]>
Commit | Line | Data |
---|---|---|
400fbf9f | 1 | /* Build expressions with type checking for C compiler. |
06ceef4e | 2 | Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
e6ecc89b | 3 | 1998, 1999, 2000, 2001, 2002 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, | |
26 | and some optimization. | |
27 | ||
28 | There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, | |
29 | and to process initializations in declarations (since they work | |
30 | like a strange sort of assignment). */ | |
31 | ||
32 | #include "config.h" | |
670ee920 | 33 | #include "system.h" |
742b62e7 | 34 | #include "rtl.h" |
400fbf9f JW |
35 | #include "tree.h" |
36 | #include "c-tree.h" | |
6baf1cc8 | 37 | #include "tm_p.h" |
400fbf9f | 38 | #include "flags.h" |
e14417fa | 39 | #include "output.h" |
234042f4 | 40 | #include "expr.h" |
5f6da302 | 41 | #include "toplev.h" |
ab87f8c8 | 42 | #include "intl.h" |
4dd7201e | 43 | #include "ggc.h" |
672a6f42 | 44 | #include "target.h" |
400fbf9f | 45 | |
b71c7f8a | 46 | /* Nonzero if we've already printed a "missing braces around initializer" |
103b7b17 | 47 | message within this initializer. */ |
b71c7f8a | 48 | static int missing_braces_mentioned; |
103b7b17 | 49 | |
7e585d16 ZW |
50 | /* 1 if we explained undeclared var errors. */ |
51 | static int undeclared_variable_notice; | |
52 | ||
6e090c76 KG |
53 | static tree qualify_type PARAMS ((tree, tree)); |
54 | static int comp_target_types PARAMS ((tree, tree)); | |
55 | static int function_types_compatible_p PARAMS ((tree, tree)); | |
56 | static int type_lists_compatible_p PARAMS ((tree, tree)); | |
2f74f7e9 | 57 | static tree decl_constant_value_for_broken_optimization PARAMS ((tree)); |
207bf485 | 58 | static tree default_function_array_conversion PARAMS ((tree)); |
e9b2c823 | 59 | static tree lookup_field PARAMS ((tree, tree)); |
6e090c76 | 60 | static tree convert_arguments PARAMS ((tree, tree, tree, tree)); |
6e090c76 | 61 | static tree pointer_diff PARAMS ((tree, tree)); |
207bf485 | 62 | static tree unary_complex_lvalue PARAMS ((enum tree_code, tree, int)); |
6e090c76 KG |
63 | static void pedantic_lvalue_warning PARAMS ((enum tree_code)); |
64 | static tree internal_build_compound_expr PARAMS ((tree, int)); | |
65 | static tree convert_for_assignment PARAMS ((tree, tree, const char *, | |
66 | tree, tree, int)); | |
67 | static void warn_for_assignment PARAMS ((const char *, const char *, | |
68 | tree, int)); | |
69 | static tree valid_compound_expr_initializer PARAMS ((tree, tree)); | |
70 | static void push_string PARAMS ((const char *)); | |
71 | static void push_member_name PARAMS ((tree)); | |
72 | static void push_array_bounds PARAMS ((int)); | |
73 | static int spelling_length PARAMS ((void)); | |
74 | static char *print_spelling PARAMS ((char *)); | |
75 | static void warning_init PARAMS ((const char *)); | |
273cf2e4 | 76 | static tree digest_init PARAMS ((tree, tree, int)); |
6e090c76 KG |
77 | static void output_init_element PARAMS ((tree, tree, tree, int)); |
78 | static void output_pending_init_elements PARAMS ((int)); | |
8b6a5902 JJ |
79 | static int set_designator PARAMS ((int)); |
80 | static void push_range_stack PARAMS ((tree)); | |
6e090c76 | 81 | static void add_pending_init PARAMS ((tree, tree)); |
8b6a5902 JJ |
82 | static void set_nonincremental_init PARAMS ((void)); |
83 | static void set_nonincremental_init_from_string PARAMS ((tree)); | |
84 | static tree find_init_member PARAMS ((tree)); | |
400fbf9f JW |
85 | \f |
86 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
87 | does not have an incomplete type. (That includes void types.) */ | |
88 | ||
89 | tree | |
90 | require_complete_type (value) | |
91 | tree value; | |
92 | { | |
93 | tree type = TREE_TYPE (value); | |
94 | ||
c3d5c3fa | 95 | if (value == error_mark_node || type == error_mark_node) |
ea0f786b CB |
96 | return error_mark_node; |
97 | ||
400fbf9f | 98 | /* First, detect a valid value with a complete type. */ |
d0f062fb | 99 | if (COMPLETE_TYPE_P (type)) |
400fbf9f JW |
100 | return value; |
101 | ||
7a228918 | 102 | c_incomplete_type_error (value, type); |
400fbf9f JW |
103 | return error_mark_node; |
104 | } | |
105 | ||
106 | /* Print an error message for invalid use of an incomplete type. | |
107 | VALUE is the expression that was used (or 0 if that isn't known) | |
108 | and TYPE is the type that was invalid. */ | |
109 | ||
110 | void | |
7a228918 | 111 | c_incomplete_type_error (value, type) |
400fbf9f JW |
112 | tree value; |
113 | tree type; | |
114 | { | |
5d5993dd | 115 | const char *type_code_string; |
400fbf9f JW |
116 | |
117 | /* Avoid duplicate error message. */ | |
118 | if (TREE_CODE (type) == ERROR_MARK) | |
119 | return; | |
120 | ||
121 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
122 | || TREE_CODE (value) == PARM_DECL)) | |
123 | error ("`%s' has an incomplete type", | |
124 | IDENTIFIER_POINTER (DECL_NAME (value))); | |
125 | else | |
126 | { | |
127 | retry: | |
128 | /* We must print an error message. Be clever about what it says. */ | |
129 | ||
130 | switch (TREE_CODE (type)) | |
131 | { | |
132 | case RECORD_TYPE: | |
ab87f8c8 | 133 | type_code_string = "struct"; |
400fbf9f JW |
134 | break; |
135 | ||
136 | case UNION_TYPE: | |
ab87f8c8 | 137 | type_code_string = "union"; |
400fbf9f JW |
138 | break; |
139 | ||
140 | case ENUMERAL_TYPE: | |
ab87f8c8 | 141 | type_code_string = "enum"; |
400fbf9f JW |
142 | break; |
143 | ||
144 | case VOID_TYPE: | |
145 | error ("invalid use of void expression"); | |
146 | return; | |
147 | ||
148 | case ARRAY_TYPE: | |
149 | if (TYPE_DOMAIN (type)) | |
150 | { | |
fba78abb RH |
151 | if (TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL) |
152 | { | |
153 | error ("invalid use of flexible array member"); | |
154 | return; | |
155 | } | |
400fbf9f JW |
156 | type = TREE_TYPE (type); |
157 | goto retry; | |
158 | } | |
159 | error ("invalid use of array with unspecified bounds"); | |
160 | return; | |
161 | ||
162 | default: | |
163 | abort (); | |
164 | } | |
165 | ||
166 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
ab87f8c8 JL |
167 | error ("invalid use of undefined type `%s %s'", |
168 | type_code_string, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
400fbf9f JW |
169 | else |
170 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
171 | error ("invalid use of incomplete typedef `%s'", | |
172 | IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
173 | } | |
174 | } | |
175 | ||
ab393bf1 NB |
176 | /* Given a type, apply default promotions wrt unnamed function |
177 | arguments and return the new type. */ | |
178 | ||
179 | tree | |
180 | c_type_promotes_to (type) | |
181 | tree type; | |
182 | { | |
183 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
184 | return double_type_node; | |
185 | ||
186 | if (c_promoting_integer_type_p (type)) | |
187 | { | |
188 | /* Preserve unsignedness if not really getting any wider. */ | |
189 | if (TREE_UNSIGNED (type) | |
190 | && (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) | |
191 | return unsigned_type_node; | |
192 | return integer_type_node; | |
193 | } | |
194 | ||
195 | return type; | |
196 | } | |
197 | ||
400fbf9f JW |
198 | /* Return a variant of TYPE which has all the type qualifiers of LIKE |
199 | as well as those of TYPE. */ | |
200 | ||
201 | static tree | |
202 | qualify_type (type, like) | |
203 | tree type, like; | |
204 | { | |
afbadaa7 MM |
205 | return c_build_qualified_type (type, |
206 | TYPE_QUALS (type) | TYPE_QUALS (like)); | |
400fbf9f JW |
207 | } |
208 | \f | |
209 | /* Return the common type of two types. | |
210 | We assume that comptypes has already been done and returned 1; | |
6cb72a7d RS |
211 | if that isn't so, this may crash. In particular, we assume that qualifiers |
212 | match. | |
400fbf9f JW |
213 | |
214 | This is the type for the result of most arithmetic operations | |
6cb72a7d | 215 | if the operands have the given two types. */ |
400fbf9f JW |
216 | |
217 | tree | |
218 | common_type (t1, t2) | |
219 | tree t1, t2; | |
220 | { | |
b3694847 SS |
221 | enum tree_code code1; |
222 | enum tree_code code2; | |
4b027d16 | 223 | tree attributes; |
400fbf9f JW |
224 | |
225 | /* Save time if the two types are the same. */ | |
226 | ||
227 | if (t1 == t2) return t1; | |
228 | ||
229 | /* If one type is nonsense, use the other. */ | |
230 | if (t1 == error_mark_node) | |
231 | return t2; | |
232 | if (t2 == error_mark_node) | |
233 | return t1; | |
234 | ||
d9525bec | 235 | /* Merge the attributes. */ |
f6897b10 | 236 | attributes = (*targetm.merge_type_attributes) (t1, t2); |
4b027d16 | 237 | |
400fbf9f JW |
238 | /* Treat an enum type as the unsigned integer type of the same width. */ |
239 | ||
240 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
b0c48229 | 241 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), 1); |
400fbf9f | 242 | if (TREE_CODE (t2) == ENUMERAL_TYPE) |
b0c48229 | 243 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), 1); |
400fbf9f JW |
244 | |
245 | code1 = TREE_CODE (t1); | |
246 | code2 = TREE_CODE (t2); | |
247 | ||
75326e8c RK |
248 | /* If one type is complex, form the common type of the non-complex |
249 | components, then make that complex. Use T1 or T2 if it is the | |
250 | required type. */ | |
b6a10c9f RS |
251 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) |
252 | { | |
75326e8c RK |
253 | tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; |
254 | tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; | |
255 | tree subtype = common_type (subtype1, subtype2); | |
256 | ||
257 | if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) | |
4b027d16 | 258 | return build_type_attribute_variant (t1, attributes); |
75326e8c | 259 | else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) |
4b027d16 | 260 | return build_type_attribute_variant (t2, attributes); |
b6a10c9f | 261 | else |
4b027d16 RK |
262 | return build_type_attribute_variant (build_complex_type (subtype), |
263 | attributes); | |
b6a10c9f RS |
264 | } |
265 | ||
400fbf9f JW |
266 | switch (code1) |
267 | { | |
268 | case INTEGER_TYPE: | |
269 | case REAL_TYPE: | |
270 | /* If only one is real, use it as the result. */ | |
271 | ||
272 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
4b027d16 | 273 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
274 | |
275 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
4b027d16 | 276 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
277 | |
278 | /* Both real or both integers; use the one with greater precision. */ | |
279 | ||
280 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
4b027d16 | 281 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 282 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
4b027d16 | 283 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
284 | |
285 | /* Same precision. Prefer longs to ints even when same size. */ | |
286 | ||
36618528 RS |
287 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
288 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
4b027d16 RK |
289 | return build_type_attribute_variant (long_unsigned_type_node, |
290 | attributes); | |
400fbf9f | 291 | |
36618528 RS |
292 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node |
293 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
400fbf9f JW |
294 | { |
295 | /* But preserve unsignedness from the other type, | |
296 | since long cannot hold all the values of an unsigned int. */ | |
297 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
4b027d16 RK |
298 | t1 = long_unsigned_type_node; |
299 | else | |
300 | t1 = long_integer_type_node; | |
301 | return build_type_attribute_variant (t1, attributes); | |
400fbf9f JW |
302 | } |
303 | ||
e9a25f70 JL |
304 | /* Likewise, prefer long double to double even if same size. */ |
305 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node | |
306 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
307 | return build_type_attribute_variant (long_double_type_node, | |
308 | attributes); | |
309 | ||
400fbf9f JW |
310 | /* Otherwise prefer the unsigned one. */ |
311 | ||
312 | if (TREE_UNSIGNED (t1)) | |
4b027d16 RK |
313 | return build_type_attribute_variant (t1, attributes); |
314 | else | |
315 | return build_type_attribute_variant (t2, attributes); | |
400fbf9f JW |
316 | |
317 | case POINTER_TYPE: | |
400fbf9f JW |
318 | /* For two pointers, do this recursively on the target type, |
319 | and combine the qualifiers of the two types' targets. */ | |
8706edbc RS |
320 | /* This code was turned off; I don't know why. |
321 | But ANSI C specifies doing this with the qualifiers. | |
322 | So I turned it on again. */ | |
400fbf9f | 323 | { |
3932261a MM |
324 | tree pointed_to_1 = TREE_TYPE (t1); |
325 | tree pointed_to_2 = TREE_TYPE (t2); | |
326 | tree target = common_type (TYPE_MAIN_VARIANT (pointed_to_1), | |
327 | TYPE_MAIN_VARIANT (pointed_to_2)); | |
328 | t1 = build_pointer_type (c_build_qualified_type | |
329 | (target, | |
330 | TYPE_QUALS (pointed_to_1) | | |
331 | TYPE_QUALS (pointed_to_2))); | |
4b027d16 | 332 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 333 | } |
8706edbc | 334 | #if 0 |
4b027d16 RK |
335 | t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); |
336 | return build_type_attribute_variant (t1, attributes); | |
8706edbc | 337 | #endif |
400fbf9f JW |
338 | |
339 | case ARRAY_TYPE: | |
340 | { | |
341 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
342 | /* Save space: see if the result is identical to one of the args. */ | |
343 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
4b027d16 | 344 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 345 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
4b027d16 | 346 | return build_type_attribute_variant (t2, attributes); |
400fbf9f | 347 | /* Merge the element types, and have a size if either arg has one. */ |
4b027d16 RK |
348 | t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); |
349 | return build_type_attribute_variant (t1, attributes); | |
400fbf9f JW |
350 | } |
351 | ||
352 | case FUNCTION_TYPE: | |
353 | /* Function types: prefer the one that specified arg types. | |
354 | If both do, merge the arg types. Also merge the return types. */ | |
355 | { | |
356 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
357 | tree p1 = TYPE_ARG_TYPES (t1); | |
358 | tree p2 = TYPE_ARG_TYPES (t2); | |
359 | int len; | |
360 | tree newargs, n; | |
361 | int i; | |
362 | ||
363 | /* Save space: see if the result is identical to one of the args. */ | |
364 | if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2)) | |
4b027d16 | 365 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 366 | if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1)) |
4b027d16 | 367 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
368 | |
369 | /* Simple way if one arg fails to specify argument types. */ | |
370 | if (TYPE_ARG_TYPES (t1) == 0) | |
4b027d16 RK |
371 | { |
372 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2)); | |
373 | return build_type_attribute_variant (t1, attributes); | |
374 | } | |
400fbf9f | 375 | if (TYPE_ARG_TYPES (t2) == 0) |
4b027d16 RK |
376 | { |
377 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
378 | return build_type_attribute_variant (t1, attributes); | |
379 | } | |
400fbf9f JW |
380 | |
381 | /* If both args specify argument types, we must merge the two | |
382 | lists, argument by argument. */ | |
383 | ||
2f4e8f2b JJ |
384 | pushlevel (0); |
385 | declare_parm_level (1); | |
386 | ||
400fbf9f JW |
387 | len = list_length (p1); |
388 | newargs = 0; | |
389 | ||
390 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 391 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
392 | |
393 | n = newargs; | |
394 | ||
395 | for (; p1; | |
396 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
397 | { | |
398 | /* A null type means arg type is not specified. | |
399 | Take whatever the other function type has. */ | |
400 | if (TREE_VALUE (p1) == 0) | |
401 | { | |
402 | TREE_VALUE (n) = TREE_VALUE (p2); | |
403 | goto parm_done; | |
404 | } | |
405 | if (TREE_VALUE (p2) == 0) | |
406 | { | |
407 | TREE_VALUE (n) = TREE_VALUE (p1); | |
408 | goto parm_done; | |
409 | } | |
410 | ||
411 | /* Given wait (union {union wait *u; int *i} *) | |
412 | and wait (union wait *), | |
413 | prefer union wait * as type of parm. */ | |
414 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
415 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
416 | { | |
417 | tree memb; | |
418 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); | |
419 | memb; memb = TREE_CHAIN (memb)) | |
420 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2))) | |
421 | { | |
422 | TREE_VALUE (n) = TREE_VALUE (p2); | |
423 | if (pedantic) | |
89abf8d1 | 424 | pedwarn ("function types not truly compatible in ISO C"); |
400fbf9f JW |
425 | goto parm_done; |
426 | } | |
427 | } | |
428 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
429 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
430 | { | |
431 | tree memb; | |
432 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); | |
433 | memb; memb = TREE_CHAIN (memb)) | |
434 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1))) | |
435 | { | |
436 | TREE_VALUE (n) = TREE_VALUE (p1); | |
437 | if (pedantic) | |
89abf8d1 | 438 | pedwarn ("function types not truly compatible in ISO C"); |
400fbf9f JW |
439 | goto parm_done; |
440 | } | |
441 | } | |
442 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
443 | parm_done: ; | |
444 | } | |
445 | ||
2f4e8f2b JJ |
446 | poplevel (0, 0, 0); |
447 | ||
4b027d16 | 448 | t1 = build_function_type (valtype, newargs); |
0f41302f | 449 | /* ... falls through ... */ |
400fbf9f JW |
450 | } |
451 | ||
452 | default: | |
4b027d16 | 453 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
454 | } |
455 | ||
456 | } | |
457 | \f | |
458 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
459 | or various other operations. Return 2 if they are compatible | |
460 | but a warning may be needed if you use them together. */ | |
461 | ||
462 | int | |
463 | comptypes (type1, type2) | |
464 | tree type1, type2; | |
465 | { | |
b3694847 SS |
466 | tree t1 = type1; |
467 | tree t2 = type2; | |
4b027d16 | 468 | int attrval, val; |
400fbf9f JW |
469 | |
470 | /* Suppress errors caused by previously reported errors. */ | |
471 | ||
8d47dfc5 RH |
472 | if (t1 == t2 || !t1 || !t2 |
473 | || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
400fbf9f JW |
474 | return 1; |
475 | ||
21318741 RK |
476 | /* If either type is the internal version of sizetype, return the |
477 | language version. */ | |
478 | if (TREE_CODE (t1) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t1) | |
479 | && TYPE_DOMAIN (t1) != 0) | |
480 | t1 = TYPE_DOMAIN (t1); | |
481 | ||
482 | if (TREE_CODE (t2) == INTEGER_TYPE && TYPE_IS_SIZETYPE (t2) | |
483 | && TYPE_DOMAIN (t2) != 0) | |
484 | t2 = TYPE_DOMAIN (t2); | |
485 | ||
b8c21346 RK |
486 | /* Treat an enum type as the integer type of the same width and |
487 | signedness. */ | |
400fbf9f JW |
488 | |
489 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
b0c48229 | 490 | t1 = c_common_type_for_size (TYPE_PRECISION (t1), TREE_UNSIGNED (t1)); |
400fbf9f | 491 | if (TREE_CODE (t2) == ENUMERAL_TYPE) |
b0c48229 | 492 | t2 = c_common_type_for_size (TYPE_PRECISION (t2), TREE_UNSIGNED (t2)); |
400fbf9f JW |
493 | |
494 | if (t1 == t2) | |
495 | return 1; | |
496 | ||
497 | /* Different classes of types can't be compatible. */ | |
498 | ||
499 | if (TREE_CODE (t1) != TREE_CODE (t2)) return 0; | |
500 | ||
501 | /* Qualifiers must match. */ | |
502 | ||
3932261a | 503 | if (TYPE_QUALS (t1) != TYPE_QUALS (t2)) |
400fbf9f JW |
504 | return 0; |
505 | ||
08632da2 RS |
506 | /* Allow for two different type nodes which have essentially the same |
507 | definition. Note that we already checked for equality of the type | |
38e01259 | 508 | qualifiers (just above). */ |
400fbf9f JW |
509 | |
510 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
511 | return 1; | |
512 | ||
4b027d16 | 513 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ |
f6897b10 | 514 | if (! (attrval = (*targetm.comp_type_attributes) (t1, t2))) |
4b027d16 RK |
515 | return 0; |
516 | ||
517 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
518 | val = 0; | |
519 | ||
400fbf9f JW |
520 | switch (TREE_CODE (t1)) |
521 | { | |
522 | case POINTER_TYPE: | |
4b027d16 | 523 | val = (TREE_TYPE (t1) == TREE_TYPE (t2) |
400fbf9f | 524 | ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2))); |
4b027d16 | 525 | break; |
400fbf9f JW |
526 | |
527 | case FUNCTION_TYPE: | |
4b027d16 RK |
528 | val = function_types_compatible_p (t1, t2); |
529 | break; | |
400fbf9f JW |
530 | |
531 | case ARRAY_TYPE: | |
532 | { | |
400fbf9f JW |
533 | tree d1 = TYPE_DOMAIN (t1); |
534 | tree d2 = TYPE_DOMAIN (t2); | |
3f85558f RH |
535 | bool d1_variable, d2_variable; |
536 | bool d1_zero, d2_zero; | |
4b027d16 | 537 | val = 1; |
400fbf9f JW |
538 | |
539 | /* Target types must match incl. qualifiers. */ | |
540 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
541 | && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))) | |
542 | return 0; | |
543 | ||
544 | /* Sizes must match unless one is missing or variable. */ | |
3f85558f | 545 | if (d1 == 0 || d2 == 0 || d1 == d2) |
4b027d16 | 546 | break; |
400fbf9f | 547 | |
3f85558f RH |
548 | d1_zero = ! TYPE_MAX_VALUE (d1); |
549 | d2_zero = ! TYPE_MAX_VALUE (d2); | |
550 | ||
551 | d1_variable = (! d1_zero | |
552 | && (TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
553 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST)); | |
554 | d2_variable = (! d2_zero | |
555 | && (TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
556 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)); | |
557 | ||
558 | if (d1_variable || d2_variable) | |
559 | break; | |
560 | if (d1_zero && d2_zero) | |
561 | break; | |
562 | if (d1_zero || d2_zero | |
563 | || ! tree_int_cst_equal (TYPE_MIN_VALUE (d1), TYPE_MIN_VALUE (d2)) | |
05bccae2 RK |
564 | || ! tree_int_cst_equal (TYPE_MAX_VALUE (d1), TYPE_MAX_VALUE (d2))) |
565 | val = 0; | |
566 | ||
4b027d16 | 567 | break; |
400fbf9f JW |
568 | } |
569 | ||
570 | case RECORD_TYPE: | |
0f7866e7 | 571 | if (flag_objc && objc_comptypes (t1, t2, 0) == 1) |
4b027d16 RK |
572 | val = 1; |
573 | break; | |
e9a25f70 JL |
574 | |
575 | default: | |
576 | break; | |
400fbf9f | 577 | } |
4b027d16 | 578 | return attrval == 2 && val == 1 ? 2 : val; |
400fbf9f JW |
579 | } |
580 | ||
581 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
582 | ignoring their qualifiers. */ | |
583 | ||
584 | static int | |
585 | comp_target_types (ttl, ttr) | |
586 | tree ttl, ttr; | |
587 | { | |
392202b0 | 588 | int val; |
8b40563c | 589 | |
392202b0 | 590 | /* Give maybe_objc_comptypes a crack at letting these types through. */ |
0f7866e7 | 591 | if ((val = objc_comptypes (ttl, ttr, 1)) >= 0) |
392202b0 | 592 | return val; |
8b40563c | 593 | |
392202b0 TW |
594 | val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)), |
595 | TYPE_MAIN_VARIANT (TREE_TYPE (ttr))); | |
8b40563c | 596 | |
400fbf9f JW |
597 | if (val == 2 && pedantic) |
598 | pedwarn ("types are not quite compatible"); | |
599 | return val; | |
600 | } | |
601 | \f | |
602 | /* Subroutines of `comptypes'. */ | |
603 | ||
604 | /* Return 1 if two function types F1 and F2 are compatible. | |
605 | If either type specifies no argument types, | |
606 | the other must specify a fixed number of self-promoting arg types. | |
607 | Otherwise, if one type specifies only the number of arguments, | |
608 | the other must specify that number of self-promoting arg types. | |
609 | Otherwise, the argument types must match. */ | |
610 | ||
611 | static int | |
612 | function_types_compatible_p (f1, f2) | |
613 | tree f1, f2; | |
614 | { | |
615 | tree args1, args2; | |
616 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
617 | int val = 1; | |
618 | int val1; | |
619 | ||
620 | if (!(TREE_TYPE (f1) == TREE_TYPE (f2) | |
621 | || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2))))) | |
622 | return 0; | |
623 | ||
624 | args1 = TYPE_ARG_TYPES (f1); | |
625 | args2 = TYPE_ARG_TYPES (f2); | |
626 | ||
627 | /* An unspecified parmlist matches any specified parmlist | |
628 | whose argument types don't need default promotions. */ | |
629 | ||
630 | if (args1 == 0) | |
631 | { | |
632 | if (!self_promoting_args_p (args2)) | |
633 | return 0; | |
634 | /* If one of these types comes from a non-prototype fn definition, | |
635 | compare that with the other type's arglist. | |
636 | If they don't match, ask for a warning (but no error). */ | |
637 | if (TYPE_ACTUAL_ARG_TYPES (f1) | |
638 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) | |
639 | val = 2; | |
640 | return val; | |
641 | } | |
642 | if (args2 == 0) | |
643 | { | |
644 | if (!self_promoting_args_p (args1)) | |
645 | return 0; | |
646 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
647 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) | |
648 | val = 2; | |
649 | return val; | |
650 | } | |
651 | ||
652 | /* Both types have argument lists: compare them and propagate results. */ | |
653 | val1 = type_lists_compatible_p (args1, args2); | |
654 | return val1 != 1 ? val1 : val; | |
655 | } | |
656 | ||
657 | /* Check two lists of types for compatibility, | |
658 | returning 0 for incompatible, 1 for compatible, | |
659 | or 2 for compatible with warning. */ | |
660 | ||
661 | static int | |
662 | type_lists_compatible_p (args1, args2) | |
663 | tree args1, args2; | |
664 | { | |
665 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
666 | int val = 1; | |
9d5f3e49 | 667 | int newval = 0; |
400fbf9f JW |
668 | |
669 | while (1) | |
670 | { | |
671 | if (args1 == 0 && args2 == 0) | |
672 | return val; | |
673 | /* If one list is shorter than the other, | |
674 | they fail to match. */ | |
675 | if (args1 == 0 || args2 == 0) | |
676 | return 0; | |
677 | /* A null pointer instead of a type | |
678 | means there is supposed to be an argument | |
679 | but nothing is specified about what type it has. | |
680 | So match anything that self-promotes. */ | |
681 | if (TREE_VALUE (args1) == 0) | |
682 | { | |
ab393bf1 | 683 | if (c_type_promotes_to (TREE_VALUE (args2)) != TREE_VALUE (args2)) |
400fbf9f JW |
684 | return 0; |
685 | } | |
686 | else if (TREE_VALUE (args2) == 0) | |
687 | { | |
ab393bf1 | 688 | if (c_type_promotes_to (TREE_VALUE (args1)) != TREE_VALUE (args1)) |
400fbf9f JW |
689 | return 0; |
690 | } | |
0f38b811 MM |
691 | else if (! (newval = comptypes (TYPE_MAIN_VARIANT (TREE_VALUE (args1)), |
692 | TYPE_MAIN_VARIANT (TREE_VALUE (args2))))) | |
400fbf9f JW |
693 | { |
694 | /* Allow wait (union {union wait *u; int *i} *) | |
695 | and wait (union wait *) to be compatible. */ | |
696 | if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE | |
ea3373cd RK |
697 | && (TYPE_NAME (TREE_VALUE (args1)) == 0 |
698 | || TYPE_TRANSPARENT_UNION (TREE_VALUE (args1))) | |
400fbf9f JW |
699 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST |
700 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)), | |
701 | TYPE_SIZE (TREE_VALUE (args2)))) | |
702 | { | |
703 | tree memb; | |
704 | for (memb = TYPE_FIELDS (TREE_VALUE (args1)); | |
705 | memb; memb = TREE_CHAIN (memb)) | |
706 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2))) | |
707 | break; | |
708 | if (memb == 0) | |
709 | return 0; | |
710 | } | |
711 | else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE | |
ea3373cd RK |
712 | && (TYPE_NAME (TREE_VALUE (args2)) == 0 |
713 | || TYPE_TRANSPARENT_UNION (TREE_VALUE (args2))) | |
400fbf9f JW |
714 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST |
715 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)), | |
716 | TYPE_SIZE (TREE_VALUE (args1)))) | |
717 | { | |
718 | tree memb; | |
719 | for (memb = TYPE_FIELDS (TREE_VALUE (args2)); | |
720 | memb; memb = TREE_CHAIN (memb)) | |
721 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1))) | |
722 | break; | |
723 | if (memb == 0) | |
724 | return 0; | |
725 | } | |
726 | else | |
727 | return 0; | |
728 | } | |
729 | ||
730 | /* comptypes said ok, but record if it said to warn. */ | |
731 | if (newval > val) | |
732 | val = newval; | |
733 | ||
734 | args1 = TREE_CHAIN (args1); | |
735 | args2 = TREE_CHAIN (args2); | |
736 | } | |
737 | } | |
400fbf9f | 738 | \f |
400fbf9f JW |
739 | /* Compute the size to increment a pointer by. */ |
740 | ||
741 | tree | |
742 | c_size_in_bytes (type) | |
743 | tree type; | |
744 | { | |
745 | enum tree_code code = TREE_CODE (type); | |
746 | ||
fed3cef0 RK |
747 | if (code == FUNCTION_TYPE || code == VOID_TYPE || code == ERROR_MARK) |
748 | return size_one_node; | |
749 | ||
d0f062fb | 750 | if (!COMPLETE_OR_VOID_TYPE_P (type)) |
400fbf9f JW |
751 | { |
752 | error ("arithmetic on pointer to an incomplete type"); | |
fed3cef0 | 753 | return size_one_node; |
400fbf9f JW |
754 | } |
755 | ||
756 | /* Convert in case a char is more than one unit. */ | |
fed3cef0 RK |
757 | return size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), |
758 | size_int (TYPE_PRECISION (char_type_node) | |
759 | / BITS_PER_UNIT)); | |
400fbf9f | 760 | } |
400fbf9f | 761 | \f |
400fbf9f JW |
762 | /* Return either DECL or its known constant value (if it has one). */ |
763 | ||
56cb9733 | 764 | tree |
400fbf9f JW |
765 | decl_constant_value (decl) |
766 | tree decl; | |
767 | { | |
a7c1916a | 768 | if (/* Don't change a variable array bound or initial value to a constant |
400fbf9f | 769 | in a place where a variable is invalid. */ |
a7c1916a | 770 | current_function_decl != 0 |
400fbf9f | 771 | && ! TREE_THIS_VOLATILE (decl) |
83bab8db | 772 | && TREE_READONLY (decl) |
400fbf9f JW |
773 | && DECL_INITIAL (decl) != 0 |
774 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
775 | /* This is invalid if initial value is not constant. | |
776 | If it has either a function call, a memory reference, | |
777 | or a variable, then re-evaluating it could give different results. */ | |
778 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
779 | /* Check for cases where this is sub-optimal, even though valid. */ | |
2f74f7e9 | 780 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR) |
400fbf9f JW |
781 | return DECL_INITIAL (decl); |
782 | return decl; | |
783 | } | |
784 | ||
2f74f7e9 JM |
785 | /* Return either DECL or its known constant value (if it has one), but |
786 | return DECL if pedantic or DECL has mode BLKmode. This is for | |
787 | bug-compatibility with the old behavior of decl_constant_value | |
788 | (before GCC 3.0); every use of this function is a bug and it should | |
789 | be removed before GCC 3.1. It is not appropriate to use pedantic | |
790 | in a way that affects optimization, and BLKmode is probably not the | |
791 | right test for avoiding misoptimizations either. */ | |
792 | ||
793 | static tree | |
794 | decl_constant_value_for_broken_optimization (decl) | |
795 | tree decl; | |
796 | { | |
797 | if (pedantic || DECL_MODE (decl) == BLKmode) | |
798 | return decl; | |
799 | else | |
800 | return decl_constant_value (decl); | |
801 | } | |
802 | ||
207bf485 JM |
803 | |
804 | /* Perform the default conversion of arrays and functions to pointers. | |
805 | Return the result of converting EXP. For any other expression, just | |
806 | return EXP. */ | |
807 | ||
808 | static tree | |
809 | default_function_array_conversion (exp) | |
810 | tree exp; | |
811 | { | |
812 | tree orig_exp; | |
813 | tree type = TREE_TYPE (exp); | |
814 | enum tree_code code = TREE_CODE (type); | |
815 | int not_lvalue = 0; | |
816 | ||
817 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as | |
818 | an lvalue. | |
819 | ||
820 | Do not use STRIP_NOPS here! It will remove conversions from pointer | |
821 | to integer and cause infinite recursion. */ | |
822 | orig_exp = exp; | |
823 | while (TREE_CODE (exp) == NON_LVALUE_EXPR | |
824 | || (TREE_CODE (exp) == NOP_EXPR | |
825 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
826 | { | |
827 | if (TREE_CODE (exp) == NON_LVALUE_EXPR) | |
828 | not_lvalue = 1; | |
829 | exp = TREE_OPERAND (exp, 0); | |
830 | } | |
831 | ||
832 | /* Preserve the original expression code. */ | |
833 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (exp)))) | |
834 | C_SET_EXP_ORIGINAL_CODE (exp, C_EXP_ORIGINAL_CODE (orig_exp)); | |
835 | ||
836 | if (code == FUNCTION_TYPE) | |
837 | { | |
838 | return build_unary_op (ADDR_EXPR, exp, 0); | |
839 | } | |
840 | if (code == ARRAY_TYPE) | |
841 | { | |
842 | tree adr; | |
843 | tree restype = TREE_TYPE (type); | |
844 | tree ptrtype; | |
845 | int constp = 0; | |
846 | int volatilep = 0; | |
847 | int lvalue_array_p; | |
848 | ||
849 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' || DECL_P (exp)) | |
850 | { | |
851 | constp = TREE_READONLY (exp); | |
852 | volatilep = TREE_THIS_VOLATILE (exp); | |
853 | } | |
854 | ||
855 | if (TYPE_QUALS (type) || constp || volatilep) | |
856 | restype | |
857 | = c_build_qualified_type (restype, | |
858 | TYPE_QUALS (type) | |
859 | | (constp * TYPE_QUAL_CONST) | |
860 | | (volatilep * TYPE_QUAL_VOLATILE)); | |
861 | ||
862 | if (TREE_CODE (exp) == INDIRECT_REF) | |
863 | return convert (TYPE_POINTER_TO (restype), | |
864 | TREE_OPERAND (exp, 0)); | |
865 | ||
866 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
867 | { | |
868 | tree op1 = default_conversion (TREE_OPERAND (exp, 1)); | |
869 | return build (COMPOUND_EXPR, TREE_TYPE (op1), | |
870 | TREE_OPERAND (exp, 0), op1); | |
871 | } | |
872 | ||
873 | lvalue_array_p = !not_lvalue && lvalue_p (exp); | |
db3acfa5 | 874 | if (!flag_isoc99 && !lvalue_array_p) |
207bf485 JM |
875 | { |
876 | /* Before C99, non-lvalue arrays do not decay to pointers. | |
877 | Normally, using such an array would be invalid; but it can | |
878 | be used correctly inside sizeof or as a statement expression. | |
879 | Thus, do not give an error here; an error will result later. */ | |
880 | return exp; | |
881 | } | |
882 | ||
883 | ptrtype = build_pointer_type (restype); | |
884 | ||
885 | if (TREE_CODE (exp) == VAR_DECL) | |
886 | { | |
887 | /* ??? This is not really quite correct | |
888 | in that the type of the operand of ADDR_EXPR | |
889 | is not the target type of the type of the ADDR_EXPR itself. | |
890 | Question is, can this lossage be avoided? */ | |
891 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
dffd7eb6 | 892 | if (!c_mark_addressable (exp)) |
207bf485 JM |
893 | return error_mark_node; |
894 | TREE_CONSTANT (adr) = staticp (exp); | |
895 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
896 | return adr; | |
897 | } | |
898 | /* This way is better for a COMPONENT_REF since it can | |
899 | simplify the offset for a component. */ | |
900 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
901 | return convert (ptrtype, adr); | |
902 | } | |
903 | return exp; | |
904 | } | |
905 | ||
400fbf9f JW |
906 | /* Perform default promotions for C data used in expressions. |
907 | Arrays and functions are converted to pointers; | |
908 | enumeral types or short or char, to int. | |
909 | In addition, manifest constants symbols are replaced by their values. */ | |
910 | ||
911 | tree | |
912 | default_conversion (exp) | |
913 | tree exp; | |
914 | { | |
157689c6 | 915 | tree orig_exp; |
b3694847 SS |
916 | tree type = TREE_TYPE (exp); |
917 | enum tree_code code = TREE_CODE (type); | |
400fbf9f | 918 | |
207bf485 JM |
919 | if (code == FUNCTION_TYPE || code == ARRAY_TYPE) |
920 | return default_function_array_conversion (exp); | |
921 | ||
400fbf9f JW |
922 | /* Constants can be used directly unless they're not loadable. */ |
923 | if (TREE_CODE (exp) == CONST_DECL) | |
924 | exp = DECL_INITIAL (exp); | |
d4424a75 RK |
925 | |
926 | /* Replace a nonvolatile const static variable with its value unless | |
927 | it is an array, in which case we must be sure that taking the | |
928 | address of the array produces consistent results. */ | |
929 | else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE) | |
400fbf9f | 930 | { |
2f74f7e9 | 931 | exp = decl_constant_value_for_broken_optimization (exp); |
400fbf9f JW |
932 | type = TREE_TYPE (exp); |
933 | } | |
934 | ||
a7d53fce | 935 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as |
05bccae2 RK |
936 | an lvalue. |
937 | ||
938 | Do not use STRIP_NOPS here! It will remove conversions from pointer | |
a7d53fce | 939 | to integer and cause infinite recursion. */ |
157689c6 | 940 | orig_exp = exp; |
a7d53fce RS |
941 | while (TREE_CODE (exp) == NON_LVALUE_EXPR |
942 | || (TREE_CODE (exp) == NOP_EXPR | |
943 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
944 | exp = TREE_OPERAND (exp, 0); | |
400fbf9f | 945 | |
157689c6 NB |
946 | /* Preserve the original expression code. */ |
947 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (exp)))) | |
948 | C_SET_EXP_ORIGINAL_CODE (exp, C_EXP_ORIGINAL_CODE (orig_exp)); | |
949 | ||
400fbf9f JW |
950 | /* Normally convert enums to int, |
951 | but convert wide enums to something wider. */ | |
952 | if (code == ENUMERAL_TYPE) | |
953 | { | |
b0c48229 NB |
954 | type = c_common_type_for_size (MAX (TYPE_PRECISION (type), |
955 | TYPE_PRECISION (integer_type_node)), | |
956 | ((TYPE_PRECISION (type) | |
957 | >= TYPE_PRECISION (integer_type_node)) | |
958 | && TREE_UNSIGNED (type))); | |
05bccae2 | 959 | |
400fbf9f JW |
960 | return convert (type, exp); |
961 | } | |
962 | ||
9753f113 | 963 | if (TREE_CODE (exp) == COMPONENT_REF |
05bccae2 | 964 | && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1)) |
cff9c407 | 965 | /* If it's thinner than an int, promote it like a |
d72040f5 | 966 | c_promoting_integer_type_p, otherwise leave it alone. */ |
05bccae2 RK |
967 | && 0 > compare_tree_int (DECL_SIZE (TREE_OPERAND (exp, 1)), |
968 | TYPE_PRECISION (integer_type_node))) | |
f458d1d5 | 969 | return convert (integer_type_node, exp); |
9753f113 | 970 | |
d72040f5 | 971 | if (c_promoting_integer_type_p (type)) |
400fbf9f | 972 | { |
f458d1d5 | 973 | /* Preserve unsignedness if not really getting any wider. */ |
e83d45c4 | 974 | if (TREE_UNSIGNED (type) |
f458d1d5 | 975 | && TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) |
400fbf9f | 976 | return convert (unsigned_type_node, exp); |
05bccae2 | 977 | |
400fbf9f JW |
978 | return convert (integer_type_node, exp); |
979 | } | |
05bccae2 | 980 | |
400fbf9f JW |
981 | if (code == VOID_TYPE) |
982 | { | |
983 | error ("void value not ignored as it ought to be"); | |
984 | return error_mark_node; | |
985 | } | |
400fbf9f JW |
986 | return exp; |
987 | } | |
988 | \f | |
e9b2c823 NB |
989 | /* Look up COMPONENT in a structure or union DECL. |
990 | ||
991 | If the component name is not found, returns NULL_TREE. Otherwise, | |
992 | the return value is a TREE_LIST, with each TREE_VALUE a FIELD_DECL | |
993 | stepping down the chain to the component, which is in the last | |
994 | TREE_VALUE of the list. Normally the list is of length one, but if | |
995 | the component is embedded within (nested) anonymous structures or | |
996 | unions, the list steps down the chain to the component. */ | |
2f2d13da DE |
997 | |
998 | static tree | |
e9b2c823 NB |
999 | lookup_field (decl, component) |
1000 | tree decl, component; | |
2f2d13da | 1001 | { |
e9b2c823 | 1002 | tree type = TREE_TYPE (decl); |
2f2d13da DE |
1003 | tree field; |
1004 | ||
1005 | /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1006 | to the field elements. Use a binary search on this array to quickly | |
1007 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1008 | will always be set for structures which have many elements. */ | |
1009 | ||
1010 | if (TYPE_LANG_SPECIFIC (type)) | |
1011 | { | |
1012 | int bot, top, half; | |
1013 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0]; | |
1014 | ||
1015 | field = TYPE_FIELDS (type); | |
1016 | bot = 0; | |
1017 | top = TYPE_LANG_SPECIFIC (type)->len; | |
1018 | while (top - bot > 1) | |
1019 | { | |
2f2d13da DE |
1020 | half = (top - bot + 1) >> 1; |
1021 | field = field_array[bot+half]; | |
1022 | ||
1023 | if (DECL_NAME (field) == NULL_TREE) | |
1024 | { | |
1025 | /* Step through all anon unions in linear fashion. */ | |
1026 | while (DECL_NAME (field_array[bot]) == NULL_TREE) | |
1027 | { | |
2f2d13da | 1028 | field = field_array[bot++]; |
a68b98cf RK |
1029 | if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
1030 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
19d76e60 | 1031 | { |
e9b2c823 NB |
1032 | tree anon = lookup_field (field, component); |
1033 | ||
1034 | if (anon) | |
1035 | return tree_cons (NULL_TREE, field, anon); | |
1036 | } | |
2f2d13da DE |
1037 | } |
1038 | ||
1039 | /* Entire record is only anon unions. */ | |
1040 | if (bot > top) | |
1041 | return NULL_TREE; | |
1042 | ||
1043 | /* Restart the binary search, with new lower bound. */ | |
1044 | continue; | |
1045 | } | |
1046 | ||
e8b87aac | 1047 | if (DECL_NAME (field) == component) |
2f2d13da | 1048 | break; |
e8b87aac | 1049 | if (DECL_NAME (field) < component) |
2f2d13da DE |
1050 | bot += half; |
1051 | else | |
1052 | top = bot + half; | |
1053 | } | |
1054 | ||
1055 | if (DECL_NAME (field_array[bot]) == component) | |
1056 | field = field_array[bot]; | |
1057 | else if (DECL_NAME (field) != component) | |
e9b2c823 | 1058 | return NULL_TREE; |
2f2d13da DE |
1059 | } |
1060 | else | |
1061 | { | |
1062 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1063 | { | |
e9b2c823 NB |
1064 | if (DECL_NAME (field) == NULL_TREE |
1065 | && (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
1066 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE)) | |
2f2d13da | 1067 | { |
e9b2c823 | 1068 | tree anon = lookup_field (field, component); |
a68b98cf | 1069 | |
e9b2c823 NB |
1070 | if (anon) |
1071 | return tree_cons (NULL_TREE, field, anon); | |
2f2d13da DE |
1072 | } |
1073 | ||
1074 | if (DECL_NAME (field) == component) | |
1075 | break; | |
1076 | } | |
e9b2c823 NB |
1077 | |
1078 | if (field == NULL_TREE) | |
1079 | return NULL_TREE; | |
2f2d13da DE |
1080 | } |
1081 | ||
e9b2c823 | 1082 | return tree_cons (NULL_TREE, field, NULL_TREE); |
2f2d13da DE |
1083 | } |
1084 | ||
400fbf9f JW |
1085 | /* Make an expression to refer to the COMPONENT field of |
1086 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1087 | ||
1088 | tree | |
1089 | build_component_ref (datum, component) | |
1090 | tree datum, component; | |
1091 | { | |
b3694847 SS |
1092 | tree type = TREE_TYPE (datum); |
1093 | enum tree_code code = TREE_CODE (type); | |
1094 | tree field = NULL; | |
1095 | tree ref; | |
400fbf9f | 1096 | |
207bf485 JM |
1097 | /* If DATUM is a COMPOUND_EXPR, move our reference inside it. |
1098 | If pedantic ensure that the arguments are not lvalues; otherwise, | |
1099 | if the component is an array, it would wrongly decay to a pointer in | |
1100 | C89 mode. | |
1101 | We cannot do this with a COND_EXPR, because in a conditional expression | |
1102 | the default promotions are applied to both sides, and this would yield | |
1103 | the wrong type of the result; for example, if the components have | |
1104 | type "char". */ | |
400fbf9f JW |
1105 | switch (TREE_CODE (datum)) |
1106 | { | |
1107 | case COMPOUND_EXPR: | |
1108 | { | |
1109 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component); | |
400fbf9f | 1110 | return build (COMPOUND_EXPR, TREE_TYPE (value), |
207bf485 | 1111 | TREE_OPERAND (datum, 0), pedantic_non_lvalue (value)); |
400fbf9f | 1112 | } |
e9a25f70 JL |
1113 | default: |
1114 | break; | |
400fbf9f JW |
1115 | } |
1116 | ||
1117 | /* See if there is a field or component with name COMPONENT. */ | |
1118 | ||
1119 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1120 | { | |
d0f062fb | 1121 | if (!COMPLETE_TYPE_P (type)) |
400fbf9f | 1122 | { |
7a228918 | 1123 | c_incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1124 | return error_mark_node; |
1125 | } | |
1126 | ||
e9b2c823 | 1127 | field = lookup_field (datum, component); |
400fbf9f JW |
1128 | |
1129 | if (!field) | |
1130 | { | |
913d0833 KG |
1131 | error ("%s has no member named `%s'", |
1132 | code == RECORD_TYPE ? "structure" : "union", | |
400fbf9f JW |
1133 | IDENTIFIER_POINTER (component)); |
1134 | return error_mark_node; | |
1135 | } | |
400fbf9f | 1136 | |
e9b2c823 NB |
1137 | /* Chain the COMPONENT_REFs if necessary down to the FIELD. |
1138 | This might be better solved in future the way the C++ front | |
1139 | end does it - by giving the anonymous entities each a | |
1140 | separate name and type, and then have build_component_ref | |
1141 | recursively call itself. We can't do that here. */ | |
1142 | for (; field; field = TREE_CHAIN (field)) | |
19d76e60 | 1143 | { |
e9b2c823 NB |
1144 | tree subdatum = TREE_VALUE (field); |
1145 | ||
1146 | if (TREE_TYPE (subdatum) == error_mark_node) | |
1147 | return error_mark_node; | |
1148 | ||
1149 | ref = build (COMPONENT_REF, TREE_TYPE (subdatum), datum, subdatum); | |
1150 | if (TREE_READONLY (datum) || TREE_READONLY (subdatum)) | |
19d76e60 | 1151 | TREE_READONLY (ref) = 1; |
e9b2c823 | 1152 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (subdatum)) |
19d76e60 | 1153 | TREE_THIS_VOLATILE (ref) = 1; |
e23bd218 IR |
1154 | |
1155 | if (TREE_DEPRECATED (subdatum)) | |
1156 | warn_deprecated_use (subdatum); | |
1157 | ||
19d76e60 RK |
1158 | datum = ref; |
1159 | } | |
1160 | ||
400fbf9f JW |
1161 | return ref; |
1162 | } | |
1163 | else if (code != ERROR_MARK) | |
1164 | error ("request for member `%s' in something not a structure or union", | |
1165 | IDENTIFIER_POINTER (component)); | |
1166 | ||
1167 | return error_mark_node; | |
1168 | } | |
1169 | \f | |
1170 | /* Given an expression PTR for a pointer, return an expression | |
1171 | for the value pointed to. | |
1172 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1173 | ||
1174 | tree | |
1175 | build_indirect_ref (ptr, errorstring) | |
1176 | tree ptr; | |
5d5993dd | 1177 | const char *errorstring; |
400fbf9f | 1178 | { |
b3694847 SS |
1179 | tree pointer = default_conversion (ptr); |
1180 | tree type = TREE_TYPE (pointer); | |
400fbf9f JW |
1181 | |
1182 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b RS |
1183 | { |
1184 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1185 | && !flag_volatile | |
1186 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) | |
1187 | == TREE_TYPE (type))) | |
1188 | return TREE_OPERAND (pointer, 0); | |
1189 | else | |
1190 | { | |
1191 | tree t = TREE_TYPE (type); | |
b3694847 | 1192 | tree ref = build1 (INDIRECT_REF, TYPE_MAIN_VARIANT (t), pointer); |
400fbf9f | 1193 | |
baae9b65 | 1194 | if (!COMPLETE_OR_VOID_TYPE_P (t) && TREE_CODE (t) != ARRAY_TYPE) |
870cc33b RS |
1195 | { |
1196 | error ("dereferencing pointer to incomplete type"); | |
1197 | return error_mark_node; | |
1198 | } | |
baae9b65 | 1199 | if (VOID_TYPE_P (t) && skip_evaluation == 0) |
870cc33b RS |
1200 | warning ("dereferencing `void *' pointer"); |
1201 | ||
1202 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
1203 | so that we get the proper error message if the result is used | |
1204 | to assign to. Also, &* is supposed to be a no-op. | |
1205 | And ANSI C seems to specify that the type of the result | |
1206 | should be the const type. */ | |
1207 | /* A de-reference of a pointer to const is not a const. It is valid | |
1208 | to change it via some other pointer. */ | |
1209 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
1210 | TREE_SIDE_EFFECTS (ref) | |
1211 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile; | |
493692cd | 1212 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); |
870cc33b RS |
1213 | return ref; |
1214 | } | |
1215 | } | |
400fbf9f JW |
1216 | else if (TREE_CODE (pointer) != ERROR_MARK) |
1217 | error ("invalid type argument of `%s'", errorstring); | |
1218 | return error_mark_node; | |
1219 | } | |
1220 | ||
1221 | /* This handles expressions of the form "a[i]", which denotes | |
1222 | an array reference. | |
1223 | ||
1224 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
1225 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
1226 | This avoids forcing the array out of registers, and can work on | |
1227 | arrays that are not lvalues (for example, members of structures returned | |
1228 | by functions). */ | |
1229 | ||
1230 | tree | |
1231 | build_array_ref (array, index) | |
1232 | tree array, index; | |
1233 | { | |
1234 | if (index == 0) | |
1235 | { | |
1236 | error ("subscript missing in array reference"); | |
1237 | return error_mark_node; | |
1238 | } | |
1239 | ||
1240 | if (TREE_TYPE (array) == error_mark_node | |
1241 | || TREE_TYPE (index) == error_mark_node) | |
1242 | return error_mark_node; | |
1243 | ||
1244 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE | |
1245 | && TREE_CODE (array) != INDIRECT_REF) | |
1246 | { | |
1247 | tree rval, type; | |
1248 | ||
400fbf9f JW |
1249 | /* Subscripting with type char is likely to lose |
1250 | on a machine where chars are signed. | |
1251 | So warn on any machine, but optionally. | |
1252 | Don't warn for unsigned char since that type is safe. | |
1253 | Don't warn for signed char because anyone who uses that | |
1254 | must have done so deliberately. */ | |
1255 | if (warn_char_subscripts | |
1256 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1257 | warning ("array subscript has type `char'"); | |
1258 | ||
0e51ef9b RS |
1259 | /* Apply default promotions *after* noticing character types. */ |
1260 | index = default_conversion (index); | |
1261 | ||
fdeefd49 RS |
1262 | /* Require integer *after* promotion, for sake of enums. */ |
1263 | if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE) | |
1264 | { | |
1265 | error ("array subscript is not an integer"); | |
1266 | return error_mark_node; | |
1267 | } | |
1268 | ||
400fbf9f JW |
1269 | /* An array that is indexed by a non-constant |
1270 | cannot be stored in a register; we must be able to do | |
1271 | address arithmetic on its address. | |
1272 | Likewise an array of elements of variable size. */ | |
1273 | if (TREE_CODE (index) != INTEGER_CST | |
d0f062fb | 1274 | || (COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (array))) |
400fbf9f JW |
1275 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) |
1276 | { | |
dffd7eb6 | 1277 | if (!c_mark_addressable (array)) |
400fbf9f JW |
1278 | return error_mark_node; |
1279 | } | |
e6d52559 JW |
1280 | /* An array that is indexed by a constant value which is not within |
1281 | the array bounds cannot be stored in a register either; because we | |
1282 | would get a crash in store_bit_field/extract_bit_field when trying | |
1283 | to access a non-existent part of the register. */ | |
1284 | if (TREE_CODE (index) == INTEGER_CST | |
1285 | && TYPE_VALUES (TREE_TYPE (array)) | |
1286 | && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array)))) | |
1287 | { | |
dffd7eb6 | 1288 | if (!c_mark_addressable (array)) |
e6d52559 JW |
1289 | return error_mark_node; |
1290 | } | |
400fbf9f | 1291 | |
400fbf9f JW |
1292 | if (pedantic) |
1293 | { | |
1294 | tree foo = array; | |
1295 | while (TREE_CODE (foo) == COMPONENT_REF) | |
1296 | foo = TREE_OPERAND (foo, 0); | |
1394aabd | 1297 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) |
05273f08 GK |
1298 | pedwarn ("ISO C forbids subscripting `register' array"); |
1299 | else if (! flag_isoc99 && ! lvalue_p (foo)) | |
56508306 | 1300 | pedwarn ("ISO C90 forbids subscripting non-lvalue array"); |
400fbf9f JW |
1301 | } |
1302 | ||
1303 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
1304 | rval = build (ARRAY_REF, type, array, index); | |
1305 | /* Array ref is const/volatile if the array elements are | |
1306 | or if the array is. */ | |
1307 | TREE_READONLY (rval) | |
1308 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
1309 | | TREE_READONLY (array)); | |
1310 | TREE_SIDE_EFFECTS (rval) | |
1311 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1312 | | TREE_SIDE_EFFECTS (array)); | |
1313 | TREE_THIS_VOLATILE (rval) | |
1314 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1315 | /* This was added by rms on 16 Nov 91. | |
1316 | It fixes vol struct foo *a; a->elts[1] | |
1317 | in an inline function. | |
1318 | Hope it doesn't break something else. */ | |
1319 | | TREE_THIS_VOLATILE (array)); | |
1320 | return require_complete_type (fold (rval)); | |
1321 | } | |
1322 | ||
1323 | { | |
1324 | tree ar = default_conversion (array); | |
1325 | tree ind = default_conversion (index); | |
1326 | ||
aed11452 RK |
1327 | /* Do the same warning check as above, but only on the part that's |
1328 | syntactically the index and only if it is also semantically | |
1329 | the index. */ | |
1330 | if (warn_char_subscripts | |
1331 | && TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE | |
1332 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1333 | warning ("subscript has type `char'"); | |
1334 | ||
400fbf9f JW |
1335 | /* Put the integer in IND to simplify error checking. */ |
1336 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
1337 | { | |
1338 | tree temp = ar; | |
1339 | ar = ind; | |
1340 | ind = temp; | |
1341 | } | |
1342 | ||
1343 | if (ar == error_mark_node) | |
1344 | return ar; | |
1345 | ||
004252d7 RK |
1346 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE |
1347 | || TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) == FUNCTION_TYPE) | |
400fbf9f JW |
1348 | { |
1349 | error ("subscripted value is neither array nor pointer"); | |
1350 | return error_mark_node; | |
1351 | } | |
1352 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
1353 | { | |
1354 | error ("array subscript is not an integer"); | |
1355 | return error_mark_node; | |
1356 | } | |
1357 | ||
1358 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0), | |
1359 | "array indexing"); | |
1360 | } | |
1361 | } | |
1362 | \f | |
7e585d16 ZW |
1363 | /* Build an external reference to identifier ID. FUN indicates |
1364 | whether this will be used for a function call. */ | |
1365 | tree | |
1366 | build_external_ref (id, fun) | |
1367 | tree id; | |
1368 | int fun; | |
1369 | { | |
1370 | tree ref; | |
1371 | tree decl = lookup_name (id); | |
1372 | tree objc_ivar = lookup_objc_ivar (id); | |
1373 | ||
e23bd218 IR |
1374 | if (decl && TREE_DEPRECATED (decl)) |
1375 | warn_deprecated_use (decl); | |
1376 | ||
7e585d16 ZW |
1377 | if (!decl || decl == error_mark_node || C_DECL_ANTICIPATED (decl)) |
1378 | { | |
1379 | if (objc_ivar) | |
1380 | ref = objc_ivar; | |
1381 | else if (fun) | |
1382 | { | |
1383 | if (!decl || decl == error_mark_node) | |
1384 | /* Ordinary implicit function declaration. */ | |
1385 | ref = implicitly_declare (id); | |
1386 | else | |
1387 | { | |
1388 | /* Implicit declaration of built-in function. Don't | |
1389 | change the built-in declaration, but don't let this | |
1390 | go by silently, either. */ | |
111458f1 ZW |
1391 | implicit_decl_warning (id); |
1392 | ||
1393 | /* only issue this warning once */ | |
1394 | C_DECL_ANTICIPATED (decl) = 0; | |
7e585d16 ZW |
1395 | ref = decl; |
1396 | } | |
1397 | } | |
1398 | else | |
1399 | { | |
1400 | /* Reference to undeclared variable, including reference to | |
1401 | builtin outside of function-call context. */ | |
1402 | if (current_function_decl == 0) | |
1403 | error ("`%s' undeclared here (not in a function)", | |
1404 | IDENTIFIER_POINTER (id)); | |
1405 | else | |
1406 | { | |
1407 | if (IDENTIFIER_GLOBAL_VALUE (id) != error_mark_node | |
1408 | || IDENTIFIER_ERROR_LOCUS (id) != current_function_decl) | |
1409 | { | |
1410 | error ("`%s' undeclared (first use in this function)", | |
1411 | IDENTIFIER_POINTER (id)); | |
1412 | ||
1413 | if (! undeclared_variable_notice) | |
1414 | { | |
1415 | error ("(Each undeclared identifier is reported only once"); | |
1416 | error ("for each function it appears in.)"); | |
1417 | undeclared_variable_notice = 1; | |
1418 | } | |
1419 | } | |
1420 | IDENTIFIER_GLOBAL_VALUE (id) = error_mark_node; | |
1421 | IDENTIFIER_ERROR_LOCUS (id) = current_function_decl; | |
1422 | } | |
1423 | return error_mark_node; | |
1424 | } | |
1425 | } | |
1426 | else | |
1427 | { | |
1428 | /* Properly declared variable or function reference. */ | |
1429 | if (!objc_ivar) | |
1430 | ref = decl; | |
1431 | else if (decl != objc_ivar && IDENTIFIER_LOCAL_VALUE (id)) | |
1432 | { | |
1433 | warning ("local declaration of `%s' hides instance variable", | |
1434 | IDENTIFIER_POINTER (id)); | |
1435 | ref = decl; | |
1436 | } | |
1437 | else | |
1438 | ref = objc_ivar; | |
1439 | } | |
1440 | ||
1441 | if (TREE_TYPE (ref) == error_mark_node) | |
1442 | return error_mark_node; | |
1443 | ||
25587e40 AO |
1444 | if (!skip_evaluation) |
1445 | assemble_external (ref); | |
7e585d16 ZW |
1446 | TREE_USED (ref) = 1; |
1447 | ||
1448 | if (TREE_CODE (ref) == CONST_DECL) | |
1449 | { | |
1450 | ref = DECL_INITIAL (ref); | |
1451 | TREE_CONSTANT (ref) = 1; | |
1452 | } | |
1453 | ||
1454 | return ref; | |
1455 | } | |
1456 | ||
400fbf9f JW |
1457 | /* Build a function call to function FUNCTION with parameters PARAMS. |
1458 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
1459 | TREE_VALUE of each node is a parameter-expression. | |
1460 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
1461 | ||
1462 | tree | |
1463 | build_function_call (function, params) | |
1464 | tree function, params; | |
1465 | { | |
b3694847 SS |
1466 | tree fntype, fundecl = 0; |
1467 | tree coerced_params; | |
1eb8759b | 1468 | tree name = NULL_TREE, assembler_name = NULL_TREE, result; |
400fbf9f | 1469 | |
fc76e425 | 1470 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 1471 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
1472 | |
1473 | /* Convert anything with function type to a pointer-to-function. */ | |
1474 | if (TREE_CODE (function) == FUNCTION_DECL) | |
1475 | { | |
1476 | name = DECL_NAME (function); | |
19d76e60 RK |
1477 | assembler_name = DECL_ASSEMBLER_NAME (function); |
1478 | ||
400fbf9f JW |
1479 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
1480 | (because calling an inline function does not mean the function | |
1481 | needs to be separately compiled). */ | |
1482 | fntype = build_type_variant (TREE_TYPE (function), | |
1483 | TREE_READONLY (function), | |
1484 | TREE_THIS_VOLATILE (function)); | |
9b7267b8 | 1485 | fundecl = function; |
400fbf9f JW |
1486 | function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); |
1487 | } | |
1488 | else | |
1489 | function = default_conversion (function); | |
1490 | ||
1491 | fntype = TREE_TYPE (function); | |
1492 | ||
1493 | if (TREE_CODE (fntype) == ERROR_MARK) | |
1494 | return error_mark_node; | |
1495 | ||
1496 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
1497 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
1498 | { | |
1499 | error ("called object is not a function"); | |
1500 | return error_mark_node; | |
1501 | } | |
1502 | ||
5ce89b2e JM |
1503 | if (fundecl && TREE_THIS_VOLATILE (fundecl)) |
1504 | current_function_returns_abnormally = 1; | |
1505 | ||
400fbf9f JW |
1506 | /* fntype now gets the type of function pointed to. */ |
1507 | fntype = TREE_TYPE (fntype); | |
1508 | ||
1509 | /* Convert the parameters to the types declared in the | |
1510 | function prototype, or apply default promotions. */ | |
1511 | ||
1512 | coerced_params | |
9b7267b8 | 1513 | = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl); |
400fbf9f | 1514 | |
b34c7881 | 1515 | /* Check that the arguments to the function are valid. */ |
400fbf9f | 1516 | |
b34c7881 | 1517 | check_function_arguments (TYPE_ATTRIBUTES (fntype), coerced_params); |
400fbf9f JW |
1518 | |
1519 | /* Recognize certain built-in functions so we can make tree-codes | |
1520 | other than CALL_EXPR. We do this when it enables fold-const.c | |
1521 | to do something useful. */ | |
1522 | ||
1523 | if (TREE_CODE (function) == ADDR_EXPR | |
1524 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
1eb8759b RH |
1525 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) |
1526 | { | |
1527 | result = expand_tree_builtin (TREE_OPERAND (function, 0), | |
1528 | params, coerced_params); | |
1529 | if (result) | |
1530 | return result; | |
1531 | } | |
400fbf9f | 1532 | |
1eb8759b RH |
1533 | result = build (CALL_EXPR, TREE_TYPE (fntype), |
1534 | function, coerced_params, NULL_TREE); | |
1eb8759b | 1535 | TREE_SIDE_EFFECTS (result) = 1; |
b0b3afb2 BS |
1536 | result = fold (result); |
1537 | ||
71653180 | 1538 | if (VOID_TYPE_P (TREE_TYPE (result))) |
1eb8759b RH |
1539 | return result; |
1540 | return require_complete_type (result); | |
400fbf9f JW |
1541 | } |
1542 | \f | |
1543 | /* Convert the argument expressions in the list VALUES | |
1544 | to the types in the list TYPELIST. The result is a list of converted | |
1545 | argument expressions. | |
1546 | ||
1547 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
1548 | perform the default conversions. | |
1549 | ||
1550 | PARMLIST is the chain of parm decls for the function being called. | |
1551 | It may be 0, if that info is not available. | |
1552 | It is used only for generating error messages. | |
1553 | ||
1554 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
1555 | ||
1556 | This is also where warnings about wrong number of args are generated. | |
1557 | ||
1558 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
1559 | with the elements of the list in the TREE_VALUE slots of those nodes. */ | |
1560 | ||
1561 | static tree | |
9b7267b8 RS |
1562 | convert_arguments (typelist, values, name, fundecl) |
1563 | tree typelist, values, name, fundecl; | |
400fbf9f | 1564 | { |
b3694847 SS |
1565 | tree typetail, valtail; |
1566 | tree result = NULL; | |
400fbf9f JW |
1567 | int parmnum; |
1568 | ||
1569 | /* Scan the given expressions and types, producing individual | |
1570 | converted arguments and pushing them on RESULT in reverse order. */ | |
1571 | ||
1572 | for (valtail = values, typetail = typelist, parmnum = 0; | |
1573 | valtail; | |
1574 | valtail = TREE_CHAIN (valtail), parmnum++) | |
1575 | { | |
b3694847 SS |
1576 | tree type = typetail ? TREE_VALUE (typetail) : 0; |
1577 | tree val = TREE_VALUE (valtail); | |
400fbf9f JW |
1578 | |
1579 | if (type == void_type_node) | |
1580 | { | |
1581 | if (name) | |
1582 | error ("too many arguments to function `%s'", | |
1583 | IDENTIFIER_POINTER (name)); | |
1584 | else | |
1585 | error ("too many arguments to function"); | |
1586 | break; | |
1587 | } | |
1588 | ||
1589 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
1590 | /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0 |
1591 | to convert automatically to a pointer. */ | |
400fbf9f JW |
1592 | if (TREE_CODE (val) == NON_LVALUE_EXPR) |
1593 | val = TREE_OPERAND (val, 0); | |
1594 | ||
207bf485 | 1595 | val = default_function_array_conversion (val); |
400fbf9f JW |
1596 | |
1597 | val = require_complete_type (val); | |
1598 | ||
1599 | if (type != 0) | |
1600 | { | |
1601 | /* Formal parm type is specified by a function prototype. */ | |
1602 | tree parmval; | |
1603 | ||
d0f062fb | 1604 | if (!COMPLETE_TYPE_P (type)) |
400fbf9f JW |
1605 | { |
1606 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
1607 | parmval = val; | |
1608 | } | |
1609 | else | |
1610 | { | |
d45cf215 RS |
1611 | /* Optionally warn about conversions that |
1612 | differ from the default conversions. */ | |
03829ad2 | 1613 | if (warn_conversion || warn_traditional) |
400fbf9f JW |
1614 | { |
1615 | int formal_prec = TYPE_PRECISION (type); | |
400fbf9f | 1616 | |
aae43c5f | 1617 | if (INTEGRAL_TYPE_P (type) |
400fbf9f | 1618 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) |
754a4d82 | 1619 | warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1); |
03829ad2 KG |
1620 | if (INTEGRAL_TYPE_P (type) |
1621 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
1622 | warn_for_assignment ("%s as integer rather than complex due to prototype", (char *) 0, name, parmnum + 1); | |
aae43c5f RK |
1623 | else if (TREE_CODE (type) == COMPLEX_TYPE |
1624 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
1625 | warn_for_assignment ("%s as complex rather than floating due to prototype", (char *) 0, name, parmnum + 1); | |
400fbf9f | 1626 | else if (TREE_CODE (type) == REAL_TYPE |
aae43c5f | 1627 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
754a4d82 | 1628 | warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1); |
03829ad2 KG |
1629 | else if (TREE_CODE (type) == COMPLEX_TYPE |
1630 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) | |
1631 | warn_for_assignment ("%s as complex rather than integer due to prototype", (char *) 0, name, parmnum + 1); | |
aae43c5f RK |
1632 | else if (TREE_CODE (type) == REAL_TYPE |
1633 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
1634 | warn_for_assignment ("%s as floating rather than complex due to prototype", (char *) 0, name, parmnum + 1); | |
1635 | /* ??? At some point, messages should be written about | |
1636 | conversions between complex types, but that's too messy | |
1637 | to do now. */ | |
d45cf215 RS |
1638 | else if (TREE_CODE (type) == REAL_TYPE |
1639 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
1640 | { | |
1641 | /* Warn if any argument is passed as `float', | |
047de90b | 1642 | since without a prototype it would be `double'. */ |
d45cf215 | 1643 | if (formal_prec == TYPE_PRECISION (float_type_node)) |
754a4d82 | 1644 | warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 | 1645 | } |
3ed56f8a KG |
1646 | /* Detect integer changing in width or signedness. |
1647 | These warnings are only activated with | |
1648 | -Wconversion, not with -Wtraditional. */ | |
1649 | else if (warn_conversion && INTEGRAL_TYPE_P (type) | |
aae43c5f | 1650 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
400fbf9f | 1651 | { |
d45cf215 RS |
1652 | tree would_have_been = default_conversion (val); |
1653 | tree type1 = TREE_TYPE (would_have_been); | |
1654 | ||
754a4d82 | 1655 | if (TREE_CODE (type) == ENUMERAL_TYPE |
a38b987a NB |
1656 | && (TYPE_MAIN_VARIANT (type) |
1657 | == TYPE_MAIN_VARIANT (TREE_TYPE (val)))) | |
754a4d82 RS |
1658 | /* No warning if function asks for enum |
1659 | and the actual arg is that enum type. */ | |
1660 | ; | |
1661 | else if (formal_prec != TYPE_PRECISION (type1)) | |
1662 | warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1); | |
d45cf215 RS |
1663 | else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1)) |
1664 | ; | |
800cd3b9 RS |
1665 | /* Don't complain if the formal parameter type |
1666 | is an enum, because we can't tell now whether | |
1667 | the value was an enum--even the same enum. */ | |
1668 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
1669 | ; | |
400fbf9f JW |
1670 | else if (TREE_CODE (val) == INTEGER_CST |
1671 | && int_fits_type_p (val, type)) | |
1672 | /* Change in signedness doesn't matter | |
1673 | if a constant value is unaffected. */ | |
1674 | ; | |
4bbbc5d9 RS |
1675 | /* Likewise for a constant in a NOP_EXPR. */ |
1676 | else if (TREE_CODE (val) == NOP_EXPR | |
1677 | && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST | |
1678 | && int_fits_type_p (TREE_OPERAND (val, 0), type)) | |
1679 | ; | |
1680 | #if 0 /* We never get such tree structure here. */ | |
047de90b RS |
1681 | else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE |
1682 | && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type) | |
1683 | && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type)) | |
1684 | /* Change in signedness doesn't matter | |
1685 | if an enum value is unaffected. */ | |
1686 | ; | |
4bbbc5d9 | 1687 | #endif |
ce9895ae RS |
1688 | /* If the value is extended from a narrower |
1689 | unsigned type, it doesn't matter whether we | |
1690 | pass it as signed or unsigned; the value | |
1691 | certainly is the same either way. */ | |
1692 | else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type) | |
1693 | && TREE_UNSIGNED (TREE_TYPE (val))) | |
1694 | ; | |
3ed56f8a KG |
1695 | else if (TREE_UNSIGNED (type)) |
1696 | warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1); | |
1697 | else | |
1698 | warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1); | |
400fbf9f JW |
1699 | } |
1700 | } | |
1701 | ||
1702 | parmval = convert_for_assignment (type, val, | |
0f41302f | 1703 | (char *) 0, /* arg passing */ |
9b7267b8 | 1704 | fundecl, name, parmnum + 1); |
400fbf9f | 1705 | |
7d473569 | 1706 | if (PROMOTE_PROTOTYPES |
b6d6aa84 | 1707 | && INTEGRAL_TYPE_P (type) |
400fbf9f JW |
1708 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) |
1709 | parmval = default_conversion (parmval); | |
400fbf9f | 1710 | } |
8d9bfdc5 | 1711 | result = tree_cons (NULL_TREE, parmval, result); |
400fbf9f JW |
1712 | } |
1713 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
1714 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
1715 | < TYPE_PRECISION (double_type_node))) | |
1716 | /* Convert `float' to `double'. */ | |
1717 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
1718 | else | |
1719 | /* Convert `short' and `char' to full-size `int'. */ | |
1720 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
1721 | ||
1722 | if (typetail) | |
1723 | typetail = TREE_CHAIN (typetail); | |
1724 | } | |
1725 | ||
1726 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) | |
1727 | { | |
1728 | if (name) | |
1729 | error ("too few arguments to function `%s'", | |
1730 | IDENTIFIER_POINTER (name)); | |
1731 | else | |
1732 | error ("too few arguments to function"); | |
1733 | } | |
1734 | ||
1735 | return nreverse (result); | |
1736 | } | |
1737 | \f | |
1738 | /* This is the entry point used by the parser | |
1739 | for binary operators in the input. | |
1740 | In addition to constructing the expression, | |
1741 | we check for operands that were written with other binary operators | |
1742 | in a way that is likely to confuse the user. */ | |
edc7c4ec | 1743 | |
400fbf9f JW |
1744 | tree |
1745 | parser_build_binary_op (code, arg1, arg2) | |
1746 | enum tree_code code; | |
1747 | tree arg1, arg2; | |
1748 | { | |
1749 | tree result = build_binary_op (code, arg1, arg2, 1); | |
1750 | ||
1751 | char class; | |
1752 | char class1 = TREE_CODE_CLASS (TREE_CODE (arg1)); | |
1753 | char class2 = TREE_CODE_CLASS (TREE_CODE (arg2)); | |
1754 | enum tree_code code1 = ERROR_MARK; | |
1755 | enum tree_code code2 = ERROR_MARK; | |
1756 | ||
58bf601b HPN |
1757 | if (TREE_CODE (result) == ERROR_MARK) |
1758 | return error_mark_node; | |
1759 | ||
686deecb | 1760 | if (IS_EXPR_CODE_CLASS (class1)) |
400fbf9f | 1761 | code1 = C_EXP_ORIGINAL_CODE (arg1); |
686deecb | 1762 | if (IS_EXPR_CODE_CLASS (class2)) |
400fbf9f JW |
1763 | code2 = C_EXP_ORIGINAL_CODE (arg2); |
1764 | ||
1765 | /* Check for cases such as x+y<<z which users are likely | |
1766 | to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE | |
1767 | is cleared to prevent these warnings. */ | |
1768 | if (warn_parentheses) | |
1769 | { | |
1770 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
1771 | { | |
1772 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1773 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1774 | warning ("suggest parentheses around + or - inside shift"); | |
1775 | } | |
1776 | ||
1777 | if (code == TRUTH_ORIF_EXPR) | |
1778 | { | |
1779 | if (code1 == TRUTH_ANDIF_EXPR | |
1780 | || code2 == TRUTH_ANDIF_EXPR) | |
1781 | warning ("suggest parentheses around && within ||"); | |
1782 | } | |
1783 | ||
1784 | if (code == BIT_IOR_EXPR) | |
1785 | { | |
1786 | if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR | |
1787 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1788 | || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR | |
1789 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1790 | warning ("suggest parentheses around arithmetic in operand of |"); | |
7e9d002a RK |
1791 | /* Check cases like x|y==z */ |
1792 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1793 | warning ("suggest parentheses around comparison in operand of |"); | |
400fbf9f JW |
1794 | } |
1795 | ||
1796 | if (code == BIT_XOR_EXPR) | |
1797 | { | |
1798 | if (code1 == BIT_AND_EXPR | |
1799 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1800 | || code2 == BIT_AND_EXPR | |
1801 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1802 | warning ("suggest parentheses around arithmetic in operand of ^"); | |
7e9d002a RK |
1803 | /* Check cases like x^y==z */ |
1804 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1805 | warning ("suggest parentheses around comparison in operand of ^"); | |
400fbf9f JW |
1806 | } |
1807 | ||
1808 | if (code == BIT_AND_EXPR) | |
1809 | { | |
1810 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1811 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1812 | warning ("suggest parentheses around + or - in operand of &"); | |
7e9d002a RK |
1813 | /* Check cases like x&y==z */ |
1814 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1815 | warning ("suggest parentheses around comparison in operand of &"); | |
400fbf9f JW |
1816 | } |
1817 | } | |
1818 | ||
001af587 | 1819 | /* Similarly, check for cases like 1<=i<=10 that are probably errors. */ |
edc7c4ec | 1820 | if (TREE_CODE_CLASS (code) == '<' && extra_warnings |
001af587 RS |
1821 | && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')) |
1822 | warning ("comparisons like X<=Y<=Z do not have their mathematical meaning"); | |
1823 | ||
e58cd767 RS |
1824 | unsigned_conversion_warning (result, arg1); |
1825 | unsigned_conversion_warning (result, arg2); | |
1826 | overflow_warning (result); | |
1827 | ||
edc7c4ec RS |
1828 | class = TREE_CODE_CLASS (TREE_CODE (result)); |
1829 | ||
400fbf9f JW |
1830 | /* Record the code that was specified in the source, |
1831 | for the sake of warnings about confusing nesting. */ | |
686deecb | 1832 | if (IS_EXPR_CODE_CLASS (class)) |
400fbf9f JW |
1833 | C_SET_EXP_ORIGINAL_CODE (result, code); |
1834 | else | |
1835 | { | |
1836 | int flag = TREE_CONSTANT (result); | |
d11fdb45 RS |
1837 | /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR |
1838 | so that convert_for_assignment wouldn't strip it. | |
1839 | That way, we got warnings for things like p = (1 - 1). | |
1840 | But it turns out we should not get those warnings. */ | |
1841 | result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result); | |
400fbf9f JW |
1842 | C_SET_EXP_ORIGINAL_CODE (result, code); |
1843 | TREE_CONSTANT (result) = flag; | |
1844 | } | |
1845 | ||
1846 | return result; | |
1847 | } | |
1848 | ||
1849 | /* Build a binary-operation expression without default conversions. | |
1850 | CODE is the kind of expression to build. | |
1851 | This function differs from `build' in several ways: | |
1852 | the data type of the result is computed and recorded in it, | |
1853 | warnings are generated if arg data types are invalid, | |
1854 | special handling for addition and subtraction of pointers is known, | |
1855 | and some optimization is done (operations on narrow ints | |
1856 | are done in the narrower type when that gives the same result). | |
1857 | Constant folding is also done before the result is returned. | |
1858 | ||
1859 | Note that the operands will never have enumeral types, or function | |
1860 | or array types, because either they will have the default conversions | |
1861 | performed or they have both just been converted to some other type in which | |
1862 | the arithmetic is to be done. */ | |
1863 | ||
1864 | tree | |
1865 | build_binary_op (code, orig_op0, orig_op1, convert_p) | |
1866 | enum tree_code code; | |
1867 | tree orig_op0, orig_op1; | |
1868 | int convert_p; | |
1869 | { | |
1870 | tree type0, type1; | |
b3694847 | 1871 | enum tree_code code0, code1; |
400fbf9f JW |
1872 | tree op0, op1; |
1873 | ||
1874 | /* Expression code to give to the expression when it is built. | |
1875 | Normally this is CODE, which is what the caller asked for, | |
1876 | but in some special cases we change it. */ | |
b3694847 | 1877 | enum tree_code resultcode = code; |
400fbf9f JW |
1878 | |
1879 | /* Data type in which the computation is to be performed. | |
1880 | In the simplest cases this is the common type of the arguments. */ | |
b3694847 | 1881 | tree result_type = NULL; |
400fbf9f JW |
1882 | |
1883 | /* Nonzero means operands have already been type-converted | |
1884 | in whatever way is necessary. | |
1885 | Zero means they need to be converted to RESULT_TYPE. */ | |
1886 | int converted = 0; | |
1887 | ||
293c9fdd JM |
1888 | /* Nonzero means create the expression with this type, rather than |
1889 | RESULT_TYPE. */ | |
1890 | tree build_type = 0; | |
1891 | ||
400fbf9f | 1892 | /* Nonzero means after finally constructing the expression |
293c9fdd | 1893 | convert it to this type. */ |
400fbf9f JW |
1894 | tree final_type = 0; |
1895 | ||
1896 | /* Nonzero if this is an operation like MIN or MAX which can | |
1897 | safely be computed in short if both args are promoted shorts. | |
1898 | Also implies COMMON. | |
1899 | -1 indicates a bitwise operation; this makes a difference | |
1900 | in the exact conditions for when it is safe to do the operation | |
1901 | in a narrower mode. */ | |
1902 | int shorten = 0; | |
1903 | ||
1904 | /* Nonzero if this is a comparison operation; | |
1905 | if both args are promoted shorts, compare the original shorts. | |
1906 | Also implies COMMON. */ | |
1907 | int short_compare = 0; | |
1908 | ||
1909 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
1910 | original short and then promoted if the operand is a promoted short. */ | |
1911 | int short_shift = 0; | |
1912 | ||
1913 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
1914 | int common = 0; | |
1915 | ||
1916 | if (convert_p) | |
1917 | { | |
1918 | op0 = default_conversion (orig_op0); | |
1919 | op1 = default_conversion (orig_op1); | |
1920 | } | |
1921 | else | |
1922 | { | |
1923 | op0 = orig_op0; | |
1924 | op1 = orig_op1; | |
1925 | } | |
1926 | ||
1927 | type0 = TREE_TYPE (op0); | |
1928 | type1 = TREE_TYPE (op1); | |
1929 | ||
1930 | /* The expression codes of the data types of the arguments tell us | |
1931 | whether the arguments are integers, floating, pointers, etc. */ | |
1932 | code0 = TREE_CODE (type0); | |
1933 | code1 = TREE_CODE (type1); | |
1934 | ||
fc76e425 | 1935 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce RS |
1936 | STRIP_TYPE_NOPS (op0); |
1937 | STRIP_TYPE_NOPS (op1); | |
400fbf9f JW |
1938 | |
1939 | /* If an error was already reported for one of the arguments, | |
1940 | avoid reporting another error. */ | |
1941 | ||
1942 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
1943 | return error_mark_node; | |
1944 | ||
1945 | switch (code) | |
1946 | { | |
1947 | case PLUS_EXPR: | |
1948 | /* Handle the pointer + int case. */ | |
1949 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
1950 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
1951 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
1952 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
1953 | else | |
1954 | common = 1; | |
1955 | break; | |
1956 | ||
1957 | case MINUS_EXPR: | |
1958 | /* Subtraction of two similar pointers. | |
1959 | We must subtract them as integers, then divide by object size. */ | |
1960 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
1961 | && comp_target_types (type0, type1)) | |
1962 | return pointer_diff (op0, op1); | |
1963 | /* Handle pointer minus int. Just like pointer plus int. */ | |
1964 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
1965 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
1966 | else | |
1967 | common = 1; | |
1968 | break; | |
1969 | ||
1970 | case MULT_EXPR: | |
1971 | common = 1; | |
1972 | break; | |
1973 | ||
1974 | case TRUNC_DIV_EXPR: | |
1975 | case CEIL_DIV_EXPR: | |
1976 | case FLOOR_DIV_EXPR: | |
1977 | case ROUND_DIV_EXPR: | |
1978 | case EXACT_DIV_EXPR: | |
6c36d76b NB |
1979 | /* Floating point division by zero is a legitimate way to obtain |
1980 | infinities and NaNs. */ | |
1981 | if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1)) | |
1982 | warning ("division by zero"); | |
1983 | ||
b6a10c9f | 1984 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
cb2a532e | 1985 | || code0 == COMPLEX_TYPE || code0 == VECTOR_TYPE) |
b6a10c9f | 1986 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
cb2a532e | 1987 | || code1 == COMPLEX_TYPE || code1 == VECTOR_TYPE)) |
400fbf9f JW |
1988 | { |
1989 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) | |
1990 | resultcode = RDIV_EXPR; | |
1991 | else | |
05bccae2 RK |
1992 | /* Although it would be tempting to shorten always here, that |
1993 | loses on some targets, since the modulo instruction is | |
1994 | undefined if the quotient can't be represented in the | |
1995 | computation mode. We shorten only if unsigned or if | |
1996 | dividing by something we know != -1. */ | |
1997 | shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0)) | |
1998 | || (TREE_CODE (op1) == INTEGER_CST | |
1999 | && ! integer_all_onesp (op1))); | |
400fbf9f JW |
2000 | common = 1; |
2001 | } | |
2002 | break; | |
2003 | ||
2004 | case BIT_AND_EXPR: | |
2005 | case BIT_ANDTC_EXPR: | |
2006 | case BIT_IOR_EXPR: | |
2007 | case BIT_XOR_EXPR: | |
2008 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2009 | shorten = -1; | |
34a80643 R |
2010 | else if (code0 == VECTOR_TYPE && code1 == VECTOR_TYPE) |
2011 | common = 1; | |
400fbf9f JW |
2012 | break; |
2013 | ||
2014 | case TRUNC_MOD_EXPR: | |
047de90b | 2015 | case FLOOR_MOD_EXPR: |
6c36d76b NB |
2016 | if (warn_div_by_zero && skip_evaluation == 0 && integer_zerop (op1)) |
2017 | warning ("division by zero"); | |
2018 | ||
400fbf9f | 2019 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
03d5b1f5 RS |
2020 | { |
2021 | /* Although it would be tempting to shorten always here, that loses | |
2022 | on some targets, since the modulo instruction is undefined if the | |
2023 | quotient can't be represented in the computation mode. We shorten | |
2024 | only if unsigned or if dividing by something we know != -1. */ | |
96d8f1d8 | 2025 | shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0)) |
03d5b1f5 | 2026 | || (TREE_CODE (op1) == INTEGER_CST |
05bccae2 | 2027 | && ! integer_all_onesp (op1))); |
03d5b1f5 RS |
2028 | common = 1; |
2029 | } | |
400fbf9f JW |
2030 | break; |
2031 | ||
2032 | case TRUTH_ANDIF_EXPR: | |
2033 | case TRUTH_ORIF_EXPR: | |
2034 | case TRUTH_AND_EXPR: | |
2035 | case TRUTH_OR_EXPR: | |
1eca8b1e | 2036 | case TRUTH_XOR_EXPR: |
b6a10c9f RS |
2037 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE |
2038 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) | |
2039 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE | |
2040 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2041 | { |
2042 | /* Result of these operations is always an int, | |
2043 | but that does not mean the operands should be | |
2044 | converted to ints! */ | |
2045 | result_type = integer_type_node; | |
78ef5b89 NB |
2046 | op0 = c_common_truthvalue_conversion (op0); |
2047 | op1 = c_common_truthvalue_conversion (op1); | |
400fbf9f JW |
2048 | converted = 1; |
2049 | } | |
2050 | break; | |
2051 | ||
2052 | /* Shift operations: result has same type as first operand; | |
2053 | always convert second operand to int. | |
2054 | Also set SHORT_SHIFT if shifting rightward. */ | |
2055 | ||
2056 | case RSHIFT_EXPR: | |
2057 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2058 | { | |
47ee6837 | 2059 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
400fbf9f | 2060 | { |
ff3225e7 | 2061 | if (tree_int_cst_sgn (op1) < 0) |
315da535 | 2062 | warning ("right shift count is negative"); |
17651386 RS |
2063 | else |
2064 | { | |
05bccae2 | 2065 | if (! integer_zerop (op1)) |
17651386 | 2066 | short_shift = 1; |
05bccae2 RK |
2067 | |
2068 | if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) | |
315da535 | 2069 | warning ("right shift count >= width of type"); |
17651386 | 2070 | } |
400fbf9f | 2071 | } |
05bccae2 | 2072 | |
f458d1d5 | 2073 | /* Use the type of the value to be shifted. */ |
d45cf215 | 2074 | result_type = type0; |
f458d1d5 ZW |
2075 | /* Convert the shift-count to an integer, regardless of size |
2076 | of value being shifted. */ | |
2077 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
2078 | op1 = convert (integer_type_node, op1); | |
2079 | /* Avoid converting op1 to result_type later. */ | |
2080 | converted = 1; | |
400fbf9f JW |
2081 | } |
2082 | break; | |
2083 | ||
2084 | case LSHIFT_EXPR: | |
2085 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2086 | { | |
47ee6837 | 2087 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
17651386 | 2088 | { |
ff3225e7 | 2089 | if (tree_int_cst_sgn (op1) < 0) |
315da535 | 2090 | warning ("left shift count is negative"); |
05bccae2 RK |
2091 | |
2092 | else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) | |
315da535 | 2093 | warning ("left shift count >= width of type"); |
17651386 | 2094 | } |
05bccae2 | 2095 | |
f458d1d5 | 2096 | /* Use the type of the value to be shifted. */ |
d45cf215 | 2097 | result_type = type0; |
f458d1d5 ZW |
2098 | /* Convert the shift-count to an integer, regardless of size |
2099 | of value being shifted. */ | |
2100 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
2101 | op1 = convert (integer_type_node, op1); | |
2102 | /* Avoid converting op1 to result_type later. */ | |
2103 | converted = 1; | |
400fbf9f JW |
2104 | } |
2105 | break; | |
2106 | ||
2107 | case RROTATE_EXPR: | |
2108 | case LROTATE_EXPR: | |
2109 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2110 | { | |
47ee6837 | 2111 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
17651386 | 2112 | { |
ff3225e7 | 2113 | if (tree_int_cst_sgn (op1) < 0) |
17651386 | 2114 | warning ("shift count is negative"); |
05bccae2 | 2115 | else if (compare_tree_int (op1, TYPE_PRECISION (type0)) >= 0) |
17651386 RS |
2116 | warning ("shift count >= width of type"); |
2117 | } | |
05bccae2 | 2118 | |
f458d1d5 | 2119 | /* Use the type of the value to be shifted. */ |
d45cf215 | 2120 | result_type = type0; |
f458d1d5 ZW |
2121 | /* Convert the shift-count to an integer, regardless of size |
2122 | of value being shifted. */ | |
2123 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
2124 | op1 = convert (integer_type_node, op1); | |
2125 | /* Avoid converting op1 to result_type later. */ | |
2126 | converted = 1; | |
400fbf9f JW |
2127 | } |
2128 | break; | |
2129 | ||
2130 | case EQ_EXPR: | |
2131 | case NE_EXPR: | |
b843d210 DZ |
2132 | if (warn_float_equal && (code0 == REAL_TYPE || code1 == REAL_TYPE)) |
2133 | warning ("comparing floating point with == or != is unsafe"); | |
400fbf9f JW |
2134 | /* Result of comparison is always int, |
2135 | but don't convert the args to int! */ | |
293c9fdd | 2136 | build_type = integer_type_node; |
b6a10c9f | 2137 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
cb2a532e AH |
2138 | || code0 == COMPLEX_TYPE |
2139 | || code0 == VECTOR_TYPE) | |
b6a10c9f | 2140 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE |
cb2a532e AH |
2141 | || code1 == COMPLEX_TYPE |
2142 | || code1 == VECTOR_TYPE)) | |
400fbf9f JW |
2143 | short_compare = 1; |
2144 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2145 | { | |
b3694847 SS |
2146 | tree tt0 = TREE_TYPE (type0); |
2147 | tree tt1 = TREE_TYPE (type1); | |
400fbf9f | 2148 | /* Anything compares with void *. void * compares with anything. |
d11fdb45 RS |
2149 | Otherwise, the targets must be compatible |
2150 | and both must be object or both incomplete. */ | |
400fbf9f | 2151 | if (comp_target_types (type0, type1)) |
605a99f6 | 2152 | result_type = common_type (type0, type1); |
71653180 | 2153 | else if (VOID_TYPE_P (tt0)) |
400fbf9f | 2154 | { |
fd5d5b94 RS |
2155 | /* op0 != orig_op0 detects the case of something |
2156 | whose value is 0 but which isn't a valid null ptr const. */ | |
2157 | if (pedantic && (!integer_zerop (op0) || op0 != orig_op0) | |
400fbf9f | 2158 | && TREE_CODE (tt1) == FUNCTION_TYPE) |
89abf8d1 | 2159 | pedwarn ("ISO C forbids comparison of `void *' with function pointer"); |
400fbf9f | 2160 | } |
71653180 | 2161 | else if (VOID_TYPE_P (tt1)) |
400fbf9f | 2162 | { |
fd5d5b94 | 2163 | if (pedantic && (!integer_zerop (op1) || op1 != orig_op1) |
400fbf9f | 2164 | && TREE_CODE (tt0) == FUNCTION_TYPE) |
89abf8d1 | 2165 | pedwarn ("ISO C forbids comparison of `void *' with function pointer"); |
400fbf9f JW |
2166 | } |
2167 | else | |
2168 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
605a99f6 JM |
2169 | |
2170 | if (result_type == NULL_TREE) | |
2171 | result_type = ptr_type_node; | |
400fbf9f JW |
2172 | } |
2173 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2174 | && integer_zerop (op1)) | |
293c9fdd | 2175 | result_type = type0; |
400fbf9f JW |
2176 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
2177 | && integer_zerop (op0)) | |
293c9fdd | 2178 | result_type = type1; |
400fbf9f JW |
2179 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
2180 | { | |
293c9fdd | 2181 | result_type = type0; |
f458d1d5 | 2182 | pedwarn ("comparison between pointer and integer"); |
400fbf9f JW |
2183 | } |
2184 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2185 | { | |
293c9fdd | 2186 | result_type = type1; |
f458d1d5 | 2187 | pedwarn ("comparison between pointer and integer"); |
400fbf9f | 2188 | } |
400fbf9f JW |
2189 | break; |
2190 | ||
2191 | case MAX_EXPR: | |
2192 | case MIN_EXPR: | |
9db931af RS |
2193 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
2194 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
400fbf9f JW |
2195 | shorten = 1; |
2196 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2197 | { | |
605a99f6 JM |
2198 | if (comp_target_types (type0, type1)) |
2199 | { | |
2200 | result_type = common_type (type0, type1); | |
2201 | if (pedantic | |
2202 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
89abf8d1 | 2203 | pedwarn ("ISO C forbids ordered comparisons of pointers to functions"); |
605a99f6 JM |
2204 | } |
2205 | else | |
2206 | { | |
2207 | result_type = ptr_type_node; | |
2208 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2209 | } | |
400fbf9f JW |
2210 | } |
2211 | break; | |
2212 | ||
2213 | case LE_EXPR: | |
2214 | case GE_EXPR: | |
2215 | case LT_EXPR: | |
2216 | case GT_EXPR: | |
293c9fdd | 2217 | build_type = integer_type_node; |
9db931af RS |
2218 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
2219 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
400fbf9f JW |
2220 | short_compare = 1; |
2221 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2222 | { | |
605a99f6 JM |
2223 | if (comp_target_types (type0, type1)) |
2224 | { | |
2225 | result_type = common_type (type0, type1); | |
d0f062fb NS |
2226 | if (!COMPLETE_TYPE_P (TREE_TYPE (type0)) |
2227 | != !COMPLETE_TYPE_P (TREE_TYPE (type1))) | |
605a99f6 JM |
2228 | pedwarn ("comparison of complete and incomplete pointers"); |
2229 | else if (pedantic | |
2230 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
89abf8d1 | 2231 | pedwarn ("ISO C forbids ordered comparisons of pointers to functions"); |
605a99f6 JM |
2232 | } |
2233 | else | |
2234 | { | |
2235 | result_type = ptr_type_node; | |
2236 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2237 | } | |
400fbf9f JW |
2238 | } |
2239 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2240 | && integer_zerop (op1)) | |
2241 | { | |
293c9fdd | 2242 | result_type = type0; |
ddcf4abc | 2243 | if (pedantic || extra_warnings) |
400fbf9f JW |
2244 | pedwarn ("ordered comparison of pointer with integer zero"); |
2245 | } | |
2246 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2247 | && integer_zerop (op0)) | |
2248 | { | |
293c9fdd | 2249 | result_type = type1; |
400fbf9f JW |
2250 | if (pedantic) |
2251 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2252 | } | |
2253 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2254 | { | |
293c9fdd | 2255 | result_type = type0; |
f458d1d5 | 2256 | pedwarn ("comparison between pointer and integer"); |
400fbf9f JW |
2257 | } |
2258 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2259 | { | |
293c9fdd | 2260 | result_type = type1; |
f458d1d5 | 2261 | pedwarn ("comparison between pointer and integer"); |
400fbf9f | 2262 | } |
400fbf9f | 2263 | break; |
1eb8759b RH |
2264 | |
2265 | case UNORDERED_EXPR: | |
2266 | case ORDERED_EXPR: | |
2267 | case UNLT_EXPR: | |
2268 | case UNLE_EXPR: | |
2269 | case UNGT_EXPR: | |
2270 | case UNGE_EXPR: | |
2271 | case UNEQ_EXPR: | |
1eb8759b RH |
2272 | build_type = integer_type_node; |
2273 | if (code0 != REAL_TYPE || code1 != REAL_TYPE) | |
2274 | { | |
2275 | error ("unordered comparison on non-floating point argument"); | |
2276 | return error_mark_node; | |
2277 | } | |
2278 | common = 1; | |
2279 | break; | |
2280 | ||
e9a25f70 JL |
2281 | default: |
2282 | break; | |
400fbf9f JW |
2283 | } |
2284 | ||
cb2a532e AH |
2285 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE |
2286 | || code0 == VECTOR_TYPE) | |
b6a10c9f | 2287 | && |
cb2a532e AH |
2288 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE |
2289 | || code1 == VECTOR_TYPE)) | |
400fbf9f | 2290 | { |
b6a10c9f RS |
2291 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
2292 | ||
400fbf9f JW |
2293 | if (shorten || common || short_compare) |
2294 | result_type = common_type (type0, type1); | |
2295 | ||
2296 | /* For certain operations (which identify themselves by shorten != 0) | |
2297 | if both args were extended from the same smaller type, | |
2298 | do the arithmetic in that type and then extend. | |
2299 | ||
2300 | shorten !=0 and !=1 indicates a bitwise operation. | |
2301 | For them, this optimization is safe only if | |
2302 | both args are zero-extended or both are sign-extended. | |
2303 | Otherwise, we might change the result. | |
2304 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
2305 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
2306 | ||
b6a10c9f | 2307 | if (shorten && none_complex) |
400fbf9f JW |
2308 | { |
2309 | int unsigned0, unsigned1; | |
2310 | tree arg0 = get_narrower (op0, &unsigned0); | |
2311 | tree arg1 = get_narrower (op1, &unsigned1); | |
2312 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
2313 | int uns = TREE_UNSIGNED (result_type); | |
2314 | tree type; | |
2315 | ||
2316 | final_type = result_type; | |
2317 | ||
e7951b3f | 2318 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
400fbf9f JW |
2319 | but it *requires* conversion to FINAL_TYPE. */ |
2320 | ||
e7951b3f RS |
2321 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
2322 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2323 | && TREE_TYPE (op0) != final_type) | |
400fbf9f | 2324 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); |
e7951b3f RS |
2325 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
2326 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
2327 | && TREE_TYPE (op1) != final_type) | |
400fbf9f JW |
2328 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); |
2329 | ||
2330 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
2331 | ||
2332 | /* For bitwise operations, signedness of nominal type | |
2333 | does not matter. Consider only how operands were extended. */ | |
2334 | if (shorten == -1) | |
2335 | uns = unsigned0; | |
2336 | ||
2337 | /* Note that in all three cases below we refrain from optimizing | |
2338 | an unsigned operation on sign-extended args. | |
2339 | That would not be valid. */ | |
2340 | ||
2341 | /* Both args variable: if both extended in same way | |
2342 | from same width, do it in that width. | |
2343 | Do it unsigned if args were zero-extended. */ | |
2344 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
2345 | < TYPE_PRECISION (result_type)) | |
2346 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2347 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2348 | && unsigned0 == unsigned1 | |
2349 | && (unsigned0 || !uns)) | |
2350 | result_type | |
ceef8ce4 NB |
2351 | = c_common_signed_or_unsigned_type |
2352 | (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
400fbf9f JW |
2353 | else if (TREE_CODE (arg0) == INTEGER_CST |
2354 | && (unsigned1 || !uns) | |
2355 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2356 | < TYPE_PRECISION (result_type)) | |
ceef8ce4 NB |
2357 | && (type |
2358 | = c_common_signed_or_unsigned_type (unsigned1, | |
2359 | TREE_TYPE (arg1)), | |
400fbf9f JW |
2360 | int_fits_type_p (arg0, type))) |
2361 | result_type = type; | |
2362 | else if (TREE_CODE (arg1) == INTEGER_CST | |
2363 | && (unsigned0 || !uns) | |
2364 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
2365 | < TYPE_PRECISION (result_type)) | |
ceef8ce4 NB |
2366 | && (type |
2367 | = c_common_signed_or_unsigned_type (unsigned0, | |
2368 | TREE_TYPE (arg0)), | |
400fbf9f JW |
2369 | int_fits_type_p (arg1, type))) |
2370 | result_type = type; | |
2371 | } | |
2372 | ||
2373 | /* Shifts can be shortened if shifting right. */ | |
2374 | ||
2375 | if (short_shift) | |
2376 | { | |
2377 | int unsigned_arg; | |
2378 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
2379 | ||
2380 | final_type = result_type; | |
2381 | ||
2382 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
2383 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
2384 | ||
2385 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
6cb70f0c JW |
2386 | /* We can shorten only if the shift count is less than the |
2387 | number of bits in the smaller type size. */ | |
05bccae2 | 2388 | && compare_tree_int (op1, TYPE_PRECISION (TREE_TYPE (arg0))) < 0 |
91a18fe0 RH |
2389 | /* We cannot drop an unsigned shift after sign-extension. */ |
2390 | && (!TREE_UNSIGNED (final_type) || unsigned_arg)) | |
400fbf9f JW |
2391 | { |
2392 | /* Do an unsigned shift if the operand was zero-extended. */ | |
2393 | result_type | |
ceef8ce4 NB |
2394 | = c_common_signed_or_unsigned_type (unsigned_arg, |
2395 | TREE_TYPE (arg0)); | |
400fbf9f JW |
2396 | /* Convert value-to-be-shifted to that type. */ |
2397 | if (TREE_TYPE (op0) != result_type) | |
2398 | op0 = convert (result_type, op0); | |
2399 | converted = 1; | |
2400 | } | |
2401 | } | |
2402 | ||
2403 | /* Comparison operations are shortened too but differently. | |
2404 | They identify themselves by setting short_compare = 1. */ | |
2405 | ||
75326e8c | 2406 | if (short_compare) |
400fbf9f JW |
2407 | { |
2408 | /* Don't write &op0, etc., because that would prevent op0 | |
2409 | from being kept in a register. | |
2410 | Instead, make copies of the our local variables and | |
2411 | pass the copies by reference, then copy them back afterward. */ | |
2412 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
2413 | enum tree_code xresultcode = resultcode; | |
2414 | tree val | |
2415 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
665f2503 | 2416 | |
400fbf9f JW |
2417 | if (val != 0) |
2418 | return val; | |
665f2503 | 2419 | |
293c9fdd JM |
2420 | op0 = xop0, op1 = xop1; |
2421 | converted = 1; | |
400fbf9f JW |
2422 | resultcode = xresultcode; |
2423 | ||
407cb092 PE |
2424 | if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare != 0) |
2425 | && skip_evaluation == 0) | |
400fbf9f | 2426 | { |
d2d7ed3e JM |
2427 | int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); |
2428 | int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
64c01f80 DE |
2429 | int unsignedp0, unsignedp1; |
2430 | tree primop0 = get_narrower (op0, &unsignedp0); | |
2431 | tree primop1 = get_narrower (op1, &unsignedp1); | |
2432 | ||
912b4fc3 JM |
2433 | xop0 = orig_op0; |
2434 | xop1 = orig_op1; | |
2435 | STRIP_TYPE_NOPS (xop0); | |
2436 | STRIP_TYPE_NOPS (xop1); | |
2437 | ||
400fbf9f | 2438 | /* Give warnings for comparisons between signed and unsigned |
665f2503 | 2439 | quantities that may fail. |
293c9fdd | 2440 | |
665f2503 RK |
2441 | Do the checking based on the original operand trees, so that |
2442 | casts will be considered, but default promotions won't be. | |
2443 | ||
2444 | Do not warn if the comparison is being done in a signed type, | |
293c9fdd JM |
2445 | since the signed type will only be chosen if it can represent |
2446 | all the values of the unsigned type. */ | |
2447 | if (! TREE_UNSIGNED (result_type)) | |
2448 | /* OK */; | |
cb3ca04e | 2449 | /* Do not warn if both operands are the same signedness. */ |
2e14370e JM |
2450 | else if (op0_signed == op1_signed) |
2451 | /* OK */; | |
293c9fdd | 2452 | else |
cb3ca04e ZW |
2453 | { |
2454 | tree sop, uop; | |
665f2503 | 2455 | |
cb3ca04e ZW |
2456 | if (op0_signed) |
2457 | sop = xop0, uop = xop1; | |
2458 | else | |
2459 | sop = xop1, uop = xop0; | |
2460 | ||
3facde26 KG |
2461 | /* Do not warn if the signed quantity is an |
2462 | unsuffixed integer literal (or some static | |
2463 | constant expression involving such literals or a | |
2464 | conditional expression involving such literals) | |
2465 | and it is non-negative. */ | |
2466 | if (tree_expr_nonnegative_p (sop)) | |
cb3ca04e ZW |
2467 | /* OK */; |
2468 | /* Do not warn if the comparison is an equality operation, | |
2469 | the unsigned quantity is an integral constant, and it | |
2470 | would fit in the result if the result were signed. */ | |
2471 | else if (TREE_CODE (uop) == INTEGER_CST | |
2472 | && (resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
ceef8ce4 NB |
2473 | && int_fits_type_p |
2474 | (uop, c_common_signed_type (result_type))) | |
cb3ca04e ZW |
2475 | /* OK */; |
2476 | /* Do not warn if the unsigned quantity is an enumeration | |
2477 | constant and its maximum value would fit in the result | |
2478 | if the result were signed. */ | |
2479 | else if (TREE_CODE (uop) == INTEGER_CST | |
2480 | && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE | |
ceef8ce4 NB |
2481 | && int_fits_type_p |
2482 | (TYPE_MAX_VALUE (TREE_TYPE(uop)), | |
2483 | c_common_signed_type (result_type))) | |
cb3ca04e ZW |
2484 | /* OK */; |
2485 | else | |
2486 | warning ("comparison between signed and unsigned"); | |
2487 | } | |
64c01f80 DE |
2488 | |
2489 | /* Warn if two unsigned values are being compared in a size | |
2490 | larger than their original size, and one (and only one) is the | |
2491 | result of a `~' operator. This comparison will always fail. | |
2492 | ||
2493 | Also warn if one operand is a constant, and the constant | |
2494 | does not have all bits set that are set in the ~ operand | |
2495 | when it is extended. */ | |
2496 | ||
2497 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) | |
2498 | != (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
2499 | { | |
2500 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
2501 | primop0 = get_narrower (TREE_OPERAND (primop0, 0), | |
2502 | &unsignedp0); | |
2503 | else | |
2504 | primop1 = get_narrower (TREE_OPERAND (primop1, 0), | |
2505 | &unsignedp1); | |
2506 | ||
665f2503 | 2507 | if (host_integerp (primop0, 0) || host_integerp (primop1, 0)) |
64c01f80 DE |
2508 | { |
2509 | tree primop; | |
05bccae2 | 2510 | HOST_WIDE_INT constant, mask; |
64c01f80 DE |
2511 | int unsignedp, bits; |
2512 | ||
665f2503 | 2513 | if (host_integerp (primop0, 0)) |
64c01f80 DE |
2514 | { |
2515 | primop = primop1; | |
2516 | unsignedp = unsignedp1; | |
665f2503 | 2517 | constant = tree_low_cst (primop0, 0); |
64c01f80 DE |
2518 | } |
2519 | else | |
2520 | { | |
2521 | primop = primop0; | |
2522 | unsignedp = unsignedp0; | |
665f2503 | 2523 | constant = tree_low_cst (primop1, 0); |
64c01f80 DE |
2524 | } |
2525 | ||
2526 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
2527 | if (bits < TYPE_PRECISION (result_type) | |
05bccae2 | 2528 | && bits < HOST_BITS_PER_WIDE_INT && unsignedp) |
64c01f80 | 2529 | { |
05bccae2 | 2530 | mask = (~ (HOST_WIDE_INT) 0) << bits; |
64c01f80 DE |
2531 | if ((mask & constant) != mask) |
2532 | warning ("comparison of promoted ~unsigned with constant"); | |
2533 | } | |
2534 | } | |
2535 | else if (unsignedp0 && unsignedp1 | |
2536 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
2537 | < TYPE_PRECISION (result_type)) | |
2538 | && (TYPE_PRECISION (TREE_TYPE (primop1)) | |
2539 | < TYPE_PRECISION (result_type))) | |
2540 | warning ("comparison of promoted ~unsigned with unsigned"); | |
2541 | } | |
400fbf9f JW |
2542 | } |
2543 | } | |
2544 | } | |
2545 | ||
2546 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
2547 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
2548 | Then the expression will be built. | |
2549 | It will be given type FINAL_TYPE if that is nonzero; | |
2550 | otherwise, it will be given type RESULT_TYPE. */ | |
2551 | ||
2552 | if (!result_type) | |
2553 | { | |
2554 | binary_op_error (code); | |
2555 | return error_mark_node; | |
2556 | } | |
2557 | ||
2558 | if (! converted) | |
2559 | { | |
2560 | if (TREE_TYPE (op0) != result_type) | |
2561 | op0 = convert (result_type, op0); | |
2562 | if (TREE_TYPE (op1) != result_type) | |
2563 | op1 = convert (result_type, op1); | |
2564 | } | |
2565 | ||
293c9fdd JM |
2566 | if (build_type == NULL_TREE) |
2567 | build_type = result_type; | |
2568 | ||
400fbf9f | 2569 | { |
b3694847 SS |
2570 | tree result = build (resultcode, build_type, op0, op1); |
2571 | tree folded; | |
400fbf9f JW |
2572 | |
2573 | folded = fold (result); | |
2574 | if (folded == result) | |
2575 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2576 | if (final_type != 0) | |
2577 | return convert (final_type, folded); | |
2578 | return folded; | |
2579 | } | |
2580 | } | |
2581 | \f | |
400fbf9f JW |
2582 | /* Return a tree for the difference of pointers OP0 and OP1. |
2583 | The resulting tree has type int. */ | |
2584 | ||
2585 | static tree | |
2586 | pointer_diff (op0, op1) | |
b3694847 | 2587 | tree op0, op1; |
400fbf9f | 2588 | { |
b3694847 | 2589 | tree result, folded; |
400fbf9f JW |
2590 | tree restype = ptrdiff_type_node; |
2591 | ||
2592 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
95602da1 R |
2593 | tree con0, con1, lit0, lit1; |
2594 | tree orig_op1 = op1; | |
400fbf9f JW |
2595 | |
2596 | if (pedantic || warn_pointer_arith) | |
2597 | { | |
2598 | if (TREE_CODE (target_type) == VOID_TYPE) | |
2599 | pedwarn ("pointer of type `void *' used in subtraction"); | |
2600 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
2601 | pedwarn ("pointer to a function used in subtraction"); | |
2602 | } | |
2603 | ||
95602da1 R |
2604 | /* If the conversion to ptrdiff_type does anything like widening or |
2605 | converting a partial to an integral mode, we get a convert_expression | |
2606 | that is in the way to do any simplifications. | |
2607 | (fold-const.c doesn't know that the extra bits won't be needed. | |
2608 | split_tree uses STRIP_SIGN_NOPS, which leaves conversions to a | |
2609 | different mode in place.) | |
2610 | So first try to find a common term here 'by hand'; we want to cover | |
2611 | at least the cases that occur in legal static initializers. */ | |
2612 | con0 = TREE_CODE (op0) == NOP_EXPR ? TREE_OPERAND (op0, 0) : op0; | |
2613 | con1 = TREE_CODE (op1) == NOP_EXPR ? TREE_OPERAND (op1, 0) : op1; | |
2614 | ||
2615 | if (TREE_CODE (con0) == PLUS_EXPR) | |
2616 | { | |
2617 | lit0 = TREE_OPERAND (con0, 1); | |
2618 | con0 = TREE_OPERAND (con0, 0); | |
2619 | } | |
2620 | else | |
2621 | lit0 = integer_zero_node; | |
2622 | ||
2623 | if (TREE_CODE (con1) == PLUS_EXPR) | |
2624 | { | |
2625 | lit1 = TREE_OPERAND (con1, 1); | |
2626 | con1 = TREE_OPERAND (con1, 0); | |
2627 | } | |
2628 | else | |
2629 | lit1 = integer_zero_node; | |
2630 | ||
2631 | if (operand_equal_p (con0, con1, 0)) | |
2632 | { | |
2633 | op0 = lit0; | |
2634 | op1 = lit1; | |
2635 | } | |
2636 | ||
2637 | ||
400fbf9f | 2638 | /* First do the subtraction as integers; |
04044297 MM |
2639 | then drop through to build the divide operator. |
2640 | Do not do default conversions on the minus operator | |
2641 | in case restype is a short type. */ | |
400fbf9f JW |
2642 | |
2643 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), | |
04044297 | 2644 | convert (restype, op1), 0); |
ea8dd784 | 2645 | /* This generates an error if op1 is pointer to incomplete type. */ |
95602da1 | 2646 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (orig_op1)))) |
ea8dd784 | 2647 | error ("arithmetic on pointer to an incomplete type"); |
6946afd3 | 2648 | |
ea8dd784 | 2649 | /* This generates an error if op0 is pointer to incomplete type. */ |
400fbf9f JW |
2650 | op1 = c_size_in_bytes (target_type); |
2651 | ||
2652 | /* Divide by the size, in easiest possible way. */ | |
2653 | ||
6946afd3 | 2654 | result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); |
400fbf9f JW |
2655 | |
2656 | folded = fold (result); | |
2657 | if (folded == result) | |
2658 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2659 | return folded; | |
2660 | } | |
2661 | \f | |
2662 | /* Construct and perhaps optimize a tree representation | |
2663 | for a unary operation. CODE, a tree_code, specifies the operation | |
207bf485 JM |
2664 | and XARG is the operand. |
2665 | For any CODE other than ADDR_EXPR, FLAG nonzero suppresses | |
2666 | the default promotions (such as from short to int). | |
2667 | For ADDR_EXPR, the default promotions are not applied; FLAG nonzero | |
2668 | allows non-lvalues; this is only used to handle conversion of non-lvalue | |
2669 | arrays to pointers in C99. */ | |
400fbf9f JW |
2670 | |
2671 | tree | |
207bf485 | 2672 | build_unary_op (code, xarg, flag) |
400fbf9f JW |
2673 | enum tree_code code; |
2674 | tree xarg; | |
207bf485 | 2675 | int flag; |
400fbf9f JW |
2676 | { |
2677 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
b3694847 SS |
2678 | tree arg = xarg; |
2679 | tree argtype = 0; | |
2680 | enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); | |
400fbf9f | 2681 | tree val; |
207bf485 | 2682 | int noconvert = flag; |
400fbf9f JW |
2683 | |
2684 | if (typecode == ERROR_MARK) | |
2685 | return error_mark_node; | |
19552aa5 | 2686 | if (typecode == ENUMERAL_TYPE || typecode == BOOLEAN_TYPE) |
400fbf9f JW |
2687 | typecode = INTEGER_TYPE; |
2688 | ||
2689 | switch (code) | |
2690 | { | |
2691 | case CONVERT_EXPR: | |
2692 | /* This is used for unary plus, because a CONVERT_EXPR | |
2693 | is enough to prevent anybody from looking inside for | |
2694 | associativity, but won't generate any code. */ | |
b6a10c9f RS |
2695 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2696 | || typecode == COMPLEX_TYPE)) | |
ab87f8c8 JL |
2697 | { |
2698 | error ("wrong type argument to unary plus"); | |
2699 | return error_mark_node; | |
2700 | } | |
400fbf9f JW |
2701 | else if (!noconvert) |
2702 | arg = default_conversion (arg); | |
ae5d234e | 2703 | arg = non_lvalue (arg); |
400fbf9f JW |
2704 | break; |
2705 | ||
2706 | case NEGATE_EXPR: | |
b6a10c9f | 2707 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
cb2a532e AH |
2708 | || typecode == COMPLEX_TYPE |
2709 | || typecode == VECTOR_TYPE)) | |
ab87f8c8 JL |
2710 | { |
2711 | error ("wrong type argument to unary minus"); | |
2712 | return error_mark_node; | |
2713 | } | |
400fbf9f JW |
2714 | else if (!noconvert) |
2715 | arg = default_conversion (arg); | |
2716 | break; | |
2717 | ||
2718 | case BIT_NOT_EXPR: | |
34a80643 R |
2719 | if (typecode == INTEGER_TYPE || typecode == VECTOR_TYPE) |
2720 | { | |
2721 | if (!noconvert) | |
2722 | arg = default_conversion (arg); | |
2723 | } | |
2724 | else if (typecode == COMPLEX_TYPE) | |
1c2a9b35 RS |
2725 | { |
2726 | code = CONJ_EXPR; | |
60e9d01c JM |
2727 | if (pedantic) |
2728 | pedwarn ("ISO C does not support `~' for complex conjugation"); | |
1c2a9b35 RS |
2729 | if (!noconvert) |
2730 | arg = default_conversion (arg); | |
2731 | } | |
34a80643 | 2732 | else |
ab87f8c8 JL |
2733 | { |
2734 | error ("wrong type argument to bit-complement"); | |
2735 | return error_mark_node; | |
2736 | } | |
400fbf9f JW |
2737 | break; |
2738 | ||
2739 | case ABS_EXPR: | |
b6a10c9f RS |
2740 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2741 | || typecode == COMPLEX_TYPE)) | |
ab87f8c8 JL |
2742 | { |
2743 | error ("wrong type argument to abs"); | |
2744 | return error_mark_node; | |
2745 | } | |
400fbf9f JW |
2746 | else if (!noconvert) |
2747 | arg = default_conversion (arg); | |
2748 | break; | |
2749 | ||
1c2a9b35 RS |
2750 | case CONJ_EXPR: |
2751 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
2752 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
2753 | || typecode == COMPLEX_TYPE)) | |
ab87f8c8 JL |
2754 | { |
2755 | error ("wrong type argument to conjugation"); | |
2756 | return error_mark_node; | |
2757 | } | |
1c2a9b35 RS |
2758 | else if (!noconvert) |
2759 | arg = default_conversion (arg); | |
2760 | break; | |
2761 | ||
400fbf9f JW |
2762 | case TRUTH_NOT_EXPR: |
2763 | if (typecode != INTEGER_TYPE | |
2764 | && typecode != REAL_TYPE && typecode != POINTER_TYPE | |
b6a10c9f | 2765 | && typecode != COMPLEX_TYPE |
400fbf9f JW |
2766 | /* These will convert to a pointer. */ |
2767 | && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE) | |
2768 | { | |
ab87f8c8 JL |
2769 | error ("wrong type argument to unary exclamation mark"); |
2770 | return error_mark_node; | |
400fbf9f | 2771 | } |
78ef5b89 | 2772 | arg = c_common_truthvalue_conversion (arg); |
400fbf9f JW |
2773 | return invert_truthvalue (arg); |
2774 | ||
2775 | case NOP_EXPR: | |
2776 | break; | |
b6a10c9f RS |
2777 | |
2778 | case REALPART_EXPR: | |
2779 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2780 | return TREE_REALPART (arg); | |
2781 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2782 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2783 | else | |
2784 | return arg; | |
2785 | ||
2786 | case IMAGPART_EXPR: | |
2787 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2788 | return TREE_IMAGPART (arg); | |
2789 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2790 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2791 | else | |
2792 | return convert (TREE_TYPE (arg), integer_zero_node); | |
400fbf9f JW |
2793 | |
2794 | case PREINCREMENT_EXPR: | |
2795 | case POSTINCREMENT_EXPR: | |
2796 | case PREDECREMENT_EXPR: | |
2797 | case POSTDECREMENT_EXPR: | |
2798 | /* Handle complex lvalues (when permitted) | |
2799 | by reduction to simpler cases. */ | |
2800 | ||
207bf485 | 2801 | val = unary_complex_lvalue (code, arg, 0); |
400fbf9f JW |
2802 | if (val != 0) |
2803 | return val; | |
2804 | ||
b6a10c9f RS |
2805 | /* Increment or decrement the real part of the value, |
2806 | and don't change the imaginary part. */ | |
2807 | if (typecode == COMPLEX_TYPE) | |
2808 | { | |
2809 | tree real, imag; | |
2810 | ||
93cc1c69 JM |
2811 | if (pedantic) |
2812 | pedwarn ("ISO C does not support `++' and `--' on complex types"); | |
2813 | ||
b6a10c9f RS |
2814 | arg = stabilize_reference (arg); |
2815 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
2816 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
2817 | return build (COMPLEX_EXPR, TREE_TYPE (arg), | |
2818 | build_unary_op (code, real, 1), imag); | |
2819 | } | |
2820 | ||
400fbf9f JW |
2821 | /* Report invalid types. */ |
2822 | ||
2823 | if (typecode != POINTER_TYPE | |
2824 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) | |
2825 | { | |
53fcdc76 PB |
2826 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) |
2827 | error ("wrong type argument to increment"); | |
2828 | else | |
2829 | error ("wrong type argument to decrement"); | |
2830 | ||
ab87f8c8 | 2831 | return error_mark_node; |
400fbf9f JW |
2832 | } |
2833 | ||
2834 | { | |
b3694847 | 2835 | tree inc; |
400fbf9f JW |
2836 | tree result_type = TREE_TYPE (arg); |
2837 | ||
2838 | arg = get_unwidened (arg, 0); | |
2839 | argtype = TREE_TYPE (arg); | |
2840 | ||
2841 | /* Compute the increment. */ | |
2842 | ||
2843 | if (typecode == POINTER_TYPE) | |
2844 | { | |
6bc4e3d0 RS |
2845 | /* If pointer target is an undefined struct, |
2846 | we just cannot know how to do the arithmetic. */ | |
d0f062fb | 2847 | if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (result_type))) |
53fcdc76 PB |
2848 | { |
2849 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
2850 | error ("increment of pointer to unknown structure"); | |
2851 | else | |
2852 | error ("decrement of pointer to unknown structure"); | |
2853 | } | |
6bc4e3d0 RS |
2854 | else if ((pedantic || warn_pointer_arith) |
2855 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
2856 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
53fcdc76 PB |
2857 | { |
2858 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
2859 | pedwarn ("wrong type argument to increment"); | |
2860 | else | |
2861 | pedwarn ("wrong type argument to decrement"); | |
2862 | } | |
2863 | ||
0e9cff7f | 2864 | inc = c_size_in_bytes (TREE_TYPE (result_type)); |
400fbf9f JW |
2865 | } |
2866 | else | |
2867 | inc = integer_one_node; | |
2868 | ||
2869 | inc = convert (argtype, inc); | |
2870 | ||
2871 | /* Handle incrementing a cast-expression. */ | |
2872 | ||
2873 | while (1) | |
2874 | switch (TREE_CODE (arg)) | |
2875 | { | |
2876 | case NOP_EXPR: | |
2877 | case CONVERT_EXPR: | |
2878 | case FLOAT_EXPR: | |
2879 | case FIX_TRUNC_EXPR: | |
2880 | case FIX_FLOOR_EXPR: | |
2881 | case FIX_ROUND_EXPR: | |
2882 | case FIX_CEIL_EXPR: | |
ee71df46 | 2883 | pedantic_lvalue_warning (CONVERT_EXPR); |
400fbf9f JW |
2884 | /* If the real type has the same machine representation |
2885 | as the type it is cast to, we can make better output | |
2886 | by adding directly to the inside of the cast. */ | |
2887 | if ((TREE_CODE (TREE_TYPE (arg)) | |
2888 | == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
2889 | && (TYPE_MODE (TREE_TYPE (arg)) | |
2890 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0))))) | |
2891 | arg = TREE_OPERAND (arg, 0); | |
2892 | else | |
2893 | { | |
2894 | tree incremented, modify, value; | |
19552aa5 JM |
2895 | if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE) |
2896 | value = boolean_increment (code, arg); | |
400fbf9f | 2897 | else |
19552aa5 JM |
2898 | { |
2899 | arg = stabilize_reference (arg); | |
2900 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
2901 | value = arg; | |
2902 | else | |
2903 | value = save_expr (arg); | |
2904 | incremented = build (((code == PREINCREMENT_EXPR | |
2905 | || code == POSTINCREMENT_EXPR) | |
2906 | ? PLUS_EXPR : MINUS_EXPR), | |
2907 | argtype, value, inc); | |
2908 | TREE_SIDE_EFFECTS (incremented) = 1; | |
2909 | modify = build_modify_expr (arg, NOP_EXPR, incremented); | |
2910 | value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); | |
2911 | } | |
400fbf9f JW |
2912 | TREE_USED (value) = 1; |
2913 | return value; | |
2914 | } | |
2915 | break; | |
2916 | ||
2917 | default: | |
2918 | goto give_up; | |
2919 | } | |
2920 | give_up: | |
2921 | ||
2922 | /* Complain about anything else that is not a true lvalue. */ | |
2923 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
2924 | || code == POSTINCREMENT_EXPR) | |
ab87f8c8 JL |
2925 | ? "invalid lvalue in increment" |
2926 | : "invalid lvalue in decrement"))) | |
400fbf9f JW |
2927 | return error_mark_node; |
2928 | ||
2929 | /* Report a read-only lvalue. */ | |
26b3c423 | 2930 | if (TREE_READONLY (arg)) |
400fbf9f JW |
2931 | readonly_warning (arg, |
2932 | ((code == PREINCREMENT_EXPR | |
2933 | || code == POSTINCREMENT_EXPR) | |
57771fe8 | 2934 | ? "increment" : "decrement")); |
400fbf9f | 2935 | |
19552aa5 JM |
2936 | if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE) |
2937 | val = boolean_increment (code, arg); | |
2938 | else | |
2939 | val = build (code, TREE_TYPE (arg), arg, inc); | |
400fbf9f JW |
2940 | TREE_SIDE_EFFECTS (val) = 1; |
2941 | val = convert (result_type, val); | |
2942 | if (TREE_CODE (val) != code) | |
2943 | TREE_NO_UNUSED_WARNING (val) = 1; | |
2944 | return val; | |
2945 | } | |
2946 | ||
2947 | case ADDR_EXPR: | |
207bf485 | 2948 | /* Note that this operation never does default_conversion. */ |
400fbf9f JW |
2949 | |
2950 | /* Let &* cancel out to simplify resulting code. */ | |
2951 | if (TREE_CODE (arg) == INDIRECT_REF) | |
2952 | { | |
2953 | /* Don't let this be an lvalue. */ | |
2954 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
2955 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
2956 | return TREE_OPERAND (arg, 0); | |
2957 | } | |
2958 | ||
2959 | /* For &x[y], return x+y */ | |
2960 | if (TREE_CODE (arg) == ARRAY_REF) | |
2961 | { | |
dffd7eb6 | 2962 | if (!c_mark_addressable (TREE_OPERAND (arg, 0))) |
400fbf9f JW |
2963 | return error_mark_node; |
2964 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
2965 | TREE_OPERAND (arg, 1), 1); | |
2966 | } | |
2967 | ||
2968 | /* Handle complex lvalues (when permitted) | |
2969 | by reduction to simpler cases. */ | |
207bf485 | 2970 | val = unary_complex_lvalue (code, arg, flag); |
400fbf9f JW |
2971 | if (val != 0) |
2972 | return val; | |
2973 | ||
2974 | #if 0 /* Turned off because inconsistent; | |
2975 | float f; *&(int)f = 3.4 stores in int format | |
2976 | whereas (int)f = 3.4 stores in float format. */ | |
2977 | /* Address of a cast is just a cast of the address | |
2978 | of the operand of the cast. */ | |
2979 | switch (TREE_CODE (arg)) | |
2980 | { | |
2981 | case NOP_EXPR: | |
2982 | case CONVERT_EXPR: | |
2983 | case FLOAT_EXPR: | |
2984 | case FIX_TRUNC_EXPR: | |
2985 | case FIX_FLOOR_EXPR: | |
2986 | case FIX_ROUND_EXPR: | |
2987 | case FIX_CEIL_EXPR: | |
2988 | if (pedantic) | |
89abf8d1 | 2989 | pedwarn ("ISO C forbids the address of a cast expression"); |
400fbf9f JW |
2990 | return convert (build_pointer_type (TREE_TYPE (arg)), |
2991 | build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), | |
2992 | 0)); | |
2993 | } | |
2994 | #endif | |
2995 | ||
400fbf9f | 2996 | /* Anything not already handled and not a true memory reference |
207bf485 JM |
2997 | or a non-lvalue array is an error. */ |
2998 | else if (typecode != FUNCTION_TYPE && !flag | |
ab87f8c8 | 2999 | && !lvalue_or_else (arg, "invalid lvalue in unary `&'")) |
400fbf9f JW |
3000 | return error_mark_node; |
3001 | ||
3002 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
3003 | argtype = TREE_TYPE (arg); | |
770ae6cc | 3004 | |
3932261a MM |
3005 | /* If the lvalue is const or volatile, merge that into the type |
3006 | to which the address will point. Note that you can't get a | |
3007 | restricted pointer by taking the address of something, so we | |
3008 | only have to deal with `const' and `volatile' here. */ | |
770ae6cc RK |
3009 | if ((DECL_P (arg) || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') |
3010 | && (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg))) | |
3011 | argtype = c_build_type_variant (argtype, | |
3012 | TREE_READONLY (arg), | |
3013 | TREE_THIS_VOLATILE (arg)); | |
400fbf9f JW |
3014 | |
3015 | argtype = build_pointer_type (argtype); | |
3016 | ||
dffd7eb6 | 3017 | if (!c_mark_addressable (arg)) |
400fbf9f JW |
3018 | return error_mark_node; |
3019 | ||
3020 | { | |
3021 | tree addr; | |
3022 | ||
3023 | if (TREE_CODE (arg) == COMPONENT_REF) | |
3024 | { | |
3025 | tree field = TREE_OPERAND (arg, 1); | |
3026 | ||
207bf485 | 3027 | addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), flag); |
400fbf9f | 3028 | |
ef86d2a6 | 3029 | if (DECL_C_BIT_FIELD (field)) |
400fbf9f JW |
3030 | { |
3031 | error ("attempt to take address of bit-field structure member `%s'", | |
3032 | IDENTIFIER_POINTER (DECL_NAME (field))); | |
3033 | return error_mark_node; | |
3034 | } | |
3035 | ||
770ae6cc RK |
3036 | addr = fold (build (PLUS_EXPR, argtype, |
3037 | convert (argtype, addr), | |
3038 | convert (argtype, byte_position (field)))); | |
400fbf9f JW |
3039 | } |
3040 | else | |
3041 | addr = build1 (code, argtype, arg); | |
3042 | ||
3043 | /* Address of a static or external variable or | |
8706edbc RS |
3044 | file-scope function counts as a constant. */ |
3045 | if (staticp (arg) | |
3046 | && ! (TREE_CODE (arg) == FUNCTION_DECL | |
3047 | && DECL_CONTEXT (arg) != 0)) | |
7d2d49af | 3048 | TREE_CONSTANT (addr) = 1; |
400fbf9f JW |
3049 | return addr; |
3050 | } | |
e9a25f70 JL |
3051 | |
3052 | default: | |
3053 | break; | |
400fbf9f JW |
3054 | } |
3055 | ||
ab87f8c8 JL |
3056 | if (argtype == 0) |
3057 | argtype = TREE_TYPE (arg); | |
3058 | return fold (build1 (code, argtype, arg)); | |
400fbf9f JW |
3059 | } |
3060 | ||
3061 | #if 0 | |
3062 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, | |
3063 | convert ARG with the same conversions in the same order | |
3064 | and return the result. */ | |
3065 | ||
3066 | static tree | |
3067 | convert_sequence (conversions, arg) | |
3068 | tree conversions; | |
3069 | tree arg; | |
3070 | { | |
3071 | switch (TREE_CODE (conversions)) | |
3072 | { | |
3073 | case NOP_EXPR: | |
3074 | case CONVERT_EXPR: | |
3075 | case FLOAT_EXPR: | |
3076 | case FIX_TRUNC_EXPR: | |
3077 | case FIX_FLOOR_EXPR: | |
3078 | case FIX_ROUND_EXPR: | |
3079 | case FIX_CEIL_EXPR: | |
3080 | return convert (TREE_TYPE (conversions), | |
3081 | convert_sequence (TREE_OPERAND (conversions, 0), | |
3082 | arg)); | |
3083 | ||
3084 | default: | |
3085 | return arg; | |
3086 | } | |
3087 | } | |
3088 | #endif /* 0 */ | |
3089 | ||
3090 | /* Return nonzero if REF is an lvalue valid for this language. | |
3091 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
1394aabd | 3092 | Lvalues can have their address taken, unless they have DECL_REGISTER. */ |
400fbf9f JW |
3093 | |
3094 | int | |
3095 | lvalue_p (ref) | |
3096 | tree ref; | |
3097 | { | |
b3694847 | 3098 | enum tree_code code = TREE_CODE (ref); |
400fbf9f JW |
3099 | |
3100 | switch (code) | |
3101 | { | |
b6a10c9f RS |
3102 | case REALPART_EXPR: |
3103 | case IMAGPART_EXPR: | |
400fbf9f JW |
3104 | case COMPONENT_REF: |
3105 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
3106 | ||
db3acfa5 | 3107 | case COMPOUND_LITERAL_EXPR: |
400fbf9f JW |
3108 | case STRING_CST: |
3109 | return 1; | |
3110 | ||
3111 | case INDIRECT_REF: | |
3112 | case ARRAY_REF: | |
3113 | case VAR_DECL: | |
3114 | case PARM_DECL: | |
3115 | case RESULT_DECL: | |
3116 | case ERROR_MARK: | |
e9a25f70 JL |
3117 | return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE |
3118 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE); | |
cff9c407 RK |
3119 | |
3120 | case BIND_EXPR: | |
3121 | case RTL_EXPR: | |
e9a25f70 JL |
3122 | return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE; |
3123 | ||
3124 | default: | |
3125 | return 0; | |
400fbf9f | 3126 | } |
400fbf9f JW |
3127 | } |
3128 | ||
3129 | /* Return nonzero if REF is an lvalue valid for this language; | |
3130 | otherwise, print an error message and return zero. */ | |
3131 | ||
3132 | int | |
ab87f8c8 | 3133 | lvalue_or_else (ref, msgid) |
400fbf9f | 3134 | tree ref; |
5d5993dd | 3135 | const char *msgid; |
400fbf9f JW |
3136 | { |
3137 | int win = lvalue_p (ref); | |
c5c76735 | 3138 | |
400fbf9f | 3139 | if (! win) |
913d0833 | 3140 | error ("%s", msgid); |
c5c76735 | 3141 | |
400fbf9f JW |
3142 | return win; |
3143 | } | |
3144 | ||
3145 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
3146 | for certain kinds of expressions which are not really lvalues | |
207bf485 JM |
3147 | but which we can accept as lvalues. If FLAG is nonzero, then |
3148 | non-lvalues are OK since we may be converting a non-lvalue array to | |
3149 | a pointer in C99. | |
400fbf9f JW |
3150 | |
3151 | If ARG is not a kind of expression we can handle, return zero. */ | |
3152 | ||
3153 | static tree | |
207bf485 | 3154 | unary_complex_lvalue (code, arg, flag) |
400fbf9f JW |
3155 | enum tree_code code; |
3156 | tree arg; | |
207bf485 | 3157 | int flag; |
400fbf9f JW |
3158 | { |
3159 | /* Handle (a, b) used as an "lvalue". */ | |
3160 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
3161 | { | |
3162 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
e9a25f70 JL |
3163 | |
3164 | /* If this returns a function type, it isn't really being used as | |
3165 | an lvalue, so don't issue a warning about it. */ | |
207bf485 | 3166 | if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE && !flag) |
e9a25f70 JL |
3167 | pedantic_lvalue_warning (COMPOUND_EXPR); |
3168 | ||
400fbf9f JW |
3169 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), |
3170 | TREE_OPERAND (arg, 0), real_result); | |
3171 | } | |
3172 | ||
3173 | /* Handle (a ? b : c) used as an "lvalue". */ | |
3174 | if (TREE_CODE (arg) == COND_EXPR) | |
3175 | { | |
207bf485 JM |
3176 | if (!flag) |
3177 | pedantic_lvalue_warning (COND_EXPR); | |
3178 | if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE && !flag) | |
e9a25f70 JL |
3179 | pedantic_lvalue_warning (COMPOUND_EXPR); |
3180 | ||
400fbf9f JW |
3181 | return (build_conditional_expr |
3182 | (TREE_OPERAND (arg, 0), | |
207bf485 JM |
3183 | build_unary_op (code, TREE_OPERAND (arg, 1), flag), |
3184 | build_unary_op (code, TREE_OPERAND (arg, 2), flag))); | |
400fbf9f JW |
3185 | } |
3186 | ||
3187 | return 0; | |
3188 | } | |
3189 | ||
3190 | /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR | |
3191 | COMPOUND_EXPR, or CONVERT_EXPR (for casts). */ | |
3192 | ||
3193 | static void | |
3194 | pedantic_lvalue_warning (code) | |
3195 | enum tree_code code; | |
3196 | { | |
3197 | if (pedantic) | |
913d0833 KG |
3198 | switch (code) |
3199 | { | |
3200 | case COND_EXPR: | |
89abf8d1 | 3201 | pedwarn ("ISO C forbids use of conditional expressions as lvalues"); |
913d0833 KG |
3202 | break; |
3203 | case COMPOUND_EXPR: | |
89abf8d1 | 3204 | pedwarn ("ISO C forbids use of compound expressions as lvalues"); |
913d0833 KG |
3205 | break; |
3206 | default: | |
89abf8d1 | 3207 | pedwarn ("ISO C forbids use of cast expressions as lvalues"); |
913d0833 KG |
3208 | break; |
3209 | } | |
400fbf9f JW |
3210 | } |
3211 | \f | |
3212 | /* Warn about storing in something that is `const'. */ | |
3213 | ||
3214 | void | |
ab87f8c8 | 3215 | readonly_warning (arg, msgid) |
400fbf9f | 3216 | tree arg; |
5d5993dd | 3217 | const char *msgid; |
400fbf9f | 3218 | { |
400fbf9f JW |
3219 | if (TREE_CODE (arg) == COMPONENT_REF) |
3220 | { | |
3221 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
ab87f8c8 | 3222 | readonly_warning (TREE_OPERAND (arg, 0), msgid); |
400fbf9f | 3223 | else |
ab87f8c8 JL |
3224 | pedwarn ("%s of read-only member `%s'", _(msgid), |
3225 | IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1)))); | |
400fbf9f JW |
3226 | } |
3227 | else if (TREE_CODE (arg) == VAR_DECL) | |
ab87f8c8 JL |
3228 | pedwarn ("%s of read-only variable `%s'", _(msgid), |
3229 | IDENTIFIER_POINTER (DECL_NAME (arg))); | |
400fbf9f | 3230 | else |
ab87f8c8 | 3231 | pedwarn ("%s of read-only location", _(msgid)); |
400fbf9f JW |
3232 | } |
3233 | \f | |
3234 | /* Mark EXP saying that we need to be able to take the | |
3235 | address of it; it should not be allocated in a register. | |
dffd7eb6 | 3236 | Returns true if successful. */ |
400fbf9f | 3237 | |
dffd7eb6 NB |
3238 | bool |
3239 | c_mark_addressable (exp) | |
400fbf9f JW |
3240 | tree exp; |
3241 | { | |
b3694847 | 3242 | tree x = exp; |
dffd7eb6 | 3243 | |
400fbf9f JW |
3244 | while (1) |
3245 | switch (TREE_CODE (x)) | |
3246 | { | |
400fbf9f | 3247 | case COMPONENT_REF: |
1598f4da | 3248 | if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1))) |
36c336d1 | 3249 | { |
b0287a90 | 3250 | error ("cannot take address of bit-field `%s'", |
36c336d1 | 3251 | IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1)))); |
dffd7eb6 | 3252 | return false; |
36c336d1 | 3253 | } |
1598f4da | 3254 | |
0f41302f | 3255 | /* ... fall through ... */ |
1598f4da RK |
3256 | |
3257 | case ADDR_EXPR: | |
400fbf9f | 3258 | case ARRAY_REF: |
ce95080d RS |
3259 | case REALPART_EXPR: |
3260 | case IMAGPART_EXPR: | |
400fbf9f JW |
3261 | x = TREE_OPERAND (x, 0); |
3262 | break; | |
3263 | ||
db3acfa5 | 3264 | case COMPOUND_LITERAL_EXPR: |
400fbf9f JW |
3265 | case CONSTRUCTOR: |
3266 | TREE_ADDRESSABLE (x) = 1; | |
dffd7eb6 | 3267 | return true; |
400fbf9f JW |
3268 | |
3269 | case VAR_DECL: | |
3270 | case CONST_DECL: | |
3271 | case PARM_DECL: | |
3272 | case RESULT_DECL: | |
1394aabd RS |
3273 | if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
3274 | && DECL_NONLOCAL (x)) | |
4bb6d2f8 RS |
3275 | { |
3276 | if (TREE_PUBLIC (x)) | |
3277 | { | |
3278 | error ("global register variable `%s' used in nested function", | |
3279 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
dffd7eb6 | 3280 | return false; |
4bb6d2f8 RS |
3281 | } |
3282 | pedwarn ("register variable `%s' used in nested function", | |
3283 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3284 | } | |
1394aabd | 3285 | else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)) |
400fbf9f JW |
3286 | { |
3287 | if (TREE_PUBLIC (x)) | |
3288 | { | |
3289 | error ("address of global register variable `%s' requested", | |
3290 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
dffd7eb6 | 3291 | return false; |
400fbf9f | 3292 | } |
bbbd6700 RK |
3293 | |
3294 | /* If we are making this addressable due to its having | |
3295 | volatile components, give a different error message. Also | |
3296 | handle the case of an unnamed parameter by not trying | |
3297 | to give the name. */ | |
3298 | ||
3299 | else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x))) | |
3300 | { | |
3301 | error ("cannot put object with volatile field into register"); | |
dffd7eb6 | 3302 | return false; |
bbbd6700 RK |
3303 | } |
3304 | ||
400fbf9f JW |
3305 | pedwarn ("address of register variable `%s' requested", |
3306 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3307 | } | |
3308 | put_var_into_stack (x); | |
3309 | ||
3310 | /* drops in */ | |
3311 | case FUNCTION_DECL: | |
3312 | TREE_ADDRESSABLE (x) = 1; | |
3313 | #if 0 /* poplevel deals with this now. */ | |
3314 | if (DECL_CONTEXT (x) == 0) | |
3315 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
3316 | #endif | |
3317 | ||
3318 | default: | |
dffd7eb6 | 3319 | return true; |
400fbf9f JW |
3320 | } |
3321 | } | |
3322 | \f | |
3323 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
3324 | ||
3325 | tree | |
3326 | build_conditional_expr (ifexp, op1, op2) | |
3327 | tree ifexp, op1, op2; | |
3328 | { | |
b3694847 SS |
3329 | tree type1; |
3330 | tree type2; | |
3331 | enum tree_code code1; | |
3332 | enum tree_code code2; | |
3333 | tree result_type = NULL; | |
fd5d5b94 | 3334 | tree orig_op1 = op1, orig_op2 = op2; |
400fbf9f | 3335 | |
78ef5b89 | 3336 | ifexp = c_common_truthvalue_conversion (default_conversion (ifexp)); |
400fbf9f | 3337 | |
400fbf9f JW |
3338 | #if 0 /* Produces wrong result if within sizeof. */ |
3339 | /* Don't promote the operands separately if they promote | |
3340 | the same way. Return the unpromoted type and let the combined | |
3341 | value get promoted if necessary. */ | |
3342 | ||
3343 | if (TREE_TYPE (op1) == TREE_TYPE (op2) | |
3344 | && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE | |
3345 | && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE | |
3346 | && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE) | |
3347 | { | |
3348 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
a29f2ec1 | 3349 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f JW |
3350 | |
3351 | return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2)); | |
3352 | } | |
3353 | #endif | |
3354 | ||
e855c5ce | 3355 | /* Promote both alternatives. */ |
400fbf9f JW |
3356 | |
3357 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
3358 | op1 = default_conversion (op1); | |
3359 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
3360 | op2 = default_conversion (op2); | |
3361 | ||
e855c5ce RS |
3362 | if (TREE_CODE (ifexp) == ERROR_MARK |
3363 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
3364 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
3365 | return error_mark_node; | |
3366 | ||
400fbf9f JW |
3367 | type1 = TREE_TYPE (op1); |
3368 | code1 = TREE_CODE (type1); | |
3369 | type2 = TREE_TYPE (op2); | |
3370 | code2 = TREE_CODE (type2); | |
3371 | ||
3372 | /* Quickly detect the usual case where op1 and op2 have the same type | |
3373 | after promotion. */ | |
1ad409d2 RS |
3374 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
3375 | { | |
3376 | if (type1 == type2) | |
3377 | result_type = type1; | |
3378 | else | |
3379 | result_type = TYPE_MAIN_VARIANT (type1); | |
3380 | } | |
f519a452 GDR |
3381 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE |
3382 | || code1 == COMPLEX_TYPE) | |
3383 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE | |
3384 | || code2 == COMPLEX_TYPE)) | |
400fbf9f JW |
3385 | { |
3386 | result_type = common_type (type1, type2); | |
cb3ca04e ZW |
3387 | |
3388 | /* If -Wsign-compare, warn here if type1 and type2 have | |
3389 | different signedness. We'll promote the signed to unsigned | |
3390 | and later code won't know it used to be different. | |
3391 | Do this check on the original types, so that explicit casts | |
3392 | will be considered, but default promotions won't. */ | |
3393 | if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare) | |
3394 | && !skip_evaluation) | |
3395 | { | |
3396 | int unsigned_op1 = TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3397 | int unsigned_op2 = TREE_UNSIGNED (TREE_TYPE (orig_op2)); | |
3398 | ||
3399 | if (unsigned_op1 ^ unsigned_op2) | |
3400 | { | |
3401 | /* Do not warn if the result type is signed, since the | |
3402 | signed type will only be chosen if it can represent | |
3403 | all the values of the unsigned type. */ | |
3404 | if (! TREE_UNSIGNED (result_type)) | |
3405 | /* OK */; | |
3406 | /* Do not warn if the signed quantity is an unsuffixed | |
3407 | integer literal (or some static constant expression | |
3408 | involving such literals) and it is non-negative. */ | |
3facde26 KG |
3409 | else if ((unsigned_op2 && tree_expr_nonnegative_p (op1)) |
3410 | || (unsigned_op1 && tree_expr_nonnegative_p (op2))) | |
cb3ca04e ZW |
3411 | /* OK */; |
3412 | else | |
3413 | warning ("signed and unsigned type in conditional expression"); | |
3414 | } | |
3415 | } | |
400fbf9f JW |
3416 | } |
3417 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3418 | { | |
3419 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
89abf8d1 | 3420 | pedwarn ("ISO C forbids conditional expr with only one void side"); |
400fbf9f JW |
3421 | result_type = void_type_node; |
3422 | } | |
3423 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3424 | { | |
3425 | if (comp_target_types (type1, type2)) | |
3426 | result_type = common_type (type1, type2); | |
fd5d5b94 RS |
3427 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node |
3428 | && TREE_CODE (orig_op1) != NOP_EXPR) | |
400fbf9f | 3429 | result_type = qualify_type (type2, type1); |
fd5d5b94 RS |
3430 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node |
3431 | && TREE_CODE (orig_op2) != NOP_EXPR) | |
400fbf9f | 3432 | result_type = qualify_type (type1, type2); |
71653180 | 3433 | else if (VOID_TYPE_P (TREE_TYPE (type1))) |
400fbf9f JW |
3434 | { |
3435 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) | |
89abf8d1 | 3436 | pedwarn ("ISO C forbids conditional expr between `void *' and function pointer"); |
1d7ff272 JM |
3437 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type1), |
3438 | TREE_TYPE (type2))); | |
400fbf9f | 3439 | } |
71653180 | 3440 | else if (VOID_TYPE_P (TREE_TYPE (type2))) |
400fbf9f JW |
3441 | { |
3442 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) | |
89abf8d1 | 3443 | pedwarn ("ISO C forbids conditional expr between `void *' and function pointer"); |
1d7ff272 JM |
3444 | result_type = build_pointer_type (qualify_type (TREE_TYPE (type2), |
3445 | TREE_TYPE (type1))); | |
400fbf9f JW |
3446 | } |
3447 | else | |
3448 | { | |
3449 | pedwarn ("pointer type mismatch in conditional expression"); | |
3450 | result_type = build_pointer_type (void_type_node); | |
3451 | } | |
3452 | } | |
3453 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3454 | { | |
3455 | if (! integer_zerop (op2)) | |
3456 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3457 | else | |
3458 | { | |
3459 | op2 = null_pointer_node; | |
400fbf9f JW |
3460 | } |
3461 | result_type = type1; | |
3462 | } | |
3463 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3464 | { | |
3465 | if (!integer_zerop (op1)) | |
3466 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3467 | else | |
3468 | { | |
3469 | op1 = null_pointer_node; | |
400fbf9f JW |
3470 | } |
3471 | result_type = type2; | |
3472 | } | |
3473 | ||
3474 | if (!result_type) | |
3475 | { | |
3476 | if (flag_cond_mismatch) | |
3477 | result_type = void_type_node; | |
3478 | else | |
3479 | { | |
3480 | error ("type mismatch in conditional expression"); | |
3481 | return error_mark_node; | |
3482 | } | |
3483 | } | |
3484 | ||
1dfdf85d RS |
3485 | /* Merge const and volatile flags of the incoming types. */ |
3486 | result_type | |
3487 | = build_type_variant (result_type, | |
48c73063 RS |
3488 | TREE_READONLY (op1) || TREE_READONLY (op2), |
3489 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
e58cd767 | 3490 | |
400fbf9f | 3491 | if (result_type != TREE_TYPE (op1)) |
e58cd767 | 3492 | op1 = convert_and_check (result_type, op1); |
400fbf9f | 3493 | if (result_type != TREE_TYPE (op2)) |
e58cd767 | 3494 | op2 = convert_and_check (result_type, op2); |
400fbf9f | 3495 | |
5abb45f2 | 3496 | if (TREE_CODE (ifexp) == INTEGER_CST) |
a29f2ec1 | 3497 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f | 3498 | |
400fbf9f JW |
3499 | return fold (build (COND_EXPR, result_type, ifexp, op1, op2)); |
3500 | } | |
3501 | \f | |
3502 | /* Given a list of expressions, return a compound expression | |
3503 | that performs them all and returns the value of the last of them. */ | |
3504 | ||
3505 | tree | |
3506 | build_compound_expr (list) | |
3507 | tree list; | |
82bde854 | 3508 | { |
43a5a542 | 3509 | return internal_build_compound_expr (list, TRUE); |
82bde854 MM |
3510 | } |
3511 | ||
3512 | static tree | |
3513 | internal_build_compound_expr (list, first_p) | |
3514 | tree list; | |
3515 | int first_p; | |
400fbf9f | 3516 | { |
b3694847 | 3517 | tree rest; |
400fbf9f JW |
3518 | |
3519 | if (TREE_CHAIN (list) == 0) | |
3520 | { | |
207bf485 JM |
3521 | /* Convert arrays and functions to pointers when there |
3522 | really is a comma operator. */ | |
3523 | if (!first_p) | |
3524 | TREE_VALUE (list) | |
3525 | = default_function_array_conversion (TREE_VALUE (list)); | |
714a0864 | 3526 | |
6dc42e49 | 3527 | #if 0 /* If something inside inhibited lvalueness, we should not override. */ |
400fbf9f JW |
3528 | /* Consider (x, y+0), which is not an lvalue since y+0 is not. */ |
3529 | ||
3530 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3531 | if (TREE_CODE (list) == NON_LVALUE_EXPR) | |
3532 | list = TREE_OPERAND (list, 0); | |
3533 | #endif | |
3534 | ||
439f6027 | 3535 | /* Don't let (0, 0) be null pointer constant. */ |
82bde854 | 3536 | if (!first_p && integer_zerop (TREE_VALUE (list))) |
439f6027 RS |
3537 | return non_lvalue (TREE_VALUE (list)); |
3538 | return TREE_VALUE (list); | |
400fbf9f JW |
3539 | } |
3540 | ||
82bde854 | 3541 | rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE); |
400fbf9f | 3542 | |
0e7c47fa RK |
3543 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) |
3544 | { | |
3545 | /* The left-hand operand of a comma expression is like an expression | |
3546 | statement: with -W or -Wunused, we should warn if it doesn't have | |
3547 | any side-effects, unless it was explicitly cast to (void). */ | |
078721e1 | 3548 | if ((extra_warnings || warn_unused_value) |
0e7c47fa | 3549 | && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR |
71653180 | 3550 | && VOID_TYPE_P (TREE_TYPE (TREE_VALUE (list))))) |
0e7c47fa RK |
3551 | warning ("left-hand operand of comma expression has no effect"); |
3552 | ||
3553 | /* When pedantic, a compound expression can be neither an lvalue | |
3554 | nor an integer constant expression. */ | |
3555 | if (! pedantic) | |
3556 | return rest; | |
3557 | } | |
3558 | ||
3559 | /* With -Wunused, we should also warn if the left-hand operand does have | |
3560 | side-effects, but computes a value which is not used. For example, in | |
3561 | `foo() + bar(), baz()' the result of the `+' operator is not used, | |
3562 | so we should issue a warning. */ | |
078721e1 | 3563 | else if (warn_unused_value) |
0e7c47fa | 3564 | warn_if_unused_value (TREE_VALUE (list)); |
400fbf9f JW |
3565 | |
3566 | return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest); | |
3567 | } | |
3568 | ||
3569 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ | |
3570 | ||
3571 | tree | |
3572 | build_c_cast (type, expr) | |
b3694847 | 3573 | tree type; |
400fbf9f JW |
3574 | tree expr; |
3575 | { | |
b3694847 | 3576 | tree value = expr; |
400fbf9f JW |
3577 | |
3578 | if (type == error_mark_node || expr == error_mark_node) | |
3579 | return error_mark_node; | |
3580 | type = TYPE_MAIN_VARIANT (type); | |
3581 | ||
3582 | #if 0 | |
3583 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3584 | if (TREE_CODE (value) == NON_LVALUE_EXPR) | |
3585 | value = TREE_OPERAND (value, 0); | |
3586 | #endif | |
3587 | ||
3588 | if (TREE_CODE (type) == ARRAY_TYPE) | |
3589 | { | |
3590 | error ("cast specifies array type"); | |
3591 | return error_mark_node; | |
3592 | } | |
3593 | ||
3594 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
3595 | { | |
3596 | error ("cast specifies function type"); | |
3597 | return error_mark_node; | |
3598 | } | |
3599 | ||
f375b7a7 | 3600 | if (type == TYPE_MAIN_VARIANT (TREE_TYPE (value))) |
400fbf9f JW |
3601 | { |
3602 | if (pedantic) | |
3603 | { | |
3604 | if (TREE_CODE (type) == RECORD_TYPE | |
3605 | || TREE_CODE (type) == UNION_TYPE) | |
89abf8d1 | 3606 | pedwarn ("ISO C forbids casting nonscalar to the same type"); |
400fbf9f JW |
3607 | } |
3608 | } | |
3609 | else if (TREE_CODE (type) == UNION_TYPE) | |
3610 | { | |
3611 | tree field; | |
207bf485 | 3612 | value = default_function_array_conversion (value); |
0c16ddf7 | 3613 | |
400fbf9f JW |
3614 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
3615 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
3616 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
3617 | break; | |
3618 | ||
3619 | if (field) | |
3620 | { | |
5d5993dd | 3621 | const char *name; |
281ec92f | 3622 | tree t; |
805f961c | 3623 | |
400fbf9f | 3624 | if (pedantic) |
89abf8d1 | 3625 | pedwarn ("ISO C forbids casts to union type"); |
805f961c RS |
3626 | if (TYPE_NAME (type) != 0) |
3627 | { | |
3628 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
3629 | name = IDENTIFIER_POINTER (TYPE_NAME (type)); | |
3630 | else | |
3631 | name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
3632 | } | |
3633 | else | |
3634 | name = ""; | |
281ec92f | 3635 | t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE, |
273cf2e4 | 3636 | build_tree_list (field, value)), 0); |
281ec92f RS |
3637 | TREE_CONSTANT (t) = TREE_CONSTANT (value); |
3638 | return t; | |
400fbf9f JW |
3639 | } |
3640 | error ("cast to union type from type not present in union"); | |
3641 | return error_mark_node; | |
3642 | } | |
3643 | else | |
3644 | { | |
10d5caec | 3645 | tree otype, ovalue; |
53b01f59 RS |
3646 | |
3647 | /* If casting to void, avoid the error that would come | |
3648 | from default_conversion in the case of a non-lvalue array. */ | |
3649 | if (type == void_type_node) | |
3650 | return build1 (CONVERT_EXPR, type, value); | |
3651 | ||
400fbf9f JW |
3652 | /* Convert functions and arrays to pointers, |
3653 | but don't convert any other types. */ | |
207bf485 | 3654 | value = default_function_array_conversion (value); |
400fbf9f JW |
3655 | otype = TREE_TYPE (value); |
3656 | ||
d45cf215 | 3657 | /* Optionally warn about potentially worrisome casts. */ |
400fbf9f JW |
3658 | |
3659 | if (warn_cast_qual | |
3660 | && TREE_CODE (type) == POINTER_TYPE | |
3661 | && TREE_CODE (otype) == POINTER_TYPE) | |
3662 | { | |
f5963e61 JL |
3663 | tree in_type = type; |
3664 | tree in_otype = otype; | |
af702de8 RS |
3665 | int added = 0; |
3666 | int discarded = 0; | |
f5963e61 | 3667 | |
cd6311ef ZW |
3668 | /* Check that the qualifiers on IN_TYPE are a superset of |
3669 | the qualifiers of IN_OTYPE. The outermost level of | |
3670 | POINTER_TYPE nodes is uninteresting and we stop as soon | |
3671 | as we hit a non-POINTER_TYPE node on either type. */ | |
3672 | do | |
3673 | { | |
3674 | in_otype = TREE_TYPE (in_otype); | |
3675 | in_type = TREE_TYPE (in_type); | |
af702de8 RS |
3676 | |
3677 | /* GNU C allows cv-qualified function types. 'const' | |
3678 | means the function is very pure, 'volatile' means it | |
3679 | can't return. We need to warn when such qualifiers | |
3680 | are added, not when they're taken away. */ | |
3681 | if (TREE_CODE (in_otype) == FUNCTION_TYPE | |
3682 | && TREE_CODE (in_type) == FUNCTION_TYPE) | |
3683 | added |= (TYPE_QUALS (in_type) & ~TYPE_QUALS (in_otype)); | |
3684 | else | |
3685 | discarded |= (TYPE_QUALS (in_otype) & ~TYPE_QUALS (in_type)); | |
cd6311ef ZW |
3686 | } |
3687 | while (TREE_CODE (in_type) == POINTER_TYPE | |
3688 | && TREE_CODE (in_otype) == POINTER_TYPE); | |
3689 | ||
af702de8 RS |
3690 | if (added) |
3691 | warning ("cast adds new qualifiers to function type"); | |
3692 | ||
3693 | if (discarded) | |
3932261a MM |
3694 | /* There are qualifiers present in IN_OTYPE that are not |
3695 | present in IN_TYPE. */ | |
6fffb55c | 3696 | warning ("cast discards qualifiers from pointer target type"); |
400fbf9f JW |
3697 | } |
3698 | ||
3699 | /* Warn about possible alignment problems. */ | |
d45cf215 | 3700 | if (STRICT_ALIGNMENT && warn_cast_align |
400fbf9f JW |
3701 | && TREE_CODE (type) == POINTER_TYPE |
3702 | && TREE_CODE (otype) == POINTER_TYPE | |
3703 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3704 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
ec9aa895 RK |
3705 | /* Don't warn about opaque types, where the actual alignment |
3706 | restriction is unknown. */ | |
3707 | && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE | |
3708 | || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE) | |
3709 | && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode) | |
400fbf9f JW |
3710 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) |
3711 | warning ("cast increases required alignment of target type"); | |
400fbf9f JW |
3712 | |
3713 | if (TREE_CODE (type) == INTEGER_TYPE | |
3714 | && TREE_CODE (otype) == POINTER_TYPE | |
c9b7f31c RS |
3715 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
3716 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3717 | warning ("cast from pointer to integer of different size"); |
3718 | ||
796bb373 RK |
3719 | if (warn_bad_function_cast |
3720 | && TREE_CODE (value) == CALL_EXPR | |
3721 | && TREE_CODE (type) != TREE_CODE (otype)) | |
3722 | warning ("cast does not match function type"); | |
3723 | ||
400fbf9f JW |
3724 | if (TREE_CODE (type) == POINTER_TYPE |
3725 | && TREE_CODE (otype) == INTEGER_TYPE | |
2918ed3c | 3726 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
c9b7f31c RS |
3727 | /* Don't warn about converting any constant. */ |
3728 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3729 | warning ("cast to pointer from integer of different size"); |
3730 | ||
10d5caec | 3731 | ovalue = value; |
400fbf9f | 3732 | value = convert (type, value); |
e58cd767 RS |
3733 | |
3734 | /* Ignore any integer overflow caused by the cast. */ | |
3735 | if (TREE_CODE (value) == INTEGER_CST) | |
10d5caec PE |
3736 | { |
3737 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
3738 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
3739 | } | |
400fbf9f JW |
3740 | } |
3741 | ||
684d9f3b | 3742 | /* Pedantically, don't let (void *) (FOO *) 0 be a null pointer constant. */ |
fd5d5b94 RS |
3743 | if (pedantic && TREE_CODE (value) == INTEGER_CST |
3744 | && TREE_CODE (expr) == INTEGER_CST | |
3745 | && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE) | |
3746 | value = non_lvalue (value); | |
3747 | ||
3748 | /* If pedantic, don't let a cast be an lvalue. */ | |
400fbf9f | 3749 | if (value == expr && pedantic) |
fd5d5b94 RS |
3750 | value = non_lvalue (value); |
3751 | ||
400fbf9f JW |
3752 | return value; |
3753 | } | |
15b732b2 NB |
3754 | |
3755 | /* Interpret a cast of expression EXPR to type TYPE. */ | |
3756 | tree | |
3757 | c_cast_expr (type, expr) | |
3758 | tree type, expr; | |
3759 | { | |
3760 | int saved_wsp = warn_strict_prototypes; | |
3761 | ||
3762 | /* This avoids warnings about unprototyped casts on | |
3763 | integers. E.g. "#define SIG_DFL (void(*)())0". */ | |
3764 | if (TREE_CODE (expr) == INTEGER_CST) | |
3765 | warn_strict_prototypes = 0; | |
3766 | type = groktypename (type); | |
3767 | warn_strict_prototypes = saved_wsp; | |
3768 | ||
3769 | return build_c_cast (type, expr); | |
3770 | } | |
3771 | ||
400fbf9f JW |
3772 | \f |
3773 | /* Build an assignment expression of lvalue LHS from value RHS. | |
3774 | MODIFYCODE is the code for a binary operator that we use | |
3775 | to combine the old value of LHS with RHS to get the new value. | |
3776 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
3777 | ||
3778 | tree | |
3779 | build_modify_expr (lhs, modifycode, rhs) | |
3780 | tree lhs, rhs; | |
3781 | enum tree_code modifycode; | |
3782 | { | |
b3694847 | 3783 | tree result; |
400fbf9f JW |
3784 | tree newrhs; |
3785 | tree lhstype = TREE_TYPE (lhs); | |
3786 | tree olhstype = lhstype; | |
3787 | ||
3788 | /* Types that aren't fully specified cannot be used in assignments. */ | |
3789 | lhs = require_complete_type (lhs); | |
3790 | ||
3791 | /* Avoid duplicate error messages from operands that had errors. */ | |
3792 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
3793 | return error_mark_node; | |
3794 | ||
3795 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
3796 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
3797 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
3798 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
3799 | rhs = TREE_OPERAND (rhs, 0); | |
3800 | ||
3801 | newrhs = rhs; | |
3802 | ||
3803 | /* Handle control structure constructs used as "lvalues". */ | |
3804 | ||
3805 | switch (TREE_CODE (lhs)) | |
3806 | { | |
3807 | /* Handle (a, b) used as an "lvalue". */ | |
3808 | case COMPOUND_EXPR: | |
3809 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
c5c76735 | 3810 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), modifycode, rhs); |
19d76e60 RK |
3811 | if (TREE_CODE (newrhs) == ERROR_MARK) |
3812 | return error_mark_node; | |
400fbf9f | 3813 | return build (COMPOUND_EXPR, lhstype, |
19d76e60 RK |
3814 | TREE_OPERAND (lhs, 0), newrhs); |
3815 | ||
400fbf9f JW |
3816 | /* Handle (a ? b : c) used as an "lvalue". */ |
3817 | case COND_EXPR: | |
3818 | pedantic_lvalue_warning (COND_EXPR); | |
3819 | rhs = save_expr (rhs); | |
3820 | { | |
3821 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
3822 | except that the RHS goes through a save-expr | |
3823 | so the code to compute it is only emitted once. */ | |
3824 | tree cond | |
3825 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
3826 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
3827 | modifycode, rhs), | |
3828 | build_modify_expr (TREE_OPERAND (lhs, 2), | |
3829 | modifycode, rhs)); | |
19d76e60 RK |
3830 | if (TREE_CODE (cond) == ERROR_MARK) |
3831 | return cond; | |
400fbf9f JW |
3832 | /* Make sure the code to compute the rhs comes out |
3833 | before the split. */ | |
3834 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
3835 | /* But cast it to void to avoid an "unused" error. */ | |
3836 | convert (void_type_node, rhs), cond); | |
3837 | } | |
e9a25f70 JL |
3838 | default: |
3839 | break; | |
400fbf9f JW |
3840 | } |
3841 | ||
3842 | /* If a binary op has been requested, combine the old LHS value with the RHS | |
3843 | producing the value we should actually store into the LHS. */ | |
3844 | ||
3845 | if (modifycode != NOP_EXPR) | |
3846 | { | |
3847 | lhs = stabilize_reference (lhs); | |
3848 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
3849 | } | |
3850 | ||
3851 | /* Handle a cast used as an "lvalue". | |
3852 | We have already performed any binary operator using the value as cast. | |
3853 | Now convert the result to the cast type of the lhs, | |
3854 | and then true type of the lhs and store it there; | |
3855 | then convert result back to the cast type to be the value | |
3856 | of the assignment. */ | |
3857 | ||
3858 | switch (TREE_CODE (lhs)) | |
3859 | { | |
3860 | case NOP_EXPR: | |
3861 | case CONVERT_EXPR: | |
3862 | case FLOAT_EXPR: | |
3863 | case FIX_TRUNC_EXPR: | |
3864 | case FIX_FLOOR_EXPR: | |
3865 | case FIX_ROUND_EXPR: | |
3866 | case FIX_CEIL_EXPR: | |
207bf485 | 3867 | newrhs = default_function_array_conversion (newrhs); |
400fbf9f JW |
3868 | { |
3869 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
3870 | tree result; | |
3871 | result = build_modify_expr (inner_lhs, NOP_EXPR, | |
3872 | convert (TREE_TYPE (inner_lhs), | |
3873 | convert (lhstype, newrhs))); | |
19d76e60 RK |
3874 | if (TREE_CODE (result) == ERROR_MARK) |
3875 | return result; | |
400fbf9f JW |
3876 | pedantic_lvalue_warning (CONVERT_EXPR); |
3877 | return convert (TREE_TYPE (lhs), result); | |
3878 | } | |
e9a25f70 JL |
3879 | |
3880 | default: | |
3881 | break; | |
400fbf9f JW |
3882 | } |
3883 | ||
3884 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
3885 | Reject anything strange now. */ | |
3886 | ||
ab87f8c8 | 3887 | if (!lvalue_or_else (lhs, "invalid lvalue in assignment")) |
400fbf9f JW |
3888 | return error_mark_node; |
3889 | ||
3890 | /* Warn about storing in something that is `const'. */ | |
3891 | ||
3892 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
3893 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
3894 | || TREE_CODE (lhstype) == UNION_TYPE) | |
3895 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
3896 | readonly_warning (lhs, "assignment"); | |
3897 | ||
3898 | /* If storing into a structure or union member, | |
3899 | it has probably been given type `int'. | |
3900 | Compute the type that would go with | |
3901 | the actual amount of storage the member occupies. */ | |
3902 | ||
3903 | if (TREE_CODE (lhs) == COMPONENT_REF | |
3904 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
19552aa5 | 3905 | || TREE_CODE (lhstype) == BOOLEAN_TYPE |
400fbf9f JW |
3906 | || TREE_CODE (lhstype) == REAL_TYPE |
3907 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
3908 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
3909 | ||
3910 | /* If storing in a field that is in actuality a short or narrower than one, | |
3911 | we must store in the field in its actual type. */ | |
3912 | ||
3913 | if (lhstype != TREE_TYPE (lhs)) | |
3914 | { | |
3915 | lhs = copy_node (lhs); | |
3916 | TREE_TYPE (lhs) = lhstype; | |
3917 | } | |
3918 | ||
3919 | /* Convert new value to destination type. */ | |
3920 | ||
ab87f8c8 | 3921 | newrhs = convert_for_assignment (lhstype, newrhs, _("assignment"), |
9b7267b8 | 3922 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
3923 | if (TREE_CODE (newrhs) == ERROR_MARK) |
3924 | return error_mark_node; | |
3925 | ||
bb58bec5 JM |
3926 | /* Scan operands */ |
3927 | ||
400fbf9f JW |
3928 | result = build (MODIFY_EXPR, lhstype, lhs, newrhs); |
3929 | TREE_SIDE_EFFECTS (result) = 1; | |
3930 | ||
3931 | /* If we got the LHS in a different type for storing in, | |
3932 | convert the result back to the nominal type of LHS | |
3933 | so that the value we return always has the same type | |
3934 | as the LHS argument. */ | |
3935 | ||
3936 | if (olhstype == TREE_TYPE (result)) | |
3937 | return result; | |
ab87f8c8 | 3938 | return convert_for_assignment (olhstype, result, _("assignment"), |
9b7267b8 | 3939 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
3940 | } |
3941 | \f | |
3942 | /* Convert value RHS to type TYPE as preparation for an assignment | |
3943 | to an lvalue of type TYPE. | |
3944 | The real work of conversion is done by `convert'. | |
3945 | The purpose of this function is to generate error messages | |
3946 | for assignments that are not allowed in C. | |
3947 | ERRTYPE is a string to use in error messages: | |
3948 | "assignment", "return", etc. If it is null, this is parameter passing | |
ab87f8c8 | 3949 | for a function call (and different error messages are output). |
400fbf9f JW |
3950 | |
3951 | FUNNAME is the name of the function being called, | |
3952 | as an IDENTIFIER_NODE, or null. | |
3953 | PARMNUM is the number of the argument, for printing in error messages. */ | |
3954 | ||
3955 | static tree | |
9b7267b8 | 3956 | convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum) |
400fbf9f | 3957 | tree type, rhs; |
5d5993dd | 3958 | const char *errtype; |
9b7267b8 | 3959 | tree fundecl, funname; |
400fbf9f JW |
3960 | int parmnum; |
3961 | { | |
b3694847 SS |
3962 | enum tree_code codel = TREE_CODE (type); |
3963 | tree rhstype; | |
3964 | enum tree_code coder; | |
400fbf9f JW |
3965 | |
3966 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
3967 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
3968 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
3969 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
3970 | rhs = TREE_OPERAND (rhs, 0); | |
3971 | ||
3972 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
3973 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE) | |
3974 | rhs = default_conversion (rhs); | |
8c3a6477 | 3975 | else if (optimize && TREE_CODE (rhs) == VAR_DECL) |
2f74f7e9 | 3976 | rhs = decl_constant_value_for_broken_optimization (rhs); |
400fbf9f JW |
3977 | |
3978 | rhstype = TREE_TYPE (rhs); | |
3979 | coder = TREE_CODE (rhstype); | |
3980 | ||
3981 | if (coder == ERROR_MARK) | |
3982 | return error_mark_node; | |
3983 | ||
3984 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
e58cd767 RS |
3985 | { |
3986 | overflow_warning (rhs); | |
8b40563c TW |
3987 | /* Check for Objective-C protocols. This will issue a warning if |
3988 | there are protocol violations. No need to use the return value. */ | |
0f7866e7 ZL |
3989 | if (flag_objc) |
3990 | objc_comptypes (type, rhstype, 0); | |
e58cd767 RS |
3991 | return rhs; |
3992 | } | |
400fbf9f JW |
3993 | |
3994 | if (coder == VOID_TYPE) | |
3995 | { | |
3996 | error ("void value not ignored as it ought to be"); | |
3997 | return error_mark_node; | |
3998 | } | |
9f720c3e GK |
3999 | /* A type converts to a reference to it. |
4000 | This code doesn't fully support references, it's just for the | |
4001 | special case of va_start and va_copy. */ | |
4002 | if (codel == REFERENCE_TYPE | |
4003 | && comptypes (TREE_TYPE (type), TREE_TYPE (rhs)) == 1) | |
4004 | { | |
a1652cee JM |
4005 | if (!lvalue_p (rhs)) |
4006 | { | |
4007 | error ("cannot pass rvalue to reference parameter"); | |
4008 | return error_mark_node; | |
4009 | } | |
dffd7eb6 | 4010 | if (!c_mark_addressable (rhs)) |
9f720c3e GK |
4011 | return error_mark_node; |
4012 | rhs = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (rhs)), rhs); | |
4013 | ||
4014 | /* We already know that these two types are compatible, but they | |
4015 | may not be exactly identical. In fact, `TREE_TYPE (type)' is | |
4016 | likely to be __builtin_va_list and `TREE_TYPE (rhs)' is | |
4017 | likely to be va_list, a typedef to __builtin_va_list, which | |
4018 | is different enough that it will cause problems later. */ | |
4019 | if (TREE_TYPE (TREE_TYPE (rhs)) != TREE_TYPE (type)) | |
4020 | rhs = build1 (NOP_EXPR, build_pointer_type (TREE_TYPE (type)), rhs); | |
4021 | ||
4022 | rhs = build1 (NOP_EXPR, type, rhs); | |
4023 | return rhs; | |
4024 | } | |
400fbf9f | 4025 | /* Arithmetic types all interconvert, and enum is treated like int. */ |
9f720c3e | 4026 | else if ((codel == INTEGER_TYPE || codel == REAL_TYPE |
19552aa5 JM |
4027 | || codel == ENUMERAL_TYPE || codel == COMPLEX_TYPE |
4028 | || codel == BOOLEAN_TYPE) | |
cb2a532e | 4029 | && (coder == INTEGER_TYPE || coder == REAL_TYPE |
19552aa5 JM |
4030 | || coder == ENUMERAL_TYPE || coder == COMPLEX_TYPE |
4031 | || coder == BOOLEAN_TYPE)) | |
da3c6115 | 4032 | return convert_and_check (type, rhs); |
61179109 | 4033 | |
7e842ef8 PE |
4034 | /* Conversion to a transparent union from its member types. |
4035 | This applies only to function arguments. */ | |
4036 | else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype) | |
4037 | { | |
4038 | tree memb_types; | |
4039 | tree marginal_memb_type = 0; | |
4040 | ||
4041 | for (memb_types = TYPE_FIELDS (type); memb_types; | |
4042 | memb_types = TREE_CHAIN (memb_types)) | |
4043 | { | |
4044 | tree memb_type = TREE_TYPE (memb_types); | |
4045 | ||
4046 | if (comptypes (TYPE_MAIN_VARIANT (memb_type), | |
4047 | TYPE_MAIN_VARIANT (rhstype))) | |
4048 | break; | |
4049 | ||
4050 | if (TREE_CODE (memb_type) != POINTER_TYPE) | |
4051 | continue; | |
4052 | ||
4053 | if (coder == POINTER_TYPE) | |
4054 | { | |
b3694847 SS |
4055 | tree ttl = TREE_TYPE (memb_type); |
4056 | tree ttr = TREE_TYPE (rhstype); | |
7e842ef8 PE |
4057 | |
4058 | /* Any non-function converts to a [const][volatile] void * | |
4059 | and vice versa; otherwise, targets must be the same. | |
4060 | Meanwhile, the lhs target must have all the qualifiers of | |
4061 | the rhs. */ | |
71653180 | 4062 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) |
7e842ef8 PE |
4063 | || comp_target_types (memb_type, rhstype)) |
4064 | { | |
4065 | /* If this type won't generate any warnings, use it. */ | |
3932261a MM |
4066 | if (TYPE_QUALS (ttl) == TYPE_QUALS (ttr) |
4067 | || ((TREE_CODE (ttr) == FUNCTION_TYPE | |
4068 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4069 | ? ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) | |
4070 | == TYPE_QUALS (ttr)) | |
b58c9a79 | 4071 | : ((TYPE_QUALS (ttl) | TYPE_QUALS (ttr)) |
3932261a | 4072 | == TYPE_QUALS (ttl)))) |
7e842ef8 PE |
4073 | break; |
4074 | ||
4075 | /* Keep looking for a better type, but remember this one. */ | |
4076 | if (! marginal_memb_type) | |
4077 | marginal_memb_type = memb_type; | |
4078 | } | |
4079 | } | |
4080 | ||
4081 | /* Can convert integer zero to any pointer type. */ | |
4082 | if (integer_zerop (rhs) | |
4083 | || (TREE_CODE (rhs) == NOP_EXPR | |
4084 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
4085 | { | |
4086 | rhs = null_pointer_node; | |
4087 | break; | |
4088 | } | |
4089 | } | |
4090 | ||
4091 | if (memb_types || marginal_memb_type) | |
4092 | { | |
4093 | if (! memb_types) | |
4094 | { | |
4095 | /* We have only a marginally acceptable member type; | |
0f41302f | 4096 | it needs a warning. */ |
b3694847 SS |
4097 | tree ttl = TREE_TYPE (marginal_memb_type); |
4098 | tree ttr = TREE_TYPE (rhstype); | |
7e842ef8 PE |
4099 | |
4100 | /* Const and volatile mean something different for function | |
4101 | types, so the usual warnings are not appropriate. */ | |
4102 | if (TREE_CODE (ttr) == FUNCTION_TYPE | |
4103 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4104 | { | |
4105 | /* Because const and volatile on functions are | |
4106 | restrictions that say the function will not do | |
4107 | certain things, it is okay to use a const or volatile | |
4108 | function where an ordinary one is wanted, but not | |
4109 | vice-versa. */ | |
3932261a MM |
4110 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) |
4111 | warn_for_assignment ("%s makes qualified function pointer from unqualified", | |
ab87f8c8 | 4112 | errtype, funname, parmnum); |
7e842ef8 | 4113 | } |
3932261a MM |
4114 | else if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) |
4115 | warn_for_assignment ("%s discards qualifiers from pointer target type", | |
ab87f8c8 | 4116 | errtype, funname, |
3932261a | 4117 | parmnum); |
7e842ef8 PE |
4118 | } |
4119 | ||
4120 | if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl)) | |
89abf8d1 | 4121 | pedwarn ("ISO C prohibits argument conversion to union type"); |
7e842ef8 PE |
4122 | |
4123 | return build1 (NOP_EXPR, type, rhs); | |
4124 | } | |
4125 | } | |
4126 | ||
400fbf9f | 4127 | /* Conversions among pointers */ |
98d64f69 | 4128 | else if ((codel == POINTER_TYPE || codel == REFERENCE_TYPE) |
a1652cee | 4129 | && (coder == codel)) |
400fbf9f | 4130 | { |
b3694847 SS |
4131 | tree ttl = TREE_TYPE (type); |
4132 | tree ttr = TREE_TYPE (rhstype); | |
400fbf9f JW |
4133 | |
4134 | /* Any non-function converts to a [const][volatile] void * | |
4135 | and vice versa; otherwise, targets must be the same. | |
4136 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
71653180 | 4137 | if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) |
790e9490 | 4138 | || comp_target_types (type, rhstype) |
ceef8ce4 NB |
4139 | || (c_common_unsigned_type (TYPE_MAIN_VARIANT (ttl)) |
4140 | == c_common_unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
400fbf9f JW |
4141 | { |
4142 | if (pedantic | |
71653180 | 4143 | && ((VOID_TYPE_P (ttl) && TREE_CODE (ttr) == FUNCTION_TYPE) |
400fbf9f | 4144 | || |
71653180 | 4145 | (VOID_TYPE_P (ttr) |
fd5d5b94 RS |
4146 | /* Check TREE_CODE to catch cases like (void *) (char *) 0 |
4147 | which are not ANSI null ptr constants. */ | |
4148 | && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR) | |
400fbf9f | 4149 | && TREE_CODE (ttl) == FUNCTION_TYPE))) |
89abf8d1 | 4150 | warn_for_assignment ("ISO C forbids %s between function pointer and `void *'", |
ab87f8c8 | 4151 | errtype, funname, parmnum); |
400fbf9f JW |
4152 | /* Const and volatile mean something different for function types, |
4153 | so the usual warnings are not appropriate. */ | |
4154 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
caf2e8e4 | 4155 | && TREE_CODE (ttl) != FUNCTION_TYPE) |
400fbf9f | 4156 | { |
3932261a MM |
4157 | if (TYPE_QUALS (ttr) & ~TYPE_QUALS (ttl)) |
4158 | warn_for_assignment ("%s discards qualifiers from pointer target type", | |
ab87f8c8 | 4159 | errtype, funname, parmnum); |
790e9490 RS |
4160 | /* If this is not a case of ignoring a mismatch in signedness, |
4161 | no warning. */ | |
71653180 | 4162 | else if (VOID_TYPE_P (ttl) || VOID_TYPE_P (ttr) |
790e9490 RS |
4163 | || comp_target_types (type, rhstype)) |
4164 | ; | |
4165 | /* If there is a mismatch, do warn. */ | |
4166 | else if (pedantic) | |
4167 | warn_for_assignment ("pointer targets in %s differ in signedness", | |
ab87f8c8 | 4168 | errtype, funname, parmnum); |
400fbf9f | 4169 | } |
d949d5df RK |
4170 | else if (TREE_CODE (ttl) == FUNCTION_TYPE |
4171 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
400fbf9f JW |
4172 | { |
4173 | /* Because const and volatile on functions are restrictions | |
4174 | that say the function will not do certain things, | |
4175 | it is okay to use a const or volatile function | |
4176 | where an ordinary one is wanted, but not vice-versa. */ | |
3932261a MM |
4177 | if (TYPE_QUALS (ttl) & ~TYPE_QUALS (ttr)) |
4178 | warn_for_assignment ("%s makes qualified function pointer from unqualified", | |
ab87f8c8 | 4179 | errtype, funname, parmnum); |
400fbf9f JW |
4180 | } |
4181 | } | |
400fbf9f JW |
4182 | else |
4183 | warn_for_assignment ("%s from incompatible pointer type", | |
ab87f8c8 | 4184 | errtype, funname, parmnum); |
400fbf9f JW |
4185 | return convert (type, rhs); |
4186 | } | |
4187 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
4188 | { | |
2918ed3c | 4189 | /* An explicit constant 0 can convert to a pointer, |
f1a2b955 RS |
4190 | or one that results from arithmetic, even including |
4191 | a cast to integer type. */ | |
4192 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs)) | |
4193 | && | |
4194 | ! (TREE_CODE (rhs) == NOP_EXPR | |
4195 | && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE | |
4196 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST | |
4197 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
400fbf9f JW |
4198 | { |
4199 | warn_for_assignment ("%s makes pointer from integer without a cast", | |
ab87f8c8 | 4200 | errtype, funname, parmnum); |
400fbf9f JW |
4201 | return convert (type, rhs); |
4202 | } | |
4203 | return null_pointer_node; | |
4204 | } | |
4205 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) | |
4206 | { | |
4207 | warn_for_assignment ("%s makes integer from pointer without a cast", | |
ab87f8c8 | 4208 | errtype, funname, parmnum); |
400fbf9f JW |
4209 | return convert (type, rhs); |
4210 | } | |
19552aa5 JM |
4211 | else if (codel == BOOLEAN_TYPE && coder == POINTER_TYPE) |
4212 | return convert (type, rhs); | |
400fbf9f JW |
4213 | |
4214 | if (!errtype) | |
4215 | { | |
4216 | if (funname) | |
8b40563c | 4217 | { |
0f7866e7 | 4218 | tree selector = objc_message_selector (); |
8b40563c TW |
4219 | |
4220 | if (selector && parmnum > 2) | |
4221 | error ("incompatible type for argument %d of `%s'", | |
4222 | parmnum - 2, IDENTIFIER_POINTER (selector)); | |
4223 | else | |
4224 | error ("incompatible type for argument %d of `%s'", | |
4225 | parmnum, IDENTIFIER_POINTER (funname)); | |
4226 | } | |
400fbf9f JW |
4227 | else |
4228 | error ("incompatible type for argument %d of indirect function call", | |
4229 | parmnum); | |
4230 | } | |
4231 | else | |
ab87f8c8 | 4232 | error ("incompatible types in %s", errtype); |
400fbf9f JW |
4233 | |
4234 | return error_mark_node; | |
4235 | } | |
4236 | ||
f735a153 JJ |
4237 | /* Convert VALUE for assignment into inlined parameter PARM. */ |
4238 | ||
4239 | tree | |
4240 | c_convert_parm_for_inlining (parm, value, fn) | |
4241 | tree parm, value, fn; | |
4242 | { | |
4243 | tree ret, type; | |
4244 | ||
4245 | /* If FN was prototyped, the value has been converted already | |
4246 | in convert_arguments. */ | |
4247 | if (! value || TYPE_ARG_TYPES (TREE_TYPE (fn))) | |
4248 | return value; | |
4249 | ||
4250 | type = TREE_TYPE (parm); | |
4251 | ret = convert_for_assignment (type, value, | |
4252 | (char *) 0 /* arg passing */, fn, | |
4253 | DECL_NAME (fn), 0); | |
4254 | if (PROMOTE_PROTOTYPES | |
4255 | && INTEGRAL_TYPE_P (type) | |
4256 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
4257 | ret = default_conversion (ret); | |
4258 | return ret; | |
4259 | } | |
4260 | ||
ab87f8c8 | 4261 | /* Print a warning using MSGID. |
400fbf9f JW |
4262 | It gets OPNAME as its one parameter. |
4263 | If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'". | |
4264 | FUNCTION and ARGNUM are handled specially if we are building an | |
4265 | Objective-C selector. */ | |
4266 | ||
4267 | static void | |
ab87f8c8 | 4268 | warn_for_assignment (msgid, opname, function, argnum) |
5d5993dd KG |
4269 | const char *msgid; |
4270 | const char *opname; | |
400fbf9f JW |
4271 | tree function; |
4272 | int argnum; | |
4273 | { | |
400fbf9f JW |
4274 | if (opname == 0) |
4275 | { | |
0f7866e7 | 4276 | tree selector = objc_message_selector (); |
5d5993dd | 4277 | char * new_opname; |
400fbf9f JW |
4278 | |
4279 | if (selector && argnum > 2) | |
4280 | { | |
4281 | function = selector; | |
4282 | argnum -= 2; | |
4283 | } | |
4284 | if (function) | |
4285 | { | |
4286 | /* Function name is known; supply it. */ | |
27c38fbe | 4287 | const char *const argstring = _("passing arg %d of `%s'"); |
5d5993dd KG |
4288 | new_opname = (char *) alloca (IDENTIFIER_LENGTH (function) |
4289 | + strlen (argstring) + 1 + 25 | |
4290 | /*%d*/ + 1); | |
4291 | sprintf (new_opname, argstring, argnum, | |
4292 | IDENTIFIER_POINTER (function)); | |
400fbf9f JW |
4293 | } |
4294 | else | |
4295 | { | |
3ef42a0c | 4296 | /* Function name unknown (call through ptr); just give arg number. */ |
27c38fbe | 4297 | const char *const argnofun = _("passing arg %d of pointer to function"); |
5d5993dd KG |
4298 | new_opname = (char *) alloca (strlen (argnofun) + 1 + 25 /*%d*/ + 1); |
4299 | sprintf (new_opname, argnofun, argnum); | |
400fbf9f | 4300 | } |
5d5993dd | 4301 | opname = new_opname; |
400fbf9f | 4302 | } |
ab87f8c8 | 4303 | pedwarn (msgid, opname); |
400fbf9f JW |
4304 | } |
4305 | \f | |
d9fc6069 JW |
4306 | /* If VALUE is a compound expr all of whose expressions are constant, then |
4307 | return its value. Otherwise, return error_mark_node. | |
4308 | ||
4309 | This is for handling COMPOUND_EXPRs as initializer elements | |
4310 | which is allowed with a warning when -pedantic is specified. */ | |
4311 | ||
4312 | static tree | |
4313 | valid_compound_expr_initializer (value, endtype) | |
4314 | tree value; | |
4315 | tree endtype; | |
4316 | { | |
4317 | if (TREE_CODE (value) == COMPOUND_EXPR) | |
4318 | { | |
4319 | if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype) | |
4320 | == error_mark_node) | |
4321 | return error_mark_node; | |
4322 | return valid_compound_expr_initializer (TREE_OPERAND (value, 1), | |
4323 | endtype); | |
4324 | } | |
4325 | else if (! TREE_CONSTANT (value) | |
4326 | && ! initializer_constant_valid_p (value, endtype)) | |
4327 | return error_mark_node; | |
4328 | else | |
4329 | return value; | |
4330 | } | |
400fbf9f JW |
4331 | \f |
4332 | /* Perform appropriate conversions on the initial value of a variable, | |
4333 | store it in the declaration DECL, | |
4334 | and print any error messages that are appropriate. | |
4335 | If the init is invalid, store an ERROR_MARK. */ | |
4336 | ||
4337 | void | |
4338 | store_init_value (decl, init) | |
4339 | tree decl, init; | |
4340 | { | |
b3694847 | 4341 | tree value, type; |
400fbf9f JW |
4342 | |
4343 | /* If variable's type was invalidly declared, just ignore it. */ | |
4344 | ||
4345 | type = TREE_TYPE (decl); | |
4346 | if (TREE_CODE (type) == ERROR_MARK) | |
4347 | return; | |
4348 | ||
4349 | /* Digest the specified initializer into an expression. */ | |
4350 | ||
273cf2e4 | 4351 | value = digest_init (type, init, TREE_STATIC (decl)); |
400fbf9f JW |
4352 | |
4353 | /* Store the expression if valid; else report error. */ | |
4354 | ||
4355 | #if 0 | |
4356 | /* Note that this is the only place we can detect the error | |
4357 | in a case such as struct foo bar = (struct foo) { x, y }; | |
d45cf215 | 4358 | where there is one initial value which is a constructor expression. */ |
400fbf9f JW |
4359 | if (value == error_mark_node) |
4360 | ; | |
4361 | else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value)) | |
4362 | { | |
4363 | error ("initializer for static variable is not constant"); | |
4364 | value = error_mark_node; | |
4365 | } | |
4366 | else if (TREE_STATIC (decl) | |
f0c70ef0 | 4367 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) |
400fbf9f JW |
4368 | { |
4369 | error ("initializer for static variable uses complicated arithmetic"); | |
4370 | value = error_mark_node; | |
4371 | } | |
4372 | else | |
4373 | { | |
4374 | if (pedantic && TREE_CODE (value) == CONSTRUCTOR) | |
4375 | { | |
4376 | if (! TREE_CONSTANT (value)) | |
4377 | pedwarn ("aggregate initializer is not constant"); | |
4378 | else if (! TREE_STATIC (value)) | |
4379 | pedwarn ("aggregate initializer uses complicated arithmetic"); | |
4380 | } | |
4381 | } | |
4382 | #endif | |
4383 | ||
cde6e684 | 4384 | if (warn_traditional && !in_system_header |
895ea614 KG |
4385 | && AGGREGATE_TYPE_P (TREE_TYPE (decl)) && ! TREE_STATIC (decl)) |
4386 | warning ("traditional C rejects automatic aggregate initialization"); | |
4387 | ||
10d5caec PE |
4388 | DECL_INITIAL (decl) = value; |
4389 | ||
26b3c423 | 4390 | /* ANSI wants warnings about out-of-range constant initializers. */ |
10d5caec | 4391 | STRIP_TYPE_NOPS (value); |
26b3c423 | 4392 | constant_expression_warning (value); |
ad47f1e5 JJ |
4393 | |
4394 | /* Check if we need to set array size from compound literal size. */ | |
4395 | if (TREE_CODE (type) == ARRAY_TYPE | |
4396 | && TYPE_DOMAIN (type) == 0 | |
4397 | && value != error_mark_node) | |
4398 | { | |
4399 | tree inside_init = init; | |
4400 | ||
4401 | if (TREE_CODE (init) == NON_LVALUE_EXPR) | |
4402 | inside_init = TREE_OPERAND (init, 0); | |
4403 | inside_init = fold (inside_init); | |
4404 | ||
4405 | if (TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
4406 | { | |
4407 | tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init); | |
4408 | ||
4409 | if (TYPE_DOMAIN (TREE_TYPE (decl))) | |
4410 | { | |
4411 | /* For int foo[] = (int [3]){1}; we need to set array size | |
4412 | now since later on array initializer will be just the | |
4413 | brace enclosed list of the compound literal. */ | |
4414 | TYPE_DOMAIN (type) = TYPE_DOMAIN (TREE_TYPE (decl)); | |
4415 | layout_type (type); | |
4416 | layout_decl (decl, 0); | |
4417 | } | |
4418 | } | |
4419 | } | |
400fbf9f JW |
4420 | } |
4421 | \f | |
075fc632 | 4422 | /* Methods for storing and printing names for error messages. */ |
d45cf215 RS |
4423 | |
4424 | /* Implement a spelling stack that allows components of a name to be pushed | |
4425 | and popped. Each element on the stack is this structure. */ | |
4426 | ||
4427 | struct spelling | |
4428 | { | |
4429 | int kind; | |
4430 | union | |
4431 | { | |
4432 | int i; | |
5d5993dd | 4433 | const char *s; |
d45cf215 RS |
4434 | } u; |
4435 | }; | |
4436 | ||
4437 | #define SPELLING_STRING 1 | |
4438 | #define SPELLING_MEMBER 2 | |
4439 | #define SPELLING_BOUNDS 3 | |
4440 | ||
4441 | static struct spelling *spelling; /* Next stack element (unused). */ | |
4442 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4443 | static int spelling_size; /* Size of the spelling stack. */ | |
4444 | ||
4445 | /* Macros to save and restore the spelling stack around push_... functions. | |
4446 | Alternative to SAVE_SPELLING_STACK. */ | |
4447 | ||
4448 | #define SPELLING_DEPTH() (spelling - spelling_base) | |
0f1e8126 | 4449 | #define RESTORE_SPELLING_DEPTH(DEPTH) (spelling = spelling_base + (DEPTH)) |
d45cf215 | 4450 | |
d45cf215 RS |
4451 | /* Push an element on the spelling stack with type KIND and assign VALUE |
4452 | to MEMBER. */ | |
4453 | ||
4454 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ | |
4455 | { \ | |
4456 | int depth = SPELLING_DEPTH (); \ | |
4457 | \ | |
4458 | if (depth >= spelling_size) \ | |
4459 | { \ | |
4460 | spelling_size += 10; \ | |
4461 | if (spelling_base == 0) \ | |
4462 | spelling_base \ | |
4463 | = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \ | |
4464 | else \ | |
4465 | spelling_base \ | |
4466 | = (struct spelling *) xrealloc (spelling_base, \ | |
4467 | spelling_size * sizeof (struct spelling)); \ | |
4468 | RESTORE_SPELLING_DEPTH (depth); \ | |
4469 | } \ | |
4470 | \ | |
4471 | spelling->kind = (KIND); \ | |
4472 | spelling->MEMBER = (VALUE); \ | |
4473 | spelling++; \ | |
4474 | } | |
4475 | ||
4476 | /* Push STRING on the stack. Printed literally. */ | |
4477 | ||
4478 | static void | |
4479 | push_string (string) | |
5d5993dd | 4480 | const char *string; |
d45cf215 RS |
4481 | { |
4482 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4483 | } | |
4484 | ||
4485 | /* Push a member name on the stack. Printed as '.' STRING. */ | |
4486 | ||
4487 | static void | |
19d76e60 RK |
4488 | push_member_name (decl) |
4489 | tree decl; | |
4490 | ||
d45cf215 | 4491 | { |
83182544 | 4492 | const char *const string |
19d76e60 | 4493 | = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>"; |
d45cf215 RS |
4494 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); |
4495 | } | |
4496 | ||
4497 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ | |
4498 | ||
4499 | static void | |
4500 | push_array_bounds (bounds) | |
4501 | int bounds; | |
4502 | { | |
4503 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4504 | } | |
4505 | ||
4506 | /* Compute the maximum size in bytes of the printed spelling. */ | |
4507 | ||
4508 | static int | |
4509 | spelling_length () | |
4510 | { | |
b3694847 SS |
4511 | int size = 0; |
4512 | struct spelling *p; | |
d45cf215 RS |
4513 | |
4514 | for (p = spelling_base; p < spelling; p++) | |
4515 | { | |
4516 | if (p->kind == SPELLING_BOUNDS) | |
4517 | size += 25; | |
4518 | else | |
4519 | size += strlen (p->u.s) + 1; | |
4520 | } | |
4521 | ||
4522 | return size; | |
4523 | } | |
4524 | ||
4525 | /* Print the spelling to BUFFER and return it. */ | |
4526 | ||
4527 | static char * | |
4528 | print_spelling (buffer) | |
b3694847 | 4529 | char *buffer; |
d45cf215 | 4530 | { |
b3694847 SS |
4531 | char *d = buffer; |
4532 | struct spelling *p; | |
d45cf215 RS |
4533 | |
4534 | for (p = spelling_base; p < spelling; p++) | |
4535 | if (p->kind == SPELLING_BOUNDS) | |
4536 | { | |
4537 | sprintf (d, "[%d]", p->u.i); | |
4538 | d += strlen (d); | |
4539 | } | |
4540 | else | |
4541 | { | |
b3694847 | 4542 | const char *s; |
d45cf215 RS |
4543 | if (p->kind == SPELLING_MEMBER) |
4544 | *d++ = '.'; | |
1d300e19 | 4545 | for (s = p->u.s; (*d = *s++); d++) |
d45cf215 RS |
4546 | ; |
4547 | } | |
4548 | *d++ = '\0'; | |
4549 | return buffer; | |
4550 | } | |
4551 | ||
400fbf9f | 4552 | /* Issue an error message for a bad initializer component. |
ab87f8c8 JL |
4553 | MSGID identifies the message. |
4554 | The component name is taken from the spelling stack. */ | |
400fbf9f JW |
4555 | |
4556 | void | |
ab87f8c8 | 4557 | error_init (msgid) |
5d5993dd | 4558 | const char *msgid; |
400fbf9f | 4559 | { |
ab87f8c8 | 4560 | char *ofwhat; |
400fbf9f | 4561 | |
a094954e | 4562 | error ("%s", _(msgid)); |
ab87f8c8 | 4563 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
400fbf9f | 4564 | if (*ofwhat) |
ab87f8c8 | 4565 | error ("(near initialization for `%s')", ofwhat); |
400fbf9f JW |
4566 | } |
4567 | ||
4568 | /* Issue a pedantic warning for a bad initializer component. | |
ab87f8c8 JL |
4569 | MSGID identifies the message. |
4570 | The component name is taken from the spelling stack. */ | |
400fbf9f JW |
4571 | |
4572 | void | |
ab87f8c8 | 4573 | pedwarn_init (msgid) |
5d5993dd | 4574 | const char *msgid; |
400fbf9f | 4575 | { |
ab87f8c8 | 4576 | char *ofwhat; |
400fbf9f | 4577 | |
a094954e | 4578 | pedwarn ("%s", _(msgid)); |
ab87f8c8 | 4579 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
400fbf9f | 4580 | if (*ofwhat) |
ab87f8c8 | 4581 | pedwarn ("(near initialization for `%s')", ofwhat); |
400fbf9f | 4582 | } |
b71c7f8a RK |
4583 | |
4584 | /* Issue a warning for a bad initializer component. | |
ab87f8c8 JL |
4585 | MSGID identifies the message. |
4586 | The component name is taken from the spelling stack. */ | |
b71c7f8a RK |
4587 | |
4588 | static void | |
ab87f8c8 | 4589 | warning_init (msgid) |
5d5993dd | 4590 | const char *msgid; |
b71c7f8a | 4591 | { |
ab87f8c8 | 4592 | char *ofwhat; |
b71c7f8a | 4593 | |
a094954e | 4594 | warning ("%s", _(msgid)); |
ab87f8c8 | 4595 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
b71c7f8a | 4596 | if (*ofwhat) |
ab87f8c8 | 4597 | warning ("(near initialization for `%s')", ofwhat); |
b71c7f8a | 4598 | } |
400fbf9f JW |
4599 | \f |
4600 | /* Digest the parser output INIT as an initializer for type TYPE. | |
4601 | Return a C expression of type TYPE to represent the initial value. | |
4602 | ||
273cf2e4 ZW |
4603 | REQUIRE_CONSTANT requests an error if non-constant initializers or |
4604 | elements are seen. */ | |
400fbf9f | 4605 | |
b62acd60 | 4606 | static tree |
273cf2e4 | 4607 | digest_init (type, init, require_constant) |
790e9490 | 4608 | tree type, init; |
273cf2e4 | 4609 | int require_constant; |
400fbf9f JW |
4610 | { |
4611 | enum tree_code code = TREE_CODE (type); | |
047de90b | 4612 | tree inside_init = init; |
400fbf9f | 4613 | |
de9a3171 DA |
4614 | if (type == error_mark_node |
4615 | || init == error_mark_node | |
822baa84 | 4616 | || TREE_TYPE (init) == error_mark_node) |
21a427cc | 4617 | return error_mark_node; |
400fbf9f JW |
4618 | |
4619 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4620 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4621 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f | 4622 | if (TREE_CODE (init) == NON_LVALUE_EXPR) |
047de90b | 4623 | inside_init = TREE_OPERAND (init, 0); |
400fbf9f | 4624 | |
b13aca19 AM |
4625 | inside_init = fold (inside_init); |
4626 | ||
400fbf9f JW |
4627 | /* Initialization of an array of chars from a string constant |
4628 | optionally enclosed in braces. */ | |
4629 | ||
4630 | if (code == ARRAY_TYPE) | |
4631 | { | |
4632 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
4633 | if ((typ1 == char_type_node | |
4634 | || typ1 == signed_char_type_node | |
4635 | || typ1 == unsigned_char_type_node | |
4636 | || typ1 == unsigned_wchar_type_node | |
4637 | || typ1 == signed_wchar_type_node) | |
fd5d5b94 | 4638 | && ((inside_init && TREE_CODE (inside_init) == STRING_CST))) |
400fbf9f | 4639 | { |
4d65300e RS |
4640 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
4641 | TYPE_MAIN_VARIANT (type))) | |
fd5d5b94 | 4642 | return inside_init; |
d11fdb45 | 4643 | |
fd5d5b94 | 4644 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) |
400fbf9f JW |
4645 | != char_type_node) |
4646 | && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node)) | |
4647 | { | |
ab87f8c8 | 4648 | error_init ("char-array initialized from wide string"); |
400fbf9f JW |
4649 | return error_mark_node; |
4650 | } | |
fd5d5b94 | 4651 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) |
400fbf9f JW |
4652 | == char_type_node) |
4653 | && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)) | |
4654 | { | |
ab87f8c8 | 4655 | error_init ("int-array initialized from non-wide string"); |
400fbf9f JW |
4656 | return error_mark_node; |
4657 | } | |
4658 | ||
fd5d5b94 | 4659 | TREE_TYPE (inside_init) = type; |
400fbf9f | 4660 | if (TYPE_DOMAIN (type) != 0 |
a63f73f8 | 4661 | && TYPE_SIZE (type) != 0 |
05bccae2 | 4662 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST |
fe9ef5d7 RS |
4663 | /* Subtract 1 (or sizeof (wchar_t)) |
4664 | because it's ok to ignore the terminating null char | |
400fbf9f | 4665 | that is counted in the length of the constant. */ |
05bccae2 RK |
4666 | && 0 > compare_tree_int (TYPE_SIZE_UNIT (type), |
4667 | TREE_STRING_LENGTH (inside_init) | |
4668 | - ((TYPE_PRECISION (typ1) | |
4669 | != TYPE_PRECISION (char_type_node)) | |
4670 | ? (TYPE_PRECISION (wchar_type_node) | |
4671 | / BITS_PER_UNIT) | |
4672 | : 1))) | |
4673 | pedwarn_init ("initializer-string for array of chars is too long"); | |
4674 | ||
fd5d5b94 | 4675 | return inside_init; |
400fbf9f JW |
4676 | } |
4677 | } | |
4678 | ||
de520661 RS |
4679 | /* Any type can be initialized |
4680 | from an expression of the same type, optionally with braces. */ | |
400fbf9f | 4681 | |
2726966d | 4682 | if (inside_init && TREE_TYPE (inside_init) != 0 |
5522c047 PB |
4683 | && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
4684 | TYPE_MAIN_VARIANT (type)) | |
2726966d | 4685 | || (code == ARRAY_TYPE |
3c3fa147 | 4686 | && comptypes (TREE_TYPE (inside_init), type)) |
e6834654 SS |
4687 | || (code == VECTOR_TYPE |
4688 | && comptypes (TREE_TYPE (inside_init), type)) | |
3c3fa147 | 4689 | || (code == POINTER_TYPE |
3c3fa147 RS |
4690 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4691 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE) | |
4692 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), | |
4693 | TREE_TYPE (type))))) | |
400fbf9f | 4694 | { |
207bf485 JM |
4695 | if (code == POINTER_TYPE) |
4696 | inside_init = default_function_array_conversion (inside_init); | |
59c83dbf JJ |
4697 | |
4698 | if (require_constant && !flag_isoc99 | |
4699 | && TREE_CODE (inside_init) == COMPOUND_LITERAL_EXPR) | |
4700 | { | |
4701 | /* As an extension, allow initializing objects with static storage | |
4702 | duration with compound literals (which are then treated just as | |
4703 | the brace enclosed list they contain). */ | |
4704 | tree decl = COMPOUND_LITERAL_EXPR_DECL (inside_init); | |
4705 | inside_init = DECL_INITIAL (decl); | |
4706 | } | |
4707 | ||
4708 | if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST | |
4709 | && TREE_CODE (inside_init) != CONSTRUCTOR) | |
400fbf9f | 4710 | { |
ab87f8c8 | 4711 | error_init ("array initialized from non-constant array expression"); |
400fbf9f JW |
4712 | return error_mark_node; |
4713 | } | |
4714 | ||
8c3a6477 | 4715 | if (optimize && TREE_CODE (inside_init) == VAR_DECL) |
2f74f7e9 | 4716 | inside_init = decl_constant_value_for_broken_optimization (inside_init); |
400fbf9f | 4717 | |
d9fc6069 JW |
4718 | /* Compound expressions can only occur here if -pedantic or |
4719 | -pedantic-errors is specified. In the later case, we always want | |
4720 | an error. In the former case, we simply want a warning. */ | |
4721 | if (require_constant && pedantic | |
4722 | && TREE_CODE (inside_init) == COMPOUND_EXPR) | |
4723 | { | |
4724 | inside_init | |
4725 | = valid_compound_expr_initializer (inside_init, | |
4726 | TREE_TYPE (inside_init)); | |
4727 | if (inside_init == error_mark_node) | |
ab87f8c8 | 4728 | error_init ("initializer element is not constant"); |
d9fc6069 | 4729 | else |
ab87f8c8 | 4730 | pedwarn_init ("initializer element is not constant"); |
d9fc6069 JW |
4731 | if (flag_pedantic_errors) |
4732 | inside_init = error_mark_node; | |
4733 | } | |
eb8543b3 MM |
4734 | else if (require_constant |
4735 | && (!TREE_CONSTANT (inside_init) | |
4736 | /* This test catches things like `7 / 0' which | |
4737 | result in an expression for which TREE_CONSTANT | |
4738 | is true, but which is not actually something | |
4739 | that is a legal constant. We really should not | |
4740 | be using this function, because it is a part of | |
4741 | the back-end. Instead, the expression should | |
4742 | already have been turned into ERROR_MARK_NODE. */ | |
4743 | || !initializer_constant_valid_p (inside_init, | |
4744 | TREE_TYPE (inside_init)))) | |
400fbf9f | 4745 | { |
ab87f8c8 | 4746 | error_init ("initializer element is not constant"); |
047de90b | 4747 | inside_init = error_mark_node; |
400fbf9f | 4748 | } |
400fbf9f | 4749 | |
047de90b | 4750 | return inside_init; |
400fbf9f JW |
4751 | } |
4752 | ||
400fbf9f JW |
4753 | /* Handle scalar types, including conversions. */ |
4754 | ||
4755 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE | |
47f8b473 | 4756 | || code == ENUMERAL_TYPE || code == BOOLEAN_TYPE || code == COMPLEX_TYPE) |
400fbf9f | 4757 | { |
e3a12f0c RS |
4758 | /* Note that convert_for_assignment calls default_conversion |
4759 | for arrays and functions. We must not call it in the | |
4760 | case where inside_init is a null pointer constant. */ | |
4761 | inside_init | |
ab87f8c8 | 4762 | = convert_for_assignment (type, init, _("initialization"), |
e3a12f0c | 4763 | NULL_TREE, NULL_TREE, 0); |
400fbf9f | 4764 | |
047de90b | 4765 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f | 4766 | { |
ab87f8c8 | 4767 | error_init ("initializer element is not constant"); |
047de90b | 4768 | inside_init = error_mark_node; |
400fbf9f | 4769 | } |
f0c70ef0 RS |
4770 | else if (require_constant |
4771 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f | 4772 | { |
ab87f8c8 | 4773 | error_init ("initializer element is not computable at load time"); |
047de90b | 4774 | inside_init = error_mark_node; |
400fbf9f JW |
4775 | } |
4776 | ||
047de90b | 4777 | return inside_init; |
400fbf9f JW |
4778 | } |
4779 | ||
4780 | /* Come here only for records and arrays. */ | |
4781 | ||
d0f062fb | 4782 | if (COMPLETE_TYPE_P (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) |
400fbf9f | 4783 | { |
ab87f8c8 | 4784 | error_init ("variable-sized object may not be initialized"); |
400fbf9f JW |
4785 | return error_mark_node; |
4786 | } | |
4787 | ||
ab87f8c8 | 4788 | error_init ("invalid initializer"); |
400fbf9f JW |
4789 | return error_mark_node; |
4790 | } | |
4791 | \f | |
de520661 | 4792 | /* Handle initializers that use braces. */ |
400fbf9f | 4793 | |
de520661 RS |
4794 | /* Type of object we are accumulating a constructor for. |
4795 | This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */ | |
4796 | static tree constructor_type; | |
400fbf9f | 4797 | |
de520661 RS |
4798 | /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields |
4799 | left to fill. */ | |
4800 | static tree constructor_fields; | |
400fbf9f | 4801 | |
de520661 | 4802 | /* For an ARRAY_TYPE, this is the specified index |
665f2503 | 4803 | at which to store the next element we get. */ |
de520661 | 4804 | static tree constructor_index; |
400fbf9f | 4805 | |
de520661 RS |
4806 | /* For an ARRAY_TYPE, this is the maximum index. */ |
4807 | static tree constructor_max_index; | |
103b7b17 | 4808 | |
de520661 RS |
4809 | /* For a RECORD_TYPE, this is the first field not yet written out. */ |
4810 | static tree constructor_unfilled_fields; | |
400fbf9f | 4811 | |
de520661 | 4812 | /* For an ARRAY_TYPE, this is the index of the first element |
665f2503 | 4813 | not yet written out. */ |
de520661 RS |
4814 | static tree constructor_unfilled_index; |
4815 | ||
b62acd60 | 4816 | /* In a RECORD_TYPE, the byte index of the next consecutive field. |
665f2503 | 4817 | This is so we can generate gaps between fields, when appropriate. */ |
b62acd60 RS |
4818 | static tree constructor_bit_index; |
4819 | ||
de520661 RS |
4820 | /* If we are saving up the elements rather than allocating them, |
4821 | this is the list of elements so far (in reverse order, | |
4822 | most recent first). */ | |
4823 | static tree constructor_elements; | |
4824 | ||
8b6a5902 JJ |
4825 | /* 1 if constructor should be incrementally stored into a constructor chain, |
4826 | 0 if all the elements should be kept in AVL tree. */ | |
4827 | static int constructor_incremental; | |
4828 | ||
de520661 RS |
4829 | /* 1 if so far this constructor's elements are all compile-time constants. */ |
4830 | static int constructor_constant; | |
4831 | ||
4832 | /* 1 if so far this constructor's elements are all valid address constants. */ | |
4833 | static int constructor_simple; | |
4834 | ||
4835 | /* 1 if this constructor is erroneous so far. */ | |
4836 | static int constructor_erroneous; | |
4837 | ||
4838 | /* 1 if have called defer_addressed_constants. */ | |
4839 | static int constructor_subconstants_deferred; | |
4840 | ||
e5e809f4 JL |
4841 | /* Structure for managing pending initializer elements, organized as an |
4842 | AVL tree. */ | |
4843 | ||
4844 | struct init_node | |
4845 | { | |
4846 | struct init_node *left, *right; | |
4847 | struct init_node *parent; | |
4848 | int balance; | |
4849 | tree purpose; | |
4850 | tree value; | |
4851 | }; | |
4852 | ||
4853 | /* Tree of pending elements at this constructor level. | |
de520661 RS |
4854 | These are elements encountered out of order |
4855 | which belong at places we haven't reached yet in actually | |
4dd7201e ZW |
4856 | writing the output. |
4857 | Will never hold tree nodes across GC runs. */ | |
e5e809f4 | 4858 | static struct init_node *constructor_pending_elts; |
de520661 RS |
4859 | |
4860 | /* The SPELLING_DEPTH of this constructor. */ | |
4861 | static int constructor_depth; | |
4862 | ||
cc77d4d5 | 4863 | /* 0 if implicitly pushing constructor levels is allowed. */ |
0f41302f | 4864 | int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */ |
cc77d4d5 | 4865 | |
de520661 RS |
4866 | static int require_constant_value; |
4867 | static int require_constant_elements; | |
4868 | ||
de520661 RS |
4869 | /* DECL node for which an initializer is being read. |
4870 | 0 means we are reading a constructor expression | |
4871 | such as (struct foo) {...}. */ | |
4872 | static tree constructor_decl; | |
4873 | ||
4874 | /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */ | |
520a57c8 | 4875 | static const char *constructor_asmspec; |
de520661 RS |
4876 | |
4877 | /* Nonzero if this is an initializer for a top-level decl. */ | |
4878 | static int constructor_top_level; | |
4879 | ||
b621a4dd ZW |
4880 | /* Nonzero if there were any member designators in this initializer. */ |
4881 | static int constructor_designated; | |
4882 | ||
8b6a5902 JJ |
4883 | /* Nesting depth of designator list. */ |
4884 | static int designator_depth; | |
4885 | ||
4886 | /* Nonzero if there were diagnosed errors in this designator list. */ | |
4887 | static int designator_errorneous; | |
4888 | ||
b62acd60 RS |
4889 | \f |
4890 | /* This stack has a level for each implicit or explicit level of | |
4891 | structuring in the initializer, including the outermost one. It | |
4892 | saves the values of most of the variables above. */ | |
de520661 | 4893 | |
940ff66d JJ |
4894 | struct constructor_range_stack; |
4895 | ||
de520661 | 4896 | struct constructor_stack |
400fbf9f | 4897 | { |
de520661 RS |
4898 | struct constructor_stack *next; |
4899 | tree type; | |
4900 | tree fields; | |
4901 | tree index; | |
de520661 RS |
4902 | tree max_index; |
4903 | tree unfilled_index; | |
4904 | tree unfilled_fields; | |
b62acd60 | 4905 | tree bit_index; |
de520661 | 4906 | tree elements; |
e5e809f4 | 4907 | struct init_node *pending_elts; |
940ff66d | 4908 | int offset; |
de520661 | 4909 | int depth; |
790e9490 RS |
4910 | /* If nonzero, this value should replace the entire |
4911 | constructor at this level. */ | |
4912 | tree replacement_value; | |
940ff66d | 4913 | struct constructor_range_stack *range_stack; |
de520661 RS |
4914 | char constant; |
4915 | char simple; | |
4916 | char implicit; | |
de520661 RS |
4917 | char erroneous; |
4918 | char outer; | |
8b6a5902 | 4919 | char incremental; |
b621a4dd | 4920 | char designated; |
de520661 | 4921 | }; |
d45cf215 | 4922 | |
de520661 | 4923 | struct constructor_stack *constructor_stack; |
400fbf9f | 4924 | |
8b6a5902 JJ |
4925 | /* This stack represents designators from some range designator up to |
4926 | the last designator in the list. */ | |
4927 | ||
4928 | struct constructor_range_stack | |
4929 | { | |
4930 | struct constructor_range_stack *next, *prev; | |
4931 | struct constructor_stack *stack; | |
4932 | tree range_start; | |
4933 | tree index; | |
4934 | tree range_end; | |
4935 | tree fields; | |
4936 | }; | |
4937 | ||
4938 | struct constructor_range_stack *constructor_range_stack; | |
4939 | ||
de520661 RS |
4940 | /* This stack records separate initializers that are nested. |
4941 | Nested initializers can't happen in ANSI C, but GNU C allows them | |
4942 | in cases like { ... (struct foo) { ... } ... }. */ | |
400fbf9f | 4943 | |
de520661 RS |
4944 | struct initializer_stack |
4945 | { | |
4946 | struct initializer_stack *next; | |
4947 | tree decl; | |
520a57c8 | 4948 | const char *asmspec; |
de520661 | 4949 | struct constructor_stack *constructor_stack; |
8b6a5902 | 4950 | struct constructor_range_stack *constructor_range_stack; |
dea273df | 4951 | tree elements; |
de520661 RS |
4952 | struct spelling *spelling; |
4953 | struct spelling *spelling_base; | |
4954 | int spelling_size; | |
4955 | char top_level; | |
de520661 RS |
4956 | char require_constant_value; |
4957 | char require_constant_elements; | |
4958 | char deferred; | |
4959 | }; | |
4960 | ||
4961 | struct initializer_stack *initializer_stack; | |
4962 | \f | |
4963 | /* Prepare to parse and output the initializer for variable DECL. */ | |
4964 | ||
4965 | void | |
e28cae4f | 4966 | start_init (decl, asmspec_tree, top_level) |
de520661 | 4967 | tree decl; |
e28cae4f | 4968 | tree asmspec_tree; |
de520661 RS |
4969 | int top_level; |
4970 | { | |
5d5993dd | 4971 | const char *locus; |
de520661 RS |
4972 | struct initializer_stack *p |
4973 | = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack)); | |
520a57c8 | 4974 | const char *asmspec = 0; |
e28cae4f RS |
4975 | |
4976 | if (asmspec_tree) | |
4977 | asmspec = TREE_STRING_POINTER (asmspec_tree); | |
de520661 RS |
4978 | |
4979 | p->decl = constructor_decl; | |
4980 | p->asmspec = constructor_asmspec; | |
de520661 RS |
4981 | p->require_constant_value = require_constant_value; |
4982 | p->require_constant_elements = require_constant_elements; | |
4983 | p->constructor_stack = constructor_stack; | |
8b6a5902 | 4984 | p->constructor_range_stack = constructor_range_stack; |
dea273df | 4985 | p->elements = constructor_elements; |
de520661 RS |
4986 | p->spelling = spelling; |
4987 | p->spelling_base = spelling_base; | |
4988 | p->spelling_size = spelling_size; | |
4989 | p->deferred = constructor_subconstants_deferred; | |
4990 | p->top_level = constructor_top_level; | |
b62acd60 | 4991 | p->next = initializer_stack; |
de520661 RS |
4992 | initializer_stack = p; |
4993 | ||
4994 | constructor_decl = decl; | |
de520661 RS |
4995 | constructor_asmspec = asmspec; |
4996 | constructor_subconstants_deferred = 0; | |
b621a4dd | 4997 | constructor_designated = 0; |
de520661 RS |
4998 | constructor_top_level = top_level; |
4999 | ||
5000 | if (decl != 0) | |
3c3fa147 | 5001 | { |
de520661 | 5002 | require_constant_value = TREE_STATIC (decl); |
f1a2b955 | 5003 | require_constant_elements |
8b6a5902 | 5004 | = ((TREE_STATIC (decl) || (pedantic && !flag_isoc99)) |
f1a2b955 RS |
5005 | /* For a scalar, you can always use any value to initialize, |
5006 | even within braces. */ | |
5007 | && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
5008 | || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
5009 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
5010 | || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE)); | |
de520661 | 5011 | locus = IDENTIFIER_POINTER (DECL_NAME (decl)); |
3c3fa147 | 5012 | } |
400fbf9f | 5013 | else |
de520661 RS |
5014 | { |
5015 | require_constant_value = 0; | |
5016 | require_constant_elements = 0; | |
5017 | locus = "(anonymous)"; | |
5018 | } | |
400fbf9f | 5019 | |
de520661 | 5020 | constructor_stack = 0; |
8b6a5902 | 5021 | constructor_range_stack = 0; |
400fbf9f | 5022 | |
b71c7f8a RK |
5023 | missing_braces_mentioned = 0; |
5024 | ||
de520661 RS |
5025 | spelling_base = 0; |
5026 | spelling_size = 0; | |
5027 | RESTORE_SPELLING_DEPTH (0); | |
d45cf215 | 5028 | |
de520661 RS |
5029 | if (locus) |
5030 | push_string (locus); | |
5031 | } | |
400fbf9f | 5032 | |
de520661 RS |
5033 | void |
5034 | finish_init () | |
5035 | { | |
5036 | struct initializer_stack *p = initializer_stack; | |
400fbf9f | 5037 | |
de520661 RS |
5038 | /* Output subconstants (string constants, usually) |
5039 | that were referenced within this initializer and saved up. | |
5040 | Must do this if and only if we called defer_addressed_constants. */ | |
5041 | if (constructor_subconstants_deferred) | |
5042 | output_deferred_addressed_constants (); | |
4f77a31b | 5043 | |
de520661 RS |
5044 | /* Free the whole constructor stack of this initializer. */ |
5045 | while (constructor_stack) | |
5046 | { | |
5047 | struct constructor_stack *q = constructor_stack; | |
5048 | constructor_stack = q->next; | |
5049 | free (q); | |
5050 | } | |
400fbf9f | 5051 | |
8b6a5902 JJ |
5052 | if (constructor_range_stack) |
5053 | abort (); | |
5054 | ||
de520661 RS |
5055 | /* Pop back to the data of the outer initializer (if any). */ |
5056 | constructor_decl = p->decl; | |
5057 | constructor_asmspec = p->asmspec; | |
de520661 RS |
5058 | require_constant_value = p->require_constant_value; |
5059 | require_constant_elements = p->require_constant_elements; | |
5060 | constructor_stack = p->constructor_stack; | |
8b6a5902 | 5061 | constructor_range_stack = p->constructor_range_stack; |
dea273df | 5062 | constructor_elements = p->elements; |
de520661 RS |
5063 | spelling = p->spelling; |
5064 | spelling_base = p->spelling_base; | |
5065 | spelling_size = p->spelling_size; | |
5066 | constructor_subconstants_deferred = p->deferred; | |
5067 | constructor_top_level = p->top_level; | |
5068 | initializer_stack = p->next; | |
5069 | free (p); | |
5070 | } | |
5071 | \f | |
5072 | /* Call here when we see the initializer is surrounded by braces. | |
5073 | This is instead of a call to push_init_level; | |
5074 | it is matched by a call to pop_init_level. | |
400fbf9f | 5075 | |
de520661 RS |
5076 | TYPE is the type to initialize, for a constructor expression. |
5077 | For an initializer for a decl, TYPE is zero. */ | |
5a7ec9d9 | 5078 | |
de520661 RS |
5079 | void |
5080 | really_start_incremental_init (type) | |
5081 | tree type; | |
5082 | { | |
5083 | struct constructor_stack *p | |
5084 | = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); | |
5085 | ||
5086 | if (type == 0) | |
5087 | type = TREE_TYPE (constructor_decl); | |
5088 | ||
de520661 RS |
5089 | p->type = constructor_type; |
5090 | p->fields = constructor_fields; | |
5091 | p->index = constructor_index; | |
de520661 RS |
5092 | p->max_index = constructor_max_index; |
5093 | p->unfilled_index = constructor_unfilled_index; | |
5094 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5095 | p->bit_index = constructor_bit_index; |
5cb7368c | 5096 | p->elements = constructor_elements; |
de520661 RS |
5097 | p->constant = constructor_constant; |
5098 | p->simple = constructor_simple; | |
5099 | p->erroneous = constructor_erroneous; | |
5100 | p->pending_elts = constructor_pending_elts; | |
5101 | p->depth = constructor_depth; | |
790e9490 | 5102 | p->replacement_value = 0; |
de520661 | 5103 | p->implicit = 0; |
940ff66d | 5104 | p->range_stack = 0; |
de520661 | 5105 | p->outer = 0; |
8b6a5902 | 5106 | p->incremental = constructor_incremental; |
b621a4dd | 5107 | p->designated = constructor_designated; |
de520661 RS |
5108 | p->next = 0; |
5109 | constructor_stack = p; | |
5110 | ||
5111 | constructor_constant = 1; | |
5112 | constructor_simple = 1; | |
5113 | constructor_depth = SPELLING_DEPTH (); | |
5114 | constructor_elements = 0; | |
5115 | constructor_pending_elts = 0; | |
5116 | constructor_type = type; | |
8b6a5902 | 5117 | constructor_incremental = 1; |
b621a4dd | 5118 | constructor_designated = 0; |
8b6a5902 JJ |
5119 | designator_depth = 0; |
5120 | designator_errorneous = 0; | |
de520661 RS |
5121 | |
5122 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5123 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5124 | { | |
5125 | constructor_fields = TYPE_FIELDS (constructor_type); | |
abc95ed3 | 5126 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 | 5127 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) |
fc623854 RS |
5128 | && DECL_NAME (constructor_fields) == 0) |
5129 | constructor_fields = TREE_CHAIN (constructor_fields); | |
665f2503 | 5130 | |
de520661 | 5131 | constructor_unfilled_fields = constructor_fields; |
770ae6cc | 5132 | constructor_bit_index = bitsize_zero_node; |
de520661 RS |
5133 | } |
5134 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5135 | { | |
de520661 | 5136 | if (TYPE_DOMAIN (constructor_type)) |
2bede729 PB |
5137 | { |
5138 | constructor_max_index | |
5139 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
ffc5c6a9 RH |
5140 | |
5141 | /* Detect non-empty initializations of zero-length arrays. */ | |
e7b6a0ee DD |
5142 | if (constructor_max_index == NULL_TREE |
5143 | && TYPE_SIZE (constructor_type)) | |
ffc5c6a9 RH |
5144 | constructor_max_index = build_int_2 (-1, -1); |
5145 | ||
39bc99c2 JM |
5146 | /* constructor_max_index needs to be an INTEGER_CST. Attempts |
5147 | to initialize VLAs will cause an proper error; avoid tree | |
5148 | checking errors as well by setting a safe value. */ | |
5149 | if (constructor_max_index | |
5150 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
5151 | constructor_max_index = build_int_2 (-1, -1); | |
5152 | ||
2bede729 | 5153 | constructor_index |
665f2503 RK |
5154 | = convert (bitsizetype, |
5155 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
2bede729 PB |
5156 | } |
5157 | else | |
770ae6cc | 5158 | constructor_index = bitsize_zero_node; |
fed3cef0 | 5159 | |
665f2503 | 5160 | constructor_unfilled_index = constructor_index; |
de520661 | 5161 | } |
e6834654 SS |
5162 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) |
5163 | { | |
5164 | /* Vectors are like simple fixed-size arrays. */ | |
5165 | constructor_max_index = | |
5166 | build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0); | |
b7997284 | 5167 | constructor_index = convert (bitsizetype, bitsize_zero_node); |
e6834654 SS |
5168 | constructor_unfilled_index = constructor_index; |
5169 | } | |
de520661 RS |
5170 | else |
5171 | { | |
5172 | /* Handle the case of int x = {5}; */ | |
5173 | constructor_fields = constructor_type; | |
5174 | constructor_unfilled_fields = constructor_type; | |
5175 | } | |
de520661 RS |
5176 | } |
5177 | \f | |
5178 | /* Push down into a subobject, for initialization. | |
5179 | If this is for an explicit set of braces, IMPLICIT is 0. | |
5180 | If it is because the next element belongs at a lower level, | |
8b6a5902 | 5181 | IMPLICIT is 1 (or 2 if the push is because of designator list). */ |
400fbf9f | 5182 | |
de520661 RS |
5183 | void |
5184 | push_init_level (implicit) | |
5185 | int implicit; | |
5186 | { | |
94ba5069 | 5187 | struct constructor_stack *p; |
8b6a5902 | 5188 | tree value = NULL_TREE; |
94ba5069 RS |
5189 | |
5190 | /* If we've exhausted any levels that didn't have braces, | |
5191 | pop them now. */ | |
5192 | while (constructor_stack->implicit) | |
5193 | { | |
5194 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5195 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5196 | && constructor_fields == 0) | |
5197 | process_init_element (pop_init_level (1)); | |
5198 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5199 | && tree_int_cst_lt (constructor_max_index, constructor_index)) | |
5200 | process_init_element (pop_init_level (1)); | |
5201 | else | |
5202 | break; | |
5203 | } | |
5204 | ||
8b6a5902 JJ |
5205 | /* Unless this is an explicit brace, we need to preserve previous |
5206 | content if any. */ | |
5207 | if (implicit) | |
5208 | { | |
5209 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5210 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5211 | && constructor_fields) | |
5212 | value = find_init_member (constructor_fields); | |
5213 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5214 | value = find_init_member (constructor_index); | |
5215 | } | |
5216 | ||
94ba5069 | 5217 | p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); |
de520661 RS |
5218 | p->type = constructor_type; |
5219 | p->fields = constructor_fields; | |
5220 | p->index = constructor_index; | |
de520661 RS |
5221 | p->max_index = constructor_max_index; |
5222 | p->unfilled_index = constructor_unfilled_index; | |
5223 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5224 | p->bit_index = constructor_bit_index; |
de520661 RS |
5225 | p->elements = constructor_elements; |
5226 | p->constant = constructor_constant; | |
5227 | p->simple = constructor_simple; | |
5228 | p->erroneous = constructor_erroneous; | |
5229 | p->pending_elts = constructor_pending_elts; | |
5230 | p->depth = constructor_depth; | |
790e9490 | 5231 | p->replacement_value = 0; |
de520661 | 5232 | p->implicit = implicit; |
de520661 | 5233 | p->outer = 0; |
8b6a5902 | 5234 | p->incremental = constructor_incremental; |
b621a4dd | 5235 | p->designated = constructor_designated; |
de520661 | 5236 | p->next = constructor_stack; |
940ff66d | 5237 | p->range_stack = 0; |
de520661 RS |
5238 | constructor_stack = p; |
5239 | ||
5240 | constructor_constant = 1; | |
5241 | constructor_simple = 1; | |
5242 | constructor_depth = SPELLING_DEPTH (); | |
5243 | constructor_elements = 0; | |
8b6a5902 | 5244 | constructor_incremental = 1; |
b621a4dd | 5245 | constructor_designated = 0; |
de520661 | 5246 | constructor_pending_elts = 0; |
8b6a5902 JJ |
5247 | if (!implicit) |
5248 | { | |
940ff66d JJ |
5249 | p->range_stack = constructor_range_stack; |
5250 | constructor_range_stack = 0; | |
8b6a5902 JJ |
5251 | designator_depth = 0; |
5252 | designator_errorneous = 0; | |
5253 | } | |
de520661 | 5254 | |
94ba5069 RS |
5255 | /* Don't die if an entire brace-pair level is superfluous |
5256 | in the containing level. */ | |
5257 | if (constructor_type == 0) | |
5258 | ; | |
5259 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5260 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
de520661 | 5261 | { |
91fa3c30 RS |
5262 | /* Don't die if there are extra init elts at the end. */ |
5263 | if (constructor_fields == 0) | |
5264 | constructor_type = 0; | |
5265 | else | |
5266 | { | |
5267 | constructor_type = TREE_TYPE (constructor_fields); | |
19d76e60 | 5268 | push_member_name (constructor_fields); |
e4376e63 | 5269 | constructor_depth++; |
91fa3c30 | 5270 | } |
de520661 RS |
5271 | } |
5272 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5273 | { | |
5274 | constructor_type = TREE_TYPE (constructor_type); | |
665f2503 | 5275 | push_array_bounds (tree_low_cst (constructor_index, 0)); |
e4376e63 | 5276 | constructor_depth++; |
de520661 | 5277 | } |
400fbf9f | 5278 | |
91fa3c30 RS |
5279 | if (constructor_type == 0) |
5280 | { | |
ab87f8c8 | 5281 | error_init ("extra brace group at end of initializer"); |
91fa3c30 RS |
5282 | constructor_fields = 0; |
5283 | constructor_unfilled_fields = 0; | |
b71c7f8a | 5284 | return; |
91fa3c30 | 5285 | } |
b71c7f8a | 5286 | |
8b6a5902 JJ |
5287 | if (value && TREE_CODE (value) == CONSTRUCTOR) |
5288 | { | |
5289 | constructor_constant = TREE_CONSTANT (value); | |
5290 | constructor_simple = TREE_STATIC (value); | |
5291 | constructor_elements = TREE_OPERAND (value, 1); | |
5292 | if (constructor_elements | |
5293 | && (TREE_CODE (constructor_type) == RECORD_TYPE | |
5294 | || TREE_CODE (constructor_type) == ARRAY_TYPE)) | |
5295 | set_nonincremental_init (); | |
5296 | } | |
5297 | ||
5298 | if (implicit == 1 && warn_missing_braces && !missing_braces_mentioned) | |
b71c7f8a RK |
5299 | { |
5300 | missing_braces_mentioned = 1; | |
ab87f8c8 | 5301 | warning_init ("missing braces around initializer"); |
b71c7f8a RK |
5302 | } |
5303 | ||
5304 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
91fa3c30 | 5305 | || TREE_CODE (constructor_type) == UNION_TYPE) |
de520661 RS |
5306 | { |
5307 | constructor_fields = TYPE_FIELDS (constructor_type); | |
abc95ed3 | 5308 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 | 5309 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) |
fc623854 RS |
5310 | && DECL_NAME (constructor_fields) == 0) |
5311 | constructor_fields = TREE_CHAIN (constructor_fields); | |
665f2503 | 5312 | |
de520661 | 5313 | constructor_unfilled_fields = constructor_fields; |
770ae6cc | 5314 | constructor_bit_index = bitsize_zero_node; |
de520661 | 5315 | } |
6786d201 AH |
5316 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) |
5317 | { | |
5318 | /* Vectors are like simple fixed-size arrays. */ | |
5319 | constructor_max_index = | |
5320 | build_int_2 (TYPE_VECTOR_SUBPARTS (constructor_type) - 1, 0); | |
5321 | constructor_index = convert (bitsizetype, integer_zero_node); | |
5322 | constructor_unfilled_index = constructor_index; | |
5323 | } | |
de520661 RS |
5324 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
5325 | { | |
de520661 | 5326 | if (TYPE_DOMAIN (constructor_type)) |
2bede729 PB |
5327 | { |
5328 | constructor_max_index | |
5329 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
e7b6a0ee DD |
5330 | |
5331 | /* Detect non-empty initializations of zero-length arrays. */ | |
5332 | if (constructor_max_index == NULL_TREE | |
5333 | && TYPE_SIZE (constructor_type)) | |
5334 | constructor_max_index = build_int_2 (-1, -1); | |
39bc99c2 JM |
5335 | |
5336 | /* constructor_max_index needs to be an INTEGER_CST. Attempts | |
5337 | to initialize VLAs will cause an proper error; avoid tree | |
5338 | checking errors as well by setting a safe value. */ | |
5339 | if (constructor_max_index | |
5340 | && TREE_CODE (constructor_max_index) != INTEGER_CST) | |
5341 | constructor_max_index = build_int_2 (-1, -1); | |
e7b6a0ee | 5342 | |
2bede729 | 5343 | constructor_index |
665f2503 | 5344 | = convert (bitsizetype, |
584ef5fe | 5345 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); |
2bede729 PB |
5346 | } |
5347 | else | |
770ae6cc | 5348 | constructor_index = bitsize_zero_node; |
fed3cef0 | 5349 | |
665f2503 | 5350 | constructor_unfilled_index = constructor_index; |
8b6a5902 JJ |
5351 | if (value && TREE_CODE (value) == STRING_CST) |
5352 | { | |
5353 | /* We need to split the char/wchar array into individual | |
5354 | characters, so that we don't have to special case it | |
5355 | everywhere. */ | |
5356 | set_nonincremental_init_from_string (value); | |
5357 | } | |
de520661 RS |
5358 | } |
5359 | else | |
5360 | { | |
ab87f8c8 | 5361 | warning_init ("braces around scalar initializer"); |
de520661 RS |
5362 | constructor_fields = constructor_type; |
5363 | constructor_unfilled_fields = constructor_type; | |
5364 | } | |
5365 | } | |
400fbf9f | 5366 | |
de520661 RS |
5367 | /* At the end of an implicit or explicit brace level, |
5368 | finish up that level of constructor. | |
5369 | If we were outputting the elements as they are read, return 0 | |
5370 | from inner levels (process_init_element ignores that), | |
5371 | but return error_mark_node from the outermost level | |
5372 | (that's what we want to put in DECL_INITIAL). | |
5373 | Otherwise, return a CONSTRUCTOR expression. */ | |
5374 | ||
5375 | tree | |
5376 | pop_init_level (implicit) | |
5377 | int implicit; | |
5378 | { | |
5379 | struct constructor_stack *p; | |
de520661 RS |
5380 | tree constructor = 0; |
5381 | ||
5382 | if (implicit == 0) | |
400fbf9f | 5383 | { |
de520661 RS |
5384 | /* When we come to an explicit close brace, |
5385 | pop any inner levels that didn't have explicit braces. */ | |
5386 | while (constructor_stack->implicit) | |
5387 | process_init_element (pop_init_level (1)); | |
940ff66d JJ |
5388 | |
5389 | if (constructor_range_stack) | |
5390 | abort (); | |
de520661 | 5391 | } |
400fbf9f | 5392 | |
de520661 | 5393 | p = constructor_stack; |
91fa3c30 | 5394 | |
584ef5fe RH |
5395 | /* Error for initializing a flexible array member, or a zero-length |
5396 | array member in an inappropriate context. */ | |
ffc5c6a9 | 5397 | if (constructor_type && constructor_fields |
584ef5fe RH |
5398 | && TREE_CODE (constructor_type) == ARRAY_TYPE |
5399 | && TYPE_DOMAIN (constructor_type) | |
5400 | && ! TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type))) | |
5401 | { | |
ffc5c6a9 RH |
5402 | /* Silently discard empty initializations. The parser will |
5403 | already have pedwarned for empty brackets. */ | |
5404 | if (integer_zerop (constructor_unfilled_index)) | |
5405 | constructor_type = NULL_TREE; | |
5406 | else if (! TYPE_SIZE (constructor_type)) | |
5407 | { | |
5408 | if (constructor_depth > 2) | |
5409 | error_init ("initialization of flexible array member in a nested context"); | |
5410 | else if (pedantic) | |
5411 | pedwarn_init ("initialization of a flexible array member"); | |
5412 | ||
ff7cc307 | 5413 | /* We have already issued an error message for the existence |
ffc5c6a9 RH |
5414 | of a flexible array member not at the end of the structure. |
5415 | Discard the initializer so that we do not abort later. */ | |
5416 | if (TREE_CHAIN (constructor_fields) != NULL_TREE) | |
5417 | constructor_type = NULL_TREE; | |
5418 | } | |
5419 | else | |
e7b6a0ee DD |
5420 | /* Zero-length arrays are no longer special, so we should no longer |
5421 | get here. */ | |
505ddab6 | 5422 | abort (); |
584ef5fe RH |
5423 | } |
5424 | ||
9dfcc8db BH |
5425 | /* Warn when some struct elements are implicitly initialized to zero. */ |
5426 | if (extra_warnings | |
5427 | && constructor_type | |
5428 | && TREE_CODE (constructor_type) == RECORD_TYPE | |
5429 | && constructor_unfilled_fields) | |
5430 | { | |
8b6a5902 JJ |
5431 | /* Do not warn for flexible array members or zero-length arrays. */ |
5432 | while (constructor_unfilled_fields | |
5433 | && (! DECL_SIZE (constructor_unfilled_fields) | |
5434 | || integer_zerop (DECL_SIZE (constructor_unfilled_fields)))) | |
5435 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
ffc5c6a9 | 5436 | |
b621a4dd ZW |
5437 | /* Do not warn if this level of the initializer uses member |
5438 | designators; it is likely to be deliberate. */ | |
5439 | if (constructor_unfilled_fields && !constructor_designated) | |
8b6a5902 JJ |
5440 | { |
5441 | push_member_name (constructor_unfilled_fields); | |
5442 | warning_init ("missing initializer"); | |
5443 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
5444 | } | |
9dfcc8db BH |
5445 | } |
5446 | ||
de520661 | 5447 | /* Now output all pending elements. */ |
8b6a5902 | 5448 | constructor_incremental = 1; |
de520661 RS |
5449 | output_pending_init_elements (1); |
5450 | ||
5451 | /* Pad out the end of the structure. */ | |
790e9490 | 5452 | if (p->replacement_value) |
229a2e65 MM |
5453 | /* If this closes a superfluous brace pair, |
5454 | just pass out the element between them. */ | |
5455 | constructor = p->replacement_value; | |
91fa3c30 RS |
5456 | else if (constructor_type == 0) |
5457 | ; | |
19d76e60 RK |
5458 | else if (TREE_CODE (constructor_type) != RECORD_TYPE |
5459 | && TREE_CODE (constructor_type) != UNION_TYPE | |
e6834654 SS |
5460 | && TREE_CODE (constructor_type) != ARRAY_TYPE |
5461 | && TREE_CODE (constructor_type) != VECTOR_TYPE) | |
19d76e60 RK |
5462 | { |
5463 | /* A nonincremental scalar initializer--just return | |
5464 | the element, after verifying there is just one. */ | |
5465 | if (constructor_elements == 0) | |
5466 | { | |
8b6a5902 JJ |
5467 | if (!constructor_erroneous) |
5468 | error_init ("empty scalar initializer"); | |
19d76e60 RK |
5469 | constructor = error_mark_node; |
5470 | } | |
5471 | else if (TREE_CHAIN (constructor_elements) != 0) | |
5472 | { | |
ab87f8c8 | 5473 | error_init ("extra elements in scalar initializer"); |
19d76e60 RK |
5474 | constructor = TREE_VALUE (constructor_elements); |
5475 | } | |
5476 | else | |
5477 | constructor = TREE_VALUE (constructor_elements); | |
5478 | } | |
229a2e65 | 5479 | else |
de520661 RS |
5480 | { |
5481 | if (constructor_erroneous) | |
5482 | constructor = error_mark_node; | |
5483 | else | |
400fbf9f | 5484 | { |
de520661 RS |
5485 | constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE, |
5486 | nreverse (constructor_elements)); | |
5487 | if (constructor_constant) | |
5488 | TREE_CONSTANT (constructor) = 1; | |
5489 | if (constructor_constant && constructor_simple) | |
5490 | TREE_STATIC (constructor) = 1; | |
de520661 RS |
5491 | } |
5492 | } | |
de520661 | 5493 | |
de520661 RS |
5494 | constructor_type = p->type; |
5495 | constructor_fields = p->fields; | |
5496 | constructor_index = p->index; | |
de520661 RS |
5497 | constructor_max_index = p->max_index; |
5498 | constructor_unfilled_index = p->unfilled_index; | |
5499 | constructor_unfilled_fields = p->unfilled_fields; | |
b62acd60 | 5500 | constructor_bit_index = p->bit_index; |
de520661 RS |
5501 | constructor_elements = p->elements; |
5502 | constructor_constant = p->constant; | |
5503 | constructor_simple = p->simple; | |
5504 | constructor_erroneous = p->erroneous; | |
8b6a5902 | 5505 | constructor_incremental = p->incremental; |
b621a4dd | 5506 | constructor_designated = p->designated; |
de520661 RS |
5507 | constructor_pending_elts = p->pending_elts; |
5508 | constructor_depth = p->depth; | |
940ff66d JJ |
5509 | if (!p->implicit) |
5510 | constructor_range_stack = p->range_stack; | |
de520661 RS |
5511 | RESTORE_SPELLING_DEPTH (constructor_depth); |
5512 | ||
5513 | constructor_stack = p->next; | |
5514 | free (p); | |
5515 | ||
5516 | if (constructor == 0) | |
5517 | { | |
5518 | if (constructor_stack == 0) | |
5519 | return error_mark_node; | |
5520 | return NULL_TREE; | |
5521 | } | |
5522 | return constructor; | |
5523 | } | |
5524 | ||
8b6a5902 JJ |
5525 | /* Common handling for both array range and field name designators. |
5526 | ARRAY argument is non-zero for array ranges. Returns zero for success. */ | |
5527 | ||
5528 | static int | |
5529 | set_designator (array) | |
5530 | int array; | |
5531 | { | |
5532 | tree subtype; | |
5533 | enum tree_code subcode; | |
5534 | ||
5535 | /* Don't die if an entire brace-pair level is superfluous | |
5536 | in the containing level. */ | |
5537 | if (constructor_type == 0) | |
5538 | return 1; | |
5539 | ||
5540 | /* If there were errors in this designator list already, bail out silently. */ | |
5541 | if (designator_errorneous) | |
5542 | return 1; | |
5543 | ||
5544 | if (!designator_depth) | |
5545 | { | |
5546 | if (constructor_range_stack) | |
5547 | abort (); | |
5548 | ||
5549 | /* Designator list starts at the level of closest explicit | |
5550 | braces. */ | |
5551 | while (constructor_stack->implicit) | |
5552 | process_init_element (pop_init_level (1)); | |
b621a4dd | 5553 | constructor_designated = 1; |
8b6a5902 JJ |
5554 | return 0; |
5555 | } | |
5556 | ||
5557 | if (constructor_no_implicit) | |
5558 | { | |
5559 | error_init ("initialization designators may not nest"); | |
5560 | return 1; | |
5561 | } | |
5562 | ||
5563 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5564 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5565 | { | |
5566 | subtype = TREE_TYPE (constructor_fields); | |
5567 | if (subtype != error_mark_node) | |
5568 | subtype = TYPE_MAIN_VARIANT (subtype); | |
5569 | } | |
5570 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5571 | { | |
5572 | subtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
5573 | } | |
5574 | else | |
5575 | abort (); | |
5576 | ||
5577 | subcode = TREE_CODE (subtype); | |
5578 | if (array && subcode != ARRAY_TYPE) | |
5579 | { | |
5580 | error_init ("array index in non-array initializer"); | |
5581 | return 1; | |
5582 | } | |
5583 | else if (!array && subcode != RECORD_TYPE && subcode != UNION_TYPE) | |
5584 | { | |
5585 | error_init ("field name not in record or union initializer"); | |
5586 | return 1; | |
5587 | } | |
5588 | ||
b621a4dd | 5589 | constructor_designated = 1; |
8b6a5902 JJ |
5590 | push_init_level (2); |
5591 | return 0; | |
5592 | } | |
5593 | ||
5594 | /* If there are range designators in designator list, push a new designator | |
5595 | to constructor_range_stack. RANGE_END is end of such stack range or | |
5596 | NULL_TREE if there is no range designator at this level. */ | |
5597 | ||
5598 | static void | |
5599 | push_range_stack (range_end) | |
5600 | tree range_end; | |
5601 | { | |
5602 | struct constructor_range_stack *p; | |
5603 | ||
5604 | p = (struct constructor_range_stack *) | |
5605 | ggc_alloc (sizeof (struct constructor_range_stack)); | |
5606 | p->prev = constructor_range_stack; | |
5607 | p->next = 0; | |
5608 | p->fields = constructor_fields; | |
5609 | p->range_start = constructor_index; | |
5610 | p->index = constructor_index; | |
5611 | p->stack = constructor_stack; | |
5612 | p->range_end = range_end; | |
5613 | if (constructor_range_stack) | |
5614 | constructor_range_stack->next = p; | |
5615 | constructor_range_stack = p; | |
5616 | } | |
5617 | ||
de520661 RS |
5618 | /* Within an array initializer, specify the next index to be initialized. |
5619 | FIRST is that index. If LAST is nonzero, then initialize a range | |
5620 | of indices, running from FIRST through LAST. */ | |
5621 | ||
5622 | void | |
5623 | set_init_index (first, last) | |
5624 | tree first, last; | |
5625 | { | |
8b6a5902 JJ |
5626 | if (set_designator (1)) |
5627 | return; | |
5628 | ||
5629 | designator_errorneous = 1; | |
5630 | ||
19d76e60 RK |
5631 | while ((TREE_CODE (first) == NOP_EXPR |
5632 | || TREE_CODE (first) == CONVERT_EXPR | |
5633 | || TREE_CODE (first) == NON_LVALUE_EXPR) | |
5634 | && (TYPE_MODE (TREE_TYPE (first)) | |
5635 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0))))) | |
665f2503 RK |
5636 | first = TREE_OPERAND (first, 0); |
5637 | ||
19d76e60 RK |
5638 | if (last) |
5639 | while ((TREE_CODE (last) == NOP_EXPR | |
5640 | || TREE_CODE (last) == CONVERT_EXPR | |
5641 | || TREE_CODE (last) == NON_LVALUE_EXPR) | |
5642 | && (TYPE_MODE (TREE_TYPE (last)) | |
5643 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0))))) | |
665f2503 | 5644 | last = TREE_OPERAND (last, 0); |
19d76e60 | 5645 | |
94ba5069 | 5646 | if (TREE_CODE (first) != INTEGER_CST) |
ab87f8c8 | 5647 | error_init ("nonconstant array index in initializer"); |
94ba5069 | 5648 | else if (last != 0 && TREE_CODE (last) != INTEGER_CST) |
ab87f8c8 | 5649 | error_init ("nonconstant array index in initializer"); |
8b6a5902 | 5650 | else if (TREE_CODE (constructor_type) != ARRAY_TYPE) |
ab87f8c8 | 5651 | error_init ("array index in non-array initializer"); |
8b6a5902 JJ |
5652 | else if (constructor_max_index |
5653 | && tree_int_cst_lt (constructor_max_index, first)) | |
5654 | error_init ("array index in initializer exceeds array bounds"); | |
de520661 RS |
5655 | else |
5656 | { | |
665f2503 | 5657 | constructor_index = convert (bitsizetype, first); |
de520661 | 5658 | |
ce662d4c | 5659 | if (last) |
8b6a5902 | 5660 | { |
ce662d4c JJ |
5661 | if (tree_int_cst_equal (first, last)) |
5662 | last = 0; | |
5663 | else if (tree_int_cst_lt (last, first)) | |
8b6a5902 | 5664 | { |
ce662d4c | 5665 | error_init ("empty index range in initializer"); |
8b6a5902 JJ |
5666 | last = 0; |
5667 | } | |
ce662d4c JJ |
5668 | else |
5669 | { | |
5670 | last = convert (bitsizetype, last); | |
5671 | if (constructor_max_index != 0 | |
5672 | && tree_int_cst_lt (constructor_max_index, last)) | |
5673 | { | |
5674 | error_init ("array index range in initializer exceeds array bounds"); | |
5675 | last = 0; | |
5676 | } | |
5677 | } | |
8b6a5902 | 5678 | } |
ce662d4c | 5679 | |
8b6a5902 JJ |
5680 | designator_depth++; |
5681 | designator_errorneous = 0; | |
5682 | if (constructor_range_stack || last) | |
5683 | push_range_stack (last); | |
de520661 RS |
5684 | } |
5685 | } | |
5686 | ||
5687 | /* Within a struct initializer, specify the next field to be initialized. */ | |
5688 | ||
94ba5069 | 5689 | void |
de520661 RS |
5690 | set_init_label (fieldname) |
5691 | tree fieldname; | |
5692 | { | |
5693 | tree tail; | |
de520661 | 5694 | |
8b6a5902 | 5695 | if (set_designator (0)) |
e5cfb88f RK |
5696 | return; |
5697 | ||
8b6a5902 JJ |
5698 | designator_errorneous = 1; |
5699 | ||
5700 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5701 | && TREE_CODE (constructor_type) != UNION_TYPE) | |
5702 | { | |
5703 | error_init ("field name not in record or union initializer"); | |
5704 | return; | |
5705 | } | |
5706 | ||
de520661 RS |
5707 | for (tail = TYPE_FIELDS (constructor_type); tail; |
5708 | tail = TREE_CHAIN (tail)) | |
5709 | { | |
de520661 RS |
5710 | if (DECL_NAME (tail) == fieldname) |
5711 | break; | |
5712 | } | |
5713 | ||
5714 | if (tail == 0) | |
5715 | error ("unknown field `%s' specified in initializer", | |
5716 | IDENTIFIER_POINTER (fieldname)); | |
de520661 | 5717 | else |
8b6a5902 JJ |
5718 | { |
5719 | constructor_fields = tail; | |
5720 | designator_depth++; | |
5721 | designator_errorneous = 0; | |
5722 | if (constructor_range_stack) | |
5723 | push_range_stack (NULL_TREE); | |
5724 | } | |
de520661 RS |
5725 | } |
5726 | \f | |
e5e809f4 | 5727 | /* Add a new initializer to the tree of pending initializers. PURPOSE |
684d9f3b | 5728 | identifies the initializer, either array index or field in a structure. |
e5e809f4 JL |
5729 | VALUE is the value of that index or field. */ |
5730 | ||
5731 | static void | |
5732 | add_pending_init (purpose, value) | |
5733 | tree purpose, value; | |
5734 | { | |
5735 | struct init_node *p, **q, *r; | |
5736 | ||
5737 | q = &constructor_pending_elts; | |
5738 | p = 0; | |
5739 | ||
5740 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5741 | { | |
5742 | while (*q != 0) | |
5743 | { | |
5744 | p = *q; | |
5745 | if (tree_int_cst_lt (purpose, p->purpose)) | |
5746 | q = &p->left; | |
8b6a5902 | 5747 | else if (tree_int_cst_lt (p->purpose, purpose)) |
e5e809f4 JL |
5748 | q = &p->right; |
5749 | else | |
8b6a5902 JJ |
5750 | { |
5751 | if (TREE_SIDE_EFFECTS (p->value)) | |
5752 | warning_init ("initialized field with side-effects overwritten"); | |
5753 | p->value = value; | |
5754 | return; | |
5755 | } | |
e5e809f4 JL |
5756 | } |
5757 | } | |
5758 | else | |
5759 | { | |
8b6a5902 JJ |
5760 | tree bitpos; |
5761 | ||
5762 | bitpos = bit_position (purpose); | |
e5e809f4 JL |
5763 | while (*q != NULL) |
5764 | { | |
5765 | p = *q; | |
8b6a5902 | 5766 | if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) |
e5e809f4 | 5767 | q = &p->left; |
83b091c7 | 5768 | else if (p->purpose != purpose) |
e5e809f4 JL |
5769 | q = &p->right; |
5770 | else | |
8b6a5902 JJ |
5771 | { |
5772 | if (TREE_SIDE_EFFECTS (p->value)) | |
5773 | warning_init ("initialized field with side-effects overwritten"); | |
5774 | p->value = value; | |
5775 | return; | |
5776 | } | |
e5e809f4 JL |
5777 | } |
5778 | } | |
5779 | ||
f8a83ee3 | 5780 | r = (struct init_node *) ggc_alloc (sizeof (struct init_node)); |
e5e809f4 JL |
5781 | r->purpose = purpose; |
5782 | r->value = value; | |
5783 | ||
5784 | *q = r; | |
5785 | r->parent = p; | |
5786 | r->left = 0; | |
5787 | r->right = 0; | |
5788 | r->balance = 0; | |
5789 | ||
5790 | while (p) | |
5791 | { | |
5792 | struct init_node *s; | |
5793 | ||
5794 | if (r == p->left) | |
5795 | { | |
5796 | if (p->balance == 0) | |
5797 | p->balance = -1; | |
5798 | else if (p->balance < 0) | |
5799 | { | |
5800 | if (r->balance < 0) | |
5801 | { | |
ec5c56db | 5802 | /* L rotation. */ |
e5e809f4 JL |
5803 | p->left = r->right; |
5804 | if (p->left) | |
5805 | p->left->parent = p; | |
5806 | r->right = p; | |
5807 | ||
5808 | p->balance = 0; | |
5809 | r->balance = 0; | |
5810 | ||
5811 | s = p->parent; | |
5812 | p->parent = r; | |
5813 | r->parent = s; | |
5814 | if (s) | |
5815 | { | |
5816 | if (s->left == p) | |
5817 | s->left = r; | |
5818 | else | |
5819 | s->right = r; | |
5820 | } | |
5821 | else | |
5822 | constructor_pending_elts = r; | |
5823 | } | |
5824 | else | |
5825 | { | |
ec5c56db | 5826 | /* LR rotation. */ |
e5e809f4 JL |
5827 | struct init_node *t = r->right; |
5828 | ||
5829 | r->right = t->left; | |
5830 | if (r->right) | |
5831 | r->right->parent = r; | |
5832 | t->left = r; | |
5833 | ||
5834 | p->left = t->right; | |
5835 | if (p->left) | |
5836 | p->left->parent = p; | |
5837 | t->right = p; | |
5838 | ||
5839 | p->balance = t->balance < 0; | |
5840 | r->balance = -(t->balance > 0); | |
5841 | t->balance = 0; | |
5842 | ||
5843 | s = p->parent; | |
5844 | p->parent = t; | |
5845 | r->parent = t; | |
5846 | t->parent = s; | |
5847 | if (s) | |
5848 | { | |
5849 | if (s->left == p) | |
5850 | s->left = t; | |
5851 | else | |
5852 | s->right = t; | |
5853 | } | |
5854 | else | |
5855 | constructor_pending_elts = t; | |
5856 | } | |
5857 | break; | |
5858 | } | |
5859 | else | |
5860 | { | |
5861 | /* p->balance == +1; growth of left side balances the node. */ | |
5862 | p->balance = 0; | |
5863 | break; | |
5864 | } | |
5865 | } | |
5866 | else /* r == p->right */ | |
5867 | { | |
5868 | if (p->balance == 0) | |
5869 | /* Growth propagation from right side. */ | |
5870 | p->balance++; | |
5871 | else if (p->balance > 0) | |
5872 | { | |
5873 | if (r->balance > 0) | |
5874 | { | |
ec5c56db | 5875 | /* R rotation. */ |
e5e809f4 JL |
5876 | p->right = r->left; |
5877 | if (p->right) | |
5878 | p->right->parent = p; | |
5879 | r->left = p; | |
5880 | ||
5881 | p->balance = 0; | |
5882 | r->balance = 0; | |
5883 | ||
5884 | s = p->parent; | |
5885 | p->parent = r; | |
5886 | r->parent = s; | |
5887 | if (s) | |
5888 | { | |
5889 | if (s->left == p) | |
5890 | s->left = r; | |
5891 | else | |
5892 | s->right = r; | |
5893 | } | |
5894 | else | |
5895 | constructor_pending_elts = r; | |
5896 | } | |
5897 | else /* r->balance == -1 */ | |
5898 | { | |
5899 | /* RL rotation */ | |
5900 | struct init_node *t = r->left; | |
5901 | ||
5902 | r->left = t->right; | |
5903 | if (r->left) | |
5904 | r->left->parent = r; | |
5905 | t->right = r; | |
5906 | ||
5907 | p->right = t->left; | |
5908 | if (p->right) | |
5909 | p->right->parent = p; | |
5910 | t->left = p; | |
5911 | ||
5912 | r->balance = (t->balance < 0); | |
5913 | p->balance = -(t->balance > 0); | |
5914 | t->balance = 0; | |
5915 | ||
5916 | s = p->parent; | |
5917 | p->parent = t; | |
5918 | r->parent = t; | |
5919 | t->parent = s; | |
5920 | if (s) | |
5921 | { | |
5922 | if (s->left == p) | |
5923 | s->left = t; | |
5924 | else | |
5925 | s->right = t; | |
5926 | } | |
5927 | else | |
5928 | constructor_pending_elts = t; | |
5929 | } | |
5930 | break; | |
5931 | } | |
5932 | else | |
5933 | { | |
ec5c56db | 5934 | /* p->balance == -1; growth of right side balances the node. */ |
e5e809f4 JL |
5935 | p->balance = 0; |
5936 | break; | |
5937 | } | |
5938 | } | |
5939 | ||
5940 | r = p; | |
5941 | p = p->parent; | |
5942 | } | |
5943 | } | |
5944 | ||
8b6a5902 | 5945 | /* Build AVL tree from a sorted chain. */ |
e5e809f4 | 5946 | |
8b6a5902 JJ |
5947 | static void |
5948 | set_nonincremental_init () | |
5949 | { | |
5950 | tree chain; | |
5951 | ||
5952 | if (TREE_CODE (constructor_type) != RECORD_TYPE | |
5953 | && TREE_CODE (constructor_type) != ARRAY_TYPE) | |
5954 | return; | |
5955 | ||
5956 | for (chain = constructor_elements; chain; chain = TREE_CHAIN (chain)) | |
5957 | add_pending_init (TREE_PURPOSE (chain), TREE_VALUE (chain)); | |
5958 | constructor_elements = 0; | |
5959 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5960 | { | |
5961 | constructor_unfilled_fields = TYPE_FIELDS (constructor_type); | |
5962 | /* Skip any nameless bit fields at the beginning. */ | |
5963 | while (constructor_unfilled_fields != 0 | |
5964 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
5965 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
5966 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
5967 | ||
5968 | } | |
5969 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5970 | { | |
5971 | if (TYPE_DOMAIN (constructor_type)) | |
5972 | constructor_unfilled_index | |
5973 | = convert (bitsizetype, | |
5974 | TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5975 | else | |
5976 | constructor_unfilled_index = bitsize_zero_node; | |
5977 | } | |
5978 | constructor_incremental = 0; | |
5979 | } | |
5980 | ||
5981 | /* Build AVL tree from a string constant. */ | |
5982 | ||
5983 | static void | |
5984 | set_nonincremental_init_from_string (str) | |
5985 | tree str; | |
5986 | { | |
5987 | tree value, purpose, type; | |
5988 | HOST_WIDE_INT val[2]; | |
5989 | const char *p, *end; | |
5990 | int byte, wchar_bytes, charwidth, bitpos; | |
5991 | ||
5992 | if (TREE_CODE (constructor_type) != ARRAY_TYPE) | |
5993 | abort (); | |
5994 | ||
5995 | if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) | |
5996 | == TYPE_PRECISION (char_type_node)) | |
5997 | wchar_bytes = 1; | |
5998 | else if (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (str))) | |
5999 | == TYPE_PRECISION (wchar_type_node)) | |
6000 | wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; | |
6001 | else | |
6002 | abort (); | |
6003 | ||
6004 | charwidth = TYPE_PRECISION (char_type_node); | |
6005 | type = TREE_TYPE (constructor_type); | |
6006 | p = TREE_STRING_POINTER (str); | |
6007 | end = p + TREE_STRING_LENGTH (str); | |
6008 | ||
6009 | for (purpose = bitsize_zero_node; | |
6010 | p < end && !tree_int_cst_lt (constructor_max_index, purpose); | |
6011 | purpose = size_binop (PLUS_EXPR, purpose, bitsize_one_node)) | |
6012 | { | |
6013 | if (wchar_bytes == 1) | |
6014 | { | |
6015 | val[1] = (unsigned char) *p++; | |
6016 | val[0] = 0; | |
6017 | } | |
6018 | else | |
6019 | { | |
6020 | val[0] = 0; | |
6021 | val[1] = 0; | |
6022 | for (byte = 0; byte < wchar_bytes; byte++) | |
6023 | { | |
6024 | if (BYTES_BIG_ENDIAN) | |
6025 | bitpos = (wchar_bytes - byte - 1) * charwidth; | |
6026 | else | |
6027 | bitpos = byte * charwidth; | |
6028 | val[bitpos < HOST_BITS_PER_WIDE_INT] | |
6029 | |= ((unsigned HOST_WIDE_INT) ((unsigned char) *p++)) | |
6030 | << (bitpos % HOST_BITS_PER_WIDE_INT); | |
6031 | } | |
6032 | } | |
6033 | ||
6034 | if (!TREE_UNSIGNED (type)) | |
6035 | { | |
6036 | bitpos = ((wchar_bytes - 1) * charwidth) + HOST_BITS_PER_CHAR; | |
6037 | if (bitpos < HOST_BITS_PER_WIDE_INT) | |
6038 | { | |
6039 | if (val[1] & (((HOST_WIDE_INT) 1) << (bitpos - 1))) | |
6040 | { | |
6041 | val[1] |= ((HOST_WIDE_INT) -1) << bitpos; | |
6042 | val[0] = -1; | |
6043 | } | |
6044 | } | |
6045 | else if (bitpos == HOST_BITS_PER_WIDE_INT) | |
6046 | { | |
6047 | if (val[1] < 0) | |
6048 | val[0] = -1; | |
6049 | } | |
6050 | else if (val[0] & (((HOST_WIDE_INT) 1) | |
6051 | << (bitpos - 1 - HOST_BITS_PER_WIDE_INT))) | |
6052 | val[0] |= ((HOST_WIDE_INT) -1) | |
6053 | << (bitpos - HOST_BITS_PER_WIDE_INT); | |
6054 | } | |
6055 | ||
6056 | value = build_int_2 (val[1], val[0]); | |
6057 | TREE_TYPE (value) = type; | |
6058 | add_pending_init (purpose, value); | |
6059 | } | |
6060 | ||
6061 | constructor_incremental = 0; | |
6062 | } | |
6063 | ||
6064 | /* Return value of FIELD in pending initializer or zero if the field was | |
6065 | not initialized yet. */ | |
6066 | ||
6067 | static tree | |
6068 | find_init_member (field) | |
e5e809f4 JL |
6069 | tree field; |
6070 | { | |
6071 | struct init_node *p; | |
6072 | ||
e5e809f4 JL |
6073 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
6074 | { | |
8b6a5902 JJ |
6075 | if (constructor_incremental |
6076 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
6077 | set_nonincremental_init (); | |
6078 | ||
6079 | p = constructor_pending_elts; | |
e5e809f4 JL |
6080 | while (p) |
6081 | { | |
8b6a5902 | 6082 | if (tree_int_cst_lt (field, p->purpose)) |
e5e809f4 | 6083 | p = p->left; |
8b6a5902 | 6084 | else if (tree_int_cst_lt (p->purpose, field)) |
e5e809f4 | 6085 | p = p->right; |
8b6a5902 JJ |
6086 | else |
6087 | return p->value; | |
e5e809f4 JL |
6088 | } |
6089 | } | |
8b6a5902 | 6090 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) |
e5e809f4 | 6091 | { |
8b6a5902 JJ |
6092 | tree bitpos = bit_position (field); |
6093 | ||
6094 | if (constructor_incremental | |
6095 | && (!constructor_unfilled_fields | |
6096 | || tree_int_cst_lt (bitpos, | |
6097 | bit_position (constructor_unfilled_fields)))) | |
6098 | set_nonincremental_init (); | |
6099 | ||
6100 | p = constructor_pending_elts; | |
e5e809f4 JL |
6101 | while (p) |
6102 | { | |
6103 | if (field == p->purpose) | |
8b6a5902 JJ |
6104 | return p->value; |
6105 | else if (tree_int_cst_lt (bitpos, bit_position (p->purpose))) | |
e5e809f4 JL |
6106 | p = p->left; |
6107 | else | |
6108 | p = p->right; | |
6109 | } | |
6110 | } | |
8b6a5902 JJ |
6111 | else if (TREE_CODE (constructor_type) == UNION_TYPE) |
6112 | { | |
6113 | if (constructor_elements | |
6114 | && TREE_PURPOSE (constructor_elements) == field) | |
6115 | return TREE_VALUE (constructor_elements); | |
6116 | } | |
e5e809f4 JL |
6117 | return 0; |
6118 | } | |
6119 | ||
de520661 RS |
6120 | /* "Output" the next constructor element. |
6121 | At top level, really output it to assembler code now. | |
6122 | Otherwise, collect it in a list from which we will make a CONSTRUCTOR. | |
6123 | TYPE is the data type that the containing data type wants here. | |
6124 | FIELD is the field (a FIELD_DECL) or the index that this element fills. | |
6125 | ||
6126 | PENDING if non-nil means output pending elements that belong | |
6127 | right after this element. (PENDING is normally 1; | |
6128 | it is 0 while outputting pending elements, to avoid recursion.) */ | |
6129 | ||
34403047 | 6130 | static void |
de520661 RS |
6131 | output_init_element (value, type, field, pending) |
6132 | tree value, type, field; | |
6133 | int pending; | |
6134 | { | |
d3ab9753 RS |
6135 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE |
6136 | || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
fd5d5b94 RS |
6137 | && !(TREE_CODE (value) == STRING_CST |
6138 | && TREE_CODE (type) == ARRAY_TYPE | |
6139 | && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE) | |
1e40eab8 RS |
6140 | && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)), |
6141 | TYPE_MAIN_VARIANT (type)))) | |
d3ab9753 RS |
6142 | value = default_conversion (value); |
6143 | ||
e6ecc89b JJ |
6144 | if (TREE_CODE (value) == COMPOUND_LITERAL_EXPR |
6145 | && require_constant_value && !flag_isoc99 && pending) | |
6146 | { | |
6147 | /* As an extension, allow initializing objects with static storage | |
6148 | duration with compound literals (which are then treated just as | |
6149 | the brace enclosed list they contain). */ | |
6150 | tree decl = COMPOUND_LITERAL_EXPR_DECL (value); | |
6151 | value = DECL_INITIAL (decl); | |
6152 | } | |
6153 | ||
d3ab9753 RS |
6154 | if (value == error_mark_node) |
6155 | constructor_erroneous = 1; | |
6156 | else if (!TREE_CONSTANT (value)) | |
6157 | constructor_constant = 0; | |
4160009f RK |
6158 | else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0 |
6159 | || ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6160 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
ef86d2a6 RK |
6161 | && DECL_C_BIT_FIELD (field) |
6162 | && TREE_CODE (value) != INTEGER_CST)) | |
d3ab9753 RS |
6163 | constructor_simple = 0; |
6164 | ||
de520661 RS |
6165 | if (require_constant_value && ! TREE_CONSTANT (value)) |
6166 | { | |
ab87f8c8 | 6167 | error_init ("initializer element is not constant"); |
de520661 RS |
6168 | value = error_mark_node; |
6169 | } | |
6170 | else if (require_constant_elements | |
6171 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) | |
8b6a5902 JJ |
6172 | pedwarn ("initializer element is not computable at load time"); |
6173 | ||
6174 | /* If this field is empty (and not at the end of structure), | |
6175 | don't do anything other than checking the initializer. */ | |
6176 | if (field | |
6177 | && (TREE_TYPE (field) == error_mark_node | |
6178 | || (COMPLETE_TYPE_P (TREE_TYPE (field)) | |
6179 | && integer_zerop (TYPE_SIZE (TREE_TYPE (field))) | |
6180 | && (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6181 | || TREE_CHAIN (field))))) | |
6182 | return; | |
de520661 | 6183 | |
273cf2e4 | 6184 | value = digest_init (type, value, require_constant_value); |
8b6a5902 | 6185 | if (value == error_mark_node) |
de520661 | 6186 | { |
8b6a5902 JJ |
6187 | constructor_erroneous = 1; |
6188 | return; | |
400fbf9f | 6189 | } |
400fbf9f | 6190 | |
de520661 RS |
6191 | /* If this element doesn't come next in sequence, |
6192 | put it on constructor_pending_elts. */ | |
6193 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
8b6a5902 JJ |
6194 | && (!constructor_incremental |
6195 | || !tree_int_cst_equal (field, constructor_unfilled_index))) | |
de520661 | 6196 | { |
8b6a5902 JJ |
6197 | if (constructor_incremental |
6198 | && tree_int_cst_lt (field, constructor_unfilled_index)) | |
6199 | set_nonincremental_init (); | |
6200 | ||
822baa84 | 6201 | add_pending_init (field, value); |
8b6a5902 | 6202 | return; |
de520661 | 6203 | } |
76aaaae2 | 6204 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
8b6a5902 JJ |
6205 | && (!constructor_incremental |
6206 | || field != constructor_unfilled_fields)) | |
de520661 | 6207 | { |
76aaaae2 RS |
6208 | /* We do this for records but not for unions. In a union, |
6209 | no matter which field is specified, it can be initialized | |
6210 | right away since it starts at the beginning of the union. */ | |
8b6a5902 JJ |
6211 | if (constructor_incremental) |
6212 | { | |
6213 | if (!constructor_unfilled_fields) | |
6214 | set_nonincremental_init (); | |
6215 | else | |
6216 | { | |
6217 | tree bitpos, unfillpos; | |
6218 | ||
6219 | bitpos = bit_position (field); | |
6220 | unfillpos = bit_position (constructor_unfilled_fields); | |
6221 | ||
6222 | if (tree_int_cst_lt (bitpos, unfillpos)) | |
6223 | set_nonincremental_init (); | |
6224 | } | |
6225 | } | |
6226 | ||
822baa84 | 6227 | add_pending_init (field, value); |
8b6a5902 | 6228 | return; |
de520661 | 6229 | } |
8b6a5902 JJ |
6230 | else if (TREE_CODE (constructor_type) == UNION_TYPE |
6231 | && constructor_elements) | |
de520661 | 6232 | { |
8b6a5902 JJ |
6233 | if (TREE_SIDE_EFFECTS (TREE_VALUE (constructor_elements))) |
6234 | warning_init ("initialized field with side-effects overwritten"); | |
400fbf9f | 6235 | |
8b6a5902 JJ |
6236 | /* We can have just one union field set. */ |
6237 | constructor_elements = 0; | |
6238 | } | |
c2f4acb7 | 6239 | |
8b6a5902 JJ |
6240 | /* Otherwise, output this element either to |
6241 | constructor_elements or to the assembler file. */ | |
6242 | ||
6243 | if (field && TREE_CODE (field) == INTEGER_CST) | |
6244 | field = copy_node (field); | |
6245 | constructor_elements | |
822baa84 | 6246 | = tree_cons (field, value, constructor_elements); |
8b6a5902 JJ |
6247 | |
6248 | /* Advance the variable that indicates sequential elements output. */ | |
6249 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6250 | constructor_unfilled_index | |
6251 | = size_binop (PLUS_EXPR, constructor_unfilled_index, | |
6252 | bitsize_one_node); | |
6253 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
6254 | { | |
6255 | constructor_unfilled_fields | |
6256 | = TREE_CHAIN (constructor_unfilled_fields); | |
de520661 | 6257 | |
8b6a5902 JJ |
6258 | /* Skip any nameless bit fields. */ |
6259 | while (constructor_unfilled_fields != 0 | |
6260 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6261 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6262 | constructor_unfilled_fields = | |
6263 | TREE_CHAIN (constructor_unfilled_fields); | |
de520661 | 6264 | } |
8b6a5902 JJ |
6265 | else if (TREE_CODE (constructor_type) == UNION_TYPE) |
6266 | constructor_unfilled_fields = 0; | |
6267 | ||
6268 | /* Now output any pending elements which have become next. */ | |
6269 | if (pending) | |
6270 | output_pending_init_elements (0); | |
de520661 | 6271 | } |
400fbf9f | 6272 | |
de520661 RS |
6273 | /* Output any pending elements which have become next. |
6274 | As we output elements, constructor_unfilled_{fields,index} | |
6275 | advances, which may cause other elements to become next; | |
6276 | if so, they too are output. | |
6277 | ||
6278 | If ALL is 0, we return when there are | |
6279 | no more pending elements to output now. | |
6280 | ||
6281 | If ALL is 1, we output space as necessary so that | |
6282 | we can output all the pending elements. */ | |
6283 | ||
6284 | static void | |
6285 | output_pending_init_elements (all) | |
6286 | int all; | |
6287 | { | |
e5e809f4 | 6288 | struct init_node *elt = constructor_pending_elts; |
de520661 RS |
6289 | tree next; |
6290 | ||
6291 | retry: | |
6292 | ||
e5e809f4 | 6293 | /* Look thru the whole pending tree. |
de520661 RS |
6294 | If we find an element that should be output now, |
6295 | output it. Otherwise, set NEXT to the element | |
6296 | that comes first among those still pending. */ | |
6297 | ||
6298 | next = 0; | |
e5e809f4 | 6299 | while (elt) |
de520661 RS |
6300 | { |
6301 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6302 | { | |
e5e809f4 | 6303 | if (tree_int_cst_equal (elt->purpose, |
de520661 | 6304 | constructor_unfilled_index)) |
e5e809f4 JL |
6305 | output_init_element (elt->value, |
6306 | TREE_TYPE (constructor_type), | |
6307 | constructor_unfilled_index, 0); | |
6308 | else if (tree_int_cst_lt (constructor_unfilled_index, | |
6309 | elt->purpose)) | |
400fbf9f | 6310 | { |
e5e809f4 JL |
6311 | /* Advance to the next smaller node. */ |
6312 | if (elt->left) | |
6313 | elt = elt->left; | |
6314 | else | |
6315 | { | |
6316 | /* We have reached the smallest node bigger than the | |
6317 | current unfilled index. Fill the space first. */ | |
6318 | next = elt->purpose; | |
6319 | break; | |
6320 | } | |
6321 | } | |
6322 | else | |
6323 | { | |
6324 | /* Advance to the next bigger node. */ | |
6325 | if (elt->right) | |
6326 | elt = elt->right; | |
6327 | else | |
6328 | { | |
6329 | /* We have reached the biggest node in a subtree. Find | |
6330 | the parent of it, which is the next bigger node. */ | |
6331 | while (elt->parent && elt->parent->right == elt) | |
6332 | elt = elt->parent; | |
6333 | elt = elt->parent; | |
6334 | if (elt && tree_int_cst_lt (constructor_unfilled_index, | |
6335 | elt->purpose)) | |
6336 | { | |
6337 | next = elt->purpose; | |
6338 | break; | |
6339 | } | |
6340 | } | |
de520661 | 6341 | } |
de520661 RS |
6342 | } |
6343 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6344 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6345 | { | |
8b6a5902 JJ |
6346 | tree ctor_unfilled_bitpos, elt_bitpos; |
6347 | ||
e5e809f4 JL |
6348 | /* If the current record is complete we are done. */ |
6349 | if (constructor_unfilled_fields == 0) | |
6350 | break; | |
8b6a5902 JJ |
6351 | |
6352 | ctor_unfilled_bitpos = bit_position (constructor_unfilled_fields); | |
6353 | elt_bitpos = bit_position (elt->purpose); | |
6354 | /* We can't compare fields here because there might be empty | |
6355 | fields in between. */ | |
6356 | if (tree_int_cst_equal (elt_bitpos, ctor_unfilled_bitpos)) | |
de520661 | 6357 | { |
8b6a5902 JJ |
6358 | constructor_unfilled_fields = elt->purpose; |
6359 | output_init_element (elt->value, TREE_TYPE (elt->purpose), | |
6360 | elt->purpose, 0); | |
400fbf9f | 6361 | } |
8b6a5902 | 6362 | else if (tree_int_cst_lt (ctor_unfilled_bitpos, elt_bitpos)) |
e5e809f4 JL |
6363 | { |
6364 | /* Advance to the next smaller node. */ | |
6365 | if (elt->left) | |
6366 | elt = elt->left; | |
6367 | else | |
6368 | { | |
6369 | /* We have reached the smallest node bigger than the | |
6370 | current unfilled field. Fill the space first. */ | |
6371 | next = elt->purpose; | |
6372 | break; | |
6373 | } | |
6374 | } | |
6375 | else | |
6376 | { | |
6377 | /* Advance to the next bigger node. */ | |
6378 | if (elt->right) | |
6379 | elt = elt->right; | |
6380 | else | |
6381 | { | |
6382 | /* We have reached the biggest node in a subtree. Find | |
6383 | the parent of it, which is the next bigger node. */ | |
6384 | while (elt->parent && elt->parent->right == elt) | |
6385 | elt = elt->parent; | |
6386 | elt = elt->parent; | |
6387 | if (elt | |
8b6a5902 JJ |
6388 | && (tree_int_cst_lt (ctor_unfilled_bitpos, |
6389 | bit_position (elt->purpose)))) | |
e5e809f4 JL |
6390 | { |
6391 | next = elt->purpose; | |
6392 | break; | |
6393 | } | |
6394 | } | |
6395 | } | |
400fbf9f | 6396 | } |
de520661 RS |
6397 | } |
6398 | ||
6399 | /* Ordinarily return, but not if we want to output all | |
6400 | and there are elements left. */ | |
6401 | if (! (all && next != 0)) | |
6402 | return; | |
6403 | ||
229a2e65 MM |
6404 | /* If it's not incremental, just skip over the gap, so that after |
6405 | jumping to retry we will output the next successive element. */ | |
6406 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6407 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6408 | constructor_unfilled_fields = next; | |
6409 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6410 | constructor_unfilled_index = next; | |
de520661 | 6411 | |
e5e809f4 JL |
6412 | /* ELT now points to the node in the pending tree with the next |
6413 | initializer to output. */ | |
de520661 RS |
6414 | goto retry; |
6415 | } | |
6416 | \f | |
6417 | /* Add one non-braced element to the current constructor level. | |
6418 | This adjusts the current position within the constructor's type. | |
6419 | This may also start or terminate implicit levels | |
6420 | to handle a partly-braced initializer. | |
6421 | ||
6422 | Once this has found the correct level for the new element, | |
229a2e65 | 6423 | it calls output_init_element. */ |
de520661 RS |
6424 | |
6425 | void | |
6426 | process_init_element (value) | |
6427 | tree value; | |
6428 | { | |
b62acd60 RS |
6429 | tree orig_value = value; |
6430 | int string_flag = value != 0 && TREE_CODE (value) == STRING_CST; | |
6431 | ||
8b6a5902 JJ |
6432 | designator_depth = 0; |
6433 | designator_errorneous = 0; | |
6434 | ||
790e9490 RS |
6435 | /* Handle superfluous braces around string cst as in |
6436 | char x[] = {"foo"}; */ | |
6437 | if (string_flag | |
d27c148b | 6438 | && constructor_type |
790e9490 | 6439 | && TREE_CODE (constructor_type) == ARRAY_TYPE |
61e215dd | 6440 | && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE |
790e9490 RS |
6441 | && integer_zerop (constructor_unfilled_index)) |
6442 | { | |
d739a3bc NS |
6443 | if (constructor_stack->replacement_value) |
6444 | error_init ("excess elements in char array initializer"); | |
790e9490 RS |
6445 | constructor_stack->replacement_value = value; |
6446 | return; | |
6447 | } | |
6448 | ||
790e9490 RS |
6449 | if (constructor_stack->replacement_value != 0) |
6450 | { | |
ab87f8c8 | 6451 | error_init ("excess elements in struct initializer"); |
790e9490 RS |
6452 | return; |
6453 | } | |
6454 | ||
91fa3c30 RS |
6455 | /* Ignore elements of a brace group if it is entirely superfluous |
6456 | and has already been diagnosed. */ | |
6457 | if (constructor_type == 0) | |
6458 | return; | |
6459 | ||
de520661 RS |
6460 | /* If we've exhausted any levels that didn't have braces, |
6461 | pop them now. */ | |
6462 | while (constructor_stack->implicit) | |
6463 | { | |
6464 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6465 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6466 | && constructor_fields == 0) | |
6467 | process_init_element (pop_init_level (1)); | |
6468 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
ec0bc8b6 RK |
6469 | && (constructor_max_index == 0 |
6470 | || tree_int_cst_lt (constructor_max_index, | |
6471 | constructor_index))) | |
de520661 | 6472 | process_init_element (pop_init_level (1)); |
fe67cf58 | 6473 | else |
de520661 | 6474 | break; |
400fbf9f JW |
6475 | } |
6476 | ||
8b6a5902 JJ |
6477 | /* In the case of [LO ... HI] = VALUE, only evaluate VALUE once. */ |
6478 | if (constructor_range_stack) | |
7c94ce7f JJ |
6479 | { |
6480 | /* If value is a compound literal and we'll be just using its | |
6481 | content, don't put it into a SAVE_EXPR. */ | |
6482 | if (TREE_CODE (value) != COMPOUND_LITERAL_EXPR | |
6483 | || !require_constant_value | |
6484 | || flag_isoc99) | |
6485 | value = save_expr (value); | |
6486 | } | |
8b6a5902 | 6487 | |
de520661 | 6488 | while (1) |
400fbf9f | 6489 | { |
de520661 | 6490 | if (TREE_CODE (constructor_type) == RECORD_TYPE) |
400fbf9f | 6491 | { |
de520661 RS |
6492 | tree fieldtype; |
6493 | enum tree_code fieldcode; | |
6494 | ||
6495 | if (constructor_fields == 0) | |
6496 | { | |
ab87f8c8 | 6497 | pedwarn_init ("excess elements in struct initializer"); |
de520661 RS |
6498 | break; |
6499 | } | |
6500 | ||
1d33b2a9 JW |
6501 | fieldtype = TREE_TYPE (constructor_fields); |
6502 | if (fieldtype != error_mark_node) | |
6503 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
de520661 RS |
6504 | fieldcode = TREE_CODE (fieldtype); |
6505 | ||
eba80994 EB |
6506 | /* Error for non-static initialization of a flexible array member. */ |
6507 | if (fieldcode == ARRAY_TYPE | |
6508 | && !require_constant_value | |
6509 | && TYPE_SIZE (fieldtype) == NULL_TREE | |
6510 | && TREE_CHAIN (constructor_fields) == NULL_TREE) | |
6511 | { | |
6512 | error_init ("non-static initialization of a flexible array member"); | |
6513 | break; | |
6514 | } | |
6515 | ||
b62acd60 RS |
6516 | /* Accept a string constant to initialize a subarray. */ |
6517 | if (value != 0 | |
6518 | && fieldcode == ARRAY_TYPE | |
6519 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6520 | && string_flag) | |
6521 | value = orig_value; | |
6522 | /* Otherwise, if we have come to a subaggregate, | |
6523 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6524 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6525 | && value != error_mark_node |
b62acd60 RS |
6526 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype |
6527 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6528 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6529 | { |
6530 | push_init_level (1); | |
6531 | continue; | |
6532 | } | |
6533 | ||
6534 | if (value) | |
6535 | { | |
19d76e60 | 6536 | push_member_name (constructor_fields); |
de520661 RS |
6537 | output_init_element (value, fieldtype, constructor_fields, 1); |
6538 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6539 | } | |
6540 | else | |
b62acd60 RS |
6541 | /* Do the bookkeeping for an element that was |
6542 | directly output as a constructor. */ | |
6543 | { | |
6544 | /* For a record, keep track of end position of last field. */ | |
ffc5c6a9 RH |
6545 | if (DECL_SIZE (constructor_fields)) |
6546 | constructor_bit_index | |
6547 | = size_binop (PLUS_EXPR, | |
6548 | bit_position (constructor_fields), | |
6549 | DECL_SIZE (constructor_fields)); | |
b62acd60 RS |
6550 | |
6551 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
9bbecbc4 R |
6552 | /* Skip any nameless bit fields. */ |
6553 | while (constructor_unfilled_fields != 0 | |
6554 | && DECL_C_BIT_FIELD (constructor_unfilled_fields) | |
6555 | && DECL_NAME (constructor_unfilled_fields) == 0) | |
6556 | constructor_unfilled_fields = | |
6557 | TREE_CHAIN (constructor_unfilled_fields); | |
b62acd60 | 6558 | } |
de520661 RS |
6559 | |
6560 | constructor_fields = TREE_CHAIN (constructor_fields); | |
abc95ed3 | 6561 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 RK |
6562 | while (constructor_fields != 0 |
6563 | && DECL_C_BIT_FIELD (constructor_fields) | |
fc623854 RS |
6564 | && DECL_NAME (constructor_fields) == 0) |
6565 | constructor_fields = TREE_CHAIN (constructor_fields); | |
400fbf9f | 6566 | } |
8b6a5902 | 6567 | else if (TREE_CODE (constructor_type) == UNION_TYPE) |
400fbf9f | 6568 | { |
de520661 RS |
6569 | tree fieldtype; |
6570 | enum tree_code fieldcode; | |
6571 | ||
6572 | if (constructor_fields == 0) | |
6573 | { | |
ab87f8c8 | 6574 | pedwarn_init ("excess elements in union initializer"); |
de520661 RS |
6575 | break; |
6576 | } | |
6577 | ||
1d33b2a9 JW |
6578 | fieldtype = TREE_TYPE (constructor_fields); |
6579 | if (fieldtype != error_mark_node) | |
6580 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
de520661 RS |
6581 | fieldcode = TREE_CODE (fieldtype); |
6582 | ||
253b6b82 KG |
6583 | /* Warn that traditional C rejects initialization of unions. |
6584 | We skip the warning if the value is zero. This is done | |
6585 | under the assumption that the zero initializer in user | |
6586 | code appears conditioned on e.g. __STDC__ to avoid | |
6587 | "missing initializer" warnings and relies on default | |
b621a4dd ZW |
6588 | initialization to zero in the traditional C case. |
6589 | We also skip the warning if the initializer is designated, | |
6590 | again on the assumption that this must be conditional on | |
6591 | __STDC__ anyway (and we've already complained about the | |
6592 | member-designator already). */ | |
6593 | if (warn_traditional && !in_system_header && !constructor_designated | |
32892c52 | 6594 | && !(value && (integer_zerop (value) || real_zerop (value)))) |
253b6b82 KG |
6595 | warning ("traditional C rejects initialization of unions"); |
6596 | ||
b62acd60 RS |
6597 | /* Accept a string constant to initialize a subarray. */ |
6598 | if (value != 0 | |
6599 | && fieldcode == ARRAY_TYPE | |
6600 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6601 | && string_flag) | |
6602 | value = orig_value; | |
6603 | /* Otherwise, if we have come to a subaggregate, | |
6604 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6605 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6606 | && value != error_mark_node |
b62acd60 RS |
6607 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype |
6608 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6609 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6610 | { |
6611 | push_init_level (1); | |
6612 | continue; | |
6613 | } | |
6614 | ||
6615 | if (value) | |
6616 | { | |
19d76e60 | 6617 | push_member_name (constructor_fields); |
de520661 RS |
6618 | output_init_element (value, fieldtype, constructor_fields, 1); |
6619 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6620 | } | |
6621 | else | |
94ba5069 RS |
6622 | /* Do the bookkeeping for an element that was |
6623 | directly output as a constructor. */ | |
6624 | { | |
665f2503 | 6625 | constructor_bit_index = DECL_SIZE (constructor_fields); |
94ba5069 RS |
6626 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); |
6627 | } | |
de520661 RS |
6628 | |
6629 | constructor_fields = 0; | |
400fbf9f | 6630 | } |
8b6a5902 | 6631 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
de520661 RS |
6632 | { |
6633 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6634 | enum tree_code eltcode = TREE_CODE (elttype); | |
6635 | ||
b62acd60 RS |
6636 | /* Accept a string constant to initialize a subarray. */ |
6637 | if (value != 0 | |
6638 | && eltcode == ARRAY_TYPE | |
6639 | && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE | |
6640 | && string_flag) | |
6641 | value = orig_value; | |
6642 | /* Otherwise, if we have come to a subaggregate, | |
6643 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6644 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6645 | && value != error_mark_node |
b62acd60 RS |
6646 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype |
6647 | && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE | |
6648 | || eltcode == UNION_TYPE)) | |
de520661 RS |
6649 | { |
6650 | push_init_level (1); | |
6651 | continue; | |
6652 | } | |
6653 | ||
6654 | if (constructor_max_index != 0 | |
4b606faf WC |
6655 | && (tree_int_cst_lt (constructor_max_index, constructor_index) |
6656 | || integer_all_onesp (constructor_max_index))) | |
de520661 | 6657 | { |
ab87f8c8 | 6658 | pedwarn_init ("excess elements in array initializer"); |
de520661 RS |
6659 | break; |
6660 | } | |
400fbf9f | 6661 | |
8b6a5902 JJ |
6662 | /* Now output the actual element. */ |
6663 | if (value) | |
ee2990e7 | 6664 | { |
8b6a5902 JJ |
6665 | push_array_bounds (tree_low_cst (constructor_index, 0)); |
6666 | output_init_element (value, elttype, constructor_index, 1); | |
6667 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
ee2990e7 | 6668 | } |
333a5dae | 6669 | |
8b6a5902 JJ |
6670 | constructor_index |
6671 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
400fbf9f | 6672 | |
8b6a5902 JJ |
6673 | if (! value) |
6674 | /* If we are doing the bookkeeping for an element that was | |
6675 | directly output as a constructor, we must update | |
6676 | constructor_unfilled_index. */ | |
6677 | constructor_unfilled_index = constructor_index; | |
de520661 | 6678 | } |
e6834654 SS |
6679 | else if (TREE_CODE (constructor_type) == VECTOR_TYPE) |
6680 | { | |
6681 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6682 | ||
6683 | /* Do a basic check of initializer size. Note that vectors | |
6684 | always have a fixed size derived from their type. */ | |
6685 | if (tree_int_cst_lt (constructor_max_index, constructor_index)) | |
6686 | { | |
6687 | pedwarn_init ("excess elements in vector initializer"); | |
6688 | break; | |
6689 | } | |
6690 | ||
6691 | /* Now output the actual element. */ | |
6692 | if (value) | |
6693 | output_init_element (value, elttype, constructor_index, 1); | |
6694 | ||
6695 | constructor_index | |
6696 | = size_binop (PLUS_EXPR, constructor_index, bitsize_one_node); | |
6697 | ||
6698 | if (! value) | |
6699 | /* If we are doing the bookkeeping for an element that was | |
6700 | directly output as a constructor, we must update | |
6701 | constructor_unfilled_index. */ | |
6702 | constructor_unfilled_index = constructor_index; | |
6703 | } | |
de520661 RS |
6704 | |
6705 | /* Handle the sole element allowed in a braced initializer | |
6706 | for a scalar variable. */ | |
8b6a5902 | 6707 | else if (constructor_fields == 0) |
de520661 | 6708 | { |
ab87f8c8 | 6709 | pedwarn_init ("excess elements in scalar initializer"); |
de520661 RS |
6710 | break; |
6711 | } | |
8b6a5902 JJ |
6712 | else |
6713 | { | |
6714 | if (value) | |
6715 | output_init_element (value, constructor_type, NULL_TREE, 1); | |
6716 | constructor_fields = 0; | |
6717 | } | |
6718 | ||
6719 | /* Handle range initializers either at this level or anywhere higher | |
6720 | in the designator stack. */ | |
6721 | if (constructor_range_stack) | |
6722 | { | |
6723 | struct constructor_range_stack *p, *range_stack; | |
6724 | int finish = 0; | |
6725 | ||
6726 | range_stack = constructor_range_stack; | |
6727 | constructor_range_stack = 0; | |
6728 | while (constructor_stack != range_stack->stack) | |
6729 | { | |
6730 | if (!constructor_stack->implicit) | |
6731 | abort (); | |
6732 | process_init_element (pop_init_level (1)); | |
6733 | } | |
6734 | for (p = range_stack; | |
6735 | !p->range_end || tree_int_cst_equal (p->index, p->range_end); | |
6736 | p = p->prev) | |
6737 | { | |
6738 | if (!constructor_stack->implicit) | |
6739 | abort (); | |
6740 | process_init_element (pop_init_level (1)); | |
6741 | } | |
6742 | ||
6743 | p->index = size_binop (PLUS_EXPR, p->index, bitsize_one_node); | |
6744 | if (tree_int_cst_equal (p->index, p->range_end) && !p->prev) | |
6745 | finish = 1; | |
6746 | ||
6747 | while (1) | |
6748 | { | |
6749 | constructor_index = p->index; | |
6750 | constructor_fields = p->fields; | |
6751 | if (finish && p->range_end && p->index == p->range_start) | |
6752 | { | |
6753 | finish = 0; | |
6754 | p->prev = 0; | |
6755 | } | |
6756 | p = p->next; | |
6757 | if (!p) | |
6758 | break; | |
6759 | push_init_level (2); | |
6760 | p->stack = constructor_stack; | |
6761 | if (p->range_end && tree_int_cst_equal (p->index, p->range_end)) | |
6762 | p->index = p->range_start; | |
6763 | } | |
6764 | ||
6765 | if (!finish) | |
6766 | constructor_range_stack = range_stack; | |
6767 | continue; | |
6768 | } | |
de520661 | 6769 | |
de520661 | 6770 | break; |
fe67cf58 | 6771 | } |
8b6a5902 JJ |
6772 | |
6773 | constructor_range_stack = 0; | |
400fbf9f JW |
6774 | } |
6775 | \f | |
15b732b2 NB |
6776 | /* Build a simple asm-statement, from one string literal. */ |
6777 | tree | |
a23c9413 NB |
6778 | simple_asm_stmt (expr) |
6779 | tree expr; | |
15b732b2 | 6780 | { |
a23c9413 NB |
6781 | STRIP_NOPS (expr); |
6782 | ||
6783 | if (TREE_CODE (expr) == ADDR_EXPR) | |
6784 | expr = TREE_OPERAND (expr, 0); | |
15b732b2 | 6785 | |
a23c9413 NB |
6786 | if (TREE_CODE (expr) == STRING_CST) |
6787 | { | |
6788 | tree stmt; | |
6789 | ||
a23c9413 NB |
6790 | stmt = add_stmt (build_stmt (ASM_STMT, NULL_TREE, expr, |
6791 | NULL_TREE, NULL_TREE, | |
6792 | NULL_TREE)); | |
6793 | ASM_INPUT_P (stmt) = 1; | |
6794 | return stmt; | |
6795 | } | |
6796 | ||
6797 | error ("argument of `asm' is not a constant string"); | |
6798 | return NULL_TREE; | |
15b732b2 NB |
6799 | } |
6800 | ||
64094f6a RH |
6801 | /* Build an asm-statement, whose components are a CV_QUALIFIER, a |
6802 | STRING, some OUTPUTS, some INPUTS, and some CLOBBERS. */ | |
400fbf9f | 6803 | |
64094f6a RH |
6804 | tree |
6805 | build_asm_stmt (cv_qualifier, string, outputs, inputs, clobbers) | |
6806 | tree cv_qualifier; | |
6807 | tree string; | |
6808 | tree outputs; | |
6809 | tree inputs; | |
6810 | tree clobbers; | |
400fbf9f | 6811 | { |
64094f6a | 6812 | tree tail; |
400fbf9f | 6813 | |
a23c9413 NB |
6814 | if (TREE_CODE (string) != STRING_CST) |
6815 | { | |
6816 | error ("asm template is not a string constant"); | |
6817 | return NULL_TREE; | |
6818 | } | |
6819 | ||
64094f6a RH |
6820 | if (cv_qualifier != NULL_TREE |
6821 | && cv_qualifier != ridpointers[(int) RID_VOLATILE]) | |
6822 | { | |
6823 | warning ("%s qualifier ignored on asm", | |
6824 | IDENTIFIER_POINTER (cv_qualifier)); | |
6825 | cv_qualifier = NULL_TREE; | |
6826 | } | |
6827 | ||
6828 | /* We can remove output conversions that change the type, | |
6829 | but not the mode. */ | |
6830 | for (tail = outputs; tail; tail = TREE_CHAIN (tail)) | |
c5c76735 JL |
6831 | { |
6832 | tree output = TREE_VALUE (tail); | |
6833 | ||
c5c76735 | 6834 | STRIP_NOPS (output); |
64094f6a | 6835 | TREE_VALUE (tail) = output; |
c5c76735 JL |
6836 | |
6837 | /* Allow conversions as LHS here. build_modify_expr as called below | |
6838 | will do the right thing with them. */ | |
6839 | while (TREE_CODE (output) == NOP_EXPR | |
6840 | || TREE_CODE (output) == CONVERT_EXPR | |
6841 | || TREE_CODE (output) == FLOAT_EXPR | |
6842 | || TREE_CODE (output) == FIX_TRUNC_EXPR | |
6843 | || TREE_CODE (output) == FIX_FLOOR_EXPR | |
6844 | || TREE_CODE (output) == FIX_ROUND_EXPR | |
6845 | || TREE_CODE (output) == FIX_CEIL_EXPR) | |
1bef1e7c | 6846 | output = TREE_OPERAND (output, 0); |
c5c76735 | 6847 | |
64094f6a RH |
6848 | lvalue_or_else (TREE_VALUE (tail), "invalid lvalue in asm statement"); |
6849 | } | |
6850 | ||
6851 | /* Remove output conversions that change the type but not the mode. */ | |
6852 | for (tail = outputs; tail; tail = TREE_CHAIN (tail)) | |
6853 | { | |
6854 | tree output = TREE_VALUE (tail); | |
6855 | STRIP_NOPS (output); | |
6856 | TREE_VALUE (tail) = output; | |
c5c76735 | 6857 | } |
400fbf9f | 6858 | |
64094f6a RH |
6859 | /* Perform default conversions on array and function inputs. |
6860 | Don't do this for other types as it would screw up operands | |
6861 | expected to be in memory. */ | |
6862 | for (tail = inputs; tail; tail = TREE_CHAIN (tail)) | |
207bf485 | 6863 | TREE_VALUE (tail) = default_function_array_conversion (TREE_VALUE (tail)); |
400fbf9f | 6864 | |
64094f6a RH |
6865 | return add_stmt (build_stmt (ASM_STMT, cv_qualifier, string, |
6866 | outputs, inputs, clobbers)); | |
6867 | } | |
6868 | ||
6869 | /* Expand an ASM statement with operands, handling output operands | |
6870 | that are not variables or INDIRECT_REFS by transforming such | |
6871 | cases into cases that expand_asm_operands can handle. | |
6872 | ||
6873 | Arguments are same as for expand_asm_operands. */ | |
6874 | ||
6875 | void | |
6876 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
6877 | tree string, outputs, inputs, clobbers; | |
6878 | int vol; | |
6879 | const char *filename; | |
6880 | int line; | |
6881 | { | |
6882 | int noutputs = list_length (outputs); | |
b3694847 | 6883 | int i; |
64094f6a | 6884 | /* o[I] is the place that output number I should be written. */ |
b3694847 SS |
6885 | tree *o = (tree *) alloca (noutputs * sizeof (tree)); |
6886 | tree tail; | |
64094f6a RH |
6887 | |
6888 | /* Record the contents of OUTPUTS before it is modified. */ | |
6889 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6890 | o[i] = TREE_VALUE (tail); | |
8f17b5c5 | 6891 | |
64094f6a RH |
6892 | /* Generate the ASM_OPERANDS insn; store into the TREE_VALUEs of |
6893 | OUTPUTS some trees for where the values were actually stored. */ | |
400fbf9f JW |
6894 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); |
6895 | ||
6896 | /* Copy all the intermediate outputs into the specified outputs. */ | |
6897 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6898 | { | |
6899 | if (o[i] != TREE_VALUE (tail)) | |
6900 | { | |
6901 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
f5a8bfff | 6902 | NULL_RTX, VOIDmode, EXPAND_NORMAL); |
400fbf9f | 6903 | free_temp_slots (); |
39b726dd RH |
6904 | |
6905 | /* Restore the original value so that it's correct the next | |
6906 | time we expand this function. */ | |
6907 | TREE_VALUE (tail) = o[i]; | |
400fbf9f JW |
6908 | } |
6909 | /* Detect modification of read-only values. | |
6910 | (Otherwise done by build_modify_expr.) */ | |
6911 | else | |
6912 | { | |
6913 | tree type = TREE_TYPE (o[i]); | |
a43ea319 RK |
6914 | if (TREE_READONLY (o[i]) |
6915 | || TYPE_READONLY (type) | |
400fbf9f JW |
6916 | || ((TREE_CODE (type) == RECORD_TYPE |
6917 | || TREE_CODE (type) == UNION_TYPE) | |
6918 | && C_TYPE_FIELDS_READONLY (type))) | |
6919 | readonly_warning (o[i], "modification by `asm'"); | |
6920 | } | |
6921 | } | |
6922 | ||
6923 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
6924 | emit_queue (); | |
6925 | } | |
6926 | \f | |
6927 | /* Expand a C `return' statement. | |
6928 | RETVAL is the expression for what to return, | |
6929 | or a null pointer for `return;' with no value. */ | |
6930 | ||
64094f6a | 6931 | tree |
400fbf9f JW |
6932 | c_expand_return (retval) |
6933 | tree retval; | |
6934 | { | |
6935 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
6936 | ||
6937 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
08bf538e | 6938 | warning ("function declared `noreturn' has a `return' statement"); |
400fbf9f JW |
6939 | |
6940 | if (!retval) | |
6941 | { | |
6942 | current_function_returns_null = 1; | |
903f51d9 RH |
6943 | if ((warn_return_type || flag_isoc99) |
6944 | && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
6945 | pedwarn_c99 ("`return' with no value, in function returning non-void"); | |
400fbf9f JW |
6946 | } |
6947 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) | |
6948 | { | |
6949 | current_function_returns_null = 1; | |
6950 | if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
6951 | pedwarn ("`return' with a value, in function returning void"); | |
400fbf9f JW |
6952 | } |
6953 | else | |
6954 | { | |
ab87f8c8 | 6955 | tree t = convert_for_assignment (valtype, retval, _("return"), |
9b7267b8 | 6956 | NULL_TREE, NULL_TREE, 0); |
400fbf9f | 6957 | tree res = DECL_RESULT (current_function_decl); |
88a3dbc1 | 6958 | tree inner; |
70768eda | 6959 | |
5ce89b2e | 6960 | current_function_returns_value = 1; |
70768eda | 6961 | if (t == error_mark_node) |
64094f6a | 6962 | return NULL_TREE; |
70768eda | 6963 | |
88a3dbc1 RK |
6964 | inner = t = convert (TREE_TYPE (res), t); |
6965 | ||
6966 | /* Strip any conversions, additions, and subtractions, and see if | |
6967 | we are returning the address of a local variable. Warn if so. */ | |
abe80e6d | 6968 | while (1) |
88a3dbc1 | 6969 | { |
abe80e6d RK |
6970 | switch (TREE_CODE (inner)) |
6971 | { | |
6972 | case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR: | |
6973 | case PLUS_EXPR: | |
6974 | inner = TREE_OPERAND (inner, 0); | |
6975 | continue; | |
6976 | ||
6977 | case MINUS_EXPR: | |
6978 | /* If the second operand of the MINUS_EXPR has a pointer | |
6979 | type (or is converted from it), this may be valid, so | |
6980 | don't give a warning. */ | |
6981 | { | |
6982 | tree op1 = TREE_OPERAND (inner, 1); | |
6983 | ||
6984 | while (! POINTER_TYPE_P (TREE_TYPE (op1)) | |
6985 | && (TREE_CODE (op1) == NOP_EXPR | |
6986 | || TREE_CODE (op1) == NON_LVALUE_EXPR | |
6987 | || TREE_CODE (op1) == CONVERT_EXPR)) | |
6988 | op1 = TREE_OPERAND (op1, 0); | |
6989 | ||
6990 | if (POINTER_TYPE_P (TREE_TYPE (op1))) | |
6991 | break; | |
88a3dbc1 | 6992 | |
abe80e6d RK |
6993 | inner = TREE_OPERAND (inner, 0); |
6994 | continue; | |
6995 | } | |
6996 | ||
6997 | case ADDR_EXPR: | |
6998 | inner = TREE_OPERAND (inner, 0); | |
88a3dbc1 | 6999 | |
abe80e6d RK |
7000 | while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r') |
7001 | inner = TREE_OPERAND (inner, 0); | |
7002 | ||
7003 | if (TREE_CODE (inner) == VAR_DECL | |
7004 | && ! DECL_EXTERNAL (inner) | |
7005 | && ! TREE_STATIC (inner) | |
7006 | && DECL_CONTEXT (inner) == current_function_decl) | |
7007 | warning ("function returns address of local variable"); | |
7008 | break; | |
e9a25f70 JL |
7009 | |
7010 | default: | |
7011 | break; | |
abe80e6d RK |
7012 | } |
7013 | ||
7014 | break; | |
88a3dbc1 RK |
7015 | } |
7016 | ||
56cb9733 | 7017 | retval = build (MODIFY_EXPR, TREE_TYPE (res), res, t); |
400fbf9f | 7018 | } |
56cb9733 | 7019 | |
64094f6a | 7020 | return add_stmt (build_return_stmt (retval)); |
400fbf9f JW |
7021 | } |
7022 | \f | |
8f17b5c5 MM |
7023 | struct c_switch { |
7024 | /* The SWITCH_STMT being built. */ | |
7025 | tree switch_stmt; | |
7026 | /* A splay-tree mapping the low element of a case range to the high | |
7027 | element, or NULL_TREE if there is no high element. Used to | |
7028 | determine whether or not a new case label duplicates an old case | |
7029 | label. We need a tree, rather than simply a hash table, because | |
7030 | of the GNU case range extension. */ | |
7031 | splay_tree cases; | |
7032 | /* The next node on the stack. */ | |
7033 | struct c_switch *next; | |
7034 | }; | |
7035 | ||
7036 | /* A stack of the currently active switch statements. The innermost | |
7037 | switch statement is on the top of the stack. There is no need to | |
7038 | mark the stack for garbage collection because it is only active | |
7039 | during the processing of the body of a function, and we never | |
7040 | collect at that point. */ | |
7041 | ||
7042 | static struct c_switch *switch_stack; | |
7043 | ||
7044 | /* Start a C switch statement, testing expression EXP. Return the new | |
7045 | SWITCH_STMT. */ | |
400fbf9f JW |
7046 | |
7047 | tree | |
8f17b5c5 | 7048 | c_start_case (exp) |
400fbf9f JW |
7049 | tree exp; |
7050 | { | |
b3694847 | 7051 | enum tree_code code; |
6f9fdf4d | 7052 | tree type, orig_type = error_mark_node; |
8f17b5c5 | 7053 | struct c_switch *cs; |
e89a9554 | 7054 | |
8f17b5c5 MM |
7055 | if (exp != error_mark_node) |
7056 | { | |
7057 | code = TREE_CODE (TREE_TYPE (exp)); | |
6f9fdf4d | 7058 | orig_type = TREE_TYPE (exp); |
e89a9554 | 7059 | |
6f9fdf4d | 7060 | if (! INTEGRAL_TYPE_P (orig_type) |
8f17b5c5 MM |
7061 | && code != ERROR_MARK) |
7062 | { | |
7063 | error ("switch quantity not an integer"); | |
7064 | exp = integer_zero_node; | |
7065 | } | |
7066 | else | |
7067 | { | |
8f17b5c5 | 7068 | type = TYPE_MAIN_VARIANT (TREE_TYPE (exp)); |
400fbf9f | 7069 | |
8f17b5c5 MM |
7070 | if (warn_traditional && !in_system_header |
7071 | && (type == long_integer_type_node | |
7072 | || type == long_unsigned_type_node)) | |
7073 | warning ("`long' switch expression not converted to `int' in ISO C"); | |
7074 | ||
7075 | exp = default_conversion (exp); | |
7076 | type = TREE_TYPE (exp); | |
8f17b5c5 | 7077 | } |
400fbf9f | 7078 | } |
8f17b5c5 MM |
7079 | |
7080 | /* Add this new SWITCH_STMT to the stack. */ | |
2ac86f90 | 7081 | cs = (struct c_switch *) xmalloc (sizeof (*cs)); |
6f9fdf4d | 7082 | cs->switch_stmt = build_stmt (SWITCH_STMT, exp, NULL_TREE, orig_type); |
8f17b5c5 MM |
7083 | cs->cases = splay_tree_new (case_compare, NULL, NULL); |
7084 | cs->next = switch_stack; | |
7085 | switch_stack = cs; | |
7086 | ||
7087 | return add_stmt (switch_stack->switch_stmt); | |
7088 | } | |
7089 | ||
7090 | /* Process a case label. */ | |
7091 | ||
64094f6a | 7092 | tree |
8f17b5c5 MM |
7093 | do_case (low_value, high_value) |
7094 | tree low_value; | |
7095 | tree high_value; | |
7096 | { | |
64094f6a RH |
7097 | tree label = NULL_TREE; |
7098 | ||
8f17b5c5 | 7099 | if (switch_stack) |
64094f6a RH |
7100 | { |
7101 | label = c_add_case_label (switch_stack->cases, | |
7102 | SWITCH_COND (switch_stack->switch_stmt), | |
7103 | low_value, high_value); | |
7104 | if (label == error_mark_node) | |
7105 | label = NULL_TREE; | |
7106 | } | |
8f17b5c5 MM |
7107 | else if (low_value) |
7108 | error ("case label not within a switch statement"); | |
400fbf9f | 7109 | else |
8f17b5c5 | 7110 | error ("`default' label not within a switch statement"); |
64094f6a RH |
7111 | |
7112 | return label; | |
8f17b5c5 | 7113 | } |
400fbf9f | 7114 | |
8f17b5c5 | 7115 | /* Finish the switch statement. */ |
400fbf9f | 7116 | |
8f17b5c5 MM |
7117 | void |
7118 | c_finish_case () | |
7119 | { | |
7120 | struct c_switch *cs = switch_stack; | |
400fbf9f | 7121 | |
8f17b5c5 | 7122 | RECHAIN_STMTS (cs->switch_stmt, SWITCH_BODY (cs->switch_stmt)); |
400fbf9f | 7123 | |
8f17b5c5 MM |
7124 | /* Pop the stack. */ |
7125 | switch_stack = switch_stack->next; | |
7126 | splay_tree_delete (cs->cases); | |
7127 | free (cs); | |
400fbf9f | 7128 | } |