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8d08fdba | 1 | /* Build expressions with type checking for C++ compiler. |
357a4089 | 2 | Copyright (C) 1987, 88, 89, 92, 93, 94, 95, 1996 Free Software Foundation, Inc. |
8d08fdba MS |
3 | Hacked by Michael Tiemann (tiemann@cygnus.com) |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
6bc06b8f RK |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
21 | |
22 | ||
23 | /* This file is part of the C++ front end. | |
24 | It contains routines to build C++ expressions given their operands, | |
25 | including computing the types of the result, C and C++ specific error | |
26 | checks, and some optimization. | |
27 | ||
28 | There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, | |
29 | and to process initializations in declarations (since they work | |
30 | like a strange sort of assignment). */ | |
31 | ||
32 | extern void error (); | |
33 | extern void warning (); | |
34 | ||
35 | #include "config.h" | |
36 | #include <stdio.h> | |
37 | #include "tree.h" | |
38 | #include "rtl.h" | |
39 | #include "cp-tree.h" | |
40 | #include "flags.h" | |
e8abc66f | 41 | #include "output.h" |
8d08fdba | 42 | |
cdf5b885 MS |
43 | int mark_addressable PROTO((tree)); |
44 | static tree convert_for_assignment PROTO((tree, tree, char*, tree, int)); | |
45 | /* static */ tree convert_for_initialization PROTO((tree, tree, tree, int, char*, tree, int)); | |
8d08fdba MS |
46 | extern tree shorten_compare (); |
47 | extern void binary_op_error (); | |
cdf5b885 MS |
48 | static tree pointer_int_sum PROTO((enum tree_code, register tree, register tree)); |
49 | static tree pointer_diff PROTO((register tree, register tree)); | |
50 | #if 0 | |
8d08fdba | 51 | static tree convert_sequence (); |
cdf5b885 MS |
52 | #endif |
53 | /* static */ tree unary_complex_lvalue PROTO((enum tree_code, tree)); | |
8145f082 | 54 | static tree get_delta_difference PROTO((tree, tree, int)); |
8d08fdba MS |
55 | |
56 | extern rtx original_result_rtx; | |
a5894242 | 57 | extern int warn_synth; |
8d08fdba MS |
58 | |
59 | /* Return the target type of TYPE, which meas return T for: | |
60 | T*, T&, T[], T (...), and otherwise, just T. */ | |
61 | ||
62 | tree | |
63 | target_type (type) | |
64 | tree type; | |
65 | { | |
66 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
67 | type = TREE_TYPE (type); | |
68 | while (TREE_CODE (type) == POINTER_TYPE | |
69 | || TREE_CODE (type) == ARRAY_TYPE | |
70 | || TREE_CODE (type) == FUNCTION_TYPE | |
71 | || TREE_CODE (type) == METHOD_TYPE | |
72 | || TREE_CODE (type) == OFFSET_TYPE) | |
73 | type = TREE_TYPE (type); | |
74 | return type; | |
75 | } | |
76 | ||
77 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
78 | does not have an incomplete type. (That includes void types.) */ | |
79 | ||
80 | tree | |
81 | require_complete_type (value) | |
82 | tree value; | |
83 | { | |
5566b478 MS |
84 | tree type; |
85 | ||
86 | if (current_template_parms) | |
87 | return value; | |
88 | ||
89 | type = TREE_TYPE (value); | |
8d08fdba MS |
90 | |
91 | /* First, detect a valid value with a complete type. */ | |
92 | if (TYPE_SIZE (type) != 0 | |
93 | && type != void_type_node | |
94 | && ! (TYPE_LANG_SPECIFIC (type) | |
95 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)) | |
96 | && TYPE_SIZE (SIGNATURE_TYPE (type)) == 0)) | |
97 | return value; | |
98 | ||
99 | /* If we see X::Y, we build an OFFSET_TYPE which has | |
100 | not been laid out. Try to avoid an error by interpreting | |
101 | it as this->X::Y, if reasonable. */ | |
102 | if (TREE_CODE (value) == OFFSET_REF | |
4ac14744 MS |
103 | && current_class_ref != 0 |
104 | && TREE_OPERAND (value, 0) == current_class_ref) | |
8d08fdba MS |
105 | { |
106 | tree base, member = TREE_OPERAND (value, 1); | |
107 | tree basetype = TYPE_OFFSET_BASETYPE (type); | |
108 | my_friendly_assert (TREE_CODE (member) == FIELD_DECL, 305); | |
4ac14744 | 109 | base = convert_pointer_to (basetype, current_class_ptr); |
8d08fdba MS |
110 | value = build (COMPONENT_REF, TREE_TYPE (member), |
111 | build_indirect_ref (base, NULL_PTR), member); | |
112 | return require_complete_type (value); | |
113 | } | |
114 | ||
5566b478 MS |
115 | if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) |
116 | { | |
909e536a | 117 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
118 | if (TYPE_SIZE (type) != 0) |
119 | return value; | |
120 | } | |
121 | ||
8d08fdba MS |
122 | incomplete_type_error (value, type); |
123 | return error_mark_node; | |
124 | } | |
125 | ||
5566b478 MS |
126 | tree |
127 | complete_type (type) | |
128 | tree type; | |
129 | { | |
130 | if (TYPE_SIZE (type) != NULL_TREE) | |
131 | ; | |
132 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
133 | { | |
134 | tree t = complete_type (TREE_TYPE (type)); | |
135 | if (TYPE_SIZE (t) != NULL_TREE) | |
136 | type = build_cplus_array_type (t, TYPE_DOMAIN (type)); | |
137 | } | |
138 | else if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
e76a2646 | 139 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
140 | |
141 | return type; | |
142 | } | |
143 | ||
8d08fdba MS |
144 | /* Return truthvalue of whether type of EXP is instantiated. */ |
145 | int | |
146 | type_unknown_p (exp) | |
147 | tree exp; | |
148 | { | |
149 | return (TREE_CODE (exp) == TREE_LIST | |
150 | || TREE_TYPE (exp) == unknown_type_node | |
151 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
152 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)); | |
153 | } | |
154 | ||
155 | /* Return truthvalue of whether T is function (or pfn) type. */ | |
156 | int | |
157 | fntype_p (t) | |
158 | tree t; | |
159 | { | |
160 | return (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE | |
161 | || (TREE_CODE (t) == POINTER_TYPE | |
162 | && (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE | |
163 | || TREE_CODE (TREE_TYPE (t)) == METHOD_TYPE))); | |
164 | } | |
165 | ||
166 | /* Do `exp = require_instantiated_type (type, exp);' to make sure EXP | |
167 | does not have an uninstantiated type. | |
168 | TYPE is type to instantiate with, if uninstantiated. */ | |
169 | tree | |
170 | require_instantiated_type (type, exp, errval) | |
171 | tree type, exp, errval; | |
172 | { | |
173 | if (TREE_TYPE (exp) == NULL_TREE) | |
174 | { | |
175 | error ("argument list may not have an initializer list"); | |
176 | return errval; | |
177 | } | |
178 | ||
179 | if (TREE_TYPE (exp) == unknown_type_node | |
180 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
181 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)) | |
182 | { | |
183 | exp = instantiate_type (type, exp, 1); | |
184 | if (TREE_TYPE (exp) == error_mark_node) | |
185 | return errval; | |
186 | } | |
187 | return exp; | |
188 | } | |
189 | ||
190 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
191 | as well as those of TYPE. */ | |
192 | ||
193 | static tree | |
194 | qualify_type (type, like) | |
195 | tree type, like; | |
196 | { | |
197 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
198 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
199 | /* @@ Must do member pointers here. */ | |
f376e137 | 200 | return cp_build_type_variant (type, constflag, volflag); |
8d08fdba MS |
201 | } |
202 | \f | |
203 | /* Return the common type of two parameter lists. | |
204 | We assume that comptypes has already been done and returned 1; | |
205 | if that isn't so, this may crash. | |
206 | ||
207 | As an optimization, free the space we allocate if the parameter | |
208 | lists are already common. */ | |
209 | ||
210 | tree | |
211 | commonparms (p1, p2) | |
212 | tree p1, p2; | |
213 | { | |
214 | tree oldargs = p1, newargs, n; | |
215 | int i, len; | |
216 | int any_change = 0; | |
217 | char *first_obj = (char *) oballoc (0); | |
218 | ||
219 | len = list_length (p1); | |
220 | newargs = tree_last (p1); | |
221 | ||
222 | if (newargs == void_list_node) | |
223 | i = 1; | |
224 | else | |
225 | { | |
226 | i = 0; | |
227 | newargs = 0; | |
228 | } | |
229 | ||
230 | for (; i < len; i++) | |
231 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); | |
232 | ||
233 | n = newargs; | |
234 | ||
235 | for (i = 0; p1; | |
236 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) | |
237 | { | |
238 | if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) | |
239 | { | |
8d08fdba MS |
240 | TREE_PURPOSE (n) = TREE_PURPOSE (p1); |
241 | any_change = 1; | |
242 | } | |
243 | else if (! TREE_PURPOSE (p1)) | |
244 | { | |
245 | if (TREE_PURPOSE (p2)) | |
246 | { | |
247 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); | |
248 | any_change = 1; | |
249 | } | |
250 | } | |
251 | else | |
252 | { | |
1743ca29 | 253 | if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2))) |
a4443a08 | 254 | any_change = 1; |
8d08fdba MS |
255 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); |
256 | } | |
257 | if (TREE_VALUE (p1) != TREE_VALUE (p2)) | |
258 | { | |
259 | any_change = 1; | |
260 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
261 | } | |
262 | else | |
263 | TREE_VALUE (n) = TREE_VALUE (p1); | |
264 | } | |
265 | if (! any_change) | |
266 | { | |
267 | obfree (first_obj); | |
268 | return oldargs; | |
269 | } | |
270 | ||
271 | return newargs; | |
272 | } | |
273 | ||
274 | /* Return the common type of two types. | |
275 | We assume that comptypes has already been done and returned 1; | |
276 | if that isn't so, this may crash. | |
277 | ||
278 | This is the type for the result of most arithmetic operations | |
279 | if the operands have the given two types. | |
280 | ||
281 | We do not deal with enumeral types here because they have already been | |
282 | converted to integer types. */ | |
283 | ||
284 | tree | |
285 | common_type (t1, t2) | |
286 | tree t1, t2; | |
287 | { | |
288 | register enum tree_code code1; | |
289 | register enum tree_code code2; | |
2986ae00 | 290 | tree attributes; |
8d08fdba MS |
291 | |
292 | /* Save time if the two types are the same. */ | |
293 | ||
294 | if (t1 == t2) return t1; | |
295 | ||
296 | /* If one type is nonsense, use the other. */ | |
297 | if (t1 == error_mark_node) | |
298 | return t2; | |
299 | if (t2 == error_mark_node) | |
300 | return t1; | |
301 | ||
2986ae00 MS |
302 | /* Merge the attributes */ |
303 | ||
304 | { register tree a1, a2; | |
305 | a1 = TYPE_ATTRIBUTES (t1); | |
306 | a2 = TYPE_ATTRIBUTES (t2); | |
307 | ||
308 | /* Either one unset? Take the set one. */ | |
309 | ||
310 | if (!(attributes = a1)) | |
311 | attributes = a2; | |
312 | ||
313 | /* One that completely contains the other? Take it. */ | |
314 | ||
315 | else if (a2 && !attribute_list_contained (a1, a2)) | |
316 | if (attribute_list_contained (a2, a1)) | |
317 | attributes = a2; | |
318 | else | |
319 | { | |
2db70b29 DE |
320 | /* Pick the longest list, and hang on the other list. */ |
321 | /* ??? For the moment we punt on the issue of attrs with args. */ | |
2986ae00 MS |
322 | |
323 | if (list_length (a1) < list_length (a2)) | |
324 | attributes = a2, a2 = a1; | |
325 | ||
326 | for (; a2; a2 = TREE_CHAIN (a2)) | |
2db70b29 DE |
327 | if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)), |
328 | attributes) == NULL_TREE) | |
2986ae00 MS |
329 | { |
330 | a1 = copy_node (a2); | |
331 | TREE_CHAIN (a1) = attributes; | |
332 | attributes = a1; | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
8d08fdba MS |
337 | /* Treat an enum type as the unsigned integer type of the same width. */ |
338 | ||
339 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
340 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
341 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
342 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
343 | ||
5566b478 MS |
344 | if (TYPE_PTRMEMFUNC_P (t1)) |
345 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
346 | if (TYPE_PTRMEMFUNC_P (t2)) | |
347 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
348 | ||
8d08fdba MS |
349 | code1 = TREE_CODE (t1); |
350 | code2 = TREE_CODE (t2); | |
351 | ||
352 | switch (code1) | |
353 | { | |
354 | case INTEGER_TYPE: | |
355 | case REAL_TYPE: | |
356 | /* If only one is real, use it as the result. */ | |
357 | ||
358 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
2986ae00 | 359 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
360 | |
361 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
2986ae00 | 362 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
363 | |
364 | /* Both real or both integers; use the one with greater precision. */ | |
365 | ||
366 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
2986ae00 | 367 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 368 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
2986ae00 | 369 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
370 | |
371 | /* Same precision. Prefer longs to ints even when same size. */ | |
2986ae00 | 372 | |
8d08fdba MS |
373 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
374 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
2986ae00 MS |
375 | return build_type_attribute_variant (long_unsigned_type_node, |
376 | attributes); | |
8d08fdba MS |
377 | |
378 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node | |
379 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
380 | { | |
381 | /* But preserve unsignedness from the other type, | |
382 | since long cannot hold all the values of an unsigned int. */ | |
383 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
2986ae00 MS |
384 | t1 = long_unsigned_type_node; |
385 | else | |
386 | t1 = long_integer_type_node; | |
387 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
388 | } |
389 | ||
e1cd6e56 MS |
390 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node |
391 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
392 | return build_type_attribute_variant (long_double_type_node, | |
393 | attributes); | |
394 | ||
8d08fdba MS |
395 | /* Otherwise prefer the unsigned one. */ |
396 | ||
397 | if (TREE_UNSIGNED (t1)) | |
2986ae00 MS |
398 | return build_type_attribute_variant (t1, attributes); |
399 | else | |
400 | return build_type_attribute_variant (t2, attributes); | |
8d08fdba MS |
401 | |
402 | case POINTER_TYPE: | |
403 | case REFERENCE_TYPE: | |
404 | /* For two pointers, do this recursively on the target type, | |
405 | and combine the qualifiers of the two types' targets. */ | |
406 | /* This code was turned off; I don't know why. | |
407 | But ANSI C++ specifies doing this with the qualifiers. | |
408 | So I turned it on again. */ | |
409 | { | |
28cbf42c MS |
410 | tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (t1)); |
411 | tree tt2 = TYPE_MAIN_VARIANT (TREE_TYPE (t2)); | |
8d08fdba MS |
412 | int constp |
413 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
414 | int volatilep | |
415 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
28cbf42c MS |
416 | tree target; |
417 | ||
418 | if (tt1 == tt2) | |
419 | target = tt1; | |
7215f9a0 | 420 | else if (tt1 == void_type_node || tt2 == void_type_node) |
28cbf42c | 421 | target = void_type_node; |
7215f9a0 MS |
422 | else |
423 | target = common_type (tt1, tt2); | |
28cbf42c | 424 | |
f376e137 | 425 | target = cp_build_type_variant (target, constp, volatilep); |
8d08fdba | 426 | if (code1 == POINTER_TYPE) |
2986ae00 | 427 | t1 = build_pointer_type (target); |
8d08fdba | 428 | else |
2986ae00 | 429 | t1 = build_reference_type (target); |
71851aaa MS |
430 | t1 = build_type_attribute_variant (t1, attributes); |
431 | ||
432 | if (TREE_CODE (target) == METHOD_TYPE) | |
433 | t1 = build_ptrmemfunc_type (t1); | |
434 | ||
435 | return t1; | |
8d08fdba | 436 | } |
8d08fdba MS |
437 | |
438 | case ARRAY_TYPE: | |
439 | { | |
67d743fe MS |
440 | int constp |
441 | = TYPE_READONLY (t1) || TYPE_READONLY (t2); | |
442 | int volatilep | |
443 | = TYPE_VOLATILE (t1) || TYPE_VOLATILE (t2); | |
8d08fdba MS |
444 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); |
445 | /* Save space: see if the result is identical to one of the args. */ | |
446 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
2986ae00 | 447 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 448 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
2986ae00 | 449 | return build_type_attribute_variant (t2, attributes); |
8d08fdba | 450 | /* Merge the element types, and have a size if either arg has one. */ |
67d743fe MS |
451 | t1 = build_cplus_array_type (TYPE_MAIN_VARIANT (elt), TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); |
452 | if (constp || volatilep) | |
453 | t1 = cp_build_type_variant (t1, constp, volatilep); | |
2986ae00 | 454 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
455 | } |
456 | ||
457 | case FUNCTION_TYPE: | |
458 | /* Function types: prefer the one that specified arg types. | |
459 | If both do, merge the arg types. Also merge the return types. */ | |
460 | { | |
461 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
462 | tree p1 = TYPE_ARG_TYPES (t1); | |
463 | tree p2 = TYPE_ARG_TYPES (t2); | |
464 | tree rval, raises; | |
465 | ||
466 | /* Save space: see if the result is identical to one of the args. */ | |
467 | if (valtype == TREE_TYPE (t1) && ! p2) | |
2986ae00 | 468 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 469 | if (valtype == TREE_TYPE (t2) && ! p1) |
2986ae00 | 470 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
471 | |
472 | /* Simple way if one arg fails to specify argument types. */ | |
473 | if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) | |
474 | { | |
475 | rval = build_function_type (valtype, p2); | |
8926095f | 476 | if ((raises = TYPE_RAISES_EXCEPTIONS (t2))) |
f30432d7 | 477 | rval = build_exception_variant (rval, raises); |
2986ae00 | 478 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
479 | } |
480 | raises = TYPE_RAISES_EXCEPTIONS (t1); | |
481 | if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) | |
482 | { | |
483 | rval = build_function_type (valtype, p1); | |
484 | if (raises) | |
f30432d7 | 485 | rval = build_exception_variant (rval, raises); |
2986ae00 | 486 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
487 | } |
488 | ||
489 | rval = build_function_type (valtype, commonparms (p1, p2)); | |
f30432d7 | 490 | rval = build_exception_variant (rval, raises); |
2986ae00 | 491 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
492 | } |
493 | ||
494 | case RECORD_TYPE: | |
495 | case UNION_TYPE: | |
496 | my_friendly_assert (TYPE_MAIN_VARIANT (t1) == t1 | |
497 | && TYPE_MAIN_VARIANT (t2) == t2, 306); | |
498 | ||
e1cd6e56 MS |
499 | if (DERIVED_FROM_P (t1, t2) && binfo_or_else (t1, t2)) |
500 | return build_type_attribute_variant (t1, attributes); | |
501 | else if (binfo_or_else (t2, t1)) | |
502 | return build_type_attribute_variant (t2, attributes); | |
503 | else | |
504 | compiler_error ("common_type called with uncommon aggregate types"); | |
8d08fdba MS |
505 | |
506 | case METHOD_TYPE: | |
71851aaa | 507 | if (TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) |
8d08fdba MS |
508 | { |
509 | /* Get this value the long way, since TYPE_METHOD_BASETYPE | |
510 | is just the main variant of this. */ | |
71851aaa | 511 | tree basetype; |
8d08fdba MS |
512 | tree raises, t3; |
513 | ||
71851aaa MS |
514 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
515 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
516 | ||
5566b478 MS |
517 | if (comptypes (b1, b2, 1) |
518 | || (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2))) | |
71851aaa MS |
519 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2))); |
520 | else | |
521 | { | |
522 | if (binfo_or_else (b2, b1) == NULL_TREE) | |
523 | compiler_error ("common_type called with uncommon method types"); | |
524 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1))); | |
525 | } | |
526 | ||
8d08fdba MS |
527 | raises = TYPE_RAISES_EXCEPTIONS (t1); |
528 | ||
529 | /* If this was a member function type, get back to the | |
530 | original type of type member function (i.e., without | |
531 | the class instance variable up front. */ | |
532 | t1 = build_function_type (TREE_TYPE (t1), TREE_CHAIN (TYPE_ARG_TYPES (t1))); | |
533 | t2 = build_function_type (TREE_TYPE (t2), TREE_CHAIN (TYPE_ARG_TYPES (t2))); | |
534 | t3 = common_type (t1, t2); | |
535 | t3 = build_cplus_method_type (basetype, TREE_TYPE (t3), TYPE_ARG_TYPES (t3)); | |
f30432d7 | 536 | t1 = build_exception_variant (t3, raises); |
8d08fdba | 537 | } |
2986ae00 MS |
538 | else |
539 | compiler_error ("common_type called with uncommon method types"); | |
540 | ||
541 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
542 | |
543 | case OFFSET_TYPE: | |
71851aaa | 544 | if (TREE_TYPE (t1) == TREE_TYPE (t2)) |
8d08fdba | 545 | { |
28cbf42c MS |
546 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
547 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
2986ae00 | 548 | |
28cbf42c | 549 | if (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2)) |
28cbf42c | 550 | return build_type_attribute_variant (t2, attributes); |
71851aaa MS |
551 | else if (binfo_or_else (b2, b1)) |
552 | return build_type_attribute_variant (t1, attributes); | |
28cbf42c MS |
553 | } |
554 | compiler_error ("common_type called with uncommon member types"); | |
8d08fdba MS |
555 | |
556 | default: | |
2986ae00 | 557 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
558 | } |
559 | } | |
560 | \f | |
561 | /* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */ | |
562 | int | |
5566b478 | 563 | compexcepttypes (t1, t2) |
8d08fdba | 564 | tree t1, t2; |
8d08fdba MS |
565 | { |
566 | return TYPE_RAISES_EXCEPTIONS (t1) == TYPE_RAISES_EXCEPTIONS (t2); | |
567 | } | |
568 | ||
569 | static int | |
570 | comp_array_types (cmp, t1, t2, strict) | |
571 | register int (*cmp)(); | |
572 | tree t1, t2; | |
573 | int strict; | |
574 | { | |
575 | tree d1 = TYPE_DOMAIN (t1); | |
576 | tree d2 = TYPE_DOMAIN (t2); | |
577 | ||
578 | /* Target types must match incl. qualifiers. */ | |
579 | if (!(TREE_TYPE (t1) == TREE_TYPE (t2) | |
580 | || (*cmp) (TREE_TYPE (t1), TREE_TYPE (t2), strict))) | |
581 | return 0; | |
582 | ||
583 | /* Sizes must match unless one is missing or variable. */ | |
584 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
585 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
586 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
587 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
588 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
589 | return 1; | |
590 | ||
591 | return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) | |
592 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) | |
593 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
594 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
595 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
596 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
597 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
598 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))); | |
599 | } | |
600 | ||
601 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
602 | or various other operations. This is what ANSI C++ speaks of as | |
603 | "being the same". | |
604 | ||
605 | For C++: argument STRICT says we should be strict about this | |
606 | comparison: | |
607 | ||
608 | 2 : strict, except that if one type is a reference and | |
609 | the other is not, compare the target type of the | |
610 | reference to the type that's not a reference (ARM, p308). | |
59be0cdd | 611 | This is used for checking for invalid overloading. |
8d08fdba | 612 | 1 : strict (compared according to ANSI C) |
a0a33927 | 613 | This is used for checking whether two function decls match. |
8d08fdba MS |
614 | 0 : <= (compared according to C++) |
615 | -1: <= or >= (relaxed) | |
616 | ||
617 | Otherwise, pointers involving base classes and derived classes | |
59be0cdd | 618 | can be mixed as valid: i.e. a pointer to a base class may be assigned |
8d08fdba MS |
619 | to a pointer to one of its derived classes, as per C++. A pointer to |
620 | a derived class may be passed as a parameter to a function expecting a | |
621 | pointer to a base classes. These allowances do not commute. In this | |
622 | case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to | |
623 | be the derived class. */ | |
624 | int | |
625 | comptypes (type1, type2, strict) | |
626 | tree type1, type2; | |
627 | int strict; | |
628 | { | |
629 | register tree t1 = type1; | |
630 | register tree t2 = type2; | |
2986ae00 | 631 | int attrval, val; |
8d08fdba MS |
632 | |
633 | /* Suppress errors caused by previously reported errors */ | |
634 | ||
635 | if (t1 == t2) | |
636 | return 1; | |
637 | ||
638 | /* This should never happen. */ | |
639 | my_friendly_assert (t1 != error_mark_node, 307); | |
640 | ||
641 | if (t2 == error_mark_node) | |
642 | return 0; | |
643 | ||
644 | if (strict < 0) | |
645 | { | |
646 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
647 | ||
648 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
649 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
650 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
651 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
8d08fdba | 652 | |
51c184be MS |
653 | if (t1 == t2) |
654 | return 1; | |
655 | } | |
8d08fdba | 656 | |
5566b478 MS |
657 | if (TYPE_PTRMEMFUNC_P (t1)) |
658 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
659 | if (TYPE_PTRMEMFUNC_P (t2)) | |
660 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
661 | ||
8d08fdba MS |
662 | /* Different classes of types can't be compatible. */ |
663 | ||
664 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
665 | { | |
666 | if (strict == 2 | |
667 | && ((TREE_CODE (t1) == REFERENCE_TYPE) | |
668 | ^ (TREE_CODE (t2) == REFERENCE_TYPE))) | |
669 | { | |
670 | if (TREE_CODE (t1) == REFERENCE_TYPE) | |
671 | return comptypes (TREE_TYPE (t1), t2, 1); | |
672 | return comptypes (t1, TREE_TYPE (t2), 1); | |
673 | } | |
674 | ||
675 | return 0; | |
676 | } | |
677 | if (strict > 1) | |
678 | strict = 1; | |
679 | ||
680 | /* Qualifiers must match. */ | |
681 | ||
682 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
683 | return 0; | |
a0a33927 | 684 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) |
8d08fdba MS |
685 | return 0; |
686 | ||
687 | /* Allow for two different type nodes which have essentially the same | |
688 | definition. Note that we already checked for equality of the type | |
689 | type qualifiers (just above). */ | |
690 | ||
691 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
692 | return 1; | |
693 | ||
cffa8729 MS |
694 | /* ??? COMP_TYPE_ATTRIBUTES is currently useless for variables as each |
695 | attribute is its own main variant (`val' will remain 0). */ | |
696 | #ifndef COMP_TYPE_ATTRIBUTES | |
697 | #define COMP_TYPE_ATTRIBUTES(t1,t2) 1 | |
698 | #endif | |
699 | ||
700 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
2986ae00 MS |
701 | if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) |
702 | return 0; | |
2986ae00 MS |
703 | |
704 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
705 | val = 0; | |
706 | ||
8d08fdba MS |
707 | switch (TREE_CODE (t1)) |
708 | { | |
709 | case RECORD_TYPE: | |
710 | case UNION_TYPE: | |
5566b478 MS |
711 | if (CLASSTYPE_TEMPLATE_INFO (t1) && CLASSTYPE_TEMPLATE_INFO (t2) |
712 | && CLASSTYPE_TI_TEMPLATE (t1) == CLASSTYPE_TI_TEMPLATE (t2)) | |
713 | { | |
714 | int i = TREE_VEC_LENGTH (CLASSTYPE_TI_ARGS (t1)); | |
715 | tree *p1 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t1), 0); | |
716 | tree *p2 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t2), 0); | |
717 | ||
718 | while (i--) | |
719 | { | |
720 | if (TREE_CODE_CLASS (TREE_CODE (p1[i])) == 't') | |
721 | { | |
722 | if (! comptypes (p1[i], p2[i], 1)) | |
723 | return 0; | |
724 | } | |
725 | else | |
726 | { | |
727 | if (simple_cst_equal (p1[i], p2[i]) <= 0) | |
728 | return 0; | |
729 | } | |
730 | } | |
731 | return 1; | |
732 | } | |
8d08fdba MS |
733 | if (strict <= 0) |
734 | goto look_hard; | |
735 | return 0; | |
736 | ||
737 | case OFFSET_TYPE: | |
f30432d7 MS |
738 | val = (comptypes (build_pointer_type (TYPE_OFFSET_BASETYPE (t1)), |
739 | build_pointer_type (TYPE_OFFSET_BASETYPE (t2)), strict) | |
740 | && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)); | |
2986ae00 | 741 | break; |
8d08fdba MS |
742 | |
743 | case METHOD_TYPE: | |
5566b478 | 744 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
745 | return 0; |
746 | ||
747 | /* This case is anti-symmetrical! | |
748 | One can pass a base member (or member function) | |
749 | to something expecting a derived member (or member function), | |
750 | but not vice-versa! */ | |
751 | ||
f30432d7 MS |
752 | val = (comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict) |
753 | && compparms (TYPE_ARG_TYPES (t1), | |
754 | TYPE_ARG_TYPES (t2), strict)); | |
2986ae00 MS |
755 | break; |
756 | ||
8d08fdba MS |
757 | case POINTER_TYPE: |
758 | case REFERENCE_TYPE: | |
759 | t1 = TREE_TYPE (t1); | |
760 | t2 = TREE_TYPE (t2); | |
761 | if (t1 == t2) | |
2986ae00 MS |
762 | { |
763 | val = 1; | |
764 | break; | |
765 | } | |
8d08fdba MS |
766 | if (strict <= 0) |
767 | { | |
768 | if (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE) | |
769 | { | |
770 | int rval; | |
771 | look_hard: | |
772 | rval = t1 == t2 || UNIQUELY_DERIVED_FROM_P (t1, t2); | |
773 | ||
774 | if (rval) | |
2986ae00 MS |
775 | { |
776 | val = 1; | |
777 | break; | |
778 | } | |
8d08fdba | 779 | if (strict < 0) |
2986ae00 MS |
780 | { |
781 | val = UNIQUELY_DERIVED_FROM_P (t2, t1); | |
782 | break; | |
783 | } | |
8d08fdba MS |
784 | } |
785 | return 0; | |
786 | } | |
787 | else | |
2986ae00 MS |
788 | val = comptypes (t1, t2, strict); |
789 | break; | |
8d08fdba MS |
790 | |
791 | case FUNCTION_TYPE: | |
5566b478 | 792 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
793 | return 0; |
794 | ||
2986ae00 MS |
795 | val = ((TREE_TYPE (t1) == TREE_TYPE (t2) |
796 | || comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)) | |
797 | && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); | |
798 | break; | |
8d08fdba MS |
799 | |
800 | case ARRAY_TYPE: | |
801 | /* Target types must match incl. qualifiers. */ | |
2986ae00 MS |
802 | val = comp_array_types (comptypes, t1, t2, strict); |
803 | break; | |
8d08fdba | 804 | |
51c184be | 805 | case TEMPLATE_TYPE_PARM: |
f30432d7 | 806 | return TEMPLATE_TYPE_IDX (t1) == TEMPLATE_TYPE_IDX (t2); |
e76a2646 MS |
807 | |
808 | case TYPENAME_TYPE: | |
809 | if (TYPE_IDENTIFIER (t1) != TYPE_IDENTIFIER (t2)) | |
810 | return 0; | |
811 | return comptypes (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2), 1); | |
8d08fdba | 812 | } |
2986ae00 | 813 | return attrval == 2 && val == 1 ? 2 : val; |
8d08fdba MS |
814 | } |
815 | ||
816 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
817 | ignoring their qualifiers. | |
818 | ||
819 | NPTRS is the number of pointers we can strip off and keep cool. | |
820 | This is used to permit (for aggr A, aggr B) A, B* to convert to A*, | |
821 | but to not permit B** to convert to A**. */ | |
822 | ||
823 | int | |
824 | comp_target_types (ttl, ttr, nptrs) | |
825 | tree ttl, ttr; | |
826 | int nptrs; | |
827 | { | |
828 | ttl = TYPE_MAIN_VARIANT (ttl); | |
829 | ttr = TYPE_MAIN_VARIANT (ttr); | |
830 | if (ttl == ttr) | |
831 | return 1; | |
832 | ||
833 | if (TREE_CODE (ttr) != TREE_CODE (ttl)) | |
834 | return 0; | |
835 | ||
836 | if (TREE_CODE (ttr) == POINTER_TYPE) | |
a0a33927 | 837 | { |
7215f9a0 MS |
838 | ttl = TREE_TYPE (ttl); |
839 | ttr = TREE_TYPE (ttr); | |
840 | ||
841 | if (nptrs > 0) | |
842 | { | |
71851aaa | 843 | if (TREE_CODE (ttl) == VOID_TYPE |
7215f9a0 MS |
844 | && TREE_CODE (ttr) != FUNCTION_TYPE |
845 | && TREE_CODE (ttr) != METHOD_TYPE | |
846 | && TREE_CODE (ttr) != OFFSET_TYPE) | |
847 | return 1; | |
848 | else if (TREE_CODE (ttr) == VOID_TYPE | |
849 | && TREE_CODE (ttl) != FUNCTION_TYPE | |
850 | && TREE_CODE (ttl) != METHOD_TYPE | |
851 | && TREE_CODE (ttl) != OFFSET_TYPE) | |
852 | return -1; | |
71851aaa MS |
853 | else if (TREE_CODE (ttl) == POINTER_TYPE |
854 | || TREE_CODE (ttl) == ARRAY_TYPE) | |
07674418 MS |
855 | { |
856 | if (comp_ptr_ttypes (ttl, ttr)) | |
857 | return 1; | |
858 | else if (comp_ptr_ttypes (ttr, ttl)) | |
859 | return -1; | |
860 | return 0; | |
861 | } | |
7215f9a0 MS |
862 | } |
863 | ||
f30432d7 MS |
864 | /* Const and volatile mean something different for function types, |
865 | so the usual checks are not appropriate. */ | |
866 | if (TREE_CODE (ttl) == FUNCTION_TYPE || TREE_CODE (ttl) == METHOD_TYPE) | |
867 | return comp_target_types (ttl, ttr, nptrs - 1); | |
868 | ||
869 | /* Make sure that the cv-quals change only in the same direction as | |
870 | the target type. */ | |
871 | { | |
872 | int t; | |
873 | int c = TYPE_READONLY (ttl) - TYPE_READONLY (ttr); | |
874 | int v = TYPE_VOLATILE (ttl) - TYPE_VOLATILE (ttr); | |
875 | ||
876 | if ((c > 0 && v < 0) || (c < 0 && v > 0)) | |
877 | return 0; | |
878 | ||
879 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr)) | |
880 | return (c + v < 0) ? -1 : 1; | |
881 | ||
882 | t = comp_target_types (ttl, ttr, nptrs - 1); | |
883 | if ((t == 1 && c + v >= 0) || (t == -1 && c + v <= 0)) | |
884 | return t; | |
885 | ||
886 | return 0; | |
887 | } | |
a0a33927 | 888 | } |
8d08fdba MS |
889 | |
890 | if (TREE_CODE (ttr) == REFERENCE_TYPE) | |
891 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
892 | if (TREE_CODE (ttr) == ARRAY_TYPE) | |
893 | return comp_array_types (comp_target_types, ttl, ttr, 0); | |
894 | else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE) | |
895 | if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
8926095f | 896 | switch (comp_target_parms (TYPE_ARG_TYPES (ttl), TYPE_ARG_TYPES (ttr), 1)) |
8d08fdba MS |
897 | { |
898 | case 0: | |
899 | return 0; | |
900 | case 1: | |
901 | return 1; | |
902 | case 2: | |
e1cd6e56 | 903 | return -1; |
8d08fdba MS |
904 | default: |
905 | my_friendly_abort (112); | |
906 | } | |
907 | else | |
908 | return 0; | |
909 | ||
910 | /* for C++ */ | |
911 | else if (TREE_CODE (ttr) == OFFSET_TYPE) | |
912 | { | |
913 | /* Contravariance: we can assign a pointer to base member to a pointer | |
914 | to derived member. Note difference from simple pointer case, where | |
915 | we can pass a pointer to derived to a pointer to base. */ | |
916 | if (comptypes (TYPE_OFFSET_BASETYPE (ttr), TYPE_OFFSET_BASETYPE (ttl), 0)) | |
917 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
918 | else if (comptypes (TYPE_OFFSET_BASETYPE (ttl), TYPE_OFFSET_BASETYPE (ttr), 0) | |
919 | && comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
e1cd6e56 | 920 | return -1; |
8d08fdba MS |
921 | } |
922 | else if (IS_AGGR_TYPE (ttl)) | |
923 | { | |
924 | if (nptrs < 0) | |
925 | return 0; | |
f30432d7 | 926 | if (comptypes (build_pointer_type (ttl), build_pointer_type (ttr), 0)) |
e1cd6e56 | 927 | return 1; |
f30432d7 | 928 | if (comptypes (build_pointer_type (ttr), build_pointer_type (ttl), 0)) |
e1cd6e56 MS |
929 | return -1; |
930 | return 0; | |
8d08fdba MS |
931 | } |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | /* If two types share a common base type, return that basetype. | |
937 | If there is not a unique most-derived base type, this function | |
938 | returns ERROR_MARK_NODE. */ | |
939 | tree | |
940 | common_base_type (tt1, tt2) | |
941 | tree tt1, tt2; | |
942 | { | |
5566b478 | 943 | tree best = NULL_TREE; |
8d08fdba MS |
944 | int i; |
945 | ||
946 | /* If one is a baseclass of another, that's good enough. */ | |
947 | if (UNIQUELY_DERIVED_FROM_P (tt1, tt2)) | |
948 | return tt1; | |
949 | if (UNIQUELY_DERIVED_FROM_P (tt2, tt1)) | |
950 | return tt2; | |
951 | ||
8d08fdba MS |
952 | /* Otherwise, try to find a unique baseclass of TT1 |
953 | that is shared by TT2, and follow that down. */ | |
954 | for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--) | |
955 | { | |
956 | tree basetype = TYPE_BINFO_BASETYPE (tt1, i); | |
957 | tree trial = common_base_type (basetype, tt2); | |
958 | if (trial) | |
959 | { | |
960 | if (trial == error_mark_node) | |
961 | return trial; | |
962 | if (best == NULL_TREE) | |
963 | best = trial; | |
964 | else if (best != trial) | |
965 | return error_mark_node; | |
966 | } | |
967 | } | |
968 | ||
969 | /* Same for TT2. */ | |
970 | for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--) | |
971 | { | |
972 | tree basetype = TYPE_BINFO_BASETYPE (tt2, i); | |
973 | tree trial = common_base_type (tt1, basetype); | |
974 | if (trial) | |
975 | { | |
976 | if (trial == error_mark_node) | |
977 | return trial; | |
978 | if (best == NULL_TREE) | |
979 | best = trial; | |
980 | else if (best != trial) | |
981 | return error_mark_node; | |
982 | } | |
983 | } | |
984 | return best; | |
985 | } | |
986 | \f | |
987 | /* Subroutines of `comptypes'. */ | |
988 | ||
989 | /* Return 1 if two parameter type lists PARMS1 and PARMS2 | |
990 | are equivalent in the sense that functions with those parameter types | |
991 | can have equivalent types. | |
992 | If either list is empty, we win. | |
993 | Otherwise, the two lists must be equivalent, element by element. | |
994 | ||
995 | C++: See comment above about TYPE1, TYPE2, STRICT. | |
996 | If STRICT == 3, it means checking is strict, but do not compare | |
997 | default parameter values. */ | |
998 | int | |
999 | compparms (parms1, parms2, strict) | |
1000 | tree parms1, parms2; | |
1001 | int strict; | |
1002 | { | |
1003 | register tree t1 = parms1, t2 = parms2; | |
1004 | ||
1005 | /* An unspecified parmlist matches any specified parmlist | |
1006 | whose argument types don't need default promotions. */ | |
1007 | ||
8926095f MS |
1008 | if (strict <= 0 && t1 == 0) |
1009 | return self_promoting_args_p (t2); | |
1010 | if (strict < 0 && t2 == 0) | |
1011 | return self_promoting_args_p (t1); | |
8d08fdba MS |
1012 | |
1013 | while (1) | |
1014 | { | |
1015 | if (t1 == 0 && t2 == 0) | |
1016 | return 1; | |
1017 | /* If one parmlist is shorter than the other, | |
1018 | they fail to match, unless STRICT is <= 0. */ | |
1019 | if (t1 == 0 || t2 == 0) | |
1020 | { | |
1021 | if (strict > 0) | |
1022 | return 0; | |
1023 | if (strict < 0) | |
1024 | return 1; | |
1025 | if (strict == 0) | |
1026 | return t1 && TREE_PURPOSE (t1); | |
1027 | } | |
1028 | if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict)) | |
1029 | { | |
1030 | if (strict > 0) | |
1031 | return 0; | |
1032 | if (strict == 0) | |
1033 | return t2 == void_list_node && TREE_PURPOSE (t1); | |
1034 | return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); | |
1035 | } | |
8d08fdba MS |
1036 | |
1037 | t1 = TREE_CHAIN (t1); | |
1038 | t2 = TREE_CHAIN (t2); | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | /* This really wants return whether or not parameter type lists | |
1043 | would make their owning functions assignment compatible or not. */ | |
1044 | int | |
1045 | comp_target_parms (parms1, parms2, strict) | |
1046 | tree parms1, parms2; | |
1047 | int strict; | |
1048 | { | |
1049 | register tree t1 = parms1, t2 = parms2; | |
1050 | int warn_contravariance = 0; | |
1051 | ||
1052 | /* An unspecified parmlist matches any specified parmlist | |
1053 | whose argument types don't need default promotions. | |
1054 | @@@ see 13.3.3 for a counterexample... */ | |
1055 | ||
1056 | if (t1 == 0 && t2 != 0) | |
1057 | { | |
1058 | cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'", | |
1059 | parms2); | |
1060 | return self_promoting_args_p (t2); | |
1061 | } | |
1062 | if (t2 == 0) | |
1063 | return self_promoting_args_p (t1); | |
1064 | ||
1065 | for (; t1 || t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) | |
1066 | { | |
1067 | tree p1, p2; | |
1068 | ||
1069 | /* If one parmlist is shorter than the other, | |
1070 | they fail to match, unless STRICT is <= 0. */ | |
1071 | if (t1 == 0 || t2 == 0) | |
1072 | { | |
1073 | if (strict > 0) | |
1074 | return 0; | |
1075 | if (strict < 0) | |
1076 | return 1 + warn_contravariance; | |
1077 | return ((t1 && TREE_PURPOSE (t1)) + warn_contravariance); | |
1078 | } | |
1079 | p1 = TREE_VALUE (t1); | |
1080 | p2 = TREE_VALUE (t2); | |
1081 | if (p1 == p2) | |
1082 | continue; | |
7177d104 | 1083 | |
8d08fdba MS |
1084 | if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE) |
1085 | || (TREE_CODE (p1) == REFERENCE_TYPE && TREE_CODE (p2) == REFERENCE_TYPE)) | |
1086 | { | |
1087 | if (strict <= 0 | |
1088 | && (TYPE_MAIN_VARIANT (TREE_TYPE (p1)) | |
1089 | == TYPE_MAIN_VARIANT (TREE_TYPE (p2)))) | |
1090 | continue; | |
1091 | ||
1092 | /* The following is wrong for contravariance, | |
1093 | but many programs depend on it. */ | |
1094 | if (TREE_TYPE (p1) == void_type_node) | |
1095 | continue; | |
1096 | if (TREE_TYPE (p2) == void_type_node) | |
1097 | { | |
1098 | warn_contravariance = 1; | |
1099 | continue; | |
1100 | } | |
1101 | if (IS_AGGR_TYPE (TREE_TYPE (p1))) | |
1102 | { | |
1103 | if (comptypes (p2, p1, 0) == 0) | |
1104 | { | |
1105 | if (comptypes (p1, p2, 0) != 0) | |
1106 | warn_contravariance = 1; | |
1107 | else | |
1108 | return 0; | |
1109 | } | |
1110 | continue; | |
1111 | } | |
1112 | } | |
1113 | /* Note backwards order due to contravariance. */ | |
1114 | if (comp_target_types (p2, p1, 1) == 0) | |
1115 | { | |
1116 | if (comp_target_types (p1, p2, 1)) | |
1117 | { | |
1118 | warn_contravariance = 1; | |
1119 | continue; | |
1120 | } | |
1121 | if (strict != 0) | |
1122 | return 0; | |
8d08fdba MS |
1123 | } |
1124 | /* Target types are compatible--just make sure that if | |
1125 | we use parameter lists, that they are ok as well. */ | |
1126 | if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE) | |
1127 | switch (comp_target_parms (TYPE_ARG_TYPES (p1), | |
1128 | TYPE_ARG_TYPES (p2), | |
1129 | strict)) | |
1130 | { | |
1131 | case 0: | |
1132 | return 0; | |
1133 | case 1: | |
1134 | break; | |
1135 | case 2: | |
1136 | warn_contravariance = 1; | |
1137 | } | |
1138 | ||
1139 | if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) | |
1140 | { | |
1141 | int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); | |
1142 | if (cmp < 0) | |
1143 | my_friendly_abort (114); | |
1144 | if (cmp == 0) | |
1145 | return 0; | |
1146 | } | |
1147 | } | |
1148 | return 1 + warn_contravariance; | |
1149 | } | |
1150 | ||
1151 | /* Return 1 if PARMS specifies a fixed number of parameters | |
1152 | and none of their types is affected by default promotions. */ | |
1153 | ||
8926095f | 1154 | int |
8d08fdba MS |
1155 | self_promoting_args_p (parms) |
1156 | tree parms; | |
1157 | { | |
1158 | register tree t; | |
1159 | for (t = parms; t; t = TREE_CHAIN (t)) | |
1160 | { | |
1161 | register tree type = TREE_VALUE (t); | |
1162 | ||
1163 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
1164 | return 0; | |
1165 | ||
cffa8729 | 1166 | if (type == 0) |
8d08fdba MS |
1167 | return 0; |
1168 | ||
cffa8729 | 1169 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
8d08fdba MS |
1170 | return 0; |
1171 | ||
1172 | if (C_PROMOTING_INTEGER_TYPE_P (type)) | |
1173 | return 0; | |
1174 | } | |
1175 | return 1; | |
1176 | } | |
1177 | \f | |
1178 | /* Return an unsigned type the same as TYPE in other respects. | |
1179 | ||
1180 | C++: must make these work for type variants as well. */ | |
1181 | ||
1182 | tree | |
1183 | unsigned_type (type) | |
1184 | tree type; | |
1185 | { | |
1186 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1187 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1188 | return unsigned_char_type_node; | |
1189 | if (type1 == integer_type_node) | |
1190 | return unsigned_type_node; | |
1191 | if (type1 == short_integer_type_node) | |
1192 | return short_unsigned_type_node; | |
1193 | if (type1 == long_integer_type_node) | |
1194 | return long_unsigned_type_node; | |
1195 | if (type1 == long_long_integer_type_node) | |
1196 | return long_long_unsigned_type_node; | |
cffa8729 MS |
1197 | if (type1 == intDI_type_node) |
1198 | return unsigned_intDI_type_node; | |
1199 | if (type1 == intSI_type_node) | |
1200 | return unsigned_intSI_type_node; | |
1201 | if (type1 == intHI_type_node) | |
1202 | return unsigned_intHI_type_node; | |
1203 | if (type1 == intQI_type_node) | |
1204 | return unsigned_intQI_type_node; | |
8d08fdba MS |
1205 | return type; |
1206 | } | |
1207 | ||
1208 | /* Return a signed type the same as TYPE in other respects. */ | |
1209 | ||
1210 | tree | |
1211 | signed_type (type) | |
1212 | tree type; | |
1213 | { | |
1214 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1215 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1216 | return signed_char_type_node; | |
1217 | if (type1 == unsigned_type_node) | |
1218 | return integer_type_node; | |
1219 | if (type1 == short_unsigned_type_node) | |
1220 | return short_integer_type_node; | |
1221 | if (type1 == long_unsigned_type_node) | |
1222 | return long_integer_type_node; | |
1223 | if (type1 == long_long_unsigned_type_node) | |
1224 | return long_long_integer_type_node; | |
cffa8729 MS |
1225 | if (type1 == unsigned_intDI_type_node) |
1226 | return intDI_type_node; | |
1227 | if (type1 == unsigned_intSI_type_node) | |
1228 | return intSI_type_node; | |
1229 | if (type1 == unsigned_intHI_type_node) | |
1230 | return intHI_type_node; | |
1231 | if (type1 == unsigned_intQI_type_node) | |
1232 | return intQI_type_node; | |
8d08fdba MS |
1233 | return type; |
1234 | } | |
1235 | ||
1236 | /* Return a type the same as TYPE except unsigned or | |
1237 | signed according to UNSIGNEDP. */ | |
1238 | ||
1239 | tree | |
1240 | signed_or_unsigned_type (unsignedp, type) | |
1241 | int unsignedp; | |
1242 | tree type; | |
1243 | { | |
39211cd5 | 1244 | if (! INTEGRAL_TYPE_P (type)) |
8d08fdba MS |
1245 | return type; |
1246 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) | |
1247 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1248 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
1249 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1250 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
1251 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1252 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
1253 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1254 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
1255 | return (unsignedp ? long_long_unsigned_type_node | |
1256 | : long_long_integer_type_node); | |
1257 | return type; | |
1258 | } | |
1259 | ||
cffa8729 MS |
1260 | /* Compute the value of the `sizeof' operator. */ |
1261 | ||
8d08fdba MS |
1262 | tree |
1263 | c_sizeof (type) | |
1264 | tree type; | |
1265 | { | |
1266 | enum tree_code code = TREE_CODE (type); | |
1267 | tree t; | |
1268 | ||
5566b478 MS |
1269 | if (current_template_parms) |
1270 | return build_min (SIZEOF_EXPR, sizetype, type); | |
1271 | ||
8d08fdba MS |
1272 | if (code == FUNCTION_TYPE) |
1273 | { | |
1274 | if (pedantic || warn_pointer_arith) | |
1275 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1276 | return size_int (1); | |
1277 | } | |
1278 | if (code == METHOD_TYPE) | |
1279 | { | |
1280 | if (pedantic || warn_pointer_arith) | |
1281 | pedwarn ("ANSI C++ forbids taking the sizeof a method type"); | |
1282 | return size_int (1); | |
1283 | } | |
1284 | if (code == VOID_TYPE) | |
1285 | { | |
1286 | if (pedantic || warn_pointer_arith) | |
1287 | pedwarn ("ANSI C++ forbids taking the sizeof a void type"); | |
1288 | return size_int (1); | |
1289 | } | |
1290 | if (code == ERROR_MARK) | |
1291 | return size_int (1); | |
1292 | ||
1293 | /* ARM $5.3.2: ``When applied to a reference, the result is the size of the | |
1294 | referenced object.'' */ | |
1295 | if (code == REFERENCE_TYPE) | |
1296 | type = TREE_TYPE (type); | |
1297 | ||
1298 | /* We couldn't find anything in the ARM or the draft standard that says, | |
1299 | one way or the other, if doing sizeof on something that doesn't have | |
1300 | an object associated with it is correct or incorrect. For example, if | |
1301 | you declare `struct S { char str[16]; };', and in your program do | |
1302 | a `sizeof (S::str)', should we flag that as an error or should we give | |
1303 | the size of it? Since it seems like a reasonable thing to do, we'll go | |
1304 | with giving the value. */ | |
1305 | if (code == OFFSET_TYPE) | |
1306 | type = TREE_TYPE (type); | |
1307 | ||
1308 | /* @@ This also produces an error for a signature ref. | |
1309 | In that case we should be able to do better. */ | |
1310 | if (IS_SIGNATURE (type)) | |
1311 | { | |
1312 | error ("`sizeof' applied to a signature type"); | |
1313 | return size_int (0); | |
1314 | } | |
1315 | ||
5566b478 | 1316 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba | 1317 | { |
5566b478 | 1318 | cp_error ("`sizeof' applied to incomplete type `%T'", type); |
8d08fdba MS |
1319 | return size_int (0); |
1320 | } | |
1321 | ||
1322 | /* Convert in case a char is more than one unit. */ | |
1323 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
1324 | size_int (TYPE_PRECISION (char_type_node))); | |
1325 | /* size_binop does not put the constant in range, so do it now. */ | |
1326 | if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) | |
1327 | TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; | |
1328 | return t; | |
1329 | } | |
1330 | ||
5566b478 MS |
1331 | tree |
1332 | expr_sizeof (e) | |
1333 | tree e; | |
1334 | { | |
1335 | if (current_template_parms) | |
1336 | return build_min (SIZEOF_EXPR, sizetype, e); | |
1337 | ||
1338 | if (TREE_CODE (e) == COMPONENT_REF | |
1339 | && DECL_BIT_FIELD (TREE_OPERAND (e, 1))) | |
1340 | error ("sizeof applied to a bit-field"); | |
1341 | /* ANSI says arrays and functions are converted inside comma. | |
1342 | But we can't really convert them in build_compound_expr | |
1343 | because that would break commas in lvalues. | |
1344 | So do the conversion here if operand was a comma. */ | |
1345 | if (TREE_CODE (e) == COMPOUND_EXPR | |
1346 | && (TREE_CODE (TREE_TYPE (e)) == ARRAY_TYPE | |
1347 | || TREE_CODE (TREE_TYPE (e)) == FUNCTION_TYPE)) | |
1348 | e = default_conversion (e); | |
1349 | else if (TREE_CODE (e) == TREE_LIST) | |
1350 | { | |
1351 | tree t = TREE_VALUE (e); | |
1352 | if (t != NULL_TREE | |
1353 | && ((TREE_TYPE (t) | |
1354 | && TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE) | |
1355 | || is_overloaded_fn (t))) | |
1356 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1357 | } | |
1358 | return c_sizeof (TREE_TYPE (e)); | |
1359 | } | |
1360 | ||
8d08fdba MS |
1361 | tree |
1362 | c_sizeof_nowarn (type) | |
1363 | tree type; | |
1364 | { | |
1365 | enum tree_code code = TREE_CODE (type); | |
1366 | tree t; | |
1367 | ||
1368 | if (code == FUNCTION_TYPE | |
1369 | || code == METHOD_TYPE | |
1370 | || code == VOID_TYPE | |
1371 | || code == ERROR_MARK) | |
1372 | return size_int (1); | |
1373 | if (code == REFERENCE_TYPE) | |
1374 | type = TREE_TYPE (type); | |
1375 | ||
1376 | if (TYPE_SIZE (type) == 0) | |
9e9ff709 | 1377 | return size_int (0); |
8d08fdba MS |
1378 | |
1379 | /* Convert in case a char is more than one unit. */ | |
1380 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
e1cd6e56 | 1381 | size_int (TYPE_PRECISION (char_type_node))); |
8d08fdba MS |
1382 | force_fit_type (t, 0); |
1383 | return t; | |
1384 | } | |
1385 | ||
1386 | /* Implement the __alignof keyword: Return the minimum required | |
1387 | alignment of TYPE, measured in bytes. */ | |
1388 | ||
1389 | tree | |
1390 | c_alignof (type) | |
1391 | tree type; | |
1392 | { | |
1393 | enum tree_code code = TREE_CODE (type); | |
1394 | tree t; | |
1395 | ||
1396 | if (code == FUNCTION_TYPE || code == METHOD_TYPE) | |
1397 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
1398 | ||
1399 | if (code == VOID_TYPE || code == ERROR_MARK) | |
1400 | return size_int (1); | |
1401 | ||
1402 | /* C++: this is really correct! */ | |
1403 | if (code == REFERENCE_TYPE) | |
1404 | type = TREE_TYPE (type); | |
1405 | ||
1406 | /* @@ This also produces an error for a signature ref. | |
1407 | In that case we should be able to do better. */ | |
1408 | if (IS_SIGNATURE (type)) | |
1409 | { | |
1410 | error ("`__alignof' applied to a signature type"); | |
1411 | return size_int (1); | |
1412 | } | |
1413 | ||
1414 | t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
1415 | force_fit_type (t, 0); | |
1416 | return t; | |
1417 | } | |
1418 | \f | |
1419 | /* Perform default promotions for C data used in expressions. | |
1420 | Arrays and functions are converted to pointers; | |
1421 | enumeral types or short or char, to int. | |
1422 | In addition, manifest constants symbols are replaced by their values. | |
1423 | ||
1424 | C++: this will automatically bash references to their target type. */ | |
1425 | ||
1426 | tree | |
a9aedbc2 | 1427 | decay_conversion (exp) |
8d08fdba MS |
1428 | tree exp; |
1429 | { | |
1430 | register tree type = TREE_TYPE (exp); | |
1431 | register enum tree_code code = TREE_CODE (type); | |
1432 | ||
1433 | if (code == OFFSET_TYPE /* || TREE_CODE (exp) == OFFSET_REF */ ) | |
1434 | { | |
1435 | if (TREE_CODE (exp) == OFFSET_REF) | |
a9aedbc2 | 1436 | return decay_conversion (resolve_offset_ref (exp)); |
8d08fdba MS |
1437 | |
1438 | type = TREE_TYPE (type); | |
1439 | code = TREE_CODE (type); | |
1440 | } | |
1441 | ||
1442 | if (code == REFERENCE_TYPE) | |
1443 | { | |
1444 | exp = convert_from_reference (exp); | |
1445 | type = TREE_TYPE (exp); | |
1446 | code = TREE_CODE (type); | |
1447 | } | |
1448 | ||
1449 | /* Constants can be used directly unless they're not loadable. */ | |
1450 | if (TREE_CODE (exp) == CONST_DECL) | |
1451 | exp = DECL_INITIAL (exp); | |
1452 | /* Replace a nonvolatile const static variable with its value. */ | |
fd378c9d | 1453 | else if (TREE_READONLY_DECL_P (exp)) |
8d08fdba MS |
1454 | { |
1455 | exp = decl_constant_value (exp); | |
1456 | type = TREE_TYPE (exp); | |
1457 | } | |
1458 | ||
1459 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
1460 | Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ | |
1461 | ||
8d08fdba MS |
1462 | if (code == VOID_TYPE) |
1463 | { | |
1464 | error ("void value not ignored as it ought to be"); | |
1465 | return error_mark_node; | |
1466 | } | |
1467 | if (code == FUNCTION_TYPE) | |
1468 | { | |
1469 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1470 | } | |
1471 | if (code == METHOD_TYPE) | |
1472 | { | |
4ac14744 | 1473 | cp_pedwarn ("assuming & on `%E'", exp); |
8d08fdba MS |
1474 | return build_unary_op (ADDR_EXPR, exp, 0); |
1475 | } | |
1476 | if (code == ARRAY_TYPE) | |
1477 | { | |
1478 | register tree adr; | |
1479 | tree restype; | |
1480 | tree ptrtype; | |
1481 | int constp, volatilep; | |
1482 | ||
1483 | if (TREE_CODE (exp) == INDIRECT_REF) | |
1484 | { | |
1485 | /* Stripping away the INDIRECT_REF is not the right | |
1486 | thing to do for references... */ | |
1487 | tree inner = TREE_OPERAND (exp, 0); | |
1488 | if (TREE_CODE (TREE_TYPE (inner)) == REFERENCE_TYPE) | |
1489 | { | |
1490 | inner = build1 (CONVERT_EXPR, | |
1491 | build_pointer_type (TREE_TYPE (TREE_TYPE (inner))), | |
1492 | inner); | |
1493 | TREE_REFERENCE_EXPR (inner) = 1; | |
1494 | } | |
f30432d7 | 1495 | return convert (build_pointer_type (TREE_TYPE (type)), inner); |
8d08fdba MS |
1496 | } |
1497 | ||
1498 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
1499 | { | |
a9aedbc2 | 1500 | tree op1 = decay_conversion (TREE_OPERAND (exp, 1)); |
8d08fdba MS |
1501 | return build (COMPOUND_EXPR, TREE_TYPE (op1), |
1502 | TREE_OPERAND (exp, 0), op1); | |
1503 | } | |
1504 | ||
1505 | if (!lvalue_p (exp) | |
1506 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) | |
1507 | { | |
1508 | error ("invalid use of non-lvalue array"); | |
1509 | return error_mark_node; | |
1510 | } | |
1511 | ||
1512 | constp = volatilep = 0; | |
1513 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' | |
1514 | || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
1515 | { | |
1516 | constp = TREE_READONLY (exp); | |
1517 | volatilep = TREE_THIS_VOLATILE (exp); | |
1518 | } | |
1519 | ||
1520 | restype = TREE_TYPE (type); | |
1521 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type) | |
1522 | || constp || volatilep) | |
f376e137 | 1523 | restype = cp_build_type_variant (restype, |
21474714 MS |
1524 | TYPE_READONLY (type) || constp, |
1525 | TYPE_VOLATILE (type) || volatilep); | |
8d08fdba MS |
1526 | ptrtype = build_pointer_type (restype); |
1527 | ||
1528 | if (TREE_CODE (exp) == VAR_DECL) | |
1529 | { | |
1530 | /* ??? This is not really quite correct | |
1531 | in that the type of the operand of ADDR_EXPR | |
1532 | is not the target type of the type of the ADDR_EXPR itself. | |
1533 | Question is, can this lossage be avoided? */ | |
1534 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1535 | if (mark_addressable (exp) == 0) | |
1536 | return error_mark_node; | |
1537 | TREE_CONSTANT (adr) = staticp (exp); | |
1538 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1539 | return adr; | |
1540 | } | |
1541 | /* This way is better for a COMPONENT_REF since it can | |
1542 | simplify the offset for a component. */ | |
1543 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1544 | return convert (ptrtype, adr); | |
1545 | } | |
a9aedbc2 MS |
1546 | |
1547 | return exp; | |
1548 | } | |
1549 | ||
1550 | tree | |
1551 | default_conversion (exp) | |
1552 | tree exp; | |
1553 | { | |
1554 | tree type; | |
1555 | enum tree_code code; | |
1556 | ||
1557 | exp = decay_conversion (exp); | |
1558 | ||
1559 | type = TREE_TYPE (exp); | |
1560 | code = TREE_CODE (type); | |
1561 | ||
1562 | if (INTEGRAL_CODE_P (code)) | |
1563 | { | |
1564 | tree t = type_promotes_to (type); | |
1565 | if (t != type) | |
1566 | return convert (t, exp); | |
1567 | } | |
1568 | if (flag_traditional | |
1569 | && TYPE_MAIN_VARIANT (type) == float_type_node) | |
1570 | return convert (double_type_node, exp); | |
1571 | ||
8d08fdba MS |
1572 | return exp; |
1573 | } | |
6b5fbb55 MS |
1574 | |
1575 | /* Take the address of an inline function without setting TREE_ADDRESSABLE | |
1576 | or TREE_USED. */ | |
1577 | ||
1578 | tree | |
1579 | inline_conversion (exp) | |
1580 | tree exp; | |
1581 | { | |
1582 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
1583 | { | |
1584 | tree type = build_type_variant | |
1585 | (TREE_TYPE (exp), TREE_READONLY (exp), TREE_THIS_VOLATILE (exp)); | |
1586 | exp = build1 (ADDR_EXPR, build_pointer_type (type), exp); | |
1587 | } | |
1588 | return exp; | |
1589 | } | |
8d08fdba MS |
1590 | \f |
1591 | tree | |
1592 | build_object_ref (datum, basetype, field) | |
1593 | tree datum, basetype, field; | |
1594 | { | |
a292b002 | 1595 | tree dtype; |
8d08fdba MS |
1596 | if (datum == error_mark_node) |
1597 | return error_mark_node; | |
a292b002 MS |
1598 | |
1599 | dtype = TREE_TYPE (datum); | |
1600 | if (TREE_CODE (dtype) == REFERENCE_TYPE) | |
1601 | dtype = TREE_TYPE (dtype); | |
1602 | if (! IS_AGGR_TYPE_CODE (TREE_CODE (dtype))) | |
1603 | { | |
1604 | cp_error ("request for member `%T::%D' in expression of non-aggregate type `%T'", | |
1605 | basetype, field, dtype); | |
1606 | return error_mark_node; | |
1607 | } | |
be99da77 | 1608 | else if (IS_SIGNATURE (basetype)) |
8d08fdba MS |
1609 | { |
1610 | warning ("signature name in scope resolution ignored"); | |
1611 | return build_component_ref (datum, field, NULL_TREE, 1); | |
1612 | } | |
be99da77 | 1613 | else if (is_aggr_type (basetype, 1)) |
8d08fdba | 1614 | { |
45537677 | 1615 | tree binfo = binfo_or_else (basetype, dtype); |
a4443a08 | 1616 | if (binfo) |
8d08fdba | 1617 | return build_component_ref (build_scoped_ref (datum, basetype), |
a4443a08 | 1618 | field, binfo, 1); |
8d08fdba MS |
1619 | } |
1620 | return error_mark_node; | |
1621 | } | |
1622 | ||
1623 | /* Like `build_component_ref, but uses an already found field. | |
4ac14744 | 1624 | Must compute access for current_class_ref. Otherwise, ok. */ |
8d08fdba MS |
1625 | tree |
1626 | build_component_ref_1 (datum, field, protect) | |
1627 | tree datum, field; | |
1628 | int protect; | |
1629 | { | |
1630 | register tree basetype = TREE_TYPE (datum); | |
1631 | register enum tree_code code = TREE_CODE (basetype); | |
1632 | register tree ref; | |
1633 | ||
1634 | if (code == REFERENCE_TYPE) | |
1635 | { | |
1636 | datum = convert_from_reference (datum); | |
1637 | basetype = TREE_TYPE (datum); | |
1638 | code = TREE_CODE (basetype); | |
1639 | } | |
1640 | ||
1641 | if (! IS_AGGR_TYPE_CODE (code)) | |
1642 | { | |
1643 | if (code != ERROR_MARK) | |
1644 | cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", | |
1645 | field, datum, basetype); | |
1646 | return error_mark_node; | |
1647 | } | |
1648 | ||
1649 | if (TYPE_SIZE (basetype) == 0) | |
1650 | { | |
1651 | incomplete_type_error (0, basetype); | |
1652 | return error_mark_node; | |
1653 | } | |
1654 | ||
1655 | /* Look up component name in the structure type definition. */ | |
1656 | ||
1657 | if (field == error_mark_node) | |
1658 | my_friendly_abort (115); | |
1659 | ||
1660 | if (TREE_STATIC (field)) | |
1661 | return field; | |
1662 | ||
4ac14744 | 1663 | if (datum == current_class_ref) |
8d08fdba | 1664 | { |
be99da77 | 1665 | tree access = compute_access (TYPE_BINFO (current_class_type), field); |
8d08fdba | 1666 | |
be99da77 | 1667 | if (access == access_private_node) |
8d08fdba MS |
1668 | { |
1669 | cp_error ("field `%D' is private", field); | |
1670 | return error_mark_node; | |
1671 | } | |
be99da77 | 1672 | else if (access == access_protected_node) |
8d08fdba MS |
1673 | { |
1674 | cp_error ("field `%D' is protected", field); | |
1675 | return error_mark_node; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | ref = build (COMPONENT_REF, TREE_TYPE (field), datum, field); | |
1680 | ||
1681 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1682 | TREE_READONLY (ref) = 1; | |
1683 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1684 | TREE_THIS_VOLATILE (ref) = 1; | |
1685 | if (DECL_MUTABLE_P (field)) | |
1686 | TREE_READONLY (ref) = 0; | |
1687 | ||
1688 | return ref; | |
1689 | } | |
1690 | ||
1691 | /* Given a COND_EXPR in T, return it in a form that we can, for | |
1692 | example, use as an lvalue. This code used to be in unary_complex_lvalue, | |
1693 | but we needed it to deal with `a = (d == c) ? b : c' expressions, where | |
1694 | we're dealing with aggregates. So, we now call this in unary_complex_lvalue, | |
1695 | and in build_modify_expr. The case (in particular) that led to this was | |
1696 | with CODE == ADDR_EXPR, since it's not an lvalue when we'd get it there. */ | |
1697 | static tree | |
1698 | rationalize_conditional_expr (code, t) | |
1699 | enum tree_code code; | |
1700 | tree t; | |
1701 | { | |
1702 | return | |
1703 | build_conditional_expr (TREE_OPERAND (t, 0), | |
1704 | build_unary_op (code, TREE_OPERAND (t, 1), 0), | |
1705 | build_unary_op (code, TREE_OPERAND (t, 2), 0)); | |
1706 | } | |
1707 | ||
9e9ff709 MS |
1708 | /* Given the TYPE of an anonymous union field inside T, return the |
1709 | FIELD_DECL for the field. If not found return NULL_TREE. Because | |
1710 | anonymous unions can nest, we must also search all anonymous unions | |
1711 | that are directly reachable. */ | |
1712 | static tree | |
1713 | lookup_anon_field (t, type) | |
1714 | tree t, type; | |
1715 | { | |
1716 | tree field; | |
1717 | ||
1718 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
1719 | { | |
1720 | if (TREE_STATIC (field)) | |
1721 | continue; | |
1722 | if (TREE_CODE (field) != FIELD_DECL) | |
1723 | continue; | |
1724 | ||
1725 | /* If we find it directly, return the field. */ | |
1726 | if (DECL_NAME (field) == NULL_TREE | |
1727 | && type == TREE_TYPE (field)) | |
1728 | { | |
1729 | return field; | |
1730 | } | |
1731 | ||
1732 | /* Otherwise, it could be nested, search harder. */ | |
1733 | if (DECL_NAME (field) == NULL_TREE | |
1734 | && TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
1735 | { | |
1736 | tree subfield = lookup_anon_field (TREE_TYPE (field), type); | |
1737 | if (subfield) | |
1738 | return subfield; | |
1739 | } | |
1740 | } | |
1741 | return NULL_TREE; | |
1742 | } | |
1743 | ||
1744 | /* Build a COMPONENT_REF for a given DATUM, and it's member COMPONENT. | |
1745 | COMPONENT can be an IDENTIFIER_NODE that is the name of the member | |
1746 | that we are interested in, or it can be a FIELD_DECL. */ | |
8d08fdba MS |
1747 | tree |
1748 | build_component_ref (datum, component, basetype_path, protect) | |
1749 | tree datum, component, basetype_path; | |
1750 | int protect; | |
1751 | { | |
1752 | register tree basetype = TREE_TYPE (datum); | |
5566b478 | 1753 | register enum tree_code code; |
8d08fdba MS |
1754 | register tree field = NULL; |
1755 | register tree ref; | |
1756 | ||
5566b478 MS |
1757 | if (current_template_parms) |
1758 | return build_min_nt (COMPONENT_REF, datum, component); | |
1759 | ||
f376e137 | 1760 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference inside it. */ |
8d08fdba MS |
1761 | switch (TREE_CODE (datum)) |
1762 | { | |
1763 | case COMPOUND_EXPR: | |
1764 | { | |
1765 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component, | |
1766 | basetype_path, protect); | |
1767 | return build (COMPOUND_EXPR, TREE_TYPE (value), | |
1768 | TREE_OPERAND (datum, 0), value); | |
1769 | } | |
1770 | case COND_EXPR: | |
1771 | return build_conditional_expr | |
1772 | (TREE_OPERAND (datum, 0), | |
1773 | build_component_ref (TREE_OPERAND (datum, 1), component, | |
1774 | basetype_path, protect), | |
1775 | build_component_ref (TREE_OPERAND (datum, 2), component, | |
1776 | basetype_path, protect)); | |
1777 | } | |
1778 | ||
5566b478 MS |
1779 | code = TREE_CODE (basetype); |
1780 | ||
8d08fdba MS |
1781 | if (code == REFERENCE_TYPE) |
1782 | { | |
9e9ff709 | 1783 | datum = convert_from_reference (datum); |
8d08fdba MS |
1784 | basetype = TREE_TYPE (datum); |
1785 | code = TREE_CODE (basetype); | |
1786 | } | |
fc378698 MS |
1787 | if (TREE_CODE (datum) == OFFSET_REF) |
1788 | { | |
1789 | datum = resolve_offset_ref (datum); | |
1790 | basetype = TREE_TYPE (datum); | |
1791 | code = TREE_CODE (basetype); | |
1792 | } | |
8d08fdba MS |
1793 | |
1794 | /* First, see if there is a field or component with name COMPONENT. */ | |
1795 | if (TREE_CODE (component) == TREE_LIST) | |
1796 | { | |
1797 | my_friendly_assert (!(TREE_CHAIN (component) == NULL_TREE | |
1798 | && DECL_CHAIN (TREE_VALUE (component)) == NULL_TREE), 309); | |
1799 | return build (COMPONENT_REF, TREE_TYPE (component), datum, component); | |
1800 | } | |
8d08fdba MS |
1801 | |
1802 | if (! IS_AGGR_TYPE_CODE (code)) | |
1803 | { | |
1804 | if (code != ERROR_MARK) | |
1805 | cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", | |
1806 | component, datum, basetype); | |
1807 | return error_mark_node; | |
1808 | } | |
1809 | ||
5566b478 | 1810 | if (TYPE_SIZE (complete_type (basetype)) == 0) |
8d08fdba MS |
1811 | { |
1812 | incomplete_type_error (0, basetype); | |
1813 | return error_mark_node; | |
1814 | } | |
1815 | ||
1816 | if (TREE_CODE (component) == BIT_NOT_EXPR) | |
1817 | { | |
1818 | if (TYPE_IDENTIFIER (basetype) != TREE_OPERAND (component, 0)) | |
1819 | { | |
1820 | cp_error ("destructor specifier `%T::~%T' must have matching names", | |
1821 | basetype, TREE_OPERAND (component, 0)); | |
1822 | return error_mark_node; | |
1823 | } | |
1824 | if (! TYPE_HAS_DESTRUCTOR (basetype)) | |
1825 | { | |
1826 | cp_error ("type `%T' has no destructor", basetype); | |
1827 | return error_mark_node; | |
1828 | } | |
fc378698 | 1829 | return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 1); |
8d08fdba MS |
1830 | } |
1831 | ||
1832 | /* Look up component name in the structure type definition. */ | |
1833 | if (CLASSTYPE_VFIELD (basetype) | |
1834 | && DECL_NAME (CLASSTYPE_VFIELD (basetype)) == component) | |
1835 | /* Special-case this because if we use normal lookups in an ambiguous | |
1836 | hierarchy, the compiler will abort (because vptr lookups are | |
1837 | not supposed to be ambiguous. */ | |
1838 | field = CLASSTYPE_VFIELD (basetype); | |
9e9ff709 MS |
1839 | else if (TREE_CODE (component) == FIELD_DECL) |
1840 | { | |
1841 | field = component; | |
1842 | } | |
8d08fdba MS |
1843 | else |
1844 | { | |
1845 | if (basetype_path == NULL_TREE) | |
1846 | basetype_path = TYPE_BINFO (basetype); | |
1847 | field = lookup_field (basetype_path, component, | |
1848 | protect && ! VFIELD_NAME_P (component), 0); | |
1849 | if (field == error_mark_node) | |
1850 | return error_mark_node; | |
1851 | ||
1852 | if (field == NULL_TREE) | |
1853 | { | |
1854 | /* Not found as a data field, look for it as a method. If found, | |
1855 | then if this is the only possible one, return it, else | |
1856 | report ambiguity error. */ | |
1857 | tree fndecls = lookup_fnfields (basetype_path, component, 1); | |
1858 | if (fndecls == error_mark_node) | |
1859 | return error_mark_node; | |
1860 | if (fndecls) | |
1861 | { | |
1862 | if (TREE_CHAIN (fndecls) == NULL_TREE | |
1863 | && DECL_CHAIN (TREE_VALUE (fndecls)) == NULL_TREE) | |
1864 | { | |
be99da77 | 1865 | tree access, fndecl; |
8d08fdba MS |
1866 | |
1867 | /* Unique, so use this one now. */ | |
1868 | basetype = TREE_PURPOSE (fndecls); | |
1869 | fndecl = TREE_VALUE (fndecls); | |
1870 | access = compute_access (TREE_PURPOSE (fndecls), fndecl); | |
be99da77 | 1871 | if (access == access_public_node) |
8d08fdba MS |
1872 | { |
1873 | if (DECL_VINDEX (fndecl) | |
1874 | && ! resolves_to_fixed_type_p (datum, 0)) | |
1875 | { | |
1876 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
1877 | addr = convert_pointer_to (DECL_CONTEXT (fndecl), addr); | |
1878 | datum = build_indirect_ref (addr, NULL_PTR); | |
1879 | my_friendly_assert (datum != error_mark_node, 310); | |
1880 | fndecl = build_vfn_ref (&addr, datum, DECL_VINDEX (fndecl)); | |
1881 | } | |
72b7eeff | 1882 | mark_used (fndecl); |
8d08fdba MS |
1883 | return fndecl; |
1884 | } | |
be99da77 | 1885 | if (access == access_protected_node) |
8d08fdba MS |
1886 | cp_error ("member function `%D' is protected", fndecl); |
1887 | else | |
1888 | cp_error ("member function `%D' is private", fndecl); | |
1889 | return error_mark_node; | |
1890 | } | |
1891 | else | |
e1cd6e56 MS |
1892 | { |
1893 | /* Just act like build_offset_ref, since the object does | |
1894 | not matter unless we're actually calling the function. */ | |
28cbf42c MS |
1895 | tree t; |
1896 | ||
28cbf42c | 1897 | t = build_tree_list (error_mark_node, fndecls); |
e1cd6e56 MS |
1898 | TREE_TYPE (t) = build_offset_type (basetype, |
1899 | unknown_type_node); | |
1900 | return t; | |
1901 | } | |
8d08fdba MS |
1902 | } |
1903 | ||
9e9ff709 | 1904 | cp_error ("`%#T' has no member named `%D'", basetype, component); |
8d08fdba MS |
1905 | return error_mark_node; |
1906 | } | |
1907 | else if (TREE_TYPE (field) == error_mark_node) | |
1908 | return error_mark_node; | |
1909 | ||
1910 | if (TREE_CODE (field) != FIELD_DECL) | |
1911 | { | |
1912 | if (TREE_CODE (field) == TYPE_DECL) | |
1913 | { | |
1914 | cp_error ("invalid use of type decl `%#D' as expression", field); | |
1915 | return error_mark_node; | |
1916 | } | |
72b7eeff MS |
1917 | else if (DECL_RTL (field) != 0) |
1918 | mark_used (field); | |
1919 | else | |
1920 | TREE_USED (field) = 1; | |
8d08fdba MS |
1921 | return field; |
1922 | } | |
1923 | } | |
1924 | ||
2ee887f2 MS |
1925 | /* See if we have to do any conversions so that we pick up the field from the |
1926 | right context. */ | |
9e9ff709 MS |
1927 | if (DECL_FIELD_CONTEXT (field) != basetype) |
1928 | { | |
1929 | tree context = DECL_FIELD_CONTEXT (field); | |
2ee887f2 | 1930 | tree base = context; |
fc378698 MS |
1931 | while (base != basetype && TYPE_NAME (base) |
1932 | && ANON_AGGRNAME_P (TYPE_IDENTIFIER (base))) | |
2ee887f2 MS |
1933 | { |
1934 | base = TYPE_CONTEXT (base); | |
1935 | } | |
1936 | ||
1937 | /* Handle base classes here... */ | |
1938 | if (base != basetype && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
1939 | { | |
1940 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
1941 | if (integer_zerop (addr)) | |
1942 | { | |
1943 | error ("invalid reference to NULL ptr, use ptr-to-member instead"); | |
1944 | return error_mark_node; | |
1945 | } | |
1946 | if (VBASE_NAME_P (DECL_NAME (field))) | |
1947 | { | |
1948 | /* It doesn't matter which vbase pointer we grab, just | |
1949 | find one of them. */ | |
1950 | tree binfo = get_binfo (base, | |
1951 | TREE_TYPE (TREE_TYPE (addr)), 0); | |
1952 | addr = convert_pointer_to_real (binfo, addr); | |
1953 | } | |
1954 | else | |
1955 | addr = convert_pointer_to (base, addr); | |
1956 | datum = build_indirect_ref (addr, NULL_PTR); | |
1957 | my_friendly_assert (datum != error_mark_node, 311); | |
1958 | } | |
1959 | basetype = base; | |
1960 | ||
1961 | /* Handle things from anon unions here... */ | |
fc378698 | 1962 | if (TYPE_NAME (context) && ANON_AGGRNAME_P (TYPE_IDENTIFIER (context))) |
9e9ff709 MS |
1963 | { |
1964 | tree subfield = lookup_anon_field (basetype, context); | |
1965 | tree subdatum = build_component_ref (datum, subfield, | |
1966 | basetype_path, protect); | |
1967 | return build_component_ref (subdatum, field, basetype_path, protect); | |
1968 | } | |
1969 | } | |
1970 | ||
f376e137 MS |
1971 | ref = fold (build (COMPONENT_REF, TREE_TYPE (field), |
1972 | break_out_cleanups (datum), field)); | |
8d08fdba MS |
1973 | |
1974 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1975 | TREE_READONLY (ref) = 1; | |
1976 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1977 | TREE_THIS_VOLATILE (ref) = 1; | |
1978 | if (DECL_MUTABLE_P (field)) | |
1979 | TREE_READONLY (ref) = 0; | |
1980 | ||
1981 | return ref; | |
1982 | } | |
1983 | \f | |
1984 | /* Given an expression PTR for a pointer, return an expression | |
1985 | for the value pointed to. | |
1986 | ERRORSTRING is the name of the operator to appear in error messages. | |
1987 | ||
1988 | This function may need to overload OPERATOR_FNNAME. | |
1989 | Must also handle REFERENCE_TYPEs for C++. */ | |
1990 | ||
1991 | tree | |
1992 | build_x_indirect_ref (ptr, errorstring) | |
1993 | tree ptr; | |
1994 | char *errorstring; | |
1995 | { | |
5566b478 MS |
1996 | tree rval; |
1997 | ||
1998 | if (current_template_parms) | |
1999 | return build_min_nt (INDIRECT_REF, ptr); | |
2000 | ||
2001 | rval = build_opfncall (INDIRECT_REF, LOOKUP_NORMAL, ptr, NULL_TREE, NULL_TREE); | |
8d08fdba MS |
2002 | if (rval) |
2003 | return rval; | |
2004 | return build_indirect_ref (ptr, errorstring); | |
2005 | } | |
2006 | ||
2007 | tree | |
2008 | build_indirect_ref (ptr, errorstring) | |
2009 | tree ptr; | |
2010 | char *errorstring; | |
2011 | { | |
863adfc0 MS |
2012 | register tree pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE ? |
2013 | ptr : default_conversion (ptr)); | |
8d08fdba MS |
2014 | register tree type = TREE_TYPE (pointer); |
2015 | ||
4ac14744 MS |
2016 | if (ptr == current_class_ptr) |
2017 | return current_class_ref; | |
8d08fdba | 2018 | |
f30432d7 | 2019 | if (IS_AGGR_TYPE (type)) |
28cbf42c | 2020 | { |
f30432d7 MS |
2021 | ptr = build_expr_type_conversion (WANT_POINTER, pointer, 1); |
2022 | ||
2023 | if (ptr) | |
2024 | { | |
2025 | pointer = ptr; | |
2026 | type = TREE_TYPE (pointer); | |
2027 | } | |
28cbf42c MS |
2028 | } |
2029 | ||
8d08fdba MS |
2030 | if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) |
2031 | { | |
2032 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1743ca29 RK |
2033 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (pointer, 0))) |
2034 | == TYPE_MAIN_VARIANT (TREE_TYPE (type))) | |
2035 | && (TREE_READONLY (TREE_OPERAND (pointer, 0)) | |
2036 | == TYPE_READONLY (TREE_TYPE (type))) | |
2037 | && (TREE_THIS_VOLATILE (TREE_OPERAND (pointer, 0)) | |
2038 | == TYPE_VOLATILE (TREE_TYPE (type)))) | |
8d08fdba MS |
2039 | return TREE_OPERAND (pointer, 0); |
2040 | else | |
2041 | { | |
2042 | tree t = TREE_TYPE (type); | |
2043 | register tree ref = build1 (INDIRECT_REF, | |
2044 | TYPE_MAIN_VARIANT (t), pointer); | |
2045 | ||
2046 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
2047 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); | |
2048 | TREE_SIDE_EFFECTS (ref) | |
2049 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); | |
2050 | return ref; | |
2051 | } | |
2052 | } | |
2053 | /* `pointer' won't be an error_mark_node if we were given a | |
2054 | pointer to member, so it's cool to check for this here. */ | |
2055 | else if (TYPE_PTRMEMFUNC_P (type)) | |
2056 | error ("invalid use of `%s' on pointer to member function", errorstring); | |
2057 | else if (TREE_CODE (type) == RECORD_TYPE | |
2058 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
2059 | error ("cannot dereference signature pointer/reference"); | |
2060 | else if (pointer != error_mark_node) | |
2061 | { | |
2062 | if (errorstring) | |
2063 | error ("invalid type argument of `%s'", errorstring); | |
2064 | else | |
2065 | error ("invalid type argument"); | |
2066 | } | |
2067 | return error_mark_node; | |
2068 | } | |
2069 | ||
2070 | /* This handles expressions of the form "a[i]", which denotes | |
2071 | an array reference. | |
2072 | ||
2073 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
2074 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
2075 | This avoids forcing the array out of registers, and can work on | |
2076 | arrays that are not lvalues (for example, members of structures returned | |
2077 | by functions). | |
2078 | ||
2079 | If INDEX is of some user-defined type, it must be converted to | |
2080 | integer type. Otherwise, to make a compatible PLUS_EXPR, it | |
2081 | will inherit the type of the array, which will be some pointer type. */ | |
2082 | ||
2083 | tree | |
2084 | build_x_array_ref (array, index) | |
2085 | tree array, index; | |
2086 | { | |
2087 | tree rval = build_opfncall (ARRAY_REF, LOOKUP_NORMAL, array, index, NULL_TREE); | |
2088 | if (rval) | |
2089 | return rval; | |
2090 | return build_array_ref (array, index); | |
2091 | } | |
2092 | ||
2093 | tree | |
2094 | build_array_ref (array, idx) | |
2095 | tree array, idx; | |
2096 | { | |
8d08fdba MS |
2097 | if (idx == 0) |
2098 | { | |
2099 | error ("subscript missing in array reference"); | |
2100 | return error_mark_node; | |
2101 | } | |
2102 | ||
2103 | if (TREE_TYPE (array) == error_mark_node | |
2104 | || TREE_TYPE (idx) == error_mark_node) | |
2105 | return error_mark_node; | |
2106 | ||
8d08fdba MS |
2107 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE |
2108 | && TREE_CODE (array) != INDIRECT_REF) | |
2109 | { | |
2110 | tree rval, type; | |
2111 | ||
2112 | /* Subscripting with type char is likely to lose | |
2113 | on a machine where chars are signed. | |
2114 | So warn on any machine, but optionally. | |
2115 | Don't warn for unsigned char since that type is safe. | |
2116 | Don't warn for signed char because anyone who uses that | |
2117 | must have done so deliberately. */ | |
2118 | if (warn_char_subscripts | |
2119 | && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node) | |
2120 | warning ("array subscript has type `char'"); | |
2121 | ||
2122 | /* Apply default promotions *after* noticing character types. */ | |
2123 | idx = default_conversion (idx); | |
2124 | ||
2125 | if (TREE_CODE (TREE_TYPE (idx)) != INTEGER_TYPE) | |
2126 | { | |
2127 | error ("array subscript is not an integer"); | |
2128 | return error_mark_node; | |
2129 | } | |
2130 | ||
2131 | /* An array that is indexed by a non-constant | |
2132 | cannot be stored in a register; we must be able to do | |
2133 | address arithmetic on its address. | |
2134 | Likewise an array of elements of variable size. */ | |
2135 | if (TREE_CODE (idx) != INTEGER_CST | |
2136 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
2137 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
2138 | { | |
2139 | if (mark_addressable (array) == 0) | |
2140 | return error_mark_node; | |
2141 | } | |
2142 | /* An array that is indexed by a constant value which is not within | |
2143 | the array bounds cannot be stored in a register either; because we | |
2144 | would get a crash in store_bit_field/extract_bit_field when trying | |
2145 | to access a non-existent part of the register. */ | |
2146 | if (TREE_CODE (idx) == INTEGER_CST | |
2147 | && TYPE_VALUES (TREE_TYPE (array)) | |
2148 | && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array)))) | |
2149 | { | |
2150 | if (mark_addressable (array) == 0) | |
2151 | return error_mark_node; | |
2152 | } | |
2153 | ||
8d08fdba MS |
2154 | if (pedantic && !lvalue_p (array)) |
2155 | pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); | |
2156 | ||
b7484fbe MS |
2157 | /* Note in C++ it is valid to subscript a `register' array, since |
2158 | it is valid to take the address of something with that | |
2159 | storage specification. */ | |
2160 | if (extra_warnings) | |
8d08fdba MS |
2161 | { |
2162 | tree foo = array; | |
2163 | while (TREE_CODE (foo) == COMPONENT_REF) | |
2164 | foo = TREE_OPERAND (foo, 0); | |
2165 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) | |
b7484fbe | 2166 | warning ("subscripting array declared `register'"); |
8d08fdba MS |
2167 | } |
2168 | ||
2169 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
2170 | rval = build (ARRAY_REF, type, array, idx); | |
2171 | /* Array ref is const/volatile if the array elements are | |
2172 | or if the array is.. */ | |
2173 | TREE_READONLY (rval) | |
2174 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
2175 | | TREE_READONLY (array)); | |
2176 | TREE_SIDE_EFFECTS (rval) | |
2177 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2178 | | TREE_SIDE_EFFECTS (array)); | |
2179 | TREE_THIS_VOLATILE (rval) | |
2180 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2181 | /* This was added by rms on 16 Nov 91. | |
2182 | It fixes vol struct foo *a; a->elts[1] | |
2183 | in an inline function. | |
2184 | Hope it doesn't break something else. */ | |
2185 | | TREE_THIS_VOLATILE (array)); | |
2186 | return require_complete_type (fold (rval)); | |
2187 | } | |
2188 | ||
2189 | { | |
2190 | tree ar = default_conversion (array); | |
2191 | tree ind = default_conversion (idx); | |
2192 | ||
2193 | /* Put the integer in IND to simplify error checking. */ | |
2194 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
2195 | { | |
2196 | tree temp = ar; | |
2197 | ar = ind; | |
2198 | ind = temp; | |
2199 | } | |
2200 | ||
2201 | if (ar == error_mark_node) | |
2202 | return ar; | |
2203 | ||
2204 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) | |
2205 | { | |
2206 | error ("subscripted value is neither array nor pointer"); | |
2207 | return error_mark_node; | |
2208 | } | |
2209 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
2210 | { | |
2211 | error ("array subscript is not an integer"); | |
2212 | return error_mark_node; | |
2213 | } | |
2214 | ||
2215 | return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR, ar, ind, PLUS_EXPR), | |
2216 | "array indexing"); | |
2217 | } | |
2218 | } | |
2219 | \f | |
2220 | /* Build a function call to function FUNCTION with parameters PARAMS. | |
2221 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
4ac14744 MS |
2222 | TREE_VALUE of each node is a parameter-expression. The PARAMS do |
2223 | not include any object pointer that may be required. FUNCTION's | |
2224 | data type may be a function type or a pointer-to-function. | |
8d08fdba MS |
2225 | |
2226 | For C++: If FUNCTION's data type is a TREE_LIST, then the tree list | |
2227 | is the list of possible methods that FUNCTION could conceivably | |
2228 | be. If the list of methods comes from a class, then it will be | |
2229 | a list of lists (where each element is associated with the class | |
2230 | that produced it), otherwise it will be a simple list (for | |
2231 | functions overloaded in global scope). | |
2232 | ||
2233 | In the first case, TREE_VALUE (function) is the head of one of those | |
2234 | lists, and TREE_PURPOSE is the name of the function. | |
2235 | ||
2236 | In the second case, TREE_PURPOSE (function) is the function's | |
2237 | name directly. | |
2238 | ||
4ac14744 | 2239 | DECL is the class instance variable, usually CURRENT_CLASS_REF. |
4dabb379 MS |
2240 | |
2241 | When calling a TEMPLATE_DECL, we don't require a complete return | |
2242 | type. */ | |
8d08fdba | 2243 | |
8d08fdba MS |
2244 | tree |
2245 | build_x_function_call (function, params, decl) | |
2246 | tree function, params, decl; | |
2247 | { | |
2248 | tree type; | |
2249 | int is_method; | |
2250 | ||
2251 | if (function == error_mark_node) | |
2252 | return error_mark_node; | |
2253 | ||
5566b478 | 2254 | if (current_template_parms) |
4dabb379 | 2255 | return build_min_nt (CALL_EXPR, function, params, NULL_TREE); |
5566b478 | 2256 | |
8d08fdba | 2257 | type = TREE_TYPE (function); |
fc378698 MS |
2258 | |
2259 | if (TREE_CODE (type) == OFFSET_TYPE | |
2260 | && TREE_TYPE (type) == unknown_type_node | |
2261 | && TREE_CODE (function) == TREE_LIST | |
2262 | && TREE_CHAIN (function) == NULL_TREE) | |
2263 | { | |
2264 | /* Undo (Foo:bar)()... */ | |
2265 | type = TYPE_OFFSET_BASETYPE (type); | |
2266 | function = TREE_VALUE (function); | |
2267 | my_friendly_assert (TREE_CODE (function) == TREE_LIST, 999); | |
2268 | my_friendly_assert (TREE_CHAIN (function) == NULL_TREE, 999); | |
2269 | function = TREE_VALUE (function); | |
2270 | my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 999); | |
2271 | function = DECL_NAME (function); | |
2272 | return build_method_call (decl, function, params, TYPE_BINFO (type), LOOKUP_NORMAL); | |
2273 | } | |
2274 | ||
8d08fdba MS |
2275 | is_method = ((TREE_CODE (function) == TREE_LIST |
2276 | && current_class_type != NULL_TREE | |
2277 | && IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function)) == function) | |
2278 | || TREE_CODE (function) == IDENTIFIER_NODE | |
2279 | || TREE_CODE (type) == METHOD_TYPE | |
2280 | || TYPE_PTRMEMFUNC_P (type)); | |
2281 | ||
fc378698 MS |
2282 | if (TREE_CODE (function) == FUNCTION_DECL |
2283 | && DECL_STATIC_FUNCTION_P (function)) | |
2284 | return build_member_call | |
2285 | (DECL_CONTEXT (function), DECL_NAME (function), params); | |
2286 | ||
8d08fdba MS |
2287 | /* Handle methods, friends, and overloaded functions, respectively. */ |
2288 | if (is_method) | |
2289 | { | |
2290 | if (TREE_CODE (function) == FUNCTION_DECL) | |
2291 | { | |
2292 | if (DECL_NAME (function)) | |
2293 | function = DECL_NAME (function); | |
2294 | else | |
2295 | function = TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)); | |
2296 | } | |
2297 | else if (TREE_CODE (function) == TREE_LIST) | |
2298 | { | |
8d08fdba MS |
2299 | my_friendly_assert (TREE_CODE (TREE_VALUE (function)) == FUNCTION_DECL, 312); |
2300 | function = TREE_PURPOSE (function); | |
8d08fdba MS |
2301 | } |
2302 | else if (TREE_CODE (function) != IDENTIFIER_NODE) | |
2303 | { | |
2304 | if (TREE_CODE (function) == OFFSET_REF) | |
2305 | { | |
2306 | if (TREE_OPERAND (function, 0)) | |
2307 | decl = TREE_OPERAND (function, 0); | |
2308 | } | |
2309 | /* Call via a pointer to member function. */ | |
2310 | if (decl == NULL_TREE) | |
2311 | { | |
2312 | error ("pointer to member function called, but not in class scope"); | |
2313 | return error_mark_node; | |
2314 | } | |
2315 | /* What other type of POINTER_TYPE could this be? */ | |
2316 | if (TREE_CODE (TREE_TYPE (function)) != POINTER_TYPE | |
2317 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function)) | |
2318 | && TREE_CODE (function) != OFFSET_REF) | |
2319 | function = build (OFFSET_REF, TREE_TYPE (type), NULL_TREE, function); | |
2320 | goto do_x_function; | |
2321 | } | |
2322 | ||
2323 | /* this is an abbreviated method call. | |
2324 | must go through here in case it is a virtual function. | |
2325 | @@ Perhaps this could be optimized. */ | |
2326 | ||
2327 | if (decl == NULL_TREE) | |
2328 | { | |
2329 | if (current_class_type == NULL_TREE) | |
2330 | { | |
2331 | error ("object missing in call to method `%s'", | |
2332 | IDENTIFIER_POINTER (function)); | |
2333 | return error_mark_node; | |
2334 | } | |
2335 | /* Yow: call from a static member function. */ | |
f30432d7 | 2336 | decl = build1 (NOP_EXPR, build_pointer_type (current_class_type), |
8d08fdba MS |
2337 | error_mark_node); |
2338 | decl = build_indirect_ref (decl, NULL_PTR); | |
2339 | } | |
2340 | ||
2341 | return build_method_call (decl, function, params, | |
2342 | NULL_TREE, LOOKUP_NORMAL); | |
2343 | } | |
2344 | else if (TREE_CODE (function) == COMPONENT_REF | |
2345 | && type == unknown_type_node) | |
2346 | { | |
2347 | /* Should we undo what was done in build_component_ref? */ | |
2348 | if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function, 1))) == TREE_VEC) | |
2349 | /* Get the name that build_component_ref hid. */ | |
2350 | function = DECL_NAME (TREE_VALUE (TREE_OPERAND (function, 1))); | |
2351 | else | |
2352 | function = TREE_PURPOSE (TREE_OPERAND (function, 1)); | |
2353 | return build_method_call (decl, function, params, | |
2354 | NULL_TREE, LOOKUP_NORMAL); | |
2355 | } | |
2356 | else if (TREE_CODE (function) == TREE_LIST) | |
2357 | { | |
2358 | if (TREE_VALUE (function) == NULL_TREE) | |
2359 | { | |
2360 | cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?", | |
2361 | TREE_PURPOSE (function)); | |
2362 | return error_mark_node; | |
2363 | } | |
2364 | else | |
2365 | { | |
5b605f68 | 2366 | tree val = TREE_VALUE (function); |
8d08fdba | 2367 | |
5b605f68 | 2368 | if (TREE_CODE (val) == TEMPLATE_DECL) |
4dabb379 MS |
2369 | return build_overload_call_real |
2370 | (function, params, LOOKUP_COMPLAIN, (struct candidate *)0, 0); | |
5b605f68 | 2371 | else if (DECL_CHAIN (val) != NULL_TREE) |
8d08fdba | 2372 | return build_overload_call |
5b605f68 MS |
2373 | (function, params, LOOKUP_COMPLAIN, (struct candidate *)0); |
2374 | else | |
2375 | my_friendly_abort (360); | |
8d08fdba MS |
2376 | } |
2377 | } | |
2378 | ||
2379 | do_x_function: | |
2380 | if (TREE_CODE (function) == OFFSET_REF) | |
2381 | { | |
2382 | /* If the component is a data element (or a virtual function), we play | |
2383 | games here to make things work. */ | |
2384 | tree decl_addr; | |
2385 | ||
2386 | if (TREE_OPERAND (function, 0)) | |
2387 | decl = TREE_OPERAND (function, 0); | |
2388 | else | |
4ac14744 | 2389 | decl = current_class_ref; |
8d08fdba MS |
2390 | |
2391 | decl_addr = build_unary_op (ADDR_EXPR, decl, 0); | |
b7484fbe | 2392 | function = get_member_function_from_ptrfunc (&decl_addr, |
8d08fdba MS |
2393 | TREE_OPERAND (function, 1)); |
2394 | params = tree_cons (NULL_TREE, decl_addr, params); | |
2395 | return build_function_call (function, params); | |
2396 | } | |
2397 | ||
2398 | type = TREE_TYPE (function); | |
2399 | if (type != error_mark_node) | |
2400 | { | |
2401 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
2402 | type = TREE_TYPE (type); | |
2403 | ||
e76a2646 MS |
2404 | if (TYPE_LANG_SPECIFIC (type) |
2405 | && TYPE_OVERLOADS_CALL_EXPR (complete_type (type))) | |
8d08fdba MS |
2406 | return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, function, params, NULL_TREE); |
2407 | } | |
2408 | ||
2409 | if (is_method) | |
2410 | { | |
2411 | tree fntype = TREE_TYPE (function); | |
2412 | tree ctypeptr; | |
2413 | ||
2414 | /* Explicitly named method? */ | |
2415 | if (TREE_CODE (function) == FUNCTION_DECL) | |
f30432d7 | 2416 | ctypeptr = build_pointer_type (DECL_CLASS_CONTEXT (function)); |
8d08fdba MS |
2417 | /* Expression with ptr-to-method type? It could either be a plain |
2418 | usage, or it might be a case where the ptr-to-method is being | |
2419 | passed in as an argument. */ | |
2420 | else if (TYPE_PTRMEMFUNC_P (fntype)) | |
2421 | { | |
2422 | tree rec = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (fntype))); | |
f30432d7 | 2423 | ctypeptr = build_pointer_type (rec); |
8d08fdba MS |
2424 | } |
2425 | /* Unexpected node type? */ | |
2426 | else | |
2427 | my_friendly_abort (116); | |
2428 | if (decl == NULL_TREE) | |
2429 | { | |
2430 | if (current_function_decl | |
2431 | && DECL_STATIC_FUNCTION_P (current_function_decl)) | |
2432 | error ("invalid call to member function needing `this' in static member function scope"); | |
2433 | else | |
2434 | error ("pointer to member function called, but not in class scope"); | |
2435 | return error_mark_node; | |
2436 | } | |
2437 | if (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE | |
2438 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl))) | |
2439 | { | |
2440 | decl = build_unary_op (ADDR_EXPR, decl, 0); | |
2441 | decl = convert_pointer_to (TREE_TYPE (ctypeptr), decl); | |
2442 | } | |
2443 | else | |
6060a796 | 2444 | decl = build_c_cast (ctypeptr, decl, 0); |
8d08fdba MS |
2445 | params = tree_cons (NULL_TREE, decl, params); |
2446 | } | |
2447 | ||
2448 | return build_function_call (function, params); | |
2449 | } | |
2450 | ||
2451 | /* Resolve a pointer to member function. INSTANCE is the object | |
2452 | instance to use, if the member points to a virtual member. */ | |
2453 | ||
2454 | tree | |
b7484fbe | 2455 | get_member_function_from_ptrfunc (instance_ptrptr, function) |
8d08fdba | 2456 | tree *instance_ptrptr; |
8d08fdba MS |
2457 | tree function; |
2458 | { | |
2459 | if (TREE_CODE (function) == OFFSET_REF) | |
2460 | { | |
2461 | function = TREE_OPERAND (function, 1); | |
2462 | } | |
2463 | ||
2464 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) | |
2465 | { | |
f30432d7 | 2466 | tree fntype, index, e1, delta, delta2, e2, e3, aref, vtbl; |
b7484fbe | 2467 | tree instance; |
f30432d7 | 2468 | |
b7484fbe MS |
2469 | tree instance_ptr = *instance_ptrptr; |
2470 | ||
2471 | if (TREE_SIDE_EFFECTS (instance_ptr)) | |
2472 | instance_ptr = save_expr (instance_ptr); | |
2473 | ||
f30432d7 MS |
2474 | if (TREE_SIDE_EFFECTS (function)) |
2475 | function = save_expr (function); | |
2476 | ||
2477 | fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); | |
2478 | index = save_expr (build_component_ref (function, | |
2479 | index_identifier, | |
4dabb379 | 2480 | NULL_TREE, 0)); |
f30432d7 MS |
2481 | e1 = build (GT_EXPR, boolean_type_node, index, |
2482 | convert (delta_type_node, integer_zero_node)); | |
2483 | delta = convert (ptrdiff_type_node, | |
4dabb379 | 2484 | build_component_ref (function, delta_identifier, NULL_TREE, 0)); |
f30432d7 MS |
2485 | delta2 = DELTA2_FROM_PTRMEMFUNC (function); |
2486 | ||
51c184be | 2487 | /* convert down to the right base, before using the instance. */ |
b7484fbe MS |
2488 | instance |
2489 | = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)), | |
2490 | instance_ptr); | |
51c184be MS |
2491 | if (instance == error_mark_node) |
2492 | return instance; | |
2493 | ||
2494 | vtbl = convert_pointer_to (ptr_type_node, instance); | |
700f8a87 MS |
2495 | vtbl |
2496 | = build (PLUS_EXPR, | |
2497 | build_pointer_type (build_pointer_type (vtable_entry_type)), | |
e1cd6e56 | 2498 | vtbl, convert (ptrdiff_type_node, delta2)); |
8d08fdba | 2499 | vtbl = build_indirect_ref (vtbl, NULL_PTR); |
e1cd6e56 MS |
2500 | aref = build_array_ref (vtbl, build_binary_op (MINUS_EXPR, |
2501 | index, | |
2502 | integer_one_node, 1)); | |
700f8a87 MS |
2503 | if (! flag_vtable_thunks) |
2504 | { | |
2505 | aref = save_expr (aref); | |
8d08fdba | 2506 | |
e1cd6e56 | 2507 | delta = build_binary_op (PLUS_EXPR, |
4dabb379 | 2508 | build_conditional_expr (e1, build_component_ref (aref, delta_identifier, NULL_TREE, 0), integer_zero_node), |
e1cd6e56 | 2509 | delta, 1); |
700f8a87 | 2510 | } |
8d08fdba | 2511 | |
b7484fbe MS |
2512 | *instance_ptrptr = build (PLUS_EXPR, TREE_TYPE (instance_ptr), |
2513 | instance_ptr, delta); | |
700f8a87 MS |
2514 | if (flag_vtable_thunks) |
2515 | e2 = aref; | |
2516 | else | |
4dabb379 | 2517 | e2 = build_component_ref (aref, pfn_identifier, NULL_TREE, 0); |
8d08fdba MS |
2518 | |
2519 | e3 = PFN_FROM_PTRMEMFUNC (function); | |
2520 | TREE_TYPE (e2) = TREE_TYPE (e3); | |
2521 | function = build_conditional_expr (e1, e2, e3); | |
b7484fbe MS |
2522 | |
2523 | /* Make sure this doesn't get evaluated first inside one of the | |
2524 | branches of the COND_EXPR. */ | |
2525 | if (TREE_CODE (instance_ptr) == SAVE_EXPR) | |
2526 | function = build (COMPOUND_EXPR, TREE_TYPE (function), | |
2527 | instance_ptr, function); | |
8d08fdba MS |
2528 | } |
2529 | return function; | |
2530 | } | |
2531 | ||
2532 | tree | |
2533 | build_function_call_real (function, params, require_complete, flags) | |
2534 | tree function, params; | |
2535 | int require_complete, flags; | |
2536 | { | |
2537 | register tree fntype, fndecl; | |
2538 | register tree value_type; | |
2539 | register tree coerced_params; | |
2540 | tree name = NULL_TREE, assembler_name = NULL_TREE; | |
2541 | int is_method; | |
2542 | ||
2543 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
2544 | Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ | |
2545 | if (TREE_CODE (function) == NOP_EXPR | |
2546 | && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) | |
2547 | function = TREE_OPERAND (function, 0); | |
2548 | ||
2549 | if (TREE_CODE (function) == FUNCTION_DECL) | |
2550 | { | |
2551 | name = DECL_NAME (function); | |
2552 | assembler_name = DECL_ASSEMBLER_NAME (function); | |
2553 | ||
2554 | GNU_xref_call (current_function_decl, | |
2555 | IDENTIFIER_POINTER (name ? name | |
2556 | : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)))); | |
72b7eeff | 2557 | mark_used (function); |
8d08fdba MS |
2558 | fndecl = function; |
2559 | ||
2560 | /* Convert anything with function type to a pointer-to-function. */ | |
2561 | if (pedantic | |
2562 | && name | |
2563 | && IDENTIFIER_LENGTH (name) == 4 | |
2564 | && ! strcmp (IDENTIFIER_POINTER (name), "main") | |
2565 | && DECL_CONTEXT (function) == NULL_TREE) | |
2566 | { | |
2567 | pedwarn ("ANSI C++ forbids calling `main' from within program"); | |
2568 | } | |
2569 | ||
a5894242 MS |
2570 | if (pedantic && DECL_THIS_INLINE (function) && ! DECL_INITIAL (function) |
2571 | && ! DECL_ARTIFICIAL (function) | |
2572 | && ! DECL_PENDING_INLINE_INFO (function)) | |
2573 | cp_pedwarn ("inline function `%#D' called before definition", | |
2574 | function); | |
2575 | ||
8d08fdba MS |
2576 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
2577 | (because calling an inline function does not mean the function | |
2578 | needs to be separately compiled). */ | |
2579 | ||
2580 | if (DECL_INLINE (function)) | |
2581 | { | |
fd378c9d | 2582 | /* Is it a synthesized method that needs to be synthesized? */ |
72b7eeff | 2583 | if (DECL_ARTIFICIAL (function) && ! DECL_INITIAL (function) |
fd378c9d JM |
2584 | /* Kludge: don't synthesize for default args. */ |
2585 | && current_function_decl) | |
2586 | synthesize_method (function); | |
2587 | ||
6b5fbb55 | 2588 | function = inline_conversion (function); |
8d08fdba MS |
2589 | } |
2590 | else | |
4ac14744 | 2591 | function = build_addr_func (function); |
8d08fdba MS |
2592 | } |
2593 | else | |
2594 | { | |
2595 | fndecl = NULL_TREE; | |
2596 | ||
4ac14744 | 2597 | function = build_addr_func (function); |
8d08fdba MS |
2598 | } |
2599 | ||
4ac14744 MS |
2600 | if (function == error_mark_node) |
2601 | return error_mark_node; | |
2602 | ||
8d08fdba MS |
2603 | fntype = TREE_TYPE (function); |
2604 | ||
2605 | if (TYPE_PTRMEMFUNC_P (fntype)) | |
2606 | { | |
4ac14744 MS |
2607 | cp_error ("must use .* or ->* to call pointer-to-member function in `%E (...)'", |
2608 | function); | |
2609 | return error_mark_node; | |
8d08fdba MS |
2610 | } |
2611 | ||
2612 | is_method = (TREE_CODE (fntype) == POINTER_TYPE | |
2613 | && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); | |
2614 | ||
2615 | if (!((TREE_CODE (fntype) == POINTER_TYPE | |
2616 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) | |
2617 | || is_method)) | |
2618 | { | |
a5894242 | 2619 | cp_error ("`%E' cannot be used as a function", function); |
8d08fdba MS |
2620 | return error_mark_node; |
2621 | } | |
2622 | ||
2623 | /* fntype now gets the type of function pointed to. */ | |
2624 | fntype = TREE_TYPE (fntype); | |
2625 | ||
2626 | /* Convert the parameters to the types declared in the | |
2627 | function prototype, or apply default promotions. */ | |
2628 | ||
2629 | if (flags & LOOKUP_COMPLAIN) | |
2630 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2631 | params, fndecl, LOOKUP_NORMAL); | |
2632 | else | |
2633 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2634 | params, fndecl, 0); | |
2635 | ||
863adfc0 | 2636 | if (coerced_params == error_mark_node) |
878cd289 MS |
2637 | if (flags & LOOKUP_SPECULATIVELY) |
2638 | return NULL_TREE; | |
2639 | else | |
2640 | return error_mark_node; | |
863adfc0 | 2641 | |
8d08fdba MS |
2642 | /* Check for errors in format strings. */ |
2643 | ||
2644 | if (warn_format && (name || assembler_name)) | |
2645 | check_function_format (name, assembler_name, coerced_params); | |
2646 | ||
2647 | /* Recognize certain built-in functions so we can make tree-codes | |
2648 | other than CALL_EXPR. We do this when it enables fold-const.c | |
2649 | to do something useful. */ | |
2650 | ||
2651 | if (TREE_CODE (function) == ADDR_EXPR | |
2652 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
2653 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
2654 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
2655 | { | |
2656 | case BUILT_IN_ABS: | |
2657 | case BUILT_IN_LABS: | |
2658 | case BUILT_IN_FABS: | |
2659 | if (coerced_params == 0) | |
2660 | return integer_zero_node; | |
2661 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
2662 | } | |
2663 | ||
2664 | /* C++ */ | |
2665 | value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node; | |
2666 | { | |
4ac14744 MS |
2667 | register tree result |
2668 | = build_call (function, value_type, coerced_params); | |
8ccc31eb | 2669 | |
4ac14744 MS |
2670 | if (require_complete) |
2671 | { | |
2672 | if (value_type == void_type_node) | |
2673 | return result; | |
2674 | result = require_complete_type (result); | |
2675 | } | |
8ccc31eb | 2676 | return convert_from_reference (result); |
8d08fdba MS |
2677 | } |
2678 | } | |
2679 | ||
2680 | tree | |
2681 | build_function_call (function, params) | |
2682 | tree function, params; | |
2683 | { | |
39211cd5 | 2684 | return build_function_call_real (function, params, 1, LOOKUP_NORMAL); |
8d08fdba | 2685 | } |
8d08fdba MS |
2686 | \f |
2687 | /* Convert the actual parameter expressions in the list VALUES | |
2688 | to the types in the list TYPELIST. | |
2689 | If parmdecls is exhausted, or when an element has NULL as its type, | |
2690 | perform the default conversions. | |
2691 | ||
2692 | RETURN_LOC is the location of the return value, if known, NULL_TREE | |
2693 | otherwise. This is useful in the case where we can avoid creating | |
2694 | a temporary variable in the case where we can initialize the return | |
2695 | value directly. If we are not eliding constructors, then we set this | |
2696 | to NULL_TREE to avoid this avoidance. | |
2697 | ||
2698 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
2699 | ||
2700 | This is also where warnings about wrong number of args are generated. | |
2701 | ||
2702 | Return a list of expressions for the parameters as converted. | |
2703 | ||
2704 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
2705 | with the elements of the list in the TREE_VALUE slots of those nodes. | |
2706 | ||
2707 | In C++, unspecified trailing parameters can be filled in with their | |
2708 | default arguments, if such were specified. Do so here. */ | |
2709 | ||
2710 | tree | |
2711 | convert_arguments (return_loc, typelist, values, fndecl, flags) | |
2712 | tree return_loc, typelist, values, fndecl; | |
2713 | int flags; | |
2714 | { | |
8d08fdba MS |
2715 | register tree typetail, valtail; |
2716 | register tree result = NULL_TREE; | |
2717 | char *called_thing; | |
8d08fdba MS |
2718 | int i = 0; |
2719 | ||
2720 | if (! flag_elide_constructors) | |
2721 | return_loc = 0; | |
2722 | ||
2723 | if (fndecl) | |
2724 | { | |
2725 | if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) | |
2726 | { | |
2727 | if (DECL_NAME (fndecl) == NULL_TREE | |
2728 | || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) | |
2729 | called_thing = "constructor"; | |
2730 | else | |
2731 | called_thing = "member function"; | |
8d08fdba MS |
2732 | } |
2733 | else | |
a0a33927 | 2734 | called_thing = "function"; |
8d08fdba MS |
2735 | } |
2736 | ||
2737 | for (valtail = values, typetail = typelist; | |
2738 | valtail; | |
2739 | valtail = TREE_CHAIN (valtail), i++) | |
2740 | { | |
2741 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
2742 | register tree val = TREE_VALUE (valtail); | |
2743 | ||
8ccc31eb | 2744 | if (val == error_mark_node) |
863adfc0 | 2745 | return error_mark_node; |
8ccc31eb | 2746 | |
8d08fdba MS |
2747 | if (type == void_type_node) |
2748 | { | |
2749 | if (fndecl) | |
2750 | { | |
fc378698 MS |
2751 | cp_error_at ("too many arguments to %s `%+D'", called_thing, |
2752 | fndecl); | |
8d08fdba MS |
2753 | error ("at this point in file"); |
2754 | } | |
2755 | else | |
2756 | error ("too many arguments to function"); | |
2757 | /* In case anybody wants to know if this argument | |
2758 | list is valid. */ | |
2759 | if (result) | |
2760 | TREE_TYPE (tree_last (result)) = error_mark_node; | |
2761 | break; | |
2762 | } | |
2763 | ||
2764 | /* The tree type of the parameter being passed may not yet be | |
2765 | known. In this case, its type is TYPE_UNKNOWN, and will | |
2766 | be instantiated by the type given by TYPE. If TYPE | |
2767 | is also NULL, the tree type of VAL is ERROR_MARK_NODE. */ | |
2768 | if (type && type_unknown_p (val)) | |
2769 | val = require_instantiated_type (type, val, integer_zero_node); | |
2770 | else if (type_unknown_p (val)) | |
2771 | { | |
2772 | /* Strip the `&' from an overloaded FUNCTION_DECL. */ | |
2773 | if (TREE_CODE (val) == ADDR_EXPR) | |
2774 | val = TREE_OPERAND (val, 0); | |
2775 | if (TREE_CODE (val) == TREE_LIST | |
2776 | && TREE_CHAIN (val) == NULL_TREE | |
2777 | && TREE_TYPE (TREE_VALUE (val)) != NULL_TREE | |
2778 | && (TREE_TYPE (val) == unknown_type_node | |
2779 | || DECL_CHAIN (TREE_VALUE (val)) == NULL_TREE)) | |
2780 | /* Instantiates automatically. */ | |
2781 | val = TREE_VALUE (val); | |
2782 | else | |
2783 | { | |
2784 | error ("insufficient type information in parameter list"); | |
2785 | val = integer_zero_node; | |
2786 | } | |
2787 | } | |
51c184be MS |
2788 | else if (TREE_CODE (val) == OFFSET_REF |
2789 | && TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) | |
2790 | { | |
2791 | /* This is unclean. Should be handled elsewhere. */ | |
2792 | val = build_unary_op (ADDR_EXPR, val, 0); | |
2793 | } | |
8d08fdba MS |
2794 | else if (TREE_CODE (val) == OFFSET_REF) |
2795 | val = resolve_offset_ref (val); | |
2796 | ||
8d08fdba MS |
2797 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
2798 | Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ | |
2799 | if (TREE_CODE (val) == NOP_EXPR | |
a0a33927 MS |
2800 | && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) |
2801 | && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) | |
8d08fdba MS |
2802 | val = TREE_OPERAND (val, 0); |
2803 | ||
00595019 MS |
2804 | if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE) |
2805 | { | |
2806 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
8d08fdba | 2807 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE |
00595019 MS |
2808 | || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) |
2809 | val = default_conversion (val); | |
8d08fdba | 2810 | |
00595019 MS |
2811 | val = require_complete_type (val); |
2812 | } | |
8d08fdba MS |
2813 | |
2814 | if (val == error_mark_node) | |
863adfc0 | 2815 | return error_mark_node; |
8d08fdba | 2816 | |
8d08fdba MS |
2817 | if (type != 0) |
2818 | { | |
2819 | /* Formal parm type is specified by a function prototype. */ | |
2820 | tree parmval; | |
2821 | ||
e76a2646 | 2822 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba MS |
2823 | { |
2824 | error ("parameter type of called function is incomplete"); | |
2825 | parmval = val; | |
2826 | } | |
2827 | else | |
2828 | { | |
72b7eeff MS |
2829 | parmval = convert_for_initialization (return_loc, type, val, |
2830 | flags|INDIRECT_BIND, | |
8d08fdba MS |
2831 | "argument passing", fndecl, i); |
2832 | #ifdef PROMOTE_PROTOTYPES | |
2833 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2834 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2835 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2836 | parmval = default_conversion (parmval); | |
2837 | #endif | |
2838 | } | |
878cd289 MS |
2839 | |
2840 | if (parmval == error_mark_node) | |
2841 | return error_mark_node; | |
2842 | ||
8d08fdba MS |
2843 | result = tree_cons (NULL_TREE, parmval, result); |
2844 | } | |
2845 | else | |
2846 | { | |
2847 | if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE) | |
2848 | val = convert_from_reference (val); | |
2849 | ||
2850 | if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2851 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2852 | < TYPE_PRECISION (double_type_node))) | |
2853 | /* Convert `float' to `double'. */ | |
2854 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
2855 | else if (TYPE_LANG_SPECIFIC (TREE_TYPE (val)) | |
e8abc66f | 2856 | && ! TYPE_HAS_TRIVIAL_INIT_REF (TREE_TYPE (val))) |
8d08fdba MS |
2857 | { |
2858 | cp_warning ("cannot pass objects of type `%T' through `...'", | |
2859 | TREE_TYPE (val)); | |
2860 | result = tree_cons (NULL_TREE, val, result); | |
2861 | } | |
2862 | else | |
2863 | /* Convert `short' and `char' to full-size `int'. */ | |
2864 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
2865 | } | |
2866 | ||
8d08fdba MS |
2867 | if (typetail) |
2868 | typetail = TREE_CHAIN (typetail); | |
2869 | } | |
2870 | ||
2871 | if (typetail != 0 && typetail != void_list_node) | |
2872 | { | |
2873 | /* See if there are default arguments that can be used */ | |
2874 | if (TREE_PURPOSE (typetail)) | |
2875 | { | |
f376e137 | 2876 | for (; typetail != void_list_node; ++i) |
8d08fdba MS |
2877 | { |
2878 | tree type = TREE_VALUE (typetail); | |
878cd289 | 2879 | tree val = break_out_target_exprs (TREE_PURPOSE (typetail)); |
8d08fdba MS |
2880 | tree parmval; |
2881 | ||
2882 | if (val == NULL_TREE) | |
2883 | parmval = error_mark_node; | |
2884 | else if (TREE_CODE (val) == CONSTRUCTOR) | |
2885 | { | |
2886 | parmval = digest_init (type, val, (tree *)0); | |
2887 | parmval = convert_for_initialization (return_loc, type, parmval, flags, | |
2888 | "default constructor", fndecl, i); | |
2889 | } | |
2890 | else | |
2891 | { | |
2892 | /* This could get clobbered by the following call. */ | |
2893 | if (TREE_HAS_CONSTRUCTOR (val)) | |
2894 | val = copy_node (val); | |
2895 | ||
2896 | parmval = convert_for_initialization (return_loc, type, val, flags, | |
2897 | "default argument", fndecl, i); | |
2898 | #ifdef PROMOTE_PROTOTYPES | |
2899 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2900 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2901 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2902 | parmval = default_conversion (parmval); | |
2903 | #endif | |
2904 | } | |
8d08fdba | 2905 | |
878cd289 MS |
2906 | if (parmval == error_mark_node) |
2907 | return error_mark_node; | |
2908 | ||
8d08fdba MS |
2909 | result = tree_cons (0, parmval, result); |
2910 | typetail = TREE_CHAIN (typetail); | |
2911 | /* ends with `...'. */ | |
2912 | if (typetail == NULL_TREE) | |
2913 | break; | |
2914 | } | |
2915 | } | |
2916 | else | |
2917 | { | |
2918 | if (fndecl) | |
2919 | { | |
2920 | char *buf = (char *)alloca (32 + strlen (called_thing)); | |
2921 | sprintf (buf, "too few arguments to %s `%%#D'", called_thing); | |
2922 | cp_error_at (buf, fndecl); | |
2923 | error ("at this point in file"); | |
2924 | } | |
2925 | else | |
2926 | error ("too few arguments to function"); | |
2927 | return error_mark_list; | |
2928 | } | |
2929 | } | |
8d08fdba MS |
2930 | |
2931 | return nreverse (result); | |
2932 | } | |
2933 | \f | |
2934 | /* Build a binary-operation expression, after performing default | |
2935 | conversions on the operands. CODE is the kind of expression to build. */ | |
2936 | ||
2937 | tree | |
2938 | build_x_binary_op (code, arg1, arg2) | |
2939 | enum tree_code code; | |
2940 | tree arg1, arg2; | |
2941 | { | |
5566b478 MS |
2942 | tree rval; |
2943 | ||
2944 | if (current_template_parms) | |
2945 | return build_min_nt (code, arg1, arg2); | |
2946 | ||
2947 | rval = build_opfncall (code, LOOKUP_SPECULATIVELY, | |
2948 | arg1, arg2, NULL_TREE); | |
8d08fdba MS |
2949 | if (rval) |
2950 | return build_opfncall (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); | |
2951 | if (code == MEMBER_REF) | |
2952 | return build_m_component_ref (build_indirect_ref (arg1, NULL_PTR), | |
2953 | arg2); | |
2954 | return build_binary_op (code, arg1, arg2, 1); | |
2955 | } | |
2956 | ||
2957 | tree | |
2958 | build_binary_op (code, arg1, arg2, convert_p) | |
2959 | enum tree_code code; | |
2960 | tree arg1, arg2; | |
2961 | int convert_p; | |
2962 | { | |
8d08fdba MS |
2963 | tree args[2]; |
2964 | ||
2965 | args[0] = arg1; | |
2966 | args[1] = arg2; | |
2967 | ||
2968 | if (convert_p) | |
2969 | { | |
b7484fbe | 2970 | tree type0, type1; |
a9aedbc2 MS |
2971 | args[0] = decay_conversion (args[0]); |
2972 | args[1] = decay_conversion (args[1]); | |
8d08fdba | 2973 | |
b7484fbe MS |
2974 | if (args[0] == error_mark_node || args[1] == error_mark_node) |
2975 | return error_mark_node; | |
2976 | ||
2977 | type0 = TREE_TYPE (args[0]); | |
2978 | type1 = TREE_TYPE (args[1]); | |
2979 | ||
8d08fdba MS |
2980 | if (type_unknown_p (args[0])) |
2981 | { | |
b7484fbe | 2982 | args[0] = instantiate_type (type1, args[0], 1); |
a9aedbc2 | 2983 | args[0] = decay_conversion (args[0]); |
8d08fdba MS |
2984 | } |
2985 | else if (type_unknown_p (args[1])) | |
2986 | { | |
b7484fbe | 2987 | args[1] = require_instantiated_type (type0, args[1], |
8d08fdba | 2988 | error_mark_node); |
a9aedbc2 | 2989 | args[1] = decay_conversion (args[1]); |
8d08fdba MS |
2990 | } |
2991 | ||
b7484fbe | 2992 | if (IS_AGGR_TYPE (type0) || IS_AGGR_TYPE (type1)) |
8d08fdba MS |
2993 | { |
2994 | /* Try to convert this to something reasonable. */ | |
2995 | if (! build_default_binary_type_conversion(code, &args[0], &args[1])) | |
8d08fdba MS |
2996 | { |
2997 | cp_error ("no match for `%O(%#T, %#T)'", code, | |
21474714 | 2998 | TREE_TYPE (arg1), TREE_TYPE (arg2)); |
8d08fdba MS |
2999 | return error_mark_node; |
3000 | } | |
8d08fdba MS |
3001 | } |
3002 | } | |
3003 | return build_binary_op_nodefault (code, args[0], args[1], code); | |
3004 | } | |
3005 | ||
3006 | /* Build a binary-operation expression without default conversions. | |
3007 | CODE is the kind of expression to build. | |
3008 | This function differs from `build' in several ways: | |
3009 | the data type of the result is computed and recorded in it, | |
3010 | warnings are generated if arg data types are invalid, | |
3011 | special handling for addition and subtraction of pointers is known, | |
3012 | and some optimization is done (operations on narrow ints | |
3013 | are done in the narrower type when that gives the same result). | |
3014 | Constant folding is also done before the result is returned. | |
3015 | ||
3016 | ERROR_CODE is the code that determines what to say in error messages. | |
3017 | It is usually, but not always, the same as CODE. | |
3018 | ||
3019 | Note that the operands will never have enumeral types | |
3020 | because either they have just had the default conversions performed | |
3021 | or they have both just been converted to some other type in which | |
3022 | the arithmetic is to be done. | |
3023 | ||
3024 | C++: must do special pointer arithmetic when implementing | |
3025 | multiple inheritance, and deal with pointer to member functions. */ | |
3026 | ||
3027 | tree | |
39211cd5 | 3028 | build_binary_op_nodefault (code, orig_op0, orig_op1, error_code) |
8d08fdba | 3029 | enum tree_code code; |
39211cd5 | 3030 | tree orig_op0, orig_op1; |
8d08fdba MS |
3031 | enum tree_code error_code; |
3032 | { | |
39211cd5 MS |
3033 | tree op0, op1; |
3034 | register enum tree_code code0, code1; | |
3035 | tree type0, type1; | |
8d08fdba MS |
3036 | |
3037 | /* Expression code to give to the expression when it is built. | |
3038 | Normally this is CODE, which is what the caller asked for, | |
3039 | but in some special cases we change it. */ | |
3040 | register enum tree_code resultcode = code; | |
3041 | ||
3042 | /* Data type in which the computation is to be performed. | |
3043 | In the simplest cases this is the common type of the arguments. */ | |
3044 | register tree result_type = NULL; | |
3045 | ||
3046 | /* Nonzero means operands have already been type-converted | |
3047 | in whatever way is necessary. | |
3048 | Zero means they need to be converted to RESULT_TYPE. */ | |
3049 | int converted = 0; | |
3050 | ||
28cbf42c MS |
3051 | /* Nonzero means create the expression with this type, rather than |
3052 | RESULT_TYPE. */ | |
3053 | tree build_type = 0; | |
3054 | ||
8d08fdba | 3055 | /* Nonzero means after finally constructing the expression |
faae18ab | 3056 | convert it to this type. */ |
8d08fdba MS |
3057 | tree final_type = 0; |
3058 | ||
3059 | /* Nonzero if this is an operation like MIN or MAX which can | |
3060 | safely be computed in short if both args are promoted shorts. | |
3061 | Also implies COMMON. | |
3062 | -1 indicates a bitwise operation; this makes a difference | |
3063 | in the exact conditions for when it is safe to do the operation | |
3064 | in a narrower mode. */ | |
3065 | int shorten = 0; | |
3066 | ||
3067 | /* Nonzero if this is a comparison operation; | |
3068 | if both args are promoted shorts, compare the original shorts. | |
3069 | Also implies COMMON. */ | |
3070 | int short_compare = 0; | |
3071 | ||
3072 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
3073 | original short and then promoted if the operand is a promoted short. */ | |
3074 | int short_shift = 0; | |
3075 | ||
3076 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
3077 | int common = 0; | |
3078 | ||
39211cd5 | 3079 | /* Apply default conversions. */ |
a9aedbc2 MS |
3080 | if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR |
3081 | || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR | |
3082 | || code == TRUTH_XOR_EXPR) | |
3083 | { | |
3084 | op0 = decay_conversion (orig_op0); | |
3085 | op1 = decay_conversion (orig_op1); | |
3086 | } | |
3087 | else | |
3088 | { | |
3089 | op0 = default_conversion (orig_op0); | |
3090 | op1 = default_conversion (orig_op1); | |
3091 | } | |
39211cd5 MS |
3092 | |
3093 | type0 = TREE_TYPE (op0); | |
3094 | type1 = TREE_TYPE (op1); | |
3095 | ||
3096 | /* The expression codes of the data types of the arguments tell us | |
3097 | whether the arguments are integers, floating, pointers, etc. */ | |
3098 | code0 = TREE_CODE (type0); | |
3099 | code1 = TREE_CODE (type1); | |
3100 | ||
8d08fdba MS |
3101 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
3102 | STRIP_TYPE_NOPS (op0); | |
3103 | STRIP_TYPE_NOPS (op1); | |
3104 | ||
3105 | /* If an error was already reported for one of the arguments, | |
3106 | avoid reporting another error. */ | |
3107 | ||
3108 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
3109 | return error_mark_node; | |
3110 | ||
3111 | switch (code) | |
3112 | { | |
3113 | case PLUS_EXPR: | |
3114 | /* Handle the pointer + int case. */ | |
3115 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3116 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
3117 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
3118 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
3119 | else | |
3120 | common = 1; | |
3121 | break; | |
3122 | ||
3123 | case MINUS_EXPR: | |
3124 | /* Subtraction of two similar pointers. | |
3125 | We must subtract them as integers, then divide by object size. */ | |
3126 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
3127 | && comp_target_types (type0, type1, 1)) | |
3128 | return pointer_diff (op0, op1); | |
3129 | /* Handle pointer minus int. Just like pointer plus int. */ | |
3130 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3131 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
3132 | else | |
3133 | common = 1; | |
3134 | break; | |
3135 | ||
3136 | case MULT_EXPR: | |
3137 | common = 1; | |
3138 | break; | |
3139 | ||
3140 | case TRUNC_DIV_EXPR: | |
3141 | case CEIL_DIV_EXPR: | |
3142 | case FLOOR_DIV_EXPR: | |
3143 | case ROUND_DIV_EXPR: | |
3144 | case EXACT_DIV_EXPR: | |
3145 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3146 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3147 | { | |
a0a33927 | 3148 | if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) |
5b605f68 | 3149 | cp_warning ("division by zero in `%E / 0'", op0); |
a0a33927 | 3150 | else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1)) |
5b605f68 | 3151 | cp_warning ("division by zero in `%E / 0.'", op0); |
a0a33927 | 3152 | |
8d08fdba MS |
3153 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) |
3154 | resultcode = RDIV_EXPR; | |
3155 | else | |
3156 | /* When dividing two signed integers, we have to promote to int. | |
ddd5a7c1 | 3157 | unless we divide by a constant != -1. Note that default |
8d08fdba MS |
3158 | conversion will have been performed on the operands at this |
3159 | point, so we have to dig out the original type to find out if | |
3160 | it was unsigned. */ | |
3161 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3162 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3163 | || (TREE_CODE (op1) == INTEGER_CST | |
3164 | && (TREE_INT_CST_LOW (op1) != -1 | |
3165 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3166 | common = 1; | |
3167 | } | |
3168 | break; | |
3169 | ||
3170 | case BIT_AND_EXPR: | |
3171 | case BIT_ANDTC_EXPR: | |
3172 | case BIT_IOR_EXPR: | |
3173 | case BIT_XOR_EXPR: | |
3174 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3175 | shorten = -1; | |
3176 | /* If one operand is a constant, and the other is a short type | |
3177 | that has been converted to an int, | |
3178 | really do the work in the short type and then convert the | |
3179 | result to int. If we are lucky, the constant will be 0 or 1 | |
3180 | in the short type, making the entire operation go away. */ | |
3181 | if (TREE_CODE (op0) == INTEGER_CST | |
3182 | && TREE_CODE (op1) == NOP_EXPR | |
3183 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
3184 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
3185 | { | |
3186 | final_type = result_type; | |
3187 | op1 = TREE_OPERAND (op1, 0); | |
3188 | result_type = TREE_TYPE (op1); | |
3189 | } | |
3190 | if (TREE_CODE (op1) == INTEGER_CST | |
3191 | && TREE_CODE (op0) == NOP_EXPR | |
3192 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
3193 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3194 | { | |
3195 | final_type = result_type; | |
3196 | op0 = TREE_OPERAND (op0, 0); | |
3197 | result_type = TREE_TYPE (op0); | |
3198 | } | |
3199 | break; | |
3200 | ||
3201 | case TRUNC_MOD_EXPR: | |
3202 | case FLOOR_MOD_EXPR: | |
a0a33927 | 3203 | if (code1 == INTEGER_TYPE && integer_zerop (op1)) |
5b605f68 | 3204 | cp_warning ("division by zero in `%E % 0'", op0); |
a0a33927 | 3205 | else if (code1 == REAL_TYPE && real_zerop (op1)) |
5b605f68 | 3206 | cp_warning ("division by zero in `%E % 0.'", op0); |
a0a33927 | 3207 | |
8d08fdba MS |
3208 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
3209 | { | |
3210 | /* Although it would be tempting to shorten always here, that loses | |
3211 | on some targets, since the modulo instruction is undefined if the | |
3212 | quotient can't be represented in the computation mode. We shorten | |
3213 | only if unsigned or if dividing by something we know != -1. */ | |
3214 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3215 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3216 | || (TREE_CODE (op1) == INTEGER_CST | |
3217 | && (TREE_INT_CST_LOW (op1) != -1 | |
3218 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3219 | common = 1; | |
3220 | } | |
3221 | break; | |
3222 | ||
3223 | case TRUTH_ANDIF_EXPR: | |
3224 | case TRUTH_ORIF_EXPR: | |
3225 | case TRUTH_AND_EXPR: | |
3226 | case TRUTH_OR_EXPR: | |
255512c1 | 3227 | result_type = boolean_type_node; |
8d08fdba MS |
3228 | break; |
3229 | ||
3230 | /* Shift operations: result has same type as first operand; | |
3231 | always convert second operand to int. | |
3232 | Also set SHORT_SHIFT if shifting rightward. */ | |
3233 | ||
3234 | case RSHIFT_EXPR: | |
3235 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3236 | { | |
3237 | result_type = type0; | |
3238 | if (TREE_CODE (op1) == INTEGER_CST) | |
3239 | { | |
3240 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3241 | warning ("right shift count is negative"); | |
3242 | else | |
3243 | { | |
3244 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
3245 | short_shift = 1; | |
3246 | if (TREE_INT_CST_HIGH (op1) != 0 | |
3247 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3248 | >= TYPE_PRECISION (type0))) | |
3249 | warning ("right shift count >= width of type"); | |
3250 | } | |
3251 | } | |
3252 | /* Convert the shift-count to an integer, regardless of | |
3253 | size of value being shifted. */ | |
3254 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3255 | op1 = convert (integer_type_node, op1); | |
3256 | /* Avoid converting op1 to result_type later. */ | |
3257 | converted = 1; | |
3258 | } | |
3259 | break; | |
3260 | ||
3261 | case LSHIFT_EXPR: | |
3262 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3263 | { | |
3264 | result_type = type0; | |
3265 | if (TREE_CODE (op1) == INTEGER_CST) | |
3266 | { | |
3267 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3268 | warning ("left shift count is negative"); | |
3269 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3270 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3271 | >= TYPE_PRECISION (type0))) | |
3272 | warning ("left shift count >= width of type"); | |
3273 | } | |
3274 | /* Convert the shift-count to an integer, regardless of | |
3275 | size of value being shifted. */ | |
3276 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3277 | op1 = convert (integer_type_node, op1); | |
3278 | /* Avoid converting op1 to result_type later. */ | |
3279 | converted = 1; | |
3280 | } | |
3281 | break; | |
3282 | ||
3283 | case RROTATE_EXPR: | |
3284 | case LROTATE_EXPR: | |
3285 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3286 | { | |
3287 | result_type = type0; | |
3288 | if (TREE_CODE (op1) == INTEGER_CST) | |
3289 | { | |
3290 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3291 | warning ("%s rotate count is negative", | |
3292 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3293 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3294 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3295 | >= TYPE_PRECISION (type0))) | |
3296 | warning ("%s rotate count >= width of type", | |
3297 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3298 | } | |
3299 | /* Convert the shift-count to an integer, regardless of | |
3300 | size of value being shifted. */ | |
3301 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3302 | op1 = convert (integer_type_node, op1); | |
3303 | } | |
3304 | break; | |
3305 | ||
3306 | case EQ_EXPR: | |
3307 | case NE_EXPR: | |
28cbf42c | 3308 | build_type = boolean_type_node; |
8d08fdba MS |
3309 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
3310 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3311 | short_compare = 1; | |
3312 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3313 | { | |
3314 | register tree tt0 = TYPE_MAIN_VARIANT (TREE_TYPE (type0)); | |
3315 | register tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (type1)); | |
28cbf42c MS |
3316 | |
3317 | if (comp_target_types (type0, type1, 1)) | |
3318 | result_type = common_type (type0, type1); | |
8d08fdba MS |
3319 | else if (tt0 == void_type_node) |
3320 | { | |
a4443a08 MS |
3321 | if (pedantic && TREE_CODE (tt1) == FUNCTION_TYPE |
3322 | && tree_int_cst_lt (TYPE_SIZE (type0), TYPE_SIZE (type1))) | |
8d08fdba | 3323 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
b7484fbe MS |
3324 | else if (TREE_CODE (tt1) == OFFSET_TYPE) |
3325 | pedwarn ("ANSI C++ forbids conversion of a pointer to member to `void *'"); | |
8d08fdba MS |
3326 | } |
3327 | else if (tt1 == void_type_node) | |
3328 | { | |
a4443a08 MS |
3329 | if (pedantic && TREE_CODE (tt0) == FUNCTION_TYPE |
3330 | && tree_int_cst_lt (TYPE_SIZE (type1), TYPE_SIZE (type0))) | |
8d08fdba MS |
3331 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
3332 | } | |
8d08fdba | 3333 | else |
2986ae00 MS |
3334 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", |
3335 | type0, type1); | |
faae18ab MS |
3336 | |
3337 | if (result_type == NULL_TREE) | |
3338 | result_type = ptr_type_node; | |
8d08fdba MS |
3339 | } |
3340 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3341 | && integer_zerop (op1)) | |
faae18ab | 3342 | result_type = type0; |
8d08fdba MS |
3343 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3344 | && integer_zerop (op0)) | |
faae18ab | 3345 | result_type = type1; |
8d08fdba MS |
3346 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3347 | { | |
faae18ab | 3348 | result_type = type0; |
8d08fdba | 3349 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3350 | } |
3351 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3352 | { | |
faae18ab | 3353 | result_type = type1; |
8d08fdba | 3354 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3355 | } |
3356 | else if (TYPE_PTRMEMFUNC_P (type0) && TREE_CODE (op1) == INTEGER_CST | |
3357 | && integer_zerop (op1)) | |
3358 | { | |
4dabb379 | 3359 | op0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba | 3360 | op1 = integer_zero_node; |
faae18ab | 3361 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3362 | } |
3363 | else if (TYPE_PTRMEMFUNC_P (type1) && TREE_CODE (op0) == INTEGER_CST | |
3364 | && integer_zerop (op0)) | |
3365 | { | |
4dabb379 | 3366 | op0 = build_component_ref (op1, index_identifier, NULL_TREE, 0); |
8d08fdba | 3367 | op1 = integer_zero_node; |
faae18ab | 3368 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3369 | } |
3370 | else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1) | |
3371 | && (TYPE_PTRMEMFUNC_FN_TYPE (type0) | |
3372 | == TYPE_PTRMEMFUNC_FN_TYPE (type1))) | |
3373 | { | |
3374 | /* The code we generate for the test is: | |
3375 | ||
3376 | (op0.index == op1.index | |
3377 | && ((op1.index != -1 && op0.delta2 == op1.delta2) | |
3378 | || op0.pfn == op1.pfn)) */ | |
3379 | ||
4dabb379 MS |
3380 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
3381 | tree index1 = save_expr (build_component_ref (op1, index_identifier, NULL_TREE, 0)); | |
8d08fdba MS |
3382 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); |
3383 | tree pfn1 = PFN_FROM_PTRMEMFUNC (op1); | |
3384 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3385 | tree delta21 = DELTA2_FROM_PTRMEMFUNC (op1); | |
3386 | tree e1, e2, e3; | |
3387 | tree integer_neg_one_node | |
e1cd6e56 | 3388 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3389 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3390 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3391 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3392 | e3 = build_binary_op (EQ_EXPR, pfn0, pfn1, 1); | |
3393 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3394 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3395 | if (code == EQ_EXPR) | |
3396 | return e2; | |
3397 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3398 | } | |
3399 | else if (TYPE_PTRMEMFUNC_P (type0) | |
3400 | && TYPE_PTRMEMFUNC_FN_TYPE (type0) == type1) | |
3401 | { | |
4dabb379 | 3402 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba MS |
3403 | tree index1; |
3404 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); | |
3405 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3406 | tree delta21 = integer_zero_node; | |
3407 | tree e1, e2, e3; | |
3408 | tree integer_neg_one_node | |
e1cd6e56 | 3409 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3410 | if (TREE_CODE (TREE_OPERAND (op1, 0)) == FUNCTION_DECL |
3411 | && DECL_VINDEX (TREE_OPERAND (op1, 0))) | |
3412 | { | |
3413 | /* Map everything down one to make room for the null pointer to member. */ | |
3414 | index1 = size_binop (PLUS_EXPR, | |
3415 | DECL_VINDEX (TREE_OPERAND (op1, 0)), | |
3416 | integer_one_node); | |
3417 | op1 = integer_zero_node; | |
3418 | delta21 = CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE (TREE_TYPE (type1))); | |
3419 | delta21 = DECL_FIELD_BITPOS (delta21); | |
3420 | delta21 = size_binop (FLOOR_DIV_EXPR, delta21, size_int (BITS_PER_UNIT)); | |
3421 | } | |
3422 | else | |
3423 | index1 = integer_neg_one_node; | |
51c184be MS |
3424 | { |
3425 | tree nop1 = build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type0), op1); | |
3426 | TREE_CONSTANT (nop1) = TREE_CONSTANT (op1); | |
3427 | op1 = nop1; | |
3428 | } | |
8d08fdba MS |
3429 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3430 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3431 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3432 | e3 = build_binary_op (EQ_EXPR, pfn0, op1, 1); | |
3433 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3434 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3435 | if (code == EQ_EXPR) | |
3436 | return e2; | |
3437 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3438 | } | |
3439 | else if (TYPE_PTRMEMFUNC_P (type1) | |
3440 | && TYPE_PTRMEMFUNC_FN_TYPE (type1) == type0) | |
3441 | { | |
3442 | return build_binary_op (code, op1, op0, 1); | |
3443 | } | |
8d08fdba MS |
3444 | break; |
3445 | ||
3446 | case MAX_EXPR: | |
3447 | case MIN_EXPR: | |
3448 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3449 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3450 | shorten = 1; | |
3451 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3452 | { | |
faae18ab MS |
3453 | if (comp_target_types (type0, type1, 1)) |
3454 | result_type = common_type (type0, type1); | |
3455 | else | |
28cbf42c MS |
3456 | { |
3457 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3458 | type0, type1); | |
3459 | result_type = ptr_type_node; | |
3460 | } | |
8d08fdba MS |
3461 | } |
3462 | break; | |
3463 | ||
3464 | case LE_EXPR: | |
3465 | case GE_EXPR: | |
3466 | case LT_EXPR: | |
3467 | case GT_EXPR: | |
28cbf42c | 3468 | build_type = boolean_type_node; |
8d08fdba MS |
3469 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
3470 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3471 | short_compare = 1; | |
3472 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3473 | { | |
faae18ab | 3474 | if (comp_target_types (type0, type1, 1)) |
28cbf42c | 3475 | result_type = common_type (type0, type1); |
faae18ab MS |
3476 | else |
3477 | { | |
3478 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3479 | type0, type1); | |
3480 | result_type = ptr_type_node; | |
3481 | } | |
8d08fdba MS |
3482 | } |
3483 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3484 | && integer_zerop (op1)) | |
faae18ab | 3485 | result_type = type0; |
8d08fdba MS |
3486 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3487 | && integer_zerop (op0)) | |
faae18ab | 3488 | result_type = type1; |
8d08fdba MS |
3489 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3490 | { | |
faae18ab | 3491 | result_type = type0; |
8d08fdba MS |
3492 | if (pedantic) |
3493 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); | |
3494 | else if (! flag_traditional) | |
3495 | warning ("comparison between pointer and integer"); | |
8d08fdba MS |
3496 | } |
3497 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3498 | { | |
faae18ab | 3499 | result_type = type1; |
8d08fdba MS |
3500 | if (pedantic) |
3501 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); | |
3502 | else if (! flag_traditional) | |
3503 | warning ("comparison between pointer and integer"); | |
8d08fdba | 3504 | } |
8d08fdba MS |
3505 | break; |
3506 | } | |
3507 | ||
3508 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3509 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3510 | { | |
3511 | if (shorten || common || short_compare) | |
3512 | result_type = common_type (type0, type1); | |
3513 | ||
3514 | /* For certain operations (which identify themselves by shorten != 0) | |
3515 | if both args were extended from the same smaller type, | |
3516 | do the arithmetic in that type and then extend. | |
3517 | ||
3518 | shorten !=0 and !=1 indicates a bitwise operation. | |
3519 | For them, this optimization is safe only if | |
3520 | both args are zero-extended or both are sign-extended. | |
3521 | Otherwise, we might change the result. | |
3522 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
3523 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
3524 | ||
3525 | if (shorten) | |
3526 | { | |
3527 | int unsigned0, unsigned1; | |
3528 | tree arg0 = get_narrower (op0, &unsigned0); | |
3529 | tree arg1 = get_narrower (op1, &unsigned1); | |
3530 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
3531 | int uns = TREE_UNSIGNED (result_type); | |
3532 | tree type; | |
3533 | ||
3534 | final_type = result_type; | |
3535 | ||
3536 | /* Handle the case that OP0 does not *contain* a conversion | |
3537 | but it *requires* conversion to FINAL_TYPE. */ | |
3538 | ||
3539 | if (op0 == arg0 && TREE_TYPE (op0) != final_type) | |
3540 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3541 | if (op1 == arg1 && TREE_TYPE (op1) != final_type) | |
3542 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); | |
3543 | ||
3544 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
3545 | ||
3546 | /* For bitwise operations, signedness of nominal type | |
3547 | does not matter. Consider only how operands were extended. */ | |
3548 | if (shorten == -1) | |
3549 | uns = unsigned0; | |
3550 | ||
3551 | /* Note that in all three cases below we refrain from optimizing | |
3552 | an unsigned operation on sign-extended args. | |
3553 | That would not be valid. */ | |
3554 | ||
3555 | /* Both args variable: if both extended in same way | |
3556 | from same width, do it in that width. | |
3557 | Do it unsigned if args were zero-extended. */ | |
3558 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
3559 | < TYPE_PRECISION (result_type)) | |
3560 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3561 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
3562 | && unsigned0 == unsigned1 | |
3563 | && (unsigned0 || !uns)) | |
3564 | result_type | |
3565 | = signed_or_unsigned_type (unsigned0, | |
3566 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
3567 | else if (TREE_CODE (arg0) == INTEGER_CST | |
3568 | && (unsigned1 || !uns) | |
3569 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3570 | < TYPE_PRECISION (result_type)) | |
3571 | && (type = signed_or_unsigned_type (unsigned1, | |
3572 | TREE_TYPE (arg1)), | |
3573 | int_fits_type_p (arg0, type))) | |
3574 | result_type = type; | |
3575 | else if (TREE_CODE (arg1) == INTEGER_CST | |
3576 | && (unsigned0 || !uns) | |
3577 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
3578 | < TYPE_PRECISION (result_type)) | |
3579 | && (type = signed_or_unsigned_type (unsigned0, | |
3580 | TREE_TYPE (arg0)), | |
3581 | int_fits_type_p (arg1, type))) | |
3582 | result_type = type; | |
3583 | } | |
3584 | ||
3585 | /* Shifts can be shortened if shifting right. */ | |
3586 | ||
3587 | if (short_shift) | |
3588 | { | |
3589 | int unsigned_arg; | |
3590 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
3591 | ||
3592 | final_type = result_type; | |
3593 | ||
3594 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
3595 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3596 | ||
3597 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
db5ae43f MS |
3598 | /* We can shorten only if the shift count is less than the |
3599 | number of bits in the smaller type size. */ | |
3600 | && TREE_INT_CST_HIGH (op1) == 0 | |
3601 | && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1) | |
8d08fdba MS |
3602 | /* If arg is sign-extended and then unsigned-shifted, |
3603 | we can simulate this with a signed shift in arg's type | |
3604 | only if the extended result is at least twice as wide | |
3605 | as the arg. Otherwise, the shift could use up all the | |
3606 | ones made by sign-extension and bring in zeros. | |
3607 | We can't optimize that case at all, but in most machines | |
3608 | it never happens because available widths are 2**N. */ | |
3609 | && (!TREE_UNSIGNED (final_type) | |
3610 | || unsigned_arg | |
5566b478 | 3611 | || (((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0))) |
8d08fdba MS |
3612 | <= TYPE_PRECISION (result_type)))) |
3613 | { | |
3614 | /* Do an unsigned shift if the operand was zero-extended. */ | |
3615 | result_type | |
3616 | = signed_or_unsigned_type (unsigned_arg, | |
3617 | TREE_TYPE (arg0)); | |
3618 | /* Convert value-to-be-shifted to that type. */ | |
3619 | if (TREE_TYPE (op0) != result_type) | |
3620 | op0 = convert (result_type, op0); | |
3621 | converted = 1; | |
3622 | } | |
3623 | } | |
3624 | ||
3625 | /* Comparison operations are shortened too but differently. | |
3626 | They identify themselves by setting short_compare = 1. */ | |
3627 | ||
3628 | if (short_compare) | |
3629 | { | |
3630 | /* Don't write &op0, etc., because that would prevent op0 | |
3631 | from being kept in a register. | |
3632 | Instead, make copies of the our local variables and | |
3633 | pass the copies by reference, then copy them back afterward. */ | |
3634 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
3635 | enum tree_code xresultcode = resultcode; | |
3636 | tree val | |
3637 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
3638 | if (val != 0) | |
255512c1 | 3639 | return convert (boolean_type_node, val); |
28cbf42c MS |
3640 | op0 = xop0, op1 = xop1; |
3641 | converted = 1; | |
8d08fdba MS |
3642 | resultcode = xresultcode; |
3643 | } | |
3644 | ||
2ee887f2 | 3645 | if (short_compare && warn_sign_compare) |
8d08fdba | 3646 | { |
e3417fcd MS |
3647 | int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); |
3648 | int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3649 | ||
8d08fdba MS |
3650 | int unsignedp0, unsignedp1; |
3651 | tree primop0 = get_narrower (op0, &unsignedp0); | |
3652 | tree primop1 = get_narrower (op1, &unsignedp1); | |
3653 | ||
72b7eeff MS |
3654 | /* Check for comparison of different enum types. */ |
3655 | if (flag_int_enum_equivalence == 0 | |
3656 | && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE | |
3657 | && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE | |
3658 | && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0)) | |
3659 | != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1))) | |
3660 | { | |
3661 | cp_warning ("comparison between `%#T' and `%#T'", | |
3662 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1)); | |
3663 | } | |
3664 | ||
e3417fcd | 3665 | /* Give warnings for comparisons between signed and unsigned |
faae18ab | 3666 | quantities that may fail. */ |
e3417fcd MS |
3667 | /* Do the checking based on the original operand trees, so that |
3668 | casts will be considered, but default promotions won't be. */ | |
faae18ab MS |
3669 | |
3670 | /* Do not warn if the comparison is being done in a signed type, | |
3671 | since the signed type will only be chosen if it can represent | |
3672 | all the values of the unsigned type. */ | |
3673 | if (! TREE_UNSIGNED (result_type)) | |
3674 | /* OK */; | |
b19b4a78 MS |
3675 | /* Do not warn if both operands are unsigned. */ |
3676 | else if (op0_signed == op1_signed) | |
3677 | /* OK */; | |
faae18ab MS |
3678 | /* Do not warn if the signed quantity is an unsuffixed |
3679 | integer literal (or some static constant expression | |
3680 | involving such literals) and it is non-negative. */ | |
3681 | else if ((op0_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3682 | && tree_int_cst_sgn (orig_op0) >= 0) | |
3683 | || (op1_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3684 | && tree_int_cst_sgn (orig_op1) >= 0)) | |
3685 | /* OK */; | |
3686 | /* Do not warn if the comparison is an equality operation, | |
3687 | the unsigned quantity is an integral constant and it does | |
3688 | not use the most significant bit of result_type. */ | |
3689 | else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
3690 | && ((op0_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3691 | && int_fits_type_p (orig_op1, signed_type (result_type)) | |
3692 | || (op1_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3693 | && int_fits_type_p (orig_op0, signed_type (result_type)))))) | |
3694 | /* OK */; | |
3695 | else | |
e3417fcd | 3696 | warning ("comparison between signed and unsigned"); |
8d08fdba MS |
3697 | |
3698 | /* Warn if two unsigned values are being compared in a size | |
3699 | larger than their original size, and one (and only one) is the | |
3700 | result of a `~' operator. This comparison will always fail. | |
3701 | ||
3702 | Also warn if one operand is a constant, and the constant does not | |
3703 | have all bits set that are set in the ~ operand when it is | |
3704 | extended. */ | |
3705 | ||
5566b478 MS |
3706 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) |
3707 | ^ (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
8d08fdba MS |
3708 | { |
3709 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
3710 | primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); | |
3711 | if (TREE_CODE (primop1) == BIT_NOT_EXPR) | |
3712 | primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); | |
3713 | ||
3714 | if (TREE_CODE (primop0) == INTEGER_CST | |
3715 | || TREE_CODE (primop1) == INTEGER_CST) | |
3716 | { | |
3717 | tree primop; | |
3718 | HOST_WIDE_INT constant, mask; | |
3719 | int unsignedp; | |
3720 | unsigned bits; | |
3721 | ||
3722 | if (TREE_CODE (primop0) == INTEGER_CST) | |
3723 | { | |
3724 | primop = primop1; | |
3725 | unsignedp = unsignedp1; | |
3726 | constant = TREE_INT_CST_LOW (primop0); | |
3727 | } | |
3728 | else | |
3729 | { | |
3730 | primop = primop0; | |
3731 | unsignedp = unsignedp0; | |
3732 | constant = TREE_INT_CST_LOW (primop1); | |
3733 | } | |
3734 | ||
3735 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
faae18ab | 3736 | if (bits < TYPE_PRECISION (result_type) |
8d08fdba MS |
3737 | && bits < HOST_BITS_PER_LONG && unsignedp) |
3738 | { | |
3739 | mask = (~ (HOST_WIDE_INT) 0) << bits; | |
3740 | if ((mask & constant) != mask) | |
3741 | warning ("comparison of promoted ~unsigned with constant"); | |
3742 | } | |
3743 | } | |
3744 | else if (unsignedp0 && unsignedp1 | |
3745 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
faae18ab | 3746 | < TYPE_PRECISION (result_type)) |
8d08fdba | 3747 | && (TYPE_PRECISION (TREE_TYPE (primop1)) |
faae18ab | 3748 | < TYPE_PRECISION (result_type))) |
8d08fdba MS |
3749 | warning ("comparison of promoted ~unsigned with unsigned"); |
3750 | } | |
3751 | } | |
3752 | } | |
3753 | ||
3754 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
3755 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
3756 | Then the expression will be built. | |
3757 | It will be given type FINAL_TYPE if that is nonzero; | |
3758 | otherwise, it will be given type RESULT_TYPE. */ | |
3759 | ||
3760 | if (!result_type) | |
3761 | { | |
faae18ab MS |
3762 | cp_error ("invalid operands `%T' and `%T' to binary `%O'", |
3763 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), error_code); | |
8d08fdba MS |
3764 | return error_mark_node; |
3765 | } | |
3766 | ||
3767 | if (! converted) | |
3768 | { | |
3769 | if (TREE_TYPE (op0) != result_type) | |
3770 | op0 = convert (result_type, op0); | |
3771 | if (TREE_TYPE (op1) != result_type) | |
3772 | op1 = convert (result_type, op1); | |
3773 | } | |
3774 | ||
28cbf42c MS |
3775 | if (build_type == NULL_TREE) |
3776 | build_type = result_type; | |
3777 | ||
8d08fdba | 3778 | { |
28cbf42c | 3779 | register tree result = build (resultcode, build_type, op0, op1); |
8d08fdba MS |
3780 | register tree folded; |
3781 | ||
3782 | folded = fold (result); | |
3783 | if (folded == result) | |
3784 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3785 | if (final_type != 0) | |
3786 | return convert (final_type, folded); | |
3787 | return folded; | |
3788 | } | |
3789 | } | |
3790 | \f | |
3791 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
3792 | of pointer PTROP and integer INTOP. */ | |
3793 | ||
3794 | static tree | |
3795 | pointer_int_sum (resultcode, ptrop, intop) | |
3796 | enum tree_code resultcode; | |
3797 | register tree ptrop, intop; | |
3798 | { | |
3799 | tree size_exp; | |
3800 | ||
3801 | register tree result; | |
3802 | register tree folded = fold (intop); | |
3803 | ||
3804 | /* The result is a pointer of the same type that is being added. */ | |
3805 | ||
3806 | register tree result_type = TREE_TYPE (ptrop); | |
3807 | ||
8d08fdba MS |
3808 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) |
3809 | { | |
3810 | if (pedantic || warn_pointer_arith) | |
3811 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic"); | |
3812 | size_exp = integer_one_node; | |
3813 | } | |
3814 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
3815 | { | |
3816 | if (pedantic || warn_pointer_arith) | |
3817 | pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic"); | |
3818 | size_exp = integer_one_node; | |
3819 | } | |
3820 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
3821 | { | |
3822 | if (pedantic || warn_pointer_arith) | |
3823 | pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic"); | |
3824 | size_exp = integer_one_node; | |
3825 | } | |
3826 | else if (TREE_CODE (TREE_TYPE (result_type)) == OFFSET_TYPE) | |
3827 | { | |
be99da77 | 3828 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3829 | pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic"); |
3830 | size_exp = integer_one_node; | |
3831 | } | |
3832 | else | |
5566b478 | 3833 | size_exp = size_in_bytes (complete_type (TREE_TYPE (result_type))); |
8d08fdba | 3834 | |
a4443a08 MS |
3835 | /* Needed to make OOPS V2R3 work. */ |
3836 | intop = folded; | |
3837 | if (TREE_CODE (intop) == INTEGER_CST | |
3838 | && TREE_INT_CST_LOW (intop) == 0 | |
3839 | && TREE_INT_CST_HIGH (intop) == 0) | |
3840 | return ptrop; | |
3841 | ||
8d08fdba MS |
3842 | /* If what we are about to multiply by the size of the elements |
3843 | contains a constant term, apply distributive law | |
3844 | and multiply that constant term separately. | |
3845 | This helps produce common subexpressions. */ | |
3846 | ||
3847 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
3848 | && ! TREE_CONSTANT (intop) | |
3849 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
3850 | && TREE_CONSTANT (size_exp)) | |
3851 | { | |
3852 | enum tree_code subcode = resultcode; | |
3853 | if (TREE_CODE (intop) == MINUS_EXPR) | |
3854 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
3855 | ptrop = build_binary_op (subcode, ptrop, TREE_OPERAND (intop, 1), 1); | |
3856 | intop = TREE_OPERAND (intop, 0); | |
3857 | } | |
3858 | ||
9e9ff709 | 3859 | /* Convert the integer argument to a type the same size as sizetype |
8d08fdba MS |
3860 | so the multiply won't overflow spuriously. */ |
3861 | ||
9e9ff709 MS |
3862 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)) |
3863 | intop = convert (type_for_size (TYPE_PRECISION (sizetype), 0), intop); | |
8d08fdba | 3864 | |
39211cd5 MS |
3865 | /* Replace the integer argument with a suitable product by the object size. |
3866 | Do this multiplication as signed, then convert to the appropriate | |
3867 | pointer type (actually unsigned integral). */ | |
8d08fdba | 3868 | |
39211cd5 MS |
3869 | intop = convert (result_type, |
3870 | build_binary_op (MULT_EXPR, intop, | |
3871 | convert (TREE_TYPE (intop), size_exp), 1)); | |
8d08fdba MS |
3872 | |
3873 | /* Create the sum or difference. */ | |
3874 | ||
3875 | result = build (resultcode, result_type, ptrop, intop); | |
3876 | ||
3877 | folded = fold (result); | |
3878 | if (folded == result) | |
3879 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
3880 | return folded; | |
3881 | } | |
3882 | ||
3883 | /* Return a tree for the difference of pointers OP0 and OP1. | |
3884 | The resulting tree has type int. */ | |
3885 | ||
3886 | static tree | |
3887 | pointer_diff (op0, op1) | |
3888 | register tree op0, op1; | |
3889 | { | |
3890 | register tree result, folded; | |
3891 | tree restype = ptrdiff_type_node; | |
3892 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
3893 | ||
be99da77 | 3894 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3895 | { |
3896 | if (TREE_CODE (target_type) == VOID_TYPE) | |
3897 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction"); | |
3898 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
3899 | pedwarn ("ANSI C++ forbids using pointer to a function in subtraction"); | |
3900 | if (TREE_CODE (target_type) == METHOD_TYPE) | |
3901 | pedwarn ("ANSI C++ forbids using pointer to a method in subtraction"); | |
3902 | if (TREE_CODE (target_type) == OFFSET_TYPE) | |
3903 | pedwarn ("ANSI C++ forbids using pointer to a member in subtraction"); | |
3904 | } | |
3905 | ||
3906 | /* First do the subtraction as integers; | |
3907 | then drop through to build the divide operator. */ | |
3908 | ||
3909 | op0 = build_binary_op (MINUS_EXPR, | |
3910 | convert (restype, op0), convert (restype, op1), 1); | |
3911 | ||
3912 | /* This generates an error if op1 is a pointer to an incomplete type. */ | |
3913 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) | |
3914 | error ("arithmetic on pointer to an incomplete type"); | |
3915 | ||
3916 | op1 = ((TREE_CODE (target_type) == VOID_TYPE | |
3917 | || TREE_CODE (target_type) == FUNCTION_TYPE | |
3918 | || TREE_CODE (target_type) == METHOD_TYPE | |
3919 | || TREE_CODE (target_type) == OFFSET_TYPE) | |
3920 | ? integer_one_node | |
3921 | : size_in_bytes (target_type)); | |
3922 | ||
3923 | /* Do the division. */ | |
3924 | ||
39211cd5 | 3925 | result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); |
8d08fdba MS |
3926 | |
3927 | folded = fold (result); | |
3928 | if (folded == result) | |
3929 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3930 | return folded; | |
3931 | } | |
3932 | \f | |
3933 | /* Handle the case of taking the address of a COMPONENT_REF. | |
3934 | Called by `build_unary_op' and `build_up_reference'. | |
3935 | ||
3936 | ARG is the COMPONENT_REF whose address we want. | |
3937 | ARGTYPE is the pointer type that this address should have. | |
3938 | MSG is an error message to print if this COMPONENT_REF is not | |
3939 | addressable (such as a bitfield). */ | |
3940 | ||
3941 | tree | |
3942 | build_component_addr (arg, argtype, msg) | |
3943 | tree arg, argtype; | |
3944 | char *msg; | |
3945 | { | |
3946 | tree field = TREE_OPERAND (arg, 1); | |
3947 | tree basetype = decl_type_context (field); | |
3948 | tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3949 | ||
3950 | if (DECL_BIT_FIELD (field)) | |
3951 | { | |
3952 | error (msg, IDENTIFIER_POINTER (DECL_NAME (field))); | |
3953 | return error_mark_node; | |
3954 | } | |
3955 | ||
8d08fdba MS |
3956 | if (TREE_CODE (field) == FIELD_DECL |
3957 | && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
51c184be MS |
3958 | { |
3959 | /* Can't convert directly to ARGTYPE, since that | |
3960 | may have the same pointer type as one of our | |
3961 | baseclasses. */ | |
3962 | rval = build1 (NOP_EXPR, argtype, | |
3963 | convert_pointer_to (basetype, rval)); | |
8926095f | 3964 | TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0)); |
51c184be | 3965 | } |
8d08fdba MS |
3966 | else |
3967 | /* This conversion is harmless. */ | |
6060a796 | 3968 | rval = convert_force (argtype, rval, 0); |
8d08fdba MS |
3969 | |
3970 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
3971 | { | |
3972 | tree offset = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
3973 | size_int (BITS_PER_UNIT)); | |
3974 | int flag = TREE_CONSTANT (rval); | |
3975 | rval = fold (build (PLUS_EXPR, argtype, | |
3976 | rval, convert (argtype, offset))); | |
3977 | TREE_CONSTANT (rval) = flag; | |
3978 | } | |
3979 | return rval; | |
3980 | } | |
3981 | ||
3982 | /* Construct and perhaps optimize a tree representation | |
3983 | for a unary operation. CODE, a tree_code, specifies the operation | |
3984 | and XARG is the operand. */ | |
3985 | ||
3986 | tree | |
3987 | build_x_unary_op (code, xarg) | |
3988 | enum tree_code code; | |
3989 | tree xarg; | |
3990 | { | |
5566b478 MS |
3991 | if (current_template_parms) |
3992 | return build_min_nt (code, xarg, NULL_TREE); | |
3993 | ||
8d08fdba MS |
3994 | /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an |
3995 | error message. */ | |
db5ae43f MS |
3996 | if (code == ADDR_EXPR |
3997 | && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg))) | |
3998 | && TYPE_SIZE (TREE_TYPE (xarg)) == NULL_TREE) | |
3999 | || (TREE_CODE (xarg) == OFFSET_REF))) | |
4000 | /* don't look for a function */; | |
4001 | else | |
8d08fdba MS |
4002 | { |
4003 | tree rval = build_opfncall (code, LOOKUP_SPECULATIVELY, xarg, | |
4004 | NULL_TREE, NULL_TREE); | |
4005 | if (rval) | |
4006 | return build_opfncall (code, LOOKUP_NORMAL, xarg, | |
4007 | NULL_TREE, NULL_TREE); | |
4008 | } | |
c91a56d2 MS |
4009 | |
4010 | if (code == ADDR_EXPR) | |
4011 | { | |
4012 | if (TREE_CODE (xarg) == TARGET_EXPR) | |
4013 | warning ("taking address of temporary"); | |
4014 | } | |
4015 | ||
8d08fdba MS |
4016 | return build_unary_op (code, xarg, 0); |
4017 | } | |
4018 | ||
8ccc31eb MS |
4019 | /* Just like truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */ |
4020 | ||
2986ae00 | 4021 | tree |
8ccc31eb | 4022 | condition_conversion (expr) |
2986ae00 MS |
4023 | tree expr; |
4024 | { | |
5566b478 MS |
4025 | tree t; |
4026 | if (current_template_parms) | |
4027 | return expr; | |
4028 | t = convert (boolean_type_node, expr); | |
8ccc31eb MS |
4029 | t = fold (build1 (CLEANUP_POINT_EXPR, boolean_type_node, t)); |
4030 | return t; | |
2986ae00 | 4031 | } |
8ccc31eb | 4032 | |
8d08fdba MS |
4033 | /* C++: Must handle pointers to members. |
4034 | ||
4035 | Perhaps type instantiation should be extended to handle conversion | |
4036 | from aggregates to types we don't yet know we want? (Or are those | |
4037 | cases typically errors which should be reported?) | |
4038 | ||
4039 | NOCONVERT nonzero suppresses the default promotions | |
4040 | (such as from short to int). */ | |
4041 | tree | |
4042 | build_unary_op (code, xarg, noconvert) | |
4043 | enum tree_code code; | |
4044 | tree xarg; | |
4045 | int noconvert; | |
4046 | { | |
4047 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
4048 | register tree arg = xarg; | |
4049 | register tree argtype = 0; | |
8d08fdba MS |
4050 | char *errstring = NULL; |
4051 | tree val; | |
8d08fdba | 4052 | |
b7484fbe | 4053 | if (arg == error_mark_node) |
8d08fdba MS |
4054 | return error_mark_node; |
4055 | ||
8d08fdba MS |
4056 | switch (code) |
4057 | { | |
4058 | case CONVERT_EXPR: | |
4059 | /* This is used for unary plus, because a CONVERT_EXPR | |
4060 | is enough to prevent anybody from looking inside for | |
4061 | associativity, but won't generate any code. */ | |
b7484fbe MS |
4062 | if (!(arg = build_expr_type_conversion |
4063 | (WANT_ARITH | WANT_ENUM | WANT_POINTER, arg, 1))) | |
4064 | errstring = "wrong type argument to unary plus"; | |
4065 | else | |
8d08fdba MS |
4066 | { |
4067 | if (!noconvert) | |
b7484fbe MS |
4068 | arg = default_conversion (arg); |
4069 | arg = build1 (NON_LVALUE_EXPR, TREE_TYPE (arg), arg); | |
8d08fdba | 4070 | } |
b7484fbe | 4071 | break; |
8d08fdba | 4072 | |
b7484fbe MS |
4073 | case NEGATE_EXPR: |
4074 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) | |
4075 | errstring = "wrong type argument to unary minus"; | |
8d08fdba MS |
4076 | else if (!noconvert) |
4077 | arg = default_conversion (arg); | |
4078 | break; | |
4079 | ||
4080 | case BIT_NOT_EXPR: | |
b7484fbe MS |
4081 | if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM, arg, 1))) |
4082 | errstring = "wrong type argument to bit-complement"; | |
8d08fdba MS |
4083 | else if (!noconvert) |
4084 | arg = default_conversion (arg); | |
4085 | break; | |
4086 | ||
4087 | case ABS_EXPR: | |
b7484fbe MS |
4088 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) |
4089 | errstring = "wrong type argument to abs"; | |
8d08fdba MS |
4090 | else if (!noconvert) |
4091 | arg = default_conversion (arg); | |
4092 | break; | |
4093 | ||
4094 | case TRUTH_NOT_EXPR: | |
8ccc31eb | 4095 | arg = convert (boolean_type_node, arg); |
8d08fdba | 4096 | val = invert_truthvalue (arg); |
2986ae00 MS |
4097 | if (arg != error_mark_node) |
4098 | return val; | |
4099 | errstring = "in argument to unary !"; | |
8d08fdba MS |
4100 | break; |
4101 | ||
4102 | case NOP_EXPR: | |
4103 | break; | |
4104 | ||
4105 | case PREINCREMENT_EXPR: | |
4106 | case POSTINCREMENT_EXPR: | |
4107 | case PREDECREMENT_EXPR: | |
4108 | case POSTDECREMENT_EXPR: | |
4109 | /* Handle complex lvalues (when permitted) | |
4110 | by reduction to simpler cases. */ | |
4111 | ||
4112 | val = unary_complex_lvalue (code, arg); | |
4113 | if (val != 0) | |
4114 | return val; | |
4115 | ||
4116 | /* Report invalid types. */ | |
4117 | ||
b7484fbe MS |
4118 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER, |
4119 | arg, 1))) | |
8d08fdba MS |
4120 | { |
4121 | if (code == PREINCREMENT_EXPR) | |
4122 | errstring ="no pre-increment operator for type"; | |
4123 | else if (code == POSTINCREMENT_EXPR) | |
4124 | errstring ="no post-increment operator for type"; | |
4125 | else if (code == PREDECREMENT_EXPR) | |
4126 | errstring ="no pre-decrement operator for type"; | |
4127 | else | |
4128 | errstring ="no post-decrement operator for type"; | |
4129 | break; | |
4130 | } | |
4131 | ||
4132 | /* Report something read-only. */ | |
4133 | ||
4134 | if (TYPE_READONLY (TREE_TYPE (arg)) | |
4135 | || TREE_READONLY (arg)) | |
4136 | readonly_error (arg, ((code == PREINCREMENT_EXPR | |
4137 | || code == POSTINCREMENT_EXPR) | |
4138 | ? "increment" : "decrement"), | |
4139 | 0); | |
4140 | ||
4141 | { | |
4142 | register tree inc; | |
4143 | tree result_type = TREE_TYPE (arg); | |
4144 | ||
4145 | arg = get_unwidened (arg, 0); | |
4146 | argtype = TREE_TYPE (arg); | |
4147 | ||
4148 | /* ARM $5.2.5 last annotation says this should be forbidden. */ | |
4149 | if (TREE_CODE (argtype) == ENUMERAL_TYPE) | |
4150 | pedwarn ("ANSI C++ forbids %sing an enum", | |
4151 | (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
4152 | ? "increment" : "decrement"); | |
4153 | ||
4154 | /* Compute the increment. */ | |
4155 | ||
b7484fbe | 4156 | if (TREE_CODE (argtype) == POINTER_TYPE) |
8d08fdba MS |
4157 | { |
4158 | enum tree_code tmp = TREE_CODE (TREE_TYPE (argtype)); | |
5566b478 | 4159 | if (TYPE_SIZE (complete_type (TREE_TYPE (argtype))) == 0) |
39211cd5 MS |
4160 | cp_error ("cannot %s a pointer to incomplete type `%T'", |
4161 | ((code == PREINCREMENT_EXPR | |
4162 | || code == POSTINCREMENT_EXPR) | |
4163 | ? "increment" : "decrement"), TREE_TYPE (argtype)); | |
4164 | else if (tmp == FUNCTION_TYPE || tmp == METHOD_TYPE | |
4165 | || tmp == VOID_TYPE || tmp == OFFSET_TYPE) | |
8d08fdba | 4166 | cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'", |
39211cd5 MS |
4167 | ((code == PREINCREMENT_EXPR |
4168 | || code == POSTINCREMENT_EXPR) | |
4169 | ? "increment" : "decrement"), argtype); | |
8d08fdba MS |
4170 | inc = c_sizeof_nowarn (TREE_TYPE (argtype)); |
4171 | } | |
4172 | else | |
4173 | inc = integer_one_node; | |
4174 | ||
4175 | inc = convert (argtype, inc); | |
4176 | ||
4177 | /* Handle incrementing a cast-expression. */ | |
4178 | ||
4179 | switch (TREE_CODE (arg)) | |
4180 | { | |
4181 | case NOP_EXPR: | |
4182 | case CONVERT_EXPR: | |
4183 | case FLOAT_EXPR: | |
4184 | case FIX_TRUNC_EXPR: | |
4185 | case FIX_FLOOR_EXPR: | |
4186 | case FIX_ROUND_EXPR: | |
4187 | case FIX_CEIL_EXPR: | |
4188 | { | |
72b7eeff | 4189 | tree incremented, modify, value, compound; |
f0e01782 MS |
4190 | if (! lvalue_p (arg) && pedantic) |
4191 | pedwarn ("cast to non-reference type used as lvalue"); | |
8d08fdba MS |
4192 | arg = stabilize_reference (arg); |
4193 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4194 | value = arg; | |
4195 | else | |
4196 | value = save_expr (arg); | |
4197 | incremented = build (((code == PREINCREMENT_EXPR | |
4198 | || code == POSTINCREMENT_EXPR) | |
4199 | ? PLUS_EXPR : MINUS_EXPR), | |
4200 | argtype, value, inc); | |
4201 | TREE_SIDE_EFFECTS (incremented) = 1; | |
72b7eeff | 4202 | |
8d08fdba | 4203 | modify = build_modify_expr (arg, NOP_EXPR, incremented); |
72b7eeff MS |
4204 | compound = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); |
4205 | ||
4206 | /* Eliminate warning about unused result of + or -. */ | |
4207 | TREE_NO_UNUSED_WARNING (compound) = 1; | |
4208 | return compound; | |
8d08fdba MS |
4209 | } |
4210 | } | |
4211 | ||
8d08fdba MS |
4212 | /* Complain about anything else that is not a true lvalue. */ |
4213 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
4214 | || code == POSTINCREMENT_EXPR) | |
4215 | ? "increment" : "decrement"))) | |
4216 | return error_mark_node; | |
4217 | ||
b7484fbe MS |
4218 | /* Forbid using -- on `bool'. */ |
4219 | if (TREE_TYPE (arg) == boolean_type_node) | |
4220 | { | |
4221 | if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4222 | { | |
4223 | cp_error ("invalid use of `--' on bool variable `%D'", arg); | |
4224 | return error_mark_node; | |
4225 | } | |
4226 | #if 0 | |
4227 | /* This will only work if someone can convince Kenner to accept | |
4228 | my patch to expand_increment. (jason) */ | |
4229 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4230 | #else | |
4231 | if (code == POSTINCREMENT_EXPR) | |
4232 | { | |
4233 | arg = stabilize_reference (arg); | |
4234 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4235 | boolean_true_node); | |
4236 | TREE_SIDE_EFFECTS (val) = 1; | |
4237 | arg = save_expr (arg); | |
4238 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
4239 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4240 | } | |
4241 | else | |
4242 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4243 | boolean_true_node); | |
4244 | #endif | |
4245 | } | |
4246 | else | |
4247 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4248 | ||
8d08fdba MS |
4249 | TREE_SIDE_EFFECTS (val) = 1; |
4250 | return convert (result_type, val); | |
4251 | } | |
4252 | ||
4253 | case ADDR_EXPR: | |
4254 | /* Note that this operation never does default_conversion | |
4255 | regardless of NOCONVERT. */ | |
4256 | ||
b7484fbe MS |
4257 | argtype = TREE_TYPE (arg); |
4258 | if (TREE_CODE (argtype) == REFERENCE_TYPE) | |
8d08fdba MS |
4259 | { |
4260 | arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
4261 | TREE_REFERENCE_EXPR (arg) = 1; | |
4262 | return arg; | |
4263 | } | |
a0a33927 MS |
4264 | else if (pedantic |
4265 | && TREE_CODE (arg) == FUNCTION_DECL | |
8d08fdba MS |
4266 | && DECL_NAME (arg) |
4267 | && DECL_CONTEXT (arg) == NULL_TREE | |
4268 | && IDENTIFIER_LENGTH (DECL_NAME (arg)) == 4 | |
4269 | && IDENTIFIER_POINTER (DECL_NAME (arg))[0] == 'm' | |
4270 | && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (arg)), "main")) | |
a0a33927 MS |
4271 | /* ARM $3.4 */ |
4272 | pedwarn ("taking address of function `main'"); | |
8d08fdba MS |
4273 | |
4274 | /* Let &* cancel out to simplify resulting code. */ | |
4275 | if (TREE_CODE (arg) == INDIRECT_REF) | |
4276 | { | |
4ac14744 | 4277 | /* We don't need to have `current_class_ptr' wrapped in a |
8d08fdba | 4278 | NON_LVALUE_EXPR node. */ |
4ac14744 MS |
4279 | if (arg == current_class_ref) |
4280 | return current_class_ptr; | |
8d08fdba MS |
4281 | |
4282 | /* Keep `default_conversion' from converting if | |
4283 | ARG is of REFERENCE_TYPE. */ | |
4284 | arg = TREE_OPERAND (arg, 0); | |
4285 | if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) | |
4286 | { | |
4287 | if (TREE_CODE (arg) == VAR_DECL && DECL_INITIAL (arg) | |
4288 | && !TREE_SIDE_EFFECTS (DECL_INITIAL (arg))) | |
4289 | arg = DECL_INITIAL (arg); | |
4290 | arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
4291 | TREE_REFERENCE_EXPR (arg) = 1; | |
4292 | TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); | |
4293 | } | |
4294 | else if (lvalue_p (arg)) | |
4295 | /* Don't let this be an lvalue. */ | |
4296 | return non_lvalue (arg); | |
4297 | return arg; | |
4298 | } | |
4299 | ||
4300 | /* For &x[y], return x+y */ | |
4301 | if (TREE_CODE (arg) == ARRAY_REF) | |
4302 | { | |
4303 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
4304 | return error_mark_node; | |
4305 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
4306 | TREE_OPERAND (arg, 1), 1); | |
4307 | } | |
4308 | ||
8d08fdba MS |
4309 | /* Uninstantiated types are all functions. Taking the |
4310 | address of a function is a no-op, so just return the | |
4311 | argument. */ | |
4312 | ||
4313 | if (TREE_CODE (arg) == IDENTIFIER_NODE | |
4314 | && IDENTIFIER_OPNAME_P (arg)) | |
4315 | { | |
4316 | my_friendly_abort (117); | |
4317 | /* We don't know the type yet, so just work around the problem. | |
4318 | We know that this will resolve to an lvalue. */ | |
4319 | return build1 (ADDR_EXPR, unknown_type_node, arg); | |
4320 | } | |
4321 | ||
4322 | if (TREE_CODE (arg) == TREE_LIST) | |
4323 | { | |
f376e137 MS |
4324 | if (TREE_CODE (TREE_VALUE (arg)) == FUNCTION_DECL |
4325 | && DECL_CHAIN (TREE_VALUE (arg)) == NULL_TREE) | |
4326 | /* Unique overloaded non-member function. */ | |
4327 | return build_unary_op (ADDR_EXPR, TREE_VALUE (arg), 0); | |
8d08fdba MS |
4328 | if (TREE_CHAIN (arg) == NULL_TREE |
4329 | && TREE_CODE (TREE_VALUE (arg)) == TREE_LIST | |
4330 | && DECL_CHAIN (TREE_VALUE (TREE_VALUE (arg))) == NULL_TREE) | |
f376e137 MS |
4331 | /* Unique overloaded member function. */ |
4332 | return build_unary_op (ADDR_EXPR, TREE_VALUE (TREE_VALUE (arg)), | |
4333 | 0); | |
8d08fdba MS |
4334 | return build1 (ADDR_EXPR, unknown_type_node, arg); |
4335 | } | |
4336 | ||
4337 | /* Handle complex lvalues (when permitted) | |
4338 | by reduction to simpler cases. */ | |
4339 | val = unary_complex_lvalue (code, arg); | |
4340 | if (val != 0) | |
4341 | return val; | |
4342 | ||
8d08fdba MS |
4343 | switch (TREE_CODE (arg)) |
4344 | { | |
4345 | case NOP_EXPR: | |
4346 | case CONVERT_EXPR: | |
4347 | case FLOAT_EXPR: | |
4348 | case FIX_TRUNC_EXPR: | |
4349 | case FIX_FLOOR_EXPR: | |
4350 | case FIX_ROUND_EXPR: | |
4351 | case FIX_CEIL_EXPR: | |
f0e01782 MS |
4352 | if (! lvalue_p (arg) && pedantic) |
4353 | pedwarn ("taking the address of a cast to non-reference type"); | |
8d08fdba | 4354 | } |
8d08fdba MS |
4355 | |
4356 | /* Allow the address of a constructor if all the elements | |
4357 | are constant. */ | |
4358 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
4359 | ; | |
4360 | /* Anything not already handled and not a true memory reference | |
4361 | is an error. */ | |
b7484fbe MS |
4362 | else if (TREE_CODE (argtype) != FUNCTION_TYPE |
4363 | && TREE_CODE (argtype) != METHOD_TYPE | |
8d08fdba MS |
4364 | && !lvalue_or_else (arg, "unary `&'")) |
4365 | return error_mark_node; | |
4366 | ||
4367 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
8d08fdba MS |
4368 | /* If the lvalue is const or volatile, |
4369 | merge that into the type that the address will point to. */ | |
4370 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
4371 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
4372 | { | |
4373 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
f376e137 | 4374 | argtype = cp_build_type_variant (argtype, |
21474714 MS |
4375 | TREE_READONLY (arg), |
4376 | TREE_THIS_VOLATILE (arg)); | |
8d08fdba MS |
4377 | } |
4378 | ||
4379 | argtype = build_pointer_type (argtype); | |
4380 | ||
4381 | if (mark_addressable (arg) == 0) | |
4382 | return error_mark_node; | |
4383 | ||
4384 | { | |
4385 | tree addr; | |
4386 | ||
4387 | if (TREE_CODE (arg) == COMPONENT_REF) | |
4388 | addr = build_component_addr (arg, argtype, | |
4389 | "attempt to take address of bit-field structure member `%s'"); | |
4390 | else | |
4391 | addr = build1 (code, argtype, arg); | |
4392 | ||
4393 | /* Address of a static or external variable or | |
4394 | function counts as a constant */ | |
4395 | if (staticp (arg)) | |
4396 | TREE_CONSTANT (addr) = 1; | |
4ac14744 MS |
4397 | |
4398 | if (TREE_CODE (argtype) == POINTER_TYPE && | |
4399 | TREE_CODE (TREE_TYPE (argtype)) == METHOD_TYPE) | |
4400 | { | |
4401 | build_ptrmemfunc_type (argtype); | |
4402 | addr = build_ptrmemfunc (argtype, addr, 0); | |
4403 | } | |
4404 | ||
8d08fdba MS |
4405 | return addr; |
4406 | } | |
4407 | } | |
4408 | ||
4409 | if (!errstring) | |
4410 | { | |
4411 | if (argtype == 0) | |
4412 | argtype = TREE_TYPE (arg); | |
4413 | return fold (build1 (code, argtype, arg)); | |
4414 | } | |
4415 | ||
4416 | error (errstring); | |
4417 | return error_mark_node; | |
4418 | } | |
4419 | ||
cffa8729 | 4420 | #if 0 |
8d08fdba MS |
4421 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, |
4422 | convert ARG with the same conversions in the same order | |
4423 | and return the result. */ | |
4424 | ||
4425 | static tree | |
4426 | convert_sequence (conversions, arg) | |
4427 | tree conversions; | |
4428 | tree arg; | |
4429 | { | |
4430 | switch (TREE_CODE (conversions)) | |
4431 | { | |
4432 | case NOP_EXPR: | |
4433 | case CONVERT_EXPR: | |
4434 | case FLOAT_EXPR: | |
4435 | case FIX_TRUNC_EXPR: | |
4436 | case FIX_FLOOR_EXPR: | |
4437 | case FIX_ROUND_EXPR: | |
4438 | case FIX_CEIL_EXPR: | |
4439 | return convert (TREE_TYPE (conversions), | |
4440 | convert_sequence (TREE_OPERAND (conversions, 0), | |
4441 | arg)); | |
4442 | ||
4443 | default: | |
4444 | return arg; | |
4445 | } | |
4446 | } | |
cffa8729 | 4447 | #endif |
8d08fdba MS |
4448 | |
4449 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
4450 | for certain kinds of expressions which are not really lvalues | |
4451 | but which we can accept as lvalues. | |
4452 | ||
4453 | If ARG is not a kind of expression we can handle, return zero. */ | |
4454 | ||
4455 | tree | |
4456 | unary_complex_lvalue (code, arg) | |
4457 | enum tree_code code; | |
4458 | tree arg; | |
4459 | { | |
4460 | /* Handle (a, b) used as an "lvalue". */ | |
4461 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
4462 | { | |
4463 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
8d08fdba MS |
4464 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), |
4465 | TREE_OPERAND (arg, 0), real_result); | |
4466 | } | |
4467 | ||
4468 | /* Handle (a ? b : c) used as an "lvalue". */ | |
4469 | if (TREE_CODE (arg) == COND_EXPR) | |
a4443a08 MS |
4470 | return rationalize_conditional_expr (code, arg); |
4471 | ||
e1cd6e56 MS |
4472 | if (TREE_CODE (arg) == MODIFY_EXPR |
4473 | || TREE_CODE (arg) == PREINCREMENT_EXPR | |
4474 | || TREE_CODE (arg) == PREDECREMENT_EXPR) | |
a4443a08 MS |
4475 | return unary_complex_lvalue |
4476 | (code, build (COMPOUND_EXPR, TREE_TYPE (TREE_OPERAND (arg, 0)), | |
4477 | arg, TREE_OPERAND (arg, 0))); | |
8d08fdba MS |
4478 | |
4479 | if (code != ADDR_EXPR) | |
4480 | return 0; | |
4481 | ||
4482 | /* Handle (a = b) used as an "lvalue" for `&'. */ | |
4483 | if (TREE_CODE (arg) == MODIFY_EXPR | |
4484 | || TREE_CODE (arg) == INIT_EXPR) | |
4485 | { | |
4486 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); | |
4487 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result); | |
4488 | } | |
4489 | ||
8d08fdba MS |
4490 | if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE |
4491 | || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE | |
4492 | || TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
4493 | { | |
4494 | /* The representation of something of type OFFSET_TYPE | |
4495 | is really the representation of a pointer to it. | |
4496 | Here give the representation its true type. */ | |
4497 | tree t; | |
4498 | tree offset; | |
4499 | ||
4500 | my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313); | |
4501 | ||
4502 | if (TREE_CODE (arg) != OFFSET_REF) | |
4503 | return 0; | |
4504 | ||
4505 | t = TREE_OPERAND (arg, 1); | |
4506 | ||
4507 | if (TREE_CODE (t) == FUNCTION_DECL) /* Check all this code for right semantics. */ | |
4508 | return build_unary_op (ADDR_EXPR, t, 0); | |
4509 | if (TREE_CODE (t) == VAR_DECL) | |
4510 | return build_unary_op (ADDR_EXPR, t, 0); | |
4511 | else | |
4512 | { | |
8d08fdba MS |
4513 | if (TREE_OPERAND (arg, 0) |
4514 | && (TREE_CODE (TREE_OPERAND (arg, 0)) != NOP_EXPR | |
4515 | || TREE_OPERAND (TREE_OPERAND (arg, 0), 0) != error_mark_node)) | |
8145f082 MS |
4516 | if (TREE_CODE (t) != FIELD_DECL) |
4517 | { | |
4518 | /* Don't know if this should return address to just | |
4519 | _DECL, or actual address resolved in this expression. */ | |
4520 | sorry ("address of bound pointer-to-member expression"); | |
4521 | return error_mark_node; | |
4522 | } | |
8d08fdba | 4523 | |
c91a56d2 | 4524 | /* Add in the offset to the right subobject. */ |
8145f082 MS |
4525 | offset = get_delta_difference (DECL_FIELD_CONTEXT (t), |
4526 | TREE_TYPE (TREE_OPERAND (arg, 0)), | |
4527 | 0); | |
c91a56d2 MS |
4528 | |
4529 | /* Add in the offset to the field. */ | |
8145f082 MS |
4530 | offset = size_binop (PLUS_EXPR, offset, |
4531 | size_binop (EASY_DIV_EXPR, | |
4532 | DECL_FIELD_BITPOS (t), | |
4533 | size_int (BITS_PER_UNIT))); | |
c91a56d2 MS |
4534 | |
4535 | /* We offset all pointer to data memebers by 1 so that we can | |
4536 | distinguish between a null pointer to data member and the first | |
4537 | data member of a structure. */ | |
4538 | offset = size_binop (PLUS_EXPR, offset, size_int (1)); | |
4539 | ||
8145f082 | 4540 | return convert (build_pointer_type (TREE_TYPE (arg)), offset); |
8d08fdba MS |
4541 | } |
4542 | } | |
4543 | ||
c91a56d2 | 4544 | |
8d08fdba MS |
4545 | /* We permit compiler to make function calls returning |
4546 | objects of aggregate type look like lvalues. */ | |
4547 | { | |
4548 | tree targ = arg; | |
4549 | ||
4550 | if (TREE_CODE (targ) == SAVE_EXPR) | |
4551 | targ = TREE_OPERAND (targ, 0); | |
4552 | ||
4553 | if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ))) | |
4554 | { | |
4555 | if (TREE_CODE (arg) == SAVE_EXPR) | |
4556 | targ = arg; | |
4557 | else | |
5566b478 | 4558 | targ = build_cplus_new (TREE_TYPE (arg), arg); |
f30432d7 | 4559 | return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ); |
8d08fdba MS |
4560 | } |
4561 | ||
4562 | if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) | |
f30432d7 | 4563 | return build (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)), |
8d08fdba | 4564 | TREE_OPERAND (targ, 0), current_function_decl, NULL); |
8d08fdba MS |
4565 | } |
4566 | ||
4567 | /* Don't let anything else be handled specially. */ | |
4568 | return 0; | |
4569 | } | |
8d08fdba MS |
4570 | \f |
4571 | /* Mark EXP saying that we need to be able to take the | |
4572 | address of it; it should not be allocated in a register. | |
4573 | Value is 1 if successful. | |
4574 | ||
4ac14744 | 4575 | C++: we do not allow `current_class_ptr' to be addressable. */ |
8d08fdba MS |
4576 | |
4577 | int | |
4578 | mark_addressable (exp) | |
4579 | tree exp; | |
4580 | { | |
4581 | register tree x = exp; | |
4582 | ||
4583 | if (TREE_ADDRESSABLE (x) == 1) | |
4584 | return 1; | |
4585 | ||
4586 | while (1) | |
4587 | switch (TREE_CODE (x)) | |
4588 | { | |
4589 | case ADDR_EXPR: | |
4590 | case COMPONENT_REF: | |
4591 | case ARRAY_REF: | |
4592 | x = TREE_OPERAND (x, 0); | |
4593 | break; | |
4594 | ||
4595 | case PARM_DECL: | |
4ac14744 | 4596 | if (x == current_class_ptr) |
8d08fdba MS |
4597 | { |
4598 | error ("address of `this' not available"); | |
4599 | TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */ | |
4600 | put_var_into_stack (x); | |
4601 | return 1; | |
4602 | } | |
4603 | case VAR_DECL: | |
cffa8729 | 4604 | if (TREE_STATIC (x) && TREE_READONLY (x) |
8d08fdba | 4605 | && DECL_RTL (x) != 0 |
cffa8729 | 4606 | && ! DECL_IN_MEMORY_P (x)) |
8d08fdba MS |
4607 | { |
4608 | /* We thought this would make a good constant variable, | |
4609 | but we were wrong. */ | |
4610 | push_obstacks_nochange (); | |
4611 | end_temporary_allocation (); | |
4612 | ||
4613 | TREE_ASM_WRITTEN (x) = 0; | |
4614 | DECL_RTL (x) = 0; | |
4615 | rest_of_decl_compilation (x, 0, IDENTIFIER_LOCAL_VALUE (x) == 0, 0); | |
4616 | TREE_ADDRESSABLE (x) = 1; | |
4617 | ||
4618 | pop_obstacks (); | |
4619 | ||
4620 | return 1; | |
4621 | } | |
4622 | /* Caller should not be trying to mark initialized | |
4623 | constant fields addressable. */ | |
4624 | my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0 | |
4625 | || DECL_IN_AGGR_P (x) == 0 | |
4626 | || TREE_STATIC (x) | |
4627 | || DECL_EXTERNAL (x), 314); | |
4628 | ||
4629 | case CONST_DECL: | |
4630 | case RESULT_DECL: | |
4631 | /* For C++, we don't warn about taking the address of a register | |
4632 | variable for CONST_DECLs; ARM p97 explicitly says it's okay. */ | |
4633 | put_var_into_stack (x); | |
4634 | TREE_ADDRESSABLE (x) = 1; | |
4635 | return 1; | |
4636 | ||
4637 | case FUNCTION_DECL: | |
4638 | /* We have to test both conditions here. The first may | |
4639 | be non-zero in the case of processing a default function. | |
4640 | The second may be non-zero in the case of a template function. */ | |
4641 | x = DECL_MAIN_VARIANT (x); | |
faae18ab | 4642 | if ((DECL_THIS_INLINE (x) || DECL_PENDING_INLINE_INFO (x)) |
8d08fdba MS |
4643 | && (DECL_CONTEXT (x) == NULL_TREE |
4644 | || TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (x))) != 't' | |
4645 | || ! CLASSTYPE_INTERFACE_ONLY (DECL_CONTEXT (x)))) | |
4646 | { | |
4647 | mark_inline_for_output (x); | |
4648 | if (x == current_function_decl) | |
4649 | DECL_EXTERNAL (x) = 0; | |
4650 | } | |
4651 | TREE_ADDRESSABLE (x) = 1; | |
4652 | TREE_USED (x) = 1; | |
4653 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
4654 | return 1; | |
4655 | ||
4656 | default: | |
4657 | return 1; | |
4658 | } | |
4659 | } | |
4660 | \f | |
4661 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
4662 | ||
4663 | tree | |
4664 | build_x_conditional_expr (ifexp, op1, op2) | |
4665 | tree ifexp, op1, op2; | |
4666 | { | |
4667 | tree rval = NULL_TREE; | |
4668 | ||
5566b478 MS |
4669 | if (current_template_parms) |
4670 | return build_min_nt (COND_EXPR, ifexp, op1, op2); | |
4671 | ||
8d08fdba MS |
4672 | /* See comments in `build_x_binary_op'. */ |
4673 | if (op1 != 0) | |
4674 | rval = build_opfncall (COND_EXPR, LOOKUP_SPECULATIVELY, ifexp, op1, op2); | |
4675 | if (rval) | |
4676 | return build_opfncall (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); | |
4677 | ||
4678 | return build_conditional_expr (ifexp, op1, op2); | |
4679 | } | |
4680 | ||
4681 | tree | |
4682 | build_conditional_expr (ifexp, op1, op2) | |
4683 | tree ifexp, op1, op2; | |
4684 | { | |
4685 | register tree type1; | |
4686 | register tree type2; | |
4687 | register enum tree_code code1; | |
4688 | register enum tree_code code2; | |
4689 | register tree result_type = NULL_TREE; | |
4690 | tree orig_op1 = op1, orig_op2 = op2; | |
4691 | ||
4692 | /* If second operand is omitted, it is the same as the first one; | |
4693 | make sure it is calculated only once. */ | |
4694 | if (op1 == 0) | |
4695 | { | |
4696 | if (pedantic) | |
4697 | pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression"); | |
4698 | ifexp = op1 = save_expr (ifexp); | |
4699 | } | |
4700 | ||
1743ca29 | 4701 | ifexp = convert (boolean_type_node, ifexp); |
8d08fdba MS |
4702 | |
4703 | if (TREE_CODE (ifexp) == ERROR_MARK) | |
4704 | return error_mark_node; | |
4705 | ||
4706 | op1 = require_instantiated_type (TREE_TYPE (op2), op1, error_mark_node); | |
4707 | if (op1 == error_mark_node) | |
4708 | return error_mark_node; | |
4709 | op2 = require_instantiated_type (TREE_TYPE (op1), op2, error_mark_node); | |
4710 | if (op2 == error_mark_node) | |
4711 | return error_mark_node; | |
4712 | ||
4713 | /* C++: REFERENCE_TYPES must be dereferenced. */ | |
4714 | type1 = TREE_TYPE (op1); | |
4715 | code1 = TREE_CODE (type1); | |
4716 | type2 = TREE_TYPE (op2); | |
4717 | code2 = TREE_CODE (type2); | |
4718 | ||
4719 | if (code1 == REFERENCE_TYPE) | |
4720 | { | |
4721 | op1 = convert_from_reference (op1); | |
4722 | type1 = TREE_TYPE (op1); | |
4723 | code1 = TREE_CODE (type1); | |
4724 | } | |
4725 | if (code2 == REFERENCE_TYPE) | |
4726 | { | |
4727 | op2 = convert_from_reference (op2); | |
4728 | type2 = TREE_TYPE (op2); | |
4729 | code2 = TREE_CODE (type2); | |
4730 | } | |
4731 | ||
8d08fdba MS |
4732 | /* Don't promote the operands separately if they promote |
4733 | the same way. Return the unpromoted type and let the combined | |
4734 | value get promoted if necessary. */ | |
4735 | ||
4736 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2) | |
4737 | && code2 != ARRAY_TYPE | |
8d08fdba MS |
4738 | && code2 != FUNCTION_TYPE |
4739 | && code2 != METHOD_TYPE) | |
4740 | { | |
4741 | tree result; | |
4742 | ||
4743 | if (TREE_CONSTANT (ifexp) | |
4744 | && (TREE_CODE (ifexp) == INTEGER_CST | |
4745 | || TREE_CODE (ifexp) == ADDR_EXPR)) | |
4746 | return (integer_zerop (ifexp) ? op2 : op1); | |
4747 | ||
4748 | if (TREE_CODE (op1) == CONST_DECL) | |
4749 | op1 = DECL_INITIAL (op1); | |
4750 | else if (TREE_READONLY_DECL_P (op1)) | |
4751 | op1 = decl_constant_value (op1); | |
4752 | if (TREE_CODE (op2) == CONST_DECL) | |
4753 | op2 = DECL_INITIAL (op2); | |
4754 | else if (TREE_READONLY_DECL_P (op2)) | |
4755 | op2 = decl_constant_value (op2); | |
4756 | if (type1 != type2) | |
f376e137 | 4757 | type1 = cp_build_type_variant |
8d08fdba MS |
4758 | (type1, |
4759 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4760 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4761 | /* ??? This is a kludge to deal with the fact that | |
4762 | we don't sort out integers and enums properly, yet. */ | |
4763 | result = fold (build (COND_EXPR, type1, ifexp, op1, op2)); | |
4764 | if (TREE_TYPE (result) != type1) | |
4765 | result = build1 (NOP_EXPR, type1, result); | |
4766 | return result; | |
4767 | } | |
8d08fdba MS |
4768 | |
4769 | /* They don't match; promote them both and then try to reconcile them. | |
4770 | But don't permit mismatching enum types. */ | |
4771 | if (code1 == ENUMERAL_TYPE) | |
4772 | { | |
4773 | if (code2 == ENUMERAL_TYPE) | |
4774 | { | |
71851aaa | 4775 | cp_error ("enumeral mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
4776 | return error_mark_node; |
4777 | } | |
b19b4a78 MS |
4778 | else if (extra_warnings && ! IS_AGGR_TYPE_CODE (code2) |
4779 | && type2 != type_promotes_to (type1)) | |
8d08fdba MS |
4780 | warning ("enumeral and non-enumeral type in conditional expression"); |
4781 | } | |
4782 | else if (extra_warnings | |
b19b4a78 MS |
4783 | && code2 == ENUMERAL_TYPE && ! IS_AGGR_TYPE_CODE (code1) |
4784 | && type1 != type_promotes_to (type2)) | |
8d08fdba MS |
4785 | warning ("enumeral and non-enumeral type in conditional expression"); |
4786 | ||
4787 | if (code1 != VOID_TYPE) | |
4788 | { | |
4789 | op1 = default_conversion (op1); | |
4790 | type1 = TREE_TYPE (op1); | |
71851aaa MS |
4791 | if (TYPE_PTRMEMFUNC_P (type1)) |
4792 | type1 = TYPE_PTRMEMFUNC_FN_TYPE (type1); | |
8d08fdba MS |
4793 | code1 = TREE_CODE (type1); |
4794 | } | |
4795 | if (code2 != VOID_TYPE) | |
4796 | { | |
4797 | op2 = default_conversion (op2); | |
4798 | type2 = TREE_TYPE (op2); | |
71851aaa MS |
4799 | if (TYPE_PTRMEMFUNC_P (type2)) |
4800 | type2 = TYPE_PTRMEMFUNC_FN_TYPE (type2); | |
8d08fdba MS |
4801 | code2 = TREE_CODE (type2); |
4802 | } | |
4803 | ||
a5894242 MS |
4804 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE |
4805 | && real_lvalue_p (op1) && real_lvalue_p (op2) | |
4806 | && comptypes (type1, type2, -1)) | |
4807 | { | |
4808 | type1 = build_reference_type (type1); | |
4809 | type2 = build_reference_type (type2); | |
4810 | result_type = common_type (type1, type2); | |
4811 | op1 = convert_to_reference (result_type, op1, CONV_IMPLICIT, | |
4812 | LOOKUP_NORMAL, NULL_TREE); | |
4813 | op2 = convert_to_reference (result_type, op2, CONV_IMPLICIT, | |
4814 | LOOKUP_NORMAL, NULL_TREE); | |
4815 | } | |
8d08fdba MS |
4816 | /* Quickly detect the usual case where op1 and op2 have the same type |
4817 | after promotion. */ | |
a5894242 | 4818 | else if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
8d08fdba MS |
4819 | { |
4820 | if (type1 == type2) | |
4821 | result_type = type1; | |
4822 | else | |
f376e137 | 4823 | result_type = cp_build_type_variant |
8d08fdba MS |
4824 | (type1, |
4825 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4826 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4827 | } | |
4828 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) | |
4829 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
4830 | { | |
4831 | result_type = common_type (type1, type2); | |
4832 | } | |
4833 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
4834 | { | |
4835 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
4836 | pedwarn ("ANSI C++ forbids conditional expr with only one void side"); | |
4837 | result_type = void_type_node; | |
4838 | } | |
4839 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) | |
4840 | { | |
4841 | if (comp_target_types (type1, type2, 1)) | |
4842 | result_type = common_type (type1, type2); | |
4843 | else if (integer_zerop (op1) && TREE_TYPE (type1) == void_type_node | |
4844 | && TREE_CODE (orig_op1) != NOP_EXPR) | |
4845 | result_type = qualify_type (type2, type1); | |
4846 | else if (integer_zerop (op2) && TREE_TYPE (type2) == void_type_node | |
4847 | && TREE_CODE (orig_op2) != NOP_EXPR) | |
4848 | result_type = qualify_type (type1, type2); | |
4849 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) | |
4850 | { | |
4851 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
4852 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
4853 | result_type = qualify_type (type1, type2); | |
4854 | } | |
4855 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
4856 | { | |
4857 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
4858 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
4859 | result_type = qualify_type (type2, type1); | |
4860 | } | |
4861 | /* C++ */ | |
4862 | else if (comptypes (type2, type1, 0)) | |
4863 | result_type = type2; | |
4864 | else if (IS_AGGR_TYPE (TREE_TYPE (type1)) | |
4865 | && IS_AGGR_TYPE (TREE_TYPE (type2)) | |
4866 | && (result_type = common_base_type (TREE_TYPE (type1), TREE_TYPE (type2)))) | |
4867 | { | |
4868 | if (result_type == error_mark_node) | |
4869 | { | |
00595019 MS |
4870 | cp_error ("common base type of types `%T' and `%T' is ambiguous", |
4871 | TREE_TYPE (type1), TREE_TYPE (type2)); | |
8d08fdba MS |
4872 | result_type = ptr_type_node; |
4873 | } | |
00595019 MS |
4874 | else |
4875 | { | |
4876 | if (pedantic | |
4877 | && result_type != TREE_TYPE (type1) | |
4878 | && result_type != TREE_TYPE (type2)) | |
4879 | cp_pedwarn ("`%T' and `%T' converted to `%T *' in conditional expression", | |
4880 | type1, type2, result_type); | |
4881 | ||
f30432d7 | 4882 | result_type = build_pointer_type (result_type); |
00595019 | 4883 | } |
8d08fdba MS |
4884 | } |
4885 | else | |
4886 | { | |
4887 | pedwarn ("pointer type mismatch in conditional expression"); | |
4888 | result_type = ptr_type_node; | |
4889 | } | |
4890 | } | |
4891 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
4892 | { | |
4893 | if (!integer_zerop (op2)) | |
7177d104 | 4894 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba | 4895 | else |
9e9ff709 MS |
4896 | op2 = null_pointer_node; |
4897 | ||
8d08fdba MS |
4898 | result_type = type1; |
4899 | } | |
4900 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
4901 | { | |
4902 | if (!integer_zerop (op1)) | |
7177d104 | 4903 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba | 4904 | else |
9e9ff709 MS |
4905 | op1 = null_pointer_node; |
4906 | ||
8d08fdba | 4907 | result_type = type2; |
8d08fdba MS |
4908 | } |
4909 | ||
4910 | if (!result_type) | |
4911 | { | |
4912 | /* The match does not look good. If either is | |
4913 | an aggregate value, try converting to a scalar type. */ | |
4914 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE) | |
4915 | { | |
71851aaa | 4916 | cp_error ("aggregate mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
4917 | return error_mark_node; |
4918 | } | |
fc378698 MS |
4919 | /* Warning: this code assumes that conversion between cv-variants of |
4920 | a type is done using NOP_EXPRs. */ | |
8d08fdba MS |
4921 | if (code1 == RECORD_TYPE && TYPE_HAS_CONVERSION (type1)) |
4922 | { | |
fc378698 MS |
4923 | tree tmp = build_pointer_type |
4924 | (build_type_variant (TREE_TYPE (type2), 1, 1)); | |
4925 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op1, 0); | |
8d08fdba MS |
4926 | if (tmp == NULL_TREE) |
4927 | { | |
fc378698 MS |
4928 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
4929 | type1, type2); | |
8d08fdba MS |
4930 | return error_mark_node; |
4931 | } | |
4932 | if (tmp == error_mark_node) | |
4933 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
4934 | else |
4935 | STRIP_NOPS (tmp); | |
4936 | result_type = common_type (type1, TREE_TYPE (tmp)); | |
8d08fdba MS |
4937 | op1 = tmp; |
4938 | } | |
4939 | else if (code2 == RECORD_TYPE && TYPE_HAS_CONVERSION (type2)) | |
4940 | { | |
fc378698 MS |
4941 | tree tmp = build_pointer_type |
4942 | (build_type_variant (TREE_TYPE (type1), 1, 1)); | |
4943 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op2, 0); | |
8d08fdba MS |
4944 | if (tmp == NULL_TREE) |
4945 | { | |
fc378698 MS |
4946 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
4947 | type1, type2); | |
8d08fdba MS |
4948 | return error_mark_node; |
4949 | } | |
4950 | if (tmp == error_mark_node) | |
4951 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
4952 | else |
4953 | STRIP_NOPS (tmp); | |
4954 | result_type = common_type (type1, TREE_TYPE (tmp)); | |
8d08fdba MS |
4955 | op2 = tmp; |
4956 | } | |
4957 | else if (flag_cond_mismatch) | |
4958 | result_type = void_type_node; | |
4959 | else | |
4960 | { | |
4961 | error ("type mismatch in conditional expression"); | |
4962 | return error_mark_node; | |
4963 | } | |
4964 | } | |
4965 | ||
79ff2c6c MS |
4966 | if (TREE_CODE (result_type) == POINTER_TYPE |
4967 | && TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
4968 | result_type = build_ptrmemfunc_type (result_type); | |
4969 | ||
8d08fdba MS |
4970 | if (result_type != TREE_TYPE (op1)) |
4971 | op1 = convert_and_check (result_type, op1); | |
4972 | if (result_type != TREE_TYPE (op2)) | |
4973 | op2 = convert_and_check (result_type, op2); | |
4974 | ||
8d08fdba MS |
4975 | if (TREE_CONSTANT (ifexp)) |
4976 | return integer_zerop (ifexp) ? op2 : op1; | |
4977 | ||
a5894242 MS |
4978 | return convert_from_reference |
4979 | (fold (build (COND_EXPR, result_type, ifexp, op1, op2))); | |
8d08fdba MS |
4980 | } |
4981 | \f | |
4982 | /* Handle overloading of the ',' operator when needed. Otherwise, | |
4983 | this function just builds an expression list. */ | |
4984 | tree | |
4985 | build_x_compound_expr (list) | |
4986 | tree list; | |
4987 | { | |
4988 | tree rest = TREE_CHAIN (list); | |
4989 | tree result; | |
4990 | ||
5566b478 MS |
4991 | if (current_template_parms) |
4992 | return build_min_nt (COMPOUND_EXPR, list, NULL_TREE); | |
4993 | ||
8d08fdba MS |
4994 | if (rest == NULL_TREE) |
4995 | return build_compound_expr (list); | |
4996 | ||
4997 | result = build_opfncall (COMPOUND_EXPR, LOOKUP_NORMAL, | |
4998 | TREE_VALUE (list), TREE_VALUE (rest), NULL_TREE); | |
4999 | if (result) | |
5000 | return build_x_compound_expr (tree_cons (NULL_TREE, result, TREE_CHAIN (rest))); | |
b19b4a78 MS |
5001 | |
5002 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) | |
5003 | { | |
5004 | /* the left-hand operand of a comma expression is like an expression | |
5005 | statement: we should warn if it doesn't have any side-effects, | |
5006 | unless it was explicitly cast to (void). */ | |
5007 | if ((extra_warnings || warn_unused) | |
5008 | && !(TREE_CODE (TREE_VALUE(list)) == CONVERT_EXPR | |
5009 | && TREE_TYPE (TREE_VALUE(list)) == void_type_node)) | |
5010 | warning("left-hand operand of comma expression has no effect"); | |
5011 | } | |
5012 | #if 0 /* this requires a gcc backend patch to export warn_if_unused_value */ | |
5013 | else if (warn_unused) | |
5014 | warn_if_unused_value (TREE_VALUE(list)); | |
5015 | #endif | |
5016 | ||
8d08fdba MS |
5017 | return build_compound_expr (tree_cons (NULL_TREE, TREE_VALUE (list), |
5018 | build_tree_list (NULL_TREE, build_x_compound_expr (rest)))); | |
5019 | } | |
5020 | ||
5021 | /* Given a list of expressions, return a compound expression | |
5022 | that performs them all and returns the value of the last of them. */ | |
5023 | ||
5024 | tree | |
5025 | build_compound_expr (list) | |
5026 | tree list; | |
5027 | { | |
5028 | register tree rest; | |
5029 | ||
5030 | if (TREE_READONLY_DECL_P (TREE_VALUE (list))) | |
5031 | TREE_VALUE (list) = decl_constant_value (TREE_VALUE (list)); | |
5032 | ||
5033 | if (TREE_CHAIN (list) == 0) | |
5034 | { | |
5035 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5036 | Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */ | |
5037 | if (TREE_CODE (list) == NOP_EXPR | |
5038 | && TREE_TYPE (list) == TREE_TYPE (TREE_OPERAND (list, 0))) | |
5039 | list = TREE_OPERAND (list, 0); | |
5040 | ||
5041 | /* Convert arrays to pointers. */ | |
5042 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (list))) == ARRAY_TYPE) | |
5043 | return default_conversion (TREE_VALUE (list)); | |
5044 | else | |
5045 | return TREE_VALUE (list); | |
5046 | } | |
5047 | ||
5048 | rest = build_compound_expr (TREE_CHAIN (list)); | |
5049 | ||
b19b4a78 MS |
5050 | /* When pedantic, a compound expression cannot be a constant expression. */ |
5051 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) | |
5052 | return rest; | |
8d08fdba MS |
5053 | |
5054 | return build (COMPOUND_EXPR, TREE_TYPE (rest), | |
5055 | break_out_cleanups (TREE_VALUE (list)), rest); | |
5056 | } | |
5057 | ||
cdf5b885 MS |
5058 | tree |
5059 | build_static_cast (type, expr) | |
a4443a08 MS |
5060 | tree type, expr; |
5061 | { | |
6060a796 | 5062 | return build_c_cast (type, expr, 0); |
a4443a08 MS |
5063 | } |
5064 | ||
cdf5b885 MS |
5065 | tree |
5066 | build_reinterpret_cast (type, expr) | |
a4443a08 MS |
5067 | tree type, expr; |
5068 | { | |
8ccc31eb MS |
5069 | tree intype = TREE_TYPE (expr); |
5070 | ||
5566b478 MS |
5071 | if (current_template_parms) |
5072 | { | |
5073 | tree t = build_min (REINTERPRET_CAST_EXPR, type, expr); | |
5074 | return t; | |
5075 | } | |
5076 | ||
a80e4195 MS |
5077 | if (TYPE_PTRMEMFUNC_P (type)) |
5078 | if (TYPE_PTRMEMFUNC_P (intype)) | |
5079 | return build1 (NOP_EXPR, type, expr); | |
5080 | ||
5081 | if (TYPE_PTRMEMFUNC_P (type)) | |
5082 | type = TYPE_PTRMEMFUNC_FN_TYPE (type); | |
5083 | ||
8ccc31eb MS |
5084 | if (TYPE_PTRMEMFUNC_P (intype)) |
5085 | intype = TYPE_PTRMEMFUNC_FN_TYPE (intype); | |
5086 | ||
5087 | if (! POINTER_TYPE_P (type) && ! TREE_CODE (type) == INTEGER_TYPE) | |
5088 | { | |
5089 | cp_error ("reinterpret_cast cannot convert to type `%T'", type); | |
5090 | return error_mark_node; | |
5091 | } | |
5092 | if (! POINTER_TYPE_P (intype) && ! TREE_CODE (intype) == INTEGER_TYPE) | |
5093 | { | |
5094 | cp_error ("reinterpret_cast cannot convert from type `%T'", type); | |
5095 | return error_mark_node; | |
5096 | } | |
5097 | if (TREE_CODE (type) == INTEGER_TYPE && TREE_CODE (intype) != POINTER_TYPE) | |
5098 | { | |
5099 | cp_error ("reinterpret_cast cannot convert non-pointer type `%T' to `%T'", | |
5100 | intype, type); | |
5101 | return error_mark_node; | |
5102 | } | |
5103 | if (TREE_CODE (intype) == INTEGER_TYPE && TREE_CODE (type) != POINTER_TYPE) | |
5104 | { | |
5105 | cp_error ("reinterpret_cast cannot convert `%T' to non-pointer type `%T'", | |
5106 | intype, type); | |
5107 | return error_mark_node; | |
5108 | } | |
5109 | ||
5110 | if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (intype) == POINTER_TYPE) | |
5111 | expr = convert (ptr_type_node, expr); | |
5112 | ||
6060a796 | 5113 | return build_c_cast (type, expr, 0); |
a4443a08 MS |
5114 | } |
5115 | ||
cdf5b885 MS |
5116 | tree |
5117 | build_const_cast (type, expr) | |
a4443a08 MS |
5118 | tree type, expr; |
5119 | { | |
8ccc31eb MS |
5120 | tree intype = TREE_TYPE (expr); |
5121 | tree t1, t2; | |
5122 | ||
f30432d7 MS |
5123 | if (type == error_mark_node || expr == error_mark_node) |
5124 | return error_mark_node; | |
5125 | ||
8ccc31eb MS |
5126 | if (TYPE_PTRMEMFUNC_P (type)) |
5127 | type = TYPE_PTRMEMFUNC_FN_TYPE (type); | |
5128 | if (TYPE_PTRMEMFUNC_P (intype)) | |
5129 | intype = TYPE_PTRMEMFUNC_FN_TYPE (intype); | |
5130 | ||
5131 | if (! POINTER_TYPE_P (type)) | |
5132 | { | |
5133 | cp_error ("const_cast cannot convert to non-pointer type `%T'", type); | |
5134 | return error_mark_node; | |
5135 | } | |
5136 | if (TREE_CODE (type) == REFERENCE_TYPE && ! real_lvalue_p (expr)) | |
5137 | { | |
5138 | cp_error ("const_cast cannot convert rvalue to type `%T'", type); | |
5139 | return error_mark_node; | |
5140 | } | |
5141 | if (TREE_CODE (type) == POINTER_TYPE && TREE_CODE (intype) != POINTER_TYPE) | |
5142 | { | |
5143 | cp_error ("const_cast cannot convert non-pointer type `%T' to type `%T'", | |
5144 | intype, type); | |
5145 | return error_mark_node; | |
5146 | } | |
5147 | ||
5148 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
5149 | { | |
5150 | t1 = TREE_TYPE (type); | |
5151 | t2 = intype; | |
5152 | } | |
5153 | else | |
5154 | { | |
5155 | t1 = TREE_TYPE (type); | |
5156 | t2 = TREE_TYPE (intype); | |
5157 | ||
5158 | for (; TREE_CODE (t1) == POINTER_TYPE && TREE_CODE (t2) == POINTER_TYPE; | |
5159 | t1 = TREE_TYPE (t1), t2 = TREE_TYPE (t2)) | |
5160 | ; | |
5161 | } | |
5162 | ||
5163 | if (TREE_CODE (t1) == OFFSET_TYPE && TREE_CODE (t2) == OFFSET_TYPE) | |
5164 | { | |
5165 | if (TYPE_OFFSET_BASETYPE (t1) != TYPE_OFFSET_BASETYPE (t2)) | |
5166 | { | |
5167 | cp_error ("const_cast cannot convert between pointers to members of different types `%T' and `%T'", | |
5168 | TYPE_OFFSET_BASETYPE (t2), TYPE_OFFSET_BASETYPE (t1)); | |
5169 | return error_mark_node; | |
5170 | } | |
5171 | t1 = TREE_TYPE (t1); | |
5172 | t2 = TREE_TYPE (t2); | |
5173 | } | |
5174 | ||
5175 | if (TYPE_MAIN_VARIANT (t1) != TYPE_MAIN_VARIANT (t2)) | |
5176 | { | |
5177 | cp_error ("const_cast cannot convert unrelated type `%T' to `%T'", | |
5178 | t2, t1); | |
5179 | return error_mark_node; | |
5180 | } | |
5181 | ||
6060a796 | 5182 | return build_c_cast (type, expr, 0); |
a4443a08 MS |
5183 | } |
5184 | ||
6060a796 MS |
5185 | /* Build an expression representing a cast to type TYPE of expression EXPR. |
5186 | ||
5187 | ALLOW_NONCONVERTING is true if we should allow non-converting constructors | |
5188 | when doing the cast. */ | |
8d08fdba MS |
5189 | |
5190 | tree | |
6060a796 | 5191 | build_c_cast (type, expr, allow_nonconverting) |
8d08fdba MS |
5192 | register tree type; |
5193 | tree expr; | |
6060a796 | 5194 | int allow_nonconverting; |
8d08fdba MS |
5195 | { |
5196 | register tree value = expr; | |
5197 | ||
5198 | if (type == error_mark_node || expr == error_mark_node) | |
5199 | return error_mark_node; | |
5200 | ||
5201 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
8ccc31eb MS |
5202 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
5203 | if (TREE_CODE (type) != REFERENCE_TYPE | |
5204 | && TREE_CODE (value) == NOP_EXPR | |
8d08fdba MS |
5205 | && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) |
5206 | value = TREE_OPERAND (value, 0); | |
5207 | ||
5208 | if (TREE_TYPE (expr) | |
5209 | && TREE_CODE (TREE_TYPE (expr)) == OFFSET_TYPE | |
5210 | && TREE_CODE (type) != OFFSET_TYPE) | |
5211 | value = resolve_offset_ref (value); | |
5212 | ||
5213 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5214 | { | |
5215 | /* Allow casting from T1* to T2[] because Cfront allows it. | |
5216 | NIHCL uses it. It is not valid ANSI C however, and hence, not | |
5217 | valid ANSI C++. */ | |
5218 | if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) | |
5219 | { | |
5220 | if (pedantic) | |
5221 | pedwarn ("ANSI C++ forbids casting to an array type"); | |
5222 | type = build_pointer_type (TREE_TYPE (type)); | |
5223 | } | |
5224 | else | |
5225 | { | |
5226 | error ("ANSI C++ forbids casting to an array type"); | |
5227 | return error_mark_node; | |
5228 | } | |
5229 | } | |
5230 | ||
a0a33927 MS |
5231 | if (TREE_CODE (type) == FUNCTION_TYPE |
5232 | || TREE_CODE (type) == METHOD_TYPE) | |
5233 | { | |
5234 | cp_error ("casting to function type `%T'", type); | |
5235 | return error_mark_node; | |
5236 | } | |
5237 | ||
8d08fdba MS |
5238 | if (IS_SIGNATURE (type)) |
5239 | { | |
5240 | error ("cast specifies signature type"); | |
5241 | return error_mark_node; | |
5242 | } | |
5243 | ||
5566b478 MS |
5244 | if (current_template_parms) |
5245 | { | |
5246 | tree t = build_min (CAST_EXPR, type, | |
5247 | min_tree_cons (NULL_TREE, value, NULL_TREE)); | |
5248 | return t; | |
5249 | } | |
5250 | ||
39211cd5 | 5251 | if (TREE_CODE (type) == VOID_TYPE) |
a292b002 | 5252 | value = build1 (CONVERT_EXPR, type, value); |
39211cd5 | 5253 | else if (TREE_TYPE (value) == NULL_TREE |
8d08fdba MS |
5254 | || type_unknown_p (value)) |
5255 | { | |
5256 | value = instantiate_type (type, value, 1); | |
5257 | /* Did we lose? */ | |
5258 | if (value == error_mark_node) | |
5259 | return error_mark_node; | |
5260 | } | |
5261 | else | |
5262 | { | |
8ccc31eb MS |
5263 | tree otype; |
5264 | int flag; | |
8d08fdba MS |
5265 | |
5266 | /* Convert functions and arrays to pointers and | |
5267 | convert references to their expanded types, | |
5268 | but don't convert any other types. */ | |
5269 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
5270 | || TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE | |
5271 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
5272 | || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE) | |
5273 | value = default_conversion (value); | |
5274 | otype = TREE_TYPE (value); | |
5275 | ||
5276 | /* Optionally warn about potentially worrisome casts. */ | |
5277 | ||
5278 | if (warn_cast_qual | |
5279 | && TREE_CODE (type) == POINTER_TYPE | |
5280 | && TREE_CODE (otype) == POINTER_TYPE) | |
5281 | { | |
5282 | /* For C++ we make these regular warnings, rather than | |
5283 | softening them into pedwarns. */ | |
5284 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
5285 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
5286 | warning ("cast discards `volatile' from pointer target type"); | |
5287 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
5288 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
5289 | warning ("cast discards `const' from pointer target type"); | |
5290 | } | |
5291 | ||
5292 | /* Warn about possible alignment problems. */ | |
5293 | if (STRICT_ALIGNMENT && warn_cast_align | |
5294 | && TREE_CODE (type) == POINTER_TYPE | |
5295 | && TREE_CODE (otype) == POINTER_TYPE | |
5296 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
5297 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
5298 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
5299 | warning ("cast increases required alignment of target type"); | |
5300 | ||
5301 | #if 0 | |
9e9ff709 MS |
5302 | /* We should see about re-enabling these, they seem useful to |
5303 | me. */ | |
8d08fdba MS |
5304 | if (TREE_CODE (type) == INTEGER_TYPE |
5305 | && TREE_CODE (otype) == POINTER_TYPE | |
5306 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) | |
5307 | warning ("cast from pointer to integer of different size"); | |
5308 | ||
5309 | if (TREE_CODE (type) == POINTER_TYPE | |
5310 | && TREE_CODE (otype) == INTEGER_TYPE | |
5311 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
5312 | /* Don't warn about converting 0 to pointer, | |
5313 | provided the 0 was explicit--not cast or made by folding. */ | |
5314 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))) | |
5315 | warning ("cast to pointer from integer of different size"); | |
5316 | #endif | |
5317 | ||
8ccc31eb | 5318 | flag = allow_nonconverting ? CONV_NONCONVERTING : 0; |
f376e137 | 5319 | |
8ccc31eb MS |
5320 | if (TREE_CODE (type) == REFERENCE_TYPE) |
5321 | value = (convert_from_reference | |
5322 | (convert_to_reference (type, value, CONV_OLD_CONVERT|flag, | |
5323 | LOOKUP_COMPLAIN, NULL_TREE))); | |
5324 | else | |
8d08fdba | 5325 | { |
8ccc31eb MS |
5326 | tree ovalue; |
5327 | ||
5328 | if (TREE_READONLY_DECL_P (value)) | |
5329 | value = decl_constant_value (value); | |
5330 | ||
5331 | ovalue = value; | |
5332 | value = convert_force (type, value, flag); | |
5333 | ||
5334 | /* Ignore any integer overflow caused by the cast. */ | |
5335 | if (TREE_CODE (value) == INTEGER_CST) | |
5336 | { | |
5337 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
5338 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
5339 | } | |
8d08fdba MS |
5340 | } |
5341 | } | |
5342 | ||
5343 | /* Always produce some operator for an explicit cast, | |
5344 | so we can tell (for -pedantic) that the cast is no lvalue. | |
5345 | Also, pedantically, don't let (void *) (FOO *) 0 be a null | |
5346 | pointer constant. */ | |
1743ca29 RK |
5347 | if (TREE_CODE (type) != REFERENCE_TYPE |
5348 | && (value == expr | |
5349 | || (pedantic | |
5350 | && TREE_CODE (value) == INTEGER_CST | |
5351 | && TREE_CODE (expr) == INTEGER_CST | |
5352 | && TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE))) | |
8ccc31eb | 5353 | value = non_lvalue (value); |
8d08fdba MS |
5354 | |
5355 | return value; | |
5356 | } | |
5357 | \f | |
e8abc66f MS |
5358 | tree |
5359 | expand_target_expr (t) | |
5360 | tree t; | |
5361 | { | |
72b7eeff MS |
5362 | extern int temp_slot_level; |
5363 | extern int target_temp_slot_level; | |
5364 | int old_temp_level = target_temp_slot_level; | |
5365 | ||
e8abc66f MS |
5366 | tree xval = make_node (RTL_EXPR); |
5367 | rtx rtxval; | |
5368 | ||
72b7eeff MS |
5369 | /* Any TARGET_EXPR temps live only as long as the outer temp level. |
5370 | Since they are preserved in this new inner level, we know they | |
5371 | will make it into the outer level. */ | |
5372 | push_temp_slots (); | |
5373 | target_temp_slot_level = temp_slot_level; | |
5374 | ||
e8abc66f MS |
5375 | do_pending_stack_adjust (); |
5376 | start_sequence_for_rtl_expr (xval); | |
5377 | emit_note (0, -1); | |
5378 | rtxval = expand_expr (t, NULL, VOIDmode, 0); | |
5379 | do_pending_stack_adjust (); | |
5380 | TREE_SIDE_EFFECTS (xval) = 1; | |
5381 | RTL_EXPR_SEQUENCE (xval) = get_insns (); | |
5382 | end_sequence (); | |
5383 | RTL_EXPR_RTL (xval) = rtxval; | |
5384 | TREE_TYPE (xval) = TREE_TYPE (t); | |
72b7eeff MS |
5385 | |
5386 | pop_temp_slots (); | |
5387 | target_temp_slot_level = old_temp_level; | |
5388 | ||
e8abc66f MS |
5389 | return xval; |
5390 | } | |
5391 | ||
8d08fdba MS |
5392 | /* Build an assignment expression of lvalue LHS from value RHS. |
5393 | MODIFYCODE is the code for a binary operator that we use | |
5394 | to combine the old value of LHS with RHS to get the new value. | |
5395 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. | |
5396 | ||
5397 | C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. | |
5398 | */ | |
5399 | tree | |
5400 | build_modify_expr (lhs, modifycode, rhs) | |
5401 | tree lhs; | |
5402 | enum tree_code modifycode; | |
5403 | tree rhs; | |
5404 | { | |
5405 | register tree result; | |
5406 | tree newrhs = rhs; | |
5407 | tree lhstype = TREE_TYPE (lhs); | |
5408 | tree olhstype = lhstype; | |
a3203465 | 5409 | tree olhs = lhs; |
8d08fdba | 5410 | |
8d08fdba MS |
5411 | /* Avoid duplicate error messages from operands that had errors. */ |
5412 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
5413 | return error_mark_node; | |
5414 | ||
f376e137 MS |
5415 | /* Types that aren't fully specified cannot be used in assignments. */ |
5416 | lhs = require_complete_type (lhs); | |
5417 | ||
8d08fdba MS |
5418 | newrhs = rhs; |
5419 | ||
5420 | /* Handle assignment to signature pointers/refs. */ | |
5421 | ||
5422 | if (TYPE_LANG_SPECIFIC (lhstype) && | |
5423 | (IS_SIGNATURE_POINTER (lhstype) || IS_SIGNATURE_REFERENCE (lhstype))) | |
5424 | { | |
5425 | return build_signature_pointer_constructor (lhs, rhs); | |
5426 | } | |
5427 | ||
5428 | /* Handle control structure constructs used as "lvalues". */ | |
5429 | ||
5430 | switch (TREE_CODE (lhs)) | |
5431 | { | |
5432 | /* Handle --foo = 5; as these are valid constructs in C++ */ | |
5433 | case PREDECREMENT_EXPR: | |
5434 | case PREINCREMENT_EXPR: | |
5435 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) | |
5436 | lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs), | |
46b02c6d MS |
5437 | stabilize_reference (TREE_OPERAND (lhs, 0)), |
5438 | TREE_OPERAND (lhs, 1)); | |
8d08fdba MS |
5439 | return build (COMPOUND_EXPR, lhstype, |
5440 | lhs, | |
5441 | build_modify_expr (TREE_OPERAND (lhs, 0), | |
5442 | modifycode, rhs)); | |
5443 | ||
5444 | /* Handle (a, b) used as an "lvalue". */ | |
5445 | case COMPOUND_EXPR: | |
8d08fdba MS |
5446 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), |
5447 | modifycode, rhs); | |
5448 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5449 | return error_mark_node; | |
5450 | return build (COMPOUND_EXPR, lhstype, | |
5451 | TREE_OPERAND (lhs, 0), newrhs); | |
5452 | ||
a4443a08 MS |
5453 | case MODIFY_EXPR: |
5454 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs); | |
5455 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5456 | return error_mark_node; | |
5457 | return build (COMPOUND_EXPR, lhstype, lhs, newrhs); | |
5458 | ||
8d08fdba MS |
5459 | /* Handle (a ? b : c) used as an "lvalue". */ |
5460 | case COND_EXPR: | |
8d08fdba MS |
5461 | rhs = save_expr (rhs); |
5462 | { | |
5463 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
5464 | except that the RHS goes through a save-expr | |
5465 | so the code to compute it is only emitted once. */ | |
5466 | tree cond | |
5467 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
eac293a1 | 5468 | build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 1)), |
8d08fdba | 5469 | modifycode, rhs), |
eac293a1 | 5470 | build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 2)), |
8d08fdba MS |
5471 | modifycode, rhs)); |
5472 | if (TREE_CODE (cond) == ERROR_MARK) | |
5473 | return cond; | |
5474 | /* Make sure the code to compute the rhs comes out | |
5475 | before the split. */ | |
5476 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
5477 | /* Case to void to suppress warning | |
5478 | from warn_if_unused_value. */ | |
5479 | convert (void_type_node, rhs), cond); | |
5480 | } | |
5481 | } | |
5482 | ||
a0a33927 MS |
5483 | if (TREE_CODE (lhs) == OFFSET_REF) |
5484 | { | |
5485 | if (TREE_OPERAND (lhs, 0) == NULL_TREE) | |
5486 | { | |
5487 | /* Static class member? */ | |
5488 | tree member = TREE_OPERAND (lhs, 1); | |
5489 | if (TREE_CODE (member) == VAR_DECL) | |
5490 | lhs = member; | |
5491 | else | |
5492 | { | |
5493 | compiler_error ("invalid static class member"); | |
5494 | return error_mark_node; | |
5495 | } | |
5496 | } | |
5497 | else | |
5498 | lhs = resolve_offset_ref (lhs); | |
5499 | ||
5500 | olhstype = lhstype = TREE_TYPE (lhs); | |
5501 | } | |
5502 | ||
5503 | if (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5504 | && modifycode != INIT_EXPR) | |
5505 | { | |
5506 | lhs = convert_from_reference (lhs); | |
5507 | olhstype = lhstype = TREE_TYPE (lhs); | |
5508 | } | |
5509 | ||
8d08fdba MS |
5510 | /* If a binary op has been requested, combine the old LHS value with the RHS |
5511 | producing the value we should actually store into the LHS. */ | |
5512 | ||
5513 | if (modifycode == INIT_EXPR) | |
5514 | { | |
db5ae43f MS |
5515 | if (! IS_AGGR_TYPE (lhstype)) |
5516 | /* Do the default thing */; | |
5517 | else if (! TYPE_HAS_CONSTRUCTOR (lhstype)) | |
1743ca29 RK |
5518 | { |
5519 | cp_error ("`%T' has no constructors", lhstype); | |
5520 | return error_mark_node; | |
5521 | } | |
e8abc66f | 5522 | else if (TYPE_HAS_TRIVIAL_INIT_REF (lhstype) |
db5ae43f MS |
5523 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
5524 | /* Do the default thing */; | |
5525 | else | |
8d08fdba | 5526 | { |
fc378698 | 5527 | result = build_method_call (lhs, ctor_identifier, |
8d08fdba | 5528 | build_tree_list (NULL_TREE, rhs), |
fc378698 | 5529 | TYPE_BINFO (lhstype), LOOKUP_NORMAL); |
8d08fdba MS |
5530 | if (result == NULL_TREE) |
5531 | return error_mark_node; | |
5532 | return result; | |
5533 | } | |
5534 | } | |
5535 | else if (modifycode == NOP_EXPR) | |
5536 | { | |
8d08fdba | 5537 | /* `operator=' is not an inheritable operator. */ |
db5ae43f MS |
5538 | if (! IS_AGGR_TYPE (lhstype)) |
5539 | /* Do the default thing */; | |
5540 | else if (! TYPE_HAS_ASSIGNMENT (lhstype)) | |
1743ca29 RK |
5541 | { |
5542 | cp_error ("`%T' does not define operator=", lhstype); | |
5543 | return error_mark_node; | |
5544 | } | |
e8abc66f | 5545 | else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (lhstype) |
db5ae43f | 5546 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
a5894242 MS |
5547 | { |
5548 | if (warn_synth) | |
5549 | /* If we care about this, do overload resolution. */ | |
5550 | build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, | |
5551 | lhs, rhs, make_node (NOP_EXPR)); | |
5552 | ||
5553 | /* Do the default thing */; | |
5554 | } | |
db5ae43f | 5555 | else |
8d08fdba MS |
5556 | { |
5557 | result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, | |
5558 | lhs, rhs, make_node (NOP_EXPR)); | |
5559 | if (result == NULL_TREE) | |
5560 | return error_mark_node; | |
5561 | return result; | |
5562 | } | |
8d08fdba MS |
5563 | lhstype = olhstype; |
5564 | } | |
5565 | else if (PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE)) | |
5566 | { | |
5567 | /* This case must convert to some sort of lvalue that | |
5568 | can participate in an op= operation. */ | |
5569 | tree lhs_tmp = lhs; | |
5570 | tree rhs_tmp = rhs; | |
5571 | if (build_default_binary_type_conversion (modifycode, &lhs_tmp, &rhs_tmp)) | |
5572 | { | |
5573 | lhs = stabilize_reference (lhs_tmp); | |
45537677 | 5574 | /* Forget it was ever anything else. */ |
8d08fdba MS |
5575 | olhstype = lhstype = TREE_TYPE (lhs); |
5576 | newrhs = build_binary_op (modifycode, lhs, rhs_tmp, 1); | |
5577 | } | |
5578 | else | |
b7484fbe | 5579 | { |
c91a56d2 | 5580 | cp_error ("no match for `%Q(%#T, %#T)'", modifycode, |
b7484fbe MS |
5581 | TREE_TYPE (lhs), TREE_TYPE (rhs)); |
5582 | return error_mark_node; | |
5583 | } | |
8d08fdba MS |
5584 | } |
5585 | else | |
5586 | { | |
5587 | lhs = stabilize_reference (lhs); | |
5588 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
c91a56d2 MS |
5589 | if (newrhs == error_mark_node) |
5590 | { | |
5591 | cp_error (" in evaluation of `%Q(%#T, %#T)'", modifycode, | |
5592 | TREE_TYPE (lhs), TREE_TYPE (rhs)); | |
5593 | return error_mark_node; | |
5594 | } | |
8d08fdba MS |
5595 | } |
5596 | ||
5597 | /* Handle a cast used as an "lvalue". | |
5598 | We have already performed any binary operator using the value as cast. | |
5599 | Now convert the result to the cast type of the lhs, | |
5600 | and then true type of the lhs and store it there; | |
5601 | then convert result back to the cast type to be the value | |
5602 | of the assignment. */ | |
5603 | ||
5604 | switch (TREE_CODE (lhs)) | |
5605 | { | |
5606 | case NOP_EXPR: | |
5607 | case CONVERT_EXPR: | |
5608 | case FLOAT_EXPR: | |
5609 | case FIX_TRUNC_EXPR: | |
5610 | case FIX_FLOOR_EXPR: | |
5611 | case FIX_ROUND_EXPR: | |
5612 | case FIX_CEIL_EXPR: | |
5613 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
5614 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE | |
5615 | || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE | |
5616 | || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE) | |
5617 | newrhs = default_conversion (newrhs); | |
5618 | { | |
5619 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
5620 | tree result; | |
a0a33927 MS |
5621 | if (! lvalue_p (lhs) && pedantic) |
5622 | pedwarn ("cast to non-reference type used as lvalue"); | |
5623 | ||
8d08fdba MS |
5624 | result = build_modify_expr (inner_lhs, NOP_EXPR, |
5625 | convert (TREE_TYPE (inner_lhs), | |
5626 | convert (lhstype, newrhs))); | |
5627 | if (TREE_CODE (result) == ERROR_MARK) | |
5628 | return result; | |
f0e01782 | 5629 | return convert (TREE_TYPE (lhs), result); |
8d08fdba MS |
5630 | } |
5631 | } | |
8d08fdba MS |
5632 | |
5633 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
5634 | Reject anything strange now. */ | |
5635 | ||
5636 | if (!lvalue_or_else (lhs, "assignment")) | |
5637 | return error_mark_node; | |
5638 | ||
5639 | GNU_xref_assign (lhs); | |
5640 | ||
5641 | /* Warn about storing in something that is `const'. */ | |
5642 | /* For C++, don't warn if this is initialization. */ | |
5643 | if (modifycode != INIT_EXPR | |
5644 | /* For assignment to `const' signature pointer/reference fields, | |
5645 | don't warn either, we already printed a better message before. */ | |
5646 | && ! (TREE_CODE (lhs) == COMPONENT_REF | |
5647 | && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs, 0))) | |
5648 | || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs, 0))))) | |
5649 | && (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
5650 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
5651 | || TREE_CODE (lhstype) == UNION_TYPE) | |
5652 | && C_TYPE_FIELDS_READONLY (lhstype)) | |
5653 | || (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5654 | && TYPE_READONLY (TREE_TYPE (lhstype))))) | |
5655 | readonly_error (lhs, "assignment", 0); | |
5656 | ||
5657 | /* If storing into a structure or union member, | |
5658 | it has probably been given type `int'. | |
5659 | Compute the type that would go with | |
5660 | the actual amount of storage the member occupies. */ | |
5661 | ||
5662 | if (TREE_CODE (lhs) == COMPONENT_REF | |
5663 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
5664 | || TREE_CODE (lhstype) == REAL_TYPE | |
5665 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
a0a33927 MS |
5666 | { |
5667 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
5668 | ||
5669 | /* If storing in a field that is in actuality a short or narrower | |
5670 | than one, we must store in the field in its actual type. */ | |
5671 | ||
5672 | if (lhstype != TREE_TYPE (lhs)) | |
5673 | { | |
5674 | lhs = copy_node (lhs); | |
5675 | TREE_TYPE (lhs) = lhstype; | |
5676 | } | |
5677 | } | |
8d08fdba MS |
5678 | |
5679 | /* check to see if there is an assignment to `this' */ | |
4ac14744 | 5680 | if (lhs == current_class_ptr) |
8d08fdba | 5681 | { |
2986ae00 MS |
5682 | if (flag_this_is_variable > 0 |
5683 | && DECL_NAME (current_function_decl) != NULL_TREE | |
8ccc31eb MS |
5684 | && (DECL_NAME (current_function_decl) |
5685 | != constructor_name (current_class_type))) | |
2986ae00 | 5686 | warning ("assignment to `this' not in constructor or destructor"); |
8d08fdba MS |
5687 | current_function_just_assigned_this = 1; |
5688 | } | |
5689 | ||
5690 | /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen | |
5691 | when the type of RHS is not yet known, i.e. its type | |
5692 | is inherited from LHS. */ | |
5693 | rhs = require_instantiated_type (lhstype, newrhs, error_mark_node); | |
5694 | if (rhs == error_mark_node) | |
5695 | return error_mark_node; | |
5696 | newrhs = rhs; | |
5697 | ||
5698 | if (modifycode != INIT_EXPR) | |
5699 | { | |
5700 | /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */ | |
5701 | modifycode = NOP_EXPR; | |
5702 | /* Reference-bashing */ | |
5703 | if (TREE_CODE (lhstype) == REFERENCE_TYPE) | |
5704 | { | |
5705 | tree tmp = convert_from_reference (lhs); | |
5706 | lhstype = TREE_TYPE (tmp); | |
5707 | if (TYPE_SIZE (lhstype) == 0) | |
5708 | { | |
5709 | incomplete_type_error (lhs, lhstype); | |
5710 | return error_mark_node; | |
5711 | } | |
5712 | lhs = tmp; | |
5713 | olhstype = lhstype; | |
5714 | } | |
5715 | if (TREE_CODE (TREE_TYPE (newrhs)) == REFERENCE_TYPE) | |
5716 | { | |
5717 | tree tmp = convert_from_reference (newrhs); | |
5718 | if (TYPE_SIZE (TREE_TYPE (tmp)) == 0) | |
5719 | { | |
5720 | incomplete_type_error (newrhs, TREE_TYPE (tmp)); | |
5721 | return error_mark_node; | |
5722 | } | |
5723 | newrhs = tmp; | |
5724 | } | |
5725 | } | |
5726 | ||
5727 | if (TREE_SIDE_EFFECTS (lhs)) | |
5728 | lhs = stabilize_reference (lhs); | |
5729 | if (TREE_SIDE_EFFECTS (newrhs)) | |
5730 | newrhs = stabilize_reference (newrhs); | |
5731 | ||
8d08fdba MS |
5732 | /* Convert new value to destination type. */ |
5733 | ||
5734 | if (TREE_CODE (lhstype) == ARRAY_TYPE) | |
5735 | { | |
f376e137 MS |
5736 | int from_array; |
5737 | ||
44a8d0b3 MS |
5738 | if (! comptypes (lhstype, TREE_TYPE (rhs), 0)) |
5739 | { | |
5740 | cp_error ("incompatible types in assignment of `%T' to `%T'", | |
5741 | TREE_TYPE (rhs), lhstype); | |
5742 | return error_mark_node; | |
5743 | } | |
5744 | ||
39211cd5 | 5745 | /* Allow array assignment in compiler-generated code. */ |
e1cd6e56 | 5746 | if (pedantic && ! DECL_ARTIFICIAL (current_function_decl)) |
f376e137 | 5747 | pedwarn ("ANSI C++ forbids assignment of arrays"); |
39211cd5 | 5748 | |
8d08fdba MS |
5749 | /* Have to wrap this in RTL_EXPR for two cases: |
5750 | in base or member initialization and if we | |
5751 | are a branch of a ?: operator. Since we | |
5752 | can't easily know the latter, just do it always. */ | |
5753 | ||
5754 | result = make_node (RTL_EXPR); | |
5755 | ||
5756 | TREE_TYPE (result) = void_type_node; | |
5757 | do_pending_stack_adjust (); | |
5758 | start_sequence_for_rtl_expr (result); | |
5759 | ||
5760 | /* As a matter of principle, `start_sequence' should do this. */ | |
5761 | emit_note (0, -1); | |
5762 | ||
f376e137 MS |
5763 | from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE |
5764 | ? 1 + (modifycode != INIT_EXPR): 0; | |
8d08fdba | 5765 | expand_vec_init (lhs, lhs, array_type_nelts (lhstype), newrhs, |
f376e137 | 5766 | from_array); |
8d08fdba MS |
5767 | |
5768 | do_pending_stack_adjust (); | |
5769 | ||
5770 | TREE_SIDE_EFFECTS (result) = 1; | |
5771 | RTL_EXPR_SEQUENCE (result) = get_insns (); | |
5772 | RTL_EXPR_RTL (result) = const0_rtx; | |
5773 | end_sequence (); | |
5774 | return result; | |
5775 | } | |
5776 | ||
5777 | if (modifycode == INIT_EXPR) | |
5778 | { | |
5779 | newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL, | |
5780 | "assignment", NULL_TREE, 0); | |
5781 | if (lhs == DECL_RESULT (current_function_decl)) | |
5782 | { | |
5783 | if (DECL_INITIAL (lhs)) | |
5784 | warning ("return value from function receives multiple initializations"); | |
5785 | DECL_INITIAL (lhs) = newrhs; | |
5786 | } | |
5787 | } | |
5788 | else | |
5789 | { | |
8d08fdba MS |
5790 | /* Avoid warnings on enum bit fields. */ |
5791 | if (TREE_CODE (olhstype) == ENUMERAL_TYPE | |
5792 | && TREE_CODE (lhstype) == INTEGER_TYPE) | |
5793 | { | |
5794 | newrhs = convert_for_assignment (olhstype, newrhs, "assignment", | |
5795 | NULL_TREE, 0); | |
6060a796 | 5796 | newrhs = convert_force (lhstype, newrhs, 0); |
8d08fdba MS |
5797 | } |
5798 | else | |
5799 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
b7484fbe MS |
5800 | NULL_TREE, 0); |
5801 | if (TREE_CODE (newrhs) == CALL_EXPR | |
5802 | && TYPE_NEEDS_CONSTRUCTING (lhstype)) | |
5566b478 | 5803 | newrhs = build_cplus_new (lhstype, newrhs); |
b7484fbe | 5804 | |
e8abc66f | 5805 | /* Can't initialize directly from a TARGET_EXPR, since that would |
07674418 MS |
5806 | cause the lhs to be constructed twice, and possibly result in |
5807 | accidental self-initialization. So we force the TARGET_EXPR to be | |
be99da77 | 5808 | expanded without a target. */ |
b7484fbe | 5809 | if (TREE_CODE (newrhs) == TARGET_EXPR) |
be99da77 MS |
5810 | newrhs = build (COMPOUND_EXPR, TREE_TYPE (newrhs), newrhs, |
5811 | TREE_VALUE (newrhs)); | |
8d08fdba MS |
5812 | } |
5813 | ||
5814 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5815 | return error_mark_node; | |
5816 | ||
5817 | if (TREE_CODE (newrhs) == COND_EXPR) | |
5818 | { | |
5819 | tree lhs1; | |
5820 | tree cond = TREE_OPERAND (newrhs, 0); | |
5821 | ||
5822 | if (TREE_SIDE_EFFECTS (lhs)) | |
5823 | cond = build_compound_expr (tree_cons | |
5824 | (NULL_TREE, lhs, | |
5825 | build_tree_list (NULL_TREE, cond))); | |
5826 | ||
5827 | /* Cannot have two identical lhs on this one tree (result) as preexpand | |
5828 | calls will rip them out and fill in RTL for them, but when the | |
5829 | rtl is generated, the calls will only be in the first side of the | |
5830 | condition, not on both, or before the conditional jump! (mrs) */ | |
5831 | lhs1 = break_out_calls (lhs); | |
5832 | ||
5833 | if (lhs == lhs1) | |
5834 | /* If there's no change, the COND_EXPR behaves like any other rhs. */ | |
5835 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
5836 | lhstype, lhs, newrhs); | |
5837 | else | |
5838 | { | |
5839 | tree result_type = TREE_TYPE (newrhs); | |
5840 | /* We have to convert each arm to the proper type because the | |
5841 | types may have been munged by constant folding. */ | |
5842 | result | |
5843 | = build (COND_EXPR, result_type, cond, | |
5844 | build_modify_expr (lhs, modifycode, | |
5845 | convert (result_type, | |
5846 | TREE_OPERAND (newrhs, 1))), | |
5847 | build_modify_expr (lhs1, modifycode, | |
5848 | convert (result_type, | |
5849 | TREE_OPERAND (newrhs, 2)))); | |
5850 | } | |
5851 | } | |
8d08fdba MS |
5852 | else |
5853 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
5854 | lhstype, lhs, newrhs); | |
2ee887f2 | 5855 | |
8d08fdba MS |
5856 | TREE_SIDE_EFFECTS (result) = 1; |
5857 | ||
5858 | /* If we got the LHS in a different type for storing in, | |
5859 | convert the result back to the nominal type of LHS | |
5860 | so that the value we return always has the same type | |
5861 | as the LHS argument. */ | |
5862 | ||
5863 | if (olhstype == TREE_TYPE (result)) | |
5864 | return result; | |
5865 | /* Avoid warnings converting integral types back into enums | |
5866 | for enum bit fields. */ | |
5867 | if (TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE | |
5868 | && TREE_CODE (olhstype) == ENUMERAL_TYPE) | |
a3203465 MS |
5869 | { |
5870 | result = build (COMPOUND_EXPR, olhstype, result, olhs); | |
5871 | TREE_NO_UNUSED_WARNING (result) = 1; | |
5872 | return result; | |
5873 | } | |
8d08fdba MS |
5874 | return convert_for_assignment (olhstype, result, "assignment", |
5875 | NULL_TREE, 0); | |
5876 | } | |
5877 | ||
5566b478 MS |
5878 | tree |
5879 | build_x_modify_expr (lhs, modifycode, rhs) | |
5880 | tree lhs; | |
5881 | enum tree_code modifycode; | |
5882 | tree rhs; | |
5883 | { | |
5884 | if (current_template_parms) | |
5885 | return build_min_nt (MODOP_EXPR, lhs, | |
4dabb379 | 5886 | build_min_nt (modifycode, NULL_TREE, NULL_TREE), rhs); |
5566b478 MS |
5887 | |
5888 | if (modifycode != NOP_EXPR) | |
5889 | { | |
5890 | tree rval = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, | |
5891 | make_node (modifycode)); | |
5892 | if (rval) | |
5893 | return rval; | |
5894 | } | |
5895 | return build_modify_expr (lhs, modifycode, rhs); | |
5896 | } | |
8d08fdba MS |
5897 | |
5898 | /* Return 0 if EXP is not a valid lvalue in this language | |
5899 | even though `lvalue_or_else' would accept it. */ | |
5900 | ||
5901 | int | |
5902 | language_lvalue_valid (exp) | |
5903 | tree exp; | |
5904 | { | |
5905 | return 1; | |
5906 | } | |
5907 | \f | |
ddd5a7c1 | 5908 | /* Get difference in deltas for different pointer to member function |
abc95ed3 | 5909 | types. Return integer_zero_node, if FROM cannot be converted to a |
51c184be MS |
5910 | TO type. If FORCE is true, then allow reverse conversions as well. */ |
5911 | static tree | |
5912 | get_delta_difference (from, to, force) | |
5913 | tree from, to; | |
8926095f | 5914 | int force; |
51c184be MS |
5915 | { |
5916 | tree delta = integer_zero_node; | |
5917 | tree binfo; | |
5918 | ||
5919 | if (to == from) | |
5920 | return delta; | |
5921 | ||
8926095f MS |
5922 | /* Should get_base_distance here, so we can check if any thing along the |
5923 | path is virtual, and we need to make sure we stay | |
5924 | inside the real binfos when going through virtual bases. | |
5925 | Maybe we should replace virtual bases with | |
5926 | binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */ | |
51c184be MS |
5927 | binfo = get_binfo (from, to, 1); |
5928 | if (binfo == error_mark_node) | |
5929 | { | |
5930 | error (" in pointer to member function conversion"); | |
5931 | return delta; | |
5932 | } | |
5933 | if (binfo == 0) | |
5934 | { | |
5935 | if (!force) | |
5936 | { | |
5937 | error_not_base_type (from, to); | |
5938 | error (" in pointer to member function conversion"); | |
5939 | return delta; | |
5940 | } | |
5941 | binfo = get_binfo (to, from, 1); | |
5942 | if (binfo == error_mark_node) | |
5943 | { | |
5944 | error (" in pointer to member function conversion"); | |
5945 | return delta; | |
5946 | } | |
5947 | if (binfo == 0) | |
5948 | { | |
cdf5b885 | 5949 | cp_error ("cannot convert pointer to member of type %T to unrelated pointer to member of type %T", from, to); |
51c184be MS |
5950 | return delta; |
5951 | } | |
5952 | if (TREE_VIA_VIRTUAL (binfo)) | |
5953 | { | |
4ac14744 MS |
5954 | binfo = binfo_member (BINFO_TYPE (binfo), |
5955 | CLASSTYPE_VBASECLASSES (from)); | |
b7484fbe | 5956 | warning ("pointer to member conversion to virtual base class will only work if you are very careful"); |
51c184be | 5957 | } |
4ac14744 MS |
5958 | delta = BINFO_OFFSET (binfo); |
5959 | delta = convert (ptrdiff_type_node, delta); | |
5960 | ||
e1cd6e56 MS |
5961 | return build_binary_op (MINUS_EXPR, |
5962 | integer_zero_node, | |
4ac14744 | 5963 | delta, 1); |
51c184be MS |
5964 | } |
5965 | if (TREE_VIA_VIRTUAL (binfo)) | |
5966 | { | |
b7484fbe | 5967 | warning ("pointer to member conversion from virtual base class will only work if you are very careful"); |
51c184be MS |
5968 | } |
5969 | return BINFO_OFFSET (binfo); | |
5970 | } | |
5971 | ||
8d08fdba MS |
5972 | /* Build a constructor for a pointer to member function. It can be |
5973 | used to initialize global variables, local variable, or used | |
5974 | as a value in expressions. TYPE is the POINTER to METHOD_TYPE we | |
5975 | want to be. | |
5976 | ||
5977 | If FORCE is non-zero, then force this conversion, even if | |
5978 | we would rather not do it. Usually set when using an explicit | |
51c184be MS |
5979 | cast. |
5980 | ||
5981 | Return error_mark_node, if something goes wrong. */ | |
8d08fdba MS |
5982 | |
5983 | tree | |
5984 | build_ptrmemfunc (type, pfn, force) | |
5985 | tree type, pfn; | |
5986 | int force; | |
5987 | { | |
51c184be | 5988 | tree index = integer_zero_node; |
8d08fdba MS |
5989 | tree delta = integer_zero_node; |
5990 | tree delta2 = integer_zero_node; | |
5991 | tree vfield_offset; | |
5992 | tree npfn; | |
5993 | tree u; | |
5994 | ||
ddd5a7c1 | 5995 | /* Handle multiple conversions of pointer to member functions. */ |
51c184be | 5996 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn))) |
8d08fdba | 5997 | { |
51c184be MS |
5998 | tree ndelta, ndelta2, nindex; |
5999 | /* Is is already the right type? */ | |
51c184be MS |
6000 | if (type == TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) |
6001 | return pfn; | |
51c184be MS |
6002 | |
6003 | if (TREE_CODE (pfn) != CONSTRUCTOR) | |
8d08fdba | 6004 | { |
51c184be | 6005 | tree e1, e2, e3; |
4dabb379 | 6006 | ndelta = convert (ptrdiff_type_node, build_component_ref (pfn, delta_identifier, NULL_TREE, 0)); |
e1cd6e56 | 6007 | ndelta2 = convert (ptrdiff_type_node, DELTA2_FROM_PTRMEMFUNC (pfn)); |
4dabb379 | 6008 | index = build_component_ref (pfn, index_identifier, NULL_TREE, 0); |
51c184be MS |
6009 | delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), |
6010 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6011 | force); | |
e1cd6e56 MS |
6012 | delta = build_binary_op (PLUS_EXPR, delta, ndelta, 1); |
6013 | delta2 = build_binary_op (PLUS_EXPR, ndelta2, delta2, 1); | |
b7484fbe | 6014 | e1 = fold (build (GT_EXPR, boolean_type_node, index, integer_zero_node)); |
51c184be | 6015 | |
4dabb379 MS |
6016 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (delta2_identifier, delta2, NULL_TREE)); |
6017 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (NULL_TREE, delta, | |
6018 | tree_cons (NULL_TREE, index, | |
6019 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
51c184be MS |
6020 | e2 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); |
6021 | ||
6022 | pfn = PFN_FROM_PTRMEMFUNC (pfn); | |
6023 | npfn = build1 (NOP_EXPR, type, pfn); | |
6024 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
6025 | ||
4dabb379 MS |
6026 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (pfn_identifier, npfn, NULL_TREE)); |
6027 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (NULL_TREE, delta, | |
6028 | tree_cons (NULL_TREE, index, | |
6029 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
51c184be MS |
6030 | e3 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); |
6031 | return build_conditional_expr (e1, e2, e3); | |
6032 | } | |
6033 | ||
6034 | ndelta = TREE_VALUE (CONSTRUCTOR_ELTS (pfn)); | |
6035 | nindex = TREE_VALUE (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn))); | |
6036 | npfn = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (CONSTRUCTOR_ELTS (pfn)))); | |
6037 | npfn = TREE_VALUE (CONSTRUCTOR_ELTS (npfn)); | |
6038 | if (integer_zerop (nindex)) | |
6039 | pfn = integer_zero_node; | |
f30432d7 MS |
6040 | else if (integer_zerop (fold (size_binop (PLUS_EXPR, nindex, integer_one_node)))) |
6041 | { | |
6042 | tree e3; | |
6043 | delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), | |
6044 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6045 | force); | |
6046 | delta = build_binary_op (PLUS_EXPR, delta, ndelta, 1); | |
6047 | pfn = build1 (NOP_EXPR, type, npfn); | |
6048 | TREE_CONSTANT (pfn) = TREE_CONSTANT (npfn); | |
6049 | ||
4dabb379 MS |
6050 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (pfn_identifier, pfn, NULL_TREE)); |
6051 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (NULL_TREE, delta, | |
6052 | tree_cons (NULL_TREE, nindex, | |
6053 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
f30432d7 MS |
6054 | e3 = digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); |
6055 | return e3; | |
6056 | } | |
51c184be MS |
6057 | else |
6058 | { | |
f3e9dd4c | 6059 | sorry ("value casting of variable nonnull pointer to member functions not supported"); |
51c184be | 6060 | return error_mark_node; |
8d08fdba | 6061 | } |
8d08fdba | 6062 | } |
51c184be MS |
6063 | |
6064 | /* Handle null pointer to member function conversions. */ | |
6065 | if (integer_zerop (pfn)) | |
6066 | { | |
6060a796 | 6067 | pfn = build_c_cast (type, integer_zero_node, 0); |
4dabb379 MS |
6068 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (pfn_identifier, pfn, NULL_TREE)); |
6069 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (NULL_TREE, integer_zero_node, | |
6070 | tree_cons (NULL_TREE, integer_zero_node, | |
6071 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
51c184be MS |
6072 | return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); |
6073 | } | |
6074 | ||
f376e137 MS |
6075 | if (TREE_CODE (pfn) == TREE_LIST |
6076 | || (TREE_CODE (pfn) == ADDR_EXPR | |
6077 | && TREE_CODE (TREE_OPERAND (pfn, 0)) == TREE_LIST)) | |
a0a33927 MS |
6078 | { |
6079 | pfn = instantiate_type (type, pfn, 1); | |
6080 | if (pfn == error_mark_node) | |
6081 | return error_mark_node; | |
4ac14744 | 6082 | pfn = build_addr_func (pfn); |
a0a33927 MS |
6083 | } |
6084 | ||
51c184be MS |
6085 | /* Allow pointer to member conversions here. */ |
6086 | delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn))), | |
6087 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6088 | force); | |
e1cd6e56 | 6089 | delta2 = build_binary_op (PLUS_EXPR, delta2, delta, 1); |
8d08fdba | 6090 | |
4ac14744 MS |
6091 | #if 0 |
6092 | /* We need to check the argument types to see if they are compatible | |
6093 | (any const or volatile violations. */ | |
6094 | something like this: | |
6095 | comptype (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (type))), | |
6096 | TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (pfn)))), ?); | |
6097 | #endif | |
6098 | ||
8d08fdba MS |
6099 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) != FUNCTION_DECL) |
6100 | warning ("assuming pointer to member function is non-virtual"); | |
6101 | ||
6102 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) == FUNCTION_DECL | |
6103 | && DECL_VINDEX (TREE_OPERAND (pfn, 0))) | |
6104 | { | |
6105 | /* Find the offset to the vfield pointer in the object. */ | |
51c184be MS |
6106 | vfield_offset = get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn, 0)), |
6107 | DECL_CLASS_CONTEXT (TREE_OPERAND (pfn, 0)), | |
6108 | 0); | |
6109 | vfield_offset = get_vfield_offset (vfield_offset); | |
8d08fdba MS |
6110 | delta2 = size_binop (PLUS_EXPR, vfield_offset, delta2); |
6111 | ||
6112 | /* Map everything down one to make room for the null pointer to member. */ | |
6113 | index = size_binop (PLUS_EXPR, | |
6114 | DECL_VINDEX (TREE_OPERAND (pfn, 0)), | |
6115 | integer_one_node); | |
4dabb379 | 6116 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (delta2_identifier, delta2, NULL_TREE)); |
8d08fdba MS |
6117 | } |
6118 | else | |
51c184be | 6119 | { |
e1cd6e56 | 6120 | index = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); |
8d08fdba | 6121 | |
4dabb379 MS |
6122 | if (type == TREE_TYPE (pfn)) |
6123 | { | |
6124 | npfn = pfn; | |
6125 | } | |
6126 | else | |
6127 | { | |
6128 | npfn = build1 (NOP_EXPR, type, pfn); | |
6129 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
6130 | } | |
8d08fdba | 6131 | |
4dabb379 | 6132 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (pfn_identifier, npfn, NULL_TREE)); |
51c184be | 6133 | } |
8d08fdba | 6134 | |
4dabb379 MS |
6135 | u = build_nt (CONSTRUCTOR, NULL_TREE, tree_cons (NULL_TREE, delta, |
6136 | tree_cons (NULL_TREE, index, | |
6137 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
51c184be | 6138 | return digest_init (TYPE_GET_PTRMEMFUNC_TYPE (type), u, (tree*)0); |
8d08fdba MS |
6139 | } |
6140 | ||
6141 | /* Convert value RHS to type TYPE as preparation for an assignment | |
6142 | to an lvalue of type TYPE. | |
6143 | The real work of conversion is done by `convert'. | |
6144 | The purpose of this function is to generate error messages | |
6145 | for assignments that are not allowed in C. | |
6146 | ERRTYPE is a string to use in error messages: | |
6147 | "assignment", "return", etc. | |
6148 | ||
6149 | C++: attempts to allow `convert' to find conversions involving | |
6150 | implicit type conversion between aggregate and scalar types | |
6151 | as per 8.5.6 of C++ manual. Does not randomly dereference | |
6152 | pointers to aggregates! */ | |
6153 | ||
6154 | static tree | |
6155 | convert_for_assignment (type, rhs, errtype, fndecl, parmnum) | |
6156 | tree type, rhs; | |
6157 | char *errtype; | |
6158 | tree fndecl; | |
6159 | int parmnum; | |
6160 | { | |
6161 | register enum tree_code codel = TREE_CODE (type); | |
6162 | register tree rhstype; | |
6163 | register enum tree_code coder = TREE_CODE (TREE_TYPE (rhs)); | |
6164 | ||
6165 | if (coder == UNKNOWN_TYPE) | |
6166 | rhs = instantiate_type (type, rhs, 1); | |
6167 | ||
6168 | if (coder == ERROR_MARK) | |
6169 | return error_mark_node; | |
6170 | ||
6171 | if (codel == OFFSET_TYPE) | |
6172 | { | |
6173 | type = TREE_TYPE (type); | |
6174 | codel = TREE_CODE (type); | |
6175 | } | |
6176 | ||
6177 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
6178 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) | |
6179 | rhs = TREE_OPERAND (rhs, 0); | |
6180 | ||
6181 | if (rhs == error_mark_node) | |
6182 | return error_mark_node; | |
6183 | ||
6184 | if (TREE_VALUE (rhs) == error_mark_node) | |
6185 | return error_mark_node; | |
6186 | ||
6187 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6188 | { | |
6189 | rhs = resolve_offset_ref (rhs); | |
6190 | if (rhs == error_mark_node) | |
6191 | return error_mark_node; | |
6192 | rhstype = TREE_TYPE (rhs); | |
6193 | coder = TREE_CODE (rhstype); | |
6194 | } | |
6195 | ||
6196 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
6197 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE | |
6198 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6199 | rhs = default_conversion (rhs); | |
6200 | else if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
6201 | rhs = convert_from_reference (rhs); | |
6202 | ||
6203 | rhstype = TREE_TYPE (rhs); | |
6204 | coder = TREE_CODE (rhstype); | |
6205 | ||
6206 | /* This should no longer change types on us. */ | |
6207 | if (TREE_CODE (rhs) == CONST_DECL) | |
6208 | rhs = DECL_INITIAL (rhs); | |
6209 | else if (TREE_READONLY_DECL_P (rhs)) | |
6210 | rhs = decl_constant_value (rhs); | |
6211 | ||
6212 | if (type == rhstype) | |
6213 | { | |
6214 | overflow_warning (rhs); | |
6215 | return rhs; | |
6216 | } | |
6217 | ||
6218 | if (coder == VOID_TYPE) | |
6219 | { | |
6220 | error ("void value not ignored as it ought to be"); | |
6221 | return error_mark_node; | |
6222 | } | |
6223 | /* Arithmetic types all interconvert. */ | |
2986ae00 MS |
6224 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == BOOLEAN_TYPE) |
6225 | && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == BOOLEAN_TYPE)) | |
8d08fdba MS |
6226 | { |
6227 | /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */ | |
6228 | if (coder == REAL_TYPE && codel == INTEGER_TYPE) | |
6229 | { | |
6230 | if (fndecl) | |
6231 | cp_warning ("`%T' used for argument %P of `%D'", | |
6232 | rhstype, parmnum, fndecl); | |
6233 | else | |
6234 | cp_warning ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6235 | } | |
6236 | /* And we should warn if assigning a negative value to | |
6237 | an unsigned variable. */ | |
2986ae00 | 6238 | else if (TREE_UNSIGNED (type) && codel != BOOLEAN_TYPE) |
8d08fdba MS |
6239 | { |
6240 | if (TREE_CODE (rhs) == INTEGER_CST | |
6241 | && TREE_NEGATED_INT (rhs)) | |
6242 | { | |
6243 | if (fndecl) | |
6244 | cp_warning ("negative value `%E' passed as argument %P of `%D'", | |
6245 | rhs, parmnum, fndecl); | |
6246 | else | |
6247 | cp_warning ("%s of negative value `%E' to `%T'", | |
6248 | errtype, rhs, type); | |
6249 | } | |
6250 | overflow_warning (rhs); | |
6251 | if (TREE_CONSTANT (rhs)) | |
6252 | rhs = fold (rhs); | |
6253 | } | |
6254 | ||
6255 | return convert_and_check (type, rhs); | |
6256 | } | |
6257 | /* Conversions involving enums. */ | |
6258 | else if ((codel == ENUMERAL_TYPE | |
6060a796 | 6259 | && (INTEGRAL_CODE_P (coder) || coder == REAL_TYPE)) |
8d08fdba | 6260 | || (coder == ENUMERAL_TYPE |
6060a796 | 6261 | && (INTEGRAL_CODE_P (codel) || codel == REAL_TYPE))) |
8d08fdba | 6262 | { |
878cd289 | 6263 | return cp_convert (type, rhs, CONV_IMPLICIT, LOOKUP_NORMAL); |
8d08fdba MS |
6264 | } |
6265 | /* Conversions among pointers */ | |
6266 | else if (codel == POINTER_TYPE | |
6267 | && (coder == POINTER_TYPE | |
6268 | || (coder == RECORD_TYPE | |
6269 | && (IS_SIGNATURE_POINTER (rhstype) | |
6270 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
6271 | { | |
6272 | register tree ttl = TREE_TYPE (type); | |
6273 | register tree ttr; | |
e1cd6e56 | 6274 | int ctt = 0; |
8d08fdba MS |
6275 | |
6276 | if (coder == RECORD_TYPE) | |
6277 | { | |
6278 | rhs = build_optr_ref (rhs); | |
6279 | rhstype = TREE_TYPE (rhs); | |
6280 | } | |
6281 | ttr = TREE_TYPE (rhstype); | |
6282 | ||
6283 | /* If both pointers are of aggregate type, then we | |
6284 | can give better error messages, and save some work | |
6285 | as well. */ | |
6286 | if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE) | |
6287 | { | |
6288 | tree binfo; | |
6289 | ||
6290 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr) | |
6291 | || type == class_star_type_node | |
6292 | || rhstype == class_star_type_node) | |
6293 | binfo = TYPE_BINFO (ttl); | |
6294 | else | |
6295 | binfo = get_binfo (ttl, ttr, 1); | |
6296 | ||
6297 | if (binfo == error_mark_node) | |
6298 | return error_mark_node; | |
6299 | if (binfo == 0) | |
6300 | return error_not_base_type (ttl, ttr); | |
6301 | ||
6302 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
6303 | { | |
6304 | if (fndecl) | |
7177d104 | 6305 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6306 | rhstype, parmnum, fndecl); |
6307 | else | |
7177d104 | 6308 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6309 | errtype, type, rhstype); |
6310 | } | |
6311 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) | |
6312 | { | |
6313 | if (fndecl) | |
7177d104 | 6314 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6315 | rhstype, parmnum, fndecl); |
6316 | else | |
7177d104 | 6317 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6318 | errtype, type, rhstype); |
6319 | } | |
6320 | } | |
6321 | ||
6322 | /* Any non-function converts to a [const][volatile] void * | |
6323 | and vice versa; otherwise, targets must be the same. | |
6324 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
6325 | else if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6326 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
e1cd6e56 | 6327 | || (ctt = comp_target_types (type, rhstype, 1)) |
8d08fdba MS |
6328 | || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) |
6329 | == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
6330 | { | |
6331 | /* ARM $4.8, commentary on p39. */ | |
6332 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6333 | && TREE_CODE (ttr) == OFFSET_TYPE) | |
6334 | { | |
e1cd6e56 | 6335 | cp_error ("no standard conversion from `%T' to `void *'", ttr); |
8d08fdba MS |
6336 | return error_mark_node; |
6337 | } | |
6338 | ||
e1cd6e56 MS |
6339 | if (ctt < 0) |
6340 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", | |
f30432d7 | 6341 | rhstype, type); |
e1cd6e56 | 6342 | |
8d08fdba MS |
6343 | if (TYPE_MAIN_VARIANT (ttl) != void_type_node |
6344 | && TYPE_MAIN_VARIANT (ttr) == void_type_node | |
6345 | && rhs != null_pointer_node) | |
2986ae00 MS |
6346 | { |
6347 | if (coder == RECORD_TYPE) | |
e1cd6e56 MS |
6348 | cp_pedwarn ("implicit conversion of signature pointer to type `%T'", |
6349 | type); | |
2986ae00 MS |
6350 | else |
6351 | pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s", | |
6352 | errtype); | |
6353 | } | |
8d08fdba MS |
6354 | /* Const and volatile mean something different for function types, |
6355 | so the usual warnings are not appropriate. */ | |
6356 | else if ((TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE) | |
6357 | || (TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE)) | |
6358 | { | |
6359 | if (TREE_CODE (ttl) == OFFSET_TYPE | |
6360 | && binfo_member (TYPE_OFFSET_BASETYPE (ttr), | |
6361 | CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl)))) | |
6362 | { | |
6363 | sorry ("%s between pointer to members converting across virtual baseclasses", errtype); | |
6364 | return error_mark_node; | |
6365 | } | |
2986ae00 | 6366 | else if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) |
8d08fdba MS |
6367 | { |
6368 | if (fndecl) | |
7177d104 | 6369 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6370 | rhstype, parmnum, fndecl); |
6371 | else | |
7177d104 | 6372 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6373 | errtype, type, rhstype); |
6374 | } | |
2986ae00 | 6375 | else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
8d08fdba MS |
6376 | { |
6377 | if (fndecl) | |
7177d104 | 6378 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6379 | rhstype, parmnum, fndecl); |
6380 | else | |
7177d104 | 6381 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6382 | errtype, type, rhstype); |
6383 | } | |
2986ae00 MS |
6384 | else if (TREE_CODE (ttl) == TREE_CODE (ttr) |
6385 | && ! comp_target_types (type, rhstype, 1)) | |
6386 | { | |
6387 | if (fndecl) | |
6388 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness", | |
6389 | rhstype, parmnum, fndecl); | |
6390 | else | |
6391 | cp_pedwarn ("%s to `%T' from `%T' changes signedness", | |
6392 | errtype, type, rhstype); | |
6393 | } | |
8d08fdba MS |
6394 | } |
6395 | } | |
6396 | else if (TREE_CODE (ttr) == OFFSET_TYPE | |
6397 | && TREE_CODE (ttl) != OFFSET_TYPE) | |
6398 | { | |
6399 | /* Normally, pointers to different type codes (other | |
6400 | than void) are not compatible, but we perform | |
6401 | some type instantiation if that resolves the | |
6402 | ambiguity of (X Y::*) and (X *). */ | |
6403 | ||
4ac14744 | 6404 | if (current_class_ptr) |
8d08fdba MS |
6405 | { |
6406 | if (TREE_CODE (rhs) == INTEGER_CST) | |
6407 | { | |
6408 | rhs = build (PLUS_EXPR, build_pointer_type (TREE_TYPE (ttr)), | |
4ac14744 | 6409 | current_class_ptr, rhs); |
8d08fdba MS |
6410 | return convert_for_assignment (type, rhs, |
6411 | errtype, fndecl, parmnum); | |
6412 | } | |
6413 | } | |
6414 | if (TREE_CODE (ttl) == METHOD_TYPE) | |
6415 | error ("%s between pointer-to-method and pointer-to-member types", | |
6416 | errtype); | |
6417 | else | |
6418 | error ("%s between pointer and pointer-to-member types", errtype); | |
6419 | return error_mark_node; | |
6420 | } | |
6421 | else | |
6422 | { | |
a0a33927 MS |
6423 | int add_quals = 0, const_parity = 0, volatile_parity = 0; |
6424 | int left_const = 1; | |
8d08fdba MS |
6425 | int unsigned_parity; |
6426 | int nptrs = 0; | |
6427 | ||
a0a33927 MS |
6428 | /* This code is basically a duplicate of comp_ptr_ttypes_real. */ |
6429 | for (; ; ttl = TREE_TYPE (ttl), ttr = TREE_TYPE (ttr)) | |
8d08fdba MS |
6430 | { |
6431 | nptrs -= 1; | |
5566b478 MS |
6432 | const_parity |= (TYPE_READONLY (ttl) < TYPE_READONLY (ttr)); |
6433 | volatile_parity |= (TYPE_VOLATILE (ttl) < TYPE_VOLATILE (ttr)); | |
a0a33927 MS |
6434 | |
6435 | if (! left_const | |
6436 | && (TYPE_READONLY (ttl) > TYPE_READONLY (ttr) | |
6437 | || TYPE_VOLATILE (ttl) > TYPE_VOLATILE (ttr))) | |
6438 | add_quals = 1; | |
6439 | left_const &= TYPE_READONLY (ttl); | |
6440 | ||
a292b002 MS |
6441 | if (TREE_CODE (ttl) != POINTER_TYPE |
6442 | || TREE_CODE (ttr) != POINTER_TYPE) | |
a0a33927 | 6443 | break; |
8d08fdba MS |
6444 | } |
6445 | unsigned_parity = TREE_UNSIGNED (ttl) - TREE_UNSIGNED (ttr); | |
6446 | if (unsigned_parity) | |
a0a33927 MS |
6447 | { |
6448 | if (TREE_UNSIGNED (ttl)) | |
6449 | ttr = unsigned_type (ttr); | |
6450 | else | |
6451 | ttl = unsigned_type (ttl); | |
6452 | } | |
8d08fdba | 6453 | |
e1cd6e56 | 6454 | if (comp_target_types (ttl, ttr, nptrs) > 0) |
8d08fdba | 6455 | { |
a0a33927 MS |
6456 | if (add_quals) |
6457 | { | |
6458 | if (fndecl) | |
6459 | cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'", | |
6460 | rhstype, parmnum, fndecl); | |
6461 | else | |
6462 | cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'", | |
6463 | errtype, type, rhstype); | |
6464 | } | |
8d08fdba MS |
6465 | if (const_parity) |
6466 | { | |
6467 | if (fndecl) | |
a0a33927 | 6468 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6469 | rhstype, parmnum, fndecl); |
6470 | else | |
a0a33927 | 6471 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6472 | errtype, type, rhstype); |
6473 | } | |
6474 | if (volatile_parity) | |
6475 | { | |
6476 | if (fndecl) | |
a0a33927 | 6477 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6478 | rhstype, parmnum, fndecl); |
6479 | else | |
a0a33927 | 6480 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6481 | errtype, type, rhstype); |
6482 | } | |
6483 | if (unsigned_parity > 0) | |
6484 | { | |
6485 | if (fndecl) | |
6486 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned", | |
6487 | rhstype, parmnum, fndecl); | |
6488 | else | |
6489 | cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned", | |
6490 | errtype, type, rhstype); | |
6491 | } | |
6492 | else if (unsigned_parity < 0) | |
6493 | { | |
6494 | if (fndecl) | |
6495 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed", | |
6496 | rhstype, parmnum, fndecl); | |
6497 | else | |
6498 | cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed", | |
6499 | errtype, type, rhstype); | |
6500 | } | |
6501 | ||
6502 | /* C++ is not so friendly about converting function and | |
6503 | member function pointers as C. Emit warnings here. */ | |
6504 | if (TREE_CODE (ttl) == FUNCTION_TYPE | |
6505 | || TREE_CODE (ttl) == METHOD_TYPE) | |
6506 | if (! comptypes (ttl, ttr, 0)) | |
6507 | { | |
6508 | warning ("conflicting function types in %s:", errtype); | |
6509 | cp_warning ("\t`%T' != `%T'", type, rhstype); | |
6510 | } | |
6511 | } | |
8d08fdba MS |
6512 | else |
6513 | { | |
6514 | if (fndecl) | |
6515 | cp_error ("passing `%T' as argument %P of `%D'", | |
6516 | rhstype, parmnum, fndecl); | |
6517 | else | |
6518 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6519 | return error_mark_node; | |
6520 | } | |
6521 | } | |
6522 | return convert (type, rhs); | |
6523 | } | |
6524 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
6525 | { | |
6526 | /* An explicit constant 0 can convert to a pointer, | |
6527 | but not a 0 that results from casting or folding. */ | |
6528 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) | |
6529 | { | |
6530 | if (fndecl) | |
6531 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6532 | rhstype, parmnum, fndecl); | |
6533 | else | |
6534 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6535 | errtype, type, rhstype); | |
6536 | return convert (type, rhs); | |
6537 | } | |
6538 | return null_pointer_node; | |
6539 | } | |
e1cd6e56 | 6540 | else if (codel == INTEGER_TYPE |
8d08fdba MS |
6541 | && (coder == POINTER_TYPE |
6542 | || (coder == RECORD_TYPE | |
6543 | && (IS_SIGNATURE_POINTER (rhstype) | |
f376e137 | 6544 | || TYPE_PTRMEMFUNC_FLAG (rhstype) |
8d08fdba MS |
6545 | || IS_SIGNATURE_REFERENCE (rhstype))))) |
6546 | { | |
6547 | if (fndecl) | |
6548 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6549 | rhstype, parmnum, fndecl); | |
6550 | else | |
6551 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6552 | errtype, type, rhstype); | |
6553 | return convert (type, rhs); | |
6554 | } | |
e1cd6e56 MS |
6555 | else if (codel == BOOLEAN_TYPE |
6556 | && (coder == POINTER_TYPE | |
6557 | || (coder == RECORD_TYPE | |
6558 | && (IS_SIGNATURE_POINTER (rhstype) | |
6559 | || TYPE_PTRMEMFUNC_FLAG (rhstype) | |
6560 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
6561 | return convert (type, rhs); | |
8d08fdba MS |
6562 | |
6563 | /* C++ */ | |
71851aaa | 6564 | else if (((coder == POINTER_TYPE |
8d08fdba | 6565 | && TREE_CODE (TREE_TYPE (rhstype)) == METHOD_TYPE) |
51c184be | 6566 | || integer_zerop (rhs) |
28cbf42c | 6567 | || TYPE_PTRMEMFUNC_P (rhstype)) |
8d08fdba MS |
6568 | && TYPE_PTRMEMFUNC_P (type)) |
6569 | { | |
28cbf42c MS |
6570 | tree ttl = TYPE_PTRMEMFUNC_FN_TYPE (type); |
6571 | tree ttr = (TREE_CODE (rhstype) == POINTER_TYPE ? rhstype | |
6572 | : TYPE_PTRMEMFUNC_FN_TYPE (type)); | |
6573 | int ctt = comp_target_types (ttl, ttr, 1); | |
6574 | ||
6575 | if (ctt < 0) | |
6576 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", | |
6577 | ttr, ttl); | |
6578 | else if (ctt == 0) | |
6579 | cp_error ("%s to `%T' from `%T'", errtype, ttl, ttr); | |
6580 | ||
8d08fdba | 6581 | /* compatible pointer to member functions. */ |
28cbf42c | 6582 | return build_ptrmemfunc (ttl, rhs, 0); |
8d08fdba MS |
6583 | } |
6584 | else if (codel == ERROR_MARK || coder == ERROR_MARK) | |
6585 | return error_mark_node; | |
6586 | ||
6587 | /* This should no longer happen. References are initialized via | |
6588 | `convert_for_initialization'. They should otherwise be | |
6589 | bashed before coming here. */ | |
6590 | else if (codel == REFERENCE_TYPE) | |
db5ae43f | 6591 | my_friendly_abort (317); |
8d08fdba | 6592 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs))) |
51c184be MS |
6593 | { |
6594 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
6595 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
6596 | return nrhs; | |
6597 | } | |
8d08fdba MS |
6598 | else if (TYPE_HAS_CONSTRUCTOR (type) || IS_AGGR_TYPE (TREE_TYPE (rhs))) |
6599 | return convert (type, rhs); | |
6600 | ||
6601 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6602 | return error_mark_node; | |
6603 | } | |
6604 | ||
6605 | /* Convert RHS to be of type TYPE. If EXP is non-zero, | |
6606 | it is the target of the initialization. | |
6607 | ERRTYPE is a string to use in error messages. | |
6608 | ||
6609 | Two major differences between the behavior of | |
6610 | `convert_for_assignment' and `convert_for_initialization' | |
6611 | are that references are bashed in the former, while | |
6612 | copied in the latter, and aggregates are assigned in | |
6613 | the former (operator=) while initialized in the | |
6614 | latter (X(X&)). | |
6615 | ||
6616 | If using constructor make sure no conversion operator exists, if one does | |
878cd289 MS |
6617 | exist, an ambiguity exists. |
6618 | ||
6619 | If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */ | |
8d08fdba MS |
6620 | tree |
6621 | convert_for_initialization (exp, type, rhs, flags, errtype, fndecl, parmnum) | |
6622 | tree exp, type, rhs; | |
6623 | int flags; | |
6624 | char *errtype; | |
6625 | tree fndecl; | |
6626 | int parmnum; | |
6627 | { | |
6628 | register enum tree_code codel = TREE_CODE (type); | |
6629 | register tree rhstype; | |
6630 | register enum tree_code coder; | |
6631 | ||
6632 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
6633 | Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ | |
6634 | if (TREE_CODE (rhs) == NOP_EXPR | |
a0a33927 MS |
6635 | && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) |
6636 | && codel != REFERENCE_TYPE) | |
8d08fdba MS |
6637 | rhs = TREE_OPERAND (rhs, 0); |
6638 | ||
6639 | if (rhs == error_mark_node | |
6640 | || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) | |
6641 | return error_mark_node; | |
6642 | ||
6643 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6644 | { | |
6645 | rhs = resolve_offset_ref (rhs); | |
6646 | if (rhs == error_mark_node) | |
6647 | return error_mark_node; | |
8d08fdba MS |
6648 | } |
6649 | ||
8ccc31eb MS |
6650 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) |
6651 | rhs = convert_from_reference (rhs); | |
6652 | ||
8d08fdba | 6653 | if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE |
8ccc31eb MS |
6654 | && TREE_CODE (type) != ARRAY_TYPE |
6655 | && (TREE_CODE (type) != REFERENCE_TYPE | |
6656 | || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)) | |
8d08fdba MS |
6657 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE |
6658 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6659 | rhs = default_conversion (rhs); | |
6660 | ||
6661 | rhstype = TREE_TYPE (rhs); | |
6662 | coder = TREE_CODE (rhstype); | |
6663 | ||
6664 | if (coder == UNKNOWN_TYPE) | |
6665 | { | |
6666 | rhs = instantiate_type (type, rhs, 1); | |
6667 | rhstype = TREE_TYPE (rhs); | |
6668 | coder = TREE_CODE (rhstype); | |
6669 | } | |
6670 | ||
6671 | if (coder == ERROR_MARK) | |
6672 | return error_mark_node; | |
6673 | ||
8d08fdba MS |
6674 | /* We accept references to incomplete types, so we can |
6675 | return here before checking if RHS is of complete type. */ | |
6676 | ||
6677 | if (codel == REFERENCE_TYPE) | |
2986ae00 MS |
6678 | { |
6679 | /* This should eventually happen in convert_arguments. */ | |
6680 | extern int warningcount, errorcount; | |
6681 | int savew, savee; | |
6682 | ||
6683 | if (fndecl) | |
6684 | savew = warningcount, savee = errorcount; | |
6685 | rhs = convert_to_reference (type, rhs, CONV_IMPLICIT, flags, | |
6686 | exp ? exp : error_mark_node); | |
6687 | if (fndecl) | |
6688 | { | |
6689 | if (warningcount > savew) | |
6690 | cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6691 | else if (errorcount > savee) | |
6692 | cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6693 | } | |
6694 | return rhs; | |
6695 | } | |
8d08fdba MS |
6696 | |
6697 | rhs = require_complete_type (rhs); | |
6698 | if (rhs == error_mark_node) | |
6699 | return error_mark_node; | |
6700 | ||
6701 | if (exp != 0) exp = require_complete_type (exp); | |
6702 | if (exp == error_mark_node) | |
6703 | return error_mark_node; | |
6704 | ||
6705 | if (TREE_CODE (rhstype) == REFERENCE_TYPE) | |
6706 | rhstype = TREE_TYPE (rhstype); | |
6707 | ||
6708 | if (TYPE_LANG_SPECIFIC (type) | |
6709 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
6710 | return build_signature_pointer_constructor (type, rhs); | |
6711 | ||
f376e137 MS |
6712 | if (IS_AGGR_TYPE (type) |
6713 | && (TYPE_NEEDS_CONSTRUCTING (type) || TREE_HAS_CONSTRUCTOR (rhs))) | |
8d08fdba MS |
6714 | { |
6715 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
6716 | { | |
6717 | /* This is sufficient to perform initialization. No need, | |
6718 | apparently, to go through X(X&) to do first-cut | |
6719 | initialization. Return through a TARGET_EXPR so that we get | |
6720 | cleanups if it is used. */ | |
6721 | if (TREE_CODE (rhs) == CALL_EXPR) | |
6722 | { | |
5566b478 | 6723 | rhs = build_cplus_new (type, rhs); |
8d08fdba MS |
6724 | return rhs; |
6725 | } | |
6726 | /* Handle the case of default parameter initialization and | |
6727 | initialization of static variables. */ | |
db5ae43f MS |
6728 | else if (TREE_CODE (rhs) == TARGET_EXPR) |
6729 | return rhs; | |
8d08fdba MS |
6730 | else if (TREE_CODE (rhs) == INDIRECT_REF && TREE_HAS_CONSTRUCTOR (rhs)) |
6731 | { | |
6732 | my_friendly_assert (TREE_CODE (TREE_OPERAND (rhs, 0)) == CALL_EXPR, 318); | |
6733 | if (exp) | |
6734 | { | |
6735 | my_friendly_assert (TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) == NULL_TREE, 316); | |
6736 | TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) | |
6737 | = build_unary_op (ADDR_EXPR, exp, 0); | |
6738 | } | |
6739 | else | |
5566b478 | 6740 | rhs = build_cplus_new (type, TREE_OPERAND (rhs, 0)); |
8d08fdba MS |
6741 | return rhs; |
6742 | } | |
e8abc66f MS |
6743 | else if (TYPE_HAS_TRIVIAL_INIT_REF (type)) |
6744 | return rhs; | |
8d08fdba MS |
6745 | } |
6746 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype) | |
6747 | || (IS_AGGR_TYPE (rhstype) && UNIQUELY_DERIVED_FROM_P (type, rhstype))) | |
6748 | { | |
6749 | if (TYPE_HAS_INIT_REF (type)) | |
6750 | { | |
fc378698 | 6751 | tree init = build_method_call (exp, ctor_identifier, |
8d08fdba | 6752 | build_tree_list (NULL_TREE, rhs), |
700f8a87 | 6753 | TYPE_BINFO (type), LOOKUP_NORMAL); |
8d08fdba MS |
6754 | |
6755 | if (init == error_mark_node) | |
6756 | return error_mark_node; | |
6757 | ||
6758 | if (exp == 0) | |
6759 | { | |
5566b478 | 6760 | exp = build_cplus_new (type, init); |
8d08fdba MS |
6761 | return exp; |
6762 | } | |
6763 | ||
6764 | return build (COMPOUND_EXPR, type, init, exp); | |
6765 | } | |
6766 | ||
6767 | /* ??? The following warnings are turned off because | |
6768 | this is another place where the default X(X&) constructor | |
6769 | is implemented. */ | |
6770 | if (TYPE_HAS_ASSIGNMENT (type)) | |
6771 | cp_warning ("bitwise copy: `%T' defines operator=", type); | |
6772 | ||
6773 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
6774 | rhs = convert_from_reference (rhs); | |
6775 | if (type != rhstype) | |
51c184be MS |
6776 | { |
6777 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
6778 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
6779 | rhs = nrhs; | |
6780 | } | |
8d08fdba MS |
6781 | return rhs; |
6782 | } | |
6783 | ||
fc378698 MS |
6784 | return cp_convert (type, rhs, CONV_OLD_CONVERT, |
6785 | flags | LOOKUP_NO_CONVERSION); | |
8d08fdba MS |
6786 | } |
6787 | ||
6788 | if (type == TREE_TYPE (rhs)) | |
6789 | { | |
6790 | if (TREE_READONLY_DECL_P (rhs)) | |
6791 | rhs = decl_constant_value (rhs); | |
6792 | return rhs; | |
6793 | } | |
6794 | ||
6795 | return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); | |
6796 | } | |
6797 | \f | |
6798 | /* Expand an ASM statement with operands, handling output operands | |
6799 | that are not variables or INDIRECT_REFS by transforming such | |
6800 | cases into cases that expand_asm_operands can handle. | |
6801 | ||
6802 | Arguments are same as for expand_asm_operands. | |
6803 | ||
6804 | We don't do default conversions on all inputs, because it can screw | |
6805 | up operands that are expected to be in memory. */ | |
6806 | ||
6807 | void | |
6808 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
6809 | tree string, outputs, inputs, clobbers; | |
6810 | int vol; | |
6811 | char *filename; | |
6812 | int line; | |
6813 | { | |
6814 | int noutputs = list_length (outputs); | |
6815 | register int i; | |
6816 | /* o[I] is the place that output number I should be written. */ | |
6817 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
6818 | register tree tail; | |
6819 | ||
6820 | /* Record the contents of OUTPUTS before it is modified. */ | |
6821 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6822 | o[i] = TREE_VALUE (tail); | |
6823 | ||
6824 | /* Generate the ASM_OPERANDS insn; | |
6825 | store into the TREE_VALUEs of OUTPUTS some trees for | |
6826 | where the values were actually stored. */ | |
6827 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
6828 | ||
6829 | /* Copy all the intermediate outputs into the specified outputs. */ | |
6830 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6831 | { | |
6832 | if (o[i] != TREE_VALUE (tail)) | |
6833 | { | |
6834 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
6835 | const0_rtx, VOIDmode, 0); | |
6836 | free_temp_slots (); | |
6837 | } | |
6838 | /* Detect modification of read-only values. | |
6839 | (Otherwise done by build_modify_expr.) */ | |
6840 | else | |
6841 | { | |
6842 | tree type = TREE_TYPE (o[i]); | |
6843 | if (TYPE_READONLY (type) | |
6844 | || ((TREE_CODE (type) == RECORD_TYPE | |
6845 | || TREE_CODE (type) == UNION_TYPE) | |
6846 | && C_TYPE_FIELDS_READONLY (type))) | |
6847 | readonly_error (o[i], "modification by `asm'", 1); | |
6848 | } | |
6849 | } | |
6850 | ||
6851 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
6852 | emit_queue (); | |
6853 | } | |
6854 | \f | |
6855 | /* Expand a C `return' statement. | |
6856 | RETVAL is the expression for what to return, | |
6857 | or a null pointer for `return;' with no value. | |
6858 | ||
6859 | C++: upon seeing a `return', we must call destructors on all | |
6860 | variables in scope which had constructors called on them. | |
6861 | This means that if in a destructor, the base class destructors | |
6862 | must be called before returning. | |
6863 | ||
6864 | The RETURN statement in C++ has initialization semantics. */ | |
6865 | ||
6866 | void | |
6867 | c_expand_return (retval) | |
6868 | tree retval; | |
6869 | { | |
6870 | extern struct nesting *cond_stack, *loop_stack, *case_stack; | |
6871 | extern tree dtor_label, ctor_label; | |
6872 | tree result = DECL_RESULT (current_function_decl); | |
6873 | tree valtype = TREE_TYPE (result); | |
8d08fdba MS |
6874 | int returns_value = 1; |
6875 | ||
6876 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
6877 | warning ("function declared `noreturn' has a `return' statement"); | |
6878 | ||
6879 | if (retval == error_mark_node) | |
6880 | { | |
6881 | current_function_returns_null = 1; | |
6882 | return; | |
6883 | } | |
6884 | ||
5566b478 MS |
6885 | if (current_template_parms) |
6886 | { | |
6887 | add_tree (build_min_nt (RETURN_STMT, retval)); | |
6888 | return; | |
6889 | } | |
6890 | ||
8d08fdba MS |
6891 | if (retval == NULL_TREE) |
6892 | { | |
6893 | /* A non-named return value does not count. */ | |
6894 | ||
6895 | /* Can't just return from a destructor. */ | |
6896 | if (dtor_label) | |
6897 | { | |
6898 | expand_goto (dtor_label); | |
6899 | return; | |
6900 | } | |
6901 | ||
6902 | if (DECL_CONSTRUCTOR_P (current_function_decl)) | |
4ac14744 | 6903 | retval = current_class_ptr; |
8d08fdba MS |
6904 | else if (DECL_NAME (result) != NULL_TREE |
6905 | && TREE_CODE (valtype) != VOID_TYPE) | |
6906 | retval = result; | |
6907 | else | |
6908 | { | |
6909 | current_function_returns_null = 1; | |
6910 | ||
6911 | if (valtype != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) | |
6912 | { | |
6913 | if (DECL_NAME (DECL_RESULT (current_function_decl)) == NULL_TREE) | |
6914 | { | |
6915 | pedwarn ("`return' with no value, in function returning non-void"); | |
6916 | /* Clear this, so finish_function won't say that we | |
6917 | reach the end of a non-void function (which we don't, | |
6918 | we gave a return!). */ | |
6919 | current_function_returns_null = 0; | |
6920 | } | |
6921 | } | |
6922 | ||
6923 | expand_null_return (); | |
6924 | return; | |
6925 | } | |
6926 | } | |
6927 | else if (DECL_CONSTRUCTOR_P (current_function_decl) | |
4ac14744 | 6928 | && retval != current_class_ptr) |
8d08fdba MS |
6929 | { |
6930 | error ("return from a constructor: use `this = ...' instead"); | |
4ac14744 | 6931 | retval = current_class_ptr; |
8d08fdba MS |
6932 | } |
6933 | ||
6934 | if (valtype == NULL_TREE || TREE_CODE (valtype) == VOID_TYPE) | |
6935 | { | |
6936 | current_function_returns_null = 1; | |
6937 | /* We do this here so we'll avoid a warning about how the function | |
6938 | "may or may not return a value" in finish_function. */ | |
6939 | returns_value = 0; | |
6940 | ||
39211cd5 | 6941 | if (retval) |
8d08fdba MS |
6942 | pedwarn ("`return' with a value, in function returning void"); |
6943 | expand_return (retval); | |
6944 | } | |
6945 | /* Add some useful error checking for C++. */ | |
6946 | else if (TREE_CODE (valtype) == REFERENCE_TYPE) | |
6947 | { | |
6948 | tree whats_returned; | |
6949 | tree tmp_result = result; | |
6950 | ||
6951 | /* Don't initialize directly into a non-BLKmode retval, since that | |
6952 | could lose when being inlined by another caller. (GCC can't | |
6953 | read the function return register in an inline function when | |
6954 | the return value is being ignored). */ | |
6955 | if (result && TYPE_MODE (TREE_TYPE (tmp_result)) != BLKmode) | |
6956 | tmp_result = 0; | |
6957 | ||
6958 | /* convert to reference now, so we can give error if we | |
6959 | return an reference to a non-lvalue. */ | |
6960 | retval = convert_for_initialization (tmp_result, valtype, retval, | |
6961 | LOOKUP_NORMAL, "return", | |
6962 | NULL_TREE, 0); | |
6963 | ||
6964 | /* Sort through common things to see what it is | |
6965 | we are returning. */ | |
6966 | whats_returned = retval; | |
6967 | if (TREE_CODE (whats_returned) == COMPOUND_EXPR) | |
6968 | { | |
6969 | whats_returned = TREE_OPERAND (whats_returned, 1); | |
6970 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
6971 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
6972 | } | |
6973 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
6974 | { | |
6975 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
6976 | while (TREE_CODE (whats_returned) == NEW_EXPR | |
2ee887f2 | 6977 | || TREE_CODE (whats_returned) == TARGET_EXPR) |
f376e137 MS |
6978 | { |
6979 | /* Get the target. */ | |
6980 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
6981 | warning ("returning reference to temporary"); | |
6982 | } | |
8d08fdba MS |
6983 | } |
6984 | ||
6985 | if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned)) | |
6986 | { | |
6987 | if (TEMP_NAME_P (DECL_NAME (whats_returned))) | |
6988 | warning ("reference to non-lvalue returned"); | |
6989 | else if (! TREE_STATIC (whats_returned) | |
e76a2646 MS |
6990 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) |
6991 | && !TREE_PUBLIC (whats_returned)) | |
8d08fdba MS |
6992 | cp_warning_at ("reference to local variable `%D' returned", whats_returned); |
6993 | } | |
6994 | } | |
6995 | else if (TREE_CODE (retval) == ADDR_EXPR) | |
6996 | { | |
6997 | tree whats_returned = TREE_OPERAND (retval, 0); | |
6998 | ||
8926095f MS |
6999 | if (TREE_CODE (whats_returned) == VAR_DECL |
7000 | && DECL_NAME (whats_returned) | |
8d08fdba | 7001 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) |
e76a2646 MS |
7002 | && !TREE_STATIC (whats_returned) |
7003 | && !TREE_PUBLIC (whats_returned)) | |
8d08fdba MS |
7004 | cp_warning_at ("address of local variable `%D' returned", whats_returned); |
7005 | } | |
c91a56d2 MS |
7006 | else if (TREE_CODE (retval) == VAR_DECL) |
7007 | { | |
7008 | if (TREE_CODE (TREE_TYPE (retval)) == ARRAY_TYPE | |
7009 | && DECL_NAME (retval) | |
7010 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (retval)) | |
7011 | && !TREE_STATIC (retval) | |
7012 | && !TREE_PUBLIC (retval)) | |
7013 | cp_warning_at ("address of local array `%D' returned", retval); | |
7014 | } | |
8d08fdba MS |
7015 | |
7016 | /* Now deal with possible C++ hair: | |
7017 | (1) Compute the return value. | |
7018 | (2) If there are aggregate values with destructors which | |
7019 | must be cleaned up, clean them (taking care | |
7020 | not to clobber the return value). | |
7021 | (3) If an X(X&) constructor is defined, the return | |
7022 | value must be returned via that. */ | |
7023 | ||
e8abc66f MS |
7024 | /* If we're returning in a register, we can't initialize the |
7025 | return value from a TARGET_EXPR. */ | |
7026 | if (TREE_CODE (retval) == TARGET_EXPR | |
7027 | && TYPE_MAIN_VARIANT (TREE_TYPE (retval)) == TYPE_MAIN_VARIANT (valtype) | |
7028 | && ! current_function_returns_struct) | |
7029 | retval = expand_target_expr (retval); | |
7030 | ||
8d08fdba MS |
7031 | if (retval == result |
7032 | /* Watch out for constructors, which "return" aggregates | |
7033 | via initialization, but which otherwise "return" a pointer. */ | |
7034 | || DECL_CONSTRUCTOR_P (current_function_decl)) | |
7035 | { | |
7036 | /* This is just an error--it's already been reported. */ | |
7037 | if (TYPE_SIZE (valtype) == NULL_TREE) | |
7038 | return; | |
7039 | ||
7040 | if (TYPE_MODE (valtype) != BLKmode | |
7041 | && any_pending_cleanups (1)) | |
5566b478 | 7042 | retval = get_temp_regvar (valtype, retval); |
8d08fdba | 7043 | } |
e8abc66f | 7044 | else if (IS_AGGR_TYPE (valtype) && current_function_returns_struct) |
8d08fdba | 7045 | { |
6060a796 | 7046 | expand_aggr_init (result, retval, 0, LOOKUP_ONLYCONVERTING); |
a292b002 | 7047 | expand_cleanups_to (NULL_TREE); |
8d08fdba MS |
7048 | DECL_INITIAL (result) = NULL_TREE; |
7049 | retval = 0; | |
7050 | } | |
7051 | else | |
7052 | { | |
7053 | if (TYPE_MODE (valtype) == VOIDmode) | |
7054 | { | |
7055 | if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode | |
7056 | && warn_return_type) | |
7057 | warning ("return of void value in function returning non-void"); | |
7058 | expand_expr_stmt (retval); | |
7059 | retval = 0; | |
7060 | result = 0; | |
7061 | } | |
7062 | else if (TYPE_MODE (valtype) != BLKmode | |
7063 | && any_pending_cleanups (1)) | |
7064 | { | |
7065 | retval = get_temp_regvar (valtype, retval); | |
a292b002 | 7066 | expand_cleanups_to (NULL_TREE); |
8d08fdba MS |
7067 | result = 0; |
7068 | } | |
7069 | else | |
7070 | { | |
7071 | retval = convert_for_initialization (result, valtype, retval, | |
7072 | LOOKUP_NORMAL, | |
7073 | "return", NULL_TREE, 0); | |
7074 | DECL_INITIAL (result) = NULL_TREE; | |
7075 | } | |
7076 | if (retval == error_mark_node) | |
7077 | return; | |
7078 | } | |
7079 | ||
7080 | emit_queue (); | |
7081 | ||
7082 | if (retval != NULL_TREE | |
7083 | && TREE_CODE_CLASS (TREE_CODE (retval)) == 'd' | |
7084 | && cond_stack == 0 && loop_stack == 0 && case_stack == 0) | |
7085 | current_function_return_value = retval; | |
7086 | ||
7087 | if (result) | |
7088 | { | |
7089 | /* Everything's great--RETVAL is in RESULT. */ | |
7090 | if (original_result_rtx) | |
a292b002 MS |
7091 | { |
7092 | store_expr (result, original_result_rtx, 0); | |
7093 | expand_cleanups_to (NULL_TREE); | |
f30432d7 MS |
7094 | use_variable (DECL_RTL (result)); |
7095 | if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) | |
7096 | expand_goto (ctor_label); | |
7097 | else | |
7098 | expand_null_return (); | |
a292b002 | 7099 | } |
8d08fdba MS |
7100 | else if (retval && retval != result) |
7101 | { | |
7102 | /* Clear this out so the later call to decl_function_context | |
7103 | won't end up bombing on us. */ | |
7104 | if (DECL_CONTEXT (result) == error_mark_node) | |
7105 | DECL_CONTEXT (result) = NULL_TREE; | |
7106 | /* Here is where we finally get RETVAL into RESULT. | |
7107 | `expand_return' does the magic of protecting | |
7108 | RESULT from cleanups. */ | |
8ccc31eb MS |
7109 | retval = fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (result), |
7110 | retval)); | |
eac293a1 MS |
7111 | /* This part _must_ come second, because expand_return looks for |
7112 | the INIT_EXPR as the toplevel node only. :-( */ | |
8d08fdba MS |
7113 | retval = build (INIT_EXPR, TREE_TYPE (result), result, retval); |
7114 | TREE_SIDE_EFFECTS (retval) = 1; | |
7115 | expand_return (retval); | |
7116 | } | |
7117 | else | |
7118 | expand_return (result); | |
8d08fdba MS |
7119 | } |
7120 | else | |
7121 | { | |
7122 | /* We may still need to put RETVAL into RESULT. */ | |
7123 | result = DECL_RESULT (current_function_decl); | |
7124 | if (original_result_rtx) | |
7125 | { | |
7126 | /* Here we have a named return value that went | |
7127 | into memory. We can compute RETVAL into that. */ | |
7128 | if (retval) | |
7129 | expand_assignment (result, retval, 0, 0); | |
7130 | else | |
7131 | store_expr (result, original_result_rtx, 0); | |
7132 | result = make_tree (TREE_TYPE (result), original_result_rtx); | |
7133 | } | |
7134 | else if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) | |
7135 | { | |
4ac14744 | 7136 | /* Here RETVAL is CURRENT_CLASS_PTR, so there's nothing to do. */ |
8d08fdba MS |
7137 | expand_goto (ctor_label); |
7138 | } | |
7139 | else if (retval) | |
7140 | { | |
7141 | /* Here is where we finally get RETVAL into RESULT. | |
7142 | `expand_return' does the magic of protecting | |
7143 | RESULT from cleanups. */ | |
7144 | result = build (INIT_EXPR, TREE_TYPE (result), result, retval); | |
7145 | TREE_SIDE_EFFECTS (result) = 1; | |
7146 | expand_return (result); | |
7147 | } | |
7148 | else if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode) | |
7149 | expand_return (result); | |
7150 | } | |
7151 | ||
7152 | current_function_returns_value = returns_value; | |
8d08fdba MS |
7153 | |
7154 | /* One way to clear out cleanups that EXPR might | |
7155 | generate. Note that this code will really be | |
7156 | dead code, but that is ok--cleanups that were | |
7157 | needed were handled by the magic of `return'. */ | |
7158 | expand_cleanups_to (NULL_TREE); | |
7159 | } | |
7160 | \f | |
7161 | /* Start a C switch statement, testing expression EXP. | |
7162 | Return EXP if it is valid, an error node otherwise. */ | |
7163 | ||
7164 | tree | |
7165 | c_expand_start_case (exp) | |
7166 | tree exp; | |
7167 | { | |
7168 | tree type; | |
7169 | register enum tree_code code; | |
7170 | ||
7171 | /* Convert from references, etc. */ | |
7172 | exp = default_conversion (exp); | |
7173 | type = TREE_TYPE (exp); | |
7174 | code = TREE_CODE (type); | |
7175 | ||
7176 | if (IS_AGGR_TYPE_CODE (code)) | |
7177 | exp = build_type_conversion (CONVERT_EXPR, integer_type_node, exp, 1); | |
7178 | ||
7179 | if (exp == NULL_TREE) | |
7180 | { | |
7181 | error ("switch quantity not an integer"); | |
7182 | exp = error_mark_node; | |
7183 | } | |
7184 | type = TREE_TYPE (exp); | |
7185 | code = TREE_CODE (type); | |
7186 | ||
7187 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
7188 | { | |
7189 | error ("switch quantity not an integer"); | |
7190 | exp = error_mark_node; | |
7191 | } | |
7192 | else | |
7193 | { | |
7194 | tree index; | |
7195 | ||
7196 | exp = default_conversion (exp); | |
7197 | type = TREE_TYPE (exp); | |
7198 | index = get_unwidened (exp, 0); | |
7199 | /* We can't strip a conversion from a signed type to an unsigned, | |
7200 | because if we did, int_fits_type_p would do the wrong thing | |
7201 | when checking case values for being in range, | |
7202 | and it's too hard to do the right thing. */ | |
7203 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
7204 | == TREE_UNSIGNED (TREE_TYPE (index))) | |
7205 | exp = index; | |
7206 | } | |
7207 | ||
8ccc31eb MS |
7208 | expand_start_case |
7209 | (1, fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (exp), exp)), | |
7210 | type, "switch statement"); | |
8d08fdba MS |
7211 | |
7212 | return exp; | |
7213 | } | |
a0a33927 MS |
7214 | |
7215 | /* CONSTP remembers whether or not all the intervening pointers in the `to' | |
7216 | type have been const. */ | |
7217 | int | |
7218 | comp_ptr_ttypes_real (to, from, constp) | |
7219 | tree to, from; | |
7220 | int constp; | |
7221 | { | |
7222 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7223 | { | |
7224 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7225 | return 0; | |
7226 | ||
f30432d7 MS |
7227 | /* Const and volatile mean something different for function types, |
7228 | so the usual checks are not appropriate. */ | |
7229 | if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) | |
7230 | { | |
7231 | if (TYPE_READONLY (from) > TYPE_READONLY (to) | |
7232 | || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) | |
7233 | return 0; | |
a0a33927 | 7234 | |
f30432d7 MS |
7235 | if (! constp |
7236 | && (TYPE_READONLY (to) > TYPE_READONLY (from) | |
7237 | || TYPE_VOLATILE (to) > TYPE_READONLY (from))) | |
7238 | return 0; | |
7239 | constp &= TYPE_READONLY (to); | |
7240 | } | |
a0a33927 MS |
7241 | |
7242 | if (TREE_CODE (to) != POINTER_TYPE) | |
7243 | return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); | |
7244 | } | |
7245 | } | |
7246 | ||
7247 | /* When comparing, say, char ** to char const **, this function takes the | |
7248 | 'char *' and 'char const *'. Do not pass non-pointer types to this | |
7249 | function. */ | |
7250 | int | |
7251 | comp_ptr_ttypes (to, from) | |
7252 | tree to, from; | |
7253 | { | |
7254 | return comp_ptr_ttypes_real (to, from, 1); | |
7255 | } |