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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 | ||
3845b542 MS |
36 | extern char *index (); |
37 | extern char *rindex (); | |
38 | ||
400fbf9f JW |
39 | int mark_addressable (); |
40 | static tree convert_for_assignment (); | |
41 | static void warn_for_assignment (); | |
42 | static int function_types_compatible_p (); | |
43 | static int type_lists_compatible_p (); | |
805f961c | 44 | int self_promoting_args_p (); |
400fbf9f JW |
45 | static int self_promoting_type_p (); |
46 | static int comp_target_types (); | |
47 | static tree pointer_int_sum (); | |
48 | static tree pointer_diff (); | |
49 | static tree convert_sequence (); | |
50 | static tree unary_complex_lvalue (); | |
51 | static tree process_init_constructor (); | |
52 | static tree convert_arguments (); | |
d45cf215 | 53 | static char *get_spelling (); |
400fbf9f JW |
54 | tree digest_init (); |
55 | static void pedantic_lvalue_warning (); | |
56 | tree truthvalue_conversion (); | |
57 | void incomplete_type_error (); | |
58 | void readonly_warning (); | |
82bde854 MM |
59 | static tree internal_build_compound_expr (); |
60 | ||
400fbf9f JW |
61 | \f |
62 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
63 | does not have an incomplete type. (That includes void types.) */ | |
64 | ||
65 | tree | |
66 | require_complete_type (value) | |
67 | tree value; | |
68 | { | |
69 | tree type = TREE_TYPE (value); | |
70 | ||
71 | /* First, detect a valid value with a complete type. */ | |
72 | if (TYPE_SIZE (type) != 0 | |
73 | && type != void_type_node) | |
74 | return value; | |
75 | ||
76 | incomplete_type_error (value, type); | |
77 | return error_mark_node; | |
78 | } | |
79 | ||
80 | /* Print an error message for invalid use of an incomplete type. | |
81 | VALUE is the expression that was used (or 0 if that isn't known) | |
82 | and TYPE is the type that was invalid. */ | |
83 | ||
84 | void | |
85 | incomplete_type_error (value, type) | |
86 | tree value; | |
87 | tree type; | |
88 | { | |
89 | char *errmsg; | |
90 | ||
91 | /* Avoid duplicate error message. */ | |
92 | if (TREE_CODE (type) == ERROR_MARK) | |
93 | return; | |
94 | ||
95 | if (value != 0 && (TREE_CODE (value) == VAR_DECL | |
96 | || TREE_CODE (value) == PARM_DECL)) | |
97 | error ("`%s' has an incomplete type", | |
98 | IDENTIFIER_POINTER (DECL_NAME (value))); | |
99 | else | |
100 | { | |
101 | retry: | |
102 | /* We must print an error message. Be clever about what it says. */ | |
103 | ||
104 | switch (TREE_CODE (type)) | |
105 | { | |
106 | case RECORD_TYPE: | |
107 | errmsg = "invalid use of undefined type `struct %s'"; | |
108 | break; | |
109 | ||
110 | case UNION_TYPE: | |
111 | errmsg = "invalid use of undefined type `union %s'"; | |
112 | break; | |
113 | ||
114 | case ENUMERAL_TYPE: | |
115 | errmsg = "invalid use of undefined type `enum %s'"; | |
116 | break; | |
117 | ||
118 | case VOID_TYPE: | |
119 | error ("invalid use of void expression"); | |
120 | return; | |
121 | ||
122 | case ARRAY_TYPE: | |
123 | if (TYPE_DOMAIN (type)) | |
124 | { | |
125 | type = TREE_TYPE (type); | |
126 | goto retry; | |
127 | } | |
128 | error ("invalid use of array with unspecified bounds"); | |
129 | return; | |
130 | ||
131 | default: | |
132 | abort (); | |
133 | } | |
134 | ||
135 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
136 | error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type))); | |
137 | else | |
138 | /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */ | |
139 | error ("invalid use of incomplete typedef `%s'", | |
140 | IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)))); | |
141 | } | |
142 | } | |
143 | ||
144 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
145 | as well as those of TYPE. */ | |
146 | ||
147 | static tree | |
148 | qualify_type (type, like) | |
149 | tree type, like; | |
150 | { | |
151 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
152 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
153 | return c_build_type_variant (type, constflag, volflag); | |
154 | } | |
155 | \f | |
156 | /* Return the common type of two types. | |
157 | We assume that comptypes has already been done and returned 1; | |
6cb72a7d RS |
158 | if that isn't so, this may crash. In particular, we assume that qualifiers |
159 | match. | |
400fbf9f JW |
160 | |
161 | This is the type for the result of most arithmetic operations | |
6cb72a7d | 162 | if the operands have the given two types. */ |
400fbf9f JW |
163 | |
164 | tree | |
165 | common_type (t1, t2) | |
166 | tree t1, t2; | |
167 | { | |
168 | register enum tree_code code1; | |
169 | register enum tree_code code2; | |
170 | ||
171 | /* Save time if the two types are the same. */ | |
172 | ||
173 | if (t1 == t2) return t1; | |
174 | ||
175 | /* If one type is nonsense, use the other. */ | |
176 | if (t1 == error_mark_node) | |
177 | return t2; | |
178 | if (t2 == error_mark_node) | |
179 | return t1; | |
180 | ||
181 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
182 | ||
183 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
184 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
185 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
186 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
187 | ||
188 | code1 = TREE_CODE (t1); | |
189 | code2 = TREE_CODE (t2); | |
190 | ||
b6a10c9f RS |
191 | /* If one type is complex, form the common type |
192 | of the non-complex components, | |
193 | then make that complex. */ | |
194 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
195 | { | |
196 | tree subtype1, subtype2, subtype; | |
197 | if (code1 == COMPLEX_TYPE) | |
198 | subtype1 = TREE_TYPE (t1); | |
199 | else | |
200 | subtype1 = t1; | |
201 | if (code2 == COMPLEX_TYPE) | |
202 | subtype2 = TREE_TYPE (t2); | |
203 | else | |
204 | subtype2 = t2; | |
205 | subtype = common_type (subtype1, subtype2); | |
206 | return build_complex_type (subtype); | |
207 | } | |
208 | ||
400fbf9f JW |
209 | switch (code1) |
210 | { | |
211 | case INTEGER_TYPE: | |
212 | case REAL_TYPE: | |
213 | /* If only one is real, use it as the result. */ | |
214 | ||
215 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
216 | return t1; | |
217 | ||
218 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
219 | return t2; | |
220 | ||
221 | /* Both real or both integers; use the one with greater precision. */ | |
222 | ||
223 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
224 | return t1; | |
225 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) | |
226 | return t2; | |
227 | ||
228 | /* Same precision. Prefer longs to ints even when same size. */ | |
229 | ||
230 | if (t1 == long_unsigned_type_node | |
231 | || t2 == long_unsigned_type_node) | |
232 | return long_unsigned_type_node; | |
233 | ||
234 | if (t1 == long_integer_type_node | |
235 | || t2 == long_integer_type_node) | |
236 | { | |
237 | /* But preserve unsignedness from the other type, | |
238 | since long cannot hold all the values of an unsigned int. */ | |
239 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
240 | return long_unsigned_type_node; | |
241 | return long_integer_type_node; | |
242 | } | |
243 | ||
244 | /* Otherwise prefer the unsigned one. */ | |
245 | ||
246 | if (TREE_UNSIGNED (t1)) | |
247 | return t1; | |
248 | else return t2; | |
249 | ||
250 | case POINTER_TYPE: | |
400fbf9f JW |
251 | /* For two pointers, do this recursively on the target type, |
252 | and combine the qualifiers of the two types' targets. */ | |
8706edbc RS |
253 | /* This code was turned off; I don't know why. |
254 | But ANSI C specifies doing this with the qualifiers. | |
255 | So I turned it on again. */ | |
400fbf9f JW |
256 | { |
257 | tree target = common_type (TYPE_MAIN_VARIANT (TREE_TYPE (t1)), | |
258 | TYPE_MAIN_VARIANT (TREE_TYPE (t2))); | |
259 | int constp | |
260 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
261 | int volatilep | |
262 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
263 | return build_pointer_type (c_build_type_variant (target, constp, volatilep)); | |
264 | } | |
8706edbc | 265 | #if 0 |
400fbf9f | 266 | return build_pointer_type (common_type (TREE_TYPE (t1), TREE_TYPE (t2))); |
8706edbc | 267 | #endif |
400fbf9f JW |
268 | |
269 | case ARRAY_TYPE: | |
270 | { | |
271 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
272 | /* Save space: see if the result is identical to one of the args. */ | |
273 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
274 | return t1; | |
275 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) | |
276 | return t2; | |
277 | /* Merge the element types, and have a size if either arg has one. */ | |
278 | return build_array_type (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); | |
279 | } | |
280 | ||
281 | case FUNCTION_TYPE: | |
282 | /* Function types: prefer the one that specified arg types. | |
283 | If both do, merge the arg types. Also merge the return types. */ | |
284 | { | |
285 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
286 | tree p1 = TYPE_ARG_TYPES (t1); | |
287 | tree p2 = TYPE_ARG_TYPES (t2); | |
288 | int len; | |
289 | tree newargs, n; | |
290 | int i; | |
291 | ||
292 | /* Save space: see if the result is identical to one of the args. */ | |
293 | if (valtype == TREE_TYPE (t1) && ! TYPE_ARG_TYPES (t2)) | |
294 | return t1; | |
295 | if (valtype == TREE_TYPE (t2) && ! TYPE_ARG_TYPES (t1)) | |
296 | return t2; | |
297 | ||
298 | /* Simple way if one arg fails to specify argument types. */ | |
299 | if (TYPE_ARG_TYPES (t1) == 0) | |
300 | return build_function_type (valtype, TYPE_ARG_TYPES (t2)); | |
301 | if (TYPE_ARG_TYPES (t2) == 0) | |
302 | return build_function_type (valtype, TYPE_ARG_TYPES (t1)); | |
303 | ||
304 | /* If both args specify argument types, we must merge the two | |
305 | lists, argument by argument. */ | |
306 | ||
307 | len = list_length (p1); | |
308 | newargs = 0; | |
309 | ||
310 | for (i = 0; i < len; i++) | |
8d9bfdc5 | 311 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); |
400fbf9f JW |
312 | |
313 | n = newargs; | |
314 | ||
315 | for (; p1; | |
316 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n)) | |
317 | { | |
318 | /* A null type means arg type is not specified. | |
319 | Take whatever the other function type has. */ | |
320 | if (TREE_VALUE (p1) == 0) | |
321 | { | |
322 | TREE_VALUE (n) = TREE_VALUE (p2); | |
323 | goto parm_done; | |
324 | } | |
325 | if (TREE_VALUE (p2) == 0) | |
326 | { | |
327 | TREE_VALUE (n) = TREE_VALUE (p1); | |
328 | goto parm_done; | |
329 | } | |
330 | ||
331 | /* Given wait (union {union wait *u; int *i} *) | |
332 | and wait (union wait *), | |
333 | prefer union wait * as type of parm. */ | |
334 | if (TREE_CODE (TREE_VALUE (p1)) == UNION_TYPE | |
335 | && TREE_VALUE (p1) != TREE_VALUE (p2)) | |
336 | { | |
337 | tree memb; | |
338 | for (memb = TYPE_FIELDS (TREE_VALUE (p1)); | |
339 | memb; memb = TREE_CHAIN (memb)) | |
340 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p2))) | |
341 | { | |
342 | TREE_VALUE (n) = TREE_VALUE (p2); | |
343 | if (pedantic) | |
344 | pedwarn ("function types not truly compatible in ANSI C"); | |
345 | goto parm_done; | |
346 | } | |
347 | } | |
348 | if (TREE_CODE (TREE_VALUE (p2)) == UNION_TYPE | |
349 | && TREE_VALUE (p2) != TREE_VALUE (p1)) | |
350 | { | |
351 | tree memb; | |
352 | for (memb = TYPE_FIELDS (TREE_VALUE (p2)); | |
353 | memb; memb = TREE_CHAIN (memb)) | |
354 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (p1))) | |
355 | { | |
356 | TREE_VALUE (n) = TREE_VALUE (p1); | |
357 | if (pedantic) | |
358 | pedwarn ("function types not truly compatible in ANSI C"); | |
359 | goto parm_done; | |
360 | } | |
361 | } | |
362 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
363 | parm_done: ; | |
364 | } | |
365 | ||
366 | return build_function_type (valtype, newargs); | |
367 | } | |
368 | ||
369 | default: | |
370 | return t1; | |
371 | } | |
372 | ||
373 | } | |
374 | \f | |
375 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
376 | or various other operations. Return 2 if they are compatible | |
377 | but a warning may be needed if you use them together. */ | |
378 | ||
379 | int | |
380 | comptypes (type1, type2) | |
381 | tree type1, type2; | |
382 | { | |
383 | register tree t1 = type1; | |
384 | register tree t2 = type2; | |
385 | ||
386 | /* Suppress errors caused by previously reported errors. */ | |
387 | ||
388 | if (t1 == t2 || TREE_CODE (t1) == ERROR_MARK || TREE_CODE (t2) == ERROR_MARK) | |
389 | return 1; | |
390 | ||
391 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
392 | ||
393 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
394 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
395 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
396 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
397 | ||
398 | if (t1 == t2) | |
399 | return 1; | |
400 | ||
401 | /* Different classes of types can't be compatible. */ | |
402 | ||
403 | if (TREE_CODE (t1) != TREE_CODE (t2)) return 0; | |
404 | ||
405 | /* Qualifiers must match. */ | |
406 | ||
407 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
408 | return 0; | |
409 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) | |
410 | return 0; | |
411 | ||
d45cf215 | 412 | /* If generating auxiliary info, allow for two different type nodes which |
400fbf9f JW |
413 | have essentially the same definition. */ |
414 | ||
415 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
416 | return 1; | |
417 | ||
418 | switch (TREE_CODE (t1)) | |
419 | { | |
420 | case POINTER_TYPE: | |
421 | return (TREE_TYPE (t1) == TREE_TYPE (t2) | |
422 | ? 1 : comptypes (TREE_TYPE (t1), TREE_TYPE (t2))); | |
423 | ||
424 | case FUNCTION_TYPE: | |
425 | return function_types_compatible_p (t1, t2); | |
426 | ||
427 | case ARRAY_TYPE: | |
428 | { | |
429 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
430 | int val = 1; | |
431 | tree d1 = TYPE_DOMAIN (t1); | |
432 | tree d2 = TYPE_DOMAIN (t2); | |
433 | ||
434 | /* Target types must match incl. qualifiers. */ | |
435 | if (TREE_TYPE (t1) != TREE_TYPE (t2) | |
436 | && 0 == (val = comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))) | |
437 | return 0; | |
438 | ||
439 | /* Sizes must match unless one is missing or variable. */ | |
440 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
441 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
442 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
443 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
444 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
445 | return val; | |
446 | ||
447 | return (((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) | |
448 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) | |
449 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
450 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
451 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
452 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
453 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
454 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))) | |
455 | ? val : 0); | |
456 | } | |
457 | ||
458 | case RECORD_TYPE: | |
459 | return maybe_objc_comptypes (t1, t2); | |
460 | } | |
461 | return 0; | |
462 | } | |
463 | ||
464 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
465 | ignoring their qualifiers. */ | |
466 | ||
467 | static int | |
468 | comp_target_types (ttl, ttr) | |
469 | tree ttl, ttr; | |
470 | { | |
471 | int val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)), | |
472 | TYPE_MAIN_VARIANT (TREE_TYPE (ttr))); | |
473 | if (val == 2 && pedantic) | |
474 | pedwarn ("types are not quite compatible"); | |
475 | return val; | |
476 | } | |
477 | \f | |
478 | /* Subroutines of `comptypes'. */ | |
479 | ||
480 | /* Return 1 if two function types F1 and F2 are compatible. | |
481 | If either type specifies no argument types, | |
482 | the other must specify a fixed number of self-promoting arg types. | |
483 | Otherwise, if one type specifies only the number of arguments, | |
484 | the other must specify that number of self-promoting arg types. | |
485 | Otherwise, the argument types must match. */ | |
486 | ||
487 | static int | |
488 | function_types_compatible_p (f1, f2) | |
489 | tree f1, f2; | |
490 | { | |
491 | tree args1, args2; | |
492 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
493 | int val = 1; | |
494 | int val1; | |
495 | ||
496 | if (!(TREE_TYPE (f1) == TREE_TYPE (f2) | |
497 | || (val = comptypes (TREE_TYPE (f1), TREE_TYPE (f2))))) | |
498 | return 0; | |
499 | ||
500 | args1 = TYPE_ARG_TYPES (f1); | |
501 | args2 = TYPE_ARG_TYPES (f2); | |
502 | ||
503 | /* An unspecified parmlist matches any specified parmlist | |
504 | whose argument types don't need default promotions. */ | |
505 | ||
506 | if (args1 == 0) | |
507 | { | |
508 | if (!self_promoting_args_p (args2)) | |
509 | return 0; | |
510 | /* If one of these types comes from a non-prototype fn definition, | |
511 | compare that with the other type's arglist. | |
512 | If they don't match, ask for a warning (but no error). */ | |
513 | if (TYPE_ACTUAL_ARG_TYPES (f1) | |
514 | && 1 != type_lists_compatible_p (args2, TYPE_ACTUAL_ARG_TYPES (f1))) | |
515 | val = 2; | |
516 | return val; | |
517 | } | |
518 | if (args2 == 0) | |
519 | { | |
520 | if (!self_promoting_args_p (args1)) | |
521 | return 0; | |
522 | if (TYPE_ACTUAL_ARG_TYPES (f2) | |
523 | && 1 != type_lists_compatible_p (args1, TYPE_ACTUAL_ARG_TYPES (f2))) | |
524 | val = 2; | |
525 | return val; | |
526 | } | |
527 | ||
528 | /* Both types have argument lists: compare them and propagate results. */ | |
529 | val1 = type_lists_compatible_p (args1, args2); | |
530 | return val1 != 1 ? val1 : val; | |
531 | } | |
532 | ||
533 | /* Check two lists of types for compatibility, | |
534 | returning 0 for incompatible, 1 for compatible, | |
535 | or 2 for compatible with warning. */ | |
536 | ||
537 | static int | |
538 | type_lists_compatible_p (args1, args2) | |
539 | tree args1, args2; | |
540 | { | |
541 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
542 | int val = 1; | |
543 | int newval; | |
544 | ||
545 | while (1) | |
546 | { | |
547 | if (args1 == 0 && args2 == 0) | |
548 | return val; | |
549 | /* If one list is shorter than the other, | |
550 | they fail to match. */ | |
551 | if (args1 == 0 || args2 == 0) | |
552 | return 0; | |
553 | /* A null pointer instead of a type | |
554 | means there is supposed to be an argument | |
555 | but nothing is specified about what type it has. | |
556 | So match anything that self-promotes. */ | |
557 | if (TREE_VALUE (args1) == 0) | |
558 | { | |
559 | if (! self_promoting_type_p (TREE_VALUE (args2))) | |
560 | return 0; | |
561 | } | |
562 | else if (TREE_VALUE (args2) == 0) | |
563 | { | |
564 | if (! self_promoting_type_p (TREE_VALUE (args1))) | |
565 | return 0; | |
566 | } | |
567 | else if (! (newval = comptypes (TREE_VALUE (args1), TREE_VALUE (args2)))) | |
568 | { | |
569 | /* Allow wait (union {union wait *u; int *i} *) | |
570 | and wait (union wait *) to be compatible. */ | |
571 | if (TREE_CODE (TREE_VALUE (args1)) == UNION_TYPE | |
572 | && TYPE_NAME (TREE_VALUE (args1)) == 0 | |
573 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args1))) == INTEGER_CST | |
574 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args1)), | |
575 | TYPE_SIZE (TREE_VALUE (args2)))) | |
576 | { | |
577 | tree memb; | |
578 | for (memb = TYPE_FIELDS (TREE_VALUE (args1)); | |
579 | memb; memb = TREE_CHAIN (memb)) | |
580 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args2))) | |
581 | break; | |
582 | if (memb == 0) | |
583 | return 0; | |
584 | } | |
585 | else if (TREE_CODE (TREE_VALUE (args2)) == UNION_TYPE | |
586 | && TYPE_NAME (TREE_VALUE (args2)) == 0 | |
587 | && TREE_CODE (TYPE_SIZE (TREE_VALUE (args2))) == INTEGER_CST | |
588 | && tree_int_cst_equal (TYPE_SIZE (TREE_VALUE (args2)), | |
589 | TYPE_SIZE (TREE_VALUE (args1)))) | |
590 | { | |
591 | tree memb; | |
592 | for (memb = TYPE_FIELDS (TREE_VALUE (args2)); | |
593 | memb; memb = TREE_CHAIN (memb)) | |
594 | if (comptypes (TREE_TYPE (memb), TREE_VALUE (args1))) | |
595 | break; | |
596 | if (memb == 0) | |
597 | return 0; | |
598 | } | |
599 | else | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* comptypes said ok, but record if it said to warn. */ | |
604 | if (newval > val) | |
605 | val = newval; | |
606 | ||
607 | args1 = TREE_CHAIN (args1); | |
608 | args2 = TREE_CHAIN (args2); | |
609 | } | |
610 | } | |
611 | ||
612 | /* Return 1 if PARMS specifies a fixed number of parameters | |
613 | and none of their types is affected by default promotions. */ | |
614 | ||
805f961c | 615 | int |
400fbf9f JW |
616 | self_promoting_args_p (parms) |
617 | tree parms; | |
618 | { | |
619 | register tree t; | |
620 | for (t = parms; t; t = TREE_CHAIN (t)) | |
621 | { | |
622 | register tree type = TREE_VALUE (t); | |
623 | ||
624 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
625 | return 0; | |
626 | ||
d627ed1b RS |
627 | if (type == 0) |
628 | return 0; | |
629 | ||
6cb72a7d | 630 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
631 | return 0; |
632 | ||
d627ed1b | 633 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
634 | return 0; |
635 | } | |
636 | return 1; | |
637 | } | |
638 | ||
639 | /* Return 1 if TYPE is not affected by default promotions. */ | |
640 | ||
641 | static int | |
642 | self_promoting_type_p (type) | |
643 | tree type; | |
644 | { | |
6cb72a7d | 645 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
646 | return 0; |
647 | ||
d627ed1b | 648 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f JW |
649 | return 0; |
650 | ||
651 | return 1; | |
652 | } | |
653 | \f | |
654 | /* Return an unsigned type the same as TYPE in other respects. */ | |
655 | ||
656 | tree | |
657 | unsigned_type (type) | |
658 | tree type; | |
659 | { | |
6cb72a7d RS |
660 | tree type1 = TYPE_MAIN_VARIANT (type); |
661 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
400fbf9f | 662 | return unsigned_char_type_node; |
6cb72a7d | 663 | if (type1 == integer_type_node) |
400fbf9f | 664 | return unsigned_type_node; |
6cb72a7d | 665 | if (type1 == short_integer_type_node) |
400fbf9f | 666 | return short_unsigned_type_node; |
6cb72a7d | 667 | if (type1 == long_integer_type_node) |
400fbf9f | 668 | return long_unsigned_type_node; |
6cb72a7d | 669 | if (type1 == long_long_integer_type_node) |
400fbf9f JW |
670 | return long_long_unsigned_type_node; |
671 | return type; | |
672 | } | |
673 | ||
674 | /* Return a signed type the same as TYPE in other respects. */ | |
675 | ||
676 | tree | |
677 | signed_type (type) | |
678 | tree type; | |
679 | { | |
6cb72a7d RS |
680 | tree type1 = TYPE_MAIN_VARIANT (type); |
681 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
400fbf9f | 682 | return signed_char_type_node; |
6cb72a7d | 683 | if (type1 == unsigned_type_node) |
400fbf9f | 684 | return integer_type_node; |
6cb72a7d | 685 | if (type1 == short_unsigned_type_node) |
400fbf9f | 686 | return short_integer_type_node; |
6cb72a7d | 687 | if (type1 == long_unsigned_type_node) |
400fbf9f | 688 | return long_integer_type_node; |
6cb72a7d | 689 | if (type1 == long_long_unsigned_type_node) |
400fbf9f JW |
690 | return long_long_integer_type_node; |
691 | return type; | |
692 | } | |
693 | ||
694 | /* Return a type the same as TYPE except unsigned or | |
695 | signed according to UNSIGNEDP. */ | |
696 | ||
697 | tree | |
698 | signed_or_unsigned_type (unsignedp, type) | |
699 | int unsignedp; | |
700 | tree type; | |
701 | { | |
702 | if (TREE_CODE (type) != INTEGER_TYPE) | |
703 | return type; | |
704 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) | |
705 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
706 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
707 | return unsignedp ? unsigned_type_node : integer_type_node; | |
708 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
709 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
710 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
711 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
712 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
713 | return (unsignedp ? long_long_unsigned_type_node | |
714 | : long_long_integer_type_node); | |
715 | return type; | |
716 | } | |
717 | ||
718 | /* Compute the value of the `sizeof' operator. */ | |
719 | ||
720 | tree | |
721 | c_sizeof (type) | |
722 | tree type; | |
723 | { | |
724 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 725 | tree t; |
400fbf9f JW |
726 | |
727 | if (code == FUNCTION_TYPE) | |
728 | { | |
729 | if (pedantic || warn_pointer_arith) | |
730 | pedwarn ("sizeof applied to a function type"); | |
731 | return size_int (1); | |
732 | } | |
733 | if (code == VOID_TYPE) | |
734 | { | |
735 | if (pedantic || warn_pointer_arith) | |
736 | pedwarn ("sizeof applied to a void type"); | |
737 | return size_int (1); | |
738 | } | |
739 | if (code == ERROR_MARK) | |
740 | return size_int (1); | |
741 | if (TYPE_SIZE (type) == 0) | |
742 | { | |
743 | error ("sizeof applied to an incomplete type"); | |
744 | return size_int (0); | |
745 | } | |
746 | ||
747 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
748 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
749 | size_int (TYPE_PRECISION (char_type_node))); | |
fa427131 RS |
750 | /* size_binop does not put the constant in range, so do it now. */ |
751 | if (TREE_CODE (t) == INTEGER_CST) | |
e58cd767 | 752 | TREE_CONSTANT_OVERFLOW (t) |= force_fit_type (t, 0); |
f7c8fb3f | 753 | return t; |
400fbf9f JW |
754 | } |
755 | ||
756 | tree | |
757 | c_sizeof_nowarn (type) | |
758 | tree type; | |
759 | { | |
760 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 761 | tree t; |
400fbf9f JW |
762 | |
763 | if (code == FUNCTION_TYPE | |
764 | || code == VOID_TYPE | |
765 | || code == ERROR_MARK) | |
766 | return size_int (1); | |
767 | if (TYPE_SIZE (type) == 0) | |
768 | return size_int (0); | |
769 | ||
770 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f RS |
771 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
772 | size_int (TYPE_PRECISION (char_type_node))); | |
e58cd767 | 773 | force_fit_type (t, 0); |
f7c8fb3f | 774 | return t; |
400fbf9f JW |
775 | } |
776 | ||
777 | /* Compute the size to increment a pointer by. */ | |
778 | ||
779 | tree | |
780 | c_size_in_bytes (type) | |
781 | tree type; | |
782 | { | |
783 | enum tree_code code = TREE_CODE (type); | |
f7c8fb3f | 784 | tree t; |
400fbf9f JW |
785 | |
786 | if (code == FUNCTION_TYPE) | |
787 | return size_int (1); | |
788 | if (code == VOID_TYPE) | |
789 | return size_int (1); | |
790 | if (code == ERROR_MARK) | |
791 | return size_int (1); | |
792 | if (TYPE_SIZE (type) == 0) | |
793 | { | |
794 | error ("arithmetic on pointer to an incomplete type"); | |
795 | return size_int (1); | |
796 | } | |
797 | ||
798 | /* Convert in case a char is more than one unit. */ | |
f7c8fb3f | 799 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), |
400fbf9f | 800 | size_int (BITS_PER_UNIT)); |
e58cd767 | 801 | force_fit_type (t, 0); |
f7c8fb3f | 802 | return t; |
400fbf9f JW |
803 | } |
804 | ||
805 | /* Implement the __alignof keyword: Return the minimum required | |
806 | alignment of TYPE, measured in bytes. */ | |
807 | ||
808 | tree | |
809 | c_alignof (type) | |
810 | tree type; | |
811 | { | |
812 | enum tree_code code = TREE_CODE (type); | |
813 | ||
814 | if (code == FUNCTION_TYPE) | |
815 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
816 | ||
817 | if (code == VOID_TYPE || code == ERROR_MARK) | |
818 | return size_int (1); | |
819 | ||
820 | return size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
821 | } | |
822 | \f | |
823 | /* Implement the __alignof keyword: Return the minimum required | |
824 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
825 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
826 | "aligned" __attribute__ specification). */ | |
9e9bd45d | 827 | |
400fbf9f JW |
828 | tree |
829 | c_alignof_expr (expr) | |
830 | tree expr; | |
831 | { | |
832 | if (TREE_CODE (expr) == VAR_DECL) | |
833 | return size_int (DECL_ALIGN (expr) / BITS_PER_UNIT); | |
834 | ||
835 | if (TREE_CODE (expr) == COMPONENT_REF | |
836 | && DECL_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
837 | { | |
838 | error ("`__alignof' applied to a bit-field"); | |
839 | return size_int (1); | |
840 | } | |
841 | else if (TREE_CODE (expr) == COMPONENT_REF | |
842 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) | |
843 | return size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT); | |
844 | ||
845 | if (TREE_CODE (expr) == INDIRECT_REF) | |
846 | { | |
847 | tree t = TREE_OPERAND (expr, 0); | |
848 | tree best = t; | |
849 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
850 | ||
851 | while (TREE_CODE (t) == NOP_EXPR | |
852 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) | |
853 | { | |
854 | int thisalign; | |
855 | ||
856 | t = TREE_OPERAND (t, 0); | |
857 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
858 | if (thisalign > bestalign) | |
859 | best = t, bestalign = thisalign; | |
860 | } | |
861 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
862 | } | |
863 | else | |
864 | return c_alignof (TREE_TYPE (expr)); | |
865 | } | |
866 | /* Return either DECL or its known constant value (if it has one). */ | |
867 | ||
868 | static tree | |
869 | decl_constant_value (decl) | |
870 | tree decl; | |
871 | { | |
872 | if (! TREE_PUBLIC (decl) | |
873 | /* Don't change a variable array bound or initial value to a constant | |
874 | in a place where a variable is invalid. */ | |
875 | && current_function_decl != 0 | |
876 | && ! pedantic | |
877 | && ! TREE_THIS_VOLATILE (decl) | |
878 | && DECL_INITIAL (decl) != 0 | |
879 | && TREE_CODE (DECL_INITIAL (decl)) != ERROR_MARK | |
880 | /* This is invalid if initial value is not constant. | |
881 | If it has either a function call, a memory reference, | |
882 | or a variable, then re-evaluating it could give different results. */ | |
883 | && TREE_CONSTANT (DECL_INITIAL (decl)) | |
884 | /* Check for cases where this is sub-optimal, even though valid. */ | |
885 | && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR | |
886 | && DECL_MODE (decl) != BLKmode) | |
887 | return DECL_INITIAL (decl); | |
888 | return decl; | |
889 | } | |
890 | ||
891 | /* Perform default promotions for C data used in expressions. | |
892 | Arrays and functions are converted to pointers; | |
893 | enumeral types or short or char, to int. | |
894 | In addition, manifest constants symbols are replaced by their values. */ | |
895 | ||
896 | tree | |
897 | default_conversion (exp) | |
898 | tree exp; | |
899 | { | |
900 | register tree type = TREE_TYPE (exp); | |
901 | register enum tree_code code = TREE_CODE (type); | |
902 | ||
903 | /* Constants can be used directly unless they're not loadable. */ | |
904 | if (TREE_CODE (exp) == CONST_DECL) | |
905 | exp = DECL_INITIAL (exp); | |
906 | /* Replace a nonvolatile const static variable with its value. */ | |
907 | else if (optimize | |
908 | && TREE_CODE (exp) == VAR_DECL | |
909 | && TREE_READONLY (exp) | |
910 | && DECL_MODE (exp) != BLKmode) | |
911 | { | |
912 | exp = decl_constant_value (exp); | |
913 | type = TREE_TYPE (exp); | |
914 | } | |
915 | ||
a7d53fce RS |
916 | /* Strip NON_LVALUE_EXPRs and no-op conversions, since we aren't using as |
917 | an lvalue. */ | |
918 | /* Do not use STRIP_NOPS here! It will remove conversions from pointer | |
919 | to integer and cause infinite recursion. */ | |
920 | while (TREE_CODE (exp) == NON_LVALUE_EXPR | |
921 | || (TREE_CODE (exp) == NOP_EXPR | |
922 | && TREE_TYPE (TREE_OPERAND (exp, 0)) == TREE_TYPE (exp))) | |
923 | exp = TREE_OPERAND (exp, 0); | |
400fbf9f JW |
924 | |
925 | /* Normally convert enums to int, | |
926 | but convert wide enums to something wider. */ | |
927 | if (code == ENUMERAL_TYPE) | |
928 | { | |
929 | type = type_for_size (MAX (TYPE_PRECISION (type), | |
930 | TYPE_PRECISION (integer_type_node)), | |
931 | (flag_traditional && TREE_UNSIGNED (type))); | |
932 | return convert (type, exp); | |
933 | } | |
934 | ||
d627ed1b | 935 | if (C_PROMOTING_INTEGER_TYPE_P (type)) |
400fbf9f | 936 | { |
e83d45c4 RS |
937 | /* Traditionally, unsignedness is preserved in default promotions. |
938 | Also preserve unsignedness if not really getting any wider. */ | |
939 | if (TREE_UNSIGNED (type) | |
940 | && (flag_traditional | |
941 | || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))) | |
400fbf9f JW |
942 | return convert (unsigned_type_node, exp); |
943 | return convert (integer_type_node, exp); | |
944 | } | |
6cb72a7d | 945 | if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node) |
400fbf9f JW |
946 | return convert (double_type_node, exp); |
947 | if (code == VOID_TYPE) | |
948 | { | |
949 | error ("void value not ignored as it ought to be"); | |
950 | return error_mark_node; | |
951 | } | |
952 | if (code == FUNCTION_TYPE) | |
953 | { | |
954 | return build_unary_op (ADDR_EXPR, exp, 0); | |
955 | } | |
956 | if (code == ARRAY_TYPE) | |
957 | { | |
958 | register tree adr; | |
959 | tree restype = TREE_TYPE (type); | |
960 | tree ptrtype; | |
961 | ||
962 | if (TREE_CODE (exp) == INDIRECT_REF) | |
963 | return convert (TYPE_POINTER_TO (restype), | |
964 | TREE_OPERAND (exp, 0)); | |
965 | ||
966 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
967 | { | |
968 | tree op1 = default_conversion (TREE_OPERAND (exp, 1)); | |
969 | return build (COMPOUND_EXPR, TREE_TYPE (op1), | |
970 | TREE_OPERAND (exp, 0), op1); | |
971 | } | |
972 | ||
973 | if (!lvalue_p (exp) | |
974 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) | |
975 | { | |
976 | error ("invalid use of non-lvalue array"); | |
977 | return error_mark_node; | |
978 | } | |
979 | ||
980 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type)) | |
981 | restype = c_build_type_variant (restype, TYPE_READONLY (type), | |
982 | TYPE_VOLATILE (type)); | |
983 | ||
984 | ptrtype = build_pointer_type (restype); | |
985 | ||
986 | if (TREE_CODE (exp) == VAR_DECL) | |
987 | { | |
988 | /* ??? This is not really quite correct | |
989 | in that the type of the operand of ADDR_EXPR | |
990 | is not the target type of the type of the ADDR_EXPR itself. | |
991 | Question is, can this lossage be avoided? */ | |
992 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
993 | if (mark_addressable (exp) == 0) | |
994 | return error_mark_node; | |
995 | TREE_CONSTANT (adr) = staticp (exp); | |
996 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
997 | return adr; | |
998 | } | |
999 | /* This way is better for a COMPONENT_REF since it can | |
1000 | simplify the offset for a component. */ | |
1001 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1002 | return convert (ptrtype, adr); | |
1003 | } | |
1004 | return exp; | |
1005 | } | |
1006 | \f | |
1007 | /* Make an expression to refer to the COMPONENT field of | |
1008 | structure or union value DATUM. COMPONENT is an IDENTIFIER_NODE. */ | |
1009 | ||
1010 | tree | |
1011 | build_component_ref (datum, component) | |
1012 | tree datum, component; | |
1013 | { | |
1014 | register tree type = TREE_TYPE (datum); | |
1015 | register enum tree_code code = TREE_CODE (type); | |
1016 | register tree field = NULL; | |
1017 | register tree ref; | |
1018 | ||
1019 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it | |
1020 | unless we are not to support things not strictly ANSI. */ | |
1021 | switch (TREE_CODE (datum)) | |
1022 | { | |
1023 | case COMPOUND_EXPR: | |
1024 | { | |
1025 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component); | |
400fbf9f JW |
1026 | return build (COMPOUND_EXPR, TREE_TYPE (value), |
1027 | TREE_OPERAND (datum, 0), value); | |
1028 | } | |
1029 | case COND_EXPR: | |
400fbf9f JW |
1030 | return build_conditional_expr |
1031 | (TREE_OPERAND (datum, 0), | |
1032 | build_component_ref (TREE_OPERAND (datum, 1), component), | |
1033 | build_component_ref (TREE_OPERAND (datum, 2), component)); | |
1034 | } | |
1035 | ||
1036 | /* See if there is a field or component with name COMPONENT. */ | |
1037 | ||
1038 | if (code == RECORD_TYPE || code == UNION_TYPE) | |
1039 | { | |
1040 | if (TYPE_SIZE (type) == 0) | |
1041 | { | |
8d9bfdc5 | 1042 | incomplete_type_error (NULL_TREE, type); |
400fbf9f JW |
1043 | return error_mark_node; |
1044 | } | |
1045 | ||
1046 | /* Look up component name in the structure type definition. | |
1047 | ||
1048 | If TYPE_LANG_SPECIFIC is set, then it is a sorted array of pointers | |
1049 | to the field elements. Use a binary search on this array to quickly | |
1050 | find the element. Otherwise, do a linear search. TYPE_LANG_SPECIFIC | |
1051 | will always be set for structures which have many elements. */ | |
1052 | ||
1053 | if (TYPE_LANG_SPECIFIC (type)) | |
1054 | { | |
1055 | int bot, top, half; | |
1056 | tree *field_array = &TYPE_LANG_SPECIFIC (type)->elts[0]; | |
1057 | ||
1058 | field = TYPE_FIELDS (type); | |
1059 | bot = 0; | |
1060 | top = TYPE_LANG_SPECIFIC (type)->len; | |
1061 | while (top - bot > 1) | |
1062 | { | |
1063 | int cmp; | |
1064 | ||
1065 | half = (top - bot + 1) >> 1; | |
1066 | field = field_array[bot+half]; | |
1067 | cmp = (long)DECL_NAME (field) - (long)component; | |
1068 | if (cmp == 0) | |
1069 | break; | |
1070 | if (cmp < 0) | |
1071 | bot += half; | |
1072 | else | |
1073 | top = bot + half; | |
1074 | } | |
1075 | ||
1076 | if (DECL_NAME (field_array[bot]) == component) | |
1077 | field = field_array[bot]; | |
1078 | else if (DECL_NAME (field) != component) | |
1079 | field = 0; | |
1080 | } | |
1081 | else | |
1082 | { | |
1083 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
1084 | { | |
1085 | if (DECL_NAME (field) == component) | |
1086 | break; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | if (!field) | |
1091 | { | |
1092 | error (code == RECORD_TYPE | |
1093 | ? "structure has no member named `%s'" | |
1094 | : "union has no member named `%s'", | |
1095 | IDENTIFIER_POINTER (component)); | |
1096 | return error_mark_node; | |
1097 | } | |
1098 | if (TREE_TYPE (field) == error_mark_node) | |
1099 | return error_mark_node; | |
1100 | ||
1101 | ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); | |
1102 | ||
1103 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1104 | TREE_READONLY (ref) = 1; | |
1105 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1106 | TREE_THIS_VOLATILE (ref) = 1; | |
1107 | ||
1108 | return ref; | |
1109 | } | |
1110 | else if (code != ERROR_MARK) | |
1111 | error ("request for member `%s' in something not a structure or union", | |
1112 | IDENTIFIER_POINTER (component)); | |
1113 | ||
1114 | return error_mark_node; | |
1115 | } | |
1116 | \f | |
1117 | /* Given an expression PTR for a pointer, return an expression | |
1118 | for the value pointed to. | |
1119 | ERRORSTRING is the name of the operator to appear in error messages. */ | |
1120 | ||
1121 | tree | |
1122 | build_indirect_ref (ptr, errorstring) | |
1123 | tree ptr; | |
1124 | char *errorstring; | |
1125 | { | |
1126 | register tree pointer = default_conversion (ptr); | |
1127 | register tree type = TREE_TYPE (pointer); | |
1128 | ||
1129 | if (TREE_CODE (type) == POINTER_TYPE) | |
870cc33b RS |
1130 | { |
1131 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1132 | && !flag_volatile | |
1133 | && (TREE_TYPE (TREE_OPERAND (pointer, 0)) | |
1134 | == TREE_TYPE (type))) | |
1135 | return TREE_OPERAND (pointer, 0); | |
1136 | else | |
1137 | { | |
1138 | tree t = TREE_TYPE (type); | |
1139 | register tree ref = build1 (INDIRECT_REF, | |
1140 | TYPE_MAIN_VARIANT (t), pointer); | |
400fbf9f | 1141 | |
870cc33b RS |
1142 | if (TYPE_SIZE (t) == 0 && TREE_CODE (t) != ARRAY_TYPE) |
1143 | { | |
1144 | error ("dereferencing pointer to incomplete type"); | |
1145 | return error_mark_node; | |
1146 | } | |
1147 | if (TREE_CODE (t) == VOID_TYPE) | |
1148 | warning ("dereferencing `void *' pointer"); | |
1149 | ||
1150 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, | |
1151 | so that we get the proper error message if the result is used | |
1152 | to assign to. Also, &* is supposed to be a no-op. | |
1153 | And ANSI C seems to specify that the type of the result | |
1154 | should be the const type. */ | |
1155 | /* A de-reference of a pointer to const is not a const. It is valid | |
1156 | to change it via some other pointer. */ | |
1157 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
1158 | TREE_SIDE_EFFECTS (ref) | |
1159 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile; | |
1160 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t) || flag_volatile; | |
1161 | return ref; | |
1162 | } | |
1163 | } | |
400fbf9f JW |
1164 | else if (TREE_CODE (pointer) != ERROR_MARK) |
1165 | error ("invalid type argument of `%s'", errorstring); | |
1166 | return error_mark_node; | |
1167 | } | |
1168 | ||
1169 | /* This handles expressions of the form "a[i]", which denotes | |
1170 | an array reference. | |
1171 | ||
1172 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
1173 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
1174 | This avoids forcing the array out of registers, and can work on | |
1175 | arrays that are not lvalues (for example, members of structures returned | |
1176 | by functions). */ | |
1177 | ||
1178 | tree | |
1179 | build_array_ref (array, index) | |
1180 | tree array, index; | |
1181 | { | |
1182 | if (index == 0) | |
1183 | { | |
1184 | error ("subscript missing in array reference"); | |
1185 | return error_mark_node; | |
1186 | } | |
1187 | ||
1188 | if (TREE_TYPE (array) == error_mark_node | |
1189 | || TREE_TYPE (index) == error_mark_node) | |
1190 | return error_mark_node; | |
1191 | ||
1192 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE | |
1193 | && TREE_CODE (array) != INDIRECT_REF) | |
1194 | { | |
1195 | tree rval, type; | |
1196 | ||
400fbf9f JW |
1197 | /* Subscripting with type char is likely to lose |
1198 | on a machine where chars are signed. | |
1199 | So warn on any machine, but optionally. | |
1200 | Don't warn for unsigned char since that type is safe. | |
1201 | Don't warn for signed char because anyone who uses that | |
1202 | must have done so deliberately. */ | |
1203 | if (warn_char_subscripts | |
1204 | && TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node) | |
1205 | warning ("array subscript has type `char'"); | |
1206 | ||
0e51ef9b RS |
1207 | /* Apply default promotions *after* noticing character types. */ |
1208 | index = default_conversion (index); | |
1209 | ||
fdeefd49 RS |
1210 | /* Require integer *after* promotion, for sake of enums. */ |
1211 | if (TREE_CODE (TREE_TYPE (index)) != INTEGER_TYPE) | |
1212 | { | |
1213 | error ("array subscript is not an integer"); | |
1214 | return error_mark_node; | |
1215 | } | |
1216 | ||
400fbf9f JW |
1217 | /* An array that is indexed by a non-constant |
1218 | cannot be stored in a register; we must be able to do | |
1219 | address arithmetic on its address. | |
1220 | Likewise an array of elements of variable size. */ | |
1221 | if (TREE_CODE (index) != INTEGER_CST | |
1222 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
1223 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
1224 | { | |
1225 | if (mark_addressable (array) == 0) | |
1226 | return error_mark_node; | |
1227 | } | |
1228 | ||
1229 | if (pedantic && !lvalue_p (array)) | |
1230 | { | |
1394aabd | 1231 | if (DECL_REGISTER (array)) |
400fbf9f JW |
1232 | pedwarn ("ANSI C forbids subscripting `register' array"); |
1233 | else | |
1234 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); | |
1235 | } | |
1236 | ||
1237 | if (pedantic) | |
1238 | { | |
1239 | tree foo = array; | |
1240 | while (TREE_CODE (foo) == COMPONENT_REF) | |
1241 | foo = TREE_OPERAND (foo, 0); | |
1394aabd | 1242 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) |
400fbf9f JW |
1243 | pedwarn ("ANSI C forbids subscripting non-lvalue array"); |
1244 | } | |
1245 | ||
1246 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
1247 | rval = build (ARRAY_REF, type, array, index); | |
1248 | /* Array ref is const/volatile if the array elements are | |
1249 | or if the array is. */ | |
1250 | TREE_READONLY (rval) | |
1251 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
1252 | | TREE_READONLY (array)); | |
1253 | TREE_SIDE_EFFECTS (rval) | |
1254 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1255 | | TREE_SIDE_EFFECTS (array)); | |
1256 | TREE_THIS_VOLATILE (rval) | |
1257 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
1258 | /* This was added by rms on 16 Nov 91. | |
1259 | It fixes vol struct foo *a; a->elts[1] | |
1260 | in an inline function. | |
1261 | Hope it doesn't break something else. */ | |
1262 | | TREE_THIS_VOLATILE (array)); | |
1263 | return require_complete_type (fold (rval)); | |
1264 | } | |
1265 | ||
1266 | { | |
1267 | tree ar = default_conversion (array); | |
1268 | tree ind = default_conversion (index); | |
1269 | ||
1270 | /* Put the integer in IND to simplify error checking. */ | |
1271 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
1272 | { | |
1273 | tree temp = ar; | |
1274 | ar = ind; | |
1275 | ind = temp; | |
1276 | } | |
1277 | ||
1278 | if (ar == error_mark_node) | |
1279 | return ar; | |
1280 | ||
1281 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) | |
1282 | { | |
1283 | error ("subscripted value is neither array nor pointer"); | |
1284 | return error_mark_node; | |
1285 | } | |
1286 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
1287 | { | |
1288 | error ("array subscript is not an integer"); | |
1289 | return error_mark_node; | |
1290 | } | |
1291 | ||
1292 | return build_indirect_ref (build_binary_op (PLUS_EXPR, ar, ind, 0), | |
1293 | "array indexing"); | |
1294 | } | |
1295 | } | |
1296 | \f | |
1297 | /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against PARAMS. */ | |
1298 | ||
1299 | #define ISDIGIT(c) ((c) >= '0' && (c) <= '9') | |
1300 | ||
1301 | #define T_I &integer_type_node | |
1302 | #define T_L &long_integer_type_node | |
1303 | #define T_S &short_integer_type_node | |
1304 | #define T_UI &unsigned_type_node | |
1305 | #define T_UL &long_unsigned_type_node | |
1306 | #define T_US &short_unsigned_type_node | |
1307 | #define T_F &float_type_node | |
1308 | #define T_D &double_type_node | |
1309 | #define T_LD &long_double_type_node | |
1310 | #define T_C &char_type_node | |
1311 | #define T_V &void_type_node | |
d3c738e1 | 1312 | #define T_W &wchar_type_node |
400fbf9f JW |
1313 | |
1314 | typedef struct | |
1315 | { | |
1316 | char *format_chars; | |
1317 | int pointer_count; | |
1318 | /* Type of argument if no length modifier is used. */ | |
1319 | tree *nolen; | |
1320 | /* Type of argument if length modifier for shortening is used. | |
1321 | If NULL, then this modifier is not allowed. */ | |
1322 | tree *hlen; | |
1323 | /* Type of argument if length modifier `l' is used. | |
1324 | If NULL, then this modifier is not allowed. */ | |
1325 | tree *llen; | |
1326 | /* Type of argument if length modifier `L' is used. | |
1327 | If NULL, then this modifier is not allowed. */ | |
1328 | tree *bigllen; | |
1329 | /* List of other modifier characters allowed with these options. */ | |
1330 | char *flag_chars; | |
1331 | } format_char_info; | |
1332 | ||
1333 | static format_char_info print_table[] | |
1334 | = { | |
1335 | { "di", 0, T_I, T_I, T_L, NULL, "-wp0 +" }, | |
1336 | { "oxX", 0, T_UI, T_UI, T_UL, NULL, "-wp0#" }, | |
1337 | { "u", 0, T_UI, T_UI, T_UL, NULL, "-wp0" }, | |
1338 | { "feEgG", 0, T_D, NULL, NULL, T_LD, "-wp0 +#" }, | |
d3c738e1 RS |
1339 | { "c", 0, T_I, NULL, T_W, NULL, "-w" }, |
1340 | { "C", 0, T_W, NULL, NULL, NULL, "-w" }, | |
1341 | { "s", 1, T_C, NULL, T_W, NULL, "-wp" }, | |
1342 | { "S", 1, T_W, NULL, NULL, NULL, "-wp" }, | |
400fbf9f JW |
1343 | { "p", 1, T_V, NULL, NULL, NULL, "-" }, |
1344 | { "n", 1, T_I, T_S, T_L, NULL, "" }, | |
1345 | { NULL } | |
1346 | }; | |
1347 | ||
1348 | static format_char_info scan_table[] | |
1349 | = { | |
1350 | { "di", 1, T_I, T_S, T_L, NULL, "*" }, | |
1351 | { "ouxX", 1, T_UI, T_US, T_UL, NULL, "*" }, | |
1352 | { "efgEG", 1, T_F, NULL, T_D, T_LD, "*" }, | |
d3c738e1 RS |
1353 | { "sc", 1, T_C, NULL, T_W, NULL, "*" }, |
1354 | { "[", 1, T_C, NULL, NULL, NULL, "*" }, | |
1355 | { "C", 1, T_W, NULL, NULL, NULL, "*" }, | |
1356 | { "S", 1, T_W, NULL, NULL, NULL, "*" }, | |
400fbf9f JW |
1357 | { "p", 2, T_V, NULL, NULL, NULL, "*" }, |
1358 | { "n", 1, T_I, T_S, T_L, NULL, "" }, | |
1359 | { NULL } | |
1360 | }; | |
1361 | ||
1362 | typedef struct | |
1363 | { | |
1364 | tree function_ident; /* identifier such as "printf" */ | |
1365 | int is_scan; /* TRUE if *scanf */ | |
1366 | int format_num; /* number of format argument */ | |
1367 | int first_arg_num; /* number of first arg (zero for varargs) */ | |
1368 | } function_info; | |
1369 | ||
1370 | static unsigned int function_info_entries = 0; | |
1371 | static function_info *function_info_table = NULL; | |
1372 | ||
1373 | /* Record information for argument format checking. FUNCTION_IDENT is | |
1374 | the identifier node for the name of the function to check (its decl | |
1375 | need not exist yet). IS_SCAN is true for scanf-type format checking; | |
1376 | false indicates printf-style format checking. FORMAT_NUM is the number | |
1377 | of the argument which is the format control string (starting from 1). | |
1378 | FIRST_ARG_NUM is the number of the first actual argument to check | |
1379 | against teh format string, or zero if no checking is not be done | |
1380 | (e.g. for varargs such as vfprintf). */ | |
1381 | ||
1382 | void | |
1383 | record_format_info (function_ident, is_scan, format_num, first_arg_num) | |
1384 | tree function_ident; | |
1385 | int is_scan; | |
1386 | int format_num; | |
1387 | int first_arg_num; | |
1388 | { | |
1389 | function_info *info; | |
1390 | ||
1391 | function_info_entries++; | |
1392 | if (function_info_table) | |
1393 | function_info_table | |
1394 | = (function_info *) xrealloc (function_info_table, | |
1395 | function_info_entries * sizeof (function_info)); | |
1396 | else | |
1397 | function_info_table = (function_info *) xmalloc (sizeof (function_info)); | |
1398 | ||
1399 | info = &function_info_table[function_info_entries - 1]; | |
1400 | ||
1401 | info->function_ident = function_ident; | |
1402 | info->is_scan = is_scan; | |
1403 | info->format_num = format_num; | |
1404 | info->first_arg_num = first_arg_num; | |
1405 | } | |
1406 | ||
1407 | /* Initialize the table of functions to perform format checking on. | |
1408 | The ANSI functions are always checked (whether <stdio.h> is | |
1409 | included or not), since it is common to call printf without | |
1410 | including <stdio.h>. There shouldn't be a problem with this, | |
1411 | since ANSI reserves these function names whether you include the | |
1412 | header file or not. In any case, the checking is harmless. */ | |
1413 | ||
1414 | void | |
1415 | init_format_info_table () | |
1416 | { | |
1417 | record_format_info (get_identifier ("printf"), 0, 1, 2); | |
1418 | record_format_info (get_identifier ("fprintf"), 0, 2, 3); | |
1419 | record_format_info (get_identifier ("sprintf"), 0, 2, 3); | |
1420 | record_format_info (get_identifier ("scanf"), 1, 1, 2); | |
1421 | record_format_info (get_identifier ("fscanf"), 1, 2, 3); | |
1422 | record_format_info (get_identifier ("sscanf"), 1, 2, 3); | |
1423 | record_format_info (get_identifier ("vprintf"), 0, 1, 0); | |
1424 | record_format_info (get_identifier ("vfprintf"), 0, 2, 0); | |
1425 | record_format_info (get_identifier ("vsprintf"), 0, 2, 0); | |
1426 | } | |
1427 | ||
1428 | static char tfaff[] = "too few arguments for format"; | |
400fbf9f JW |
1429 | \f |
1430 | /* Check the argument list of a call to printf, scanf, etc. | |
1431 | INFO points to the element of function_info_table. | |
1432 | PARAMS is the list of argument values. */ | |
1433 | ||
1434 | static void | |
1435 | check_format (info, params) | |
1436 | function_info *info; | |
1437 | tree params; | |
1438 | { | |
1439 | int i; | |
1440 | int arg_num; | |
1441 | int suppressed, wide, precise; | |
1442 | int length_char; | |
1443 | int format_char; | |
1444 | int format_length; | |
1445 | tree format_tree; | |
1446 | tree cur_param; | |
1447 | tree cur_type; | |
1448 | tree wanted_type; | |
1449 | char *format_chars; | |
1450 | format_char_info *fci; | |
1451 | static char message[132]; | |
1452 | char flag_chars[8]; | |
1453 | ||
1454 | /* Skip to format argument. If the argument isn't available, there's | |
1455 | no work for us to do; prototype checking will catch the problem. */ | |
1456 | for (arg_num = 1; ; ++arg_num) | |
1457 | { | |
1458 | if (params == 0) | |
1459 | return; | |
1460 | if (arg_num == info->format_num) | |
1461 | break; | |
1462 | params = TREE_CHAIN (params); | |
1463 | } | |
1464 | format_tree = TREE_VALUE (params); | |
1465 | params = TREE_CHAIN (params); | |
1466 | if (format_tree == 0) | |
1467 | return; | |
1468 | /* We can only check the format if it's a string constant. */ | |
1469 | while (TREE_CODE (format_tree) == NOP_EXPR) | |
1470 | format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */ | |
1471 | if (format_tree == null_pointer_node) | |
1472 | { | |
1473 | warning ("null format string"); | |
1474 | return; | |
1475 | } | |
1476 | if (TREE_CODE (format_tree) != ADDR_EXPR) | |
1477 | return; | |
1478 | format_tree = TREE_OPERAND (format_tree, 0); | |
1479 | if (TREE_CODE (format_tree) != STRING_CST) | |
1480 | return; | |
1481 | format_chars = TREE_STRING_POINTER (format_tree); | |
1482 | format_length = TREE_STRING_LENGTH (format_tree); | |
1483 | if (format_length <= 1) | |
1484 | warning ("zero-length format string"); | |
1485 | if (format_chars[--format_length] != 0) | |
1486 | { | |
1487 | warning ("unterminated format string"); | |
1488 | return; | |
1489 | } | |
1490 | /* Skip to first argument to check. */ | |
1491 | while (arg_num + 1 < info->first_arg_num) | |
1492 | { | |
1493 | if (params == 0) | |
1494 | return; | |
1495 | params = TREE_CHAIN (params); | |
1496 | ++arg_num; | |
1497 | } | |
1498 | while (1) | |
1499 | { | |
1500 | if (*format_chars == 0) | |
1501 | { | |
1502 | if (format_chars - TREE_STRING_POINTER (format_tree) != format_length) | |
1503 | warning ("embedded `\\0' in format"); | |
1504 | if (info->first_arg_num != 0 && params != 0) | |
1505 | warning ("too many arguments for format"); | |
1506 | return; | |
1507 | } | |
1508 | if (*format_chars++ != '%') | |
1509 | continue; | |
1510 | if (*format_chars == 0) | |
1511 | { | |
1512 | warning ("spurious trailing `%%' in format"); | |
1513 | continue; | |
1514 | } | |
1515 | if (*format_chars == '%') | |
1516 | { | |
1517 | ++format_chars; | |
1518 | continue; | |
1519 | } | |
1520 | flag_chars[0] = 0; | |
1521 | suppressed = wide = precise = FALSE; | |
1522 | if (info->is_scan) | |
1523 | { | |
1524 | suppressed = *format_chars == '*'; | |
1525 | if (suppressed) | |
1526 | ++format_chars; | |
1527 | while (ISDIGIT (*format_chars)) | |
1528 | ++format_chars; | |
1529 | } | |
1530 | else | |
1531 | { | |
3845b542 | 1532 | while (*format_chars != 0 && index (" +#0-", *format_chars) != 0) |
400fbf9f | 1533 | { |
3845b542 | 1534 | if (index (flag_chars, *format_chars) != 0) |
400fbf9f JW |
1535 | { |
1536 | sprintf (message, "repeated `%c' flag in format", | |
1537 | *format_chars); | |
1538 | warning (message); | |
1539 | } | |
1540 | i = strlen (flag_chars); | |
1541 | flag_chars[i++] = *format_chars++; | |
1542 | flag_chars[i] = 0; | |
1543 | } | |
1544 | /* "If the space and + flags both appear, | |
1545 | the space flag will be ignored." */ | |
3845b542 MS |
1546 | if (index (flag_chars, ' ') != 0 |
1547 | && index (flag_chars, '+') != 0) | |
400fbf9f JW |
1548 | warning ("use of both ` ' and `+' flags in format"); |
1549 | /* "If the 0 and - flags both appear, | |
1550 | the 0 flag will be ignored." */ | |
3845b542 MS |
1551 | if (index (flag_chars, '0') != 0 |
1552 | && index (flag_chars, '-') != 0) | |
400fbf9f JW |
1553 | warning ("use of both `0' and `-' flags in format"); |
1554 | if (*format_chars == '*') | |
1555 | { | |
1556 | wide = TRUE; | |
1557 | /* "...a field width...may be indicated by an asterisk. | |
1558 | In this case, an int argument supplies the field width..." */ | |
1559 | ++format_chars; | |
1560 | if (params == 0) | |
1561 | { | |
1562 | warning (tfaff); | |
1563 | return; | |
1564 | } | |
1565 | if (info->first_arg_num != 0) | |
1566 | { | |
1567 | cur_param = TREE_VALUE (params); | |
1568 | params = TREE_CHAIN (params); | |
1569 | ++arg_num; | |
0597a777 RS |
1570 | /* size_t is generally not valid here. |
1571 | It will work on most machines, because size_t and int | |
1572 | have the same mode. But might as well warn anyway, | |
1573 | since it will fail on other machines. */ | |
6cb72a7d RS |
1574 | if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param)) |
1575 | != integer_type_node) | |
400fbf9f JW |
1576 | { |
1577 | sprintf (message, | |
1578 | "field width is not type int (arg %d)", | |
1579 | arg_num); | |
1580 | warning (message); | |
1581 | } | |
1582 | } | |
1583 | } | |
1584 | else | |
1585 | { | |
1586 | while (ISDIGIT (*format_chars)) | |
1587 | { | |
1588 | wide = TRUE; | |
1589 | ++format_chars; | |
1590 | } | |
1591 | } | |
1592 | if (*format_chars == '.') | |
1593 | { | |
1594 | precise = TRUE; | |
400fbf9f JW |
1595 | ++format_chars; |
1596 | if (*format_chars != '*' && !ISDIGIT (*format_chars)) | |
1597 | warning ("`.' not followed by `*' or digit in format"); | |
1598 | /* "...a...precision...may be indicated by an asterisk. | |
1599 | In this case, an int argument supplies the...precision." */ | |
1600 | if (*format_chars == '*') | |
1601 | { | |
1602 | if (info->first_arg_num != 0) | |
1603 | { | |
1604 | ++format_chars; | |
1605 | if (params == 0) | |
1606 | { | |
1607 | warning (tfaff); | |
1608 | return; | |
1609 | } | |
1610 | cur_param = TREE_VALUE (params); | |
1611 | params = TREE_CHAIN (params); | |
1612 | ++arg_num; | |
6cb72a7d RS |
1613 | if (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param)) |
1614 | != integer_type_node) | |
400fbf9f JW |
1615 | { |
1616 | sprintf (message, | |
1617 | "field width is not type int (arg %d)", | |
1618 | arg_num); | |
1619 | warning (message); | |
1620 | } | |
1621 | } | |
1622 | } | |
1623 | else | |
1624 | { | |
1625 | while (ISDIGIT (*format_chars)) | |
1626 | ++format_chars; | |
1627 | } | |
1628 | } | |
1629 | } | |
1630 | if (*format_chars == 'h' || *format_chars == 'l' || *format_chars == 'L') | |
1631 | length_char = *format_chars++; | |
1632 | else | |
1633 | length_char = 0; | |
1634 | if (suppressed && length_char != 0) | |
1635 | { | |
1636 | sprintf (message, | |
1637 | "use of `*' and `%c' together in format", | |
1638 | length_char); | |
1639 | warning (message); | |
1640 | } | |
1641 | format_char = *format_chars; | |
1642 | if (format_char == 0) | |
1643 | { | |
1644 | warning ("conversion lacks type at end of format"); | |
1645 | continue; | |
1646 | } | |
1647 | format_chars++; | |
1648 | fci = info->is_scan ? scan_table : print_table; | |
1649 | while (1) | |
1650 | { | |
1651 | if (fci->format_chars == 0 | |
3845b542 | 1652 | || index (fci->format_chars, format_char) != 0) |
400fbf9f JW |
1653 | break; |
1654 | ++fci; | |
1655 | } | |
1656 | if (fci->format_chars == 0) | |
1657 | { | |
e64bddee | 1658 | if (format_char >= 040 && format_char < 0177) |
400fbf9f JW |
1659 | sprintf (message, |
1660 | "unknown conversion type character `%c' in format", | |
1661 | format_char); | |
1662 | else | |
1663 | sprintf (message, | |
1664 | "unknown conversion type character 0x%x in format", | |
1665 | format_char); | |
1666 | warning (message); | |
1667 | continue; | |
1668 | } | |
3845b542 | 1669 | if (wide && index (fci->flag_chars, 'w') == 0) |
400fbf9f JW |
1670 | { |
1671 | sprintf (message, "width used with `%c' format", | |
1672 | format_char); | |
1673 | warning (message); | |
1674 | } | |
3845b542 | 1675 | if (precise && index (fci->flag_chars, 'p') == 0) |
400fbf9f JW |
1676 | { |
1677 | sprintf (message, "precision used with `%c' format", | |
1678 | format_char); | |
1679 | warning (message); | |
1680 | } | |
1681 | if (suppressed) | |
1682 | { | |
3845b542 | 1683 | if (index (fci->flag_chars, '*') == 0) |
400fbf9f JW |
1684 | { |
1685 | sprintf (message, | |
1686 | "suppression of `%c' conversion in format", | |
1687 | format_char); | |
1688 | warning (message); | |
1689 | } | |
1690 | continue; | |
1691 | } | |
1692 | for (i = 0; flag_chars[i] != 0; ++i) | |
1693 | { | |
3845b542 | 1694 | if (index (fci->flag_chars, flag_chars[i]) == 0) |
400fbf9f JW |
1695 | { |
1696 | sprintf (message, "flag `%c' used with type `%c'", | |
1697 | flag_chars[i], format_char); | |
1698 | warning (message); | |
1699 | } | |
1700 | } | |
8d162cab RK |
1701 | if (precise && index (flag_chars, '0') != 0 |
1702 | && (format_char == 'd' || format_char == 'i' | |
1703 | || format_char == 'o' || format_char == 'u' | |
1704 | || format_char == 'x' || format_char == 'x')) | |
1705 | { | |
1706 | sprintf (message, | |
1707 | "precision and `0' flag not both allowed with `%c' format", | |
1708 | format_char); | |
1709 | warning (message); | |
1710 | } | |
400fbf9f JW |
1711 | switch (length_char) |
1712 | { | |
1713 | default: wanted_type = fci->nolen ? *(fci->nolen) : 0; break; | |
1714 | case 'h': wanted_type = fci->hlen ? *(fci->hlen) : 0; break; | |
1715 | case 'l': wanted_type = fci->llen ? *(fci->llen) : 0; break; | |
1716 | case 'L': wanted_type = fci->bigllen ? *(fci->bigllen) : 0; break; | |
1717 | } | |
1718 | if (wanted_type == 0) | |
1719 | { | |
1720 | sprintf (message, | |
1721 | "use of `%c' length character with `%c' type character", | |
1722 | length_char, format_char); | |
1723 | warning (message); | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | ** XXX -- should kvetch about stuff such as | |
1728 | ** { | |
1729 | ** const int i; | |
1730 | ** | |
1731 | ** scanf ("%d", &i); | |
1732 | ** } | |
1733 | */ | |
1734 | ||
1735 | /* Finally. . .check type of argument against desired type! */ | |
1736 | if (info->first_arg_num == 0) | |
1737 | continue; | |
1738 | if (params == 0) | |
1739 | { | |
1740 | warning (tfaff); | |
1741 | return; | |
1742 | } | |
1743 | cur_param = TREE_VALUE (params); | |
1744 | params = TREE_CHAIN (params); | |
1745 | ++arg_num; | |
1746 | cur_type = TREE_TYPE (cur_param); | |
1747 | ||
1748 | /* Check the types of any additional pointer arguments | |
1749 | that precede the "real" argument. */ | |
1750 | for (i = 0; i < fci->pointer_count; ++i) | |
1751 | { | |
1752 | if (TREE_CODE (cur_type) == POINTER_TYPE) | |
1753 | { | |
1754 | cur_type = TREE_TYPE (cur_type); | |
1755 | continue; | |
1756 | } | |
1757 | sprintf (message, | |
1758 | "format argument is not a %s (arg %d)", | |
1759 | ((fci->pointer_count == 1) ? "pointer" : "pointer to a pointer"), | |
1760 | arg_num); | |
1761 | warning (message); | |
1762 | break; | |
1763 | } | |
1764 | ||
1765 | /* Check the type of the "real" argument, if there's a type we want. */ | |
1766 | if (i == fci->pointer_count && wanted_type != 0 | |
6cb72a7d | 1767 | && wanted_type != TYPE_MAIN_VARIANT (cur_type) |
047de90b RS |
1768 | /* If we want `void *', allow any pointer type. |
1769 | (Anything else would already have got a warning.) */ | |
1770 | && ! (wanted_type == void_type_node | |
1771 | && fci->pointer_count > 0) | |
400fbf9f JW |
1772 | /* Don't warn about differences merely in signedness. */ |
1773 | && !(TREE_CODE (wanted_type) == INTEGER_TYPE | |
1774 | && TREE_CODE (cur_type) == INTEGER_TYPE | |
1775 | && TYPE_PRECISION (wanted_type) == TYPE_PRECISION (cur_type))) | |
1776 | { | |
1777 | register char *this; | |
1778 | register char *that; | |
1779 | ||
1780 | this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type))); | |
1781 | that = 0; | |
047de90b RS |
1782 | if (TYPE_NAME (cur_type) != 0 |
1783 | && TREE_CODE (cur_type) != INTEGER_TYPE | |
1784 | && !(TREE_CODE (cur_type) == POINTER_TYPE | |
1785 | && TREE_CODE (TREE_TYPE (cur_type)) == INTEGER_TYPE) | |
1786 | && DECL_NAME (TYPE_NAME (cur_type)) != 0) | |
1787 | that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type))); | |
400fbf9f JW |
1788 | |
1789 | /* A nameless type can't possibly match what the format wants. | |
1790 | So there will be a warning for it. | |
1791 | Make up a string to describe vaguely what it is. */ | |
1792 | if (that == 0) | |
1793 | { | |
1794 | if (TREE_CODE (cur_type) == POINTER_TYPE) | |
1795 | that = "pointer"; | |
1796 | else | |
1797 | that = "different type"; | |
1798 | } | |
1799 | ||
1800 | if (strcmp (this, that) != 0) | |
1801 | { | |
1802 | sprintf (message, "%s format, %s arg (arg %d)", | |
1803 | this, that, arg_num); | |
1804 | warning (message); | |
1805 | } | |
1806 | } | |
1807 | } | |
1808 | } | |
1809 | \f | |
1810 | /* Build a function call to function FUNCTION with parameters PARAMS. | |
1811 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
1812 | TREE_VALUE of each node is a parameter-expression. | |
1813 | FUNCTION's data type may be a function type or a pointer-to-function. */ | |
1814 | ||
1815 | tree | |
1816 | build_function_call (function, params) | |
1817 | tree function, params; | |
1818 | { | |
9b7267b8 | 1819 | register tree fntype, fundecl; |
400fbf9f JW |
1820 | register tree coerced_params; |
1821 | tree name = NULL_TREE; | |
1822 | ||
fc76e425 | 1823 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce | 1824 | STRIP_TYPE_NOPS (function); |
400fbf9f JW |
1825 | |
1826 | /* Convert anything with function type to a pointer-to-function. */ | |
1827 | if (TREE_CODE (function) == FUNCTION_DECL) | |
1828 | { | |
1829 | name = DECL_NAME (function); | |
1830 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE | |
1831 | (because calling an inline function does not mean the function | |
1832 | needs to be separately compiled). */ | |
1833 | fntype = build_type_variant (TREE_TYPE (function), | |
1834 | TREE_READONLY (function), | |
1835 | TREE_THIS_VOLATILE (function)); | |
9b7267b8 | 1836 | fundecl = function; |
400fbf9f JW |
1837 | function = build1 (ADDR_EXPR, build_pointer_type (fntype), function); |
1838 | } | |
1839 | else | |
1840 | function = default_conversion (function); | |
1841 | ||
1842 | fntype = TREE_TYPE (function); | |
1843 | ||
1844 | if (TREE_CODE (fntype) == ERROR_MARK) | |
1845 | return error_mark_node; | |
1846 | ||
1847 | if (!(TREE_CODE (fntype) == POINTER_TYPE | |
1848 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE)) | |
1849 | { | |
1850 | error ("called object is not a function"); | |
1851 | return error_mark_node; | |
1852 | } | |
1853 | ||
1854 | /* fntype now gets the type of function pointed to. */ | |
1855 | fntype = TREE_TYPE (fntype); | |
1856 | ||
1857 | /* Convert the parameters to the types declared in the | |
1858 | function prototype, or apply default promotions. */ | |
1859 | ||
1860 | coerced_params | |
9b7267b8 | 1861 | = convert_arguments (TYPE_ARG_TYPES (fntype), params, name, fundecl); |
400fbf9f JW |
1862 | |
1863 | /* Check for errors in format strings. */ | |
1864 | if (warn_format && name != 0) | |
1865 | { | |
1866 | unsigned int i; | |
1867 | ||
1868 | /* See if this function is a format function. */ | |
1869 | for (i = 0; i < function_info_entries; i++) | |
1870 | if (function_info_table[i].function_ident == name) | |
1871 | { | |
1872 | register char *message; | |
1873 | ||
1874 | /* If so, check it. */ | |
1875 | check_format (&function_info_table[i], coerced_params); | |
1876 | break; | |
1877 | } | |
1878 | } | |
1879 | ||
1880 | /* Recognize certain built-in functions so we can make tree-codes | |
1881 | other than CALL_EXPR. We do this when it enables fold-const.c | |
1882 | to do something useful. */ | |
1883 | ||
1884 | if (TREE_CODE (function) == ADDR_EXPR | |
1885 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
1886 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
1887 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
1888 | { | |
1889 | case BUILT_IN_ABS: | |
1890 | case BUILT_IN_LABS: | |
1891 | case BUILT_IN_FABS: | |
1892 | if (coerced_params == 0) | |
1893 | return integer_zero_node; | |
1894 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
1895 | } | |
1896 | ||
1897 | { | |
1898 | register tree result | |
1899 | = build (CALL_EXPR, TREE_TYPE (fntype), | |
1900 | function, coerced_params, NULL_TREE); | |
1901 | ||
1902 | TREE_SIDE_EFFECTS (result) = 1; | |
1903 | if (TREE_TYPE (result) == void_type_node) | |
1904 | return result; | |
1905 | return require_complete_type (result); | |
1906 | } | |
1907 | } | |
1908 | \f | |
1909 | /* Convert the argument expressions in the list VALUES | |
1910 | to the types in the list TYPELIST. The result is a list of converted | |
1911 | argument expressions. | |
1912 | ||
1913 | If TYPELIST is exhausted, or when an element has NULL as its type, | |
1914 | perform the default conversions. | |
1915 | ||
1916 | PARMLIST is the chain of parm decls for the function being called. | |
1917 | It may be 0, if that info is not available. | |
1918 | It is used only for generating error messages. | |
1919 | ||
1920 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
1921 | ||
1922 | This is also where warnings about wrong number of args are generated. | |
1923 | ||
1924 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
1925 | with the elements of the list in the TREE_VALUE slots of those nodes. */ | |
1926 | ||
1927 | static tree | |
9b7267b8 RS |
1928 | convert_arguments (typelist, values, name, fundecl) |
1929 | tree typelist, values, name, fundecl; | |
400fbf9f JW |
1930 | { |
1931 | register tree typetail, valtail; | |
1932 | register tree result = NULL; | |
1933 | int parmnum; | |
1934 | ||
1935 | /* Scan the given expressions and types, producing individual | |
1936 | converted arguments and pushing them on RESULT in reverse order. */ | |
1937 | ||
1938 | for (valtail = values, typetail = typelist, parmnum = 0; | |
1939 | valtail; | |
1940 | valtail = TREE_CHAIN (valtail), parmnum++) | |
1941 | { | |
1942 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
1943 | register tree val = TREE_VALUE (valtail); | |
1944 | ||
1945 | if (type == void_type_node) | |
1946 | { | |
1947 | if (name) | |
1948 | error ("too many arguments to function `%s'", | |
1949 | IDENTIFIER_POINTER (name)); | |
1950 | else | |
1951 | error ("too many arguments to function"); | |
1952 | break; | |
1953 | } | |
1954 | ||
1955 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
1956 | /* Do not use STRIP_NOPS here! We do not want an enumerator with value 0 |
1957 | to convert automatically to a pointer. */ | |
400fbf9f JW |
1958 | if (TREE_CODE (val) == NON_LVALUE_EXPR) |
1959 | val = TREE_OPERAND (val, 0); | |
1960 | ||
1961 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
1962 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE) | |
1963 | val = default_conversion (val); | |
1964 | ||
1965 | val = require_complete_type (val); | |
1966 | ||
1967 | if (type != 0) | |
1968 | { | |
1969 | /* Formal parm type is specified by a function prototype. */ | |
1970 | tree parmval; | |
1971 | ||
1972 | if (TYPE_SIZE (type) == 0) | |
1973 | { | |
1974 | error ("type of formal parameter %d is incomplete", parmnum + 1); | |
1975 | parmval = val; | |
1976 | } | |
1977 | else | |
1978 | { | |
1979 | tree parmname; | |
1980 | #ifdef PROMOTE_PROTOTYPES | |
1981 | /* Rather than truncating and then reextending, | |
1982 | convert directly to int, if that's the type we will want. */ | |
1983 | if (! flag_traditional | |
1984 | && TREE_CODE (type) == INTEGER_TYPE | |
1985 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
1986 | type = integer_type_node; | |
1987 | #endif | |
1988 | ||
1989 | #if 0 /* This turns out not to win--there's no way to write a prototype | |
1990 | for a function whose arg type is a union with no tag. */ | |
1991 | /* Nameless union automatically casts the types it contains. */ | |
1992 | if (TREE_CODE (type) == UNION_TYPE && TYPE_NAME (type) == 0) | |
1993 | { | |
1994 | tree field; | |
1995 | ||
1996 | for (field = TYPE_FIELDS (type); field; | |
1997 | field = TREE_CHAIN (field)) | |
1998 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
1999 | TYPE_MAIN_VARIANT (TREE_TYPE (val)))) | |
2000 | break; | |
2001 | ||
2002 | if (field) | |
2003 | val = build1 (CONVERT_EXPR, type, val); | |
2004 | } | |
2005 | #endif | |
2006 | ||
d45cf215 RS |
2007 | /* Optionally warn about conversions that |
2008 | differ from the default conversions. */ | |
400fbf9f JW |
2009 | if (warn_conversion) |
2010 | { | |
2011 | int formal_prec = TYPE_PRECISION (type); | |
400fbf9f JW |
2012 | |
2013 | if (TREE_CODE (type) != REAL_TYPE | |
2014 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
754a4d82 | 2015 | warn_for_assignment ("%s as integer rather than floating due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f JW |
2016 | else if (TREE_CODE (type) == REAL_TYPE |
2017 | && TREE_CODE (TREE_TYPE (val)) != REAL_TYPE) | |
754a4d82 | 2018 | warn_for_assignment ("%s as floating rather than integer due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 RS |
2019 | else if (TREE_CODE (type) == REAL_TYPE |
2020 | && TREE_CODE (TREE_TYPE (val)) == REAL_TYPE) | |
2021 | { | |
2022 | /* Warn if any argument is passed as `float', | |
047de90b | 2023 | since without a prototype it would be `double'. */ |
d45cf215 | 2024 | if (formal_prec == TYPE_PRECISION (float_type_node)) |
754a4d82 | 2025 | warn_for_assignment ("%s as `float' rather than `double' due to prototype", (char *) 0, name, parmnum + 1); |
d45cf215 | 2026 | } |
400fbf9f JW |
2027 | /* Detect integer changing in width or signedness. */ |
2028 | else if ((TREE_CODE (type) == INTEGER_TYPE | |
2029 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2030 | && (TREE_CODE (TREE_TYPE (val)) == INTEGER_TYPE | |
d45cf215 | 2031 | || TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE)) |
400fbf9f | 2032 | { |
d45cf215 RS |
2033 | tree would_have_been = default_conversion (val); |
2034 | tree type1 = TREE_TYPE (would_have_been); | |
2035 | ||
754a4d82 RS |
2036 | if (TREE_CODE (type) == ENUMERAL_TYPE |
2037 | && type == TREE_TYPE (val)) | |
2038 | /* No warning if function asks for enum | |
2039 | and the actual arg is that enum type. */ | |
2040 | ; | |
2041 | else if (formal_prec != TYPE_PRECISION (type1)) | |
2042 | warn_for_assignment ("%s with different width due to prototype", (char *) 0, name, parmnum + 1); | |
d45cf215 RS |
2043 | else if (TREE_UNSIGNED (type) == TREE_UNSIGNED (type1)) |
2044 | ; | |
800cd3b9 RS |
2045 | /* Don't complain if the formal parameter type |
2046 | is an enum, because we can't tell now whether | |
2047 | the value was an enum--even the same enum. */ | |
2048 | else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
2049 | ; | |
400fbf9f JW |
2050 | else if (TREE_CODE (val) == INTEGER_CST |
2051 | && int_fits_type_p (val, type)) | |
2052 | /* Change in signedness doesn't matter | |
2053 | if a constant value is unaffected. */ | |
2054 | ; | |
047de90b RS |
2055 | else if (TREE_CODE (TREE_TYPE (val)) == ENUMERAL_TYPE |
2056 | && int_fits_type_p (TYPE_MIN_VALUE (TREE_TYPE (val)), type) | |
2057 | && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (val)), type)) | |
2058 | /* Change in signedness doesn't matter | |
2059 | if an enum value is unaffected. */ | |
2060 | ; | |
400fbf9f | 2061 | else if (TREE_UNSIGNED (type)) |
754a4d82 | 2062 | warn_for_assignment ("%s as unsigned due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f | 2063 | else |
754a4d82 | 2064 | warn_for_assignment ("%s as signed due to prototype", (char *) 0, name, parmnum + 1); |
400fbf9f JW |
2065 | } |
2066 | } | |
2067 | ||
2068 | parmval = convert_for_assignment (type, val, | |
2069 | (char *)0, /* arg passing */ | |
9b7267b8 | 2070 | fundecl, name, parmnum + 1); |
400fbf9f JW |
2071 | |
2072 | #ifdef PROMOTE_PROTOTYPES | |
2073 | if (TREE_CODE (type) == INTEGER_TYPE | |
2074 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2075 | parmval = default_conversion (parmval); | |
2076 | #endif | |
2077 | } | |
8d9bfdc5 | 2078 | result = tree_cons (NULL_TREE, parmval, result); |
400fbf9f JW |
2079 | } |
2080 | else if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2081 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2082 | < TYPE_PRECISION (double_type_node))) | |
2083 | /* Convert `float' to `double'. */ | |
2084 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
2085 | else | |
2086 | /* Convert `short' and `char' to full-size `int'. */ | |
2087 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
2088 | ||
2089 | if (typetail) | |
2090 | typetail = TREE_CHAIN (typetail); | |
2091 | } | |
2092 | ||
2093 | if (typetail != 0 && TREE_VALUE (typetail) != void_type_node) | |
2094 | { | |
2095 | if (name) | |
2096 | error ("too few arguments to function `%s'", | |
2097 | IDENTIFIER_POINTER (name)); | |
2098 | else | |
2099 | error ("too few arguments to function"); | |
2100 | } | |
2101 | ||
2102 | return nreverse (result); | |
2103 | } | |
2104 | \f | |
2105 | /* This is the entry point used by the parser | |
2106 | for binary operators in the input. | |
2107 | In addition to constructing the expression, | |
2108 | we check for operands that were written with other binary operators | |
2109 | in a way that is likely to confuse the user. */ | |
edc7c4ec | 2110 | |
400fbf9f JW |
2111 | tree |
2112 | parser_build_binary_op (code, arg1, arg2) | |
2113 | enum tree_code code; | |
2114 | tree arg1, arg2; | |
2115 | { | |
2116 | tree result = build_binary_op (code, arg1, arg2, 1); | |
2117 | ||
2118 | char class; | |
2119 | char class1 = TREE_CODE_CLASS (TREE_CODE (arg1)); | |
2120 | char class2 = TREE_CODE_CLASS (TREE_CODE (arg2)); | |
2121 | enum tree_code code1 = ERROR_MARK; | |
2122 | enum tree_code code2 = ERROR_MARK; | |
2123 | ||
2124 | if (class1 == 'e' || class1 == '1' | |
2125 | || class1 == '2' || class1 == '<') | |
2126 | code1 = C_EXP_ORIGINAL_CODE (arg1); | |
2127 | if (class2 == 'e' || class2 == '1' | |
2128 | || class2 == '2' || class2 == '<') | |
2129 | code2 = C_EXP_ORIGINAL_CODE (arg2); | |
2130 | ||
2131 | /* Check for cases such as x+y<<z which users are likely | |
2132 | to misinterpret. If parens are used, C_EXP_ORIGINAL_CODE | |
2133 | is cleared to prevent these warnings. */ | |
2134 | if (warn_parentheses) | |
2135 | { | |
2136 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
2137 | { | |
2138 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2139 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2140 | warning ("suggest parentheses around + or - inside shift"); | |
2141 | } | |
2142 | ||
2143 | if (code == TRUTH_ORIF_EXPR) | |
2144 | { | |
2145 | if (code1 == TRUTH_ANDIF_EXPR | |
2146 | || code2 == TRUTH_ANDIF_EXPR) | |
2147 | warning ("suggest parentheses around && within ||"); | |
2148 | } | |
2149 | ||
2150 | if (code == BIT_IOR_EXPR) | |
2151 | { | |
2152 | if (code1 == BIT_AND_EXPR || code1 == BIT_XOR_EXPR | |
2153 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2154 | || code2 == BIT_AND_EXPR || code2 == BIT_XOR_EXPR | |
2155 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2156 | warning ("suggest parentheses around arithmetic in operand of |"); | |
2157 | } | |
2158 | ||
2159 | if (code == BIT_XOR_EXPR) | |
2160 | { | |
2161 | if (code1 == BIT_AND_EXPR | |
2162 | || code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2163 | || code2 == BIT_AND_EXPR | |
2164 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2165 | warning ("suggest parentheses around arithmetic in operand of ^"); | |
2166 | } | |
2167 | ||
2168 | if (code == BIT_AND_EXPR) | |
2169 | { | |
2170 | if (code1 == PLUS_EXPR || code1 == MINUS_EXPR | |
2171 | || code2 == PLUS_EXPR || code2 == MINUS_EXPR) | |
2172 | warning ("suggest parentheses around + or - in operand of &"); | |
2173 | } | |
2174 | } | |
2175 | ||
001af587 | 2176 | /* Similarly, check for cases like 1<=i<=10 that are probably errors. */ |
edc7c4ec | 2177 | if (TREE_CODE_CLASS (code) == '<' && extra_warnings |
001af587 RS |
2178 | && (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<')) |
2179 | warning ("comparisons like X<=Y<=Z do not have their mathematical meaning"); | |
2180 | ||
e58cd767 RS |
2181 | unsigned_conversion_warning (result, arg1); |
2182 | unsigned_conversion_warning (result, arg2); | |
2183 | overflow_warning (result); | |
2184 | ||
edc7c4ec RS |
2185 | class = TREE_CODE_CLASS (TREE_CODE (result)); |
2186 | ||
400fbf9f JW |
2187 | /* Record the code that was specified in the source, |
2188 | for the sake of warnings about confusing nesting. */ | |
2189 | if (class == 'e' || class == '1' | |
2190 | || class == '2' || class == '<') | |
2191 | C_SET_EXP_ORIGINAL_CODE (result, code); | |
2192 | else | |
2193 | { | |
2194 | int flag = TREE_CONSTANT (result); | |
2195 | result = build1 (NON_LVALUE_EXPR, TREE_TYPE (result), result); | |
2196 | C_SET_EXP_ORIGINAL_CODE (result, code); | |
2197 | TREE_CONSTANT (result) = flag; | |
2198 | } | |
2199 | ||
2200 | return result; | |
2201 | } | |
2202 | ||
2203 | /* Build a binary-operation expression without default conversions. | |
2204 | CODE is the kind of expression to build. | |
2205 | This function differs from `build' in several ways: | |
2206 | the data type of the result is computed and recorded in it, | |
2207 | warnings are generated if arg data types are invalid, | |
2208 | special handling for addition and subtraction of pointers is known, | |
2209 | and some optimization is done (operations on narrow ints | |
2210 | are done in the narrower type when that gives the same result). | |
2211 | Constant folding is also done before the result is returned. | |
2212 | ||
2213 | Note that the operands will never have enumeral types, or function | |
2214 | or array types, because either they will have the default conversions | |
2215 | performed or they have both just been converted to some other type in which | |
2216 | the arithmetic is to be done. */ | |
2217 | ||
2218 | tree | |
2219 | build_binary_op (code, orig_op0, orig_op1, convert_p) | |
2220 | enum tree_code code; | |
2221 | tree orig_op0, orig_op1; | |
2222 | int convert_p; | |
2223 | { | |
2224 | tree type0, type1; | |
2225 | register enum tree_code code0, code1; | |
2226 | tree op0, op1; | |
2227 | ||
2228 | /* Expression code to give to the expression when it is built. | |
2229 | Normally this is CODE, which is what the caller asked for, | |
2230 | but in some special cases we change it. */ | |
2231 | register enum tree_code resultcode = code; | |
2232 | ||
2233 | /* Data type in which the computation is to be performed. | |
2234 | In the simplest cases this is the common type of the arguments. */ | |
2235 | register tree result_type = NULL; | |
2236 | ||
2237 | /* Nonzero means operands have already been type-converted | |
2238 | in whatever way is necessary. | |
2239 | Zero means they need to be converted to RESULT_TYPE. */ | |
2240 | int converted = 0; | |
2241 | ||
2242 | /* Nonzero means after finally constructing the expression | |
2243 | give it this type. Otherwise, give it type RESULT_TYPE. */ | |
2244 | tree final_type = 0; | |
2245 | ||
2246 | /* Nonzero if this is an operation like MIN or MAX which can | |
2247 | safely be computed in short if both args are promoted shorts. | |
2248 | Also implies COMMON. | |
2249 | -1 indicates a bitwise operation; this makes a difference | |
2250 | in the exact conditions for when it is safe to do the operation | |
2251 | in a narrower mode. */ | |
2252 | int shorten = 0; | |
2253 | ||
2254 | /* Nonzero if this is a comparison operation; | |
2255 | if both args are promoted shorts, compare the original shorts. | |
2256 | Also implies COMMON. */ | |
2257 | int short_compare = 0; | |
2258 | ||
2259 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
2260 | original short and then promoted if the operand is a promoted short. */ | |
2261 | int short_shift = 0; | |
2262 | ||
2263 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
2264 | int common = 0; | |
2265 | ||
2266 | if (convert_p) | |
2267 | { | |
2268 | op0 = default_conversion (orig_op0); | |
2269 | op1 = default_conversion (orig_op1); | |
2270 | } | |
2271 | else | |
2272 | { | |
2273 | op0 = orig_op0; | |
2274 | op1 = orig_op1; | |
2275 | } | |
2276 | ||
2277 | type0 = TREE_TYPE (op0); | |
2278 | type1 = TREE_TYPE (op1); | |
2279 | ||
2280 | /* The expression codes of the data types of the arguments tell us | |
2281 | whether the arguments are integers, floating, pointers, etc. */ | |
2282 | code0 = TREE_CODE (type0); | |
2283 | code1 = TREE_CODE (type1); | |
2284 | ||
fc76e425 | 2285 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
a7d53fce RS |
2286 | STRIP_TYPE_NOPS (op0); |
2287 | STRIP_TYPE_NOPS (op1); | |
400fbf9f JW |
2288 | |
2289 | /* If an error was already reported for one of the arguments, | |
2290 | avoid reporting another error. */ | |
2291 | ||
2292 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
2293 | return error_mark_node; | |
2294 | ||
2295 | switch (code) | |
2296 | { | |
2297 | case PLUS_EXPR: | |
2298 | /* Handle the pointer + int case. */ | |
2299 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2300 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
2301 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
2302 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
2303 | else | |
2304 | common = 1; | |
2305 | break; | |
2306 | ||
2307 | case MINUS_EXPR: | |
2308 | /* Subtraction of two similar pointers. | |
2309 | We must subtract them as integers, then divide by object size. */ | |
2310 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
2311 | && comp_target_types (type0, type1)) | |
2312 | return pointer_diff (op0, op1); | |
2313 | /* Handle pointer minus int. Just like pointer plus int. */ | |
2314 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2315 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
2316 | else | |
2317 | common = 1; | |
2318 | break; | |
2319 | ||
2320 | case MULT_EXPR: | |
2321 | common = 1; | |
2322 | break; | |
2323 | ||
2324 | case TRUNC_DIV_EXPR: | |
2325 | case CEIL_DIV_EXPR: | |
2326 | case FLOOR_DIV_EXPR: | |
2327 | case ROUND_DIV_EXPR: | |
2328 | case EXACT_DIV_EXPR: | |
b6a10c9f RS |
2329 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2330 | || code0 == COMPLEX_TYPE) | |
2331 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2332 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2333 | { |
2334 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) | |
2335 | resultcode = RDIV_EXPR; | |
2336 | else | |
6c9e1cb2 RS |
2337 | /* When dividing two signed integers, you have to promote to int. |
2338 | E.g. (short) -32868 / (short) -1 doesn't fit in a short. */ | |
2339 | shorten = TREE_UNSIGNED (op0); | |
400fbf9f JW |
2340 | common = 1; |
2341 | } | |
2342 | break; | |
2343 | ||
2344 | case BIT_AND_EXPR: | |
2345 | case BIT_ANDTC_EXPR: | |
2346 | case BIT_IOR_EXPR: | |
2347 | case BIT_XOR_EXPR: | |
2348 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2349 | shorten = -1; | |
2350 | /* If one operand is a constant, and the other is a short type | |
2351 | that has been converted to an int, | |
2352 | really do the work in the short type and then convert the | |
2353 | result to int. If we are lucky, the constant will be 0 or 1 | |
2354 | in the short type, making the entire operation go away. */ | |
2355 | if (TREE_CODE (op0) == INTEGER_CST | |
2356 | && TREE_CODE (op1) == NOP_EXPR | |
2357 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
2358 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
2359 | { | |
2360 | final_type = result_type; | |
2361 | op1 = TREE_OPERAND (op1, 0); | |
2362 | result_type = TREE_TYPE (op1); | |
2363 | } | |
2364 | if (TREE_CODE (op1) == INTEGER_CST | |
2365 | && TREE_CODE (op0) == NOP_EXPR | |
2366 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
2367 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
2368 | { | |
2369 | final_type = result_type; | |
2370 | op0 = TREE_OPERAND (op0, 0); | |
2371 | result_type = TREE_TYPE (op0); | |
2372 | } | |
2373 | break; | |
2374 | ||
2375 | case TRUNC_MOD_EXPR: | |
047de90b | 2376 | case FLOOR_MOD_EXPR: |
400fbf9f JW |
2377 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
2378 | shorten = 1; | |
2379 | break; | |
2380 | ||
2381 | case TRUTH_ANDIF_EXPR: | |
2382 | case TRUTH_ORIF_EXPR: | |
2383 | case TRUTH_AND_EXPR: | |
2384 | case TRUTH_OR_EXPR: | |
1eca8b1e | 2385 | case TRUTH_XOR_EXPR: |
b6a10c9f RS |
2386 | if ((code0 == INTEGER_TYPE || code0 == POINTER_TYPE |
2387 | || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) | |
2388 | && (code1 == INTEGER_TYPE || code1 == POINTER_TYPE | |
2389 | || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2390 | { |
2391 | /* Result of these operations is always an int, | |
2392 | but that does not mean the operands should be | |
2393 | converted to ints! */ | |
2394 | result_type = integer_type_node; | |
2395 | op0 = truthvalue_conversion (op0); | |
2396 | op1 = truthvalue_conversion (op1); | |
2397 | converted = 1; | |
2398 | } | |
2399 | break; | |
2400 | ||
2401 | /* Shift operations: result has same type as first operand; | |
2402 | always convert second operand to int. | |
2403 | Also set SHORT_SHIFT if shifting rightward. */ | |
2404 | ||
2405 | case RSHIFT_EXPR: | |
2406 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2407 | { | |
2408 | if (TREE_CODE (op1) == INTEGER_CST) | |
2409 | { | |
17651386 | 2410 | if (tree_int_cst_lt (op1, integer_zero_node)) |
315da535 | 2411 | warning ("right shift count is negative"); |
17651386 RS |
2412 | else |
2413 | { | |
2414 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
2415 | short_shift = 1; | |
2416 | if (TREE_INT_CST_HIGH (op1) != 0 | |
2417 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2418 | >= TYPE_PRECISION (type0))) | |
315da535 | 2419 | warning ("right shift count >= width of type"); |
17651386 | 2420 | } |
400fbf9f | 2421 | } |
d45cf215 RS |
2422 | /* Use the type of the value to be shifted. |
2423 | This is what most traditional C compilers do. */ | |
2424 | result_type = type0; | |
400fbf9f JW |
2425 | /* Unless traditional, convert the shift-count to an integer, |
2426 | regardless of size of value being shifted. */ | |
2427 | if (! flag_traditional) | |
2428 | { | |
6cb72a7d | 2429 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2430 | op1 = convert (integer_type_node, op1); |
2431 | /* Avoid converting op1 to result_type later. */ | |
2432 | converted = 1; | |
2433 | } | |
400fbf9f JW |
2434 | } |
2435 | break; | |
2436 | ||
2437 | case LSHIFT_EXPR: | |
2438 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2439 | { | |
17651386 RS |
2440 | if (TREE_CODE (op1) == INTEGER_CST) |
2441 | { | |
2442 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
315da535 | 2443 | warning ("left shift count is negative"); |
17651386 RS |
2444 | else if (TREE_INT_CST_HIGH (op1) != 0 |
2445 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2446 | >= TYPE_PRECISION (type0))) | |
315da535 | 2447 | warning ("left shift count >= width of type"); |
17651386 | 2448 | } |
d45cf215 RS |
2449 | /* Use the type of the value to be shifted. |
2450 | This is what most traditional C compilers do. */ | |
2451 | result_type = type0; | |
400fbf9f JW |
2452 | /* Unless traditional, convert the shift-count to an integer, |
2453 | regardless of size of value being shifted. */ | |
2454 | if (! flag_traditional) | |
2455 | { | |
6cb72a7d | 2456 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2457 | op1 = convert (integer_type_node, op1); |
2458 | /* Avoid converting op1 to result_type later. */ | |
2459 | converted = 1; | |
2460 | } | |
400fbf9f JW |
2461 | } |
2462 | break; | |
2463 | ||
2464 | case RROTATE_EXPR: | |
2465 | case LROTATE_EXPR: | |
2466 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
2467 | { | |
17651386 RS |
2468 | if (TREE_CODE (op1) == INTEGER_CST) |
2469 | { | |
2470 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
2471 | warning ("shift count is negative"); | |
2472 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
2473 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
2474 | >= TYPE_PRECISION (type0))) | |
2475 | warning ("shift count >= width of type"); | |
2476 | } | |
d45cf215 RS |
2477 | /* Use the type of the value to be shifted. |
2478 | This is what most traditional C compilers do. */ | |
2479 | result_type = type0; | |
400fbf9f JW |
2480 | /* Unless traditional, convert the shift-count to an integer, |
2481 | regardless of size of value being shifted. */ | |
2482 | if (! flag_traditional) | |
2483 | { | |
6cb72a7d | 2484 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) |
400fbf9f JW |
2485 | op1 = convert (integer_type_node, op1); |
2486 | /* Avoid converting op1 to result_type later. */ | |
2487 | converted = 1; | |
2488 | } | |
400fbf9f JW |
2489 | } |
2490 | break; | |
2491 | ||
2492 | case EQ_EXPR: | |
2493 | case NE_EXPR: | |
2494 | /* Result of comparison is always int, | |
2495 | but don't convert the args to int! */ | |
2496 | result_type = integer_type_node; | |
2497 | converted = 1; | |
b6a10c9f RS |
2498 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2499 | || code0 == COMPLEX_TYPE) | |
2500 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2501 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2502 | short_compare = 1; |
2503 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2504 | { | |
2505 | register tree tt0 = TREE_TYPE (type0); | |
2506 | register tree tt1 = TREE_TYPE (type1); | |
2507 | /* Anything compares with void *. void * compares with anything. | |
2508 | Otherwise, the targets must be the same. */ | |
2509 | if (comp_target_types (type0, type1)) | |
2510 | ; | |
2511 | else if (TYPE_MAIN_VARIANT (tt0) == void_type_node) | |
2512 | { | |
2513 | if (pedantic && !integer_zerop (op0) | |
2514 | && TREE_CODE (tt1) == FUNCTION_TYPE) | |
2515 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2516 | } | |
2517 | else if (TYPE_MAIN_VARIANT (tt1) == void_type_node) | |
2518 | { | |
2519 | if (pedantic && !integer_zerop (op1) | |
2520 | && TREE_CODE (tt0) == FUNCTION_TYPE) | |
2521 | pedwarn ("ANSI C forbids comparison of `void *' with function pointer"); | |
2522 | } | |
2523 | else | |
2524 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2525 | } | |
2526 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2527 | && integer_zerop (op1)) | |
2528 | op1 = null_pointer_node; | |
2529 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2530 | && integer_zerop (op0)) | |
2531 | op0 = null_pointer_node; | |
2532 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2533 | { | |
2534 | if (! flag_traditional) | |
2535 | pedwarn ("comparison between pointer and integer"); | |
2536 | op1 = convert (TREE_TYPE (op0), op1); | |
2537 | } | |
2538 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2539 | { | |
2540 | if (! flag_traditional) | |
2541 | pedwarn ("comparison between pointer and integer"); | |
2542 | op0 = convert (TREE_TYPE (op1), op0); | |
2543 | } | |
2544 | else | |
2545 | /* If args are not valid, clear out RESULT_TYPE | |
2546 | to cause an error message later. */ | |
2547 | result_type = 0; | |
2548 | break; | |
2549 | ||
2550 | case MAX_EXPR: | |
2551 | case MIN_EXPR: | |
b6a10c9f RS |
2552 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2553 | || code0 == COMPLEX_TYPE) | |
2554 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2555 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2556 | shorten = 1; |
2557 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2558 | { | |
2559 | if (! comp_target_types (type0, type1)) | |
2560 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2561 | else if (pedantic | |
2562 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2563 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2564 | result_type = common_type (type0, type1); | |
2565 | } | |
2566 | break; | |
2567 | ||
2568 | case LE_EXPR: | |
2569 | case GE_EXPR: | |
2570 | case LT_EXPR: | |
2571 | case GT_EXPR: | |
b6a10c9f RS |
2572 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
2573 | || code0 == COMPLEX_TYPE) | |
2574 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
2575 | || code1 == COMPLEX_TYPE)) | |
400fbf9f JW |
2576 | short_compare = 1; |
2577 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
2578 | { | |
2579 | if (! comp_target_types (type0, type1)) | |
2580 | pedwarn ("comparison of distinct pointer types lacks a cast"); | |
2581 | else if (pedantic | |
2582 | && TREE_CODE (TREE_TYPE (type0)) == FUNCTION_TYPE) | |
2583 | pedwarn ("ANSI C forbids ordered comparisons of pointers to functions"); | |
2584 | result_type = integer_type_node; | |
2585 | } | |
2586 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
2587 | && integer_zerop (op1)) | |
2588 | { | |
2589 | result_type = integer_type_node; | |
2590 | op1 = null_pointer_node; | |
2591 | if (! flag_traditional) | |
2592 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2593 | } | |
2594 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST | |
2595 | && integer_zerop (op0)) | |
2596 | { | |
2597 | result_type = integer_type_node; | |
2598 | op0 = null_pointer_node; | |
2599 | if (pedantic) | |
2600 | pedwarn ("ordered comparison of pointer with integer zero"); | |
2601 | } | |
2602 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
2603 | { | |
2604 | result_type = integer_type_node; | |
2605 | if (! flag_traditional) | |
2606 | pedwarn ("comparison between pointer and integer"); | |
2607 | op1 = convert (TREE_TYPE (op0), op1); | |
2608 | } | |
2609 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
2610 | { | |
2611 | result_type = integer_type_node; | |
2612 | if (! flag_traditional) | |
2613 | pedwarn ("comparison between pointer and integer"); | |
2614 | op0 = convert (TREE_TYPE (op1), op0); | |
2615 | } | |
2616 | converted = 1; | |
2617 | break; | |
2618 | } | |
2619 | ||
b6a10c9f RS |
2620 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) |
2621 | && | |
2622 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
400fbf9f | 2623 | { |
b6a10c9f RS |
2624 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
2625 | ||
400fbf9f JW |
2626 | if (shorten || common || short_compare) |
2627 | result_type = common_type (type0, type1); | |
2628 | ||
2629 | /* For certain operations (which identify themselves by shorten != 0) | |
2630 | if both args were extended from the same smaller type, | |
2631 | do the arithmetic in that type and then extend. | |
2632 | ||
2633 | shorten !=0 and !=1 indicates a bitwise operation. | |
2634 | For them, this optimization is safe only if | |
2635 | both args are zero-extended or both are sign-extended. | |
2636 | Otherwise, we might change the result. | |
2637 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
2638 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
2639 | ||
b6a10c9f | 2640 | if (shorten && none_complex) |
400fbf9f JW |
2641 | { |
2642 | int unsigned0, unsigned1; | |
2643 | tree arg0 = get_narrower (op0, &unsigned0); | |
2644 | tree arg1 = get_narrower (op1, &unsigned1); | |
2645 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
2646 | int uns = TREE_UNSIGNED (result_type); | |
2647 | tree type; | |
2648 | ||
2649 | final_type = result_type; | |
2650 | ||
e7951b3f | 2651 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion |
400fbf9f JW |
2652 | but it *requires* conversion to FINAL_TYPE. */ |
2653 | ||
e7951b3f RS |
2654 | if ((TYPE_PRECISION (TREE_TYPE (op0)) |
2655 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2656 | && TREE_TYPE (op0) != final_type) | |
400fbf9f | 2657 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); |
e7951b3f RS |
2658 | if ((TYPE_PRECISION (TREE_TYPE (op1)) |
2659 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
2660 | && TREE_TYPE (op1) != final_type) | |
400fbf9f JW |
2661 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); |
2662 | ||
2663 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
2664 | ||
2665 | /* For bitwise operations, signedness of nominal type | |
2666 | does not matter. Consider only how operands were extended. */ | |
2667 | if (shorten == -1) | |
2668 | uns = unsigned0; | |
2669 | ||
2670 | /* Note that in all three cases below we refrain from optimizing | |
2671 | an unsigned operation on sign-extended args. | |
2672 | That would not be valid. */ | |
2673 | ||
2674 | /* Both args variable: if both extended in same way | |
2675 | from same width, do it in that width. | |
2676 | Do it unsigned if args were zero-extended. */ | |
2677 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
2678 | < TYPE_PRECISION (result_type)) | |
2679 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2680 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
2681 | && unsigned0 == unsigned1 | |
2682 | && (unsigned0 || !uns)) | |
2683 | result_type | |
2684 | = signed_or_unsigned_type (unsigned0, | |
2685 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
2686 | else if (TREE_CODE (arg0) == INTEGER_CST | |
2687 | && (unsigned1 || !uns) | |
2688 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
2689 | < TYPE_PRECISION (result_type)) | |
2690 | && (type = signed_or_unsigned_type (unsigned1, | |
2691 | TREE_TYPE (arg1)), | |
2692 | int_fits_type_p (arg0, type))) | |
2693 | result_type = type; | |
2694 | else if (TREE_CODE (arg1) == INTEGER_CST | |
2695 | && (unsigned0 || !uns) | |
2696 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
2697 | < TYPE_PRECISION (result_type)) | |
2698 | && (type = signed_or_unsigned_type (unsigned0, | |
2699 | TREE_TYPE (arg0)), | |
2700 | int_fits_type_p (arg1, type))) | |
2701 | result_type = type; | |
2702 | } | |
2703 | ||
2704 | /* Shifts can be shortened if shifting right. */ | |
2705 | ||
2706 | if (short_shift) | |
2707 | { | |
2708 | int unsigned_arg; | |
2709 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
2710 | ||
2711 | final_type = result_type; | |
2712 | ||
2713 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
2714 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
2715 | ||
2716 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
2717 | /* If arg is sign-extended and then unsigned-shifted, | |
2718 | we can simulate this with a signed shift in arg's type | |
2719 | only if the extended result is at least twice as wide | |
2720 | as the arg. Otherwise, the shift could use up all the | |
2721 | ones made by sign-extension and bring in zeros. | |
2722 | We can't optimize that case at all, but in most machines | |
2723 | it never happens because available widths are 2**N. */ | |
2724 | && (!TREE_UNSIGNED (final_type) | |
2725 | || unsigned_arg | |
2726 | || 2 * TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (result_type))) | |
2727 | { | |
2728 | /* Do an unsigned shift if the operand was zero-extended. */ | |
2729 | result_type | |
2730 | = signed_or_unsigned_type (unsigned_arg, | |
2731 | TREE_TYPE (arg0)); | |
2732 | /* Convert value-to-be-shifted to that type. */ | |
2733 | if (TREE_TYPE (op0) != result_type) | |
2734 | op0 = convert (result_type, op0); | |
2735 | converted = 1; | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | /* Comparison operations are shortened too but differently. | |
2740 | They identify themselves by setting short_compare = 1. */ | |
2741 | ||
b6a10c9f | 2742 | if (short_compare && none_complex) |
400fbf9f JW |
2743 | { |
2744 | /* Don't write &op0, etc., because that would prevent op0 | |
2745 | from being kept in a register. | |
2746 | Instead, make copies of the our local variables and | |
2747 | pass the copies by reference, then copy them back afterward. */ | |
2748 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
2749 | enum tree_code xresultcode = resultcode; | |
2750 | tree val | |
2751 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
2752 | if (val != 0) | |
2753 | return val; | |
2754 | op0 = xop0, op1 = xop1, result_type = xresult_type; | |
2755 | resultcode = xresultcode; | |
2756 | ||
2757 | if (extra_warnings) | |
2758 | { | |
2759 | tree op0_type = TREE_TYPE (orig_op0); | |
2760 | tree op1_type = TREE_TYPE (orig_op1); | |
2761 | int op0_unsigned = TREE_UNSIGNED (op0_type); | |
2762 | int op1_unsigned = TREE_UNSIGNED (op1_type); | |
2763 | ||
2764 | /* Give warnings for comparisons between signed and unsigned | |
2765 | quantities that will fail. Do not warn if the signed quantity | |
2766 | is an unsuffixed integer literal (or some static constant | |
2767 | expression involving such literals) and it is positive. | |
2768 | Do not warn if the width of the unsigned quantity is less | |
2769 | than that of the signed quantity, since in this case all | |
2770 | values of the unsigned quantity fit in the signed quantity. | |
2771 | Do not warn if the signed type is the same size as the | |
2772 | result_type since sign extension does not cause trouble in | |
2773 | this case. */ | |
2774 | /* Do the checking based on the original operand trees, so that | |
2775 | casts will be considered, but default promotions won't be. */ | |
2776 | if (op0_unsigned != op1_unsigned | |
2777 | && ((op0_unsigned | |
2778 | && TYPE_PRECISION (op0_type) >= TYPE_PRECISION (op1_type) | |
2779 | && TYPE_PRECISION (op0_type) < TYPE_PRECISION (result_type) | |
2780 | && (TREE_CODE (op1) != INTEGER_CST | |
2781 | || (TREE_CODE (op1) == INTEGER_CST | |
2782 | && INT_CST_LT (op1, integer_zero_node)))) | |
2783 | || | |
2784 | (op1_unsigned | |
2785 | && TYPE_PRECISION (op1_type) >= TYPE_PRECISION (op0_type) | |
2786 | && TYPE_PRECISION (op1_type) < TYPE_PRECISION (result_type) | |
2787 | && (TREE_CODE (op0) != INTEGER_CST | |
2788 | || (TREE_CODE (op0) == INTEGER_CST | |
2789 | && INT_CST_LT (op0, integer_zero_node)))))) | |
2790 | warning ("comparison between signed and unsigned"); | |
2791 | } | |
2792 | } | |
2793 | } | |
2794 | ||
2795 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
2796 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
2797 | Then the expression will be built. | |
2798 | It will be given type FINAL_TYPE if that is nonzero; | |
2799 | otherwise, it will be given type RESULT_TYPE. */ | |
2800 | ||
2801 | if (!result_type) | |
2802 | { | |
2803 | binary_op_error (code); | |
2804 | return error_mark_node; | |
2805 | } | |
2806 | ||
2807 | if (! converted) | |
2808 | { | |
2809 | if (TREE_TYPE (op0) != result_type) | |
2810 | op0 = convert (result_type, op0); | |
2811 | if (TREE_TYPE (op1) != result_type) | |
2812 | op1 = convert (result_type, op1); | |
2813 | } | |
2814 | ||
2815 | { | |
2816 | register tree result = build (resultcode, result_type, op0, op1); | |
2817 | register tree folded; | |
2818 | ||
2819 | folded = fold (result); | |
2820 | if (folded == result) | |
2821 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2822 | if (final_type != 0) | |
2823 | return convert (final_type, folded); | |
2824 | return folded; | |
2825 | } | |
2826 | } | |
2827 | \f | |
2828 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
2829 | of pointer PTROP and integer INTOP. */ | |
2830 | ||
2831 | static tree | |
2832 | pointer_int_sum (resultcode, ptrop, intop) | |
2833 | enum tree_code resultcode; | |
2834 | register tree ptrop, intop; | |
2835 | { | |
2836 | tree size_exp; | |
2837 | ||
2838 | register tree result; | |
2839 | register tree folded; | |
2840 | ||
2841 | /* The result is a pointer of the same type that is being added. */ | |
2842 | ||
2843 | register tree result_type = TREE_TYPE (ptrop); | |
2844 | ||
2845 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2846 | { | |
2847 | if (pedantic || warn_pointer_arith) | |
2848 | pedwarn ("pointer of type `void *' used in arithmetic"); | |
2849 | size_exp = integer_one_node; | |
2850 | } | |
2851 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2852 | { | |
2853 | if (pedantic || warn_pointer_arith) | |
2854 | pedwarn ("pointer to a function used in arithmetic"); | |
2855 | size_exp = integer_one_node; | |
2856 | } | |
2857 | else | |
2858 | size_exp = c_size_in_bytes (TREE_TYPE (result_type)); | |
2859 | ||
2860 | /* If what we are about to multiply by the size of the elements | |
2861 | contains a constant term, apply distributive law | |
2862 | and multiply that constant term separately. | |
2863 | This helps produce common subexpressions. */ | |
2864 | ||
2865 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
2866 | && ! TREE_CONSTANT (intop) | |
2867 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
2868 | && TREE_CONSTANT (size_exp) | |
2869 | /* If the constant comes from pointer subtraction, | |
2870 | skip this optimization--it would cause an error. */ | |
2871 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE) | |
2872 | { | |
2873 | enum tree_code subcode = resultcode; | |
d45cf215 | 2874 | tree int_type = TREE_TYPE (intop); |
400fbf9f JW |
2875 | if (TREE_CODE (intop) == MINUS_EXPR) |
2876 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
d45cf215 RS |
2877 | /* Convert both subexpression types to the type of intop, |
2878 | because weird cases involving pointer arithmetic | |
2879 | can result in a sum or difference with different type args. */ | |
2880 | ptrop = build_binary_op (subcode, ptrop, | |
2881 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2882 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
400fbf9f JW |
2883 | } |
2884 | ||
2885 | /* Convert the integer argument to a type the same size as a pointer | |
2886 | so the multiply won't overflow spuriously. */ | |
2887 | ||
2888 | if (TYPE_PRECISION (TREE_TYPE (intop)) != POINTER_SIZE) | |
2889 | intop = convert (type_for_size (POINTER_SIZE, 0), intop); | |
2890 | ||
2891 | /* Replace the integer argument | |
2892 | with a suitable product by the object size. */ | |
2893 | ||
2894 | intop = build_binary_op (MULT_EXPR, intop, size_exp, 1); | |
2895 | ||
2896 | /* Create the sum or difference. */ | |
2897 | ||
2898 | result = build (resultcode, result_type, ptrop, intop); | |
2899 | ||
2900 | folded = fold (result); | |
2901 | if (folded == result) | |
2902 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
2903 | return folded; | |
2904 | } | |
2905 | ||
2906 | /* Return a tree for the difference of pointers OP0 and OP1. | |
2907 | The resulting tree has type int. */ | |
2908 | ||
2909 | static tree | |
2910 | pointer_diff (op0, op1) | |
2911 | register tree op0, op1; | |
2912 | { | |
2913 | register tree result, folded; | |
2914 | tree restype = ptrdiff_type_node; | |
2915 | ||
2916 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
2917 | ||
2918 | if (pedantic || warn_pointer_arith) | |
2919 | { | |
2920 | if (TREE_CODE (target_type) == VOID_TYPE) | |
2921 | pedwarn ("pointer of type `void *' used in subtraction"); | |
2922 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
2923 | pedwarn ("pointer to a function used in subtraction"); | |
2924 | } | |
2925 | ||
2926 | /* First do the subtraction as integers; | |
2927 | then drop through to build the divide operator. */ | |
2928 | ||
2929 | op0 = build_binary_op (MINUS_EXPR, convert (restype, op0), | |
2930 | convert (restype, op1), 1); | |
2931 | op1 = c_size_in_bytes (target_type); | |
2932 | ||
2933 | /* Divide by the size, in easiest possible way. */ | |
2934 | ||
2935 | result = build (EXACT_DIV_EXPR, restype, op0, op1); | |
2936 | ||
2937 | folded = fold (result); | |
2938 | if (folded == result) | |
2939 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
2940 | return folded; | |
2941 | } | |
2942 | \f | |
2943 | /* Construct and perhaps optimize a tree representation | |
2944 | for a unary operation. CODE, a tree_code, specifies the operation | |
2945 | and XARG is the operand. NOCONVERT nonzero suppresses | |
2946 | the default promotions (such as from short to int). */ | |
2947 | ||
2948 | tree | |
2949 | build_unary_op (code, xarg, noconvert) | |
2950 | enum tree_code code; | |
2951 | tree xarg; | |
2952 | int noconvert; | |
2953 | { | |
2954 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
2955 | register tree arg = xarg; | |
2956 | register tree argtype = 0; | |
2957 | register enum tree_code typecode = TREE_CODE (TREE_TYPE (arg)); | |
2958 | char *errstring = NULL; | |
2959 | tree val; | |
2960 | ||
2961 | if (typecode == ERROR_MARK) | |
2962 | return error_mark_node; | |
2963 | if (typecode == ENUMERAL_TYPE) | |
2964 | typecode = INTEGER_TYPE; | |
2965 | ||
2966 | switch (code) | |
2967 | { | |
2968 | case CONVERT_EXPR: | |
2969 | /* This is used for unary plus, because a CONVERT_EXPR | |
2970 | is enough to prevent anybody from looking inside for | |
2971 | associativity, but won't generate any code. */ | |
b6a10c9f RS |
2972 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2973 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2974 | errstring = "wrong type argument to unary plus"; |
2975 | else if (!noconvert) | |
2976 | arg = default_conversion (arg); | |
2977 | break; | |
2978 | ||
2979 | case NEGATE_EXPR: | |
b6a10c9f RS |
2980 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2981 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2982 | errstring = "wrong type argument to unary minus"; |
2983 | else if (!noconvert) | |
2984 | arg = default_conversion (arg); | |
2985 | break; | |
2986 | ||
2987 | case BIT_NOT_EXPR: | |
2988 | if (typecode != INTEGER_TYPE) | |
2989 | errstring = "wrong type argument to bit-complement"; | |
2990 | else if (!noconvert) | |
2991 | arg = default_conversion (arg); | |
2992 | break; | |
2993 | ||
2994 | case ABS_EXPR: | |
b6a10c9f RS |
2995 | if (!(typecode == INTEGER_TYPE || typecode == REAL_TYPE |
2996 | || typecode == COMPLEX_TYPE)) | |
400fbf9f JW |
2997 | errstring = "wrong type argument to abs"; |
2998 | else if (!noconvert) | |
2999 | arg = default_conversion (arg); | |
3000 | break; | |
3001 | ||
3002 | case TRUTH_NOT_EXPR: | |
3003 | if (typecode != INTEGER_TYPE | |
3004 | && typecode != REAL_TYPE && typecode != POINTER_TYPE | |
b6a10c9f | 3005 | && typecode != COMPLEX_TYPE |
400fbf9f JW |
3006 | /* These will convert to a pointer. */ |
3007 | && typecode != ARRAY_TYPE && typecode != FUNCTION_TYPE) | |
3008 | { | |
3009 | errstring = "wrong type argument to unary exclamation mark"; | |
3010 | break; | |
3011 | } | |
3012 | arg = truthvalue_conversion (arg); | |
3013 | return invert_truthvalue (arg); | |
3014 | ||
3015 | case NOP_EXPR: | |
3016 | break; | |
b6a10c9f RS |
3017 | |
3018 | case REALPART_EXPR: | |
3019 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3020 | return TREE_REALPART (arg); | |
3021 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
3022 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
3023 | else | |
3024 | return arg; | |
3025 | ||
3026 | case IMAGPART_EXPR: | |
3027 | if (TREE_CODE (arg) == COMPLEX_CST) | |
3028 | return TREE_IMAGPART (arg); | |
3029 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
3030 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
3031 | else | |
3032 | return convert (TREE_TYPE (arg), integer_zero_node); | |
400fbf9f JW |
3033 | |
3034 | case PREINCREMENT_EXPR: | |
3035 | case POSTINCREMENT_EXPR: | |
3036 | case PREDECREMENT_EXPR: | |
3037 | case POSTDECREMENT_EXPR: | |
3038 | /* Handle complex lvalues (when permitted) | |
3039 | by reduction to simpler cases. */ | |
3040 | ||
3041 | val = unary_complex_lvalue (code, arg); | |
3042 | if (val != 0) | |
3043 | return val; | |
3044 | ||
b6a10c9f RS |
3045 | /* Increment or decrement the real part of the value, |
3046 | and don't change the imaginary part. */ | |
3047 | if (typecode == COMPLEX_TYPE) | |
3048 | { | |
3049 | tree real, imag; | |
3050 | ||
3051 | arg = stabilize_reference (arg); | |
3052 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
3053 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
3054 | return build (COMPLEX_EXPR, TREE_TYPE (arg), | |
3055 | build_unary_op (code, real, 1), imag); | |
3056 | } | |
3057 | ||
400fbf9f JW |
3058 | /* Report invalid types. */ |
3059 | ||
3060 | if (typecode != POINTER_TYPE | |
3061 | && typecode != INTEGER_TYPE && typecode != REAL_TYPE) | |
3062 | { | |
3063 | if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
3064 | errstring ="wrong type argument to increment"; | |
3065 | else | |
3066 | errstring ="wrong type argument to decrement"; | |
3067 | break; | |
3068 | } | |
3069 | ||
3070 | { | |
3071 | register tree inc; | |
3072 | tree result_type = TREE_TYPE (arg); | |
3073 | ||
3074 | arg = get_unwidened (arg, 0); | |
3075 | argtype = TREE_TYPE (arg); | |
3076 | ||
3077 | /* Compute the increment. */ | |
3078 | ||
3079 | if (typecode == POINTER_TYPE) | |
3080 | { | |
6bc4e3d0 RS |
3081 | /* If pointer target is an undefined struct, |
3082 | we just cannot know how to do the arithmetic. */ | |
3083 | if (TYPE_SIZE (TREE_TYPE (result_type)) == 0) | |
3084 | error ("%s of pointer to unknown structure", | |
3085 | ((code == PREINCREMENT_EXPR | |
3086 | || code == POSTINCREMENT_EXPR) | |
3087 | ? "increment" : "decrement")); | |
3088 | else if ((pedantic || warn_pointer_arith) | |
3089 | && (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE | |
3090 | || TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)) | |
400fbf9f JW |
3091 | pedwarn ("wrong type argument to %s", |
3092 | ((code == PREINCREMENT_EXPR | |
3093 | || code == POSTINCREMENT_EXPR) | |
3094 | ? "increment" : "decrement")); | |
3095 | inc = c_sizeof_nowarn (TREE_TYPE (result_type)); | |
3096 | } | |
3097 | else | |
3098 | inc = integer_one_node; | |
3099 | ||
3100 | inc = convert (argtype, inc); | |
3101 | ||
3102 | /* Handle incrementing a cast-expression. */ | |
3103 | ||
3104 | while (1) | |
3105 | switch (TREE_CODE (arg)) | |
3106 | { | |
3107 | case NOP_EXPR: | |
3108 | case CONVERT_EXPR: | |
3109 | case FLOAT_EXPR: | |
3110 | case FIX_TRUNC_EXPR: | |
3111 | case FIX_FLOOR_EXPR: | |
3112 | case FIX_ROUND_EXPR: | |
3113 | case FIX_CEIL_EXPR: | |
ee71df46 | 3114 | pedantic_lvalue_warning (CONVERT_EXPR); |
400fbf9f JW |
3115 | /* If the real type has the same machine representation |
3116 | as the type it is cast to, we can make better output | |
3117 | by adding directly to the inside of the cast. */ | |
3118 | if ((TREE_CODE (TREE_TYPE (arg)) | |
3119 | == TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
3120 | && (TYPE_MODE (TREE_TYPE (arg)) | |
3121 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (arg, 0))))) | |
3122 | arg = TREE_OPERAND (arg, 0); | |
3123 | else | |
3124 | { | |
3125 | tree incremented, modify, value; | |
400fbf9f JW |
3126 | arg = stabilize_reference (arg); |
3127 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
3128 | value = arg; | |
3129 | else | |
3130 | value = save_expr (arg); | |
3131 | incremented = build (((code == PREINCREMENT_EXPR | |
3132 | || code == POSTINCREMENT_EXPR) | |
3133 | ? PLUS_EXPR : MINUS_EXPR), | |
3134 | argtype, value, inc); | |
3135 | TREE_SIDE_EFFECTS (incremented) = 1; | |
3136 | modify = build_modify_expr (arg, NOP_EXPR, incremented); | |
3137 | value = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); | |
3138 | TREE_USED (value) = 1; | |
3139 | return value; | |
3140 | } | |
3141 | break; | |
3142 | ||
3143 | default: | |
3144 | goto give_up; | |
3145 | } | |
3146 | give_up: | |
3147 | ||
3148 | /* Complain about anything else that is not a true lvalue. */ | |
3149 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
3150 | || code == POSTINCREMENT_EXPR) | |
3151 | ? "increment" : "decrement"))) | |
3152 | return error_mark_node; | |
3153 | ||
3154 | /* Report a read-only lvalue. */ | |
26b3c423 | 3155 | if (TREE_READONLY (arg)) |
400fbf9f JW |
3156 | readonly_warning (arg, |
3157 | ((code == PREINCREMENT_EXPR | |
3158 | || code == POSTINCREMENT_EXPR) | |
3159 | ? "increment" : "decrement")); | |
3160 | ||
3161 | val = build (code, TREE_TYPE (arg), arg, inc); | |
3162 | TREE_SIDE_EFFECTS (val) = 1; | |
3163 | val = convert (result_type, val); | |
3164 | if (TREE_CODE (val) != code) | |
3165 | TREE_NO_UNUSED_WARNING (val) = 1; | |
3166 | return val; | |
3167 | } | |
3168 | ||
3169 | case ADDR_EXPR: | |
3170 | /* Note that this operation never does default_conversion | |
3171 | regardless of NOCONVERT. */ | |
3172 | ||
3173 | /* Let &* cancel out to simplify resulting code. */ | |
3174 | if (TREE_CODE (arg) == INDIRECT_REF) | |
3175 | { | |
3176 | /* Don't let this be an lvalue. */ | |
3177 | if (lvalue_p (TREE_OPERAND (arg, 0))) | |
3178 | return non_lvalue (TREE_OPERAND (arg, 0)); | |
3179 | return TREE_OPERAND (arg, 0); | |
3180 | } | |
3181 | ||
3182 | /* For &x[y], return x+y */ | |
3183 | if (TREE_CODE (arg) == ARRAY_REF) | |
3184 | { | |
3185 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
3186 | return error_mark_node; | |
3187 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
3188 | TREE_OPERAND (arg, 1), 1); | |
3189 | } | |
3190 | ||
3191 | /* Handle complex lvalues (when permitted) | |
3192 | by reduction to simpler cases. */ | |
3193 | val = unary_complex_lvalue (code, arg); | |
3194 | if (val != 0) | |
3195 | return val; | |
3196 | ||
3197 | #if 0 /* Turned off because inconsistent; | |
3198 | float f; *&(int)f = 3.4 stores in int format | |
3199 | whereas (int)f = 3.4 stores in float format. */ | |
3200 | /* Address of a cast is just a cast of the address | |
3201 | of the operand of the cast. */ | |
3202 | switch (TREE_CODE (arg)) | |
3203 | { | |
3204 | case NOP_EXPR: | |
3205 | case CONVERT_EXPR: | |
3206 | case FLOAT_EXPR: | |
3207 | case FIX_TRUNC_EXPR: | |
3208 | case FIX_FLOOR_EXPR: | |
3209 | case FIX_ROUND_EXPR: | |
3210 | case FIX_CEIL_EXPR: | |
3211 | if (pedantic) | |
3212 | pedwarn ("ANSI C forbids the address of a cast expression"); | |
3213 | return convert (build_pointer_type (TREE_TYPE (arg)), | |
3214 | build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), | |
3215 | 0)); | |
3216 | } | |
3217 | #endif | |
3218 | ||
3219 | /* Allow the address of a constructor if all the elements | |
3220 | are constant. */ | |
3221 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
3222 | ; | |
3223 | /* Anything not already handled and not a true memory reference | |
3224 | is an error. */ | |
3225 | else if (typecode != FUNCTION_TYPE && !lvalue_or_else (arg, "unary `&'")) | |
3226 | return error_mark_node; | |
3227 | ||
3228 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
3229 | argtype = TREE_TYPE (arg); | |
3230 | /* If the lvalue is const or volatile, | |
3231 | merge that into the type that the address will point to. */ | |
3232 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
3233 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
3234 | { | |
3235 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
3236 | argtype = c_build_type_variant (argtype, | |
3237 | TREE_READONLY (arg), | |
3238 | TREE_THIS_VOLATILE (arg)); | |
3239 | } | |
3240 | ||
3241 | argtype = build_pointer_type (argtype); | |
3242 | ||
3243 | if (mark_addressable (arg) == 0) | |
3244 | return error_mark_node; | |
3245 | ||
3246 | { | |
3247 | tree addr; | |
3248 | ||
3249 | if (TREE_CODE (arg) == COMPONENT_REF) | |
3250 | { | |
3251 | tree field = TREE_OPERAND (arg, 1); | |
3252 | ||
3253 | addr = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3254 | ||
3255 | if (DECL_BIT_FIELD (field)) | |
3256 | { | |
3257 | error ("attempt to take address of bit-field structure member `%s'", | |
3258 | IDENTIFIER_POINTER (DECL_NAME (field))); | |
3259 | return error_mark_node; | |
3260 | } | |
3261 | ||
3262 | addr = convert (argtype, addr); | |
3263 | ||
3264 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
3265 | { | |
3266 | tree offset | |
3267 | = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
3268 | size_int (BITS_PER_UNIT)); | |
3269 | int flag = TREE_CONSTANT (addr); | |
3270 | addr = fold (build (PLUS_EXPR, argtype, | |
3271 | addr, convert (argtype, offset))); | |
3272 | TREE_CONSTANT (addr) = flag; | |
3273 | } | |
3274 | } | |
3275 | else | |
3276 | addr = build1 (code, argtype, arg); | |
3277 | ||
3278 | /* Address of a static or external variable or | |
8706edbc RS |
3279 | file-scope function counts as a constant. */ |
3280 | if (staticp (arg) | |
3281 | && ! (TREE_CODE (arg) == FUNCTION_DECL | |
3282 | && DECL_CONTEXT (arg) != 0)) | |
7d2d49af | 3283 | TREE_CONSTANT (addr) = 1; |
400fbf9f JW |
3284 | return addr; |
3285 | } | |
3286 | } | |
3287 | ||
3288 | if (!errstring) | |
3289 | { | |
3290 | if (argtype == 0) | |
3291 | argtype = TREE_TYPE (arg); | |
3292 | return fold (build1 (code, argtype, arg)); | |
3293 | } | |
3294 | ||
3295 | error (errstring); | |
3296 | return error_mark_node; | |
3297 | } | |
3298 | ||
3299 | #if 0 | |
3300 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, | |
3301 | convert ARG with the same conversions in the same order | |
3302 | and return the result. */ | |
3303 | ||
3304 | static tree | |
3305 | convert_sequence (conversions, arg) | |
3306 | tree conversions; | |
3307 | tree arg; | |
3308 | { | |
3309 | switch (TREE_CODE (conversions)) | |
3310 | { | |
3311 | case NOP_EXPR: | |
3312 | case CONVERT_EXPR: | |
3313 | case FLOAT_EXPR: | |
3314 | case FIX_TRUNC_EXPR: | |
3315 | case FIX_FLOOR_EXPR: | |
3316 | case FIX_ROUND_EXPR: | |
3317 | case FIX_CEIL_EXPR: | |
3318 | return convert (TREE_TYPE (conversions), | |
3319 | convert_sequence (TREE_OPERAND (conversions, 0), | |
3320 | arg)); | |
3321 | ||
3322 | default: | |
3323 | return arg; | |
3324 | } | |
3325 | } | |
3326 | #endif /* 0 */ | |
3327 | ||
3328 | /* Return nonzero if REF is an lvalue valid for this language. | |
3329 | Lvalues can be assigned, unless their type has TYPE_READONLY. | |
1394aabd | 3330 | Lvalues can have their address taken, unless they have DECL_REGISTER. */ |
400fbf9f JW |
3331 | |
3332 | int | |
3333 | lvalue_p (ref) | |
3334 | tree ref; | |
3335 | { | |
3336 | register enum tree_code code = TREE_CODE (ref); | |
3337 | ||
3338 | switch (code) | |
3339 | { | |
b6a10c9f RS |
3340 | case REALPART_EXPR: |
3341 | case IMAGPART_EXPR: | |
400fbf9f JW |
3342 | case COMPONENT_REF: |
3343 | return lvalue_p (TREE_OPERAND (ref, 0)); | |
3344 | ||
3345 | case STRING_CST: | |
3346 | return 1; | |
3347 | ||
3348 | case INDIRECT_REF: | |
3349 | case ARRAY_REF: | |
3350 | case VAR_DECL: | |
3351 | case PARM_DECL: | |
3352 | case RESULT_DECL: | |
3353 | case ERROR_MARK: | |
3354 | if (TREE_CODE (TREE_TYPE (ref)) != FUNCTION_TYPE | |
3355 | && TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE) | |
3356 | return 1; | |
3357 | break; | |
3358 | } | |
3359 | return 0; | |
3360 | } | |
3361 | ||
3362 | /* Return nonzero if REF is an lvalue valid for this language; | |
3363 | otherwise, print an error message and return zero. */ | |
3364 | ||
3365 | int | |
3366 | lvalue_or_else (ref, string) | |
3367 | tree ref; | |
3368 | char *string; | |
3369 | { | |
3370 | int win = lvalue_p (ref); | |
3371 | if (! win) | |
3372 | error ("invalid lvalue in %s", string); | |
3373 | return win; | |
3374 | } | |
3375 | ||
3376 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
3377 | for certain kinds of expressions which are not really lvalues | |
3378 | but which we can accept as lvalues. | |
3379 | ||
3380 | If ARG is not a kind of expression we can handle, return zero. */ | |
3381 | ||
3382 | static tree | |
3383 | unary_complex_lvalue (code, arg) | |
3384 | enum tree_code code; | |
3385 | tree arg; | |
3386 | { | |
3387 | /* Handle (a, b) used as an "lvalue". */ | |
3388 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
3389 | { | |
3390 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
3391 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
3392 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), | |
3393 | TREE_OPERAND (arg, 0), real_result); | |
3394 | } | |
3395 | ||
3396 | /* Handle (a ? b : c) used as an "lvalue". */ | |
3397 | if (TREE_CODE (arg) == COND_EXPR) | |
3398 | { | |
3399 | pedantic_lvalue_warning (COND_EXPR); | |
3400 | return (build_conditional_expr | |
3401 | (TREE_OPERAND (arg, 0), | |
3402 | build_unary_op (code, TREE_OPERAND (arg, 1), 0), | |
3403 | build_unary_op (code, TREE_OPERAND (arg, 2), 0))); | |
3404 | } | |
3405 | ||
3406 | return 0; | |
3407 | } | |
3408 | ||
3409 | /* If pedantic, warn about improper lvalue. CODE is either COND_EXPR | |
3410 | COMPOUND_EXPR, or CONVERT_EXPR (for casts). */ | |
3411 | ||
3412 | static void | |
3413 | pedantic_lvalue_warning (code) | |
3414 | enum tree_code code; | |
3415 | { | |
3416 | if (pedantic) | |
3417 | pedwarn ("ANSI C forbids use of %s expressions as lvalues", | |
3418 | code == COND_EXPR ? "conditional" | |
3419 | : code == COMPOUND_EXPR ? "compound" : "cast"); | |
3420 | } | |
3421 | \f | |
3422 | /* Warn about storing in something that is `const'. */ | |
3423 | ||
3424 | void | |
3425 | readonly_warning (arg, string) | |
3426 | tree arg; | |
3427 | char *string; | |
3428 | { | |
3429 | char buf[80]; | |
3430 | strcpy (buf, string); | |
3431 | ||
3791970d RS |
3432 | /* Forbid assignments to iterators. */ |
3433 | if (TREE_CODE (TREE_OPERAND (arg, 0)) == VAR_DECL | |
3434 | && ITERATOR_P (TREE_OPERAND (arg, 0))) | |
3435 | { | |
3436 | strcat (buf, " of iterator `%s'"); | |
3437 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1)))); | |
3438 | } | |
3439 | ||
400fbf9f JW |
3440 | if (TREE_CODE (arg) == COMPONENT_REF) |
3441 | { | |
3442 | if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
3443 | readonly_warning (TREE_OPERAND (arg, 0), string); | |
3444 | else | |
3445 | { | |
3446 | strcat (buf, " of read-only member `%s'"); | |
3447 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (arg, 1)))); | |
3448 | } | |
3449 | } | |
3450 | else if (TREE_CODE (arg) == VAR_DECL) | |
3451 | { | |
3452 | strcat (buf, " of read-only variable `%s'"); | |
3453 | pedwarn (buf, IDENTIFIER_POINTER (DECL_NAME (arg))); | |
3454 | } | |
3455 | else | |
3456 | { | |
3457 | pedwarn ("%s of read-only location", buf); | |
3458 | } | |
3459 | } | |
3460 | \f | |
3461 | /* Mark EXP saying that we need to be able to take the | |
3462 | address of it; it should not be allocated in a register. | |
3463 | Value is 1 if successful. */ | |
3464 | ||
3465 | int | |
3466 | mark_addressable (exp) | |
3467 | tree exp; | |
3468 | { | |
3469 | register tree x = exp; | |
3470 | while (1) | |
3471 | switch (TREE_CODE (x)) | |
3472 | { | |
3473 | case ADDR_EXPR: | |
3474 | case COMPONENT_REF: | |
3475 | case ARRAY_REF: | |
3476 | x = TREE_OPERAND (x, 0); | |
3477 | break; | |
3478 | ||
3479 | case CONSTRUCTOR: | |
3480 | TREE_ADDRESSABLE (x) = 1; | |
3481 | return 1; | |
3482 | ||
3483 | case VAR_DECL: | |
3484 | case CONST_DECL: | |
3485 | case PARM_DECL: | |
3486 | case RESULT_DECL: | |
1394aabd RS |
3487 | if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
3488 | && DECL_NONLOCAL (x)) | |
4bb6d2f8 RS |
3489 | { |
3490 | if (TREE_PUBLIC (x)) | |
3491 | { | |
3492 | error ("global register variable `%s' used in nested function", | |
3493 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3494 | return 0; | |
3495 | } | |
3496 | pedwarn ("register variable `%s' used in nested function", | |
3497 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3498 | } | |
1394aabd | 3499 | else if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x)) |
400fbf9f JW |
3500 | { |
3501 | if (TREE_PUBLIC (x)) | |
3502 | { | |
3503 | error ("address of global register variable `%s' requested", | |
3504 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3505 | return 0; | |
3506 | } | |
3507 | pedwarn ("address of register variable `%s' requested", | |
3508 | IDENTIFIER_POINTER (DECL_NAME (x))); | |
3509 | } | |
3510 | put_var_into_stack (x); | |
3511 | ||
3512 | /* drops in */ | |
3513 | case FUNCTION_DECL: | |
3514 | TREE_ADDRESSABLE (x) = 1; | |
3515 | #if 0 /* poplevel deals with this now. */ | |
3516 | if (DECL_CONTEXT (x) == 0) | |
3517 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
3518 | #endif | |
3519 | ||
3520 | default: | |
3521 | return 1; | |
3522 | } | |
3523 | } | |
3524 | \f | |
3525 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
3526 | ||
3527 | tree | |
3528 | build_conditional_expr (ifexp, op1, op2) | |
3529 | tree ifexp, op1, op2; | |
3530 | { | |
3531 | register tree type1; | |
3532 | register tree type2; | |
3533 | register enum tree_code code1; | |
3534 | register enum tree_code code2; | |
3535 | register tree result_type = NULL; | |
3536 | ||
3537 | /* If second operand is omitted, it is the same as the first one; | |
3538 | make sure it is calculated only once. */ | |
3539 | if (op1 == 0) | |
3540 | { | |
3541 | if (pedantic) | |
3542 | pedwarn ("ANSI C forbids omitting the middle term of a ?: expression"); | |
3543 | ifexp = op1 = save_expr (ifexp); | |
3544 | } | |
3545 | ||
3546 | ifexp = truthvalue_conversion (default_conversion (ifexp)); | |
3547 | ||
3548 | if (TREE_CODE (ifexp) == ERROR_MARK | |
3549 | || TREE_CODE (TREE_TYPE (op1)) == ERROR_MARK | |
3550 | || TREE_CODE (TREE_TYPE (op2)) == ERROR_MARK) | |
3551 | return error_mark_node; | |
3552 | ||
3553 | #if 0 /* Produces wrong result if within sizeof. */ | |
3554 | /* Don't promote the operands separately if they promote | |
3555 | the same way. Return the unpromoted type and let the combined | |
3556 | value get promoted if necessary. */ | |
3557 | ||
3558 | if (TREE_TYPE (op1) == TREE_TYPE (op2) | |
3559 | && TREE_CODE (TREE_TYPE (op1)) != ARRAY_TYPE | |
3560 | && TREE_CODE (TREE_TYPE (op1)) != ENUMERAL_TYPE | |
3561 | && TREE_CODE (TREE_TYPE (op1)) != FUNCTION_TYPE) | |
3562 | { | |
3563 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
3564 | return (integer_zerop (ifexp) ? op2 : op1); | |
3565 | ||
3566 | return fold (build (COND_EXPR, TREE_TYPE (op1), ifexp, op1, op2)); | |
3567 | } | |
3568 | #endif | |
3569 | ||
3570 | /* They don't match; promote them both and then try to reconcile them. */ | |
3571 | ||
3572 | if (TREE_CODE (TREE_TYPE (op1)) != VOID_TYPE) | |
3573 | op1 = default_conversion (op1); | |
3574 | if (TREE_CODE (TREE_TYPE (op2)) != VOID_TYPE) | |
3575 | op2 = default_conversion (op2); | |
3576 | ||
3577 | type1 = TREE_TYPE (op1); | |
3578 | code1 = TREE_CODE (type1); | |
3579 | type2 = TREE_TYPE (op2); | |
3580 | code2 = TREE_CODE (type2); | |
3581 | ||
3582 | /* Quickly detect the usual case where op1 and op2 have the same type | |
3583 | after promotion. */ | |
1ad409d2 RS |
3584 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
3585 | { | |
3586 | if (type1 == type2) | |
3587 | result_type = type1; | |
3588 | else | |
3589 | result_type = TYPE_MAIN_VARIANT (type1); | |
3590 | } | |
400fbf9f JW |
3591 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) |
3592 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
3593 | { | |
3594 | result_type = common_type (type1, type2); | |
3595 | } | |
3596 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
3597 | { | |
3598 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
3599 | pedwarn ("ANSI C forbids conditional expr with only one void side"); | |
3600 | result_type = void_type_node; | |
3601 | } | |
3602 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
3603 | { | |
3604 | if (comp_target_types (type1, type2)) | |
3605 | result_type = common_type (type1, type2); | |
3606 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node) | |
3607 | result_type = qualify_type (type2, type1); | |
3608 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node) | |
3609 | result_type = qualify_type (type1, type2); | |
3610 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) | |
3611 | { | |
3612 | if (pedantic && TREE_CODE (TREE_TYPE (type2)) == FUNCTION_TYPE) | |
3613 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3614 | result_type = qualify_type (type1, type2); | |
3615 | } | |
3616 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
3617 | { | |
3618 | if (pedantic && TREE_CODE (TREE_TYPE (type1)) == FUNCTION_TYPE) | |
3619 | pedwarn ("ANSI C forbids conditional expr between `void *' and function pointer"); | |
3620 | result_type = qualify_type (type2, type1); | |
3621 | } | |
3622 | else | |
3623 | { | |
3624 | pedwarn ("pointer type mismatch in conditional expression"); | |
3625 | result_type = build_pointer_type (void_type_node); | |
3626 | } | |
3627 | } | |
3628 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
3629 | { | |
3630 | if (! integer_zerop (op2)) | |
3631 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3632 | else | |
3633 | { | |
3634 | op2 = null_pointer_node; | |
3635 | #if 0 /* The spec seems to say this is permitted. */ | |
3636 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
3637 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3638 | #endif | |
3639 | } | |
3640 | result_type = type1; | |
3641 | } | |
3642 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3643 | { | |
3644 | if (!integer_zerop (op1)) | |
3645 | pedwarn ("pointer/integer type mismatch in conditional expression"); | |
3646 | else | |
3647 | { | |
3648 | op1 = null_pointer_node; | |
3649 | #if 0 /* The spec seems to say this is permitted. */ | |
3650 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
3651 | pedwarn ("ANSI C forbids conditional expr between 0 and function pointer"); | |
3652 | #endif | |
3653 | } | |
3654 | result_type = type2; | |
3655 | } | |
3656 | ||
3657 | if (!result_type) | |
3658 | { | |
3659 | if (flag_cond_mismatch) | |
3660 | result_type = void_type_node; | |
3661 | else | |
3662 | { | |
3663 | error ("type mismatch in conditional expression"); | |
3664 | return error_mark_node; | |
3665 | } | |
3666 | } | |
3667 | ||
1dfdf85d RS |
3668 | /* Merge const and volatile flags of the incoming types. */ |
3669 | result_type | |
3670 | = build_type_variant (result_type, | |
48c73063 RS |
3671 | TREE_READONLY (op1) || TREE_READONLY (op2), |
3672 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
e58cd767 | 3673 | |
400fbf9f | 3674 | if (result_type != TREE_TYPE (op1)) |
e58cd767 | 3675 | op1 = convert_and_check (result_type, op1); |
400fbf9f | 3676 | if (result_type != TREE_TYPE (op2)) |
e58cd767 | 3677 | op2 = convert_and_check (result_type, op2); |
400fbf9f JW |
3678 | |
3679 | #if 0 | |
3680 | if (code1 == RECORD_TYPE || code1 == UNION_TYPE) | |
3681 | { | |
3682 | result_type = TREE_TYPE (op1); | |
3683 | if (TREE_CONSTANT (ifexp)) | |
3684 | return (integer_zerop (ifexp) ? op2 : op1); | |
3685 | ||
3686 | if (TYPE_MODE (result_type) == BLKmode) | |
3687 | { | |
3688 | register tree tempvar | |
3689 | = build_decl (VAR_DECL, NULL_TREE, result_type); | |
3690 | register tree xop1 = build_modify_expr (tempvar, op1); | |
3691 | register tree xop2 = build_modify_expr (tempvar, op2); | |
3692 | register tree result = fold (build (COND_EXPR, result_type, | |
3693 | ifexp, xop1, xop2)); | |
3694 | ||
3695 | layout_decl (tempvar, TYPE_ALIGN (result_type)); | |
3696 | /* No way to handle variable-sized objects here. | |
3697 | I fear that the entire handling of BLKmode conditional exprs | |
3698 | needs to be redone. */ | |
3699 | if (TREE_CODE (DECL_SIZE (tempvar)) != INTEGER_CST) | |
3700 | abort (); | |
3701 | DECL_RTL (tempvar) | |
3702 | = assign_stack_local (DECL_MODE (tempvar), | |
3703 | (TREE_INT_CST_LOW (DECL_SIZE (tempvar)) | |
3704 | + BITS_PER_UNIT - 1) | |
3705 | / BITS_PER_UNIT, | |
3706 | 0); | |
3707 | ||
3708 | TREE_SIDE_EFFECTS (result) | |
3709 | = TREE_SIDE_EFFECTS (ifexp) | TREE_SIDE_EFFECTS (op1) | |
3710 | | TREE_SIDE_EFFECTS (op2); | |
3711 | return build (COMPOUND_EXPR, result_type, result, tempvar); | |
3712 | } | |
3713 | } | |
3714 | #endif /* 0 */ | |
5abb45f2 RS |
3715 | |
3716 | if (TREE_CODE (ifexp) == INTEGER_CST) | |
3717 | return integer_zerop (ifexp) ? op2 : op1; | |
400fbf9f | 3718 | |
400fbf9f JW |
3719 | return fold (build (COND_EXPR, result_type, ifexp, op1, op2)); |
3720 | } | |
3721 | \f | |
3722 | /* Given a list of expressions, return a compound expression | |
3723 | that performs them all and returns the value of the last of them. */ | |
3724 | ||
3725 | tree | |
3726 | build_compound_expr (list) | |
3727 | tree list; | |
82bde854 | 3728 | { |
43a5a542 | 3729 | return internal_build_compound_expr (list, TRUE); |
82bde854 MM |
3730 | } |
3731 | ||
3732 | static tree | |
3733 | internal_build_compound_expr (list, first_p) | |
3734 | tree list; | |
3735 | int first_p; | |
400fbf9f JW |
3736 | { |
3737 | register tree rest; | |
3738 | ||
3739 | if (TREE_CHAIN (list) == 0) | |
3740 | { | |
6dc42e49 | 3741 | #if 0 /* If something inside inhibited lvalueness, we should not override. */ |
400fbf9f JW |
3742 | /* Consider (x, y+0), which is not an lvalue since y+0 is not. */ |
3743 | ||
3744 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3745 | if (TREE_CODE (list) == NON_LVALUE_EXPR) | |
3746 | list = TREE_OPERAND (list, 0); | |
3747 | #endif | |
3748 | ||
439f6027 | 3749 | /* Don't let (0, 0) be null pointer constant. */ |
82bde854 | 3750 | if (!first_p && integer_zerop (TREE_VALUE (list))) |
439f6027 RS |
3751 | return non_lvalue (TREE_VALUE (list)); |
3752 | return TREE_VALUE (list); | |
400fbf9f JW |
3753 | } |
3754 | ||
3755 | if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0) | |
3756 | { | |
3757 | /* Convert arrays to pointers when there really is a comma operator. */ | |
3758 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (list)))) == ARRAY_TYPE) | |
3759 | TREE_VALUE (TREE_CHAIN (list)) | |
3760 | = default_conversion (TREE_VALUE (TREE_CHAIN (list))); | |
3761 | } | |
3762 | ||
82bde854 | 3763 | rest = internal_build_compound_expr (TREE_CHAIN (list), FALSE); |
400fbf9f JW |
3764 | |
3765 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) | |
3766 | return rest; | |
3767 | ||
3768 | return build (COMPOUND_EXPR, TREE_TYPE (rest), TREE_VALUE (list), rest); | |
3769 | } | |
3770 | ||
3771 | /* Build an expression representing a cast to type TYPE of expression EXPR. */ | |
3772 | ||
3773 | tree | |
3774 | build_c_cast (type, expr) | |
3775 | register tree type; | |
3776 | tree expr; | |
3777 | { | |
3778 | register tree value = expr; | |
3779 | ||
3780 | if (type == error_mark_node || expr == error_mark_node) | |
3781 | return error_mark_node; | |
3782 | type = TYPE_MAIN_VARIANT (type); | |
3783 | ||
3784 | #if 0 | |
3785 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
3786 | if (TREE_CODE (value) == NON_LVALUE_EXPR) | |
3787 | value = TREE_OPERAND (value, 0); | |
3788 | #endif | |
3789 | ||
3790 | if (TREE_CODE (type) == ARRAY_TYPE) | |
3791 | { | |
3792 | error ("cast specifies array type"); | |
3793 | return error_mark_node; | |
3794 | } | |
3795 | ||
3796 | if (TREE_CODE (type) == FUNCTION_TYPE) | |
3797 | { | |
3798 | error ("cast specifies function type"); | |
3799 | return error_mark_node; | |
3800 | } | |
3801 | ||
3802 | if (type == TREE_TYPE (value)) | |
3803 | { | |
3804 | if (pedantic) | |
3805 | { | |
3806 | if (TREE_CODE (type) == RECORD_TYPE | |
3807 | || TREE_CODE (type) == UNION_TYPE) | |
3808 | pedwarn ("ANSI C forbids casting nonscalar to the same type"); | |
3809 | } | |
3810 | } | |
3811 | else if (TREE_CODE (type) == UNION_TYPE) | |
3812 | { | |
3813 | tree field; | |
3814 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
3815 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (field)), | |
3816 | TYPE_MAIN_VARIANT (TREE_TYPE (value)))) | |
3817 | break; | |
3818 | ||
3819 | if (field) | |
3820 | { | |
805f961c RS |
3821 | char *name; |
3822 | tree nvalue; | |
3823 | ||
400fbf9f JW |
3824 | if (pedantic) |
3825 | pedwarn ("ANSI C forbids casts to union type"); | |
805f961c RS |
3826 | if (TYPE_NAME (type) != 0) |
3827 | { | |
3828 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
3829 | name = IDENTIFIER_POINTER (TYPE_NAME (type)); | |
3830 | else | |
3831 | name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
3832 | } | |
3833 | else | |
3834 | name = ""; | |
3835 | return digest_init (type, build_nt (CONSTRUCTOR, NULL_TREE, | |
3836 | build_tree_list (field, value)), | |
8d9bfdc5 | 3837 | NULL_PTR, 0, 0, name); |
400fbf9f JW |
3838 | } |
3839 | error ("cast to union type from type not present in union"); | |
3840 | return error_mark_node; | |
3841 | } | |
3842 | else | |
3843 | { | |
3844 | tree otype; | |
53b01f59 RS |
3845 | |
3846 | /* If casting to void, avoid the error that would come | |
3847 | from default_conversion in the case of a non-lvalue array. */ | |
3848 | if (type == void_type_node) | |
3849 | return build1 (CONVERT_EXPR, type, value); | |
3850 | ||
400fbf9f JW |
3851 | /* Convert functions and arrays to pointers, |
3852 | but don't convert any other types. */ | |
3853 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
3854 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE) | |
3855 | value = default_conversion (value); | |
3856 | otype = TREE_TYPE (value); | |
3857 | ||
d45cf215 | 3858 | /* Optionally warn about potentially worrisome casts. */ |
400fbf9f JW |
3859 | |
3860 | if (warn_cast_qual | |
3861 | && TREE_CODE (type) == POINTER_TYPE | |
3862 | && TREE_CODE (otype) == POINTER_TYPE) | |
3863 | { | |
3864 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
3865 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
3866 | pedwarn ("cast discards `volatile' from pointer target type"); | |
3867 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
3868 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
3869 | pedwarn ("cast discards `const' from pointer target type"); | |
3870 | } | |
3871 | ||
3872 | /* Warn about possible alignment problems. */ | |
d45cf215 | 3873 | if (STRICT_ALIGNMENT && warn_cast_align |
400fbf9f JW |
3874 | && TREE_CODE (type) == POINTER_TYPE |
3875 | && TREE_CODE (otype) == POINTER_TYPE | |
3876 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
3877 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
3878 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
3879 | warning ("cast increases required alignment of target type"); | |
400fbf9f JW |
3880 | |
3881 | if (TREE_CODE (type) == INTEGER_TYPE | |
3882 | && TREE_CODE (otype) == POINTER_TYPE | |
c9b7f31c RS |
3883 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
3884 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3885 | warning ("cast from pointer to integer of different size"); |
3886 | ||
3887 | if (TREE_CODE (type) == POINTER_TYPE | |
3888 | && TREE_CODE (otype) == INTEGER_TYPE | |
2918ed3c | 3889 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) |
c9b7f31c | 3890 | #if 0 |
2918ed3c RS |
3891 | /* Don't warn about converting 0 to pointer, |
3892 | provided the 0 was explicit--not cast or made by folding. */ | |
c9b7f31c RS |
3893 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value)) |
3894 | #endif | |
3895 | /* Don't warn about converting any constant. */ | |
3896 | && !TREE_CONSTANT (value)) | |
400fbf9f JW |
3897 | warning ("cast to pointer from integer of different size"); |
3898 | ||
3899 | value = convert (type, value); | |
e58cd767 RS |
3900 | |
3901 | /* Ignore any integer overflow caused by the cast. */ | |
3902 | if (TREE_CODE (value) == INTEGER_CST) | |
3903 | TREE_CONSTANT_OVERFLOW (value) = 0; | |
400fbf9f JW |
3904 | } |
3905 | ||
3906 | if (value == expr && pedantic) | |
3907 | { | |
3908 | /* If pedantic, don't let a cast be an lvalue. */ | |
3909 | return non_lvalue (value); | |
3910 | } | |
3911 | return value; | |
3912 | } | |
3913 | \f | |
3914 | /* Build an assignment expression of lvalue LHS from value RHS. | |
3915 | MODIFYCODE is the code for a binary operator that we use | |
3916 | to combine the old value of LHS with RHS to get the new value. | |
3917 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. */ | |
3918 | ||
3919 | tree | |
3920 | build_modify_expr (lhs, modifycode, rhs) | |
3921 | tree lhs, rhs; | |
3922 | enum tree_code modifycode; | |
3923 | { | |
3924 | register tree result; | |
3925 | tree newrhs; | |
3926 | tree lhstype = TREE_TYPE (lhs); | |
3927 | tree olhstype = lhstype; | |
3928 | ||
3929 | /* Types that aren't fully specified cannot be used in assignments. */ | |
3930 | lhs = require_complete_type (lhs); | |
3931 | ||
3932 | /* Avoid duplicate error messages from operands that had errors. */ | |
3933 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
3934 | return error_mark_node; | |
3935 | ||
3936 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
3937 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
3938 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
3939 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
3940 | rhs = TREE_OPERAND (rhs, 0); | |
3941 | ||
3942 | newrhs = rhs; | |
3943 | ||
3944 | /* Handle control structure constructs used as "lvalues". */ | |
3945 | ||
3946 | switch (TREE_CODE (lhs)) | |
3947 | { | |
3948 | /* Handle (a, b) used as an "lvalue". */ | |
3949 | case COMPOUND_EXPR: | |
3950 | pedantic_lvalue_warning (COMPOUND_EXPR); | |
3951 | return build (COMPOUND_EXPR, lhstype, | |
3952 | TREE_OPERAND (lhs, 0), | |
3953 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
3954 | modifycode, rhs)); | |
3955 | ||
3956 | /* Handle (a ? b : c) used as an "lvalue". */ | |
3957 | case COND_EXPR: | |
3958 | pedantic_lvalue_warning (COND_EXPR); | |
3959 | rhs = save_expr (rhs); | |
3960 | { | |
3961 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
3962 | except that the RHS goes through a save-expr | |
3963 | so the code to compute it is only emitted once. */ | |
3964 | tree cond | |
3965 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
3966 | build_modify_expr (TREE_OPERAND (lhs, 1), | |
3967 | modifycode, rhs), | |
3968 | build_modify_expr (TREE_OPERAND (lhs, 2), | |
3969 | modifycode, rhs)); | |
3970 | /* Make sure the code to compute the rhs comes out | |
3971 | before the split. */ | |
3972 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
3973 | /* But cast it to void to avoid an "unused" error. */ | |
3974 | convert (void_type_node, rhs), cond); | |
3975 | } | |
3976 | } | |
3977 | ||
3978 | /* If a binary op has been requested, combine the old LHS value with the RHS | |
3979 | producing the value we should actually store into the LHS. */ | |
3980 | ||
3981 | if (modifycode != NOP_EXPR) | |
3982 | { | |
3983 | lhs = stabilize_reference (lhs); | |
3984 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
3985 | } | |
3986 | ||
3987 | /* Handle a cast used as an "lvalue". | |
3988 | We have already performed any binary operator using the value as cast. | |
3989 | Now convert the result to the cast type of the lhs, | |
3990 | and then true type of the lhs and store it there; | |
3991 | then convert result back to the cast type to be the value | |
3992 | of the assignment. */ | |
3993 | ||
3994 | switch (TREE_CODE (lhs)) | |
3995 | { | |
3996 | case NOP_EXPR: | |
3997 | case CONVERT_EXPR: | |
3998 | case FLOAT_EXPR: | |
3999 | case FIX_TRUNC_EXPR: | |
4000 | case FIX_FLOOR_EXPR: | |
4001 | case FIX_ROUND_EXPR: | |
4002 | case FIX_CEIL_EXPR: | |
4003 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
4004 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE) | |
4005 | newrhs = default_conversion (newrhs); | |
4006 | { | |
4007 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
4008 | tree result; | |
4009 | result = build_modify_expr (inner_lhs, NOP_EXPR, | |
4010 | convert (TREE_TYPE (inner_lhs), | |
4011 | convert (lhstype, newrhs))); | |
4012 | pedantic_lvalue_warning (CONVERT_EXPR); | |
4013 | return convert (TREE_TYPE (lhs), result); | |
4014 | } | |
4015 | } | |
4016 | ||
4017 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
4018 | Reject anything strange now. */ | |
4019 | ||
4020 | if (!lvalue_or_else (lhs, "assignment")) | |
4021 | return error_mark_node; | |
4022 | ||
4023 | /* Warn about storing in something that is `const'. */ | |
4024 | ||
4025 | if (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
4026 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
4027 | || TREE_CODE (lhstype) == UNION_TYPE) | |
4028 | && C_TYPE_FIELDS_READONLY (lhstype))) | |
4029 | readonly_warning (lhs, "assignment"); | |
4030 | ||
4031 | /* If storing into a structure or union member, | |
4032 | it has probably been given type `int'. | |
4033 | Compute the type that would go with | |
4034 | the actual amount of storage the member occupies. */ | |
4035 | ||
4036 | if (TREE_CODE (lhs) == COMPONENT_REF | |
4037 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
4038 | || TREE_CODE (lhstype) == REAL_TYPE | |
4039 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
4040 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
4041 | ||
4042 | /* If storing in a field that is in actuality a short or narrower than one, | |
4043 | we must store in the field in its actual type. */ | |
4044 | ||
4045 | if (lhstype != TREE_TYPE (lhs)) | |
4046 | { | |
4047 | lhs = copy_node (lhs); | |
4048 | TREE_TYPE (lhs) = lhstype; | |
4049 | } | |
4050 | ||
4051 | /* Convert new value to destination type. */ | |
4052 | ||
4053 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
9b7267b8 | 4054 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
4055 | if (TREE_CODE (newrhs) == ERROR_MARK) |
4056 | return error_mark_node; | |
4057 | ||
4058 | result = build (MODIFY_EXPR, lhstype, lhs, newrhs); | |
4059 | TREE_SIDE_EFFECTS (result) = 1; | |
4060 | ||
4061 | /* If we got the LHS in a different type for storing in, | |
4062 | convert the result back to the nominal type of LHS | |
4063 | so that the value we return always has the same type | |
4064 | as the LHS argument. */ | |
4065 | ||
4066 | if (olhstype == TREE_TYPE (result)) | |
4067 | return result; | |
9b7267b8 RS |
4068 | return convert_for_assignment (olhstype, result, "assignment", |
4069 | NULL_TREE, NULL_TREE, 0); | |
400fbf9f JW |
4070 | } |
4071 | \f | |
4072 | /* Convert value RHS to type TYPE as preparation for an assignment | |
4073 | to an lvalue of type TYPE. | |
4074 | The real work of conversion is done by `convert'. | |
4075 | The purpose of this function is to generate error messages | |
4076 | for assignments that are not allowed in C. | |
4077 | ERRTYPE is a string to use in error messages: | |
4078 | "assignment", "return", etc. If it is null, this is parameter passing | |
d45cf215 RS |
4079 | for a function call (and different error messages are output). Otherwise, |
4080 | it may be a name stored in the spelling stack and interpreted by | |
4081 | get_spelling. | |
400fbf9f JW |
4082 | |
4083 | FUNNAME is the name of the function being called, | |
4084 | as an IDENTIFIER_NODE, or null. | |
4085 | PARMNUM is the number of the argument, for printing in error messages. */ | |
4086 | ||
4087 | static tree | |
9b7267b8 | 4088 | convert_for_assignment (type, rhs, errtype, fundecl, funname, parmnum) |
400fbf9f JW |
4089 | tree type, rhs; |
4090 | char *errtype; | |
9b7267b8 | 4091 | tree fundecl, funname; |
400fbf9f JW |
4092 | int parmnum; |
4093 | { | |
4094 | register enum tree_code codel = TREE_CODE (type); | |
4095 | register tree rhstype; | |
4096 | register enum tree_code coder; | |
4097 | ||
4098 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4099 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4100 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f JW |
4101 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) |
4102 | rhs = TREE_OPERAND (rhs, 0); | |
4103 | ||
4104 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
4105 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE) | |
4106 | rhs = default_conversion (rhs); | |
4107 | ||
4108 | rhstype = TREE_TYPE (rhs); | |
4109 | coder = TREE_CODE (rhstype); | |
4110 | ||
4111 | if (coder == ERROR_MARK) | |
4112 | return error_mark_node; | |
4113 | ||
4114 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
e58cd767 RS |
4115 | { |
4116 | overflow_warning (rhs); | |
4117 | return rhs; | |
4118 | } | |
400fbf9f JW |
4119 | |
4120 | if (coder == VOID_TYPE) | |
4121 | { | |
4122 | error ("void value not ignored as it ought to be"); | |
4123 | return error_mark_node; | |
4124 | } | |
4125 | /* Arithmetic types all interconvert, and enum is treated like int. */ | |
b6a10c9f RS |
4126 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == ENUMERAL_TYPE |
4127 | || codel == COMPLEX_TYPE) | |
400fbf9f | 4128 | && |
b6a10c9f RS |
4129 | (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == ENUMERAL_TYPE |
4130 | || codel == COMPLEX_TYPE)) | |
e58cd767 | 4131 | return convert_and_check (type, rhs); |
9b7267b8 | 4132 | /* Conversion to a union from its member types. */ |
db9e5545 | 4133 | else if (codel == UNION_TYPE) |
9b7267b8 RS |
4134 | { |
4135 | tree memb_types; | |
4136 | for (memb_types = TYPE_FIELDS (type); memb_types; | |
4137 | memb_types = TREE_CHAIN (memb_types)) | |
4138 | { | |
4139 | if (comptypes (TREE_TYPE (memb_types), TREE_TYPE (rhs))) | |
4140 | { | |
4141 | if (pedantic | |
4142 | && !(fundecl != 0 && DECL_IN_SYSTEM_HEADER (fundecl))) | |
4143 | pedwarn ("ANSI C prohibits argument conversion to union type"); | |
4144 | return build1 (NOP_EXPR, type, rhs); | |
4145 | } | |
4146 | } | |
4147 | } | |
400fbf9f JW |
4148 | /* Conversions among pointers */ |
4149 | else if (codel == POINTER_TYPE && coder == POINTER_TYPE) | |
4150 | { | |
4151 | register tree ttl = TREE_TYPE (type); | |
4152 | register tree ttr = TREE_TYPE (rhstype); | |
4153 | ||
4154 | /* Any non-function converts to a [const][volatile] void * | |
4155 | and vice versa; otherwise, targets must be the same. | |
4156 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
4157 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4158 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4159 | || comp_target_types (type, rhstype) | |
4160 | || (!pedantic /* Unless pedantic, mix signed and unsigned. */ | |
4161 | && TREE_CODE (ttl) == INTEGER_TYPE | |
4162 | && TREE_CODE (ttr) == INTEGER_TYPE | |
4163 | && TYPE_PRECISION (ttl) == TYPE_PRECISION (ttr))) | |
4164 | { | |
4165 | if (pedantic | |
4166 | && ((TYPE_MAIN_VARIANT (ttl) == void_type_node | |
4167 | && TREE_CODE (ttr) == FUNCTION_TYPE) | |
4168 | || | |
4169 | (TYPE_MAIN_VARIANT (ttr) == void_type_node | |
4170 | && !integer_zerop (rhs) | |
4171 | && TREE_CODE (ttl) == FUNCTION_TYPE))) | |
4172 | warn_for_assignment ("ANSI forbids %s between function pointer and `void *'", | |
d45cf215 | 4173 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4174 | /* Const and volatile mean something different for function types, |
4175 | so the usual warnings are not appropriate. */ | |
4176 | else if (TREE_CODE (ttr) != FUNCTION_TYPE | |
4177 | || TREE_CODE (ttl) != FUNCTION_TYPE) | |
4178 | { | |
4179 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
4180 | warn_for_assignment ("%s discards `const' from pointer target type", | |
d45cf215 | 4181 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4182 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
4183 | warn_for_assignment ("%s discards `volatile' from pointer target type", | |
d45cf215 | 4184 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4185 | } |
4186 | else | |
4187 | { | |
4188 | /* Because const and volatile on functions are restrictions | |
4189 | that say the function will not do certain things, | |
4190 | it is okay to use a const or volatile function | |
4191 | where an ordinary one is wanted, but not vice-versa. */ | |
4192 | if (TYPE_READONLY (ttl) && ! TYPE_READONLY (ttr)) | |
4193 | warn_for_assignment ("%s makes `const *' function pointer from non-const", | |
d45cf215 | 4194 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4195 | if (TYPE_VOLATILE (ttl) && ! TYPE_VOLATILE (ttr)) |
4196 | warn_for_assignment ("%s makes `volatile *' function pointer from non-volatile", | |
d45cf215 | 4197 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4198 | } |
4199 | } | |
4200 | else if (unsigned_type (TYPE_MAIN_VARIANT (ttl)) | |
4201 | == unsigned_type (TYPE_MAIN_VARIANT (ttr))) | |
4202 | warn_for_assignment ("pointer targets in %s differ in signedness", | |
d45cf215 | 4203 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4204 | else |
4205 | warn_for_assignment ("%s from incompatible pointer type", | |
d45cf215 | 4206 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4207 | return convert (type, rhs); |
4208 | } | |
4209 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
4210 | { | |
2918ed3c RS |
4211 | /* An explicit constant 0 can convert to a pointer, |
4212 | but not a 0 that results from casting or folding. */ | |
4213 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) | |
400fbf9f JW |
4214 | { |
4215 | warn_for_assignment ("%s makes pointer from integer without a cast", | |
d45cf215 | 4216 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4217 | return convert (type, rhs); |
4218 | } | |
4219 | return null_pointer_node; | |
4220 | } | |
4221 | else if (codel == INTEGER_TYPE && coder == POINTER_TYPE) | |
4222 | { | |
4223 | warn_for_assignment ("%s makes integer from pointer without a cast", | |
d45cf215 | 4224 | get_spelling (errtype), funname, parmnum); |
400fbf9f JW |
4225 | return convert (type, rhs); |
4226 | } | |
4227 | ||
4228 | if (!errtype) | |
4229 | { | |
4230 | if (funname) | |
4231 | error ("incompatible type for argument %d of `%s'", | |
4232 | parmnum, IDENTIFIER_POINTER (funname)); | |
4233 | else | |
4234 | error ("incompatible type for argument %d of indirect function call", | |
4235 | parmnum); | |
4236 | } | |
4237 | else | |
d45cf215 | 4238 | error ("incompatible types in %s", get_spelling (errtype)); |
400fbf9f JW |
4239 | |
4240 | return error_mark_node; | |
4241 | } | |
4242 | ||
4243 | /* Print a warning using MSG. | |
4244 | It gets OPNAME as its one parameter. | |
4245 | If OPNAME is null, it is replaced by "passing arg ARGNUM of `FUNCTION'". | |
4246 | FUNCTION and ARGNUM are handled specially if we are building an | |
4247 | Objective-C selector. */ | |
4248 | ||
4249 | static void | |
4250 | warn_for_assignment (msg, opname, function, argnum) | |
4251 | char *msg; | |
4252 | char *opname; | |
4253 | tree function; | |
4254 | int argnum; | |
4255 | { | |
4256 | static char argstring[] = "passing arg %d of `%s'"; | |
4257 | static char argnofun[] = "passing arg %d"; | |
4258 | ||
4259 | if (opname == 0) | |
4260 | { | |
4261 | tree selector = maybe_building_objc_message_expr (); | |
4262 | ||
4263 | if (selector && argnum > 2) | |
4264 | { | |
4265 | function = selector; | |
4266 | argnum -= 2; | |
4267 | } | |
4268 | if (function) | |
4269 | { | |
4270 | /* Function name is known; supply it. */ | |
4271 | opname = (char *) alloca (IDENTIFIER_LENGTH (function) | |
4272 | + sizeof (argstring) + 25 /*%d*/ + 1); | |
4273 | sprintf (opname, argstring, argnum, IDENTIFIER_POINTER (function)); | |
4274 | } | |
4275 | else | |
4276 | { | |
4277 | /* Function name unknown (call through ptr); just give arg number. */ | |
4278 | opname = (char *) alloca (sizeof (argnofun) + 25 /*%d*/ + 1); | |
4279 | sprintf (opname, argnofun, argnum); | |
4280 | } | |
4281 | } | |
4282 | pedwarn (msg, opname); | |
4283 | } | |
4284 | \f | |
4285 | /* Return nonzero if VALUE is a valid constant-valued expression | |
4286 | for use in initializing a static variable; one that can be an | |
4287 | element of a "constant" initializer. | |
4288 | ||
4289 | Return null_pointer_node if the value is absolute; | |
4290 | if it is relocatable, return the variable that determines the relocation. | |
4291 | We assume that VALUE has been folded as much as possible; | |
4292 | therefore, we do not need to check for such things as | |
4293 | arithmetic-combinations of integers. */ | |
4294 | ||
4295 | static tree | |
f0c70ef0 | 4296 | initializer_constant_valid_p (value, endtype) |
400fbf9f | 4297 | tree value; |
f0c70ef0 | 4298 | tree endtype; |
400fbf9f JW |
4299 | { |
4300 | switch (TREE_CODE (value)) | |
4301 | { | |
4302 | case CONSTRUCTOR: | |
4303 | return TREE_STATIC (value) ? null_pointer_node : 0; | |
4304 | ||
4305 | case INTEGER_CST: | |
4306 | case REAL_CST: | |
4307 | case STRING_CST: | |
466e9220 | 4308 | case COMPLEX_CST: |
400fbf9f JW |
4309 | return null_pointer_node; |
4310 | ||
4311 | case ADDR_EXPR: | |
4312 | return TREE_OPERAND (value, 0); | |
4313 | ||
4314 | case NON_LVALUE_EXPR: | |
f0c70ef0 | 4315 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4316 | |
4317 | case CONVERT_EXPR: | |
4318 | case NOP_EXPR: | |
4319 | /* Allow conversions between pointer types. */ | |
4320 | if (TREE_CODE (TREE_TYPE (value)) == POINTER_TYPE | |
4321 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE) | |
f0c70ef0 | 4322 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4323 | /* Allow conversions between real types. */ |
4324 | if (TREE_CODE (TREE_TYPE (value)) == REAL_TYPE | |
4325 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == REAL_TYPE) | |
f0c70ef0 | 4326 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4327 | /* Allow length-preserving conversions between integer types. */ |
4328 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE | |
4329 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE | |
4330 | && tree_int_cst_equal (TYPE_SIZE (TREE_TYPE (value)), | |
4331 | TYPE_SIZE (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 | 4332 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype); |
400fbf9f JW |
4333 | /* Allow conversions between integer types only if explicit value. */ |
4334 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE | |
4335 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == INTEGER_TYPE) | |
4336 | { | |
f0c70ef0 RS |
4337 | tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4338 | endtype); | |
400fbf9f JW |
4339 | if (inner == null_pointer_node) |
4340 | return null_pointer_node; | |
4341 | return 0; | |
4342 | } | |
9b7267b8 | 4343 | /* Allow (int) &foo provided int is as wide as a pointer. */ |
400fbf9f JW |
4344 | if (TREE_CODE (TREE_TYPE (value)) == INTEGER_TYPE |
4345 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (value, 0))) == POINTER_TYPE | |
9b7267b8 RS |
4346 | && ! tree_int_cst_lt (TYPE_SIZE (TREE_TYPE (value)), |
4347 | TYPE_SIZE (TREE_TYPE (TREE_OPERAND (value, 0))))) | |
f0c70ef0 RS |
4348 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4349 | endtype); | |
805f961c RS |
4350 | /* Allow conversions to union types if the value inside is okay. */ |
4351 | if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE) | |
f0c70ef0 RS |
4352 | return initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4353 | endtype); | |
400fbf9f JW |
4354 | return 0; |
4355 | ||
4356 | case PLUS_EXPR: | |
1bbe9280 RS |
4357 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4358 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4359 | return 0; |
400fbf9f | 4360 | { |
f0c70ef0 RS |
4361 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4362 | endtype); | |
4363 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4364 | endtype); | |
400fbf9f JW |
4365 | /* If either term is absolute, use the other terms relocation. */ |
4366 | if (valid0 == null_pointer_node) | |
4367 | return valid1; | |
4368 | if (valid1 == null_pointer_node) | |
4369 | return valid0; | |
4370 | return 0; | |
4371 | } | |
4372 | ||
4373 | case MINUS_EXPR: | |
1bbe9280 RS |
4374 | if (TREE_CODE (endtype) == INTEGER_TYPE |
4375 | && TYPE_PRECISION (endtype) < POINTER_SIZE) | |
f0c70ef0 | 4376 | return 0; |
400fbf9f | 4377 | { |
f0c70ef0 RS |
4378 | tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0), |
4379 | endtype); | |
4380 | tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1), | |
4381 | endtype); | |
400fbf9f JW |
4382 | /* Win if second argument is absolute. */ |
4383 | if (valid1 == null_pointer_node) | |
4384 | return valid0; | |
4385 | /* Win if both arguments have the same relocation. | |
4386 | Then the value is absolute. */ | |
4387 | if (valid0 == valid1) | |
4388 | return null_pointer_node; | |
4389 | return 0; | |
4390 | } | |
4391 | } | |
4392 | ||
4393 | return 0; | |
4394 | } | |
4395 | \f | |
4396 | /* Perform appropriate conversions on the initial value of a variable, | |
4397 | store it in the declaration DECL, | |
4398 | and print any error messages that are appropriate. | |
4399 | If the init is invalid, store an ERROR_MARK. */ | |
4400 | ||
4401 | void | |
4402 | store_init_value (decl, init) | |
4403 | tree decl, init; | |
4404 | { | |
4405 | register tree value, type; | |
4406 | ||
4407 | /* If variable's type was invalidly declared, just ignore it. */ | |
4408 | ||
4409 | type = TREE_TYPE (decl); | |
4410 | if (TREE_CODE (type) == ERROR_MARK) | |
4411 | return; | |
4412 | ||
4413 | /* Digest the specified initializer into an expression. */ | |
4414 | ||
8d9bfdc5 | 4415 | value = digest_init (type, init, NULL_PTR, TREE_STATIC (decl), |
400fbf9f JW |
4416 | TREE_STATIC (decl) || pedantic, |
4417 | IDENTIFIER_POINTER (DECL_NAME (decl))); | |
4418 | ||
4419 | /* Store the expression if valid; else report error. */ | |
4420 | ||
4421 | #if 0 | |
4422 | /* Note that this is the only place we can detect the error | |
4423 | in a case such as struct foo bar = (struct foo) { x, y }; | |
d45cf215 | 4424 | where there is one initial value which is a constructor expression. */ |
400fbf9f JW |
4425 | if (value == error_mark_node) |
4426 | ; | |
4427 | else if (TREE_STATIC (decl) && ! TREE_CONSTANT (value)) | |
4428 | { | |
4429 | error ("initializer for static variable is not constant"); | |
4430 | value = error_mark_node; | |
4431 | } | |
4432 | else if (TREE_STATIC (decl) | |
f0c70ef0 | 4433 | && initializer_constant_valid_p (value, TREE_TYPE (value)) == 0) |
400fbf9f JW |
4434 | { |
4435 | error ("initializer for static variable uses complicated arithmetic"); | |
4436 | value = error_mark_node; | |
4437 | } | |
4438 | else | |
4439 | { | |
4440 | if (pedantic && TREE_CODE (value) == CONSTRUCTOR) | |
4441 | { | |
4442 | if (! TREE_CONSTANT (value)) | |
4443 | pedwarn ("aggregate initializer is not constant"); | |
4444 | else if (! TREE_STATIC (value)) | |
4445 | pedwarn ("aggregate initializer uses complicated arithmetic"); | |
4446 | } | |
4447 | } | |
4448 | #endif | |
4449 | ||
26b3c423 RS |
4450 | /* ANSI wants warnings about out-of-range constant initializers. */ |
4451 | constant_expression_warning (value); | |
4452 | ||
400fbf9f JW |
4453 | DECL_INITIAL (decl) = value; |
4454 | } | |
4455 | \f | |
075fc632 | 4456 | /* Methods for storing and printing names for error messages. */ |
d45cf215 RS |
4457 | |
4458 | /* Implement a spelling stack that allows components of a name to be pushed | |
4459 | and popped. Each element on the stack is this structure. */ | |
4460 | ||
4461 | struct spelling | |
4462 | { | |
4463 | int kind; | |
4464 | union | |
4465 | { | |
4466 | int i; | |
4467 | char *s; | |
4468 | } u; | |
4469 | }; | |
4470 | ||
4471 | #define SPELLING_STRING 1 | |
4472 | #define SPELLING_MEMBER 2 | |
4473 | #define SPELLING_BOUNDS 3 | |
4474 | ||
4475 | static struct spelling *spelling; /* Next stack element (unused). */ | |
4476 | static struct spelling *spelling_base; /* Spelling stack base. */ | |
4477 | static int spelling_size; /* Size of the spelling stack. */ | |
4478 | ||
4479 | /* Macros to save and restore the spelling stack around push_... functions. | |
4480 | Alternative to SAVE_SPELLING_STACK. */ | |
4481 | ||
4482 | #define SPELLING_DEPTH() (spelling - spelling_base) | |
4483 | #define RESTORE_SPELLING_DEPTH(depth) (spelling = spelling_base + depth) | |
4484 | ||
4485 | /* Save and restore the spelling stack around arbitrary C code. */ | |
4486 | ||
4487 | #define SAVE_SPELLING_DEPTH(code) \ | |
4488 | { \ | |
4489 | int __depth = SPELLING_DEPTH (); \ | |
4490 | code; \ | |
4491 | RESTORE_SPELLING_DEPTH (__depth); \ | |
4492 | } | |
4493 | ||
4494 | /* Push an element on the spelling stack with type KIND and assign VALUE | |
4495 | to MEMBER. */ | |
4496 | ||
4497 | #define PUSH_SPELLING(KIND, VALUE, MEMBER) \ | |
4498 | { \ | |
4499 | int depth = SPELLING_DEPTH (); \ | |
4500 | \ | |
4501 | if (depth >= spelling_size) \ | |
4502 | { \ | |
4503 | spelling_size += 10; \ | |
4504 | if (spelling_base == 0) \ | |
4505 | spelling_base \ | |
4506 | = (struct spelling *) xmalloc (spelling_size * sizeof (struct spelling)); \ | |
4507 | else \ | |
4508 | spelling_base \ | |
4509 | = (struct spelling *) xrealloc (spelling_base, \ | |
4510 | spelling_size * sizeof (struct spelling)); \ | |
4511 | RESTORE_SPELLING_DEPTH (depth); \ | |
4512 | } \ | |
4513 | \ | |
4514 | spelling->kind = (KIND); \ | |
4515 | spelling->MEMBER = (VALUE); \ | |
4516 | spelling++; \ | |
4517 | } | |
4518 | ||
4519 | /* Push STRING on the stack. Printed literally. */ | |
4520 | ||
4521 | static void | |
4522 | push_string (string) | |
4523 | char *string; | |
4524 | { | |
4525 | PUSH_SPELLING (SPELLING_STRING, string, u.s); | |
4526 | } | |
4527 | ||
4528 | /* Push a member name on the stack. Printed as '.' STRING. */ | |
4529 | ||
4530 | static void | |
4531 | push_member_name (string) | |
4532 | char *string; | |
4533 | { | |
4534 | PUSH_SPELLING (SPELLING_MEMBER, string, u.s); | |
4535 | } | |
4536 | ||
4537 | /* Push an array bounds on the stack. Printed as [BOUNDS]. */ | |
4538 | ||
4539 | static void | |
4540 | push_array_bounds (bounds) | |
4541 | int bounds; | |
4542 | { | |
4543 | PUSH_SPELLING (SPELLING_BOUNDS, bounds, u.i); | |
4544 | } | |
4545 | ||
4546 | /* Compute the maximum size in bytes of the printed spelling. */ | |
4547 | ||
4548 | static int | |
4549 | spelling_length () | |
4550 | { | |
4551 | register int size = 0; | |
4552 | register struct spelling *p; | |
4553 | ||
4554 | for (p = spelling_base; p < spelling; p++) | |
4555 | { | |
4556 | if (p->kind == SPELLING_BOUNDS) | |
4557 | size += 25; | |
4558 | else | |
4559 | size += strlen (p->u.s) + 1; | |
4560 | } | |
4561 | ||
4562 | return size; | |
4563 | } | |
4564 | ||
4565 | /* Print the spelling to BUFFER and return it. */ | |
4566 | ||
4567 | static char * | |
4568 | print_spelling (buffer) | |
4569 | register char *buffer; | |
4570 | { | |
4571 | register char *d = buffer; | |
4572 | register char *s; | |
4573 | register struct spelling *p; | |
4574 | ||
4575 | for (p = spelling_base; p < spelling; p++) | |
4576 | if (p->kind == SPELLING_BOUNDS) | |
4577 | { | |
4578 | sprintf (d, "[%d]", p->u.i); | |
4579 | d += strlen (d); | |
4580 | } | |
4581 | else | |
4582 | { | |
4583 | if (p->kind == SPELLING_MEMBER) | |
4584 | *d++ = '.'; | |
4585 | for (s = p->u.s; *d = *s++; d++) | |
4586 | ; | |
4587 | } | |
4588 | *d++ = '\0'; | |
4589 | return buffer; | |
4590 | } | |
4591 | ||
4592 | /* Provide a means to pass component names derived from the spelling stack. */ | |
4593 | ||
4594 | char initialization_message; | |
4595 | ||
4596 | /* Interpret the spelling of the given ERRTYPE message. */ | |
4597 | ||
4598 | static char * | |
4599 | get_spelling (errtype) | |
4600 | char *errtype; | |
4601 | { | |
4602 | static char *buffer; | |
4603 | static int size = -1; | |
4604 | ||
4605 | if (errtype == &initialization_message) | |
4606 | { | |
4607 | /* Avoid counting chars */ | |
4608 | static char message[] = "initialization of `%s'"; | |
4609 | register int needed = sizeof (message) + spelling_length () + 1; | |
047de90b | 4610 | char *temp; |
d45cf215 RS |
4611 | |
4612 | if (size < 0) | |
4613 | buffer = (char *) xmalloc (size = needed); | |
4614 | if (needed > size) | |
4615 | buffer = (char *) xrealloc (buffer, size = needed); | |
4616 | ||
047de90b RS |
4617 | temp = (char *) alloca (needed); |
4618 | sprintf (buffer, message, print_spelling (temp)); | |
d45cf215 RS |
4619 | return buffer; |
4620 | } | |
4621 | ||
4622 | return errtype; | |
4623 | } | |
4624 | ||
400fbf9f JW |
4625 | /* Issue an error message for a bad initializer component. |
4626 | FORMAT describes the message. OFWHAT is the name for the component. | |
4627 | LOCAL is a format string for formatting the insertion of the name | |
4628 | into the message. | |
4629 | ||
d45cf215 | 4630 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4631 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4632 | |
4633 | void | |
4634 | error_init (format, local, ofwhat) | |
4635 | char *format, *local, *ofwhat; | |
4636 | { | |
d45cf215 RS |
4637 | char *buffer; |
4638 | ||
4639 | if (ofwhat == 0) | |
4640 | ofwhat = print_spelling (alloca (spelling_length () + 1)); | |
4641 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); | |
400fbf9f JW |
4642 | |
4643 | if (*ofwhat) | |
4644 | sprintf (buffer, local, ofwhat); | |
4645 | else | |
4646 | buffer[0] = 0; | |
4647 | ||
4648 | error (format, buffer); | |
4649 | } | |
4650 | ||
4651 | /* Issue a pedantic warning for a bad initializer component. | |
4652 | FORMAT describes the message. OFWHAT is the name for the component. | |
4653 | LOCAL is a format string for formatting the insertion of the name | |
4654 | into the message. | |
4655 | ||
d45cf215 | 4656 | If OFWHAT is null, the component name is stored on the spelling stack. |
6dc42e49 | 4657 | If the component name is a null string, then LOCAL is omitted entirely. */ |
400fbf9f JW |
4658 | |
4659 | void | |
4660 | pedwarn_init (format, local, ofwhat) | |
4661 | char *format, *local, *ofwhat; | |
4662 | { | |
d45cf215 RS |
4663 | char *buffer; |
4664 | ||
4665 | if (ofwhat == 0) | |
4666 | ofwhat = print_spelling (alloca (spelling_length () + 1)); | |
4667 | buffer = (char *) alloca (strlen (local) + strlen (ofwhat) + 2); | |
400fbf9f JW |
4668 | |
4669 | if (*ofwhat) | |
4670 | sprintf (buffer, local, ofwhat); | |
4671 | else | |
4672 | buffer[0] = 0; | |
4673 | ||
4674 | pedwarn (format, buffer); | |
4675 | } | |
4676 | \f | |
4677 | /* Digest the parser output INIT as an initializer for type TYPE. | |
4678 | Return a C expression of type TYPE to represent the initial value. | |
4679 | ||
4680 | If TAIL is nonzero, it points to a variable holding a list of elements | |
4681 | of which INIT is the first. We update the list stored there by | |
4682 | removing from the head all the elements that we use. | |
4683 | Normally this is only one; we use more than one element only if | |
4684 | TYPE is an aggregate and INIT is not a constructor. | |
4685 | ||
4686 | The arguments REQUIRE_CONSTANT and CONSTRUCTOR_CONSTANT request errors | |
4687 | if non-constant initializers or elements are seen. CONSTRUCTOR_CONSTANT | |
4688 | applies only to elements of constructors. | |
4689 | ||
d45cf215 RS |
4690 | If OFWHAT is nonnull, it specifies what we are initializing, for error |
4691 | messages. Examples: variable name, variable.member, array[44]. | |
4692 | If OFWHAT is null, the component name is stored on the spelling stack. */ | |
400fbf9f JW |
4693 | |
4694 | tree | |
4695 | digest_init (type, init, tail, require_constant, constructor_constant, ofwhat) | |
4696 | tree type, init, *tail; | |
4697 | int require_constant, constructor_constant; | |
4698 | char *ofwhat; | |
4699 | { | |
4700 | enum tree_code code = TREE_CODE (type); | |
4701 | tree element = 0; | |
4702 | tree old_tail_contents; | |
400fbf9f JW |
4703 | /* Nonzero if INIT is a braced grouping, which comes in as a CONSTRUCTOR |
4704 | tree node which has no TREE_TYPE. */ | |
4705 | int raw_constructor | |
4706 | = TREE_CODE (init) == CONSTRUCTOR && TREE_TYPE (init) == 0; | |
047de90b | 4707 | tree inside_init = init; |
400fbf9f JW |
4708 | |
4709 | /* By default, assume we use one element from a list. | |
4710 | We correct this later in the sole case where it is not true. */ | |
4711 | ||
4712 | if (tail) | |
4713 | { | |
4714 | old_tail_contents = *tail; | |
4715 | *tail = TREE_CHAIN (*tail); | |
4716 | } | |
4717 | ||
4718 | if (init == error_mark_node) | |
4719 | return init; | |
4720 | ||
4721 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fc76e425 RS |
4722 | /* Do not use STRIP_NOPS here. We do not want an enumerator |
4723 | whose value is 0 to count as a null pointer constant. */ | |
400fbf9f | 4724 | if (TREE_CODE (init) == NON_LVALUE_EXPR) |
047de90b | 4725 | inside_init = TREE_OPERAND (init, 0); |
400fbf9f | 4726 | |
cdc54cc9 | 4727 | if (inside_init && raw_constructor |
047de90b RS |
4728 | && CONSTRUCTOR_ELTS (inside_init) != 0 |
4729 | && TREE_CHAIN (CONSTRUCTOR_ELTS (inside_init)) == 0) | |
400fbf9f | 4730 | { |
047de90b | 4731 | element = TREE_VALUE (CONSTRUCTOR_ELTS (inside_init)); |
400fbf9f JW |
4732 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ |
4733 | if (element && TREE_CODE (element) == NON_LVALUE_EXPR) | |
4734 | element = TREE_OPERAND (element, 0); | |
4735 | } | |
4736 | ||
4737 | /* Initialization of an array of chars from a string constant | |
4738 | optionally enclosed in braces. */ | |
4739 | ||
4740 | if (code == ARRAY_TYPE) | |
4741 | { | |
4742 | tree typ1 = TYPE_MAIN_VARIANT (TREE_TYPE (type)); | |
4743 | if ((typ1 == char_type_node | |
4744 | || typ1 == signed_char_type_node | |
4745 | || typ1 == unsigned_char_type_node | |
4746 | || typ1 == unsigned_wchar_type_node | |
4747 | || typ1 == signed_wchar_type_node) | |
047de90b | 4748 | && ((inside_init && TREE_CODE (inside_init) == STRING_CST) |
400fbf9f JW |
4749 | || (element && TREE_CODE (element) == STRING_CST))) |
4750 | { | |
047de90b | 4751 | tree string = element ? element : inside_init; |
400fbf9f JW |
4752 | |
4753 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) | |
4754 | != char_type_node) | |
4755 | && TYPE_PRECISION (typ1) == TYPE_PRECISION (char_type_node)) | |
4756 | { | |
4757 | error_init ("char-array%s initialized from wide string", | |
4758 | " `%s'", ofwhat); | |
4759 | return error_mark_node; | |
4760 | } | |
4761 | if ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (string))) | |
4762 | == char_type_node) | |
4763 | && TYPE_PRECISION (typ1) != TYPE_PRECISION (char_type_node)) | |
4764 | { | |
4765 | error_init ("int-array%s initialized from non-wide string", | |
4766 | " `%s'", ofwhat); | |
4767 | return error_mark_node; | |
4768 | } | |
4769 | ||
4770 | TREE_TYPE (string) = type; | |
4771 | if (TYPE_DOMAIN (type) != 0 | |
4772 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST) | |
4773 | { | |
4774 | register int size = TREE_INT_CST_LOW (TYPE_SIZE (type)); | |
4775 | size = (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT; | |
4776 | /* Subtract 1 because it's ok to ignore the terminating null char | |
4777 | that is counted in the length of the constant. */ | |
4778 | if (size < TREE_STRING_LENGTH (string) - 1) | |
4779 | pedwarn_init ( | |
4780 | "initializer-string for array of chars%s is too long", | |
4781 | " `%s'", ofwhat); | |
4782 | } | |
4783 | return string; | |
4784 | } | |
4785 | } | |
4786 | ||
4787 | /* Any type except an array can be initialized | |
4788 | from an expression of the same type, optionally with braces. | |
4789 | For an array, this is allowed only for a string constant. */ | |
4790 | ||
2726966d RS |
4791 | if (inside_init && TREE_TYPE (inside_init) != 0 |
4792 | && ((TYPE_MAIN_VARIANT (TREE_TYPE (inside_init)) | |
b39a6d43 | 4793 | == TYPE_MAIN_VARIANT (type)) |
2726966d | 4794 | || (code == ARRAY_TYPE |
3c3fa147 RS |
4795 | && comptypes (TREE_TYPE (inside_init), type)) |
4796 | || (code == POINTER_TYPE | |
3c3fa147 RS |
4797 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4798 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE) | |
4799 | && comptypes (TREE_TYPE (TREE_TYPE (inside_init)), | |
4800 | TREE_TYPE (type))))) | |
400fbf9f JW |
4801 | { |
4802 | if (code == POINTER_TYPE | |
047de90b RS |
4803 | && (TREE_CODE (TREE_TYPE (inside_init)) == ARRAY_TYPE |
4804 | || TREE_CODE (TREE_TYPE (inside_init)) == FUNCTION_TYPE)) | |
4805 | inside_init = default_conversion (inside_init); | |
4806 | else if (code == ARRAY_TYPE && TREE_CODE (inside_init) != STRING_CST) | |
400fbf9f JW |
4807 | { |
4808 | error_init ("array%s initialized from non-constant array expression", | |
4809 | " `%s'", ofwhat); | |
4810 | return error_mark_node; | |
4811 | } | |
4812 | ||
047de90b RS |
4813 | if (optimize && TREE_READONLY (inside_init) |
4814 | && TREE_CODE (inside_init) == VAR_DECL) | |
4815 | inside_init = decl_constant_value (inside_init); | |
400fbf9f | 4816 | |
047de90b | 4817 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f JW |
4818 | { |
4819 | error_init ("initializer element%s is not constant", | |
4820 | " for `%s'", ofwhat); | |
047de90b | 4821 | inside_init = error_mark_node; |
400fbf9f | 4822 | } |
f0c70ef0 RS |
4823 | else if (require_constant |
4824 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
4825 | { |
4826 | error_init ("initializer element%s is not computable at load time", | |
4827 | " for `%s'", ofwhat); | |
047de90b | 4828 | inside_init = error_mark_node; |
400fbf9f JW |
4829 | } |
4830 | ||
047de90b | 4831 | return inside_init; |
400fbf9f JW |
4832 | } |
4833 | ||
4834 | if (element && (TREE_TYPE (element) == type | |
4835 | || (code == ARRAY_TYPE && TREE_TYPE (element) | |
4836 | && comptypes (TREE_TYPE (element), type)))) | |
4837 | { | |
4838 | if (code == ARRAY_TYPE) | |
4839 | { | |
4840 | error_init ("array%s initialized from non-constant array expression", | |
4841 | " `%s'", ofwhat); | |
4842 | return error_mark_node; | |
4843 | } | |
4844 | if (pedantic && (code == RECORD_TYPE || code == UNION_TYPE)) | |
4845 | pedwarn ("single-expression nonscalar initializer has braces"); | |
4846 | if (optimize && TREE_READONLY (element) && TREE_CODE (element) == VAR_DECL) | |
4847 | element = decl_constant_value (element); | |
4848 | ||
4849 | if (require_constant && ! TREE_CONSTANT (element)) | |
4850 | { | |
4851 | error_init ("initializer element%s is not constant", | |
4852 | " for `%s'", ofwhat); | |
4853 | element = error_mark_node; | |
4854 | } | |
f0c70ef0 RS |
4855 | else if (require_constant |
4856 | && initializer_constant_valid_p (element, TREE_TYPE (element)) == 0) | |
400fbf9f JW |
4857 | { |
4858 | error_init ("initializer element%s is not computable at load time", | |
4859 | " for `%s'", ofwhat); | |
4860 | element = error_mark_node; | |
4861 | } | |
4862 | ||
4863 | return element; | |
4864 | } | |
4865 | ||
4866 | /* Check for initializing a union by its first field. | |
4867 | Such an initializer must use braces. */ | |
4868 | ||
4869 | if (code == UNION_TYPE) | |
4870 | { | |
4871 | tree result; | |
4872 | tree field = TYPE_FIELDS (type); | |
4873 | ||
4874 | /* Find the first named field. ANSI decided in September 1990 | |
4875 | that only named fields count here. */ | |
4876 | while (field && DECL_NAME (field) == 0) | |
4877 | field = TREE_CHAIN (field); | |
4878 | ||
4879 | if (field == 0) | |
4880 | { | |
4881 | error_init ("union%s with no named members cannot be initialized", | |
4882 | " `%s'", ofwhat); | |
4883 | return error_mark_node; | |
4884 | } | |
4885 | ||
805f961c | 4886 | if (raw_constructor) |
8d9bfdc5 | 4887 | result = process_init_constructor (type, inside_init, NULL_PTR, |
805f961c RS |
4888 | require_constant, |
4889 | constructor_constant, ofwhat); | |
4890 | else if (tail != 0) | |
4891 | { | |
4892 | *tail = old_tail_contents; | |
8d9bfdc5 | 4893 | result = process_init_constructor (type, NULL_TREE, tail, |
805f961c RS |
4894 | require_constant, |
4895 | constructor_constant, ofwhat); | |
4896 | } | |
4897 | else | |
4898 | result = 0; | |
400fbf9f | 4899 | |
d45cf215 RS |
4900 | if (result) |
4901 | return result; | |
400fbf9f JW |
4902 | } |
4903 | ||
4904 | /* Handle scalar types, including conversions. */ | |
4905 | ||
4906 | if (code == INTEGER_TYPE || code == REAL_TYPE || code == POINTER_TYPE | |
337633f9 | 4907 | || code == ENUMERAL_TYPE || code == COMPLEX_TYPE) |
400fbf9f JW |
4908 | { |
4909 | if (raw_constructor) | |
4910 | { | |
4911 | if (element == 0) | |
4912 | { | |
4913 | error_init ( | |
4914 | "initializer for scalar%s requires one element", | |
4915 | " `%s'", ofwhat); | |
4916 | return error_mark_node; | |
4917 | } | |
1394aabd RS |
4918 | else |
4919 | { | |
4920 | /* Deal with extra levels of {...}. */ | |
4921 | if (TREE_CODE (element) == CONSTRUCTOR | |
4922 | && TREE_TYPE (element) == 0) | |
4923 | { | |
4924 | error_init ( | |
4925 | "initializer for scalar%s requires one element", | |
4926 | " `%s'", ofwhat); | |
4927 | return error_mark_node; | |
4928 | } | |
4929 | inside_init = element; | |
4930 | } | |
400fbf9f JW |
4931 | } |
4932 | ||
4933 | #if 0 /* A non-raw constructor is an actual expression. */ | |
047de90b | 4934 | if (TREE_CODE (inside_init) == CONSTRUCTOR) |
400fbf9f JW |
4935 | { |
4936 | error_init ("initializer for scalar%s has extra braces", | |
4937 | " `%s'", ofwhat); | |
4938 | return error_mark_node; | |
4939 | } | |
4940 | #endif | |
4941 | ||
d45cf215 RS |
4942 | SAVE_SPELLING_DEPTH |
4943 | ({ | |
4944 | if (ofwhat) | |
4945 | push_string (ofwhat); | |
cdc54cc9 TW |
4946 | inside_init |
4947 | = convert_for_assignment (type, | |
4948 | default_conversion (raw_constructor | |
4949 | ? inside_init | |
4950 | : init), | |
9b7267b8 RS |
4951 | &initialization_message, |
4952 | NULL_TREE, NULL_TREE, 0); | |
d45cf215 | 4953 | }); |
400fbf9f | 4954 | |
047de90b | 4955 | if (require_constant && ! TREE_CONSTANT (inside_init)) |
400fbf9f JW |
4956 | { |
4957 | error_init ("initializer element%s is not constant", | |
4958 | " for `%s'", ofwhat); | |
047de90b | 4959 | inside_init = error_mark_node; |
400fbf9f | 4960 | } |
f0c70ef0 RS |
4961 | else if (require_constant |
4962 | && initializer_constant_valid_p (inside_init, TREE_TYPE (inside_init)) == 0) | |
400fbf9f JW |
4963 | { |
4964 | error_init ("initializer element%s is not computable at load time", | |
4965 | " for `%s'", ofwhat); | |
047de90b | 4966 | inside_init = error_mark_node; |
400fbf9f JW |
4967 | } |
4968 | ||
047de90b | 4969 | return inside_init; |
400fbf9f JW |
4970 | } |
4971 | ||
4972 | /* Come here only for records and arrays. */ | |
4973 | ||
4974 | if (TYPE_SIZE (type) && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4975 | { | |
4976 | error_init ("variable-sized object%s may not be initialized", | |
4977 | " `%s'", ofwhat); | |
4978 | return error_mark_node; | |
4979 | } | |
4980 | ||
4981 | if (code == ARRAY_TYPE || code == RECORD_TYPE) | |
4982 | { | |
4983 | if (raw_constructor) | |
047de90b | 4984 | return process_init_constructor (type, inside_init, |
8d9bfdc5 | 4985 | NULL_PTR, constructor_constant, |
400fbf9f JW |
4986 | constructor_constant, ofwhat); |
4987 | else if (tail != 0) | |
4988 | { | |
4989 | *tail = old_tail_contents; | |
8d9bfdc5 RK |
4990 | return process_init_constructor (type, NULL_TREE, tail, |
4991 | constructor_constant, | |
400fbf9f JW |
4992 | constructor_constant, ofwhat); |
4993 | } | |
4994 | else if (flag_traditional) | |
4995 | /* Traditionally one can say `char x[100] = 0;'. */ | |
4996 | return process_init_constructor (type, | |
8d9bfdc5 RK |
4997 | build_nt (CONSTRUCTOR, NULL_TREE, |
4998 | tree_cons (NULL_TREE, | |
4999 | inside_init, | |
5000 | NULL_TREE)), | |
5001 | NULL_PTR, constructor_constant, | |
400fbf9f JW |
5002 | constructor_constant, ofwhat); |
5003 | } | |
5004 | ||
5005 | error_init ("invalid initializer%s", " for `%s'", ofwhat); | |
5006 | return error_mark_node; | |
5007 | } | |
5008 | \f | |
5009 | /* Process a constructor for a variable of type TYPE. | |
5010 | The constructor elements may be specified either with INIT or with ELTS, | |
5011 | only one of which should be non-null. | |
5012 | ||
5013 | If INIT is specified, it is a CONSTRUCTOR node which is specifically | |
5014 | and solely for initializing this datum. | |
5015 | ||
5016 | If ELTS is specified, it is the address of a variable containing | |
5017 | a list of expressions. We take as many elements as we need | |
5018 | from the head of the list and update the list. | |
5019 | ||
5020 | In the resulting constructor, TREE_CONSTANT is set if all elts are | |
5021 | constant, and TREE_STATIC is set if, in addition, all elts are simple enough | |
5022 | constants that the assembler and linker can compute them. | |
5023 | ||
5024 | The argument CONSTANT_VALUE says to print an error if either the | |
5025 | value or any element is not a constant. | |
5026 | ||
5027 | The argument CONSTANT_ELEMENT says to print an error if an element | |
5028 | of an aggregate is not constant. It does not apply to a value | |
5029 | which is not a constructor. | |
5030 | ||
5031 | OFWHAT is a character string describing the object being initialized, | |
5032 | for error messages. It might be "variable" or "variable.member" | |
d45cf215 RS |
5033 | or "variable[17].member[5]". If OFWHAT is null, the description string |
5034 | is stored on the spelling stack. */ | |
400fbf9f JW |
5035 | |
5036 | static tree | |
5037 | process_init_constructor (type, init, elts, constant_value, constant_element, | |
5038 | ofwhat) | |
5039 | tree type, init, *elts; | |
5040 | int constant_value, constant_element; | |
5041 | char *ofwhat; | |
5042 | { | |
5043 | register tree tail; | |
5044 | /* List of the elements of the result constructor, | |
5045 | in reverse order. */ | |
5046 | register tree members = NULL; | |
400fbf9f JW |
5047 | tree result; |
5048 | int allconstant = 1; | |
5049 | int allsimple = 1; | |
5050 | int erroneous = 0; | |
d45cf215 RS |
5051 | int depth = SPELLING_DEPTH (); |
5052 | ||
5053 | if (ofwhat) | |
5054 | push_string (ofwhat); | |
400fbf9f JW |
5055 | |
5056 | /* Make TAIL be the list of elements to use for the initialization, | |
5057 | no matter how the data was given to us. */ | |
5058 | ||
5059 | if (elts) | |
3c3fa147 | 5060 | { |
815a862a | 5061 | if (warn_missing_braces) |
3c3fa147 RS |
5062 | warning ("aggregate has a partly bracketed initializer"); |
5063 | tail = *elts; | |
5064 | } | |
400fbf9f JW |
5065 | else |
5066 | tail = CONSTRUCTOR_ELTS (init); | |
5067 | ||
5068 | /* Gobble as many elements as needed, and make a constructor or initial value | |
5069 | for each element of this aggregate. Chain them together in result. | |
5070 | If there are too few, use 0 for each scalar ultimate component. */ | |
5071 | ||
5072 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5073 | { | |
d45cf215 RS |
5074 | tree min_index, max_index, current_index, members_index; |
5075 | tree bound_type; | |
5076 | tree one; | |
4f77a31b RS |
5077 | /* These are non-zero only within a range initializer. */ |
5078 | tree start_index = 0, end_index = 0; | |
5079 | /* Within a range, this is the value for the elts in the range. */ | |
5080 | tree range_val = 0; | |
d45cf215 RS |
5081 | |
5082 | /* If we have array bounds, set our bounds from that. Otherwise, | |
5083 | we have a lower bound of zero and an unknown upper bound. Also | |
5084 | set the type of the bounds; use "int" as default. */ | |
5085 | if (TYPE_DOMAIN (type)) | |
5086 | { | |
5087 | min_index = members_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type)); | |
5088 | max_index = TYPE_MAX_VALUE (TYPE_DOMAIN (type)); | |
5089 | bound_type = TREE_TYPE (min_index); | |
5090 | } | |
400fbf9f | 5091 | else |
d45cf215 RS |
5092 | { |
5093 | min_index = members_index = integer_zero_node; | |
5094 | max_index = 0; | |
5095 | bound_type = integer_type_node; | |
5096 | } | |
5097 | ||
5098 | one = convert (bound_type, integer_one_node); | |
400fbf9f | 5099 | |
d45cf215 RS |
5100 | /* Don't leave the loop based on index if the next item has an explicit |
5101 | index value that will override it. */ | |
400fbf9f | 5102 | |
4f77a31b | 5103 | for (current_index = min_index; tail != 0 || end_index; |
d45cf215 RS |
5104 | current_index = fold (build (PLUS_EXPR, bound_type, |
5105 | current_index, one))) | |
400fbf9f | 5106 | { |
4f77a31b RS |
5107 | register tree next1 = 0; |
5108 | ||
5109 | /* Handle the case where we are inside of a range. | |
5110 | current_index increments through the range, | |
5111 | so just keep reusing the same element of TAIL | |
5112 | until the end of the range. */ | |
5113 | if (end_index != 0) | |
5114 | { | |
5115 | next1 = range_val; | |
5116 | if (!tree_int_cst_lt (current_index, end_index)) | |
5117 | end_index = 0; | |
5118 | } | |
400fbf9f JW |
5119 | |
5120 | /* If this element specifies an index, | |
5121 | move to that index before storing it in the new list. */ | |
4f77a31b | 5122 | else if (TREE_PURPOSE (tail) != 0) |
400fbf9f JW |
5123 | { |
5124 | int win = 0; | |
5a7ec9d9 | 5125 | tree index = TREE_PURPOSE (tail); |
400fbf9f | 5126 | |
d14774f0 RS |
5127 | if (index && (TREE_CODE (index) == NON_LVALUE_EXPR |
5128 | || TREE_CODE (index) == NOP_EXPR)) | |
5a7ec9d9 RS |
5129 | index = TREE_OPERAND (index, 0); |
5130 | ||
4f77a31b RS |
5131 | /* Begin a range. */ |
5132 | if (TREE_CODE (index) == TREE_LIST) | |
5133 | { | |
5134 | start_index = TREE_PURPOSE (index); | |
5135 | end_index = TREE_PURPOSE (TREE_CHAIN (index)); | |
5136 | ||
d14774f0 RS |
5137 | /* Expose constants. It Doesn't matter if we change |
5138 | the mode.*/ | |
5139 | if (end_index | |
5140 | && (TREE_CODE (end_index) == NON_LVALUE_EXPR | |
5141 | || TREE_CODE (end_index) == NOP_EXPR)) | |
4f77a31b | 5142 | end_index = TREE_OPERAND (end_index, 0); |
d14774f0 RS |
5143 | if (start_index |
5144 | && (TREE_CODE (start_index) == NON_LVALUE_EXPR | |
5145 | || TREE_CODE (start_index) == NOP_EXPR)) | |
4f77a31b RS |
5146 | start_index = TREE_OPERAND (start_index, 0); |
5147 | ||
e58cd767 RS |
5148 | constant_expression_warning (start_index); |
5149 | constant_expression_warning (end_index); | |
5150 | ||
4f77a31b RS |
5151 | if ((TREE_CODE (start_index) == IDENTIFIER_NODE) |
5152 | || (TREE_CODE (end_index) == IDENTIFIER_NODE)) | |
5153 | error ("field name used as index in array initializer"); | |
5154 | else if ((TREE_CODE (start_index) != INTEGER_CST) | |
5155 | || (TREE_CODE (end_index) != INTEGER_CST)) | |
9b7267b8 | 5156 | error ("non-constant or non-integer array index in initializer"); |
4f77a31b RS |
5157 | else if (tree_int_cst_lt (start_index, min_index) |
5158 | || (max_index && tree_int_cst_lt (max_index, start_index)) | |
5159 | || tree_int_cst_lt (end_index, min_index) | |
5160 | || (max_index && tree_int_cst_lt (max_index, end_index))) | |
5161 | error ("array index out of range in initializer"); | |
5162 | else if (tree_int_cst_lt (end_index, start_index)) | |
5163 | { | |
5164 | /* If the range is empty, don't initialize any elements, | |
5165 | but do reset current_index for the next initializer | |
5166 | element. */ | |
5167 | warning ("empty array initializer range"); | |
5168 | tail = TREE_CHAIN (tail); | |
5169 | current_index = end_index; | |
5170 | continue; | |
5171 | } | |
5172 | else | |
5173 | { | |
5174 | current_index = start_index; | |
5175 | win = 1; | |
5176 | /* See if the first element is also the last. */ | |
5177 | if (!tree_int_cst_lt (current_index, end_index)) | |
5178 | end_index = 0; | |
5179 | } | |
5180 | } | |
5181 | else if (TREE_CODE (index) == IDENTIFIER_NODE) | |
400fbf9f | 5182 | error ("field name used as index in array initializer"); |
5a7ec9d9 | 5183 | else if (TREE_CODE (index) != INTEGER_CST) |
400fbf9f | 5184 | error ("non-constant array index in initializer"); |
5a7ec9d9 RS |
5185 | else if (tree_int_cst_lt (index, min_index) |
5186 | || (max_index && tree_int_cst_lt (max_index, index))) | |
400fbf9f JW |
5187 | error ("array index out of range in initializer"); |
5188 | else | |
e58cd767 RS |
5189 | { |
5190 | constant_expression_warning (index); | |
5191 | current_index = index, win = 1; | |
5192 | } | |
400fbf9f JW |
5193 | |
5194 | if (!win) | |
d14774f0 RS |
5195 | { |
5196 | /* If there was an error, end the current range. */ | |
5197 | end_index = 0; | |
5198 | TREE_VALUE (tail) = error_mark_node; | |
5199 | } | |
400fbf9f JW |
5200 | } |
5201 | ||
d45cf215 | 5202 | if (max_index && tree_int_cst_lt (max_index, current_index)) |
400fbf9f JW |
5203 | break; /* Stop if we've indeed run out of elements. */ |
5204 | ||
5205 | /* Now digest the value specified. */ | |
4f77a31b RS |
5206 | if (next1 != 0) |
5207 | ; | |
5208 | else if (TREE_VALUE (tail) != 0) | |
400fbf9f JW |
5209 | { |
5210 | tree tail1 = tail; | |
5211 | ||
d45cf215 RS |
5212 | /* Build the element of this array, with "[]" notation. For |
5213 | error messages, we assume that the index fits within a | |
5214 | host int. */ | |
5215 | SAVE_SPELLING_DEPTH | |
5216 | ({ | |
5217 | push_array_bounds (TREE_INT_CST_LOW (current_index)); | |
5218 | next1 = digest_init (TYPE_MAIN_VARIANT (TREE_TYPE (type)), | |
5219 | TREE_VALUE (tail), &tail1, | |
5220 | /* Both of these are the same because | |
5221 | a value here is an elt overall. */ | |
8d9bfdc5 RK |
5222 | constant_element, constant_element, |
5223 | NULL_PTR); | |
d45cf215 | 5224 | }); |
400fbf9f JW |
5225 | |
5226 | if (tail1 != 0 && TREE_CODE (tail1) != TREE_LIST) | |
5227 | abort (); | |
d45cf215 | 5228 | if (tail == tail1 && TYPE_DOMAIN (type) == 0) |
400fbf9f JW |
5229 | { |
5230 | error_init ( | |
5231 | "non-empty initializer for array%s of empty elements", | |
8d9bfdc5 | 5232 | " `%s'", NULL_PTR); |
400fbf9f JW |
5233 | /* Just ignore what we were supposed to use. */ |
5234 | tail1 = 0; | |
5235 | } | |
5236 | tail = tail1; | |
5237 | } | |
5238 | else | |
5239 | { | |
5240 | next1 = error_mark_node; | |
5241 | tail = TREE_CHAIN (tail); | |
5242 | } | |
5243 | ||
4f77a31b RS |
5244 | if (end_index != 0) |
5245 | range_val = next1; | |
5246 | ||
400fbf9f JW |
5247 | if (next1 == error_mark_node) |
5248 | erroneous = 1; | |
5249 | else if (!TREE_CONSTANT (next1)) | |
5250 | allconstant = 0; | |
f0c70ef0 | 5251 | else if (initializer_constant_valid_p (next1, TREE_TYPE (next1)) == 0) |
400fbf9f JW |
5252 | allsimple = 0; |
5253 | ||
5254 | /* Now store NEXT1 in the list, I elements from the *end*. | |
5255 | Make the list longer if necessary. */ | |
d45cf215 | 5256 | while (! tree_int_cst_lt (current_index, members_index)) |
400fbf9f JW |
5257 | { |
5258 | members = tree_cons (NULL_TREE, NULL_TREE, members); | |
d45cf215 RS |
5259 | members_index = fold (build (PLUS_EXPR, bound_type, |
5260 | members_index, one)); | |
400fbf9f | 5261 | } |
d45cf215 | 5262 | |
400fbf9f JW |
5263 | { |
5264 | tree temp; | |
d45cf215 | 5265 | tree idx; |
400fbf9f JW |
5266 | |
5267 | temp = members; | |
d45cf215 RS |
5268 | for (idx = fold (build (MINUS_EXPR, bound_type, |
5269 | members_index, one)); | |
5270 | tree_int_cst_lt (current_index, idx); | |
5271 | idx = fold (build (MINUS_EXPR, bound_type, idx, one))) | |
400fbf9f JW |
5272 | temp = TREE_CHAIN (temp); |
5273 | TREE_VALUE (temp) = next1; | |
5274 | } | |
5275 | } | |
5276 | } | |
5277 | if (TREE_CODE (type) == RECORD_TYPE) | |
5278 | { | |
5279 | register tree field; | |
d45cf215 | 5280 | int members_length = 0; |
400fbf9f JW |
5281 | int i; |
5282 | ||
5283 | /* Don't leave the loop based on field just yet; see if next item | |
5284 | overrides the expected field first. */ | |
5285 | ||
5286 | for (field = TYPE_FIELDS (type), i = 0; tail; | |
5287 | field = TREE_CHAIN (field), i++) | |
5288 | { | |
5289 | register tree next1; | |
5290 | ||
5291 | /* If this element specifies a field, | |
5292 | move to that field before storing it in the new list. */ | |
5293 | if (TREE_PURPOSE (tail) != 0) | |
5294 | { | |
5295 | int win = 0; | |
5296 | ||
5297 | if (TREE_CODE (TREE_PURPOSE (tail)) != IDENTIFIER_NODE) | |
5298 | error ("index value instead of field name in structure initializer"); | |
5299 | else | |
5300 | { | |
5301 | tree temp; | |
5302 | int j; | |
5303 | for (temp = TYPE_FIELDS (type), j = 0; | |
5304 | temp; | |
5305 | temp = TREE_CHAIN (temp), j++) | |
5306 | if (DECL_NAME (temp) == TREE_PURPOSE (tail)) | |
5307 | break; | |
5308 | if (temp) | |
5309 | field = temp, i = j, win = 1; | |
5310 | else | |
805f961c RS |
5311 | error ("no field `%s' in structure being initialized", |
5312 | IDENTIFIER_POINTER (TREE_PURPOSE (tail))); | |
400fbf9f JW |
5313 | } |
5314 | if (!win) | |
5315 | TREE_VALUE (tail) = error_mark_node; | |
5316 | } | |
5317 | ||
5318 | if (field == 0) | |
5319 | break; /* No more fields to init. */ | |
5320 | ||
5321 | if (! DECL_NAME (field)) | |
5322 | { | |
5323 | next1 = integer_zero_node; | |
5324 | } | |
5325 | else if (TREE_VALUE (tail) != 0) | |
5326 | { | |
5327 | tree tail1 = tail; | |
5328 | ||
5329 | /* Build the name of this member, with a "." for membership. */ | |
d45cf215 RS |
5330 | SAVE_SPELLING_DEPTH |
5331 | ({ | |
5332 | push_member_name (IDENTIFIER_POINTER (DECL_NAME (field))); | |
5333 | next1 = digest_init (TREE_TYPE (field), | |
5334 | TREE_VALUE (tail), &tail1, | |
8d9bfdc5 RK |
5335 | constant_element, constant_element, |
5336 | NULL_PTR); | |
d45cf215 | 5337 | }); |
400fbf9f JW |
5338 | if (tail1 != 0 && TREE_CODE (tail1) != TREE_LIST) |
5339 | abort (); | |
5340 | tail = tail1; | |
5341 | } | |
5342 | else | |
5343 | { | |
5344 | next1 = error_mark_node; | |
5345 | tail = TREE_CHAIN (tail); | |
5346 | } | |
5347 | ||
5348 | if (next1 == error_mark_node) | |
5349 | erroneous = 1; | |
5350 | else if (!TREE_CONSTANT (next1)) | |
5351 | allconstant = 0; | |
f0c70ef0 | 5352 | else if (initializer_constant_valid_p (next1, TREE_TYPE (next1)) == 0) |
400fbf9f JW |
5353 | allsimple = 0; |
5354 | ||
5355 | /* Now store NEXT1 in the list, I elements from the *end*. | |
5356 | Make the list longer if necessary. */ | |
5357 | while (i >= members_length) | |
5358 | { | |
5359 | members = tree_cons (NULL_TREE, NULL_TREE, members); | |
5360 | members_length++; | |
5361 | } | |
5362 | { | |
5363 | tree temp; | |
5364 | int j; | |
5365 | ||
5366 | temp = members; | |
5367 | for (j = members_length - 1; j > i; j--) | |
5368 | temp = TREE_CHAIN (temp); | |
5369 | TREE_VALUE (temp) = next1; | |
5370 | TREE_PURPOSE (temp) = field; | |
5371 | } | |
5372 | } | |
5373 | } | |
5374 | if (TREE_CODE (type) == UNION_TYPE) | |
5375 | { | |
5376 | register tree field = TYPE_FIELDS (type); | |
5377 | register tree next1; | |
5378 | ||
5379 | /* Find the first named field. ANSI decided in September 1990 | |
5380 | that only named fields count here. */ | |
5381 | while (field && DECL_NAME (field) == 0) | |
5382 | field = TREE_CHAIN (field); | |
5383 | ||
5384 | /* For a union, get the initializer for 1 fld. */ | |
5385 | ||
c2f4acb7 RS |
5386 | if (tail == 0) |
5387 | { | |
5388 | error ("empty initializer for union"); | |
5389 | tail = build_tree_list (0, 0); | |
5390 | } | |
5391 | ||
400fbf9f JW |
5392 | /* If this element specifies a field, initialize via that field. */ |
5393 | if (TREE_PURPOSE (tail) != 0) | |
5394 | { | |
5395 | int win = 0; | |
5396 | ||
805f961c RS |
5397 | if (TREE_CODE (TREE_PURPOSE (tail)) == FIELD_DECL) |
5398 | /* Handle the case of a call by build_c_cast. */ | |
5399 | field = TREE_PURPOSE (tail), win = 1; | |
5400 | else if (TREE_CODE (TREE_PURPOSE (tail)) != IDENTIFIER_NODE) | |
400fbf9f JW |
5401 | error ("index value instead of field name in union initializer"); |
5402 | else | |
5403 | { | |
5404 | tree temp; | |
5405 | for (temp = TYPE_FIELDS (type); | |
5406 | temp; | |
5407 | temp = TREE_CHAIN (temp)) | |
5408 | if (DECL_NAME (temp) == TREE_PURPOSE (tail)) | |
5409 | break; | |
5410 | if (temp) | |
5411 | field = temp, win = 1; | |
5412 | else | |
805f961c RS |
5413 | error ("no field `%s' in union being initialized", |
5414 | IDENTIFIER_POINTER (TREE_PURPOSE (tail))); | |
400fbf9f JW |
5415 | } |
5416 | if (!win) | |
5417 | TREE_VALUE (tail) = error_mark_node; | |
5418 | } | |
5419 | ||
5420 | if (TREE_VALUE (tail) != 0) | |
5421 | { | |
5422 | tree tail1 = tail; | |
5423 | ||
5424 | /* Build the name of this member, with a "." for membership. */ | |
d45cf215 RS |
5425 | SAVE_SPELLING_DEPTH |
5426 | ({ | |
5427 | push_member_name (IDENTIFIER_POINTER (DECL_NAME (field))); | |
5428 | next1 = digest_init (TREE_TYPE (field), | |
5429 | TREE_VALUE (tail), &tail1, | |
8d9bfdc5 | 5430 | constant_value, constant_element, NULL_PTR); |
d45cf215 | 5431 | }); |
400fbf9f JW |
5432 | if (tail1 != 0 && TREE_CODE (tail1) != TREE_LIST) |
5433 | abort (); | |
5434 | tail = tail1; | |
5435 | } | |
5436 | else | |
5437 | { | |
5438 | next1 = error_mark_node; | |
5439 | tail = TREE_CHAIN (tail); | |
5440 | } | |
5441 | ||
5442 | if (next1 == error_mark_node) | |
5443 | erroneous = 1; | |
5444 | else if (!TREE_CONSTANT (next1)) | |
5445 | allconstant = 0; | |
f0c70ef0 | 5446 | else if (initializer_constant_valid_p (next1, TREE_TYPE (next1)) == 0) |
400fbf9f JW |
5447 | allsimple = 0; |
5448 | members = tree_cons (field, next1, members); | |
5449 | } | |
5450 | ||
5451 | /* If arguments were specified as a list, just remove the ones we used. */ | |
5452 | if (elts) | |
5453 | *elts = tail; | |
5454 | /* If arguments were specified as a constructor, | |
5455 | complain unless we used all the elements of the constructor. */ | |
5456 | else if (tail) | |
5457 | { | |
5458 | if (TREE_CODE (type) == UNION_TYPE) | |
5459 | { | |
5460 | pedwarn_init ("excess elements in union initializer%s", | |
8d9bfdc5 | 5461 | " after `%s'", NULL_PTR); |
400fbf9f JW |
5462 | } |
5463 | else | |
5464 | { | |
5465 | pedwarn_init ("excess elements in aggregate initializer%s", | |
8d9bfdc5 | 5466 | " after `%s'", NULL_PTR); |
400fbf9f JW |
5467 | } |
5468 | } | |
5469 | ||
d45cf215 RS |
5470 | /* It might be possible to use SAVE_SPELLING_DEPTH, but I suspect that |
5471 | some preprocessor somewhere won't accept that much text as an argument. | |
5472 | It's also likely to make debugging difficult. */ | |
5473 | ||
5474 | RESTORE_SPELLING_DEPTH (depth); | |
5475 | ||
400fbf9f JW |
5476 | if (erroneous) |
5477 | return error_mark_node; | |
5478 | ||
5479 | result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (members)); | |
5480 | if (allconstant) TREE_CONSTANT (result) = 1; | |
5481 | if (allconstant && allsimple) TREE_STATIC (result) = 1; | |
5482 | return result; | |
5483 | } | |
5484 | \f | |
5485 | /* Expand an ASM statement with operands, handling output operands | |
5486 | that are not variables or INDIRECT_REFS by transforming such | |
5487 | cases into cases that expand_asm_operands can handle. | |
5488 | ||
5489 | Arguments are same as for expand_asm_operands. */ | |
5490 | ||
5491 | void | |
5492 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
5493 | tree string, outputs, inputs, clobbers; | |
5494 | int vol; | |
5495 | char *filename; | |
5496 | int line; | |
5497 | { | |
5498 | int noutputs = list_length (outputs); | |
5499 | register int i; | |
5500 | /* o[I] is the place that output number I should be written. */ | |
5501 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
5502 | register tree tail; | |
5503 | ||
5504 | if (TREE_CODE (string) == ADDR_EXPR) | |
5505 | string = TREE_OPERAND (string, 0); | |
5506 | if (TREE_CODE (string) != STRING_CST) | |
5507 | { | |
5508 | error ("asm template is not a string constant"); | |
5509 | return; | |
5510 | } | |
5511 | ||
7b6327ae | 5512 | /* Record the contents of OUTPUTS before it is modified. */ |
400fbf9f JW |
5513 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) |
5514 | o[i] = TREE_VALUE (tail); | |
5515 | ||
5516 | /* Perform default conversions on array and function inputs. */ | |
5517 | /* Don't do this for other types-- | |
5518 | it would screw up operands expected to be in memory. */ | |
5519 | for (i = 0, tail = inputs; tail; tail = TREE_CHAIN (tail), i++) | |
5520 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == ARRAY_TYPE | |
5521 | || TREE_CODE (TREE_TYPE (TREE_VALUE (tail))) == FUNCTION_TYPE) | |
5522 | TREE_VALUE (tail) = default_conversion (TREE_VALUE (tail)); | |
5523 | ||
5524 | /* Generate the ASM_OPERANDS insn; | |
5525 | store into the TREE_VALUEs of OUTPUTS some trees for | |
5526 | where the values were actually stored. */ | |
5527 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
5528 | ||
5529 | /* Copy all the intermediate outputs into the specified outputs. */ | |
5530 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
5531 | { | |
5532 | if (o[i] != TREE_VALUE (tail)) | |
5533 | { | |
5534 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
5535 | 0, VOIDmode, 0); | |
5536 | free_temp_slots (); | |
5537 | } | |
5538 | /* Detect modification of read-only values. | |
5539 | (Otherwise done by build_modify_expr.) */ | |
5540 | else | |
5541 | { | |
5542 | tree type = TREE_TYPE (o[i]); | |
5543 | if (TYPE_READONLY (type) | |
5544 | || ((TREE_CODE (type) == RECORD_TYPE | |
5545 | || TREE_CODE (type) == UNION_TYPE) | |
5546 | && C_TYPE_FIELDS_READONLY (type))) | |
5547 | readonly_warning (o[i], "modification by `asm'"); | |
5548 | } | |
5549 | } | |
5550 | ||
5551 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
5552 | emit_queue (); | |
5553 | } | |
5554 | \f | |
5555 | /* Expand a C `return' statement. | |
5556 | RETVAL is the expression for what to return, | |
5557 | or a null pointer for `return;' with no value. */ | |
5558 | ||
5559 | void | |
5560 | c_expand_return (retval) | |
5561 | tree retval; | |
5562 | { | |
5563 | tree valtype = TREE_TYPE (TREE_TYPE (current_function_decl)); | |
5564 | ||
5565 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
5566 | warning ("function declared `volatile' has a `return' statement"); | |
5567 | ||
5568 | if (!retval) | |
5569 | { | |
5570 | current_function_returns_null = 1; | |
5571 | if (warn_return_type && valtype != 0 && TREE_CODE (valtype) != VOID_TYPE) | |
5572 | warning ("`return' with no value, in function returning non-void"); | |
5573 | expand_null_return (); | |
5574 | } | |
5575 | else if (valtype == 0 || TREE_CODE (valtype) == VOID_TYPE) | |
5576 | { | |
5577 | current_function_returns_null = 1; | |
5578 | if (pedantic || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
5579 | pedwarn ("`return' with a value, in function returning void"); | |
5580 | expand_return (retval); | |
5581 | } | |
5582 | else | |
5583 | { | |
5584 | tree t = convert_for_assignment (valtype, retval, "return", | |
9b7267b8 | 5585 | NULL_TREE, NULL_TREE, 0); |
400fbf9f JW |
5586 | tree res = DECL_RESULT (current_function_decl); |
5587 | t = build (MODIFY_EXPR, TREE_TYPE (res), | |
5588 | res, convert (TREE_TYPE (res), t)); | |
5589 | expand_return (t); | |
5590 | current_function_returns_value = 1; | |
5591 | } | |
5592 | } | |
5593 | \f | |
5594 | /* Start a C switch statement, testing expression EXP. | |
5595 | Return EXP if it is valid, an error node otherwise. */ | |
5596 | ||
5597 | tree | |
5598 | c_expand_start_case (exp) | |
5599 | tree exp; | |
5600 | { | |
5601 | register enum tree_code code = TREE_CODE (TREE_TYPE (exp)); | |
5602 | tree type = TREE_TYPE (exp); | |
5603 | ||
5604 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
5605 | { | |
5606 | error ("switch quantity not an integer"); | |
5607 | exp = error_mark_node; | |
5608 | } | |
5609 | else | |
5610 | { | |
5611 | tree index; | |
6cb72a7d | 5612 | type = TYPE_MAIN_VARIANT (TREE_TYPE (exp)); |
400fbf9f JW |
5613 | |
5614 | if (warn_traditional | |
6cb72a7d RS |
5615 | && (type == long_integer_type_node |
5616 | || type == long_unsigned_type_node)) | |
400fbf9f JW |
5617 | pedwarn ("`long' switch expression not converted to `int' in ANSI C"); |
5618 | ||
5619 | exp = default_conversion (exp); | |
5620 | type = TREE_TYPE (exp); | |
8d9bfdc5 | 5621 | index = get_unwidened (exp, NULL_TREE); |
400fbf9f JW |
5622 | /* We can't strip a conversion from a signed type to an unsigned, |
5623 | because if we did, int_fits_type_p would do the wrong thing | |
5624 | when checking case values for being in range, | |
5625 | and it's too hard to do the right thing. */ | |
5626 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
5627 | == TREE_UNSIGNED (TREE_TYPE (index))) | |
5628 | exp = index; | |
5629 | } | |
5630 | ||
5631 | expand_start_case (1, exp, type, "switch statement"); | |
5632 | ||
5633 | return exp; | |
5634 | } |