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b0fc3e72 | 1 | /* Subroutines shared by all languages that are variants of C. |
d513ec2f | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
2d9d8740 | 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
4 | Free Software Foundation, Inc. | |
b0fc3e72 | 5 | |
f12b58b3 | 6 | This file is part of GCC. |
b0fc3e72 | 7 | |
f12b58b3 | 8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 10 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 11 | version. |
b0fc3e72 | 12 | |
f12b58b3 | 13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
b0fc3e72 | 17 | |
18 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
b0fc3e72 | 21 | |
22 | #include "config.h" | |
405711de | 23 | #include "system.h" |
805e22b2 | 24 | #include "coretypes.h" |
25 | #include "tm.h" | |
e48d0f41 | 26 | #include "intl.h" |
b0fc3e72 | 27 | #include "tree.h" |
b0fc3e72 | 28 | #include "flags.h" |
cd03a192 | 29 | #include "output.h" |
a3fa7feb | 30 | #include "c-pragma.h" |
a5b1863e | 31 | #include "rtl.h" |
dc12af01 | 32 | #include "ggc.h" |
573aba85 | 33 | #include "varray.h" |
74647769 | 34 | #include "expr.h" |
e41f0d80 | 35 | #include "c-common.h" |
d8c9779c | 36 | #include "tm_p.h" |
4e91a871 | 37 | #include "obstack.h" |
a654e028 | 38 | #include "cpplib.h" |
8ee295a7 | 39 | #include "target.h" |
96554925 | 40 | #include "langhooks.h" |
f3dde807 | 41 | #include "tree-inline.h" |
7acb29a3 | 42 | #include "c-tree.h" |
69579044 | 43 | #include "toplev.h" |
7f5f3953 | 44 | #include "diagnostic.h" |
4ee9c684 | 45 | #include "tree-iterator.h" |
46 | #include "hashtab.h" | |
b55af61c | 47 | #include "tree-mudflap.h" |
e08bd2f4 | 48 | #include "opts.h" |
5000e21c | 49 | #include "real.h" |
62eec3b4 | 50 | #include "cgraph.h" |
b9fc964a | 51 | #include "target-def.h" |
75a70cf9 | 52 | #include "gimple.h" |
9421ebb9 | 53 | #include "fixed-value.h" |
979d3efc | 54 | #include "libfuncs.h" |
fd6f6435 | 55 | |
90cc7820 | 56 | cpp_reader *parse_in; /* Declared in c-pragma.h. */ |
a654e028 | 57 | |
174fcc61 | 58 | /* We let tm.h override the types used here, to handle trivial differences |
59 | such as the choice of unsigned int or long unsigned int for size_t. | |
60 | When machines start needing nontrivial differences in the size type, | |
61 | it would be best to do something here to figure out automatically | |
62 | from other information what type to use. */ | |
63 | ||
64 | #ifndef SIZE_TYPE | |
65 | #define SIZE_TYPE "long unsigned int" | |
66 | #endif | |
67 | ||
73673831 | 68 | #ifndef PID_TYPE |
69 | #define PID_TYPE "int" | |
70 | #endif | |
71 | ||
924bbf02 | 72 | #ifndef CHAR16_TYPE |
73 | #define CHAR16_TYPE "short unsigned int" | |
74 | #endif | |
75 | ||
76 | #ifndef CHAR32_TYPE | |
77 | #define CHAR32_TYPE "unsigned int" | |
78 | #endif | |
79 | ||
174fcc61 | 80 | #ifndef WCHAR_TYPE |
81 | #define WCHAR_TYPE "int" | |
82 | #endif | |
83 | ||
18ef7ac2 | 84 | /* WCHAR_TYPE gets overridden by -fshort-wchar. */ |
85 | #define MODIFIED_WCHAR_TYPE \ | |
86 | (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE) | |
87 | ||
194c4d9f | 88 | #ifndef PTRDIFF_TYPE |
89 | #define PTRDIFF_TYPE "long int" | |
90 | #endif | |
91 | ||
6bf5ed8d | 92 | #ifndef WINT_TYPE |
93 | #define WINT_TYPE "unsigned int" | |
94 | #endif | |
95 | ||
96 | #ifndef INTMAX_TYPE | |
97 | #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
98 | ? "int" \ | |
99 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
100 | ? "long int" \ | |
101 | : "long long int")) | |
102 | #endif | |
103 | ||
104 | #ifndef UINTMAX_TYPE | |
105 | #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
106 | ? "unsigned int" \ | |
107 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
108 | ? "long unsigned int" \ | |
109 | : "long long unsigned int")) | |
110 | #endif | |
111 | ||
72040e7e | 112 | /* The following symbols are subsumed in the c_global_trees array, and |
44e9fa65 | 113 | listed here individually for documentation purposes. |
72040e7e | 114 | |
115 | INTEGER_TYPE and REAL_TYPE nodes for the standard data types. | |
116 | ||
117 | tree short_integer_type_node; | |
118 | tree long_integer_type_node; | |
119 | tree long_long_integer_type_node; | |
120 | ||
121 | tree short_unsigned_type_node; | |
122 | tree long_unsigned_type_node; | |
123 | tree long_long_unsigned_type_node; | |
124 | ||
3c2239cf | 125 | tree truthvalue_type_node; |
126 | tree truthvalue_false_node; | |
127 | tree truthvalue_true_node; | |
72040e7e | 128 | |
129 | tree ptrdiff_type_node; | |
130 | ||
131 | tree unsigned_char_type_node; | |
132 | tree signed_char_type_node; | |
133 | tree wchar_type_node; | |
134 | tree signed_wchar_type_node; | |
135 | tree unsigned_wchar_type_node; | |
136 | ||
924bbf02 | 137 | tree char16_type_node; |
138 | tree char32_type_node; | |
139 | ||
72040e7e | 140 | tree float_type_node; |
141 | tree double_type_node; | |
142 | tree long_double_type_node; | |
143 | ||
144 | tree complex_integer_type_node; | |
145 | tree complex_float_type_node; | |
146 | tree complex_double_type_node; | |
147 | tree complex_long_double_type_node; | |
148 | ||
c4503c0a | 149 | tree dfloat32_type_node; |
150 | tree dfloat64_type_node; | |
151 | tree_dfloat128_type_node; | |
152 | ||
72040e7e | 153 | tree intQI_type_node; |
154 | tree intHI_type_node; | |
155 | tree intSI_type_node; | |
156 | tree intDI_type_node; | |
157 | tree intTI_type_node; | |
158 | ||
159 | tree unsigned_intQI_type_node; | |
160 | tree unsigned_intHI_type_node; | |
161 | tree unsigned_intSI_type_node; | |
162 | tree unsigned_intDI_type_node; | |
163 | tree unsigned_intTI_type_node; | |
164 | ||
165 | tree widest_integer_literal_type_node; | |
166 | tree widest_unsigned_literal_type_node; | |
167 | ||
168 | Nodes for types `void *' and `const void *'. | |
169 | ||
170 | tree ptr_type_node, const_ptr_type_node; | |
171 | ||
172 | Nodes for types `char *' and `const char *'. | |
173 | ||
174 | tree string_type_node, const_string_type_node; | |
175 | ||
176 | Type `char[SOMENUMBER]'. | |
177 | Used when an array of char is needed and the size is irrelevant. | |
178 | ||
179 | tree char_array_type_node; | |
180 | ||
181 | Type `int[SOMENUMBER]' or something like it. | |
182 | Used when an array of int needed and the size is irrelevant. | |
183 | ||
184 | tree int_array_type_node; | |
185 | ||
186 | Type `wchar_t[SOMENUMBER]' or something like it. | |
187 | Used when a wide string literal is created. | |
188 | ||
189 | tree wchar_array_type_node; | |
190 | ||
924bbf02 | 191 | Type `char16_t[SOMENUMBER]' or something like it. |
192 | Used when a UTF-16 string literal is created. | |
193 | ||
194 | tree char16_array_type_node; | |
195 | ||
196 | Type `char32_t[SOMENUMBER]' or something like it. | |
197 | Used when a UTF-32 string literal is created. | |
198 | ||
199 | tree char32_array_type_node; | |
200 | ||
72040e7e | 201 | Type `int ()' -- used for implicit declaration of functions. |
202 | ||
203 | tree default_function_type; | |
204 | ||
72040e7e | 205 | A VOID_TYPE node, packaged in a TREE_LIST. |
206 | ||
207 | tree void_list_node; | |
208 | ||
734c98be | 209 | The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, |
65b7f83f | 210 | and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ |
211 | VAR_DECLS, but C++ does.) | |
71d9fc9b | 212 | |
65b7f83f | 213 | tree function_name_decl_node; |
734c98be | 214 | tree pretty_function_name_decl_node; |
65b7f83f | 215 | tree c99_function_name_decl_node; |
216 | ||
217 | Stack of nested function name VAR_DECLs. | |
1cae46be | 218 | |
65b7f83f | 219 | tree saved_function_name_decls; |
71d9fc9b | 220 | |
72040e7e | 221 | */ |
222 | ||
223 | tree c_global_trees[CTI_MAX]; | |
573aba85 | 224 | \f |
574a6990 | 225 | /* Switches common to the C front ends. */ |
226 | ||
f0b5f617 | 227 | /* Nonzero if preprocessing only. */ |
f7070933 | 228 | |
ffd56b21 | 229 | int flag_preprocess_only; |
230 | ||
f7070933 | 231 | /* Nonzero means don't output line number information. */ |
232 | ||
233 | char flag_no_line_commands; | |
234 | ||
235 | /* Nonzero causes -E output not to be done, but directives such as | |
236 | #define that have side effects are still obeyed. */ | |
237 | ||
238 | char flag_no_output; | |
239 | ||
240 | /* Nonzero means dump macros in some fashion. */ | |
241 | ||
242 | char flag_dump_macros; | |
243 | ||
244 | /* Nonzero means pass #include lines through to the output. */ | |
245 | ||
246 | char flag_dump_includes; | |
247 | ||
d718b525 | 248 | /* Nonzero means process PCH files while preprocessing. */ |
249 | ||
250 | bool flag_pch_preprocess; | |
251 | ||
573aba85 | 252 | /* The file name to which we should write a precompiled header, or |
253 | NULL if no header will be written in this compile. */ | |
254 | ||
255 | const char *pch_file; | |
256 | ||
1ed9d5f5 | 257 | /* Nonzero if an ISO standard was selected. It rejects macros in the |
258 | user's namespace. */ | |
259 | int flag_iso; | |
260 | ||
261 | /* Nonzero if -undef was given. It suppresses target built-in macros | |
262 | and assertions. */ | |
263 | int flag_undef; | |
264 | ||
0270ae90 | 265 | /* Nonzero means don't recognize the non-ANSI builtin functions. */ |
266 | ||
267 | int flag_no_builtin; | |
268 | ||
269 | /* Nonzero means don't recognize the non-ANSI builtin functions. | |
270 | -ansi sets this. */ | |
271 | ||
272 | int flag_no_nonansi_builtin; | |
273 | ||
174fcc61 | 274 | /* Nonzero means give `double' the same size as `float'. */ |
275 | ||
276 | int flag_short_double; | |
277 | ||
278 | /* Nonzero means give `wchar_t' the same size as `short'. */ | |
279 | ||
280 | int flag_short_wchar; | |
281 | ||
546c4794 | 282 | /* Nonzero means allow implicit conversions between vectors with |
283 | differing numbers of subparts and/or differing element types. */ | |
284 | int flag_lax_vector_conversions; | |
285 | ||
07ebd091 | 286 | /* Nonzero means allow Microsoft extensions without warnings or errors. */ |
287 | int flag_ms_extensions; | |
288 | ||
574a6990 | 289 | /* Nonzero means don't recognize the keyword `asm'. */ |
290 | ||
291 | int flag_no_asm; | |
292 | ||
574a6990 | 293 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
294 | ||
295 | int flag_signed_bitfields = 1; | |
574a6990 | 296 | |
1cae46be | 297 | /* Warn about #pragma directives that are not recognized. */ |
574a6990 | 298 | |
1cae46be | 299 | int warn_unknown_pragmas; /* Tri state variable. */ |
574a6990 | 300 | |
574a6990 | 301 | /* Warn about format/argument anomalies in calls to formatted I/O functions |
302 | (*printf, *scanf, strftime, strfmon, etc.). */ | |
303 | ||
304 | int warn_format; | |
305 | ||
ae84079f | 306 | /* Warn about using __null (as NULL in C++) as sentinel. For code compiled |
307 | with GCC this doesn't matter as __null is guaranteed to have the right | |
308 | size. */ | |
309 | ||
310 | int warn_strict_null_sentinel; | |
311 | ||
c17b85ea | 312 | /* Zero means that faster, ...NonNil variants of objc_msgSend... |
313 | calls will be used in ObjC; passing nil receivers to such calls | |
314 | will most likely result in crashes. */ | |
315 | int flag_nil_receivers = 1; | |
316 | ||
c17b85ea | 317 | /* Nonzero means that code generation will be altered to support |
318 | "zero-link" execution. This currently affects ObjC only, but may | |
319 | affect other languages in the future. */ | |
320 | int flag_zero_link = 0; | |
321 | ||
322 | /* Nonzero means emit an '__OBJC, __image_info' for the current translation | |
323 | unit. It will inform the ObjC runtime that class definition(s) herein | |
324 | contained are to replace one(s) previously loaded. */ | |
325 | int flag_replace_objc_classes = 0; | |
b27ac6b5 | 326 | |
574a6990 | 327 | /* C/ObjC language option variables. */ |
328 | ||
329 | ||
574a6990 | 330 | /* Nonzero means allow type mismatches in conditional expressions; |
331 | just make their values `void'. */ | |
332 | ||
333 | int flag_cond_mismatch; | |
334 | ||
335 | /* Nonzero means enable C89 Amendment 1 features. */ | |
336 | ||
337 | int flag_isoc94; | |
338 | ||
339 | /* Nonzero means use the ISO C99 dialect of C. */ | |
340 | ||
341 | int flag_isoc99; | |
342 | ||
8b332087 | 343 | /* Nonzero means that we have builtin functions, and main is an int. */ |
574a6990 | 344 | |
345 | int flag_hosted = 1; | |
346 | ||
574a6990 | 347 | |
348 | /* ObjC language option variables. */ | |
349 | ||
350 | ||
351 | /* Open and close the file for outputting class declarations, if | |
352 | requested (ObjC). */ | |
353 | ||
354 | int flag_gen_declaration; | |
355 | ||
574a6990 | 356 | /* Tells the compiler that this is a special run. Do not perform any |
357 | compiling, instead we are to test some platform dependent features | |
358 | and output a C header file with appropriate definitions. */ | |
359 | ||
360 | int print_struct_values; | |
361 | ||
f0b5f617 | 362 | /* Tells the compiler what is the constant string class for ObjC. */ |
574a6990 | 363 | |
364 | const char *constant_string_class_name; | |
365 | ||
574a6990 | 366 | |
367 | /* C++ language option variables. */ | |
368 | ||
369 | ||
370 | /* Nonzero means don't recognize any extension keywords. */ | |
371 | ||
372 | int flag_no_gnu_keywords; | |
373 | ||
374 | /* Nonzero means do emit exported implementations of functions even if | |
375 | they can be inlined. */ | |
376 | ||
377 | int flag_implement_inlines = 1; | |
378 | ||
574a6990 | 379 | /* Nonzero means that implicit instantiations will be emitted if needed. */ |
380 | ||
381 | int flag_implicit_templates = 1; | |
382 | ||
383 | /* Nonzero means that implicit instantiations of inline templates will be | |
384 | emitted if needed, even if instantiations of non-inline templates | |
385 | aren't. */ | |
386 | ||
387 | int flag_implicit_inline_templates = 1; | |
388 | ||
389 | /* Nonzero means generate separate instantiation control files and | |
390 | juggle them at link time. */ | |
391 | ||
392 | int flag_use_repository; | |
393 | ||
394 | /* Nonzero if we want to issue diagnostics that the standard says are not | |
395 | required. */ | |
396 | ||
397 | int flag_optional_diags = 1; | |
398 | ||
399 | /* Nonzero means we should attempt to elide constructors when possible. */ | |
400 | ||
401 | int flag_elide_constructors = 1; | |
402 | ||
403 | /* Nonzero means that member functions defined in class scope are | |
404 | inline by default. */ | |
405 | ||
406 | int flag_default_inline = 1; | |
407 | ||
408 | /* Controls whether compiler generates 'type descriptor' that give | |
409 | run-time type information. */ | |
410 | ||
411 | int flag_rtti = 1; | |
412 | ||
413 | /* Nonzero if we want to conserve space in the .o files. We do this | |
414 | by putting uninitialized data and runtime initialized data into | |
415 | .common instead of .data at the expense of not flagging multiple | |
416 | definitions. */ | |
417 | ||
418 | int flag_conserve_space; | |
419 | ||
420 | /* Nonzero if we want to obey access control semantics. */ | |
421 | ||
422 | int flag_access_control = 1; | |
423 | ||
424 | /* Nonzero if we want to check the return value of new and avoid calling | |
425 | constructors if it is a null pointer. */ | |
426 | ||
427 | int flag_check_new; | |
428 | ||
6dcdb5de | 429 | /* The C++ dialect being used. C++98 is the default. */ |
0fe6eeac | 430 | |
6dcdb5de | 431 | enum cxx_dialect cxx_dialect = cxx98; |
0fe6eeac | 432 | |
574a6990 | 433 | /* Nonzero if we want the new ISO rules for pushing a new scope for `for' |
434 | initialization variables. | |
435 | 0: Old rules, set by -fno-for-scope. | |
436 | 2: New ISO rules, set by -ffor-scope. | |
437 | 1: Try to implement new ISO rules, but with backup compatibility | |
438 | (and warnings). This is the default, for now. */ | |
439 | ||
440 | int flag_new_for_scope = 1; | |
441 | ||
442 | /* Nonzero if we want to emit defined symbols with common-like linkage as | |
443 | weak symbols where possible, in order to conform to C++ semantics. | |
444 | Otherwise, emit them as local symbols. */ | |
445 | ||
446 | int flag_weak = 1; | |
447 | ||
e7aa92b2 | 448 | /* 0 means we want the preprocessor to not emit line directives for |
449 | the current working directory. 1 means we want it to do it. -1 | |
450 | means we should decide depending on whether debugging information | |
451 | is being emitted or not. */ | |
452 | ||
453 | int flag_working_directory = -1; | |
454 | ||
574a6990 | 455 | /* Nonzero to use __cxa_atexit, rather than atexit, to register |
3bf418bd | 456 | destructors for local statics and global objects. '2' means it has been |
457 | set nonzero as a default, not by a command-line flag. */ | |
574a6990 | 458 | |
459 | int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT; | |
460 | ||
3bf418bd | 461 | /* Nonzero to use __cxa_get_exception_ptr in C++ exception-handling |
462 | code. '2' means it has not been set explicitly on the command line. */ | |
463 | ||
464 | int flag_use_cxa_get_exception_ptr = 2; | |
465 | ||
574a6990 | 466 | /* Nonzero means to implement standard semantics for exception |
467 | specifications, calling unexpected if an exception is thrown that | |
468 | doesn't match the specification. Zero means to treat them as | |
469 | assertions and optimize accordingly, but not check them. */ | |
470 | ||
471 | int flag_enforce_eh_specs = 1; | |
472 | ||
4813f5af | 473 | /* Nonzero means to generate thread-safe code for initializing local |
474 | statics. */ | |
475 | ||
476 | int flag_threadsafe_statics = 1; | |
477 | ||
574a6990 | 478 | /* Nonzero means warn about implicit declarations. */ |
479 | ||
480 | int warn_implicit = 1; | |
481 | ||
574a6990 | 482 | /* Maximum template instantiation depth. This limit is rather |
483 | arbitrary, but it exists to limit the time it takes to notice | |
484 | infinite template instantiations. */ | |
485 | ||
486 | int max_tinst_depth = 500; | |
487 | ||
488 | ||
489 | ||
988fc1d1 | 490 | /* The elements of `ridpointers' are identifier nodes for the reserved |
491 | type names and storage classes. It is indexed by a RID_... value. */ | |
492 | tree *ridpointers; | |
493 | ||
1cae46be | 494 | tree (*make_fname_decl) (tree, int); |
9e5a737d | 495 | |
e78703c1 | 496 | /* Nonzero means the expression being parsed will never be evaluated. |
497 | This is a count, since unevaluated expressions can nest. */ | |
498 | int skip_evaluation; | |
499 | ||
7f5f3953 | 500 | /* Whether lexing has been completed, so subsequent preprocessor |
501 | errors should use the compiler's input_location. */ | |
502 | bool done_lexing = false; | |
503 | ||
2c0e001b | 504 | /* Information about how a function name is generated. */ |
65b7f83f | 505 | struct fname_var_t |
506 | { | |
e99c3a1d | 507 | tree *const decl; /* pointer to the VAR_DECL. */ |
508 | const unsigned rid; /* RID number for the identifier. */ | |
509 | const int pretty; /* How pretty is it? */ | |
65b7f83f | 510 | }; |
511 | ||
2c0e001b | 512 | /* The three ways of getting then name of the current function. */ |
65b7f83f | 513 | |
514 | const struct fname_var_t fname_vars[] = | |
515 | { | |
2c0e001b | 516 | /* C99 compliant __func__, must be first. */ |
65b7f83f | 517 | {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, |
2c0e001b | 518 | /* GCC __FUNCTION__ compliant. */ |
65b7f83f | 519 | {&function_name_decl_node, RID_FUNCTION_NAME, 0}, |
2c0e001b | 520 | /* GCC __PRETTY_FUNCTION__ compliant. */ |
65b7f83f | 521 | {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, |
522 | {NULL, 0, 0}, | |
523 | }; | |
524 | ||
a75b1c71 | 525 | static tree c_fully_fold_internal (tree expr, bool, bool *, bool *); |
2ca392fd | 526 | static tree check_case_value (tree); |
527 | static bool check_case_bounds (tree, tree, tree *, tree *); | |
be43ff5a | 528 | |
1cae46be | 529 | static tree handle_packed_attribute (tree *, tree, tree, int, bool *); |
530 | static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
531 | static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
532 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
5de92639 | 533 | static tree handle_hot_attribute (tree *, tree, tree, int, bool *); |
534 | static tree handle_cold_attribute (tree *, tree, tree, int, bool *); | |
1cae46be | 535 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); |
536 | static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
537 | bool *); | |
1b16fc45 | 538 | static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *); |
539 | static tree handle_artificial_attribute (tree *, tree, tree, int, bool *); | |
0cdd9887 | 540 | static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); |
10fc867f | 541 | static tree handle_error_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 542 | static tree handle_used_attribute (tree *, tree, tree, int, bool *); |
543 | static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
62eec3b4 | 544 | static tree handle_externally_visible_attribute (tree *, tree, tree, int, |
545 | bool *); | |
1cae46be | 546 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); |
547 | static tree handle_transparent_union_attribute (tree *, tree, tree, | |
548 | int, bool *); | |
549 | static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
550 | static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
551 | static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
552 | static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
553 | static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
554 | static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
555 | static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
f4a30bd7 | 556 | static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; |
1cae46be | 557 | static tree handle_visibility_attribute (tree *, tree, tree, int, |
558 | bool *); | |
559 | static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
560 | bool *); | |
561 | static tree handle_no_instrument_function_attribute (tree *, tree, | |
562 | tree, int, bool *); | |
563 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
26d1c5ff | 564 | static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 565 | static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, |
566 | bool *); | |
567 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
fc09b200 | 568 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 569 | static tree handle_deprecated_attribute (tree *, tree, tree, int, |
570 | bool *); | |
571 | static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
572 | bool *); | |
573 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
574 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
575 | static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
8a8cdb8d | 576 | static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, |
577 | bool *); | |
bf6c8de0 | 578 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); |
b5c26b42 | 579 | static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); |
4a29c97c | 580 | static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *); |
24470055 | 581 | static tree handle_target_attribute (tree *, tree, tree, int, bool *); |
46f8e3b0 | 582 | static tree handle_optimize_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 583 | |
d01f58f9 | 584 | static void check_function_nonnull (tree, int, tree *); |
1cae46be | 585 | static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); |
586 | static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
587 | static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
860251be | 588 | static int resort_field_decl_cmp (const void *, const void *); |
dbf6c367 | 589 | |
5c6e5756 | 590 | /* Reserved words. The third field is a mask: keywords are disabled |
591 | if they match the mask. | |
592 | ||
593 | Masks for languages: | |
594 | C --std=c89: D_C99 | D_CXXONLY | D_OBJC | D_CXX_OBJC | |
595 | C --std=c99: D_CXXONLY | D_OBJC | |
596 | ObjC is like C except that D_OBJC and D_CXX_OBJC are not set | |
597 | C++ --std=c98: D_CONLY | D_CXXOX | D_OBJC | |
598 | C++ --std=c0x: D_CONLY | D_OBJC | |
599 | ObjC++ is like C++ except that D_OBJC is not set | |
600 | ||
601 | If -fno-asm is used, D_ASM is added to the mask. If | |
602 | -fno-gnu-keywords is used, D_EXT is added. If -fno-asm and C in | |
603 | C89 mode, D_EXT89 is added for both -fno-asm and -fno-gnu-keywords. | |
51030405 | 604 | In C with -Wc++-compat, we warn if D_CXXWARN is set. */ |
5c6e5756 | 605 | |
606 | const struct c_common_resword c_common_reswords[] = | |
607 | { | |
608 | { "_Bool", RID_BOOL, D_CONLY }, | |
609 | { "_Complex", RID_COMPLEX, 0 }, | |
610 | { "_Decimal32", RID_DFLOAT32, D_CONLY | D_EXT }, | |
611 | { "_Decimal64", RID_DFLOAT64, D_CONLY | D_EXT }, | |
612 | { "_Decimal128", RID_DFLOAT128, D_CONLY | D_EXT }, | |
613 | { "_Fract", RID_FRACT, D_CONLY | D_EXT }, | |
614 | { "_Accum", RID_ACCUM, D_CONLY | D_EXT }, | |
615 | { "_Sat", RID_SAT, D_CONLY | D_EXT }, | |
616 | { "__FUNCTION__", RID_FUNCTION_NAME, 0 }, | |
617 | { "__PRETTY_FUNCTION__", RID_PRETTY_FUNCTION_NAME, 0 }, | |
618 | { "__alignof", RID_ALIGNOF, 0 }, | |
619 | { "__alignof__", RID_ALIGNOF, 0 }, | |
620 | { "__asm", RID_ASM, 0 }, | |
621 | { "__asm__", RID_ASM, 0 }, | |
622 | { "__attribute", RID_ATTRIBUTE, 0 }, | |
623 | { "__attribute__", RID_ATTRIBUTE, 0 }, | |
624 | { "__builtin_choose_expr", RID_CHOOSE_EXPR, D_CONLY }, | |
625 | { "__builtin_offsetof", RID_OFFSETOF, 0 }, | |
626 | { "__builtin_types_compatible_p", RID_TYPES_COMPATIBLE_P, D_CONLY }, | |
627 | { "__builtin_va_arg", RID_VA_ARG, 0 }, | |
628 | { "__complex", RID_COMPLEX, 0 }, | |
629 | { "__complex__", RID_COMPLEX, 0 }, | |
630 | { "__const", RID_CONST, 0 }, | |
631 | { "__const__", RID_CONST, 0 }, | |
632 | { "__decltype", RID_DECLTYPE, D_CXXONLY }, | |
633 | { "__extension__", RID_EXTENSION, 0 }, | |
634 | { "__func__", RID_C99_FUNCTION_NAME, 0 }, | |
635 | { "__has_nothrow_assign", RID_HAS_NOTHROW_ASSIGN, D_CXXONLY }, | |
636 | { "__has_nothrow_constructor", RID_HAS_NOTHROW_CONSTRUCTOR, D_CXXONLY }, | |
637 | { "__has_nothrow_copy", RID_HAS_NOTHROW_COPY, D_CXXONLY }, | |
638 | { "__has_trivial_assign", RID_HAS_TRIVIAL_ASSIGN, D_CXXONLY }, | |
639 | { "__has_trivial_constructor", RID_HAS_TRIVIAL_CONSTRUCTOR, D_CXXONLY }, | |
640 | { "__has_trivial_copy", RID_HAS_TRIVIAL_COPY, D_CXXONLY }, | |
641 | { "__has_trivial_destructor", RID_HAS_TRIVIAL_DESTRUCTOR, D_CXXONLY }, | |
642 | { "__has_virtual_destructor", RID_HAS_VIRTUAL_DESTRUCTOR, D_CXXONLY }, | |
643 | { "__is_abstract", RID_IS_ABSTRACT, D_CXXONLY }, | |
644 | { "__is_base_of", RID_IS_BASE_OF, D_CXXONLY }, | |
645 | { "__is_class", RID_IS_CLASS, D_CXXONLY }, | |
646 | { "__is_convertible_to", RID_IS_CONVERTIBLE_TO, D_CXXONLY }, | |
647 | { "__is_empty", RID_IS_EMPTY, D_CXXONLY }, | |
648 | { "__is_enum", RID_IS_ENUM, D_CXXONLY }, | |
649 | { "__is_pod", RID_IS_POD, D_CXXONLY }, | |
650 | { "__is_polymorphic", RID_IS_POLYMORPHIC, D_CXXONLY }, | |
651 | { "__is_union", RID_IS_UNION, D_CXXONLY }, | |
652 | { "__imag", RID_IMAGPART, 0 }, | |
653 | { "__imag__", RID_IMAGPART, 0 }, | |
654 | { "__inline", RID_INLINE, 0 }, | |
655 | { "__inline__", RID_INLINE, 0 }, | |
656 | { "__label__", RID_LABEL, 0 }, | |
657 | { "__null", RID_NULL, 0 }, | |
658 | { "__real", RID_REALPART, 0 }, | |
659 | { "__real__", RID_REALPART, 0 }, | |
660 | { "__restrict", RID_RESTRICT, 0 }, | |
661 | { "__restrict__", RID_RESTRICT, 0 }, | |
662 | { "__signed", RID_SIGNED, 0 }, | |
663 | { "__signed__", RID_SIGNED, 0 }, | |
664 | { "__thread", RID_THREAD, 0 }, | |
665 | { "__typeof", RID_TYPEOF, 0 }, | |
666 | { "__typeof__", RID_TYPEOF, 0 }, | |
667 | { "__volatile", RID_VOLATILE, 0 }, | |
668 | { "__volatile__", RID_VOLATILE, 0 }, | |
669 | { "asm", RID_ASM, D_ASM }, | |
670 | { "auto", RID_AUTO, 0 }, | |
dbd982c9 | 671 | { "bool", RID_BOOL, D_CXXONLY | D_CXXWARN }, |
5c6e5756 | 672 | { "break", RID_BREAK, 0 }, |
673 | { "case", RID_CASE, 0 }, | |
51030405 | 674 | { "catch", RID_CATCH, D_CXX_OBJC | D_CXXWARN }, |
5c6e5756 | 675 | { "char", RID_CHAR, 0 }, |
51030405 | 676 | { "char16_t", RID_CHAR16, D_CXXONLY | D_CXX0X | D_CXXWARN }, |
677 | { "char32_t", RID_CHAR32, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
678 | { "class", RID_CLASS, D_CXX_OBJC | D_CXXWARN }, | |
5c6e5756 | 679 | { "const", RID_CONST, 0 }, |
680 | { "const_cast", RID_CONSTCAST, D_CXXONLY | D_CXXWARN }, | |
681 | { "continue", RID_CONTINUE, 0 }, | |
51030405 | 682 | { "decltype", RID_DECLTYPE, D_CXXONLY | D_CXX0X | D_CXXWARN }, |
5c6e5756 | 683 | { "default", RID_DEFAULT, 0 }, |
51030405 | 684 | { "delete", RID_DELETE, D_CXXONLY | D_CXXWARN }, |
5c6e5756 | 685 | { "do", RID_DO, 0 }, |
686 | { "double", RID_DOUBLE, 0 }, | |
687 | { "dynamic_cast", RID_DYNCAST, D_CXXONLY | D_CXXWARN }, | |
688 | { "else", RID_ELSE, 0 }, | |
689 | { "enum", RID_ENUM, 0 }, | |
51030405 | 690 | { "explicit", RID_EXPLICIT, D_CXXONLY | D_CXXWARN }, |
691 | { "export", RID_EXPORT, D_CXXONLY | D_CXXWARN }, | |
5c6e5756 | 692 | { "extern", RID_EXTERN, 0 }, |
51030405 | 693 | { "false", RID_FALSE, D_CXXONLY | D_CXXWARN }, |
5c6e5756 | 694 | { "float", RID_FLOAT, 0 }, |
695 | { "for", RID_FOR, 0 }, | |
51030405 | 696 | { "friend", RID_FRIEND, D_CXXONLY | D_CXXWARN }, |
5c6e5756 | 697 | { "goto", RID_GOTO, 0 }, |
698 | { "if", RID_IF, 0 }, | |
699 | { "inline", RID_INLINE, D_EXT89 }, | |
700 | { "int", RID_INT, 0 }, | |
701 | { "long", RID_LONG, 0 }, | |
702 | { "mutable", RID_MUTABLE, D_CXXONLY | D_CXXWARN }, | |
51030405 | 703 | { "namespace", RID_NAMESPACE, D_CXXONLY | D_CXXWARN }, |
704 | { "new", RID_NEW, D_CXXONLY | D_CXXWARN }, | |
705 | { "operator", RID_OPERATOR, D_CXXONLY | D_CXXWARN }, | |
706 | { "private", RID_PRIVATE, D_CXX_OBJC | D_CXXWARN }, | |
707 | { "protected", RID_PROTECTED, D_CXX_OBJC | D_CXXWARN }, | |
708 | { "public", RID_PUBLIC, D_CXX_OBJC | D_CXXWARN }, | |
5c6e5756 | 709 | { "register", RID_REGISTER, 0 }, |
710 | { "reinterpret_cast", RID_REINTCAST, D_CXXONLY | D_CXXWARN }, | |
711 | { "restrict", RID_RESTRICT, D_CONLY | D_C99 }, | |
712 | { "return", RID_RETURN, 0 }, | |
713 | { "short", RID_SHORT, 0 }, | |
714 | { "signed", RID_SIGNED, 0 }, | |
715 | { "sizeof", RID_SIZEOF, 0 }, | |
716 | { "static", RID_STATIC, 0 }, | |
717 | { "static_assert", RID_STATIC_ASSERT, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
718 | { "static_cast", RID_STATCAST, D_CXXONLY | D_CXXWARN }, | |
719 | { "struct", RID_STRUCT, 0 }, | |
720 | { "switch", RID_SWITCH, 0 }, | |
51030405 | 721 | { "template", RID_TEMPLATE, D_CXXONLY | D_CXXWARN }, |
722 | { "this", RID_THIS, D_CXXONLY | D_CXXWARN }, | |
723 | { "throw", RID_THROW, D_CXX_OBJC | D_CXXWARN }, | |
724 | { "true", RID_TRUE, D_CXXONLY | D_CXXWARN }, | |
725 | { "try", RID_TRY, D_CXX_OBJC | D_CXXWARN }, | |
5c6e5756 | 726 | { "typedef", RID_TYPEDEF, 0 }, |
51030405 | 727 | { "typename", RID_TYPENAME, D_CXXONLY | D_CXXWARN }, |
728 | { "typeid", RID_TYPEID, D_CXXONLY | D_CXXWARN }, | |
5c6e5756 | 729 | { "typeof", RID_TYPEOF, D_ASM | D_EXT }, |
730 | { "union", RID_UNION, 0 }, | |
731 | { "unsigned", RID_UNSIGNED, 0 }, | |
51030405 | 732 | { "using", RID_USING, D_CXXONLY | D_CXXWARN }, |
733 | { "virtual", RID_VIRTUAL, D_CXXONLY | D_CXXWARN }, | |
5c6e5756 | 734 | { "void", RID_VOID, 0 }, |
735 | { "volatile", RID_VOLATILE, 0 }, | |
736 | { "wchar_t", RID_WCHAR, D_CXXONLY }, | |
737 | { "while", RID_WHILE, 0 }, | |
738 | /* These Objective-C keywords are recognized only immediately after | |
739 | an '@'. */ | |
740 | { "compatibility_alias", RID_AT_ALIAS, D_OBJC }, | |
741 | { "defs", RID_AT_DEFS, D_OBJC }, | |
742 | { "encode", RID_AT_ENCODE, D_OBJC }, | |
743 | { "end", RID_AT_END, D_OBJC }, | |
744 | { "implementation", RID_AT_IMPLEMENTATION, D_OBJC }, | |
745 | { "interface", RID_AT_INTERFACE, D_OBJC }, | |
746 | { "protocol", RID_AT_PROTOCOL, D_OBJC }, | |
747 | { "selector", RID_AT_SELECTOR, D_OBJC }, | |
748 | { "finally", RID_AT_FINALLY, D_OBJC }, | |
749 | { "synchronized", RID_AT_SYNCHRONIZED, D_OBJC }, | |
750 | /* These are recognized only in protocol-qualifier context | |
751 | (see above) */ | |
752 | { "bycopy", RID_BYCOPY, D_OBJC }, | |
753 | { "byref", RID_BYREF, D_OBJC }, | |
754 | { "in", RID_IN, D_OBJC }, | |
755 | { "inout", RID_INOUT, D_OBJC }, | |
756 | { "oneway", RID_ONEWAY, D_OBJC }, | |
757 | { "out", RID_OUT, D_OBJC }, | |
758 | }; | |
759 | ||
760 | const unsigned int num_c_common_reswords = | |
761 | sizeof c_common_reswords / sizeof (struct c_common_resword); | |
762 | ||
f8e93a2e | 763 | /* Table of machine-independent attributes common to all C-like languages. */ |
764 | const struct attribute_spec c_common_attribute_table[] = | |
765 | { | |
766 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
767 | { "packed", 0, 0, false, false, false, | |
1cae46be | 768 | handle_packed_attribute }, |
f8e93a2e | 769 | { "nocommon", 0, 0, true, false, false, |
770 | handle_nocommon_attribute }, | |
771 | { "common", 0, 0, true, false, false, | |
772 | handle_common_attribute }, | |
773 | /* FIXME: logically, noreturn attributes should be listed as | |
774 | "false, true, true" and apply to function types. But implementing this | |
775 | would require all the places in the compiler that use TREE_THIS_VOLATILE | |
776 | on a decl to identify non-returning functions to be located and fixed | |
777 | to check the function type instead. */ | |
778 | { "noreturn", 0, 0, true, false, false, | |
779 | handle_noreturn_attribute }, | |
780 | { "volatile", 0, 0, true, false, false, | |
781 | handle_noreturn_attribute }, | |
782 | { "noinline", 0, 0, true, false, false, | |
783 | handle_noinline_attribute }, | |
784 | { "always_inline", 0, 0, true, false, false, | |
785 | handle_always_inline_attribute }, | |
541e4101 | 786 | { "gnu_inline", 0, 0, true, false, false, |
787 | handle_gnu_inline_attribute }, | |
1b16fc45 | 788 | { "artificial", 0, 0, true, false, false, |
789 | handle_artificial_attribute }, | |
0cdd9887 | 790 | { "flatten", 0, 0, true, false, false, |
a0c938f0 | 791 | handle_flatten_attribute }, |
f8e93a2e | 792 | { "used", 0, 0, true, false, false, |
793 | handle_used_attribute }, | |
794 | { "unused", 0, 0, false, false, false, | |
795 | handle_unused_attribute }, | |
62eec3b4 | 796 | { "externally_visible", 0, 0, true, false, false, |
797 | handle_externally_visible_attribute }, | |
f8e93a2e | 798 | /* The same comments as for noreturn attributes apply to const ones. */ |
799 | { "const", 0, 0, true, false, false, | |
800 | handle_const_attribute }, | |
801 | { "transparent_union", 0, 0, false, false, false, | |
802 | handle_transparent_union_attribute }, | |
9af7fd5b | 803 | { "constructor", 0, 1, true, false, false, |
f8e93a2e | 804 | handle_constructor_attribute }, |
9af7fd5b | 805 | { "destructor", 0, 1, true, false, false, |
f8e93a2e | 806 | handle_destructor_attribute }, |
807 | { "mode", 1, 1, false, true, false, | |
808 | handle_mode_attribute }, | |
809 | { "section", 1, 1, true, false, false, | |
810 | handle_section_attribute }, | |
811 | { "aligned", 0, 1, false, false, false, | |
812 | handle_aligned_attribute }, | |
813 | { "weak", 0, 0, true, false, false, | |
814 | handle_weak_attribute }, | |
815 | { "alias", 1, 1, true, false, false, | |
816 | handle_alias_attribute }, | |
f4a30bd7 | 817 | { "weakref", 0, 1, true, false, false, |
818 | handle_weakref_attribute }, | |
f8e93a2e | 819 | { "no_instrument_function", 0, 0, true, false, false, |
820 | handle_no_instrument_function_attribute }, | |
821 | { "malloc", 0, 0, true, false, false, | |
822 | handle_malloc_attribute }, | |
26d1c5ff | 823 | { "returns_twice", 0, 0, true, false, false, |
824 | handle_returns_twice_attribute }, | |
f8e93a2e | 825 | { "no_stack_limit", 0, 0, true, false, false, |
826 | handle_no_limit_stack_attribute }, | |
827 | { "pure", 0, 0, true, false, false, | |
828 | handle_pure_attribute }, | |
fc09b200 | 829 | /* For internal use (marking of builtins) only. The name contains space |
830 | to prevent its usage in source code. */ | |
831 | { "no vops", 0, 0, true, false, false, | |
832 | handle_novops_attribute }, | |
f8e93a2e | 833 | { "deprecated", 0, 0, false, false, false, |
834 | handle_deprecated_attribute }, | |
835 | { "vector_size", 1, 1, false, true, false, | |
836 | handle_vector_size_attribute }, | |
b212f378 | 837 | { "visibility", 1, 1, false, false, false, |
f8e93a2e | 838 | handle_visibility_attribute }, |
24dfead4 | 839 | { "tls_model", 1, 1, true, false, false, |
840 | handle_tls_model_attribute }, | |
dbf6c367 | 841 | { "nonnull", 0, -1, false, true, true, |
842 | handle_nonnull_attribute }, | |
fa987697 | 843 | { "nothrow", 0, 0, true, false, false, |
844 | handle_nothrow_attribute }, | |
cb59f969 | 845 | { "may_alias", 0, 0, false, true, false, NULL }, |
7acb29a3 | 846 | { "cleanup", 1, 1, true, false, false, |
847 | handle_cleanup_attribute }, | |
8a8cdb8d | 848 | { "warn_unused_result", 0, 0, false, true, true, |
849 | handle_warn_unused_result_attribute }, | |
50ca527f | 850 | { "sentinel", 0, 1, false, true, true, |
bf6c8de0 | 851 | handle_sentinel_attribute }, |
b5c26b42 | 852 | /* For internal use (marking of builtins) only. The name contains space |
853 | to prevent its usage in source code. */ | |
854 | { "type generic", 0, 0, false, true, true, | |
855 | handle_type_generic_attribute }, | |
4a29c97c | 856 | { "alloc_size", 1, 2, false, true, true, |
857 | handle_alloc_size_attribute }, | |
5de92639 | 858 | { "cold", 0, 0, true, false, false, |
859 | handle_cold_attribute }, | |
860 | { "hot", 0, 0, true, false, false, | |
861 | handle_hot_attribute }, | |
10fc867f | 862 | { "warning", 1, 1, true, false, false, |
863 | handle_error_attribute }, | |
864 | { "error", 1, 1, true, false, false, | |
865 | handle_error_attribute }, | |
24470055 | 866 | { "target", 1, -1, true, false, false, |
867 | handle_target_attribute }, | |
46f8e3b0 | 868 | { "optimize", 1, -1, true, false, false, |
869 | handle_optimize_attribute }, | |
f8e93a2e | 870 | { NULL, 0, 0, false, false, false, NULL } |
871 | }; | |
872 | ||
873 | /* Give the specifications for the format attributes, used by C and all | |
d716ce75 | 874 | descendants. */ |
f8e93a2e | 875 | |
876 | const struct attribute_spec c_common_format_attribute_table[] = | |
877 | { | |
878 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
879 | { "format", 3, 3, false, true, true, | |
880 | handle_format_attribute }, | |
881 | { "format_arg", 1, 1, false, true, true, | |
882 | handle_format_arg_attribute }, | |
883 | { NULL, 0, 0, false, false, false, NULL } | |
884 | }; | |
885 | ||
2c0e001b | 886 | /* Push current bindings for the function name VAR_DECLS. */ |
f4e3c278 | 887 | |
888 | void | |
1cae46be | 889 | start_fname_decls (void) |
f4e3c278 | 890 | { |
65b7f83f | 891 | unsigned ix; |
892 | tree saved = NULL_TREE; | |
1cae46be | 893 | |
65b7f83f | 894 | for (ix = 0; fname_vars[ix].decl; ix++) |
895 | { | |
896 | tree decl = *fname_vars[ix].decl; | |
f4e3c278 | 897 | |
65b7f83f | 898 | if (decl) |
899 | { | |
7016c612 | 900 | saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved); |
65b7f83f | 901 | *fname_vars[ix].decl = NULL_TREE; |
902 | } | |
903 | } | |
904 | if (saved || saved_function_name_decls) | |
905 | /* Normally they'll have been NULL, so only push if we've got a | |
906 | stack, or they are non-NULL. */ | |
907 | saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
908 | saved_function_name_decls); | |
909 | } | |
910 | ||
2363ef00 | 911 | /* Finish up the current bindings, adding them into the current function's |
912 | statement tree. This must be done _before_ finish_stmt_tree is called. | |
913 | If there is no current function, we must be at file scope and no statements | |
914 | are involved. Pop the previous bindings. */ | |
65b7f83f | 915 | |
916 | void | |
1cae46be | 917 | finish_fname_decls (void) |
65b7f83f | 918 | { |
919 | unsigned ix; | |
2363ef00 | 920 | tree stmts = NULL_TREE; |
65b7f83f | 921 | tree stack = saved_function_name_decls; |
922 | ||
923 | for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
2363ef00 | 924 | append_to_statement_list (TREE_VALUE (stack), &stmts); |
1cae46be | 925 | |
2363ef00 | 926 | if (stmts) |
65b7f83f | 927 | { |
2363ef00 | 928 | tree *bodyp = &DECL_SAVED_TREE (current_function_decl); |
5c423bd6 | 929 | |
2363ef00 | 930 | if (TREE_CODE (*bodyp) == BIND_EXPR) |
931 | bodyp = &BIND_EXPR_BODY (*bodyp); | |
81010c97 | 932 | |
bc2b76e0 | 933 | append_to_statement_list_force (*bodyp, &stmts); |
2363ef00 | 934 | *bodyp = stmts; |
65b7f83f | 935 | } |
1cae46be | 936 | |
65b7f83f | 937 | for (ix = 0; fname_vars[ix].decl; ix++) |
938 | *fname_vars[ix].decl = NULL_TREE; | |
1cae46be | 939 | |
65b7f83f | 940 | if (stack) |
f4e3c278 | 941 | { |
2c0e001b | 942 | /* We had saved values, restore them. */ |
65b7f83f | 943 | tree saved; |
944 | ||
945 | for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
946 | { | |
947 | tree decl = TREE_PURPOSE (saved); | |
948 | unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
1cae46be | 949 | |
65b7f83f | 950 | *fname_vars[ix].decl = decl; |
951 | } | |
952 | stack = TREE_CHAIN (stack); | |
f4e3c278 | 953 | } |
65b7f83f | 954 | saved_function_name_decls = stack; |
955 | } | |
956 | ||
81010c97 | 957 | /* Return the text name of the current function, suitably prettified |
5fc7fa69 | 958 | by PRETTY_P. Return string must be freed by caller. */ |
65b7f83f | 959 | |
960 | const char * | |
1cae46be | 961 | fname_as_string (int pretty_p) |
65b7f83f | 962 | { |
9ad4bb1e | 963 | const char *name = "top level"; |
5fc7fa69 | 964 | char *namep; |
8115b8be | 965 | int vrb = 2, len; |
966 | cpp_string cstr = { 0, 0 }, strname; | |
9ad4bb1e | 967 | |
84166705 | 968 | if (!pretty_p) |
9ad4bb1e | 969 | { |
970 | name = ""; | |
971 | vrb = 0; | |
972 | } | |
973 | ||
974 | if (current_function_decl) | |
dc24ddbd | 975 | name = lang_hooks.decl_printable_name (current_function_decl, vrb); |
9ad4bb1e | 976 | |
8115b8be | 977 | len = strlen (name) + 3; /* Two for '"'s. One for NULL. */ |
5fc7fa69 | 978 | |
8115b8be | 979 | namep = XNEWVEC (char, len); |
980 | snprintf (namep, len, "\"%s\"", name); | |
981 | strname.text = (unsigned char *) namep; | |
982 | strname.len = len - 1; | |
5fc7fa69 | 983 | |
924bbf02 | 984 | if (cpp_interpret_string (parse_in, &strname, 1, &cstr, CPP_STRING)) |
8115b8be | 985 | { |
986 | XDELETEVEC (namep); | |
987 | return (const char *) cstr.text; | |
5fc7fa69 | 988 | } |
5fc7fa69 | 989 | |
990 | return namep; | |
65b7f83f | 991 | } |
992 | ||
65b7f83f | 993 | /* Return the VAR_DECL for a const char array naming the current |
994 | function. If the VAR_DECL has not yet been created, create it | |
995 | now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
996 | ID is its name (unfortunately C and C++ hold the RID values of | |
997 | keywords in different places, so we can't derive RID from ID in | |
e3b80d49 | 998 | this language independent code. LOC is the location of the |
999 | function. */ | |
65b7f83f | 1000 | |
1001 | tree | |
e3b80d49 | 1002 | fname_decl (location_t loc, unsigned int rid, tree id) |
65b7f83f | 1003 | { |
1004 | unsigned ix; | |
1005 | tree decl = NULL_TREE; | |
1006 | ||
1007 | for (ix = 0; fname_vars[ix].decl; ix++) | |
1008 | if (fname_vars[ix].rid == rid) | |
1009 | break; | |
1010 | ||
1011 | decl = *fname_vars[ix].decl; | |
1012 | if (!decl) | |
f4e3c278 | 1013 | { |
2222b3c6 | 1014 | /* If a tree is built here, it would normally have the lineno of |
1015 | the current statement. Later this tree will be moved to the | |
1016 | beginning of the function and this line number will be wrong. | |
1017 | To avoid this problem set the lineno to 0 here; that prevents | |
7299020b | 1018 | it from appearing in the RTL. */ |
2363ef00 | 1019 | tree stmts; |
9a6486a6 | 1020 | location_t saved_location = input_location; |
9a6486a6 | 1021 | input_location = UNKNOWN_LOCATION; |
1cae46be | 1022 | |
2363ef00 | 1023 | stmts = push_stmt_list (); |
65b7f83f | 1024 | decl = (*make_fname_decl) (id, fname_vars[ix].pretty); |
2363ef00 | 1025 | stmts = pop_stmt_list (stmts); |
1026 | if (!IS_EMPTY_STMT (stmts)) | |
1027 | saved_function_name_decls | |
1028 | = tree_cons (decl, stmts, saved_function_name_decls); | |
65b7f83f | 1029 | *fname_vars[ix].decl = decl; |
9a6486a6 | 1030 | input_location = saved_location; |
f4e3c278 | 1031 | } |
65b7f83f | 1032 | if (!ix && !current_function_decl) |
e3b80d49 | 1033 | pedwarn (loc, 0, "%qD is not defined outside of function scope", decl); |
81010c97 | 1034 | |
65b7f83f | 1035 | return decl; |
f4e3c278 | 1036 | } |
1037 | ||
070236f0 | 1038 | /* Given a STRING_CST, give it a suitable array-of-chars data type. */ |
b0fc3e72 | 1039 | |
1040 | tree | |
1cae46be | 1041 | fix_string_type (tree value) |
b0fc3e72 | 1042 | { |
070236f0 | 1043 | int length = TREE_STRING_LENGTH (value); |
1044 | int nchars; | |
00d26680 | 1045 | tree e_type, i_type, a_type; |
1046 | ||
73be5127 | 1047 | /* Compute the number of elements, for the array type. */ |
924bbf02 | 1048 | if (TREE_TYPE (value) == char_array_type_node || !TREE_TYPE (value)) |
1049 | { | |
1050 | nchars = length; | |
1051 | e_type = char_type_node; | |
1052 | } | |
1053 | else if (TREE_TYPE (value) == char16_array_type_node) | |
1054 | { | |
1055 | nchars = length / (TYPE_PRECISION (char16_type_node) / BITS_PER_UNIT); | |
1056 | e_type = char16_type_node; | |
1057 | } | |
1058 | else if (TREE_TYPE (value) == char32_array_type_node) | |
1059 | { | |
1060 | nchars = length / (TYPE_PRECISION (char32_type_node) / BITS_PER_UNIT); | |
1061 | e_type = char32_type_node; | |
1062 | } | |
1063 | else | |
1064 | { | |
1065 | nchars = length / (TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT); | |
1066 | e_type = wchar_type_node; | |
1067 | } | |
b0fc3e72 | 1068 | |
1d752508 | 1069 | /* C89 2.2.4.1, C99 5.2.4.1 (Translation limits). The analogous |
1070 | limit in C++98 Annex B is very large (65536) and is not normative, | |
1071 | so we do not diagnose it (warn_overlength_strings is forced off | |
1072 | in c_common_post_options). */ | |
1073 | if (warn_overlength_strings) | |
1074 | { | |
1075 | const int nchars_max = flag_isoc99 ? 4095 : 509; | |
1076 | const int relevant_std = flag_isoc99 ? 99 : 90; | |
1077 | if (nchars - 1 > nchars_max) | |
1078 | /* Translators: The %d after 'ISO C' will be 90 or 99. Do not | |
1079 | separate the %d from the 'C'. 'ISO' should not be | |
1080 | translated, but it may be moved after 'C%d' in languages | |
1081 | where modifiers follow nouns. */ | |
21ca8540 | 1082 | pedwarn (input_location, OPT_Woverlength_strings, |
8864917d | 1083 | "string length %qd is greater than the length %qd " |
1d752508 | 1084 | "ISO C%d compilers are required to support", |
1085 | nchars - 1, nchars_max, relevant_std); | |
1086 | } | |
82cfc7f7 | 1087 | |
390be14e | 1088 | /* Create the array type for the string constant. The ISO C++ |
1089 | standard says that a string literal has type `const char[N]' or | |
1090 | `const wchar_t[N]'. We use the same logic when invoked as a C | |
1091 | front-end with -Wwrite-strings. | |
1092 | ??? We should change the type of an expression depending on the | |
1093 | state of a warning flag. We should just be warning -- see how | |
1094 | this is handled in the C++ front-end for the deprecated implicit | |
1095 | conversion from string literals to `char*' or `wchar_t*'. | |
00d26680 | 1096 | |
1097 | The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified | |
1098 | array type being the unqualified version of that type. | |
1099 | Therefore, if we are constructing an array of const char, we must | |
1100 | construct the matching unqualified array type first. The C front | |
1101 | end does not require this, but it does no harm, so we do it | |
1102 | unconditionally. */ | |
7016c612 | 1103 | i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1)); |
00d26680 | 1104 | a_type = build_array_type (e_type, i_type); |
390be14e | 1105 | if (c_dialect_cxx() || warn_write_strings) |
aebc8537 | 1106 | a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST); |
3a10ba35 | 1107 | |
00d26680 | 1108 | TREE_TYPE (value) = a_type; |
b8e3b7ad | 1109 | TREE_CONSTANT (value) = 1; |
a814bad5 | 1110 | TREE_READONLY (value) = 1; |
b0fc3e72 | 1111 | TREE_STATIC (value) = 1; |
1112 | return value; | |
1113 | } | |
1114 | \f | |
a75b1c71 | 1115 | /* Fully fold EXPR, an expression that was not folded (beyond integer |
1116 | constant expressions and null pointer constants) when being built | |
1117 | up. If IN_INIT, this is in a static initializer and certain | |
1118 | changes are made to the folding done. Clear *MAYBE_CONST if | |
1119 | MAYBE_CONST is not NULL and EXPR is definitely not a constant | |
1120 | expression because it contains an evaluated operator (in C99) or an | |
1121 | operator outside of sizeof returning an integer constant (in C90) | |
1122 | not permitted in constant expressions, or because it contains an | |
1123 | evaluated arithmetic overflow. (*MAYBE_CONST should typically be | |
1124 | set to true by callers before calling this function.) Return the | |
1125 | folded expression. Function arguments have already been folded | |
1126 | before calling this function, as have the contents of SAVE_EXPR, | |
1127 | TARGET_EXPR, BIND_EXPR, VA_ARG_EXPR, OBJ_TYPE_REF and | |
1128 | C_MAYBE_CONST_EXPR. */ | |
1129 | ||
1130 | tree | |
1131 | c_fully_fold (tree expr, bool in_init, bool *maybe_const) | |
1132 | { | |
1133 | tree ret; | |
1134 | bool dummy = true; | |
1135 | bool maybe_const_itself = true; | |
1136 | ||
1137 | /* This function is not relevant to C++ because C++ folds while | |
1138 | parsing, and may need changes to be correct for C++ when C++ | |
1139 | stops folding while parsing. */ | |
1140 | if (c_dialect_cxx ()) | |
1141 | gcc_unreachable (); | |
1142 | ||
1143 | if (!maybe_const) | |
1144 | maybe_const = &dummy; | |
1145 | ret = c_fully_fold_internal (expr, in_init, maybe_const, | |
1146 | &maybe_const_itself); | |
1147 | *maybe_const &= maybe_const_itself; | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | /* Internal helper for c_fully_fold. EXPR and IN_INIT are as for | |
1152 | c_fully_fold. *MAYBE_CONST_OPERANDS is cleared because of operands | |
1153 | not permitted, while *MAYBE_CONST_ITSELF is cleared because of | |
1154 | arithmetic overflow (for C90, *MAYBE_CONST_OPERANDS is carried from | |
1155 | both evaluated and unevaluated subexpressions while | |
1156 | *MAYBE_CONST_ITSELF is carried from only evaluated | |
1157 | subexpressions). */ | |
1158 | ||
1159 | static tree | |
1160 | c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands, | |
1161 | bool *maybe_const_itself) | |
1162 | { | |
1163 | tree ret = expr; | |
1164 | enum tree_code code = TREE_CODE (expr); | |
1165 | enum tree_code_class kind = TREE_CODE_CLASS (code); | |
1166 | location_t loc = EXPR_LOCATION (expr); | |
1167 | tree op0, op1, op2, op3; | |
1168 | tree orig_op0, orig_op1, orig_op2; | |
1169 | bool op0_const = true, op1_const = true, op2_const = true; | |
1170 | bool op0_const_self = true, op1_const_self = true, op2_const_self = true; | |
1171 | bool nowarning = TREE_NO_WARNING (expr); | |
1172 | ||
1173 | /* This function is not relevant to C++ because C++ folds while | |
1174 | parsing, and may need changes to be correct for C++ when C++ | |
1175 | stops folding while parsing. */ | |
1176 | if (c_dialect_cxx ()) | |
1177 | gcc_unreachable (); | |
1178 | ||
1179 | /* Constants, declarations, statements, errors, SAVE_EXPRs and | |
1180 | anything else not counted as an expression cannot usefully be | |
1181 | folded further at this point. */ | |
1182 | if (!IS_EXPR_CODE_CLASS (kind) | |
1183 | || kind == tcc_statement | |
1184 | || code == SAVE_EXPR) | |
1185 | return expr; | |
1186 | ||
1187 | /* Operands of variable-length expressions (function calls) have | |
1188 | already been folded, as have __builtin_* function calls, and such | |
1189 | expressions cannot occur in constant expressions. */ | |
1190 | if (kind == tcc_vl_exp) | |
1191 | { | |
1192 | *maybe_const_operands = false; | |
1193 | ret = fold (expr); | |
1194 | goto out; | |
1195 | } | |
1196 | ||
1197 | if (code == C_MAYBE_CONST_EXPR) | |
1198 | { | |
1199 | tree pre = C_MAYBE_CONST_EXPR_PRE (expr); | |
1200 | tree inner = C_MAYBE_CONST_EXPR_EXPR (expr); | |
1201 | if (C_MAYBE_CONST_EXPR_NON_CONST (expr)) | |
1202 | *maybe_const_operands = false; | |
1203 | if (C_MAYBE_CONST_EXPR_INT_OPERANDS (expr)) | |
1204 | *maybe_const_itself = false; | |
1205 | if (pre && !in_init) | |
1206 | ret = build2 (COMPOUND_EXPR, TREE_TYPE (expr), pre, inner); | |
1207 | else | |
1208 | ret = inner; | |
1209 | goto out; | |
1210 | } | |
1211 | ||
1212 | /* Assignment, increment, decrement, function call and comma | |
1213 | operators, and statement expressions, cannot occur in constant | |
1214 | expressions if evaluated / outside of sizeof. (Function calls | |
1215 | were handled above, though VA_ARG_EXPR is treated like a function | |
1216 | call here, and statement expressions are handled through | |
1217 | C_MAYBE_CONST_EXPR to avoid folding inside them.) */ | |
1218 | switch (code) | |
1219 | { | |
1220 | case MODIFY_EXPR: | |
1221 | case PREDECREMENT_EXPR: | |
1222 | case PREINCREMENT_EXPR: | |
1223 | case POSTDECREMENT_EXPR: | |
1224 | case POSTINCREMENT_EXPR: | |
1225 | case COMPOUND_EXPR: | |
1226 | *maybe_const_operands = false; | |
1227 | break; | |
1228 | ||
1229 | case VA_ARG_EXPR: | |
1230 | case TARGET_EXPR: | |
1231 | case BIND_EXPR: | |
1232 | case OBJ_TYPE_REF: | |
1233 | *maybe_const_operands = false; | |
1234 | ret = fold (expr); | |
1235 | goto out; | |
1236 | ||
1237 | default: | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | /* Fold individual tree codes as appropriate. */ | |
1242 | switch (code) | |
1243 | { | |
1244 | case COMPOUND_LITERAL_EXPR: | |
1245 | /* Any non-constancy will have been marked in a containing | |
1246 | C_MAYBE_CONST_EXPR; there is no more folding to do here. */ | |
1247 | goto out; | |
1248 | ||
1249 | case COMPONENT_REF: | |
1250 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1251 | op1 = TREE_OPERAND (expr, 1); | |
1252 | op2 = TREE_OPERAND (expr, 2); | |
1253 | op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1254 | maybe_const_itself); | |
1255 | if (op0 != orig_op0) | |
1256 | ret = build3 (COMPONENT_REF, TREE_TYPE (expr), op0, op1, op2); | |
1257 | if (ret != expr) | |
1258 | { | |
1259 | TREE_READONLY (ret) = TREE_READONLY (expr); | |
1260 | TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1261 | } | |
1262 | goto out; | |
1263 | ||
1264 | case ARRAY_REF: | |
1265 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1266 | orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1267 | op2 = TREE_OPERAND (expr, 2); | |
1268 | op3 = TREE_OPERAND (expr, 3); | |
1269 | op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1270 | maybe_const_itself); | |
1271 | op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands, | |
1272 | maybe_const_itself); | |
1273 | op1 = decl_constant_value_for_optimization (op1); | |
1274 | if (op0 != orig_op0 || op1 != orig_op1) | |
1275 | ret = build4 (ARRAY_REF, TREE_TYPE (expr), op0, op1, op2, op3); | |
1276 | if (ret != expr) | |
1277 | { | |
1278 | TREE_READONLY (ret) = TREE_READONLY (expr); | |
1279 | TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr); | |
1280 | TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1281 | } | |
1282 | ret = fold (ret); | |
1283 | goto out; | |
1284 | ||
1285 | case COMPOUND_EXPR: | |
1286 | case MODIFY_EXPR: | |
1287 | case PREDECREMENT_EXPR: | |
1288 | case PREINCREMENT_EXPR: | |
1289 | case POSTDECREMENT_EXPR: | |
1290 | case POSTINCREMENT_EXPR: | |
1291 | case PLUS_EXPR: | |
1292 | case MINUS_EXPR: | |
1293 | case MULT_EXPR: | |
1294 | case POINTER_PLUS_EXPR: | |
1295 | case TRUNC_DIV_EXPR: | |
1296 | case CEIL_DIV_EXPR: | |
1297 | case FLOOR_DIV_EXPR: | |
1298 | case TRUNC_MOD_EXPR: | |
1299 | case RDIV_EXPR: | |
1300 | case EXACT_DIV_EXPR: | |
1301 | case LSHIFT_EXPR: | |
1302 | case RSHIFT_EXPR: | |
1303 | case BIT_IOR_EXPR: | |
1304 | case BIT_XOR_EXPR: | |
1305 | case BIT_AND_EXPR: | |
1306 | case LT_EXPR: | |
1307 | case LE_EXPR: | |
1308 | case GT_EXPR: | |
1309 | case GE_EXPR: | |
1310 | case EQ_EXPR: | |
1311 | case NE_EXPR: | |
1312 | case COMPLEX_EXPR: | |
1313 | case TRUTH_AND_EXPR: | |
1314 | case TRUTH_OR_EXPR: | |
1315 | case TRUTH_XOR_EXPR: | |
1316 | case UNORDERED_EXPR: | |
1317 | case ORDERED_EXPR: | |
1318 | case UNLT_EXPR: | |
1319 | case UNLE_EXPR: | |
1320 | case UNGT_EXPR: | |
1321 | case UNGE_EXPR: | |
1322 | case UNEQ_EXPR: | |
1323 | /* Binary operations evaluating both arguments (increment and | |
1324 | decrement are binary internally in GCC). */ | |
1325 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1326 | orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1327 | op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1328 | maybe_const_itself); | |
1329 | if (code != MODIFY_EXPR | |
1330 | && code != PREDECREMENT_EXPR | |
1331 | && code != PREINCREMENT_EXPR | |
1332 | && code != POSTDECREMENT_EXPR | |
1333 | && code != POSTINCREMENT_EXPR) | |
1334 | op0 = decl_constant_value_for_optimization (op0); | |
1335 | /* The RHS of a MODIFY_EXPR was fully folded when building that | |
1336 | expression for the sake of conversion warnings. */ | |
1337 | if (code != MODIFY_EXPR) | |
1338 | op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands, | |
1339 | maybe_const_itself); | |
1340 | op1 = decl_constant_value_for_optimization (op1); | |
1341 | if (op0 != orig_op0 || op1 != orig_op1 || in_init) | |
1342 | ret = in_init | |
1343 | ? fold_build2_initializer (code, TREE_TYPE (expr), op0, op1) | |
1344 | : fold_build2 (code, TREE_TYPE (expr), op0, op1); | |
1345 | else | |
1346 | ret = fold (expr); | |
1347 | goto out; | |
1348 | ||
1349 | case INDIRECT_REF: | |
1350 | case FIX_TRUNC_EXPR: | |
1351 | case FLOAT_EXPR: | |
1352 | CASE_CONVERT: | |
1353 | case NON_LVALUE_EXPR: | |
1354 | case NEGATE_EXPR: | |
1355 | case BIT_NOT_EXPR: | |
1356 | case TRUTH_NOT_EXPR: | |
1357 | case ADDR_EXPR: | |
1358 | case CONJ_EXPR: | |
1359 | case REALPART_EXPR: | |
1360 | case IMAGPART_EXPR: | |
1361 | /* Unary operations. */ | |
1362 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1363 | op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1364 | maybe_const_itself); | |
1365 | if (code != ADDR_EXPR && code != REALPART_EXPR && code != IMAGPART_EXPR) | |
1366 | op0 = decl_constant_value_for_optimization (op0); | |
1367 | if (op0 != orig_op0 || in_init) | |
1368 | ret = in_init | |
1369 | ? fold_build1_initializer (code, TREE_TYPE (expr), op0) | |
1370 | : fold_build1 (code, TREE_TYPE (expr), op0); | |
1371 | else | |
1372 | ret = fold (expr); | |
1373 | if (code == INDIRECT_REF | |
1374 | && ret != expr | |
1375 | && TREE_CODE (ret) == INDIRECT_REF) | |
1376 | { | |
1377 | TREE_READONLY (ret) = TREE_READONLY (expr); | |
1378 | TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr); | |
1379 | TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1380 | } | |
1381 | goto out; | |
1382 | ||
1383 | case TRUTH_ANDIF_EXPR: | |
1384 | case TRUTH_ORIF_EXPR: | |
1385 | /* Binary operations not necessarily evaluating both | |
1386 | arguments. */ | |
1387 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1388 | orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1389 | op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self); | |
1390 | op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self); | |
1391 | if (op0 != orig_op0 || op1 != orig_op1 || in_init) | |
1392 | ret = in_init | |
1393 | ? fold_build2_initializer (code, TREE_TYPE (expr), op0, op1) | |
1394 | : fold_build2 (code, TREE_TYPE (expr), op0, op1); | |
1395 | else | |
1396 | ret = fold (expr); | |
1397 | *maybe_const_operands &= op0_const; | |
1398 | *maybe_const_itself &= op0_const_self; | |
1399 | if (!(flag_isoc99 | |
1400 | && op0_const | |
1401 | && op0_const_self | |
1402 | && (code == TRUTH_ANDIF_EXPR | |
1403 | ? op0 == truthvalue_false_node | |
1404 | : op0 == truthvalue_true_node))) | |
1405 | *maybe_const_operands &= op1_const; | |
1406 | if (!(op0_const | |
1407 | && op0_const_self | |
1408 | && (code == TRUTH_ANDIF_EXPR | |
1409 | ? op0 == truthvalue_false_node | |
1410 | : op0 == truthvalue_true_node))) | |
1411 | *maybe_const_itself &= op1_const_self; | |
1412 | goto out; | |
1413 | ||
1414 | case COND_EXPR: | |
1415 | orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1416 | orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1417 | orig_op2 = op2 = TREE_OPERAND (expr, 2); | |
1418 | op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self); | |
1419 | op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self); | |
1420 | op2 = c_fully_fold_internal (op2, in_init, &op2_const, &op2_const_self); | |
1421 | if (op0 != orig_op0 || op1 != orig_op1 || op2 != orig_op2) | |
1422 | ret = fold_build3 (code, TREE_TYPE (expr), op0, op1, op2); | |
1423 | else | |
1424 | ret = fold (expr); | |
1425 | *maybe_const_operands &= op0_const; | |
1426 | *maybe_const_itself &= op0_const_self; | |
1427 | if (!(flag_isoc99 | |
1428 | && op0_const | |
1429 | && op0_const_self | |
1430 | && op0 == truthvalue_false_node)) | |
1431 | *maybe_const_operands &= op1_const; | |
1432 | if (!(op0_const | |
1433 | && op0_const_self | |
1434 | && op0 == truthvalue_false_node)) | |
1435 | *maybe_const_itself &= op1_const_self; | |
1436 | if (!(flag_isoc99 | |
1437 | && op0_const | |
1438 | && op0_const_self | |
1439 | && op0 == truthvalue_true_node)) | |
1440 | *maybe_const_operands &= op2_const; | |
1441 | if (!(op0_const | |
1442 | && op0_const_self | |
1443 | && op0 == truthvalue_true_node)) | |
1444 | *maybe_const_itself &= op2_const_self; | |
1445 | goto out; | |
1446 | ||
1447 | default: | |
1448 | /* Various codes may appear through folding built-in functions | |
1449 | and their arguments. */ | |
1450 | goto out; | |
1451 | } | |
1452 | ||
1453 | out: | |
1454 | /* Some folding may introduce NON_LVALUE_EXPRs; all lvalue checks | |
1455 | have been done by this point, so remove them again. */ | |
1456 | nowarning |= TREE_NO_WARNING (ret); | |
1457 | STRIP_TYPE_NOPS (ret); | |
1458 | if (nowarning && !TREE_NO_WARNING (ret)) | |
1459 | { | |
1460 | if (!CAN_HAVE_LOCATION_P (ret)) | |
1461 | ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret); | |
1462 | TREE_NO_WARNING (ret) = 1; | |
1463 | } | |
1464 | if (ret != expr) | |
1465 | protected_set_expr_location (ret, loc); | |
1466 | return ret; | |
1467 | } | |
1468 | ||
1469 | /* If not optimizing, EXP is not a VAR_DECL, or EXP has array type, | |
1470 | return EXP. Otherwise, return either EXP or its known constant | |
1471 | value (if it has one), but return EXP if EXP has mode BLKmode. ??? | |
1472 | Is the BLKmode test appropriate? */ | |
1473 | ||
1474 | tree | |
1475 | decl_constant_value_for_optimization (tree exp) | |
1476 | { | |
1477 | tree ret; | |
1478 | ||
1479 | /* This function is only used by C, for c_fully_fold and other | |
1480 | optimization, and may not be correct for C++. */ | |
1481 | if (c_dialect_cxx ()) | |
1482 | gcc_unreachable (); | |
1483 | ||
1484 | if (!optimize | |
1485 | || TREE_CODE (exp) != VAR_DECL | |
1486 | || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
1487 | || DECL_MODE (exp) == BLKmode) | |
1488 | return exp; | |
1489 | ||
1490 | ret = decl_constant_value (exp); | |
1491 | /* Avoid unwanted tree sharing between the initializer and current | |
1492 | function's body where the tree can be modified e.g. by the | |
1493 | gimplifier. */ | |
1494 | if (ret != exp && TREE_STATIC (exp)) | |
1495 | ret = unshare_expr (ret); | |
1496 | return ret; | |
1497 | } | |
1498 | ||
2a1736ed | 1499 | /* Print a warning if a constant expression had overflow in folding. |
1500 | Invoke this function on every expression that the language | |
1501 | requires to be a constant expression. | |
1502 | Note the ANSI C standard says it is erroneous for a | |
1503 | constant expression to overflow. */ | |
b2806639 | 1504 | |
1505 | void | |
1cae46be | 1506 | constant_expression_warning (tree value) |
07317e69 | 1507 | { |
1508 | if (warn_overflow && pedantic | |
1509 | && (TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST | |
1510 | || TREE_CODE (value) == FIXED_CST | |
1511 | || TREE_CODE (value) == VECTOR_CST | |
1512 | || TREE_CODE (value) == COMPLEX_CST) | |
1513 | && TREE_OVERFLOW (value)) | |
21ca8540 | 1514 | pedwarn (input_location, OPT_Woverflow, "overflow in constant expression"); |
07317e69 | 1515 | } |
1516 | ||
1517 | /* The same as above but print an unconditional error. */ | |
1518 | void | |
1519 | constant_expression_error (tree value) | |
b2806639 | 1520 | { |
837e1122 | 1521 | if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST |
9421ebb9 | 1522 | || TREE_CODE (value) == FIXED_CST |
886cfd4f | 1523 | || TREE_CODE (value) == VECTOR_CST |
837e1122 | 1524 | || TREE_CODE (value) == COMPLEX_CST) |
07317e69 | 1525 | && TREE_OVERFLOW (value)) |
1526 | error ("overflow in constant expression"); | |
2a1736ed | 1527 | } |
1528 | ||
f170d67f | 1529 | /* Print a warning if an expression had overflow in folding and its |
1530 | operands hadn't. | |
1531 | ||
2a1736ed | 1532 | Invoke this function on every expression that |
1533 | (1) appears in the source code, and | |
f170d67f | 1534 | (2) is a constant expression that overflowed, and |
2a1736ed | 1535 | (3) is not already checked by convert_and_check; |
f170d67f | 1536 | however, do not invoke this function on operands of explicit casts |
1537 | or when the expression is the result of an operator and any operand | |
1538 | already overflowed. */ | |
2a1736ed | 1539 | |
1540 | void | |
1cae46be | 1541 | overflow_warning (tree value) |
2a1736ed | 1542 | { |
f170d67f | 1543 | if (skip_evaluation) return; |
1544 | ||
1545 | switch (TREE_CODE (value)) | |
886cfd4f | 1546 | { |
f170d67f | 1547 | case INTEGER_CST: |
1548 | warning (OPT_Woverflow, "integer overflow in expression"); | |
1549 | break; | |
1550 | ||
1551 | case REAL_CST: | |
1552 | warning (OPT_Woverflow, "floating point overflow in expression"); | |
1553 | break; | |
1554 | ||
9421ebb9 | 1555 | case FIXED_CST: |
1556 | warning (OPT_Woverflow, "fixed-point overflow in expression"); | |
1557 | break; | |
1558 | ||
f170d67f | 1559 | case VECTOR_CST: |
1560 | warning (OPT_Woverflow, "vector overflow in expression"); | |
1561 | break; | |
1562 | ||
1563 | case COMPLEX_CST: | |
1564 | if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST) | |
1565 | warning (OPT_Woverflow, "complex integer overflow in expression"); | |
1566 | else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST) | |
1567 | warning (OPT_Woverflow, "complex floating point overflow in expression"); | |
1568 | break; | |
1569 | ||
1570 | default: | |
1571 | break; | |
886cfd4f | 1572 | } |
2a1736ed | 1573 | } |
1574 | ||
b13d1547 | 1575 | |
1576 | /* Warn about use of a logical || / && operator being used in a | |
1577 | context where it is likely that the bitwise equivalent was intended | |
1578 | by the programmer. CODE is the TREE_CODE of the operator, ARG1 | |
1579 | and ARG2 the arguments. */ | |
1580 | ||
1581 | void | |
1582 | warn_logical_operator (enum tree_code code, tree arg1, tree | |
1583 | arg2) | |
1584 | { | |
1585 | switch (code) | |
1586 | { | |
1587 | case TRUTH_ANDIF_EXPR: | |
1588 | case TRUTH_ORIF_EXPR: | |
1589 | case TRUTH_OR_EXPR: | |
1590 | case TRUTH_AND_EXPR: | |
e6978426 | 1591 | if (!TREE_NO_WARNING (arg1) |
1592 | && INTEGRAL_TYPE_P (TREE_TYPE (arg1)) | |
1593 | && !CONSTANT_CLASS_P (arg1) | |
1594 | && TREE_CODE (arg2) == INTEGER_CST | |
1595 | && !integer_zerop (arg2)) | |
1596 | { | |
1597 | warning (OPT_Wlogical_op, | |
1598 | "logical %<%s%> with non-zero constant " | |
1599 | "will always evaluate as true", | |
1600 | ((code == TRUTH_ANDIF_EXPR) | |
1601 | || (code == TRUTH_AND_EXPR)) ? "&&" : "||"); | |
1602 | TREE_NO_WARNING (arg1) = true; | |
1603 | } | |
1604 | break; | |
b13d1547 | 1605 | default: |
e6978426 | 1606 | break; |
b13d1547 | 1607 | } |
1608 | } | |
1609 | ||
1610 | ||
bcf22371 | 1611 | /* Print a warning about casts that might indicate violation |
1612 | of strict aliasing rules if -Wstrict-aliasing is used and | |
1e31ff37 | 1613 | strict aliasing mode is in effect. OTYPE is the original |
1614 | TREE_TYPE of EXPR, and TYPE the type we're casting to. */ | |
bcf22371 | 1615 | |
e6fa0ea6 | 1616 | bool |
1e31ff37 | 1617 | strict_aliasing_warning (tree otype, tree type, tree expr) |
bcf22371 | 1618 | { |
f06537f2 | 1619 | if (!(flag_strict_aliasing |
1620 | && POINTER_TYPE_P (type) | |
1621 | && POINTER_TYPE_P (otype) | |
1622 | && !VOID_TYPE_P (TREE_TYPE (type))) | |
1623 | /* If the type we are casting to is a ref-all pointer | |
1624 | dereferencing it is always valid. */ | |
1625 | || TYPE_REF_CAN_ALIAS_ALL (type)) | |
e6fa0ea6 | 1626 | return false; |
1627 | ||
1628 | if ((warn_strict_aliasing > 1) && TREE_CODE (expr) == ADDR_EXPR | |
bcf22371 | 1629 | && (DECL_P (TREE_OPERAND (expr, 0)) |
e6fa0ea6 | 1630 | || handled_component_p (TREE_OPERAND (expr, 0)))) |
bcf22371 | 1631 | { |
1632 | /* Casting the address of an object to non void pointer. Warn | |
1633 | if the cast breaks type based aliasing. */ | |
e6fa0ea6 | 1634 | if (!COMPLETE_TYPE_P (TREE_TYPE (type)) && warn_strict_aliasing == 2) |
1635 | { | |
1636 | warning (OPT_Wstrict_aliasing, "type-punning to incomplete type " | |
1637 | "might break strict-aliasing rules"); | |
1638 | return true; | |
1639 | } | |
bcf22371 | 1640 | else |
1641 | { | |
e6fa0ea6 | 1642 | /* warn_strict_aliasing >= 3. This includes the default (3). |
1643 | Only warn if the cast is dereferenced immediately. */ | |
32c2fdea | 1644 | alias_set_type set1 = |
e6fa0ea6 | 1645 | get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))); |
32c2fdea | 1646 | alias_set_type set2 = get_alias_set (TREE_TYPE (type)); |
bcf22371 | 1647 | |
62d823d0 | 1648 | if (set1 != set2 && set2 != 0 |
1649 | && (set1 == 0 || !alias_sets_conflict_p (set1, set2))) | |
e6fa0ea6 | 1650 | { |
1651 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1652 | "pointer will break strict-aliasing rules"); | |
1653 | return true; | |
1654 | } | |
1655 | else if (warn_strict_aliasing == 2 | |
879f881c | 1656 | && !alias_sets_must_conflict_p (set1, set2)) |
e6fa0ea6 | 1657 | { |
1658 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1659 | "pointer might break strict-aliasing rules"); | |
1660 | return true; | |
1661 | } | |
bcf22371 | 1662 | } |
1663 | } | |
e6fa0ea6 | 1664 | else |
1665 | if ((warn_strict_aliasing == 1) && !VOID_TYPE_P (TREE_TYPE (otype))) | |
1666 | { | |
1667 | /* At this level, warn for any conversions, even if an address is | |
1668 | not taken in the same statement. This will likely produce many | |
1669 | false positives, but could be useful to pinpoint problems that | |
1670 | are not revealed at higher levels. */ | |
32c2fdea | 1671 | alias_set_type set1 = get_alias_set (TREE_TYPE (otype)); |
1672 | alias_set_type set2 = get_alias_set (TREE_TYPE (type)); | |
1673 | if (!COMPLETE_TYPE_P (type) | |
879f881c | 1674 | || !alias_sets_must_conflict_p (set1, set2)) |
e6fa0ea6 | 1675 | { |
1676 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1677 | "pointer might break strict-aliasing rules"); | |
1678 | return true; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | return false; | |
bcf22371 | 1683 | } |
1684 | ||
3f08e399 | 1685 | /* Warn for unlikely, improbable, or stupid DECL declarations |
1686 | of `main'. */ | |
1687 | ||
1688 | void | |
1689 | check_main_parameter_types (tree decl) | |
1690 | { | |
1691 | tree args; | |
1692 | int argct = 0; | |
1693 | ||
1694 | for (args = TYPE_ARG_TYPES (TREE_TYPE (decl)); args; | |
1695 | args = TREE_CHAIN (args)) | |
1696 | { | |
1697 | tree type = args ? TREE_VALUE (args) : 0; | |
1698 | ||
7accad14 | 1699 | if (type == void_type_node || type == error_mark_node ) |
3f08e399 | 1700 | break; |
1701 | ||
1702 | ++argct; | |
1703 | switch (argct) | |
1704 | { | |
1705 | case 1: | |
1706 | if (TYPE_MAIN_VARIANT (type) != integer_type_node) | |
21ca8540 | 1707 | pedwarn (input_location, OPT_Wmain, "first argument of %q+D should be %<int%>", |
23efcc02 | 1708 | decl); |
3f08e399 | 1709 | break; |
1710 | ||
1711 | case 2: | |
1712 | if (TREE_CODE (type) != POINTER_TYPE | |
1713 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1714 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1715 | != char_type_node)) | |
21ca8540 | 1716 | pedwarn (input_location, OPT_Wmain, "second argument of %q+D should be %<char **%>", |
23efcc02 | 1717 | decl); |
3f08e399 | 1718 | break; |
1719 | ||
1720 | case 3: | |
1721 | if (TREE_CODE (type) != POINTER_TYPE | |
1722 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1723 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1724 | != char_type_node)) | |
21ca8540 | 1725 | pedwarn (input_location, OPT_Wmain, "third argument of %q+D should probably be " |
23efcc02 | 1726 | "%<char **%>", decl); |
3f08e399 | 1727 | break; |
1728 | } | |
1729 | } | |
1730 | ||
1731 | /* It is intentional that this message does not mention the third | |
1732 | argument because it's only mentioned in an appendix of the | |
1733 | standard. */ | |
1734 | if (argct > 0 && (argct < 2 || argct > 3)) | |
21ca8540 | 1735 | pedwarn (input_location, OPT_Wmain, "%q+D takes only zero or two arguments", decl); |
3f08e399 | 1736 | } |
1737 | ||
ed7c4e62 | 1738 | /* True if pointers to distinct types T1 and T2 can be converted to |
1739 | each other without an explicit cast. Only returns true for opaque | |
1740 | vector types. */ | |
1741 | bool | |
1742 | vector_targets_convertible_p (const_tree t1, const_tree t2) | |
1743 | { | |
1744 | if (TREE_CODE (t1) == VECTOR_TYPE && TREE_CODE (t2) == VECTOR_TYPE | |
1745 | && (targetm.vector_opaque_p (t1) || targetm.vector_opaque_p (t2)) | |
1746 | && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
1747 | return true; | |
1748 | ||
1749 | return false; | |
1750 | } | |
1751 | ||
546c4794 | 1752 | /* True if vector types T1 and T2 can be converted to each other |
1753 | without an explicit cast. If EMIT_LAX_NOTE is true, and T1 and T2 | |
1754 | can only be converted with -flax-vector-conversions yet that is not | |
1755 | in effect, emit a note telling the user about that option if such | |
1756 | a note has not previously been emitted. */ | |
1757 | bool | |
9f627b1a | 1758 | vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note) |
8b4b9810 | 1759 | { |
546c4794 | 1760 | static bool emitted_lax_note = false; |
ae6db8ab | 1761 | bool convertible_lax; |
1762 | ||
1763 | if ((targetm.vector_opaque_p (t1) || targetm.vector_opaque_p (t2)) | |
1764 | && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
1765 | return true; | |
1766 | ||
1767 | convertible_lax = | |
1768 | (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)) | |
1769 | && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE || | |
1770 | TYPE_PRECISION (t1) == TYPE_PRECISION (t2)) | |
1771 | && (INTEGRAL_TYPE_P (TREE_TYPE (t1)) | |
1772 | == INTEGRAL_TYPE_P (TREE_TYPE (t2)))); | |
546c4794 | 1773 | |
1774 | if (!convertible_lax || flag_lax_vector_conversions) | |
1775 | return convertible_lax; | |
1776 | ||
1777 | if (TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
29f51994 | 1778 | && lang_hooks.types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))) |
546c4794 | 1779 | return true; |
1780 | ||
1781 | if (emit_lax_note && !emitted_lax_note) | |
1782 | { | |
1783 | emitted_lax_note = true; | |
5bcc316e | 1784 | inform (input_location, "use -flax-vector-conversions to permit " |
546c4794 | 1785 | "conversions between vectors with differing " |
1786 | "element types or numbers of subparts"); | |
1787 | } | |
1788 | ||
1789 | return false; | |
8b4b9810 | 1790 | } |
1791 | ||
2561cea2 | 1792 | /* This is a helper function of build_binary_op. |
1793 | ||
1794 | For certain operations if both args were extended from the same | |
1795 | smaller type, do the arithmetic in that type and then extend. | |
1796 | ||
1797 | BITWISE indicates a bitwise operation. | |
1798 | For them, this optimization is safe only if | |
1799 | both args are zero-extended or both are sign-extended. | |
1800 | Otherwise, we might change the result. | |
1801 | Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
1802 | but calculated in (unsigned short) it would be (unsigned short)-1. | |
1803 | */ | |
1804 | tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise) | |
1805 | { | |
1806 | int unsigned0, unsigned1; | |
1807 | tree arg0, arg1; | |
1808 | int uns; | |
1809 | tree type; | |
1810 | ||
1811 | /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents | |
1812 | excessive narrowing when we call get_narrower below. For | |
1813 | example, suppose that OP0 is of unsigned int extended | |
1814 | from signed char and that RESULT_TYPE is long long int. | |
1815 | If we explicitly cast OP0 to RESULT_TYPE, OP0 would look | |
1816 | like | |
1817 | ||
1818 | (long long int) (unsigned int) signed_char | |
1819 | ||
1820 | which get_narrower would narrow down to | |
1821 | ||
1822 | (unsigned int) signed char | |
1823 | ||
1824 | If we do not cast OP0 first, get_narrower would return | |
1825 | signed_char, which is inconsistent with the case of the | |
1826 | explicit cast. */ | |
1827 | op0 = convert (result_type, op0); | |
1828 | op1 = convert (result_type, op1); | |
1829 | ||
1830 | arg0 = get_narrower (op0, &unsigned0); | |
1831 | arg1 = get_narrower (op1, &unsigned1); | |
1832 | ||
1833 | /* UNS is 1 if the operation to be done is an unsigned one. */ | |
1834 | uns = TYPE_UNSIGNED (result_type); | |
1835 | ||
1836 | /* Handle the case that OP0 (or OP1) does not *contain* a conversion | |
1837 | but it *requires* conversion to FINAL_TYPE. */ | |
1838 | ||
1839 | if ((TYPE_PRECISION (TREE_TYPE (op0)) | |
1840 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
1841 | && TREE_TYPE (op0) != result_type) | |
1842 | unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); | |
1843 | if ((TYPE_PRECISION (TREE_TYPE (op1)) | |
1844 | == TYPE_PRECISION (TREE_TYPE (arg1))) | |
1845 | && TREE_TYPE (op1) != result_type) | |
1846 | unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); | |
1847 | ||
1848 | /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
1849 | ||
1850 | /* For bitwise operations, signedness of nominal type | |
1851 | does not matter. Consider only how operands were extended. */ | |
1852 | if (bitwise) | |
1853 | uns = unsigned0; | |
1854 | ||
1855 | /* Note that in all three cases below we refrain from optimizing | |
1856 | an unsigned operation on sign-extended args. | |
1857 | That would not be valid. */ | |
1858 | ||
1859 | /* Both args variable: if both extended in same way | |
1860 | from same width, do it in that width. | |
1861 | Do it unsigned if args were zero-extended. */ | |
1862 | if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
1863 | < TYPE_PRECISION (result_type)) | |
1864 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
1865 | == TYPE_PRECISION (TREE_TYPE (arg0))) | |
1866 | && unsigned0 == unsigned1 | |
1867 | && (unsigned0 || !uns)) | |
1868 | return c_common_signed_or_unsigned_type | |
1869 | (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
1870 | ||
1871 | else if (TREE_CODE (arg0) == INTEGER_CST | |
1872 | && (unsigned1 || !uns) | |
1873 | && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
1874 | < TYPE_PRECISION (result_type)) | |
1875 | && (type | |
1876 | = c_common_signed_or_unsigned_type (unsigned1, | |
1877 | TREE_TYPE (arg1))) | |
1878 | && !POINTER_TYPE_P (type) | |
1879 | && int_fits_type_p (arg0, type)) | |
1880 | return type; | |
1881 | ||
1882 | else if (TREE_CODE (arg1) == INTEGER_CST | |
1883 | && (unsigned0 || !uns) | |
1884 | && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
1885 | < TYPE_PRECISION (result_type)) | |
1886 | && (type | |
1887 | = c_common_signed_or_unsigned_type (unsigned0, | |
1888 | TREE_TYPE (arg0))) | |
1889 | && !POINTER_TYPE_P (type) | |
1890 | && int_fits_type_p (arg1, type)) | |
1891 | return type; | |
1892 | ||
1893 | return result_type; | |
1894 | } | |
1895 | ||
d31d55f0 | 1896 | /* Warns if the conversion of EXPR to TYPE may alter a value. |
59dd8856 | 1897 | This is a helper function for warnings_for_convert_and_check. */ |
d31d55f0 | 1898 | |
1899 | static void | |
1900 | conversion_warning (tree type, tree expr) | |
1901 | { | |
1902 | bool give_warning = false; | |
1903 | ||
5b16c152 | 1904 | int i; |
1905 | const int expr_num_operands = TREE_OPERAND_LENGTH (expr); | |
27259707 | 1906 | tree expr_type = TREE_TYPE (expr); |
d31d55f0 | 1907 | |
7ee0d227 | 1908 | if (!warn_conversion && !warn_sign_conversion) |
1909 | return; | |
1910 | ||
5b16c152 | 1911 | /* If any operand is artificial, then this expression was generated |
1912 | by the compiler and we do not warn. */ | |
1913 | for (i = 0; i < expr_num_operands; i++) | |
1914 | { | |
1915 | tree op = TREE_OPERAND (expr, i); | |
7bdc5064 | 1916 | if (op && DECL_P (op) && DECL_ARTIFICIAL (op)) |
5b16c152 | 1917 | return; |
1918 | } | |
1919 | ||
27259707 | 1920 | switch (TREE_CODE (expr)) |
d31d55f0 | 1921 | { |
27259707 | 1922 | case EQ_EXPR: |
1923 | case NE_EXPR: | |
1924 | case LE_EXPR: | |
1925 | case GE_EXPR: | |
1926 | case LT_EXPR: | |
1927 | case GT_EXPR: | |
1928 | case TRUTH_ANDIF_EXPR: | |
1929 | case TRUTH_ORIF_EXPR: | |
1930 | case TRUTH_AND_EXPR: | |
1931 | case TRUTH_OR_EXPR: | |
1932 | case TRUTH_XOR_EXPR: | |
1933 | case TRUTH_NOT_EXPR: | |
1934 | /* Conversion from boolean to a signed:1 bit-field (which only | |
1935 | can hold the values 0 and -1) doesn't lose information - but | |
1936 | it does change the value. */ | |
1937 | if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type)) | |
1938 | warning (OPT_Wconversion, | |
1939 | "conversion to %qT from boolean expression", type); | |
1940 | return; | |
1941 | ||
1942 | case REAL_CST: | |
1943 | case INTEGER_CST: | |
1944 | ||
d31d55f0 | 1945 | /* Warn for real constant that is not an exact integer converted |
1946 | to integer type. */ | |
27259707 | 1947 | if (TREE_CODE (expr_type) == REAL_TYPE |
d31d55f0 | 1948 | && TREE_CODE (type) == INTEGER_TYPE) |
1949 | { | |
27259707 | 1950 | if (!real_isinteger (TREE_REAL_CST_PTR (expr), TYPE_MODE (expr_type))) |
d31d55f0 | 1951 | give_warning = true; |
1952 | } | |
da1fb07b | 1953 | /* Warn for an integer constant that does not fit into integer type. */ |
27259707 | 1954 | else if (TREE_CODE (expr_type) == INTEGER_TYPE |
d31d55f0 | 1955 | && TREE_CODE (type) == INTEGER_TYPE |
da1fb07b | 1956 | && !int_fits_type_p (expr, type)) |
1957 | { | |
27259707 | 1958 | if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type) |
1959 | && tree_int_cst_sgn (expr) < 0) | |
7ee0d227 | 1960 | warning (OPT_Wsign_conversion, |
1961 | "negative integer implicitly converted to unsigned type"); | |
27259707 | 1962 | else if (!TYPE_UNSIGNED (type) && TYPE_UNSIGNED (expr_type)) |
1963 | warning (OPT_Wsign_conversion, "conversion of unsigned constant " | |
1964 | "value to negative integer"); | |
7ee0d227 | 1965 | else |
1966 | give_warning = true; | |
da1fb07b | 1967 | } |
d31d55f0 | 1968 | else if (TREE_CODE (type) == REAL_TYPE) |
1969 | { | |
1970 | /* Warn for an integer constant that does not fit into real type. */ | |
27259707 | 1971 | if (TREE_CODE (expr_type) == INTEGER_TYPE) |
d31d55f0 | 1972 | { |
1973 | REAL_VALUE_TYPE a = real_value_from_int_cst (0, expr); | |
1974 | if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1975 | give_warning = true; | |
1976 | } | |
1977 | /* Warn for a real constant that does not fit into a smaller | |
1978 | real type. */ | |
27259707 | 1979 | else if (TREE_CODE (expr_type) == REAL_TYPE |
1980 | && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) | |
d31d55f0 | 1981 | { |
1982 | REAL_VALUE_TYPE a = TREE_REAL_CST (expr); | |
1983 | if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1984 | give_warning = true; | |
1985 | } | |
1986 | } | |
1987 | ||
1988 | if (give_warning) | |
1989 | warning (OPT_Wconversion, | |
1990 | "conversion to %qT alters %qT constant value", | |
27259707 | 1991 | type, expr_type); |
1992 | ||
1993 | return; | |
1994 | ||
1995 | case COND_EXPR: | |
1996 | { | |
1997 | /* In case of COND_EXPR, if both operands are constants or | |
1998 | COND_EXPR, then we do not care about the type of COND_EXPR, | |
1999 | only about the conversion of each operand. */ | |
2000 | tree op1 = TREE_OPERAND (expr, 1); | |
2001 | tree op2 = TREE_OPERAND (expr, 2); | |
2002 | ||
2003 | if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST | |
2004 | || TREE_CODE (op1) == COND_EXPR) | |
2005 | && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST | |
2006 | || TREE_CODE (op2) == COND_EXPR)) | |
2007 | { | |
2008 | conversion_warning (type, op1); | |
2009 | conversion_warning (type, op2); | |
2010 | return; | |
2011 | } | |
2012 | /* Fall through. */ | |
2013 | } | |
2014 | ||
2015 | default: /* 'expr' is not a constant. */ | |
2561cea2 | 2016 | |
d31d55f0 | 2017 | /* Warn for real types converted to integer types. */ |
2561cea2 | 2018 | if (TREE_CODE (expr_type) == REAL_TYPE |
d31d55f0 | 2019 | && TREE_CODE (type) == INTEGER_TYPE) |
2020 | give_warning = true; | |
2021 | ||
2561cea2 | 2022 | else if (TREE_CODE (expr_type) == INTEGER_TYPE |
d31d55f0 | 2023 | && TREE_CODE (type) == INTEGER_TYPE) |
2024 | { | |
69609004 | 2025 | /* Don't warn about unsigned char y = 0xff, x = (int) y; */ |
f9d856a4 | 2026 | expr = get_unwidened (expr, 0); |
2561cea2 | 2027 | expr_type = TREE_TYPE (expr); |
69609004 | 2028 | |
2561cea2 | 2029 | /* Don't warn for short y; short x = ((int)y & 0xff); */ |
2030 | if (TREE_CODE (expr) == BIT_AND_EXPR | |
27259707 | 2031 | || TREE_CODE (expr) == BIT_IOR_EXPR |
2561cea2 | 2032 | || TREE_CODE (expr) == BIT_XOR_EXPR) |
2033 | { | |
27259707 | 2034 | /* If both args were extended from a shortest type, |
2035 | use that type if that is safe. */ | |
2561cea2 | 2036 | expr_type = shorten_binary_op (expr_type, |
2037 | TREE_OPERAND (expr, 0), | |
2038 | TREE_OPERAND (expr, 1), | |
2039 | /* bitwise */1); | |
2040 | ||
2561cea2 | 2041 | if (TREE_CODE (expr) == BIT_AND_EXPR) |
2042 | { | |
2043 | tree op0 = TREE_OPERAND (expr, 0); | |
2044 | tree op1 = TREE_OPERAND (expr, 1); | |
30de145b | 2045 | bool unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
2046 | bool unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); | |
2047 | ||
2048 | /* If one of the operands is a non-negative constant | |
2049 | that fits in the target type, then the type of the | |
2050 | other operand does not matter. */ | |
2561cea2 | 2051 | if ((TREE_CODE (op0) == INTEGER_CST |
2052 | && int_fits_type_p (op0, c_common_signed_type (type)) | |
2053 | && int_fits_type_p (op0, c_common_unsigned_type (type))) | |
2054 | || (TREE_CODE (op1) == INTEGER_CST | |
27259707 | 2055 | && int_fits_type_p (op1, c_common_signed_type (type)) |
2056 | && int_fits_type_p (op1, | |
2057 | c_common_unsigned_type (type)))) | |
2561cea2 | 2058 | return; |
30de145b | 2059 | /* If constant is unsigned and fits in the target |
2060 | type, then the result will also fit. */ | |
2061 | else if ((TREE_CODE (op0) == INTEGER_CST | |
2062 | && unsigned0 | |
2063 | && int_fits_type_p (op0, type)) | |
2064 | || (TREE_CODE (op1) == INTEGER_CST | |
2065 | && unsigned1 | |
2066 | && int_fits_type_p (op1, type))) | |
2067 | return; | |
2561cea2 | 2068 | } |
2069 | } | |
d31d55f0 | 2070 | /* Warn for integer types converted to smaller integer types. */ |
27259707 | 2071 | if (TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) |
7ee0d227 | 2072 | give_warning = true; |
2073 | ||
2074 | /* When they are the same width but different signedness, | |
2075 | then the value may change. */ | |
27259707 | 2076 | else if ((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type) |
2561cea2 | 2077 | && TYPE_UNSIGNED (expr_type) != TYPE_UNSIGNED (type)) |
7ee0d227 | 2078 | /* Even when converted to a bigger type, if the type is |
2079 | unsigned but expr is signed, then negative values | |
2080 | will be changed. */ | |
2561cea2 | 2081 | || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type))) |
27259707 | 2082 | warning (OPT_Wsign_conversion, "conversion to %qT from %qT " |
2083 | "may change the sign of the result", | |
2561cea2 | 2084 | type, expr_type); |
d31d55f0 | 2085 | } |
2086 | ||
2087 | /* Warn for integer types converted to real types if and only if | |
2088 | all the range of values of the integer type cannot be | |
2089 | represented by the real type. */ | |
2561cea2 | 2090 | else if (TREE_CODE (expr_type) == INTEGER_TYPE |
d31d55f0 | 2091 | && TREE_CODE (type) == REAL_TYPE) |
2092 | { | |
2561cea2 | 2093 | tree type_low_bound = TYPE_MIN_VALUE (expr_type); |
2094 | tree type_high_bound = TYPE_MAX_VALUE (expr_type); | |
27259707 | 2095 | REAL_VALUE_TYPE real_low_bound |
2096 | = real_value_from_int_cst (0, type_low_bound); | |
2097 | REAL_VALUE_TYPE real_high_bound | |
2098 | = real_value_from_int_cst (0, type_high_bound); | |
d31d55f0 | 2099 | |
2100 | if (!exact_real_truncate (TYPE_MODE (type), &real_low_bound) | |
2101 | || !exact_real_truncate (TYPE_MODE (type), &real_high_bound)) | |
2102 | give_warning = true; | |
2103 | } | |
2104 | ||
2105 | /* Warn for real types converted to smaller real types. */ | |
2561cea2 | 2106 | else if (TREE_CODE (expr_type) == REAL_TYPE |
d31d55f0 | 2107 | && TREE_CODE (type) == REAL_TYPE |
27259707 | 2108 | && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) |
d31d55f0 | 2109 | give_warning = true; |
2110 | ||
2111 | ||
2112 | if (give_warning) | |
2113 | warning (OPT_Wconversion, | |
2114 | "conversion to %qT from %qT may alter its value", | |
2561cea2 | 2115 | type, expr_type); |
d31d55f0 | 2116 | } |
2117 | } | |
2118 | ||
59dd8856 | 2119 | /* Produce warnings after a conversion. RESULT is the result of |
2120 | converting EXPR to TYPE. This is a helper function for | |
2121 | convert_and_check and cp_convert_and_check. */ | |
2a1736ed | 2122 | |
59dd8856 | 2123 | void |
2124 | warnings_for_convert_and_check (tree type, tree expr, tree result) | |
2a1736ed | 2125 | { |
da1fb07b | 2126 | if (TREE_CODE (expr) == INTEGER_CST |
2127 | && (TREE_CODE (type) == INTEGER_TYPE | |
2128 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
2129 | && !int_fits_type_p (expr, type)) | |
2130 | { | |
d31d55f0 | 2131 | /* Do not diagnose overflow in a constant expression merely |
2132 | because a conversion overflowed. */ | |
da1fb07b | 2133 | if (TREE_OVERFLOW (result)) |
eddad94a | 2134 | TREE_OVERFLOW (result) = TREE_OVERFLOW (expr); |
2135 | ||
da1fb07b | 2136 | if (TYPE_UNSIGNED (type)) |
d31d55f0 | 2137 | { |
da1fb07b | 2138 | /* This detects cases like converting -129 or 256 to |
2139 | unsigned char. */ | |
2140 | if (!int_fits_type_p (expr, c_common_signed_type (type))) | |
2141 | warning (OPT_Woverflow, | |
2142 | "large integer implicitly truncated to unsigned type"); | |
7ee0d227 | 2143 | else |
da1fb07b | 2144 | conversion_warning (type, expr); |
2145 | } | |
11773141 | 2146 | else if (!int_fits_type_p (expr, c_common_unsigned_type (type))) |
e0913805 | 2147 | warning (OPT_Woverflow, |
2148 | "overflow in implicit constant conversion"); | |
2149 | /* No warning for converting 0x80000000 to int. */ | |
2150 | else if (pedantic | |
2151 | && (TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE | |
2152 | || TYPE_PRECISION (TREE_TYPE (expr)) | |
2153 | != TYPE_PRECISION (type))) | |
2154 | warning (OPT_Woverflow, | |
2155 | "overflow in implicit constant conversion"); | |
2156 | ||
7ee0d227 | 2157 | else |
e0913805 | 2158 | conversion_warning (type, expr); |
2a1736ed | 2159 | } |
9421ebb9 | 2160 | else if ((TREE_CODE (result) == INTEGER_CST |
2161 | || TREE_CODE (result) == FIXED_CST) && TREE_OVERFLOW (result)) | |
da1fb07b | 2162 | warning (OPT_Woverflow, |
2163 | "overflow in implicit constant conversion"); | |
7ee0d227 | 2164 | else |
da1fb07b | 2165 | conversion_warning (type, expr); |
59dd8856 | 2166 | } |
2167 | ||
2168 | ||
2169 | /* Convert EXPR to TYPE, warning about conversion problems with constants. | |
2170 | Invoke this function on every expression that is converted implicitly, | |
2171 | i.e. because of language rules and not because of an explicit cast. */ | |
2172 | ||
2173 | tree | |
2174 | convert_and_check (tree type, tree expr) | |
2175 | { | |
2176 | tree result; | |
2177 | ||
2178 | if (TREE_TYPE (expr) == type) | |
2179 | return expr; | |
da1fb07b | 2180 | |
59dd8856 | 2181 | result = convert (type, expr); |
2182 | ||
7ee0d227 | 2183 | if (!skip_evaluation && !TREE_OVERFLOW_P (expr) && result != error_mark_node) |
59dd8856 | 2184 | warnings_for_convert_and_check (type, expr, result); |
2185 | ||
da1fb07b | 2186 | return result; |
b2806639 | 2187 | } |
2188 | \f | |
4e91a871 | 2189 | /* A node in a list that describes references to variables (EXPR), which are |
2190 | either read accesses if WRITER is zero, or write accesses, in which case | |
2191 | WRITER is the parent of EXPR. */ | |
2192 | struct tlist | |
2193 | { | |
2194 | struct tlist *next; | |
2195 | tree expr, writer; | |
2196 | }; | |
2197 | ||
2198 | /* Used to implement a cache the results of a call to verify_tree. We only | |
2199 | use this for SAVE_EXPRs. */ | |
2200 | struct tlist_cache | |
2201 | { | |
2202 | struct tlist_cache *next; | |
2203 | struct tlist *cache_before_sp; | |
2204 | struct tlist *cache_after_sp; | |
2205 | tree expr; | |
481c6ce6 | 2206 | }; |
2207 | ||
4e91a871 | 2208 | /* Obstack to use when allocating tlist structures, and corresponding |
2209 | firstobj. */ | |
2210 | static struct obstack tlist_obstack; | |
2211 | static char *tlist_firstobj = 0; | |
2212 | ||
2213 | /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
2214 | warnings. */ | |
2215 | static struct tlist *warned_ids; | |
2216 | /* SAVE_EXPRs need special treatment. We process them only once and then | |
2217 | cache the results. */ | |
2218 | static struct tlist_cache *save_expr_cache; | |
2219 | ||
1cae46be | 2220 | static void add_tlist (struct tlist **, struct tlist *, tree, int); |
2221 | static void merge_tlist (struct tlist **, struct tlist *, int); | |
2222 | static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
2223 | static int warning_candidate_p (tree); | |
2224 | static void warn_for_collisions (struct tlist *); | |
2225 | static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
2226 | static struct tlist *new_tlist (struct tlist *, tree, tree); | |
481c6ce6 | 2227 | |
4e91a871 | 2228 | /* Create a new struct tlist and fill in its fields. */ |
2229 | static struct tlist * | |
1cae46be | 2230 | new_tlist (struct tlist *next, tree t, tree writer) |
4e91a871 | 2231 | { |
2232 | struct tlist *l; | |
9318f22c | 2233 | l = XOBNEW (&tlist_obstack, struct tlist); |
4e91a871 | 2234 | l->next = next; |
2235 | l->expr = t; | |
2236 | l->writer = writer; | |
2237 | return l; | |
2238 | } | |
2239 | ||
2240 | /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
2241 | is nonnull, we ignore any node we find which has a writer equal to it. */ | |
2242 | ||
2243 | static void | |
1cae46be | 2244 | add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) |
4e91a871 | 2245 | { |
2246 | while (add) | |
2247 | { | |
2248 | struct tlist *next = add->next; | |
84166705 | 2249 | if (!copy) |
4e91a871 | 2250 | add->next = *to; |
84166705 | 2251 | if (!exclude_writer || add->writer != exclude_writer) |
4e91a871 | 2252 | *to = copy ? new_tlist (*to, add->expr, add->writer) : add; |
2253 | add = next; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | /* Merge the nodes of ADD into TO. This merging process is done so that for | |
2258 | each variable that already exists in TO, no new node is added; however if | |
2259 | there is a write access recorded in ADD, and an occurrence on TO is only | |
2260 | a read access, then the occurrence in TO will be modified to record the | |
2261 | write. */ | |
481c6ce6 | 2262 | |
2263 | static void | |
1cae46be | 2264 | merge_tlist (struct tlist **to, struct tlist *add, int copy) |
4e91a871 | 2265 | { |
2266 | struct tlist **end = to; | |
2267 | ||
2268 | while (*end) | |
2269 | end = &(*end)->next; | |
2270 | ||
2271 | while (add) | |
2272 | { | |
2273 | int found = 0; | |
2274 | struct tlist *tmp2; | |
2275 | struct tlist *next = add->next; | |
2276 | ||
2277 | for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
2278 | if (tmp2->expr == add->expr) | |
2279 | { | |
2280 | found = 1; | |
84166705 | 2281 | if (!tmp2->writer) |
4e91a871 | 2282 | tmp2->writer = add->writer; |
2283 | } | |
84166705 | 2284 | if (!found) |
4e91a871 | 2285 | { |
2286 | *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
2287 | end = &(*end)->next; | |
2288 | *end = 0; | |
2289 | } | |
2290 | add = next; | |
2291 | } | |
2292 | } | |
2293 | ||
2294 | /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
2295 | references in list LIST conflict with it, excluding reads if ONLY writers | |
2296 | is nonzero. */ | |
2297 | ||
2298 | static void | |
1cae46be | 2299 | warn_for_collisions_1 (tree written, tree writer, struct tlist *list, |
2300 | int only_writes) | |
4e91a871 | 2301 | { |
2302 | struct tlist *tmp; | |
2303 | ||
2304 | /* Avoid duplicate warnings. */ | |
2305 | for (tmp = warned_ids; tmp; tmp = tmp->next) | |
2306 | if (tmp->expr == written) | |
2307 | return; | |
2308 | ||
2309 | while (list) | |
2310 | { | |
2311 | if (list->expr == written | |
2312 | && list->writer != writer | |
84166705 | 2313 | && (!only_writes || list->writer) |
e4323659 | 2314 | && DECL_NAME (list->expr)) |
4e91a871 | 2315 | { |
2316 | warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
6513b50d | 2317 | warning_at (EXPR_HAS_LOCATION (writer) |
2318 | ? EXPR_LOCATION (writer) : input_location, | |
2319 | OPT_Wsequence_point, "operation on %qE may be undefined", | |
2320 | list->expr); | |
4e91a871 | 2321 | } |
2322 | list = list->next; | |
2323 | } | |
2324 | } | |
2325 | ||
2326 | /* Given a list LIST of references to variables, find whether any of these | |
2327 | can cause conflicts due to missing sequence points. */ | |
2328 | ||
2329 | static void | |
1cae46be | 2330 | warn_for_collisions (struct tlist *list) |
4e91a871 | 2331 | { |
2332 | struct tlist *tmp; | |
1cae46be | 2333 | |
4e91a871 | 2334 | for (tmp = list; tmp; tmp = tmp->next) |
2335 | { | |
2336 | if (tmp->writer) | |
2337 | warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
2338 | } | |
2339 | } | |
2340 | ||
734c98be | 2341 | /* Return nonzero if X is a tree that can be verified by the sequence point |
4e91a871 | 2342 | warnings. */ |
2343 | static int | |
1cae46be | 2344 | warning_candidate_p (tree x) |
481c6ce6 | 2345 | { |
4e91a871 | 2346 | return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL; |
2347 | } | |
481c6ce6 | 2348 | |
4e91a871 | 2349 | /* Walk the tree X, and record accesses to variables. If X is written by the |
2350 | parent tree, WRITER is the parent. | |
2351 | We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
2352 | expression or its only operand forces a sequence point, then everything up | |
2353 | to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
2354 | in PNO_SP. | |
2355 | Once we return, we will have emitted warnings if any subexpression before | |
2356 | such a sequence point could be undefined. On a higher level, however, the | |
2357 | sequence point may not be relevant, and we'll merge the two lists. | |
2358 | ||
2359 | Example: (b++, a) + b; | |
2360 | The call that processes the COMPOUND_EXPR will store the increment of B | |
2361 | in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
2362 | processes the PLUS_EXPR will need to merge the two lists so that | |
2363 | eventually, all accesses end up on the same list (and we'll warn about the | |
2364 | unordered subexpressions b++ and b. | |
2365 | ||
2366 | A note on merging. If we modify the former example so that our expression | |
2367 | becomes | |
2368 | (b++, b) + a | |
2369 | care must be taken not simply to add all three expressions into the final | |
2370 | PNO_SP list. The function merge_tlist takes care of that by merging the | |
2371 | before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
2372 | way, so that no more than one access to B is recorded. */ | |
481c6ce6 | 2373 | |
4e91a871 | 2374 | static void |
1cae46be | 2375 | verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, |
2376 | tree writer) | |
4e91a871 | 2377 | { |
2378 | struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
2379 | enum tree_code code; | |
ce45a448 | 2380 | enum tree_code_class cl; |
481c6ce6 | 2381 | |
e5b75768 | 2382 | /* X may be NULL if it is the operand of an empty statement expression |
2383 | ({ }). */ | |
2384 | if (x == NULL) | |
2385 | return; | |
2386 | ||
4e91a871 | 2387 | restart: |
2388 | code = TREE_CODE (x); | |
e916c70c | 2389 | cl = TREE_CODE_CLASS (code); |
481c6ce6 | 2390 | |
4e91a871 | 2391 | if (warning_candidate_p (x)) |
481c6ce6 | 2392 | { |
4e91a871 | 2393 | *pno_sp = new_tlist (*pno_sp, x, writer); |
2394 | return; | |
2395 | } | |
2396 | ||
2397 | switch (code) | |
2398 | { | |
67b28e3e | 2399 | case CONSTRUCTOR: |
2400 | return; | |
2401 | ||
4e91a871 | 2402 | case COMPOUND_EXPR: |
2403 | case TRUTH_ANDIF_EXPR: | |
2404 | case TRUTH_ORIF_EXPR: | |
2405 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
2406 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
2407 | warn_for_collisions (tmp_nosp); | |
2408 | merge_tlist (pbefore_sp, tmp_before, 0); | |
2409 | merge_tlist (pbefore_sp, tmp_nosp, 0); | |
2410 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
2411 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
2412 | return; | |
2413 | ||
2414 | case COND_EXPR: | |
2415 | tmp_before = tmp_list2 = 0; | |
2416 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
2417 | warn_for_collisions (tmp_list2); | |
2418 | merge_tlist (pbefore_sp, tmp_before, 0); | |
2419 | merge_tlist (pbefore_sp, tmp_list2, 1); | |
2420 | ||
2421 | tmp_list3 = tmp_nosp = 0; | |
2422 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
2423 | warn_for_collisions (tmp_nosp); | |
2424 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
2425 | ||
2426 | tmp_list3 = tmp_list2 = 0; | |
2427 | verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
2428 | warn_for_collisions (tmp_list2); | |
2429 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
2430 | /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
2431 | two first, to avoid warning for (a ? b++ : b++). */ | |
2432 | merge_tlist (&tmp_nosp, tmp_list2, 0); | |
2433 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2434 | return; | |
2435 | ||
481c6ce6 | 2436 | case PREDECREMENT_EXPR: |
2437 | case PREINCREMENT_EXPR: | |
2438 | case POSTDECREMENT_EXPR: | |
2439 | case POSTINCREMENT_EXPR: | |
4e91a871 | 2440 | verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); |
2441 | return; | |
2442 | ||
2443 | case MODIFY_EXPR: | |
2444 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
2445 | verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
2446 | verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
2447 | /* Expressions inside the LHS are not ordered wrt. the sequence points | |
2448 | in the RHS. Example: | |
2449 | *a = (a++, 2) | |
2450 | Despite the fact that the modification of "a" is in the before_sp | |
2451 | list (tmp_before), it conflicts with the use of "a" in the LHS. | |
2452 | We can handle this by adding the contents of tmp_list3 | |
2453 | to those of tmp_before, and redoing the collision warnings for that | |
2454 | list. */ | |
2455 | add_tlist (&tmp_before, tmp_list3, x, 1); | |
2456 | warn_for_collisions (tmp_before); | |
2457 | /* Exclude the LHS itself here; we first have to merge it into the | |
2458 | tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
2459 | didn't exclude the LHS, we'd get it twice, once as a read and once | |
2460 | as a write. */ | |
2461 | add_tlist (pno_sp, tmp_list3, x, 0); | |
2462 | warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
2463 | ||
2464 | merge_tlist (pbefore_sp, tmp_before, 0); | |
2465 | if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
2466 | merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
2467 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
2468 | return; | |
481c6ce6 | 2469 | |
2470 | case CALL_EXPR: | |
4e91a871 | 2471 | /* We need to warn about conflicts among arguments and conflicts between |
2472 | args and the function address. Side effects of the function address, | |
2473 | however, are not ordered by the sequence point of the call. */ | |
c2f47e15 | 2474 | { |
2475 | call_expr_arg_iterator iter; | |
2476 | tree arg; | |
2477 | tmp_before = tmp_nosp = 0; | |
2478 | verify_tree (CALL_EXPR_FN (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
2479 | FOR_EACH_CALL_EXPR_ARG (arg, iter, x) | |
2480 | { | |
2481 | tmp_list2 = tmp_list3 = 0; | |
2482 | verify_tree (arg, &tmp_list2, &tmp_list3, NULL_TREE); | |
2483 | merge_tlist (&tmp_list3, tmp_list2, 0); | |
2484 | add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
2485 | } | |
2486 | add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
2487 | warn_for_collisions (tmp_before); | |
2488 | add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
2489 | return; | |
2490 | } | |
481c6ce6 | 2491 | |
2492 | case TREE_LIST: | |
2493 | /* Scan all the list, e.g. indices of multi dimensional array. */ | |
2494 | while (x) | |
2495 | { | |
4e91a871 | 2496 | tmp_before = tmp_nosp = 0; |
2497 | verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
2498 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
2499 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
481c6ce6 | 2500 | x = TREE_CHAIN (x); |
2501 | } | |
4e91a871 | 2502 | return; |
481c6ce6 | 2503 | |
4e91a871 | 2504 | case SAVE_EXPR: |
2505 | { | |
2506 | struct tlist_cache *t; | |
2507 | for (t = save_expr_cache; t; t = t->next) | |
2508 | if (t->expr == x) | |
2509 | break; | |
481c6ce6 | 2510 | |
84166705 | 2511 | if (!t) |
481c6ce6 | 2512 | { |
9318f22c | 2513 | t = XOBNEW (&tlist_obstack, struct tlist_cache); |
4e91a871 | 2514 | t->next = save_expr_cache; |
2515 | t->expr = x; | |
2516 | save_expr_cache = t; | |
2517 | ||
2518 | tmp_before = tmp_nosp = 0; | |
2519 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
2520 | warn_for_collisions (tmp_nosp); | |
2521 | ||
2522 | tmp_list3 = 0; | |
2523 | while (tmp_nosp) | |
2524 | { | |
2525 | struct tlist *t = tmp_nosp; | |
2526 | tmp_nosp = t->next; | |
2527 | merge_tlist (&tmp_list3, t, 0); | |
2528 | } | |
2529 | t->cache_before_sp = tmp_before; | |
2530 | t->cache_after_sp = tmp_list3; | |
481c6ce6 | 2531 | } |
4e91a871 | 2532 | merge_tlist (pbefore_sp, t->cache_before_sp, 1); |
2533 | add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
2534 | return; | |
2535 | } | |
481c6ce6 | 2536 | |
012916cb | 2537 | case ADDR_EXPR: |
2538 | x = TREE_OPERAND (x, 0); | |
2539 | if (DECL_P (x)) | |
2540 | return; | |
2541 | writer = 0; | |
2542 | goto restart; | |
2543 | ||
ce45a448 | 2544 | default: |
2545 | /* For other expressions, simply recurse on their operands. | |
a0c938f0 | 2546 | Manual tail recursion for unary expressions. |
ce45a448 | 2547 | Other non-expressions need not be processed. */ |
2548 | if (cl == tcc_unary) | |
2549 | { | |
ce45a448 | 2550 | x = TREE_OPERAND (x, 0); |
2551 | writer = 0; | |
2552 | goto restart; | |
2553 | } | |
2554 | else if (IS_EXPR_CODE_CLASS (cl)) | |
2555 | { | |
2556 | int lp; | |
c2f47e15 | 2557 | int max = TREE_OPERAND_LENGTH (x); |
ce45a448 | 2558 | for (lp = 0; lp < max; lp++) |
2559 | { | |
2560 | tmp_before = tmp_nosp = 0; | |
2561 | verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0); | |
2562 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
2563 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2564 | } | |
2565 | } | |
2566 | return; | |
481c6ce6 | 2567 | } |
481c6ce6 | 2568 | } |
2569 | ||
974e2c0c | 2570 | /* Try to warn for undefined behavior in EXPR due to missing sequence |
481c6ce6 | 2571 | points. */ |
2572 | ||
2569a1be | 2573 | void |
1cae46be | 2574 | verify_sequence_points (tree expr) |
481c6ce6 | 2575 | { |
4e91a871 | 2576 | struct tlist *before_sp = 0, *after_sp = 0; |
481c6ce6 | 2577 | |
4e91a871 | 2578 | warned_ids = 0; |
2579 | save_expr_cache = 0; | |
2580 | if (tlist_firstobj == 0) | |
481c6ce6 | 2581 | { |
4e91a871 | 2582 | gcc_obstack_init (&tlist_obstack); |
4fd61bc6 | 2583 | tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0); |
481c6ce6 | 2584 | } |
2585 | ||
4e91a871 | 2586 | verify_tree (expr, &before_sp, &after_sp, 0); |
2587 | warn_for_collisions (after_sp); | |
2588 | obstack_free (&tlist_obstack, tlist_firstobj); | |
481c6ce6 | 2589 | } |
b0fc3e72 | 2590 | \f |
2591 | /* Validate the expression after `case' and apply default promotions. */ | |
2592 | ||
2ca392fd | 2593 | static tree |
1cae46be | 2594 | check_case_value (tree value) |
b0fc3e72 | 2595 | { |
2596 | if (value == NULL_TREE) | |
2597 | return value; | |
2598 | ||
a97c952c | 2599 | /* ??? Can we ever get nops here for a valid case value? We |
2600 | shouldn't for C. */ | |
fce1d6af | 2601 | STRIP_TYPE_NOPS (value); |
225ec6aa | 2602 | /* In C++, the following is allowed: |
2603 | ||
2604 | const int i = 3; | |
2605 | switch (...) { case i: ... } | |
2606 | ||
2607 | So, we try to reduce the VALUE to a constant that way. */ | |
c0f19401 | 2608 | if (c_dialect_cxx ()) |
225ec6aa | 2609 | { |
2610 | value = decl_constant_value (value); | |
2611 | STRIP_TYPE_NOPS (value); | |
2612 | value = fold (value); | |
2613 | } | |
b0fc3e72 | 2614 | |
b96dc121 | 2615 | if (TREE_CODE (value) == INTEGER_CST) |
2616 | /* Promote char or short to int. */ | |
2617 | value = perform_integral_promotions (value); | |
2618 | else if (value != error_mark_node) | |
b0fc3e72 | 2619 | { |
2620 | error ("case label does not reduce to an integer constant"); | |
2621 | value = error_mark_node; | |
2622 | } | |
b0fc3e72 | 2623 | |
6433f1c2 | 2624 | constant_expression_warning (value); |
2625 | ||
b0fc3e72 | 2626 | return value; |
2627 | } | |
2628 | \f | |
2ca392fd | 2629 | /* See if the case values LOW and HIGH are in the range of the original |
5c9dae64 | 2630 | type (i.e. before the default conversion to int) of the switch testing |
2ca392fd | 2631 | expression. |
2632 | TYPE is the promoted type of the testing expression, and ORIG_TYPE is | |
91275768 | 2633 | the type before promoting it. CASE_LOW_P is a pointer to the lower |
2ca392fd | 2634 | bound of the case label, and CASE_HIGH_P is the upper bound or NULL |
2635 | if the case is not a case range. | |
2636 | The caller has to make sure that we are not called with NULL for | |
5c9dae64 | 2637 | CASE_LOW_P (i.e. the default case). |
442e3cb9 | 2638 | Returns true if the case label is in range of ORIG_TYPE (saturated or |
2ca392fd | 2639 | untouched) or false if the label is out of range. */ |
2640 | ||
2641 | static bool | |
2642 | check_case_bounds (tree type, tree orig_type, | |
2643 | tree *case_low_p, tree *case_high_p) | |
2644 | { | |
2645 | tree min_value, max_value; | |
2646 | tree case_low = *case_low_p; | |
2647 | tree case_high = case_high_p ? *case_high_p : case_low; | |
2648 | ||
2649 | /* If there was a problem with the original type, do nothing. */ | |
2650 | if (orig_type == error_mark_node) | |
2651 | return true; | |
2652 | ||
2653 | min_value = TYPE_MIN_VALUE (orig_type); | |
2654 | max_value = TYPE_MAX_VALUE (orig_type); | |
2655 | ||
2656 | /* Case label is less than minimum for type. */ | |
2657 | if (tree_int_cst_compare (case_low, min_value) < 0 | |
2658 | && tree_int_cst_compare (case_high, min_value) < 0) | |
2659 | { | |
c3ceba8e | 2660 | warning (0, "case label value is less than minimum value for type"); |
2ca392fd | 2661 | return false; |
2662 | } | |
b27ac6b5 | 2663 | |
2ca392fd | 2664 | /* Case value is greater than maximum for type. */ |
2665 | if (tree_int_cst_compare (case_low, max_value) > 0 | |
2666 | && tree_int_cst_compare (case_high, max_value) > 0) | |
2667 | { | |
c3ceba8e | 2668 | warning (0, "case label value exceeds maximum value for type"); |
2ca392fd | 2669 | return false; |
2670 | } | |
2671 | ||
2672 | /* Saturate lower case label value to minimum. */ | |
2673 | if (tree_int_cst_compare (case_high, min_value) >= 0 | |
2674 | && tree_int_cst_compare (case_low, min_value) < 0) | |
2675 | { | |
c3ceba8e | 2676 | warning (0, "lower value in case label range" |
2ca392fd | 2677 | " less than minimum value for type"); |
2678 | case_low = min_value; | |
2679 | } | |
b27ac6b5 | 2680 | |
2ca392fd | 2681 | /* Saturate upper case label value to maximum. */ |
2682 | if (tree_int_cst_compare (case_low, max_value) <= 0 | |
2683 | && tree_int_cst_compare (case_high, max_value) > 0) | |
2684 | { | |
c3ceba8e | 2685 | warning (0, "upper value in case label range" |
2ca392fd | 2686 | " exceeds maximum value for type"); |
2687 | case_high = max_value; | |
2688 | } | |
2689 | ||
2690 | if (*case_low_p != case_low) | |
2691 | *case_low_p = convert (type, case_low); | |
2692 | if (case_high_p && *case_high_p != case_high) | |
2693 | *case_high_p = convert (type, case_high); | |
2694 | ||
2695 | return true; | |
2696 | } | |
2697 | \f | |
b0fc3e72 | 2698 | /* Return an integer type with BITS bits of precision, |
2699 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
2700 | ||
2701 | tree | |
1cae46be | 2702 | c_common_type_for_size (unsigned int bits, int unsignedp) |
b0fc3e72 | 2703 | { |
46375237 | 2704 | if (bits == TYPE_PRECISION (integer_type_node)) |
2705 | return unsignedp ? unsigned_type_node : integer_type_node; | |
2706 | ||
bacde65a | 2707 | if (bits == TYPE_PRECISION (signed_char_type_node)) |
b0fc3e72 | 2708 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
2709 | ||
bacde65a | 2710 | if (bits == TYPE_PRECISION (short_integer_type_node)) |
b0fc3e72 | 2711 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
2712 | ||
bacde65a | 2713 | if (bits == TYPE_PRECISION (long_integer_type_node)) |
b0fc3e72 | 2714 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
2715 | ||
bacde65a | 2716 | if (bits == TYPE_PRECISION (long_long_integer_type_node)) |
b0fc3e72 | 2717 | return (unsignedp ? long_long_unsigned_type_node |
2718 | : long_long_integer_type_node); | |
2719 | ||
f57fa2ea | 2720 | if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) |
2721 | return (unsignedp ? widest_unsigned_literal_type_node | |
2722 | : widest_integer_literal_type_node); | |
2723 | ||
bacde65a | 2724 | if (bits <= TYPE_PRECISION (intQI_type_node)) |
2725 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
2726 | ||
2727 | if (bits <= TYPE_PRECISION (intHI_type_node)) | |
2728 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
2729 | ||
2730 | if (bits <= TYPE_PRECISION (intSI_type_node)) | |
2731 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
2732 | ||
2733 | if (bits <= TYPE_PRECISION (intDI_type_node)) | |
2734 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
2735 | ||
b0fc3e72 | 2736 | return 0; |
2737 | } | |
2738 | ||
9421ebb9 | 2739 | /* Return a fixed-point type that has at least IBIT ibits and FBIT fbits |
2740 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed; | |
2741 | and saturating if SATP is nonzero, otherwise not saturating. */ | |
2742 | ||
2743 | tree | |
2744 | c_common_fixed_point_type_for_size (unsigned int ibit, unsigned int fbit, | |
2745 | int unsignedp, int satp) | |
2746 | { | |
2747 | enum machine_mode mode; | |
2748 | if (ibit == 0) | |
2749 | mode = unsignedp ? UQQmode : QQmode; | |
2750 | else | |
2751 | mode = unsignedp ? UHAmode : HAmode; | |
2752 | ||
2753 | for (; mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode)) | |
2754 | if (GET_MODE_IBIT (mode) >= ibit && GET_MODE_FBIT (mode) >= fbit) | |
2755 | break; | |
2756 | ||
2757 | if (mode == VOIDmode || !targetm.scalar_mode_supported_p (mode)) | |
2758 | { | |
2759 | sorry ("GCC cannot support operators with integer types and " | |
2760 | "fixed-point types that have too many integral and " | |
2761 | "fractional bits together"); | |
2762 | return 0; | |
2763 | } | |
2764 | ||
2765 | return c_common_type_for_mode (mode, satp); | |
2766 | } | |
2767 | ||
5b247e9f | 2768 | /* Used for communication between c_common_type_for_mode and |
2769 | c_register_builtin_type. */ | |
2770 | static GTY(()) tree registered_builtin_types; | |
2771 | ||
b0fc3e72 | 2772 | /* Return a data type that has machine mode MODE. |
2773 | If the mode is an integer, | |
9421ebb9 | 2774 | then UNSIGNEDP selects between signed and unsigned types. |
2775 | If the mode is a fixed-point mode, | |
2776 | then UNSIGNEDP selects between saturating and nonsaturating types. */ | |
b0fc3e72 | 2777 | |
2778 | tree | |
1cae46be | 2779 | c_common_type_for_mode (enum machine_mode mode, int unsignedp) |
b0fc3e72 | 2780 | { |
5b247e9f | 2781 | tree t; |
2782 | ||
46375237 | 2783 | if (mode == TYPE_MODE (integer_type_node)) |
2784 | return unsignedp ? unsigned_type_node : integer_type_node; | |
2785 | ||
b0fc3e72 | 2786 | if (mode == TYPE_MODE (signed_char_type_node)) |
2787 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
2788 | ||
2789 | if (mode == TYPE_MODE (short_integer_type_node)) | |
2790 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
2791 | ||
b0fc3e72 | 2792 | if (mode == TYPE_MODE (long_integer_type_node)) |
2793 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
2794 | ||
2795 | if (mode == TYPE_MODE (long_long_integer_type_node)) | |
2796 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
2797 | ||
f57fa2ea | 2798 | if (mode == TYPE_MODE (widest_integer_literal_type_node)) |
44e9fa65 | 2799 | return unsignedp ? widest_unsigned_literal_type_node |
4ee9c684 | 2800 | : widest_integer_literal_type_node; |
f57fa2ea | 2801 | |
88ae7f04 | 2802 | if (mode == QImode) |
bacde65a | 2803 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
2804 | ||
88ae7f04 | 2805 | if (mode == HImode) |
bacde65a | 2806 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
2807 | ||
88ae7f04 | 2808 | if (mode == SImode) |
bacde65a | 2809 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
2810 | ||
88ae7f04 | 2811 | if (mode == DImode) |
bacde65a | 2812 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
2813 | ||
cc1cc1c7 | 2814 | #if HOST_BITS_PER_WIDE_INT >= 64 |
6274009c | 2815 | if (mode == TYPE_MODE (intTI_type_node)) |
2816 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
cc1cc1c7 | 2817 | #endif |
6274009c | 2818 | |
b0fc3e72 | 2819 | if (mode == TYPE_MODE (float_type_node)) |
2820 | return float_type_node; | |
2821 | ||
2822 | if (mode == TYPE_MODE (double_type_node)) | |
2823 | return double_type_node; | |
2824 | ||
2825 | if (mode == TYPE_MODE (long_double_type_node)) | |
2826 | return long_double_type_node; | |
2827 | ||
545c2bde | 2828 | if (mode == TYPE_MODE (void_type_node)) |
2829 | return void_type_node; | |
b27ac6b5 | 2830 | |
b0fc3e72 | 2831 | if (mode == TYPE_MODE (build_pointer_type (char_type_node))) |
61b9b73c | 2832 | return (unsignedp |
2833 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
2834 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b0fc3e72 | 2835 | |
2836 | if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
61b9b73c | 2837 | return (unsignedp |
2838 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
2839 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b0fc3e72 | 2840 | |
0dfc45b5 | 2841 | if (COMPLEX_MODE_P (mode)) |
2842 | { | |
2843 | enum machine_mode inner_mode; | |
2844 | tree inner_type; | |
2845 | ||
2846 | if (mode == TYPE_MODE (complex_float_type_node)) | |
2847 | return complex_float_type_node; | |
2848 | if (mode == TYPE_MODE (complex_double_type_node)) | |
2849 | return complex_double_type_node; | |
2850 | if (mode == TYPE_MODE (complex_long_double_type_node)) | |
2851 | return complex_long_double_type_node; | |
2852 | ||
2853 | if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp) | |
2854 | return complex_integer_type_node; | |
2855 | ||
2856 | inner_mode = GET_MODE_INNER (mode); | |
2857 | inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
2858 | if (inner_type != NULL_TREE) | |
2859 | return build_complex_type (inner_type); | |
2860 | } | |
2861 | else if (VECTOR_MODE_P (mode)) | |
4917c376 | 2862 | { |
2863 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
2864 | tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
2865 | if (inner_type != NULL_TREE) | |
2866 | return build_vector_type_for_mode (inner_type, mode); | |
88ae7f04 | 2867 | } |
e2ea7e3a | 2868 | |
c4503c0a | 2869 | if (mode == TYPE_MODE (dfloat32_type_node)) |
2870 | return dfloat32_type_node; | |
2871 | if (mode == TYPE_MODE (dfloat64_type_node)) | |
2872 | return dfloat64_type_node; | |
2873 | if (mode == TYPE_MODE (dfloat128_type_node)) | |
2874 | return dfloat128_type_node; | |
2875 | ||
9421ebb9 | 2876 | if (ALL_SCALAR_FIXED_POINT_MODE_P (mode)) |
2877 | { | |
2878 | if (mode == TYPE_MODE (short_fract_type_node)) | |
2879 | return unsignedp ? sat_short_fract_type_node : short_fract_type_node; | |
2880 | if (mode == TYPE_MODE (fract_type_node)) | |
2881 | return unsignedp ? sat_fract_type_node : fract_type_node; | |
2882 | if (mode == TYPE_MODE (long_fract_type_node)) | |
2883 | return unsignedp ? sat_long_fract_type_node : long_fract_type_node; | |
2884 | if (mode == TYPE_MODE (long_long_fract_type_node)) | |
2885 | return unsignedp ? sat_long_long_fract_type_node | |
2886 | : long_long_fract_type_node; | |
2887 | ||
2888 | if (mode == TYPE_MODE (unsigned_short_fract_type_node)) | |
2889 | return unsignedp ? sat_unsigned_short_fract_type_node | |
2890 | : unsigned_short_fract_type_node; | |
2891 | if (mode == TYPE_MODE (unsigned_fract_type_node)) | |
2892 | return unsignedp ? sat_unsigned_fract_type_node | |
2893 | : unsigned_fract_type_node; | |
2894 | if (mode == TYPE_MODE (unsigned_long_fract_type_node)) | |
2895 | return unsignedp ? sat_unsigned_long_fract_type_node | |
2896 | : unsigned_long_fract_type_node; | |
2897 | if (mode == TYPE_MODE (unsigned_long_long_fract_type_node)) | |
2898 | return unsignedp ? sat_unsigned_long_long_fract_type_node | |
2899 | : unsigned_long_long_fract_type_node; | |
2900 | ||
2901 | if (mode == TYPE_MODE (short_accum_type_node)) | |
2902 | return unsignedp ? sat_short_accum_type_node : short_accum_type_node; | |
2903 | if (mode == TYPE_MODE (accum_type_node)) | |
2904 | return unsignedp ? sat_accum_type_node : accum_type_node; | |
2905 | if (mode == TYPE_MODE (long_accum_type_node)) | |
2906 | return unsignedp ? sat_long_accum_type_node : long_accum_type_node; | |
2907 | if (mode == TYPE_MODE (long_long_accum_type_node)) | |
2908 | return unsignedp ? sat_long_long_accum_type_node | |
2909 | : long_long_accum_type_node; | |
2910 | ||
2911 | if (mode == TYPE_MODE (unsigned_short_accum_type_node)) | |
2912 | return unsignedp ? sat_unsigned_short_accum_type_node | |
2913 | : unsigned_short_accum_type_node; | |
2914 | if (mode == TYPE_MODE (unsigned_accum_type_node)) | |
2915 | return unsignedp ? sat_unsigned_accum_type_node | |
2916 | : unsigned_accum_type_node; | |
2917 | if (mode == TYPE_MODE (unsigned_long_accum_type_node)) | |
2918 | return unsignedp ? sat_unsigned_long_accum_type_node | |
2919 | : unsigned_long_accum_type_node; | |
2920 | if (mode == TYPE_MODE (unsigned_long_long_accum_type_node)) | |
2921 | return unsignedp ? sat_unsigned_long_long_accum_type_node | |
2922 | : unsigned_long_long_accum_type_node; | |
2923 | ||
2924 | if (mode == QQmode) | |
2925 | return unsignedp ? sat_qq_type_node : qq_type_node; | |
2926 | if (mode == HQmode) | |
2927 | return unsignedp ? sat_hq_type_node : hq_type_node; | |
2928 | if (mode == SQmode) | |
2929 | return unsignedp ? sat_sq_type_node : sq_type_node; | |
2930 | if (mode == DQmode) | |
2931 | return unsignedp ? sat_dq_type_node : dq_type_node; | |
2932 | if (mode == TQmode) | |
2933 | return unsignedp ? sat_tq_type_node : tq_type_node; | |
2934 | ||
2935 | if (mode == UQQmode) | |
2936 | return unsignedp ? sat_uqq_type_node : uqq_type_node; | |
2937 | if (mode == UHQmode) | |
2938 | return unsignedp ? sat_uhq_type_node : uhq_type_node; | |
2939 | if (mode == USQmode) | |
2940 | return unsignedp ? sat_usq_type_node : usq_type_node; | |
2941 | if (mode == UDQmode) | |
2942 | return unsignedp ? sat_udq_type_node : udq_type_node; | |
2943 | if (mode == UTQmode) | |
2944 | return unsignedp ? sat_utq_type_node : utq_type_node; | |
2945 | ||
2946 | if (mode == HAmode) | |
2947 | return unsignedp ? sat_ha_type_node : ha_type_node; | |
2948 | if (mode == SAmode) | |
2949 | return unsignedp ? sat_sa_type_node : sa_type_node; | |
2950 | if (mode == DAmode) | |
2951 | return unsignedp ? sat_da_type_node : da_type_node; | |
2952 | if (mode == TAmode) | |
2953 | return unsignedp ? sat_ta_type_node : ta_type_node; | |
2954 | ||
2955 | if (mode == UHAmode) | |
2956 | return unsignedp ? sat_uha_type_node : uha_type_node; | |
2957 | if (mode == USAmode) | |
2958 | return unsignedp ? sat_usa_type_node : usa_type_node; | |
2959 | if (mode == UDAmode) | |
2960 | return unsignedp ? sat_uda_type_node : uda_type_node; | |
2961 | if (mode == UTAmode) | |
2962 | return unsignedp ? sat_uta_type_node : uta_type_node; | |
2963 | } | |
2964 | ||
5b247e9f | 2965 | for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
2966 | if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
2967 | return TREE_VALUE (t); | |
2968 | ||
b0fc3e72 | 2969 | return 0; |
2970 | } | |
20d39783 | 2971 | |
11773141 | 2972 | tree |
2973 | c_common_unsigned_type (tree type) | |
2974 | { | |
2975 | return c_common_signed_or_unsigned_type (1, type); | |
2976 | } | |
2977 | ||
20d39783 | 2978 | /* Return a signed type the same as TYPE in other respects. */ |
2979 | ||
2980 | tree | |
1cae46be | 2981 | c_common_signed_type (tree type) |
20d39783 | 2982 | { |
4070745f | 2983 | return c_common_signed_or_unsigned_type (0, type); |
20d39783 | 2984 | } |
2985 | ||
2986 | /* Return a type the same as TYPE except unsigned or | |
2987 | signed according to UNSIGNEDP. */ | |
2988 | ||
2989 | tree | |
1cae46be | 2990 | c_common_signed_or_unsigned_type (int unsignedp, tree type) |
20d39783 | 2991 | { |
7a91101f | 2992 | tree type1; |
20d39783 | 2993 | |
7a91101f | 2994 | /* This block of code emulates the behavior of the old |
2995 | c_common_unsigned_type. In particular, it returns | |
2996 | long_unsigned_type_node if passed a long, even when a int would | |
2997 | have the same size. This is necessary for warnings to work | |
2998 | correctly in archs where sizeof(int) == sizeof(long) */ | |
2999 | ||
3000 | type1 = TYPE_MAIN_VARIANT (type); | |
3001 | if (type1 == signed_char_type_node || type1 == char_type_node || type1 == unsigned_char_type_node) | |
3002 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3003 | if (type1 == integer_type_node || type1 == unsigned_type_node) | |
3004 | return unsignedp ? unsigned_type_node : integer_type_node; | |
3005 | if (type1 == short_integer_type_node || type1 == short_unsigned_type_node) | |
3006 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
3007 | if (type1 == long_integer_type_node || type1 == long_unsigned_type_node) | |
3008 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
3009 | if (type1 == long_long_integer_type_node || type1 == long_long_unsigned_type_node) | |
3010 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
3011 | if (type1 == widest_integer_literal_type_node || type1 == widest_unsigned_literal_type_node) | |
3012 | return unsignedp ? widest_unsigned_literal_type_node : widest_integer_literal_type_node; | |
3013 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
3014 | if (type1 == intTI_type_node || type1 == unsigned_intTI_type_node) | |
3015 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
3016 | #endif | |
3017 | if (type1 == intDI_type_node || type1 == unsigned_intDI_type_node) | |
3018 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
3019 | if (type1 == intSI_type_node || type1 == unsigned_intSI_type_node) | |
3020 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
3021 | if (type1 == intHI_type_node || type1 == unsigned_intHI_type_node) | |
3022 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
3023 | if (type1 == intQI_type_node || type1 == unsigned_intQI_type_node) | |
3024 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
3025 | ||
9f92e1a2 | 3026 | #define C_COMMON_FIXED_TYPES(NAME) \ |
3027 | if (type1 == short_ ## NAME ## _type_node \ | |
3028 | || type1 == unsigned_short_ ## NAME ## _type_node) \ | |
3029 | return unsignedp ? unsigned_short_ ## NAME ## _type_node \ | |
3030 | : short_ ## NAME ## _type_node; \ | |
3031 | if (type1 == NAME ## _type_node \ | |
3032 | || type1 == unsigned_ ## NAME ## _type_node) \ | |
3033 | return unsignedp ? unsigned_ ## NAME ## _type_node \ | |
3034 | : NAME ## _type_node; \ | |
3035 | if (type1 == long_ ## NAME ## _type_node \ | |
3036 | || type1 == unsigned_long_ ## NAME ## _type_node) \ | |
3037 | return unsignedp ? unsigned_long_ ## NAME ## _type_node \ | |
3038 | : long_ ## NAME ## _type_node; \ | |
3039 | if (type1 == long_long_ ## NAME ## _type_node \ | |
3040 | || type1 == unsigned_long_long_ ## NAME ## _type_node) \ | |
3041 | return unsignedp ? unsigned_long_long_ ## NAME ## _type_node \ | |
3042 | : long_long_ ## NAME ## _type_node; | |
3043 | ||
3044 | #define C_COMMON_FIXED_MODE_TYPES(NAME) \ | |
3045 | if (type1 == NAME ## _type_node \ | |
3046 | || type1 == u ## NAME ## _type_node) \ | |
3047 | return unsignedp ? u ## NAME ## _type_node \ | |
3048 | : NAME ## _type_node; | |
3049 | ||
3050 | #define C_COMMON_FIXED_TYPES_SAT(NAME) \ | |
3051 | if (type1 == sat_ ## short_ ## NAME ## _type_node \ | |
3052 | || type1 == sat_ ## unsigned_short_ ## NAME ## _type_node) \ | |
3053 | return unsignedp ? sat_ ## unsigned_short_ ## NAME ## _type_node \ | |
3054 | : sat_ ## short_ ## NAME ## _type_node; \ | |
3055 | if (type1 == sat_ ## NAME ## _type_node \ | |
3056 | || type1 == sat_ ## unsigned_ ## NAME ## _type_node) \ | |
3057 | return unsignedp ? sat_ ## unsigned_ ## NAME ## _type_node \ | |
3058 | : sat_ ## NAME ## _type_node; \ | |
3059 | if (type1 == sat_ ## long_ ## NAME ## _type_node \ | |
3060 | || type1 == sat_ ## unsigned_long_ ## NAME ## _type_node) \ | |
3061 | return unsignedp ? sat_ ## unsigned_long_ ## NAME ## _type_node \ | |
3062 | : sat_ ## long_ ## NAME ## _type_node; \ | |
3063 | if (type1 == sat_ ## long_long_ ## NAME ## _type_node \ | |
3064 | || type1 == sat_ ## unsigned_long_long_ ## NAME ## _type_node) \ | |
3065 | return unsignedp ? sat_ ## unsigned_long_long_ ## NAME ## _type_node \ | |
3066 | : sat_ ## long_long_ ## NAME ## _type_node; | |
3067 | ||
3068 | #define C_COMMON_FIXED_MODE_TYPES_SAT(NAME) \ | |
3069 | if (type1 == sat_ ## NAME ## _type_node \ | |
3070 | || type1 == sat_ ## u ## NAME ## _type_node) \ | |
3071 | return unsignedp ? sat_ ## u ## NAME ## _type_node \ | |
3072 | : sat_ ## NAME ## _type_node; | |
3073 | ||
3074 | C_COMMON_FIXED_TYPES (fract); | |
3075 | C_COMMON_FIXED_TYPES_SAT (fract); | |
3076 | C_COMMON_FIXED_TYPES (accum); | |
3077 | C_COMMON_FIXED_TYPES_SAT (accum); | |
3078 | ||
3079 | C_COMMON_FIXED_MODE_TYPES (qq); | |
3080 | C_COMMON_FIXED_MODE_TYPES (hq); | |
3081 | C_COMMON_FIXED_MODE_TYPES (sq); | |
3082 | C_COMMON_FIXED_MODE_TYPES (dq); | |
3083 | C_COMMON_FIXED_MODE_TYPES (tq); | |
3084 | C_COMMON_FIXED_MODE_TYPES_SAT (qq); | |
3085 | C_COMMON_FIXED_MODE_TYPES_SAT (hq); | |
3086 | C_COMMON_FIXED_MODE_TYPES_SAT (sq); | |
3087 | C_COMMON_FIXED_MODE_TYPES_SAT (dq); | |
3088 | C_COMMON_FIXED_MODE_TYPES_SAT (tq); | |
3089 | C_COMMON_FIXED_MODE_TYPES (ha); | |
3090 | C_COMMON_FIXED_MODE_TYPES (sa); | |
3091 | C_COMMON_FIXED_MODE_TYPES (da); | |
3092 | C_COMMON_FIXED_MODE_TYPES (ta); | |
3093 | C_COMMON_FIXED_MODE_TYPES_SAT (ha); | |
3094 | C_COMMON_FIXED_MODE_TYPES_SAT (sa); | |
3095 | C_COMMON_FIXED_MODE_TYPES_SAT (da); | |
3096 | C_COMMON_FIXED_MODE_TYPES_SAT (ta); | |
9421ebb9 | 3097 | |
4f7f7efd | 3098 | /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not |
3099 | the precision; they have precision set to match their range, but | |
3100 | may use a wider mode to match an ABI. If we change modes, we may | |
3101 | wind up with bad conversions. For INTEGER_TYPEs in C, must check | |
3102 | the precision as well, so as to yield correct results for | |
3103 | bit-field types. C++ does not have these separate bit-field | |
3104 | types, and producing a signed or unsigned variant of an | |
3105 | ENUMERAL_TYPE may cause other problems as well. */ | |
3106 | ||
ac265864 | 3107 | if (!INTEGRAL_TYPE_P (type) |
3108 | || TYPE_UNSIGNED (type) == unsignedp) | |
3109 | return type; | |
3110 | ||
4f7f7efd | 3111 | #define TYPE_OK(node) \ |
3112 | (TYPE_MODE (type) == TYPE_MODE (node) \ | |
0c4abe5b | 3113 | && TYPE_PRECISION (type) == TYPE_PRECISION (node)) |
4f7f7efd | 3114 | if (TYPE_OK (signed_char_type_node)) |
20d39783 | 3115 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
4f7f7efd | 3116 | if (TYPE_OK (integer_type_node)) |
20d39783 | 3117 | return unsignedp ? unsigned_type_node : integer_type_node; |
4f7f7efd | 3118 | if (TYPE_OK (short_integer_type_node)) |
20d39783 | 3119 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
4f7f7efd | 3120 | if (TYPE_OK (long_integer_type_node)) |
20d39783 | 3121 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
4f7f7efd | 3122 | if (TYPE_OK (long_long_integer_type_node)) |
20d39783 | 3123 | return (unsignedp ? long_long_unsigned_type_node |
3124 | : long_long_integer_type_node); | |
4f7f7efd | 3125 | if (TYPE_OK (widest_integer_literal_type_node)) |
20d39783 | 3126 | return (unsignedp ? widest_unsigned_literal_type_node |
3127 | : widest_integer_literal_type_node); | |
ef11801e | 3128 | |
3129 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
4f7f7efd | 3130 | if (TYPE_OK (intTI_type_node)) |
ef11801e | 3131 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; |
3132 | #endif | |
4f7f7efd | 3133 | if (TYPE_OK (intDI_type_node)) |
ef11801e | 3134 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
4f7f7efd | 3135 | if (TYPE_OK (intSI_type_node)) |
ef11801e | 3136 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
4f7f7efd | 3137 | if (TYPE_OK (intHI_type_node)) |
ef11801e | 3138 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
4f7f7efd | 3139 | if (TYPE_OK (intQI_type_node)) |
ef11801e | 3140 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
4f7f7efd | 3141 | #undef TYPE_OK |
ef11801e | 3142 | |
0c4abe5b | 3143 | return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); |
20d39783 | 3144 | } |
b268e47e | 3145 | |
c0e47fd4 | 3146 | /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */ |
3147 | ||
3148 | tree | |
3149 | c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp) | |
3150 | { | |
3151 | /* Extended integer types of the same width as a standard type have | |
3152 | lesser rank, so those of the same width as int promote to int or | |
3153 | unsigned int and are valid for printf formats expecting int or | |
3154 | unsigned int. To avoid such special cases, avoid creating | |
3155 | extended integer types for bit-fields if a standard integer type | |
3156 | is available. */ | |
3157 | if (width == TYPE_PRECISION (integer_type_node)) | |
3158 | return unsignedp ? unsigned_type_node : integer_type_node; | |
3159 | if (width == TYPE_PRECISION (signed_char_type_node)) | |
3160 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3161 | if (width == TYPE_PRECISION (short_integer_type_node)) | |
3162 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
3163 | if (width == TYPE_PRECISION (long_integer_type_node)) | |
3164 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
3165 | if (width == TYPE_PRECISION (long_long_integer_type_node)) | |
3166 | return (unsignedp ? long_long_unsigned_type_node | |
3167 | : long_long_integer_type_node); | |
3168 | return build_nonstandard_integer_type (width, unsignedp); | |
3169 | } | |
3170 | ||
b268e47e | 3171 | /* The C version of the register_builtin_type langhook. */ |
3172 | ||
3173 | void | |
3174 | c_register_builtin_type (tree type, const char* name) | |
3175 | { | |
3176 | tree decl; | |
3177 | ||
3178 | decl = build_decl (TYPE_DECL, get_identifier (name), type); | |
3179 | DECL_ARTIFICIAL (decl) = 1; | |
3180 | if (!TYPE_NAME (type)) | |
3181 | TYPE_NAME (type) = decl; | |
3182 | pushdecl (decl); | |
5b247e9f | 3183 | |
3184 | registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
b268e47e | 3185 | } |
a9b9d10c | 3186 | \f |
aff9e656 | 3187 | /* Print an error message for invalid operands to arith operation |
8e70fb09 | 3188 | CODE with TYPE0 for operand 0, and TYPE1 for operand 1. |
3189 | LOCATION is the location of the message. */ | |
b0fc3e72 | 3190 | |
3191 | void | |
8e70fb09 | 3192 | binary_op_error (location_t location, enum tree_code code, |
3193 | tree type0, tree type1) | |
b0fc3e72 | 3194 | { |
19cb6b50 | 3195 | const char *opname; |
f03946e4 | 3196 | |
b0fc3e72 | 3197 | switch (code) |
3198 | { | |
b0fc3e72 | 3199 | case PLUS_EXPR: |
3200 | opname = "+"; break; | |
3201 | case MINUS_EXPR: | |
3202 | opname = "-"; break; | |
3203 | case MULT_EXPR: | |
3204 | opname = "*"; break; | |
3205 | case MAX_EXPR: | |
3206 | opname = "max"; break; | |
3207 | case MIN_EXPR: | |
3208 | opname = "min"; break; | |
3209 | case EQ_EXPR: | |
3210 | opname = "=="; break; | |
3211 | case NE_EXPR: | |
3212 | opname = "!="; break; | |
3213 | case LE_EXPR: | |
3214 | opname = "<="; break; | |
3215 | case GE_EXPR: | |
3216 | opname = ">="; break; | |
3217 | case LT_EXPR: | |
3218 | opname = "<"; break; | |
3219 | case GT_EXPR: | |
3220 | opname = ">"; break; | |
3221 | case LSHIFT_EXPR: | |
3222 | opname = "<<"; break; | |
3223 | case RSHIFT_EXPR: | |
3224 | opname = ">>"; break; | |
3225 | case TRUNC_MOD_EXPR: | |
66618a1e | 3226 | case FLOOR_MOD_EXPR: |
b0fc3e72 | 3227 | opname = "%"; break; |
3228 | case TRUNC_DIV_EXPR: | |
66618a1e | 3229 | case FLOOR_DIV_EXPR: |
b0fc3e72 | 3230 | opname = "/"; break; |
3231 | case BIT_AND_EXPR: | |
3232 | opname = "&"; break; | |
3233 | case BIT_IOR_EXPR: | |
3234 | opname = "|"; break; | |
3235 | case TRUTH_ANDIF_EXPR: | |
3236 | opname = "&&"; break; | |
3237 | case TRUTH_ORIF_EXPR: | |
3238 | opname = "||"; break; | |
3239 | case BIT_XOR_EXPR: | |
3240 | opname = "^"; break; | |
31f820d2 | 3241 | default: |
315ba355 | 3242 | gcc_unreachable (); |
b0fc3e72 | 3243 | } |
8e70fb09 | 3244 | error_at (location, |
3245 | "invalid operands to binary %s (have %qT and %qT)", opname, | |
3246 | type0, type1); | |
b0fc3e72 | 3247 | } |
3248 | \f | |
3249 | /* Subroutine of build_binary_op, used for comparison operations. | |
3250 | See if the operands have both been converted from subword integer types | |
3251 | and, if so, perhaps change them both back to their original type. | |
5b511807 | 3252 | This function is also responsible for converting the two operands |
3253 | to the proper common type for comparison. | |
b0fc3e72 | 3254 | |
3255 | The arguments of this function are all pointers to local variables | |
3256 | of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
3257 | RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
3258 | ||
3259 | If this function returns nonzero, it means that the comparison has | |
3260 | a constant value. What this function returns is an expression for | |
3261 | that value. */ | |
3262 | ||
3263 | tree | |
1cae46be | 3264 | shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, |
3265 | enum tree_code *rescode_ptr) | |
b0fc3e72 | 3266 | { |
19cb6b50 | 3267 | tree type; |
b0fc3e72 | 3268 | tree op0 = *op0_ptr; |
3269 | tree op1 = *op1_ptr; | |
3270 | int unsignedp0, unsignedp1; | |
3271 | int real1, real2; | |
3272 | tree primop0, primop1; | |
3273 | enum tree_code code = *rescode_ptr; | |
3274 | ||
3275 | /* Throw away any conversions to wider types | |
3276 | already present in the operands. */ | |
3277 | ||
3278 | primop0 = get_narrower (op0, &unsignedp0); | |
3279 | primop1 = get_narrower (op1, &unsignedp1); | |
3280 | ||
3281 | /* Handle the case that OP0 does not *contain* a conversion | |
3282 | but it *requires* conversion to FINAL_TYPE. */ | |
3283 | ||
3284 | if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
78a8ed03 | 3285 | unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
b0fc3e72 | 3286 | if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) |
78a8ed03 | 3287 | unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
b0fc3e72 | 3288 | |
3289 | /* If one of the operands must be floated, we cannot optimize. */ | |
3290 | real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
3291 | real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
3292 | ||
3293 | /* If first arg is constant, swap the args (changing operation | |
2bd278cc | 3294 | so value is preserved), for canonicalization. Don't do this if |
3295 | the second arg is 0. */ | |
b0fc3e72 | 3296 | |
2bd278cc | 3297 | if (TREE_CONSTANT (primop0) |
9421ebb9 | 3298 | && !integer_zerop (primop1) && !real_zerop (primop1) |
3299 | && !fixed_zerop (primop1)) | |
b0fc3e72 | 3300 | { |
19cb6b50 | 3301 | tree tem = primop0; |
3302 | int temi = unsignedp0; | |
b0fc3e72 | 3303 | primop0 = primop1; |
3304 | primop1 = tem; | |
3305 | tem = op0; | |
3306 | op0 = op1; | |
3307 | op1 = tem; | |
3308 | *op0_ptr = op0; | |
3309 | *op1_ptr = op1; | |
3310 | unsignedp0 = unsignedp1; | |
3311 | unsignedp1 = temi; | |
3312 | temi = real1; | |
3313 | real1 = real2; | |
3314 | real2 = temi; | |
3315 | ||
3316 | switch (code) | |
3317 | { | |
3318 | case LT_EXPR: | |
3319 | code = GT_EXPR; | |
3320 | break; | |
3321 | case GT_EXPR: | |
3322 | code = LT_EXPR; | |
3323 | break; | |
3324 | case LE_EXPR: | |
3325 | code = GE_EXPR; | |
3326 | break; | |
3327 | case GE_EXPR: | |
3328 | code = LE_EXPR; | |
3329 | break; | |
31f820d2 | 3330 | default: |
3331 | break; | |
b0fc3e72 | 3332 | } |
3333 | *rescode_ptr = code; | |
3334 | } | |
3335 | ||
3336 | /* If comparing an integer against a constant more bits wide, | |
3337 | maybe we can deduce a value of 1 or 0 independent of the data. | |
3338 | Or else truncate the constant now | |
3339 | rather than extend the variable at run time. | |
3340 | ||
3341 | This is only interesting if the constant is the wider arg. | |
3342 | Also, it is not safe if the constant is unsigned and the | |
3343 | variable arg is signed, since in this case the variable | |
3344 | would be sign-extended and then regarded as unsigned. | |
3345 | Our technique fails in this case because the lowest/highest | |
3346 | possible unsigned results don't follow naturally from the | |
3347 | lowest/highest possible values of the variable operand. | |
3348 | For just EQ_EXPR and NE_EXPR there is another technique that | |
3349 | could be used: see if the constant can be faithfully represented | |
3350 | in the other operand's type, by truncating it and reextending it | |
3351 | and see if that preserves the constant's value. */ | |
3352 | ||
3353 | if (!real1 && !real2 | |
9421ebb9 | 3354 | && TREE_CODE (TREE_TYPE (primop0)) != FIXED_POINT_TYPE |
b0fc3e72 | 3355 | && TREE_CODE (primop1) == INTEGER_CST |
3356 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
3357 | { | |
3358 | int min_gt, max_gt, min_lt, max_lt; | |
3359 | tree maxval, minval; | |
3360 | /* 1 if comparison is nominally unsigned. */ | |
78a8ed03 | 3361 | int unsignedp = TYPE_UNSIGNED (*restype_ptr); |
b0fc3e72 | 3362 | tree val; |
3363 | ||
4070745f | 3364 | type = c_common_signed_or_unsigned_type (unsignedp0, |
3365 | TREE_TYPE (primop0)); | |
cda09c61 | 3366 | |
b0fc3e72 | 3367 | maxval = TYPE_MAX_VALUE (type); |
3368 | minval = TYPE_MIN_VALUE (type); | |
3369 | ||
3370 | if (unsignedp && !unsignedp0) | |
4070745f | 3371 | *restype_ptr = c_common_signed_type (*restype_ptr); |
b0fc3e72 | 3372 | |
3373 | if (TREE_TYPE (primop1) != *restype_ptr) | |
18dbec6f | 3374 | { |
9a5e8086 | 3375 | /* Convert primop1 to target type, but do not introduce |
3376 | additional overflow. We know primop1 is an int_cst. */ | |
c8110c8f | 3377 | primop1 = force_fit_type_double (*restype_ptr, |
3378 | TREE_INT_CST_LOW (primop1), | |
3379 | TREE_INT_CST_HIGH (primop1), 0, | |
eddad94a | 3380 | TREE_OVERFLOW (primop1)); |
18dbec6f | 3381 | } |
b0fc3e72 | 3382 | if (type != *restype_ptr) |
3383 | { | |
3384 | minval = convert (*restype_ptr, minval); | |
3385 | maxval = convert (*restype_ptr, maxval); | |
3386 | } | |
3387 | ||
3388 | if (unsignedp && unsignedp0) | |
3389 | { | |
3390 | min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
3391 | max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
3392 | min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
3393 | max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
3394 | } | |
3395 | else | |
3396 | { | |
3397 | min_gt = INT_CST_LT (primop1, minval); | |
3398 | max_gt = INT_CST_LT (primop1, maxval); | |
3399 | min_lt = INT_CST_LT (minval, primop1); | |
3400 | max_lt = INT_CST_LT (maxval, primop1); | |
3401 | } | |
3402 | ||
3403 | val = 0; | |
3404 | /* This used to be a switch, but Genix compiler can't handle that. */ | |
3405 | if (code == NE_EXPR) | |
3406 | { | |
3407 | if (max_lt || min_gt) | |
3c2239cf | 3408 | val = truthvalue_true_node; |
b0fc3e72 | 3409 | } |
3410 | else if (code == EQ_EXPR) | |
3411 | { | |
3412 | if (max_lt || min_gt) | |
3c2239cf | 3413 | val = truthvalue_false_node; |
b0fc3e72 | 3414 | } |
3415 | else if (code == LT_EXPR) | |
3416 | { | |
3417 | if (max_lt) | |
3c2239cf | 3418 | val = truthvalue_true_node; |
b0fc3e72 | 3419 | if (!min_lt) |
3c2239cf | 3420 | val = truthvalue_false_node; |
b0fc3e72 | 3421 | } |
3422 | else if (code == GT_EXPR) | |
3423 | { | |
3424 | if (min_gt) | |
3c2239cf | 3425 | val = truthvalue_true_node; |
b0fc3e72 | 3426 | if (!max_gt) |
3c2239cf | 3427 | val = truthvalue_false_node; |
b0fc3e72 | 3428 | } |
3429 | else if (code == LE_EXPR) | |
3430 | { | |
3431 | if (!max_gt) | |
3c2239cf | 3432 | val = truthvalue_true_node; |
b0fc3e72 | 3433 | if (min_gt) |
3c2239cf | 3434 | val = truthvalue_false_node; |
b0fc3e72 | 3435 | } |
3436 | else if (code == GE_EXPR) | |
3437 | { | |
3438 | if (!min_lt) | |
3c2239cf | 3439 | val = truthvalue_true_node; |
b0fc3e72 | 3440 | if (max_lt) |
3c2239cf | 3441 | val = truthvalue_false_node; |
b0fc3e72 | 3442 | } |
3443 | ||
3444 | /* If primop0 was sign-extended and unsigned comparison specd, | |
3445 | we did a signed comparison above using the signed type bounds. | |
3446 | But the comparison we output must be unsigned. | |
3447 | ||
3448 | Also, for inequalities, VAL is no good; but if the signed | |
3449 | comparison had *any* fixed result, it follows that the | |
3450 | unsigned comparison just tests the sign in reverse | |
3451 | (positive values are LE, negative ones GE). | |
3452 | So we can generate an unsigned comparison | |
3453 | against an extreme value of the signed type. */ | |
3454 | ||
3455 | if (unsignedp && !unsignedp0) | |
3456 | { | |
3457 | if (val != 0) | |
3458 | switch (code) | |
3459 | { | |
3460 | case LT_EXPR: | |
3461 | case GE_EXPR: | |
3462 | primop1 = TYPE_MIN_VALUE (type); | |
3463 | val = 0; | |
3464 | break; | |
3465 | ||
3466 | case LE_EXPR: | |
3467 | case GT_EXPR: | |
3468 | primop1 = TYPE_MAX_VALUE (type); | |
3469 | val = 0; | |
3470 | break; | |
31f820d2 | 3471 | |
3472 | default: | |
3473 | break; | |
b0fc3e72 | 3474 | } |
11773141 | 3475 | type = c_common_unsigned_type (type); |
b0fc3e72 | 3476 | } |
3477 | ||
fe5f2366 | 3478 | if (TREE_CODE (primop0) != INTEGER_CST) |
b0fc3e72 | 3479 | { |
3c2239cf | 3480 | if (val == truthvalue_false_node) |
e6e352cb | 3481 | warning (OPT_Wtype_limits, "comparison is always false due to limited range of data type"); |
3c2239cf | 3482 | if (val == truthvalue_true_node) |
e6e352cb | 3483 | warning (OPT_Wtype_limits, "comparison is always true due to limited range of data type"); |
b0fc3e72 | 3484 | } |
3485 | ||
3486 | if (val != 0) | |
3487 | { | |
3488 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
3489 | if (TREE_SIDE_EFFECTS (primop0)) | |
14ae0310 | 3490 | return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); |
b0fc3e72 | 3491 | return val; |
3492 | } | |
3493 | ||
3494 | /* Value is not predetermined, but do the comparison | |
3495 | in the type of the operand that is not constant. | |
3496 | TYPE is already properly set. */ | |
3497 | } | |
c4503c0a | 3498 | |
3499 | /* If either arg is decimal float and the other is float, find the | |
3500 | proper common type to use for comparison. */ | |
3501 | else if (real1 && real2 | |
3502 | && (DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop0))) | |
3503 | || DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop1))))) | |
3504 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
3505 | ||
b0fc3e72 | 3506 | else if (real1 && real2 |
2203bd5c | 3507 | && (TYPE_PRECISION (TREE_TYPE (primop0)) |
3508 | == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
b0fc3e72 | 3509 | type = TREE_TYPE (primop0); |
3510 | ||
3511 | /* If args' natural types are both narrower than nominal type | |
3512 | and both extend in the same manner, compare them | |
3513 | in the type of the wider arg. | |
3514 | Otherwise must actually extend both to the nominal | |
3515 | common type lest different ways of extending | |
3516 | alter the result. | |
3517 | (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
3518 | ||
3519 | else if (unsignedp0 == unsignedp1 && real1 == real2 | |
3520 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
3521 | && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
3522 | { | |
3523 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
4070745f | 3524 | type = c_common_signed_or_unsigned_type (unsignedp0 |
78a8ed03 | 3525 | || TYPE_UNSIGNED (*restype_ptr), |
4070745f | 3526 | type); |
b0fc3e72 | 3527 | /* Make sure shorter operand is extended the right way |
3528 | to match the longer operand. */ | |
4070745f | 3529 | primop0 |
3530 | = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
3531 | TREE_TYPE (primop0)), | |
3532 | primop0); | |
3533 | primop1 | |
3534 | = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
3535 | TREE_TYPE (primop1)), | |
3536 | primop1); | |
b0fc3e72 | 3537 | } |
3538 | else | |
3539 | { | |
3540 | /* Here we must do the comparison on the nominal type | |
3541 | using the args exactly as we received them. */ | |
3542 | type = *restype_ptr; | |
3543 | primop0 = op0; | |
3544 | primop1 = op1; | |
3545 | ||
3546 | if (!real1 && !real2 && integer_zerop (primop1) | |
78a8ed03 | 3547 | && TYPE_UNSIGNED (*restype_ptr)) |
b0fc3e72 | 3548 | { |
3549 | tree value = 0; | |
3550 | switch (code) | |
3551 | { | |
3552 | case GE_EXPR: | |
e6e352cb | 3553 | /* All unsigned values are >= 0, so we warn. However, |
3554 | if OP0 is a constant that is >= 0, the signedness of | |
3555 | the comparison isn't an issue, so suppress the | |
3556 | warning. */ | |
3557 | if (warn_type_limits && !in_system_header | |
84166705 | 3558 | && !(TREE_CODE (primop0) == INTEGER_CST |
3559 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
3560 | primop0)))) | |
e6e352cb | 3561 | warning (OPT_Wtype_limits, |
3562 | "comparison of unsigned expression >= 0 is always true"); | |
3c2239cf | 3563 | value = truthvalue_true_node; |
b0fc3e72 | 3564 | break; |
3565 | ||
3566 | case LT_EXPR: | |
e6e352cb | 3567 | if (warn_type_limits && !in_system_header |
84166705 | 3568 | && !(TREE_CODE (primop0) == INTEGER_CST |
3569 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
3570 | primop0)))) | |
e6e352cb | 3571 | warning (OPT_Wtype_limits, |
3572 | "comparison of unsigned expression < 0 is always false"); | |
3c2239cf | 3573 | value = truthvalue_false_node; |
31f820d2 | 3574 | break; |
3575 | ||
3576 | default: | |
3577 | break; | |
b0fc3e72 | 3578 | } |
3579 | ||
3580 | if (value != 0) | |
3581 | { | |
3582 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
3583 | if (TREE_SIDE_EFFECTS (primop0)) | |
14ae0310 | 3584 | return build2 (COMPOUND_EXPR, TREE_TYPE (value), |
3585 | primop0, value); | |
b0fc3e72 | 3586 | return value; |
3587 | } | |
3588 | } | |
3589 | } | |
3590 | ||
3591 | *op0_ptr = convert (type, primop0); | |
3592 | *op1_ptr = convert (type, primop1); | |
3593 | ||
3c2239cf | 3594 | *restype_ptr = truthvalue_type_node; |
b0fc3e72 | 3595 | |
3596 | return 0; | |
3597 | } | |
3598 | \f | |
1c26100f | 3599 | /* Return a tree for the sum or difference (RESULTCODE says which) |
3600 | of pointer PTROP and integer INTOP. */ | |
3601 | ||
3602 | tree | |
d924b670 | 3603 | pointer_int_sum (location_t location, enum tree_code resultcode, |
3604 | tree ptrop, tree intop) | |
1c26100f | 3605 | { |
add6ee5e | 3606 | tree size_exp, ret; |
1c26100f | 3607 | |
1c26100f | 3608 | /* The result is a pointer of the same type that is being added. */ |
1c26100f | 3609 | tree result_type = TREE_TYPE (ptrop); |
3610 | ||
3611 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
3612 | { | |
d924b670 | 3613 | pedwarn (location, pedantic ? OPT_pedantic : OPT_Wpointer_arith, |
8864917d | 3614 | "pointer of type %<void *%> used in arithmetic"); |
1c26100f | 3615 | size_exp = integer_one_node; |
3616 | } | |
3617 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
3618 | { | |
d924b670 | 3619 | pedwarn (location, pedantic ? OPT_pedantic : OPT_Wpointer_arith, |
8864917d | 3620 | "pointer to a function used in arithmetic"); |
1c26100f | 3621 | size_exp = integer_one_node; |
3622 | } | |
3623 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
3624 | { | |
d924b670 | 3625 | pedwarn (location, pedantic ? OPT_pedantic : OPT_Wpointer_arith, |
8864917d | 3626 | "pointer to member function used in arithmetic"); |
1c26100f | 3627 | size_exp = integer_one_node; |
3628 | } | |
1c26100f | 3629 | else |
3630 | size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
3631 | ||
add6ee5e | 3632 | /* We are manipulating pointer values, so we don't need to warn |
3633 | about relying on undefined signed overflow. We disable the | |
3634 | warning here because we use integer types so fold won't know that | |
3635 | they are really pointers. */ | |
3636 | fold_defer_overflow_warnings (); | |
3637 | ||
1c26100f | 3638 | /* If what we are about to multiply by the size of the elements |
3639 | contains a constant term, apply distributive law | |
3640 | and multiply that constant term separately. | |
3641 | This helps produce common subexpressions. */ | |
1c26100f | 3642 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) |
84166705 | 3643 | && !TREE_CONSTANT (intop) |
1c26100f | 3644 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) |
3645 | && TREE_CONSTANT (size_exp) | |
3646 | /* If the constant comes from pointer subtraction, | |
3647 | skip this optimization--it would cause an error. */ | |
3648 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
3649 | /* If the constant is unsigned, and smaller than the pointer size, | |
3650 | then we must skip this optimization. This is because it could cause | |
3651 | an overflow error if the constant is negative but INTOP is not. */ | |
84166705 | 3652 | && (!TYPE_UNSIGNED (TREE_TYPE (intop)) |
1c26100f | 3653 | || (TYPE_PRECISION (TREE_TYPE (intop)) |
3654 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
3655 | { | |
3656 | enum tree_code subcode = resultcode; | |
3657 | tree int_type = TREE_TYPE (intop); | |
3658 | if (TREE_CODE (intop) == MINUS_EXPR) | |
3659 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
3660 | /* Convert both subexpression types to the type of intop, | |
3661 | because weird cases involving pointer arithmetic | |
3662 | can result in a sum or difference with different type args. */ | |
8e70fb09 | 3663 | ptrop = build_binary_op (EXPR_LOCATION (TREE_OPERAND (intop, 1)), |
3664 | subcode, ptrop, | |
1c26100f | 3665 | convert (int_type, TREE_OPERAND (intop, 1)), 1); |
3666 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
3667 | } | |
3668 | ||
3669 | /* Convert the integer argument to a type the same size as sizetype | |
3670 | so the multiply won't overflow spuriously. */ | |
1c26100f | 3671 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) |
78a8ed03 | 3672 | || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) |
1cae46be | 3673 | intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), |
78a8ed03 | 3674 | TYPE_UNSIGNED (sizetype)), intop); |
1c26100f | 3675 | |
3676 | /* Replace the integer argument with a suitable product by the object size. | |
3677 | Do this multiplication as signed, then convert to the appropriate | |
499e523f | 3678 | type for the pointer operation. */ |
3679 | intop = convert (sizetype, | |
8e70fb09 | 3680 | build_binary_op (EXPR_LOCATION (intop), |
3681 | MULT_EXPR, intop, | |
499e523f | 3682 | convert (TREE_TYPE (intop), size_exp), 1)); |
0de36bdb | 3683 | |
499e523f | 3684 | /* Create the sum or difference. */ |
0de36bdb | 3685 | if (resultcode == MINUS_EXPR) |
499e523f | 3686 | intop = fold_build1 (NEGATE_EXPR, sizetype, intop); |
1c26100f | 3687 | |
d924b670 | 3688 | if (TREE_CODE (intop) == INTEGER_CST) |
3689 | { | |
3690 | tree offset_node; | |
3691 | tree string_cst = string_constant (ptrop, &offset_node); | |
3692 | ||
3693 | if (string_cst != 0 | |
3694 | && !(offset_node && TREE_CODE (offset_node) != INTEGER_CST)) | |
3695 | { | |
3696 | HOST_WIDE_INT max = TREE_STRING_LENGTH (string_cst); | |
3697 | HOST_WIDE_INT offset; | |
3698 | if (offset_node == 0) | |
3699 | offset = 0; | |
3700 | else if (! host_integerp (offset_node, 0)) | |
3701 | offset = -1; | |
3702 | else | |
3703 | offset = tree_low_cst (offset_node, 0); | |
3704 | ||
3705 | offset = offset + tree_low_cst (intop, 0); | |
3706 | if (offset < 0 || offset > max) | |
545ba0d7 | 3707 | warning_at (location, 0, |
3708 | "offset %<%wd%> outside bounds of constant string", | |
d924b670 | 3709 | tree_low_cst (intop, 0)); |
3710 | } | |
3711 | } | |
3712 | ||
0de36bdb | 3713 | ret = fold_build2 (POINTER_PLUS_EXPR, result_type, ptrop, intop); |
add6ee5e | 3714 | |
3715 | fold_undefer_and_ignore_overflow_warnings (); | |
3716 | ||
3717 | return ret; | |
1c26100f | 3718 | } |
3719 | \f | |
a75b1c71 | 3720 | /* Wrap a SAVE_EXPR around EXPR, if appropriate. Like save_expr, but |
3721 | for C folds the inside expression and wraps a C_MAYBE_CONST_EXPR | |
3722 | around the SAVE_EXPR if needed so that c_fully_fold does not need | |
3723 | to look inside SAVE_EXPRs. */ | |
3724 | ||
3725 | tree | |
3726 | c_save_expr (tree expr) | |
3727 | { | |
3728 | bool maybe_const = true; | |
3729 | if (c_dialect_cxx ()) | |
3730 | return save_expr (expr); | |
3731 | expr = c_fully_fold (expr, false, &maybe_const); | |
3732 | expr = save_expr (expr); | |
3733 | if (!maybe_const) | |
3734 | { | |
3735 | expr = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (expr), NULL, expr); | |
3736 | C_MAYBE_CONST_EXPR_NON_CONST (expr) = 1; | |
3737 | } | |
3738 | return expr; | |
3739 | } | |
3740 | ||
6b68e71a | 3741 | /* Return whether EXPR is a declaration whose address can never be |
3742 | NULL. */ | |
3743 | ||
3744 | bool | |
9f627b1a | 3745 | decl_with_nonnull_addr_p (const_tree expr) |
6b68e71a | 3746 | { |
3747 | return (DECL_P (expr) | |
3748 | && (TREE_CODE (expr) == PARM_DECL | |
3749 | || TREE_CODE (expr) == LABEL_DECL | |
3750 | || !DECL_WEAK (expr))); | |
3751 | } | |
3752 | ||
b0fc3e72 | 3753 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
45a78cc0 | 3754 | or for an `if' or `while' statement or ?..: exp. It should already |
3755 | have been validated to be of suitable type; otherwise, a bad | |
3756 | diagnostic may result. | |
b0fc3e72 | 3757 | |
8e70fb09 | 3758 | The EXPR is located at LOCATION. |
3759 | ||
b0fc3e72 | 3760 | This preparation consists of taking the ordinary |
3761 | representation of an expression expr and producing a valid tree | |
3762 | boolean expression describing whether expr is nonzero. We could | |
3c2239cf | 3763 | simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), |
b0fc3e72 | 3764 | but we optimize comparisons, &&, ||, and !. |
3765 | ||
3c2239cf | 3766 | The resulting type should always be `truthvalue_type_node'. */ |
b0fc3e72 | 3767 | |
3768 | tree | |
8e70fb09 | 3769 | c_common_truthvalue_conversion (location_t location, tree expr) |
b0fc3e72 | 3770 | { |
b0fc3e72 | 3771 | switch (TREE_CODE (expr)) |
3772 | { | |
318a728f | 3773 | case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR: |
e1232ce2 | 3774 | case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: |
3775 | case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR: | |
3776 | case ORDERED_EXPR: case UNORDERED_EXPR: | |
ce04dcdc | 3777 | if (TREE_TYPE (expr) == truthvalue_type_node) |
3778 | return expr; | |
3779 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
3780 | TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1)); | |
3781 | ||
b0fc3e72 | 3782 | case TRUTH_ANDIF_EXPR: |
3783 | case TRUTH_ORIF_EXPR: | |
3784 | case TRUTH_AND_EXPR: | |
3785 | case TRUTH_OR_EXPR: | |
31f6e93c | 3786 | case TRUTH_XOR_EXPR: |
ce04dcdc | 3787 | if (TREE_TYPE (expr) == truthvalue_type_node) |
3788 | return expr; | |
3789 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
8e70fb09 | 3790 | c_common_truthvalue_conversion (location, |
3791 | TREE_OPERAND (expr, 0)), | |
3792 | c_common_truthvalue_conversion (location, | |
3793 | TREE_OPERAND (expr, 1))); | |
3e851b85 | 3794 | |
f6e28f72 | 3795 | case TRUTH_NOT_EXPR: |
ce04dcdc | 3796 | if (TREE_TYPE (expr) == truthvalue_type_node) |
3797 | return expr; | |
3798 | return build1 (TREE_CODE (expr), truthvalue_type_node, | |
8e70fb09 | 3799 | c_common_truthvalue_conversion (location, |
3800 | TREE_OPERAND (expr, 0))); | |
f6e28f72 | 3801 | |
b0fc3e72 | 3802 | case ERROR_MARK: |
3803 | return expr; | |
3804 | ||
3805 | case INTEGER_CST: | |
eddad94a | 3806 | return integer_zerop (expr) ? truthvalue_false_node |
3807 | : truthvalue_true_node; | |
b0fc3e72 | 3808 | |
3809 | case REAL_CST: | |
5000e21c | 3810 | return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0) |
3811 | ? truthvalue_true_node | |
3812 | : truthvalue_false_node; | |
b0fc3e72 | 3813 | |
9421ebb9 | 3814 | case FIXED_CST: |
3815 | return fixed_compare (NE_EXPR, &TREE_FIXED_CST (expr), | |
3816 | &FCONST0 (TYPE_MODE (TREE_TYPE (expr)))) | |
3817 | ? truthvalue_true_node | |
3818 | : truthvalue_false_node; | |
3819 | ||
ce04dcdc | 3820 | case FUNCTION_DECL: |
b6889cb0 | 3821 | expr = build_unary_op (location, ADDR_EXPR, expr, 0); |
ce04dcdc | 3822 | /* Fall through. */ |
3823 | ||
b0fc3e72 | 3824 | case ADDR_EXPR: |
ce871053 | 3825 | { |
ee7d4d6a | 3826 | tree inner = TREE_OPERAND (expr, 0); |
6b68e71a | 3827 | if (decl_with_nonnull_addr_p (inner)) |
ce871053 | 3828 | { |
6b68e71a | 3829 | /* Common Ada/Pascal programmer's mistake. */ |
8e70fb09 | 3830 | warning_at (location, |
3831 | OPT_Waddress, | |
3832 | "the address of %qD will always evaluate as %<true%>", | |
3833 | inner); | |
ce871053 | 3834 | return truthvalue_true_node; |
3835 | } | |
65b5e6a6 | 3836 | |
6b68e71a | 3837 | /* If we still have a decl, it is possible for its address to |
3838 | be NULL, so we cannot optimize. */ | |
3839 | if (DECL_P (inner)) | |
3840 | { | |
3841 | gcc_assert (DECL_WEAK (inner)); | |
3842 | break; | |
3843 | } | |
ce871053 | 3844 | |
ee7d4d6a | 3845 | if (TREE_SIDE_EFFECTS (inner)) |
14ae0310 | 3846 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
ee7d4d6a | 3847 | inner, truthvalue_true_node); |
ce871053 | 3848 | else |
3849 | return truthvalue_true_node; | |
3850 | } | |
b0fc3e72 | 3851 | |
2203bd5c | 3852 | case COMPLEX_EXPR: |
8e70fb09 | 3853 | return build_binary_op (EXPR_LOCATION (expr), |
3854 | (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) | |
95809de4 | 3855 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
8e70fb09 | 3856 | c_common_truthvalue_conversion (location, |
3857 | TREE_OPERAND (expr, 0)), | |
3858 | c_common_truthvalue_conversion (location, | |
3859 | TREE_OPERAND (expr, 1)), | |
2203bd5c | 3860 | 0); |
3861 | ||
b0fc3e72 | 3862 | case NEGATE_EXPR: |
3863 | case ABS_EXPR: | |
3864 | case FLOAT_EXPR: | |
d10cfa8d | 3865 | /* These don't change whether an object is nonzero or zero. */ |
8e70fb09 | 3866 | return c_common_truthvalue_conversion (location, TREE_OPERAND (expr, 0)); |
b0fc3e72 | 3867 | |
3868 | case LROTATE_EXPR: | |
3869 | case RROTATE_EXPR: | |
d10cfa8d | 3870 | /* These don't change whether an object is zero or nonzero, but |
b0fc3e72 | 3871 | we can't ignore them if their second arg has side-effects. */ |
3872 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
14ae0310 | 3873 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
3874 | TREE_OPERAND (expr, 1), | |
8e70fb09 | 3875 | c_common_truthvalue_conversion |
3876 | (location, TREE_OPERAND (expr, 0))); | |
b0fc3e72 | 3877 | else |
8e70fb09 | 3878 | return c_common_truthvalue_conversion (location, |
3879 | TREE_OPERAND (expr, 0)); | |
73be5127 | 3880 | |
b0fc3e72 | 3881 | case COND_EXPR: |
3882 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
a75b1c71 | 3883 | if (c_dialect_cxx ()) |
3884 | return fold_build3 (COND_EXPR, truthvalue_type_node, | |
3885 | TREE_OPERAND (expr, 0), | |
3886 | c_common_truthvalue_conversion (location, | |
3887 | TREE_OPERAND (expr, | |
3888 | 1)), | |
3889 | c_common_truthvalue_conversion (location, | |
3890 | TREE_OPERAND (expr, | |
3891 | 2))); | |
3892 | else | |
3893 | /* Folding will happen later for C. */ | |
3894 | return build3 (COND_EXPR, truthvalue_type_node, | |
3895 | TREE_OPERAND (expr, 0), | |
3896 | c_common_truthvalue_conversion (location, | |
3897 | TREE_OPERAND (expr, 1)), | |
3898 | c_common_truthvalue_conversion (location, | |
3899 | TREE_OPERAND (expr, 2))); | |
b0fc3e72 | 3900 | |
72dd6141 | 3901 | CASE_CONVERT: |
b0fc3e72 | 3902 | /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, |
3903 | since that affects how `default_conversion' will behave. */ | |
3904 | if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
3905 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
3906 | break; | |
b0fc3e72 | 3907 | /* If this is widening the argument, we can ignore it. */ |
3908 | if (TYPE_PRECISION (TREE_TYPE (expr)) | |
3909 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
8e70fb09 | 3910 | return c_common_truthvalue_conversion (location, |
3911 | TREE_OPERAND (expr, 0)); | |
b0fc3e72 | 3912 | break; |
3913 | ||
16837b18 | 3914 | case MODIFY_EXPR: |
60a0513e | 3915 | if (!TREE_NO_WARNING (expr) |
3916 | && warn_parentheses) | |
3917 | { | |
3918 | warning (OPT_Wparentheses, | |
3919 | "suggest parentheses around assignment used as truth value"); | |
3920 | TREE_NO_WARNING (expr) = 1; | |
3921 | } | |
16837b18 | 3922 | break; |
73be5127 | 3923 | |
31f820d2 | 3924 | default: |
3925 | break; | |
b0fc3e72 | 3926 | } |
3927 | ||
2ba726d2 | 3928 | if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) |
a0748b7d | 3929 | { |
a75b1c71 | 3930 | tree t = c_save_expr (expr); |
a0748b7d | 3931 | return (build_binary_op |
8e70fb09 | 3932 | (EXPR_LOCATION (expr), |
3933 | (TREE_SIDE_EFFECTS (expr) | |
a0748b7d | 3934 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
b6889cb0 | 3935 | c_common_truthvalue_conversion |
3936 | (location, | |
3937 | build_unary_op (location, REALPART_EXPR, t, 0)), | |
3938 | c_common_truthvalue_conversion | |
3939 | (location, | |
3940 | build_unary_op (location, IMAGPART_EXPR, t, 0)), | |
a0748b7d | 3941 | 0)); |
3942 | } | |
2ba726d2 | 3943 | |
9421ebb9 | 3944 | if (TREE_CODE (TREE_TYPE (expr)) == FIXED_POINT_TYPE) |
3945 | { | |
3946 | tree fixed_zero_node = build_fixed (TREE_TYPE (expr), | |
3947 | FCONST0 (TYPE_MODE | |
3948 | (TREE_TYPE (expr)))); | |
8e70fb09 | 3949 | return build_binary_op (EXPR_LOCATION (expr), |
3950 | NE_EXPR, expr, fixed_zero_node, 1); | |
9421ebb9 | 3951 | } |
3952 | ||
8e70fb09 | 3953 | return build_binary_op (EXPR_LOCATION (expr), |
3954 | NE_EXPR, expr, integer_zero_node, 1); | |
b0fc3e72 | 3955 | } |
3956 | \f | |
3237155d | 3957 | static void def_builtin_1 (enum built_in_function fncode, |
3958 | const char *name, | |
3959 | enum built_in_class fnclass, | |
3960 | tree fntype, tree libtype, | |
3961 | bool both_p, bool fallback_p, bool nonansi_p, | |
3962 | tree fnattrs, bool implicit_p); | |
0d4238dc | 3963 | |
a5b1863e | 3964 | |
3965 | /* Apply the TYPE_QUALS to the new DECL. */ | |
3966 | ||
3967 | void | |
1cae46be | 3968 | c_apply_type_quals_to_decl (int type_quals, tree decl) |
a5b1863e | 3969 | { |
adfb367f | 3970 | tree type = TREE_TYPE (decl); |
b27ac6b5 | 3971 | |
e4eabbe4 | 3972 | if (type == error_mark_node) |
3973 | return; | |
adfb367f | 3974 | |
3975 | if (((type_quals & TYPE_QUAL_CONST) | |
3976 | || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
3977 | /* An object declared 'const' is only readonly after it is | |
3978 | initialized. We don't have any way of expressing this currently, | |
3979 | so we need to be conservative and unset TREE_READONLY for types | |
3980 | with constructors. Otherwise aliasing code will ignore stores in | |
3981 | an inline constructor. */ | |
3982 | && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
a5b1863e | 3983 | TREE_READONLY (decl) = 1; |
3984 | if (type_quals & TYPE_QUAL_VOLATILE) | |
3985 | { | |
3986 | TREE_SIDE_EFFECTS (decl) = 1; | |
3987 | TREE_THIS_VOLATILE (decl) = 1; | |
3988 | } | |
d91a20bc | 3989 | if (type_quals & TYPE_QUAL_RESTRICT) |
a5b1863e | 3990 | { |
adfb367f | 3991 | while (type && TREE_CODE (type) == ARRAY_TYPE) |
3992 | /* Allow 'restrict' on arrays of pointers. | |
3993 | FIXME currently we just ignore it. */ | |
3994 | type = TREE_TYPE (type); | |
3995 | if (!type | |
3996 | || !POINTER_TYPE_P (type) | |
3997 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
b0b1af64 | 3998 | error ("invalid use of %<restrict%>"); |
adfb367f | 3999 | else if (flag_strict_aliasing && type == TREE_TYPE (decl)) |
ed83aafb | 4000 | /* Indicate we need to make a unique alias set for this pointer. |
4001 | We can't do it here because it might be pointing to an | |
4002 | incomplete type. */ | |
4003 | DECL_POINTER_ALIAS_SET (decl) = -2; | |
a5b1863e | 4004 | } |
4005 | } | |
4006 | ||
4ee9c684 | 4007 | /* Hash function for the problem of multiple type definitions in |
4008 | different files. This must hash all types that will compare | |
4009 | equal via comptypes to the same value. In practice it hashes | |
0bed3869 | 4010 | on some of the simple stuff and leaves the details to comptypes. */ |
4ee9c684 | 4011 | |
4012 | static hashval_t | |
4013 | c_type_hash (const void *p) | |
4014 | { | |
4015 | int i = 0; | |
4016 | int shift, size; | |
aae87fc3 | 4017 | const_tree const t = (const_tree) p; |
4ee9c684 | 4018 | tree t2; |
4019 | switch (TREE_CODE (t)) | |
4020 | { | |
fbf0afd1 | 4021 | /* For pointers, hash on pointee type plus some swizzling. */ |
2363ef00 | 4022 | case POINTER_TYPE: |
4023 | return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
4024 | /* Hash on number of elements and total size. */ | |
4025 | case ENUMERAL_TYPE: | |
4026 | shift = 3; | |
4027 | t2 = TYPE_VALUES (t); | |
4028 | break; | |
4029 | case RECORD_TYPE: | |
4030 | shift = 0; | |
4031 | t2 = TYPE_FIELDS (t); | |
4032 | break; | |
4033 | case QUAL_UNION_TYPE: | |
4034 | shift = 1; | |
4035 | t2 = TYPE_FIELDS (t); | |
4036 | break; | |
4037 | case UNION_TYPE: | |
4038 | shift = 2; | |
4039 | t2 = TYPE_FIELDS (t); | |
4040 | break; | |
4041 | default: | |
231bd014 | 4042 | gcc_unreachable (); |
4ee9c684 | 4043 | } |
4044 | for (; t2; t2 = TREE_CHAIN (t2)) | |
4045 | i++; | |
78c2e180 | 4046 | /* We might have a VLA here. */ |
4047 | if (TREE_CODE (TYPE_SIZE (t)) != INTEGER_CST) | |
4048 | size = 0; | |
4049 | else | |
4050 | size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
4ee9c684 | 4051 | return ((size << 24) | (i << shift)); |
4052 | } | |
4053 | ||
1ecd4018 | 4054 | static GTY((param_is (union tree_node))) htab_t type_hash_table; |
4055 | ||
b5ba9f3a | 4056 | /* Return the typed-based alias set for T, which may be an expression |
f7c44134 | 4057 | or a type. Return -1 if we don't do anything special. */ |
b5ba9f3a | 4058 | |
32c2fdea | 4059 | alias_set_type |
1cae46be | 4060 | c_common_get_alias_set (tree t) |
b5ba9f3a | 4061 | { |
be4f2de7 | 4062 | tree u; |
4ee9c684 | 4063 | PTR *slot; |
1cae46be | 4064 | |
be4f2de7 | 4065 | /* Permit type-punning when accessing a union, provided the access |
4066 | is directly through the union. For example, this code does not | |
4067 | permit taking the address of a union member and then storing | |
4068 | through it. Even the type-punning allowed here is a GCC | |
4069 | extension, albeit a common and useful one; the C standard says | |
4070 | that such accesses have implementation-defined behavior. */ | |
4071 | for (u = t; | |
4072 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
4073 | u = TREE_OPERAND (u, 0)) | |
4074 | if (TREE_CODE (u) == COMPONENT_REF | |
4075 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
4076 | return 0; | |
1e2513d9 | 4077 | |
9fcc3e54 | 4078 | /* That's all the expressions we handle specially. */ |
84166705 | 4079 | if (!TYPE_P (t)) |
9fcc3e54 | 4080 | return -1; |
4081 | ||
d716ce75 | 4082 | /* The C standard guarantees that any object may be accessed via an |
9fcc3e54 | 4083 | lvalue that has character type. */ |
4084 | if (t == char_type_node | |
4085 | || t == signed_char_type_node | |
4086 | || t == unsigned_char_type_node) | |
f7c44134 | 4087 | return 0; |
a5b1863e | 4088 | |
1607663f | 4089 | /* The C standard specifically allows aliasing between signed and |
4090 | unsigned variants of the same type. We treat the signed | |
4091 | variant as canonical. */ | |
78a8ed03 | 4092 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) |
a8868e19 | 4093 | { |
4070745f | 4094 | tree t1 = c_common_signed_type (t); |
1607663f | 4095 | |
a8868e19 | 4096 | /* t1 == t can happen for boolean nodes which are always unsigned. */ |
4097 | if (t1 != t) | |
4098 | return get_alias_set (t1); | |
4099 | } | |
f7c44134 | 4100 | else if (POINTER_TYPE_P (t)) |
87d2d17e | 4101 | { |
f7c44134 | 4102 | tree t1; |
87d2d17e | 4103 | |
4104 | /* Unfortunately, there is no canonical form of a pointer type. | |
4105 | In particular, if we have `typedef int I', then `int *', and | |
4106 | `I *' are different types. So, we have to pick a canonical | |
4107 | representative. We do this below. | |
44e9fa65 | 4108 | |
40bdc593 | 4109 | Technically, this approach is actually more conservative that |
4110 | it needs to be. In particular, `const int *' and `int *' | |
734c98be | 4111 | should be in different alias sets, according to the C and C++ |
40bdc593 | 4112 | standard, since their types are not the same, and so, |
4113 | technically, an `int **' and `const int **' cannot point at | |
4114 | the same thing. | |
4115 | ||
4ee9c684 | 4116 | But, the standard is wrong. In particular, this code is |
40bdc593 | 4117 | legal C++: |
4118 | ||
a0c938f0 | 4119 | int *ip; |
4120 | int **ipp = &ip; | |
4121 | const int* const* cipp = ipp; | |
40bdc593 | 4122 | |
4ee9c684 | 4123 | And, it doesn't make sense for that to be legal unless you |
40bdc593 | 4124 | can dereference IPP and CIPP. So, we ignore cv-qualifiers on |
4125 | the pointed-to types. This issue has been reported to the | |
4126 | C++ committee. */ | |
211f3116 | 4127 | t1 = build_type_no_quals (t); |
f7c44134 | 4128 | if (t1 != t) |
4129 | return get_alias_set (t1); | |
87d2d17e | 4130 | } |
1e2513d9 | 4131 | |
4ee9c684 | 4132 | /* Handle the case of multiple type nodes referring to "the same" type, |
4133 | which occurs with IMA. These share an alias set. FIXME: Currently only | |
4134 | C90 is handled. (In C99 type compatibility is not transitive, which | |
4135 | complicates things mightily. The alias set splay trees can theoretically | |
4136 | represent this, but insertion is tricky when you consider all the | |
4137 | different orders things might arrive in.) */ | |
4138 | ||
4139 | if (c_language != clk_c || flag_isoc99) | |
4140 | return -1; | |
4141 | ||
0bed3869 | 4142 | /* Save time if there's only one input file. */ |
e08bd2f4 | 4143 | if (num_in_fnames == 1) |
4ee9c684 | 4144 | return -1; |
4145 | ||
4146 | /* Pointers need special handling if they point to any type that | |
4147 | needs special handling (below). */ | |
4148 | if (TREE_CODE (t) == POINTER_TYPE) | |
4149 | { | |
4150 | tree t2; | |
4151 | /* Find bottom type under any nested POINTERs. */ | |
b27ac6b5 | 4152 | for (t2 = TREE_TYPE (t); |
af592f67 | 4153 | TREE_CODE (t2) == POINTER_TYPE; |
4154 | t2 = TREE_TYPE (t2)) | |
4155 | ; | |
b27ac6b5 | 4156 | if (TREE_CODE (t2) != RECORD_TYPE |
af592f67 | 4157 | && TREE_CODE (t2) != ENUMERAL_TYPE |
4158 | && TREE_CODE (t2) != QUAL_UNION_TYPE | |
4159 | && TREE_CODE (t2) != UNION_TYPE) | |
4160 | return -1; | |
4ee9c684 | 4161 | if (TYPE_SIZE (t2) == 0) |
af592f67 | 4162 | return -1; |
4ee9c684 | 4163 | } |
4164 | /* These are the only cases that need special handling. */ | |
b27ac6b5 | 4165 | if (TREE_CODE (t) != RECORD_TYPE |
4ee9c684 | 4166 | && TREE_CODE (t) != ENUMERAL_TYPE |
4167 | && TREE_CODE (t) != QUAL_UNION_TYPE | |
4168 | && TREE_CODE (t) != UNION_TYPE | |
4169 | && TREE_CODE (t) != POINTER_TYPE) | |
4170 | return -1; | |
4171 | /* Undefined? */ | |
4172 | if (TYPE_SIZE (t) == 0) | |
4173 | return -1; | |
4174 | ||
b27ac6b5 | 4175 | /* Look up t in hash table. Only one of the compatible types within each |
4ee9c684 | 4176 | alias set is recorded in the table. */ |
4177 | if (!type_hash_table) | |
1ecd4018 | 4178 | type_hash_table = htab_create_ggc (1021, c_type_hash, |
4ee9c684 | 4179 | (htab_eq) lang_hooks.types_compatible_p, |
4180 | NULL); | |
4181 | slot = htab_find_slot (type_hash_table, t, INSERT); | |
4182 | if (*slot != NULL) | |
ad16cb2c | 4183 | { |
4184 | TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot); | |
4185 | return TYPE_ALIAS_SET ((tree)*slot); | |
4186 | } | |
4ee9c684 | 4187 | else |
4188 | /* Our caller will assign and record (in t) a new alias set; all we need | |
4189 | to do is remember t in the hash table. */ | |
4190 | *slot = t; | |
4191 | ||
f7c44134 | 4192 | return -1; |
b5ba9f3a | 4193 | } |
902b4e01 | 4194 | \f |
d4c4d95c | 4195 | /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the |
d3a4d008 | 4196 | second parameter indicates which OPERATOR is being applied. The COMPLAIN |
4197 | flag controls whether we should diagnose possibly ill-formed | |
4198 | constructs or not. */ | |
908c697e | 4199 | |
902b4e01 | 4200 | tree |
908c697e | 4201 | c_sizeof_or_alignof_type (tree type, bool is_sizeof, int complain) |
902b4e01 | 4202 | { |
d4c4d95c | 4203 | const char *op_name; |
4204 | tree value = NULL; | |
4205 | enum tree_code type_code = TREE_CODE (type); | |
1cae46be | 4206 | |
908c697e | 4207 | op_name = is_sizeof ? "sizeof" : "__alignof__"; |
1cae46be | 4208 | |
d4c4d95c | 4209 | if (type_code == FUNCTION_TYPE) |
902b4e01 | 4210 | { |
908c697e | 4211 | if (is_sizeof) |
d4c4d95c | 4212 | { |
d3a4d008 | 4213 | if (complain && (pedantic || warn_pointer_arith)) |
21ca8540 | 4214 | pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith, |
8864917d | 4215 | "invalid application of %<sizeof%> to a function type"); |
ebd21de4 | 4216 | else if (!complain) |
4217 | return error_mark_node; | |
d4c4d95c | 4218 | value = size_one_node; |
4219 | } | |
4220 | else | |
4221 | value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
4222 | } | |
4223 | else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
4224 | { | |
1cae46be | 4225 | if (type_code == VOID_TYPE |
d3a4d008 | 4226 | && complain && (pedantic || warn_pointer_arith)) |
21ca8540 | 4227 | pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith, |
8864917d | 4228 | "invalid application of %qs to a void type", op_name); |
ebd21de4 | 4229 | else if (!complain) |
4230 | return error_mark_node; | |
d4c4d95c | 4231 | value = size_one_node; |
902b4e01 | 4232 | } |
902b4e01 | 4233 | else if (!COMPLETE_TYPE_P (type)) |
4234 | { | |
d3a4d008 | 4235 | if (complain) |
b0b1af64 | 4236 | error ("invalid application of %qs to incomplete type %qT ", |
3ad0e8cc | 4237 | op_name, type); |
d4c4d95c | 4238 | value = size_zero_node; |
902b4e01 | 4239 | } |
4240 | else | |
d4c4d95c | 4241 | { |
908c697e | 4242 | if (is_sizeof) |
d4c4d95c | 4243 | /* Convert in case a char is more than one unit. */ |
4244 | value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
4245 | size_int (TYPE_PRECISION (char_type_node) | |
4246 | / BITS_PER_UNIT)); | |
4247 | else | |
d37625c0 | 4248 | value = size_int (TYPE_ALIGN_UNIT (type)); |
d4c4d95c | 4249 | } |
902b4e01 | 4250 | |
d4c4d95c | 4251 | /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. |
4252 | TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
4253 | never happen. However, this node should really have type | |
4254 | `size_t', which is just a typedef for an ordinary integer type. */ | |
143d62d7 | 4255 | value = fold_convert (size_type_node, value); |
1d8fc210 | 4256 | gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value))); |
1cae46be | 4257 | |
d4c4d95c | 4258 | return value; |
902b4e01 | 4259 | } |
4260 | ||
4261 | /* Implement the __alignof keyword: Return the minimum required | |
097b5c8b | 4262 | alignment of EXPR, measured in bytes. For VAR_DECLs, |
4263 | FUNCTION_DECLs and FIELD_DECLs return DECL_ALIGN (which can be set | |
4264 | from an "aligned" __attribute__ specification). */ | |
72040e7e | 4265 | |
902b4e01 | 4266 | tree |
1cae46be | 4267 | c_alignof_expr (tree expr) |
902b4e01 | 4268 | { |
4269 | tree t; | |
4270 | ||
097b5c8b | 4271 | if (VAR_OR_FUNCTION_DECL_P (expr)) |
d37625c0 | 4272 | t = size_int (DECL_ALIGN_UNIT (expr)); |
1cae46be | 4273 | |
902b4e01 | 4274 | else if (TREE_CODE (expr) == COMPONENT_REF |
4275 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
4276 | { | |
b0b1af64 | 4277 | error ("%<__alignof%> applied to a bit-field"); |
902b4e01 | 4278 | t = size_one_node; |
4279 | } | |
4280 | else if (TREE_CODE (expr) == COMPONENT_REF | |
7cc7e163 | 4281 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) |
d37625c0 | 4282 | t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1))); |
1cae46be | 4283 | |
902b4e01 | 4284 | else if (TREE_CODE (expr) == INDIRECT_REF) |
4285 | { | |
4286 | tree t = TREE_OPERAND (expr, 0); | |
4287 | tree best = t; | |
4288 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
1cae46be | 4289 | |
72dd6141 | 4290 | while (CONVERT_EXPR_P (t) |
7cc7e163 | 4291 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) |
902b4e01 | 4292 | { |
4293 | int thisalign; | |
4294 | ||
4295 | t = TREE_OPERAND (t, 0); | |
4296 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
4297 | if (thisalign > bestalign) | |
4298 | best = t, bestalign = thisalign; | |
4299 | } | |
4300 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
4301 | } | |
4302 | else | |
4303 | return c_alignof (TREE_TYPE (expr)); | |
4304 | ||
143d62d7 | 4305 | return fold_convert (size_type_node, t); |
902b4e01 | 4306 | } |
4307 | \f | |
8fe4a266 | 4308 | /* Handle C and C++ default attributes. */ |
4309 | ||
4310 | enum built_in_attribute | |
4311 | { | |
4312 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
4313 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
4314 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
4315 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
8fe4a266 | 4316 | #include "builtin-attrs.def" |
4317 | #undef DEF_ATTR_NULL_TREE | |
4318 | #undef DEF_ATTR_INT | |
4319 | #undef DEF_ATTR_IDENT | |
4320 | #undef DEF_ATTR_TREE_LIST | |
8fe4a266 | 4321 | ATTR_LAST |
4322 | }; | |
4323 | ||
4324 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
4325 | ||
1cae46be | 4326 | static void c_init_attributes (void); |
8fe4a266 | 4327 | |
27213ba3 | 4328 | enum c_builtin_type |
72040e7e | 4329 | { |
d2d4bdde | 4330 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, |
4331 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
4332 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
4333 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
4334 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
4335 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
0a39fd54 | 4336 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, |
27213ba3 | 4337 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, |
4338 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
d2d4bdde | 4339 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
4340 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
4341 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
03901330 | 4342 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
0a39fd54 | 4343 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, |
4344 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
4345 | NAME, | |
d2d4bdde | 4346 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
4347 | #include "builtin-types.def" | |
4348 | #undef DEF_PRIMITIVE_TYPE | |
4349 | #undef DEF_FUNCTION_TYPE_0 | |
4350 | #undef DEF_FUNCTION_TYPE_1 | |
4351 | #undef DEF_FUNCTION_TYPE_2 | |
4352 | #undef DEF_FUNCTION_TYPE_3 | |
4353 | #undef DEF_FUNCTION_TYPE_4 | |
0a39fd54 | 4354 | #undef DEF_FUNCTION_TYPE_5 |
4355 | #undef DEF_FUNCTION_TYPE_6 | |
27213ba3 | 4356 | #undef DEF_FUNCTION_TYPE_7 |
d2d4bdde | 4357 | #undef DEF_FUNCTION_TYPE_VAR_0 |
4358 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
4359 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
03901330 | 4360 | #undef DEF_FUNCTION_TYPE_VAR_3 |
0a39fd54 | 4361 | #undef DEF_FUNCTION_TYPE_VAR_4 |
4362 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
d2d4bdde | 4363 | #undef DEF_POINTER_TYPE |
27213ba3 | 4364 | BT_LAST |
4365 | }; | |
4366 | ||
4367 | typedef enum c_builtin_type builtin_type; | |
d2d4bdde | 4368 | |
27213ba3 | 4369 | /* A temporary array for c_common_nodes_and_builtins. Used in |
4370 | communication with def_fn_type. */ | |
4371 | static tree builtin_types[(int) BT_LAST + 1]; | |
d2d4bdde | 4372 | |
27213ba3 | 4373 | /* A helper function for c_common_nodes_and_builtins. Build function type |
4374 | for DEF with return type RET and N arguments. If VAR is true, then the | |
4375 | function should be variadic after those N arguments. | |
4376 | ||
4377 | Takes special care not to ICE if any of the types involved are | |
4378 | error_mark_node, which indicates that said type is not in fact available | |
4379 | (see builtin_type_for_size). In which case the function type as a whole | |
4380 | should be error_mark_node. */ | |
4381 | ||
4382 | static void | |
4383 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
4384 | { | |
4385 | tree args = NULL, t; | |
4386 | va_list list; | |
4387 | int i; | |
4388 | ||
4389 | va_start (list, n); | |
4390 | for (i = 0; i < n; ++i) | |
4391 | { | |
7d339f93 | 4392 | builtin_type a = (builtin_type) va_arg (list, int); |
27213ba3 | 4393 | t = builtin_types[a]; |
4394 | if (t == error_mark_node) | |
4395 | goto egress; | |
4396 | args = tree_cons (NULL_TREE, t, args); | |
4397 | } | |
4398 | va_end (list); | |
4399 | ||
4400 | args = nreverse (args); | |
4401 | if (!var) | |
4402 | args = chainon (args, void_list_node); | |
4403 | ||
4404 | t = builtin_types[ret]; | |
4405 | if (t == error_mark_node) | |
4406 | goto egress; | |
4407 | t = build_function_type (t, args); | |
4408 | ||
4409 | egress: | |
4410 | builtin_types[def] = t; | |
4411 | } | |
4412 | ||
dce22712 | 4413 | /* Build builtin functions common to both C and C++ language |
4414 | frontends. */ | |
4415 | ||
4416 | static void | |
4417 | c_define_builtins (tree va_list_ref_type_node, tree va_list_arg_type_node) | |
4418 | { | |
4419 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
4420 | builtin_types[ENUM] = VALUE; | |
4421 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
4422 | def_fn_type (ENUM, RETURN, 0, 0); | |
4423 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
4424 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
4425 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
4426 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
4427 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
4428 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
4429 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
4430 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
4431 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
4432 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
4433 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
4434 | ARG6) \ | |
4435 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
4436 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
4437 | ARG6, ARG7) \ | |
4438 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
4439 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
4440 | def_fn_type (ENUM, RETURN, 1, 0); | |
4441 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
4442 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
4443 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
4444 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
4445 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
4446 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
4447 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
4448 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
4449 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
4450 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
4451 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
4452 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
4453 | ||
4454 | #include "builtin-types.def" | |
4455 | ||
4456 | #undef DEF_PRIMITIVE_TYPE | |
4457 | #undef DEF_FUNCTION_TYPE_1 | |
4458 | #undef DEF_FUNCTION_TYPE_2 | |
4459 | #undef DEF_FUNCTION_TYPE_3 | |
4460 | #undef DEF_FUNCTION_TYPE_4 | |
4461 | #undef DEF_FUNCTION_TYPE_5 | |
4462 | #undef DEF_FUNCTION_TYPE_6 | |
4463 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
4464 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
4465 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
4466 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
4467 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
4468 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
4469 | #undef DEF_POINTER_TYPE | |
4470 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
4471 | ||
4472 | c_init_attributes (); | |
4473 | ||
4474 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
4475 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
4476 | if (NAME && COND) \ | |
4477 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
4478 | builtin_types[(int) TYPE], \ | |
4479 | builtin_types[(int) LIBTYPE], \ | |
4480 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
4481 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
4482 | #include "builtins.def" | |
4483 | #undef DEF_BUILTIN | |
4484 | ||
87eb1c28 | 4485 | targetm.init_builtins (); |
4486 | ||
dce22712 | 4487 | build_common_builtin_nodes (); |
4488 | ||
dce22712 | 4489 | if (flag_mudflap) |
4490 | mudflap_init (); | |
4491 | } | |
4492 | ||
27213ba3 | 4493 | /* Build tree nodes and builtin functions common to both C and C++ language |
4494 | frontends. */ | |
4495 | ||
4496 | void | |
4497 | c_common_nodes_and_builtins (void) | |
4498 | { | |
924bbf02 | 4499 | int char16_type_size; |
4500 | int char32_type_size; | |
174fcc61 | 4501 | int wchar_type_size; |
4502 | tree array_domain_type; | |
2d47cc32 | 4503 | tree va_list_ref_type_node; |
8a15c04a | 4504 | tree va_list_arg_type_node; |
a66c9326 | 4505 | |
174fcc61 | 4506 | /* Define `int' and `char' first so that dbx will output them first. */ |
d946ea19 | 4507 | record_builtin_type (RID_INT, NULL, integer_type_node); |
174fcc61 | 4508 | record_builtin_type (RID_CHAR, "char", char_type_node); |
4509 | ||
4510 | /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
4511 | "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
4512 | but not C. Are the conditionals here needed? */ | |
c0f19401 | 4513 | if (c_dialect_cxx ()) |
d946ea19 | 4514 | record_builtin_type (RID_SIGNED, NULL, integer_type_node); |
174fcc61 | 4515 | record_builtin_type (RID_LONG, "long int", long_integer_type_node); |
4516 | record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
4517 | record_builtin_type (RID_MAX, "long unsigned int", | |
4518 | long_unsigned_type_node); | |
c0f19401 | 4519 | if (c_dialect_cxx ()) |
174fcc61 | 4520 | record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); |
4521 | record_builtin_type (RID_MAX, "long long int", | |
4522 | long_long_integer_type_node); | |
4523 | record_builtin_type (RID_MAX, "long long unsigned int", | |
4524 | long_long_unsigned_type_node); | |
c0f19401 | 4525 | if (c_dialect_cxx ()) |
174fcc61 | 4526 | record_builtin_type (RID_MAX, "long long unsigned", |
4527 | long_long_unsigned_type_node); | |
4528 | record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
4529 | record_builtin_type (RID_MAX, "short unsigned int", | |
4530 | short_unsigned_type_node); | |
c0f19401 | 4531 | if (c_dialect_cxx ()) |
174fcc61 | 4532 | record_builtin_type (RID_MAX, "unsigned short", |
4533 | short_unsigned_type_node); | |
4534 | ||
4535 | /* Define both `signed char' and `unsigned char'. */ | |
4536 | record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
4537 | record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
4538 | ||
771d21fa | 4539 | /* These are types that c_common_type_for_size and |
4540 | c_common_type_for_mode use. */ | |
dc24ddbd | 4541 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
4542 | intQI_type_node)); | |
4543 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4544 | intHI_type_node)); | |
4545 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4546 | intSI_type_node)); | |
4547 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4548 | intDI_type_node)); | |
174fcc61 | 4549 | #if HOST_BITS_PER_WIDE_INT >= 64 |
f1515a39 | 4550 | if (targetm.scalar_mode_supported_p (TImode)) |
4551 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
4552 | get_identifier ("__int128_t"), | |
4553 | intTI_type_node)); | |
174fcc61 | 4554 | #endif |
dc24ddbd | 4555 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
4556 | unsigned_intQI_type_node)); | |
4557 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4558 | unsigned_intHI_type_node)); | |
4559 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4560 | unsigned_intSI_type_node)); | |
4561 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
4562 | unsigned_intDI_type_node)); | |
174fcc61 | 4563 | #if HOST_BITS_PER_WIDE_INT >= 64 |
f1515a39 | 4564 | if (targetm.scalar_mode_supported_p (TImode)) |
4565 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
4566 | get_identifier ("__uint128_t"), | |
4567 | unsigned_intTI_type_node)); | |
174fcc61 | 4568 | #endif |
4569 | ||
4570 | /* Create the widest literal types. */ | |
4571 | widest_integer_literal_type_node | |
4572 | = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 4573 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
4574 | widest_integer_literal_type_node)); | |
174fcc61 | 4575 | |
4576 | widest_unsigned_literal_type_node | |
4577 | = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 4578 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
4579 | widest_unsigned_literal_type_node)); | |
174fcc61 | 4580 | |
4581 | /* `unsigned long' is the standard type for sizeof. | |
4582 | Note that stddef.h uses `unsigned long', | |
4583 | and this must agree, even if long and int are the same size. */ | |
654ef926 | 4584 | size_type_node = |
174fcc61 | 4585 | TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); |
654ef926 | 4586 | signed_size_type_node = c_common_signed_type (size_type_node); |
4587 | set_sizetype (size_type_node); | |
174fcc61 | 4588 | |
73673831 | 4589 | pid_type_node = |
4590 | TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
4591 | ||
174fcc61 | 4592 | build_common_tree_nodes_2 (flag_short_double); |
4593 | ||
d946ea19 | 4594 | record_builtin_type (RID_FLOAT, NULL, float_type_node); |
4595 | record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
174fcc61 | 4596 | record_builtin_type (RID_MAX, "long double", long_double_type_node); |
4597 | ||
c4503c0a | 4598 | /* Only supported decimal floating point extension if the target |
4599 | actually supports underlying modes. */ | |
4600 | if (targetm.scalar_mode_supported_p (SDmode) | |
4601 | && targetm.scalar_mode_supported_p (DDmode) | |
4602 | && targetm.scalar_mode_supported_p (TDmode)) | |
4603 | { | |
4604 | record_builtin_type (RID_DFLOAT32, NULL, dfloat32_type_node); | |
4605 | record_builtin_type (RID_DFLOAT64, NULL, dfloat64_type_node); | |
4606 | record_builtin_type (RID_DFLOAT128, NULL, dfloat128_type_node); | |
4607 | } | |
4608 | ||
9421ebb9 | 4609 | if (targetm.fixed_point_supported_p ()) |
4610 | { | |
4611 | record_builtin_type (RID_MAX, "short _Fract", short_fract_type_node); | |
4612 | record_builtin_type (RID_FRACT, NULL, fract_type_node); | |
4613 | record_builtin_type (RID_MAX, "long _Fract", long_fract_type_node); | |
4614 | record_builtin_type (RID_MAX, "long long _Fract", | |
4615 | long_long_fract_type_node); | |
4616 | record_builtin_type (RID_MAX, "unsigned short _Fract", | |
4617 | unsigned_short_fract_type_node); | |
4618 | record_builtin_type (RID_MAX, "unsigned _Fract", | |
4619 | unsigned_fract_type_node); | |
4620 | record_builtin_type (RID_MAX, "unsigned long _Fract", | |
4621 | unsigned_long_fract_type_node); | |
4622 | record_builtin_type (RID_MAX, "unsigned long long _Fract", | |
4623 | unsigned_long_long_fract_type_node); | |
4624 | record_builtin_type (RID_MAX, "_Sat short _Fract", | |
4625 | sat_short_fract_type_node); | |
4626 | record_builtin_type (RID_MAX, "_Sat _Fract", sat_fract_type_node); | |
4627 | record_builtin_type (RID_MAX, "_Sat long _Fract", | |
4628 | sat_long_fract_type_node); | |
4629 | record_builtin_type (RID_MAX, "_Sat long long _Fract", | |
4630 | sat_long_long_fract_type_node); | |
4631 | record_builtin_type (RID_MAX, "_Sat unsigned short _Fract", | |
4632 | sat_unsigned_short_fract_type_node); | |
4633 | record_builtin_type (RID_MAX, "_Sat unsigned _Fract", | |
4634 | sat_unsigned_fract_type_node); | |
4635 | record_builtin_type (RID_MAX, "_Sat unsigned long _Fract", | |
4636 | sat_unsigned_long_fract_type_node); | |
4637 | record_builtin_type (RID_MAX, "_Sat unsigned long long _Fract", | |
4638 | sat_unsigned_long_long_fract_type_node); | |
4639 | record_builtin_type (RID_MAX, "short _Accum", short_accum_type_node); | |
4640 | record_builtin_type (RID_ACCUM, NULL, accum_type_node); | |
4641 | record_builtin_type (RID_MAX, "long _Accum", long_accum_type_node); | |
4642 | record_builtin_type (RID_MAX, "long long _Accum", | |
4643 | long_long_accum_type_node); | |
4644 | record_builtin_type (RID_MAX, "unsigned short _Accum", | |
4645 | unsigned_short_accum_type_node); | |
4646 | record_builtin_type (RID_MAX, "unsigned _Accum", | |
4647 | unsigned_accum_type_node); | |
4648 | record_builtin_type (RID_MAX, "unsigned long _Accum", | |
4649 | unsigned_long_accum_type_node); | |
4650 | record_builtin_type (RID_MAX, "unsigned long long _Accum", | |
4651 | unsigned_long_long_accum_type_node); | |
4652 | record_builtin_type (RID_MAX, "_Sat short _Accum", | |
4653 | sat_short_accum_type_node); | |
4654 | record_builtin_type (RID_MAX, "_Sat _Accum", sat_accum_type_node); | |
4655 | record_builtin_type (RID_MAX, "_Sat long _Accum", | |
4656 | sat_long_accum_type_node); | |
4657 | record_builtin_type (RID_MAX, "_Sat long long _Accum", | |
4658 | sat_long_long_accum_type_node); | |
4659 | record_builtin_type (RID_MAX, "_Sat unsigned short _Accum", | |
4660 | sat_unsigned_short_accum_type_node); | |
4661 | record_builtin_type (RID_MAX, "_Sat unsigned _Accum", | |
4662 | sat_unsigned_accum_type_node); | |
4663 | record_builtin_type (RID_MAX, "_Sat unsigned long _Accum", | |
4664 | sat_unsigned_long_accum_type_node); | |
4665 | record_builtin_type (RID_MAX, "_Sat unsigned long long _Accum", | |
4666 | sat_unsigned_long_long_accum_type_node); | |
4667 | ||
4668 | } | |
4669 | ||
dc24ddbd | 4670 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
4671 | get_identifier ("complex int"), | |
4672 | complex_integer_type_node)); | |
4673 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
4674 | get_identifier ("complex float"), | |
4675 | complex_float_type_node)); | |
4676 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
4677 | get_identifier ("complex double"), | |
4678 | complex_double_type_node)); | |
4679 | lang_hooks.decls.pushdecl | |
20325f61 | 4680 | (build_decl (TYPE_DECL, get_identifier ("complex long double"), |
4681 | complex_long_double_type_node)); | |
174fcc61 | 4682 | |
e256d445 | 4683 | if (c_dialect_cxx ()) |
4684 | /* For C++, make fileptr_type_node a distinct void * type until | |
4685 | FILE type is defined. */ | |
e086912e | 4686 | fileptr_type_node = build_variant_type_copy (ptr_type_node); |
e256d445 | 4687 | |
d946ea19 | 4688 | record_builtin_type (RID_VOID, NULL, void_type_node); |
174fcc61 | 4689 | |
6753bca0 | 4690 | /* Set the TYPE_NAME for any variants that were built before |
4691 | record_builtin_type gave names to the built-in types. */ | |
4692 | { | |
4693 | tree void_name = TYPE_NAME (void_type_node); | |
4694 | TYPE_NAME (void_type_node) = NULL_TREE; | |
4695 | TYPE_NAME (build_qualified_type (void_type_node, TYPE_QUAL_CONST)) | |
4696 | = void_name; | |
4697 | TYPE_NAME (void_type_node) = void_name; | |
4698 | } | |
4699 | ||
fbf0afd1 | 4700 | /* This node must not be shared. */ |
7c446c95 | 4701 | void_zero_node = make_node (INTEGER_CST); |
d2d4bdde | 4702 | TREE_TYPE (void_zero_node) = void_type_node; |
4703 | ||
174fcc61 | 4704 | void_list_node = build_void_list_node (); |
4705 | ||
4706 | /* Make a type to be the domain of a few array types | |
4707 | whose domains don't really matter. | |
4708 | 200 is small enough that it always fits in size_t | |
4709 | and large enough that it can hold most function names for the | |
4710 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
4711 | array_domain_type = build_index_type (size_int (200)); | |
4712 | ||
4713 | /* Make a type for arrays of characters. | |
4714 | With luck nothing will ever really depend on the length of this | |
4715 | array type. */ | |
4716 | char_array_type_node | |
4717 | = build_array_type (char_type_node, array_domain_type); | |
4718 | ||
4719 | /* Likewise for arrays of ints. */ | |
4720 | int_array_type_node | |
4721 | = build_array_type (integer_type_node, array_domain_type); | |
4722 | ||
d2d4bdde | 4723 | string_type_node = build_pointer_type (char_type_node); |
4724 | const_string_type_node | |
4725 | = build_pointer_type (build_qualified_type | |
4726 | (char_type_node, TYPE_QUAL_CONST)); | |
4727 | ||
174fcc61 | 4728 | /* This is special for C++ so functions can be overloaded. */ |
18ef7ac2 | 4729 | wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); |
174fcc61 | 4730 | wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); |
4731 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
c0f19401 | 4732 | if (c_dialect_cxx ()) |
174fcc61 | 4733 | { |
78a8ed03 | 4734 | if (TYPE_UNSIGNED (wchar_type_node)) |
174fcc61 | 4735 | wchar_type_node = make_unsigned_type (wchar_type_size); |
4736 | else | |
4737 | wchar_type_node = make_signed_type (wchar_type_size); | |
4738 | record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
4739 | } | |
4740 | else | |
4741 | { | |
4070745f | 4742 | signed_wchar_type_node = c_common_signed_type (wchar_type_node); |
11773141 | 4743 | unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node); |
174fcc61 | 4744 | } |
4745 | ||
4746 | /* This is for wide string constants. */ | |
4747 | wchar_array_type_node | |
4748 | = build_array_type (wchar_type_node, array_domain_type); | |
4749 | ||
924bbf02 | 4750 | /* Define 'char16_t'. */ |
4751 | char16_type_node = get_identifier (CHAR16_TYPE); | |
4752 | char16_type_node = TREE_TYPE (identifier_global_value (char16_type_node)); | |
4753 | char16_type_size = TYPE_PRECISION (char16_type_node); | |
4754 | if (c_dialect_cxx ()) | |
4755 | { | |
4756 | char16_type_node = make_unsigned_type (char16_type_size); | |
4757 | ||
4758 | if (cxx_dialect == cxx0x) | |
4759 | record_builtin_type (RID_CHAR16, "char16_t", char16_type_node); | |
4760 | } | |
4761 | ||
4762 | /* This is for UTF-16 string constants. */ | |
4763 | char16_array_type_node | |
4764 | = build_array_type (char16_type_node, array_domain_type); | |
4765 | ||
4766 | /* Define 'char32_t'. */ | |
4767 | char32_type_node = get_identifier (CHAR32_TYPE); | |
4768 | char32_type_node = TREE_TYPE (identifier_global_value (char32_type_node)); | |
4769 | char32_type_size = TYPE_PRECISION (char32_type_node); | |
4770 | if (c_dialect_cxx ()) | |
4771 | { | |
4772 | char32_type_node = make_unsigned_type (char32_type_size); | |
4773 | ||
4774 | if (cxx_dialect == cxx0x) | |
4775 | record_builtin_type (RID_CHAR32, "char32_t", char32_type_node); | |
4776 | } | |
4777 | ||
4778 | /* This is for UTF-32 string constants. */ | |
4779 | char32_array_type_node | |
4780 | = build_array_type (char32_type_node, array_domain_type); | |
4781 | ||
6bf5ed8d | 4782 | wint_type_node = |
4783 | TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
4784 | ||
4785 | intmax_type_node = | |
4786 | TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
4787 | uintmax_type_node = | |
4788 | TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
4789 | ||
4790 | default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
4791 | ptrdiff_type_node | |
4792 | = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
11773141 | 4793 | unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); |
6bf5ed8d | 4794 | |
dc24ddbd | 4795 | lang_hooks.decls.pushdecl |
20325f61 | 4796 | (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"), |
4797 | va_list_type_node)); | |
5f57a8b1 | 4798 | #ifdef TARGET_ENUM_VA_LIST |
4799 | { | |
4800 | int l; | |
4801 | const char *pname; | |
4802 | tree ptype; | |
4803 | for (l = 0; TARGET_ENUM_VA_LIST (l, &pname, &ptype); ++l) | |
4804 | { | |
4805 | lang_hooks.decls.pushdecl | |
4806 | (build_decl (TYPE_DECL, get_identifier (pname), | |
4807 | ptype)); | |
4808 | ||
4809 | } | |
4810 | } | |
4811 | #endif | |
8a15c04a | 4812 | |
8a15c04a | 4813 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
2d47cc32 | 4814 | { |
4815 | va_list_arg_type_node = va_list_ref_type_node = | |
4816 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
4817 | } | |
8a15c04a | 4818 | else |
2d47cc32 | 4819 | { |
4820 | va_list_arg_type_node = va_list_type_node; | |
4821 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
4822 | } | |
1cae46be | 4823 | |
dce22712 | 4824 | if (!flag_preprocess_only) |
4825 | c_define_builtins (va_list_ref_type_node, va_list_arg_type_node); | |
ffa8918b | 4826 | |
5c62f199 | 4827 | main_identifier_node = get_identifier ("main"); |
ae84079f | 4828 | |
4829 | /* Create the built-in __null node. It is important that this is | |
4830 | not shared. */ | |
4831 | null_node = make_node (INTEGER_CST); | |
4832 | TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0); | |
27213ba3 | 4833 | |
4834 | /* Since builtin_types isn't gc'ed, don't export these nodes. */ | |
4835 | memset (builtin_types, 0, sizeof (builtin_types)); | |
72040e7e | 4836 | } |
a66c9326 | 4837 | |
46a7e216 | 4838 | /* Look up the function in built_in_decls that corresponds to DECL |
4839 | and set ASMSPEC as its user assembler name. DECL must be a | |
f7f07c95 | 4840 | function decl that declares a builtin. */ |
46a7e216 | 4841 | |
4842 | void | |
4843 | set_builtin_user_assembler_name (tree decl, const char *asmspec) | |
4844 | { | |
4845 | tree builtin; | |
4846 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
4847 | && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL | |
4848 | && asmspec != 0); | |
4849 | ||
4850 | builtin = built_in_decls [DECL_FUNCTION_CODE (decl)]; | |
4851 | set_user_assembler_name (builtin, asmspec); | |
979d3efc | 4852 | switch (DECL_FUNCTION_CODE (decl)) |
4853 | { | |
4854 | case BUILT_IN_MEMCPY: | |
4855 | init_block_move_fn (asmspec); | |
4856 | memcpy_libfunc = set_user_assembler_libfunc ("memcpy", asmspec); | |
4857 | break; | |
4858 | case BUILT_IN_MEMSET: | |
4859 | init_block_clear_fn (asmspec); | |
4860 | memset_libfunc = set_user_assembler_libfunc ("memset", asmspec); | |
4861 | break; | |
4862 | case BUILT_IN_MEMMOVE: | |
4863 | memmove_libfunc = set_user_assembler_libfunc ("memmove", asmspec); | |
4864 | break; | |
4865 | case BUILT_IN_MEMCMP: | |
4866 | memcmp_libfunc = set_user_assembler_libfunc ("memcmp", asmspec); | |
4867 | break; | |
4868 | case BUILT_IN_ABORT: | |
4869 | abort_libfunc = set_user_assembler_libfunc ("abort", asmspec); | |
4870 | break; | |
4871 | default: | |
4872 | break; | |
4873 | } | |
46a7e216 | 4874 | } |
4875 | ||
79b01846 | 4876 | /* The number of named compound-literals generated thus far. */ |
4877 | static GTY(()) int compound_literal_number; | |
4878 | ||
4879 | /* Set DECL_NAME for DECL, a VAR_DECL for a compound-literal. */ | |
4880 | ||
4881 | void | |
4882 | set_compound_literal_name (tree decl) | |
4883 | { | |
4884 | char *name; | |
4885 | ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", | |
4886 | compound_literal_number); | |
4887 | compound_literal_number++; | |
4888 | DECL_NAME (decl) = get_identifier (name); | |
4889 | } | |
4890 | ||
a66c9326 | 4891 | tree |
1cae46be | 4892 | build_va_arg (tree expr, tree type) |
a66c9326 | 4893 | { |
4894 | return build1 (VA_ARG_EXPR, type, expr); | |
4895 | } | |
0d4238dc | 4896 | |
4897 | ||
dd878098 | 4898 | /* Linked list of disabled built-in functions. */ |
4899 | ||
4900 | typedef struct disabled_builtin | |
4901 | { | |
4902 | const char *name; | |
4903 | struct disabled_builtin *next; | |
4904 | } disabled_builtin; | |
4905 | static disabled_builtin *disabled_builtins = NULL; | |
4906 | ||
1cae46be | 4907 | static bool builtin_function_disabled_p (const char *); |
dd878098 | 4908 | |
4909 | /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
4910 | begins with "__builtin_", give an error. */ | |
4911 | ||
4912 | void | |
1cae46be | 4913 | disable_builtin_function (const char *name) |
dd878098 | 4914 | { |
4915 | if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
b0b1af64 | 4916 | error ("cannot disable built-in function %qs", name); |
dd878098 | 4917 | else |
4918 | { | |
e85905e5 | 4919 | disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin); |
4920 | new_disabled_builtin->name = name; | |
4921 | new_disabled_builtin->next = disabled_builtins; | |
4922 | disabled_builtins = new_disabled_builtin; | |
dd878098 | 4923 | } |
4924 | } | |
4925 | ||
4926 | ||
4927 | /* Return true if the built-in function NAME has been disabled, false | |
4928 | otherwise. */ | |
4929 | ||
4930 | static bool | |
1cae46be | 4931 | builtin_function_disabled_p (const char *name) |
dd878098 | 4932 | { |
4933 | disabled_builtin *p; | |
4934 | for (p = disabled_builtins; p != NULL; p = p->next) | |
4935 | { | |
4936 | if (strcmp (name, p->name) == 0) | |
4937 | return true; | |
4938 | } | |
4939 | return false; | |
4940 | } | |
4941 | ||
4942 | ||
3237155d | 4943 | /* Worker for DEF_BUILTIN. |
4944 | Possibly define a builtin function with one or two names. | |
4945 | Does not declare a non-__builtin_ function if flag_no_builtin, or if | |
4946 | nonansi_p and flag_no_nonansi_builtin. */ | |
0d4238dc | 4947 | |
3237155d | 4948 | static void |
4949 | def_builtin_1 (enum built_in_function fncode, | |
4950 | const char *name, | |
4951 | enum built_in_class fnclass, | |
4952 | tree fntype, tree libtype, | |
4953 | bool both_p, bool fallback_p, bool nonansi_p, | |
4954 | tree fnattrs, bool implicit_p) | |
0d4238dc | 4955 | { |
3237155d | 4956 | tree decl; |
4957 | const char *libname; | |
4958 | ||
27213ba3 | 4959 | if (fntype == error_mark_node) |
4960 | return; | |
4961 | ||
3237155d | 4962 | gcc_assert ((!both_p && !fallback_p) |
4963 | || !strncmp (name, "__builtin_", | |
4964 | strlen ("__builtin_"))); | |
4965 | ||
4966 | libname = name + strlen ("__builtin_"); | |
54be5d7e | 4967 | decl = add_builtin_function (name, fntype, fncode, fnclass, |
4968 | (fallback_p ? libname : NULL), | |
4969 | fnattrs); | |
3237155d | 4970 | if (both_p |
4971 | && !flag_no_builtin && !builtin_function_disabled_p (libname) | |
dd878098 | 4972 | && !(nonansi_p && flag_no_nonansi_builtin)) |
54be5d7e | 4973 | add_builtin_function (libname, libtype, fncode, fnclass, |
4974 | NULL, fnattrs); | |
a40609e6 | 4975 | |
3237155d | 4976 | built_in_decls[(int) fncode] = decl; |
4977 | if (implicit_p) | |
4978 | implicit_built_in_decls[(int) fncode] = decl; | |
0d4238dc | 4979 | } |
e94026da | 4980 | \f |
d7aeef06 | 4981 | /* Nonzero if the type T promotes to int. This is (nearly) the |
4982 | integral promotions defined in ISO C99 6.3.1.1/2. */ | |
4983 | ||
4984 | bool | |
9f627b1a | 4985 | c_promoting_integer_type_p (const_tree t) |
d7aeef06 | 4986 | { |
4987 | switch (TREE_CODE (t)) | |
4988 | { | |
4989 | case INTEGER_TYPE: | |
4990 | return (TYPE_MAIN_VARIANT (t) == char_type_node | |
4991 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
4992 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
4993 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
7aa1e6eb | 4994 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node |
4995 | || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
d7aeef06 | 4996 | |
4997 | case ENUMERAL_TYPE: | |
4998 | /* ??? Technically all enumerations not larger than an int | |
4999 | promote to an int. But this is used along code paths | |
5000 | that only want to notice a size change. */ | |
5001 | return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
5002 | ||
5003 | case BOOLEAN_TYPE: | |
5004 | return 1; | |
5005 | ||
5006 | default: | |
5007 | return 0; | |
5008 | } | |
5009 | } | |
5010 | ||
e94026da | 5011 | /* Return 1 if PARMS specifies a fixed number of parameters |
5012 | and none of their types is affected by default promotions. */ | |
5013 | ||
5014 | int | |
9f627b1a | 5015 | self_promoting_args_p (const_tree parms) |
e94026da | 5016 | { |
9f627b1a | 5017 | const_tree t; |
e94026da | 5018 | for (t = parms; t; t = TREE_CHAIN (t)) |
5019 | { | |
19cb6b50 | 5020 | tree type = TREE_VALUE (t); |
43f74bc4 | 5021 | |
e1d8e198 | 5022 | if (type == error_mark_node) |
5023 | continue; | |
5024 | ||
e94026da | 5025 | if (TREE_CHAIN (t) == 0 && type != void_type_node) |
5026 | return 0; | |
5027 | ||
5028 | if (type == 0) | |
5029 | return 0; | |
5030 | ||
5031 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
5032 | return 0; | |
5033 | ||
d7aeef06 | 5034 | if (c_promoting_integer_type_p (type)) |
e94026da | 5035 | return 0; |
5036 | } | |
5037 | return 1; | |
5038 | } | |
605fb01e | 5039 | |
c10de5e7 | 5040 | /* Recursively remove any '*' or '&' operator from TYPE. */ |
5041 | tree | |
5042 | strip_pointer_operator (tree t) | |
5043 | { | |
5044 | while (POINTER_TYPE_P (t)) | |
5045 | t = TREE_TYPE (t); | |
5046 | return t; | |
5047 | } | |
5048 | ||
57a0ed23 | 5049 | /* Recursively remove pointer or array type from TYPE. */ |
5050 | tree | |
5051 | strip_pointer_or_array_types (tree t) | |
5052 | { | |
5053 | while (TREE_CODE (t) == ARRAY_TYPE || POINTER_TYPE_P (t)) | |
5054 | t = TREE_TYPE (t); | |
5055 | return t; | |
5056 | } | |
5057 | ||
e41f0d80 | 5058 | /* Used to compare case labels. K1 and K2 are actually tree nodes |
5059 | representing case labels, or NULL_TREE for a `default' label. | |
5060 | Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
5061 | K2, and 0 if K1 and K2 are equal. */ | |
5062 | ||
5063 | int | |
1cae46be | 5064 | case_compare (splay_tree_key k1, splay_tree_key k2) |
e41f0d80 | 5065 | { |
5066 | /* Consider a NULL key (such as arises with a `default' label) to be | |
5067 | smaller than anything else. */ | |
5068 | if (!k1) | |
5069 | return k2 ? -1 : 0; | |
5070 | else if (!k2) | |
5071 | return k1 ? 1 : 0; | |
5072 | ||
5073 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
5074 | } | |
5075 | ||
5076 | /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If | |
5077 | LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is | |
5078 | actually a `default' label. If only HIGH_VALUE is NULL_TREE, then | |
5079 | case label was declared using the usual C/C++ syntax, rather than | |
5080 | the GNU case range extension. CASES is a tree containing all the | |
5081 | case ranges processed so far; COND is the condition for the | |
eaae3b75 | 5082 | switch-statement itself. Returns the CASE_LABEL_EXPR created, or |
5083 | ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */ | |
e41f0d80 | 5084 | |
5085 | tree | |
2ca392fd | 5086 | c_add_case_label (splay_tree cases, tree cond, tree orig_type, |
5087 | tree low_value, tree high_value) | |
e41f0d80 | 5088 | { |
5089 | tree type; | |
5090 | tree label; | |
5091 | tree case_label; | |
5092 | splay_tree_node node; | |
5093 | ||
5094 | /* Create the LABEL_DECL itself. */ | |
4ee9c684 | 5095 | label = create_artificial_label (); |
e41f0d80 | 5096 | |
5097 | /* If there was an error processing the switch condition, bail now | |
5098 | before we get more confused. */ | |
5099 | if (!cond || cond == error_mark_node) | |
4ee9c684 | 5100 | goto error_out; |
e41f0d80 | 5101 | |
1cae46be | 5102 | if ((low_value && TREE_TYPE (low_value) |
5103 | && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
e41f0d80 | 5104 | || (high_value && TREE_TYPE (high_value) |
5105 | && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
b96dc121 | 5106 | { |
5107 | error ("pointers are not permitted as case values"); | |
5108 | goto error_out; | |
5109 | } | |
e41f0d80 | 5110 | |
5111 | /* Case ranges are a GNU extension. */ | |
8864917d | 5112 | if (high_value) |
21ca8540 | 5113 | pedwarn (input_location, OPT_pedantic, |
8864917d | 5114 | "range expressions in switch statements are non-standard"); |
e41f0d80 | 5115 | |
5116 | type = TREE_TYPE (cond); | |
5117 | if (low_value) | |
5118 | { | |
5119 | low_value = check_case_value (low_value); | |
5120 | low_value = convert_and_check (type, low_value); | |
96722196 | 5121 | if (low_value == error_mark_node) |
5122 | goto error_out; | |
e41f0d80 | 5123 | } |
5124 | if (high_value) | |
5125 | { | |
5126 | high_value = check_case_value (high_value); | |
5127 | high_value = convert_and_check (type, high_value); | |
96722196 | 5128 | if (high_value == error_mark_node) |
5129 | goto error_out; | |
e41f0d80 | 5130 | } |
5131 | ||
96722196 | 5132 | if (low_value && high_value) |
5133 | { | |
5134 | /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
a0c938f0 | 5135 | really a case range, even though it was written that way. |
5136 | Remove the HIGH_VALUE to simplify later processing. */ | |
96722196 | 5137 | if (tree_int_cst_equal (low_value, high_value)) |
5138 | high_value = NULL_TREE; | |
5139 | else if (!tree_int_cst_lt (low_value, high_value)) | |
5140 | warning (0, "empty range specified"); | |
5141 | } | |
e41f0d80 | 5142 | |
2ca392fd | 5143 | /* See if the case is in range of the type of the original testing |
5144 | expression. If both low_value and high_value are out of range, | |
5145 | don't insert the case label and return NULL_TREE. */ | |
5146 | if (low_value | |
84166705 | 5147 | && !check_case_bounds (type, orig_type, |
5148 | &low_value, high_value ? &high_value : NULL)) | |
2ca392fd | 5149 | return NULL_TREE; |
5150 | ||
e41f0d80 | 5151 | /* Look up the LOW_VALUE in the table of case labels we already |
5152 | have. */ | |
5153 | node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
5154 | /* If there was not an exact match, check for overlapping ranges. | |
5155 | There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
5156 | that's a `default' label and the only overlap is an exact match. */ | |
5157 | if (!node && (low_value || high_value)) | |
5158 | { | |
5159 | splay_tree_node low_bound; | |
5160 | splay_tree_node high_bound; | |
5161 | ||
5162 | /* Even though there wasn't an exact match, there might be an | |
5163 | overlap between this case range and another case range. | |
5164 | Since we've (inductively) not allowed any overlapping case | |
5165 | ranges, we simply need to find the greatest low case label | |
5166 | that is smaller that LOW_VALUE, and the smallest low case | |
5167 | label that is greater than LOW_VALUE. If there is an overlap | |
5168 | it will occur in one of these two ranges. */ | |
5169 | low_bound = splay_tree_predecessor (cases, | |
5170 | (splay_tree_key) low_value); | |
5171 | high_bound = splay_tree_successor (cases, | |
5172 | (splay_tree_key) low_value); | |
5173 | ||
5174 | /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
5175 | the LOW_VALUE, so there is no need to check unless the | |
5176 | LOW_BOUND is in fact itself a case range. */ | |
5177 | if (low_bound | |
5178 | && CASE_HIGH ((tree) low_bound->value) | |
5179 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
5180 | low_value) >= 0) | |
5181 | node = low_bound; | |
5182 | /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
5183 | range is bigger than the low end of the current range, so we | |
5184 | are only interested if the current range is a real range, and | |
5185 | not an ordinary case label. */ | |
1cae46be | 5186 | else if (high_bound |
e41f0d80 | 5187 | && high_value |
5188 | && (tree_int_cst_compare ((tree) high_bound->key, | |
5189 | high_value) | |
5190 | <= 0)) | |
5191 | node = high_bound; | |
5192 | } | |
5193 | /* If there was an overlap, issue an error. */ | |
5194 | if (node) | |
5195 | { | |
eaae3b75 | 5196 | tree duplicate = CASE_LABEL ((tree) node->value); |
e41f0d80 | 5197 | |
5198 | if (high_value) | |
5199 | { | |
5200 | error ("duplicate (or overlapping) case value"); | |
9bc3739f | 5201 | error ("%Jthis is the first entry overlapping that value", duplicate); |
e41f0d80 | 5202 | } |
5203 | else if (low_value) | |
5204 | { | |
5205 | error ("duplicate case value") ; | |
9bc3739f | 5206 | error ("%Jpreviously used here", duplicate); |
e41f0d80 | 5207 | } |
5208 | else | |
5209 | { | |
5210 | error ("multiple default labels in one switch"); | |
9bc3739f | 5211 | error ("%Jthis is the first default label", duplicate); |
e41f0d80 | 5212 | } |
4ee9c684 | 5213 | goto error_out; |
e41f0d80 | 5214 | } |
5215 | ||
5216 | /* Add a CASE_LABEL to the statement-tree. */ | |
5217 | case_label = add_stmt (build_case_label (low_value, high_value, label)); | |
5218 | /* Register this case label in the splay tree. */ | |
1cae46be | 5219 | splay_tree_insert (cases, |
e41f0d80 | 5220 | (splay_tree_key) low_value, |
5221 | (splay_tree_value) case_label); | |
5222 | ||
5223 | return case_label; | |
4ee9c684 | 5224 | |
5225 | error_out: | |
daf6dff5 | 5226 | /* Add a label so that the back-end doesn't think that the beginning of |
4ee9c684 | 5227 | the switch is unreachable. Note that we do not add a case label, as |
a53ff4c1 | 5228 | that just leads to duplicates and thence to failure later on. */ |
4ee9c684 | 5229 | if (!cases->root) |
5230 | { | |
5231 | tree t = create_artificial_label (); | |
daf6dff5 | 5232 | add_stmt (build_stmt (LABEL_EXPR, t)); |
4ee9c684 | 5233 | } |
5234 | return error_mark_node; | |
5235 | } | |
5236 | ||
5237 | /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
5238 | Used to verify that case values match up with enumerator values. */ | |
5239 | ||
5240 | static void | |
5241 | match_case_to_enum_1 (tree key, tree type, tree label) | |
5242 | { | |
5243 | char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
5244 | ||
5245 | /* ??? Not working too hard to print the double-word value. | |
5246 | Should perhaps be done with %lwd in the diagnostic routines? */ | |
5247 | if (TREE_INT_CST_HIGH (key) == 0) | |
5248 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
5249 | TREE_INT_CST_LOW (key)); | |
5250 | else if (!TYPE_UNSIGNED (type) | |
5251 | && TREE_INT_CST_HIGH (key) == -1 | |
5252 | && TREE_INT_CST_LOW (key) != 0) | |
5253 | snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
5254 | -TREE_INT_CST_LOW (key)); | |
5255 | else | |
5256 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
7df7561b | 5257 | (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (key), |
5258 | (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (key)); | |
4ee9c684 | 5259 | |
5260 | if (TYPE_NAME (type) == 0) | |
6cbbbc89 | 5261 | warning (warn_switch ? OPT_Wswitch : OPT_Wswitch_enum, |
5262 | "%Jcase value %qs not in enumerated type", | |
eaae3b75 | 5263 | CASE_LABEL (label), buf); |
4ee9c684 | 5264 | else |
6cbbbc89 | 5265 | warning (warn_switch ? OPT_Wswitch : OPT_Wswitch_enum, |
5266 | "%Jcase value %qs not in enumerated type %qT", | |
eaae3b75 | 5267 | CASE_LABEL (label), buf, type); |
4ee9c684 | 5268 | } |
5269 | ||
359d87c6 | 5270 | /* Subroutine of c_do_switch_warnings, called via splay_tree_foreach. |
5271 | Used to verify that case values match up with enumerator values. */ | |
5272 | ||
4ee9c684 | 5273 | static int |
5274 | match_case_to_enum (splay_tree_node node, void *data) | |
5275 | { | |
5276 | tree label = (tree) node->value; | |
4fd61bc6 | 5277 | tree type = (tree) data; |
4ee9c684 | 5278 | |
5279 | /* Skip default case. */ | |
5280 | if (!CASE_LOW (label)) | |
5281 | return 0; | |
5282 | ||
359d87c6 | 5283 | /* If CASE_LOW_SEEN is not set, that means CASE_LOW did not appear |
4ee9c684 | 5284 | when we did our enum->case scan. Reset our scratch bit after. */ |
359d87c6 | 5285 | if (!CASE_LOW_SEEN (label)) |
4ee9c684 | 5286 | match_case_to_enum_1 (CASE_LOW (label), type, label); |
5287 | else | |
359d87c6 | 5288 | CASE_LOW_SEEN (label) = 0; |
4ee9c684 | 5289 | |
359d87c6 | 5290 | /* If CASE_HIGH is non-null, we have a range. If CASE_HIGH_SEEN is |
5291 | not set, that means that CASE_HIGH did not appear when we did our | |
5292 | enum->case scan. Reset our scratch bit after. */ | |
4ee9c684 | 5293 | if (CASE_HIGH (label)) |
5294 | { | |
359d87c6 | 5295 | if (!CASE_HIGH_SEEN (label)) |
5296 | match_case_to_enum_1 (CASE_HIGH (label), type, label); | |
5297 | else | |
5298 | CASE_HIGH_SEEN (label) = 0; | |
4ee9c684 | 5299 | } |
5300 | ||
5301 | return 0; | |
5302 | } | |
5303 | ||
e7911019 | 5304 | /* Handle -Wswitch*. Called from the front end after parsing the |
5305 | switch construct. */ | |
5306 | /* ??? Should probably be somewhere generic, since other languages | |
5307 | besides C and C++ would want this. At the moment, however, C/C++ | |
5308 | are the only tree-ssa languages that support enumerations at all, | |
5309 | so the point is moot. */ | |
4ee9c684 | 5310 | |
e7911019 | 5311 | void |
5312 | c_do_switch_warnings (splay_tree cases, location_t switch_location, | |
5313 | tree type, tree cond) | |
4ee9c684 | 5314 | { |
b27ac6b5 | 5315 | splay_tree_node default_node; |
359d87c6 | 5316 | splay_tree_node node; |
5317 | tree chain; | |
6cbbbc89 | 5318 | int saved_warn_switch; |
4ee9c684 | 5319 | |
5320 | if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
5321 | return; | |
5322 | ||
4ee9c684 | 5323 | default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); |
8b6866af | 5324 | if (!default_node) |
5325 | warning (OPT_Wswitch_default, "%Hswitch missing default case", | |
5326 | &switch_location); | |
4ee9c684 | 5327 | |
359d87c6 | 5328 | /* From here on, we only care about about enumerated types. */ |
5329 | if (!type || TREE_CODE (type) != ENUMERAL_TYPE) | |
5330 | return; | |
5331 | ||
4ee9c684 | 5332 | /* If the switch expression was an enumerated type, check that |
5333 | exactly all enumeration literals are covered by the cases. | |
5334 | The check is made when -Wswitch was specified and there is no | |
5335 | default case, or when -Wswitch-enum was specified. */ | |
4ee9c684 | 5336 | |
359d87c6 | 5337 | if (!warn_switch_enum |
5338 | && !(warn_switch && !default_node)) | |
5339 | return; | |
5340 | ||
5341 | /* Clearing COND if it is not an integer constant simplifies | |
5342 | the tests inside the loop below. */ | |
5343 | if (TREE_CODE (cond) != INTEGER_CST) | |
5344 | cond = NULL_TREE; | |
5345 | ||
5346 | /* The time complexity here is O(N*lg(N)) worst case, but for the | |
5347 | common case of monotonically increasing enumerators, it is | |
5348 | O(N), since the nature of the splay tree will keep the next | |
5349 | element adjacent to the root at all times. */ | |
4ee9c684 | 5350 | |
359d87c6 | 5351 | for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) |
5352 | { | |
5353 | tree value = TREE_VALUE (chain); | |
3f00a6c0 | 5354 | if (TREE_CODE (value) == CONST_DECL) |
5355 | value = DECL_INITIAL (value); | |
359d87c6 | 5356 | node = splay_tree_lookup (cases, (splay_tree_key) value); |
5357 | if (node) | |
4ee9c684 | 5358 | { |
359d87c6 | 5359 | /* Mark the CASE_LOW part of the case entry as seen. */ |
5360 | tree label = (tree) node->value; | |
5361 | CASE_LOW_SEEN (label) = 1; | |
5362 | continue; | |
5363 | } | |
5364 | ||
5365 | /* Even though there wasn't an exact match, there might be a | |
f0b5f617 | 5366 | case range which includes the enumerator's value. */ |
359d87c6 | 5367 | node = splay_tree_predecessor (cases, (splay_tree_key) value); |
5368 | if (node && CASE_HIGH ((tree) node->value)) | |
5369 | { | |
5370 | tree label = (tree) node->value; | |
5371 | int cmp = tree_int_cst_compare (CASE_HIGH (label), value); | |
5372 | if (cmp >= 0) | |
4ee9c684 | 5373 | { |
359d87c6 | 5374 | /* If we match the upper bound exactly, mark the CASE_HIGH |
5375 | part of the case entry as seen. */ | |
5376 | if (cmp == 0) | |
5377 | CASE_HIGH_SEEN (label) = 1; | |
5378 | continue; | |
4ee9c684 | 5379 | } |
5380 | } | |
5381 | ||
359d87c6 | 5382 | /* We've now determined that this enumerated literal isn't |
5383 | handled by the case labels of the switch statement. */ | |
4ee9c684 | 5384 | |
359d87c6 | 5385 | /* If the switch expression is a constant, we only really care |
5386 | about whether that constant is handled by the switch. */ | |
5387 | if (cond && tree_int_cst_compare (cond, value)) | |
5388 | continue; | |
4ee9c684 | 5389 | |
6cbbbc89 | 5390 | /* If there is a default_node, the only relevant option is |
5391 | Wswitch-enum. Otherwise, if both are enabled then we prefer | |
5392 | to warn using -Wswitch because -Wswitch is enabled by -Wall | |
5393 | while -Wswitch-enum is explicit. */ | |
5394 | warning ((default_node || !warn_switch) | |
5395 | ? OPT_Wswitch_enum : OPT_Wswitch, | |
5396 | "%Henumeration value %qE not handled in switch", | |
359d87c6 | 5397 | &switch_location, TREE_PURPOSE (chain)); |
4ee9c684 | 5398 | } |
359d87c6 | 5399 | |
5400 | /* Warn if there are case expressions that don't correspond to | |
5401 | enumerators. This can occur since C and C++ don't enforce | |
5402 | type-checking of assignments to enumeration variables. | |
5403 | ||
5404 | The time complexity here is now always O(N) worst case, since | |
5405 | we should have marked both the lower bound and upper bound of | |
5406 | every disjoint case label, with CASE_LOW_SEEN and CASE_HIGH_SEEN | |
5407 | above. This scan also resets those fields. */ | |
6cbbbc89 | 5408 | |
5409 | /* If there is a default_node, the only relevant option is | |
5410 | Wswitch-enum. Otherwise, if both are enabled then we prefer | |
5411 | to warn using -Wswitch because -Wswitch is enabled by -Wall | |
5412 | while -Wswitch-enum is explicit. */ | |
5413 | saved_warn_switch = warn_switch; | |
5414 | if (default_node) | |
5415 | warn_switch = 0; | |
359d87c6 | 5416 | splay_tree_foreach (cases, match_case_to_enum, type); |
6cbbbc89 | 5417 | warn_switch = saved_warn_switch; |
5418 | ||
e41f0d80 | 5419 | } |
5420 | ||
9dd48740 | 5421 | /* Finish an expression taking the address of LABEL (an |
dda49785 | 5422 | IDENTIFIER_NODE). Returns an expression for the address. |
5423 | ||
5424 | LOC is the location for the expression returned. */ | |
d0a47c8d | 5425 | |
1cae46be | 5426 | tree |
dda49785 | 5427 | finish_label_address_expr (tree label, location_t loc) |
d0a47c8d | 5428 | { |
5429 | tree result; | |
5430 | ||
21ca8540 | 5431 | pedwarn (input_location, OPT_pedantic, "taking the address of a label is non-standard"); |
d0a47c8d | 5432 | |
9dd48740 | 5433 | if (label == error_mark_node) |
5434 | return error_mark_node; | |
5435 | ||
d0a47c8d | 5436 | label = lookup_label (label); |
5437 | if (label == NULL_TREE) | |
5438 | result = null_pointer_node; | |
5439 | else | |
5440 | { | |
5441 | TREE_USED (label) = 1; | |
5442 | result = build1 (ADDR_EXPR, ptr_type_node, label); | |
d0a47c8d | 5443 | /* The current function in not necessarily uninlinable. |
5444 | Computed gotos are incompatible with inlining, but the value | |
5445 | here could be used only in a diagnostic, for example. */ | |
dda49785 | 5446 | protected_set_expr_location (result, loc); |
d0a47c8d | 5447 | } |
5448 | ||
5449 | return result; | |
5450 | } | |
4f9a1c9b | 5451 | \f |
5452 | ||
5453 | /* Given a boolean expression ARG, return a tree representing an increment | |
5454 | or decrement (as indicated by CODE) of ARG. The front end must check for | |
5455 | invalid cases (e.g., decrement in C++). */ | |
5456 | tree | |
1cae46be | 5457 | boolean_increment (enum tree_code code, tree arg) |
4f9a1c9b | 5458 | { |
5459 | tree val; | |
69db191c | 5460 | tree true_res = build_int_cst (TREE_TYPE (arg), 1); |
c0f19401 | 5461 | |
4f9a1c9b | 5462 | arg = stabilize_reference (arg); |
5463 | switch (code) | |
5464 | { | |
5465 | case PREINCREMENT_EXPR: | |
14ae0310 | 5466 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
4f9a1c9b | 5467 | break; |
5468 | case POSTINCREMENT_EXPR: | |
14ae0310 | 5469 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
4f9a1c9b | 5470 | arg = save_expr (arg); |
14ae0310 | 5471 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
5472 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4f9a1c9b | 5473 | break; |
5474 | case PREDECREMENT_EXPR: | |
14ae0310 | 5475 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
5476 | invert_truthvalue (arg)); | |
4f9a1c9b | 5477 | break; |
5478 | case POSTDECREMENT_EXPR: | |
14ae0310 | 5479 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
5480 | invert_truthvalue (arg)); | |
4f9a1c9b | 5481 | arg = save_expr (arg); |
14ae0310 | 5482 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
5483 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4f9a1c9b | 5484 | break; |
5485 | default: | |
231bd014 | 5486 | gcc_unreachable (); |
4f9a1c9b | 5487 | } |
5488 | TREE_SIDE_EFFECTS (val) = 1; | |
5489 | return val; | |
5490 | } | |
76a6e674 | 5491 | \f |
fd6f6435 | 5492 | /* Built-in macros for stddef.h, that require macros defined in this |
5493 | file. */ | |
79cf3ec1 | 5494 | void |
1cae46be | 5495 | c_stddef_cpp_builtins(void) |
1ed9d5f5 | 5496 | { |
63994318 | 5497 | builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); |
5498 | builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
5499 | builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
5500 | builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
36bccbfc | 5501 | builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0); |
5502 | builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0); | |
b0726616 | 5503 | builtin_define_with_value ("__CHAR16_TYPE__", CHAR16_TYPE, 0); |
5504 | builtin_define_with_value ("__CHAR32_TYPE__", CHAR32_TYPE, 0); | |
574006c3 | 5505 | } |
5506 | ||
7d3b509a | 5507 | static void |
1cae46be | 5508 | c_init_attributes (void) |
7d3b509a | 5509 | { |
5510 | /* Fill in the built_in_attributes array. */ | |
7c446c95 | 5511 | #define DEF_ATTR_NULL_TREE(ENUM) \ |
7d3b509a | 5512 | built_in_attributes[(int) ENUM] = NULL_TREE; |
7c446c95 | 5513 | #define DEF_ATTR_INT(ENUM, VALUE) \ |
7016c612 | 5514 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); |
7d3b509a | 5515 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
5516 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5517 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5518 | built_in_attributes[(int) ENUM] \ | |
5519 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5520 | built_in_attributes[(int) VALUE], \ | |
5521 | built_in_attributes[(int) CHAIN]); | |
7d3b509a | 5522 | #include "builtin-attrs.def" |
5523 | #undef DEF_ATTR_NULL_TREE | |
5524 | #undef DEF_ATTR_INT | |
5525 | #undef DEF_ATTR_IDENT | |
5526 | #undef DEF_ATTR_TREE_LIST | |
76a6e674 | 5527 | } |
5f3cead1 | 5528 | |
f8e93a2e | 5529 | /* Attribute handlers common to C front ends. */ |
5530 | ||
5531 | /* Handle a "packed" attribute; arguments as in | |
5532 | struct attribute_spec.handler. */ | |
5533 | ||
5534 | static tree | |
9a03a746 | 5535 | handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
09347743 | 5536 | int flags, bool *no_add_attrs) |
f8e93a2e | 5537 | { |
f40175cb | 5538 | if (TYPE_P (*node)) |
f8e93a2e | 5539 | { |
5540 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 5541 | *node = build_variant_type_copy (*node); |
f40175cb | 5542 | TYPE_PACKED (*node) = 1; |
f8e93a2e | 5543 | } |
5544 | else if (TREE_CODE (*node) == FIELD_DECL) | |
c2ab04f9 | 5545 | { |
9fd767c5 | 5546 | if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT |
5547 | /* Still pack bitfields. */ | |
5548 | && ! DECL_INITIAL (*node)) | |
c2ab04f9 | 5549 | warning (OPT_Wattributes, |
5550 | "%qE attribute ignored for field of type %qT", | |
5551 | name, TREE_TYPE (*node)); | |
5552 | else | |
5553 | DECL_PACKED (*node) = 1; | |
5554 | } | |
f8e93a2e | 5555 | /* We can't set DECL_PACKED for a VAR_DECL, because the bit is |
f40175cb | 5556 | used for DECL_REGISTER. It wouldn't mean anything anyway. |
5557 | We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
5558 | that changes what the typedef is typing. */ | |
f8e93a2e | 5559 | else |
5560 | { | |
9b2d6d13 | 5561 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5562 | *no_add_attrs = true; |
5563 | } | |
5564 | ||
5565 | return NULL_TREE; | |
5566 | } | |
5567 | ||
5568 | /* Handle a "nocommon" attribute; arguments as in | |
5569 | struct attribute_spec.handler. */ | |
5570 | ||
5571 | static tree | |
1cae46be | 5572 | handle_nocommon_attribute (tree *node, tree name, |
9a03a746 | 5573 | tree ARG_UNUSED (args), |
5574 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5575 | { |
5576 | if (TREE_CODE (*node) == VAR_DECL) | |
5577 | DECL_COMMON (*node) = 0; | |
5578 | else | |
5579 | { | |
9b2d6d13 | 5580 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5581 | *no_add_attrs = true; |
5582 | } | |
5583 | ||
5584 | return NULL_TREE; | |
5585 | } | |
5586 | ||
5587 | /* Handle a "common" attribute; arguments as in | |
5588 | struct attribute_spec.handler. */ | |
5589 | ||
5590 | static tree | |
9a03a746 | 5591 | handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5592 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5593 | { |
5594 | if (TREE_CODE (*node) == VAR_DECL) | |
5595 | DECL_COMMON (*node) = 1; | |
5596 | else | |
5597 | { | |
9b2d6d13 | 5598 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5599 | *no_add_attrs = true; |
5600 | } | |
5601 | ||
5602 | return NULL_TREE; | |
5603 | } | |
5604 | ||
5605 | /* Handle a "noreturn" attribute; arguments as in | |
5606 | struct attribute_spec.handler. */ | |
5607 | ||
5608 | static tree | |
9a03a746 | 5609 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5610 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5611 | { |
5612 | tree type = TREE_TYPE (*node); | |
5613 | ||
5614 | /* See FIXME comment in c_common_attribute_table. */ | |
5615 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5616 | TREE_THIS_VOLATILE (*node) = 1; | |
5617 | else if (TREE_CODE (type) == POINTER_TYPE | |
5618 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
5619 | TREE_TYPE (*node) | |
5620 | = build_pointer_type | |
5621 | (build_type_variant (TREE_TYPE (type), | |
71bda45d | 5622 | TYPE_READONLY (TREE_TYPE (type)), 1)); |
f8e93a2e | 5623 | else |
5624 | { | |
9b2d6d13 | 5625 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5626 | *no_add_attrs = true; |
5627 | } | |
5628 | ||
5629 | return NULL_TREE; | |
5630 | } | |
5631 | ||
5de92639 | 5632 | /* Handle a "hot" and attribute; arguments as in |
5633 | struct attribute_spec.handler. */ | |
5634 | ||
5635 | static tree | |
5636 | handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
46f8e3b0 | 5637 | int ARG_UNUSED (flags), bool *no_add_attrs) |
5de92639 | 5638 | { |
5639 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5640 | { | |
5641 | if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL) | |
5642 | { | |
5643 | warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s", | |
5644 | name, "cold"); | |
5645 | *no_add_attrs = true; | |
5646 | } | |
24470055 | 5647 | /* Most of the rest of the hot processing is done later with |
5648 | lookup_attribute. */ | |
5de92639 | 5649 | } |
5650 | else | |
5651 | { | |
5652 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5653 | *no_add_attrs = true; | |
5654 | } | |
5655 | ||
5656 | return NULL_TREE; | |
5657 | } | |
5658 | /* Handle a "cold" and attribute; arguments as in | |
5659 | struct attribute_spec.handler. */ | |
5660 | ||
5661 | static tree | |
5662 | handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5663 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5664 | { | |
5665 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5666 | { | |
5667 | if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL) | |
5668 | { | |
5669 | warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s", | |
5670 | name, "hot"); | |
5671 | *no_add_attrs = true; | |
5672 | } | |
24470055 | 5673 | /* Most of the rest of the cold processing is done later with |
5674 | lookup_attribute. */ | |
5de92639 | 5675 | } |
5676 | else | |
5677 | { | |
5678 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5679 | *no_add_attrs = true; | |
5680 | } | |
5681 | ||
5682 | return NULL_TREE; | |
5683 | } | |
5684 | ||
f8e93a2e | 5685 | /* Handle a "noinline" attribute; arguments as in |
5686 | struct attribute_spec.handler. */ | |
5687 | ||
5688 | static tree | |
1cae46be | 5689 | handle_noinline_attribute (tree *node, tree name, |
9a03a746 | 5690 | tree ARG_UNUSED (args), |
5691 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5692 | { |
5693 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5694 | DECL_UNINLINABLE (*node) = 1; | |
5695 | else | |
5696 | { | |
9b2d6d13 | 5697 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5698 | *no_add_attrs = true; |
5699 | } | |
5700 | ||
5701 | return NULL_TREE; | |
5702 | } | |
5703 | ||
5704 | /* Handle a "always_inline" attribute; arguments as in | |
5705 | struct attribute_spec.handler. */ | |
5706 | ||
5707 | static tree | |
1cae46be | 5708 | handle_always_inline_attribute (tree *node, tree name, |
9a03a746 | 5709 | tree ARG_UNUSED (args), |
5710 | int ARG_UNUSED (flags), | |
09347743 | 5711 | bool *no_add_attrs) |
f8e93a2e | 5712 | { |
5713 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5714 | { | |
ebb7d626 | 5715 | /* Set the attribute and mark it for disregarding inline |
5716 | limits. */ | |
5717 | DECL_DISREGARD_INLINE_LIMITS (*node) = 1; | |
f8e93a2e | 5718 | } |
5719 | else | |
5720 | { | |
9b2d6d13 | 5721 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5722 | *no_add_attrs = true; |
541e4101 | 5723 | } |
5724 | ||
5725 | return NULL_TREE; | |
5726 | } | |
5727 | ||
5728 | /* Handle a "gnu_inline" attribute; arguments as in | |
5729 | struct attribute_spec.handler. */ | |
5730 | ||
5731 | static tree | |
5732 | handle_gnu_inline_attribute (tree *node, tree name, | |
5733 | tree ARG_UNUSED (args), | |
5734 | int ARG_UNUSED (flags), | |
5735 | bool *no_add_attrs) | |
5736 | { | |
5737 | if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) | |
5738 | { | |
5739 | /* Do nothing else, just set the attribute. We'll get at | |
5740 | it later with lookup_attribute. */ | |
5741 | } | |
5742 | else | |
5743 | { | |
5744 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5745 | *no_add_attrs = true; | |
f8e93a2e | 5746 | } |
5747 | ||
5748 | return NULL_TREE; | |
5749 | } | |
5750 | ||
1b16fc45 | 5751 | /* Handle an "artificial" attribute; arguments as in |
5752 | struct attribute_spec.handler. */ | |
5753 | ||
5754 | static tree | |
5755 | handle_artificial_attribute (tree *node, tree name, | |
5756 | tree ARG_UNUSED (args), | |
5757 | int ARG_UNUSED (flags), | |
5758 | bool *no_add_attrs) | |
5759 | { | |
5760 | if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) | |
5761 | { | |
5762 | /* Do nothing else, just set the attribute. We'll get at | |
5763 | it later with lookup_attribute. */ | |
5764 | } | |
5765 | else | |
5766 | { | |
5767 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5768 | *no_add_attrs = true; | |
5769 | } | |
5770 | ||
5771 | return NULL_TREE; | |
5772 | } | |
5773 | ||
0cdd9887 | 5774 | /* Handle a "flatten" attribute; arguments as in |
5775 | struct attribute_spec.handler. */ | |
5776 | ||
5777 | static tree | |
5778 | handle_flatten_attribute (tree *node, tree name, | |
a0c938f0 | 5779 | tree args ATTRIBUTE_UNUSED, |
5780 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) | |
0cdd9887 | 5781 | { |
5782 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5783 | /* Do nothing else, just set the attribute. We'll get at | |
5784 | it later with lookup_attribute. */ | |
5785 | ; | |
5786 | else | |
5787 | { | |
5788 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5789 | *no_add_attrs = true; | |
5790 | } | |
5791 | ||
5792 | return NULL_TREE; | |
5793 | } | |
5794 | ||
10fc867f | 5795 | /* Handle a "warning" or "error" attribute; arguments as in |
5796 | struct attribute_spec.handler. */ | |
5797 | ||
5798 | static tree | |
5799 | handle_error_attribute (tree *node, tree name, tree args, | |
5800 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5801 | { | |
5802 | if (TREE_CODE (*node) == FUNCTION_DECL | |
5803 | || TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
5804 | /* Do nothing else, just set the attribute. We'll get at | |
5805 | it later with lookup_attribute. */ | |
5806 | ; | |
5807 | else | |
5808 | { | |
5809 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5810 | *no_add_attrs = true; | |
5811 | } | |
5812 | ||
5813 | return NULL_TREE; | |
5814 | } | |
0cdd9887 | 5815 | |
f8e93a2e | 5816 | /* Handle a "used" attribute; arguments as in |
5817 | struct attribute_spec.handler. */ | |
5818 | ||
5819 | static tree | |
9a03a746 | 5820 | handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), |
5821 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5822 | { |
d0a31bd8 | 5823 | tree node = *pnode; |
5824 | ||
5825 | if (TREE_CODE (node) == FUNCTION_DECL | |
5826 | || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
f54ed8bc | 5827 | { |
f54ed8bc | 5828 | TREE_USED (node) = 1; |
9423c9b7 | 5829 | DECL_PRESERVE_P (node) = 1; |
f54ed8bc | 5830 | } |
f8e93a2e | 5831 | else |
5832 | { | |
9b2d6d13 | 5833 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5834 | *no_add_attrs = true; |
5835 | } | |
5836 | ||
5837 | return NULL_TREE; | |
5838 | } | |
5839 | ||
5840 | /* Handle a "unused" attribute; arguments as in | |
5841 | struct attribute_spec.handler. */ | |
5842 | ||
5843 | static tree | |
9a03a746 | 5844 | handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5845 | int flags, bool *no_add_attrs) | |
f8e93a2e | 5846 | { |
5847 | if (DECL_P (*node)) | |
5848 | { | |
5849 | tree decl = *node; | |
5850 | ||
5851 | if (TREE_CODE (decl) == PARM_DECL | |
5852 | || TREE_CODE (decl) == VAR_DECL | |
5853 | || TREE_CODE (decl) == FUNCTION_DECL | |
5854 | || TREE_CODE (decl) == LABEL_DECL | |
5855 | || TREE_CODE (decl) == TYPE_DECL) | |
5856 | TREE_USED (decl) = 1; | |
5857 | else | |
5858 | { | |
9b2d6d13 | 5859 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5860 | *no_add_attrs = true; |
5861 | } | |
5862 | } | |
5863 | else | |
5864 | { | |
5865 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 5866 | *node = build_variant_type_copy (*node); |
f8e93a2e | 5867 | TREE_USED (*node) = 1; |
5868 | } | |
5869 | ||
5870 | return NULL_TREE; | |
5871 | } | |
5872 | ||
62eec3b4 | 5873 | /* Handle a "externally_visible" attribute; arguments as in |
5874 | struct attribute_spec.handler. */ | |
5875 | ||
5876 | static tree | |
5877 | handle_externally_visible_attribute (tree *pnode, tree name, | |
5878 | tree ARG_UNUSED (args), | |
5879 | int ARG_UNUSED (flags), | |
5880 | bool *no_add_attrs) | |
5881 | { | |
5882 | tree node = *pnode; | |
5883 | ||
ba12ea31 | 5884 | if (TREE_CODE (node) == FUNCTION_DECL || TREE_CODE (node) == VAR_DECL) |
62eec3b4 | 5885 | { |
ba12ea31 | 5886 | if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL |
5887 | && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node)) | |
5888 | { | |
5889 | warning (OPT_Wattributes, | |
5890 | "%qE attribute have effect only on public objects", name); | |
5891 | *no_add_attrs = true; | |
5892 | } | |
62eec3b4 | 5893 | } |
62eec3b4 | 5894 | else |
5895 | { | |
5896 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5897 | *no_add_attrs = true; | |
5898 | } | |
5899 | ||
5900 | return NULL_TREE; | |
5901 | } | |
5902 | ||
f8e93a2e | 5903 | /* Handle a "const" attribute; arguments as in |
5904 | struct attribute_spec.handler. */ | |
5905 | ||
5906 | static tree | |
9a03a746 | 5907 | handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5908 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5909 | { |
5910 | tree type = TREE_TYPE (*node); | |
5911 | ||
5912 | /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
5913 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5914 | TREE_READONLY (*node) = 1; | |
5915 | else if (TREE_CODE (type) == POINTER_TYPE | |
5916 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
5917 | TREE_TYPE (*node) | |
5918 | = build_pointer_type | |
5919 | (build_type_variant (TREE_TYPE (type), 1, | |
5920 | TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
5921 | else | |
5922 | { | |
9b2d6d13 | 5923 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5924 | *no_add_attrs = true; |
5925 | } | |
5926 | ||
5927 | return NULL_TREE; | |
5928 | } | |
5929 | ||
5930 | /* Handle a "transparent_union" attribute; arguments as in | |
5931 | struct attribute_spec.handler. */ | |
5932 | ||
5933 | static tree | |
1cae46be | 5934 | handle_transparent_union_attribute (tree *node, tree name, |
9a03a746 | 5935 | tree ARG_UNUSED (args), int flags, |
09347743 | 5936 | bool *no_add_attrs) |
f8e93a2e | 5937 | { |
881eb642 | 5938 | tree type; |
03908818 | 5939 | |
5940 | *no_add_attrs = true; | |
f8e93a2e | 5941 | |
881eb642 | 5942 | if (TREE_CODE (*node) == TYPE_DECL) |
5943 | node = &TREE_TYPE (*node); | |
5944 | type = *node; | |
f8e93a2e | 5945 | |
03908818 | 5946 | if (TREE_CODE (type) == UNION_TYPE) |
f8e93a2e | 5947 | { |
03908818 | 5948 | /* When IN_PLACE is set, leave the check for FIELDS and MODE to |
5949 | the code in finish_struct. */ | |
f8e93a2e | 5950 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) |
03908818 | 5951 | { |
5952 | if (TYPE_FIELDS (type) == NULL_TREE | |
5953 | || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type))) | |
5954 | goto ignored; | |
5955 | ||
5956 | /* A type variant isn't good enough, since we don't a cast | |
5957 | to such a type removed as a no-op. */ | |
5958 | *node = type = build_duplicate_type (type); | |
5959 | } | |
5960 | ||
5961 | TYPE_TRANSPARENT_UNION (type) = 1; | |
5962 | return NULL_TREE; | |
f8e93a2e | 5963 | } |
5964 | ||
03908818 | 5965 | ignored: |
5966 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
f8e93a2e | 5967 | return NULL_TREE; |
5968 | } | |
5969 | ||
9af7fd5b | 5970 | /* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to |
5971 | get the requested priority for a constructor or destructor, | |
5972 | possibly issuing diagnostics for invalid or reserved | |
5973 | priorities. */ | |
5974 | ||
5975 | static priority_type | |
5976 | get_priority (tree args, bool is_destructor) | |
5977 | { | |
5978 | HOST_WIDE_INT pri; | |
6c181a06 | 5979 | tree arg; |
9af7fd5b | 5980 | |
5981 | if (!args) | |
5982 | return DEFAULT_INIT_PRIORITY; | |
6c181a06 | 5983 | |
28fbc04f | 5984 | if (!SUPPORTS_INIT_PRIORITY) |
5985 | { | |
5986 | if (is_destructor) | |
5987 | error ("destructor priorities are not supported"); | |
5988 | else | |
5989 | error ("constructor priorities are not supported"); | |
5990 | return DEFAULT_INIT_PRIORITY; | |
5991 | } | |
5992 | ||
6c181a06 | 5993 | arg = TREE_VALUE (args); |
5994 | if (!host_integerp (arg, /*pos=*/0) | |
5995 | || !INTEGRAL_TYPE_P (TREE_TYPE (arg))) | |
9af7fd5b | 5996 | goto invalid; |
5997 | ||
5998 | pri = tree_low_cst (TREE_VALUE (args), /*pos=*/0); | |
5999 | if (pri < 0 || pri > MAX_INIT_PRIORITY) | |
6000 | goto invalid; | |
6001 | ||
6002 | if (pri <= MAX_RESERVED_INIT_PRIORITY) | |
6003 | { | |
6004 | if (is_destructor) | |
6005 | warning (0, | |
6006 | "destructor priorities from 0 to %d are reserved " | |
6007 | "for the implementation", | |
6008 | MAX_RESERVED_INIT_PRIORITY); | |
6009 | else | |
6010 | warning (0, | |
6011 | "constructor priorities from 0 to %d are reserved " | |
6012 | "for the implementation", | |
6013 | MAX_RESERVED_INIT_PRIORITY); | |
6014 | } | |
6015 | return pri; | |
6016 | ||
6017 | invalid: | |
6018 | if (is_destructor) | |
6019 | error ("destructor priorities must be integers from 0 to %d inclusive", | |
6020 | MAX_INIT_PRIORITY); | |
6021 | else | |
6022 | error ("constructor priorities must be integers from 0 to %d inclusive", | |
6023 | MAX_INIT_PRIORITY); | |
6024 | return DEFAULT_INIT_PRIORITY; | |
6025 | } | |
6026 | ||
f8e93a2e | 6027 | /* Handle a "constructor" attribute; arguments as in |
6028 | struct attribute_spec.handler. */ | |
6029 | ||
6030 | static tree | |
9af7fd5b | 6031 | handle_constructor_attribute (tree *node, tree name, tree args, |
9a03a746 | 6032 | int ARG_UNUSED (flags), |
09347743 | 6033 | bool *no_add_attrs) |
f8e93a2e | 6034 | { |
6035 | tree decl = *node; | |
6036 | tree type = TREE_TYPE (decl); | |
6037 | ||
6038 | if (TREE_CODE (decl) == FUNCTION_DECL | |
6039 | && TREE_CODE (type) == FUNCTION_TYPE | |
6040 | && decl_function_context (decl) == 0) | |
6041 | { | |
9af7fd5b | 6042 | priority_type priority; |
f8e93a2e | 6043 | DECL_STATIC_CONSTRUCTOR (decl) = 1; |
9af7fd5b | 6044 | priority = get_priority (args, /*is_destructor=*/false); |
6045 | SET_DECL_INIT_PRIORITY (decl, priority); | |
f8e93a2e | 6046 | TREE_USED (decl) = 1; |
6047 | } | |
6048 | else | |
6049 | { | |
9b2d6d13 | 6050 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6051 | *no_add_attrs = true; |
6052 | } | |
6053 | ||
6054 | return NULL_TREE; | |
6055 | } | |
6056 | ||
6057 | /* Handle a "destructor" attribute; arguments as in | |
6058 | struct attribute_spec.handler. */ | |
6059 | ||
6060 | static tree | |
9af7fd5b | 6061 | handle_destructor_attribute (tree *node, tree name, tree args, |
9a03a746 | 6062 | int ARG_UNUSED (flags), |
09347743 | 6063 | bool *no_add_attrs) |
f8e93a2e | 6064 | { |
6065 | tree decl = *node; | |
6066 | tree type = TREE_TYPE (decl); | |
6067 | ||
6068 | if (TREE_CODE (decl) == FUNCTION_DECL | |
6069 | && TREE_CODE (type) == FUNCTION_TYPE | |
6070 | && decl_function_context (decl) == 0) | |
6071 | { | |
9af7fd5b | 6072 | priority_type priority; |
f8e93a2e | 6073 | DECL_STATIC_DESTRUCTOR (decl) = 1; |
9af7fd5b | 6074 | priority = get_priority (args, /*is_destructor=*/true); |
6075 | SET_DECL_FINI_PRIORITY (decl, priority); | |
f8e93a2e | 6076 | TREE_USED (decl) = 1; |
6077 | } | |
6078 | else | |
6079 | { | |
9b2d6d13 | 6080 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6081 | *no_add_attrs = true; |
6082 | } | |
6083 | ||
6084 | return NULL_TREE; | |
6085 | } | |
6086 | ||
6087 | /* Handle a "mode" attribute; arguments as in | |
6088 | struct attribute_spec.handler. */ | |
6089 | ||
6090 | static tree | |
9a03a746 | 6091 | handle_mode_attribute (tree *node, tree name, tree args, |
6092 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 6093 | { |
6094 | tree type = *node; | |
6095 | ||
6096 | *no_add_attrs = true; | |
6097 | ||
6098 | if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) | |
9b2d6d13 | 6099 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6100 | else |
6101 | { | |
6102 | int j; | |
6103 | const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); | |
6104 | int len = strlen (p); | |
6105 | enum machine_mode mode = VOIDmode; | |
6106 | tree typefm; | |
b2aef146 | 6107 | bool valid_mode; |
f8e93a2e | 6108 | |
6109 | if (len > 4 && p[0] == '_' && p[1] == '_' | |
6110 | && p[len - 1] == '_' && p[len - 2] == '_') | |
6111 | { | |
4fd61bc6 | 6112 | char *newp = (char *) alloca (len - 1); |
f8e93a2e | 6113 | |
6114 | strcpy (newp, &p[2]); | |
6115 | newp[len - 4] = '\0'; | |
6116 | p = newp; | |
6117 | } | |
6118 | ||
6119 | /* Change this type to have a type with the specified mode. | |
6120 | First check for the special modes. */ | |
84166705 | 6121 | if (!strcmp (p, "byte")) |
f8e93a2e | 6122 | mode = byte_mode; |
6123 | else if (!strcmp (p, "word")) | |
6124 | mode = word_mode; | |
84166705 | 6125 | else if (!strcmp (p, "pointer")) |
f8e93a2e | 6126 | mode = ptr_mode; |
0ef89dfd | 6127 | else if (!strcmp (p, "libgcc_cmp_return")) |
6128 | mode = targetm.libgcc_cmp_return_mode (); | |
6129 | else if (!strcmp (p, "libgcc_shift_count")) | |
6130 | mode = targetm.libgcc_shift_count_mode (); | |
1bd43494 | 6131 | else if (!strcmp (p, "unwind_word")) |
6132 | mode = targetm.unwind_word_mode (); | |
f8e93a2e | 6133 | else |
6134 | for (j = 0; j < NUM_MACHINE_MODES; j++) | |
6135 | if (!strcmp (p, GET_MODE_NAME (j))) | |
743a6f47 | 6136 | { |
6137 | mode = (enum machine_mode) j; | |
6138 | break; | |
6139 | } | |
f8e93a2e | 6140 | |
6141 | if (mode == VOIDmode) | |
4917c376 | 6142 | { |
1e5fcbe2 | 6143 | error ("unknown machine mode %qs", p); |
4917c376 | 6144 | return NULL_TREE; |
6145 | } | |
6146 | ||
b2aef146 | 6147 | valid_mode = false; |
6148 | switch (GET_MODE_CLASS (mode)) | |
4917c376 | 6149 | { |
b2aef146 | 6150 | case MODE_INT: |
6151 | case MODE_PARTIAL_INT: | |
6152 | case MODE_FLOAT: | |
c4503c0a | 6153 | case MODE_DECIMAL_FLOAT: |
9421ebb9 | 6154 | case MODE_FRACT: |
6155 | case MODE_UFRACT: | |
6156 | case MODE_ACCUM: | |
6157 | case MODE_UACCUM: | |
b2aef146 | 6158 | valid_mode = targetm.scalar_mode_supported_p (mode); |
6159 | break; | |
6160 | ||
6161 | case MODE_COMPLEX_INT: | |
6162 | case MODE_COMPLEX_FLOAT: | |
6163 | valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); | |
6164 | break; | |
6165 | ||
6166 | case MODE_VECTOR_INT: | |
6167 | case MODE_VECTOR_FLOAT: | |
9421ebb9 | 6168 | case MODE_VECTOR_FRACT: |
6169 | case MODE_VECTOR_UFRACT: | |
6170 | case MODE_VECTOR_ACCUM: | |
6171 | case MODE_VECTOR_UACCUM: | |
9b2d6d13 | 6172 | warning (OPT_Wattributes, "specifying vector types with " |
6173 | "__attribute__ ((mode)) is deprecated"); | |
6174 | warning (OPT_Wattributes, | |
6175 | "use __attribute__ ((vector_size)) instead"); | |
b2aef146 | 6176 | valid_mode = vector_mode_valid_p (mode); |
6177 | break; | |
4917c376 | 6178 | |
b2aef146 | 6179 | default: |
6180 | break; | |
6181 | } | |
6182 | if (!valid_mode) | |
6183 | { | |
1e5fcbe2 | 6184 | error ("unable to emulate %qs", p); |
b2aef146 | 6185 | return NULL_TREE; |
6186 | } | |
4917c376 | 6187 | |
b2aef146 | 6188 | if (POINTER_TYPE_P (type)) |
ead34f59 | 6189 | { |
b2aef146 | 6190 | tree (*fn)(tree, enum machine_mode, bool); |
6191 | ||
6192 | if (!targetm.valid_pointer_mode (mode)) | |
ead34f59 | 6193 | { |
1e5fcbe2 | 6194 | error ("invalid pointer mode %qs", p); |
ead34f59 | 6195 | return NULL_TREE; |
6196 | } | |
6197 | ||
a0c938f0 | 6198 | if (TREE_CODE (type) == POINTER_TYPE) |
b2aef146 | 6199 | fn = build_pointer_type_for_mode; |
805e22b2 | 6200 | else |
b2aef146 | 6201 | fn = build_reference_type_for_mode; |
6202 | typefm = fn (TREE_TYPE (type), mode, false); | |
ead34f59 | 6203 | } |
b2aef146 | 6204 | else |
9421ebb9 | 6205 | { |
6206 | /* For fixed-point modes, we need to test if the signness of type | |
6207 | and the machine mode are consistent. */ | |
6208 | if (ALL_FIXED_POINT_MODE_P (mode) | |
6209 | && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode)) | |
6210 | { | |
6211 | error ("signness of type and machine mode %qs don't match", p); | |
6212 | return NULL_TREE; | |
6213 | } | |
6214 | /* For fixed-point modes, we need to pass saturating info. */ | |
6215 | typefm = lang_hooks.types.type_for_mode (mode, | |
6216 | ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type) | |
6217 | : TYPE_UNSIGNED (type)); | |
6218 | } | |
3a648ab9 | 6219 | |
b2aef146 | 6220 | if (typefm == NULL_TREE) |
6221 | { | |
743a6f47 | 6222 | error ("no data type for mode %qs", p); |
b2aef146 | 6223 | return NULL_TREE; |
6224 | } | |
3a648ab9 | 6225 | else if (TREE_CODE (type) == ENUMERAL_TYPE) |
6226 | { | |
6227 | /* For enumeral types, copy the precision from the integer | |
6228 | type returned above. If not an INTEGER_TYPE, we can't use | |
6229 | this mode for this type. */ | |
6230 | if (TREE_CODE (typefm) != INTEGER_TYPE) | |
6231 | { | |
743a6f47 | 6232 | error ("cannot use mode %qs for enumeral types", p); |
3a648ab9 | 6233 | return NULL_TREE; |
6234 | } | |
6235 | ||
10080eac | 6236 | if (flags & ATTR_FLAG_TYPE_IN_PLACE) |
6237 | { | |
6238 | TYPE_PRECISION (type) = TYPE_PRECISION (typefm); | |
6239 | typefm = type; | |
6240 | } | |
6241 | else | |
6242 | { | |
6243 | /* We cannot build a type variant, as there's code that assumes | |
6244 | that TYPE_MAIN_VARIANT has the same mode. This includes the | |
6245 | debug generators. Instead, create a subrange type. This | |
6246 | results in all of the enumeral values being emitted only once | |
6247 | in the original, and the subtype gets them by reference. */ | |
6248 | if (TYPE_UNSIGNED (type)) | |
6249 | typefm = make_unsigned_type (TYPE_PRECISION (typefm)); | |
6250 | else | |
6251 | typefm = make_signed_type (TYPE_PRECISION (typefm)); | |
6252 | TREE_TYPE (typefm) = type; | |
6253 | } | |
3a648ab9 | 6254 | } |
4bf450a1 | 6255 | else if (VECTOR_MODE_P (mode) |
6256 | ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) | |
6257 | : TREE_CODE (type) != TREE_CODE (typefm)) | |
743a6f47 | 6258 | { |
6259 | error ("mode %qs applied to inappropriate type", p); | |
6260 | return NULL_TREE; | |
6261 | } | |
6262 | ||
b2aef146 | 6263 | *node = typefm; |
f8e93a2e | 6264 | } |
6265 | ||
6266 | return NULL_TREE; | |
6267 | } | |
6268 | ||
6269 | /* Handle a "section" attribute; arguments as in | |
6270 | struct attribute_spec.handler. */ | |
6271 | ||
6272 | static tree | |
9a03a746 | 6273 | handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
6274 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 6275 | { |
6276 | tree decl = *node; | |
6277 | ||
6278 | if (targetm.have_named_sections) | |
6279 | { | |
065efcb1 | 6280 | user_defined_section_attribute = true; |
6281 | ||
f8e93a2e | 6282 | if ((TREE_CODE (decl) == FUNCTION_DECL |
6283 | || TREE_CODE (decl) == VAR_DECL) | |
6284 | && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
6285 | { | |
6286 | if (TREE_CODE (decl) == VAR_DECL | |
6287 | && current_function_decl != NULL_TREE | |
84166705 | 6288 | && !TREE_STATIC (decl)) |
f8e93a2e | 6289 | { |
9bc3739f | 6290 | error ("%Jsection attribute cannot be specified for " |
4ee9c684 | 6291 | "local variables", decl); |
f8e93a2e | 6292 | *no_add_attrs = true; |
6293 | } | |
6294 | ||
6295 | /* The decl may have already been given a section attribute | |
6296 | from a previous declaration. Ensure they match. */ | |
6297 | else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
6298 | && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
6299 | TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
6300 | { | |
3cf8b391 | 6301 | error ("section of %q+D conflicts with previous declaration", |
6302 | *node); | |
f8e93a2e | 6303 | *no_add_attrs = true; |
6304 | } | |
38475469 | 6305 | else if (TREE_CODE (decl) == VAR_DECL |
6306 | && !targetm.have_tls && targetm.emutls.tmpl_section | |
6307 | && DECL_THREAD_LOCAL_P (decl)) | |
6308 | { | |
6309 | error ("section of %q+D cannot be overridden", *node); | |
6310 | *no_add_attrs = true; | |
6311 | } | |
f8e93a2e | 6312 | else |
6313 | DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
6314 | } | |
6315 | else | |
6316 | { | |
3cf8b391 | 6317 | error ("section attribute not allowed for %q+D", *node); |
f8e93a2e | 6318 | *no_add_attrs = true; |
6319 | } | |
6320 | } | |
6321 | else | |
6322 | { | |
9bc3739f | 6323 | error ("%Jsection attributes are not supported for this target", *node); |
f8e93a2e | 6324 | *no_add_attrs = true; |
6325 | } | |
6326 | ||
6327 | return NULL_TREE; | |
6328 | } | |
6329 | ||
6330 | /* Handle a "aligned" attribute; arguments as in | |
6331 | struct attribute_spec.handler. */ | |
6332 | ||
6333 | static tree | |
9a03a746 | 6334 | handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
09347743 | 6335 | int flags, bool *no_add_attrs) |
f8e93a2e | 6336 | { |
6337 | tree decl = NULL_TREE; | |
6338 | tree *type = NULL; | |
6339 | int is_type = 0; | |
6340 | tree align_expr = (args ? TREE_VALUE (args) | |
02421213 | 6341 | : size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT)); |
f8e93a2e | 6342 | int i; |
6343 | ||
6344 | if (DECL_P (*node)) | |
6345 | { | |
6346 | decl = *node; | |
6347 | type = &TREE_TYPE (decl); | |
6348 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
6349 | } | |
6350 | else if (TYPE_P (*node)) | |
6351 | type = node, is_type = 1; | |
6352 | ||
f8e93a2e | 6353 | if (TREE_CODE (align_expr) != INTEGER_CST) |
6354 | { | |
6355 | error ("requested alignment is not a constant"); | |
6356 | *no_add_attrs = true; | |
6357 | } | |
6358 | else if ((i = tree_log2 (align_expr)) == -1) | |
6359 | { | |
6360 | error ("requested alignment is not a power of 2"); | |
6361 | *no_add_attrs = true; | |
6362 | } | |
7cfdc2f0 | 6363 | else if (i >= HOST_BITS_PER_INT - BITS_PER_UNIT_LOG) |
f8e93a2e | 6364 | { |
6365 | error ("requested alignment is too large"); | |
6366 | *no_add_attrs = true; | |
6367 | } | |
6368 | else if (is_type) | |
6369 | { | |
6370 | /* If we have a TYPE_DECL, then copy the type, so that we | |
6371 | don't accidentally modify a builtin type. See pushdecl. */ | |
6372 | if (decl && TREE_TYPE (decl) != error_mark_node | |
6373 | && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
6374 | { | |
6375 | tree tt = TREE_TYPE (decl); | |
e086912e | 6376 | *type = build_variant_type_copy (*type); |
f8e93a2e | 6377 | DECL_ORIGINAL_TYPE (decl) = tt; |
6378 | TYPE_NAME (*type) = decl; | |
6379 | TREE_USED (*type) = TREE_USED (decl); | |
6380 | TREE_TYPE (decl) = *type; | |
6381 | } | |
6382 | else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 6383 | *type = build_variant_type_copy (*type); |
f8e93a2e | 6384 | |
7cfdc2f0 | 6385 | TYPE_ALIGN (*type) = (1U << i) * BITS_PER_UNIT; |
f8e93a2e | 6386 | TYPE_USER_ALIGN (*type) = 1; |
6387 | } | |
097b5c8b | 6388 | else if (! VAR_OR_FUNCTION_DECL_P (decl) |
f8e93a2e | 6389 | && TREE_CODE (decl) != FIELD_DECL) |
6390 | { | |
3cf8b391 | 6391 | error ("alignment may not be specified for %q+D", decl); |
f8e93a2e | 6392 | *no_add_attrs = true; |
6393 | } | |
097b5c8b | 6394 | else if (TREE_CODE (decl) == FUNCTION_DECL |
7cfdc2f0 | 6395 | && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) |
097b5c8b | 6396 | { |
6397 | if (DECL_USER_ALIGN (decl)) | |
6398 | error ("alignment for %q+D was previously specified as %d " | |
6399 | "and may not be decreased", decl, | |
6400 | DECL_ALIGN (decl) / BITS_PER_UNIT); | |
6401 | else | |
6402 | error ("alignment for %q+D must be at least %d", decl, | |
6403 | DECL_ALIGN (decl) / BITS_PER_UNIT); | |
6404 | *no_add_attrs = true; | |
6405 | } | |
f8e93a2e | 6406 | else |
6407 | { | |
7cfdc2f0 | 6408 | DECL_ALIGN (decl) = (1U << i) * BITS_PER_UNIT; |
f8e93a2e | 6409 | DECL_USER_ALIGN (decl) = 1; |
6410 | } | |
6411 | ||
6412 | return NULL_TREE; | |
6413 | } | |
6414 | ||
6415 | /* Handle a "weak" attribute; arguments as in | |
6416 | struct attribute_spec.handler. */ | |
6417 | ||
6418 | static tree | |
f948b309 | 6419 | handle_weak_attribute (tree *node, tree name, |
9a03a746 | 6420 | tree ARG_UNUSED (args), |
6421 | int ARG_UNUSED (flags), | |
6422 | bool * ARG_UNUSED (no_add_attrs)) | |
f8e93a2e | 6423 | { |
f948b309 | 6424 | if (TREE_CODE (*node) == FUNCTION_DECL |
059a60f3 | 6425 | && DECL_DECLARED_INLINE_P (*node)) |
6426 | { | |
6427 | error ("inline function %q+D cannot be declared weak", *node); | |
6428 | *no_add_attrs = true; | |
6429 | } | |
6430 | else if (TREE_CODE (*node) == FUNCTION_DECL | |
6431 | || TREE_CODE (*node) == VAR_DECL) | |
f948b309 | 6432 | declare_weak (*node); |
6433 | else | |
6434 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
f8e93a2e | 6435 | |
6436 | return NULL_TREE; | |
6437 | } | |
6438 | ||
6439 | /* Handle an "alias" attribute; arguments as in | |
6440 | struct attribute_spec.handler. */ | |
6441 | ||
6442 | static tree | |
1cae46be | 6443 | handle_alias_attribute (tree *node, tree name, tree args, |
9a03a746 | 6444 | int ARG_UNUSED (flags), bool *no_add_attrs) |
f8e93a2e | 6445 | { |
6446 | tree decl = *node; | |
6447 | ||
9e830260 | 6448 | if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL) |
6449 | { | |
6450 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6451 | *no_add_attrs = true; | |
6452 | } | |
6453 | else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
0a3ecdc1 | 6454 | || (TREE_CODE (decl) != FUNCTION_DECL |
6455 | && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
6456 | /* A static variable declaration is always a tentative definition, | |
6457 | but the alias is a non-tentative definition which overrides. */ | |
6458 | || (TREE_CODE (decl) != FUNCTION_DECL | |
6459 | && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl))) | |
f8e93a2e | 6460 | { |
3cf8b391 | 6461 | error ("%q+D defined both normally and as an alias", decl); |
f8e93a2e | 6462 | *no_add_attrs = true; |
6463 | } | |
8c42f0d9 | 6464 | |
6465 | /* Note that the very first time we process a nested declaration, | |
6466 | decl_function_context will not be set. Indeed, *would* never | |
6467 | be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
6468 | we do below. After such frobbery, pushdecl would set the context. | |
6469 | In any case, this is never what we want. */ | |
6470 | else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
f8e93a2e | 6471 | { |
6472 | tree id; | |
6473 | ||
6474 | id = TREE_VALUE (args); | |
6475 | if (TREE_CODE (id) != STRING_CST) | |
6476 | { | |
07e3a3d2 | 6477 | error ("alias argument not a string"); |
f8e93a2e | 6478 | *no_add_attrs = true; |
6479 | return NULL_TREE; | |
6480 | } | |
6481 | id = get_identifier (TREE_STRING_POINTER (id)); | |
6482 | /* This counts as a use of the object pointed to. */ | |
6483 | TREE_USED (id) = 1; | |
6484 | ||
6485 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
6486 | DECL_INITIAL (decl) = error_mark_node; | |
6487 | else | |
4ee9c684 | 6488 | { |
f4a30bd7 | 6489 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))) |
6490 | DECL_EXTERNAL (decl) = 1; | |
6491 | else | |
6492 | DECL_EXTERNAL (decl) = 0; | |
4ee9c684 | 6493 | TREE_STATIC (decl) = 1; |
6494 | } | |
f8e93a2e | 6495 | } |
6496 | else | |
6497 | { | |
9b2d6d13 | 6498 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6499 | *no_add_attrs = true; |
6500 | } | |
6501 | ||
6502 | return NULL_TREE; | |
6503 | } | |
6504 | ||
f4a30bd7 | 6505 | /* Handle a "weakref" attribute; arguments as in struct |
6506 | attribute_spec.handler. */ | |
6507 | ||
6508 | static tree | |
6509 | handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
6510 | int flags, bool *no_add_attrs) | |
6511 | { | |
6512 | tree attr = NULL_TREE; | |
6513 | ||
83852912 | 6514 | /* We must ignore the attribute when it is associated with |
6515 | local-scoped decls, since attribute alias is ignored and many | |
6516 | such symbols do not even have a DECL_WEAK field. */ | |
64a7bd81 | 6517 | if (decl_function_context (*node) |
6518 | || current_function_decl | |
6519 | || (TREE_CODE (*node) != VAR_DECL && TREE_CODE (*node) != FUNCTION_DECL)) | |
83852912 | 6520 | { |
6521 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6522 | *no_add_attrs = true; | |
6523 | return NULL_TREE; | |
6524 | } | |
6525 | ||
f4a30bd7 | 6526 | /* The idea here is that `weakref("name")' mutates into `weakref, |
6527 | alias("name")', and weakref without arguments, in turn, | |
6528 | implicitly adds weak. */ | |
6529 | ||
6530 | if (args) | |
6531 | { | |
6532 | attr = tree_cons (get_identifier ("alias"), args, attr); | |
6533 | attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); | |
6534 | ||
6535 | *no_add_attrs = true; | |
0a3ecdc1 | 6536 | |
6537 | decl_attributes (node, attr, flags); | |
f4a30bd7 | 6538 | } |
6539 | else | |
6540 | { | |
6541 | if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) | |
6542 | error ("%Jweakref attribute must appear before alias attribute", | |
6543 | *node); | |
6544 | ||
0a3ecdc1 | 6545 | /* Can't call declare_weak because it wants this to be TREE_PUBLIC, |
6546 | and that isn't supported; and because it wants to add it to | |
6547 | the list of weak decls, which isn't helpful. */ | |
6548 | DECL_WEAK (*node) = 1; | |
f4a30bd7 | 6549 | } |
6550 | ||
f4a30bd7 | 6551 | return NULL_TREE; |
6552 | } | |
6553 | ||
f8e93a2e | 6554 | /* Handle an "visibility" attribute; arguments as in |
6555 | struct attribute_spec.handler. */ | |
6556 | ||
6557 | static tree | |
1cae46be | 6558 | handle_visibility_attribute (tree *node, tree name, tree args, |
9a03a746 | 6559 | int ARG_UNUSED (flags), |
4a2849cb | 6560 | bool *ARG_UNUSED (no_add_attrs)) |
f8e93a2e | 6561 | { |
6562 | tree decl = *node; | |
9c40570a | 6563 | tree id = TREE_VALUE (args); |
4a2849cb | 6564 | enum symbol_visibility vis; |
f8e93a2e | 6565 | |
b212f378 | 6566 | if (TYPE_P (*node)) |
6567 | { | |
4a2849cb | 6568 | if (TREE_CODE (*node) == ENUMERAL_TYPE) |
6569 | /* OK */; | |
6570 | else if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) | |
6571 | { | |
6572 | warning (OPT_Wattributes, "%qE attribute ignored on non-class types", | |
6573 | name); | |
6574 | return NULL_TREE; | |
6575 | } | |
6576 | else if (TYPE_FIELDS (*node)) | |
6577 | { | |
6578 | error ("%qE attribute ignored because %qT is already defined", | |
6579 | name, *node); | |
6580 | return NULL_TREE; | |
6581 | } | |
b212f378 | 6582 | } |
84166705 | 6583 | else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) |
f8e93a2e | 6584 | { |
9b2d6d13 | 6585 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
9c40570a | 6586 | return NULL_TREE; |
f8e93a2e | 6587 | } |
f8e93a2e | 6588 | |
9c40570a | 6589 | if (TREE_CODE (id) != STRING_CST) |
6590 | { | |
07e3a3d2 | 6591 | error ("visibility argument not a string"); |
9c40570a | 6592 | return NULL_TREE; |
f8e93a2e | 6593 | } |
b27ac6b5 | 6594 | |
b212f378 | 6595 | /* If this is a type, set the visibility on the type decl. */ |
6596 | if (TYPE_P (decl)) | |
6597 | { | |
6598 | decl = TYPE_NAME (decl); | |
84166705 | 6599 | if (!decl) |
a0c938f0 | 6600 | return NULL_TREE; |
e147aab3 | 6601 | if (TREE_CODE (decl) == IDENTIFIER_NODE) |
6602 | { | |
9b2d6d13 | 6603 | warning (OPT_Wattributes, "%qE attribute ignored on types", |
e147aab3 | 6604 | name); |
6605 | return NULL_TREE; | |
6606 | } | |
b212f378 | 6607 | } |
f8e93a2e | 6608 | |
9c40570a | 6609 | if (strcmp (TREE_STRING_POINTER (id), "default") == 0) |
4a2849cb | 6610 | vis = VISIBILITY_DEFAULT; |
9c40570a | 6611 | else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) |
4a2849cb | 6612 | vis = VISIBILITY_INTERNAL; |
9c40570a | 6613 | else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) |
4a2849cb | 6614 | vis = VISIBILITY_HIDDEN; |
9c40570a | 6615 | else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) |
4a2849cb | 6616 | vis = VISIBILITY_PROTECTED; |
9c40570a | 6617 | else |
4a2849cb | 6618 | { |
6619 | error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); | |
6620 | vis = VISIBILITY_DEFAULT; | |
6621 | } | |
6622 | ||
6623 | if (DECL_VISIBILITY_SPECIFIED (decl) | |
098a01e7 | 6624 | && vis != DECL_VISIBILITY (decl)) |
6625 | { | |
6626 | tree attributes = (TYPE_P (*node) | |
6627 | ? TYPE_ATTRIBUTES (*node) | |
6628 | : DECL_ATTRIBUTES (decl)); | |
6629 | if (lookup_attribute ("visibility", attributes)) | |
6630 | error ("%qD redeclared with different visibility", decl); | |
6631 | else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6632 | && lookup_attribute ("dllimport", attributes)) | |
6633 | error ("%qD was declared %qs which implies default visibility", | |
6634 | decl, "dllimport"); | |
6635 | else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6636 | && lookup_attribute ("dllexport", attributes)) | |
6637 | error ("%qD was declared %qs which implies default visibility", | |
6638 | decl, "dllexport"); | |
6639 | } | |
4a2849cb | 6640 | |
6641 | DECL_VISIBILITY (decl) = vis; | |
b212f378 | 6642 | DECL_VISIBILITY_SPECIFIED (decl) = 1; |
6643 | ||
4a2849cb | 6644 | /* Go ahead and attach the attribute to the node as well. This is needed |
6645 | so we can determine whether we have VISIBILITY_DEFAULT because the | |
6646 | visibility was not specified, or because it was explicitly overridden | |
6647 | from the containing scope. */ | |
9c40570a | 6648 | |
f8e93a2e | 6649 | return NULL_TREE; |
6650 | } | |
6651 | ||
3aa0c315 | 6652 | /* Determine the ELF symbol visibility for DECL, which is either a |
6653 | variable or a function. It is an error to use this function if a | |
6654 | definition of DECL is not available in this translation unit. | |
6655 | Returns true if the final visibility has been determined by this | |
6656 | function; false if the caller is free to make additional | |
6657 | modifications. */ | |
6658 | ||
6659 | bool | |
6660 | c_determine_visibility (tree decl) | |
6661 | { | |
1d8fc210 | 6662 | gcc_assert (TREE_CODE (decl) == VAR_DECL |
6663 | || TREE_CODE (decl) == FUNCTION_DECL); | |
3aa0c315 | 6664 | |
6665 | /* If the user explicitly specified the visibility with an | |
6666 | attribute, honor that. DECL_VISIBILITY will have been set during | |
6667 | the processing of the attribute. We check for an explicit | |
6668 | attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, | |
6669 | to distinguish the use of an attribute from the use of a "#pragma | |
6670 | GCC visibility push(...)"; in the latter case we still want other | |
6671 | considerations to be able to overrule the #pragma. */ | |
098a01e7 | 6672 | if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)) |
6673 | || (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6674 | && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)) | |
6675 | || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))))) | |
3aa0c315 | 6676 | return true; |
6677 | ||
4a2849cb | 6678 | /* Set default visibility to whatever the user supplied with |
6679 | visibility_specified depending on #pragma GCC visibility. */ | |
6680 | if (!DECL_VISIBILITY_SPECIFIED (decl)) | |
6681 | { | |
2d9d8740 | 6682 | if (visibility_options.inpragma |
6683 | || DECL_VISIBILITY (decl) != default_visibility) | |
6684 | { | |
6685 | DECL_VISIBILITY (decl) = default_visibility; | |
6686 | DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; | |
6687 | /* If visibility changed and DECL already has DECL_RTL, ensure | |
6688 | symbol flags are updated. */ | |
6689 | if (((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) | |
6690 | || TREE_CODE (decl) == FUNCTION_DECL) | |
6691 | && DECL_RTL_SET_P (decl)) | |
6692 | make_decl_rtl (decl); | |
6693 | } | |
4a2849cb | 6694 | } |
3aa0c315 | 6695 | return false; |
6696 | } | |
6697 | ||
24dfead4 | 6698 | /* Handle an "tls_model" attribute; arguments as in |
6699 | struct attribute_spec.handler. */ | |
6700 | ||
6701 | static tree | |
1cae46be | 6702 | handle_tls_model_attribute (tree *node, tree name, tree args, |
9a03a746 | 6703 | int ARG_UNUSED (flags), bool *no_add_attrs) |
24dfead4 | 6704 | { |
1b53eb20 | 6705 | tree id; |
24dfead4 | 6706 | tree decl = *node; |
1b53eb20 | 6707 | enum tls_model kind; |
24dfead4 | 6708 | |
1b53eb20 | 6709 | *no_add_attrs = true; |
6710 | ||
c34f8a78 | 6711 | if (TREE_CODE (decl) != VAR_DECL || !DECL_THREAD_LOCAL_P (decl)) |
24dfead4 | 6712 | { |
9b2d6d13 | 6713 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
1b53eb20 | 6714 | return NULL_TREE; |
24dfead4 | 6715 | } |
24dfead4 | 6716 | |
1b53eb20 | 6717 | kind = DECL_TLS_MODEL (decl); |
6718 | id = TREE_VALUE (args); | |
6719 | if (TREE_CODE (id) != STRING_CST) | |
6720 | { | |
6721 | error ("tls_model argument not a string"); | |
6722 | return NULL_TREE; | |
24dfead4 | 6723 | } |
6724 | ||
1b53eb20 | 6725 | if (!strcmp (TREE_STRING_POINTER (id), "local-exec")) |
6726 | kind = TLS_MODEL_LOCAL_EXEC; | |
6727 | else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec")) | |
6728 | kind = TLS_MODEL_INITIAL_EXEC; | |
6729 | else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic")) | |
6730 | kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; | |
6731 | else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
6732 | kind = TLS_MODEL_GLOBAL_DYNAMIC; | |
6733 | else | |
6734 | error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
6735 | ||
6736 | DECL_TLS_MODEL (decl) = kind; | |
24dfead4 | 6737 | return NULL_TREE; |
6738 | } | |
6739 | ||
f8e93a2e | 6740 | /* Handle a "no_instrument_function" attribute; arguments as in |
6741 | struct attribute_spec.handler. */ | |
6742 | ||
6743 | static tree | |
1cae46be | 6744 | handle_no_instrument_function_attribute (tree *node, tree name, |
9a03a746 | 6745 | tree ARG_UNUSED (args), |
6746 | int ARG_UNUSED (flags), | |
09347743 | 6747 | bool *no_add_attrs) |
f8e93a2e | 6748 | { |
6749 | tree decl = *node; | |
6750 | ||
6751 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
6752 | { | |
b0b1af64 | 6753 | error ("%J%qE attribute applies only to functions", decl, name); |
f8e93a2e | 6754 | *no_add_attrs = true; |
6755 | } | |
6756 | else if (DECL_INITIAL (decl)) | |
6757 | { | |
b0b1af64 | 6758 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
f8e93a2e | 6759 | *no_add_attrs = true; |
6760 | } | |
6761 | else | |
6762 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
6763 | ||
6764 | return NULL_TREE; | |
6765 | } | |
6766 | ||
6767 | /* Handle a "malloc" attribute; arguments as in | |
6768 | struct attribute_spec.handler. */ | |
6769 | ||
6770 | static tree | |
9a03a746 | 6771 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
6772 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 6773 | { |
a5147fca | 6774 | if (TREE_CODE (*node) == FUNCTION_DECL |
6775 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
f8e93a2e | 6776 | DECL_IS_MALLOC (*node) = 1; |
f8e93a2e | 6777 | else |
6778 | { | |
9b2d6d13 | 6779 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6780 | *no_add_attrs = true; |
6781 | } | |
6782 | ||
6783 | return NULL_TREE; | |
6784 | } | |
6785 | ||
4a29c97c | 6786 | /* Handle a "alloc_size" attribute; arguments as in |
6787 | struct attribute_spec.handler. */ | |
6788 | ||
6789 | static tree | |
6790 | handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
6791 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6792 | { | |
2802826e | 6793 | unsigned arg_count = type_num_arguments (*node); |
4a29c97c | 6794 | for (; args; args = TREE_CHAIN (args)) |
6795 | { | |
6796 | tree position = TREE_VALUE (args); | |
6797 | ||
6798 | if (TREE_CODE (position) != INTEGER_CST | |
6799 | || TREE_INT_CST_HIGH (position) | |
6800 | || TREE_INT_CST_LOW (position) < 1 | |
6801 | || TREE_INT_CST_LOW (position) > arg_count ) | |
6802 | { | |
6803 | warning (OPT_Wattributes, | |
6804 | "alloc_size parameter outside range"); | |
6805 | *no_add_attrs = true; | |
6806 | return NULL_TREE; | |
6807 | } | |
6808 | } | |
6809 | return NULL_TREE; | |
6810 | } | |
6811 | ||
26d1c5ff | 6812 | /* Handle a "returns_twice" attribute; arguments as in |
6813 | struct attribute_spec.handler. */ | |
6814 | ||
6815 | static tree | |
6816 | handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6817 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6818 | { | |
6819 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6820 | DECL_IS_RETURNS_TWICE (*node) = 1; | |
6821 | else | |
6822 | { | |
9b2d6d13 | 6823 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
26d1c5ff | 6824 | *no_add_attrs = true; |
6825 | } | |
6826 | ||
6827 | return NULL_TREE; | |
6828 | } | |
6829 | ||
f8e93a2e | 6830 | /* Handle a "no_limit_stack" attribute; arguments as in |
6831 | struct attribute_spec.handler. */ | |
6832 | ||
6833 | static tree | |
1cae46be | 6834 | handle_no_limit_stack_attribute (tree *node, tree name, |
9a03a746 | 6835 | tree ARG_UNUSED (args), |
6836 | int ARG_UNUSED (flags), | |
09347743 | 6837 | bool *no_add_attrs) |
f8e93a2e | 6838 | { |
6839 | tree decl = *node; | |
6840 | ||
6841 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
6842 | { | |
b0b1af64 | 6843 | error ("%J%qE attribute applies only to functions", decl, name); |
f8e93a2e | 6844 | *no_add_attrs = true; |
6845 | } | |
6846 | else if (DECL_INITIAL (decl)) | |
6847 | { | |
b0b1af64 | 6848 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
f8e93a2e | 6849 | *no_add_attrs = true; |
6850 | } | |
6851 | else | |
6852 | DECL_NO_LIMIT_STACK (decl) = 1; | |
6853 | ||
6854 | return NULL_TREE; | |
6855 | } | |
6856 | ||
6857 | /* Handle a "pure" attribute; arguments as in | |
6858 | struct attribute_spec.handler. */ | |
6859 | ||
6860 | static tree | |
9a03a746 | 6861 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
6862 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 6863 | { |
6864 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
9c2a0c05 | 6865 | DECL_PURE_P (*node) = 1; |
f8e93a2e | 6866 | /* ??? TODO: Support types. */ |
6867 | else | |
6868 | { | |
9b2d6d13 | 6869 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6870 | *no_add_attrs = true; |
6871 | } | |
6872 | ||
6873 | return NULL_TREE; | |
6874 | } | |
6875 | ||
fc09b200 | 6876 | /* Handle a "no vops" attribute; arguments as in |
6877 | struct attribute_spec.handler. */ | |
6878 | ||
6879 | static tree | |
6880 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
6881 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6882 | bool *ARG_UNUSED (no_add_attrs)) | |
6883 | { | |
6884 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
6885 | DECL_IS_NOVOPS (*node) = 1; | |
6886 | return NULL_TREE; | |
6887 | } | |
6888 | ||
f8e93a2e | 6889 | /* Handle a "deprecated" attribute; arguments as in |
6890 | struct attribute_spec.handler. */ | |
1cae46be | 6891 | |
f8e93a2e | 6892 | static tree |
1cae46be | 6893 | handle_deprecated_attribute (tree *node, tree name, |
9a03a746 | 6894 | tree ARG_UNUSED (args), int flags, |
09347743 | 6895 | bool *no_add_attrs) |
f8e93a2e | 6896 | { |
6897 | tree type = NULL_TREE; | |
6898 | int warn = 0; | |
782858b8 | 6899 | tree what = NULL_TREE; |
1cae46be | 6900 | |
f8e93a2e | 6901 | if (DECL_P (*node)) |
6902 | { | |
6903 | tree decl = *node; | |
6904 | type = TREE_TYPE (decl); | |
1cae46be | 6905 | |
f8e93a2e | 6906 | if (TREE_CODE (decl) == TYPE_DECL |
6907 | || TREE_CODE (decl) == PARM_DECL | |
6908 | || TREE_CODE (decl) == VAR_DECL | |
6909 | || TREE_CODE (decl) == FUNCTION_DECL | |
6910 | || TREE_CODE (decl) == FIELD_DECL) | |
6911 | TREE_DEPRECATED (decl) = 1; | |
6912 | else | |
6913 | warn = 1; | |
6914 | } | |
6915 | else if (TYPE_P (*node)) | |
6916 | { | |
6917 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 6918 | *node = build_variant_type_copy (*node); |
f8e93a2e | 6919 | TREE_DEPRECATED (*node) = 1; |
6920 | type = *node; | |
6921 | } | |
6922 | else | |
6923 | warn = 1; | |
1cae46be | 6924 | |
f8e93a2e | 6925 | if (warn) |
6926 | { | |
6927 | *no_add_attrs = true; | |
6928 | if (type && TYPE_NAME (type)) | |
6929 | { | |
6930 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
782858b8 | 6931 | what = TYPE_NAME (*node); |
f8e93a2e | 6932 | else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL |
6933 | && DECL_NAME (TYPE_NAME (type))) | |
782858b8 | 6934 | what = DECL_NAME (TYPE_NAME (type)); |
f8e93a2e | 6935 | } |
6936 | if (what) | |
9b2d6d13 | 6937 | warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what); |
f8e93a2e | 6938 | else |
9b2d6d13 | 6939 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6940 | } |
6941 | ||
6942 | return NULL_TREE; | |
6943 | } | |
6944 | ||
f8e93a2e | 6945 | /* Handle a "vector_size" attribute; arguments as in |
6946 | struct attribute_spec.handler. */ | |
6947 | ||
6948 | static tree | |
1cae46be | 6949 | handle_vector_size_attribute (tree *node, tree name, tree args, |
9a03a746 | 6950 | int ARG_UNUSED (flags), |
09347743 | 6951 | bool *no_add_attrs) |
f8e93a2e | 6952 | { |
6953 | unsigned HOST_WIDE_INT vecsize, nunits; | |
83e2a11b | 6954 | enum machine_mode orig_mode; |
4917c376 | 6955 | tree type = *node, new_type, size; |
f8e93a2e | 6956 | |
6957 | *no_add_attrs = true; | |
6958 | ||
4917c376 | 6959 | size = TREE_VALUE (args); |
4917c376 | 6960 | |
84166705 | 6961 | if (!host_integerp (size, 1)) |
f8e93a2e | 6962 | { |
9b2d6d13 | 6963 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 6964 | return NULL_TREE; |
6965 | } | |
6966 | ||
6967 | /* Get the vector size (in bytes). */ | |
4917c376 | 6968 | vecsize = tree_low_cst (size, 1); |
f8e93a2e | 6969 | |
6970 | /* We need to provide for vector pointers, vector arrays, and | |
6971 | functions returning vectors. For example: | |
6972 | ||
6973 | __attribute__((vector_size(16))) short *foo; | |
6974 | ||
6975 | In this case, the mode is SI, but the type being modified is | |
6976 | HI, so we need to look further. */ | |
6977 | ||
6978 | while (POINTER_TYPE_P (type) | |
6979 | || TREE_CODE (type) == FUNCTION_TYPE | |
5bfb0742 | 6980 | || TREE_CODE (type) == METHOD_TYPE |
2cb0e5d9 | 6981 | || TREE_CODE (type) == ARRAY_TYPE |
6982 | || TREE_CODE (type) == OFFSET_TYPE) | |
f8e93a2e | 6983 | type = TREE_TYPE (type); |
6984 | ||
6985 | /* Get the mode of the type being modified. */ | |
6986 | orig_mode = TYPE_MODE (type); | |
6987 | ||
2cb0e5d9 | 6988 | if ((!INTEGRAL_TYPE_P (type) |
6989 | && !SCALAR_FLOAT_TYPE_P (type) | |
6990 | && !FIXED_POINT_TYPE_P (type)) | |
cee7491d | 6991 | || (!SCALAR_FLOAT_MODE_P (orig_mode) |
9421ebb9 | 6992 | && GET_MODE_CLASS (orig_mode) != MODE_INT |
6993 | && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode)) | |
7ec31215 | 6994 | || !host_integerp (TYPE_SIZE_UNIT (type), 1) |
6995 | || TREE_CODE (type) == BOOLEAN_TYPE) | |
f8e93a2e | 6996 | { |
782858b8 | 6997 | error ("invalid vector type for attribute %qE", name); |
f8e93a2e | 6998 | return NULL_TREE; |
6999 | } | |
7000 | ||
39cc3e6d | 7001 | if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) |
7002 | { | |
7003 | error ("vector size not an integral multiple of component size"); | |
7004 | return NULL; | |
7005 | } | |
7006 | ||
7007 | if (vecsize == 0) | |
7008 | { | |
7009 | error ("zero vector size"); | |
7010 | return NULL; | |
7011 | } | |
7012 | ||
f8e93a2e | 7013 | /* Calculate how many units fit in the vector. */ |
7014 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
83e2a11b | 7015 | if (nunits & (nunits - 1)) |
f8e93a2e | 7016 | { |
83e2a11b | 7017 | error ("number of components of the vector not a power of two"); |
f8e93a2e | 7018 | return NULL_TREE; |
7019 | } | |
7020 | ||
83e2a11b | 7021 | new_type = build_vector_type (type, nunits); |
f8e93a2e | 7022 | |
7023 | /* Build back pointers if needed. */ | |
d991e6e8 | 7024 | *node = lang_hooks.types.reconstruct_complex_type (*node, new_type); |
f8e93a2e | 7025 | |
7026 | return NULL_TREE; | |
7027 | } | |
7028 | ||
dbf6c367 | 7029 | /* Handle the "nonnull" attribute. */ |
7030 | static tree | |
9a03a746 | 7031 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), |
7032 | tree args, int ARG_UNUSED (flags), | |
09347743 | 7033 | bool *no_add_attrs) |
dbf6c367 | 7034 | { |
7035 | tree type = *node; | |
7036 | unsigned HOST_WIDE_INT attr_arg_num; | |
7037 | ||
7038 | /* If no arguments are specified, all pointer arguments should be | |
d716ce75 | 7039 | non-null. Verify a full prototype is given so that the arguments |
dbf6c367 | 7040 | will have the correct types when we actually check them later. */ |
84166705 | 7041 | if (!args) |
dbf6c367 | 7042 | { |
84166705 | 7043 | if (!TYPE_ARG_TYPES (type)) |
dbf6c367 | 7044 | { |
7045 | error ("nonnull attribute without arguments on a non-prototype"); | |
4ee9c684 | 7046 | *no_add_attrs = true; |
dbf6c367 | 7047 | } |
7048 | return NULL_TREE; | |
7049 | } | |
7050 | ||
7051 | /* Argument list specified. Verify that each argument number references | |
7052 | a pointer argument. */ | |
7053 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
7054 | { | |
7055 | tree argument; | |
4ee9c684 | 7056 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
dbf6c367 | 7057 | |
84166705 | 7058 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) |
dbf6c367 | 7059 | { |
07e3a3d2 | 7060 | error ("nonnull argument has invalid operand number (argument %lu)", |
dbf6c367 | 7061 | (unsigned long) attr_arg_num); |
7062 | *no_add_attrs = true; | |
7063 | return NULL_TREE; | |
7064 | } | |
7065 | ||
7066 | argument = TYPE_ARG_TYPES (type); | |
7067 | if (argument) | |
7068 | { | |
7069 | for (ck_num = 1; ; ck_num++) | |
7070 | { | |
84166705 | 7071 | if (!argument || ck_num == arg_num) |
dbf6c367 | 7072 | break; |
7073 | argument = TREE_CHAIN (argument); | |
7074 | } | |
7075 | ||
84166705 | 7076 | if (!argument |
dbf6c367 | 7077 | || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
7078 | { | |
07e3a3d2 | 7079 | error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)", |
dbf6c367 | 7080 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
7081 | *no_add_attrs = true; | |
7082 | return NULL_TREE; | |
7083 | } | |
7084 | ||
4ee9c684 | 7085 | if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
dbf6c367 | 7086 | { |
07e3a3d2 | 7087 | error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)", |
dbf6c367 | 7088 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
7089 | *no_add_attrs = true; | |
7090 | return NULL_TREE; | |
7091 | } | |
7092 | } | |
7093 | } | |
7094 | ||
7095 | return NULL_TREE; | |
7096 | } | |
7097 | ||
7098 | /* Check the argument list of a function call for null in argument slots | |
d01f58f9 | 7099 | that are marked as requiring a non-null pointer argument. The NARGS |
7100 | arguments are passed in the array ARGARRAY. | |
7101 | */ | |
dbf6c367 | 7102 | |
7103 | static void | |
d01f58f9 | 7104 | check_function_nonnull (tree attrs, int nargs, tree *argarray) |
dbf6c367 | 7105 | { |
d01f58f9 | 7106 | tree a, args; |
7107 | int i; | |
dbf6c367 | 7108 | |
7109 | for (a = attrs; a; a = TREE_CHAIN (a)) | |
7110 | { | |
7111 | if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
7112 | { | |
4ee9c684 | 7113 | args = TREE_VALUE (a); |
dbf6c367 | 7114 | |
4ee9c684 | 7115 | /* Walk the argument list. If we encounter an argument number we |
7116 | should check for non-null, do it. If the attribute has no args, | |
7117 | then every pointer argument is checked (in which case the check | |
dbf6c367 | 7118 | for pointer type is done in check_nonnull_arg). */ |
d01f58f9 | 7119 | for (i = 0; i < nargs; i++) |
4ee9c684 | 7120 | { |
d01f58f9 | 7121 | if (!args || nonnull_check_p (args, i + 1)) |
e4603171 | 7122 | check_function_arguments_recurse (check_nonnull_arg, NULL, |
d01f58f9 | 7123 | argarray[i], |
7124 | i + 1); | |
4ee9c684 | 7125 | } |
dbf6c367 | 7126 | } |
7127 | } | |
7128 | } | |
7129 | ||
50ca527f | 7130 | /* Check that the Nth argument of a function call (counting backwards |
d01f58f9 | 7131 | from the end) is a (pointer)0. The NARGS arguments are passed in the |
7132 | array ARGARRAY. */ | |
bf6c8de0 | 7133 | |
7134 | static void | |
d01f58f9 | 7135 | check_function_sentinel (tree attrs, int nargs, tree *argarray, tree typelist) |
bf6c8de0 | 7136 | { |
7137 | tree attr = lookup_attribute ("sentinel", attrs); | |
7138 | ||
7139 | if (attr) | |
7140 | { | |
d01f58f9 | 7141 | int len = 0; |
7142 | int pos = 0; | |
7143 | tree sentinel; | |
a0c938f0 | 7144 | |
d01f58f9 | 7145 | /* Skip over the named arguments. */ |
7146 | while (typelist && len < nargs) | |
a0c938f0 | 7147 | { |
d01f58f9 | 7148 | typelist = TREE_CHAIN (typelist); |
7149 | len++; | |
7150 | } | |
50ca527f | 7151 | |
d01f58f9 | 7152 | if (TREE_VALUE (attr)) |
7153 | { | |
7154 | tree p = TREE_VALUE (TREE_VALUE (attr)); | |
7155 | pos = TREE_INT_CST_LOW (p); | |
7156 | } | |
50ca527f | 7157 | |
d01f58f9 | 7158 | /* The sentinel must be one of the varargs, i.e. |
7159 | in position >= the number of fixed arguments. */ | |
7160 | if ((nargs - 1 - pos) < len) | |
7161 | { | |
7162 | warning (OPT_Wformat, | |
7163 | "not enough variable arguments to fit a sentinel"); | |
7164 | return; | |
bf6c8de0 | 7165 | } |
d01f58f9 | 7166 | |
7167 | /* Validate the sentinel. */ | |
7168 | sentinel = argarray[nargs - 1 - pos]; | |
7169 | if ((!POINTER_TYPE_P (TREE_TYPE (sentinel)) | |
7170 | || !integer_zerop (sentinel)) | |
7171 | /* Although __null (in C++) is only an integer we allow it | |
7172 | nevertheless, as we are guaranteed that it's exactly | |
7173 | as wide as a pointer, and we don't want to force | |
7174 | users to cast the NULL they have written there. | |
7175 | We warn with -Wstrict-null-sentinel, though. */ | |
7176 | && (warn_strict_null_sentinel || null_node != sentinel)) | |
7177 | warning (OPT_Wformat, "missing sentinel in function call"); | |
bf6c8de0 | 7178 | } |
7179 | } | |
7180 | ||
dbf6c367 | 7181 | /* Helper for check_function_nonnull; given a list of operands which |
7182 | must be non-null in ARGS, determine if operand PARAM_NUM should be | |
7183 | checked. */ | |
7184 | ||
7185 | static bool | |
1cae46be | 7186 | nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 7187 | { |
4ee9c684 | 7188 | unsigned HOST_WIDE_INT arg_num = 0; |
dbf6c367 | 7189 | |
7190 | for (; args; args = TREE_CHAIN (args)) | |
7191 | { | |
231bd014 | 7192 | bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); |
7193 | ||
7194 | gcc_assert (found); | |
dbf6c367 | 7195 | |
7196 | if (arg_num == param_num) | |
7197 | return true; | |
7198 | } | |
7199 | return false; | |
7200 | } | |
7201 | ||
7202 | /* Check that the function argument PARAM (which is operand number | |
7203 | PARAM_NUM) is non-null. This is called by check_function_nonnull | |
7204 | via check_function_arguments_recurse. */ | |
7205 | ||
7206 | static void | |
9a03a746 | 7207 | check_nonnull_arg (void * ARG_UNUSED (ctx), tree param, |
1cae46be | 7208 | unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 7209 | { |
7210 | /* Just skip checking the argument if it's not a pointer. This can | |
7211 | happen if the "nonnull" attribute was given without an operand | |
7212 | list (which means to check every pointer argument). */ | |
7213 | ||
7214 | if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
7215 | return; | |
7216 | ||
7217 | if (integer_zerop (param)) | |
155b601b | 7218 | warning (OPT_Wnonnull, "null argument where non-null required " |
7219 | "(argument %lu)", (unsigned long) param_num); | |
dbf6c367 | 7220 | } |
7221 | ||
7222 | /* Helper for nonnull attribute handling; fetch the operand number | |
7223 | from the attribute argument list. */ | |
7224 | ||
7225 | static bool | |
1cae46be | 7226 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
dbf6c367 | 7227 | { |
67409385 | 7228 | /* Verify the arg number is a constant. */ |
dbf6c367 | 7229 | if (TREE_CODE (arg_num_expr) != INTEGER_CST |
7230 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
7231 | return false; | |
7232 | ||
7233 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
7234 | return true; | |
7235 | } | |
fa987697 | 7236 | |
7237 | /* Handle a "nothrow" attribute; arguments as in | |
7238 | struct attribute_spec.handler. */ | |
7239 | ||
7240 | static tree | |
9a03a746 | 7241 | handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
7242 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
fa987697 | 7243 | { |
7244 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
7245 | TREE_NOTHROW (*node) = 1; | |
7246 | /* ??? TODO: Support types. */ | |
7247 | else | |
7248 | { | |
9b2d6d13 | 7249 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
fa987697 | 7250 | *no_add_attrs = true; |
7251 | } | |
7252 | ||
7253 | return NULL_TREE; | |
7254 | } | |
7acb29a3 | 7255 | |
7256 | /* Handle a "cleanup" attribute; arguments as in | |
7257 | struct attribute_spec.handler. */ | |
7258 | ||
7259 | static tree | |
1cae46be | 7260 | handle_cleanup_attribute (tree *node, tree name, tree args, |
9a03a746 | 7261 | int ARG_UNUSED (flags), bool *no_add_attrs) |
7acb29a3 | 7262 | { |
7263 | tree decl = *node; | |
7264 | tree cleanup_id, cleanup_decl; | |
7265 | ||
7266 | /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
7267 | for global destructors in C++. This requires infrastructure that | |
7268 | we don't have generically at the moment. It's also not a feature | |
7269 | we'd be missing too much, since we do have attribute constructor. */ | |
7270 | if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
7271 | { | |
9b2d6d13 | 7272 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
7acb29a3 | 7273 | *no_add_attrs = true; |
7274 | return NULL_TREE; | |
7275 | } | |
7276 | ||
7277 | /* Verify that the argument is a function in scope. */ | |
7278 | /* ??? We could support pointers to functions here as well, if | |
7279 | that was considered desirable. */ | |
7280 | cleanup_id = TREE_VALUE (args); | |
7281 | if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
7282 | { | |
07e3a3d2 | 7283 | error ("cleanup argument not an identifier"); |
7acb29a3 | 7284 | *no_add_attrs = true; |
7285 | return NULL_TREE; | |
7286 | } | |
d1c41717 | 7287 | cleanup_decl = lookup_name (cleanup_id); |
7acb29a3 | 7288 | if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) |
7289 | { | |
07e3a3d2 | 7290 | error ("cleanup argument not a function"); |
7acb29a3 | 7291 | *no_add_attrs = true; |
7292 | return NULL_TREE; | |
7293 | } | |
7294 | ||
1cae46be | 7295 | /* That the function has proper type is checked with the |
7acb29a3 | 7296 | eventual call to build_function_call. */ |
7297 | ||
7298 | return NULL_TREE; | |
7299 | } | |
8a8cdb8d | 7300 | |
7301 | /* Handle a "warn_unused_result" attribute. No special handling. */ | |
7302 | ||
7303 | static tree | |
7304 | handle_warn_unused_result_attribute (tree *node, tree name, | |
9a03a746 | 7305 | tree ARG_UNUSED (args), |
7306 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
8a8cdb8d | 7307 | { |
7308 | /* Ignore the attribute for functions not returning any value. */ | |
7309 | if (VOID_TYPE_P (TREE_TYPE (*node))) | |
7310 | { | |
9b2d6d13 | 7311 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
8a8cdb8d | 7312 | *no_add_attrs = true; |
7313 | } | |
7314 | ||
7315 | return NULL_TREE; | |
7316 | } | |
bf6c8de0 | 7317 | |
7318 | /* Handle a "sentinel" attribute. */ | |
7319 | ||
7320 | static tree | |
50ca527f | 7321 | handle_sentinel_attribute (tree *node, tree name, tree args, |
bf6c8de0 | 7322 | int ARG_UNUSED (flags), bool *no_add_attrs) |
7323 | { | |
7324 | tree params = TYPE_ARG_TYPES (*node); | |
7325 | ||
7326 | if (!params) | |
7327 | { | |
9b2d6d13 | 7328 | warning (OPT_Wattributes, |
7329 | "%qE attribute requires prototypes with named arguments", name); | |
bf6c8de0 | 7330 | *no_add_attrs = true; |
bf6c8de0 | 7331 | } |
50ca527f | 7332 | else |
7333 | { | |
7334 | while (TREE_CHAIN (params)) | |
7335 | params = TREE_CHAIN (params); | |
bf6c8de0 | 7336 | |
50ca527f | 7337 | if (VOID_TYPE_P (TREE_VALUE (params))) |
a0c938f0 | 7338 | { |
9b2d6d13 | 7339 | warning (OPT_Wattributes, |
7340 | "%qE attribute only applies to variadic functions", name); | |
50ca527f | 7341 | *no_add_attrs = true; |
7342 | } | |
7343 | } | |
a0c938f0 | 7344 | |
50ca527f | 7345 | if (args) |
bf6c8de0 | 7346 | { |
50ca527f | 7347 | tree position = TREE_VALUE (args); |
7348 | ||
50ca527f | 7349 | if (TREE_CODE (position) != INTEGER_CST) |
a0c938f0 | 7350 | { |
01b54db5 | 7351 | warning (OPT_Wattributes, |
7352 | "requested position is not an integer constant"); | |
50ca527f | 7353 | *no_add_attrs = true; |
7354 | } | |
7355 | else | |
a0c938f0 | 7356 | { |
50ca527f | 7357 | if (tree_int_cst_lt (position, integer_zero_node)) |
7358 | { | |
01b54db5 | 7359 | warning (OPT_Wattributes, |
7360 | "requested position is less than zero"); | |
50ca527f | 7361 | *no_add_attrs = true; |
7362 | } | |
7363 | } | |
bf6c8de0 | 7364 | } |
a0c938f0 | 7365 | |
bf6c8de0 | 7366 | return NULL_TREE; |
7367 | } | |
b5c26b42 | 7368 | |
7369 | /* Handle a "type_generic" attribute. */ | |
7370 | ||
7371 | static tree | |
7372 | handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
7373 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
7374 | bool * ARG_UNUSED (no_add_attrs)) | |
7375 | { | |
19fbe3a4 | 7376 | tree params; |
7377 | ||
7378 | /* Ensure we have a function type. */ | |
7379 | gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
7380 | ||
7381 | params = TYPE_ARG_TYPES (*node); | |
7382 | while (params && ! VOID_TYPE_P (TREE_VALUE (params))) | |
7383 | params = TREE_CHAIN (params); | |
7384 | ||
7385 | /* Ensure we have a variadic function. */ | |
7386 | gcc_assert (!params); | |
b5c26b42 | 7387 | |
7388 | return NULL_TREE; | |
7389 | } | |
46f8e3b0 | 7390 | |
24470055 | 7391 | /* Handle a "target" attribute. */ |
46f8e3b0 | 7392 | |
7393 | static tree | |
24470055 | 7394 | handle_target_attribute (tree *node, tree name, tree args, int flags, |
46f8e3b0 | 7395 | bool *no_add_attrs) |
7396 | { | |
7397 | /* Ensure we have a function type. */ | |
7398 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
7399 | { | |
7400 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7401 | *no_add_attrs = true; | |
7402 | } | |
46f8e3b0 | 7403 | else if (! targetm.target_option.valid_attribute_p (*node, name, args, |
7404 | flags)) | |
7405 | *no_add_attrs = true; | |
7406 | ||
7407 | return NULL_TREE; | |
7408 | } | |
7409 | ||
7410 | /* Arguments being collected for optimization. */ | |
7411 | typedef const char *const_char_p; /* For DEF_VEC_P. */ | |
7412 | DEF_VEC_P(const_char_p); | |
7413 | DEF_VEC_ALLOC_P(const_char_p, gc); | |
7414 | static GTY(()) VEC(const_char_p, gc) *optimize_args; | |
7415 | ||
7416 | ||
7417 | /* Inner function to convert a TREE_LIST to argv string to parse the optimize | |
7418 | options in ARGS. ATTR_P is true if this is for attribute(optimize), and | |
7419 | false for #pragma GCC optimize. */ | |
7420 | ||
7421 | bool | |
7422 | parse_optimize_options (tree args, bool attr_p) | |
7423 | { | |
7424 | bool ret = true; | |
7425 | unsigned opt_argc; | |
7426 | unsigned i; | |
2becf397 | 7427 | int saved_flag_strict_aliasing; |
46f8e3b0 | 7428 | const char **opt_argv; |
7429 | tree ap; | |
7430 | ||
7431 | /* Build up argv vector. Just in case the string is stored away, use garbage | |
7432 | collected strings. */ | |
7433 | VEC_truncate (const_char_p, optimize_args, 0); | |
7434 | VEC_safe_push (const_char_p, gc, optimize_args, NULL); | |
7435 | ||
7436 | for (ap = args; ap != NULL_TREE; ap = TREE_CHAIN (ap)) | |
7437 | { | |
7438 | tree value = TREE_VALUE (ap); | |
7439 | ||
7440 | if (TREE_CODE (value) == INTEGER_CST) | |
7441 | { | |
7442 | char buffer[20]; | |
7443 | sprintf (buffer, "-O%ld", (long) TREE_INT_CST_LOW (value)); | |
7444 | VEC_safe_push (const_char_p, gc, optimize_args, ggc_strdup (buffer)); | |
7445 | } | |
7446 | ||
7447 | else if (TREE_CODE (value) == STRING_CST) | |
7448 | { | |
7449 | /* Split string into multiple substrings. */ | |
7450 | size_t len = TREE_STRING_LENGTH (value); | |
7451 | char *p = ASTRDUP (TREE_STRING_POINTER (value)); | |
7452 | char *end = p + len; | |
7453 | char *comma; | |
7454 | char *next_p = p; | |
7455 | ||
7456 | while (next_p != NULL) | |
7457 | { | |
7458 | size_t len2; | |
7459 | char *q, *r; | |
7460 | ||
7461 | p = next_p; | |
7462 | comma = strchr (p, ','); | |
7463 | if (comma) | |
7464 | { | |
7465 | len2 = comma - p; | |
7466 | *comma = '\0'; | |
7467 | next_p = comma+1; | |
7468 | } | |
7469 | else | |
7470 | { | |
7471 | len2 = end - p; | |
7472 | next_p = NULL; | |
7473 | } | |
7474 | ||
7475 | r = q = (char *) ggc_alloc (len2 + 3); | |
7476 | ||
7477 | /* If the user supplied -Oxxx or -fxxx, only allow -Oxxx or -fxxx | |
7478 | options. */ | |
7479 | if (*p == '-' && p[1] != 'O' && p[1] != 'f') | |
7480 | { | |
7481 | ret = false; | |
7482 | if (attr_p) | |
7483 | warning (OPT_Wattributes, | |
7484 | "Bad option %s to optimize attribute.", p); | |
7485 | else | |
7486 | warning (OPT_Wpragmas, | |
7487 | "Bad option %s to pragma attribute", p); | |
7488 | continue; | |
7489 | } | |
7490 | ||
7491 | if (*p != '-') | |
7492 | { | |
7493 | *r++ = '-'; | |
7494 | ||
7495 | /* Assume that Ox is -Ox, a numeric value is -Ox, a s by | |
7496 | itself is -Os, and any other switch begins with a -f. */ | |
7497 | if ((*p >= '0' && *p <= '9') | |
7498 | || (p[0] == 's' && p[1] == '\0')) | |
7499 | *r++ = 'O'; | |
7500 | else if (*p != 'O') | |
7501 | *r++ = 'f'; | |
7502 | } | |
7503 | ||
7504 | memcpy (r, p, len2); | |
7505 | r[len2] = '\0'; | |
7506 | VEC_safe_push (const_char_p, gc, optimize_args, q); | |
7507 | } | |
7508 | ||
7509 | } | |
7510 | } | |
7511 | ||
7512 | opt_argc = VEC_length (const_char_p, optimize_args); | |
7513 | opt_argv = (const char **) alloca (sizeof (char *) * (opt_argc + 1)); | |
7514 | ||
7515 | for (i = 1; i < opt_argc; i++) | |
7516 | opt_argv[i] = VEC_index (const_char_p, optimize_args, i); | |
7517 | ||
2becf397 | 7518 | saved_flag_strict_aliasing = flag_strict_aliasing; |
7519 | ||
46f8e3b0 | 7520 | /* Now parse the options. */ |
7521 | decode_options (opt_argc, opt_argv); | |
7522 | ||
2becf397 | 7523 | /* Don't allow changing -fstrict-aliasing. */ |
7524 | flag_strict_aliasing = saved_flag_strict_aliasing; | |
7525 | ||
46f8e3b0 | 7526 | VEC_truncate (const_char_p, optimize_args, 0); |
7527 | return ret; | |
7528 | } | |
7529 | ||
7530 | /* For handling "optimize" attribute. arguments as in | |
7531 | struct attribute_spec.handler. */ | |
7532 | ||
7533 | static tree | |
7534 | handle_optimize_attribute (tree *node, tree name, tree args, | |
7535 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
7536 | { | |
7537 | /* Ensure we have a function type. */ | |
7538 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
7539 | { | |
7540 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7541 | *no_add_attrs = true; | |
7542 | } | |
7543 | else | |
7544 | { | |
7545 | struct cl_optimization cur_opts; | |
7546 | tree old_opts = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node); | |
7547 | ||
7548 | /* Save current options. */ | |
7549 | cl_optimization_save (&cur_opts); | |
7550 | ||
7551 | /* If we previously had some optimization options, use them as the | |
7552 | default. */ | |
7553 | if (old_opts) | |
7554 | cl_optimization_restore (TREE_OPTIMIZATION (old_opts)); | |
7555 | ||
7556 | /* Parse options, and update the vector. */ | |
7557 | parse_optimize_options (args, true); | |
7558 | DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) | |
7559 | = build_optimization_node (); | |
7560 | ||
7561 | /* Restore current options. */ | |
7562 | cl_optimization_restore (&cur_opts); | |
7563 | } | |
7564 | ||
7565 | return NULL_TREE; | |
7566 | } | |
dbf6c367 | 7567 | \f |
d01f58f9 | 7568 | /* Check for valid arguments being passed to a function. |
7569 | ATTRS is a list of attributes. There are NARGS arguments in the array | |
7570 | ARGARRAY. TYPELIST is the list of argument types for the function. | |
7571 | */ | |
dbf6c367 | 7572 | void |
d01f58f9 | 7573 | check_function_arguments (tree attrs, int nargs, tree *argarray, tree typelist) |
dbf6c367 | 7574 | { |
7575 | /* Check for null being passed in a pointer argument that must be | |
7576 | non-null. We also need to do this if format checking is enabled. */ | |
7577 | ||
7578 | if (warn_nonnull) | |
d01f58f9 | 7579 | check_function_nonnull (attrs, nargs, argarray); |
dbf6c367 | 7580 | |
7581 | /* Check for errors in format strings. */ | |
7582 | ||
95c90e04 | 7583 | if (warn_format || warn_missing_format_attribute) |
d01f58f9 | 7584 | check_function_format (attrs, nargs, argarray); |
95c90e04 | 7585 | |
7586 | if (warn_format) | |
d01f58f9 | 7587 | check_function_sentinel (attrs, nargs, argarray, typelist); |
dbf6c367 | 7588 | } |
7589 | ||
7590 | /* Generic argument checking recursion routine. PARAM is the argument to | |
7591 | be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
7592 | once the argument is resolved. CTX is context for the callback. */ | |
7593 | void | |
1cae46be | 7594 | check_function_arguments_recurse (void (*callback) |
7595 | (void *, tree, unsigned HOST_WIDE_INT), | |
7596 | void *ctx, tree param, | |
7597 | unsigned HOST_WIDE_INT param_num) | |
dbf6c367 | 7598 | { |
72dd6141 | 7599 | if (CONVERT_EXPR_P (param) |
c44afe23 | 7600 | && (TYPE_PRECISION (TREE_TYPE (param)) |
7601 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (param, 0))))) | |
dbf6c367 | 7602 | { |
7603 | /* Strip coercion. */ | |
7604 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 7605 | TREE_OPERAND (param, 0), param_num); |
dbf6c367 | 7606 | return; |
7607 | } | |
7608 | ||
7609 | if (TREE_CODE (param) == CALL_EXPR) | |
7610 | { | |
c2f47e15 | 7611 | tree type = TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (param))); |
dbf6c367 | 7612 | tree attrs; |
7613 | bool found_format_arg = false; | |
7614 | ||
7615 | /* See if this is a call to a known internationalization function | |
7616 | that modifies a format arg. Such a function may have multiple | |
7617 | format_arg attributes (for example, ngettext). */ | |
7618 | ||
7619 | for (attrs = TYPE_ATTRIBUTES (type); | |
7620 | attrs; | |
7621 | attrs = TREE_CHAIN (attrs)) | |
7622 | if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
7623 | { | |
c2f47e15 | 7624 | tree inner_arg; |
dbf6c367 | 7625 | tree format_num_expr; |
7626 | int format_num; | |
7627 | int i; | |
c2f47e15 | 7628 | call_expr_arg_iterator iter; |
dbf6c367 | 7629 | |
7630 | /* Extract the argument number, which was previously checked | |
7631 | to be valid. */ | |
7632 | format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
dbf6c367 | 7633 | |
231bd014 | 7634 | gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST |
7635 | && !TREE_INT_CST_HIGH (format_num_expr)); | |
dbf6c367 | 7636 | |
7637 | format_num = TREE_INT_CST_LOW (format_num_expr); | |
7638 | ||
c2f47e15 | 7639 | for (inner_arg = first_call_expr_arg (param, &iter), i = 1; |
7640 | inner_arg != 0; | |
7641 | inner_arg = next_call_expr_arg (&iter), i++) | |
dbf6c367 | 7642 | if (i == format_num) |
7643 | { | |
7644 | check_function_arguments_recurse (callback, ctx, | |
c2f47e15 | 7645 | inner_arg, param_num); |
dbf6c367 | 7646 | found_format_arg = true; |
7647 | break; | |
7648 | } | |
7649 | } | |
7650 | ||
7651 | /* If we found a format_arg attribute and did a recursive check, | |
7652 | we are done with checking this argument. Otherwise, we continue | |
7653 | and this will be considered a non-literal. */ | |
7654 | if (found_format_arg) | |
7655 | return; | |
7656 | } | |
7657 | ||
7658 | if (TREE_CODE (param) == COND_EXPR) | |
7659 | { | |
7660 | /* Check both halves of the conditional expression. */ | |
7661 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 7662 | TREE_OPERAND (param, 1), param_num); |
dbf6c367 | 7663 | check_function_arguments_recurse (callback, ctx, |
4ee9c684 | 7664 | TREE_OPERAND (param, 2), param_num); |
dbf6c367 | 7665 | return; |
7666 | } | |
7667 | ||
7668 | (*callback) (ctx, param, param_num); | |
7669 | } | |
1f3233d1 | 7670 | |
d43cee80 | 7671 | /* Checks the number of arguments NARGS against the required number |
7672 | REQUIRED and issues an error if there is a mismatch. Returns true | |
7673 | if the number of arguments is correct, otherwise false. */ | |
7674 | ||
7675 | static bool | |
7676 | validate_nargs (tree fndecl, int nargs, int required) | |
7677 | { | |
7678 | if (nargs < required) | |
7679 | { | |
7680 | error ("not enough arguments to function %qE", fndecl); | |
7681 | return false; | |
7682 | } | |
7683 | else if (nargs > required) | |
7684 | { | |
7685 | error ("too many arguments to function %qE", fndecl); | |
7686 | return false; | |
7687 | } | |
7688 | return true; | |
7689 | } | |
7690 | ||
7691 | /* Verifies the NARGS arguments ARGS to the builtin function FNDECL. | |
7692 | Returns false if there was an error, otherwise true. */ | |
7693 | ||
7694 | bool | |
7695 | check_builtin_function_arguments (tree fndecl, int nargs, tree *args) | |
7696 | { | |
7697 | if (!DECL_BUILT_IN (fndecl) | |
7698 | || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL) | |
7699 | return true; | |
7700 | ||
7701 | switch (DECL_FUNCTION_CODE (fndecl)) | |
7702 | { | |
7703 | case BUILT_IN_CONSTANT_P: | |
7704 | return validate_nargs (fndecl, nargs, 1); | |
7705 | ||
7706 | case BUILT_IN_ISFINITE: | |
7707 | case BUILT_IN_ISINF: | |
c319d56a | 7708 | case BUILT_IN_ISINF_SIGN: |
d43cee80 | 7709 | case BUILT_IN_ISNAN: |
7710 | case BUILT_IN_ISNORMAL: | |
7711 | if (validate_nargs (fndecl, nargs, 1)) | |
7712 | { | |
7713 | if (TREE_CODE (TREE_TYPE (args[0])) != REAL_TYPE) | |
7714 | { | |
7715 | error ("non-floating-point argument in call to " | |
7716 | "function %qE", fndecl); | |
7717 | return false; | |
7718 | } | |
7719 | return true; | |
7720 | } | |
7721 | return false; | |
7722 | ||
7723 | case BUILT_IN_ISGREATER: | |
7724 | case BUILT_IN_ISGREATEREQUAL: | |
7725 | case BUILT_IN_ISLESS: | |
7726 | case BUILT_IN_ISLESSEQUAL: | |
7727 | case BUILT_IN_ISLESSGREATER: | |
7728 | case BUILT_IN_ISUNORDERED: | |
7729 | if (validate_nargs (fndecl, nargs, 2)) | |
7730 | { | |
7731 | enum tree_code code0, code1; | |
7732 | code0 = TREE_CODE (TREE_TYPE (args[0])); | |
7733 | code1 = TREE_CODE (TREE_TYPE (args[1])); | |
7734 | if (!((code0 == REAL_TYPE && code1 == REAL_TYPE) | |
7735 | || (code0 == REAL_TYPE && code1 == INTEGER_TYPE) | |
7736 | || (code0 == INTEGER_TYPE && code1 == REAL_TYPE))) | |
7737 | { | |
7738 | error ("non-floating-point arguments in call to " | |
7739 | "function %qE", fndecl); | |
7740 | return false; | |
7741 | } | |
7742 | return true; | |
7743 | } | |
7744 | return false; | |
7745 | ||
19fbe3a4 | 7746 | case BUILT_IN_FPCLASSIFY: |
7747 | if (validate_nargs (fndecl, nargs, 6)) | |
7748 | { | |
7749 | unsigned i; | |
7750 | ||
7751 | for (i=0; i<5; i++) | |
7752 | if (TREE_CODE (args[i]) != INTEGER_CST) | |
7753 | { | |
7754 | error ("non-const integer argument %u in call to function %qE", | |
7755 | i+1, fndecl); | |
7756 | return false; | |
7757 | } | |
7758 | ||
7759 | if (TREE_CODE (TREE_TYPE (args[5])) != REAL_TYPE) | |
7760 | { | |
7761 | error ("non-floating-point argument in call to function %qE", | |
7762 | fndecl); | |
7763 | return false; | |
7764 | } | |
7765 | return true; | |
7766 | } | |
7767 | return false; | |
7768 | ||
d43cee80 | 7769 | default: |
7770 | return true; | |
7771 | } | |
7772 | } | |
7773 | ||
860251be | 7774 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
7775 | ||
7776 | int | |
7777 | field_decl_cmp (const void *x_p, const void *y_p) | |
7778 | { | |
4fd61bc6 | 7779 | const tree *const x = (const tree *const) x_p; |
7780 | const tree *const y = (const tree *const) y_p; | |
7781 | ||
860251be | 7782 | if (DECL_NAME (*x) == DECL_NAME (*y)) |
7783 | /* A nontype is "greater" than a type. */ | |
7784 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
7785 | if (DECL_NAME (*x) == NULL_TREE) | |
7786 | return -1; | |
7787 | if (DECL_NAME (*y) == NULL_TREE) | |
7788 | return 1; | |
7789 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
7790 | return -1; | |
7791 | return 1; | |
7792 | } | |
7793 | ||
7794 | static struct { | |
7795 | gt_pointer_operator new_value; | |
7796 | void *cookie; | |
7797 | } resort_data; | |
7798 | ||
7799 | /* This routine compares two fields like field_decl_cmp but using the | |
7800 | pointer operator in resort_data. */ | |
7801 | ||
7802 | static int | |
7803 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
7804 | { | |
4fd61bc6 | 7805 | const tree *const x = (const tree *const) x_p; |
7806 | const tree *const y = (const tree *const) y_p; | |
860251be | 7807 | |
7808 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
7809 | /* A nontype is "greater" than a type. */ | |
7810 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
7811 | if (DECL_NAME (*x) == NULL_TREE) | |
7812 | return -1; | |
7813 | if (DECL_NAME (*y) == NULL_TREE) | |
7814 | return 1; | |
7815 | { | |
7816 | tree d1 = DECL_NAME (*x); | |
7817 | tree d2 = DECL_NAME (*y); | |
7818 | resort_data.new_value (&d1, resort_data.cookie); | |
7819 | resort_data.new_value (&d2, resort_data.cookie); | |
7820 | if (d1 < d2) | |
7821 | return -1; | |
7822 | } | |
7823 | return 1; | |
7824 | } | |
7825 | ||
7826 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
7827 | ||
7828 | void | |
7829 | resort_sorted_fields (void *obj, | |
9a03a746 | 7830 | void * ARG_UNUSED (orig_obj), |
4ee9c684 | 7831 | gt_pointer_operator new_value, |
7832 | void *cookie) | |
860251be | 7833 | { |
9a03a746 | 7834 | struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; |
860251be | 7835 | resort_data.new_value = new_value; |
7836 | resort_data.cookie = cookie; | |
7837 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
4ee9c684 | 7838 | resort_field_decl_cmp); |
860251be | 7839 | } |
7840 | ||
209c9752 | 7841 | /* Subroutine of c_parse_error. |
7842 | Return the result of concatenating LHS and RHS. RHS is really | |
7843 | a string literal, its first character is indicated by RHS_START and | |
cfee01e3 | 7844 | RHS_SIZE is its length (including the terminating NUL character). |
209c9752 | 7845 | |
7846 | The caller is responsible for deleting the returned pointer. */ | |
7847 | ||
7848 | static char * | |
7849 | catenate_strings (const char *lhs, const char *rhs_start, int rhs_size) | |
7850 | { | |
7851 | const int lhs_size = strlen (lhs); | |
7852 | char *result = XNEWVEC (char, lhs_size + rhs_size); | |
7853 | strncpy (result, lhs, lhs_size); | |
7854 | strncpy (result + lhs_size, rhs_start, rhs_size); | |
7855 | return result; | |
7856 | } | |
7857 | ||
380c6697 | 7858 | /* Issue the error given by GMSGID, indicating that it occurred before |
92b128ed | 7859 | TOKEN, which had the associated VALUE. */ |
7860 | ||
7861 | void | |
380c6697 | 7862 | c_parse_error (const char *gmsgid, enum cpp_ttype token, tree value) |
92b128ed | 7863 | { |
209c9752 | 7864 | #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2)) |
7865 | ||
7866 | char *message = NULL; | |
92b128ed | 7867 | |
7868 | if (token == CPP_EOF) | |
380c6697 | 7869 | message = catenate_messages (gmsgid, " at end of input"); |
924bbf02 | 7870 | else if (token == CPP_CHAR || token == CPP_WCHAR || token == CPP_CHAR16 |
7871 | || token == CPP_CHAR32) | |
92b128ed | 7872 | { |
7873 | unsigned int val = TREE_INT_CST_LOW (value); | |
924bbf02 | 7874 | const char *prefix; |
7875 | ||
7876 | switch (token) | |
7877 | { | |
7878 | default: | |
7879 | prefix = ""; | |
7880 | break; | |
7881 | case CPP_WCHAR: | |
7882 | prefix = "L"; | |
7883 | break; | |
7884 | case CPP_CHAR16: | |
7885 | prefix = "u"; | |
7886 | break; | |
7887 | case CPP_CHAR32: | |
7888 | prefix = "U"; | |
7889 | break; | |
7890 | } | |
7891 | ||
92b128ed | 7892 | if (val <= UCHAR_MAX && ISGRAPH (val)) |
a0c938f0 | 7893 | message = catenate_messages (gmsgid, " before %s'%c'"); |
92b128ed | 7894 | else |
a0c938f0 | 7895 | message = catenate_messages (gmsgid, " before %s'\\x%x'"); |
209c9752 | 7896 | |
924bbf02 | 7897 | error (message, prefix, val); |
209c9752 | 7898 | free (message); |
7899 | message = NULL; | |
92b128ed | 7900 | } |
924bbf02 | 7901 | else if (token == CPP_STRING || token == CPP_WSTRING || token == CPP_STRING16 |
7902 | || token == CPP_STRING32) | |
380c6697 | 7903 | message = catenate_messages (gmsgid, " before string constant"); |
92b128ed | 7904 | else if (token == CPP_NUMBER) |
380c6697 | 7905 | message = catenate_messages (gmsgid, " before numeric constant"); |
92b128ed | 7906 | else if (token == CPP_NAME) |
209c9752 | 7907 | { |
380c6697 | 7908 | message = catenate_messages (gmsgid, " before %qE"); |
782858b8 | 7909 | error (message, value); |
209c9752 | 7910 | free (message); |
7911 | message = NULL; | |
7912 | } | |
b75b98aa | 7913 | else if (token == CPP_PRAGMA) |
7914 | message = catenate_messages (gmsgid, " before %<#pragma%>"); | |
7915 | else if (token == CPP_PRAGMA_EOL) | |
7916 | message = catenate_messages (gmsgid, " before end of line"); | |
92b128ed | 7917 | else if (token < N_TTYPES) |
209c9752 | 7918 | { |
380c6697 | 7919 | message = catenate_messages (gmsgid, " before %qs token"); |
209c9752 | 7920 | error (message, cpp_type2name (token)); |
7921 | free (message); | |
7922 | message = NULL; | |
7923 | } | |
92b128ed | 7924 | else |
380c6697 | 7925 | error (gmsgid); |
209c9752 | 7926 | |
7927 | if (message) | |
7928 | { | |
7929 | error (message); | |
7930 | free (message); | |
7931 | } | |
a0c938f0 | 7932 | #undef catenate_messages |
92b128ed | 7933 | } |
7934 | ||
7f5f3953 | 7935 | /* Callback from cpp_error for PFILE to print diagnostics from the |
7936 | preprocessor. The diagnostic is of type LEVEL, at location | |
7937 | LOCATION unless this is after lexing and the compiler's location | |
7938 | should be used instead, with column number possibly overridden by | |
7939 | COLUMN_OVERRIDE if not zero; MSG is the translated message and AP | |
7940 | the arguments. Returns true if a diagnostic was emitted, false | |
7941 | otherwise. */ | |
7942 | ||
7943 | bool | |
7944 | c_cpp_error (cpp_reader *pfile ATTRIBUTE_UNUSED, int level, | |
7945 | location_t location, unsigned int column_override, | |
7946 | const char *msg, va_list *ap) | |
7947 | { | |
7948 | diagnostic_info diagnostic; | |
7949 | diagnostic_t dlevel; | |
7950 | int save_warn_system_headers = warn_system_headers; | |
7951 | bool ret; | |
7952 | ||
7953 | switch (level) | |
7954 | { | |
7955 | case CPP_DL_WARNING_SYSHDR: | |
7956 | if (flag_no_output) | |
7957 | return false; | |
7958 | warn_system_headers = 1; | |
7959 | /* Fall through. */ | |
7960 | case CPP_DL_WARNING: | |
7961 | if (flag_no_output) | |
7962 | return false; | |
7963 | dlevel = DK_WARNING; | |
7964 | break; | |
7965 | case CPP_DL_PEDWARN: | |
7966 | if (flag_no_output && !flag_pedantic_errors) | |
7967 | return false; | |
7968 | dlevel = DK_PEDWARN; | |
7969 | break; | |
7970 | case CPP_DL_ERROR: | |
7971 | dlevel = DK_ERROR; | |
7972 | break; | |
7973 | case CPP_DL_ICE: | |
7974 | dlevel = DK_ICE; | |
7975 | break; | |
7976 | case CPP_DL_NOTE: | |
7977 | dlevel = DK_NOTE; | |
7978 | break; | |
7979 | default: | |
7980 | gcc_unreachable (); | |
7981 | } | |
7982 | if (done_lexing) | |
7983 | location = input_location; | |
7984 | diagnostic_set_info_translated (&diagnostic, msg, ap, | |
7985 | location, dlevel); | |
7986 | if (column_override) | |
7987 | diagnostic_override_column (&diagnostic, column_override); | |
7988 | ret = report_diagnostic (&diagnostic); | |
7989 | if (level == CPP_DL_WARNING_SYSHDR) | |
7990 | warn_system_headers = save_warn_system_headers; | |
7991 | return ret; | |
7992 | } | |
7993 | ||
4ee9c684 | 7994 | /* Walk a gimplified function and warn for functions whose return value is |
7995 | ignored and attribute((warn_unused_result)) is set. This is done before | |
b27ac6b5 | 7996 | inlining, so we don't have to worry about that. */ |
7997 | ||
4ee9c684 | 7998 | void |
75a70cf9 | 7999 | c_warn_unused_result (gimple_seq seq) |
4ee9c684 | 8000 | { |
4ee9c684 | 8001 | tree fdecl, ftype; |
75a70cf9 | 8002 | gimple_stmt_iterator i; |
4ee9c684 | 8003 | |
75a70cf9 | 8004 | for (i = gsi_start (seq); !gsi_end_p (i); gsi_next (&i)) |
4ee9c684 | 8005 | { |
75a70cf9 | 8006 | gimple g = gsi_stmt (i); |
4ee9c684 | 8007 | |
75a70cf9 | 8008 | switch (gimple_code (g)) |
4ee9c684 | 8009 | { |
75a70cf9 | 8010 | case GIMPLE_BIND: |
8011 | c_warn_unused_result (gimple_bind_body (g)); | |
8012 | break; | |
8013 | case GIMPLE_TRY: | |
8014 | c_warn_unused_result (gimple_try_eval (g)); | |
8015 | c_warn_unused_result (gimple_try_cleanup (g)); | |
8016 | break; | |
8017 | case GIMPLE_CATCH: | |
8018 | c_warn_unused_result (gimple_catch_handler (g)); | |
8019 | break; | |
8020 | case GIMPLE_EH_FILTER: | |
8021 | c_warn_unused_result (gimple_eh_filter_failure (g)); | |
8022 | break; | |
4ee9c684 | 8023 | |
75a70cf9 | 8024 | case GIMPLE_CALL: |
8025 | if (gimple_call_lhs (g)) | |
8026 | break; | |
8027 | ||
8028 | /* This is a naked call, as opposed to a GIMPLE_CALL with an | |
8029 | LHS. All calls whose value is ignored should be | |
8030 | represented like this. Look for the attribute. */ | |
0acacf9e | 8031 | fdecl = gimple_call_fndecl (g); |
8032 | ftype = TREE_TYPE (TREE_TYPE (gimple_call_fn (g))); | |
4ee9c684 | 8033 | |
75a70cf9 | 8034 | if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype))) |
8035 | { | |
8036 | location_t loc = gimple_location (g); | |
8037 | ||
8038 | if (fdecl) | |
8039 | warning (0, "%Hignoring return value of %qD, " | |
8040 | "declared with attribute warn_unused_result", | |
8041 | &loc, fdecl); | |
8042 | else | |
8043 | warning (0, "%Hignoring return value of function " | |
8044 | "declared with attribute warn_unused_result", | |
8045 | &loc); | |
8046 | } | |
8047 | break; | |
8048 | ||
8049 | default: | |
8050 | /* Not a container, not a call, or a call whose value is used. */ | |
8051 | break; | |
8052 | } | |
4ee9c684 | 8053 | } |
8054 | } | |
8055 | ||
624d37a6 | 8056 | /* Convert a character from the host to the target execution character |
8057 | set. cpplib handles this, mostly. */ | |
8058 | ||
8059 | HOST_WIDE_INT | |
8060 | c_common_to_target_charset (HOST_WIDE_INT c) | |
8061 | { | |
8062 | /* Character constants in GCC proper are sign-extended under -fsigned-char, | |
8063 | zero-extended under -fno-signed-char. cpplib insists that characters | |
8064 | and character constants are always unsigned. Hence we must convert | |
8065 | back and forth. */ | |
8066 | cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1); | |
8067 | ||
8068 | uc = cpp_host_to_exec_charset (parse_in, uc); | |
8069 | ||
8070 | if (flag_signed_char) | |
8071 | return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE) | |
8072 | >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE); | |
8073 | else | |
8074 | return uc; | |
8075 | } | |
8076 | ||
af28855b | 8077 | /* Build the result of __builtin_offsetof. EXPR is a nested sequence of |
d897f7c2 | 8078 | component references, with STOP_REF, or alternatively an INDIRECT_REF of |
8079 | NULL, at the bottom; much like the traditional rendering of offsetof as a | |
8080 | macro. Returns the folded and properly cast result. */ | |
af28855b | 8081 | |
8082 | static tree | |
d897f7c2 | 8083 | fold_offsetof_1 (tree expr, tree stop_ref) |
af28855b | 8084 | { |
8085 | enum tree_code code = PLUS_EXPR; | |
8086 | tree base, off, t; | |
8087 | ||
d897f7c2 | 8088 | if (expr == stop_ref && TREE_CODE (expr) != ERROR_MARK) |
8089 | return size_zero_node; | |
8090 | ||
af28855b | 8091 | switch (TREE_CODE (expr)) |
8092 | { | |
8093 | case ERROR_MARK: | |
8094 | return expr; | |
8095 | ||
6b11d2e3 | 8096 | case VAR_DECL: |
8097 | error ("cannot apply %<offsetof%> to static data member %qD", expr); | |
8098 | return error_mark_node; | |
8099 | ||
d897f7c2 | 8100 | case CALL_EXPR: |
cf1a89a3 | 8101 | case TARGET_EXPR: |
d897f7c2 | 8102 | error ("cannot apply %<offsetof%> when %<operator[]%> is overloaded"); |
8103 | return error_mark_node; | |
8104 | ||
8105 | case INTEGER_CST: | |
8106 | gcc_assert (integer_zerop (expr)); | |
af28855b | 8107 | return size_zero_node; |
8108 | ||
d897f7c2 | 8109 | case NOP_EXPR: |
8110 | case INDIRECT_REF: | |
8111 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); | |
8112 | gcc_assert (base == error_mark_node || base == size_zero_node); | |
8113 | return base; | |
8114 | ||
af28855b | 8115 | case COMPONENT_REF: |
d897f7c2 | 8116 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); |
af28855b | 8117 | if (base == error_mark_node) |
8118 | return base; | |
8119 | ||
8120 | t = TREE_OPERAND (expr, 1); | |
8121 | if (DECL_C_BIT_FIELD (t)) | |
8122 | { | |
8123 | error ("attempt to take address of bit-field structure " | |
782858b8 | 8124 | "member %qD", t); |
af28855b | 8125 | return error_mark_node; |
8126 | } | |
8127 | off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t), | |
8128 | size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1) | |
8129 | / BITS_PER_UNIT)); | |
8130 | break; | |
8131 | ||
8132 | case ARRAY_REF: | |
d897f7c2 | 8133 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); |
af28855b | 8134 | if (base == error_mark_node) |
8135 | return base; | |
8136 | ||
8137 | t = TREE_OPERAND (expr, 1); | |
8138 | if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0) | |
8139 | { | |
8140 | code = MINUS_EXPR; | |
49d00087 | 8141 | t = fold_build1 (NEGATE_EXPR, TREE_TYPE (t), t); |
af28855b | 8142 | } |
8143 | t = convert (sizetype, t); | |
8144 | off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t); | |
8145 | break; | |
8146 | ||
ede90cc2 | 8147 | case COMPOUND_EXPR: |
8148 | /* Handle static members of volatile structs. */ | |
8149 | t = TREE_OPERAND (expr, 1); | |
8150 | gcc_assert (TREE_CODE (t) == VAR_DECL); | |
8151 | return fold_offsetof_1 (t, stop_ref); | |
8152 | ||
af28855b | 8153 | default: |
231bd014 | 8154 | gcc_unreachable (); |
af28855b | 8155 | } |
8156 | ||
8157 | return size_binop (code, base, off); | |
8158 | } | |
8159 | ||
8160 | tree | |
d897f7c2 | 8161 | fold_offsetof (tree expr, tree stop_ref) |
af28855b | 8162 | { |
8163 | /* Convert back from the internal sizetype to size_t. */ | |
d897f7c2 | 8164 | return convert (size_type_node, fold_offsetof_1 (expr, stop_ref)); |
af28855b | 8165 | } |
8166 | ||
e35976b1 | 8167 | /* Print an error message for an invalid lvalue. USE says |
ab6bb714 | 8168 | how the lvalue is being used and so selects the error message. */ |
8169 | ||
e35976b1 | 8170 | void |
8171 | lvalue_error (enum lvalue_use use) | |
ab6bb714 | 8172 | { |
e35976b1 | 8173 | switch (use) |
ab6bb714 | 8174 | { |
e35976b1 | 8175 | case lv_assign: |
82d76a54 | 8176 | error ("lvalue required as left operand of assignment"); |
e35976b1 | 8177 | break; |
8178 | case lv_increment: | |
82d76a54 | 8179 | error ("lvalue required as increment operand"); |
e35976b1 | 8180 | break; |
8181 | case lv_decrement: | |
82d76a54 | 8182 | error ("lvalue required as decrement operand"); |
e35976b1 | 8183 | break; |
8184 | case lv_addressof: | |
82d76a54 | 8185 | error ("lvalue required as unary %<&%> operand"); |
e35976b1 | 8186 | break; |
8187 | case lv_asm: | |
82d76a54 | 8188 | error ("lvalue required in asm statement"); |
e35976b1 | 8189 | break; |
8190 | default: | |
8191 | gcc_unreachable (); | |
ab6bb714 | 8192 | } |
ab6bb714 | 8193 | } |
c271bdb2 | 8194 | \f |
8195 | /* *PTYPE is an incomplete array. Complete it with a domain based on | |
8196 | INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT | |
8197 | is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, | |
8198 | 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */ | |
8199 | ||
8200 | int | |
8201 | complete_array_type (tree *ptype, tree initial_value, bool do_default) | |
8202 | { | |
8203 | tree maxindex, type, main_type, elt, unqual_elt; | |
8204 | int failure = 0, quals; | |
6753bca0 | 8205 | hashval_t hashcode = 0; |
c271bdb2 | 8206 | |
8207 | maxindex = size_zero_node; | |
8208 | if (initial_value) | |
8209 | { | |
8210 | if (TREE_CODE (initial_value) == STRING_CST) | |
8211 | { | |
8212 | int eltsize | |
8213 | = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
8214 | maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1); | |
8215 | } | |
8216 | else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
8217 | { | |
c75b4594 | 8218 | VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value); |
c271bdb2 | 8219 | |
c75b4594 | 8220 | if (VEC_empty (constructor_elt, v)) |
c271bdb2 | 8221 | { |
8222 | if (pedantic) | |
8223 | failure = 3; | |
8224 | maxindex = integer_minus_one_node; | |
8225 | } | |
8226 | else | |
8227 | { | |
8228 | tree curindex; | |
c75b4594 | 8229 | unsigned HOST_WIDE_INT cnt; |
8230 | constructor_elt *ce; | |
cee43f7e | 8231 | bool fold_p = false; |
c271bdb2 | 8232 | |
c75b4594 | 8233 | if (VEC_index (constructor_elt, v, 0)->index) |
8234 | maxindex = fold_convert (sizetype, | |
8235 | VEC_index (constructor_elt, | |
8236 | v, 0)->index); | |
c271bdb2 | 8237 | curindex = maxindex; |
8238 | ||
c75b4594 | 8239 | for (cnt = 1; |
8240 | VEC_iterate (constructor_elt, v, cnt, ce); | |
8241 | cnt++) | |
c271bdb2 | 8242 | { |
cee43f7e | 8243 | bool curfold_p = false; |
c75b4594 | 8244 | if (ce->index) |
cee43f7e | 8245 | curindex = ce->index, curfold_p = true; |
c271bdb2 | 8246 | else |
cee43f7e | 8247 | { |
8248 | if (fold_p) | |
8249 | curindex = fold_convert (sizetype, curindex); | |
8250 | curindex = size_binop (PLUS_EXPR, curindex, size_one_node); | |
8251 | } | |
c271bdb2 | 8252 | if (tree_int_cst_lt (maxindex, curindex)) |
cee43f7e | 8253 | maxindex = curindex, fold_p = curfold_p; |
c271bdb2 | 8254 | } |
cee43f7e | 8255 | if (fold_p) |
8256 | maxindex = fold_convert (sizetype, maxindex); | |
c271bdb2 | 8257 | } |
8258 | } | |
8259 | else | |
8260 | { | |
8261 | /* Make an error message unless that happened already. */ | |
8262 | if (initial_value != error_mark_node) | |
8263 | failure = 1; | |
8264 | } | |
8265 | } | |
8266 | else | |
8267 | { | |
8268 | failure = 2; | |
8269 | if (!do_default) | |
8270 | return failure; | |
8271 | } | |
8272 | ||
8273 | type = *ptype; | |
8274 | elt = TREE_TYPE (type); | |
8275 | quals = TYPE_QUALS (strip_array_types (elt)); | |
8276 | if (quals == 0) | |
8277 | unqual_elt = elt; | |
8278 | else | |
8279 | unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED); | |
8280 | ||
8281 | /* Using build_distinct_type_copy and modifying things afterward instead | |
8282 | of using build_array_type to create a new type preserves all of the | |
8283 | TYPE_LANG_FLAG_? bits that the front end may have set. */ | |
8284 | main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
8285 | TREE_TYPE (main_type) = unqual_elt; | |
8286 | TYPE_DOMAIN (main_type) = build_index_type (maxindex); | |
8287 | layout_type (main_type); | |
8288 | ||
6753bca0 | 8289 | /* Make sure we have the canonical MAIN_TYPE. */ |
8290 | hashcode = iterative_hash_object (TYPE_HASH (unqual_elt), hashcode); | |
8291 | hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (main_type)), | |
8292 | hashcode); | |
8293 | main_type = type_hash_canon (hashcode, main_type); | |
8294 | ||
796735dc | 8295 | /* Fix the canonical type. */ |
8296 | if (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (main_type)) | |
8297 | || TYPE_STRUCTURAL_EQUALITY_P (TYPE_DOMAIN (main_type))) | |
8298 | SET_TYPE_STRUCTURAL_EQUALITY (main_type); | |
8299 | else if (TYPE_CANONICAL (TREE_TYPE (main_type)) != TREE_TYPE (main_type) | |
8300 | || (TYPE_CANONICAL (TYPE_DOMAIN (main_type)) | |
8301 | != TYPE_DOMAIN (main_type))) | |
8302 | TYPE_CANONICAL (main_type) | |
8303 | = build_array_type (TYPE_CANONICAL (TREE_TYPE (main_type)), | |
8304 | TYPE_CANONICAL (TYPE_DOMAIN (main_type))); | |
8305 | else | |
8306 | TYPE_CANONICAL (main_type) = main_type; | |
8307 | ||
c271bdb2 | 8308 | if (quals == 0) |
8309 | type = main_type; | |
8310 | else | |
8311 | type = c_build_qualified_type (main_type, quals); | |
8312 | ||
4f5b8f2a | 8313 | if (COMPLETE_TYPE_P (type) |
8314 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST | |
8315 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) | |
8316 | { | |
8317 | error ("size of array is too large"); | |
8318 | /* If we proceed with the array type as it is, we'll eventually | |
8319 | crash in tree_low_cst(). */ | |
8320 | type = error_mark_node; | |
8321 | } | |
8322 | ||
c271bdb2 | 8323 | *ptype = type; |
8324 | return failure; | |
8325 | } | |
ab6bb714 | 8326 | |
b6a5fc45 | 8327 | \f |
8328 | /* Used to help initialize the builtin-types.def table. When a type of | |
8329 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
8330 | The later results in segfaults even when a decl using the type doesn't | |
8331 | get invoked. */ | |
8332 | ||
8333 | tree | |
8334 | builtin_type_for_size (int size, bool unsignedp) | |
8335 | { | |
8336 | tree type = lang_hooks.types.type_for_size (size, unsignedp); | |
8337 | return type ? type : error_mark_node; | |
8338 | } | |
8339 | ||
8340 | /* A helper function for resolve_overloaded_builtin in resolving the | |
8341 | overloaded __sync_ builtins. Returns a positive power of 2 if the | |
8342 | first operand of PARAMS is a pointer to a supported data type. | |
8343 | Returns 0 if an error is encountered. */ | |
8344 | ||
8345 | static int | |
8346 | sync_resolve_size (tree function, tree params) | |
8347 | { | |
8348 | tree type; | |
8349 | int size; | |
8350 | ||
8351 | if (params == NULL) | |
8352 | { | |
8353 | error ("too few arguments to function %qE", function); | |
8354 | return 0; | |
8355 | } | |
8356 | ||
8357 | type = TREE_TYPE (TREE_VALUE (params)); | |
8358 | if (TREE_CODE (type) != POINTER_TYPE) | |
8359 | goto incompatible; | |
8360 | ||
8361 | type = TREE_TYPE (type); | |
8362 | if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type)) | |
8363 | goto incompatible; | |
8364 | ||
8365 | size = tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
27213ba3 | 8366 | if (size == 1 || size == 2 || size == 4 || size == 8 || size == 16) |
b6a5fc45 | 8367 | return size; |
8368 | ||
8369 | incompatible: | |
8370 | error ("incompatible type for argument %d of %qE", 1, function); | |
8371 | return 0; | |
8372 | } | |
8373 | ||
a0c938f0 | 8374 | /* A helper function for resolve_overloaded_builtin. Adds casts to |
b6a5fc45 | 8375 | PARAMS to make arguments match up with those of FUNCTION. Drops |
8376 | the variadic arguments at the end. Returns false if some error | |
8377 | was encountered; true on success. */ | |
8378 | ||
8379 | static bool | |
8380 | sync_resolve_params (tree orig_function, tree function, tree params) | |
8381 | { | |
8382 | tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function)); | |
8383 | tree ptype; | |
8384 | int number; | |
8385 | ||
8386 | /* We've declared the implementation functions to use "volatile void *" | |
8387 | as the pointer parameter, so we shouldn't get any complaints from the | |
8388 | call to check_function_arguments what ever type the user used. */ | |
8389 | arg_types = TREE_CHAIN (arg_types); | |
8390 | ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
8391 | number = 2; | |
8392 | ||
8393 | /* For the rest of the values, we need to cast these to FTYPE, so that we | |
8394 | don't get warnings for passing pointer types, etc. */ | |
8395 | while (arg_types != void_list_node) | |
8396 | { | |
8397 | tree val; | |
8398 | ||
8399 | params = TREE_CHAIN (params); | |
8400 | if (params == NULL) | |
8401 | { | |
8402 | error ("too few arguments to function %qE", orig_function); | |
8403 | return false; | |
8404 | } | |
8405 | ||
8406 | /* ??? Ideally for the first conversion we'd use convert_for_assignment | |
8407 | so that we get warnings for anything that doesn't match the pointer | |
8408 | type. This isn't portable across the C and C++ front ends atm. */ | |
8409 | val = TREE_VALUE (params); | |
8410 | val = convert (ptype, val); | |
8411 | val = convert (TREE_VALUE (arg_types), val); | |
8412 | TREE_VALUE (params) = val; | |
8413 | ||
8414 | arg_types = TREE_CHAIN (arg_types); | |
8415 | number++; | |
8416 | } | |
8417 | ||
8418 | /* The definition of these primitives is variadic, with the remaining | |
8419 | being "an optional list of variables protected by the memory barrier". | |
8420 | No clue what that's supposed to mean, precisely, but we consider all | |
8421 | call-clobbered variables to be protected so we're safe. */ | |
8422 | TREE_CHAIN (params) = NULL; | |
8423 | ||
8424 | return true; | |
8425 | } | |
8426 | ||
a0c938f0 | 8427 | /* A helper function for resolve_overloaded_builtin. Adds a cast to |
b6a5fc45 | 8428 | RESULT to make it match the type of the first pointer argument in |
8429 | PARAMS. */ | |
8430 | ||
8431 | static tree | |
8432 | sync_resolve_return (tree params, tree result) | |
8433 | { | |
8434 | tree ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
10080eac | 8435 | ptype = TYPE_MAIN_VARIANT (ptype); |
b6a5fc45 | 8436 | return convert (ptype, result); |
8437 | } | |
8438 | ||
8439 | /* Some builtin functions are placeholders for other expressions. This | |
8440 | function should be called immediately after parsing the call expression | |
8441 | before surrounding code has committed to the type of the expression. | |
8442 | ||
8443 | FUNCTION is the DECL that has been invoked; it is known to be a builtin. | |
8444 | PARAMS is the argument list for the call. The return value is non-null | |
8445 | when expansion is complete, and null if normal processing should | |
8446 | continue. */ | |
8447 | ||
8448 | tree | |
8449 | resolve_overloaded_builtin (tree function, tree params) | |
8450 | { | |
8451 | enum built_in_function orig_code = DECL_FUNCTION_CODE (function); | |
65441f6f | 8452 | switch (DECL_BUILT_IN_CLASS (function)) |
8453 | { | |
8454 | case BUILT_IN_NORMAL: | |
8455 | break; | |
8456 | case BUILT_IN_MD: | |
8457 | if (targetm.resolve_overloaded_builtin) | |
a0c938f0 | 8458 | return targetm.resolve_overloaded_builtin (function, params); |
65441f6f | 8459 | else |
a0c938f0 | 8460 | return NULL_TREE; |
65441f6f | 8461 | default: |
8462 | return NULL_TREE; | |
8463 | } | |
a0c938f0 | 8464 | |
65441f6f | 8465 | /* Handle BUILT_IN_NORMAL here. */ |
b6a5fc45 | 8466 | switch (orig_code) |
8467 | { | |
8468 | case BUILT_IN_FETCH_AND_ADD_N: | |
8469 | case BUILT_IN_FETCH_AND_SUB_N: | |
8470 | case BUILT_IN_FETCH_AND_OR_N: | |
8471 | case BUILT_IN_FETCH_AND_AND_N: | |
8472 | case BUILT_IN_FETCH_AND_XOR_N: | |
8473 | case BUILT_IN_FETCH_AND_NAND_N: | |
8474 | case BUILT_IN_ADD_AND_FETCH_N: | |
8475 | case BUILT_IN_SUB_AND_FETCH_N: | |
8476 | case BUILT_IN_OR_AND_FETCH_N: | |
8477 | case BUILT_IN_AND_AND_FETCH_N: | |
8478 | case BUILT_IN_XOR_AND_FETCH_N: | |
8479 | case BUILT_IN_NAND_AND_FETCH_N: | |
8480 | case BUILT_IN_BOOL_COMPARE_AND_SWAP_N: | |
8481 | case BUILT_IN_VAL_COMPARE_AND_SWAP_N: | |
8482 | case BUILT_IN_LOCK_TEST_AND_SET_N: | |
8483 | case BUILT_IN_LOCK_RELEASE_N: | |
8484 | { | |
8485 | int n = sync_resolve_size (function, params); | |
8486 | tree new_function, result; | |
8487 | ||
8488 | if (n == 0) | |
8489 | return error_mark_node; | |
8490 | ||
8491 | new_function = built_in_decls[orig_code + exact_log2 (n) + 1]; | |
8492 | if (!sync_resolve_params (function, new_function, params)) | |
8493 | return error_mark_node; | |
8494 | ||
8495 | result = build_function_call (new_function, params); | |
8496 | if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N | |
8497 | && orig_code != BUILT_IN_LOCK_RELEASE_N) | |
8498 | result = sync_resolve_return (params, result); | |
8499 | ||
8500 | return result; | |
8501 | } | |
8502 | ||
8503 | default: | |
65441f6f | 8504 | return NULL_TREE; |
b6a5fc45 | 8505 | } |
8506 | } | |
8507 | ||
491255f5 | 8508 | /* Ignoring their sign, return true if two scalar types are the same. */ |
8509 | bool | |
8510 | same_scalar_type_ignoring_signedness (tree t1, tree t2) | |
8511 | { | |
8512 | enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2); | |
8513 | ||
9421ebb9 | 8514 | gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE || c1 == FIXED_POINT_TYPE) |
8515 | && (c2 == INTEGER_TYPE || c2 == REAL_TYPE | |
8516 | || c2 == FIXED_POINT_TYPE)); | |
491255f5 | 8517 | |
8518 | /* Equality works here because c_common_signed_type uses | |
8519 | TYPE_MAIN_VARIANT. */ | |
11773141 | 8520 | return c_common_signed_type (t1) |
8521 | == c_common_signed_type (t2); | |
491255f5 | 8522 | } |
8523 | ||
be7350e7 | 8524 | /* Check for missing format attributes on function pointers. LTYPE is |
8525 | the new type or left-hand side type. RTYPE is the old type or | |
8526 | right-hand side type. Returns TRUE if LTYPE is missing the desired | |
8527 | attribute. */ | |
8528 | ||
8529 | bool | |
8530 | check_missing_format_attribute (tree ltype, tree rtype) | |
8531 | { | |
8532 | tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype); | |
8533 | tree ra; | |
8534 | ||
8535 | for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra)) | |
8536 | if (is_attribute_p ("format", TREE_PURPOSE (ra))) | |
8537 | break; | |
8538 | if (ra) | |
8539 | { | |
8540 | tree la; | |
8541 | for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la)) | |
8542 | if (is_attribute_p ("format", TREE_PURPOSE (la))) | |
8543 | break; | |
8544 | return !la; | |
8545 | } | |
8546 | else | |
8547 | return false; | |
8548 | } | |
8549 | ||
2840aae4 | 8550 | /* Subscripting with type char is likely to lose on a machine where |
8551 | chars are signed. So warn on any machine, but optionally. Don't | |
8552 | warn for unsigned char since that type is safe. Don't warn for | |
8553 | signed char because anyone who uses that must have done so | |
8554 | deliberately. Furthermore, we reduce the false positive load by | |
8555 | warning only for non-constant value of type char. */ | |
8556 | ||
8557 | void | |
8558 | warn_array_subscript_with_type_char (tree index) | |
8559 | { | |
8560 | if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node | |
8561 | && TREE_CODE (index) != INTEGER_CST) | |
8562 | warning (OPT_Wchar_subscripts, "array subscript has type %<char%>"); | |
8563 | } | |
8564 | ||
e534436e | 8565 | /* Implement -Wparentheses for the unexpected C precedence rules, to |
8566 | cover cases like x + y << z which readers are likely to | |
8567 | misinterpret. We have seen an expression in which CODE is a binary | |
82012ffe | 8568 | operator used to combine expressions ARG_LEFT and ARG_RIGHT, which |
8569 | before folding had CODE_LEFT and CODE_RIGHT. CODE_LEFT and | |
8570 | CODE_RIGHT may be ERROR_MARK, which means that that side of the | |
8571 | expression was not formed using a binary or unary operator, or it | |
8572 | was enclosed in parentheses. */ | |
e534436e | 8573 | |
8574 | void | |
82012ffe | 8575 | warn_about_parentheses (enum tree_code code, |
269f7979 | 8576 | enum tree_code code_left, tree arg_left, |
82012ffe | 8577 | enum tree_code code_right, tree arg_right) |
e534436e | 8578 | { |
8579 | if (!warn_parentheses) | |
8580 | return; | |
8581 | ||
82012ffe | 8582 | /* This macro tests that the expression ARG with original tree code |
8583 | CODE appears to be a boolean expression. or the result of folding a | |
8584 | boolean expression. */ | |
8585 | #define APPEARS_TO_BE_BOOLEAN_EXPR_P(CODE, ARG) \ | |
8586 | (truth_value_p (TREE_CODE (ARG)) \ | |
8587 | || TREE_CODE (TREE_TYPE (ARG)) == BOOLEAN_TYPE \ | |
8588 | /* Folding may create 0 or 1 integers from other expressions. */ \ | |
8589 | || ((CODE) != INTEGER_CST \ | |
8590 | && (integer_onep (ARG) || integer_zerop (ARG)))) | |
8591 | ||
8592 | switch (code) | |
e534436e | 8593 | { |
82012ffe | 8594 | case LSHIFT_EXPR: |
8595 | if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
e534436e | 8596 | warning (OPT_Wparentheses, |
82012ffe | 8597 | "suggest parentheses around %<+%> inside %<<<%>"); |
8598 | else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
8599 | warning (OPT_Wparentheses, | |
8600 | "suggest parentheses around %<-%> inside %<<<%>"); | |
8601 | return; | |
e534436e | 8602 | |
82012ffe | 8603 | case RSHIFT_EXPR: |
8604 | if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
e534436e | 8605 | warning (OPT_Wparentheses, |
82012ffe | 8606 | "suggest parentheses around %<+%> inside %<>>%>"); |
8607 | else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
8608 | warning (OPT_Wparentheses, | |
8609 | "suggest parentheses around %<-%> inside %<>>%>"); | |
8610 | return; | |
e534436e | 8611 | |
82012ffe | 8612 | case TRUTH_ORIF_EXPR: |
8613 | if (code_left == TRUTH_ANDIF_EXPR || code_right == TRUTH_ANDIF_EXPR) | |
8614 | warning (OPT_Wparentheses, | |
8615 | "suggest parentheses around %<&&%> within %<||%>"); | |
8616 | return; | |
8617 | ||
8618 | case BIT_IOR_EXPR: | |
e534436e | 8619 | if (code_left == BIT_AND_EXPR || code_left == BIT_XOR_EXPR |
8620 | || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
8621 | || code_right == BIT_AND_EXPR || code_right == BIT_XOR_EXPR | |
8622 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
8623 | warning (OPT_Wparentheses, | |
82012ffe | 8624 | "suggest parentheses around arithmetic in operand of %<|%>"); |
e534436e | 8625 | /* Check cases like x|y==z */ |
82012ffe | 8626 | else if (TREE_CODE_CLASS (code_left) == tcc_comparison |
8627 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
e534436e | 8628 | warning (OPT_Wparentheses, |
82012ffe | 8629 | "suggest parentheses around comparison in operand of %<|%>"); |
8630 | /* Check cases like !x | y */ | |
8631 | else if (code_left == TRUTH_NOT_EXPR | |
8632 | && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right)) | |
96bda40f | 8633 | warning (OPT_Wparentheses, "suggest parentheses around operand of " |
82012ffe | 8634 | "%<!%> or change %<|%> to %<||%> or %<!%> to %<~%>"); |
8635 | return; | |
e534436e | 8636 | |
82012ffe | 8637 | case BIT_XOR_EXPR: |
e534436e | 8638 | if (code_left == BIT_AND_EXPR |
8639 | || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
8640 | || code_right == BIT_AND_EXPR | |
8641 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
8642 | warning (OPT_Wparentheses, | |
82012ffe | 8643 | "suggest parentheses around arithmetic in operand of %<^%>"); |
e534436e | 8644 | /* Check cases like x^y==z */ |
82012ffe | 8645 | else if (TREE_CODE_CLASS (code_left) == tcc_comparison |
8646 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
e534436e | 8647 | warning (OPT_Wparentheses, |
82012ffe | 8648 | "suggest parentheses around comparison in operand of %<^%>"); |
8649 | return; | |
e534436e | 8650 | |
82012ffe | 8651 | case BIT_AND_EXPR: |
8652 | if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
8653 | warning (OPT_Wparentheses, | |
8654 | "suggest parentheses around %<+%> in operand of %<&%>"); | |
8655 | else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
e534436e | 8656 | warning (OPT_Wparentheses, |
82012ffe | 8657 | "suggest parentheses around %<-%> in operand of %<&%>"); |
e534436e | 8658 | /* Check cases like x&y==z */ |
82012ffe | 8659 | else if (TREE_CODE_CLASS (code_left) == tcc_comparison |
8660 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
e534436e | 8661 | warning (OPT_Wparentheses, |
82012ffe | 8662 | "suggest parentheses around comparison in operand of %<&%>"); |
8663 | /* Check cases like !x & y */ | |
8664 | else if (code_left == TRUTH_NOT_EXPR | |
8665 | && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right)) | |
96bda40f | 8666 | warning (OPT_Wparentheses, "suggest parentheses around operand of " |
82012ffe | 8667 | "%<!%> or change %<&%> to %<&&%> or %<!%> to %<~%>"); |
8668 | return; | |
e534436e | 8669 | |
82012ffe | 8670 | case EQ_EXPR: |
6ce0c450 | 8671 | if (TREE_CODE_CLASS (code_left) == tcc_comparison |
8672 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
8673 | warning (OPT_Wparentheses, | |
82012ffe | 8674 | "suggest parentheses around comparison in operand of %<==%>"); |
8675 | return; | |
8676 | case NE_EXPR: | |
8677 | if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
8678 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
8679 | warning (OPT_Wparentheses, | |
8680 | "suggest parentheses around comparison in operand of %<!=%>"); | |
8681 | return; | |
8682 | ||
8683 | default: | |
8684 | if (TREE_CODE_CLASS (code) == tcc_comparison | |
8685 | && ((TREE_CODE_CLASS (code_left) == tcc_comparison | |
269f7979 | 8686 | && code_left != NE_EXPR && code_left != EQ_EXPR |
8687 | && INTEGRAL_TYPE_P (TREE_TYPE (arg_left))) | |
82012ffe | 8688 | || (TREE_CODE_CLASS (code_right) == tcc_comparison |
269f7979 | 8689 | && code_right != NE_EXPR && code_right != EQ_EXPR |
8690 | && INTEGRAL_TYPE_P (TREE_TYPE (arg_right))))) | |
82012ffe | 8691 | warning (OPT_Wparentheses, "comparisons like %<X<=Y<=Z%> do not " |
6ce0c450 | 8692 | "have their mathematical meaning"); |
82012ffe | 8693 | return; |
6ce0c450 | 8694 | } |
82012ffe | 8695 | #undef NOT_A_BOOLEAN_EXPR_P |
e534436e | 8696 | } |
8697 | ||
92fccaaa | 8698 | /* If LABEL (a LABEL_DECL) has not been used, issue a warning. */ |
8699 | ||
8700 | void | |
8701 | warn_for_unused_label (tree label) | |
8702 | { | |
8703 | if (!TREE_USED (label)) | |
8704 | { | |
8705 | if (DECL_INITIAL (label)) | |
8706 | warning (OPT_Wunused_label, "label %q+D defined but not used", label); | |
8707 | else | |
8708 | warning (OPT_Wunused_label, "label %q+D declared but not defined", label); | |
8709 | } | |
8710 | } | |
2840aae4 | 8711 | |
b9fc964a | 8712 | #ifndef TARGET_HAS_TARGETCM |
8713 | struct gcc_targetcm targetcm = TARGETCM_INITIALIZER; | |
8714 | #endif | |
8715 | ||
b6889cb0 | 8716 | /* Warn for division by zero according to the value of DIVISOR. LOC |
8717 | is the location of the division operator. */ | |
f092582b | 8718 | |
8719 | void | |
b6889cb0 | 8720 | warn_for_div_by_zero (location_t loc, tree divisor) |
f092582b | 8721 | { |
9421ebb9 | 8722 | /* If DIVISOR is zero, and has integral or fixed-point type, issue a warning |
8723 | about division by zero. Do not issue a warning if DIVISOR has a | |
f092582b | 8724 | floating-point type, since we consider 0.0/0.0 a valid way of |
8725 | generating a NaN. */ | |
9421ebb9 | 8726 | if (skip_evaluation == 0 |
8727 | && (integer_zerop (divisor) || fixed_zerop (divisor))) | |
b6889cb0 | 8728 | warning_at (loc, OPT_Wdiv_by_zero, "division by zero"); |
f092582b | 8729 | } |
8730 | ||
13869a99 | 8731 | /* Subroutine of build_binary_op. Give warnings for comparisons |
8732 | between signed and unsigned quantities that may fail. Do the | |
8733 | checking based on the original operand trees ORIG_OP0 and ORIG_OP1, | |
8734 | so that casts will be considered, but default promotions won't | |
8e70fb09 | 8735 | be. |
8736 | ||
8737 | LOCATION is the location of the comparison operator. | |
13869a99 | 8738 | |
8739 | The arguments of this function map directly to local variables | |
8740 | of build_binary_op. */ | |
8741 | ||
8742 | void | |
8e70fb09 | 8743 | warn_for_sign_compare (location_t location, |
8744 | tree orig_op0, tree orig_op1, | |
13869a99 | 8745 | tree op0, tree op1, |
8746 | tree result_type, enum tree_code resultcode) | |
8747 | { | |
8748 | int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0)); | |
8749 | int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1)); | |
8750 | int unsignedp0, unsignedp1; | |
8751 | ||
8752 | /* In C++, check for comparison of different enum types. */ | |
8753 | if (c_dialect_cxx() | |
8754 | && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE | |
8755 | && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE | |
8756 | && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0)) | |
895b662f | 8757 | != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1))) |
13869a99 | 8758 | { |
8e70fb09 | 8759 | warning_at (location, |
8760 | OPT_Wsign_compare, "comparison between types %qT and %qT", | |
8761 | TREE_TYPE (orig_op0), TREE_TYPE (orig_op1)); | |
13869a99 | 8762 | } |
8763 | ||
8764 | /* Do not warn if the comparison is being done in a signed type, | |
8765 | since the signed type will only be chosen if it can represent | |
8766 | all the values of the unsigned type. */ | |
8767 | if (!TYPE_UNSIGNED (result_type)) | |
8768 | /* OK */; | |
8769 | /* Do not warn if both operands are unsigned. */ | |
8770 | else if (op0_signed == op1_signed) | |
8771 | /* OK */; | |
8772 | else | |
8773 | { | |
895b662f | 8774 | tree sop, uop, base_type; |
13869a99 | 8775 | bool ovf; |
895b662f | 8776 | |
13869a99 | 8777 | if (op0_signed) |
8778 | sop = orig_op0, uop = orig_op1; | |
8779 | else | |
8780 | sop = orig_op1, uop = orig_op0; | |
8781 | ||
8782 | STRIP_TYPE_NOPS (sop); | |
8783 | STRIP_TYPE_NOPS (uop); | |
895b662f | 8784 | base_type = (TREE_CODE (result_type) == COMPLEX_TYPE |
8785 | ? TREE_TYPE (result_type) : result_type); | |
13869a99 | 8786 | |
8787 | /* Do not warn if the signed quantity is an unsuffixed integer | |
8788 | literal (or some static constant expression involving such | |
8789 | literals or a conditional expression involving such literals) | |
8790 | and it is non-negative. */ | |
8791 | if (tree_expr_nonnegative_warnv_p (sop, &ovf)) | |
8792 | /* OK */; | |
8793 | /* Do not warn if the comparison is an equality operation, the | |
8794 | unsigned quantity is an integral constant, and it would fit | |
8795 | in the result if the result were signed. */ | |
8796 | else if (TREE_CODE (uop) == INTEGER_CST | |
8797 | && (resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
895b662f | 8798 | && int_fits_type_p (uop, c_common_signed_type (base_type))) |
13869a99 | 8799 | /* OK */; |
8800 | /* In C, do not warn if the unsigned quantity is an enumeration | |
8801 | constant and its maximum value would fit in the result if the | |
8802 | result were signed. */ | |
8803 | else if (!c_dialect_cxx() && TREE_CODE (uop) == INTEGER_CST | |
8804 | && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE | |
8805 | && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (uop)), | |
895b662f | 8806 | c_common_signed_type (base_type))) |
13869a99 | 8807 | /* OK */; |
8808 | else | |
8e70fb09 | 8809 | warning_at (location, |
8810 | OPT_Wsign_compare, | |
8811 | "comparison between signed and unsigned integer expressions"); | |
13869a99 | 8812 | } |
8813 | ||
8814 | /* Warn if two unsigned values are being compared in a size larger | |
8815 | than their original size, and one (and only one) is the result of | |
8816 | a `~' operator. This comparison will always fail. | |
8817 | ||
8818 | Also warn if one operand is a constant, and the constant does not | |
8819 | have all bits set that are set in the ~ operand when it is | |
8820 | extended. */ | |
8821 | ||
8822 | op0 = get_narrower (op0, &unsignedp0); | |
8823 | op1 = get_narrower (op1, &unsignedp1); | |
8824 | ||
8825 | if ((TREE_CODE (op0) == BIT_NOT_EXPR) | |
8826 | ^ (TREE_CODE (op1) == BIT_NOT_EXPR)) | |
8827 | { | |
8828 | if (TREE_CODE (op0) == BIT_NOT_EXPR) | |
8829 | op0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); | |
8830 | if (TREE_CODE (op1) == BIT_NOT_EXPR) | |
8831 | op1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); | |
8832 | ||
8833 | if (host_integerp (op0, 0) || host_integerp (op1, 0)) | |
8834 | { | |
8835 | tree primop; | |
8836 | HOST_WIDE_INT constant, mask; | |
8837 | int unsignedp; | |
8838 | unsigned int bits; | |
8839 | ||
8840 | if (host_integerp (op0, 0)) | |
8841 | { | |
8842 | primop = op1; | |
8843 | unsignedp = unsignedp1; | |
8844 | constant = tree_low_cst (op0, 0); | |
8845 | } | |
8846 | else | |
8847 | { | |
8848 | primop = op0; | |
8849 | unsignedp = unsignedp0; | |
8850 | constant = tree_low_cst (op1, 0); | |
8851 | } | |
8852 | ||
8853 | bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
8854 | if (bits < TYPE_PRECISION (result_type) | |
8855 | && bits < HOST_BITS_PER_LONG && unsignedp) | |
8856 | { | |
8857 | mask = (~ (HOST_WIDE_INT) 0) << bits; | |
8858 | if ((mask & constant) != mask) | |
8859 | { | |
8860 | if (constant == 0) | |
8861 | warning (OPT_Wsign_compare, | |
8862 | "promoted ~unsigned is always non-zero"); | |
8863 | else | |
8e70fb09 | 8864 | warning_at (location, OPT_Wsign_compare, |
8865 | "comparison of promoted ~unsigned with constant"); | |
13869a99 | 8866 | } |
8867 | } | |
8868 | } | |
8869 | else if (unsignedp0 && unsignedp1 | |
8870 | && (TYPE_PRECISION (TREE_TYPE (op0)) | |
8871 | < TYPE_PRECISION (result_type)) | |
8872 | && (TYPE_PRECISION (TREE_TYPE (op1)) | |
8873 | < TYPE_PRECISION (result_type))) | |
8e70fb09 | 8874 | warning_at (location, OPT_Wsign_compare, |
13869a99 | 8875 | "comparison of promoted ~unsigned with unsigned"); |
8876 | } | |
8877 | } | |
8878 | ||
1f3233d1 | 8879 | #include "gt-c-common.h" |