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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 | ||
8d08fdba MS |
32 | #include "config.h" |
33 | #include <stdio.h> | |
34 | #include "tree.h" | |
35 | #include "rtl.h" | |
36 | #include "cp-tree.h" | |
37 | #include "flags.h" | |
e8abc66f | 38 | #include "output.h" |
9f617717 | 39 | #include "expr.h" |
8d08fdba | 40 | |
49c249e1 JM |
41 | #ifdef HAVE_STRING_H |
42 | #include <string.h> | |
43 | #endif | |
44 | ||
45 | extern void compiler_error (); | |
46 | ||
47 | static tree convert_for_assignment PROTO((tree, tree, char*, tree, | |
48 | int)); | |
49 | static tree pointer_int_sum PROTO((enum tree_code, tree, tree)); | |
50 | static tree rationalize_conditional_expr PROTO((enum tree_code, tree)); | |
bd6dd845 | 51 | static int comp_target_parms PROTO((tree, tree, int)); |
49c249e1 | 52 | static int comp_ptr_ttypes_real PROTO((tree, tree, int)); |
bd6dd845 MS |
53 | static int comp_ptr_ttypes_const PROTO((tree, tree)); |
54 | static int comp_ptr_ttypes_reinterpret PROTO((tree, tree)); | |
49c249e1 JM |
55 | static int comp_array_types PROTO((int (*) (tree, tree, int), tree, |
56 | tree, int)); | |
57 | static tree build_ptrmemfunc1 PROTO((tree, tree, tree, tree, tree)); | |
58 | static tree common_base_type PROTO((tree, tree)); | |
59 | static tree convert_sequence PROTO((tree, tree)); | |
60 | static tree lookup_anon_field PROTO((tree, tree)); | |
61 | static tree pointer_diff PROTO((tree, tree)); | |
62 | static tree qualify_type PROTO((tree, tree)); | |
63 | static tree expand_target_expr PROTO((tree)); | |
8145f082 | 64 | static tree get_delta_difference PROTO((tree, tree, int)); |
8d08fdba | 65 | |
8d08fdba MS |
66 | /* Return the target type of TYPE, which meas return T for: |
67 | T*, T&, T[], T (...), and otherwise, just T. */ | |
68 | ||
69 | tree | |
70 | target_type (type) | |
71 | tree type; | |
72 | { | |
73 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
74 | type = TREE_TYPE (type); | |
75 | while (TREE_CODE (type) == POINTER_TYPE | |
76 | || TREE_CODE (type) == ARRAY_TYPE | |
77 | || TREE_CODE (type) == FUNCTION_TYPE | |
78 | || TREE_CODE (type) == METHOD_TYPE | |
79 | || TREE_CODE (type) == OFFSET_TYPE) | |
80 | type = TREE_TYPE (type); | |
81 | return type; | |
82 | } | |
83 | ||
84 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
85 | does not have an incomplete type. (That includes void types.) */ | |
86 | ||
87 | tree | |
88 | require_complete_type (value) | |
89 | tree value; | |
90 | { | |
5566b478 MS |
91 | tree type; |
92 | ||
5156628f | 93 | if (processing_template_decl) |
5566b478 MS |
94 | return value; |
95 | ||
96 | type = TREE_TYPE (value); | |
8d08fdba MS |
97 | |
98 | /* First, detect a valid value with a complete type. */ | |
99 | if (TYPE_SIZE (type) != 0 | |
100 | && type != void_type_node | |
101 | && ! (TYPE_LANG_SPECIFIC (type) | |
102 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)) | |
103 | && TYPE_SIZE (SIGNATURE_TYPE (type)) == 0)) | |
104 | return value; | |
105 | ||
106 | /* If we see X::Y, we build an OFFSET_TYPE which has | |
107 | not been laid out. Try to avoid an error by interpreting | |
108 | it as this->X::Y, if reasonable. */ | |
109 | if (TREE_CODE (value) == OFFSET_REF | |
4ac14744 MS |
110 | && current_class_ref != 0 |
111 | && TREE_OPERAND (value, 0) == current_class_ref) | |
8d08fdba MS |
112 | { |
113 | tree base, member = TREE_OPERAND (value, 1); | |
114 | tree basetype = TYPE_OFFSET_BASETYPE (type); | |
115 | my_friendly_assert (TREE_CODE (member) == FIELD_DECL, 305); | |
4ac14744 | 116 | base = convert_pointer_to (basetype, current_class_ptr); |
8d08fdba MS |
117 | value = build (COMPONENT_REF, TREE_TYPE (member), |
118 | build_indirect_ref (base, NULL_PTR), member); | |
119 | return require_complete_type (value); | |
120 | } | |
121 | ||
5566b478 MS |
122 | if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) |
123 | { | |
909e536a | 124 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
125 | if (TYPE_SIZE (type) != 0) |
126 | return value; | |
127 | } | |
128 | ||
8d08fdba MS |
129 | incomplete_type_error (value, type); |
130 | return error_mark_node; | |
131 | } | |
132 | ||
5566b478 MS |
133 | tree |
134 | complete_type (type) | |
135 | tree type; | |
136 | { | |
e92cc029 | 137 | if (type == error_mark_node || TYPE_SIZE (type) != NULL_TREE) |
5566b478 | 138 | ; |
e349ee73 | 139 | else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type)) |
5566b478 MS |
140 | { |
141 | tree t = complete_type (TREE_TYPE (type)); | |
5156628f | 142 | if (TYPE_SIZE (t) != NULL_TREE && ! processing_template_decl) |
6467930b | 143 | layout_type (type); |
c73964b2 MS |
144 | TYPE_NEEDS_CONSTRUCTING (type) |
145 | = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t)); | |
146 | TYPE_NEEDS_DESTRUCTOR (type) | |
147 | = TYPE_NEEDS_DESTRUCTOR (TYPE_MAIN_VARIANT (t)); | |
5566b478 MS |
148 | } |
149 | else if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
e76a2646 | 150 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
151 | |
152 | return type; | |
153 | } | |
154 | ||
8d08fdba | 155 | /* Return truthvalue of whether type of EXP is instantiated. */ |
e92cc029 | 156 | |
8d08fdba MS |
157 | int |
158 | type_unknown_p (exp) | |
159 | tree exp; | |
160 | { | |
161 | return (TREE_CODE (exp) == TREE_LIST | |
162 | || TREE_TYPE (exp) == unknown_type_node | |
163 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
164 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)); | |
165 | } | |
166 | ||
167 | /* Return truthvalue of whether T is function (or pfn) type. */ | |
e92cc029 | 168 | |
8d08fdba MS |
169 | int |
170 | fntype_p (t) | |
171 | tree t; | |
172 | { | |
173 | return (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE | |
174 | || (TREE_CODE (t) == POINTER_TYPE | |
175 | && (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE | |
176 | || TREE_CODE (TREE_TYPE (t)) == METHOD_TYPE))); | |
177 | } | |
178 | ||
179 | /* Do `exp = require_instantiated_type (type, exp);' to make sure EXP | |
180 | does not have an uninstantiated type. | |
181 | TYPE is type to instantiate with, if uninstantiated. */ | |
e92cc029 | 182 | |
8d08fdba MS |
183 | tree |
184 | require_instantiated_type (type, exp, errval) | |
185 | tree type, exp, errval; | |
186 | { | |
187 | if (TREE_TYPE (exp) == NULL_TREE) | |
188 | { | |
189 | error ("argument list may not have an initializer list"); | |
190 | return errval; | |
191 | } | |
192 | ||
193 | if (TREE_TYPE (exp) == unknown_type_node | |
194 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
195 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)) | |
196 | { | |
197 | exp = instantiate_type (type, exp, 1); | |
198 | if (TREE_TYPE (exp) == error_mark_node) | |
199 | return errval; | |
200 | } | |
201 | return exp; | |
202 | } | |
203 | ||
204 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
205 | as well as those of TYPE. */ | |
206 | ||
207 | static tree | |
208 | qualify_type (type, like) | |
209 | tree type, like; | |
210 | { | |
211 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
212 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
213 | /* @@ Must do member pointers here. */ | |
f376e137 | 214 | return cp_build_type_variant (type, constflag, volflag); |
8d08fdba MS |
215 | } |
216 | \f | |
217 | /* Return the common type of two parameter lists. | |
218 | We assume that comptypes has already been done and returned 1; | |
219 | if that isn't so, this may crash. | |
220 | ||
221 | As an optimization, free the space we allocate if the parameter | |
222 | lists are already common. */ | |
223 | ||
224 | tree | |
225 | commonparms (p1, p2) | |
226 | tree p1, p2; | |
227 | { | |
228 | tree oldargs = p1, newargs, n; | |
229 | int i, len; | |
230 | int any_change = 0; | |
231 | char *first_obj = (char *) oballoc (0); | |
232 | ||
233 | len = list_length (p1); | |
234 | newargs = tree_last (p1); | |
235 | ||
236 | if (newargs == void_list_node) | |
237 | i = 1; | |
238 | else | |
239 | { | |
240 | i = 0; | |
241 | newargs = 0; | |
242 | } | |
243 | ||
244 | for (; i < len; i++) | |
245 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); | |
246 | ||
247 | n = newargs; | |
248 | ||
249 | for (i = 0; p1; | |
250 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) | |
251 | { | |
252 | if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) | |
253 | { | |
8d08fdba MS |
254 | TREE_PURPOSE (n) = TREE_PURPOSE (p1); |
255 | any_change = 1; | |
256 | } | |
257 | else if (! TREE_PURPOSE (p1)) | |
258 | { | |
259 | if (TREE_PURPOSE (p2)) | |
260 | { | |
261 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); | |
262 | any_change = 1; | |
263 | } | |
264 | } | |
265 | else | |
266 | { | |
1743ca29 | 267 | if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2))) |
a4443a08 | 268 | any_change = 1; |
8d08fdba MS |
269 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); |
270 | } | |
271 | if (TREE_VALUE (p1) != TREE_VALUE (p2)) | |
272 | { | |
273 | any_change = 1; | |
274 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
275 | } | |
276 | else | |
277 | TREE_VALUE (n) = TREE_VALUE (p1); | |
278 | } | |
279 | if (! any_change) | |
280 | { | |
281 | obfree (first_obj); | |
282 | return oldargs; | |
283 | } | |
284 | ||
285 | return newargs; | |
286 | } | |
287 | ||
288 | /* Return the common type of two types. | |
289 | We assume that comptypes has already been done and returned 1; | |
290 | if that isn't so, this may crash. | |
291 | ||
292 | This is the type for the result of most arithmetic operations | |
293 | if the operands have the given two types. | |
294 | ||
295 | We do not deal with enumeral types here because they have already been | |
296 | converted to integer types. */ | |
297 | ||
298 | tree | |
299 | common_type (t1, t2) | |
300 | tree t1, t2; | |
301 | { | |
302 | register enum tree_code code1; | |
303 | register enum tree_code code2; | |
2986ae00 | 304 | tree attributes; |
8d08fdba MS |
305 | |
306 | /* Save time if the two types are the same. */ | |
307 | ||
308 | if (t1 == t2) return t1; | |
309 | ||
310 | /* If one type is nonsense, use the other. */ | |
311 | if (t1 == error_mark_node) | |
312 | return t2; | |
313 | if (t2 == error_mark_node) | |
314 | return t1; | |
315 | ||
2986ae00 MS |
316 | /* Merge the attributes */ |
317 | ||
318 | { register tree a1, a2; | |
319 | a1 = TYPE_ATTRIBUTES (t1); | |
320 | a2 = TYPE_ATTRIBUTES (t2); | |
321 | ||
322 | /* Either one unset? Take the set one. */ | |
323 | ||
324 | if (!(attributes = a1)) | |
325 | attributes = a2; | |
326 | ||
327 | /* One that completely contains the other? Take it. */ | |
328 | ||
329 | else if (a2 && !attribute_list_contained (a1, a2)) | |
330 | if (attribute_list_contained (a2, a1)) | |
331 | attributes = a2; | |
332 | else | |
333 | { | |
2db70b29 DE |
334 | /* Pick the longest list, and hang on the other list. */ |
335 | /* ??? For the moment we punt on the issue of attrs with args. */ | |
2986ae00 MS |
336 | |
337 | if (list_length (a1) < list_length (a2)) | |
338 | attributes = a2, a2 = a1; | |
339 | ||
340 | for (; a2; a2 = TREE_CHAIN (a2)) | |
2db70b29 DE |
341 | if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)), |
342 | attributes) == NULL_TREE) | |
2986ae00 MS |
343 | { |
344 | a1 = copy_node (a2); | |
345 | TREE_CHAIN (a1) = attributes; | |
346 | attributes = a1; | |
347 | } | |
348 | } | |
349 | } | |
350 | ||
8d08fdba MS |
351 | /* Treat an enum type as the unsigned integer type of the same width. */ |
352 | ||
353 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
354 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
355 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
356 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
357 | ||
5566b478 MS |
358 | if (TYPE_PTRMEMFUNC_P (t1)) |
359 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
360 | if (TYPE_PTRMEMFUNC_P (t2)) | |
361 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
362 | ||
8d08fdba MS |
363 | code1 = TREE_CODE (t1); |
364 | code2 = TREE_CODE (t2); | |
365 | ||
37c46b43 MS |
366 | /* If one type is complex, form the common type of the non-complex |
367 | components, then make that complex. Use T1 or T2 if it is the | |
368 | required type. */ | |
369 | if (code1 == COMPLEX_TYPE || code2 == COMPLEX_TYPE) | |
370 | { | |
371 | tree subtype1 = code1 == COMPLEX_TYPE ? TREE_TYPE (t1) : t1; | |
372 | tree subtype2 = code2 == COMPLEX_TYPE ? TREE_TYPE (t2) : t2; | |
373 | tree subtype = common_type (subtype1, subtype2); | |
374 | ||
375 | if (code1 == COMPLEX_TYPE && TREE_TYPE (t1) == subtype) | |
376 | return build_type_attribute_variant (t1, attributes); | |
377 | else if (code2 == COMPLEX_TYPE && TREE_TYPE (t2) == subtype) | |
378 | return build_type_attribute_variant (t2, attributes); | |
379 | else | |
380 | return build_type_attribute_variant (build_complex_type (subtype), | |
381 | attributes); | |
382 | } | |
383 | ||
8d08fdba MS |
384 | switch (code1) |
385 | { | |
386 | case INTEGER_TYPE: | |
387 | case REAL_TYPE: | |
388 | /* If only one is real, use it as the result. */ | |
389 | ||
390 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
2986ae00 | 391 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
392 | |
393 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
2986ae00 | 394 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
395 | |
396 | /* Both real or both integers; use the one with greater precision. */ | |
397 | ||
398 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
2986ae00 | 399 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 400 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
2986ae00 | 401 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
402 | |
403 | /* Same precision. Prefer longs to ints even when same size. */ | |
2986ae00 | 404 | |
8d08fdba MS |
405 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
406 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
2986ae00 MS |
407 | return build_type_attribute_variant (long_unsigned_type_node, |
408 | attributes); | |
8d08fdba MS |
409 | |
410 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node | |
411 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
412 | { | |
413 | /* But preserve unsignedness from the other type, | |
414 | since long cannot hold all the values of an unsigned int. */ | |
415 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
2986ae00 MS |
416 | t1 = long_unsigned_type_node; |
417 | else | |
418 | t1 = long_integer_type_node; | |
419 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
420 | } |
421 | ||
e1cd6e56 MS |
422 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node |
423 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
424 | return build_type_attribute_variant (long_double_type_node, | |
425 | attributes); | |
426 | ||
8d08fdba MS |
427 | /* Otherwise prefer the unsigned one. */ |
428 | ||
429 | if (TREE_UNSIGNED (t1)) | |
2986ae00 MS |
430 | return build_type_attribute_variant (t1, attributes); |
431 | else | |
432 | return build_type_attribute_variant (t2, attributes); | |
8d08fdba MS |
433 | |
434 | case POINTER_TYPE: | |
435 | case REFERENCE_TYPE: | |
436 | /* For two pointers, do this recursively on the target type, | |
437 | and combine the qualifiers of the two types' targets. */ | |
438 | /* This code was turned off; I don't know why. | |
439 | But ANSI C++ specifies doing this with the qualifiers. | |
440 | So I turned it on again. */ | |
441 | { | |
28cbf42c MS |
442 | tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (t1)); |
443 | tree tt2 = TYPE_MAIN_VARIANT (TREE_TYPE (t2)); | |
8d08fdba MS |
444 | int constp |
445 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
446 | int volatilep | |
447 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
28cbf42c MS |
448 | tree target; |
449 | ||
450 | if (tt1 == tt2) | |
451 | target = tt1; | |
7215f9a0 | 452 | else if (tt1 == void_type_node || tt2 == void_type_node) |
28cbf42c | 453 | target = void_type_node; |
a6967cc0 JM |
454 | else if (tt1 == unknown_type_node) |
455 | target = tt2; | |
456 | else if (tt2 == unknown_type_node) | |
457 | target = tt1; | |
7215f9a0 MS |
458 | else |
459 | target = common_type (tt1, tt2); | |
28cbf42c | 460 | |
f376e137 | 461 | target = cp_build_type_variant (target, constp, volatilep); |
8d08fdba | 462 | if (code1 == POINTER_TYPE) |
2986ae00 | 463 | t1 = build_pointer_type (target); |
8d08fdba | 464 | else |
2986ae00 | 465 | t1 = build_reference_type (target); |
71851aaa MS |
466 | t1 = build_type_attribute_variant (t1, attributes); |
467 | ||
468 | if (TREE_CODE (target) == METHOD_TYPE) | |
469 | t1 = build_ptrmemfunc_type (t1); | |
470 | ||
471 | return t1; | |
8d08fdba | 472 | } |
8d08fdba MS |
473 | |
474 | case ARRAY_TYPE: | |
475 | { | |
476 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
477 | /* Save space: see if the result is identical to one of the args. */ | |
478 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
2986ae00 | 479 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 480 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
2986ae00 | 481 | return build_type_attribute_variant (t2, attributes); |
8d08fdba | 482 | /* Merge the element types, and have a size if either arg has one. */ |
e349ee73 MS |
483 | t1 = build_cplus_array_type |
484 | (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); | |
2986ae00 | 485 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
486 | } |
487 | ||
488 | case FUNCTION_TYPE: | |
489 | /* Function types: prefer the one that specified arg types. | |
490 | If both do, merge the arg types. Also merge the return types. */ | |
491 | { | |
492 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
493 | tree p1 = TYPE_ARG_TYPES (t1); | |
494 | tree p2 = TYPE_ARG_TYPES (t2); | |
495 | tree rval, raises; | |
496 | ||
497 | /* Save space: see if the result is identical to one of the args. */ | |
498 | if (valtype == TREE_TYPE (t1) && ! p2) | |
2986ae00 | 499 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 500 | if (valtype == TREE_TYPE (t2) && ! p1) |
2986ae00 | 501 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
502 | |
503 | /* Simple way if one arg fails to specify argument types. */ | |
504 | if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) | |
505 | { | |
506 | rval = build_function_type (valtype, p2); | |
8926095f | 507 | if ((raises = TYPE_RAISES_EXCEPTIONS (t2))) |
f30432d7 | 508 | rval = build_exception_variant (rval, raises); |
2986ae00 | 509 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
510 | } |
511 | raises = TYPE_RAISES_EXCEPTIONS (t1); | |
512 | if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) | |
513 | { | |
514 | rval = build_function_type (valtype, p1); | |
515 | if (raises) | |
f30432d7 | 516 | rval = build_exception_variant (rval, raises); |
2986ae00 | 517 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
518 | } |
519 | ||
520 | rval = build_function_type (valtype, commonparms (p1, p2)); | |
f30432d7 | 521 | rval = build_exception_variant (rval, raises); |
2986ae00 | 522 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
523 | } |
524 | ||
525 | case RECORD_TYPE: | |
526 | case UNION_TYPE: | |
527 | my_friendly_assert (TYPE_MAIN_VARIANT (t1) == t1 | |
528 | && TYPE_MAIN_VARIANT (t2) == t2, 306); | |
529 | ||
e1cd6e56 MS |
530 | if (DERIVED_FROM_P (t1, t2) && binfo_or_else (t1, t2)) |
531 | return build_type_attribute_variant (t1, attributes); | |
532 | else if (binfo_or_else (t2, t1)) | |
533 | return build_type_attribute_variant (t2, attributes); | |
534 | else | |
535 | compiler_error ("common_type called with uncommon aggregate types"); | |
8d08fdba MS |
536 | |
537 | case METHOD_TYPE: | |
71851aaa | 538 | if (TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) |
8d08fdba MS |
539 | { |
540 | /* Get this value the long way, since TYPE_METHOD_BASETYPE | |
541 | is just the main variant of this. */ | |
71851aaa | 542 | tree basetype; |
8d08fdba MS |
543 | tree raises, t3; |
544 | ||
71851aaa MS |
545 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
546 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
547 | ||
5566b478 MS |
548 | if (comptypes (b1, b2, 1) |
549 | || (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2))) | |
71851aaa MS |
550 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2))); |
551 | else | |
552 | { | |
553 | if (binfo_or_else (b2, b1) == NULL_TREE) | |
554 | compiler_error ("common_type called with uncommon method types"); | |
555 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1))); | |
556 | } | |
557 | ||
8d08fdba MS |
558 | raises = TYPE_RAISES_EXCEPTIONS (t1); |
559 | ||
560 | /* If this was a member function type, get back to the | |
561 | original type of type member function (i.e., without | |
562 | the class instance variable up front. */ | |
563 | t1 = build_function_type (TREE_TYPE (t1), TREE_CHAIN (TYPE_ARG_TYPES (t1))); | |
564 | t2 = build_function_type (TREE_TYPE (t2), TREE_CHAIN (TYPE_ARG_TYPES (t2))); | |
565 | t3 = common_type (t1, t2); | |
566 | t3 = build_cplus_method_type (basetype, TREE_TYPE (t3), TYPE_ARG_TYPES (t3)); | |
f30432d7 | 567 | t1 = build_exception_variant (t3, raises); |
8d08fdba | 568 | } |
2986ae00 MS |
569 | else |
570 | compiler_error ("common_type called with uncommon method types"); | |
571 | ||
572 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
573 | |
574 | case OFFSET_TYPE: | |
71851aaa | 575 | if (TREE_TYPE (t1) == TREE_TYPE (t2)) |
8d08fdba | 576 | { |
28cbf42c MS |
577 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
578 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
2986ae00 | 579 | |
e92cc029 MS |
580 | if (comptypes (b1, b2, 1) |
581 | || (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2))) | |
28cbf42c | 582 | return build_type_attribute_variant (t2, attributes); |
71851aaa MS |
583 | else if (binfo_or_else (b2, b1)) |
584 | return build_type_attribute_variant (t1, attributes); | |
28cbf42c MS |
585 | } |
586 | compiler_error ("common_type called with uncommon member types"); | |
8d08fdba MS |
587 | |
588 | default: | |
2986ae00 | 589 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
590 | } |
591 | } | |
592 | \f | |
593 | /* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */ | |
e92cc029 | 594 | |
8d08fdba | 595 | int |
5566b478 | 596 | compexcepttypes (t1, t2) |
8d08fdba | 597 | tree t1, t2; |
8d08fdba MS |
598 | { |
599 | return TYPE_RAISES_EXCEPTIONS (t1) == TYPE_RAISES_EXCEPTIONS (t2); | |
600 | } | |
601 | ||
602 | static int | |
603 | comp_array_types (cmp, t1, t2, strict) | |
49c249e1 | 604 | register int (*cmp) PROTO((tree, tree, int)); |
8d08fdba MS |
605 | tree t1, t2; |
606 | int strict; | |
607 | { | |
608 | tree d1 = TYPE_DOMAIN (t1); | |
609 | tree d2 = TYPE_DOMAIN (t2); | |
610 | ||
611 | /* Target types must match incl. qualifiers. */ | |
612 | if (!(TREE_TYPE (t1) == TREE_TYPE (t2) | |
613 | || (*cmp) (TREE_TYPE (t1), TREE_TYPE (t2), strict))) | |
614 | return 0; | |
615 | ||
616 | /* Sizes must match unless one is missing or variable. */ | |
617 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
618 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
619 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
620 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
621 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
622 | return 1; | |
623 | ||
624 | return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) | |
625 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) | |
626 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
627 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
628 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
629 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
630 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
631 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))); | |
632 | } | |
633 | ||
634 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
635 | or various other operations. This is what ANSI C++ speaks of as | |
636 | "being the same". | |
637 | ||
638 | For C++: argument STRICT says we should be strict about this | |
639 | comparison: | |
640 | ||
641 | 2 : strict, except that if one type is a reference and | |
642 | the other is not, compare the target type of the | |
643 | reference to the type that's not a reference (ARM, p308). | |
59be0cdd | 644 | This is used for checking for invalid overloading. |
8d08fdba | 645 | 1 : strict (compared according to ANSI C) |
a0a33927 | 646 | This is used for checking whether two function decls match. |
8d08fdba MS |
647 | 0 : <= (compared according to C++) |
648 | -1: <= or >= (relaxed) | |
649 | ||
650 | Otherwise, pointers involving base classes and derived classes | |
59be0cdd | 651 | can be mixed as valid: i.e. a pointer to a base class may be assigned |
8d08fdba MS |
652 | to a pointer to one of its derived classes, as per C++. A pointer to |
653 | a derived class may be passed as a parameter to a function expecting a | |
654 | pointer to a base classes. These allowances do not commute. In this | |
655 | case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to | |
656 | be the derived class. */ | |
e92cc029 | 657 | |
8d08fdba MS |
658 | int |
659 | comptypes (type1, type2, strict) | |
660 | tree type1, type2; | |
661 | int strict; | |
662 | { | |
663 | register tree t1 = type1; | |
664 | register tree t2 = type2; | |
2986ae00 | 665 | int attrval, val; |
8d08fdba MS |
666 | |
667 | /* Suppress errors caused by previously reported errors */ | |
668 | ||
669 | if (t1 == t2) | |
670 | return 1; | |
671 | ||
672 | /* This should never happen. */ | |
673 | my_friendly_assert (t1 != error_mark_node, 307); | |
674 | ||
675 | if (t2 == error_mark_node) | |
676 | return 0; | |
677 | ||
678 | if (strict < 0) | |
679 | { | |
680 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
681 | ||
682 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
683 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
684 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
685 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
8d08fdba | 686 | |
51c184be MS |
687 | if (t1 == t2) |
688 | return 1; | |
689 | } | |
8d08fdba | 690 | |
5566b478 MS |
691 | if (TYPE_PTRMEMFUNC_P (t1)) |
692 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
693 | if (TYPE_PTRMEMFUNC_P (t2)) | |
694 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
695 | ||
8d08fdba MS |
696 | /* Different classes of types can't be compatible. */ |
697 | ||
698 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
699 | { | |
700 | if (strict == 2 | |
701 | && ((TREE_CODE (t1) == REFERENCE_TYPE) | |
702 | ^ (TREE_CODE (t2) == REFERENCE_TYPE))) | |
703 | { | |
704 | if (TREE_CODE (t1) == REFERENCE_TYPE) | |
705 | return comptypes (TREE_TYPE (t1), t2, 1); | |
706 | return comptypes (t1, TREE_TYPE (t2), 1); | |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | if (strict > 1) | |
712 | strict = 1; | |
713 | ||
714 | /* Qualifiers must match. */ | |
715 | ||
716 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
717 | return 0; | |
a0a33927 | 718 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) |
8d08fdba MS |
719 | return 0; |
720 | ||
721 | /* Allow for two different type nodes which have essentially the same | |
722 | definition. Note that we already checked for equality of the type | |
723 | type qualifiers (just above). */ | |
724 | ||
725 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
726 | return 1; | |
727 | ||
cffa8729 MS |
728 | /* ??? COMP_TYPE_ATTRIBUTES is currently useless for variables as each |
729 | attribute is its own main variant (`val' will remain 0). */ | |
730 | #ifndef COMP_TYPE_ATTRIBUTES | |
731 | #define COMP_TYPE_ATTRIBUTES(t1,t2) 1 | |
732 | #endif | |
733 | ||
734 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
2986ae00 MS |
735 | if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) |
736 | return 0; | |
2986ae00 MS |
737 | |
738 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
739 | val = 0; | |
740 | ||
8d08fdba MS |
741 | switch (TREE_CODE (t1)) |
742 | { | |
743 | case RECORD_TYPE: | |
744 | case UNION_TYPE: | |
5566b478 MS |
745 | if (CLASSTYPE_TEMPLATE_INFO (t1) && CLASSTYPE_TEMPLATE_INFO (t2) |
746 | && CLASSTYPE_TI_TEMPLATE (t1) == CLASSTYPE_TI_TEMPLATE (t2)) | |
747 | { | |
748 | int i = TREE_VEC_LENGTH (CLASSTYPE_TI_ARGS (t1)); | |
749 | tree *p1 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t1), 0); | |
750 | tree *p2 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t2), 0); | |
751 | ||
752 | while (i--) | |
753 | { | |
754 | if (TREE_CODE_CLASS (TREE_CODE (p1[i])) == 't') | |
755 | { | |
756 | if (! comptypes (p1[i], p2[i], 1)) | |
757 | return 0; | |
758 | } | |
759 | else | |
760 | { | |
761 | if (simple_cst_equal (p1[i], p2[i]) <= 0) | |
762 | return 0; | |
763 | } | |
764 | } | |
765 | return 1; | |
766 | } | |
8d08fdba MS |
767 | if (strict <= 0) |
768 | goto look_hard; | |
769 | return 0; | |
770 | ||
771 | case OFFSET_TYPE: | |
f30432d7 MS |
772 | val = (comptypes (build_pointer_type (TYPE_OFFSET_BASETYPE (t1)), |
773 | build_pointer_type (TYPE_OFFSET_BASETYPE (t2)), strict) | |
774 | && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)); | |
2986ae00 | 775 | break; |
8d08fdba MS |
776 | |
777 | case METHOD_TYPE: | |
5566b478 | 778 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
779 | return 0; |
780 | ||
781 | /* This case is anti-symmetrical! | |
782 | One can pass a base member (or member function) | |
783 | to something expecting a derived member (or member function), | |
784 | but not vice-versa! */ | |
785 | ||
f30432d7 MS |
786 | val = (comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict) |
787 | && compparms (TYPE_ARG_TYPES (t1), | |
788 | TYPE_ARG_TYPES (t2), strict)); | |
2986ae00 MS |
789 | break; |
790 | ||
8d08fdba MS |
791 | case POINTER_TYPE: |
792 | case REFERENCE_TYPE: | |
793 | t1 = TREE_TYPE (t1); | |
794 | t2 = TREE_TYPE (t2); | |
795 | if (t1 == t2) | |
2986ae00 MS |
796 | { |
797 | val = 1; | |
798 | break; | |
799 | } | |
8d08fdba MS |
800 | if (strict <= 0) |
801 | { | |
802 | if (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE) | |
803 | { | |
804 | int rval; | |
805 | look_hard: | |
c73964b2 | 806 | rval = t1 == t2 || DERIVED_FROM_P (t1, t2); |
8d08fdba MS |
807 | |
808 | if (rval) | |
2986ae00 MS |
809 | { |
810 | val = 1; | |
811 | break; | |
812 | } | |
8d08fdba | 813 | if (strict < 0) |
2986ae00 | 814 | { |
c73964b2 | 815 | val = DERIVED_FROM_P (t2, t1); |
2986ae00 MS |
816 | break; |
817 | } | |
8d08fdba MS |
818 | } |
819 | return 0; | |
820 | } | |
821 | else | |
2986ae00 MS |
822 | val = comptypes (t1, t2, strict); |
823 | break; | |
8d08fdba MS |
824 | |
825 | case FUNCTION_TYPE: | |
5566b478 | 826 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
827 | return 0; |
828 | ||
2986ae00 MS |
829 | val = ((TREE_TYPE (t1) == TREE_TYPE (t2) |
830 | || comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)) | |
831 | && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); | |
832 | break; | |
8d08fdba MS |
833 | |
834 | case ARRAY_TYPE: | |
835 | /* Target types must match incl. qualifiers. */ | |
2986ae00 MS |
836 | val = comp_array_types (comptypes, t1, t2, strict); |
837 | break; | |
8d08fdba | 838 | |
51c184be | 839 | case TEMPLATE_TYPE_PARM: |
98c1c668 JM |
840 | return TEMPLATE_TYPE_IDX (t1) == TEMPLATE_TYPE_IDX (t2) |
841 | && TEMPLATE_TYPE_LEVEL (t1) == TEMPLATE_TYPE_LEVEL (t2); | |
e76a2646 MS |
842 | |
843 | case TYPENAME_TYPE: | |
844 | if (TYPE_IDENTIFIER (t1) != TYPE_IDENTIFIER (t2)) | |
845 | return 0; | |
846 | return comptypes (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2), 1); | |
8d08fdba | 847 | } |
2986ae00 | 848 | return attrval == 2 && val == 1 ? 2 : val; |
8d08fdba MS |
849 | } |
850 | ||
851 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
852 | ignoring their qualifiers. | |
853 | ||
854 | NPTRS is the number of pointers we can strip off and keep cool. | |
855 | This is used to permit (for aggr A, aggr B) A, B* to convert to A*, | |
856 | but to not permit B** to convert to A**. */ | |
857 | ||
858 | int | |
859 | comp_target_types (ttl, ttr, nptrs) | |
860 | tree ttl, ttr; | |
861 | int nptrs; | |
862 | { | |
863 | ttl = TYPE_MAIN_VARIANT (ttl); | |
864 | ttr = TYPE_MAIN_VARIANT (ttr); | |
865 | if (ttl == ttr) | |
866 | return 1; | |
867 | ||
868 | if (TREE_CODE (ttr) != TREE_CODE (ttl)) | |
869 | return 0; | |
870 | ||
871 | if (TREE_CODE (ttr) == POINTER_TYPE) | |
a0a33927 | 872 | { |
7215f9a0 MS |
873 | ttl = TREE_TYPE (ttl); |
874 | ttr = TREE_TYPE (ttr); | |
875 | ||
876 | if (nptrs > 0) | |
877 | { | |
a6967cc0 JM |
878 | if (TREE_CODE (ttl) == UNKNOWN_TYPE |
879 | || TREE_CODE (ttr) == UNKNOWN_TYPE) | |
880 | return 1; | |
881 | else if (TREE_CODE (ttl) == VOID_TYPE | |
7215f9a0 MS |
882 | && TREE_CODE (ttr) != FUNCTION_TYPE |
883 | && TREE_CODE (ttr) != METHOD_TYPE | |
884 | && TREE_CODE (ttr) != OFFSET_TYPE) | |
885 | return 1; | |
886 | else if (TREE_CODE (ttr) == VOID_TYPE | |
887 | && TREE_CODE (ttl) != FUNCTION_TYPE | |
888 | && TREE_CODE (ttl) != METHOD_TYPE | |
889 | && TREE_CODE (ttl) != OFFSET_TYPE) | |
890 | return -1; | |
71851aaa MS |
891 | else if (TREE_CODE (ttl) == POINTER_TYPE |
892 | || TREE_CODE (ttl) == ARRAY_TYPE) | |
07674418 MS |
893 | { |
894 | if (comp_ptr_ttypes (ttl, ttr)) | |
895 | return 1; | |
896 | else if (comp_ptr_ttypes (ttr, ttl)) | |
897 | return -1; | |
898 | return 0; | |
899 | } | |
7215f9a0 MS |
900 | } |
901 | ||
f30432d7 MS |
902 | /* Const and volatile mean something different for function types, |
903 | so the usual checks are not appropriate. */ | |
904 | if (TREE_CODE (ttl) == FUNCTION_TYPE || TREE_CODE (ttl) == METHOD_TYPE) | |
905 | return comp_target_types (ttl, ttr, nptrs - 1); | |
906 | ||
907 | /* Make sure that the cv-quals change only in the same direction as | |
908 | the target type. */ | |
909 | { | |
910 | int t; | |
911 | int c = TYPE_READONLY (ttl) - TYPE_READONLY (ttr); | |
912 | int v = TYPE_VOLATILE (ttl) - TYPE_VOLATILE (ttr); | |
913 | ||
914 | if ((c > 0 && v < 0) || (c < 0 && v > 0)) | |
915 | return 0; | |
916 | ||
917 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr)) | |
918 | return (c + v < 0) ? -1 : 1; | |
919 | ||
920 | t = comp_target_types (ttl, ttr, nptrs - 1); | |
921 | if ((t == 1 && c + v >= 0) || (t == -1 && c + v <= 0)) | |
922 | return t; | |
923 | ||
924 | return 0; | |
925 | } | |
a0a33927 | 926 | } |
8d08fdba MS |
927 | |
928 | if (TREE_CODE (ttr) == REFERENCE_TYPE) | |
929 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
930 | if (TREE_CODE (ttr) == ARRAY_TYPE) | |
931 | return comp_array_types (comp_target_types, ttl, ttr, 0); | |
932 | else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE) | |
933 | if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
8926095f | 934 | switch (comp_target_parms (TYPE_ARG_TYPES (ttl), TYPE_ARG_TYPES (ttr), 1)) |
8d08fdba MS |
935 | { |
936 | case 0: | |
937 | return 0; | |
938 | case 1: | |
939 | return 1; | |
940 | case 2: | |
e1cd6e56 | 941 | return -1; |
8d08fdba MS |
942 | default: |
943 | my_friendly_abort (112); | |
944 | } | |
945 | else | |
946 | return 0; | |
947 | ||
948 | /* for C++ */ | |
949 | else if (TREE_CODE (ttr) == OFFSET_TYPE) | |
950 | { | |
951 | /* Contravariance: we can assign a pointer to base member to a pointer | |
952 | to derived member. Note difference from simple pointer case, where | |
953 | we can pass a pointer to derived to a pointer to base. */ | |
954 | if (comptypes (TYPE_OFFSET_BASETYPE (ttr), TYPE_OFFSET_BASETYPE (ttl), 0)) | |
955 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
956 | else if (comptypes (TYPE_OFFSET_BASETYPE (ttl), TYPE_OFFSET_BASETYPE (ttr), 0) | |
957 | && comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
e1cd6e56 | 958 | return -1; |
8d08fdba MS |
959 | } |
960 | else if (IS_AGGR_TYPE (ttl)) | |
961 | { | |
962 | if (nptrs < 0) | |
963 | return 0; | |
f30432d7 | 964 | if (comptypes (build_pointer_type (ttl), build_pointer_type (ttr), 0)) |
e1cd6e56 | 965 | return 1; |
f30432d7 | 966 | if (comptypes (build_pointer_type (ttr), build_pointer_type (ttl), 0)) |
e1cd6e56 MS |
967 | return -1; |
968 | return 0; | |
8d08fdba MS |
969 | } |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
974 | /* If two types share a common base type, return that basetype. | |
975 | If there is not a unique most-derived base type, this function | |
976 | returns ERROR_MARK_NODE. */ | |
e92cc029 | 977 | |
bd6dd845 | 978 | static tree |
8d08fdba MS |
979 | common_base_type (tt1, tt2) |
980 | tree tt1, tt2; | |
981 | { | |
5566b478 | 982 | tree best = NULL_TREE; |
8d08fdba MS |
983 | int i; |
984 | ||
985 | /* If one is a baseclass of another, that's good enough. */ | |
986 | if (UNIQUELY_DERIVED_FROM_P (tt1, tt2)) | |
987 | return tt1; | |
988 | if (UNIQUELY_DERIVED_FROM_P (tt2, tt1)) | |
989 | return tt2; | |
990 | ||
8d08fdba MS |
991 | /* Otherwise, try to find a unique baseclass of TT1 |
992 | that is shared by TT2, and follow that down. */ | |
993 | for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--) | |
994 | { | |
995 | tree basetype = TYPE_BINFO_BASETYPE (tt1, i); | |
996 | tree trial = common_base_type (basetype, tt2); | |
997 | if (trial) | |
998 | { | |
999 | if (trial == error_mark_node) | |
1000 | return trial; | |
1001 | if (best == NULL_TREE) | |
1002 | best = trial; | |
1003 | else if (best != trial) | |
1004 | return error_mark_node; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* Same for TT2. */ | |
1009 | for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--) | |
1010 | { | |
1011 | tree basetype = TYPE_BINFO_BASETYPE (tt2, i); | |
1012 | tree trial = common_base_type (tt1, basetype); | |
1013 | if (trial) | |
1014 | { | |
1015 | if (trial == error_mark_node) | |
1016 | return trial; | |
1017 | if (best == NULL_TREE) | |
1018 | best = trial; | |
1019 | else if (best != trial) | |
1020 | return error_mark_node; | |
1021 | } | |
1022 | } | |
1023 | return best; | |
1024 | } | |
1025 | \f | |
1026 | /* Subroutines of `comptypes'. */ | |
1027 | ||
1028 | /* Return 1 if two parameter type lists PARMS1 and PARMS2 | |
1029 | are equivalent in the sense that functions with those parameter types | |
1030 | can have equivalent types. | |
1031 | If either list is empty, we win. | |
1032 | Otherwise, the two lists must be equivalent, element by element. | |
1033 | ||
1034 | C++: See comment above about TYPE1, TYPE2, STRICT. | |
1035 | If STRICT == 3, it means checking is strict, but do not compare | |
1036 | default parameter values. */ | |
e92cc029 | 1037 | |
8d08fdba MS |
1038 | int |
1039 | compparms (parms1, parms2, strict) | |
1040 | tree parms1, parms2; | |
1041 | int strict; | |
1042 | { | |
1043 | register tree t1 = parms1, t2 = parms2; | |
1044 | ||
1045 | /* An unspecified parmlist matches any specified parmlist | |
1046 | whose argument types don't need default promotions. */ | |
1047 | ||
8926095f MS |
1048 | if (strict <= 0 && t1 == 0) |
1049 | return self_promoting_args_p (t2); | |
1050 | if (strict < 0 && t2 == 0) | |
1051 | return self_promoting_args_p (t1); | |
8d08fdba MS |
1052 | |
1053 | while (1) | |
1054 | { | |
1055 | if (t1 == 0 && t2 == 0) | |
1056 | return 1; | |
1057 | /* If one parmlist is shorter than the other, | |
1058 | they fail to match, unless STRICT is <= 0. */ | |
1059 | if (t1 == 0 || t2 == 0) | |
1060 | { | |
1061 | if (strict > 0) | |
1062 | return 0; | |
1063 | if (strict < 0) | |
1064 | return 1; | |
1065 | if (strict == 0) | |
1066 | return t1 && TREE_PURPOSE (t1); | |
1067 | } | |
1068 | if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict)) | |
1069 | { | |
1070 | if (strict > 0) | |
1071 | return 0; | |
1072 | if (strict == 0) | |
1073 | return t2 == void_list_node && TREE_PURPOSE (t1); | |
1074 | return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); | |
1075 | } | |
8d08fdba MS |
1076 | |
1077 | t1 = TREE_CHAIN (t1); | |
1078 | t2 = TREE_CHAIN (t2); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* This really wants return whether or not parameter type lists | |
1083 | would make their owning functions assignment compatible or not. */ | |
e92cc029 | 1084 | |
bd6dd845 | 1085 | static int |
8d08fdba MS |
1086 | comp_target_parms (parms1, parms2, strict) |
1087 | tree parms1, parms2; | |
1088 | int strict; | |
1089 | { | |
1090 | register tree t1 = parms1, t2 = parms2; | |
1091 | int warn_contravariance = 0; | |
1092 | ||
1093 | /* An unspecified parmlist matches any specified parmlist | |
1094 | whose argument types don't need default promotions. | |
1095 | @@@ see 13.3.3 for a counterexample... */ | |
1096 | ||
1097 | if (t1 == 0 && t2 != 0) | |
1098 | { | |
1099 | cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'", | |
1100 | parms2); | |
1101 | return self_promoting_args_p (t2); | |
1102 | } | |
1103 | if (t2 == 0) | |
1104 | return self_promoting_args_p (t1); | |
1105 | ||
1106 | for (; t1 || t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) | |
1107 | { | |
1108 | tree p1, p2; | |
1109 | ||
1110 | /* If one parmlist is shorter than the other, | |
1111 | they fail to match, unless STRICT is <= 0. */ | |
1112 | if (t1 == 0 || t2 == 0) | |
1113 | { | |
1114 | if (strict > 0) | |
1115 | return 0; | |
1116 | if (strict < 0) | |
1117 | return 1 + warn_contravariance; | |
1118 | return ((t1 && TREE_PURPOSE (t1)) + warn_contravariance); | |
1119 | } | |
1120 | p1 = TREE_VALUE (t1); | |
1121 | p2 = TREE_VALUE (t2); | |
1122 | if (p1 == p2) | |
1123 | continue; | |
7177d104 | 1124 | |
8d08fdba MS |
1125 | if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE) |
1126 | || (TREE_CODE (p1) == REFERENCE_TYPE && TREE_CODE (p2) == REFERENCE_TYPE)) | |
1127 | { | |
1128 | if (strict <= 0 | |
1129 | && (TYPE_MAIN_VARIANT (TREE_TYPE (p1)) | |
1130 | == TYPE_MAIN_VARIANT (TREE_TYPE (p2)))) | |
1131 | continue; | |
1132 | ||
1133 | /* The following is wrong for contravariance, | |
1134 | but many programs depend on it. */ | |
1135 | if (TREE_TYPE (p1) == void_type_node) | |
1136 | continue; | |
1137 | if (TREE_TYPE (p2) == void_type_node) | |
1138 | { | |
1139 | warn_contravariance = 1; | |
1140 | continue; | |
1141 | } | |
1142 | if (IS_AGGR_TYPE (TREE_TYPE (p1))) | |
1143 | { | |
1144 | if (comptypes (p2, p1, 0) == 0) | |
1145 | { | |
1146 | if (comptypes (p1, p2, 0) != 0) | |
1147 | warn_contravariance = 1; | |
1148 | else | |
1149 | return 0; | |
1150 | } | |
1151 | continue; | |
1152 | } | |
1153 | } | |
1154 | /* Note backwards order due to contravariance. */ | |
1155 | if (comp_target_types (p2, p1, 1) == 0) | |
1156 | { | |
1157 | if (comp_target_types (p1, p2, 1)) | |
1158 | { | |
1159 | warn_contravariance = 1; | |
1160 | continue; | |
1161 | } | |
1162 | if (strict != 0) | |
1163 | return 0; | |
8d08fdba MS |
1164 | } |
1165 | /* Target types are compatible--just make sure that if | |
1166 | we use parameter lists, that they are ok as well. */ | |
1167 | if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE) | |
1168 | switch (comp_target_parms (TYPE_ARG_TYPES (p1), | |
1169 | TYPE_ARG_TYPES (p2), | |
1170 | strict)) | |
1171 | { | |
1172 | case 0: | |
1173 | return 0; | |
1174 | case 1: | |
1175 | break; | |
1176 | case 2: | |
1177 | warn_contravariance = 1; | |
1178 | } | |
1179 | ||
1180 | if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) | |
1181 | { | |
1182 | int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); | |
1183 | if (cmp < 0) | |
1184 | my_friendly_abort (114); | |
1185 | if (cmp == 0) | |
1186 | return 0; | |
1187 | } | |
1188 | } | |
1189 | return 1 + warn_contravariance; | |
1190 | } | |
1191 | ||
1192 | /* Return 1 if PARMS specifies a fixed number of parameters | |
1193 | and none of their types is affected by default promotions. */ | |
1194 | ||
8926095f | 1195 | int |
8d08fdba MS |
1196 | self_promoting_args_p (parms) |
1197 | tree parms; | |
1198 | { | |
1199 | register tree t; | |
1200 | for (t = parms; t; t = TREE_CHAIN (t)) | |
1201 | { | |
1202 | register tree type = TREE_VALUE (t); | |
1203 | ||
1204 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
1205 | return 0; | |
1206 | ||
cffa8729 | 1207 | if (type == 0) |
8d08fdba MS |
1208 | return 0; |
1209 | ||
cffa8729 | 1210 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
8d08fdba MS |
1211 | return 0; |
1212 | ||
1213 | if (C_PROMOTING_INTEGER_TYPE_P (type)) | |
1214 | return 0; | |
1215 | } | |
1216 | return 1; | |
1217 | } | |
1218 | \f | |
1219 | /* Return an unsigned type the same as TYPE in other respects. | |
1220 | ||
1221 | C++: must make these work for type variants as well. */ | |
1222 | ||
1223 | tree | |
1224 | unsigned_type (type) | |
1225 | tree type; | |
1226 | { | |
1227 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1228 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1229 | return unsigned_char_type_node; | |
1230 | if (type1 == integer_type_node) | |
1231 | return unsigned_type_node; | |
1232 | if (type1 == short_integer_type_node) | |
1233 | return short_unsigned_type_node; | |
1234 | if (type1 == long_integer_type_node) | |
1235 | return long_unsigned_type_node; | |
1236 | if (type1 == long_long_integer_type_node) | |
1237 | return long_long_unsigned_type_node; | |
cffa8729 MS |
1238 | if (type1 == intDI_type_node) |
1239 | return unsigned_intDI_type_node; | |
1240 | if (type1 == intSI_type_node) | |
1241 | return unsigned_intSI_type_node; | |
1242 | if (type1 == intHI_type_node) | |
1243 | return unsigned_intHI_type_node; | |
1244 | if (type1 == intQI_type_node) | |
1245 | return unsigned_intQI_type_node; | |
691c003d MS |
1246 | |
1247 | return signed_or_unsigned_type (1, type); | |
8d08fdba MS |
1248 | } |
1249 | ||
1250 | /* Return a signed type the same as TYPE in other respects. */ | |
1251 | ||
1252 | tree | |
1253 | signed_type (type) | |
1254 | tree type; | |
1255 | { | |
1256 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1257 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1258 | return signed_char_type_node; | |
1259 | if (type1 == unsigned_type_node) | |
1260 | return integer_type_node; | |
1261 | if (type1 == short_unsigned_type_node) | |
1262 | return short_integer_type_node; | |
1263 | if (type1 == long_unsigned_type_node) | |
1264 | return long_integer_type_node; | |
1265 | if (type1 == long_long_unsigned_type_node) | |
1266 | return long_long_integer_type_node; | |
cffa8729 MS |
1267 | if (type1 == unsigned_intDI_type_node) |
1268 | return intDI_type_node; | |
1269 | if (type1 == unsigned_intSI_type_node) | |
1270 | return intSI_type_node; | |
1271 | if (type1 == unsigned_intHI_type_node) | |
1272 | return intHI_type_node; | |
1273 | if (type1 == unsigned_intQI_type_node) | |
1274 | return intQI_type_node; | |
691c003d MS |
1275 | |
1276 | return signed_or_unsigned_type (0, type); | |
8d08fdba MS |
1277 | } |
1278 | ||
1279 | /* Return a type the same as TYPE except unsigned or | |
1280 | signed according to UNSIGNEDP. */ | |
1281 | ||
1282 | tree | |
1283 | signed_or_unsigned_type (unsignedp, type) | |
1284 | int unsignedp; | |
1285 | tree type; | |
1286 | { | |
691c003d MS |
1287 | if (! INTEGRAL_TYPE_P (type) |
1288 | || TREE_UNSIGNED (type) == unsignedp) | |
8d08fdba | 1289 | return type; |
691c003d | 1290 | |
8d08fdba MS |
1291 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) |
1292 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1293 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
1294 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1295 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
1296 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1297 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
1298 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1299 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
1300 | return (unsignedp ? long_long_unsigned_type_node | |
1301 | : long_long_integer_type_node); | |
1302 | return type; | |
1303 | } | |
1304 | ||
cffa8729 MS |
1305 | /* Compute the value of the `sizeof' operator. */ |
1306 | ||
8d08fdba MS |
1307 | tree |
1308 | c_sizeof (type) | |
1309 | tree type; | |
1310 | { | |
1311 | enum tree_code code = TREE_CODE (type); | |
1312 | tree t; | |
1313 | ||
5156628f | 1314 | if (processing_template_decl) |
5566b478 MS |
1315 | return build_min (SIZEOF_EXPR, sizetype, type); |
1316 | ||
8d08fdba MS |
1317 | if (code == FUNCTION_TYPE) |
1318 | { | |
1319 | if (pedantic || warn_pointer_arith) | |
1320 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1321 | return size_int (1); | |
1322 | } | |
1323 | if (code == METHOD_TYPE) | |
1324 | { | |
1325 | if (pedantic || warn_pointer_arith) | |
1326 | pedwarn ("ANSI C++ forbids taking the sizeof a method type"); | |
1327 | return size_int (1); | |
1328 | } | |
1329 | if (code == VOID_TYPE) | |
1330 | { | |
1331 | if (pedantic || warn_pointer_arith) | |
1332 | pedwarn ("ANSI C++ forbids taking the sizeof a void type"); | |
1333 | return size_int (1); | |
1334 | } | |
1335 | if (code == ERROR_MARK) | |
1336 | return size_int (1); | |
1337 | ||
1338 | /* ARM $5.3.2: ``When applied to a reference, the result is the size of the | |
1339 | referenced object.'' */ | |
1340 | if (code == REFERENCE_TYPE) | |
1341 | type = TREE_TYPE (type); | |
1342 | ||
1343 | /* We couldn't find anything in the ARM or the draft standard that says, | |
1344 | one way or the other, if doing sizeof on something that doesn't have | |
1345 | an object associated with it is correct or incorrect. For example, if | |
1346 | you declare `struct S { char str[16]; };', and in your program do | |
1347 | a `sizeof (S::str)', should we flag that as an error or should we give | |
1348 | the size of it? Since it seems like a reasonable thing to do, we'll go | |
1349 | with giving the value. */ | |
1350 | if (code == OFFSET_TYPE) | |
1351 | type = TREE_TYPE (type); | |
1352 | ||
1353 | /* @@ This also produces an error for a signature ref. | |
1354 | In that case we should be able to do better. */ | |
1355 | if (IS_SIGNATURE (type)) | |
1356 | { | |
1357 | error ("`sizeof' applied to a signature type"); | |
1358 | return size_int (0); | |
1359 | } | |
1360 | ||
5566b478 | 1361 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba | 1362 | { |
5566b478 | 1363 | cp_error ("`sizeof' applied to incomplete type `%T'", type); |
8d08fdba MS |
1364 | return size_int (0); |
1365 | } | |
1366 | ||
1367 | /* Convert in case a char is more than one unit. */ | |
1368 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
1369 | size_int (TYPE_PRECISION (char_type_node))); | |
1370 | /* size_binop does not put the constant in range, so do it now. */ | |
1371 | if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) | |
1372 | TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; | |
1373 | return t; | |
1374 | } | |
1375 | ||
5566b478 MS |
1376 | tree |
1377 | expr_sizeof (e) | |
1378 | tree e; | |
1379 | { | |
5156628f | 1380 | if (processing_template_decl) |
5566b478 MS |
1381 | return build_min (SIZEOF_EXPR, sizetype, e); |
1382 | ||
1383 | if (TREE_CODE (e) == COMPONENT_REF | |
1384 | && DECL_BIT_FIELD (TREE_OPERAND (e, 1))) | |
1385 | error ("sizeof applied to a bit-field"); | |
1386 | /* ANSI says arrays and functions are converted inside comma. | |
1387 | But we can't really convert them in build_compound_expr | |
1388 | because that would break commas in lvalues. | |
1389 | So do the conversion here if operand was a comma. */ | |
1390 | if (TREE_CODE (e) == COMPOUND_EXPR | |
1391 | && (TREE_CODE (TREE_TYPE (e)) == ARRAY_TYPE | |
1392 | || TREE_CODE (TREE_TYPE (e)) == FUNCTION_TYPE)) | |
1393 | e = default_conversion (e); | |
1394 | else if (TREE_CODE (e) == TREE_LIST) | |
1395 | { | |
1396 | tree t = TREE_VALUE (e); | |
1397 | if (t != NULL_TREE | |
1398 | && ((TREE_TYPE (t) | |
1399 | && TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE) | |
1400 | || is_overloaded_fn (t))) | |
1401 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1402 | } | |
1403 | return c_sizeof (TREE_TYPE (e)); | |
1404 | } | |
1405 | ||
8d08fdba MS |
1406 | tree |
1407 | c_sizeof_nowarn (type) | |
1408 | tree type; | |
1409 | { | |
1410 | enum tree_code code = TREE_CODE (type); | |
1411 | tree t; | |
1412 | ||
1413 | if (code == FUNCTION_TYPE | |
1414 | || code == METHOD_TYPE | |
1415 | || code == VOID_TYPE | |
1416 | || code == ERROR_MARK) | |
1417 | return size_int (1); | |
1418 | if (code == REFERENCE_TYPE) | |
1419 | type = TREE_TYPE (type); | |
1420 | ||
1421 | if (TYPE_SIZE (type) == 0) | |
9e9ff709 | 1422 | return size_int (0); |
8d08fdba MS |
1423 | |
1424 | /* Convert in case a char is more than one unit. */ | |
1425 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
e1cd6e56 | 1426 | size_int (TYPE_PRECISION (char_type_node))); |
8d08fdba MS |
1427 | force_fit_type (t, 0); |
1428 | return t; | |
1429 | } | |
1430 | ||
1431 | /* Implement the __alignof keyword: Return the minimum required | |
1432 | alignment of TYPE, measured in bytes. */ | |
1433 | ||
1434 | tree | |
1435 | c_alignof (type) | |
1436 | tree type; | |
1437 | { | |
1438 | enum tree_code code = TREE_CODE (type); | |
1439 | tree t; | |
1440 | ||
1441 | if (code == FUNCTION_TYPE || code == METHOD_TYPE) | |
1442 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
1443 | ||
1444 | if (code == VOID_TYPE || code == ERROR_MARK) | |
1445 | return size_int (1); | |
1446 | ||
1447 | /* C++: this is really correct! */ | |
1448 | if (code == REFERENCE_TYPE) | |
1449 | type = TREE_TYPE (type); | |
1450 | ||
1451 | /* @@ This also produces an error for a signature ref. | |
1452 | In that case we should be able to do better. */ | |
1453 | if (IS_SIGNATURE (type)) | |
1454 | { | |
1455 | error ("`__alignof' applied to a signature type"); | |
1456 | return size_int (1); | |
1457 | } | |
1458 | ||
1459 | t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
1460 | force_fit_type (t, 0); | |
1461 | return t; | |
1462 | } | |
1463 | \f | |
1464 | /* Perform default promotions for C data used in expressions. | |
1465 | Arrays and functions are converted to pointers; | |
1466 | enumeral types or short or char, to int. | |
1467 | In addition, manifest constants symbols are replaced by their values. | |
1468 | ||
1469 | C++: this will automatically bash references to their target type. */ | |
1470 | ||
1471 | tree | |
a9aedbc2 | 1472 | decay_conversion (exp) |
8d08fdba MS |
1473 | tree exp; |
1474 | { | |
1475 | register tree type = TREE_TYPE (exp); | |
1476 | register enum tree_code code = TREE_CODE (type); | |
1477 | ||
ce122a86 | 1478 | if (code == OFFSET_TYPE) |
8d08fdba MS |
1479 | { |
1480 | if (TREE_CODE (exp) == OFFSET_REF) | |
a9aedbc2 | 1481 | return decay_conversion (resolve_offset_ref (exp)); |
8d08fdba MS |
1482 | |
1483 | type = TREE_TYPE (type); | |
1484 | code = TREE_CODE (type); | |
691c003d MS |
1485 | |
1486 | if (type == unknown_type_node) | |
1487 | { | |
1488 | cp_pedwarn ("assuming & on overloaded member function"); | |
1489 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1490 | } | |
8d08fdba MS |
1491 | } |
1492 | ||
1493 | if (code == REFERENCE_TYPE) | |
1494 | { | |
1495 | exp = convert_from_reference (exp); | |
1496 | type = TREE_TYPE (exp); | |
1497 | code = TREE_CODE (type); | |
1498 | } | |
1499 | ||
1500 | /* Constants can be used directly unless they're not loadable. */ | |
1501 | if (TREE_CODE (exp) == CONST_DECL) | |
1502 | exp = DECL_INITIAL (exp); | |
1503 | /* Replace a nonvolatile const static variable with its value. */ | |
fd378c9d | 1504 | else if (TREE_READONLY_DECL_P (exp)) |
8d08fdba MS |
1505 | { |
1506 | exp = decl_constant_value (exp); | |
1507 | type = TREE_TYPE (exp); | |
1508 | } | |
1509 | ||
1510 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
1511 | Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ | |
1512 | ||
8d08fdba MS |
1513 | if (code == VOID_TYPE) |
1514 | { | |
1515 | error ("void value not ignored as it ought to be"); | |
1516 | return error_mark_node; | |
1517 | } | |
1518 | if (code == FUNCTION_TYPE) | |
1519 | { | |
1520 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1521 | } | |
1522 | if (code == METHOD_TYPE) | |
1523 | { | |
4ac14744 | 1524 | cp_pedwarn ("assuming & on `%E'", exp); |
8d08fdba MS |
1525 | return build_unary_op (ADDR_EXPR, exp, 0); |
1526 | } | |
1527 | if (code == ARRAY_TYPE) | |
1528 | { | |
1529 | register tree adr; | |
1530 | tree restype; | |
1531 | tree ptrtype; | |
1532 | int constp, volatilep; | |
1533 | ||
1534 | if (TREE_CODE (exp) == INDIRECT_REF) | |
1535 | { | |
1536 | /* Stripping away the INDIRECT_REF is not the right | |
1537 | thing to do for references... */ | |
1538 | tree inner = TREE_OPERAND (exp, 0); | |
1539 | if (TREE_CODE (TREE_TYPE (inner)) == REFERENCE_TYPE) | |
1540 | { | |
1541 | inner = build1 (CONVERT_EXPR, | |
1542 | build_pointer_type (TREE_TYPE (TREE_TYPE (inner))), | |
1543 | inner); | |
eb66be0e | 1544 | TREE_CONSTANT (inner) = TREE_CONSTANT (TREE_OPERAND (inner, 0)); |
8d08fdba | 1545 | } |
37c46b43 | 1546 | return cp_convert (build_pointer_type (TREE_TYPE (type)), inner); |
8d08fdba MS |
1547 | } |
1548 | ||
1549 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
1550 | { | |
a9aedbc2 | 1551 | tree op1 = decay_conversion (TREE_OPERAND (exp, 1)); |
8d08fdba MS |
1552 | return build (COMPOUND_EXPR, TREE_TYPE (op1), |
1553 | TREE_OPERAND (exp, 0), op1); | |
1554 | } | |
1555 | ||
1556 | if (!lvalue_p (exp) | |
1557 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) | |
1558 | { | |
1559 | error ("invalid use of non-lvalue array"); | |
1560 | return error_mark_node; | |
1561 | } | |
1562 | ||
1563 | constp = volatilep = 0; | |
1564 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' | |
1565 | || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
1566 | { | |
1567 | constp = TREE_READONLY (exp); | |
1568 | volatilep = TREE_THIS_VOLATILE (exp); | |
1569 | } | |
1570 | ||
1571 | restype = TREE_TYPE (type); | |
1572 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type) | |
1573 | || constp || volatilep) | |
f376e137 | 1574 | restype = cp_build_type_variant (restype, |
21474714 MS |
1575 | TYPE_READONLY (type) || constp, |
1576 | TYPE_VOLATILE (type) || volatilep); | |
8d08fdba MS |
1577 | ptrtype = build_pointer_type (restype); |
1578 | ||
1579 | if (TREE_CODE (exp) == VAR_DECL) | |
1580 | { | |
1581 | /* ??? This is not really quite correct | |
1582 | in that the type of the operand of ADDR_EXPR | |
1583 | is not the target type of the type of the ADDR_EXPR itself. | |
1584 | Question is, can this lossage be avoided? */ | |
1585 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1586 | if (mark_addressable (exp) == 0) | |
1587 | return error_mark_node; | |
1588 | TREE_CONSTANT (adr) = staticp (exp); | |
1589 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1590 | return adr; | |
1591 | } | |
1592 | /* This way is better for a COMPONENT_REF since it can | |
1593 | simplify the offset for a component. */ | |
1594 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
37c46b43 | 1595 | return cp_convert (ptrtype, adr); |
8d08fdba | 1596 | } |
a9aedbc2 MS |
1597 | |
1598 | return exp; | |
1599 | } | |
1600 | ||
1601 | tree | |
1602 | default_conversion (exp) | |
1603 | tree exp; | |
1604 | { | |
1605 | tree type; | |
1606 | enum tree_code code; | |
1607 | ||
1608 | exp = decay_conversion (exp); | |
1609 | ||
1610 | type = TREE_TYPE (exp); | |
1611 | code = TREE_CODE (type); | |
1612 | ||
1613 | if (INTEGRAL_CODE_P (code)) | |
1614 | { | |
1615 | tree t = type_promotes_to (type); | |
1616 | if (t != type) | |
37c46b43 | 1617 | return cp_convert (t, exp); |
a9aedbc2 | 1618 | } |
a9aedbc2 | 1619 | |
8d08fdba MS |
1620 | return exp; |
1621 | } | |
6b5fbb55 MS |
1622 | |
1623 | /* Take the address of an inline function without setting TREE_ADDRESSABLE | |
1624 | or TREE_USED. */ | |
1625 | ||
1626 | tree | |
1627 | inline_conversion (exp) | |
1628 | tree exp; | |
1629 | { | |
1630 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
1631 | { | |
1632 | tree type = build_type_variant | |
1633 | (TREE_TYPE (exp), TREE_READONLY (exp), TREE_THIS_VOLATILE (exp)); | |
1634 | exp = build1 (ADDR_EXPR, build_pointer_type (type), exp); | |
1635 | } | |
1636 | return exp; | |
1637 | } | |
8d08fdba MS |
1638 | \f |
1639 | tree | |
1640 | build_object_ref (datum, basetype, field) | |
1641 | tree datum, basetype, field; | |
1642 | { | |
a292b002 | 1643 | tree dtype; |
8d08fdba MS |
1644 | if (datum == error_mark_node) |
1645 | return error_mark_node; | |
a292b002 MS |
1646 | |
1647 | dtype = TREE_TYPE (datum); | |
1648 | if (TREE_CODE (dtype) == REFERENCE_TYPE) | |
1649 | dtype = TREE_TYPE (dtype); | |
1650 | if (! IS_AGGR_TYPE_CODE (TREE_CODE (dtype))) | |
1651 | { | |
1652 | cp_error ("request for member `%T::%D' in expression of non-aggregate type `%T'", | |
1653 | basetype, field, dtype); | |
1654 | return error_mark_node; | |
1655 | } | |
be99da77 | 1656 | else if (IS_SIGNATURE (basetype)) |
8d08fdba MS |
1657 | { |
1658 | warning ("signature name in scope resolution ignored"); | |
1659 | return build_component_ref (datum, field, NULL_TREE, 1); | |
1660 | } | |
be99da77 | 1661 | else if (is_aggr_type (basetype, 1)) |
8d08fdba | 1662 | { |
45537677 | 1663 | tree binfo = binfo_or_else (basetype, dtype); |
a4443a08 | 1664 | if (binfo) |
5156628f MS |
1665 | return build_x_component_ref (build_scoped_ref (datum, basetype), |
1666 | field, binfo, 1); | |
8d08fdba MS |
1667 | } |
1668 | return error_mark_node; | |
1669 | } | |
1670 | ||
42976354 BK |
1671 | /* Like `build_component_ref, but uses an already found field, and converts |
1672 | from a reference. Must compute access for current_class_ref. | |
1673 | Otherwise, ok. */ | |
e92cc029 | 1674 | |
8d08fdba MS |
1675 | tree |
1676 | build_component_ref_1 (datum, field, protect) | |
1677 | tree datum, field; | |
1678 | int protect; | |
1679 | { | |
42976354 BK |
1680 | return convert_from_reference |
1681 | (build_component_ref (datum, field, NULL_TREE, protect)); | |
8d08fdba MS |
1682 | } |
1683 | ||
1684 | /* Given a COND_EXPR in T, return it in a form that we can, for | |
1685 | example, use as an lvalue. This code used to be in unary_complex_lvalue, | |
1686 | but we needed it to deal with `a = (d == c) ? b : c' expressions, where | |
1687 | we're dealing with aggregates. So, we now call this in unary_complex_lvalue, | |
1688 | and in build_modify_expr. The case (in particular) that led to this was | |
1689 | with CODE == ADDR_EXPR, since it's not an lvalue when we'd get it there. */ | |
e92cc029 | 1690 | |
8d08fdba MS |
1691 | static tree |
1692 | rationalize_conditional_expr (code, t) | |
1693 | enum tree_code code; | |
1694 | tree t; | |
1695 | { | |
1696 | return | |
1697 | build_conditional_expr (TREE_OPERAND (t, 0), | |
1698 | build_unary_op (code, TREE_OPERAND (t, 1), 0), | |
1699 | build_unary_op (code, TREE_OPERAND (t, 2), 0)); | |
1700 | } | |
1701 | ||
9e9ff709 MS |
1702 | /* Given the TYPE of an anonymous union field inside T, return the |
1703 | FIELD_DECL for the field. If not found return NULL_TREE. Because | |
1704 | anonymous unions can nest, we must also search all anonymous unions | |
1705 | that are directly reachable. */ | |
e92cc029 | 1706 | |
9e9ff709 MS |
1707 | static tree |
1708 | lookup_anon_field (t, type) | |
1709 | tree t, type; | |
1710 | { | |
1711 | tree field; | |
1712 | ||
1713 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
1714 | { | |
1715 | if (TREE_STATIC (field)) | |
1716 | continue; | |
1717 | if (TREE_CODE (field) != FIELD_DECL) | |
1718 | continue; | |
1719 | ||
1720 | /* If we find it directly, return the field. */ | |
1721 | if (DECL_NAME (field) == NULL_TREE | |
1722 | && type == TREE_TYPE (field)) | |
1723 | { | |
1724 | return field; | |
1725 | } | |
1726 | ||
1727 | /* Otherwise, it could be nested, search harder. */ | |
1728 | if (DECL_NAME (field) == NULL_TREE | |
1729 | && TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
1730 | { | |
1731 | tree subfield = lookup_anon_field (TREE_TYPE (field), type); | |
1732 | if (subfield) | |
1733 | return subfield; | |
1734 | } | |
1735 | } | |
1736 | return NULL_TREE; | |
1737 | } | |
1738 | ||
1739 | /* Build a COMPONENT_REF for a given DATUM, and it's member COMPONENT. | |
1740 | COMPONENT can be an IDENTIFIER_NODE that is the name of the member | |
1741 | that we are interested in, or it can be a FIELD_DECL. */ | |
e92cc029 | 1742 | |
8d08fdba MS |
1743 | tree |
1744 | build_component_ref (datum, component, basetype_path, protect) | |
1745 | tree datum, component, basetype_path; | |
1746 | int protect; | |
1747 | { | |
1748 | register tree basetype = TREE_TYPE (datum); | |
5566b478 | 1749 | register enum tree_code code; |
8d08fdba MS |
1750 | register tree field = NULL; |
1751 | register tree ref; | |
1752 | ||
5156628f | 1753 | if (processing_template_decl) |
5566b478 MS |
1754 | return build_min_nt (COMPONENT_REF, datum, component); |
1755 | ||
e92cc029 MS |
1756 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference |
1757 | inside it. */ | |
8d08fdba MS |
1758 | switch (TREE_CODE (datum)) |
1759 | { | |
1760 | case COMPOUND_EXPR: | |
1761 | { | |
1762 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component, | |
1763 | basetype_path, protect); | |
1764 | return build (COMPOUND_EXPR, TREE_TYPE (value), | |
1765 | TREE_OPERAND (datum, 0), value); | |
1766 | } | |
1767 | case COND_EXPR: | |
1768 | return build_conditional_expr | |
1769 | (TREE_OPERAND (datum, 0), | |
1770 | build_component_ref (TREE_OPERAND (datum, 1), component, | |
1771 | basetype_path, protect), | |
1772 | build_component_ref (TREE_OPERAND (datum, 2), component, | |
1773 | basetype_path, protect)); | |
1774 | } | |
1775 | ||
5566b478 MS |
1776 | code = TREE_CODE (basetype); |
1777 | ||
8d08fdba MS |
1778 | if (code == REFERENCE_TYPE) |
1779 | { | |
9e9ff709 | 1780 | datum = convert_from_reference (datum); |
8d08fdba MS |
1781 | basetype = TREE_TYPE (datum); |
1782 | code = TREE_CODE (basetype); | |
1783 | } | |
fc378698 MS |
1784 | if (TREE_CODE (datum) == OFFSET_REF) |
1785 | { | |
1786 | datum = resolve_offset_ref (datum); | |
1787 | basetype = TREE_TYPE (datum); | |
1788 | code = TREE_CODE (basetype); | |
1789 | } | |
8d08fdba | 1790 | |
e92cc029 | 1791 | /* First, see if there is a field or component with name COMPONENT. */ |
8d08fdba MS |
1792 | if (TREE_CODE (component) == TREE_LIST) |
1793 | { | |
1794 | my_friendly_assert (!(TREE_CHAIN (component) == NULL_TREE | |
1795 | && DECL_CHAIN (TREE_VALUE (component)) == NULL_TREE), 309); | |
1796 | return build (COMPONENT_REF, TREE_TYPE (component), datum, component); | |
1797 | } | |
8d08fdba MS |
1798 | |
1799 | if (! IS_AGGR_TYPE_CODE (code)) | |
1800 | { | |
1801 | if (code != ERROR_MARK) | |
1802 | cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", | |
1803 | component, datum, basetype); | |
1804 | return error_mark_node; | |
1805 | } | |
1806 | ||
5566b478 | 1807 | if (TYPE_SIZE (complete_type (basetype)) == 0) |
8d08fdba MS |
1808 | { |
1809 | incomplete_type_error (0, basetype); | |
1810 | return error_mark_node; | |
1811 | } | |
1812 | ||
1813 | if (TREE_CODE (component) == BIT_NOT_EXPR) | |
1814 | { | |
1815 | if (TYPE_IDENTIFIER (basetype) != TREE_OPERAND (component, 0)) | |
1816 | { | |
1817 | cp_error ("destructor specifier `%T::~%T' must have matching names", | |
1818 | basetype, TREE_OPERAND (component, 0)); | |
1819 | return error_mark_node; | |
1820 | } | |
1821 | if (! TYPE_HAS_DESTRUCTOR (basetype)) | |
1822 | { | |
1823 | cp_error ("type `%T' has no destructor", basetype); | |
1824 | return error_mark_node; | |
1825 | } | |
fc378698 | 1826 | return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 1); |
8d08fdba MS |
1827 | } |
1828 | ||
1829 | /* Look up component name in the structure type definition. */ | |
1830 | if (CLASSTYPE_VFIELD (basetype) | |
1831 | && DECL_NAME (CLASSTYPE_VFIELD (basetype)) == component) | |
1832 | /* Special-case this because if we use normal lookups in an ambiguous | |
1833 | hierarchy, the compiler will abort (because vptr lookups are | |
1834 | not supposed to be ambiguous. */ | |
1835 | field = CLASSTYPE_VFIELD (basetype); | |
d11ad92e MS |
1836 | else if (TREE_CODE (component) == FIELD_DECL |
1837 | || TREE_CODE (component) == TYPE_DECL) | |
9e9ff709 MS |
1838 | { |
1839 | field = component; | |
1840 | } | |
8d08fdba MS |
1841 | else |
1842 | { | |
d2e5ee5c MS |
1843 | tree name = component; |
1844 | if (TREE_CODE (component) == VAR_DECL) | |
1845 | name = DECL_NAME (component); | |
8d08fdba MS |
1846 | if (basetype_path == NULL_TREE) |
1847 | basetype_path = TYPE_BINFO (basetype); | |
d2e5ee5c MS |
1848 | field = lookup_field (basetype_path, name, |
1849 | protect && !VFIELD_NAME_P (name), 0); | |
8d08fdba MS |
1850 | if (field == error_mark_node) |
1851 | return error_mark_node; | |
1852 | ||
1853 | if (field == NULL_TREE) | |
1854 | { | |
1855 | /* Not found as a data field, look for it as a method. If found, | |
1856 | then if this is the only possible one, return it, else | |
1857 | report ambiguity error. */ | |
d2e5ee5c | 1858 | tree fndecls = lookup_fnfields (basetype_path, name, 1); |
8d08fdba MS |
1859 | if (fndecls == error_mark_node) |
1860 | return error_mark_node; | |
1861 | if (fndecls) | |
1862 | { | |
1863 | if (TREE_CHAIN (fndecls) == NULL_TREE | |
1864 | && DECL_CHAIN (TREE_VALUE (fndecls)) == NULL_TREE) | |
1865 | { | |
be99da77 | 1866 | tree access, fndecl; |
8d08fdba MS |
1867 | |
1868 | /* Unique, so use this one now. */ | |
1869 | basetype = TREE_PURPOSE (fndecls); | |
1870 | fndecl = TREE_VALUE (fndecls); | |
1871 | access = compute_access (TREE_PURPOSE (fndecls), fndecl); | |
be99da77 | 1872 | if (access == access_public_node) |
8d08fdba MS |
1873 | { |
1874 | if (DECL_VINDEX (fndecl) | |
1875 | && ! resolves_to_fixed_type_p (datum, 0)) | |
1876 | { | |
1877 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
faf5394a MS |
1878 | tree fntype = TREE_TYPE (fndecl); |
1879 | ||
8d08fdba MS |
1880 | addr = convert_pointer_to (DECL_CONTEXT (fndecl), addr); |
1881 | datum = build_indirect_ref (addr, NULL_PTR); | |
1882 | my_friendly_assert (datum != error_mark_node, 310); | |
1883 | fndecl = build_vfn_ref (&addr, datum, DECL_VINDEX (fndecl)); | |
faf5394a | 1884 | TREE_TYPE (fndecl) = build_pointer_type (fntype); |
8d08fdba | 1885 | } |
013bc8af MS |
1886 | else |
1887 | mark_used (fndecl); | |
594740f3 | 1888 | return build (OFFSET_REF, TREE_TYPE (fndecl), datum, fndecl); |
8d08fdba | 1889 | } |
be99da77 | 1890 | if (access == access_protected_node) |
8d08fdba MS |
1891 | cp_error ("member function `%D' is protected", fndecl); |
1892 | else | |
1893 | cp_error ("member function `%D' is private", fndecl); | |
1894 | return error_mark_node; | |
1895 | } | |
1896 | else | |
e1cd6e56 MS |
1897 | { |
1898 | /* Just act like build_offset_ref, since the object does | |
1899 | not matter unless we're actually calling the function. */ | |
28cbf42c MS |
1900 | tree t; |
1901 | ||
28cbf42c | 1902 | t = build_tree_list (error_mark_node, fndecls); |
e1cd6e56 MS |
1903 | TREE_TYPE (t) = build_offset_type (basetype, |
1904 | unknown_type_node); | |
1905 | return t; | |
1906 | } | |
8d08fdba MS |
1907 | } |
1908 | ||
d2e5ee5c | 1909 | cp_error ("`%#T' has no member named `%D'", basetype, name); |
8d08fdba MS |
1910 | return error_mark_node; |
1911 | } | |
1912 | else if (TREE_TYPE (field) == error_mark_node) | |
1913 | return error_mark_node; | |
1914 | ||
1915 | if (TREE_CODE (field) != FIELD_DECL) | |
1916 | { | |
1917 | if (TREE_CODE (field) == TYPE_DECL) | |
1918 | { | |
1919 | cp_error ("invalid use of type decl `%#D' as expression", field); | |
1920 | return error_mark_node; | |
1921 | } | |
72b7eeff MS |
1922 | else if (DECL_RTL (field) != 0) |
1923 | mark_used (field); | |
1924 | else | |
1925 | TREE_USED (field) = 1; | |
8d08fdba MS |
1926 | return field; |
1927 | } | |
1928 | } | |
1929 | ||
2ee887f2 MS |
1930 | /* See if we have to do any conversions so that we pick up the field from the |
1931 | right context. */ | |
9e9ff709 MS |
1932 | if (DECL_FIELD_CONTEXT (field) != basetype) |
1933 | { | |
1934 | tree context = DECL_FIELD_CONTEXT (field); | |
2ee887f2 | 1935 | tree base = context; |
fc378698 MS |
1936 | while (base != basetype && TYPE_NAME (base) |
1937 | && ANON_AGGRNAME_P (TYPE_IDENTIFIER (base))) | |
2ee887f2 MS |
1938 | { |
1939 | base = TYPE_CONTEXT (base); | |
1940 | } | |
1941 | ||
1942 | /* Handle base classes here... */ | |
1943 | if (base != basetype && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
1944 | { | |
1945 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
1946 | if (integer_zerop (addr)) | |
1947 | { | |
1948 | error ("invalid reference to NULL ptr, use ptr-to-member instead"); | |
1949 | return error_mark_node; | |
1950 | } | |
1951 | if (VBASE_NAME_P (DECL_NAME (field))) | |
1952 | { | |
1953 | /* It doesn't matter which vbase pointer we grab, just | |
1954 | find one of them. */ | |
1955 | tree binfo = get_binfo (base, | |
1956 | TREE_TYPE (TREE_TYPE (addr)), 0); | |
1957 | addr = convert_pointer_to_real (binfo, addr); | |
1958 | } | |
1959 | else | |
1960 | addr = convert_pointer_to (base, addr); | |
1961 | datum = build_indirect_ref (addr, NULL_PTR); | |
1962 | my_friendly_assert (datum != error_mark_node, 311); | |
1963 | } | |
1964 | basetype = base; | |
1965 | ||
1966 | /* Handle things from anon unions here... */ | |
fc378698 | 1967 | if (TYPE_NAME (context) && ANON_AGGRNAME_P (TYPE_IDENTIFIER (context))) |
9e9ff709 MS |
1968 | { |
1969 | tree subfield = lookup_anon_field (basetype, context); | |
1970 | tree subdatum = build_component_ref (datum, subfield, | |
1971 | basetype_path, protect); | |
1972 | return build_component_ref (subdatum, field, basetype_path, protect); | |
1973 | } | |
1974 | } | |
1975 | ||
f376e137 MS |
1976 | ref = fold (build (COMPONENT_REF, TREE_TYPE (field), |
1977 | break_out_cleanups (datum), field)); | |
8d08fdba MS |
1978 | |
1979 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1980 | TREE_READONLY (ref) = 1; | |
1981 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1982 | TREE_THIS_VOLATILE (ref) = 1; | |
1983 | if (DECL_MUTABLE_P (field)) | |
1984 | TREE_READONLY (ref) = 0; | |
1985 | ||
1986 | return ref; | |
1987 | } | |
5156628f MS |
1988 | |
1989 | /* Variant of build_component_ref for use in expressions, which should | |
1990 | never have REFERENCE_TYPE. */ | |
1991 | ||
1992 | tree | |
1993 | build_x_component_ref (datum, component, basetype_path, protect) | |
1994 | tree datum, component, basetype_path; | |
1995 | int protect; | |
1996 | { | |
1997 | tree t = build_component_ref (datum, component, basetype_path, protect); | |
1998 | ||
1999 | if (! processing_template_decl) | |
2000 | t = convert_from_reference (t); | |
2001 | ||
2002 | return t; | |
2003 | } | |
8d08fdba MS |
2004 | \f |
2005 | /* Given an expression PTR for a pointer, return an expression | |
2006 | for the value pointed to. | |
2007 | ERRORSTRING is the name of the operator to appear in error messages. | |
2008 | ||
2009 | This function may need to overload OPERATOR_FNNAME. | |
2010 | Must also handle REFERENCE_TYPEs for C++. */ | |
2011 | ||
2012 | tree | |
2013 | build_x_indirect_ref (ptr, errorstring) | |
2014 | tree ptr; | |
2015 | char *errorstring; | |
2016 | { | |
5566b478 MS |
2017 | tree rval; |
2018 | ||
5156628f | 2019 | if (processing_template_decl) |
5566b478 MS |
2020 | return build_min_nt (INDIRECT_REF, ptr); |
2021 | ||
2022 | rval = build_opfncall (INDIRECT_REF, LOOKUP_NORMAL, ptr, NULL_TREE, NULL_TREE); | |
8d08fdba MS |
2023 | if (rval) |
2024 | return rval; | |
2025 | return build_indirect_ref (ptr, errorstring); | |
2026 | } | |
2027 | ||
2028 | tree | |
2029 | build_indirect_ref (ptr, errorstring) | |
2030 | tree ptr; | |
2031 | char *errorstring; | |
2032 | { | |
c11b6f21 MS |
2033 | register tree pointer, type; |
2034 | ||
2035 | if (ptr == error_mark_node) | |
2036 | return error_mark_node; | |
2037 | ||
2038 | pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE | |
2039 | ? ptr : default_conversion (ptr)); | |
2040 | type = TREE_TYPE (pointer); | |
8d08fdba | 2041 | |
4ac14744 MS |
2042 | if (ptr == current_class_ptr) |
2043 | return current_class_ref; | |
8d08fdba | 2044 | |
f30432d7 | 2045 | if (IS_AGGR_TYPE (type)) |
28cbf42c | 2046 | { |
f30432d7 MS |
2047 | ptr = build_expr_type_conversion (WANT_POINTER, pointer, 1); |
2048 | ||
2049 | if (ptr) | |
2050 | { | |
2051 | pointer = ptr; | |
2052 | type = TREE_TYPE (pointer); | |
2053 | } | |
28cbf42c MS |
2054 | } |
2055 | ||
8d08fdba MS |
2056 | if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) |
2057 | { | |
2058 | if (TREE_CODE (pointer) == ADDR_EXPR | |
b0d75c1e | 2059 | && !flag_volatile |
1743ca29 RK |
2060 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (pointer, 0))) |
2061 | == TYPE_MAIN_VARIANT (TREE_TYPE (type))) | |
2062 | && (TREE_READONLY (TREE_OPERAND (pointer, 0)) | |
2063 | == TYPE_READONLY (TREE_TYPE (type))) | |
2064 | && (TREE_THIS_VOLATILE (TREE_OPERAND (pointer, 0)) | |
2065 | == TYPE_VOLATILE (TREE_TYPE (type)))) | |
8d08fdba MS |
2066 | return TREE_OPERAND (pointer, 0); |
2067 | else | |
2068 | { | |
2069 | tree t = TREE_TYPE (type); | |
2070 | register tree ref = build1 (INDIRECT_REF, | |
2071 | TYPE_MAIN_VARIANT (t), pointer); | |
2072 | ||
b0d75c1e BK |
2073 | /* We *must* set TREE_READONLY when dereferencing a pointer to const, |
2074 | so that we get the proper error message if the result is used | |
2075 | to assign to. Also, &* is supposed to be a no-op. */ | |
8d08fdba | 2076 | TREE_READONLY (ref) = TYPE_READONLY (t); |
8d08fdba | 2077 | TREE_SIDE_EFFECTS (ref) |
b0d75c1e BK |
2078 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer) || flag_volatile; |
2079 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); | |
8d08fdba MS |
2080 | return ref; |
2081 | } | |
2082 | } | |
2083 | /* `pointer' won't be an error_mark_node if we were given a | |
2084 | pointer to member, so it's cool to check for this here. */ | |
2085 | else if (TYPE_PTRMEMFUNC_P (type)) | |
2086 | error ("invalid use of `%s' on pointer to member function", errorstring); | |
2087 | else if (TREE_CODE (type) == RECORD_TYPE | |
2088 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
2089 | error ("cannot dereference signature pointer/reference"); | |
2090 | else if (pointer != error_mark_node) | |
2091 | { | |
2092 | if (errorstring) | |
2093 | error ("invalid type argument of `%s'", errorstring); | |
2094 | else | |
2095 | error ("invalid type argument"); | |
2096 | } | |
2097 | return error_mark_node; | |
2098 | } | |
2099 | ||
2100 | /* This handles expressions of the form "a[i]", which denotes | |
2101 | an array reference. | |
2102 | ||
2103 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
2104 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
2105 | This avoids forcing the array out of registers, and can work on | |
2106 | arrays that are not lvalues (for example, members of structures returned | |
2107 | by functions). | |
2108 | ||
2109 | If INDEX is of some user-defined type, it must be converted to | |
2110 | integer type. Otherwise, to make a compatible PLUS_EXPR, it | |
2111 | will inherit the type of the array, which will be some pointer type. */ | |
2112 | ||
8d08fdba MS |
2113 | tree |
2114 | build_array_ref (array, idx) | |
2115 | tree array, idx; | |
2116 | { | |
8d08fdba MS |
2117 | if (idx == 0) |
2118 | { | |
2119 | error ("subscript missing in array reference"); | |
2120 | return error_mark_node; | |
2121 | } | |
2122 | ||
2123 | if (TREE_TYPE (array) == error_mark_node | |
2124 | || TREE_TYPE (idx) == error_mark_node) | |
2125 | return error_mark_node; | |
2126 | ||
8d08fdba MS |
2127 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE |
2128 | && TREE_CODE (array) != INDIRECT_REF) | |
2129 | { | |
2130 | tree rval, type; | |
2131 | ||
2132 | /* Subscripting with type char is likely to lose | |
2133 | on a machine where chars are signed. | |
2134 | So warn on any machine, but optionally. | |
2135 | Don't warn for unsigned char since that type is safe. | |
2136 | Don't warn for signed char because anyone who uses that | |
2137 | must have done so deliberately. */ | |
2138 | if (warn_char_subscripts | |
2139 | && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node) | |
2140 | warning ("array subscript has type `char'"); | |
2141 | ||
2142 | /* Apply default promotions *after* noticing character types. */ | |
2143 | idx = default_conversion (idx); | |
2144 | ||
2145 | if (TREE_CODE (TREE_TYPE (idx)) != INTEGER_TYPE) | |
2146 | { | |
2147 | error ("array subscript is not an integer"); | |
2148 | return error_mark_node; | |
2149 | } | |
2150 | ||
2151 | /* An array that is indexed by a non-constant | |
2152 | cannot be stored in a register; we must be able to do | |
2153 | address arithmetic on its address. | |
2154 | Likewise an array of elements of variable size. */ | |
2155 | if (TREE_CODE (idx) != INTEGER_CST | |
2156 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
2157 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
2158 | { | |
2159 | if (mark_addressable (array) == 0) | |
2160 | return error_mark_node; | |
2161 | } | |
2162 | /* An array that is indexed by a constant value which is not within | |
2163 | the array bounds cannot be stored in a register either; because we | |
2164 | would get a crash in store_bit_field/extract_bit_field when trying | |
2165 | to access a non-existent part of the register. */ | |
2166 | if (TREE_CODE (idx) == INTEGER_CST | |
2167 | && TYPE_VALUES (TREE_TYPE (array)) | |
2168 | && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array)))) | |
2169 | { | |
2170 | if (mark_addressable (array) == 0) | |
2171 | return error_mark_node; | |
2172 | } | |
2173 | ||
8d08fdba MS |
2174 | if (pedantic && !lvalue_p (array)) |
2175 | pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); | |
2176 | ||
b7484fbe MS |
2177 | /* Note in C++ it is valid to subscript a `register' array, since |
2178 | it is valid to take the address of something with that | |
2179 | storage specification. */ | |
2180 | if (extra_warnings) | |
8d08fdba MS |
2181 | { |
2182 | tree foo = array; | |
2183 | while (TREE_CODE (foo) == COMPONENT_REF) | |
2184 | foo = TREE_OPERAND (foo, 0); | |
2185 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) | |
b7484fbe | 2186 | warning ("subscripting array declared `register'"); |
8d08fdba MS |
2187 | } |
2188 | ||
2189 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
2190 | rval = build (ARRAY_REF, type, array, idx); | |
2191 | /* Array ref is const/volatile if the array elements are | |
2192 | or if the array is.. */ | |
2193 | TREE_READONLY (rval) | |
2194 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
2195 | | TREE_READONLY (array)); | |
2196 | TREE_SIDE_EFFECTS (rval) | |
2197 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2198 | | TREE_SIDE_EFFECTS (array)); | |
2199 | TREE_THIS_VOLATILE (rval) | |
2200 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2201 | /* This was added by rms on 16 Nov 91. | |
2202 | It fixes vol struct foo *a; a->elts[1] | |
2203 | in an inline function. | |
2204 | Hope it doesn't break something else. */ | |
2205 | | TREE_THIS_VOLATILE (array)); | |
2206 | return require_complete_type (fold (rval)); | |
2207 | } | |
2208 | ||
2209 | { | |
2210 | tree ar = default_conversion (array); | |
2211 | tree ind = default_conversion (idx); | |
2212 | ||
2213 | /* Put the integer in IND to simplify error checking. */ | |
2214 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
2215 | { | |
2216 | tree temp = ar; | |
2217 | ar = ind; | |
2218 | ind = temp; | |
2219 | } | |
2220 | ||
2221 | if (ar == error_mark_node) | |
2222 | return ar; | |
2223 | ||
2224 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) | |
2225 | { | |
2226 | error ("subscripted value is neither array nor pointer"); | |
2227 | return error_mark_node; | |
2228 | } | |
2229 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
2230 | { | |
2231 | error ("array subscript is not an integer"); | |
2232 | return error_mark_node; | |
2233 | } | |
2234 | ||
2235 | return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR, ar, ind, PLUS_EXPR), | |
2236 | "array indexing"); | |
2237 | } | |
2238 | } | |
2239 | \f | |
2240 | /* Build a function call to function FUNCTION with parameters PARAMS. | |
2241 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
4ac14744 MS |
2242 | TREE_VALUE of each node is a parameter-expression. The PARAMS do |
2243 | not include any object pointer that may be required. FUNCTION's | |
2244 | data type may be a function type or a pointer-to-function. | |
8d08fdba MS |
2245 | |
2246 | For C++: If FUNCTION's data type is a TREE_LIST, then the tree list | |
2247 | is the list of possible methods that FUNCTION could conceivably | |
2248 | be. If the list of methods comes from a class, then it will be | |
2249 | a list of lists (where each element is associated with the class | |
2250 | that produced it), otherwise it will be a simple list (for | |
2251 | functions overloaded in global scope). | |
2252 | ||
2253 | In the first case, TREE_VALUE (function) is the head of one of those | |
2254 | lists, and TREE_PURPOSE is the name of the function. | |
2255 | ||
2256 | In the second case, TREE_PURPOSE (function) is the function's | |
2257 | name directly. | |
2258 | ||
4ac14744 | 2259 | DECL is the class instance variable, usually CURRENT_CLASS_REF. |
4dabb379 MS |
2260 | |
2261 | When calling a TEMPLATE_DECL, we don't require a complete return | |
2262 | type. */ | |
8d08fdba | 2263 | |
8d08fdba MS |
2264 | tree |
2265 | build_x_function_call (function, params, decl) | |
2266 | tree function, params, decl; | |
2267 | { | |
2268 | tree type; | |
2269 | int is_method; | |
2270 | ||
2271 | if (function == error_mark_node) | |
2272 | return error_mark_node; | |
2273 | ||
5156628f | 2274 | if (processing_template_decl) |
4dabb379 | 2275 | return build_min_nt (CALL_EXPR, function, params, NULL_TREE); |
5566b478 | 2276 | |
8d08fdba | 2277 | type = TREE_TYPE (function); |
fc378698 MS |
2278 | |
2279 | if (TREE_CODE (type) == OFFSET_TYPE | |
2280 | && TREE_TYPE (type) == unknown_type_node | |
2281 | && TREE_CODE (function) == TREE_LIST | |
2282 | && TREE_CHAIN (function) == NULL_TREE) | |
2283 | { | |
e92cc029 | 2284 | /* Undo (Foo:bar)()... */ |
fc378698 MS |
2285 | type = TYPE_OFFSET_BASETYPE (type); |
2286 | function = TREE_VALUE (function); | |
2287 | my_friendly_assert (TREE_CODE (function) == TREE_LIST, 999); | |
2288 | my_friendly_assert (TREE_CHAIN (function) == NULL_TREE, 999); | |
2289 | function = TREE_VALUE (function); | |
2290 | my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 999); | |
2291 | function = DECL_NAME (function); | |
2292 | return build_method_call (decl, function, params, TYPE_BINFO (type), LOOKUP_NORMAL); | |
2293 | } | |
2294 | ||
8d08fdba MS |
2295 | is_method = ((TREE_CODE (function) == TREE_LIST |
2296 | && current_class_type != NULL_TREE | |
2297 | && IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function)) == function) | |
2298 | || TREE_CODE (function) == IDENTIFIER_NODE | |
2299 | || TREE_CODE (type) == METHOD_TYPE | |
2300 | || TYPE_PTRMEMFUNC_P (type)); | |
2301 | ||
fc378698 MS |
2302 | if (TREE_CODE (function) == FUNCTION_DECL |
2303 | && DECL_STATIC_FUNCTION_P (function)) | |
2304 | return build_member_call | |
2305 | (DECL_CONTEXT (function), DECL_NAME (function), params); | |
2306 | ||
8d08fdba MS |
2307 | /* Handle methods, friends, and overloaded functions, respectively. */ |
2308 | if (is_method) | |
2309 | { | |
c73964b2 MS |
2310 | tree basetype = NULL_TREE; |
2311 | ||
98c1c668 JM |
2312 | if (TREE_CODE (function) == FUNCTION_DECL |
2313 | || DECL_FUNCTION_TEMPLATE_P (function)) | |
8d08fdba | 2314 | { |
c73964b2 MS |
2315 | basetype = DECL_CLASS_CONTEXT (function); |
2316 | ||
8d08fdba MS |
2317 | if (DECL_NAME (function)) |
2318 | function = DECL_NAME (function); | |
2319 | else | |
2320 | function = TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)); | |
2321 | } | |
2322 | else if (TREE_CODE (function) == TREE_LIST) | |
2323 | { | |
8d08fdba | 2324 | my_friendly_assert (TREE_CODE (TREE_VALUE (function)) == FUNCTION_DECL, 312); |
c73964b2 | 2325 | basetype = DECL_CLASS_CONTEXT (TREE_VALUE (function)); |
8d08fdba | 2326 | function = TREE_PURPOSE (function); |
8d08fdba MS |
2327 | } |
2328 | else if (TREE_CODE (function) != IDENTIFIER_NODE) | |
2329 | { | |
2330 | if (TREE_CODE (function) == OFFSET_REF) | |
2331 | { | |
2332 | if (TREE_OPERAND (function, 0)) | |
2333 | decl = TREE_OPERAND (function, 0); | |
2334 | } | |
2335 | /* Call via a pointer to member function. */ | |
2336 | if (decl == NULL_TREE) | |
2337 | { | |
2338 | error ("pointer to member function called, but not in class scope"); | |
2339 | return error_mark_node; | |
2340 | } | |
2341 | /* What other type of POINTER_TYPE could this be? */ | |
2342 | if (TREE_CODE (TREE_TYPE (function)) != POINTER_TYPE | |
2343 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function)) | |
2344 | && TREE_CODE (function) != OFFSET_REF) | |
2345 | function = build (OFFSET_REF, TREE_TYPE (type), NULL_TREE, function); | |
2346 | goto do_x_function; | |
2347 | } | |
2348 | ||
2349 | /* this is an abbreviated method call. | |
2350 | must go through here in case it is a virtual function. | |
2351 | @@ Perhaps this could be optimized. */ | |
2352 | ||
c73964b2 MS |
2353 | if (basetype && (! current_class_type |
2354 | || ! DERIVED_FROM_P (basetype, current_class_type))) | |
2355 | return build_member_call (basetype, function, params); | |
2356 | ||
8d08fdba MS |
2357 | if (decl == NULL_TREE) |
2358 | { | |
2359 | if (current_class_type == NULL_TREE) | |
2360 | { | |
2361 | error ("object missing in call to method `%s'", | |
2362 | IDENTIFIER_POINTER (function)); | |
2363 | return error_mark_node; | |
2364 | } | |
2365 | /* Yow: call from a static member function. */ | |
f30432d7 | 2366 | decl = build1 (NOP_EXPR, build_pointer_type (current_class_type), |
8d08fdba MS |
2367 | error_mark_node); |
2368 | decl = build_indirect_ref (decl, NULL_PTR); | |
2369 | } | |
2370 | ||
2371 | return build_method_call (decl, function, params, | |
2372 | NULL_TREE, LOOKUP_NORMAL); | |
2373 | } | |
2374 | else if (TREE_CODE (function) == COMPONENT_REF | |
2375 | && type == unknown_type_node) | |
2376 | { | |
2377 | /* Should we undo what was done in build_component_ref? */ | |
2378 | if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function, 1))) == TREE_VEC) | |
e92cc029 | 2379 | /* Get the name that build_component_ref hid. */ |
8d08fdba MS |
2380 | function = DECL_NAME (TREE_VALUE (TREE_OPERAND (function, 1))); |
2381 | else | |
2382 | function = TREE_PURPOSE (TREE_OPERAND (function, 1)); | |
2383 | return build_method_call (decl, function, params, | |
2384 | NULL_TREE, LOOKUP_NORMAL); | |
2385 | } | |
386b8a85 | 2386 | else if (really_overloaded_fn (function)) |
8d08fdba MS |
2387 | { |
2388 | if (TREE_VALUE (function) == NULL_TREE) | |
2389 | { | |
2390 | cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?", | |
2391 | TREE_PURPOSE (function)); | |
2392 | return error_mark_node; | |
2393 | } | |
2394 | else | |
2395 | { | |
5b605f68 | 2396 | tree val = TREE_VALUE (function); |
8d08fdba | 2397 | |
c73964b2 MS |
2398 | if (flag_ansi_overloading) |
2399 | return build_new_function_call (function, params, NULL_TREE); | |
2400 | ||
5b605f68 | 2401 | if (TREE_CODE (val) == TEMPLATE_DECL) |
4dabb379 MS |
2402 | return build_overload_call_real |
2403 | (function, params, LOOKUP_COMPLAIN, (struct candidate *)0, 0); | |
5b605f68 | 2404 | else if (DECL_CHAIN (val) != NULL_TREE) |
8d08fdba | 2405 | return build_overload_call |
ce122a86 | 2406 | (function, params, LOOKUP_COMPLAIN); |
5b605f68 MS |
2407 | else |
2408 | my_friendly_abort (360); | |
8d08fdba MS |
2409 | } |
2410 | } | |
2411 | ||
2412 | do_x_function: | |
2413 | if (TREE_CODE (function) == OFFSET_REF) | |
2414 | { | |
2415 | /* If the component is a data element (or a virtual function), we play | |
2416 | games here to make things work. */ | |
2417 | tree decl_addr; | |
2418 | ||
2419 | if (TREE_OPERAND (function, 0)) | |
2420 | decl = TREE_OPERAND (function, 0); | |
2421 | else | |
4ac14744 | 2422 | decl = current_class_ref; |
8d08fdba MS |
2423 | |
2424 | decl_addr = build_unary_op (ADDR_EXPR, decl, 0); | |
b7484fbe | 2425 | function = get_member_function_from_ptrfunc (&decl_addr, |
8d08fdba | 2426 | TREE_OPERAND (function, 1)); |
e66d884e | 2427 | params = expr_tree_cons (NULL_TREE, decl_addr, params); |
8d08fdba MS |
2428 | return build_function_call (function, params); |
2429 | } | |
2430 | ||
2431 | type = TREE_TYPE (function); | |
2432 | if (type != error_mark_node) | |
2433 | { | |
2434 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
2435 | type = TREE_TYPE (type); | |
2436 | ||
6467930b | 2437 | if (IS_AGGR_TYPE (type)) |
8d08fdba MS |
2438 | return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, function, params, NULL_TREE); |
2439 | } | |
2440 | ||
2441 | if (is_method) | |
2442 | { | |
2443 | tree fntype = TREE_TYPE (function); | |
2444 | tree ctypeptr; | |
2445 | ||
2446 | /* Explicitly named method? */ | |
2447 | if (TREE_CODE (function) == FUNCTION_DECL) | |
f30432d7 | 2448 | ctypeptr = build_pointer_type (DECL_CLASS_CONTEXT (function)); |
8d08fdba MS |
2449 | /* Expression with ptr-to-method type? It could either be a plain |
2450 | usage, or it might be a case where the ptr-to-method is being | |
2451 | passed in as an argument. */ | |
2452 | else if (TYPE_PTRMEMFUNC_P (fntype)) | |
2453 | { | |
2454 | tree rec = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (fntype))); | |
f30432d7 | 2455 | ctypeptr = build_pointer_type (rec); |
8d08fdba MS |
2456 | } |
2457 | /* Unexpected node type? */ | |
2458 | else | |
2459 | my_friendly_abort (116); | |
2460 | if (decl == NULL_TREE) | |
2461 | { | |
2462 | if (current_function_decl | |
2463 | && DECL_STATIC_FUNCTION_P (current_function_decl)) | |
2464 | error ("invalid call to member function needing `this' in static member function scope"); | |
2465 | else | |
2466 | error ("pointer to member function called, but not in class scope"); | |
2467 | return error_mark_node; | |
2468 | } | |
2469 | if (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE | |
2470 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl))) | |
2471 | { | |
2472 | decl = build_unary_op (ADDR_EXPR, decl, 0); | |
2473 | decl = convert_pointer_to (TREE_TYPE (ctypeptr), decl); | |
2474 | } | |
2475 | else | |
faf5394a | 2476 | decl = build_c_cast (ctypeptr, decl); |
e66d884e | 2477 | params = expr_tree_cons (NULL_TREE, decl, params); |
8d08fdba MS |
2478 | } |
2479 | ||
2480 | return build_function_call (function, params); | |
2481 | } | |
2482 | ||
2483 | /* Resolve a pointer to member function. INSTANCE is the object | |
2484 | instance to use, if the member points to a virtual member. */ | |
2485 | ||
2486 | tree | |
b7484fbe | 2487 | get_member_function_from_ptrfunc (instance_ptrptr, function) |
8d08fdba | 2488 | tree *instance_ptrptr; |
8d08fdba MS |
2489 | tree function; |
2490 | { | |
2491 | if (TREE_CODE (function) == OFFSET_REF) | |
2492 | { | |
2493 | function = TREE_OPERAND (function, 1); | |
2494 | } | |
2495 | ||
2496 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) | |
2497 | { | |
e92cc029 | 2498 | tree fntype, idx, e1, delta, delta2, e2, e3, aref, vtbl; |
b7484fbe | 2499 | tree instance; |
f30432d7 | 2500 | |
b7484fbe MS |
2501 | tree instance_ptr = *instance_ptrptr; |
2502 | ||
2503 | if (TREE_SIDE_EFFECTS (instance_ptr)) | |
2504 | instance_ptr = save_expr (instance_ptr); | |
2505 | ||
f30432d7 MS |
2506 | if (TREE_SIDE_EFFECTS (function)) |
2507 | function = save_expr (function); | |
2508 | ||
2509 | fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); | |
42976354 BK |
2510 | |
2511 | /* Promoting idx before saving it improves performance on RISC | |
2512 | targets. Without promoting, the first compare used | |
2513 | load-with-sign-extend, while the second used normal load then | |
2514 | shift to sign-extend. An optimizer flaw, perhaps, but it's easier | |
2515 | to make this change. */ | |
2516 | idx = save_expr (default_conversion | |
2517 | (build_component_ref (function, | |
2518 | index_identifier, | |
2519 | NULL_TREE, 0))); | |
2520 | e1 = build_binary_op (GT_EXPR, idx, integer_zero_node, 1); | |
37c46b43 MS |
2521 | delta = cp_convert (ptrdiff_type_node, |
2522 | build_component_ref (function, delta_identifier, NULL_TREE, 0)); | |
f30432d7 MS |
2523 | delta2 = DELTA2_FROM_PTRMEMFUNC (function); |
2524 | ||
37c46b43 | 2525 | /* Convert down to the right base, before using the instance. */ |
b7484fbe MS |
2526 | instance |
2527 | = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)), | |
2528 | instance_ptr); | |
f49422da | 2529 | if (instance == error_mark_node && instance_ptr != error_mark_node) |
51c184be MS |
2530 | return instance; |
2531 | ||
2532 | vtbl = convert_pointer_to (ptr_type_node, instance); | |
700f8a87 MS |
2533 | vtbl |
2534 | = build (PLUS_EXPR, | |
2535 | build_pointer_type (build_pointer_type (vtable_entry_type)), | |
37c46b43 | 2536 | vtbl, cp_convert (ptrdiff_type_node, delta2)); |
8d08fdba | 2537 | vtbl = build_indirect_ref (vtbl, NULL_PTR); |
e1cd6e56 | 2538 | aref = build_array_ref (vtbl, build_binary_op (MINUS_EXPR, |
e92cc029 | 2539 | idx, |
e1cd6e56 | 2540 | integer_one_node, 1)); |
700f8a87 MS |
2541 | if (! flag_vtable_thunks) |
2542 | { | |
2543 | aref = save_expr (aref); | |
8d08fdba | 2544 | |
e1cd6e56 | 2545 | delta = build_binary_op (PLUS_EXPR, |
4dabb379 | 2546 | build_conditional_expr (e1, build_component_ref (aref, delta_identifier, NULL_TREE, 0), integer_zero_node), |
e1cd6e56 | 2547 | delta, 1); |
700f8a87 | 2548 | } |
8d08fdba | 2549 | |
b7484fbe MS |
2550 | *instance_ptrptr = build (PLUS_EXPR, TREE_TYPE (instance_ptr), |
2551 | instance_ptr, delta); | |
700f8a87 MS |
2552 | if (flag_vtable_thunks) |
2553 | e2 = aref; | |
2554 | else | |
4dabb379 | 2555 | e2 = build_component_ref (aref, pfn_identifier, NULL_TREE, 0); |
8d08fdba MS |
2556 | |
2557 | e3 = PFN_FROM_PTRMEMFUNC (function); | |
2558 | TREE_TYPE (e2) = TREE_TYPE (e3); | |
f49422da MS |
2559 | e1 = build_conditional_expr (e1, e2, e3); |
2560 | ||
2561 | if (instance_ptr == error_mark_node | |
2562 | && TREE_CODE (e1) != ADDR_EXPR | |
2563 | && TREE_CODE (TREE_OPERAND (e1, 0)) != FUNCTION_DECL) | |
2564 | cp_error ("object missing in `%E'", function); | |
2565 | ||
2566 | function = e1; | |
b7484fbe MS |
2567 | |
2568 | /* Make sure this doesn't get evaluated first inside one of the | |
2569 | branches of the COND_EXPR. */ | |
2570 | if (TREE_CODE (instance_ptr) == SAVE_EXPR) | |
2571 | function = build (COMPOUND_EXPR, TREE_TYPE (function), | |
2572 | instance_ptr, function); | |
8d08fdba MS |
2573 | } |
2574 | return function; | |
2575 | } | |
2576 | ||
2577 | tree | |
2578 | build_function_call_real (function, params, require_complete, flags) | |
2579 | tree function, params; | |
2580 | int require_complete, flags; | |
2581 | { | |
2582 | register tree fntype, fndecl; | |
2583 | register tree value_type; | |
2584 | register tree coerced_params; | |
2585 | tree name = NULL_TREE, assembler_name = NULL_TREE; | |
2586 | int is_method; | |
2587 | ||
2588 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
2589 | Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ | |
2590 | if (TREE_CODE (function) == NOP_EXPR | |
2591 | && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) | |
2592 | function = TREE_OPERAND (function, 0); | |
2593 | ||
2594 | if (TREE_CODE (function) == FUNCTION_DECL) | |
2595 | { | |
2596 | name = DECL_NAME (function); | |
2597 | assembler_name = DECL_ASSEMBLER_NAME (function); | |
2598 | ||
2599 | GNU_xref_call (current_function_decl, | |
2600 | IDENTIFIER_POINTER (name ? name | |
2601 | : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)))); | |
72b7eeff | 2602 | mark_used (function); |
8d08fdba MS |
2603 | fndecl = function; |
2604 | ||
2605 | /* Convert anything with function type to a pointer-to-function. */ | |
2606 | if (pedantic | |
2607 | && name | |
2608 | && IDENTIFIER_LENGTH (name) == 4 | |
2609 | && ! strcmp (IDENTIFIER_POINTER (name), "main") | |
2610 | && DECL_CONTEXT (function) == NULL_TREE) | |
2611 | { | |
2612 | pedwarn ("ANSI C++ forbids calling `main' from within program"); | |
2613 | } | |
2614 | ||
a5894242 MS |
2615 | if (pedantic && DECL_THIS_INLINE (function) && ! DECL_INITIAL (function) |
2616 | && ! DECL_ARTIFICIAL (function) | |
2617 | && ! DECL_PENDING_INLINE_INFO (function)) | |
2618 | cp_pedwarn ("inline function `%#D' called before definition", | |
2619 | function); | |
2620 | ||
8d08fdba MS |
2621 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
2622 | (because calling an inline function does not mean the function | |
2623 | needs to be separately compiled). */ | |
2624 | ||
2625 | if (DECL_INLINE (function)) | |
73aad9b9 | 2626 | function = inline_conversion (function); |
8d08fdba | 2627 | else |
4ac14744 | 2628 | function = build_addr_func (function); |
8d08fdba MS |
2629 | } |
2630 | else | |
2631 | { | |
2632 | fndecl = NULL_TREE; | |
2633 | ||
4ac14744 | 2634 | function = build_addr_func (function); |
8d08fdba MS |
2635 | } |
2636 | ||
4ac14744 MS |
2637 | if (function == error_mark_node) |
2638 | return error_mark_node; | |
2639 | ||
8d08fdba MS |
2640 | fntype = TREE_TYPE (function); |
2641 | ||
2642 | if (TYPE_PTRMEMFUNC_P (fntype)) | |
2643 | { | |
4ac14744 MS |
2644 | cp_error ("must use .* or ->* to call pointer-to-member function in `%E (...)'", |
2645 | function); | |
2646 | return error_mark_node; | |
8d08fdba MS |
2647 | } |
2648 | ||
2649 | is_method = (TREE_CODE (fntype) == POINTER_TYPE | |
2650 | && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); | |
2651 | ||
2652 | if (!((TREE_CODE (fntype) == POINTER_TYPE | |
2653 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) | |
386b8a85 JM |
2654 | || is_method |
2655 | || TREE_CODE (function) == TEMPLATE_ID_EXPR)) | |
8d08fdba | 2656 | { |
a5894242 | 2657 | cp_error ("`%E' cannot be used as a function", function); |
8d08fdba MS |
2658 | return error_mark_node; |
2659 | } | |
2660 | ||
2661 | /* fntype now gets the type of function pointed to. */ | |
2662 | fntype = TREE_TYPE (fntype); | |
2663 | ||
2664 | /* Convert the parameters to the types declared in the | |
2665 | function prototype, or apply default promotions. */ | |
2666 | ||
2667 | if (flags & LOOKUP_COMPLAIN) | |
2668 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2669 | params, fndecl, LOOKUP_NORMAL); | |
2670 | else | |
2671 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2672 | params, fndecl, 0); | |
2673 | ||
863adfc0 | 2674 | if (coerced_params == error_mark_node) |
878cd289 MS |
2675 | if (flags & LOOKUP_SPECULATIVELY) |
2676 | return NULL_TREE; | |
2677 | else | |
2678 | return error_mark_node; | |
863adfc0 | 2679 | |
8d08fdba MS |
2680 | /* Check for errors in format strings. */ |
2681 | ||
2682 | if (warn_format && (name || assembler_name)) | |
2683 | check_function_format (name, assembler_name, coerced_params); | |
2684 | ||
2685 | /* Recognize certain built-in functions so we can make tree-codes | |
2686 | other than CALL_EXPR. We do this when it enables fold-const.c | |
2687 | to do something useful. */ | |
2688 | ||
2689 | if (TREE_CODE (function) == ADDR_EXPR | |
2690 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
2691 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
2692 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
2693 | { | |
2694 | case BUILT_IN_ABS: | |
2695 | case BUILT_IN_LABS: | |
2696 | case BUILT_IN_FABS: | |
2697 | if (coerced_params == 0) | |
2698 | return integer_zero_node; | |
2699 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
2700 | } | |
2701 | ||
2702 | /* C++ */ | |
2703 | value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node; | |
2704 | { | |
4ac14744 MS |
2705 | register tree result |
2706 | = build_call (function, value_type, coerced_params); | |
8ccc31eb | 2707 | |
4ac14744 MS |
2708 | if (require_complete) |
2709 | { | |
2710 | if (value_type == void_type_node) | |
2711 | return result; | |
2712 | result = require_complete_type (result); | |
2713 | } | |
c73964b2 MS |
2714 | if (IS_AGGR_TYPE (value_type)) |
2715 | result = build_cplus_new (value_type, result); | |
8ccc31eb | 2716 | return convert_from_reference (result); |
8d08fdba MS |
2717 | } |
2718 | } | |
2719 | ||
2720 | tree | |
2721 | build_function_call (function, params) | |
2722 | tree function, params; | |
2723 | { | |
39211cd5 | 2724 | return build_function_call_real (function, params, 1, LOOKUP_NORMAL); |
8d08fdba | 2725 | } |
8d08fdba MS |
2726 | \f |
2727 | /* Convert the actual parameter expressions in the list VALUES | |
2728 | to the types in the list TYPELIST. | |
2729 | If parmdecls is exhausted, or when an element has NULL as its type, | |
2730 | perform the default conversions. | |
2731 | ||
2732 | RETURN_LOC is the location of the return value, if known, NULL_TREE | |
2733 | otherwise. This is useful in the case where we can avoid creating | |
2734 | a temporary variable in the case where we can initialize the return | |
2735 | value directly. If we are not eliding constructors, then we set this | |
2736 | to NULL_TREE to avoid this avoidance. | |
2737 | ||
2738 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
2739 | ||
2740 | This is also where warnings about wrong number of args are generated. | |
2741 | ||
2742 | Return a list of expressions for the parameters as converted. | |
2743 | ||
2744 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
2745 | with the elements of the list in the TREE_VALUE slots of those nodes. | |
2746 | ||
2747 | In C++, unspecified trailing parameters can be filled in with their | |
2748 | default arguments, if such were specified. Do so here. */ | |
2749 | ||
2750 | tree | |
2751 | convert_arguments (return_loc, typelist, values, fndecl, flags) | |
2752 | tree return_loc, typelist, values, fndecl; | |
2753 | int flags; | |
2754 | { | |
8d08fdba MS |
2755 | register tree typetail, valtail; |
2756 | register tree result = NULL_TREE; | |
2757 | char *called_thing; | |
8d08fdba MS |
2758 | int i = 0; |
2759 | ||
2760 | if (! flag_elide_constructors) | |
2761 | return_loc = 0; | |
2762 | ||
faf5394a MS |
2763 | /* Argument passing is always copy-initialization. */ |
2764 | flags |= LOOKUP_ONLYCONVERTING; | |
2765 | ||
8d08fdba MS |
2766 | if (fndecl) |
2767 | { | |
2768 | if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) | |
2769 | { | |
2770 | if (DECL_NAME (fndecl) == NULL_TREE | |
2771 | || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) | |
2772 | called_thing = "constructor"; | |
2773 | else | |
2774 | called_thing = "member function"; | |
8d08fdba MS |
2775 | } |
2776 | else | |
a0a33927 | 2777 | called_thing = "function"; |
8d08fdba MS |
2778 | } |
2779 | ||
2780 | for (valtail = values, typetail = typelist; | |
2781 | valtail; | |
2782 | valtail = TREE_CHAIN (valtail), i++) | |
2783 | { | |
2784 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
2785 | register tree val = TREE_VALUE (valtail); | |
2786 | ||
8ccc31eb | 2787 | if (val == error_mark_node) |
863adfc0 | 2788 | return error_mark_node; |
8ccc31eb | 2789 | |
8d08fdba MS |
2790 | if (type == void_type_node) |
2791 | { | |
2792 | if (fndecl) | |
2793 | { | |
fc378698 MS |
2794 | cp_error_at ("too many arguments to %s `%+D'", called_thing, |
2795 | fndecl); | |
8d08fdba MS |
2796 | error ("at this point in file"); |
2797 | } | |
2798 | else | |
2799 | error ("too many arguments to function"); | |
2800 | /* In case anybody wants to know if this argument | |
2801 | list is valid. */ | |
2802 | if (result) | |
2803 | TREE_TYPE (tree_last (result)) = error_mark_node; | |
2804 | break; | |
2805 | } | |
2806 | ||
2807 | /* The tree type of the parameter being passed may not yet be | |
2808 | known. In this case, its type is TYPE_UNKNOWN, and will | |
2809 | be instantiated by the type given by TYPE. If TYPE | |
2810 | is also NULL, the tree type of VAL is ERROR_MARK_NODE. */ | |
2811 | if (type && type_unknown_p (val)) | |
2812 | val = require_instantiated_type (type, val, integer_zero_node); | |
2813 | else if (type_unknown_p (val)) | |
2814 | { | |
2815 | /* Strip the `&' from an overloaded FUNCTION_DECL. */ | |
2816 | if (TREE_CODE (val) == ADDR_EXPR) | |
2817 | val = TREE_OPERAND (val, 0); | |
056c014d JM |
2818 | if (really_overloaded_fn (val)) |
2819 | cp_error ("insufficient type information to resolve address of overloaded function `%D'", | |
2820 | DECL_NAME (get_first_fn (val))); | |
8d08fdba | 2821 | else |
056c014d JM |
2822 | error ("insufficient type information in parameter list"); |
2823 | val = integer_zero_node; | |
8d08fdba | 2824 | } |
51c184be MS |
2825 | else if (TREE_CODE (val) == OFFSET_REF |
2826 | && TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) | |
2827 | { | |
e92cc029 | 2828 | /* This is unclean. Should be handled elsewhere. */ |
51c184be MS |
2829 | val = build_unary_op (ADDR_EXPR, val, 0); |
2830 | } | |
8d08fdba MS |
2831 | else if (TREE_CODE (val) == OFFSET_REF) |
2832 | val = resolve_offset_ref (val); | |
2833 | ||
8d08fdba MS |
2834 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
2835 | Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ | |
2836 | if (TREE_CODE (val) == NOP_EXPR | |
a0a33927 MS |
2837 | && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) |
2838 | && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) | |
8d08fdba MS |
2839 | val = TREE_OPERAND (val, 0); |
2840 | ||
00595019 MS |
2841 | if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE) |
2842 | { | |
2843 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
8d08fdba | 2844 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE |
00595019 MS |
2845 | || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) |
2846 | val = default_conversion (val); | |
8d08fdba | 2847 | |
00595019 MS |
2848 | val = require_complete_type (val); |
2849 | } | |
8d08fdba MS |
2850 | |
2851 | if (val == error_mark_node) | |
863adfc0 | 2852 | return error_mark_node; |
8d08fdba | 2853 | |
8d08fdba MS |
2854 | if (type != 0) |
2855 | { | |
2856 | /* Formal parm type is specified by a function prototype. */ | |
2857 | tree parmval; | |
2858 | ||
e76a2646 | 2859 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba MS |
2860 | { |
2861 | error ("parameter type of called function is incomplete"); | |
2862 | parmval = val; | |
2863 | } | |
2864 | else | |
2865 | { | |
9a3b49ac MS |
2866 | parmval = convert_for_initialization |
2867 | (return_loc, type, val, flags, | |
2868 | "argument passing", fndecl, i); | |
8d08fdba MS |
2869 | #ifdef PROMOTE_PROTOTYPES |
2870 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2871 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2872 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2873 | parmval = default_conversion (parmval); | |
2874 | #endif | |
2875 | } | |
878cd289 MS |
2876 | |
2877 | if (parmval == error_mark_node) | |
2878 | return error_mark_node; | |
2879 | ||
e66d884e | 2880 | result = expr_tree_cons (NULL_TREE, parmval, result); |
8d08fdba MS |
2881 | } |
2882 | else | |
2883 | { | |
2884 | if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE) | |
2885 | val = convert_from_reference (val); | |
2886 | ||
2887 | if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2888 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2889 | < TYPE_PRECISION (double_type_node))) | |
2890 | /* Convert `float' to `double'. */ | |
e66d884e | 2891 | result = expr_tree_cons (NULL_TREE, cp_convert (double_type_node, val), result); |
8d08fdba | 2892 | else if (TYPE_LANG_SPECIFIC (TREE_TYPE (val)) |
e8abc66f | 2893 | && ! TYPE_HAS_TRIVIAL_INIT_REF (TREE_TYPE (val))) |
8d08fdba MS |
2894 | { |
2895 | cp_warning ("cannot pass objects of type `%T' through `...'", | |
2896 | TREE_TYPE (val)); | |
e66d884e | 2897 | result = expr_tree_cons (NULL_TREE, val, result); |
8d08fdba MS |
2898 | } |
2899 | else | |
2900 | /* Convert `short' and `char' to full-size `int'. */ | |
e66d884e | 2901 | result = expr_tree_cons (NULL_TREE, default_conversion (val), result); |
8d08fdba MS |
2902 | } |
2903 | ||
8d08fdba MS |
2904 | if (typetail) |
2905 | typetail = TREE_CHAIN (typetail); | |
2906 | } | |
2907 | ||
2908 | if (typetail != 0 && typetail != void_list_node) | |
2909 | { | |
2910 | /* See if there are default arguments that can be used */ | |
2911 | if (TREE_PURPOSE (typetail)) | |
2912 | { | |
f376e137 | 2913 | for (; typetail != void_list_node; ++i) |
8d08fdba MS |
2914 | { |
2915 | tree type = TREE_VALUE (typetail); | |
878cd289 | 2916 | tree val = break_out_target_exprs (TREE_PURPOSE (typetail)); |
8d08fdba MS |
2917 | tree parmval; |
2918 | ||
2919 | if (val == NULL_TREE) | |
2920 | parmval = error_mark_node; | |
2921 | else if (TREE_CODE (val) == CONSTRUCTOR) | |
2922 | { | |
2923 | parmval = digest_init (type, val, (tree *)0); | |
2924 | parmval = convert_for_initialization (return_loc, type, parmval, flags, | |
2925 | "default constructor", fndecl, i); | |
2926 | } | |
2927 | else | |
2928 | { | |
2929 | /* This could get clobbered by the following call. */ | |
2930 | if (TREE_HAS_CONSTRUCTOR (val)) | |
2931 | val = copy_node (val); | |
2932 | ||
2933 | parmval = convert_for_initialization (return_loc, type, val, flags, | |
2934 | "default argument", fndecl, i); | |
2935 | #ifdef PROMOTE_PROTOTYPES | |
2936 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2937 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2938 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2939 | parmval = default_conversion (parmval); | |
2940 | #endif | |
2941 | } | |
8d08fdba | 2942 | |
878cd289 MS |
2943 | if (parmval == error_mark_node) |
2944 | return error_mark_node; | |
2945 | ||
e66d884e | 2946 | result = expr_tree_cons (0, parmval, result); |
8d08fdba MS |
2947 | typetail = TREE_CHAIN (typetail); |
2948 | /* ends with `...'. */ | |
2949 | if (typetail == NULL_TREE) | |
2950 | break; | |
2951 | } | |
2952 | } | |
2953 | else | |
2954 | { | |
2955 | if (fndecl) | |
2956 | { | |
2957 | char *buf = (char *)alloca (32 + strlen (called_thing)); | |
2958 | sprintf (buf, "too few arguments to %s `%%#D'", called_thing); | |
2959 | cp_error_at (buf, fndecl); | |
2960 | error ("at this point in file"); | |
2961 | } | |
2962 | else | |
2963 | error ("too few arguments to function"); | |
2964 | return error_mark_list; | |
2965 | } | |
2966 | } | |
8d08fdba MS |
2967 | |
2968 | return nreverse (result); | |
2969 | } | |
2970 | \f | |
2971 | /* Build a binary-operation expression, after performing default | |
2972 | conversions on the operands. CODE is the kind of expression to build. */ | |
2973 | ||
2974 | tree | |
2975 | build_x_binary_op (code, arg1, arg2) | |
2976 | enum tree_code code; | |
2977 | tree arg1, arg2; | |
2978 | { | |
5566b478 MS |
2979 | tree rval; |
2980 | ||
5156628f | 2981 | if (processing_template_decl) |
5566b478 MS |
2982 | return build_min_nt (code, arg1, arg2); |
2983 | ||
c73964b2 MS |
2984 | if (flag_ansi_overloading) |
2985 | return build_new_op (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); | |
2986 | ||
5566b478 MS |
2987 | rval = build_opfncall (code, LOOKUP_SPECULATIVELY, |
2988 | arg1, arg2, NULL_TREE); | |
8d08fdba MS |
2989 | if (rval) |
2990 | return build_opfncall (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); | |
2991 | if (code == MEMBER_REF) | |
2992 | return build_m_component_ref (build_indirect_ref (arg1, NULL_PTR), | |
2993 | arg2); | |
2994 | return build_binary_op (code, arg1, arg2, 1); | |
2995 | } | |
2996 | ||
2997 | tree | |
2998 | build_binary_op (code, arg1, arg2, convert_p) | |
2999 | enum tree_code code; | |
3000 | tree arg1, arg2; | |
3001 | int convert_p; | |
3002 | { | |
8d08fdba MS |
3003 | tree args[2]; |
3004 | ||
3005 | args[0] = arg1; | |
3006 | args[1] = arg2; | |
3007 | ||
3008 | if (convert_p) | |
3009 | { | |
b7484fbe | 3010 | tree type0, type1; |
a9aedbc2 MS |
3011 | args[0] = decay_conversion (args[0]); |
3012 | args[1] = decay_conversion (args[1]); | |
8d08fdba | 3013 | |
b7484fbe MS |
3014 | if (args[0] == error_mark_node || args[1] == error_mark_node) |
3015 | return error_mark_node; | |
3016 | ||
3017 | type0 = TREE_TYPE (args[0]); | |
3018 | type1 = TREE_TYPE (args[1]); | |
3019 | ||
8d08fdba MS |
3020 | if (type_unknown_p (args[0])) |
3021 | { | |
b7484fbe | 3022 | args[0] = instantiate_type (type1, args[0], 1); |
a9aedbc2 | 3023 | args[0] = decay_conversion (args[0]); |
8d08fdba MS |
3024 | } |
3025 | else if (type_unknown_p (args[1])) | |
3026 | { | |
b7484fbe | 3027 | args[1] = require_instantiated_type (type0, args[1], |
8d08fdba | 3028 | error_mark_node); |
a9aedbc2 | 3029 | args[1] = decay_conversion (args[1]); |
8d08fdba MS |
3030 | } |
3031 | ||
b7484fbe | 3032 | if (IS_AGGR_TYPE (type0) || IS_AGGR_TYPE (type1)) |
8d08fdba MS |
3033 | { |
3034 | /* Try to convert this to something reasonable. */ | |
3035 | if (! build_default_binary_type_conversion(code, &args[0], &args[1])) | |
8d08fdba MS |
3036 | { |
3037 | cp_error ("no match for `%O(%#T, %#T)'", code, | |
21474714 | 3038 | TREE_TYPE (arg1), TREE_TYPE (arg2)); |
8d08fdba MS |
3039 | return error_mark_node; |
3040 | } | |
8d08fdba MS |
3041 | } |
3042 | } | |
3043 | return build_binary_op_nodefault (code, args[0], args[1], code); | |
3044 | } | |
3045 | ||
3046 | /* Build a binary-operation expression without default conversions. | |
3047 | CODE is the kind of expression to build. | |
3048 | This function differs from `build' in several ways: | |
3049 | the data type of the result is computed and recorded in it, | |
3050 | warnings are generated if arg data types are invalid, | |
3051 | special handling for addition and subtraction of pointers is known, | |
3052 | and some optimization is done (operations on narrow ints | |
3053 | are done in the narrower type when that gives the same result). | |
3054 | Constant folding is also done before the result is returned. | |
3055 | ||
3056 | ERROR_CODE is the code that determines what to say in error messages. | |
3057 | It is usually, but not always, the same as CODE. | |
3058 | ||
3059 | Note that the operands will never have enumeral types | |
3060 | because either they have just had the default conversions performed | |
3061 | or they have both just been converted to some other type in which | |
3062 | the arithmetic is to be done. | |
3063 | ||
3064 | C++: must do special pointer arithmetic when implementing | |
3065 | multiple inheritance, and deal with pointer to member functions. */ | |
3066 | ||
3067 | tree | |
39211cd5 | 3068 | build_binary_op_nodefault (code, orig_op0, orig_op1, error_code) |
8d08fdba | 3069 | enum tree_code code; |
39211cd5 | 3070 | tree orig_op0, orig_op1; |
8d08fdba MS |
3071 | enum tree_code error_code; |
3072 | { | |
39211cd5 MS |
3073 | tree op0, op1; |
3074 | register enum tree_code code0, code1; | |
3075 | tree type0, type1; | |
8d08fdba MS |
3076 | |
3077 | /* Expression code to give to the expression when it is built. | |
3078 | Normally this is CODE, which is what the caller asked for, | |
3079 | but in some special cases we change it. */ | |
3080 | register enum tree_code resultcode = code; | |
3081 | ||
3082 | /* Data type in which the computation is to be performed. | |
3083 | In the simplest cases this is the common type of the arguments. */ | |
3084 | register tree result_type = NULL; | |
3085 | ||
3086 | /* Nonzero means operands have already been type-converted | |
3087 | in whatever way is necessary. | |
3088 | Zero means they need to be converted to RESULT_TYPE. */ | |
3089 | int converted = 0; | |
3090 | ||
28cbf42c MS |
3091 | /* Nonzero means create the expression with this type, rather than |
3092 | RESULT_TYPE. */ | |
3093 | tree build_type = 0; | |
3094 | ||
8d08fdba | 3095 | /* Nonzero means after finally constructing the expression |
faae18ab | 3096 | convert it to this type. */ |
8d08fdba MS |
3097 | tree final_type = 0; |
3098 | ||
3099 | /* Nonzero if this is an operation like MIN or MAX which can | |
3100 | safely be computed in short if both args are promoted shorts. | |
3101 | Also implies COMMON. | |
3102 | -1 indicates a bitwise operation; this makes a difference | |
3103 | in the exact conditions for when it is safe to do the operation | |
3104 | in a narrower mode. */ | |
3105 | int shorten = 0; | |
3106 | ||
3107 | /* Nonzero if this is a comparison operation; | |
3108 | if both args are promoted shorts, compare the original shorts. | |
3109 | Also implies COMMON. */ | |
3110 | int short_compare = 0; | |
3111 | ||
3112 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
3113 | original short and then promoted if the operand is a promoted short. */ | |
3114 | int short_shift = 0; | |
3115 | ||
3116 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
3117 | int common = 0; | |
3118 | ||
39211cd5 | 3119 | /* Apply default conversions. */ |
a9aedbc2 MS |
3120 | if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR |
3121 | || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR | |
3122 | || code == TRUTH_XOR_EXPR) | |
3123 | { | |
3124 | op0 = decay_conversion (orig_op0); | |
3125 | op1 = decay_conversion (orig_op1); | |
3126 | } | |
3127 | else | |
3128 | { | |
3129 | op0 = default_conversion (orig_op0); | |
3130 | op1 = default_conversion (orig_op1); | |
3131 | } | |
39211cd5 MS |
3132 | |
3133 | type0 = TREE_TYPE (op0); | |
3134 | type1 = TREE_TYPE (op1); | |
3135 | ||
3136 | /* The expression codes of the data types of the arguments tell us | |
3137 | whether the arguments are integers, floating, pointers, etc. */ | |
3138 | code0 = TREE_CODE (type0); | |
3139 | code1 = TREE_CODE (type1); | |
3140 | ||
8d08fdba MS |
3141 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
3142 | STRIP_TYPE_NOPS (op0); | |
3143 | STRIP_TYPE_NOPS (op1); | |
3144 | ||
3145 | /* If an error was already reported for one of the arguments, | |
3146 | avoid reporting another error. */ | |
3147 | ||
3148 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
3149 | return error_mark_node; | |
3150 | ||
3151 | switch (code) | |
3152 | { | |
3153 | case PLUS_EXPR: | |
3154 | /* Handle the pointer + int case. */ | |
3155 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3156 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
3157 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
3158 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
3159 | else | |
3160 | common = 1; | |
3161 | break; | |
3162 | ||
3163 | case MINUS_EXPR: | |
3164 | /* Subtraction of two similar pointers. | |
3165 | We must subtract them as integers, then divide by object size. */ | |
3166 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
3167 | && comp_target_types (type0, type1, 1)) | |
3168 | return pointer_diff (op0, op1); | |
3169 | /* Handle pointer minus int. Just like pointer plus int. */ | |
3170 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3171 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
3172 | else | |
3173 | common = 1; | |
3174 | break; | |
3175 | ||
3176 | case MULT_EXPR: | |
3177 | common = 1; | |
3178 | break; | |
3179 | ||
3180 | case TRUNC_DIV_EXPR: | |
3181 | case CEIL_DIV_EXPR: | |
3182 | case FLOOR_DIV_EXPR: | |
3183 | case ROUND_DIV_EXPR: | |
3184 | case EXACT_DIV_EXPR: | |
37c46b43 MS |
3185 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
3186 | || code0 == COMPLEX_TYPE) | |
3187 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
3188 | || code1 == COMPLEX_TYPE)) | |
8d08fdba | 3189 | { |
a0a33927 | 3190 | if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) |
5b605f68 | 3191 | cp_warning ("division by zero in `%E / 0'", op0); |
a0a33927 | 3192 | else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1)) |
5b605f68 | 3193 | cp_warning ("division by zero in `%E / 0.'", op0); |
a0a33927 | 3194 | |
8d08fdba MS |
3195 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) |
3196 | resultcode = RDIV_EXPR; | |
3197 | else | |
3198 | /* When dividing two signed integers, we have to promote to int. | |
ddd5a7c1 | 3199 | unless we divide by a constant != -1. Note that default |
8d08fdba MS |
3200 | conversion will have been performed on the operands at this |
3201 | point, so we have to dig out the original type to find out if | |
3202 | it was unsigned. */ | |
3203 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3204 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3205 | || (TREE_CODE (op1) == INTEGER_CST | |
3206 | && (TREE_INT_CST_LOW (op1) != -1 | |
3207 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3208 | common = 1; | |
3209 | } | |
3210 | break; | |
3211 | ||
3212 | case BIT_AND_EXPR: | |
3213 | case BIT_ANDTC_EXPR: | |
3214 | case BIT_IOR_EXPR: | |
3215 | case BIT_XOR_EXPR: | |
3216 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3217 | shorten = -1; | |
3218 | /* If one operand is a constant, and the other is a short type | |
3219 | that has been converted to an int, | |
3220 | really do the work in the short type and then convert the | |
3221 | result to int. If we are lucky, the constant will be 0 or 1 | |
3222 | in the short type, making the entire operation go away. */ | |
3223 | if (TREE_CODE (op0) == INTEGER_CST | |
3224 | && TREE_CODE (op1) == NOP_EXPR | |
3225 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
3226 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
3227 | { | |
3228 | final_type = result_type; | |
3229 | op1 = TREE_OPERAND (op1, 0); | |
3230 | result_type = TREE_TYPE (op1); | |
3231 | } | |
3232 | if (TREE_CODE (op1) == INTEGER_CST | |
3233 | && TREE_CODE (op0) == NOP_EXPR | |
3234 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
3235 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3236 | { | |
3237 | final_type = result_type; | |
3238 | op0 = TREE_OPERAND (op0, 0); | |
3239 | result_type = TREE_TYPE (op0); | |
3240 | } | |
3241 | break; | |
3242 | ||
3243 | case TRUNC_MOD_EXPR: | |
3244 | case FLOOR_MOD_EXPR: | |
a0a33927 | 3245 | if (code1 == INTEGER_TYPE && integer_zerop (op1)) |
5b605f68 | 3246 | cp_warning ("division by zero in `%E % 0'", op0); |
a0a33927 | 3247 | else if (code1 == REAL_TYPE && real_zerop (op1)) |
5b605f68 | 3248 | cp_warning ("division by zero in `%E % 0.'", op0); |
a0a33927 | 3249 | |
8d08fdba MS |
3250 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
3251 | { | |
3252 | /* Although it would be tempting to shorten always here, that loses | |
3253 | on some targets, since the modulo instruction is undefined if the | |
3254 | quotient can't be represented in the computation mode. We shorten | |
3255 | only if unsigned or if dividing by something we know != -1. */ | |
3256 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3257 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3258 | || (TREE_CODE (op1) == INTEGER_CST | |
3259 | && (TREE_INT_CST_LOW (op1) != -1 | |
3260 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3261 | common = 1; | |
3262 | } | |
3263 | break; | |
3264 | ||
3265 | case TRUTH_ANDIF_EXPR: | |
3266 | case TRUTH_ORIF_EXPR: | |
3267 | case TRUTH_AND_EXPR: | |
3268 | case TRUTH_OR_EXPR: | |
255512c1 | 3269 | result_type = boolean_type_node; |
8d08fdba MS |
3270 | break; |
3271 | ||
3272 | /* Shift operations: result has same type as first operand; | |
3273 | always convert second operand to int. | |
3274 | Also set SHORT_SHIFT if shifting rightward. */ | |
3275 | ||
3276 | case RSHIFT_EXPR: | |
3277 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3278 | { | |
3279 | result_type = type0; | |
3280 | if (TREE_CODE (op1) == INTEGER_CST) | |
3281 | { | |
3282 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3283 | warning ("right shift count is negative"); | |
3284 | else | |
3285 | { | |
3286 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
3287 | short_shift = 1; | |
3288 | if (TREE_INT_CST_HIGH (op1) != 0 | |
3289 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3290 | >= TYPE_PRECISION (type0))) | |
3291 | warning ("right shift count >= width of type"); | |
3292 | } | |
3293 | } | |
3294 | /* Convert the shift-count to an integer, regardless of | |
3295 | size of value being shifted. */ | |
3296 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
37c46b43 | 3297 | op1 = cp_convert (integer_type_node, op1); |
8d08fdba MS |
3298 | /* Avoid converting op1 to result_type later. */ |
3299 | converted = 1; | |
3300 | } | |
3301 | break; | |
3302 | ||
3303 | case LSHIFT_EXPR: | |
3304 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3305 | { | |
3306 | result_type = type0; | |
3307 | if (TREE_CODE (op1) == INTEGER_CST) | |
3308 | { | |
3309 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3310 | warning ("left shift count is negative"); | |
3311 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3312 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3313 | >= TYPE_PRECISION (type0))) | |
3314 | warning ("left shift count >= width of type"); | |
3315 | } | |
3316 | /* Convert the shift-count to an integer, regardless of | |
3317 | size of value being shifted. */ | |
3318 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
37c46b43 | 3319 | op1 = cp_convert (integer_type_node, op1); |
8d08fdba MS |
3320 | /* Avoid converting op1 to result_type later. */ |
3321 | converted = 1; | |
3322 | } | |
3323 | break; | |
3324 | ||
3325 | case RROTATE_EXPR: | |
3326 | case LROTATE_EXPR: | |
3327 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3328 | { | |
3329 | result_type = type0; | |
3330 | if (TREE_CODE (op1) == INTEGER_CST) | |
3331 | { | |
3332 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3333 | warning ("%s rotate count is negative", | |
3334 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3335 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3336 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3337 | >= TYPE_PRECISION (type0))) | |
3338 | warning ("%s rotate count >= width of type", | |
3339 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3340 | } | |
3341 | /* Convert the shift-count to an integer, regardless of | |
3342 | size of value being shifted. */ | |
3343 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
37c46b43 | 3344 | op1 = cp_convert (integer_type_node, op1); |
8d08fdba MS |
3345 | } |
3346 | break; | |
3347 | ||
3348 | case EQ_EXPR: | |
3349 | case NE_EXPR: | |
28cbf42c | 3350 | build_type = boolean_type_node; |
37c46b43 MS |
3351 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE |
3352 | || code0 == COMPLEX_TYPE) | |
3353 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE | |
3354 | || code1 == COMPLEX_TYPE)) | |
8d08fdba MS |
3355 | short_compare = 1; |
3356 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3357 | { | |
3358 | register tree tt0 = TYPE_MAIN_VARIANT (TREE_TYPE (type0)); | |
3359 | register tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (type1)); | |
28cbf42c MS |
3360 | |
3361 | if (comp_target_types (type0, type1, 1)) | |
3362 | result_type = common_type (type0, type1); | |
8d08fdba MS |
3363 | else if (tt0 == void_type_node) |
3364 | { | |
a4443a08 MS |
3365 | if (pedantic && TREE_CODE (tt1) == FUNCTION_TYPE |
3366 | && tree_int_cst_lt (TYPE_SIZE (type0), TYPE_SIZE (type1))) | |
8d08fdba | 3367 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
b7484fbe MS |
3368 | else if (TREE_CODE (tt1) == OFFSET_TYPE) |
3369 | pedwarn ("ANSI C++ forbids conversion of a pointer to member to `void *'"); | |
8d08fdba MS |
3370 | } |
3371 | else if (tt1 == void_type_node) | |
3372 | { | |
a4443a08 MS |
3373 | if (pedantic && TREE_CODE (tt0) == FUNCTION_TYPE |
3374 | && tree_int_cst_lt (TYPE_SIZE (type1), TYPE_SIZE (type0))) | |
8d08fdba MS |
3375 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
3376 | } | |
8d08fdba | 3377 | else |
2986ae00 MS |
3378 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", |
3379 | type0, type1); | |
faae18ab MS |
3380 | |
3381 | if (result_type == NULL_TREE) | |
3382 | result_type = ptr_type_node; | |
8d08fdba MS |
3383 | } |
3384 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3385 | && integer_zerop (op1)) | |
faae18ab | 3386 | result_type = type0; |
8d08fdba MS |
3387 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3388 | && integer_zerop (op0)) | |
faae18ab | 3389 | result_type = type1; |
8d08fdba MS |
3390 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3391 | { | |
faae18ab | 3392 | result_type = type0; |
8d08fdba | 3393 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3394 | } |
3395 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3396 | { | |
faae18ab | 3397 | result_type = type1; |
8d08fdba | 3398 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3399 | } |
3400 | else if (TYPE_PTRMEMFUNC_P (type0) && TREE_CODE (op1) == INTEGER_CST | |
3401 | && integer_zerop (op1)) | |
3402 | { | |
4dabb379 | 3403 | op0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba | 3404 | op1 = integer_zero_node; |
faae18ab | 3405 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3406 | } |
3407 | else if (TYPE_PTRMEMFUNC_P (type1) && TREE_CODE (op0) == INTEGER_CST | |
3408 | && integer_zerop (op0)) | |
3409 | { | |
4dabb379 | 3410 | op0 = build_component_ref (op1, index_identifier, NULL_TREE, 0); |
8d08fdba | 3411 | op1 = integer_zero_node; |
faae18ab | 3412 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3413 | } |
3414 | else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1) | |
3415 | && (TYPE_PTRMEMFUNC_FN_TYPE (type0) | |
3416 | == TYPE_PTRMEMFUNC_FN_TYPE (type1))) | |
3417 | { | |
3418 | /* The code we generate for the test is: | |
3419 | ||
3420 | (op0.index == op1.index | |
3421 | && ((op1.index != -1 && op0.delta2 == op1.delta2) | |
3422 | || op0.pfn == op1.pfn)) */ | |
3423 | ||
4dabb379 MS |
3424 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
3425 | tree index1 = save_expr (build_component_ref (op1, index_identifier, NULL_TREE, 0)); | |
8d08fdba MS |
3426 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); |
3427 | tree pfn1 = PFN_FROM_PTRMEMFUNC (op1); | |
3428 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3429 | tree delta21 = DELTA2_FROM_PTRMEMFUNC (op1); | |
3430 | tree e1, e2, e3; | |
3431 | tree integer_neg_one_node | |
e1cd6e56 | 3432 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3433 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3434 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3435 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3436 | e3 = build_binary_op (EQ_EXPR, pfn0, pfn1, 1); | |
3437 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3438 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3439 | if (code == EQ_EXPR) | |
3440 | return e2; | |
3441 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3442 | } | |
3443 | else if (TYPE_PTRMEMFUNC_P (type0) | |
3444 | && TYPE_PTRMEMFUNC_FN_TYPE (type0) == type1) | |
3445 | { | |
4dabb379 | 3446 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba MS |
3447 | tree index1; |
3448 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); | |
3449 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3450 | tree delta21 = integer_zero_node; | |
3451 | tree e1, e2, e3; | |
3452 | tree integer_neg_one_node | |
e1cd6e56 | 3453 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3454 | if (TREE_CODE (TREE_OPERAND (op1, 0)) == FUNCTION_DECL |
3455 | && DECL_VINDEX (TREE_OPERAND (op1, 0))) | |
3456 | { | |
3457 | /* Map everything down one to make room for the null pointer to member. */ | |
3458 | index1 = size_binop (PLUS_EXPR, | |
3459 | DECL_VINDEX (TREE_OPERAND (op1, 0)), | |
3460 | integer_one_node); | |
3461 | op1 = integer_zero_node; | |
3462 | delta21 = CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE (TREE_TYPE (type1))); | |
3463 | delta21 = DECL_FIELD_BITPOS (delta21); | |
3464 | delta21 = size_binop (FLOOR_DIV_EXPR, delta21, size_int (BITS_PER_UNIT)); | |
3465 | } | |
3466 | else | |
3467 | index1 = integer_neg_one_node; | |
51c184be MS |
3468 | { |
3469 | tree nop1 = build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type0), op1); | |
3470 | TREE_CONSTANT (nop1) = TREE_CONSTANT (op1); | |
3471 | op1 = nop1; | |
3472 | } | |
8d08fdba MS |
3473 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3474 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3475 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3476 | e3 = build_binary_op (EQ_EXPR, pfn0, op1, 1); | |
3477 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3478 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3479 | if (code == EQ_EXPR) | |
3480 | return e2; | |
3481 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3482 | } | |
3483 | else if (TYPE_PTRMEMFUNC_P (type1) | |
3484 | && TYPE_PTRMEMFUNC_FN_TYPE (type1) == type0) | |
3485 | { | |
3486 | return build_binary_op (code, op1, op0, 1); | |
3487 | } | |
8d08fdba MS |
3488 | break; |
3489 | ||
3490 | case MAX_EXPR: | |
3491 | case MIN_EXPR: | |
3492 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3493 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3494 | shorten = 1; | |
3495 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3496 | { | |
faae18ab MS |
3497 | if (comp_target_types (type0, type1, 1)) |
3498 | result_type = common_type (type0, type1); | |
3499 | else | |
28cbf42c MS |
3500 | { |
3501 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3502 | type0, type1); | |
3503 | result_type = ptr_type_node; | |
3504 | } | |
8d08fdba MS |
3505 | } |
3506 | break; | |
3507 | ||
3508 | case LE_EXPR: | |
3509 | case GE_EXPR: | |
3510 | case LT_EXPR: | |
3511 | case GT_EXPR: | |
28cbf42c | 3512 | build_type = boolean_type_node; |
8d08fdba MS |
3513 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
3514 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3515 | short_compare = 1; | |
3516 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3517 | { | |
faae18ab | 3518 | if (comp_target_types (type0, type1, 1)) |
28cbf42c | 3519 | result_type = common_type (type0, type1); |
faae18ab MS |
3520 | else |
3521 | { | |
3522 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3523 | type0, type1); | |
3524 | result_type = ptr_type_node; | |
3525 | } | |
8d08fdba MS |
3526 | } |
3527 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3528 | && integer_zerop (op1)) | |
faae18ab | 3529 | result_type = type0; |
8d08fdba MS |
3530 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3531 | && integer_zerop (op0)) | |
faae18ab | 3532 | result_type = type1; |
8d08fdba MS |
3533 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3534 | { | |
faae18ab | 3535 | result_type = type0; |
d22c8596 | 3536 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3537 | } |
3538 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3539 | { | |
faae18ab | 3540 | result_type = type1; |
d22c8596 | 3541 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba | 3542 | } |
8d08fdba MS |
3543 | break; |
3544 | } | |
3545 | ||
37c46b43 MS |
3546 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE || code0 == COMPLEX_TYPE) |
3547 | && | |
3548 | (code1 == INTEGER_TYPE || code1 == REAL_TYPE || code1 == COMPLEX_TYPE)) | |
8d08fdba | 3549 | { |
37c46b43 MS |
3550 | int none_complex = (code0 != COMPLEX_TYPE && code1 != COMPLEX_TYPE); |
3551 | ||
8d08fdba MS |
3552 | if (shorten || common || short_compare) |
3553 | result_type = common_type (type0, type1); | |
3554 | ||
3555 | /* For certain operations (which identify themselves by shorten != 0) | |
3556 | if both args were extended from the same smaller type, | |
3557 | do the arithmetic in that type and then extend. | |
3558 | ||
3559 | shorten !=0 and !=1 indicates a bitwise operation. | |
3560 | For them, this optimization is safe only if | |
3561 | both args are zero-extended or both are sign-extended. | |
3562 | Otherwise, we might change the result. | |
3563 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
3564 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
3565 | ||
37c46b43 | 3566 | if (shorten && none_complex) |
8d08fdba MS |
3567 | { |
3568 | int unsigned0, unsigned1; | |
3569 | tree arg0 = get_narrower (op0, &unsigned0); | |
3570 | tree arg1 = get_narrower (op1, &unsigned1); | |
3571 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
3572 | int uns = TREE_UNSIGNED (result_type); | |
3573 | tree type; | |
3574 | ||
3575 | final_type = result_type; | |
3576 | ||
3577 | /* Handle the case that OP0 does not *contain* a conversion | |
3578 | but it *requires* conversion to FINAL_TYPE. */ | |
3579 | ||
3580 | if (op0 == arg0 && TREE_TYPE (op0) != final_type) | |
3581 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3582 | if (op1 == arg1 && TREE_TYPE (op1) != final_type) | |
3583 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); | |
3584 | ||
3585 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
3586 | ||
3587 | /* For bitwise operations, signedness of nominal type | |
3588 | does not matter. Consider only how operands were extended. */ | |
3589 | if (shorten == -1) | |
3590 | uns = unsigned0; | |
3591 | ||
3592 | /* Note that in all three cases below we refrain from optimizing | |
3593 | an unsigned operation on sign-extended args. | |
3594 | That would not be valid. */ | |
3595 | ||
3596 | /* Both args variable: if both extended in same way | |
3597 | from same width, do it in that width. | |
3598 | Do it unsigned if args were zero-extended. */ | |
3599 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
3600 | < TYPE_PRECISION (result_type)) | |
3601 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3602 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
3603 | && unsigned0 == unsigned1 | |
3604 | && (unsigned0 || !uns)) | |
3605 | result_type | |
3606 | = signed_or_unsigned_type (unsigned0, | |
3607 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
3608 | else if (TREE_CODE (arg0) == INTEGER_CST | |
3609 | && (unsigned1 || !uns) | |
3610 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3611 | < TYPE_PRECISION (result_type)) | |
3612 | && (type = signed_or_unsigned_type (unsigned1, | |
3613 | TREE_TYPE (arg1)), | |
3614 | int_fits_type_p (arg0, type))) | |
3615 | result_type = type; | |
3616 | else if (TREE_CODE (arg1) == INTEGER_CST | |
3617 | && (unsigned0 || !uns) | |
3618 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
3619 | < TYPE_PRECISION (result_type)) | |
3620 | && (type = signed_or_unsigned_type (unsigned0, | |
3621 | TREE_TYPE (arg0)), | |
3622 | int_fits_type_p (arg1, type))) | |
3623 | result_type = type; | |
3624 | } | |
3625 | ||
3626 | /* Shifts can be shortened if shifting right. */ | |
3627 | ||
3628 | if (short_shift) | |
3629 | { | |
3630 | int unsigned_arg; | |
3631 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
3632 | ||
3633 | final_type = result_type; | |
3634 | ||
3635 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
3636 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3637 | ||
3638 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
db5ae43f MS |
3639 | /* We can shorten only if the shift count is less than the |
3640 | number of bits in the smaller type size. */ | |
3641 | && TREE_INT_CST_HIGH (op1) == 0 | |
3642 | && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1) | |
8d08fdba MS |
3643 | /* If arg is sign-extended and then unsigned-shifted, |
3644 | we can simulate this with a signed shift in arg's type | |
3645 | only if the extended result is at least twice as wide | |
3646 | as the arg. Otherwise, the shift could use up all the | |
3647 | ones made by sign-extension and bring in zeros. | |
3648 | We can't optimize that case at all, but in most machines | |
3649 | it never happens because available widths are 2**N. */ | |
3650 | && (!TREE_UNSIGNED (final_type) | |
3651 | || unsigned_arg | |
5566b478 | 3652 | || (((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0))) |
8d08fdba MS |
3653 | <= TYPE_PRECISION (result_type)))) |
3654 | { | |
3655 | /* Do an unsigned shift if the operand was zero-extended. */ | |
3656 | result_type | |
3657 | = signed_or_unsigned_type (unsigned_arg, | |
3658 | TREE_TYPE (arg0)); | |
3659 | /* Convert value-to-be-shifted to that type. */ | |
3660 | if (TREE_TYPE (op0) != result_type) | |
37c46b43 | 3661 | op0 = cp_convert (result_type, op0); |
8d08fdba MS |
3662 | converted = 1; |
3663 | } | |
3664 | } | |
3665 | ||
3666 | /* Comparison operations are shortened too but differently. | |
3667 | They identify themselves by setting short_compare = 1. */ | |
3668 | ||
3669 | if (short_compare) | |
3670 | { | |
3671 | /* Don't write &op0, etc., because that would prevent op0 | |
3672 | from being kept in a register. | |
3673 | Instead, make copies of the our local variables and | |
3674 | pass the copies by reference, then copy them back afterward. */ | |
3675 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
3676 | enum tree_code xresultcode = resultcode; | |
3677 | tree val | |
3678 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
3679 | if (val != 0) | |
37c46b43 | 3680 | return cp_convert (boolean_type_node, val); |
28cbf42c MS |
3681 | op0 = xop0, op1 = xop1; |
3682 | converted = 1; | |
8d08fdba MS |
3683 | resultcode = xresultcode; |
3684 | } | |
3685 | ||
2ee887f2 | 3686 | if (short_compare && warn_sign_compare) |
8d08fdba | 3687 | { |
e3417fcd MS |
3688 | int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); |
3689 | int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3690 | ||
8d08fdba MS |
3691 | int unsignedp0, unsignedp1; |
3692 | tree primop0 = get_narrower (op0, &unsignedp0); | |
3693 | tree primop1 = get_narrower (op1, &unsignedp1); | |
3694 | ||
e92cc029 | 3695 | /* Check for comparison of different enum types. */ |
72b7eeff MS |
3696 | if (flag_int_enum_equivalence == 0 |
3697 | && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE | |
3698 | && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE | |
3699 | && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0)) | |
3700 | != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1))) | |
3701 | { | |
3702 | cp_warning ("comparison between `%#T' and `%#T'", | |
3703 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1)); | |
3704 | } | |
3705 | ||
e3417fcd | 3706 | /* Give warnings for comparisons between signed and unsigned |
faae18ab | 3707 | quantities that may fail. */ |
e3417fcd MS |
3708 | /* Do the checking based on the original operand trees, so that |
3709 | casts will be considered, but default promotions won't be. */ | |
faae18ab MS |
3710 | |
3711 | /* Do not warn if the comparison is being done in a signed type, | |
3712 | since the signed type will only be chosen if it can represent | |
3713 | all the values of the unsigned type. */ | |
3714 | if (! TREE_UNSIGNED (result_type)) | |
3715 | /* OK */; | |
b19b4a78 MS |
3716 | /* Do not warn if both operands are unsigned. */ |
3717 | else if (op0_signed == op1_signed) | |
3718 | /* OK */; | |
faae18ab MS |
3719 | /* Do not warn if the signed quantity is an unsuffixed |
3720 | integer literal (or some static constant expression | |
3721 | involving such literals) and it is non-negative. */ | |
3722 | else if ((op0_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3723 | && tree_int_cst_sgn (orig_op0) >= 0) | |
3724 | || (op1_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3725 | && tree_int_cst_sgn (orig_op1) >= 0)) | |
3726 | /* OK */; | |
3727 | /* Do not warn if the comparison is an equality operation, | |
3728 | the unsigned quantity is an integral constant and it does | |
3729 | not use the most significant bit of result_type. */ | |
3730 | else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
3731 | && ((op0_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3732 | && int_fits_type_p (orig_op1, signed_type (result_type)) | |
3733 | || (op1_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3734 | && int_fits_type_p (orig_op0, signed_type (result_type)))))) | |
3735 | /* OK */; | |
3736 | else | |
e3417fcd | 3737 | warning ("comparison between signed and unsigned"); |
8d08fdba MS |
3738 | |
3739 | /* Warn if two unsigned values are being compared in a size | |
3740 | larger than their original size, and one (and only one) is the | |
3741 | result of a `~' operator. This comparison will always fail. | |
3742 | ||
3743 | Also warn if one operand is a constant, and the constant does not | |
3744 | have all bits set that are set in the ~ operand when it is | |
3745 | extended. */ | |
3746 | ||
5566b478 MS |
3747 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) |
3748 | ^ (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
8d08fdba MS |
3749 | { |
3750 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
3751 | primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); | |
3752 | if (TREE_CODE (primop1) == BIT_NOT_EXPR) | |
3753 | primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); | |
3754 | ||
3755 | if (TREE_CODE (primop0) == INTEGER_CST | |
3756 | || TREE_CODE (primop1) == INTEGER_CST) | |
3757 | { | |
3758 | tree primop; | |
3759 | HOST_WIDE_INT constant, mask; | |
3760 | int unsignedp; | |
3761 | unsigned bits; | |
3762 | ||
3763 | if (TREE_CODE (primop0) == INTEGER_CST) | |
3764 | { | |
3765 | primop = primop1; | |
3766 | unsignedp = unsignedp1; | |
3767 | constant = TREE_INT_CST_LOW (primop0); | |
3768 | } | |
3769 | else | |
3770 | { | |
3771 | primop = primop0; | |
3772 | unsignedp = unsignedp0; | |
3773 | constant = TREE_INT_CST_LOW (primop1); | |
3774 | } | |
3775 | ||
3776 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
faae18ab | 3777 | if (bits < TYPE_PRECISION (result_type) |
8d08fdba MS |
3778 | && bits < HOST_BITS_PER_LONG && unsignedp) |
3779 | { | |
3780 | mask = (~ (HOST_WIDE_INT) 0) << bits; | |
3781 | if ((mask & constant) != mask) | |
3782 | warning ("comparison of promoted ~unsigned with constant"); | |
3783 | } | |
3784 | } | |
3785 | else if (unsignedp0 && unsignedp1 | |
3786 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
faae18ab | 3787 | < TYPE_PRECISION (result_type)) |
8d08fdba | 3788 | && (TYPE_PRECISION (TREE_TYPE (primop1)) |
faae18ab | 3789 | < TYPE_PRECISION (result_type))) |
8d08fdba MS |
3790 | warning ("comparison of promoted ~unsigned with unsigned"); |
3791 | } | |
3792 | } | |
3793 | } | |
3794 | ||
3795 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
3796 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
3797 | Then the expression will be built. | |
3798 | It will be given type FINAL_TYPE if that is nonzero; | |
3799 | otherwise, it will be given type RESULT_TYPE. */ | |
3800 | ||
3801 | if (!result_type) | |
3802 | { | |
faae18ab MS |
3803 | cp_error ("invalid operands `%T' and `%T' to binary `%O'", |
3804 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), error_code); | |
8d08fdba MS |
3805 | return error_mark_node; |
3806 | } | |
3807 | ||
3808 | if (! converted) | |
3809 | { | |
3810 | if (TREE_TYPE (op0) != result_type) | |
37c46b43 | 3811 | op0 = cp_convert (result_type, op0); |
8d08fdba | 3812 | if (TREE_TYPE (op1) != result_type) |
37c46b43 | 3813 | op1 = cp_convert (result_type, op1); |
8d08fdba MS |
3814 | } |
3815 | ||
28cbf42c MS |
3816 | if (build_type == NULL_TREE) |
3817 | build_type = result_type; | |
3818 | ||
8d08fdba | 3819 | { |
28cbf42c | 3820 | register tree result = build (resultcode, build_type, op0, op1); |
8d08fdba MS |
3821 | register tree folded; |
3822 | ||
3823 | folded = fold (result); | |
3824 | if (folded == result) | |
3825 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3826 | if (final_type != 0) | |
37c46b43 | 3827 | return cp_convert (final_type, folded); |
8d08fdba MS |
3828 | return folded; |
3829 | } | |
3830 | } | |
3831 | \f | |
3832 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
3833 | of pointer PTROP and integer INTOP. */ | |
3834 | ||
3835 | static tree | |
3836 | pointer_int_sum (resultcode, ptrop, intop) | |
3837 | enum tree_code resultcode; | |
3838 | register tree ptrop, intop; | |
3839 | { | |
3840 | tree size_exp; | |
3841 | ||
3842 | register tree result; | |
3843 | register tree folded = fold (intop); | |
3844 | ||
3845 | /* The result is a pointer of the same type that is being added. */ | |
3846 | ||
3847 | register tree result_type = TREE_TYPE (ptrop); | |
3848 | ||
8d08fdba MS |
3849 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) |
3850 | { | |
3851 | if (pedantic || warn_pointer_arith) | |
3852 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic"); | |
3853 | size_exp = integer_one_node; | |
3854 | } | |
3855 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
3856 | { | |
3857 | if (pedantic || warn_pointer_arith) | |
3858 | pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic"); | |
3859 | size_exp = integer_one_node; | |
3860 | } | |
3861 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
3862 | { | |
3863 | if (pedantic || warn_pointer_arith) | |
3864 | pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic"); | |
3865 | size_exp = integer_one_node; | |
3866 | } | |
3867 | else if (TREE_CODE (TREE_TYPE (result_type)) == OFFSET_TYPE) | |
3868 | { | |
be99da77 | 3869 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3870 | pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic"); |
3871 | size_exp = integer_one_node; | |
3872 | } | |
3873 | else | |
5566b478 | 3874 | size_exp = size_in_bytes (complete_type (TREE_TYPE (result_type))); |
8d08fdba | 3875 | |
a4443a08 MS |
3876 | /* Needed to make OOPS V2R3 work. */ |
3877 | intop = folded; | |
3878 | if (TREE_CODE (intop) == INTEGER_CST | |
3879 | && TREE_INT_CST_LOW (intop) == 0 | |
3880 | && TREE_INT_CST_HIGH (intop) == 0) | |
3881 | return ptrop; | |
3882 | ||
8d08fdba MS |
3883 | /* If what we are about to multiply by the size of the elements |
3884 | contains a constant term, apply distributive law | |
3885 | and multiply that constant term separately. | |
3886 | This helps produce common subexpressions. */ | |
3887 | ||
3888 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
3889 | && ! TREE_CONSTANT (intop) | |
3890 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
3891 | && TREE_CONSTANT (size_exp)) | |
3892 | { | |
3893 | enum tree_code subcode = resultcode; | |
3894 | if (TREE_CODE (intop) == MINUS_EXPR) | |
3895 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
3896 | ptrop = build_binary_op (subcode, ptrop, TREE_OPERAND (intop, 1), 1); | |
3897 | intop = TREE_OPERAND (intop, 0); | |
3898 | } | |
3899 | ||
9e9ff709 | 3900 | /* Convert the integer argument to a type the same size as sizetype |
8d08fdba MS |
3901 | so the multiply won't overflow spuriously. */ |
3902 | ||
9e9ff709 | 3903 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)) |
37c46b43 | 3904 | intop = cp_convert (type_for_size (TYPE_PRECISION (sizetype), 0), intop); |
8d08fdba | 3905 | |
39211cd5 MS |
3906 | /* Replace the integer argument with a suitable product by the object size. |
3907 | Do this multiplication as signed, then convert to the appropriate | |
3908 | pointer type (actually unsigned integral). */ | |
8d08fdba | 3909 | |
37c46b43 MS |
3910 | intop = cp_convert (result_type, |
3911 | build_binary_op (MULT_EXPR, intop, | |
3912 | cp_convert (TREE_TYPE (intop), size_exp), 1)); | |
8d08fdba MS |
3913 | |
3914 | /* Create the sum or difference. */ | |
3915 | ||
3916 | result = build (resultcode, result_type, ptrop, intop); | |
3917 | ||
3918 | folded = fold (result); | |
3919 | if (folded == result) | |
3920 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
3921 | return folded; | |
3922 | } | |
3923 | ||
3924 | /* Return a tree for the difference of pointers OP0 and OP1. | |
3925 | The resulting tree has type int. */ | |
3926 | ||
3927 | static tree | |
3928 | pointer_diff (op0, op1) | |
3929 | register tree op0, op1; | |
3930 | { | |
3931 | register tree result, folded; | |
3932 | tree restype = ptrdiff_type_node; | |
3933 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
3934 | ||
be99da77 | 3935 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3936 | { |
3937 | if (TREE_CODE (target_type) == VOID_TYPE) | |
3938 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction"); | |
3939 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
3940 | pedwarn ("ANSI C++ forbids using pointer to a function in subtraction"); | |
3941 | if (TREE_CODE (target_type) == METHOD_TYPE) | |
3942 | pedwarn ("ANSI C++ forbids using pointer to a method in subtraction"); | |
3943 | if (TREE_CODE (target_type) == OFFSET_TYPE) | |
3944 | pedwarn ("ANSI C++ forbids using pointer to a member in subtraction"); | |
3945 | } | |
3946 | ||
3947 | /* First do the subtraction as integers; | |
3948 | then drop through to build the divide operator. */ | |
3949 | ||
3950 | op0 = build_binary_op (MINUS_EXPR, | |
37c46b43 | 3951 | cp_convert (restype, op0), cp_convert (restype, op1), 1); |
8d08fdba MS |
3952 | |
3953 | /* This generates an error if op1 is a pointer to an incomplete type. */ | |
3954 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) | |
3955 | error ("arithmetic on pointer to an incomplete type"); | |
3956 | ||
3957 | op1 = ((TREE_CODE (target_type) == VOID_TYPE | |
3958 | || TREE_CODE (target_type) == FUNCTION_TYPE | |
3959 | || TREE_CODE (target_type) == METHOD_TYPE | |
3960 | || TREE_CODE (target_type) == OFFSET_TYPE) | |
3961 | ? integer_one_node | |
3962 | : size_in_bytes (target_type)); | |
3963 | ||
3964 | /* Do the division. */ | |
3965 | ||
37c46b43 | 3966 | result = build (EXACT_DIV_EXPR, restype, op0, cp_convert (restype, op1)); |
8d08fdba MS |
3967 | |
3968 | folded = fold (result); | |
3969 | if (folded == result) | |
3970 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3971 | return folded; | |
3972 | } | |
3973 | \f | |
3974 | /* Handle the case of taking the address of a COMPONENT_REF. | |
3975 | Called by `build_unary_op' and `build_up_reference'. | |
3976 | ||
3977 | ARG is the COMPONENT_REF whose address we want. | |
3978 | ARGTYPE is the pointer type that this address should have. | |
3979 | MSG is an error message to print if this COMPONENT_REF is not | |
3980 | addressable (such as a bitfield). */ | |
3981 | ||
3982 | tree | |
3983 | build_component_addr (arg, argtype, msg) | |
3984 | tree arg, argtype; | |
3985 | char *msg; | |
3986 | { | |
3987 | tree field = TREE_OPERAND (arg, 1); | |
3988 | tree basetype = decl_type_context (field); | |
3989 | tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3990 | ||
3991 | if (DECL_BIT_FIELD (field)) | |
3992 | { | |
3993 | error (msg, IDENTIFIER_POINTER (DECL_NAME (field))); | |
3994 | return error_mark_node; | |
3995 | } | |
3996 | ||
8d08fdba MS |
3997 | if (TREE_CODE (field) == FIELD_DECL |
3998 | && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
51c184be MS |
3999 | { |
4000 | /* Can't convert directly to ARGTYPE, since that | |
4001 | may have the same pointer type as one of our | |
4002 | baseclasses. */ | |
4003 | rval = build1 (NOP_EXPR, argtype, | |
4004 | convert_pointer_to (basetype, rval)); | |
8926095f | 4005 | TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0)); |
51c184be | 4006 | } |
8d08fdba MS |
4007 | else |
4008 | /* This conversion is harmless. */ | |
6060a796 | 4009 | rval = convert_force (argtype, rval, 0); |
8d08fdba MS |
4010 | |
4011 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
4012 | { | |
4013 | tree offset = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
4014 | size_int (BITS_PER_UNIT)); | |
4015 | int flag = TREE_CONSTANT (rval); | |
4016 | rval = fold (build (PLUS_EXPR, argtype, | |
37c46b43 | 4017 | rval, cp_convert (argtype, offset))); |
8d08fdba MS |
4018 | TREE_CONSTANT (rval) = flag; |
4019 | } | |
4020 | return rval; | |
4021 | } | |
4022 | ||
4023 | /* Construct and perhaps optimize a tree representation | |
4024 | for a unary operation. CODE, a tree_code, specifies the operation | |
4025 | and XARG is the operand. */ | |
4026 | ||
4027 | tree | |
4028 | build_x_unary_op (code, xarg) | |
4029 | enum tree_code code; | |
4030 | tree xarg; | |
4031 | { | |
5156628f | 4032 | if (processing_template_decl) |
5566b478 MS |
4033 | return build_min_nt (code, xarg, NULL_TREE); |
4034 | ||
8d08fdba | 4035 | /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an |
e92cc029 | 4036 | error message. */ |
db5ae43f | 4037 | if (code == ADDR_EXPR |
386b8a85 | 4038 | && TREE_CODE (xarg) != TEMPLATE_ID_EXPR |
db5ae43f MS |
4039 | && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg))) |
4040 | && TYPE_SIZE (TREE_TYPE (xarg)) == NULL_TREE) | |
4041 | || (TREE_CODE (xarg) == OFFSET_REF))) | |
4042 | /* don't look for a function */; | |
4043 | else | |
8d08fdba | 4044 | { |
c73964b2 MS |
4045 | tree rval; |
4046 | ||
4047 | if (flag_ansi_overloading) | |
4048 | { | |
4049 | rval = build_new_op (code, LOOKUP_NORMAL, xarg, | |
8d08fdba | 4050 | NULL_TREE, NULL_TREE); |
c73964b2 MS |
4051 | if (rval || code != ADDR_EXPR) |
4052 | return rval; | |
4053 | } | |
4054 | else | |
4055 | { | |
4056 | rval = build_opfncall (code, LOOKUP_SPECULATIVELY, xarg, | |
4057 | NULL_TREE, NULL_TREE); | |
4058 | if (rval) | |
4059 | return build_opfncall (code, LOOKUP_NORMAL, xarg, | |
4060 | NULL_TREE, NULL_TREE); | |
4061 | } | |
8d08fdba | 4062 | } |
c91a56d2 MS |
4063 | |
4064 | if (code == ADDR_EXPR) | |
4065 | { | |
4066 | if (TREE_CODE (xarg) == TARGET_EXPR) | |
4067 | warning ("taking address of temporary"); | |
4068 | } | |
4069 | ||
8d08fdba MS |
4070 | return build_unary_op (code, xarg, 0); |
4071 | } | |
4072 | ||
8ccc31eb MS |
4073 | /* Just like truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */ |
4074 | ||
2986ae00 | 4075 | tree |
8ccc31eb | 4076 | condition_conversion (expr) |
2986ae00 MS |
4077 | tree expr; |
4078 | { | |
5566b478 | 4079 | tree t; |
5156628f | 4080 | if (processing_template_decl) |
5566b478 | 4081 | return expr; |
37c46b43 | 4082 | t = cp_convert (boolean_type_node, expr); |
8ccc31eb MS |
4083 | t = fold (build1 (CLEANUP_POINT_EXPR, boolean_type_node, t)); |
4084 | return t; | |
2986ae00 | 4085 | } |
8ccc31eb | 4086 | |
8d08fdba MS |
4087 | /* C++: Must handle pointers to members. |
4088 | ||
4089 | Perhaps type instantiation should be extended to handle conversion | |
4090 | from aggregates to types we don't yet know we want? (Or are those | |
4091 | cases typically errors which should be reported?) | |
4092 | ||
4093 | NOCONVERT nonzero suppresses the default promotions | |
4094 | (such as from short to int). */ | |
e92cc029 | 4095 | |
8d08fdba MS |
4096 | tree |
4097 | build_unary_op (code, xarg, noconvert) | |
4098 | enum tree_code code; | |
4099 | tree xarg; | |
4100 | int noconvert; | |
4101 | { | |
4102 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
4103 | register tree arg = xarg; | |
4104 | register tree argtype = 0; | |
8d08fdba MS |
4105 | char *errstring = NULL; |
4106 | tree val; | |
8d08fdba | 4107 | |
b7484fbe | 4108 | if (arg == error_mark_node) |
8d08fdba MS |
4109 | return error_mark_node; |
4110 | ||
8d08fdba MS |
4111 | switch (code) |
4112 | { | |
4113 | case CONVERT_EXPR: | |
4114 | /* This is used for unary plus, because a CONVERT_EXPR | |
4115 | is enough to prevent anybody from looking inside for | |
4116 | associativity, but won't generate any code. */ | |
b7484fbe MS |
4117 | if (!(arg = build_expr_type_conversion |
4118 | (WANT_ARITH | WANT_ENUM | WANT_POINTER, arg, 1))) | |
4119 | errstring = "wrong type argument to unary plus"; | |
4120 | else | |
8d08fdba MS |
4121 | { |
4122 | if (!noconvert) | |
b7484fbe MS |
4123 | arg = default_conversion (arg); |
4124 | arg = build1 (NON_LVALUE_EXPR, TREE_TYPE (arg), arg); | |
8d08fdba | 4125 | } |
b7484fbe | 4126 | break; |
8d08fdba | 4127 | |
b7484fbe MS |
4128 | case NEGATE_EXPR: |
4129 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) | |
4130 | errstring = "wrong type argument to unary minus"; | |
8d08fdba MS |
4131 | else if (!noconvert) |
4132 | arg = default_conversion (arg); | |
4133 | break; | |
4134 | ||
4135 | case BIT_NOT_EXPR: | |
37c46b43 MS |
4136 | if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) |
4137 | { | |
4138 | code = CONJ_EXPR; | |
4139 | if (!noconvert) | |
4140 | arg = default_conversion (arg); | |
4141 | } | |
4142 | else if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM, | |
4143 | arg, 1))) | |
b7484fbe | 4144 | errstring = "wrong type argument to bit-complement"; |
8d08fdba MS |
4145 | else if (!noconvert) |
4146 | arg = default_conversion (arg); | |
4147 | break; | |
4148 | ||
4149 | case ABS_EXPR: | |
b7484fbe MS |
4150 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) |
4151 | errstring = "wrong type argument to abs"; | |
8d08fdba MS |
4152 | else if (!noconvert) |
4153 | arg = default_conversion (arg); | |
4154 | break; | |
4155 | ||
37c46b43 MS |
4156 | case CONJ_EXPR: |
4157 | /* Conjugating a real value is a no-op, but allow it anyway. */ | |
4158 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) | |
4159 | errstring = "wrong type argument to conjugation"; | |
4160 | else if (!noconvert) | |
4161 | arg = default_conversion (arg); | |
4162 | break; | |
4163 | ||
8d08fdba | 4164 | case TRUTH_NOT_EXPR: |
37c46b43 | 4165 | arg = cp_convert (boolean_type_node, arg); |
8d08fdba | 4166 | val = invert_truthvalue (arg); |
2986ae00 MS |
4167 | if (arg != error_mark_node) |
4168 | return val; | |
4169 | errstring = "in argument to unary !"; | |
8d08fdba MS |
4170 | break; |
4171 | ||
4172 | case NOP_EXPR: | |
4173 | break; | |
4174 | ||
37c46b43 MS |
4175 | case REALPART_EXPR: |
4176 | if (TREE_CODE (arg) == COMPLEX_CST) | |
4177 | return TREE_REALPART (arg); | |
4178 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
4179 | return fold (build1 (REALPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
4180 | else | |
4181 | return arg; | |
4182 | ||
4183 | case IMAGPART_EXPR: | |
4184 | if (TREE_CODE (arg) == COMPLEX_CST) | |
4185 | return TREE_IMAGPART (arg); | |
4186 | else if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
4187 | return fold (build1 (IMAGPART_EXPR, TREE_TYPE (TREE_TYPE (arg)), arg)); | |
4188 | else | |
4189 | return cp_convert (TREE_TYPE (arg), integer_zero_node); | |
4190 | ||
8d08fdba MS |
4191 | case PREINCREMENT_EXPR: |
4192 | case POSTINCREMENT_EXPR: | |
4193 | case PREDECREMENT_EXPR: | |
4194 | case POSTDECREMENT_EXPR: | |
4195 | /* Handle complex lvalues (when permitted) | |
4196 | by reduction to simpler cases. */ | |
4197 | ||
4198 | val = unary_complex_lvalue (code, arg); | |
4199 | if (val != 0) | |
4200 | return val; | |
4201 | ||
37c46b43 MS |
4202 | /* Increment or decrement the real part of the value, |
4203 | and don't change the imaginary part. */ | |
4204 | if (TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
4205 | { | |
4206 | tree real, imag; | |
4207 | ||
4208 | arg = stabilize_reference (arg); | |
4209 | real = build_unary_op (REALPART_EXPR, arg, 1); | |
4210 | imag = build_unary_op (IMAGPART_EXPR, arg, 1); | |
4211 | return build (COMPLEX_EXPR, TREE_TYPE (arg), | |
4212 | build_unary_op (code, real, 1), imag); | |
4213 | } | |
4214 | ||
8d08fdba MS |
4215 | /* Report invalid types. */ |
4216 | ||
b7484fbe MS |
4217 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER, |
4218 | arg, 1))) | |
8d08fdba MS |
4219 | { |
4220 | if (code == PREINCREMENT_EXPR) | |
4221 | errstring ="no pre-increment operator for type"; | |
4222 | else if (code == POSTINCREMENT_EXPR) | |
4223 | errstring ="no post-increment operator for type"; | |
4224 | else if (code == PREDECREMENT_EXPR) | |
4225 | errstring ="no pre-decrement operator for type"; | |
4226 | else | |
4227 | errstring ="no post-decrement operator for type"; | |
4228 | break; | |
4229 | } | |
4230 | ||
4231 | /* Report something read-only. */ | |
4232 | ||
4233 | if (TYPE_READONLY (TREE_TYPE (arg)) | |
4234 | || TREE_READONLY (arg)) | |
4235 | readonly_error (arg, ((code == PREINCREMENT_EXPR | |
4236 | || code == POSTINCREMENT_EXPR) | |
4237 | ? "increment" : "decrement"), | |
4238 | 0); | |
4239 | ||
4240 | { | |
4241 | register tree inc; | |
4242 | tree result_type = TREE_TYPE (arg); | |
4243 | ||
4244 | arg = get_unwidened (arg, 0); | |
4245 | argtype = TREE_TYPE (arg); | |
4246 | ||
4247 | /* ARM $5.2.5 last annotation says this should be forbidden. */ | |
4248 | if (TREE_CODE (argtype) == ENUMERAL_TYPE) | |
4249 | pedwarn ("ANSI C++ forbids %sing an enum", | |
4250 | (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
4251 | ? "increment" : "decrement"); | |
4252 | ||
4253 | /* Compute the increment. */ | |
4254 | ||
b7484fbe | 4255 | if (TREE_CODE (argtype) == POINTER_TYPE) |
8d08fdba MS |
4256 | { |
4257 | enum tree_code tmp = TREE_CODE (TREE_TYPE (argtype)); | |
5566b478 | 4258 | if (TYPE_SIZE (complete_type (TREE_TYPE (argtype))) == 0) |
39211cd5 MS |
4259 | cp_error ("cannot %s a pointer to incomplete type `%T'", |
4260 | ((code == PREINCREMENT_EXPR | |
4261 | || code == POSTINCREMENT_EXPR) | |
4262 | ? "increment" : "decrement"), TREE_TYPE (argtype)); | |
4263 | else if (tmp == FUNCTION_TYPE || tmp == METHOD_TYPE | |
4264 | || tmp == VOID_TYPE || tmp == OFFSET_TYPE) | |
8d08fdba | 4265 | cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'", |
39211cd5 MS |
4266 | ((code == PREINCREMENT_EXPR |
4267 | || code == POSTINCREMENT_EXPR) | |
4268 | ? "increment" : "decrement"), argtype); | |
8d08fdba MS |
4269 | inc = c_sizeof_nowarn (TREE_TYPE (argtype)); |
4270 | } | |
4271 | else | |
4272 | inc = integer_one_node; | |
4273 | ||
37c46b43 | 4274 | inc = cp_convert (argtype, inc); |
8d08fdba MS |
4275 | |
4276 | /* Handle incrementing a cast-expression. */ | |
4277 | ||
4278 | switch (TREE_CODE (arg)) | |
4279 | { | |
4280 | case NOP_EXPR: | |
4281 | case CONVERT_EXPR: | |
4282 | case FLOAT_EXPR: | |
4283 | case FIX_TRUNC_EXPR: | |
4284 | case FIX_FLOOR_EXPR: | |
4285 | case FIX_ROUND_EXPR: | |
4286 | case FIX_CEIL_EXPR: | |
4287 | { | |
72b7eeff | 4288 | tree incremented, modify, value, compound; |
f0e01782 MS |
4289 | if (! lvalue_p (arg) && pedantic) |
4290 | pedwarn ("cast to non-reference type used as lvalue"); | |
8d08fdba MS |
4291 | arg = stabilize_reference (arg); |
4292 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4293 | value = arg; | |
4294 | else | |
4295 | value = save_expr (arg); | |
4296 | incremented = build (((code == PREINCREMENT_EXPR | |
4297 | || code == POSTINCREMENT_EXPR) | |
4298 | ? PLUS_EXPR : MINUS_EXPR), | |
4299 | argtype, value, inc); | |
4300 | TREE_SIDE_EFFECTS (incremented) = 1; | |
72b7eeff | 4301 | |
8d08fdba | 4302 | modify = build_modify_expr (arg, NOP_EXPR, incremented); |
72b7eeff MS |
4303 | compound = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); |
4304 | ||
e92cc029 | 4305 | /* Eliminate warning about unused result of + or -. */ |
72b7eeff MS |
4306 | TREE_NO_UNUSED_WARNING (compound) = 1; |
4307 | return compound; | |
8d08fdba MS |
4308 | } |
4309 | } | |
4310 | ||
8d08fdba MS |
4311 | /* Complain about anything else that is not a true lvalue. */ |
4312 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
4313 | || code == POSTINCREMENT_EXPR) | |
4314 | ? "increment" : "decrement"))) | |
4315 | return error_mark_node; | |
4316 | ||
b7484fbe MS |
4317 | /* Forbid using -- on `bool'. */ |
4318 | if (TREE_TYPE (arg) == boolean_type_node) | |
4319 | { | |
4320 | if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4321 | { | |
4322 | cp_error ("invalid use of `--' on bool variable `%D'", arg); | |
4323 | return error_mark_node; | |
4324 | } | |
4325 | #if 0 | |
4326 | /* This will only work if someone can convince Kenner to accept | |
4327 | my patch to expand_increment. (jason) */ | |
4328 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4329 | #else | |
4330 | if (code == POSTINCREMENT_EXPR) | |
4331 | { | |
4332 | arg = stabilize_reference (arg); | |
4333 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4334 | boolean_true_node); | |
4335 | TREE_SIDE_EFFECTS (val) = 1; | |
4336 | arg = save_expr (arg); | |
4337 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
4338 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4339 | } | |
4340 | else | |
4341 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4342 | boolean_true_node); | |
4343 | #endif | |
4344 | } | |
4345 | else | |
4346 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4347 | ||
8d08fdba | 4348 | TREE_SIDE_EFFECTS (val) = 1; |
37c46b43 | 4349 | return cp_convert (result_type, val); |
8d08fdba MS |
4350 | } |
4351 | ||
4352 | case ADDR_EXPR: | |
4353 | /* Note that this operation never does default_conversion | |
4354 | regardless of NOCONVERT. */ | |
4355 | ||
b7484fbe MS |
4356 | argtype = TREE_TYPE (arg); |
4357 | if (TREE_CODE (argtype) == REFERENCE_TYPE) | |
8d08fdba | 4358 | { |
eb66be0e MS |
4359 | arg = build1 |
4360 | (CONVERT_EXPR, | |
4361 | build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
4362 | TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); | |
8d08fdba MS |
4363 | return arg; |
4364 | } | |
a0a33927 MS |
4365 | else if (pedantic |
4366 | && TREE_CODE (arg) == FUNCTION_DECL | |
8d08fdba MS |
4367 | && DECL_NAME (arg) |
4368 | && DECL_CONTEXT (arg) == NULL_TREE | |
4369 | && IDENTIFIER_LENGTH (DECL_NAME (arg)) == 4 | |
4370 | && IDENTIFIER_POINTER (DECL_NAME (arg))[0] == 'm' | |
4371 | && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (arg)), "main")) | |
a0a33927 MS |
4372 | /* ARM $3.4 */ |
4373 | pedwarn ("taking address of function `main'"); | |
8d08fdba MS |
4374 | |
4375 | /* Let &* cancel out to simplify resulting code. */ | |
4376 | if (TREE_CODE (arg) == INDIRECT_REF) | |
4377 | { | |
4ac14744 | 4378 | /* We don't need to have `current_class_ptr' wrapped in a |
8d08fdba | 4379 | NON_LVALUE_EXPR node. */ |
4ac14744 MS |
4380 | if (arg == current_class_ref) |
4381 | return current_class_ptr; | |
8d08fdba | 4382 | |
8d08fdba MS |
4383 | arg = TREE_OPERAND (arg, 0); |
4384 | if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) | |
4385 | { | |
eb66be0e MS |
4386 | arg = build1 |
4387 | (CONVERT_EXPR, | |
4388 | build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
8d08fdba MS |
4389 | TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); |
4390 | } | |
4391 | else if (lvalue_p (arg)) | |
4392 | /* Don't let this be an lvalue. */ | |
4393 | return non_lvalue (arg); | |
4394 | return arg; | |
4395 | } | |
4396 | ||
4397 | /* For &x[y], return x+y */ | |
4398 | if (TREE_CODE (arg) == ARRAY_REF) | |
4399 | { | |
4400 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
4401 | return error_mark_node; | |
4402 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
4403 | TREE_OPERAND (arg, 1), 1); | |
4404 | } | |
4405 | ||
8d08fdba MS |
4406 | /* Uninstantiated types are all functions. Taking the |
4407 | address of a function is a no-op, so just return the | |
4408 | argument. */ | |
4409 | ||
4410 | if (TREE_CODE (arg) == IDENTIFIER_NODE | |
4411 | && IDENTIFIER_OPNAME_P (arg)) | |
4412 | { | |
4413 | my_friendly_abort (117); | |
4414 | /* We don't know the type yet, so just work around the problem. | |
4415 | We know that this will resolve to an lvalue. */ | |
4416 | return build1 (ADDR_EXPR, unknown_type_node, arg); | |
4417 | } | |
4418 | ||
4419 | if (TREE_CODE (arg) == TREE_LIST) | |
4420 | { | |
f376e137 MS |
4421 | if (TREE_CODE (TREE_VALUE (arg)) == FUNCTION_DECL |
4422 | && DECL_CHAIN (TREE_VALUE (arg)) == NULL_TREE) | |
4423 | /* Unique overloaded non-member function. */ | |
4424 | return build_unary_op (ADDR_EXPR, TREE_VALUE (arg), 0); | |
8d08fdba MS |
4425 | if (TREE_CHAIN (arg) == NULL_TREE |
4426 | && TREE_CODE (TREE_VALUE (arg)) == TREE_LIST | |
4427 | && DECL_CHAIN (TREE_VALUE (TREE_VALUE (arg))) == NULL_TREE) | |
f376e137 MS |
4428 | /* Unique overloaded member function. */ |
4429 | return build_unary_op (ADDR_EXPR, TREE_VALUE (TREE_VALUE (arg)), | |
4430 | 0); | |
8d08fdba MS |
4431 | return build1 (ADDR_EXPR, unknown_type_node, arg); |
4432 | } | |
386b8a85 JM |
4433 | else if (TREE_CODE (arg) == TEMPLATE_ID_EXPR) |
4434 | { | |
4435 | tree targs; | |
4436 | tree fn; | |
4437 | ||
4438 | /* We don't require a match here; it's possible that the | |
4439 | context (like a cast to a particular type) will resolve | |
4440 | the particular choice of template. */ | |
4441 | fn = determine_explicit_specialization (arg, NULL_TREE, | |
4442 | &targs, | |
4443 | 0, 0); | |
4444 | ||
4445 | if (fn) | |
4446 | { | |
4447 | fn = instantiate_template (fn, targs); | |
4448 | mark_addressable (fn); | |
4449 | return build_unary_op (ADDR_EXPR, fn, 0); | |
4450 | } | |
4451 | ||
4452 | return build1 (ADDR_EXPR, unknown_type_node, arg); | |
4453 | } | |
8d08fdba MS |
4454 | |
4455 | /* Handle complex lvalues (when permitted) | |
4456 | by reduction to simpler cases. */ | |
4457 | val = unary_complex_lvalue (code, arg); | |
4458 | if (val != 0) | |
4459 | return val; | |
4460 | ||
8d08fdba MS |
4461 | switch (TREE_CODE (arg)) |
4462 | { | |
4463 | case NOP_EXPR: | |
4464 | case CONVERT_EXPR: | |
4465 | case FLOAT_EXPR: | |
4466 | case FIX_TRUNC_EXPR: | |
4467 | case FIX_FLOOR_EXPR: | |
4468 | case FIX_ROUND_EXPR: | |
4469 | case FIX_CEIL_EXPR: | |
f0e01782 MS |
4470 | if (! lvalue_p (arg) && pedantic) |
4471 | pedwarn ("taking the address of a cast to non-reference type"); | |
8d08fdba | 4472 | } |
8d08fdba MS |
4473 | |
4474 | /* Allow the address of a constructor if all the elements | |
4475 | are constant. */ | |
4476 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
4477 | ; | |
4478 | /* Anything not already handled and not a true memory reference | |
4479 | is an error. */ | |
b7484fbe MS |
4480 | else if (TREE_CODE (argtype) != FUNCTION_TYPE |
4481 | && TREE_CODE (argtype) != METHOD_TYPE | |
8d08fdba MS |
4482 | && !lvalue_or_else (arg, "unary `&'")) |
4483 | return error_mark_node; | |
4484 | ||
4485 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
8d08fdba MS |
4486 | /* If the lvalue is const or volatile, |
4487 | merge that into the type that the address will point to. */ | |
4488 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
4489 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
4490 | { | |
4491 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
f376e137 | 4492 | argtype = cp_build_type_variant (argtype, |
21474714 MS |
4493 | TREE_READONLY (arg), |
4494 | TREE_THIS_VOLATILE (arg)); | |
8d08fdba MS |
4495 | } |
4496 | ||
4497 | argtype = build_pointer_type (argtype); | |
4498 | ||
4499 | if (mark_addressable (arg) == 0) | |
4500 | return error_mark_node; | |
4501 | ||
4502 | { | |
4503 | tree addr; | |
4504 | ||
4505 | if (TREE_CODE (arg) == COMPONENT_REF) | |
4506 | addr = build_component_addr (arg, argtype, | |
4507 | "attempt to take address of bit-field structure member `%s'"); | |
4508 | else | |
4509 | addr = build1 (code, argtype, arg); | |
4510 | ||
4511 | /* Address of a static or external variable or | |
4512 | function counts as a constant */ | |
4513 | if (staticp (arg)) | |
4514 | TREE_CONSTANT (addr) = 1; | |
4ac14744 | 4515 | |
beb53fb8 JM |
4516 | if (TREE_CODE (argtype) == POINTER_TYPE |
4517 | && TREE_CODE (TREE_TYPE (argtype)) == METHOD_TYPE) | |
4ac14744 MS |
4518 | { |
4519 | build_ptrmemfunc_type (argtype); | |
4520 | addr = build_ptrmemfunc (argtype, addr, 0); | |
4521 | } | |
4522 | ||
8d08fdba MS |
4523 | return addr; |
4524 | } | |
4525 | } | |
4526 | ||
4527 | if (!errstring) | |
4528 | { | |
4529 | if (argtype == 0) | |
4530 | argtype = TREE_TYPE (arg); | |
4531 | return fold (build1 (code, argtype, arg)); | |
4532 | } | |
4533 | ||
4534 | error (errstring); | |
4535 | return error_mark_node; | |
4536 | } | |
4537 | ||
cffa8729 | 4538 | #if 0 |
8d08fdba MS |
4539 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, |
4540 | convert ARG with the same conversions in the same order | |
4541 | and return the result. */ | |
4542 | ||
4543 | static tree | |
4544 | convert_sequence (conversions, arg) | |
4545 | tree conversions; | |
4546 | tree arg; | |
4547 | { | |
4548 | switch (TREE_CODE (conversions)) | |
4549 | { | |
4550 | case NOP_EXPR: | |
4551 | case CONVERT_EXPR: | |
4552 | case FLOAT_EXPR: | |
4553 | case FIX_TRUNC_EXPR: | |
4554 | case FIX_FLOOR_EXPR: | |
4555 | case FIX_ROUND_EXPR: | |
4556 | case FIX_CEIL_EXPR: | |
37c46b43 MS |
4557 | return cp_convert (TREE_TYPE (conversions), |
4558 | convert_sequence (TREE_OPERAND (conversions, 0), | |
4559 | arg)); | |
8d08fdba MS |
4560 | |
4561 | default: | |
4562 | return arg; | |
4563 | } | |
4564 | } | |
cffa8729 | 4565 | #endif |
8d08fdba MS |
4566 | |
4567 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
4568 | for certain kinds of expressions which are not really lvalues | |
4569 | but which we can accept as lvalues. | |
4570 | ||
4571 | If ARG is not a kind of expression we can handle, return zero. */ | |
4572 | ||
4573 | tree | |
4574 | unary_complex_lvalue (code, arg) | |
4575 | enum tree_code code; | |
4576 | tree arg; | |
4577 | { | |
4578 | /* Handle (a, b) used as an "lvalue". */ | |
4579 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
4580 | { | |
4581 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
8d08fdba MS |
4582 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), |
4583 | TREE_OPERAND (arg, 0), real_result); | |
4584 | } | |
4585 | ||
4586 | /* Handle (a ? b : c) used as an "lvalue". */ | |
4587 | if (TREE_CODE (arg) == COND_EXPR) | |
a4443a08 MS |
4588 | return rationalize_conditional_expr (code, arg); |
4589 | ||
e1cd6e56 MS |
4590 | if (TREE_CODE (arg) == MODIFY_EXPR |
4591 | || TREE_CODE (arg) == PREINCREMENT_EXPR | |
4592 | || TREE_CODE (arg) == PREDECREMENT_EXPR) | |
a4443a08 MS |
4593 | return unary_complex_lvalue |
4594 | (code, build (COMPOUND_EXPR, TREE_TYPE (TREE_OPERAND (arg, 0)), | |
4595 | arg, TREE_OPERAND (arg, 0))); | |
8d08fdba MS |
4596 | |
4597 | if (code != ADDR_EXPR) | |
4598 | return 0; | |
4599 | ||
4600 | /* Handle (a = b) used as an "lvalue" for `&'. */ | |
4601 | if (TREE_CODE (arg) == MODIFY_EXPR | |
4602 | || TREE_CODE (arg) == INIT_EXPR) | |
4603 | { | |
4604 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); | |
faf5394a MS |
4605 | arg = build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result); |
4606 | TREE_NO_UNUSED_WARNING (arg) = 1; | |
4607 | return arg; | |
8d08fdba MS |
4608 | } |
4609 | ||
8d08fdba MS |
4610 | if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE |
4611 | || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE | |
4612 | || TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
4613 | { | |
4614 | /* The representation of something of type OFFSET_TYPE | |
4615 | is really the representation of a pointer to it. | |
4616 | Here give the representation its true type. */ | |
4617 | tree t; | |
8d08fdba MS |
4618 | |
4619 | my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313); | |
4620 | ||
4621 | if (TREE_CODE (arg) != OFFSET_REF) | |
4622 | return 0; | |
4623 | ||
4624 | t = TREE_OPERAND (arg, 1); | |
4625 | ||
e92cc029 | 4626 | if (TREE_CODE (t) == FUNCTION_DECL) /* Check all this code for right semantics. */ |
8d08fdba MS |
4627 | return build_unary_op (ADDR_EXPR, t, 0); |
4628 | if (TREE_CODE (t) == VAR_DECL) | |
4629 | return build_unary_op (ADDR_EXPR, t, 0); | |
4630 | else | |
4631 | { | |
d22c8596 MS |
4632 | tree type; |
4633 | tree offset = integer_zero_node; | |
4634 | ||
8d08fdba MS |
4635 | if (TREE_OPERAND (arg, 0) |
4636 | && (TREE_CODE (TREE_OPERAND (arg, 0)) != NOP_EXPR | |
4637 | || TREE_OPERAND (TREE_OPERAND (arg, 0), 0) != error_mark_node)) | |
8145f082 MS |
4638 | if (TREE_CODE (t) != FIELD_DECL) |
4639 | { | |
4640 | /* Don't know if this should return address to just | |
4641 | _DECL, or actual address resolved in this expression. */ | |
4642 | sorry ("address of bound pointer-to-member expression"); | |
4643 | return error_mark_node; | |
4644 | } | |
8d08fdba | 4645 | |
d22c8596 MS |
4646 | type = TREE_TYPE (TREE_OPERAND (arg, 0)); |
4647 | ||
4648 | if (TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
4649 | { | |
4650 | /* Add in the offset to the intermediate subobject, if any. */ | |
4651 | offset = get_delta_difference (TYPE_OFFSET_BASETYPE (TREE_TYPE (arg)), | |
4652 | type, | |
4653 | 0); | |
4654 | type = TYPE_OFFSET_BASETYPE (TREE_TYPE (arg)); | |
4655 | } | |
4656 | ||
4657 | /* Now in the offset to the final subobject. */ | |
4658 | offset = size_binop (PLUS_EXPR, | |
4659 | offset, | |
4660 | get_delta_difference (DECL_FIELD_CONTEXT (t), | |
4661 | type, | |
4662 | 0)); | |
c91a56d2 MS |
4663 | |
4664 | /* Add in the offset to the field. */ | |
8145f082 MS |
4665 | offset = size_binop (PLUS_EXPR, offset, |
4666 | size_binop (EASY_DIV_EXPR, | |
4667 | DECL_FIELD_BITPOS (t), | |
4668 | size_int (BITS_PER_UNIT))); | |
c91a56d2 | 4669 | |
6640eba9 | 4670 | /* We offset all pointer to data members by 1 so that we can |
c91a56d2 MS |
4671 | distinguish between a null pointer to data member and the first |
4672 | data member of a structure. */ | |
4673 | offset = size_binop (PLUS_EXPR, offset, size_int (1)); | |
4674 | ||
37c46b43 | 4675 | return cp_convert (build_pointer_type (TREE_TYPE (arg)), offset); |
8d08fdba MS |
4676 | } |
4677 | } | |
4678 | ||
c91a56d2 | 4679 | |
8d08fdba MS |
4680 | /* We permit compiler to make function calls returning |
4681 | objects of aggregate type look like lvalues. */ | |
4682 | { | |
4683 | tree targ = arg; | |
4684 | ||
4685 | if (TREE_CODE (targ) == SAVE_EXPR) | |
4686 | targ = TREE_OPERAND (targ, 0); | |
4687 | ||
4688 | if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ))) | |
4689 | { | |
4690 | if (TREE_CODE (arg) == SAVE_EXPR) | |
4691 | targ = arg; | |
4692 | else | |
5566b478 | 4693 | targ = build_cplus_new (TREE_TYPE (arg), arg); |
f30432d7 | 4694 | return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ); |
8d08fdba MS |
4695 | } |
4696 | ||
4697 | if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) | |
f30432d7 | 4698 | return build (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)), |
8d08fdba | 4699 | TREE_OPERAND (targ, 0), current_function_decl, NULL); |
8d08fdba MS |
4700 | } |
4701 | ||
4702 | /* Don't let anything else be handled specially. */ | |
4703 | return 0; | |
4704 | } | |
8d08fdba MS |
4705 | \f |
4706 | /* Mark EXP saying that we need to be able to take the | |
4707 | address of it; it should not be allocated in a register. | |
4708 | Value is 1 if successful. | |
4709 | ||
4ac14744 | 4710 | C++: we do not allow `current_class_ptr' to be addressable. */ |
8d08fdba MS |
4711 | |
4712 | int | |
4713 | mark_addressable (exp) | |
4714 | tree exp; | |
4715 | { | |
4716 | register tree x = exp; | |
4717 | ||
4718 | if (TREE_ADDRESSABLE (x) == 1) | |
4719 | return 1; | |
4720 | ||
4721 | while (1) | |
4722 | switch (TREE_CODE (x)) | |
4723 | { | |
4724 | case ADDR_EXPR: | |
4725 | case COMPONENT_REF: | |
4726 | case ARRAY_REF: | |
37c46b43 MS |
4727 | case REALPART_EXPR: |
4728 | case IMAGPART_EXPR: | |
8d08fdba MS |
4729 | x = TREE_OPERAND (x, 0); |
4730 | break; | |
4731 | ||
4732 | case PARM_DECL: | |
4ac14744 | 4733 | if (x == current_class_ptr) |
8d08fdba | 4734 | { |
9a3b49ac MS |
4735 | if (! flag_this_is_variable) |
4736 | error ("address of `this' not available"); | |
8d08fdba MS |
4737 | TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */ |
4738 | put_var_into_stack (x); | |
4739 | return 1; | |
4740 | } | |
4741 | case VAR_DECL: | |
cffa8729 | 4742 | if (TREE_STATIC (x) && TREE_READONLY (x) |
8d08fdba | 4743 | && DECL_RTL (x) != 0 |
cffa8729 | 4744 | && ! DECL_IN_MEMORY_P (x)) |
8d08fdba MS |
4745 | { |
4746 | /* We thought this would make a good constant variable, | |
4747 | but we were wrong. */ | |
4748 | push_obstacks_nochange (); | |
4749 | end_temporary_allocation (); | |
4750 | ||
4751 | TREE_ASM_WRITTEN (x) = 0; | |
4752 | DECL_RTL (x) = 0; | |
4753 | rest_of_decl_compilation (x, 0, IDENTIFIER_LOCAL_VALUE (x) == 0, 0); | |
4754 | TREE_ADDRESSABLE (x) = 1; | |
4755 | ||
4756 | pop_obstacks (); | |
4757 | ||
4758 | return 1; | |
4759 | } | |
4760 | /* Caller should not be trying to mark initialized | |
4761 | constant fields addressable. */ | |
4762 | my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0 | |
4763 | || DECL_IN_AGGR_P (x) == 0 | |
4764 | || TREE_STATIC (x) | |
4765 | || DECL_EXTERNAL (x), 314); | |
4766 | ||
4767 | case CONST_DECL: | |
4768 | case RESULT_DECL: | |
9a3b49ac MS |
4769 | if (DECL_REGISTER (x) && !TREE_ADDRESSABLE (x) |
4770 | && !DECL_ARTIFICIAL (x) && extra_warnings) | |
4771 | cp_warning ("address requested for `%D', which is declared `register'", | |
4772 | x); | |
8d08fdba MS |
4773 | put_var_into_stack (x); |
4774 | TREE_ADDRESSABLE (x) = 1; | |
4775 | return 1; | |
4776 | ||
4777 | case FUNCTION_DECL: | |
4778 | /* We have to test both conditions here. The first may | |
4779 | be non-zero in the case of processing a default function. | |
4780 | The second may be non-zero in the case of a template function. */ | |
4781 | x = DECL_MAIN_VARIANT (x); | |
386b8a85 JM |
4782 | if (DECL_TEMPLATE_INFO (x) && !DECL_TEMPLATE_SPECIALIZATION (x)) |
4783 | mark_used (x); | |
8d08fdba MS |
4784 | TREE_ADDRESSABLE (x) = 1; |
4785 | TREE_USED (x) = 1; | |
4786 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
4787 | return 1; | |
4788 | ||
e92cc029 MS |
4789 | case CONSTRUCTOR: |
4790 | TREE_ADDRESSABLE (x) = 1; | |
4791 | return 1; | |
4792 | ||
9a3b49ac MS |
4793 | case TARGET_EXPR: |
4794 | TREE_ADDRESSABLE (x) = 1; | |
4795 | mark_addressable (TREE_OPERAND (x, 0)); | |
4796 | return 1; | |
4797 | ||
8d08fdba MS |
4798 | default: |
4799 | return 1; | |
4800 | } | |
4801 | } | |
4802 | \f | |
4803 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
4804 | ||
4805 | tree | |
4806 | build_x_conditional_expr (ifexp, op1, op2) | |
4807 | tree ifexp, op1, op2; | |
4808 | { | |
4809 | tree rval = NULL_TREE; | |
4810 | ||
5156628f | 4811 | if (processing_template_decl) |
5566b478 MS |
4812 | return build_min_nt (COND_EXPR, ifexp, op1, op2); |
4813 | ||
c73964b2 MS |
4814 | if (flag_ansi_overloading) |
4815 | return build_new_op (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); | |
4816 | ||
8d08fdba MS |
4817 | /* See comments in `build_x_binary_op'. */ |
4818 | if (op1 != 0) | |
4819 | rval = build_opfncall (COND_EXPR, LOOKUP_SPECULATIVELY, ifexp, op1, op2); | |
4820 | if (rval) | |
4821 | return build_opfncall (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); | |
4822 | ||
4823 | return build_conditional_expr (ifexp, op1, op2); | |
4824 | } | |
4825 | ||
4826 | tree | |
4827 | build_conditional_expr (ifexp, op1, op2) | |
4828 | tree ifexp, op1, op2; | |
4829 | { | |
4830 | register tree type1; | |
4831 | register tree type2; | |
4832 | register enum tree_code code1; | |
4833 | register enum tree_code code2; | |
4834 | register tree result_type = NULL_TREE; | |
8d08fdba MS |
4835 | |
4836 | /* If second operand is omitted, it is the same as the first one; | |
4837 | make sure it is calculated only once. */ | |
4838 | if (op1 == 0) | |
4839 | { | |
4840 | if (pedantic) | |
4841 | pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression"); | |
4842 | ifexp = op1 = save_expr (ifexp); | |
4843 | } | |
4844 | ||
37c46b43 | 4845 | ifexp = cp_convert (boolean_type_node, ifexp); |
8d08fdba MS |
4846 | |
4847 | if (TREE_CODE (ifexp) == ERROR_MARK) | |
4848 | return error_mark_node; | |
4849 | ||
4850 | op1 = require_instantiated_type (TREE_TYPE (op2), op1, error_mark_node); | |
4851 | if (op1 == error_mark_node) | |
4852 | return error_mark_node; | |
4853 | op2 = require_instantiated_type (TREE_TYPE (op1), op2, error_mark_node); | |
4854 | if (op2 == error_mark_node) | |
4855 | return error_mark_node; | |
4856 | ||
4857 | /* C++: REFERENCE_TYPES must be dereferenced. */ | |
4858 | type1 = TREE_TYPE (op1); | |
4859 | code1 = TREE_CODE (type1); | |
4860 | type2 = TREE_TYPE (op2); | |
4861 | code2 = TREE_CODE (type2); | |
4862 | ||
4863 | if (code1 == REFERENCE_TYPE) | |
4864 | { | |
4865 | op1 = convert_from_reference (op1); | |
4866 | type1 = TREE_TYPE (op1); | |
4867 | code1 = TREE_CODE (type1); | |
4868 | } | |
4869 | if (code2 == REFERENCE_TYPE) | |
4870 | { | |
4871 | op2 = convert_from_reference (op2); | |
4872 | type2 = TREE_TYPE (op2); | |
4873 | code2 = TREE_CODE (type2); | |
4874 | } | |
4875 | ||
8d08fdba MS |
4876 | /* Don't promote the operands separately if they promote |
4877 | the same way. Return the unpromoted type and let the combined | |
4878 | value get promoted if necessary. */ | |
4879 | ||
4880 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2) | |
4881 | && code2 != ARRAY_TYPE | |
8d08fdba MS |
4882 | && code2 != FUNCTION_TYPE |
4883 | && code2 != METHOD_TYPE) | |
4884 | { | |
4885 | tree result; | |
4886 | ||
4887 | if (TREE_CONSTANT (ifexp) | |
4888 | && (TREE_CODE (ifexp) == INTEGER_CST | |
4889 | || TREE_CODE (ifexp) == ADDR_EXPR)) | |
4890 | return (integer_zerop (ifexp) ? op2 : op1); | |
4891 | ||
4892 | if (TREE_CODE (op1) == CONST_DECL) | |
4893 | op1 = DECL_INITIAL (op1); | |
4894 | else if (TREE_READONLY_DECL_P (op1)) | |
4895 | op1 = decl_constant_value (op1); | |
4896 | if (TREE_CODE (op2) == CONST_DECL) | |
4897 | op2 = DECL_INITIAL (op2); | |
4898 | else if (TREE_READONLY_DECL_P (op2)) | |
4899 | op2 = decl_constant_value (op2); | |
4900 | if (type1 != type2) | |
f376e137 | 4901 | type1 = cp_build_type_variant |
8d08fdba MS |
4902 | (type1, |
4903 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4904 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4905 | /* ??? This is a kludge to deal with the fact that | |
4906 | we don't sort out integers and enums properly, yet. */ | |
4907 | result = fold (build (COND_EXPR, type1, ifexp, op1, op2)); | |
4908 | if (TREE_TYPE (result) != type1) | |
4909 | result = build1 (NOP_EXPR, type1, result); | |
c73964b2 MS |
4910 | /* Expand both sides into the same slot, |
4911 | hopefully the target of the ?: expression. */ | |
4912 | if (TREE_CODE (op1) == TARGET_EXPR && TREE_CODE (op2) == TARGET_EXPR) | |
4913 | { | |
4914 | tree slot = build (VAR_DECL, TREE_TYPE (result)); | |
4915 | layout_decl (slot, 0); | |
4916 | result = build (TARGET_EXPR, TREE_TYPE (result), | |
4917 | slot, result, NULL_TREE, NULL_TREE); | |
4918 | } | |
8d08fdba MS |
4919 | return result; |
4920 | } | |
8d08fdba MS |
4921 | |
4922 | /* They don't match; promote them both and then try to reconcile them. | |
4923 | But don't permit mismatching enum types. */ | |
4924 | if (code1 == ENUMERAL_TYPE) | |
4925 | { | |
4926 | if (code2 == ENUMERAL_TYPE) | |
4927 | { | |
71851aaa | 4928 | cp_error ("enumeral mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
4929 | return error_mark_node; |
4930 | } | |
b19b4a78 MS |
4931 | else if (extra_warnings && ! IS_AGGR_TYPE_CODE (code2) |
4932 | && type2 != type_promotes_to (type1)) | |
8d08fdba MS |
4933 | warning ("enumeral and non-enumeral type in conditional expression"); |
4934 | } | |
4935 | else if (extra_warnings | |
b19b4a78 MS |
4936 | && code2 == ENUMERAL_TYPE && ! IS_AGGR_TYPE_CODE (code1) |
4937 | && type1 != type_promotes_to (type2)) | |
8d08fdba MS |
4938 | warning ("enumeral and non-enumeral type in conditional expression"); |
4939 | ||
4940 | if (code1 != VOID_TYPE) | |
4941 | { | |
4942 | op1 = default_conversion (op1); | |
4943 | type1 = TREE_TYPE (op1); | |
71851aaa MS |
4944 | if (TYPE_PTRMEMFUNC_P (type1)) |
4945 | type1 = TYPE_PTRMEMFUNC_FN_TYPE (type1); | |
8d08fdba MS |
4946 | code1 = TREE_CODE (type1); |
4947 | } | |
4948 | if (code2 != VOID_TYPE) | |
4949 | { | |
4950 | op2 = default_conversion (op2); | |
4951 | type2 = TREE_TYPE (op2); | |
71851aaa MS |
4952 | if (TYPE_PTRMEMFUNC_P (type2)) |
4953 | type2 = TYPE_PTRMEMFUNC_FN_TYPE (type2); | |
8d08fdba MS |
4954 | code2 = TREE_CODE (type2); |
4955 | } | |
4956 | ||
a5894242 MS |
4957 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE |
4958 | && real_lvalue_p (op1) && real_lvalue_p (op2) | |
4959 | && comptypes (type1, type2, -1)) | |
4960 | { | |
4961 | type1 = build_reference_type (type1); | |
4962 | type2 = build_reference_type (type2); | |
4963 | result_type = common_type (type1, type2); | |
4964 | op1 = convert_to_reference (result_type, op1, CONV_IMPLICIT, | |
4965 | LOOKUP_NORMAL, NULL_TREE); | |
4966 | op2 = convert_to_reference (result_type, op2, CONV_IMPLICIT, | |
4967 | LOOKUP_NORMAL, NULL_TREE); | |
4968 | } | |
8d08fdba MS |
4969 | /* Quickly detect the usual case where op1 and op2 have the same type |
4970 | after promotion. */ | |
a5894242 | 4971 | else if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
8d08fdba MS |
4972 | { |
4973 | if (type1 == type2) | |
4974 | result_type = type1; | |
4975 | else | |
f376e137 | 4976 | result_type = cp_build_type_variant |
8d08fdba MS |
4977 | (type1, |
4978 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4979 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4980 | } | |
4981 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) | |
4982 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
4983 | { | |
4984 | result_type = common_type (type1, type2); | |
4985 | } | |
4986 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
4987 | { | |
4988 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
4989 | pedwarn ("ANSI C++ forbids conditional expr with only one void side"); | |
4990 | result_type = void_type_node; | |
4991 | } | |
d11ad92e MS |
4992 | else if (code1 == POINTER_TYPE && null_ptr_cst_p (op2)) |
4993 | result_type = qualify_type (type1, type2); | |
4994 | else if (code2 == POINTER_TYPE && null_ptr_cst_p (op1)) | |
4995 | result_type = qualify_type (type2, type1); | |
8d08fdba MS |
4996 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) |
4997 | { | |
4998 | if (comp_target_types (type1, type2, 1)) | |
4999 | result_type = common_type (type1, type2); | |
8d08fdba MS |
5000 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) |
5001 | { | |
5002 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
5003 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
5004 | result_type = qualify_type (type1, type2); | |
5005 | } | |
5006 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
5007 | { | |
5008 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
5009 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
5010 | result_type = qualify_type (type2, type1); | |
5011 | } | |
5012 | /* C++ */ | |
5013 | else if (comptypes (type2, type1, 0)) | |
5014 | result_type = type2; | |
5015 | else if (IS_AGGR_TYPE (TREE_TYPE (type1)) | |
5016 | && IS_AGGR_TYPE (TREE_TYPE (type2)) | |
5017 | && (result_type = common_base_type (TREE_TYPE (type1), TREE_TYPE (type2)))) | |
5018 | { | |
5019 | if (result_type == error_mark_node) | |
5020 | { | |
00595019 MS |
5021 | cp_error ("common base type of types `%T' and `%T' is ambiguous", |
5022 | TREE_TYPE (type1), TREE_TYPE (type2)); | |
8d08fdba MS |
5023 | result_type = ptr_type_node; |
5024 | } | |
00595019 MS |
5025 | else |
5026 | { | |
5027 | if (pedantic | |
5028 | && result_type != TREE_TYPE (type1) | |
5029 | && result_type != TREE_TYPE (type2)) | |
5030 | cp_pedwarn ("`%T' and `%T' converted to `%T *' in conditional expression", | |
5031 | type1, type2, result_type); | |
5032 | ||
f30432d7 | 5033 | result_type = build_pointer_type (result_type); |
00595019 | 5034 | } |
8d08fdba MS |
5035 | } |
5036 | else | |
5037 | { | |
5038 | pedwarn ("pointer type mismatch in conditional expression"); | |
5039 | result_type = ptr_type_node; | |
5040 | } | |
5041 | } | |
5042 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
5043 | { | |
d11ad92e | 5044 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba MS |
5045 | result_type = type1; |
5046 | } | |
5047 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
5048 | { | |
d11ad92e | 5049 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba | 5050 | result_type = type2; |
8d08fdba MS |
5051 | } |
5052 | ||
5053 | if (!result_type) | |
5054 | { | |
5055 | /* The match does not look good. If either is | |
5056 | an aggregate value, try converting to a scalar type. */ | |
5057 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE) | |
5058 | { | |
71851aaa | 5059 | cp_error ("aggregate mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
5060 | return error_mark_node; |
5061 | } | |
fc378698 MS |
5062 | /* Warning: this code assumes that conversion between cv-variants of |
5063 | a type is done using NOP_EXPRs. */ | |
8d08fdba MS |
5064 | if (code1 == RECORD_TYPE && TYPE_HAS_CONVERSION (type1)) |
5065 | { | |
e92cc029 MS |
5066 | /* There are other types besides pointers and records. */ |
5067 | tree tmp; | |
5068 | if (code2 == POINTER_TYPE) | |
5069 | tmp = build_pointer_type | |
5070 | (build_type_variant (TREE_TYPE (type2), 1, 1)); | |
5071 | else | |
5072 | tmp = type2; | |
fc378698 | 5073 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op1, 0); |
8d08fdba MS |
5074 | if (tmp == NULL_TREE) |
5075 | { | |
fc378698 MS |
5076 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
5077 | type1, type2); | |
8d08fdba MS |
5078 | return error_mark_node; |
5079 | } | |
5080 | if (tmp == error_mark_node) | |
5081 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
5082 | else |
5083 | STRIP_NOPS (tmp); | |
e92cc029 | 5084 | result_type = common_type (type2, TREE_TYPE (tmp)); |
8d08fdba MS |
5085 | op1 = tmp; |
5086 | } | |
5087 | else if (code2 == RECORD_TYPE && TYPE_HAS_CONVERSION (type2)) | |
5088 | { | |
e92cc029 MS |
5089 | tree tmp; |
5090 | if (code1 == POINTER_TYPE) | |
5091 | tmp = build_pointer_type | |
5092 | (build_type_variant (TREE_TYPE (type1), 1, 1)); | |
5093 | else | |
5094 | tmp = type1; | |
5095 | ||
fc378698 | 5096 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op2, 0); |
8d08fdba MS |
5097 | if (tmp == NULL_TREE) |
5098 | { | |
fc378698 MS |
5099 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
5100 | type1, type2); | |
8d08fdba MS |
5101 | return error_mark_node; |
5102 | } | |
5103 | if (tmp == error_mark_node) | |
5104 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
5105 | else |
5106 | STRIP_NOPS (tmp); | |
5107 | result_type = common_type (type1, TREE_TYPE (tmp)); | |
8d08fdba MS |
5108 | op2 = tmp; |
5109 | } | |
5110 | else if (flag_cond_mismatch) | |
5111 | result_type = void_type_node; | |
5112 | else | |
5113 | { | |
5114 | error ("type mismatch in conditional expression"); | |
5115 | return error_mark_node; | |
5116 | } | |
5117 | } | |
5118 | ||
79ff2c6c MS |
5119 | if (TREE_CODE (result_type) == POINTER_TYPE |
5120 | && TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
5121 | result_type = build_ptrmemfunc_type (result_type); | |
5122 | ||
8d08fdba | 5123 | if (result_type != TREE_TYPE (op1)) |
6633d636 MS |
5124 | op1 = convert_for_initialization |
5125 | (NULL_TREE, result_type, op1, LOOKUP_NORMAL, "converting", NULL_TREE, 0); | |
8d08fdba | 5126 | if (result_type != TREE_TYPE (op2)) |
6633d636 MS |
5127 | op2 = convert_for_initialization |
5128 | (NULL_TREE, result_type, op2, LOOKUP_NORMAL, "converting", NULL_TREE, 0); | |
8d08fdba | 5129 | |
8d08fdba MS |
5130 | if (TREE_CONSTANT (ifexp)) |
5131 | return integer_zerop (ifexp) ? op2 : op1; | |
5132 | ||
a5894242 MS |
5133 | return convert_from_reference |
5134 | (fold (build (COND_EXPR, result_type, ifexp, op1, op2))); | |
8d08fdba MS |
5135 | } |
5136 | \f | |
5137 | /* Handle overloading of the ',' operator when needed. Otherwise, | |
5138 | this function just builds an expression list. */ | |
e92cc029 | 5139 | |
8d08fdba MS |
5140 | tree |
5141 | build_x_compound_expr (list) | |
5142 | tree list; | |
5143 | { | |
5144 | tree rest = TREE_CHAIN (list); | |
5145 | tree result; | |
5146 | ||
5156628f | 5147 | if (processing_template_decl) |
5566b478 MS |
5148 | return build_min_nt (COMPOUND_EXPR, list, NULL_TREE); |
5149 | ||
8d08fdba MS |
5150 | if (rest == NULL_TREE) |
5151 | return build_compound_expr (list); | |
5152 | ||
5153 | result = build_opfncall (COMPOUND_EXPR, LOOKUP_NORMAL, | |
5154 | TREE_VALUE (list), TREE_VALUE (rest), NULL_TREE); | |
5155 | if (result) | |
e66d884e | 5156 | return build_x_compound_expr (expr_tree_cons (NULL_TREE, result, TREE_CHAIN (rest))); |
b19b4a78 MS |
5157 | |
5158 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) | |
5159 | { | |
5160 | /* the left-hand operand of a comma expression is like an expression | |
5161 | statement: we should warn if it doesn't have any side-effects, | |
5162 | unless it was explicitly cast to (void). */ | |
5163 | if ((extra_warnings || warn_unused) | |
5164 | && !(TREE_CODE (TREE_VALUE(list)) == CONVERT_EXPR | |
5165 | && TREE_TYPE (TREE_VALUE(list)) == void_type_node)) | |
5166 | warning("left-hand operand of comma expression has no effect"); | |
5167 | } | |
5168 | #if 0 /* this requires a gcc backend patch to export warn_if_unused_value */ | |
5169 | else if (warn_unused) | |
5170 | warn_if_unused_value (TREE_VALUE(list)); | |
5171 | #endif | |
5172 | ||
e66d884e JM |
5173 | return build_compound_expr (expr_tree_cons (NULL_TREE, TREE_VALUE (list), |
5174 | build_expr_list (NULL_TREE, build_x_compound_expr (rest)))); | |
8d08fdba MS |
5175 | } |
5176 | ||
5177 | /* Given a list of expressions, return a compound expression | |
5178 | that performs them all and returns the value of the last of them. */ | |
5179 | ||
5180 | tree | |
5181 | build_compound_expr (list) | |
5182 | tree list; | |
5183 | { | |
5184 | register tree rest; | |
5185 | ||
5186 | if (TREE_READONLY_DECL_P (TREE_VALUE (list))) | |
5187 | TREE_VALUE (list) = decl_constant_value (TREE_VALUE (list)); | |
5188 | ||
5189 | if (TREE_CHAIN (list) == 0) | |
5190 | { | |
5191 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5192 | Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */ | |
5193 | if (TREE_CODE (list) == NOP_EXPR | |
5194 | && TREE_TYPE (list) == TREE_TYPE (TREE_OPERAND (list, 0))) | |
5195 | list = TREE_OPERAND (list, 0); | |
5196 | ||
5197 | /* Convert arrays to pointers. */ | |
5198 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (list))) == ARRAY_TYPE) | |
5199 | return default_conversion (TREE_VALUE (list)); | |
5200 | else | |
5201 | return TREE_VALUE (list); | |
5202 | } | |
5203 | ||
5204 | rest = build_compound_expr (TREE_CHAIN (list)); | |
5205 | ||
b19b4a78 MS |
5206 | /* When pedantic, a compound expression cannot be a constant expression. */ |
5207 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) | |
5208 | return rest; | |
8d08fdba MS |
5209 | |
5210 | return build (COMPOUND_EXPR, TREE_TYPE (rest), | |
5211 | break_out_cleanups (TREE_VALUE (list)), rest); | |
5212 | } | |
5213 | ||
cdf5b885 MS |
5214 | tree |
5215 | build_static_cast (type, expr) | |
a4443a08 MS |
5216 | tree type, expr; |
5217 | { | |
c11b6f21 MS |
5218 | tree intype, binfo; |
5219 | int ok; | |
5220 | ||
5221 | if (type == error_mark_node || expr == error_mark_node) | |
5222 | return error_mark_node; | |
5223 | ||
5224 | if (TREE_CODE (expr) == OFFSET_REF) | |
5225 | expr = resolve_offset_ref (expr); | |
5226 | ||
5156628f | 5227 | if (processing_template_decl) |
e92cc029 MS |
5228 | { |
5229 | tree t = build_min (STATIC_CAST_EXPR, type, expr); | |
5230 | return t; | |
5231 | } | |
5232 | ||
c11b6f21 MS |
5233 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
5234 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5235 | if (TREE_CODE (type) != REFERENCE_TYPE | |
5236 | && TREE_CODE (expr) == NOP_EXPR | |
5237 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5238 | expr = TREE_OPERAND (expr, 0); | |
5239 | ||
5240 | if (TREE_CODE (type) == VOID_TYPE) | |
5241 | return build1 (CONVERT_EXPR, type, expr); | |
5242 | ||
5243 | if (type_unknown_p (expr)) | |
5244 | { | |
5245 | expr = instantiate_type (type, expr, 1); | |
5246 | if (expr == error_mark_node) | |
5247 | return error_mark_node; | |
5248 | } | |
5249 | ||
5250 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
5251 | return (convert_from_reference | |
5252 | (convert_to_reference (type, expr, CONV_STATIC|CONV_IMPLICIT, | |
5253 | LOOKUP_COMPLAIN, NULL_TREE))); | |
5254 | ||
5255 | if (IS_AGGR_TYPE (type)) | |
5256 | return build_cplus_new | |
5257 | (type, (build_method_call | |
e66d884e | 5258 | (NULL_TREE, ctor_identifier, build_expr_list (NULL_TREE, expr), |
c11b6f21 MS |
5259 | TYPE_BINFO (type), LOOKUP_NORMAL))); |
5260 | ||
5261 | expr = decay_conversion (expr); | |
5262 | intype = TREE_TYPE (expr); | |
5263 | ||
5264 | /* FIXME handle casting to array type. */ | |
5265 | ||
5266 | ok = 0; | |
5267 | if (can_convert_arg (type, intype, expr)) | |
5268 | ok = 1; | |
5269 | else if (TYPE_PTROB_P (type) && TYPE_PTROB_P (intype)) | |
5270 | { | |
5271 | tree binfo; | |
5272 | if (IS_AGGR_TYPE (TREE_TYPE (type)) && IS_AGGR_TYPE (TREE_TYPE (intype)) | |
5273 | && (TYPE_READONLY (TREE_TYPE (type)) | |
5274 | >= TYPE_READONLY (TREE_TYPE (intype))) | |
5275 | && (TYPE_VOLATILE (TREE_TYPE (type)) | |
5276 | >= TYPE_VOLATILE (TREE_TYPE (intype))) | |
5277 | && (binfo = get_binfo (TREE_TYPE (intype), TREE_TYPE (type), 0)) | |
5278 | && ! TREE_VIA_VIRTUAL (binfo)) | |
5279 | ok = 1; | |
5280 | } | |
5281 | else if (TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype)) | |
5282 | { | |
5283 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))), | |
5284 | TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (intype))), 1) | |
5285 | && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (type))) | |
5286 | >= TYPE_READONLY (TREE_TYPE (TREE_TYPE (intype)))) | |
5287 | && (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (type))) | |
5288 | >= TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (intype)))) | |
5289 | && (binfo = get_binfo (TYPE_OFFSET_BASETYPE (intype), | |
5290 | TYPE_OFFSET_BASETYPE (type), 0)) | |
5291 | && ! TREE_VIA_VIRTUAL (binfo)) | |
5292 | ok = 1; | |
5293 | } | |
5294 | else if (TREE_CODE (intype) != BOOLEAN_TYPE | |
5295 | && TREE_CODE (type) != ARRAY_TYPE | |
5296 | && TREE_CODE (type) != FUNCTION_TYPE | |
5297 | && can_convert (intype, type)) | |
5298 | ok = 1; | |
5299 | ||
5300 | if (ok) | |
faf5394a | 5301 | return build_c_cast (type, expr); |
c11b6f21 MS |
5302 | |
5303 | cp_error ("static_cast from `%T' to `%T'", intype, type); | |
5304 | return error_mark_node; | |
a4443a08 MS |
5305 | } |
5306 | ||
cdf5b885 MS |
5307 | tree |
5308 | build_reinterpret_cast (type, expr) | |
a4443a08 MS |
5309 | tree type, expr; |
5310 | { | |
c11b6f21 MS |
5311 | tree intype; |
5312 | ||
5313 | if (type == error_mark_node || expr == error_mark_node) | |
5314 | return error_mark_node; | |
5315 | ||
5316 | if (TREE_CODE (expr) == OFFSET_REF) | |
5317 | expr = resolve_offset_ref (expr); | |
8ccc31eb | 5318 | |
5156628f | 5319 | if (processing_template_decl) |
5566b478 MS |
5320 | { |
5321 | tree t = build_min (REINTERPRET_CAST_EXPR, type, expr); | |
5322 | return t; | |
5323 | } | |
5324 | ||
c11b6f21 MS |
5325 | if (TREE_CODE (type) != REFERENCE_TYPE) |
5326 | { | |
5327 | expr = decay_conversion (expr); | |
5328 | ||
5329 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5330 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5331 | if (TREE_CODE (expr) == NOP_EXPR | |
5332 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5333 | expr = TREE_OPERAND (expr, 0); | |
5334 | } | |
5335 | ||
5336 | if (type_unknown_p (expr)) | |
5337 | { | |
5338 | expr = instantiate_type (type, expr, 1); | |
5339 | if (expr == error_mark_node) | |
5340 | return error_mark_node; | |
5341 | } | |
a80e4195 | 5342 | |
c11b6f21 | 5343 | intype = TREE_TYPE (expr); |
a80e4195 | 5344 | |
c11b6f21 MS |
5345 | if (TREE_CODE (type) == REFERENCE_TYPE) |
5346 | { | |
5347 | if (! real_lvalue_p (expr)) | |
5348 | { | |
5349 | cp_error ("reinterpret_cast from `%T' rvalue to `%T'", intype, type); | |
5350 | return error_mark_node; | |
5351 | } | |
5352 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
5353 | if (expr != error_mark_node) | |
5354 | expr = build_reinterpret_cast | |
5355 | (build_pointer_type (TREE_TYPE (type)), expr); | |
5356 | if (expr != error_mark_node) | |
5357 | expr = build_indirect_ref (expr, 0); | |
5358 | return expr; | |
5359 | } | |
5360 | else if (comptypes (TYPE_MAIN_VARIANT (intype), TYPE_MAIN_VARIANT (type), 1)) | |
5361 | return build_static_cast (type, expr); | |
8ccc31eb | 5362 | |
c11b6f21 MS |
5363 | if (TYPE_PTR_P (type) && (TREE_CODE (intype) == INTEGER_TYPE |
5364 | || TREE_CODE (intype) == ENUMERAL_TYPE)) | |
5365 | /* OK */; | |
5366 | else if (TREE_CODE (type) == INTEGER_TYPE && TYPE_PTR_P (intype)) | |
8ccc31eb | 5367 | { |
c11b6f21 MS |
5368 | if (TYPE_PRECISION (type) < TYPE_PRECISION (intype)) |
5369 | cp_pedwarn ("reinterpret_cast from `%T' to `%T' loses precision", | |
5370 | intype, type); | |
8ccc31eb | 5371 | } |
c11b6f21 MS |
5372 | else if ((TYPE_PTRFN_P (type) && TYPE_PTRFN_P (intype)) |
5373 | || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))) | |
8ccc31eb | 5374 | { |
c11b6f21 MS |
5375 | if (TREE_READONLY_DECL_P (expr)) |
5376 | expr = decl_constant_value (expr); | |
5377 | return fold (build1 (NOP_EXPR, type, expr)); | |
8ccc31eb | 5378 | } |
c11b6f21 MS |
5379 | else if ((TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype)) |
5380 | || (TYPE_PTROBV_P (type) && TYPE_PTROBV_P (intype))) | |
8ccc31eb | 5381 | { |
c11b6f21 MS |
5382 | if (! comp_ptr_ttypes_reinterpret (TREE_TYPE (type), TREE_TYPE (intype))) |
5383 | cp_pedwarn ("reinterpret_cast from `%T' to `%T' casts away const (or volatile)", | |
5384 | intype, type); | |
5385 | ||
5386 | if (TREE_READONLY_DECL_P (expr)) | |
5387 | expr = decl_constant_value (expr); | |
5388 | return fold (build1 (NOP_EXPR, type, expr)); | |
8ccc31eb | 5389 | } |
ffb690bd JM |
5390 | else if ((TYPE_PTRFN_P (type) && TYPE_PTROBV_P (intype)) |
5391 | || (TYPE_PTRFN_P (type) && TYPE_PTROBV_P (intype))) | |
5392 | { | |
5393 | pedwarn ("ANSI C++ forbids casting between pointers to functions and objects"); | |
5394 | if (TREE_READONLY_DECL_P (expr)) | |
5395 | expr = decl_constant_value (expr); | |
5396 | return fold (build1 (NOP_EXPR, type, expr)); | |
5397 | } | |
c11b6f21 | 5398 | else |
8ccc31eb | 5399 | { |
c11b6f21 | 5400 | cp_error ("reinterpret_cast from `%T' to `%T'", intype, type); |
8ccc31eb MS |
5401 | return error_mark_node; |
5402 | } | |
c11b6f21 | 5403 | |
37c46b43 | 5404 | return cp_convert (type, expr); |
a4443a08 MS |
5405 | } |
5406 | ||
cdf5b885 MS |
5407 | tree |
5408 | build_const_cast (type, expr) | |
a4443a08 MS |
5409 | tree type, expr; |
5410 | { | |
c11b6f21 | 5411 | tree intype; |
8ccc31eb | 5412 | |
f30432d7 MS |
5413 | if (type == error_mark_node || expr == error_mark_node) |
5414 | return error_mark_node; | |
5415 | ||
c11b6f21 MS |
5416 | if (TREE_CODE (expr) == OFFSET_REF) |
5417 | expr = resolve_offset_ref (expr); | |
5418 | ||
5156628f | 5419 | if (processing_template_decl) |
e92cc029 MS |
5420 | { |
5421 | tree t = build_min (CONST_CAST_EXPR, type, expr); | |
5422 | return t; | |
5423 | } | |
5424 | ||
c11b6f21 | 5425 | if (TREE_CODE (type) != REFERENCE_TYPE) |
8ccc31eb | 5426 | { |
c11b6f21 MS |
5427 | expr = decay_conversion (expr); |
5428 | ||
5429 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5430 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5431 | if (TREE_CODE (expr) == NOP_EXPR | |
5432 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5433 | expr = TREE_OPERAND (expr, 0); | |
8ccc31eb MS |
5434 | } |
5435 | ||
c11b6f21 | 5436 | if (type_unknown_p (expr)) |
8ccc31eb | 5437 | { |
c11b6f21 MS |
5438 | expr = instantiate_type (type, expr, 1); |
5439 | if (expr == error_mark_node) | |
5440 | return error_mark_node; | |
8ccc31eb | 5441 | } |
8ccc31eb | 5442 | |
c11b6f21 | 5443 | intype = TREE_TYPE (expr); |
8ccc31eb | 5444 | |
c11b6f21 MS |
5445 | if (comptypes (TYPE_MAIN_VARIANT (intype), TYPE_MAIN_VARIANT (type), 1)) |
5446 | return build_static_cast (type, expr); | |
5447 | else if (TREE_CODE (type) == REFERENCE_TYPE) | |
8ccc31eb | 5448 | { |
c11b6f21 | 5449 | if (! real_lvalue_p (expr)) |
8ccc31eb | 5450 | { |
c11b6f21 | 5451 | cp_error ("const_cast from `%T' rvalue to `%T'", intype, type); |
8ccc31eb MS |
5452 | return error_mark_node; |
5453 | } | |
8ccc31eb | 5454 | |
c11b6f21 MS |
5455 | if (comp_ptr_ttypes_const (TREE_TYPE (type), intype)) |
5456 | return (convert_from_reference | |
5457 | (convert_to_reference (type, expr, CONV_CONST|CONV_IMPLICIT, | |
5458 | LOOKUP_COMPLAIN, NULL_TREE))); | |
8ccc31eb | 5459 | } |
c11b6f21 MS |
5460 | else if (TREE_CODE (type) == POINTER_TYPE |
5461 | && TREE_CODE (intype) == POINTER_TYPE | |
5462 | && comp_ptr_ttypes_const (TREE_TYPE (type), TREE_TYPE (intype))) | |
37c46b43 | 5463 | return cp_convert (type, expr); |
8ccc31eb | 5464 | |
c11b6f21 MS |
5465 | cp_error ("const_cast from `%T' to `%T'", intype, type); |
5466 | return error_mark_node; | |
a4443a08 MS |
5467 | } |
5468 | ||
6060a796 MS |
5469 | /* Build an expression representing a cast to type TYPE of expression EXPR. |
5470 | ||
5471 | ALLOW_NONCONVERTING is true if we should allow non-converting constructors | |
5472 | when doing the cast. */ | |
8d08fdba MS |
5473 | |
5474 | tree | |
faf5394a | 5475 | build_c_cast (type, expr) |
bd6dd845 | 5476 | tree type, expr; |
8d08fdba MS |
5477 | { |
5478 | register tree value = expr; | |
5479 | ||
5480 | if (type == error_mark_node || expr == error_mark_node) | |
5481 | return error_mark_node; | |
5482 | ||
5483 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
8ccc31eb MS |
5484 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
5485 | if (TREE_CODE (type) != REFERENCE_TYPE | |
5486 | && TREE_CODE (value) == NOP_EXPR | |
8d08fdba MS |
5487 | && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) |
5488 | value = TREE_OPERAND (value, 0); | |
5489 | ||
5490 | if (TREE_TYPE (expr) | |
5491 | && TREE_CODE (TREE_TYPE (expr)) == OFFSET_TYPE | |
5492 | && TREE_CODE (type) != OFFSET_TYPE) | |
5493 | value = resolve_offset_ref (value); | |
5494 | ||
5495 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5496 | { | |
5497 | /* Allow casting from T1* to T2[] because Cfront allows it. | |
5498 | NIHCL uses it. It is not valid ANSI C however, and hence, not | |
5499 | valid ANSI C++. */ | |
5500 | if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) | |
5501 | { | |
5502 | if (pedantic) | |
5503 | pedwarn ("ANSI C++ forbids casting to an array type"); | |
5504 | type = build_pointer_type (TREE_TYPE (type)); | |
5505 | } | |
5506 | else | |
5507 | { | |
5508 | error ("ANSI C++ forbids casting to an array type"); | |
5509 | return error_mark_node; | |
5510 | } | |
5511 | } | |
5512 | ||
a0a33927 MS |
5513 | if (TREE_CODE (type) == FUNCTION_TYPE |
5514 | || TREE_CODE (type) == METHOD_TYPE) | |
5515 | { | |
5516 | cp_error ("casting to function type `%T'", type); | |
5517 | return error_mark_node; | |
5518 | } | |
5519 | ||
8d08fdba MS |
5520 | if (IS_SIGNATURE (type)) |
5521 | { | |
5522 | error ("cast specifies signature type"); | |
5523 | return error_mark_node; | |
5524 | } | |
5525 | ||
5156628f | 5526 | if (processing_template_decl) |
5566b478 MS |
5527 | { |
5528 | tree t = build_min (CAST_EXPR, type, | |
5529 | min_tree_cons (NULL_TREE, value, NULL_TREE)); | |
5530 | return t; | |
5531 | } | |
5532 | ||
39211cd5 | 5533 | if (TREE_CODE (type) == VOID_TYPE) |
a292b002 | 5534 | value = build1 (CONVERT_EXPR, type, value); |
39211cd5 | 5535 | else if (TREE_TYPE (value) == NULL_TREE |
8d08fdba MS |
5536 | || type_unknown_p (value)) |
5537 | { | |
5538 | value = instantiate_type (type, value, 1); | |
5539 | /* Did we lose? */ | |
5540 | if (value == error_mark_node) | |
5541 | return error_mark_node; | |
5542 | } | |
5543 | else | |
5544 | { | |
8ccc31eb | 5545 | tree otype; |
8d08fdba MS |
5546 | |
5547 | /* Convert functions and arrays to pointers and | |
5548 | convert references to their expanded types, | |
5549 | but don't convert any other types. */ | |
5550 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
f49422da MS |
5551 | || (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE |
5552 | /* Don't do the default conversion if we want a | |
5553 | pointer to a function. */ | |
013bc8af MS |
5554 | && ! (TREE_CODE (type) == POINTER_TYPE |
5555 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)) | |
8d08fdba MS |
5556 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE |
5557 | || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE) | |
5558 | value = default_conversion (value); | |
5559 | otype = TREE_TYPE (value); | |
5560 | ||
5561 | /* Optionally warn about potentially worrisome casts. */ | |
5562 | ||
5563 | if (warn_cast_qual | |
5564 | && TREE_CODE (type) == POINTER_TYPE | |
5565 | && TREE_CODE (otype) == POINTER_TYPE) | |
5566 | { | |
5567 | /* For C++ we make these regular warnings, rather than | |
5568 | softening them into pedwarns. */ | |
5569 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
5570 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
5571 | warning ("cast discards `volatile' from pointer target type"); | |
5572 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
5573 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
5574 | warning ("cast discards `const' from pointer target type"); | |
5575 | } | |
5576 | ||
5577 | /* Warn about possible alignment problems. */ | |
5578 | if (STRICT_ALIGNMENT && warn_cast_align | |
5579 | && TREE_CODE (type) == POINTER_TYPE | |
5580 | && TREE_CODE (otype) == POINTER_TYPE | |
5581 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
5582 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
5583 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
5584 | warning ("cast increases required alignment of target type"); | |
5585 | ||
5586 | #if 0 | |
9e9ff709 MS |
5587 | /* We should see about re-enabling these, they seem useful to |
5588 | me. */ | |
8d08fdba MS |
5589 | if (TREE_CODE (type) == INTEGER_TYPE |
5590 | && TREE_CODE (otype) == POINTER_TYPE | |
5591 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) | |
5592 | warning ("cast from pointer to integer of different size"); | |
5593 | ||
5594 | if (TREE_CODE (type) == POINTER_TYPE | |
5595 | && TREE_CODE (otype) == INTEGER_TYPE | |
5596 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
5597 | /* Don't warn about converting 0 to pointer, | |
5598 | provided the 0 was explicit--not cast or made by folding. */ | |
5599 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))) | |
5600 | warning ("cast to pointer from integer of different size"); | |
5601 | #endif | |
5602 | ||
8ccc31eb MS |
5603 | if (TREE_CODE (type) == REFERENCE_TYPE) |
5604 | value = (convert_from_reference | |
faf5394a | 5605 | (convert_to_reference (type, value, CONV_C_CAST, |
8ccc31eb MS |
5606 | LOOKUP_COMPLAIN, NULL_TREE))); |
5607 | else | |
8d08fdba | 5608 | { |
8ccc31eb MS |
5609 | tree ovalue; |
5610 | ||
5611 | if (TREE_READONLY_DECL_P (value)) | |
5612 | value = decl_constant_value (value); | |
5613 | ||
5614 | ovalue = value; | |
bd6dd845 | 5615 | value = convert_force (type, value, CONV_C_CAST); |
8ccc31eb MS |
5616 | |
5617 | /* Ignore any integer overflow caused by the cast. */ | |
5618 | if (TREE_CODE (value) == INTEGER_CST) | |
5619 | { | |
5620 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
5621 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
5622 | } | |
8d08fdba MS |
5623 | } |
5624 | } | |
5625 | ||
5626 | /* Always produce some operator for an explicit cast, | |
c11b6f21 MS |
5627 | so we can tell (for -pedantic) that the cast is no lvalue. */ |
5628 | if (TREE_CODE (type) != REFERENCE_TYPE && value == expr | |
5629 | && real_lvalue_p (value)) | |
8ccc31eb | 5630 | value = non_lvalue (value); |
8d08fdba MS |
5631 | |
5632 | return value; | |
5633 | } | |
5634 | \f | |
bdcaf773 | 5635 | static tree |
e8abc66f MS |
5636 | expand_target_expr (t) |
5637 | tree t; | |
5638 | { | |
72b7eeff MS |
5639 | extern int temp_slot_level; |
5640 | extern int target_temp_slot_level; | |
5641 | int old_temp_level = target_temp_slot_level; | |
5642 | ||
e8abc66f MS |
5643 | tree xval = make_node (RTL_EXPR); |
5644 | rtx rtxval; | |
5645 | ||
72b7eeff MS |
5646 | /* Any TARGET_EXPR temps live only as long as the outer temp level. |
5647 | Since they are preserved in this new inner level, we know they | |
5648 | will make it into the outer level. */ | |
5649 | push_temp_slots (); | |
5650 | target_temp_slot_level = temp_slot_level; | |
5651 | ||
e8abc66f MS |
5652 | do_pending_stack_adjust (); |
5653 | start_sequence_for_rtl_expr (xval); | |
5654 | emit_note (0, -1); | |
9f617717 | 5655 | rtxval = expand_expr (t, NULL_RTX, VOIDmode, EXPAND_NORMAL); |
e8abc66f MS |
5656 | do_pending_stack_adjust (); |
5657 | TREE_SIDE_EFFECTS (xval) = 1; | |
5658 | RTL_EXPR_SEQUENCE (xval) = get_insns (); | |
5659 | end_sequence (); | |
5660 | RTL_EXPR_RTL (xval) = rtxval; | |
5661 | TREE_TYPE (xval) = TREE_TYPE (t); | |
72b7eeff MS |
5662 | |
5663 | pop_temp_slots (); | |
5664 | target_temp_slot_level = old_temp_level; | |
5665 | ||
e8abc66f MS |
5666 | return xval; |
5667 | } | |
5668 | ||
8d08fdba MS |
5669 | /* Build an assignment expression of lvalue LHS from value RHS. |
5670 | MODIFYCODE is the code for a binary operator that we use | |
5671 | to combine the old value of LHS with RHS to get the new value. | |
5672 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. | |
5673 | ||
e92cc029 MS |
5674 | C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */ |
5675 | ||
8d08fdba MS |
5676 | tree |
5677 | build_modify_expr (lhs, modifycode, rhs) | |
5678 | tree lhs; | |
5679 | enum tree_code modifycode; | |
5680 | tree rhs; | |
5681 | { | |
5682 | register tree result; | |
5683 | tree newrhs = rhs; | |
5684 | tree lhstype = TREE_TYPE (lhs); | |
5685 | tree olhstype = lhstype; | |
a3203465 | 5686 | tree olhs = lhs; |
8d08fdba | 5687 | |
8d08fdba | 5688 | /* Avoid duplicate error messages from operands that had errors. */ |
bd6dd845 | 5689 | if (lhs == error_mark_node || rhs == error_mark_node) |
8d08fdba MS |
5690 | return error_mark_node; |
5691 | ||
f376e137 MS |
5692 | /* Types that aren't fully specified cannot be used in assignments. */ |
5693 | lhs = require_complete_type (lhs); | |
5694 | ||
8d08fdba MS |
5695 | newrhs = rhs; |
5696 | ||
5697 | /* Handle assignment to signature pointers/refs. */ | |
5698 | ||
beb53fb8 JM |
5699 | if (TYPE_LANG_SPECIFIC (lhstype) |
5700 | && (IS_SIGNATURE_POINTER (lhstype) || IS_SIGNATURE_REFERENCE (lhstype))) | |
8d08fdba MS |
5701 | { |
5702 | return build_signature_pointer_constructor (lhs, rhs); | |
5703 | } | |
5704 | ||
5705 | /* Handle control structure constructs used as "lvalues". */ | |
5706 | ||
5707 | switch (TREE_CODE (lhs)) | |
5708 | { | |
5709 | /* Handle --foo = 5; as these are valid constructs in C++ */ | |
5710 | case PREDECREMENT_EXPR: | |
5711 | case PREINCREMENT_EXPR: | |
5712 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) | |
5713 | lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs), | |
46b02c6d MS |
5714 | stabilize_reference (TREE_OPERAND (lhs, 0)), |
5715 | TREE_OPERAND (lhs, 1)); | |
8d08fdba MS |
5716 | return build (COMPOUND_EXPR, lhstype, |
5717 | lhs, | |
5718 | build_modify_expr (TREE_OPERAND (lhs, 0), | |
5719 | modifycode, rhs)); | |
5720 | ||
5721 | /* Handle (a, b) used as an "lvalue". */ | |
5722 | case COMPOUND_EXPR: | |
8d08fdba MS |
5723 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), |
5724 | modifycode, rhs); | |
bd6dd845 | 5725 | if (newrhs == error_mark_node) |
8d08fdba MS |
5726 | return error_mark_node; |
5727 | return build (COMPOUND_EXPR, lhstype, | |
5728 | TREE_OPERAND (lhs, 0), newrhs); | |
5729 | ||
a4443a08 MS |
5730 | case MODIFY_EXPR: |
5731 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs); | |
bd6dd845 | 5732 | if (newrhs == error_mark_node) |
a4443a08 MS |
5733 | return error_mark_node; |
5734 | return build (COMPOUND_EXPR, lhstype, lhs, newrhs); | |
5735 | ||
8d08fdba MS |
5736 | /* Handle (a ? b : c) used as an "lvalue". */ |
5737 | case COND_EXPR: | |
8d08fdba MS |
5738 | rhs = save_expr (rhs); |
5739 | { | |
5740 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
5741 | except that the RHS goes through a save-expr | |
5742 | so the code to compute it is only emitted once. */ | |
5743 | tree cond | |
5744 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
37c46b43 | 5745 | build_modify_expr (cp_convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 1)), |
8d08fdba | 5746 | modifycode, rhs), |
37c46b43 | 5747 | build_modify_expr (cp_convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 2)), |
8d08fdba | 5748 | modifycode, rhs)); |
bd6dd845 | 5749 | if (cond == error_mark_node) |
8d08fdba MS |
5750 | return cond; |
5751 | /* Make sure the code to compute the rhs comes out | |
5752 | before the split. */ | |
5753 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
5754 | /* Case to void to suppress warning | |
5755 | from warn_if_unused_value. */ | |
37c46b43 | 5756 | cp_convert (void_type_node, rhs), cond); |
8d08fdba MS |
5757 | } |
5758 | } | |
5759 | ||
a0a33927 MS |
5760 | if (TREE_CODE (lhs) == OFFSET_REF) |
5761 | { | |
5762 | if (TREE_OPERAND (lhs, 0) == NULL_TREE) | |
5763 | { | |
5764 | /* Static class member? */ | |
5765 | tree member = TREE_OPERAND (lhs, 1); | |
5766 | if (TREE_CODE (member) == VAR_DECL) | |
5767 | lhs = member; | |
5768 | else | |
5769 | { | |
5770 | compiler_error ("invalid static class member"); | |
5771 | return error_mark_node; | |
5772 | } | |
5773 | } | |
5774 | else | |
5775 | lhs = resolve_offset_ref (lhs); | |
5776 | ||
5777 | olhstype = lhstype = TREE_TYPE (lhs); | |
5778 | } | |
5779 | ||
5780 | if (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5781 | && modifycode != INIT_EXPR) | |
5782 | { | |
5783 | lhs = convert_from_reference (lhs); | |
5784 | olhstype = lhstype = TREE_TYPE (lhs); | |
5785 | } | |
5786 | ||
8d08fdba MS |
5787 | /* If a binary op has been requested, combine the old LHS value with the RHS |
5788 | producing the value we should actually store into the LHS. */ | |
5789 | ||
5790 | if (modifycode == INIT_EXPR) | |
5791 | { | |
db5ae43f MS |
5792 | if (! IS_AGGR_TYPE (lhstype)) |
5793 | /* Do the default thing */; | |
5794 | else if (! TYPE_HAS_CONSTRUCTOR (lhstype)) | |
1743ca29 RK |
5795 | { |
5796 | cp_error ("`%T' has no constructors", lhstype); | |
5797 | return error_mark_node; | |
5798 | } | |
e8abc66f | 5799 | else if (TYPE_HAS_TRIVIAL_INIT_REF (lhstype) |
db5ae43f MS |
5800 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
5801 | /* Do the default thing */; | |
5802 | else | |
8d08fdba | 5803 | { |
fc378698 | 5804 | result = build_method_call (lhs, ctor_identifier, |
e66d884e | 5805 | build_expr_list (NULL_TREE, rhs), |
fc378698 | 5806 | TYPE_BINFO (lhstype), LOOKUP_NORMAL); |
8d08fdba MS |
5807 | if (result == NULL_TREE) |
5808 | return error_mark_node; | |
5809 | return result; | |
5810 | } | |
5811 | } | |
5812 | else if (modifycode == NOP_EXPR) | |
5813 | { | |
8d08fdba | 5814 | /* `operator=' is not an inheritable operator. */ |
db5ae43f MS |
5815 | if (! IS_AGGR_TYPE (lhstype)) |
5816 | /* Do the default thing */; | |
5817 | else if (! TYPE_HAS_ASSIGNMENT (lhstype)) | |
1743ca29 RK |
5818 | { |
5819 | cp_error ("`%T' does not define operator=", lhstype); | |
5820 | return error_mark_node; | |
5821 | } | |
e8abc66f | 5822 | else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (lhstype) |
db5ae43f | 5823 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
a5894242 | 5824 | { |
6467930b MS |
5825 | build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, |
5826 | lhs, rhs, make_node (NOP_EXPR)); | |
a5894242 MS |
5827 | |
5828 | /* Do the default thing */; | |
5829 | } | |
db5ae43f | 5830 | else |
8d08fdba MS |
5831 | { |
5832 | result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, | |
5833 | lhs, rhs, make_node (NOP_EXPR)); | |
5834 | if (result == NULL_TREE) | |
5835 | return error_mark_node; | |
5836 | return result; | |
5837 | } | |
8d08fdba MS |
5838 | lhstype = olhstype; |
5839 | } | |
5840 | else if (PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE)) | |
5841 | { | |
5842 | /* This case must convert to some sort of lvalue that | |
5843 | can participate in an op= operation. */ | |
5844 | tree lhs_tmp = lhs; | |
5845 | tree rhs_tmp = rhs; | |
5846 | if (build_default_binary_type_conversion (modifycode, &lhs_tmp, &rhs_tmp)) | |
5847 | { | |
5848 | lhs = stabilize_reference (lhs_tmp); | |
45537677 | 5849 | /* Forget it was ever anything else. */ |
8d08fdba MS |
5850 | olhstype = lhstype = TREE_TYPE (lhs); |
5851 | newrhs = build_binary_op (modifycode, lhs, rhs_tmp, 1); | |
5852 | } | |
5853 | else | |
b7484fbe | 5854 | { |
c91a56d2 | 5855 | cp_error ("no match for `%Q(%#T, %#T)'", modifycode, |
b7484fbe MS |
5856 | TREE_TYPE (lhs), TREE_TYPE (rhs)); |
5857 | return error_mark_node; | |
5858 | } | |
8d08fdba MS |
5859 | } |
5860 | else | |
5861 | { | |
5862 | lhs = stabilize_reference (lhs); | |
5863 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
c91a56d2 MS |
5864 | if (newrhs == error_mark_node) |
5865 | { | |
5866 | cp_error (" in evaluation of `%Q(%#T, %#T)'", modifycode, | |
5867 | TREE_TYPE (lhs), TREE_TYPE (rhs)); | |
5868 | return error_mark_node; | |
5869 | } | |
8d08fdba MS |
5870 | } |
5871 | ||
5872 | /* Handle a cast used as an "lvalue". | |
5873 | We have already performed any binary operator using the value as cast. | |
5874 | Now convert the result to the cast type of the lhs, | |
5875 | and then true type of the lhs and store it there; | |
5876 | then convert result back to the cast type to be the value | |
5877 | of the assignment. */ | |
5878 | ||
5879 | switch (TREE_CODE (lhs)) | |
5880 | { | |
5881 | case NOP_EXPR: | |
5882 | case CONVERT_EXPR: | |
5883 | case FLOAT_EXPR: | |
5884 | case FIX_TRUNC_EXPR: | |
5885 | case FIX_FLOOR_EXPR: | |
5886 | case FIX_ROUND_EXPR: | |
5887 | case FIX_CEIL_EXPR: | |
5888 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
5889 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE | |
5890 | || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE | |
5891 | || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE) | |
5892 | newrhs = default_conversion (newrhs); | |
5893 | { | |
5894 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
5895 | tree result; | |
2ba25f50 MS |
5896 | |
5897 | /* WP 5.4.1: The result is an lvalue if T is a reference type, | |
5898 | otherwise the result is an rvalue. */ | |
5899 | if (! lvalue_p (lhs)) | |
5900 | pedwarn ("ANSI C++ forbids cast to non-reference type used as lvalue"); | |
a0a33927 | 5901 | |
8d08fdba | 5902 | result = build_modify_expr (inner_lhs, NOP_EXPR, |
37c46b43 MS |
5903 | cp_convert (TREE_TYPE (inner_lhs), |
5904 | cp_convert (lhstype, newrhs))); | |
bd6dd845 | 5905 | if (result == error_mark_node) |
8d08fdba | 5906 | return result; |
37c46b43 | 5907 | return cp_convert (TREE_TYPE (lhs), result); |
8d08fdba MS |
5908 | } |
5909 | } | |
8d08fdba MS |
5910 | |
5911 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
5912 | Reject anything strange now. */ | |
5913 | ||
5914 | if (!lvalue_or_else (lhs, "assignment")) | |
5915 | return error_mark_node; | |
5916 | ||
5917 | GNU_xref_assign (lhs); | |
5918 | ||
5919 | /* Warn about storing in something that is `const'. */ | |
5920 | /* For C++, don't warn if this is initialization. */ | |
5921 | if (modifycode != INIT_EXPR | |
5922 | /* For assignment to `const' signature pointer/reference fields, | |
5923 | don't warn either, we already printed a better message before. */ | |
5924 | && ! (TREE_CODE (lhs) == COMPONENT_REF | |
5925 | && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs, 0))) | |
5926 | || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs, 0))))) | |
5927 | && (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
5928 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
5929 | || TREE_CODE (lhstype) == UNION_TYPE) | |
5930 | && C_TYPE_FIELDS_READONLY (lhstype)) | |
5931 | || (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5932 | && TYPE_READONLY (TREE_TYPE (lhstype))))) | |
5933 | readonly_error (lhs, "assignment", 0); | |
5934 | ||
5935 | /* If storing into a structure or union member, | |
5936 | it has probably been given type `int'. | |
5937 | Compute the type that would go with | |
5938 | the actual amount of storage the member occupies. */ | |
5939 | ||
5940 | if (TREE_CODE (lhs) == COMPONENT_REF | |
5941 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
5942 | || TREE_CODE (lhstype) == REAL_TYPE | |
5943 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
a0a33927 MS |
5944 | { |
5945 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
5946 | ||
5947 | /* If storing in a field that is in actuality a short or narrower | |
5948 | than one, we must store in the field in its actual type. */ | |
5949 | ||
5950 | if (lhstype != TREE_TYPE (lhs)) | |
5951 | { | |
5952 | lhs = copy_node (lhs); | |
5953 | TREE_TYPE (lhs) = lhstype; | |
5954 | } | |
5955 | } | |
8d08fdba MS |
5956 | |
5957 | /* check to see if there is an assignment to `this' */ | |
4ac14744 | 5958 | if (lhs == current_class_ptr) |
8d08fdba | 5959 | { |
2986ae00 MS |
5960 | if (flag_this_is_variable > 0 |
5961 | && DECL_NAME (current_function_decl) != NULL_TREE | |
8ccc31eb MS |
5962 | && (DECL_NAME (current_function_decl) |
5963 | != constructor_name (current_class_type))) | |
2986ae00 | 5964 | warning ("assignment to `this' not in constructor or destructor"); |
8d08fdba MS |
5965 | current_function_just_assigned_this = 1; |
5966 | } | |
5967 | ||
5968 | /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen | |
5969 | when the type of RHS is not yet known, i.e. its type | |
5970 | is inherited from LHS. */ | |
5971 | rhs = require_instantiated_type (lhstype, newrhs, error_mark_node); | |
5972 | if (rhs == error_mark_node) | |
5973 | return error_mark_node; | |
5974 | newrhs = rhs; | |
5975 | ||
5976 | if (modifycode != INIT_EXPR) | |
5977 | { | |
5978 | /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */ | |
5979 | modifycode = NOP_EXPR; | |
5980 | /* Reference-bashing */ | |
5981 | if (TREE_CODE (lhstype) == REFERENCE_TYPE) | |
5982 | { | |
5983 | tree tmp = convert_from_reference (lhs); | |
5984 | lhstype = TREE_TYPE (tmp); | |
5985 | if (TYPE_SIZE (lhstype) == 0) | |
5986 | { | |
5987 | incomplete_type_error (lhs, lhstype); | |
5988 | return error_mark_node; | |
5989 | } | |
5990 | lhs = tmp; | |
5991 | olhstype = lhstype; | |
5992 | } | |
5993 | if (TREE_CODE (TREE_TYPE (newrhs)) == REFERENCE_TYPE) | |
5994 | { | |
5995 | tree tmp = convert_from_reference (newrhs); | |
5996 | if (TYPE_SIZE (TREE_TYPE (tmp)) == 0) | |
5997 | { | |
5998 | incomplete_type_error (newrhs, TREE_TYPE (tmp)); | |
5999 | return error_mark_node; | |
6000 | } | |
6001 | newrhs = tmp; | |
6002 | } | |
6003 | } | |
6004 | ||
6005 | if (TREE_SIDE_EFFECTS (lhs)) | |
6006 | lhs = stabilize_reference (lhs); | |
6007 | if (TREE_SIDE_EFFECTS (newrhs)) | |
6008 | newrhs = stabilize_reference (newrhs); | |
6009 | ||
8d08fdba MS |
6010 | /* Convert new value to destination type. */ |
6011 | ||
6012 | if (TREE_CODE (lhstype) == ARRAY_TYPE) | |
6013 | { | |
f376e137 MS |
6014 | int from_array; |
6015 | ||
44a8d0b3 MS |
6016 | if (! comptypes (lhstype, TREE_TYPE (rhs), 0)) |
6017 | { | |
6018 | cp_error ("incompatible types in assignment of `%T' to `%T'", | |
6019 | TREE_TYPE (rhs), lhstype); | |
6020 | return error_mark_node; | |
6021 | } | |
6022 | ||
39211cd5 | 6023 | /* Allow array assignment in compiler-generated code. */ |
e1cd6e56 | 6024 | if (pedantic && ! DECL_ARTIFICIAL (current_function_decl)) |
f376e137 | 6025 | pedwarn ("ANSI C++ forbids assignment of arrays"); |
39211cd5 | 6026 | |
8d08fdba MS |
6027 | /* Have to wrap this in RTL_EXPR for two cases: |
6028 | in base or member initialization and if we | |
6029 | are a branch of a ?: operator. Since we | |
6030 | can't easily know the latter, just do it always. */ | |
6031 | ||
6032 | result = make_node (RTL_EXPR); | |
6033 | ||
6034 | TREE_TYPE (result) = void_type_node; | |
6035 | do_pending_stack_adjust (); | |
6036 | start_sequence_for_rtl_expr (result); | |
6037 | ||
6038 | /* As a matter of principle, `start_sequence' should do this. */ | |
6039 | emit_note (0, -1); | |
6040 | ||
f376e137 MS |
6041 | from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE |
6042 | ? 1 + (modifycode != INIT_EXPR): 0; | |
8d08fdba | 6043 | expand_vec_init (lhs, lhs, array_type_nelts (lhstype), newrhs, |
f376e137 | 6044 | from_array); |
8d08fdba MS |
6045 | |
6046 | do_pending_stack_adjust (); | |
6047 | ||
6048 | TREE_SIDE_EFFECTS (result) = 1; | |
6049 | RTL_EXPR_SEQUENCE (result) = get_insns (); | |
6050 | RTL_EXPR_RTL (result) = const0_rtx; | |
6051 | end_sequence (); | |
6052 | return result; | |
6053 | } | |
6054 | ||
6055 | if (modifycode == INIT_EXPR) | |
6056 | { | |
6057 | newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL, | |
6058 | "assignment", NULL_TREE, 0); | |
6059 | if (lhs == DECL_RESULT (current_function_decl)) | |
6060 | { | |
6061 | if (DECL_INITIAL (lhs)) | |
6062 | warning ("return value from function receives multiple initializations"); | |
6063 | DECL_INITIAL (lhs) = newrhs; | |
6064 | } | |
6065 | } | |
6066 | else | |
6067 | { | |
e92cc029 | 6068 | /* Avoid warnings on enum bit fields. */ |
8d08fdba MS |
6069 | if (TREE_CODE (olhstype) == ENUMERAL_TYPE |
6070 | && TREE_CODE (lhstype) == INTEGER_TYPE) | |
6071 | { | |
6072 | newrhs = convert_for_assignment (olhstype, newrhs, "assignment", | |
6073 | NULL_TREE, 0); | |
6060a796 | 6074 | newrhs = convert_force (lhstype, newrhs, 0); |
8d08fdba MS |
6075 | } |
6076 | else | |
6077 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
b7484fbe MS |
6078 | NULL_TREE, 0); |
6079 | if (TREE_CODE (newrhs) == CALL_EXPR | |
6080 | && TYPE_NEEDS_CONSTRUCTING (lhstype)) | |
5566b478 | 6081 | newrhs = build_cplus_new (lhstype, newrhs); |
b7484fbe | 6082 | |
e8abc66f | 6083 | /* Can't initialize directly from a TARGET_EXPR, since that would |
07674418 MS |
6084 | cause the lhs to be constructed twice, and possibly result in |
6085 | accidental self-initialization. So we force the TARGET_EXPR to be | |
be99da77 | 6086 | expanded without a target. */ |
b7484fbe | 6087 | if (TREE_CODE (newrhs) == TARGET_EXPR) |
be99da77 | 6088 | newrhs = build (COMPOUND_EXPR, TREE_TYPE (newrhs), newrhs, |
a0128b67 | 6089 | TREE_OPERAND (newrhs, 0)); |
8d08fdba MS |
6090 | } |
6091 | ||
bd6dd845 | 6092 | if (newrhs == error_mark_node) |
8d08fdba MS |
6093 | return error_mark_node; |
6094 | ||
6095 | if (TREE_CODE (newrhs) == COND_EXPR) | |
6096 | { | |
6097 | tree lhs1; | |
6098 | tree cond = TREE_OPERAND (newrhs, 0); | |
6099 | ||
6100 | if (TREE_SIDE_EFFECTS (lhs)) | |
6101 | cond = build_compound_expr (tree_cons | |
6102 | (NULL_TREE, lhs, | |
e66d884e | 6103 | build_expr_list (NULL_TREE, cond))); |
8d08fdba MS |
6104 | |
6105 | /* Cannot have two identical lhs on this one tree (result) as preexpand | |
6106 | calls will rip them out and fill in RTL for them, but when the | |
6107 | rtl is generated, the calls will only be in the first side of the | |
6108 | condition, not on both, or before the conditional jump! (mrs) */ | |
6109 | lhs1 = break_out_calls (lhs); | |
6110 | ||
6111 | if (lhs == lhs1) | |
6112 | /* If there's no change, the COND_EXPR behaves like any other rhs. */ | |
6113 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
6114 | lhstype, lhs, newrhs); | |
6115 | else | |
6116 | { | |
6117 | tree result_type = TREE_TYPE (newrhs); | |
6118 | /* We have to convert each arm to the proper type because the | |
6119 | types may have been munged by constant folding. */ | |
6120 | result | |
6121 | = build (COND_EXPR, result_type, cond, | |
6122 | build_modify_expr (lhs, modifycode, | |
37c46b43 MS |
6123 | cp_convert (result_type, |
6124 | TREE_OPERAND (newrhs, 1))), | |
8d08fdba | 6125 | build_modify_expr (lhs1, modifycode, |
37c46b43 MS |
6126 | cp_convert (result_type, |
6127 | TREE_OPERAND (newrhs, 2)))); | |
8d08fdba MS |
6128 | } |
6129 | } | |
8d08fdba MS |
6130 | else |
6131 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
6132 | lhstype, lhs, newrhs); | |
2ee887f2 | 6133 | |
8d08fdba MS |
6134 | TREE_SIDE_EFFECTS (result) = 1; |
6135 | ||
6136 | /* If we got the LHS in a different type for storing in, | |
6137 | convert the result back to the nominal type of LHS | |
6138 | so that the value we return always has the same type | |
6139 | as the LHS argument. */ | |
6140 | ||
6141 | if (olhstype == TREE_TYPE (result)) | |
6142 | return result; | |
6143 | /* Avoid warnings converting integral types back into enums | |
e92cc029 | 6144 | for enum bit fields. */ |
8d08fdba MS |
6145 | if (TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE |
6146 | && TREE_CODE (olhstype) == ENUMERAL_TYPE) | |
a3203465 MS |
6147 | { |
6148 | result = build (COMPOUND_EXPR, olhstype, result, olhs); | |
6149 | TREE_NO_UNUSED_WARNING (result) = 1; | |
6150 | return result; | |
6151 | } | |
8d08fdba MS |
6152 | return convert_for_assignment (olhstype, result, "assignment", |
6153 | NULL_TREE, 0); | |
6154 | } | |
6155 | ||
5566b478 MS |
6156 | tree |
6157 | build_x_modify_expr (lhs, modifycode, rhs) | |
6158 | tree lhs; | |
6159 | enum tree_code modifycode; | |
6160 | tree rhs; | |
6161 | { | |
5156628f | 6162 | if (processing_template_decl) |
5566b478 | 6163 | return build_min_nt (MODOP_EXPR, lhs, |
4dabb379 | 6164 | build_min_nt (modifycode, NULL_TREE, NULL_TREE), rhs); |
5566b478 MS |
6165 | |
6166 | if (modifycode != NOP_EXPR) | |
6167 | { | |
6168 | tree rval = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, | |
6169 | make_node (modifycode)); | |
6170 | if (rval) | |
6171 | return rval; | |
6172 | } | |
6173 | return build_modify_expr (lhs, modifycode, rhs); | |
6174 | } | |
8d08fdba MS |
6175 | |
6176 | /* Return 0 if EXP is not a valid lvalue in this language | |
6177 | even though `lvalue_or_else' would accept it. */ | |
6178 | ||
6179 | int | |
6180 | language_lvalue_valid (exp) | |
6181 | tree exp; | |
6182 | { | |
6183 | return 1; | |
6184 | } | |
6185 | \f | |
ddd5a7c1 | 6186 | /* Get difference in deltas for different pointer to member function |
abc95ed3 | 6187 | types. Return integer_zero_node, if FROM cannot be converted to a |
51c184be | 6188 | TO type. If FORCE is true, then allow reverse conversions as well. */ |
e92cc029 | 6189 | |
51c184be MS |
6190 | static tree |
6191 | get_delta_difference (from, to, force) | |
6192 | tree from, to; | |
8926095f | 6193 | int force; |
51c184be MS |
6194 | { |
6195 | tree delta = integer_zero_node; | |
6196 | tree binfo; | |
6197 | ||
6198 | if (to == from) | |
6199 | return delta; | |
6200 | ||
8926095f MS |
6201 | /* Should get_base_distance here, so we can check if any thing along the |
6202 | path is virtual, and we need to make sure we stay | |
6203 | inside the real binfos when going through virtual bases. | |
6204 | Maybe we should replace virtual bases with | |
6205 | binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */ | |
51c184be MS |
6206 | binfo = get_binfo (from, to, 1); |
6207 | if (binfo == error_mark_node) | |
6208 | { | |
9a3b49ac | 6209 | error (" in pointer to member function conversiona"); |
51c184be MS |
6210 | return delta; |
6211 | } | |
6212 | if (binfo == 0) | |
6213 | { | |
6214 | if (!force) | |
6215 | { | |
6216 | error_not_base_type (from, to); | |
d22c8596 | 6217 | error (" in pointer to member conversion"); |
51c184be MS |
6218 | return delta; |
6219 | } | |
6220 | binfo = get_binfo (to, from, 1); | |
6221 | if (binfo == error_mark_node) | |
6222 | { | |
9a3b49ac MS |
6223 | if (!force) |
6224 | error (" in pointer to member conversion"); | |
51c184be MS |
6225 | return delta; |
6226 | } | |
6227 | if (binfo == 0) | |
6228 | { | |
9a3b49ac MS |
6229 | if (!force) |
6230 | cp_error ("cannot convert pointer to member of type %T to unrelated pointer to member of type %T", from, to); | |
51c184be MS |
6231 | return delta; |
6232 | } | |
6233 | if (TREE_VIA_VIRTUAL (binfo)) | |
6234 | { | |
4ac14744 MS |
6235 | binfo = binfo_member (BINFO_TYPE (binfo), |
6236 | CLASSTYPE_VBASECLASSES (from)); | |
b7484fbe | 6237 | warning ("pointer to member conversion to virtual base class will only work if you are very careful"); |
51c184be | 6238 | } |
4ac14744 | 6239 | delta = BINFO_OFFSET (binfo); |
37c46b43 | 6240 | delta = cp_convert (ptrdiff_type_node, delta); |
4ac14744 | 6241 | |
e1cd6e56 MS |
6242 | return build_binary_op (MINUS_EXPR, |
6243 | integer_zero_node, | |
4ac14744 | 6244 | delta, 1); |
51c184be MS |
6245 | } |
6246 | if (TREE_VIA_VIRTUAL (binfo)) | |
6247 | { | |
b7484fbe | 6248 | warning ("pointer to member conversion from virtual base class will only work if you are very careful"); |
51c184be MS |
6249 | } |
6250 | return BINFO_OFFSET (binfo); | |
6251 | } | |
6252 | ||
594740f3 MS |
6253 | static tree |
6254 | build_ptrmemfunc1 (type, delta, idx, pfn, delta2) | |
6255 | tree type, delta, idx, pfn, delta2; | |
6256 | { | |
6257 | tree u; | |
6258 | ||
6259 | #if 0 | |
6260 | /* This is the old way we did it. We want to avoid calling | |
6261 | digest_init, so that it can give an error if we use { } when | |
6262 | initializing a pointer to member function. */ | |
6263 | ||
6264 | if (pfn) | |
6265 | { | |
6266 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
e66d884e | 6267 | expr_tree_cons (pfn_identifier, pfn, NULL_TREE)); |
594740f3 MS |
6268 | } |
6269 | else | |
6270 | { | |
6271 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
e66d884e | 6272 | expr_tree_cons (delta2_identifier, delta2, NULL_TREE)); |
594740f3 MS |
6273 | } |
6274 | ||
6275 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
e66d884e JM |
6276 | expr_tree_cons (NULL_TREE, delta, |
6277 | expr_tree_cons (NULL_TREE, idx, | |
6278 | expr_tree_cons (NULL_TREE, u, NULL_TREE)))); | |
594740f3 MS |
6279 | |
6280 | return digest_init (type, u, (tree*)0); | |
6281 | #else | |
6282 | tree delta_field, idx_field, pfn_or_delta2_field, pfn_field, delta2_field; | |
6283 | tree subtype; | |
6284 | int allconstant, allsimple; | |
6285 | ||
6286 | delta_field = TYPE_FIELDS (type); | |
6287 | idx_field = TREE_CHAIN (delta_field); | |
6288 | pfn_or_delta2_field = TREE_CHAIN (idx_field); | |
6289 | subtype = TREE_TYPE (pfn_or_delta2_field); | |
6290 | pfn_field = TYPE_FIELDS (subtype); | |
6291 | delta2_field = TREE_CHAIN (pfn_field); | |
6292 | ||
6293 | if (pfn) | |
6294 | { | |
6295 | allconstant = TREE_CONSTANT (pfn); | |
ca79f85d | 6296 | allsimple = !! initializer_constant_valid_p (pfn, TREE_TYPE (pfn)); |
e66d884e | 6297 | u = expr_tree_cons (pfn_field, pfn, NULL_TREE); |
594740f3 MS |
6298 | } |
6299 | else | |
6300 | { | |
6301 | delta2 = convert_and_check (delta_type_node, delta2); | |
6302 | allconstant = TREE_CONSTANT (delta2); | |
ca79f85d | 6303 | allsimple = !! initializer_constant_valid_p (delta2, TREE_TYPE (delta2)); |
e66d884e | 6304 | u = expr_tree_cons (delta2_field, delta2, NULL_TREE); |
594740f3 MS |
6305 | } |
6306 | ||
6307 | delta = convert_and_check (delta_type_node, delta); | |
6308 | idx = convert_and_check (delta_type_node, idx); | |
6309 | ||
6310 | allconstant = allconstant && TREE_CONSTANT (delta) && TREE_CONSTANT (idx); | |
6311 | allsimple = allsimple | |
6312 | && initializer_constant_valid_p (delta, TREE_TYPE (delta)) | |
6313 | && initializer_constant_valid_p (idx, TREE_TYPE (idx)); | |
6314 | ||
6315 | u = build (CONSTRUCTOR, subtype, NULL_TREE, u); | |
e66d884e JM |
6316 | u = expr_tree_cons (delta_field, delta, |
6317 | expr_tree_cons (idx_field, idx, | |
6318 | expr_tree_cons (pfn_or_delta2_field, u, NULL_TREE))); | |
594740f3 MS |
6319 | u = build (CONSTRUCTOR, type, NULL_TREE, u); |
6320 | TREE_CONSTANT (u) = allconstant; | |
6321 | TREE_STATIC (u) = allconstant && allsimple; | |
6322 | return u; | |
6323 | #endif | |
6324 | } | |
6325 | ||
8d08fdba MS |
6326 | /* Build a constructor for a pointer to member function. It can be |
6327 | used to initialize global variables, local variable, or used | |
6328 | as a value in expressions. TYPE is the POINTER to METHOD_TYPE we | |
6329 | want to be. | |
6330 | ||
6331 | If FORCE is non-zero, then force this conversion, even if | |
6332 | we would rather not do it. Usually set when using an explicit | |
51c184be MS |
6333 | cast. |
6334 | ||
6335 | Return error_mark_node, if something goes wrong. */ | |
8d08fdba MS |
6336 | |
6337 | tree | |
6338 | build_ptrmemfunc (type, pfn, force) | |
6339 | tree type, pfn; | |
6340 | int force; | |
6341 | { | |
e92cc029 | 6342 | tree idx = integer_zero_node; |
8d08fdba MS |
6343 | tree delta = integer_zero_node; |
6344 | tree delta2 = integer_zero_node; | |
6345 | tree vfield_offset; | |
594740f3 | 6346 | tree npfn = NULL_TREE; |
8d08fdba | 6347 | |
e92cc029 | 6348 | /* Handle multiple conversions of pointer to member functions. */ |
51c184be | 6349 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn))) |
8d08fdba | 6350 | { |
de22184b | 6351 | tree ndelta, ndelta2; |
594740f3 MS |
6352 | tree e1, e2, e3, n; |
6353 | ||
51c184be | 6354 | /* Is is already the right type? */ |
51c184be MS |
6355 | if (type == TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) |
6356 | return pfn; | |
51c184be | 6357 | |
37c46b43 MS |
6358 | ndelta = cp_convert (ptrdiff_type_node, build_component_ref (pfn, delta_identifier, NULL_TREE, 0)); |
6359 | ndelta2 = cp_convert (ptrdiff_type_node, DELTA2_FROM_PTRMEMFUNC (pfn)); | |
594740f3 MS |
6360 | idx = build_component_ref (pfn, index_identifier, NULL_TREE, 0); |
6361 | ||
6362 | n = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), | |
6363 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6364 | force); | |
6365 | ||
6366 | delta = build_binary_op (PLUS_EXPR, ndelta, n, 1); | |
6367 | delta2 = build_binary_op (PLUS_EXPR, ndelta2, n, 1); | |
6368 | e1 = fold (build (GT_EXPR, boolean_type_node, idx, integer_zero_node)); | |
51c184be | 6369 | |
594740f3 MS |
6370 | e2 = build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, |
6371 | NULL_TREE, delta2); | |
51c184be | 6372 | |
594740f3 MS |
6373 | pfn = PFN_FROM_PTRMEMFUNC (pfn); |
6374 | npfn = build1 (NOP_EXPR, type, pfn); | |
6375 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
51c184be | 6376 | |
594740f3 MS |
6377 | e3 = build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, npfn, |
6378 | NULL_TREE); | |
6379 | return build_conditional_expr (e1, e2, e3); | |
8d08fdba | 6380 | } |
51c184be | 6381 | |
e92cc029 | 6382 | /* Handle null pointer to member function conversions. */ |
51c184be MS |
6383 | if (integer_zerop (pfn)) |
6384 | { | |
faf5394a | 6385 | pfn = build_c_cast (type, integer_zero_node); |
594740f3 MS |
6386 | return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), |
6387 | integer_zero_node, integer_zero_node, | |
6388 | pfn, NULL_TREE); | |
51c184be MS |
6389 | } |
6390 | ||
f376e137 MS |
6391 | if (TREE_CODE (pfn) == TREE_LIST |
6392 | || (TREE_CODE (pfn) == ADDR_EXPR | |
6393 | && TREE_CODE (TREE_OPERAND (pfn, 0)) == TREE_LIST)) | |
c73964b2 | 6394 | return instantiate_type (type, pfn, 1); |
a0a33927 | 6395 | |
e92cc029 | 6396 | /* Allow pointer to member conversions here. */ |
51c184be MS |
6397 | delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn))), |
6398 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6399 | force); | |
e1cd6e56 | 6400 | delta2 = build_binary_op (PLUS_EXPR, delta2, delta, 1); |
8d08fdba | 6401 | |
4ac14744 MS |
6402 | #if 0 |
6403 | /* We need to check the argument types to see if they are compatible | |
6404 | (any const or volatile violations. */ | |
6405 | something like this: | |
6406 | comptype (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (type))), | |
6407 | TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (pfn)))), ?); | |
6408 | #endif | |
6409 | ||
8d08fdba MS |
6410 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) != FUNCTION_DECL) |
6411 | warning ("assuming pointer to member function is non-virtual"); | |
6412 | ||
6413 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) == FUNCTION_DECL | |
6414 | && DECL_VINDEX (TREE_OPERAND (pfn, 0))) | |
6415 | { | |
e92cc029 | 6416 | /* Find the offset to the vfield pointer in the object. */ |
51c184be MS |
6417 | vfield_offset = get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn, 0)), |
6418 | DECL_CLASS_CONTEXT (TREE_OPERAND (pfn, 0)), | |
6419 | 0); | |
6420 | vfield_offset = get_vfield_offset (vfield_offset); | |
8d08fdba MS |
6421 | delta2 = size_binop (PLUS_EXPR, vfield_offset, delta2); |
6422 | ||
6423 | /* Map everything down one to make room for the null pointer to member. */ | |
e92cc029 MS |
6424 | idx = size_binop (PLUS_EXPR, |
6425 | DECL_VINDEX (TREE_OPERAND (pfn, 0)), | |
6426 | integer_one_node); | |
8d08fdba MS |
6427 | } |
6428 | else | |
51c184be | 6429 | { |
e92cc029 | 6430 | idx = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); |
8d08fdba | 6431 | |
4dabb379 MS |
6432 | if (type == TREE_TYPE (pfn)) |
6433 | { | |
6434 | npfn = pfn; | |
6435 | } | |
6436 | else | |
6437 | { | |
6438 | npfn = build1 (NOP_EXPR, type, pfn); | |
6439 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
6440 | } | |
51c184be | 6441 | } |
8d08fdba | 6442 | |
594740f3 | 6443 | return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, npfn, delta2); |
8d08fdba MS |
6444 | } |
6445 | ||
6446 | /* Convert value RHS to type TYPE as preparation for an assignment | |
6447 | to an lvalue of type TYPE. | |
6448 | The real work of conversion is done by `convert'. | |
6449 | The purpose of this function is to generate error messages | |
6450 | for assignments that are not allowed in C. | |
6451 | ERRTYPE is a string to use in error messages: | |
6452 | "assignment", "return", etc. | |
6453 | ||
6454 | C++: attempts to allow `convert' to find conversions involving | |
6455 | implicit type conversion between aggregate and scalar types | |
6456 | as per 8.5.6 of C++ manual. Does not randomly dereference | |
6457 | pointers to aggregates! */ | |
6458 | ||
6459 | static tree | |
6460 | convert_for_assignment (type, rhs, errtype, fndecl, parmnum) | |
6461 | tree type, rhs; | |
6462 | char *errtype; | |
6463 | tree fndecl; | |
6464 | int parmnum; | |
6465 | { | |
6466 | register enum tree_code codel = TREE_CODE (type); | |
6467 | register tree rhstype; | |
6468 | register enum tree_code coder = TREE_CODE (TREE_TYPE (rhs)); | |
6469 | ||
6470 | if (coder == UNKNOWN_TYPE) | |
6471 | rhs = instantiate_type (type, rhs, 1); | |
6472 | ||
6473 | if (coder == ERROR_MARK) | |
6474 | return error_mark_node; | |
6475 | ||
6476 | if (codel == OFFSET_TYPE) | |
6477 | { | |
6478 | type = TREE_TYPE (type); | |
6479 | codel = TREE_CODE (type); | |
6480 | } | |
6481 | ||
6482 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
6483 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) | |
6484 | rhs = TREE_OPERAND (rhs, 0); | |
6485 | ||
6486 | if (rhs == error_mark_node) | |
6487 | return error_mark_node; | |
6488 | ||
6489 | if (TREE_VALUE (rhs) == error_mark_node) | |
6490 | return error_mark_node; | |
6491 | ||
6492 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6493 | { | |
6494 | rhs = resolve_offset_ref (rhs); | |
6495 | if (rhs == error_mark_node) | |
6496 | return error_mark_node; | |
6497 | rhstype = TREE_TYPE (rhs); | |
6498 | coder = TREE_CODE (rhstype); | |
6499 | } | |
6500 | ||
6501 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
6502 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE | |
6503 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6504 | rhs = default_conversion (rhs); | |
6505 | else if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
6506 | rhs = convert_from_reference (rhs); | |
6507 | ||
6508 | rhstype = TREE_TYPE (rhs); | |
6509 | coder = TREE_CODE (rhstype); | |
6510 | ||
6511 | /* This should no longer change types on us. */ | |
6512 | if (TREE_CODE (rhs) == CONST_DECL) | |
6513 | rhs = DECL_INITIAL (rhs); | |
6514 | else if (TREE_READONLY_DECL_P (rhs)) | |
6515 | rhs = decl_constant_value (rhs); | |
6516 | ||
6517 | if (type == rhstype) | |
6518 | { | |
6519 | overflow_warning (rhs); | |
6520 | return rhs; | |
6521 | } | |
6522 | ||
6523 | if (coder == VOID_TYPE) | |
6524 | { | |
6525 | error ("void value not ignored as it ought to be"); | |
6526 | return error_mark_node; | |
6527 | } | |
6528 | /* Arithmetic types all interconvert. */ | |
37c46b43 MS |
6529 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == BOOLEAN_TYPE |
6530 | || codel == COMPLEX_TYPE) | |
6531 | && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == BOOLEAN_TYPE | |
6532 | || coder == COMPLEX_TYPE)) | |
8d08fdba MS |
6533 | { |
6534 | /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */ | |
6535 | if (coder == REAL_TYPE && codel == INTEGER_TYPE) | |
6536 | { | |
6537 | if (fndecl) | |
6538 | cp_warning ("`%T' used for argument %P of `%D'", | |
6539 | rhstype, parmnum, fndecl); | |
6540 | else | |
6541 | cp_warning ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6542 | } | |
6543 | /* And we should warn if assigning a negative value to | |
6544 | an unsigned variable. */ | |
2986ae00 | 6545 | else if (TREE_UNSIGNED (type) && codel != BOOLEAN_TYPE) |
8d08fdba MS |
6546 | { |
6547 | if (TREE_CODE (rhs) == INTEGER_CST | |
6548 | && TREE_NEGATED_INT (rhs)) | |
6549 | { | |
6550 | if (fndecl) | |
6551 | cp_warning ("negative value `%E' passed as argument %P of `%D'", | |
6552 | rhs, parmnum, fndecl); | |
6553 | else | |
6554 | cp_warning ("%s of negative value `%E' to `%T'", | |
6555 | errtype, rhs, type); | |
6556 | } | |
6557 | overflow_warning (rhs); | |
6558 | if (TREE_CONSTANT (rhs)) | |
6559 | rhs = fold (rhs); | |
6560 | } | |
6561 | ||
6562 | return convert_and_check (type, rhs); | |
6563 | } | |
6564 | /* Conversions involving enums. */ | |
6565 | else if ((codel == ENUMERAL_TYPE | |
6060a796 | 6566 | && (INTEGRAL_CODE_P (coder) || coder == REAL_TYPE)) |
8d08fdba | 6567 | || (coder == ENUMERAL_TYPE |
6060a796 | 6568 | && (INTEGRAL_CODE_P (codel) || codel == REAL_TYPE))) |
8d08fdba | 6569 | { |
37c46b43 | 6570 | return ocp_convert (type, rhs, CONV_IMPLICIT, LOOKUP_NORMAL); |
8d08fdba MS |
6571 | } |
6572 | /* Conversions among pointers */ | |
6573 | else if (codel == POINTER_TYPE | |
6574 | && (coder == POINTER_TYPE | |
6575 | || (coder == RECORD_TYPE | |
6576 | && (IS_SIGNATURE_POINTER (rhstype) | |
6577 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
6578 | { | |
6579 | register tree ttl = TREE_TYPE (type); | |
6580 | register tree ttr; | |
e1cd6e56 | 6581 | int ctt = 0; |
8d08fdba MS |
6582 | |
6583 | if (coder == RECORD_TYPE) | |
6584 | { | |
6585 | rhs = build_optr_ref (rhs); | |
6586 | rhstype = TREE_TYPE (rhs); | |
6587 | } | |
6588 | ttr = TREE_TYPE (rhstype); | |
6589 | ||
6590 | /* If both pointers are of aggregate type, then we | |
6591 | can give better error messages, and save some work | |
6592 | as well. */ | |
6593 | if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE) | |
6594 | { | |
6595 | tree binfo; | |
6596 | ||
6597 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr) | |
6598 | || type == class_star_type_node | |
6599 | || rhstype == class_star_type_node) | |
6600 | binfo = TYPE_BINFO (ttl); | |
6601 | else | |
6602 | binfo = get_binfo (ttl, ttr, 1); | |
6603 | ||
6604 | if (binfo == error_mark_node) | |
6605 | return error_mark_node; | |
6606 | if (binfo == 0) | |
6607 | return error_not_base_type (ttl, ttr); | |
6608 | ||
6609 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
6610 | { | |
6611 | if (fndecl) | |
7177d104 | 6612 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6613 | rhstype, parmnum, fndecl); |
6614 | else | |
7177d104 | 6615 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6616 | errtype, type, rhstype); |
6617 | } | |
6618 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) | |
6619 | { | |
6620 | if (fndecl) | |
7177d104 | 6621 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6622 | rhstype, parmnum, fndecl); |
6623 | else | |
7177d104 | 6624 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6625 | errtype, type, rhstype); |
6626 | } | |
6627 | } | |
6628 | ||
6629 | /* Any non-function converts to a [const][volatile] void * | |
6630 | and vice versa; otherwise, targets must be the same. | |
6631 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
6632 | else if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6633 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
e1cd6e56 | 6634 | || (ctt = comp_target_types (type, rhstype, 1)) |
8d08fdba MS |
6635 | || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) |
6636 | == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
6637 | { | |
6638 | /* ARM $4.8, commentary on p39. */ | |
6639 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6640 | && TREE_CODE (ttr) == OFFSET_TYPE) | |
6641 | { | |
e1cd6e56 | 6642 | cp_error ("no standard conversion from `%T' to `void *'", ttr); |
8d08fdba MS |
6643 | return error_mark_node; |
6644 | } | |
6645 | ||
d11ad92e | 6646 | if (ctt < 0 && TYPE_MAIN_VARIANT (ttl) != TYPE_MAIN_VARIANT (ttr)) |
e1cd6e56 | 6647 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", |
f30432d7 | 6648 | rhstype, type); |
e1cd6e56 | 6649 | |
8d08fdba MS |
6650 | if (TYPE_MAIN_VARIANT (ttl) != void_type_node |
6651 | && TYPE_MAIN_VARIANT (ttr) == void_type_node | |
c73964b2 | 6652 | && ! null_ptr_cst_p (rhs)) |
2986ae00 MS |
6653 | { |
6654 | if (coder == RECORD_TYPE) | |
e1cd6e56 MS |
6655 | cp_pedwarn ("implicit conversion of signature pointer to type `%T'", |
6656 | type); | |
2986ae00 MS |
6657 | else |
6658 | pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s", | |
6659 | errtype); | |
6660 | } | |
8d08fdba MS |
6661 | /* Const and volatile mean something different for function types, |
6662 | so the usual warnings are not appropriate. */ | |
6663 | else if ((TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE) | |
6664 | || (TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE)) | |
6665 | { | |
6666 | if (TREE_CODE (ttl) == OFFSET_TYPE | |
6667 | && binfo_member (TYPE_OFFSET_BASETYPE (ttr), | |
6668 | CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl)))) | |
6669 | { | |
6670 | sorry ("%s between pointer to members converting across virtual baseclasses", errtype); | |
6671 | return error_mark_node; | |
6672 | } | |
2986ae00 | 6673 | else if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) |
8d08fdba MS |
6674 | { |
6675 | if (fndecl) | |
7177d104 | 6676 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6677 | rhstype, parmnum, fndecl); |
6678 | else | |
7177d104 | 6679 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6680 | errtype, type, rhstype); |
6681 | } | |
2986ae00 | 6682 | else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
8d08fdba MS |
6683 | { |
6684 | if (fndecl) | |
7177d104 | 6685 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6686 | rhstype, parmnum, fndecl); |
6687 | else | |
7177d104 | 6688 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6689 | errtype, type, rhstype); |
6690 | } | |
2986ae00 MS |
6691 | else if (TREE_CODE (ttl) == TREE_CODE (ttr) |
6692 | && ! comp_target_types (type, rhstype, 1)) | |
6693 | { | |
6694 | if (fndecl) | |
6695 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness", | |
6696 | rhstype, parmnum, fndecl); | |
6697 | else | |
6698 | cp_pedwarn ("%s to `%T' from `%T' changes signedness", | |
6699 | errtype, type, rhstype); | |
6700 | } | |
8d08fdba MS |
6701 | } |
6702 | } | |
8d08fdba MS |
6703 | else |
6704 | { | |
a0a33927 MS |
6705 | int add_quals = 0, const_parity = 0, volatile_parity = 0; |
6706 | int left_const = 1; | |
8d08fdba MS |
6707 | int unsigned_parity; |
6708 | int nptrs = 0; | |
6709 | ||
a0a33927 MS |
6710 | /* This code is basically a duplicate of comp_ptr_ttypes_real. */ |
6711 | for (; ; ttl = TREE_TYPE (ttl), ttr = TREE_TYPE (ttr)) | |
8d08fdba MS |
6712 | { |
6713 | nptrs -= 1; | |
5566b478 MS |
6714 | const_parity |= (TYPE_READONLY (ttl) < TYPE_READONLY (ttr)); |
6715 | volatile_parity |= (TYPE_VOLATILE (ttl) < TYPE_VOLATILE (ttr)); | |
a0a33927 MS |
6716 | |
6717 | if (! left_const | |
6718 | && (TYPE_READONLY (ttl) > TYPE_READONLY (ttr) | |
6719 | || TYPE_VOLATILE (ttl) > TYPE_VOLATILE (ttr))) | |
6720 | add_quals = 1; | |
6721 | left_const &= TYPE_READONLY (ttl); | |
6722 | ||
a292b002 MS |
6723 | if (TREE_CODE (ttl) != POINTER_TYPE |
6724 | || TREE_CODE (ttr) != POINTER_TYPE) | |
a0a33927 | 6725 | break; |
8d08fdba MS |
6726 | } |
6727 | unsigned_parity = TREE_UNSIGNED (ttl) - TREE_UNSIGNED (ttr); | |
6728 | if (unsigned_parity) | |
a0a33927 MS |
6729 | { |
6730 | if (TREE_UNSIGNED (ttl)) | |
6731 | ttr = unsigned_type (ttr); | |
6732 | else | |
6733 | ttl = unsigned_type (ttl); | |
6734 | } | |
8d08fdba | 6735 | |
e1cd6e56 | 6736 | if (comp_target_types (ttl, ttr, nptrs) > 0) |
8d08fdba | 6737 | { |
a0a33927 MS |
6738 | if (add_quals) |
6739 | { | |
6740 | if (fndecl) | |
6741 | cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'", | |
6742 | rhstype, parmnum, fndecl); | |
6743 | else | |
6744 | cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'", | |
6745 | errtype, type, rhstype); | |
6746 | } | |
8d08fdba MS |
6747 | if (const_parity) |
6748 | { | |
6749 | if (fndecl) | |
a0a33927 | 6750 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6751 | rhstype, parmnum, fndecl); |
6752 | else | |
a0a33927 | 6753 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6754 | errtype, type, rhstype); |
6755 | } | |
6756 | if (volatile_parity) | |
6757 | { | |
6758 | if (fndecl) | |
a0a33927 | 6759 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6760 | rhstype, parmnum, fndecl); |
6761 | else | |
a0a33927 | 6762 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6763 | errtype, type, rhstype); |
6764 | } | |
6765 | if (unsigned_parity > 0) | |
6766 | { | |
6767 | if (fndecl) | |
6768 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned", | |
6769 | rhstype, parmnum, fndecl); | |
6770 | else | |
6771 | cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned", | |
6772 | errtype, type, rhstype); | |
6773 | } | |
6774 | else if (unsigned_parity < 0) | |
6775 | { | |
6776 | if (fndecl) | |
6777 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed", | |
6778 | rhstype, parmnum, fndecl); | |
6779 | else | |
6780 | cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed", | |
6781 | errtype, type, rhstype); | |
6782 | } | |
6783 | ||
6784 | /* C++ is not so friendly about converting function and | |
6785 | member function pointers as C. Emit warnings here. */ | |
6786 | if (TREE_CODE (ttl) == FUNCTION_TYPE | |
6787 | || TREE_CODE (ttl) == METHOD_TYPE) | |
6788 | if (! comptypes (ttl, ttr, 0)) | |
6789 | { | |
6790 | warning ("conflicting function types in %s:", errtype); | |
6791 | cp_warning ("\t`%T' != `%T'", type, rhstype); | |
6792 | } | |
6793 | } | |
8d08fdba MS |
6794 | else |
6795 | { | |
6796 | if (fndecl) | |
6797 | cp_error ("passing `%T' as argument %P of `%D'", | |
6798 | rhstype, parmnum, fndecl); | |
6799 | else | |
6800 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6801 | return error_mark_node; | |
6802 | } | |
6803 | } | |
37c46b43 | 6804 | return cp_convert (type, rhs); |
8d08fdba MS |
6805 | } |
6806 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
6807 | { | |
6808 | /* An explicit constant 0 can convert to a pointer, | |
6809 | but not a 0 that results from casting or folding. */ | |
6810 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) | |
6811 | { | |
6812 | if (fndecl) | |
6813 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6814 | rhstype, parmnum, fndecl); | |
6815 | else | |
6816 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6817 | errtype, type, rhstype); | |
8d08fdba | 6818 | } |
37c46b43 | 6819 | return cp_convert (type, rhs); |
8d08fdba | 6820 | } |
e1cd6e56 | 6821 | else if (codel == INTEGER_TYPE |
8d08fdba MS |
6822 | && (coder == POINTER_TYPE |
6823 | || (coder == RECORD_TYPE | |
6824 | && (IS_SIGNATURE_POINTER (rhstype) | |
f376e137 | 6825 | || TYPE_PTRMEMFUNC_FLAG (rhstype) |
8d08fdba MS |
6826 | || IS_SIGNATURE_REFERENCE (rhstype))))) |
6827 | { | |
6828 | if (fndecl) | |
6829 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6830 | rhstype, parmnum, fndecl); | |
6831 | else | |
6832 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6833 | errtype, type, rhstype); | |
37c46b43 | 6834 | return cp_convert (type, rhs); |
8d08fdba | 6835 | } |
e1cd6e56 MS |
6836 | else if (codel == BOOLEAN_TYPE |
6837 | && (coder == POINTER_TYPE | |
6838 | || (coder == RECORD_TYPE | |
6839 | && (IS_SIGNATURE_POINTER (rhstype) | |
6840 | || TYPE_PTRMEMFUNC_FLAG (rhstype) | |
6841 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
37c46b43 | 6842 | return cp_convert (type, rhs); |
8d08fdba MS |
6843 | |
6844 | /* C++ */ | |
71851aaa | 6845 | else if (((coder == POINTER_TYPE |
8d08fdba | 6846 | && TREE_CODE (TREE_TYPE (rhstype)) == METHOD_TYPE) |
51c184be | 6847 | || integer_zerop (rhs) |
28cbf42c | 6848 | || TYPE_PTRMEMFUNC_P (rhstype)) |
8d08fdba MS |
6849 | && TYPE_PTRMEMFUNC_P (type)) |
6850 | { | |
28cbf42c MS |
6851 | tree ttl = TYPE_PTRMEMFUNC_FN_TYPE (type); |
6852 | tree ttr = (TREE_CODE (rhstype) == POINTER_TYPE ? rhstype | |
6853 | : TYPE_PTRMEMFUNC_FN_TYPE (type)); | |
6854 | int ctt = comp_target_types (ttl, ttr, 1); | |
6855 | ||
6856 | if (ctt < 0) | |
6857 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", | |
6858 | ttr, ttl); | |
6859 | else if (ctt == 0) | |
6860 | cp_error ("%s to `%T' from `%T'", errtype, ttl, ttr); | |
6861 | ||
e92cc029 | 6862 | /* compatible pointer to member functions. */ |
28cbf42c | 6863 | return build_ptrmemfunc (ttl, rhs, 0); |
8d08fdba MS |
6864 | } |
6865 | else if (codel == ERROR_MARK || coder == ERROR_MARK) | |
6866 | return error_mark_node; | |
6867 | ||
6868 | /* This should no longer happen. References are initialized via | |
6869 | `convert_for_initialization'. They should otherwise be | |
6870 | bashed before coming here. */ | |
6871 | else if (codel == REFERENCE_TYPE) | |
db5ae43f | 6872 | my_friendly_abort (317); |
8d08fdba | 6873 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs))) |
51c184be MS |
6874 | { |
6875 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
6876 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
6877 | return nrhs; | |
6878 | } | |
8d08fdba | 6879 | else if (TYPE_HAS_CONSTRUCTOR (type) || IS_AGGR_TYPE (TREE_TYPE (rhs))) |
37c46b43 | 6880 | return cp_convert (type, rhs); |
faf5394a | 6881 | /* Handle anachronistic conversions from (::*)() to cv void* or (*)(). */ |
9a3b49ac MS |
6882 | else if (TREE_CODE (type) == POINTER_TYPE |
6883 | && (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE | |
faf5394a | 6884 | || TYPE_MAIN_VARIANT (TREE_TYPE (type)) == void_type_node) |
9a3b49ac MS |
6885 | && TREE_TYPE (rhs) |
6886 | && TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) | |
37c46b43 | 6887 | return cp_convert (type, rhs); |
8d08fdba MS |
6888 | |
6889 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6890 | return error_mark_node; | |
6891 | } | |
6892 | ||
6893 | /* Convert RHS to be of type TYPE. If EXP is non-zero, | |
6894 | it is the target of the initialization. | |
6895 | ERRTYPE is a string to use in error messages. | |
6896 | ||
6897 | Two major differences between the behavior of | |
6898 | `convert_for_assignment' and `convert_for_initialization' | |
6899 | are that references are bashed in the former, while | |
6900 | copied in the latter, and aggregates are assigned in | |
6901 | the former (operator=) while initialized in the | |
6902 | latter (X(X&)). | |
6903 | ||
6904 | If using constructor make sure no conversion operator exists, if one does | |
878cd289 MS |
6905 | exist, an ambiguity exists. |
6906 | ||
6907 | If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */ | |
e92cc029 | 6908 | |
8d08fdba MS |
6909 | tree |
6910 | convert_for_initialization (exp, type, rhs, flags, errtype, fndecl, parmnum) | |
6911 | tree exp, type, rhs; | |
6912 | int flags; | |
6913 | char *errtype; | |
6914 | tree fndecl; | |
6915 | int parmnum; | |
6916 | { | |
6917 | register enum tree_code codel = TREE_CODE (type); | |
6918 | register tree rhstype; | |
6919 | register enum tree_code coder; | |
6920 | ||
6921 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
6922 | Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ | |
6923 | if (TREE_CODE (rhs) == NOP_EXPR | |
a0a33927 MS |
6924 | && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) |
6925 | && codel != REFERENCE_TYPE) | |
8d08fdba MS |
6926 | rhs = TREE_OPERAND (rhs, 0); |
6927 | ||
6928 | if (rhs == error_mark_node | |
6929 | || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) | |
6930 | return error_mark_node; | |
6931 | ||
6932 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6933 | { | |
6934 | rhs = resolve_offset_ref (rhs); | |
6935 | if (rhs == error_mark_node) | |
6936 | return error_mark_node; | |
8d08fdba MS |
6937 | } |
6938 | ||
8ccc31eb MS |
6939 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) |
6940 | rhs = convert_from_reference (rhs); | |
6941 | ||
8d08fdba | 6942 | if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE |
8ccc31eb MS |
6943 | && TREE_CODE (type) != ARRAY_TYPE |
6944 | && (TREE_CODE (type) != REFERENCE_TYPE | |
6945 | || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)) | |
8d08fdba MS |
6946 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE |
6947 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6948 | rhs = default_conversion (rhs); | |
6949 | ||
6950 | rhstype = TREE_TYPE (rhs); | |
6951 | coder = TREE_CODE (rhstype); | |
6952 | ||
6953 | if (coder == UNKNOWN_TYPE) | |
6954 | { | |
6955 | rhs = instantiate_type (type, rhs, 1); | |
6956 | rhstype = TREE_TYPE (rhs); | |
6957 | coder = TREE_CODE (rhstype); | |
6958 | } | |
6959 | ||
6960 | if (coder == ERROR_MARK) | |
6961 | return error_mark_node; | |
6962 | ||
8d08fdba MS |
6963 | /* We accept references to incomplete types, so we can |
6964 | return here before checking if RHS is of complete type. */ | |
6965 | ||
6966 | if (codel == REFERENCE_TYPE) | |
2986ae00 MS |
6967 | { |
6968 | /* This should eventually happen in convert_arguments. */ | |
6969 | extern int warningcount, errorcount; | |
6970 | int savew, savee; | |
6971 | ||
6972 | if (fndecl) | |
6973 | savew = warningcount, savee = errorcount; | |
6974 | rhs = convert_to_reference (type, rhs, CONV_IMPLICIT, flags, | |
6975 | exp ? exp : error_mark_node); | |
6976 | if (fndecl) | |
6977 | { | |
6978 | if (warningcount > savew) | |
6979 | cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6980 | else if (errorcount > savee) | |
6981 | cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6982 | } | |
6983 | return rhs; | |
6984 | } | |
8d08fdba MS |
6985 | |
6986 | rhs = require_complete_type (rhs); | |
6987 | if (rhs == error_mark_node) | |
6988 | return error_mark_node; | |
6989 | ||
6990 | if (exp != 0) exp = require_complete_type (exp); | |
6991 | if (exp == error_mark_node) | |
6992 | return error_mark_node; | |
6993 | ||
6994 | if (TREE_CODE (rhstype) == REFERENCE_TYPE) | |
6995 | rhstype = TREE_TYPE (rhstype); | |
6996 | ||
6467930b MS |
6997 | type = complete_type (type); |
6998 | ||
8d08fdba MS |
6999 | if (TYPE_LANG_SPECIFIC (type) |
7000 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
7001 | return build_signature_pointer_constructor (type, rhs); | |
7002 | ||
f376e137 MS |
7003 | if (IS_AGGR_TYPE (type) |
7004 | && (TYPE_NEEDS_CONSTRUCTING (type) || TREE_HAS_CONSTRUCTOR (rhs))) | |
8d08fdba | 7005 | { |
faf5394a | 7006 | if (flag_ansi_overloading) |
37c46b43 | 7007 | return ocp_convert (type, rhs, CONV_IMPLICIT|CONV_FORCE_TEMP, flags); |
faf5394a | 7008 | |
8d08fdba MS |
7009 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) |
7010 | { | |
7011 | /* This is sufficient to perform initialization. No need, | |
7012 | apparently, to go through X(X&) to do first-cut | |
7013 | initialization. Return through a TARGET_EXPR so that we get | |
7014 | cleanups if it is used. */ | |
7015 | if (TREE_CODE (rhs) == CALL_EXPR) | |
7016 | { | |
5566b478 | 7017 | rhs = build_cplus_new (type, rhs); |
8d08fdba MS |
7018 | return rhs; |
7019 | } | |
7020 | /* Handle the case of default parameter initialization and | |
7021 | initialization of static variables. */ | |
db5ae43f MS |
7022 | else if (TREE_CODE (rhs) == TARGET_EXPR) |
7023 | return rhs; | |
8d08fdba MS |
7024 | else if (TREE_CODE (rhs) == INDIRECT_REF && TREE_HAS_CONSTRUCTOR (rhs)) |
7025 | { | |
7026 | my_friendly_assert (TREE_CODE (TREE_OPERAND (rhs, 0)) == CALL_EXPR, 318); | |
7027 | if (exp) | |
7028 | { | |
7029 | my_friendly_assert (TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) == NULL_TREE, 316); | |
7030 | TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) | |
7031 | = build_unary_op (ADDR_EXPR, exp, 0); | |
7032 | } | |
7033 | else | |
5566b478 | 7034 | rhs = build_cplus_new (type, TREE_OPERAND (rhs, 0)); |
8d08fdba MS |
7035 | return rhs; |
7036 | } | |
e8abc66f MS |
7037 | else if (TYPE_HAS_TRIVIAL_INIT_REF (type)) |
7038 | return rhs; | |
8d08fdba MS |
7039 | } |
7040 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype) | |
7041 | || (IS_AGGR_TYPE (rhstype) && UNIQUELY_DERIVED_FROM_P (type, rhstype))) | |
7042 | { | |
7043 | if (TYPE_HAS_INIT_REF (type)) | |
7044 | { | |
fc378698 | 7045 | tree init = build_method_call (exp, ctor_identifier, |
e66d884e | 7046 | build_expr_list (NULL_TREE, rhs), |
700f8a87 | 7047 | TYPE_BINFO (type), LOOKUP_NORMAL); |
8d08fdba MS |
7048 | |
7049 | if (init == error_mark_node) | |
7050 | return error_mark_node; | |
7051 | ||
7052 | if (exp == 0) | |
7053 | { | |
5566b478 | 7054 | exp = build_cplus_new (type, init); |
8d08fdba MS |
7055 | return exp; |
7056 | } | |
7057 | ||
7058 | return build (COMPOUND_EXPR, type, init, exp); | |
7059 | } | |
7060 | ||
7061 | /* ??? The following warnings are turned off because | |
7062 | this is another place where the default X(X&) constructor | |
7063 | is implemented. */ | |
7064 | if (TYPE_HAS_ASSIGNMENT (type)) | |
7065 | cp_warning ("bitwise copy: `%T' defines operator=", type); | |
7066 | ||
7067 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
7068 | rhs = convert_from_reference (rhs); | |
7069 | if (type != rhstype) | |
51c184be MS |
7070 | { |
7071 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
7072 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
7073 | rhs = nrhs; | |
7074 | } | |
8d08fdba MS |
7075 | return rhs; |
7076 | } | |
7077 | ||
37c46b43 MS |
7078 | return ocp_convert (type, rhs, CONV_OLD_CONVERT, |
7079 | flags | LOOKUP_NO_CONVERSION); | |
8d08fdba MS |
7080 | } |
7081 | ||
7082 | if (type == TREE_TYPE (rhs)) | |
7083 | { | |
7084 | if (TREE_READONLY_DECL_P (rhs)) | |
7085 | rhs = decl_constant_value (rhs); | |
7086 | return rhs; | |
7087 | } | |
7088 | ||
7089 | return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); | |
7090 | } | |
7091 | \f | |
7092 | /* Expand an ASM statement with operands, handling output operands | |
7093 | that are not variables or INDIRECT_REFS by transforming such | |
7094 | cases into cases that expand_asm_operands can handle. | |
7095 | ||
7096 | Arguments are same as for expand_asm_operands. | |
7097 | ||
7098 | We don't do default conversions on all inputs, because it can screw | |
7099 | up operands that are expected to be in memory. */ | |
7100 | ||
7101 | void | |
7102 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
7103 | tree string, outputs, inputs, clobbers; | |
7104 | int vol; | |
7105 | char *filename; | |
7106 | int line; | |
7107 | { | |
7108 | int noutputs = list_length (outputs); | |
7109 | register int i; | |
7110 | /* o[I] is the place that output number I should be written. */ | |
7111 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
7112 | register tree tail; | |
7113 | ||
7114 | /* Record the contents of OUTPUTS before it is modified. */ | |
7115 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
7116 | o[i] = TREE_VALUE (tail); | |
7117 | ||
7118 | /* Generate the ASM_OPERANDS insn; | |
7119 | store into the TREE_VALUEs of OUTPUTS some trees for | |
7120 | where the values were actually stored. */ | |
7121 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
7122 | ||
7123 | /* Copy all the intermediate outputs into the specified outputs. */ | |
7124 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
7125 | { | |
7126 | if (o[i] != TREE_VALUE (tail)) | |
7127 | { | |
7128 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
9f617717 | 7129 | const0_rtx, VOIDmode, EXPAND_NORMAL); |
8d08fdba MS |
7130 | free_temp_slots (); |
7131 | } | |
7132 | /* Detect modification of read-only values. | |
7133 | (Otherwise done by build_modify_expr.) */ | |
7134 | else | |
7135 | { | |
7136 | tree type = TREE_TYPE (o[i]); | |
7137 | if (TYPE_READONLY (type) | |
7138 | || ((TREE_CODE (type) == RECORD_TYPE | |
7139 | || TREE_CODE (type) == UNION_TYPE) | |
7140 | && C_TYPE_FIELDS_READONLY (type))) | |
7141 | readonly_error (o[i], "modification by `asm'", 1); | |
7142 | } | |
7143 | } | |
7144 | ||
7145 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
7146 | emit_queue (); | |
7147 | } | |
7148 | \f | |
7149 | /* Expand a C `return' statement. | |
7150 | RETVAL is the expression for what to return, | |
7151 | or a null pointer for `return;' with no value. | |
7152 | ||
7153 | C++: upon seeing a `return', we must call destructors on all | |
7154 | variables in scope which had constructors called on them. | |
7155 | This means that if in a destructor, the base class destructors | |
7156 | must be called before returning. | |
7157 | ||
7158 | The RETURN statement in C++ has initialization semantics. */ | |
7159 | ||
7160 | void | |
7161 | c_expand_return (retval) | |
7162 | tree retval; | |
7163 | { | |
7164 | extern struct nesting *cond_stack, *loop_stack, *case_stack; | |
7165 | extern tree dtor_label, ctor_label; | |
7166 | tree result = DECL_RESULT (current_function_decl); | |
7167 | tree valtype = TREE_TYPE (result); | |
8d08fdba MS |
7168 | |
7169 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
7170 | warning ("function declared `noreturn' has a `return' statement"); | |
7171 | ||
7172 | if (retval == error_mark_node) | |
7173 | { | |
7174 | current_function_returns_null = 1; | |
7175 | return; | |
7176 | } | |
7177 | ||
5156628f | 7178 | if (processing_template_decl) |
5566b478 MS |
7179 | { |
7180 | add_tree (build_min_nt (RETURN_STMT, retval)); | |
7181 | return; | |
7182 | } | |
7183 | ||
8d08fdba MS |
7184 | if (retval == NULL_TREE) |
7185 | { | |
7186 | /* A non-named return value does not count. */ | |
7187 | ||
7188 | /* Can't just return from a destructor. */ | |
7189 | if (dtor_label) | |
7190 | { | |
7191 | expand_goto (dtor_label); | |
7192 | return; | |
7193 | } | |
7194 | ||
7195 | if (DECL_CONSTRUCTOR_P (current_function_decl)) | |
4ac14744 | 7196 | retval = current_class_ptr; |
8d08fdba MS |
7197 | else if (DECL_NAME (result) != NULL_TREE |
7198 | && TREE_CODE (valtype) != VOID_TYPE) | |
7199 | retval = result; | |
7200 | else | |
7201 | { | |
7202 | current_function_returns_null = 1; | |
7203 | ||
7204 | if (valtype != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) | |
7205 | { | |
7206 | if (DECL_NAME (DECL_RESULT (current_function_decl)) == NULL_TREE) | |
7207 | { | |
7208 | pedwarn ("`return' with no value, in function returning non-void"); | |
7209 | /* Clear this, so finish_function won't say that we | |
7210 | reach the end of a non-void function (which we don't, | |
7211 | we gave a return!). */ | |
7212 | current_function_returns_null = 0; | |
7213 | } | |
7214 | } | |
7215 | ||
7216 | expand_null_return (); | |
7217 | return; | |
7218 | } | |
7219 | } | |
7220 | else if (DECL_CONSTRUCTOR_P (current_function_decl) | |
4ac14744 | 7221 | && retval != current_class_ptr) |
8d08fdba | 7222 | { |
691c003d MS |
7223 | if (flag_this_is_variable) |
7224 | error ("return from a constructor: use `this = ...' instead"); | |
7225 | else | |
7226 | error ("return from a constructor"); | |
4ac14744 | 7227 | retval = current_class_ptr; |
8d08fdba MS |
7228 | } |
7229 | ||
824b9a4c | 7230 | /* Effective C++ rule 15. See also start_function. */ |
eb448459 | 7231 | if (warn_ecpp |
824b9a4c MS |
7232 | && DECL_NAME (current_function_decl) == ansi_opname[(int) MODIFY_EXPR] |
7233 | && retval != current_class_ref) | |
7234 | cp_warning ("`operator=' should return a reference to `*this'"); | |
7235 | ||
8d08fdba MS |
7236 | if (valtype == NULL_TREE || TREE_CODE (valtype) == VOID_TYPE) |
7237 | { | |
7238 | current_function_returns_null = 1; | |
eb448459 MS |
7239 | if ((pedantic && ! DECL_ARTIFICIAL (current_function_decl)) |
7240 | || TREE_CODE (TREE_TYPE (retval)) != VOID_TYPE) | |
8d08fdba MS |
7241 | pedwarn ("`return' with a value, in function returning void"); |
7242 | expand_return (retval); | |
691c003d | 7243 | return; |
8d08fdba | 7244 | } |
8d08fdba MS |
7245 | |
7246 | /* Now deal with possible C++ hair: | |
7247 | (1) Compute the return value. | |
7248 | (2) If there are aggregate values with destructors which | |
7249 | must be cleaned up, clean them (taking care | |
7250 | not to clobber the return value). | |
7251 | (3) If an X(X&) constructor is defined, the return | |
7252 | value must be returned via that. */ | |
7253 | ||
7254 | if (retval == result | |
8d08fdba | 7255 | || DECL_CONSTRUCTOR_P (current_function_decl)) |
691c003d | 7256 | /* It's already done for us. */; |
9a3b49ac | 7257 | else if (TREE_TYPE (retval) == void_type_node) |
8d08fdba | 7258 | { |
691c003d MS |
7259 | pedwarn ("return of void value in function returning non-void"); |
7260 | expand_expr_stmt (retval); | |
8d08fdba MS |
7261 | retval = 0; |
7262 | } | |
7263 | else | |
7264 | { | |
c1bc6829 JM |
7265 | retval = convert_for_initialization |
7266 | (NULL_TREE, valtype, retval, LOOKUP_NORMAL|LOOKUP_ONLYCONVERTING, | |
7267 | "return", NULL_TREE, 0); | |
691c003d MS |
7268 | |
7269 | if (retval == error_mark_node) | |
8d08fdba | 7270 | { |
691c003d MS |
7271 | /* Avoid warning about control reaching end of function. */ |
7272 | expand_null_return (); | |
7273 | return; | |
8d08fdba | 7274 | } |
c1bc6829 JM |
7275 | |
7276 | /* We can't initialize a register from a NEW_EXPR. */ | |
7277 | else if (! current_function_returns_struct | |
7278 | && TREE_CODE (retval) == TARGET_EXPR | |
7279 | && TREE_CODE (TREE_OPERAND (retval, 1)) == NEW_EXPR) | |
7280 | retval = build (COMPOUND_EXPR, TREE_TYPE (retval), retval, | |
7281 | TREE_OPERAND (retval, 0)); | |
7282 | ||
7283 | /* Add some useful error checking for C++. */ | |
7284 | else if (TREE_CODE (valtype) == REFERENCE_TYPE) | |
7285 | { | |
7286 | tree whats_returned; | |
7287 | ||
7288 | /* Sort through common things to see what it is | |
7289 | we are returning. */ | |
7290 | whats_returned = retval; | |
7291 | if (TREE_CODE (whats_returned) == COMPOUND_EXPR) | |
7292 | { | |
7293 | whats_returned = TREE_OPERAND (whats_returned, 1); | |
7294 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
7295 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7296 | } | |
7297 | while (TREE_CODE (whats_returned) == CONVERT_EXPR | |
7298 | || TREE_CODE (whats_returned) == NOP_EXPR) | |
7299 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7300 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
7301 | { | |
7302 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7303 | while (TREE_CODE (whats_returned) == NEW_EXPR | |
7304 | || TREE_CODE (whats_returned) == TARGET_EXPR) | |
7305 | { | |
7306 | /* Get the target. */ | |
7307 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7308 | warning ("returning reference to temporary"); | |
7309 | } | |
7310 | } | |
7311 | ||
7312 | if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned)) | |
7313 | { | |
7314 | if (TEMP_NAME_P (DECL_NAME (whats_returned))) | |
7315 | warning ("reference to non-lvalue returned"); | |
ffb690bd JM |
7316 | else if (TREE_CODE (TREE_TYPE (whats_returned)) != REFERENCE_TYPE |
7317 | && ! TREE_STATIC (whats_returned) | |
c1bc6829 JM |
7318 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) |
7319 | && !TREE_PUBLIC (whats_returned)) | |
7320 | cp_warning_at ("reference to local variable `%D' returned", whats_returned); | |
7321 | } | |
7322 | } | |
7323 | else if (TREE_CODE (retval) == ADDR_EXPR) | |
7324 | { | |
7325 | tree whats_returned = TREE_OPERAND (retval, 0); | |
7326 | ||
7327 | if (TREE_CODE (whats_returned) == VAR_DECL | |
7328 | && DECL_NAME (whats_returned) | |
7329 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) | |
7330 | && !TREE_STATIC (whats_returned) | |
7331 | && !TREE_PUBLIC (whats_returned)) | |
7332 | cp_warning_at ("address of local variable `%D' returned", whats_returned); | |
7333 | } | |
8d08fdba MS |
7334 | } |
7335 | ||
8d08fdba MS |
7336 | if (retval != NULL_TREE |
7337 | && TREE_CODE_CLASS (TREE_CODE (retval)) == 'd' | |
7338 | && cond_stack == 0 && loop_stack == 0 && case_stack == 0) | |
7339 | current_function_return_value = retval; | |
7340 | ||
691c003d | 7341 | if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) |
8d08fdba | 7342 | { |
691c003d MS |
7343 | /* Here RETVAL is CURRENT_CLASS_PTR, so there's nothing to do. */ |
7344 | expand_goto (ctor_label); | |
8d08fdba | 7345 | } |
691c003d MS |
7346 | |
7347 | if (retval && retval != result) | |
8d08fdba | 7348 | { |
691c003d MS |
7349 | result = build (INIT_EXPR, TREE_TYPE (result), result, retval); |
7350 | TREE_SIDE_EFFECTS (result) = 1; | |
8d08fdba | 7351 | } |
b88c08b6 MS |
7352 | |
7353 | expand_start_target_temps (); | |
7354 | ||
691c003d | 7355 | expand_return (result); |
b88c08b6 MS |
7356 | |
7357 | expand_end_target_temps (); | |
7358 | ||
691c003d | 7359 | current_function_returns_value = 1; |
8d08fdba MS |
7360 | } |
7361 | \f | |
7362 | /* Start a C switch statement, testing expression EXP. | |
7363 | Return EXP if it is valid, an error node otherwise. */ | |
7364 | ||
7365 | tree | |
7366 | c_expand_start_case (exp) | |
7367 | tree exp; | |
7368 | { | |
7369 | tree type; | |
7370 | register enum tree_code code; | |
7371 | ||
7372 | /* Convert from references, etc. */ | |
7373 | exp = default_conversion (exp); | |
7374 | type = TREE_TYPE (exp); | |
7375 | code = TREE_CODE (type); | |
7376 | ||
7377 | if (IS_AGGR_TYPE_CODE (code)) | |
7378 | exp = build_type_conversion (CONVERT_EXPR, integer_type_node, exp, 1); | |
7379 | ||
7380 | if (exp == NULL_TREE) | |
7381 | { | |
7382 | error ("switch quantity not an integer"); | |
7383 | exp = error_mark_node; | |
7384 | } | |
7385 | type = TREE_TYPE (exp); | |
7386 | code = TREE_CODE (type); | |
7387 | ||
7388 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
7389 | { | |
7390 | error ("switch quantity not an integer"); | |
7391 | exp = error_mark_node; | |
7392 | } | |
7393 | else | |
7394 | { | |
e92cc029 | 7395 | tree idx; |
8d08fdba MS |
7396 | |
7397 | exp = default_conversion (exp); | |
7398 | type = TREE_TYPE (exp); | |
e92cc029 | 7399 | idx = get_unwidened (exp, 0); |
8d08fdba MS |
7400 | /* We can't strip a conversion from a signed type to an unsigned, |
7401 | because if we did, int_fits_type_p would do the wrong thing | |
7402 | when checking case values for being in range, | |
7403 | and it's too hard to do the right thing. */ | |
7404 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
e92cc029 MS |
7405 | == TREE_UNSIGNED (TREE_TYPE (idx))) |
7406 | exp = idx; | |
8d08fdba MS |
7407 | } |
7408 | ||
8ccc31eb MS |
7409 | expand_start_case |
7410 | (1, fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (exp), exp)), | |
7411 | type, "switch statement"); | |
8d08fdba MS |
7412 | |
7413 | return exp; | |
7414 | } | |
a0a33927 MS |
7415 | |
7416 | /* CONSTP remembers whether or not all the intervening pointers in the `to' | |
7417 | type have been const. */ | |
e92cc029 | 7418 | |
bd6dd845 | 7419 | static int |
a0a33927 MS |
7420 | comp_ptr_ttypes_real (to, from, constp) |
7421 | tree to, from; | |
7422 | int constp; | |
7423 | { | |
7424 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7425 | { | |
7426 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7427 | return 0; | |
7428 | ||
d11ad92e | 7429 | if (TREE_CODE (from) == OFFSET_TYPE |
c11b6f21 MS |
7430 | && comptypes (TYPE_OFFSET_BASETYPE (from), |
7431 | TYPE_OFFSET_BASETYPE (to), 1)) | |
d11ad92e MS |
7432 | continue; |
7433 | ||
f30432d7 MS |
7434 | /* Const and volatile mean something different for function types, |
7435 | so the usual checks are not appropriate. */ | |
7436 | if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) | |
7437 | { | |
7438 | if (TYPE_READONLY (from) > TYPE_READONLY (to) | |
7439 | || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) | |
7440 | return 0; | |
a0a33927 | 7441 | |
f30432d7 MS |
7442 | if (! constp |
7443 | && (TYPE_READONLY (to) > TYPE_READONLY (from) | |
7444 | || TYPE_VOLATILE (to) > TYPE_READONLY (from))) | |
7445 | return 0; | |
7446 | constp &= TYPE_READONLY (to); | |
7447 | } | |
a0a33927 MS |
7448 | |
7449 | if (TREE_CODE (to) != POINTER_TYPE) | |
7450 | return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); | |
7451 | } | |
7452 | } | |
7453 | ||
7454 | /* When comparing, say, char ** to char const **, this function takes the | |
7455 | 'char *' and 'char const *'. Do not pass non-pointer types to this | |
7456 | function. */ | |
e92cc029 | 7457 | |
a0a33927 MS |
7458 | int |
7459 | comp_ptr_ttypes (to, from) | |
7460 | tree to, from; | |
7461 | { | |
7462 | return comp_ptr_ttypes_real (to, from, 1); | |
7463 | } | |
d11ad92e MS |
7464 | |
7465 | /* Returns 1 if to and from are (possibly multi-level) pointers to the same | |
7466 | type or inheritance-related types, regardless of cv-quals. */ | |
7467 | ||
7468 | int | |
7469 | ptr_reasonably_similar (to, from) | |
7470 | tree to, from; | |
7471 | { | |
7472 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7473 | { | |
7474 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7475 | return 0; | |
7476 | ||
7477 | if (TREE_CODE (from) == OFFSET_TYPE | |
7478 | && comptypes (TYPE_OFFSET_BASETYPE (to), | |
7479 | TYPE_OFFSET_BASETYPE (from), -1)) | |
7480 | continue; | |
7481 | ||
7482 | if (TREE_CODE (to) != POINTER_TYPE) | |
7483 | return comptypes | |
7484 | (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), -1); | |
7485 | } | |
7486 | } | |
c11b6f21 MS |
7487 | |
7488 | /* Like comp_ptr_ttypes, for const_cast. */ | |
7489 | ||
bd6dd845 | 7490 | static int |
c11b6f21 MS |
7491 | comp_ptr_ttypes_const (to, from) |
7492 | tree to, from; | |
7493 | { | |
7494 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7495 | { | |
7496 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7497 | return 0; | |
7498 | ||
7499 | if (TREE_CODE (from) == OFFSET_TYPE | |
7500 | && comptypes (TYPE_OFFSET_BASETYPE (from), | |
7501 | TYPE_OFFSET_BASETYPE (to), 1)) | |
7502 | continue; | |
7503 | ||
7504 | if (TREE_CODE (to) != POINTER_TYPE) | |
7505 | return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); | |
7506 | } | |
7507 | } | |
7508 | ||
7509 | /* Like comp_ptr_ttypes, for reinterpret_cast. */ | |
7510 | ||
bd6dd845 | 7511 | static int |
c11b6f21 MS |
7512 | comp_ptr_ttypes_reinterpret (to, from) |
7513 | tree to, from; | |
7514 | { | |
7515 | int constp = 1; | |
7516 | ||
7517 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7518 | { | |
7519 | if (TREE_CODE (from) == OFFSET_TYPE) | |
7520 | from = TREE_TYPE (from); | |
7521 | if (TREE_CODE (to) == OFFSET_TYPE) | |
7522 | to = TREE_TYPE (to); | |
7523 | ||
7524 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7525 | return 1; | |
7526 | ||
7527 | /* Const and volatile mean something different for function types, | |
7528 | so the usual checks are not appropriate. */ | |
7529 | if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) | |
7530 | { | |
7531 | if (TYPE_READONLY (from) > TYPE_READONLY (to) | |
7532 | || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) | |
7533 | return 0; | |
7534 | ||
7535 | if (! constp | |
7536 | && (TYPE_READONLY (to) > TYPE_READONLY (from) | |
7537 | || TYPE_VOLATILE (to) > TYPE_READONLY (from))) | |
7538 | return 0; | |
7539 | constp &= TYPE_READONLY (to); | |
7540 | } | |
7541 | ||
7542 | if (TREE_CODE (to) != POINTER_TYPE) | |
7543 | return 1; | |
7544 | } | |
7545 | } |