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8d08fdba | 1 | /* Build expressions with type checking for C++ compiler. |
357a4089 | 2 | Copyright (C) 1987, 88, 89, 92, 93, 94, 95, 1996 Free Software Foundation, Inc. |
8d08fdba MS |
3 | Hacked by Michael Tiemann (tiemann@cygnus.com) |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
6bc06b8f RK |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
21 | |
22 | ||
23 | /* This file is part of the C++ front end. | |
24 | It contains routines to build C++ expressions given their operands, | |
25 | including computing the types of the result, C and C++ specific error | |
26 | checks, and some optimization. | |
27 | ||
28 | There are also routines to build RETURN_STMT nodes and CASE_STMT nodes, | |
29 | and to process initializations in declarations (since they work | |
30 | like a strange sort of assignment). */ | |
31 | ||
32 | extern void error (); | |
33 | extern void warning (); | |
34 | ||
35 | #include "config.h" | |
36 | #include <stdio.h> | |
37 | #include "tree.h" | |
38 | #include "rtl.h" | |
39 | #include "cp-tree.h" | |
40 | #include "flags.h" | |
e8abc66f | 41 | #include "output.h" |
8d08fdba | 42 | |
cdf5b885 MS |
43 | int mark_addressable PROTO((tree)); |
44 | static tree convert_for_assignment PROTO((tree, tree, char*, tree, int)); | |
45 | /* static */ tree convert_for_initialization PROTO((tree, tree, tree, int, char*, tree, int)); | |
8d08fdba MS |
46 | extern tree shorten_compare (); |
47 | extern void binary_op_error (); | |
cdf5b885 MS |
48 | static tree pointer_int_sum PROTO((enum tree_code, register tree, register tree)); |
49 | static tree pointer_diff PROTO((register tree, register tree)); | |
50 | #if 0 | |
8d08fdba | 51 | static tree convert_sequence (); |
cdf5b885 MS |
52 | #endif |
53 | /* static */ tree unary_complex_lvalue PROTO((enum tree_code, tree)); | |
8145f082 | 54 | static tree get_delta_difference PROTO((tree, tree, int)); |
8d08fdba MS |
55 | |
56 | extern rtx original_result_rtx; | |
a5894242 | 57 | extern int warn_synth; |
8d08fdba MS |
58 | |
59 | /* Return the target type of TYPE, which meas return T for: | |
60 | T*, T&, T[], T (...), and otherwise, just T. */ | |
61 | ||
62 | tree | |
63 | target_type (type) | |
64 | tree type; | |
65 | { | |
66 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
67 | type = TREE_TYPE (type); | |
68 | while (TREE_CODE (type) == POINTER_TYPE | |
69 | || TREE_CODE (type) == ARRAY_TYPE | |
70 | || TREE_CODE (type) == FUNCTION_TYPE | |
71 | || TREE_CODE (type) == METHOD_TYPE | |
72 | || TREE_CODE (type) == OFFSET_TYPE) | |
73 | type = TREE_TYPE (type); | |
74 | return type; | |
75 | } | |
76 | ||
77 | /* Do `exp = require_complete_type (exp);' to make sure exp | |
78 | does not have an incomplete type. (That includes void types.) */ | |
79 | ||
80 | tree | |
81 | require_complete_type (value) | |
82 | tree value; | |
83 | { | |
5566b478 MS |
84 | tree type; |
85 | ||
86 | if (current_template_parms) | |
87 | return value; | |
88 | ||
89 | type = TREE_TYPE (value); | |
8d08fdba MS |
90 | |
91 | /* First, detect a valid value with a complete type. */ | |
92 | if (TYPE_SIZE (type) != 0 | |
93 | && type != void_type_node | |
94 | && ! (TYPE_LANG_SPECIFIC (type) | |
95 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)) | |
96 | && TYPE_SIZE (SIGNATURE_TYPE (type)) == 0)) | |
97 | return value; | |
98 | ||
99 | /* If we see X::Y, we build an OFFSET_TYPE which has | |
100 | not been laid out. Try to avoid an error by interpreting | |
101 | it as this->X::Y, if reasonable. */ | |
102 | if (TREE_CODE (value) == OFFSET_REF | |
4ac14744 MS |
103 | && current_class_ref != 0 |
104 | && TREE_OPERAND (value, 0) == current_class_ref) | |
8d08fdba MS |
105 | { |
106 | tree base, member = TREE_OPERAND (value, 1); | |
107 | tree basetype = TYPE_OFFSET_BASETYPE (type); | |
108 | my_friendly_assert (TREE_CODE (member) == FIELD_DECL, 305); | |
4ac14744 | 109 | base = convert_pointer_to (basetype, current_class_ptr); |
8d08fdba MS |
110 | value = build (COMPONENT_REF, TREE_TYPE (member), |
111 | build_indirect_ref (base, NULL_PTR), member); | |
112 | return require_complete_type (value); | |
113 | } | |
114 | ||
5566b478 MS |
115 | if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) |
116 | { | |
909e536a | 117 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
118 | if (TYPE_SIZE (type) != 0) |
119 | return value; | |
120 | } | |
121 | ||
8d08fdba MS |
122 | incomplete_type_error (value, type); |
123 | return error_mark_node; | |
124 | } | |
125 | ||
5566b478 MS |
126 | tree |
127 | complete_type (type) | |
128 | tree type; | |
129 | { | |
e92cc029 | 130 | if (type == error_mark_node || TYPE_SIZE (type) != NULL_TREE) |
5566b478 | 131 | ; |
e349ee73 | 132 | else if (TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type)) |
5566b478 MS |
133 | { |
134 | tree t = complete_type (TREE_TYPE (type)); | |
6467930b MS |
135 | if (TYPE_SIZE (t) != NULL_TREE |
136 | && current_template_parms == NULL_TREE) | |
137 | layout_type (type); | |
c73964b2 MS |
138 | TYPE_NEEDS_CONSTRUCTING (type) |
139 | = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (t)); | |
140 | TYPE_NEEDS_DESTRUCTOR (type) | |
141 | = TYPE_NEEDS_DESTRUCTOR (TYPE_MAIN_VARIANT (t)); | |
5566b478 MS |
142 | } |
143 | else if (IS_AGGR_TYPE (type) && CLASSTYPE_TEMPLATE_INSTANTIATION (type)) | |
e76a2646 | 144 | instantiate_class_template (TYPE_MAIN_VARIANT (type)); |
5566b478 MS |
145 | |
146 | return type; | |
147 | } | |
148 | ||
8d08fdba | 149 | /* Return truthvalue of whether type of EXP is instantiated. */ |
e92cc029 | 150 | |
8d08fdba MS |
151 | int |
152 | type_unknown_p (exp) | |
153 | tree exp; | |
154 | { | |
155 | return (TREE_CODE (exp) == TREE_LIST | |
156 | || TREE_TYPE (exp) == unknown_type_node | |
157 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
158 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)); | |
159 | } | |
160 | ||
161 | /* Return truthvalue of whether T is function (or pfn) type. */ | |
e92cc029 | 162 | |
8d08fdba MS |
163 | int |
164 | fntype_p (t) | |
165 | tree t; | |
166 | { | |
167 | return (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE | |
168 | || (TREE_CODE (t) == POINTER_TYPE | |
169 | && (TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE | |
170 | || TREE_CODE (TREE_TYPE (t)) == METHOD_TYPE))); | |
171 | } | |
172 | ||
173 | /* Do `exp = require_instantiated_type (type, exp);' to make sure EXP | |
174 | does not have an uninstantiated type. | |
175 | TYPE is type to instantiate with, if uninstantiated. */ | |
e92cc029 | 176 | |
8d08fdba MS |
177 | tree |
178 | require_instantiated_type (type, exp, errval) | |
179 | tree type, exp, errval; | |
180 | { | |
181 | if (TREE_TYPE (exp) == NULL_TREE) | |
182 | { | |
183 | error ("argument list may not have an initializer list"); | |
184 | return errval; | |
185 | } | |
186 | ||
187 | if (TREE_TYPE (exp) == unknown_type_node | |
188 | || (TREE_CODE (TREE_TYPE (exp)) == OFFSET_TYPE | |
189 | && TREE_TYPE (TREE_TYPE (exp)) == unknown_type_node)) | |
190 | { | |
191 | exp = instantiate_type (type, exp, 1); | |
192 | if (TREE_TYPE (exp) == error_mark_node) | |
193 | return errval; | |
194 | } | |
195 | return exp; | |
196 | } | |
197 | ||
198 | /* Return a variant of TYPE which has all the type qualifiers of LIKE | |
199 | as well as those of TYPE. */ | |
200 | ||
201 | static tree | |
202 | qualify_type (type, like) | |
203 | tree type, like; | |
204 | { | |
205 | int constflag = TYPE_READONLY (type) || TYPE_READONLY (like); | |
206 | int volflag = TYPE_VOLATILE (type) || TYPE_VOLATILE (like); | |
207 | /* @@ Must do member pointers here. */ | |
f376e137 | 208 | return cp_build_type_variant (type, constflag, volflag); |
8d08fdba MS |
209 | } |
210 | \f | |
211 | /* Return the common type of two parameter lists. | |
212 | We assume that comptypes has already been done and returned 1; | |
213 | if that isn't so, this may crash. | |
214 | ||
215 | As an optimization, free the space we allocate if the parameter | |
216 | lists are already common. */ | |
217 | ||
218 | tree | |
219 | commonparms (p1, p2) | |
220 | tree p1, p2; | |
221 | { | |
222 | tree oldargs = p1, newargs, n; | |
223 | int i, len; | |
224 | int any_change = 0; | |
225 | char *first_obj = (char *) oballoc (0); | |
226 | ||
227 | len = list_length (p1); | |
228 | newargs = tree_last (p1); | |
229 | ||
230 | if (newargs == void_list_node) | |
231 | i = 1; | |
232 | else | |
233 | { | |
234 | i = 0; | |
235 | newargs = 0; | |
236 | } | |
237 | ||
238 | for (; i < len; i++) | |
239 | newargs = tree_cons (NULL_TREE, NULL_TREE, newargs); | |
240 | ||
241 | n = newargs; | |
242 | ||
243 | for (i = 0; p1; | |
244 | p1 = TREE_CHAIN (p1), p2 = TREE_CHAIN (p2), n = TREE_CHAIN (n), i++) | |
245 | { | |
246 | if (TREE_PURPOSE (p1) && !TREE_PURPOSE (p2)) | |
247 | { | |
8d08fdba MS |
248 | TREE_PURPOSE (n) = TREE_PURPOSE (p1); |
249 | any_change = 1; | |
250 | } | |
251 | else if (! TREE_PURPOSE (p1)) | |
252 | { | |
253 | if (TREE_PURPOSE (p2)) | |
254 | { | |
255 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); | |
256 | any_change = 1; | |
257 | } | |
258 | } | |
259 | else | |
260 | { | |
1743ca29 | 261 | if (1 != simple_cst_equal (TREE_PURPOSE (p1), TREE_PURPOSE (p2))) |
a4443a08 | 262 | any_change = 1; |
8d08fdba MS |
263 | TREE_PURPOSE (n) = TREE_PURPOSE (p2); |
264 | } | |
265 | if (TREE_VALUE (p1) != TREE_VALUE (p2)) | |
266 | { | |
267 | any_change = 1; | |
268 | TREE_VALUE (n) = common_type (TREE_VALUE (p1), TREE_VALUE (p2)); | |
269 | } | |
270 | else | |
271 | TREE_VALUE (n) = TREE_VALUE (p1); | |
272 | } | |
273 | if (! any_change) | |
274 | { | |
275 | obfree (first_obj); | |
276 | return oldargs; | |
277 | } | |
278 | ||
279 | return newargs; | |
280 | } | |
281 | ||
282 | /* Return the common type of two types. | |
283 | We assume that comptypes has already been done and returned 1; | |
284 | if that isn't so, this may crash. | |
285 | ||
286 | This is the type for the result of most arithmetic operations | |
287 | if the operands have the given two types. | |
288 | ||
289 | We do not deal with enumeral types here because they have already been | |
290 | converted to integer types. */ | |
291 | ||
292 | tree | |
293 | common_type (t1, t2) | |
294 | tree t1, t2; | |
295 | { | |
296 | register enum tree_code code1; | |
297 | register enum tree_code code2; | |
2986ae00 | 298 | tree attributes; |
8d08fdba MS |
299 | |
300 | /* Save time if the two types are the same. */ | |
301 | ||
302 | if (t1 == t2) return t1; | |
303 | ||
304 | /* If one type is nonsense, use the other. */ | |
305 | if (t1 == error_mark_node) | |
306 | return t2; | |
307 | if (t2 == error_mark_node) | |
308 | return t1; | |
309 | ||
2986ae00 MS |
310 | /* Merge the attributes */ |
311 | ||
312 | { register tree a1, a2; | |
313 | a1 = TYPE_ATTRIBUTES (t1); | |
314 | a2 = TYPE_ATTRIBUTES (t2); | |
315 | ||
316 | /* Either one unset? Take the set one. */ | |
317 | ||
318 | if (!(attributes = a1)) | |
319 | attributes = a2; | |
320 | ||
321 | /* One that completely contains the other? Take it. */ | |
322 | ||
323 | else if (a2 && !attribute_list_contained (a1, a2)) | |
324 | if (attribute_list_contained (a2, a1)) | |
325 | attributes = a2; | |
326 | else | |
327 | { | |
2db70b29 DE |
328 | /* Pick the longest list, and hang on the other list. */ |
329 | /* ??? For the moment we punt on the issue of attrs with args. */ | |
2986ae00 MS |
330 | |
331 | if (list_length (a1) < list_length (a2)) | |
332 | attributes = a2, a2 = a1; | |
333 | ||
334 | for (; a2; a2 = TREE_CHAIN (a2)) | |
2db70b29 DE |
335 | if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)), |
336 | attributes) == NULL_TREE) | |
2986ae00 MS |
337 | { |
338 | a1 = copy_node (a2); | |
339 | TREE_CHAIN (a1) = attributes; | |
340 | attributes = a1; | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
8d08fdba MS |
345 | /* Treat an enum type as the unsigned integer type of the same width. */ |
346 | ||
347 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
348 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
349 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
350 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
351 | ||
5566b478 MS |
352 | if (TYPE_PTRMEMFUNC_P (t1)) |
353 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
354 | if (TYPE_PTRMEMFUNC_P (t2)) | |
355 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
356 | ||
8d08fdba MS |
357 | code1 = TREE_CODE (t1); |
358 | code2 = TREE_CODE (t2); | |
359 | ||
360 | switch (code1) | |
361 | { | |
362 | case INTEGER_TYPE: | |
363 | case REAL_TYPE: | |
364 | /* If only one is real, use it as the result. */ | |
365 | ||
366 | if (code1 == REAL_TYPE && code2 != REAL_TYPE) | |
2986ae00 | 367 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
368 | |
369 | if (code2 == REAL_TYPE && code1 != REAL_TYPE) | |
2986ae00 | 370 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
371 | |
372 | /* Both real or both integers; use the one with greater precision. */ | |
373 | ||
374 | if (TYPE_PRECISION (t1) > TYPE_PRECISION (t2)) | |
2986ae00 | 375 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 376 | else if (TYPE_PRECISION (t2) > TYPE_PRECISION (t1)) |
2986ae00 | 377 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
378 | |
379 | /* Same precision. Prefer longs to ints even when same size. */ | |
2986ae00 | 380 | |
8d08fdba MS |
381 | if (TYPE_MAIN_VARIANT (t1) == long_unsigned_type_node |
382 | || TYPE_MAIN_VARIANT (t2) == long_unsigned_type_node) | |
2986ae00 MS |
383 | return build_type_attribute_variant (long_unsigned_type_node, |
384 | attributes); | |
8d08fdba MS |
385 | |
386 | if (TYPE_MAIN_VARIANT (t1) == long_integer_type_node | |
387 | || TYPE_MAIN_VARIANT (t2) == long_integer_type_node) | |
388 | { | |
389 | /* But preserve unsignedness from the other type, | |
390 | since long cannot hold all the values of an unsigned int. */ | |
391 | if (TREE_UNSIGNED (t1) || TREE_UNSIGNED (t2)) | |
2986ae00 MS |
392 | t1 = long_unsigned_type_node; |
393 | else | |
394 | t1 = long_integer_type_node; | |
395 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
396 | } |
397 | ||
e1cd6e56 MS |
398 | if (TYPE_MAIN_VARIANT (t1) == long_double_type_node |
399 | || TYPE_MAIN_VARIANT (t2) == long_double_type_node) | |
400 | return build_type_attribute_variant (long_double_type_node, | |
401 | attributes); | |
402 | ||
8d08fdba MS |
403 | /* Otherwise prefer the unsigned one. */ |
404 | ||
405 | if (TREE_UNSIGNED (t1)) | |
2986ae00 MS |
406 | return build_type_attribute_variant (t1, attributes); |
407 | else | |
408 | return build_type_attribute_variant (t2, attributes); | |
8d08fdba MS |
409 | |
410 | case POINTER_TYPE: | |
411 | case REFERENCE_TYPE: | |
412 | /* For two pointers, do this recursively on the target type, | |
413 | and combine the qualifiers of the two types' targets. */ | |
414 | /* This code was turned off; I don't know why. | |
415 | But ANSI C++ specifies doing this with the qualifiers. | |
416 | So I turned it on again. */ | |
417 | { | |
28cbf42c MS |
418 | tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (t1)); |
419 | tree tt2 = TYPE_MAIN_VARIANT (TREE_TYPE (t2)); | |
8d08fdba MS |
420 | int constp |
421 | = TYPE_READONLY (TREE_TYPE (t1)) || TYPE_READONLY (TREE_TYPE (t2)); | |
422 | int volatilep | |
423 | = TYPE_VOLATILE (TREE_TYPE (t1)) || TYPE_VOLATILE (TREE_TYPE (t2)); | |
28cbf42c MS |
424 | tree target; |
425 | ||
426 | if (tt1 == tt2) | |
427 | target = tt1; | |
7215f9a0 | 428 | else if (tt1 == void_type_node || tt2 == void_type_node) |
28cbf42c | 429 | target = void_type_node; |
7215f9a0 MS |
430 | else |
431 | target = common_type (tt1, tt2); | |
28cbf42c | 432 | |
f376e137 | 433 | target = cp_build_type_variant (target, constp, volatilep); |
8d08fdba | 434 | if (code1 == POINTER_TYPE) |
2986ae00 | 435 | t1 = build_pointer_type (target); |
8d08fdba | 436 | else |
2986ae00 | 437 | t1 = build_reference_type (target); |
71851aaa MS |
438 | t1 = build_type_attribute_variant (t1, attributes); |
439 | ||
440 | if (TREE_CODE (target) == METHOD_TYPE) | |
441 | t1 = build_ptrmemfunc_type (t1); | |
442 | ||
443 | return t1; | |
8d08fdba | 444 | } |
8d08fdba MS |
445 | |
446 | case ARRAY_TYPE: | |
447 | { | |
448 | tree elt = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
449 | /* Save space: see if the result is identical to one of the args. */ | |
450 | if (elt == TREE_TYPE (t1) && TYPE_DOMAIN (t1)) | |
2986ae00 | 451 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 452 | if (elt == TREE_TYPE (t2) && TYPE_DOMAIN (t2)) |
2986ae00 | 453 | return build_type_attribute_variant (t2, attributes); |
8d08fdba | 454 | /* Merge the element types, and have a size if either arg has one. */ |
e349ee73 MS |
455 | t1 = build_cplus_array_type |
456 | (elt, TYPE_DOMAIN (TYPE_DOMAIN (t1) ? t1 : t2)); | |
2986ae00 | 457 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
458 | } |
459 | ||
460 | case FUNCTION_TYPE: | |
461 | /* Function types: prefer the one that specified arg types. | |
462 | If both do, merge the arg types. Also merge the return types. */ | |
463 | { | |
464 | tree valtype = common_type (TREE_TYPE (t1), TREE_TYPE (t2)); | |
465 | tree p1 = TYPE_ARG_TYPES (t1); | |
466 | tree p2 = TYPE_ARG_TYPES (t2); | |
467 | tree rval, raises; | |
468 | ||
469 | /* Save space: see if the result is identical to one of the args. */ | |
470 | if (valtype == TREE_TYPE (t1) && ! p2) | |
2986ae00 | 471 | return build_type_attribute_variant (t1, attributes); |
8d08fdba | 472 | if (valtype == TREE_TYPE (t2) && ! p1) |
2986ae00 | 473 | return build_type_attribute_variant (t2, attributes); |
8d08fdba MS |
474 | |
475 | /* Simple way if one arg fails to specify argument types. */ | |
476 | if (p1 == NULL_TREE || TREE_VALUE (p1) == void_type_node) | |
477 | { | |
478 | rval = build_function_type (valtype, p2); | |
8926095f | 479 | if ((raises = TYPE_RAISES_EXCEPTIONS (t2))) |
f30432d7 | 480 | rval = build_exception_variant (rval, raises); |
2986ae00 | 481 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
482 | } |
483 | raises = TYPE_RAISES_EXCEPTIONS (t1); | |
484 | if (p2 == NULL_TREE || TREE_VALUE (p2) == void_type_node) | |
485 | { | |
486 | rval = build_function_type (valtype, p1); | |
487 | if (raises) | |
f30432d7 | 488 | rval = build_exception_variant (rval, raises); |
2986ae00 | 489 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
490 | } |
491 | ||
492 | rval = build_function_type (valtype, commonparms (p1, p2)); | |
f30432d7 | 493 | rval = build_exception_variant (rval, raises); |
2986ae00 | 494 | return build_type_attribute_variant (rval, attributes); |
8d08fdba MS |
495 | } |
496 | ||
497 | case RECORD_TYPE: | |
498 | case UNION_TYPE: | |
499 | my_friendly_assert (TYPE_MAIN_VARIANT (t1) == t1 | |
500 | && TYPE_MAIN_VARIANT (t2) == t2, 306); | |
501 | ||
e1cd6e56 MS |
502 | if (DERIVED_FROM_P (t1, t2) && binfo_or_else (t1, t2)) |
503 | return build_type_attribute_variant (t1, attributes); | |
504 | else if (binfo_or_else (t2, t1)) | |
505 | return build_type_attribute_variant (t2, attributes); | |
506 | else | |
507 | compiler_error ("common_type called with uncommon aggregate types"); | |
8d08fdba MS |
508 | |
509 | case METHOD_TYPE: | |
71851aaa | 510 | if (TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2))) |
8d08fdba MS |
511 | { |
512 | /* Get this value the long way, since TYPE_METHOD_BASETYPE | |
513 | is just the main variant of this. */ | |
71851aaa | 514 | tree basetype; |
8d08fdba MS |
515 | tree raises, t3; |
516 | ||
71851aaa MS |
517 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
518 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
519 | ||
5566b478 MS |
520 | if (comptypes (b1, b2, 1) |
521 | || (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2))) | |
71851aaa MS |
522 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t2))); |
523 | else | |
524 | { | |
525 | if (binfo_or_else (b2, b1) == NULL_TREE) | |
526 | compiler_error ("common_type called with uncommon method types"); | |
527 | basetype = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t1))); | |
528 | } | |
529 | ||
8d08fdba MS |
530 | raises = TYPE_RAISES_EXCEPTIONS (t1); |
531 | ||
532 | /* If this was a member function type, get back to the | |
533 | original type of type member function (i.e., without | |
534 | the class instance variable up front. */ | |
535 | t1 = build_function_type (TREE_TYPE (t1), TREE_CHAIN (TYPE_ARG_TYPES (t1))); | |
536 | t2 = build_function_type (TREE_TYPE (t2), TREE_CHAIN (TYPE_ARG_TYPES (t2))); | |
537 | t3 = common_type (t1, t2); | |
538 | t3 = build_cplus_method_type (basetype, TREE_TYPE (t3), TYPE_ARG_TYPES (t3)); | |
f30432d7 | 539 | t1 = build_exception_variant (t3, raises); |
8d08fdba | 540 | } |
2986ae00 MS |
541 | else |
542 | compiler_error ("common_type called with uncommon method types"); | |
543 | ||
544 | return build_type_attribute_variant (t1, attributes); | |
8d08fdba MS |
545 | |
546 | case OFFSET_TYPE: | |
71851aaa | 547 | if (TREE_TYPE (t1) == TREE_TYPE (t2)) |
8d08fdba | 548 | { |
28cbf42c MS |
549 | tree b1 = TYPE_OFFSET_BASETYPE (t1); |
550 | tree b2 = TYPE_OFFSET_BASETYPE (t2); | |
2986ae00 | 551 | |
e92cc029 MS |
552 | if (comptypes (b1, b2, 1) |
553 | || (DERIVED_FROM_P (b1, b2) && binfo_or_else (b1, b2))) | |
28cbf42c | 554 | return build_type_attribute_variant (t2, attributes); |
71851aaa MS |
555 | else if (binfo_or_else (b2, b1)) |
556 | return build_type_attribute_variant (t1, attributes); | |
28cbf42c MS |
557 | } |
558 | compiler_error ("common_type called with uncommon member types"); | |
8d08fdba MS |
559 | |
560 | default: | |
2986ae00 | 561 | return build_type_attribute_variant (t1, attributes); |
8d08fdba MS |
562 | } |
563 | } | |
564 | \f | |
565 | /* Return 1 if TYPE1 and TYPE2 raise the same exceptions. */ | |
e92cc029 | 566 | |
8d08fdba | 567 | int |
5566b478 | 568 | compexcepttypes (t1, t2) |
8d08fdba | 569 | tree t1, t2; |
8d08fdba MS |
570 | { |
571 | return TYPE_RAISES_EXCEPTIONS (t1) == TYPE_RAISES_EXCEPTIONS (t2); | |
572 | } | |
573 | ||
574 | static int | |
575 | comp_array_types (cmp, t1, t2, strict) | |
576 | register int (*cmp)(); | |
577 | tree t1, t2; | |
578 | int strict; | |
579 | { | |
580 | tree d1 = TYPE_DOMAIN (t1); | |
581 | tree d2 = TYPE_DOMAIN (t2); | |
582 | ||
583 | /* Target types must match incl. qualifiers. */ | |
584 | if (!(TREE_TYPE (t1) == TREE_TYPE (t2) | |
585 | || (*cmp) (TREE_TYPE (t1), TREE_TYPE (t2), strict))) | |
586 | return 0; | |
587 | ||
588 | /* Sizes must match unless one is missing or variable. */ | |
589 | if (d1 == 0 || d2 == 0 || d1 == d2 | |
590 | || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST | |
591 | || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST | |
592 | || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST | |
593 | || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST) | |
594 | return 1; | |
595 | ||
596 | return ((TREE_INT_CST_LOW (TYPE_MIN_VALUE (d1)) | |
597 | == TREE_INT_CST_LOW (TYPE_MIN_VALUE (d2))) | |
598 | && (TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d1)) | |
599 | == TREE_INT_CST_HIGH (TYPE_MIN_VALUE (d2))) | |
600 | && (TREE_INT_CST_LOW (TYPE_MAX_VALUE (d1)) | |
601 | == TREE_INT_CST_LOW (TYPE_MAX_VALUE (d2))) | |
602 | && (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d1)) | |
603 | == TREE_INT_CST_HIGH (TYPE_MAX_VALUE (d2)))); | |
604 | } | |
605 | ||
606 | /* Return 1 if TYPE1 and TYPE2 are compatible types for assignment | |
607 | or various other operations. This is what ANSI C++ speaks of as | |
608 | "being the same". | |
609 | ||
610 | For C++: argument STRICT says we should be strict about this | |
611 | comparison: | |
612 | ||
613 | 2 : strict, except that if one type is a reference and | |
614 | the other is not, compare the target type of the | |
615 | reference to the type that's not a reference (ARM, p308). | |
59be0cdd | 616 | This is used for checking for invalid overloading. |
8d08fdba | 617 | 1 : strict (compared according to ANSI C) |
a0a33927 | 618 | This is used for checking whether two function decls match. |
8d08fdba MS |
619 | 0 : <= (compared according to C++) |
620 | -1: <= or >= (relaxed) | |
621 | ||
622 | Otherwise, pointers involving base classes and derived classes | |
59be0cdd | 623 | can be mixed as valid: i.e. a pointer to a base class may be assigned |
8d08fdba MS |
624 | to a pointer to one of its derived classes, as per C++. A pointer to |
625 | a derived class may be passed as a parameter to a function expecting a | |
626 | pointer to a base classes. These allowances do not commute. In this | |
627 | case, TYPE1 is assumed to be the base class, and TYPE2 is assumed to | |
628 | be the derived class. */ | |
e92cc029 | 629 | |
8d08fdba MS |
630 | int |
631 | comptypes (type1, type2, strict) | |
632 | tree type1, type2; | |
633 | int strict; | |
634 | { | |
635 | register tree t1 = type1; | |
636 | register tree t2 = type2; | |
2986ae00 | 637 | int attrval, val; |
8d08fdba MS |
638 | |
639 | /* Suppress errors caused by previously reported errors */ | |
640 | ||
641 | if (t1 == t2) | |
642 | return 1; | |
643 | ||
644 | /* This should never happen. */ | |
645 | my_friendly_assert (t1 != error_mark_node, 307); | |
646 | ||
647 | if (t2 == error_mark_node) | |
648 | return 0; | |
649 | ||
650 | if (strict < 0) | |
651 | { | |
652 | /* Treat an enum type as the unsigned integer type of the same width. */ | |
653 | ||
654 | if (TREE_CODE (t1) == ENUMERAL_TYPE) | |
655 | t1 = type_for_size (TYPE_PRECISION (t1), 1); | |
656 | if (TREE_CODE (t2) == ENUMERAL_TYPE) | |
657 | t2 = type_for_size (TYPE_PRECISION (t2), 1); | |
8d08fdba | 658 | |
51c184be MS |
659 | if (t1 == t2) |
660 | return 1; | |
661 | } | |
8d08fdba | 662 | |
5566b478 MS |
663 | if (TYPE_PTRMEMFUNC_P (t1)) |
664 | t1 = TYPE_PTRMEMFUNC_FN_TYPE (t1); | |
665 | if (TYPE_PTRMEMFUNC_P (t2)) | |
666 | t2 = TYPE_PTRMEMFUNC_FN_TYPE (t2); | |
667 | ||
8d08fdba MS |
668 | /* Different classes of types can't be compatible. */ |
669 | ||
670 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
671 | { | |
672 | if (strict == 2 | |
673 | && ((TREE_CODE (t1) == REFERENCE_TYPE) | |
674 | ^ (TREE_CODE (t2) == REFERENCE_TYPE))) | |
675 | { | |
676 | if (TREE_CODE (t1) == REFERENCE_TYPE) | |
677 | return comptypes (TREE_TYPE (t1), t2, 1); | |
678 | return comptypes (t1, TREE_TYPE (t2), 1); | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | if (strict > 1) | |
684 | strict = 1; | |
685 | ||
686 | /* Qualifiers must match. */ | |
687 | ||
688 | if (TYPE_READONLY (t1) != TYPE_READONLY (t2)) | |
689 | return 0; | |
a0a33927 | 690 | if (TYPE_VOLATILE (t1) != TYPE_VOLATILE (t2)) |
8d08fdba MS |
691 | return 0; |
692 | ||
693 | /* Allow for two different type nodes which have essentially the same | |
694 | definition. Note that we already checked for equality of the type | |
695 | type qualifiers (just above). */ | |
696 | ||
697 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
698 | return 1; | |
699 | ||
cffa8729 MS |
700 | /* ??? COMP_TYPE_ATTRIBUTES is currently useless for variables as each |
701 | attribute is its own main variant (`val' will remain 0). */ | |
702 | #ifndef COMP_TYPE_ATTRIBUTES | |
703 | #define COMP_TYPE_ATTRIBUTES(t1,t2) 1 | |
704 | #endif | |
705 | ||
706 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
2986ae00 MS |
707 | if (! (attrval = COMP_TYPE_ATTRIBUTES (t1, t2))) |
708 | return 0; | |
2986ae00 MS |
709 | |
710 | /* 1 if no need for warning yet, 2 if warning cause has been seen. */ | |
711 | val = 0; | |
712 | ||
8d08fdba MS |
713 | switch (TREE_CODE (t1)) |
714 | { | |
715 | case RECORD_TYPE: | |
716 | case UNION_TYPE: | |
5566b478 MS |
717 | if (CLASSTYPE_TEMPLATE_INFO (t1) && CLASSTYPE_TEMPLATE_INFO (t2) |
718 | && CLASSTYPE_TI_TEMPLATE (t1) == CLASSTYPE_TI_TEMPLATE (t2)) | |
719 | { | |
720 | int i = TREE_VEC_LENGTH (CLASSTYPE_TI_ARGS (t1)); | |
721 | tree *p1 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t1), 0); | |
722 | tree *p2 = &TREE_VEC_ELT (CLASSTYPE_TI_ARGS (t2), 0); | |
723 | ||
724 | while (i--) | |
725 | { | |
726 | if (TREE_CODE_CLASS (TREE_CODE (p1[i])) == 't') | |
727 | { | |
728 | if (! comptypes (p1[i], p2[i], 1)) | |
729 | return 0; | |
730 | } | |
731 | else | |
732 | { | |
733 | if (simple_cst_equal (p1[i], p2[i]) <= 0) | |
734 | return 0; | |
735 | } | |
736 | } | |
737 | return 1; | |
738 | } | |
8d08fdba MS |
739 | if (strict <= 0) |
740 | goto look_hard; | |
741 | return 0; | |
742 | ||
743 | case OFFSET_TYPE: | |
f30432d7 MS |
744 | val = (comptypes (build_pointer_type (TYPE_OFFSET_BASETYPE (t1)), |
745 | build_pointer_type (TYPE_OFFSET_BASETYPE (t2)), strict) | |
746 | && comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)); | |
2986ae00 | 747 | break; |
8d08fdba MS |
748 | |
749 | case METHOD_TYPE: | |
5566b478 | 750 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
751 | return 0; |
752 | ||
753 | /* This case is anti-symmetrical! | |
754 | One can pass a base member (or member function) | |
755 | to something expecting a derived member (or member function), | |
756 | but not vice-versa! */ | |
757 | ||
f30432d7 MS |
758 | val = (comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict) |
759 | && compparms (TYPE_ARG_TYPES (t1), | |
760 | TYPE_ARG_TYPES (t2), strict)); | |
2986ae00 MS |
761 | break; |
762 | ||
8d08fdba MS |
763 | case POINTER_TYPE: |
764 | case REFERENCE_TYPE: | |
765 | t1 = TREE_TYPE (t1); | |
766 | t2 = TREE_TYPE (t2); | |
767 | if (t1 == t2) | |
2986ae00 MS |
768 | { |
769 | val = 1; | |
770 | break; | |
771 | } | |
8d08fdba MS |
772 | if (strict <= 0) |
773 | { | |
774 | if (TREE_CODE (t1) == RECORD_TYPE && TREE_CODE (t2) == RECORD_TYPE) | |
775 | { | |
776 | int rval; | |
777 | look_hard: | |
c73964b2 | 778 | rval = t1 == t2 || DERIVED_FROM_P (t1, t2); |
8d08fdba MS |
779 | |
780 | if (rval) | |
2986ae00 MS |
781 | { |
782 | val = 1; | |
783 | break; | |
784 | } | |
8d08fdba | 785 | if (strict < 0) |
2986ae00 | 786 | { |
c73964b2 | 787 | val = DERIVED_FROM_P (t2, t1); |
2986ae00 MS |
788 | break; |
789 | } | |
8d08fdba MS |
790 | } |
791 | return 0; | |
792 | } | |
793 | else | |
2986ae00 MS |
794 | val = comptypes (t1, t2, strict); |
795 | break; | |
8d08fdba MS |
796 | |
797 | case FUNCTION_TYPE: | |
5566b478 | 798 | if (! compexcepttypes (t1, t2)) |
8d08fdba MS |
799 | return 0; |
800 | ||
2986ae00 MS |
801 | val = ((TREE_TYPE (t1) == TREE_TYPE (t2) |
802 | || comptypes (TREE_TYPE (t1), TREE_TYPE (t2), strict)) | |
803 | && compparms (TYPE_ARG_TYPES (t1), TYPE_ARG_TYPES (t2), strict)); | |
804 | break; | |
8d08fdba MS |
805 | |
806 | case ARRAY_TYPE: | |
807 | /* Target types must match incl. qualifiers. */ | |
2986ae00 MS |
808 | val = comp_array_types (comptypes, t1, t2, strict); |
809 | break; | |
8d08fdba | 810 | |
51c184be | 811 | case TEMPLATE_TYPE_PARM: |
f30432d7 | 812 | return TEMPLATE_TYPE_IDX (t1) == TEMPLATE_TYPE_IDX (t2); |
e76a2646 MS |
813 | |
814 | case TYPENAME_TYPE: | |
815 | if (TYPE_IDENTIFIER (t1) != TYPE_IDENTIFIER (t2)) | |
816 | return 0; | |
817 | return comptypes (TYPE_CONTEXT (t1), TYPE_CONTEXT (t2), 1); | |
8d08fdba | 818 | } |
2986ae00 | 819 | return attrval == 2 && val == 1 ? 2 : val; |
8d08fdba MS |
820 | } |
821 | ||
822 | /* Return 1 if TTL and TTR are pointers to types that are equivalent, | |
823 | ignoring their qualifiers. | |
824 | ||
825 | NPTRS is the number of pointers we can strip off and keep cool. | |
826 | This is used to permit (for aggr A, aggr B) A, B* to convert to A*, | |
827 | but to not permit B** to convert to A**. */ | |
828 | ||
829 | int | |
830 | comp_target_types (ttl, ttr, nptrs) | |
831 | tree ttl, ttr; | |
832 | int nptrs; | |
833 | { | |
834 | ttl = TYPE_MAIN_VARIANT (ttl); | |
835 | ttr = TYPE_MAIN_VARIANT (ttr); | |
836 | if (ttl == ttr) | |
837 | return 1; | |
838 | ||
839 | if (TREE_CODE (ttr) != TREE_CODE (ttl)) | |
840 | return 0; | |
841 | ||
842 | if (TREE_CODE (ttr) == POINTER_TYPE) | |
a0a33927 | 843 | { |
7215f9a0 MS |
844 | ttl = TREE_TYPE (ttl); |
845 | ttr = TREE_TYPE (ttr); | |
846 | ||
847 | if (nptrs > 0) | |
848 | { | |
71851aaa | 849 | if (TREE_CODE (ttl) == VOID_TYPE |
7215f9a0 MS |
850 | && TREE_CODE (ttr) != FUNCTION_TYPE |
851 | && TREE_CODE (ttr) != METHOD_TYPE | |
852 | && TREE_CODE (ttr) != OFFSET_TYPE) | |
853 | return 1; | |
854 | else if (TREE_CODE (ttr) == VOID_TYPE | |
855 | && TREE_CODE (ttl) != FUNCTION_TYPE | |
856 | && TREE_CODE (ttl) != METHOD_TYPE | |
857 | && TREE_CODE (ttl) != OFFSET_TYPE) | |
858 | return -1; | |
71851aaa MS |
859 | else if (TREE_CODE (ttl) == POINTER_TYPE |
860 | || TREE_CODE (ttl) == ARRAY_TYPE) | |
07674418 MS |
861 | { |
862 | if (comp_ptr_ttypes (ttl, ttr)) | |
863 | return 1; | |
864 | else if (comp_ptr_ttypes (ttr, ttl)) | |
865 | return -1; | |
866 | return 0; | |
867 | } | |
7215f9a0 MS |
868 | } |
869 | ||
f30432d7 MS |
870 | /* Const and volatile mean something different for function types, |
871 | so the usual checks are not appropriate. */ | |
872 | if (TREE_CODE (ttl) == FUNCTION_TYPE || TREE_CODE (ttl) == METHOD_TYPE) | |
873 | return comp_target_types (ttl, ttr, nptrs - 1); | |
874 | ||
875 | /* Make sure that the cv-quals change only in the same direction as | |
876 | the target type. */ | |
877 | { | |
878 | int t; | |
879 | int c = TYPE_READONLY (ttl) - TYPE_READONLY (ttr); | |
880 | int v = TYPE_VOLATILE (ttl) - TYPE_VOLATILE (ttr); | |
881 | ||
882 | if ((c > 0 && v < 0) || (c < 0 && v > 0)) | |
883 | return 0; | |
884 | ||
885 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr)) | |
886 | return (c + v < 0) ? -1 : 1; | |
887 | ||
888 | t = comp_target_types (ttl, ttr, nptrs - 1); | |
889 | if ((t == 1 && c + v >= 0) || (t == -1 && c + v <= 0)) | |
890 | return t; | |
891 | ||
892 | return 0; | |
893 | } | |
a0a33927 | 894 | } |
8d08fdba MS |
895 | |
896 | if (TREE_CODE (ttr) == REFERENCE_TYPE) | |
897 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
898 | if (TREE_CODE (ttr) == ARRAY_TYPE) | |
899 | return comp_array_types (comp_target_types, ttl, ttr, 0); | |
900 | else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE) | |
901 | if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
8926095f | 902 | switch (comp_target_parms (TYPE_ARG_TYPES (ttl), TYPE_ARG_TYPES (ttr), 1)) |
8d08fdba MS |
903 | { |
904 | case 0: | |
905 | return 0; | |
906 | case 1: | |
907 | return 1; | |
908 | case 2: | |
e1cd6e56 | 909 | return -1; |
8d08fdba MS |
910 | default: |
911 | my_friendly_abort (112); | |
912 | } | |
913 | else | |
914 | return 0; | |
915 | ||
916 | /* for C++ */ | |
917 | else if (TREE_CODE (ttr) == OFFSET_TYPE) | |
918 | { | |
919 | /* Contravariance: we can assign a pointer to base member to a pointer | |
920 | to derived member. Note difference from simple pointer case, where | |
921 | we can pass a pointer to derived to a pointer to base. */ | |
922 | if (comptypes (TYPE_OFFSET_BASETYPE (ttr), TYPE_OFFSET_BASETYPE (ttl), 0)) | |
923 | return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs); | |
924 | else if (comptypes (TYPE_OFFSET_BASETYPE (ttl), TYPE_OFFSET_BASETYPE (ttr), 0) | |
925 | && comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs)) | |
e1cd6e56 | 926 | return -1; |
8d08fdba MS |
927 | } |
928 | else if (IS_AGGR_TYPE (ttl)) | |
929 | { | |
930 | if (nptrs < 0) | |
931 | return 0; | |
f30432d7 | 932 | if (comptypes (build_pointer_type (ttl), build_pointer_type (ttr), 0)) |
e1cd6e56 | 933 | return 1; |
f30432d7 | 934 | if (comptypes (build_pointer_type (ttr), build_pointer_type (ttl), 0)) |
e1cd6e56 MS |
935 | return -1; |
936 | return 0; | |
8d08fdba MS |
937 | } |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | /* If two types share a common base type, return that basetype. | |
943 | If there is not a unique most-derived base type, this function | |
944 | returns ERROR_MARK_NODE. */ | |
e92cc029 | 945 | |
8d08fdba MS |
946 | tree |
947 | common_base_type (tt1, tt2) | |
948 | tree tt1, tt2; | |
949 | { | |
5566b478 | 950 | tree best = NULL_TREE; |
8d08fdba MS |
951 | int i; |
952 | ||
953 | /* If one is a baseclass of another, that's good enough. */ | |
954 | if (UNIQUELY_DERIVED_FROM_P (tt1, tt2)) | |
955 | return tt1; | |
956 | if (UNIQUELY_DERIVED_FROM_P (tt2, tt1)) | |
957 | return tt2; | |
958 | ||
8d08fdba MS |
959 | /* Otherwise, try to find a unique baseclass of TT1 |
960 | that is shared by TT2, and follow that down. */ | |
961 | for (i = CLASSTYPE_N_BASECLASSES (tt1)-1; i >= 0; i--) | |
962 | { | |
963 | tree basetype = TYPE_BINFO_BASETYPE (tt1, i); | |
964 | tree trial = common_base_type (basetype, tt2); | |
965 | if (trial) | |
966 | { | |
967 | if (trial == error_mark_node) | |
968 | return trial; | |
969 | if (best == NULL_TREE) | |
970 | best = trial; | |
971 | else if (best != trial) | |
972 | return error_mark_node; | |
973 | } | |
974 | } | |
975 | ||
976 | /* Same for TT2. */ | |
977 | for (i = CLASSTYPE_N_BASECLASSES (tt2)-1; i >= 0; i--) | |
978 | { | |
979 | tree basetype = TYPE_BINFO_BASETYPE (tt2, i); | |
980 | tree trial = common_base_type (tt1, basetype); | |
981 | if (trial) | |
982 | { | |
983 | if (trial == error_mark_node) | |
984 | return trial; | |
985 | if (best == NULL_TREE) | |
986 | best = trial; | |
987 | else if (best != trial) | |
988 | return error_mark_node; | |
989 | } | |
990 | } | |
991 | return best; | |
992 | } | |
993 | \f | |
994 | /* Subroutines of `comptypes'. */ | |
995 | ||
996 | /* Return 1 if two parameter type lists PARMS1 and PARMS2 | |
997 | are equivalent in the sense that functions with those parameter types | |
998 | can have equivalent types. | |
999 | If either list is empty, we win. | |
1000 | Otherwise, the two lists must be equivalent, element by element. | |
1001 | ||
1002 | C++: See comment above about TYPE1, TYPE2, STRICT. | |
1003 | If STRICT == 3, it means checking is strict, but do not compare | |
1004 | default parameter values. */ | |
e92cc029 | 1005 | |
8d08fdba MS |
1006 | int |
1007 | compparms (parms1, parms2, strict) | |
1008 | tree parms1, parms2; | |
1009 | int strict; | |
1010 | { | |
1011 | register tree t1 = parms1, t2 = parms2; | |
1012 | ||
1013 | /* An unspecified parmlist matches any specified parmlist | |
1014 | whose argument types don't need default promotions. */ | |
1015 | ||
8926095f MS |
1016 | if (strict <= 0 && t1 == 0) |
1017 | return self_promoting_args_p (t2); | |
1018 | if (strict < 0 && t2 == 0) | |
1019 | return self_promoting_args_p (t1); | |
8d08fdba MS |
1020 | |
1021 | while (1) | |
1022 | { | |
1023 | if (t1 == 0 && t2 == 0) | |
1024 | return 1; | |
1025 | /* If one parmlist is shorter than the other, | |
1026 | they fail to match, unless STRICT is <= 0. */ | |
1027 | if (t1 == 0 || t2 == 0) | |
1028 | { | |
1029 | if (strict > 0) | |
1030 | return 0; | |
1031 | if (strict < 0) | |
1032 | return 1; | |
1033 | if (strict == 0) | |
1034 | return t1 && TREE_PURPOSE (t1); | |
1035 | } | |
1036 | if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict)) | |
1037 | { | |
1038 | if (strict > 0) | |
1039 | return 0; | |
1040 | if (strict == 0) | |
1041 | return t2 == void_list_node && TREE_PURPOSE (t1); | |
1042 | return TREE_PURPOSE (t1) || TREE_PURPOSE (t2); | |
1043 | } | |
8d08fdba MS |
1044 | |
1045 | t1 = TREE_CHAIN (t1); | |
1046 | t2 = TREE_CHAIN (t2); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | /* This really wants return whether or not parameter type lists | |
1051 | would make their owning functions assignment compatible or not. */ | |
e92cc029 | 1052 | |
8d08fdba MS |
1053 | int |
1054 | comp_target_parms (parms1, parms2, strict) | |
1055 | tree parms1, parms2; | |
1056 | int strict; | |
1057 | { | |
1058 | register tree t1 = parms1, t2 = parms2; | |
1059 | int warn_contravariance = 0; | |
1060 | ||
1061 | /* An unspecified parmlist matches any specified parmlist | |
1062 | whose argument types don't need default promotions. | |
1063 | @@@ see 13.3.3 for a counterexample... */ | |
1064 | ||
1065 | if (t1 == 0 && t2 != 0) | |
1066 | { | |
1067 | cp_pedwarn ("ANSI C++ prohibits conversion from `(%#T)' to `(...)'", | |
1068 | parms2); | |
1069 | return self_promoting_args_p (t2); | |
1070 | } | |
1071 | if (t2 == 0) | |
1072 | return self_promoting_args_p (t1); | |
1073 | ||
1074 | for (; t1 || t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2)) | |
1075 | { | |
1076 | tree p1, p2; | |
1077 | ||
1078 | /* If one parmlist is shorter than the other, | |
1079 | they fail to match, unless STRICT is <= 0. */ | |
1080 | if (t1 == 0 || t2 == 0) | |
1081 | { | |
1082 | if (strict > 0) | |
1083 | return 0; | |
1084 | if (strict < 0) | |
1085 | return 1 + warn_contravariance; | |
1086 | return ((t1 && TREE_PURPOSE (t1)) + warn_contravariance); | |
1087 | } | |
1088 | p1 = TREE_VALUE (t1); | |
1089 | p2 = TREE_VALUE (t2); | |
1090 | if (p1 == p2) | |
1091 | continue; | |
7177d104 | 1092 | |
8d08fdba MS |
1093 | if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE) |
1094 | || (TREE_CODE (p1) == REFERENCE_TYPE && TREE_CODE (p2) == REFERENCE_TYPE)) | |
1095 | { | |
1096 | if (strict <= 0 | |
1097 | && (TYPE_MAIN_VARIANT (TREE_TYPE (p1)) | |
1098 | == TYPE_MAIN_VARIANT (TREE_TYPE (p2)))) | |
1099 | continue; | |
1100 | ||
1101 | /* The following is wrong for contravariance, | |
1102 | but many programs depend on it. */ | |
1103 | if (TREE_TYPE (p1) == void_type_node) | |
1104 | continue; | |
1105 | if (TREE_TYPE (p2) == void_type_node) | |
1106 | { | |
1107 | warn_contravariance = 1; | |
1108 | continue; | |
1109 | } | |
1110 | if (IS_AGGR_TYPE (TREE_TYPE (p1))) | |
1111 | { | |
1112 | if (comptypes (p2, p1, 0) == 0) | |
1113 | { | |
1114 | if (comptypes (p1, p2, 0) != 0) | |
1115 | warn_contravariance = 1; | |
1116 | else | |
1117 | return 0; | |
1118 | } | |
1119 | continue; | |
1120 | } | |
1121 | } | |
1122 | /* Note backwards order due to contravariance. */ | |
1123 | if (comp_target_types (p2, p1, 1) == 0) | |
1124 | { | |
1125 | if (comp_target_types (p1, p2, 1)) | |
1126 | { | |
1127 | warn_contravariance = 1; | |
1128 | continue; | |
1129 | } | |
1130 | if (strict != 0) | |
1131 | return 0; | |
8d08fdba MS |
1132 | } |
1133 | /* Target types are compatible--just make sure that if | |
1134 | we use parameter lists, that they are ok as well. */ | |
1135 | if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE) | |
1136 | switch (comp_target_parms (TYPE_ARG_TYPES (p1), | |
1137 | TYPE_ARG_TYPES (p2), | |
1138 | strict)) | |
1139 | { | |
1140 | case 0: | |
1141 | return 0; | |
1142 | case 1: | |
1143 | break; | |
1144 | case 2: | |
1145 | warn_contravariance = 1; | |
1146 | } | |
1147 | ||
1148 | if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2)) | |
1149 | { | |
1150 | int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)); | |
1151 | if (cmp < 0) | |
1152 | my_friendly_abort (114); | |
1153 | if (cmp == 0) | |
1154 | return 0; | |
1155 | } | |
1156 | } | |
1157 | return 1 + warn_contravariance; | |
1158 | } | |
1159 | ||
1160 | /* Return 1 if PARMS specifies a fixed number of parameters | |
1161 | and none of their types is affected by default promotions. */ | |
1162 | ||
8926095f | 1163 | int |
8d08fdba MS |
1164 | self_promoting_args_p (parms) |
1165 | tree parms; | |
1166 | { | |
1167 | register tree t; | |
1168 | for (t = parms; t; t = TREE_CHAIN (t)) | |
1169 | { | |
1170 | register tree type = TREE_VALUE (t); | |
1171 | ||
1172 | if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
1173 | return 0; | |
1174 | ||
cffa8729 | 1175 | if (type == 0) |
8d08fdba MS |
1176 | return 0; |
1177 | ||
cffa8729 | 1178 | if (TYPE_MAIN_VARIANT (type) == float_type_node) |
8d08fdba MS |
1179 | return 0; |
1180 | ||
1181 | if (C_PROMOTING_INTEGER_TYPE_P (type)) | |
1182 | return 0; | |
1183 | } | |
1184 | return 1; | |
1185 | } | |
1186 | \f | |
1187 | /* Return an unsigned type the same as TYPE in other respects. | |
1188 | ||
1189 | C++: must make these work for type variants as well. */ | |
1190 | ||
1191 | tree | |
1192 | unsigned_type (type) | |
1193 | tree type; | |
1194 | { | |
1195 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1196 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1197 | return unsigned_char_type_node; | |
1198 | if (type1 == integer_type_node) | |
1199 | return unsigned_type_node; | |
1200 | if (type1 == short_integer_type_node) | |
1201 | return short_unsigned_type_node; | |
1202 | if (type1 == long_integer_type_node) | |
1203 | return long_unsigned_type_node; | |
1204 | if (type1 == long_long_integer_type_node) | |
1205 | return long_long_unsigned_type_node; | |
cffa8729 MS |
1206 | if (type1 == intDI_type_node) |
1207 | return unsigned_intDI_type_node; | |
1208 | if (type1 == intSI_type_node) | |
1209 | return unsigned_intSI_type_node; | |
1210 | if (type1 == intHI_type_node) | |
1211 | return unsigned_intHI_type_node; | |
1212 | if (type1 == intQI_type_node) | |
1213 | return unsigned_intQI_type_node; | |
8d08fdba MS |
1214 | return type; |
1215 | } | |
1216 | ||
1217 | /* Return a signed type the same as TYPE in other respects. */ | |
1218 | ||
1219 | tree | |
1220 | signed_type (type) | |
1221 | tree type; | |
1222 | { | |
1223 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1224 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1225 | return signed_char_type_node; | |
1226 | if (type1 == unsigned_type_node) | |
1227 | return integer_type_node; | |
1228 | if (type1 == short_unsigned_type_node) | |
1229 | return short_integer_type_node; | |
1230 | if (type1 == long_unsigned_type_node) | |
1231 | return long_integer_type_node; | |
1232 | if (type1 == long_long_unsigned_type_node) | |
1233 | return long_long_integer_type_node; | |
cffa8729 MS |
1234 | if (type1 == unsigned_intDI_type_node) |
1235 | return intDI_type_node; | |
1236 | if (type1 == unsigned_intSI_type_node) | |
1237 | return intSI_type_node; | |
1238 | if (type1 == unsigned_intHI_type_node) | |
1239 | return intHI_type_node; | |
1240 | if (type1 == unsigned_intQI_type_node) | |
1241 | return intQI_type_node; | |
8d08fdba MS |
1242 | return type; |
1243 | } | |
1244 | ||
1245 | /* Return a type the same as TYPE except unsigned or | |
1246 | signed according to UNSIGNEDP. */ | |
1247 | ||
1248 | tree | |
1249 | signed_or_unsigned_type (unsignedp, type) | |
1250 | int unsignedp; | |
1251 | tree type; | |
1252 | { | |
39211cd5 | 1253 | if (! INTEGRAL_TYPE_P (type)) |
8d08fdba MS |
1254 | return type; |
1255 | if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node)) | |
1256 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1257 | if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)) | |
1258 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1259 | if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node)) | |
1260 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1261 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node)) | |
1262 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1263 | if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node)) | |
1264 | return (unsignedp ? long_long_unsigned_type_node | |
1265 | : long_long_integer_type_node); | |
1266 | return type; | |
1267 | } | |
1268 | ||
cffa8729 MS |
1269 | /* Compute the value of the `sizeof' operator. */ |
1270 | ||
8d08fdba MS |
1271 | tree |
1272 | c_sizeof (type) | |
1273 | tree type; | |
1274 | { | |
1275 | enum tree_code code = TREE_CODE (type); | |
1276 | tree t; | |
1277 | ||
5566b478 MS |
1278 | if (current_template_parms) |
1279 | return build_min (SIZEOF_EXPR, sizetype, type); | |
1280 | ||
8d08fdba MS |
1281 | if (code == FUNCTION_TYPE) |
1282 | { | |
1283 | if (pedantic || warn_pointer_arith) | |
1284 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1285 | return size_int (1); | |
1286 | } | |
1287 | if (code == METHOD_TYPE) | |
1288 | { | |
1289 | if (pedantic || warn_pointer_arith) | |
1290 | pedwarn ("ANSI C++ forbids taking the sizeof a method type"); | |
1291 | return size_int (1); | |
1292 | } | |
1293 | if (code == VOID_TYPE) | |
1294 | { | |
1295 | if (pedantic || warn_pointer_arith) | |
1296 | pedwarn ("ANSI C++ forbids taking the sizeof a void type"); | |
1297 | return size_int (1); | |
1298 | } | |
1299 | if (code == ERROR_MARK) | |
1300 | return size_int (1); | |
1301 | ||
1302 | /* ARM $5.3.2: ``When applied to a reference, the result is the size of the | |
1303 | referenced object.'' */ | |
1304 | if (code == REFERENCE_TYPE) | |
1305 | type = TREE_TYPE (type); | |
1306 | ||
1307 | /* We couldn't find anything in the ARM or the draft standard that says, | |
1308 | one way or the other, if doing sizeof on something that doesn't have | |
1309 | an object associated with it is correct or incorrect. For example, if | |
1310 | you declare `struct S { char str[16]; };', and in your program do | |
1311 | a `sizeof (S::str)', should we flag that as an error or should we give | |
1312 | the size of it? Since it seems like a reasonable thing to do, we'll go | |
1313 | with giving the value. */ | |
1314 | if (code == OFFSET_TYPE) | |
1315 | type = TREE_TYPE (type); | |
1316 | ||
1317 | /* @@ This also produces an error for a signature ref. | |
1318 | In that case we should be able to do better. */ | |
1319 | if (IS_SIGNATURE (type)) | |
1320 | { | |
1321 | error ("`sizeof' applied to a signature type"); | |
1322 | return size_int (0); | |
1323 | } | |
1324 | ||
5566b478 | 1325 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba | 1326 | { |
5566b478 | 1327 | cp_error ("`sizeof' applied to incomplete type `%T'", type); |
8d08fdba MS |
1328 | return size_int (0); |
1329 | } | |
1330 | ||
1331 | /* Convert in case a char is more than one unit. */ | |
1332 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
1333 | size_int (TYPE_PRECISION (char_type_node))); | |
1334 | /* size_binop does not put the constant in range, so do it now. */ | |
1335 | if (TREE_CODE (t) == INTEGER_CST && force_fit_type (t, 0)) | |
1336 | TREE_CONSTANT_OVERFLOW (t) = TREE_OVERFLOW (t) = 1; | |
1337 | return t; | |
1338 | } | |
1339 | ||
5566b478 MS |
1340 | tree |
1341 | expr_sizeof (e) | |
1342 | tree e; | |
1343 | { | |
1344 | if (current_template_parms) | |
1345 | return build_min (SIZEOF_EXPR, sizetype, e); | |
1346 | ||
1347 | if (TREE_CODE (e) == COMPONENT_REF | |
1348 | && DECL_BIT_FIELD (TREE_OPERAND (e, 1))) | |
1349 | error ("sizeof applied to a bit-field"); | |
1350 | /* ANSI says arrays and functions are converted inside comma. | |
1351 | But we can't really convert them in build_compound_expr | |
1352 | because that would break commas in lvalues. | |
1353 | So do the conversion here if operand was a comma. */ | |
1354 | if (TREE_CODE (e) == COMPOUND_EXPR | |
1355 | && (TREE_CODE (TREE_TYPE (e)) == ARRAY_TYPE | |
1356 | || TREE_CODE (TREE_TYPE (e)) == FUNCTION_TYPE)) | |
1357 | e = default_conversion (e); | |
1358 | else if (TREE_CODE (e) == TREE_LIST) | |
1359 | { | |
1360 | tree t = TREE_VALUE (e); | |
1361 | if (t != NULL_TREE | |
1362 | && ((TREE_TYPE (t) | |
1363 | && TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE) | |
1364 | || is_overloaded_fn (t))) | |
1365 | pedwarn ("ANSI C++ forbids taking the sizeof a function type"); | |
1366 | } | |
1367 | return c_sizeof (TREE_TYPE (e)); | |
1368 | } | |
1369 | ||
8d08fdba MS |
1370 | tree |
1371 | c_sizeof_nowarn (type) | |
1372 | tree type; | |
1373 | { | |
1374 | enum tree_code code = TREE_CODE (type); | |
1375 | tree t; | |
1376 | ||
1377 | if (code == FUNCTION_TYPE | |
1378 | || code == METHOD_TYPE | |
1379 | || code == VOID_TYPE | |
1380 | || code == ERROR_MARK) | |
1381 | return size_int (1); | |
1382 | if (code == REFERENCE_TYPE) | |
1383 | type = TREE_TYPE (type); | |
1384 | ||
1385 | if (TYPE_SIZE (type) == 0) | |
9e9ff709 | 1386 | return size_int (0); |
8d08fdba MS |
1387 | |
1388 | /* Convert in case a char is more than one unit. */ | |
1389 | t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type), | |
e1cd6e56 | 1390 | size_int (TYPE_PRECISION (char_type_node))); |
8d08fdba MS |
1391 | force_fit_type (t, 0); |
1392 | return t; | |
1393 | } | |
1394 | ||
1395 | /* Implement the __alignof keyword: Return the minimum required | |
1396 | alignment of TYPE, measured in bytes. */ | |
1397 | ||
1398 | tree | |
1399 | c_alignof (type) | |
1400 | tree type; | |
1401 | { | |
1402 | enum tree_code code = TREE_CODE (type); | |
1403 | tree t; | |
1404 | ||
1405 | if (code == FUNCTION_TYPE || code == METHOD_TYPE) | |
1406 | return size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
1407 | ||
1408 | if (code == VOID_TYPE || code == ERROR_MARK) | |
1409 | return size_int (1); | |
1410 | ||
1411 | /* C++: this is really correct! */ | |
1412 | if (code == REFERENCE_TYPE) | |
1413 | type = TREE_TYPE (type); | |
1414 | ||
1415 | /* @@ This also produces an error for a signature ref. | |
1416 | In that case we should be able to do better. */ | |
1417 | if (IS_SIGNATURE (type)) | |
1418 | { | |
1419 | error ("`__alignof' applied to a signature type"); | |
1420 | return size_int (1); | |
1421 | } | |
1422 | ||
1423 | t = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
1424 | force_fit_type (t, 0); | |
1425 | return t; | |
1426 | } | |
1427 | \f | |
1428 | /* Perform default promotions for C data used in expressions. | |
1429 | Arrays and functions are converted to pointers; | |
1430 | enumeral types or short or char, to int. | |
1431 | In addition, manifest constants symbols are replaced by their values. | |
1432 | ||
1433 | C++: this will automatically bash references to their target type. */ | |
1434 | ||
1435 | tree | |
a9aedbc2 | 1436 | decay_conversion (exp) |
8d08fdba MS |
1437 | tree exp; |
1438 | { | |
1439 | register tree type = TREE_TYPE (exp); | |
1440 | register enum tree_code code = TREE_CODE (type); | |
1441 | ||
ce122a86 | 1442 | if (code == OFFSET_TYPE) |
8d08fdba MS |
1443 | { |
1444 | if (TREE_CODE (exp) == OFFSET_REF) | |
a9aedbc2 | 1445 | return decay_conversion (resolve_offset_ref (exp)); |
8d08fdba MS |
1446 | |
1447 | type = TREE_TYPE (type); | |
1448 | code = TREE_CODE (type); | |
1449 | } | |
1450 | ||
1451 | if (code == REFERENCE_TYPE) | |
1452 | { | |
1453 | exp = convert_from_reference (exp); | |
1454 | type = TREE_TYPE (exp); | |
1455 | code = TREE_CODE (type); | |
1456 | } | |
1457 | ||
1458 | /* Constants can be used directly unless they're not loadable. */ | |
1459 | if (TREE_CODE (exp) == CONST_DECL) | |
1460 | exp = DECL_INITIAL (exp); | |
1461 | /* Replace a nonvolatile const static variable with its value. */ | |
fd378c9d | 1462 | else if (TREE_READONLY_DECL_P (exp)) |
8d08fdba MS |
1463 | { |
1464 | exp = decl_constant_value (exp); | |
1465 | type = TREE_TYPE (exp); | |
1466 | } | |
1467 | ||
1468 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
1469 | Leave such NOP_EXPRs, since RHS is being used in non-lvalue context. */ | |
1470 | ||
8d08fdba MS |
1471 | if (code == VOID_TYPE) |
1472 | { | |
1473 | error ("void value not ignored as it ought to be"); | |
1474 | return error_mark_node; | |
1475 | } | |
1476 | if (code == FUNCTION_TYPE) | |
1477 | { | |
1478 | return build_unary_op (ADDR_EXPR, exp, 0); | |
1479 | } | |
1480 | if (code == METHOD_TYPE) | |
1481 | { | |
4ac14744 | 1482 | cp_pedwarn ("assuming & on `%E'", exp); |
8d08fdba MS |
1483 | return build_unary_op (ADDR_EXPR, exp, 0); |
1484 | } | |
1485 | if (code == ARRAY_TYPE) | |
1486 | { | |
1487 | register tree adr; | |
1488 | tree restype; | |
1489 | tree ptrtype; | |
1490 | int constp, volatilep; | |
1491 | ||
1492 | if (TREE_CODE (exp) == INDIRECT_REF) | |
1493 | { | |
1494 | /* Stripping away the INDIRECT_REF is not the right | |
1495 | thing to do for references... */ | |
1496 | tree inner = TREE_OPERAND (exp, 0); | |
1497 | if (TREE_CODE (TREE_TYPE (inner)) == REFERENCE_TYPE) | |
1498 | { | |
1499 | inner = build1 (CONVERT_EXPR, | |
1500 | build_pointer_type (TREE_TYPE (TREE_TYPE (inner))), | |
1501 | inner); | |
1502 | TREE_REFERENCE_EXPR (inner) = 1; | |
1503 | } | |
f30432d7 | 1504 | return convert (build_pointer_type (TREE_TYPE (type)), inner); |
8d08fdba MS |
1505 | } |
1506 | ||
1507 | if (TREE_CODE (exp) == COMPOUND_EXPR) | |
1508 | { | |
a9aedbc2 | 1509 | tree op1 = decay_conversion (TREE_OPERAND (exp, 1)); |
8d08fdba MS |
1510 | return build (COMPOUND_EXPR, TREE_TYPE (op1), |
1511 | TREE_OPERAND (exp, 0), op1); | |
1512 | } | |
1513 | ||
1514 | if (!lvalue_p (exp) | |
1515 | && ! (TREE_CODE (exp) == CONSTRUCTOR && TREE_STATIC (exp))) | |
1516 | { | |
1517 | error ("invalid use of non-lvalue array"); | |
1518 | return error_mark_node; | |
1519 | } | |
1520 | ||
1521 | constp = volatilep = 0; | |
1522 | if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'r' | |
1523 | || TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
1524 | { | |
1525 | constp = TREE_READONLY (exp); | |
1526 | volatilep = TREE_THIS_VOLATILE (exp); | |
1527 | } | |
1528 | ||
1529 | restype = TREE_TYPE (type); | |
1530 | if (TYPE_READONLY (type) || TYPE_VOLATILE (type) | |
1531 | || constp || volatilep) | |
f376e137 | 1532 | restype = cp_build_type_variant (restype, |
21474714 MS |
1533 | TYPE_READONLY (type) || constp, |
1534 | TYPE_VOLATILE (type) || volatilep); | |
8d08fdba MS |
1535 | ptrtype = build_pointer_type (restype); |
1536 | ||
1537 | if (TREE_CODE (exp) == VAR_DECL) | |
1538 | { | |
1539 | /* ??? This is not really quite correct | |
1540 | in that the type of the operand of ADDR_EXPR | |
1541 | is not the target type of the type of the ADDR_EXPR itself. | |
1542 | Question is, can this lossage be avoided? */ | |
1543 | adr = build1 (ADDR_EXPR, ptrtype, exp); | |
1544 | if (mark_addressable (exp) == 0) | |
1545 | return error_mark_node; | |
1546 | TREE_CONSTANT (adr) = staticp (exp); | |
1547 | TREE_SIDE_EFFECTS (adr) = 0; /* Default would be, same as EXP. */ | |
1548 | return adr; | |
1549 | } | |
1550 | /* This way is better for a COMPONENT_REF since it can | |
1551 | simplify the offset for a component. */ | |
1552 | adr = build_unary_op (ADDR_EXPR, exp, 1); | |
1553 | return convert (ptrtype, adr); | |
1554 | } | |
a9aedbc2 MS |
1555 | |
1556 | return exp; | |
1557 | } | |
1558 | ||
1559 | tree | |
1560 | default_conversion (exp) | |
1561 | tree exp; | |
1562 | { | |
1563 | tree type; | |
1564 | enum tree_code code; | |
1565 | ||
1566 | exp = decay_conversion (exp); | |
1567 | ||
1568 | type = TREE_TYPE (exp); | |
1569 | code = TREE_CODE (type); | |
1570 | ||
1571 | if (INTEGRAL_CODE_P (code)) | |
1572 | { | |
1573 | tree t = type_promotes_to (type); | |
1574 | if (t != type) | |
1575 | return convert (t, exp); | |
1576 | } | |
1577 | if (flag_traditional | |
1578 | && TYPE_MAIN_VARIANT (type) == float_type_node) | |
1579 | return convert (double_type_node, exp); | |
1580 | ||
8d08fdba MS |
1581 | return exp; |
1582 | } | |
6b5fbb55 MS |
1583 | |
1584 | /* Take the address of an inline function without setting TREE_ADDRESSABLE | |
1585 | or TREE_USED. */ | |
1586 | ||
1587 | tree | |
1588 | inline_conversion (exp) | |
1589 | tree exp; | |
1590 | { | |
1591 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
1592 | { | |
1593 | tree type = build_type_variant | |
1594 | (TREE_TYPE (exp), TREE_READONLY (exp), TREE_THIS_VOLATILE (exp)); | |
1595 | exp = build1 (ADDR_EXPR, build_pointer_type (type), exp); | |
1596 | } | |
1597 | return exp; | |
1598 | } | |
8d08fdba MS |
1599 | \f |
1600 | tree | |
1601 | build_object_ref (datum, basetype, field) | |
1602 | tree datum, basetype, field; | |
1603 | { | |
a292b002 | 1604 | tree dtype; |
8d08fdba MS |
1605 | if (datum == error_mark_node) |
1606 | return error_mark_node; | |
a292b002 MS |
1607 | |
1608 | dtype = TREE_TYPE (datum); | |
1609 | if (TREE_CODE (dtype) == REFERENCE_TYPE) | |
1610 | dtype = TREE_TYPE (dtype); | |
1611 | if (! IS_AGGR_TYPE_CODE (TREE_CODE (dtype))) | |
1612 | { | |
1613 | cp_error ("request for member `%T::%D' in expression of non-aggregate type `%T'", | |
1614 | basetype, field, dtype); | |
1615 | return error_mark_node; | |
1616 | } | |
be99da77 | 1617 | else if (IS_SIGNATURE (basetype)) |
8d08fdba MS |
1618 | { |
1619 | warning ("signature name in scope resolution ignored"); | |
1620 | return build_component_ref (datum, field, NULL_TREE, 1); | |
1621 | } | |
be99da77 | 1622 | else if (is_aggr_type (basetype, 1)) |
8d08fdba | 1623 | { |
45537677 | 1624 | tree binfo = binfo_or_else (basetype, dtype); |
a4443a08 | 1625 | if (binfo) |
8d08fdba | 1626 | return build_component_ref (build_scoped_ref (datum, basetype), |
a4443a08 | 1627 | field, binfo, 1); |
8d08fdba MS |
1628 | } |
1629 | return error_mark_node; | |
1630 | } | |
1631 | ||
1632 | /* Like `build_component_ref, but uses an already found field. | |
4ac14744 | 1633 | Must compute access for current_class_ref. Otherwise, ok. */ |
e92cc029 | 1634 | |
8d08fdba MS |
1635 | tree |
1636 | build_component_ref_1 (datum, field, protect) | |
1637 | tree datum, field; | |
1638 | int protect; | |
1639 | { | |
6467930b | 1640 | return build_component_ref (datum, field, NULL_TREE, protect); |
8d08fdba MS |
1641 | } |
1642 | ||
1643 | /* Given a COND_EXPR in T, return it in a form that we can, for | |
1644 | example, use as an lvalue. This code used to be in unary_complex_lvalue, | |
1645 | but we needed it to deal with `a = (d == c) ? b : c' expressions, where | |
1646 | we're dealing with aggregates. So, we now call this in unary_complex_lvalue, | |
1647 | and in build_modify_expr. The case (in particular) that led to this was | |
1648 | with CODE == ADDR_EXPR, since it's not an lvalue when we'd get it there. */ | |
e92cc029 | 1649 | |
8d08fdba MS |
1650 | static tree |
1651 | rationalize_conditional_expr (code, t) | |
1652 | enum tree_code code; | |
1653 | tree t; | |
1654 | { | |
1655 | return | |
1656 | build_conditional_expr (TREE_OPERAND (t, 0), | |
1657 | build_unary_op (code, TREE_OPERAND (t, 1), 0), | |
1658 | build_unary_op (code, TREE_OPERAND (t, 2), 0)); | |
1659 | } | |
1660 | ||
9e9ff709 MS |
1661 | /* Given the TYPE of an anonymous union field inside T, return the |
1662 | FIELD_DECL for the field. If not found return NULL_TREE. Because | |
1663 | anonymous unions can nest, we must also search all anonymous unions | |
1664 | that are directly reachable. */ | |
e92cc029 | 1665 | |
9e9ff709 MS |
1666 | static tree |
1667 | lookup_anon_field (t, type) | |
1668 | tree t, type; | |
1669 | { | |
1670 | tree field; | |
1671 | ||
1672 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
1673 | { | |
1674 | if (TREE_STATIC (field)) | |
1675 | continue; | |
1676 | if (TREE_CODE (field) != FIELD_DECL) | |
1677 | continue; | |
1678 | ||
1679 | /* If we find it directly, return the field. */ | |
1680 | if (DECL_NAME (field) == NULL_TREE | |
1681 | && type == TREE_TYPE (field)) | |
1682 | { | |
1683 | return field; | |
1684 | } | |
1685 | ||
1686 | /* Otherwise, it could be nested, search harder. */ | |
1687 | if (DECL_NAME (field) == NULL_TREE | |
1688 | && TREE_CODE (TREE_TYPE (field)) == UNION_TYPE) | |
1689 | { | |
1690 | tree subfield = lookup_anon_field (TREE_TYPE (field), type); | |
1691 | if (subfield) | |
1692 | return subfield; | |
1693 | } | |
1694 | } | |
1695 | return NULL_TREE; | |
1696 | } | |
1697 | ||
1698 | /* Build a COMPONENT_REF for a given DATUM, and it's member COMPONENT. | |
1699 | COMPONENT can be an IDENTIFIER_NODE that is the name of the member | |
1700 | that we are interested in, or it can be a FIELD_DECL. */ | |
e92cc029 | 1701 | |
8d08fdba MS |
1702 | tree |
1703 | build_component_ref (datum, component, basetype_path, protect) | |
1704 | tree datum, component, basetype_path; | |
1705 | int protect; | |
1706 | { | |
1707 | register tree basetype = TREE_TYPE (datum); | |
5566b478 | 1708 | register enum tree_code code; |
8d08fdba MS |
1709 | register tree field = NULL; |
1710 | register tree ref; | |
1711 | ||
5566b478 MS |
1712 | if (current_template_parms) |
1713 | return build_min_nt (COMPONENT_REF, datum, component); | |
1714 | ||
e92cc029 MS |
1715 | /* If DATUM is a COMPOUND_EXPR or COND_EXPR, move our reference |
1716 | inside it. */ | |
8d08fdba MS |
1717 | switch (TREE_CODE (datum)) |
1718 | { | |
1719 | case COMPOUND_EXPR: | |
1720 | { | |
1721 | tree value = build_component_ref (TREE_OPERAND (datum, 1), component, | |
1722 | basetype_path, protect); | |
1723 | return build (COMPOUND_EXPR, TREE_TYPE (value), | |
1724 | TREE_OPERAND (datum, 0), value); | |
1725 | } | |
1726 | case COND_EXPR: | |
1727 | return build_conditional_expr | |
1728 | (TREE_OPERAND (datum, 0), | |
1729 | build_component_ref (TREE_OPERAND (datum, 1), component, | |
1730 | basetype_path, protect), | |
1731 | build_component_ref (TREE_OPERAND (datum, 2), component, | |
1732 | basetype_path, protect)); | |
1733 | } | |
1734 | ||
5566b478 MS |
1735 | code = TREE_CODE (basetype); |
1736 | ||
8d08fdba MS |
1737 | if (code == REFERENCE_TYPE) |
1738 | { | |
9e9ff709 | 1739 | datum = convert_from_reference (datum); |
8d08fdba MS |
1740 | basetype = TREE_TYPE (datum); |
1741 | code = TREE_CODE (basetype); | |
1742 | } | |
fc378698 MS |
1743 | if (TREE_CODE (datum) == OFFSET_REF) |
1744 | { | |
1745 | datum = resolve_offset_ref (datum); | |
1746 | basetype = TREE_TYPE (datum); | |
1747 | code = TREE_CODE (basetype); | |
1748 | } | |
8d08fdba | 1749 | |
e92cc029 | 1750 | /* First, see if there is a field or component with name COMPONENT. */ |
8d08fdba MS |
1751 | if (TREE_CODE (component) == TREE_LIST) |
1752 | { | |
1753 | my_friendly_assert (!(TREE_CHAIN (component) == NULL_TREE | |
1754 | && DECL_CHAIN (TREE_VALUE (component)) == NULL_TREE), 309); | |
1755 | return build (COMPONENT_REF, TREE_TYPE (component), datum, component); | |
1756 | } | |
8d08fdba MS |
1757 | |
1758 | if (! IS_AGGR_TYPE_CODE (code)) | |
1759 | { | |
1760 | if (code != ERROR_MARK) | |
1761 | cp_error ("request for member `%D' in `%E', which is of non-aggregate type `%T'", | |
1762 | component, datum, basetype); | |
1763 | return error_mark_node; | |
1764 | } | |
1765 | ||
5566b478 | 1766 | if (TYPE_SIZE (complete_type (basetype)) == 0) |
8d08fdba MS |
1767 | { |
1768 | incomplete_type_error (0, basetype); | |
1769 | return error_mark_node; | |
1770 | } | |
1771 | ||
1772 | if (TREE_CODE (component) == BIT_NOT_EXPR) | |
1773 | { | |
1774 | if (TYPE_IDENTIFIER (basetype) != TREE_OPERAND (component, 0)) | |
1775 | { | |
1776 | cp_error ("destructor specifier `%T::~%T' must have matching names", | |
1777 | basetype, TREE_OPERAND (component, 0)); | |
1778 | return error_mark_node; | |
1779 | } | |
1780 | if (! TYPE_HAS_DESTRUCTOR (basetype)) | |
1781 | { | |
1782 | cp_error ("type `%T' has no destructor", basetype); | |
1783 | return error_mark_node; | |
1784 | } | |
fc378698 | 1785 | return TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 1); |
8d08fdba MS |
1786 | } |
1787 | ||
1788 | /* Look up component name in the structure type definition. */ | |
1789 | if (CLASSTYPE_VFIELD (basetype) | |
1790 | && DECL_NAME (CLASSTYPE_VFIELD (basetype)) == component) | |
1791 | /* Special-case this because if we use normal lookups in an ambiguous | |
1792 | hierarchy, the compiler will abort (because vptr lookups are | |
1793 | not supposed to be ambiguous. */ | |
1794 | field = CLASSTYPE_VFIELD (basetype); | |
d11ad92e MS |
1795 | else if (TREE_CODE (component) == FIELD_DECL |
1796 | || TREE_CODE (component) == TYPE_DECL) | |
9e9ff709 MS |
1797 | { |
1798 | field = component; | |
1799 | } | |
8d08fdba MS |
1800 | else |
1801 | { | |
1802 | if (basetype_path == NULL_TREE) | |
1803 | basetype_path = TYPE_BINFO (basetype); | |
1804 | field = lookup_field (basetype_path, component, | |
1805 | protect && ! VFIELD_NAME_P (component), 0); | |
1806 | if (field == error_mark_node) | |
1807 | return error_mark_node; | |
1808 | ||
1809 | if (field == NULL_TREE) | |
1810 | { | |
1811 | /* Not found as a data field, look for it as a method. If found, | |
1812 | then if this is the only possible one, return it, else | |
1813 | report ambiguity error. */ | |
1814 | tree fndecls = lookup_fnfields (basetype_path, component, 1); | |
1815 | if (fndecls == error_mark_node) | |
1816 | return error_mark_node; | |
1817 | if (fndecls) | |
1818 | { | |
1819 | if (TREE_CHAIN (fndecls) == NULL_TREE | |
1820 | && DECL_CHAIN (TREE_VALUE (fndecls)) == NULL_TREE) | |
1821 | { | |
be99da77 | 1822 | tree access, fndecl; |
8d08fdba MS |
1823 | |
1824 | /* Unique, so use this one now. */ | |
1825 | basetype = TREE_PURPOSE (fndecls); | |
1826 | fndecl = TREE_VALUE (fndecls); | |
1827 | access = compute_access (TREE_PURPOSE (fndecls), fndecl); | |
be99da77 | 1828 | if (access == access_public_node) |
8d08fdba MS |
1829 | { |
1830 | if (DECL_VINDEX (fndecl) | |
1831 | && ! resolves_to_fixed_type_p (datum, 0)) | |
1832 | { | |
1833 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
1834 | addr = convert_pointer_to (DECL_CONTEXT (fndecl), addr); | |
1835 | datum = build_indirect_ref (addr, NULL_PTR); | |
1836 | my_friendly_assert (datum != error_mark_node, 310); | |
1837 | fndecl = build_vfn_ref (&addr, datum, DECL_VINDEX (fndecl)); | |
1838 | } | |
72b7eeff | 1839 | mark_used (fndecl); |
594740f3 | 1840 | return build (OFFSET_REF, TREE_TYPE (fndecl), datum, fndecl); |
8d08fdba | 1841 | } |
be99da77 | 1842 | if (access == access_protected_node) |
8d08fdba MS |
1843 | cp_error ("member function `%D' is protected", fndecl); |
1844 | else | |
1845 | cp_error ("member function `%D' is private", fndecl); | |
1846 | return error_mark_node; | |
1847 | } | |
1848 | else | |
e1cd6e56 MS |
1849 | { |
1850 | /* Just act like build_offset_ref, since the object does | |
1851 | not matter unless we're actually calling the function. */ | |
28cbf42c MS |
1852 | tree t; |
1853 | ||
28cbf42c | 1854 | t = build_tree_list (error_mark_node, fndecls); |
e1cd6e56 MS |
1855 | TREE_TYPE (t) = build_offset_type (basetype, |
1856 | unknown_type_node); | |
1857 | return t; | |
1858 | } | |
8d08fdba MS |
1859 | } |
1860 | ||
9e9ff709 | 1861 | cp_error ("`%#T' has no member named `%D'", basetype, component); |
8d08fdba MS |
1862 | return error_mark_node; |
1863 | } | |
1864 | else if (TREE_TYPE (field) == error_mark_node) | |
1865 | return error_mark_node; | |
1866 | ||
1867 | if (TREE_CODE (field) != FIELD_DECL) | |
1868 | { | |
1869 | if (TREE_CODE (field) == TYPE_DECL) | |
1870 | { | |
1871 | cp_error ("invalid use of type decl `%#D' as expression", field); | |
1872 | return error_mark_node; | |
1873 | } | |
72b7eeff MS |
1874 | else if (DECL_RTL (field) != 0) |
1875 | mark_used (field); | |
1876 | else | |
1877 | TREE_USED (field) = 1; | |
8d08fdba MS |
1878 | return field; |
1879 | } | |
1880 | } | |
1881 | ||
2ee887f2 MS |
1882 | /* See if we have to do any conversions so that we pick up the field from the |
1883 | right context. */ | |
9e9ff709 MS |
1884 | if (DECL_FIELD_CONTEXT (field) != basetype) |
1885 | { | |
1886 | tree context = DECL_FIELD_CONTEXT (field); | |
2ee887f2 | 1887 | tree base = context; |
fc378698 MS |
1888 | while (base != basetype && TYPE_NAME (base) |
1889 | && ANON_AGGRNAME_P (TYPE_IDENTIFIER (base))) | |
2ee887f2 MS |
1890 | { |
1891 | base = TYPE_CONTEXT (base); | |
1892 | } | |
1893 | ||
1894 | /* Handle base classes here... */ | |
1895 | if (base != basetype && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
1896 | { | |
1897 | tree addr = build_unary_op (ADDR_EXPR, datum, 0); | |
1898 | if (integer_zerop (addr)) | |
1899 | { | |
1900 | error ("invalid reference to NULL ptr, use ptr-to-member instead"); | |
1901 | return error_mark_node; | |
1902 | } | |
1903 | if (VBASE_NAME_P (DECL_NAME (field))) | |
1904 | { | |
1905 | /* It doesn't matter which vbase pointer we grab, just | |
1906 | find one of them. */ | |
1907 | tree binfo = get_binfo (base, | |
1908 | TREE_TYPE (TREE_TYPE (addr)), 0); | |
1909 | addr = convert_pointer_to_real (binfo, addr); | |
1910 | } | |
1911 | else | |
1912 | addr = convert_pointer_to (base, addr); | |
1913 | datum = build_indirect_ref (addr, NULL_PTR); | |
1914 | my_friendly_assert (datum != error_mark_node, 311); | |
1915 | } | |
1916 | basetype = base; | |
1917 | ||
1918 | /* Handle things from anon unions here... */ | |
fc378698 | 1919 | if (TYPE_NAME (context) && ANON_AGGRNAME_P (TYPE_IDENTIFIER (context))) |
9e9ff709 MS |
1920 | { |
1921 | tree subfield = lookup_anon_field (basetype, context); | |
1922 | tree subdatum = build_component_ref (datum, subfield, | |
1923 | basetype_path, protect); | |
1924 | return build_component_ref (subdatum, field, basetype_path, protect); | |
1925 | } | |
1926 | } | |
1927 | ||
f376e137 MS |
1928 | ref = fold (build (COMPONENT_REF, TREE_TYPE (field), |
1929 | break_out_cleanups (datum), field)); | |
8d08fdba MS |
1930 | |
1931 | if (TREE_READONLY (datum) || TREE_READONLY (field)) | |
1932 | TREE_READONLY (ref) = 1; | |
1933 | if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field)) | |
1934 | TREE_THIS_VOLATILE (ref) = 1; | |
1935 | if (DECL_MUTABLE_P (field)) | |
1936 | TREE_READONLY (ref) = 0; | |
1937 | ||
1938 | return ref; | |
1939 | } | |
1940 | \f | |
1941 | /* Given an expression PTR for a pointer, return an expression | |
1942 | for the value pointed to. | |
1943 | ERRORSTRING is the name of the operator to appear in error messages. | |
1944 | ||
1945 | This function may need to overload OPERATOR_FNNAME. | |
1946 | Must also handle REFERENCE_TYPEs for C++. */ | |
1947 | ||
1948 | tree | |
1949 | build_x_indirect_ref (ptr, errorstring) | |
1950 | tree ptr; | |
1951 | char *errorstring; | |
1952 | { | |
5566b478 MS |
1953 | tree rval; |
1954 | ||
1955 | if (current_template_parms) | |
1956 | return build_min_nt (INDIRECT_REF, ptr); | |
1957 | ||
1958 | rval = build_opfncall (INDIRECT_REF, LOOKUP_NORMAL, ptr, NULL_TREE, NULL_TREE); | |
8d08fdba MS |
1959 | if (rval) |
1960 | return rval; | |
1961 | return build_indirect_ref (ptr, errorstring); | |
1962 | } | |
1963 | ||
1964 | tree | |
1965 | build_indirect_ref (ptr, errorstring) | |
1966 | tree ptr; | |
1967 | char *errorstring; | |
1968 | { | |
c11b6f21 MS |
1969 | register tree pointer, type; |
1970 | ||
1971 | if (ptr == error_mark_node) | |
1972 | return error_mark_node; | |
1973 | ||
1974 | pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE | |
1975 | ? ptr : default_conversion (ptr)); | |
1976 | type = TREE_TYPE (pointer); | |
8d08fdba | 1977 | |
4ac14744 MS |
1978 | if (ptr == current_class_ptr) |
1979 | return current_class_ref; | |
8d08fdba | 1980 | |
f30432d7 | 1981 | if (IS_AGGR_TYPE (type)) |
28cbf42c | 1982 | { |
f30432d7 MS |
1983 | ptr = build_expr_type_conversion (WANT_POINTER, pointer, 1); |
1984 | ||
1985 | if (ptr) | |
1986 | { | |
1987 | pointer = ptr; | |
1988 | type = TREE_TYPE (pointer); | |
1989 | } | |
28cbf42c MS |
1990 | } |
1991 | ||
8d08fdba MS |
1992 | if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) |
1993 | { | |
1994 | if (TREE_CODE (pointer) == ADDR_EXPR | |
1743ca29 RK |
1995 | && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (pointer, 0))) |
1996 | == TYPE_MAIN_VARIANT (TREE_TYPE (type))) | |
1997 | && (TREE_READONLY (TREE_OPERAND (pointer, 0)) | |
1998 | == TYPE_READONLY (TREE_TYPE (type))) | |
1999 | && (TREE_THIS_VOLATILE (TREE_OPERAND (pointer, 0)) | |
2000 | == TYPE_VOLATILE (TREE_TYPE (type)))) | |
8d08fdba MS |
2001 | return TREE_OPERAND (pointer, 0); |
2002 | else | |
2003 | { | |
2004 | tree t = TREE_TYPE (type); | |
2005 | register tree ref = build1 (INDIRECT_REF, | |
2006 | TYPE_MAIN_VARIANT (t), pointer); | |
2007 | ||
2008 | TREE_READONLY (ref) = TYPE_READONLY (t); | |
2009 | TREE_THIS_VOLATILE (ref) = TYPE_VOLATILE (t); | |
2010 | TREE_SIDE_EFFECTS (ref) | |
2011 | = TYPE_VOLATILE (t) || TREE_SIDE_EFFECTS (pointer); | |
2012 | return ref; | |
2013 | } | |
2014 | } | |
2015 | /* `pointer' won't be an error_mark_node if we were given a | |
2016 | pointer to member, so it's cool to check for this here. */ | |
2017 | else if (TYPE_PTRMEMFUNC_P (type)) | |
2018 | error ("invalid use of `%s' on pointer to member function", errorstring); | |
2019 | else if (TREE_CODE (type) == RECORD_TYPE | |
2020 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
2021 | error ("cannot dereference signature pointer/reference"); | |
2022 | else if (pointer != error_mark_node) | |
2023 | { | |
2024 | if (errorstring) | |
2025 | error ("invalid type argument of `%s'", errorstring); | |
2026 | else | |
2027 | error ("invalid type argument"); | |
2028 | } | |
2029 | return error_mark_node; | |
2030 | } | |
2031 | ||
2032 | /* This handles expressions of the form "a[i]", which denotes | |
2033 | an array reference. | |
2034 | ||
2035 | This is logically equivalent in C to *(a+i), but we may do it differently. | |
2036 | If A is a variable or a member, we generate a primitive ARRAY_REF. | |
2037 | This avoids forcing the array out of registers, and can work on | |
2038 | arrays that are not lvalues (for example, members of structures returned | |
2039 | by functions). | |
2040 | ||
2041 | If INDEX is of some user-defined type, it must be converted to | |
2042 | integer type. Otherwise, to make a compatible PLUS_EXPR, it | |
2043 | will inherit the type of the array, which will be some pointer type. */ | |
2044 | ||
2045 | tree | |
e92cc029 MS |
2046 | build_x_array_ref (array, idx) |
2047 | tree array, idx; | |
8d08fdba | 2048 | { |
e92cc029 | 2049 | tree rval = build_opfncall (ARRAY_REF, LOOKUP_NORMAL, array, idx, NULL_TREE); |
8d08fdba MS |
2050 | if (rval) |
2051 | return rval; | |
e92cc029 | 2052 | return build_array_ref (array, idx); |
8d08fdba MS |
2053 | } |
2054 | ||
2055 | tree | |
2056 | build_array_ref (array, idx) | |
2057 | tree array, idx; | |
2058 | { | |
8d08fdba MS |
2059 | if (idx == 0) |
2060 | { | |
2061 | error ("subscript missing in array reference"); | |
2062 | return error_mark_node; | |
2063 | } | |
2064 | ||
2065 | if (TREE_TYPE (array) == error_mark_node | |
2066 | || TREE_TYPE (idx) == error_mark_node) | |
2067 | return error_mark_node; | |
2068 | ||
8d08fdba MS |
2069 | if (TREE_CODE (TREE_TYPE (array)) == ARRAY_TYPE |
2070 | && TREE_CODE (array) != INDIRECT_REF) | |
2071 | { | |
2072 | tree rval, type; | |
2073 | ||
2074 | /* Subscripting with type char is likely to lose | |
2075 | on a machine where chars are signed. | |
2076 | So warn on any machine, but optionally. | |
2077 | Don't warn for unsigned char since that type is safe. | |
2078 | Don't warn for signed char because anyone who uses that | |
2079 | must have done so deliberately. */ | |
2080 | if (warn_char_subscripts | |
2081 | && TYPE_MAIN_VARIANT (TREE_TYPE (idx)) == char_type_node) | |
2082 | warning ("array subscript has type `char'"); | |
2083 | ||
2084 | /* Apply default promotions *after* noticing character types. */ | |
2085 | idx = default_conversion (idx); | |
2086 | ||
2087 | if (TREE_CODE (TREE_TYPE (idx)) != INTEGER_TYPE) | |
2088 | { | |
2089 | error ("array subscript is not an integer"); | |
2090 | return error_mark_node; | |
2091 | } | |
2092 | ||
2093 | /* An array that is indexed by a non-constant | |
2094 | cannot be stored in a register; we must be able to do | |
2095 | address arithmetic on its address. | |
2096 | Likewise an array of elements of variable size. */ | |
2097 | if (TREE_CODE (idx) != INTEGER_CST | |
2098 | || (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array))) != 0 | |
2099 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (array)))) != INTEGER_CST)) | |
2100 | { | |
2101 | if (mark_addressable (array) == 0) | |
2102 | return error_mark_node; | |
2103 | } | |
2104 | /* An array that is indexed by a constant value which is not within | |
2105 | the array bounds cannot be stored in a register either; because we | |
2106 | would get a crash in store_bit_field/extract_bit_field when trying | |
2107 | to access a non-existent part of the register. */ | |
2108 | if (TREE_CODE (idx) == INTEGER_CST | |
2109 | && TYPE_VALUES (TREE_TYPE (array)) | |
2110 | && ! int_fits_type_p (idx, TYPE_VALUES (TREE_TYPE (array)))) | |
2111 | { | |
2112 | if (mark_addressable (array) == 0) | |
2113 | return error_mark_node; | |
2114 | } | |
2115 | ||
8d08fdba MS |
2116 | if (pedantic && !lvalue_p (array)) |
2117 | pedwarn ("ANSI C++ forbids subscripting non-lvalue array"); | |
2118 | ||
b7484fbe MS |
2119 | /* Note in C++ it is valid to subscript a `register' array, since |
2120 | it is valid to take the address of something with that | |
2121 | storage specification. */ | |
2122 | if (extra_warnings) | |
8d08fdba MS |
2123 | { |
2124 | tree foo = array; | |
2125 | while (TREE_CODE (foo) == COMPONENT_REF) | |
2126 | foo = TREE_OPERAND (foo, 0); | |
2127 | if (TREE_CODE (foo) == VAR_DECL && DECL_REGISTER (foo)) | |
b7484fbe | 2128 | warning ("subscripting array declared `register'"); |
8d08fdba MS |
2129 | } |
2130 | ||
2131 | type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (array))); | |
2132 | rval = build (ARRAY_REF, type, array, idx); | |
2133 | /* Array ref is const/volatile if the array elements are | |
2134 | or if the array is.. */ | |
2135 | TREE_READONLY (rval) | |
2136 | |= (TYPE_READONLY (TREE_TYPE (TREE_TYPE (array))) | |
2137 | | TREE_READONLY (array)); | |
2138 | TREE_SIDE_EFFECTS (rval) | |
2139 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2140 | | TREE_SIDE_EFFECTS (array)); | |
2141 | TREE_THIS_VOLATILE (rval) | |
2142 | |= (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (array))) | |
2143 | /* This was added by rms on 16 Nov 91. | |
2144 | It fixes vol struct foo *a; a->elts[1] | |
2145 | in an inline function. | |
2146 | Hope it doesn't break something else. */ | |
2147 | | TREE_THIS_VOLATILE (array)); | |
2148 | return require_complete_type (fold (rval)); | |
2149 | } | |
2150 | ||
2151 | { | |
2152 | tree ar = default_conversion (array); | |
2153 | tree ind = default_conversion (idx); | |
2154 | ||
2155 | /* Put the integer in IND to simplify error checking. */ | |
2156 | if (TREE_CODE (TREE_TYPE (ar)) == INTEGER_TYPE) | |
2157 | { | |
2158 | tree temp = ar; | |
2159 | ar = ind; | |
2160 | ind = temp; | |
2161 | } | |
2162 | ||
2163 | if (ar == error_mark_node) | |
2164 | return ar; | |
2165 | ||
2166 | if (TREE_CODE (TREE_TYPE (ar)) != POINTER_TYPE) | |
2167 | { | |
2168 | error ("subscripted value is neither array nor pointer"); | |
2169 | return error_mark_node; | |
2170 | } | |
2171 | if (TREE_CODE (TREE_TYPE (ind)) != INTEGER_TYPE) | |
2172 | { | |
2173 | error ("array subscript is not an integer"); | |
2174 | return error_mark_node; | |
2175 | } | |
2176 | ||
2177 | return build_indirect_ref (build_binary_op_nodefault (PLUS_EXPR, ar, ind, PLUS_EXPR), | |
2178 | "array indexing"); | |
2179 | } | |
2180 | } | |
2181 | \f | |
2182 | /* Build a function call to function FUNCTION with parameters PARAMS. | |
2183 | PARAMS is a list--a chain of TREE_LIST nodes--in which the | |
4ac14744 MS |
2184 | TREE_VALUE of each node is a parameter-expression. The PARAMS do |
2185 | not include any object pointer that may be required. FUNCTION's | |
2186 | data type may be a function type or a pointer-to-function. | |
8d08fdba MS |
2187 | |
2188 | For C++: If FUNCTION's data type is a TREE_LIST, then the tree list | |
2189 | is the list of possible methods that FUNCTION could conceivably | |
2190 | be. If the list of methods comes from a class, then it will be | |
2191 | a list of lists (where each element is associated with the class | |
2192 | that produced it), otherwise it will be a simple list (for | |
2193 | functions overloaded in global scope). | |
2194 | ||
2195 | In the first case, TREE_VALUE (function) is the head of one of those | |
2196 | lists, and TREE_PURPOSE is the name of the function. | |
2197 | ||
2198 | In the second case, TREE_PURPOSE (function) is the function's | |
2199 | name directly. | |
2200 | ||
4ac14744 | 2201 | DECL is the class instance variable, usually CURRENT_CLASS_REF. |
4dabb379 MS |
2202 | |
2203 | When calling a TEMPLATE_DECL, we don't require a complete return | |
2204 | type. */ | |
8d08fdba | 2205 | |
8d08fdba MS |
2206 | tree |
2207 | build_x_function_call (function, params, decl) | |
2208 | tree function, params, decl; | |
2209 | { | |
2210 | tree type; | |
2211 | int is_method; | |
2212 | ||
2213 | if (function == error_mark_node) | |
2214 | return error_mark_node; | |
2215 | ||
5566b478 | 2216 | if (current_template_parms) |
4dabb379 | 2217 | return build_min_nt (CALL_EXPR, function, params, NULL_TREE); |
5566b478 | 2218 | |
8d08fdba | 2219 | type = TREE_TYPE (function); |
fc378698 MS |
2220 | |
2221 | if (TREE_CODE (type) == OFFSET_TYPE | |
2222 | && TREE_TYPE (type) == unknown_type_node | |
2223 | && TREE_CODE (function) == TREE_LIST | |
2224 | && TREE_CHAIN (function) == NULL_TREE) | |
2225 | { | |
e92cc029 | 2226 | /* Undo (Foo:bar)()... */ |
fc378698 MS |
2227 | type = TYPE_OFFSET_BASETYPE (type); |
2228 | function = TREE_VALUE (function); | |
2229 | my_friendly_assert (TREE_CODE (function) == TREE_LIST, 999); | |
2230 | my_friendly_assert (TREE_CHAIN (function) == NULL_TREE, 999); | |
2231 | function = TREE_VALUE (function); | |
2232 | my_friendly_assert (TREE_CODE (function) == FUNCTION_DECL, 999); | |
2233 | function = DECL_NAME (function); | |
2234 | return build_method_call (decl, function, params, TYPE_BINFO (type), LOOKUP_NORMAL); | |
2235 | } | |
2236 | ||
8d08fdba MS |
2237 | is_method = ((TREE_CODE (function) == TREE_LIST |
2238 | && current_class_type != NULL_TREE | |
2239 | && IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (function)) == function) | |
2240 | || TREE_CODE (function) == IDENTIFIER_NODE | |
2241 | || TREE_CODE (type) == METHOD_TYPE | |
2242 | || TYPE_PTRMEMFUNC_P (type)); | |
2243 | ||
fc378698 MS |
2244 | if (TREE_CODE (function) == FUNCTION_DECL |
2245 | && DECL_STATIC_FUNCTION_P (function)) | |
2246 | return build_member_call | |
2247 | (DECL_CONTEXT (function), DECL_NAME (function), params); | |
2248 | ||
8d08fdba MS |
2249 | /* Handle methods, friends, and overloaded functions, respectively. */ |
2250 | if (is_method) | |
2251 | { | |
c73964b2 MS |
2252 | tree basetype = NULL_TREE; |
2253 | ||
8d08fdba MS |
2254 | if (TREE_CODE (function) == FUNCTION_DECL) |
2255 | { | |
c73964b2 MS |
2256 | basetype = DECL_CLASS_CONTEXT (function); |
2257 | ||
8d08fdba MS |
2258 | if (DECL_NAME (function)) |
2259 | function = DECL_NAME (function); | |
2260 | else | |
2261 | function = TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)); | |
2262 | } | |
2263 | else if (TREE_CODE (function) == TREE_LIST) | |
2264 | { | |
8d08fdba | 2265 | my_friendly_assert (TREE_CODE (TREE_VALUE (function)) == FUNCTION_DECL, 312); |
c73964b2 | 2266 | basetype = DECL_CLASS_CONTEXT (TREE_VALUE (function)); |
8d08fdba | 2267 | function = TREE_PURPOSE (function); |
8d08fdba MS |
2268 | } |
2269 | else if (TREE_CODE (function) != IDENTIFIER_NODE) | |
2270 | { | |
2271 | if (TREE_CODE (function) == OFFSET_REF) | |
2272 | { | |
2273 | if (TREE_OPERAND (function, 0)) | |
2274 | decl = TREE_OPERAND (function, 0); | |
2275 | } | |
2276 | /* Call via a pointer to member function. */ | |
2277 | if (decl == NULL_TREE) | |
2278 | { | |
2279 | error ("pointer to member function called, but not in class scope"); | |
2280 | return error_mark_node; | |
2281 | } | |
2282 | /* What other type of POINTER_TYPE could this be? */ | |
2283 | if (TREE_CODE (TREE_TYPE (function)) != POINTER_TYPE | |
2284 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (function)) | |
2285 | && TREE_CODE (function) != OFFSET_REF) | |
2286 | function = build (OFFSET_REF, TREE_TYPE (type), NULL_TREE, function); | |
2287 | goto do_x_function; | |
2288 | } | |
2289 | ||
2290 | /* this is an abbreviated method call. | |
2291 | must go through here in case it is a virtual function. | |
2292 | @@ Perhaps this could be optimized. */ | |
2293 | ||
c73964b2 MS |
2294 | if (basetype && (! current_class_type |
2295 | || ! DERIVED_FROM_P (basetype, current_class_type))) | |
2296 | return build_member_call (basetype, function, params); | |
2297 | ||
8d08fdba MS |
2298 | if (decl == NULL_TREE) |
2299 | { | |
2300 | if (current_class_type == NULL_TREE) | |
2301 | { | |
2302 | error ("object missing in call to method `%s'", | |
2303 | IDENTIFIER_POINTER (function)); | |
2304 | return error_mark_node; | |
2305 | } | |
2306 | /* Yow: call from a static member function. */ | |
f30432d7 | 2307 | decl = build1 (NOP_EXPR, build_pointer_type (current_class_type), |
8d08fdba MS |
2308 | error_mark_node); |
2309 | decl = build_indirect_ref (decl, NULL_PTR); | |
2310 | } | |
2311 | ||
2312 | return build_method_call (decl, function, params, | |
2313 | NULL_TREE, LOOKUP_NORMAL); | |
2314 | } | |
2315 | else if (TREE_CODE (function) == COMPONENT_REF | |
2316 | && type == unknown_type_node) | |
2317 | { | |
2318 | /* Should we undo what was done in build_component_ref? */ | |
2319 | if (TREE_CODE (TREE_PURPOSE (TREE_OPERAND (function, 1))) == TREE_VEC) | |
e92cc029 | 2320 | /* Get the name that build_component_ref hid. */ |
8d08fdba MS |
2321 | function = DECL_NAME (TREE_VALUE (TREE_OPERAND (function, 1))); |
2322 | else | |
2323 | function = TREE_PURPOSE (TREE_OPERAND (function, 1)); | |
2324 | return build_method_call (decl, function, params, | |
2325 | NULL_TREE, LOOKUP_NORMAL); | |
2326 | } | |
2327 | else if (TREE_CODE (function) == TREE_LIST) | |
2328 | { | |
2329 | if (TREE_VALUE (function) == NULL_TREE) | |
2330 | { | |
2331 | cp_error ("function `%D' declared overloaded, but no definitions appear with which to resolve it?!?", | |
2332 | TREE_PURPOSE (function)); | |
2333 | return error_mark_node; | |
2334 | } | |
2335 | else | |
2336 | { | |
5b605f68 | 2337 | tree val = TREE_VALUE (function); |
8d08fdba | 2338 | |
c73964b2 MS |
2339 | if (flag_ansi_overloading) |
2340 | return build_new_function_call (function, params, NULL_TREE); | |
2341 | ||
5b605f68 | 2342 | if (TREE_CODE (val) == TEMPLATE_DECL) |
4dabb379 MS |
2343 | return build_overload_call_real |
2344 | (function, params, LOOKUP_COMPLAIN, (struct candidate *)0, 0); | |
5b605f68 | 2345 | else if (DECL_CHAIN (val) != NULL_TREE) |
8d08fdba | 2346 | return build_overload_call |
ce122a86 | 2347 | (function, params, LOOKUP_COMPLAIN); |
5b605f68 MS |
2348 | else |
2349 | my_friendly_abort (360); | |
8d08fdba MS |
2350 | } |
2351 | } | |
2352 | ||
2353 | do_x_function: | |
2354 | if (TREE_CODE (function) == OFFSET_REF) | |
2355 | { | |
2356 | /* If the component is a data element (or a virtual function), we play | |
2357 | games here to make things work. */ | |
2358 | tree decl_addr; | |
2359 | ||
2360 | if (TREE_OPERAND (function, 0)) | |
2361 | decl = TREE_OPERAND (function, 0); | |
2362 | else | |
4ac14744 | 2363 | decl = current_class_ref; |
8d08fdba MS |
2364 | |
2365 | decl_addr = build_unary_op (ADDR_EXPR, decl, 0); | |
b7484fbe | 2366 | function = get_member_function_from_ptrfunc (&decl_addr, |
8d08fdba MS |
2367 | TREE_OPERAND (function, 1)); |
2368 | params = tree_cons (NULL_TREE, decl_addr, params); | |
2369 | return build_function_call (function, params); | |
2370 | } | |
2371 | ||
2372 | type = TREE_TYPE (function); | |
2373 | if (type != error_mark_node) | |
2374 | { | |
2375 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
2376 | type = TREE_TYPE (type); | |
2377 | ||
6467930b | 2378 | if (IS_AGGR_TYPE (type)) |
8d08fdba MS |
2379 | return build_opfncall (CALL_EXPR, LOOKUP_NORMAL, function, params, NULL_TREE); |
2380 | } | |
2381 | ||
2382 | if (is_method) | |
2383 | { | |
2384 | tree fntype = TREE_TYPE (function); | |
2385 | tree ctypeptr; | |
2386 | ||
2387 | /* Explicitly named method? */ | |
2388 | if (TREE_CODE (function) == FUNCTION_DECL) | |
f30432d7 | 2389 | ctypeptr = build_pointer_type (DECL_CLASS_CONTEXT (function)); |
8d08fdba MS |
2390 | /* Expression with ptr-to-method type? It could either be a plain |
2391 | usage, or it might be a case where the ptr-to-method is being | |
2392 | passed in as an argument. */ | |
2393 | else if (TYPE_PTRMEMFUNC_P (fntype)) | |
2394 | { | |
2395 | tree rec = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (fntype))); | |
f30432d7 | 2396 | ctypeptr = build_pointer_type (rec); |
8d08fdba MS |
2397 | } |
2398 | /* Unexpected node type? */ | |
2399 | else | |
2400 | my_friendly_abort (116); | |
2401 | if (decl == NULL_TREE) | |
2402 | { | |
2403 | if (current_function_decl | |
2404 | && DECL_STATIC_FUNCTION_P (current_function_decl)) | |
2405 | error ("invalid call to member function needing `this' in static member function scope"); | |
2406 | else | |
2407 | error ("pointer to member function called, but not in class scope"); | |
2408 | return error_mark_node; | |
2409 | } | |
2410 | if (TREE_CODE (TREE_TYPE (decl)) != POINTER_TYPE | |
2411 | && ! TYPE_PTRMEMFUNC_P (TREE_TYPE (decl))) | |
2412 | { | |
2413 | decl = build_unary_op (ADDR_EXPR, decl, 0); | |
2414 | decl = convert_pointer_to (TREE_TYPE (ctypeptr), decl); | |
2415 | } | |
2416 | else | |
6060a796 | 2417 | decl = build_c_cast (ctypeptr, decl, 0); |
8d08fdba MS |
2418 | params = tree_cons (NULL_TREE, decl, params); |
2419 | } | |
2420 | ||
2421 | return build_function_call (function, params); | |
2422 | } | |
2423 | ||
2424 | /* Resolve a pointer to member function. INSTANCE is the object | |
2425 | instance to use, if the member points to a virtual member. */ | |
2426 | ||
2427 | tree | |
b7484fbe | 2428 | get_member_function_from_ptrfunc (instance_ptrptr, function) |
8d08fdba | 2429 | tree *instance_ptrptr; |
8d08fdba MS |
2430 | tree function; |
2431 | { | |
2432 | if (TREE_CODE (function) == OFFSET_REF) | |
2433 | { | |
2434 | function = TREE_OPERAND (function, 1); | |
2435 | } | |
2436 | ||
2437 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (function))) | |
2438 | { | |
e92cc029 | 2439 | tree fntype, idx, e1, delta, delta2, e2, e3, aref, vtbl; |
b7484fbe | 2440 | tree instance; |
f30432d7 | 2441 | |
b7484fbe MS |
2442 | tree instance_ptr = *instance_ptrptr; |
2443 | ||
2444 | if (TREE_SIDE_EFFECTS (instance_ptr)) | |
2445 | instance_ptr = save_expr (instance_ptr); | |
2446 | ||
f30432d7 MS |
2447 | if (TREE_SIDE_EFFECTS (function)) |
2448 | function = save_expr (function); | |
2449 | ||
2450 | fntype = TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (function)); | |
e92cc029 MS |
2451 | idx = save_expr (build_component_ref (function, |
2452 | index_identifier, | |
2453 | NULL_TREE, 0)); | |
2454 | e1 = build (GT_EXPR, boolean_type_node, idx, | |
f30432d7 MS |
2455 | convert (delta_type_node, integer_zero_node)); |
2456 | delta = convert (ptrdiff_type_node, | |
4dabb379 | 2457 | build_component_ref (function, delta_identifier, NULL_TREE, 0)); |
f30432d7 MS |
2458 | delta2 = DELTA2_FROM_PTRMEMFUNC (function); |
2459 | ||
e92cc029 | 2460 | /* convert down to the right base, before using the instance. */ |
b7484fbe MS |
2461 | instance |
2462 | = convert_pointer_to_real (TYPE_METHOD_BASETYPE (TREE_TYPE (fntype)), | |
2463 | instance_ptr); | |
51c184be MS |
2464 | if (instance == error_mark_node) |
2465 | return instance; | |
2466 | ||
2467 | vtbl = convert_pointer_to (ptr_type_node, instance); | |
700f8a87 MS |
2468 | vtbl |
2469 | = build (PLUS_EXPR, | |
2470 | build_pointer_type (build_pointer_type (vtable_entry_type)), | |
e1cd6e56 | 2471 | vtbl, convert (ptrdiff_type_node, delta2)); |
8d08fdba | 2472 | vtbl = build_indirect_ref (vtbl, NULL_PTR); |
e1cd6e56 | 2473 | aref = build_array_ref (vtbl, build_binary_op (MINUS_EXPR, |
e92cc029 | 2474 | idx, |
e1cd6e56 | 2475 | integer_one_node, 1)); |
700f8a87 MS |
2476 | if (! flag_vtable_thunks) |
2477 | { | |
2478 | aref = save_expr (aref); | |
8d08fdba | 2479 | |
e1cd6e56 | 2480 | delta = build_binary_op (PLUS_EXPR, |
4dabb379 | 2481 | build_conditional_expr (e1, build_component_ref (aref, delta_identifier, NULL_TREE, 0), integer_zero_node), |
e1cd6e56 | 2482 | delta, 1); |
700f8a87 | 2483 | } |
8d08fdba | 2484 | |
b7484fbe MS |
2485 | *instance_ptrptr = build (PLUS_EXPR, TREE_TYPE (instance_ptr), |
2486 | instance_ptr, delta); | |
700f8a87 MS |
2487 | if (flag_vtable_thunks) |
2488 | e2 = aref; | |
2489 | else | |
4dabb379 | 2490 | e2 = build_component_ref (aref, pfn_identifier, NULL_TREE, 0); |
8d08fdba MS |
2491 | |
2492 | e3 = PFN_FROM_PTRMEMFUNC (function); | |
2493 | TREE_TYPE (e2) = TREE_TYPE (e3); | |
2494 | function = build_conditional_expr (e1, e2, e3); | |
b7484fbe MS |
2495 | |
2496 | /* Make sure this doesn't get evaluated first inside one of the | |
2497 | branches of the COND_EXPR. */ | |
2498 | if (TREE_CODE (instance_ptr) == SAVE_EXPR) | |
2499 | function = build (COMPOUND_EXPR, TREE_TYPE (function), | |
2500 | instance_ptr, function); | |
8d08fdba MS |
2501 | } |
2502 | return function; | |
2503 | } | |
2504 | ||
2505 | tree | |
2506 | build_function_call_real (function, params, require_complete, flags) | |
2507 | tree function, params; | |
2508 | int require_complete, flags; | |
2509 | { | |
2510 | register tree fntype, fndecl; | |
2511 | register tree value_type; | |
2512 | register tree coerced_params; | |
2513 | tree name = NULL_TREE, assembler_name = NULL_TREE; | |
2514 | int is_method; | |
2515 | ||
2516 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
2517 | Strip such NOP_EXPRs, since FUNCTION is used in non-lvalue context. */ | |
2518 | if (TREE_CODE (function) == NOP_EXPR | |
2519 | && TREE_TYPE (function) == TREE_TYPE (TREE_OPERAND (function, 0))) | |
2520 | function = TREE_OPERAND (function, 0); | |
2521 | ||
2522 | if (TREE_CODE (function) == FUNCTION_DECL) | |
2523 | { | |
2524 | name = DECL_NAME (function); | |
2525 | assembler_name = DECL_ASSEMBLER_NAME (function); | |
2526 | ||
2527 | GNU_xref_call (current_function_decl, | |
2528 | IDENTIFIER_POINTER (name ? name | |
2529 | : TYPE_IDENTIFIER (DECL_CLASS_CONTEXT (function)))); | |
72b7eeff | 2530 | mark_used (function); |
8d08fdba MS |
2531 | fndecl = function; |
2532 | ||
2533 | /* Convert anything with function type to a pointer-to-function. */ | |
2534 | if (pedantic | |
2535 | && name | |
2536 | && IDENTIFIER_LENGTH (name) == 4 | |
2537 | && ! strcmp (IDENTIFIER_POINTER (name), "main") | |
2538 | && DECL_CONTEXT (function) == NULL_TREE) | |
2539 | { | |
2540 | pedwarn ("ANSI C++ forbids calling `main' from within program"); | |
2541 | } | |
2542 | ||
a5894242 MS |
2543 | if (pedantic && DECL_THIS_INLINE (function) && ! DECL_INITIAL (function) |
2544 | && ! DECL_ARTIFICIAL (function) | |
2545 | && ! DECL_PENDING_INLINE_INFO (function)) | |
2546 | cp_pedwarn ("inline function `%#D' called before definition", | |
2547 | function); | |
2548 | ||
8d08fdba MS |
2549 | /* Differs from default_conversion by not setting TREE_ADDRESSABLE |
2550 | (because calling an inline function does not mean the function | |
2551 | needs to be separately compiled). */ | |
2552 | ||
2553 | if (DECL_INLINE (function)) | |
73aad9b9 | 2554 | function = inline_conversion (function); |
8d08fdba | 2555 | else |
4ac14744 | 2556 | function = build_addr_func (function); |
8d08fdba MS |
2557 | } |
2558 | else | |
2559 | { | |
2560 | fndecl = NULL_TREE; | |
2561 | ||
4ac14744 | 2562 | function = build_addr_func (function); |
8d08fdba MS |
2563 | } |
2564 | ||
4ac14744 MS |
2565 | if (function == error_mark_node) |
2566 | return error_mark_node; | |
2567 | ||
8d08fdba MS |
2568 | fntype = TREE_TYPE (function); |
2569 | ||
2570 | if (TYPE_PTRMEMFUNC_P (fntype)) | |
2571 | { | |
4ac14744 MS |
2572 | cp_error ("must use .* or ->* to call pointer-to-member function in `%E (...)'", |
2573 | function); | |
2574 | return error_mark_node; | |
8d08fdba MS |
2575 | } |
2576 | ||
2577 | is_method = (TREE_CODE (fntype) == POINTER_TYPE | |
2578 | && TREE_CODE (TREE_TYPE (fntype)) == METHOD_TYPE); | |
2579 | ||
2580 | if (!((TREE_CODE (fntype) == POINTER_TYPE | |
2581 | && TREE_CODE (TREE_TYPE (fntype)) == FUNCTION_TYPE) | |
2582 | || is_method)) | |
2583 | { | |
a5894242 | 2584 | cp_error ("`%E' cannot be used as a function", function); |
8d08fdba MS |
2585 | return error_mark_node; |
2586 | } | |
2587 | ||
2588 | /* fntype now gets the type of function pointed to. */ | |
2589 | fntype = TREE_TYPE (fntype); | |
2590 | ||
2591 | /* Convert the parameters to the types declared in the | |
2592 | function prototype, or apply default promotions. */ | |
2593 | ||
2594 | if (flags & LOOKUP_COMPLAIN) | |
2595 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2596 | params, fndecl, LOOKUP_NORMAL); | |
2597 | else | |
2598 | coerced_params = convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype), | |
2599 | params, fndecl, 0); | |
2600 | ||
863adfc0 | 2601 | if (coerced_params == error_mark_node) |
878cd289 MS |
2602 | if (flags & LOOKUP_SPECULATIVELY) |
2603 | return NULL_TREE; | |
2604 | else | |
2605 | return error_mark_node; | |
863adfc0 | 2606 | |
8d08fdba MS |
2607 | /* Check for errors in format strings. */ |
2608 | ||
2609 | if (warn_format && (name || assembler_name)) | |
2610 | check_function_format (name, assembler_name, coerced_params); | |
2611 | ||
2612 | /* Recognize certain built-in functions so we can make tree-codes | |
2613 | other than CALL_EXPR. We do this when it enables fold-const.c | |
2614 | to do something useful. */ | |
2615 | ||
2616 | if (TREE_CODE (function) == ADDR_EXPR | |
2617 | && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL | |
2618 | && DECL_BUILT_IN (TREE_OPERAND (function, 0))) | |
2619 | switch (DECL_FUNCTION_CODE (TREE_OPERAND (function, 0))) | |
2620 | { | |
2621 | case BUILT_IN_ABS: | |
2622 | case BUILT_IN_LABS: | |
2623 | case BUILT_IN_FABS: | |
2624 | if (coerced_params == 0) | |
2625 | return integer_zero_node; | |
2626 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
2627 | } | |
2628 | ||
2629 | /* C++ */ | |
2630 | value_type = TREE_TYPE (fntype) ? TREE_TYPE (fntype) : void_type_node; | |
2631 | { | |
4ac14744 MS |
2632 | register tree result |
2633 | = build_call (function, value_type, coerced_params); | |
8ccc31eb | 2634 | |
4ac14744 MS |
2635 | if (require_complete) |
2636 | { | |
2637 | if (value_type == void_type_node) | |
2638 | return result; | |
2639 | result = require_complete_type (result); | |
2640 | } | |
c73964b2 MS |
2641 | if (IS_AGGR_TYPE (value_type)) |
2642 | result = build_cplus_new (value_type, result); | |
8ccc31eb | 2643 | return convert_from_reference (result); |
8d08fdba MS |
2644 | } |
2645 | } | |
2646 | ||
2647 | tree | |
2648 | build_function_call (function, params) | |
2649 | tree function, params; | |
2650 | { | |
39211cd5 | 2651 | return build_function_call_real (function, params, 1, LOOKUP_NORMAL); |
8d08fdba | 2652 | } |
8d08fdba MS |
2653 | \f |
2654 | /* Convert the actual parameter expressions in the list VALUES | |
2655 | to the types in the list TYPELIST. | |
2656 | If parmdecls is exhausted, or when an element has NULL as its type, | |
2657 | perform the default conversions. | |
2658 | ||
2659 | RETURN_LOC is the location of the return value, if known, NULL_TREE | |
2660 | otherwise. This is useful in the case where we can avoid creating | |
2661 | a temporary variable in the case where we can initialize the return | |
2662 | value directly. If we are not eliding constructors, then we set this | |
2663 | to NULL_TREE to avoid this avoidance. | |
2664 | ||
2665 | NAME is an IDENTIFIER_NODE or 0. It is used only for error messages. | |
2666 | ||
2667 | This is also where warnings about wrong number of args are generated. | |
2668 | ||
2669 | Return a list of expressions for the parameters as converted. | |
2670 | ||
2671 | Both VALUES and the returned value are chains of TREE_LIST nodes | |
2672 | with the elements of the list in the TREE_VALUE slots of those nodes. | |
2673 | ||
2674 | In C++, unspecified trailing parameters can be filled in with their | |
2675 | default arguments, if such were specified. Do so here. */ | |
2676 | ||
2677 | tree | |
2678 | convert_arguments (return_loc, typelist, values, fndecl, flags) | |
2679 | tree return_loc, typelist, values, fndecl; | |
2680 | int flags; | |
2681 | { | |
8d08fdba MS |
2682 | register tree typetail, valtail; |
2683 | register tree result = NULL_TREE; | |
2684 | char *called_thing; | |
8d08fdba MS |
2685 | int i = 0; |
2686 | ||
2687 | if (! flag_elide_constructors) | |
2688 | return_loc = 0; | |
2689 | ||
2690 | if (fndecl) | |
2691 | { | |
2692 | if (TREE_CODE (TREE_TYPE (fndecl)) == METHOD_TYPE) | |
2693 | { | |
2694 | if (DECL_NAME (fndecl) == NULL_TREE | |
2695 | || IDENTIFIER_HAS_TYPE_VALUE (DECL_NAME (fndecl))) | |
2696 | called_thing = "constructor"; | |
2697 | else | |
2698 | called_thing = "member function"; | |
8d08fdba MS |
2699 | } |
2700 | else | |
a0a33927 | 2701 | called_thing = "function"; |
8d08fdba MS |
2702 | } |
2703 | ||
2704 | for (valtail = values, typetail = typelist; | |
2705 | valtail; | |
2706 | valtail = TREE_CHAIN (valtail), i++) | |
2707 | { | |
2708 | register tree type = typetail ? TREE_VALUE (typetail) : 0; | |
2709 | register tree val = TREE_VALUE (valtail); | |
2710 | ||
8ccc31eb | 2711 | if (val == error_mark_node) |
863adfc0 | 2712 | return error_mark_node; |
8ccc31eb | 2713 | |
8d08fdba MS |
2714 | if (type == void_type_node) |
2715 | { | |
2716 | if (fndecl) | |
2717 | { | |
fc378698 MS |
2718 | cp_error_at ("too many arguments to %s `%+D'", called_thing, |
2719 | fndecl); | |
8d08fdba MS |
2720 | error ("at this point in file"); |
2721 | } | |
2722 | else | |
2723 | error ("too many arguments to function"); | |
2724 | /* In case anybody wants to know if this argument | |
2725 | list is valid. */ | |
2726 | if (result) | |
2727 | TREE_TYPE (tree_last (result)) = error_mark_node; | |
2728 | break; | |
2729 | } | |
2730 | ||
2731 | /* The tree type of the parameter being passed may not yet be | |
2732 | known. In this case, its type is TYPE_UNKNOWN, and will | |
2733 | be instantiated by the type given by TYPE. If TYPE | |
2734 | is also NULL, the tree type of VAL is ERROR_MARK_NODE. */ | |
2735 | if (type && type_unknown_p (val)) | |
2736 | val = require_instantiated_type (type, val, integer_zero_node); | |
2737 | else if (type_unknown_p (val)) | |
2738 | { | |
2739 | /* Strip the `&' from an overloaded FUNCTION_DECL. */ | |
2740 | if (TREE_CODE (val) == ADDR_EXPR) | |
2741 | val = TREE_OPERAND (val, 0); | |
2742 | if (TREE_CODE (val) == TREE_LIST | |
2743 | && TREE_CHAIN (val) == NULL_TREE | |
2744 | && TREE_TYPE (TREE_VALUE (val)) != NULL_TREE | |
2745 | && (TREE_TYPE (val) == unknown_type_node | |
2746 | || DECL_CHAIN (TREE_VALUE (val)) == NULL_TREE)) | |
2747 | /* Instantiates automatically. */ | |
2748 | val = TREE_VALUE (val); | |
2749 | else | |
2750 | { | |
2751 | error ("insufficient type information in parameter list"); | |
2752 | val = integer_zero_node; | |
2753 | } | |
2754 | } | |
51c184be MS |
2755 | else if (TREE_CODE (val) == OFFSET_REF |
2756 | && TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) | |
2757 | { | |
e92cc029 | 2758 | /* This is unclean. Should be handled elsewhere. */ |
51c184be MS |
2759 | val = build_unary_op (ADDR_EXPR, val, 0); |
2760 | } | |
8d08fdba MS |
2761 | else if (TREE_CODE (val) == OFFSET_REF) |
2762 | val = resolve_offset_ref (val); | |
2763 | ||
8d08fdba MS |
2764 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
2765 | Strip such NOP_EXPRs, since VAL is used in non-lvalue context. */ | |
2766 | if (TREE_CODE (val) == NOP_EXPR | |
a0a33927 MS |
2767 | && TREE_TYPE (val) == TREE_TYPE (TREE_OPERAND (val, 0)) |
2768 | && (type == 0 || TREE_CODE (type) != REFERENCE_TYPE)) | |
8d08fdba MS |
2769 | val = TREE_OPERAND (val, 0); |
2770 | ||
00595019 MS |
2771 | if (type == 0 || TREE_CODE (type) != REFERENCE_TYPE) |
2772 | { | |
2773 | if (TREE_CODE (TREE_TYPE (val)) == ARRAY_TYPE | |
8d08fdba | 2774 | || TREE_CODE (TREE_TYPE (val)) == FUNCTION_TYPE |
00595019 MS |
2775 | || TREE_CODE (TREE_TYPE (val)) == METHOD_TYPE) |
2776 | val = default_conversion (val); | |
8d08fdba | 2777 | |
00595019 MS |
2778 | val = require_complete_type (val); |
2779 | } | |
8d08fdba MS |
2780 | |
2781 | if (val == error_mark_node) | |
863adfc0 | 2782 | return error_mark_node; |
8d08fdba | 2783 | |
8d08fdba MS |
2784 | if (type != 0) |
2785 | { | |
2786 | /* Formal parm type is specified by a function prototype. */ | |
2787 | tree parmval; | |
2788 | ||
e76a2646 | 2789 | if (TYPE_SIZE (complete_type (type)) == 0) |
8d08fdba MS |
2790 | { |
2791 | error ("parameter type of called function is incomplete"); | |
2792 | parmval = val; | |
2793 | } | |
2794 | else | |
2795 | { | |
72b7eeff MS |
2796 | parmval = convert_for_initialization (return_loc, type, val, |
2797 | flags|INDIRECT_BIND, | |
8d08fdba MS |
2798 | "argument passing", fndecl, i); |
2799 | #ifdef PROMOTE_PROTOTYPES | |
2800 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2801 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2802 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2803 | parmval = default_conversion (parmval); | |
2804 | #endif | |
2805 | } | |
878cd289 MS |
2806 | |
2807 | if (parmval == error_mark_node) | |
2808 | return error_mark_node; | |
2809 | ||
8d08fdba MS |
2810 | result = tree_cons (NULL_TREE, parmval, result); |
2811 | } | |
2812 | else | |
2813 | { | |
2814 | if (TREE_CODE (TREE_TYPE (val)) == REFERENCE_TYPE) | |
2815 | val = convert_from_reference (val); | |
2816 | ||
2817 | if (TREE_CODE (TREE_TYPE (val)) == REAL_TYPE | |
2818 | && (TYPE_PRECISION (TREE_TYPE (val)) | |
2819 | < TYPE_PRECISION (double_type_node))) | |
2820 | /* Convert `float' to `double'. */ | |
2821 | result = tree_cons (NULL_TREE, convert (double_type_node, val), result); | |
2822 | else if (TYPE_LANG_SPECIFIC (TREE_TYPE (val)) | |
e8abc66f | 2823 | && ! TYPE_HAS_TRIVIAL_INIT_REF (TREE_TYPE (val))) |
8d08fdba MS |
2824 | { |
2825 | cp_warning ("cannot pass objects of type `%T' through `...'", | |
2826 | TREE_TYPE (val)); | |
2827 | result = tree_cons (NULL_TREE, val, result); | |
2828 | } | |
2829 | else | |
2830 | /* Convert `short' and `char' to full-size `int'. */ | |
2831 | result = tree_cons (NULL_TREE, default_conversion (val), result); | |
2832 | } | |
2833 | ||
8d08fdba MS |
2834 | if (typetail) |
2835 | typetail = TREE_CHAIN (typetail); | |
2836 | } | |
2837 | ||
2838 | if (typetail != 0 && typetail != void_list_node) | |
2839 | { | |
2840 | /* See if there are default arguments that can be used */ | |
2841 | if (TREE_PURPOSE (typetail)) | |
2842 | { | |
f376e137 | 2843 | for (; typetail != void_list_node; ++i) |
8d08fdba MS |
2844 | { |
2845 | tree type = TREE_VALUE (typetail); | |
878cd289 | 2846 | tree val = break_out_target_exprs (TREE_PURPOSE (typetail)); |
8d08fdba MS |
2847 | tree parmval; |
2848 | ||
2849 | if (val == NULL_TREE) | |
2850 | parmval = error_mark_node; | |
2851 | else if (TREE_CODE (val) == CONSTRUCTOR) | |
2852 | { | |
2853 | parmval = digest_init (type, val, (tree *)0); | |
2854 | parmval = convert_for_initialization (return_loc, type, parmval, flags, | |
2855 | "default constructor", fndecl, i); | |
2856 | } | |
2857 | else | |
2858 | { | |
2859 | /* This could get clobbered by the following call. */ | |
2860 | if (TREE_HAS_CONSTRUCTOR (val)) | |
2861 | val = copy_node (val); | |
2862 | ||
2863 | parmval = convert_for_initialization (return_loc, type, val, flags, | |
2864 | "default argument", fndecl, i); | |
2865 | #ifdef PROMOTE_PROTOTYPES | |
2866 | if ((TREE_CODE (type) == INTEGER_TYPE | |
2867 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2868 | && (TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))) | |
2869 | parmval = default_conversion (parmval); | |
2870 | #endif | |
2871 | } | |
8d08fdba | 2872 | |
878cd289 MS |
2873 | if (parmval == error_mark_node) |
2874 | return error_mark_node; | |
2875 | ||
8d08fdba MS |
2876 | result = tree_cons (0, parmval, result); |
2877 | typetail = TREE_CHAIN (typetail); | |
2878 | /* ends with `...'. */ | |
2879 | if (typetail == NULL_TREE) | |
2880 | break; | |
2881 | } | |
2882 | } | |
2883 | else | |
2884 | { | |
2885 | if (fndecl) | |
2886 | { | |
2887 | char *buf = (char *)alloca (32 + strlen (called_thing)); | |
2888 | sprintf (buf, "too few arguments to %s `%%#D'", called_thing); | |
2889 | cp_error_at (buf, fndecl); | |
2890 | error ("at this point in file"); | |
2891 | } | |
2892 | else | |
2893 | error ("too few arguments to function"); | |
2894 | return error_mark_list; | |
2895 | } | |
2896 | } | |
8d08fdba MS |
2897 | |
2898 | return nreverse (result); | |
2899 | } | |
2900 | \f | |
2901 | /* Build a binary-operation expression, after performing default | |
2902 | conversions on the operands. CODE is the kind of expression to build. */ | |
2903 | ||
2904 | tree | |
2905 | build_x_binary_op (code, arg1, arg2) | |
2906 | enum tree_code code; | |
2907 | tree arg1, arg2; | |
2908 | { | |
5566b478 MS |
2909 | tree rval; |
2910 | ||
2911 | if (current_template_parms) | |
2912 | return build_min_nt (code, arg1, arg2); | |
2913 | ||
c73964b2 MS |
2914 | if (flag_ansi_overloading) |
2915 | return build_new_op (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); | |
2916 | ||
5566b478 MS |
2917 | rval = build_opfncall (code, LOOKUP_SPECULATIVELY, |
2918 | arg1, arg2, NULL_TREE); | |
8d08fdba MS |
2919 | if (rval) |
2920 | return build_opfncall (code, LOOKUP_NORMAL, arg1, arg2, NULL_TREE); | |
2921 | if (code == MEMBER_REF) | |
2922 | return build_m_component_ref (build_indirect_ref (arg1, NULL_PTR), | |
2923 | arg2); | |
2924 | return build_binary_op (code, arg1, arg2, 1); | |
2925 | } | |
2926 | ||
2927 | tree | |
2928 | build_binary_op (code, arg1, arg2, convert_p) | |
2929 | enum tree_code code; | |
2930 | tree arg1, arg2; | |
2931 | int convert_p; | |
2932 | { | |
8d08fdba MS |
2933 | tree args[2]; |
2934 | ||
2935 | args[0] = arg1; | |
2936 | args[1] = arg2; | |
2937 | ||
2938 | if (convert_p) | |
2939 | { | |
b7484fbe | 2940 | tree type0, type1; |
a9aedbc2 MS |
2941 | args[0] = decay_conversion (args[0]); |
2942 | args[1] = decay_conversion (args[1]); | |
8d08fdba | 2943 | |
b7484fbe MS |
2944 | if (args[0] == error_mark_node || args[1] == error_mark_node) |
2945 | return error_mark_node; | |
2946 | ||
2947 | type0 = TREE_TYPE (args[0]); | |
2948 | type1 = TREE_TYPE (args[1]); | |
2949 | ||
8d08fdba MS |
2950 | if (type_unknown_p (args[0])) |
2951 | { | |
b7484fbe | 2952 | args[0] = instantiate_type (type1, args[0], 1); |
a9aedbc2 | 2953 | args[0] = decay_conversion (args[0]); |
8d08fdba MS |
2954 | } |
2955 | else if (type_unknown_p (args[1])) | |
2956 | { | |
b7484fbe | 2957 | args[1] = require_instantiated_type (type0, args[1], |
8d08fdba | 2958 | error_mark_node); |
a9aedbc2 | 2959 | args[1] = decay_conversion (args[1]); |
8d08fdba MS |
2960 | } |
2961 | ||
b7484fbe | 2962 | if (IS_AGGR_TYPE (type0) || IS_AGGR_TYPE (type1)) |
8d08fdba MS |
2963 | { |
2964 | /* Try to convert this to something reasonable. */ | |
2965 | if (! build_default_binary_type_conversion(code, &args[0], &args[1])) | |
8d08fdba MS |
2966 | { |
2967 | cp_error ("no match for `%O(%#T, %#T)'", code, | |
21474714 | 2968 | TREE_TYPE (arg1), TREE_TYPE (arg2)); |
8d08fdba MS |
2969 | return error_mark_node; |
2970 | } | |
8d08fdba MS |
2971 | } |
2972 | } | |
2973 | return build_binary_op_nodefault (code, args[0], args[1], code); | |
2974 | } | |
2975 | ||
2976 | /* Build a binary-operation expression without default conversions. | |
2977 | CODE is the kind of expression to build. | |
2978 | This function differs from `build' in several ways: | |
2979 | the data type of the result is computed and recorded in it, | |
2980 | warnings are generated if arg data types are invalid, | |
2981 | special handling for addition and subtraction of pointers is known, | |
2982 | and some optimization is done (operations on narrow ints | |
2983 | are done in the narrower type when that gives the same result). | |
2984 | Constant folding is also done before the result is returned. | |
2985 | ||
2986 | ERROR_CODE is the code that determines what to say in error messages. | |
2987 | It is usually, but not always, the same as CODE. | |
2988 | ||
2989 | Note that the operands will never have enumeral types | |
2990 | because either they have just had the default conversions performed | |
2991 | or they have both just been converted to some other type in which | |
2992 | the arithmetic is to be done. | |
2993 | ||
2994 | C++: must do special pointer arithmetic when implementing | |
2995 | multiple inheritance, and deal with pointer to member functions. */ | |
2996 | ||
2997 | tree | |
39211cd5 | 2998 | build_binary_op_nodefault (code, orig_op0, orig_op1, error_code) |
8d08fdba | 2999 | enum tree_code code; |
39211cd5 | 3000 | tree orig_op0, orig_op1; |
8d08fdba MS |
3001 | enum tree_code error_code; |
3002 | { | |
39211cd5 MS |
3003 | tree op0, op1; |
3004 | register enum tree_code code0, code1; | |
3005 | tree type0, type1; | |
8d08fdba MS |
3006 | |
3007 | /* Expression code to give to the expression when it is built. | |
3008 | Normally this is CODE, which is what the caller asked for, | |
3009 | but in some special cases we change it. */ | |
3010 | register enum tree_code resultcode = code; | |
3011 | ||
3012 | /* Data type in which the computation is to be performed. | |
3013 | In the simplest cases this is the common type of the arguments. */ | |
3014 | register tree result_type = NULL; | |
3015 | ||
3016 | /* Nonzero means operands have already been type-converted | |
3017 | in whatever way is necessary. | |
3018 | Zero means they need to be converted to RESULT_TYPE. */ | |
3019 | int converted = 0; | |
3020 | ||
28cbf42c MS |
3021 | /* Nonzero means create the expression with this type, rather than |
3022 | RESULT_TYPE. */ | |
3023 | tree build_type = 0; | |
3024 | ||
8d08fdba | 3025 | /* Nonzero means after finally constructing the expression |
faae18ab | 3026 | convert it to this type. */ |
8d08fdba MS |
3027 | tree final_type = 0; |
3028 | ||
3029 | /* Nonzero if this is an operation like MIN or MAX which can | |
3030 | safely be computed in short if both args are promoted shorts. | |
3031 | Also implies COMMON. | |
3032 | -1 indicates a bitwise operation; this makes a difference | |
3033 | in the exact conditions for when it is safe to do the operation | |
3034 | in a narrower mode. */ | |
3035 | int shorten = 0; | |
3036 | ||
3037 | /* Nonzero if this is a comparison operation; | |
3038 | if both args are promoted shorts, compare the original shorts. | |
3039 | Also implies COMMON. */ | |
3040 | int short_compare = 0; | |
3041 | ||
3042 | /* Nonzero if this is a right-shift operation, which can be computed on the | |
3043 | original short and then promoted if the operand is a promoted short. */ | |
3044 | int short_shift = 0; | |
3045 | ||
3046 | /* Nonzero means set RESULT_TYPE to the common type of the args. */ | |
3047 | int common = 0; | |
3048 | ||
39211cd5 | 3049 | /* Apply default conversions. */ |
a9aedbc2 MS |
3050 | if (code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR |
3051 | || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR | |
3052 | || code == TRUTH_XOR_EXPR) | |
3053 | { | |
3054 | op0 = decay_conversion (orig_op0); | |
3055 | op1 = decay_conversion (orig_op1); | |
3056 | } | |
3057 | else | |
3058 | { | |
3059 | op0 = default_conversion (orig_op0); | |
3060 | op1 = default_conversion (orig_op1); | |
3061 | } | |
39211cd5 MS |
3062 | |
3063 | type0 = TREE_TYPE (op0); | |
3064 | type1 = TREE_TYPE (op1); | |
3065 | ||
3066 | /* The expression codes of the data types of the arguments tell us | |
3067 | whether the arguments are integers, floating, pointers, etc. */ | |
3068 | code0 = TREE_CODE (type0); | |
3069 | code1 = TREE_CODE (type1); | |
3070 | ||
8d08fdba MS |
3071 | /* Strip NON_LVALUE_EXPRs, etc., since we aren't using as an lvalue. */ |
3072 | STRIP_TYPE_NOPS (op0); | |
3073 | STRIP_TYPE_NOPS (op1); | |
3074 | ||
3075 | /* If an error was already reported for one of the arguments, | |
3076 | avoid reporting another error. */ | |
3077 | ||
3078 | if (code0 == ERROR_MARK || code1 == ERROR_MARK) | |
3079 | return error_mark_node; | |
3080 | ||
3081 | switch (code) | |
3082 | { | |
3083 | case PLUS_EXPR: | |
3084 | /* Handle the pointer + int case. */ | |
3085 | if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3086 | return pointer_int_sum (PLUS_EXPR, op0, op1); | |
3087 | else if (code1 == POINTER_TYPE && code0 == INTEGER_TYPE) | |
3088 | return pointer_int_sum (PLUS_EXPR, op1, op0); | |
3089 | else | |
3090 | common = 1; | |
3091 | break; | |
3092 | ||
3093 | case MINUS_EXPR: | |
3094 | /* Subtraction of two similar pointers. | |
3095 | We must subtract them as integers, then divide by object size. */ | |
3096 | if (code0 == POINTER_TYPE && code1 == POINTER_TYPE | |
3097 | && comp_target_types (type0, type1, 1)) | |
3098 | return pointer_diff (op0, op1); | |
3099 | /* Handle pointer minus int. Just like pointer plus int. */ | |
3100 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
3101 | return pointer_int_sum (MINUS_EXPR, op0, op1); | |
3102 | else | |
3103 | common = 1; | |
3104 | break; | |
3105 | ||
3106 | case MULT_EXPR: | |
3107 | common = 1; | |
3108 | break; | |
3109 | ||
3110 | case TRUNC_DIV_EXPR: | |
3111 | case CEIL_DIV_EXPR: | |
3112 | case FLOOR_DIV_EXPR: | |
3113 | case ROUND_DIV_EXPR: | |
3114 | case EXACT_DIV_EXPR: | |
3115 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3116 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3117 | { | |
a0a33927 | 3118 | if (TREE_CODE (op1) == INTEGER_CST && integer_zerop (op1)) |
5b605f68 | 3119 | cp_warning ("division by zero in `%E / 0'", op0); |
a0a33927 | 3120 | else if (TREE_CODE (op1) == REAL_CST && real_zerop (op1)) |
5b605f68 | 3121 | cp_warning ("division by zero in `%E / 0.'", op0); |
a0a33927 | 3122 | |
8d08fdba MS |
3123 | if (!(code0 == INTEGER_TYPE && code1 == INTEGER_TYPE)) |
3124 | resultcode = RDIV_EXPR; | |
3125 | else | |
3126 | /* When dividing two signed integers, we have to promote to int. | |
ddd5a7c1 | 3127 | unless we divide by a constant != -1. Note that default |
8d08fdba MS |
3128 | conversion will have been performed on the operands at this |
3129 | point, so we have to dig out the original type to find out if | |
3130 | it was unsigned. */ | |
3131 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3132 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3133 | || (TREE_CODE (op1) == INTEGER_CST | |
3134 | && (TREE_INT_CST_LOW (op1) != -1 | |
3135 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3136 | common = 1; | |
3137 | } | |
3138 | break; | |
3139 | ||
3140 | case BIT_AND_EXPR: | |
3141 | case BIT_ANDTC_EXPR: | |
3142 | case BIT_IOR_EXPR: | |
3143 | case BIT_XOR_EXPR: | |
3144 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3145 | shorten = -1; | |
3146 | /* If one operand is a constant, and the other is a short type | |
3147 | that has been converted to an int, | |
3148 | really do the work in the short type and then convert the | |
3149 | result to int. If we are lucky, the constant will be 0 or 1 | |
3150 | in the short type, making the entire operation go away. */ | |
3151 | if (TREE_CODE (op0) == INTEGER_CST | |
3152 | && TREE_CODE (op1) == NOP_EXPR | |
3153 | && TYPE_PRECISION (type1) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op1, 0))) | |
3154 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op1, 0)))) | |
3155 | { | |
3156 | final_type = result_type; | |
3157 | op1 = TREE_OPERAND (op1, 0); | |
3158 | result_type = TREE_TYPE (op1); | |
3159 | } | |
3160 | if (TREE_CODE (op1) == INTEGER_CST | |
3161 | && TREE_CODE (op0) == NOP_EXPR | |
3162 | && TYPE_PRECISION (type0) > TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op0, 0))) | |
3163 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3164 | { | |
3165 | final_type = result_type; | |
3166 | op0 = TREE_OPERAND (op0, 0); | |
3167 | result_type = TREE_TYPE (op0); | |
3168 | } | |
3169 | break; | |
3170 | ||
3171 | case TRUNC_MOD_EXPR: | |
3172 | case FLOOR_MOD_EXPR: | |
a0a33927 | 3173 | if (code1 == INTEGER_TYPE && integer_zerop (op1)) |
5b605f68 | 3174 | cp_warning ("division by zero in `%E % 0'", op0); |
a0a33927 | 3175 | else if (code1 == REAL_TYPE && real_zerop (op1)) |
5b605f68 | 3176 | cp_warning ("division by zero in `%E % 0.'", op0); |
a0a33927 | 3177 | |
8d08fdba MS |
3178 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) |
3179 | { | |
3180 | /* Although it would be tempting to shorten always here, that loses | |
3181 | on some targets, since the modulo instruction is undefined if the | |
3182 | quotient can't be represented in the computation mode. We shorten | |
3183 | only if unsigned or if dividing by something we know != -1. */ | |
3184 | shorten = ((TREE_CODE (op0) == NOP_EXPR | |
3185 | && TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op0, 0)))) | |
3186 | || (TREE_CODE (op1) == INTEGER_CST | |
3187 | && (TREE_INT_CST_LOW (op1) != -1 | |
3188 | || TREE_INT_CST_HIGH (op1) != -1))); | |
3189 | common = 1; | |
3190 | } | |
3191 | break; | |
3192 | ||
3193 | case TRUTH_ANDIF_EXPR: | |
3194 | case TRUTH_ORIF_EXPR: | |
3195 | case TRUTH_AND_EXPR: | |
3196 | case TRUTH_OR_EXPR: | |
255512c1 | 3197 | result_type = boolean_type_node; |
8d08fdba MS |
3198 | break; |
3199 | ||
3200 | /* Shift operations: result has same type as first operand; | |
3201 | always convert second operand to int. | |
3202 | Also set SHORT_SHIFT if shifting rightward. */ | |
3203 | ||
3204 | case RSHIFT_EXPR: | |
3205 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3206 | { | |
3207 | result_type = type0; | |
3208 | if (TREE_CODE (op1) == INTEGER_CST) | |
3209 | { | |
3210 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3211 | warning ("right shift count is negative"); | |
3212 | else | |
3213 | { | |
3214 | if (TREE_INT_CST_LOW (op1) | TREE_INT_CST_HIGH (op1)) | |
3215 | short_shift = 1; | |
3216 | if (TREE_INT_CST_HIGH (op1) != 0 | |
3217 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3218 | >= TYPE_PRECISION (type0))) | |
3219 | warning ("right shift count >= width of type"); | |
3220 | } | |
3221 | } | |
3222 | /* Convert the shift-count to an integer, regardless of | |
3223 | size of value being shifted. */ | |
3224 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3225 | op1 = convert (integer_type_node, op1); | |
3226 | /* Avoid converting op1 to result_type later. */ | |
3227 | converted = 1; | |
3228 | } | |
3229 | break; | |
3230 | ||
3231 | case LSHIFT_EXPR: | |
3232 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3233 | { | |
3234 | result_type = type0; | |
3235 | if (TREE_CODE (op1) == INTEGER_CST) | |
3236 | { | |
3237 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3238 | warning ("left shift count is negative"); | |
3239 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3240 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3241 | >= TYPE_PRECISION (type0))) | |
3242 | warning ("left shift count >= width of type"); | |
3243 | } | |
3244 | /* Convert the shift-count to an integer, regardless of | |
3245 | size of value being shifted. */ | |
3246 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3247 | op1 = convert (integer_type_node, op1); | |
3248 | /* Avoid converting op1 to result_type later. */ | |
3249 | converted = 1; | |
3250 | } | |
3251 | break; | |
3252 | ||
3253 | case RROTATE_EXPR: | |
3254 | case LROTATE_EXPR: | |
3255 | if (code0 == INTEGER_TYPE && code1 == INTEGER_TYPE) | |
3256 | { | |
3257 | result_type = type0; | |
3258 | if (TREE_CODE (op1) == INTEGER_CST) | |
3259 | { | |
3260 | if (tree_int_cst_lt (op1, integer_zero_node)) | |
3261 | warning ("%s rotate count is negative", | |
3262 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3263 | else if (TREE_INT_CST_HIGH (op1) != 0 | |
3264 | || ((unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (op1) | |
3265 | >= TYPE_PRECISION (type0))) | |
3266 | warning ("%s rotate count >= width of type", | |
3267 | (code == LROTATE_EXPR) ? "left" : "right"); | |
3268 | } | |
3269 | /* Convert the shift-count to an integer, regardless of | |
3270 | size of value being shifted. */ | |
3271 | if (TYPE_MAIN_VARIANT (TREE_TYPE (op1)) != integer_type_node) | |
3272 | op1 = convert (integer_type_node, op1); | |
3273 | } | |
3274 | break; | |
3275 | ||
3276 | case EQ_EXPR: | |
3277 | case NE_EXPR: | |
28cbf42c | 3278 | build_type = boolean_type_node; |
8d08fdba MS |
3279 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
3280 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3281 | short_compare = 1; | |
3282 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3283 | { | |
3284 | register tree tt0 = TYPE_MAIN_VARIANT (TREE_TYPE (type0)); | |
3285 | register tree tt1 = TYPE_MAIN_VARIANT (TREE_TYPE (type1)); | |
28cbf42c MS |
3286 | |
3287 | if (comp_target_types (type0, type1, 1)) | |
3288 | result_type = common_type (type0, type1); | |
8d08fdba MS |
3289 | else if (tt0 == void_type_node) |
3290 | { | |
a4443a08 MS |
3291 | if (pedantic && TREE_CODE (tt1) == FUNCTION_TYPE |
3292 | && tree_int_cst_lt (TYPE_SIZE (type0), TYPE_SIZE (type1))) | |
8d08fdba | 3293 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
b7484fbe MS |
3294 | else if (TREE_CODE (tt1) == OFFSET_TYPE) |
3295 | pedwarn ("ANSI C++ forbids conversion of a pointer to member to `void *'"); | |
8d08fdba MS |
3296 | } |
3297 | else if (tt1 == void_type_node) | |
3298 | { | |
a4443a08 MS |
3299 | if (pedantic && TREE_CODE (tt0) == FUNCTION_TYPE |
3300 | && tree_int_cst_lt (TYPE_SIZE (type1), TYPE_SIZE (type0))) | |
8d08fdba MS |
3301 | pedwarn ("ANSI C++ forbids comparison of `void *' with function pointer"); |
3302 | } | |
8d08fdba | 3303 | else |
2986ae00 MS |
3304 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", |
3305 | type0, type1); | |
faae18ab MS |
3306 | |
3307 | if (result_type == NULL_TREE) | |
3308 | result_type = ptr_type_node; | |
8d08fdba MS |
3309 | } |
3310 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3311 | && integer_zerop (op1)) | |
faae18ab | 3312 | result_type = type0; |
8d08fdba MS |
3313 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3314 | && integer_zerop (op0)) | |
faae18ab | 3315 | result_type = type1; |
8d08fdba MS |
3316 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3317 | { | |
faae18ab | 3318 | result_type = type0; |
8d08fdba | 3319 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3320 | } |
3321 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3322 | { | |
faae18ab | 3323 | result_type = type1; |
8d08fdba | 3324 | error ("ANSI C++ forbids comparison between pointer and integer"); |
8d08fdba MS |
3325 | } |
3326 | else if (TYPE_PTRMEMFUNC_P (type0) && TREE_CODE (op1) == INTEGER_CST | |
3327 | && integer_zerop (op1)) | |
3328 | { | |
4dabb379 | 3329 | op0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba | 3330 | op1 = integer_zero_node; |
faae18ab | 3331 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3332 | } |
3333 | else if (TYPE_PTRMEMFUNC_P (type1) && TREE_CODE (op0) == INTEGER_CST | |
3334 | && integer_zerop (op0)) | |
3335 | { | |
4dabb379 | 3336 | op0 = build_component_ref (op1, index_identifier, NULL_TREE, 0); |
8d08fdba | 3337 | op1 = integer_zero_node; |
faae18ab | 3338 | result_type = TREE_TYPE (op0); |
8d08fdba MS |
3339 | } |
3340 | else if (TYPE_PTRMEMFUNC_P (type0) && TYPE_PTRMEMFUNC_P (type1) | |
3341 | && (TYPE_PTRMEMFUNC_FN_TYPE (type0) | |
3342 | == TYPE_PTRMEMFUNC_FN_TYPE (type1))) | |
3343 | { | |
3344 | /* The code we generate for the test is: | |
3345 | ||
3346 | (op0.index == op1.index | |
3347 | && ((op1.index != -1 && op0.delta2 == op1.delta2) | |
3348 | || op0.pfn == op1.pfn)) */ | |
3349 | ||
4dabb379 MS |
3350 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
3351 | tree index1 = save_expr (build_component_ref (op1, index_identifier, NULL_TREE, 0)); | |
8d08fdba MS |
3352 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); |
3353 | tree pfn1 = PFN_FROM_PTRMEMFUNC (op1); | |
3354 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3355 | tree delta21 = DELTA2_FROM_PTRMEMFUNC (op1); | |
3356 | tree e1, e2, e3; | |
3357 | tree integer_neg_one_node | |
e1cd6e56 | 3358 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3359 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3360 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3361 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3362 | e3 = build_binary_op (EQ_EXPR, pfn0, pfn1, 1); | |
3363 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3364 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3365 | if (code == EQ_EXPR) | |
3366 | return e2; | |
3367 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3368 | } | |
3369 | else if (TYPE_PTRMEMFUNC_P (type0) | |
3370 | && TYPE_PTRMEMFUNC_FN_TYPE (type0) == type1) | |
3371 | { | |
4dabb379 | 3372 | tree index0 = build_component_ref (op0, index_identifier, NULL_TREE, 0); |
8d08fdba MS |
3373 | tree index1; |
3374 | tree pfn0 = PFN_FROM_PTRMEMFUNC (op0); | |
3375 | tree delta20 = DELTA2_FROM_PTRMEMFUNC (op0); | |
3376 | tree delta21 = integer_zero_node; | |
3377 | tree e1, e2, e3; | |
3378 | tree integer_neg_one_node | |
e1cd6e56 | 3379 | = build_binary_op (MINUS_EXPR, integer_zero_node, integer_one_node, 1); |
8d08fdba MS |
3380 | if (TREE_CODE (TREE_OPERAND (op1, 0)) == FUNCTION_DECL |
3381 | && DECL_VINDEX (TREE_OPERAND (op1, 0))) | |
3382 | { | |
3383 | /* Map everything down one to make room for the null pointer to member. */ | |
3384 | index1 = size_binop (PLUS_EXPR, | |
3385 | DECL_VINDEX (TREE_OPERAND (op1, 0)), | |
3386 | integer_one_node); | |
3387 | op1 = integer_zero_node; | |
3388 | delta21 = CLASSTYPE_VFIELD (TYPE_METHOD_BASETYPE (TREE_TYPE (type1))); | |
3389 | delta21 = DECL_FIELD_BITPOS (delta21); | |
3390 | delta21 = size_binop (FLOOR_DIV_EXPR, delta21, size_int (BITS_PER_UNIT)); | |
3391 | } | |
3392 | else | |
3393 | index1 = integer_neg_one_node; | |
51c184be MS |
3394 | { |
3395 | tree nop1 = build1 (NOP_EXPR, TYPE_PTRMEMFUNC_FN_TYPE (type0), op1); | |
3396 | TREE_CONSTANT (nop1) = TREE_CONSTANT (op1); | |
3397 | op1 = nop1; | |
3398 | } | |
8d08fdba MS |
3399 | e1 = build_binary_op (EQ_EXPR, index0, index1, 1); |
3400 | e2 = build_binary_op (NE_EXPR, index1, integer_neg_one_node, 1); | |
3401 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e2, build_binary_op (EQ_EXPR, delta20, delta21, 1), 1); | |
3402 | e3 = build_binary_op (EQ_EXPR, pfn0, op1, 1); | |
3403 | e2 = build_binary_op (TRUTH_ORIF_EXPR, e2, e3, 1); | |
3404 | e2 = build_binary_op (TRUTH_ANDIF_EXPR, e1, e2, 1); | |
3405 | if (code == EQ_EXPR) | |
3406 | return e2; | |
3407 | return build_binary_op (EQ_EXPR, e2, integer_zero_node, 1); | |
3408 | } | |
3409 | else if (TYPE_PTRMEMFUNC_P (type1) | |
3410 | && TYPE_PTRMEMFUNC_FN_TYPE (type1) == type0) | |
3411 | { | |
3412 | return build_binary_op (code, op1, op0, 1); | |
3413 | } | |
8d08fdba MS |
3414 | break; |
3415 | ||
3416 | case MAX_EXPR: | |
3417 | case MIN_EXPR: | |
3418 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3419 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3420 | shorten = 1; | |
3421 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3422 | { | |
faae18ab MS |
3423 | if (comp_target_types (type0, type1, 1)) |
3424 | result_type = common_type (type0, type1); | |
3425 | else | |
28cbf42c MS |
3426 | { |
3427 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3428 | type0, type1); | |
3429 | result_type = ptr_type_node; | |
3430 | } | |
8d08fdba MS |
3431 | } |
3432 | break; | |
3433 | ||
3434 | case LE_EXPR: | |
3435 | case GE_EXPR: | |
3436 | case LT_EXPR: | |
3437 | case GT_EXPR: | |
28cbf42c | 3438 | build_type = boolean_type_node; |
8d08fdba MS |
3439 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) |
3440 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3441 | short_compare = 1; | |
3442 | else if (code0 == POINTER_TYPE && code1 == POINTER_TYPE) | |
3443 | { | |
faae18ab | 3444 | if (comp_target_types (type0, type1, 1)) |
28cbf42c | 3445 | result_type = common_type (type0, type1); |
faae18ab MS |
3446 | else |
3447 | { | |
3448 | cp_pedwarn ("comparison of distinct pointer types `%T' and `%T' lacks a cast", | |
3449 | type0, type1); | |
3450 | result_type = ptr_type_node; | |
3451 | } | |
8d08fdba MS |
3452 | } |
3453 | else if (code0 == POINTER_TYPE && TREE_CODE (op1) == INTEGER_CST | |
3454 | && integer_zerop (op1)) | |
faae18ab | 3455 | result_type = type0; |
8d08fdba MS |
3456 | else if (code1 == POINTER_TYPE && TREE_CODE (op0) == INTEGER_CST |
3457 | && integer_zerop (op0)) | |
faae18ab | 3458 | result_type = type1; |
8d08fdba MS |
3459 | else if (code0 == POINTER_TYPE && code1 == INTEGER_TYPE) |
3460 | { | |
faae18ab | 3461 | result_type = type0; |
8d08fdba MS |
3462 | if (pedantic) |
3463 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); | |
3464 | else if (! flag_traditional) | |
3465 | warning ("comparison between pointer and integer"); | |
8d08fdba MS |
3466 | } |
3467 | else if (code0 == INTEGER_TYPE && code1 == POINTER_TYPE) | |
3468 | { | |
faae18ab | 3469 | result_type = type1; |
8d08fdba MS |
3470 | if (pedantic) |
3471 | pedwarn ("ANSI C++ forbids comparison between pointer and integer"); | |
3472 | else if (! flag_traditional) | |
3473 | warning ("comparison between pointer and integer"); | |
8d08fdba | 3474 | } |
8d08fdba MS |
3475 | break; |
3476 | } | |
3477 | ||
3478 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3479 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3480 | { | |
3481 | if (shorten || common || short_compare) | |
3482 | result_type = common_type (type0, type1); | |
3483 | ||
3484 | /* For certain operations (which identify themselves by shorten != 0) | |
3485 | if both args were extended from the same smaller type, | |
3486 | do the arithmetic in that type and then extend. | |
3487 | ||
3488 | shorten !=0 and !=1 indicates a bitwise operation. | |
3489 | For them, this optimization is safe only if | |
3490 | both args are zero-extended or both are sign-extended. | |
3491 | Otherwise, we might change the result. | |
3492 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
3493 | but calculated in (unsigned short) it would be (unsigned short)-1. */ | |
3494 | ||
3495 | if (shorten) | |
3496 | { | |
3497 | int unsigned0, unsigned1; | |
3498 | tree arg0 = get_narrower (op0, &unsigned0); | |
3499 | tree arg1 = get_narrower (op1, &unsigned1); | |
3500 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
3501 | int uns = TREE_UNSIGNED (result_type); | |
3502 | tree type; | |
3503 | ||
3504 | final_type = result_type; | |
3505 | ||
3506 | /* Handle the case that OP0 does not *contain* a conversion | |
3507 | but it *requires* conversion to FINAL_TYPE. */ | |
3508 | ||
3509 | if (op0 == arg0 && TREE_TYPE (op0) != final_type) | |
3510 | unsigned0 = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3511 | if (op1 == arg1 && TREE_TYPE (op1) != final_type) | |
3512 | unsigned1 = TREE_UNSIGNED (TREE_TYPE (op1)); | |
3513 | ||
3514 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
3515 | ||
3516 | /* For bitwise operations, signedness of nominal type | |
3517 | does not matter. Consider only how operands were extended. */ | |
3518 | if (shorten == -1) | |
3519 | uns = unsigned0; | |
3520 | ||
3521 | /* Note that in all three cases below we refrain from optimizing | |
3522 | an unsigned operation on sign-extended args. | |
3523 | That would not be valid. */ | |
3524 | ||
3525 | /* Both args variable: if both extended in same way | |
3526 | from same width, do it in that width. | |
3527 | Do it unsigned if args were zero-extended. */ | |
3528 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
3529 | < TYPE_PRECISION (result_type)) | |
3530 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3531 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
3532 | && unsigned0 == unsigned1 | |
3533 | && (unsigned0 || !uns)) | |
3534 | result_type | |
3535 | = signed_or_unsigned_type (unsigned0, | |
3536 | common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
3537 | else if (TREE_CODE (arg0) == INTEGER_CST | |
3538 | && (unsigned1 || !uns) | |
3539 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
3540 | < TYPE_PRECISION (result_type)) | |
3541 | && (type = signed_or_unsigned_type (unsigned1, | |
3542 | TREE_TYPE (arg1)), | |
3543 | int_fits_type_p (arg0, type))) | |
3544 | result_type = type; | |
3545 | else if (TREE_CODE (arg1) == INTEGER_CST | |
3546 | && (unsigned0 || !uns) | |
3547 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
3548 | < TYPE_PRECISION (result_type)) | |
3549 | && (type = signed_or_unsigned_type (unsigned0, | |
3550 | TREE_TYPE (arg0)), | |
3551 | int_fits_type_p (arg1, type))) | |
3552 | result_type = type; | |
3553 | } | |
3554 | ||
3555 | /* Shifts can be shortened if shifting right. */ | |
3556 | ||
3557 | if (short_shift) | |
3558 | { | |
3559 | int unsigned_arg; | |
3560 | tree arg0 = get_narrower (op0, &unsigned_arg); | |
3561 | ||
3562 | final_type = result_type; | |
3563 | ||
3564 | if (arg0 == op0 && final_type == TREE_TYPE (op0)) | |
3565 | unsigned_arg = TREE_UNSIGNED (TREE_TYPE (op0)); | |
3566 | ||
3567 | if (TYPE_PRECISION (TREE_TYPE (arg0)) < TYPE_PRECISION (result_type) | |
db5ae43f MS |
3568 | /* We can shorten only if the shift count is less than the |
3569 | number of bits in the smaller type size. */ | |
3570 | && TREE_INT_CST_HIGH (op1) == 0 | |
3571 | && TYPE_PRECISION (TREE_TYPE (arg0)) > TREE_INT_CST_LOW (op1) | |
8d08fdba MS |
3572 | /* If arg is sign-extended and then unsigned-shifted, |
3573 | we can simulate this with a signed shift in arg's type | |
3574 | only if the extended result is at least twice as wide | |
3575 | as the arg. Otherwise, the shift could use up all the | |
3576 | ones made by sign-extension and bring in zeros. | |
3577 | We can't optimize that case at all, but in most machines | |
3578 | it never happens because available widths are 2**N. */ | |
3579 | && (!TREE_UNSIGNED (final_type) | |
3580 | || unsigned_arg | |
5566b478 | 3581 | || (((unsigned) 2 * TYPE_PRECISION (TREE_TYPE (arg0))) |
8d08fdba MS |
3582 | <= TYPE_PRECISION (result_type)))) |
3583 | { | |
3584 | /* Do an unsigned shift if the operand was zero-extended. */ | |
3585 | result_type | |
3586 | = signed_or_unsigned_type (unsigned_arg, | |
3587 | TREE_TYPE (arg0)); | |
3588 | /* Convert value-to-be-shifted to that type. */ | |
3589 | if (TREE_TYPE (op0) != result_type) | |
3590 | op0 = convert (result_type, op0); | |
3591 | converted = 1; | |
3592 | } | |
3593 | } | |
3594 | ||
3595 | /* Comparison operations are shortened too but differently. | |
3596 | They identify themselves by setting short_compare = 1. */ | |
3597 | ||
3598 | if (short_compare) | |
3599 | { | |
3600 | /* Don't write &op0, etc., because that would prevent op0 | |
3601 | from being kept in a register. | |
3602 | Instead, make copies of the our local variables and | |
3603 | pass the copies by reference, then copy them back afterward. */ | |
3604 | tree xop0 = op0, xop1 = op1, xresult_type = result_type; | |
3605 | enum tree_code xresultcode = resultcode; | |
3606 | tree val | |
3607 | = shorten_compare (&xop0, &xop1, &xresult_type, &xresultcode); | |
3608 | if (val != 0) | |
255512c1 | 3609 | return convert (boolean_type_node, val); |
28cbf42c MS |
3610 | op0 = xop0, op1 = xop1; |
3611 | converted = 1; | |
8d08fdba MS |
3612 | resultcode = xresultcode; |
3613 | } | |
3614 | ||
2ee887f2 | 3615 | if (short_compare && warn_sign_compare) |
8d08fdba | 3616 | { |
e3417fcd MS |
3617 | int op0_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op0)); |
3618 | int op1_signed = ! TREE_UNSIGNED (TREE_TYPE (orig_op1)); | |
3619 | ||
8d08fdba MS |
3620 | int unsignedp0, unsignedp1; |
3621 | tree primop0 = get_narrower (op0, &unsignedp0); | |
3622 | tree primop1 = get_narrower (op1, &unsignedp1); | |
3623 | ||
e92cc029 | 3624 | /* Check for comparison of different enum types. */ |
72b7eeff MS |
3625 | if (flag_int_enum_equivalence == 0 |
3626 | && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE | |
3627 | && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE | |
3628 | && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0)) | |
3629 | != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1))) | |
3630 | { | |
3631 | cp_warning ("comparison between `%#T' and `%#T'", | |
3632 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1)); | |
3633 | } | |
3634 | ||
e3417fcd | 3635 | /* Give warnings for comparisons between signed and unsigned |
faae18ab | 3636 | quantities that may fail. */ |
e3417fcd MS |
3637 | /* Do the checking based on the original operand trees, so that |
3638 | casts will be considered, but default promotions won't be. */ | |
faae18ab MS |
3639 | |
3640 | /* Do not warn if the comparison is being done in a signed type, | |
3641 | since the signed type will only be chosen if it can represent | |
3642 | all the values of the unsigned type. */ | |
3643 | if (! TREE_UNSIGNED (result_type)) | |
3644 | /* OK */; | |
b19b4a78 MS |
3645 | /* Do not warn if both operands are unsigned. */ |
3646 | else if (op0_signed == op1_signed) | |
3647 | /* OK */; | |
faae18ab MS |
3648 | /* Do not warn if the signed quantity is an unsuffixed |
3649 | integer literal (or some static constant expression | |
3650 | involving such literals) and it is non-negative. */ | |
3651 | else if ((op0_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3652 | && tree_int_cst_sgn (orig_op0) >= 0) | |
3653 | || (op1_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3654 | && tree_int_cst_sgn (orig_op1) >= 0)) | |
3655 | /* OK */; | |
3656 | /* Do not warn if the comparison is an equality operation, | |
3657 | the unsigned quantity is an integral constant and it does | |
3658 | not use the most significant bit of result_type. */ | |
3659 | else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
3660 | && ((op0_signed && TREE_CODE (orig_op1) == INTEGER_CST | |
3661 | && int_fits_type_p (orig_op1, signed_type (result_type)) | |
3662 | || (op1_signed && TREE_CODE (orig_op0) == INTEGER_CST | |
3663 | && int_fits_type_p (orig_op0, signed_type (result_type)))))) | |
3664 | /* OK */; | |
3665 | else | |
e3417fcd | 3666 | warning ("comparison between signed and unsigned"); |
8d08fdba MS |
3667 | |
3668 | /* Warn if two unsigned values are being compared in a size | |
3669 | larger than their original size, and one (and only one) is the | |
3670 | result of a `~' operator. This comparison will always fail. | |
3671 | ||
3672 | Also warn if one operand is a constant, and the constant does not | |
3673 | have all bits set that are set in the ~ operand when it is | |
3674 | extended. */ | |
3675 | ||
5566b478 MS |
3676 | if ((TREE_CODE (primop0) == BIT_NOT_EXPR) |
3677 | ^ (TREE_CODE (primop1) == BIT_NOT_EXPR)) | |
8d08fdba MS |
3678 | { |
3679 | if (TREE_CODE (primop0) == BIT_NOT_EXPR) | |
3680 | primop0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); | |
3681 | if (TREE_CODE (primop1) == BIT_NOT_EXPR) | |
3682 | primop1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); | |
3683 | ||
3684 | if (TREE_CODE (primop0) == INTEGER_CST | |
3685 | || TREE_CODE (primop1) == INTEGER_CST) | |
3686 | { | |
3687 | tree primop; | |
3688 | HOST_WIDE_INT constant, mask; | |
3689 | int unsignedp; | |
3690 | unsigned bits; | |
3691 | ||
3692 | if (TREE_CODE (primop0) == INTEGER_CST) | |
3693 | { | |
3694 | primop = primop1; | |
3695 | unsignedp = unsignedp1; | |
3696 | constant = TREE_INT_CST_LOW (primop0); | |
3697 | } | |
3698 | else | |
3699 | { | |
3700 | primop = primop0; | |
3701 | unsignedp = unsignedp0; | |
3702 | constant = TREE_INT_CST_LOW (primop1); | |
3703 | } | |
3704 | ||
3705 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
faae18ab | 3706 | if (bits < TYPE_PRECISION (result_type) |
8d08fdba MS |
3707 | && bits < HOST_BITS_PER_LONG && unsignedp) |
3708 | { | |
3709 | mask = (~ (HOST_WIDE_INT) 0) << bits; | |
3710 | if ((mask & constant) != mask) | |
3711 | warning ("comparison of promoted ~unsigned with constant"); | |
3712 | } | |
3713 | } | |
3714 | else if (unsignedp0 && unsignedp1 | |
3715 | && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
faae18ab | 3716 | < TYPE_PRECISION (result_type)) |
8d08fdba | 3717 | && (TYPE_PRECISION (TREE_TYPE (primop1)) |
faae18ab | 3718 | < TYPE_PRECISION (result_type))) |
8d08fdba MS |
3719 | warning ("comparison of promoted ~unsigned with unsigned"); |
3720 | } | |
3721 | } | |
3722 | } | |
3723 | ||
3724 | /* At this point, RESULT_TYPE must be nonzero to avoid an error message. | |
3725 | If CONVERTED is zero, both args will be converted to type RESULT_TYPE. | |
3726 | Then the expression will be built. | |
3727 | It will be given type FINAL_TYPE if that is nonzero; | |
3728 | otherwise, it will be given type RESULT_TYPE. */ | |
3729 | ||
3730 | if (!result_type) | |
3731 | { | |
faae18ab MS |
3732 | cp_error ("invalid operands `%T' and `%T' to binary `%O'", |
3733 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1), error_code); | |
8d08fdba MS |
3734 | return error_mark_node; |
3735 | } | |
3736 | ||
3737 | if (! converted) | |
3738 | { | |
3739 | if (TREE_TYPE (op0) != result_type) | |
3740 | op0 = convert (result_type, op0); | |
3741 | if (TREE_TYPE (op1) != result_type) | |
3742 | op1 = convert (result_type, op1); | |
3743 | } | |
3744 | ||
28cbf42c MS |
3745 | if (build_type == NULL_TREE) |
3746 | build_type = result_type; | |
3747 | ||
8d08fdba | 3748 | { |
28cbf42c | 3749 | register tree result = build (resultcode, build_type, op0, op1); |
8d08fdba MS |
3750 | register tree folded; |
3751 | ||
3752 | folded = fold (result); | |
3753 | if (folded == result) | |
3754 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3755 | if (final_type != 0) | |
3756 | return convert (final_type, folded); | |
3757 | return folded; | |
3758 | } | |
3759 | } | |
3760 | \f | |
3761 | /* Return a tree for the sum or difference (RESULTCODE says which) | |
3762 | of pointer PTROP and integer INTOP. */ | |
3763 | ||
3764 | static tree | |
3765 | pointer_int_sum (resultcode, ptrop, intop) | |
3766 | enum tree_code resultcode; | |
3767 | register tree ptrop, intop; | |
3768 | { | |
3769 | tree size_exp; | |
3770 | ||
3771 | register tree result; | |
3772 | register tree folded = fold (intop); | |
3773 | ||
3774 | /* The result is a pointer of the same type that is being added. */ | |
3775 | ||
3776 | register tree result_type = TREE_TYPE (ptrop); | |
3777 | ||
8d08fdba MS |
3778 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) |
3779 | { | |
3780 | if (pedantic || warn_pointer_arith) | |
3781 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in arithmetic"); | |
3782 | size_exp = integer_one_node; | |
3783 | } | |
3784 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
3785 | { | |
3786 | if (pedantic || warn_pointer_arith) | |
3787 | pedwarn ("ANSI C++ forbids using pointer to a function in arithmetic"); | |
3788 | size_exp = integer_one_node; | |
3789 | } | |
3790 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
3791 | { | |
3792 | if (pedantic || warn_pointer_arith) | |
3793 | pedwarn ("ANSI C++ forbids using pointer to a method in arithmetic"); | |
3794 | size_exp = integer_one_node; | |
3795 | } | |
3796 | else if (TREE_CODE (TREE_TYPE (result_type)) == OFFSET_TYPE) | |
3797 | { | |
be99da77 | 3798 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3799 | pedwarn ("ANSI C++ forbids using pointer to a member in arithmetic"); |
3800 | size_exp = integer_one_node; | |
3801 | } | |
3802 | else | |
5566b478 | 3803 | size_exp = size_in_bytes (complete_type (TREE_TYPE (result_type))); |
8d08fdba | 3804 | |
a4443a08 MS |
3805 | /* Needed to make OOPS V2R3 work. */ |
3806 | intop = folded; | |
3807 | if (TREE_CODE (intop) == INTEGER_CST | |
3808 | && TREE_INT_CST_LOW (intop) == 0 | |
3809 | && TREE_INT_CST_HIGH (intop) == 0) | |
3810 | return ptrop; | |
3811 | ||
8d08fdba MS |
3812 | /* If what we are about to multiply by the size of the elements |
3813 | contains a constant term, apply distributive law | |
3814 | and multiply that constant term separately. | |
3815 | This helps produce common subexpressions. */ | |
3816 | ||
3817 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
3818 | && ! TREE_CONSTANT (intop) | |
3819 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
3820 | && TREE_CONSTANT (size_exp)) | |
3821 | { | |
3822 | enum tree_code subcode = resultcode; | |
3823 | if (TREE_CODE (intop) == MINUS_EXPR) | |
3824 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
3825 | ptrop = build_binary_op (subcode, ptrop, TREE_OPERAND (intop, 1), 1); | |
3826 | intop = TREE_OPERAND (intop, 0); | |
3827 | } | |
3828 | ||
9e9ff709 | 3829 | /* Convert the integer argument to a type the same size as sizetype |
8d08fdba MS |
3830 | so the multiply won't overflow spuriously. */ |
3831 | ||
9e9ff709 MS |
3832 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)) |
3833 | intop = convert (type_for_size (TYPE_PRECISION (sizetype), 0), intop); | |
8d08fdba | 3834 | |
39211cd5 MS |
3835 | /* Replace the integer argument with a suitable product by the object size. |
3836 | Do this multiplication as signed, then convert to the appropriate | |
3837 | pointer type (actually unsigned integral). */ | |
8d08fdba | 3838 | |
39211cd5 MS |
3839 | intop = convert (result_type, |
3840 | build_binary_op (MULT_EXPR, intop, | |
3841 | convert (TREE_TYPE (intop), size_exp), 1)); | |
8d08fdba MS |
3842 | |
3843 | /* Create the sum or difference. */ | |
3844 | ||
3845 | result = build (resultcode, result_type, ptrop, intop); | |
3846 | ||
3847 | folded = fold (result); | |
3848 | if (folded == result) | |
3849 | TREE_CONSTANT (folded) = TREE_CONSTANT (ptrop) & TREE_CONSTANT (intop); | |
3850 | return folded; | |
3851 | } | |
3852 | ||
3853 | /* Return a tree for the difference of pointers OP0 and OP1. | |
3854 | The resulting tree has type int. */ | |
3855 | ||
3856 | static tree | |
3857 | pointer_diff (op0, op1) | |
3858 | register tree op0, op1; | |
3859 | { | |
3860 | register tree result, folded; | |
3861 | tree restype = ptrdiff_type_node; | |
3862 | tree target_type = TREE_TYPE (TREE_TYPE (op0)); | |
3863 | ||
be99da77 | 3864 | if (pedantic || warn_pointer_arith) |
8d08fdba MS |
3865 | { |
3866 | if (TREE_CODE (target_type) == VOID_TYPE) | |
3867 | pedwarn ("ANSI C++ forbids using pointer of type `void *' in subtraction"); | |
3868 | if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
3869 | pedwarn ("ANSI C++ forbids using pointer to a function in subtraction"); | |
3870 | if (TREE_CODE (target_type) == METHOD_TYPE) | |
3871 | pedwarn ("ANSI C++ forbids using pointer to a method in subtraction"); | |
3872 | if (TREE_CODE (target_type) == OFFSET_TYPE) | |
3873 | pedwarn ("ANSI C++ forbids using pointer to a member in subtraction"); | |
3874 | } | |
3875 | ||
3876 | /* First do the subtraction as integers; | |
3877 | then drop through to build the divide operator. */ | |
3878 | ||
3879 | op0 = build_binary_op (MINUS_EXPR, | |
3880 | convert (restype, op0), convert (restype, op1), 1); | |
3881 | ||
3882 | /* This generates an error if op1 is a pointer to an incomplete type. */ | |
3883 | if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (op1))) == 0) | |
3884 | error ("arithmetic on pointer to an incomplete type"); | |
3885 | ||
3886 | op1 = ((TREE_CODE (target_type) == VOID_TYPE | |
3887 | || TREE_CODE (target_type) == FUNCTION_TYPE | |
3888 | || TREE_CODE (target_type) == METHOD_TYPE | |
3889 | || TREE_CODE (target_type) == OFFSET_TYPE) | |
3890 | ? integer_one_node | |
3891 | : size_in_bytes (target_type)); | |
3892 | ||
3893 | /* Do the division. */ | |
3894 | ||
39211cd5 | 3895 | result = build (EXACT_DIV_EXPR, restype, op0, convert (restype, op1)); |
8d08fdba MS |
3896 | |
3897 | folded = fold (result); | |
3898 | if (folded == result) | |
3899 | TREE_CONSTANT (folded) = TREE_CONSTANT (op0) & TREE_CONSTANT (op1); | |
3900 | return folded; | |
3901 | } | |
3902 | \f | |
3903 | /* Handle the case of taking the address of a COMPONENT_REF. | |
3904 | Called by `build_unary_op' and `build_up_reference'. | |
3905 | ||
3906 | ARG is the COMPONENT_REF whose address we want. | |
3907 | ARGTYPE is the pointer type that this address should have. | |
3908 | MSG is an error message to print if this COMPONENT_REF is not | |
3909 | addressable (such as a bitfield). */ | |
3910 | ||
3911 | tree | |
3912 | build_component_addr (arg, argtype, msg) | |
3913 | tree arg, argtype; | |
3914 | char *msg; | |
3915 | { | |
3916 | tree field = TREE_OPERAND (arg, 1); | |
3917 | tree basetype = decl_type_context (field); | |
3918 | tree rval = build_unary_op (ADDR_EXPR, TREE_OPERAND (arg, 0), 0); | |
3919 | ||
3920 | if (DECL_BIT_FIELD (field)) | |
3921 | { | |
3922 | error (msg, IDENTIFIER_POINTER (DECL_NAME (field))); | |
3923 | return error_mark_node; | |
3924 | } | |
3925 | ||
8d08fdba MS |
3926 | if (TREE_CODE (field) == FIELD_DECL |
3927 | && TYPE_USES_COMPLEX_INHERITANCE (basetype)) | |
51c184be MS |
3928 | { |
3929 | /* Can't convert directly to ARGTYPE, since that | |
3930 | may have the same pointer type as one of our | |
3931 | baseclasses. */ | |
3932 | rval = build1 (NOP_EXPR, argtype, | |
3933 | convert_pointer_to (basetype, rval)); | |
8926095f | 3934 | TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0)); |
51c184be | 3935 | } |
8d08fdba MS |
3936 | else |
3937 | /* This conversion is harmless. */ | |
6060a796 | 3938 | rval = convert_force (argtype, rval, 0); |
8d08fdba MS |
3939 | |
3940 | if (! integer_zerop (DECL_FIELD_BITPOS (field))) | |
3941 | { | |
3942 | tree offset = size_binop (EASY_DIV_EXPR, DECL_FIELD_BITPOS (field), | |
3943 | size_int (BITS_PER_UNIT)); | |
3944 | int flag = TREE_CONSTANT (rval); | |
3945 | rval = fold (build (PLUS_EXPR, argtype, | |
3946 | rval, convert (argtype, offset))); | |
3947 | TREE_CONSTANT (rval) = flag; | |
3948 | } | |
3949 | return rval; | |
3950 | } | |
3951 | ||
3952 | /* Construct and perhaps optimize a tree representation | |
3953 | for a unary operation. CODE, a tree_code, specifies the operation | |
3954 | and XARG is the operand. */ | |
3955 | ||
3956 | tree | |
3957 | build_x_unary_op (code, xarg) | |
3958 | enum tree_code code; | |
3959 | tree xarg; | |
3960 | { | |
5566b478 MS |
3961 | if (current_template_parms) |
3962 | return build_min_nt (code, xarg, NULL_TREE); | |
3963 | ||
8d08fdba | 3964 | /* & rec, on incomplete RECORD_TYPEs is the simple opr &, not an |
e92cc029 | 3965 | error message. */ |
db5ae43f MS |
3966 | if (code == ADDR_EXPR |
3967 | && ((IS_AGGR_TYPE_CODE (TREE_CODE (TREE_TYPE (xarg))) | |
3968 | && TYPE_SIZE (TREE_TYPE (xarg)) == NULL_TREE) | |
3969 | || (TREE_CODE (xarg) == OFFSET_REF))) | |
3970 | /* don't look for a function */; | |
3971 | else | |
8d08fdba | 3972 | { |
c73964b2 MS |
3973 | tree rval; |
3974 | ||
3975 | if (flag_ansi_overloading) | |
3976 | { | |
3977 | rval = build_new_op (code, LOOKUP_NORMAL, xarg, | |
8d08fdba | 3978 | NULL_TREE, NULL_TREE); |
c73964b2 MS |
3979 | if (rval || code != ADDR_EXPR) |
3980 | return rval; | |
3981 | } | |
3982 | else | |
3983 | { | |
3984 | rval = build_opfncall (code, LOOKUP_SPECULATIVELY, xarg, | |
3985 | NULL_TREE, NULL_TREE); | |
3986 | if (rval) | |
3987 | return build_opfncall (code, LOOKUP_NORMAL, xarg, | |
3988 | NULL_TREE, NULL_TREE); | |
3989 | } | |
8d08fdba | 3990 | } |
c91a56d2 MS |
3991 | |
3992 | if (code == ADDR_EXPR) | |
3993 | { | |
3994 | if (TREE_CODE (xarg) == TARGET_EXPR) | |
3995 | warning ("taking address of temporary"); | |
3996 | } | |
3997 | ||
8d08fdba MS |
3998 | return build_unary_op (code, xarg, 0); |
3999 | } | |
4000 | ||
8ccc31eb MS |
4001 | /* Just like truthvalue_conversion, but we want a CLEANUP_POINT_EXPR. */ |
4002 | ||
2986ae00 | 4003 | tree |
8ccc31eb | 4004 | condition_conversion (expr) |
2986ae00 MS |
4005 | tree expr; |
4006 | { | |
5566b478 MS |
4007 | tree t; |
4008 | if (current_template_parms) | |
4009 | return expr; | |
4010 | t = convert (boolean_type_node, expr); | |
8ccc31eb MS |
4011 | t = fold (build1 (CLEANUP_POINT_EXPR, boolean_type_node, t)); |
4012 | return t; | |
2986ae00 | 4013 | } |
8ccc31eb | 4014 | |
8d08fdba MS |
4015 | /* C++: Must handle pointers to members. |
4016 | ||
4017 | Perhaps type instantiation should be extended to handle conversion | |
4018 | from aggregates to types we don't yet know we want? (Or are those | |
4019 | cases typically errors which should be reported?) | |
4020 | ||
4021 | NOCONVERT nonzero suppresses the default promotions | |
4022 | (such as from short to int). */ | |
e92cc029 | 4023 | |
8d08fdba MS |
4024 | tree |
4025 | build_unary_op (code, xarg, noconvert) | |
4026 | enum tree_code code; | |
4027 | tree xarg; | |
4028 | int noconvert; | |
4029 | { | |
4030 | /* No default_conversion here. It causes trouble for ADDR_EXPR. */ | |
4031 | register tree arg = xarg; | |
4032 | register tree argtype = 0; | |
8d08fdba MS |
4033 | char *errstring = NULL; |
4034 | tree val; | |
8d08fdba | 4035 | |
b7484fbe | 4036 | if (arg == error_mark_node) |
8d08fdba MS |
4037 | return error_mark_node; |
4038 | ||
8d08fdba MS |
4039 | switch (code) |
4040 | { | |
4041 | case CONVERT_EXPR: | |
4042 | /* This is used for unary plus, because a CONVERT_EXPR | |
4043 | is enough to prevent anybody from looking inside for | |
4044 | associativity, but won't generate any code. */ | |
b7484fbe MS |
4045 | if (!(arg = build_expr_type_conversion |
4046 | (WANT_ARITH | WANT_ENUM | WANT_POINTER, arg, 1))) | |
4047 | errstring = "wrong type argument to unary plus"; | |
4048 | else | |
8d08fdba MS |
4049 | { |
4050 | if (!noconvert) | |
b7484fbe MS |
4051 | arg = default_conversion (arg); |
4052 | arg = build1 (NON_LVALUE_EXPR, TREE_TYPE (arg), arg); | |
8d08fdba | 4053 | } |
b7484fbe | 4054 | break; |
8d08fdba | 4055 | |
b7484fbe MS |
4056 | case NEGATE_EXPR: |
4057 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) | |
4058 | errstring = "wrong type argument to unary minus"; | |
8d08fdba MS |
4059 | else if (!noconvert) |
4060 | arg = default_conversion (arg); | |
4061 | break; | |
4062 | ||
4063 | case BIT_NOT_EXPR: | |
b7484fbe MS |
4064 | if (!(arg = build_expr_type_conversion (WANT_INT | WANT_ENUM, arg, 1))) |
4065 | errstring = "wrong type argument to bit-complement"; | |
8d08fdba MS |
4066 | else if (!noconvert) |
4067 | arg = default_conversion (arg); | |
4068 | break; | |
4069 | ||
4070 | case ABS_EXPR: | |
b7484fbe MS |
4071 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, arg, 1))) |
4072 | errstring = "wrong type argument to abs"; | |
8d08fdba MS |
4073 | else if (!noconvert) |
4074 | arg = default_conversion (arg); | |
4075 | break; | |
4076 | ||
4077 | case TRUTH_NOT_EXPR: | |
8ccc31eb | 4078 | arg = convert (boolean_type_node, arg); |
8d08fdba | 4079 | val = invert_truthvalue (arg); |
2986ae00 MS |
4080 | if (arg != error_mark_node) |
4081 | return val; | |
4082 | errstring = "in argument to unary !"; | |
8d08fdba MS |
4083 | break; |
4084 | ||
4085 | case NOP_EXPR: | |
4086 | break; | |
4087 | ||
4088 | case PREINCREMENT_EXPR: | |
4089 | case POSTINCREMENT_EXPR: | |
4090 | case PREDECREMENT_EXPR: | |
4091 | case POSTDECREMENT_EXPR: | |
4092 | /* Handle complex lvalues (when permitted) | |
4093 | by reduction to simpler cases. */ | |
4094 | ||
4095 | val = unary_complex_lvalue (code, arg); | |
4096 | if (val != 0) | |
4097 | return val; | |
4098 | ||
4099 | /* Report invalid types. */ | |
4100 | ||
b7484fbe MS |
4101 | if (!(arg = build_expr_type_conversion (WANT_ARITH | WANT_POINTER, |
4102 | arg, 1))) | |
8d08fdba MS |
4103 | { |
4104 | if (code == PREINCREMENT_EXPR) | |
4105 | errstring ="no pre-increment operator for type"; | |
4106 | else if (code == POSTINCREMENT_EXPR) | |
4107 | errstring ="no post-increment operator for type"; | |
4108 | else if (code == PREDECREMENT_EXPR) | |
4109 | errstring ="no pre-decrement operator for type"; | |
4110 | else | |
4111 | errstring ="no post-decrement operator for type"; | |
4112 | break; | |
4113 | } | |
4114 | ||
4115 | /* Report something read-only. */ | |
4116 | ||
4117 | if (TYPE_READONLY (TREE_TYPE (arg)) | |
4118 | || TREE_READONLY (arg)) | |
4119 | readonly_error (arg, ((code == PREINCREMENT_EXPR | |
4120 | || code == POSTINCREMENT_EXPR) | |
4121 | ? "increment" : "decrement"), | |
4122 | 0); | |
4123 | ||
4124 | { | |
4125 | register tree inc; | |
4126 | tree result_type = TREE_TYPE (arg); | |
4127 | ||
4128 | arg = get_unwidened (arg, 0); | |
4129 | argtype = TREE_TYPE (arg); | |
4130 | ||
4131 | /* ARM $5.2.5 last annotation says this should be forbidden. */ | |
4132 | if (TREE_CODE (argtype) == ENUMERAL_TYPE) | |
4133 | pedwarn ("ANSI C++ forbids %sing an enum", | |
4134 | (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR) | |
4135 | ? "increment" : "decrement"); | |
4136 | ||
4137 | /* Compute the increment. */ | |
4138 | ||
b7484fbe | 4139 | if (TREE_CODE (argtype) == POINTER_TYPE) |
8d08fdba MS |
4140 | { |
4141 | enum tree_code tmp = TREE_CODE (TREE_TYPE (argtype)); | |
5566b478 | 4142 | if (TYPE_SIZE (complete_type (TREE_TYPE (argtype))) == 0) |
39211cd5 MS |
4143 | cp_error ("cannot %s a pointer to incomplete type `%T'", |
4144 | ((code == PREINCREMENT_EXPR | |
4145 | || code == POSTINCREMENT_EXPR) | |
4146 | ? "increment" : "decrement"), TREE_TYPE (argtype)); | |
4147 | else if (tmp == FUNCTION_TYPE || tmp == METHOD_TYPE | |
4148 | || tmp == VOID_TYPE || tmp == OFFSET_TYPE) | |
8d08fdba | 4149 | cp_pedwarn ("ANSI C++ forbids %sing a pointer of type `%T'", |
39211cd5 MS |
4150 | ((code == PREINCREMENT_EXPR |
4151 | || code == POSTINCREMENT_EXPR) | |
4152 | ? "increment" : "decrement"), argtype); | |
8d08fdba MS |
4153 | inc = c_sizeof_nowarn (TREE_TYPE (argtype)); |
4154 | } | |
4155 | else | |
4156 | inc = integer_one_node; | |
4157 | ||
4158 | inc = convert (argtype, inc); | |
4159 | ||
4160 | /* Handle incrementing a cast-expression. */ | |
4161 | ||
4162 | switch (TREE_CODE (arg)) | |
4163 | { | |
4164 | case NOP_EXPR: | |
4165 | case CONVERT_EXPR: | |
4166 | case FLOAT_EXPR: | |
4167 | case FIX_TRUNC_EXPR: | |
4168 | case FIX_FLOOR_EXPR: | |
4169 | case FIX_ROUND_EXPR: | |
4170 | case FIX_CEIL_EXPR: | |
4171 | { | |
72b7eeff | 4172 | tree incremented, modify, value, compound; |
f0e01782 MS |
4173 | if (! lvalue_p (arg) && pedantic) |
4174 | pedwarn ("cast to non-reference type used as lvalue"); | |
8d08fdba MS |
4175 | arg = stabilize_reference (arg); |
4176 | if (code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4177 | value = arg; | |
4178 | else | |
4179 | value = save_expr (arg); | |
4180 | incremented = build (((code == PREINCREMENT_EXPR | |
4181 | || code == POSTINCREMENT_EXPR) | |
4182 | ? PLUS_EXPR : MINUS_EXPR), | |
4183 | argtype, value, inc); | |
4184 | TREE_SIDE_EFFECTS (incremented) = 1; | |
72b7eeff | 4185 | |
8d08fdba | 4186 | modify = build_modify_expr (arg, NOP_EXPR, incremented); |
72b7eeff MS |
4187 | compound = build (COMPOUND_EXPR, TREE_TYPE (arg), modify, value); |
4188 | ||
e92cc029 | 4189 | /* Eliminate warning about unused result of + or -. */ |
72b7eeff MS |
4190 | TREE_NO_UNUSED_WARNING (compound) = 1; |
4191 | return compound; | |
8d08fdba MS |
4192 | } |
4193 | } | |
4194 | ||
8d08fdba MS |
4195 | /* Complain about anything else that is not a true lvalue. */ |
4196 | if (!lvalue_or_else (arg, ((code == PREINCREMENT_EXPR | |
4197 | || code == POSTINCREMENT_EXPR) | |
4198 | ? "increment" : "decrement"))) | |
4199 | return error_mark_node; | |
4200 | ||
b7484fbe MS |
4201 | /* Forbid using -- on `bool'. */ |
4202 | if (TREE_TYPE (arg) == boolean_type_node) | |
4203 | { | |
4204 | if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR) | |
4205 | { | |
4206 | cp_error ("invalid use of `--' on bool variable `%D'", arg); | |
4207 | return error_mark_node; | |
4208 | } | |
4209 | #if 0 | |
4210 | /* This will only work if someone can convince Kenner to accept | |
4211 | my patch to expand_increment. (jason) */ | |
4212 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4213 | #else | |
4214 | if (code == POSTINCREMENT_EXPR) | |
4215 | { | |
4216 | arg = stabilize_reference (arg); | |
4217 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4218 | boolean_true_node); | |
4219 | TREE_SIDE_EFFECTS (val) = 1; | |
4220 | arg = save_expr (arg); | |
4221 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
4222 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4223 | } | |
4224 | else | |
4225 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
4226 | boolean_true_node); | |
4227 | #endif | |
4228 | } | |
4229 | else | |
4230 | val = build (code, TREE_TYPE (arg), arg, inc); | |
4231 | ||
8d08fdba MS |
4232 | TREE_SIDE_EFFECTS (val) = 1; |
4233 | return convert (result_type, val); | |
4234 | } | |
4235 | ||
4236 | case ADDR_EXPR: | |
4237 | /* Note that this operation never does default_conversion | |
4238 | regardless of NOCONVERT. */ | |
4239 | ||
b7484fbe MS |
4240 | argtype = TREE_TYPE (arg); |
4241 | if (TREE_CODE (argtype) == REFERENCE_TYPE) | |
8d08fdba MS |
4242 | { |
4243 | arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
4244 | TREE_REFERENCE_EXPR (arg) = 1; | |
4245 | return arg; | |
4246 | } | |
a0a33927 MS |
4247 | else if (pedantic |
4248 | && TREE_CODE (arg) == FUNCTION_DECL | |
8d08fdba MS |
4249 | && DECL_NAME (arg) |
4250 | && DECL_CONTEXT (arg) == NULL_TREE | |
4251 | && IDENTIFIER_LENGTH (DECL_NAME (arg)) == 4 | |
4252 | && IDENTIFIER_POINTER (DECL_NAME (arg))[0] == 'm' | |
4253 | && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (arg)), "main")) | |
a0a33927 MS |
4254 | /* ARM $3.4 */ |
4255 | pedwarn ("taking address of function `main'"); | |
8d08fdba MS |
4256 | |
4257 | /* Let &* cancel out to simplify resulting code. */ | |
4258 | if (TREE_CODE (arg) == INDIRECT_REF) | |
4259 | { | |
4ac14744 | 4260 | /* We don't need to have `current_class_ptr' wrapped in a |
8d08fdba | 4261 | NON_LVALUE_EXPR node. */ |
4ac14744 MS |
4262 | if (arg == current_class_ref) |
4263 | return current_class_ptr; | |
8d08fdba MS |
4264 | |
4265 | /* Keep `default_conversion' from converting if | |
4266 | ARG is of REFERENCE_TYPE. */ | |
4267 | arg = TREE_OPERAND (arg, 0); | |
4268 | if (TREE_CODE (TREE_TYPE (arg)) == REFERENCE_TYPE) | |
4269 | { | |
4270 | if (TREE_CODE (arg) == VAR_DECL && DECL_INITIAL (arg) | |
4271 | && !TREE_SIDE_EFFECTS (DECL_INITIAL (arg))) | |
4272 | arg = DECL_INITIAL (arg); | |
4273 | arg = build1 (CONVERT_EXPR, build_pointer_type (TREE_TYPE (TREE_TYPE (arg))), arg); | |
4274 | TREE_REFERENCE_EXPR (arg) = 1; | |
4275 | TREE_CONSTANT (arg) = TREE_CONSTANT (TREE_OPERAND (arg, 0)); | |
4276 | } | |
4277 | else if (lvalue_p (arg)) | |
4278 | /* Don't let this be an lvalue. */ | |
4279 | return non_lvalue (arg); | |
4280 | return arg; | |
4281 | } | |
4282 | ||
4283 | /* For &x[y], return x+y */ | |
4284 | if (TREE_CODE (arg) == ARRAY_REF) | |
4285 | { | |
4286 | if (mark_addressable (TREE_OPERAND (arg, 0)) == 0) | |
4287 | return error_mark_node; | |
4288 | return build_binary_op (PLUS_EXPR, TREE_OPERAND (arg, 0), | |
4289 | TREE_OPERAND (arg, 1), 1); | |
4290 | } | |
4291 | ||
8d08fdba MS |
4292 | /* Uninstantiated types are all functions. Taking the |
4293 | address of a function is a no-op, so just return the | |
4294 | argument. */ | |
4295 | ||
4296 | if (TREE_CODE (arg) == IDENTIFIER_NODE | |
4297 | && IDENTIFIER_OPNAME_P (arg)) | |
4298 | { | |
4299 | my_friendly_abort (117); | |
4300 | /* We don't know the type yet, so just work around the problem. | |
4301 | We know that this will resolve to an lvalue. */ | |
4302 | return build1 (ADDR_EXPR, unknown_type_node, arg); | |
4303 | } | |
4304 | ||
4305 | if (TREE_CODE (arg) == TREE_LIST) | |
4306 | { | |
f376e137 MS |
4307 | if (TREE_CODE (TREE_VALUE (arg)) == FUNCTION_DECL |
4308 | && DECL_CHAIN (TREE_VALUE (arg)) == NULL_TREE) | |
4309 | /* Unique overloaded non-member function. */ | |
4310 | return build_unary_op (ADDR_EXPR, TREE_VALUE (arg), 0); | |
8d08fdba MS |
4311 | if (TREE_CHAIN (arg) == NULL_TREE |
4312 | && TREE_CODE (TREE_VALUE (arg)) == TREE_LIST | |
4313 | && DECL_CHAIN (TREE_VALUE (TREE_VALUE (arg))) == NULL_TREE) | |
f376e137 MS |
4314 | /* Unique overloaded member function. */ |
4315 | return build_unary_op (ADDR_EXPR, TREE_VALUE (TREE_VALUE (arg)), | |
4316 | 0); | |
8d08fdba MS |
4317 | return build1 (ADDR_EXPR, unknown_type_node, arg); |
4318 | } | |
4319 | ||
4320 | /* Handle complex lvalues (when permitted) | |
4321 | by reduction to simpler cases. */ | |
4322 | val = unary_complex_lvalue (code, arg); | |
4323 | if (val != 0) | |
4324 | return val; | |
4325 | ||
8d08fdba MS |
4326 | switch (TREE_CODE (arg)) |
4327 | { | |
4328 | case NOP_EXPR: | |
4329 | case CONVERT_EXPR: | |
4330 | case FLOAT_EXPR: | |
4331 | case FIX_TRUNC_EXPR: | |
4332 | case FIX_FLOOR_EXPR: | |
4333 | case FIX_ROUND_EXPR: | |
4334 | case FIX_CEIL_EXPR: | |
f0e01782 MS |
4335 | if (! lvalue_p (arg) && pedantic) |
4336 | pedwarn ("taking the address of a cast to non-reference type"); | |
8d08fdba | 4337 | } |
8d08fdba MS |
4338 | |
4339 | /* Allow the address of a constructor if all the elements | |
4340 | are constant. */ | |
4341 | if (TREE_CODE (arg) == CONSTRUCTOR && TREE_CONSTANT (arg)) | |
4342 | ; | |
4343 | /* Anything not already handled and not a true memory reference | |
4344 | is an error. */ | |
b7484fbe MS |
4345 | else if (TREE_CODE (argtype) != FUNCTION_TYPE |
4346 | && TREE_CODE (argtype) != METHOD_TYPE | |
8d08fdba MS |
4347 | && !lvalue_or_else (arg, "unary `&'")) |
4348 | return error_mark_node; | |
4349 | ||
4350 | /* Ordinary case; arg is a COMPONENT_REF or a decl. */ | |
8d08fdba MS |
4351 | /* If the lvalue is const or volatile, |
4352 | merge that into the type that the address will point to. */ | |
4353 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'd' | |
4354 | || TREE_CODE_CLASS (TREE_CODE (arg)) == 'r') | |
4355 | { | |
4356 | if (TREE_READONLY (arg) || TREE_THIS_VOLATILE (arg)) | |
f376e137 | 4357 | argtype = cp_build_type_variant (argtype, |
21474714 MS |
4358 | TREE_READONLY (arg), |
4359 | TREE_THIS_VOLATILE (arg)); | |
8d08fdba MS |
4360 | } |
4361 | ||
4362 | argtype = build_pointer_type (argtype); | |
4363 | ||
4364 | if (mark_addressable (arg) == 0) | |
4365 | return error_mark_node; | |
4366 | ||
4367 | { | |
4368 | tree addr; | |
4369 | ||
4370 | if (TREE_CODE (arg) == COMPONENT_REF) | |
4371 | addr = build_component_addr (arg, argtype, | |
4372 | "attempt to take address of bit-field structure member `%s'"); | |
4373 | else | |
4374 | addr = build1 (code, argtype, arg); | |
4375 | ||
4376 | /* Address of a static or external variable or | |
4377 | function counts as a constant */ | |
4378 | if (staticp (arg)) | |
4379 | TREE_CONSTANT (addr) = 1; | |
4ac14744 MS |
4380 | |
4381 | if (TREE_CODE (argtype) == POINTER_TYPE && | |
4382 | TREE_CODE (TREE_TYPE (argtype)) == METHOD_TYPE) | |
4383 | { | |
4384 | build_ptrmemfunc_type (argtype); | |
4385 | addr = build_ptrmemfunc (argtype, addr, 0); | |
4386 | } | |
4387 | ||
8d08fdba MS |
4388 | return addr; |
4389 | } | |
4390 | } | |
4391 | ||
4392 | if (!errstring) | |
4393 | { | |
4394 | if (argtype == 0) | |
4395 | argtype = TREE_TYPE (arg); | |
4396 | return fold (build1 (code, argtype, arg)); | |
4397 | } | |
4398 | ||
4399 | error (errstring); | |
4400 | return error_mark_node; | |
4401 | } | |
4402 | ||
cffa8729 | 4403 | #if 0 |
8d08fdba MS |
4404 | /* If CONVERSIONS is a conversion expression or a nested sequence of such, |
4405 | convert ARG with the same conversions in the same order | |
4406 | and return the result. */ | |
4407 | ||
4408 | static tree | |
4409 | convert_sequence (conversions, arg) | |
4410 | tree conversions; | |
4411 | tree arg; | |
4412 | { | |
4413 | switch (TREE_CODE (conversions)) | |
4414 | { | |
4415 | case NOP_EXPR: | |
4416 | case CONVERT_EXPR: | |
4417 | case FLOAT_EXPR: | |
4418 | case FIX_TRUNC_EXPR: | |
4419 | case FIX_FLOOR_EXPR: | |
4420 | case FIX_ROUND_EXPR: | |
4421 | case FIX_CEIL_EXPR: | |
4422 | return convert (TREE_TYPE (conversions), | |
4423 | convert_sequence (TREE_OPERAND (conversions, 0), | |
4424 | arg)); | |
4425 | ||
4426 | default: | |
4427 | return arg; | |
4428 | } | |
4429 | } | |
cffa8729 | 4430 | #endif |
8d08fdba MS |
4431 | |
4432 | /* Apply unary lvalue-demanding operator CODE to the expression ARG | |
4433 | for certain kinds of expressions which are not really lvalues | |
4434 | but which we can accept as lvalues. | |
4435 | ||
4436 | If ARG is not a kind of expression we can handle, return zero. */ | |
4437 | ||
4438 | tree | |
4439 | unary_complex_lvalue (code, arg) | |
4440 | enum tree_code code; | |
4441 | tree arg; | |
4442 | { | |
4443 | /* Handle (a, b) used as an "lvalue". */ | |
4444 | if (TREE_CODE (arg) == COMPOUND_EXPR) | |
4445 | { | |
4446 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 1), 0); | |
8d08fdba MS |
4447 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), |
4448 | TREE_OPERAND (arg, 0), real_result); | |
4449 | } | |
4450 | ||
4451 | /* Handle (a ? b : c) used as an "lvalue". */ | |
4452 | if (TREE_CODE (arg) == COND_EXPR) | |
a4443a08 MS |
4453 | return rationalize_conditional_expr (code, arg); |
4454 | ||
e1cd6e56 MS |
4455 | if (TREE_CODE (arg) == MODIFY_EXPR |
4456 | || TREE_CODE (arg) == PREINCREMENT_EXPR | |
4457 | || TREE_CODE (arg) == PREDECREMENT_EXPR) | |
a4443a08 MS |
4458 | return unary_complex_lvalue |
4459 | (code, build (COMPOUND_EXPR, TREE_TYPE (TREE_OPERAND (arg, 0)), | |
4460 | arg, TREE_OPERAND (arg, 0))); | |
8d08fdba MS |
4461 | |
4462 | if (code != ADDR_EXPR) | |
4463 | return 0; | |
4464 | ||
4465 | /* Handle (a = b) used as an "lvalue" for `&'. */ | |
4466 | if (TREE_CODE (arg) == MODIFY_EXPR | |
4467 | || TREE_CODE (arg) == INIT_EXPR) | |
4468 | { | |
4469 | tree real_result = build_unary_op (code, TREE_OPERAND (arg, 0), 0); | |
4470 | return build (COMPOUND_EXPR, TREE_TYPE (real_result), arg, real_result); | |
4471 | } | |
4472 | ||
8d08fdba MS |
4473 | if (TREE_CODE (TREE_TYPE (arg)) == FUNCTION_TYPE |
4474 | || TREE_CODE (TREE_TYPE (arg)) == METHOD_TYPE | |
4475 | || TREE_CODE (TREE_TYPE (arg)) == OFFSET_TYPE) | |
4476 | { | |
4477 | /* The representation of something of type OFFSET_TYPE | |
4478 | is really the representation of a pointer to it. | |
4479 | Here give the representation its true type. */ | |
4480 | tree t; | |
4481 | tree offset; | |
4482 | ||
4483 | my_friendly_assert (TREE_CODE (arg) != SCOPE_REF, 313); | |
4484 | ||
4485 | if (TREE_CODE (arg) != OFFSET_REF) | |
4486 | return 0; | |
4487 | ||
4488 | t = TREE_OPERAND (arg, 1); | |
4489 | ||
e92cc029 | 4490 | if (TREE_CODE (t) == FUNCTION_DECL) /* Check all this code for right semantics. */ |
8d08fdba MS |
4491 | return build_unary_op (ADDR_EXPR, t, 0); |
4492 | if (TREE_CODE (t) == VAR_DECL) | |
4493 | return build_unary_op (ADDR_EXPR, t, 0); | |
4494 | else | |
4495 | { | |
8d08fdba MS |
4496 | if (TREE_OPERAND (arg, 0) |
4497 | && (TREE_CODE (TREE_OPERAND (arg, 0)) != NOP_EXPR | |
4498 | || TREE_OPERAND (TREE_OPERAND (arg, 0), 0) != error_mark_node)) | |
8145f082 MS |
4499 | if (TREE_CODE (t) != FIELD_DECL) |
4500 | { | |
4501 | /* Don't know if this should return address to just | |
4502 | _DECL, or actual address resolved in this expression. */ | |
4503 | sorry ("address of bound pointer-to-member expression"); | |
4504 | return error_mark_node; | |
4505 | } | |
8d08fdba | 4506 | |
c91a56d2 | 4507 | /* Add in the offset to the right subobject. */ |
8145f082 MS |
4508 | offset = get_delta_difference (DECL_FIELD_CONTEXT (t), |
4509 | TREE_TYPE (TREE_OPERAND (arg, 0)), | |
4510 | 0); | |
c91a56d2 MS |
4511 | |
4512 | /* Add in the offset to the field. */ | |
8145f082 MS |
4513 | offset = size_binop (PLUS_EXPR, offset, |
4514 | size_binop (EASY_DIV_EXPR, | |
4515 | DECL_FIELD_BITPOS (t), | |
4516 | size_int (BITS_PER_UNIT))); | |
c91a56d2 MS |
4517 | |
4518 | /* We offset all pointer to data memebers by 1 so that we can | |
4519 | distinguish between a null pointer to data member and the first | |
4520 | data member of a structure. */ | |
4521 | offset = size_binop (PLUS_EXPR, offset, size_int (1)); | |
4522 | ||
8145f082 | 4523 | return convert (build_pointer_type (TREE_TYPE (arg)), offset); |
8d08fdba MS |
4524 | } |
4525 | } | |
4526 | ||
c91a56d2 | 4527 | |
8d08fdba MS |
4528 | /* We permit compiler to make function calls returning |
4529 | objects of aggregate type look like lvalues. */ | |
4530 | { | |
4531 | tree targ = arg; | |
4532 | ||
4533 | if (TREE_CODE (targ) == SAVE_EXPR) | |
4534 | targ = TREE_OPERAND (targ, 0); | |
4535 | ||
4536 | if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (TREE_TYPE (targ))) | |
4537 | { | |
4538 | if (TREE_CODE (arg) == SAVE_EXPR) | |
4539 | targ = arg; | |
4540 | else | |
5566b478 | 4541 | targ = build_cplus_new (TREE_TYPE (arg), arg); |
f30432d7 | 4542 | return build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (arg)), targ); |
8d08fdba MS |
4543 | } |
4544 | ||
4545 | if (TREE_CODE (arg) == SAVE_EXPR && TREE_CODE (targ) == INDIRECT_REF) | |
f30432d7 | 4546 | return build (SAVE_EXPR, build_pointer_type (TREE_TYPE (arg)), |
8d08fdba | 4547 | TREE_OPERAND (targ, 0), current_function_decl, NULL); |
8d08fdba MS |
4548 | } |
4549 | ||
4550 | /* Don't let anything else be handled specially. */ | |
4551 | return 0; | |
4552 | } | |
8d08fdba MS |
4553 | \f |
4554 | /* Mark EXP saying that we need to be able to take the | |
4555 | address of it; it should not be allocated in a register. | |
4556 | Value is 1 if successful. | |
4557 | ||
4ac14744 | 4558 | C++: we do not allow `current_class_ptr' to be addressable. */ |
8d08fdba MS |
4559 | |
4560 | int | |
4561 | mark_addressable (exp) | |
4562 | tree exp; | |
4563 | { | |
4564 | register tree x = exp; | |
4565 | ||
4566 | if (TREE_ADDRESSABLE (x) == 1) | |
4567 | return 1; | |
4568 | ||
4569 | while (1) | |
4570 | switch (TREE_CODE (x)) | |
4571 | { | |
4572 | case ADDR_EXPR: | |
4573 | case COMPONENT_REF: | |
4574 | case ARRAY_REF: | |
4575 | x = TREE_OPERAND (x, 0); | |
4576 | break; | |
4577 | ||
4578 | case PARM_DECL: | |
4ac14744 | 4579 | if (x == current_class_ptr) |
8d08fdba MS |
4580 | { |
4581 | error ("address of `this' not available"); | |
4582 | TREE_ADDRESSABLE (x) = 1; /* so compiler doesn't die later */ | |
4583 | put_var_into_stack (x); | |
4584 | return 1; | |
4585 | } | |
4586 | case VAR_DECL: | |
cffa8729 | 4587 | if (TREE_STATIC (x) && TREE_READONLY (x) |
8d08fdba | 4588 | && DECL_RTL (x) != 0 |
cffa8729 | 4589 | && ! DECL_IN_MEMORY_P (x)) |
8d08fdba MS |
4590 | { |
4591 | /* We thought this would make a good constant variable, | |
4592 | but we were wrong. */ | |
4593 | push_obstacks_nochange (); | |
4594 | end_temporary_allocation (); | |
4595 | ||
4596 | TREE_ASM_WRITTEN (x) = 0; | |
4597 | DECL_RTL (x) = 0; | |
4598 | rest_of_decl_compilation (x, 0, IDENTIFIER_LOCAL_VALUE (x) == 0, 0); | |
4599 | TREE_ADDRESSABLE (x) = 1; | |
4600 | ||
4601 | pop_obstacks (); | |
4602 | ||
4603 | return 1; | |
4604 | } | |
4605 | /* Caller should not be trying to mark initialized | |
4606 | constant fields addressable. */ | |
4607 | my_friendly_assert (DECL_LANG_SPECIFIC (x) == 0 | |
4608 | || DECL_IN_AGGR_P (x) == 0 | |
4609 | || TREE_STATIC (x) | |
4610 | || DECL_EXTERNAL (x), 314); | |
4611 | ||
4612 | case CONST_DECL: | |
4613 | case RESULT_DECL: | |
4614 | /* For C++, we don't warn about taking the address of a register | |
4615 | variable for CONST_DECLs; ARM p97 explicitly says it's okay. */ | |
4616 | put_var_into_stack (x); | |
4617 | TREE_ADDRESSABLE (x) = 1; | |
4618 | return 1; | |
4619 | ||
4620 | case FUNCTION_DECL: | |
4621 | /* We have to test both conditions here. The first may | |
4622 | be non-zero in the case of processing a default function. | |
4623 | The second may be non-zero in the case of a template function. */ | |
4624 | x = DECL_MAIN_VARIANT (x); | |
faae18ab | 4625 | if ((DECL_THIS_INLINE (x) || DECL_PENDING_INLINE_INFO (x)) |
8d08fdba MS |
4626 | && (DECL_CONTEXT (x) == NULL_TREE |
4627 | || TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (x))) != 't' | |
4628 | || ! CLASSTYPE_INTERFACE_ONLY (DECL_CONTEXT (x)))) | |
4629 | { | |
4630 | mark_inline_for_output (x); | |
4631 | if (x == current_function_decl) | |
4632 | DECL_EXTERNAL (x) = 0; | |
4633 | } | |
4634 | TREE_ADDRESSABLE (x) = 1; | |
4635 | TREE_USED (x) = 1; | |
4636 | TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (x)) = 1; | |
4637 | return 1; | |
4638 | ||
e92cc029 MS |
4639 | case CONSTRUCTOR: |
4640 | TREE_ADDRESSABLE (x) = 1; | |
4641 | return 1; | |
4642 | ||
8d08fdba MS |
4643 | default: |
4644 | return 1; | |
4645 | } | |
4646 | } | |
4647 | \f | |
4648 | /* Build and return a conditional expression IFEXP ? OP1 : OP2. */ | |
4649 | ||
4650 | tree | |
4651 | build_x_conditional_expr (ifexp, op1, op2) | |
4652 | tree ifexp, op1, op2; | |
4653 | { | |
4654 | tree rval = NULL_TREE; | |
4655 | ||
5566b478 MS |
4656 | if (current_template_parms) |
4657 | return build_min_nt (COND_EXPR, ifexp, op1, op2); | |
4658 | ||
c73964b2 MS |
4659 | if (flag_ansi_overloading) |
4660 | return build_new_op (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); | |
4661 | ||
8d08fdba MS |
4662 | /* See comments in `build_x_binary_op'. */ |
4663 | if (op1 != 0) | |
4664 | rval = build_opfncall (COND_EXPR, LOOKUP_SPECULATIVELY, ifexp, op1, op2); | |
4665 | if (rval) | |
4666 | return build_opfncall (COND_EXPR, LOOKUP_NORMAL, ifexp, op1, op2); | |
4667 | ||
4668 | return build_conditional_expr (ifexp, op1, op2); | |
4669 | } | |
4670 | ||
4671 | tree | |
4672 | build_conditional_expr (ifexp, op1, op2) | |
4673 | tree ifexp, op1, op2; | |
4674 | { | |
4675 | register tree type1; | |
4676 | register tree type2; | |
4677 | register enum tree_code code1; | |
4678 | register enum tree_code code2; | |
4679 | register tree result_type = NULL_TREE; | |
4680 | tree orig_op1 = op1, orig_op2 = op2; | |
4681 | ||
4682 | /* If second operand is omitted, it is the same as the first one; | |
4683 | make sure it is calculated only once. */ | |
4684 | if (op1 == 0) | |
4685 | { | |
4686 | if (pedantic) | |
4687 | pedwarn ("ANSI C++ forbids omitting the middle term of a ?: expression"); | |
4688 | ifexp = op1 = save_expr (ifexp); | |
4689 | } | |
4690 | ||
1743ca29 | 4691 | ifexp = convert (boolean_type_node, ifexp); |
8d08fdba MS |
4692 | |
4693 | if (TREE_CODE (ifexp) == ERROR_MARK) | |
4694 | return error_mark_node; | |
4695 | ||
4696 | op1 = require_instantiated_type (TREE_TYPE (op2), op1, error_mark_node); | |
4697 | if (op1 == error_mark_node) | |
4698 | return error_mark_node; | |
4699 | op2 = require_instantiated_type (TREE_TYPE (op1), op2, error_mark_node); | |
4700 | if (op2 == error_mark_node) | |
4701 | return error_mark_node; | |
4702 | ||
4703 | /* C++: REFERENCE_TYPES must be dereferenced. */ | |
4704 | type1 = TREE_TYPE (op1); | |
4705 | code1 = TREE_CODE (type1); | |
4706 | type2 = TREE_TYPE (op2); | |
4707 | code2 = TREE_CODE (type2); | |
4708 | ||
4709 | if (code1 == REFERENCE_TYPE) | |
4710 | { | |
4711 | op1 = convert_from_reference (op1); | |
4712 | type1 = TREE_TYPE (op1); | |
4713 | code1 = TREE_CODE (type1); | |
4714 | } | |
4715 | if (code2 == REFERENCE_TYPE) | |
4716 | { | |
4717 | op2 = convert_from_reference (op2); | |
4718 | type2 = TREE_TYPE (op2); | |
4719 | code2 = TREE_CODE (type2); | |
4720 | } | |
4721 | ||
8d08fdba MS |
4722 | /* Don't promote the operands separately if they promote |
4723 | the same way. Return the unpromoted type and let the combined | |
4724 | value get promoted if necessary. */ | |
4725 | ||
4726 | if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2) | |
4727 | && code2 != ARRAY_TYPE | |
8d08fdba MS |
4728 | && code2 != FUNCTION_TYPE |
4729 | && code2 != METHOD_TYPE) | |
4730 | { | |
4731 | tree result; | |
4732 | ||
4733 | if (TREE_CONSTANT (ifexp) | |
4734 | && (TREE_CODE (ifexp) == INTEGER_CST | |
4735 | || TREE_CODE (ifexp) == ADDR_EXPR)) | |
4736 | return (integer_zerop (ifexp) ? op2 : op1); | |
4737 | ||
4738 | if (TREE_CODE (op1) == CONST_DECL) | |
4739 | op1 = DECL_INITIAL (op1); | |
4740 | else if (TREE_READONLY_DECL_P (op1)) | |
4741 | op1 = decl_constant_value (op1); | |
4742 | if (TREE_CODE (op2) == CONST_DECL) | |
4743 | op2 = DECL_INITIAL (op2); | |
4744 | else if (TREE_READONLY_DECL_P (op2)) | |
4745 | op2 = decl_constant_value (op2); | |
4746 | if (type1 != type2) | |
f376e137 | 4747 | type1 = cp_build_type_variant |
8d08fdba MS |
4748 | (type1, |
4749 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4750 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4751 | /* ??? This is a kludge to deal with the fact that | |
4752 | we don't sort out integers and enums properly, yet. */ | |
4753 | result = fold (build (COND_EXPR, type1, ifexp, op1, op2)); | |
4754 | if (TREE_TYPE (result) != type1) | |
4755 | result = build1 (NOP_EXPR, type1, result); | |
c73964b2 MS |
4756 | /* Expand both sides into the same slot, |
4757 | hopefully the target of the ?: expression. */ | |
4758 | if (TREE_CODE (op1) == TARGET_EXPR && TREE_CODE (op2) == TARGET_EXPR) | |
4759 | { | |
4760 | tree slot = build (VAR_DECL, TREE_TYPE (result)); | |
4761 | layout_decl (slot, 0); | |
4762 | result = build (TARGET_EXPR, TREE_TYPE (result), | |
4763 | slot, result, NULL_TREE, NULL_TREE); | |
4764 | } | |
8d08fdba MS |
4765 | return result; |
4766 | } | |
8d08fdba MS |
4767 | |
4768 | /* They don't match; promote them both and then try to reconcile them. | |
4769 | But don't permit mismatching enum types. */ | |
4770 | if (code1 == ENUMERAL_TYPE) | |
4771 | { | |
4772 | if (code2 == ENUMERAL_TYPE) | |
4773 | { | |
71851aaa | 4774 | cp_error ("enumeral mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
4775 | return error_mark_node; |
4776 | } | |
b19b4a78 MS |
4777 | else if (extra_warnings && ! IS_AGGR_TYPE_CODE (code2) |
4778 | && type2 != type_promotes_to (type1)) | |
8d08fdba MS |
4779 | warning ("enumeral and non-enumeral type in conditional expression"); |
4780 | } | |
4781 | else if (extra_warnings | |
b19b4a78 MS |
4782 | && code2 == ENUMERAL_TYPE && ! IS_AGGR_TYPE_CODE (code1) |
4783 | && type1 != type_promotes_to (type2)) | |
8d08fdba MS |
4784 | warning ("enumeral and non-enumeral type in conditional expression"); |
4785 | ||
4786 | if (code1 != VOID_TYPE) | |
4787 | { | |
4788 | op1 = default_conversion (op1); | |
4789 | type1 = TREE_TYPE (op1); | |
71851aaa MS |
4790 | if (TYPE_PTRMEMFUNC_P (type1)) |
4791 | type1 = TYPE_PTRMEMFUNC_FN_TYPE (type1); | |
8d08fdba MS |
4792 | code1 = TREE_CODE (type1); |
4793 | } | |
4794 | if (code2 != VOID_TYPE) | |
4795 | { | |
4796 | op2 = default_conversion (op2); | |
4797 | type2 = TREE_TYPE (op2); | |
71851aaa MS |
4798 | if (TYPE_PTRMEMFUNC_P (type2)) |
4799 | type2 = TYPE_PTRMEMFUNC_FN_TYPE (type2); | |
8d08fdba MS |
4800 | code2 = TREE_CODE (type2); |
4801 | } | |
4802 | ||
a5894242 MS |
4803 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE |
4804 | && real_lvalue_p (op1) && real_lvalue_p (op2) | |
4805 | && comptypes (type1, type2, -1)) | |
4806 | { | |
4807 | type1 = build_reference_type (type1); | |
4808 | type2 = build_reference_type (type2); | |
4809 | result_type = common_type (type1, type2); | |
4810 | op1 = convert_to_reference (result_type, op1, CONV_IMPLICIT, | |
4811 | LOOKUP_NORMAL, NULL_TREE); | |
4812 | op2 = convert_to_reference (result_type, op2, CONV_IMPLICIT, | |
4813 | LOOKUP_NORMAL, NULL_TREE); | |
4814 | } | |
8d08fdba MS |
4815 | /* Quickly detect the usual case where op1 and op2 have the same type |
4816 | after promotion. */ | |
a5894242 | 4817 | else if (TYPE_MAIN_VARIANT (type1) == TYPE_MAIN_VARIANT (type2)) |
8d08fdba MS |
4818 | { |
4819 | if (type1 == type2) | |
4820 | result_type = type1; | |
4821 | else | |
f376e137 | 4822 | result_type = cp_build_type_variant |
8d08fdba MS |
4823 | (type1, |
4824 | TREE_READONLY (op1) || TREE_READONLY (op2), | |
4825 | TREE_THIS_VOLATILE (op1) || TREE_THIS_VOLATILE (op2)); | |
4826 | } | |
4827 | else if ((code1 == INTEGER_TYPE || code1 == REAL_TYPE) | |
4828 | && (code2 == INTEGER_TYPE || code2 == REAL_TYPE)) | |
4829 | { | |
4830 | result_type = common_type (type1, type2); | |
4831 | } | |
4832 | else if (code1 == VOID_TYPE || code2 == VOID_TYPE) | |
4833 | { | |
4834 | if (pedantic && (code1 != VOID_TYPE || code2 != VOID_TYPE)) | |
4835 | pedwarn ("ANSI C++ forbids conditional expr with only one void side"); | |
4836 | result_type = void_type_node; | |
4837 | } | |
d11ad92e MS |
4838 | else if (code1 == POINTER_TYPE && null_ptr_cst_p (op2)) |
4839 | result_type = qualify_type (type1, type2); | |
4840 | else if (code2 == POINTER_TYPE && null_ptr_cst_p (op1)) | |
4841 | result_type = qualify_type (type2, type1); | |
8d08fdba MS |
4842 | else if (code1 == POINTER_TYPE && code2 == POINTER_TYPE) |
4843 | { | |
4844 | if (comp_target_types (type1, type2, 1)) | |
4845 | result_type = common_type (type1, type2); | |
8d08fdba MS |
4846 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type1)) == void_type_node) |
4847 | { | |
4848 | if (pedantic && TREE_CODE (type2) == FUNCTION_TYPE) | |
4849 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
4850 | result_type = qualify_type (type1, type2); | |
4851 | } | |
4852 | else if (TYPE_MAIN_VARIANT (TREE_TYPE (type2)) == void_type_node) | |
4853 | { | |
4854 | if (pedantic && TREE_CODE (type1) == FUNCTION_TYPE) | |
4855 | pedwarn ("ANSI C++ forbids conditional expr between `void *' and function pointer"); | |
4856 | result_type = qualify_type (type2, type1); | |
4857 | } | |
4858 | /* C++ */ | |
4859 | else if (comptypes (type2, type1, 0)) | |
4860 | result_type = type2; | |
4861 | else if (IS_AGGR_TYPE (TREE_TYPE (type1)) | |
4862 | && IS_AGGR_TYPE (TREE_TYPE (type2)) | |
4863 | && (result_type = common_base_type (TREE_TYPE (type1), TREE_TYPE (type2)))) | |
4864 | { | |
4865 | if (result_type == error_mark_node) | |
4866 | { | |
00595019 MS |
4867 | cp_error ("common base type of types `%T' and `%T' is ambiguous", |
4868 | TREE_TYPE (type1), TREE_TYPE (type2)); | |
8d08fdba MS |
4869 | result_type = ptr_type_node; |
4870 | } | |
00595019 MS |
4871 | else |
4872 | { | |
4873 | if (pedantic | |
4874 | && result_type != TREE_TYPE (type1) | |
4875 | && result_type != TREE_TYPE (type2)) | |
4876 | cp_pedwarn ("`%T' and `%T' converted to `%T *' in conditional expression", | |
4877 | type1, type2, result_type); | |
4878 | ||
f30432d7 | 4879 | result_type = build_pointer_type (result_type); |
00595019 | 4880 | } |
8d08fdba MS |
4881 | } |
4882 | else | |
4883 | { | |
4884 | pedwarn ("pointer type mismatch in conditional expression"); | |
4885 | result_type = ptr_type_node; | |
4886 | } | |
4887 | } | |
4888 | else if (code1 == POINTER_TYPE && code2 == INTEGER_TYPE) | |
4889 | { | |
d11ad92e | 4890 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba MS |
4891 | result_type = type1; |
4892 | } | |
4893 | else if (code2 == POINTER_TYPE && code1 == INTEGER_TYPE) | |
4894 | { | |
d11ad92e | 4895 | pedwarn ("pointer/integer type mismatch in conditional expression"); |
8d08fdba | 4896 | result_type = type2; |
8d08fdba MS |
4897 | } |
4898 | ||
4899 | if (!result_type) | |
4900 | { | |
4901 | /* The match does not look good. If either is | |
4902 | an aggregate value, try converting to a scalar type. */ | |
4903 | if (code1 == RECORD_TYPE && code2 == RECORD_TYPE) | |
4904 | { | |
71851aaa | 4905 | cp_error ("aggregate mismatch in conditional expression: `%T' vs `%T'", type1, type2); |
8d08fdba MS |
4906 | return error_mark_node; |
4907 | } | |
fc378698 MS |
4908 | /* Warning: this code assumes that conversion between cv-variants of |
4909 | a type is done using NOP_EXPRs. */ | |
8d08fdba MS |
4910 | if (code1 == RECORD_TYPE && TYPE_HAS_CONVERSION (type1)) |
4911 | { | |
e92cc029 MS |
4912 | /* There are other types besides pointers and records. */ |
4913 | tree tmp; | |
4914 | if (code2 == POINTER_TYPE) | |
4915 | tmp = build_pointer_type | |
4916 | (build_type_variant (TREE_TYPE (type2), 1, 1)); | |
4917 | else | |
4918 | tmp = type2; | |
fc378698 | 4919 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op1, 0); |
8d08fdba MS |
4920 | if (tmp == NULL_TREE) |
4921 | { | |
fc378698 MS |
4922 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
4923 | type1, type2); | |
8d08fdba MS |
4924 | return error_mark_node; |
4925 | } | |
4926 | if (tmp == error_mark_node) | |
4927 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
4928 | else |
4929 | STRIP_NOPS (tmp); | |
e92cc029 | 4930 | result_type = common_type (type2, TREE_TYPE (tmp)); |
8d08fdba MS |
4931 | op1 = tmp; |
4932 | } | |
4933 | else if (code2 == RECORD_TYPE && TYPE_HAS_CONVERSION (type2)) | |
4934 | { | |
e92cc029 MS |
4935 | tree tmp; |
4936 | if (code1 == POINTER_TYPE) | |
4937 | tmp = build_pointer_type | |
4938 | (build_type_variant (TREE_TYPE (type1), 1, 1)); | |
4939 | else | |
4940 | tmp = type1; | |
4941 | ||
fc378698 | 4942 | tmp = build_type_conversion (CONVERT_EXPR, tmp, op2, 0); |
8d08fdba MS |
4943 | if (tmp == NULL_TREE) |
4944 | { | |
fc378698 MS |
4945 | cp_error ("incompatible types `%T' and `%T' in `?:'", |
4946 | type1, type2); | |
8d08fdba MS |
4947 | return error_mark_node; |
4948 | } | |
4949 | if (tmp == error_mark_node) | |
4950 | error ("ambiguous pointer conversion"); | |
fc378698 MS |
4951 | else |
4952 | STRIP_NOPS (tmp); | |
4953 | result_type = common_type (type1, TREE_TYPE (tmp)); | |
8d08fdba MS |
4954 | op2 = tmp; |
4955 | } | |
4956 | else if (flag_cond_mismatch) | |
4957 | result_type = void_type_node; | |
4958 | else | |
4959 | { | |
4960 | error ("type mismatch in conditional expression"); | |
4961 | return error_mark_node; | |
4962 | } | |
4963 | } | |
4964 | ||
79ff2c6c MS |
4965 | if (TREE_CODE (result_type) == POINTER_TYPE |
4966 | && TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
4967 | result_type = build_ptrmemfunc_type (result_type); | |
4968 | ||
8d08fdba MS |
4969 | if (result_type != TREE_TYPE (op1)) |
4970 | op1 = convert_and_check (result_type, op1); | |
4971 | if (result_type != TREE_TYPE (op2)) | |
4972 | op2 = convert_and_check (result_type, op2); | |
4973 | ||
8d08fdba MS |
4974 | if (TREE_CONSTANT (ifexp)) |
4975 | return integer_zerop (ifexp) ? op2 : op1; | |
4976 | ||
a5894242 MS |
4977 | return convert_from_reference |
4978 | (fold (build (COND_EXPR, result_type, ifexp, op1, op2))); | |
8d08fdba MS |
4979 | } |
4980 | \f | |
4981 | /* Handle overloading of the ',' operator when needed. Otherwise, | |
4982 | this function just builds an expression list. */ | |
e92cc029 | 4983 | |
8d08fdba MS |
4984 | tree |
4985 | build_x_compound_expr (list) | |
4986 | tree list; | |
4987 | { | |
4988 | tree rest = TREE_CHAIN (list); | |
4989 | tree result; | |
4990 | ||
5566b478 MS |
4991 | if (current_template_parms) |
4992 | return build_min_nt (COMPOUND_EXPR, list, NULL_TREE); | |
4993 | ||
8d08fdba MS |
4994 | if (rest == NULL_TREE) |
4995 | return build_compound_expr (list); | |
4996 | ||
4997 | result = build_opfncall (COMPOUND_EXPR, LOOKUP_NORMAL, | |
4998 | TREE_VALUE (list), TREE_VALUE (rest), NULL_TREE); | |
4999 | if (result) | |
5000 | return build_x_compound_expr (tree_cons (NULL_TREE, result, TREE_CHAIN (rest))); | |
b19b4a78 MS |
5001 | |
5002 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list))) | |
5003 | { | |
5004 | /* the left-hand operand of a comma expression is like an expression | |
5005 | statement: we should warn if it doesn't have any side-effects, | |
5006 | unless it was explicitly cast to (void). */ | |
5007 | if ((extra_warnings || warn_unused) | |
5008 | && !(TREE_CODE (TREE_VALUE(list)) == CONVERT_EXPR | |
5009 | && TREE_TYPE (TREE_VALUE(list)) == void_type_node)) | |
5010 | warning("left-hand operand of comma expression has no effect"); | |
5011 | } | |
5012 | #if 0 /* this requires a gcc backend patch to export warn_if_unused_value */ | |
5013 | else if (warn_unused) | |
5014 | warn_if_unused_value (TREE_VALUE(list)); | |
5015 | #endif | |
5016 | ||
8d08fdba MS |
5017 | return build_compound_expr (tree_cons (NULL_TREE, TREE_VALUE (list), |
5018 | build_tree_list (NULL_TREE, build_x_compound_expr (rest)))); | |
5019 | } | |
5020 | ||
5021 | /* Given a list of expressions, return a compound expression | |
5022 | that performs them all and returns the value of the last of them. */ | |
5023 | ||
5024 | tree | |
5025 | build_compound_expr (list) | |
5026 | tree list; | |
5027 | { | |
5028 | register tree rest; | |
5029 | ||
5030 | if (TREE_READONLY_DECL_P (TREE_VALUE (list))) | |
5031 | TREE_VALUE (list) = decl_constant_value (TREE_VALUE (list)); | |
5032 | ||
5033 | if (TREE_CHAIN (list) == 0) | |
5034 | { | |
5035 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5036 | Strip such NOP_EXPRs, since LIST is used in non-lvalue context. */ | |
5037 | if (TREE_CODE (list) == NOP_EXPR | |
5038 | && TREE_TYPE (list) == TREE_TYPE (TREE_OPERAND (list, 0))) | |
5039 | list = TREE_OPERAND (list, 0); | |
5040 | ||
5041 | /* Convert arrays to pointers. */ | |
5042 | if (TREE_CODE (TREE_TYPE (TREE_VALUE (list))) == ARRAY_TYPE) | |
5043 | return default_conversion (TREE_VALUE (list)); | |
5044 | else | |
5045 | return TREE_VALUE (list); | |
5046 | } | |
5047 | ||
5048 | rest = build_compound_expr (TREE_CHAIN (list)); | |
5049 | ||
b19b4a78 MS |
5050 | /* When pedantic, a compound expression cannot be a constant expression. */ |
5051 | if (! TREE_SIDE_EFFECTS (TREE_VALUE (list)) && ! pedantic) | |
5052 | return rest; | |
8d08fdba MS |
5053 | |
5054 | return build (COMPOUND_EXPR, TREE_TYPE (rest), | |
5055 | break_out_cleanups (TREE_VALUE (list)), rest); | |
5056 | } | |
5057 | ||
cdf5b885 MS |
5058 | tree |
5059 | build_static_cast (type, expr) | |
a4443a08 MS |
5060 | tree type, expr; |
5061 | { | |
c11b6f21 MS |
5062 | tree intype, binfo; |
5063 | int ok; | |
5064 | ||
5065 | if (type == error_mark_node || expr == error_mark_node) | |
5066 | return error_mark_node; | |
5067 | ||
5068 | if (TREE_CODE (expr) == OFFSET_REF) | |
5069 | expr = resolve_offset_ref (expr); | |
5070 | ||
e92cc029 MS |
5071 | if (current_template_parms) |
5072 | { | |
5073 | tree t = build_min (STATIC_CAST_EXPR, type, expr); | |
5074 | return t; | |
5075 | } | |
5076 | ||
c11b6f21 MS |
5077 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. |
5078 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5079 | if (TREE_CODE (type) != REFERENCE_TYPE | |
5080 | && TREE_CODE (expr) == NOP_EXPR | |
5081 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5082 | expr = TREE_OPERAND (expr, 0); | |
5083 | ||
5084 | if (TREE_CODE (type) == VOID_TYPE) | |
5085 | return build1 (CONVERT_EXPR, type, expr); | |
5086 | ||
5087 | if (type_unknown_p (expr)) | |
5088 | { | |
5089 | expr = instantiate_type (type, expr, 1); | |
5090 | if (expr == error_mark_node) | |
5091 | return error_mark_node; | |
5092 | } | |
5093 | ||
5094 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
5095 | return (convert_from_reference | |
5096 | (convert_to_reference (type, expr, CONV_STATIC|CONV_IMPLICIT, | |
5097 | LOOKUP_COMPLAIN, NULL_TREE))); | |
5098 | ||
5099 | if (IS_AGGR_TYPE (type)) | |
5100 | return build_cplus_new | |
5101 | (type, (build_method_call | |
5102 | (NULL_TREE, ctor_identifier, build_tree_list (NULL_TREE, expr), | |
5103 | TYPE_BINFO (type), LOOKUP_NORMAL))); | |
5104 | ||
5105 | expr = decay_conversion (expr); | |
5106 | intype = TREE_TYPE (expr); | |
5107 | ||
5108 | /* FIXME handle casting to array type. */ | |
5109 | ||
5110 | ok = 0; | |
5111 | if (can_convert_arg (type, intype, expr)) | |
5112 | ok = 1; | |
5113 | else if (TYPE_PTROB_P (type) && TYPE_PTROB_P (intype)) | |
5114 | { | |
5115 | tree binfo; | |
5116 | if (IS_AGGR_TYPE (TREE_TYPE (type)) && IS_AGGR_TYPE (TREE_TYPE (intype)) | |
5117 | && (TYPE_READONLY (TREE_TYPE (type)) | |
5118 | >= TYPE_READONLY (TREE_TYPE (intype))) | |
5119 | && (TYPE_VOLATILE (TREE_TYPE (type)) | |
5120 | >= TYPE_VOLATILE (TREE_TYPE (intype))) | |
5121 | && (binfo = get_binfo (TREE_TYPE (intype), TREE_TYPE (type), 0)) | |
5122 | && ! TREE_VIA_VIRTUAL (binfo)) | |
5123 | ok = 1; | |
5124 | } | |
5125 | else if (TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype)) | |
5126 | { | |
5127 | if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))), | |
5128 | TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (intype))), 1) | |
5129 | && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (type))) | |
5130 | >= TYPE_READONLY (TREE_TYPE (TREE_TYPE (intype)))) | |
5131 | && (TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (type))) | |
5132 | >= TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (intype)))) | |
5133 | && (binfo = get_binfo (TYPE_OFFSET_BASETYPE (intype), | |
5134 | TYPE_OFFSET_BASETYPE (type), 0)) | |
5135 | && ! TREE_VIA_VIRTUAL (binfo)) | |
5136 | ok = 1; | |
5137 | } | |
5138 | else if (TREE_CODE (intype) != BOOLEAN_TYPE | |
5139 | && TREE_CODE (type) != ARRAY_TYPE | |
5140 | && TREE_CODE (type) != FUNCTION_TYPE | |
5141 | && can_convert (intype, type)) | |
5142 | ok = 1; | |
5143 | ||
5144 | if (ok) | |
5145 | return build_c_cast (type, expr, 0); | |
5146 | ||
5147 | cp_error ("static_cast from `%T' to `%T'", intype, type); | |
5148 | return error_mark_node; | |
a4443a08 MS |
5149 | } |
5150 | ||
cdf5b885 MS |
5151 | tree |
5152 | build_reinterpret_cast (type, expr) | |
a4443a08 MS |
5153 | tree type, expr; |
5154 | { | |
c11b6f21 MS |
5155 | tree intype; |
5156 | ||
5157 | if (type == error_mark_node || expr == error_mark_node) | |
5158 | return error_mark_node; | |
5159 | ||
5160 | if (TREE_CODE (expr) == OFFSET_REF) | |
5161 | expr = resolve_offset_ref (expr); | |
8ccc31eb | 5162 | |
5566b478 MS |
5163 | if (current_template_parms) |
5164 | { | |
5165 | tree t = build_min (REINTERPRET_CAST_EXPR, type, expr); | |
5166 | return t; | |
5167 | } | |
5168 | ||
c11b6f21 MS |
5169 | if (TREE_CODE (type) != REFERENCE_TYPE) |
5170 | { | |
5171 | expr = decay_conversion (expr); | |
5172 | ||
5173 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5174 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5175 | if (TREE_CODE (expr) == NOP_EXPR | |
5176 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5177 | expr = TREE_OPERAND (expr, 0); | |
5178 | } | |
5179 | ||
5180 | if (type_unknown_p (expr)) | |
5181 | { | |
5182 | expr = instantiate_type (type, expr, 1); | |
5183 | if (expr == error_mark_node) | |
5184 | return error_mark_node; | |
5185 | } | |
a80e4195 | 5186 | |
c11b6f21 | 5187 | intype = TREE_TYPE (expr); |
a80e4195 | 5188 | |
c11b6f21 MS |
5189 | if (TREE_CODE (type) == REFERENCE_TYPE) |
5190 | { | |
5191 | if (! real_lvalue_p (expr)) | |
5192 | { | |
5193 | cp_error ("reinterpret_cast from `%T' rvalue to `%T'", intype, type); | |
5194 | return error_mark_node; | |
5195 | } | |
5196 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
5197 | if (expr != error_mark_node) | |
5198 | expr = build_reinterpret_cast | |
5199 | (build_pointer_type (TREE_TYPE (type)), expr); | |
5200 | if (expr != error_mark_node) | |
5201 | expr = build_indirect_ref (expr, 0); | |
5202 | return expr; | |
5203 | } | |
5204 | else if (comptypes (TYPE_MAIN_VARIANT (intype), TYPE_MAIN_VARIANT (type), 1)) | |
5205 | return build_static_cast (type, expr); | |
8ccc31eb | 5206 | |
c11b6f21 MS |
5207 | if (TYPE_PTR_P (type) && (TREE_CODE (intype) == INTEGER_TYPE |
5208 | || TREE_CODE (intype) == ENUMERAL_TYPE)) | |
5209 | /* OK */; | |
5210 | else if (TREE_CODE (type) == INTEGER_TYPE && TYPE_PTR_P (intype)) | |
8ccc31eb | 5211 | { |
c11b6f21 MS |
5212 | if (TYPE_PRECISION (type) < TYPE_PRECISION (intype)) |
5213 | cp_pedwarn ("reinterpret_cast from `%T' to `%T' loses precision", | |
5214 | intype, type); | |
8ccc31eb | 5215 | } |
c11b6f21 MS |
5216 | else if ((TYPE_PTRFN_P (type) && TYPE_PTRFN_P (intype)) |
5217 | || (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))) | |
8ccc31eb | 5218 | { |
c11b6f21 MS |
5219 | if (TREE_READONLY_DECL_P (expr)) |
5220 | expr = decl_constant_value (expr); | |
5221 | return fold (build1 (NOP_EXPR, type, expr)); | |
8ccc31eb | 5222 | } |
c11b6f21 MS |
5223 | else if ((TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype)) |
5224 | || (TYPE_PTROBV_P (type) && TYPE_PTROBV_P (intype))) | |
8ccc31eb | 5225 | { |
c11b6f21 MS |
5226 | if (! comp_ptr_ttypes_reinterpret (TREE_TYPE (type), TREE_TYPE (intype))) |
5227 | cp_pedwarn ("reinterpret_cast from `%T' to `%T' casts away const (or volatile)", | |
5228 | intype, type); | |
5229 | ||
5230 | if (TREE_READONLY_DECL_P (expr)) | |
5231 | expr = decl_constant_value (expr); | |
5232 | return fold (build1 (NOP_EXPR, type, expr)); | |
8ccc31eb | 5233 | } |
c11b6f21 | 5234 | else |
8ccc31eb | 5235 | { |
c11b6f21 | 5236 | cp_error ("reinterpret_cast from `%T' to `%T'", intype, type); |
8ccc31eb MS |
5237 | return error_mark_node; |
5238 | } | |
c11b6f21 MS |
5239 | |
5240 | return convert (type, expr); | |
a4443a08 MS |
5241 | } |
5242 | ||
cdf5b885 MS |
5243 | tree |
5244 | build_const_cast (type, expr) | |
a4443a08 MS |
5245 | tree type, expr; |
5246 | { | |
c11b6f21 | 5247 | tree intype; |
8ccc31eb | 5248 | |
f30432d7 MS |
5249 | if (type == error_mark_node || expr == error_mark_node) |
5250 | return error_mark_node; | |
5251 | ||
c11b6f21 MS |
5252 | if (TREE_CODE (expr) == OFFSET_REF) |
5253 | expr = resolve_offset_ref (expr); | |
5254 | ||
e92cc029 MS |
5255 | if (current_template_parms) |
5256 | { | |
5257 | tree t = build_min (CONST_CAST_EXPR, type, expr); | |
5258 | return t; | |
5259 | } | |
5260 | ||
c11b6f21 | 5261 | if (TREE_CODE (type) != REFERENCE_TYPE) |
8ccc31eb | 5262 | { |
c11b6f21 MS |
5263 | expr = decay_conversion (expr); |
5264 | ||
5265 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
5266 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ | |
5267 | if (TREE_CODE (expr) == NOP_EXPR | |
5268 | && TREE_TYPE (expr) == TREE_TYPE (TREE_OPERAND (expr, 0))) | |
5269 | expr = TREE_OPERAND (expr, 0); | |
8ccc31eb MS |
5270 | } |
5271 | ||
c11b6f21 | 5272 | if (type_unknown_p (expr)) |
8ccc31eb | 5273 | { |
c11b6f21 MS |
5274 | expr = instantiate_type (type, expr, 1); |
5275 | if (expr == error_mark_node) | |
5276 | return error_mark_node; | |
8ccc31eb | 5277 | } |
8ccc31eb | 5278 | |
c11b6f21 | 5279 | intype = TREE_TYPE (expr); |
8ccc31eb | 5280 | |
c11b6f21 MS |
5281 | if (comptypes (TYPE_MAIN_VARIANT (intype), TYPE_MAIN_VARIANT (type), 1)) |
5282 | return build_static_cast (type, expr); | |
5283 | else if (TREE_CODE (type) == REFERENCE_TYPE) | |
8ccc31eb | 5284 | { |
c11b6f21 | 5285 | if (! real_lvalue_p (expr)) |
8ccc31eb | 5286 | { |
c11b6f21 | 5287 | cp_error ("const_cast from `%T' rvalue to `%T'", intype, type); |
8ccc31eb MS |
5288 | return error_mark_node; |
5289 | } | |
8ccc31eb | 5290 | |
c11b6f21 MS |
5291 | if (comp_ptr_ttypes_const (TREE_TYPE (type), intype)) |
5292 | return (convert_from_reference | |
5293 | (convert_to_reference (type, expr, CONV_CONST|CONV_IMPLICIT, | |
5294 | LOOKUP_COMPLAIN, NULL_TREE))); | |
8ccc31eb | 5295 | } |
c11b6f21 MS |
5296 | else if (TREE_CODE (type) == POINTER_TYPE |
5297 | && TREE_CODE (intype) == POINTER_TYPE | |
5298 | && comp_ptr_ttypes_const (TREE_TYPE (type), TREE_TYPE (intype))) | |
5299 | return convert (type, expr); | |
8ccc31eb | 5300 | |
c11b6f21 MS |
5301 | cp_error ("const_cast from `%T' to `%T'", intype, type); |
5302 | return error_mark_node; | |
a4443a08 MS |
5303 | } |
5304 | ||
6060a796 MS |
5305 | /* Build an expression representing a cast to type TYPE of expression EXPR. |
5306 | ||
5307 | ALLOW_NONCONVERTING is true if we should allow non-converting constructors | |
5308 | when doing the cast. */ | |
8d08fdba MS |
5309 | |
5310 | tree | |
6060a796 | 5311 | build_c_cast (type, expr, allow_nonconverting) |
8d08fdba MS |
5312 | register tree type; |
5313 | tree expr; | |
6060a796 | 5314 | int allow_nonconverting; |
8d08fdba MS |
5315 | { |
5316 | register tree value = expr; | |
5317 | ||
5318 | if (type == error_mark_node || expr == error_mark_node) | |
5319 | return error_mark_node; | |
5320 | ||
5321 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
8ccc31eb MS |
5322 | Strip such NOP_EXPRs if VALUE is being used in non-lvalue context. */ |
5323 | if (TREE_CODE (type) != REFERENCE_TYPE | |
5324 | && TREE_CODE (value) == NOP_EXPR | |
8d08fdba MS |
5325 | && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0))) |
5326 | value = TREE_OPERAND (value, 0); | |
5327 | ||
5328 | if (TREE_TYPE (expr) | |
5329 | && TREE_CODE (TREE_TYPE (expr)) == OFFSET_TYPE | |
5330 | && TREE_CODE (type) != OFFSET_TYPE) | |
5331 | value = resolve_offset_ref (value); | |
5332 | ||
5333 | if (TREE_CODE (type) == ARRAY_TYPE) | |
5334 | { | |
5335 | /* Allow casting from T1* to T2[] because Cfront allows it. | |
5336 | NIHCL uses it. It is not valid ANSI C however, and hence, not | |
5337 | valid ANSI C++. */ | |
5338 | if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE) | |
5339 | { | |
5340 | if (pedantic) | |
5341 | pedwarn ("ANSI C++ forbids casting to an array type"); | |
5342 | type = build_pointer_type (TREE_TYPE (type)); | |
5343 | } | |
5344 | else | |
5345 | { | |
5346 | error ("ANSI C++ forbids casting to an array type"); | |
5347 | return error_mark_node; | |
5348 | } | |
5349 | } | |
5350 | ||
a0a33927 MS |
5351 | if (TREE_CODE (type) == FUNCTION_TYPE |
5352 | || TREE_CODE (type) == METHOD_TYPE) | |
5353 | { | |
5354 | cp_error ("casting to function type `%T'", type); | |
5355 | return error_mark_node; | |
5356 | } | |
5357 | ||
8d08fdba MS |
5358 | if (IS_SIGNATURE (type)) |
5359 | { | |
5360 | error ("cast specifies signature type"); | |
5361 | return error_mark_node; | |
5362 | } | |
5363 | ||
5566b478 MS |
5364 | if (current_template_parms) |
5365 | { | |
5366 | tree t = build_min (CAST_EXPR, type, | |
5367 | min_tree_cons (NULL_TREE, value, NULL_TREE)); | |
5368 | return t; | |
5369 | } | |
5370 | ||
39211cd5 | 5371 | if (TREE_CODE (type) == VOID_TYPE) |
a292b002 | 5372 | value = build1 (CONVERT_EXPR, type, value); |
39211cd5 | 5373 | else if (TREE_TYPE (value) == NULL_TREE |
8d08fdba MS |
5374 | || type_unknown_p (value)) |
5375 | { | |
5376 | value = instantiate_type (type, value, 1); | |
5377 | /* Did we lose? */ | |
5378 | if (value == error_mark_node) | |
5379 | return error_mark_node; | |
5380 | } | |
5381 | else | |
5382 | { | |
8ccc31eb MS |
5383 | tree otype; |
5384 | int flag; | |
8d08fdba MS |
5385 | |
5386 | /* Convert functions and arrays to pointers and | |
5387 | convert references to their expanded types, | |
5388 | but don't convert any other types. */ | |
5389 | if (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE | |
5390 | || TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE | |
5391 | || TREE_CODE (TREE_TYPE (value)) == ARRAY_TYPE | |
5392 | || TREE_CODE (TREE_TYPE (value)) == REFERENCE_TYPE) | |
5393 | value = default_conversion (value); | |
5394 | otype = TREE_TYPE (value); | |
5395 | ||
5396 | /* Optionally warn about potentially worrisome casts. */ | |
5397 | ||
5398 | if (warn_cast_qual | |
5399 | && TREE_CODE (type) == POINTER_TYPE | |
5400 | && TREE_CODE (otype) == POINTER_TYPE) | |
5401 | { | |
5402 | /* For C++ we make these regular warnings, rather than | |
5403 | softening them into pedwarns. */ | |
5404 | if (TYPE_VOLATILE (TREE_TYPE (otype)) | |
5405 | && ! TYPE_VOLATILE (TREE_TYPE (type))) | |
5406 | warning ("cast discards `volatile' from pointer target type"); | |
5407 | if (TYPE_READONLY (TREE_TYPE (otype)) | |
5408 | && ! TYPE_READONLY (TREE_TYPE (type))) | |
5409 | warning ("cast discards `const' from pointer target type"); | |
5410 | } | |
5411 | ||
5412 | /* Warn about possible alignment problems. */ | |
5413 | if (STRICT_ALIGNMENT && warn_cast_align | |
5414 | && TREE_CODE (type) == POINTER_TYPE | |
5415 | && TREE_CODE (otype) == POINTER_TYPE | |
5416 | && TREE_CODE (TREE_TYPE (otype)) != VOID_TYPE | |
5417 | && TREE_CODE (TREE_TYPE (otype)) != FUNCTION_TYPE | |
5418 | && TYPE_ALIGN (TREE_TYPE (type)) > TYPE_ALIGN (TREE_TYPE (otype))) | |
5419 | warning ("cast increases required alignment of target type"); | |
5420 | ||
5421 | #if 0 | |
9e9ff709 MS |
5422 | /* We should see about re-enabling these, they seem useful to |
5423 | me. */ | |
8d08fdba MS |
5424 | if (TREE_CODE (type) == INTEGER_TYPE |
5425 | && TREE_CODE (otype) == POINTER_TYPE | |
5426 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype)) | |
5427 | warning ("cast from pointer to integer of different size"); | |
5428 | ||
5429 | if (TREE_CODE (type) == POINTER_TYPE | |
5430 | && TREE_CODE (otype) == INTEGER_TYPE | |
5431 | && TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
5432 | /* Don't warn about converting 0 to pointer, | |
5433 | provided the 0 was explicit--not cast or made by folding. */ | |
5434 | && !(TREE_CODE (value) == INTEGER_CST && integer_zerop (value))) | |
5435 | warning ("cast to pointer from integer of different size"); | |
5436 | #endif | |
5437 | ||
8ccc31eb | 5438 | flag = allow_nonconverting ? CONV_NONCONVERTING : 0; |
f376e137 | 5439 | |
8ccc31eb MS |
5440 | if (TREE_CODE (type) == REFERENCE_TYPE) |
5441 | value = (convert_from_reference | |
5442 | (convert_to_reference (type, value, CONV_OLD_CONVERT|flag, | |
5443 | LOOKUP_COMPLAIN, NULL_TREE))); | |
5444 | else | |
8d08fdba | 5445 | { |
8ccc31eb MS |
5446 | tree ovalue; |
5447 | ||
5448 | if (TREE_READONLY_DECL_P (value)) | |
5449 | value = decl_constant_value (value); | |
5450 | ||
5451 | ovalue = value; | |
5452 | value = convert_force (type, value, flag); | |
5453 | ||
5454 | /* Ignore any integer overflow caused by the cast. */ | |
5455 | if (TREE_CODE (value) == INTEGER_CST) | |
5456 | { | |
5457 | TREE_OVERFLOW (value) = TREE_OVERFLOW (ovalue); | |
5458 | TREE_CONSTANT_OVERFLOW (value) = TREE_CONSTANT_OVERFLOW (ovalue); | |
5459 | } | |
8d08fdba MS |
5460 | } |
5461 | } | |
5462 | ||
5463 | /* Always produce some operator for an explicit cast, | |
c11b6f21 MS |
5464 | so we can tell (for -pedantic) that the cast is no lvalue. */ |
5465 | if (TREE_CODE (type) != REFERENCE_TYPE && value == expr | |
5466 | && real_lvalue_p (value)) | |
8ccc31eb | 5467 | value = non_lvalue (value); |
8d08fdba MS |
5468 | |
5469 | return value; | |
5470 | } | |
5471 | \f | |
e8abc66f MS |
5472 | tree |
5473 | expand_target_expr (t) | |
5474 | tree t; | |
5475 | { | |
72b7eeff MS |
5476 | extern int temp_slot_level; |
5477 | extern int target_temp_slot_level; | |
5478 | int old_temp_level = target_temp_slot_level; | |
5479 | ||
e8abc66f MS |
5480 | tree xval = make_node (RTL_EXPR); |
5481 | rtx rtxval; | |
5482 | ||
72b7eeff MS |
5483 | /* Any TARGET_EXPR temps live only as long as the outer temp level. |
5484 | Since they are preserved in this new inner level, we know they | |
5485 | will make it into the outer level. */ | |
5486 | push_temp_slots (); | |
5487 | target_temp_slot_level = temp_slot_level; | |
5488 | ||
e8abc66f MS |
5489 | do_pending_stack_adjust (); |
5490 | start_sequence_for_rtl_expr (xval); | |
5491 | emit_note (0, -1); | |
a0128b67 | 5492 | rtxval = expand_expr (t, NULL_RTX, VOIDmode, 0); |
e8abc66f MS |
5493 | do_pending_stack_adjust (); |
5494 | TREE_SIDE_EFFECTS (xval) = 1; | |
5495 | RTL_EXPR_SEQUENCE (xval) = get_insns (); | |
5496 | end_sequence (); | |
5497 | RTL_EXPR_RTL (xval) = rtxval; | |
5498 | TREE_TYPE (xval) = TREE_TYPE (t); | |
72b7eeff MS |
5499 | |
5500 | pop_temp_slots (); | |
5501 | target_temp_slot_level = old_temp_level; | |
5502 | ||
e8abc66f MS |
5503 | return xval; |
5504 | } | |
5505 | ||
8d08fdba MS |
5506 | /* Build an assignment expression of lvalue LHS from value RHS. |
5507 | MODIFYCODE is the code for a binary operator that we use | |
5508 | to combine the old value of LHS with RHS to get the new value. | |
5509 | Or else MODIFYCODE is NOP_EXPR meaning do a simple assignment. | |
5510 | ||
e92cc029 MS |
5511 | C++: If MODIFYCODE is INIT_EXPR, then leave references unbashed. */ |
5512 | ||
8d08fdba MS |
5513 | tree |
5514 | build_modify_expr (lhs, modifycode, rhs) | |
5515 | tree lhs; | |
5516 | enum tree_code modifycode; | |
5517 | tree rhs; | |
5518 | { | |
5519 | register tree result; | |
5520 | tree newrhs = rhs; | |
5521 | tree lhstype = TREE_TYPE (lhs); | |
5522 | tree olhstype = lhstype; | |
a3203465 | 5523 | tree olhs = lhs; |
8d08fdba | 5524 | |
8d08fdba MS |
5525 | /* Avoid duplicate error messages from operands that had errors. */ |
5526 | if (TREE_CODE (lhs) == ERROR_MARK || TREE_CODE (rhs) == ERROR_MARK) | |
5527 | return error_mark_node; | |
5528 | ||
f376e137 MS |
5529 | /* Types that aren't fully specified cannot be used in assignments. */ |
5530 | lhs = require_complete_type (lhs); | |
5531 | ||
8d08fdba MS |
5532 | newrhs = rhs; |
5533 | ||
5534 | /* Handle assignment to signature pointers/refs. */ | |
5535 | ||
5536 | if (TYPE_LANG_SPECIFIC (lhstype) && | |
5537 | (IS_SIGNATURE_POINTER (lhstype) || IS_SIGNATURE_REFERENCE (lhstype))) | |
5538 | { | |
5539 | return build_signature_pointer_constructor (lhs, rhs); | |
5540 | } | |
5541 | ||
5542 | /* Handle control structure constructs used as "lvalues". */ | |
5543 | ||
5544 | switch (TREE_CODE (lhs)) | |
5545 | { | |
5546 | /* Handle --foo = 5; as these are valid constructs in C++ */ | |
5547 | case PREDECREMENT_EXPR: | |
5548 | case PREINCREMENT_EXPR: | |
5549 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (lhs, 0))) | |
5550 | lhs = build (TREE_CODE (lhs), TREE_TYPE (lhs), | |
46b02c6d MS |
5551 | stabilize_reference (TREE_OPERAND (lhs, 0)), |
5552 | TREE_OPERAND (lhs, 1)); | |
8d08fdba MS |
5553 | return build (COMPOUND_EXPR, lhstype, |
5554 | lhs, | |
5555 | build_modify_expr (TREE_OPERAND (lhs, 0), | |
5556 | modifycode, rhs)); | |
5557 | ||
5558 | /* Handle (a, b) used as an "lvalue". */ | |
5559 | case COMPOUND_EXPR: | |
8d08fdba MS |
5560 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 1), |
5561 | modifycode, rhs); | |
5562 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5563 | return error_mark_node; | |
5564 | return build (COMPOUND_EXPR, lhstype, | |
5565 | TREE_OPERAND (lhs, 0), newrhs); | |
5566 | ||
a4443a08 MS |
5567 | case MODIFY_EXPR: |
5568 | newrhs = build_modify_expr (TREE_OPERAND (lhs, 0), modifycode, rhs); | |
5569 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5570 | return error_mark_node; | |
5571 | return build (COMPOUND_EXPR, lhstype, lhs, newrhs); | |
5572 | ||
8d08fdba MS |
5573 | /* Handle (a ? b : c) used as an "lvalue". */ |
5574 | case COND_EXPR: | |
8d08fdba MS |
5575 | rhs = save_expr (rhs); |
5576 | { | |
5577 | /* Produce (a ? (b = rhs) : (c = rhs)) | |
5578 | except that the RHS goes through a save-expr | |
5579 | so the code to compute it is only emitted once. */ | |
5580 | tree cond | |
5581 | = build_conditional_expr (TREE_OPERAND (lhs, 0), | |
eac293a1 | 5582 | build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 1)), |
8d08fdba | 5583 | modifycode, rhs), |
eac293a1 | 5584 | build_modify_expr (convert (TREE_TYPE (lhs), TREE_OPERAND (lhs, 2)), |
8d08fdba MS |
5585 | modifycode, rhs)); |
5586 | if (TREE_CODE (cond) == ERROR_MARK) | |
5587 | return cond; | |
5588 | /* Make sure the code to compute the rhs comes out | |
5589 | before the split. */ | |
5590 | return build (COMPOUND_EXPR, TREE_TYPE (lhs), | |
5591 | /* Case to void to suppress warning | |
5592 | from warn_if_unused_value. */ | |
5593 | convert (void_type_node, rhs), cond); | |
5594 | } | |
5595 | } | |
5596 | ||
a0a33927 MS |
5597 | if (TREE_CODE (lhs) == OFFSET_REF) |
5598 | { | |
5599 | if (TREE_OPERAND (lhs, 0) == NULL_TREE) | |
5600 | { | |
5601 | /* Static class member? */ | |
5602 | tree member = TREE_OPERAND (lhs, 1); | |
5603 | if (TREE_CODE (member) == VAR_DECL) | |
5604 | lhs = member; | |
5605 | else | |
5606 | { | |
5607 | compiler_error ("invalid static class member"); | |
5608 | return error_mark_node; | |
5609 | } | |
5610 | } | |
5611 | else | |
5612 | lhs = resolve_offset_ref (lhs); | |
5613 | ||
5614 | olhstype = lhstype = TREE_TYPE (lhs); | |
5615 | } | |
5616 | ||
5617 | if (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5618 | && modifycode != INIT_EXPR) | |
5619 | { | |
5620 | lhs = convert_from_reference (lhs); | |
5621 | olhstype = lhstype = TREE_TYPE (lhs); | |
5622 | } | |
5623 | ||
8d08fdba MS |
5624 | /* If a binary op has been requested, combine the old LHS value with the RHS |
5625 | producing the value we should actually store into the LHS. */ | |
5626 | ||
5627 | if (modifycode == INIT_EXPR) | |
5628 | { | |
db5ae43f MS |
5629 | if (! IS_AGGR_TYPE (lhstype)) |
5630 | /* Do the default thing */; | |
5631 | else if (! TYPE_HAS_CONSTRUCTOR (lhstype)) | |
1743ca29 RK |
5632 | { |
5633 | cp_error ("`%T' has no constructors", lhstype); | |
5634 | return error_mark_node; | |
5635 | } | |
e8abc66f | 5636 | else if (TYPE_HAS_TRIVIAL_INIT_REF (lhstype) |
db5ae43f MS |
5637 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
5638 | /* Do the default thing */; | |
5639 | else | |
8d08fdba | 5640 | { |
fc378698 | 5641 | result = build_method_call (lhs, ctor_identifier, |
8d08fdba | 5642 | build_tree_list (NULL_TREE, rhs), |
fc378698 | 5643 | TYPE_BINFO (lhstype), LOOKUP_NORMAL); |
8d08fdba MS |
5644 | if (result == NULL_TREE) |
5645 | return error_mark_node; | |
5646 | return result; | |
5647 | } | |
5648 | } | |
5649 | else if (modifycode == NOP_EXPR) | |
5650 | { | |
8d08fdba | 5651 | /* `operator=' is not an inheritable operator. */ |
db5ae43f MS |
5652 | if (! IS_AGGR_TYPE (lhstype)) |
5653 | /* Do the default thing */; | |
5654 | else if (! TYPE_HAS_ASSIGNMENT (lhstype)) | |
1743ca29 RK |
5655 | { |
5656 | cp_error ("`%T' does not define operator=", lhstype); | |
5657 | return error_mark_node; | |
5658 | } | |
e8abc66f | 5659 | else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (lhstype) |
db5ae43f | 5660 | && TYPE_MAIN_VARIANT (lhstype) == TYPE_MAIN_VARIANT (TREE_TYPE (newrhs))) |
a5894242 | 5661 | { |
6467930b MS |
5662 | build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, |
5663 | lhs, rhs, make_node (NOP_EXPR)); | |
a5894242 MS |
5664 | |
5665 | /* Do the default thing */; | |
5666 | } | |
db5ae43f | 5667 | else |
8d08fdba MS |
5668 | { |
5669 | result = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, | |
5670 | lhs, rhs, make_node (NOP_EXPR)); | |
5671 | if (result == NULL_TREE) | |
5672 | return error_mark_node; | |
5673 | return result; | |
5674 | } | |
8d08fdba MS |
5675 | lhstype = olhstype; |
5676 | } | |
5677 | else if (PROMOTES_TO_AGGR_TYPE (lhstype, REFERENCE_TYPE)) | |
5678 | { | |
5679 | /* This case must convert to some sort of lvalue that | |
5680 | can participate in an op= operation. */ | |
5681 | tree lhs_tmp = lhs; | |
5682 | tree rhs_tmp = rhs; | |
5683 | if (build_default_binary_type_conversion (modifycode, &lhs_tmp, &rhs_tmp)) | |
5684 | { | |
5685 | lhs = stabilize_reference (lhs_tmp); | |
45537677 | 5686 | /* Forget it was ever anything else. */ |
8d08fdba MS |
5687 | olhstype = lhstype = TREE_TYPE (lhs); |
5688 | newrhs = build_binary_op (modifycode, lhs, rhs_tmp, 1); | |
5689 | } | |
5690 | else | |
b7484fbe | 5691 | { |
c91a56d2 | 5692 | cp_error ("no match for `%Q(%#T, %#T)'", modifycode, |
b7484fbe MS |
5693 | TREE_TYPE (lhs), TREE_TYPE (rhs)); |
5694 | return error_mark_node; | |
5695 | } | |
8d08fdba MS |
5696 | } |
5697 | else | |
5698 | { | |
5699 | lhs = stabilize_reference (lhs); | |
5700 | newrhs = build_binary_op (modifycode, lhs, rhs, 1); | |
c91a56d2 MS |
5701 | if (newrhs == error_mark_node) |
5702 | { | |
5703 | cp_error (" in evaluation of `%Q(%#T, %#T)'", modifycode, | |
5704 | TREE_TYPE (lhs), TREE_TYPE (rhs)); | |
5705 | return error_mark_node; | |
5706 | } | |
8d08fdba MS |
5707 | } |
5708 | ||
5709 | /* Handle a cast used as an "lvalue". | |
5710 | We have already performed any binary operator using the value as cast. | |
5711 | Now convert the result to the cast type of the lhs, | |
5712 | and then true type of the lhs and store it there; | |
5713 | then convert result back to the cast type to be the value | |
5714 | of the assignment. */ | |
5715 | ||
5716 | switch (TREE_CODE (lhs)) | |
5717 | { | |
5718 | case NOP_EXPR: | |
5719 | case CONVERT_EXPR: | |
5720 | case FLOAT_EXPR: | |
5721 | case FIX_TRUNC_EXPR: | |
5722 | case FIX_FLOOR_EXPR: | |
5723 | case FIX_ROUND_EXPR: | |
5724 | case FIX_CEIL_EXPR: | |
5725 | if (TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE | |
5726 | || TREE_CODE (TREE_TYPE (newrhs)) == FUNCTION_TYPE | |
5727 | || TREE_CODE (TREE_TYPE (newrhs)) == METHOD_TYPE | |
5728 | || TREE_CODE (TREE_TYPE (newrhs)) == OFFSET_TYPE) | |
5729 | newrhs = default_conversion (newrhs); | |
5730 | { | |
5731 | tree inner_lhs = TREE_OPERAND (lhs, 0); | |
5732 | tree result; | |
a0a33927 MS |
5733 | if (! lvalue_p (lhs) && pedantic) |
5734 | pedwarn ("cast to non-reference type used as lvalue"); | |
5735 | ||
8d08fdba MS |
5736 | result = build_modify_expr (inner_lhs, NOP_EXPR, |
5737 | convert (TREE_TYPE (inner_lhs), | |
5738 | convert (lhstype, newrhs))); | |
5739 | if (TREE_CODE (result) == ERROR_MARK) | |
5740 | return result; | |
f0e01782 | 5741 | return convert (TREE_TYPE (lhs), result); |
8d08fdba MS |
5742 | } |
5743 | } | |
8d08fdba MS |
5744 | |
5745 | /* Now we have handled acceptable kinds of LHS that are not truly lvalues. | |
5746 | Reject anything strange now. */ | |
5747 | ||
5748 | if (!lvalue_or_else (lhs, "assignment")) | |
5749 | return error_mark_node; | |
5750 | ||
5751 | GNU_xref_assign (lhs); | |
5752 | ||
5753 | /* Warn about storing in something that is `const'. */ | |
5754 | /* For C++, don't warn if this is initialization. */ | |
5755 | if (modifycode != INIT_EXPR | |
5756 | /* For assignment to `const' signature pointer/reference fields, | |
5757 | don't warn either, we already printed a better message before. */ | |
5758 | && ! (TREE_CODE (lhs) == COMPONENT_REF | |
5759 | && (IS_SIGNATURE_POINTER (TREE_TYPE (TREE_OPERAND (lhs, 0))) | |
5760 | || IS_SIGNATURE_REFERENCE (TREE_TYPE (TREE_OPERAND (lhs, 0))))) | |
5761 | && (TREE_READONLY (lhs) || TYPE_READONLY (lhstype) | |
5762 | || ((TREE_CODE (lhstype) == RECORD_TYPE | |
5763 | || TREE_CODE (lhstype) == UNION_TYPE) | |
5764 | && C_TYPE_FIELDS_READONLY (lhstype)) | |
5765 | || (TREE_CODE (lhstype) == REFERENCE_TYPE | |
5766 | && TYPE_READONLY (TREE_TYPE (lhstype))))) | |
5767 | readonly_error (lhs, "assignment", 0); | |
5768 | ||
5769 | /* If storing into a structure or union member, | |
5770 | it has probably been given type `int'. | |
5771 | Compute the type that would go with | |
5772 | the actual amount of storage the member occupies. */ | |
5773 | ||
5774 | if (TREE_CODE (lhs) == COMPONENT_REF | |
5775 | && (TREE_CODE (lhstype) == INTEGER_TYPE | |
5776 | || TREE_CODE (lhstype) == REAL_TYPE | |
5777 | || TREE_CODE (lhstype) == ENUMERAL_TYPE)) | |
a0a33927 MS |
5778 | { |
5779 | lhstype = TREE_TYPE (get_unwidened (lhs, 0)); | |
5780 | ||
5781 | /* If storing in a field that is in actuality a short or narrower | |
5782 | than one, we must store in the field in its actual type. */ | |
5783 | ||
5784 | if (lhstype != TREE_TYPE (lhs)) | |
5785 | { | |
5786 | lhs = copy_node (lhs); | |
5787 | TREE_TYPE (lhs) = lhstype; | |
5788 | } | |
5789 | } | |
8d08fdba MS |
5790 | |
5791 | /* check to see if there is an assignment to `this' */ | |
4ac14744 | 5792 | if (lhs == current_class_ptr) |
8d08fdba | 5793 | { |
2986ae00 MS |
5794 | if (flag_this_is_variable > 0 |
5795 | && DECL_NAME (current_function_decl) != NULL_TREE | |
8ccc31eb MS |
5796 | && (DECL_NAME (current_function_decl) |
5797 | != constructor_name (current_class_type))) | |
2986ae00 | 5798 | warning ("assignment to `this' not in constructor or destructor"); |
8d08fdba MS |
5799 | current_function_just_assigned_this = 1; |
5800 | } | |
5801 | ||
5802 | /* The TREE_TYPE of RHS may be TYPE_UNKNOWN. This can happen | |
5803 | when the type of RHS is not yet known, i.e. its type | |
5804 | is inherited from LHS. */ | |
5805 | rhs = require_instantiated_type (lhstype, newrhs, error_mark_node); | |
5806 | if (rhs == error_mark_node) | |
5807 | return error_mark_node; | |
5808 | newrhs = rhs; | |
5809 | ||
5810 | if (modifycode != INIT_EXPR) | |
5811 | { | |
5812 | /* Make modifycode now either a NOP_EXPR or an INIT_EXPR. */ | |
5813 | modifycode = NOP_EXPR; | |
5814 | /* Reference-bashing */ | |
5815 | if (TREE_CODE (lhstype) == REFERENCE_TYPE) | |
5816 | { | |
5817 | tree tmp = convert_from_reference (lhs); | |
5818 | lhstype = TREE_TYPE (tmp); | |
5819 | if (TYPE_SIZE (lhstype) == 0) | |
5820 | { | |
5821 | incomplete_type_error (lhs, lhstype); | |
5822 | return error_mark_node; | |
5823 | } | |
5824 | lhs = tmp; | |
5825 | olhstype = lhstype; | |
5826 | } | |
5827 | if (TREE_CODE (TREE_TYPE (newrhs)) == REFERENCE_TYPE) | |
5828 | { | |
5829 | tree tmp = convert_from_reference (newrhs); | |
5830 | if (TYPE_SIZE (TREE_TYPE (tmp)) == 0) | |
5831 | { | |
5832 | incomplete_type_error (newrhs, TREE_TYPE (tmp)); | |
5833 | return error_mark_node; | |
5834 | } | |
5835 | newrhs = tmp; | |
5836 | } | |
5837 | } | |
5838 | ||
5839 | if (TREE_SIDE_EFFECTS (lhs)) | |
5840 | lhs = stabilize_reference (lhs); | |
5841 | if (TREE_SIDE_EFFECTS (newrhs)) | |
5842 | newrhs = stabilize_reference (newrhs); | |
5843 | ||
8d08fdba MS |
5844 | /* Convert new value to destination type. */ |
5845 | ||
5846 | if (TREE_CODE (lhstype) == ARRAY_TYPE) | |
5847 | { | |
f376e137 MS |
5848 | int from_array; |
5849 | ||
44a8d0b3 MS |
5850 | if (! comptypes (lhstype, TREE_TYPE (rhs), 0)) |
5851 | { | |
5852 | cp_error ("incompatible types in assignment of `%T' to `%T'", | |
5853 | TREE_TYPE (rhs), lhstype); | |
5854 | return error_mark_node; | |
5855 | } | |
5856 | ||
39211cd5 | 5857 | /* Allow array assignment in compiler-generated code. */ |
e1cd6e56 | 5858 | if (pedantic && ! DECL_ARTIFICIAL (current_function_decl)) |
f376e137 | 5859 | pedwarn ("ANSI C++ forbids assignment of arrays"); |
39211cd5 | 5860 | |
8d08fdba MS |
5861 | /* Have to wrap this in RTL_EXPR for two cases: |
5862 | in base or member initialization and if we | |
5863 | are a branch of a ?: operator. Since we | |
5864 | can't easily know the latter, just do it always. */ | |
5865 | ||
5866 | result = make_node (RTL_EXPR); | |
5867 | ||
5868 | TREE_TYPE (result) = void_type_node; | |
5869 | do_pending_stack_adjust (); | |
5870 | start_sequence_for_rtl_expr (result); | |
5871 | ||
5872 | /* As a matter of principle, `start_sequence' should do this. */ | |
5873 | emit_note (0, -1); | |
5874 | ||
f376e137 MS |
5875 | from_array = TREE_CODE (TREE_TYPE (newrhs)) == ARRAY_TYPE |
5876 | ? 1 + (modifycode != INIT_EXPR): 0; | |
8d08fdba | 5877 | expand_vec_init (lhs, lhs, array_type_nelts (lhstype), newrhs, |
f376e137 | 5878 | from_array); |
8d08fdba MS |
5879 | |
5880 | do_pending_stack_adjust (); | |
5881 | ||
5882 | TREE_SIDE_EFFECTS (result) = 1; | |
5883 | RTL_EXPR_SEQUENCE (result) = get_insns (); | |
5884 | RTL_EXPR_RTL (result) = const0_rtx; | |
5885 | end_sequence (); | |
5886 | return result; | |
5887 | } | |
5888 | ||
5889 | if (modifycode == INIT_EXPR) | |
5890 | { | |
5891 | newrhs = convert_for_initialization (lhs, lhstype, newrhs, LOOKUP_NORMAL, | |
5892 | "assignment", NULL_TREE, 0); | |
5893 | if (lhs == DECL_RESULT (current_function_decl)) | |
5894 | { | |
5895 | if (DECL_INITIAL (lhs)) | |
5896 | warning ("return value from function receives multiple initializations"); | |
5897 | DECL_INITIAL (lhs) = newrhs; | |
5898 | } | |
5899 | } | |
5900 | else | |
5901 | { | |
e92cc029 | 5902 | /* Avoid warnings on enum bit fields. */ |
8d08fdba MS |
5903 | if (TREE_CODE (olhstype) == ENUMERAL_TYPE |
5904 | && TREE_CODE (lhstype) == INTEGER_TYPE) | |
5905 | { | |
5906 | newrhs = convert_for_assignment (olhstype, newrhs, "assignment", | |
5907 | NULL_TREE, 0); | |
6060a796 | 5908 | newrhs = convert_force (lhstype, newrhs, 0); |
8d08fdba MS |
5909 | } |
5910 | else | |
5911 | newrhs = convert_for_assignment (lhstype, newrhs, "assignment", | |
b7484fbe MS |
5912 | NULL_TREE, 0); |
5913 | if (TREE_CODE (newrhs) == CALL_EXPR | |
5914 | && TYPE_NEEDS_CONSTRUCTING (lhstype)) | |
5566b478 | 5915 | newrhs = build_cplus_new (lhstype, newrhs); |
b7484fbe | 5916 | |
e8abc66f | 5917 | /* Can't initialize directly from a TARGET_EXPR, since that would |
07674418 MS |
5918 | cause the lhs to be constructed twice, and possibly result in |
5919 | accidental self-initialization. So we force the TARGET_EXPR to be | |
be99da77 | 5920 | expanded without a target. */ |
b7484fbe | 5921 | if (TREE_CODE (newrhs) == TARGET_EXPR) |
be99da77 | 5922 | newrhs = build (COMPOUND_EXPR, TREE_TYPE (newrhs), newrhs, |
a0128b67 | 5923 | TREE_OPERAND (newrhs, 0)); |
8d08fdba MS |
5924 | } |
5925 | ||
5926 | if (TREE_CODE (newrhs) == ERROR_MARK) | |
5927 | return error_mark_node; | |
5928 | ||
5929 | if (TREE_CODE (newrhs) == COND_EXPR) | |
5930 | { | |
5931 | tree lhs1; | |
5932 | tree cond = TREE_OPERAND (newrhs, 0); | |
5933 | ||
5934 | if (TREE_SIDE_EFFECTS (lhs)) | |
5935 | cond = build_compound_expr (tree_cons | |
5936 | (NULL_TREE, lhs, | |
5937 | build_tree_list (NULL_TREE, cond))); | |
5938 | ||
5939 | /* Cannot have two identical lhs on this one tree (result) as preexpand | |
5940 | calls will rip them out and fill in RTL for them, but when the | |
5941 | rtl is generated, the calls will only be in the first side of the | |
5942 | condition, not on both, or before the conditional jump! (mrs) */ | |
5943 | lhs1 = break_out_calls (lhs); | |
5944 | ||
5945 | if (lhs == lhs1) | |
5946 | /* If there's no change, the COND_EXPR behaves like any other rhs. */ | |
5947 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
5948 | lhstype, lhs, newrhs); | |
5949 | else | |
5950 | { | |
5951 | tree result_type = TREE_TYPE (newrhs); | |
5952 | /* We have to convert each arm to the proper type because the | |
5953 | types may have been munged by constant folding. */ | |
5954 | result | |
5955 | = build (COND_EXPR, result_type, cond, | |
5956 | build_modify_expr (lhs, modifycode, | |
5957 | convert (result_type, | |
5958 | TREE_OPERAND (newrhs, 1))), | |
5959 | build_modify_expr (lhs1, modifycode, | |
5960 | convert (result_type, | |
5961 | TREE_OPERAND (newrhs, 2)))); | |
5962 | } | |
5963 | } | |
8d08fdba MS |
5964 | else |
5965 | result = build (modifycode == NOP_EXPR ? MODIFY_EXPR : INIT_EXPR, | |
5966 | lhstype, lhs, newrhs); | |
2ee887f2 | 5967 | |
8d08fdba MS |
5968 | TREE_SIDE_EFFECTS (result) = 1; |
5969 | ||
5970 | /* If we got the LHS in a different type for storing in, | |
5971 | convert the result back to the nominal type of LHS | |
5972 | so that the value we return always has the same type | |
5973 | as the LHS argument. */ | |
5974 | ||
5975 | if (olhstype == TREE_TYPE (result)) | |
5976 | return result; | |
5977 | /* Avoid warnings converting integral types back into enums | |
e92cc029 | 5978 | for enum bit fields. */ |
8d08fdba MS |
5979 | if (TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE |
5980 | && TREE_CODE (olhstype) == ENUMERAL_TYPE) | |
a3203465 MS |
5981 | { |
5982 | result = build (COMPOUND_EXPR, olhstype, result, olhs); | |
5983 | TREE_NO_UNUSED_WARNING (result) = 1; | |
5984 | return result; | |
5985 | } | |
8d08fdba MS |
5986 | return convert_for_assignment (olhstype, result, "assignment", |
5987 | NULL_TREE, 0); | |
5988 | } | |
5989 | ||
5566b478 MS |
5990 | tree |
5991 | build_x_modify_expr (lhs, modifycode, rhs) | |
5992 | tree lhs; | |
5993 | enum tree_code modifycode; | |
5994 | tree rhs; | |
5995 | { | |
5996 | if (current_template_parms) | |
5997 | return build_min_nt (MODOP_EXPR, lhs, | |
4dabb379 | 5998 | build_min_nt (modifycode, NULL_TREE, NULL_TREE), rhs); |
5566b478 MS |
5999 | |
6000 | if (modifycode != NOP_EXPR) | |
6001 | { | |
6002 | tree rval = build_opfncall (MODIFY_EXPR, LOOKUP_NORMAL, lhs, rhs, | |
6003 | make_node (modifycode)); | |
6004 | if (rval) | |
6005 | return rval; | |
6006 | } | |
6007 | return build_modify_expr (lhs, modifycode, rhs); | |
6008 | } | |
8d08fdba MS |
6009 | |
6010 | /* Return 0 if EXP is not a valid lvalue in this language | |
6011 | even though `lvalue_or_else' would accept it. */ | |
6012 | ||
6013 | int | |
6014 | language_lvalue_valid (exp) | |
6015 | tree exp; | |
6016 | { | |
6017 | return 1; | |
6018 | } | |
6019 | \f | |
ddd5a7c1 | 6020 | /* Get difference in deltas for different pointer to member function |
abc95ed3 | 6021 | types. Return integer_zero_node, if FROM cannot be converted to a |
51c184be | 6022 | TO type. If FORCE is true, then allow reverse conversions as well. */ |
e92cc029 | 6023 | |
51c184be MS |
6024 | static tree |
6025 | get_delta_difference (from, to, force) | |
6026 | tree from, to; | |
8926095f | 6027 | int force; |
51c184be MS |
6028 | { |
6029 | tree delta = integer_zero_node; | |
6030 | tree binfo; | |
6031 | ||
6032 | if (to == from) | |
6033 | return delta; | |
6034 | ||
8926095f MS |
6035 | /* Should get_base_distance here, so we can check if any thing along the |
6036 | path is virtual, and we need to make sure we stay | |
6037 | inside the real binfos when going through virtual bases. | |
6038 | Maybe we should replace virtual bases with | |
6039 | binfo_member (...CLASSTYPE_VBASECLASSES...)... (mrs) */ | |
51c184be MS |
6040 | binfo = get_binfo (from, to, 1); |
6041 | if (binfo == error_mark_node) | |
6042 | { | |
6043 | error (" in pointer to member function conversion"); | |
6044 | return delta; | |
6045 | } | |
6046 | if (binfo == 0) | |
6047 | { | |
6048 | if (!force) | |
6049 | { | |
6050 | error_not_base_type (from, to); | |
6051 | error (" in pointer to member function conversion"); | |
6052 | return delta; | |
6053 | } | |
6054 | binfo = get_binfo (to, from, 1); | |
6055 | if (binfo == error_mark_node) | |
6056 | { | |
6057 | error (" in pointer to member function conversion"); | |
6058 | return delta; | |
6059 | } | |
6060 | if (binfo == 0) | |
6061 | { | |
cdf5b885 | 6062 | cp_error ("cannot convert pointer to member of type %T to unrelated pointer to member of type %T", from, to); |
51c184be MS |
6063 | return delta; |
6064 | } | |
6065 | if (TREE_VIA_VIRTUAL (binfo)) | |
6066 | { | |
4ac14744 MS |
6067 | binfo = binfo_member (BINFO_TYPE (binfo), |
6068 | CLASSTYPE_VBASECLASSES (from)); | |
b7484fbe | 6069 | warning ("pointer to member conversion to virtual base class will only work if you are very careful"); |
51c184be | 6070 | } |
4ac14744 MS |
6071 | delta = BINFO_OFFSET (binfo); |
6072 | delta = convert (ptrdiff_type_node, delta); | |
6073 | ||
e1cd6e56 MS |
6074 | return build_binary_op (MINUS_EXPR, |
6075 | integer_zero_node, | |
4ac14744 | 6076 | delta, 1); |
51c184be MS |
6077 | } |
6078 | if (TREE_VIA_VIRTUAL (binfo)) | |
6079 | { | |
b7484fbe | 6080 | warning ("pointer to member conversion from virtual base class will only work if you are very careful"); |
51c184be MS |
6081 | } |
6082 | return BINFO_OFFSET (binfo); | |
6083 | } | |
6084 | ||
594740f3 MS |
6085 | static tree |
6086 | build_ptrmemfunc1 (type, delta, idx, pfn, delta2) | |
6087 | tree type, delta, idx, pfn, delta2; | |
6088 | { | |
6089 | tree u; | |
6090 | ||
6091 | #if 0 | |
6092 | /* This is the old way we did it. We want to avoid calling | |
6093 | digest_init, so that it can give an error if we use { } when | |
6094 | initializing a pointer to member function. */ | |
6095 | ||
6096 | if (pfn) | |
6097 | { | |
6098 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
6099 | tree_cons (pfn_identifier, pfn, NULL_TREE)); | |
6100 | } | |
6101 | else | |
6102 | { | |
6103 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
6104 | tree_cons (delta2_identifier, delta2, NULL_TREE)); | |
6105 | } | |
6106 | ||
6107 | u = build_nt (CONSTRUCTOR, NULL_TREE, | |
6108 | tree_cons (NULL_TREE, delta, | |
6109 | tree_cons (NULL_TREE, idx, | |
6110 | tree_cons (NULL_TREE, u, NULL_TREE)))); | |
6111 | ||
6112 | return digest_init (type, u, (tree*)0); | |
6113 | #else | |
6114 | tree delta_field, idx_field, pfn_or_delta2_field, pfn_field, delta2_field; | |
6115 | tree subtype; | |
6116 | int allconstant, allsimple; | |
6117 | ||
6118 | delta_field = TYPE_FIELDS (type); | |
6119 | idx_field = TREE_CHAIN (delta_field); | |
6120 | pfn_or_delta2_field = TREE_CHAIN (idx_field); | |
6121 | subtype = TREE_TYPE (pfn_or_delta2_field); | |
6122 | pfn_field = TYPE_FIELDS (subtype); | |
6123 | delta2_field = TREE_CHAIN (pfn_field); | |
6124 | ||
6125 | if (pfn) | |
6126 | { | |
6127 | allconstant = TREE_CONSTANT (pfn); | |
6128 | allsimple = initializer_constant_valid_p (pfn, TREE_TYPE (pfn)); | |
6129 | u = tree_cons (pfn_field, pfn, NULL_TREE); | |
6130 | } | |
6131 | else | |
6132 | { | |
6133 | delta2 = convert_and_check (delta_type_node, delta2); | |
6134 | allconstant = TREE_CONSTANT (delta2); | |
6135 | allsimple = initializer_constant_valid_p (delta2, TREE_TYPE (delta2)); | |
6136 | u = tree_cons (delta2_field, delta2, NULL_TREE); | |
6137 | } | |
6138 | ||
6139 | delta = convert_and_check (delta_type_node, delta); | |
6140 | idx = convert_and_check (delta_type_node, idx); | |
6141 | ||
6142 | allconstant = allconstant && TREE_CONSTANT (delta) && TREE_CONSTANT (idx); | |
6143 | allsimple = allsimple | |
6144 | && initializer_constant_valid_p (delta, TREE_TYPE (delta)) | |
6145 | && initializer_constant_valid_p (idx, TREE_TYPE (idx)); | |
6146 | ||
6147 | u = build (CONSTRUCTOR, subtype, NULL_TREE, u); | |
6148 | u = tree_cons (delta_field, delta, | |
6149 | tree_cons (idx_field, idx, | |
6150 | tree_cons (pfn_or_delta2_field, u, NULL_TREE))); | |
6151 | u = build (CONSTRUCTOR, type, NULL_TREE, u); | |
6152 | TREE_CONSTANT (u) = allconstant; | |
6153 | TREE_STATIC (u) = allconstant && allsimple; | |
6154 | return u; | |
6155 | #endif | |
6156 | } | |
6157 | ||
8d08fdba MS |
6158 | /* Build a constructor for a pointer to member function. It can be |
6159 | used to initialize global variables, local variable, or used | |
6160 | as a value in expressions. TYPE is the POINTER to METHOD_TYPE we | |
6161 | want to be. | |
6162 | ||
6163 | If FORCE is non-zero, then force this conversion, even if | |
6164 | we would rather not do it. Usually set when using an explicit | |
51c184be MS |
6165 | cast. |
6166 | ||
6167 | Return error_mark_node, if something goes wrong. */ | |
8d08fdba MS |
6168 | |
6169 | tree | |
6170 | build_ptrmemfunc (type, pfn, force) | |
6171 | tree type, pfn; | |
6172 | int force; | |
6173 | { | |
e92cc029 | 6174 | tree idx = integer_zero_node; |
8d08fdba MS |
6175 | tree delta = integer_zero_node; |
6176 | tree delta2 = integer_zero_node; | |
6177 | tree vfield_offset; | |
594740f3 | 6178 | tree npfn = NULL_TREE; |
8d08fdba MS |
6179 | tree u; |
6180 | ||
e92cc029 | 6181 | /* Handle multiple conversions of pointer to member functions. */ |
51c184be | 6182 | if (TYPE_PTRMEMFUNC_P (TREE_TYPE (pfn))) |
8d08fdba | 6183 | { |
51c184be | 6184 | tree ndelta, ndelta2, nindex; |
594740f3 MS |
6185 | tree e1, e2, e3, n; |
6186 | ||
51c184be | 6187 | /* Is is already the right type? */ |
51c184be MS |
6188 | if (type == TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn))) |
6189 | return pfn; | |
51c184be | 6190 | |
594740f3 MS |
6191 | ndelta = convert (ptrdiff_type_node, build_component_ref (pfn, delta_identifier, NULL_TREE, 0)); |
6192 | ndelta2 = convert (ptrdiff_type_node, DELTA2_FROM_PTRMEMFUNC (pfn)); | |
6193 | idx = build_component_ref (pfn, index_identifier, NULL_TREE, 0); | |
6194 | ||
6195 | n = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (pfn)))), | |
6196 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6197 | force); | |
6198 | ||
6199 | delta = build_binary_op (PLUS_EXPR, ndelta, n, 1); | |
6200 | delta2 = build_binary_op (PLUS_EXPR, ndelta2, n, 1); | |
6201 | e1 = fold (build (GT_EXPR, boolean_type_node, idx, integer_zero_node)); | |
51c184be | 6202 | |
594740f3 MS |
6203 | e2 = build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, |
6204 | NULL_TREE, delta2); | |
51c184be | 6205 | |
594740f3 MS |
6206 | pfn = PFN_FROM_PTRMEMFUNC (pfn); |
6207 | npfn = build1 (NOP_EXPR, type, pfn); | |
6208 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
51c184be | 6209 | |
594740f3 MS |
6210 | e3 = build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, npfn, |
6211 | NULL_TREE); | |
6212 | return build_conditional_expr (e1, e2, e3); | |
8d08fdba | 6213 | } |
51c184be | 6214 | |
e92cc029 | 6215 | /* Handle null pointer to member function conversions. */ |
51c184be MS |
6216 | if (integer_zerop (pfn)) |
6217 | { | |
6060a796 | 6218 | pfn = build_c_cast (type, integer_zero_node, 0); |
594740f3 MS |
6219 | return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), |
6220 | integer_zero_node, integer_zero_node, | |
6221 | pfn, NULL_TREE); | |
51c184be MS |
6222 | } |
6223 | ||
f376e137 MS |
6224 | if (TREE_CODE (pfn) == TREE_LIST |
6225 | || (TREE_CODE (pfn) == ADDR_EXPR | |
6226 | && TREE_CODE (TREE_OPERAND (pfn, 0)) == TREE_LIST)) | |
c73964b2 | 6227 | return instantiate_type (type, pfn, 1); |
a0a33927 | 6228 | |
e92cc029 | 6229 | /* Allow pointer to member conversions here. */ |
51c184be MS |
6230 | delta = get_delta_difference (TYPE_METHOD_BASETYPE (TREE_TYPE (TREE_TYPE (pfn))), |
6231 | TYPE_METHOD_BASETYPE (TREE_TYPE (type)), | |
6232 | force); | |
e1cd6e56 | 6233 | delta2 = build_binary_op (PLUS_EXPR, delta2, delta, 1); |
8d08fdba | 6234 | |
4ac14744 MS |
6235 | #if 0 |
6236 | /* We need to check the argument types to see if they are compatible | |
6237 | (any const or volatile violations. */ | |
6238 | something like this: | |
6239 | comptype (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (type))), | |
6240 | TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (TREE_TYPE (pfn)))), ?); | |
6241 | #endif | |
6242 | ||
8d08fdba MS |
6243 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) != FUNCTION_DECL) |
6244 | warning ("assuming pointer to member function is non-virtual"); | |
6245 | ||
6246 | if (TREE_CODE (TREE_OPERAND (pfn, 0)) == FUNCTION_DECL | |
6247 | && DECL_VINDEX (TREE_OPERAND (pfn, 0))) | |
6248 | { | |
e92cc029 | 6249 | /* Find the offset to the vfield pointer in the object. */ |
51c184be MS |
6250 | vfield_offset = get_binfo (DECL_CONTEXT (TREE_OPERAND (pfn, 0)), |
6251 | DECL_CLASS_CONTEXT (TREE_OPERAND (pfn, 0)), | |
6252 | 0); | |
6253 | vfield_offset = get_vfield_offset (vfield_offset); | |
8d08fdba MS |
6254 | delta2 = size_binop (PLUS_EXPR, vfield_offset, delta2); |
6255 | ||
6256 | /* Map everything down one to make room for the null pointer to member. */ | |
e92cc029 MS |
6257 | idx = size_binop (PLUS_EXPR, |
6258 | DECL_VINDEX (TREE_OPERAND (pfn, 0)), | |
6259 | integer_one_node); | |
8d08fdba MS |
6260 | } |
6261 | else | |
51c184be | 6262 | { |
e92cc029 | 6263 | idx = size_binop (MINUS_EXPR, integer_zero_node, integer_one_node); |
8d08fdba | 6264 | |
4dabb379 MS |
6265 | if (type == TREE_TYPE (pfn)) |
6266 | { | |
6267 | npfn = pfn; | |
6268 | } | |
6269 | else | |
6270 | { | |
6271 | npfn = build1 (NOP_EXPR, type, pfn); | |
6272 | TREE_CONSTANT (npfn) = TREE_CONSTANT (pfn); | |
6273 | } | |
51c184be | 6274 | } |
8d08fdba | 6275 | |
594740f3 | 6276 | return build_ptrmemfunc1 (TYPE_GET_PTRMEMFUNC_TYPE (type), delta, idx, npfn, delta2); |
8d08fdba MS |
6277 | } |
6278 | ||
6279 | /* Convert value RHS to type TYPE as preparation for an assignment | |
6280 | to an lvalue of type TYPE. | |
6281 | The real work of conversion is done by `convert'. | |
6282 | The purpose of this function is to generate error messages | |
6283 | for assignments that are not allowed in C. | |
6284 | ERRTYPE is a string to use in error messages: | |
6285 | "assignment", "return", etc. | |
6286 | ||
6287 | C++: attempts to allow `convert' to find conversions involving | |
6288 | implicit type conversion between aggregate and scalar types | |
6289 | as per 8.5.6 of C++ manual. Does not randomly dereference | |
6290 | pointers to aggregates! */ | |
6291 | ||
6292 | static tree | |
6293 | convert_for_assignment (type, rhs, errtype, fndecl, parmnum) | |
6294 | tree type, rhs; | |
6295 | char *errtype; | |
6296 | tree fndecl; | |
6297 | int parmnum; | |
6298 | { | |
6299 | register enum tree_code codel = TREE_CODE (type); | |
6300 | register tree rhstype; | |
6301 | register enum tree_code coder = TREE_CODE (TREE_TYPE (rhs)); | |
6302 | ||
6303 | if (coder == UNKNOWN_TYPE) | |
6304 | rhs = instantiate_type (type, rhs, 1); | |
6305 | ||
6306 | if (coder == ERROR_MARK) | |
6307 | return error_mark_node; | |
6308 | ||
6309 | if (codel == OFFSET_TYPE) | |
6310 | { | |
6311 | type = TREE_TYPE (type); | |
6312 | codel = TREE_CODE (type); | |
6313 | } | |
6314 | ||
6315 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
6316 | if (TREE_CODE (rhs) == NON_LVALUE_EXPR) | |
6317 | rhs = TREE_OPERAND (rhs, 0); | |
6318 | ||
6319 | if (rhs == error_mark_node) | |
6320 | return error_mark_node; | |
6321 | ||
6322 | if (TREE_VALUE (rhs) == error_mark_node) | |
6323 | return error_mark_node; | |
6324 | ||
6325 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6326 | { | |
6327 | rhs = resolve_offset_ref (rhs); | |
6328 | if (rhs == error_mark_node) | |
6329 | return error_mark_node; | |
6330 | rhstype = TREE_TYPE (rhs); | |
6331 | coder = TREE_CODE (rhstype); | |
6332 | } | |
6333 | ||
6334 | if (TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE | |
6335 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE | |
6336 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6337 | rhs = default_conversion (rhs); | |
6338 | else if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
6339 | rhs = convert_from_reference (rhs); | |
6340 | ||
6341 | rhstype = TREE_TYPE (rhs); | |
6342 | coder = TREE_CODE (rhstype); | |
6343 | ||
6344 | /* This should no longer change types on us. */ | |
6345 | if (TREE_CODE (rhs) == CONST_DECL) | |
6346 | rhs = DECL_INITIAL (rhs); | |
6347 | else if (TREE_READONLY_DECL_P (rhs)) | |
6348 | rhs = decl_constant_value (rhs); | |
6349 | ||
6350 | if (type == rhstype) | |
6351 | { | |
6352 | overflow_warning (rhs); | |
6353 | return rhs; | |
6354 | } | |
6355 | ||
6356 | if (coder == VOID_TYPE) | |
6357 | { | |
6358 | error ("void value not ignored as it ought to be"); | |
6359 | return error_mark_node; | |
6360 | } | |
6361 | /* Arithmetic types all interconvert. */ | |
2986ae00 MS |
6362 | if ((codel == INTEGER_TYPE || codel == REAL_TYPE || codel == BOOLEAN_TYPE) |
6363 | && (coder == INTEGER_TYPE || coder == REAL_TYPE || coder == BOOLEAN_TYPE)) | |
8d08fdba MS |
6364 | { |
6365 | /* But we should warn if assigning REAL_TYPE to INTEGER_TYPE. */ | |
6366 | if (coder == REAL_TYPE && codel == INTEGER_TYPE) | |
6367 | { | |
6368 | if (fndecl) | |
6369 | cp_warning ("`%T' used for argument %P of `%D'", | |
6370 | rhstype, parmnum, fndecl); | |
6371 | else | |
6372 | cp_warning ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6373 | } | |
6374 | /* And we should warn if assigning a negative value to | |
6375 | an unsigned variable. */ | |
2986ae00 | 6376 | else if (TREE_UNSIGNED (type) && codel != BOOLEAN_TYPE) |
8d08fdba MS |
6377 | { |
6378 | if (TREE_CODE (rhs) == INTEGER_CST | |
6379 | && TREE_NEGATED_INT (rhs)) | |
6380 | { | |
6381 | if (fndecl) | |
6382 | cp_warning ("negative value `%E' passed as argument %P of `%D'", | |
6383 | rhs, parmnum, fndecl); | |
6384 | else | |
6385 | cp_warning ("%s of negative value `%E' to `%T'", | |
6386 | errtype, rhs, type); | |
6387 | } | |
6388 | overflow_warning (rhs); | |
6389 | if (TREE_CONSTANT (rhs)) | |
6390 | rhs = fold (rhs); | |
6391 | } | |
6392 | ||
6393 | return convert_and_check (type, rhs); | |
6394 | } | |
6395 | /* Conversions involving enums. */ | |
6396 | else if ((codel == ENUMERAL_TYPE | |
6060a796 | 6397 | && (INTEGRAL_CODE_P (coder) || coder == REAL_TYPE)) |
8d08fdba | 6398 | || (coder == ENUMERAL_TYPE |
6060a796 | 6399 | && (INTEGRAL_CODE_P (codel) || codel == REAL_TYPE))) |
8d08fdba | 6400 | { |
878cd289 | 6401 | return cp_convert (type, rhs, CONV_IMPLICIT, LOOKUP_NORMAL); |
8d08fdba MS |
6402 | } |
6403 | /* Conversions among pointers */ | |
6404 | else if (codel == POINTER_TYPE | |
6405 | && (coder == POINTER_TYPE | |
6406 | || (coder == RECORD_TYPE | |
6407 | && (IS_SIGNATURE_POINTER (rhstype) | |
6408 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
6409 | { | |
6410 | register tree ttl = TREE_TYPE (type); | |
6411 | register tree ttr; | |
e1cd6e56 | 6412 | int ctt = 0; |
8d08fdba MS |
6413 | |
6414 | if (coder == RECORD_TYPE) | |
6415 | { | |
6416 | rhs = build_optr_ref (rhs); | |
6417 | rhstype = TREE_TYPE (rhs); | |
6418 | } | |
6419 | ttr = TREE_TYPE (rhstype); | |
6420 | ||
6421 | /* If both pointers are of aggregate type, then we | |
6422 | can give better error messages, and save some work | |
6423 | as well. */ | |
6424 | if (TREE_CODE (ttl) == RECORD_TYPE && TREE_CODE (ttr) == RECORD_TYPE) | |
6425 | { | |
6426 | tree binfo; | |
6427 | ||
6428 | if (TYPE_MAIN_VARIANT (ttl) == TYPE_MAIN_VARIANT (ttr) | |
6429 | || type == class_star_type_node | |
6430 | || rhstype == class_star_type_node) | |
6431 | binfo = TYPE_BINFO (ttl); | |
6432 | else | |
6433 | binfo = get_binfo (ttl, ttr, 1); | |
6434 | ||
6435 | if (binfo == error_mark_node) | |
6436 | return error_mark_node; | |
6437 | if (binfo == 0) | |
6438 | return error_not_base_type (ttl, ttr); | |
6439 | ||
6440 | if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) | |
6441 | { | |
6442 | if (fndecl) | |
7177d104 | 6443 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6444 | rhstype, parmnum, fndecl); |
6445 | else | |
7177d104 | 6446 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6447 | errtype, type, rhstype); |
6448 | } | |
6449 | if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) | |
6450 | { | |
6451 | if (fndecl) | |
7177d104 | 6452 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6453 | rhstype, parmnum, fndecl); |
6454 | else | |
7177d104 | 6455 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6456 | errtype, type, rhstype); |
6457 | } | |
6458 | } | |
6459 | ||
6460 | /* Any non-function converts to a [const][volatile] void * | |
6461 | and vice versa; otherwise, targets must be the same. | |
6462 | Meanwhile, the lhs target must have all the qualifiers of the rhs. */ | |
6463 | else if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6464 | || TYPE_MAIN_VARIANT (ttr) == void_type_node | |
e1cd6e56 | 6465 | || (ctt = comp_target_types (type, rhstype, 1)) |
8d08fdba MS |
6466 | || (unsigned_type (TYPE_MAIN_VARIANT (ttl)) |
6467 | == unsigned_type (TYPE_MAIN_VARIANT (ttr)))) | |
6468 | { | |
6469 | /* ARM $4.8, commentary on p39. */ | |
6470 | if (TYPE_MAIN_VARIANT (ttl) == void_type_node | |
6471 | && TREE_CODE (ttr) == OFFSET_TYPE) | |
6472 | { | |
e1cd6e56 | 6473 | cp_error ("no standard conversion from `%T' to `void *'", ttr); |
8d08fdba MS |
6474 | return error_mark_node; |
6475 | } | |
6476 | ||
d11ad92e | 6477 | if (ctt < 0 && TYPE_MAIN_VARIANT (ttl) != TYPE_MAIN_VARIANT (ttr)) |
e1cd6e56 | 6478 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", |
f30432d7 | 6479 | rhstype, type); |
e1cd6e56 | 6480 | |
8d08fdba MS |
6481 | if (TYPE_MAIN_VARIANT (ttl) != void_type_node |
6482 | && TYPE_MAIN_VARIANT (ttr) == void_type_node | |
c73964b2 | 6483 | && ! null_ptr_cst_p (rhs)) |
2986ae00 MS |
6484 | { |
6485 | if (coder == RECORD_TYPE) | |
e1cd6e56 MS |
6486 | cp_pedwarn ("implicit conversion of signature pointer to type `%T'", |
6487 | type); | |
2986ae00 MS |
6488 | else |
6489 | pedwarn ("ANSI C++ forbids implicit conversion from `void *' in %s", | |
6490 | errtype); | |
6491 | } | |
8d08fdba MS |
6492 | /* Const and volatile mean something different for function types, |
6493 | so the usual warnings are not appropriate. */ | |
6494 | else if ((TREE_CODE (ttr) != FUNCTION_TYPE && TREE_CODE (ttr) != METHOD_TYPE) | |
6495 | || (TREE_CODE (ttl) != FUNCTION_TYPE && TREE_CODE (ttl) != METHOD_TYPE)) | |
6496 | { | |
6497 | if (TREE_CODE (ttl) == OFFSET_TYPE | |
6498 | && binfo_member (TYPE_OFFSET_BASETYPE (ttr), | |
6499 | CLASSTYPE_VBASECLASSES (TYPE_OFFSET_BASETYPE (ttl)))) | |
6500 | { | |
6501 | sorry ("%s between pointer to members converting across virtual baseclasses", errtype); | |
6502 | return error_mark_node; | |
6503 | } | |
2986ae00 | 6504 | else if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr)) |
8d08fdba MS |
6505 | { |
6506 | if (fndecl) | |
7177d104 | 6507 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6508 | rhstype, parmnum, fndecl); |
6509 | else | |
7177d104 | 6510 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6511 | errtype, type, rhstype); |
6512 | } | |
2986ae00 | 6513 | else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr)) |
8d08fdba MS |
6514 | { |
6515 | if (fndecl) | |
7177d104 | 6516 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6517 | rhstype, parmnum, fndecl); |
6518 | else | |
7177d104 | 6519 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6520 | errtype, type, rhstype); |
6521 | } | |
2986ae00 MS |
6522 | else if (TREE_CODE (ttl) == TREE_CODE (ttr) |
6523 | && ! comp_target_types (type, rhstype, 1)) | |
6524 | { | |
6525 | if (fndecl) | |
6526 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signedness", | |
6527 | rhstype, parmnum, fndecl); | |
6528 | else | |
6529 | cp_pedwarn ("%s to `%T' from `%T' changes signedness", | |
6530 | errtype, type, rhstype); | |
6531 | } | |
8d08fdba MS |
6532 | } |
6533 | } | |
6534 | else if (TREE_CODE (ttr) == OFFSET_TYPE | |
6535 | && TREE_CODE (ttl) != OFFSET_TYPE) | |
6536 | { | |
6537 | /* Normally, pointers to different type codes (other | |
6538 | than void) are not compatible, but we perform | |
6539 | some type instantiation if that resolves the | |
6540 | ambiguity of (X Y::*) and (X *). */ | |
6541 | ||
4ac14744 | 6542 | if (current_class_ptr) |
8d08fdba MS |
6543 | { |
6544 | if (TREE_CODE (rhs) == INTEGER_CST) | |
6545 | { | |
6546 | rhs = build (PLUS_EXPR, build_pointer_type (TREE_TYPE (ttr)), | |
4ac14744 | 6547 | current_class_ptr, rhs); |
8d08fdba MS |
6548 | return convert_for_assignment (type, rhs, |
6549 | errtype, fndecl, parmnum); | |
6550 | } | |
6551 | } | |
6552 | if (TREE_CODE (ttl) == METHOD_TYPE) | |
6553 | error ("%s between pointer-to-method and pointer-to-member types", | |
6554 | errtype); | |
6555 | else | |
6556 | error ("%s between pointer and pointer-to-member types", errtype); | |
6557 | return error_mark_node; | |
6558 | } | |
6559 | else | |
6560 | { | |
a0a33927 MS |
6561 | int add_quals = 0, const_parity = 0, volatile_parity = 0; |
6562 | int left_const = 1; | |
8d08fdba MS |
6563 | int unsigned_parity; |
6564 | int nptrs = 0; | |
6565 | ||
a0a33927 MS |
6566 | /* This code is basically a duplicate of comp_ptr_ttypes_real. */ |
6567 | for (; ; ttl = TREE_TYPE (ttl), ttr = TREE_TYPE (ttr)) | |
8d08fdba MS |
6568 | { |
6569 | nptrs -= 1; | |
5566b478 MS |
6570 | const_parity |= (TYPE_READONLY (ttl) < TYPE_READONLY (ttr)); |
6571 | volatile_parity |= (TYPE_VOLATILE (ttl) < TYPE_VOLATILE (ttr)); | |
a0a33927 MS |
6572 | |
6573 | if (! left_const | |
6574 | && (TYPE_READONLY (ttl) > TYPE_READONLY (ttr) | |
6575 | || TYPE_VOLATILE (ttl) > TYPE_VOLATILE (ttr))) | |
6576 | add_quals = 1; | |
6577 | left_const &= TYPE_READONLY (ttl); | |
6578 | ||
a292b002 MS |
6579 | if (TREE_CODE (ttl) != POINTER_TYPE |
6580 | || TREE_CODE (ttr) != POINTER_TYPE) | |
a0a33927 | 6581 | break; |
8d08fdba MS |
6582 | } |
6583 | unsigned_parity = TREE_UNSIGNED (ttl) - TREE_UNSIGNED (ttr); | |
6584 | if (unsigned_parity) | |
a0a33927 MS |
6585 | { |
6586 | if (TREE_UNSIGNED (ttl)) | |
6587 | ttr = unsigned_type (ttr); | |
6588 | else | |
6589 | ttl = unsigned_type (ttl); | |
6590 | } | |
8d08fdba | 6591 | |
e1cd6e56 | 6592 | if (comp_target_types (ttl, ttr, nptrs) > 0) |
8d08fdba | 6593 | { |
a0a33927 MS |
6594 | if (add_quals) |
6595 | { | |
6596 | if (fndecl) | |
6597 | cp_pedwarn ("passing `%T' as argument %P of `%D' adds cv-quals without intervening `const'", | |
6598 | rhstype, parmnum, fndecl); | |
6599 | else | |
6600 | cp_pedwarn ("%s to `%T' from `%T' adds cv-quals without intervening `const'", | |
6601 | errtype, type, rhstype); | |
6602 | } | |
8d08fdba MS |
6603 | if (const_parity) |
6604 | { | |
6605 | if (fndecl) | |
a0a33927 | 6606 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards const", |
8d08fdba MS |
6607 | rhstype, parmnum, fndecl); |
6608 | else | |
a0a33927 | 6609 | cp_pedwarn ("%s to `%T' from `%T' discards const", |
8d08fdba MS |
6610 | errtype, type, rhstype); |
6611 | } | |
6612 | if (volatile_parity) | |
6613 | { | |
6614 | if (fndecl) | |
a0a33927 | 6615 | cp_pedwarn ("passing `%T' as argument %P of `%D' discards volatile", |
8d08fdba MS |
6616 | rhstype, parmnum, fndecl); |
6617 | else | |
a0a33927 | 6618 | cp_pedwarn ("%s to `%T' from `%T' discards volatile", |
8d08fdba MS |
6619 | errtype, type, rhstype); |
6620 | } | |
6621 | if (unsigned_parity > 0) | |
6622 | { | |
6623 | if (fndecl) | |
6624 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes signed to unsigned", | |
6625 | rhstype, parmnum, fndecl); | |
6626 | else | |
6627 | cp_pedwarn ("%s to `%T' from `%T' changes signed to unsigned", | |
6628 | errtype, type, rhstype); | |
6629 | } | |
6630 | else if (unsigned_parity < 0) | |
6631 | { | |
6632 | if (fndecl) | |
6633 | cp_pedwarn ("passing `%T' as argument %P of `%D' changes unsigned to signed", | |
6634 | rhstype, parmnum, fndecl); | |
6635 | else | |
6636 | cp_pedwarn ("%s to `%T' from `%T' changes unsigned to signed", | |
6637 | errtype, type, rhstype); | |
6638 | } | |
6639 | ||
6640 | /* C++ is not so friendly about converting function and | |
6641 | member function pointers as C. Emit warnings here. */ | |
6642 | if (TREE_CODE (ttl) == FUNCTION_TYPE | |
6643 | || TREE_CODE (ttl) == METHOD_TYPE) | |
6644 | if (! comptypes (ttl, ttr, 0)) | |
6645 | { | |
6646 | warning ("conflicting function types in %s:", errtype); | |
6647 | cp_warning ("\t`%T' != `%T'", type, rhstype); | |
6648 | } | |
6649 | } | |
8d08fdba MS |
6650 | else |
6651 | { | |
6652 | if (fndecl) | |
6653 | cp_error ("passing `%T' as argument %P of `%D'", | |
6654 | rhstype, parmnum, fndecl); | |
6655 | else | |
6656 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6657 | return error_mark_node; | |
6658 | } | |
6659 | } | |
6660 | return convert (type, rhs); | |
6661 | } | |
6662 | else if (codel == POINTER_TYPE && coder == INTEGER_TYPE) | |
6663 | { | |
6664 | /* An explicit constant 0 can convert to a pointer, | |
6665 | but not a 0 that results from casting or folding. */ | |
6666 | if (! (TREE_CODE (rhs) == INTEGER_CST && integer_zerop (rhs))) | |
6667 | { | |
6668 | if (fndecl) | |
6669 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6670 | rhstype, parmnum, fndecl); | |
6671 | else | |
6672 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6673 | errtype, type, rhstype); | |
8d08fdba | 6674 | } |
c73964b2 | 6675 | return convert (type, rhs); |
8d08fdba | 6676 | } |
e1cd6e56 | 6677 | else if (codel == INTEGER_TYPE |
8d08fdba MS |
6678 | && (coder == POINTER_TYPE |
6679 | || (coder == RECORD_TYPE | |
6680 | && (IS_SIGNATURE_POINTER (rhstype) | |
f376e137 | 6681 | || TYPE_PTRMEMFUNC_FLAG (rhstype) |
8d08fdba MS |
6682 | || IS_SIGNATURE_REFERENCE (rhstype))))) |
6683 | { | |
6684 | if (fndecl) | |
6685 | cp_pedwarn ("passing `%T' to argument %P of `%D' lacks a cast", | |
6686 | rhstype, parmnum, fndecl); | |
6687 | else | |
6688 | cp_pedwarn ("%s to `%T' from `%T' lacks a cast", | |
6689 | errtype, type, rhstype); | |
6690 | return convert (type, rhs); | |
6691 | } | |
e1cd6e56 MS |
6692 | else if (codel == BOOLEAN_TYPE |
6693 | && (coder == POINTER_TYPE | |
6694 | || (coder == RECORD_TYPE | |
6695 | && (IS_SIGNATURE_POINTER (rhstype) | |
6696 | || TYPE_PTRMEMFUNC_FLAG (rhstype) | |
6697 | || IS_SIGNATURE_REFERENCE (rhstype))))) | |
6698 | return convert (type, rhs); | |
8d08fdba MS |
6699 | |
6700 | /* C++ */ | |
71851aaa | 6701 | else if (((coder == POINTER_TYPE |
8d08fdba | 6702 | && TREE_CODE (TREE_TYPE (rhstype)) == METHOD_TYPE) |
51c184be | 6703 | || integer_zerop (rhs) |
28cbf42c | 6704 | || TYPE_PTRMEMFUNC_P (rhstype)) |
8d08fdba MS |
6705 | && TYPE_PTRMEMFUNC_P (type)) |
6706 | { | |
28cbf42c MS |
6707 | tree ttl = TYPE_PTRMEMFUNC_FN_TYPE (type); |
6708 | tree ttr = (TREE_CODE (rhstype) == POINTER_TYPE ? rhstype | |
6709 | : TYPE_PTRMEMFUNC_FN_TYPE (type)); | |
6710 | int ctt = comp_target_types (ttl, ttr, 1); | |
6711 | ||
6712 | if (ctt < 0) | |
6713 | cp_pedwarn ("converting `%T' to `%T' is a contravariance violation", | |
6714 | ttr, ttl); | |
6715 | else if (ctt == 0) | |
6716 | cp_error ("%s to `%T' from `%T'", errtype, ttl, ttr); | |
6717 | ||
e92cc029 | 6718 | /* compatible pointer to member functions. */ |
28cbf42c | 6719 | return build_ptrmemfunc (ttl, rhs, 0); |
8d08fdba MS |
6720 | } |
6721 | else if (codel == ERROR_MARK || coder == ERROR_MARK) | |
6722 | return error_mark_node; | |
6723 | ||
6724 | /* This should no longer happen. References are initialized via | |
6725 | `convert_for_initialization'. They should otherwise be | |
6726 | bashed before coming here. */ | |
6727 | else if (codel == REFERENCE_TYPE) | |
db5ae43f | 6728 | my_friendly_abort (317); |
8d08fdba | 6729 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (rhs))) |
51c184be MS |
6730 | { |
6731 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
6732 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
6733 | return nrhs; | |
6734 | } | |
8d08fdba MS |
6735 | else if (TYPE_HAS_CONSTRUCTOR (type) || IS_AGGR_TYPE (TREE_TYPE (rhs))) |
6736 | return convert (type, rhs); | |
6737 | ||
6738 | cp_error ("%s to `%T' from `%T'", errtype, type, rhstype); | |
6739 | return error_mark_node; | |
6740 | } | |
6741 | ||
6742 | /* Convert RHS to be of type TYPE. If EXP is non-zero, | |
6743 | it is the target of the initialization. | |
6744 | ERRTYPE is a string to use in error messages. | |
6745 | ||
6746 | Two major differences between the behavior of | |
6747 | `convert_for_assignment' and `convert_for_initialization' | |
6748 | are that references are bashed in the former, while | |
6749 | copied in the latter, and aggregates are assigned in | |
6750 | the former (operator=) while initialized in the | |
6751 | latter (X(X&)). | |
6752 | ||
6753 | If using constructor make sure no conversion operator exists, if one does | |
878cd289 MS |
6754 | exist, an ambiguity exists. |
6755 | ||
6756 | If flags doesn't include LOOKUP_COMPLAIN, don't complain about anything. */ | |
e92cc029 | 6757 | |
8d08fdba MS |
6758 | tree |
6759 | convert_for_initialization (exp, type, rhs, flags, errtype, fndecl, parmnum) | |
6760 | tree exp, type, rhs; | |
6761 | int flags; | |
6762 | char *errtype; | |
6763 | tree fndecl; | |
6764 | int parmnum; | |
6765 | { | |
6766 | register enum tree_code codel = TREE_CODE (type); | |
6767 | register tree rhstype; | |
6768 | register enum tree_code coder; | |
6769 | ||
6770 | /* build_c_cast puts on a NOP_EXPR to make the result not an lvalue. | |
6771 | Strip such NOP_EXPRs, since RHS is used in non-lvalue context. */ | |
6772 | if (TREE_CODE (rhs) == NOP_EXPR | |
a0a33927 MS |
6773 | && TREE_TYPE (rhs) == TREE_TYPE (TREE_OPERAND (rhs, 0)) |
6774 | && codel != REFERENCE_TYPE) | |
8d08fdba MS |
6775 | rhs = TREE_OPERAND (rhs, 0); |
6776 | ||
6777 | if (rhs == error_mark_node | |
6778 | || (TREE_CODE (rhs) == TREE_LIST && TREE_VALUE (rhs) == error_mark_node)) | |
6779 | return error_mark_node; | |
6780 | ||
6781 | if (TREE_CODE (TREE_TYPE (rhs)) == OFFSET_TYPE) | |
6782 | { | |
6783 | rhs = resolve_offset_ref (rhs); | |
6784 | if (rhs == error_mark_node) | |
6785 | return error_mark_node; | |
8d08fdba MS |
6786 | } |
6787 | ||
8ccc31eb MS |
6788 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) |
6789 | rhs = convert_from_reference (rhs); | |
6790 | ||
8d08fdba | 6791 | if ((TREE_CODE (TREE_TYPE (rhs)) == ARRAY_TYPE |
8ccc31eb MS |
6792 | && TREE_CODE (type) != ARRAY_TYPE |
6793 | && (TREE_CODE (type) != REFERENCE_TYPE | |
6794 | || TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE)) | |
8d08fdba MS |
6795 | || TREE_CODE (TREE_TYPE (rhs)) == FUNCTION_TYPE |
6796 | || TREE_CODE (TREE_TYPE (rhs)) == METHOD_TYPE) | |
6797 | rhs = default_conversion (rhs); | |
6798 | ||
6799 | rhstype = TREE_TYPE (rhs); | |
6800 | coder = TREE_CODE (rhstype); | |
6801 | ||
6802 | if (coder == UNKNOWN_TYPE) | |
6803 | { | |
6804 | rhs = instantiate_type (type, rhs, 1); | |
6805 | rhstype = TREE_TYPE (rhs); | |
6806 | coder = TREE_CODE (rhstype); | |
6807 | } | |
6808 | ||
6809 | if (coder == ERROR_MARK) | |
6810 | return error_mark_node; | |
6811 | ||
8d08fdba MS |
6812 | /* We accept references to incomplete types, so we can |
6813 | return here before checking if RHS is of complete type. */ | |
6814 | ||
6815 | if (codel == REFERENCE_TYPE) | |
2986ae00 MS |
6816 | { |
6817 | /* This should eventually happen in convert_arguments. */ | |
6818 | extern int warningcount, errorcount; | |
6819 | int savew, savee; | |
6820 | ||
6821 | if (fndecl) | |
6822 | savew = warningcount, savee = errorcount; | |
6823 | rhs = convert_to_reference (type, rhs, CONV_IMPLICIT, flags, | |
6824 | exp ? exp : error_mark_node); | |
6825 | if (fndecl) | |
6826 | { | |
6827 | if (warningcount > savew) | |
6828 | cp_warning_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6829 | else if (errorcount > savee) | |
6830 | cp_error_at ("in passing argument %P of `%+D'", parmnum, fndecl); | |
6831 | } | |
6832 | return rhs; | |
6833 | } | |
8d08fdba MS |
6834 | |
6835 | rhs = require_complete_type (rhs); | |
6836 | if (rhs == error_mark_node) | |
6837 | return error_mark_node; | |
6838 | ||
6839 | if (exp != 0) exp = require_complete_type (exp); | |
6840 | if (exp == error_mark_node) | |
6841 | return error_mark_node; | |
6842 | ||
6843 | if (TREE_CODE (rhstype) == REFERENCE_TYPE) | |
6844 | rhstype = TREE_TYPE (rhstype); | |
6845 | ||
6467930b MS |
6846 | type = complete_type (type); |
6847 | ||
8d08fdba MS |
6848 | if (TYPE_LANG_SPECIFIC (type) |
6849 | && (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type))) | |
6850 | return build_signature_pointer_constructor (type, rhs); | |
6851 | ||
f376e137 MS |
6852 | if (IS_AGGR_TYPE (type) |
6853 | && (TYPE_NEEDS_CONSTRUCTING (type) || TREE_HAS_CONSTRUCTOR (rhs))) | |
8d08fdba MS |
6854 | { |
6855 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype)) | |
6856 | { | |
6857 | /* This is sufficient to perform initialization. No need, | |
6858 | apparently, to go through X(X&) to do first-cut | |
6859 | initialization. Return through a TARGET_EXPR so that we get | |
6860 | cleanups if it is used. */ | |
6861 | if (TREE_CODE (rhs) == CALL_EXPR) | |
6862 | { | |
5566b478 | 6863 | rhs = build_cplus_new (type, rhs); |
8d08fdba MS |
6864 | return rhs; |
6865 | } | |
6866 | /* Handle the case of default parameter initialization and | |
6867 | initialization of static variables. */ | |
db5ae43f MS |
6868 | else if (TREE_CODE (rhs) == TARGET_EXPR) |
6869 | return rhs; | |
8d08fdba MS |
6870 | else if (TREE_CODE (rhs) == INDIRECT_REF && TREE_HAS_CONSTRUCTOR (rhs)) |
6871 | { | |
6872 | my_friendly_assert (TREE_CODE (TREE_OPERAND (rhs, 0)) == CALL_EXPR, 318); | |
6873 | if (exp) | |
6874 | { | |
6875 | my_friendly_assert (TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) == NULL_TREE, 316); | |
6876 | TREE_VALUE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 1)) | |
6877 | = build_unary_op (ADDR_EXPR, exp, 0); | |
6878 | } | |
6879 | else | |
5566b478 | 6880 | rhs = build_cplus_new (type, TREE_OPERAND (rhs, 0)); |
8d08fdba MS |
6881 | return rhs; |
6882 | } | |
e8abc66f MS |
6883 | else if (TYPE_HAS_TRIVIAL_INIT_REF (type)) |
6884 | return rhs; | |
8d08fdba MS |
6885 | } |
6886 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (rhstype) | |
6887 | || (IS_AGGR_TYPE (rhstype) && UNIQUELY_DERIVED_FROM_P (type, rhstype))) | |
6888 | { | |
6889 | if (TYPE_HAS_INIT_REF (type)) | |
6890 | { | |
fc378698 | 6891 | tree init = build_method_call (exp, ctor_identifier, |
8d08fdba | 6892 | build_tree_list (NULL_TREE, rhs), |
700f8a87 | 6893 | TYPE_BINFO (type), LOOKUP_NORMAL); |
8d08fdba MS |
6894 | |
6895 | if (init == error_mark_node) | |
6896 | return error_mark_node; | |
6897 | ||
6898 | if (exp == 0) | |
6899 | { | |
5566b478 | 6900 | exp = build_cplus_new (type, init); |
8d08fdba MS |
6901 | return exp; |
6902 | } | |
6903 | ||
6904 | return build (COMPOUND_EXPR, type, init, exp); | |
6905 | } | |
6906 | ||
6907 | /* ??? The following warnings are turned off because | |
6908 | this is another place where the default X(X&) constructor | |
6909 | is implemented. */ | |
6910 | if (TYPE_HAS_ASSIGNMENT (type)) | |
6911 | cp_warning ("bitwise copy: `%T' defines operator=", type); | |
6912 | ||
6913 | if (TREE_CODE (TREE_TYPE (rhs)) == REFERENCE_TYPE) | |
6914 | rhs = convert_from_reference (rhs); | |
6915 | if (type != rhstype) | |
51c184be MS |
6916 | { |
6917 | tree nrhs = build1 (NOP_EXPR, type, rhs); | |
6918 | TREE_CONSTANT (nrhs) = TREE_CONSTANT (rhs); | |
6919 | rhs = nrhs; | |
6920 | } | |
8d08fdba MS |
6921 | return rhs; |
6922 | } | |
6923 | ||
fc378698 MS |
6924 | return cp_convert (type, rhs, CONV_OLD_CONVERT, |
6925 | flags | LOOKUP_NO_CONVERSION); | |
8d08fdba MS |
6926 | } |
6927 | ||
6928 | if (type == TREE_TYPE (rhs)) | |
6929 | { | |
6930 | if (TREE_READONLY_DECL_P (rhs)) | |
6931 | rhs = decl_constant_value (rhs); | |
6932 | return rhs; | |
6933 | } | |
6934 | ||
6935 | return convert_for_assignment (type, rhs, errtype, fndecl, parmnum); | |
6936 | } | |
6937 | \f | |
6938 | /* Expand an ASM statement with operands, handling output operands | |
6939 | that are not variables or INDIRECT_REFS by transforming such | |
6940 | cases into cases that expand_asm_operands can handle. | |
6941 | ||
6942 | Arguments are same as for expand_asm_operands. | |
6943 | ||
6944 | We don't do default conversions on all inputs, because it can screw | |
6945 | up operands that are expected to be in memory. */ | |
6946 | ||
6947 | void | |
6948 | c_expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line) | |
6949 | tree string, outputs, inputs, clobbers; | |
6950 | int vol; | |
6951 | char *filename; | |
6952 | int line; | |
6953 | { | |
6954 | int noutputs = list_length (outputs); | |
6955 | register int i; | |
6956 | /* o[I] is the place that output number I should be written. */ | |
6957 | register tree *o = (tree *) alloca (noutputs * sizeof (tree)); | |
6958 | register tree tail; | |
6959 | ||
6960 | /* Record the contents of OUTPUTS before it is modified. */ | |
6961 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6962 | o[i] = TREE_VALUE (tail); | |
6963 | ||
6964 | /* Generate the ASM_OPERANDS insn; | |
6965 | store into the TREE_VALUEs of OUTPUTS some trees for | |
6966 | where the values were actually stored. */ | |
6967 | expand_asm_operands (string, outputs, inputs, clobbers, vol, filename, line); | |
6968 | ||
6969 | /* Copy all the intermediate outputs into the specified outputs. */ | |
6970 | for (i = 0, tail = outputs; tail; tail = TREE_CHAIN (tail), i++) | |
6971 | { | |
6972 | if (o[i] != TREE_VALUE (tail)) | |
6973 | { | |
6974 | expand_expr (build_modify_expr (o[i], NOP_EXPR, TREE_VALUE (tail)), | |
6975 | const0_rtx, VOIDmode, 0); | |
6976 | free_temp_slots (); | |
6977 | } | |
6978 | /* Detect modification of read-only values. | |
6979 | (Otherwise done by build_modify_expr.) */ | |
6980 | else | |
6981 | { | |
6982 | tree type = TREE_TYPE (o[i]); | |
6983 | if (TYPE_READONLY (type) | |
6984 | || ((TREE_CODE (type) == RECORD_TYPE | |
6985 | || TREE_CODE (type) == UNION_TYPE) | |
6986 | && C_TYPE_FIELDS_READONLY (type))) | |
6987 | readonly_error (o[i], "modification by `asm'", 1); | |
6988 | } | |
6989 | } | |
6990 | ||
6991 | /* Those MODIFY_EXPRs could do autoincrements. */ | |
6992 | emit_queue (); | |
6993 | } | |
6994 | \f | |
6995 | /* Expand a C `return' statement. | |
6996 | RETVAL is the expression for what to return, | |
6997 | or a null pointer for `return;' with no value. | |
6998 | ||
6999 | C++: upon seeing a `return', we must call destructors on all | |
7000 | variables in scope which had constructors called on them. | |
7001 | This means that if in a destructor, the base class destructors | |
7002 | must be called before returning. | |
7003 | ||
7004 | The RETURN statement in C++ has initialization semantics. */ | |
7005 | ||
7006 | void | |
7007 | c_expand_return (retval) | |
7008 | tree retval; | |
7009 | { | |
7010 | extern struct nesting *cond_stack, *loop_stack, *case_stack; | |
7011 | extern tree dtor_label, ctor_label; | |
7012 | tree result = DECL_RESULT (current_function_decl); | |
7013 | tree valtype = TREE_TYPE (result); | |
8d08fdba MS |
7014 | int returns_value = 1; |
7015 | ||
7016 | if (TREE_THIS_VOLATILE (current_function_decl)) | |
7017 | warning ("function declared `noreturn' has a `return' statement"); | |
7018 | ||
7019 | if (retval == error_mark_node) | |
7020 | { | |
7021 | current_function_returns_null = 1; | |
7022 | return; | |
7023 | } | |
7024 | ||
5566b478 MS |
7025 | if (current_template_parms) |
7026 | { | |
7027 | add_tree (build_min_nt (RETURN_STMT, retval)); | |
7028 | return; | |
7029 | } | |
7030 | ||
8d08fdba MS |
7031 | if (retval == NULL_TREE) |
7032 | { | |
7033 | /* A non-named return value does not count. */ | |
7034 | ||
7035 | /* Can't just return from a destructor. */ | |
7036 | if (dtor_label) | |
7037 | { | |
7038 | expand_goto (dtor_label); | |
7039 | return; | |
7040 | } | |
7041 | ||
7042 | if (DECL_CONSTRUCTOR_P (current_function_decl)) | |
4ac14744 | 7043 | retval = current_class_ptr; |
8d08fdba MS |
7044 | else if (DECL_NAME (result) != NULL_TREE |
7045 | && TREE_CODE (valtype) != VOID_TYPE) | |
7046 | retval = result; | |
7047 | else | |
7048 | { | |
7049 | current_function_returns_null = 1; | |
7050 | ||
7051 | if (valtype != NULL_TREE && TREE_CODE (valtype) != VOID_TYPE) | |
7052 | { | |
7053 | if (DECL_NAME (DECL_RESULT (current_function_decl)) == NULL_TREE) | |
7054 | { | |
7055 | pedwarn ("`return' with no value, in function returning non-void"); | |
7056 | /* Clear this, so finish_function won't say that we | |
7057 | reach the end of a non-void function (which we don't, | |
7058 | we gave a return!). */ | |
7059 | current_function_returns_null = 0; | |
7060 | } | |
7061 | } | |
7062 | ||
7063 | expand_null_return (); | |
7064 | return; | |
7065 | } | |
7066 | } | |
7067 | else if (DECL_CONSTRUCTOR_P (current_function_decl) | |
4ac14744 | 7068 | && retval != current_class_ptr) |
8d08fdba MS |
7069 | { |
7070 | error ("return from a constructor: use `this = ...' instead"); | |
4ac14744 | 7071 | retval = current_class_ptr; |
8d08fdba MS |
7072 | } |
7073 | ||
7074 | if (valtype == NULL_TREE || TREE_CODE (valtype) == VOID_TYPE) | |
7075 | { | |
7076 | current_function_returns_null = 1; | |
7077 | /* We do this here so we'll avoid a warning about how the function | |
7078 | "may or may not return a value" in finish_function. */ | |
7079 | returns_value = 0; | |
7080 | ||
39211cd5 | 7081 | if (retval) |
8d08fdba MS |
7082 | pedwarn ("`return' with a value, in function returning void"); |
7083 | expand_return (retval); | |
7084 | } | |
7085 | /* Add some useful error checking for C++. */ | |
7086 | else if (TREE_CODE (valtype) == REFERENCE_TYPE) | |
7087 | { | |
7088 | tree whats_returned; | |
7089 | tree tmp_result = result; | |
7090 | ||
7091 | /* Don't initialize directly into a non-BLKmode retval, since that | |
7092 | could lose when being inlined by another caller. (GCC can't | |
7093 | read the function return register in an inline function when | |
7094 | the return value is being ignored). */ | |
7095 | if (result && TYPE_MODE (TREE_TYPE (tmp_result)) != BLKmode) | |
7096 | tmp_result = 0; | |
7097 | ||
7098 | /* convert to reference now, so we can give error if we | |
7099 | return an reference to a non-lvalue. */ | |
7100 | retval = convert_for_initialization (tmp_result, valtype, retval, | |
7101 | LOOKUP_NORMAL, "return", | |
7102 | NULL_TREE, 0); | |
7103 | ||
7104 | /* Sort through common things to see what it is | |
7105 | we are returning. */ | |
7106 | whats_returned = retval; | |
7107 | if (TREE_CODE (whats_returned) == COMPOUND_EXPR) | |
7108 | { | |
7109 | whats_returned = TREE_OPERAND (whats_returned, 1); | |
7110 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
7111 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7112 | } | |
7113 | if (TREE_CODE (whats_returned) == ADDR_EXPR) | |
7114 | { | |
7115 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7116 | while (TREE_CODE (whats_returned) == NEW_EXPR | |
2ee887f2 | 7117 | || TREE_CODE (whats_returned) == TARGET_EXPR) |
f376e137 MS |
7118 | { |
7119 | /* Get the target. */ | |
7120 | whats_returned = TREE_OPERAND (whats_returned, 0); | |
7121 | warning ("returning reference to temporary"); | |
7122 | } | |
8d08fdba MS |
7123 | } |
7124 | ||
7125 | if (TREE_CODE (whats_returned) == VAR_DECL && DECL_NAME (whats_returned)) | |
7126 | { | |
7127 | if (TEMP_NAME_P (DECL_NAME (whats_returned))) | |
7128 | warning ("reference to non-lvalue returned"); | |
7129 | else if (! TREE_STATIC (whats_returned) | |
e76a2646 MS |
7130 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) |
7131 | && !TREE_PUBLIC (whats_returned)) | |
8d08fdba MS |
7132 | cp_warning_at ("reference to local variable `%D' returned", whats_returned); |
7133 | } | |
7134 | } | |
7135 | else if (TREE_CODE (retval) == ADDR_EXPR) | |
7136 | { | |
7137 | tree whats_returned = TREE_OPERAND (retval, 0); | |
7138 | ||
8926095f MS |
7139 | if (TREE_CODE (whats_returned) == VAR_DECL |
7140 | && DECL_NAME (whats_returned) | |
8d08fdba | 7141 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (whats_returned)) |
e76a2646 MS |
7142 | && !TREE_STATIC (whats_returned) |
7143 | && !TREE_PUBLIC (whats_returned)) | |
8d08fdba MS |
7144 | cp_warning_at ("address of local variable `%D' returned", whats_returned); |
7145 | } | |
c91a56d2 MS |
7146 | else if (TREE_CODE (retval) == VAR_DECL) |
7147 | { | |
7148 | if (TREE_CODE (TREE_TYPE (retval)) == ARRAY_TYPE | |
7149 | && DECL_NAME (retval) | |
7150 | && IDENTIFIER_LOCAL_VALUE (DECL_NAME (retval)) | |
7151 | && !TREE_STATIC (retval) | |
7152 | && !TREE_PUBLIC (retval)) | |
7153 | cp_warning_at ("address of local array `%D' returned", retval); | |
7154 | } | |
8d08fdba MS |
7155 | |
7156 | /* Now deal with possible C++ hair: | |
7157 | (1) Compute the return value. | |
7158 | (2) If there are aggregate values with destructors which | |
7159 | must be cleaned up, clean them (taking care | |
7160 | not to clobber the return value). | |
7161 | (3) If an X(X&) constructor is defined, the return | |
7162 | value must be returned via that. */ | |
7163 | ||
e8abc66f MS |
7164 | /* If we're returning in a register, we can't initialize the |
7165 | return value from a TARGET_EXPR. */ | |
7166 | if (TREE_CODE (retval) == TARGET_EXPR | |
7167 | && TYPE_MAIN_VARIANT (TREE_TYPE (retval)) == TYPE_MAIN_VARIANT (valtype) | |
7168 | && ! current_function_returns_struct) | |
7169 | retval = expand_target_expr (retval); | |
7170 | ||
8d08fdba MS |
7171 | if (retval == result |
7172 | /* Watch out for constructors, which "return" aggregates | |
7173 | via initialization, but which otherwise "return" a pointer. */ | |
7174 | || DECL_CONSTRUCTOR_P (current_function_decl)) | |
7175 | { | |
7176 | /* This is just an error--it's already been reported. */ | |
7177 | if (TYPE_SIZE (valtype) == NULL_TREE) | |
7178 | return; | |
7179 | ||
7180 | if (TYPE_MODE (valtype) != BLKmode | |
7181 | && any_pending_cleanups (1)) | |
5566b478 | 7182 | retval = get_temp_regvar (valtype, retval); |
8d08fdba | 7183 | } |
e8abc66f | 7184 | else if (IS_AGGR_TYPE (valtype) && current_function_returns_struct) |
8d08fdba | 7185 | { |
6060a796 | 7186 | expand_aggr_init (result, retval, 0, LOOKUP_ONLYCONVERTING); |
a292b002 | 7187 | expand_cleanups_to (NULL_TREE); |
8d08fdba MS |
7188 | DECL_INITIAL (result) = NULL_TREE; |
7189 | retval = 0; | |
7190 | } | |
7191 | else | |
7192 | { | |
7193 | if (TYPE_MODE (valtype) == VOIDmode) | |
7194 | { | |
7195 | if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode | |
7196 | && warn_return_type) | |
7197 | warning ("return of void value in function returning non-void"); | |
7198 | expand_expr_stmt (retval); | |
7199 | retval = 0; | |
7200 | result = 0; | |
7201 | } | |
7202 | else if (TYPE_MODE (valtype) != BLKmode | |
7203 | && any_pending_cleanups (1)) | |
7204 | { | |
7205 | retval = get_temp_regvar (valtype, retval); | |
a292b002 | 7206 | expand_cleanups_to (NULL_TREE); |
8d08fdba MS |
7207 | result = 0; |
7208 | } | |
7209 | else | |
7210 | { | |
e92cc029 MS |
7211 | /* We already did this above, don't do it again. */ |
7212 | if (TREE_CODE (valtype) != REFERENCE_TYPE) | |
7213 | retval = convert_for_initialization (result, valtype, retval, | |
7214 | LOOKUP_NORMAL, | |
7215 | "return", NULL_TREE, 0); | |
8d08fdba MS |
7216 | DECL_INITIAL (result) = NULL_TREE; |
7217 | } | |
7218 | if (retval == error_mark_node) | |
7219 | return; | |
7220 | } | |
7221 | ||
7222 | emit_queue (); | |
7223 | ||
7224 | if (retval != NULL_TREE | |
7225 | && TREE_CODE_CLASS (TREE_CODE (retval)) == 'd' | |
7226 | && cond_stack == 0 && loop_stack == 0 && case_stack == 0) | |
7227 | current_function_return_value = retval; | |
7228 | ||
7229 | if (result) | |
7230 | { | |
7231 | /* Everything's great--RETVAL is in RESULT. */ | |
7232 | if (original_result_rtx) | |
a292b002 MS |
7233 | { |
7234 | store_expr (result, original_result_rtx, 0); | |
7235 | expand_cleanups_to (NULL_TREE); | |
f30432d7 MS |
7236 | use_variable (DECL_RTL (result)); |
7237 | if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) | |
7238 | expand_goto (ctor_label); | |
7239 | else | |
7240 | expand_null_return (); | |
a292b002 | 7241 | } |
8d08fdba MS |
7242 | else if (retval && retval != result) |
7243 | { | |
7244 | /* Clear this out so the later call to decl_function_context | |
7245 | won't end up bombing on us. */ | |
7246 | if (DECL_CONTEXT (result) == error_mark_node) | |
7247 | DECL_CONTEXT (result) = NULL_TREE; | |
7248 | /* Here is where we finally get RETVAL into RESULT. | |
7249 | `expand_return' does the magic of protecting | |
7250 | RESULT from cleanups. */ | |
8ccc31eb MS |
7251 | retval = fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (result), |
7252 | retval)); | |
eac293a1 MS |
7253 | /* This part _must_ come second, because expand_return looks for |
7254 | the INIT_EXPR as the toplevel node only. :-( */ | |
8d08fdba MS |
7255 | retval = build (INIT_EXPR, TREE_TYPE (result), result, retval); |
7256 | TREE_SIDE_EFFECTS (retval) = 1; | |
7257 | expand_return (retval); | |
7258 | } | |
7259 | else | |
7260 | expand_return (result); | |
8d08fdba MS |
7261 | } |
7262 | else | |
7263 | { | |
7264 | /* We may still need to put RETVAL into RESULT. */ | |
7265 | result = DECL_RESULT (current_function_decl); | |
7266 | if (original_result_rtx) | |
7267 | { | |
7268 | /* Here we have a named return value that went | |
7269 | into memory. We can compute RETVAL into that. */ | |
7270 | if (retval) | |
7271 | expand_assignment (result, retval, 0, 0); | |
7272 | else | |
7273 | store_expr (result, original_result_rtx, 0); | |
7274 | result = make_tree (TREE_TYPE (result), original_result_rtx); | |
7275 | } | |
7276 | else if (ctor_label && TREE_CODE (ctor_label) != ERROR_MARK) | |
7277 | { | |
4ac14744 | 7278 | /* Here RETVAL is CURRENT_CLASS_PTR, so there's nothing to do. */ |
8d08fdba MS |
7279 | expand_goto (ctor_label); |
7280 | } | |
7281 | else if (retval) | |
7282 | { | |
7283 | /* Here is where we finally get RETVAL into RESULT. | |
7284 | `expand_return' does the magic of protecting | |
7285 | RESULT from cleanups. */ | |
7286 | result = build (INIT_EXPR, TREE_TYPE (result), result, retval); | |
7287 | TREE_SIDE_EFFECTS (result) = 1; | |
7288 | expand_return (result); | |
7289 | } | |
7290 | else if (TYPE_MODE (TREE_TYPE (result)) != VOIDmode) | |
7291 | expand_return (result); | |
7292 | } | |
7293 | ||
7294 | current_function_returns_value = returns_value; | |
8d08fdba MS |
7295 | |
7296 | /* One way to clear out cleanups that EXPR might | |
7297 | generate. Note that this code will really be | |
7298 | dead code, but that is ok--cleanups that were | |
7299 | needed were handled by the magic of `return'. */ | |
7300 | expand_cleanups_to (NULL_TREE); | |
7301 | } | |
7302 | \f | |
7303 | /* Start a C switch statement, testing expression EXP. | |
7304 | Return EXP if it is valid, an error node otherwise. */ | |
7305 | ||
7306 | tree | |
7307 | c_expand_start_case (exp) | |
7308 | tree exp; | |
7309 | { | |
7310 | tree type; | |
7311 | register enum tree_code code; | |
7312 | ||
7313 | /* Convert from references, etc. */ | |
7314 | exp = default_conversion (exp); | |
7315 | type = TREE_TYPE (exp); | |
7316 | code = TREE_CODE (type); | |
7317 | ||
7318 | if (IS_AGGR_TYPE_CODE (code)) | |
7319 | exp = build_type_conversion (CONVERT_EXPR, integer_type_node, exp, 1); | |
7320 | ||
7321 | if (exp == NULL_TREE) | |
7322 | { | |
7323 | error ("switch quantity not an integer"); | |
7324 | exp = error_mark_node; | |
7325 | } | |
7326 | type = TREE_TYPE (exp); | |
7327 | code = TREE_CODE (type); | |
7328 | ||
7329 | if (code != INTEGER_TYPE && code != ENUMERAL_TYPE && code != ERROR_MARK) | |
7330 | { | |
7331 | error ("switch quantity not an integer"); | |
7332 | exp = error_mark_node; | |
7333 | } | |
7334 | else | |
7335 | { | |
e92cc029 | 7336 | tree idx; |
8d08fdba MS |
7337 | |
7338 | exp = default_conversion (exp); | |
7339 | type = TREE_TYPE (exp); | |
e92cc029 | 7340 | idx = get_unwidened (exp, 0); |
8d08fdba MS |
7341 | /* We can't strip a conversion from a signed type to an unsigned, |
7342 | because if we did, int_fits_type_p would do the wrong thing | |
7343 | when checking case values for being in range, | |
7344 | and it's too hard to do the right thing. */ | |
7345 | if (TREE_UNSIGNED (TREE_TYPE (exp)) | |
e92cc029 MS |
7346 | == TREE_UNSIGNED (TREE_TYPE (idx))) |
7347 | exp = idx; | |
8d08fdba MS |
7348 | } |
7349 | ||
8ccc31eb MS |
7350 | expand_start_case |
7351 | (1, fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (exp), exp)), | |
7352 | type, "switch statement"); | |
8d08fdba MS |
7353 | |
7354 | return exp; | |
7355 | } | |
a0a33927 MS |
7356 | |
7357 | /* CONSTP remembers whether or not all the intervening pointers in the `to' | |
7358 | type have been const. */ | |
e92cc029 | 7359 | |
a0a33927 MS |
7360 | int |
7361 | comp_ptr_ttypes_real (to, from, constp) | |
7362 | tree to, from; | |
7363 | int constp; | |
7364 | { | |
7365 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7366 | { | |
7367 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7368 | return 0; | |
7369 | ||
d11ad92e | 7370 | if (TREE_CODE (from) == OFFSET_TYPE |
c11b6f21 MS |
7371 | && comptypes (TYPE_OFFSET_BASETYPE (from), |
7372 | TYPE_OFFSET_BASETYPE (to), 1)) | |
d11ad92e MS |
7373 | continue; |
7374 | ||
f30432d7 MS |
7375 | /* Const and volatile mean something different for function types, |
7376 | so the usual checks are not appropriate. */ | |
7377 | if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) | |
7378 | { | |
7379 | if (TYPE_READONLY (from) > TYPE_READONLY (to) | |
7380 | || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) | |
7381 | return 0; | |
a0a33927 | 7382 | |
f30432d7 MS |
7383 | if (! constp |
7384 | && (TYPE_READONLY (to) > TYPE_READONLY (from) | |
7385 | || TYPE_VOLATILE (to) > TYPE_READONLY (from))) | |
7386 | return 0; | |
7387 | constp &= TYPE_READONLY (to); | |
7388 | } | |
a0a33927 MS |
7389 | |
7390 | if (TREE_CODE (to) != POINTER_TYPE) | |
7391 | return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); | |
7392 | } | |
7393 | } | |
7394 | ||
7395 | /* When comparing, say, char ** to char const **, this function takes the | |
7396 | 'char *' and 'char const *'. Do not pass non-pointer types to this | |
7397 | function. */ | |
e92cc029 | 7398 | |
a0a33927 MS |
7399 | int |
7400 | comp_ptr_ttypes (to, from) | |
7401 | tree to, from; | |
7402 | { | |
7403 | return comp_ptr_ttypes_real (to, from, 1); | |
7404 | } | |
d11ad92e MS |
7405 | |
7406 | /* Returns 1 if to and from are (possibly multi-level) pointers to the same | |
7407 | type or inheritance-related types, regardless of cv-quals. */ | |
7408 | ||
7409 | int | |
7410 | ptr_reasonably_similar (to, from) | |
7411 | tree to, from; | |
7412 | { | |
7413 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7414 | { | |
7415 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7416 | return 0; | |
7417 | ||
7418 | if (TREE_CODE (from) == OFFSET_TYPE | |
7419 | && comptypes (TYPE_OFFSET_BASETYPE (to), | |
7420 | TYPE_OFFSET_BASETYPE (from), -1)) | |
7421 | continue; | |
7422 | ||
7423 | if (TREE_CODE (to) != POINTER_TYPE) | |
7424 | return comptypes | |
7425 | (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), -1); | |
7426 | } | |
7427 | } | |
c11b6f21 MS |
7428 | |
7429 | /* Like comp_ptr_ttypes, for const_cast. */ | |
7430 | ||
7431 | int | |
7432 | comp_ptr_ttypes_const (to, from) | |
7433 | tree to, from; | |
7434 | { | |
7435 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7436 | { | |
7437 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7438 | return 0; | |
7439 | ||
7440 | if (TREE_CODE (from) == OFFSET_TYPE | |
7441 | && comptypes (TYPE_OFFSET_BASETYPE (from), | |
7442 | TYPE_OFFSET_BASETYPE (to), 1)) | |
7443 | continue; | |
7444 | ||
7445 | if (TREE_CODE (to) != POINTER_TYPE) | |
7446 | return comptypes (TYPE_MAIN_VARIANT (to), TYPE_MAIN_VARIANT (from), 1); | |
7447 | } | |
7448 | } | |
7449 | ||
7450 | /* Like comp_ptr_ttypes, for reinterpret_cast. */ | |
7451 | ||
7452 | int | |
7453 | comp_ptr_ttypes_reinterpret (to, from) | |
7454 | tree to, from; | |
7455 | { | |
7456 | int constp = 1; | |
7457 | ||
7458 | for (; ; to = TREE_TYPE (to), from = TREE_TYPE (from)) | |
7459 | { | |
7460 | if (TREE_CODE (from) == OFFSET_TYPE) | |
7461 | from = TREE_TYPE (from); | |
7462 | if (TREE_CODE (to) == OFFSET_TYPE) | |
7463 | to = TREE_TYPE (to); | |
7464 | ||
7465 | if (TREE_CODE (to) != TREE_CODE (from)) | |
7466 | return 1; | |
7467 | ||
7468 | /* Const and volatile mean something different for function types, | |
7469 | so the usual checks are not appropriate. */ | |
7470 | if (TREE_CODE (to) != FUNCTION_TYPE && TREE_CODE (to) != METHOD_TYPE) | |
7471 | { | |
7472 | if (TYPE_READONLY (from) > TYPE_READONLY (to) | |
7473 | || TYPE_VOLATILE (from) > TYPE_VOLATILE (to)) | |
7474 | return 0; | |
7475 | ||
7476 | if (! constp | |
7477 | && (TYPE_READONLY (to) > TYPE_READONLY (from) | |
7478 | || TYPE_VOLATILE (to) > TYPE_READONLY (from))) | |
7479 | return 0; | |
7480 | constp &= TYPE_READONLY (to); | |
7481 | } | |
7482 | ||
7483 | if (TREE_CODE (to) != POINTER_TYPE) | |
7484 | return 1; | |
7485 | } | |
7486 | } |