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Commit | Line | Data |
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b30f223b | 1 | /* Subroutines shared by all languages that are variants of C. |
1574ef13 | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
d9221e01 | 3 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
b30f223b | 4 | |
1322177d | 5 | This file is part of GCC. |
b30f223b | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
b30f223b | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
b30f223b RS |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
b30f223b RS |
21 | |
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
d9b2742a | 26 | #include "intl.h" |
b30f223b | 27 | #include "tree.h" |
b30f223b | 28 | #include "flags.h" |
d6f4ec51 | 29 | #include "output.h" |
e2af664c | 30 | #include "c-pragma.h" |
3932261a | 31 | #include "rtl.h" |
1526a060 | 32 | #include "ggc.h" |
17211ab5 | 33 | #include "varray.h" |
c6991660 | 34 | #include "expr.h" |
8f17b5c5 | 35 | #include "c-common.h" |
22703ccc | 36 | #include "diagnostic.h" |
7bdb32b9 | 37 | #include "tm_p.h" |
235cfbc4 | 38 | #include "obstack.h" |
c8724862 | 39 | #include "cpplib.h" |
12a68f1f | 40 | #include "target.h" |
7afff7cf | 41 | #include "langhooks.h" |
d57a4b98 | 42 | #include "tree-inline.h" |
0bfa5f65 | 43 | #include "c-tree.h" |
5f1989e6 | 44 | #include "toplev.h" |
6de9cd9a DN |
45 | #include "tree-iterator.h" |
46 | #include "hashtab.h" | |
cb60f38d | 47 | |
81a75f0f | 48 | cpp_reader *parse_in; /* Declared in c-pragma.h. */ |
c8724862 | 49 | |
eaa7c03f JM |
50 | /* We let tm.h override the types used here, to handle trivial differences |
51 | such as the choice of unsigned int or long unsigned int for size_t. | |
52 | When machines start needing nontrivial differences in the size type, | |
53 | it would be best to do something here to figure out automatically | |
54 | from other information what type to use. */ | |
55 | ||
56 | #ifndef SIZE_TYPE | |
57 | #define SIZE_TYPE "long unsigned int" | |
58 | #endif | |
59 | ||
d1c38823 ZD |
60 | #ifndef PID_TYPE |
61 | #define PID_TYPE "int" | |
62 | #endif | |
63 | ||
eaa7c03f JM |
64 | #ifndef WCHAR_TYPE |
65 | #define WCHAR_TYPE "int" | |
66 | #endif | |
67 | ||
a11eba95 ZW |
68 | /* WCHAR_TYPE gets overridden by -fshort-wchar. */ |
69 | #define MODIFIED_WCHAR_TYPE \ | |
70 | (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE) | |
71 | ||
0884b60c BS |
72 | #ifndef PTRDIFF_TYPE |
73 | #define PTRDIFF_TYPE "long int" | |
74 | #endif | |
75 | ||
5fd8e536 JM |
76 | #ifndef WINT_TYPE |
77 | #define WINT_TYPE "unsigned int" | |
78 | #endif | |
79 | ||
80 | #ifndef INTMAX_TYPE | |
81 | #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
82 | ? "int" \ | |
83 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
84 | ? "long int" \ | |
85 | : "long long int")) | |
86 | #endif | |
87 | ||
88 | #ifndef UINTMAX_TYPE | |
89 | #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
90 | ? "unsigned int" \ | |
91 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
92 | ? "long unsigned int" \ | |
93 | : "long long unsigned int")) | |
94 | #endif | |
95 | ||
7f4edbcb | 96 | /* The following symbols are subsumed in the c_global_trees array, and |
d125d268 | 97 | listed here individually for documentation purposes. |
7f4edbcb BS |
98 | |
99 | INTEGER_TYPE and REAL_TYPE nodes for the standard data types. | |
100 | ||
101 | tree short_integer_type_node; | |
102 | tree long_integer_type_node; | |
103 | tree long_long_integer_type_node; | |
104 | ||
105 | tree short_unsigned_type_node; | |
106 | tree long_unsigned_type_node; | |
107 | tree long_long_unsigned_type_node; | |
108 | ||
de7df9eb JM |
109 | tree truthvalue_type_node; |
110 | tree truthvalue_false_node; | |
111 | tree truthvalue_true_node; | |
7f4edbcb BS |
112 | |
113 | tree ptrdiff_type_node; | |
114 | ||
115 | tree unsigned_char_type_node; | |
116 | tree signed_char_type_node; | |
117 | tree wchar_type_node; | |
118 | tree signed_wchar_type_node; | |
119 | tree unsigned_wchar_type_node; | |
120 | ||
121 | tree float_type_node; | |
122 | tree double_type_node; | |
123 | tree long_double_type_node; | |
124 | ||
125 | tree complex_integer_type_node; | |
126 | tree complex_float_type_node; | |
127 | tree complex_double_type_node; | |
128 | tree complex_long_double_type_node; | |
129 | ||
130 | tree intQI_type_node; | |
131 | tree intHI_type_node; | |
132 | tree intSI_type_node; | |
133 | tree intDI_type_node; | |
134 | tree intTI_type_node; | |
135 | ||
136 | tree unsigned_intQI_type_node; | |
137 | tree unsigned_intHI_type_node; | |
138 | tree unsigned_intSI_type_node; | |
139 | tree unsigned_intDI_type_node; | |
140 | tree unsigned_intTI_type_node; | |
141 | ||
142 | tree widest_integer_literal_type_node; | |
143 | tree widest_unsigned_literal_type_node; | |
144 | ||
145 | Nodes for types `void *' and `const void *'. | |
146 | ||
147 | tree ptr_type_node, const_ptr_type_node; | |
148 | ||
149 | Nodes for types `char *' and `const char *'. | |
150 | ||
151 | tree string_type_node, const_string_type_node; | |
152 | ||
153 | Type `char[SOMENUMBER]'. | |
154 | Used when an array of char is needed and the size is irrelevant. | |
155 | ||
156 | tree char_array_type_node; | |
157 | ||
158 | Type `int[SOMENUMBER]' or something like it. | |
159 | Used when an array of int needed and the size is irrelevant. | |
160 | ||
161 | tree int_array_type_node; | |
162 | ||
163 | Type `wchar_t[SOMENUMBER]' or something like it. | |
164 | Used when a wide string literal is created. | |
165 | ||
166 | tree wchar_array_type_node; | |
167 | ||
168 | Type `int ()' -- used for implicit declaration of functions. | |
169 | ||
170 | tree default_function_type; | |
171 | ||
7f4edbcb BS |
172 | A VOID_TYPE node, packaged in a TREE_LIST. |
173 | ||
174 | tree void_list_node; | |
175 | ||
684d9f3b | 176 | The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, |
0ba8a114 NS |
177 | and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ |
178 | VAR_DECLS, but C++ does.) | |
63ad61ed | 179 | |
0ba8a114 | 180 | tree function_name_decl_node; |
684d9f3b | 181 | tree pretty_function_name_decl_node; |
0ba8a114 NS |
182 | tree c99_function_name_decl_node; |
183 | ||
184 | Stack of nested function name VAR_DECLs. | |
35b1a6fa | 185 | |
0ba8a114 | 186 | tree saved_function_name_decls; |
63ad61ed | 187 | |
7f4edbcb BS |
188 | */ |
189 | ||
190 | tree c_global_trees[CTI_MAX]; | |
0b73773c | 191 | |
009ed910 SB |
192 | /* TRUE if a code represents a statement. The front end init |
193 | langhook should take care of initialization of this array. */ | |
194 | ||
195 | bool statement_code_p[MAX_TREE_CODES]; | |
17211ab5 | 196 | \f |
4078b403 NB |
197 | /* Switches common to the C front ends. */ |
198 | ||
aaf93206 | 199 | /* Nonzero if prepreprocessing only. */ |
63973df3 | 200 | |
aaf93206 NB |
201 | int flag_preprocess_only; |
202 | ||
63973df3 NB |
203 | /* Nonzero means don't output line number information. */ |
204 | ||
205 | char flag_no_line_commands; | |
206 | ||
207 | /* Nonzero causes -E output not to be done, but directives such as | |
208 | #define that have side effects are still obeyed. */ | |
209 | ||
210 | char flag_no_output; | |
211 | ||
212 | /* Nonzero means dump macros in some fashion. */ | |
213 | ||
214 | char flag_dump_macros; | |
215 | ||
216 | /* Nonzero means pass #include lines through to the output. */ | |
217 | ||
218 | char flag_dump_includes; | |
219 | ||
17211ab5 GK |
220 | /* The file name to which we should write a precompiled header, or |
221 | NULL if no header will be written in this compile. */ | |
222 | ||
223 | const char *pch_file; | |
224 | ||
3df89291 NB |
225 | /* Nonzero if an ISO standard was selected. It rejects macros in the |
226 | user's namespace. */ | |
227 | int flag_iso; | |
228 | ||
229 | /* Nonzero if -undef was given. It suppresses target built-in macros | |
230 | and assertions. */ | |
231 | int flag_undef; | |
232 | ||
6bcedb4e MM |
233 | /* Nonzero means don't recognize the non-ANSI builtin functions. */ |
234 | ||
235 | int flag_no_builtin; | |
236 | ||
237 | /* Nonzero means don't recognize the non-ANSI builtin functions. | |
238 | -ansi sets this. */ | |
239 | ||
240 | int flag_no_nonansi_builtin; | |
241 | ||
eaa7c03f JM |
242 | /* Nonzero means give `double' the same size as `float'. */ |
243 | ||
244 | int flag_short_double; | |
245 | ||
246 | /* Nonzero means give `wchar_t' the same size as `short'. */ | |
247 | ||
248 | int flag_short_wchar; | |
249 | ||
750491fc RH |
250 | /* Nonzero means allow Microsoft extensions without warnings or errors. */ |
251 | int flag_ms_extensions; | |
252 | ||
4078b403 NB |
253 | /* Nonzero means don't recognize the keyword `asm'. */ |
254 | ||
255 | int flag_no_asm; | |
256 | ||
257 | /* Nonzero means give string constants the type `const char *', as mandated | |
258 | by the standard. */ | |
259 | ||
260 | int flag_const_strings; | |
261 | ||
4078b403 NB |
262 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
263 | ||
264 | int flag_signed_bitfields = 1; | |
265 | int explicit_flag_signed_bitfields; | |
266 | ||
267 | /* Nonzero means warn about pointer casts that can drop a type qualifier | |
268 | from the pointer target type. */ | |
269 | ||
270 | int warn_cast_qual; | |
271 | ||
272 | /* Warn about functions which might be candidates for format attributes. */ | |
273 | ||
274 | int warn_missing_format_attribute; | |
275 | ||
276 | /* Nonzero means warn about sizeof(function) or addition/subtraction | |
277 | of function pointers. */ | |
278 | ||
279 | int warn_pointer_arith; | |
280 | ||
281 | /* Nonzero means warn for any global function def | |
282 | without separate previous prototype decl. */ | |
283 | ||
284 | int warn_missing_prototypes; | |
285 | ||
286 | /* Warn if adding () is suggested. */ | |
287 | ||
288 | int warn_parentheses; | |
289 | ||
290 | /* Warn if initializer is not completely bracketed. */ | |
291 | ||
292 | int warn_missing_braces; | |
293 | ||
294 | /* Warn about comparison of signed and unsigned values. | |
87f85ea0 ZW |
295 | If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified |
296 | (in which case -Wextra gets to decide). */ | |
4078b403 | 297 | |
87f85ea0 | 298 | int warn_sign_compare = -1; |
4078b403 NB |
299 | |
300 | /* Nonzero means warn about usage of long long when `-pedantic'. */ | |
301 | ||
302 | int warn_long_long = 1; | |
303 | ||
304 | /* Nonzero means warn about deprecated conversion from string constant to | |
305 | `char *'. */ | |
306 | ||
307 | int warn_write_strings; | |
308 | ||
309 | /* Nonzero means warn about multiple (redundant) decls for the same single | |
310 | variable or function. */ | |
311 | ||
312 | int warn_redundant_decls; | |
313 | ||
4b7e68e7 | 314 | /* Warn about testing equality of floating point numbers. */ |
4078b403 NB |
315 | |
316 | int warn_float_equal; | |
317 | ||
318 | /* Warn about a subscript that has type char. */ | |
319 | ||
320 | int warn_char_subscripts; | |
321 | ||
322 | /* Warn if a type conversion is done that might have confusing results. */ | |
323 | ||
324 | int warn_conversion; | |
325 | ||
35b1a6fa | 326 | /* Warn about #pragma directives that are not recognized. */ |
4078b403 | 327 | |
35b1a6fa | 328 | int warn_unknown_pragmas; /* Tri state variable. */ |
4078b403 | 329 | |
4078b403 NB |
330 | /* Warn about format/argument anomalies in calls to formatted I/O functions |
331 | (*printf, *scanf, strftime, strfmon, etc.). */ | |
332 | ||
333 | int warn_format; | |
334 | ||
335 | /* Warn about Y2K problems with strftime formats. */ | |
336 | ||
337 | int warn_format_y2k; | |
338 | ||
339 | /* Warn about excess arguments to formats. */ | |
340 | ||
341 | int warn_format_extra_args; | |
342 | ||
343 | /* Warn about zero-length formats. */ | |
344 | ||
345 | int warn_format_zero_length; | |
346 | ||
347 | /* Warn about non-literal format arguments. */ | |
348 | ||
349 | int warn_format_nonliteral; | |
350 | ||
351 | /* Warn about possible security problems with calls to format functions. */ | |
352 | ||
353 | int warn_format_security; | |
354 | ||
264fa2db ZL |
355 | /* Zero means that faster, ...NonNil variants of objc_msgSend... |
356 | calls will be used in ObjC; passing nil receivers to such calls | |
357 | will most likely result in crashes. */ | |
358 | int flag_nil_receivers = 1; | |
359 | ||
360 | /* Nonzero means that we will allow new ObjC exception syntax (@throw, | |
361 | @try, etc.) in source code. */ | |
362 | int flag_objc_exceptions = 0; | |
363 | ||
364 | /* Nonzero means that code generation will be altered to support | |
365 | "zero-link" execution. This currently affects ObjC only, but may | |
366 | affect other languages in the future. */ | |
367 | int flag_zero_link = 0; | |
368 | ||
369 | /* Nonzero means emit an '__OBJC, __image_info' for the current translation | |
370 | unit. It will inform the ObjC runtime that class definition(s) herein | |
371 | contained are to replace one(s) previously loaded. */ | |
372 | int flag_replace_objc_classes = 0; | |
373 | ||
4078b403 NB |
374 | /* C/ObjC language option variables. */ |
375 | ||
376 | ||
377 | /* Nonzero means message about use of implicit function declarations; | |
378 | 1 means warning; 2 means error. */ | |
379 | ||
380 | int mesg_implicit_function_declaration = -1; | |
381 | ||
382 | /* Nonzero means allow type mismatches in conditional expressions; | |
383 | just make their values `void'. */ | |
384 | ||
385 | int flag_cond_mismatch; | |
386 | ||
387 | /* Nonzero means enable C89 Amendment 1 features. */ | |
388 | ||
389 | int flag_isoc94; | |
390 | ||
391 | /* Nonzero means use the ISO C99 dialect of C. */ | |
392 | ||
393 | int flag_isoc99; | |
394 | ||
6614fd40 | 395 | /* Nonzero means that we have builtin functions, and main is an int. */ |
4078b403 NB |
396 | |
397 | int flag_hosted = 1; | |
398 | ||
4078b403 NB |
399 | /* Nonzero means warn when casting a function call to a type that does |
400 | not match the return type (e.g. (float)sqrt() or (anything*)malloc() | |
401 | when there is no previous declaration of sqrt or malloc. */ | |
402 | ||
403 | int warn_bad_function_cast; | |
404 | ||
405 | /* Warn about traditional constructs whose meanings changed in ANSI C. */ | |
406 | ||
407 | int warn_traditional; | |
408 | ||
85617eba HPN |
409 | /* Nonzero means warn for a declaration found after a statement. */ |
410 | ||
411 | int warn_declaration_after_statement; | |
412 | ||
4078b403 NB |
413 | /* Nonzero means warn for non-prototype function decls |
414 | or non-prototyped defs without previous prototype. */ | |
415 | ||
416 | int warn_strict_prototypes; | |
417 | ||
418 | /* Nonzero means warn for any global function def | |
419 | without separate previous decl. */ | |
420 | ||
421 | int warn_missing_declarations; | |
422 | ||
423 | /* Nonzero means warn about declarations of objects not at | |
424 | file-scope level and about *all* declarations of functions (whether | |
425 | or static) not at file-scope level. Note that we exclude | |
426 | implicit function declarations. To get warnings about those, use | |
427 | -Wimplicit. */ | |
428 | ||
429 | int warn_nested_externs; | |
430 | ||
431 | /* Warn if main is suspicious. */ | |
432 | ||
433 | int warn_main; | |
434 | ||
2683ed8d BS |
435 | /* Nonzero means warn about possible violations of sequence point rules. */ |
436 | ||
437 | int warn_sequence_point; | |
438 | ||
02a2edc0 | 439 | /* Nonzero means warn about uninitialized variable when it is initialized with itself. |
59e4e217 | 440 | For example: int i = i;, GCC will not warn about this when warn_init_self is nonzero. */ |
02a2edc0 AP |
441 | |
442 | int warn_init_self; | |
443 | ||
6c36d76b NB |
444 | /* Nonzero means to warn about compile-time division by zero. */ |
445 | int warn_div_by_zero = 1; | |
446 | ||
4078b403 NB |
447 | /* Nonzero means warn about use of implicit int. */ |
448 | ||
449 | int warn_implicit_int; | |
450 | ||
b34c7881 | 451 | /* Warn about NULL being passed to argument slots marked as requiring |
35b1a6fa AJ |
452 | non-NULL. */ |
453 | ||
b34c7881 JT |
454 | int warn_nonnull; |
455 | ||
c034f121 AJ |
456 | /* Warn about old-style parameter declaration. */ |
457 | ||
458 | int warn_old_style_definition; | |
459 | ||
4078b403 NB |
460 | |
461 | /* ObjC language option variables. */ | |
462 | ||
463 | ||
464 | /* Open and close the file for outputting class declarations, if | |
465 | requested (ObjC). */ | |
466 | ||
467 | int flag_gen_declaration; | |
468 | ||
469 | /* Generate code for GNU or NeXT runtime environment. */ | |
470 | ||
471 | #ifdef NEXT_OBJC_RUNTIME | |
472 | int flag_next_runtime = 1; | |
473 | #else | |
474 | int flag_next_runtime = 0; | |
475 | #endif | |
476 | ||
477 | /* Tells the compiler that this is a special run. Do not perform any | |
478 | compiling, instead we are to test some platform dependent features | |
479 | and output a C header file with appropriate definitions. */ | |
480 | ||
481 | int print_struct_values; | |
482 | ||
483 | /* ???. Undocumented. */ | |
484 | ||
485 | const char *constant_string_class_name; | |
486 | ||
487 | /* Warn if multiple methods are seen for the same selector, but with | |
ece4ce85 NP |
488 | different argument types. Performs the check on the whole selector |
489 | table at the end of compilation. */ | |
4078b403 NB |
490 | |
491 | int warn_selector; | |
492 | ||
ece4ce85 NP |
493 | /* Warn if a @selector() is found, and no method with that selector |
494 | has been previously declared. The check is done on each | |
495 | @selector() as soon as it is found - so it warns about forward | |
496 | declarations. */ | |
497 | ||
498 | int warn_undeclared_selector; | |
499 | ||
35b1a6fa | 500 | /* Warn if methods required by a protocol are not implemented in the |
4078b403 NB |
501 | class adopting it. When turned off, methods inherited to that |
502 | class are also considered implemented. */ | |
503 | ||
504 | int warn_protocol = 1; | |
505 | ||
506 | ||
507 | /* C++ language option variables. */ | |
508 | ||
509 | ||
510 | /* Nonzero means don't recognize any extension keywords. */ | |
511 | ||
512 | int flag_no_gnu_keywords; | |
513 | ||
514 | /* Nonzero means do emit exported implementations of functions even if | |
515 | they can be inlined. */ | |
516 | ||
517 | int flag_implement_inlines = 1; | |
518 | ||
4078b403 NB |
519 | /* Nonzero means that implicit instantiations will be emitted if needed. */ |
520 | ||
521 | int flag_implicit_templates = 1; | |
522 | ||
523 | /* Nonzero means that implicit instantiations of inline templates will be | |
524 | emitted if needed, even if instantiations of non-inline templates | |
525 | aren't. */ | |
526 | ||
527 | int flag_implicit_inline_templates = 1; | |
528 | ||
529 | /* Nonzero means generate separate instantiation control files and | |
530 | juggle them at link time. */ | |
531 | ||
532 | int flag_use_repository; | |
533 | ||
534 | /* Nonzero if we want to issue diagnostics that the standard says are not | |
535 | required. */ | |
536 | ||
537 | int flag_optional_diags = 1; | |
538 | ||
539 | /* Nonzero means we should attempt to elide constructors when possible. */ | |
540 | ||
541 | int flag_elide_constructors = 1; | |
542 | ||
543 | /* Nonzero means that member functions defined in class scope are | |
544 | inline by default. */ | |
545 | ||
546 | int flag_default_inline = 1; | |
547 | ||
548 | /* Controls whether compiler generates 'type descriptor' that give | |
549 | run-time type information. */ | |
550 | ||
551 | int flag_rtti = 1; | |
552 | ||
553 | /* Nonzero if we want to conserve space in the .o files. We do this | |
554 | by putting uninitialized data and runtime initialized data into | |
555 | .common instead of .data at the expense of not flagging multiple | |
556 | definitions. */ | |
557 | ||
558 | int flag_conserve_space; | |
559 | ||
560 | /* Nonzero if we want to obey access control semantics. */ | |
561 | ||
562 | int flag_access_control = 1; | |
563 | ||
564 | /* Nonzero if we want to check the return value of new and avoid calling | |
565 | constructors if it is a null pointer. */ | |
566 | ||
567 | int flag_check_new; | |
568 | ||
569 | /* Nonzero if we want the new ISO rules for pushing a new scope for `for' | |
570 | initialization variables. | |
571 | 0: Old rules, set by -fno-for-scope. | |
572 | 2: New ISO rules, set by -ffor-scope. | |
573 | 1: Try to implement new ISO rules, but with backup compatibility | |
574 | (and warnings). This is the default, for now. */ | |
575 | ||
576 | int flag_new_for_scope = 1; | |
577 | ||
578 | /* Nonzero if we want to emit defined symbols with common-like linkage as | |
579 | weak symbols where possible, in order to conform to C++ semantics. | |
580 | Otherwise, emit them as local symbols. */ | |
581 | ||
582 | int flag_weak = 1; | |
583 | ||
b20d9f0c AO |
584 | /* 0 means we want the preprocessor to not emit line directives for |
585 | the current working directory. 1 means we want it to do it. -1 | |
586 | means we should decide depending on whether debugging information | |
587 | is being emitted or not. */ | |
588 | ||
589 | int flag_working_directory = -1; | |
590 | ||
4078b403 NB |
591 | /* Nonzero to use __cxa_atexit, rather than atexit, to register |
592 | destructors for local statics and global objects. */ | |
593 | ||
594 | int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT; | |
595 | ||
4078b403 NB |
596 | /* Nonzero means make the default pedwarns warnings instead of errors. |
597 | The value of this flag is ignored if -pedantic is specified. */ | |
598 | ||
599 | int flag_permissive; | |
600 | ||
601 | /* Nonzero means to implement standard semantics for exception | |
602 | specifications, calling unexpected if an exception is thrown that | |
603 | doesn't match the specification. Zero means to treat them as | |
604 | assertions and optimize accordingly, but not check them. */ | |
605 | ||
606 | int flag_enforce_eh_specs = 1; | |
607 | ||
eca7f13c MM |
608 | /* Nonzero means warn about things that will change when compiling |
609 | with an ABI-compliant compiler. */ | |
610 | ||
611 | int warn_abi = 0; | |
612 | ||
71c0e7fc | 613 | /* Nonzero means warn about invalid uses of offsetof. */ |
35b1a6fa | 614 | |
a01fff59 MA |
615 | int warn_invalid_offsetof = 1; |
616 | ||
4078b403 NB |
617 | /* Nonzero means warn about implicit declarations. */ |
618 | ||
619 | int warn_implicit = 1; | |
620 | ||
621 | /* Nonzero means warn when all ctors or dtors are private, and the class | |
622 | has no friends. */ | |
623 | ||
f333504d | 624 | int warn_ctor_dtor_privacy = 0; |
4078b403 | 625 | |
da7d8304 | 626 | /* Nonzero means warn in function declared in derived class has the |
4078b403 NB |
627 | same name as a virtual in the base class, but fails to match the |
628 | type signature of any virtual function in the base class. */ | |
629 | ||
630 | int warn_overloaded_virtual; | |
631 | ||
da7d8304 | 632 | /* Nonzero means warn when declaring a class that has a non virtual |
4078b403 NB |
633 | destructor, when it really ought to have a virtual one. */ |
634 | ||
635 | int warn_nonvdtor; | |
636 | ||
da7d8304 | 637 | /* Nonzero means warn when the compiler will reorder code. */ |
4078b403 NB |
638 | |
639 | int warn_reorder; | |
640 | ||
da7d8304 | 641 | /* Nonzero means warn when synthesis behavior differs from Cfront's. */ |
4078b403 NB |
642 | |
643 | int warn_synth; | |
644 | ||
da7d8304 | 645 | /* Nonzero means warn when we convert a pointer to member function |
4078b403 NB |
646 | into a pointer to (void or function). */ |
647 | ||
648 | int warn_pmf2ptr = 1; | |
649 | ||
650 | /* Nonzero means warn about violation of some Effective C++ style rules. */ | |
651 | ||
652 | int warn_ecpp; | |
653 | ||
654 | /* Nonzero means warn where overload resolution chooses a promotion from | |
655 | unsigned to signed over a conversion to an unsigned of the same size. */ | |
656 | ||
657 | int warn_sign_promo; | |
658 | ||
659 | /* Nonzero means warn when an old-style cast is used. */ | |
660 | ||
661 | int warn_old_style_cast; | |
662 | ||
663 | /* Nonzero means warn when non-templatized friend functions are | |
664 | declared within a template */ | |
665 | ||
666 | int warn_nontemplate_friend = 1; | |
667 | ||
668 | /* Nonzero means complain about deprecated features. */ | |
669 | ||
670 | int warn_deprecated = 1; | |
671 | ||
672 | /* Maximum template instantiation depth. This limit is rather | |
673 | arbitrary, but it exists to limit the time it takes to notice | |
674 | infinite template instantiations. */ | |
675 | ||
676 | int max_tinst_depth = 500; | |
677 | ||
678 | ||
679 | ||
f09f1de5 MM |
680 | /* The elements of `ridpointers' are identifier nodes for the reserved |
681 | type names and storage classes. It is indexed by a RID_... value. */ | |
682 | tree *ridpointers; | |
683 | ||
35b1a6fa | 684 | tree (*make_fname_decl) (tree, int); |
2ce07e2d | 685 | |
6de9cd9a DN |
686 | /* If non-NULL, the address of a language-specific function that |
687 | returns 1 for language-specific statement codes. */ | |
688 | int (*lang_statement_code_p) (enum tree_code); | |
689 | ||
690 | /* If non-NULL, the address of a language-specific function that does any | |
691 | language-specific gimplification for _STMT nodes and returns 1 iff | |
692 | handled. */ | |
693 | int (*lang_gimplify_stmt) (tree *, tree *); | |
694 | ||
8f17b5c5 MM |
695 | /* If non-NULL, the address of a language-specific function that takes |
696 | any action required right before expand_function_end is called. */ | |
35b1a6fa | 697 | void (*lang_expand_function_end) (void); |
8f17b5c5 | 698 | |
e78a3b42 RK |
699 | /* Nonzero means the expression being parsed will never be evaluated. |
700 | This is a count, since unevaluated expressions can nest. */ | |
701 | int skip_evaluation; | |
702 | ||
ec5c56db | 703 | /* Information about how a function name is generated. */ |
0ba8a114 NS |
704 | struct fname_var_t |
705 | { | |
8b60264b KG |
706 | tree *const decl; /* pointer to the VAR_DECL. */ |
707 | const unsigned rid; /* RID number for the identifier. */ | |
708 | const int pretty; /* How pretty is it? */ | |
0ba8a114 NS |
709 | }; |
710 | ||
ec5c56db | 711 | /* The three ways of getting then name of the current function. */ |
0ba8a114 NS |
712 | |
713 | const struct fname_var_t fname_vars[] = | |
714 | { | |
ec5c56db | 715 | /* C99 compliant __func__, must be first. */ |
0ba8a114 | 716 | {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, |
ec5c56db | 717 | /* GCC __FUNCTION__ compliant. */ |
0ba8a114 | 718 | {&function_name_decl_node, RID_FUNCTION_NAME, 0}, |
ec5c56db | 719 | /* GCC __PRETTY_FUNCTION__ compliant. */ |
0ba8a114 NS |
720 | {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, |
721 | {NULL, 0, 0}, | |
722 | }; | |
723 | ||
35b1a6fa | 724 | static int constant_fits_type_p (tree, tree); |
4724b3de | 725 | |
0a7ed33c BS |
726 | /* Keep a stack of if statements. We record the number of compound |
727 | statements seen up to the if keyword, as well as the line number | |
728 | and file of the if. If a potentially ambiguous else is seen, that | |
729 | fact is recorded; the warning is issued when we can be sure that | |
730 | the enclosing if statement does not have an else branch. */ | |
731 | typedef struct | |
732 | { | |
733 | int compstmt_count; | |
fba020b1 | 734 | location_t locus; |
0a7ed33c | 735 | int needs_warning; |
8f17b5c5 | 736 | tree if_stmt; |
0a7ed33c BS |
737 | } if_elt; |
738 | ||
739 | static if_elt *if_stack; | |
6d819282 MK |
740 | |
741 | /* Amount of space in the if statement stack. */ | |
742 | static int if_stack_space = 0; | |
743 | ||
744 | /* Stack pointer. */ | |
745 | static int if_stack_pointer = 0; | |
746 | ||
35b1a6fa AJ |
747 | static tree handle_packed_attribute (tree *, tree, tree, int, bool *); |
748 | static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
749 | static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
750 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
751 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); | |
752 | static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
753 | bool *); | |
754 | static tree handle_used_attribute (tree *, tree, tree, int, bool *); | |
755 | static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
756 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
757 | static tree handle_transparent_union_attribute (tree *, tree, tree, | |
758 | int, bool *); | |
759 | static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
760 | static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
761 | static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
762 | static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
763 | static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
764 | static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
765 | static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
766 | static tree handle_visibility_attribute (tree *, tree, tree, int, | |
767 | bool *); | |
768 | static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
769 | bool *); | |
770 | static tree handle_no_instrument_function_attribute (tree *, tree, | |
771 | tree, int, bool *); | |
772 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
773 | static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, | |
774 | bool *); | |
775 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
776 | static tree handle_deprecated_attribute (tree *, tree, tree, int, | |
777 | bool *); | |
778 | static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
779 | bool *); | |
780 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
781 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
782 | static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
72954a4f JM |
783 | static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, |
784 | bool *); | |
35b1a6fa AJ |
785 | |
786 | static void check_function_nonnull (tree, tree); | |
787 | static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); | |
788 | static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
789 | static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
d07605f5 | 790 | static int resort_field_decl_cmp (const void *, const void *); |
b34c7881 | 791 | |
349ae713 NB |
792 | /* Table of machine-independent attributes common to all C-like languages. */ |
793 | const struct attribute_spec c_common_attribute_table[] = | |
794 | { | |
795 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
796 | { "packed", 0, 0, false, false, false, | |
35b1a6fa | 797 | handle_packed_attribute }, |
349ae713 NB |
798 | { "nocommon", 0, 0, true, false, false, |
799 | handle_nocommon_attribute }, | |
800 | { "common", 0, 0, true, false, false, | |
801 | handle_common_attribute }, | |
802 | /* FIXME: logically, noreturn attributes should be listed as | |
803 | "false, true, true" and apply to function types. But implementing this | |
804 | would require all the places in the compiler that use TREE_THIS_VOLATILE | |
805 | on a decl to identify non-returning functions to be located and fixed | |
806 | to check the function type instead. */ | |
807 | { "noreturn", 0, 0, true, false, false, | |
808 | handle_noreturn_attribute }, | |
809 | { "volatile", 0, 0, true, false, false, | |
810 | handle_noreturn_attribute }, | |
811 | { "noinline", 0, 0, true, false, false, | |
812 | handle_noinline_attribute }, | |
813 | { "always_inline", 0, 0, true, false, false, | |
814 | handle_always_inline_attribute }, | |
815 | { "used", 0, 0, true, false, false, | |
816 | handle_used_attribute }, | |
817 | { "unused", 0, 0, false, false, false, | |
818 | handle_unused_attribute }, | |
819 | /* The same comments as for noreturn attributes apply to const ones. */ | |
820 | { "const", 0, 0, true, false, false, | |
821 | handle_const_attribute }, | |
822 | { "transparent_union", 0, 0, false, false, false, | |
823 | handle_transparent_union_attribute }, | |
824 | { "constructor", 0, 0, true, false, false, | |
825 | handle_constructor_attribute }, | |
826 | { "destructor", 0, 0, true, false, false, | |
827 | handle_destructor_attribute }, | |
828 | { "mode", 1, 1, false, true, false, | |
829 | handle_mode_attribute }, | |
830 | { "section", 1, 1, true, false, false, | |
831 | handle_section_attribute }, | |
832 | { "aligned", 0, 1, false, false, false, | |
833 | handle_aligned_attribute }, | |
834 | { "weak", 0, 0, true, false, false, | |
835 | handle_weak_attribute }, | |
836 | { "alias", 1, 1, true, false, false, | |
837 | handle_alias_attribute }, | |
838 | { "no_instrument_function", 0, 0, true, false, false, | |
839 | handle_no_instrument_function_attribute }, | |
840 | { "malloc", 0, 0, true, false, false, | |
841 | handle_malloc_attribute }, | |
842 | { "no_stack_limit", 0, 0, true, false, false, | |
843 | handle_no_limit_stack_attribute }, | |
844 | { "pure", 0, 0, true, false, false, | |
845 | handle_pure_attribute }, | |
846 | { "deprecated", 0, 0, false, false, false, | |
847 | handle_deprecated_attribute }, | |
848 | { "vector_size", 1, 1, false, true, false, | |
849 | handle_vector_size_attribute }, | |
850 | { "visibility", 1, 1, true, false, false, | |
851 | handle_visibility_attribute }, | |
dce81a1a JJ |
852 | { "tls_model", 1, 1, true, false, false, |
853 | handle_tls_model_attribute }, | |
b34c7881 JT |
854 | { "nonnull", 0, -1, false, true, true, |
855 | handle_nonnull_attribute }, | |
39f2f3c8 RS |
856 | { "nothrow", 0, 0, true, false, false, |
857 | handle_nothrow_attribute }, | |
d18b1ed8 | 858 | { "may_alias", 0, 0, false, true, false, NULL }, |
0bfa5f65 RH |
859 | { "cleanup", 1, 1, true, false, false, |
860 | handle_cleanup_attribute }, | |
72954a4f JM |
861 | { "warn_unused_result", 0, 0, false, true, true, |
862 | handle_warn_unused_result_attribute }, | |
349ae713 NB |
863 | { NULL, 0, 0, false, false, false, NULL } |
864 | }; | |
865 | ||
866 | /* Give the specifications for the format attributes, used by C and all | |
95bd1dd7 | 867 | descendants. */ |
349ae713 NB |
868 | |
869 | const struct attribute_spec c_common_format_attribute_table[] = | |
870 | { | |
871 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
872 | { "format", 3, 3, false, true, true, | |
873 | handle_format_attribute }, | |
874 | { "format_arg", 1, 1, false, true, true, | |
875 | handle_format_arg_attribute }, | |
876 | { NULL, 0, 0, false, false, false, NULL } | |
877 | }; | |
878 | ||
8f17b5c5 | 879 | /* Record the start of an if-then, and record the start of it |
c1e14513 JL |
880 | for ambiguous else detection. |
881 | ||
882 | COND is the condition for the if-then statement. | |
883 | ||
884 | IF_STMT is the statement node that has already been created for | |
885 | this if-then statement. It is created before parsing the | |
886 | condition to keep line number information accurate. */ | |
0a7ed33c | 887 | |
6d819282 | 888 | void |
35b1a6fa | 889 | c_expand_start_cond (tree cond, int compstmt_count, tree if_stmt) |
6d819282 MK |
890 | { |
891 | /* Make sure there is enough space on the stack. */ | |
892 | if (if_stack_space == 0) | |
893 | { | |
894 | if_stack_space = 10; | |
703ad42b | 895 | if_stack = xmalloc (10 * sizeof (if_elt)); |
6d819282 MK |
896 | } |
897 | else if (if_stack_space == if_stack_pointer) | |
898 | { | |
899 | if_stack_space += 10; | |
703ad42b | 900 | if_stack = xrealloc (if_stack, if_stack_space * sizeof (if_elt)); |
6d819282 | 901 | } |
0a7ed33c | 902 | |
8f17b5c5 MM |
903 | IF_COND (if_stmt) = cond; |
904 | add_stmt (if_stmt); | |
905 | ||
6d819282 | 906 | /* Record this if statement. */ |
0a7ed33c | 907 | if_stack[if_stack_pointer].compstmt_count = compstmt_count; |
070588f0 | 908 | if_stack[if_stack_pointer].locus = input_location; |
0a7ed33c | 909 | if_stack[if_stack_pointer].needs_warning = 0; |
8f17b5c5 | 910 | if_stack[if_stack_pointer].if_stmt = if_stmt; |
0a7ed33c | 911 | if_stack_pointer++; |
8f17b5c5 | 912 | } |
6d819282 | 913 | |
8f17b5c5 MM |
914 | /* Called after the then-clause for an if-statement is processed. */ |
915 | ||
916 | void | |
35b1a6fa | 917 | c_finish_then (void) |
8f17b5c5 MM |
918 | { |
919 | tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt; | |
920 | RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt)); | |
6d819282 MK |
921 | } |
922 | ||
8f17b5c5 | 923 | /* Record the end of an if-then. Optionally warn if a nested |
0a7ed33c BS |
924 | if statement had an ambiguous else clause. */ |
925 | ||
6d819282 | 926 | void |
35b1a6fa | 927 | c_expand_end_cond (void) |
6d819282 MK |
928 | { |
929 | if_stack_pointer--; | |
0a7ed33c | 930 | if (if_stack[if_stack_pointer].needs_warning) |
fba020b1 | 931 | warning ("%Hsuggest explicit braces to avoid ambiguous `else'", |
6de9cd9a | 932 | &if_stack[if_stack_pointer].locus); |
8f17b5c5 | 933 | last_expr_type = NULL_TREE; |
6d819282 MK |
934 | } |
935 | ||
8f17b5c5 | 936 | /* Called between the then-clause and the else-clause |
0a7ed33c BS |
937 | of an if-then-else. */ |
938 | ||
6d819282 | 939 | void |
35b1a6fa | 940 | c_expand_start_else (void) |
6d819282 | 941 | { |
0a7ed33c BS |
942 | /* An ambiguous else warning must be generated for the enclosing if |
943 | statement, unless we see an else branch for that one, too. */ | |
6d819282 MK |
944 | if (warn_parentheses |
945 | && if_stack_pointer > 1 | |
0a7ed33c BS |
946 | && (if_stack[if_stack_pointer - 1].compstmt_count |
947 | == if_stack[if_stack_pointer - 2].compstmt_count)) | |
948 | if_stack[if_stack_pointer - 2].needs_warning = 1; | |
949 | ||
950 | /* Even if a nested if statement had an else branch, it can't be | |
951 | ambiguous if this one also has an else. So don't warn in that | |
952 | case. Also don't warn for any if statements nested in this else. */ | |
953 | if_stack[if_stack_pointer - 1].needs_warning = 0; | |
954 | if_stack[if_stack_pointer - 1].compstmt_count--; | |
8f17b5c5 MM |
955 | } |
956 | ||
957 | /* Called after the else-clause for an if-statement is processed. */ | |
6d819282 | 958 | |
8f17b5c5 | 959 | void |
35b1a6fa | 960 | c_finish_else (void) |
8f17b5c5 MM |
961 | { |
962 | tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt; | |
963 | RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt)); | |
6d819282 MK |
964 | } |
965 | ||
c1e14513 JL |
966 | /* Begin an if-statement. Returns a newly created IF_STMT if |
967 | appropriate. | |
968 | ||
969 | Unlike the C++ front-end, we do not call add_stmt here; it is | |
970 | probably safe to do so, but I am not very familiar with this | |
971 | code so I am being extra careful not to change its behavior | |
972 | beyond what is strictly necessary for correctness. */ | |
973 | ||
974 | tree | |
35b1a6fa | 975 | c_begin_if_stmt (void) |
c1e14513 JL |
976 | { |
977 | tree r; | |
978 | r = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE); | |
979 | return r; | |
980 | } | |
981 | ||
982 | /* Begin a while statement. Returns a newly created WHILE_STMT if | |
983 | appropriate. | |
984 | ||
985 | Unlike the C++ front-end, we do not call add_stmt here; it is | |
986 | probably safe to do so, but I am not very familiar with this | |
987 | code so I am being extra careful not to change its behavior | |
988 | beyond what is strictly necessary for correctness. */ | |
989 | ||
990 | tree | |
35b1a6fa | 991 | c_begin_while_stmt (void) |
c1e14513 JL |
992 | { |
993 | tree r; | |
994 | r = build_stmt (WHILE_STMT, NULL_TREE, NULL_TREE); | |
995 | return r; | |
996 | } | |
997 | ||
998 | void | |
35b1a6fa | 999 | c_finish_while_stmt_cond (tree cond, tree while_stmt) |
c1e14513 JL |
1000 | { |
1001 | WHILE_COND (while_stmt) = cond; | |
1002 | } | |
1003 | ||
ec5c56db | 1004 | /* Push current bindings for the function name VAR_DECLS. */ |
7da551a2 RS |
1005 | |
1006 | void | |
35b1a6fa | 1007 | start_fname_decls (void) |
7da551a2 | 1008 | { |
0ba8a114 NS |
1009 | unsigned ix; |
1010 | tree saved = NULL_TREE; | |
35b1a6fa | 1011 | |
0ba8a114 NS |
1012 | for (ix = 0; fname_vars[ix].decl; ix++) |
1013 | { | |
1014 | tree decl = *fname_vars[ix].decl; | |
7da551a2 | 1015 | |
0ba8a114 NS |
1016 | if (decl) |
1017 | { | |
1018 | saved = tree_cons (decl, build_int_2 (ix, 0), saved); | |
1019 | *fname_vars[ix].decl = NULL_TREE; | |
1020 | } | |
1021 | } | |
1022 | if (saved || saved_function_name_decls) | |
1023 | /* Normally they'll have been NULL, so only push if we've got a | |
1024 | stack, or they are non-NULL. */ | |
1025 | saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
1026 | saved_function_name_decls); | |
1027 | } | |
1028 | ||
1029 | /* Finish up the current bindings, adding them into the | |
1030 | current function's statement tree. This is done by wrapping the | |
1031 | function's body in a COMPOUND_STMT containing these decls too. This | |
1032 | must be done _before_ finish_stmt_tree is called. If there is no | |
1033 | current function, we must be at file scope and no statements are | |
ec5c56db | 1034 | involved. Pop the previous bindings. */ |
0ba8a114 NS |
1035 | |
1036 | void | |
35b1a6fa | 1037 | finish_fname_decls (void) |
0ba8a114 NS |
1038 | { |
1039 | unsigned ix; | |
1040 | tree body = NULL_TREE; | |
1041 | tree stack = saved_function_name_decls; | |
1042 | ||
1043 | for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
1044 | body = chainon (TREE_VALUE (stack), body); | |
35b1a6fa | 1045 | |
0ba8a114 NS |
1046 | if (body) |
1047 | { | |
6cce57b0 JM |
1048 | /* They were called into existence, so add to statement tree. Add |
1049 | the DECL_STMTs inside the outermost scope. */ | |
1050 | tree *p = &DECL_SAVED_TREE (current_function_decl); | |
1051 | /* Skip the dummy EXPR_STMT and any EH_SPEC_BLOCK. */ | |
1052 | while (TREE_CODE (*p) != COMPOUND_STMT) | |
bfaba7a9 AP |
1053 | { |
1054 | if (TREE_CODE (*p) == EXPR_STMT) | |
1055 | p = &TREE_CHAIN (*p); | |
1056 | else | |
1057 | p = &TREE_OPERAND(*p, 0); | |
1058 | } | |
1059 | ||
6cce57b0 JM |
1060 | p = &COMPOUND_BODY (*p); |
1061 | if (TREE_CODE (*p) == SCOPE_STMT) | |
1062 | p = &TREE_CHAIN (*p); | |
1063 | ||
1064 | body = chainon (body, *p); | |
1065 | *p = body; | |
0ba8a114 | 1066 | } |
35b1a6fa | 1067 | |
0ba8a114 NS |
1068 | for (ix = 0; fname_vars[ix].decl; ix++) |
1069 | *fname_vars[ix].decl = NULL_TREE; | |
35b1a6fa | 1070 | |
0ba8a114 | 1071 | if (stack) |
7da551a2 | 1072 | { |
ec5c56db | 1073 | /* We had saved values, restore them. */ |
0ba8a114 NS |
1074 | tree saved; |
1075 | ||
1076 | for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
1077 | { | |
1078 | tree decl = TREE_PURPOSE (saved); | |
1079 | unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
35b1a6fa | 1080 | |
0ba8a114 NS |
1081 | *fname_vars[ix].decl = decl; |
1082 | } | |
1083 | stack = TREE_CHAIN (stack); | |
7da551a2 | 1084 | } |
0ba8a114 NS |
1085 | saved_function_name_decls = stack; |
1086 | } | |
1087 | ||
6cce57b0 | 1088 | /* Return the text name of the current function, suitably prettified |
ec5c56db | 1089 | by PRETTY_P. */ |
0ba8a114 NS |
1090 | |
1091 | const char * | |
35b1a6fa | 1092 | fname_as_string (int pretty_p) |
0ba8a114 | 1093 | { |
47ab33b2 MA |
1094 | const char *name = "top level"; |
1095 | int vrb = 2; | |
1096 | ||
1097 | if (! pretty_p) | |
1098 | { | |
1099 | name = ""; | |
1100 | vrb = 0; | |
1101 | } | |
1102 | ||
1103 | if (current_function_decl) | |
ae2bcd98 | 1104 | name = lang_hooks.decl_printable_name (current_function_decl, vrb); |
47ab33b2 | 1105 | |
0ba8a114 NS |
1106 | return name; |
1107 | } | |
1108 | ||
0ba8a114 NS |
1109 | /* Return the VAR_DECL for a const char array naming the current |
1110 | function. If the VAR_DECL has not yet been created, create it | |
1111 | now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
1112 | ID is its name (unfortunately C and C++ hold the RID values of | |
1113 | keywords in different places, so we can't derive RID from ID in | |
f63d1bf7 | 1114 | this language independent code. */ |
0ba8a114 NS |
1115 | |
1116 | tree | |
35b1a6fa | 1117 | fname_decl (unsigned int rid, tree id) |
0ba8a114 NS |
1118 | { |
1119 | unsigned ix; | |
1120 | tree decl = NULL_TREE; | |
1121 | ||
1122 | for (ix = 0; fname_vars[ix].decl; ix++) | |
1123 | if (fname_vars[ix].rid == rid) | |
1124 | break; | |
1125 | ||
1126 | decl = *fname_vars[ix].decl; | |
1127 | if (!decl) | |
7da551a2 | 1128 | { |
0ba8a114 | 1129 | tree saved_last_tree = last_tree; |
8d3e27d1 DJ |
1130 | /* If a tree is built here, it would normally have the lineno of |
1131 | the current statement. Later this tree will be moved to the | |
1132 | beginning of the function and this line number will be wrong. | |
1133 | To avoid this problem set the lineno to 0 here; that prevents | |
4b7e68e7 | 1134 | it from appearing in the RTL. */ |
d479d37f NS |
1135 | int saved_lineno = input_line; |
1136 | input_line = 0; | |
35b1a6fa | 1137 | |
0ba8a114 NS |
1138 | decl = (*make_fname_decl) (id, fname_vars[ix].pretty); |
1139 | if (last_tree != saved_last_tree) | |
1140 | { | |
1141 | /* We created some statement tree for the decl. This belongs | |
1142 | at the start of the function, so remove it now and reinsert | |
ec5c56db | 1143 | it after the function is complete. */ |
0ba8a114 NS |
1144 | tree stmts = TREE_CHAIN (saved_last_tree); |
1145 | ||
1146 | TREE_CHAIN (saved_last_tree) = NULL_TREE; | |
1147 | last_tree = saved_last_tree; | |
1148 | saved_function_name_decls = tree_cons (decl, stmts, | |
1149 | saved_function_name_decls); | |
1150 | } | |
1151 | *fname_vars[ix].decl = decl; | |
d479d37f | 1152 | input_line = saved_lineno; |
7da551a2 | 1153 | } |
0ba8a114 | 1154 | if (!ix && !current_function_decl) |
ddd2d57e | 1155 | pedwarn ("%J'%D' is not defined outside of function scope", decl, decl); |
6cce57b0 | 1156 | |
0ba8a114 | 1157 | return decl; |
7da551a2 RS |
1158 | } |
1159 | ||
b84a3874 | 1160 | /* Given a STRING_CST, give it a suitable array-of-chars data type. */ |
b30f223b RS |
1161 | |
1162 | tree | |
35b1a6fa | 1163 | fix_string_type (tree value) |
b30f223b | 1164 | { |
b84a3874 RH |
1165 | const int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; |
1166 | const int wide_flag = TREE_TYPE (value) == wchar_array_type_node; | |
1326a48b | 1167 | const int nchars_max = flag_isoc99 ? 4095 : 509; |
b84a3874 RH |
1168 | int length = TREE_STRING_LENGTH (value); |
1169 | int nchars; | |
b30f223b | 1170 | |
b57062ca | 1171 | /* Compute the number of elements, for the array type. */ |
b30f223b RS |
1172 | nchars = wide_flag ? length / wchar_bytes : length; |
1173 | ||
37fa72e9 | 1174 | if (pedantic && nchars - 1 > nchars_max && !c_dialect_cxx ()) |
3220116f | 1175 | pedwarn ("string length `%d' is greater than the length `%d' ISO C%d compilers are required to support", |
690c96c8 | 1176 | nchars - 1, nchars_max, flag_isoc99 ? 99 : 89); |
1326a48b | 1177 | |
b30f223b RS |
1178 | /* Create the array type for the string constant. |
1179 | -Wwrite-strings says make the string constant an array of const char | |
d9cf7c82 JM |
1180 | so that copying it to a non-const pointer will get a warning. |
1181 | For C++, this is the standard behavior. */ | |
3521b33c | 1182 | if (flag_const_strings) |
b30f223b RS |
1183 | { |
1184 | tree elements | |
1185 | = build_type_variant (wide_flag ? wchar_type_node : char_type_node, | |
1186 | 1, 0); | |
1187 | TREE_TYPE (value) | |
1188 | = build_array_type (elements, | |
1189 | build_index_type (build_int_2 (nchars - 1, 0))); | |
1190 | } | |
1191 | else | |
1192 | TREE_TYPE (value) | |
1193 | = build_array_type (wide_flag ? wchar_type_node : char_type_node, | |
1194 | build_index_type (build_int_2 (nchars - 1, 0))); | |
d9cf7c82 | 1195 | |
ccd4c832 | 1196 | TREE_CONSTANT (value) = 1; |
6de9cd9a | 1197 | TREE_INVARIANT (value) = 1; |
3521b33c | 1198 | TREE_READONLY (value) = 1; |
b30f223b RS |
1199 | TREE_STATIC (value) = 1; |
1200 | return value; | |
1201 | } | |
1202 | \f | |
d74154d5 RS |
1203 | /* Print a warning if a constant expression had overflow in folding. |
1204 | Invoke this function on every expression that the language | |
1205 | requires to be a constant expression. | |
1206 | Note the ANSI C standard says it is erroneous for a | |
1207 | constant expression to overflow. */ | |
96571883 BK |
1208 | |
1209 | void | |
35b1a6fa | 1210 | constant_expression_warning (tree value) |
96571883 | 1211 | { |
c05f751c | 1212 | if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST |
69ef87e2 | 1213 | || TREE_CODE (value) == VECTOR_CST |
c05f751c RK |
1214 | || TREE_CODE (value) == COMPLEX_CST) |
1215 | && TREE_CONSTANT_OVERFLOW (value) && pedantic) | |
1216 | pedwarn ("overflow in constant expression"); | |
d74154d5 RS |
1217 | } |
1218 | ||
1219 | /* Print a warning if an expression had overflow in folding. | |
1220 | Invoke this function on every expression that | |
1221 | (1) appears in the source code, and | |
1222 | (2) might be a constant expression that overflowed, and | |
1223 | (3) is not already checked by convert_and_check; | |
1224 | however, do not invoke this function on operands of explicit casts. */ | |
1225 | ||
1226 | void | |
35b1a6fa | 1227 | overflow_warning (tree value) |
d74154d5 | 1228 | { |
c05f751c RK |
1229 | if ((TREE_CODE (value) == INTEGER_CST |
1230 | || (TREE_CODE (value) == COMPLEX_CST | |
1231 | && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST)) | |
1232 | && TREE_OVERFLOW (value)) | |
d74154d5 | 1233 | { |
7193bce2 | 1234 | TREE_OVERFLOW (value) = 0; |
e78a3b42 RK |
1235 | if (skip_evaluation == 0) |
1236 | warning ("integer overflow in expression"); | |
d74154d5 | 1237 | } |
c05f751c RK |
1238 | else if ((TREE_CODE (value) == REAL_CST |
1239 | || (TREE_CODE (value) == COMPLEX_CST | |
1240 | && TREE_CODE (TREE_REALPART (value)) == REAL_CST)) | |
1241 | && TREE_OVERFLOW (value)) | |
1242 | { | |
1243 | TREE_OVERFLOW (value) = 0; | |
e78a3b42 RK |
1244 | if (skip_evaluation == 0) |
1245 | warning ("floating point overflow in expression"); | |
c05f751c | 1246 | } |
69ef87e2 AH |
1247 | else if (TREE_CODE (value) == VECTOR_CST && TREE_OVERFLOW (value)) |
1248 | { | |
1249 | TREE_OVERFLOW (value) = 0; | |
1250 | if (skip_evaluation == 0) | |
1251 | warning ("vector overflow in expression"); | |
1252 | } | |
d74154d5 RS |
1253 | } |
1254 | ||
1255 | /* Print a warning if a large constant is truncated to unsigned, | |
1256 | or if -Wconversion is used and a constant < 0 is converted to unsigned. | |
1257 | Invoke this function on every expression that might be implicitly | |
1258 | converted to an unsigned type. */ | |
1259 | ||
1260 | void | |
35b1a6fa | 1261 | unsigned_conversion_warning (tree result, tree operand) |
d74154d5 | 1262 | { |
ceef8ce4 NB |
1263 | tree type = TREE_TYPE (result); |
1264 | ||
d74154d5 | 1265 | if (TREE_CODE (operand) == INTEGER_CST |
ceef8ce4 | 1266 | && TREE_CODE (type) == INTEGER_TYPE |
8df83eae | 1267 | && TYPE_UNSIGNED (type) |
e78a3b42 | 1268 | && skip_evaluation == 0 |
ceef8ce4 | 1269 | && !int_fits_type_p (operand, type)) |
d74154d5 | 1270 | { |
ceef8ce4 | 1271 | if (!int_fits_type_p (operand, c_common_signed_type (type))) |
d74154d5 | 1272 | /* This detects cases like converting -129 or 256 to unsigned char. */ |
90c939d4 | 1273 | warning ("large integer implicitly truncated to unsigned type"); |
d74154d5 | 1274 | else if (warn_conversion) |
90c939d4 | 1275 | warning ("negative integer implicitly converted to unsigned type"); |
d74154d5 RS |
1276 | } |
1277 | } | |
1278 | ||
d02b54f6 JJ |
1279 | /* Nonzero if constant C has a value that is permissible |
1280 | for type TYPE (an INTEGER_TYPE). */ | |
1281 | ||
1282 | static int | |
35b1a6fa | 1283 | constant_fits_type_p (tree c, tree type) |
d02b54f6 JJ |
1284 | { |
1285 | if (TREE_CODE (c) == INTEGER_CST) | |
1286 | return int_fits_type_p (c, type); | |
1287 | ||
1288 | c = convert (type, c); | |
1289 | return !TREE_OVERFLOW (c); | |
35b1a6fa | 1290 | } |
d02b54f6 | 1291 | |
cc27e657 PB |
1292 | /* Nonzero if vector types T1 and T2 can be converted to each other |
1293 | without an explicit cast. */ | |
1294 | int | |
1295 | vector_types_convertible_p (tree t1, tree t2) | |
1296 | { | |
1297 | return targetm.vector_opaque_p (t1) | |
1298 | || targetm.vector_opaque_p (t2) | |
1299 | || TYPE_MODE (t1) == TYPE_MODE (t2); | |
1300 | } | |
1301 | ||
d74154d5 RS |
1302 | /* Convert EXPR to TYPE, warning about conversion problems with constants. |
1303 | Invoke this function on every expression that is converted implicitly, | |
1304 | i.e. because of language rules and not because of an explicit cast. */ | |
1305 | ||
1306 | tree | |
35b1a6fa | 1307 | convert_and_check (tree type, tree expr) |
d74154d5 RS |
1308 | { |
1309 | tree t = convert (type, expr); | |
1310 | if (TREE_CODE (t) == INTEGER_CST) | |
1311 | { | |
7193bce2 | 1312 | if (TREE_OVERFLOW (t)) |
d74154d5 | 1313 | { |
7193bce2 PE |
1314 | TREE_OVERFLOW (t) = 0; |
1315 | ||
868fc750 RK |
1316 | /* Do not diagnose overflow in a constant expression merely |
1317 | because a conversion overflowed. */ | |
1318 | TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr); | |
1319 | ||
7193bce2 | 1320 | /* No warning for converting 0x80000000 to int. */ |
8df83eae | 1321 | if (!(TYPE_UNSIGNED (type) < TYPE_UNSIGNED (TREE_TYPE (expr)) |
7193bce2 PE |
1322 | && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE |
1323 | && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr)))) | |
22ba338b RS |
1324 | /* If EXPR fits in the unsigned version of TYPE, |
1325 | don't warn unless pedantic. */ | |
e78a3b42 | 1326 | if ((pedantic |
8df83eae | 1327 | || TYPE_UNSIGNED (type) |
ceef8ce4 NB |
1328 | || ! constant_fits_type_p (expr, |
1329 | c_common_unsigned_type (type))) | |
6de9cd9a | 1330 | && skip_evaluation == 0) |
bb72a084 | 1331 | warning ("overflow in implicit constant conversion"); |
d74154d5 RS |
1332 | } |
1333 | else | |
1334 | unsigned_conversion_warning (t, expr); | |
1335 | } | |
1336 | return t; | |
96571883 BK |
1337 | } |
1338 | \f | |
235cfbc4 BS |
1339 | /* A node in a list that describes references to variables (EXPR), which are |
1340 | either read accesses if WRITER is zero, or write accesses, in which case | |
1341 | WRITER is the parent of EXPR. */ | |
1342 | struct tlist | |
1343 | { | |
1344 | struct tlist *next; | |
1345 | tree expr, writer; | |
1346 | }; | |
1347 | ||
1348 | /* Used to implement a cache the results of a call to verify_tree. We only | |
1349 | use this for SAVE_EXPRs. */ | |
1350 | struct tlist_cache | |
1351 | { | |
1352 | struct tlist_cache *next; | |
1353 | struct tlist *cache_before_sp; | |
1354 | struct tlist *cache_after_sp; | |
1355 | tree expr; | |
2683ed8d BS |
1356 | }; |
1357 | ||
235cfbc4 BS |
1358 | /* Obstack to use when allocating tlist structures, and corresponding |
1359 | firstobj. */ | |
1360 | static struct obstack tlist_obstack; | |
1361 | static char *tlist_firstobj = 0; | |
1362 | ||
1363 | /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
1364 | warnings. */ | |
1365 | static struct tlist *warned_ids; | |
1366 | /* SAVE_EXPRs need special treatment. We process them only once and then | |
1367 | cache the results. */ | |
1368 | static struct tlist_cache *save_expr_cache; | |
1369 | ||
35b1a6fa AJ |
1370 | static void add_tlist (struct tlist **, struct tlist *, tree, int); |
1371 | static void merge_tlist (struct tlist **, struct tlist *, int); | |
1372 | static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
1373 | static int warning_candidate_p (tree); | |
1374 | static void warn_for_collisions (struct tlist *); | |
1375 | static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
1376 | static struct tlist *new_tlist (struct tlist *, tree, tree); | |
1377 | static void verify_sequence_points (tree); | |
2683ed8d | 1378 | |
235cfbc4 BS |
1379 | /* Create a new struct tlist and fill in its fields. */ |
1380 | static struct tlist * | |
35b1a6fa | 1381 | new_tlist (struct tlist *next, tree t, tree writer) |
235cfbc4 BS |
1382 | { |
1383 | struct tlist *l; | |
703ad42b | 1384 | l = obstack_alloc (&tlist_obstack, sizeof *l); |
235cfbc4 BS |
1385 | l->next = next; |
1386 | l->expr = t; | |
1387 | l->writer = writer; | |
1388 | return l; | |
1389 | } | |
1390 | ||
1391 | /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
1392 | is nonnull, we ignore any node we find which has a writer equal to it. */ | |
1393 | ||
1394 | static void | |
35b1a6fa | 1395 | add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) |
235cfbc4 BS |
1396 | { |
1397 | while (add) | |
1398 | { | |
1399 | struct tlist *next = add->next; | |
1400 | if (! copy) | |
1401 | add->next = *to; | |
1402 | if (! exclude_writer || add->writer != exclude_writer) | |
1403 | *to = copy ? new_tlist (*to, add->expr, add->writer) : add; | |
1404 | add = next; | |
1405 | } | |
1406 | } | |
1407 | ||
1408 | /* Merge the nodes of ADD into TO. This merging process is done so that for | |
1409 | each variable that already exists in TO, no new node is added; however if | |
1410 | there is a write access recorded in ADD, and an occurrence on TO is only | |
1411 | a read access, then the occurrence in TO will be modified to record the | |
1412 | write. */ | |
2683ed8d BS |
1413 | |
1414 | static void | |
35b1a6fa | 1415 | merge_tlist (struct tlist **to, struct tlist *add, int copy) |
235cfbc4 BS |
1416 | { |
1417 | struct tlist **end = to; | |
1418 | ||
1419 | while (*end) | |
1420 | end = &(*end)->next; | |
1421 | ||
1422 | while (add) | |
1423 | { | |
1424 | int found = 0; | |
1425 | struct tlist *tmp2; | |
1426 | struct tlist *next = add->next; | |
1427 | ||
1428 | for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
1429 | if (tmp2->expr == add->expr) | |
1430 | { | |
1431 | found = 1; | |
1432 | if (! tmp2->writer) | |
1433 | tmp2->writer = add->writer; | |
1434 | } | |
1435 | if (! found) | |
1436 | { | |
1437 | *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
1438 | end = &(*end)->next; | |
1439 | *end = 0; | |
1440 | } | |
1441 | add = next; | |
1442 | } | |
1443 | } | |
1444 | ||
1445 | /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
1446 | references in list LIST conflict with it, excluding reads if ONLY writers | |
1447 | is nonzero. */ | |
1448 | ||
1449 | static void | |
35b1a6fa AJ |
1450 | warn_for_collisions_1 (tree written, tree writer, struct tlist *list, |
1451 | int only_writes) | |
235cfbc4 BS |
1452 | { |
1453 | struct tlist *tmp; | |
1454 | ||
1455 | /* Avoid duplicate warnings. */ | |
1456 | for (tmp = warned_ids; tmp; tmp = tmp->next) | |
1457 | if (tmp->expr == written) | |
1458 | return; | |
1459 | ||
1460 | while (list) | |
1461 | { | |
1462 | if (list->expr == written | |
1463 | && list->writer != writer | |
1464 | && (! only_writes || list->writer)) | |
1465 | { | |
1466 | warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
1467 | warning ("operation on `%s' may be undefined", | |
1468 | IDENTIFIER_POINTER (DECL_NAME (list->expr))); | |
1469 | } | |
1470 | list = list->next; | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | /* Given a list LIST of references to variables, find whether any of these | |
1475 | can cause conflicts due to missing sequence points. */ | |
1476 | ||
1477 | static void | |
35b1a6fa | 1478 | warn_for_collisions (struct tlist *list) |
235cfbc4 BS |
1479 | { |
1480 | struct tlist *tmp; | |
35b1a6fa | 1481 | |
235cfbc4 BS |
1482 | for (tmp = list; tmp; tmp = tmp->next) |
1483 | { | |
1484 | if (tmp->writer) | |
1485 | warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
1486 | } | |
1487 | } | |
1488 | ||
684d9f3b | 1489 | /* Return nonzero if X is a tree that can be verified by the sequence point |
235cfbc4 BS |
1490 | warnings. */ |
1491 | static int | |
35b1a6fa | 1492 | warning_candidate_p (tree x) |
2683ed8d | 1493 | { |
235cfbc4 BS |
1494 | return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL; |
1495 | } | |
2683ed8d | 1496 | |
235cfbc4 BS |
1497 | /* Walk the tree X, and record accesses to variables. If X is written by the |
1498 | parent tree, WRITER is the parent. | |
1499 | We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
1500 | expression or its only operand forces a sequence point, then everything up | |
1501 | to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
1502 | in PNO_SP. | |
1503 | Once we return, we will have emitted warnings if any subexpression before | |
1504 | such a sequence point could be undefined. On a higher level, however, the | |
1505 | sequence point may not be relevant, and we'll merge the two lists. | |
1506 | ||
1507 | Example: (b++, a) + b; | |
1508 | The call that processes the COMPOUND_EXPR will store the increment of B | |
1509 | in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
1510 | processes the PLUS_EXPR will need to merge the two lists so that | |
1511 | eventually, all accesses end up on the same list (and we'll warn about the | |
1512 | unordered subexpressions b++ and b. | |
1513 | ||
1514 | A note on merging. If we modify the former example so that our expression | |
1515 | becomes | |
1516 | (b++, b) + a | |
1517 | care must be taken not simply to add all three expressions into the final | |
1518 | PNO_SP list. The function merge_tlist takes care of that by merging the | |
1519 | before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
1520 | way, so that no more than one access to B is recorded. */ | |
2683ed8d | 1521 | |
235cfbc4 | 1522 | static void |
35b1a6fa AJ |
1523 | verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, |
1524 | tree writer) | |
235cfbc4 BS |
1525 | { |
1526 | struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
1527 | enum tree_code code; | |
1528 | char class; | |
2683ed8d | 1529 | |
f9e1917e JM |
1530 | /* X may be NULL if it is the operand of an empty statement expression |
1531 | ({ }). */ | |
1532 | if (x == NULL) | |
1533 | return; | |
1534 | ||
235cfbc4 BS |
1535 | restart: |
1536 | code = TREE_CODE (x); | |
1537 | class = TREE_CODE_CLASS (code); | |
2683ed8d | 1538 | |
235cfbc4 | 1539 | if (warning_candidate_p (x)) |
2683ed8d | 1540 | { |
235cfbc4 BS |
1541 | *pno_sp = new_tlist (*pno_sp, x, writer); |
1542 | return; | |
1543 | } | |
1544 | ||
1545 | switch (code) | |
1546 | { | |
52a84e42 BS |
1547 | case CONSTRUCTOR: |
1548 | return; | |
1549 | ||
235cfbc4 BS |
1550 | case COMPOUND_EXPR: |
1551 | case TRUTH_ANDIF_EXPR: | |
1552 | case TRUTH_ORIF_EXPR: | |
1553 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1554 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1555 | warn_for_collisions (tmp_nosp); | |
1556 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1557 | merge_tlist (pbefore_sp, tmp_nosp, 0); | |
1558 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
1559 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1560 | return; | |
1561 | ||
1562 | case COND_EXPR: | |
1563 | tmp_before = tmp_list2 = 0; | |
1564 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
1565 | warn_for_collisions (tmp_list2); | |
1566 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1567 | merge_tlist (pbefore_sp, tmp_list2, 1); | |
1568 | ||
1569 | tmp_list3 = tmp_nosp = 0; | |
1570 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
1571 | warn_for_collisions (tmp_nosp); | |
1572 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1573 | ||
1574 | tmp_list3 = tmp_list2 = 0; | |
1575 | verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
1576 | warn_for_collisions (tmp_list2); | |
1577 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1578 | /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
1579 | two first, to avoid warning for (a ? b++ : b++). */ | |
1580 | merge_tlist (&tmp_nosp, tmp_list2, 0); | |
1581 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1582 | return; | |
1583 | ||
2683ed8d BS |
1584 | case PREDECREMENT_EXPR: |
1585 | case PREINCREMENT_EXPR: | |
1586 | case POSTDECREMENT_EXPR: | |
1587 | case POSTINCREMENT_EXPR: | |
235cfbc4 BS |
1588 | verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); |
1589 | return; | |
1590 | ||
1591 | case MODIFY_EXPR: | |
1592 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1593 | verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
1594 | verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
1595 | /* Expressions inside the LHS are not ordered wrt. the sequence points | |
1596 | in the RHS. Example: | |
1597 | *a = (a++, 2) | |
1598 | Despite the fact that the modification of "a" is in the before_sp | |
1599 | list (tmp_before), it conflicts with the use of "a" in the LHS. | |
1600 | We can handle this by adding the contents of tmp_list3 | |
1601 | to those of tmp_before, and redoing the collision warnings for that | |
1602 | list. */ | |
1603 | add_tlist (&tmp_before, tmp_list3, x, 1); | |
1604 | warn_for_collisions (tmp_before); | |
1605 | /* Exclude the LHS itself here; we first have to merge it into the | |
1606 | tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
1607 | didn't exclude the LHS, we'd get it twice, once as a read and once | |
1608 | as a write. */ | |
1609 | add_tlist (pno_sp, tmp_list3, x, 0); | |
1610 | warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
1611 | ||
1612 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1613 | if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
1614 | merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
1615 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
1616 | return; | |
2683ed8d BS |
1617 | |
1618 | case CALL_EXPR: | |
235cfbc4 BS |
1619 | /* We need to warn about conflicts among arguments and conflicts between |
1620 | args and the function address. Side effects of the function address, | |
1621 | however, are not ordered by the sequence point of the call. */ | |
1622 | tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0; | |
1623 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1624 | if (TREE_OPERAND (x, 1)) | |
1625 | verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE); | |
1626 | merge_tlist (&tmp_list3, tmp_list2, 0); | |
1627 | add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
1628 | add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
1629 | warn_for_collisions (tmp_before); | |
1630 | add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
1631 | return; | |
2683ed8d BS |
1632 | |
1633 | case TREE_LIST: | |
1634 | /* Scan all the list, e.g. indices of multi dimensional array. */ | |
1635 | while (x) | |
1636 | { | |
235cfbc4 BS |
1637 | tmp_before = tmp_nosp = 0; |
1638 | verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
1639 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1640 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2683ed8d BS |
1641 | x = TREE_CHAIN (x); |
1642 | } | |
235cfbc4 | 1643 | return; |
2683ed8d | 1644 | |
235cfbc4 BS |
1645 | case SAVE_EXPR: |
1646 | { | |
1647 | struct tlist_cache *t; | |
1648 | for (t = save_expr_cache; t; t = t->next) | |
1649 | if (t->expr == x) | |
1650 | break; | |
2683ed8d | 1651 | |
235cfbc4 | 1652 | if (! t) |
2683ed8d | 1653 | { |
703ad42b | 1654 | t = obstack_alloc (&tlist_obstack, sizeof *t); |
235cfbc4 BS |
1655 | t->next = save_expr_cache; |
1656 | t->expr = x; | |
1657 | save_expr_cache = t; | |
1658 | ||
1659 | tmp_before = tmp_nosp = 0; | |
1660 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1661 | warn_for_collisions (tmp_nosp); | |
1662 | ||
1663 | tmp_list3 = 0; | |
1664 | while (tmp_nosp) | |
1665 | { | |
1666 | struct tlist *t = tmp_nosp; | |
1667 | tmp_nosp = t->next; | |
1668 | merge_tlist (&tmp_list3, t, 0); | |
1669 | } | |
1670 | t->cache_before_sp = tmp_before; | |
1671 | t->cache_after_sp = tmp_list3; | |
2683ed8d | 1672 | } |
235cfbc4 BS |
1673 | merge_tlist (pbefore_sp, t->cache_before_sp, 1); |
1674 | add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
1675 | return; | |
1676 | } | |
1677 | default: | |
2683ed8d BS |
1678 | break; |
1679 | } | |
2683ed8d | 1680 | |
235cfbc4 | 1681 | if (class == '1') |
2683ed8d | 1682 | { |
235cfbc4 BS |
1683 | if (first_rtl_op (code) == 0) |
1684 | return; | |
1685 | x = TREE_OPERAND (x, 0); | |
1686 | writer = 0; | |
1687 | goto restart; | |
2683ed8d BS |
1688 | } |
1689 | ||
235cfbc4 | 1690 | switch (class) |
2683ed8d | 1691 | { |
235cfbc4 BS |
1692 | case 'r': |
1693 | case '<': | |
1694 | case '2': | |
1695 | case 'b': | |
1696 | case 'e': | |
1697 | case 's': | |
1698 | case 'x': | |
1699 | { | |
1700 | int lp; | |
1701 | int max = first_rtl_op (TREE_CODE (x)); | |
1702 | for (lp = 0; lp < max; lp++) | |
1703 | { | |
1704 | tmp_before = tmp_nosp = 0; | |
1705 | verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, NULL_TREE); | |
1706 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1707 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1708 | } | |
1709 | break; | |
1710 | } | |
2683ed8d | 1711 | } |
2683ed8d BS |
1712 | } |
1713 | ||
8d9afc4e | 1714 | /* Try to warn for undefined behavior in EXPR due to missing sequence |
2683ed8d BS |
1715 | points. */ |
1716 | ||
1717 | static void | |
35b1a6fa | 1718 | verify_sequence_points (tree expr) |
2683ed8d | 1719 | { |
235cfbc4 | 1720 | struct tlist *before_sp = 0, *after_sp = 0; |
2683ed8d | 1721 | |
235cfbc4 BS |
1722 | warned_ids = 0; |
1723 | save_expr_cache = 0; | |
1724 | if (tlist_firstobj == 0) | |
2683ed8d | 1725 | { |
235cfbc4 BS |
1726 | gcc_obstack_init (&tlist_obstack); |
1727 | tlist_firstobj = obstack_alloc (&tlist_obstack, 0); | |
2683ed8d BS |
1728 | } |
1729 | ||
235cfbc4 BS |
1730 | verify_tree (expr, &before_sp, &after_sp, 0); |
1731 | warn_for_collisions (after_sp); | |
1732 | obstack_free (&tlist_obstack, tlist_firstobj); | |
2683ed8d BS |
1733 | } |
1734 | ||
64094f6a | 1735 | tree |
35b1a6fa | 1736 | c_expand_expr_stmt (tree expr) |
b30f223b RS |
1737 | { |
1738 | /* Do default conversion if safe and possibly important, | |
1739 | in case within ({...}). */ | |
207bf485 JM |
1740 | if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE |
1741 | && (flag_isoc99 || lvalue_p (expr))) | |
b30f223b RS |
1742 | || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE) |
1743 | expr = default_conversion (expr); | |
1744 | ||
2683ed8d BS |
1745 | if (warn_sequence_point) |
1746 | verify_sequence_points (expr); | |
1747 | ||
b30f223b | 1748 | if (TREE_TYPE (expr) != error_mark_node |
b8de2d02 | 1749 | && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr)) |
b30f223b RS |
1750 | && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE) |
1751 | error ("expression statement has incomplete type"); | |
1752 | ||
35b1a6fa | 1753 | last_expr_type = TREE_TYPE (expr); |
64094f6a | 1754 | return add_stmt (build_stmt (EXPR_STMT, expr)); |
b30f223b RS |
1755 | } |
1756 | \f | |
1757 | /* Validate the expression after `case' and apply default promotions. */ | |
1758 | ||
1759 | tree | |
35b1a6fa | 1760 | check_case_value (tree value) |
b30f223b RS |
1761 | { |
1762 | if (value == NULL_TREE) | |
1763 | return value; | |
1764 | ||
1765 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
8493738b | 1766 | STRIP_TYPE_NOPS (value); |
56cb9733 MM |
1767 | /* In C++, the following is allowed: |
1768 | ||
1769 | const int i = 3; | |
1770 | switch (...) { case i: ... } | |
1771 | ||
1772 | So, we try to reduce the VALUE to a constant that way. */ | |
37fa72e9 | 1773 | if (c_dialect_cxx ()) |
56cb9733 MM |
1774 | { |
1775 | value = decl_constant_value (value); | |
1776 | STRIP_TYPE_NOPS (value); | |
1777 | value = fold (value); | |
1778 | } | |
b30f223b RS |
1779 | |
1780 | if (TREE_CODE (value) != INTEGER_CST | |
1781 | && value != error_mark_node) | |
1782 | { | |
1783 | error ("case label does not reduce to an integer constant"); | |
1784 | value = error_mark_node; | |
1785 | } | |
1786 | else | |
1787 | /* Promote char or short to int. */ | |
1788 | value = default_conversion (value); | |
1789 | ||
bc690db1 RS |
1790 | constant_expression_warning (value); |
1791 | ||
b30f223b RS |
1792 | return value; |
1793 | } | |
1794 | \f | |
1795 | /* Return an integer type with BITS bits of precision, | |
1796 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
1797 | ||
1798 | tree | |
35b1a6fa | 1799 | c_common_type_for_size (unsigned int bits, int unsignedp) |
b30f223b | 1800 | { |
a311b52c JM |
1801 | if (bits == TYPE_PRECISION (integer_type_node)) |
1802 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1803 | ||
3fc7e390 | 1804 | if (bits == TYPE_PRECISION (signed_char_type_node)) |
b30f223b RS |
1805 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
1806 | ||
3fc7e390 | 1807 | if (bits == TYPE_PRECISION (short_integer_type_node)) |
b30f223b RS |
1808 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
1809 | ||
3fc7e390 | 1810 | if (bits == TYPE_PRECISION (long_integer_type_node)) |
b30f223b RS |
1811 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
1812 | ||
3fc7e390 | 1813 | if (bits == TYPE_PRECISION (long_long_integer_type_node)) |
b30f223b RS |
1814 | return (unsignedp ? long_long_unsigned_type_node |
1815 | : long_long_integer_type_node); | |
1816 | ||
835f9b4d GRK |
1817 | if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) |
1818 | return (unsignedp ? widest_unsigned_literal_type_node | |
1819 | : widest_integer_literal_type_node); | |
1820 | ||
3fc7e390 RS |
1821 | if (bits <= TYPE_PRECISION (intQI_type_node)) |
1822 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
1823 | ||
1824 | if (bits <= TYPE_PRECISION (intHI_type_node)) | |
1825 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
1826 | ||
1827 | if (bits <= TYPE_PRECISION (intSI_type_node)) | |
1828 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
1829 | ||
1830 | if (bits <= TYPE_PRECISION (intDI_type_node)) | |
1831 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
1832 | ||
b30f223b RS |
1833 | return 0; |
1834 | } | |
1835 | ||
d1d3865f ZW |
1836 | /* Used for communication between c_common_type_for_mode and |
1837 | c_register_builtin_type. */ | |
1838 | static GTY(()) tree registered_builtin_types; | |
1839 | ||
b30f223b RS |
1840 | /* Return a data type that has machine mode MODE. |
1841 | If the mode is an integer, | |
1842 | then UNSIGNEDP selects between signed and unsigned types. */ | |
1843 | ||
1844 | tree | |
35b1a6fa | 1845 | c_common_type_for_mode (enum machine_mode mode, int unsignedp) |
b30f223b | 1846 | { |
d1d3865f ZW |
1847 | tree t; |
1848 | ||
a311b52c JM |
1849 | if (mode == TYPE_MODE (integer_type_node)) |
1850 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1851 | ||
b30f223b RS |
1852 | if (mode == TYPE_MODE (signed_char_type_node)) |
1853 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1854 | ||
1855 | if (mode == TYPE_MODE (short_integer_type_node)) | |
1856 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1857 | ||
b30f223b RS |
1858 | if (mode == TYPE_MODE (long_integer_type_node)) |
1859 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1860 | ||
1861 | if (mode == TYPE_MODE (long_long_integer_type_node)) | |
1862 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
1863 | ||
835f9b4d | 1864 | if (mode == TYPE_MODE (widest_integer_literal_type_node)) |
d125d268 | 1865 | return unsignedp ? widest_unsigned_literal_type_node |
6de9cd9a | 1866 | : widest_integer_literal_type_node; |
835f9b4d | 1867 | |
0afeef64 | 1868 | if (mode == QImode) |
3fc7e390 RS |
1869 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
1870 | ||
0afeef64 | 1871 | if (mode == HImode) |
3fc7e390 RS |
1872 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
1873 | ||
0afeef64 | 1874 | if (mode == SImode) |
3fc7e390 RS |
1875 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
1876 | ||
0afeef64 | 1877 | if (mode == DImode) |
3fc7e390 RS |
1878 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
1879 | ||
21a9616b | 1880 | #if HOST_BITS_PER_WIDE_INT >= 64 |
a6d7e156 JL |
1881 | if (mode == TYPE_MODE (intTI_type_node)) |
1882 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
21a9616b | 1883 | #endif |
a6d7e156 | 1884 | |
b30f223b RS |
1885 | if (mode == TYPE_MODE (float_type_node)) |
1886 | return float_type_node; | |
1887 | ||
1888 | if (mode == TYPE_MODE (double_type_node)) | |
1889 | return double_type_node; | |
1890 | ||
1891 | if (mode == TYPE_MODE (long_double_type_node)) | |
1892 | return long_double_type_node; | |
1893 | ||
ff42324e NS |
1894 | if (mode == TYPE_MODE (void_type_node)) |
1895 | return void_type_node; | |
1896 | ||
b30f223b | 1897 | if (mode == TYPE_MODE (build_pointer_type (char_type_node))) |
fb5d2a87 | 1898 | return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode); |
b30f223b RS |
1899 | |
1900 | if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
fb5d2a87 | 1901 | return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode); |
b30f223b | 1902 | |
4a5eab38 PB |
1903 | if (VECTOR_MODE_P (mode)) |
1904 | { | |
1905 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
1906 | tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1907 | if (inner_type != NULL_TREE) | |
1908 | return build_vector_type_for_mode (inner_type, mode); | |
0afeef64 | 1909 | } |
4061f623 | 1910 | |
d1d3865f ZW |
1911 | for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
1912 | if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
1913 | return TREE_VALUE (t); | |
1914 | ||
b30f223b RS |
1915 | return 0; |
1916 | } | |
693a6128 | 1917 | |
ec5c56db | 1918 | /* Return an unsigned type the same as TYPE in other respects. */ |
693a6128 | 1919 | tree |
35b1a6fa | 1920 | c_common_unsigned_type (tree type) |
693a6128 GRK |
1921 | { |
1922 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1923 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1924 | return unsigned_char_type_node; | |
1925 | if (type1 == integer_type_node) | |
1926 | return unsigned_type_node; | |
1927 | if (type1 == short_integer_type_node) | |
1928 | return short_unsigned_type_node; | |
1929 | if (type1 == long_integer_type_node) | |
1930 | return long_unsigned_type_node; | |
1931 | if (type1 == long_long_integer_type_node) | |
1932 | return long_long_unsigned_type_node; | |
1933 | if (type1 == widest_integer_literal_type_node) | |
1934 | return widest_unsigned_literal_type_node; | |
1935 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1936 | if (type1 == intTI_type_node) | |
1937 | return unsigned_intTI_type_node; | |
1938 | #endif | |
1939 | if (type1 == intDI_type_node) | |
1940 | return unsigned_intDI_type_node; | |
1941 | if (type1 == intSI_type_node) | |
1942 | return unsigned_intSI_type_node; | |
1943 | if (type1 == intHI_type_node) | |
1944 | return unsigned_intHI_type_node; | |
1945 | if (type1 == intQI_type_node) | |
1946 | return unsigned_intQI_type_node; | |
1947 | ||
ceef8ce4 | 1948 | return c_common_signed_or_unsigned_type (1, type); |
693a6128 GRK |
1949 | } |
1950 | ||
1951 | /* Return a signed type the same as TYPE in other respects. */ | |
1952 | ||
1953 | tree | |
35b1a6fa | 1954 | c_common_signed_type (tree type) |
693a6128 GRK |
1955 | { |
1956 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1957 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1958 | return signed_char_type_node; | |
1959 | if (type1 == unsigned_type_node) | |
1960 | return integer_type_node; | |
1961 | if (type1 == short_unsigned_type_node) | |
1962 | return short_integer_type_node; | |
1963 | if (type1 == long_unsigned_type_node) | |
1964 | return long_integer_type_node; | |
1965 | if (type1 == long_long_unsigned_type_node) | |
1966 | return long_long_integer_type_node; | |
1967 | if (type1 == widest_unsigned_literal_type_node) | |
1968 | return widest_integer_literal_type_node; | |
1969 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1970 | if (type1 == unsigned_intTI_type_node) | |
1971 | return intTI_type_node; | |
1972 | #endif | |
1973 | if (type1 == unsigned_intDI_type_node) | |
1974 | return intDI_type_node; | |
1975 | if (type1 == unsigned_intSI_type_node) | |
1976 | return intSI_type_node; | |
1977 | if (type1 == unsigned_intHI_type_node) | |
1978 | return intHI_type_node; | |
1979 | if (type1 == unsigned_intQI_type_node) | |
1980 | return intQI_type_node; | |
1981 | ||
ceef8ce4 | 1982 | return c_common_signed_or_unsigned_type (0, type); |
693a6128 GRK |
1983 | } |
1984 | ||
1985 | /* Return a type the same as TYPE except unsigned or | |
1986 | signed according to UNSIGNEDP. */ | |
1987 | ||
1988 | tree | |
35b1a6fa | 1989 | c_common_signed_or_unsigned_type (int unsignedp, tree type) |
693a6128 GRK |
1990 | { |
1991 | if (! INTEGRAL_TYPE_P (type) | |
8df83eae | 1992 | || TYPE_UNSIGNED (type) == unsignedp) |
693a6128 GRK |
1993 | return type; |
1994 | ||
3504b199 RH |
1995 | /* Must check the mode of the types, not the precision. Enumeral types |
1996 | in C++ have precision set to match their range, but may use a wider | |
1997 | mode to match an ABI. If we change modes, we may wind up with bad | |
1998 | conversions. */ | |
1999 | ||
2000 | if (TYPE_MODE (type) == TYPE_MODE (signed_char_type_node)) | |
693a6128 | 2001 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
3504b199 | 2002 | if (TYPE_MODE (type) == TYPE_MODE (integer_type_node)) |
693a6128 | 2003 | return unsignedp ? unsigned_type_node : integer_type_node; |
3504b199 | 2004 | if (TYPE_MODE (type) == TYPE_MODE (short_integer_type_node)) |
693a6128 | 2005 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
3504b199 | 2006 | if (TYPE_MODE (type) == TYPE_MODE (long_integer_type_node)) |
693a6128 | 2007 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
3504b199 | 2008 | if (TYPE_MODE (type) == TYPE_MODE (long_long_integer_type_node)) |
693a6128 GRK |
2009 | return (unsignedp ? long_long_unsigned_type_node |
2010 | : long_long_integer_type_node); | |
3504b199 | 2011 | if (TYPE_MODE (type) == TYPE_MODE (widest_integer_literal_type_node)) |
693a6128 GRK |
2012 | return (unsignedp ? widest_unsigned_literal_type_node |
2013 | : widest_integer_literal_type_node); | |
4a063bec RH |
2014 | |
2015 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
3504b199 | 2016 | if (TYPE_MODE (type) == TYPE_MODE (intTI_type_node)) |
4a063bec RH |
2017 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; |
2018 | #endif | |
3504b199 | 2019 | if (TYPE_MODE (type) == TYPE_MODE (intDI_type_node)) |
4a063bec | 2020 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
3504b199 | 2021 | if (TYPE_MODE (type) == TYPE_MODE (intSI_type_node)) |
4a063bec | 2022 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
3504b199 | 2023 | if (TYPE_MODE (type) == TYPE_MODE (intHI_type_node)) |
4a063bec | 2024 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
3504b199 | 2025 | if (TYPE_MODE (type) == TYPE_MODE (intQI_type_node)) |
4a063bec RH |
2026 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
2027 | ||
b6343a33 | 2028 | return type; |
693a6128 | 2029 | } |
9649812a MM |
2030 | |
2031 | /* The C version of the register_builtin_type langhook. */ | |
2032 | ||
2033 | void | |
2034 | c_register_builtin_type (tree type, const char* name) | |
2035 | { | |
2036 | tree decl; | |
2037 | ||
2038 | decl = build_decl (TYPE_DECL, get_identifier (name), type); | |
2039 | DECL_ARTIFICIAL (decl) = 1; | |
2040 | if (!TYPE_NAME (type)) | |
2041 | TYPE_NAME (type) = decl; | |
2042 | pushdecl (decl); | |
d1d3865f ZW |
2043 | |
2044 | registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
9649812a MM |
2045 | } |
2046 | ||
b30f223b | 2047 | \f |
6acfe908 JM |
2048 | /* Return the minimum number of bits needed to represent VALUE in a |
2049 | signed or unsigned type, UNSIGNEDP says which. */ | |
2050 | ||
05bccae2 | 2051 | unsigned int |
35b1a6fa | 2052 | min_precision (tree value, int unsignedp) |
6acfe908 JM |
2053 | { |
2054 | int log; | |
2055 | ||
2056 | /* If the value is negative, compute its negative minus 1. The latter | |
2057 | adjustment is because the absolute value of the largest negative value | |
2058 | is one larger than the largest positive value. This is equivalent to | |
2059 | a bit-wise negation, so use that operation instead. */ | |
2060 | ||
2061 | if (tree_int_cst_sgn (value) < 0) | |
2062 | value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value)); | |
2063 | ||
2064 | /* Return the number of bits needed, taking into account the fact | |
2065 | that we need one more bit for a signed than unsigned type. */ | |
2066 | ||
2067 | if (integer_zerop (value)) | |
2068 | log = 0; | |
6acfe908 | 2069 | else |
05bccae2 | 2070 | log = tree_floor_log2 (value); |
6acfe908 JM |
2071 | |
2072 | return log + 1 + ! unsignedp; | |
2073 | } | |
2074 | \f | |
78ef5b89 NB |
2075 | /* Print an error message for invalid operands to arith operation |
2076 | CODE. NOP_EXPR is used as a special case (see | |
2077 | c_common_truthvalue_conversion). */ | |
b30f223b RS |
2078 | |
2079 | void | |
35b1a6fa | 2080 | binary_op_error (enum tree_code code) |
b30f223b | 2081 | { |
b3694847 | 2082 | const char *opname; |
89c78d7d | 2083 | |
b30f223b RS |
2084 | switch (code) |
2085 | { | |
2086 | case NOP_EXPR: | |
2087 | error ("invalid truth-value expression"); | |
2088 | return; | |
2089 | ||
2090 | case PLUS_EXPR: | |
2091 | opname = "+"; break; | |
2092 | case MINUS_EXPR: | |
2093 | opname = "-"; break; | |
2094 | case MULT_EXPR: | |
2095 | opname = "*"; break; | |
2096 | case MAX_EXPR: | |
2097 | opname = "max"; break; | |
2098 | case MIN_EXPR: | |
2099 | opname = "min"; break; | |
2100 | case EQ_EXPR: | |
2101 | opname = "=="; break; | |
2102 | case NE_EXPR: | |
2103 | opname = "!="; break; | |
2104 | case LE_EXPR: | |
2105 | opname = "<="; break; | |
2106 | case GE_EXPR: | |
2107 | opname = ">="; break; | |
2108 | case LT_EXPR: | |
2109 | opname = "<"; break; | |
2110 | case GT_EXPR: | |
2111 | opname = ">"; break; | |
2112 | case LSHIFT_EXPR: | |
2113 | opname = "<<"; break; | |
2114 | case RSHIFT_EXPR: | |
2115 | opname = ">>"; break; | |
2116 | case TRUNC_MOD_EXPR: | |
047de90b | 2117 | case FLOOR_MOD_EXPR: |
b30f223b RS |
2118 | opname = "%"; break; |
2119 | case TRUNC_DIV_EXPR: | |
047de90b | 2120 | case FLOOR_DIV_EXPR: |
b30f223b RS |
2121 | opname = "/"; break; |
2122 | case BIT_AND_EXPR: | |
2123 | opname = "&"; break; | |
2124 | case BIT_IOR_EXPR: | |
2125 | opname = "|"; break; | |
2126 | case TRUTH_ANDIF_EXPR: | |
2127 | opname = "&&"; break; | |
2128 | case TRUTH_ORIF_EXPR: | |
2129 | opname = "||"; break; | |
2130 | case BIT_XOR_EXPR: | |
2131 | opname = "^"; break; | |
047de90b RS |
2132 | case LROTATE_EXPR: |
2133 | case RROTATE_EXPR: | |
2134 | opname = "rotate"; break; | |
6d819282 MK |
2135 | default: |
2136 | opname = "unknown"; break; | |
b30f223b RS |
2137 | } |
2138 | error ("invalid operands to binary %s", opname); | |
2139 | } | |
2140 | \f | |
2141 | /* Subroutine of build_binary_op, used for comparison operations. | |
2142 | See if the operands have both been converted from subword integer types | |
2143 | and, if so, perhaps change them both back to their original type. | |
94dccd9d RS |
2144 | This function is also responsible for converting the two operands |
2145 | to the proper common type for comparison. | |
b30f223b RS |
2146 | |
2147 | The arguments of this function are all pointers to local variables | |
2148 | of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
2149 | RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
2150 | ||
2151 | If this function returns nonzero, it means that the comparison has | |
2152 | a constant value. What this function returns is an expression for | |
2153 | that value. */ | |
2154 | ||
2155 | tree | |
35b1a6fa AJ |
2156 | shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, |
2157 | enum tree_code *rescode_ptr) | |
b30f223b | 2158 | { |
b3694847 | 2159 | tree type; |
b30f223b RS |
2160 | tree op0 = *op0_ptr; |
2161 | tree op1 = *op1_ptr; | |
2162 | int unsignedp0, unsignedp1; | |
2163 | int real1, real2; | |
2164 | tree primop0, primop1; | |
2165 | enum tree_code code = *rescode_ptr; | |
2166 | ||
2167 | /* Throw away any conversions to wider types | |
2168 | already present in the operands. */ | |
2169 | ||
2170 | primop0 = get_narrower (op0, &unsignedp0); | |
2171 | primop1 = get_narrower (op1, &unsignedp1); | |
2172 | ||
2173 | /* Handle the case that OP0 does not *contain* a conversion | |
2174 | but it *requires* conversion to FINAL_TYPE. */ | |
2175 | ||
2176 | if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
8df83eae | 2177 | unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
b30f223b | 2178 | if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) |
8df83eae | 2179 | unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
b30f223b RS |
2180 | |
2181 | /* If one of the operands must be floated, we cannot optimize. */ | |
2182 | real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
2183 | real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
2184 | ||
2185 | /* If first arg is constant, swap the args (changing operation | |
5af6001b RK |
2186 | so value is preserved), for canonicalization. Don't do this if |
2187 | the second arg is 0. */ | |
b30f223b | 2188 | |
5af6001b RK |
2189 | if (TREE_CONSTANT (primop0) |
2190 | && ! integer_zerop (primop1) && ! real_zerop (primop1)) | |
b30f223b | 2191 | { |
b3694847 SS |
2192 | tree tem = primop0; |
2193 | int temi = unsignedp0; | |
b30f223b RS |
2194 | primop0 = primop1; |
2195 | primop1 = tem; | |
2196 | tem = op0; | |
2197 | op0 = op1; | |
2198 | op1 = tem; | |
2199 | *op0_ptr = op0; | |
2200 | *op1_ptr = op1; | |
2201 | unsignedp0 = unsignedp1; | |
2202 | unsignedp1 = temi; | |
2203 | temi = real1; | |
2204 | real1 = real2; | |
2205 | real2 = temi; | |
2206 | ||
2207 | switch (code) | |
2208 | { | |
2209 | case LT_EXPR: | |
2210 | code = GT_EXPR; | |
2211 | break; | |
2212 | case GT_EXPR: | |
2213 | code = LT_EXPR; | |
2214 | break; | |
2215 | case LE_EXPR: | |
2216 | code = GE_EXPR; | |
2217 | break; | |
2218 | case GE_EXPR: | |
2219 | code = LE_EXPR; | |
2220 | break; | |
6d819282 MK |
2221 | default: |
2222 | break; | |
b30f223b RS |
2223 | } |
2224 | *rescode_ptr = code; | |
2225 | } | |
2226 | ||
2227 | /* If comparing an integer against a constant more bits wide, | |
2228 | maybe we can deduce a value of 1 or 0 independent of the data. | |
2229 | Or else truncate the constant now | |
2230 | rather than extend the variable at run time. | |
2231 | ||
2232 | This is only interesting if the constant is the wider arg. | |
2233 | Also, it is not safe if the constant is unsigned and the | |
2234 | variable arg is signed, since in this case the variable | |
2235 | would be sign-extended and then regarded as unsigned. | |
2236 | Our technique fails in this case because the lowest/highest | |
2237 | possible unsigned results don't follow naturally from the | |
2238 | lowest/highest possible values of the variable operand. | |
2239 | For just EQ_EXPR and NE_EXPR there is another technique that | |
2240 | could be used: see if the constant can be faithfully represented | |
2241 | in the other operand's type, by truncating it and reextending it | |
2242 | and see if that preserves the constant's value. */ | |
2243 | ||
2244 | if (!real1 && !real2 | |
2245 | && TREE_CODE (primop1) == INTEGER_CST | |
2246 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
2247 | { | |
2248 | int min_gt, max_gt, min_lt, max_lt; | |
2249 | tree maxval, minval; | |
2250 | /* 1 if comparison is nominally unsigned. */ | |
8df83eae | 2251 | int unsignedp = TYPE_UNSIGNED (*restype_ptr); |
b30f223b RS |
2252 | tree val; |
2253 | ||
ceef8ce4 NB |
2254 | type = c_common_signed_or_unsigned_type (unsignedp0, |
2255 | TREE_TYPE (primop0)); | |
8bbd5685 | 2256 | |
7b6d72fc | 2257 | /* In C, if TYPE is an enumeration, then we need to get its |
d1a6adeb | 2258 | min/max values from its underlying integral type, not the |
7b6d72fc MM |
2259 | enumerated type itself. In C++, TYPE_MAX_VALUE and |
2260 | TYPE_MIN_VALUE have already been set correctly on the | |
2261 | enumeration type. */ | |
2262 | if (!c_dialect_cxx() && TREE_CODE (type) == ENUMERAL_TYPE) | |
b0c48229 | 2263 | type = c_common_type_for_size (TYPE_PRECISION (type), unsignedp0); |
b30f223b RS |
2264 | |
2265 | maxval = TYPE_MAX_VALUE (type); | |
2266 | minval = TYPE_MIN_VALUE (type); | |
2267 | ||
2268 | if (unsignedp && !unsignedp0) | |
ceef8ce4 | 2269 | *restype_ptr = c_common_signed_type (*restype_ptr); |
b30f223b RS |
2270 | |
2271 | if (TREE_TYPE (primop1) != *restype_ptr) | |
2272 | primop1 = convert (*restype_ptr, primop1); | |
2273 | if (type != *restype_ptr) | |
2274 | { | |
2275 | minval = convert (*restype_ptr, minval); | |
2276 | maxval = convert (*restype_ptr, maxval); | |
2277 | } | |
2278 | ||
2279 | if (unsignedp && unsignedp0) | |
2280 | { | |
2281 | min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
2282 | max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
2283 | min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
2284 | max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
2285 | } | |
2286 | else | |
2287 | { | |
2288 | min_gt = INT_CST_LT (primop1, minval); | |
2289 | max_gt = INT_CST_LT (primop1, maxval); | |
2290 | min_lt = INT_CST_LT (minval, primop1); | |
2291 | max_lt = INT_CST_LT (maxval, primop1); | |
2292 | } | |
2293 | ||
2294 | val = 0; | |
2295 | /* This used to be a switch, but Genix compiler can't handle that. */ | |
2296 | if (code == NE_EXPR) | |
2297 | { | |
2298 | if (max_lt || min_gt) | |
de7df9eb | 2299 | val = truthvalue_true_node; |
b30f223b RS |
2300 | } |
2301 | else if (code == EQ_EXPR) | |
2302 | { | |
2303 | if (max_lt || min_gt) | |
de7df9eb | 2304 | val = truthvalue_false_node; |
b30f223b RS |
2305 | } |
2306 | else if (code == LT_EXPR) | |
2307 | { | |
2308 | if (max_lt) | |
de7df9eb | 2309 | val = truthvalue_true_node; |
b30f223b | 2310 | if (!min_lt) |
de7df9eb | 2311 | val = truthvalue_false_node; |
b30f223b RS |
2312 | } |
2313 | else if (code == GT_EXPR) | |
2314 | { | |
2315 | if (min_gt) | |
de7df9eb | 2316 | val = truthvalue_true_node; |
b30f223b | 2317 | if (!max_gt) |
de7df9eb | 2318 | val = truthvalue_false_node; |
b30f223b RS |
2319 | } |
2320 | else if (code == LE_EXPR) | |
2321 | { | |
2322 | if (!max_gt) | |
de7df9eb | 2323 | val = truthvalue_true_node; |
b30f223b | 2324 | if (min_gt) |
de7df9eb | 2325 | val = truthvalue_false_node; |
b30f223b RS |
2326 | } |
2327 | else if (code == GE_EXPR) | |
2328 | { | |
2329 | if (!min_lt) | |
de7df9eb | 2330 | val = truthvalue_true_node; |
b30f223b | 2331 | if (max_lt) |
de7df9eb | 2332 | val = truthvalue_false_node; |
b30f223b RS |
2333 | } |
2334 | ||
2335 | /* If primop0 was sign-extended and unsigned comparison specd, | |
2336 | we did a signed comparison above using the signed type bounds. | |
2337 | But the comparison we output must be unsigned. | |
2338 | ||
2339 | Also, for inequalities, VAL is no good; but if the signed | |
2340 | comparison had *any* fixed result, it follows that the | |
2341 | unsigned comparison just tests the sign in reverse | |
2342 | (positive values are LE, negative ones GE). | |
2343 | So we can generate an unsigned comparison | |
2344 | against an extreme value of the signed type. */ | |
2345 | ||
2346 | if (unsignedp && !unsignedp0) | |
2347 | { | |
2348 | if (val != 0) | |
2349 | switch (code) | |
2350 | { | |
2351 | case LT_EXPR: | |
2352 | case GE_EXPR: | |
2353 | primop1 = TYPE_MIN_VALUE (type); | |
2354 | val = 0; | |
2355 | break; | |
2356 | ||
2357 | case LE_EXPR: | |
2358 | case GT_EXPR: | |
2359 | primop1 = TYPE_MAX_VALUE (type); | |
2360 | val = 0; | |
2361 | break; | |
6d819282 MK |
2362 | |
2363 | default: | |
2364 | break; | |
b30f223b | 2365 | } |
ceef8ce4 | 2366 | type = c_common_unsigned_type (type); |
b30f223b RS |
2367 | } |
2368 | ||
5c5b2283 | 2369 | if (TREE_CODE (primop0) != INTEGER_CST) |
b30f223b | 2370 | { |
de7df9eb | 2371 | if (val == truthvalue_false_node) |
07be2a23 | 2372 | warning ("comparison is always false due to limited range of data type"); |
de7df9eb | 2373 | if (val == truthvalue_true_node) |
07be2a23 | 2374 | warning ("comparison is always true due to limited range of data type"); |
b30f223b RS |
2375 | } |
2376 | ||
2377 | if (val != 0) | |
2378 | { | |
2379 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2380 | if (TREE_SIDE_EFFECTS (primop0)) | |
2381 | return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); | |
2382 | return val; | |
2383 | } | |
2384 | ||
2385 | /* Value is not predetermined, but do the comparison | |
2386 | in the type of the operand that is not constant. | |
2387 | TYPE is already properly set. */ | |
2388 | } | |
2389 | else if (real1 && real2 | |
766f6c30 RS |
2390 | && (TYPE_PRECISION (TREE_TYPE (primop0)) |
2391 | == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
b30f223b RS |
2392 | type = TREE_TYPE (primop0); |
2393 | ||
2394 | /* If args' natural types are both narrower than nominal type | |
2395 | and both extend in the same manner, compare them | |
2396 | in the type of the wider arg. | |
2397 | Otherwise must actually extend both to the nominal | |
2398 | common type lest different ways of extending | |
2399 | alter the result. | |
2400 | (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
2401 | ||
2402 | else if (unsignedp0 == unsignedp1 && real1 == real2 | |
2403 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
2404 | && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
2405 | { | |
2406 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
ceef8ce4 | 2407 | type = c_common_signed_or_unsigned_type (unsignedp0 |
8df83eae | 2408 | || TYPE_UNSIGNED (*restype_ptr), |
ceef8ce4 | 2409 | type); |
b30f223b RS |
2410 | /* Make sure shorter operand is extended the right way |
2411 | to match the longer operand. */ | |
ceef8ce4 NB |
2412 | primop0 |
2413 | = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
2414 | TREE_TYPE (primop0)), | |
2415 | primop0); | |
2416 | primop1 | |
2417 | = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
2418 | TREE_TYPE (primop1)), | |
2419 | primop1); | |
b30f223b RS |
2420 | } |
2421 | else | |
2422 | { | |
2423 | /* Here we must do the comparison on the nominal type | |
2424 | using the args exactly as we received them. */ | |
2425 | type = *restype_ptr; | |
2426 | primop0 = op0; | |
2427 | primop1 = op1; | |
2428 | ||
2429 | if (!real1 && !real2 && integer_zerop (primop1) | |
8df83eae | 2430 | && TYPE_UNSIGNED (*restype_ptr)) |
b30f223b RS |
2431 | { |
2432 | tree value = 0; | |
2433 | switch (code) | |
2434 | { | |
2435 | case GE_EXPR: | |
5af6001b RK |
2436 | /* All unsigned values are >= 0, so we warn if extra warnings |
2437 | are requested. However, if OP0 is a constant that is | |
2438 | >= 0, the signedness of the comparison isn't an issue, | |
2439 | so suppress the warning. */ | |
2c492eef | 2440 | if (extra_warnings && !in_system_header |
5af6001b | 2441 | && ! (TREE_CODE (primop0) == INTEGER_CST |
ceef8ce4 | 2442 | && ! TREE_OVERFLOW (convert (c_common_signed_type (type), |
5af6001b | 2443 | primop0)))) |
07be2a23 | 2444 | warning ("comparison of unsigned expression >= 0 is always true"); |
de7df9eb | 2445 | value = truthvalue_true_node; |
b30f223b RS |
2446 | break; |
2447 | ||
2448 | case LT_EXPR: | |
2c492eef | 2449 | if (extra_warnings && !in_system_header |
5af6001b | 2450 | && ! (TREE_CODE (primop0) == INTEGER_CST |
ceef8ce4 | 2451 | && ! TREE_OVERFLOW (convert (c_common_signed_type (type), |
5af6001b | 2452 | primop0)))) |
07be2a23 | 2453 | warning ("comparison of unsigned expression < 0 is always false"); |
de7df9eb | 2454 | value = truthvalue_false_node; |
6d819282 MK |
2455 | break; |
2456 | ||
2457 | default: | |
2458 | break; | |
b30f223b RS |
2459 | } |
2460 | ||
2461 | if (value != 0) | |
2462 | { | |
2463 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2464 | if (TREE_SIDE_EFFECTS (primop0)) | |
2465 | return build (COMPOUND_EXPR, TREE_TYPE (value), | |
2466 | primop0, value); | |
2467 | return value; | |
2468 | } | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | *op0_ptr = convert (type, primop0); | |
2473 | *op1_ptr = convert (type, primop1); | |
2474 | ||
de7df9eb | 2475 | *restype_ptr = truthvalue_type_node; |
b30f223b RS |
2476 | |
2477 | return 0; | |
2478 | } | |
2479 | \f | |
7552da58 JJ |
2480 | /* Return a tree for the sum or difference (RESULTCODE says which) |
2481 | of pointer PTROP and integer INTOP. */ | |
2482 | ||
2483 | tree | |
35b1a6fa | 2484 | pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop) |
7552da58 JJ |
2485 | { |
2486 | tree size_exp; | |
2487 | ||
7552da58 JJ |
2488 | /* The result is a pointer of the same type that is being added. */ |
2489 | ||
2490 | tree result_type = TREE_TYPE (ptrop); | |
2491 | ||
2492 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2493 | { | |
2494 | if (pedantic || warn_pointer_arith) | |
2495 | pedwarn ("pointer of type `void *' used in arithmetic"); | |
2496 | size_exp = integer_one_node; | |
2497 | } | |
2498 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2499 | { | |
2500 | if (pedantic || warn_pointer_arith) | |
2501 | pedwarn ("pointer to a function used in arithmetic"); | |
2502 | size_exp = integer_one_node; | |
2503 | } | |
2504 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
2505 | { | |
2506 | if (pedantic || warn_pointer_arith) | |
2507 | pedwarn ("pointer to member function used in arithmetic"); | |
2508 | size_exp = integer_one_node; | |
2509 | } | |
7552da58 JJ |
2510 | else |
2511 | size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
2512 | ||
2513 | /* If what we are about to multiply by the size of the elements | |
2514 | contains a constant term, apply distributive law | |
2515 | and multiply that constant term separately. | |
2516 | This helps produce common subexpressions. */ | |
2517 | ||
2518 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
2519 | && ! TREE_CONSTANT (intop) | |
2520 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
2521 | && TREE_CONSTANT (size_exp) | |
2522 | /* If the constant comes from pointer subtraction, | |
2523 | skip this optimization--it would cause an error. */ | |
2524 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
2525 | /* If the constant is unsigned, and smaller than the pointer size, | |
2526 | then we must skip this optimization. This is because it could cause | |
2527 | an overflow error if the constant is negative but INTOP is not. */ | |
8df83eae | 2528 | && (! TYPE_UNSIGNED (TREE_TYPE (intop)) |
7552da58 JJ |
2529 | || (TYPE_PRECISION (TREE_TYPE (intop)) |
2530 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
2531 | { | |
2532 | enum tree_code subcode = resultcode; | |
2533 | tree int_type = TREE_TYPE (intop); | |
2534 | if (TREE_CODE (intop) == MINUS_EXPR) | |
2535 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
2536 | /* Convert both subexpression types to the type of intop, | |
2537 | because weird cases involving pointer arithmetic | |
2538 | can result in a sum or difference with different type args. */ | |
2539 | ptrop = build_binary_op (subcode, ptrop, | |
2540 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2541 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
2542 | } | |
2543 | ||
2544 | /* Convert the integer argument to a type the same size as sizetype | |
2545 | so the multiply won't overflow spuriously. */ | |
2546 | ||
2547 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) | |
8df83eae | 2548 | || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) |
35b1a6fa | 2549 | intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), |
8df83eae | 2550 | TYPE_UNSIGNED (sizetype)), intop); |
7552da58 JJ |
2551 | |
2552 | /* Replace the integer argument with a suitable product by the object size. | |
2553 | Do this multiplication as signed, then convert to the appropriate | |
2554 | pointer type (actually unsigned integral). */ | |
2555 | ||
2556 | intop = convert (result_type, | |
2557 | build_binary_op (MULT_EXPR, intop, | |
2558 | convert (TREE_TYPE (intop), size_exp), 1)); | |
2559 | ||
2560 | /* Create the sum or difference. */ | |
6de9cd9a | 2561 | return fold (build (resultcode, result_type, ptrop, intop)); |
7552da58 JJ |
2562 | } |
2563 | \f | |
b30f223b RS |
2564 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
2565 | or validate its data type for an `if' or `while' statement or ?..: exp. | |
2566 | ||
2567 | This preparation consists of taking the ordinary | |
2568 | representation of an expression expr and producing a valid tree | |
2569 | boolean expression describing whether expr is nonzero. We could | |
de7df9eb | 2570 | simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), |
b30f223b RS |
2571 | but we optimize comparisons, &&, ||, and !. |
2572 | ||
de7df9eb | 2573 | The resulting type should always be `truthvalue_type_node'. */ |
b30f223b RS |
2574 | |
2575 | tree | |
35b1a6fa | 2576 | c_common_truthvalue_conversion (tree expr) |
b30f223b | 2577 | { |
257e61ed RS |
2578 | if (TREE_CODE (expr) == ERROR_MARK) |
2579 | return expr; | |
2580 | ||
1998463c SB |
2581 | if (TREE_CODE (expr) == FUNCTION_DECL) |
2582 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
2583 | ||
b30f223b RS |
2584 | switch (TREE_CODE (expr)) |
2585 | { | |
b30f223b | 2586 | case EQ_EXPR: |
b30f223b RS |
2587 | case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: |
2588 | case TRUTH_ANDIF_EXPR: | |
2589 | case TRUTH_ORIF_EXPR: | |
2590 | case TRUTH_AND_EXPR: | |
2591 | case TRUTH_OR_EXPR: | |
9379fac9 | 2592 | case TRUTH_XOR_EXPR: |
1180eb10 | 2593 | case TRUTH_NOT_EXPR: |
de7df9eb | 2594 | TREE_TYPE (expr) = truthvalue_type_node; |
a360da3a | 2595 | return expr; |
18c0f675 | 2596 | |
b30f223b RS |
2597 | case ERROR_MARK: |
2598 | return expr; | |
2599 | ||
2600 | case INTEGER_CST: | |
de7df9eb | 2601 | return integer_zerop (expr) ? truthvalue_false_node : truthvalue_true_node; |
b30f223b RS |
2602 | |
2603 | case REAL_CST: | |
de7df9eb | 2604 | return real_zerop (expr) ? truthvalue_false_node : truthvalue_true_node; |
b30f223b RS |
2605 | |
2606 | case ADDR_EXPR: | |
1998463c SB |
2607 | { |
2608 | if (TREE_CODE (TREE_OPERAND (expr, 0)) == FUNCTION_DECL | |
2609 | && ! DECL_WEAK (TREE_OPERAND (expr, 0))) | |
2610 | { | |
2611 | /* Common Ada/Pascal programmer's mistake. We always warn | |
2612 | about this since it is so bad. */ | |
2613 | warning ("the address of `%D', will always evaluate as `true'", | |
2614 | TREE_OPERAND (expr, 0)); | |
2615 | return truthvalue_true_node; | |
2616 | } | |
fc0c675f | 2617 | |
1998463c SB |
2618 | /* If we are taking the address of an external decl, it might be |
2619 | zero if it is weak, so we cannot optimize. */ | |
2620 | if (DECL_P (TREE_OPERAND (expr, 0)) | |
2621 | && DECL_EXTERNAL (TREE_OPERAND (expr, 0))) | |
2622 | break; | |
2623 | ||
2624 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0))) | |
2625 | return build (COMPOUND_EXPR, truthvalue_type_node, | |
2626 | TREE_OPERAND (expr, 0), truthvalue_true_node); | |
2627 | else | |
2628 | return truthvalue_true_node; | |
2629 | } | |
b30f223b | 2630 | |
766f6c30 | 2631 | case COMPLEX_EXPR: |
f0b996c5 | 2632 | return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) |
b839fb3f | 2633 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
ae2bcd98 RS |
2634 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2635 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)), | |
766f6c30 RS |
2636 | 0); |
2637 | ||
b30f223b RS |
2638 | case NEGATE_EXPR: |
2639 | case ABS_EXPR: | |
2640 | case FLOAT_EXPR: | |
da7d8304 | 2641 | /* These don't change whether an object is nonzero or zero. */ |
ae2bcd98 | 2642 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b30f223b RS |
2643 | |
2644 | case LROTATE_EXPR: | |
2645 | case RROTATE_EXPR: | |
da7d8304 | 2646 | /* These don't change whether an object is zero or nonzero, but |
b30f223b RS |
2647 | we can't ignore them if their second arg has side-effects. */ |
2648 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
de7df9eb | 2649 | return build (COMPOUND_EXPR, truthvalue_type_node, TREE_OPERAND (expr, 1), |
ae2bcd98 | 2650 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0))); |
b30f223b | 2651 | else |
ae2bcd98 | 2652 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b57062ca | 2653 | |
b30f223b RS |
2654 | case COND_EXPR: |
2655 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
de7df9eb | 2656 | return fold (build (COND_EXPR, truthvalue_type_node, TREE_OPERAND (expr, 0), |
ae2bcd98 RS |
2657 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)), |
2658 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 2)))); | |
b30f223b RS |
2659 | |
2660 | case CONVERT_EXPR: | |
2661 | /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, | |
2662 | since that affects how `default_conversion' will behave. */ | |
2663 | if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
2664 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
2665 | break; | |
938d968e | 2666 | /* Fall through.... */ |
b30f223b RS |
2667 | case NOP_EXPR: |
2668 | /* If this is widening the argument, we can ignore it. */ | |
2669 | if (TYPE_PRECISION (TREE_TYPE (expr)) | |
2670 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
ae2bcd98 | 2671 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b30f223b RS |
2672 | break; |
2673 | ||
b30f223b | 2674 | case MINUS_EXPR: |
71925bc0 RS |
2675 | /* Perhaps reduce (x - y) != 0 to (x != y). The expressions |
2676 | aren't guaranteed to the be same for modes that can represent | |
2677 | infinity, since if x and y are both +infinity, or both | |
2678 | -infinity, then x - y is not a number. | |
2679 | ||
2680 | Note that this transformation is safe when x or y is NaN. | |
2681 | (x - y) is then NaN, and both (x - y) != 0 and x != y will | |
2682 | be false. */ | |
2683 | if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))) | |
f87550e0 | 2684 | break; |
938d968e | 2685 | /* Fall through.... */ |
f87550e0 | 2686 | case BIT_XOR_EXPR: |
d7c83727 | 2687 | /* This and MINUS_EXPR can be changed into a comparison of the |
f87550e0 | 2688 | two objects. */ |
b30f223b RS |
2689 | if (TREE_TYPE (TREE_OPERAND (expr, 0)) |
2690 | == TREE_TYPE (TREE_OPERAND (expr, 1))) | |
2691 | return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0), | |
2692 | TREE_OPERAND (expr, 1), 1); | |
2693 | return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0), | |
2694 | fold (build1 (NOP_EXPR, | |
2695 | TREE_TYPE (TREE_OPERAND (expr, 0)), | |
2696 | TREE_OPERAND (expr, 1))), 1); | |
e2aab13d | 2697 | |
fb48b1f0 | 2698 | case BIT_AND_EXPR: |
58cee643 | 2699 | if (integer_onep (TREE_OPERAND (expr, 1)) |
de7df9eb | 2700 | && TREE_TYPE (expr) != truthvalue_type_node) |
58cee643 | 2701 | /* Using convert here would cause infinite recursion. */ |
de7df9eb | 2702 | return build1 (NOP_EXPR, truthvalue_type_node, expr); |
58cee643 | 2703 | break; |
fb48b1f0 | 2704 | |
e2aab13d RS |
2705 | case MODIFY_EXPR: |
2706 | if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR) | |
2707 | warning ("suggest parentheses around assignment used as truth value"); | |
2708 | break; | |
b57062ca | 2709 | |
6d819282 MK |
2710 | default: |
2711 | break; | |
b30f223b RS |
2712 | } |
2713 | ||
f0b996c5 | 2714 | if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) |
f0b8d9aa | 2715 | { |
78ef5b89 | 2716 | tree t = save_expr (expr); |
f0b8d9aa AS |
2717 | return (build_binary_op |
2718 | ((TREE_SIDE_EFFECTS (expr) | |
2719 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
ae2bcd98 RS |
2720 | lang_hooks.truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)), |
2721 | lang_hooks.truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)), | |
f0b8d9aa AS |
2722 | 0)); |
2723 | } | |
f0b996c5 | 2724 | |
b30f223b RS |
2725 | return build_binary_op (NE_EXPR, expr, integer_zero_node, 1); |
2726 | } | |
2727 | \f | |
35b1a6fa AJ |
2728 | static tree builtin_function_2 (const char *, const char *, tree, tree, |
2729 | int, enum built_in_class, int, int, | |
2730 | tree); | |
fc2aaf30 | 2731 | |
0b73773c NH |
2732 | /* Make a variant type in the proper way for C/C++, propagating qualifiers |
2733 | down to the element type of an array. */ | |
2734 | ||
2735 | tree | |
35b1a6fa | 2736 | c_build_qualified_type (tree type, int type_quals) |
0b73773c | 2737 | { |
5a6159dd AP |
2738 | if (type == error_mark_node) |
2739 | return type; | |
2740 | ||
4b011bbf JM |
2741 | if (TREE_CODE (type) == ARRAY_TYPE) |
2742 | return build_array_type (c_build_qualified_type (TREE_TYPE (type), | |
2743 | type_quals), | |
2744 | TYPE_DOMAIN (type)); | |
2745 | ||
3932261a MM |
2746 | /* A restrict-qualified pointer type must be a pointer to object or |
2747 | incomplete type. Note that the use of POINTER_TYPE_P also allows | |
4b011bbf | 2748 | REFERENCE_TYPEs, which is appropriate for C++. */ |
3932261a MM |
2749 | if ((type_quals & TYPE_QUAL_RESTRICT) |
2750 | && (!POINTER_TYPE_P (type) | |
2751 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
2752 | { | |
2753 | error ("invalid use of `restrict'"); | |
2754 | type_quals &= ~TYPE_QUAL_RESTRICT; | |
2755 | } | |
2756 | ||
3932261a MM |
2757 | return build_qualified_type (type, type_quals); |
2758 | } | |
2759 | ||
2760 | /* Apply the TYPE_QUALS to the new DECL. */ | |
2761 | ||
2762 | void | |
35b1a6fa | 2763 | c_apply_type_quals_to_decl (int type_quals, tree decl) |
3932261a | 2764 | { |
4b011bbf | 2765 | tree type = TREE_TYPE (decl); |
5a6159dd AP |
2766 | |
2767 | if (type == error_mark_node) | |
2768 | return; | |
4b011bbf JM |
2769 | |
2770 | if (((type_quals & TYPE_QUAL_CONST) | |
2771 | || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
2772 | /* An object declared 'const' is only readonly after it is | |
2773 | initialized. We don't have any way of expressing this currently, | |
2774 | so we need to be conservative and unset TREE_READONLY for types | |
2775 | with constructors. Otherwise aliasing code will ignore stores in | |
2776 | an inline constructor. */ | |
2777 | && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
3932261a MM |
2778 | TREE_READONLY (decl) = 1; |
2779 | if (type_quals & TYPE_QUAL_VOLATILE) | |
2780 | { | |
2781 | TREE_SIDE_EFFECTS (decl) = 1; | |
2782 | TREE_THIS_VOLATILE (decl) = 1; | |
2783 | } | |
6946bc60 | 2784 | if (type_quals & TYPE_QUAL_RESTRICT) |
3932261a | 2785 | { |
4b011bbf JM |
2786 | while (type && TREE_CODE (type) == ARRAY_TYPE) |
2787 | /* Allow 'restrict' on arrays of pointers. | |
2788 | FIXME currently we just ignore it. */ | |
2789 | type = TREE_TYPE (type); | |
2790 | if (!type | |
2791 | || !POINTER_TYPE_P (type) | |
2792 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
6946bc60 | 2793 | error ("invalid use of `restrict'"); |
4b011bbf | 2794 | else if (flag_strict_aliasing && type == TREE_TYPE (decl)) |
3c5ad1ff RK |
2795 | /* Indicate we need to make a unique alias set for this pointer. |
2796 | We can't do it here because it might be pointing to an | |
2797 | incomplete type. */ | |
2798 | DECL_POINTER_ALIAS_SET (decl) = -2; | |
3932261a MM |
2799 | } |
2800 | } | |
2801 | ||
6de9cd9a DN |
2802 | /* Hash function for the problem of multiple type definitions in |
2803 | different files. This must hash all types that will compare | |
2804 | equal via comptypes to the same value. In practice it hashes | |
2805 | on some of the simple stuff and leaves the details to comptypes. */ | |
2806 | ||
2807 | static hashval_t | |
2808 | c_type_hash (const void *p) | |
2809 | { | |
2810 | int i = 0; | |
2811 | int shift, size; | |
2812 | tree t = (tree)p; | |
2813 | tree t2; | |
2814 | switch (TREE_CODE (t)) | |
2815 | { | |
2816 | /* For pointers, hash on pointee type plus some swizzling. */ | |
2817 | case POINTER_TYPE: | |
2818 | return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
2819 | /* Hash on number of elements and total size. */ | |
2820 | case ENUMERAL_TYPE: | |
2821 | shift = 3; | |
2822 | t2 = TYPE_VALUES (t); | |
2823 | break; | |
2824 | case RECORD_TYPE: | |
2825 | shift = 0; | |
2826 | t2 = TYPE_FIELDS (t); | |
2827 | break; | |
2828 | case QUAL_UNION_TYPE: | |
2829 | shift = 1; | |
2830 | t2 = TYPE_FIELDS (t); | |
2831 | break; | |
2832 | case UNION_TYPE: | |
2833 | shift = 2; | |
2834 | t2 = TYPE_FIELDS (t); | |
2835 | break; | |
2836 | default: | |
2837 | abort (); | |
2838 | } | |
2839 | for (; t2; t2 = TREE_CHAIN (t2)) | |
2840 | i++; | |
2841 | size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
2842 | return ((size << 24) | (i << shift)); | |
2843 | } | |
2844 | ||
41472af8 | 2845 | /* Return the typed-based alias set for T, which may be an expression |
3bdf5ad1 | 2846 | or a type. Return -1 if we don't do anything special. */ |
41472af8 | 2847 | |
3bdf5ad1 | 2848 | HOST_WIDE_INT |
35b1a6fa | 2849 | c_common_get_alias_set (tree t) |
41472af8 | 2850 | { |
08bc2431 | 2851 | tree u; |
6de9cd9a DN |
2852 | PTR *slot; |
2853 | static htab_t type_hash_table; | |
35b1a6fa | 2854 | |
08bc2431 MM |
2855 | /* Permit type-punning when accessing a union, provided the access |
2856 | is directly through the union. For example, this code does not | |
2857 | permit taking the address of a union member and then storing | |
2858 | through it. Even the type-punning allowed here is a GCC | |
2859 | extension, albeit a common and useful one; the C standard says | |
2860 | that such accesses have implementation-defined behavior. */ | |
2861 | for (u = t; | |
2862 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
2863 | u = TREE_OPERAND (u, 0)) | |
2864 | if (TREE_CODE (u) == COMPONENT_REF | |
2865 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
2866 | return 0; | |
ece32014 | 2867 | |
74d86f4f RH |
2868 | /* That's all the expressions we handle specially. */ |
2869 | if (! TYPE_P (t)) | |
2870 | return -1; | |
2871 | ||
95bd1dd7 | 2872 | /* The C standard guarantees that any object may be accessed via an |
74d86f4f RH |
2873 | lvalue that has character type. */ |
2874 | if (t == char_type_node | |
2875 | || t == signed_char_type_node | |
2876 | || t == unsigned_char_type_node) | |
3bdf5ad1 | 2877 | return 0; |
3932261a | 2878 | |
d18b1ed8 | 2879 | /* If it has the may_alias attribute, it can alias anything. */ |
74d86f4f | 2880 | if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t))) |
d18b1ed8 OS |
2881 | return 0; |
2882 | ||
f824e5c3 RK |
2883 | /* The C standard specifically allows aliasing between signed and |
2884 | unsigned variants of the same type. We treat the signed | |
2885 | variant as canonical. */ | |
8df83eae | 2886 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) |
8f215dce | 2887 | { |
ceef8ce4 | 2888 | tree t1 = c_common_signed_type (t); |
f824e5c3 | 2889 | |
8f215dce JJ |
2890 | /* t1 == t can happen for boolean nodes which are always unsigned. */ |
2891 | if (t1 != t) | |
2892 | return get_alias_set (t1); | |
2893 | } | |
3bdf5ad1 | 2894 | else if (POINTER_TYPE_P (t)) |
02af3af6 | 2895 | { |
3bdf5ad1 | 2896 | tree t1; |
02af3af6 MS |
2897 | |
2898 | /* Unfortunately, there is no canonical form of a pointer type. | |
2899 | In particular, if we have `typedef int I', then `int *', and | |
2900 | `I *' are different types. So, we have to pick a canonical | |
2901 | representative. We do this below. | |
d125d268 | 2902 | |
b61148dd MM |
2903 | Technically, this approach is actually more conservative that |
2904 | it needs to be. In particular, `const int *' and `int *' | |
684d9f3b | 2905 | should be in different alias sets, according to the C and C++ |
b61148dd MM |
2906 | standard, since their types are not the same, and so, |
2907 | technically, an `int **' and `const int **' cannot point at | |
2908 | the same thing. | |
2909 | ||
6de9cd9a | 2910 | But, the standard is wrong. In particular, this code is |
b61148dd MM |
2911 | legal C++: |
2912 | ||
2913 | int *ip; | |
2914 | int **ipp = &ip; | |
162f92bb | 2915 | const int* const* cipp = ipp; |
b61148dd | 2916 | |
6de9cd9a | 2917 | And, it doesn't make sense for that to be legal unless you |
b61148dd MM |
2918 | can dereference IPP and CIPP. So, we ignore cv-qualifiers on |
2919 | the pointed-to types. This issue has been reported to the | |
2920 | C++ committee. */ | |
12e1243e | 2921 | t1 = build_type_no_quals (t); |
3bdf5ad1 RK |
2922 | if (t1 != t) |
2923 | return get_alias_set (t1); | |
02af3af6 | 2924 | } |
ece32014 | 2925 | |
6de9cd9a DN |
2926 | /* Handle the case of multiple type nodes referring to "the same" type, |
2927 | which occurs with IMA. These share an alias set. FIXME: Currently only | |
2928 | C90 is handled. (In C99 type compatibility is not transitive, which | |
2929 | complicates things mightily. The alias set splay trees can theoretically | |
2930 | represent this, but insertion is tricky when you consider all the | |
2931 | different orders things might arrive in.) */ | |
2932 | ||
2933 | if (c_language != clk_c || flag_isoc99) | |
2934 | return -1; | |
2935 | ||
2936 | /* Save time if there's only one input file. */ | |
2937 | if (!current_file_decl || TREE_CHAIN (current_file_decl) == NULL_TREE) | |
2938 | return -1; | |
2939 | ||
2940 | /* Pointers need special handling if they point to any type that | |
2941 | needs special handling (below). */ | |
2942 | if (TREE_CODE (t) == POINTER_TYPE) | |
2943 | { | |
2944 | tree t2; | |
2945 | /* Find bottom type under any nested POINTERs. */ | |
2946 | for (t2 = TREE_TYPE (t); | |
2947 | TREE_CODE (t2) == POINTER_TYPE; | |
2948 | t2 = TREE_TYPE (t2)) | |
2949 | ; | |
2950 | if (TREE_CODE (t2) != RECORD_TYPE | |
2951 | && TREE_CODE (t2) != ENUMERAL_TYPE | |
2952 | && TREE_CODE (t2) != QUAL_UNION_TYPE | |
2953 | && TREE_CODE (t2) != UNION_TYPE) | |
2954 | return -1; | |
2955 | if (TYPE_SIZE (t2) == 0) | |
2956 | return -1; | |
2957 | } | |
2958 | /* These are the only cases that need special handling. */ | |
2959 | if (TREE_CODE (t) != RECORD_TYPE | |
2960 | && TREE_CODE (t) != ENUMERAL_TYPE | |
2961 | && TREE_CODE (t) != QUAL_UNION_TYPE | |
2962 | && TREE_CODE (t) != UNION_TYPE | |
2963 | && TREE_CODE (t) != POINTER_TYPE) | |
2964 | return -1; | |
2965 | /* Undefined? */ | |
2966 | if (TYPE_SIZE (t) == 0) | |
2967 | return -1; | |
2968 | ||
2969 | /* Look up t in hash table. Only one of the compatible types within each | |
2970 | alias set is recorded in the table. */ | |
2971 | if (!type_hash_table) | |
2972 | type_hash_table = htab_create (1021, c_type_hash, | |
2973 | (htab_eq) lang_hooks.types_compatible_p, | |
2974 | NULL); | |
2975 | slot = htab_find_slot (type_hash_table, t, INSERT); | |
2976 | if (*slot != NULL) | |
2977 | return TYPE_ALIAS_SET ((tree)*slot); | |
2978 | else | |
2979 | /* Our caller will assign and record (in t) a new alias set; all we need | |
2980 | to do is remember t in the hash table. */ | |
2981 | *slot = t; | |
2982 | ||
3bdf5ad1 | 2983 | return -1; |
41472af8 | 2984 | } |
0213a355 | 2985 | \f |
fa72b064 | 2986 | /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the |
ea793912 GDR |
2987 | second parameter indicates which OPERATOR is being applied. The COMPLAIN |
2988 | flag controls whether we should diagnose possibly ill-formed | |
2989 | constructs or not. */ | |
0213a355 | 2990 | tree |
35b1a6fa | 2991 | c_sizeof_or_alignof_type (tree type, enum tree_code op, int complain) |
0213a355 | 2992 | { |
fa72b064 GDR |
2993 | const char *op_name; |
2994 | tree value = NULL; | |
2995 | enum tree_code type_code = TREE_CODE (type); | |
35b1a6fa | 2996 | |
fa72b064 GDR |
2997 | my_friendly_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR, 20020720); |
2998 | op_name = op == SIZEOF_EXPR ? "sizeof" : "__alignof__"; | |
35b1a6fa | 2999 | |
fa72b064 | 3000 | if (type_code == FUNCTION_TYPE) |
0213a355 | 3001 | { |
fa72b064 GDR |
3002 | if (op == SIZEOF_EXPR) |
3003 | { | |
ea793912 | 3004 | if (complain && (pedantic || warn_pointer_arith)) |
fa72b064 GDR |
3005 | pedwarn ("invalid application of `sizeof' to a function type"); |
3006 | value = size_one_node; | |
3007 | } | |
3008 | else | |
3009 | value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
3010 | } | |
3011 | else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
3012 | { | |
35b1a6fa | 3013 | if (type_code == VOID_TYPE |
ea793912 | 3014 | && complain && (pedantic || warn_pointer_arith)) |
fa72b064 GDR |
3015 | pedwarn ("invalid application of `%s' to a void type", op_name); |
3016 | value = size_one_node; | |
0213a355 | 3017 | } |
0213a355 JM |
3018 | else if (!COMPLETE_TYPE_P (type)) |
3019 | { | |
ea793912 GDR |
3020 | if (complain) |
3021 | error ("invalid application of `%s' to an incomplete type", op_name); | |
fa72b064 | 3022 | value = size_zero_node; |
0213a355 JM |
3023 | } |
3024 | else | |
fa72b064 GDR |
3025 | { |
3026 | if (op == SIZEOF_EXPR) | |
3027 | /* Convert in case a char is more than one unit. */ | |
3028 | value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
3029 | size_int (TYPE_PRECISION (char_type_node) | |
3030 | / BITS_PER_UNIT)); | |
3031 | else | |
3032 | value = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
3033 | } | |
0213a355 | 3034 | |
fa72b064 GDR |
3035 | /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. |
3036 | TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
3037 | never happen. However, this node should really have type | |
3038 | `size_t', which is just a typedef for an ordinary integer type. */ | |
c9f8536c | 3039 | value = fold (build1 (NOP_EXPR, size_type_node, value)); |
fa72b064 | 3040 | my_friendly_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)), 20001021); |
35b1a6fa | 3041 | |
fa72b064 | 3042 | return value; |
0213a355 JM |
3043 | } |
3044 | ||
3045 | /* Implement the __alignof keyword: Return the minimum required | |
3046 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
3047 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
3048 | "aligned" __attribute__ specification). */ | |
7f4edbcb | 3049 | |
0213a355 | 3050 | tree |
35b1a6fa | 3051 | c_alignof_expr (tree expr) |
0213a355 JM |
3052 | { |
3053 | tree t; | |
3054 | ||
3055 | if (TREE_CODE (expr) == VAR_DECL) | |
3056 | t = size_int (DECL_ALIGN (expr) / BITS_PER_UNIT); | |
35b1a6fa | 3057 | |
0213a355 JM |
3058 | else if (TREE_CODE (expr) == COMPONENT_REF |
3059 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
3060 | { | |
3061 | error ("`__alignof' applied to a bit-field"); | |
3062 | t = size_one_node; | |
3063 | } | |
3064 | else if (TREE_CODE (expr) == COMPONENT_REF | |
173bf5be | 3065 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) |
0213a355 | 3066 | t = size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT); |
35b1a6fa | 3067 | |
0213a355 JM |
3068 | else if (TREE_CODE (expr) == INDIRECT_REF) |
3069 | { | |
3070 | tree t = TREE_OPERAND (expr, 0); | |
3071 | tree best = t; | |
3072 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
35b1a6fa | 3073 | |
0213a355 | 3074 | while (TREE_CODE (t) == NOP_EXPR |
173bf5be | 3075 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) |
0213a355 JM |
3076 | { |
3077 | int thisalign; | |
3078 | ||
3079 | t = TREE_OPERAND (t, 0); | |
3080 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
3081 | if (thisalign > bestalign) | |
3082 | best = t, bestalign = thisalign; | |
3083 | } | |
3084 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
3085 | } | |
3086 | else | |
3087 | return c_alignof (TREE_TYPE (expr)); | |
3088 | ||
c9f8536c | 3089 | return fold (build1 (NOP_EXPR, size_type_node, t)); |
0213a355 JM |
3090 | } |
3091 | \f | |
df061a43 RS |
3092 | /* Handle C and C++ default attributes. */ |
3093 | ||
3094 | enum built_in_attribute | |
3095 | { | |
3096 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
3097 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
3098 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
3099 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
df061a43 RS |
3100 | #include "builtin-attrs.def" |
3101 | #undef DEF_ATTR_NULL_TREE | |
3102 | #undef DEF_ATTR_INT | |
3103 | #undef DEF_ATTR_IDENT | |
3104 | #undef DEF_ATTR_TREE_LIST | |
df061a43 RS |
3105 | ATTR_LAST |
3106 | }; | |
3107 | ||
3108 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
3109 | ||
35b1a6fa | 3110 | static void c_init_attributes (void); |
df061a43 | 3111 | |
7f4edbcb | 3112 | /* Build tree nodes and builtin functions common to both C and C++ language |
6bcedb4e | 3113 | frontends. */ |
3bdf5ad1 | 3114 | |
7f4edbcb | 3115 | void |
35b1a6fa | 3116 | c_common_nodes_and_builtins (void) |
7f4edbcb | 3117 | { |
35b1a6fa | 3118 | enum builtin_type |
10841285 MM |
3119 | { |
3120 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
3121 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
3122 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
3123 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
3124 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
3125 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
3126 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, | |
3127 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
3128 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
08291658 | 3129 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
10841285 MM |
3130 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
3131 | #include "builtin-types.def" | |
3132 | #undef DEF_PRIMITIVE_TYPE | |
3133 | #undef DEF_FUNCTION_TYPE_0 | |
3134 | #undef DEF_FUNCTION_TYPE_1 | |
3135 | #undef DEF_FUNCTION_TYPE_2 | |
3136 | #undef DEF_FUNCTION_TYPE_3 | |
3137 | #undef DEF_FUNCTION_TYPE_4 | |
3138 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
3139 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
3140 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
08291658 | 3141 | #undef DEF_FUNCTION_TYPE_VAR_3 |
10841285 MM |
3142 | #undef DEF_POINTER_TYPE |
3143 | BT_LAST | |
3144 | }; | |
3145 | ||
3146 | typedef enum builtin_type builtin_type; | |
3147 | ||
173bf5be | 3148 | tree builtin_types[(int) BT_LAST]; |
eaa7c03f JM |
3149 | int wchar_type_size; |
3150 | tree array_domain_type; | |
9f720c3e | 3151 | tree va_list_ref_type_node; |
daf68dd7 | 3152 | tree va_list_arg_type_node; |
d3707adb | 3153 | |
eaa7c03f | 3154 | /* Define `int' and `char' first so that dbx will output them first. */ |
6496a589 | 3155 | record_builtin_type (RID_INT, NULL, integer_type_node); |
eaa7c03f JM |
3156 | record_builtin_type (RID_CHAR, "char", char_type_node); |
3157 | ||
3158 | /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
3159 | "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
3160 | but not C. Are the conditionals here needed? */ | |
37fa72e9 | 3161 | if (c_dialect_cxx ()) |
6496a589 | 3162 | record_builtin_type (RID_SIGNED, NULL, integer_type_node); |
eaa7c03f JM |
3163 | record_builtin_type (RID_LONG, "long int", long_integer_type_node); |
3164 | record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
3165 | record_builtin_type (RID_MAX, "long unsigned int", | |
3166 | long_unsigned_type_node); | |
37fa72e9 | 3167 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3168 | record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); |
3169 | record_builtin_type (RID_MAX, "long long int", | |
3170 | long_long_integer_type_node); | |
3171 | record_builtin_type (RID_MAX, "long long unsigned int", | |
3172 | long_long_unsigned_type_node); | |
37fa72e9 | 3173 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3174 | record_builtin_type (RID_MAX, "long long unsigned", |
3175 | long_long_unsigned_type_node); | |
3176 | record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
3177 | record_builtin_type (RID_MAX, "short unsigned int", | |
3178 | short_unsigned_type_node); | |
37fa72e9 | 3179 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3180 | record_builtin_type (RID_MAX, "unsigned short", |
3181 | short_unsigned_type_node); | |
3182 | ||
3183 | /* Define both `signed char' and `unsigned char'. */ | |
3184 | record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
3185 | record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
3186 | ||
b0c48229 NB |
3187 | /* These are types that c_common_type_for_size and |
3188 | c_common_type_for_mode use. */ | |
ae2bcd98 RS |
3189 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3190 | intQI_type_node)); | |
3191 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3192 | intHI_type_node)); | |
3193 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3194 | intSI_type_node)); | |
3195 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3196 | intDI_type_node)); | |
eaa7c03f | 3197 | #if HOST_BITS_PER_WIDE_INT >= 64 |
ae2bcd98 RS |
3198 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3199 | get_identifier ("__int128_t"), | |
3200 | intTI_type_node)); | |
eaa7c03f | 3201 | #endif |
ae2bcd98 RS |
3202 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3203 | unsigned_intQI_type_node)); | |
3204 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3205 | unsigned_intHI_type_node)); | |
3206 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3207 | unsigned_intSI_type_node)); | |
3208 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3209 | unsigned_intDI_type_node)); | |
eaa7c03f | 3210 | #if HOST_BITS_PER_WIDE_INT >= 64 |
ae2bcd98 RS |
3211 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3212 | get_identifier ("__uint128_t"), | |
3213 | unsigned_intTI_type_node)); | |
eaa7c03f JM |
3214 | #endif |
3215 | ||
3216 | /* Create the widest literal types. */ | |
3217 | widest_integer_literal_type_node | |
3218 | = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
ae2bcd98 RS |
3219 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3220 | widest_integer_literal_type_node)); | |
eaa7c03f JM |
3221 | |
3222 | widest_unsigned_literal_type_node | |
3223 | = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
ae2bcd98 RS |
3224 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3225 | widest_unsigned_literal_type_node)); | |
eaa7c03f JM |
3226 | |
3227 | /* `unsigned long' is the standard type for sizeof. | |
3228 | Note that stddef.h uses `unsigned long', | |
3229 | and this must agree, even if long and int are the same size. */ | |
c9f8536c | 3230 | size_type_node = |
eaa7c03f | 3231 | TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); |
c9f8536c MM |
3232 | signed_size_type_node = c_common_signed_type (size_type_node); |
3233 | set_sizetype (size_type_node); | |
eaa7c03f | 3234 | |
d1c38823 ZD |
3235 | pid_type_node = |
3236 | TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
3237 | ||
eaa7c03f JM |
3238 | build_common_tree_nodes_2 (flag_short_double); |
3239 | ||
6496a589 KG |
3240 | record_builtin_type (RID_FLOAT, NULL, float_type_node); |
3241 | record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
eaa7c03f JM |
3242 | record_builtin_type (RID_MAX, "long double", long_double_type_node); |
3243 | ||
ae2bcd98 RS |
3244 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3245 | get_identifier ("complex int"), | |
3246 | complex_integer_type_node)); | |
3247 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3248 | get_identifier ("complex float"), | |
3249 | complex_float_type_node)); | |
3250 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3251 | get_identifier ("complex double"), | |
3252 | complex_double_type_node)); | |
3253 | lang_hooks.decls.pushdecl | |
43577e6b NB |
3254 | (build_decl (TYPE_DECL, get_identifier ("complex long double"), |
3255 | complex_long_double_type_node)); | |
eaa7c03f | 3256 | |
03f10472 TM |
3257 | /* Types which are common to the fortran compiler and libf2c. When |
3258 | changing these, you also need to be concerned with f/com.h. */ | |
3259 | ||
3260 | if (TYPE_PRECISION (float_type_node) | |
3261 | == TYPE_PRECISION (long_integer_type_node)) | |
3262 | { | |
3263 | g77_integer_type_node = long_integer_type_node; | |
3264 | g77_uinteger_type_node = long_unsigned_type_node; | |
3265 | } | |
3266 | else if (TYPE_PRECISION (float_type_node) | |
3267 | == TYPE_PRECISION (integer_type_node)) | |
3268 | { | |
3269 | g77_integer_type_node = integer_type_node; | |
3270 | g77_uinteger_type_node = unsigned_type_node; | |
3271 | } | |
3272 | else | |
3273 | g77_integer_type_node = g77_uinteger_type_node = NULL_TREE; | |
3274 | ||
3275 | if (g77_integer_type_node != NULL_TREE) | |
3276 | { | |
ae2bcd98 RS |
3277 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3278 | get_identifier ("__g77_integer"), | |
3279 | g77_integer_type_node)); | |
3280 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3281 | get_identifier ("__g77_uinteger"), | |
3282 | g77_uinteger_type_node)); | |
03f10472 TM |
3283 | } |
3284 | ||
3285 | if (TYPE_PRECISION (float_type_node) * 2 | |
3286 | == TYPE_PRECISION (long_integer_type_node)) | |
3287 | { | |
3288 | g77_longint_type_node = long_integer_type_node; | |
3289 | g77_ulongint_type_node = long_unsigned_type_node; | |
3290 | } | |
3291 | else if (TYPE_PRECISION (float_type_node) * 2 | |
3292 | == TYPE_PRECISION (long_long_integer_type_node)) | |
3293 | { | |
3294 | g77_longint_type_node = long_long_integer_type_node; | |
3295 | g77_ulongint_type_node = long_long_unsigned_type_node; | |
3296 | } | |
3297 | else | |
3298 | g77_longint_type_node = g77_ulongint_type_node = NULL_TREE; | |
3299 | ||
3300 | if (g77_longint_type_node != NULL_TREE) | |
3301 | { | |
ae2bcd98 RS |
3302 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3303 | get_identifier ("__g77_longint"), | |
3304 | g77_longint_type_node)); | |
3305 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3306 | get_identifier ("__g77_ulongint"), | |
3307 | g77_ulongint_type_node)); | |
03f10472 TM |
3308 | } |
3309 | ||
6496a589 | 3310 | record_builtin_type (RID_VOID, NULL, void_type_node); |
eaa7c03f | 3311 | |
10841285 MM |
3312 | void_zero_node = build_int_2 (0, 0); |
3313 | TREE_TYPE (void_zero_node) = void_type_node; | |
3314 | ||
eaa7c03f JM |
3315 | void_list_node = build_void_list_node (); |
3316 | ||
3317 | /* Make a type to be the domain of a few array types | |
3318 | whose domains don't really matter. | |
3319 | 200 is small enough that it always fits in size_t | |
3320 | and large enough that it can hold most function names for the | |
3321 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
3322 | array_domain_type = build_index_type (size_int (200)); | |
3323 | ||
3324 | /* Make a type for arrays of characters. | |
3325 | With luck nothing will ever really depend on the length of this | |
3326 | array type. */ | |
3327 | char_array_type_node | |
3328 | = build_array_type (char_type_node, array_domain_type); | |
3329 | ||
3330 | /* Likewise for arrays of ints. */ | |
3331 | int_array_type_node | |
3332 | = build_array_type (integer_type_node, array_domain_type); | |
3333 | ||
10841285 MM |
3334 | string_type_node = build_pointer_type (char_type_node); |
3335 | const_string_type_node | |
3336 | = build_pointer_type (build_qualified_type | |
3337 | (char_type_node, TYPE_QUAL_CONST)); | |
3338 | ||
eaa7c03f | 3339 | /* This is special for C++ so functions can be overloaded. */ |
a11eba95 | 3340 | wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); |
eaa7c03f JM |
3341 | wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); |
3342 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
37fa72e9 | 3343 | if (c_dialect_cxx ()) |
eaa7c03f | 3344 | { |
8df83eae | 3345 | if (TYPE_UNSIGNED (wchar_type_node)) |
eaa7c03f JM |
3346 | wchar_type_node = make_unsigned_type (wchar_type_size); |
3347 | else | |
3348 | wchar_type_node = make_signed_type (wchar_type_size); | |
3349 | record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
3350 | } | |
3351 | else | |
3352 | { | |
ceef8ce4 NB |
3353 | signed_wchar_type_node = c_common_signed_type (wchar_type_node); |
3354 | unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node); | |
eaa7c03f JM |
3355 | } |
3356 | ||
3357 | /* This is for wide string constants. */ | |
3358 | wchar_array_type_node | |
3359 | = build_array_type (wchar_type_node, array_domain_type); | |
3360 | ||
5fd8e536 JM |
3361 | wint_type_node = |
3362 | TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
3363 | ||
3364 | intmax_type_node = | |
3365 | TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
3366 | uintmax_type_node = | |
3367 | TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
3368 | ||
3369 | default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
3370 | ptrdiff_type_node | |
3371 | = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
ceef8ce4 | 3372 | unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); |
5fd8e536 | 3373 | |
ae2bcd98 | 3374 | lang_hooks.decls.pushdecl |
43577e6b NB |
3375 | (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"), |
3376 | va_list_type_node)); | |
daf68dd7 | 3377 | |
ae2bcd98 | 3378 | lang_hooks.decls.pushdecl |
43577e6b NB |
3379 | (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"), |
3380 | ptrdiff_type_node)); | |
29ae8f10 | 3381 | |
ae2bcd98 | 3382 | lang_hooks.decls.pushdecl |
43577e6b NB |
3383 | (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"), |
3384 | sizetype)); | |
29ae8f10 | 3385 | |
daf68dd7 | 3386 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
9f720c3e GK |
3387 | { |
3388 | va_list_arg_type_node = va_list_ref_type_node = | |
3389 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
3390 | } | |
daf68dd7 | 3391 | else |
9f720c3e GK |
3392 | { |
3393 | va_list_arg_type_node = va_list_type_node; | |
3394 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
3395 | } | |
35b1a6fa | 3396 | |
10841285 MM |
3397 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ |
3398 | builtin_types[(int) ENUM] = VALUE; | |
3399 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
3400 | builtin_types[(int) ENUM] \ | |
3401 | = build_function_type (builtin_types[(int) RETURN], \ | |
3402 | void_list_node); | |
3403 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
3404 | builtin_types[(int) ENUM] \ | |
3405 | = build_function_type (builtin_types[(int) RETURN], \ | |
3406 | tree_cons (NULL_TREE, \ | |
3407 | builtin_types[(int) ARG1], \ | |
3408 | void_list_node)); | |
3409 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
3410 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3411 | = build_function_type \ |
10841285 MM |
3412 | (builtin_types[(int) RETURN], \ |
3413 | tree_cons (NULL_TREE, \ | |
3414 | builtin_types[(int) ARG1], \ | |
3415 | tree_cons (NULL_TREE, \ | |
3416 | builtin_types[(int) ARG2], \ | |
3417 | void_list_node))); | |
3418 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3419 | builtin_types[(int) ENUM] \ | |
3420 | = build_function_type \ | |
3421 | (builtin_types[(int) RETURN], \ | |
3422 | tree_cons (NULL_TREE, \ | |
3423 | builtin_types[(int) ARG1], \ | |
3424 | tree_cons (NULL_TREE, \ | |
3425 | builtin_types[(int) ARG2], \ | |
3426 | tree_cons (NULL_TREE, \ | |
3427 | builtin_types[(int) ARG3], \ | |
3428 | void_list_node)))); | |
3429 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
3430 | builtin_types[(int) ENUM] \ | |
3431 | = build_function_type \ | |
3432 | (builtin_types[(int) RETURN], \ | |
3433 | tree_cons (NULL_TREE, \ | |
3434 | builtin_types[(int) ARG1], \ | |
3435 | tree_cons (NULL_TREE, \ | |
3436 | builtin_types[(int) ARG2], \ | |
35b1a6fa | 3437 | tree_cons \ |
10841285 | 3438 | (NULL_TREE, \ |
35b1a6fa | 3439 | builtin_types[(int) ARG3], \ |
10841285 MM |
3440 | tree_cons (NULL_TREE, \ |
3441 | builtin_types[(int) ARG4], \ | |
3442 | void_list_node))))); | |
3443 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
3444 | builtin_types[(int) ENUM] \ | |
3445 | = build_function_type (builtin_types[(int) RETURN], NULL_TREE); | |
3446 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
3447 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3448 | = build_function_type (builtin_types[(int) RETURN], \ |
10841285 MM |
3449 | tree_cons (NULL_TREE, \ |
3450 | builtin_types[(int) ARG1], \ | |
ad3fd36f KG |
3451 | NULL_TREE)); |
3452 | ||
10841285 MM |
3453 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ |
3454 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3455 | = build_function_type \ |
10841285 MM |
3456 | (builtin_types[(int) RETURN], \ |
3457 | tree_cons (NULL_TREE, \ | |
3458 | builtin_types[(int) ARG1], \ | |
3459 | tree_cons (NULL_TREE, \ | |
3460 | builtin_types[(int) ARG2], \ | |
3461 | NULL_TREE))); | |
08291658 RS |
3462 | |
3463 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3464 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3465 | = build_function_type \ |
08291658 RS |
3466 | (builtin_types[(int) RETURN], \ |
3467 | tree_cons (NULL_TREE, \ | |
3468 | builtin_types[(int) ARG1], \ | |
3469 | tree_cons (NULL_TREE, \ | |
3470 | builtin_types[(int) ARG2], \ | |
3471 | tree_cons (NULL_TREE, \ | |
3472 | builtin_types[(int) ARG3], \ | |
3473 | NULL_TREE)))); | |
3474 | ||
10841285 MM |
3475 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ |
3476 | builtin_types[(int) ENUM] \ | |
3477 | = build_pointer_type (builtin_types[(int) TYPE]); | |
3478 | #include "builtin-types.def" | |
3479 | #undef DEF_PRIMITIVE_TYPE | |
3480 | #undef DEF_FUNCTION_TYPE_1 | |
3481 | #undef DEF_FUNCTION_TYPE_2 | |
3482 | #undef DEF_FUNCTION_TYPE_3 | |
3483 | #undef DEF_FUNCTION_TYPE_4 | |
3484 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
3485 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
08291658 RS |
3486 | #undef DEF_FUNCTION_TYPE_VAR_2 |
3487 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
10841285 MM |
3488 | #undef DEF_POINTER_TYPE |
3489 | ||
03aa99d4 | 3490 | c_init_attributes (); |
df061a43 RS |
3491 | |
3492 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, \ | |
272f51a3 | 3493 | BOTH_P, FALLBACK_P, NONANSI_P, ATTRS, IMPLICIT) \ |
10841285 MM |
3494 | if (NAME) \ |
3495 | { \ | |
3496 | tree decl; \ | |
3497 | \ | |
3498 | if (strncmp (NAME, "__builtin_", strlen ("__builtin_")) != 0) \ | |
3499 | abort (); \ | |
3500 | \ | |
3501 | if (!BOTH_P) \ | |
3502 | decl = builtin_function (NAME, builtin_types[TYPE], ENUM, \ | |
3503 | CLASS, \ | |
3504 | (FALLBACK_P \ | |
3505 | ? (NAME + strlen ("__builtin_")) \ | |
df061a43 RS |
3506 | : NULL), \ |
3507 | built_in_attributes[(int) ATTRS]); \ | |
10841285 MM |
3508 | else \ |
3509 | decl = builtin_function_2 (NAME, \ | |
3510 | NAME + strlen ("__builtin_"), \ | |
3511 | builtin_types[TYPE], \ | |
3512 | builtin_types[LIBTYPE], \ | |
3513 | ENUM, \ | |
3514 | CLASS, \ | |
3515 | FALLBACK_P, \ | |
3516 | NONANSI_P, \ | |
df061a43 | 3517 | built_in_attributes[(int) ATTRS]); \ |
10841285 MM |
3518 | \ |
3519 | built_in_decls[(int) ENUM] = decl; \ | |
272f51a3 | 3520 | if (IMPLICIT) \ |
6de9cd9a | 3521 | implicit_built_in_decls[(int) ENUM] = decl; \ |
35b1a6fa | 3522 | } |
10841285 MM |
3523 | #include "builtins.def" |
3524 | #undef DEF_BUILTIN | |
52a11cbf | 3525 | |
5fd9b178 | 3526 | targetm.init_builtins (); |
4677862a | 3527 | |
5b47282c | 3528 | main_identifier_node = get_identifier ("main"); |
7f4edbcb | 3529 | } |
d3707adb RH |
3530 | |
3531 | tree | |
35b1a6fa | 3532 | build_va_arg (tree expr, tree type) |
d3707adb RH |
3533 | { |
3534 | return build1 (VA_ARG_EXPR, type, expr); | |
3535 | } | |
fc2aaf30 JM |
3536 | |
3537 | ||
7d14c755 JM |
3538 | /* Linked list of disabled built-in functions. */ |
3539 | ||
3540 | typedef struct disabled_builtin | |
3541 | { | |
3542 | const char *name; | |
3543 | struct disabled_builtin *next; | |
3544 | } disabled_builtin; | |
3545 | static disabled_builtin *disabled_builtins = NULL; | |
3546 | ||
35b1a6fa | 3547 | static bool builtin_function_disabled_p (const char *); |
7d14c755 JM |
3548 | |
3549 | /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
3550 | begins with "__builtin_", give an error. */ | |
3551 | ||
3552 | void | |
35b1a6fa | 3553 | disable_builtin_function (const char *name) |
7d14c755 JM |
3554 | { |
3555 | if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
3556 | error ("cannot disable built-in function `%s'", name); | |
3557 | else | |
3558 | { | |
3559 | disabled_builtin *new = xmalloc (sizeof (disabled_builtin)); | |
3560 | new->name = name; | |
3561 | new->next = disabled_builtins; | |
3562 | disabled_builtins = new; | |
3563 | } | |
3564 | } | |
3565 | ||
3566 | ||
3567 | /* Return true if the built-in function NAME has been disabled, false | |
3568 | otherwise. */ | |
3569 | ||
3570 | static bool | |
35b1a6fa | 3571 | builtin_function_disabled_p (const char *name) |
7d14c755 JM |
3572 | { |
3573 | disabled_builtin *p; | |
3574 | for (p = disabled_builtins; p != NULL; p = p->next) | |
3575 | { | |
3576 | if (strcmp (name, p->name) == 0) | |
3577 | return true; | |
3578 | } | |
3579 | return false; | |
3580 | } | |
3581 | ||
3582 | ||
fc2aaf30 JM |
3583 | /* Possibly define a builtin function with one or two names. BUILTIN_NAME |
3584 | is an __builtin_-prefixed name; NAME is the ordinary name; one or both | |
3585 | of these may be NULL (though both being NULL is useless). | |
3586 | BUILTIN_TYPE is the type of the __builtin_-prefixed function; | |
3587 | TYPE is the type of the function with the ordinary name. These | |
3588 | may differ if the ordinary name is declared with a looser type to avoid | |
3589 | conflicts with headers. FUNCTION_CODE and CLASS are as for | |
3590 | builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as | |
3591 | the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME. | |
df061a43 RS |
3592 | If NONANSI_P is nonzero, the name NAME is treated as a non-ANSI name; |
3593 | ATTRS is the tree list representing the builtin's function attributes. | |
fc2aaf30 JM |
3594 | Returns the declaration of BUILTIN_NAME, if any, otherwise |
3595 | the declaration of NAME. Does not declare NAME if flag_no_builtin, | |
3596 | or if NONANSI_P and flag_no_nonansi_builtin. */ | |
3597 | ||
3598 | static tree | |
35b1a6fa AJ |
3599 | builtin_function_2 (const char *builtin_name, const char *name, |
3600 | tree builtin_type, tree type, int function_code, | |
3601 | enum built_in_class class, int library_name_p, | |
3602 | int nonansi_p, tree attrs) | |
fc2aaf30 JM |
3603 | { |
3604 | tree bdecl = NULL_TREE; | |
3605 | tree decl = NULL_TREE; | |
7f685e17 | 3606 | |
fc2aaf30 | 3607 | if (builtin_name != 0) |
7f685e17 RS |
3608 | bdecl = builtin_function (builtin_name, builtin_type, function_code, |
3609 | class, library_name_p ? name : NULL, attrs); | |
3610 | ||
7d14c755 JM |
3611 | if (name != 0 && !flag_no_builtin && !builtin_function_disabled_p (name) |
3612 | && !(nonansi_p && flag_no_nonansi_builtin)) | |
7f685e17 RS |
3613 | decl = builtin_function (name, type, function_code, class, NULL, attrs); |
3614 | ||
fc2aaf30 JM |
3615 | return (bdecl != 0 ? bdecl : decl); |
3616 | } | |
c530479e | 3617 | \f |
d72040f5 RH |
3618 | /* Nonzero if the type T promotes to int. This is (nearly) the |
3619 | integral promotions defined in ISO C99 6.3.1.1/2. */ | |
3620 | ||
3621 | bool | |
35b1a6fa | 3622 | c_promoting_integer_type_p (tree t) |
d72040f5 RH |
3623 | { |
3624 | switch (TREE_CODE (t)) | |
3625 | { | |
3626 | case INTEGER_TYPE: | |
3627 | return (TYPE_MAIN_VARIANT (t) == char_type_node | |
3628 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
3629 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
3630 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
c6c04fca RL |
3631 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node |
3632 | || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
d72040f5 RH |
3633 | |
3634 | case ENUMERAL_TYPE: | |
3635 | /* ??? Technically all enumerations not larger than an int | |
3636 | promote to an int. But this is used along code paths | |
3637 | that only want to notice a size change. */ | |
3638 | return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
3639 | ||
3640 | case BOOLEAN_TYPE: | |
3641 | return 1; | |
3642 | ||
3643 | default: | |
3644 | return 0; | |
3645 | } | |
3646 | } | |
3647 | ||
c530479e RH |
3648 | /* Return 1 if PARMS specifies a fixed number of parameters |
3649 | and none of their types is affected by default promotions. */ | |
3650 | ||
3651 | int | |
35b1a6fa | 3652 | self_promoting_args_p (tree parms) |
c530479e | 3653 | { |
b3694847 | 3654 | tree t; |
c530479e RH |
3655 | for (t = parms; t; t = TREE_CHAIN (t)) |
3656 | { | |
b3694847 | 3657 | tree type = TREE_VALUE (t); |
7e8176d7 | 3658 | |
c530479e RH |
3659 | if (TREE_CHAIN (t) == 0 && type != void_type_node) |
3660 | return 0; | |
3661 | ||
3662 | if (type == 0) | |
3663 | return 0; | |
3664 | ||
3665 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
3666 | return 0; | |
3667 | ||
d72040f5 | 3668 | if (c_promoting_integer_type_p (type)) |
c530479e RH |
3669 | return 0; |
3670 | } | |
3671 | return 1; | |
3672 | } | |
5eda3d66 | 3673 | |
0a7394bc MM |
3674 | /* Recursively examines the array elements of TYPE, until a non-array |
3675 | element type is found. */ | |
3676 | ||
3677 | tree | |
35b1a6fa | 3678 | strip_array_types (tree type) |
0a7394bc MM |
3679 | { |
3680 | while (TREE_CODE (type) == ARRAY_TYPE) | |
3681 | type = TREE_TYPE (type); | |
3682 | ||
3683 | return type; | |
3684 | } | |
3685 | ||
12ea3302 GDR |
3686 | /* Recursively remove any '*' or '&' operator from TYPE. */ |
3687 | tree | |
3688 | strip_pointer_operator (tree t) | |
3689 | { | |
3690 | while (POINTER_TYPE_P (t)) | |
3691 | t = TREE_TYPE (t); | |
3692 | return t; | |
3693 | } | |
3694 | ||
35b1a6fa | 3695 | static tree expand_unordered_cmp (tree, tree, enum tree_code, enum tree_code); |
71925bc0 RS |
3696 | |
3697 | /* Expand a call to an unordered comparison function such as | |
3698 | __builtin_isgreater(). FUNCTION is the function's declaration and | |
3699 | PARAMS a list of the values passed. For __builtin_isunordered(), | |
3700 | UNORDERED_CODE is UNORDERED_EXPR and ORDERED_CODE is NOP_EXPR. In | |
3701 | other cases, UNORDERED_CODE and ORDERED_CODE are comparison codes | |
3702 | that give the opposite of the desired result. UNORDERED_CODE is | |
3703 | used for modes that can hold NaNs and ORDERED_CODE is used for the | |
3704 | rest. */ | |
3705 | ||
3706 | static tree | |
35b1a6fa AJ |
3707 | expand_unordered_cmp (tree function, tree params, |
3708 | enum tree_code unordered_code, | |
3709 | enum tree_code ordered_code) | |
71925bc0 RS |
3710 | { |
3711 | tree arg0, arg1, type; | |
3712 | enum tree_code code0, code1; | |
3713 | ||
3714 | /* Check that we have exactly two arguments. */ | |
3715 | if (params == 0 || TREE_CHAIN (params) == 0) | |
3716 | { | |
3717 | error ("too few arguments to function `%s'", | |
3718 | IDENTIFIER_POINTER (DECL_NAME (function))); | |
3719 | return error_mark_node; | |
3720 | } | |
3721 | else if (TREE_CHAIN (TREE_CHAIN (params)) != 0) | |
3722 | { | |
3723 | error ("too many arguments to function `%s'", | |
3724 | IDENTIFIER_POINTER (DECL_NAME (function))); | |
3725 | return error_mark_node; | |
3726 | } | |
3727 | ||
3728 | arg0 = TREE_VALUE (params); | |
3729 | arg1 = TREE_VALUE (TREE_CHAIN (params)); | |
3730 | ||
3731 | code0 = TREE_CODE (TREE_TYPE (arg0)); | |
3732 | code1 = TREE_CODE (TREE_TYPE (arg1)); | |
3733 | ||
3734 | /* Make sure that the arguments have a common type of REAL. */ | |
3735 | type = 0; | |
3736 | if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE) | |
3737 | && (code1 == INTEGER_TYPE || code1 == REAL_TYPE)) | |
3738 | type = common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)); | |
3739 | ||
3740 | if (type == 0 || TREE_CODE (type) != REAL_TYPE) | |
3741 | { | |
3742 | error ("non-floating-point argument to function `%s'", | |
3743 | IDENTIFIER_POINTER (DECL_NAME (function))); | |
3744 | return error_mark_node; | |
3745 | } | |
3746 | ||
3747 | if (unordered_code == UNORDERED_EXPR) | |
3748 | { | |
3749 | if (MODE_HAS_NANS (TYPE_MODE (type))) | |
3750 | return build_binary_op (unordered_code, | |
3751 | convert (type, arg0), | |
3752 | convert (type, arg1), | |
3753 | 0); | |
3754 | else | |
3755 | return integer_zero_node; | |
3756 | } | |
3757 | ||
3758 | return build_unary_op (TRUTH_NOT_EXPR, | |
3759 | build_binary_op (MODE_HAS_NANS (TYPE_MODE (type)) | |
3760 | ? unordered_code | |
3761 | : ordered_code, | |
3762 | convert (type, arg0), | |
3763 | convert (type, arg1), | |
3764 | 0), | |
3765 | 0); | |
3766 | } | |
3767 | ||
3768 | ||
5eda3d66 RH |
3769 | /* Recognize certain built-in functions so we can make tree-codes |
3770 | other than CALL_EXPR. We do this when it enables fold-const.c | |
3771 | to do something useful. */ | |
3772 | /* ??? By rights this should go in builtins.c, but only C and C++ | |
3773 | implement build_{binary,unary}_op. Not exactly sure what bits | |
3774 | of functionality are actually needed from those functions, or | |
3775 | where the similar functionality exists in the other front ends. */ | |
3776 | ||
3777 | tree | |
35b1a6fa | 3778 | expand_tree_builtin (tree function, tree params, tree coerced_params) |
5eda3d66 | 3779 | { |
5eda3d66 RH |
3780 | if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL) |
3781 | return NULL_TREE; | |
3782 | ||
3783 | switch (DECL_FUNCTION_CODE (function)) | |
3784 | { | |
3785 | case BUILT_IN_ABS: | |
10841285 MM |
3786 | case BUILT_IN_LABS: |
3787 | case BUILT_IN_LLABS: | |
3788 | case BUILT_IN_IMAXABS: | |
5eda3d66 | 3789 | case BUILT_IN_FABS: |
10841285 MM |
3790 | case BUILT_IN_FABSL: |
3791 | case BUILT_IN_FABSF: | |
5eda3d66 RH |
3792 | if (coerced_params == 0) |
3793 | return integer_zero_node; | |
3794 | return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0); | |
3795 | ||
341e3d11 | 3796 | case BUILT_IN_CONJ: |
10841285 MM |
3797 | case BUILT_IN_CONJF: |
3798 | case BUILT_IN_CONJL: | |
341e3d11 JM |
3799 | if (coerced_params == 0) |
3800 | return integer_zero_node; | |
3801 | return build_unary_op (CONJ_EXPR, TREE_VALUE (coerced_params), 0); | |
3802 | ||
3803 | case BUILT_IN_CREAL: | |
10841285 MM |
3804 | case BUILT_IN_CREALF: |
3805 | case BUILT_IN_CREALL: | |
341e3d11 JM |
3806 | if (coerced_params == 0) |
3807 | return integer_zero_node; | |
ac054e28 JM |
3808 | return non_lvalue (build_unary_op (REALPART_EXPR, |
3809 | TREE_VALUE (coerced_params), 0)); | |
341e3d11 JM |
3810 | |
3811 | case BUILT_IN_CIMAG: | |
10841285 MM |
3812 | case BUILT_IN_CIMAGF: |
3813 | case BUILT_IN_CIMAGL: | |
341e3d11 JM |
3814 | if (coerced_params == 0) |
3815 | return integer_zero_node; | |
ac054e28 JM |
3816 | return non_lvalue (build_unary_op (IMAGPART_EXPR, |
3817 | TREE_VALUE (coerced_params), 0)); | |
341e3d11 | 3818 | |
5eda3d66 | 3819 | case BUILT_IN_ISGREATER: |
71925bc0 | 3820 | return expand_unordered_cmp (function, params, UNLE_EXPR, LE_EXPR); |
5eda3d66 RH |
3821 | |
3822 | case BUILT_IN_ISGREATEREQUAL: | |
71925bc0 | 3823 | return expand_unordered_cmp (function, params, UNLT_EXPR, LT_EXPR); |
5eda3d66 RH |
3824 | |
3825 | case BUILT_IN_ISLESS: | |
71925bc0 | 3826 | return expand_unordered_cmp (function, params, UNGE_EXPR, GE_EXPR); |
5eda3d66 RH |
3827 | |
3828 | case BUILT_IN_ISLESSEQUAL: | |
71925bc0 | 3829 | return expand_unordered_cmp (function, params, UNGT_EXPR, GT_EXPR); |
5eda3d66 RH |
3830 | |
3831 | case BUILT_IN_ISLESSGREATER: | |
71925bc0 | 3832 | return expand_unordered_cmp (function, params, UNEQ_EXPR, EQ_EXPR); |
5eda3d66 RH |
3833 | |
3834 | case BUILT_IN_ISUNORDERED: | |
71925bc0 | 3835 | return expand_unordered_cmp (function, params, UNORDERED_EXPR, NOP_EXPR); |
5eda3d66 RH |
3836 | |
3837 | default: | |
3838 | break; | |
3839 | } | |
3840 | ||
3841 | return NULL_TREE; | |
3842 | } | |
c7d87c0a | 3843 | |
86306c8e | 3844 | /* Walk the statement tree, rooted at *tp. Apply FUNC to all the |
ae499cce MM |
3845 | sub-trees of *TP in a pre-order traversal. FUNC is called with the |
3846 | DATA and the address of each sub-tree. If FUNC returns a non-NULL | |
3847 | value, the traversal is aborted, and the value returned by FUNC is | |
3848 | returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of | |
3849 | the node being visited are not walked. | |
3850 | ||
3851 | We don't need a without_duplicates variant of this one because the | |
3852 | statement tree is a tree, not a graph. */ | |
3853 | ||
35b1a6fa AJ |
3854 | tree |
3855 | walk_stmt_tree (tree *tp, walk_tree_fn func, void *data) | |
ae499cce MM |
3856 | { |
3857 | enum tree_code code; | |
3858 | int walk_subtrees; | |
3859 | tree result; | |
3860 | int i, len; | |
3861 | ||
3862 | #define WALK_SUBTREE(NODE) \ | |
3863 | do \ | |
3864 | { \ | |
3865 | result = walk_stmt_tree (&(NODE), func, data); \ | |
3866 | if (result) \ | |
3867 | return result; \ | |
3868 | } \ | |
3869 | while (0) | |
3870 | ||
3871 | /* Skip empty subtrees. */ | |
3872 | if (!*tp) | |
3873 | return NULL_TREE; | |
3874 | ||
3875 | /* Skip subtrees below non-statement nodes. */ | |
009ed910 | 3876 | if (!STATEMENT_CODE_P (TREE_CODE (*tp))) |
ae499cce MM |
3877 | return NULL_TREE; |
3878 | ||
3879 | /* Call the function. */ | |
3880 | walk_subtrees = 1; | |
3881 | result = (*func) (tp, &walk_subtrees, data); | |
3882 | ||
3883 | /* If we found something, return it. */ | |
3884 | if (result) | |
3885 | return result; | |
3886 | ||
ae499cce MM |
3887 | /* FUNC may have modified the tree, recheck that we're looking at a |
3888 | statement node. */ | |
3889 | code = TREE_CODE (*tp); | |
009ed910 | 3890 | if (!STATEMENT_CODE_P (code)) |
ae499cce MM |
3891 | return NULL_TREE; |
3892 | ||
87aee676 DN |
3893 | /* Visit the subtrees unless FUNC decided that there was nothing |
3894 | interesting below this point in the tree. */ | |
3895 | if (walk_subtrees) | |
3896 | { | |
3897 | /* Walk over all the sub-trees of this operand. Statement nodes | |
3898 | never contain RTL, and we needn't worry about TARGET_EXPRs. */ | |
3899 | len = TREE_CODE_LENGTH (code); | |
3900 | ||
3901 | /* Go through the subtrees. We need to do this in forward order so | |
3902 | that the scope of a FOR_EXPR is handled properly. */ | |
3903 | for (i = 0; i < len; ++i) | |
3904 | WALK_SUBTREE (TREE_OPERAND (*tp, i)); | |
3905 | } | |
ae499cce MM |
3906 | |
3907 | /* Finally visit the chain. This can be tail-recursion optimized if | |
3908 | we write it this way. */ | |
3909 | return walk_stmt_tree (&TREE_CHAIN (*tp), func, data); | |
3910 | ||
3911 | #undef WALK_SUBTREE | |
3912 | } | |
3913 | ||
8f17b5c5 MM |
3914 | /* Used to compare case labels. K1 and K2 are actually tree nodes |
3915 | representing case labels, or NULL_TREE for a `default' label. | |
3916 | Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
3917 | K2, and 0 if K1 and K2 are equal. */ | |
3918 | ||
3919 | int | |
35b1a6fa | 3920 | case_compare (splay_tree_key k1, splay_tree_key k2) |
8f17b5c5 MM |
3921 | { |
3922 | /* Consider a NULL key (such as arises with a `default' label) to be | |
3923 | smaller than anything else. */ | |
3924 | if (!k1) | |
3925 | return k2 ? -1 : 0; | |
3926 | else if (!k2) | |
3927 | return k1 ? 1 : 0; | |
3928 | ||
3929 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
3930 | } | |
3931 | ||
3932 | /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If | |
3933 | LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is | |
3934 | actually a `default' label. If only HIGH_VALUE is NULL_TREE, then | |
3935 | case label was declared using the usual C/C++ syntax, rather than | |
3936 | the GNU case range extension. CASES is a tree containing all the | |
3937 | case ranges processed so far; COND is the condition for the | |
3938 | switch-statement itself. Returns the CASE_LABEL created, or | |
3939 | ERROR_MARK_NODE if no CASE_LABEL is created. */ | |
3940 | ||
3941 | tree | |
35b1a6fa AJ |
3942 | c_add_case_label (splay_tree cases, tree cond, tree low_value, |
3943 | tree high_value) | |
8f17b5c5 MM |
3944 | { |
3945 | tree type; | |
3946 | tree label; | |
3947 | tree case_label; | |
3948 | splay_tree_node node; | |
3949 | ||
3950 | /* Create the LABEL_DECL itself. */ | |
6de9cd9a | 3951 | label = create_artificial_label (); |
8f17b5c5 MM |
3952 | |
3953 | /* If there was an error processing the switch condition, bail now | |
3954 | before we get more confused. */ | |
3955 | if (!cond || cond == error_mark_node) | |
6de9cd9a | 3956 | goto error_out; |
8f17b5c5 | 3957 | |
35b1a6fa AJ |
3958 | if ((low_value && TREE_TYPE (low_value) |
3959 | && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
8f17b5c5 MM |
3960 | || (high_value && TREE_TYPE (high_value) |
3961 | && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
3962 | error ("pointers are not permitted as case values"); | |
3963 | ||
3964 | /* Case ranges are a GNU extension. */ | |
3965 | if (high_value && pedantic) | |
37fa72e9 | 3966 | pedwarn ("range expressions in switch statements are non-standard"); |
8f17b5c5 MM |
3967 | |
3968 | type = TREE_TYPE (cond); | |
3969 | if (low_value) | |
3970 | { | |
3971 | low_value = check_case_value (low_value); | |
3972 | low_value = convert_and_check (type, low_value); | |
3973 | } | |
3974 | if (high_value) | |
3975 | { | |
3976 | high_value = check_case_value (high_value); | |
3977 | high_value = convert_and_check (type, high_value); | |
3978 | } | |
3979 | ||
3980 | /* If an error has occurred, bail out now. */ | |
3981 | if (low_value == error_mark_node || high_value == error_mark_node) | |
6de9cd9a | 3982 | goto error_out; |
8f17b5c5 MM |
3983 | |
3984 | /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
3985 | really a case range, even though it was written that way. Remove | |
3986 | the HIGH_VALUE to simplify later processing. */ | |
3987 | if (tree_int_cst_equal (low_value, high_value)) | |
3988 | high_value = NULL_TREE; | |
35b1a6fa AJ |
3989 | if (low_value && high_value |
3990 | && !tree_int_cst_lt (low_value, high_value)) | |
8f17b5c5 MM |
3991 | warning ("empty range specified"); |
3992 | ||
3993 | /* Look up the LOW_VALUE in the table of case labels we already | |
3994 | have. */ | |
3995 | node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
3996 | /* If there was not an exact match, check for overlapping ranges. | |
3997 | There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
3998 | that's a `default' label and the only overlap is an exact match. */ | |
3999 | if (!node && (low_value || high_value)) | |
4000 | { | |
4001 | splay_tree_node low_bound; | |
4002 | splay_tree_node high_bound; | |
4003 | ||
4004 | /* Even though there wasn't an exact match, there might be an | |
4005 | overlap between this case range and another case range. | |
4006 | Since we've (inductively) not allowed any overlapping case | |
4007 | ranges, we simply need to find the greatest low case label | |
4008 | that is smaller that LOW_VALUE, and the smallest low case | |
4009 | label that is greater than LOW_VALUE. If there is an overlap | |
4010 | it will occur in one of these two ranges. */ | |
4011 | low_bound = splay_tree_predecessor (cases, | |
4012 | (splay_tree_key) low_value); | |
4013 | high_bound = splay_tree_successor (cases, | |
4014 | (splay_tree_key) low_value); | |
4015 | ||
4016 | /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
4017 | the LOW_VALUE, so there is no need to check unless the | |
4018 | LOW_BOUND is in fact itself a case range. */ | |
4019 | if (low_bound | |
4020 | && CASE_HIGH ((tree) low_bound->value) | |
4021 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
4022 | low_value) >= 0) | |
4023 | node = low_bound; | |
4024 | /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
4025 | range is bigger than the low end of the current range, so we | |
4026 | are only interested if the current range is a real range, and | |
4027 | not an ordinary case label. */ | |
35b1a6fa | 4028 | else if (high_bound |
8f17b5c5 MM |
4029 | && high_value |
4030 | && (tree_int_cst_compare ((tree) high_bound->key, | |
4031 | high_value) | |
4032 | <= 0)) | |
4033 | node = high_bound; | |
4034 | } | |
4035 | /* If there was an overlap, issue an error. */ | |
4036 | if (node) | |
4037 | { | |
4038 | tree duplicate = CASE_LABEL_DECL ((tree) node->value); | |
4039 | ||
4040 | if (high_value) | |
4041 | { | |
4042 | error ("duplicate (or overlapping) case value"); | |
ddd2d57e | 4043 | error ("%Jthis is the first entry overlapping that value", duplicate); |
8f17b5c5 MM |
4044 | } |
4045 | else if (low_value) | |
4046 | { | |
4047 | error ("duplicate case value") ; | |
ddd2d57e | 4048 | error ("%Jpreviously used here", duplicate); |
8f17b5c5 MM |
4049 | } |
4050 | else | |
4051 | { | |
4052 | error ("multiple default labels in one switch"); | |
ddd2d57e | 4053 | error ("%Jthis is the first default label", duplicate); |
8f17b5c5 | 4054 | } |
6de9cd9a | 4055 | goto error_out; |
8f17b5c5 MM |
4056 | } |
4057 | ||
4058 | /* Add a CASE_LABEL to the statement-tree. */ | |
4059 | case_label = add_stmt (build_case_label (low_value, high_value, label)); | |
4060 | /* Register this case label in the splay tree. */ | |
35b1a6fa | 4061 | splay_tree_insert (cases, |
8f17b5c5 MM |
4062 | (splay_tree_key) low_value, |
4063 | (splay_tree_value) case_label); | |
4064 | ||
4065 | return case_label; | |
6de9cd9a DN |
4066 | |
4067 | error_out: | |
4068 | /* Add a label so that the back-end doesn't think that the beginning o | |
4069 | the switch is unreachable. Note that we do not add a case label, as | |
4070 | that just leads to duplicates and thence to aborts later on. */ | |
4071 | if (!cases->root) | |
4072 | { | |
4073 | tree t = create_artificial_label (); | |
4074 | add_stmt (build_stmt (LABEL_STMT, t)); | |
4075 | } | |
4076 | return error_mark_node; | |
4077 | } | |
4078 | ||
4079 | /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
4080 | Used to verify that case values match up with enumerator values. */ | |
4081 | ||
4082 | static void | |
4083 | match_case_to_enum_1 (tree key, tree type, tree label) | |
4084 | { | |
4085 | char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
4086 | ||
4087 | /* ??? Not working too hard to print the double-word value. | |
4088 | Should perhaps be done with %lwd in the diagnostic routines? */ | |
4089 | if (TREE_INT_CST_HIGH (key) == 0) | |
4090 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
4091 | TREE_INT_CST_LOW (key)); | |
4092 | else if (!TYPE_UNSIGNED (type) | |
4093 | && TREE_INT_CST_HIGH (key) == -1 | |
4094 | && TREE_INT_CST_LOW (key) != 0) | |
4095 | snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
4096 | -TREE_INT_CST_LOW (key)); | |
4097 | else | |
4098 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
4099 | TREE_INT_CST_HIGH (key), TREE_INT_CST_LOW (key)); | |
4100 | ||
4101 | if (TYPE_NAME (type) == 0) | |
4102 | warning ("%Jcase value `%s' not in enumerated type", | |
4103 | CASE_LABEL_DECL (label), buf); | |
4104 | else | |
4105 | warning ("%Jcase value `%s' not in enumerated type `%T'", | |
4106 | CASE_LABEL_DECL (label), buf, type); | |
4107 | } | |
4108 | ||
4109 | static int | |
4110 | match_case_to_enum (splay_tree_node node, void *data) | |
4111 | { | |
4112 | tree label = (tree) node->value; | |
4113 | tree type = data; | |
4114 | ||
4115 | /* Skip default case. */ | |
4116 | if (!CASE_LOW (label)) | |
4117 | return 0; | |
4118 | ||
4119 | /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear | |
4120 | when we did our enum->case scan. Reset our scratch bit after. */ | |
4121 | if (!TREE_ADDRESSABLE (label)) | |
4122 | match_case_to_enum_1 (CASE_LOW (label), type, label); | |
4123 | else | |
4124 | TREE_ADDRESSABLE (label) = 0; | |
4125 | ||
4126 | /* If CASE_HIGH is non-null, we have a range. Here we must search. | |
4127 | Note that the old code in stmt.c did not check for the values in | |
4128 | the range either, just the endpoints. */ | |
4129 | if (CASE_HIGH (label)) | |
4130 | { | |
4131 | tree chain, key = CASE_HIGH (label); | |
4132 | ||
4133 | for (chain = TYPE_VALUES (type); | |
4134 | chain && !tree_int_cst_equal (key, TREE_VALUE (chain)); | |
4135 | chain = TREE_CHAIN (chain)) | |
4136 | continue; | |
4137 | if (!chain) | |
4138 | match_case_to_enum_1 (key, type, label); | |
4139 | } | |
4140 | ||
4141 | return 0; | |
4142 | } | |
4143 | ||
4144 | /* Handle -Wswitch*. Called from the front end after parsing the switch | |
4145 | construct. */ | |
4146 | /* ??? Should probably be somewhere generic, since other languages besides | |
4147 | C and C++ would want this. We'd want to agree on the datastructure, | |
4148 | however, which is a problem. Alternately, we operate on gimplified | |
4149 | switch_exprs, which I don't especially like. At the moment, however, | |
4150 | C/C++ are the only tree-ssa languages that support enumerations at all, | |
4151 | so the point is moot. */ | |
4152 | ||
4153 | void | |
4154 | c_do_switch_warnings (splay_tree cases, tree switch_stmt) | |
4155 | { | |
4156 | splay_tree_node default_node; | |
4157 | location_t *switch_locus; | |
4158 | tree type; | |
4159 | ||
4160 | if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
4161 | return; | |
4162 | ||
4163 | switch_locus = EXPR_LOCUS (switch_stmt); | |
4164 | if (!switch_locus) | |
4165 | switch_locus = &input_location; | |
4166 | type = SWITCH_TYPE (switch_stmt); | |
4167 | ||
4168 | default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); | |
4169 | if (warn_switch_default && !default_node) | |
4170 | warning ("%Hswitch missing default case", switch_locus); | |
4171 | ||
4172 | /* If the switch expression was an enumerated type, check that | |
4173 | exactly all enumeration literals are covered by the cases. | |
4174 | The check is made when -Wswitch was specified and there is no | |
4175 | default case, or when -Wswitch-enum was specified. */ | |
4176 | if (((warn_switch && !default_node) || warn_switch_enum) | |
4177 | && type && TREE_CODE (type) == ENUMERAL_TYPE | |
4178 | && TREE_CODE (SWITCH_COND (switch_stmt)) != INTEGER_CST) | |
4179 | { | |
4180 | tree chain; | |
4181 | ||
4182 | /* The time complexity here is O(N*lg(N)) worst case, but for the | |
4183 | common case of monotonically increasing enumerators, it is | |
4184 | O(N), since the nature of the splay tree will keep the next | |
4185 | element adjacent to the root at all times. */ | |
4186 | ||
4187 | for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) | |
4188 | { | |
4189 | splay_tree_node node | |
4190 | = splay_tree_lookup (cases, (splay_tree_key) TREE_VALUE (chain)); | |
4191 | ||
4192 | if (node) | |
4193 | { | |
4194 | /* Mark the CASE_LOW part of the case entry as seen, so | |
4195 | that we save time later. Choose TREE_ADDRESSABLE | |
4196 | randomly as a bit that won't have been set to-date. */ | |
4197 | tree label = (tree) node->value; | |
4198 | TREE_ADDRESSABLE (label) = 1; | |
4199 | } | |
4200 | else | |
4201 | { | |
4202 | /* Warn if there are enumerators that don't correspond to | |
4203 | case expressions. */ | |
4204 | warning ("%Henumeration value `%E' not handled in switch", | |
4205 | switch_locus, TREE_PURPOSE (chain)); | |
4206 | } | |
4207 | } | |
4208 | ||
4209 | /* Warn if there are case expressions that don't correspond to | |
4210 | enumerators. This can occur since C and C++ don't enforce | |
4211 | type-checking of assignments to enumeration variables. | |
4212 | ||
4213 | The time complexity here is O(N**2) worst case, since we've | |
4214 | not sorted the enumeration values. However, in the absence | |
4215 | of case ranges this is O(N), since all single cases that | |
4216 | corresponded to enumerations have been marked above. */ | |
4217 | ||
4218 | splay_tree_foreach (cases, match_case_to_enum, type); | |
4219 | } | |
8f17b5c5 MM |
4220 | } |
4221 | ||
6b665219 MM |
4222 | /* Finish an expression taking the address of LABEL (an |
4223 | IDENTIFIER_NODE). Returns an expression for the address. */ | |
15b732b2 | 4224 | |
35b1a6fa AJ |
4225 | tree |
4226 | finish_label_address_expr (tree label) | |
15b732b2 NB |
4227 | { |
4228 | tree result; | |
4229 | ||
4230 | if (pedantic) | |
37fa72e9 | 4231 | pedwarn ("taking the address of a label is non-standard"); |
15b732b2 | 4232 | |
6b665219 MM |
4233 | if (label == error_mark_node) |
4234 | return error_mark_node; | |
4235 | ||
15b732b2 NB |
4236 | label = lookup_label (label); |
4237 | if (label == NULL_TREE) | |
4238 | result = null_pointer_node; | |
4239 | else | |
4240 | { | |
4241 | TREE_USED (label) = 1; | |
4242 | result = build1 (ADDR_EXPR, ptr_type_node, label); | |
15b732b2 NB |
4243 | /* The current function in not necessarily uninlinable. |
4244 | Computed gotos are incompatible with inlining, but the value | |
4245 | here could be used only in a diagnostic, for example. */ | |
4246 | } | |
4247 | ||
4248 | return result; | |
4249 | } | |
4250 | ||
8f17b5c5 | 4251 | /* Hook used by expand_expr to expand language-specific tree codes. */ |
6de9cd9a DN |
4252 | /* The only things that should go here are bits needed to expand |
4253 | constant initalizers. Everything else should be handled by the | |
4254 | gimplification routines. */ | |
8f17b5c5 MM |
4255 | |
4256 | rtx | |
0fab64a3 MM |
4257 | c_expand_expr (tree exp, rtx target, enum machine_mode tmode, |
4258 | int modifier /* Actually enum_modifier. */, | |
4259 | rtx *alt_rtl) | |
8f17b5c5 MM |
4260 | { |
4261 | switch (TREE_CODE (exp)) | |
4262 | { | |
db3acfa5 JM |
4263 | case COMPOUND_LITERAL_EXPR: |
4264 | { | |
4265 | /* Initialize the anonymous variable declared in the compound | |
4266 | literal, then return the variable. */ | |
4267 | tree decl = COMPOUND_LITERAL_EXPR_DECL (exp); | |
4268 | emit_local_var (decl); | |
0fab64a3 | 4269 | return expand_expr_real (decl, target, tmode, modifier, alt_rtl); |
db3acfa5 JM |
4270 | } |
4271 | ||
8f17b5c5 MM |
4272 | default: |
4273 | abort (); | |
4274 | } | |
8f17b5c5 MM |
4275 | } |
4276 | ||
4277 | /* Hook used by safe_from_p to handle language-specific tree codes. */ | |
4278 | ||
4279 | int | |
35b1a6fa | 4280 | c_safe_from_p (rtx target, tree exp) |
8f17b5c5 MM |
4281 | { |
4282 | /* We can see statements here when processing the body of a | |
4283 | statement-expression. For a declaration statement declaring a | |
4284 | variable, look at the variable's initializer. */ | |
35b1a6fa | 4285 | if (TREE_CODE (exp) == DECL_STMT) |
8f17b5c5 MM |
4286 | { |
4287 | tree decl = DECL_STMT_DECL (exp); | |
4288 | ||
4289 | if (TREE_CODE (decl) == VAR_DECL | |
4290 | && DECL_INITIAL (decl) | |
4291 | && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0)) | |
4292 | return 0; | |
4293 | } | |
4294 | ||
4295 | /* For any statement, we must follow the statement-chain. */ | |
009ed910 | 4296 | if (STATEMENT_CODE_P (TREE_CODE (exp)) && TREE_CHAIN (exp)) |
8f17b5c5 MM |
4297 | return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0); |
4298 | ||
4299 | /* Assume everything else is safe. */ | |
4300 | return 1; | |
4301 | } | |
4302 | ||
3fe30ff6 RH |
4303 | /* Hook used by unsafe_for_reeval to handle language-specific tree codes. */ |
4304 | ||
4305 | int | |
35b1a6fa | 4306 | c_common_unsafe_for_reeval (tree exp) |
3fe30ff6 | 4307 | { |
caaf2272 JJ |
4308 | /* Statement expressions may not be reevaluated, likewise compound |
4309 | literals. */ | |
4310 | if (TREE_CODE (exp) == STMT_EXPR | |
4311 | || TREE_CODE (exp) == COMPOUND_LITERAL_EXPR) | |
3fe30ff6 RH |
4312 | return 2; |
4313 | ||
4314 | /* Walk all other expressions. */ | |
4315 | return -1; | |
4316 | } | |
4317 | ||
db3acfa5 JM |
4318 | /* Hook used by staticp to handle language-specific tree codes. */ |
4319 | ||
4320 | int | |
35b1a6fa | 4321 | c_staticp (tree exp) |
db3acfa5 JM |
4322 | { |
4323 | if (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR | |
4324 | && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))) | |
4325 | return 1; | |
4326 | return 0; | |
4327 | } | |
19552aa5 JM |
4328 | \f |
4329 | ||
4330 | /* Given a boolean expression ARG, return a tree representing an increment | |
4331 | or decrement (as indicated by CODE) of ARG. The front end must check for | |
4332 | invalid cases (e.g., decrement in C++). */ | |
4333 | tree | |
35b1a6fa | 4334 | boolean_increment (enum tree_code code, tree arg) |
19552aa5 JM |
4335 | { |
4336 | tree val; | |
de7df9eb | 4337 | tree true_res = boolean_true_node; |
37fa72e9 | 4338 | |
19552aa5 JM |
4339 | arg = stabilize_reference (arg); |
4340 | switch (code) | |
4341 | { | |
4342 | case PREINCREMENT_EXPR: | |
4343 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
4344 | break; | |
4345 | case POSTINCREMENT_EXPR: | |
4346 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
4347 | arg = save_expr (arg); | |
4348 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
4349 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4350 | break; | |
4351 | case PREDECREMENT_EXPR: | |
4352 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg)); | |
4353 | break; | |
4354 | case POSTDECREMENT_EXPR: | |
4355 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg)); | |
4356 | arg = save_expr (arg); | |
4357 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
4358 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4359 | break; | |
4360 | default: | |
4361 | abort (); | |
4362 | } | |
4363 | TREE_SIDE_EFFECTS (val) = 1; | |
4364 | return val; | |
4365 | } | |
03dc0325 | 4366 | \f |
cb60f38d NB |
4367 | /* Built-in macros for stddef.h, that require macros defined in this |
4368 | file. */ | |
460bd0e3 | 4369 | void |
35b1a6fa | 4370 | c_stddef_cpp_builtins(void) |
3df89291 | 4371 | { |
5279d739 ZW |
4372 | builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); |
4373 | builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
4374 | builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
4375 | builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
676997cf RH |
4376 | } |
4377 | ||
6431177a | 4378 | static void |
35b1a6fa | 4379 | c_init_attributes (void) |
6431177a JM |
4380 | { |
4381 | /* Fill in the built_in_attributes array. */ | |
4382 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
4383 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
4384 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
4385 | built_in_attributes[(int) ENUM] = build_int_2 (VALUE, VALUE < 0 ? -1 : 0); | |
4386 | #define DEF_ATTR_IDENT(ENUM, STRING) \ | |
4387 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
4388 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
4389 | built_in_attributes[(int) ENUM] \ | |
4390 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
4391 | built_in_attributes[(int) VALUE], \ | |
4392 | built_in_attributes[(int) CHAIN]); | |
6431177a JM |
4393 | #include "builtin-attrs.def" |
4394 | #undef DEF_ATTR_NULL_TREE | |
4395 | #undef DEF_ATTR_INT | |
4396 | #undef DEF_ATTR_IDENT | |
4397 | #undef DEF_ATTR_TREE_LIST | |
03dc0325 | 4398 | } |
26f943fd | 4399 | |
349ae713 NB |
4400 | /* Attribute handlers common to C front ends. */ |
4401 | ||
4402 | /* Handle a "packed" attribute; arguments as in | |
4403 | struct attribute_spec.handler. */ | |
4404 | ||
4405 | static tree | |
35b1a6fa | 4406 | handle_packed_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4407 | int flags, bool *no_add_attrs) |
349ae713 | 4408 | { |
c6e4cc53 | 4409 | if (TYPE_P (*node)) |
349ae713 NB |
4410 | { |
4411 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
c6e4cc53 NS |
4412 | *node = build_type_copy (*node); |
4413 | TYPE_PACKED (*node) = 1; | |
4414 | if (TYPE_MAIN_VARIANT (*node) == *node) | |
4415 | { | |
4416 | /* If it is the main variant, then pack the other variants | |
4417 | too. This happens in, | |
4418 | ||
4419 | struct Foo { | |
4420 | struct Foo const *ptr; // creates a variant w/o packed flag | |
4421 | } __ attribute__((packed)); // packs it now. | |
4422 | */ | |
4423 | tree probe; | |
4424 | ||
4425 | for (probe = *node; probe; probe = TYPE_NEXT_VARIANT (probe)) | |
4426 | TYPE_PACKED (probe) = 1; | |
4427 | } | |
4428 | ||
349ae713 NB |
4429 | } |
4430 | else if (TREE_CODE (*node) == FIELD_DECL) | |
4431 | DECL_PACKED (*node) = 1; | |
4432 | /* We can't set DECL_PACKED for a VAR_DECL, because the bit is | |
c6e4cc53 NS |
4433 | used for DECL_REGISTER. It wouldn't mean anything anyway. |
4434 | We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
4435 | that changes what the typedef is typing. */ | |
349ae713 NB |
4436 | else |
4437 | { | |
4438 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4439 | *no_add_attrs = true; | |
4440 | } | |
4441 | ||
4442 | return NULL_TREE; | |
4443 | } | |
4444 | ||
4445 | /* Handle a "nocommon" attribute; arguments as in | |
4446 | struct attribute_spec.handler. */ | |
4447 | ||
4448 | static tree | |
35b1a6fa AJ |
4449 | handle_nocommon_attribute (tree *node, tree name, |
4450 | tree args ATTRIBUTE_UNUSED, | |
a742c759 | 4451 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4452 | { |
4453 | if (TREE_CODE (*node) == VAR_DECL) | |
4454 | DECL_COMMON (*node) = 0; | |
4455 | else | |
4456 | { | |
4457 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4458 | *no_add_attrs = true; | |
4459 | } | |
4460 | ||
4461 | return NULL_TREE; | |
4462 | } | |
4463 | ||
4464 | /* Handle a "common" attribute; arguments as in | |
4465 | struct attribute_spec.handler. */ | |
4466 | ||
4467 | static tree | |
35b1a6fa | 4468 | handle_common_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4469 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4470 | { |
4471 | if (TREE_CODE (*node) == VAR_DECL) | |
4472 | DECL_COMMON (*node) = 1; | |
4473 | else | |
4474 | { | |
4475 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4476 | *no_add_attrs = true; | |
4477 | } | |
4478 | ||
4479 | return NULL_TREE; | |
4480 | } | |
4481 | ||
4482 | /* Handle a "noreturn" attribute; arguments as in | |
4483 | struct attribute_spec.handler. */ | |
4484 | ||
4485 | static tree | |
35b1a6fa | 4486 | handle_noreturn_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4487 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4488 | { |
4489 | tree type = TREE_TYPE (*node); | |
4490 | ||
4491 | /* See FIXME comment in c_common_attribute_table. */ | |
4492 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4493 | TREE_THIS_VOLATILE (*node) = 1; | |
4494 | else if (TREE_CODE (type) == POINTER_TYPE | |
4495 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4496 | TREE_TYPE (*node) | |
4497 | = build_pointer_type | |
4498 | (build_type_variant (TREE_TYPE (type), | |
c29726e2 | 4499 | TYPE_READONLY (TREE_TYPE (type)), 1)); |
349ae713 NB |
4500 | else |
4501 | { | |
4502 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4503 | *no_add_attrs = true; | |
4504 | } | |
4505 | ||
4506 | return NULL_TREE; | |
4507 | } | |
4508 | ||
4509 | /* Handle a "noinline" attribute; arguments as in | |
4510 | struct attribute_spec.handler. */ | |
4511 | ||
4512 | static tree | |
35b1a6fa AJ |
4513 | handle_noinline_attribute (tree *node, tree name, |
4514 | tree args ATTRIBUTE_UNUSED, | |
a742c759 | 4515 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4516 | { |
4517 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4518 | DECL_UNINLINABLE (*node) = 1; | |
4519 | else | |
4520 | { | |
4521 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4522 | *no_add_attrs = true; | |
4523 | } | |
4524 | ||
4525 | return NULL_TREE; | |
4526 | } | |
4527 | ||
4528 | /* Handle a "always_inline" attribute; arguments as in | |
4529 | struct attribute_spec.handler. */ | |
4530 | ||
4531 | static tree | |
35b1a6fa AJ |
4532 | handle_always_inline_attribute (tree *node, tree name, |
4533 | tree args ATTRIBUTE_UNUSED, | |
4534 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 4535 | bool *no_add_attrs) |
349ae713 NB |
4536 | { |
4537 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4538 | { | |
4539 | /* Do nothing else, just set the attribute. We'll get at | |
4540 | it later with lookup_attribute. */ | |
4541 | } | |
4542 | else | |
4543 | { | |
4544 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4545 | *no_add_attrs = true; | |
4546 | } | |
4547 | ||
4548 | return NULL_TREE; | |
4549 | } | |
4550 | ||
4551 | /* Handle a "used" attribute; arguments as in | |
4552 | struct attribute_spec.handler. */ | |
4553 | ||
4554 | static tree | |
35b1a6fa | 4555 | handle_used_attribute (tree *pnode, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4556 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 | 4557 | { |
d7ddbe24 RH |
4558 | tree node = *pnode; |
4559 | ||
4560 | if (TREE_CODE (node) == FUNCTION_DECL | |
4561 | || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
4d7d0451 | 4562 | { |
4d7d0451 JH |
4563 | TREE_USED (node) = 1; |
4564 | } | |
349ae713 NB |
4565 | else |
4566 | { | |
4567 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4568 | *no_add_attrs = true; | |
4569 | } | |
4570 | ||
4571 | return NULL_TREE; | |
4572 | } | |
4573 | ||
4574 | /* Handle a "unused" attribute; arguments as in | |
4575 | struct attribute_spec.handler. */ | |
4576 | ||
4577 | static tree | |
35b1a6fa | 4578 | handle_unused_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4579 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4580 | { |
4581 | if (DECL_P (*node)) | |
4582 | { | |
4583 | tree decl = *node; | |
4584 | ||
4585 | if (TREE_CODE (decl) == PARM_DECL | |
4586 | || TREE_CODE (decl) == VAR_DECL | |
4587 | || TREE_CODE (decl) == FUNCTION_DECL | |
4588 | || TREE_CODE (decl) == LABEL_DECL | |
4589 | || TREE_CODE (decl) == TYPE_DECL) | |
4590 | TREE_USED (decl) = 1; | |
4591 | else | |
4592 | { | |
4593 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4594 | *no_add_attrs = true; | |
4595 | } | |
4596 | } | |
4597 | else | |
4598 | { | |
4599 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4600 | *node = build_type_copy (*node); | |
4601 | TREE_USED (*node) = 1; | |
4602 | } | |
4603 | ||
4604 | return NULL_TREE; | |
4605 | } | |
4606 | ||
4607 | /* Handle a "const" attribute; arguments as in | |
4608 | struct attribute_spec.handler. */ | |
4609 | ||
4610 | static tree | |
35b1a6fa | 4611 | handle_const_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4612 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4613 | { |
4614 | tree type = TREE_TYPE (*node); | |
4615 | ||
4616 | /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
4617 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4618 | TREE_READONLY (*node) = 1; | |
4619 | else if (TREE_CODE (type) == POINTER_TYPE | |
4620 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4621 | TREE_TYPE (*node) | |
4622 | = build_pointer_type | |
4623 | (build_type_variant (TREE_TYPE (type), 1, | |
4624 | TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
4625 | else | |
4626 | { | |
4627 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4628 | *no_add_attrs = true; | |
4629 | } | |
4630 | ||
4631 | return NULL_TREE; | |
4632 | } | |
4633 | ||
4634 | /* Handle a "transparent_union" attribute; arguments as in | |
4635 | struct attribute_spec.handler. */ | |
4636 | ||
4637 | static tree | |
35b1a6fa AJ |
4638 | handle_transparent_union_attribute (tree *node, tree name, |
4639 | tree args ATTRIBUTE_UNUSED, int flags, | |
a742c759 | 4640 | bool *no_add_attrs) |
349ae713 NB |
4641 | { |
4642 | tree decl = NULL_TREE; | |
4643 | tree *type = NULL; | |
4644 | int is_type = 0; | |
4645 | ||
4646 | if (DECL_P (*node)) | |
4647 | { | |
4648 | decl = *node; | |
4649 | type = &TREE_TYPE (decl); | |
4650 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4651 | } | |
4652 | else if (TYPE_P (*node)) | |
4653 | type = node, is_type = 1; | |
4654 | ||
4655 | if (is_type | |
4656 | && TREE_CODE (*type) == UNION_TYPE | |
4657 | && (decl == 0 | |
4658 | || (TYPE_FIELDS (*type) != 0 | |
4659 | && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))))) | |
4660 | { | |
4661 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4662 | *type = build_type_copy (*type); | |
4663 | TYPE_TRANSPARENT_UNION (*type) = 1; | |
4664 | } | |
4665 | else if (decl != 0 && TREE_CODE (decl) == PARM_DECL | |
4666 | && TREE_CODE (*type) == UNION_TYPE | |
4667 | && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))) | |
4668 | DECL_TRANSPARENT_UNION (decl) = 1; | |
4669 | else | |
4670 | { | |
4671 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4672 | *no_add_attrs = true; | |
4673 | } | |
4674 | ||
4675 | return NULL_TREE; | |
4676 | } | |
4677 | ||
4678 | /* Handle a "constructor" attribute; arguments as in | |
4679 | struct attribute_spec.handler. */ | |
4680 | ||
4681 | static tree | |
35b1a6fa AJ |
4682 | handle_constructor_attribute (tree *node, tree name, |
4683 | tree args ATTRIBUTE_UNUSED, | |
4684 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 4685 | bool *no_add_attrs) |
349ae713 NB |
4686 | { |
4687 | tree decl = *node; | |
4688 | tree type = TREE_TYPE (decl); | |
4689 | ||
4690 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4691 | && TREE_CODE (type) == FUNCTION_TYPE | |
4692 | && decl_function_context (decl) == 0) | |
4693 | { | |
4694 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
4695 | TREE_USED (decl) = 1; | |
4696 | } | |
4697 | else | |
4698 | { | |
4699 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4700 | *no_add_attrs = true; | |
4701 | } | |
4702 | ||
4703 | return NULL_TREE; | |
4704 | } | |
4705 | ||
4706 | /* Handle a "destructor" attribute; arguments as in | |
4707 | struct attribute_spec.handler. */ | |
4708 | ||
4709 | static tree | |
35b1a6fa AJ |
4710 | handle_destructor_attribute (tree *node, tree name, |
4711 | tree args ATTRIBUTE_UNUSED, | |
4712 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 4713 | bool *no_add_attrs) |
349ae713 NB |
4714 | { |
4715 | tree decl = *node; | |
4716 | tree type = TREE_TYPE (decl); | |
4717 | ||
4718 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4719 | && TREE_CODE (type) == FUNCTION_TYPE | |
4720 | && decl_function_context (decl) == 0) | |
4721 | { | |
4722 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
4723 | TREE_USED (decl) = 1; | |
4724 | } | |
4725 | else | |
4726 | { | |
4727 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4728 | *no_add_attrs = true; | |
4729 | } | |
4730 | ||
4731 | return NULL_TREE; | |
4732 | } | |
4733 | ||
4734 | /* Handle a "mode" attribute; arguments as in | |
4735 | struct attribute_spec.handler. */ | |
4736 | ||
4737 | static tree | |
35b1a6fa | 4738 | handle_mode_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 4739 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4740 | { |
4741 | tree type = *node; | |
4742 | ||
4743 | *no_add_attrs = true; | |
4744 | ||
4745 | if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) | |
4746 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4747 | else | |
4748 | { | |
4749 | int j; | |
4750 | const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); | |
4751 | int len = strlen (p); | |
4752 | enum machine_mode mode = VOIDmode; | |
4753 | tree typefm; | |
4977bab6 | 4754 | tree ptr_type; |
349ae713 NB |
4755 | |
4756 | if (len > 4 && p[0] == '_' && p[1] == '_' | |
4757 | && p[len - 1] == '_' && p[len - 2] == '_') | |
4758 | { | |
703ad42b | 4759 | char *newp = alloca (len - 1); |
349ae713 NB |
4760 | |
4761 | strcpy (newp, &p[2]); | |
4762 | newp[len - 4] = '\0'; | |
4763 | p = newp; | |
4764 | } | |
4765 | ||
4766 | /* Change this type to have a type with the specified mode. | |
4767 | First check for the special modes. */ | |
4768 | if (! strcmp (p, "byte")) | |
4769 | mode = byte_mode; | |
4770 | else if (!strcmp (p, "word")) | |
4771 | mode = word_mode; | |
4772 | else if (! strcmp (p, "pointer")) | |
4773 | mode = ptr_mode; | |
4774 | else | |
4775 | for (j = 0; j < NUM_MACHINE_MODES; j++) | |
4776 | if (!strcmp (p, GET_MODE_NAME (j))) | |
4777 | mode = (enum machine_mode) j; | |
4778 | ||
4779 | if (mode == VOIDmode) | |
4a5eab38 PB |
4780 | { |
4781 | error ("unknown machine mode `%s'", p); | |
4782 | return NULL_TREE; | |
4783 | } | |
4784 | ||
4785 | if (VECTOR_MODE_P (mode)) | |
4786 | { | |
4787 | warning ("specifying vector types with __attribute__ ((mode)) " | |
4788 | "is deprecated"); | |
4789 | warning ("use __attribute__ ((vector_size)) instead"); | |
4790 | } | |
4791 | ||
8df83eae | 4792 | typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type)); |
4a5eab38 | 4793 | if (typefm == NULL_TREE) |
349ae713 | 4794 | error ("no data type for mode `%s'", p); |
4a5eab38 | 4795 | |
4977bab6 ZW |
4796 | else if ((TREE_CODE (type) == POINTER_TYPE |
4797 | || TREE_CODE (type) == REFERENCE_TYPE) | |
5fd9b178 | 4798 | && !targetm.valid_pointer_mode (mode)) |
4977bab6 | 4799 | error ("invalid pointer mode `%s'", p); |
349ae713 | 4800 | else |
cb2a532e AH |
4801 | { |
4802 | /* If this is a vector, make sure we either have hardware | |
4803 | support, or we can emulate it. */ | |
9f629a21 | 4804 | if (VECTOR_MODE_P (mode) && !vector_mode_valid_p (mode)) |
cb2a532e AH |
4805 | { |
4806 | error ("unable to emulate '%s'", GET_MODE_NAME (mode)); | |
4807 | return NULL_TREE; | |
4808 | } | |
4809 | ||
4977bab6 ZW |
4810 | if (TREE_CODE (type) == POINTER_TYPE) |
4811 | { | |
4812 | ptr_type = build_pointer_type_for_mode (TREE_TYPE (type), | |
22421b79 | 4813 | mode, false); |
4977bab6 ZW |
4814 | *node = ptr_type; |
4815 | } | |
4816 | else if (TREE_CODE (type) == REFERENCE_TYPE) | |
4817 | { | |
4818 | ptr_type = build_reference_type_for_mode (TREE_TYPE (type), | |
22421b79 | 4819 | mode, false); |
4977bab6 ZW |
4820 | *node = ptr_type; |
4821 | } | |
4822 | else | |
4a5eab38 | 4823 | *node = typefm; |
cb2a532e AH |
4824 | /* No need to layout the type here. The caller should do this. */ |
4825 | } | |
349ae713 NB |
4826 | } |
4827 | ||
4828 | return NULL_TREE; | |
4829 | } | |
4830 | ||
4831 | /* Handle a "section" attribute; arguments as in | |
4832 | struct attribute_spec.handler. */ | |
4833 | ||
4834 | static tree | |
35b1a6fa | 4835 | handle_section_attribute (tree *node, tree name ATTRIBUTE_UNUSED, tree args, |
a742c759 | 4836 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4837 | { |
4838 | tree decl = *node; | |
4839 | ||
4840 | if (targetm.have_named_sections) | |
4841 | { | |
4842 | if ((TREE_CODE (decl) == FUNCTION_DECL | |
4843 | || TREE_CODE (decl) == VAR_DECL) | |
4844 | && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
4845 | { | |
4846 | if (TREE_CODE (decl) == VAR_DECL | |
4847 | && current_function_decl != NULL_TREE | |
4848 | && ! TREE_STATIC (decl)) | |
4849 | { | |
ddd2d57e | 4850 | error ("%Jsection attribute cannot be specified for " |
6de9cd9a | 4851 | "local variables", decl); |
349ae713 NB |
4852 | *no_add_attrs = true; |
4853 | } | |
4854 | ||
4855 | /* The decl may have already been given a section attribute | |
4856 | from a previous declaration. Ensure they match. */ | |
4857 | else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
4858 | && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
4859 | TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
4860 | { | |
ddd2d57e | 4861 | error ("%Jsection of '%D' conflicts with previous declaration", |
6de9cd9a | 4862 | *node, *node); |
349ae713 NB |
4863 | *no_add_attrs = true; |
4864 | } | |
4865 | else | |
4866 | DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
4867 | } | |
4868 | else | |
4869 | { | |
ddd2d57e | 4870 | error ("%Jsection attribute not allowed for '%D'", *node, *node); |
349ae713 NB |
4871 | *no_add_attrs = true; |
4872 | } | |
4873 | } | |
4874 | else | |
4875 | { | |
ddd2d57e | 4876 | error ("%Jsection attributes are not supported for this target", *node); |
349ae713 NB |
4877 | *no_add_attrs = true; |
4878 | } | |
4879 | ||
4880 | return NULL_TREE; | |
4881 | } | |
4882 | ||
4883 | /* Handle a "aligned" attribute; arguments as in | |
4884 | struct attribute_spec.handler. */ | |
4885 | ||
4886 | static tree | |
35b1a6fa | 4887 | handle_aligned_attribute (tree *node, tree name ATTRIBUTE_UNUSED, tree args, |
a742c759 | 4888 | int flags, bool *no_add_attrs) |
349ae713 NB |
4889 | { |
4890 | tree decl = NULL_TREE; | |
4891 | tree *type = NULL; | |
4892 | int is_type = 0; | |
4893 | tree align_expr = (args ? TREE_VALUE (args) | |
4894 | : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
4895 | int i; | |
4896 | ||
4897 | if (DECL_P (*node)) | |
4898 | { | |
4899 | decl = *node; | |
4900 | type = &TREE_TYPE (decl); | |
4901 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4902 | } | |
4903 | else if (TYPE_P (*node)) | |
4904 | type = node, is_type = 1; | |
4905 | ||
4906 | /* Strip any NOPs of any kind. */ | |
4907 | while (TREE_CODE (align_expr) == NOP_EXPR | |
4908 | || TREE_CODE (align_expr) == CONVERT_EXPR | |
4909 | || TREE_CODE (align_expr) == NON_LVALUE_EXPR) | |
4910 | align_expr = TREE_OPERAND (align_expr, 0); | |
4911 | ||
4912 | if (TREE_CODE (align_expr) != INTEGER_CST) | |
4913 | { | |
4914 | error ("requested alignment is not a constant"); | |
4915 | *no_add_attrs = true; | |
4916 | } | |
4917 | else if ((i = tree_log2 (align_expr)) == -1) | |
4918 | { | |
4919 | error ("requested alignment is not a power of 2"); | |
4920 | *no_add_attrs = true; | |
4921 | } | |
4922 | else if (i > HOST_BITS_PER_INT - 2) | |
4923 | { | |
4924 | error ("requested alignment is too large"); | |
4925 | *no_add_attrs = true; | |
4926 | } | |
4927 | else if (is_type) | |
4928 | { | |
4929 | /* If we have a TYPE_DECL, then copy the type, so that we | |
4930 | don't accidentally modify a builtin type. See pushdecl. */ | |
4931 | if (decl && TREE_TYPE (decl) != error_mark_node | |
4932 | && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
4933 | { | |
4934 | tree tt = TREE_TYPE (decl); | |
4935 | *type = build_type_copy (*type); | |
4936 | DECL_ORIGINAL_TYPE (decl) = tt; | |
4937 | TYPE_NAME (*type) = decl; | |
4938 | TREE_USED (*type) = TREE_USED (decl); | |
4939 | TREE_TYPE (decl) = *type; | |
4940 | } | |
4941 | else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4942 | *type = build_type_copy (*type); | |
4943 | ||
4944 | TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT; | |
4945 | TYPE_USER_ALIGN (*type) = 1; | |
4946 | } | |
4947 | else if (TREE_CODE (decl) != VAR_DECL | |
4948 | && TREE_CODE (decl) != FIELD_DECL) | |
4949 | { | |
ddd2d57e | 4950 | error ("%Jalignment may not be specified for '%D'", decl, decl); |
349ae713 NB |
4951 | *no_add_attrs = true; |
4952 | } | |
4953 | else | |
4954 | { | |
4955 | DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT; | |
4956 | DECL_USER_ALIGN (decl) = 1; | |
4957 | } | |
4958 | ||
4959 | return NULL_TREE; | |
4960 | } | |
4961 | ||
4962 | /* Handle a "weak" attribute; arguments as in | |
4963 | struct attribute_spec.handler. */ | |
4964 | ||
4965 | static tree | |
35b1a6fa AJ |
4966 | handle_weak_attribute (tree *node, tree name ATTRIBUTE_UNUSED, |
4967 | tree args ATTRIBUTE_UNUSED, | |
4968 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 4969 | bool *no_add_attrs ATTRIBUTE_UNUSED) |
349ae713 NB |
4970 | { |
4971 | declare_weak (*node); | |
4972 | ||
4973 | return NULL_TREE; | |
4974 | } | |
4975 | ||
4976 | /* Handle an "alias" attribute; arguments as in | |
4977 | struct attribute_spec.handler. */ | |
4978 | ||
4979 | static tree | |
35b1a6fa | 4980 | handle_alias_attribute (tree *node, tree name, tree args, |
a742c759 | 4981 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
4982 | { |
4983 | tree decl = *node; | |
4984 | ||
4985 | if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
4986 | || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl))) | |
4987 | { | |
ddd2d57e | 4988 | error ("%J'%D' defined both normally and as an alias", decl, decl); |
349ae713 NB |
4989 | *no_add_attrs = true; |
4990 | } | |
f6a76b9f RH |
4991 | |
4992 | /* Note that the very first time we process a nested declaration, | |
4993 | decl_function_context will not be set. Indeed, *would* never | |
4994 | be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
4995 | we do below. After such frobbery, pushdecl would set the context. | |
4996 | In any case, this is never what we want. */ | |
4997 | else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
349ae713 NB |
4998 | { |
4999 | tree id; | |
5000 | ||
5001 | id = TREE_VALUE (args); | |
5002 | if (TREE_CODE (id) != STRING_CST) | |
5003 | { | |
5004 | error ("alias arg not a string"); | |
5005 | *no_add_attrs = true; | |
5006 | return NULL_TREE; | |
5007 | } | |
5008 | id = get_identifier (TREE_STRING_POINTER (id)); | |
5009 | /* This counts as a use of the object pointed to. */ | |
5010 | TREE_USED (id) = 1; | |
5011 | ||
5012 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
5013 | DECL_INITIAL (decl) = error_mark_node; | |
5014 | else | |
6de9cd9a DN |
5015 | { |
5016 | DECL_EXTERNAL (decl) = 0; | |
5017 | TREE_STATIC (decl) = 1; | |
5018 | } | |
349ae713 NB |
5019 | } |
5020 | else | |
5021 | { | |
5022 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5023 | *no_add_attrs = true; | |
5024 | } | |
5025 | ||
5026 | return NULL_TREE; | |
5027 | } | |
5028 | ||
5029 | /* Handle an "visibility" attribute; arguments as in | |
5030 | struct attribute_spec.handler. */ | |
5031 | ||
5032 | static tree | |
35b1a6fa AJ |
5033 | handle_visibility_attribute (tree *node, tree name, tree args, |
5034 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 5035 | bool *no_add_attrs) |
349ae713 NB |
5036 | { |
5037 | tree decl = *node; | |
968b41a1 MA |
5038 | tree id = TREE_VALUE (args); |
5039 | ||
5040 | *no_add_attrs = true; | |
349ae713 NB |
5041 | |
5042 | if (decl_function_context (decl) != 0 || ! TREE_PUBLIC (decl)) | |
5043 | { | |
5044 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
968b41a1 | 5045 | return NULL_TREE; |
349ae713 | 5046 | } |
349ae713 | 5047 | |
968b41a1 MA |
5048 | if (TREE_CODE (id) != STRING_CST) |
5049 | { | |
5050 | error ("visibility arg not a string"); | |
5051 | return NULL_TREE; | |
349ae713 NB |
5052 | } |
5053 | ||
968b41a1 MA |
5054 | if (strcmp (TREE_STRING_POINTER (id), "default") == 0) |
5055 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
5056 | else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) | |
5057 | DECL_VISIBILITY (decl) = VISIBILITY_INTERNAL; | |
5058 | else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) | |
5059 | DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; | |
5060 | else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) | |
5061 | DECL_VISIBILITY (decl) = VISIBILITY_PROTECTED; | |
5062 | else | |
5063 | error ("visibility arg must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); | |
5064 | ||
349ae713 NB |
5065 | return NULL_TREE; |
5066 | } | |
5067 | ||
dce81a1a JJ |
5068 | /* Handle an "tls_model" attribute; arguments as in |
5069 | struct attribute_spec.handler. */ | |
5070 | ||
5071 | static tree | |
35b1a6fa | 5072 | handle_tls_model_attribute (tree *node, tree name, tree args, |
a742c759 | 5073 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
dce81a1a JJ |
5074 | { |
5075 | tree decl = *node; | |
5076 | ||
5077 | if (! DECL_THREAD_LOCAL (decl)) | |
5078 | { | |
5079 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5080 | *no_add_attrs = true; | |
5081 | } | |
5082 | else | |
5083 | { | |
5084 | tree id; | |
5085 | ||
5086 | id = TREE_VALUE (args); | |
5087 | if (TREE_CODE (id) != STRING_CST) | |
5088 | { | |
5089 | error ("tls_model arg not a string"); | |
5090 | *no_add_attrs = true; | |
5091 | return NULL_TREE; | |
5092 | } | |
5093 | if (strcmp (TREE_STRING_POINTER (id), "local-exec") | |
5094 | && strcmp (TREE_STRING_POINTER (id), "initial-exec") | |
5095 | && strcmp (TREE_STRING_POINTER (id), "local-dynamic") | |
5096 | && strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
5097 | { | |
5098 | error ("tls_model arg must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
5099 | *no_add_attrs = true; | |
5100 | return NULL_TREE; | |
5101 | } | |
5102 | } | |
5103 | ||
5104 | return NULL_TREE; | |
5105 | } | |
5106 | ||
349ae713 NB |
5107 | /* Handle a "no_instrument_function" attribute; arguments as in |
5108 | struct attribute_spec.handler. */ | |
5109 | ||
5110 | static tree | |
35b1a6fa AJ |
5111 | handle_no_instrument_function_attribute (tree *node, tree name, |
5112 | tree args ATTRIBUTE_UNUSED, | |
5113 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 5114 | bool *no_add_attrs) |
349ae713 NB |
5115 | { |
5116 | tree decl = *node; | |
5117 | ||
5118 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
5119 | { | |
ddd2d57e | 5120 | error ("%J'%E' attribute applies only to functions", decl, name); |
349ae713 NB |
5121 | *no_add_attrs = true; |
5122 | } | |
5123 | else if (DECL_INITIAL (decl)) | |
5124 | { | |
ddd2d57e | 5125 | error ("%Jcan't set '%E' attribute after definition", decl, name); |
349ae713 NB |
5126 | *no_add_attrs = true; |
5127 | } | |
5128 | else | |
5129 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
5130 | ||
5131 | return NULL_TREE; | |
5132 | } | |
5133 | ||
5134 | /* Handle a "malloc" attribute; arguments as in | |
5135 | struct attribute_spec.handler. */ | |
5136 | ||
5137 | static tree | |
35b1a6fa | 5138 | handle_malloc_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 5139 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
5140 | { |
5141 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5142 | DECL_IS_MALLOC (*node) = 1; | |
5143 | /* ??? TODO: Support types. */ | |
5144 | else | |
5145 | { | |
5146 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5147 | *no_add_attrs = true; | |
5148 | } | |
5149 | ||
5150 | return NULL_TREE; | |
5151 | } | |
5152 | ||
5153 | /* Handle a "no_limit_stack" attribute; arguments as in | |
5154 | struct attribute_spec.handler. */ | |
5155 | ||
5156 | static tree | |
35b1a6fa AJ |
5157 | handle_no_limit_stack_attribute (tree *node, tree name, |
5158 | tree args ATTRIBUTE_UNUSED, | |
5159 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 5160 | bool *no_add_attrs) |
349ae713 NB |
5161 | { |
5162 | tree decl = *node; | |
5163 | ||
5164 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
5165 | { | |
ddd2d57e | 5166 | error ("%J'%E' attribute applies only to functions", decl, name); |
349ae713 NB |
5167 | *no_add_attrs = true; |
5168 | } | |
5169 | else if (DECL_INITIAL (decl)) | |
5170 | { | |
ddd2d57e | 5171 | error ("%Jcan't set '%E' attribute after definition", decl, name); |
349ae713 NB |
5172 | *no_add_attrs = true; |
5173 | } | |
5174 | else | |
5175 | DECL_NO_LIMIT_STACK (decl) = 1; | |
5176 | ||
5177 | return NULL_TREE; | |
5178 | } | |
5179 | ||
5180 | /* Handle a "pure" attribute; arguments as in | |
5181 | struct attribute_spec.handler. */ | |
5182 | ||
5183 | static tree | |
35b1a6fa | 5184 | handle_pure_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 5185 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
349ae713 NB |
5186 | { |
5187 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5188 | DECL_IS_PURE (*node) = 1; | |
5189 | /* ??? TODO: Support types. */ | |
5190 | else | |
5191 | { | |
5192 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5193 | *no_add_attrs = true; | |
5194 | } | |
5195 | ||
5196 | return NULL_TREE; | |
5197 | } | |
5198 | ||
5199 | /* Handle a "deprecated" attribute; arguments as in | |
5200 | struct attribute_spec.handler. */ | |
35b1a6fa | 5201 | |
349ae713 | 5202 | static tree |
35b1a6fa AJ |
5203 | handle_deprecated_attribute (tree *node, tree name, |
5204 | tree args ATTRIBUTE_UNUSED, int flags, | |
a742c759 | 5205 | bool *no_add_attrs) |
349ae713 NB |
5206 | { |
5207 | tree type = NULL_TREE; | |
5208 | int warn = 0; | |
5209 | const char *what = NULL; | |
35b1a6fa | 5210 | |
349ae713 NB |
5211 | if (DECL_P (*node)) |
5212 | { | |
5213 | tree decl = *node; | |
5214 | type = TREE_TYPE (decl); | |
35b1a6fa | 5215 | |
349ae713 NB |
5216 | if (TREE_CODE (decl) == TYPE_DECL |
5217 | || TREE_CODE (decl) == PARM_DECL | |
5218 | || TREE_CODE (decl) == VAR_DECL | |
5219 | || TREE_CODE (decl) == FUNCTION_DECL | |
5220 | || TREE_CODE (decl) == FIELD_DECL) | |
5221 | TREE_DEPRECATED (decl) = 1; | |
5222 | else | |
5223 | warn = 1; | |
5224 | } | |
5225 | else if (TYPE_P (*node)) | |
5226 | { | |
5227 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
5228 | *node = build_type_copy (*node); | |
5229 | TREE_DEPRECATED (*node) = 1; | |
5230 | type = *node; | |
5231 | } | |
5232 | else | |
5233 | warn = 1; | |
35b1a6fa | 5234 | |
349ae713 NB |
5235 | if (warn) |
5236 | { | |
5237 | *no_add_attrs = true; | |
5238 | if (type && TYPE_NAME (type)) | |
5239 | { | |
5240 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
5241 | what = IDENTIFIER_POINTER (TYPE_NAME (*node)); | |
5242 | else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
5243 | && DECL_NAME (TYPE_NAME (type))) | |
5244 | what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
5245 | } | |
5246 | if (what) | |
5247 | warning ("`%s' attribute ignored for `%s'", | |
5248 | IDENTIFIER_POINTER (name), what); | |
5249 | else | |
35b1a6fa | 5250 | warning ("`%s' attribute ignored", |
349ae713 NB |
5251 | IDENTIFIER_POINTER (name)); |
5252 | } | |
5253 | ||
5254 | return NULL_TREE; | |
5255 | } | |
5256 | ||
349ae713 NB |
5257 | /* Handle a "vector_size" attribute; arguments as in |
5258 | struct attribute_spec.handler. */ | |
5259 | ||
5260 | static tree | |
35b1a6fa AJ |
5261 | handle_vector_size_attribute (tree *node, tree name, tree args, |
5262 | int flags ATTRIBUTE_UNUSED, | |
a742c759 | 5263 | bool *no_add_attrs) |
349ae713 NB |
5264 | { |
5265 | unsigned HOST_WIDE_INT vecsize, nunits; | |
5266 | enum machine_mode mode, orig_mode, new_mode; | |
4a5eab38 | 5267 | tree type = *node, new_type, size; |
349ae713 NB |
5268 | |
5269 | *no_add_attrs = true; | |
5270 | ||
4a5eab38 PB |
5271 | /* Stripping NON_LVALUE_EXPR allows declarations such as |
5272 | typedef short v4si __attribute__((vector_size (4 * sizeof(short)))). */ | |
5273 | size = TREE_VALUE (args); | |
5274 | if (TREE_CODE (size) == NON_LVALUE_EXPR) | |
5275 | size = TREE_OPERAND (size, 0); | |
5276 | ||
5277 | if (! host_integerp (size, 1)) | |
349ae713 NB |
5278 | { |
5279 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5280 | return NULL_TREE; | |
5281 | } | |
5282 | ||
5283 | /* Get the vector size (in bytes). */ | |
4a5eab38 | 5284 | vecsize = tree_low_cst (size, 1); |
349ae713 NB |
5285 | |
5286 | /* We need to provide for vector pointers, vector arrays, and | |
5287 | functions returning vectors. For example: | |
5288 | ||
5289 | __attribute__((vector_size(16))) short *foo; | |
5290 | ||
5291 | In this case, the mode is SI, but the type being modified is | |
5292 | HI, so we need to look further. */ | |
5293 | ||
5294 | while (POINTER_TYPE_P (type) | |
5295 | || TREE_CODE (type) == FUNCTION_TYPE | |
43dc123f | 5296 | || TREE_CODE (type) == METHOD_TYPE |
349ae713 NB |
5297 | || TREE_CODE (type) == ARRAY_TYPE) |
5298 | type = TREE_TYPE (type); | |
5299 | ||
5300 | /* Get the mode of the type being modified. */ | |
5301 | orig_mode = TYPE_MODE (type); | |
5302 | ||
5303 | if (TREE_CODE (type) == RECORD_TYPE | |
5304 | || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT | |
5305 | && GET_MODE_CLASS (orig_mode) != MODE_INT) | |
5306 | || ! host_integerp (TYPE_SIZE_UNIT (type), 1)) | |
5307 | { | |
5308 | error ("invalid vector type for attribute `%s'", | |
5309 | IDENTIFIER_POINTER (name)); | |
5310 | return NULL_TREE; | |
5311 | } | |
5312 | ||
5313 | /* Calculate how many units fit in the vector. */ | |
5314 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
5315 | ||
5316 | /* Find a suitably sized vector. */ | |
5317 | new_mode = VOIDmode; | |
5318 | for (mode = GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_mode) == MODE_INT | |
5319 | ? MODE_VECTOR_INT | |
5320 | : MODE_VECTOR_FLOAT); | |
5321 | mode != VOIDmode; | |
5322 | mode = GET_MODE_WIDER_MODE (mode)) | |
5323 | if (vecsize == GET_MODE_SIZE (mode) | |
5324 | && nunits == (unsigned HOST_WIDE_INT) GET_MODE_NUNITS (mode)) | |
5325 | { | |
5326 | new_mode = mode; | |
5327 | break; | |
5328 | } | |
5329 | ||
4a5eab38 | 5330 | if (new_mode == VOIDmode) |
349ae713 NB |
5331 | { |
5332 | error ("no vector mode with the size and type specified could be found"); | |
5333 | return NULL_TREE; | |
5334 | } | |
5335 | ||
4a5eab38 | 5336 | new_type = build_vector_type_for_mode (type, new_mode); |
349ae713 NB |
5337 | |
5338 | /* Build back pointers if needed. */ | |
b34417a4 | 5339 | *node = reconstruct_complex_type (*node, new_type); |
349ae713 NB |
5340 | |
5341 | return NULL_TREE; | |
5342 | } | |
5343 | ||
b34c7881 JT |
5344 | /* Handle the "nonnull" attribute. */ |
5345 | static tree | |
35b1a6fa AJ |
5346 | handle_nonnull_attribute (tree *node, tree name ATTRIBUTE_UNUSED, |
5347 | tree args, int flags ATTRIBUTE_UNUSED, | |
a742c759 | 5348 | bool *no_add_attrs) |
b34c7881 JT |
5349 | { |
5350 | tree type = *node; | |
5351 | unsigned HOST_WIDE_INT attr_arg_num; | |
5352 | ||
5353 | /* If no arguments are specified, all pointer arguments should be | |
95bd1dd7 | 5354 | non-null. Verify a full prototype is given so that the arguments |
b34c7881 JT |
5355 | will have the correct types when we actually check them later. */ |
5356 | if (! args) | |
5357 | { | |
5358 | if (! TYPE_ARG_TYPES (type)) | |
5359 | { | |
5360 | error ("nonnull attribute without arguments on a non-prototype"); | |
6de9cd9a | 5361 | *no_add_attrs = true; |
b34c7881 JT |
5362 | } |
5363 | return NULL_TREE; | |
5364 | } | |
5365 | ||
5366 | /* Argument list specified. Verify that each argument number references | |
5367 | a pointer argument. */ | |
5368 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
5369 | { | |
5370 | tree argument; | |
6de9cd9a | 5371 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
b34c7881 JT |
5372 | |
5373 | if (! get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
5374 | { | |
5375 | error ("nonnull argument has invalid operand number (arg %lu)", | |
5376 | (unsigned long) attr_arg_num); | |
5377 | *no_add_attrs = true; | |
5378 | return NULL_TREE; | |
5379 | } | |
5380 | ||
5381 | argument = TYPE_ARG_TYPES (type); | |
5382 | if (argument) | |
5383 | { | |
5384 | for (ck_num = 1; ; ck_num++) | |
5385 | { | |
5386 | if (! argument || ck_num == arg_num) | |
5387 | break; | |
5388 | argument = TREE_CHAIN (argument); | |
5389 | } | |
5390 | ||
6de9cd9a | 5391 | if (! argument |
b34c7881 JT |
5392 | || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
5393 | { | |
5394 | error ("nonnull argument with out-of-range operand number (arg %lu, operand %lu)", | |
5395 | (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
5396 | *no_add_attrs = true; | |
5397 | return NULL_TREE; | |
5398 | } | |
5399 | ||
6de9cd9a | 5400 | if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
b34c7881 JT |
5401 | { |
5402 | error ("nonnull argument references non-pointer operand (arg %lu, operand %lu)", | |
5403 | (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
5404 | *no_add_attrs = true; | |
5405 | return NULL_TREE; | |
5406 | } | |
5407 | } | |
5408 | } | |
5409 | ||
5410 | return NULL_TREE; | |
5411 | } | |
5412 | ||
5413 | /* Check the argument list of a function call for null in argument slots | |
5414 | that are marked as requiring a non-null pointer argument. */ | |
5415 | ||
5416 | static void | |
35b1a6fa | 5417 | check_function_nonnull (tree attrs, tree params) |
b34c7881 JT |
5418 | { |
5419 | tree a, args, param; | |
5420 | int param_num; | |
5421 | ||
5422 | for (a = attrs; a; a = TREE_CHAIN (a)) | |
5423 | { | |
5424 | if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
5425 | { | |
6de9cd9a | 5426 | args = TREE_VALUE (a); |
b34c7881 | 5427 | |
6de9cd9a DN |
5428 | /* Walk the argument list. If we encounter an argument number we |
5429 | should check for non-null, do it. If the attribute has no args, | |
5430 | then every pointer argument is checked (in which case the check | |
b34c7881 | 5431 | for pointer type is done in check_nonnull_arg). */ |
6de9cd9a DN |
5432 | for (param = params, param_num = 1; ; |
5433 | param_num++, param = TREE_CHAIN (param)) | |
5434 | { | |
5435 | if (! param) | |
35b1a6fa | 5436 | break; |
6de9cd9a | 5437 | if (! args || nonnull_check_p (args, param_num)) |
35b1a6fa AJ |
5438 | check_function_arguments_recurse (check_nonnull_arg, NULL, |
5439 | TREE_VALUE (param), | |
5440 | param_num); | |
6de9cd9a | 5441 | } |
b34c7881 JT |
5442 | } |
5443 | } | |
5444 | } | |
5445 | ||
5446 | /* Helper for check_function_nonnull; given a list of operands which | |
5447 | must be non-null in ARGS, determine if operand PARAM_NUM should be | |
5448 | checked. */ | |
5449 | ||
5450 | static bool | |
35b1a6fa | 5451 | nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) |
b34c7881 | 5452 | { |
6de9cd9a | 5453 | unsigned HOST_WIDE_INT arg_num = 0; |
b34c7881 JT |
5454 | |
5455 | for (; args; args = TREE_CHAIN (args)) | |
5456 | { | |
5457 | if (! get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
6de9cd9a | 5458 | abort (); |
b34c7881 JT |
5459 | |
5460 | if (arg_num == param_num) | |
5461 | return true; | |
5462 | } | |
5463 | return false; | |
5464 | } | |
5465 | ||
5466 | /* Check that the function argument PARAM (which is operand number | |
5467 | PARAM_NUM) is non-null. This is called by check_function_nonnull | |
5468 | via check_function_arguments_recurse. */ | |
5469 | ||
5470 | static void | |
35b1a6fa AJ |
5471 | check_nonnull_arg (void *ctx ATTRIBUTE_UNUSED, tree param, |
5472 | unsigned HOST_WIDE_INT param_num) | |
b34c7881 JT |
5473 | { |
5474 | /* Just skip checking the argument if it's not a pointer. This can | |
5475 | happen if the "nonnull" attribute was given without an operand | |
5476 | list (which means to check every pointer argument). */ | |
5477 | ||
5478 | if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
5479 | return; | |
5480 | ||
5481 | if (integer_zerop (param)) | |
5482 | warning ("null argument where non-null required (arg %lu)", | |
6de9cd9a | 5483 | (unsigned long) param_num); |
b34c7881 JT |
5484 | } |
5485 | ||
5486 | /* Helper for nonnull attribute handling; fetch the operand number | |
5487 | from the attribute argument list. */ | |
5488 | ||
5489 | static bool | |
35b1a6fa | 5490 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
b34c7881 JT |
5491 | { |
5492 | /* Strip any conversions from the arg number and verify they | |
5493 | are constants. */ | |
5494 | while (TREE_CODE (arg_num_expr) == NOP_EXPR | |
5495 | || TREE_CODE (arg_num_expr) == CONVERT_EXPR | |
5496 | || TREE_CODE (arg_num_expr) == NON_LVALUE_EXPR) | |
5497 | arg_num_expr = TREE_OPERAND (arg_num_expr, 0); | |
5498 | ||
5499 | if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
5500 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
5501 | return false; | |
5502 | ||
5503 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5504 | return true; | |
5505 | } | |
39f2f3c8 RS |
5506 | |
5507 | /* Handle a "nothrow" attribute; arguments as in | |
5508 | struct attribute_spec.handler. */ | |
5509 | ||
5510 | static tree | |
35b1a6fa | 5511 | handle_nothrow_attribute (tree *node, tree name, tree args ATTRIBUTE_UNUSED, |
a742c759 | 5512 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
39f2f3c8 RS |
5513 | { |
5514 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5515 | TREE_NOTHROW (*node) = 1; | |
5516 | /* ??? TODO: Support types. */ | |
5517 | else | |
5518 | { | |
5519 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5520 | *no_add_attrs = true; | |
5521 | } | |
5522 | ||
5523 | return NULL_TREE; | |
5524 | } | |
0bfa5f65 RH |
5525 | |
5526 | /* Handle a "cleanup" attribute; arguments as in | |
5527 | struct attribute_spec.handler. */ | |
5528 | ||
5529 | static tree | |
35b1a6fa | 5530 | handle_cleanup_attribute (tree *node, tree name, tree args, |
a742c759 | 5531 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) |
0bfa5f65 RH |
5532 | { |
5533 | tree decl = *node; | |
5534 | tree cleanup_id, cleanup_decl; | |
5535 | ||
5536 | /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
5537 | for global destructors in C++. This requires infrastructure that | |
5538 | we don't have generically at the moment. It's also not a feature | |
5539 | we'd be missing too much, since we do have attribute constructor. */ | |
5540 | if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
5541 | { | |
5542 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5543 | *no_add_attrs = true; | |
5544 | return NULL_TREE; | |
5545 | } | |
5546 | ||
5547 | /* Verify that the argument is a function in scope. */ | |
5548 | /* ??? We could support pointers to functions here as well, if | |
5549 | that was considered desirable. */ | |
5550 | cleanup_id = TREE_VALUE (args); | |
5551 | if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
5552 | { | |
5553 | error ("cleanup arg not an identifier"); | |
5554 | *no_add_attrs = true; | |
5555 | return NULL_TREE; | |
5556 | } | |
5557 | cleanup_decl = lookup_name (cleanup_id); | |
5558 | if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) | |
5559 | { | |
5560 | error ("cleanup arg not a function"); | |
5561 | *no_add_attrs = true; | |
5562 | return NULL_TREE; | |
5563 | } | |
5564 | ||
35b1a6fa | 5565 | /* That the function has proper type is checked with the |
0bfa5f65 RH |
5566 | eventual call to build_function_call. */ |
5567 | ||
5568 | return NULL_TREE; | |
5569 | } | |
72954a4f JM |
5570 | |
5571 | /* Handle a "warn_unused_result" attribute. No special handling. */ | |
5572 | ||
5573 | static tree | |
5574 | handle_warn_unused_result_attribute (tree *node, tree name, | |
5575 | tree args ATTRIBUTE_UNUSED, | |
5576 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) | |
5577 | { | |
5578 | /* Ignore the attribute for functions not returning any value. */ | |
5579 | if (VOID_TYPE_P (TREE_TYPE (*node))) | |
5580 | { | |
5581 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5582 | *no_add_attrs = true; | |
5583 | } | |
5584 | ||
5585 | return NULL_TREE; | |
5586 | } | |
b34c7881 JT |
5587 | \f |
5588 | /* Check for valid arguments being passed to a function. */ | |
5589 | void | |
35b1a6fa | 5590 | check_function_arguments (tree attrs, tree params) |
b34c7881 JT |
5591 | { |
5592 | /* Check for null being passed in a pointer argument that must be | |
5593 | non-null. We also need to do this if format checking is enabled. */ | |
5594 | ||
5595 | if (warn_nonnull) | |
5596 | check_function_nonnull (attrs, params); | |
5597 | ||
5598 | /* Check for errors in format strings. */ | |
5599 | ||
5600 | if (warn_format) | |
5601 | check_function_format (NULL, attrs, params); | |
5602 | } | |
5603 | ||
5604 | /* Generic argument checking recursion routine. PARAM is the argument to | |
5605 | be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
5606 | once the argument is resolved. CTX is context for the callback. */ | |
5607 | void | |
35b1a6fa AJ |
5608 | check_function_arguments_recurse (void (*callback) |
5609 | (void *, tree, unsigned HOST_WIDE_INT), | |
5610 | void *ctx, tree param, | |
5611 | unsigned HOST_WIDE_INT param_num) | |
b34c7881 JT |
5612 | { |
5613 | if (TREE_CODE (param) == NOP_EXPR) | |
5614 | { | |
5615 | /* Strip coercion. */ | |
5616 | check_function_arguments_recurse (callback, ctx, | |
6de9cd9a | 5617 | TREE_OPERAND (param, 0), param_num); |
b34c7881 JT |
5618 | return; |
5619 | } | |
5620 | ||
5621 | if (TREE_CODE (param) == CALL_EXPR) | |
5622 | { | |
5623 | tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0))); | |
5624 | tree attrs; | |
5625 | bool found_format_arg = false; | |
5626 | ||
5627 | /* See if this is a call to a known internationalization function | |
5628 | that modifies a format arg. Such a function may have multiple | |
5629 | format_arg attributes (for example, ngettext). */ | |
5630 | ||
5631 | for (attrs = TYPE_ATTRIBUTES (type); | |
5632 | attrs; | |
5633 | attrs = TREE_CHAIN (attrs)) | |
5634 | if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
5635 | { | |
5636 | tree inner_args; | |
5637 | tree format_num_expr; | |
5638 | int format_num; | |
5639 | int i; | |
5640 | ||
5641 | /* Extract the argument number, which was previously checked | |
5642 | to be valid. */ | |
5643 | format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
5644 | while (TREE_CODE (format_num_expr) == NOP_EXPR | |
5645 | || TREE_CODE (format_num_expr) == CONVERT_EXPR | |
5646 | || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR) | |
5647 | format_num_expr = TREE_OPERAND (format_num_expr, 0); | |
5648 | ||
5649 | if (TREE_CODE (format_num_expr) != INTEGER_CST | |
5650 | || TREE_INT_CST_HIGH (format_num_expr) != 0) | |
5651 | abort (); | |
5652 | ||
5653 | format_num = TREE_INT_CST_LOW (format_num_expr); | |
5654 | ||
5655 | for (inner_args = TREE_OPERAND (param, 1), i = 1; | |
5656 | inner_args != 0; | |
5657 | inner_args = TREE_CHAIN (inner_args), i++) | |
5658 | if (i == format_num) | |
5659 | { | |
5660 | check_function_arguments_recurse (callback, ctx, | |
5661 | TREE_VALUE (inner_args), | |
5662 | param_num); | |
5663 | found_format_arg = true; | |
5664 | break; | |
5665 | } | |
5666 | } | |
5667 | ||
5668 | /* If we found a format_arg attribute and did a recursive check, | |
5669 | we are done with checking this argument. Otherwise, we continue | |
5670 | and this will be considered a non-literal. */ | |
5671 | if (found_format_arg) | |
5672 | return; | |
5673 | } | |
5674 | ||
5675 | if (TREE_CODE (param) == COND_EXPR) | |
5676 | { | |
5677 | /* Check both halves of the conditional expression. */ | |
5678 | check_function_arguments_recurse (callback, ctx, | |
6de9cd9a | 5679 | TREE_OPERAND (param, 1), param_num); |
b34c7881 | 5680 | check_function_arguments_recurse (callback, ctx, |
6de9cd9a | 5681 | TREE_OPERAND (param, 2), param_num); |
b34c7881 JT |
5682 | return; |
5683 | } | |
5684 | ||
5685 | (*callback) (ctx, param, param_num); | |
5686 | } | |
e2500fed | 5687 | |
6de9cd9a DN |
5688 | /* C implementation of lang_hooks.tree_inlining.walk_subtrees. Tracks the |
5689 | locus from EXPR_LOCUS and handles DECL_STMT specially. */ | |
5690 | ||
5691 | tree | |
5692 | c_walk_subtrees (tree *tp, int *walk_subtrees_p ATTRIBUTE_UNUSED, | |
5693 | walk_tree_fn func, void *data, void *htab) | |
5694 | { | |
5695 | enum tree_code code = TREE_CODE (*tp); | |
5696 | location_t save_locus; | |
5697 | tree result; | |
5698 | ||
5699 | #define WALK_SUBTREE(NODE) \ | |
5700 | do \ | |
5701 | { \ | |
5702 | result = walk_tree (&(NODE), func, data, htab); \ | |
5703 | if (result) goto out; \ | |
5704 | } \ | |
5705 | while (0) | |
5706 | ||
5707 | if (code != DECL_STMT) | |
5708 | return NULL_TREE; | |
5709 | ||
5710 | /* Set input_location here so we get the right instantiation context | |
5711 | if we call instantiate_decl from inlinable_function_p. */ | |
5712 | save_locus = input_location; | |
5713 | if (EXPR_LOCUS (*tp)) | |
5714 | input_location = *EXPR_LOCUS (*tp); | |
5715 | ||
5716 | /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk | |
5717 | into declarations that are just mentioned, rather than | |
5718 | declared; they don't really belong to this part of the tree. | |
5719 | And, we can see cycles: the initializer for a declaration can | |
5720 | refer to the declaration itself. */ | |
5721 | WALK_SUBTREE (DECL_INITIAL (DECL_STMT_DECL (*tp))); | |
5722 | WALK_SUBTREE (DECL_SIZE (DECL_STMT_DECL (*tp))); | |
5723 | WALK_SUBTREE (DECL_SIZE_UNIT (DECL_STMT_DECL (*tp))); | |
5724 | WALK_SUBTREE (TREE_CHAIN (*tp)); | |
5725 | *walk_subtrees_p = 0; | |
5726 | ||
5727 | /* We didn't find what we were looking for. */ | |
5728 | out: | |
5729 | input_location = save_locus; | |
5730 | return result; | |
5731 | ||
5732 | #undef WALK_SUBTREE | |
5733 | } | |
5734 | ||
5735 | /* C implementation of lang_hooks.tree_inlining.tree_chain_matters_p. | |
5736 | Apart from TREE_LISTs, the only trees whose TREE_CHAIN we care about are | |
5737 | _STMT nodes. */ | |
5738 | ||
5739 | int | |
5740 | c_tree_chain_matters_p (tree t) | |
5741 | { | |
5742 | /* For statements, we also walk the chain so that we cover the | |
5743 | entire statement tree. */ | |
5744 | return STATEMENT_CODE_P (TREE_CODE (t)); | |
5745 | } | |
5746 | ||
d07605f5 AP |
5747 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
5748 | ||
5749 | int | |
5750 | field_decl_cmp (const void *x_p, const void *y_p) | |
5751 | { | |
5752 | const tree *const x = x_p; | |
5753 | const tree *const y = y_p; | |
5754 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
5755 | /* A nontype is "greater" than a type. */ | |
5756 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5757 | if (DECL_NAME (*x) == NULL_TREE) | |
5758 | return -1; | |
5759 | if (DECL_NAME (*y) == NULL_TREE) | |
5760 | return 1; | |
5761 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
5762 | return -1; | |
5763 | return 1; | |
5764 | } | |
5765 | ||
5766 | static struct { | |
5767 | gt_pointer_operator new_value; | |
5768 | void *cookie; | |
5769 | } resort_data; | |
5770 | ||
5771 | /* This routine compares two fields like field_decl_cmp but using the | |
5772 | pointer operator in resort_data. */ | |
5773 | ||
5774 | static int | |
5775 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
5776 | { | |
5777 | const tree *const x = x_p; | |
5778 | const tree *const y = y_p; | |
5779 | ||
5780 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
5781 | /* A nontype is "greater" than a type. */ | |
5782 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5783 | if (DECL_NAME (*x) == NULL_TREE) | |
5784 | return -1; | |
5785 | if (DECL_NAME (*y) == NULL_TREE) | |
5786 | return 1; | |
5787 | { | |
5788 | tree d1 = DECL_NAME (*x); | |
5789 | tree d2 = DECL_NAME (*y); | |
5790 | resort_data.new_value (&d1, resort_data.cookie); | |
5791 | resort_data.new_value (&d2, resort_data.cookie); | |
5792 | if (d1 < d2) | |
5793 | return -1; | |
5794 | } | |
5795 | return 1; | |
5796 | } | |
5797 | ||
5798 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
5799 | ||
5800 | void | |
5801 | resort_sorted_fields (void *obj, | |
6de9cd9a DN |
5802 | void *orig_obj ATTRIBUTE_UNUSED , |
5803 | gt_pointer_operator new_value, | |
5804 | void *cookie) | |
d07605f5 AP |
5805 | { |
5806 | struct sorted_fields_type *sf = obj; | |
5807 | resort_data.new_value = new_value; | |
5808 | resort_data.cookie = cookie; | |
5809 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
6de9cd9a | 5810 | resort_field_decl_cmp); |
d07605f5 AP |
5811 | } |
5812 | ||
084c1779 JH |
5813 | /* Used by estimate_num_insns. Estimate number of instructions seen |
5814 | by given statement. */ | |
5815 | static tree | |
5816 | c_estimate_num_insns_1 (tree *tp, int *walk_subtrees, void *data) | |
5817 | { | |
5818 | int *count = data; | |
5819 | tree x = *tp; | |
5820 | ||
5821 | if (TYPE_P (x) || DECL_P (x)) | |
5822 | { | |
5823 | *walk_subtrees = 0; | |
5824 | return NULL; | |
5825 | } | |
5826 | /* Assume that constants and references counts nothing. These should | |
a98ebe2e | 5827 | be majorized by amount of operations among them we count later |
084c1779 JH |
5828 | and are common target of CSE and similar optimizations. */ |
5829 | if (TREE_CODE_CLASS (TREE_CODE (x)) == 'c' | |
5830 | || TREE_CODE_CLASS (TREE_CODE (x)) == 'r') | |
5831 | return NULL; | |
5832 | switch (TREE_CODE (x)) | |
5833 | { | |
d91edf86 | 5834 | /* Recognize assignments of large structures and constructors of |
084c1779 JH |
5835 | big arrays. */ |
5836 | case MODIFY_EXPR: | |
5837 | case CONSTRUCTOR: | |
5838 | { | |
4b589eab | 5839 | HOST_WIDE_INT size; |
084c1779 | 5840 | |
4b589eab JH |
5841 | size = int_size_in_bytes (TREE_TYPE (x)); |
5842 | ||
5843 | if (size < 0 || size > MOVE_MAX_PIECES * MOVE_RATIO) | |
084c1779 JH |
5844 | *count += 10; |
5845 | else | |
4b589eab | 5846 | *count += ((size + MOVE_MAX_PIECES - 1) / MOVE_MAX_PIECES); |
084c1779 JH |
5847 | } |
5848 | break; | |
3b75d796 JH |
5849 | case CALL_EXPR: |
5850 | { | |
5851 | tree decl = get_callee_fndecl (x); | |
5852 | ||
5853 | if (decl && DECL_BUILT_IN (decl)) | |
5854 | switch (DECL_FUNCTION_CODE (decl)) | |
5855 | { | |
5856 | case BUILT_IN_CONSTANT_P: | |
5857 | *walk_subtrees = 0; | |
5858 | return NULL_TREE; | |
5859 | case BUILT_IN_EXPECT: | |
5860 | return NULL_TREE; | |
5861 | default: | |
5862 | break; | |
5863 | } | |
5864 | *count += 10; | |
5865 | break; | |
5866 | } | |
321440fd | 5867 | /* Few special cases of expensive operations. This is useful |
084c1779 JH |
5868 | to avoid inlining on functions having too many of these. */ |
5869 | case TRUNC_DIV_EXPR: | |
5870 | case CEIL_DIV_EXPR: | |
5871 | case FLOOR_DIV_EXPR: | |
5872 | case ROUND_DIV_EXPR: | |
5873 | case TRUNC_MOD_EXPR: | |
5874 | case CEIL_MOD_EXPR: | |
5875 | case FLOOR_MOD_EXPR: | |
5876 | case ROUND_MOD_EXPR: | |
5877 | case RDIV_EXPR: | |
084c1779 JH |
5878 | *count += 10; |
5879 | break; | |
5880 | /* Various containers that will produce no code themselves. */ | |
5881 | case INIT_EXPR: | |
5882 | case TARGET_EXPR: | |
5883 | case BIND_EXPR: | |
5884 | case BLOCK: | |
5885 | case TREE_LIST: | |
5886 | case TREE_VEC: | |
5887 | case IDENTIFIER_NODE: | |
5888 | case PLACEHOLDER_EXPR: | |
5889 | case WITH_CLEANUP_EXPR: | |
5890 | case CLEANUP_POINT_EXPR: | |
5891 | case NOP_EXPR: | |
5892 | case VIEW_CONVERT_EXPR: | |
5893 | case SAVE_EXPR: | |
5894 | case UNSAVE_EXPR: | |
5895 | case COMPLEX_EXPR: | |
5896 | case REALPART_EXPR: | |
5897 | case IMAGPART_EXPR: | |
5898 | case TRY_CATCH_EXPR: | |
5899 | case TRY_FINALLY_EXPR: | |
5900 | case LABEL_EXPR: | |
5901 | case EXIT_EXPR: | |
5902 | case LABELED_BLOCK_EXPR: | |
5903 | case EXIT_BLOCK_EXPR: | |
084c1779 JH |
5904 | |
5905 | case EXPR_STMT: | |
5906 | case COMPOUND_STMT: | |
5907 | case RETURN_STMT: | |
5908 | case LABEL_STMT: | |
5909 | case SCOPE_STMT: | |
084c1779 JH |
5910 | case CASE_LABEL: |
5911 | case STMT_EXPR: | |
5912 | case CLEANUP_STMT: | |
5913 | ||
5914 | case SIZEOF_EXPR: | |
5915 | case ARROW_EXPR: | |
5916 | case ALIGNOF_EXPR: | |
5917 | break; | |
5918 | case DECL_STMT: | |
5919 | /* Do not account static initializers. */ | |
5920 | if (TREE_STATIC (TREE_OPERAND (x, 0))) | |
5921 | *walk_subtrees = 0; | |
5922 | break; | |
5923 | default: | |
5924 | (*count)++; | |
5925 | } | |
5926 | return NULL; | |
5927 | } | |
5928 | ||
5929 | /* Estimate number of instructions that will be created by expanding the body. */ | |
5930 | int | |
5931 | c_estimate_num_insns (tree decl) | |
5932 | { | |
5933 | int num = 0; | |
5934 | walk_tree_without_duplicates (&DECL_SAVED_TREE (decl), c_estimate_num_insns_1, &num); | |
5935 | return num; | |
5936 | } | |
5937 | ||
4bb8ca28 MM |
5938 | /* Issue the error given by MSGID, indicating that it occurred before |
5939 | TOKEN, which had the associated VALUE. */ | |
5940 | ||
5941 | void | |
5942 | c_parse_error (const char *msgid, enum cpp_ttype token, tree value) | |
5943 | { | |
5944 | const char *string = _(msgid); | |
5945 | ||
5946 | if (token == CPP_EOF) | |
5947 | error ("%s at end of input", string); | |
5948 | else if (token == CPP_CHAR || token == CPP_WCHAR) | |
5949 | { | |
5950 | unsigned int val = TREE_INT_CST_LOW (value); | |
5951 | const char *const ell = (token == CPP_CHAR) ? "" : "L"; | |
5952 | if (val <= UCHAR_MAX && ISGRAPH (val)) | |
5953 | error ("%s before %s'%c'", string, ell, val); | |
5954 | else | |
5955 | error ("%s before %s'\\x%x'", string, ell, val); | |
5956 | } | |
5957 | else if (token == CPP_STRING | |
5958 | || token == CPP_WSTRING) | |
5959 | error ("%s before string constant", string); | |
5960 | else if (token == CPP_NUMBER) | |
5961 | error ("%s before numeric constant", string); | |
5962 | else if (token == CPP_NAME) | |
5963 | error ("%s before \"%s\"", string, IDENTIFIER_POINTER (value)); | |
5964 | else if (token < N_TTYPES) | |
5965 | error ("%s before '%s' token", string, cpp_type2name (token)); | |
5966 | else | |
5967 | error ("%s", string); | |
5968 | } | |
5969 | ||
6de9cd9a DN |
5970 | /* Walk a gimplified function and warn for functions whose return value is |
5971 | ignored and attribute((warn_unused_result)) is set. This is done before | |
5972 | inlining, so we don't have to worry about that. */ | |
5973 | ||
5974 | void | |
5975 | c_warn_unused_result (tree *top_p) | |
5976 | { | |
5977 | tree t = *top_p; | |
5978 | tree_stmt_iterator i; | |
5979 | tree fdecl, ftype; | |
5980 | ||
5981 | switch (TREE_CODE (t)) | |
5982 | { | |
5983 | case STATEMENT_LIST: | |
5984 | for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i)) | |
5985 | c_warn_unused_result (tsi_stmt_ptr (i)); | |
5986 | break; | |
5987 | ||
5988 | case COND_EXPR: | |
5989 | c_warn_unused_result (&COND_EXPR_THEN (t)); | |
5990 | c_warn_unused_result (&COND_EXPR_ELSE (t)); | |
5991 | break; | |
5992 | case BIND_EXPR: | |
5993 | c_warn_unused_result (&BIND_EXPR_BODY (t)); | |
5994 | break; | |
5995 | case TRY_FINALLY_EXPR: | |
5996 | case TRY_CATCH_EXPR: | |
5997 | c_warn_unused_result (&TREE_OPERAND (t, 0)); | |
5998 | c_warn_unused_result (&TREE_OPERAND (t, 1)); | |
5999 | break; | |
6000 | case CATCH_EXPR: | |
6001 | c_warn_unused_result (&CATCH_BODY (t)); | |
6002 | break; | |
6003 | case EH_FILTER_EXPR: | |
6004 | c_warn_unused_result (&EH_FILTER_FAILURE (t)); | |
6005 | break; | |
6006 | ||
6007 | case CALL_EXPR: | |
6008 | /* This is a naked call, as opposed to a CALL_EXPR nested inside | |
6009 | a MODIFY_EXPR. All calls whose value is ignored should be | |
6010 | represented like this. Look for the attribute. */ | |
6011 | fdecl = get_callee_fndecl (t); | |
6012 | if (fdecl) | |
6013 | ftype = TREE_TYPE (fdecl); | |
6014 | else | |
6015 | { | |
6016 | ftype = TREE_TYPE (TREE_OPERAND (t, 0)); | |
6017 | /* Look past pointer-to-function to the function type itself. */ | |
6018 | ftype = TREE_TYPE (ftype); | |
6019 | } | |
6020 | ||
6021 | if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype))) | |
6022 | { | |
6023 | if (fdecl) | |
6024 | warning ("%Hignoring return value of `%D', " | |
6025 | "declared with attribute warn_unused_result", | |
6026 | EXPR_LOCUS (t), fdecl); | |
6027 | else | |
6028 | warning ("%Hignoring return value of function " | |
6029 | "declared with attribute warn_unused_result", | |
6030 | EXPR_LOCUS (t)); | |
6031 | } | |
6032 | break; | |
6033 | ||
6034 | default: | |
6035 | /* Not a container, not a call, or a call whose value is used. */ | |
6036 | break; | |
6037 | } | |
6038 | } | |
6039 | ||
e2500fed | 6040 | #include "gt-c-common.h" |