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400fbf9f JW |
1 | /* Build expressions with type checking for C compiler. |
2 | Copyright (C) 1987, 1988, 1989, 1992 Free Software Foundation, Inc. | |
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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | /* This file is part of the C front end. | |
22 | It contains routines to build C expressions given their operands, | |
23 | including computing the types of the result, C-specific error checks, | |
24 | and some optimization. | |
25 | ||
26 | There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, | |
27 | and to process initializations in declarations (since they work | |
28 | like a strange sort of assignment). */ | |
29 | ||
30 | #include "config.h" | |
31 | #include <stdio.h> | |
32 | #include "tree.h" | |
33 | #include "c-tree.h" | |
34 | #include "flags.h" | |
35 | ||
103b7b17 RS |
36 | /* Nonzero if we've already printed a "partly bracketed initializer" |
37 | message within this initializer. */ | |
38 | static int partial_bracket_mentioned = 0; | |
39 | ||
3845b542 MS |
40 | extern char *index (); |
41 | extern char *rindex (); | |
42 | ||
400fbf9f JW |
43 | int mark_addressable (); |
44 | static tree convert_for_assignment (); | |
45 | static void warn_for_assignment (); | |
46 | static int function_types_compatible_p (); | |
47 | static int type_lists_compatible_p (); | |
805f961c | 48 | int self_promoting_args_p (); |
400fbf9f JW |
49 | static int self_promoting_type_p (); |
50 | static int comp_target_types (); | |
51 | static tree pointer_int_sum (); | |
52 | static tree pointer_diff (); | |
53 | static tree convert_sequence (); | |
54 | static tree unary_complex_lvalue (); | |
55 | static tree process_init_constructor (); | |
56 | static tree convert_arguments (); | |
d45cf215 | 57 | static char *get_spelling (); |
de520661 | 58 | static tree digest_init (); |
400fbf9f JW |
59 | static void pedantic_lvalue_warning (); |
60 | tree truthvalue_conversion (); | |
61 | void incomplete_type_error (); | |
62 | void readonly_warning (); | |
82bde854 MM |
63 | static tree internal_build_compound_expr (); |
64 | ||
de520661 | 65 | void process_init_element (); |
400fbf9f JW |
66 | \f |
67 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
68 | does not have an incomplete type. (That includes void types.) */ | |
69 | ||
70 | tree | |
71 | require_complete_type (value) | |
72 | tree value; | |
73 | { | |
74 | tree type = TREE_TYPE (value); | |
75 | ||
76 | /* First, detect a valid value with a complete type. */ | |
77 | if (TYPE_SIZE (type) != 0 | |
78 | && type != void_type_node) | |
79 | return value; | |
80 | ||
81 | incomplete_type_error (value, type); | |
82 | return error_mark_node; | |
83 | } | |
84 | ||
85 | /* Print an error message for invalid use of an incomplete type. | |
86 | VALUE is the expression that was used (or 0 if that isn't known) | |
87 | and TYPE is the type that was invalid. */ | |
88 | ||
89 | void | |
90 | incomplete_type_error (value, type) | |
91 | tree value; | |
92 | tree type; | |
93 | { | |
94 | char *errmsg; | |
95 | ||
96 | /* Avoid duplicate error message. */ | |
97 | if (TREE_CODE (type) == ERROR_MARK) | |
98 | return; | |
99 | ||
100 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
101 | || TREE_CODE (value) == PARM_DECL)) | |
102 | error ("`%s' has an incomplete type", | |
103 | IDENTIFIER_POINTER (DECL_NAME (value))); | |
104 | else | |
105 | { | |
106 | retry: | |
107 | /* We must print an error message. Be clever about what it says. */ | |
108 | ||
109 | switch (TREE_CODE (type)) | |
110 | { | |
111 | case RECORD_TYPE: | |
112 | errmsg = "invalid use of undefined type `struct %s'"; | |
113 | break; | |
114 | ||
115 | case UNION_TYPE: | |
116 | errmsg = "invalid use of undefined type `union %s'"; | |
117 | break; | |
118 | ||
119 | case ENUMERAL_TYPE: | |
120 | errmsg = "invalid use of undefined type `enum %s'"; | |
121 | break; | |
122 | ||
123 | case VOID_TYPE: | |
124 | error ("invalid use of void expression"); | |
125 | return; | |
126 | ||
127 | case ARRAY_TYPE: | |
128 | if (TYPE_DOMAIN (type)) | |
129 | { | |
130 | type = TREE_TYPE (type); | |
131 | goto retry; | |
132 | } | |
133 | error ("invalid use of array with unspecified bounds"); | |
134 | return; | |
135 | ||
136 | default: | |
137 | abort (); | |
138 | } | |
139 | ||
140 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
141 | error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
142 | else | |
143 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
144 | error ("invalid use of incomplete typedef `%s'", | |
145 | IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
146 | } | |
147 | } | |
148 | ||
149 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
150 | as well as those of TYPE. */ | |
151 | ||
152 | static tree | |
153 | qualify_type (type, like) | |
154 | tree type, like; | |
155 | { | |
156 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
157 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
158 | return c_build_type_variant (type, constflag, volflag); | |
159 | } | |
160 | \f | |
161 | /* Return the common type of two types. | |
162 | We assume that comptypes has already been done and returned 1; | |
6cb72a7d RS |
163 | if that isn't so, this may crash. In particular, we assume that qualifiers |
164 | match. | |
400fbf9f JW |
165 | |
166 | This is the type for the result of most arithmetic operations | |
6cb72a7d | 167 | if the operands have the given two types. */ |
400fbf9f JW |
168 | |
169 | tree | |
170 | common_type (t1, t2) | |
171 | tree t1, t2; | |
172 | { | |
173 | register enum tree_code code1; | |
174 | register enum tree_code code2; | |
175 | ||
176 | /* Save time if the two types are the same. */ | |
177 | ||
178 | if (t1 == t2) return t1; | |
179 | ||
180 | /* If one type is nonsense, use the other. */ | |
181 | if (t1 == error_mark_node) | |
182 | return t2; | |
183 | if (t2 == error_mark_node) | |
184 | return t1; | |
185 | ||
186 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
187 | ||
188 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
189 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
190 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
191 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
192 | ||
193 | code1 = TREE_CODE (t1); | |
194 | code2 = TREE_CODE (t2); | |
195 | ||
b6a10c9f RS |
196 | /* If one type is complex, form the common type |
197 | of the non-complex components, | |
198 | then make that complex. */ | |
199 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
200 | { | |
201 | tree subtype1, subtype2, subtype; | |
202 | if (code1 == COMPLEX_TYPE) | |
203 | subtype1 = TREE_TYPE (t1); | |
204 | else | |
205 | subtype1 = t1; | |
206 | if (code2 == COMPLEX_TYPE) | |
207 | subtype2 = TREE_TYPE (t2); | |
208 | else | |
209 | subtype2 = t2; | |
210 | subtype = common_type (subtype1, subtype2); | |
211 | return build_complex_type (subtype); | |
212 | } | |
213 | ||
400fbf9f JW |
214 | switch (code1) |
215 | { | |
216 | case INTEGER_TYPE: | |
217 | case REAL_TYPE: | |
218 | /* If only one is real, use it as the result. */ | |
219 | ||
220 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
221 | return t1; | |
222 | ||
223 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
224 | return t2; | |
225 | ||
226 | /* Both real or both integers; use the one with greater precision. */ | |
227 | ||
228 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
229 | return t1; | |
230 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) | |
231 | return t2; | |
232 | ||
233 | /* Same precision. Prefer longs to ints even when same size. */ | |
234 | ||
36618528 RS |
235 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
236 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
400fbf9f JW |
237 | return long_unsigned_type_node; |
238 | ||
36618528 RS |
239 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node |
240 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
400fbf9f JW |
241 | { |
242 | /* But preserve unsignedness from the other type, | |
243 | since long cannot hold all the values of an unsigned int. */ | |
244 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
245 | return long_unsigned_type_node; | |
246 | return long_integer_type_node; | |
247 | } | |
248 | ||
249 | /* Otherwise prefer the unsigned one. */ | |
250 | ||
251 | if (TREE_UNSIGNED (t1)) | |
252 | return t1; | |
253 | else return t2; | |
254 | ||
255 | case POINTER_TYPE: | |
400fbf9f JW |
256 | /* For two pointers, do this recursively on the target type, |
257 | and combine the qualifiers of the two types' targets. */ | |
8706edbc RS |
258 | /* This code was turned off; I don't know why. |
259 | But ANSI C specifies doing this with the qualifiers. | |
260 | So I turned it on again. */ | |
400fbf9f JW |
261 | { |
262 | tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)), | |
263 | TYPE_MAIN_VARIANT (TREE_TYPE (t2))); | |
264 | int constp | |
265 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
266 | int volatilep | |
267 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
268 | return build_pointer_type (c_build_type_variant (target, constp, volatilep)); | |
269 | } | |
8706edbc | 270 | #if 0 |
400fbf9f | 271 | return build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); |
8706edbc | 272 | #endif |
400fbf9f JW |
273 | |
274 | case ARRAY_TYPE: | |
275 | { | |
276 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
277 | /* Save space: see if the result is identical to one of the args. */ | |
278 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
279 | return t1; | |
280 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) | |
281 | return t2; | |
282 | /* Merge the element types, and have a size if either arg has one. */ | |
283 | return build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); | |
284 | } | |
285 | ||
286 | case FUNCTION_TYPE: | |
287 | /* Function types: prefer the one that specified arg types. | |
288 | If both do, merge the arg types. Also merge the return types. */ | |
289 | { | |
290 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
291 | tree p1 = TYPE_ARG_TYPES (t1); | |
292 | tree p2 = TYPE_ARG_TYPES (t2); | |
293 | int len; | |
294 | tree newargs, n; | |
295 | int i; | |
296 | ||
297 | /* Save space: see if the result is identical to one of the args. */ | |
298 | if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2)) | |
299 | return t1; | |
300 | if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1)) | |
301 | return t2; | |
302 | ||
303 | /* Simple way if one arg fails to specify argument types. */ | |
304 | if (TYPE_ARG_TYPES (t1) == 0) | |
305 | return build_function_type (valtype, TYPE_ARG_TYPES (t2)); | |
306 | if (TYPE_ARG_TYPES (t2) == 0) | |
307 | return build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
308 | ||
309 | /* If both args specify argument types, we must merge the two | |
310 | lists, argument by argument. */ | |
311 | ||
312 | len = list_length (p1); | |
313 | newargs = 0; | |
314 | ||
315 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 316 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
317 | |
318 | n = newargs; | |
319 | ||
320 | for (; p1; | |
321 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
322 | { | |
323 | /* A null type means arg type is not specified. | |
324 | Take whatever the other function type has. */ | |
325 | if (TREE_VALUE (p1) == 0) | |
326 | { | |
327 | TREE_VALUE (n) = TREE_VALUE (p2); | |
328 | goto parm_done; | |
329 | } | |
330 | if (TREE_VALUE (p2) == 0) | |
331 | { | |
332 | TREE_VALUE (n) = TREE_VALUE (p1); | |
333 | goto parm_done; | |
334 | } | |
335 | ||
336 | /* Given wait (union {union wait *u; int *i} *) | |
337 | and wait (union wait *), | |
338 | prefer union wait * as type of parm. */ | |
339 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
340 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
341 | { | |
342 | tree memb; | |
343 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); | |
344 | memb; memb = TREE_CHAIN (memb)) | |
345 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2))) | |
346 | { | |
347 | TREE_VALUE (n) = TREE_VALUE (p2); | |
348 | if (pedantic) | |
349 | pedwarn ("function types not truly compatible in ANSI C"); | |
350 | goto parm_done; | |
351 | } | |
352 | } | |
353 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
354 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
355 | { | |
356 | tree memb; | |
357 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); | |
358 | memb; memb = TREE_CHAIN (memb)) | |
359 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1))) | |
360 | { | |
361 | TREE_VALUE (n) = TREE_VALUE (p1); | |
362 | if (pedantic) | |
363 | pedwarn ("function types not truly compatible in ANSI C"); | |
364 | goto parm_done; | |
365 | } | |
366 | } | |
367 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
368 | parm_done: ; | |
369 | } | |
370 | ||
371 | return build_function_type (valtype, newargs); | |
372 | } | |
373 | ||
374 | default: | |
375 | return t1; | |
376 | } | |
377 | ||
378 | } | |
379 | \f | |
380 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
381 | or various other operations. Return 2 if they are compatible | |
382 | but a warning may be needed if you use them together. */ | |
383 | ||
384 | int | |
385 | comptypes (type1, type2) | |
386 | tree type1, type2; | |
387 | { | |
388 | register tree t1 = type1; | |
389 | register tree t2 = type2; | |
390 | ||
391 | /* Suppress errors caused by previously reported errors. */ | |
392 | ||
393 | if (t1 == t2 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
394 | return 1; | |
395 | ||
396 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
397 | ||
398 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
399 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
400 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
401 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
402 | ||
403 | if (t1 == t2) | |
404 | return 1; | |
405 | ||
406 | /* Different classes of types can't be compatible. */ | |
407 | ||
408 | if (TREE_CODE (t1) != TREE_CODE (t2)) return 0; | |
409 | ||
410 | /* Qualifiers must match. */ | |
411 | ||
412 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
413 | return 0; | |
414 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) | |
415 | return 0; | |
416 | ||
08632da2 RS |
417 | /* Allow for two different type nodes which have essentially the same |
418 | definition. Note that we already checked for equality of the type | |
419 | type qualifiers (just above). */ | |
400fbf9f JW |
420 | |
421 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
422 | return 1; | |
423 | ||
424 | switch (TREE_CODE (t1)) | |
425 | { | |
426 | case POINTER_TYPE: | |
427 | return (TREE_TYPE (t1) == TREE_TYPE (t2) | |
428 | ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2))); | |
429 | ||
430 | case FUNCTION_TYPE: | |
431 | return function_types_compatible_p (t1, t2); | |
432 | ||
433 | case ARRAY_TYPE: | |
434 | { | |
435 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
436 | int val = 1; | |
437 | tree d1 = TYPE_DOMAIN (t1); | |
438 | tree d2 = TYPE_DOMAIN (t2); | |
439 | ||
440 | /* Target types must match incl. qualifiers. */ | |
441 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
442 | && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))) | |
443 | return 0; | |
444 | ||
445 | /* Sizes must match unless one is missing or variable. */ | |
446 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
447 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
448 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
449 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
450 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
451 | return val; | |
452 | ||
453 | return (((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) | |
454 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) | |
455 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
456 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
457 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
458 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
459 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
460 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))) | |
461 | ? val : 0); | |
462 | } | |
463 | ||
464 | case RECORD_TYPE: | |
392202b0 TW |
465 | if (maybe_objc_comptypes (t1, t2, 0) == 1) |
466 | return 1; | |
400fbf9f JW |
467 | } |
468 | return 0; | |
469 | } | |
470 | ||
471 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
472 | ignoring their qualifiers. */ | |
473 | ||
474 | static int | |
475 | comp_target_types (ttl, ttr) | |
476 | tree ttl, ttr; | |
477 | { | |
392202b0 | 478 | int val; |
8b40563c | 479 | |
392202b0 TW |
480 | /* Give maybe_objc_comptypes a crack at letting these types through. */ |
481 | if (val = maybe_objc_comptypes (ttl, ttr, 1) >= 0) | |
482 | return val; | |
8b40563c | 483 | |
392202b0 TW |
484 | val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)), |
485 | TYPE_MAIN_VARIANT (TREE_TYPE (ttr))); | |
8b40563c | 486 | |
400fbf9f JW |
487 | if (val == 2 && pedantic) |
488 | pedwarn ("types are not quite compatible"); | |
489 | return val; | |
490 | } | |
491 | \f | |
492 | /* Subroutines of `comptypes'. */ | |
493 | ||
494 | /* Return 1 if two function types F1 and F2 are compatible. | |
495 | If either type specifies no argument types, | |
496 | the other must specify a fixed number of self-promoting arg types. | |
497 | Otherwise, if one type specifies only the number of arguments, | |
498 | the other must specify that number of self-promoting arg types. | |
499 | Otherwise, the argument types must match. */ | |
500 | ||
501 | static int | |
502 | function_types_compatible_p (f1, f2) | |
503 | tree f1, f2; | |
504 | { | |
505 | tree args1, args2; | |
506 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
507 | int val = 1; | |
508 | int val1; | |
509 | ||
510 | if (!(TREE_TYPE (f1) == TREE_TYPE (f2) | |
511 | || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2))))) | |
512 | return 0; | |
513 | ||
514 | args1 = TYPE_ARG_TYPES (f1); | |
515 | args2 = TYPE_ARG_TYPES (f2); | |
516 | ||
517 | /* An unspecified parmlist matches any specified parmlist | |
518 | whose argument types don't need default promotions. */ | |
519 | ||
520 | if (args1 == 0) | |
521 | { | |
522 | if (!self_promoting_args_p (args2)) | |
523 | return 0; | |
524 | /* If one of these types comes from a non-prototype fn definition, | |
525 | compare that with the other type's arglist. | |
526 | If they don't match, ask for a warning (but no error). */ | |
527 | if (TYPE_ACTUAL_ARG_TYPES (f1) | |
528 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) | |
529 | val = 2; | |
530 | return val; | |
531 | } | |
532 | if (args2 == 0) | |
533 | { | |
534 | if (!self_promoting_args_p (args1)) | |
535 | return 0; | |
536 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
537 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) | |
538 | val = 2; | |
539 | return val; | |
540 | } | |
541 | ||
542 | /* Both types have argument lists: compare them and propagate results. */ | |
543 | val1 = type_lists_compatible_p (args1, args2); | |
544 | return val1 != 1 ? val1 : val; | |
545 | } | |
546 | ||
547 | /* Check two lists of types for compatibility, | |
548 | returning 0 for incompatible, 1 for compatible, | |
549 | or 2 for compatible with warning. */ | |
550 | ||
551 | static int | |
552 | type_lists_compatible_p (args1, args2) | |
553 | tree args1, args2; | |
554 | { | |
555 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
556 | int val = 1; | |
557 | int newval; | |
558 | ||
559 | while (1) | |
560 | { | |
561 | if (args1 == 0 && args2 == 0) | |
562 | return val; | |
563 | /* If one list is shorter than the other, | |
564 | they fail to match. */ | |
565 | if (args1 == 0 || args2 == 0) | |
566 | return 0; | |
567 | /* A null pointer instead of a type | |
568 | means there is supposed to be an argument | |
569 | but nothing is specified about what type it has. | |
570 | So match anything that self-promotes. */ | |
571 | if (TREE_VALUE (args1) == 0) | |
572 | { | |
573 | if (! self_promoting_type_p (TREE_VALUE (args2))) | |
574 | return 0; | |
575 | } | |
576 | else if (TREE_VALUE (args2) == 0) | |
577 | { | |
578 | if (! self_promoting_type_p (TREE_VALUE (args1))) | |
579 | return 0; | |
580 | } | |
581 | else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2)))) | |
582 | { | |
583 | /* Allow wait (union {union wait *u; int *i} *) | |
584 | and wait (union wait *) to be compatible. */ | |
585 | if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE | |
586 | && TYPE_NAME (TREE_VALUE (args1)) == 0 | |
587 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST | |
588 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)), | |
589 | TYPE_SIZE (TREE_VALUE (args2)))) | |
590 | { | |
591 | tree memb; | |
592 | for (memb = TYPE_FIELDS (TREE_VALUE (args1)); | |
593 | memb; memb = TREE_CHAIN (memb)) | |
594 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2))) | |
595 | break; | |
596 | if (memb == 0) | |
597 | return 0; | |
598 | } | |
599 | else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE | |
600 | && TYPE_NAME (TREE_VALUE (args2)) == 0 | |
601 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST | |
602 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)), | |
603 | TYPE_SIZE (TREE_VALUE (args1)))) | |
604 | { | |
605 | tree memb; | |
606 | for (memb = TYPE_FIELDS (TREE_VALUE (args2)); | |
607 | memb; memb = TREE_CHAIN (memb)) | |
608 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1))) | |
609 | break; | |
610 | if (memb == 0) | |
611 | return 0; | |
612 | } | |
613 | else | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /* comptypes said ok, but record if it said to warn. */ | |
618 | if (newval > val) | |
619 | val = newval; | |
620 | ||
621 | args1 = TREE_CHAIN (args1); | |
622 | args2 = TREE_CHAIN (args2); | |
623 | } | |
624 | } | |
625 | ||
626 | /* Return 1 if PARMS specifies a fixed number of parameters | |
627 | and none of their types is affected by default promotions. */ | |
628 | ||
805f961c | 629 | int |
400fbf9f JW |
630 | self_promoting_args_p (parms) |
631 | tree parms; | |
632 | { | |
633 | register tree t; | |
634 | for (t = parms; t; t = TREE_CHAIN (t)) | |
635 | { | |
636 | register tree type = TREE_VALUE (t); | |
637 | ||
638 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
639 | return 0; | |
640 | ||
d627ed1b RS |
641 | if (type == 0) |
642 | return 0; | |
643 | ||
6cb72a7d | 644 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
645 | return 0; |
646 | ||
d627ed1b | 647 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
648 | return 0; |
649 | } | |
650 | return 1; | |
651 | } | |
652 | ||
653 | /* Return 1 if TYPE is not affected by default promotions. */ | |
654 | ||
655 | static int | |
656 | self_promoting_type_p (type) | |
657 | tree type; | |
658 | { | |
6cb72a7d | 659 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
660 | return 0; |
661 | ||
d627ed1b | 662 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
663 | return 0; |
664 | ||
665 | return 1; | |
666 | } | |
667 | \f | |
668 | /* Return an unsigned type the same as TYPE in other respects. */ | |
669 | ||
670 | tree | |
671 | unsigned_type (type) | |
672 | tree type; | |
673 | { | |
6cb72a7d RS |
674 | tree type1 = TYPE_MAIN_VARIANT (type); |
675 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
400fbf9f | 676 | return unsigned_char_type_node; |
6cb72a7d | 677 | if (type1 == integer_type_node) |
400fbf9f | 678 | return unsigned_type_node; |
6cb72a7d | 679 | if (type1 == short_integer_type_node) |
400fbf9f | 680 | return short_unsigned_type_node; |
6cb72a7d | 681 | if (type1 == long_integer_type_node) |
400fbf9f | 682 | return long_unsigned_type_node; |
6cb72a7d | 683 | if (type1 == long_long_integer_type_node) |
400fbf9f JW |
684 | return long_long_unsigned_type_node; |
685 | return type; | |
686 | } | |
687 | ||
688 | /* Return a signed type the same as TYPE in other respects. */ | |
689 | ||
690 | tree | |
691 | signed_type (type) | |
692 | tree type; | |
693 | { | |
6cb72a7d RS |
694 | tree type1 = TYPE_MAIN_VARIANT (type); |
695 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
400fbf9f | 696 | return signed_char_type_node; |
6cb72a7d | 697 | if (type1 == unsigned_type_node) |
400fbf9f | 698 | return integer_type_node; |
6cb72a7d | 699 | if (type1 == short_unsigned_type_node) |
400fbf9f | 700 | return short_integer_type_node; |
6cb72a7d | 701 | if (type1 == long_unsigned_type_node) |
400fbf9f | 702 | return long_integer_type_node; |
6cb72a7d | 703 | if (type1 == long_long_unsigned_type_node) |
400fbf9f JW |
704 | return long_long_integer_type_node; |
705 | return type; | |
706 | } | |
707 | ||
708 | /* Return a type the same as TYPE except unsigned or | |
709 | signed according to UNSIGNEDP. */ | |
710 | ||
711 | tree | |
712 | signed_or_unsigned_type (unsignedp, type) | |
713 | int unsignedp; | |
714 | tree type; | |
715 | { | |
716 | if (TREE_CODE (type) != INTEGER_TYPE) | |
717 | return type; | |
718 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) | |
719 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
720 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
721 | return unsignedp ? unsigned_type_node : integer_type_node; | |
722 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
723 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
724 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
725 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
726 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
727 | return (unsignedp ? long_long_unsigned_type_node | |
728 | : long_long_integer_type_node); | |
729 | return type; | |
730 | } | |
731 | ||
732 | /* Compute the value of the `sizeof' operator. */ | |
733 | ||
734 | tree | |
735 | c_sizeof (type) | |
736 | tree type; | |
737 | { | |
738 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 739 | tree t; |
400fbf9f JW |
740 | |
741 | if (code == FUNCTION_TYPE) | |
742 | { | |
743 | if (pedantic || warn_pointer_arith) | |
744 | pedwarn ("sizeof applied to a function type"); | |
745 | return size_int (1); | |
746 | } | |
747 | if (code == VOID_TYPE) | |
748 | { | |
749 | if (pedantic || warn_pointer_arith) | |
750 | pedwarn ("sizeof applied to a void type"); | |
751 | return size_int (1); | |
752 | } | |
753 | if (code == ERROR_MARK) | |
754 | return size_int (1); | |
755 | if (TYPE_SIZE (type) == 0) | |
756 | { | |
757 | error ("sizeof applied to an incomplete type"); | |
758 | return size_int (0); | |
759 | } | |
760 | ||
761 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
762 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
763 | size_int (TYPE_PRECISION (char_type_node))); | |
fa427131 | 764 | /* size_binop does not put the constant in range, so do it now. */ |
10d5caec PE |
765 | if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) |
766 | TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; | |
f7c8fb3f | 767 | return t; |
400fbf9f JW |
768 | } |
769 | ||
770 | tree | |
771 | c_sizeof_nowarn (type) | |
772 | tree type; | |
773 | { | |
774 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 775 | tree t; |
400fbf9f JW |
776 | |
777 | if (code == FUNCTION_TYPE | |
778 | || code == VOID_TYPE | |
779 | || code == ERROR_MARK) | |
780 | return size_int (1); | |
781 | if (TYPE_SIZE (type) == 0) | |
782 | return size_int (0); | |
783 | ||
784 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
785 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
786 | size_int (TYPE_PRECISION (char_type_node))); | |
e58cd767 | 787 | force_fit_type (t, 0); |
f7c8fb3f | 788 | return t; |
400fbf9f JW |
789 | } |
790 | ||
791 | /* Compute the size to increment a pointer by. */ | |
792 | ||
793 | tree | |
794 | c_size_in_bytes (type) | |
795 | tree type; | |
796 | { | |
797 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 798 | tree t; |
400fbf9f JW |
799 | |
800 | if (code == FUNCTION_TYPE) | |
801 | return size_int (1); | |
802 | if (code == VOID_TYPE) | |
803 | return size_int (1); | |
804 | if (code == ERROR_MARK) | |
805 | return size_int (1); | |
806 | if (TYPE_SIZE (type) == 0) | |
807 | { | |
808 | error ("arithmetic on pointer to an incomplete type"); | |
809 | return size_int (1); | |
810 | } | |
811 | ||
812 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f | 813 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
400fbf9f | 814 | size_int (BITS_PER_UNIT)); |
e58cd767 | 815 | force_fit_type (t, 0); |
f7c8fb3f | 816 | return t; |
400fbf9f JW |
817 | } |
818 | ||
819 | /* Implement the __alignof keyword: Return the minimum required | |
820 | alignment of TYPE, measured in bytes. */ | |
821 | ||
822 | tree | |
823 | c_alignof (type) | |
824 | tree type; | |
825 | { | |
826 | enum tree_code code = TREE_CODE (type); | |
827 | ||
828 | if (code == FUNCTION_TYPE) | |
829 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
830 | ||
831 | if (code == VOID_TYPE || code == ERROR_MARK) | |
832 | return size_int (1); | |
833 | ||
834 | return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
835 | } | |
836 | \f | |
837 | /* Implement the __alignof keyword: Return the minimum required | |
838 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
839 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
840 | "aligned" __attribute__ specification). */ | |
9e9bd45d | 841 | |
400fbf9f JW |
842 | tree |
843 | c_alignof_expr (expr) | |
844 | tree expr; | |
845 | { | |
846 | if (TREE_CODE (expr) == VAR_DECL) | |
847 | return size_int (DECL_ALIGN (expr) / BITS_PER_UNIT); | |
848 | ||
849 | if (TREE_CODE (expr) == COMPONENT_REF | |
850 | && DECL_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
851 | { | |
852 | error ("`__alignof' applied to a bit-field"); | |
853 | return size_int (1); | |
854 | } | |
855 | else if (TREE_CODE (expr) == COMPONENT_REF | |
856 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) | |
857 | return size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT); | |
858 | ||
859 | if (TREE_CODE (expr) == INDIRECT_REF) | |
860 | { | |
861 | tree t = TREE_OPERAND (expr, 0); | |
862 | tree best = t; | |
863 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
864 | ||
865 | while (TREE_CODE (t) == NOP_EXPR | |
866 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) | |
867 | { | |
868 | int thisalign; | |
869 | ||
870 | t = TREE_OPERAND (t, 0); | |
871 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
872 | if (thisalign > bestalign) | |
873 | best = t, bestalign = thisalign; | |
874 | } | |
875 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
876 | } | |
877 | else | |
878 | return c_alignof (TREE_TYPE (expr)); | |
879 | } | |
880 | /* Return either DECL or its known constant value (if it has one). */ | |
881 | ||
882 | static tree | |
883 | decl_constant_value (decl) | |
884 | tree decl; | |
885 | { | |
886 | if (! TREE_PUBLIC (decl) | |
887 | /* Don't change a variable array bound or initial value to a constant | |
888 | in a place where a variable is invalid. */ | |
889 | && current_function_decl != 0 | |
890 | && ! pedantic | |
891 | && ! TREE_THIS_VOLATILE (decl) | |
892 | && DECL_INITIAL (decl) != 0 | |
893 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
894 | /* This is invalid if initial value is not constant. | |
895 | If it has either a function call, a memory reference, | |
896 | or a variable, then re-evaluating it could give different results. */ | |
897 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
898 | /* Check for cases where this is sub-optimal, even though valid. */ | |
899 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR | |
900 | && DECL_MODE (decl) != BLKmode) | |
901 | return DECL_INITIAL (decl); | |
902 | return decl; | |
903 | } | |
904 | ||
905 | /* Perform default promotions for C data used in expressions. | |
906 | Arrays and functions are converted to pointers; | |
907 | enumeral types or short or char, to int. | |
908 | In addition, manifest constants symbols are replaced by their values. */ | |
909 | ||
910 | tree | |
911 | default_conversion (exp) | |
912 | tree exp; | |
913 | { | |
914 | register tree type = TREE_TYPE (exp); | |
915 | register enum tree_code code = TREE_CODE (type); | |
916 | ||
917 | /* Constants can be used directly unless they're not loadable. */ | |
918 | if (TREE_CODE (exp) == CONST_DECL) | |
919 | exp = DECL_INITIAL (exp); | |
920 | /* Replace a nonvolatile const static variable with its value. */ | |
921 | else if (optimize | |
922 | && TREE_CODE (exp) == VAR_DECL | |
923 | && TREE_READONLY (exp) | |
ec193993 RS |
924 | /* But not for iterators! */ |
925 | && !ITERATOR_P (exp) | |
400fbf9f JW |
926 | && DECL_MODE (exp) != BLKmode) |
927 | { | |
928 | exp = decl_constant_value (exp); | |
929 | type = TREE_TYPE (exp); | |
930 | } | |
931 | ||
a7d53fce RS |
932 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as |
933 | an lvalue. */ | |
934 | /* Do not use STRIP_NOPS here! It will remove conversions from pointer | |
935 | to integer and cause infinite recursion. */ | |
936 | while (TREE_CODE (exp) == NON_LVALUE_EXPR | |
937 | || (TREE_CODE (exp) == NOP_EXPR | |
938 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
939 | exp = TREE_OPERAND (exp, 0); | |
400fbf9f JW |
940 | |
941 | /* Normally convert enums to int, | |
942 | but convert wide enums to something wider. */ | |
943 | if (code == ENUMERAL_TYPE) | |
944 | { | |
945 | type = type_for_size (MAX (TYPE_PRECISION (type), | |
946 | TYPE_PRECISION (integer_type_node)), | |
947 | (flag_traditional && TREE_UNSIGNED (type))); | |
948 | return convert (type, exp); | |
949 | } | |
950 | ||
d627ed1b | 951 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f | 952 | { |
e83d45c4 RS |
953 | /* Traditionally, unsignedness is preserved in default promotions. |
954 | Also preserve unsignedness if not really getting any wider. */ | |
955 | if (TREE_UNSIGNED (type) | |
956 | && (flag_traditional | |
957 | || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) | |
400fbf9f JW |
958 | return convert (unsigned_type_node, exp); |
959 | return convert (integer_type_node, exp); | |
960 | } | |
6cb72a7d | 961 | if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
962 | return convert (double_type_node, exp); |
963 | if (code == VOID_TYPE) | |
964 | { | |
965 | error ("void value not ignored as it ought to be"); | |
966 | return error_mark_node; | |
967 | } | |
968 | if (code == FUNCTION_TYPE) | |
969 | { | |
970 | return build_unary_op (ADDR_EXPR, exp, 0); | |
971 | } | |
972 | if (code == ARRAY_TYPE) | |
973 | { | |
974 | register tree adr; | |
975 | tree restype = TREE_TYPE (type); | |
976 | tree ptrtype; | |
d11fdb45 RS |
977 | int constp = 0; |
978 | int volatilep = 0; | |
979 | ||
980 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' | |
981 | || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
982 | { | |
983 | constp = TREE_READONLY (exp); | |
984 | volatilep = TREE_THIS_VOLATILE (exp); | |
985 | } | |
986 | ||
987 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type) | |
988 | || constp || volatilep) | |
989 | restype = c_build_type_variant (restype, | |
990 | TYPE_READONLY (type) || constp, | |
991 | TYPE_VOLATILE (type) || volatilep); | |
400fbf9f JW |
992 | |
993 | if (TREE_CODE (exp) == INDIRECT_REF) | |
994 | return convert (TYPE_POINTER_TO (restype), | |
995 | TREE_OPERAND (exp, 0)); | |
996 | ||
997 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
998 | { | |
999 | tree op1 = default_conversion (TREE_OPERAND (exp, 1)); | |
1000 | return build (COMPOUND_EXPR, TREE_TYPE (op1), | |
1001 | TREE_OPERAND (exp, 0), op1); | |
1002 | } | |
1003 | ||
1004 | if (!lvalue_p (exp) | |
1005 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) | |
1006 | { | |
8efabd13 RS |
1007 | error ("invalid use of non-lvalue array"); |
1008 | return error_mark_node; | |
400fbf9f JW |
1009 | } |
1010 | ||
400fbf9f JW |
1011 | ptrtype = build_pointer_type (restype); |
1012 | ||
1013 | if (TREE_CODE (exp) == VAR_DECL) | |
1014 | { | |
1015 | /* ??? This is not really quite correct | |
1016 | in that the type of the operand of ADDR_EXPR | |
1017 | is not the target type of the type of the ADDR_EXPR itself. | |
1018 | Question is, can this lossage be avoided? */ | |
1019 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1020 | if (mark_addressable (exp) == 0) | |
1021 | return error_mark_node; | |
1022 | TREE_CONSTANT (adr) = staticp (exp); | |
1023 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1024 | return adr; | |
1025 | } | |
1026 | /* This way is better for a COMPONENT_REF since it can | |
1027 | simplify the offset for a component. */ | |
1028 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1029 | return convert (ptrtype, adr); | |
1030 | } | |
1031 | return exp; | |
1032 | } | |
1033 | \f | |
1034 | /* Make an expression to refer to the COMPONENT field of | |
1035 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1036 | ||
1037 | tree | |
1038 | build_component_ref (datum, component) | |
1039 | tree datum, component; | |
1040 | { | |
1041 | register tree type = TREE_TYPE (datum); | |
1042 | register enum tree_code code = TREE_CODE (type); | |
1043 | register tree field = NULL; | |
1044 | register tree ref; | |
1045 | ||
1046 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it | |
1047 | unless we are not to support things not strictly ANSI. */ | |
1048 | switch (TREE_CODE (datum)) | |
1049 | { | |
1050 | case COMPOUND_EXPR: | |
1051 | { | |
1052 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component); | |
400fbf9f JW |
1053 | return build (COMPOUND_EXPR, TREE_TYPE (value), |
1054 | TREE_OPERAND (datum, 0), value); | |
1055 | } | |
1056 | case COND_EXPR: | |
400fbf9f JW |
1057 | return build_conditional_expr |
1058 | (TREE_OPERAND (datum, 0), | |
1059 | build_component_ref (TREE_OPERAND (datum, 1), component), | |
1060 | build_component_ref (TREE_OPERAND (datum, 2), component)); | |
1061 | } | |
1062 | ||
1063 | /* See if there is a field or component with name COMPONENT. */ | |
1064 | ||
1065 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1066 | { | |
1067 | if (TYPE_SIZE (type) == 0) | |
1068 | { | |
8d9bfdc5 | 1069 | incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1070 | return error_mark_node; |
1071 | } | |
1072 | ||
1073 | /* Look up component name in the structure type definition. | |
1074 | ||
1075 | If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1076 | to the field elements. Use a binary search on this array to quickly | |
1077 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1078 | will always be set for structures which have many elements. */ | |
1079 | ||
1080 | if (TYPE_LANG_SPECIFIC (type)) | |
1081 | { | |
1082 | int bot, top, half; | |
1083 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0]; | |
1084 | ||
1085 | field = TYPE_FIELDS (type); | |
1086 | bot = 0; | |
1087 | top = TYPE_LANG_SPECIFIC (type)->len; | |
1088 | while (top - bot > 1) | |
1089 | { | |
1090 | int cmp; | |
1091 | ||
1092 | half = (top - bot + 1) >> 1; | |
1093 | field = field_array[bot+half]; | |
1094 | cmp = (long)DECL_NAME (field) - (long)component; | |
1095 | if (cmp == 0) | |
1096 | break; | |
1097 | if (cmp < 0) | |
1098 | bot += half; | |
1099 | else | |
1100 | top = bot + half; | |
1101 | } | |
1102 | ||
1103 | if (DECL_NAME (field_array[bot]) == component) | |
1104 | field = field_array[bot]; | |
1105 | else if (DECL_NAME (field) != component) | |
1106 | field = 0; | |
1107 | } | |
1108 | else | |
1109 | { | |
1110 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1111 | { | |
1112 | if (DECL_NAME (field) == component) | |
1113 | break; | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | if (!field) | |
1118 | { | |
1119 | error (code == RECORD_TYPE | |
1120 | ? "structure has no member named `%s'" | |
1121 | : "union has no member named `%s'", | |
1122 | IDENTIFIER_POINTER (component)); | |
1123 | return error_mark_node; | |
1124 | } | |
1125 | if (TREE_TYPE (field) == error_mark_node) | |
1126 | return error_mark_node; | |
1127 | ||
1128 | ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); | |
1129 | ||
1130 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1131 | TREE_READONLY (ref) = 1; | |
1132 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1133 | TREE_THIS_VOLATILE (ref) = 1; | |
1134 | ||
1135 | return ref; | |
1136 | } | |
1137 | else if (code != ERROR_MARK) | |
1138 | error ("request for member `%s' in something not a structure or union", | |
1139 | IDENTIFIER_POINTER (component)); | |
1140 | ||
1141 | return error_mark_node; | |
1142 | } | |
1143 | \f | |
1144 | /* Given an expression PTR for a pointer, return an expression | |
1145 | for the value pointed to. | |
1146 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1147 | ||
1148 | tree | |
1149 | build_indirect_ref (ptr, errorstring) | |
1150 | tree ptr; | |
1151 | char *errorstring; | |
1152 | { | |
1153 | register tree pointer = default_conversion (ptr); | |
1154 | register tree type = TREE_TYPE (pointer); | |
1155 | ||
1156 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b RS |
1157 | { |
1158 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1159 | && !flag_volatile | |
1160 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) | |
1161 | == TREE_TYPE (type))) | |
1162 | return TREE_OPERAND (pointer, 0); | |
1163 | else | |
1164 | { | |
1165 | tree t = TREE_TYPE (type); | |
1166 | register tree ref = build1 (INDIRECT_REF, | |
1167 | TYPE_MAIN_VARIANT (t), pointer); | |
400fbf9f | 1168 | |
870cc33b RS |
1169 | if (TYPE_SIZE (t) == 0 && TREE_CODE (t) != ARRAY_TYPE) |
1170 | { | |
1171 | error ("dereferencing pointer to incomplete type"); | |
1172 | return error_mark_node; | |
1173 | } | |
1174 | if (TREE_CODE (t) == VOID_TYPE) | |
1175 | warning ("dereferencing `void *' pointer"); | |
1176 | ||
1177 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
1178 | so that we get the proper error message if the result is used | |
1179 | to assign to. Also, &* is supposed to be a no-op. | |
1180 | And ANSI C seems to specify that the type of the result | |
1181 | should be the const type. */ | |
1182 | /* A de-reference of a pointer to const is not a const. It is valid | |
1183 | to change it via some other pointer. */ | |
1184 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
1185 | TREE_SIDE_EFFECTS (ref) | |
1186 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile; | |
1187 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t) || flag_volatile; | |
1188 | return ref; | |
1189 | } | |
1190 | } | |
400fbf9f JW |
1191 | else if (TREE_CODE (pointer) != ERROR_MARK) |
1192 | error ("invalid type argument of `%s'", errorstring); | |
1193 | return error_mark_node; | |
1194 | } | |
1195 | ||
1196 | /* This handles expressions of the form "a[i]", which denotes | |
1197 | an array reference. | |
1198 | ||
1199 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
1200 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
1201 | This avoids forcing the array out of registers, and can work on | |
1202 | arrays that are not lvalues (for example, members of structures returned | |
1203 | by functions). */ | |
1204 | ||
1205 | tree | |
1206 | build_array_ref (array, index) | |
1207 | tree array, index; | |
1208 | { | |
1209 | if (index == 0) | |
1210 | { | |
1211 | error ("subscript missing in array reference"); | |
1212 | return error_mark_node; | |
1213 | } | |
1214 | ||
1215 | if (TREE_TYPE (array) == error_mark_node | |
1216 | || TREE_TYPE (index) == error_mark_node) | |
1217 | return error_mark_node; | |
1218 | ||
1219 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE | |
1220 | && TREE_CODE (array) != INDIRECT_REF) | |
1221 | { | |
1222 | tree rval, type; | |
1223 | ||
400fbf9f JW |
1224 | /* Subscripting with type char is likely to lose |
1225 | on a machine where chars are signed. | |
1226 | So warn on any machine, but optionally. | |
1227 | Don't warn for unsigned char since that type is safe. | |
1228 | Don't warn for signed char because anyone who uses that | |
1229 | must have done so deliberately. */ | |
1230 | if (warn_char_subscripts | |
1231 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1232 | warning ("array subscript has type `char'"); | |
1233 | ||
0e51ef9b RS |
1234 | /* Apply default promotions *after* noticing character types. */ |
1235 | index = default_conversion (index); | |
1236 | ||
fdeefd49 RS |
1237 | /* Require integer *after* promotion, for sake of enums. */ |
1238 | if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE) | |
1239 | { | |
1240 | error ("array subscript is not an integer"); | |
1241 | return error_mark_node; | |
1242 | } | |
1243 | ||
400fbf9f JW |
1244 | /* An array that is indexed by a non-constant |
1245 | cannot be stored in a register; we must be able to do | |
1246 | address arithmetic on its address. | |
1247 | Likewise an array of elements of variable size. */ | |
1248 | if (TREE_CODE (index) != INTEGER_CST | |
1249 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
1250 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
1251 | { | |
1252 | if (mark_addressable (array) == 0) | |
1253 | return error_mark_node; | |
1254 | } | |
1255 | ||
1256 | if (pedantic && !lvalue_p (array)) | |
1257 | { | |
1394aabd | 1258 | if (DECL_REGISTER (array)) |
400fbf9f JW |
1259 | pedwarn ("ANSI C forbids subscripting `register' array"); |
1260 | else | |
1261 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); | |
1262 | } | |
1263 | ||
1264 | if (pedantic) | |
1265 | { | |
1266 | tree foo = array; | |
1267 | while (TREE_CODE (foo) == COMPONENT_REF) | |
1268 | foo = TREE_OPERAND (foo, 0); | |
1394aabd | 1269 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) |
400fbf9f JW |
1270 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); |
1271 | } | |
1272 | ||
1273 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
1274 | rval = build (ARRAY_REF, type, array, index); | |
1275 | /* Array ref is const/volatile if the array elements are | |
1276 | or if the array is. */ | |
1277 | TREE_READONLY (rval) | |
1278 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
1279 | | TREE_READONLY (array)); | |
1280 | TREE_SIDE_EFFECTS (rval) | |
1281 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1282 | | TREE_SIDE_EFFECTS (array)); | |
1283 | TREE_THIS_VOLATILE (rval) | |
1284 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1285 | /* This was added by rms on 16 Nov 91. | |
1286 | It fixes vol struct foo *a; a->elts[1] | |
1287 | in an inline function. | |
1288 | Hope it doesn't break something else. */ | |
1289 | | TREE_THIS_VOLATILE (array)); | |
1290 | return require_complete_type (fold (rval)); | |
1291 | } | |
1292 | ||
1293 | { | |
1294 | tree ar = default_conversion (array); | |
1295 | tree ind = default_conversion (index); | |
1296 | ||
1297 | /* Put the integer in IND to simplify error checking. */ | |
1298 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
1299 | { | |
1300 | tree temp = ar; | |
1301 | ar = ind; | |
1302 | ind = temp; | |
1303 | } | |
1304 | ||
1305 | if (ar == error_mark_node) | |
1306 | return ar; | |
1307 | ||
1308 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) | |
1309 | { | |
1310 | error ("subscripted value is neither array nor pointer"); | |
1311 | return error_mark_node; | |
1312 | } | |
1313 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
1314 | { | |
1315 | error ("array subscript is not an integer"); | |
1316 | return error_mark_node; | |
1317 | } | |
1318 | ||
1319 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0), | |
1320 | "array indexing"); | |
1321 | } | |
1322 | } | |
1323 | \f | |
1324 | /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against PARAMS. */ | |
1325 | ||
1326 | #define ISDIGIT(c) ((c) >= '0' && (c) <= '9') | |
1327 | ||
1328 | #define T_I &integer_type_node | |
1329 | #define T_L &long_integer_type_node | |
1330 | #define T_S &short_integer_type_node | |
1331 | #define T_UI &unsigned_type_node | |
1332 | #define T_UL &long_unsigned_type_node | |
1333 | #define T_US &short_unsigned_type_node | |
1334 | #define T_F &float_type_node | |
1335 | #define T_D &double_type_node | |
1336 | #define T_LD &long_double_type_node | |
1337 | #define T_C &char_type_node | |
1338 | #define T_V &void_type_node | |
d3c738e1 | 1339 | #define T_W &wchar_type_node |
400fbf9f JW |
1340 | |
1341 | typedef struct | |
1342 | { | |
1343 | char *format_chars; | |
1344 | int pointer_count; | |
1345 | /* Type of argument if no length modifier is used. */ | |
1346 | tree *nolen; | |
1347 | /* Type of argument if length modifier for shortening is used. | |
1348 | If NULL, then this modifier is not allowed. */ | |
1349 | tree *hlen; | |
1350 | /* Type of argument if length modifier `l' is used. | |
1351 | If NULL, then this modifier is not allowed. */ | |
1352 | tree *llen; | |
1353 | /* Type of argument if length modifier `L' is used. | |
1354 | If NULL, then this modifier is not allowed. */ | |
1355 | tree *bigllen; | |
1356 | /* List of other modifier characters allowed with these options. */ | |
1357 | char *flag_chars; | |
1358 | } format_char_info; | |
1359 | ||
1360 | static format_char_info print_table[] | |
1361 | = { | |
1362 | { "di", 0, T_I, T_I, T_L, NULL, "-wp0 +" }, | |
1363 | { "oxX", 0, T_UI, T_UI, T_UL, NULL, "-wp0#" }, | |
1364 | { "u", 0, T_UI, T_UI, T_UL, NULL, "-wp0" }, | |
1365 | { "feEgG", 0, T_D, NULL, NULL, T_LD, "-wp0 +#" }, | |
d3c738e1 RS |
1366 | { "c", 0, T_I, NULL, T_W, NULL, "-w" }, |
1367 | { "C", 0, T_W, NULL, NULL, NULL, "-w" }, | |
1368 | { "s", 1, T_C, NULL, T_W, NULL, "-wp" }, | |
1369 | { "S", 1, T_W, NULL, NULL, NULL, "-wp" }, | |
400fbf9f JW |
1370 | { "p", 1, T_V, NULL, NULL, NULL, "-" }, |
1371 | { "n", 1, T_I, T_S, T_L, NULL, "" }, | |
1372 | { NULL } | |
1373 | }; | |
1374 | ||
1375 | static format_char_info scan_table[] | |
1376 | = { | |
1377 | { "di", 1, T_I, T_S, T_L, NULL, "*" }, | |
1378 | { "ouxX", 1, T_UI, T_US, T_UL, NULL, "*" }, | |
1379 | { "efgEG", 1, T_F, NULL, T_D, T_LD, "*" }, | |
d3c738e1 RS |
1380 | { "sc", 1, T_C, NULL, T_W, NULL, "*" }, |
1381 | { "[", 1, T_C, NULL, NULL, NULL, "*" }, | |
1382 | { "C", 1, T_W, NULL, NULL, NULL, "*" }, | |
1383 | { "S", 1, T_W, NULL, NULL, NULL, "*" }, | |
400fbf9f JW |
1384 | { "p", 2, T_V, NULL, NULL, NULL, "*" }, |
1385 | { "n", 1, T_I, T_S, T_L, NULL, "" }, | |
1386 | { NULL } | |
1387 | }; | |
1388 | ||
1389 | typedef struct | |
1390 | { | |
1391 | tree function_ident; /* identifier such as "printf" */ | |
1392 | int is_scan; /* TRUE if *scanf */ | |
1393 | int format_num; /* number of format argument */ | |
1394 | int first_arg_num; /* number of first arg (zero for varargs) */ | |
1395 | } function_info; | |
1396 | ||
1397 | static unsigned int function_info_entries = 0; | |
1398 | static function_info *function_info_table = NULL; | |
1399 | ||
1400 | /* Record information for argument format checking. FUNCTION_IDENT is | |
1401 | the identifier node for the name of the function to check (its decl | |
1402 | need not exist yet). IS_SCAN is true for scanf-type format checking; | |
1403 | false indicates printf-style format checking. FORMAT_NUM is the number | |
1404 | of the argument which is the format control string (starting from 1). | |
1405 | FIRST_ARG_NUM is the number of the first actual argument to check | |
1406 | against teh format string, or zero if no checking is not be done | |
1407 | (e.g. for varargs such as vfprintf). */ | |
1408 | ||
1409 | void | |
1410 | record_format_info (function_ident, is_scan, format_num, first_arg_num) | |
1411 | tree function_ident; | |
1412 | int is_scan; | |
1413 | int format_num; | |
1414 | int first_arg_num; | |
1415 | { | |
1416 | function_info *info; | |
1417 | ||
1418 | function_info_entries++; | |
1419 | if (function_info_table) | |
1420 | function_info_table | |
1421 | = (function_info *) xrealloc (function_info_table, | |
1422 | function_info_entries * sizeof (function_info)); | |
1423 | else | |
1424 | function_info_table = (function_info *) xmalloc (sizeof (function_info)); | |
1425 | ||
1426 | info = &function_info_table[function_info_entries - 1]; | |
1427 | ||
1428 | info->function_ident = function_ident; | |
1429 | info->is_scan = is_scan; | |
1430 | info->format_num = format_num; | |
1431 | info->first_arg_num = first_arg_num; | |
1432 | } | |
1433 | ||
1434 | /* Initialize the table of functions to perform format checking on. | |
1435 | The ANSI functions are always checked (whether <stdio.h> is | |
1436 | included or not), since it is common to call printf without | |
1437 | including <stdio.h>. There shouldn't be a problem with this, | |
1438 | since ANSI reserves these function names whether you include the | |
1439 | header file or not. In any case, the checking is harmless. */ | |
1440 | ||
1441 | void | |
1442 | init_format_info_table () | |
1443 | { | |
1444 | record_format_info (get_identifier ("printf"), 0, 1, 2); | |
1445 | record_format_info (get_identifier ("fprintf"), 0, 2, 3); | |
1446 | record_format_info (get_identifier ("sprintf"), 0, 2, 3); | |
1447 | record_format_info (get_identifier ("scanf"), 1, 1, 2); | |
1448 | record_format_info (get_identifier ("fscanf"), 1, 2, 3); | |
1449 | record_format_info (get_identifier ("sscanf"), 1, 2, 3); | |
1450 | record_format_info (get_identifier ("vprintf"), 0, 1, 0); | |
1451 | record_format_info (get_identifier ("vfprintf"), 0, 2, 0); | |
1452 | record_format_info (get_identifier ("vsprintf"), 0, 2, 0); | |
1453 | } | |
1454 | ||
1455 | static char tfaff[] = "too few arguments for format"; | |
400fbf9f JW |
1456 | \f |
1457 | /* Check the argument list of a call to printf, scanf, etc. | |
1458 | INFO points to the element of function_info_table. | |
1459 | PARAMS is the list of argument values. */ | |
1460 | ||
1461 | static void | |
1462 | check_format (info, params) | |
1463 | function_info *info; | |
1464 | tree params; | |
1465 | { | |
1466 | int i; | |
1467 | int arg_num; | |
1468 | int suppressed, wide, precise; | |
1469 | int length_char; | |
1470 | int format_char; | |
1471 | int format_length; | |
1472 | tree format_tree; | |
1473 | tree cur_param; | |
1474 | tree cur_type; | |
1475 | tree wanted_type; | |
1476 | char *format_chars; | |
1477 | format_char_info *fci; | |
1478 | static char message[132]; | |
1479 | char flag_chars[8]; | |
1480 | ||
1481 | /* Skip to format argument. If the argument isn't available, there's | |
1482 | no work for us to do; prototype checking will catch the problem. */ | |
1483 | for (arg_num = 1; ; ++arg_num) | |
1484 | { | |
1485 | if (params == 0) | |
1486 | return; | |
1487 | if (arg_num == info->format_num) | |
1488 | break; | |
1489 | params = TREE_CHAIN (params); | |
1490 | } | |
1491 | format_tree = TREE_VALUE (params); | |
1492 | params = TREE_CHAIN (params); | |
1493 | if (format_tree == 0) | |
1494 | return; | |
1495 | /* We can only check the format if it's a string constant. */ | |
1496 | while (TREE_CODE (format_tree) == NOP_EXPR) | |
1497 | format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */ | |
1498 | if (format_tree == null_pointer_node) | |
1499 | { | |
1500 | warning ("null format string"); | |
1501 | return; | |
1502 | } | |
1503 | if (TREE_CODE (format_tree) != ADDR_EXPR) | |
1504 | return; | |
1505 | format_tree = TREE_OPERAND (format_tree, 0); | |
1506 | if (TREE_CODE (format_tree) != STRING_CST) | |
1507 | return; | |
1508 | format_chars = TREE_STRING_POINTER (format_tree); | |
1509 | format_length = TREE_STRING_LENGTH (format_tree); | |
1510 | if (format_length <= 1) | |
1511 | warning ("zero-length format string"); | |
1512 | if (format_chars[--format_length] != 0) | |
1513 | { | |
1514 | warning ("unterminated format string"); | |
1515 | return; | |
1516 | } | |
1517 | /* Skip to first argument to check. */ | |
1518 | while (arg_num + 1 < info->first_arg_num) | |
1519 | { | |
1520 | if (params == 0) | |
1521 | return; | |
1522 | params = TREE_CHAIN (params); | |
1523 | ++arg_num; | |
1524 | } | |
1525 | while (1) | |
1526 | { | |
1527 | if (*format_chars == 0) | |
1528 | { | |
1529 | if (format_chars - TREE_STRING_POINTER (format_tree) != format_length) | |
1530 | warning ("embedded `\\0' in format"); | |
1531 | if (info->first_arg_num != 0 && params != 0) | |
1532 | warning ("too many arguments for format"); | |
1533 | return; | |
1534 | } | |
1535 | if (*format_chars++ != '%') | |
1536 | continue; | |
1537 | if (*format_chars == 0) | |
1538 | { | |
1539 | warning ("spurious trailing `%%' in format"); | |
1540 | continue; | |
1541 | } | |
1542 | if (*format_chars == '%') | |
1543 | { | |
1544 | ++format_chars; | |
1545 | continue; | |
1546 | } | |
1547 | flag_chars[0] = 0; | |
1548 | suppressed = wide = precise = FALSE; | |
1549 | if (info->is_scan) | |
1550 | { | |
1551 | suppressed = *format_chars == '*'; | |
1552 | if (suppressed) | |
1553 | ++format_chars; | |
1554 | while (ISDIGIT (*format_chars)) | |
1555 | ++format_chars; | |
1556 | } | |
1557 | else | |
1558 | { | |
3845b542 | 1559 | while (*format_chars != 0 && index (" +#0-", *format_chars) != 0) |
400fbf9f | 1560 | { |
3845b542 | 1561 | if (index (flag_chars, *format_chars) != 0) |
400fbf9f JW |
1562 | { |
1563 | sprintf (message, "repeated `%c' flag in format", | |
1564 | *format_chars); | |
1565 | warning (message); | |
1566 | } | |
1567 | i = strlen (flag_chars); | |
1568 | flag_chars[i++] = *format_chars++; | |
1569 | flag_chars[i] = 0; | |
1570 | } | |
1571 | /* "If the space and + flags both appear, | |
1572 | the space flag will be ignored." */ | |
3845b542 MS |
1573 | if (index (flag_chars, ' ') != 0 |
1574 | && index (flag_chars, '+') != 0) | |
400fbf9f JW |
1575 | warning ("use of both ` ' and `+' flags in format"); |
1576 | /* "If the 0 and - flags both appear, | |
1577 | the 0 flag will be ignored." */ | |
3845b542 MS |
1578 | if (index (flag_chars, '0') != 0 |
1579 | && index (flag_chars, '-') != 0) | |
400fbf9f JW |
1580 | warning ("use of both `0' and `-' flags in format"); |
1581 | if (*format_chars == '*') | |
1582 | { | |
1583 | wide = TRUE; | |
1584 | /* "...a field width...may be indicated by an asterisk. | |
1585 | In this case, an int argument supplies the field width..." */ | |
1586 | ++format_chars; | |
1587 | if (params == 0) | |
1588 | { | |
1589 | warning (tfaff); | |
1590 | return; | |
1591 | } | |
1592 | if (info->first_arg_num != 0) | |
1593 | { | |
1594 | cur_param = TREE_VALUE (params); | |
1595 | params = TREE_CHAIN (params); | |
1596 | ++arg_num; | |
0597a777 RS |
1597 | /* size_t is generally not valid here. |
1598 | It will work on most machines, because size_t and int | |
1599 | have the same mode. But might as well warn anyway, | |
1600 | since it will fail on other machines. */ | |
6cb72a7d RS |
1601 | if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param)) |
1602 | != integer_type_node) | |
400fbf9f JW |
1603 | { |
1604 | sprintf (message, | |
1605 | "field width is not type int (arg %d)", | |
1606 | arg_num); | |
1607 | warning (message); | |
1608 | } | |
1609 | } | |
1610 | } | |
1611 | else | |
1612 | { | |
1613 | while (ISDIGIT (*format_chars)) | |
1614 | { | |
1615 | wide = TRUE; | |
1616 | ++format_chars; | |
1617 | } | |
1618 | } | |
1619 | if (*format_chars == '.') | |
1620 | { | |
1621 | precise = TRUE; | |
400fbf9f JW |
1622 | ++format_chars; |
1623 | if (*format_chars != '*' && !ISDIGIT (*format_chars)) | |
1624 | warning ("`.' not followed by `*' or digit in format"); | |
1625 | /* "...a...precision...may be indicated by an asterisk. | |
1626 | In this case, an int argument supplies the...precision." */ | |
1627 | if (*format_chars == '*') | |
1628 | { | |
1629 | if (info->first_arg_num != 0) | |
1630 | { | |
1631 | ++format_chars; | |
1632 | if (params == 0) | |
1633 | { | |
1634 | warning (tfaff); | |
1635 | return; | |
1636 | } | |
1637 | cur_param = TREE_VALUE (params); | |
1638 | params = TREE_CHAIN (params); | |
1639 | ++arg_num; | |
6cb72a7d RS |
1640 | if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param)) |
1641 | != integer_type_node) | |
400fbf9f JW |
1642 | { |
1643 | sprintf (message, | |
1644 | "field width is not type int (arg %d)", | |
1645 | arg_num); | |
1646 | warning (message); | |
1647 | } | |
1648 | } | |
1649 | } | |
1650 | else | |
1651 | { | |
1652 | while (ISDIGIT (*format_chars)) | |
1653 | ++format_chars; | |
1654 | } | |
1655 | } | |
1656 | } | |
1657 | if (*format_chars == 'h' || *format_chars == 'l' || *format_chars == 'L') | |
1658 | length_char = *format_chars++; | |
1659 | else | |
1660 | length_char = 0; | |
1661 | if (suppressed && length_char != 0) | |
1662 | { | |
1663 | sprintf (message, | |
1664 | "use of `*' and `%c' together in format", | |
1665 | length_char); | |
1666 | warning (message); | |
1667 | } | |
1668 | format_char = *format_chars; | |
1669 | if (format_char == 0) | |
1670 | { | |
1671 | warning ("conversion lacks type at end of format"); | |
1672 | continue; | |
1673 | } | |
1674 | format_chars++; | |
1675 | fci = info->is_scan ? scan_table : print_table; | |
1676 | while (1) | |
1677 | { | |
1678 | if (fci->format_chars == 0 | |
3845b542 | 1679 | || index (fci->format_chars, format_char) != 0) |
400fbf9f JW |
1680 | break; |
1681 | ++fci; | |
1682 | } | |
1683 | if (fci->format_chars == 0) | |
1684 | { | |
e64bddee | 1685 | if (format_char >= 040 && format_char < 0177) |
400fbf9f JW |
1686 | sprintf (message, |
1687 | "unknown conversion type character `%c' in format", | |
1688 | format_char); | |
1689 | else | |
1690 | sprintf (message, | |
1691 | "unknown conversion type character 0x%x in format", | |
1692 | format_char); | |
1693 | warning (message); | |
1694 | continue; | |
1695 | } | |
3845b542 | 1696 | if (wide && index (fci->flag_chars, 'w') == 0) |
400fbf9f JW |
1697 | { |
1698 | sprintf (message, "width used with `%c' format", | |
1699 | format_char); | |
1700 | warning (message); | |
1701 | } | |
3845b542 | 1702 | if (precise && index (fci->flag_chars, 'p') == 0) |
400fbf9f JW |
1703 | { |
1704 | sprintf (message, "precision used with `%c' format", | |
1705 | format_char); | |
1706 | warning (message); | |
1707 | } | |
1708 | if (suppressed) | |
1709 | { | |
3845b542 | 1710 | if (index (fci->flag_chars, '*') == 0) |
400fbf9f JW |
1711 | { |
1712 | sprintf (message, | |
1713 | "suppression of `%c' conversion in format", | |
1714 | format_char); | |
1715 | warning (message); | |
1716 | } | |
1717 | continue; | |
1718 | } | |
1719 | for (i = 0; flag_chars[i] != 0; ++i) | |
1720 | { | |
3845b542 | 1721 | if (index (fci->flag_chars, flag_chars[i]) == 0) |
400fbf9f JW |
1722 | { |
1723 | sprintf (message, "flag `%c' used with type `%c'", | |
1724 | flag_chars[i], format_char); | |
1725 | warning (message); | |
1726 | } | |
1727 | } | |
8d162cab RK |
1728 | if (precise && index (flag_chars, '0') != 0 |
1729 | && (format_char == 'd' || format_char == 'i' | |
1730 | || format_char == 'o' || format_char == 'u' | |
1731 | || format_char == 'x' || format_char == 'x')) | |
1732 | { | |
1733 | sprintf (message, | |
1734 | "precision and `0' flag not both allowed with `%c' format", | |
1735 | format_char); | |
1736 | warning (message); | |
1737 | } | |
400fbf9f JW |
1738 | switch (length_char) |
1739 | { | |
1740 | default: wanted_type = fci->nolen ? *(fci->nolen) : 0; break; | |
1741 | case 'h': wanted_type = fci->hlen ? *(fci->hlen) : 0; break; | |
1742 | case 'l': wanted_type = fci->llen ? *(fci->llen) : 0; break; | |
1743 | case 'L': wanted_type = fci->bigllen ? *(fci->bigllen) : 0; break; | |
1744 | } | |
1745 | if (wanted_type == 0) | |
1746 | { | |
1747 | sprintf (message, | |
1748 | "use of `%c' length character with `%c' type character", | |
1749 | length_char, format_char); | |
1750 | warning (message); | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | ** XXX -- should kvetch about stuff such as | |
1755 | ** { | |
1756 | ** const int i; | |
1757 | ** | |
1758 | ** scanf ("%d", &i); | |
1759 | ** } | |
1760 | */ | |
1761 | ||
1762 | /* Finally. . .check type of argument against desired type! */ | |
1763 | if (info->first_arg_num == 0) | |
1764 | continue; | |
1765 | if (params == 0) | |
1766 | { | |
1767 | warning (tfaff); | |
1768 | return; | |
1769 | } | |
1770 | cur_param = TREE_VALUE (params); | |
1771 | params = TREE_CHAIN (params); | |
1772 | ++arg_num; | |
1773 | cur_type = TREE_TYPE (cur_param); | |
1774 | ||
1775 | /* Check the types of any additional pointer arguments | |
1776 | that precede the "real" argument. */ | |
1777 | for (i = 0; i < fci->pointer_count; ++i) | |
1778 | { | |
1779 | if (TREE_CODE (cur_type) == POINTER_TYPE) | |
1780 | { | |
1781 | cur_type = TREE_TYPE (cur_type); | |
1782 | continue; | |
1783 | } | |
1784 | sprintf (message, | |
1785 | "format argument is not a %s (arg %d)", | |
1786 | ((fci->pointer_count == 1) ? "pointer" : "pointer to a pointer"), | |
1787 | arg_num); | |
1788 | warning (message); | |
1789 | break; | |
1790 | } | |
1791 | ||
1792 | /* Check the type of the "real" argument, if there's a type we want. */ | |
1793 | if (i == fci->pointer_count && wanted_type != 0 | |
6cb72a7d | 1794 | && wanted_type != TYPE_MAIN_VARIANT (cur_type) |
047de90b RS |
1795 | /* If we want `void *', allow any pointer type. |
1796 | (Anything else would already have got a warning.) */ | |
1797 | && ! (wanted_type == void_type_node | |
1798 | && fci->pointer_count > 0) | |
400fbf9f JW |
1799 | /* Don't warn about differences merely in signedness. */ |
1800 | && !(TREE_CODE (wanted_type) == INTEGER_TYPE | |
1801 | && TREE_CODE (cur_type) == INTEGER_TYPE | |
36618528 RS |
1802 | && (wanted_type == (TREE_UNSIGNED (wanted_type) |
1803 | ? unsigned_type : signed_type) (cur_type)))) | |
400fbf9f JW |
1804 | { |
1805 | register char *this; | |
1806 | register char *that; | |
1807 | ||
1808 | this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type))); | |
1809 | that = 0; | |
d6272e45 RS |
1810 | if (TREE_CODE (cur_type) != ERROR_MARK |
1811 | && TYPE_NAME (cur_type) != 0 | |
047de90b RS |
1812 | && TREE_CODE (cur_type) != INTEGER_TYPE |
1813 | && !(TREE_CODE (cur_type) == POINTER_TYPE | |
d6272e45 RS |
1814 | && TREE_CODE (TREE_TYPE (cur_type)) == INTEGER_TYPE)) |
1815 | { | |
1816 | if (TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL | |
1817 | && DECL_NAME (TYPE_NAME (cur_type)) != 0) | |
1818 | that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type))); | |
1819 | else | |
1820 | that = IDENTIFIER_POINTER (TYPE_NAME (cur_type)); | |
1821 | } | |
400fbf9f JW |
1822 | |
1823 | /* A nameless type can't possibly match what the format wants. | |
1824 | So there will be a warning for it. | |
1825 | Make up a string to describe vaguely what it is. */ | |
1826 | if (that == 0) | |
1827 | { | |
1828 | if (TREE_CODE (cur_type) == POINTER_TYPE) | |
1829 | that = "pointer"; | |
1830 | else | |
1831 | that = "different type"; | |
1832 | } | |
1833 | ||
1834 | if (strcmp (this, that) != 0) | |
1835 | { | |
1836 | sprintf (message, "%s format, %s arg (arg %d)", | |
1837 | this, that, arg_num); | |
1838 | warning (message); | |
1839 | } | |
1840 | } | |
1841 | } | |
1842 | } | |
1843 | \f | |
1844 | /* Build a function call to function FUNCTION with parameters PARAMS. | |
1845 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
1846 | TREE_VALUE of each node is a parameter-expression. | |
1847 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
1848 | ||
1849 | tree | |
1850 | build_function_call (function, params) | |
1851 | tree function, params; | |
1852 | { | |
9b7267b8 | 1853 | register tree fntype, fundecl; |
400fbf9f JW |
1854 | register tree coerced_params; |
1855 | tree name = NULL_TREE; | |
1856 | ||
fc76e425 | 1857 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 1858 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
1859 | |
1860 | /* Convert anything with function type to a pointer-to-function. */ | |
1861 | if (TREE_CODE (function) == FUNCTION_DECL) | |
1862 | { | |
1863 | name = DECL_NAME (function); | |
1864 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE | |
1865 | (because calling an inline function does not mean the function | |
1866 | needs to be separately compiled). */ | |
1867 | fntype = build_type_variant (TREE_TYPE (function), | |
1868 | TREE_READONLY (function), | |
1869 | TREE_THIS_VOLATILE (function)); | |
9b7267b8 | 1870 | fundecl = function; |
400fbf9f JW |
1871 | function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); |
1872 | } | |
1873 | else | |
1874 | function = default_conversion (function); | |
1875 | ||
1876 | fntype = TREE_TYPE (function); | |
1877 | ||
1878 | if (TREE_CODE (fntype) == ERROR_MARK) | |
1879 | return error_mark_node; | |
1880 | ||
1881 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
1882 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
1883 | { | |
1884 | error ("called object is not a function"); | |
1885 | return error_mark_node; | |
1886 | } | |
1887 | ||
1888 | /* fntype now gets the type of function pointed to. */ | |
1889 | fntype = TREE_TYPE (fntype); | |
1890 | ||
1891 | /* Convert the parameters to the types declared in the | |
1892 | function prototype, or apply default promotions. */ | |
1893 | ||
1894 | coerced_params | |
9b7267b8 | 1895 | = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl); |
400fbf9f JW |
1896 | |
1897 | /* Check for errors in format strings. */ | |
1898 | if (warn_format && name != 0) | |
1899 | { | |
1900 | unsigned int i; | |
1901 | ||
1902 | /* See if this function is a format function. */ | |
1903 | for (i = 0; i < function_info_entries; i++) | |
1904 | if (function_info_table[i].function_ident == name) | |
1905 | { | |
1906 | register char *message; | |
1907 | ||
1908 | /* If so, check it. */ | |
1909 | check_format (&function_info_table[i], coerced_params); | |
1910 | break; | |
1911 | } | |
1912 | } | |
1913 | ||
1914 | /* Recognize certain built-in functions so we can make tree-codes | |
1915 | other than CALL_EXPR. We do this when it enables fold-const.c | |
1916 | to do something useful. */ | |
1917 | ||
1918 | if (TREE_CODE (function) == ADDR_EXPR | |
1919 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
1920 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
1921 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
1922 | { | |
1923 | case BUILT_IN_ABS: | |
1924 | case BUILT_IN_LABS: | |
1925 | case BUILT_IN_FABS: | |
1926 | if (coerced_params == 0) | |
1927 | return integer_zero_node; | |
1928 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
1929 | } | |
1930 | ||
1931 | { | |
1932 | register tree result | |
1933 | = build (CALL_EXPR, TREE_TYPE (fntype), | |
1934 | function, coerced_params, NULL_TREE); | |
1935 | ||
1936 | TREE_SIDE_EFFECTS (result) = 1; | |
1937 | if (TREE_TYPE (result) == void_type_node) | |
1938 | return result; | |
1939 | return require_complete_type (result); | |
1940 | } | |
1941 | } | |
1942 | \f | |
1943 | /* Convert the argument expressions in the list VALUES | |
1944 | to the types in the list TYPELIST. The result is a list of converted | |
1945 | argument expressions. | |
1946 | ||
1947 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
1948 | perform the default conversions. | |
1949 | ||
1950 | PARMLIST is the chain of parm decls for the function being called. | |
1951 | It may be 0, if that info is not available. | |
1952 | It is used only for generating error messages. | |
1953 | ||
1954 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
1955 | ||
1956 | This is also where warnings about wrong number of args are generated. | |
1957 | ||
1958 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
1959 | with the elements of the list in the TREE_VALUE slots of those nodes. */ | |
1960 | ||
1961 | static tree | |
9b7267b8 RS |
1962 | convert_arguments (typelist, values, name, fundecl) |
1963 | tree typelist, values, name, fundecl; | |
400fbf9f JW |
1964 | { |
1965 | register tree typetail, valtail; | |
1966 | register tree result = NULL; | |
1967 | int parmnum; | |
1968 | ||
1969 | /* Scan the given expressions and types, producing individual | |
1970 | converted arguments and pushing them on RESULT in reverse order. */ | |
1971 | ||
1972 | for (valtail = values, typetail = typelist, parmnum = 0; | |
1973 | valtail; | |
1974 | valtail = TREE_CHAIN (valtail), parmnum++) | |
1975 | { | |
1976 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
1977 | register tree val = TREE_VALUE (valtail); | |
1978 | ||
1979 | if (type == void_type_node) | |
1980 | { | |
1981 | if (name) | |
1982 | error ("too many arguments to function `%s'", | |
1983 | IDENTIFIER_POINTER (name)); | |
1984 | else | |
1985 | error ("too many arguments to function"); | |
1986 | break; | |
1987 | } | |
1988 | ||
1989 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
1990 | /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0 |
1991 | to convert automatically to a pointer. */ | |
400fbf9f JW |
1992 | if (TREE_CODE (val) == NON_LVALUE_EXPR) |
1993 | val = TREE_OPERAND (val, 0); | |
1994 | ||
1995 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
1996 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE) | |
1997 | val = default_conversion (val); | |
1998 | ||
1999 | val = require_complete_type (val); | |
2000 | ||
2001 | if (type != 0) | |
2002 | { | |
2003 | /* Formal parm type is specified by a function prototype. */ | |
2004 | tree parmval; | |
2005 | ||
2006 | if (TYPE_SIZE (type) == 0) | |
2007 | { | |
2008 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
2009 | parmval = val; | |
2010 | } | |
2011 | else | |
2012 | { | |
2013 | tree parmname; | |
36618528 | 2014 | tree type0 = type; |
400fbf9f JW |
2015 | #ifdef PROMOTE_PROTOTYPES |
2016 | /* Rather than truncating and then reextending, | |
2017 | convert directly to int, if that's the type we will want. */ | |
2018 | if (! flag_traditional | |
2019 | && TREE_CODE (type) == INTEGER_TYPE | |
2020 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2021 | type = integer_type_node; | |
2022 | #endif | |
2023 | ||
2024 | #if 0 /* This turns out not to win--there's no way to write a prototype | |
2025 | for a function whose arg type is a union with no tag. */ | |
2026 | /* Nameless union automatically casts the types it contains. */ | |
2027 | if (TREE_CODE (type) == UNION_TYPE && TYPE_NAME (type) == 0) | |
2028 | { | |
2029 | tree field; | |
2030 | ||
2031 | for (field = TYPE_FIELDS (type); field; | |
2032 | field = TREE_CHAIN (field)) | |
2033 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
2034 | TYPE_MAIN_VARIANT (TREE_TYPE (val)))) | |
2035 | break; | |
2036 | ||
2037 | if (field) | |
2038 | val = build1 (CONVERT_EXPR, type, val); | |
2039 | } | |
2040 | #endif | |
2041 | ||
d45cf215 RS |
2042 | /* Optionally warn about conversions that |
2043 | differ from the default conversions. */ | |
400fbf9f JW |
2044 | if (warn_conversion) |
2045 | { | |
2046 | int formal_prec = TYPE_PRECISION (type); | |
400fbf9f JW |
2047 | |
2048 | if (TREE_CODE (type) != REAL_TYPE | |
2049 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
754a4d82 | 2050 | warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f JW |
2051 | else if (TREE_CODE (type) == REAL_TYPE |
2052 | && TREE_CODE (TREE_TYPE (val)) != REAL_TYPE) | |
754a4d82 | 2053 | warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 RS |
2054 | else if (TREE_CODE (type) == REAL_TYPE |
2055 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
2056 | { | |
2057 | /* Warn if any argument is passed as `float', | |
047de90b | 2058 | since without a prototype it would be `double'. */ |
d45cf215 | 2059 | if (formal_prec == TYPE_PRECISION (float_type_node)) |
754a4d82 | 2060 | warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 | 2061 | } |
400fbf9f JW |
2062 | /* Detect integer changing in width or signedness. */ |
2063 | else if ((TREE_CODE (type) == INTEGER_TYPE | |
2064 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2065 | && (TREE_CODE (TREE_TYPE (val)) == INTEGER_TYPE | |
d45cf215 | 2066 | || TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE)) |
400fbf9f | 2067 | { |
d45cf215 RS |
2068 | tree would_have_been = default_conversion (val); |
2069 | tree type1 = TREE_TYPE (would_have_been); | |
2070 | ||
754a4d82 RS |
2071 | if (TREE_CODE (type) == ENUMERAL_TYPE |
2072 | && type == TREE_TYPE (val)) | |
2073 | /* No warning if function asks for enum | |
2074 | and the actual arg is that enum type. */ | |
2075 | ; | |
2076 | else if (formal_prec != TYPE_PRECISION (type1)) | |
2077 | warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1); | |
d45cf215 RS |
2078 | else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1)) |
2079 | ; | |
800cd3b9 RS |
2080 | /* Don't complain if the formal parameter type |
2081 | is an enum, because we can't tell now whether | |
2082 | the value was an enum--even the same enum. */ | |
2083 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
2084 | ; | |
400fbf9f JW |
2085 | else if (TREE_CODE (val) == INTEGER_CST |
2086 | && int_fits_type_p (val, type)) | |
2087 | /* Change in signedness doesn't matter | |
2088 | if a constant value is unaffected. */ | |
2089 | ; | |
4bbbc5d9 RS |
2090 | /* Likewise for a constant in a NOP_EXPR. */ |
2091 | else if (TREE_CODE (val) == NOP_EXPR | |
2092 | && TREE_CODE (TREE_OPERAND (val, 0)) == INTEGER_CST | |
2093 | && int_fits_type_p (TREE_OPERAND (val, 0), type)) | |
2094 | ; | |
2095 | #if 0 /* We never get such tree structure here. */ | |
047de90b RS |
2096 | else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE |
2097 | && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type) | |
2098 | && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type)) | |
2099 | /* Change in signedness doesn't matter | |
2100 | if an enum value is unaffected. */ | |
2101 | ; | |
4bbbc5d9 | 2102 | #endif |
ce9895ae RS |
2103 | /* If the value is extended from a narrower |
2104 | unsigned type, it doesn't matter whether we | |
2105 | pass it as signed or unsigned; the value | |
2106 | certainly is the same either way. */ | |
2107 | else if (TYPE_PRECISION (TREE_TYPE (val)) < TYPE_PRECISION (type) | |
2108 | && TREE_UNSIGNED (TREE_TYPE (val))) | |
2109 | ; | |
400fbf9f | 2110 | else if (TREE_UNSIGNED (type)) |
754a4d82 | 2111 | warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f | 2112 | else |
754a4d82 | 2113 | warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f JW |
2114 | } |
2115 | } | |
2116 | ||
2117 | parmval = convert_for_assignment (type, val, | |
2118 | (char *)0, /* arg passing */ | |
9b7267b8 | 2119 | fundecl, name, parmnum + 1); |
400fbf9f JW |
2120 | |
2121 | #ifdef PROMOTE_PROTOTYPES | |
2122 | if (TREE_CODE (type) == INTEGER_TYPE | |
2123 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2124 | parmval = default_conversion (parmval); | |
2125 | #endif | |
2126 | } | |
8d9bfdc5 | 2127 | result = tree_cons (NULL_TREE, parmval, result); |
400fbf9f JW |
2128 | } |
2129 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2130 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2131 | < TYPE_PRECISION (double_type_node))) | |
2132 | /* Convert `float' to `double'. */ | |
2133 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
2134 | else | |
2135 | /* Convert `short' and `char' to full-size `int'. */ | |
2136 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
2137 | ||
2138 | if (typetail) | |
2139 | typetail = TREE_CHAIN (typetail); | |
2140 | } | |
2141 | ||
2142 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) | |
2143 | { | |
2144 | if (name) | |
2145 | error ("too few arguments to function `%s'", | |
2146 | IDENTIFIER_POINTER (name)); | |
2147 | else | |
2148 | error ("too few arguments to function"); | |
2149 | } | |
2150 | ||
2151 | return nreverse (result); | |
2152 | } | |
2153 | \f | |
2154 | /* This is the entry point used by the parser | |
2155 | for binary operators in the input. | |
2156 | In addition to constructing the expression, | |
2157 | we check for operands that were written with other binary operators | |
2158 | in a way that is likely to confuse the user. */ | |
edc7c4ec | 2159 | |
400fbf9f JW |
2160 | tree |
2161 | parser_build_binary_op (code, arg1, arg2) | |
2162 | enum tree_code code; | |
2163 | tree arg1, arg2; | |
2164 | { | |
2165 | tree result = build_binary_op (code, arg1, arg2, 1); | |
2166 | ||
2167 | char class; | |
2168 | char class1 = TREE_CODE_CLASS (TREE_CODE (arg1)); | |
2169 | char class2 = TREE_CODE_CLASS (TREE_CODE (arg2)); | |
2170 | enum tree_code code1 = ERROR_MARK; | |
2171 | enum tree_code code2 = ERROR_MARK; | |
2172 | ||
2173 | if (class1 == 'e' || class1 == '1' | |
2174 | || class1 == '2' || class1 == '<') | |
2175 | code1 = C_EXP_ORIGINAL_CODE (arg1); | |
2176 | if (class2 == 'e' || class2 == '1' | |
2177 | || class2 == '2' || class2 == '<') | |
2178 | code2 = C_EXP_ORIGINAL_CODE (arg2); | |
2179 | ||
2180 | /* Check for cases such as x+y<<z which users are likely | |
2181 | to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE | |
2182 | is cleared to prevent these warnings. */ | |
2183 | if (warn_parentheses) | |
2184 | { | |
2185 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
2186 | { | |
2187 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2188 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2189 | warning ("suggest parentheses around + or - inside shift"); | |
2190 | } | |
2191 | ||
2192 | if (code == TRUTH_ORIF_EXPR) | |
2193 | { | |
2194 | if (code1 == TRUTH_ANDIF_EXPR | |
2195 | || code2 == TRUTH_ANDIF_EXPR) | |
2196 | warning ("suggest parentheses around && within ||"); | |
2197 | } | |
2198 | ||
2199 | if (code == BIT_IOR_EXPR) | |
2200 | { | |
2201 | if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR | |
2202 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2203 | || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR | |
2204 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2205 | warning ("suggest parentheses around arithmetic in operand of |"); | |
2206 | } | |
2207 | ||
2208 | if (code == BIT_XOR_EXPR) | |
2209 | { | |
2210 | if (code1 == BIT_AND_EXPR | |
2211 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2212 | || code2 == BIT_AND_EXPR | |
2213 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2214 | warning ("suggest parentheses around arithmetic in operand of ^"); | |
2215 | } | |
2216 | ||
2217 | if (code == BIT_AND_EXPR) | |
2218 | { | |
2219 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2220 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2221 | warning ("suggest parentheses around + or - in operand of &"); | |
2222 | } | |
2223 | } | |
2224 | ||
001af587 | 2225 | /* Similarly, check for cases like 1<=i<=10 that are probably errors. */ |
edc7c4ec | 2226 | if (TREE_CODE_CLASS (code) == '<' && extra_warnings |
001af587 RS |
2227 | && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')) |
2228 | warning ("comparisons like X<=Y<=Z do not have their mathematical meaning"); | |
2229 | ||
e58cd767 RS |
2230 | unsigned_conversion_warning (result, arg1); |
2231 | unsigned_conversion_warning (result, arg2); | |
2232 | overflow_warning (result); | |
2233 | ||
edc7c4ec RS |
2234 | class = TREE_CODE_CLASS (TREE_CODE (result)); |
2235 | ||
400fbf9f JW |
2236 | /* Record the code that was specified in the source, |
2237 | for the sake of warnings about confusing nesting. */ | |
2238 | if (class == 'e' || class == '1' | |
2239 | || class == '2' || class == '<') | |
2240 | C_SET_EXP_ORIGINAL_CODE (result, code); | |
2241 | else | |
2242 | { | |
2243 | int flag = TREE_CONSTANT (result); | |
d11fdb45 RS |
2244 | /* We used to use NOP_EXPR rather than NON_LVALUE_EXPR |
2245 | so that convert_for_assignment wouldn't strip it. | |
2246 | That way, we got warnings for things like p = (1 - 1). | |
2247 | But it turns out we should not get those warnings. */ | |
2248 | result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result); | |
400fbf9f JW |
2249 | C_SET_EXP_ORIGINAL_CODE (result, code); |
2250 | TREE_CONSTANT (result) = flag; | |
2251 | } | |
2252 | ||
2253 | return result; | |
2254 | } | |
2255 | ||
2256 | /* Build a binary-operation expression without default conversions. | |
2257 | CODE is the kind of expression to build. | |
2258 | This function differs from `build' in several ways: | |
2259 | the data type of the result is computed and recorded in it, | |
2260 | warnings are generated if arg data types are invalid, | |
2261 | special handling for addition and subtraction of pointers is known, | |
2262 | and some optimization is done (operations on narrow ints | |
2263 | are done in the narrower type when that gives the same result). | |
2264 | Constant folding is also done before the result is returned. | |
2265 | ||
2266 | Note that the operands will never have enumeral types, or function | |
2267 | or array types, because either they will have the default conversions | |
2268 | performed or they have both just been converted to some other type in which | |
2269 | the arithmetic is to be done. */ | |
2270 | ||
2271 | tree | |
2272 | build_binary_op (code, orig_op0, orig_op1, convert_p) | |
2273 | enum tree_code code; | |
2274 | tree orig_op0, orig_op1; | |
2275 | int convert_p; | |
2276 | { | |
2277 | tree type0, type1; | |
2278 | register enum tree_code code0, code1; | |
2279 | tree op0, op1; | |
2280 | ||
2281 | /* Expression code to give to the expression when it is built. | |
2282 | Normally this is CODE, which is what the caller asked for, | |
2283 | but in some special cases we change it. */ | |
2284 | register enum tree_code resultcode = code; | |
2285 | ||
2286 | /* Data type in which the computation is to be performed. | |
2287 | In the simplest cases this is the common type of the arguments. */ | |
2288 | register tree result_type = NULL; | |
2289 | ||
2290 | /* Nonzero means operands have already been type-converted | |
2291 | in whatever way is necessary. | |
2292 | Zero means they need to be converted to RESULT_TYPE. */ | |
2293 | int converted = 0; | |
2294 | ||
2295 | /* Nonzero means after finally constructing the expression | |
2296 | give it this type. Otherwise, give it type RESULT_TYPE. */ | |
2297 | tree final_type = 0; | |
2298 | ||
2299 | /* Nonzero if this is an operation like MIN or MAX which can | |
2300 | safely be computed in short if both args are promoted shorts. | |
2301 | Also implies COMMON. | |
2302 | -1 indicates a bitwise operation; this makes a difference | |
2303 | in the exact conditions for when it is safe to do the operation | |
2304 | in a narrower mode. */ | |
2305 | int shorten = 0; | |
2306 | ||
2307 | /* Nonzero if this is a comparison operation; | |
2308 | if both args are promoted shorts, compare the original shorts. | |
2309 | Also implies COMMON. */ | |
2310 | int short_compare = 0; | |
2311 | ||
2312 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
2313 | original short and then promoted if the operand is a promoted short. */ | |
2314 | int short_shift = 0; | |
2315 | ||
2316 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
2317 | int common = 0; | |
2318 | ||
2319 | if (convert_p) | |
2320 | { | |
2321 | op0 = default_conversion (orig_op0); | |
2322 | op1 = default_conversion (orig_op1); | |
2323 | } | |
2324 | else | |
2325 | { | |
2326 | op0 = orig_op0; | |
2327 | op1 = orig_op1; | |
2328 | } | |
2329 | ||
2330 | type0 = TREE_TYPE (op0); | |
2331 | type1 = TREE_TYPE (op1); | |
2332 | ||
2333 | /* The expression codes of the data types of the arguments tell us | |
2334 | whether the arguments are integers, floating, pointers, etc. */ | |
2335 | code0 = TREE_CODE (type0); | |
2336 | code1 = TREE_CODE (type1); | |
2337 | ||
fc76e425 | 2338 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce RS |
2339 | STRIP_TYPE_NOPS (op0); |
2340 | STRIP_TYPE_NOPS (op1); | |
400fbf9f JW |
2341 | |
2342 | /* If an error was already reported for one of the arguments, | |
2343 | avoid reporting another error. */ | |
2344 | ||
2345 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
2346 | return error_mark_node; | |
2347 | ||
2348 | switch (code) | |
2349 | { | |
2350 | case PLUS_EXPR: | |
2351 | /* Handle the pointer + int case. */ | |
2352 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2353 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
2354 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
2355 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
2356 | else | |
2357 | common = 1; | |
2358 | break; | |
2359 | ||
2360 | case MINUS_EXPR: | |
2361 | /* Subtraction of two similar pointers. | |
2362 | We must subtract them as integers, then divide by object size. */ | |
2363 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
2364 | && comp_target_types (type0, type1)) | |
2365 | return pointer_diff (op0, op1); | |
2366 | /* Handle pointer minus int. Just like pointer plus int. */ | |
2367 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2368 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
2369 | else | |
2370 | common = 1; | |
2371 | break; | |
2372 | ||
2373 | case MULT_EXPR: | |
2374 | common = 1; | |
2375 | break; | |
2376 | ||
2377 | case TRUNC_DIV_EXPR: | |
2378 | case CEIL_DIV_EXPR: | |
2379 | case FLOOR_DIV_EXPR: | |
2380 | case ROUND_DIV_EXPR: | |
2381 | case EXACT_DIV_EXPR: | |
b6a10c9f RS |
2382 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2383 | || code0 == COMPLEX_TYPE) | |
2384 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2385 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2386 | { |
2387 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) | |
2388 | resultcode = RDIV_EXPR; | |
2389 | else | |
6c9e1cb2 RS |
2390 | /* When dividing two signed integers, you have to promote to int. |
2391 | E.g. (short) -32868 / (short) -1 doesn't fit in a short. */ | |
2392 | shorten = TREE_UNSIGNED (op0); | |
400fbf9f JW |
2393 | common = 1; |
2394 | } | |
2395 | break; | |
2396 | ||
2397 | case BIT_AND_EXPR: | |
2398 | case BIT_ANDTC_EXPR: | |
2399 | case BIT_IOR_EXPR: | |
2400 | case BIT_XOR_EXPR: | |
2401 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2402 | shorten = -1; | |
2403 | /* If one operand is a constant, and the other is a short type | |
2404 | that has been converted to an int, | |
2405 | really do the work in the short type and then convert the | |
2406 | result to int. If we are lucky, the constant will be 0 or 1 | |
2407 | in the short type, making the entire operation go away. */ | |
2408 | if (TREE_CODE (op0) == INTEGER_CST | |
2409 | && TREE_CODE (op1) == NOP_EXPR | |
2410 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
2411 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
2412 | { | |
2413 | final_type = result_type; | |
2414 | op1 = TREE_OPERAND (op1, 0); | |
2415 | result_type = TREE_TYPE (op1); | |
2416 | } | |
2417 | if (TREE_CODE (op1) == INTEGER_CST | |
2418 | && TREE_CODE (op0) == NOP_EXPR | |
2419 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
2420 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
2421 | { | |
2422 | final_type = result_type; | |
2423 | op0 = TREE_OPERAND (op0, 0); | |
2424 | result_type = TREE_TYPE (op0); | |
2425 | } | |
2426 | break; | |
2427 | ||
2428 | case TRUNC_MOD_EXPR: | |
047de90b | 2429 | case FLOOR_MOD_EXPR: |
400fbf9f JW |
2430 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
2431 | shorten = 1; | |
2432 | break; | |
2433 | ||
2434 | case TRUTH_ANDIF_EXPR: | |
2435 | case TRUTH_ORIF_EXPR: | |
2436 | case TRUTH_AND_EXPR: | |
2437 | case TRUTH_OR_EXPR: | |
1eca8b1e | 2438 | case TRUTH_XOR_EXPR: |
b6a10c9f RS |
2439 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE |
2440 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) | |
2441 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE | |
2442 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2443 | { |
2444 | /* Result of these operations is always an int, | |
2445 | but that does not mean the operands should be | |
2446 | converted to ints! */ | |
2447 | result_type = integer_type_node; | |
2448 | op0 = truthvalue_conversion (op0); | |
2449 | op1 = truthvalue_conversion (op1); | |
2450 | converted = 1; | |
2451 | } | |
2452 | break; | |
2453 | ||
2454 | /* Shift operations: result has same type as first operand; | |
2455 | always convert second operand to int. | |
2456 | Also set SHORT_SHIFT if shifting rightward. */ | |
2457 | ||
2458 | case RSHIFT_EXPR: | |
2459 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2460 | { | |
2461 | if (TREE_CODE (op1) == INTEGER_CST) | |
2462 | { | |
17651386 | 2463 | if (tree_int_cst_lt (op1, integer_zero_node)) |
315da535 | 2464 | warning ("right shift count is negative"); |
17651386 RS |
2465 | else |
2466 | { | |
2467 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
2468 | short_shift = 1; | |
2469 | if (TREE_INT_CST_HIGH (op1) != 0 | |
2470 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2471 | >= TYPE_PRECISION (type0))) | |
315da535 | 2472 | warning ("right shift count >= width of type"); |
17651386 | 2473 | } |
400fbf9f | 2474 | } |
d45cf215 RS |
2475 | /* Use the type of the value to be shifted. |
2476 | This is what most traditional C compilers do. */ | |
2477 | result_type = type0; | |
400fbf9f JW |
2478 | /* Unless traditional, convert the shift-count to an integer, |
2479 | regardless of size of value being shifted. */ | |
2480 | if (! flag_traditional) | |
2481 | { | |
6cb72a7d | 2482 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2483 | op1 = convert (integer_type_node, op1); |
2484 | /* Avoid converting op1 to result_type later. */ | |
2485 | converted = 1; | |
2486 | } | |
400fbf9f JW |
2487 | } |
2488 | break; | |
2489 | ||
2490 | case LSHIFT_EXPR: | |
2491 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2492 | { | |
17651386 RS |
2493 | if (TREE_CODE (op1) == INTEGER_CST) |
2494 | { | |
2495 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
315da535 | 2496 | warning ("left shift count is negative"); |
17651386 RS |
2497 | else if (TREE_INT_CST_HIGH (op1) != 0 |
2498 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2499 | >= TYPE_PRECISION (type0))) | |
315da535 | 2500 | warning ("left shift count >= width of type"); |
17651386 | 2501 | } |
d45cf215 RS |
2502 | /* Use the type of the value to be shifted. |
2503 | This is what most traditional C compilers do. */ | |
2504 | result_type = type0; | |
400fbf9f JW |
2505 | /* Unless traditional, convert the shift-count to an integer, |
2506 | regardless of size of value being shifted. */ | |
2507 | if (! flag_traditional) | |
2508 | { | |
6cb72a7d | 2509 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2510 | op1 = convert (integer_type_node, op1); |
2511 | /* Avoid converting op1 to result_type later. */ | |
2512 | converted = 1; | |
2513 | } | |
400fbf9f JW |
2514 | } |
2515 | break; | |
2516 | ||
2517 | case RROTATE_EXPR: | |
2518 | case LROTATE_EXPR: | |
2519 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2520 | { | |
17651386 RS |
2521 | if (TREE_CODE (op1) == INTEGER_CST) |
2522 | { | |
2523 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
2524 | warning ("shift count is negative"); | |
2525 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
2526 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2527 | >= TYPE_PRECISION (type0))) | |
2528 | warning ("shift count >= width of type"); | |
2529 | } | |
d45cf215 RS |
2530 | /* Use the type of the value to be shifted. |
2531 | This is what most traditional C compilers do. */ | |
2532 | result_type = type0; | |
400fbf9f JW |
2533 | /* Unless traditional, convert the shift-count to an integer, |
2534 | regardless of size of value being shifted. */ | |
2535 | if (! flag_traditional) | |
2536 | { | |
6cb72a7d | 2537 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2538 | op1 = convert (integer_type_node, op1); |
2539 | /* Avoid converting op1 to result_type later. */ | |
2540 | converted = 1; | |
2541 | } | |
400fbf9f JW |
2542 | } |
2543 | break; | |
2544 | ||
2545 | case EQ_EXPR: | |
2546 | case NE_EXPR: | |
2547 | /* Result of comparison is always int, | |
2548 | but don't convert the args to int! */ | |
2549 | result_type = integer_type_node; | |
2550 | converted = 1; | |
b6a10c9f RS |
2551 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2552 | || code0 == COMPLEX_TYPE) | |
2553 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2554 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2555 | short_compare = 1; |
2556 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2557 | { | |
2558 | register tree tt0 = TREE_TYPE (type0); | |
2559 | register tree tt1 = TREE_TYPE (type1); | |
2560 | /* Anything compares with void *. void * compares with anything. | |
d11fdb45 RS |
2561 | Otherwise, the targets must be compatible |
2562 | and both must be object or both incomplete. */ | |
400fbf9f JW |
2563 | if (comp_target_types (type0, type1)) |
2564 | ; | |
2565 | else if (TYPE_MAIN_VARIANT (tt0) == void_type_node) | |
2566 | { | |
2567 | if (pedantic && !integer_zerop (op0) | |
2568 | && TREE_CODE (tt1) == FUNCTION_TYPE) | |
2569 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2570 | } | |
2571 | else if (TYPE_MAIN_VARIANT (tt1) == void_type_node) | |
2572 | { | |
2573 | if (pedantic && !integer_zerop (op1) | |
2574 | && TREE_CODE (tt0) == FUNCTION_TYPE) | |
2575 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2576 | } | |
2577 | else | |
2578 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2579 | } | |
2580 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2581 | && integer_zerop (op1)) | |
2582 | op1 = null_pointer_node; | |
2583 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2584 | && integer_zerop (op0)) | |
2585 | op0 = null_pointer_node; | |
2586 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2587 | { | |
2588 | if (! flag_traditional) | |
2589 | pedwarn ("comparison between pointer and integer"); | |
2590 | op1 = convert (TREE_TYPE (op0), op1); | |
2591 | } | |
2592 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2593 | { | |
2594 | if (! flag_traditional) | |
2595 | pedwarn ("comparison between pointer and integer"); | |
2596 | op0 = convert (TREE_TYPE (op1), op0); | |
2597 | } | |
2598 | else | |
2599 | /* If args are not valid, clear out RESULT_TYPE | |
2600 | to cause an error message later. */ | |
2601 | result_type = 0; | |
2602 | break; | |
2603 | ||
2604 | case MAX_EXPR: | |
2605 | case MIN_EXPR: | |
b6a10c9f RS |
2606 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2607 | || code0 == COMPLEX_TYPE) | |
2608 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2609 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2610 | shorten = 1; |
2611 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2612 | { | |
2613 | if (! comp_target_types (type0, type1)) | |
2614 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2615 | else if (pedantic | |
2616 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2617 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2618 | result_type = common_type (type0, type1); | |
2619 | } | |
2620 | break; | |
2621 | ||
2622 | case LE_EXPR: | |
2623 | case GE_EXPR: | |
2624 | case LT_EXPR: | |
2625 | case GT_EXPR: | |
b6a10c9f RS |
2626 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2627 | || code0 == COMPLEX_TYPE) | |
2628 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2629 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2630 | short_compare = 1; |
2631 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2632 | { | |
2633 | if (! comp_target_types (type0, type1)) | |
2634 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
d11fdb45 RS |
2635 | else if ((TYPE_SIZE (TREE_TYPE (type0)) != 0) |
2636 | != (TYPE_SIZE (TREE_TYPE (type1)) != 0)) | |
2637 | pedwarn ("comparison of complete and incomplete pointers"); | |
400fbf9f JW |
2638 | else if (pedantic |
2639 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2640 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2641 | result_type = integer_type_node; | |
2642 | } | |
2643 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2644 | && integer_zerop (op1)) | |
2645 | { | |
2646 | result_type = integer_type_node; | |
2647 | op1 = null_pointer_node; | |
2648 | if (! flag_traditional) | |
2649 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2650 | } | |
2651 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2652 | && integer_zerop (op0)) | |
2653 | { | |
2654 | result_type = integer_type_node; | |
2655 | op0 = null_pointer_node; | |
2656 | if (pedantic) | |
2657 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2658 | } | |
2659 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2660 | { | |
2661 | result_type = integer_type_node; | |
2662 | if (! flag_traditional) | |
2663 | pedwarn ("comparison between pointer and integer"); | |
2664 | op1 = convert (TREE_TYPE (op0), op1); | |
2665 | } | |
2666 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2667 | { | |
2668 | result_type = integer_type_node; | |
2669 | if (! flag_traditional) | |
2670 | pedwarn ("comparison between pointer and integer"); | |
2671 | op0 = convert (TREE_TYPE (op1), op0); | |
2672 | } | |
2673 | converted = 1; | |
2674 | break; | |
2675 | } | |
2676 | ||
b6a10c9f RS |
2677 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) |
2678 | && | |
2679 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f | 2680 | { |
b6a10c9f RS |
2681 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
2682 | ||
400fbf9f JW |
2683 | if (shorten || common || short_compare) |
2684 | result_type = common_type (type0, type1); | |
2685 | ||
2686 | /* For certain operations (which identify themselves by shorten != 0) | |
2687 | if both args were extended from the same smaller type, | |
2688 | do the arithmetic in that type and then extend. | |
2689 | ||
2690 | shorten !=0 and !=1 indicates a bitwise operation. | |
2691 | For them, this optimization is safe only if | |
2692 | both args are zero-extended or both are sign-extended. | |
2693 | Otherwise, we might change the result. | |
2694 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
2695 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
2696 | ||
b6a10c9f | 2697 | if (shorten && none_complex) |
400fbf9f JW |
2698 | { |
2699 | int unsigned0, unsigned1; | |
2700 | tree arg0 = get_narrower (op0, &unsigned0); | |
2701 | tree arg1 = get_narrower (op1, &unsigned1); | |
2702 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
2703 | int uns = TREE_UNSIGNED (result_type); | |
2704 | tree type; | |
2705 | ||
2706 | final_type = result_type; | |
2707 | ||
e7951b3f | 2708 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
400fbf9f JW |
2709 | but it *requires* conversion to FINAL_TYPE. */ |
2710 | ||
e7951b3f RS |
2711 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
2712 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2713 | && TREE_TYPE (op0) != final_type) | |
400fbf9f | 2714 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); |
e7951b3f RS |
2715 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
2716 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
2717 | && TREE_TYPE (op1) != final_type) | |
400fbf9f JW |
2718 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); |
2719 | ||
2720 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
2721 | ||
2722 | /* For bitwise operations, signedness of nominal type | |
2723 | does not matter. Consider only how operands were extended. */ | |
2724 | if (shorten == -1) | |
2725 | uns = unsigned0; | |
2726 | ||
2727 | /* Note that in all three cases below we refrain from optimizing | |
2728 | an unsigned operation on sign-extended args. | |
2729 | That would not be valid. */ | |
2730 | ||
2731 | /* Both args variable: if both extended in same way | |
2732 | from same width, do it in that width. | |
2733 | Do it unsigned if args were zero-extended. */ | |
2734 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
2735 | < TYPE_PRECISION (result_type)) | |
2736 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2737 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2738 | && unsigned0 == unsigned1 | |
2739 | && (unsigned0 || !uns)) | |
2740 | result_type | |
2741 | = signed_or_unsigned_type (unsigned0, | |
2742 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
2743 | else if (TREE_CODE (arg0) == INTEGER_CST | |
2744 | && (unsigned1 || !uns) | |
2745 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2746 | < TYPE_PRECISION (result_type)) | |
2747 | && (type = signed_or_unsigned_type (unsigned1, | |
2748 | TREE_TYPE (arg1)), | |
2749 | int_fits_type_p (arg0, type))) | |
2750 | result_type = type; | |
2751 | else if (TREE_CODE (arg1) == INTEGER_CST | |
2752 | && (unsigned0 || !uns) | |
2753 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
2754 | < TYPE_PRECISION (result_type)) | |
2755 | && (type = signed_or_unsigned_type (unsigned0, | |
2756 | TREE_TYPE (arg0)), | |
2757 | int_fits_type_p (arg1, type))) | |
2758 | result_type = type; | |
2759 | } | |
2760 | ||
2761 | /* Shifts can be shortened if shifting right. */ | |
2762 | ||
2763 | if (short_shift) | |
2764 | { | |
2765 | int unsigned_arg; | |
2766 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
2767 | ||
2768 | final_type = result_type; | |
2769 | ||
2770 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
2771 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
2772 | ||
2773 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
2774 | /* If arg is sign-extended and then unsigned-shifted, | |
2775 | we can simulate this with a signed shift in arg's type | |
2776 | only if the extended result is at least twice as wide | |
2777 | as the arg. Otherwise, the shift could use up all the | |
2778 | ones made by sign-extension and bring in zeros. | |
2779 | We can't optimize that case at all, but in most machines | |
2780 | it never happens because available widths are 2**N. */ | |
2781 | && (!TREE_UNSIGNED (final_type) | |
2782 | || unsigned_arg | |
2783 | || 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type))) | |
2784 | { | |
2785 | /* Do an unsigned shift if the operand was zero-extended. */ | |
2786 | result_type | |
2787 | = signed_or_unsigned_type (unsigned_arg, | |
2788 | TREE_TYPE (arg0)); | |
2789 | /* Convert value-to-be-shifted to that type. */ | |
2790 | if (TREE_TYPE (op0) != result_type) | |
2791 | op0 = convert (result_type, op0); | |
2792 | converted = 1; | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | /* Comparison operations are shortened too but differently. | |
2797 | They identify themselves by setting short_compare = 1. */ | |
2798 | ||
b6a10c9f | 2799 | if (short_compare && none_complex) |
400fbf9f JW |
2800 | { |
2801 | /* Don't write &op0, etc., because that would prevent op0 | |
2802 | from being kept in a register. | |
2803 | Instead, make copies of the our local variables and | |
2804 | pass the copies by reference, then copy them back afterward. */ | |
2805 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
2806 | enum tree_code xresultcode = resultcode; | |
2807 | tree val | |
2808 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
2809 | if (val != 0) | |
2810 | return val; | |
2811 | op0 = xop0, op1 = xop1, result_type = xresult_type; | |
2812 | resultcode = xresultcode; | |
2813 | ||
2814 | if (extra_warnings) | |
2815 | { | |
2816 | tree op0_type = TREE_TYPE (orig_op0); | |
2817 | tree op1_type = TREE_TYPE (orig_op1); | |
2818 | int op0_unsigned = TREE_UNSIGNED (op0_type); | |
2819 | int op1_unsigned = TREE_UNSIGNED (op1_type); | |
2820 | ||
2821 | /* Give warnings for comparisons between signed and unsigned | |
2822 | quantities that will fail. Do not warn if the signed quantity | |
2823 | is an unsuffixed integer literal (or some static constant | |
2824 | expression involving such literals) and it is positive. | |
2825 | Do not warn if the width of the unsigned quantity is less | |
2826 | than that of the signed quantity, since in this case all | |
2827 | values of the unsigned quantity fit in the signed quantity. | |
2828 | Do not warn if the signed type is the same size as the | |
2829 | result_type since sign extension does not cause trouble in | |
2830 | this case. */ | |
2831 | /* Do the checking based on the original operand trees, so that | |
2832 | casts will be considered, but default promotions won't be. */ | |
2833 | if (op0_unsigned != op1_unsigned | |
2834 | && ((op0_unsigned | |
2835 | && TYPE_PRECISION (op0_type) >= TYPE_PRECISION (op1_type) | |
2836 | && TYPE_PRECISION (op0_type) < TYPE_PRECISION (result_type) | |
2837 | && (TREE_CODE (op1) != INTEGER_CST | |
2838 | || (TREE_CODE (op1) == INTEGER_CST | |
2839 | && INT_CST_LT (op1, integer_zero_node)))) | |
2840 | || | |
2841 | (op1_unsigned | |
2842 | && TYPE_PRECISION (op1_type) >= TYPE_PRECISION (op0_type) | |
2843 | && TYPE_PRECISION (op1_type) < TYPE_PRECISION (result_type) | |
2844 | && (TREE_CODE (op0) != INTEGER_CST | |
2845 | || (TREE_CODE (op0) == INTEGER_CST | |
2846 | && INT_CST_LT (op0, integer_zero_node)))))) | |
2847 | warning ("comparison between signed and unsigned"); | |
2848 | } | |
2849 | } | |
2850 | } | |
2851 | ||
2852 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
2853 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
2854 | Then the expression will be built. | |
2855 | It will be given type FINAL_TYPE if that is nonzero; | |
2856 | otherwise, it will be given type RESULT_TYPE. */ | |
2857 | ||
2858 | if (!result_type) | |
2859 | { | |
2860 | binary_op_error (code); | |
2861 | return error_mark_node; | |
2862 | } | |
2863 | ||
2864 | if (! converted) | |
2865 | { | |
2866 | if (TREE_TYPE (op0) != result_type) | |
2867 | op0 = convert (result_type, op0); | |
2868 | if (TREE_TYPE (op1) != result_type) | |
2869 | op1 = convert (result_type, op1); | |
2870 | } | |
2871 | ||
2872 | { | |
2873 | register tree result = build (resultcode, result_type, op0, op1); | |
2874 | register tree folded; | |
2875 | ||
2876 | folded = fold (result); | |
2877 | if (folded == result) | |
2878 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2879 | if (final_type != 0) | |
2880 | return convert (final_type, folded); | |
2881 | return folded; | |
2882 | } | |
2883 | } | |
2884 | \f | |
2885 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
2886 | of pointer PTROP and integer INTOP. */ | |
2887 | ||
2888 | static tree | |
2889 | pointer_int_sum (resultcode, ptrop, intop) | |
2890 | enum tree_code resultcode; | |
2891 | register tree ptrop, intop; | |
2892 | { | |
2893 | tree size_exp; | |
2894 | ||
2895 | register tree result; | |
2896 | register tree folded; | |
2897 | ||
2898 | /* The result is a pointer of the same type that is being added. */ | |
2899 | ||
2900 | register tree result_type = TREE_TYPE (ptrop); | |
2901 | ||
2902 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2903 | { | |
2904 | if (pedantic || warn_pointer_arith) | |
2905 | pedwarn ("pointer of type `void *' used in arithmetic"); | |
2906 | size_exp = integer_one_node; | |
2907 | } | |
2908 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2909 | { | |
2910 | if (pedantic || warn_pointer_arith) | |
2911 | pedwarn ("pointer to a function used in arithmetic"); | |
2912 | size_exp = integer_one_node; | |
2913 | } | |
2914 | else | |
2915 | size_exp = c_size_in_bytes (TREE_TYPE (result_type)); | |
2916 | ||
2917 | /* If what we are about to multiply by the size of the elements | |
2918 | contains a constant term, apply distributive law | |
2919 | and multiply that constant term separately. | |
2920 | This helps produce common subexpressions. */ | |
2921 | ||
2922 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
2923 | && ! TREE_CONSTANT (intop) | |
2924 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
2925 | && TREE_CONSTANT (size_exp) | |
2926 | /* If the constant comes from pointer subtraction, | |
2927 | skip this optimization--it would cause an error. */ | |
2928 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE) | |
2929 | { | |
2930 | enum tree_code subcode = resultcode; | |
d45cf215 | 2931 | tree int_type = TREE_TYPE (intop); |
400fbf9f JW |
2932 | if (TREE_CODE (intop) == MINUS_EXPR) |
2933 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
d45cf215 RS |
2934 | /* Convert both subexpression types to the type of intop, |
2935 | because weird cases involving pointer arithmetic | |
2936 | can result in a sum or difference with different type args. */ | |
2937 | ptrop = build_binary_op (subcode, ptrop, | |
2938 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2939 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
400fbf9f JW |
2940 | } |
2941 | ||
2942 | /* Convert the integer argument to a type the same size as a pointer | |
2943 | so the multiply won't overflow spuriously. */ | |
2944 | ||
2945 | if (TYPE_PRECISION (TREE_TYPE (intop)) != POINTER_SIZE) | |
2946 | intop = convert (type_for_size (POINTER_SIZE, 0), intop); | |
2947 | ||
2948 | /* Replace the integer argument | |
2949 | with a suitable product by the object size. */ | |
2950 | ||
2951 | intop = build_binary_op (MULT_EXPR, intop, size_exp, 1); | |
2952 | ||
2953 | /* Create the sum or difference. */ | |
2954 | ||
2955 | result = build (resultcode, result_type, ptrop, intop); | |
2956 | ||
2957 | folded = fold (result); | |
2958 | if (folded == result) | |
2959 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
2960 | return folded; | |
2961 | } | |
2962 | ||
2963 | /* Return a tree for the difference of pointers OP0 and OP1. | |
2964 | The resulting tree has type int. */ | |
2965 | ||
2966 | static tree | |
2967 | pointer_diff (op0, op1) | |
2968 | register tree op0, op1; | |
2969 | { | |
2970 | register tree result, folded; | |
2971 | tree restype = ptrdiff_type_node; | |
2972 | ||
2973 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
2974 | ||
2975 | if (pedantic || warn_pointer_arith) | |
2976 | { | |
2977 | if (TREE_CODE (target_type) == VOID_TYPE) | |
2978 | pedwarn ("pointer of type `void *' used in subtraction"); | |
2979 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
2980 | pedwarn ("pointer to a function used in subtraction"); | |
2981 | } | |
2982 | ||
2983 | /* First do the subtraction as integers; | |
2984 | then drop through to build the divide operator. */ | |
2985 | ||
2986 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), | |
2987 | convert (restype, op1), 1); | |
ea8dd784 JW |
2988 | /* This generates an error if op1 is pointer to incomplete type. */ |
2989 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) | |
2990 | error ("arithmetic on pointer to an incomplete type"); | |
2991 | /* This generates an error if op0 is pointer to incomplete type. */ | |
400fbf9f JW |
2992 | op1 = c_size_in_bytes (target_type); |
2993 | ||
2994 | /* Divide by the size, in easiest possible way. */ | |
2995 | ||
2996 | result = build (EXACT_DIV_EXPR, restype, op0, op1); | |
2997 | ||
2998 | folded = fold (result); | |
2999 | if (folded == result) | |
3000 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3001 | return folded; | |
3002 | } | |
3003 | \f | |
3004 | /* Construct and perhaps optimize a tree representation | |
3005 | for a unary operation. CODE, a tree_code, specifies the operation | |
3006 | and XARG is the operand. NOCONVERT nonzero suppresses | |
3007 | the default promotions (such as from short to int). */ | |
3008 | ||
3009 | tree | |
3010 | build_unary_op (code, xarg, noconvert) | |
3011 | enum tree_code code; | |
3012 | tree xarg; | |
3013 | int noconvert; | |
3014 | { | |
3015 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
3016 | register tree arg = xarg; | |
3017 | register tree argtype = 0; | |
3018 | register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); | |
3019 | char *errstring = NULL; | |
3020 | tree val; | |
3021 | ||
3022 | if (typecode == ERROR_MARK) | |
3023 | return error_mark_node; | |
3024 | if (typecode == ENUMERAL_TYPE) | |
3025 | typecode = INTEGER_TYPE; | |
3026 | ||
3027 | switch (code) | |
3028 | { | |
3029 | case CONVERT_EXPR: | |
3030 | /* This is used for unary plus, because a CONVERT_EXPR | |
3031 | is enough to prevent anybody from looking inside for | |
3032 | associativity, but won't generate any code. */ | |
b6a10c9f RS |
3033 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
3034 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
3035 | errstring = "wrong type argument to unary plus"; |
3036 | else if (!noconvert) | |
3037 | arg = default_conversion (arg); | |
3038 | break; | |
3039 | ||
3040 | case NEGATE_EXPR: | |
b6a10c9f RS |
3041 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
3042 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
3043 | errstring = "wrong type argument to unary minus"; |
3044 | else if (!noconvert) | |
3045 | arg = default_conversion (arg); | |
3046 | break; | |
3047 | ||
3048 | case BIT_NOT_EXPR: | |
1c2a9b35 RS |
3049 | if (typecode == COMPLEX_TYPE) |
3050 | { | |
3051 | code = CONJ_EXPR; | |
3052 | if (!noconvert) | |
3053 | arg = default_conversion (arg); | |
3054 | } | |
3055 | else if (typecode != INTEGER_TYPE) | |
400fbf9f JW |
3056 | errstring = "wrong type argument to bit-complement"; |
3057 | else if (!noconvert) | |
3058 | arg = default_conversion (arg); | |
3059 | break; | |
3060 | ||
3061 | case ABS_EXPR: | |
b6a10c9f RS |
3062 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
3063 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
3064 | errstring = "wrong type argument to abs"; |
3065 | else if (!noconvert) | |
3066 | arg = default_conversion (arg); | |
3067 | break; | |
3068 | ||
1c2a9b35 RS |
3069 | case CONJ_EXPR: |
3070 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
3071 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE | |
3072 | || typecode == COMPLEX_TYPE)) | |
3073 | errstring = "wrong type argument to conjugation"; | |
3074 | else if (!noconvert) | |
3075 | arg = default_conversion (arg); | |
3076 | break; | |
3077 | ||
400fbf9f JW |
3078 | case TRUTH_NOT_EXPR: |
3079 | if (typecode != INTEGER_TYPE | |
3080 | && typecode != REAL_TYPE && typecode != POINTER_TYPE | |
b6a10c9f | 3081 | && typecode != COMPLEX_TYPE |
400fbf9f JW |
3082 | /* These will convert to a pointer. */ |
3083 | && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE) | |
3084 | { | |
3085 | errstring = "wrong type argument to unary exclamation mark"; | |
3086 | break; | |
3087 | } | |
3088 | arg = truthvalue_conversion (arg); | |
3089 | return invert_truthvalue (arg); | |
3090 | ||
3091 | case NOP_EXPR: | |
3092 | break; | |
b6a10c9f RS |
3093 | |
3094 | case REALPART_EXPR: | |
3095 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3096 | return TREE_REALPART (arg); | |
3097 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
3098 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
3099 | else | |
3100 | return arg; | |
3101 | ||
3102 | case IMAGPART_EXPR: | |
3103 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3104 | return TREE_IMAGPART (arg); | |
3105 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
3106 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
3107 | else | |
3108 | return convert (TREE_TYPE (arg), integer_zero_node); | |
400fbf9f JW |
3109 | |
3110 | case PREINCREMENT_EXPR: | |
3111 | case POSTINCREMENT_EXPR: | |
3112 | case PREDECREMENT_EXPR: | |
3113 | case POSTDECREMENT_EXPR: | |
3114 | /* Handle complex lvalues (when permitted) | |
3115 | by reduction to simpler cases. */ | |
3116 | ||
3117 | val = unary_complex_lvalue (code, arg); | |
3118 | if (val != 0) | |
3119 | return val; | |
3120 | ||
b6a10c9f RS |
3121 | /* Increment or decrement the real part of the value, |
3122 | and don't change the imaginary part. */ | |
3123 | if (typecode == COMPLEX_TYPE) | |
3124 | { | |
3125 | tree real, imag; | |
3126 | ||
3127 | arg = stabilize_reference (arg); | |
3128 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
3129 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
3130 | return build (COMPLEX_EXPR, TREE_TYPE (arg), | |
3131 | build_unary_op (code, real, 1), imag); | |
3132 | } | |
3133 | ||
400fbf9f JW |
3134 | /* Report invalid types. */ |
3135 | ||
3136 | if (typecode != POINTER_TYPE | |
3137 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) | |
3138 | { | |
3139 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
3140 | errstring ="wrong type argument to increment"; | |
3141 | else | |
3142 | errstring ="wrong type argument to decrement"; | |
3143 | break; | |
3144 | } | |
3145 | ||
3146 | { | |
3147 | register tree inc; | |
3148 | tree result_type = TREE_TYPE (arg); | |
3149 | ||
3150 | arg = get_unwidened (arg, 0); | |
3151 | argtype = TREE_TYPE (arg); | |
3152 | ||
3153 | /* Compute the increment. */ | |
3154 | ||
3155 | if (typecode == POINTER_TYPE) | |
3156 | { | |
6bc4e3d0 RS |
3157 | /* If pointer target is an undefined struct, |
3158 | we just cannot know how to do the arithmetic. */ | |
3159 | if (TYPE_SIZE (TREE_TYPE (result_type)) == 0) | |
3160 | error ("%s of pointer to unknown structure", | |
3161 | ((code == PREINCREMENT_EXPR | |
3162 | || code == POSTINCREMENT_EXPR) | |
3163 | ? "increment" : "decrement")); | |
3164 | else if ((pedantic || warn_pointer_arith) | |
3165 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
3166 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
400fbf9f JW |
3167 | pedwarn ("wrong type argument to %s", |
3168 | ((code == PREINCREMENT_EXPR | |
3169 | || code == POSTINCREMENT_EXPR) | |
3170 | ? "increment" : "decrement")); | |
3171 | inc = c_sizeof_nowarn (TREE_TYPE (result_type)); | |
3172 | } | |
3173 | else | |
3174 | inc = integer_one_node; | |
3175 | ||
3176 | inc = convert (argtype, inc); | |
3177 | ||
3178 | /* Handle incrementing a cast-expression. */ | |
3179 | ||
3180 | while (1) | |
3181 | switch (TREE_CODE (arg)) | |
3182 | { | |
3183 | case NOP_EXPR: | |
3184 | case CONVERT_EXPR: | |
3185 | case FLOAT_EXPR: | |
3186 | case FIX_TRUNC_EXPR: | |
3187 | case FIX_FLOOR_EXPR: | |
3188 | case FIX_ROUND_EXPR: | |
3189 | case FIX_CEIL_EXPR: | |
ee71df46 | 3190 | pedantic_lvalue_warning (CONVERT_EXPR); |
400fbf9f JW |
3191 | /* If the real type has the same machine representation |
3192 | as the type it is cast to, we can make better output | |
3193 | by adding directly to the inside of the cast. */ | |
3194 | if ((TREE_CODE (TREE_TYPE (arg)) | |
3195 | == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
3196 | && (TYPE_MODE (TREE_TYPE (arg)) | |
3197 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0))))) | |
3198 | arg = TREE_OPERAND (arg, 0); | |
3199 | else | |
3200 | { | |
3201 | tree incremented, modify, value; | |
400fbf9f JW |
3202 | arg = stabilize_reference (arg); |
3203 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
3204 | value = arg; | |
3205 | else | |
3206 | value = save_expr (arg); | |
3207 | incremented = build (((code == PREINCREMENT_EXPR | |
3208 | || code == POSTINCREMENT_EXPR) | |
3209 | ? PLUS_EXPR : MINUS_EXPR), | |
3210 | argtype, value, inc); | |
3211 | TREE_SIDE_EFFECTS (incremented) = 1; | |
3212 | modify = build_modify_expr (arg, NOP_EXPR, incremented); | |
3213 | value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); | |
3214 | TREE_USED (value) = 1; | |
3215 | return value; | |
3216 | } | |
3217 | break; | |
3218 | ||
3219 | default: | |
3220 | goto give_up; | |
3221 | } | |
3222 | give_up: | |
3223 | ||
3224 | /* Complain about anything else that is not a true lvalue. */ | |
3225 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
3226 | || code == POSTINCREMENT_EXPR) | |
3227 | ? "increment" : "decrement"))) | |
3228 | return error_mark_node; | |
3229 | ||
3230 | /* Report a read-only lvalue. */ | |
26b3c423 | 3231 | if (TREE_READONLY (arg)) |
400fbf9f JW |
3232 | readonly_warning (arg, |
3233 | ((code == PREINCREMENT_EXPR | |
3234 | || code == POSTINCREMENT_EXPR) | |
3235 | ? "increment" : "decrement")); | |
3236 | ||
3237 | val = build (code, TREE_TYPE (arg), arg, inc); | |
3238 | TREE_SIDE_EFFECTS (val) = 1; | |
3239 | val = convert (result_type, val); | |
3240 | if (TREE_CODE (val) != code) | |
3241 | TREE_NO_UNUSED_WARNING (val) = 1; | |
3242 | return val; | |
3243 | } | |
3244 | ||
3245 | case ADDR_EXPR: | |
3246 | /* Note that this operation never does default_conversion | |
3247 | regardless of NOCONVERT. */ | |
3248 | ||
3249 | /* Let &* cancel out to simplify resulting code. */ | |
3250 | if (TREE_CODE (arg) == INDIRECT_REF) | |
3251 | { | |
3252 | /* Don't let this be an lvalue. */ | |
3253 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
3254 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
3255 | return TREE_OPERAND (arg, 0); | |
3256 | } | |
3257 | ||
3258 | /* For &x[y], return x+y */ | |
3259 | if (TREE_CODE (arg) == ARRAY_REF) | |
3260 | { | |
3261 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
3262 | return error_mark_node; | |
3263 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
3264 | TREE_OPERAND (arg, 1), 1); | |
3265 | } | |
3266 | ||
3267 | /* Handle complex lvalues (when permitted) | |
3268 | by reduction to simpler cases. */ | |
3269 | val = unary_complex_lvalue (code, arg); | |
3270 | if (val != 0) | |
3271 | return val; | |
3272 | ||
3273 | #if 0 /* Turned off because inconsistent; | |
3274 | float f; *&(int)f = 3.4 stores in int format | |
3275 | whereas (int)f = 3.4 stores in float format. */ | |
3276 | /* Address of a cast is just a cast of the address | |
3277 | of the operand of the cast. */ | |
3278 | switch (TREE_CODE (arg)) | |
3279 | { | |
3280 | case NOP_EXPR: | |
3281 | case CONVERT_EXPR: | |
3282 | case FLOAT_EXPR: | |
3283 | case FIX_TRUNC_EXPR: | |
3284 | case FIX_FLOOR_EXPR: | |
3285 | case FIX_ROUND_EXPR: | |
3286 | case FIX_CEIL_EXPR: | |
3287 | if (pedantic) | |
3288 | pedwarn ("ANSI C forbids the address of a cast expression"); | |
3289 | return convert (build_pointer_type (TREE_TYPE (arg)), | |
3290 | build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), | |
3291 | 0)); | |
3292 | } | |
3293 | #endif | |
3294 | ||
3295 | /* Allow the address of a constructor if all the elements | |
3296 | are constant. */ | |
3297 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
3298 | ; | |
3299 | /* Anything not already handled and not a true memory reference | |
3300 | is an error. */ | |
3301 | else if (typecode != FUNCTION_TYPE && !lvalue_or_else (arg, "unary `&'")) | |
3302 | return error_mark_node; | |
3303 | ||
3304 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
3305 | argtype = TREE_TYPE (arg); | |
3306 | /* If the lvalue is const or volatile, | |
3307 | merge that into the type that the address will point to. */ | |
3308 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
3309 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
3310 | { | |
3311 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
3312 | argtype = c_build_type_variant (argtype, | |
3313 | TREE_READONLY (arg), | |
3314 | TREE_THIS_VOLATILE (arg)); | |
3315 | } | |
3316 | ||
3317 | argtype = build_pointer_type (argtype); | |
3318 | ||
3319 | if (mark_addressable (arg) == 0) | |
3320 | return error_mark_node; | |
3321 | ||
3322 | { | |
3323 | tree addr; | |
3324 | ||
3325 | if (TREE_CODE (arg) == COMPONENT_REF) | |
3326 | { | |
3327 | tree field = TREE_OPERAND (arg, 1); | |
3328 | ||
3329 | addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3330 | ||
3331 | if (DECL_BIT_FIELD (field)) | |
3332 | { | |
3333 | error ("attempt to take address of bit-field structure member `%s'", | |
3334 | IDENTIFIER_POINTER (DECL_NAME (field))); | |
3335 | return error_mark_node; | |
3336 | } | |
3337 | ||
3338 | addr = convert (argtype, addr); | |
3339 | ||
3340 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
3341 | { | |
3342 | tree offset | |
3343 | = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
3344 | size_int (BITS_PER_UNIT)); | |
3345 | int flag = TREE_CONSTANT (addr); | |
3346 | addr = fold (build (PLUS_EXPR, argtype, | |
3347 | addr, convert (argtype, offset))); | |
3348 | TREE_CONSTANT (addr) = flag; | |
3349 | } | |
3350 | } | |
3351 | else | |
3352 | addr = build1 (code, argtype, arg); | |
3353 | ||
3354 | /* Address of a static or external variable or | |
8706edbc RS |
3355 | file-scope function counts as a constant. */ |
3356 | if (staticp (arg) | |
3357 | && ! (TREE_CODE (arg) == FUNCTION_DECL | |
3358 | && DECL_CONTEXT (arg) != 0)) | |
7d2d49af | 3359 | TREE_CONSTANT (addr) = 1; |
400fbf9f JW |
3360 | return addr; |
3361 | } | |
3362 | } | |
3363 | ||
3364 | if (!errstring) | |
3365 | { | |
3366 | if (argtype == 0) | |
3367 | argtype = TREE_TYPE (arg); | |
3368 | return fold (build1 (code, argtype, arg)); | |
3369 | } | |
3370 | ||
3371 | error (errstring); | |
3372 | return error_mark_node; | |
3373 | } | |
3374 | ||
3375 | #if 0 | |
3376 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, | |
3377 | convert ARG with the same conversions in the same order | |
3378 | and return the result. */ | |
3379 | ||
3380 | static tree | |
3381 | convert_sequence (conversions, arg) | |
3382 | tree conversions; | |
3383 | tree arg; | |
3384 | { | |
3385 | switch (TREE_CODE (conversions)) | |
3386 | { | |
3387 | case NOP_EXPR: | |
3388 | case CONVERT_EXPR: | |
3389 | case FLOAT_EXPR: | |
3390 | case FIX_TRUNC_EXPR: | |
3391 | case FIX_FLOOR_EXPR: | |
3392 | case FIX_ROUND_EXPR: | |
3393 | case FIX_CEIL_EXPR: | |
3394 | return convert (TREE_TYPE (conversions), | |
3395 | convert_sequence (TREE_OPERAND (conversions, 0), | |
3396 | arg)); | |
3397 | ||
3398 | default: | |
3399 | return arg; | |
3400 | } | |
3401 | } | |
3402 | #endif /* 0 */ | |
3403 | ||
3404 | /* Return nonzero if REF is an lvalue valid for this language. | |
3405 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
1394aabd | 3406 | Lvalues can have their address taken, unless they have DECL_REGISTER. */ |
400fbf9f JW |
3407 | |
3408 | int | |
3409 | lvalue_p (ref) | |
3410 | tree ref; | |
3411 | { | |
3412 | register enum tree_code code = TREE_CODE (ref); | |
3413 | ||
3414 | switch (code) | |
3415 | { | |
b6a10c9f RS |
3416 | case REALPART_EXPR: |
3417 | case IMAGPART_EXPR: | |
400fbf9f JW |
3418 | case COMPONENT_REF: |
3419 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
3420 | ||
3421 | case STRING_CST: | |
3422 | return 1; | |
3423 | ||
3424 | case INDIRECT_REF: | |
3425 | case ARRAY_REF: | |
3426 | case VAR_DECL: | |
3427 | case PARM_DECL: | |
3428 | case RESULT_DECL: | |
3429 | case ERROR_MARK: | |
3430 | if (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE | |
3431 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE) | |
3432 | return 1; | |
3433 | break; | |
3434 | } | |
3435 | return 0; | |
3436 | } | |
3437 | ||
3438 | /* Return nonzero if REF is an lvalue valid for this language; | |
3439 | otherwise, print an error message and return zero. */ | |
3440 | ||
3441 | int | |
3442 | lvalue_or_else (ref, string) | |
3443 | tree ref; | |
3444 | char *string; | |
3445 | { | |
3446 | int win = lvalue_p (ref); | |
3447 | if (! win) | |
3448 | error ("invalid lvalue in %s", string); | |
3449 | return win; | |
3450 | } | |
3451 | ||
3452 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
3453 | for certain kinds of expressions which are not really lvalues | |
3454 | but which we can accept as lvalues. | |
3455 | ||
3456 | If ARG is not a kind of expression we can handle, return zero. */ | |
3457 | ||
3458 | static tree | |
3459 | unary_complex_lvalue (code, arg) | |
3460 | enum tree_code code; | |
3461 | tree arg; | |
3462 | { | |
3463 | /* Handle (a, b) used as an "lvalue". */ | |
3464 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
3465 | { | |
3466 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
3467 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
3468 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), | |
3469 | TREE_OPERAND (arg, 0), real_result); | |
3470 | } | |
3471 | ||
3472 | /* Handle (a ? b : c) used as an "lvalue". */ | |
3473 | if (TREE_CODE (arg) == COND_EXPR) | |
3474 | { | |
3475 | pedantic_lvalue_warning (COND_EXPR); | |
3476 | return (build_conditional_expr | |
3477 | (TREE_OPERAND (arg, 0), | |
3478 | build_unary_op (code, TREE_OPERAND (arg, 1), 0), | |
3479 | build_unary_op (code, TREE_OPERAND (arg, 2), 0))); | |
3480 | } | |
3481 | ||
3482 | return 0; | |
3483 | } | |
3484 | ||
3485 | /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR | |
3486 | COMPOUND_EXPR, or CONVERT_EXPR (for casts). */ | |
3487 | ||
3488 | static void | |
3489 | pedantic_lvalue_warning (code) | |
3490 | enum tree_code code; | |
3491 | { | |
3492 | if (pedantic) | |
3493 | pedwarn ("ANSI C forbids use of %s expressions as lvalues", | |
3494 | code == COND_EXPR ? "conditional" | |
3495 | : code == COMPOUND_EXPR ? "compound" : "cast"); | |
3496 | } | |
3497 | \f | |
3498 | /* Warn about storing in something that is `const'. */ | |
3499 | ||
3500 | void | |
3501 | readonly_warning (arg, string) | |
3502 | tree arg; | |
3503 | char *string; | |
3504 | { | |
3505 | char buf[80]; | |
3506 | strcpy (buf, string); | |
3507 | ||
3791970d | 3508 | /* Forbid assignments to iterators. */ |
550707f7 | 3509 | if (TREE_CODE (arg) == VAR_DECL && ITERATOR_P (arg)) |
3791970d RS |
3510 | { |
3511 | strcat (buf, " of iterator `%s'"); | |
550707f7 | 3512 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg))); |
3791970d RS |
3513 | } |
3514 | ||
400fbf9f JW |
3515 | if (TREE_CODE (arg) == COMPONENT_REF) |
3516 | { | |
3517 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
3518 | readonly_warning (TREE_OPERAND (arg, 0), string); | |
3519 | else | |
3520 | { | |
3521 | strcat (buf, " of read-only member `%s'"); | |
3522 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1)))); | |
3523 | } | |
3524 | } | |
3525 | else if (TREE_CODE (arg) == VAR_DECL) | |
3526 | { | |
3527 | strcat (buf, " of read-only variable `%s'"); | |
3528 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3529 | } | |
3530 | else | |
3531 | { | |
3532 | pedwarn ("%s of read-only location", buf); | |
3533 | } | |
3534 | } | |
3535 | \f | |
3536 | /* Mark EXP saying that we need to be able to take the | |
3537 | address of it; it should not be allocated in a register. | |
3538 | Value is 1 if successful. */ | |
3539 | ||
3540 | int | |
3541 | mark_addressable (exp) | |
3542 | tree exp; | |
3543 | { | |
3544 | register tree x = exp; | |
3545 | while (1) | |
3546 | switch (TREE_CODE (x)) | |
3547 | { | |
3548 | case ADDR_EXPR: | |
3549 | case COMPONENT_REF: | |
3550 | case ARRAY_REF: | |
3551 | x = TREE_OPERAND (x, 0); | |
3552 | break; | |
3553 | ||
3554 | case CONSTRUCTOR: | |
3555 | TREE_ADDRESSABLE (x) = 1; | |
3556 | return 1; | |
3557 | ||
3558 | case VAR_DECL: | |
3559 | case CONST_DECL: | |
3560 | case PARM_DECL: | |
3561 | case RESULT_DECL: | |
1394aabd RS |
3562 | if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
3563 | && DECL_NONLOCAL (x)) | |
4bb6d2f8 RS |
3564 | { |
3565 | if (TREE_PUBLIC (x)) | |
3566 | { | |
3567 | error ("global register variable `%s' used in nested function", | |
3568 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3569 | return 0; | |
3570 | } | |
3571 | pedwarn ("register variable `%s' used in nested function", | |
3572 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3573 | } | |
1394aabd | 3574 | else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)) |
400fbf9f JW |
3575 | { |
3576 | if (TREE_PUBLIC (x)) | |
3577 | { | |
3578 | error ("address of global register variable `%s' requested", | |
3579 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3580 | return 0; | |
3581 | } | |
3582 | pedwarn ("address of register variable `%s' requested", | |
3583 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3584 | } | |
3585 | put_var_into_stack (x); | |
3586 | ||
3587 | /* drops in */ | |
3588 | case FUNCTION_DECL: | |
3589 | TREE_ADDRESSABLE (x) = 1; | |
3590 | #if 0 /* poplevel deals with this now. */ | |
3591 | if (DECL_CONTEXT (x) == 0) | |
3592 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
3593 | #endif | |
3594 | ||
3595 | default: | |
3596 | return 1; | |
3597 | } | |
3598 | } | |
3599 | \f | |
3600 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
3601 | ||
3602 | tree | |
3603 | build_conditional_expr (ifexp, op1, op2) | |
3604 | tree ifexp, op1, op2; | |
3605 | { | |
3606 | register tree type1; | |
3607 | register tree type2; | |
3608 | register enum tree_code code1; | |
3609 | register enum tree_code code2; | |
3610 | register tree result_type = NULL; | |
3611 | ||
3612 | /* If second operand is omitted, it is the same as the first one; | |
3613 | make sure it is calculated only once. */ | |
3614 | if (op1 == 0) | |
3615 | { | |
3616 | if (pedantic) | |
3617 | pedwarn ("ANSI C forbids omitting the middle term of a ?: expression"); | |
3618 | ifexp = op1 = save_expr (ifexp); | |
3619 | } | |
3620 | ||
3621 | ifexp = truthvalue_conversion (default_conversion (ifexp)); | |
3622 | ||
400fbf9f JW |
3623 | #if 0 /* Produces wrong result if within sizeof. */ |
3624 | /* Don't promote the operands separately if they promote | |
3625 | the same way. Return the unpromoted type and let the combined | |
3626 | value get promoted if necessary. */ | |
3627 | ||
3628 | if (TREE_TYPE (op1) == TREE_TYPE (op2) | |
3629 | && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE | |
3630 | && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE | |
3631 | && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE) | |
3632 | { | |
3633 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
a29f2ec1 | 3634 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f JW |
3635 | |
3636 | return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2)); | |
3637 | } | |
3638 | #endif | |
3639 | ||
e855c5ce | 3640 | /* Promote both alternatives. */ |
400fbf9f JW |
3641 | |
3642 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
3643 | op1 = default_conversion (op1); | |
3644 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
3645 | op2 = default_conversion (op2); | |
3646 | ||
e855c5ce RS |
3647 | if (TREE_CODE (ifexp) == ERROR_MARK |
3648 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
3649 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
3650 | return error_mark_node; | |
3651 | ||
400fbf9f JW |
3652 | type1 = TREE_TYPE (op1); |
3653 | code1 = TREE_CODE (type1); | |
3654 | type2 = TREE_TYPE (op2); | |
3655 | code2 = TREE_CODE (type2); | |
3656 | ||
3657 | /* Quickly detect the usual case where op1 and op2 have the same type | |
3658 | after promotion. */ | |
1ad409d2 RS |
3659 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
3660 | { | |
3661 | if (type1 == type2) | |
3662 | result_type = type1; | |
3663 | else | |
3664 | result_type = TYPE_MAIN_VARIANT (type1); | |
3665 | } | |
400fbf9f JW |
3666 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) |
3667 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
3668 | { | |
3669 | result_type = common_type (type1, type2); | |
3670 | } | |
3671 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3672 | { | |
3673 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
3674 | pedwarn ("ANSI C forbids conditional expr with only one void side"); | |
3675 | result_type = void_type_node; | |
3676 | } | |
3677 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3678 | { | |
3679 | if (comp_target_types (type1, type2)) | |
3680 | result_type = common_type (type1, type2); | |
3681 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node) | |
3682 | result_type = qualify_type (type2, type1); | |
3683 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node) | |
3684 | result_type = qualify_type (type1, type2); | |
3685 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) | |
3686 | { | |
3687 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) | |
3688 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3689 | result_type = qualify_type (type1, type2); | |
3690 | } | |
3691 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
3692 | { | |
3693 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) | |
3694 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3695 | result_type = qualify_type (type2, type1); | |
3696 | } | |
3697 | else | |
3698 | { | |
3699 | pedwarn ("pointer type mismatch in conditional expression"); | |
3700 | result_type = build_pointer_type (void_type_node); | |
3701 | } | |
3702 | } | |
3703 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3704 | { | |
3705 | if (! integer_zerop (op2)) | |
3706 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3707 | else | |
3708 | { | |
3709 | op2 = null_pointer_node; | |
3710 | #if 0 /* The spec seems to say this is permitted. */ | |
3711 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
3712 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3713 | #endif | |
3714 | } | |
3715 | result_type = type1; | |
3716 | } | |
3717 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3718 | { | |
3719 | if (!integer_zerop (op1)) | |
3720 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3721 | else | |
3722 | { | |
3723 | op1 = null_pointer_node; | |
3724 | #if 0 /* The spec seems to say this is permitted. */ | |
3725 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
3726 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3727 | #endif | |
3728 | } | |
3729 | result_type = type2; | |
3730 | } | |
3731 | ||
3732 | if (!result_type) | |
3733 | { | |
3734 | if (flag_cond_mismatch) | |
3735 | result_type = void_type_node; | |
3736 | else | |
3737 | { | |
3738 | error ("type mismatch in conditional expression"); | |
3739 | return error_mark_node; | |
3740 | } | |
3741 | } | |
3742 | ||
1dfdf85d RS |
3743 | /* Merge const and volatile flags of the incoming types. */ |
3744 | result_type | |
3745 | = build_type_variant (result_type, | |
48c73063 RS |
3746 | TREE_READONLY (op1) || TREE_READONLY (op2), |
3747 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
e58cd767 | 3748 | |
400fbf9f | 3749 | if (result_type != TREE_TYPE (op1)) |
e58cd767 | 3750 | op1 = convert_and_check (result_type, op1); |
400fbf9f | 3751 | if (result_type != TREE_TYPE (op2)) |
e58cd767 | 3752 | op2 = convert_and_check (result_type, op2); |
400fbf9f JW |
3753 | |
3754 | #if 0 | |
3755 | if (code1 == RECORD_TYPE || code1 == UNION_TYPE) | |
3756 | { | |
3757 | result_type = TREE_TYPE (op1); | |
3758 | if (TREE_CONSTANT (ifexp)) | |
a29f2ec1 | 3759 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f JW |
3760 | |
3761 | if (TYPE_MODE (result_type) == BLKmode) | |
3762 | { | |
3763 | register tree tempvar | |
3764 | = build_decl (VAR_DECL, NULL_TREE, result_type); | |
3765 | register tree xop1 = build_modify_expr (tempvar, op1); | |
3766 | register tree xop2 = build_modify_expr (tempvar, op2); | |
3767 | register tree result = fold (build (COND_EXPR, result_type, | |
3768 | ifexp, xop1, xop2)); | |
3769 | ||
3770 | layout_decl (tempvar, TYPE_ALIGN (result_type)); | |
3771 | /* No way to handle variable-sized objects here. | |
3772 | I fear that the entire handling of BLKmode conditional exprs | |
3773 | needs to be redone. */ | |
3774 | if (TREE_CODE (DECL_SIZE (tempvar)) != INTEGER_CST) | |
3775 | abort (); | |
3776 | DECL_RTL (tempvar) | |
3777 | = assign_stack_local (DECL_MODE (tempvar), | |
3778 | (TREE_INT_CST_LOW (DECL_SIZE (tempvar)) | |
3779 | + BITS_PER_UNIT - 1) | |
3780 | / BITS_PER_UNIT, | |
3781 | 0); | |
3782 | ||
3783 | TREE_SIDE_EFFECTS (result) | |
3784 | = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1) | |
3785 | | TREE_SIDE_EFFECTS (op2); | |
3786 | return build (COMPOUND_EXPR, result_type, result, tempvar); | |
3787 | } | |
3788 | } | |
3789 | #endif /* 0 */ | |
5abb45f2 RS |
3790 | |
3791 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
a29f2ec1 | 3792 | return pedantic_non_lvalue (integer_zerop (ifexp) ? op2 : op1); |
400fbf9f | 3793 | |
400fbf9f JW |
3794 | return fold (build (COND_EXPR, result_type, ifexp, op1, op2)); |
3795 | } | |
3796 | \f | |
3797 | /* Given a list of expressions, return a compound expression | |
3798 | that performs them all and returns the value of the last of them. */ | |
3799 | ||
3800 | tree | |
3801 | build_compound_expr (list) | |
3802 | tree list; | |
82bde854 | 3803 | { |
43a5a542 | 3804 | return internal_build_compound_expr (list, TRUE); |
82bde854 MM |
3805 | } |
3806 | ||
3807 | static tree | |
3808 | internal_build_compound_expr (list, first_p) | |
3809 | tree list; | |
3810 | int first_p; | |
400fbf9f JW |
3811 | { |
3812 | register tree rest; | |
3813 | ||
3814 | if (TREE_CHAIN (list) == 0) | |
3815 | { | |
6dc42e49 | 3816 | #if 0 /* If something inside inhibited lvalueness, we should not override. */ |
400fbf9f JW |
3817 | /* Consider (x, y+0), which is not an lvalue since y+0 is not. */ |
3818 | ||
3819 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3820 | if (TREE_CODE (list) == NON_LVALUE_EXPR) | |
3821 | list = TREE_OPERAND (list, 0); | |
3822 | #endif | |
3823 | ||
439f6027 | 3824 | /* Don't let (0, 0) be null pointer constant. */ |
82bde854 | 3825 | if (!first_p && integer_zerop (TREE_VALUE (list))) |
439f6027 RS |
3826 | return non_lvalue (TREE_VALUE (list)); |
3827 | return TREE_VALUE (list); | |
400fbf9f JW |
3828 | } |
3829 | ||
3830 | if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0) | |
3831 | { | |
3832 | /* Convert arrays to pointers when there really is a comma operator. */ | |
3833 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE) | |
3834 | TREE_VALUE (TREE_CHAIN (list)) | |
3835 | = default_conversion (TREE_VALUE (TREE_CHAIN (list))); | |
3836 | } | |
3837 | ||
82bde854 | 3838 | rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE); |
400fbf9f | 3839 | |
29df70e6 JW |
3840 | /* When pedantic, a compound expression can be neither an lvalue |
3841 | nor an integer constant expression. */ | |
3842 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) | |
400fbf9f JW |
3843 | return rest; |
3844 | ||
3845 | return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest); | |
3846 | } | |
3847 | ||
3848 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ | |
3849 | ||
3850 | tree | |
3851 | build_c_cast (type, expr) | |
3852 | register tree type; | |
3853 | tree expr; | |
3854 | { | |
3855 | register tree value = expr; | |
3856 | ||
3857 | if (type == error_mark_node || expr == error_mark_node) | |
3858 | return error_mark_node; | |
3859 | type = TYPE_MAIN_VARIANT (type); | |
3860 | ||
3861 | #if 0 | |
3862 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3863 | if (TREE_CODE (value) == NON_LVALUE_EXPR) | |
3864 | value = TREE_OPERAND (value, 0); | |
3865 | #endif | |
3866 | ||
3867 | if (TREE_CODE (type) == ARRAY_TYPE) | |
3868 | { | |
3869 | error ("cast specifies array type"); | |
3870 | return error_mark_node; | |
3871 | } | |
3872 | ||
3873 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
3874 | { | |
3875 | error ("cast specifies function type"); | |
3876 | return error_mark_node; | |
3877 | } | |
3878 | ||
3879 | if (type == TREE_TYPE (value)) | |
3880 | { | |
3881 | if (pedantic) | |
3882 | { | |
3883 | if (TREE_CODE (type) == RECORD_TYPE | |
3884 | || TREE_CODE (type) == UNION_TYPE) | |
3885 | pedwarn ("ANSI C forbids casting nonscalar to the same type"); | |
3886 | } | |
3887 | } | |
3888 | else if (TREE_CODE (type) == UNION_TYPE) | |
3889 | { | |
3890 | tree field; | |
0c16ddf7 RS |
3891 | if (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE |
3892 | || TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE) | |
3893 | value = default_conversion (value); | |
3894 | ||
400fbf9f JW |
3895 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
3896 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
3897 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
3898 | break; | |
3899 | ||
3900 | if (field) | |
3901 | { | |
805f961c RS |
3902 | char *name; |
3903 | tree nvalue; | |
3904 | ||
400fbf9f JW |
3905 | if (pedantic) |
3906 | pedwarn ("ANSI C forbids casts to union type"); | |
805f961c RS |
3907 | if (TYPE_NAME (type) != 0) |
3908 | { | |
3909 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
3910 | name = IDENTIFIER_POINTER (TYPE_NAME (type)); | |
3911 | else | |
3912 | name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
3913 | } | |
3914 | else | |
3915 | name = ""; | |
3916 | return digest_init (type, build_nt (CONSTRUCTOR, NULL_TREE, | |
3917 | build_tree_list (field, value)), | |
790e9490 | 3918 | 0, 0); |
400fbf9f JW |
3919 | } |
3920 | error ("cast to union type from type not present in union"); | |
3921 | return error_mark_node; | |
3922 | } | |
3923 | else | |
3924 | { | |
10d5caec | 3925 | tree otype, ovalue; |
53b01f59 RS |
3926 | |
3927 | /* If casting to void, avoid the error that would come | |
3928 | from default_conversion in the case of a non-lvalue array. */ | |
3929 | if (type == void_type_node) | |
3930 | return build1 (CONVERT_EXPR, type, value); | |
3931 | ||
400fbf9f JW |
3932 | /* Convert functions and arrays to pointers, |
3933 | but don't convert any other types. */ | |
3934 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
3935 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE) | |
3936 | value = default_conversion (value); | |
3937 | otype = TREE_TYPE (value); | |
3938 | ||
d45cf215 | 3939 | /* Optionally warn about potentially worrisome casts. */ |
400fbf9f JW |
3940 | |
3941 | if (warn_cast_qual | |
3942 | && TREE_CODE (type) == POINTER_TYPE | |
3943 | && TREE_CODE (otype) == POINTER_TYPE) | |
3944 | { | |
3945 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
3946 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
3947 | pedwarn ("cast discards `volatile' from pointer target type"); | |
3948 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
3949 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
3950 | pedwarn ("cast discards `const' from pointer target type"); | |
3951 | } | |
3952 | ||
3953 | /* Warn about possible alignment problems. */ | |
d45cf215 | 3954 | if (STRICT_ALIGNMENT && warn_cast_align |
400fbf9f JW |
3955 | && TREE_CODE (type) == POINTER_TYPE |
3956 | && TREE_CODE (otype) == POINTER_TYPE | |
3957 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3958 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
3959 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
3960 | warning ("cast increases required alignment of target type"); | |
400fbf9f JW |
3961 | |
3962 | if (TREE_CODE (type) == INTEGER_TYPE | |
3963 | && TREE_CODE (otype) == POINTER_TYPE | |
c9b7f31c RS |
3964 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
3965 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3966 | warning ("cast from pointer to integer of different size"); |
3967 | ||
3968 | if (TREE_CODE (type) == POINTER_TYPE | |
3969 | && TREE_CODE (otype) == INTEGER_TYPE | |
2918ed3c | 3970 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
c9b7f31c | 3971 | #if 0 |
2918ed3c RS |
3972 | /* Don't warn about converting 0 to pointer, |
3973 | provided the 0 was explicit--not cast or made by folding. */ | |
c9b7f31c RS |
3974 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value)) |
3975 | #endif | |
3976 | /* Don't warn about converting any constant. */ | |
3977 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3978 | warning ("cast to pointer from integer of different size"); |
3979 | ||
10d5caec | 3980 | ovalue = value; |
400fbf9f | 3981 | value = convert (type, value); |
e58cd767 RS |
3982 | |
3983 | /* Ignore any integer overflow caused by the cast. */ | |
3984 | if (TREE_CODE (value) == INTEGER_CST) | |
10d5caec PE |
3985 | { |
3986 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
3987 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
3988 | } | |
400fbf9f JW |
3989 | } |
3990 | ||
3991 | if (value == expr && pedantic) | |
3992 | { | |
3993 | /* If pedantic, don't let a cast be an lvalue. */ | |
3994 | return non_lvalue (value); | |
3995 | } | |
3996 | return value; | |
3997 | } | |
3998 | \f | |
3999 | /* Build an assignment expression of lvalue LHS from value RHS. | |
4000 | MODIFYCODE is the code for a binary operator that we use | |
4001 | to combine the old value of LHS with RHS to get the new value. | |
4002 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
4003 | ||
4004 | tree | |
4005 | build_modify_expr (lhs, modifycode, rhs) | |
4006 | tree lhs, rhs; | |
4007 | enum tree_code modifycode; | |
4008 | { | |
4009 | register tree result; | |
4010 | tree newrhs; | |
4011 | tree lhstype = TREE_TYPE (lhs); | |
4012 | tree olhstype = lhstype; | |
4013 | ||
4014 | /* Types that aren't fully specified cannot be used in assignments. */ | |
4015 | lhs = require_complete_type (lhs); | |
4016 | ||
4017 | /* Avoid duplicate error messages from operands that had errors. */ | |
4018 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
4019 | return error_mark_node; | |
4020 | ||
4021 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4022 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4023 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
4024 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
4025 | rhs = TREE_OPERAND (rhs, 0); | |
4026 | ||
4027 | newrhs = rhs; | |
4028 | ||
4029 | /* Handle control structure constructs used as "lvalues". */ | |
4030 | ||
4031 | switch (TREE_CODE (lhs)) | |
4032 | { | |
4033 | /* Handle (a, b) used as an "lvalue". */ | |
4034 | case COMPOUND_EXPR: | |
4035 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
4036 | return build (COMPOUND_EXPR, lhstype, | |
4037 | TREE_OPERAND (lhs, 0), | |
4038 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
4039 | modifycode, rhs)); | |
4040 | ||
4041 | /* Handle (a ? b : c) used as an "lvalue". */ | |
4042 | case COND_EXPR: | |
4043 | pedantic_lvalue_warning (COND_EXPR); | |
4044 | rhs = save_expr (rhs); | |
4045 | { | |
4046 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
4047 | except that the RHS goes through a save-expr | |
4048 | so the code to compute it is only emitted once. */ | |
4049 | tree cond | |
4050 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
4051 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
4052 | modifycode, rhs), | |
4053 | build_modify_expr (TREE_OPERAND (lhs, 2), | |
4054 | modifycode, rhs)); | |
4055 | /* Make sure the code to compute the rhs comes out | |
4056 | before the split. */ | |
4057 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
4058 | /* But cast it to void to avoid an "unused" error. */ | |
4059 | convert (void_type_node, rhs), cond); | |
4060 | } | |
4061 | } | |
4062 | ||
4063 | /* If a binary op has been requested, combine the old LHS value with the RHS | |
4064 | producing the value we should actually store into the LHS. */ | |
4065 | ||
4066 | if (modifycode != NOP_EXPR) | |
4067 | { | |
4068 | lhs = stabilize_reference (lhs); | |
4069 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
4070 | } | |
4071 | ||
4072 | /* Handle a cast used as an "lvalue". | |
4073 | We have already performed any binary operator using the value as cast. | |
4074 | Now convert the result to the cast type of the lhs, | |
4075 | and then true type of the lhs and store it there; | |
4076 | then convert result back to the cast type to be the value | |
4077 | of the assignment. */ | |
4078 | ||
4079 | switch (TREE_CODE (lhs)) | |
4080 | { | |
4081 | case NOP_EXPR: | |
4082 | case CONVERT_EXPR: | |
4083 | case FLOAT_EXPR: | |
4084 | case FIX_TRUNC_EXPR: | |
4085 | case FIX_FLOOR_EXPR: | |
4086 | case FIX_ROUND_EXPR: | |
4087 | case FIX_CEIL_EXPR: | |
4088 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
4089 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE) | |
4090 | newrhs = default_conversion (newrhs); | |
4091 | { | |
4092 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
4093 | tree result; | |
4094 | result = build_modify_expr (inner_lhs, NOP_EXPR, | |
4095 | convert (TREE_TYPE (inner_lhs), | |
4096 | convert (lhstype, newrhs))); | |
4097 | pedantic_lvalue_warning (CONVERT_EXPR); | |
4098 | return convert (TREE_TYPE (lhs), result); | |
4099 | } | |
4100 | } | |
4101 | ||
4102 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
4103 | Reject anything strange now. */ | |
4104 | ||
4105 | if (!lvalue_or_else (lhs, "assignment")) | |
4106 | return error_mark_node; | |
4107 | ||
4108 | /* Warn about storing in something that is `const'. */ | |
4109 | ||
4110 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
4111 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
4112 | || TREE_CODE (lhstype) == UNION_TYPE) | |
4113 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
4114 | readonly_warning (lhs, "assignment"); | |
4115 | ||
4116 | /* If storing into a structure or union member, | |
4117 | it has probably been given type `int'. | |
4118 | Compute the type that would go with | |
4119 | the actual amount of storage the member occupies. */ | |
4120 | ||
4121 | if (TREE_CODE (lhs) == COMPONENT_REF | |
4122 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
4123 | || TREE_CODE (lhstype) == REAL_TYPE | |
4124 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
4125 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
4126 | ||
4127 | /* If storing in a field that is in actuality a short or narrower than one, | |
4128 | we must store in the field in its actual type. */ | |
4129 | ||
4130 | if (lhstype != TREE_TYPE (lhs)) | |
4131 | { | |
4132 | lhs = copy_node (lhs); | |
4133 | TREE_TYPE (lhs) = lhstype; | |
4134 | } | |
4135 | ||
4136 | /* Convert new value to destination type. */ | |
4137 | ||
4138 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
9b7267b8 | 4139 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
4140 | if (TREE_CODE (newrhs) == ERROR_MARK) |
4141 | return error_mark_node; | |
4142 | ||
4143 | result = build (MODIFY_EXPR, lhstype, lhs, newrhs); | |
4144 | TREE_SIDE_EFFECTS (result) = 1; | |
4145 | ||
4146 | /* If we got the LHS in a different type for storing in, | |
4147 | convert the result back to the nominal type of LHS | |
4148 | so that the value we return always has the same type | |
4149 | as the LHS argument. */ | |
4150 | ||
4151 | if (olhstype == TREE_TYPE (result)) | |
4152 | return result; | |
9b7267b8 RS |
4153 | return convert_for_assignment (olhstype, result, "assignment", |
4154 | NULL_TREE, NULL_TREE, 0); | |
400fbf9f JW |
4155 | } |
4156 | \f | |
4157 | /* Convert value RHS to type TYPE as preparation for an assignment | |
4158 | to an lvalue of type TYPE. | |
4159 | The real work of conversion is done by `convert'. | |
4160 | The purpose of this function is to generate error messages | |
4161 | for assignments that are not allowed in C. | |
4162 | ERRTYPE is a string to use in error messages: | |
4163 | "assignment", "return", etc. If it is null, this is parameter passing | |
d45cf215 RS |
4164 | for a function call (and different error messages are output). Otherwise, |
4165 | it may be a name stored in the spelling stack and interpreted by | |
4166 | get_spelling. | |
400fbf9f JW |
4167 | |
4168 | FUNNAME is the name of the function being called, | |
4169 | as an IDENTIFIER_NODE, or null. | |
4170 | PARMNUM is the number of the argument, for printing in error messages. */ | |
4171 | ||
4172 | static tree | |
9b7267b8 | 4173 | convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum) |
400fbf9f JW |
4174 | tree type, rhs; |
4175 | char *errtype; | |
9b7267b8 | 4176 | tree fundecl, funname; |
400fbf9f JW |
4177 | int parmnum; |
4178 | { | |
4179 | register enum tree_code codel = TREE_CODE (type); | |
4180 | register tree rhstype; | |
4181 | register enum tree_code coder; | |
4182 | ||
4183 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4184 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4185 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
4186 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
4187 | rhs = TREE_OPERAND (rhs, 0); | |
4188 | ||
4189 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
4190 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE) | |
4191 | rhs = default_conversion (rhs); | |
4192 | ||
4193 | rhstype = TREE_TYPE (rhs); | |
4194 | coder = TREE_CODE (rhstype); | |
4195 | ||
4196 | if (coder == ERROR_MARK) | |
4197 | return error_mark_node; | |
4198 | ||
4199 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
e58cd767 RS |
4200 | { |
4201 | overflow_warning (rhs); | |
8b40563c TW |
4202 | /* Check for Objective-C protocols. This will issue a warning if |
4203 | there are protocol violations. No need to use the return value. */ | |
4204 | maybe_objc_comptypes (type, rhstype, 0); | |
e58cd767 RS |
4205 | return rhs; |
4206 | } | |
400fbf9f JW |
4207 | |
4208 | if (coder == VOID_TYPE) | |
4209 | { | |
4210 | error ("void value not ignored as it ought to be"); | |
4211 | return error_mark_node; | |
4212 | } | |
4213 | /* Arithmetic types all interconvert, and enum is treated like int. */ | |
b6a10c9f RS |
4214 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == ENUMERAL_TYPE |
4215 | || codel == COMPLEX_TYPE) | |
400fbf9f | 4216 | && |
b6a10c9f RS |
4217 | (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == ENUMERAL_TYPE |
4218 | || codel == COMPLEX_TYPE)) | |
da3c6115 | 4219 | return convert_and_check (type, rhs); |
9b7267b8 | 4220 | /* Conversion to a union from its member types. */ |
db9e5545 | 4221 | else if (codel == UNION_TYPE) |
9b7267b8 RS |
4222 | { |
4223 | tree memb_types; | |
4224 | for (memb_types = TYPE_FIELDS (type); memb_types; | |
4225 | memb_types = TREE_CHAIN (memb_types)) | |
4226 | { | |
4227 | if (comptypes (TREE_TYPE (memb_types), TREE_TYPE (rhs))) | |
4228 | { | |
4229 | if (pedantic | |
4230 | && !(fundecl != 0 && DECL_IN_SYSTEM_HEADER (fundecl))) | |
4231 | pedwarn ("ANSI C prohibits argument conversion to union type"); | |
4232 | return build1 (NOP_EXPR, type, rhs); | |
4233 | } | |
2df34974 RS |
4234 | else if (coder == POINTER_TYPE |
4235 | && TREE_CODE (TREE_TYPE (memb_types)) == POINTER_TYPE) | |
4236 | { | |
4237 | tree memb_type = TREE_TYPE (memb_types); | |
4238 | register tree ttl = TREE_TYPE (memb_type); | |
4239 | register tree ttr = TREE_TYPE (rhstype); | |
4240 | ||
4241 | /* Any non-function converts to a [const][volatile] void * | |
4242 | and vice versa; otherwise, targets must be the same. | |
4243 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
4244 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4245 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4246 | || comp_target_types (memb_type, rhstype)) | |
4247 | { | |
4248 | /* Const and volatile mean something different for function types, | |
4249 | so the usual warnings are not appropriate. */ | |
4250 | if (TREE_CODE (ttr) != FUNCTION_TYPE | |
4251 | || TREE_CODE (ttl) != FUNCTION_TYPE) | |
4252 | { | |
4253 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
4254 | warn_for_assignment ("%s discards `const' from pointer target type", | |
4255 | get_spelling (errtype), funname, parmnum); | |
4256 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) | |
4257 | warn_for_assignment ("%s discards `volatile' from pointer target type", | |
4258 | get_spelling (errtype), funname, parmnum); | |
4259 | } | |
4260 | else | |
4261 | { | |
4262 | /* Because const and volatile on functions are restrictions | |
4263 | that say the function will not do certain things, | |
4264 | it is okay to use a const or volatile function | |
4265 | where an ordinary one is wanted, but not vice-versa. */ | |
4266 | if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr)) | |
4267 | warn_for_assignment ("%s makes `const *' function pointer from non-const", | |
4268 | get_spelling (errtype), funname, parmnum); | |
4269 | if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr)) | |
4270 | warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile", | |
4271 | get_spelling (errtype), funname, parmnum); | |
4272 | } | |
4273 | if (pedantic | |
4274 | && !(fundecl != 0 && DECL_IN_SYSTEM_HEADER (fundecl))) | |
4275 | pedwarn ("ANSI C prohibits argument conversion to union type"); | |
4276 | return build1 (NOP_EXPR, type, rhs); | |
4277 | } | |
4278 | } | |
9b7267b8 RS |
4279 | } |
4280 | } | |
400fbf9f JW |
4281 | /* Conversions among pointers */ |
4282 | else if (codel == POINTER_TYPE && coder == POINTER_TYPE) | |
4283 | { | |
4284 | register tree ttl = TREE_TYPE (type); | |
4285 | register tree ttr = TREE_TYPE (rhstype); | |
4286 | ||
4287 | /* Any non-function converts to a [const][volatile] void * | |
4288 | and vice versa; otherwise, targets must be the same. | |
4289 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
4290 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4291 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
790e9490 RS |
4292 | || comp_target_types (type, rhstype) |
4293 | || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) | |
4294 | == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
400fbf9f JW |
4295 | { |
4296 | if (pedantic | |
4297 | && ((TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4298 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
4299 | || | |
4300 | (TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4301 | && !integer_zerop (rhs) | |
4302 | && TREE_CODE (ttl) == FUNCTION_TYPE))) | |
4303 | warn_for_assignment ("ANSI forbids %s between function pointer and `void *'", | |
d45cf215 | 4304 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4305 | /* Const and volatile mean something different for function types, |
4306 | so the usual warnings are not appropriate. */ | |
4307 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
4308 | || TREE_CODE (ttl) != FUNCTION_TYPE) | |
4309 | { | |
4310 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
4311 | warn_for_assignment ("%s discards `const' from pointer target type", | |
d45cf215 | 4312 | get_spelling (errtype), funname, parmnum); |
790e9490 | 4313 | else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
400fbf9f | 4314 | warn_for_assignment ("%s discards `volatile' from pointer target type", |
d45cf215 | 4315 | get_spelling (errtype), funname, parmnum); |
790e9490 RS |
4316 | /* If this is not a case of ignoring a mismatch in signedness, |
4317 | no warning. */ | |
4318 | else if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4319 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4320 | || comp_target_types (type, rhstype)) | |
4321 | ; | |
4322 | /* If there is a mismatch, do warn. */ | |
4323 | else if (pedantic) | |
4324 | warn_for_assignment ("pointer targets in %s differ in signedness", | |
4325 | get_spelling (errtype), funname, parmnum); | |
400fbf9f JW |
4326 | } |
4327 | else | |
4328 | { | |
4329 | /* Because const and volatile on functions are restrictions | |
4330 | that say the function will not do certain things, | |
4331 | it is okay to use a const or volatile function | |
4332 | where an ordinary one is wanted, but not vice-versa. */ | |
4333 | if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr)) | |
4334 | warn_for_assignment ("%s makes `const *' function pointer from non-const", | |
d45cf215 | 4335 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4336 | if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr)) |
4337 | warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile", | |
d45cf215 | 4338 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4339 | } |
4340 | } | |
400fbf9f JW |
4341 | else |
4342 | warn_for_assignment ("%s from incompatible pointer type", | |
d45cf215 | 4343 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4344 | return convert (type, rhs); |
4345 | } | |
4346 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
4347 | { | |
2918ed3c RS |
4348 | /* An explicit constant 0 can convert to a pointer, |
4349 | but not a 0 that results from casting or folding. */ | |
4350 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) | |
400fbf9f JW |
4351 | { |
4352 | warn_for_assignment ("%s makes pointer from integer without a cast", | |
d45cf215 | 4353 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4354 | return convert (type, rhs); |
4355 | } | |
4356 | return null_pointer_node; | |
4357 | } | |
4358 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) | |
4359 | { | |
4360 | warn_for_assignment ("%s makes integer from pointer without a cast", | |
d45cf215 | 4361 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4362 | return convert (type, rhs); |
4363 | } | |
4364 | ||
4365 | if (!errtype) | |
4366 | { | |
4367 | if (funname) | |
8b40563c TW |
4368 | { |
4369 | tree selector = maybe_building_objc_message_expr (); | |
4370 | ||
4371 | if (selector && parmnum > 2) | |
4372 | error ("incompatible type for argument %d of `%s'", | |
4373 | parmnum - 2, IDENTIFIER_POINTER (selector)); | |
4374 | else | |
4375 | error ("incompatible type for argument %d of `%s'", | |
4376 | parmnum, IDENTIFIER_POINTER (funname)); | |
4377 | } | |
400fbf9f JW |
4378 | else |
4379 | error ("incompatible type for argument %d of indirect function call", | |
4380 | parmnum); | |
4381 | } | |
4382 | else | |
d45cf215 | 4383 | error ("incompatible types in %s", get_spelling (errtype)); |
400fbf9f JW |
4384 | |
4385 | return error_mark_node; | |
4386 | } | |
4387 | ||
4388 | /* Print a warning using MSG. | |
4389 | It gets OPNAME as its one parameter. | |
4390 | If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'". | |
4391 | FUNCTION and ARGNUM are handled specially if we are building an | |
4392 | Objective-C selector. */ | |
4393 | ||
4394 | static void | |
4395 | warn_for_assignment (msg, opname, function, argnum) | |
4396 | char *msg; | |
4397 | char *opname; | |
4398 | tree function; | |
4399 | int argnum; | |
4400 | { | |
4401 | static char argstring[] = "passing arg %d of `%s'"; | |
4402 | static char argnofun[] = "passing arg %d"; | |
4403 | ||
4404 | if (opname == 0) | |
4405 | { | |
4406 | tree selector = maybe_building_objc_message_expr (); | |
4407 | ||
4408 | if (selector && argnum > 2) | |
4409 | { | |
4410 | function = selector; | |
4411 | argnum -= 2; | |
4412 | } | |
4413 | if (function) | |
4414 | { | |
4415 | /* Function name is known; supply it. */ | |
4416 | opname = (char *) alloca (IDENTIFIER_LENGTH (function) | |
4417 | + sizeof (argstring) + 25 /*%d*/ + 1); | |
4418 | sprintf (opname, argstring, argnum, IDENTIFIER_POINTER (function)); | |
4419 | } | |
4420 | else | |
4421 | { | |
4422 | /* Function name unknown (call through ptr); just give arg number. */ | |
4423 | opname = (char *) alloca (sizeof (argnofun) + 25 /*%d*/ + 1); | |
4424 | sprintf (opname, argnofun, argnum); | |
4425 | } | |
4426 | } | |
4427 | pedwarn (msg, opname); | |
4428 | } | |
4429 | \f | |
4430 | /* Return nonzero if VALUE is a valid constant-valued expression | |
4431 | for use in initializing a static variable; one that can be an | |
4432 | element of a "constant" initializer. | |
4433 | ||
4434 | Return null_pointer_node if the value is absolute; | |
4435 | if it is relocatable, return the variable that determines the relocation. | |
4436 | We assume that VALUE has been folded as much as possible; | |
4437 | therefore, we do not need to check for such things as | |
4438 | arithmetic-combinations of integers. */ | |
4439 | ||
4440 | static tree | |
f0c70ef0 | 4441 | initializer_constant_valid_p (value, endtype) |
400fbf9f | 4442 | tree value; |
f0c70ef0 | 4443 | tree endtype; |
400fbf9f JW |
4444 | { |
4445 | switch (TREE_CODE (value)) | |
4446 | { | |
4447 | case CONSTRUCTOR: | |
4448 | return TREE_STATIC (value) ? null_pointer_node : 0; | |
4449 | ||
4450 | case INTEGER_CST: | |
4451 | case REAL_CST: | |
4452 | case STRING_CST: | |
466e9220 | 4453 | case COMPLEX_CST: |
400fbf9f JW |
4454 | return null_pointer_node; |
4455 | ||
4456 | case ADDR_EXPR: | |
4457 | return TREE_OPERAND (value, 0); | |
4458 | ||
4459 | case NON_LVALUE_EXPR: | |
f0c70ef0 | 4460 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4461 | |
4462 | case CONVERT_EXPR: | |
4463 | case NOP_EXPR: | |
4464 | /* Allow conversions between pointer types. */ | |
4465 | if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE | |
4466 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE) | |
f0c70ef0 | 4467 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4468 | /* Allow conversions between real types. */ |
4469 | if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE | |
4470 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE) | |
f0c70ef0 | 4471 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4472 | /* Allow length-preserving conversions between integer types. */ |
4473 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE | |
4474 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE | |
4475 | && tree_int_cst_equal (TYPE_SIZE (TREE_TYPE (value)), | |
4476 | TYPE_SIZE (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 | 4477 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4478 | /* Allow conversions between integer types only if explicit value. */ |
4479 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE | |
4480 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE) | |
4481 | { | |
f0c70ef0 RS |
4482 | tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4483 | endtype); | |
400fbf9f JW |
4484 | if (inner == null_pointer_node) |
4485 | return null_pointer_node; | |
4486 | return 0; | |
4487 | } | |
9b7267b8 | 4488 | /* Allow (int) &foo provided int is as wide as a pointer. */ |
400fbf9f JW |
4489 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE |
4490 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE | |
9b7267b8 RS |
4491 | && ! tree_int_cst_lt (TYPE_SIZE (TREE_TYPE (value)), |
4492 | TYPE_SIZE (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 RS |
4493 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4494 | endtype); | |
805f961c RS |
4495 | /* Allow conversions to union types if the value inside is okay. */ |
4496 | if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE) | |
f0c70ef0 RS |
4497 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4498 | endtype); | |
400fbf9f JW |
4499 | return 0; |
4500 | ||
4501 | case PLUS_EXPR: | |
1bbe9280 RS |
4502 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4503 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4504 | return 0; |
400fbf9f | 4505 | { |
f0c70ef0 RS |
4506 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4507 | endtype); | |
4508 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4509 | endtype); | |
400fbf9f JW |
4510 | /* If either term is absolute, use the other terms relocation. */ |
4511 | if (valid0 == null_pointer_node) | |
4512 | return valid1; | |
4513 | if (valid1 == null_pointer_node) | |
4514 | return valid0; | |
4515 | return 0; | |
4516 | } | |
4517 | ||
4518 | case MINUS_EXPR: | |
1bbe9280 RS |
4519 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4520 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4521 | return 0; |
400fbf9f | 4522 | { |
f0c70ef0 RS |
4523 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4524 | endtype); | |
4525 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4526 | endtype); | |
400fbf9f JW |
4527 | /* Win if second argument is absolute. */ |
4528 | if (valid1 == null_pointer_node) | |
4529 | return valid0; | |
4530 | /* Win if both arguments have the same relocation. | |
4531 | Then the value is absolute. */ | |
4532 | if (valid0 == valid1) | |
4533 | return null_pointer_node; | |
4534 | return 0; | |
4535 | } | |
4536 | } | |
4537 | ||
4538 | return 0; | |
4539 | } | |
4540 | \f | |
4541 | /* Perform appropriate conversions on the initial value of a variable, | |
4542 | store it in the declaration DECL, | |
4543 | and print any error messages that are appropriate. | |
4544 | If the init is invalid, store an ERROR_MARK. */ | |
4545 | ||
4546 | void | |
4547 | store_init_value (decl, init) | |
4548 | tree decl, init; | |
4549 | { | |
4550 | register tree value, type; | |
4551 | ||
4552 | /* If variable's type was invalidly declared, just ignore it. */ | |
4553 | ||
4554 | type = TREE_TYPE (decl); | |
4555 | if (TREE_CODE (type) == ERROR_MARK) | |
4556 | return; | |
4557 | ||
4558 | /* Digest the specified initializer into an expression. */ | |
4559 | ||
790e9490 RS |
4560 | value = digest_init (type, init, TREE_STATIC (decl), |
4561 | TREE_STATIC (decl) || pedantic); | |
400fbf9f JW |
4562 | |
4563 | /* Store the expression if valid; else report error. */ | |
4564 | ||
4565 | #if 0 | |
4566 | /* Note that this is the only place we can detect the error | |
4567 | in a case such as struct foo bar = (struct foo) { x, y }; | |
d45cf215 | 4568 | where there is one initial value which is a constructor expression. */ |
400fbf9f JW |
4569 | if (value == error_mark_node) |
4570 | ; | |
4571 | else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value)) | |
4572 | { | |
4573 | error ("initializer for static variable is not constant"); | |
4574 | value = error_mark_node; | |
4575 | } | |
4576 | else if (TREE_STATIC (decl) | |
f0c70ef0 | 4577 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) |
400fbf9f JW |
4578 | { |
4579 | error ("initializer for static variable uses complicated arithmetic"); | |
4580 | value = error_mark_node; | |
4581 | } | |
4582 | else | |
4583 | { | |
4584 | if (pedantic && TREE_CODE (value) == CONSTRUCTOR) | |
4585 | { | |
4586 | if (! TREE_CONSTANT (value)) | |
4587 | pedwarn ("aggregate initializer is not constant"); | |
4588 | else if (! TREE_STATIC (value)) | |
4589 | pedwarn ("aggregate initializer uses complicated arithmetic"); | |
4590 | } | |
4591 | } | |
4592 | #endif | |
4593 | ||
10d5caec PE |
4594 | DECL_INITIAL (decl) = value; |
4595 | ||
26b3c423 | 4596 | /* ANSI wants warnings about out-of-range constant initializers. */ |
10d5caec | 4597 | STRIP_TYPE_NOPS (value); |
26b3c423 | 4598 | constant_expression_warning (value); |
400fbf9f JW |
4599 | } |
4600 | \f | |
075fc632 | 4601 | /* Methods for storing and printing names for error messages. */ |
d45cf215 RS |
4602 | |
4603 | /* Implement a spelling stack that allows components of a name to be pushed | |
4604 | and popped. Each element on the stack is this structure. */ | |
4605 | ||
4606 | struct spelling | |
4607 | { | |
4608 | int kind; | |
4609 | union | |
4610 | { | |
4611 | int i; | |
4612 | char *s; | |
4613 | } u; | |
4614 | }; | |
4615 | ||
4616 | #define SPELLING_STRING 1 | |
4617 | #define SPELLING_MEMBER 2 | |
4618 | #define SPELLING_BOUNDS 3 | |
4619 | ||
4620 | static struct spelling *spelling; /* Next stack element (unused). */ | |
4621 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4622 | static int spelling_size; /* Size of the spelling stack. */ | |
4623 | ||
4624 | /* Macros to save and restore the spelling stack around push_... functions. | |
4625 | Alternative to SAVE_SPELLING_STACK. */ | |
4626 | ||
4627 | #define SPELLING_DEPTH() (spelling - spelling_base) | |
4628 | #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth) | |
4629 | ||
4630 | /* Save and restore the spelling stack around arbitrary C code. */ | |
4631 | ||
4632 | #define SAVE_SPELLING_DEPTH(code) \ | |
4633 | { \ | |
4634 | int __depth = SPELLING_DEPTH (); \ | |
4635 | code; \ | |
4636 | RESTORE_SPELLING_DEPTH (__depth); \ | |
4637 | } | |
4638 | ||
4639 | /* Push an element on the spelling stack with type KIND and assign VALUE | |
4640 | to MEMBER. */ | |
4641 | ||
4642 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ | |
4643 | { \ | |
4644 | int depth = SPELLING_DEPTH (); \ | |
4645 | \ | |
4646 | if (depth >= spelling_size) \ | |
4647 | { \ | |
4648 | spelling_size += 10; \ | |
4649 | if (spelling_base == 0) \ | |
4650 | spelling_base \ | |
4651 | = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \ | |
4652 | else \ | |
4653 | spelling_base \ | |
4654 | = (struct spelling *) xrealloc (spelling_base, \ | |
4655 | spelling_size * sizeof (struct spelling)); \ | |
4656 | RESTORE_SPELLING_DEPTH (depth); \ | |
4657 | } \ | |
4658 | \ | |
4659 | spelling->kind = (KIND); \ | |
4660 | spelling->MEMBER = (VALUE); \ | |
4661 | spelling++; \ | |
4662 | } | |
4663 | ||
4664 | /* Push STRING on the stack. Printed literally. */ | |
4665 | ||
4666 | static void | |
4667 | push_string (string) | |
4668 | char *string; | |
4669 | { | |
4670 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4671 | } | |
4672 | ||
4673 | /* Push a member name on the stack. Printed as '.' STRING. */ | |
4674 | ||
4675 | static void | |
4676 | push_member_name (string) | |
4677 | char *string; | |
4678 | { | |
4679 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); | |
4680 | } | |
4681 | ||
4682 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ | |
4683 | ||
4684 | static void | |
4685 | push_array_bounds (bounds) | |
4686 | int bounds; | |
4687 | { | |
4688 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4689 | } | |
4690 | ||
4691 | /* Compute the maximum size in bytes of the printed spelling. */ | |
4692 | ||
4693 | static int | |
4694 | spelling_length () | |
4695 | { | |
4696 | register int size = 0; | |
4697 | register struct spelling *p; | |
4698 | ||
4699 | for (p = spelling_base; p < spelling; p++) | |
4700 | { | |
4701 | if (p->kind == SPELLING_BOUNDS) | |
4702 | size += 25; | |
4703 | else | |
4704 | size += strlen (p->u.s) + 1; | |
4705 | } | |
4706 | ||
4707 | return size; | |
4708 | } | |
4709 | ||
4710 | /* Print the spelling to BUFFER and return it. */ | |
4711 | ||
4712 | static char * | |
4713 | print_spelling (buffer) | |
4714 | register char *buffer; | |
4715 | { | |
4716 | register char *d = buffer; | |
4717 | register char *s; | |
4718 | register struct spelling *p; | |
4719 | ||
4720 | for (p = spelling_base; p < spelling; p++) | |
4721 | if (p->kind == SPELLING_BOUNDS) | |
4722 | { | |
4723 | sprintf (d, "[%d]", p->u.i); | |
4724 | d += strlen (d); | |
4725 | } | |
4726 | else | |
4727 | { | |
4728 | if (p->kind == SPELLING_MEMBER) | |
4729 | *d++ = '.'; | |
4730 | for (s = p->u.s; *d = *s++; d++) | |
4731 | ; | |
4732 | } | |
4733 | *d++ = '\0'; | |
4734 | return buffer; | |
4735 | } | |
4736 | ||
4737 | /* Provide a means to pass component names derived from the spelling stack. */ | |
4738 | ||
4739 | char initialization_message; | |
4740 | ||
4741 | /* Interpret the spelling of the given ERRTYPE message. */ | |
4742 | ||
4743 | static char * | |
4744 | get_spelling (errtype) | |
4745 | char *errtype; | |
4746 | { | |
4747 | static char *buffer; | |
4748 | static int size = -1; | |
4749 | ||
4750 | if (errtype == &initialization_message) | |
4751 | { | |
4752 | /* Avoid counting chars */ | |
4753 | static char message[] = "initialization of `%s'"; | |
4754 | register int needed = sizeof (message) + spelling_length () + 1; | |
047de90b | 4755 | char *temp; |
d45cf215 RS |
4756 | |
4757 | if (size < 0) | |
4758 | buffer = (char *) xmalloc (size = needed); | |
4759 | if (needed > size) | |
4760 | buffer = (char *) xrealloc (buffer, size = needed); | |
4761 | ||
047de90b RS |
4762 | temp = (char *) alloca (needed); |
4763 | sprintf (buffer, message, print_spelling (temp)); | |
d45cf215 RS |
4764 | return buffer; |
4765 | } | |
4766 | ||
4767 | return errtype; | |
4768 | } | |
4769 | ||
400fbf9f JW |
4770 | /* Issue an error message for a bad initializer component. |
4771 | FORMAT describes the message. OFWHAT is the name for the component. | |
4772 | LOCAL is a format string for formatting the insertion of the name | |
4773 | into the message. | |
4774 | ||
d45cf215 | 4775 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4776 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4777 | |
4778 | void | |
4779 | error_init (format, local, ofwhat) | |
4780 | char *format, *local, *ofwhat; | |
4781 | { | |
d45cf215 RS |
4782 | char *buffer; |
4783 | ||
4784 | if (ofwhat == 0) | |
73a424d3 | 4785 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
d45cf215 | 4786 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); |
400fbf9f JW |
4787 | |
4788 | if (*ofwhat) | |
4789 | sprintf (buffer, local, ofwhat); | |
4790 | else | |
4791 | buffer[0] = 0; | |
4792 | ||
4793 | error (format, buffer); | |
4794 | } | |
4795 | ||
4796 | /* Issue a pedantic warning for a bad initializer component. | |
4797 | FORMAT describes the message. OFWHAT is the name for the component. | |
4798 | LOCAL is a format string for formatting the insertion of the name | |
4799 | into the message. | |
4800 | ||
d45cf215 | 4801 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4802 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4803 | |
4804 | void | |
4805 | pedwarn_init (format, local, ofwhat) | |
4806 | char *format, *local, *ofwhat; | |
4807 | { | |
d45cf215 RS |
4808 | char *buffer; |
4809 | ||
4810 | if (ofwhat == 0) | |
73a424d3 | 4811 | ofwhat = print_spelling ((char *) alloca (spelling_length () + 1)); |
d45cf215 | 4812 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); |
400fbf9f JW |
4813 | |
4814 | if (*ofwhat) | |
4815 | sprintf (buffer, local, ofwhat); | |
4816 | else | |
4817 | buffer[0] = 0; | |
4818 | ||
4819 | pedwarn (format, buffer); | |
4820 | } | |
4821 | \f | |
4822 | /* Digest the parser output INIT as an initializer for type TYPE. | |
4823 | Return a C expression of type TYPE to represent the initial value. | |
4824 | ||
4825 | If TAIL is nonzero, it points to a variable holding a list of elements | |
4826 | of which INIT is the first. We update the list stored there by | |
4827 | removing from the head all the elements that we use. | |
4828 | Normally this is only one; we use more than one element only if | |
4829 | TYPE is an aggregate and INIT is not a constructor. | |
4830 | ||
4831 | The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors | |
4832 | if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT | |
4833 | applies only to elements of constructors. | |
4834 | ||
d45cf215 RS |
4835 | If OFWHAT is nonnull, it specifies what we are initializing, for error |
4836 | messages. Examples: variable name, variable.member, array[44]. | |
103b7b17 RS |
4837 | If OFWHAT is null, the component name is stored on the spelling stack. |
4838 | (That is true for all nested calls to digest_init.) */ | |
400fbf9f | 4839 | |
b62acd60 | 4840 | static tree |
790e9490 RS |
4841 | digest_init (type, init, require_constant, constructor_constant) |
4842 | tree type, init; | |
400fbf9f | 4843 | int require_constant, constructor_constant; |
400fbf9f JW |
4844 | { |
4845 | enum tree_code code = TREE_CODE (type); | |
4846 | tree element = 0; | |
047de90b | 4847 | tree inside_init = init; |
400fbf9f | 4848 | |
400fbf9f JW |
4849 | if (init == error_mark_node) |
4850 | return init; | |
4851 | ||
4852 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4853 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4854 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f | 4855 | if (TREE_CODE (init) == NON_LVALUE_EXPR) |
047de90b | 4856 | inside_init = TREE_OPERAND (init, 0); |
400fbf9f | 4857 | |
400fbf9f JW |
4858 | /* Initialization of an array of chars from a string constant |
4859 | optionally enclosed in braces. */ | |
4860 | ||
4861 | if (code == ARRAY_TYPE) | |
4862 | { | |
4863 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
4864 | if ((typ1 == char_type_node | |
4865 | || typ1 == signed_char_type_node | |
4866 | || typ1 == unsigned_char_type_node | |
4867 | || typ1 == unsigned_wchar_type_node | |
4868 | || typ1 == signed_wchar_type_node) | |
047de90b | 4869 | && ((inside_init && TREE_CODE (inside_init) == STRING_CST) |
400fbf9f JW |
4870 | || (element && TREE_CODE (element) == STRING_CST))) |
4871 | { | |
047de90b | 4872 | tree string = element ? element : inside_init; |
400fbf9f | 4873 | |
d11fdb45 RS |
4874 | if (TREE_TYPE (string) == type) |
4875 | return string; | |
4876 | ||
400fbf9f JW |
4877 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) |
4878 | != char_type_node) | |
4879 | && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node)) | |
4880 | { | |
4881 | error_init ("char-array%s initialized from wide string", | |
de520661 | 4882 | " `%s'", NULL); |
400fbf9f JW |
4883 | return error_mark_node; |
4884 | } | |
4885 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) | |
4886 | == char_type_node) | |
4887 | && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)) | |
4888 | { | |
4889 | error_init ("int-array%s initialized from non-wide string", | |
de520661 | 4890 | " `%s'", NULL); |
400fbf9f JW |
4891 | return error_mark_node; |
4892 | } | |
4893 | ||
4894 | TREE_TYPE (string) = type; | |
4895 | if (TYPE_DOMAIN (type) != 0 | |
4896 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
4897 | { | |
4898 | register int size = TREE_INT_CST_LOW (TYPE_SIZE (type)); | |
4899 | size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT; | |
fe9ef5d7 RS |
4900 | /* Subtract 1 (or sizeof (wchar_t)) |
4901 | because it's ok to ignore the terminating null char | |
400fbf9f | 4902 | that is counted in the length of the constant. */ |
fe9ef5d7 RS |
4903 | if (size < TREE_STRING_LENGTH (string) |
4904 | - (TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node) | |
4905 | ? TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT | |
4906 | : 1)) | |
400fbf9f JW |
4907 | pedwarn_init ( |
4908 | "initializer-string for array of chars%s is too long", | |
de520661 | 4909 | " `%s'", NULL); |
400fbf9f JW |
4910 | } |
4911 | return string; | |
4912 | } | |
4913 | } | |
4914 | ||
de520661 RS |
4915 | /* Any type can be initialized |
4916 | from an expression of the same type, optionally with braces. */ | |
400fbf9f | 4917 | |
2726966d RS |
4918 | if (inside_init && TREE_TYPE (inside_init) != 0 |
4919 | && ((TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)) | |
b39a6d43 | 4920 | == TYPE_MAIN_VARIANT (type)) |
2726966d | 4921 | || (code == ARRAY_TYPE |
3c3fa147 RS |
4922 | && comptypes (TREE_TYPE (inside_init), type)) |
4923 | || (code == POINTER_TYPE | |
3c3fa147 RS |
4924 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4925 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE) | |
4926 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), | |
4927 | TREE_TYPE (type))))) | |
400fbf9f JW |
4928 | { |
4929 | if (code == POINTER_TYPE | |
047de90b RS |
4930 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4931 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)) | |
4932 | inside_init = default_conversion (inside_init); | |
de520661 RS |
4933 | else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST |
4934 | && TREE_CODE (inside_init) != CONSTRUCTOR) | |
400fbf9f JW |
4935 | { |
4936 | error_init ("array%s initialized from non-constant array expression", | |
de520661 | 4937 | " `%s'", NULL); |
400fbf9f JW |
4938 | return error_mark_node; |
4939 | } | |
4940 | ||
047de90b RS |
4941 | if (optimize && TREE_READONLY (inside_init) |
4942 | && TREE_CODE (inside_init) == VAR_DECL) | |
4943 | inside_init = decl_constant_value (inside_init); | |
400fbf9f | 4944 | |
047de90b | 4945 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f JW |
4946 | { |
4947 | error_init ("initializer element%s is not constant", | |
de520661 | 4948 | " for `%s'", NULL); |
047de90b | 4949 | inside_init = error_mark_node; |
400fbf9f | 4950 | } |
f0c70ef0 RS |
4951 | else if (require_constant |
4952 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
4953 | { |
4954 | error_init ("initializer element%s is not computable at load time", | |
de520661 | 4955 | " for `%s'", NULL); |
047de90b | 4956 | inside_init = error_mark_node; |
400fbf9f JW |
4957 | } |
4958 | ||
047de90b | 4959 | return inside_init; |
400fbf9f JW |
4960 | } |
4961 | ||
4962 | if (element && (TREE_TYPE (element) == type | |
4963 | || (code == ARRAY_TYPE && TREE_TYPE (element) | |
4964 | && comptypes (TREE_TYPE (element), type)))) | |
4965 | { | |
4966 | if (code == ARRAY_TYPE) | |
4967 | { | |
4968 | error_init ("array%s initialized from non-constant array expression", | |
de520661 | 4969 | " `%s'", NULL); |
400fbf9f JW |
4970 | return error_mark_node; |
4971 | } | |
4972 | if (pedantic && (code == RECORD_TYPE || code == UNION_TYPE)) | |
4973 | pedwarn ("single-expression nonscalar initializer has braces"); | |
4974 | if (optimize && TREE_READONLY (element) && TREE_CODE (element) == VAR_DECL) | |
4975 | element = decl_constant_value (element); | |
4976 | ||
4977 | if (require_constant && ! TREE_CONSTANT (element)) | |
4978 | { | |
4979 | error_init ("initializer element%s is not constant", | |
de520661 | 4980 | " for `%s'", NULL); |
400fbf9f JW |
4981 | element = error_mark_node; |
4982 | } | |
f0c70ef0 RS |
4983 | else if (require_constant |
4984 | && initializer_constant_valid_p (element, TREE_TYPE (element)) == 0) | |
400fbf9f JW |
4985 | { |
4986 | error_init ("initializer element%s is not computable at load time", | |
de520661 | 4987 | " for `%s'", NULL); |
400fbf9f JW |
4988 | element = error_mark_node; |
4989 | } | |
4990 | ||
4991 | return element; | |
4992 | } | |
4993 | ||
400fbf9f JW |
4994 | /* Handle scalar types, including conversions. */ |
4995 | ||
4996 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE | |
337633f9 | 4997 | || code == ENUMERAL_TYPE || code == COMPLEX_TYPE) |
400fbf9f | 4998 | { |
d45cf215 RS |
4999 | SAVE_SPELLING_DEPTH |
5000 | ({ | |
0b1dffa7 RS |
5001 | /* Note that convert_for_assignment calls default_conversion |
5002 | for arrays and functions. We must not call it in the | |
5003 | case where inside_init is a null pointer constant. */ | |
cdc54cc9 | 5004 | inside_init |
de520661 | 5005 | = convert_for_assignment (type, init, |
9b7267b8 RS |
5006 | &initialization_message, |
5007 | NULL_TREE, NULL_TREE, 0); | |
d45cf215 | 5008 | }); |
400fbf9f | 5009 | |
047de90b | 5010 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f JW |
5011 | { |
5012 | error_init ("initializer element%s is not constant", | |
de520661 | 5013 | " for `%s'", NULL); |
047de90b | 5014 | inside_init = error_mark_node; |
400fbf9f | 5015 | } |
f0c70ef0 RS |
5016 | else if (require_constant |
5017 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
5018 | { |
5019 | error_init ("initializer element%s is not computable at load time", | |
de520661 | 5020 | " for `%s'", NULL); |
047de90b | 5021 | inside_init = error_mark_node; |
400fbf9f JW |
5022 | } |
5023 | ||
047de90b | 5024 | return inside_init; |
400fbf9f JW |
5025 | } |
5026 | ||
5027 | /* Come here only for records and arrays. */ | |
5028 | ||
5029 | if (TYPE_SIZE (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
5030 | { | |
5031 | error_init ("variable-sized object%s may not be initialized", | |
de520661 | 5032 | " `%s'", NULL); |
400fbf9f JW |
5033 | return error_mark_node; |
5034 | } | |
5035 | ||
de520661 | 5036 | error_init ("invalid initializer%s", " for `%s'", NULL); |
400fbf9f JW |
5037 | return error_mark_node; |
5038 | } | |
5039 | \f | |
de520661 | 5040 | /* Handle initializers that use braces. */ |
400fbf9f | 5041 | |
34403047 | 5042 | static void output_init_element (); |
de520661 RS |
5043 | static void output_pending_init_elements (); |
5044 | static void check_init_type_bitfields (); | |
400fbf9f | 5045 | |
de520661 RS |
5046 | /* Type of object we are accumulating a constructor for. |
5047 | This type is always a RECORD_TYPE, UNION_TYPE or ARRAY_TYPE. */ | |
5048 | static tree constructor_type; | |
400fbf9f | 5049 | |
de520661 RS |
5050 | /* For a RECORD_TYPE or UNION_TYPE, this is the chain of fields |
5051 | left to fill. */ | |
5052 | static tree constructor_fields; | |
400fbf9f | 5053 | |
de520661 RS |
5054 | /* For an ARRAY_TYPE, this is the specified index |
5055 | at which to store the next element we get. | |
5056 | This is a special INTEGER_CST node that we modify in place. */ | |
5057 | static tree constructor_index; | |
400fbf9f | 5058 | |
de520661 RS |
5059 | /* For an ARRAY_TYPE, this is the end index of the range |
5060 | to intitialize with the next element, or NULL in the ordinary case | |
5061 | where the element is used just once. */ | |
5062 | static tree constructor_range_end; | |
400fbf9f | 5063 | |
de520661 RS |
5064 | /* For an ARRAY_TYPE, this is the maximum index. */ |
5065 | static tree constructor_max_index; | |
103b7b17 | 5066 | |
de520661 RS |
5067 | /* For a RECORD_TYPE, this is the first field not yet written out. */ |
5068 | static tree constructor_unfilled_fields; | |
400fbf9f | 5069 | |
de520661 RS |
5070 | /* For an ARRAY_TYPE, this is the index of the first element |
5071 | not yet written out. | |
5072 | This is a special INTEGER_CST node that we modify in place. */ | |
5073 | static tree constructor_unfilled_index; | |
5074 | ||
b62acd60 RS |
5075 | /* In a RECORD_TYPE, the byte index of the next consecutive field. |
5076 | This is so we can generate gaps between fields, when appropriate. | |
5077 | This is a special INTEGER_CST node that we modify in place. */ | |
5078 | static tree constructor_bit_index; | |
5079 | ||
de520661 RS |
5080 | /* If we are saving up the elements rather than allocating them, |
5081 | this is the list of elements so far (in reverse order, | |
5082 | most recent first). */ | |
5083 | static tree constructor_elements; | |
5084 | ||
5085 | /* 1 if so far this constructor's elements are all compile-time constants. */ | |
5086 | static int constructor_constant; | |
5087 | ||
5088 | /* 1 if so far this constructor's elements are all valid address constants. */ | |
5089 | static int constructor_simple; | |
5090 | ||
5091 | /* 1 if this constructor is erroneous so far. */ | |
5092 | static int constructor_erroneous; | |
5093 | ||
5094 | /* 1 if have called defer_addressed_constants. */ | |
5095 | static int constructor_subconstants_deferred; | |
5096 | ||
5097 | /* List of pending elements at this constructor level. | |
5098 | These are elements encountered out of order | |
5099 | which belong at places we haven't reached yet in actually | |
5100 | writing the output. */ | |
5101 | static tree constructor_pending_elts; | |
5102 | ||
5103 | /* The SPELLING_DEPTH of this constructor. */ | |
5104 | static int constructor_depth; | |
5105 | ||
5106 | /* 1 if this constructor level was entered implicitly. */ | |
5107 | static int constructor_implicit; | |
5108 | ||
5109 | static int require_constant_value; | |
5110 | static int require_constant_elements; | |
5111 | ||
5112 | /* 1 if it is ok to output this constructor as we read it. | |
5113 | 0 means must accumulate a CONSTRUCTOR expression. */ | |
5114 | static int constructor_incremental; | |
5115 | ||
5116 | /* DECL node for which an initializer is being read. | |
5117 | 0 means we are reading a constructor expression | |
5118 | such as (struct foo) {...}. */ | |
5119 | static tree constructor_decl; | |
5120 | ||
5121 | /* start_init saves the ASMSPEC arg here for really_start_incremental_init. */ | |
5122 | static char *constructor_asmspec; | |
5123 | ||
5124 | /* Nonzero if this is an initializer for a top-level decl. */ | |
5125 | static int constructor_top_level; | |
5126 | ||
5127 | /* When we finish reading a constructor expression | |
5128 | (constructor_decl is 0), the CONSTRUCTOR goes here. */ | |
5129 | static tree constructor_result; | |
b62acd60 RS |
5130 | \f |
5131 | /* This stack has a level for each implicit or explicit level of | |
5132 | structuring in the initializer, including the outermost one. It | |
5133 | saves the values of most of the variables above. */ | |
de520661 RS |
5134 | |
5135 | struct constructor_stack | |
400fbf9f | 5136 | { |
de520661 RS |
5137 | struct constructor_stack *next; |
5138 | tree type; | |
5139 | tree fields; | |
5140 | tree index; | |
5141 | tree range_end; | |
5142 | tree max_index; | |
5143 | tree unfilled_index; | |
5144 | tree unfilled_fields; | |
b62acd60 | 5145 | tree bit_index; |
de520661 RS |
5146 | tree elements; |
5147 | int offset; | |
5148 | tree pending_elts; | |
5149 | int depth; | |
790e9490 RS |
5150 | /* If nonzero, this value should replace the entire |
5151 | constructor at this level. */ | |
5152 | tree replacement_value; | |
de520661 RS |
5153 | char constant; |
5154 | char simple; | |
5155 | char implicit; | |
5156 | char incremental; | |
5157 | char erroneous; | |
5158 | char outer; | |
5159 | }; | |
d45cf215 | 5160 | |
de520661 | 5161 | struct constructor_stack *constructor_stack; |
400fbf9f | 5162 | |
de520661 RS |
5163 | /* This stack records separate initializers that are nested. |
5164 | Nested initializers can't happen in ANSI C, but GNU C allows them | |
5165 | in cases like { ... (struct foo) { ... } ... }. */ | |
400fbf9f | 5166 | |
de520661 RS |
5167 | struct initializer_stack |
5168 | { | |
5169 | struct initializer_stack *next; | |
5170 | tree decl; | |
5171 | char *asmspec; | |
5172 | struct constructor_stack *constructor_stack; | |
5173 | struct spelling *spelling; | |
5174 | struct spelling *spelling_base; | |
5175 | int spelling_size; | |
5176 | char top_level; | |
5177 | char incremental; | |
5178 | char require_constant_value; | |
5179 | char require_constant_elements; | |
5180 | char deferred; | |
5181 | }; | |
5182 | ||
5183 | struct initializer_stack *initializer_stack; | |
5184 | \f | |
5185 | /* Prepare to parse and output the initializer for variable DECL. */ | |
5186 | ||
5187 | void | |
e28cae4f | 5188 | start_init (decl, asmspec_tree, top_level) |
de520661 | 5189 | tree decl; |
e28cae4f | 5190 | tree asmspec_tree; |
de520661 RS |
5191 | int top_level; |
5192 | { | |
5193 | char *locus; | |
5194 | struct initializer_stack *p | |
5195 | = (struct initializer_stack *) xmalloc (sizeof (struct initializer_stack)); | |
e28cae4f RS |
5196 | char *asmspec = 0; |
5197 | ||
5198 | if (asmspec_tree) | |
5199 | asmspec = TREE_STRING_POINTER (asmspec_tree); | |
de520661 RS |
5200 | |
5201 | p->decl = constructor_decl; | |
5202 | p->asmspec = constructor_asmspec; | |
5203 | p->incremental = constructor_incremental; | |
5204 | p->require_constant_value = require_constant_value; | |
5205 | p->require_constant_elements = require_constant_elements; | |
5206 | p->constructor_stack = constructor_stack; | |
5207 | p->spelling = spelling; | |
5208 | p->spelling_base = spelling_base; | |
5209 | p->spelling_size = spelling_size; | |
5210 | p->deferred = constructor_subconstants_deferred; | |
5211 | p->top_level = constructor_top_level; | |
b62acd60 | 5212 | p->next = initializer_stack; |
de520661 RS |
5213 | initializer_stack = p; |
5214 | ||
5215 | constructor_decl = decl; | |
5216 | constructor_incremental = top_level; | |
5217 | constructor_asmspec = asmspec; | |
5218 | constructor_subconstants_deferred = 0; | |
5219 | constructor_top_level = top_level; | |
5220 | ||
5221 | if (decl != 0) | |
3c3fa147 | 5222 | { |
de520661 RS |
5223 | require_constant_value = TREE_STATIC (decl); |
5224 | require_constant_elements = TREE_STATIC (decl) || pedantic; | |
5225 | locus = IDENTIFIER_POINTER (DECL_NAME (decl)); | |
5226 | constructor_incremental |= TREE_STATIC (decl); | |
3c3fa147 | 5227 | } |
400fbf9f | 5228 | else |
de520661 RS |
5229 | { |
5230 | require_constant_value = 0; | |
5231 | require_constant_elements = 0; | |
5232 | locus = "(anonymous)"; | |
5233 | } | |
400fbf9f | 5234 | |
de520661 | 5235 | constructor_stack = 0; |
400fbf9f | 5236 | |
de520661 RS |
5237 | spelling_base = 0; |
5238 | spelling_size = 0; | |
5239 | RESTORE_SPELLING_DEPTH (0); | |
d45cf215 | 5240 | |
de520661 RS |
5241 | if (locus) |
5242 | push_string (locus); | |
5243 | } | |
400fbf9f | 5244 | |
de520661 RS |
5245 | void |
5246 | finish_init () | |
5247 | { | |
5248 | struct initializer_stack *p = initializer_stack; | |
400fbf9f | 5249 | |
de520661 RS |
5250 | /* Output subconstants (string constants, usually) |
5251 | that were referenced within this initializer and saved up. | |
5252 | Must do this if and only if we called defer_addressed_constants. */ | |
5253 | if (constructor_subconstants_deferred) | |
5254 | output_deferred_addressed_constants (); | |
4f77a31b | 5255 | |
de520661 RS |
5256 | /* Free the whole constructor stack of this initializer. */ |
5257 | while (constructor_stack) | |
5258 | { | |
5259 | struct constructor_stack *q = constructor_stack; | |
5260 | constructor_stack = q->next; | |
5261 | free (q); | |
5262 | } | |
400fbf9f | 5263 | |
de520661 RS |
5264 | /* Pop back to the data of the outer initializer (if any). */ |
5265 | constructor_decl = p->decl; | |
5266 | constructor_asmspec = p->asmspec; | |
5267 | constructor_incremental = p->incremental; | |
5268 | require_constant_value = p->require_constant_value; | |
5269 | require_constant_elements = p->require_constant_elements; | |
5270 | constructor_stack = p->constructor_stack; | |
5271 | spelling = p->spelling; | |
5272 | spelling_base = p->spelling_base; | |
5273 | spelling_size = p->spelling_size; | |
5274 | constructor_subconstants_deferred = p->deferred; | |
5275 | constructor_top_level = p->top_level; | |
5276 | initializer_stack = p->next; | |
5277 | free (p); | |
5278 | } | |
5279 | \f | |
5280 | /* Call here when we see the initializer is surrounded by braces. | |
5281 | This is instead of a call to push_init_level; | |
5282 | it is matched by a call to pop_init_level. | |
400fbf9f | 5283 | |
de520661 RS |
5284 | TYPE is the type to initialize, for a constructor expression. |
5285 | For an initializer for a decl, TYPE is zero. */ | |
5a7ec9d9 | 5286 | |
de520661 RS |
5287 | void |
5288 | really_start_incremental_init (type) | |
5289 | tree type; | |
5290 | { | |
5291 | struct constructor_stack *p | |
5292 | = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); | |
5293 | ||
5294 | if (type == 0) | |
5295 | type = TREE_TYPE (constructor_decl); | |
5296 | ||
5297 | /* Turn off constructor_incremental if type is a struct with bitfields. | |
5298 | Do this before the first push, so that the corrected value | |
5299 | is available in finish_init. */ | |
5300 | check_init_type_bitfields (type); | |
5301 | ||
5302 | p->type = constructor_type; | |
5303 | p->fields = constructor_fields; | |
5304 | p->index = constructor_index; | |
5305 | p->range_end = constructor_range_end; | |
5306 | p->max_index = constructor_max_index; | |
5307 | p->unfilled_index = constructor_unfilled_index; | |
5308 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5309 | p->bit_index = constructor_bit_index; |
de520661 RS |
5310 | p->elements = 0; |
5311 | p->constant = constructor_constant; | |
5312 | p->simple = constructor_simple; | |
5313 | p->erroneous = constructor_erroneous; | |
5314 | p->pending_elts = constructor_pending_elts; | |
5315 | p->depth = constructor_depth; | |
790e9490 | 5316 | p->replacement_value = 0; |
de520661 RS |
5317 | p->implicit = 0; |
5318 | p->incremental = constructor_incremental; | |
5319 | p->outer = 0; | |
5320 | p->next = 0; | |
5321 | constructor_stack = p; | |
5322 | ||
5323 | constructor_constant = 1; | |
5324 | constructor_simple = 1; | |
5325 | constructor_depth = SPELLING_DEPTH (); | |
5326 | constructor_elements = 0; | |
5327 | constructor_pending_elts = 0; | |
5328 | constructor_type = type; | |
5329 | ||
5330 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5331 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5332 | { | |
5333 | constructor_fields = TYPE_FIELDS (constructor_type); | |
5334 | constructor_unfilled_fields = constructor_fields; | |
b62acd60 | 5335 | constructor_bit_index = copy_node (integer_zero_node); |
de520661 RS |
5336 | } |
5337 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5338 | { | |
5339 | constructor_index = copy_node (integer_zero_node); | |
5340 | constructor_range_end = 0; | |
5341 | constructor_unfilled_index = copy_node (integer_zero_node); | |
5342 | if (TYPE_DOMAIN (constructor_type)) | |
5343 | constructor_max_index | |
5344 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
5345 | } | |
5346 | else | |
5347 | { | |
5348 | /* Handle the case of int x = {5}; */ | |
5349 | constructor_fields = constructor_type; | |
5350 | constructor_unfilled_fields = constructor_type; | |
5351 | } | |
400fbf9f | 5352 | |
de520661 RS |
5353 | if (constructor_incremental) |
5354 | { | |
5355 | int momentary = suspend_momentary (); | |
5356 | push_obstacks_nochange (); | |
5357 | if (TREE_PERMANENT (constructor_decl)) | |
5358 | end_temporary_allocation (); | |
5359 | make_decl_rtl (constructor_decl, constructor_asmspec, | |
5360 | constructor_top_level); | |
5361 | assemble_variable (constructor_decl, constructor_top_level, 0, 1); | |
5362 | pop_obstacks (); | |
5363 | resume_momentary (momentary); | |
5364 | } | |
400fbf9f | 5365 | |
de520661 RS |
5366 | if (constructor_incremental) |
5367 | { | |
5368 | defer_addressed_constants (); | |
5369 | constructor_subconstants_deferred = 1; | |
5370 | } | |
5371 | } | |
5372 | \f | |
5373 | /* Push down into a subobject, for initialization. | |
5374 | If this is for an explicit set of braces, IMPLICIT is 0. | |
5375 | If it is because the next element belongs at a lower level, | |
5376 | IMPLICIT is 1. */ | |
400fbf9f | 5377 | |
de520661 RS |
5378 | void |
5379 | push_init_level (implicit) | |
5380 | int implicit; | |
5381 | { | |
5382 | struct constructor_stack *p | |
5383 | = (struct constructor_stack *) xmalloc (sizeof (struct constructor_stack)); | |
5384 | p->type = constructor_type; | |
5385 | p->fields = constructor_fields; | |
5386 | p->index = constructor_index; | |
5387 | p->range_end = constructor_range_end; | |
5388 | p->max_index = constructor_max_index; | |
5389 | p->unfilled_index = constructor_unfilled_index; | |
5390 | p->unfilled_fields = constructor_unfilled_fields; | |
b62acd60 | 5391 | p->bit_index = constructor_bit_index; |
de520661 RS |
5392 | p->elements = constructor_elements; |
5393 | p->constant = constructor_constant; | |
5394 | p->simple = constructor_simple; | |
5395 | p->erroneous = constructor_erroneous; | |
5396 | p->pending_elts = constructor_pending_elts; | |
5397 | p->depth = constructor_depth; | |
790e9490 | 5398 | p->replacement_value = 0; |
de520661 RS |
5399 | p->implicit = implicit; |
5400 | p->incremental = constructor_incremental; | |
5401 | p->outer = 0; | |
5402 | p->next = constructor_stack; | |
5403 | constructor_stack = p; | |
5404 | ||
5405 | constructor_constant = 1; | |
5406 | constructor_simple = 1; | |
5407 | constructor_depth = SPELLING_DEPTH (); | |
5408 | constructor_elements = 0; | |
5409 | constructor_pending_elts = 0; | |
5410 | ||
5411 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5412 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5413 | { | |
5414 | constructor_type = TREE_TYPE (constructor_fields); | |
5415 | push_member_name (IDENTIFIER_POINTER (DECL_NAME (constructor_fields))); | |
5416 | } | |
5417 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5418 | { | |
5419 | constructor_type = TREE_TYPE (constructor_type); | |
5420 | push_array_bounds (TREE_INT_CST_LOW (constructor_index)); | |
5421 | } | |
400fbf9f | 5422 | |
de520661 RS |
5423 | /* Turn off constructor_incremental if type is a struct with bitfields. */ |
5424 | check_init_type_bitfields (constructor_type); | |
4f77a31b | 5425 | |
de520661 RS |
5426 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5427 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5428 | { | |
5429 | constructor_fields = TYPE_FIELDS (constructor_type); | |
5430 | constructor_unfilled_fields = constructor_fields; | |
b62acd60 | 5431 | constructor_bit_index = copy_node (integer_zero_node); |
de520661 RS |
5432 | } |
5433 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5434 | { | |
5435 | constructor_index = copy_node (integer_zero_node); | |
5436 | constructor_range_end = 0; | |
5437 | constructor_unfilled_index = copy_node (integer_zero_node); | |
5438 | if (TYPE_DOMAIN (constructor_type)) | |
5439 | constructor_max_index | |
5440 | = TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)); | |
5441 | } | |
5442 | else | |
5443 | { | |
790e9490 | 5444 | warning ("braces around scalar initializer"); |
de520661 RS |
5445 | constructor_fields = constructor_type; |
5446 | constructor_unfilled_fields = constructor_type; | |
5447 | } | |
5448 | } | |
400fbf9f | 5449 | |
de520661 RS |
5450 | /* Don't read a struct incrementally if it has any bitfields, |
5451 | because the incremental reading code doesn't know how to | |
5452 | handle bitfields yet. */ | |
d45cf215 | 5453 | |
de520661 RS |
5454 | static void |
5455 | check_init_type_bitfields (type) | |
5456 | tree type; | |
5457 | { | |
5458 | if (TREE_CODE (type) == RECORD_TYPE) | |
5459 | { | |
5460 | tree tail; | |
5461 | for (tail = TYPE_FIELDS (type); tail; | |
5462 | tail = TREE_CHAIN (tail)) | |
5463 | if (DECL_BIT_FIELD (tail)) | |
400fbf9f | 5464 | { |
de520661 RS |
5465 | constructor_incremental = 0; |
5466 | break; | |
400fbf9f | 5467 | } |
400fbf9f | 5468 | } |
de520661 RS |
5469 | } |
5470 | ||
5471 | /* At the end of an implicit or explicit brace level, | |
5472 | finish up that level of constructor. | |
5473 | If we were outputting the elements as they are read, return 0 | |
5474 | from inner levels (process_init_element ignores that), | |
5475 | but return error_mark_node from the outermost level | |
5476 | (that's what we want to put in DECL_INITIAL). | |
5477 | Otherwise, return a CONSTRUCTOR expression. */ | |
5478 | ||
5479 | tree | |
5480 | pop_init_level (implicit) | |
5481 | int implicit; | |
5482 | { | |
5483 | struct constructor_stack *p; | |
5484 | int size; | |
5485 | tree constructor = 0; | |
5486 | ||
5487 | if (implicit == 0) | |
400fbf9f | 5488 | { |
de520661 RS |
5489 | /* When we come to an explicit close brace, |
5490 | pop any inner levels that didn't have explicit braces. */ | |
5491 | while (constructor_stack->implicit) | |
5492 | process_init_element (pop_init_level (1)); | |
5493 | } | |
400fbf9f | 5494 | |
de520661 RS |
5495 | p = constructor_stack; |
5496 | size = int_size_in_bytes (constructor_type); | |
400fbf9f | 5497 | |
de520661 RS |
5498 | /* Now output all pending elements. */ |
5499 | output_pending_init_elements (1); | |
5500 | ||
b62acd60 RS |
5501 | #if 0 /* c-parse.in warns about {}. */ |
5502 | /* In ANSI, each brace level must have at least one element. */ | |
5503 | if (! implicit && pedantic | |
5504 | && (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5505 | ? integer_zerop (constructor_unfilled_index) | |
5506 | : constructor_unfilled_fields == TYPE_FIELDS (constructor_type))) | |
5507 | pedwarn_init ("empty braces in initializer%s", " for `%s'", NULL); | |
5508 | #endif | |
5509 | ||
de520661 RS |
5510 | /* Pad out the end of the structure. */ |
5511 | ||
790e9490 RS |
5512 | if (p->replacement_value) |
5513 | { | |
5514 | /* If this closes a superfluous brace pair, | |
5515 | just pass out the element between them. */ | |
5516 | constructor = p->replacement_value; | |
5517 | /* If this is the top level thing within the initializer, | |
d11fdb45 | 5518 | and it's for a variable, then since we already called |
790e9490 RS |
5519 | assemble_variable, we must output the value now. */ |
5520 | if (p->next == 0 && constructor_decl != 0 | |
5521 | && constructor_incremental) | |
5522 | { | |
5523 | constructor = digest_init (constructor_type, constructor, | |
5524 | 0, 0); | |
5525 | ||
5526 | /* If initializing an array of unknown size, | |
5527 | determine the size now. */ | |
5528 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5529 | && TYPE_DOMAIN (constructor_type) == 0) | |
5530 | { | |
5531 | int failure; | |
5532 | ||
5533 | push_obstacks_nochange (); | |
5534 | if (TREE_PERMANENT (constructor_type)) | |
5535 | end_temporary_allocation (); | |
5536 | ||
5537 | /* We shouldn't have an incomplete array type within | |
5538 | some other type. */ | |
5539 | if (constructor_stack->next) | |
5540 | abort (); | |
5541 | ||
5542 | failure | |
5543 | = complete_array_type (constructor_type, | |
5544 | constructor, 0); | |
5545 | if (failure) | |
5546 | abort (); | |
5547 | ||
5548 | size = int_size_in_bytes (constructor_type); | |
5549 | pop_obstacks (); | |
5550 | } | |
5551 | ||
5552 | output_constant (constructor, size); | |
5553 | } | |
5554 | } | |
5555 | else if (! constructor_incremental) | |
de520661 RS |
5556 | { |
5557 | if (constructor_erroneous) | |
5558 | constructor = error_mark_node; | |
5559 | else | |
400fbf9f | 5560 | { |
de520661 RS |
5561 | int momentary = suspend_momentary (); |
5562 | ||
5563 | constructor = build (CONSTRUCTOR, constructor_type, NULL_TREE, | |
5564 | nreverse (constructor_elements)); | |
5565 | if (constructor_constant) | |
5566 | TREE_CONSTANT (constructor) = 1; | |
5567 | if (constructor_constant && constructor_simple) | |
5568 | TREE_STATIC (constructor) = 1; | |
5569 | resume_momentary (momentary); | |
5570 | } | |
5571 | } | |
5572 | else | |
5573 | { | |
5574 | tree filled; | |
5575 | int momentary = suspend_momentary (); | |
400fbf9f | 5576 | |
de520661 RS |
5577 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5578 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5579 | { | |
de520661 RS |
5580 | /* Find the offset of the end of that field. */ |
5581 | filled = size_binop (CEIL_DIV_EXPR, | |
b62acd60 | 5582 | constructor_bit_index, |
de520661 RS |
5583 | size_int (BITS_PER_UNIT)); |
5584 | } | |
5585 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5586 | { | |
5587 | /* If initializing an array of unknown size, | |
5588 | determine the size now. */ | |
5589 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5590 | && TYPE_DOMAIN (constructor_type) == 0) | |
400fbf9f | 5591 | { |
de520661 RS |
5592 | tree maxindex |
5593 | = size_binop (MINUS_EXPR, | |
5594 | constructor_unfilled_index, | |
5595 | integer_one_node); | |
5596 | ||
5597 | push_obstacks_nochange (); | |
5598 | if (TREE_PERMANENT (constructor_type)) | |
5599 | end_temporary_allocation (); | |
5600 | maxindex = copy_node (maxindex); | |
5601 | TYPE_DOMAIN (constructor_type) = build_index_type (maxindex); | |
5602 | TREE_TYPE (maxindex) = TYPE_DOMAIN (constructor_type); | |
5603 | ||
5604 | /* We shouldn't have an incomplete array type within | |
5605 | some other type. */ | |
5606 | if (constructor_stack->next) | |
5607 | abort (); | |
400fbf9f | 5608 | |
de520661 RS |
5609 | if (pedantic |
5610 | && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (constructor_type)), | |
5611 | integer_zero_node)) | |
5612 | error_with_decl (constructor_decl, "zero-size array `%s'"); | |
5613 | layout_type (constructor_type); | |
5614 | size = int_size_in_bytes (constructor_type); | |
5615 | pop_obstacks (); | |
400fbf9f JW |
5616 | } |
5617 | ||
de520661 RS |
5618 | filled = size_binop (MULT_EXPR, constructor_unfilled_index, |
5619 | size_in_bytes (TREE_TYPE (constructor_type))); | |
5620 | } | |
5621 | else | |
5622 | filled = 0; | |
400fbf9f | 5623 | |
de520661 RS |
5624 | if (filled != 0) |
5625 | assemble_zeros (size - TREE_INT_CST_LOW (filled)); | |
5626 | ||
5627 | resume_momentary (momentary); | |
5628 | } | |
5629 | ||
5630 | ||
5631 | constructor_type = p->type; | |
5632 | constructor_fields = p->fields; | |
5633 | constructor_index = p->index; | |
5634 | constructor_range_end = p->range_end; | |
5635 | constructor_max_index = p->max_index; | |
5636 | constructor_unfilled_index = p->unfilled_index; | |
5637 | constructor_unfilled_fields = p->unfilled_fields; | |
b62acd60 | 5638 | constructor_bit_index = p->bit_index; |
de520661 RS |
5639 | constructor_elements = p->elements; |
5640 | constructor_constant = p->constant; | |
5641 | constructor_simple = p->simple; | |
5642 | constructor_erroneous = p->erroneous; | |
5643 | constructor_pending_elts = p->pending_elts; | |
5644 | constructor_depth = p->depth; | |
5645 | constructor_incremental = p->incremental; | |
5646 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
5647 | ||
5648 | constructor_stack = p->next; | |
5649 | free (p); | |
5650 | ||
5651 | if (constructor == 0) | |
5652 | { | |
5653 | if (constructor_stack == 0) | |
5654 | return error_mark_node; | |
5655 | return NULL_TREE; | |
5656 | } | |
5657 | return constructor; | |
5658 | } | |
5659 | ||
5660 | /* Within an array initializer, specify the next index to be initialized. | |
5661 | FIRST is that index. If LAST is nonzero, then initialize a range | |
5662 | of indices, running from FIRST through LAST. */ | |
5663 | ||
5664 | void | |
5665 | set_init_index (first, last) | |
5666 | tree first, last; | |
5667 | { | |
5668 | if (tree_int_cst_lt (first, constructor_unfilled_index)) | |
5669 | error_init ("duplicate array index in initializer%s", " for `%s'", NULL); | |
5670 | else | |
5671 | { | |
5672 | TREE_INT_CST_LOW (constructor_index) | |
5673 | = TREE_INT_CST_LOW (first); | |
5674 | TREE_INT_CST_HIGH (constructor_index) | |
5675 | = TREE_INT_CST_HIGH (first); | |
5676 | ||
5677 | if (last != 0 && tree_int_cst_lt (last, first)) | |
5678 | error_init ("empty index range in initializer%s", " for `%s'", NULL); | |
5679 | else | |
b62acd60 RS |
5680 | { |
5681 | if (pedantic) | |
5682 | pedwarn ("ANSI C forbids specifying element to initialize"); | |
5683 | constructor_range_end = last; | |
5684 | } | |
de520661 RS |
5685 | } |
5686 | } | |
5687 | ||
5688 | /* Within a struct initializer, specify the next field to be initialized. */ | |
5689 | ||
5690 | void | |
5691 | set_init_label (fieldname) | |
5692 | tree fieldname; | |
5693 | { | |
5694 | tree tail; | |
5695 | int passed = 0; | |
5696 | ||
5697 | for (tail = TYPE_FIELDS (constructor_type); tail; | |
5698 | tail = TREE_CHAIN (tail)) | |
5699 | { | |
5700 | if (tail == constructor_unfilled_fields) | |
5701 | passed = 1; | |
5702 | if (DECL_NAME (tail) == fieldname) | |
5703 | break; | |
5704 | } | |
5705 | ||
5706 | if (tail == 0) | |
5707 | error ("unknown field `%s' specified in initializer", | |
5708 | IDENTIFIER_POINTER (fieldname)); | |
5709 | else if (!passed) | |
5710 | error ("field `%s' already initialized", | |
5711 | IDENTIFIER_POINTER (fieldname)); | |
5712 | else | |
b62acd60 RS |
5713 | { |
5714 | constructor_fields = tail; | |
5715 | if (pedantic) | |
5716 | pedwarn ("ANSI C forbids specifying structure member to initialize"); | |
5717 | } | |
de520661 RS |
5718 | } |
5719 | \f | |
5720 | /* "Output" the next constructor element. | |
5721 | At top level, really output it to assembler code now. | |
5722 | Otherwise, collect it in a list from which we will make a CONSTRUCTOR. | |
5723 | TYPE is the data type that the containing data type wants here. | |
5724 | FIELD is the field (a FIELD_DECL) or the index that this element fills. | |
5725 | ||
5726 | PENDING if non-nil means output pending elements that belong | |
5727 | right after this element. (PENDING is normally 1; | |
5728 | it is 0 while outputting pending elements, to avoid recursion.) */ | |
5729 | ||
34403047 | 5730 | static void |
de520661 RS |
5731 | output_init_element (value, type, field, pending) |
5732 | tree value, type, field; | |
5733 | int pending; | |
5734 | { | |
5735 | int duplicate = 0; | |
5736 | ||
d3ab9753 RS |
5737 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE |
5738 | || (TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
5739 | && comptypes (TREE_TYPE (value), type))) | |
5740 | value = default_conversion (value); | |
5741 | ||
5742 | if (value == error_mark_node) | |
5743 | constructor_erroneous = 1; | |
5744 | else if (!TREE_CONSTANT (value)) | |
5745 | constructor_constant = 0; | |
5746 | else if (initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) | |
5747 | constructor_simple = 0; | |
5748 | ||
de520661 RS |
5749 | if (require_constant_value && ! TREE_CONSTANT (value)) |
5750 | { | |
5751 | error_init ("initializer element%s is not constant", | |
5752 | " for `%s'", NULL); | |
5753 | value = error_mark_node; | |
5754 | } | |
5755 | else if (require_constant_elements | |
5756 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) | |
5757 | { | |
5758 | error_init ("initializer element%s is not computable at load time", | |
5759 | " for `%s'", NULL); | |
5760 | value = error_mark_node; | |
5761 | } | |
5762 | ||
5763 | /* If this element duplicates one on constructor_pending_elts, | |
5764 | print a message and ignore it. Don't do this when we're | |
5765 | processing elements taken off constructor_pending_elts, | |
5766 | because we'd always get spurious errors. */ | |
5767 | if (pending) | |
5768 | { | |
5769 | if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5770 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5771 | { | |
5772 | if (purpose_member (field, constructor_pending_elts)) | |
400fbf9f | 5773 | { |
de520661 RS |
5774 | error_init ("duplicate initializer%s", " for `%s'", NULL); |
5775 | duplicate = 1; | |
400fbf9f | 5776 | } |
de520661 RS |
5777 | } |
5778 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5779 | { | |
5780 | tree tail; | |
5781 | for (tail = constructor_pending_elts; tail; | |
5782 | tail = TREE_CHAIN (tail)) | |
5783 | if (TREE_PURPOSE (tail) != 0 | |
5784 | && TREE_CODE (TREE_PURPOSE (tail)) == INTEGER_CST | |
5785 | && tree_int_cst_equal (TREE_PURPOSE (tail), constructor_index)) | |
5786 | break; | |
400fbf9f | 5787 | |
de520661 | 5788 | if (tail != 0) |
400fbf9f | 5789 | { |
de520661 RS |
5790 | error_init ("duplicate initializer%s", " for `%s'", NULL); |
5791 | duplicate = 1; | |
400fbf9f | 5792 | } |
400fbf9f JW |
5793 | } |
5794 | } | |
400fbf9f | 5795 | |
de520661 RS |
5796 | /* If this element doesn't come next in sequence, |
5797 | put it on constructor_pending_elts. */ | |
5798 | if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
5799 | && !tree_int_cst_equal (field, constructor_unfilled_index)) | |
5800 | { | |
5801 | if (! duplicate) | |
5802 | constructor_pending_elts | |
5803 | = tree_cons (field, | |
d11fdb45 | 5804 | digest_init (type, value, 0, 0), |
de520661 RS |
5805 | constructor_pending_elts); |
5806 | } | |
5807 | else if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
5808 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5809 | && field != constructor_unfilled_fields) | |
5810 | { | |
5811 | if (!duplicate) | |
5812 | constructor_pending_elts | |
5813 | = tree_cons (field, | |
d11fdb45 | 5814 | digest_init (type, value, 0, 0), |
de520661 RS |
5815 | constructor_pending_elts); |
5816 | } | |
5817 | else | |
5818 | { | |
5819 | /* Otherwise, output this element either to | |
5820 | constructor_elements or to the assembler file. */ | |
400fbf9f | 5821 | |
de520661 | 5822 | if (!duplicate) |
c2f4acb7 | 5823 | { |
de520661 RS |
5824 | if (! constructor_incremental) |
5825 | constructor_elements | |
5826 | = tree_cons ((TREE_CODE (constructor_type) != ARRAY_TYPE | |
5827 | ? field : NULL), | |
d11fdb45 | 5828 | digest_init (type, value, 0, 0), |
de520661 RS |
5829 | constructor_elements); |
5830 | else | |
b62acd60 RS |
5831 | { |
5832 | /* Structure elements may require alignment. | |
5833 | Do this, if necessary. */ | |
5834 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5835 | { | |
5836 | /* Advance to offset of this element. */ | |
5837 | if (! tree_int_cst_equal (constructor_bit_index, | |
5838 | DECL_FIELD_BITPOS (constructor_fields))) | |
5839 | { | |
5840 | int next = (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)) | |
5841 | / BITS_PER_UNIT); | |
5842 | int here = (TREE_INT_CST_LOW (constructor_bit_index) | |
5843 | / BITS_PER_UNIT); | |
5844 | ||
5845 | assemble_zeros (next - here); | |
5846 | } | |
5847 | } | |
d11fdb45 RS |
5848 | output_constant (digest_init (type, value, 0, 0), |
5849 | int_size_in_bytes (type)); | |
b62acd60 RS |
5850 | |
5851 | /* For a record, keep track of end position of last field. */ | |
5852 | if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5853 | { | |
5854 | tree temp = size_binop (PLUS_EXPR, | |
5855 | DECL_FIELD_BITPOS (constructor_fields), | |
5856 | DECL_SIZE (constructor_fields)); | |
5857 | TREE_INT_CST_LOW (constructor_bit_index) | |
5858 | = TREE_INT_CST_LOW (temp); | |
5859 | TREE_INT_CST_HIGH (constructor_bit_index) | |
5860 | = TREE_INT_CST_HIGH (temp); | |
5861 | } | |
5862 | } | |
c2f4acb7 RS |
5863 | } |
5864 | ||
de520661 RS |
5865 | /* Advance the variable that indicates sequential elements output. */ |
5866 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
400fbf9f | 5867 | { |
de520661 RS |
5868 | tree tem = size_binop (PLUS_EXPR, constructor_unfilled_index, |
5869 | integer_one_node); | |
5870 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
5871 | = TREE_INT_CST_LOW (tem); | |
5872 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
5873 | = TREE_INT_CST_HIGH (tem); | |
5874 | } | |
5875 | else if (TREE_CODE (constructor_type) == RECORD_TYPE) | |
5876 | constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); | |
5877 | else if (TREE_CODE (constructor_type) == UNION_TYPE) | |
5878 | constructor_unfilled_fields = 0; | |
5879 | ||
5880 | /* Now output any pending elements which have become next. */ | |
5881 | if (pending) | |
5882 | output_pending_init_elements (0); | |
5883 | } | |
5884 | } | |
400fbf9f | 5885 | |
de520661 RS |
5886 | /* Output any pending elements which have become next. |
5887 | As we output elements, constructor_unfilled_{fields,index} | |
5888 | advances, which may cause other elements to become next; | |
5889 | if so, they too are output. | |
5890 | ||
5891 | If ALL is 0, we return when there are | |
5892 | no more pending elements to output now. | |
5893 | ||
5894 | If ALL is 1, we output space as necessary so that | |
5895 | we can output all the pending elements. */ | |
5896 | ||
5897 | static void | |
5898 | output_pending_init_elements (all) | |
5899 | int all; | |
5900 | { | |
5901 | tree tail; | |
5902 | tree next; | |
5903 | ||
5904 | retry: | |
5905 | ||
5906 | /* Look thru the whole pending list. | |
5907 | If we find an element that should be output now, | |
5908 | output it. Otherwise, set NEXT to the element | |
5909 | that comes first among those still pending. */ | |
5910 | ||
5911 | next = 0; | |
5912 | for (tail = constructor_pending_elts; tail; | |
5913 | tail = TREE_CHAIN (tail)) | |
5914 | { | |
5915 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) | |
5916 | { | |
5917 | if (tree_int_cst_equal (TREE_PURPOSE (tail), | |
5918 | constructor_unfilled_index)) | |
400fbf9f | 5919 | { |
de520661 RS |
5920 | output_init_element (TREE_VALUE (tail), TREE_TYPE (constructor_type), |
5921 | constructor_unfilled_index, 0); | |
5922 | goto retry; | |
5923 | } | |
5924 | else if (tree_int_cst_lt (TREE_PURPOSE (tail), | |
5925 | constructor_unfilled_index)) | |
5926 | ; | |
5927 | else if (next == 0 | |
5928 | || tree_int_cst_lt (TREE_PURPOSE (tail), | |
5929 | next)) | |
5930 | next = TREE_PURPOSE (tail); | |
5931 | } | |
5932 | else if (TREE_CODE (constructor_type) == RECORD_TYPE | |
5933 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
5934 | { | |
5935 | if (TREE_PURPOSE (tail) == constructor_unfilled_fields) | |
5936 | { | |
5937 | output_init_element (TREE_VALUE (tail), | |
5938 | TREE_TYPE (constructor_unfilled_fields), | |
5939 | constructor_unfilled_fields, | |
5940 | 0); | |
5941 | goto retry; | |
400fbf9f | 5942 | } |
de520661 RS |
5943 | else if (tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)), |
5944 | DECL_FIELD_BITPOS (constructor_unfilled_fields))) | |
5945 | ; | |
5946 | else if (next == 0 | |
5947 | || tree_int_cst_lt (DECL_FIELD_BITPOS (TREE_PURPOSE (tail)), | |
5948 | DECL_FIELD_BITPOS (next))) | |
5949 | next = TREE_PURPOSE (tail); | |
400fbf9f | 5950 | } |
de520661 RS |
5951 | } |
5952 | ||
5953 | /* Ordinarily return, but not if we want to output all | |
5954 | and there are elements left. */ | |
5955 | if (! (all && next != 0)) | |
5956 | return; | |
5957 | ||
5958 | /* Generate space up to the position of NEXT. */ | |
5959 | if (constructor_incremental) | |
5960 | { | |
5961 | tree filled; | |
5962 | tree nextpos_tree; | |
400fbf9f | 5963 | |
de520661 RS |
5964 | if (TREE_CODE (constructor_type) == RECORD_TYPE |
5965 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
400fbf9f | 5966 | { |
de520661 RS |
5967 | /* Find the last field written out. */ |
5968 | for (tail = TYPE_FIELDS (constructor_type); tail; | |
5969 | tail = TREE_CHAIN (tail)) | |
5970 | if (TREE_CHAIN (tail) == constructor_unfilled_fields) | |
5971 | break; | |
5972 | /* Find the offset of the end of that field. */ | |
5973 | filled = size_binop (CEIL_DIV_EXPR, | |
5974 | size_binop (PLUS_EXPR, | |
5975 | DECL_FIELD_BITPOS (tail), | |
5976 | DECL_SIZE (tail)), | |
5977 | size_int (BITS_PER_UNIT)); | |
5978 | nextpos_tree = size_binop (CEIL_DIV_EXPR, | |
5979 | DECL_FIELD_BITPOS (next), | |
5980 | size_int (BITS_PER_UNIT)); | |
5981 | constructor_unfilled_fields = next; | |
400fbf9f | 5982 | } |
de520661 | 5983 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
400fbf9f | 5984 | { |
de520661 RS |
5985 | filled = size_binop (MULT_EXPR, constructor_unfilled_index, |
5986 | size_in_bytes (TREE_TYPE (constructor_type))); | |
5987 | nextpos_tree | |
5988 | = size_binop (MULT_EXPR, next, | |
5989 | size_in_bytes (TREE_TYPE (constructor_type))); | |
5990 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
5991 | = TREE_INT_CST_LOW (next); | |
5992 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
5993 | = TREE_INT_CST_HIGH (next); | |
400fbf9f | 5994 | } |
de520661 RS |
5995 | else |
5996 | filled = 0; | |
400fbf9f | 5997 | |
de520661 | 5998 | if (filled) |
fe67cf58 | 5999 | { |
de520661 RS |
6000 | int nextpos = TREE_INT_CST_LOW (nextpos_tree); |
6001 | ||
6002 | assemble_zeros (nextpos - TREE_INT_CST_LOW (filled)); | |
fe67cf58 | 6003 | } |
de520661 RS |
6004 | } |
6005 | ||
6006 | goto retry; | |
6007 | } | |
6008 | \f | |
6009 | /* Add one non-braced element to the current constructor level. | |
6010 | This adjusts the current position within the constructor's type. | |
6011 | This may also start or terminate implicit levels | |
6012 | to handle a partly-braced initializer. | |
6013 | ||
6014 | Once this has found the correct level for the new element, | |
6015 | it calls output_init_element. | |
6016 | ||
6017 | Note: if we are incrementally outputting this constructor, | |
6018 | this function may be called with a null argument | |
6019 | representing a sub-constructor that was already incrementally output. | |
6020 | When that happens, we output nothing, but we do the bookkeeping | |
6021 | to skip past that element of the current constructor. */ | |
6022 | ||
6023 | void | |
6024 | process_init_element (value) | |
6025 | tree value; | |
6026 | { | |
b62acd60 RS |
6027 | tree orig_value = value; |
6028 | int string_flag = value != 0 && TREE_CODE (value) == STRING_CST; | |
6029 | ||
790e9490 RS |
6030 | /* Handle superfluous braces around string cst as in |
6031 | char x[] = {"foo"}; */ | |
6032 | if (string_flag | |
6033 | && TREE_CODE (constructor_type) == ARRAY_TYPE | |
61e215dd | 6034 | && TREE_CODE (TREE_TYPE (constructor_type)) == INTEGER_TYPE |
790e9490 RS |
6035 | && integer_zerop (constructor_unfilled_index)) |
6036 | { | |
6037 | constructor_stack->replacement_value = value; | |
6038 | return; | |
6039 | } | |
6040 | ||
790e9490 RS |
6041 | if (constructor_stack->replacement_value != 0) |
6042 | { | |
6043 | error_init ("excess elements in struct initializer%s", | |
6044 | " after `%s'", NULL_PTR); | |
6045 | return; | |
6046 | } | |
6047 | ||
de520661 RS |
6048 | /* If we've exhausted any levels that didn't have braces, |
6049 | pop them now. */ | |
6050 | while (constructor_stack->implicit) | |
6051 | { | |
6052 | if ((TREE_CODE (constructor_type) == RECORD_TYPE | |
6053 | || TREE_CODE (constructor_type) == UNION_TYPE) | |
6054 | && constructor_fields == 0) | |
6055 | process_init_element (pop_init_level (1)); | |
6056 | else if (TREE_CODE (constructor_type) == ARRAY_TYPE | |
6057 | && tree_int_cst_lt (constructor_max_index, constructor_index)) | |
6058 | process_init_element (pop_init_level (1)); | |
fe67cf58 | 6059 | else |
de520661 | 6060 | break; |
400fbf9f JW |
6061 | } |
6062 | ||
de520661 | 6063 | while (1) |
400fbf9f | 6064 | { |
de520661 | 6065 | if (TREE_CODE (constructor_type) == RECORD_TYPE) |
400fbf9f | 6066 | { |
de520661 RS |
6067 | tree fieldtype; |
6068 | enum tree_code fieldcode; | |
6069 | ||
6070 | if (constructor_fields == 0) | |
6071 | { | |
6072 | pedwarn_init ("excess elements in struct initializer%s", | |
6073 | " after `%s'", NULL_PTR); | |
6074 | break; | |
6075 | } | |
6076 | ||
6077 | fieldtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_fields)); | |
6078 | fieldcode = TREE_CODE (fieldtype); | |
6079 | ||
b62acd60 RS |
6080 | /* Accept a string constant to initialize a subarray. */ |
6081 | if (value != 0 | |
6082 | && fieldcode == ARRAY_TYPE | |
6083 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6084 | && string_flag) | |
6085 | value = orig_value; | |
6086 | /* Otherwise, if we have come to a subaggregate, | |
6087 | and we don't have an element of its type, push into it. */ | |
6088 | else if (value != 0 | |
6089 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype | |
6090 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6091 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6092 | { |
6093 | push_init_level (1); | |
6094 | continue; | |
6095 | } | |
6096 | ||
6097 | if (value) | |
6098 | { | |
6099 | push_member_name (IDENTIFIER_POINTER (DECL_NAME (constructor_fields))); | |
6100 | output_init_element (value, fieldtype, constructor_fields, 1); | |
6101 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6102 | } | |
6103 | else | |
b62acd60 RS |
6104 | /* Do the bookkeeping for an element that was |
6105 | directly output as a constructor. */ | |
6106 | { | |
6107 | /* For a record, keep track of end position of last field. */ | |
6108 | tree temp = size_binop (PLUS_EXPR, | |
6109 | DECL_FIELD_BITPOS (constructor_fields), | |
6110 | DECL_SIZE (constructor_fields)); | |
6111 | TREE_INT_CST_LOW (constructor_bit_index) | |
6112 | = TREE_INT_CST_LOW (temp); | |
6113 | TREE_INT_CST_HIGH (constructor_bit_index) | |
6114 | = TREE_INT_CST_HIGH (temp); | |
6115 | ||
6116 | constructor_unfilled_fields = TREE_CHAIN (constructor_fields); | |
6117 | } | |
de520661 RS |
6118 | |
6119 | constructor_fields = TREE_CHAIN (constructor_fields); | |
6120 | break; | |
400fbf9f | 6121 | } |
de520661 | 6122 | if (TREE_CODE (constructor_type) == UNION_TYPE) |
400fbf9f | 6123 | { |
de520661 RS |
6124 | tree fieldtype; |
6125 | enum tree_code fieldcode; | |
6126 | ||
6127 | if (constructor_fields == 0) | |
6128 | { | |
6129 | pedwarn_init ("excess elements in union initializer%s", | |
6130 | " after `%s'", NULL_PTR); | |
6131 | break; | |
6132 | } | |
6133 | ||
6134 | fieldtype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_fields)); | |
6135 | fieldcode = TREE_CODE (fieldtype); | |
6136 | ||
b62acd60 RS |
6137 | /* Accept a string constant to initialize a subarray. */ |
6138 | if (value != 0 | |
6139 | && fieldcode == ARRAY_TYPE | |
6140 | && TREE_CODE (TREE_TYPE (fieldtype)) == INTEGER_TYPE | |
6141 | && string_flag) | |
6142 | value = orig_value; | |
6143 | /* Otherwise, if we have come to a subaggregate, | |
6144 | and we don't have an element of its type, push into it. */ | |
6145 | else if (value != 0 | |
6146 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != fieldtype | |
6147 | && (fieldcode == RECORD_TYPE || fieldcode == ARRAY_TYPE | |
6148 | || fieldcode == UNION_TYPE)) | |
de520661 RS |
6149 | { |
6150 | push_init_level (1); | |
6151 | continue; | |
6152 | } | |
6153 | ||
6154 | if (value) | |
6155 | { | |
6156 | push_member_name (IDENTIFIER_POINTER (DECL_NAME (constructor_fields))); | |
6157 | output_init_element (value, fieldtype, constructor_fields, 1); | |
6158 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6159 | } | |
6160 | else | |
6161 | /* If we are doing the bookkeeping for an element that was | |
6162 | directly output as a constructor, | |
6163 | we must update constructor_unfilled_fields. */ | |
6164 | constructor_unfilled_fields = 0; | |
6165 | ||
6166 | constructor_fields = 0; | |
6167 | break; | |
400fbf9f | 6168 | } |
de520661 RS |
6169 | if (TREE_CODE (constructor_type) == ARRAY_TYPE) |
6170 | { | |
6171 | tree elttype = TYPE_MAIN_VARIANT (TREE_TYPE (constructor_type)); | |
6172 | enum tree_code eltcode = TREE_CODE (elttype); | |
6173 | ||
b62acd60 RS |
6174 | /* Accept a string constant to initialize a subarray. */ |
6175 | if (value != 0 | |
6176 | && eltcode == ARRAY_TYPE | |
6177 | && TREE_CODE (TREE_TYPE (elttype)) == INTEGER_TYPE | |
6178 | && string_flag) | |
6179 | value = orig_value; | |
6180 | /* Otherwise, if we have come to a subaggregate, | |
6181 | and we don't have an element of its type, push into it. */ | |
6182 | else if (value != 0 | |
6183 | && TYPE_MAIN_VARIANT (TREE_TYPE (value)) != elttype | |
6184 | && (eltcode == RECORD_TYPE || eltcode == ARRAY_TYPE | |
6185 | || eltcode == UNION_TYPE)) | |
de520661 RS |
6186 | { |
6187 | push_init_level (1); | |
6188 | continue; | |
6189 | } | |
6190 | ||
6191 | if (constructor_max_index != 0 | |
6192 | && tree_int_cst_lt (constructor_max_index, constructor_index)) | |
6193 | { | |
6194 | pedwarn_init ("excess elements in array initializer%s", | |
6195 | " after `%s'", NULL_PTR); | |
6196 | break; | |
6197 | } | |
400fbf9f | 6198 | |
de520661 RS |
6199 | /* Now output the actual element. |
6200 | Ordinarily, output once. | |
6201 | If there is a range, repeat it till we advance past the range. */ | |
6202 | do | |
6203 | { | |
6204 | tree tem; | |
d45cf215 | 6205 | |
de520661 RS |
6206 | if (value) |
6207 | { | |
6208 | push_array_bounds (TREE_INT_CST_LOW (constructor_index)); | |
6209 | output_init_element (value, elttype, constructor_index, 1); | |
6210 | RESTORE_SPELLING_DEPTH (constructor_depth); | |
6211 | } | |
d45cf215 | 6212 | |
de520661 RS |
6213 | tem = size_binop (PLUS_EXPR, constructor_index, |
6214 | integer_one_node); | |
6215 | TREE_INT_CST_LOW (constructor_index) | |
6216 | = TREE_INT_CST_LOW (tem); | |
6217 | TREE_INT_CST_HIGH (constructor_index) | |
6218 | = TREE_INT_CST_HIGH (tem); | |
6219 | ||
6220 | if (!value) | |
6221 | /* If we are doing the bookkeeping for an element that was | |
6222 | directly output as a constructor, | |
6223 | we must update constructor_unfilled_index. */ | |
6224 | { | |
6225 | TREE_INT_CST_LOW (constructor_unfilled_index) | |
6226 | = TREE_INT_CST_LOW (constructor_index); | |
6227 | TREE_INT_CST_HIGH (constructor_unfilled_index) | |
6228 | = TREE_INT_CST_HIGH (constructor_index); | |
6229 | } | |
6230 | } | |
6231 | while (! (constructor_range_end == 0 | |
6232 | || tree_int_cst_lt (constructor_range_end, | |
6233 | constructor_index))); | |
400fbf9f | 6234 | |
de520661 RS |
6235 | break; |
6236 | } | |
6237 | ||
6238 | /* Handle the sole element allowed in a braced initializer | |
6239 | for a scalar variable. */ | |
6240 | if (constructor_fields == 0) | |
6241 | { | |
6242 | pedwarn_init ("excess elements in scalar initializer%s", | |
6243 | " after `%s'", NULL_PTR); | |
6244 | break; | |
6245 | } | |
6246 | ||
6247 | if (value) | |
6248 | output_init_element (value, constructor_type, NULL_TREE, 1); | |
6249 | constructor_fields = 0; | |
6250 | break; | |
fe67cf58 | 6251 | } |
de520661 RS |
6252 | |
6253 | /* If the (lexically) previous elments are not now saved, | |
6254 | we can discard the storage for them. */ | |
6255 | if (constructor_incremental && constructor_pending_elts == 0) | |
6256 | clear_momentary (); | |
400fbf9f JW |
6257 | } |
6258 | \f | |
6259 | /* Expand an ASM statement with operands, handling output operands | |
6260 | that are not variables or INDIRECT_REFS by transforming such | |
6261 | cases into cases that expand_asm_operands can handle. | |
6262 | ||
6263 | Arguments are same as for expand_asm_operands. */ | |
6264 | ||
6265 | void | |
6266 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
6267 | tree string, outputs, inputs, clobbers; | |
6268 | int vol; | |
6269 | char *filename; | |
6270 | int line; | |
6271 | { | |
6272 | int noutputs = list_length (outputs); | |
6273 | register int i; | |
6274 | /* o[I] is the place that output number I should be written. */ | |
6275 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
6276 | register tree tail; | |
6277 | ||
6278 | if (TREE_CODE (string) == ADDR_EXPR) | |
6279 | string = TREE_OPERAND (string, 0); | |
6280 | if (TREE_CODE (string) != STRING_CST) | |
6281 | { | |
6282 | error ("asm template is not a string constant"); | |
6283 | return; | |
6284 | } | |
6285 | ||
7b6327ae | 6286 | /* Record the contents of OUTPUTS before it is modified. */ |
400fbf9f JW |
6287 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) |
6288 | o[i] = TREE_VALUE (tail); | |
6289 | ||
6290 | /* Perform default conversions on array and function inputs. */ | |
6291 | /* Don't do this for other types-- | |
6292 | it would screw up operands expected to be in memory. */ | |
6293 | for (i = 0, tail = inputs; tail; tail = TREE_CHAIN (tail), i++) | |
6294 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE | |
6295 | || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE) | |
6296 | TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail)); | |
6297 | ||
6298 | /* Generate the ASM_OPERANDS insn; | |
6299 | store into the TREE_VALUEs of OUTPUTS some trees for | |
6300 | where the values were actually stored. */ | |
6301 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
6302 | ||
6303 | /* Copy all the intermediate outputs into the specified outputs. */ | |
6304 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6305 | { | |
6306 | if (o[i] != TREE_VALUE (tail)) | |
6307 | { | |
6308 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
6309 | 0, VOIDmode, 0); | |
6310 | free_temp_slots (); | |
6311 | } | |
6312 | /* Detect modification of read-only values. | |
6313 | (Otherwise done by build_modify_expr.) */ | |
6314 | else | |
6315 | { | |
6316 | tree type = TREE_TYPE (o[i]); | |
6317 | if (TYPE_READONLY (type) | |
6318 | || ((TREE_CODE (type) == RECORD_TYPE | |
6319 | || TREE_CODE (type) == UNION_TYPE) | |
6320 | && C_TYPE_FIELDS_READONLY (type))) | |
6321 | readonly_warning (o[i], "modification by `asm'"); | |
6322 | } | |
6323 | } | |
6324 | ||
6325 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
6326 | emit_queue (); | |
6327 | } | |
6328 | \f | |
6329 | /* Expand a C `return' statement. | |
6330 | RETVAL is the expression for what to return, | |
6331 | or a null pointer for `return;' with no value. */ | |
6332 | ||
6333 | void | |
6334 | c_expand_return (retval) | |
6335 | tree retval; | |
6336 | { | |
6337 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
6338 | ||
6339 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
6340 | warning ("function declared `volatile' has a `return' statement"); | |
6341 | ||
6342 | if (!retval) | |
6343 | { | |
6344 | current_function_returns_null = 1; | |
6345 | if (warn_return_type && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
6346 | warning ("`return' with no value, in function returning non-void"); | |
6347 | expand_null_return (); | |
6348 | } | |
6349 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) | |
6350 | { | |
6351 | current_function_returns_null = 1; | |
6352 | if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
6353 | pedwarn ("`return' with a value, in function returning void"); | |
6354 | expand_return (retval); | |
6355 | } | |
6356 | else | |
6357 | { | |
6358 | tree t = convert_for_assignment (valtype, retval, "return", | |
9b7267b8 | 6359 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
6360 | tree res = DECL_RESULT (current_function_decl); |
6361 | t = build (MODIFY_EXPR, TREE_TYPE (res), | |
6362 | res, convert (TREE_TYPE (res), t)); | |
1c2a9b35 | 6363 | TREE_SIDE_EFFECTS (t) = 1; |
400fbf9f JW |
6364 | expand_return (t); |
6365 | current_function_returns_value = 1; | |
6366 | } | |
6367 | } | |
6368 | \f | |
6369 | /* Start a C switch statement, testing expression EXP. | |
6370 | Return EXP if it is valid, an error node otherwise. */ | |
6371 | ||
6372 | tree | |
6373 | c_expand_start_case (exp) | |
6374 | tree exp; | |
6375 | { | |
6376 | register enum tree_code code = TREE_CODE (TREE_TYPE (exp)); | |
6377 | tree type = TREE_TYPE (exp); | |
6378 | ||
6379 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
6380 | { | |
6381 | error ("switch quantity not an integer"); | |
6382 | exp = error_mark_node; | |
6383 | } | |
6384 | else | |
6385 | { | |
6386 | tree index; | |
6cb72a7d | 6387 | type = TYPE_MAIN_VARIANT (TREE_TYPE (exp)); |
400fbf9f JW |
6388 | |
6389 | if (warn_traditional | |
6cb72a7d RS |
6390 | && (type == long_integer_type_node |
6391 | || type == long_unsigned_type_node)) | |
400fbf9f JW |
6392 | pedwarn ("`long' switch expression not converted to `int' in ANSI C"); |
6393 | ||
6394 | exp = default_conversion (exp); | |
6395 | type = TREE_TYPE (exp); | |
8d9bfdc5 | 6396 | index = get_unwidened (exp, NULL_TREE); |
400fbf9f JW |
6397 | /* We can't strip a conversion from a signed type to an unsigned, |
6398 | because if we did, int_fits_type_p would do the wrong thing | |
6399 | when checking case values for being in range, | |
6400 | and it's too hard to do the right thing. */ | |
6401 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
6402 | == TREE_UNSIGNED (TREE_TYPE (index))) | |
6403 | exp = index; | |
6404 | } | |
6405 | ||
6406 | expand_start_case (1, exp, type, "switch statement"); | |
6407 | ||
6408 | return exp; | |
6409 | } |