as we allow this case. FIXME, this really | |
6530 | should be rejected or made deprecated. */ | |
6531 | STRIP_NOPS (input); | |
6532 | if (!c_mark_addressable (input)) | |
6533 | input = error_mark_node; | |
6534 | } | |
74f0c611 RH |
6535 | } |
6536 | else | |
6537 | input = error_mark_node; | |
6538 | ||
6539 | TREE_VALUE (tail) = input; | |
6540 | } | |
3e4093b6 | 6541 | |
e130a54b | 6542 | args = build_stmt (ASM_EXPR, string, outputs, inputs, clobbers); |
9f0e2d86 ZW |
6543 | |
6544 | /* Simple asm statements are treated as volatile. */ | |
6545 | if (simple) | |
6546 | { | |
6de9cd9a | 6547 | ASM_VOLATILE_P (args) = 1; |
9f0e2d86 ZW |
6548 | ASM_INPUT_P (args) = 1; |
6549 | } | |
74f0c611 | 6550 | |
9f0e2d86 | 6551 | return args; |
e5e809f4 | 6552 | } |
3e4093b6 | 6553 | \f |
506e2710 RH |
6554 | /* Generate a goto statement to LABEL. */ |
6555 | ||
6556 | tree | |
6557 | c_finish_goto_label (tree label) | |
6558 | { | |
6559 | tree decl = lookup_label (label); | |
6560 | if (!decl) | |
6561 | return NULL_TREE; | |
6562 | ||
16ef3acc JM |
6563 | if (C_DECL_UNJUMPABLE_STMT_EXPR (decl)) |
6564 | { | |
6565 | error ("jump into statement expression"); | |
6566 | return NULL_TREE; | |
6567 | } | |
6568 | ||
187230a7 JM |
6569 | if (C_DECL_UNJUMPABLE_VM (decl)) |
6570 | { | |
6571 | error ("jump into scope of identifier with variably modified type"); | |
6572 | return NULL_TREE; | |
6573 | } | |
6574 | ||
16ef3acc JM |
6575 | if (!C_DECL_UNDEFINABLE_STMT_EXPR (decl)) |
6576 | { | |
6577 | /* No jump from outside this statement expression context, so | |
6578 | record that there is a jump from within this context. */ | |
6579 | struct c_label_list *nlist; | |
6580 | nlist = XOBNEW (&parser_obstack, struct c_label_list); | |
187230a7 JM |
6581 | nlist->next = label_context_stack_se->labels_used; |
6582 | nlist->label = decl; | |
6583 | label_context_stack_se->labels_used = nlist; | |
6584 | } | |
6585 | ||
6586 | if (!C_DECL_UNDEFINABLE_VM (decl)) | |
6587 | { | |
6588 | /* No jump from outside this context context of identifiers with | |
6589 | variably modified type, so record that there is a jump from | |
6590 | within this context. */ | |
6591 | struct c_label_list *nlist; | |
6592 | nlist = XOBNEW (&parser_obstack, struct c_label_list); | |
6593 | nlist->next = label_context_stack_vm->labels_used; | |
16ef3acc | 6594 | nlist->label = decl; |
187230a7 | 6595 | label_context_stack_vm->labels_used = nlist; |
16ef3acc JM |
6596 | } |
6597 | ||
506e2710 | 6598 | TREE_USED (decl) = 1; |
53fb4de3 | 6599 | return add_stmt (build1 (GOTO_EXPR, void_type_node, decl)); |
506e2710 RH |
6600 | } |
6601 | ||
6602 | /* Generate a computed goto statement to EXPR. */ | |
6603 | ||
6604 | tree | |
6605 | c_finish_goto_ptr (tree expr) | |
6606 | { | |
6607 | if (pedantic) | |
bda67431 | 6608 | pedwarn ("ISO C forbids %<goto *expr;%>"); |
506e2710 | 6609 | expr = convert (ptr_type_node, expr); |
53fb4de3 | 6610 | return add_stmt (build1 (GOTO_EXPR, void_type_node, expr)); |
506e2710 RH |
6611 | } |
6612 | ||
5088b058 RH |
6613 | /* Generate a C `return' statement. RETVAL is the expression for what |
6614 | to return, or a null pointer for `return;' with no value. */ | |
de520661 | 6615 | |
506e2710 | 6616 | tree |
5088b058 | 6617 | c_finish_return (tree retval) |
3e4093b6 RS |
6618 | { |
6619 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
6620 | ||
6621 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
d4ee4d25 | 6622 | warning (0, "function declared %<noreturn%> has a %<return%> statement"); |
3e4093b6 RS |
6623 | |
6624 | if (!retval) | |
de520661 | 6625 | { |
3e4093b6 RS |
6626 | current_function_returns_null = 1; |
6627 | if ((warn_return_type || flag_isoc99) | |
6628 | && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
bda67431 JM |
6629 | pedwarn_c99 ("%<return%> with no value, in " |
6630 | "function returning non-void"); | |
400fbf9f | 6631 | } |
3e4093b6 | 6632 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) |
de520661 | 6633 | { |
3e4093b6 RS |
6634 | current_function_returns_null = 1; |
6635 | if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
bda67431 | 6636 | pedwarn ("%<return%> with a value, in function returning void"); |
de520661 | 6637 | } |
3e4093b6 | 6638 | else |
de520661 | 6639 | { |
2ac2f164 | 6640 | tree t = convert_for_assignment (valtype, retval, ic_return, |
3e4093b6 RS |
6641 | NULL_TREE, NULL_TREE, 0); |
6642 | tree res = DECL_RESULT (current_function_decl); | |
6643 | tree inner; | |
6644 | ||
6645 | current_function_returns_value = 1; | |
6646 | if (t == error_mark_node) | |
506e2710 | 6647 | return NULL_TREE; |
3e4093b6 RS |
6648 | |
6649 | inner = t = convert (TREE_TYPE (res), t); | |
6650 | ||
6651 | /* Strip any conversions, additions, and subtractions, and see if | |
6652 | we are returning the address of a local variable. Warn if so. */ | |
6653 | while (1) | |
8b6a5902 | 6654 | { |
3e4093b6 | 6655 | switch (TREE_CODE (inner)) |
8b6a5902 | 6656 | { |
3e4093b6 RS |
6657 | case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR: |
6658 | case PLUS_EXPR: | |
6659 | inner = TREE_OPERAND (inner, 0); | |
6660 | continue; | |
6661 | ||
6662 | case MINUS_EXPR: | |
6663 | /* If the second operand of the MINUS_EXPR has a pointer | |
6664 | type (or is converted from it), this may be valid, so | |
6665 | don't give a warning. */ | |
6666 | { | |
6667 | tree op1 = TREE_OPERAND (inner, 1); | |
8b6a5902 | 6668 | |
3f75a254 | 6669 | while (!POINTER_TYPE_P (TREE_TYPE (op1)) |
3e4093b6 RS |
6670 | && (TREE_CODE (op1) == NOP_EXPR |
6671 | || TREE_CODE (op1) == NON_LVALUE_EXPR | |
6672 | || TREE_CODE (op1) == CONVERT_EXPR)) | |
6673 | op1 = TREE_OPERAND (op1, 0); | |
8b6a5902 | 6674 | |
3e4093b6 RS |
6675 | if (POINTER_TYPE_P (TREE_TYPE (op1))) |
6676 | break; | |
8b6a5902 | 6677 | |
3e4093b6 RS |
6678 | inner = TREE_OPERAND (inner, 0); |
6679 | continue; | |
6680 | } | |
400fbf9f | 6681 | |
3e4093b6 RS |
6682 | case ADDR_EXPR: |
6683 | inner = TREE_OPERAND (inner, 0); | |
c2f4acb7 | 6684 | |
6615c446 | 6685 | while (REFERENCE_CLASS_P (inner) |
9fc3b39a | 6686 | && TREE_CODE (inner) != INDIRECT_REF) |
3e4093b6 | 6687 | inner = TREE_OPERAND (inner, 0); |
8b6a5902 | 6688 | |
a2f1f4c3 | 6689 | if (DECL_P (inner) |
3f75a254 JM |
6690 | && !DECL_EXTERNAL (inner) |
6691 | && !TREE_STATIC (inner) | |
3e4093b6 | 6692 | && DECL_CONTEXT (inner) == current_function_decl) |
d4ee4d25 | 6693 | warning (0, "function returns address of local variable"); |
3e4093b6 | 6694 | break; |
8b6a5902 | 6695 | |
3e4093b6 RS |
6696 | default: |
6697 | break; | |
6698 | } | |
de520661 | 6699 | |
3e4093b6 RS |
6700 | break; |
6701 | } | |
6702 | ||
53fb4de3 | 6703 | retval = build2 (MODIFY_EXPR, TREE_TYPE (res), res, t); |
de520661 | 6704 | } |
8b6a5902 | 6705 | |
506e2710 | 6706 | return add_stmt (build_stmt (RETURN_EXPR, retval)); |
de520661 | 6707 | } |
3e4093b6 RS |
6708 | \f |
6709 | struct c_switch { | |
604f5adf ILT |
6710 | /* The SWITCH_EXPR being built. */ |
6711 | tree switch_expr; | |
a6c0a76c | 6712 | |
89dbed81 | 6713 | /* The original type of the testing expression, i.e. before the |
a6c0a76c SB |
6714 | default conversion is applied. */ |
6715 | tree orig_type; | |
6716 | ||
3e4093b6 RS |
6717 | /* A splay-tree mapping the low element of a case range to the high |
6718 | element, or NULL_TREE if there is no high element. Used to | |
6719 | determine whether or not a new case label duplicates an old case | |
6720 | label. We need a tree, rather than simply a hash table, because | |
6721 | of the GNU case range extension. */ | |
6722 | splay_tree cases; | |
a6c0a76c | 6723 | |
16ef3acc JM |
6724 | /* Number of nested statement expressions within this switch |
6725 | statement; if nonzero, case and default labels may not | |
6726 | appear. */ | |
6727 | unsigned int blocked_stmt_expr; | |
6728 | ||
187230a7 JM |
6729 | /* Scope of outermost declarations of identifiers with variably |
6730 | modified type within this switch statement; if nonzero, case and | |
6731 | default labels may not appear. */ | |
6732 | unsigned int blocked_vm; | |
6733 | ||
3e4093b6 RS |
6734 | /* The next node on the stack. */ |
6735 | struct c_switch *next; | |
6736 | }; | |
400fbf9f | 6737 | |
3e4093b6 RS |
6738 | /* A stack of the currently active switch statements. The innermost |
6739 | switch statement is on the top of the stack. There is no need to | |
6740 | mark the stack for garbage collection because it is only active | |
6741 | during the processing of the body of a function, and we never | |
6742 | collect at that point. */ | |
de520661 | 6743 | |
506e2710 | 6744 | struct c_switch *c_switch_stack; |
de520661 | 6745 | |
3e4093b6 | 6746 | /* Start a C switch statement, testing expression EXP. Return the new |
604f5adf | 6747 | SWITCH_EXPR. */ |
de520661 | 6748 | |
3e4093b6 RS |
6749 | tree |
6750 | c_start_case (tree exp) | |
de520661 | 6751 | { |
3e4093b6 RS |
6752 | enum tree_code code; |
6753 | tree type, orig_type = error_mark_node; | |
6754 | struct c_switch *cs; | |
2f6e4e97 | 6755 | |
3e4093b6 | 6756 | if (exp != error_mark_node) |
de520661 | 6757 | { |
3e4093b6 RS |
6758 | code = TREE_CODE (TREE_TYPE (exp)); |
6759 | orig_type = TREE_TYPE (exp); | |
6760 | ||
3f75a254 | 6761 | if (!INTEGRAL_TYPE_P (orig_type) |
3e4093b6 | 6762 | && code != ERROR_MARK) |
de520661 | 6763 | { |
3e4093b6 RS |
6764 | error ("switch quantity not an integer"); |
6765 | exp = integer_zero_node; | |
02fbae83 | 6766 | orig_type = error_mark_node; |
de520661 | 6767 | } |
3e4093b6 | 6768 | else |
de520661 | 6769 | { |
3e4093b6 | 6770 | type = TYPE_MAIN_VARIANT (TREE_TYPE (exp)); |
8b6a5902 | 6771 | |
3e4093b6 RS |
6772 | if (warn_traditional && !in_system_header |
6773 | && (type == long_integer_type_node | |
6774 | || type == long_unsigned_type_node)) | |
d4ee4d25 | 6775 | warning (0, "%<long%> switch expression not converted to " |
bda67431 | 6776 | "%<int%> in ISO C"); |
8b6a5902 | 6777 | |
3e4093b6 RS |
6778 | exp = default_conversion (exp); |
6779 | type = TREE_TYPE (exp); | |
6780 | } | |
6781 | } | |
6782 | ||
604f5adf | 6783 | /* Add this new SWITCH_EXPR to the stack. */ |
5d038c4c | 6784 | cs = XNEW (struct c_switch); |
604f5adf | 6785 | cs->switch_expr = build3 (SWITCH_EXPR, orig_type, exp, NULL_TREE, NULL_TREE); |
a6c0a76c | 6786 | cs->orig_type = orig_type; |
3e4093b6 | 6787 | cs->cases = splay_tree_new (case_compare, NULL, NULL); |
16ef3acc | 6788 | cs->blocked_stmt_expr = 0; |
187230a7 | 6789 | cs->blocked_vm = 0; |
506e2710 RH |
6790 | cs->next = c_switch_stack; |
6791 | c_switch_stack = cs; | |
3e4093b6 | 6792 | |
604f5adf | 6793 | return add_stmt (cs->switch_expr); |
3e4093b6 RS |
6794 | } |
6795 | ||
6796 | /* Process a case label. */ | |
6797 | ||
6798 | tree | |
6799 | do_case (tree low_value, tree high_value) | |
6800 | { | |
6801 | tree label = NULL_TREE; | |
6802 | ||
187230a7 JM |
6803 | if (c_switch_stack && !c_switch_stack->blocked_stmt_expr |
6804 | && !c_switch_stack->blocked_vm) | |
3e4093b6 | 6805 | { |
506e2710 | 6806 | label = c_add_case_label (c_switch_stack->cases, |
604f5adf | 6807 | SWITCH_COND (c_switch_stack->switch_expr), |
a6c0a76c | 6808 | c_switch_stack->orig_type, |
3e4093b6 RS |
6809 | low_value, high_value); |
6810 | if (label == error_mark_node) | |
6811 | label = NULL_TREE; | |
de520661 | 6812 | } |
16ef3acc JM |
6813 | else if (c_switch_stack && c_switch_stack->blocked_stmt_expr) |
6814 | { | |
6815 | if (low_value) | |
6816 | error ("case label in statement expression not containing " | |
6817 | "enclosing switch statement"); | |
6818 | else | |
6819 | error ("%<default%> label in statement expression not containing " | |
6820 | "enclosing switch statement"); | |
6821 | } | |
187230a7 JM |
6822 | else if (c_switch_stack && c_switch_stack->blocked_vm) |
6823 | { | |
6824 | if (low_value) | |
6825 | error ("case label in scope of identifier with variably modified " | |
6826 | "type not containing enclosing switch statement"); | |
6827 | else | |
6828 | error ("%<default%> label in scope of identifier with variably " | |
6829 | "modified type not containing enclosing switch statement"); | |
6830 | } | |
3e4093b6 RS |
6831 | else if (low_value) |
6832 | error ("case label not within a switch statement"); | |
6833 | else | |
bda67431 | 6834 | error ("%<default%> label not within a switch statement"); |
de520661 | 6835 | |
3e4093b6 RS |
6836 | return label; |
6837 | } | |
de520661 | 6838 | |
3e4093b6 | 6839 | /* Finish the switch statement. */ |
de520661 | 6840 | |
3e4093b6 | 6841 | void |
325c3691 | 6842 | c_finish_case (tree body) |
3e4093b6 | 6843 | { |
506e2710 | 6844 | struct c_switch *cs = c_switch_stack; |
fbc315db | 6845 | location_t switch_location; |
3e4093b6 | 6846 | |
604f5adf | 6847 | SWITCH_BODY (cs->switch_expr) = body; |
325c3691 | 6848 | |
187230a7 JM |
6849 | /* We must not be within a statement expression nested in the switch |
6850 | at this point; we might, however, be within the scope of an | |
6851 | identifier with variably modified type nested in the switch. */ | |
16ef3acc JM |
6852 | gcc_assert (!cs->blocked_stmt_expr); |
6853 | ||
6de9cd9a | 6854 | /* Emit warnings as needed. */ |
fbc315db ILT |
6855 | if (EXPR_HAS_LOCATION (cs->switch_expr)) |
6856 | switch_location = EXPR_LOCATION (cs->switch_expr); | |
6857 | else | |
6858 | switch_location = input_location; | |
6859 | c_do_switch_warnings (cs->cases, switch_location, | |
6860 | TREE_TYPE (cs->switch_expr), | |
6861 | SWITCH_COND (cs->switch_expr)); | |
6de9cd9a | 6862 | |
3e4093b6 | 6863 | /* Pop the stack. */ |
506e2710 | 6864 | c_switch_stack = cs->next; |
3e4093b6 | 6865 | splay_tree_delete (cs->cases); |
5d038c4c | 6866 | XDELETE (cs); |
de520661 | 6867 | } |
325c3691 | 6868 | \f |
506e2710 RH |
6869 | /* Emit an if statement. IF_LOCUS is the location of the 'if'. COND, |
6870 | THEN_BLOCK and ELSE_BLOCK are expressions to be used; ELSE_BLOCK | |
6871 | may be null. NESTED_IF is true if THEN_BLOCK contains another IF | |
6872 | statement, and was not surrounded with parenthesis. */ | |
325c3691 | 6873 | |
9e51cf9d | 6874 | void |
506e2710 RH |
6875 | c_finish_if_stmt (location_t if_locus, tree cond, tree then_block, |
6876 | tree else_block, bool nested_if) | |
325c3691 | 6877 | { |
506e2710 | 6878 | tree stmt; |
325c3691 | 6879 | |
506e2710 RH |
6880 | /* Diagnose an ambiguous else if if-then-else is nested inside if-then. */ |
6881 | if (warn_parentheses && nested_if && else_block == NULL) | |
325c3691 | 6882 | { |
506e2710 | 6883 | tree inner_if = then_block; |
16865eaa | 6884 | |
61ada8ae | 6885 | /* We know from the grammar productions that there is an IF nested |
506e2710 RH |
6886 | within THEN_BLOCK. Due to labels and c99 conditional declarations, |
6887 | it might not be exactly THEN_BLOCK, but should be the last | |
6888 | non-container statement within. */ | |
6889 | while (1) | |
6890 | switch (TREE_CODE (inner_if)) | |
6891 | { | |
6892 | case COND_EXPR: | |
6893 | goto found; | |
6894 | case BIND_EXPR: | |
6895 | inner_if = BIND_EXPR_BODY (inner_if); | |
6896 | break; | |
6897 | case STATEMENT_LIST: | |
6898 | inner_if = expr_last (then_block); | |
6899 | break; | |
6900 | case TRY_FINALLY_EXPR: | |
6901 | case TRY_CATCH_EXPR: | |
6902 | inner_if = TREE_OPERAND (inner_if, 0); | |
6903 | break; | |
6904 | default: | |
366de0ce | 6905 | gcc_unreachable (); |
506e2710 RH |
6906 | } |
6907 | found: | |
16865eaa | 6908 | |
506e2710 | 6909 | if (COND_EXPR_ELSE (inner_if)) |
d4ee4d25 | 6910 | warning (0, "%Hsuggest explicit braces to avoid ambiguous %<else%>", |
506e2710 RH |
6911 | &if_locus); |
6912 | } | |
16865eaa | 6913 | |
506e2710 RH |
6914 | /* Diagnose ";" via the special empty statement node that we create. */ |
6915 | if (extra_warnings) | |
16865eaa | 6916 | { |
506e2710 RH |
6917 | if (TREE_CODE (then_block) == NOP_EXPR && !TREE_TYPE (then_block)) |
6918 | { | |
6919 | if (!else_block) | |
d4ee4d25 | 6920 | warning (0, "%Hempty body in an if-statement", |
506e2710 RH |
6921 | EXPR_LOCUS (then_block)); |
6922 | then_block = alloc_stmt_list (); | |
6923 | } | |
6924 | if (else_block | |
6925 | && TREE_CODE (else_block) == NOP_EXPR | |
6926 | && !TREE_TYPE (else_block)) | |
6927 | { | |
d4ee4d25 | 6928 | warning (0, "%Hempty body in an else-statement", |
506e2710 RH |
6929 | EXPR_LOCUS (else_block)); |
6930 | else_block = alloc_stmt_list (); | |
6931 | } | |
16865eaa | 6932 | } |
325c3691 | 6933 | |
506e2710 | 6934 | stmt = build3 (COND_EXPR, NULL_TREE, cond, then_block, else_block); |
a281759f | 6935 | SET_EXPR_LOCATION (stmt, if_locus); |
506e2710 | 6936 | add_stmt (stmt); |
325c3691 RH |
6937 | } |
6938 | ||
506e2710 RH |
6939 | /* Emit a general-purpose loop construct. START_LOCUS is the location of |
6940 | the beginning of the loop. COND is the loop condition. COND_IS_FIRST | |
6941 | is false for DO loops. INCR is the FOR increment expression. BODY is | |
61ada8ae | 6942 | the statement controlled by the loop. BLAB is the break label. CLAB is |
506e2710 | 6943 | the continue label. Everything is allowed to be NULL. */ |
325c3691 RH |
6944 | |
6945 | void | |
506e2710 RH |
6946 | c_finish_loop (location_t start_locus, tree cond, tree incr, tree body, |
6947 | tree blab, tree clab, bool cond_is_first) | |
325c3691 | 6948 | { |
506e2710 RH |
6949 | tree entry = NULL, exit = NULL, t; |
6950 | ||
28af952a RS |
6951 | /* If the condition is zero don't generate a loop construct. */ |
6952 | if (cond && integer_zerop (cond)) | |
6953 | { | |
6954 | if (cond_is_first) | |
6955 | { | |
6956 | t = build_and_jump (&blab); | |
6957 | SET_EXPR_LOCATION (t, start_locus); | |
6958 | add_stmt (t); | |
6959 | } | |
6960 | } | |
6961 | else | |
506e2710 RH |
6962 | { |
6963 | tree top = build1 (LABEL_EXPR, void_type_node, NULL_TREE); | |
6964 | ||
6965 | /* If we have an exit condition, then we build an IF with gotos either | |
6966 | out of the loop, or to the top of it. If there's no exit condition, | |
6967 | then we just build a jump back to the top. */ | |
6968 | exit = build_and_jump (&LABEL_EXPR_LABEL (top)); | |
6969 | ||
28af952a | 6970 | if (cond && !integer_nonzerop (cond)) |
506e2710 RH |
6971 | { |
6972 | /* Canonicalize the loop condition to the end. This means | |
6973 | generating a branch to the loop condition. Reuse the | |
6974 | continue label, if possible. */ | |
6975 | if (cond_is_first) | |
6976 | { | |
6977 | if (incr || !clab) | |
6978 | { | |
6979 | entry = build1 (LABEL_EXPR, void_type_node, NULL_TREE); | |
6980 | t = build_and_jump (&LABEL_EXPR_LABEL (entry)); | |
6981 | } | |
6982 | else | |
6983 | t = build1 (GOTO_EXPR, void_type_node, clab); | |
a281759f | 6984 | SET_EXPR_LOCATION (t, start_locus); |
506e2710 RH |
6985 | add_stmt (t); |
6986 | } | |
6987 | ||
6988 | t = build_and_jump (&blab); | |
53fb4de3 | 6989 | exit = build3 (COND_EXPR, void_type_node, cond, exit, t); |
506e2710 RH |
6990 | exit = fold (exit); |
6991 | if (cond_is_first) | |
a281759f | 6992 | SET_EXPR_LOCATION (exit, start_locus); |
506e2710 | 6993 | else |
a281759f | 6994 | SET_EXPR_LOCATION (exit, input_location); |
506e2710 RH |
6995 | } |
6996 | ||
6997 | add_stmt (top); | |
6998 | } | |
6999 | ||
7000 | if (body) | |
7001 | add_stmt (body); | |
7002 | if (clab) | |
7003 | add_stmt (build1 (LABEL_EXPR, void_type_node, clab)); | |
7004 | if (incr) | |
7005 | add_stmt (incr); | |
7006 | if (entry) | |
7007 | add_stmt (entry); | |
7008 | if (exit) | |
7009 | add_stmt (exit); | |
7010 | if (blab) | |
7011 | add_stmt (build1 (LABEL_EXPR, void_type_node, blab)); | |
325c3691 | 7012 | } |
325c3691 RH |
7013 | |
7014 | tree | |
506e2710 | 7015 | c_finish_bc_stmt (tree *label_p, bool is_break) |
325c3691 | 7016 | { |
089efaa4 | 7017 | bool skip; |
506e2710 | 7018 | tree label = *label_p; |
325c3691 | 7019 | |
089efaa4 ILT |
7020 | /* In switch statements break is sometimes stylistically used after |
7021 | a return statement. This can lead to spurious warnings about | |
7022 | control reaching the end of a non-void function when it is | |
7023 | inlined. Note that we are calling block_may_fallthru with | |
7024 | language specific tree nodes; this works because | |
7025 | block_may_fallthru returns true when given something it does not | |
7026 | understand. */ | |
7027 | skip = !block_may_fallthru (cur_stmt_list); | |
7028 | ||
506e2710 | 7029 | if (!label) |
089efaa4 ILT |
7030 | { |
7031 | if (!skip) | |
7032 | *label_p = label = create_artificial_label (); | |
7033 | } | |
506e2710 RH |
7034 | else if (TREE_CODE (label) != LABEL_DECL) |
7035 | { | |
7036 | if (is_break) | |
7037 | error ("break statement not within loop or switch"); | |
7038 | else | |
7039 | error ("continue statement not within a loop"); | |
7040 | return NULL_TREE; | |
7041 | } | |
325c3691 | 7042 | |
089efaa4 ILT |
7043 | if (skip) |
7044 | return NULL_TREE; | |
7045 | ||
53fb4de3 | 7046 | return add_stmt (build1 (GOTO_EXPR, void_type_node, label)); |
325c3691 RH |
7047 | } |
7048 | ||
506e2710 | 7049 | /* A helper routine for c_process_expr_stmt and c_finish_stmt_expr. */ |
3a5b9284 RH |
7050 | |
7051 | static void | |
7052 | emit_side_effect_warnings (tree expr) | |
7053 | { | |
e6b5a630 RH |
7054 | if (expr == error_mark_node) |
7055 | ; | |
7056 | else if (!TREE_SIDE_EFFECTS (expr)) | |
3a5b9284 RH |
7057 | { |
7058 | if (!VOID_TYPE_P (TREE_TYPE (expr)) && !TREE_NO_WARNING (expr)) | |
d4ee4d25 | 7059 | warning (0, "%Hstatement with no effect", |
607bdeaa | 7060 | EXPR_HAS_LOCATION (expr) ? EXPR_LOCUS (expr) : &input_location); |
3a5b9284 RH |
7061 | } |
7062 | else if (warn_unused_value) | |
7063 | warn_if_unused_value (expr, input_location); | |
7064 | } | |
7065 | ||
506e2710 RH |
7066 | /* Process an expression as if it were a complete statement. Emit |
7067 | diagnostics, but do not call ADD_STMT. */ | |
3a5b9284 | 7068 | |
506e2710 RH |
7069 | tree |
7070 | c_process_expr_stmt (tree expr) | |
3a5b9284 RH |
7071 | { |
7072 | if (!expr) | |
506e2710 | 7073 | return NULL_TREE; |
3a5b9284 RH |
7074 | |
7075 | /* Do default conversion if safe and possibly important, | |
7076 | in case within ({...}). */ | |
7077 | if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE | |
7078 | && (flag_isoc99 || lvalue_p (expr))) | |
7079 | || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE) | |
7080 | expr = default_conversion (expr); | |
7081 | ||
7082 | if (warn_sequence_point) | |
7083 | verify_sequence_points (expr); | |
7084 | ||
7085 | if (TREE_TYPE (expr) != error_mark_node | |
7086 | && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr)) | |
7087 | && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE) | |
7088 | error ("expression statement has incomplete type"); | |
7089 | ||
7090 | /* If we're not processing a statement expression, warn about unused values. | |
7091 | Warnings for statement expressions will be emitted later, once we figure | |
7092 | out which is the result. */ | |
7093 | if (!STATEMENT_LIST_STMT_EXPR (cur_stmt_list) | |
7094 | && (extra_warnings || warn_unused_value)) | |
7095 | emit_side_effect_warnings (expr); | |
7096 | ||
7097 | /* If the expression is not of a type to which we cannot assign a line | |
7098 | number, wrap the thing in a no-op NOP_EXPR. */ | |
6615c446 | 7099 | if (DECL_P (expr) || CONSTANT_CLASS_P (expr)) |
3a5b9284 RH |
7100 | expr = build1 (NOP_EXPR, TREE_TYPE (expr), expr); |
7101 | ||
506e2710 | 7102 | if (EXPR_P (expr)) |
a281759f | 7103 | SET_EXPR_LOCATION (expr, input_location); |
506e2710 RH |
7104 | |
7105 | return expr; | |
7106 | } | |
7107 | ||
7108 | /* Emit an expression as a statement. */ | |
7109 | ||
7110 | tree | |
7111 | c_finish_expr_stmt (tree expr) | |
7112 | { | |
7113 | if (expr) | |
7114 | return add_stmt (c_process_expr_stmt (expr)); | |
7115 | else | |
7116 | return NULL; | |
3a5b9284 RH |
7117 | } |
7118 | ||
7119 | /* Do the opposite and emit a statement as an expression. To begin, | |
7120 | create a new binding level and return it. */ | |
325c3691 RH |
7121 | |
7122 | tree | |
7123 | c_begin_stmt_expr (void) | |
7124 | { | |
7125 | tree ret; | |
187230a7 | 7126 | struct c_label_context_se *nstack; |
16ef3acc | 7127 | struct c_label_list *glist; |
325c3691 RH |
7128 | |
7129 | /* We must force a BLOCK for this level so that, if it is not expanded | |
7130 | later, there is a way to turn off the entire subtree of blocks that | |
7131 | are contained in it. */ | |
7132 | keep_next_level (); | |
7133 | ret = c_begin_compound_stmt (true); | |
16ef3acc JM |
7134 | if (c_switch_stack) |
7135 | { | |
7136 | c_switch_stack->blocked_stmt_expr++; | |
7137 | gcc_assert (c_switch_stack->blocked_stmt_expr != 0); | |
7138 | } | |
187230a7 | 7139 | for (glist = label_context_stack_se->labels_used; |
16ef3acc JM |
7140 | glist != NULL; |
7141 | glist = glist->next) | |
7142 | { | |
7143 | C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 1; | |
7144 | } | |
187230a7 | 7145 | nstack = XOBNEW (&parser_obstack, struct c_label_context_se); |
16ef3acc JM |
7146 | nstack->labels_def = NULL; |
7147 | nstack->labels_used = NULL; | |
187230a7 JM |
7148 | nstack->next = label_context_stack_se; |
7149 | label_context_stack_se = nstack; | |
325c3691 RH |
7150 | |
7151 | /* Mark the current statement list as belonging to a statement list. */ | |
7152 | STATEMENT_LIST_STMT_EXPR (ret) = 1; | |
7153 | ||
7154 | return ret; | |
7155 | } | |
7156 | ||
7157 | tree | |
7158 | c_finish_stmt_expr (tree body) | |
7159 | { | |
3a5b9284 | 7160 | tree last, type, tmp, val; |
325c3691 | 7161 | tree *last_p; |
16ef3acc | 7162 | struct c_label_list *dlist, *glist, *glist_prev = NULL; |
325c3691 RH |
7163 | |
7164 | body = c_end_compound_stmt (body, true); | |
16ef3acc JM |
7165 | if (c_switch_stack) |
7166 | { | |
7167 | gcc_assert (c_switch_stack->blocked_stmt_expr != 0); | |
7168 | c_switch_stack->blocked_stmt_expr--; | |
7169 | } | |
7170 | /* It is no longer possible to jump to labels defined within this | |
7171 | statement expression. */ | |
187230a7 | 7172 | for (dlist = label_context_stack_se->labels_def; |
16ef3acc JM |
7173 | dlist != NULL; |
7174 | dlist = dlist->next) | |
7175 | { | |
7176 | C_DECL_UNJUMPABLE_STMT_EXPR (dlist->label) = 1; | |
7177 | } | |
7178 | /* It is again possible to define labels with a goto just outside | |
7179 | this statement expression. */ | |
187230a7 | 7180 | for (glist = label_context_stack_se->next->labels_used; |
16ef3acc JM |
7181 | glist != NULL; |
7182 | glist = glist->next) | |
7183 | { | |
7184 | C_DECL_UNDEFINABLE_STMT_EXPR (glist->label) = 0; | |
7185 | glist_prev = glist; | |
7186 | } | |
7187 | if (glist_prev != NULL) | |
187230a7 | 7188 | glist_prev->next = label_context_stack_se->labels_used; |
16ef3acc | 7189 | else |
187230a7 JM |
7190 | label_context_stack_se->next->labels_used |
7191 | = label_context_stack_se->labels_used; | |
7192 | label_context_stack_se = label_context_stack_se->next; | |
325c3691 | 7193 | |
3a5b9284 RH |
7194 | /* Locate the last statement in BODY. See c_end_compound_stmt |
7195 | about always returning a BIND_EXPR. */ | |
7196 | last_p = &BIND_EXPR_BODY (body); | |
7197 | last = BIND_EXPR_BODY (body); | |
7198 | ||
7199 | continue_searching: | |
325c3691 RH |
7200 | if (TREE_CODE (last) == STATEMENT_LIST) |
7201 | { | |
3a5b9284 RH |
7202 | tree_stmt_iterator i; |
7203 | ||
7204 | /* This can happen with degenerate cases like ({ }). No value. */ | |
7205 | if (!TREE_SIDE_EFFECTS (last)) | |
7206 | return body; | |
7207 | ||
7208 | /* If we're supposed to generate side effects warnings, process | |
7209 | all of the statements except the last. */ | |
7210 | if (extra_warnings || warn_unused_value) | |
325c3691 | 7211 | { |
3a5b9284 RH |
7212 | for (i = tsi_start (last); !tsi_one_before_end_p (i); tsi_next (&i)) |
7213 | emit_side_effect_warnings (tsi_stmt (i)); | |
325c3691 RH |
7214 | } |
7215 | else | |
3a5b9284 RH |
7216 | i = tsi_last (last); |
7217 | last_p = tsi_stmt_ptr (i); | |
7218 | last = *last_p; | |
325c3691 RH |
7219 | } |
7220 | ||
3a5b9284 RH |
7221 | /* If the end of the list is exception related, then the list was split |
7222 | by a call to push_cleanup. Continue searching. */ | |
7223 | if (TREE_CODE (last) == TRY_FINALLY_EXPR | |
7224 | || TREE_CODE (last) == TRY_CATCH_EXPR) | |
7225 | { | |
7226 | last_p = &TREE_OPERAND (last, 0); | |
7227 | last = *last_p; | |
7228 | goto continue_searching; | |
7229 | } | |
7230 | ||
7231 | /* In the case that the BIND_EXPR is not necessary, return the | |
7232 | expression out from inside it. */ | |
e6b5a630 RH |
7233 | if (last == error_mark_node |
7234 | || (last == BIND_EXPR_BODY (body) | |
7235 | && BIND_EXPR_VARS (body) == NULL)) | |
3a5b9284 | 7236 | return last; |
325c3691 RH |
7237 | |
7238 | /* Extract the type of said expression. */ | |
7239 | type = TREE_TYPE (last); | |
325c3691 | 7240 | |
3a5b9284 RH |
7241 | /* If we're not returning a value at all, then the BIND_EXPR that |
7242 | we already have is a fine expression to return. */ | |
7243 | if (!type || VOID_TYPE_P (type)) | |
7244 | return body; | |
7245 | ||
7246 | /* Now that we've located the expression containing the value, it seems | |
7247 | silly to make voidify_wrapper_expr repeat the process. Create a | |
7248 | temporary of the appropriate type and stick it in a TARGET_EXPR. */ | |
7249 | tmp = create_tmp_var_raw (type, NULL); | |
7250 | ||
7251 | /* Unwrap a no-op NOP_EXPR as added by c_finish_expr_stmt. This avoids | |
7252 | tree_expr_nonnegative_p giving up immediately. */ | |
7253 | val = last; | |
7254 | if (TREE_CODE (val) == NOP_EXPR | |
7255 | && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0))) | |
7256 | val = TREE_OPERAND (val, 0); | |
7257 | ||
53fb4de3 | 7258 | *last_p = build2 (MODIFY_EXPR, void_type_node, tmp, val); |
3a5b9284 RH |
7259 | SET_EXPR_LOCUS (*last_p, EXPR_LOCUS (last)); |
7260 | ||
53fb4de3 | 7261 | return build4 (TARGET_EXPR, type, tmp, body, NULL_TREE, NULL_TREE); |
325c3691 | 7262 | } |
187230a7 JM |
7263 | |
7264 | /* Begin the scope of an identifier of variably modified type, scope | |
7265 | number SCOPE. Jumping from outside this scope to inside it is not | |
7266 | permitted. */ | |
7267 | ||
7268 | void | |
7269 | c_begin_vm_scope (unsigned int scope) | |
7270 | { | |
7271 | struct c_label_context_vm *nstack; | |
7272 | struct c_label_list *glist; | |
7273 | ||
7274 | gcc_assert (scope > 0); | |
7275 | if (c_switch_stack && !c_switch_stack->blocked_vm) | |
7276 | c_switch_stack->blocked_vm = scope; | |
7277 | for (glist = label_context_stack_vm->labels_used; | |
7278 | glist != NULL; | |
7279 | glist = glist->next) | |
7280 | { | |
7281 | C_DECL_UNDEFINABLE_VM (glist->label) = 1; | |
7282 | } | |
7283 | nstack = XOBNEW (&parser_obstack, struct c_label_context_vm); | |
7284 | nstack->labels_def = NULL; | |
7285 | nstack->labels_used = NULL; | |
7286 | nstack->scope = scope; | |
7287 | nstack->next = label_context_stack_vm; | |
7288 | label_context_stack_vm = nstack; | |
7289 | } | |
7290 | ||
7291 | /* End a scope which may contain identifiers of variably modified | |
7292 | type, scope number SCOPE. */ | |
7293 | ||
7294 | void | |
7295 | c_end_vm_scope (unsigned int scope) | |
7296 | { | |
7297 | if (label_context_stack_vm == NULL) | |
7298 | return; | |
7299 | if (c_switch_stack && c_switch_stack->blocked_vm == scope) | |
7300 | c_switch_stack->blocked_vm = 0; | |
7301 | /* We may have a number of nested scopes of identifiers with | |
7302 | variably modified type, all at this depth. Pop each in turn. */ | |
7303 | while (label_context_stack_vm->scope == scope) | |
7304 | { | |
7305 | struct c_label_list *dlist, *glist, *glist_prev = NULL; | |
7306 | ||
7307 | /* It is no longer possible to jump to labels defined within this | |
7308 | scope. */ | |
7309 | for (dlist = label_context_stack_vm->labels_def; | |
7310 | dlist != NULL; | |
7311 | dlist = dlist->next) | |
7312 | { | |
7313 | C_DECL_UNJUMPABLE_VM (dlist->label) = 1; | |
7314 | } | |
7315 | /* It is again possible to define labels with a goto just outside | |
7316 | this scope. */ | |
7317 | for (glist = label_context_stack_vm->next->labels_used; | |
7318 | glist != NULL; | |
7319 | glist = glist->next) | |
7320 | { | |
7321 | C_DECL_UNDEFINABLE_VM (glist->label) = 0; | |
7322 | glist_prev = glist; | |
7323 | } | |
7324 | if (glist_prev != NULL) | |
7325 | glist_prev->next = label_context_stack_vm->labels_used; | |
7326 | else | |
7327 | label_context_stack_vm->next->labels_used | |
7328 | = label_context_stack_vm->labels_used; | |
7329 | label_context_stack_vm = label_context_stack_vm->next; | |
7330 | } | |
7331 | } | |
325c3691 RH |
7332 | \f |
7333 | /* Begin and end compound statements. This is as simple as pushing | |
7334 | and popping new statement lists from the tree. */ | |
7335 | ||
7336 | tree | |
7337 | c_begin_compound_stmt (bool do_scope) | |
7338 | { | |
7339 | tree stmt = push_stmt_list (); | |
7340 | if (do_scope) | |
4dfa0342 | 7341 | push_scope (); |
325c3691 RH |
7342 | return stmt; |
7343 | } | |
7344 | ||
7345 | tree | |
7346 | c_end_compound_stmt (tree stmt, bool do_scope) | |
7347 | { | |
7348 | tree block = NULL; | |
7349 | ||
7350 | if (do_scope) | |
7351 | { | |
7352 | if (c_dialect_objc ()) | |
7353 | objc_clear_super_receiver (); | |
7354 | block = pop_scope (); | |
7355 | } | |
7356 | ||
7357 | stmt = pop_stmt_list (stmt); | |
7358 | stmt = c_build_bind_expr (block, stmt); | |
7359 | ||
7360 | /* If this compound statement is nested immediately inside a statement | |
7361 | expression, then force a BIND_EXPR to be created. Otherwise we'll | |
7362 | do the wrong thing for ({ { 1; } }) or ({ 1; { } }). In particular, | |
7363 | STATEMENT_LISTs merge, and thus we can lose track of what statement | |
7364 | was really last. */ | |
7365 | if (cur_stmt_list | |
7366 | && STATEMENT_LIST_STMT_EXPR (cur_stmt_list) | |
7367 | && TREE_CODE (stmt) != BIND_EXPR) | |
7368 | { | |
53fb4de3 | 7369 | stmt = build3 (BIND_EXPR, void_type_node, NULL, stmt, NULL); |
325c3691 RH |
7370 | TREE_SIDE_EFFECTS (stmt) = 1; |
7371 | } | |
7372 | ||
7373 | return stmt; | |
7374 | } | |
5a508662 RH |
7375 | |
7376 | /* Queue a cleanup. CLEANUP is an expression/statement to be executed | |
7377 | when the current scope is exited. EH_ONLY is true when this is not | |
7378 | meant to apply to normal control flow transfer. */ | |
7379 | ||
7380 | void | |
e18476eb | 7381 | push_cleanup (tree ARG_UNUSED (decl), tree cleanup, bool eh_only) |
5a508662 | 7382 | { |
3a5b9284 RH |
7383 | enum tree_code code; |
7384 | tree stmt, list; | |
7385 | bool stmt_expr; | |
7386 | ||
7387 | code = eh_only ? TRY_CATCH_EXPR : TRY_FINALLY_EXPR; | |
7388 | stmt = build_stmt (code, NULL, cleanup); | |
5a508662 | 7389 | add_stmt (stmt); |
3a5b9284 RH |
7390 | stmt_expr = STATEMENT_LIST_STMT_EXPR (cur_stmt_list); |
7391 | list = push_stmt_list (); | |
7392 | TREE_OPERAND (stmt, 0) = list; | |
7393 | STATEMENT_LIST_STMT_EXPR (list) = stmt_expr; | |
5a508662 | 7394 | } |
325c3691 | 7395 | \f |
3e4093b6 RS |
7396 | /* Build a binary-operation expression without default conversions. |
7397 | CODE is the kind of expression to build. | |
7398 | This function differs from `build' in several ways: | |
7399 | the data type of the result is computed and recorded in it, | |
7400 | warnings are generated if arg data types are invalid, | |
7401 | special handling for addition and subtraction of pointers is known, | |
7402 | and some optimization is done (operations on narrow ints | |
7403 | are done in the narrower type when that gives the same result). | |
7404 | Constant folding is also done before the result is returned. | |
de520661 | 7405 | |
3e4093b6 RS |
7406 | Note that the operands will never have enumeral types, or function |
7407 | or array types, because either they will have the default conversions | |
7408 | performed or they have both just been converted to some other type in which | |
7409 | the arithmetic is to be done. */ | |
7410 | ||
7411 | tree | |
7412 | build_binary_op (enum tree_code code, tree orig_op0, tree orig_op1, | |
7413 | int convert_p) | |
de520661 | 7414 | { |
3e4093b6 RS |
7415 | tree type0, type1; |
7416 | enum tree_code code0, code1; | |
7417 | tree op0, op1; | |
b62acd60 | 7418 | |
3e4093b6 RS |
7419 | /* Expression code to give to the expression when it is built. |
7420 | Normally this is CODE, which is what the caller asked for, | |
7421 | but in some special cases we change it. */ | |
7422 | enum tree_code resultcode = code; | |
8b6a5902 | 7423 | |
3e4093b6 RS |
7424 | /* Data type in which the computation is to be performed. |
7425 | In the simplest cases this is the common type of the arguments. */ | |
7426 | tree result_type = NULL; | |
7427 | ||
7428 | /* Nonzero means operands have already been type-converted | |
7429 | in whatever way is necessary. | |
7430 | Zero means they need to be converted to RESULT_TYPE. */ | |
7431 | int converted = 0; | |
7432 | ||
7433 | /* Nonzero means create the expression with this type, rather than | |
7434 | RESULT_TYPE. */ | |
7435 | tree build_type = 0; | |
7436 | ||
7437 | /* Nonzero means after finally constructing the expression | |
7438 | convert it to this type. */ | |
7439 | tree final_type = 0; | |
7440 | ||
7441 | /* Nonzero if this is an operation like MIN or MAX which can | |
7442 | safely be computed in short if both args are promoted shorts. | |
7443 | Also implies COMMON. | |
7444 | -1 indicates a bitwise operation; this makes a difference | |
7445 | in the exact conditions for when it is safe to do the operation | |
7446 | in a narrower mode. */ | |
7447 | int shorten = 0; | |
7448 | ||
7449 | /* Nonzero if this is a comparison operation; | |
7450 | if both args are promoted shorts, compare the original shorts. | |
7451 | Also implies COMMON. */ | |
7452 | int short_compare = 0; | |
7453 | ||
7454 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
7455 | original short and then promoted if the operand is a promoted short. */ | |
7456 | int short_shift = 0; | |
7457 | ||
7458 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
7459 | int common = 0; | |
7460 | ||
58393038 ZL |
7461 | /* True means types are compatible as far as ObjC is concerned. */ |
7462 | bool objc_ok; | |
7463 | ||
3e4093b6 | 7464 | if (convert_p) |
790e9490 | 7465 | { |
3e4093b6 RS |
7466 | op0 = default_conversion (orig_op0); |
7467 | op1 = default_conversion (orig_op1); | |
790e9490 | 7468 | } |
3e4093b6 | 7469 | else |
790e9490 | 7470 | { |
3e4093b6 RS |
7471 | op0 = orig_op0; |
7472 | op1 = orig_op1; | |
790e9490 RS |
7473 | } |
7474 | ||
3e4093b6 RS |
7475 | type0 = TREE_TYPE (op0); |
7476 | type1 = TREE_TYPE (op1); | |
91fa3c30 | 7477 | |
3e4093b6 RS |
7478 | /* The expression codes of the data types of the arguments tell us |
7479 | whether the arguments are integers, floating, pointers, etc. */ | |
7480 | code0 = TREE_CODE (type0); | |
7481 | code1 = TREE_CODE (type1); | |
7482 | ||
7483 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ | |
7484 | STRIP_TYPE_NOPS (op0); | |
7485 | STRIP_TYPE_NOPS (op1); | |
7486 | ||
7487 | /* If an error was already reported for one of the arguments, | |
7488 | avoid reporting another error. */ | |
7489 | ||
7490 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
7491 | return error_mark_node; | |
7492 | ||
58393038 ZL |
7493 | objc_ok = objc_compare_types (type0, type1, -3, NULL_TREE); |
7494 | ||
3e4093b6 | 7495 | switch (code) |
de520661 | 7496 | { |
3e4093b6 RS |
7497 | case PLUS_EXPR: |
7498 | /* Handle the pointer + int case. */ | |
7499 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
7500 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
7501 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
7502 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
fe67cf58 | 7503 | else |
3e4093b6 RS |
7504 | common = 1; |
7505 | break; | |
400fbf9f | 7506 | |
3e4093b6 RS |
7507 | case MINUS_EXPR: |
7508 | /* Subtraction of two similar pointers. | |
7509 | We must subtract them as integers, then divide by object size. */ | |
7510 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
58393038 | 7511 | && comp_target_types (type0, type1)) |
3e4093b6 RS |
7512 | return pointer_diff (op0, op1); |
7513 | /* Handle pointer minus int. Just like pointer plus int. */ | |
7514 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
7515 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
7516 | else | |
7517 | common = 1; | |
7518 | break; | |
8b6a5902 | 7519 | |
3e4093b6 RS |
7520 | case MULT_EXPR: |
7521 | common = 1; | |
7522 | break; | |
7523 | ||
7524 | case TRUNC_DIV_EXPR: | |
7525 | case CEIL_DIV_EXPR: | |
7526 | case FLOOR_DIV_EXPR: | |
7527 | case ROUND_DIV_EXPR: | |
7528 | case EXACT_DIV_EXPR: | |
7529 | /* Floating point division by zero is a legitimate way to obtain | |
7530 | infinities and NaNs. */ | |
44c21c7f DD |
7531 | if (skip_evaluation == 0 && integer_zerop (op1)) |
7532 | warning (OPT_Wdiv_by_zero, "division by zero"); | |
3e4093b6 RS |
7533 | |
7534 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE | |
7535 | || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) | |
7536 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
7537 | || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)) | |
400fbf9f | 7538 | { |
3a021db2 PB |
7539 | if (code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) |
7540 | code0 = TREE_CODE (TREE_TYPE (TREE_TYPE (op0))); | |
7541 | if (code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE) | |
7542 | code1 = TREE_CODE (TREE_TYPE (TREE_TYPE (op1))); | |
7543 | ||
3e4093b6 RS |
7544 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) |
7545 | resultcode = RDIV_EXPR; | |
7546 | else | |
7547 | /* Although it would be tempting to shorten always here, that | |
7548 | loses on some targets, since the modulo instruction is | |
7549 | undefined if the quotient can't be represented in the | |
7550 | computation mode. We shorten only if unsigned or if | |
7551 | dividing by something we know != -1. */ | |
8df83eae | 7552 | shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0)) |
3e4093b6 | 7553 | || (TREE_CODE (op1) == INTEGER_CST |
3f75a254 | 7554 | && !integer_all_onesp (op1))); |
3e4093b6 RS |
7555 | common = 1; |
7556 | } | |
7557 | break; | |
de520661 | 7558 | |
3e4093b6 | 7559 | case BIT_AND_EXPR: |
3e4093b6 RS |
7560 | case BIT_IOR_EXPR: |
7561 | case BIT_XOR_EXPR: | |
7562 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
7563 | shorten = -1; | |
7564 | else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE) | |
7565 | common = 1; | |
7566 | break; | |
7567 | ||
7568 | case TRUNC_MOD_EXPR: | |
7569 | case FLOOR_MOD_EXPR: | |
44c21c7f DD |
7570 | if (skip_evaluation == 0 && integer_zerop (op1)) |
7571 | warning (OPT_Wdiv_by_zero, "division by zero"); | |
de520661 | 7572 | |
3e4093b6 RS |
7573 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
7574 | { | |
7575 | /* Although it would be tempting to shorten always here, that loses | |
7576 | on some targets, since the modulo instruction is undefined if the | |
7577 | quotient can't be represented in the computation mode. We shorten | |
7578 | only if unsigned or if dividing by something we know != -1. */ | |
8df83eae | 7579 | shorten = (TYPE_UNSIGNED (TREE_TYPE (orig_op0)) |
3e4093b6 | 7580 | || (TREE_CODE (op1) == INTEGER_CST |
3f75a254 | 7581 | && !integer_all_onesp (op1))); |
3e4093b6 RS |
7582 | common = 1; |
7583 | } | |
7584 | break; | |
de520661 | 7585 | |
3e4093b6 RS |
7586 | case TRUTH_ANDIF_EXPR: |
7587 | case TRUTH_ORIF_EXPR: | |
7588 | case TRUTH_AND_EXPR: | |
7589 | case TRUTH_OR_EXPR: | |
7590 | case TRUTH_XOR_EXPR: | |
7591 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE | |
7592 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) | |
7593 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE | |
7594 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
7595 | { | |
7596 | /* Result of these operations is always an int, | |
7597 | but that does not mean the operands should be | |
7598 | converted to ints! */ | |
7599 | result_type = integer_type_node; | |
85498824 JM |
7600 | op0 = c_common_truthvalue_conversion (op0); |
7601 | op1 = c_common_truthvalue_conversion (op1); | |
3e4093b6 RS |
7602 | converted = 1; |
7603 | } | |
7604 | break; | |
eba80994 | 7605 | |
3e4093b6 RS |
7606 | /* Shift operations: result has same type as first operand; |
7607 | always convert second operand to int. | |
7608 | Also set SHORT_SHIFT if shifting rightward. */ | |
de520661 | 7609 | |
3e4093b6 RS |
7610 | case RSHIFT_EXPR: |
7611 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
7612 | { | |
7613 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) | |
b62acd60 | 7614 | { |
3e4093b6 | 7615 | if (tree_int_cst_sgn (op1) < 0) |
d4ee4d25 | 7616 | warning (0, "right shift count is negative"); |
3e4093b6 | 7617 | else |
bbb818c6 | 7618 | { |
3f75a254 | 7619 | if (!integer_zerop (op1)) |
3e4093b6 RS |
7620 | short_shift = 1; |
7621 | ||
7622 | if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) | |
d4ee4d25 | 7623 | warning (0, "right shift count >= width of type"); |
bbb818c6 | 7624 | } |
b62acd60 | 7625 | } |
de520661 | 7626 | |
3e4093b6 RS |
7627 | /* Use the type of the value to be shifted. */ |
7628 | result_type = type0; | |
7629 | /* Convert the shift-count to an integer, regardless of size | |
7630 | of value being shifted. */ | |
7631 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
7632 | op1 = convert (integer_type_node, op1); | |
7633 | /* Avoid converting op1 to result_type later. */ | |
7634 | converted = 1; | |
400fbf9f | 7635 | } |
3e4093b6 | 7636 | break; |
253b6b82 | 7637 | |
3e4093b6 RS |
7638 | case LSHIFT_EXPR: |
7639 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
7640 | { | |
7641 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) | |
de520661 | 7642 | { |
3e4093b6 | 7643 | if (tree_int_cst_sgn (op1) < 0) |
d4ee4d25 | 7644 | warning (0, "left shift count is negative"); |
de520661 | 7645 | |
3e4093b6 | 7646 | else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) |
d4ee4d25 | 7647 | warning (0, "left shift count >= width of type"); |
94ba5069 | 7648 | } |
de520661 | 7649 | |
3e4093b6 RS |
7650 | /* Use the type of the value to be shifted. */ |
7651 | result_type = type0; | |
7652 | /* Convert the shift-count to an integer, regardless of size | |
7653 | of value being shifted. */ | |
7654 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
7655 | op1 = convert (integer_type_node, op1); | |
7656 | /* Avoid converting op1 to result_type later. */ | |
7657 | converted = 1; | |
400fbf9f | 7658 | } |
3e4093b6 | 7659 | break; |
de520661 | 7660 | |
3e4093b6 RS |
7661 | case EQ_EXPR: |
7662 | case NE_EXPR: | |
44c21c7f DD |
7663 | if (code0 == REAL_TYPE || code1 == REAL_TYPE) |
7664 | warning (OPT_Wfloat_equal, | |
7665 | "comparing floating point with == or != is unsafe"); | |
3e4093b6 RS |
7666 | /* Result of comparison is always int, |
7667 | but don't convert the args to int! */ | |
7668 | build_type = integer_type_node; | |
7669 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE | |
eabe2b29 | 7670 | || code0 == COMPLEX_TYPE) |
3e4093b6 | 7671 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
eabe2b29 | 7672 | || code1 == COMPLEX_TYPE)) |
3e4093b6 RS |
7673 | short_compare = 1; |
7674 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
7675 | { | |
7676 | tree tt0 = TREE_TYPE (type0); | |
7677 | tree tt1 = TREE_TYPE (type1); | |
7678 | /* Anything compares with void *. void * compares with anything. | |
7679 | Otherwise, the targets must be compatible | |
7680 | and both must be object or both incomplete. */ | |
58393038 | 7681 | if (comp_target_types (type0, type1)) |
10bc1b1b | 7682 | result_type = common_pointer_type (type0, type1); |
3e4093b6 | 7683 | else if (VOID_TYPE_P (tt0)) |
ee2990e7 | 7684 | { |
3e4093b6 RS |
7685 | /* op0 != orig_op0 detects the case of something |
7686 | whose value is 0 but which isn't a valid null ptr const. */ | |
7687 | if (pedantic && (!integer_zerop (op0) || op0 != orig_op0) | |
7688 | && TREE_CODE (tt1) == FUNCTION_TYPE) | |
bda67431 JM |
7689 | pedwarn ("ISO C forbids comparison of %<void *%>" |
7690 | " with function pointer"); | |
ee2990e7 | 7691 | } |
3e4093b6 | 7692 | else if (VOID_TYPE_P (tt1)) |
e6834654 | 7693 | { |
3e4093b6 RS |
7694 | if (pedantic && (!integer_zerop (op1) || op1 != orig_op1) |
7695 | && TREE_CODE (tt0) == FUNCTION_TYPE) | |
bda67431 JM |
7696 | pedwarn ("ISO C forbids comparison of %<void *%>" |
7697 | " with function pointer"); | |
e6834654 | 7698 | } |
3e4093b6 | 7699 | else |
58393038 ZL |
7700 | /* Avoid warning about the volatile ObjC EH puts on decls. */ |
7701 | if (!objc_ok) | |
7702 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
e6834654 | 7703 | |
3e4093b6 RS |
7704 | if (result_type == NULL_TREE) |
7705 | result_type = ptr_type_node; | |
e6834654 | 7706 | } |
3e4093b6 RS |
7707 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST |
7708 | && integer_zerop (op1)) | |
7709 | result_type = type0; | |
7710 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
7711 | && integer_zerop (op0)) | |
7712 | result_type = type1; | |
7713 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
de520661 | 7714 | { |
3e4093b6 RS |
7715 | result_type = type0; |
7716 | pedwarn ("comparison between pointer and integer"); | |
de520661 | 7717 | } |
3e4093b6 | 7718 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) |
8b6a5902 | 7719 | { |
3e4093b6 RS |
7720 | result_type = type1; |
7721 | pedwarn ("comparison between pointer and integer"); | |
8b6a5902 | 7722 | } |
3e4093b6 | 7723 | break; |
8b6a5902 | 7724 | |
3e4093b6 RS |
7725 | case LE_EXPR: |
7726 | case GE_EXPR: | |
7727 | case LT_EXPR: | |
7728 | case GT_EXPR: | |
7729 | build_type = integer_type_node; | |
7730 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
7731 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
7732 | short_compare = 1; | |
7733 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
7734 | { | |
58393038 | 7735 | if (comp_target_types (type0, type1)) |
3e4093b6 | 7736 | { |
10bc1b1b | 7737 | result_type = common_pointer_type (type0, type1); |
3e4093b6 RS |
7738 | if (!COMPLETE_TYPE_P (TREE_TYPE (type0)) |
7739 | != !COMPLETE_TYPE_P (TREE_TYPE (type1))) | |
7740 | pedwarn ("comparison of complete and incomplete pointers"); | |
7741 | else if (pedantic | |
7742 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
7743 | pedwarn ("ISO C forbids ordered comparisons of pointers to functions"); | |
7744 | } | |
7745 | else | |
7746 | { | |
7747 | result_type = ptr_type_node; | |
7748 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
7749 | } | |
7750 | } | |
7751 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
7752 | && integer_zerop (op1)) | |
7753 | { | |
7754 | result_type = type0; | |
7755 | if (pedantic || extra_warnings) | |
7756 | pedwarn ("ordered comparison of pointer with integer zero"); | |
7757 | } | |
7758 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
7759 | && integer_zerop (op0)) | |
7760 | { | |
7761 | result_type = type1; | |
7762 | if (pedantic) | |
7763 | pedwarn ("ordered comparison of pointer with integer zero"); | |
7764 | } | |
7765 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
7766 | { | |
7767 | result_type = type0; | |
7768 | pedwarn ("comparison between pointer and integer"); | |
7769 | } | |
7770 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
7771 | { | |
7772 | result_type = type1; | |
7773 | pedwarn ("comparison between pointer and integer"); | |
7774 | } | |
7775 | break; | |
64094f6a | 7776 | |
3e4093b6 | 7777 | default: |
37b2f290 | 7778 | gcc_unreachable (); |
c9fe6f9f | 7779 | } |
8f17b5c5 | 7780 | |
e57e265b PB |
7781 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) |
7782 | return error_mark_node; | |
7783 | ||
3e4093b6 RS |
7784 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE |
7785 | || code0 == VECTOR_TYPE) | |
7786 | && | |
7787 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE | |
7788 | || code1 == VECTOR_TYPE)) | |
400fbf9f | 7789 | { |
3e4093b6 | 7790 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
39b726dd | 7791 | |
3e4093b6 | 7792 | if (shorten || common || short_compare) |
ccf7f880 | 7793 | result_type = c_common_type (type0, type1); |
400fbf9f | 7794 | |
3e4093b6 RS |
7795 | /* For certain operations (which identify themselves by shorten != 0) |
7796 | if both args were extended from the same smaller type, | |
7797 | do the arithmetic in that type and then extend. | |
400fbf9f | 7798 | |
3e4093b6 RS |
7799 | shorten !=0 and !=1 indicates a bitwise operation. |
7800 | For them, this optimization is safe only if | |
7801 | both args are zero-extended or both are sign-extended. | |
7802 | Otherwise, we might change the result. | |
7803 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
7804 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
400fbf9f | 7805 | |
3e4093b6 RS |
7806 | if (shorten && none_complex) |
7807 | { | |
7808 | int unsigned0, unsigned1; | |
7809 | tree arg0 = get_narrower (op0, &unsigned0); | |
7810 | tree arg1 = get_narrower (op1, &unsigned1); | |
7811 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
8df83eae | 7812 | int uns = TYPE_UNSIGNED (result_type); |
3e4093b6 | 7813 | tree type; |
400fbf9f | 7814 | |
3e4093b6 | 7815 | final_type = result_type; |
70768eda | 7816 | |
3e4093b6 RS |
7817 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
7818 | but it *requires* conversion to FINAL_TYPE. */ | |
70768eda | 7819 | |
3e4093b6 RS |
7820 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
7821 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
7822 | && TREE_TYPE (op0) != final_type) | |
8df83eae | 7823 | unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
3e4093b6 RS |
7824 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
7825 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
7826 | && TREE_TYPE (op1) != final_type) | |
8df83eae | 7827 | unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
88a3dbc1 | 7828 | |
3e4093b6 | 7829 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ |
abe80e6d | 7830 | |
3e4093b6 RS |
7831 | /* For bitwise operations, signedness of nominal type |
7832 | does not matter. Consider only how operands were extended. */ | |
7833 | if (shorten == -1) | |
7834 | uns = unsigned0; | |
abe80e6d | 7835 | |
3e4093b6 RS |
7836 | /* Note that in all three cases below we refrain from optimizing |
7837 | an unsigned operation on sign-extended args. | |
7838 | That would not be valid. */ | |
abe80e6d | 7839 | |
3e4093b6 RS |
7840 | /* Both args variable: if both extended in same way |
7841 | from same width, do it in that width. | |
7842 | Do it unsigned if args were zero-extended. */ | |
7843 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
7844 | < TYPE_PRECISION (result_type)) | |
7845 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
7846 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
7847 | && unsigned0 == unsigned1 | |
7848 | && (unsigned0 || !uns)) | |
7849 | result_type | |
7850 | = c_common_signed_or_unsigned_type | |
ccf7f880 | 7851 | (unsigned0, c_common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); |
3e4093b6 RS |
7852 | else if (TREE_CODE (arg0) == INTEGER_CST |
7853 | && (unsigned1 || !uns) | |
7854 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
7855 | < TYPE_PRECISION (result_type)) | |
7856 | && (type | |
7857 | = c_common_signed_or_unsigned_type (unsigned1, | |
7858 | TREE_TYPE (arg1)), | |
7859 | int_fits_type_p (arg0, type))) | |
7860 | result_type = type; | |
7861 | else if (TREE_CODE (arg1) == INTEGER_CST | |
7862 | && (unsigned0 || !uns) | |
7863 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
7864 | < TYPE_PRECISION (result_type)) | |
7865 | && (type | |
7866 | = c_common_signed_or_unsigned_type (unsigned0, | |
7867 | TREE_TYPE (arg0)), | |
7868 | int_fits_type_p (arg1, type))) | |
7869 | result_type = type; | |
7870 | } | |
88a3dbc1 | 7871 | |
3e4093b6 | 7872 | /* Shifts can be shortened if shifting right. */ |
2f6e4e97 | 7873 | |
3e4093b6 RS |
7874 | if (short_shift) |
7875 | { | |
7876 | int unsigned_arg; | |
7877 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
88a3dbc1 | 7878 | |
3e4093b6 | 7879 | final_type = result_type; |
abe80e6d | 7880 | |
3e4093b6 | 7881 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) |
8df83eae | 7882 | unsigned_arg = TYPE_UNSIGNED (TREE_TYPE (op0)); |
e9a25f70 | 7883 | |
3e4093b6 RS |
7884 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) |
7885 | /* We can shorten only if the shift count is less than the | |
7886 | number of bits in the smaller type size. */ | |
7887 | && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0 | |
7888 | /* We cannot drop an unsigned shift after sign-extension. */ | |
8df83eae | 7889 | && (!TYPE_UNSIGNED (final_type) || unsigned_arg)) |
3e4093b6 RS |
7890 | { |
7891 | /* Do an unsigned shift if the operand was zero-extended. */ | |
7892 | result_type | |
7893 | = c_common_signed_or_unsigned_type (unsigned_arg, | |
7894 | TREE_TYPE (arg0)); | |
7895 | /* Convert value-to-be-shifted to that type. */ | |
7896 | if (TREE_TYPE (op0) != result_type) | |
7897 | op0 = convert (result_type, op0); | |
7898 | converted = 1; | |
abe80e6d | 7899 | } |
88a3dbc1 RK |
7900 | } |
7901 | ||
3e4093b6 RS |
7902 | /* Comparison operations are shortened too but differently. |
7903 | They identify themselves by setting short_compare = 1. */ | |
56cb9733 | 7904 | |
3e4093b6 RS |
7905 | if (short_compare) |
7906 | { | |
7907 | /* Don't write &op0, etc., because that would prevent op0 | |
7908 | from being kept in a register. | |
7909 | Instead, make copies of the our local variables and | |
7910 | pass the copies by reference, then copy them back afterward. */ | |
7911 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
7912 | enum tree_code xresultcode = resultcode; | |
7913 | tree val | |
7914 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
8f17b5c5 | 7915 | |
3e4093b6 RS |
7916 | if (val != 0) |
7917 | return val; | |
8f17b5c5 | 7918 | |
3e4093b6 RS |
7919 | op0 = xop0, op1 = xop1; |
7920 | converted = 1; | |
7921 | resultcode = xresultcode; | |
8f17b5c5 | 7922 | |
3e4093b6 RS |
7923 | if (warn_sign_compare && skip_evaluation == 0) |
7924 | { | |
3f75a254 JM |
7925 | int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0)); |
7926 | int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3e4093b6 RS |
7927 | int unsignedp0, unsignedp1; |
7928 | tree primop0 = get_narrower (op0, &unsignedp0); | |
7929 | tree primop1 = get_narrower (op1, &unsignedp1); | |
400fbf9f | 7930 | |
3e4093b6 RS |
7931 | xop0 = orig_op0; |
7932 | xop1 = orig_op1; | |
7933 | STRIP_TYPE_NOPS (xop0); | |
7934 | STRIP_TYPE_NOPS (xop1); | |
e89a9554 | 7935 | |
3e4093b6 RS |
7936 | /* Give warnings for comparisons between signed and unsigned |
7937 | quantities that may fail. | |
e89a9554 | 7938 | |
3e4093b6 RS |
7939 | Do the checking based on the original operand trees, so that |
7940 | casts will be considered, but default promotions won't be. | |
400fbf9f | 7941 | |
3e4093b6 RS |
7942 | Do not warn if the comparison is being done in a signed type, |
7943 | since the signed type will only be chosen if it can represent | |
7944 | all the values of the unsigned type. */ | |
3f75a254 | 7945 | if (!TYPE_UNSIGNED (result_type)) |
3e4093b6 RS |
7946 | /* OK */; |
7947 | /* Do not warn if both operands are the same signedness. */ | |
7948 | else if (op0_signed == op1_signed) | |
7949 | /* OK */; | |
7950 | else | |
7951 | { | |
7952 | tree sop, uop; | |
8f17b5c5 | 7953 | |
3e4093b6 RS |
7954 | if (op0_signed) |
7955 | sop = xop0, uop = xop1; | |
7956 | else | |
7957 | sop = xop1, uop = xop0; | |
8f17b5c5 | 7958 | |
3e4093b6 RS |
7959 | /* Do not warn if the signed quantity is an |
7960 | unsuffixed integer literal (or some static | |
7961 | constant expression involving such literals or a | |
7962 | conditional expression involving such literals) | |
7963 | and it is non-negative. */ | |
3a5b9284 | 7964 | if (tree_expr_nonnegative_p (sop)) |
3e4093b6 RS |
7965 | /* OK */; |
7966 | /* Do not warn if the comparison is an equality operation, | |
7967 | the unsigned quantity is an integral constant, and it | |
7968 | would fit in the result if the result were signed. */ | |
7969 | else if (TREE_CODE (uop) == INTEGER_CST | |
7970 | && (resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
7971 | && int_fits_type_p | |
7972 | (uop, c_common_signed_type (result_type))) | |
7973 | /* OK */; | |
7974 | /* Do not warn if the unsigned quantity is an enumeration | |
7975 | constant and its maximum value would fit in the result | |
7976 | if the result were signed. */ | |
7977 | else if (TREE_CODE (uop) == INTEGER_CST | |
7978 | && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE | |
7979 | && int_fits_type_p | |
3f75a254 | 7980 | (TYPE_MAX_VALUE (TREE_TYPE (uop)), |
3e4093b6 RS |
7981 | c_common_signed_type (result_type))) |
7982 | /* OK */; | |
7983 | else | |
d4ee4d25 | 7984 | warning (0, "comparison between signed and unsigned"); |
3e4093b6 | 7985 | } |
8f17b5c5 | 7986 | |
3e4093b6 RS |
7987 | /* Warn if two unsigned values are being compared in a size |
7988 | larger than their original size, and one (and only one) is the | |
7989 | result of a `~' operator. This comparison will always fail. | |
8f17b5c5 | 7990 | |
3e4093b6 RS |
7991 | Also warn if one operand is a constant, and the constant |
7992 | does not have all bits set that are set in the ~ operand | |
7993 | when it is extended. */ | |
8f17b5c5 | 7994 | |
3e4093b6 RS |
7995 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) |
7996 | != (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
7997 | { | |
7998 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
7999 | primop0 = get_narrower (TREE_OPERAND (primop0, 0), | |
8000 | &unsignedp0); | |
8001 | else | |
8002 | primop1 = get_narrower (TREE_OPERAND (primop1, 0), | |
8003 | &unsignedp1); | |
64094f6a | 8004 | |
3e4093b6 RS |
8005 | if (host_integerp (primop0, 0) || host_integerp (primop1, 0)) |
8006 | { | |
8007 | tree primop; | |
8008 | HOST_WIDE_INT constant, mask; | |
8009 | int unsignedp, bits; | |
2ad1815d | 8010 | |
3e4093b6 RS |
8011 | if (host_integerp (primop0, 0)) |
8012 | { | |
8013 | primop = primop1; | |
8014 | unsignedp = unsignedp1; | |
8015 | constant = tree_low_cst (primop0, 0); | |
8016 | } | |
8017 | else | |
8018 | { | |
8019 | primop = primop0; | |
8020 | unsignedp = unsignedp0; | |
8021 | constant = tree_low_cst (primop1, 0); | |
8022 | } | |
8023 | ||
8024 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
8025 | if (bits < TYPE_PRECISION (result_type) | |
8026 | && bits < HOST_BITS_PER_WIDE_INT && unsignedp) | |
8027 | { | |
3f75a254 | 8028 | mask = (~(HOST_WIDE_INT) 0) << bits; |
3e4093b6 | 8029 | if ((mask & constant) != mask) |
d4ee4d25 | 8030 | warning (0, "comparison of promoted ~unsigned with constant"); |
3e4093b6 RS |
8031 | } |
8032 | } | |
8033 | else if (unsignedp0 && unsignedp1 | |
8034 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
8035 | < TYPE_PRECISION (result_type)) | |
8036 | && (TYPE_PRECISION (TREE_TYPE (primop1)) | |
8037 | < TYPE_PRECISION (result_type))) | |
d4ee4d25 | 8038 | warning (0, "comparison of promoted ~unsigned with unsigned"); |
3e4093b6 RS |
8039 | } |
8040 | } | |
2ad1815d | 8041 | } |
64094f6a | 8042 | } |
64094f6a | 8043 | |
3e4093b6 RS |
8044 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. |
8045 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
8046 | Then the expression will be built. | |
8047 | It will be given type FINAL_TYPE if that is nonzero; | |
8048 | otherwise, it will be given type RESULT_TYPE. */ | |
400fbf9f | 8049 | |
3e4093b6 RS |
8050 | if (!result_type) |
8051 | { | |
8052 | binary_op_error (code); | |
8053 | return error_mark_node; | |
8054 | } | |
400fbf9f | 8055 | |
3f75a254 | 8056 | if (!converted) |
3e4093b6 RS |
8057 | { |
8058 | if (TREE_TYPE (op0) != result_type) | |
8059 | op0 = convert (result_type, op0); | |
8060 | if (TREE_TYPE (op1) != result_type) | |
8061 | op1 = convert (result_type, op1); | |
d97c6333 JW |
8062 | |
8063 | /* This can happen if one operand has a vector type, and the other | |
8064 | has a different type. */ | |
8065 | if (TREE_CODE (op0) == ERROR_MARK || TREE_CODE (op1) == ERROR_MARK) | |
8066 | return error_mark_node; | |
3e4093b6 | 8067 | } |
400fbf9f | 8068 | |
3e4093b6 RS |
8069 | if (build_type == NULL_TREE) |
8070 | build_type = result_type; | |
400fbf9f | 8071 | |
3e4093b6 | 8072 | { |
53fb4de3 | 8073 | tree result = build2 (resultcode, build_type, op0, op1); |
3e4093b6 RS |
8074 | |
8075 | /* Treat expressions in initializers specially as they can't trap. */ | |
bf730f15 RS |
8076 | result = require_constant_value ? fold_initializer (result) |
8077 | : fold (result); | |
6de9cd9a | 8078 | |
3e4093b6 | 8079 | if (final_type != 0) |
6de9cd9a DN |
8080 | result = convert (final_type, result); |
8081 | return result; | |
3e4093b6 | 8082 | } |
400fbf9f | 8083 | } |
85498824 JM |
8084 | |
8085 | ||
8086 | /* Convert EXPR to be a truth-value, validating its type for this | |
8087 | purpose. Passes EXPR to default_function_array_conversion. */ | |
8088 | ||
8089 | tree | |
8090 | c_objc_common_truthvalue_conversion (tree expr) | |
8091 | { | |
8092 | expr = default_function_array_conversion (expr); | |
8093 | switch (TREE_CODE (TREE_TYPE (expr))) | |
8094 | { | |
8095 | case ARRAY_TYPE: | |
8096 | error ("used array that cannot be converted to pointer where scalar is required"); | |
8097 | return error_mark_node; | |
8098 | ||
8099 | case RECORD_TYPE: | |
8100 | error ("used struct type value where scalar is required"); | |
8101 | return error_mark_node; | |
8102 | ||
8103 | case UNION_TYPE: | |
8104 | error ("used union type value where scalar is required"); | |
8105 | return error_mark_node; | |
8106 | ||
8107 | default: | |
8108 | break; | |
8109 | } | |
8110 | ||
8111 | /* ??? Should we also give an error for void and vectors rather than | |
8112 | leaving those to give errors later? */ | |
8113 | return c_common_truthvalue_conversion (expr); | |
8114 | } |