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400fbf9f | 1 | /* Build expressions with type checking for C compiler. |
a4fc4b2d | 2 | Copyright (C) 1987, 88, 91-7, 1998 Free Software Foundation, Inc. |
400fbf9f JW |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
940d9d63 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
400fbf9f JW |
20 | |
21 | ||
22 | /* This file is part of the C front end. | |
23 | It contains routines to build C expressions given their operands, | |
24 | including computing the types of the result, C-specific error checks, | |
25 | and some optimization. | |
26 | ||
27 | There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, | |
28 | and to process initializations in declarations (since they work | |
29 | like a strange sort of assignment). */ | |
30 | ||
31 | #include "config.h" | |
32 | #include <stdio.h> | |
33 | #include "tree.h" | |
34 | #include "c-tree.h" | |
35 | #include "flags.h" | |
e14417fa | 36 | #include "output.h" |
400fbf9f | 37 | |
956d6950 JL |
38 | #ifdef HAVE_STDLIB_H |
39 | #include <stdlib.h> | |
40 | #endif | |
41 | ||
42 | #ifdef HAVE_STRING_H | |
43 | #include <string.h> | |
44 | #else | |
45 | #ifdef HAVE_STRINGS_H | |
46 | #include <strings.h> | |
47 | #endif | |
48 | #endif | |
49 | ||
b71c7f8a | 50 | /* Nonzero if we've already printed a "missing braces around initializer" |
103b7b17 | 51 | message within this initializer. */ |
b71c7f8a | 52 | static int missing_braces_mentioned; |
103b7b17 | 53 | |
956d6950 | 54 | #ifdef NEED_DECLARATION_INDEX |
3845b542 | 55 | extern char *index (); |
956d6950 JL |
56 | #endif |
57 | ||
58 | #ifdef NEED_DECLARATION_RINDEX | |
3845b542 | 59 | extern char *rindex (); |
956d6950 | 60 | #endif |
3845b542 | 61 | |
9f6de2b9 | 62 | static tree qualify_type PROTO((tree, tree)); |
75ddf8b0 RK |
63 | static int comp_target_types PROTO((tree, tree)); |
64 | static int function_types_compatible_p PROTO((tree, tree)); | |
65 | static int type_lists_compatible_p PROTO((tree, tree)); | |
66 | static int self_promoting_type_p PROTO((tree)); | |
67 | static tree decl_constant_value PROTO((tree)); | |
68 | static tree lookup_field PROTO((tree, tree, tree *)); | |
69 | static tree convert_arguments PROTO((tree, tree, tree, tree)); | |
70 | static tree pointer_int_sum PROTO((enum tree_code, tree, tree)); | |
71 | static tree pointer_diff PROTO((tree, tree)); | |
72 | static tree unary_complex_lvalue PROTO((enum tree_code, tree)); | |
73 | static void pedantic_lvalue_warning PROTO((enum tree_code)); | |
74 | static tree internal_build_compound_expr PROTO((tree, int)); | |
75 | static tree convert_for_assignment PROTO((tree, tree, char *, tree, | |
76 | tree, int)); | |
77 | static void warn_for_assignment PROTO((char *, char *, tree, int)); | |
78 | static tree valid_compound_expr_initializer PROTO((tree, tree)); | |
79 | static void push_string PROTO((char *)); | |
80 | static void push_member_name PROTO((tree)); | |
81 | static void push_array_bounds PROTO((int)); | |
82 | static int spelling_length PROTO((void)); | |
83 | static char *print_spelling PROTO((char *)); | |
84 | static char *get_spelling PROTO((char *)); | |
85 | static void warning_init PROTO((char *, char *, | |
86 | char *)); | |
87 | static tree digest_init PROTO((tree, tree, int, int)); | |
88 | static void check_init_type_bitfields PROTO((tree)); | |
89 | static void output_init_element PROTO((tree, tree, tree, int)); | |
90 | static void output_pending_init_elements PROTO((int)); | |
400fbf9f JW |
91 | \f |
92 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
93 | does not have an incomplete type. (That includes void types.) */ | |
94 | ||
95 | tree | |
96 | require_complete_type (value) | |
97 | tree value; | |
98 | { | |
99 | tree type = TREE_TYPE (value); | |
100 | ||
101 | /* First, detect a valid value with a complete type. */ | |
102 | if (TYPE_SIZE (type) != 0 | |
103 | && type != void_type_node) | |
104 | return value; | |
105 | ||
106 | incomplete_type_error (value, type); | |
107 | return error_mark_node; | |
108 | } | |
109 | ||
110 | /* Print an error message for invalid use of an incomplete type. | |
111 | VALUE is the expression that was used (or 0 if that isn't known) | |
112 | and TYPE is the type that was invalid. */ | |
113 | ||
114 | void | |
115 | incomplete_type_error (value, type) | |
116 | tree value; | |
117 | tree type; | |
118 | { | |
119 | char *errmsg; | |
120 | ||
121 | /* Avoid duplicate error message. */ | |
122 | if (TREE_CODE (type) == ERROR_MARK) | |
123 | return; | |
124 | ||
125 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
126 | || TREE_CODE (value) == PARM_DECL)) | |
127 | error ("`%s' has an incomplete type", | |
128 | IDENTIFIER_POINTER (DECL_NAME (value))); | |
129 | else | |
130 | { | |
131 | retry: | |
132 | /* We must print an error message. Be clever about what it says. */ | |
133 | ||
134 | switch (TREE_CODE (type)) | |
135 | { | |
136 | case RECORD_TYPE: | |
137 | errmsg = "invalid use of undefined type `struct %s'"; | |
138 | break; | |
139 | ||
140 | case UNION_TYPE: | |
141 | errmsg = "invalid use of undefined type `union %s'"; | |
142 | break; | |
143 | ||
144 | case ENUMERAL_TYPE: | |
145 | errmsg = "invalid use of undefined type `enum %s'"; | |
146 | break; | |
147 | ||
148 | case VOID_TYPE: | |
149 | error ("invalid use of void expression"); | |
150 | return; | |
151 | ||
152 | case ARRAY_TYPE: | |
153 | if (TYPE_DOMAIN (type)) | |
154 | { | |
155 | type = TREE_TYPE (type); | |
156 | goto retry; | |
157 | } | |
158 | error ("invalid use of array with unspecified bounds"); | |
159 | return; | |
160 | ||
161 | default: | |
162 | abort (); | |
163 | } | |
164 | ||
165 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
166 | error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
167 | else | |
168 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
169 | error ("invalid use of incomplete typedef `%s'", | |
170 | IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
171 | } | |
172 | } | |
173 | ||
174 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
175 | as well as those of TYPE. */ | |
176 | ||
177 | static tree | |
178 | qualify_type (type, like) | |
179 | tree type, like; | |
180 | { | |
181 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
182 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
183 | return c_build_type_variant (type, constflag, volflag); | |
184 | } | |
185 | \f | |
186 | /* Return the common type of two types. | |
187 | We assume that comptypes has already been done and returned 1; | |
6cb72a7d RS |
188 | if that isn't so, this may crash. In particular, we assume that qualifiers |
189 | match. | |
400fbf9f JW |
190 | |
191 | This is the type for the result of most arithmetic operations | |
6cb72a7d | 192 | if the operands have the given two types. */ |
400fbf9f JW |
193 | |
194 | tree | |
195 | common_type (t1, t2) | |
196 | tree t1, t2; | |
197 | { | |
198 | register enum tree_code code1; | |
199 | register enum tree_code code2; | |
4b027d16 | 200 | tree attributes; |
400fbf9f JW |
201 | |
202 | /* Save time if the two types are the same. */ | |
203 | ||
204 | if (t1 == t2) return t1; | |
205 | ||
206 | /* If one type is nonsense, use the other. */ | |
207 | if (t1 == error_mark_node) | |
208 | return t2; | |
209 | if (t2 == error_mark_node) | |
210 | return t1; | |
211 | ||
d9525bec BK |
212 | /* Merge the attributes. */ |
213 | attributes = merge_machine_type_attributes (t1, t2); | |
4b027d16 | 214 | |
400fbf9f JW |
215 | /* Treat an enum type as the unsigned integer type of the same width. */ |
216 | ||
217 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
218 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
219 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
220 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
221 | ||
222 | code1 = TREE_CODE (t1); | |
223 | code2 = TREE_CODE (t2); | |
224 | ||
75326e8c RK |
225 | /* If one type is complex, form the common type of the non-complex |
226 | components, then make that complex. Use T1 or T2 if it is the | |
227 | required type. */ | |
b6a10c9f RS |
228 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) |
229 | { | |
75326e8c RK |
230 | tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; |
231 | tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; | |
232 | tree subtype = common_type (subtype1, subtype2); | |
233 | ||
234 | if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) | |
4b027d16 | 235 | return build_type_attribute_variant (t1, attributes); |
75326e8c | 236 | else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) |
4b027d16 | 237 | return build_type_attribute_variant (t2, attributes); |
b6a10c9f | 238 | else |
4b027d16 RK |
239 | return build_type_attribute_variant (build_complex_type (subtype), |
240 | attributes); | |
b6a10c9f RS |
241 | } |
242 | ||
400fbf9f JW |
243 | switch (code1) |
244 | { | |
245 | case INTEGER_TYPE: | |
246 | case REAL_TYPE: | |
247 | /* If only one is real, use it as the result. */ | |
248 | ||
249 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
4b027d16 | 250 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
251 | |
252 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
4b027d16 | 253 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
254 | |
255 | /* Both real or both integers; use the one with greater precision. */ | |
256 | ||
257 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
4b027d16 | 258 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 259 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
4b027d16 | 260 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
261 | |
262 | /* Same precision. Prefer longs to ints even when same size. */ | |
263 | ||
36618528 RS |
264 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
265 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
4b027d16 RK |
266 | return build_type_attribute_variant (long_unsigned_type_node, |
267 | attributes); | |
400fbf9f | 268 | |
36618528 RS |
269 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node |
270 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
400fbf9f JW |
271 | { |
272 | /* But preserve unsignedness from the other type, | |
273 | since long cannot hold all the values of an unsigned int. */ | |
274 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
4b027d16 RK |
275 | t1 = long_unsigned_type_node; |
276 | else | |
277 | t1 = long_integer_type_node; | |
278 | return build_type_attribute_variant (t1, attributes); | |
400fbf9f JW |
279 | } |
280 | ||
e9a25f70 JL |
281 | /* Likewise, prefer long double to double even if same size. */ |
282 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node | |
283 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
284 | return build_type_attribute_variant (long_double_type_node, | |
285 | attributes); | |
286 | ||
400fbf9f JW |
287 | /* Otherwise prefer the unsigned one. */ |
288 | ||
289 | if (TREE_UNSIGNED (t1)) | |
4b027d16 RK |
290 | return build_type_attribute_variant (t1, attributes); |
291 | else | |
292 | return build_type_attribute_variant (t2, attributes); | |
400fbf9f JW |
293 | |
294 | case POINTER_TYPE: | |
400fbf9f JW |
295 | /* For two pointers, do this recursively on the target type, |
296 | and combine the qualifiers of the two types' targets. */ | |
8706edbc RS |
297 | /* This code was turned off; I don't know why. |
298 | But ANSI C specifies doing this with the qualifiers. | |
299 | So I turned it on again. */ | |
400fbf9f JW |
300 | { |
301 | tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)), | |
302 | TYPE_MAIN_VARIANT (TREE_TYPE (t2))); | |
303 | int constp | |
304 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
305 | int volatilep | |
306 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
4b027d16 RK |
307 | t1 = build_pointer_type (c_build_type_variant (target, constp, |
308 | volatilep)); | |
309 | return build_type_attribute_variant (t1, attributes); | |
400fbf9f | 310 | } |
8706edbc | 311 | #if 0 |
4b027d16 RK |
312 | t1 = build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); |
313 | return build_type_attribute_variant (t1, attributes); | |
8706edbc | 314 | #endif |
400fbf9f JW |
315 | |
316 | case ARRAY_TYPE: | |
317 | { | |
318 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
319 | /* Save space: see if the result is identical to one of the args. */ | |
320 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
4b027d16 | 321 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 322 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
4b027d16 | 323 | return build_type_attribute_variant (t2, attributes); |
400fbf9f | 324 | /* Merge the element types, and have a size if either arg has one. */ |
4b027d16 RK |
325 | t1 = build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); |
326 | return build_type_attribute_variant (t1, attributes); | |
400fbf9f JW |
327 | } |
328 | ||
329 | case FUNCTION_TYPE: | |
330 | /* Function types: prefer the one that specified arg types. | |
331 | If both do, merge the arg types. Also merge the return types. */ | |
332 | { | |
333 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
334 | tree p1 = TYPE_ARG_TYPES (t1); | |
335 | tree p2 = TYPE_ARG_TYPES (t2); | |
336 | int len; | |
337 | tree newargs, n; | |
338 | int i; | |
339 | ||
340 | /* Save space: see if the result is identical to one of the args. */ | |
341 | if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2)) | |
4b027d16 | 342 | return build_type_attribute_variant (t1, attributes); |
400fbf9f | 343 | if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1)) |
4b027d16 | 344 | return build_type_attribute_variant (t2, attributes); |
400fbf9f JW |
345 | |
346 | /* Simple way if one arg fails to specify argument types. */ | |
347 | if (TYPE_ARG_TYPES (t1) == 0) | |
4b027d16 RK |
348 | { |
349 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t2)); | |
350 | return build_type_attribute_variant (t1, attributes); | |
351 | } | |
400fbf9f | 352 | if (TYPE_ARG_TYPES (t2) == 0) |
4b027d16 RK |
353 | { |
354 | t1 = build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
355 | return build_type_attribute_variant (t1, attributes); | |
356 | } | |
400fbf9f JW |
357 | |
358 | /* If both args specify argument types, we must merge the two | |
359 | lists, argument by argument. */ | |
360 | ||
361 | len = list_length (p1); | |
362 | newargs = 0; | |
363 | ||
364 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 365 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
366 | |
367 | n = newargs; | |
368 | ||
369 | for (; p1; | |
370 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
371 | { | |
372 | /* A null type means arg type is not specified. | |
373 | Take whatever the other function type has. */ | |
374 | if (TREE_VALUE (p1) == 0) | |
375 | { | |
376 | TREE_VALUE (n) = TREE_VALUE (p2); | |
377 | goto parm_done; | |
378 | } | |
379 | if (TREE_VALUE (p2) == 0) | |
380 | { | |
381 | TREE_VALUE (n) = TREE_VALUE (p1); | |
382 | goto parm_done; | |
383 | } | |
384 | ||
385 | /* Given wait (union {union wait *u; int *i} *) | |
386 | and wait (union wait *), | |
387 | prefer union wait * as type of parm. */ | |
388 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
389 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
390 | { | |
391 | tree memb; | |
392 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); | |
393 | memb; memb = TREE_CHAIN (memb)) | |
394 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2))) | |
395 | { | |
396 | TREE_VALUE (n) = TREE_VALUE (p2); | |
397 | if (pedantic) | |
398 | pedwarn ("function types not truly compatible in ANSI C"); | |
399 | goto parm_done; | |
400 | } | |
401 | } | |
402 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
403 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
404 | { | |
405 | tree memb; | |
406 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); | |
407 | memb; memb = TREE_CHAIN (memb)) | |
408 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1))) | |
409 | { | |
410 | TREE_VALUE (n) = TREE_VALUE (p1); | |
411 | if (pedantic) | |
412 | pedwarn ("function types not truly compatible in ANSI C"); | |
413 | goto parm_done; | |
414 | } | |
415 | } | |
416 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
417 | parm_done: ; | |
418 | } | |
419 | ||
4b027d16 | 420 | t1 = build_function_type (valtype, newargs); |
0f41302f | 421 | /* ... falls through ... */ |
400fbf9f JW |
422 | } |
423 | ||
424 | default: | |
4b027d16 | 425 | return build_type_attribute_variant (t1, attributes); |
400fbf9f JW |
426 | } |
427 | ||
428 | } | |
429 | \f | |
430 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
431 | or various other operations. Return 2 if they are compatible | |
432 | but a warning may be needed if you use them together. */ | |
433 | ||
434 | int | |
435 | comptypes (type1, type2) | |
436 | tree type1, type2; | |
437 | { | |
438 | register tree t1 = type1; | |
439 | register tree t2 = type2; | |
4b027d16 | 440 | int attrval, val; |
400fbf9f JW |
441 | |
442 | /* Suppress errors caused by previously reported errors. */ | |
443 | ||
8d47dfc5 RH |
444 | if (t1 == t2 || !t1 || !t2 |
445 | || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
400fbf9f JW |
446 | return 1; |
447 | ||
b8c21346 RK |
448 | /* Treat an enum type as the integer type of the same width and |
449 | signedness. */ | |
400fbf9f JW |
450 | |
451 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
b8c21346 | 452 | t1 = type_for_size (TYPE_PRECISION (t1), TREE_UNSIGNED (t1)); |
400fbf9f | 453 | if (TREE_CODE (t2) == ENUMERAL_TYPE) |
b8c21346 | 454 | t2 = type_for_size (TYPE_PRECISION (t2), TREE_UNSIGNED (t2)); |
400fbf9f JW |
455 | |
456 | if (t1 == t2) | |
457 | return 1; | |
458 | ||
459 | /* Different classes of types can't be compatible. */ | |
460 | ||
461 | if (TREE_CODE (t1) != TREE_CODE (t2)) return 0; | |
462 | ||
463 | /* Qualifiers must match. */ | |
464 | ||
465 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
466 | return 0; | |
467 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) | |
468 | return 0; | |
469 | ||
08632da2 RS |
470 | /* Allow for two different type nodes which have essentially the same |
471 | definition. Note that we already checked for equality of the type | |
472 | type qualifiers (just above). */ | |
400fbf9f JW |
473 | |
474 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
475 | return 1; | |
476 | ||
4b027d16 RK |
477 | #ifndef COMP_TYPE_ATTRIBUTES |
478 | #define COMP_TYPE_ATTRIBUTES(t1,t2) 1 | |
479 | #endif | |
480 | ||
481 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
482 | if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) | |
483 | return 0; | |
484 | ||
485 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
486 | val = 0; | |
487 | ||
400fbf9f JW |
488 | switch (TREE_CODE (t1)) |
489 | { | |
490 | case POINTER_TYPE: | |
4b027d16 | 491 | val = (TREE_TYPE (t1) == TREE_TYPE (t2) |
400fbf9f | 492 | ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2))); |
4b027d16 | 493 | break; |
400fbf9f JW |
494 | |
495 | case FUNCTION_TYPE: | |
4b027d16 RK |
496 | val = function_types_compatible_p (t1, t2); |
497 | break; | |
400fbf9f JW |
498 | |
499 | case ARRAY_TYPE: | |
500 | { | |
400fbf9f JW |
501 | tree d1 = TYPE_DOMAIN (t1); |
502 | tree d2 = TYPE_DOMAIN (t2); | |
4b027d16 | 503 | val = 1; |
400fbf9f JW |
504 | |
505 | /* Target types must match incl. qualifiers. */ | |
506 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
507 | && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))) | |
508 | return 0; | |
509 | ||
510 | /* Sizes must match unless one is missing or variable. */ | |
511 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
512 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
513 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
514 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
515 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
4b027d16 | 516 | break; |
400fbf9f | 517 | |
4b027d16 | 518 | if (! ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) |
400fbf9f JW |
519 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) |
520 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
521 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
522 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
523 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
524 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
4b027d16 RK |
525 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2))))) |
526 | val = 0; | |
527 | break; | |
400fbf9f JW |
528 | } |
529 | ||
530 | case RECORD_TYPE: | |
392202b0 | 531 | if (maybe_objc_comptypes (t1, t2, 0) == 1) |
4b027d16 RK |
532 | val = 1; |
533 | break; | |
e9a25f70 JL |
534 | |
535 | default: | |
536 | break; | |
400fbf9f | 537 | } |
4b027d16 | 538 | return attrval == 2 && val == 1 ? 2 : val; |
400fbf9f JW |
539 | } |
540 | ||
541 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
542 | ignoring their qualifiers. */ | |
543 | ||
544 | static int | |
545 | comp_target_types (ttl, ttr) | |
546 | tree ttl, ttr; | |
547 | { | |
392202b0 | 548 | int val; |
8b40563c | 549 | |
392202b0 | 550 | /* Give maybe_objc_comptypes a crack at letting these types through. */ |
1d300e19 | 551 | if ((val = maybe_objc_comptypes (ttl, ttr, 1)) >= 0) |
392202b0 | 552 | return val; |
8b40563c | 553 | |
392202b0 TW |
554 | val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)), |
555 | TYPE_MAIN_VARIANT (TREE_TYPE (ttr))); | |
8b40563c | 556 | |
400fbf9f JW |
557 | if (val == 2 && pedantic) |
558 | pedwarn ("types are not quite compatible"); | |
559 | return val; | |
560 | } | |
561 | \f | |
562 | /* Subroutines of `comptypes'. */ | |
563 | ||
564 | /* Return 1 if two function types F1 and F2 are compatible. | |
565 | If either type specifies no argument types, | |
566 | the other must specify a fixed number of self-promoting arg types. | |
567 | Otherwise, if one type specifies only the number of arguments, | |
568 | the other must specify that number of self-promoting arg types. | |
569 | Otherwise, the argument types must match. */ | |
570 | ||
571 | static int | |
572 | function_types_compatible_p (f1, f2) | |
573 | tree f1, f2; | |
574 | { | |
575 | tree args1, args2; | |
576 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
577 | int val = 1; | |
578 | int val1; | |
579 | ||
580 | if (!(TREE_TYPE (f1) == TREE_TYPE (f2) | |
581 | || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2))))) | |
582 | return 0; | |
583 | ||
584 | args1 = TYPE_ARG_TYPES (f1); | |
585 | args2 = TYPE_ARG_TYPES (f2); | |
586 | ||
587 | /* An unspecified parmlist matches any specified parmlist | |
588 | whose argument types don't need default promotions. */ | |
589 | ||
590 | if (args1 == 0) | |
591 | { | |
592 | if (!self_promoting_args_p (args2)) | |
593 | return 0; | |
594 | /* If one of these types comes from a non-prototype fn definition, | |
595 | compare that with the other type's arglist. | |
596 | If they don't match, ask for a warning (but no error). */ | |
597 | if (TYPE_ACTUAL_ARG_TYPES (f1) | |
598 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) | |
599 | val = 2; | |
600 | return val; | |
601 | } | |
602 | if (args2 == 0) | |
603 | { | |
604 | if (!self_promoting_args_p (args1)) | |
605 | return 0; | |
606 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
607 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) | |
608 | val = 2; | |
609 | return val; | |
610 | } | |
611 | ||
612 | /* Both types have argument lists: compare them and propagate results. */ | |
613 | val1 = type_lists_compatible_p (args1, args2); | |
614 | return val1 != 1 ? val1 : val; | |
615 | } | |
616 | ||
617 | /* Check two lists of types for compatibility, | |
618 | returning 0 for incompatible, 1 for compatible, | |
619 | or 2 for compatible with warning. */ | |
620 | ||
621 | static int | |
622 | type_lists_compatible_p (args1, args2) | |
623 | tree args1, args2; | |
624 | { | |
625 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
626 | int val = 1; | |
9d5f3e49 | 627 | int newval = 0; |
400fbf9f JW |
628 | |
629 | while (1) | |
630 | { | |
631 | if (args1 == 0 && args2 == 0) | |
632 | return val; | |
633 | /* If one list is shorter than the other, | |
634 | they fail to match. */ | |
635 | if (args1 == 0 || args2 == 0) | |
636 | return 0; | |
637 | /* A null pointer instead of a type | |
638 | means there is supposed to be an argument | |
639 | but nothing is specified about what type it has. | |
640 | So match anything that self-promotes. */ | |
641 | if (TREE_VALUE (args1) == 0) | |
642 | { | |
643 | if (! self_promoting_type_p (TREE_VALUE (args2))) | |
644 | return 0; | |
645 | } | |
646 | else if (TREE_VALUE (args2) == 0) | |
647 | { | |
648 | if (! self_promoting_type_p (TREE_VALUE (args1))) | |
649 | return 0; | |
650 | } | |
651 | else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2)))) | |
652 | { | |
653 | /* Allow wait (union {union wait *u; int *i} *) | |
654 | and wait (union wait *) to be compatible. */ | |
655 | if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE | |
ea3373cd RK |
656 | && (TYPE_NAME (TREE_VALUE (args1)) == 0 |
657 | || TYPE_TRANSPARENT_UNION (TREE_VALUE (args1))) | |
400fbf9f JW |
658 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST |
659 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)), | |
660 | TYPE_SIZE (TREE_VALUE (args2)))) | |
661 | { | |
662 | tree memb; | |
663 | for (memb = TYPE_FIELDS (TREE_VALUE (args1)); | |
664 | memb; memb = TREE_CHAIN (memb)) | |
665 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2))) | |
666 | break; | |
667 | if (memb == 0) | |
668 | return 0; | |
669 | } | |
670 | else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE | |
ea3373cd RK |
671 | && (TYPE_NAME (TREE_VALUE (args2)) == 0 |
672 | || TYPE_TRANSPARENT_UNION (TREE_VALUE (args2))) | |
400fbf9f JW |
673 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST |
674 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)), | |
675 | TYPE_SIZE (TREE_VALUE (args1)))) | |
676 | { | |
677 | tree memb; | |
678 | for (memb = TYPE_FIELDS (TREE_VALUE (args2)); | |
679 | memb; memb = TREE_CHAIN (memb)) | |
680 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1))) | |
681 | break; | |
682 | if (memb == 0) | |
683 | return 0; | |
684 | } | |
685 | else | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /* comptypes said ok, but record if it said to warn. */ | |
690 | if (newval > val) | |
691 | val = newval; | |
692 | ||
693 | args1 = TREE_CHAIN (args1); | |
694 | args2 = TREE_CHAIN (args2); | |
695 | } | |
696 | } | |
697 | ||
698 | /* Return 1 if PARMS specifies a fixed number of parameters | |
699 | and none of their types is affected by default promotions. */ | |
700 | ||
805f961c | 701 | int |
400fbf9f JW |
702 | self_promoting_args_p (parms) |
703 | tree parms; | |
704 | { | |
705 | register tree t; | |
706 | for (t = parms; t; t = TREE_CHAIN (t)) | |
707 | { | |
708 | register tree type = TREE_VALUE (t); | |
709 | ||
710 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
711 | return 0; | |
712 | ||
d627ed1b RS |
713 | if (type == 0) |
714 | return 0; | |
715 | ||
6cb72a7d | 716 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
717 | return 0; |
718 | ||
d627ed1b | 719 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
720 | return 0; |
721 | } | |
722 | return 1; | |
723 | } | |
724 | ||
725 | /* Return 1 if TYPE is not affected by default promotions. */ | |
726 | ||
727 | static int | |
728 | self_promoting_type_p (type) | |
729 | tree type; | |
730 | { | |
6cb72a7d | 731 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
732 | return 0; |
733 | ||
d627ed1b | 734 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
735 | return 0; |
736 | ||
737 | return 1; | |
738 | } | |
739 | \f | |
740 | /* Return an unsigned type the same as TYPE in other respects. */ | |
741 | ||
742 | tree | |
743 | unsigned_type (type) | |
744 | tree type; | |
745 | { | |
6cb72a7d RS |
746 | tree type1 = TYPE_MAIN_VARIANT (type); |
747 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
400fbf9f | 748 | return unsigned_char_type_node; |
6cb72a7d | 749 | if (type1 == integer_type_node) |
400fbf9f | 750 | return unsigned_type_node; |
6cb72a7d | 751 | if (type1 == short_integer_type_node) |
400fbf9f | 752 | return short_unsigned_type_node; |
6cb72a7d | 753 | if (type1 == long_integer_type_node) |
400fbf9f | 754 | return long_unsigned_type_node; |
6cb72a7d | 755 | if (type1 == long_long_integer_type_node) |
400fbf9f | 756 | return long_long_unsigned_type_node; |
fb695d4a RK |
757 | if (type1 == intDI_type_node) |
758 | return unsigned_intDI_type_node; | |
759 | if (type1 == intSI_type_node) | |
760 | return unsigned_intSI_type_node; | |
761 | if (type1 == intHI_type_node) | |
762 | return unsigned_intHI_type_node; | |
763 | if (type1 == intQI_type_node) | |
764 | return unsigned_intQI_type_node; | |
f63f0752 RK |
765 | |
766 | return signed_or_unsigned_type (1, type); | |
400fbf9f JW |
767 | } |
768 | ||
769 | /* Return a signed type the same as TYPE in other respects. */ | |
770 | ||
771 | tree | |
772 | signed_type (type) | |
773 | tree type; | |
774 | { | |
6cb72a7d RS |
775 | tree type1 = TYPE_MAIN_VARIANT (type); |
776 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
400fbf9f | 777 | return signed_char_type_node; |
6cb72a7d | 778 | if (type1 == unsigned_type_node) |
400fbf9f | 779 | return integer_type_node; |
6cb72a7d | 780 | if (type1 == short_unsigned_type_node) |
400fbf9f | 781 | return short_integer_type_node; |
6cb72a7d | 782 | if (type1 == long_unsigned_type_node) |
400fbf9f | 783 | return long_integer_type_node; |
6cb72a7d | 784 | if (type1 == long_long_unsigned_type_node) |
400fbf9f | 785 | return long_long_integer_type_node; |
fb695d4a RK |
786 | if (type1 == unsigned_intDI_type_node) |
787 | return intDI_type_node; | |
788 | if (type1 == unsigned_intSI_type_node) | |
789 | return intSI_type_node; | |
790 | if (type1 == unsigned_intHI_type_node) | |
791 | return intHI_type_node; | |
792 | if (type1 == unsigned_intQI_type_node) | |
793 | return intQI_type_node; | |
f63f0752 RK |
794 | |
795 | return signed_or_unsigned_type (0, type); | |
400fbf9f JW |
796 | } |
797 | ||
798 | /* Return a type the same as TYPE except unsigned or | |
799 | signed according to UNSIGNEDP. */ | |
800 | ||
801 | tree | |
802 | signed_or_unsigned_type (unsignedp, type) | |
803 | int unsignedp; | |
804 | tree type; | |
805 | { | |
3c967567 RK |
806 | if (! INTEGRAL_TYPE_P (type) |
807 | || TREE_UNSIGNED (type) == unsignedp) | |
400fbf9f JW |
808 | return type; |
809 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) | |
810 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
811 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
812 | return unsignedp ? unsigned_type_node : integer_type_node; | |
813 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
814 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
815 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
816 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
817 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
818 | return (unsignedp ? long_long_unsigned_type_node | |
819 | : long_long_integer_type_node); | |
820 | return type; | |
821 | } | |
822 | ||
823 | /* Compute the value of the `sizeof' operator. */ | |
824 | ||
825 | tree | |
826 | c_sizeof (type) | |
827 | tree type; | |
828 | { | |
829 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 830 | tree t; |
400fbf9f JW |
831 | |
832 | if (code == FUNCTION_TYPE) | |
833 | { | |
834 | if (pedantic || warn_pointer_arith) | |
835 | pedwarn ("sizeof applied to a function type"); | |
836 | return size_int (1); | |
837 | } | |
838 | if (code == VOID_TYPE) | |
839 | { | |
840 | if (pedantic || warn_pointer_arith) | |
841 | pedwarn ("sizeof applied to a void type"); | |
842 | return size_int (1); | |
843 | } | |
844 | if (code == ERROR_MARK) | |
845 | return size_int (1); | |
846 | if (TYPE_SIZE (type) == 0) | |
847 | { | |
848 | error ("sizeof applied to an incomplete type"); | |
849 | return size_int (0); | |
850 | } | |
851 | ||
852 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
853 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
854 | size_int (TYPE_PRECISION (char_type_node))); | |
f8dac6eb | 855 | t = convert (sizetype, t); |
fa427131 | 856 | /* size_binop does not put the constant in range, so do it now. */ |
10d5caec PE |
857 | if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) |
858 | TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; | |
f7c8fb3f | 859 | return t; |
400fbf9f JW |
860 | } |
861 | ||
862 | tree | |
863 | c_sizeof_nowarn (type) | |
864 | tree type; | |
865 | { | |
866 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 867 | tree t; |
400fbf9f JW |
868 | |
869 | if (code == FUNCTION_TYPE | |
870 | || code == VOID_TYPE | |
871 | || code == ERROR_MARK) | |
872 | return size_int (1); | |
873 | if (TYPE_SIZE (type) == 0) | |
874 | return size_int (0); | |
875 | ||
876 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
877 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
878 | size_int (TYPE_PRECISION (char_type_node))); | |
f8dac6eb | 879 | t = convert (sizetype, t); |
e58cd767 | 880 | force_fit_type (t, 0); |
f7c8fb3f | 881 | return t; |
400fbf9f JW |
882 | } |
883 | ||
884 | /* Compute the size to increment a pointer by. */ | |
885 | ||
886 | tree | |
887 | c_size_in_bytes (type) | |
888 | tree type; | |
889 | { | |
890 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 891 | tree t; |
400fbf9f JW |
892 | |
893 | if (code == FUNCTION_TYPE) | |
894 | return size_int (1); | |
895 | if (code == VOID_TYPE) | |
896 | return size_int (1); | |
897 | if (code == ERROR_MARK) | |
898 | return size_int (1); | |
899 | if (TYPE_SIZE (type) == 0) | |
900 | { | |
901 | error ("arithmetic on pointer to an incomplete type"); | |
902 | return size_int (1); | |
903 | } | |
904 | ||
905 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f | 906 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
400fbf9f | 907 | size_int (BITS_PER_UNIT)); |
f8dac6eb | 908 | t = convert (sizetype, t); |
e58cd767 | 909 | force_fit_type (t, 0); |
f7c8fb3f | 910 | return t; |
400fbf9f JW |
911 | } |
912 | ||
913 | /* Implement the __alignof keyword: Return the minimum required | |
914 | alignment of TYPE, measured in bytes. */ | |
915 | ||
916 | tree | |
917 | c_alignof (type) | |
918 | tree type; | |
919 | { | |
920 | enum tree_code code = TREE_CODE (type); | |
921 | ||
922 | if (code == FUNCTION_TYPE) | |
923 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
924 | ||
925 | if (code == VOID_TYPE || code == ERROR_MARK) | |
926 | return size_int (1); | |
927 | ||
928 | return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
929 | } | |
930 | \f | |
931 | /* Implement the __alignof keyword: Return the minimum required | |
932 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
933 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
934 | "aligned" __attribute__ specification). */ | |
9e9bd45d | 935 | |
400fbf9f JW |
936 | tree |
937 | c_alignof_expr (expr) | |
938 | tree expr; | |
939 | { | |
940 | if (TREE_CODE (expr) == VAR_DECL) | |
941 | return size_int (DECL_ALIGN (expr) / BITS_PER_UNIT); | |
942 | ||
943 | if (TREE_CODE (expr) == COMPONENT_REF | |
ef86d2a6 | 944 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) |
400fbf9f JW |
945 | { |
946 | error ("`__alignof' applied to a bit-field"); | |
947 | return size_int (1); | |
948 | } | |
949 | else if (TREE_CODE (expr) == COMPONENT_REF | |
950 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) | |
951 | return size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT); | |
952 | ||
953 | if (TREE_CODE (expr) == INDIRECT_REF) | |
954 | { | |
955 | tree t = TREE_OPERAND (expr, 0); | |
956 | tree best = t; | |
957 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
958 | ||
959 | while (TREE_CODE (t) == NOP_EXPR | |
960 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) | |
961 | { | |
962 | int thisalign; | |
963 | ||
964 | t = TREE_OPERAND (t, 0); | |
965 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
966 | if (thisalign > bestalign) | |
967 | best = t, bestalign = thisalign; | |
968 | } | |
969 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
970 | } | |
971 | else | |
972 | return c_alignof (TREE_TYPE (expr)); | |
973 | } | |
a7c1916a | 974 | |
400fbf9f JW |
975 | /* Return either DECL or its known constant value (if it has one). */ |
976 | ||
977 | static tree | |
978 | decl_constant_value (decl) | |
979 | tree decl; | |
980 | { | |
a7c1916a | 981 | if (/* Don't change a variable array bound or initial value to a constant |
400fbf9f | 982 | in a place where a variable is invalid. */ |
a7c1916a | 983 | current_function_decl != 0 |
400fbf9f JW |
984 | && ! pedantic |
985 | && ! TREE_THIS_VOLATILE (decl) | |
8c3a6477 | 986 | && TREE_READONLY (decl) && ! ITERATOR_P (decl) |
400fbf9f JW |
987 | && DECL_INITIAL (decl) != 0 |
988 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
989 | /* This is invalid if initial value is not constant. | |
990 | If it has either a function call, a memory reference, | |
991 | or a variable, then re-evaluating it could give different results. */ | |
992 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
993 | /* Check for cases where this is sub-optimal, even though valid. */ | |
994 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR | |
995 | && DECL_MODE (decl) != BLKmode) | |
996 | return DECL_INITIAL (decl); | |
997 | return decl; | |
998 | } | |
999 | ||
1000 | /* Perform default promotions for C data used in expressions. | |
1001 | Arrays and functions are converted to pointers; | |
1002 | enumeral types or short or char, to int. | |
1003 | In addition, manifest constants symbols are replaced by their values. */ | |
1004 | ||
1005 | tree | |
1006 | default_conversion (exp) | |
1007 | tree exp; | |
1008 | { | |
1009 | register tree type = TREE_TYPE (exp); | |
1010 | register enum tree_code code = TREE_CODE (type); | |
1011 | ||
1012 | /* Constants can be used directly unless they're not loadable. */ | |
1013 | if (TREE_CODE (exp) == CONST_DECL) | |
1014 | exp = DECL_INITIAL (exp); | |
d4424a75 RK |
1015 | |
1016 | /* Replace a nonvolatile const static variable with its value unless | |
1017 | it is an array, in which case we must be sure that taking the | |
1018 | address of the array produces consistent results. */ | |
1019 | else if (optimize && TREE_CODE (exp) == VAR_DECL && code != ARRAY_TYPE) | |
400fbf9f JW |
1020 | { |
1021 | exp = decl_constant_value (exp); | |
1022 | type = TREE_TYPE (exp); | |
1023 | } | |
1024 | ||
a7d53fce RS |
1025 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as |
1026 | an lvalue. */ | |
1027 | /* Do not use STRIP_NOPS here! It will remove conversions from pointer | |
1028 | to integer and cause infinite recursion. */ | |
1029 | while (TREE_CODE (exp) == NON_LVALUE_EXPR | |
1030 | || (TREE_CODE (exp) == NOP_EXPR | |
1031 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
1032 | exp = TREE_OPERAND (exp, 0); | |
400fbf9f JW |
1033 | |
1034 | /* Normally convert enums to int, | |
1035 | but convert wide enums to something wider. */ | |
1036 | if (code == ENUMERAL_TYPE) | |
1037 | { | |
1038 | type = type_for_size (MAX (TYPE_PRECISION (type), | |
1039 | TYPE_PRECISION (integer_type_node)), | |
86463d5d | 1040 | ((flag_traditional |
e9a25f70 JL |
1041 | || (TYPE_PRECISION (type) |
1042 | >= TYPE_PRECISION (integer_type_node))) | |
86463d5d | 1043 | && TREE_UNSIGNED (type))); |
400fbf9f JW |
1044 | return convert (type, exp); |
1045 | } | |
1046 | ||
9753f113 | 1047 | if (TREE_CODE (exp) == COMPONENT_REF |
e9a25f70 | 1048 | && DECL_C_BIT_FIELD (TREE_OPERAND (exp, 1))) |
9753f113 | 1049 | { |
cff9c407 RK |
1050 | tree width = DECL_SIZE (TREE_OPERAND (exp, 1)); |
1051 | HOST_WIDE_INT low = TREE_INT_CST_LOW (width); | |
9753f113 | 1052 | |
cff9c407 RK |
1053 | /* If it's thinner than an int, promote it like a |
1054 | C_PROMOTING_INTEGER_TYPE_P, otherwise leave it alone. */ | |
9753f113 | 1055 | |
cff9c407 RK |
1056 | if (low < TYPE_PRECISION (integer_type_node)) |
1057 | { | |
1058 | if (flag_traditional && TREE_UNSIGNED (type)) | |
1059 | return convert (unsigned_type_node, exp); | |
1060 | else | |
1061 | return convert (integer_type_node, exp); | |
1062 | } | |
9753f113 RK |
1063 | } |
1064 | ||
d627ed1b | 1065 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f | 1066 | { |
e83d45c4 RS |
1067 | /* Traditionally, unsignedness is preserved in default promotions. |
1068 | Also preserve unsignedness if not really getting any wider. */ | |
1069 | if (TREE_UNSIGNED (type) | |
1070 | && (flag_traditional | |
1071 | || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) | |
400fbf9f JW |
1072 | return convert (unsigned_type_node, exp); |
1073 | return convert (integer_type_node, exp); | |
1074 | } | |
19d76e60 RK |
1075 | if (flag_traditional && !flag_allow_single_precision |
1076 | && TYPE_MAIN_VARIANT (type) == float_type_node) | |
400fbf9f JW |
1077 | return convert (double_type_node, exp); |
1078 | if (code == VOID_TYPE) | |
1079 | { | |
1080 | error ("void value not ignored as it ought to be"); | |
1081 | return error_mark_node; | |
1082 | } | |
1083 | if (code == FUNCTION_TYPE) | |
1084 | { | |
1085 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1086 | } | |
1087 | if (code == ARRAY_TYPE) | |
1088 | { | |
1089 | register tree adr; | |
1090 | tree restype = TREE_TYPE (type); | |
1091 | tree ptrtype; | |
d11fdb45 RS |
1092 | int constp = 0; |
1093 | int volatilep = 0; | |
1094 | ||
1095 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' | |
1096 | || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
1097 | { | |
1098 | constp = TREE_READONLY (exp); | |
1099 | volatilep = TREE_THIS_VOLATILE (exp); | |
1100 | } | |
1101 | ||
1102 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type) | |
1103 | || constp || volatilep) | |
1104 | restype = c_build_type_variant (restype, | |
1105 | TYPE_READONLY (type) || constp, | |
1106 | TYPE_VOLATILE (type) || volatilep); | |
400fbf9f JW |
1107 | |
1108 | if (TREE_CODE (exp) == INDIRECT_REF) | |
1109 | return convert (TYPE_POINTER_TO (restype), | |
1110 | TREE_OPERAND (exp, 0)); | |
1111 | ||
1112 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
1113 | { | |
1114 | tree op1 = default_conversion (TREE_OPERAND (exp, 1)); | |
1115 | return build (COMPOUND_EXPR, TREE_TYPE (op1), | |
1116 | TREE_OPERAND (exp, 0), op1); | |
1117 | } | |
1118 | ||
cff9c407 | 1119 | if (! lvalue_p (exp) |
400fbf9f JW |
1120 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) |
1121 | { | |
8efabd13 RS |
1122 | error ("invalid use of non-lvalue array"); |
1123 | return error_mark_node; | |
400fbf9f JW |
1124 | } |
1125 | ||
400fbf9f JW |
1126 | ptrtype = build_pointer_type (restype); |
1127 | ||
1128 | if (TREE_CODE (exp) == VAR_DECL) | |
1129 | { | |
1130 | /* ??? This is not really quite correct | |
1131 | in that the type of the operand of ADDR_EXPR | |
1132 | is not the target type of the type of the ADDR_EXPR itself. | |
1133 | Question is, can this lossage be avoided? */ | |
1134 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1135 | if (mark_addressable (exp) == 0) | |
1136 | return error_mark_node; | |
1137 | TREE_CONSTANT (adr) = staticp (exp); | |
1138 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1139 | return adr; | |
1140 | } | |
1141 | /* This way is better for a COMPONENT_REF since it can | |
1142 | simplify the offset for a component. */ | |
1143 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1144 | return convert (ptrtype, adr); | |
1145 | } | |
1146 | return exp; | |
1147 | } | |
1148 | \f | |
19d76e60 RK |
1149 | /* Look up component name in the structure type definition. |
1150 | ||
1151 | If this component name is found indirectly within an anonymous union, | |
1152 | store in *INDIRECT the component which directly contains | |
1153 | that anonymous union. Otherwise, set *INDIRECT to 0. */ | |
2f2d13da DE |
1154 | |
1155 | static tree | |
19d76e60 | 1156 | lookup_field (type, component, indirect) |
2f2d13da | 1157 | tree type, component; |
19d76e60 | 1158 | tree *indirect; |
2f2d13da DE |
1159 | { |
1160 | tree field; | |
1161 | ||
1162 | /* If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1163 | to the field elements. Use a binary search on this array to quickly | |
1164 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1165 | will always be set for structures which have many elements. */ | |
1166 | ||
1167 | if (TYPE_LANG_SPECIFIC (type)) | |
1168 | { | |
1169 | int bot, top, half; | |
1170 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0]; | |
1171 | ||
1172 | field = TYPE_FIELDS (type); | |
1173 | bot = 0; | |
1174 | top = TYPE_LANG_SPECIFIC (type)->len; | |
1175 | while (top - bot > 1) | |
1176 | { | |
2f2d13da DE |
1177 | half = (top - bot + 1) >> 1; |
1178 | field = field_array[bot+half]; | |
1179 | ||
1180 | if (DECL_NAME (field) == NULL_TREE) | |
1181 | { | |
1182 | /* Step through all anon unions in linear fashion. */ | |
1183 | while (DECL_NAME (field_array[bot]) == NULL_TREE) | |
1184 | { | |
a68b98cf | 1185 | tree anon = 0, junk; |
19d76e60 | 1186 | |
2f2d13da | 1187 | field = field_array[bot++]; |
a68b98cf RK |
1188 | if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
1189 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
1190 | anon = lookup_field (TREE_TYPE (field), component, &junk); | |
1191 | ||
2f2d13da | 1192 | if (anon != NULL_TREE) |
19d76e60 RK |
1193 | { |
1194 | *indirect = field; | |
1195 | return anon; | |
1196 | } | |
2f2d13da DE |
1197 | } |
1198 | ||
1199 | /* Entire record is only anon unions. */ | |
1200 | if (bot > top) | |
1201 | return NULL_TREE; | |
1202 | ||
1203 | /* Restart the binary search, with new lower bound. */ | |
1204 | continue; | |
1205 | } | |
1206 | ||
e8b87aac | 1207 | if (DECL_NAME (field) == component) |
2f2d13da | 1208 | break; |
e8b87aac | 1209 | if (DECL_NAME (field) < component) |
2f2d13da DE |
1210 | bot += half; |
1211 | else | |
1212 | top = bot + half; | |
1213 | } | |
1214 | ||
1215 | if (DECL_NAME (field_array[bot]) == component) | |
1216 | field = field_array[bot]; | |
1217 | else if (DECL_NAME (field) != component) | |
1218 | field = 0; | |
1219 | } | |
1220 | else | |
1221 | { | |
1222 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1223 | { | |
1224 | if (DECL_NAME (field) == NULL_TREE) | |
1225 | { | |
19d76e60 | 1226 | tree junk; |
a68b98cf RK |
1227 | tree anon = 0; |
1228 | ||
1229 | if (TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
1230 | || TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
1231 | anon = lookup_field (TREE_TYPE (field), component, &junk); | |
1232 | ||
2f2d13da | 1233 | if (anon != NULL_TREE) |
19d76e60 RK |
1234 | { |
1235 | *indirect = field; | |
1236 | return anon; | |
1237 | } | |
2f2d13da DE |
1238 | } |
1239 | ||
1240 | if (DECL_NAME (field) == component) | |
1241 | break; | |
1242 | } | |
1243 | } | |
1244 | ||
19d76e60 | 1245 | *indirect = NULL_TREE; |
2f2d13da DE |
1246 | return field; |
1247 | } | |
1248 | ||
400fbf9f JW |
1249 | /* Make an expression to refer to the COMPONENT field of |
1250 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1251 | ||
1252 | tree | |
1253 | build_component_ref (datum, component) | |
1254 | tree datum, component; | |
1255 | { | |
1256 | register tree type = TREE_TYPE (datum); | |
1257 | register enum tree_code code = TREE_CODE (type); | |
1258 | register tree field = NULL; | |
1259 | register tree ref; | |
1260 | ||
1261 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it | |
1262 | unless we are not to support things not strictly ANSI. */ | |
1263 | switch (TREE_CODE (datum)) | |
1264 | { | |
1265 | case COMPOUND_EXPR: | |
1266 | { | |
1267 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component); | |
400fbf9f JW |
1268 | return build (COMPOUND_EXPR, TREE_TYPE (value), |
1269 | TREE_OPERAND (datum, 0), value); | |
1270 | } | |
1271 | case COND_EXPR: | |
400fbf9f JW |
1272 | return build_conditional_expr |
1273 | (TREE_OPERAND (datum, 0), | |
1274 | build_component_ref (TREE_OPERAND (datum, 1), component), | |
1275 | build_component_ref (TREE_OPERAND (datum, 2), component)); | |
e9a25f70 JL |
1276 | |
1277 | default: | |
1278 | break; | |
400fbf9f JW |
1279 | } |
1280 | ||
1281 | /* See if there is a field or component with name COMPONENT. */ | |
1282 | ||
1283 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1284 | { | |
19d76e60 RK |
1285 | tree indirect = 0; |
1286 | ||
400fbf9f JW |
1287 | if (TYPE_SIZE (type) == 0) |
1288 | { | |
8d9bfdc5 | 1289 | incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1290 | return error_mark_node; |
1291 | } | |
1292 | ||
19d76e60 | 1293 | field = lookup_field (type, component, &indirect); |
400fbf9f JW |
1294 | |
1295 | if (!field) | |
1296 | { | |
1297 | error (code == RECORD_TYPE | |
1298 | ? "structure has no member named `%s'" | |
1299 | : "union has no member named `%s'", | |
1300 | IDENTIFIER_POINTER (component)); | |
1301 | return error_mark_node; | |
1302 | } | |
1303 | if (TREE_TYPE (field) == error_mark_node) | |
1304 | return error_mark_node; | |
1305 | ||
19d76e60 RK |
1306 | /* If FIELD was found buried within an anonymous union, |
1307 | make one COMPONENT_REF to get that anonymous union, | |
1308 | then fall thru to make a second COMPONENT_REF to get FIELD. */ | |
1309 | if (indirect != 0) | |
1310 | { | |
1311 | ref = build (COMPONENT_REF, TREE_TYPE (indirect), datum, indirect); | |
1312 | if (TREE_READONLY (datum) || TREE_READONLY (indirect)) | |
1313 | TREE_READONLY (ref) = 1; | |
1314 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (indirect)) | |
1315 | TREE_THIS_VOLATILE (ref) = 1; | |
1316 | datum = ref; | |
1317 | } | |
1318 | ||
400fbf9f JW |
1319 | ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); |
1320 | ||
1321 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1322 | TREE_READONLY (ref) = 1; | |
1323 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1324 | TREE_THIS_VOLATILE (ref) = 1; | |
1325 | ||
1326 | return ref; | |
1327 | } | |
1328 | else if (code != ERROR_MARK) | |
1329 | error ("request for member `%s' in something not a structure or union", | |
1330 | IDENTIFIER_POINTER (component)); | |
1331 | ||
1332 | return error_mark_node; | |
1333 | } | |
1334 | \f | |
1335 | /* Given an expression PTR for a pointer, return an expression | |
1336 | for the value pointed to. | |
1337 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1338 | ||
1339 | tree | |
1340 | build_indirect_ref (ptr, errorstring) | |
1341 | tree ptr; | |
1342 | char *errorstring; | |
1343 | { | |
1344 | register tree pointer = default_conversion (ptr); | |
1345 | register tree type = TREE_TYPE (pointer); | |
1346 | ||
1347 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b RS |
1348 | { |
1349 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1350 | && !flag_volatile | |
1351 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) | |
1352 | == TREE_TYPE (type))) | |
1353 | return TREE_OPERAND (pointer, 0); | |
1354 | else | |
1355 | { | |
1356 | tree t = TREE_TYPE (type); | |
1357 | register tree ref = build1 (INDIRECT_REF, | |
1358 | TYPE_MAIN_VARIANT (t), pointer); | |
400fbf9f | 1359 | |
870cc33b RS |
1360 | if (TYPE_SIZE (t) == 0 && TREE_CODE (t) != ARRAY_TYPE) |
1361 | { | |
1362 | error ("dereferencing pointer to incomplete type"); | |
1363 | return error_mark_node; | |
1364 | } | |
bd5b5c85 | 1365 | if (TREE_CODE (t) == VOID_TYPE && skip_evaluation == 0) |
870cc33b RS |
1366 | warning ("dereferencing `void *' pointer"); |
1367 | ||
1368 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
1369 | so that we get the proper error message if the result is used | |
1370 | to assign to. Also, &* is supposed to be a no-op. | |
1371 | And ANSI C seems to specify that the type of the result | |
1372 | should be the const type. */ | |
1373 | /* A de-reference of a pointer to const is not a const. It is valid | |
1374 | to change it via some other pointer. */ | |
1375 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
1376 | TREE_SIDE_EFFECTS (ref) | |
1377 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile; | |
493692cd | 1378 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); |
870cc33b RS |
1379 | return ref; |
1380 | } | |
1381 | } | |
400fbf9f JW |
1382 | else if (TREE_CODE (pointer) != ERROR_MARK) |
1383 | error ("invalid type argument of `%s'", errorstring); | |
1384 | return error_mark_node; | |
1385 | } | |
1386 | ||
1387 | /* This handles expressions of the form "a[i]", which denotes | |
1388 | an array reference. | |
1389 | ||
1390 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
1391 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
1392 | This avoids forcing the array out of registers, and can work on | |
1393 | arrays that are not lvalues (for example, members of structures returned | |
1394 | by functions). */ | |
1395 | ||
1396 | tree | |
1397 | build_array_ref (array, index) | |
1398 | tree array, index; | |
1399 | { | |
1400 | if (index == 0) | |
1401 | { | |
1402 | error ("subscript missing in array reference"); | |
1403 | return error_mark_node; | |
1404 | } | |
1405 | ||
1406 | if (TREE_TYPE (array) == error_mark_node | |
1407 | || TREE_TYPE (index) == error_mark_node) | |
1408 | return error_mark_node; | |
1409 | ||
1410 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE | |
1411 | && TREE_CODE (array) != INDIRECT_REF) | |
1412 | { | |
1413 | tree rval, type; | |
1414 | ||
400fbf9f JW |
1415 | /* Subscripting with type char is likely to lose |
1416 | on a machine where chars are signed. | |
1417 | So warn on any machine, but optionally. | |
1418 | Don't warn for unsigned char since that type is safe. | |
1419 | Don't warn for signed char because anyone who uses that | |
1420 | must have done so deliberately. */ | |
1421 | if (warn_char_subscripts | |
1422 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1423 | warning ("array subscript has type `char'"); | |
1424 | ||
0e51ef9b RS |
1425 | /* Apply default promotions *after* noticing character types. */ |
1426 | index = default_conversion (index); | |
1427 | ||
fdeefd49 RS |
1428 | /* Require integer *after* promotion, for sake of enums. */ |
1429 | if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE) | |
1430 | { | |
1431 | error ("array subscript is not an integer"); | |
1432 | return error_mark_node; | |
1433 | } | |
1434 | ||
400fbf9f JW |
1435 | /* An array that is indexed by a non-constant |
1436 | cannot be stored in a register; we must be able to do | |
1437 | address arithmetic on its address. | |
1438 | Likewise an array of elements of variable size. */ | |
1439 | if (TREE_CODE (index) != INTEGER_CST | |
1440 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
1441 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
1442 | { | |
1443 | if (mark_addressable (array) == 0) | |
1444 | return error_mark_node; | |
1445 | } | |
e6d52559 JW |
1446 | /* An array that is indexed by a constant value which is not within |
1447 | the array bounds cannot be stored in a register either; because we | |
1448 | would get a crash in store_bit_field/extract_bit_field when trying | |
1449 | to access a non-existent part of the register. */ | |
1450 | if (TREE_CODE (index) == INTEGER_CST | |
1451 | && TYPE_VALUES (TREE_TYPE (array)) | |
1452 | && ! int_fits_type_p (index, TYPE_VALUES (TREE_TYPE (array)))) | |
1453 | { | |
1454 | if (mark_addressable (array) == 0) | |
1455 | return error_mark_node; | |
1456 | } | |
400fbf9f JW |
1457 | |
1458 | if (pedantic && !lvalue_p (array)) | |
1459 | { | |
1394aabd | 1460 | if (DECL_REGISTER (array)) |
400fbf9f JW |
1461 | pedwarn ("ANSI C forbids subscripting `register' array"); |
1462 | else | |
1463 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); | |
1464 | } | |
1465 | ||
1466 | if (pedantic) | |
1467 | { | |
1468 | tree foo = array; | |
1469 | while (TREE_CODE (foo) == COMPONENT_REF) | |
1470 | foo = TREE_OPERAND (foo, 0); | |
1394aabd | 1471 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) |
400fbf9f JW |
1472 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); |
1473 | } | |
1474 | ||
1475 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
1476 | rval = build (ARRAY_REF, type, array, index); | |
1477 | /* Array ref is const/volatile if the array elements are | |
1478 | or if the array is. */ | |
1479 | TREE_READONLY (rval) | |
1480 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
1481 | | TREE_READONLY (array)); | |
1482 | TREE_SIDE_EFFECTS (rval) | |
1483 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1484 | | TREE_SIDE_EFFECTS (array)); | |
1485 | TREE_THIS_VOLATILE (rval) | |
1486 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1487 | /* This was added by rms on 16 Nov 91. | |
1488 | It fixes vol struct foo *a; a->elts[1] | |
1489 | in an inline function. | |
1490 | Hope it doesn't break something else. */ | |
1491 | | TREE_THIS_VOLATILE (array)); | |
1492 | return require_complete_type (fold (rval)); | |
1493 | } | |
1494 | ||
1495 | { | |
1496 | tree ar = default_conversion (array); | |
1497 | tree ind = default_conversion (index); | |
1498 | ||
aed11452 RK |
1499 | /* Do the same warning check as above, but only on the part that's |
1500 | syntactically the index and only if it is also semantically | |
1501 | the index. */ | |
1502 | if (warn_char_subscripts | |
1503 | && TREE_CODE (TREE_TYPE (index)) == INTEGER_TYPE | |
1504 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1505 | warning ("subscript has type `char'"); | |
1506 | ||
400fbf9f JW |
1507 | /* Put the integer in IND to simplify error checking. */ |
1508 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
1509 | { | |
1510 | tree temp = ar; | |
1511 | ar = ind; | |
1512 | ind = temp; | |
1513 | } | |
1514 | ||
1515 | if (ar == error_mark_node) | |
1516 | return ar; | |
1517 | ||
004252d7 RK |
1518 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE |
1519 | || TREE_CODE (TREE_TYPE (TREE_TYPE (ar))) == FUNCTION_TYPE) | |
400fbf9f JW |
1520 | { |
1521 | error ("subscripted value is neither array nor pointer"); | |
1522 | return error_mark_node; | |
1523 | } | |
1524 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
1525 | { | |
1526 | error ("array subscript is not an integer"); | |
1527 | return error_mark_node; | |
1528 | } | |
1529 | ||
1530 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0), | |
1531 | "array indexing"); | |
1532 | } | |
1533 | } | |
1534 | \f | |
400fbf9f JW |
1535 | /* Build a function call to function FUNCTION with parameters PARAMS. |
1536 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
1537 | TREE_VALUE of each node is a parameter-expression. | |
1538 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
1539 | ||
1540 | tree | |
1541 | build_function_call (function, params) | |
1542 | tree function, params; | |
1543 | { | |
346d29dc | 1544 | register tree fntype, fundecl = 0; |
400fbf9f | 1545 | register tree coerced_params; |
19d76e60 | 1546 | tree name = NULL_TREE, assembler_name = NULL_TREE; |
400fbf9f | 1547 | |
fc76e425 | 1548 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 1549 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
1550 | |
1551 | /* Convert anything with function type to a pointer-to-function. */ | |
1552 | if (TREE_CODE (function) == FUNCTION_DECL) | |
1553 | { | |
1554 | name = DECL_NAME (function); | |
19d76e60 RK |
1555 | assembler_name = DECL_ASSEMBLER_NAME (function); |
1556 | ||
400fbf9f JW |
1557 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
1558 | (because calling an inline function does not mean the function | |
1559 | needs to be separately compiled). */ | |
1560 | fntype = build_type_variant (TREE_TYPE (function), | |
1561 | TREE_READONLY (function), | |
1562 | TREE_THIS_VOLATILE (function)); | |
9b7267b8 | 1563 | fundecl = function; |
400fbf9f JW |
1564 | function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); |
1565 | } | |
1566 | else | |
1567 | function = default_conversion (function); | |
1568 | ||
1569 | fntype = TREE_TYPE (function); | |
1570 | ||
1571 | if (TREE_CODE (fntype) == ERROR_MARK) | |
1572 | return error_mark_node; | |
1573 | ||
1574 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
1575 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
1576 | { | |
1577 | error ("called object is not a function"); | |
1578 | return error_mark_node; | |
1579 | } | |
1580 | ||
1581 | /* fntype now gets the type of function pointed to. */ | |
1582 | fntype = TREE_TYPE (fntype); | |
1583 | ||
1584 | /* Convert the parameters to the types declared in the | |
1585 | function prototype, or apply default promotions. */ | |
1586 | ||
1587 | coerced_params | |
9b7267b8 | 1588 | = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl); |
400fbf9f JW |
1589 | |
1590 | /* Check for errors in format strings. */ | |
400fbf9f | 1591 | |
19d76e60 RK |
1592 | if (warn_format && (name || assembler_name)) |
1593 | check_function_format (name, assembler_name, coerced_params); | |
400fbf9f JW |
1594 | |
1595 | /* Recognize certain built-in functions so we can make tree-codes | |
1596 | other than CALL_EXPR. We do this when it enables fold-const.c | |
1597 | to do something useful. */ | |
1598 | ||
1599 | if (TREE_CODE (function) == ADDR_EXPR | |
1600 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
1601 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
1602 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
1603 | { | |
1604 | case BUILT_IN_ABS: | |
1605 | case BUILT_IN_LABS: | |
1606 | case BUILT_IN_FABS: | |
1607 | if (coerced_params == 0) | |
1608 | return integer_zero_node; | |
1609 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
e9a25f70 JL |
1610 | default: |
1611 | break; | |
400fbf9f JW |
1612 | } |
1613 | ||
1614 | { | |
1615 | register tree result | |
1616 | = build (CALL_EXPR, TREE_TYPE (fntype), | |
1617 | function, coerced_params, NULL_TREE); | |
1618 | ||
1619 | TREE_SIDE_EFFECTS (result) = 1; | |
1620 | if (TREE_TYPE (result) == void_type_node) | |
1621 | return result; | |
1622 | return require_complete_type (result); | |
1623 | } | |
1624 | } | |
1625 | \f | |
1626 | /* Convert the argument expressions in the list VALUES | |
1627 | to the types in the list TYPELIST. The result is a list of converted | |
1628 | argument expressions. | |
1629 | ||
1630 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
1631 | perform the default conversions. | |
1632 | ||
1633 | PARMLIST is the chain of parm decls for the function being called. | |
1634 | It may be 0, if that info is not available. | |
1635 | It is used only for generating error messages. | |
1636 | ||
1637 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
1638 | ||
1639 | This is also where warnings about wrong number of args are generated. | |
1640 | ||
1641 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
1642 | with the elements of the list in the TREE_VALUE slots of those nodes. */ | |
1643 | ||
1644 | static tree | |
9b7267b8 RS |
1645 | convert_arguments (typelist, values, name, fundecl) |
1646 | tree typelist, values, name, fundecl; | |
400fbf9f JW |
1647 | { |
1648 | register tree typetail, valtail; | |
1649 | register tree result = NULL; | |
1650 | int parmnum; | |
1651 | ||
1652 | /* Scan the given expressions and types, producing individual | |
1653 | converted arguments and pushing them on RESULT in reverse order. */ | |
1654 | ||
1655 | for (valtail = values, typetail = typelist, parmnum = 0; | |
1656 | valtail; | |
1657 | valtail = TREE_CHAIN (valtail), parmnum++) | |
1658 | { | |
1659 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
1660 | register tree val = TREE_VALUE (valtail); | |
1661 | ||
1662 | if (type == void_type_node) | |
1663 | { | |
1664 | if (name) | |
1665 | error ("too many arguments to function `%s'", | |
1666 | IDENTIFIER_POINTER (name)); | |
1667 | else | |
1668 | error ("too many arguments to function"); | |
1669 | break; | |
1670 | } | |
1671 | ||
1672 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
1673 | /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0 |
1674 | to convert automatically to a pointer. */ | |
400fbf9f JW |
1675 | if (TREE_CODE (val) == NON_LVALUE_EXPR) |
1676 | val = TREE_OPERAND (val, 0); | |
1677 | ||
1678 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
1679 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE) | |
1680 | val = default_conversion (val); | |
1681 | ||
1682 | val = require_complete_type (val); | |
1683 | ||
1684 | if (type != 0) | |
1685 | { | |
1686 | /* Formal parm type is specified by a function prototype. */ | |
1687 | tree parmval; | |
1688 | ||
1689 | if (TYPE_SIZE (type) == 0) | |
1690 | { | |
1691 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
1692 | parmval = val; | |
1693 | } | |
1694 | else | |
1695 | { | |
d45cf215 RS |
1696 | /* Optionally warn about conversions that |
1697 | differ from the default conversions. */ | |
400fbf9f JW |
1698 | if (warn_conversion) |
1699 | { | |
1700 | int formal_prec = TYPE_PRECISION (type); | |
400fbf9f | 1701 | |
aae43c5f | 1702 | if (INTEGRAL_TYPE_P (type) |
400fbf9f | 1703 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) |
754a4d82 | 1704 | warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1); |
aae43c5f RK |
1705 | else if (TREE_CODE (type) == COMPLEX_TYPE |
1706 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
1707 | warn_for_assignment ("%s as complex rather than floating due to prototype", (char *) 0, name, parmnum + 1); | |
400fbf9f | 1708 | else if (TREE_CODE (type) == REAL_TYPE |
aae43c5f | 1709 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) |
754a4d82 | 1710 | warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1); |
aae43c5f RK |
1711 | else if (TREE_CODE (type) == REAL_TYPE |
1712 | && TREE_CODE (TREE_TYPE (val)) == COMPLEX_TYPE) | |
1713 | warn_for_assignment ("%s as floating rather than complex due to prototype", (char *) 0, name, parmnum + 1); | |
1714 | /* ??? At some point, messages should be written about | |
1715 | conversions between complex types, but that's too messy | |
1716 | to do now. */ | |
d45cf215 RS |
1717 | else if (TREE_CODE (type) == REAL_TYPE |
1718 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
1719 | { | |
1720 | /* Warn if any argument is passed as `float', | |
047de90b | 1721 | since without a prototype it would be `double'. */ |
d45cf215 | 1722 | if (formal_prec == TYPE_PRECISION (float_type_node)) |
754a4d82 | 1723 | warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 | 1724 | } |
400fbf9f | 1725 | /* Detect integer changing in width or signedness. */ |
aae43c5f RK |
1726 | else if (INTEGRAL_TYPE_P (type) |
1727 | && INTEGRAL_TYPE_P (TREE_TYPE (val))) | |
400fbf9f | 1728 | { |
d45cf215 RS |
1729 | tree would_have_been = default_conversion (val); |
1730 | tree type1 = TREE_TYPE (would_have_been); | |
1731 | ||
754a4d82 RS |
1732 | if (TREE_CODE (type) == ENUMERAL_TYPE |
1733 | && type == TREE_TYPE (val)) | |
1734 | /* No warning if function asks for enum | |
1735 | and the actual arg is that enum type. */ | |
1736 | ; | |
1737 | else if (formal_prec != TYPE_PRECISION (type1)) | |
1738 | warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1); | |
d45cf215 RS |
1739 | else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1)) |
1740 | ; | |
800cd3b9 RS |
1741 | /* Don't complain if the formal parameter type |
1742 | is an enum, because we can't tell now whether | |
1743 | the value was an enum--even the same enum. */ | |
1744 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
1745 | ; | |
400fbf9f JW |
1746 | else if (TREE_CODE (val) == INTEGER_CST |
1747 | && int_fits_type_p (val, type)) | |
1748 | /* Change in signedness doesn't matter | |
1749 | if a constant value is unaffected. */ | |
1750 | ; | |
4bbbc5d9 RS |
1751 | /* Likewise for a constant in a NOP_EXPR. */ |
1752 | else if (TREE_CODE (val) == NOP_EXPR | |
1753 | && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST | |
1754 | && int_fits_type_p (TREE_OPERAND (val, 0), type)) | |
1755 | ; | |
1756 | #if 0 /* We never get such tree structure here. */ | |
047de90b RS |
1757 | else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE |
1758 | && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type) | |
1759 | && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type)) | |
1760 | /* Change in signedness doesn't matter | |
1761 | if an enum value is unaffected. */ | |
1762 | ; | |
4bbbc5d9 | 1763 | #endif |
ce9895ae RS |
1764 | /* If the value is extended from a narrower |
1765 | unsigned type, it doesn't matter whether we | |
1766 | pass it as signed or unsigned; the value | |
1767 | certainly is the same either way. */ | |
1768 | else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type) | |
1769 | && TREE_UNSIGNED (TREE_TYPE (val))) | |
1770 | ; | |
400fbf9f | 1771 | else if (TREE_UNSIGNED (type)) |
754a4d82 | 1772 | warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f | 1773 | else |
754a4d82 | 1774 | warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f JW |
1775 | } |
1776 | } | |
1777 | ||
1778 | parmval = convert_for_assignment (type, val, | |
0f41302f | 1779 | (char *) 0, /* arg passing */ |
9b7267b8 | 1780 | fundecl, name, parmnum + 1); |
400fbf9f JW |
1781 | |
1782 | #ifdef PROMOTE_PROTOTYPES | |
7fb90b98 RK |
1783 | if ((TREE_CODE (type) == INTEGER_TYPE |
1784 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
400fbf9f JW |
1785 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) |
1786 | parmval = default_conversion (parmval); | |
1787 | #endif | |
1788 | } | |
8d9bfdc5 | 1789 | result = tree_cons (NULL_TREE, parmval, result); |
400fbf9f JW |
1790 | } |
1791 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
1792 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
1793 | < TYPE_PRECISION (double_type_node))) | |
1794 | /* Convert `float' to `double'. */ | |
1795 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
1796 | else | |
1797 | /* Convert `short' and `char' to full-size `int'. */ | |
1798 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
1799 | ||
1800 | if (typetail) | |
1801 | typetail = TREE_CHAIN (typetail); | |
1802 | } | |
1803 | ||
1804 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) | |
1805 | { | |
1806 | if (name) | |
1807 | error ("too few arguments to function `%s'", | |
1808 | IDENTIFIER_POINTER (name)); | |
1809 | else | |
1810 | error ("too few arguments to function"); | |
1811 | } | |
1812 | ||
1813 | return nreverse (result); | |
1814 | } | |
1815 | \f | |
1816 | /* This is the entry point used by the parser | |
1817 | for binary operators in the input. | |
1818 | In addition to constructing the expression, | |
1819 | we check for operands that were written with other binary operators | |
1820 | in a way that is likely to confuse the user. */ | |
edc7c4ec | 1821 | |
400fbf9f JW |
1822 | tree |
1823 | parser_build_binary_op (code, arg1, arg2) | |
1824 | enum tree_code code; | |
1825 | tree arg1, arg2; | |
1826 | { | |
1827 | tree result = build_binary_op (code, arg1, arg2, 1); | |
1828 | ||
1829 | char class; | |
1830 | char class1 = TREE_CODE_CLASS (TREE_CODE (arg1)); | |
1831 | char class2 = TREE_CODE_CLASS (TREE_CODE (arg2)); | |
1832 | enum tree_code code1 = ERROR_MARK; | |
1833 | enum tree_code code2 = ERROR_MARK; | |
1834 | ||
1835 | if (class1 == 'e' || class1 == '1' | |
1836 | || class1 == '2' || class1 == '<') | |
1837 | code1 = C_EXP_ORIGINAL_CODE (arg1); | |
1838 | if (class2 == 'e' || class2 == '1' | |
1839 | || class2 == '2' || class2 == '<') | |
1840 | code2 = C_EXP_ORIGINAL_CODE (arg2); | |
1841 | ||
1842 | /* Check for cases such as x+y<<z which users are likely | |
1843 | to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE | |
1844 | is cleared to prevent these warnings. */ | |
1845 | if (warn_parentheses) | |
1846 | { | |
1847 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
1848 | { | |
1849 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1850 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1851 | warning ("suggest parentheses around + or - inside shift"); | |
1852 | } | |
1853 | ||
1854 | if (code == TRUTH_ORIF_EXPR) | |
1855 | { | |
1856 | if (code1 == TRUTH_ANDIF_EXPR | |
1857 | || code2 == TRUTH_ANDIF_EXPR) | |
1858 | warning ("suggest parentheses around && within ||"); | |
1859 | } | |
1860 | ||
1861 | if (code == BIT_IOR_EXPR) | |
1862 | { | |
1863 | if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR | |
1864 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1865 | || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR | |
1866 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1867 | warning ("suggest parentheses around arithmetic in operand of |"); | |
7e9d002a RK |
1868 | /* Check cases like x|y==z */ |
1869 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1870 | warning ("suggest parentheses around comparison in operand of |"); | |
400fbf9f JW |
1871 | } |
1872 | ||
1873 | if (code == BIT_XOR_EXPR) | |
1874 | { | |
1875 | if (code1 == BIT_AND_EXPR | |
1876 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1877 | || code2 == BIT_AND_EXPR | |
1878 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1879 | warning ("suggest parentheses around arithmetic in operand of ^"); | |
7e9d002a RK |
1880 | /* Check cases like x^y==z */ |
1881 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1882 | warning ("suggest parentheses around comparison in operand of ^"); | |
400fbf9f JW |
1883 | } |
1884 | ||
1885 | if (code == BIT_AND_EXPR) | |
1886 | { | |
1887 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
1888 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
1889 | warning ("suggest parentheses around + or - in operand of &"); | |
7e9d002a RK |
1890 | /* Check cases like x&y==z */ |
1891 | if (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<') | |
1892 | warning ("suggest parentheses around comparison in operand of &"); | |
400fbf9f JW |
1893 | } |
1894 | } | |
1895 | ||
001af587 | 1896 | /* Similarly, check for cases like 1<=i<=10 that are probably errors. */ |
edc7c4ec | 1897 | if (TREE_CODE_CLASS (code) == '<' && extra_warnings |
001af587 RS |
1898 | && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')) |
1899 | warning ("comparisons like X<=Y<=Z do not have their mathematical meaning"); | |
1900 | ||
e58cd767 RS |
1901 | unsigned_conversion_warning (result, arg1); |
1902 | unsigned_conversion_warning (result, arg2); | |
1903 | overflow_warning (result); | |
1904 | ||
edc7c4ec RS |
1905 | class = TREE_CODE_CLASS (TREE_CODE (result)); |
1906 | ||
400fbf9f JW |
1907 | /* Record the code that was specified in the source, |
1908 | for the sake of warnings about confusing nesting. */ | |
1909 | if (class == 'e' || class == '1' | |
1910 | || class == '2' || class == '<') | |
1911 | C_SET_EXP_ORIGINAL_CODE (result, code); | |
1912 | else | |
1913 | { | |
1914 | int flag = TREE_CONSTANT (result); | |
d11fdb45 RS |
1915 | /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR |
1916 | so that convert_for_assignment wouldn't strip it. | |
1917 | That way, we got warnings for things like p = (1 - 1). | |
1918 | But it turns out we should not get those warnings. */ | |
1919 | result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result); | |
400fbf9f JW |
1920 | C_SET_EXP_ORIGINAL_CODE (result, code); |
1921 | TREE_CONSTANT (result) = flag; | |
1922 | } | |
1923 | ||
1924 | return result; | |
1925 | } | |
1926 | ||
1927 | /* Build a binary-operation expression without default conversions. | |
1928 | CODE is the kind of expression to build. | |
1929 | This function differs from `build' in several ways: | |
1930 | the data type of the result is computed and recorded in it, | |
1931 | warnings are generated if arg data types are invalid, | |
1932 | special handling for addition and subtraction of pointers is known, | |
1933 | and some optimization is done (operations on narrow ints | |
1934 | are done in the narrower type when that gives the same result). | |
1935 | Constant folding is also done before the result is returned. | |
1936 | ||
1937 | Note that the operands will never have enumeral types, or function | |
1938 | or array types, because either they will have the default conversions | |
1939 | performed or they have both just been converted to some other type in which | |
1940 | the arithmetic is to be done. */ | |
1941 | ||
1942 | tree | |
1943 | build_binary_op (code, orig_op0, orig_op1, convert_p) | |
1944 | enum tree_code code; | |
1945 | tree orig_op0, orig_op1; | |
1946 | int convert_p; | |
1947 | { | |
1948 | tree type0, type1; | |
1949 | register enum tree_code code0, code1; | |
1950 | tree op0, op1; | |
1951 | ||
1952 | /* Expression code to give to the expression when it is built. | |
1953 | Normally this is CODE, which is what the caller asked for, | |
1954 | but in some special cases we change it. */ | |
1955 | register enum tree_code resultcode = code; | |
1956 | ||
1957 | /* Data type in which the computation is to be performed. | |
1958 | In the simplest cases this is the common type of the arguments. */ | |
1959 | register tree result_type = NULL; | |
1960 | ||
1961 | /* Nonzero means operands have already been type-converted | |
1962 | in whatever way is necessary. | |
1963 | Zero means they need to be converted to RESULT_TYPE. */ | |
1964 | int converted = 0; | |
1965 | ||
293c9fdd JM |
1966 | /* Nonzero means create the expression with this type, rather than |
1967 | RESULT_TYPE. */ | |
1968 | tree build_type = 0; | |
1969 | ||
400fbf9f | 1970 | /* Nonzero means after finally constructing the expression |
293c9fdd | 1971 | convert it to this type. */ |
400fbf9f JW |
1972 | tree final_type = 0; |
1973 | ||
1974 | /* Nonzero if this is an operation like MIN or MAX which can | |
1975 | safely be computed in short if both args are promoted shorts. | |
1976 | Also implies COMMON. | |
1977 | -1 indicates a bitwise operation; this makes a difference | |
1978 | in the exact conditions for when it is safe to do the operation | |
1979 | in a narrower mode. */ | |
1980 | int shorten = 0; | |
1981 | ||
1982 | /* Nonzero if this is a comparison operation; | |
1983 | if both args are promoted shorts, compare the original shorts. | |
1984 | Also implies COMMON. */ | |
1985 | int short_compare = 0; | |
1986 | ||
1987 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
1988 | original short and then promoted if the operand is a promoted short. */ | |
1989 | int short_shift = 0; | |
1990 | ||
1991 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
1992 | int common = 0; | |
1993 | ||
1994 | if (convert_p) | |
1995 | { | |
1996 | op0 = default_conversion (orig_op0); | |
1997 | op1 = default_conversion (orig_op1); | |
1998 | } | |
1999 | else | |
2000 | { | |
2001 | op0 = orig_op0; | |
2002 | op1 = orig_op1; | |
2003 | } | |
2004 | ||
2005 | type0 = TREE_TYPE (op0); | |
2006 | type1 = TREE_TYPE (op1); | |
2007 | ||
2008 | /* The expression codes of the data types of the arguments tell us | |
2009 | whether the arguments are integers, floating, pointers, etc. */ | |
2010 | code0 = TREE_CODE (type0); | |
2011 | code1 = TREE_CODE (type1); | |
2012 | ||
fc76e425 | 2013 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce RS |
2014 | STRIP_TYPE_NOPS (op0); |
2015 | STRIP_TYPE_NOPS (op1); | |
400fbf9f JW |
2016 | |
2017 | /* If an error was already reported for one of the arguments, | |
2018 | avoid reporting another error. */ | |
2019 | ||
2020 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
2021 | return error_mark_node; | |
2022 | ||
2023 | switch (code) | |
2024 | { | |
2025 | case PLUS_EXPR: | |
2026 | /* Handle the pointer + int case. */ | |
2027 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2028 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
2029 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
2030 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
2031 | else | |
2032 | common = 1; | |
2033 | break; | |
2034 | ||
2035 | case MINUS_EXPR: | |
2036 | /* Subtraction of two similar pointers. | |
2037 | We must subtract them as integers, then divide by object size. */ | |
2038 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
2039 | && comp_target_types (type0, type1)) | |
2040 | return pointer_diff (op0, op1); | |
2041 | /* Handle pointer minus int. Just like pointer plus int. */ | |
2042 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2043 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
2044 | else | |
2045 | common = 1; | |
2046 | break; | |
2047 | ||
2048 | case MULT_EXPR: | |
2049 | common = 1; | |
2050 | break; | |
2051 | ||
2052 | case TRUNC_DIV_EXPR: | |
2053 | case CEIL_DIV_EXPR: | |
2054 | case FLOOR_DIV_EXPR: | |
2055 | case ROUND_DIV_EXPR: | |
2056 | case EXACT_DIV_EXPR: | |
b6a10c9f RS |
2057 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2058 | || code0 == COMPLEX_TYPE) | |
2059 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2060 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2061 | { |
2062 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) | |
2063 | resultcode = RDIV_EXPR; | |
2064 | else | |
8b39ed65 TG |
2065 | { |
2066 | /* Although it would be tempting to shorten always here, that | |
2067 | loses on some targets, since the modulo instruction is | |
2068 | undefined if the quotient can't be represented in the | |
2069 | computation mode. We shorten only if unsigned or if | |
2070 | dividing by something we know != -1. */ | |
96d8f1d8 | 2071 | shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0)) |
8b39ed65 TG |
2072 | || (TREE_CODE (op1) == INTEGER_CST |
2073 | && (TREE_INT_CST_LOW (op1) != -1 | |
2074 | || TREE_INT_CST_HIGH (op1) != -1))); | |
2075 | } | |
400fbf9f JW |
2076 | common = 1; |
2077 | } | |
2078 | break; | |
2079 | ||
2080 | case BIT_AND_EXPR: | |
2081 | case BIT_ANDTC_EXPR: | |
2082 | case BIT_IOR_EXPR: | |
2083 | case BIT_XOR_EXPR: | |
2084 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2085 | shorten = -1; | |
2086 | /* If one operand is a constant, and the other is a short type | |
2087 | that has been converted to an int, | |
2088 | really do the work in the short type and then convert the | |
2089 | result to int. If we are lucky, the constant will be 0 or 1 | |
2090 | in the short type, making the entire operation go away. */ | |
2091 | if (TREE_CODE (op0) == INTEGER_CST | |
2092 | && TREE_CODE (op1) == NOP_EXPR | |
2093 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
2094 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
2095 | { | |
2096 | final_type = result_type; | |
2097 | op1 = TREE_OPERAND (op1, 0); | |
2098 | result_type = TREE_TYPE (op1); | |
2099 | } | |
2100 | if (TREE_CODE (op1) == INTEGER_CST | |
2101 | && TREE_CODE (op0) == NOP_EXPR | |
2102 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
2103 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
2104 | { | |
2105 | final_type = result_type; | |
2106 | op0 = TREE_OPERAND (op0, 0); | |
2107 | result_type = TREE_TYPE (op0); | |
2108 | } | |
2109 | break; | |
2110 | ||
2111 | case TRUNC_MOD_EXPR: | |
047de90b | 2112 | case FLOOR_MOD_EXPR: |
400fbf9f | 2113 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
03d5b1f5 RS |
2114 | { |
2115 | /* Although it would be tempting to shorten always here, that loses | |
2116 | on some targets, since the modulo instruction is undefined if the | |
2117 | quotient can't be represented in the computation mode. We shorten | |
2118 | only if unsigned or if dividing by something we know != -1. */ | |
96d8f1d8 | 2119 | shorten = (TREE_UNSIGNED (TREE_TYPE (orig_op0)) |
03d5b1f5 RS |
2120 | || (TREE_CODE (op1) == INTEGER_CST |
2121 | && (TREE_INT_CST_LOW (op1) != -1 | |
2122 | || TREE_INT_CST_HIGH (op1) != -1))); | |
2123 | common = 1; | |
2124 | } | |
400fbf9f JW |
2125 | break; |
2126 | ||
2127 | case TRUTH_ANDIF_EXPR: | |
2128 | case TRUTH_ORIF_EXPR: | |
2129 | case TRUTH_AND_EXPR: | |
2130 | case TRUTH_OR_EXPR: | |
1eca8b1e | 2131 | case TRUTH_XOR_EXPR: |
b6a10c9f RS |
2132 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE |
2133 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) | |
2134 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE | |
2135 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2136 | { |
2137 | /* Result of these operations is always an int, | |
2138 | but that does not mean the operands should be | |
2139 | converted to ints! */ | |
2140 | result_type = integer_type_node; | |
2141 | op0 = truthvalue_conversion (op0); | |
2142 | op1 = truthvalue_conversion (op1); | |
2143 | converted = 1; | |
2144 | } | |
2145 | break; | |
2146 | ||
2147 | /* Shift operations: result has same type as first operand; | |
2148 | always convert second operand to int. | |
2149 | Also set SHORT_SHIFT if shifting rightward. */ | |
2150 | ||
2151 | case RSHIFT_EXPR: | |
2152 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2153 | { | |
47ee6837 | 2154 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
400fbf9f | 2155 | { |
ff3225e7 | 2156 | if (tree_int_cst_sgn (op1) < 0) |
315da535 | 2157 | warning ("right shift count is negative"); |
17651386 RS |
2158 | else |
2159 | { | |
2160 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
2161 | short_shift = 1; | |
2162 | if (TREE_INT_CST_HIGH (op1) != 0 | |
2163 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2164 | >= TYPE_PRECISION (type0))) | |
315da535 | 2165 | warning ("right shift count >= width of type"); |
17651386 | 2166 | } |
400fbf9f | 2167 | } |
d45cf215 RS |
2168 | /* Use the type of the value to be shifted. |
2169 | This is what most traditional C compilers do. */ | |
2170 | result_type = type0; | |
400fbf9f JW |
2171 | /* Unless traditional, convert the shift-count to an integer, |
2172 | regardless of size of value being shifted. */ | |
2173 | if (! flag_traditional) | |
2174 | { | |
6cb72a7d | 2175 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2176 | op1 = convert (integer_type_node, op1); |
2177 | /* Avoid converting op1 to result_type later. */ | |
2178 | converted = 1; | |
2179 | } | |
400fbf9f JW |
2180 | } |
2181 | break; | |
2182 | ||
2183 | case LSHIFT_EXPR: | |
2184 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2185 | { | |
47ee6837 | 2186 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
17651386 | 2187 | { |
ff3225e7 | 2188 | if (tree_int_cst_sgn (op1) < 0) |
315da535 | 2189 | warning ("left shift count is negative"); |
17651386 RS |
2190 | else if (TREE_INT_CST_HIGH (op1) != 0 |
2191 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2192 | >= TYPE_PRECISION (type0))) | |
315da535 | 2193 | warning ("left shift count >= width of type"); |
17651386 | 2194 | } |
d45cf215 RS |
2195 | /* Use the type of the value to be shifted. |
2196 | This is what most traditional C compilers do. */ | |
2197 | result_type = type0; | |
400fbf9f JW |
2198 | /* Unless traditional, convert the shift-count to an integer, |
2199 | regardless of size of value being shifted. */ | |
2200 | if (! flag_traditional) | |
2201 | { | |
6cb72a7d | 2202 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2203 | op1 = convert (integer_type_node, op1); |
2204 | /* Avoid converting op1 to result_type later. */ | |
2205 | converted = 1; | |
2206 | } | |
400fbf9f JW |
2207 | } |
2208 | break; | |
2209 | ||
2210 | case RROTATE_EXPR: | |
2211 | case LROTATE_EXPR: | |
2212 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2213 | { | |
47ee6837 | 2214 | if (TREE_CODE (op1) == INTEGER_CST && skip_evaluation == 0) |
17651386 | 2215 | { |
ff3225e7 | 2216 | if (tree_int_cst_sgn (op1) < 0) |
17651386 RS |
2217 | warning ("shift count is negative"); |
2218 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
2219 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2220 | >= TYPE_PRECISION (type0))) | |
2221 | warning ("shift count >= width of type"); | |
2222 | } | |
d45cf215 RS |
2223 | /* Use the type of the value to be shifted. |
2224 | This is what most traditional C compilers do. */ | |
2225 | result_type = type0; | |
400fbf9f JW |
2226 | /* Unless traditional, convert the shift-count to an integer, |
2227 | regardless of size of value being shifted. */ | |
2228 | if (! flag_traditional) | |
2229 | { | |
6cb72a7d | 2230 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2231 | op1 = convert (integer_type_node, op1); |
2232 | /* Avoid converting op1 to result_type later. */ | |
2233 | converted = 1; | |
2234 | } | |
400fbf9f JW |
2235 | } |
2236 | break; | |
2237 | ||
2238 | case EQ_EXPR: | |
2239 | case NE_EXPR: | |
2240 | /* Result of comparison is always int, | |
2241 | but don't convert the args to int! */ | |
293c9fdd | 2242 | build_type = integer_type_node; |
b6a10c9f RS |
2243 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2244 | || code0 == COMPLEX_TYPE) | |
2245 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2246 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2247 | short_compare = 1; |
2248 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2249 | { | |
2250 | register tree tt0 = TREE_TYPE (type0); | |
2251 | register tree tt1 = TREE_TYPE (type1); | |
2252 | /* Anything compares with void *. void * compares with anything. | |
d11fdb45 RS |
2253 | Otherwise, the targets must be compatible |
2254 | and both must be object or both incomplete. */ | |
400fbf9f | 2255 | if (comp_target_types (type0, type1)) |
605a99f6 | 2256 | result_type = common_type (type0, type1); |
400fbf9f JW |
2257 | else if (TYPE_MAIN_VARIANT (tt0) == void_type_node) |
2258 | { | |
fd5d5b94 RS |
2259 | /* op0 != orig_op0 detects the case of something |
2260 | whose value is 0 but which isn't a valid null ptr const. */ | |
2261 | if (pedantic && (!integer_zerop (op0) || op0 != orig_op0) | |
400fbf9f JW |
2262 | && TREE_CODE (tt1) == FUNCTION_TYPE) |
2263 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2264 | } | |
2265 | else if (TYPE_MAIN_VARIANT (tt1) == void_type_node) | |
2266 | { | |
fd5d5b94 | 2267 | if (pedantic && (!integer_zerop (op1) || op1 != orig_op1) |
400fbf9f JW |
2268 | && TREE_CODE (tt0) == FUNCTION_TYPE) |
2269 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2270 | } | |
2271 | else | |
2272 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
605a99f6 JM |
2273 | |
2274 | if (result_type == NULL_TREE) | |
2275 | result_type = ptr_type_node; | |
400fbf9f JW |
2276 | } |
2277 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2278 | && integer_zerop (op1)) | |
293c9fdd | 2279 | result_type = type0; |
400fbf9f JW |
2280 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
2281 | && integer_zerop (op0)) | |
293c9fdd | 2282 | result_type = type1; |
400fbf9f JW |
2283 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
2284 | { | |
293c9fdd | 2285 | result_type = type0; |
400fbf9f JW |
2286 | if (! flag_traditional) |
2287 | pedwarn ("comparison between pointer and integer"); | |
400fbf9f JW |
2288 | } |
2289 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2290 | { | |
293c9fdd | 2291 | result_type = type1; |
400fbf9f JW |
2292 | if (! flag_traditional) |
2293 | pedwarn ("comparison between pointer and integer"); | |
400fbf9f | 2294 | } |
400fbf9f JW |
2295 | break; |
2296 | ||
2297 | case MAX_EXPR: | |
2298 | case MIN_EXPR: | |
9db931af RS |
2299 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
2300 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
400fbf9f JW |
2301 | shorten = 1; |
2302 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2303 | { | |
605a99f6 JM |
2304 | if (comp_target_types (type0, type1)) |
2305 | { | |
2306 | result_type = common_type (type0, type1); | |
2307 | if (pedantic | |
2308 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2309 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2310 | } | |
2311 | else | |
2312 | { | |
2313 | result_type = ptr_type_node; | |
2314 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2315 | } | |
400fbf9f JW |
2316 | } |
2317 | break; | |
2318 | ||
2319 | case LE_EXPR: | |
2320 | case GE_EXPR: | |
2321 | case LT_EXPR: | |
2322 | case GT_EXPR: | |
293c9fdd | 2323 | build_type = integer_type_node; |
9db931af RS |
2324 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
2325 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
400fbf9f JW |
2326 | short_compare = 1; |
2327 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2328 | { | |
605a99f6 JM |
2329 | if (comp_target_types (type0, type1)) |
2330 | { | |
2331 | result_type = common_type (type0, type1); | |
2332 | if ((TYPE_SIZE (TREE_TYPE (type0)) != 0) | |
2333 | != (TYPE_SIZE (TREE_TYPE (type1)) != 0)) | |
2334 | pedwarn ("comparison of complete and incomplete pointers"); | |
2335 | else if (pedantic | |
2336 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2337 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2338 | } | |
2339 | else | |
2340 | { | |
2341 | result_type = ptr_type_node; | |
2342 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2343 | } | |
400fbf9f JW |
2344 | } |
2345 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2346 | && integer_zerop (op1)) | |
2347 | { | |
293c9fdd | 2348 | result_type = type0; |
ddcf4abc | 2349 | if (pedantic || extra_warnings) |
400fbf9f JW |
2350 | pedwarn ("ordered comparison of pointer with integer zero"); |
2351 | } | |
2352 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2353 | && integer_zerop (op0)) | |
2354 | { | |
293c9fdd | 2355 | result_type = type1; |
400fbf9f JW |
2356 | if (pedantic) |
2357 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2358 | } | |
2359 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2360 | { | |
293c9fdd | 2361 | result_type = type0; |
400fbf9f JW |
2362 | if (! flag_traditional) |
2363 | pedwarn ("comparison between pointer and integer"); | |
400fbf9f JW |
2364 | } |
2365 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2366 | { | |
293c9fdd | 2367 | result_type = type1; |
400fbf9f JW |
2368 | if (! flag_traditional) |
2369 | pedwarn ("comparison between pointer and integer"); | |
400fbf9f | 2370 | } |
400fbf9f | 2371 | break; |
e9a25f70 JL |
2372 | |
2373 | default: | |
2374 | break; | |
400fbf9f JW |
2375 | } |
2376 | ||
b6a10c9f RS |
2377 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) |
2378 | && | |
2379 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f | 2380 | { |
b6a10c9f RS |
2381 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
2382 | ||
400fbf9f JW |
2383 | if (shorten || common || short_compare) |
2384 | result_type = common_type (type0, type1); | |
2385 | ||
2386 | /* For certain operations (which identify themselves by shorten != 0) | |
2387 | if both args were extended from the same smaller type, | |
2388 | do the arithmetic in that type and then extend. | |
2389 | ||
2390 | shorten !=0 and !=1 indicates a bitwise operation. | |
2391 | For them, this optimization is safe only if | |
2392 | both args are zero-extended or both are sign-extended. | |
2393 | Otherwise, we might change the result. | |
2394 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
2395 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
2396 | ||
b6a10c9f | 2397 | if (shorten && none_complex) |
400fbf9f JW |
2398 | { |
2399 | int unsigned0, unsigned1; | |
2400 | tree arg0 = get_narrower (op0, &unsigned0); | |
2401 | tree arg1 = get_narrower (op1, &unsigned1); | |
2402 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
2403 | int uns = TREE_UNSIGNED (result_type); | |
2404 | tree type; | |
2405 | ||
2406 | final_type = result_type; | |
2407 | ||
e7951b3f | 2408 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
400fbf9f JW |
2409 | but it *requires* conversion to FINAL_TYPE. */ |
2410 | ||
e7951b3f RS |
2411 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
2412 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2413 | && TREE_TYPE (op0) != final_type) | |
400fbf9f | 2414 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); |
e7951b3f RS |
2415 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
2416 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
2417 | && TREE_TYPE (op1) != final_type) | |
400fbf9f JW |
2418 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); |
2419 | ||
2420 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
2421 | ||
2422 | /* For bitwise operations, signedness of nominal type | |
2423 | does not matter. Consider only how operands were extended. */ | |
2424 | if (shorten == -1) | |
2425 | uns = unsigned0; | |
2426 | ||
2427 | /* Note that in all three cases below we refrain from optimizing | |
2428 | an unsigned operation on sign-extended args. | |
2429 | That would not be valid. */ | |
2430 | ||
2431 | /* Both args variable: if both extended in same way | |
2432 | from same width, do it in that width. | |
2433 | Do it unsigned if args were zero-extended. */ | |
2434 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
2435 | < TYPE_PRECISION (result_type)) | |
2436 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2437 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2438 | && unsigned0 == unsigned1 | |
2439 | && (unsigned0 || !uns)) | |
2440 | result_type | |
2441 | = signed_or_unsigned_type (unsigned0, | |
2442 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
2443 | else if (TREE_CODE (arg0) == INTEGER_CST | |
2444 | && (unsigned1 || !uns) | |
2445 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2446 | < TYPE_PRECISION (result_type)) | |
2447 | && (type = signed_or_unsigned_type (unsigned1, | |
2448 | TREE_TYPE (arg1)), | |
2449 | int_fits_type_p (arg0, type))) | |
2450 | result_type = type; | |
2451 | else if (TREE_CODE (arg1) == INTEGER_CST | |
2452 | && (unsigned0 || !uns) | |
2453 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
2454 | < TYPE_PRECISION (result_type)) | |
2455 | && (type = signed_or_unsigned_type (unsigned0, | |
2456 | TREE_TYPE (arg0)), | |
2457 | int_fits_type_p (arg1, type))) | |
2458 | result_type = type; | |
2459 | } | |
2460 | ||
2461 | /* Shifts can be shortened if shifting right. */ | |
2462 | ||
2463 | if (short_shift) | |
2464 | { | |
2465 | int unsigned_arg; | |
2466 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
2467 | ||
2468 | final_type = result_type; | |
2469 | ||
2470 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
2471 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
2472 | ||
2473 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
6cb70f0c JW |
2474 | /* We can shorten only if the shift count is less than the |
2475 | number of bits in the smaller type size. */ | |
2476 | && TREE_INT_CST_HIGH (op1) == 0 | |
2477 | && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1) | |
400fbf9f JW |
2478 | /* If arg is sign-extended and then unsigned-shifted, |
2479 | we can simulate this with a signed shift in arg's type | |
2480 | only if the extended result is at least twice as wide | |
2481 | as the arg. Otherwise, the shift could use up all the | |
2482 | ones made by sign-extension and bring in zeros. | |
2483 | We can't optimize that case at all, but in most machines | |
2484 | it never happens because available widths are 2**N. */ | |
2485 | && (!TREE_UNSIGNED (final_type) | |
2486 | || unsigned_arg | |
2487 | || 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type))) | |
2488 | { | |
2489 | /* Do an unsigned shift if the operand was zero-extended. */ | |
2490 | result_type | |
2491 | = signed_or_unsigned_type (unsigned_arg, | |
2492 | TREE_TYPE (arg0)); | |
2493 | /* Convert value-to-be-shifted to that type. */ | |
2494 | if (TREE_TYPE (op0) != result_type) | |
2495 | op0 = convert (result_type, op0); | |
2496 | converted = 1; | |
2497 | } | |
2498 | } | |
2499 | ||
2500 | /* Comparison operations are shortened too but differently. | |
2501 | They identify themselves by setting short_compare = 1. */ | |
2502 | ||
75326e8c | 2503 | if (short_compare) |
400fbf9f JW |
2504 | { |
2505 | /* Don't write &op0, etc., because that would prevent op0 | |
2506 | from being kept in a register. | |
2507 | Instead, make copies of the our local variables and | |
2508 | pass the copies by reference, then copy them back afterward. */ | |
2509 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
2510 | enum tree_code xresultcode = resultcode; | |
2511 | tree val | |
2512 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
2513 | if (val != 0) | |
2514 | return val; | |
293c9fdd JM |
2515 | op0 = xop0, op1 = xop1; |
2516 | converted = 1; | |
400fbf9f JW |
2517 | resultcode = xresultcode; |
2518 | ||
407cb092 PE |
2519 | if ((warn_sign_compare < 0 ? extra_warnings : warn_sign_compare != 0) |
2520 | && skip_evaluation == 0) | |
400fbf9f | 2521 | { |
d2d7ed3e JM |
2522 | int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); |
2523 | int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
2524 | ||
64c01f80 DE |
2525 | int unsignedp0, unsignedp1; |
2526 | tree primop0 = get_narrower (op0, &unsignedp0); | |
2527 | tree primop1 = get_narrower (op1, &unsignedp1); | |
2528 | ||
912b4fc3 JM |
2529 | /* Avoid spurious warnings for comparison with enumerators. */ |
2530 | ||
2531 | xop0 = orig_op0; | |
2532 | xop1 = orig_op1; | |
2533 | STRIP_TYPE_NOPS (xop0); | |
2534 | STRIP_TYPE_NOPS (xop1); | |
2535 | ||
400fbf9f | 2536 | /* Give warnings for comparisons between signed and unsigned |
293c9fdd | 2537 | quantities that may fail. */ |
400fbf9f JW |
2538 | /* Do the checking based on the original operand trees, so that |
2539 | casts will be considered, but default promotions won't be. */ | |
293c9fdd JM |
2540 | |
2541 | /* Do not warn if the comparison is being done in a signed type, | |
2542 | since the signed type will only be chosen if it can represent | |
2543 | all the values of the unsigned type. */ | |
2544 | if (! TREE_UNSIGNED (result_type)) | |
2545 | /* OK */; | |
2e14370e JM |
2546 | /* Do not warn if both operands are unsigned. */ |
2547 | else if (op0_signed == op1_signed) | |
2548 | /* OK */; | |
293c9fdd JM |
2549 | /* Do not warn if the signed quantity is an unsuffixed |
2550 | integer literal (or some static constant expression | |
2551 | involving such literals) and it is non-negative. */ | |
2552 | else if ((op0_signed && TREE_CODE (xop0) == INTEGER_CST | |
2553 | && tree_int_cst_sgn (xop0) >= 0) | |
2554 | || (op1_signed && TREE_CODE (xop1) == INTEGER_CST | |
2555 | && tree_int_cst_sgn (xop1) >= 0)) | |
2556 | /* OK */; | |
2557 | /* Do not warn if the comparison is an equality operation, | |
2558 | the unsigned quantity is an integral constant and it does | |
2559 | not use the most significant bit of result_type. */ | |
2560 | else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
2561 | && ((op0_signed && TREE_CODE (xop1) == INTEGER_CST | |
9f6de2b9 | 2562 | && int_fits_type_p (xop1, signed_type (result_type))) |
293c9fdd | 2563 | || (op1_signed && TREE_CODE (xop0) == INTEGER_CST |
9f6de2b9 | 2564 | && int_fits_type_p (xop0, signed_type (result_type))))) |
293c9fdd JM |
2565 | /* OK */; |
2566 | else | |
400fbf9f | 2567 | warning ("comparison between signed and unsigned"); |
64c01f80 DE |
2568 | |
2569 | /* Warn if two unsigned values are being compared in a size | |
2570 | larger than their original size, and one (and only one) is the | |
2571 | result of a `~' operator. This comparison will always fail. | |
2572 | ||
2573 | Also warn if one operand is a constant, and the constant | |
2574 | does not have all bits set that are set in the ~ operand | |
2575 | when it is extended. */ | |
2576 | ||
2577 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) | |
2578 | != (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
2579 | { | |
2580 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
2581 | primop0 = get_narrower (TREE_OPERAND (primop0, 0), | |
2582 | &unsignedp0); | |
2583 | else | |
2584 | primop1 = get_narrower (TREE_OPERAND (primop1, 0), | |
2585 | &unsignedp1); | |
2586 | ||
2587 | if (TREE_CODE (primop0) == INTEGER_CST | |
2588 | || TREE_CODE (primop1) == INTEGER_CST) | |
2589 | { | |
2590 | tree primop; | |
2591 | long constant, mask; | |
2592 | int unsignedp, bits; | |
2593 | ||
2594 | if (TREE_CODE (primop0) == INTEGER_CST) | |
2595 | { | |
2596 | primop = primop1; | |
2597 | unsignedp = unsignedp1; | |
2598 | constant = TREE_INT_CST_LOW (primop0); | |
2599 | } | |
2600 | else | |
2601 | { | |
2602 | primop = primop0; | |
2603 | unsignedp = unsignedp0; | |
2604 | constant = TREE_INT_CST_LOW (primop1); | |
2605 | } | |
2606 | ||
2607 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
2608 | if (bits < TYPE_PRECISION (result_type) | |
2609 | && bits < HOST_BITS_PER_LONG && unsignedp) | |
2610 | { | |
2611 | mask = (~0L) << bits; | |
2612 | if ((mask & constant) != mask) | |
2613 | warning ("comparison of promoted ~unsigned with constant"); | |
2614 | } | |
2615 | } | |
2616 | else if (unsignedp0 && unsignedp1 | |
2617 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
2618 | < TYPE_PRECISION (result_type)) | |
2619 | && (TYPE_PRECISION (TREE_TYPE (primop1)) | |
2620 | < TYPE_PRECISION (result_type))) | |
2621 | warning ("comparison of promoted ~unsigned with unsigned"); | |
2622 | } | |
400fbf9f JW |
2623 | } |
2624 | } | |
2625 | } | |
2626 | ||
2627 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
2628 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
2629 | Then the expression will be built. | |
2630 | It will be given type FINAL_TYPE if that is nonzero; | |
2631 | otherwise, it will be given type RESULT_TYPE. */ | |
2632 | ||
2633 | if (!result_type) | |
2634 | { | |
2635 | binary_op_error (code); | |
2636 | return error_mark_node; | |
2637 | } | |
2638 | ||
2639 | if (! converted) | |
2640 | { | |
2641 | if (TREE_TYPE (op0) != result_type) | |
2642 | op0 = convert (result_type, op0); | |
2643 | if (TREE_TYPE (op1) != result_type) | |
2644 | op1 = convert (result_type, op1); | |
2645 | } | |
2646 | ||
293c9fdd JM |
2647 | if (build_type == NULL_TREE) |
2648 | build_type = result_type; | |
2649 | ||
400fbf9f | 2650 | { |
293c9fdd | 2651 | register tree result = build (resultcode, build_type, op0, op1); |
400fbf9f JW |
2652 | register tree folded; |
2653 | ||
2654 | folded = fold (result); | |
2655 | if (folded == result) | |
2656 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2657 | if (final_type != 0) | |
2658 | return convert (final_type, folded); | |
2659 | return folded; | |
2660 | } | |
2661 | } | |
2662 | \f | |
2663 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
2664 | of pointer PTROP and integer INTOP. */ | |
2665 | ||
2666 | static tree | |
2667 | pointer_int_sum (resultcode, ptrop, intop) | |
2668 | enum tree_code resultcode; | |
2669 | register tree ptrop, intop; | |
2670 | { | |
2671 | tree size_exp; | |
2672 | ||
2673 | register tree result; | |
2674 | register tree folded; | |
2675 | ||
2676 | /* The result is a pointer of the same type that is being added. */ | |
2677 | ||
2678 | register tree result_type = TREE_TYPE (ptrop); | |
2679 | ||
2680 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2681 | { | |
2682 | if (pedantic || warn_pointer_arith) | |
2683 | pedwarn ("pointer of type `void *' used in arithmetic"); | |
2684 | size_exp = integer_one_node; | |
2685 | } | |
2686 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2687 | { | |
2688 | if (pedantic || warn_pointer_arith) | |
2689 | pedwarn ("pointer to a function used in arithmetic"); | |
2690 | size_exp = integer_one_node; | |
2691 | } | |
2692 | else | |
2693 | size_exp = c_size_in_bytes (TREE_TYPE (result_type)); | |
2694 | ||
2695 | /* If what we are about to multiply by the size of the elements | |
2696 | contains a constant term, apply distributive law | |
2697 | and multiply that constant term separately. | |
2698 | This helps produce common subexpressions. */ | |
2699 | ||
2700 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
2701 | && ! TREE_CONSTANT (intop) | |
2702 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
2703 | && TREE_CONSTANT (size_exp) | |
2704 | /* If the constant comes from pointer subtraction, | |
2705 | skip this optimization--it would cause an error. */ | |
ba11c179 RK |
2706 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE |
2707 | /* If the constant is unsigned, and smaller than the pointer size, | |
2708 | then we must skip this optimization. This is because it could cause | |
2709 | an overflow error if the constant is negative but INTOP is not. */ | |
2710 | && (! TREE_UNSIGNED (TREE_TYPE (intop)) | |
2711 | || (TYPE_PRECISION (TREE_TYPE (intop)) | |
2712 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
400fbf9f JW |
2713 | { |
2714 | enum tree_code subcode = resultcode; | |
d45cf215 | 2715 | tree int_type = TREE_TYPE (intop); |
400fbf9f JW |
2716 | if (TREE_CODE (intop) == MINUS_EXPR) |
2717 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
d45cf215 RS |
2718 | /* Convert both subexpression types to the type of intop, |
2719 | because weird cases involving pointer arithmetic | |
2720 | can result in a sum or difference with different type args. */ | |
2721 | ptrop = build_binary_op (subcode, ptrop, | |
2722 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2723 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
400fbf9f JW |
2724 | } |
2725 | ||
b200d1aa | 2726 | /* Convert the integer argument to a type the same size as sizetype |
400fbf9f JW |
2727 | so the multiply won't overflow spuriously. */ |
2728 | ||
489af5d1 RK |
2729 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) |
2730 | || TREE_UNSIGNED (TREE_TYPE (intop)) != TREE_UNSIGNED (sizetype)) | |
2731 | intop = convert (type_for_size (TYPE_PRECISION (sizetype), | |
2732 | TREE_UNSIGNED (sizetype)), intop); | |
400fbf9f | 2733 | |
6946afd3 RK |
2734 | /* Replace the integer argument with a suitable product by the object size. |
2735 | Do this multiplication as signed, then convert to the appropriate | |
2736 | pointer type (actually unsigned integral). */ | |
400fbf9f | 2737 | |
6946afd3 RK |
2738 | intop = convert (result_type, |
2739 | build_binary_op (MULT_EXPR, intop, | |
2740 | convert (TREE_TYPE (intop), size_exp), 1)); | |
400fbf9f JW |
2741 | |
2742 | /* Create the sum or difference. */ | |
2743 | ||
2744 | result = build (resultcode, result_type, ptrop, intop); | |
2745 | ||
2746 | folded = fold (result); | |
2747 | if (folded == result) | |
2748 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
2749 | return folded; | |
2750 | } | |
2751 | ||
2752 | /* Return a tree for the difference of pointers OP0 and OP1. | |
2753 | The resulting tree has type int. */ | |
2754 | ||
2755 | static tree | |
2756 | pointer_diff (op0, op1) | |
2757 | register tree op0, op1; | |
2758 | { | |
2759 | register tree result, folded; | |
2760 | tree restype = ptrdiff_type_node; | |
2761 | ||
2762 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
2763 | ||
2764 | if (pedantic || warn_pointer_arith) | |
2765 | { | |
2766 | if (TREE_CODE (target_type) == VOID_TYPE) | |
2767 | pedwarn ("pointer of type `void *' used in subtraction"); | |
2768 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
2769 | pedwarn ("pointer to a function used in subtraction"); | |
2770 | } | |
2771 | ||
2772 | /* First do the subtraction as integers; | |
04044297 MM |
2773 | then drop through to build the divide operator. |
2774 | Do not do default conversions on the minus operator | |
2775 | in case restype is a short type. */ | |
400fbf9f JW |
2776 | |
2777 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), | |
04044297 | 2778 | convert (restype, op1), 0); |
ea8dd784 JW |
2779 | /* This generates an error if op1 is pointer to incomplete type. */ |
2780 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) | |
2781 | error ("arithmetic on pointer to an incomplete type"); | |
6946afd3 | 2782 | |
ea8dd784 | 2783 | /* This generates an error if op0 is pointer to incomplete type. */ |
400fbf9f JW |
2784 | op1 = c_size_in_bytes (target_type); |
2785 | ||
2786 | /* Divide by the size, in easiest possible way. */ | |
2787 | ||
6946afd3 | 2788 | result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); |
400fbf9f JW |
2789 | |
2790 | folded = fold (result); | |
2791 | if (folded == result) | |
2792 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2793 | return folded; | |
2794 | } | |
2795 | \f | |
2796 | /* Construct and perhaps optimize a tree representation | |
2797 | for a unary operation. CODE, a tree_code, specifies the operation | |
2798 | and XARG is the operand. NOCONVERT nonzero suppresses | |
2799 | the default promotions (such as from short to int). */ | |
2800 | ||
2801 | tree | |
2802 | build_unary_op (code, xarg, noconvert) | |
2803 | enum tree_code code; | |
2804 | tree xarg; | |
2805 | int noconvert; | |
2806 | { | |
2807 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
2808 | register tree arg = xarg; | |
2809 | register tree argtype = 0; | |
2810 | register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); | |
2811 | char *errstring = NULL; | |
2812 | tree val; | |
2813 | ||
2814 | if (typecode == ERROR_MARK) | |
2815 | return error_mark_node; | |
2816 | if (typecode == ENUMERAL_TYPE) | |
2817 | typecode = INTEGER_TYPE; | |
2818 | ||
2819 | switch (code) | |
2820 | { | |
2821 | case CONVERT_EXPR: | |
2822 | /* This is used for unary plus, because a CONVERT_EXPR | |
2823 | is enough to prevent anybody from looking inside for | |
2824 | associativity, but won't generate any code. */ | |
b6a10c9f RS |
2825 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2826 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2827 | errstring = "wrong type argument to unary plus"; |
2828 | else if (!noconvert) | |
2829 | arg = default_conversion (arg); | |
2830 | break; | |
2831 | ||
2832 | case NEGATE_EXPR: | |
b6a10c9f RS |
2833 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2834 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2835 | errstring = "wrong type argument to unary minus"; |
2836 | else if (!noconvert) | |
2837 | arg = default_conversion (arg); | |
2838 | break; | |
2839 | ||
2840 | case BIT_NOT_EXPR: | |
1c2a9b35 RS |
2841 | if (typecode == COMPLEX_TYPE) |
2842 | { | |
2843 | code = CONJ_EXPR; | |
2844 | if (!noconvert) | |
2845 | arg = default_conversion (arg); | |
2846 | } | |
2847 | else if (typecode != INTEGER_TYPE) | |
400fbf9f JW |
2848 | errstring = "wrong type argument to bit-complement"; |
2849 | else if (!noconvert) | |
2850 | arg = default_conversion (arg); | |
2851 | break; | |
2852 | ||
2853 | case ABS_EXPR: | |
b6a10c9f RS |
2854 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2855 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2856 | errstring = "wrong type argument to abs"; |
2857 | else if (!noconvert) | |
2858 | arg = default_conversion (arg); | |
2859 | break; | |
2860 | ||
1c2a9b35 RS |
2861 | case CONJ_EXPR: |
2862 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
2863 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
2864 | || typecode == COMPLEX_TYPE)) | |
2865 | errstring = "wrong type argument to conjugation"; | |
2866 | else if (!noconvert) | |
2867 | arg = default_conversion (arg); | |
2868 | break; | |
2869 | ||
400fbf9f JW |
2870 | case TRUTH_NOT_EXPR: |
2871 | if (typecode != INTEGER_TYPE | |
2872 | && typecode != REAL_TYPE && typecode != POINTER_TYPE | |
b6a10c9f | 2873 | && typecode != COMPLEX_TYPE |
400fbf9f JW |
2874 | /* These will convert to a pointer. */ |
2875 | && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE) | |
2876 | { | |
2877 | errstring = "wrong type argument to unary exclamation mark"; | |
2878 | break; | |
2879 | } | |
2880 | arg = truthvalue_conversion (arg); | |
2881 | return invert_truthvalue (arg); | |
2882 | ||
2883 | case NOP_EXPR: | |
2884 | break; | |
b6a10c9f RS |
2885 | |
2886 | case REALPART_EXPR: | |
2887 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2888 | return TREE_REALPART (arg); | |
2889 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2890 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2891 | else | |
2892 | return arg; | |
2893 | ||
2894 | case IMAGPART_EXPR: | |
2895 | if (TREE_CODE (arg) == COMPLEX_CST) | |
2896 | return TREE_IMAGPART (arg); | |
2897 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
2898 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
2899 | else | |
2900 | return convert (TREE_TYPE (arg), integer_zero_node); | |
400fbf9f JW |
2901 | |
2902 | case PREINCREMENT_EXPR: | |
2903 | case POSTINCREMENT_EXPR: | |
2904 | case PREDECREMENT_EXPR: | |
2905 | case POSTDECREMENT_EXPR: | |
2906 | /* Handle complex lvalues (when permitted) | |
2907 | by reduction to simpler cases. */ | |
2908 | ||
2909 | val = unary_complex_lvalue (code, arg); | |
2910 | if (val != 0) | |
2911 | return val; | |
2912 | ||
b6a10c9f RS |
2913 | /* Increment or decrement the real part of the value, |
2914 | and don't change the imaginary part. */ | |
2915 | if (typecode == COMPLEX_TYPE) | |
2916 | { | |
2917 | tree real, imag; | |
2918 | ||
2919 | arg = stabilize_reference (arg); | |
2920 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
2921 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
2922 | return build (COMPLEX_EXPR, TREE_TYPE (arg), | |
2923 | build_unary_op (code, real, 1), imag); | |
2924 | } | |
2925 | ||
400fbf9f JW |
2926 | /* Report invalid types. */ |
2927 | ||
2928 | if (typecode != POINTER_TYPE | |
2929 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) | |
2930 | { | |
2931 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
2932 | errstring ="wrong type argument to increment"; | |
2933 | else | |
2934 | errstring ="wrong type argument to decrement"; | |
2935 | break; | |
2936 | } | |
2937 | ||
2938 | { | |
2939 | register tree inc; | |
2940 | tree result_type = TREE_TYPE (arg); | |
2941 | ||
2942 | arg = get_unwidened (arg, 0); | |
2943 | argtype = TREE_TYPE (arg); | |
2944 | ||
2945 | /* Compute the increment. */ | |
2946 | ||
2947 | if (typecode == POINTER_TYPE) | |
2948 | { | |
6bc4e3d0 RS |
2949 | /* If pointer target is an undefined struct, |
2950 | we just cannot know how to do the arithmetic. */ | |
2951 | if (TYPE_SIZE (TREE_TYPE (result_type)) == 0) | |
2952 | error ("%s of pointer to unknown structure", | |
2953 | ((code == PREINCREMENT_EXPR | |
2954 | || code == POSTINCREMENT_EXPR) | |
2955 | ? "increment" : "decrement")); | |
2956 | else if ((pedantic || warn_pointer_arith) | |
2957 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
2958 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
400fbf9f JW |
2959 | pedwarn ("wrong type argument to %s", |
2960 | ((code == PREINCREMENT_EXPR | |
2961 | || code == POSTINCREMENT_EXPR) | |
2962 | ? "increment" : "decrement")); | |
0e9cff7f | 2963 | inc = c_size_in_bytes (TREE_TYPE (result_type)); |
400fbf9f JW |
2964 | } |
2965 | else | |
2966 | inc = integer_one_node; | |
2967 | ||
2968 | inc = convert (argtype, inc); | |
2969 | ||
2970 | /* Handle incrementing a cast-expression. */ | |
2971 | ||
2972 | while (1) | |
2973 | switch (TREE_CODE (arg)) | |
2974 | { | |
2975 | case NOP_EXPR: | |
2976 | case CONVERT_EXPR: | |
2977 | case FLOAT_EXPR: | |
2978 | case FIX_TRUNC_EXPR: | |
2979 | case FIX_FLOOR_EXPR: | |
2980 | case FIX_ROUND_EXPR: | |
2981 | case FIX_CEIL_EXPR: | |
ee71df46 | 2982 | pedantic_lvalue_warning (CONVERT_EXPR); |
400fbf9f JW |
2983 | /* If the real type has the same machine representation |
2984 | as the type it is cast to, we can make better output | |
2985 | by adding directly to the inside of the cast. */ | |
2986 | if ((TREE_CODE (TREE_TYPE (arg)) | |
2987 | == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
2988 | && (TYPE_MODE (TREE_TYPE (arg)) | |
2989 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0))))) | |
2990 | arg = TREE_OPERAND (arg, 0); | |
2991 | else | |
2992 | { | |
2993 | tree incremented, modify, value; | |
400fbf9f JW |
2994 | arg = stabilize_reference (arg); |
2995 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
2996 | value = arg; | |
2997 | else | |
2998 | value = save_expr (arg); | |
2999 | incremented = build (((code == PREINCREMENT_EXPR | |
3000 | || code == POSTINCREMENT_EXPR) | |
3001 | ? PLUS_EXPR : MINUS_EXPR), | |
3002 | argtype, value, inc); | |
3003 | TREE_SIDE_EFFECTS (incremented) = 1; | |
3004 | modify = build_modify_expr (arg, NOP_EXPR, incremented); | |
3005 | value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); | |
3006 | TREE_USED (value) = 1; | |
3007 | return value; | |
3008 | } | |
3009 | break; | |
3010 | ||
3011 | default: | |
3012 | goto give_up; | |
3013 | } | |
3014 | give_up: | |
3015 | ||
3016 | /* Complain about anything else that is not a true lvalue. */ | |
3017 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
3018 | || code == POSTINCREMENT_EXPR) | |
3019 | ? "increment" : "decrement"))) | |
3020 | return error_mark_node; | |
3021 | ||
3022 | /* Report a read-only lvalue. */ | |
26b3c423 | 3023 | if (TREE_READONLY (arg)) |
400fbf9f JW |
3024 | readonly_warning (arg, |
3025 | ((code == PREINCREMENT_EXPR | |
3026 | || code == POSTINCREMENT_EXPR) | |
3027 | ? "increment" : "decrement")); | |
3028 | ||
3029 | val = build (code, TREE_TYPE (arg), arg, inc); | |
3030 | TREE_SIDE_EFFECTS (val) = 1; | |
3031 | val = convert (result_type, val); | |
3032 | if (TREE_CODE (val) != code) | |
3033 | TREE_NO_UNUSED_WARNING (val) = 1; | |
3034 | return val; | |
3035 | } | |
3036 | ||
3037 | case ADDR_EXPR: | |
3038 | /* Note that this operation never does default_conversion | |
3039 | regardless of NOCONVERT. */ | |
3040 | ||
3041 | /* Let &* cancel out to simplify resulting code. */ | |
3042 | if (TREE_CODE (arg) == INDIRECT_REF) | |
3043 | { | |
3044 | /* Don't let this be an lvalue. */ | |
3045 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
3046 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
3047 | return TREE_OPERAND (arg, 0); | |
3048 | } | |
3049 | ||
3050 | /* For &x[y], return x+y */ | |
3051 | if (TREE_CODE (arg) == ARRAY_REF) | |
3052 | { | |
3053 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
3054 | return error_mark_node; | |
3055 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
3056 | TREE_OPERAND (arg, 1), 1); | |
3057 | } | |
3058 | ||
3059 | /* Handle complex lvalues (when permitted) | |
3060 | by reduction to simpler cases. */ | |
3061 | val = unary_complex_lvalue (code, arg); | |
3062 | if (val != 0) | |
3063 | return val; | |
3064 | ||
3065 | #if 0 /* Turned off because inconsistent; | |
3066 | float f; *&(int)f = 3.4 stores in int format | |
3067 | whereas (int)f = 3.4 stores in float format. */ | |
3068 | /* Address of a cast is just a cast of the address | |
3069 | of the operand of the cast. */ | |
3070 | switch (TREE_CODE (arg)) | |
3071 | { | |
3072 | case NOP_EXPR: | |
3073 | case CONVERT_EXPR: | |
3074 | case FLOAT_EXPR: | |
3075 | case FIX_TRUNC_EXPR: | |
3076 | case FIX_FLOOR_EXPR: | |
3077 | case FIX_ROUND_EXPR: | |
3078 | case FIX_CEIL_EXPR: | |
3079 | if (pedantic) | |
3080 | pedwarn ("ANSI C forbids the address of a cast expression"); | |
3081 | return convert (build_pointer_type (TREE_TYPE (arg)), | |
3082 | build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), | |
3083 | 0)); | |
3084 | } | |
3085 | #endif | |
3086 | ||
3087 | /* Allow the address of a constructor if all the elements | |
3088 | are constant. */ | |
3089 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
3090 | ; | |
3091 | /* Anything not already handled and not a true memory reference | |
3092 | is an error. */ | |
3093 | else if (typecode != FUNCTION_TYPE && !lvalue_or_else (arg, "unary `&'")) | |
3094 | return error_mark_node; | |
3095 | ||
3096 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
3097 | argtype = TREE_TYPE (arg); | |
3098 | /* If the lvalue is const or volatile, | |
3099 | merge that into the type that the address will point to. */ | |
3100 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
3101 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
3102 | { | |
3103 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
3104 | argtype = c_build_type_variant (argtype, | |
3105 | TREE_READONLY (arg), | |
3106 | TREE_THIS_VOLATILE (arg)); | |
3107 | } | |
3108 | ||
3109 | argtype = build_pointer_type (argtype); | |
3110 | ||
3111 | if (mark_addressable (arg) == 0) | |
3112 | return error_mark_node; | |
3113 | ||
3114 | { | |
3115 | tree addr; | |
3116 | ||
3117 | if (TREE_CODE (arg) == COMPONENT_REF) | |
3118 | { | |
3119 | tree field = TREE_OPERAND (arg, 1); | |
3120 | ||
3121 | addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3122 | ||
ef86d2a6 | 3123 | if (DECL_C_BIT_FIELD (field)) |
400fbf9f JW |
3124 | { |
3125 | error ("attempt to take address of bit-field structure member `%s'", | |
3126 | IDENTIFIER_POINTER (DECL_NAME (field))); | |
3127 | return error_mark_node; | |
3128 | } | |
3129 | ||
3130 | addr = convert (argtype, addr); | |
3131 | ||
3132 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
3133 | { | |
3134 | tree offset | |
3135 | = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
3136 | size_int (BITS_PER_UNIT)); | |
3137 | int flag = TREE_CONSTANT (addr); | |
3138 | addr = fold (build (PLUS_EXPR, argtype, | |
3139 | addr, convert (argtype, offset))); | |
3140 | TREE_CONSTANT (addr) = flag; | |
3141 | } | |
3142 | } | |
3143 | else | |
3144 | addr = build1 (code, argtype, arg); | |
3145 | ||
3146 | /* Address of a static or external variable or | |
8706edbc RS |
3147 | file-scope function counts as a constant. */ |
3148 | if (staticp (arg) | |
3149 | && ! (TREE_CODE (arg) == FUNCTION_DECL | |
3150 | && DECL_CONTEXT (arg) != 0)) | |
7d2d49af | 3151 | TREE_CONSTANT (addr) = 1; |
400fbf9f JW |
3152 | return addr; |
3153 | } | |
e9a25f70 JL |
3154 | |
3155 | default: | |
3156 | break; | |
400fbf9f JW |
3157 | } |
3158 | ||
3159 | if (!errstring) | |
3160 | { | |
3161 | if (argtype == 0) | |
3162 | argtype = TREE_TYPE (arg); | |
3163 | return fold (build1 (code, argtype, arg)); | |
3164 | } | |
3165 | ||
3166 | error (errstring); | |
3167 | return error_mark_node; | |
3168 | } | |
3169 | ||
3170 | #if 0 | |
3171 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, | |
3172 | convert ARG with the same conversions in the same order | |
3173 | and return the result. */ | |
3174 | ||
3175 | static tree | |
3176 | convert_sequence (conversions, arg) | |
3177 | tree conversions; | |
3178 | tree arg; | |
3179 | { | |
3180 | switch (TREE_CODE (conversions)) | |
3181 | { | |
3182 | case NOP_EXPR: | |
3183 | case CONVERT_EXPR: | |
3184 | case FLOAT_EXPR: | |
3185 | case FIX_TRUNC_EXPR: | |
3186 | case FIX_FLOOR_EXPR: | |
3187 | case FIX_ROUND_EXPR: | |
3188 | case FIX_CEIL_EXPR: | |
3189 | return convert (TREE_TYPE (conversions), | |
3190 | convert_sequence (TREE_OPERAND (conversions, 0), | |
3191 | arg)); | |
3192 | ||
3193 | default: | |
3194 | return arg; | |
3195 | } | |
3196 | } | |
3197 | #endif /* 0 */ | |
3198 | ||
3199 | /* Return nonzero if REF is an lvalue valid for this language. | |
3200 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
1394aabd | 3201 | Lvalues can have their address taken, unless they have DECL_REGISTER. */ |
400fbf9f JW |
3202 | |
3203 | int | |
3204 | lvalue_p (ref) | |
3205 | tree ref; | |
3206 | { | |
3207 | register enum tree_code code = TREE_CODE (ref); | |
3208 | ||
3209 | switch (code) | |
3210 | { | |
b6a10c9f RS |
3211 | case REALPART_EXPR: |
3212 | case IMAGPART_EXPR: | |
400fbf9f JW |
3213 | case COMPONENT_REF: |
3214 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
3215 | ||
3216 | case STRING_CST: | |
3217 | return 1; | |
3218 | ||
3219 | case INDIRECT_REF: | |
3220 | case ARRAY_REF: | |
3221 | case VAR_DECL: | |
3222 | case PARM_DECL: | |
3223 | case RESULT_DECL: | |
3224 | case ERROR_MARK: | |
e9a25f70 JL |
3225 | return (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE |
3226 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE); | |
cff9c407 RK |
3227 | |
3228 | case BIND_EXPR: | |
3229 | case RTL_EXPR: | |
e9a25f70 JL |
3230 | return TREE_CODE (TREE_TYPE (ref)) == ARRAY_TYPE; |
3231 | ||
3232 | default: | |
3233 | return 0; | |
400fbf9f | 3234 | } |
400fbf9f JW |
3235 | } |
3236 | ||
3237 | /* Return nonzero if REF is an lvalue valid for this language; | |
3238 | otherwise, print an error message and return zero. */ | |
3239 | ||
3240 | int | |
3241 | lvalue_or_else (ref, string) | |
3242 | tree ref; | |
3243 | char *string; | |
3244 | { | |
3245 | int win = lvalue_p (ref); | |
3246 | if (! win) | |
3247 | error ("invalid lvalue in %s", string); | |
3248 | return win; | |
3249 | } | |
3250 | ||
3251 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
3252 | for certain kinds of expressions which are not really lvalues | |
3253 | but which we can accept as lvalues. | |
3254 | ||
3255 | If ARG is not a kind of expression we can handle, return zero. */ | |
3256 | ||
3257 | static tree | |
3258 | unary_complex_lvalue (code, arg) | |
3259 | enum tree_code code; | |
3260 | tree arg; | |
3261 | { | |
3262 | /* Handle (a, b) used as an "lvalue". */ | |
3263 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
3264 | { | |
3265 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
e9a25f70 JL |
3266 | |
3267 | /* If this returns a function type, it isn't really being used as | |
3268 | an lvalue, so don't issue a warning about it. */ | |
3269 | if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE) | |
3270 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
3271 | ||
400fbf9f JW |
3272 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), |
3273 | TREE_OPERAND (arg, 0), real_result); | |
3274 | } | |
3275 | ||
3276 | /* Handle (a ? b : c) used as an "lvalue". */ | |
3277 | if (TREE_CODE (arg) == COND_EXPR) | |
3278 | { | |
3279 | pedantic_lvalue_warning (COND_EXPR); | |
e9a25f70 JL |
3280 | if (TREE_CODE (TREE_TYPE (arg)) != FUNCTION_TYPE) |
3281 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
3282 | ||
400fbf9f JW |
3283 | return (build_conditional_expr |
3284 | (TREE_OPERAND (arg, 0), | |
3285 | build_unary_op (code, TREE_OPERAND (arg, 1), 0), | |
3286 | build_unary_op (code, TREE_OPERAND (arg, 2), 0))); | |
3287 | } | |
3288 | ||
3289 | return 0; | |
3290 | } | |
3291 | ||
3292 | /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR | |
3293 | COMPOUND_EXPR, or CONVERT_EXPR (for casts). */ | |
3294 | ||
3295 | static void | |
3296 | pedantic_lvalue_warning (code) | |
3297 | enum tree_code code; | |
3298 | { | |
3299 | if (pedantic) | |
3300 | pedwarn ("ANSI C forbids use of %s expressions as lvalues", | |
3301 | code == COND_EXPR ? "conditional" | |
3302 | : code == COMPOUND_EXPR ? "compound" : "cast"); | |
3303 | } | |
3304 | \f | |
3305 | /* Warn about storing in something that is `const'. */ | |
3306 | ||
3307 | void | |
3308 | readonly_warning (arg, string) | |
3309 | tree arg; | |
3310 | char *string; | |
3311 | { | |
3312 | char buf[80]; | |
3313 | strcpy (buf, string); | |
3314 | ||
3791970d | 3315 | /* Forbid assignments to iterators. */ |
550707f7 | 3316 | if (TREE_CODE (arg) == VAR_DECL && ITERATOR_P (arg)) |
3791970d RS |
3317 | { |
3318 | strcat (buf, " of iterator `%s'"); | |
550707f7 | 3319 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg))); |
3791970d RS |
3320 | } |
3321 | ||
400fbf9f JW |
3322 | if (TREE_CODE (arg) == COMPONENT_REF) |
3323 | { | |
3324 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
3325 | readonly_warning (TREE_OPERAND (arg, 0), string); | |
3326 | else | |
3327 | { | |
3328 | strcat (buf, " of read-only member `%s'"); | |
3329 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1)))); | |
3330 | } | |
3331 | } | |
3332 | else if (TREE_CODE (arg) == VAR_DECL) | |
3333 | { | |
3334 | strcat (buf, " of read-only variable `%s'"); | |
3335 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3336 | } | |
3337 | else | |
3338 | { | |
3339 | pedwarn ("%s of read-only location", buf); | |
3340 | } | |
3341 | } | |
3342 | \f | |
3343 | /* Mark EXP saying that we need to be able to take the | |
3344 | address of it; it should not be allocated in a register. | |
3345 | Value is 1 if successful. */ | |
3346 | ||
3347 | int | |
3348 | mark_addressable (exp) | |
3349 | tree exp; | |
3350 | { | |
3351 | register tree x = exp; | |
3352 | while (1) | |
3353 | switch (TREE_CODE (x)) | |
3354 | { | |
400fbf9f | 3355 | case COMPONENT_REF: |
1598f4da | 3356 | if (DECL_C_BIT_FIELD (TREE_OPERAND (x, 1))) |
36c336d1 RK |
3357 | { |
3358 | error ("cannot take address of bitfield `%s'", | |
3359 | IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (x, 1)))); | |
3360 | return 0; | |
3361 | } | |
1598f4da | 3362 | |
0f41302f | 3363 | /* ... fall through ... */ |
1598f4da RK |
3364 | |
3365 | case ADDR_EXPR: | |
400fbf9f | 3366 | case ARRAY_REF: |
ce95080d RS |
3367 | case REALPART_EXPR: |
3368 | case IMAGPART_EXPR: | |
400fbf9f JW |
3369 | x = TREE_OPERAND (x, 0); |
3370 | break; | |
3371 | ||
3372 | case CONSTRUCTOR: | |
3373 | TREE_ADDRESSABLE (x) = 1; | |
3374 | return 1; | |
3375 | ||
3376 | case VAR_DECL: | |
3377 | case CONST_DECL: | |
3378 | case PARM_DECL: | |
3379 | case RESULT_DECL: | |
1394aabd RS |
3380 | if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
3381 | && DECL_NONLOCAL (x)) | |
4bb6d2f8 RS |
3382 | { |
3383 | if (TREE_PUBLIC (x)) | |
3384 | { | |
3385 | error ("global register variable `%s' used in nested function", | |
3386 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3387 | return 0; | |
3388 | } | |
3389 | pedwarn ("register variable `%s' used in nested function", | |
3390 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3391 | } | |
1394aabd | 3392 | else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)) |
400fbf9f JW |
3393 | { |
3394 | if (TREE_PUBLIC (x)) | |
3395 | { | |
3396 | error ("address of global register variable `%s' requested", | |
3397 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3398 | return 0; | |
3399 | } | |
bbbd6700 RK |
3400 | |
3401 | /* If we are making this addressable due to its having | |
3402 | volatile components, give a different error message. Also | |
3403 | handle the case of an unnamed parameter by not trying | |
3404 | to give the name. */ | |
3405 | ||
3406 | else if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (x))) | |
3407 | { | |
3408 | error ("cannot put object with volatile field into register"); | |
3409 | return 0; | |
3410 | } | |
3411 | ||
400fbf9f JW |
3412 | pedwarn ("address of register variable `%s' requested", |
3413 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3414 | } | |
3415 | put_var_into_stack (x); | |
3416 | ||
3417 | /* drops in */ | |
3418 | case FUNCTION_DECL: | |
3419 | TREE_ADDRESSABLE (x) = 1; | |
3420 | #if 0 /* poplevel deals with this now. */ | |
3421 | if (DECL_CONTEXT (x) == 0) | |
3422 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
3423 | #endif | |
3424 | ||
3425 | default: | |
3426 | return 1; | |
3427 | } | |
3428 | } | |
3429 | \f | |
3430 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
3431 | ||
3432 | tree | |
3433 | build_conditional_expr (ifexp, op1, op2) | |
3434 | tree ifexp, op1, op2; | |
3435 | { | |
3436 | register tree type1; | |
3437 | register tree type2; | |
3438 | register enum tree_code code1; | |
3439 | register enum tree_code code2; | |
3440 | register tree result_type = NULL; | |
fd5d5b94 | 3441 | tree orig_op1 = op1, orig_op2 = op2; |
400fbf9f | 3442 | |
400fbf9f JW |
3443 | ifexp = truthvalue_conversion (default_conversion (ifexp)); |
3444 | ||
400fbf9f JW |
3445 | #if 0 /* Produces wrong result if within sizeof. */ |
3446 | /* Don't promote the operands separately if they promote | |
3447 | the same way. Return the unpromoted type and let the combined | |
3448 | value get promoted if necessary. */ | |
3449 | ||
3450 | if (TREE_TYPE (op1) == TREE_TYPE (op2) | |
3451 | && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE | |
3452 | && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE | |
3453 | && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE) | |
3454 | { | |
3455 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
a29f2ec1 | 3456 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f JW |
3457 | |
3458 | return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2)); | |
3459 | } | |
3460 | #endif | |
3461 | ||
e855c5ce | 3462 | /* Promote both alternatives. */ |
400fbf9f JW |
3463 | |
3464 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
3465 | op1 = default_conversion (op1); | |
3466 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
3467 | op2 = default_conversion (op2); | |
3468 | ||
e855c5ce RS |
3469 | if (TREE_CODE (ifexp) == ERROR_MARK |
3470 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
3471 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
3472 | return error_mark_node; | |
3473 | ||
400fbf9f JW |
3474 | type1 = TREE_TYPE (op1); |
3475 | code1 = TREE_CODE (type1); | |
3476 | type2 = TREE_TYPE (op2); | |
3477 | code2 = TREE_CODE (type2); | |
3478 | ||
3479 | /* Quickly detect the usual case where op1 and op2 have the same type | |
3480 | after promotion. */ | |
1ad409d2 RS |
3481 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
3482 | { | |
3483 | if (type1 == type2) | |
3484 | result_type = type1; | |
3485 | else | |
3486 | result_type = TYPE_MAIN_VARIANT (type1); | |
3487 | } | |
400fbf9f JW |
3488 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) |
3489 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
3490 | { | |
3491 | result_type = common_type (type1, type2); | |
3492 | } | |
3493 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3494 | { | |
3495 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
3496 | pedwarn ("ANSI C forbids conditional expr with only one void side"); | |
3497 | result_type = void_type_node; | |
3498 | } | |
3499 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3500 | { | |
3501 | if (comp_target_types (type1, type2)) | |
3502 | result_type = common_type (type1, type2); | |
fd5d5b94 RS |
3503 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node |
3504 | && TREE_CODE (orig_op1) != NOP_EXPR) | |
400fbf9f | 3505 | result_type = qualify_type (type2, type1); |
fd5d5b94 RS |
3506 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node |
3507 | && TREE_CODE (orig_op2) != NOP_EXPR) | |
400fbf9f JW |
3508 | result_type = qualify_type (type1, type2); |
3509 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) | |
3510 | { | |
3511 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) | |
3512 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3513 | result_type = qualify_type (type1, type2); | |
3514 | } | |
3515 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
3516 | { | |
3517 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) | |
3518 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3519 | result_type = qualify_type (type2, type1); | |
3520 | } | |
3521 | else | |
3522 | { | |
3523 | pedwarn ("pointer type mismatch in conditional expression"); | |
3524 | result_type = build_pointer_type (void_type_node); | |
3525 | } | |
3526 | } | |
3527 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3528 | { | |
3529 | if (! integer_zerop (op2)) | |
3530 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3531 | else | |
3532 | { | |
3533 | op2 = null_pointer_node; | |
3534 | #if 0 /* The spec seems to say this is permitted. */ | |
3535 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
3536 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3537 | #endif | |
3538 | } | |
3539 | result_type = type1; | |
3540 | } | |
3541 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3542 | { | |
3543 | if (!integer_zerop (op1)) | |
3544 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3545 | else | |
3546 | { | |
3547 | op1 = null_pointer_node; | |
3548 | #if 0 /* The spec seems to say this is permitted. */ | |
3549 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
3550 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3551 | #endif | |
3552 | } | |
3553 | result_type = type2; | |
3554 | } | |
3555 | ||
3556 | if (!result_type) | |
3557 | { | |
3558 | if (flag_cond_mismatch) | |
3559 | result_type = void_type_node; | |
3560 | else | |
3561 | { | |
3562 | error ("type mismatch in conditional expression"); | |
3563 | return error_mark_node; | |
3564 | } | |
3565 | } | |
3566 | ||
1dfdf85d RS |
3567 | /* Merge const and volatile flags of the incoming types. */ |
3568 | result_type | |
3569 | = build_type_variant (result_type, | |
48c73063 RS |
3570 | TREE_READONLY (op1) || TREE_READONLY (op2), |
3571 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
e58cd767 | 3572 | |
400fbf9f | 3573 | if (result_type != TREE_TYPE (op1)) |
e58cd767 | 3574 | op1 = convert_and_check (result_type, op1); |
400fbf9f | 3575 | if (result_type != TREE_TYPE (op2)) |
e58cd767 | 3576 | op2 = convert_and_check (result_type, op2); |
400fbf9f JW |
3577 | |
3578 | #if 0 | |
3579 | if (code1 == RECORD_TYPE || code1 == UNION_TYPE) | |
3580 | { | |
3581 | result_type = TREE_TYPE (op1); | |
3582 | if (TREE_CONSTANT (ifexp)) | |
a29f2ec1 | 3583 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f JW |
3584 | |
3585 | if (TYPE_MODE (result_type) == BLKmode) | |
3586 | { | |
3587 | register tree tempvar | |
3588 | = build_decl (VAR_DECL, NULL_TREE, result_type); | |
3589 | register tree xop1 = build_modify_expr (tempvar, op1); | |
3590 | register tree xop2 = build_modify_expr (tempvar, op2); | |
3591 | register tree result = fold (build (COND_EXPR, result_type, | |
3592 | ifexp, xop1, xop2)); | |
3593 | ||
3594 | layout_decl (tempvar, TYPE_ALIGN (result_type)); | |
3595 | /* No way to handle variable-sized objects here. | |
3596 | I fear that the entire handling of BLKmode conditional exprs | |
3597 | needs to be redone. */ | |
3598 | if (TREE_CODE (DECL_SIZE (tempvar)) != INTEGER_CST) | |
3599 | abort (); | |
3600 | DECL_RTL (tempvar) | |
3601 | = assign_stack_local (DECL_MODE (tempvar), | |
3602 | (TREE_INT_CST_LOW (DECL_SIZE (tempvar)) | |
3603 | + BITS_PER_UNIT - 1) | |
3604 | / BITS_PER_UNIT, | |
3605 | 0); | |
3606 | ||
3607 | TREE_SIDE_EFFECTS (result) | |
3608 | = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1) | |
3609 | | TREE_SIDE_EFFECTS (op2); | |
3610 | return build (COMPOUND_EXPR, result_type, result, tempvar); | |
3611 | } | |
3612 | } | |
3613 | #endif /* 0 */ | |
5abb45f2 RS |
3614 | |
3615 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
a29f2ec1 | 3616 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f | 3617 | |
400fbf9f JW |
3618 | return fold (build (COND_EXPR, result_type, ifexp, op1, op2)); |
3619 | } | |
3620 | \f | |
3621 | /* Given a list of expressions, return a compound expression | |
3622 | that performs them all and returns the value of the last of them. */ | |
3623 | ||
3624 | tree | |
3625 | build_compound_expr (list) | |
3626 | tree list; | |
82bde854 | 3627 | { |
43a5a542 | 3628 | return internal_build_compound_expr (list, TRUE); |
82bde854 MM |
3629 | } |
3630 | ||
3631 | static tree | |
3632 | internal_build_compound_expr (list, first_p) | |
3633 | tree list; | |
3634 | int first_p; | |
400fbf9f JW |
3635 | { |
3636 | register tree rest; | |
3637 | ||
3638 | if (TREE_CHAIN (list) == 0) | |
3639 | { | |
6dc42e49 | 3640 | #if 0 /* If something inside inhibited lvalueness, we should not override. */ |
400fbf9f JW |
3641 | /* Consider (x, y+0), which is not an lvalue since y+0 is not. */ |
3642 | ||
3643 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3644 | if (TREE_CODE (list) == NON_LVALUE_EXPR) | |
3645 | list = TREE_OPERAND (list, 0); | |
3646 | #endif | |
3647 | ||
439f6027 | 3648 | /* Don't let (0, 0) be null pointer constant. */ |
82bde854 | 3649 | if (!first_p && integer_zerop (TREE_VALUE (list))) |
439f6027 RS |
3650 | return non_lvalue (TREE_VALUE (list)); |
3651 | return TREE_VALUE (list); | |
400fbf9f JW |
3652 | } |
3653 | ||
3654 | if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0) | |
3655 | { | |
3656 | /* Convert arrays to pointers when there really is a comma operator. */ | |
3657 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE) | |
3658 | TREE_VALUE (TREE_CHAIN (list)) | |
3659 | = default_conversion (TREE_VALUE (TREE_CHAIN (list))); | |
3660 | } | |
3661 | ||
82bde854 | 3662 | rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE); |
400fbf9f | 3663 | |
0e7c47fa RK |
3664 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) |
3665 | { | |
3666 | /* The left-hand operand of a comma expression is like an expression | |
3667 | statement: with -W or -Wunused, we should warn if it doesn't have | |
3668 | any side-effects, unless it was explicitly cast to (void). */ | |
3669 | if ((extra_warnings || warn_unused) | |
3670 | && ! (TREE_CODE (TREE_VALUE (list)) == CONVERT_EXPR | |
3671 | && TREE_TYPE (TREE_VALUE (list)) == void_type_node)) | |
3672 | warning ("left-hand operand of comma expression has no effect"); | |
3673 | ||
3674 | /* When pedantic, a compound expression can be neither an lvalue | |
3675 | nor an integer constant expression. */ | |
3676 | if (! pedantic) | |
3677 | return rest; | |
3678 | } | |
3679 | ||
3680 | /* With -Wunused, we should also warn if the left-hand operand does have | |
3681 | side-effects, but computes a value which is not used. For example, in | |
3682 | `foo() + bar(), baz()' the result of the `+' operator is not used, | |
3683 | so we should issue a warning. */ | |
3684 | else if (warn_unused) | |
3685 | warn_if_unused_value (TREE_VALUE (list)); | |
400fbf9f JW |
3686 | |
3687 | return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest); | |
3688 | } | |
3689 | ||
3690 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ | |
3691 | ||
3692 | tree | |
3693 | build_c_cast (type, expr) | |
3694 | register tree type; | |
3695 | tree expr; | |
3696 | { | |
3697 | register tree value = expr; | |
3698 | ||
3699 | if (type == error_mark_node || expr == error_mark_node) | |
3700 | return error_mark_node; | |
3701 | type = TYPE_MAIN_VARIANT (type); | |
3702 | ||
3703 | #if 0 | |
3704 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3705 | if (TREE_CODE (value) == NON_LVALUE_EXPR) | |
3706 | value = TREE_OPERAND (value, 0); | |
3707 | #endif | |
3708 | ||
3709 | if (TREE_CODE (type) == ARRAY_TYPE) | |
3710 | { | |
3711 | error ("cast specifies array type"); | |
3712 | return error_mark_node; | |
3713 | } | |
3714 | ||
3715 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
3716 | { | |
3717 | error ("cast specifies function type"); | |
3718 | return error_mark_node; | |
3719 | } | |
3720 | ||
3721 | if (type == TREE_TYPE (value)) | |
3722 | { | |
3723 | if (pedantic) | |
3724 | { | |
3725 | if (TREE_CODE (type) == RECORD_TYPE | |
3726 | || TREE_CODE (type) == UNION_TYPE) | |
3727 | pedwarn ("ANSI C forbids casting nonscalar to the same type"); | |
3728 | } | |
3729 | } | |
3730 | else if (TREE_CODE (type) == UNION_TYPE) | |
3731 | { | |
3732 | tree field; | |
0c16ddf7 RS |
3733 | if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE |
3734 | || TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE) | |
3735 | value = default_conversion (value); | |
3736 | ||
400fbf9f JW |
3737 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
3738 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
3739 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
3740 | break; | |
3741 | ||
3742 | if (field) | |
3743 | { | |
805f961c | 3744 | char *name; |
281ec92f | 3745 | tree t; |
805f961c | 3746 | |
400fbf9f JW |
3747 | if (pedantic) |
3748 | pedwarn ("ANSI C forbids casts to union type"); | |
805f961c RS |
3749 | if (TYPE_NAME (type) != 0) |
3750 | { | |
3751 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
3752 | name = IDENTIFIER_POINTER (TYPE_NAME (type)); | |
3753 | else | |
3754 | name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
3755 | } | |
3756 | else | |
3757 | name = ""; | |
281ec92f RS |
3758 | t = digest_init (type, build (CONSTRUCTOR, type, NULL_TREE, |
3759 | build_tree_list (field, value)), | |
3760 | 0, 0); | |
3761 | TREE_CONSTANT (t) = TREE_CONSTANT (value); | |
3762 | return t; | |
400fbf9f JW |
3763 | } |
3764 | error ("cast to union type from type not present in union"); | |
3765 | return error_mark_node; | |
3766 | } | |
3767 | else | |
3768 | { | |
10d5caec | 3769 | tree otype, ovalue; |
53b01f59 RS |
3770 | |
3771 | /* If casting to void, avoid the error that would come | |
3772 | from default_conversion in the case of a non-lvalue array. */ | |
3773 | if (type == void_type_node) | |
3774 | return build1 (CONVERT_EXPR, type, value); | |
3775 | ||
400fbf9f JW |
3776 | /* Convert functions and arrays to pointers, |
3777 | but don't convert any other types. */ | |
3778 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
3779 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE) | |
3780 | value = default_conversion (value); | |
3781 | otype = TREE_TYPE (value); | |
3782 | ||
d45cf215 | 3783 | /* Optionally warn about potentially worrisome casts. */ |
400fbf9f JW |
3784 | |
3785 | if (warn_cast_qual | |
3786 | && TREE_CODE (type) == POINTER_TYPE | |
3787 | && TREE_CODE (otype) == POINTER_TYPE) | |
3788 | { | |
3789 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
3790 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
3791 | pedwarn ("cast discards `volatile' from pointer target type"); | |
3792 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
3793 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
3794 | pedwarn ("cast discards `const' from pointer target type"); | |
3795 | } | |
3796 | ||
3797 | /* Warn about possible alignment problems. */ | |
d45cf215 | 3798 | if (STRICT_ALIGNMENT && warn_cast_align |
400fbf9f JW |
3799 | && TREE_CODE (type) == POINTER_TYPE |
3800 | && TREE_CODE (otype) == POINTER_TYPE | |
3801 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3802 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
ec9aa895 RK |
3803 | /* Don't warn about opaque types, where the actual alignment |
3804 | restriction is unknown. */ | |
3805 | && !((TREE_CODE (TREE_TYPE (otype)) == UNION_TYPE | |
3806 | || TREE_CODE (TREE_TYPE (otype)) == RECORD_TYPE) | |
3807 | && TYPE_MODE (TREE_TYPE (otype)) == VOIDmode) | |
400fbf9f JW |
3808 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) |
3809 | warning ("cast increases required alignment of target type"); | |
400fbf9f JW |
3810 | |
3811 | if (TREE_CODE (type) == INTEGER_TYPE | |
3812 | && TREE_CODE (otype) == POINTER_TYPE | |
c9b7f31c RS |
3813 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
3814 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3815 | warning ("cast from pointer to integer of different size"); |
3816 | ||
796bb373 RK |
3817 | if (warn_bad_function_cast |
3818 | && TREE_CODE (value) == CALL_EXPR | |
3819 | && TREE_CODE (type) != TREE_CODE (otype)) | |
3820 | warning ("cast does not match function type"); | |
3821 | ||
400fbf9f JW |
3822 | if (TREE_CODE (type) == POINTER_TYPE |
3823 | && TREE_CODE (otype) == INTEGER_TYPE | |
2918ed3c | 3824 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
c9b7f31c | 3825 | #if 0 |
2918ed3c RS |
3826 | /* Don't warn about converting 0 to pointer, |
3827 | provided the 0 was explicit--not cast or made by folding. */ | |
c9b7f31c RS |
3828 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value)) |
3829 | #endif | |
3830 | /* Don't warn about converting any constant. */ | |
3831 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3832 | warning ("cast to pointer from integer of different size"); |
3833 | ||
10d5caec | 3834 | ovalue = value; |
400fbf9f | 3835 | value = convert (type, value); |
e58cd767 RS |
3836 | |
3837 | /* Ignore any integer overflow caused by the cast. */ | |
3838 | if (TREE_CODE (value) == INTEGER_CST) | |
10d5caec PE |
3839 | { |
3840 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
3841 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
3842 | } | |
400fbf9f JW |
3843 | } |
3844 | ||
fd5d5b94 RS |
3845 | /* Pedantically, don't ley (void *) (FOO *) 0 be a null pointer constant. */ |
3846 | if (pedantic && TREE_CODE (value) == INTEGER_CST | |
3847 | && TREE_CODE (expr) == INTEGER_CST | |
3848 | && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE) | |
3849 | value = non_lvalue (value); | |
3850 | ||
3851 | /* If pedantic, don't let a cast be an lvalue. */ | |
400fbf9f | 3852 | if (value == expr && pedantic) |
fd5d5b94 RS |
3853 | value = non_lvalue (value); |
3854 | ||
400fbf9f JW |
3855 | return value; |
3856 | } | |
3857 | \f | |
3858 | /* Build an assignment expression of lvalue LHS from value RHS. | |
3859 | MODIFYCODE is the code for a binary operator that we use | |
3860 | to combine the old value of LHS with RHS to get the new value. | |
3861 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
3862 | ||
3863 | tree | |
3864 | build_modify_expr (lhs, modifycode, rhs) | |
3865 | tree lhs, rhs; | |
3866 | enum tree_code modifycode; | |
3867 | { | |
3868 | register tree result; | |
3869 | tree newrhs; | |
3870 | tree lhstype = TREE_TYPE (lhs); | |
3871 | tree olhstype = lhstype; | |
3872 | ||
3873 | /* Types that aren't fully specified cannot be used in assignments. */ | |
3874 | lhs = require_complete_type (lhs); | |
3875 | ||
3876 | /* Avoid duplicate error messages from operands that had errors. */ | |
3877 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
3878 | return error_mark_node; | |
3879 | ||
3880 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
3881 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
3882 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
3883 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
3884 | rhs = TREE_OPERAND (rhs, 0); | |
3885 | ||
3886 | newrhs = rhs; | |
3887 | ||
3888 | /* Handle control structure constructs used as "lvalues". */ | |
3889 | ||
3890 | switch (TREE_CODE (lhs)) | |
3891 | { | |
3892 | /* Handle (a, b) used as an "lvalue". */ | |
3893 | case COMPOUND_EXPR: | |
3894 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
19d76e60 RK |
3895 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), |
3896 | modifycode, rhs); | |
3897 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
3898 | return error_mark_node; | |
400fbf9f | 3899 | return build (COMPOUND_EXPR, lhstype, |
19d76e60 RK |
3900 | TREE_OPERAND (lhs, 0), newrhs); |
3901 | ||
400fbf9f JW |
3902 | /* Handle (a ? b : c) used as an "lvalue". */ |
3903 | case COND_EXPR: | |
3904 | pedantic_lvalue_warning (COND_EXPR); | |
3905 | rhs = save_expr (rhs); | |
3906 | { | |
3907 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
3908 | except that the RHS goes through a save-expr | |
3909 | so the code to compute it is only emitted once. */ | |
3910 | tree cond | |
3911 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
3912 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
3913 | modifycode, rhs), | |
3914 | build_modify_expr (TREE_OPERAND (lhs, 2), | |
3915 | modifycode, rhs)); | |
19d76e60 RK |
3916 | if (TREE_CODE (cond) == ERROR_MARK) |
3917 | return cond; | |
400fbf9f JW |
3918 | /* Make sure the code to compute the rhs comes out |
3919 | before the split. */ | |
3920 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
3921 | /* But cast it to void to avoid an "unused" error. */ | |
3922 | convert (void_type_node, rhs), cond); | |
3923 | } | |
e9a25f70 JL |
3924 | default: |
3925 | break; | |
400fbf9f JW |
3926 | } |
3927 | ||
3928 | /* If a binary op has been requested, combine the old LHS value with the RHS | |
3929 | producing the value we should actually store into the LHS. */ | |
3930 | ||
3931 | if (modifycode != NOP_EXPR) | |
3932 | { | |
3933 | lhs = stabilize_reference (lhs); | |
3934 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
3935 | } | |
3936 | ||
3937 | /* Handle a cast used as an "lvalue". | |
3938 | We have already performed any binary operator using the value as cast. | |
3939 | Now convert the result to the cast type of the lhs, | |
3940 | and then true type of the lhs and store it there; | |
3941 | then convert result back to the cast type to be the value | |
3942 | of the assignment. */ | |
3943 | ||
3944 | switch (TREE_CODE (lhs)) | |
3945 | { | |
3946 | case NOP_EXPR: | |
3947 | case CONVERT_EXPR: | |
3948 | case FLOAT_EXPR: | |
3949 | case FIX_TRUNC_EXPR: | |
3950 | case FIX_FLOOR_EXPR: | |
3951 | case FIX_ROUND_EXPR: | |
3952 | case FIX_CEIL_EXPR: | |
3953 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
3954 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE) | |
3955 | newrhs = default_conversion (newrhs); | |
3956 | { | |
3957 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
3958 | tree result; | |
3959 | result = build_modify_expr (inner_lhs, NOP_EXPR, | |
3960 | convert (TREE_TYPE (inner_lhs), | |
3961 | convert (lhstype, newrhs))); | |
19d76e60 RK |
3962 | if (TREE_CODE (result) == ERROR_MARK) |
3963 | return result; | |
400fbf9f JW |
3964 | pedantic_lvalue_warning (CONVERT_EXPR); |
3965 | return convert (TREE_TYPE (lhs), result); | |
3966 | } | |
e9a25f70 JL |
3967 | |
3968 | default: | |
3969 | break; | |
400fbf9f JW |
3970 | } |
3971 | ||
3972 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
3973 | Reject anything strange now. */ | |
3974 | ||
3975 | if (!lvalue_or_else (lhs, "assignment")) | |
3976 | return error_mark_node; | |
3977 | ||
3978 | /* Warn about storing in something that is `const'. */ | |
3979 | ||
3980 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
3981 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
3982 | || TREE_CODE (lhstype) == UNION_TYPE) | |
3983 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
3984 | readonly_warning (lhs, "assignment"); | |
3985 | ||
3986 | /* If storing into a structure or union member, | |
3987 | it has probably been given type `int'. | |
3988 | Compute the type that would go with | |
3989 | the actual amount of storage the member occupies. */ | |
3990 | ||
3991 | if (TREE_CODE (lhs) == COMPONENT_REF | |
3992 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
3993 | || TREE_CODE (lhstype) == REAL_TYPE | |
3994 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
3995 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
3996 | ||
3997 | /* If storing in a field that is in actuality a short or narrower than one, | |
3998 | we must store in the field in its actual type. */ | |
3999 | ||
4000 | if (lhstype != TREE_TYPE (lhs)) | |
4001 | { | |
4002 | lhs = copy_node (lhs); | |
4003 | TREE_TYPE (lhs) = lhstype; | |
4004 | } | |
4005 | ||
4006 | /* Convert new value to destination type. */ | |
4007 | ||
4008 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
9b7267b8 | 4009 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
4010 | if (TREE_CODE (newrhs) == ERROR_MARK) |
4011 | return error_mark_node; | |
4012 | ||
4013 | result = build (MODIFY_EXPR, lhstype, lhs, newrhs); | |
4014 | TREE_SIDE_EFFECTS (result) = 1; | |
4015 | ||
4016 | /* If we got the LHS in a different type for storing in, | |
4017 | convert the result back to the nominal type of LHS | |
4018 | so that the value we return always has the same type | |
4019 | as the LHS argument. */ | |
4020 | ||
4021 | if (olhstype == TREE_TYPE (result)) | |
4022 | return result; | |
9b7267b8 RS |
4023 | return convert_for_assignment (olhstype, result, "assignment", |
4024 | NULL_TREE, NULL_TREE, 0); | |
400fbf9f JW |
4025 | } |
4026 | \f | |
4027 | /* Convert value RHS to type TYPE as preparation for an assignment | |
4028 | to an lvalue of type TYPE. | |
4029 | The real work of conversion is done by `convert'. | |
4030 | The purpose of this function is to generate error messages | |
4031 | for assignments that are not allowed in C. | |
4032 | ERRTYPE is a string to use in error messages: | |
4033 | "assignment", "return", etc. If it is null, this is parameter passing | |
d45cf215 RS |
4034 | for a function call (and different error messages are output). Otherwise, |
4035 | it may be a name stored in the spelling stack and interpreted by | |
4036 | get_spelling. | |
400fbf9f JW |
4037 | |
4038 | FUNNAME is the name of the function being called, | |
4039 | as an IDENTIFIER_NODE, or null. | |
4040 | PARMNUM is the number of the argument, for printing in error messages. */ | |
4041 | ||
4042 | static tree | |
9b7267b8 | 4043 | convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum) |
400fbf9f JW |
4044 | tree type, rhs; |
4045 | char *errtype; | |
9b7267b8 | 4046 | tree fundecl, funname; |
400fbf9f JW |
4047 | int parmnum; |
4048 | { | |
4049 | register enum tree_code codel = TREE_CODE (type); | |
4050 | register tree rhstype; | |
4051 | register enum tree_code coder; | |
4052 | ||
4053 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4054 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4055 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
4056 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
4057 | rhs = TREE_OPERAND (rhs, 0); | |
4058 | ||
4059 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
4060 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE) | |
4061 | rhs = default_conversion (rhs); | |
8c3a6477 RK |
4062 | else if (optimize && TREE_CODE (rhs) == VAR_DECL) |
4063 | rhs = decl_constant_value (rhs); | |
400fbf9f JW |
4064 | |
4065 | rhstype = TREE_TYPE (rhs); | |
4066 | coder = TREE_CODE (rhstype); | |
4067 | ||
4068 | if (coder == ERROR_MARK) | |
4069 | return error_mark_node; | |
4070 | ||
4071 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
e58cd767 RS |
4072 | { |
4073 | overflow_warning (rhs); | |
8b40563c TW |
4074 | /* Check for Objective-C protocols. This will issue a warning if |
4075 | there are protocol violations. No need to use the return value. */ | |
4076 | maybe_objc_comptypes (type, rhstype, 0); | |
e58cd767 RS |
4077 | return rhs; |
4078 | } | |
400fbf9f JW |
4079 | |
4080 | if (coder == VOID_TYPE) | |
4081 | { | |
4082 | error ("void value not ignored as it ought to be"); | |
4083 | return error_mark_node; | |
4084 | } | |
4085 | /* Arithmetic types all interconvert, and enum is treated like int. */ | |
b6a10c9f RS |
4086 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == ENUMERAL_TYPE |
4087 | || codel == COMPLEX_TYPE) | |
61179109 RK |
4088 | && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == ENUMERAL_TYPE |
4089 | || coder == COMPLEX_TYPE)) | |
da3c6115 | 4090 | return convert_and_check (type, rhs); |
61179109 | 4091 | |
7e842ef8 PE |
4092 | /* Conversion to a transparent union from its member types. |
4093 | This applies only to function arguments. */ | |
4094 | else if (codel == UNION_TYPE && TYPE_TRANSPARENT_UNION (type) && ! errtype) | |
4095 | { | |
4096 | tree memb_types; | |
4097 | tree marginal_memb_type = 0; | |
4098 | ||
4099 | for (memb_types = TYPE_FIELDS (type); memb_types; | |
4100 | memb_types = TREE_CHAIN (memb_types)) | |
4101 | { | |
4102 | tree memb_type = TREE_TYPE (memb_types); | |
4103 | ||
4104 | if (comptypes (TYPE_MAIN_VARIANT (memb_type), | |
4105 | TYPE_MAIN_VARIANT (rhstype))) | |
4106 | break; | |
4107 | ||
4108 | if (TREE_CODE (memb_type) != POINTER_TYPE) | |
4109 | continue; | |
4110 | ||
4111 | if (coder == POINTER_TYPE) | |
4112 | { | |
4113 | register tree ttl = TREE_TYPE (memb_type); | |
4114 | register tree ttr = TREE_TYPE (rhstype); | |
4115 | ||
4116 | /* Any non-function converts to a [const][volatile] void * | |
4117 | and vice versa; otherwise, targets must be the same. | |
4118 | Meanwhile, the lhs target must have all the qualifiers of | |
4119 | the rhs. */ | |
4120 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4121 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4122 | || comp_target_types (memb_type, rhstype)) | |
4123 | { | |
4124 | /* If this type won't generate any warnings, use it. */ | |
4125 | if ((TREE_CODE (ttr) == FUNCTION_TYPE | |
4126 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4127 | ? ((! TYPE_READONLY (ttl) | TYPE_READONLY (ttr)) | |
4128 | & (! TYPE_VOLATILE (ttl) | TYPE_VOLATILE (ttr))) | |
4129 | : ((TYPE_READONLY (ttl) | ! TYPE_READONLY (ttr)) | |
4130 | & (TYPE_VOLATILE (ttl) | ! TYPE_VOLATILE (ttr)))) | |
4131 | break; | |
4132 | ||
4133 | /* Keep looking for a better type, but remember this one. */ | |
4134 | if (! marginal_memb_type) | |
4135 | marginal_memb_type = memb_type; | |
4136 | } | |
4137 | } | |
4138 | ||
4139 | /* Can convert integer zero to any pointer type. */ | |
4140 | if (integer_zerop (rhs) | |
4141 | || (TREE_CODE (rhs) == NOP_EXPR | |
4142 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
4143 | { | |
4144 | rhs = null_pointer_node; | |
4145 | break; | |
4146 | } | |
4147 | } | |
4148 | ||
4149 | if (memb_types || marginal_memb_type) | |
4150 | { | |
4151 | if (! memb_types) | |
4152 | { | |
4153 | /* We have only a marginally acceptable member type; | |
0f41302f | 4154 | it needs a warning. */ |
7e842ef8 PE |
4155 | register tree ttl = TREE_TYPE (marginal_memb_type); |
4156 | register tree ttr = TREE_TYPE (rhstype); | |
4157 | ||
4158 | /* Const and volatile mean something different for function | |
4159 | types, so the usual warnings are not appropriate. */ | |
4160 | if (TREE_CODE (ttr) == FUNCTION_TYPE | |
4161 | && TREE_CODE (ttl) == FUNCTION_TYPE) | |
4162 | { | |
4163 | /* Because const and volatile on functions are | |
4164 | restrictions that say the function will not do | |
4165 | certain things, it is okay to use a const or volatile | |
4166 | function where an ordinary one is wanted, but not | |
4167 | vice-versa. */ | |
4168 | if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr)) | |
4169 | warn_for_assignment ("%s makes `const *' function pointer from non-const", | |
4170 | get_spelling (errtype), funname, | |
4171 | parmnum); | |
4172 | if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr)) | |
4173 | warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile", | |
4174 | get_spelling (errtype), funname, | |
4175 | parmnum); | |
4176 | } | |
4177 | else | |
4178 | { | |
4179 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
4180 | warn_for_assignment ("%s discards `const' from pointer target type", | |
4181 | get_spelling (errtype), funname, | |
4182 | parmnum); | |
4183 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) | |
4184 | warn_for_assignment ("%s discards `volatile' from pointer target type", | |
4185 | get_spelling (errtype), funname, | |
4186 | parmnum); | |
4187 | } | |
4188 | } | |
4189 | ||
4190 | if (pedantic && ! DECL_IN_SYSTEM_HEADER (fundecl)) | |
4191 | pedwarn ("ANSI C prohibits argument conversion to union type"); | |
4192 | ||
4193 | return build1 (NOP_EXPR, type, rhs); | |
4194 | } | |
4195 | } | |
4196 | ||
400fbf9f JW |
4197 | /* Conversions among pointers */ |
4198 | else if (codel == POINTER_TYPE && coder == POINTER_TYPE) | |
4199 | { | |
4200 | register tree ttl = TREE_TYPE (type); | |
4201 | register tree ttr = TREE_TYPE (rhstype); | |
4202 | ||
4203 | /* Any non-function converts to a [const][volatile] void * | |
4204 | and vice versa; otherwise, targets must be the same. | |
4205 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
4206 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4207 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
790e9490 RS |
4208 | || comp_target_types (type, rhstype) |
4209 | || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) | |
4210 | == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
400fbf9f JW |
4211 | { |
4212 | if (pedantic | |
4213 | && ((TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4214 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
4215 | || | |
4216 | (TYPE_MAIN_VARIANT (ttr) == void_type_node | |
fd5d5b94 RS |
4217 | /* Check TREE_CODE to catch cases like (void *) (char *) 0 |
4218 | which are not ANSI null ptr constants. */ | |
4219 | && (!integer_zerop (rhs) || TREE_CODE (rhs) == NOP_EXPR) | |
400fbf9f JW |
4220 | && TREE_CODE (ttl) == FUNCTION_TYPE))) |
4221 | warn_for_assignment ("ANSI forbids %s between function pointer and `void *'", | |
d45cf215 | 4222 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4223 | /* Const and volatile mean something different for function types, |
4224 | so the usual warnings are not appropriate. */ | |
4225 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
caf2e8e4 | 4226 | && TREE_CODE (ttl) != FUNCTION_TYPE) |
400fbf9f JW |
4227 | { |
4228 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
4229 | warn_for_assignment ("%s discards `const' from pointer target type", | |
d45cf215 | 4230 | get_spelling (errtype), funname, parmnum); |
790e9490 | 4231 | else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
400fbf9f | 4232 | warn_for_assignment ("%s discards `volatile' from pointer target type", |
d45cf215 | 4233 | get_spelling (errtype), funname, parmnum); |
790e9490 RS |
4234 | /* If this is not a case of ignoring a mismatch in signedness, |
4235 | no warning. */ | |
4236 | else if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4237 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4238 | || comp_target_types (type, rhstype)) | |
4239 | ; | |
4240 | /* If there is a mismatch, do warn. */ | |
4241 | else if (pedantic) | |
4242 | warn_for_assignment ("pointer targets in %s differ in signedness", | |
4243 | get_spelling (errtype), funname, parmnum); | |
400fbf9f | 4244 | } |
d949d5df RK |
4245 | else if (TREE_CODE (ttl) == FUNCTION_TYPE |
4246 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
400fbf9f JW |
4247 | { |
4248 | /* Because const and volatile on functions are restrictions | |
4249 | that say the function will not do certain things, | |
4250 | it is okay to use a const or volatile function | |
4251 | where an ordinary one is wanted, but not vice-versa. */ | |
4252 | if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr)) | |
4253 | warn_for_assignment ("%s makes `const *' function pointer from non-const", | |
d45cf215 | 4254 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4255 | if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr)) |
4256 | warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile", | |
d45cf215 | 4257 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4258 | } |
4259 | } | |
400fbf9f JW |
4260 | else |
4261 | warn_for_assignment ("%s from incompatible pointer type", | |
d45cf215 | 4262 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4263 | return convert (type, rhs); |
4264 | } | |
4265 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
4266 | { | |
2918ed3c | 4267 | /* An explicit constant 0 can convert to a pointer, |
f1a2b955 RS |
4268 | or one that results from arithmetic, even including |
4269 | a cast to integer type. */ | |
4270 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs)) | |
4271 | && | |
4272 | ! (TREE_CODE (rhs) == NOP_EXPR | |
4273 | && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE | |
4274 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == INTEGER_CST | |
4275 | && integer_zerop (TREE_OPERAND (rhs, 0)))) | |
400fbf9f JW |
4276 | { |
4277 | warn_for_assignment ("%s makes pointer from integer without a cast", | |
d45cf215 | 4278 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4279 | return convert (type, rhs); |
4280 | } | |
4281 | return null_pointer_node; | |
4282 | } | |
4283 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) | |
4284 | { | |
4285 | warn_for_assignment ("%s makes integer from pointer without a cast", | |
d45cf215 | 4286 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4287 | return convert (type, rhs); |
4288 | } | |
4289 | ||
4290 | if (!errtype) | |
4291 | { | |
4292 | if (funname) | |
8b40563c TW |
4293 | { |
4294 | tree selector = maybe_building_objc_message_expr (); | |
4295 | ||
4296 | if (selector && parmnum > 2) | |
4297 | error ("incompatible type for argument %d of `%s'", | |
4298 | parmnum - 2, IDENTIFIER_POINTER (selector)); | |
4299 | else | |
4300 | error ("incompatible type for argument %d of `%s'", | |
4301 | parmnum, IDENTIFIER_POINTER (funname)); | |
4302 | } | |
400fbf9f JW |
4303 | else |
4304 | error ("incompatible type for argument %d of indirect function call", | |
4305 | parmnum); | |
4306 | } | |
4307 | else | |
d45cf215 | 4308 | error ("incompatible types in %s", get_spelling (errtype)); |
400fbf9f JW |
4309 | |
4310 | return error_mark_node; | |
4311 | } | |
4312 | ||
4313 | /* Print a warning using MSG. | |
4314 | It gets OPNAME as its one parameter. | |
4315 | If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'". | |
4316 | FUNCTION and ARGNUM are handled specially if we are building an | |
4317 | Objective-C selector. */ | |
4318 | ||
4319 | static void | |
4320 | warn_for_assignment (msg, opname, function, argnum) | |
4321 | char *msg; | |
4322 | char *opname; | |
4323 | tree function; | |
4324 | int argnum; | |
4325 | { | |
4326 | static char argstring[] = "passing arg %d of `%s'"; | |
4327 | static char argnofun[] = "passing arg %d"; | |
4328 | ||
4329 | if (opname == 0) | |
4330 | { | |
4331 | tree selector = maybe_building_objc_message_expr (); | |
4332 | ||
4333 | if (selector && argnum > 2) | |
4334 | { | |
4335 | function = selector; | |
4336 | argnum -= 2; | |
4337 | } | |
4338 | if (function) | |
4339 | { | |
4340 | /* Function name is known; supply it. */ | |
4341 | opname = (char *) alloca (IDENTIFIER_LENGTH (function) | |
4342 | + sizeof (argstring) + 25 /*%d*/ + 1); | |
4343 | sprintf (opname, argstring, argnum, IDENTIFIER_POINTER (function)); | |
4344 | } | |
4345 | else | |
4346 | { | |
4347 | /* Function name unknown (call through ptr); just give arg number. */ | |
4348 | opname = (char *) alloca (sizeof (argnofun) + 25 /*%d*/ + 1); | |
4349 | sprintf (opname, argnofun, argnum); | |
4350 | } | |
4351 | } | |
4352 | pedwarn (msg, opname); | |
4353 | } | |
4354 | \f | |
4355 | /* Return nonzero if VALUE is a valid constant-valued expression | |
4356 | for use in initializing a static variable; one that can be an | |
4357 | element of a "constant" initializer. | |
4358 | ||
4359 | Return null_pointer_node if the value is absolute; | |
4360 | if it is relocatable, return the variable that determines the relocation. | |
4361 | We assume that VALUE has been folded as much as possible; | |
4362 | therefore, we do not need to check for such things as | |
4363 | arithmetic-combinations of integers. */ | |
4364 | ||
ca1f6b57 | 4365 | tree |
f0c70ef0 | 4366 | initializer_constant_valid_p (value, endtype) |
400fbf9f | 4367 | tree value; |
f0c70ef0 | 4368 | tree endtype; |
400fbf9f JW |
4369 | { |
4370 | switch (TREE_CODE (value)) | |
4371 | { | |
4372 | case CONSTRUCTOR: | |
977e6fb5 MM |
4373 | if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE |
4374 | || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE) | |
d6d22108 JL |
4375 | && TREE_CONSTANT (value) |
4376 | && CONSTRUCTOR_ELTS (value)) | |
75ddf8b0 RK |
4377 | return |
4378 | initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)), | |
4379 | endtype); | |
281ec92f | 4380 | |
400fbf9f JW |
4381 | return TREE_STATIC (value) ? null_pointer_node : 0; |
4382 | ||
4383 | case INTEGER_CST: | |
4384 | case REAL_CST: | |
4385 | case STRING_CST: | |
466e9220 | 4386 | case COMPLEX_CST: |
400fbf9f JW |
4387 | return null_pointer_node; |
4388 | ||
4389 | case ADDR_EXPR: | |
4390 | return TREE_OPERAND (value, 0); | |
4391 | ||
4392 | case NON_LVALUE_EXPR: | |
f0c70ef0 | 4393 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4394 | |
4395 | case CONVERT_EXPR: | |
4396 | case NOP_EXPR: | |
4397 | /* Allow conversions between pointer types. */ | |
4398 | if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE | |
4399 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE) | |
f0c70ef0 | 4400 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
9c4dcbc7 | 4401 | |
400fbf9f JW |
4402 | /* Allow conversions between real types. */ |
4403 | if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE | |
4404 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE) | |
f0c70ef0 | 4405 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
9c4dcbc7 | 4406 | |
400fbf9f JW |
4407 | /* Allow length-preserving conversions between integer types. */ |
4408 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE | |
4409 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE | |
9c4dcbc7 RK |
4410 | && (TYPE_PRECISION (TREE_TYPE (value)) |
4411 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 | 4412 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
9c4dcbc7 RK |
4413 | |
4414 | /* Allow conversions between other integer types only if | |
4415 | explicit value. */ | |
400fbf9f JW |
4416 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE |
4417 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE) | |
4418 | { | |
f0c70ef0 RS |
4419 | tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4420 | endtype); | |
400fbf9f JW |
4421 | if (inner == null_pointer_node) |
4422 | return null_pointer_node; | |
4423 | return 0; | |
4424 | } | |
9c4dcbc7 | 4425 | |
9b7267b8 | 4426 | /* Allow (int) &foo provided int is as wide as a pointer. */ |
400fbf9f JW |
4427 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE |
4428 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE | |
9c4dcbc7 RK |
4429 | && (TYPE_PRECISION (TREE_TYPE (value)) |
4430 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
4431 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), | |
4432 | endtype); | |
4433 | ||
4434 | /* Likewise conversions from int to pointers. */ | |
4435 | if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE | |
4436 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE | |
4437 | && (TYPE_PRECISION (TREE_TYPE (value)) | |
4438 | <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 RS |
4439 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4440 | endtype); | |
9c4dcbc7 | 4441 | |
805f961c RS |
4442 | /* Allow conversions to union types if the value inside is okay. */ |
4443 | if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE) | |
f0c70ef0 RS |
4444 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4445 | endtype); | |
400fbf9f JW |
4446 | return 0; |
4447 | ||
4448 | case PLUS_EXPR: | |
1bbe9280 RS |
4449 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4450 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4451 | return 0; |
400fbf9f | 4452 | { |
f0c70ef0 RS |
4453 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4454 | endtype); | |
4455 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4456 | endtype); | |
400fbf9f JW |
4457 | /* If either term is absolute, use the other terms relocation. */ |
4458 | if (valid0 == null_pointer_node) | |
4459 | return valid1; | |
4460 | if (valid1 == null_pointer_node) | |
4461 | return valid0; | |
4462 | return 0; | |
4463 | } | |
4464 | ||
4465 | case MINUS_EXPR: | |
1bbe9280 RS |
4466 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4467 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4468 | return 0; |
400fbf9f | 4469 | { |
f0c70ef0 RS |
4470 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4471 | endtype); | |
4472 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4473 | endtype); | |
400fbf9f JW |
4474 | /* Win if second argument is absolute. */ |
4475 | if (valid1 == null_pointer_node) | |
4476 | return valid0; | |
4477 | /* Win if both arguments have the same relocation. | |
4478 | Then the value is absolute. */ | |
4479 | if (valid0 == valid1) | |
4480 | return null_pointer_node; | |
4481 | return 0; | |
4482 | } | |
400fbf9f | 4483 | |
e9a25f70 JL |
4484 | default: |
4485 | return 0; | |
4486 | } | |
400fbf9f | 4487 | } |
d9fc6069 JW |
4488 | |
4489 | /* If VALUE is a compound expr all of whose expressions are constant, then | |
4490 | return its value. Otherwise, return error_mark_node. | |
4491 | ||
4492 | This is for handling COMPOUND_EXPRs as initializer elements | |
4493 | which is allowed with a warning when -pedantic is specified. */ | |
4494 | ||
4495 | static tree | |
4496 | valid_compound_expr_initializer (value, endtype) | |
4497 | tree value; | |
4498 | tree endtype; | |
4499 | { | |
4500 | if (TREE_CODE (value) == COMPOUND_EXPR) | |
4501 | { | |
4502 | if (valid_compound_expr_initializer (TREE_OPERAND (value, 0), endtype) | |
4503 | == error_mark_node) | |
4504 | return error_mark_node; | |
4505 | return valid_compound_expr_initializer (TREE_OPERAND (value, 1), | |
4506 | endtype); | |
4507 | } | |
4508 | else if (! TREE_CONSTANT (value) | |
4509 | && ! initializer_constant_valid_p (value, endtype)) | |
4510 | return error_mark_node; | |
4511 | else | |
4512 | return value; | |
4513 | } | |
400fbf9f JW |
4514 | \f |
4515 | /* Perform appropriate conversions on the initial value of a variable, | |
4516 | store it in the declaration DECL, | |
4517 | and print any error messages that are appropriate. | |
4518 | If the init is invalid, store an ERROR_MARK. */ | |
4519 | ||
4520 | void | |
4521 | store_init_value (decl, init) | |
4522 | tree decl, init; | |
4523 | { | |
4524 | register tree value, type; | |
4525 | ||
4526 | /* If variable's type was invalidly declared, just ignore it. */ | |
4527 | ||
4528 | type = TREE_TYPE (decl); | |
4529 | if (TREE_CODE (type) == ERROR_MARK) | |
4530 | return; | |
4531 | ||
4532 | /* Digest the specified initializer into an expression. */ | |
4533 | ||
790e9490 RS |
4534 | value = digest_init (type, init, TREE_STATIC (decl), |
4535 | TREE_STATIC (decl) || pedantic); | |
400fbf9f JW |
4536 | |
4537 | /* Store the expression if valid; else report error. */ | |
4538 | ||
4539 | #if 0 | |
4540 | /* Note that this is the only place we can detect the error | |
4541 | in a case such as struct foo bar = (struct foo) { x, y }; | |
d45cf215 | 4542 | where there is one initial value which is a constructor expression. */ |
400fbf9f JW |
4543 | if (value == error_mark_node) |
4544 | ; | |
4545 | else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value)) | |
4546 | { | |
4547 | error ("initializer for static variable is not constant"); | |
4548 | value = error_mark_node; | |
4549 | } | |
4550 | else if (TREE_STATIC (decl) | |
f0c70ef0 | 4551 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) |
400fbf9f JW |
4552 | { |
4553 | error ("initializer for static variable uses complicated arithmetic"); | |
4554 | value = error_mark_node; | |
4555 | } | |
4556 | else | |
4557 | { | |
4558 | if (pedantic && TREE_CODE (value) == CONSTRUCTOR) | |
4559 | { | |
4560 | if (! TREE_CONSTANT (value)) | |
4561 | pedwarn ("aggregate initializer is not constant"); | |
4562 | else if (! TREE_STATIC (value)) | |
4563 | pedwarn ("aggregate initializer uses complicated arithmetic"); | |
4564 | } | |
4565 | } | |
4566 | #endif | |
4567 | ||
10d5caec PE |
4568 | DECL_INITIAL (decl) = value; |
4569 | ||
26b3c423 | 4570 | /* ANSI wants warnings about out-of-range constant initializers. */ |
10d5caec | 4571 | STRIP_TYPE_NOPS (value); |
26b3c423 | 4572 | constant_expression_warning (value); |
400fbf9f JW |
4573 | } |
4574 | \f | |
075fc632 | 4575 | /* Methods for storing and printing names for error messages. */ |
d45cf215 RS |
4576 | |
4577 | /* Implement a spelling stack that allows components of a name to be pushed | |
4578 | and popped. Each element on the stack is this structure. */ | |
4579 | ||
4580 | struct spelling | |
4581 | { | |
4582 | int kind; | |
4583 | union | |
4584 | { | |
4585 | int i; | |
4586 | char *s; | |
4587 | } u; | |
4588 | }; | |
4589 | ||
4590 | #define SPELLING_STRING 1 | |
4591 | #define SPELLING_MEMBER 2 | |
4592 | #define SPELLING_BOUNDS 3 | |
4593 | ||
4594 | static struct spelling *spelling; /* Next stack element (unused). */ | |
4595 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4596 | static int spelling_size; /* Size of the spelling stack. */ | |
4597 | ||
4598 | /* Macros to save and restore the spelling stack around push_... functions. | |
4599 | Alternative to SAVE_SPELLING_STACK. */ | |
4600 | ||
4601 | #define SPELLING_DEPTH() (spelling - spelling_base) | |
4602 | #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth) | |
4603 | ||
4604 | /* Save and restore the spelling stack around arbitrary C code. */ | |
4605 | ||
4606 | #define SAVE_SPELLING_DEPTH(code) \ | |
4607 | { \ | |
4608 | int __depth = SPELLING_DEPTH (); \ | |
4609 | code; \ | |
4610 | RESTORE_SPELLING_DEPTH (__depth); \ | |
4611 | } | |
4612 | ||
4613 | /* Push an element on the spelling stack with type KIND and assign VALUE | |
4614 | to MEMBER. */ | |
4615 | ||
4616 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ | |
4617 | { \ | |
4618 | int depth = SPELLING_DEPTH (); \ | |
4619 | \ | |
4620 | if (depth >= spelling_size) \ | |
4621 | { \ | |
4622 | spelling_size += 10; \ | |
4623 | if (spelling_base == 0) \ | |
4624 | spelling_base \ | |
4625 | = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \ | |
4626 | else \ | |
4627 | spelling_base \ | |
4628 | = (struct spelling *) xrealloc (spelling_base, \ | |
4629 | spelling_size * sizeof (struct spelling)); \ | |
4630 | RESTORE_SPELLING_DEPTH (depth); \ | |
4631 | } \ | |
4632 | \ | |
4633 | spelling->kind = (KIND); \ | |
4634 | spelling->MEMBER = (VALUE); \ | |
4635 | spelling++; \ | |
4636 | } | |
4637 | ||
4638 | /* Push STRING on the stack. Printed literally. */ | |
4639 | ||
4640 | static void | |
4641 | push_string (string) | |
4642 | char *string; | |
4643 | { | |
4644 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4645 | } | |
4646 | ||
4647 | /* Push a member name on the stack. Printed as '.' STRING. */ | |
4648 | ||
4649 | static void | |
19d76e60 RK |
4650 | push_member_name (decl) |
4651 | tree decl; | |
4652 | ||
d45cf215 | 4653 | { |
19d76e60 RK |
4654 | char *string |
4655 | = DECL_NAME (decl) ? IDENTIFIER_POINTER (DECL_NAME (decl)) : "<anonymous>"; | |
d45cf215 RS |
4656 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); |
4657 | } | |
4658 | ||
4659 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ | |
4660 | ||
4661 | static void | |
4662 | push_array_bounds (bounds) | |
4663 | int bounds; | |
4664 | { | |
4665 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4666 | } | |
4667 | ||
4668 | /* Compute the maximum size in bytes of the printed spelling. */ | |
4669 | ||
4670 | static int | |
4671 | spelling_length () | |
4672 | { | |
4673 | register int size = 0; | |
4674 | register struct spelling *p; | |
4675 | ||
4676 | for (p = spelling_base; p < spelling; p++) | |
4677 | { | |
4678 | if (p->kind == SPELLING_BOUNDS) | |
4679 | size += 25; | |
4680 | else | |
4681 | size += strlen (p->u.s) + 1; | |
4682 | } | |
4683 | ||
4684 | return size; | |
4685 | } | |
4686 | ||
4687 | /* Print the spelling to BUFFER and return it. */ | |
4688 | ||
4689 | static char * | |
4690 | print_spelling (buffer) | |
4691 | register char *buffer; | |
4692 | { | |
4693 | register char *d = buffer; | |
4694 | register char *s; | |
4695 | register struct spelling *p; | |
4696 | ||
4697 | for (p = spelling_base; p < spelling; p++) | |
4698 | if (p->kind == SPELLING_BOUNDS) | |
4699 | { | |
4700 | sprintf (d, "[%d]", p->u.i); | |
4701 | d += strlen (d); | |
4702 | } | |
4703 | else | |
4704 | { | |
4705 | if (p->kind == SPELLING_MEMBER) | |
4706 | *d++ = '.'; | |
1d300e19 | 4707 | for (s = p->u.s; (*d = *s++); d++) |
d45cf215 RS |
4708 | ; |
4709 | } | |
4710 | *d++ = '\0'; | |
4711 | return buffer; | |
4712 | } | |
4713 | ||
4714 | /* Provide a means to pass component names derived from the spelling stack. */ | |
4715 | ||
4716 | char initialization_message; | |
4717 | ||
4718 | /* Interpret the spelling of the given ERRTYPE message. */ | |
4719 | ||
4720 | static char * | |
4721 | get_spelling (errtype) | |
4722 | char *errtype; | |
4723 | { | |
4724 | static char *buffer; | |
4725 | static int size = -1; | |
4726 | ||
4727 | if (errtype == &initialization_message) | |
4728 | { | |
4729 | /* Avoid counting chars */ | |
4730 | static char message[] = "initialization of `%s'"; | |
4731 | register int needed = sizeof (message) + spelling_length () + 1; | |
047de90b | 4732 | char *temp; |
d45cf215 RS |
4733 | |
4734 | if (size < 0) | |
4735 | buffer = (char *) xmalloc (size = needed); | |
4736 | if (needed > size) | |
4737 | buffer = (char *) xrealloc (buffer, size = needed); | |
4738 | ||
047de90b RS |
4739 | temp = (char *) alloca (needed); |
4740 | sprintf (buffer, message, print_spelling (temp)); | |
d45cf215 RS |
4741 | return buffer; |
4742 | } | |
4743 | ||
4744 | return errtype; | |
4745 | } | |
4746 | ||
400fbf9f JW |
4747 | /* Issue an error message for a bad initializer component. |
4748 | FORMAT describes the message. OFWHAT is the name for the component. | |
4749 | LOCAL is a format string for formatting the insertion of the name | |
4750 | into the message. | |
4751 | ||
d45cf215 | 4752 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4753 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4754 | |
4755 | void | |
4756 | error_init (format, local, ofwhat) | |
4757 | char *format, *local, *ofwhat; | |
4758 | { | |
d45cf215 RS |
4759 | char *buffer; |
4760 | ||
4761 | if (ofwhat == 0) | |
73a424d3 | 4762 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
d45cf215 | 4763 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); |
400fbf9f JW |
4764 | |
4765 | if (*ofwhat) | |
4766 | sprintf (buffer, local, ofwhat); | |
4767 | else | |
4768 | buffer[0] = 0; | |
4769 | ||
4770 | error (format, buffer); | |
4771 | } | |
4772 | ||
4773 | /* Issue a pedantic warning for a bad initializer component. | |
4774 | FORMAT describes the message. OFWHAT is the name for the component. | |
4775 | LOCAL is a format string for formatting the insertion of the name | |
4776 | into the message. | |
4777 | ||
d45cf215 | 4778 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4779 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4780 | |
4781 | void | |
4782 | pedwarn_init (format, local, ofwhat) | |
4783 | char *format, *local, *ofwhat; | |
4784 | { | |
d45cf215 RS |
4785 | char *buffer; |
4786 | ||
4787 | if (ofwhat == 0) | |
73a424d3 | 4788 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
d45cf215 | 4789 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); |
400fbf9f JW |
4790 | |
4791 | if (*ofwhat) | |
4792 | sprintf (buffer, local, ofwhat); | |
4793 | else | |
4794 | buffer[0] = 0; | |
4795 | ||
4796 | pedwarn (format, buffer); | |
4797 | } | |
b71c7f8a RK |
4798 | |
4799 | /* Issue a warning for a bad initializer component. | |
4800 | FORMAT describes the message. OFWHAT is the name for the component. | |
4801 | LOCAL is a format string for formatting the insertion of the name | |
4802 | into the message. | |
4803 | ||
4804 | If OFWHAT is null, the component name is stored on the spelling stack. | |
4805 | If the component name is a null string, then LOCAL is omitted entirely. */ | |
4806 | ||
4807 | static void | |
4808 | warning_init (format, local, ofwhat) | |
4809 | char *format, *local, *ofwhat; | |
4810 | { | |
4811 | char *buffer; | |
4812 | ||
4813 | if (ofwhat == 0) | |
4814 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); | |
4815 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); | |
4816 | ||
4817 | if (*ofwhat) | |
4818 | sprintf (buffer, local, ofwhat); | |
4819 | else | |
4820 | buffer[0] = 0; | |
4821 | ||
4822 | warning (format, buffer); | |
4823 | } | |
400fbf9f JW |
4824 | \f |
4825 | /* Digest the parser output INIT as an initializer for type TYPE. | |
4826 | Return a C expression of type TYPE to represent the initial value. | |
4827 | ||
400fbf9f JW |
4828 | The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors |
4829 | if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT | |
59b22f64 | 4830 | applies only to elements of constructors. */ |
400fbf9f | 4831 | |
b62acd60 | 4832 | static tree |
790e9490 RS |
4833 | digest_init (type, init, require_constant, constructor_constant) |
4834 | tree type, init; | |
400fbf9f | 4835 | int require_constant, constructor_constant; |
400fbf9f JW |
4836 | { |
4837 | enum tree_code code = TREE_CODE (type); | |
047de90b | 4838 | tree inside_init = init; |
400fbf9f | 4839 | |
400fbf9f JW |
4840 | if (init == error_mark_node) |
4841 | return init; | |
4842 | ||
4843 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4844 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4845 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f | 4846 | if (TREE_CODE (init) == NON_LVALUE_EXPR) |
047de90b | 4847 | inside_init = TREE_OPERAND (init, 0); |
400fbf9f | 4848 | |
400fbf9f JW |
4849 | /* Initialization of an array of chars from a string constant |
4850 | optionally enclosed in braces. */ | |
4851 | ||
4852 | if (code == ARRAY_TYPE) | |
4853 | { | |
4854 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
4855 | if ((typ1 == char_type_node | |
4856 | || typ1 == signed_char_type_node | |
4857 | || typ1 == unsigned_char_type_node | |
4858 | || typ1 == unsigned_wchar_type_node | |
4859 | || typ1 == signed_wchar_type_node) | |
fd5d5b94 | 4860 | && ((inside_init && TREE_CODE (inside_init) == STRING_CST))) |
400fbf9f | 4861 | { |
4d65300e RS |
4862 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
4863 | TYPE_MAIN_VARIANT (type))) | |
fd5d5b94 | 4864 | return inside_init; |
d11fdb45 | 4865 | |
fd5d5b94 | 4866 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) |
400fbf9f JW |
4867 | != char_type_node) |
4868 | && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node)) | |
4869 | { | |
4870 | error_init ("char-array%s initialized from wide string", | |
de520661 | 4871 | " `%s'", NULL); |
400fbf9f JW |
4872 | return error_mark_node; |
4873 | } | |
fd5d5b94 | 4874 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (inside_init))) |
400fbf9f JW |
4875 | == char_type_node) |
4876 | && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)) | |
4877 | { | |
4878 | error_init ("int-array%s initialized from non-wide string", | |
de520661 | 4879 | " `%s'", NULL); |
400fbf9f JW |
4880 | return error_mark_node; |
4881 | } | |
4882 | ||
fd5d5b94 | 4883 | TREE_TYPE (inside_init) = type; |
400fbf9f JW |
4884 | if (TYPE_DOMAIN (type) != 0 |
4885 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
4886 | { | |
4887 | register int size = TREE_INT_CST_LOW (TYPE_SIZE (type)); | |
4888 | size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT; | |
fe9ef5d7 RS |
4889 | /* Subtract 1 (or sizeof (wchar_t)) |
4890 | because it's ok to ignore the terminating null char | |
400fbf9f | 4891 | that is counted in the length of the constant. */ |
fd5d5b94 | 4892 | if (size < TREE_STRING_LENGTH (inside_init) |
fe9ef5d7 RS |
4893 | - (TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node) |
4894 | ? TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT | |
4895 | : 1)) | |
400fbf9f JW |
4896 | pedwarn_init ( |
4897 | "initializer-string for array of chars%s is too long", | |
de520661 | 4898 | " `%s'", NULL); |
400fbf9f | 4899 | } |
fd5d5b94 | 4900 | return inside_init; |
400fbf9f JW |
4901 | } |
4902 | } | |
4903 | ||
de520661 RS |
4904 | /* Any type can be initialized |
4905 | from an expression of the same type, optionally with braces. */ | |
400fbf9f | 4906 | |
2726966d | 4907 | if (inside_init && TREE_TYPE (inside_init) != 0 |
5522c047 PB |
4908 | && (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)), |
4909 | TYPE_MAIN_VARIANT (type)) | |
2726966d | 4910 | || (code == ARRAY_TYPE |
3c3fa147 RS |
4911 | && comptypes (TREE_TYPE (inside_init), type)) |
4912 | || (code == POINTER_TYPE | |
3c3fa147 RS |
4913 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4914 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE) | |
4915 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), | |
4916 | TREE_TYPE (type))))) | |
400fbf9f JW |
4917 | { |
4918 | if (code == POINTER_TYPE | |
047de90b RS |
4919 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4920 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)) | |
4921 | inside_init = default_conversion (inside_init); | |
de520661 RS |
4922 | else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST |
4923 | && TREE_CODE (inside_init) != CONSTRUCTOR) | |
400fbf9f JW |
4924 | { |
4925 | error_init ("array%s initialized from non-constant array expression", | |
de520661 | 4926 | " `%s'", NULL); |
400fbf9f JW |
4927 | return error_mark_node; |
4928 | } | |
4929 | ||
8c3a6477 | 4930 | if (optimize && TREE_CODE (inside_init) == VAR_DECL) |
047de90b | 4931 | inside_init = decl_constant_value (inside_init); |
400fbf9f | 4932 | |
d9fc6069 JW |
4933 | /* Compound expressions can only occur here if -pedantic or |
4934 | -pedantic-errors is specified. In the later case, we always want | |
4935 | an error. In the former case, we simply want a warning. */ | |
4936 | if (require_constant && pedantic | |
4937 | && TREE_CODE (inside_init) == COMPOUND_EXPR) | |
4938 | { | |
4939 | inside_init | |
4940 | = valid_compound_expr_initializer (inside_init, | |
4941 | TREE_TYPE (inside_init)); | |
4942 | if (inside_init == error_mark_node) | |
4943 | error_init ("initializer element%s is not constant", | |
4944 | " for `%s'", NULL); | |
4945 | else | |
4946 | pedwarn_init ("initializer element%s is not constant", | |
4947 | " for `%s'", NULL); | |
4948 | if (flag_pedantic_errors) | |
4949 | inside_init = error_mark_node; | |
4950 | } | |
4951 | else if (require_constant && ! TREE_CONSTANT (inside_init)) | |
400fbf9f JW |
4952 | { |
4953 | error_init ("initializer element%s is not constant", | |
de520661 | 4954 | " for `%s'", NULL); |
047de90b | 4955 | inside_init = error_mark_node; |
400fbf9f | 4956 | } |
f0c70ef0 RS |
4957 | else if (require_constant |
4958 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
4959 | { |
4960 | error_init ("initializer element%s is not computable at load time", | |
de520661 | 4961 | " for `%s'", NULL); |
047de90b | 4962 | inside_init = error_mark_node; |
400fbf9f JW |
4963 | } |
4964 | ||
047de90b | 4965 | return inside_init; |
400fbf9f JW |
4966 | } |
4967 | ||
400fbf9f JW |
4968 | /* Handle scalar types, including conversions. */ |
4969 | ||
4970 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE | |
337633f9 | 4971 | || code == ENUMERAL_TYPE || code == COMPLEX_TYPE) |
400fbf9f | 4972 | { |
e3a12f0c RS |
4973 | /* Note that convert_for_assignment calls default_conversion |
4974 | for arrays and functions. We must not call it in the | |
4975 | case where inside_init is a null pointer constant. */ | |
4976 | inside_init | |
4977 | = convert_for_assignment (type, init, "initialization", | |
4978 | NULL_TREE, NULL_TREE, 0); | |
400fbf9f | 4979 | |
047de90b | 4980 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f JW |
4981 | { |
4982 | error_init ("initializer element%s is not constant", | |
de520661 | 4983 | " for `%s'", NULL); |
047de90b | 4984 | inside_init = error_mark_node; |
400fbf9f | 4985 | } |
f0c70ef0 RS |
4986 | else if (require_constant |
4987 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
4988 | { |
4989 | error_init ("initializer element%s is not computable at load time", | |
de520661 | 4990 | " for `%s'", NULL); |
047de90b | 4991 | inside_init = error_mark_node; |
400fbf9f JW |
4992 | } |
4993 | ||
047de90b | 4994 | return inside_init; |
400fbf9f JW |
4995 | } |
4996 | ||
4997 | /* Come here only for records and arrays. */ | |
4998 | ||
4999 | if (TYPE_SIZE (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
5000 | { | |
5001 | error_init ("variable-sized object%s may not be initialized", | |
de520661 | 5002 | " `%s'", NULL); |
400fbf9f JW |
5003 | return error_mark_node; |
5004 | } | |
5005 | ||
81a55c6c RS |
5006 | /* Traditionally, you can write struct foo x = 0; |
5007 | and it initializes the first element of x to 0. */ | |
5008 | if (flag_traditional) | |
5009 | { | |
6c99c37b | 5010 | tree top = 0, prev = 0, otype = type; |
81a55c6c RS |
5011 | while (TREE_CODE (type) == RECORD_TYPE |
5012 | || TREE_CODE (type) == ARRAY_TYPE | |
5013 | || TREE_CODE (type) == QUAL_UNION_TYPE | |
5014 | || TREE_CODE (type) == UNION_TYPE) | |
5015 | { | |
5016 | tree temp = build (CONSTRUCTOR, type, NULL_TREE, NULL_TREE); | |
5017 | if (prev == 0) | |
5018 | top = temp; | |
5019 | else | |
5020 | TREE_OPERAND (prev, 1) = build_tree_list (NULL_TREE, temp); | |
5021 | prev = temp; | |
5022 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5023 | type = TREE_TYPE (type); | |
5024 | else if (TYPE_FIELDS (type)) | |
5025 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
5026 | else | |
5027 | { | |
5028 | error_init ("invalid initializer%s", " for `%s'", NULL); | |
5029 | return error_mark_node; | |
5030 | } | |
5031 | } | |
6c99c37b RK |
5032 | |
5033 | if (otype != type) | |
5034 | { | |
5035 | TREE_OPERAND (prev, 1) | |
5036 | = build_tree_list (NULL_TREE, | |
5037 | digest_init (type, init, require_constant, | |
5038 | constructor_constant)); | |
5039 | return top; | |
5040 | } | |
5041 | else | |
5042 | return error_mark_node; | |
81a55c6c | 5043 | } |
de520661 | 5044 | error_init ("invalid initializer%s", " for `%s'", NULL); |
400fbf9f JW |
5045 | return error_mark_node; |
5046 | } | |
5047 | \f | |
de520661 | 5048 | /* Handle initializers that use braces. */ |
400fbf9f | 5049 | |
de520661 RS |
5050 | /* Type of object we are accumulating a constructor for. |
5051 | This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */ | |
5052 | static tree constructor_type; | |
400fbf9f | 5053 | |
de520661 RS |
5054 | /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields |
5055 | left to fill. */ | |
5056 | static tree constructor_fields; | |
400fbf9f | 5057 | |
de520661 RS |
5058 | /* For an ARRAY_TYPE, this is the specified index |
5059 | at which to store the next element we get. | |
5060 | This is a special INTEGER_CST node that we modify in place. */ | |
5061 | static tree constructor_index; | |
400fbf9f | 5062 | |
de520661 | 5063 | /* For an ARRAY_TYPE, this is the end index of the range |
ddd5a7c1 | 5064 | to initialize with the next element, or NULL in the ordinary case |
de520661 RS |
5065 | where the element is used just once. */ |
5066 | static tree constructor_range_end; | |
400fbf9f | 5067 | |
de520661 RS |
5068 | /* For an ARRAY_TYPE, this is the maximum index. */ |
5069 | static tree constructor_max_index; | |
103b7b17 | 5070 | |
de520661 RS |
5071 | /* For a RECORD_TYPE, this is the first field not yet written out. */ |
5072 | static tree constructor_unfilled_fields; | |
400fbf9f | 5073 | |
de520661 RS |
5074 | /* For an ARRAY_TYPE, this is the index of the first element |
5075 | not yet written out. | |
5076 | This is a special INTEGER_CST node that we modify in place. */ | |
5077 | static tree constructor_unfilled_index; | |
5078 | ||
b62acd60 RS |
5079 | /* In a RECORD_TYPE, the byte index of the next consecutive field. |
5080 | This is so we can generate gaps between fields, when appropriate. | |
5081 | This is a special INTEGER_CST node that we modify in place. */ | |
5082 | static tree constructor_bit_index; | |
5083 | ||
de520661 RS |
5084 | /* If we are saving up the elements rather than allocating them, |
5085 | this is the list of elements so far (in reverse order, | |
5086 | most recent first). */ | |
5087 | static tree constructor_elements; | |
5088 | ||
5089 | /* 1 if so far this constructor's elements are all compile-time constants. */ | |
5090 | static int constructor_constant; | |
5091 | ||
5092 | /* 1 if so far this constructor's elements are all valid address constants. */ | |
5093 | static int constructor_simple; | |
5094 | ||
5095 | /* 1 if this constructor is erroneous so far. */ | |
5096 | static int constructor_erroneous; | |
5097 | ||
5098 | /* 1 if have called defer_addressed_constants. */ | |
5099 | static int constructor_subconstants_deferred; | |
5100 | ||
5101 | /* List of pending elements at this constructor level. | |
5102 | These are elements encountered out of order | |
5103 | which belong at places we haven't reached yet in actually | |
5104 | writing the output. */ | |
5105 | static tree constructor_pending_elts; | |
5106 | ||
5107 | /* The SPELLING_DEPTH of this constructor. */ | |
5108 | static int constructor_depth; | |
5109 | ||
cc77d4d5 | 5110 | /* 0 if implicitly pushing constructor levels is allowed. */ |
0f41302f | 5111 | int constructor_no_implicit = 0; /* 0 for C; 1 for some other languages. */ |
cc77d4d5 | 5112 | |
de520661 RS |
5113 | static int require_constant_value; |
5114 | static int require_constant_elements; | |
5115 | ||
5116 | /* 1 if it is ok to output this constructor as we read it. | |
5117 | 0 means must accumulate a CONSTRUCTOR expression. */ | |
5118 | static int constructor_incremental; | |
5119 | ||
5120 | /* DECL node for which an initializer is being read. | |
5121 | 0 means we are reading a constructor expression | |
5122 | such as (struct foo) {...}. */ | |
5123 | static tree constructor_decl; | |
5124 | ||
5125 | /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */ | |
5126 | static char *constructor_asmspec; | |
5127 | ||
5128 | /* Nonzero if this is an initializer for a top-level decl. */ | |
5129 | static int constructor_top_level; | |
5130 | ||
b62acd60 RS |
5131 | \f |
5132 | /* This stack has a level for each implicit or explicit level of | |
5133 | structuring in the initializer, including the outermost one. It | |
5134 | saves the values of most of the variables above. */ | |
de520661 RS |
5135 | |
5136 | struct constructor_stack | |
400fbf9f | 5137 | { |
de520661 RS |
5138 | struct constructor_stack *next; |
5139 | tree type; | |
5140 | tree fields; | |
5141 | tree index; | |
5142 | tree range_end; | |
5143 | tree max_index; | |
5144 | tree unfilled_index; | |
5145 | tree unfilled_fields; | |
b62acd60 | 5146 | tree bit_index; |
de520661 RS |
5147 | tree elements; |
5148 | int offset; | |
5149 | tree pending_elts; | |
5150 | int depth; | |
790e9490 RS |
5151 | /* If nonzero, this value should replace the entire |
5152 | constructor at this level. */ | |
5153 | tree replacement_value; | |
de520661 RS |
5154 | char constant; |
5155 | char simple; | |
5156 | char implicit; | |
5157 | char incremental; | |
5158 | char erroneous; | |
5159 | char outer; | |
5160 | }; | |
d45cf215 | 5161 | |
de520661 | 5162 | struct constructor_stack *constructor_stack; |
400fbf9f | 5163 | |
de520661 RS |
5164 | /* This stack records separate initializers that are nested. |
5165 | Nested initializers can't happen in ANSI C, but GNU C allows them | |
5166 | in cases like { ... (struct foo) { ... } ... }. */ | |
400fbf9f | 5167 | |
de520661 RS |
5168 | struct initializer_stack |
5169 | { | |
5170 | struct initializer_stack *next; | |
5171 | tree decl; | |
5172 | char *asmspec; | |
5173 | struct constructor_stack *constructor_stack; | |
dea273df | 5174 | tree elements; |
de520661 RS |
5175 | struct spelling *spelling; |
5176 | struct spelling *spelling_base; | |
5177 | int spelling_size; | |
5178 | char top_level; | |
5179 | char incremental; | |
5180 | char require_constant_value; | |
5181 | char require_constant_elements; | |
5182 | char deferred; | |
5183 | }; | |
5184 | ||
5185 | struct initializer_stack *initializer_stack; | |
5186 | \f | |
5187 | /* Prepare to parse and output the initializer for variable DECL. */ | |
5188 | ||
5189 | void | |
e28cae4f | 5190 | start_init (decl, asmspec_tree, top_level) |
de520661 | 5191 | tree decl; |
e28cae4f | 5192 | tree asmspec_tree; |
de520661 RS |
5193 | int top_level; |
5194 | { | |
5195 | char *locus; | |
5196 | struct initializer_stack *p | |
5197 | = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack)); | |
e28cae4f RS |
5198 | char *asmspec = 0; |
5199 | ||
5200 | if (asmspec_tree) | |
5201 | asmspec = TREE_STRING_POINTER (asmspec_tree); | |
de520661 RS |
5202 | |
5203 | p->decl = constructor_decl; | |
5204 | p->asmspec = constructor_asmspec; | |
5205 | p->incremental = constructor_incremental; | |
5206 | p->require_constant_value = require_constant_value; | |
5207 | p->require_constant_elements = require_constant_elements; | |
5208 | p->constructor_stack = constructor_stack; | |
dea273df | 5209 | p->elements = constructor_elements; |
de520661 RS |
5210 | p->spelling = spelling; |
5211 | p->spelling_base = spelling_base; | |
5212 | p->spelling_size = spelling_size; | |
5213 | p->deferred = constructor_subconstants_deferred; | |
5214 | p->top_level = constructor_top_level; | |
b62acd60 | 5215 | p->next = initializer_stack; |
de520661 RS |
5216 | initializer_stack = p; |
5217 | ||
5218 | constructor_decl = decl; | |
5219 | constructor_incremental = top_level; | |
5220 | constructor_asmspec = asmspec; | |
5221 | constructor_subconstants_deferred = 0; | |
5222 | constructor_top_level = top_level; | |
5223 | ||
5224 | if (decl != 0) | |
3c3fa147 | 5225 | { |
de520661 | 5226 | require_constant_value = TREE_STATIC (decl); |
f1a2b955 RS |
5227 | require_constant_elements |
5228 | = ((TREE_STATIC (decl) || pedantic) | |
5229 | /* For a scalar, you can always use any value to initialize, | |
5230 | even within braces. */ | |
5231 | && (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE | |
5232 | || TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE | |
5233 | || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE | |
5234 | || TREE_CODE (TREE_TYPE (decl)) == QUAL_UNION_TYPE)); | |
de520661 RS |
5235 | locus = IDENTIFIER_POINTER (DECL_NAME (decl)); |
5236 | constructor_incremental |= TREE_STATIC (decl); | |
3c3fa147 | 5237 | } |
400fbf9f | 5238 | else |
de520661 RS |
5239 | { |
5240 | require_constant_value = 0; | |
5241 | require_constant_elements = 0; | |
5242 | locus = "(anonymous)"; | |
5243 | } | |
400fbf9f | 5244 | |
de520661 | 5245 | constructor_stack = 0; |
400fbf9f | 5246 | |
b71c7f8a RK |
5247 | missing_braces_mentioned = 0; |
5248 | ||
de520661 RS |
5249 | spelling_base = 0; |
5250 | spelling_size = 0; | |
5251 | RESTORE_SPELLING_DEPTH (0); | |
d45cf215 | 5252 | |
de520661 RS |
5253 | if (locus) |
5254 | push_string (locus); | |
5255 | } | |
400fbf9f | 5256 | |
de520661 RS |
5257 | void |
5258 | finish_init () | |
5259 | { | |
5260 | struct initializer_stack *p = initializer_stack; | |
400fbf9f | 5261 | |
de520661 RS |
5262 | /* Output subconstants (string constants, usually) |
5263 | that were referenced within this initializer and saved up. | |
5264 | Must do this if and only if we called defer_addressed_constants. */ | |
5265 | if (constructor_subconstants_deferred) | |
5266 | output_deferred_addressed_constants (); | |
4f77a31b | 5267 | |
de520661 RS |
5268 | /* Free the whole constructor stack of this initializer. */ |
5269 | while (constructor_stack) | |
5270 | { | |
5271 | struct constructor_stack *q = constructor_stack; | |
5272 | constructor_stack = q->next; | |
5273 | free (q); | |
5274 | } | |
400fbf9f | 5275 | |
de520661 RS |
5276 | /* Pop back to the data of the outer initializer (if any). */ |
5277 | constructor_decl = p->decl; | |
5278 | constructor_asmspec = p->asmspec; | |
5279 | constructor_incremental = p->incremental; | |
5280 | require_constant_value = p->require_constant_value; | |
5281 | require_constant_elements = p->require_constant_elements; | |
5282 | constructor_stack = p->constructor_stack; | |
dea273df | 5283 | constructor_elements = p->elements; |
de520661 RS |
5284 | spelling = p->spelling; |
5285 | spelling_base = p->spelling_base; | |
5286 | spelling_size = p->spelling_size; | |
5287 | constructor_subconstants_deferred = p->deferred; | |
5288 | constructor_top_level = p->top_level; | |
5289 | initializer_stack = p->next; | |
5290 | free (p); | |
5291 | } | |
5292 | \f | |
5293 | /* Call here when we see the initializer is surrounded by braces. | |
5294 | This is instead of a call to push_init_level; | |
5295 | it is matched by a call to pop_init_level. | |
400fbf9f | 5296 | |
de520661 RS |
5297 | TYPE is the type to initialize, for a constructor expression. |
5298 | For an initializer for a decl, TYPE is zero. */ | |
5a7ec9d9 | 5299 | |
de520661 RS |
5300 | void |
5301 | really_start_incremental_init (type) | |
5302 | tree type; | |
5303 | { | |
5304 | struct constructor_stack *p | |
5305 | = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); | |
5306 | ||
5307 | if (type == 0) | |
5308 | type = TREE_TYPE (constructor_decl); | |
5309 | ||
5310 | /* Turn off constructor_incremental if type is a struct with bitfields. | |
5311 | Do this before the first push, so that the corrected value | |
5312 | is available in finish_init. */ | |
5313 | check_init_type_bitfields (type); | |
5314 | ||
5315 | p->type = constructor_type; | |
5316 | p->fields = constructor_fields; | |
5317 | p->index = constructor_index; | |
5318 | p->range_end = constructor_range_end; | |
5319 | p->max_index = constructor_max_index; | |
5320 | p->unfilled_index = constructor_unfilled_index; | |
5321 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5322 | p->bit_index = constructor_bit_index; |
5cb7368c | 5323 | p->elements = constructor_elements; |
de520661 RS |
5324 | p->constant = constructor_constant; |
5325 | p->simple = constructor_simple; | |
5326 | p->erroneous = constructor_erroneous; | |
5327 | p->pending_elts = constructor_pending_elts; | |
5328 | p->depth = constructor_depth; | |
790e9490 | 5329 | p->replacement_value = 0; |
de520661 RS |
5330 | p->implicit = 0; |
5331 | p->incremental = constructor_incremental; | |
5332 | p->outer = 0; | |
5333 | p->next = 0; | |
5334 | constructor_stack = p; | |
5335 | ||
5336 | constructor_constant = 1; | |
5337 | constructor_simple = 1; | |
5338 | constructor_depth = SPELLING_DEPTH (); | |
5339 | constructor_elements = 0; | |
5340 | constructor_pending_elts = 0; | |
5341 | constructor_type = type; | |
5342 | ||
5343 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5344 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5345 | { | |
5346 | constructor_fields = TYPE_FIELDS (constructor_type); | |
abc95ed3 | 5347 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 | 5348 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) |
fc623854 RS |
5349 | && DECL_NAME (constructor_fields) == 0) |
5350 | constructor_fields = TREE_CHAIN (constructor_fields); | |
de520661 | 5351 | constructor_unfilled_fields = constructor_fields; |
b62acd60 | 5352 | constructor_bit_index = copy_node (integer_zero_node); |
f8dac6eb | 5353 | TREE_TYPE (constructor_bit_index) = sbitsizetype; |
de520661 RS |
5354 | } |
5355 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5356 | { | |
de520661 | 5357 | constructor_range_end = 0; |
de520661 | 5358 | if (TYPE_DOMAIN (constructor_type)) |
2bede729 PB |
5359 | { |
5360 | constructor_max_index | |
5361 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
5362 | constructor_index | |
5363 | = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5364 | } | |
5365 | else | |
5366 | constructor_index = copy_node (integer_zero_node); | |
5367 | constructor_unfilled_index = copy_node (constructor_index); | |
de520661 RS |
5368 | } |
5369 | else | |
5370 | { | |
5371 | /* Handle the case of int x = {5}; */ | |
5372 | constructor_fields = constructor_type; | |
5373 | constructor_unfilled_fields = constructor_type; | |
5374 | } | |
400fbf9f | 5375 | |
de520661 RS |
5376 | if (constructor_incremental) |
5377 | { | |
5378 | int momentary = suspend_momentary (); | |
5379 | push_obstacks_nochange (); | |
5380 | if (TREE_PERMANENT (constructor_decl)) | |
5381 | end_temporary_allocation (); | |
5382 | make_decl_rtl (constructor_decl, constructor_asmspec, | |
5383 | constructor_top_level); | |
5384 | assemble_variable (constructor_decl, constructor_top_level, 0, 1); | |
5385 | pop_obstacks (); | |
5386 | resume_momentary (momentary); | |
5387 | } | |
400fbf9f | 5388 | |
de520661 RS |
5389 | if (constructor_incremental) |
5390 | { | |
5391 | defer_addressed_constants (); | |
5392 | constructor_subconstants_deferred = 1; | |
5393 | } | |
5394 | } | |
5395 | \f | |
5396 | /* Push down into a subobject, for initialization. | |
5397 | If this is for an explicit set of braces, IMPLICIT is 0. | |
5398 | If it is because the next element belongs at a lower level, | |
5399 | IMPLICIT is 1. */ | |
400fbf9f | 5400 | |
de520661 RS |
5401 | void |
5402 | push_init_level (implicit) | |
5403 | int implicit; | |
5404 | { | |
94ba5069 RS |
5405 | struct constructor_stack *p; |
5406 | ||
5407 | /* If we've exhausted any levels that didn't have braces, | |
5408 | pop them now. */ | |
5409 | while (constructor_stack->implicit) | |
5410 | { | |
5411 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5412 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5413 | && constructor_fields == 0) | |
5414 | process_init_element (pop_init_level (1)); | |
5415 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5416 | && tree_int_cst_lt (constructor_max_index, constructor_index)) | |
5417 | process_init_element (pop_init_level (1)); | |
5418 | else | |
5419 | break; | |
5420 | } | |
5421 | ||
bdc49177 JW |
5422 | /* Structure elements may require alignment. Do this now if necessary |
5423 | for the subaggregate, and if it comes next in sequence. Don't do | |
5424 | this for subaggregates that will go on the pending list. */ | |
7eec3328 | 5425 | if (constructor_incremental && constructor_type != 0 |
bdc49177 JW |
5426 | && TREE_CODE (constructor_type) == RECORD_TYPE && constructor_fields |
5427 | && constructor_fields == constructor_unfilled_fields) | |
e700c8ec RS |
5428 | { |
5429 | /* Advance to offset of this element. */ | |
5430 | if (! tree_int_cst_equal (constructor_bit_index, | |
5431 | DECL_FIELD_BITPOS (constructor_fields))) | |
5432 | { | |
f8dac6eb R |
5433 | /* By using unsigned arithmetic, the result will be correct even |
5434 | in case of overflows, if BITS_PER_UNIT is a power of two. */ | |
5435 | unsigned next = (TREE_INT_CST_LOW | |
5436 | (DECL_FIELD_BITPOS (constructor_fields)) | |
5437 | / (unsigned)BITS_PER_UNIT); | |
5438 | unsigned here = (TREE_INT_CST_LOW (constructor_bit_index) | |
5439 | / (unsigned)BITS_PER_UNIT); | |
5440 | ||
5441 | assemble_zeros ((next - here) | |
5442 | * (unsigned)BITS_PER_UNIT | |
5443 | / (unsigned)BITS_PER_UNIT); | |
e700c8ec | 5444 | } |
24c032e9 JW |
5445 | /* Indicate that we have now filled the structure up to the current |
5446 | field. */ | |
5447 | constructor_unfilled_fields = constructor_fields; | |
e700c8ec RS |
5448 | } |
5449 | ||
94ba5069 | 5450 | p = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); |
de520661 RS |
5451 | p->type = constructor_type; |
5452 | p->fields = constructor_fields; | |
5453 | p->index = constructor_index; | |
5454 | p->range_end = constructor_range_end; | |
5455 | p->max_index = constructor_max_index; | |
5456 | p->unfilled_index = constructor_unfilled_index; | |
5457 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5458 | p->bit_index = constructor_bit_index; |
de520661 RS |
5459 | p->elements = constructor_elements; |
5460 | p->constant = constructor_constant; | |
5461 | p->simple = constructor_simple; | |
5462 | p->erroneous = constructor_erroneous; | |
5463 | p->pending_elts = constructor_pending_elts; | |
5464 | p->depth = constructor_depth; | |
790e9490 | 5465 | p->replacement_value = 0; |
de520661 RS |
5466 | p->implicit = implicit; |
5467 | p->incremental = constructor_incremental; | |
5468 | p->outer = 0; | |
5469 | p->next = constructor_stack; | |
5470 | constructor_stack = p; | |
5471 | ||
5472 | constructor_constant = 1; | |
5473 | constructor_simple = 1; | |
5474 | constructor_depth = SPELLING_DEPTH (); | |
5475 | constructor_elements = 0; | |
5476 | constructor_pending_elts = 0; | |
5477 | ||
94ba5069 RS |
5478 | /* Don't die if an entire brace-pair level is superfluous |
5479 | in the containing level. */ | |
5480 | if (constructor_type == 0) | |
5481 | ; | |
5482 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5483 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
de520661 | 5484 | { |
91fa3c30 RS |
5485 | /* Don't die if there are extra init elts at the end. */ |
5486 | if (constructor_fields == 0) | |
5487 | constructor_type = 0; | |
5488 | else | |
5489 | { | |
5490 | constructor_type = TREE_TYPE (constructor_fields); | |
19d76e60 | 5491 | push_member_name (constructor_fields); |
e4376e63 | 5492 | constructor_depth++; |
81f415f0 RK |
5493 | if (constructor_fields != constructor_unfilled_fields) |
5494 | constructor_incremental = 0; | |
91fa3c30 | 5495 | } |
de520661 RS |
5496 | } |
5497 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5498 | { | |
5499 | constructor_type = TREE_TYPE (constructor_type); | |
5500 | push_array_bounds (TREE_INT_CST_LOW (constructor_index)); | |
e4376e63 | 5501 | constructor_depth++; |
20e5a991 RK |
5502 | if (! tree_int_cst_equal (constructor_index, constructor_unfilled_index) |
5503 | || constructor_range_end != 0) | |
81f415f0 | 5504 | constructor_incremental = 0; |
de520661 | 5505 | } |
400fbf9f | 5506 | |
91fa3c30 RS |
5507 | if (constructor_type == 0) |
5508 | { | |
5509 | error_init ("extra brace group at end of initializer%s", | |
5510 | " for `%s'", NULL); | |
5511 | constructor_fields = 0; | |
5512 | constructor_unfilled_fields = 0; | |
b71c7f8a | 5513 | return; |
91fa3c30 | 5514 | } |
b71c7f8a RK |
5515 | |
5516 | /* Turn off constructor_incremental if type is a struct with bitfields. */ | |
5517 | check_init_type_bitfields (constructor_type); | |
5518 | ||
5519 | if (implicit && warn_missing_braces && !missing_braces_mentioned) | |
5520 | { | |
5521 | missing_braces_mentioned = 1; | |
5522 | warning_init ("missing braces around initializer%s", " for `%s'", NULL); | |
5523 | } | |
5524 | ||
5525 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
91fa3c30 | 5526 | || TREE_CODE (constructor_type) == UNION_TYPE) |
de520661 RS |
5527 | { |
5528 | constructor_fields = TYPE_FIELDS (constructor_type); | |
abc95ed3 | 5529 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 | 5530 | while (constructor_fields != 0 && DECL_C_BIT_FIELD (constructor_fields) |
fc623854 RS |
5531 | && DECL_NAME (constructor_fields) == 0) |
5532 | constructor_fields = TREE_CHAIN (constructor_fields); | |
de520661 | 5533 | constructor_unfilled_fields = constructor_fields; |
b62acd60 | 5534 | constructor_bit_index = copy_node (integer_zero_node); |
f8dac6eb | 5535 | TREE_TYPE (constructor_bit_index) = sbitsizetype; |
de520661 RS |
5536 | } |
5537 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5538 | { | |
de520661 | 5539 | constructor_range_end = 0; |
de520661 | 5540 | if (TYPE_DOMAIN (constructor_type)) |
2bede729 PB |
5541 | { |
5542 | constructor_max_index | |
5543 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
5544 | constructor_index | |
5545 | = copy_node (TYPE_MIN_VALUE (TYPE_DOMAIN (constructor_type))); | |
5546 | } | |
5547 | else | |
5548 | constructor_index = copy_node (integer_zero_node); | |
5549 | constructor_unfilled_index = copy_node (constructor_index); | |
de520661 RS |
5550 | } |
5551 | else | |
5552 | { | |
b71c7f8a | 5553 | warning_init ("braces around scalar initializer%s", " for `%s'", NULL); |
de520661 RS |
5554 | constructor_fields = constructor_type; |
5555 | constructor_unfilled_fields = constructor_type; | |
5556 | } | |
5557 | } | |
400fbf9f | 5558 | |
de520661 RS |
5559 | /* Don't read a struct incrementally if it has any bitfields, |
5560 | because the incremental reading code doesn't know how to | |
5561 | handle bitfields yet. */ | |
d45cf215 | 5562 | |
de520661 RS |
5563 | static void |
5564 | check_init_type_bitfields (type) | |
5565 | tree type; | |
5566 | { | |
5567 | if (TREE_CODE (type) == RECORD_TYPE) | |
5568 | { | |
5569 | tree tail; | |
5570 | for (tail = TYPE_FIELDS (type); tail; | |
5571 | tail = TREE_CHAIN (tail)) | |
3c9d8baf | 5572 | { |
ef86d2a6 | 5573 | if (DECL_C_BIT_FIELD (tail) |
3c9d8baf RK |
5574 | /* This catches cases like `int foo : 8;'. */ |
5575 | || DECL_MODE (tail) != TYPE_MODE (TREE_TYPE (tail))) | |
5576 | { | |
5577 | constructor_incremental = 0; | |
5578 | break; | |
5579 | } | |
5580 | ||
5581 | check_init_type_bitfields (TREE_TYPE (tail)); | |
5582 | } | |
400fbf9f | 5583 | } |
3c9d8baf RK |
5584 | |
5585 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
5586 | check_init_type_bitfields (TREE_TYPE (type)); | |
de520661 RS |
5587 | } |
5588 | ||
5589 | /* At the end of an implicit or explicit brace level, | |
5590 | finish up that level of constructor. | |
5591 | If we were outputting the elements as they are read, return 0 | |
5592 | from inner levels (process_init_element ignores that), | |
5593 | but return error_mark_node from the outermost level | |
5594 | (that's what we want to put in DECL_INITIAL). | |
5595 | Otherwise, return a CONSTRUCTOR expression. */ | |
5596 | ||
5597 | tree | |
5598 | pop_init_level (implicit) | |
5599 | int implicit; | |
5600 | { | |
5601 | struct constructor_stack *p; | |
9d5f3e49 | 5602 | int size = 0; |
de520661 RS |
5603 | tree constructor = 0; |
5604 | ||
5605 | if (implicit == 0) | |
400fbf9f | 5606 | { |
de520661 RS |
5607 | /* When we come to an explicit close brace, |
5608 | pop any inner levels that didn't have explicit braces. */ | |
5609 | while (constructor_stack->implicit) | |
5610 | process_init_element (pop_init_level (1)); | |
5611 | } | |
400fbf9f | 5612 | |
de520661 | 5613 | p = constructor_stack; |
91fa3c30 RS |
5614 | |
5615 | if (constructor_type != 0) | |
5616 | size = int_size_in_bytes (constructor_type); | |
400fbf9f | 5617 | |
de520661 RS |
5618 | /* Now output all pending elements. */ |
5619 | output_pending_init_elements (1); | |
5620 | ||
b62acd60 RS |
5621 | #if 0 /* c-parse.in warns about {}. */ |
5622 | /* In ANSI, each brace level must have at least one element. */ | |
5623 | if (! implicit && pedantic | |
5624 | && (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5625 | ? integer_zerop (constructor_unfilled_index) | |
5626 | : constructor_unfilled_fields == TYPE_FIELDS (constructor_type))) | |
5627 | pedwarn_init ("empty braces in initializer%s", " for `%s'", NULL); | |
5628 | #endif | |
5629 | ||
de520661 RS |
5630 | /* Pad out the end of the structure. */ |
5631 | ||
790e9490 RS |
5632 | if (p->replacement_value) |
5633 | { | |
5634 | /* If this closes a superfluous brace pair, | |
5635 | just pass out the element between them. */ | |
5636 | constructor = p->replacement_value; | |
5637 | /* If this is the top level thing within the initializer, | |
d11fdb45 | 5638 | and it's for a variable, then since we already called |
790e9490 RS |
5639 | assemble_variable, we must output the value now. */ |
5640 | if (p->next == 0 && constructor_decl != 0 | |
5641 | && constructor_incremental) | |
5642 | { | |
5643 | constructor = digest_init (constructor_type, constructor, | |
48dd3a7c RK |
5644 | require_constant_value, |
5645 | require_constant_elements); | |
790e9490 RS |
5646 | |
5647 | /* If initializing an array of unknown size, | |
5648 | determine the size now. */ | |
5649 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5650 | && TYPE_DOMAIN (constructor_type) == 0) | |
5651 | { | |
5652 | int failure; | |
5ded5b76 | 5653 | int momentary_p; |
790e9490 RS |
5654 | |
5655 | push_obstacks_nochange (); | |
5656 | if (TREE_PERMANENT (constructor_type)) | |
5657 | end_temporary_allocation (); | |
5658 | ||
5ded5b76 RK |
5659 | momentary_p = suspend_momentary (); |
5660 | ||
790e9490 RS |
5661 | /* We shouldn't have an incomplete array type within |
5662 | some other type. */ | |
5663 | if (constructor_stack->next) | |
5664 | abort (); | |
5665 | ||
5666 | failure | |
5667 | = complete_array_type (constructor_type, | |
5668 | constructor, 0); | |
5669 | if (failure) | |
5670 | abort (); | |
5671 | ||
5672 | size = int_size_in_bytes (constructor_type); | |
5ded5b76 | 5673 | resume_momentary (momentary_p); |
790e9490 RS |
5674 | pop_obstacks (); |
5675 | } | |
5676 | ||
5677 | output_constant (constructor, size); | |
5678 | } | |
5679 | } | |
91fa3c30 RS |
5680 | else if (constructor_type == 0) |
5681 | ; | |
19d76e60 RK |
5682 | else if (TREE_CODE (constructor_type) != RECORD_TYPE |
5683 | && TREE_CODE (constructor_type) != UNION_TYPE | |
5684 | && TREE_CODE (constructor_type) != ARRAY_TYPE | |
5685 | && ! constructor_incremental) | |
5686 | { | |
5687 | /* A nonincremental scalar initializer--just return | |
5688 | the element, after verifying there is just one. */ | |
5689 | if (constructor_elements == 0) | |
5690 | { | |
5691 | error_init ("empty scalar initializer%s", | |
5692 | " for `%s'", NULL); | |
5693 | constructor = error_mark_node; | |
5694 | } | |
5695 | else if (TREE_CHAIN (constructor_elements) != 0) | |
5696 | { | |
5697 | error_init ("extra elements in scalar initializer%s", | |
5698 | " for `%s'", NULL); | |
5699 | constructor = TREE_VALUE (constructor_elements); | |
5700 | } | |
5701 | else | |
5702 | constructor = TREE_VALUE (constructor_elements); | |
5703 | } | |
790e9490 | 5704 | else if (! constructor_incremental) |
de520661 RS |
5705 | { |
5706 | if (constructor_erroneous) | |
5707 | constructor = error_mark_node; | |
5708 | else | |
400fbf9f | 5709 | { |
de520661 RS |
5710 | int momentary = suspend_momentary (); |
5711 | ||
5712 | constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE, | |
5713 | nreverse (constructor_elements)); | |
5714 | if (constructor_constant) | |
5715 | TREE_CONSTANT (constructor) = 1; | |
5716 | if (constructor_constant && constructor_simple) | |
5717 | TREE_STATIC (constructor) = 1; | |
19d76e60 | 5718 | |
de520661 RS |
5719 | resume_momentary (momentary); |
5720 | } | |
5721 | } | |
5722 | else | |
5723 | { | |
5724 | tree filled; | |
5725 | int momentary = suspend_momentary (); | |
400fbf9f | 5726 | |
de520661 RS |
5727 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5728 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5729 | { | |
de520661 RS |
5730 | /* Find the offset of the end of that field. */ |
5731 | filled = size_binop (CEIL_DIV_EXPR, | |
b62acd60 | 5732 | constructor_bit_index, |
de520661 RS |
5733 | size_int (BITS_PER_UNIT)); |
5734 | } | |
5735 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5736 | { | |
5737 | /* If initializing an array of unknown size, | |
5738 | determine the size now. */ | |
5739 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5740 | && TYPE_DOMAIN (constructor_type) == 0) | |
400fbf9f | 5741 | { |
de520661 RS |
5742 | tree maxindex |
5743 | = size_binop (MINUS_EXPR, | |
5744 | constructor_unfilled_index, | |
5745 | integer_one_node); | |
5746 | ||
5747 | push_obstacks_nochange (); | |
5748 | if (TREE_PERMANENT (constructor_type)) | |
5749 | end_temporary_allocation (); | |
5750 | maxindex = copy_node (maxindex); | |
5751 | TYPE_DOMAIN (constructor_type) = build_index_type (maxindex); | |
5752 | TREE_TYPE (maxindex) = TYPE_DOMAIN (constructor_type); | |
5753 | ||
45ce961e JW |
5754 | /* TYPE_MAX_VALUE is always one less than the number of elements |
5755 | in the array, because we start counting at zero. Therefore, | |
5756 | warn only if the value is less than zero. */ | |
de520661 | 5757 | if (pedantic |
ff3225e7 | 5758 | && (tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type))) |
45ce961e | 5759 | < 0)) |
ff3225e7 RK |
5760 | error_with_decl (constructor_decl, |
5761 | "zero or negative array size `%s'"); | |
de520661 RS |
5762 | layout_type (constructor_type); |
5763 | size = int_size_in_bytes (constructor_type); | |
5764 | pop_obstacks (); | |
400fbf9f JW |
5765 | } |
5766 | ||
de520661 RS |
5767 | filled = size_binop (MULT_EXPR, constructor_unfilled_index, |
5768 | size_in_bytes (TREE_TYPE (constructor_type))); | |
5769 | } | |
5770 | else | |
5771 | filled = 0; | |
400fbf9f | 5772 | |
de520661 RS |
5773 | if (filled != 0) |
5774 | assemble_zeros (size - TREE_INT_CST_LOW (filled)); | |
5775 | ||
5776 | resume_momentary (momentary); | |
5777 | } | |
5778 | ||
5779 | ||
5780 | constructor_type = p->type; | |
5781 | constructor_fields = p->fields; | |
5782 | constructor_index = p->index; | |
5783 | constructor_range_end = p->range_end; | |
5784 | constructor_max_index = p->max_index; | |
5785 | constructor_unfilled_index = p->unfilled_index; | |
5786 | constructor_unfilled_fields = p->unfilled_fields; | |
b62acd60 | 5787 | constructor_bit_index = p->bit_index; |
de520661 RS |
5788 | constructor_elements = p->elements; |
5789 | constructor_constant = p->constant; | |
5790 | constructor_simple = p->simple; | |
5791 | constructor_erroneous = p->erroneous; | |
5792 | constructor_pending_elts = p->pending_elts; | |
5793 | constructor_depth = p->depth; | |
5794 | constructor_incremental = p->incremental; | |
5795 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
5796 | ||
5797 | constructor_stack = p->next; | |
5798 | free (p); | |
5799 | ||
5800 | if (constructor == 0) | |
5801 | { | |
5802 | if (constructor_stack == 0) | |
5803 | return error_mark_node; | |
5804 | return NULL_TREE; | |
5805 | } | |
5806 | return constructor; | |
5807 | } | |
5808 | ||
5809 | /* Within an array initializer, specify the next index to be initialized. | |
5810 | FIRST is that index. If LAST is nonzero, then initialize a range | |
5811 | of indices, running from FIRST through LAST. */ | |
5812 | ||
5813 | void | |
5814 | set_init_index (first, last) | |
5815 | tree first, last; | |
5816 | { | |
19d76e60 RK |
5817 | while ((TREE_CODE (first) == NOP_EXPR |
5818 | || TREE_CODE (first) == CONVERT_EXPR | |
5819 | || TREE_CODE (first) == NON_LVALUE_EXPR) | |
5820 | && (TYPE_MODE (TREE_TYPE (first)) | |
5821 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (first, 0))))) | |
5822 | (first) = TREE_OPERAND (first, 0); | |
5823 | if (last) | |
5824 | while ((TREE_CODE (last) == NOP_EXPR | |
5825 | || TREE_CODE (last) == CONVERT_EXPR | |
5826 | || TREE_CODE (last) == NON_LVALUE_EXPR) | |
5827 | && (TYPE_MODE (TREE_TYPE (last)) | |
5828 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (last, 0))))) | |
5829 | (last) = TREE_OPERAND (last, 0); | |
5830 | ||
94ba5069 RS |
5831 | if (TREE_CODE (first) != INTEGER_CST) |
5832 | error_init ("nonconstant array index in initializer%s", " for `%s'", NULL); | |
5833 | else if (last != 0 && TREE_CODE (last) != INTEGER_CST) | |
5834 | error_init ("nonconstant array index in initializer%s", " for `%s'", NULL); | |
7b1d6e6e RK |
5835 | else if (! constructor_unfilled_index) |
5836 | error_init ("array index in non-array initializer%s", " for `%s'", NULL); | |
94ba5069 | 5837 | else if (tree_int_cst_lt (first, constructor_unfilled_index)) |
de520661 RS |
5838 | error_init ("duplicate array index in initializer%s", " for `%s'", NULL); |
5839 | else | |
5840 | { | |
ee2990e7 RK |
5841 | TREE_INT_CST_LOW (constructor_index) = TREE_INT_CST_LOW (first); |
5842 | TREE_INT_CST_HIGH (constructor_index) = TREE_INT_CST_HIGH (first); | |
de520661 RS |
5843 | |
5844 | if (last != 0 && tree_int_cst_lt (last, first)) | |
5845 | error_init ("empty index range in initializer%s", " for `%s'", NULL); | |
5846 | else | |
b62acd60 RS |
5847 | { |
5848 | if (pedantic) | |
5849 | pedwarn ("ANSI C forbids specifying element to initialize"); | |
5850 | constructor_range_end = last; | |
5851 | } | |
de520661 RS |
5852 | } |
5853 | } | |
5854 | ||
5855 | /* Within a struct initializer, specify the next field to be initialized. */ | |
5856 | ||
94ba5069 | 5857 | void |
de520661 RS |
5858 | set_init_label (fieldname) |
5859 | tree fieldname; | |
5860 | { | |
5861 | tree tail; | |
5862 | int passed = 0; | |
5863 | ||
e5cfb88f RK |
5864 | /* Don't die if an entire brace-pair level is superfluous |
5865 | in the containing level. */ | |
5866 | if (constructor_type == 0) | |
5867 | return; | |
5868 | ||
de520661 RS |
5869 | for (tail = TYPE_FIELDS (constructor_type); tail; |
5870 | tail = TREE_CHAIN (tail)) | |
5871 | { | |
5872 | if (tail == constructor_unfilled_fields) | |
5873 | passed = 1; | |
5874 | if (DECL_NAME (tail) == fieldname) | |
5875 | break; | |
5876 | } | |
5877 | ||
5878 | if (tail == 0) | |
5879 | error ("unknown field `%s' specified in initializer", | |
5880 | IDENTIFIER_POINTER (fieldname)); | |
5881 | else if (!passed) | |
5882 | error ("field `%s' already initialized", | |
5883 | IDENTIFIER_POINTER (fieldname)); | |
5884 | else | |
b62acd60 RS |
5885 | { |
5886 | constructor_fields = tail; | |
5887 | if (pedantic) | |
5888 | pedwarn ("ANSI C forbids specifying structure member to initialize"); | |
5889 | } | |
de520661 RS |
5890 | } |
5891 | \f | |
5892 | /* "Output" the next constructor element. | |
5893 | At top level, really output it to assembler code now. | |
5894 | Otherwise, collect it in a list from which we will make a CONSTRUCTOR. | |
5895 | TYPE is the data type that the containing data type wants here. | |
5896 | FIELD is the field (a FIELD_DECL) or the index that this element fills. | |
5897 | ||
5898 | PENDING if non-nil means output pending elements that belong | |
5899 | right after this element. (PENDING is normally 1; | |
5900 | it is 0 while outputting pending elements, to avoid recursion.) */ | |
5901 | ||
34403047 | 5902 | static void |
de520661 RS |
5903 | output_init_element (value, type, field, pending) |
5904 | tree value, type, field; | |
5905 | int pending; | |
5906 | { | |
5907 | int duplicate = 0; | |
5908 | ||
d3ab9753 RS |
5909 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE |
5910 | || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
fd5d5b94 RS |
5911 | && !(TREE_CODE (value) == STRING_CST |
5912 | && TREE_CODE (type) == ARRAY_TYPE | |
5913 | && TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE) | |
1e40eab8 RS |
5914 | && !comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (value)), |
5915 | TYPE_MAIN_VARIANT (type)))) | |
d3ab9753 RS |
5916 | value = default_conversion (value); |
5917 | ||
5918 | if (value == error_mark_node) | |
5919 | constructor_erroneous = 1; | |
5920 | else if (!TREE_CONSTANT (value)) | |
5921 | constructor_constant = 0; | |
4160009f RK |
5922 | else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0 |
5923 | || ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5924 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
ef86d2a6 RK |
5925 | && DECL_C_BIT_FIELD (field) |
5926 | && TREE_CODE (value) != INTEGER_CST)) | |
d3ab9753 RS |
5927 | constructor_simple = 0; |
5928 | ||
de520661 RS |
5929 | if (require_constant_value && ! TREE_CONSTANT (value)) |
5930 | { | |
5931 | error_init ("initializer element%s is not constant", | |
5932 | " for `%s'", NULL); | |
5933 | value = error_mark_node; | |
5934 | } | |
5935 | else if (require_constant_elements | |
5936 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) | |
5937 | { | |
5938 | error_init ("initializer element%s is not computable at load time", | |
5939 | " for `%s'", NULL); | |
5940 | value = error_mark_node; | |
5941 | } | |
5942 | ||
5943 | /* If this element duplicates one on constructor_pending_elts, | |
5944 | print a message and ignore it. Don't do this when we're | |
5945 | processing elements taken off constructor_pending_elts, | |
5946 | because we'd always get spurious errors. */ | |
5947 | if (pending) | |
5948 | { | |
5949 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5950 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5951 | { | |
5952 | if (purpose_member (field, constructor_pending_elts)) | |
400fbf9f | 5953 | { |
de520661 RS |
5954 | error_init ("duplicate initializer%s", " for `%s'", NULL); |
5955 | duplicate = 1; | |
400fbf9f | 5956 | } |
de520661 RS |
5957 | } |
5958 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5959 | { | |
5960 | tree tail; | |
5961 | for (tail = constructor_pending_elts; tail; | |
5962 | tail = TREE_CHAIN (tail)) | |
5963 | if (TREE_PURPOSE (tail) != 0 | |
5964 | && TREE_CODE (TREE_PURPOSE (tail)) == INTEGER_CST | |
5965 | && tree_int_cst_equal (TREE_PURPOSE (tail), constructor_index)) | |
5966 | break; | |
400fbf9f | 5967 | |
de520661 | 5968 | if (tail != 0) |
400fbf9f | 5969 | { |
de520661 RS |
5970 | error_init ("duplicate initializer%s", " for `%s'", NULL); |
5971 | duplicate = 1; | |
400fbf9f | 5972 | } |
400fbf9f JW |
5973 | } |
5974 | } | |
400fbf9f | 5975 | |
de520661 RS |
5976 | /* If this element doesn't come next in sequence, |
5977 | put it on constructor_pending_elts. */ | |
5978 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5979 | && !tree_int_cst_equal (field, constructor_unfilled_index)) | |
5980 | { | |
5981 | if (! duplicate) | |
8348547a RS |
5982 | /* The copy_node is needed in case field is actually |
5983 | constructor_index, which is modified in place. */ | |
de520661 | 5984 | constructor_pending_elts |
8348547a | 5985 | = tree_cons (copy_node (field), |
48dd3a7c RK |
5986 | digest_init (type, value, require_constant_value, |
5987 | require_constant_elements), | |
de520661 RS |
5988 | constructor_pending_elts); |
5989 | } | |
76aaaae2 | 5990 | else if (TREE_CODE (constructor_type) == RECORD_TYPE |
de520661 RS |
5991 | && field != constructor_unfilled_fields) |
5992 | { | |
76aaaae2 RS |
5993 | /* We do this for records but not for unions. In a union, |
5994 | no matter which field is specified, it can be initialized | |
5995 | right away since it starts at the beginning of the union. */ | |
de520661 RS |
5996 | if (!duplicate) |
5997 | constructor_pending_elts | |
5998 | = tree_cons (field, | |
48dd3a7c RK |
5999 | digest_init (type, value, require_constant_value, |
6000 | require_constant_elements), | |
de520661 RS |
6001 | constructor_pending_elts); |
6002 | } | |
6003 | else | |
6004 | { | |
6005 | /* Otherwise, output this element either to | |
6006 | constructor_elements or to the assembler file. */ | |
400fbf9f | 6007 | |
de520661 | 6008 | if (!duplicate) |
c2f4acb7 | 6009 | { |
de520661 | 6010 | if (! constructor_incremental) |
94ba5069 | 6011 | { |
19d76e60 | 6012 | if (field && TREE_CODE (field) == INTEGER_CST) |
94ba5069 RS |
6013 | field = copy_node (field); |
6014 | constructor_elements | |
48dd3a7c RK |
6015 | = tree_cons (field, digest_init (type, value, |
6016 | require_constant_value, | |
6017 | require_constant_elements), | |
94ba5069 RS |
6018 | constructor_elements); |
6019 | } | |
de520661 | 6020 | else |
b62acd60 RS |
6021 | { |
6022 | /* Structure elements may require alignment. | |
6023 | Do this, if necessary. */ | |
6024 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
6025 | { | |
6026 | /* Advance to offset of this element. */ | |
6027 | if (! tree_int_cst_equal (constructor_bit_index, | |
b5ff0f70 | 6028 | DECL_FIELD_BITPOS (field))) |
b62acd60 | 6029 | { |
f8dac6eb R |
6030 | /* By using unsigned arithmetic, the result will be |
6031 | correct even in case of overflows, if BITS_PER_UNIT | |
6032 | is a power of two. */ | |
6033 | unsigned next = (TREE_INT_CST_LOW | |
6034 | (DECL_FIELD_BITPOS (field)) | |
6035 | / (unsigned)BITS_PER_UNIT); | |
6036 | unsigned here = (TREE_INT_CST_LOW | |
6037 | (constructor_bit_index) | |
6038 | / (unsigned)BITS_PER_UNIT); | |
6039 | ||
6040 | assemble_zeros ((next - here) | |
6041 | * (unsigned)BITS_PER_UNIT | |
6042 | / (unsigned)BITS_PER_UNIT); | |
b62acd60 RS |
6043 | } |
6044 | } | |
48dd3a7c RK |
6045 | output_constant (digest_init (type, value, |
6046 | require_constant_value, | |
6047 | require_constant_elements), | |
d11fdb45 | 6048 | int_size_in_bytes (type)); |
b62acd60 | 6049 | |
925d5bbf RS |
6050 | /* For a record or union, |
6051 | keep track of end position of last field. */ | |
6052 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6053 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
b62acd60 | 6054 | { |
b5ff0f70 RK |
6055 | tree temp = size_binop (PLUS_EXPR, DECL_FIELD_BITPOS (field), |
6056 | DECL_SIZE (field)); | |
b62acd60 RS |
6057 | TREE_INT_CST_LOW (constructor_bit_index) |
6058 | = TREE_INT_CST_LOW (temp); | |
6059 | TREE_INT_CST_HIGH (constructor_bit_index) | |
6060 | = TREE_INT_CST_HIGH (temp); | |
6061 | } | |
6062 | } | |
c2f4acb7 RS |
6063 | } |
6064 | ||
de520661 RS |
6065 | /* Advance the variable that indicates sequential elements output. */ |
6066 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
400fbf9f | 6067 | { |
de520661 RS |
6068 | tree tem = size_binop (PLUS_EXPR, constructor_unfilled_index, |
6069 | integer_one_node); | |
6070 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
6071 | = TREE_INT_CST_LOW (tem); | |
6072 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
6073 | = TREE_INT_CST_HIGH (tem); | |
6074 | } | |
6075 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
6076 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
6077 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
6078 | constructor_unfilled_fields = 0; | |
6079 | ||
6080 | /* Now output any pending elements which have become next. */ | |
6081 | if (pending) | |
6082 | output_pending_init_elements (0); | |
6083 | } | |
6084 | } | |
400fbf9f | 6085 | |
de520661 RS |
6086 | /* Output any pending elements which have become next. |
6087 | As we output elements, constructor_unfilled_{fields,index} | |
6088 | advances, which may cause other elements to become next; | |
6089 | if so, they too are output. | |
6090 | ||
6091 | If ALL is 0, we return when there are | |
6092 | no more pending elements to output now. | |
6093 | ||
6094 | If ALL is 1, we output space as necessary so that | |
6095 | we can output all the pending elements. */ | |
6096 | ||
6097 | static void | |
6098 | output_pending_init_elements (all) | |
6099 | int all; | |
6100 | { | |
6101 | tree tail; | |
6102 | tree next; | |
6103 | ||
6104 | retry: | |
6105 | ||
6106 | /* Look thru the whole pending list. | |
6107 | If we find an element that should be output now, | |
6108 | output it. Otherwise, set NEXT to the element | |
6109 | that comes first among those still pending. */ | |
6110 | ||
6111 | next = 0; | |
6112 | for (tail = constructor_pending_elts; tail; | |
6113 | tail = TREE_CHAIN (tail)) | |
6114 | { | |
6115 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6116 | { | |
6117 | if (tree_int_cst_equal (TREE_PURPOSE (tail), | |
6118 | constructor_unfilled_index)) | |
400fbf9f | 6119 | { |
ff3225e7 RK |
6120 | output_init_element (TREE_VALUE (tail), |
6121 | TREE_TYPE (constructor_type), | |
de520661 RS |
6122 | constructor_unfilled_index, 0); |
6123 | goto retry; | |
6124 | } | |
6125 | else if (tree_int_cst_lt (TREE_PURPOSE (tail), | |
6126 | constructor_unfilled_index)) | |
6127 | ; | |
6128 | else if (next == 0 | |
ff3225e7 | 6129 | || tree_int_cst_lt (TREE_PURPOSE (tail), next)) |
de520661 RS |
6130 | next = TREE_PURPOSE (tail); |
6131 | } | |
6132 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6133 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6134 | { | |
6135 | if (TREE_PURPOSE (tail) == constructor_unfilled_fields) | |
6136 | { | |
6137 | output_init_element (TREE_VALUE (tail), | |
6138 | TREE_TYPE (constructor_unfilled_fields), | |
6139 | constructor_unfilled_fields, | |
6140 | 0); | |
6141 | goto retry; | |
400fbf9f | 6142 | } |
281ec92f RS |
6143 | else if (constructor_unfilled_fields == 0 |
6144 | || tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)), | |
6145 | DECL_FIELD_BITPOS (constructor_unfilled_fields))) | |
de520661 RS |
6146 | ; |
6147 | else if (next == 0 | |
6148 | || tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)), | |
6149 | DECL_FIELD_BITPOS (next))) | |
6150 | next = TREE_PURPOSE (tail); | |
400fbf9f | 6151 | } |
de520661 RS |
6152 | } |
6153 | ||
6154 | /* Ordinarily return, but not if we want to output all | |
6155 | and there are elements left. */ | |
6156 | if (! (all && next != 0)) | |
6157 | return; | |
6158 | ||
6159 | /* Generate space up to the position of NEXT. */ | |
6160 | if (constructor_incremental) | |
6161 | { | |
6162 | tree filled; | |
9d5f3e49 | 6163 | tree nextpos_tree = size_int (0); |
400fbf9f | 6164 | |
de520661 RS |
6165 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
6166 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
400fbf9f | 6167 | { |
b5ff0f70 | 6168 | /* Find the last field written out, if any. */ |
de520661 RS |
6169 | for (tail = TYPE_FIELDS (constructor_type); tail; |
6170 | tail = TREE_CHAIN (tail)) | |
6171 | if (TREE_CHAIN (tail) == constructor_unfilled_fields) | |
6172 | break; | |
b5ff0f70 RK |
6173 | |
6174 | if (tail) | |
6175 | /* Find the offset of the end of that field. */ | |
6176 | filled = size_binop (CEIL_DIV_EXPR, | |
6177 | size_binop (PLUS_EXPR, | |
6178 | DECL_FIELD_BITPOS (tail), | |
6179 | DECL_SIZE (tail)), | |
6180 | size_int (BITS_PER_UNIT)); | |
6181 | else | |
6182 | filled = size_int (0); | |
6183 | ||
de520661 RS |
6184 | nextpos_tree = size_binop (CEIL_DIV_EXPR, |
6185 | DECL_FIELD_BITPOS (next), | |
6186 | size_int (BITS_PER_UNIT)); | |
b5ff0f70 RK |
6187 | |
6188 | TREE_INT_CST_HIGH (constructor_bit_index) | |
6189 | = TREE_INT_CST_HIGH (DECL_FIELD_BITPOS (next)); | |
6190 | TREE_INT_CST_LOW (constructor_bit_index) | |
6191 | = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (next)); | |
de520661 | 6192 | constructor_unfilled_fields = next; |
400fbf9f | 6193 | } |
de520661 | 6194 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
400fbf9f | 6195 | { |
de520661 RS |
6196 | filled = size_binop (MULT_EXPR, constructor_unfilled_index, |
6197 | size_in_bytes (TREE_TYPE (constructor_type))); | |
6198 | nextpos_tree | |
6199 | = size_binop (MULT_EXPR, next, | |
6200 | size_in_bytes (TREE_TYPE (constructor_type))); | |
6201 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
6202 | = TREE_INT_CST_LOW (next); | |
6203 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
6204 | = TREE_INT_CST_HIGH (next); | |
400fbf9f | 6205 | } |
de520661 RS |
6206 | else |
6207 | filled = 0; | |
400fbf9f | 6208 | |
de520661 | 6209 | if (filled) |
fe67cf58 | 6210 | { |
de520661 RS |
6211 | int nextpos = TREE_INT_CST_LOW (nextpos_tree); |
6212 | ||
6213 | assemble_zeros (nextpos - TREE_INT_CST_LOW (filled)); | |
fe67cf58 | 6214 | } |
de520661 | 6215 | } |
94ba5069 RS |
6216 | else |
6217 | { | |
6218 | /* If it's not incremental, just skip over the gap, | |
6219 | so that after jumping to retry we will output the next | |
6220 | successive element. */ | |
6221 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
6222 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6223 | constructor_unfilled_fields = next; | |
6224 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
6225 | { | |
6226 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
6227 | = TREE_INT_CST_LOW (next); | |
6228 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
6229 | = TREE_INT_CST_HIGH (next); | |
6230 | } | |
6231 | } | |
de520661 RS |
6232 | |
6233 | goto retry; | |
6234 | } | |
6235 | \f | |
6236 | /* Add one non-braced element to the current constructor level. | |
6237 | This adjusts the current position within the constructor's type. | |
6238 | This may also start or terminate implicit levels | |
6239 | to handle a partly-braced initializer. | |
6240 | ||
6241 | Once this has found the correct level for the new element, | |
6242 | it calls output_init_element. | |
6243 | ||
6244 | Note: if we are incrementally outputting this constructor, | |
6245 | this function may be called with a null argument | |
6246 | representing a sub-constructor that was already incrementally output. | |
6247 | When that happens, we output nothing, but we do the bookkeeping | |
6248 | to skip past that element of the current constructor. */ | |
6249 | ||
6250 | void | |
6251 | process_init_element (value) | |
6252 | tree value; | |
6253 | { | |
b62acd60 RS |
6254 | tree orig_value = value; |
6255 | int string_flag = value != 0 && TREE_CODE (value) == STRING_CST; | |
6256 | ||
790e9490 RS |
6257 | /* Handle superfluous braces around string cst as in |
6258 | char x[] = {"foo"}; */ | |
6259 | if (string_flag | |
d27c148b | 6260 | && constructor_type |
790e9490 | 6261 | && TREE_CODE (constructor_type) == ARRAY_TYPE |
61e215dd | 6262 | && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE |
790e9490 RS |
6263 | && integer_zerop (constructor_unfilled_index)) |
6264 | { | |
6265 | constructor_stack->replacement_value = value; | |
6266 | return; | |
6267 | } | |
6268 | ||
790e9490 RS |
6269 | if (constructor_stack->replacement_value != 0) |
6270 | { | |
6271 | error_init ("excess elements in struct initializer%s", | |
6272 | " after `%s'", NULL_PTR); | |
6273 | return; | |
6274 | } | |
6275 | ||
91fa3c30 RS |
6276 | /* Ignore elements of a brace group if it is entirely superfluous |
6277 | and has already been diagnosed. */ | |
6278 | if (constructor_type == 0) | |
6279 | return; | |
6280 | ||
de520661 RS |
6281 | /* If we've exhausted any levels that didn't have braces, |
6282 | pop them now. */ | |
6283 | while (constructor_stack->implicit) | |
6284 | { | |
6285 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6286 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6287 | && constructor_fields == 0) | |
6288 | process_init_element (pop_init_level (1)); | |
6289 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
ec0bc8b6 RK |
6290 | && (constructor_max_index == 0 |
6291 | || tree_int_cst_lt (constructor_max_index, | |
6292 | constructor_index))) | |
de520661 | 6293 | process_init_element (pop_init_level (1)); |
fe67cf58 | 6294 | else |
de520661 | 6295 | break; |
400fbf9f JW |
6296 | } |
6297 | ||
de520661 | 6298 | while (1) |
400fbf9f | 6299 | { |
de520661 | 6300 | if (TREE_CODE (constructor_type) == RECORD_TYPE) |
400fbf9f | 6301 | { |
de520661 RS |
6302 | tree fieldtype; |
6303 | enum tree_code fieldcode; | |
6304 | ||
6305 | if (constructor_fields == 0) | |
6306 | { | |
6307 | pedwarn_init ("excess elements in struct initializer%s", | |
6308 | " after `%s'", NULL_PTR); | |
6309 | break; | |
6310 | } | |
6311 | ||
1d33b2a9 JW |
6312 | fieldtype = TREE_TYPE (constructor_fields); |
6313 | if (fieldtype != error_mark_node) | |
6314 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
de520661 RS |
6315 | fieldcode = TREE_CODE (fieldtype); |
6316 | ||
b62acd60 RS |
6317 | /* Accept a string constant to initialize a subarray. */ |
6318 | if (value != 0 | |
6319 | && fieldcode == ARRAY_TYPE | |
6320 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6321 | && string_flag) | |
6322 | value = orig_value; | |
6323 | /* Otherwise, if we have come to a subaggregate, | |
6324 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6325 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6326 | && value != error_mark_node |
b62acd60 RS |
6327 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype |
6328 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6329 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6330 | { |
6331 | push_init_level (1); | |
6332 | continue; | |
6333 | } | |
6334 | ||
6335 | if (value) | |
6336 | { | |
19d76e60 | 6337 | push_member_name (constructor_fields); |
de520661 RS |
6338 | output_init_element (value, fieldtype, constructor_fields, 1); |
6339 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6340 | } | |
6341 | else | |
b62acd60 RS |
6342 | /* Do the bookkeeping for an element that was |
6343 | directly output as a constructor. */ | |
6344 | { | |
6345 | /* For a record, keep track of end position of last field. */ | |
6346 | tree temp = size_binop (PLUS_EXPR, | |
6347 | DECL_FIELD_BITPOS (constructor_fields), | |
6348 | DECL_SIZE (constructor_fields)); | |
6349 | TREE_INT_CST_LOW (constructor_bit_index) | |
6350 | = TREE_INT_CST_LOW (temp); | |
6351 | TREE_INT_CST_HIGH (constructor_bit_index) | |
6352 | = TREE_INT_CST_HIGH (temp); | |
6353 | ||
6354 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
6355 | } | |
de520661 RS |
6356 | |
6357 | constructor_fields = TREE_CHAIN (constructor_fields); | |
abc95ed3 | 6358 | /* Skip any nameless bit fields at the beginning. */ |
ef86d2a6 RK |
6359 | while (constructor_fields != 0 |
6360 | && DECL_C_BIT_FIELD (constructor_fields) | |
fc623854 RS |
6361 | && DECL_NAME (constructor_fields) == 0) |
6362 | constructor_fields = TREE_CHAIN (constructor_fields); | |
de520661 | 6363 | break; |
400fbf9f | 6364 | } |
de520661 | 6365 | if (TREE_CODE (constructor_type) == UNION_TYPE) |
400fbf9f | 6366 | { |
de520661 RS |
6367 | tree fieldtype; |
6368 | enum tree_code fieldcode; | |
6369 | ||
6370 | if (constructor_fields == 0) | |
6371 | { | |
6372 | pedwarn_init ("excess elements in union initializer%s", | |
6373 | " after `%s'", NULL_PTR); | |
6374 | break; | |
6375 | } | |
6376 | ||
1d33b2a9 JW |
6377 | fieldtype = TREE_TYPE (constructor_fields); |
6378 | if (fieldtype != error_mark_node) | |
6379 | fieldtype = TYPE_MAIN_VARIANT (fieldtype); | |
de520661 RS |
6380 | fieldcode = TREE_CODE (fieldtype); |
6381 | ||
b62acd60 RS |
6382 | /* Accept a string constant to initialize a subarray. */ |
6383 | if (value != 0 | |
6384 | && fieldcode == ARRAY_TYPE | |
6385 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6386 | && string_flag) | |
6387 | value = orig_value; | |
6388 | /* Otherwise, if we have come to a subaggregate, | |
6389 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6390 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6391 | && value != error_mark_node |
b62acd60 RS |
6392 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype |
6393 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6394 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6395 | { |
6396 | push_init_level (1); | |
6397 | continue; | |
6398 | } | |
6399 | ||
6400 | if (value) | |
6401 | { | |
19d76e60 | 6402 | push_member_name (constructor_fields); |
de520661 RS |
6403 | output_init_element (value, fieldtype, constructor_fields, 1); |
6404 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6405 | } | |
6406 | else | |
94ba5069 RS |
6407 | /* Do the bookkeeping for an element that was |
6408 | directly output as a constructor. */ | |
6409 | { | |
6410 | TREE_INT_CST_LOW (constructor_bit_index) | |
6411 | = TREE_INT_CST_LOW (DECL_SIZE (constructor_fields)); | |
6412 | TREE_INT_CST_HIGH (constructor_bit_index) | |
6413 | = TREE_INT_CST_HIGH (DECL_SIZE (constructor_fields)); | |
6414 | ||
6415 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
6416 | } | |
de520661 RS |
6417 | |
6418 | constructor_fields = 0; | |
6419 | break; | |
400fbf9f | 6420 | } |
de520661 RS |
6421 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
6422 | { | |
6423 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6424 | enum tree_code eltcode = TREE_CODE (elttype); | |
6425 | ||
b62acd60 RS |
6426 | /* Accept a string constant to initialize a subarray. */ |
6427 | if (value != 0 | |
6428 | && eltcode == ARRAY_TYPE | |
6429 | && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE | |
6430 | && string_flag) | |
6431 | value = orig_value; | |
6432 | /* Otherwise, if we have come to a subaggregate, | |
6433 | and we don't have an element of its type, push into it. */ | |
cc77d4d5 | 6434 | else if (value != 0 && !constructor_no_implicit |
ee7204ee | 6435 | && value != error_mark_node |
b62acd60 RS |
6436 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype |
6437 | && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE | |
6438 | || eltcode == UNION_TYPE)) | |
de520661 RS |
6439 | { |
6440 | push_init_level (1); | |
6441 | continue; | |
6442 | } | |
6443 | ||
6444 | if (constructor_max_index != 0 | |
6445 | && tree_int_cst_lt (constructor_max_index, constructor_index)) | |
6446 | { | |
6447 | pedwarn_init ("excess elements in array initializer%s", | |
6448 | " after `%s'", NULL_PTR); | |
6449 | break; | |
6450 | } | |
400fbf9f | 6451 | |
0f41302f | 6452 | /* In the case of [LO .. HI] = VALUE, only evaluate VALUE once. */ |
333a5dae | 6453 | if (constructor_range_end) |
ee2990e7 RK |
6454 | { |
6455 | if (constructor_max_index != 0 | |
6456 | && tree_int_cst_lt (constructor_max_index, | |
6457 | constructor_range_end)) | |
6458 | { | |
6459 | pedwarn_init ("excess elements in array initializer%s", | |
6460 | " after `%s'", NULL_PTR); | |
6461 | TREE_INT_CST_HIGH (constructor_range_end) | |
6462 | = TREE_INT_CST_HIGH (constructor_max_index); | |
6463 | TREE_INT_CST_LOW (constructor_range_end) | |
6464 | = TREE_INT_CST_LOW (constructor_max_index); | |
6465 | } | |
6466 | ||
6467 | value = save_expr (value); | |
6468 | } | |
333a5dae | 6469 | |
de520661 RS |
6470 | /* Now output the actual element. |
6471 | Ordinarily, output once. | |
6472 | If there is a range, repeat it till we advance past the range. */ | |
6473 | do | |
6474 | { | |
6475 | tree tem; | |
d45cf215 | 6476 | |
de520661 RS |
6477 | if (value) |
6478 | { | |
6479 | push_array_bounds (TREE_INT_CST_LOW (constructor_index)); | |
6480 | output_init_element (value, elttype, constructor_index, 1); | |
6481 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6482 | } | |
d45cf215 | 6483 | |
de520661 RS |
6484 | tem = size_binop (PLUS_EXPR, constructor_index, |
6485 | integer_one_node); | |
ee2990e7 RK |
6486 | TREE_INT_CST_LOW (constructor_index) = TREE_INT_CST_LOW (tem); |
6487 | TREE_INT_CST_HIGH (constructor_index) = TREE_INT_CST_HIGH (tem); | |
de520661 RS |
6488 | |
6489 | if (!value) | |
6490 | /* If we are doing the bookkeeping for an element that was | |
6491 | directly output as a constructor, | |
6492 | we must update constructor_unfilled_index. */ | |
6493 | { | |
6494 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
6495 | = TREE_INT_CST_LOW (constructor_index); | |
6496 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
6497 | = TREE_INT_CST_HIGH (constructor_index); | |
6498 | } | |
6499 | } | |
6500 | while (! (constructor_range_end == 0 | |
6501 | || tree_int_cst_lt (constructor_range_end, | |
6502 | constructor_index))); | |
400fbf9f | 6503 | |
de520661 RS |
6504 | break; |
6505 | } | |
6506 | ||
6507 | /* Handle the sole element allowed in a braced initializer | |
6508 | for a scalar variable. */ | |
6509 | if (constructor_fields == 0) | |
6510 | { | |
6511 | pedwarn_init ("excess elements in scalar initializer%s", | |
6512 | " after `%s'", NULL_PTR); | |
6513 | break; | |
6514 | } | |
6515 | ||
6516 | if (value) | |
6517 | output_init_element (value, constructor_type, NULL_TREE, 1); | |
6518 | constructor_fields = 0; | |
6519 | break; | |
fe67cf58 | 6520 | } |
de520661 RS |
6521 | |
6522 | /* If the (lexically) previous elments are not now saved, | |
6523 | we can discard the storage for them. */ | |
8d75e509 RK |
6524 | if (constructor_incremental && constructor_pending_elts == 0 && value != 0 |
6525 | && constructor_stack == 0) | |
de520661 | 6526 | clear_momentary (); |
400fbf9f JW |
6527 | } |
6528 | \f | |
6529 | /* Expand an ASM statement with operands, handling output operands | |
6530 | that are not variables or INDIRECT_REFS by transforming such | |
6531 | cases into cases that expand_asm_operands can handle. | |
6532 | ||
6533 | Arguments are same as for expand_asm_operands. */ | |
6534 | ||
6535 | void | |
6536 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
6537 | tree string, outputs, inputs, clobbers; | |
6538 | int vol; | |
6539 | char *filename; | |
6540 | int line; | |
6541 | { | |
6542 | int noutputs = list_length (outputs); | |
6543 | register int i; | |
6544 | /* o[I] is the place that output number I should be written. */ | |
6545 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
6546 | register tree tail; | |
6547 | ||
6548 | if (TREE_CODE (string) == ADDR_EXPR) | |
6549 | string = TREE_OPERAND (string, 0); | |
6550 | if (TREE_CODE (string) != STRING_CST) | |
6551 | { | |
6552 | error ("asm template is not a string constant"); | |
6553 | return; | |
6554 | } | |
6555 | ||
7b6327ae | 6556 | /* Record the contents of OUTPUTS before it is modified. */ |
400fbf9f JW |
6557 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) |
6558 | o[i] = TREE_VALUE (tail); | |
6559 | ||
6560 | /* Perform default conversions on array and function inputs. */ | |
6561 | /* Don't do this for other types-- | |
6562 | it would screw up operands expected to be in memory. */ | |
6563 | for (i = 0, tail = inputs; tail; tail = TREE_CHAIN (tail), i++) | |
6564 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE | |
6565 | || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE) | |
6566 | TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail)); | |
6567 | ||
6568 | /* Generate the ASM_OPERANDS insn; | |
6569 | store into the TREE_VALUEs of OUTPUTS some trees for | |
6570 | where the values were actually stored. */ | |
6571 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
6572 | ||
6573 | /* Copy all the intermediate outputs into the specified outputs. */ | |
6574 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6575 | { | |
6576 | if (o[i] != TREE_VALUE (tail)) | |
6577 | { | |
6578 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
6579 | 0, VOIDmode, 0); | |
6580 | free_temp_slots (); | |
6581 | } | |
6582 | /* Detect modification of read-only values. | |
6583 | (Otherwise done by build_modify_expr.) */ | |
6584 | else | |
6585 | { | |
6586 | tree type = TREE_TYPE (o[i]); | |
a43ea319 RK |
6587 | if (TREE_READONLY (o[i]) |
6588 | || TYPE_READONLY (type) | |
400fbf9f JW |
6589 | || ((TREE_CODE (type) == RECORD_TYPE |
6590 | || TREE_CODE (type) == UNION_TYPE) | |
6591 | && C_TYPE_FIELDS_READONLY (type))) | |
6592 | readonly_warning (o[i], "modification by `asm'"); | |
6593 | } | |
6594 | } | |
6595 | ||
6596 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
6597 | emit_queue (); | |
6598 | } | |
6599 | \f | |
6600 | /* Expand a C `return' statement. | |
6601 | RETVAL is the expression for what to return, | |
6602 | or a null pointer for `return;' with no value. */ | |
6603 | ||
6604 | void | |
6605 | c_expand_return (retval) | |
6606 | tree retval; | |
6607 | { | |
6608 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
6609 | ||
6610 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
08bf538e | 6611 | warning ("function declared `noreturn' has a `return' statement"); |
400fbf9f JW |
6612 | |
6613 | if (!retval) | |
6614 | { | |
6615 | current_function_returns_null = 1; | |
6616 | if (warn_return_type && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
6617 | warning ("`return' with no value, in function returning non-void"); | |
6618 | expand_null_return (); | |
6619 | } | |
6620 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) | |
6621 | { | |
6622 | current_function_returns_null = 1; | |
6623 | if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
6624 | pedwarn ("`return' with a value, in function returning void"); | |
6625 | expand_return (retval); | |
6626 | } | |
6627 | else | |
6628 | { | |
6629 | tree t = convert_for_assignment (valtype, retval, "return", | |
9b7267b8 | 6630 | NULL_TREE, NULL_TREE, 0); |
400fbf9f | 6631 | tree res = DECL_RESULT (current_function_decl); |
88a3dbc1 | 6632 | tree inner; |
70768eda RK |
6633 | |
6634 | if (t == error_mark_node) | |
6635 | return; | |
6636 | ||
88a3dbc1 RK |
6637 | inner = t = convert (TREE_TYPE (res), t); |
6638 | ||
6639 | /* Strip any conversions, additions, and subtractions, and see if | |
6640 | we are returning the address of a local variable. Warn if so. */ | |
abe80e6d | 6641 | while (1) |
88a3dbc1 | 6642 | { |
abe80e6d RK |
6643 | switch (TREE_CODE (inner)) |
6644 | { | |
6645 | case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR: | |
6646 | case PLUS_EXPR: | |
6647 | inner = TREE_OPERAND (inner, 0); | |
6648 | continue; | |
6649 | ||
6650 | case MINUS_EXPR: | |
6651 | /* If the second operand of the MINUS_EXPR has a pointer | |
6652 | type (or is converted from it), this may be valid, so | |
6653 | don't give a warning. */ | |
6654 | { | |
6655 | tree op1 = TREE_OPERAND (inner, 1); | |
6656 | ||
6657 | while (! POINTER_TYPE_P (TREE_TYPE (op1)) | |
6658 | && (TREE_CODE (op1) == NOP_EXPR | |
6659 | || TREE_CODE (op1) == NON_LVALUE_EXPR | |
6660 | || TREE_CODE (op1) == CONVERT_EXPR)) | |
6661 | op1 = TREE_OPERAND (op1, 0); | |
6662 | ||
6663 | if (POINTER_TYPE_P (TREE_TYPE (op1))) | |
6664 | break; | |
88a3dbc1 | 6665 | |
abe80e6d RK |
6666 | inner = TREE_OPERAND (inner, 0); |
6667 | continue; | |
6668 | } | |
6669 | ||
6670 | case ADDR_EXPR: | |
6671 | inner = TREE_OPERAND (inner, 0); | |
88a3dbc1 | 6672 | |
abe80e6d RK |
6673 | while (TREE_CODE_CLASS (TREE_CODE (inner)) == 'r') |
6674 | inner = TREE_OPERAND (inner, 0); | |
6675 | ||
6676 | if (TREE_CODE (inner) == VAR_DECL | |
6677 | && ! DECL_EXTERNAL (inner) | |
6678 | && ! TREE_STATIC (inner) | |
6679 | && DECL_CONTEXT (inner) == current_function_decl) | |
6680 | warning ("function returns address of local variable"); | |
6681 | break; | |
e9a25f70 JL |
6682 | |
6683 | default: | |
6684 | break; | |
abe80e6d RK |
6685 | } |
6686 | ||
6687 | break; | |
88a3dbc1 RK |
6688 | } |
6689 | ||
6690 | t = build (MODIFY_EXPR, TREE_TYPE (res), res, t); | |
1c2a9b35 | 6691 | TREE_SIDE_EFFECTS (t) = 1; |
400fbf9f JW |
6692 | expand_return (t); |
6693 | current_function_returns_value = 1; | |
6694 | } | |
6695 | } | |
6696 | \f | |
6697 | /* Start a C switch statement, testing expression EXP. | |
6698 | Return EXP if it is valid, an error node otherwise. */ | |
6699 | ||
6700 | tree | |
6701 | c_expand_start_case (exp) | |
6702 | tree exp; | |
6703 | { | |
6704 | register enum tree_code code = TREE_CODE (TREE_TYPE (exp)); | |
6705 | tree type = TREE_TYPE (exp); | |
6706 | ||
6707 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
6708 | { | |
6709 | error ("switch quantity not an integer"); | |
6710 | exp = error_mark_node; | |
6711 | } | |
6712 | else | |
6713 | { | |
6714 | tree index; | |
6cb72a7d | 6715 | type = TYPE_MAIN_VARIANT (TREE_TYPE (exp)); |
400fbf9f JW |
6716 | |
6717 | if (warn_traditional | |
6cb72a7d RS |
6718 | && (type == long_integer_type_node |
6719 | || type == long_unsigned_type_node)) | |
400fbf9f JW |
6720 | pedwarn ("`long' switch expression not converted to `int' in ANSI C"); |
6721 | ||
6722 | exp = default_conversion (exp); | |
6723 | type = TREE_TYPE (exp); | |
8d9bfdc5 | 6724 | index = get_unwidened (exp, NULL_TREE); |
400fbf9f JW |
6725 | /* We can't strip a conversion from a signed type to an unsigned, |
6726 | because if we did, int_fits_type_p would do the wrong thing | |
6727 | when checking case values for being in range, | |
6728 | and it's too hard to do the right thing. */ | |
6729 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
6730 | == TREE_UNSIGNED (TREE_TYPE (index))) | |
6731 | exp = index; | |
6732 | } | |
6733 | ||
6734 | expand_start_case (1, exp, type, "switch statement"); | |
6735 | ||
6736 | return exp; | |
6737 | } |