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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, |
60a0513e | 3 | 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
b0fc3e72 | 4 | |
f12b58b3 | 5 | This file is part of GCC. |
b0fc3e72 | 6 | |
f12b58b3 | 7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
b0fc3e72 | 11 | |
f12b58b3 | 12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
b0fc3e72 | 16 | |
17 | You should have received a copy of the GNU General Public License | |
f12b58b3 | 18 | along with GCC; see the file COPYING. If not, write to the Free |
67ce556b | 19 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
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" |
cdc9fa3e | 36 | #include "diagnostic.h" |
d8c9779c | 37 | #include "tm_p.h" |
4e91a871 | 38 | #include "obstack.h" |
a654e028 | 39 | #include "cpplib.h" |
8ee295a7 | 40 | #include "target.h" |
96554925 | 41 | #include "langhooks.h" |
f3dde807 | 42 | #include "tree-inline.h" |
7acb29a3 | 43 | #include "c-tree.h" |
69579044 | 44 | #include "toplev.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" |
fd6f6435 | 51 | |
90cc7820 | 52 | cpp_reader *parse_in; /* Declared in c-pragma.h. */ |
a654e028 | 53 | |
174fcc61 | 54 | /* We let tm.h override the types used here, to handle trivial differences |
55 | such as the choice of unsigned int or long unsigned int for size_t. | |
56 | When machines start needing nontrivial differences in the size type, | |
57 | it would be best to do something here to figure out automatically | |
58 | from other information what type to use. */ | |
59 | ||
60 | #ifndef SIZE_TYPE | |
61 | #define SIZE_TYPE "long unsigned int" | |
62 | #endif | |
63 | ||
73673831 | 64 | #ifndef PID_TYPE |
65 | #define PID_TYPE "int" | |
66 | #endif | |
67 | ||
174fcc61 | 68 | #ifndef WCHAR_TYPE |
69 | #define WCHAR_TYPE "int" | |
70 | #endif | |
71 | ||
18ef7ac2 | 72 | /* WCHAR_TYPE gets overridden by -fshort-wchar. */ |
73 | #define MODIFIED_WCHAR_TYPE \ | |
74 | (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE) | |
75 | ||
194c4d9f | 76 | #ifndef PTRDIFF_TYPE |
77 | #define PTRDIFF_TYPE "long int" | |
78 | #endif | |
79 | ||
6bf5ed8d | 80 | #ifndef WINT_TYPE |
81 | #define WINT_TYPE "unsigned int" | |
82 | #endif | |
83 | ||
84 | #ifndef INTMAX_TYPE | |
85 | #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
86 | ? "int" \ | |
87 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
88 | ? "long int" \ | |
89 | : "long long int")) | |
90 | #endif | |
91 | ||
92 | #ifndef UINTMAX_TYPE | |
93 | #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
94 | ? "unsigned int" \ | |
95 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
96 | ? "long unsigned int" \ | |
97 | : "long long unsigned int")) | |
98 | #endif | |
99 | ||
72040e7e | 100 | /* The following symbols are subsumed in the c_global_trees array, and |
44e9fa65 | 101 | listed here individually for documentation purposes. |
72040e7e | 102 | |
103 | INTEGER_TYPE and REAL_TYPE nodes for the standard data types. | |
104 | ||
105 | tree short_integer_type_node; | |
106 | tree long_integer_type_node; | |
107 | tree long_long_integer_type_node; | |
108 | ||
109 | tree short_unsigned_type_node; | |
110 | tree long_unsigned_type_node; | |
111 | tree long_long_unsigned_type_node; | |
112 | ||
3c2239cf | 113 | tree truthvalue_type_node; |
114 | tree truthvalue_false_node; | |
115 | tree truthvalue_true_node; | |
72040e7e | 116 | |
117 | tree ptrdiff_type_node; | |
118 | ||
119 | tree unsigned_char_type_node; | |
120 | tree signed_char_type_node; | |
121 | tree wchar_type_node; | |
122 | tree signed_wchar_type_node; | |
123 | tree unsigned_wchar_type_node; | |
124 | ||
125 | tree float_type_node; | |
126 | tree double_type_node; | |
127 | tree long_double_type_node; | |
128 | ||
129 | tree complex_integer_type_node; | |
130 | tree complex_float_type_node; | |
131 | tree complex_double_type_node; | |
132 | tree complex_long_double_type_node; | |
133 | ||
c4503c0a | 134 | tree dfloat32_type_node; |
135 | tree dfloat64_type_node; | |
136 | tree_dfloat128_type_node; | |
137 | ||
72040e7e | 138 | tree intQI_type_node; |
139 | tree intHI_type_node; | |
140 | tree intSI_type_node; | |
141 | tree intDI_type_node; | |
142 | tree intTI_type_node; | |
143 | ||
144 | tree unsigned_intQI_type_node; | |
145 | tree unsigned_intHI_type_node; | |
146 | tree unsigned_intSI_type_node; | |
147 | tree unsigned_intDI_type_node; | |
148 | tree unsigned_intTI_type_node; | |
149 | ||
150 | tree widest_integer_literal_type_node; | |
151 | tree widest_unsigned_literal_type_node; | |
152 | ||
153 | Nodes for types `void *' and `const void *'. | |
154 | ||
155 | tree ptr_type_node, const_ptr_type_node; | |
156 | ||
157 | Nodes for types `char *' and `const char *'. | |
158 | ||
159 | tree string_type_node, const_string_type_node; | |
160 | ||
161 | Type `char[SOMENUMBER]'. | |
162 | Used when an array of char is needed and the size is irrelevant. | |
163 | ||
164 | tree char_array_type_node; | |
165 | ||
166 | Type `int[SOMENUMBER]' or something like it. | |
167 | Used when an array of int needed and the size is irrelevant. | |
168 | ||
169 | tree int_array_type_node; | |
170 | ||
171 | Type `wchar_t[SOMENUMBER]' or something like it. | |
172 | Used when a wide string literal is created. | |
173 | ||
174 | tree wchar_array_type_node; | |
175 | ||
176 | Type `int ()' -- used for implicit declaration of functions. | |
177 | ||
178 | tree default_function_type; | |
179 | ||
72040e7e | 180 | A VOID_TYPE node, packaged in a TREE_LIST. |
181 | ||
182 | tree void_list_node; | |
183 | ||
734c98be | 184 | The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, |
65b7f83f | 185 | and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ |
186 | VAR_DECLS, but C++ does.) | |
71d9fc9b | 187 | |
65b7f83f | 188 | tree function_name_decl_node; |
734c98be | 189 | tree pretty_function_name_decl_node; |
65b7f83f | 190 | tree c99_function_name_decl_node; |
191 | ||
192 | Stack of nested function name VAR_DECLs. | |
1cae46be | 193 | |
65b7f83f | 194 | tree saved_function_name_decls; |
71d9fc9b | 195 | |
72040e7e | 196 | */ |
197 | ||
198 | tree c_global_trees[CTI_MAX]; | |
573aba85 | 199 | \f |
574a6990 | 200 | /* Switches common to the C front ends. */ |
201 | ||
ffd56b21 | 202 | /* Nonzero if prepreprocessing only. */ |
f7070933 | 203 | |
ffd56b21 | 204 | int flag_preprocess_only; |
205 | ||
f7070933 | 206 | /* Nonzero means don't output line number information. */ |
207 | ||
208 | char flag_no_line_commands; | |
209 | ||
210 | /* Nonzero causes -E output not to be done, but directives such as | |
211 | #define that have side effects are still obeyed. */ | |
212 | ||
213 | char flag_no_output; | |
214 | ||
215 | /* Nonzero means dump macros in some fashion. */ | |
216 | ||
217 | char flag_dump_macros; | |
218 | ||
219 | /* Nonzero means pass #include lines through to the output. */ | |
220 | ||
221 | char flag_dump_includes; | |
222 | ||
d718b525 | 223 | /* Nonzero means process PCH files while preprocessing. */ |
224 | ||
225 | bool flag_pch_preprocess; | |
226 | ||
573aba85 | 227 | /* The file name to which we should write a precompiled header, or |
228 | NULL if no header will be written in this compile. */ | |
229 | ||
230 | const char *pch_file; | |
231 | ||
1ed9d5f5 | 232 | /* Nonzero if an ISO standard was selected. It rejects macros in the |
233 | user's namespace. */ | |
234 | int flag_iso; | |
235 | ||
236 | /* Nonzero if -undef was given. It suppresses target built-in macros | |
237 | and assertions. */ | |
238 | int flag_undef; | |
239 | ||
0270ae90 | 240 | /* Nonzero means don't recognize the non-ANSI builtin functions. */ |
241 | ||
242 | int flag_no_builtin; | |
243 | ||
244 | /* Nonzero means don't recognize the non-ANSI builtin functions. | |
245 | -ansi sets this. */ | |
246 | ||
247 | int flag_no_nonansi_builtin; | |
248 | ||
174fcc61 | 249 | /* Nonzero means give `double' the same size as `float'. */ |
250 | ||
251 | int flag_short_double; | |
252 | ||
253 | /* Nonzero means give `wchar_t' the same size as `short'. */ | |
254 | ||
255 | int flag_short_wchar; | |
256 | ||
546c4794 | 257 | /* Nonzero means allow implicit conversions between vectors with |
258 | differing numbers of subparts and/or differing element types. */ | |
259 | int flag_lax_vector_conversions; | |
260 | ||
07ebd091 | 261 | /* Nonzero means allow Microsoft extensions without warnings or errors. */ |
262 | int flag_ms_extensions; | |
263 | ||
574a6990 | 264 | /* Nonzero means don't recognize the keyword `asm'. */ |
265 | ||
266 | int flag_no_asm; | |
267 | ||
574a6990 | 268 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
269 | ||
270 | int flag_signed_bitfields = 1; | |
574a6990 | 271 | |
1cae46be | 272 | /* Warn about #pragma directives that are not recognized. */ |
574a6990 | 273 | |
1cae46be | 274 | int warn_unknown_pragmas; /* Tri state variable. */ |
574a6990 | 275 | |
574a6990 | 276 | /* Warn about format/argument anomalies in calls to formatted I/O functions |
277 | (*printf, *scanf, strftime, strfmon, etc.). */ | |
278 | ||
279 | int warn_format; | |
280 | ||
ae84079f | 281 | /* Warn about using __null (as NULL in C++) as sentinel. For code compiled |
282 | with GCC this doesn't matter as __null is guaranteed to have the right | |
283 | size. */ | |
284 | ||
285 | int warn_strict_null_sentinel; | |
286 | ||
c17b85ea | 287 | /* Zero means that faster, ...NonNil variants of objc_msgSend... |
288 | calls will be used in ObjC; passing nil receivers to such calls | |
289 | will most likely result in crashes. */ | |
290 | int flag_nil_receivers = 1; | |
291 | ||
c17b85ea | 292 | /* Nonzero means that code generation will be altered to support |
293 | "zero-link" execution. This currently affects ObjC only, but may | |
294 | affect other languages in the future. */ | |
295 | int flag_zero_link = 0; | |
296 | ||
297 | /* Nonzero means emit an '__OBJC, __image_info' for the current translation | |
298 | unit. It will inform the ObjC runtime that class definition(s) herein | |
299 | contained are to replace one(s) previously loaded. */ | |
300 | int flag_replace_objc_classes = 0; | |
b27ac6b5 | 301 | |
574a6990 | 302 | /* C/ObjC language option variables. */ |
303 | ||
304 | ||
574a6990 | 305 | /* Nonzero means allow type mismatches in conditional expressions; |
306 | just make their values `void'. */ | |
307 | ||
308 | int flag_cond_mismatch; | |
309 | ||
310 | /* Nonzero means enable C89 Amendment 1 features. */ | |
311 | ||
312 | int flag_isoc94; | |
313 | ||
314 | /* Nonzero means use the ISO C99 dialect of C. */ | |
315 | ||
316 | int flag_isoc99; | |
317 | ||
8b332087 | 318 | /* Nonzero means that we have builtin functions, and main is an int. */ |
574a6990 | 319 | |
320 | int flag_hosted = 1; | |
321 | ||
574a6990 | 322 | /* Warn if main is suspicious. */ |
323 | ||
324 | int warn_main; | |
325 | ||
574a6990 | 326 | |
327 | /* ObjC language option variables. */ | |
328 | ||
329 | ||
330 | /* Open and close the file for outputting class declarations, if | |
331 | requested (ObjC). */ | |
332 | ||
333 | int flag_gen_declaration; | |
334 | ||
574a6990 | 335 | /* Tells the compiler that this is a special run. Do not perform any |
336 | compiling, instead we are to test some platform dependent features | |
337 | and output a C header file with appropriate definitions. */ | |
338 | ||
339 | int print_struct_values; | |
340 | ||
48df57af | 341 | /* Tells the compiler what is the constant string class for Objc. */ |
574a6990 | 342 | |
343 | const char *constant_string_class_name; | |
344 | ||
574a6990 | 345 | |
346 | /* C++ language option variables. */ | |
347 | ||
348 | ||
349 | /* Nonzero means don't recognize any extension keywords. */ | |
350 | ||
351 | int flag_no_gnu_keywords; | |
352 | ||
353 | /* Nonzero means do emit exported implementations of functions even if | |
354 | they can be inlined. */ | |
355 | ||
356 | int flag_implement_inlines = 1; | |
357 | ||
574a6990 | 358 | /* Nonzero means that implicit instantiations will be emitted if needed. */ |
359 | ||
360 | int flag_implicit_templates = 1; | |
361 | ||
362 | /* Nonzero means that implicit instantiations of inline templates will be | |
363 | emitted if needed, even if instantiations of non-inline templates | |
364 | aren't. */ | |
365 | ||
366 | int flag_implicit_inline_templates = 1; | |
367 | ||
368 | /* Nonzero means generate separate instantiation control files and | |
369 | juggle them at link time. */ | |
370 | ||
371 | int flag_use_repository; | |
372 | ||
373 | /* Nonzero if we want to issue diagnostics that the standard says are not | |
374 | required. */ | |
375 | ||
376 | int flag_optional_diags = 1; | |
377 | ||
378 | /* Nonzero means we should attempt to elide constructors when possible. */ | |
379 | ||
380 | int flag_elide_constructors = 1; | |
381 | ||
382 | /* Nonzero means that member functions defined in class scope are | |
383 | inline by default. */ | |
384 | ||
385 | int flag_default_inline = 1; | |
386 | ||
387 | /* Controls whether compiler generates 'type descriptor' that give | |
388 | run-time type information. */ | |
389 | ||
390 | int flag_rtti = 1; | |
391 | ||
392 | /* Nonzero if we want to conserve space in the .o files. We do this | |
393 | by putting uninitialized data and runtime initialized data into | |
394 | .common instead of .data at the expense of not flagging multiple | |
395 | definitions. */ | |
396 | ||
397 | int flag_conserve_space; | |
398 | ||
399 | /* Nonzero if we want to obey access control semantics. */ | |
400 | ||
401 | int flag_access_control = 1; | |
402 | ||
403 | /* Nonzero if we want to check the return value of new and avoid calling | |
404 | constructors if it is a null pointer. */ | |
405 | ||
406 | int flag_check_new; | |
407 | ||
0fe6eeac | 408 | /* Nonzero if we want to allow the use of experimental features that |
409 | are likely to become part of C++0x. */ | |
410 | ||
411 | int flag_cpp0x = 0; | |
412 | ||
574a6990 | 413 | /* Nonzero if we want the new ISO rules for pushing a new scope for `for' |
414 | initialization variables. | |
415 | 0: Old rules, set by -fno-for-scope. | |
416 | 2: New ISO rules, set by -ffor-scope. | |
417 | 1: Try to implement new ISO rules, but with backup compatibility | |
418 | (and warnings). This is the default, for now. */ | |
419 | ||
420 | int flag_new_for_scope = 1; | |
421 | ||
422 | /* Nonzero if we want to emit defined symbols with common-like linkage as | |
423 | weak symbols where possible, in order to conform to C++ semantics. | |
424 | Otherwise, emit them as local symbols. */ | |
425 | ||
426 | int flag_weak = 1; | |
427 | ||
e7aa92b2 | 428 | /* 0 means we want the preprocessor to not emit line directives for |
429 | the current working directory. 1 means we want it to do it. -1 | |
430 | means we should decide depending on whether debugging information | |
431 | is being emitted or not. */ | |
432 | ||
433 | int flag_working_directory = -1; | |
434 | ||
574a6990 | 435 | /* Nonzero to use __cxa_atexit, rather than atexit, to register |
3bf418bd | 436 | destructors for local statics and global objects. '2' means it has been |
437 | set nonzero as a default, not by a command-line flag. */ | |
574a6990 | 438 | |
439 | int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT; | |
440 | ||
3bf418bd | 441 | /* Nonzero to use __cxa_get_exception_ptr in C++ exception-handling |
442 | code. '2' means it has not been set explicitly on the command line. */ | |
443 | ||
444 | int flag_use_cxa_get_exception_ptr = 2; | |
445 | ||
574a6990 | 446 | /* Nonzero means make the default pedwarns warnings instead of errors. |
447 | The value of this flag is ignored if -pedantic is specified. */ | |
448 | ||
449 | int flag_permissive; | |
450 | ||
451 | /* Nonzero means to implement standard semantics for exception | |
452 | specifications, calling unexpected if an exception is thrown that | |
453 | doesn't match the specification. Zero means to treat them as | |
454 | assertions and optimize accordingly, but not check them. */ | |
455 | ||
456 | int flag_enforce_eh_specs = 1; | |
457 | ||
4813f5af | 458 | /* Nonzero means to generate thread-safe code for initializing local |
459 | statics. */ | |
460 | ||
461 | int flag_threadsafe_statics = 1; | |
462 | ||
574a6990 | 463 | /* Nonzero means warn about implicit declarations. */ |
464 | ||
465 | int warn_implicit = 1; | |
466 | ||
574a6990 | 467 | /* Maximum template instantiation depth. This limit is rather |
468 | arbitrary, but it exists to limit the time it takes to notice | |
469 | infinite template instantiations. */ | |
470 | ||
471 | int max_tinst_depth = 500; | |
472 | ||
473 | ||
474 | ||
988fc1d1 | 475 | /* The elements of `ridpointers' are identifier nodes for the reserved |
476 | type names and storage classes. It is indexed by a RID_... value. */ | |
477 | tree *ridpointers; | |
478 | ||
1cae46be | 479 | tree (*make_fname_decl) (tree, int); |
9e5a737d | 480 | |
e78703c1 | 481 | /* Nonzero means the expression being parsed will never be evaluated. |
482 | This is a count, since unevaluated expressions can nest. */ | |
483 | int skip_evaluation; | |
484 | ||
2c0e001b | 485 | /* Information about how a function name is generated. */ |
65b7f83f | 486 | struct fname_var_t |
487 | { | |
e99c3a1d | 488 | tree *const decl; /* pointer to the VAR_DECL. */ |
489 | const unsigned rid; /* RID number for the identifier. */ | |
490 | const int pretty; /* How pretty is it? */ | |
65b7f83f | 491 | }; |
492 | ||
2c0e001b | 493 | /* The three ways of getting then name of the current function. */ |
65b7f83f | 494 | |
495 | const struct fname_var_t fname_vars[] = | |
496 | { | |
2c0e001b | 497 | /* C99 compliant __func__, must be first. */ |
65b7f83f | 498 | {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, |
2c0e001b | 499 | /* GCC __FUNCTION__ compliant. */ |
65b7f83f | 500 | {&function_name_decl_node, RID_FUNCTION_NAME, 0}, |
2c0e001b | 501 | /* GCC __PRETTY_FUNCTION__ compliant. */ |
65b7f83f | 502 | {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, |
503 | {NULL, 0, 0}, | |
504 | }; | |
505 | ||
2ca392fd | 506 | static tree check_case_value (tree); |
507 | static bool check_case_bounds (tree, tree, tree *, tree *); | |
be43ff5a | 508 | |
1cae46be | 509 | static tree handle_packed_attribute (tree *, tree, tree, int, bool *); |
510 | static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
511 | static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
512 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
513 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); | |
514 | static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
515 | bool *); | |
541e4101 | 516 | static tree handle_gnu_inline_attribute (tree *, tree, tree, int, |
517 | bool *); | |
0cdd9887 | 518 | static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 519 | static tree handle_used_attribute (tree *, tree, tree, int, bool *); |
520 | static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
62eec3b4 | 521 | static tree handle_externally_visible_attribute (tree *, tree, tree, int, |
522 | bool *); | |
1cae46be | 523 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); |
524 | static tree handle_transparent_union_attribute (tree *, tree, tree, | |
525 | int, bool *); | |
526 | static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
527 | static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
528 | static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
529 | static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
530 | static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
531 | static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
532 | static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
f4a30bd7 | 533 | static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; |
1cae46be | 534 | static tree handle_visibility_attribute (tree *, tree, tree, int, |
535 | bool *); | |
536 | static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
537 | bool *); | |
538 | static tree handle_no_instrument_function_attribute (tree *, tree, | |
539 | tree, int, bool *); | |
540 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
26d1c5ff | 541 | static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 542 | static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, |
543 | bool *); | |
544 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
fc09b200 | 545 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 546 | static tree handle_deprecated_attribute (tree *, tree, tree, int, |
547 | bool *); | |
548 | static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
549 | bool *); | |
550 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
551 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
552 | static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
8a8cdb8d | 553 | static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, |
554 | bool *); | |
bf6c8de0 | 555 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); |
1cae46be | 556 | |
557 | static void check_function_nonnull (tree, tree); | |
558 | static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); | |
559 | static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
560 | static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
860251be | 561 | static int resort_field_decl_cmp (const void *, const void *); |
dbf6c367 | 562 | |
f8e93a2e | 563 | /* Table of machine-independent attributes common to all C-like languages. */ |
564 | const struct attribute_spec c_common_attribute_table[] = | |
565 | { | |
566 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
567 | { "packed", 0, 0, false, false, false, | |
1cae46be | 568 | handle_packed_attribute }, |
f8e93a2e | 569 | { "nocommon", 0, 0, true, false, false, |
570 | handle_nocommon_attribute }, | |
571 | { "common", 0, 0, true, false, false, | |
572 | handle_common_attribute }, | |
573 | /* FIXME: logically, noreturn attributes should be listed as | |
574 | "false, true, true" and apply to function types. But implementing this | |
575 | would require all the places in the compiler that use TREE_THIS_VOLATILE | |
576 | on a decl to identify non-returning functions to be located and fixed | |
577 | to check the function type instead. */ | |
578 | { "noreturn", 0, 0, true, false, false, | |
579 | handle_noreturn_attribute }, | |
580 | { "volatile", 0, 0, true, false, false, | |
581 | handle_noreturn_attribute }, | |
582 | { "noinline", 0, 0, true, false, false, | |
583 | handle_noinline_attribute }, | |
584 | { "always_inline", 0, 0, true, false, false, | |
585 | handle_always_inline_attribute }, | |
541e4101 | 586 | { "gnu_inline", 0, 0, true, false, false, |
587 | handle_gnu_inline_attribute }, | |
0cdd9887 | 588 | { "flatten", 0, 0, true, false, false, |
a0c938f0 | 589 | handle_flatten_attribute }, |
f8e93a2e | 590 | { "used", 0, 0, true, false, false, |
591 | handle_used_attribute }, | |
592 | { "unused", 0, 0, false, false, false, | |
593 | handle_unused_attribute }, | |
62eec3b4 | 594 | { "externally_visible", 0, 0, true, false, false, |
595 | handle_externally_visible_attribute }, | |
f8e93a2e | 596 | /* The same comments as for noreturn attributes apply to const ones. */ |
597 | { "const", 0, 0, true, false, false, | |
598 | handle_const_attribute }, | |
599 | { "transparent_union", 0, 0, false, false, false, | |
600 | handle_transparent_union_attribute }, | |
601 | { "constructor", 0, 0, true, false, false, | |
602 | handle_constructor_attribute }, | |
603 | { "destructor", 0, 0, true, false, false, | |
604 | handle_destructor_attribute }, | |
605 | { "mode", 1, 1, false, true, false, | |
606 | handle_mode_attribute }, | |
607 | { "section", 1, 1, true, false, false, | |
608 | handle_section_attribute }, | |
609 | { "aligned", 0, 1, false, false, false, | |
610 | handle_aligned_attribute }, | |
611 | { "weak", 0, 0, true, false, false, | |
612 | handle_weak_attribute }, | |
613 | { "alias", 1, 1, true, false, false, | |
614 | handle_alias_attribute }, | |
f4a30bd7 | 615 | { "weakref", 0, 1, true, false, false, |
616 | handle_weakref_attribute }, | |
f8e93a2e | 617 | { "no_instrument_function", 0, 0, true, false, false, |
618 | handle_no_instrument_function_attribute }, | |
619 | { "malloc", 0, 0, true, false, false, | |
620 | handle_malloc_attribute }, | |
26d1c5ff | 621 | { "returns_twice", 0, 0, true, false, false, |
622 | handle_returns_twice_attribute }, | |
f8e93a2e | 623 | { "no_stack_limit", 0, 0, true, false, false, |
624 | handle_no_limit_stack_attribute }, | |
625 | { "pure", 0, 0, true, false, false, | |
626 | handle_pure_attribute }, | |
fc09b200 | 627 | /* For internal use (marking of builtins) only. The name contains space |
628 | to prevent its usage in source code. */ | |
629 | { "no vops", 0, 0, true, false, false, | |
630 | handle_novops_attribute }, | |
f8e93a2e | 631 | { "deprecated", 0, 0, false, false, false, |
632 | handle_deprecated_attribute }, | |
633 | { "vector_size", 1, 1, false, true, false, | |
634 | handle_vector_size_attribute }, | |
b212f378 | 635 | { "visibility", 1, 1, false, false, false, |
f8e93a2e | 636 | handle_visibility_attribute }, |
24dfead4 | 637 | { "tls_model", 1, 1, true, false, false, |
638 | handle_tls_model_attribute }, | |
dbf6c367 | 639 | { "nonnull", 0, -1, false, true, true, |
640 | handle_nonnull_attribute }, | |
fa987697 | 641 | { "nothrow", 0, 0, true, false, false, |
642 | handle_nothrow_attribute }, | |
cb59f969 | 643 | { "may_alias", 0, 0, false, true, false, NULL }, |
7acb29a3 | 644 | { "cleanup", 1, 1, true, false, false, |
645 | handle_cleanup_attribute }, | |
8a8cdb8d | 646 | { "warn_unused_result", 0, 0, false, true, true, |
647 | handle_warn_unused_result_attribute }, | |
50ca527f | 648 | { "sentinel", 0, 1, false, true, true, |
bf6c8de0 | 649 | handle_sentinel_attribute }, |
f8e93a2e | 650 | { NULL, 0, 0, false, false, false, NULL } |
651 | }; | |
652 | ||
653 | /* Give the specifications for the format attributes, used by C and all | |
d716ce75 | 654 | descendants. */ |
f8e93a2e | 655 | |
656 | const struct attribute_spec c_common_format_attribute_table[] = | |
657 | { | |
658 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
659 | { "format", 3, 3, false, true, true, | |
660 | handle_format_attribute }, | |
661 | { "format_arg", 1, 1, false, true, true, | |
662 | handle_format_arg_attribute }, | |
663 | { NULL, 0, 0, false, false, false, NULL } | |
664 | }; | |
665 | ||
2c0e001b | 666 | /* Push current bindings for the function name VAR_DECLS. */ |
f4e3c278 | 667 | |
668 | void | |
1cae46be | 669 | start_fname_decls (void) |
f4e3c278 | 670 | { |
65b7f83f | 671 | unsigned ix; |
672 | tree saved = NULL_TREE; | |
1cae46be | 673 | |
65b7f83f | 674 | for (ix = 0; fname_vars[ix].decl; ix++) |
675 | { | |
676 | tree decl = *fname_vars[ix].decl; | |
f4e3c278 | 677 | |
65b7f83f | 678 | if (decl) |
679 | { | |
7016c612 | 680 | saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved); |
65b7f83f | 681 | *fname_vars[ix].decl = NULL_TREE; |
682 | } | |
683 | } | |
684 | if (saved || saved_function_name_decls) | |
685 | /* Normally they'll have been NULL, so only push if we've got a | |
686 | stack, or they are non-NULL. */ | |
687 | saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
688 | saved_function_name_decls); | |
689 | } | |
690 | ||
2363ef00 | 691 | /* Finish up the current bindings, adding them into the current function's |
692 | statement tree. This must be done _before_ finish_stmt_tree is called. | |
693 | If there is no current function, we must be at file scope and no statements | |
694 | are involved. Pop the previous bindings. */ | |
65b7f83f | 695 | |
696 | void | |
1cae46be | 697 | finish_fname_decls (void) |
65b7f83f | 698 | { |
699 | unsigned ix; | |
2363ef00 | 700 | tree stmts = NULL_TREE; |
65b7f83f | 701 | tree stack = saved_function_name_decls; |
702 | ||
703 | for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
2363ef00 | 704 | append_to_statement_list (TREE_VALUE (stack), &stmts); |
1cae46be | 705 | |
2363ef00 | 706 | if (stmts) |
65b7f83f | 707 | { |
2363ef00 | 708 | tree *bodyp = &DECL_SAVED_TREE (current_function_decl); |
5c423bd6 | 709 | |
2363ef00 | 710 | if (TREE_CODE (*bodyp) == BIND_EXPR) |
711 | bodyp = &BIND_EXPR_BODY (*bodyp); | |
81010c97 | 712 | |
bc2b76e0 | 713 | append_to_statement_list_force (*bodyp, &stmts); |
2363ef00 | 714 | *bodyp = stmts; |
65b7f83f | 715 | } |
1cae46be | 716 | |
65b7f83f | 717 | for (ix = 0; fname_vars[ix].decl; ix++) |
718 | *fname_vars[ix].decl = NULL_TREE; | |
1cae46be | 719 | |
65b7f83f | 720 | if (stack) |
f4e3c278 | 721 | { |
2c0e001b | 722 | /* We had saved values, restore them. */ |
65b7f83f | 723 | tree saved; |
724 | ||
725 | for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
726 | { | |
727 | tree decl = TREE_PURPOSE (saved); | |
728 | unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
1cae46be | 729 | |
65b7f83f | 730 | *fname_vars[ix].decl = decl; |
731 | } | |
732 | stack = TREE_CHAIN (stack); | |
f4e3c278 | 733 | } |
65b7f83f | 734 | saved_function_name_decls = stack; |
735 | } | |
736 | ||
81010c97 | 737 | /* Return the text name of the current function, suitably prettified |
5fc7fa69 | 738 | by PRETTY_P. Return string must be freed by caller. */ |
65b7f83f | 739 | |
740 | const char * | |
1cae46be | 741 | fname_as_string (int pretty_p) |
65b7f83f | 742 | { |
9ad4bb1e | 743 | const char *name = "top level"; |
5fc7fa69 | 744 | char *namep; |
9ad4bb1e | 745 | int vrb = 2; |
746 | ||
84166705 | 747 | if (!pretty_p) |
9ad4bb1e | 748 | { |
749 | name = ""; | |
750 | vrb = 0; | |
751 | } | |
752 | ||
753 | if (current_function_decl) | |
dc24ddbd | 754 | name = lang_hooks.decl_printable_name (current_function_decl, vrb); |
9ad4bb1e | 755 | |
5fc7fa69 | 756 | if (c_lex_string_translate) |
757 | { | |
758 | int len = strlen (name) + 3; /* Two for '"'s. One for NULL. */ | |
759 | cpp_string cstr = { 0, 0 }, strname; | |
760 | ||
4fd61bc6 | 761 | namep = XNEWVEC (char, len); |
5fc7fa69 | 762 | snprintf (namep, len, "\"%s\"", name); |
763 | strname.text = (unsigned char *) namep; | |
764 | strname.len = len - 1; | |
765 | ||
766 | if (cpp_interpret_string (parse_in, &strname, 1, &cstr, false)) | |
80314440 | 767 | { |
768 | XDELETEVEC (namep); | |
769 | return (char *) cstr.text; | |
770 | } | |
5fc7fa69 | 771 | } |
772 | else | |
dd492705 | 773 | namep = xstrdup (name); |
5fc7fa69 | 774 | |
775 | return namep; | |
65b7f83f | 776 | } |
777 | ||
05f9ea78 | 778 | /* Expand DECL if it declares an entity not handled by the |
779 | common code. */ | |
780 | ||
781 | int | |
782 | c_expand_decl (tree decl) | |
783 | { | |
784 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
785 | { | |
786 | /* Let the back-end know about this variable. */ | |
787 | if (!anon_aggr_type_p (TREE_TYPE (decl))) | |
a0c938f0 | 788 | emit_local_var (decl); |
05f9ea78 | 789 | else |
a0c938f0 | 790 | expand_anon_union_decl (decl, NULL_TREE, |
791 | DECL_ANON_UNION_ELEMS (decl)); | |
05f9ea78 | 792 | } |
05f9ea78 | 793 | else |
794 | return 0; | |
795 | ||
796 | return 1; | |
797 | } | |
798 | ||
799 | ||
65b7f83f | 800 | /* Return the VAR_DECL for a const char array naming the current |
801 | function. If the VAR_DECL has not yet been created, create it | |
802 | now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
803 | ID is its name (unfortunately C and C++ hold the RID values of | |
804 | keywords in different places, so we can't derive RID from ID in | |
dd5b4b36 | 805 | this language independent code. */ |
65b7f83f | 806 | |
807 | tree | |
1cae46be | 808 | fname_decl (unsigned int rid, tree id) |
65b7f83f | 809 | { |
810 | unsigned ix; | |
811 | tree decl = NULL_TREE; | |
812 | ||
813 | for (ix = 0; fname_vars[ix].decl; ix++) | |
814 | if (fname_vars[ix].rid == rid) | |
815 | break; | |
816 | ||
817 | decl = *fname_vars[ix].decl; | |
818 | if (!decl) | |
f4e3c278 | 819 | { |
2222b3c6 | 820 | /* If a tree is built here, it would normally have the lineno of |
821 | the current statement. Later this tree will be moved to the | |
822 | beginning of the function and this line number will be wrong. | |
823 | To avoid this problem set the lineno to 0 here; that prevents | |
7299020b | 824 | it from appearing in the RTL. */ |
2363ef00 | 825 | tree stmts; |
9a6486a6 | 826 | location_t saved_location = input_location; |
827 | #ifdef USE_MAPPED_LOCATION | |
828 | input_location = UNKNOWN_LOCATION; | |
829 | #else | |
fa70df70 | 830 | input_line = 0; |
9a6486a6 | 831 | #endif |
1cae46be | 832 | |
2363ef00 | 833 | stmts = push_stmt_list (); |
65b7f83f | 834 | decl = (*make_fname_decl) (id, fname_vars[ix].pretty); |
2363ef00 | 835 | stmts = pop_stmt_list (stmts); |
836 | if (!IS_EMPTY_STMT (stmts)) | |
837 | saved_function_name_decls | |
838 | = tree_cons (decl, stmts, saved_function_name_decls); | |
65b7f83f | 839 | *fname_vars[ix].decl = decl; |
9a6486a6 | 840 | input_location = saved_location; |
f4e3c278 | 841 | } |
65b7f83f | 842 | if (!ix && !current_function_decl) |
cbb0dbb0 | 843 | pedwarn ("%qD is not defined outside of function scope", decl); |
81010c97 | 844 | |
65b7f83f | 845 | return decl; |
f4e3c278 | 846 | } |
847 | ||
070236f0 | 848 | /* Given a STRING_CST, give it a suitable array-of-chars data type. */ |
b0fc3e72 | 849 | |
850 | tree | |
1cae46be | 851 | fix_string_type (tree value) |
b0fc3e72 | 852 | { |
070236f0 | 853 | const int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; |
854 | const int wide_flag = TREE_TYPE (value) == wchar_array_type_node; | |
070236f0 | 855 | int length = TREE_STRING_LENGTH (value); |
856 | int nchars; | |
00d26680 | 857 | tree e_type, i_type, a_type; |
858 | ||
73be5127 | 859 | /* Compute the number of elements, for the array type. */ |
b0fc3e72 | 860 | nchars = wide_flag ? length / wchar_bytes : length; |
861 | ||
1d752508 | 862 | /* C89 2.2.4.1, C99 5.2.4.1 (Translation limits). The analogous |
863 | limit in C++98 Annex B is very large (65536) and is not normative, | |
864 | so we do not diagnose it (warn_overlength_strings is forced off | |
865 | in c_common_post_options). */ | |
866 | if (warn_overlength_strings) | |
867 | { | |
868 | const int nchars_max = flag_isoc99 ? 4095 : 509; | |
869 | const int relevant_std = flag_isoc99 ? 99 : 90; | |
870 | if (nchars - 1 > nchars_max) | |
871 | /* Translators: The %d after 'ISO C' will be 90 or 99. Do not | |
872 | separate the %d from the 'C'. 'ISO' should not be | |
873 | translated, but it may be moved after 'C%d' in languages | |
874 | where modifiers follow nouns. */ | |
875 | pedwarn ("string length %qd is greater than the length %qd " | |
876 | "ISO C%d compilers are required to support", | |
877 | nchars - 1, nchars_max, relevant_std); | |
878 | } | |
82cfc7f7 | 879 | |
390be14e | 880 | /* Create the array type for the string constant. The ISO C++ |
881 | standard says that a string literal has type `const char[N]' or | |
882 | `const wchar_t[N]'. We use the same logic when invoked as a C | |
883 | front-end with -Wwrite-strings. | |
884 | ??? We should change the type of an expression depending on the | |
885 | state of a warning flag. We should just be warning -- see how | |
886 | this is handled in the C++ front-end for the deprecated implicit | |
887 | conversion from string literals to `char*' or `wchar_t*'. | |
00d26680 | 888 | |
889 | The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified | |
890 | array type being the unqualified version of that type. | |
891 | Therefore, if we are constructing an array of const char, we must | |
892 | construct the matching unqualified array type first. The C front | |
893 | end does not require this, but it does no harm, so we do it | |
894 | unconditionally. */ | |
1d752508 | 895 | e_type = wide_flag ? wchar_type_node : char_type_node; |
7016c612 | 896 | i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1)); |
00d26680 | 897 | a_type = build_array_type (e_type, i_type); |
390be14e | 898 | if (c_dialect_cxx() || warn_write_strings) |
aebc8537 | 899 | a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST); |
3a10ba35 | 900 | |
00d26680 | 901 | TREE_TYPE (value) = a_type; |
b8e3b7ad | 902 | TREE_CONSTANT (value) = 1; |
4ee9c684 | 903 | TREE_INVARIANT (value) = 1; |
a814bad5 | 904 | TREE_READONLY (value) = 1; |
b0fc3e72 | 905 | TREE_STATIC (value) = 1; |
906 | return value; | |
907 | } | |
908 | \f | |
2a1736ed | 909 | /* Print a warning if a constant expression had overflow in folding. |
910 | Invoke this function on every expression that the language | |
911 | requires to be a constant expression. | |
912 | Note the ANSI C standard says it is erroneous for a | |
913 | constant expression to overflow. */ | |
b2806639 | 914 | |
915 | void | |
1cae46be | 916 | constant_expression_warning (tree value) |
b2806639 | 917 | { |
837e1122 | 918 | if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST |
886cfd4f | 919 | || TREE_CODE (value) == VECTOR_CST |
837e1122 | 920 | || TREE_CODE (value) == COMPLEX_CST) |
eddad94a | 921 | && TREE_OVERFLOW (value) |
55972f40 | 922 | && warn_overflow |
923 | && pedantic) | |
837e1122 | 924 | pedwarn ("overflow in constant expression"); |
2a1736ed | 925 | } |
926 | ||
f170d67f | 927 | /* Print a warning if an expression had overflow in folding and its |
928 | operands hadn't. | |
929 | ||
2a1736ed | 930 | Invoke this function on every expression that |
931 | (1) appears in the source code, and | |
f170d67f | 932 | (2) is a constant expression that overflowed, and |
2a1736ed | 933 | (3) is not already checked by convert_and_check; |
f170d67f | 934 | however, do not invoke this function on operands of explicit casts |
935 | or when the expression is the result of an operator and any operand | |
936 | already overflowed. */ | |
2a1736ed | 937 | |
938 | void | |
1cae46be | 939 | overflow_warning (tree value) |
2a1736ed | 940 | { |
f170d67f | 941 | if (skip_evaluation) return; |
942 | ||
943 | switch (TREE_CODE (value)) | |
886cfd4f | 944 | { |
f170d67f | 945 | case INTEGER_CST: |
946 | warning (OPT_Woverflow, "integer overflow in expression"); | |
947 | break; | |
948 | ||
949 | case REAL_CST: | |
950 | warning (OPT_Woverflow, "floating point overflow in expression"); | |
951 | break; | |
952 | ||
953 | case VECTOR_CST: | |
954 | warning (OPT_Woverflow, "vector overflow in expression"); | |
955 | break; | |
956 | ||
957 | case COMPLEX_CST: | |
958 | if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST) | |
959 | warning (OPT_Woverflow, "complex integer overflow in expression"); | |
960 | else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST) | |
961 | warning (OPT_Woverflow, "complex floating point overflow in expression"); | |
962 | break; | |
963 | ||
964 | default: | |
965 | break; | |
886cfd4f | 966 | } |
2a1736ed | 967 | } |
968 | ||
bcf22371 | 969 | /* Print a warning about casts that might indicate violation |
970 | of strict aliasing rules if -Wstrict-aliasing is used and | |
1e31ff37 | 971 | strict aliasing mode is in effect. OTYPE is the original |
972 | TREE_TYPE of EXPR, and TYPE the type we're casting to. */ | |
bcf22371 | 973 | |
974 | void | |
1e31ff37 | 975 | strict_aliasing_warning (tree otype, tree type, tree expr) |
bcf22371 | 976 | { |
977 | if (flag_strict_aliasing && warn_strict_aliasing | |
978 | && POINTER_TYPE_P (type) && POINTER_TYPE_P (otype) | |
979 | && TREE_CODE (expr) == ADDR_EXPR | |
980 | && (DECL_P (TREE_OPERAND (expr, 0)) | |
4e62d878 | 981 | || handled_component_p (TREE_OPERAND (expr, 0))) |
bcf22371 | 982 | && !VOID_TYPE_P (TREE_TYPE (type))) |
983 | { | |
984 | /* Casting the address of an object to non void pointer. Warn | |
985 | if the cast breaks type based aliasing. */ | |
986 | if (!COMPLETE_TYPE_P (TREE_TYPE (type))) | |
987 | warning (OPT_Wstrict_aliasing, "type-punning to incomplete type " | |
988 | "might break strict-aliasing rules"); | |
989 | else | |
990 | { | |
991 | HOST_WIDE_INT set1 = get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))); | |
992 | HOST_WIDE_INT set2 = get_alias_set (TREE_TYPE (type)); | |
993 | ||
994 | if (!alias_sets_conflict_p (set1, set2)) | |
995 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
996 | "pointer will break strict-aliasing rules"); | |
997 | else if (warn_strict_aliasing > 1 | |
998 | && !alias_sets_might_conflict_p (set1, set2)) | |
999 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1000 | "pointer might break strict-aliasing rules"); | |
1001 | } | |
1002 | } | |
1003 | } | |
1004 | ||
50247dd9 | 1005 | /* Print a warning about if (); or if () .. else; constructs |
1006 | via the special empty statement node that we create. INNER_THEN | |
1007 | and INNER_ELSE are the statement lists of the if and the else | |
1008 | block. */ | |
1009 | ||
1010 | void | |
1011 | empty_body_warning (tree inner_then, tree inner_else) | |
1012 | { | |
b321a57a | 1013 | if (warn_empty_body) |
50247dd9 | 1014 | { |
1015 | if (TREE_CODE (inner_then) == STATEMENT_LIST | |
1016 | && STATEMENT_LIST_TAIL (inner_then)) | |
1017 | inner_then = STATEMENT_LIST_TAIL (inner_then)->stmt; | |
1018 | ||
1019 | if (inner_else && TREE_CODE (inner_else) == STATEMENT_LIST | |
1020 | && STATEMENT_LIST_TAIL (inner_else)) | |
1021 | inner_else = STATEMENT_LIST_TAIL (inner_else)->stmt; | |
1022 | ||
1023 | if (IS_EMPTY_STMT (inner_then) && !inner_else) | |
b321a57a | 1024 | warning (OPT_Wempty_body, "%Hempty body in an if-statement", |
50247dd9 | 1025 | EXPR_LOCUS (inner_then)); |
1026 | ||
1027 | if (inner_else && IS_EMPTY_STMT (inner_else)) | |
b321a57a | 1028 | warning (OPT_Wempty_body, "%Hempty body in an else-statement", |
50247dd9 | 1029 | EXPR_LOCUS (inner_else)); |
1030 | } | |
1031 | } | |
1032 | ||
3f08e399 | 1033 | /* Warn for unlikely, improbable, or stupid DECL declarations |
1034 | of `main'. */ | |
1035 | ||
1036 | void | |
1037 | check_main_parameter_types (tree decl) | |
1038 | { | |
1039 | tree args; | |
1040 | int argct = 0; | |
1041 | ||
1042 | for (args = TYPE_ARG_TYPES (TREE_TYPE (decl)); args; | |
1043 | args = TREE_CHAIN (args)) | |
1044 | { | |
1045 | tree type = args ? TREE_VALUE (args) : 0; | |
1046 | ||
7accad14 | 1047 | if (type == void_type_node || type == error_mark_node ) |
3f08e399 | 1048 | break; |
1049 | ||
1050 | ++argct; | |
1051 | switch (argct) | |
1052 | { | |
1053 | case 1: | |
1054 | if (TYPE_MAIN_VARIANT (type) != integer_type_node) | |
1055 | pedwarn ("first argument of %q+D should be %<int%>", decl); | |
1056 | break; | |
1057 | ||
1058 | case 2: | |
1059 | if (TREE_CODE (type) != POINTER_TYPE | |
1060 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1061 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1062 | != char_type_node)) | |
1063 | pedwarn ("second argument of %q+D should be %<char **%>", | |
1064 | decl); | |
1065 | break; | |
1066 | ||
1067 | case 3: | |
1068 | if (TREE_CODE (type) != POINTER_TYPE | |
1069 | || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1070 | || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1071 | != char_type_node)) | |
1072 | pedwarn ("third argument of %q+D should probably be " | |
1073 | "%<char **%>", decl); | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* It is intentional that this message does not mention the third | |
1079 | argument because it's only mentioned in an appendix of the | |
1080 | standard. */ | |
1081 | if (argct > 0 && (argct < 2 || argct > 3)) | |
1082 | pedwarn ("%q+D takes only zero or two arguments", decl); | |
1083 | } | |
1084 | ||
546c4794 | 1085 | /* True if vector types T1 and T2 can be converted to each other |
1086 | without an explicit cast. If EMIT_LAX_NOTE is true, and T1 and T2 | |
1087 | can only be converted with -flax-vector-conversions yet that is not | |
1088 | in effect, emit a note telling the user about that option if such | |
1089 | a note has not previously been emitted. */ | |
1090 | bool | |
1091 | vector_types_convertible_p (tree t1, tree t2, bool emit_lax_note) | |
8b4b9810 | 1092 | { |
546c4794 | 1093 | static bool emitted_lax_note = false; |
ae6db8ab | 1094 | bool convertible_lax; |
1095 | ||
1096 | if ((targetm.vector_opaque_p (t1) || targetm.vector_opaque_p (t2)) | |
1097 | && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
1098 | return true; | |
1099 | ||
1100 | convertible_lax = | |
1101 | (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)) | |
1102 | && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE || | |
1103 | TYPE_PRECISION (t1) == TYPE_PRECISION (t2)) | |
1104 | && (INTEGRAL_TYPE_P (TREE_TYPE (t1)) | |
1105 | == INTEGRAL_TYPE_P (TREE_TYPE (t2)))); | |
546c4794 | 1106 | |
1107 | if (!convertible_lax || flag_lax_vector_conversions) | |
1108 | return convertible_lax; | |
1109 | ||
1110 | if (TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
1111 | && comptypes (TREE_TYPE (t1), TREE_TYPE (t2))) | |
1112 | return true; | |
1113 | ||
1114 | if (emit_lax_note && !emitted_lax_note) | |
1115 | { | |
1116 | emitted_lax_note = true; | |
1117 | inform ("use -flax-vector-conversions to permit " | |
1118 | "conversions between vectors with differing " | |
1119 | "element types or numbers of subparts"); | |
1120 | } | |
1121 | ||
1122 | return false; | |
8b4b9810 | 1123 | } |
1124 | ||
d31d55f0 | 1125 | /* Warns if the conversion of EXPR to TYPE may alter a value. |
1126 | This function is called from convert_and_check. */ | |
1127 | ||
1128 | static void | |
1129 | conversion_warning (tree type, tree expr) | |
1130 | { | |
1131 | bool give_warning = false; | |
1132 | ||
1133 | unsigned int formal_prec = TYPE_PRECISION (type); | |
1134 | ||
1135 | if (TREE_CODE (expr) == REAL_CST || TREE_CODE (expr) == INTEGER_CST) | |
1136 | { | |
1137 | /* Warn for real constant that is not an exact integer converted | |
1138 | to integer type. */ | |
1139 | if (TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE | |
1140 | && TREE_CODE (type) == INTEGER_TYPE) | |
1141 | { | |
1142 | if (!real_isinteger (TREE_REAL_CST_PTR (expr), TYPE_MODE (TREE_TYPE (expr)))) | |
1143 | give_warning = true; | |
1144 | } | |
da1fb07b | 1145 | /* Warn for an integer constant that does not fit into integer type. */ |
d31d55f0 | 1146 | else if (TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE |
1147 | && TREE_CODE (type) == INTEGER_TYPE | |
da1fb07b | 1148 | && !int_fits_type_p (expr, type)) |
1149 | { | |
1150 | if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (TREE_TYPE (expr))) | |
1151 | warning (OPT_Wconversion, | |
1152 | "negative integer implicitly converted to unsigned type"); | |
1153 | else | |
1154 | give_warning = true; | |
1155 | } | |
d31d55f0 | 1156 | else if (TREE_CODE (type) == REAL_TYPE) |
1157 | { | |
1158 | /* Warn for an integer constant that does not fit into real type. */ | |
1159 | if (TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE) | |
1160 | { | |
1161 | REAL_VALUE_TYPE a = real_value_from_int_cst (0, expr); | |
1162 | if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1163 | give_warning = true; | |
1164 | } | |
1165 | /* Warn for a real constant that does not fit into a smaller | |
1166 | real type. */ | |
1167 | else if (TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE | |
1168 | && formal_prec < TYPE_PRECISION (TREE_TYPE (expr))) | |
1169 | { | |
1170 | REAL_VALUE_TYPE a = TREE_REAL_CST (expr); | |
1171 | if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1172 | give_warning = true; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | if (give_warning) | |
1177 | warning (OPT_Wconversion, | |
1178 | "conversion to %qT alters %qT constant value", | |
1179 | type, TREE_TYPE (expr)); | |
1180 | } | |
1181 | else /* 'expr' is not a constant. */ | |
1182 | { | |
1183 | /* Warn for real types converted to integer types. */ | |
1184 | if (TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE | |
1185 | && TREE_CODE (type) == INTEGER_TYPE) | |
1186 | give_warning = true; | |
1187 | ||
1188 | else if (TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE | |
1189 | && TREE_CODE (type) == INTEGER_TYPE) | |
1190 | { | |
1191 | /* Warn for integer types converted to smaller integer types. */ | |
1192 | if (formal_prec < TYPE_PRECISION (TREE_TYPE (expr)) | |
1193 | /* When they are the same width but different signedness, | |
1194 | then the value may change. */ | |
1195 | || (formal_prec == TYPE_PRECISION (TREE_TYPE (expr)) | |
1196 | && TYPE_UNSIGNED (TREE_TYPE (expr)) != TYPE_UNSIGNED (type)) | |
1197 | /* Even when converted to a bigger type, if the type is | |
1198 | unsigned but expr is signed, then negative values | |
1199 | will be changed. */ | |
1200 | || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (TREE_TYPE (expr)))) | |
1201 | give_warning = true; | |
1202 | } | |
1203 | ||
1204 | /* Warn for integer types converted to real types if and only if | |
1205 | all the range of values of the integer type cannot be | |
1206 | represented by the real type. */ | |
1207 | else if (TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE | |
1208 | && TREE_CODE (type) == REAL_TYPE) | |
1209 | { | |
1210 | tree type_low_bound = TYPE_MIN_VALUE (TREE_TYPE (expr)); | |
1211 | tree type_high_bound = TYPE_MAX_VALUE (TREE_TYPE (expr)); | |
1212 | REAL_VALUE_TYPE real_low_bound = real_value_from_int_cst (0, type_low_bound); | |
1213 | REAL_VALUE_TYPE real_high_bound = real_value_from_int_cst (0, type_high_bound); | |
1214 | ||
1215 | if (!exact_real_truncate (TYPE_MODE (type), &real_low_bound) | |
1216 | || !exact_real_truncate (TYPE_MODE (type), &real_high_bound)) | |
1217 | give_warning = true; | |
1218 | } | |
1219 | ||
1220 | /* Warn for real types converted to smaller real types. */ | |
1221 | else if (TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE | |
1222 | && TREE_CODE (type) == REAL_TYPE | |
1223 | && formal_prec < TYPE_PRECISION (TREE_TYPE (expr))) | |
1224 | give_warning = true; | |
1225 | ||
1226 | ||
1227 | if (give_warning) | |
1228 | warning (OPT_Wconversion, | |
1229 | "conversion to %qT from %qT may alter its value", | |
1230 | type, TREE_TYPE (expr)); | |
1231 | } | |
1232 | } | |
1233 | ||
2a1736ed | 1234 | /* Convert EXPR to TYPE, warning about conversion problems with constants. |
1235 | Invoke this function on every expression that is converted implicitly, | |
1236 | i.e. because of language rules and not because of an explicit cast. */ | |
1237 | ||
1238 | tree | |
1cae46be | 1239 | convert_and_check (tree type, tree expr) |
2a1736ed | 1240 | { |
da1fb07b | 1241 | tree result; |
1242 | ||
1243 | if (TREE_TYPE (expr) == type) | |
1244 | return expr; | |
1245 | ||
1246 | result = convert (type, expr); | |
1247 | ||
1248 | if (skip_evaluation) | |
1249 | return result; | |
1250 | ||
d31d55f0 | 1251 | |
da1fb07b | 1252 | if (TREE_CODE (expr) == INTEGER_CST |
1253 | && (TREE_CODE (type) == INTEGER_TYPE | |
1254 | || TREE_CODE (type) == ENUMERAL_TYPE) | |
1255 | && !int_fits_type_p (expr, type)) | |
1256 | { | |
d31d55f0 | 1257 | /* Do not diagnose overflow in a constant expression merely |
1258 | because a conversion overflowed. */ | |
da1fb07b | 1259 | if (TREE_OVERFLOW (result)) |
eddad94a | 1260 | TREE_OVERFLOW (result) = TREE_OVERFLOW (expr); |
1261 | ||
da1fb07b | 1262 | if (TYPE_UNSIGNED (type)) |
d31d55f0 | 1263 | { |
da1fb07b | 1264 | /* This detects cases like converting -129 or 256 to |
1265 | unsigned char. */ | |
1266 | if (!int_fits_type_p (expr, c_common_signed_type (type))) | |
1267 | warning (OPT_Woverflow, | |
1268 | "large integer implicitly truncated to unsigned type"); | |
1269 | else if (warn_conversion) | |
1270 | conversion_warning (type, expr); | |
1271 | } | |
1272 | else | |
1273 | { | |
1274 | if (!int_fits_type_p (expr, c_common_unsigned_type (type))) | |
1275 | warning (OPT_Woverflow, | |
1276 | "overflow in implicit constant conversion"); | |
1277 | /* No warning for converting 0x80000000 to int. */ | |
1278 | else if (pedantic | |
1279 | && (TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE | |
1280 | || TYPE_PRECISION (TREE_TYPE (expr)) | |
1281 | != TYPE_PRECISION (type))) | |
d31d55f0 | 1282 | warning (OPT_Woverflow, |
1283 | "overflow in implicit constant conversion"); | |
da1fb07b | 1284 | else if (warn_conversion) |
1285 | conversion_warning (type, expr); | |
d31d55f0 | 1286 | } |
2a1736ed | 1287 | } |
da1fb07b | 1288 | else if (TREE_CODE (result) == INTEGER_CST && TREE_OVERFLOW (result)) |
1289 | warning (OPT_Woverflow, | |
1290 | "overflow in implicit constant conversion"); | |
1291 | else if (warn_conversion) | |
1292 | conversion_warning (type, expr); | |
1293 | ||
1294 | return result; | |
b2806639 | 1295 | } |
1296 | \f | |
4e91a871 | 1297 | /* A node in a list that describes references to variables (EXPR), which are |
1298 | either read accesses if WRITER is zero, or write accesses, in which case | |
1299 | WRITER is the parent of EXPR. */ | |
1300 | struct tlist | |
1301 | { | |
1302 | struct tlist *next; | |
1303 | tree expr, writer; | |
1304 | }; | |
1305 | ||
1306 | /* Used to implement a cache the results of a call to verify_tree. We only | |
1307 | use this for SAVE_EXPRs. */ | |
1308 | struct tlist_cache | |
1309 | { | |
1310 | struct tlist_cache *next; | |
1311 | struct tlist *cache_before_sp; | |
1312 | struct tlist *cache_after_sp; | |
1313 | tree expr; | |
481c6ce6 | 1314 | }; |
1315 | ||
4e91a871 | 1316 | /* Obstack to use when allocating tlist structures, and corresponding |
1317 | firstobj. */ | |
1318 | static struct obstack tlist_obstack; | |
1319 | static char *tlist_firstobj = 0; | |
1320 | ||
1321 | /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
1322 | warnings. */ | |
1323 | static struct tlist *warned_ids; | |
1324 | /* SAVE_EXPRs need special treatment. We process them only once and then | |
1325 | cache the results. */ | |
1326 | static struct tlist_cache *save_expr_cache; | |
1327 | ||
1cae46be | 1328 | static void add_tlist (struct tlist **, struct tlist *, tree, int); |
1329 | static void merge_tlist (struct tlist **, struct tlist *, int); | |
1330 | static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
1331 | static int warning_candidate_p (tree); | |
1332 | static void warn_for_collisions (struct tlist *); | |
1333 | static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
1334 | static struct tlist *new_tlist (struct tlist *, tree, tree); | |
481c6ce6 | 1335 | |
4e91a871 | 1336 | /* Create a new struct tlist and fill in its fields. */ |
1337 | static struct tlist * | |
1cae46be | 1338 | new_tlist (struct tlist *next, tree t, tree writer) |
4e91a871 | 1339 | { |
1340 | struct tlist *l; | |
9318f22c | 1341 | l = XOBNEW (&tlist_obstack, struct tlist); |
4e91a871 | 1342 | l->next = next; |
1343 | l->expr = t; | |
1344 | l->writer = writer; | |
1345 | return l; | |
1346 | } | |
1347 | ||
1348 | /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
1349 | is nonnull, we ignore any node we find which has a writer equal to it. */ | |
1350 | ||
1351 | static void | |
1cae46be | 1352 | add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) |
4e91a871 | 1353 | { |
1354 | while (add) | |
1355 | { | |
1356 | struct tlist *next = add->next; | |
84166705 | 1357 | if (!copy) |
4e91a871 | 1358 | add->next = *to; |
84166705 | 1359 | if (!exclude_writer || add->writer != exclude_writer) |
4e91a871 | 1360 | *to = copy ? new_tlist (*to, add->expr, add->writer) : add; |
1361 | add = next; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | /* Merge the nodes of ADD into TO. This merging process is done so that for | |
1366 | each variable that already exists in TO, no new node is added; however if | |
1367 | there is a write access recorded in ADD, and an occurrence on TO is only | |
1368 | a read access, then the occurrence in TO will be modified to record the | |
1369 | write. */ | |
481c6ce6 | 1370 | |
1371 | static void | |
1cae46be | 1372 | merge_tlist (struct tlist **to, struct tlist *add, int copy) |
4e91a871 | 1373 | { |
1374 | struct tlist **end = to; | |
1375 | ||
1376 | while (*end) | |
1377 | end = &(*end)->next; | |
1378 | ||
1379 | while (add) | |
1380 | { | |
1381 | int found = 0; | |
1382 | struct tlist *tmp2; | |
1383 | struct tlist *next = add->next; | |
1384 | ||
1385 | for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
1386 | if (tmp2->expr == add->expr) | |
1387 | { | |
1388 | found = 1; | |
84166705 | 1389 | if (!tmp2->writer) |
4e91a871 | 1390 | tmp2->writer = add->writer; |
1391 | } | |
84166705 | 1392 | if (!found) |
4e91a871 | 1393 | { |
1394 | *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
1395 | end = &(*end)->next; | |
1396 | *end = 0; | |
1397 | } | |
1398 | add = next; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
1403 | references in list LIST conflict with it, excluding reads if ONLY writers | |
1404 | is nonzero. */ | |
1405 | ||
1406 | static void | |
1cae46be | 1407 | warn_for_collisions_1 (tree written, tree writer, struct tlist *list, |
1408 | int only_writes) | |
4e91a871 | 1409 | { |
1410 | struct tlist *tmp; | |
1411 | ||
1412 | /* Avoid duplicate warnings. */ | |
1413 | for (tmp = warned_ids; tmp; tmp = tmp->next) | |
1414 | if (tmp->expr == written) | |
1415 | return; | |
1416 | ||
1417 | while (list) | |
1418 | { | |
1419 | if (list->expr == written | |
1420 | && list->writer != writer | |
84166705 | 1421 | && (!only_writes || list->writer) |
e4323659 | 1422 | && DECL_NAME (list->expr)) |
4e91a871 | 1423 | { |
1424 | warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
c3ceba8e | 1425 | warning (0, "operation on %qE may be undefined", list->expr); |
4e91a871 | 1426 | } |
1427 | list = list->next; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* Given a list LIST of references to variables, find whether any of these | |
1432 | can cause conflicts due to missing sequence points. */ | |
1433 | ||
1434 | static void | |
1cae46be | 1435 | warn_for_collisions (struct tlist *list) |
4e91a871 | 1436 | { |
1437 | struct tlist *tmp; | |
1cae46be | 1438 | |
4e91a871 | 1439 | for (tmp = list; tmp; tmp = tmp->next) |
1440 | { | |
1441 | if (tmp->writer) | |
1442 | warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
1443 | } | |
1444 | } | |
1445 | ||
734c98be | 1446 | /* Return nonzero if X is a tree that can be verified by the sequence point |
4e91a871 | 1447 | warnings. */ |
1448 | static int | |
1cae46be | 1449 | warning_candidate_p (tree x) |
481c6ce6 | 1450 | { |
4e91a871 | 1451 | return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL; |
1452 | } | |
481c6ce6 | 1453 | |
4e91a871 | 1454 | /* Walk the tree X, and record accesses to variables. If X is written by the |
1455 | parent tree, WRITER is the parent. | |
1456 | We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
1457 | expression or its only operand forces a sequence point, then everything up | |
1458 | to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
1459 | in PNO_SP. | |
1460 | Once we return, we will have emitted warnings if any subexpression before | |
1461 | such a sequence point could be undefined. On a higher level, however, the | |
1462 | sequence point may not be relevant, and we'll merge the two lists. | |
1463 | ||
1464 | Example: (b++, a) + b; | |
1465 | The call that processes the COMPOUND_EXPR will store the increment of B | |
1466 | in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
1467 | processes the PLUS_EXPR will need to merge the two lists so that | |
1468 | eventually, all accesses end up on the same list (and we'll warn about the | |
1469 | unordered subexpressions b++ and b. | |
1470 | ||
1471 | A note on merging. If we modify the former example so that our expression | |
1472 | becomes | |
1473 | (b++, b) + a | |
1474 | care must be taken not simply to add all three expressions into the final | |
1475 | PNO_SP list. The function merge_tlist takes care of that by merging the | |
1476 | before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
1477 | way, so that no more than one access to B is recorded. */ | |
481c6ce6 | 1478 | |
4e91a871 | 1479 | static void |
1cae46be | 1480 | verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, |
1481 | tree writer) | |
4e91a871 | 1482 | { |
1483 | struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
1484 | enum tree_code code; | |
ce45a448 | 1485 | enum tree_code_class cl; |
481c6ce6 | 1486 | |
e5b75768 | 1487 | /* X may be NULL if it is the operand of an empty statement expression |
1488 | ({ }). */ | |
1489 | if (x == NULL) | |
1490 | return; | |
1491 | ||
4e91a871 | 1492 | restart: |
1493 | code = TREE_CODE (x); | |
e916c70c | 1494 | cl = TREE_CODE_CLASS (code); |
481c6ce6 | 1495 | |
4e91a871 | 1496 | if (warning_candidate_p (x)) |
481c6ce6 | 1497 | { |
4e91a871 | 1498 | *pno_sp = new_tlist (*pno_sp, x, writer); |
1499 | return; | |
1500 | } | |
1501 | ||
1502 | switch (code) | |
1503 | { | |
67b28e3e | 1504 | case CONSTRUCTOR: |
1505 | return; | |
1506 | ||
4e91a871 | 1507 | case COMPOUND_EXPR: |
1508 | case TRUTH_ANDIF_EXPR: | |
1509 | case TRUTH_ORIF_EXPR: | |
1510 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1511 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1512 | warn_for_collisions (tmp_nosp); | |
1513 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1514 | merge_tlist (pbefore_sp, tmp_nosp, 0); | |
1515 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
1516 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1517 | return; | |
1518 | ||
1519 | case COND_EXPR: | |
1520 | tmp_before = tmp_list2 = 0; | |
1521 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
1522 | warn_for_collisions (tmp_list2); | |
1523 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1524 | merge_tlist (pbefore_sp, tmp_list2, 1); | |
1525 | ||
1526 | tmp_list3 = tmp_nosp = 0; | |
1527 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
1528 | warn_for_collisions (tmp_nosp); | |
1529 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1530 | ||
1531 | tmp_list3 = tmp_list2 = 0; | |
1532 | verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
1533 | warn_for_collisions (tmp_list2); | |
1534 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1535 | /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
1536 | two first, to avoid warning for (a ? b++ : b++). */ | |
1537 | merge_tlist (&tmp_nosp, tmp_list2, 0); | |
1538 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1539 | return; | |
1540 | ||
481c6ce6 | 1541 | case PREDECREMENT_EXPR: |
1542 | case PREINCREMENT_EXPR: | |
1543 | case POSTDECREMENT_EXPR: | |
1544 | case POSTINCREMENT_EXPR: | |
4e91a871 | 1545 | verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); |
1546 | return; | |
1547 | ||
1548 | case MODIFY_EXPR: | |
1549 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1550 | verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
1551 | verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
1552 | /* Expressions inside the LHS are not ordered wrt. the sequence points | |
1553 | in the RHS. Example: | |
1554 | *a = (a++, 2) | |
1555 | Despite the fact that the modification of "a" is in the before_sp | |
1556 | list (tmp_before), it conflicts with the use of "a" in the LHS. | |
1557 | We can handle this by adding the contents of tmp_list3 | |
1558 | to those of tmp_before, and redoing the collision warnings for that | |
1559 | list. */ | |
1560 | add_tlist (&tmp_before, tmp_list3, x, 1); | |
1561 | warn_for_collisions (tmp_before); | |
1562 | /* Exclude the LHS itself here; we first have to merge it into the | |
1563 | tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
1564 | didn't exclude the LHS, we'd get it twice, once as a read and once | |
1565 | as a write. */ | |
1566 | add_tlist (pno_sp, tmp_list3, x, 0); | |
1567 | warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
1568 | ||
1569 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1570 | if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
1571 | merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
1572 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
1573 | return; | |
481c6ce6 | 1574 | |
1575 | case CALL_EXPR: | |
4e91a871 | 1576 | /* We need to warn about conflicts among arguments and conflicts between |
1577 | args and the function address. Side effects of the function address, | |
1578 | however, are not ordered by the sequence point of the call. */ | |
1579 | tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0; | |
1580 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1581 | if (TREE_OPERAND (x, 1)) | |
1582 | verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE); | |
1583 | merge_tlist (&tmp_list3, tmp_list2, 0); | |
1584 | add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
1585 | add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
1586 | warn_for_collisions (tmp_before); | |
1587 | add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
1588 | return; | |
481c6ce6 | 1589 | |
1590 | case TREE_LIST: | |
1591 | /* Scan all the list, e.g. indices of multi dimensional array. */ | |
1592 | while (x) | |
1593 | { | |
4e91a871 | 1594 | tmp_before = tmp_nosp = 0; |
1595 | verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
1596 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1597 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
481c6ce6 | 1598 | x = TREE_CHAIN (x); |
1599 | } | |
4e91a871 | 1600 | return; |
481c6ce6 | 1601 | |
4e91a871 | 1602 | case SAVE_EXPR: |
1603 | { | |
1604 | struct tlist_cache *t; | |
1605 | for (t = save_expr_cache; t; t = t->next) | |
1606 | if (t->expr == x) | |
1607 | break; | |
481c6ce6 | 1608 | |
84166705 | 1609 | if (!t) |
481c6ce6 | 1610 | { |
9318f22c | 1611 | t = XOBNEW (&tlist_obstack, struct tlist_cache); |
4e91a871 | 1612 | t->next = save_expr_cache; |
1613 | t->expr = x; | |
1614 | save_expr_cache = t; | |
1615 | ||
1616 | tmp_before = tmp_nosp = 0; | |
1617 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1618 | warn_for_collisions (tmp_nosp); | |
1619 | ||
1620 | tmp_list3 = 0; | |
1621 | while (tmp_nosp) | |
1622 | { | |
1623 | struct tlist *t = tmp_nosp; | |
1624 | tmp_nosp = t->next; | |
1625 | merge_tlist (&tmp_list3, t, 0); | |
1626 | } | |
1627 | t->cache_before_sp = tmp_before; | |
1628 | t->cache_after_sp = tmp_list3; | |
481c6ce6 | 1629 | } |
4e91a871 | 1630 | merge_tlist (pbefore_sp, t->cache_before_sp, 1); |
1631 | add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
1632 | return; | |
1633 | } | |
481c6ce6 | 1634 | |
ce45a448 | 1635 | default: |
1636 | /* For other expressions, simply recurse on their operands. | |
a0c938f0 | 1637 | Manual tail recursion for unary expressions. |
ce45a448 | 1638 | Other non-expressions need not be processed. */ |
1639 | if (cl == tcc_unary) | |
1640 | { | |
ce45a448 | 1641 | x = TREE_OPERAND (x, 0); |
1642 | writer = 0; | |
1643 | goto restart; | |
1644 | } | |
1645 | else if (IS_EXPR_CODE_CLASS (cl)) | |
1646 | { | |
1647 | int lp; | |
651396d6 | 1648 | int max = TREE_CODE_LENGTH (TREE_CODE (x)); |
ce45a448 | 1649 | for (lp = 0; lp < max; lp++) |
1650 | { | |
1651 | tmp_before = tmp_nosp = 0; | |
1652 | verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0); | |
1653 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1654 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1655 | } | |
1656 | } | |
1657 | return; | |
481c6ce6 | 1658 | } |
481c6ce6 | 1659 | } |
1660 | ||
974e2c0c | 1661 | /* Try to warn for undefined behavior in EXPR due to missing sequence |
481c6ce6 | 1662 | points. */ |
1663 | ||
2569a1be | 1664 | void |
1cae46be | 1665 | verify_sequence_points (tree expr) |
481c6ce6 | 1666 | { |
4e91a871 | 1667 | struct tlist *before_sp = 0, *after_sp = 0; |
481c6ce6 | 1668 | |
4e91a871 | 1669 | warned_ids = 0; |
1670 | save_expr_cache = 0; | |
1671 | if (tlist_firstobj == 0) | |
481c6ce6 | 1672 | { |
4e91a871 | 1673 | gcc_obstack_init (&tlist_obstack); |
4fd61bc6 | 1674 | tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0); |
481c6ce6 | 1675 | } |
1676 | ||
4e91a871 | 1677 | verify_tree (expr, &before_sp, &after_sp, 0); |
1678 | warn_for_collisions (after_sp); | |
1679 | obstack_free (&tlist_obstack, tlist_firstobj); | |
481c6ce6 | 1680 | } |
b0fc3e72 | 1681 | \f |
1682 | /* Validate the expression after `case' and apply default promotions. */ | |
1683 | ||
2ca392fd | 1684 | static tree |
1cae46be | 1685 | check_case_value (tree value) |
b0fc3e72 | 1686 | { |
1687 | if (value == NULL_TREE) | |
1688 | return value; | |
1689 | ||
a97c952c | 1690 | /* ??? Can we ever get nops here for a valid case value? We |
1691 | shouldn't for C. */ | |
fce1d6af | 1692 | STRIP_TYPE_NOPS (value); |
225ec6aa | 1693 | /* In C++, the following is allowed: |
1694 | ||
1695 | const int i = 3; | |
1696 | switch (...) { case i: ... } | |
1697 | ||
1698 | So, we try to reduce the VALUE to a constant that way. */ | |
c0f19401 | 1699 | if (c_dialect_cxx ()) |
225ec6aa | 1700 | { |
1701 | value = decl_constant_value (value); | |
1702 | STRIP_TYPE_NOPS (value); | |
1703 | value = fold (value); | |
1704 | } | |
b0fc3e72 | 1705 | |
b96dc121 | 1706 | if (TREE_CODE (value) == INTEGER_CST) |
1707 | /* Promote char or short to int. */ | |
1708 | value = perform_integral_promotions (value); | |
1709 | else if (value != error_mark_node) | |
b0fc3e72 | 1710 | { |
1711 | error ("case label does not reduce to an integer constant"); | |
1712 | value = error_mark_node; | |
1713 | } | |
b0fc3e72 | 1714 | |
6433f1c2 | 1715 | constant_expression_warning (value); |
1716 | ||
b0fc3e72 | 1717 | return value; |
1718 | } | |
1719 | \f | |
2ca392fd | 1720 | /* See if the case values LOW and HIGH are in the range of the original |
5c9dae64 | 1721 | type (i.e. before the default conversion to int) of the switch testing |
2ca392fd | 1722 | expression. |
1723 | TYPE is the promoted type of the testing expression, and ORIG_TYPE is | |
91275768 | 1724 | the type before promoting it. CASE_LOW_P is a pointer to the lower |
2ca392fd | 1725 | bound of the case label, and CASE_HIGH_P is the upper bound or NULL |
1726 | if the case is not a case range. | |
1727 | The caller has to make sure that we are not called with NULL for | |
5c9dae64 | 1728 | CASE_LOW_P (i.e. the default case). |
442e3cb9 | 1729 | Returns true if the case label is in range of ORIG_TYPE (saturated or |
2ca392fd | 1730 | untouched) or false if the label is out of range. */ |
1731 | ||
1732 | static bool | |
1733 | check_case_bounds (tree type, tree orig_type, | |
1734 | tree *case_low_p, tree *case_high_p) | |
1735 | { | |
1736 | tree min_value, max_value; | |
1737 | tree case_low = *case_low_p; | |
1738 | tree case_high = case_high_p ? *case_high_p : case_low; | |
1739 | ||
1740 | /* If there was a problem with the original type, do nothing. */ | |
1741 | if (orig_type == error_mark_node) | |
1742 | return true; | |
1743 | ||
1744 | min_value = TYPE_MIN_VALUE (orig_type); | |
1745 | max_value = TYPE_MAX_VALUE (orig_type); | |
1746 | ||
1747 | /* Case label is less than minimum for type. */ | |
1748 | if (tree_int_cst_compare (case_low, min_value) < 0 | |
1749 | && tree_int_cst_compare (case_high, min_value) < 0) | |
1750 | { | |
c3ceba8e | 1751 | warning (0, "case label value is less than minimum value for type"); |
2ca392fd | 1752 | return false; |
1753 | } | |
b27ac6b5 | 1754 | |
2ca392fd | 1755 | /* Case value is greater than maximum for type. */ |
1756 | if (tree_int_cst_compare (case_low, max_value) > 0 | |
1757 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1758 | { | |
c3ceba8e | 1759 | warning (0, "case label value exceeds maximum value for type"); |
2ca392fd | 1760 | return false; |
1761 | } | |
1762 | ||
1763 | /* Saturate lower case label value to minimum. */ | |
1764 | if (tree_int_cst_compare (case_high, min_value) >= 0 | |
1765 | && tree_int_cst_compare (case_low, min_value) < 0) | |
1766 | { | |
c3ceba8e | 1767 | warning (0, "lower value in case label range" |
2ca392fd | 1768 | " less than minimum value for type"); |
1769 | case_low = min_value; | |
1770 | } | |
b27ac6b5 | 1771 | |
2ca392fd | 1772 | /* Saturate upper case label value to maximum. */ |
1773 | if (tree_int_cst_compare (case_low, max_value) <= 0 | |
1774 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1775 | { | |
c3ceba8e | 1776 | warning (0, "upper value in case label range" |
2ca392fd | 1777 | " exceeds maximum value for type"); |
1778 | case_high = max_value; | |
1779 | } | |
1780 | ||
1781 | if (*case_low_p != case_low) | |
1782 | *case_low_p = convert (type, case_low); | |
1783 | if (case_high_p && *case_high_p != case_high) | |
1784 | *case_high_p = convert (type, case_high); | |
1785 | ||
1786 | return true; | |
1787 | } | |
1788 | \f | |
b0fc3e72 | 1789 | /* Return an integer type with BITS bits of precision, |
1790 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
1791 | ||
1792 | tree | |
1cae46be | 1793 | c_common_type_for_size (unsigned int bits, int unsignedp) |
b0fc3e72 | 1794 | { |
46375237 | 1795 | if (bits == TYPE_PRECISION (integer_type_node)) |
1796 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1797 | ||
bacde65a | 1798 | if (bits == TYPE_PRECISION (signed_char_type_node)) |
b0fc3e72 | 1799 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
1800 | ||
bacde65a | 1801 | if (bits == TYPE_PRECISION (short_integer_type_node)) |
b0fc3e72 | 1802 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
1803 | ||
bacde65a | 1804 | if (bits == TYPE_PRECISION (long_integer_type_node)) |
b0fc3e72 | 1805 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
1806 | ||
bacde65a | 1807 | if (bits == TYPE_PRECISION (long_long_integer_type_node)) |
b0fc3e72 | 1808 | return (unsignedp ? long_long_unsigned_type_node |
1809 | : long_long_integer_type_node); | |
1810 | ||
f57fa2ea | 1811 | if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) |
1812 | return (unsignedp ? widest_unsigned_literal_type_node | |
1813 | : widest_integer_literal_type_node); | |
1814 | ||
bacde65a | 1815 | if (bits <= TYPE_PRECISION (intQI_type_node)) |
1816 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
1817 | ||
1818 | if (bits <= TYPE_PRECISION (intHI_type_node)) | |
1819 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
1820 | ||
1821 | if (bits <= TYPE_PRECISION (intSI_type_node)) | |
1822 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
1823 | ||
1824 | if (bits <= TYPE_PRECISION (intDI_type_node)) | |
1825 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
1826 | ||
b0fc3e72 | 1827 | return 0; |
1828 | } | |
1829 | ||
5b247e9f | 1830 | /* Used for communication between c_common_type_for_mode and |
1831 | c_register_builtin_type. */ | |
1832 | static GTY(()) tree registered_builtin_types; | |
1833 | ||
b0fc3e72 | 1834 | /* Return a data type that has machine mode MODE. |
1835 | If the mode is an integer, | |
1836 | then UNSIGNEDP selects between signed and unsigned types. */ | |
1837 | ||
1838 | tree | |
1cae46be | 1839 | c_common_type_for_mode (enum machine_mode mode, int unsignedp) |
b0fc3e72 | 1840 | { |
5b247e9f | 1841 | tree t; |
1842 | ||
46375237 | 1843 | if (mode == TYPE_MODE (integer_type_node)) |
1844 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1845 | ||
b0fc3e72 | 1846 | if (mode == TYPE_MODE (signed_char_type_node)) |
1847 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1848 | ||
1849 | if (mode == TYPE_MODE (short_integer_type_node)) | |
1850 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1851 | ||
b0fc3e72 | 1852 | if (mode == TYPE_MODE (long_integer_type_node)) |
1853 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1854 | ||
1855 | if (mode == TYPE_MODE (long_long_integer_type_node)) | |
1856 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
1857 | ||
f57fa2ea | 1858 | if (mode == TYPE_MODE (widest_integer_literal_type_node)) |
44e9fa65 | 1859 | return unsignedp ? widest_unsigned_literal_type_node |
4ee9c684 | 1860 | : widest_integer_literal_type_node; |
f57fa2ea | 1861 | |
88ae7f04 | 1862 | if (mode == QImode) |
bacde65a | 1863 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
1864 | ||
88ae7f04 | 1865 | if (mode == HImode) |
bacde65a | 1866 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
1867 | ||
88ae7f04 | 1868 | if (mode == SImode) |
bacde65a | 1869 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
1870 | ||
88ae7f04 | 1871 | if (mode == DImode) |
bacde65a | 1872 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
1873 | ||
cc1cc1c7 | 1874 | #if HOST_BITS_PER_WIDE_INT >= 64 |
6274009c | 1875 | if (mode == TYPE_MODE (intTI_type_node)) |
1876 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
cc1cc1c7 | 1877 | #endif |
6274009c | 1878 | |
b0fc3e72 | 1879 | if (mode == TYPE_MODE (float_type_node)) |
1880 | return float_type_node; | |
1881 | ||
1882 | if (mode == TYPE_MODE (double_type_node)) | |
1883 | return double_type_node; | |
1884 | ||
1885 | if (mode == TYPE_MODE (long_double_type_node)) | |
1886 | return long_double_type_node; | |
1887 | ||
545c2bde | 1888 | if (mode == TYPE_MODE (void_type_node)) |
1889 | return void_type_node; | |
b27ac6b5 | 1890 | |
b0fc3e72 | 1891 | if (mode == TYPE_MODE (build_pointer_type (char_type_node))) |
61b9b73c | 1892 | return (unsignedp |
1893 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
1894 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b0fc3e72 | 1895 | |
1896 | if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
61b9b73c | 1897 | return (unsignedp |
1898 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
1899 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b0fc3e72 | 1900 | |
0dfc45b5 | 1901 | if (COMPLEX_MODE_P (mode)) |
1902 | { | |
1903 | enum machine_mode inner_mode; | |
1904 | tree inner_type; | |
1905 | ||
1906 | if (mode == TYPE_MODE (complex_float_type_node)) | |
1907 | return complex_float_type_node; | |
1908 | if (mode == TYPE_MODE (complex_double_type_node)) | |
1909 | return complex_double_type_node; | |
1910 | if (mode == TYPE_MODE (complex_long_double_type_node)) | |
1911 | return complex_long_double_type_node; | |
1912 | ||
1913 | if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp) | |
1914 | return complex_integer_type_node; | |
1915 | ||
1916 | inner_mode = GET_MODE_INNER (mode); | |
1917 | inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1918 | if (inner_type != NULL_TREE) | |
1919 | return build_complex_type (inner_type); | |
1920 | } | |
1921 | else if (VECTOR_MODE_P (mode)) | |
4917c376 | 1922 | { |
1923 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
1924 | tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1925 | if (inner_type != NULL_TREE) | |
1926 | return build_vector_type_for_mode (inner_type, mode); | |
88ae7f04 | 1927 | } |
e2ea7e3a | 1928 | |
c4503c0a | 1929 | if (mode == TYPE_MODE (dfloat32_type_node)) |
1930 | return dfloat32_type_node; | |
1931 | if (mode == TYPE_MODE (dfloat64_type_node)) | |
1932 | return dfloat64_type_node; | |
1933 | if (mode == TYPE_MODE (dfloat128_type_node)) | |
1934 | return dfloat128_type_node; | |
1935 | ||
5b247e9f | 1936 | for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
1937 | if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
1938 | return TREE_VALUE (t); | |
1939 | ||
b0fc3e72 | 1940 | return 0; |
1941 | } | |
20d39783 | 1942 | |
2c0e001b | 1943 | /* Return an unsigned type the same as TYPE in other respects. */ |
20d39783 | 1944 | tree |
1cae46be | 1945 | c_common_unsigned_type (tree type) |
20d39783 | 1946 | { |
1947 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1948 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1949 | return unsigned_char_type_node; | |
1950 | if (type1 == integer_type_node) | |
1951 | return unsigned_type_node; | |
1952 | if (type1 == short_integer_type_node) | |
1953 | return short_unsigned_type_node; | |
1954 | if (type1 == long_integer_type_node) | |
1955 | return long_unsigned_type_node; | |
1956 | if (type1 == long_long_integer_type_node) | |
1957 | return long_long_unsigned_type_node; | |
1958 | if (type1 == widest_integer_literal_type_node) | |
1959 | return widest_unsigned_literal_type_node; | |
1960 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1961 | if (type1 == intTI_type_node) | |
1962 | return unsigned_intTI_type_node; | |
1963 | #endif | |
1964 | if (type1 == intDI_type_node) | |
1965 | return unsigned_intDI_type_node; | |
1966 | if (type1 == intSI_type_node) | |
1967 | return unsigned_intSI_type_node; | |
1968 | if (type1 == intHI_type_node) | |
1969 | return unsigned_intHI_type_node; | |
1970 | if (type1 == intQI_type_node) | |
1971 | return unsigned_intQI_type_node; | |
1972 | ||
4070745f | 1973 | return c_common_signed_or_unsigned_type (1, type); |
20d39783 | 1974 | } |
1975 | ||
1976 | /* Return a signed type the same as TYPE in other respects. */ | |
1977 | ||
1978 | tree | |
1cae46be | 1979 | c_common_signed_type (tree type) |
20d39783 | 1980 | { |
1981 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1982 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1983 | return signed_char_type_node; | |
1984 | if (type1 == unsigned_type_node) | |
1985 | return integer_type_node; | |
1986 | if (type1 == short_unsigned_type_node) | |
1987 | return short_integer_type_node; | |
1988 | if (type1 == long_unsigned_type_node) | |
1989 | return long_integer_type_node; | |
1990 | if (type1 == long_long_unsigned_type_node) | |
1991 | return long_long_integer_type_node; | |
1992 | if (type1 == widest_unsigned_literal_type_node) | |
1993 | return widest_integer_literal_type_node; | |
1994 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1995 | if (type1 == unsigned_intTI_type_node) | |
1996 | return intTI_type_node; | |
1997 | #endif | |
1998 | if (type1 == unsigned_intDI_type_node) | |
1999 | return intDI_type_node; | |
2000 | if (type1 == unsigned_intSI_type_node) | |
2001 | return intSI_type_node; | |
2002 | if (type1 == unsigned_intHI_type_node) | |
2003 | return intHI_type_node; | |
2004 | if (type1 == unsigned_intQI_type_node) | |
2005 | return intQI_type_node; | |
2006 | ||
4070745f | 2007 | return c_common_signed_or_unsigned_type (0, type); |
20d39783 | 2008 | } |
2009 | ||
2010 | /* Return a type the same as TYPE except unsigned or | |
2011 | signed according to UNSIGNEDP. */ | |
2012 | ||
2013 | tree | |
1cae46be | 2014 | c_common_signed_or_unsigned_type (int unsignedp, tree type) |
20d39783 | 2015 | { |
84166705 | 2016 | if (!INTEGRAL_TYPE_P (type) |
78a8ed03 | 2017 | || TYPE_UNSIGNED (type) == unsignedp) |
20d39783 | 2018 | return type; |
2019 | ||
4f7f7efd | 2020 | /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not |
2021 | the precision; they have precision set to match their range, but | |
2022 | may use a wider mode to match an ABI. If we change modes, we may | |
2023 | wind up with bad conversions. For INTEGER_TYPEs in C, must check | |
2024 | the precision as well, so as to yield correct results for | |
2025 | bit-field types. C++ does not have these separate bit-field | |
2026 | types, and producing a signed or unsigned variant of an | |
2027 | ENUMERAL_TYPE may cause other problems as well. */ | |
2028 | ||
2029 | #define TYPE_OK(node) \ | |
2030 | (TYPE_MODE (type) == TYPE_MODE (node) \ | |
2031 | && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node))) | |
2032 | if (TYPE_OK (signed_char_type_node)) | |
20d39783 | 2033 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
4f7f7efd | 2034 | if (TYPE_OK (integer_type_node)) |
20d39783 | 2035 | return unsignedp ? unsigned_type_node : integer_type_node; |
4f7f7efd | 2036 | if (TYPE_OK (short_integer_type_node)) |
20d39783 | 2037 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
4f7f7efd | 2038 | if (TYPE_OK (long_integer_type_node)) |
20d39783 | 2039 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
4f7f7efd | 2040 | if (TYPE_OK (long_long_integer_type_node)) |
20d39783 | 2041 | return (unsignedp ? long_long_unsigned_type_node |
2042 | : long_long_integer_type_node); | |
4f7f7efd | 2043 | if (TYPE_OK (widest_integer_literal_type_node)) |
20d39783 | 2044 | return (unsignedp ? widest_unsigned_literal_type_node |
2045 | : widest_integer_literal_type_node); | |
ef11801e | 2046 | |
2047 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
4f7f7efd | 2048 | if (TYPE_OK (intTI_type_node)) |
ef11801e | 2049 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; |
2050 | #endif | |
4f7f7efd | 2051 | if (TYPE_OK (intDI_type_node)) |
ef11801e | 2052 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
4f7f7efd | 2053 | if (TYPE_OK (intSI_type_node)) |
ef11801e | 2054 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
4f7f7efd | 2055 | if (TYPE_OK (intHI_type_node)) |
ef11801e | 2056 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
4f7f7efd | 2057 | if (TYPE_OK (intQI_type_node)) |
ef11801e | 2058 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
4f7f7efd | 2059 | #undef TYPE_OK |
ef11801e | 2060 | |
4f7f7efd | 2061 | if (c_dialect_cxx ()) |
2062 | return type; | |
2063 | else | |
2064 | return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); | |
20d39783 | 2065 | } |
b268e47e | 2066 | |
c0e47fd4 | 2067 | /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */ |
2068 | ||
2069 | tree | |
2070 | c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp) | |
2071 | { | |
2072 | /* Extended integer types of the same width as a standard type have | |
2073 | lesser rank, so those of the same width as int promote to int or | |
2074 | unsigned int and are valid for printf formats expecting int or | |
2075 | unsigned int. To avoid such special cases, avoid creating | |
2076 | extended integer types for bit-fields if a standard integer type | |
2077 | is available. */ | |
2078 | if (width == TYPE_PRECISION (integer_type_node)) | |
2079 | return unsignedp ? unsigned_type_node : integer_type_node; | |
2080 | if (width == TYPE_PRECISION (signed_char_type_node)) | |
2081 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
2082 | if (width == TYPE_PRECISION (short_integer_type_node)) | |
2083 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
2084 | if (width == TYPE_PRECISION (long_integer_type_node)) | |
2085 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
2086 | if (width == TYPE_PRECISION (long_long_integer_type_node)) | |
2087 | return (unsignedp ? long_long_unsigned_type_node | |
2088 | : long_long_integer_type_node); | |
2089 | return build_nonstandard_integer_type (width, unsignedp); | |
2090 | } | |
2091 | ||
b268e47e | 2092 | /* The C version of the register_builtin_type langhook. */ |
2093 | ||
2094 | void | |
2095 | c_register_builtin_type (tree type, const char* name) | |
2096 | { | |
2097 | tree decl; | |
2098 | ||
2099 | decl = build_decl (TYPE_DECL, get_identifier (name), type); | |
2100 | DECL_ARTIFICIAL (decl) = 1; | |
2101 | if (!TYPE_NAME (type)) | |
2102 | TYPE_NAME (type) = decl; | |
2103 | pushdecl (decl); | |
5b247e9f | 2104 | |
2105 | registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
b268e47e | 2106 | } |
2107 | ||
b0fc3e72 | 2108 | \f |
a9b9d10c | 2109 | /* Return the minimum number of bits needed to represent VALUE in a |
2110 | signed or unsigned type, UNSIGNEDP says which. */ | |
2111 | ||
a0c2c45b | 2112 | unsigned int |
1cae46be | 2113 | min_precision (tree value, int unsignedp) |
a9b9d10c | 2114 | { |
2115 | int log; | |
2116 | ||
2117 | /* If the value is negative, compute its negative minus 1. The latter | |
2118 | adjustment is because the absolute value of the largest negative value | |
2119 | is one larger than the largest positive value. This is equivalent to | |
2120 | a bit-wise negation, so use that operation instead. */ | |
2121 | ||
2122 | if (tree_int_cst_sgn (value) < 0) | |
49d00087 | 2123 | value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value); |
a9b9d10c | 2124 | |
2125 | /* Return the number of bits needed, taking into account the fact | |
2126 | that we need one more bit for a signed than unsigned type. */ | |
2127 | ||
2128 | if (integer_zerop (value)) | |
2129 | log = 0; | |
a9b9d10c | 2130 | else |
a0c2c45b | 2131 | log = tree_floor_log2 (value); |
a9b9d10c | 2132 | |
84166705 | 2133 | return log + 1 + !unsignedp; |
a9b9d10c | 2134 | } |
2135 | \f | |
aff9e656 | 2136 | /* Print an error message for invalid operands to arith operation |
c44afe23 | 2137 | CODE. */ |
b0fc3e72 | 2138 | |
2139 | void | |
1cae46be | 2140 | binary_op_error (enum tree_code code) |
b0fc3e72 | 2141 | { |
19cb6b50 | 2142 | const char *opname; |
f03946e4 | 2143 | |
b0fc3e72 | 2144 | switch (code) |
2145 | { | |
b0fc3e72 | 2146 | case PLUS_EXPR: |
2147 | opname = "+"; break; | |
2148 | case MINUS_EXPR: | |
2149 | opname = "-"; break; | |
2150 | case MULT_EXPR: | |
2151 | opname = "*"; break; | |
2152 | case MAX_EXPR: | |
2153 | opname = "max"; break; | |
2154 | case MIN_EXPR: | |
2155 | opname = "min"; break; | |
2156 | case EQ_EXPR: | |
2157 | opname = "=="; break; | |
2158 | case NE_EXPR: | |
2159 | opname = "!="; break; | |
2160 | case LE_EXPR: | |
2161 | opname = "<="; break; | |
2162 | case GE_EXPR: | |
2163 | opname = ">="; break; | |
2164 | case LT_EXPR: | |
2165 | opname = "<"; break; | |
2166 | case GT_EXPR: | |
2167 | opname = ">"; break; | |
2168 | case LSHIFT_EXPR: | |
2169 | opname = "<<"; break; | |
2170 | case RSHIFT_EXPR: | |
2171 | opname = ">>"; break; | |
2172 | case TRUNC_MOD_EXPR: | |
66618a1e | 2173 | case FLOOR_MOD_EXPR: |
b0fc3e72 | 2174 | opname = "%"; break; |
2175 | case TRUNC_DIV_EXPR: | |
66618a1e | 2176 | case FLOOR_DIV_EXPR: |
b0fc3e72 | 2177 | opname = "/"; break; |
2178 | case BIT_AND_EXPR: | |
2179 | opname = "&"; break; | |
2180 | case BIT_IOR_EXPR: | |
2181 | opname = "|"; break; | |
2182 | case TRUTH_ANDIF_EXPR: | |
2183 | opname = "&&"; break; | |
2184 | case TRUTH_ORIF_EXPR: | |
2185 | opname = "||"; break; | |
2186 | case BIT_XOR_EXPR: | |
2187 | opname = "^"; break; | |
31f820d2 | 2188 | default: |
315ba355 | 2189 | gcc_unreachable (); |
b0fc3e72 | 2190 | } |
2191 | error ("invalid operands to binary %s", opname); | |
2192 | } | |
2193 | \f | |
2194 | /* Subroutine of build_binary_op, used for comparison operations. | |
2195 | See if the operands have both been converted from subword integer types | |
2196 | and, if so, perhaps change them both back to their original type. | |
5b511807 | 2197 | This function is also responsible for converting the two operands |
2198 | to the proper common type for comparison. | |
b0fc3e72 | 2199 | |
2200 | The arguments of this function are all pointers to local variables | |
2201 | of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
2202 | RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
2203 | ||
2204 | If this function returns nonzero, it means that the comparison has | |
2205 | a constant value. What this function returns is an expression for | |
2206 | that value. */ | |
2207 | ||
2208 | tree | |
1cae46be | 2209 | shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, |
2210 | enum tree_code *rescode_ptr) | |
b0fc3e72 | 2211 | { |
19cb6b50 | 2212 | tree type; |
b0fc3e72 | 2213 | tree op0 = *op0_ptr; |
2214 | tree op1 = *op1_ptr; | |
2215 | int unsignedp0, unsignedp1; | |
2216 | int real1, real2; | |
2217 | tree primop0, primop1; | |
2218 | enum tree_code code = *rescode_ptr; | |
2219 | ||
2220 | /* Throw away any conversions to wider types | |
2221 | already present in the operands. */ | |
2222 | ||
2223 | primop0 = get_narrower (op0, &unsignedp0); | |
2224 | primop1 = get_narrower (op1, &unsignedp1); | |
2225 | ||
2226 | /* Handle the case that OP0 does not *contain* a conversion | |
2227 | but it *requires* conversion to FINAL_TYPE. */ | |
2228 | ||
2229 | if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
78a8ed03 | 2230 | unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
b0fc3e72 | 2231 | if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) |
78a8ed03 | 2232 | unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
b0fc3e72 | 2233 | |
2234 | /* If one of the operands must be floated, we cannot optimize. */ | |
2235 | real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
2236 | real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
2237 | ||
2238 | /* If first arg is constant, swap the args (changing operation | |
2bd278cc | 2239 | so value is preserved), for canonicalization. Don't do this if |
2240 | the second arg is 0. */ | |
b0fc3e72 | 2241 | |
2bd278cc | 2242 | if (TREE_CONSTANT (primop0) |
84166705 | 2243 | && !integer_zerop (primop1) && !real_zerop (primop1)) |
b0fc3e72 | 2244 | { |
19cb6b50 | 2245 | tree tem = primop0; |
2246 | int temi = unsignedp0; | |
b0fc3e72 | 2247 | primop0 = primop1; |
2248 | primop1 = tem; | |
2249 | tem = op0; | |
2250 | op0 = op1; | |
2251 | op1 = tem; | |
2252 | *op0_ptr = op0; | |
2253 | *op1_ptr = op1; | |
2254 | unsignedp0 = unsignedp1; | |
2255 | unsignedp1 = temi; | |
2256 | temi = real1; | |
2257 | real1 = real2; | |
2258 | real2 = temi; | |
2259 | ||
2260 | switch (code) | |
2261 | { | |
2262 | case LT_EXPR: | |
2263 | code = GT_EXPR; | |
2264 | break; | |
2265 | case GT_EXPR: | |
2266 | code = LT_EXPR; | |
2267 | break; | |
2268 | case LE_EXPR: | |
2269 | code = GE_EXPR; | |
2270 | break; | |
2271 | case GE_EXPR: | |
2272 | code = LE_EXPR; | |
2273 | break; | |
31f820d2 | 2274 | default: |
2275 | break; | |
b0fc3e72 | 2276 | } |
2277 | *rescode_ptr = code; | |
2278 | } | |
2279 | ||
2280 | /* If comparing an integer against a constant more bits wide, | |
2281 | maybe we can deduce a value of 1 or 0 independent of the data. | |
2282 | Or else truncate the constant now | |
2283 | rather than extend the variable at run time. | |
2284 | ||
2285 | This is only interesting if the constant is the wider arg. | |
2286 | Also, it is not safe if the constant is unsigned and the | |
2287 | variable arg is signed, since in this case the variable | |
2288 | would be sign-extended and then regarded as unsigned. | |
2289 | Our technique fails in this case because the lowest/highest | |
2290 | possible unsigned results don't follow naturally from the | |
2291 | lowest/highest possible values of the variable operand. | |
2292 | For just EQ_EXPR and NE_EXPR there is another technique that | |
2293 | could be used: see if the constant can be faithfully represented | |
2294 | in the other operand's type, by truncating it and reextending it | |
2295 | and see if that preserves the constant's value. */ | |
2296 | ||
2297 | if (!real1 && !real2 | |
2298 | && TREE_CODE (primop1) == INTEGER_CST | |
2299 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
2300 | { | |
2301 | int min_gt, max_gt, min_lt, max_lt; | |
2302 | tree maxval, minval; | |
2303 | /* 1 if comparison is nominally unsigned. */ | |
78a8ed03 | 2304 | int unsignedp = TYPE_UNSIGNED (*restype_ptr); |
b0fc3e72 | 2305 | tree val; |
2306 | ||
4070745f | 2307 | type = c_common_signed_or_unsigned_type (unsignedp0, |
2308 | TREE_TYPE (primop0)); | |
cda09c61 | 2309 | |
b0fc3e72 | 2310 | maxval = TYPE_MAX_VALUE (type); |
2311 | minval = TYPE_MIN_VALUE (type); | |
2312 | ||
2313 | if (unsignedp && !unsignedp0) | |
4070745f | 2314 | *restype_ptr = c_common_signed_type (*restype_ptr); |
b0fc3e72 | 2315 | |
2316 | if (TREE_TYPE (primop1) != *restype_ptr) | |
18dbec6f | 2317 | { |
9a5e8086 | 2318 | /* Convert primop1 to target type, but do not introduce |
2319 | additional overflow. We know primop1 is an int_cst. */ | |
c8110c8f | 2320 | primop1 = force_fit_type_double (*restype_ptr, |
2321 | TREE_INT_CST_LOW (primop1), | |
2322 | TREE_INT_CST_HIGH (primop1), 0, | |
eddad94a | 2323 | TREE_OVERFLOW (primop1)); |
18dbec6f | 2324 | } |
b0fc3e72 | 2325 | if (type != *restype_ptr) |
2326 | { | |
2327 | minval = convert (*restype_ptr, minval); | |
2328 | maxval = convert (*restype_ptr, maxval); | |
2329 | } | |
2330 | ||
2331 | if (unsignedp && unsignedp0) | |
2332 | { | |
2333 | min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
2334 | max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
2335 | min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
2336 | max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
2337 | } | |
2338 | else | |
2339 | { | |
2340 | min_gt = INT_CST_LT (primop1, minval); | |
2341 | max_gt = INT_CST_LT (primop1, maxval); | |
2342 | min_lt = INT_CST_LT (minval, primop1); | |
2343 | max_lt = INT_CST_LT (maxval, primop1); | |
2344 | } | |
2345 | ||
2346 | val = 0; | |
2347 | /* This used to be a switch, but Genix compiler can't handle that. */ | |
2348 | if (code == NE_EXPR) | |
2349 | { | |
2350 | if (max_lt || min_gt) | |
3c2239cf | 2351 | val = truthvalue_true_node; |
b0fc3e72 | 2352 | } |
2353 | else if (code == EQ_EXPR) | |
2354 | { | |
2355 | if (max_lt || min_gt) | |
3c2239cf | 2356 | val = truthvalue_false_node; |
b0fc3e72 | 2357 | } |
2358 | else if (code == LT_EXPR) | |
2359 | { | |
2360 | if (max_lt) | |
3c2239cf | 2361 | val = truthvalue_true_node; |
b0fc3e72 | 2362 | if (!min_lt) |
3c2239cf | 2363 | val = truthvalue_false_node; |
b0fc3e72 | 2364 | } |
2365 | else if (code == GT_EXPR) | |
2366 | { | |
2367 | if (min_gt) | |
3c2239cf | 2368 | val = truthvalue_true_node; |
b0fc3e72 | 2369 | if (!max_gt) |
3c2239cf | 2370 | val = truthvalue_false_node; |
b0fc3e72 | 2371 | } |
2372 | else if (code == LE_EXPR) | |
2373 | { | |
2374 | if (!max_gt) | |
3c2239cf | 2375 | val = truthvalue_true_node; |
b0fc3e72 | 2376 | if (min_gt) |
3c2239cf | 2377 | val = truthvalue_false_node; |
b0fc3e72 | 2378 | } |
2379 | else if (code == GE_EXPR) | |
2380 | { | |
2381 | if (!min_lt) | |
3c2239cf | 2382 | val = truthvalue_true_node; |
b0fc3e72 | 2383 | if (max_lt) |
3c2239cf | 2384 | val = truthvalue_false_node; |
b0fc3e72 | 2385 | } |
2386 | ||
2387 | /* If primop0 was sign-extended and unsigned comparison specd, | |
2388 | we did a signed comparison above using the signed type bounds. | |
2389 | But the comparison we output must be unsigned. | |
2390 | ||
2391 | Also, for inequalities, VAL is no good; but if the signed | |
2392 | comparison had *any* fixed result, it follows that the | |
2393 | unsigned comparison just tests the sign in reverse | |
2394 | (positive values are LE, negative ones GE). | |
2395 | So we can generate an unsigned comparison | |
2396 | against an extreme value of the signed type. */ | |
2397 | ||
2398 | if (unsignedp && !unsignedp0) | |
2399 | { | |
2400 | if (val != 0) | |
2401 | switch (code) | |
2402 | { | |
2403 | case LT_EXPR: | |
2404 | case GE_EXPR: | |
2405 | primop1 = TYPE_MIN_VALUE (type); | |
2406 | val = 0; | |
2407 | break; | |
2408 | ||
2409 | case LE_EXPR: | |
2410 | case GT_EXPR: | |
2411 | primop1 = TYPE_MAX_VALUE (type); | |
2412 | val = 0; | |
2413 | break; | |
31f820d2 | 2414 | |
2415 | default: | |
2416 | break; | |
b0fc3e72 | 2417 | } |
4070745f | 2418 | type = c_common_unsigned_type (type); |
b0fc3e72 | 2419 | } |
2420 | ||
fe5f2366 | 2421 | if (TREE_CODE (primop0) != INTEGER_CST) |
b0fc3e72 | 2422 | { |
3c2239cf | 2423 | if (val == truthvalue_false_node) |
c3ceba8e | 2424 | warning (0, "comparison is always false due to limited range of data type"); |
3c2239cf | 2425 | if (val == truthvalue_true_node) |
c3ceba8e | 2426 | warning (0, "comparison is always true due to limited range of data type"); |
b0fc3e72 | 2427 | } |
2428 | ||
2429 | if (val != 0) | |
2430 | { | |
2431 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2432 | if (TREE_SIDE_EFFECTS (primop0)) | |
14ae0310 | 2433 | return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); |
b0fc3e72 | 2434 | return val; |
2435 | } | |
2436 | ||
2437 | /* Value is not predetermined, but do the comparison | |
2438 | in the type of the operand that is not constant. | |
2439 | TYPE is already properly set. */ | |
2440 | } | |
c4503c0a | 2441 | |
2442 | /* If either arg is decimal float and the other is float, find the | |
2443 | proper common type to use for comparison. */ | |
2444 | else if (real1 && real2 | |
2445 | && (DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop0))) | |
2446 | || DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop1))))) | |
2447 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
2448 | ||
b0fc3e72 | 2449 | else if (real1 && real2 |
2203bd5c | 2450 | && (TYPE_PRECISION (TREE_TYPE (primop0)) |
2451 | == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
b0fc3e72 | 2452 | type = TREE_TYPE (primop0); |
2453 | ||
2454 | /* If args' natural types are both narrower than nominal type | |
2455 | and both extend in the same manner, compare them | |
2456 | in the type of the wider arg. | |
2457 | Otherwise must actually extend both to the nominal | |
2458 | common type lest different ways of extending | |
2459 | alter the result. | |
2460 | (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
2461 | ||
2462 | else if (unsignedp0 == unsignedp1 && real1 == real2 | |
2463 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
2464 | && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
2465 | { | |
2466 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
4070745f | 2467 | type = c_common_signed_or_unsigned_type (unsignedp0 |
78a8ed03 | 2468 | || TYPE_UNSIGNED (*restype_ptr), |
4070745f | 2469 | type); |
b0fc3e72 | 2470 | /* Make sure shorter operand is extended the right way |
2471 | to match the longer operand. */ | |
4070745f | 2472 | primop0 |
2473 | = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
2474 | TREE_TYPE (primop0)), | |
2475 | primop0); | |
2476 | primop1 | |
2477 | = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
2478 | TREE_TYPE (primop1)), | |
2479 | primop1); | |
b0fc3e72 | 2480 | } |
2481 | else | |
2482 | { | |
2483 | /* Here we must do the comparison on the nominal type | |
2484 | using the args exactly as we received them. */ | |
2485 | type = *restype_ptr; | |
2486 | primop0 = op0; | |
2487 | primop1 = op1; | |
2488 | ||
2489 | if (!real1 && !real2 && integer_zerop (primop1) | |
78a8ed03 | 2490 | && TYPE_UNSIGNED (*restype_ptr)) |
b0fc3e72 | 2491 | { |
2492 | tree value = 0; | |
2493 | switch (code) | |
2494 | { | |
2495 | case GE_EXPR: | |
2bd278cc | 2496 | /* All unsigned values are >= 0, so we warn if extra warnings |
2497 | are requested. However, if OP0 is a constant that is | |
2498 | >= 0, the signedness of the comparison isn't an issue, | |
2499 | so suppress the warning. */ | |
da99cd78 | 2500 | if (extra_warnings && !in_system_header |
84166705 | 2501 | && !(TREE_CODE (primop0) == INTEGER_CST |
2502 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
2503 | primop0)))) | |
c3ceba8e | 2504 | warning (0, "comparison of unsigned expression >= 0 is always true"); |
3c2239cf | 2505 | value = truthvalue_true_node; |
b0fc3e72 | 2506 | break; |
2507 | ||
2508 | case LT_EXPR: | |
da99cd78 | 2509 | if (extra_warnings && !in_system_header |
84166705 | 2510 | && !(TREE_CODE (primop0) == INTEGER_CST |
2511 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
2512 | primop0)))) | |
c3ceba8e | 2513 | warning (0, "comparison of unsigned expression < 0 is always false"); |
3c2239cf | 2514 | value = truthvalue_false_node; |
31f820d2 | 2515 | break; |
2516 | ||
2517 | default: | |
2518 | break; | |
b0fc3e72 | 2519 | } |
2520 | ||
2521 | if (value != 0) | |
2522 | { | |
2523 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2524 | if (TREE_SIDE_EFFECTS (primop0)) | |
14ae0310 | 2525 | return build2 (COMPOUND_EXPR, TREE_TYPE (value), |
2526 | primop0, value); | |
b0fc3e72 | 2527 | return value; |
2528 | } | |
2529 | } | |
2530 | } | |
2531 | ||
2532 | *op0_ptr = convert (type, primop0); | |
2533 | *op1_ptr = convert (type, primop1); | |
2534 | ||
3c2239cf | 2535 | *restype_ptr = truthvalue_type_node; |
b0fc3e72 | 2536 | |
2537 | return 0; | |
2538 | } | |
2539 | \f | |
1c26100f | 2540 | /* Return a tree for the sum or difference (RESULTCODE says which) |
2541 | of pointer PTROP and integer INTOP. */ | |
2542 | ||
2543 | tree | |
1cae46be | 2544 | pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop) |
1c26100f | 2545 | { |
2546 | tree size_exp; | |
2547 | ||
1c26100f | 2548 | /* The result is a pointer of the same type that is being added. */ |
2549 | ||
2550 | tree result_type = TREE_TYPE (ptrop); | |
2551 | ||
2552 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2553 | { | |
2554 | if (pedantic || warn_pointer_arith) | |
b0b1af64 | 2555 | pedwarn ("pointer of type %<void *%> used in arithmetic"); |
1c26100f | 2556 | size_exp = integer_one_node; |
2557 | } | |
2558 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2559 | { | |
2560 | if (pedantic || warn_pointer_arith) | |
2561 | pedwarn ("pointer to a function used in arithmetic"); | |
2562 | size_exp = integer_one_node; | |
2563 | } | |
2564 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
2565 | { | |
2566 | if (pedantic || warn_pointer_arith) | |
2567 | pedwarn ("pointer to member function used in arithmetic"); | |
2568 | size_exp = integer_one_node; | |
2569 | } | |
1c26100f | 2570 | else |
2571 | size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
2572 | ||
2573 | /* If what we are about to multiply by the size of the elements | |
2574 | contains a constant term, apply distributive law | |
2575 | and multiply that constant term separately. | |
2576 | This helps produce common subexpressions. */ | |
2577 | ||
2578 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
84166705 | 2579 | && !TREE_CONSTANT (intop) |
1c26100f | 2580 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) |
2581 | && TREE_CONSTANT (size_exp) | |
2582 | /* If the constant comes from pointer subtraction, | |
2583 | skip this optimization--it would cause an error. */ | |
2584 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
2585 | /* If the constant is unsigned, and smaller than the pointer size, | |
2586 | then we must skip this optimization. This is because it could cause | |
2587 | an overflow error if the constant is negative but INTOP is not. */ | |
84166705 | 2588 | && (!TYPE_UNSIGNED (TREE_TYPE (intop)) |
1c26100f | 2589 | || (TYPE_PRECISION (TREE_TYPE (intop)) |
2590 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
2591 | { | |
2592 | enum tree_code subcode = resultcode; | |
2593 | tree int_type = TREE_TYPE (intop); | |
2594 | if (TREE_CODE (intop) == MINUS_EXPR) | |
2595 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
2596 | /* Convert both subexpression types to the type of intop, | |
2597 | because weird cases involving pointer arithmetic | |
2598 | can result in a sum or difference with different type args. */ | |
2599 | ptrop = build_binary_op (subcode, ptrop, | |
2600 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2601 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
2602 | } | |
2603 | ||
2604 | /* Convert the integer argument to a type the same size as sizetype | |
2605 | so the multiply won't overflow spuriously. */ | |
2606 | ||
2607 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) | |
78a8ed03 | 2608 | || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) |
1cae46be | 2609 | intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), |
78a8ed03 | 2610 | TYPE_UNSIGNED (sizetype)), intop); |
1c26100f | 2611 | |
2612 | /* Replace the integer argument with a suitable product by the object size. | |
2613 | Do this multiplication as signed, then convert to the appropriate | |
2614 | pointer type (actually unsigned integral). */ | |
2615 | ||
2616 | intop = convert (result_type, | |
2617 | build_binary_op (MULT_EXPR, intop, | |
2618 | convert (TREE_TYPE (intop), size_exp), 1)); | |
2619 | ||
2620 | /* Create the sum or difference. */ | |
49d00087 | 2621 | return fold_build2 (resultcode, result_type, ptrop, intop); |
1c26100f | 2622 | } |
2623 | \f | |
6b68e71a | 2624 | /* Return whether EXPR is a declaration whose address can never be |
2625 | NULL. */ | |
2626 | ||
2627 | bool | |
2628 | decl_with_nonnull_addr_p (tree expr) | |
2629 | { | |
2630 | return (DECL_P (expr) | |
2631 | && (TREE_CODE (expr) == PARM_DECL | |
2632 | || TREE_CODE (expr) == LABEL_DECL | |
2633 | || !DECL_WEAK (expr))); | |
2634 | } | |
2635 | ||
b0fc3e72 | 2636 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
45a78cc0 | 2637 | or for an `if' or `while' statement or ?..: exp. It should already |
2638 | have been validated to be of suitable type; otherwise, a bad | |
2639 | diagnostic may result. | |
b0fc3e72 | 2640 | |
2641 | This preparation consists of taking the ordinary | |
2642 | representation of an expression expr and producing a valid tree | |
2643 | boolean expression describing whether expr is nonzero. We could | |
3c2239cf | 2644 | simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), |
b0fc3e72 | 2645 | but we optimize comparisons, &&, ||, and !. |
2646 | ||
3c2239cf | 2647 | The resulting type should always be `truthvalue_type_node'. */ |
b0fc3e72 | 2648 | |
2649 | tree | |
1cae46be | 2650 | c_common_truthvalue_conversion (tree expr) |
b0fc3e72 | 2651 | { |
b0fc3e72 | 2652 | switch (TREE_CODE (expr)) |
2653 | { | |
318a728f | 2654 | case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR: |
e1232ce2 | 2655 | case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: |
2656 | case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR: | |
2657 | case ORDERED_EXPR: case UNORDERED_EXPR: | |
ce04dcdc | 2658 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2659 | return expr; | |
2660 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
2661 | TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1)); | |
2662 | ||
b0fc3e72 | 2663 | case TRUTH_ANDIF_EXPR: |
2664 | case TRUTH_ORIF_EXPR: | |
2665 | case TRUTH_AND_EXPR: | |
2666 | case TRUTH_OR_EXPR: | |
31f6e93c | 2667 | case TRUTH_XOR_EXPR: |
ce04dcdc | 2668 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2669 | return expr; | |
2670 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
45a78cc0 | 2671 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2672 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1))); | |
3e851b85 | 2673 | |
f6e28f72 | 2674 | case TRUTH_NOT_EXPR: |
ce04dcdc | 2675 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2676 | return expr; | |
2677 | return build1 (TREE_CODE (expr), truthvalue_type_node, | |
45a78cc0 | 2678 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0))); |
f6e28f72 | 2679 | |
b0fc3e72 | 2680 | case ERROR_MARK: |
2681 | return expr; | |
2682 | ||
2683 | case INTEGER_CST: | |
eddad94a | 2684 | return integer_zerop (expr) ? truthvalue_false_node |
2685 | : truthvalue_true_node; | |
b0fc3e72 | 2686 | |
2687 | case REAL_CST: | |
5000e21c | 2688 | return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0) |
2689 | ? truthvalue_true_node | |
2690 | : truthvalue_false_node; | |
b0fc3e72 | 2691 | |
ce04dcdc | 2692 | case FUNCTION_DECL: |
2693 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
2694 | /* Fall through. */ | |
2695 | ||
b0fc3e72 | 2696 | case ADDR_EXPR: |
ce871053 | 2697 | { |
ee7d4d6a | 2698 | tree inner = TREE_OPERAND (expr, 0); |
6b68e71a | 2699 | if (decl_with_nonnull_addr_p (inner)) |
ce871053 | 2700 | { |
6b68e71a | 2701 | /* Common Ada/Pascal programmer's mistake. */ |
2702 | warning (OPT_Walways_true, | |
2703 | "the address of %qD will always evaluate as %<true%>", | |
ee7d4d6a | 2704 | inner); |
ce871053 | 2705 | return truthvalue_true_node; |
2706 | } | |
65b5e6a6 | 2707 | |
6b68e71a | 2708 | /* If we still have a decl, it is possible for its address to |
2709 | be NULL, so we cannot optimize. */ | |
2710 | if (DECL_P (inner)) | |
2711 | { | |
2712 | gcc_assert (DECL_WEAK (inner)); | |
2713 | break; | |
2714 | } | |
ce871053 | 2715 | |
ee7d4d6a | 2716 | if (TREE_SIDE_EFFECTS (inner)) |
14ae0310 | 2717 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
ee7d4d6a | 2718 | inner, truthvalue_true_node); |
ce871053 | 2719 | else |
2720 | return truthvalue_true_node; | |
2721 | } | |
b0fc3e72 | 2722 | |
2203bd5c | 2723 | case COMPLEX_EXPR: |
2ba726d2 | 2724 | return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) |
95809de4 | 2725 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
45a78cc0 | 2726 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2727 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1)), | |
2203bd5c | 2728 | 0); |
2729 | ||
b0fc3e72 | 2730 | case NEGATE_EXPR: |
2731 | case ABS_EXPR: | |
2732 | case FLOAT_EXPR: | |
d10cfa8d | 2733 | /* These don't change whether an object is nonzero or zero. */ |
45a78cc0 | 2734 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b0fc3e72 | 2735 | |
2736 | case LROTATE_EXPR: | |
2737 | case RROTATE_EXPR: | |
d10cfa8d | 2738 | /* These don't change whether an object is zero or nonzero, but |
b0fc3e72 | 2739 | we can't ignore them if their second arg has side-effects. */ |
2740 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
14ae0310 | 2741 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
2742 | TREE_OPERAND (expr, 1), | |
45a78cc0 | 2743 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0))); |
b0fc3e72 | 2744 | else |
45a78cc0 | 2745 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
73be5127 | 2746 | |
b0fc3e72 | 2747 | case COND_EXPR: |
2748 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
49d00087 | 2749 | return fold_build3 (COND_EXPR, truthvalue_type_node, |
14ae0310 | 2750 | TREE_OPERAND (expr, 0), |
45a78cc0 | 2751 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1)), |
49d00087 | 2752 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 2))); |
b0fc3e72 | 2753 | |
2754 | case CONVERT_EXPR: | |
c44afe23 | 2755 | case NOP_EXPR: |
b0fc3e72 | 2756 | /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, |
2757 | since that affects how `default_conversion' will behave. */ | |
2758 | if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
2759 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
2760 | break; | |
b0fc3e72 | 2761 | /* If this is widening the argument, we can ignore it. */ |
2762 | if (TYPE_PRECISION (TREE_TYPE (expr)) | |
2763 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
45a78cc0 | 2764 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b0fc3e72 | 2765 | break; |
2766 | ||
16837b18 | 2767 | case MODIFY_EXPR: |
60a0513e | 2768 | if (!TREE_NO_WARNING (expr) |
2769 | && warn_parentheses) | |
2770 | { | |
2771 | warning (OPT_Wparentheses, | |
2772 | "suggest parentheses around assignment used as truth value"); | |
2773 | TREE_NO_WARNING (expr) = 1; | |
2774 | } | |
16837b18 | 2775 | break; |
73be5127 | 2776 | |
31f820d2 | 2777 | default: |
2778 | break; | |
b0fc3e72 | 2779 | } |
2780 | ||
2ba726d2 | 2781 | if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) |
a0748b7d | 2782 | { |
aff9e656 | 2783 | tree t = save_expr (expr); |
a0748b7d | 2784 | return (build_binary_op |
2785 | ((TREE_SIDE_EFFECTS (expr) | |
2786 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
45a78cc0 | 2787 | c_common_truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)), |
2788 | c_common_truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)), | |
a0748b7d | 2789 | 0)); |
2790 | } | |
2ba726d2 | 2791 | |
b0fc3e72 | 2792 | return build_binary_op (NE_EXPR, expr, integer_zero_node, 1); |
2793 | } | |
2794 | \f | |
3237155d | 2795 | static void def_builtin_1 (enum built_in_function fncode, |
2796 | const char *name, | |
2797 | enum built_in_class fnclass, | |
2798 | tree fntype, tree libtype, | |
2799 | bool both_p, bool fallback_p, bool nonansi_p, | |
2800 | tree fnattrs, bool implicit_p); | |
0d4238dc | 2801 | |
ceee5ef4 | 2802 | /* Make a variant type in the proper way for C/C++, propagating qualifiers |
2803 | down to the element type of an array. */ | |
2804 | ||
2805 | tree | |
1cae46be | 2806 | c_build_qualified_type (tree type, int type_quals) |
ceee5ef4 | 2807 | { |
e4eabbe4 | 2808 | if (type == error_mark_node) |
2809 | return type; | |
b27ac6b5 | 2810 | |
adfb367f | 2811 | if (TREE_CODE (type) == ARRAY_TYPE) |
aebc8537 | 2812 | { |
2813 | tree t; | |
2814 | tree element_type = c_build_qualified_type (TREE_TYPE (type), | |
2815 | type_quals); | |
2816 | ||
2817 | /* See if we already have an identically qualified type. */ | |
2818 | for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) | |
2819 | { | |
2820 | if (TYPE_QUALS (strip_array_types (t)) == type_quals | |
2821 | && TYPE_NAME (t) == TYPE_NAME (type) | |
2822 | && TYPE_CONTEXT (t) == TYPE_CONTEXT (type) | |
2823 | && attribute_list_equal (TYPE_ATTRIBUTES (t), | |
2824 | TYPE_ATTRIBUTES (type))) | |
2825 | break; | |
2826 | } | |
2827 | if (!t) | |
2828 | { | |
2829 | t = build_variant_type_copy (type); | |
2830 | TREE_TYPE (t) = element_type; | |
2831 | } | |
2832 | return t; | |
2833 | } | |
adfb367f | 2834 | |
a5b1863e | 2835 | /* A restrict-qualified pointer type must be a pointer to object or |
2836 | incomplete type. Note that the use of POINTER_TYPE_P also allows | |
adfb367f | 2837 | REFERENCE_TYPEs, which is appropriate for C++. */ |
a5b1863e | 2838 | if ((type_quals & TYPE_QUAL_RESTRICT) |
2839 | && (!POINTER_TYPE_P (type) | |
2840 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
2841 | { | |
b0b1af64 | 2842 | error ("invalid use of %<restrict%>"); |
a5b1863e | 2843 | type_quals &= ~TYPE_QUAL_RESTRICT; |
2844 | } | |
2845 | ||
a5b1863e | 2846 | return build_qualified_type (type, type_quals); |
2847 | } | |
2848 | ||
2849 | /* Apply the TYPE_QUALS to the new DECL. */ | |
2850 | ||
2851 | void | |
1cae46be | 2852 | c_apply_type_quals_to_decl (int type_quals, tree decl) |
a5b1863e | 2853 | { |
adfb367f | 2854 | tree type = TREE_TYPE (decl); |
b27ac6b5 | 2855 | |
e4eabbe4 | 2856 | if (type == error_mark_node) |
2857 | return; | |
adfb367f | 2858 | |
2859 | if (((type_quals & TYPE_QUAL_CONST) | |
2860 | || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
2861 | /* An object declared 'const' is only readonly after it is | |
2862 | initialized. We don't have any way of expressing this currently, | |
2863 | so we need to be conservative and unset TREE_READONLY for types | |
2864 | with constructors. Otherwise aliasing code will ignore stores in | |
2865 | an inline constructor. */ | |
2866 | && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
a5b1863e | 2867 | TREE_READONLY (decl) = 1; |
2868 | if (type_quals & TYPE_QUAL_VOLATILE) | |
2869 | { | |
2870 | TREE_SIDE_EFFECTS (decl) = 1; | |
2871 | TREE_THIS_VOLATILE (decl) = 1; | |
2872 | } | |
d91a20bc | 2873 | if (type_quals & TYPE_QUAL_RESTRICT) |
a5b1863e | 2874 | { |
adfb367f | 2875 | while (type && TREE_CODE (type) == ARRAY_TYPE) |
2876 | /* Allow 'restrict' on arrays of pointers. | |
2877 | FIXME currently we just ignore it. */ | |
2878 | type = TREE_TYPE (type); | |
2879 | if (!type | |
2880 | || !POINTER_TYPE_P (type) | |
2881 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
b0b1af64 | 2882 | error ("invalid use of %<restrict%>"); |
adfb367f | 2883 | else if (flag_strict_aliasing && type == TREE_TYPE (decl)) |
ed83aafb | 2884 | /* Indicate we need to make a unique alias set for this pointer. |
2885 | We can't do it here because it might be pointing to an | |
2886 | incomplete type. */ | |
2887 | DECL_POINTER_ALIAS_SET (decl) = -2; | |
a5b1863e | 2888 | } |
2889 | } | |
2890 | ||
4ee9c684 | 2891 | /* Hash function for the problem of multiple type definitions in |
2892 | different files. This must hash all types that will compare | |
2893 | equal via comptypes to the same value. In practice it hashes | |
0bed3869 | 2894 | on some of the simple stuff and leaves the details to comptypes. */ |
4ee9c684 | 2895 | |
2896 | static hashval_t | |
2897 | c_type_hash (const void *p) | |
2898 | { | |
2899 | int i = 0; | |
2900 | int shift, size; | |
84166705 | 2901 | tree t = (tree) p; |
4ee9c684 | 2902 | tree t2; |
2903 | switch (TREE_CODE (t)) | |
2904 | { | |
fbf0afd1 | 2905 | /* For pointers, hash on pointee type plus some swizzling. */ |
2363ef00 | 2906 | case POINTER_TYPE: |
2907 | return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
2908 | /* Hash on number of elements and total size. */ | |
2909 | case ENUMERAL_TYPE: | |
2910 | shift = 3; | |
2911 | t2 = TYPE_VALUES (t); | |
2912 | break; | |
2913 | case RECORD_TYPE: | |
2914 | shift = 0; | |
2915 | t2 = TYPE_FIELDS (t); | |
2916 | break; | |
2917 | case QUAL_UNION_TYPE: | |
2918 | shift = 1; | |
2919 | t2 = TYPE_FIELDS (t); | |
2920 | break; | |
2921 | case UNION_TYPE: | |
2922 | shift = 2; | |
2923 | t2 = TYPE_FIELDS (t); | |
2924 | break; | |
2925 | default: | |
231bd014 | 2926 | gcc_unreachable (); |
4ee9c684 | 2927 | } |
2928 | for (; t2; t2 = TREE_CHAIN (t2)) | |
2929 | i++; | |
2930 | size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
2931 | return ((size << 24) | (i << shift)); | |
2932 | } | |
2933 | ||
1ecd4018 | 2934 | static GTY((param_is (union tree_node))) htab_t type_hash_table; |
2935 | ||
b5ba9f3a | 2936 | /* Return the typed-based alias set for T, which may be an expression |
f7c44134 | 2937 | or a type. Return -1 if we don't do anything special. */ |
b5ba9f3a | 2938 | |
f7c44134 | 2939 | HOST_WIDE_INT |
1cae46be | 2940 | c_common_get_alias_set (tree t) |
b5ba9f3a | 2941 | { |
be4f2de7 | 2942 | tree u; |
4ee9c684 | 2943 | PTR *slot; |
1cae46be | 2944 | |
be4f2de7 | 2945 | /* Permit type-punning when accessing a union, provided the access |
2946 | is directly through the union. For example, this code does not | |
2947 | permit taking the address of a union member and then storing | |
2948 | through it. Even the type-punning allowed here is a GCC | |
2949 | extension, albeit a common and useful one; the C standard says | |
2950 | that such accesses have implementation-defined behavior. */ | |
2951 | for (u = t; | |
2952 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
2953 | u = TREE_OPERAND (u, 0)) | |
2954 | if (TREE_CODE (u) == COMPONENT_REF | |
2955 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
2956 | return 0; | |
1e2513d9 | 2957 | |
9fcc3e54 | 2958 | /* That's all the expressions we handle specially. */ |
84166705 | 2959 | if (!TYPE_P (t)) |
9fcc3e54 | 2960 | return -1; |
2961 | ||
d716ce75 | 2962 | /* The C standard guarantees that any object may be accessed via an |
9fcc3e54 | 2963 | lvalue that has character type. */ |
2964 | if (t == char_type_node | |
2965 | || t == signed_char_type_node | |
2966 | || t == unsigned_char_type_node) | |
f7c44134 | 2967 | return 0; |
a5b1863e | 2968 | |
cb59f969 | 2969 | /* If it has the may_alias attribute, it can alias anything. */ |
9fcc3e54 | 2970 | if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t))) |
cb59f969 | 2971 | return 0; |
2972 | ||
1607663f | 2973 | /* The C standard specifically allows aliasing between signed and |
2974 | unsigned variants of the same type. We treat the signed | |
2975 | variant as canonical. */ | |
78a8ed03 | 2976 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) |
a8868e19 | 2977 | { |
4070745f | 2978 | tree t1 = c_common_signed_type (t); |
1607663f | 2979 | |
a8868e19 | 2980 | /* t1 == t can happen for boolean nodes which are always unsigned. */ |
2981 | if (t1 != t) | |
2982 | return get_alias_set (t1); | |
2983 | } | |
f7c44134 | 2984 | else if (POINTER_TYPE_P (t)) |
87d2d17e | 2985 | { |
f7c44134 | 2986 | tree t1; |
87d2d17e | 2987 | |
2988 | /* Unfortunately, there is no canonical form of a pointer type. | |
2989 | In particular, if we have `typedef int I', then `int *', and | |
2990 | `I *' are different types. So, we have to pick a canonical | |
2991 | representative. We do this below. | |
44e9fa65 | 2992 | |
40bdc593 | 2993 | Technically, this approach is actually more conservative that |
2994 | it needs to be. In particular, `const int *' and `int *' | |
734c98be | 2995 | should be in different alias sets, according to the C and C++ |
40bdc593 | 2996 | standard, since their types are not the same, and so, |
2997 | technically, an `int **' and `const int **' cannot point at | |
2998 | the same thing. | |
2999 | ||
4ee9c684 | 3000 | But, the standard is wrong. In particular, this code is |
40bdc593 | 3001 | legal C++: |
3002 | ||
a0c938f0 | 3003 | int *ip; |
3004 | int **ipp = &ip; | |
3005 | const int* const* cipp = ipp; | |
40bdc593 | 3006 | |
4ee9c684 | 3007 | And, it doesn't make sense for that to be legal unless you |
40bdc593 | 3008 | can dereference IPP and CIPP. So, we ignore cv-qualifiers on |
3009 | the pointed-to types. This issue has been reported to the | |
3010 | C++ committee. */ | |
211f3116 | 3011 | t1 = build_type_no_quals (t); |
f7c44134 | 3012 | if (t1 != t) |
3013 | return get_alias_set (t1); | |
87d2d17e | 3014 | } |
1e2513d9 | 3015 | |
4ee9c684 | 3016 | /* Handle the case of multiple type nodes referring to "the same" type, |
3017 | which occurs with IMA. These share an alias set. FIXME: Currently only | |
3018 | C90 is handled. (In C99 type compatibility is not transitive, which | |
3019 | complicates things mightily. The alias set splay trees can theoretically | |
3020 | represent this, but insertion is tricky when you consider all the | |
3021 | different orders things might arrive in.) */ | |
3022 | ||
3023 | if (c_language != clk_c || flag_isoc99) | |
3024 | return -1; | |
3025 | ||
0bed3869 | 3026 | /* Save time if there's only one input file. */ |
e08bd2f4 | 3027 | if (num_in_fnames == 1) |
4ee9c684 | 3028 | return -1; |
3029 | ||
3030 | /* Pointers need special handling if they point to any type that | |
3031 | needs special handling (below). */ | |
3032 | if (TREE_CODE (t) == POINTER_TYPE) | |
3033 | { | |
3034 | tree t2; | |
3035 | /* Find bottom type under any nested POINTERs. */ | |
b27ac6b5 | 3036 | for (t2 = TREE_TYPE (t); |
4ee9c684 | 3037 | TREE_CODE (t2) == POINTER_TYPE; |
3038 | t2 = TREE_TYPE (t2)) | |
3039 | ; | |
b27ac6b5 | 3040 | if (TREE_CODE (t2) != RECORD_TYPE |
4ee9c684 | 3041 | && TREE_CODE (t2) != ENUMERAL_TYPE |
3042 | && TREE_CODE (t2) != QUAL_UNION_TYPE | |
3043 | && TREE_CODE (t2) != UNION_TYPE) | |
3044 | return -1; | |
3045 | if (TYPE_SIZE (t2) == 0) | |
3046 | return -1; | |
3047 | } | |
3048 | /* These are the only cases that need special handling. */ | |
b27ac6b5 | 3049 | if (TREE_CODE (t) != RECORD_TYPE |
4ee9c684 | 3050 | && TREE_CODE (t) != ENUMERAL_TYPE |
3051 | && TREE_CODE (t) != QUAL_UNION_TYPE | |
3052 | && TREE_CODE (t) != UNION_TYPE | |
3053 | && TREE_CODE (t) != POINTER_TYPE) | |
3054 | return -1; | |
3055 | /* Undefined? */ | |
3056 | if (TYPE_SIZE (t) == 0) | |
3057 | return -1; | |
3058 | ||
b27ac6b5 | 3059 | /* Look up t in hash table. Only one of the compatible types within each |
4ee9c684 | 3060 | alias set is recorded in the table. */ |
3061 | if (!type_hash_table) | |
1ecd4018 | 3062 | type_hash_table = htab_create_ggc (1021, c_type_hash, |
4ee9c684 | 3063 | (htab_eq) lang_hooks.types_compatible_p, |
3064 | NULL); | |
3065 | slot = htab_find_slot (type_hash_table, t, INSERT); | |
3066 | if (*slot != NULL) | |
ad16cb2c | 3067 | { |
3068 | TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot); | |
3069 | return TYPE_ALIAS_SET ((tree)*slot); | |
3070 | } | |
4ee9c684 | 3071 | else |
3072 | /* Our caller will assign and record (in t) a new alias set; all we need | |
3073 | to do is remember t in the hash table. */ | |
3074 | *slot = t; | |
3075 | ||
f7c44134 | 3076 | return -1; |
b5ba9f3a | 3077 | } |
902b4e01 | 3078 | \f |
d4c4d95c | 3079 | /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the |
d3a4d008 | 3080 | second parameter indicates which OPERATOR is being applied. The COMPLAIN |
3081 | flag controls whether we should diagnose possibly ill-formed | |
3082 | constructs or not. */ | |
908c697e | 3083 | |
902b4e01 | 3084 | tree |
908c697e | 3085 | c_sizeof_or_alignof_type (tree type, bool is_sizeof, int complain) |
902b4e01 | 3086 | { |
d4c4d95c | 3087 | const char *op_name; |
3088 | tree value = NULL; | |
3089 | enum tree_code type_code = TREE_CODE (type); | |
1cae46be | 3090 | |
908c697e | 3091 | op_name = is_sizeof ? "sizeof" : "__alignof__"; |
1cae46be | 3092 | |
d4c4d95c | 3093 | if (type_code == FUNCTION_TYPE) |
902b4e01 | 3094 | { |
908c697e | 3095 | if (is_sizeof) |
d4c4d95c | 3096 | { |
d3a4d008 | 3097 | if (complain && (pedantic || warn_pointer_arith)) |
b0b1af64 | 3098 | pedwarn ("invalid application of %<sizeof%> to a function type"); |
d4c4d95c | 3099 | value = size_one_node; |
3100 | } | |
3101 | else | |
3102 | value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
3103 | } | |
3104 | else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
3105 | { | |
1cae46be | 3106 | if (type_code == VOID_TYPE |
d3a4d008 | 3107 | && complain && (pedantic || warn_pointer_arith)) |
b0b1af64 | 3108 | pedwarn ("invalid application of %qs to a void type", op_name); |
d4c4d95c | 3109 | value = size_one_node; |
902b4e01 | 3110 | } |
902b4e01 | 3111 | else if (!COMPLETE_TYPE_P (type)) |
3112 | { | |
d3a4d008 | 3113 | if (complain) |
b0b1af64 | 3114 | error ("invalid application of %qs to incomplete type %qT ", |
3ad0e8cc | 3115 | op_name, type); |
d4c4d95c | 3116 | value = size_zero_node; |
902b4e01 | 3117 | } |
3118 | else | |
d4c4d95c | 3119 | { |
908c697e | 3120 | if (is_sizeof) |
d4c4d95c | 3121 | /* Convert in case a char is more than one unit. */ |
3122 | value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
3123 | size_int (TYPE_PRECISION (char_type_node) | |
3124 | / BITS_PER_UNIT)); | |
3125 | else | |
d37625c0 | 3126 | value = size_int (TYPE_ALIGN_UNIT (type)); |
d4c4d95c | 3127 | } |
902b4e01 | 3128 | |
d4c4d95c | 3129 | /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. |
3130 | TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
3131 | never happen. However, this node should really have type | |
3132 | `size_t', which is just a typedef for an ordinary integer type. */ | |
143d62d7 | 3133 | value = fold_convert (size_type_node, value); |
1d8fc210 | 3134 | gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value))); |
1cae46be | 3135 | |
d4c4d95c | 3136 | return value; |
902b4e01 | 3137 | } |
3138 | ||
3139 | /* Implement the __alignof keyword: Return the minimum required | |
3140 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
3141 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
3142 | "aligned" __attribute__ specification). */ | |
72040e7e | 3143 | |
902b4e01 | 3144 | tree |
1cae46be | 3145 | c_alignof_expr (tree expr) |
902b4e01 | 3146 | { |
3147 | tree t; | |
3148 | ||
3149 | if (TREE_CODE (expr) == VAR_DECL) | |
d37625c0 | 3150 | t = size_int (DECL_ALIGN_UNIT (expr)); |
1cae46be | 3151 | |
902b4e01 | 3152 | else if (TREE_CODE (expr) == COMPONENT_REF |
3153 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
3154 | { | |
b0b1af64 | 3155 | error ("%<__alignof%> applied to a bit-field"); |
902b4e01 | 3156 | t = size_one_node; |
3157 | } | |
3158 | else if (TREE_CODE (expr) == COMPONENT_REF | |
7cc7e163 | 3159 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) |
d37625c0 | 3160 | t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1))); |
1cae46be | 3161 | |
902b4e01 | 3162 | else if (TREE_CODE (expr) == INDIRECT_REF) |
3163 | { | |
3164 | tree t = TREE_OPERAND (expr, 0); | |
3165 | tree best = t; | |
3166 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
1cae46be | 3167 | |
143d62d7 | 3168 | while ((TREE_CODE (t) == NOP_EXPR || TREE_CODE (t) == CONVERT_EXPR) |
7cc7e163 | 3169 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) |
902b4e01 | 3170 | { |
3171 | int thisalign; | |
3172 | ||
3173 | t = TREE_OPERAND (t, 0); | |
3174 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
3175 | if (thisalign > bestalign) | |
3176 | best = t, bestalign = thisalign; | |
3177 | } | |
3178 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
3179 | } | |
3180 | else | |
3181 | return c_alignof (TREE_TYPE (expr)); | |
3182 | ||
143d62d7 | 3183 | return fold_convert (size_type_node, t); |
902b4e01 | 3184 | } |
3185 | \f | |
8fe4a266 | 3186 | /* Handle C and C++ default attributes. */ |
3187 | ||
3188 | enum built_in_attribute | |
3189 | { | |
3190 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
3191 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
3192 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
3193 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
8fe4a266 | 3194 | #include "builtin-attrs.def" |
3195 | #undef DEF_ATTR_NULL_TREE | |
3196 | #undef DEF_ATTR_INT | |
3197 | #undef DEF_ATTR_IDENT | |
3198 | #undef DEF_ATTR_TREE_LIST | |
8fe4a266 | 3199 | ATTR_LAST |
3200 | }; | |
3201 | ||
3202 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
3203 | ||
1cae46be | 3204 | static void c_init_attributes (void); |
8fe4a266 | 3205 | |
27213ba3 | 3206 | enum c_builtin_type |
72040e7e | 3207 | { |
d2d4bdde | 3208 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, |
3209 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
3210 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
3211 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
3212 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
3213 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
0a39fd54 | 3214 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, |
27213ba3 | 3215 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, |
3216 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
d2d4bdde | 3217 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
3218 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
3219 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
03901330 | 3220 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
0a39fd54 | 3221 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, |
3222 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
3223 | NAME, | |
d2d4bdde | 3224 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
3225 | #include "builtin-types.def" | |
3226 | #undef DEF_PRIMITIVE_TYPE | |
3227 | #undef DEF_FUNCTION_TYPE_0 | |
3228 | #undef DEF_FUNCTION_TYPE_1 | |
3229 | #undef DEF_FUNCTION_TYPE_2 | |
3230 | #undef DEF_FUNCTION_TYPE_3 | |
3231 | #undef DEF_FUNCTION_TYPE_4 | |
0a39fd54 | 3232 | #undef DEF_FUNCTION_TYPE_5 |
3233 | #undef DEF_FUNCTION_TYPE_6 | |
27213ba3 | 3234 | #undef DEF_FUNCTION_TYPE_7 |
d2d4bdde | 3235 | #undef DEF_FUNCTION_TYPE_VAR_0 |
3236 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
3237 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
03901330 | 3238 | #undef DEF_FUNCTION_TYPE_VAR_3 |
0a39fd54 | 3239 | #undef DEF_FUNCTION_TYPE_VAR_4 |
3240 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
d2d4bdde | 3241 | #undef DEF_POINTER_TYPE |
27213ba3 | 3242 | BT_LAST |
3243 | }; | |
3244 | ||
3245 | typedef enum c_builtin_type builtin_type; | |
d2d4bdde | 3246 | |
27213ba3 | 3247 | /* A temporary array for c_common_nodes_and_builtins. Used in |
3248 | communication with def_fn_type. */ | |
3249 | static tree builtin_types[(int) BT_LAST + 1]; | |
d2d4bdde | 3250 | |
27213ba3 | 3251 | /* A helper function for c_common_nodes_and_builtins. Build function type |
3252 | for DEF with return type RET and N arguments. If VAR is true, then the | |
3253 | function should be variadic after those N arguments. | |
3254 | ||
3255 | Takes special care not to ICE if any of the types involved are | |
3256 | error_mark_node, which indicates that said type is not in fact available | |
3257 | (see builtin_type_for_size). In which case the function type as a whole | |
3258 | should be error_mark_node. */ | |
3259 | ||
3260 | static void | |
3261 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
3262 | { | |
3263 | tree args = NULL, t; | |
3264 | va_list list; | |
3265 | int i; | |
3266 | ||
3267 | va_start (list, n); | |
3268 | for (i = 0; i < n; ++i) | |
3269 | { | |
3270 | builtin_type a = va_arg (list, builtin_type); | |
3271 | t = builtin_types[a]; | |
3272 | if (t == error_mark_node) | |
3273 | goto egress; | |
3274 | args = tree_cons (NULL_TREE, t, args); | |
3275 | } | |
3276 | va_end (list); | |
3277 | ||
3278 | args = nreverse (args); | |
3279 | if (!var) | |
3280 | args = chainon (args, void_list_node); | |
3281 | ||
3282 | t = builtin_types[ret]; | |
3283 | if (t == error_mark_node) | |
3284 | goto egress; | |
3285 | t = build_function_type (t, args); | |
3286 | ||
3287 | egress: | |
3288 | builtin_types[def] = t; | |
3289 | } | |
3290 | ||
dce22712 | 3291 | /* Build builtin functions common to both C and C++ language |
3292 | frontends. */ | |
3293 | ||
3294 | static void | |
3295 | c_define_builtins (tree va_list_ref_type_node, tree va_list_arg_type_node) | |
3296 | { | |
3297 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
3298 | builtin_types[ENUM] = VALUE; | |
3299 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
3300 | def_fn_type (ENUM, RETURN, 0, 0); | |
3301 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
3302 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
3303 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
3304 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
3305 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3306 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
3307 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
3308 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
3309 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
3310 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
3311 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
3312 | ARG6) \ | |
3313 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
3314 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
3315 | ARG6, ARG7) \ | |
3316 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
3317 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
3318 | def_fn_type (ENUM, RETURN, 1, 0); | |
3319 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
3320 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
3321 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
3322 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
3323 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3324 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
3325 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
3326 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
3327 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
3328 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
3329 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
3330 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
3331 | ||
3332 | #include "builtin-types.def" | |
3333 | ||
3334 | #undef DEF_PRIMITIVE_TYPE | |
3335 | #undef DEF_FUNCTION_TYPE_1 | |
3336 | #undef DEF_FUNCTION_TYPE_2 | |
3337 | #undef DEF_FUNCTION_TYPE_3 | |
3338 | #undef DEF_FUNCTION_TYPE_4 | |
3339 | #undef DEF_FUNCTION_TYPE_5 | |
3340 | #undef DEF_FUNCTION_TYPE_6 | |
3341 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
3342 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
3343 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
3344 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
3345 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
3346 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
3347 | #undef DEF_POINTER_TYPE | |
3348 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
3349 | ||
3350 | c_init_attributes (); | |
3351 | ||
3352 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
3353 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
3354 | if (NAME && COND) \ | |
3355 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
3356 | builtin_types[(int) TYPE], \ | |
3357 | builtin_types[(int) LIBTYPE], \ | |
3358 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
3359 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
3360 | #include "builtins.def" | |
3361 | #undef DEF_BUILTIN | |
3362 | ||
3363 | build_common_builtin_nodes (); | |
3364 | ||
3365 | targetm.init_builtins (); | |
3366 | if (flag_mudflap) | |
3367 | mudflap_init (); | |
3368 | } | |
3369 | ||
27213ba3 | 3370 | /* Build tree nodes and builtin functions common to both C and C++ language |
3371 | frontends. */ | |
3372 | ||
3373 | void | |
3374 | c_common_nodes_and_builtins (void) | |
3375 | { | |
174fcc61 | 3376 | int wchar_type_size; |
3377 | tree array_domain_type; | |
2d47cc32 | 3378 | tree va_list_ref_type_node; |
8a15c04a | 3379 | tree va_list_arg_type_node; |
a66c9326 | 3380 | |
174fcc61 | 3381 | /* Define `int' and `char' first so that dbx will output them first. */ |
d946ea19 | 3382 | record_builtin_type (RID_INT, NULL, integer_type_node); |
174fcc61 | 3383 | record_builtin_type (RID_CHAR, "char", char_type_node); |
3384 | ||
3385 | /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
3386 | "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
3387 | but not C. Are the conditionals here needed? */ | |
c0f19401 | 3388 | if (c_dialect_cxx ()) |
d946ea19 | 3389 | record_builtin_type (RID_SIGNED, NULL, integer_type_node); |
174fcc61 | 3390 | record_builtin_type (RID_LONG, "long int", long_integer_type_node); |
3391 | record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
3392 | record_builtin_type (RID_MAX, "long unsigned int", | |
3393 | long_unsigned_type_node); | |
c0f19401 | 3394 | if (c_dialect_cxx ()) |
174fcc61 | 3395 | record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); |
3396 | record_builtin_type (RID_MAX, "long long int", | |
3397 | long_long_integer_type_node); | |
3398 | record_builtin_type (RID_MAX, "long long unsigned int", | |
3399 | long_long_unsigned_type_node); | |
c0f19401 | 3400 | if (c_dialect_cxx ()) |
174fcc61 | 3401 | record_builtin_type (RID_MAX, "long long unsigned", |
3402 | long_long_unsigned_type_node); | |
3403 | record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
3404 | record_builtin_type (RID_MAX, "short unsigned int", | |
3405 | short_unsigned_type_node); | |
c0f19401 | 3406 | if (c_dialect_cxx ()) |
174fcc61 | 3407 | record_builtin_type (RID_MAX, "unsigned short", |
3408 | short_unsigned_type_node); | |
3409 | ||
3410 | /* Define both `signed char' and `unsigned char'. */ | |
3411 | record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
3412 | record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
3413 | ||
771d21fa | 3414 | /* These are types that c_common_type_for_size and |
3415 | c_common_type_for_mode use. */ | |
dc24ddbd | 3416 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3417 | intQI_type_node)); | |
3418 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3419 | intHI_type_node)); | |
3420 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3421 | intSI_type_node)); | |
3422 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3423 | intDI_type_node)); | |
174fcc61 | 3424 | #if HOST_BITS_PER_WIDE_INT >= 64 |
f1515a39 | 3425 | if (targetm.scalar_mode_supported_p (TImode)) |
3426 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3427 | get_identifier ("__int128_t"), | |
3428 | intTI_type_node)); | |
174fcc61 | 3429 | #endif |
dc24ddbd | 3430 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3431 | unsigned_intQI_type_node)); | |
3432 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3433 | unsigned_intHI_type_node)); | |
3434 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3435 | unsigned_intSI_type_node)); | |
3436 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3437 | unsigned_intDI_type_node)); | |
174fcc61 | 3438 | #if HOST_BITS_PER_WIDE_INT >= 64 |
f1515a39 | 3439 | if (targetm.scalar_mode_supported_p (TImode)) |
3440 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3441 | get_identifier ("__uint128_t"), | |
3442 | unsigned_intTI_type_node)); | |
174fcc61 | 3443 | #endif |
3444 | ||
3445 | /* Create the widest literal types. */ | |
3446 | widest_integer_literal_type_node | |
3447 | = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 3448 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3449 | widest_integer_literal_type_node)); | |
174fcc61 | 3450 | |
3451 | widest_unsigned_literal_type_node | |
3452 | = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 3453 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3454 | widest_unsigned_literal_type_node)); | |
174fcc61 | 3455 | |
3456 | /* `unsigned long' is the standard type for sizeof. | |
3457 | Note that stddef.h uses `unsigned long', | |
3458 | and this must agree, even if long and int are the same size. */ | |
654ef926 | 3459 | size_type_node = |
174fcc61 | 3460 | TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); |
654ef926 | 3461 | signed_size_type_node = c_common_signed_type (size_type_node); |
3462 | set_sizetype (size_type_node); | |
174fcc61 | 3463 | |
73673831 | 3464 | pid_type_node = |
3465 | TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
3466 | ||
174fcc61 | 3467 | build_common_tree_nodes_2 (flag_short_double); |
3468 | ||
d946ea19 | 3469 | record_builtin_type (RID_FLOAT, NULL, float_type_node); |
3470 | record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
174fcc61 | 3471 | record_builtin_type (RID_MAX, "long double", long_double_type_node); |
3472 | ||
c4503c0a | 3473 | /* Only supported decimal floating point extension if the target |
3474 | actually supports underlying modes. */ | |
3475 | if (targetm.scalar_mode_supported_p (SDmode) | |
3476 | && targetm.scalar_mode_supported_p (DDmode) | |
3477 | && targetm.scalar_mode_supported_p (TDmode)) | |
3478 | { | |
3479 | record_builtin_type (RID_DFLOAT32, NULL, dfloat32_type_node); | |
3480 | record_builtin_type (RID_DFLOAT64, NULL, dfloat64_type_node); | |
3481 | record_builtin_type (RID_DFLOAT128, NULL, dfloat128_type_node); | |
3482 | } | |
3483 | ||
dc24ddbd | 3484 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3485 | get_identifier ("complex int"), | |
3486 | complex_integer_type_node)); | |
3487 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3488 | get_identifier ("complex float"), | |
3489 | complex_float_type_node)); | |
3490 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3491 | get_identifier ("complex double"), | |
3492 | complex_double_type_node)); | |
3493 | lang_hooks.decls.pushdecl | |
20325f61 | 3494 | (build_decl (TYPE_DECL, get_identifier ("complex long double"), |
3495 | complex_long_double_type_node)); | |
174fcc61 | 3496 | |
e256d445 | 3497 | if (c_dialect_cxx ()) |
3498 | /* For C++, make fileptr_type_node a distinct void * type until | |
3499 | FILE type is defined. */ | |
e086912e | 3500 | fileptr_type_node = build_variant_type_copy (ptr_type_node); |
e256d445 | 3501 | |
d946ea19 | 3502 | record_builtin_type (RID_VOID, NULL, void_type_node); |
174fcc61 | 3503 | |
6753bca0 | 3504 | /* Set the TYPE_NAME for any variants that were built before |
3505 | record_builtin_type gave names to the built-in types. */ | |
3506 | { | |
3507 | tree void_name = TYPE_NAME (void_type_node); | |
3508 | TYPE_NAME (void_type_node) = NULL_TREE; | |
3509 | TYPE_NAME (build_qualified_type (void_type_node, TYPE_QUAL_CONST)) | |
3510 | = void_name; | |
3511 | TYPE_NAME (void_type_node) = void_name; | |
3512 | } | |
3513 | ||
fbf0afd1 | 3514 | /* This node must not be shared. */ |
7c446c95 | 3515 | void_zero_node = make_node (INTEGER_CST); |
d2d4bdde | 3516 | TREE_TYPE (void_zero_node) = void_type_node; |
3517 | ||
174fcc61 | 3518 | void_list_node = build_void_list_node (); |
3519 | ||
3520 | /* Make a type to be the domain of a few array types | |
3521 | whose domains don't really matter. | |
3522 | 200 is small enough that it always fits in size_t | |
3523 | and large enough that it can hold most function names for the | |
3524 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
3525 | array_domain_type = build_index_type (size_int (200)); | |
3526 | ||
3527 | /* Make a type for arrays of characters. | |
3528 | With luck nothing will ever really depend on the length of this | |
3529 | array type. */ | |
3530 | char_array_type_node | |
3531 | = build_array_type (char_type_node, array_domain_type); | |
3532 | ||
3533 | /* Likewise for arrays of ints. */ | |
3534 | int_array_type_node | |
3535 | = build_array_type (integer_type_node, array_domain_type); | |
3536 | ||
d2d4bdde | 3537 | string_type_node = build_pointer_type (char_type_node); |
3538 | const_string_type_node | |
3539 | = build_pointer_type (build_qualified_type | |
3540 | (char_type_node, TYPE_QUAL_CONST)); | |
3541 | ||
174fcc61 | 3542 | /* This is special for C++ so functions can be overloaded. */ |
18ef7ac2 | 3543 | wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); |
174fcc61 | 3544 | wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); |
3545 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
c0f19401 | 3546 | if (c_dialect_cxx ()) |
174fcc61 | 3547 | { |
78a8ed03 | 3548 | if (TYPE_UNSIGNED (wchar_type_node)) |
174fcc61 | 3549 | wchar_type_node = make_unsigned_type (wchar_type_size); |
3550 | else | |
3551 | wchar_type_node = make_signed_type (wchar_type_size); | |
3552 | record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
3553 | } | |
3554 | else | |
3555 | { | |
4070745f | 3556 | signed_wchar_type_node = c_common_signed_type (wchar_type_node); |
3557 | unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node); | |
174fcc61 | 3558 | } |
3559 | ||
3560 | /* This is for wide string constants. */ | |
3561 | wchar_array_type_node | |
3562 | = build_array_type (wchar_type_node, array_domain_type); | |
3563 | ||
6bf5ed8d | 3564 | wint_type_node = |
3565 | TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
3566 | ||
3567 | intmax_type_node = | |
3568 | TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
3569 | uintmax_type_node = | |
3570 | TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
3571 | ||
3572 | default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
3573 | ptrdiff_type_node | |
3574 | = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
4070745f | 3575 | unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); |
6bf5ed8d | 3576 | |
dc24ddbd | 3577 | lang_hooks.decls.pushdecl |
20325f61 | 3578 | (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"), |
3579 | va_list_type_node)); | |
8a15c04a | 3580 | |
8a15c04a | 3581 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
2d47cc32 | 3582 | { |
3583 | va_list_arg_type_node = va_list_ref_type_node = | |
3584 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
3585 | } | |
8a15c04a | 3586 | else |
2d47cc32 | 3587 | { |
3588 | va_list_arg_type_node = va_list_type_node; | |
3589 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
3590 | } | |
1cae46be | 3591 | |
dce22712 | 3592 | if (!flag_preprocess_only) |
3593 | c_define_builtins (va_list_ref_type_node, va_list_arg_type_node); | |
ffa8918b | 3594 | |
5c62f199 | 3595 | main_identifier_node = get_identifier ("main"); |
ae84079f | 3596 | |
3597 | /* Create the built-in __null node. It is important that this is | |
3598 | not shared. */ | |
3599 | null_node = make_node (INTEGER_CST); | |
3600 | TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0); | |
27213ba3 | 3601 | |
3602 | /* Since builtin_types isn't gc'ed, don't export these nodes. */ | |
3603 | memset (builtin_types, 0, sizeof (builtin_types)); | |
72040e7e | 3604 | } |
a66c9326 | 3605 | |
46a7e216 | 3606 | /* Look up the function in built_in_decls that corresponds to DECL |
3607 | and set ASMSPEC as its user assembler name. DECL must be a | |
f7f07c95 | 3608 | function decl that declares a builtin. */ |
46a7e216 | 3609 | |
3610 | void | |
3611 | set_builtin_user_assembler_name (tree decl, const char *asmspec) | |
3612 | { | |
3613 | tree builtin; | |
3614 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
3615 | && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL | |
3616 | && asmspec != 0); | |
3617 | ||
3618 | builtin = built_in_decls [DECL_FUNCTION_CODE (decl)]; | |
3619 | set_user_assembler_name (builtin, asmspec); | |
3620 | if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY) | |
3621 | init_block_move_fn (asmspec); | |
3622 | else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET) | |
3623 | init_block_clear_fn (asmspec); | |
3624 | } | |
3625 | ||
79b01846 | 3626 | /* The number of named compound-literals generated thus far. */ |
3627 | static GTY(()) int compound_literal_number; | |
3628 | ||
3629 | /* Set DECL_NAME for DECL, a VAR_DECL for a compound-literal. */ | |
3630 | ||
3631 | void | |
3632 | set_compound_literal_name (tree decl) | |
3633 | { | |
3634 | char *name; | |
3635 | ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", | |
3636 | compound_literal_number); | |
3637 | compound_literal_number++; | |
3638 | DECL_NAME (decl) = get_identifier (name); | |
3639 | } | |
3640 | ||
a66c9326 | 3641 | tree |
1cae46be | 3642 | build_va_arg (tree expr, tree type) |
a66c9326 | 3643 | { |
3644 | return build1 (VA_ARG_EXPR, type, expr); | |
3645 | } | |
0d4238dc | 3646 | |
3647 | ||
dd878098 | 3648 | /* Linked list of disabled built-in functions. */ |
3649 | ||
3650 | typedef struct disabled_builtin | |
3651 | { | |
3652 | const char *name; | |
3653 | struct disabled_builtin *next; | |
3654 | } disabled_builtin; | |
3655 | static disabled_builtin *disabled_builtins = NULL; | |
3656 | ||
1cae46be | 3657 | static bool builtin_function_disabled_p (const char *); |
dd878098 | 3658 | |
3659 | /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
3660 | begins with "__builtin_", give an error. */ | |
3661 | ||
3662 | void | |
1cae46be | 3663 | disable_builtin_function (const char *name) |
dd878098 | 3664 | { |
3665 | if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
b0b1af64 | 3666 | error ("cannot disable built-in function %qs", name); |
dd878098 | 3667 | else |
3668 | { | |
e85905e5 | 3669 | disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin); |
3670 | new_disabled_builtin->name = name; | |
3671 | new_disabled_builtin->next = disabled_builtins; | |
3672 | disabled_builtins = new_disabled_builtin; | |
dd878098 | 3673 | } |
3674 | } | |
3675 | ||
3676 | ||
3677 | /* Return true if the built-in function NAME has been disabled, false | |
3678 | otherwise. */ | |
3679 | ||
3680 | static bool | |
1cae46be | 3681 | builtin_function_disabled_p (const char *name) |
dd878098 | 3682 | { |
3683 | disabled_builtin *p; | |
3684 | for (p = disabled_builtins; p != NULL; p = p->next) | |
3685 | { | |
3686 | if (strcmp (name, p->name) == 0) | |
3687 | return true; | |
3688 | } | |
3689 | return false; | |
3690 | } | |
3691 | ||
3692 | ||
3237155d | 3693 | /* Worker for DEF_BUILTIN. |
3694 | Possibly define a builtin function with one or two names. | |
3695 | Does not declare a non-__builtin_ function if flag_no_builtin, or if | |
3696 | nonansi_p and flag_no_nonansi_builtin. */ | |
0d4238dc | 3697 | |
3237155d | 3698 | static void |
3699 | def_builtin_1 (enum built_in_function fncode, | |
3700 | const char *name, | |
3701 | enum built_in_class fnclass, | |
3702 | tree fntype, tree libtype, | |
3703 | bool both_p, bool fallback_p, bool nonansi_p, | |
3704 | tree fnattrs, bool implicit_p) | |
0d4238dc | 3705 | { |
3237155d | 3706 | tree decl; |
3707 | const char *libname; | |
3708 | ||
27213ba3 | 3709 | if (fntype == error_mark_node) |
3710 | return; | |
3711 | ||
3237155d | 3712 | gcc_assert ((!both_p && !fallback_p) |
3713 | || !strncmp (name, "__builtin_", | |
3714 | strlen ("__builtin_"))); | |
3715 | ||
3716 | libname = name + strlen ("__builtin_"); | |
54be5d7e | 3717 | decl = add_builtin_function (name, fntype, fncode, fnclass, |
3718 | (fallback_p ? libname : NULL), | |
3719 | fnattrs); | |
3237155d | 3720 | if (both_p |
3721 | && !flag_no_builtin && !builtin_function_disabled_p (libname) | |
dd878098 | 3722 | && !(nonansi_p && flag_no_nonansi_builtin)) |
54be5d7e | 3723 | add_builtin_function (libname, libtype, fncode, fnclass, |
3724 | NULL, fnattrs); | |
a40609e6 | 3725 | |
3237155d | 3726 | built_in_decls[(int) fncode] = decl; |
3727 | if (implicit_p) | |
3728 | implicit_built_in_decls[(int) fncode] = decl; | |
0d4238dc | 3729 | } |
e94026da | 3730 | \f |
d7aeef06 | 3731 | /* Nonzero if the type T promotes to int. This is (nearly) the |
3732 | integral promotions defined in ISO C99 6.3.1.1/2. */ | |
3733 | ||
3734 | bool | |
1cae46be | 3735 | c_promoting_integer_type_p (tree t) |
d7aeef06 | 3736 | { |
3737 | switch (TREE_CODE (t)) | |
3738 | { | |
3739 | case INTEGER_TYPE: | |
3740 | return (TYPE_MAIN_VARIANT (t) == char_type_node | |
3741 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
3742 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
3743 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
7aa1e6eb | 3744 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node |
3745 | || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
d7aeef06 | 3746 | |
3747 | case ENUMERAL_TYPE: | |
3748 | /* ??? Technically all enumerations not larger than an int | |
3749 | promote to an int. But this is used along code paths | |
3750 | that only want to notice a size change. */ | |
3751 | return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
3752 | ||
3753 | case BOOLEAN_TYPE: | |
3754 | return 1; | |
3755 | ||
3756 | default: | |
3757 | return 0; | |
3758 | } | |
3759 | } | |
3760 | ||
e94026da | 3761 | /* Return 1 if PARMS specifies a fixed number of parameters |
3762 | and none of their types is affected by default promotions. */ | |
3763 | ||
3764 | int | |
1cae46be | 3765 | self_promoting_args_p (tree parms) |
e94026da | 3766 | { |
19cb6b50 | 3767 | tree t; |
e94026da | 3768 | for (t = parms; t; t = TREE_CHAIN (t)) |
3769 | { | |
19cb6b50 | 3770 | tree type = TREE_VALUE (t); |
43f74bc4 | 3771 | |
e1d8e198 | 3772 | if (type == error_mark_node) |
3773 | continue; | |
3774 | ||
e94026da | 3775 | if (TREE_CHAIN (t) == 0 && type != void_type_node) |
3776 | return 0; | |
3777 | ||
3778 | if (type == 0) | |
3779 | return 0; | |
3780 | ||
3781 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
3782 | return 0; | |
3783 | ||
d7aeef06 | 3784 | if (c_promoting_integer_type_p (type)) |
e94026da | 3785 | return 0; |
3786 | } | |
3787 | return 1; | |
3788 | } | |
605fb01e | 3789 | |
c25509f2 | 3790 | /* Recursively examines the array elements of TYPE, until a non-array |
3791 | element type is found. */ | |
3792 | ||
3793 | tree | |
1cae46be | 3794 | strip_array_types (tree type) |
c25509f2 | 3795 | { |
3796 | while (TREE_CODE (type) == ARRAY_TYPE) | |
3797 | type = TREE_TYPE (type); | |
3798 | ||
3799 | return type; | |
3800 | } | |
3801 | ||
c10de5e7 | 3802 | /* Recursively remove any '*' or '&' operator from TYPE. */ |
3803 | tree | |
3804 | strip_pointer_operator (tree t) | |
3805 | { | |
3806 | while (POINTER_TYPE_P (t)) | |
3807 | t = TREE_TYPE (t); | |
3808 | return t; | |
3809 | } | |
3810 | ||
e41f0d80 | 3811 | /* Used to compare case labels. K1 and K2 are actually tree nodes |
3812 | representing case labels, or NULL_TREE for a `default' label. | |
3813 | Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
3814 | K2, and 0 if K1 and K2 are equal. */ | |
3815 | ||
3816 | int | |
1cae46be | 3817 | case_compare (splay_tree_key k1, splay_tree_key k2) |
e41f0d80 | 3818 | { |
3819 | /* Consider a NULL key (such as arises with a `default' label) to be | |
3820 | smaller than anything else. */ | |
3821 | if (!k1) | |
3822 | return k2 ? -1 : 0; | |
3823 | else if (!k2) | |
3824 | return k1 ? 1 : 0; | |
3825 | ||
3826 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
3827 | } | |
3828 | ||
3829 | /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If | |
3830 | LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is | |
3831 | actually a `default' label. If only HIGH_VALUE is NULL_TREE, then | |
3832 | case label was declared using the usual C/C++ syntax, rather than | |
3833 | the GNU case range extension. CASES is a tree containing all the | |
3834 | case ranges processed so far; COND is the condition for the | |
eaae3b75 | 3835 | switch-statement itself. Returns the CASE_LABEL_EXPR created, or |
3836 | ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */ | |
e41f0d80 | 3837 | |
3838 | tree | |
2ca392fd | 3839 | c_add_case_label (splay_tree cases, tree cond, tree orig_type, |
3840 | tree low_value, tree high_value) | |
e41f0d80 | 3841 | { |
3842 | tree type; | |
3843 | tree label; | |
3844 | tree case_label; | |
3845 | splay_tree_node node; | |
3846 | ||
3847 | /* Create the LABEL_DECL itself. */ | |
4ee9c684 | 3848 | label = create_artificial_label (); |
e41f0d80 | 3849 | |
3850 | /* If there was an error processing the switch condition, bail now | |
3851 | before we get more confused. */ | |
3852 | if (!cond || cond == error_mark_node) | |
4ee9c684 | 3853 | goto error_out; |
e41f0d80 | 3854 | |
1cae46be | 3855 | if ((low_value && TREE_TYPE (low_value) |
3856 | && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
e41f0d80 | 3857 | || (high_value && TREE_TYPE (high_value) |
3858 | && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
b96dc121 | 3859 | { |
3860 | error ("pointers are not permitted as case values"); | |
3861 | goto error_out; | |
3862 | } | |
e41f0d80 | 3863 | |
3864 | /* Case ranges are a GNU extension. */ | |
3865 | if (high_value && pedantic) | |
c0f19401 | 3866 | pedwarn ("range expressions in switch statements are non-standard"); |
e41f0d80 | 3867 | |
3868 | type = TREE_TYPE (cond); | |
3869 | if (low_value) | |
3870 | { | |
3871 | low_value = check_case_value (low_value); | |
3872 | low_value = convert_and_check (type, low_value); | |
96722196 | 3873 | if (low_value == error_mark_node) |
3874 | goto error_out; | |
e41f0d80 | 3875 | } |
3876 | if (high_value) | |
3877 | { | |
3878 | high_value = check_case_value (high_value); | |
3879 | high_value = convert_and_check (type, high_value); | |
96722196 | 3880 | if (high_value == error_mark_node) |
3881 | goto error_out; | |
e41f0d80 | 3882 | } |
3883 | ||
96722196 | 3884 | if (low_value && high_value) |
3885 | { | |
3886 | /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
a0c938f0 | 3887 | really a case range, even though it was written that way. |
3888 | Remove the HIGH_VALUE to simplify later processing. */ | |
96722196 | 3889 | if (tree_int_cst_equal (low_value, high_value)) |
3890 | high_value = NULL_TREE; | |
3891 | else if (!tree_int_cst_lt (low_value, high_value)) | |
3892 | warning (0, "empty range specified"); | |
3893 | } | |
e41f0d80 | 3894 | |
2ca392fd | 3895 | /* See if the case is in range of the type of the original testing |
3896 | expression. If both low_value and high_value are out of range, | |
3897 | don't insert the case label and return NULL_TREE. */ | |
3898 | if (low_value | |
84166705 | 3899 | && !check_case_bounds (type, orig_type, |
3900 | &low_value, high_value ? &high_value : NULL)) | |
2ca392fd | 3901 | return NULL_TREE; |
3902 | ||
e41f0d80 | 3903 | /* Look up the LOW_VALUE in the table of case labels we already |
3904 | have. */ | |
3905 | node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
3906 | /* If there was not an exact match, check for overlapping ranges. | |
3907 | There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
3908 | that's a `default' label and the only overlap is an exact match. */ | |
3909 | if (!node && (low_value || high_value)) | |
3910 | { | |
3911 | splay_tree_node low_bound; | |
3912 | splay_tree_node high_bound; | |
3913 | ||
3914 | /* Even though there wasn't an exact match, there might be an | |
3915 | overlap between this case range and another case range. | |
3916 | Since we've (inductively) not allowed any overlapping case | |
3917 | ranges, we simply need to find the greatest low case label | |
3918 | that is smaller that LOW_VALUE, and the smallest low case | |
3919 | label that is greater than LOW_VALUE. If there is an overlap | |
3920 | it will occur in one of these two ranges. */ | |
3921 | low_bound = splay_tree_predecessor (cases, | |
3922 | (splay_tree_key) low_value); | |
3923 | high_bound = splay_tree_successor (cases, | |
3924 | (splay_tree_key) low_value); | |
3925 | ||
3926 | /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
3927 | the LOW_VALUE, so there is no need to check unless the | |
3928 | LOW_BOUND is in fact itself a case range. */ | |
3929 | if (low_bound | |
3930 | && CASE_HIGH ((tree) low_bound->value) | |
3931 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
3932 | low_value) >= 0) | |
3933 | node = low_bound; | |
3934 | /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
3935 | range is bigger than the low end of the current range, so we | |
3936 | are only interested if the current range is a real range, and | |
3937 | not an ordinary case label. */ | |
1cae46be | 3938 | else if (high_bound |
e41f0d80 | 3939 | && high_value |
3940 | && (tree_int_cst_compare ((tree) high_bound->key, | |
3941 | high_value) | |
3942 | <= 0)) | |
3943 | node = high_bound; | |
3944 | } | |
3945 | /* If there was an overlap, issue an error. */ | |
3946 | if (node) | |
3947 | { | |
eaae3b75 | 3948 | tree duplicate = CASE_LABEL ((tree) node->value); |
e41f0d80 | 3949 | |
3950 | if (high_value) | |
3951 | { | |
3952 | error ("duplicate (or overlapping) case value"); | |
9bc3739f | 3953 | error ("%Jthis is the first entry overlapping that value", duplicate); |
e41f0d80 | 3954 | } |
3955 | else if (low_value) | |
3956 | { | |
3957 | error ("duplicate case value") ; | |
9bc3739f | 3958 | error ("%Jpreviously used here", duplicate); |
e41f0d80 | 3959 | } |
3960 | else | |
3961 | { | |
3962 | error ("multiple default labels in one switch"); | |
9bc3739f | 3963 | error ("%Jthis is the first default label", duplicate); |
e41f0d80 | 3964 | } |
4ee9c684 | 3965 | goto error_out; |
e41f0d80 | 3966 | } |
3967 | ||
3968 | /* Add a CASE_LABEL to the statement-tree. */ | |
3969 | case_label = add_stmt (build_case_label (low_value, high_value, label)); | |
3970 | /* Register this case label in the splay tree. */ | |
1cae46be | 3971 | splay_tree_insert (cases, |
e41f0d80 | 3972 | (splay_tree_key) low_value, |
3973 | (splay_tree_value) case_label); | |
3974 | ||
3975 | return case_label; | |
4ee9c684 | 3976 | |
3977 | error_out: | |
daf6dff5 | 3978 | /* Add a label so that the back-end doesn't think that the beginning of |
4ee9c684 | 3979 | the switch is unreachable. Note that we do not add a case label, as |
a53ff4c1 | 3980 | that just leads to duplicates and thence to failure later on. */ |
4ee9c684 | 3981 | if (!cases->root) |
3982 | { | |
3983 | tree t = create_artificial_label (); | |
daf6dff5 | 3984 | add_stmt (build_stmt (LABEL_EXPR, t)); |
4ee9c684 | 3985 | } |
3986 | return error_mark_node; | |
3987 | } | |
3988 | ||
3989 | /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
3990 | Used to verify that case values match up with enumerator values. */ | |
3991 | ||
3992 | static void | |
3993 | match_case_to_enum_1 (tree key, tree type, tree label) | |
3994 | { | |
3995 | char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
3996 | ||
3997 | /* ??? Not working too hard to print the double-word value. | |
3998 | Should perhaps be done with %lwd in the diagnostic routines? */ | |
3999 | if (TREE_INT_CST_HIGH (key) == 0) | |
4000 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
4001 | TREE_INT_CST_LOW (key)); | |
4002 | else if (!TYPE_UNSIGNED (type) | |
4003 | && TREE_INT_CST_HIGH (key) == -1 | |
4004 | && TREE_INT_CST_LOW (key) != 0) | |
4005 | snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
4006 | -TREE_INT_CST_LOW (key)); | |
4007 | else | |
4008 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
4009 | TREE_INT_CST_HIGH (key), TREE_INT_CST_LOW (key)); | |
4010 | ||
4011 | if (TYPE_NAME (type) == 0) | |
c3ceba8e | 4012 | warning (0, "%Jcase value %qs not in enumerated type", |
eaae3b75 | 4013 | CASE_LABEL (label), buf); |
4ee9c684 | 4014 | else |
c3ceba8e | 4015 | warning (0, "%Jcase value %qs not in enumerated type %qT", |
eaae3b75 | 4016 | CASE_LABEL (label), buf, type); |
4ee9c684 | 4017 | } |
4018 | ||
359d87c6 | 4019 | /* Subroutine of c_do_switch_warnings, called via splay_tree_foreach. |
4020 | Used to verify that case values match up with enumerator values. */ | |
4021 | ||
4ee9c684 | 4022 | static int |
4023 | match_case_to_enum (splay_tree_node node, void *data) | |
4024 | { | |
4025 | tree label = (tree) node->value; | |
4fd61bc6 | 4026 | tree type = (tree) data; |
4ee9c684 | 4027 | |
4028 | /* Skip default case. */ | |
4029 | if (!CASE_LOW (label)) | |
4030 | return 0; | |
4031 | ||
359d87c6 | 4032 | /* If CASE_LOW_SEEN is not set, that means CASE_LOW did not appear |
4ee9c684 | 4033 | when we did our enum->case scan. Reset our scratch bit after. */ |
359d87c6 | 4034 | if (!CASE_LOW_SEEN (label)) |
4ee9c684 | 4035 | match_case_to_enum_1 (CASE_LOW (label), type, label); |
4036 | else | |
359d87c6 | 4037 | CASE_LOW_SEEN (label) = 0; |
4ee9c684 | 4038 | |
359d87c6 | 4039 | /* If CASE_HIGH is non-null, we have a range. If CASE_HIGH_SEEN is |
4040 | not set, that means that CASE_HIGH did not appear when we did our | |
4041 | enum->case scan. Reset our scratch bit after. */ | |
4ee9c684 | 4042 | if (CASE_HIGH (label)) |
4043 | { | |
359d87c6 | 4044 | if (!CASE_HIGH_SEEN (label)) |
4045 | match_case_to_enum_1 (CASE_HIGH (label), type, label); | |
4046 | else | |
4047 | CASE_HIGH_SEEN (label) = 0; | |
4ee9c684 | 4048 | } |
4049 | ||
4050 | return 0; | |
4051 | } | |
4052 | ||
e7911019 | 4053 | /* Handle -Wswitch*. Called from the front end after parsing the |
4054 | switch construct. */ | |
4055 | /* ??? Should probably be somewhere generic, since other languages | |
4056 | besides C and C++ would want this. At the moment, however, C/C++ | |
4057 | are the only tree-ssa languages that support enumerations at all, | |
4058 | so the point is moot. */ | |
4ee9c684 | 4059 | |
e7911019 | 4060 | void |
4061 | c_do_switch_warnings (splay_tree cases, location_t switch_location, | |
4062 | tree type, tree cond) | |
4ee9c684 | 4063 | { |
b27ac6b5 | 4064 | splay_tree_node default_node; |
359d87c6 | 4065 | splay_tree_node node; |
4066 | tree chain; | |
4ee9c684 | 4067 | |
4068 | if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
4069 | return; | |
4070 | ||
4ee9c684 | 4071 | default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); |
8b6866af | 4072 | if (!default_node) |
4073 | warning (OPT_Wswitch_default, "%Hswitch missing default case", | |
4074 | &switch_location); | |
4ee9c684 | 4075 | |
359d87c6 | 4076 | /* From here on, we only care about about enumerated types. */ |
4077 | if (!type || TREE_CODE (type) != ENUMERAL_TYPE) | |
4078 | return; | |
4079 | ||
4ee9c684 | 4080 | /* If the switch expression was an enumerated type, check that |
4081 | exactly all enumeration literals are covered by the cases. | |
4082 | The check is made when -Wswitch was specified and there is no | |
4083 | default case, or when -Wswitch-enum was specified. */ | |
4ee9c684 | 4084 | |
359d87c6 | 4085 | if (!warn_switch_enum |
4086 | && !(warn_switch && !default_node)) | |
4087 | return; | |
4088 | ||
4089 | /* Clearing COND if it is not an integer constant simplifies | |
4090 | the tests inside the loop below. */ | |
4091 | if (TREE_CODE (cond) != INTEGER_CST) | |
4092 | cond = NULL_TREE; | |
4093 | ||
4094 | /* The time complexity here is O(N*lg(N)) worst case, but for the | |
4095 | common case of monotonically increasing enumerators, it is | |
4096 | O(N), since the nature of the splay tree will keep the next | |
4097 | element adjacent to the root at all times. */ | |
4ee9c684 | 4098 | |
359d87c6 | 4099 | for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) |
4100 | { | |
4101 | tree value = TREE_VALUE (chain); | |
4102 | node = splay_tree_lookup (cases, (splay_tree_key) value); | |
4103 | if (node) | |
4ee9c684 | 4104 | { |
359d87c6 | 4105 | /* Mark the CASE_LOW part of the case entry as seen. */ |
4106 | tree label = (tree) node->value; | |
4107 | CASE_LOW_SEEN (label) = 1; | |
4108 | continue; | |
4109 | } | |
4110 | ||
4111 | /* Even though there wasn't an exact match, there might be a | |
4112 | case range which includes the enumator's value. */ | |
4113 | node = splay_tree_predecessor (cases, (splay_tree_key) value); | |
4114 | if (node && CASE_HIGH ((tree) node->value)) | |
4115 | { | |
4116 | tree label = (tree) node->value; | |
4117 | int cmp = tree_int_cst_compare (CASE_HIGH (label), value); | |
4118 | if (cmp >= 0) | |
4ee9c684 | 4119 | { |
359d87c6 | 4120 | /* If we match the upper bound exactly, mark the CASE_HIGH |
4121 | part of the case entry as seen. */ | |
4122 | if (cmp == 0) | |
4123 | CASE_HIGH_SEEN (label) = 1; | |
4124 | continue; | |
4ee9c684 | 4125 | } |
4126 | } | |
4127 | ||
359d87c6 | 4128 | /* We've now determined that this enumerated literal isn't |
4129 | handled by the case labels of the switch statement. */ | |
4ee9c684 | 4130 | |
359d87c6 | 4131 | /* If the switch expression is a constant, we only really care |
4132 | about whether that constant is handled by the switch. */ | |
4133 | if (cond && tree_int_cst_compare (cond, value)) | |
4134 | continue; | |
4ee9c684 | 4135 | |
359d87c6 | 4136 | warning (0, "%Henumeration value %qE not handled in switch", |
4137 | &switch_location, TREE_PURPOSE (chain)); | |
4ee9c684 | 4138 | } |
359d87c6 | 4139 | |
4140 | /* Warn if there are case expressions that don't correspond to | |
4141 | enumerators. This can occur since C and C++ don't enforce | |
4142 | type-checking of assignments to enumeration variables. | |
4143 | ||
4144 | The time complexity here is now always O(N) worst case, since | |
4145 | we should have marked both the lower bound and upper bound of | |
4146 | every disjoint case label, with CASE_LOW_SEEN and CASE_HIGH_SEEN | |
4147 | above. This scan also resets those fields. */ | |
4148 | splay_tree_foreach (cases, match_case_to_enum, type); | |
e41f0d80 | 4149 | } |
4150 | ||
9dd48740 | 4151 | /* Finish an expression taking the address of LABEL (an |
4152 | IDENTIFIER_NODE). Returns an expression for the address. */ | |
d0a47c8d | 4153 | |
1cae46be | 4154 | tree |
4155 | finish_label_address_expr (tree label) | |
d0a47c8d | 4156 | { |
4157 | tree result; | |
4158 | ||
4159 | if (pedantic) | |
c0f19401 | 4160 | pedwarn ("taking the address of a label is non-standard"); |
d0a47c8d | 4161 | |
9dd48740 | 4162 | if (label == error_mark_node) |
4163 | return error_mark_node; | |
4164 | ||
d0a47c8d | 4165 | label = lookup_label (label); |
4166 | if (label == NULL_TREE) | |
4167 | result = null_pointer_node; | |
4168 | else | |
4169 | { | |
4170 | TREE_USED (label) = 1; | |
4171 | result = build1 (ADDR_EXPR, ptr_type_node, label); | |
d0a47c8d | 4172 | /* The current function in not necessarily uninlinable. |
4173 | Computed gotos are incompatible with inlining, but the value | |
4174 | here could be used only in a diagnostic, for example. */ | |
4175 | } | |
4176 | ||
4177 | return result; | |
4178 | } | |
4179 | ||
e41f0d80 | 4180 | /* Hook used by expand_expr to expand language-specific tree codes. */ |
b27ac6b5 | 4181 | /* The only things that should go here are bits needed to expand |
365db11e | 4182 | constant initializers. Everything else should be handled by the |
4ee9c684 | 4183 | gimplification routines. */ |
e41f0d80 | 4184 | |
4185 | rtx | |
b27ac6b5 | 4186 | c_expand_expr (tree exp, rtx target, enum machine_mode tmode, |
60ffaf4d | 4187 | int modifier /* Actually enum_modifier. */, |
4188 | rtx *alt_rtl) | |
e41f0d80 | 4189 | { |
4190 | switch (TREE_CODE (exp)) | |
4191 | { | |
ec11e38e | 4192 | case COMPOUND_LITERAL_EXPR: |
4193 | { | |
4194 | /* Initialize the anonymous variable declared in the compound | |
4195 | literal, then return the variable. */ | |
4196 | tree decl = COMPOUND_LITERAL_EXPR_DECL (exp); | |
4197 | emit_local_var (decl); | |
60ffaf4d | 4198 | return expand_expr_real (decl, target, tmode, modifier, alt_rtl); |
ec11e38e | 4199 | } |
4200 | ||
e41f0d80 | 4201 | default: |
231bd014 | 4202 | gcc_unreachable (); |
e41f0d80 | 4203 | } |
e41f0d80 | 4204 | } |
4205 | ||
ec11e38e | 4206 | /* Hook used by staticp to handle language-specific tree codes. */ |
4207 | ||
82e3f297 | 4208 | tree |
1cae46be | 4209 | c_staticp (tree exp) |
ec11e38e | 4210 | { |
82e3f297 | 4211 | return (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR |
4212 | && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp)) | |
4213 | ? exp : NULL); | |
ec11e38e | 4214 | } |
4f9a1c9b | 4215 | \f |
4216 | ||
4217 | /* Given a boolean expression ARG, return a tree representing an increment | |
4218 | or decrement (as indicated by CODE) of ARG. The front end must check for | |
4219 | invalid cases (e.g., decrement in C++). */ | |
4220 | tree | |
1cae46be | 4221 | boolean_increment (enum tree_code code, tree arg) |
4f9a1c9b | 4222 | { |
4223 | tree val; | |
3c2239cf | 4224 | tree true_res = boolean_true_node; |
c0f19401 | 4225 | |
4f9a1c9b | 4226 | arg = stabilize_reference (arg); |
4227 | switch (code) | |
4228 | { | |
4229 | case PREINCREMENT_EXPR: | |
14ae0310 | 4230 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
4f9a1c9b | 4231 | break; |
4232 | case POSTINCREMENT_EXPR: | |
14ae0310 | 4233 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
4f9a1c9b | 4234 | arg = save_expr (arg); |
14ae0310 | 4235 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
4236 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4f9a1c9b | 4237 | break; |
4238 | case PREDECREMENT_EXPR: | |
14ae0310 | 4239 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
4240 | invert_truthvalue (arg)); | |
4f9a1c9b | 4241 | break; |
4242 | case POSTDECREMENT_EXPR: | |
14ae0310 | 4243 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
4244 | invert_truthvalue (arg)); | |
4f9a1c9b | 4245 | arg = save_expr (arg); |
14ae0310 | 4246 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
4247 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
4f9a1c9b | 4248 | break; |
4249 | default: | |
231bd014 | 4250 | gcc_unreachable (); |
4f9a1c9b | 4251 | } |
4252 | TREE_SIDE_EFFECTS (val) = 1; | |
4253 | return val; | |
4254 | } | |
76a6e674 | 4255 | \f |
fd6f6435 | 4256 | /* Built-in macros for stddef.h, that require macros defined in this |
4257 | file. */ | |
79cf3ec1 | 4258 | void |
1cae46be | 4259 | c_stddef_cpp_builtins(void) |
1ed9d5f5 | 4260 | { |
63994318 | 4261 | builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); |
4262 | builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
4263 | builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
4264 | builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
36bccbfc | 4265 | builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0); |
4266 | builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0); | |
574006c3 | 4267 | } |
4268 | ||
7d3b509a | 4269 | static void |
1cae46be | 4270 | c_init_attributes (void) |
7d3b509a | 4271 | { |
4272 | /* Fill in the built_in_attributes array. */ | |
7c446c95 | 4273 | #define DEF_ATTR_NULL_TREE(ENUM) \ |
7d3b509a | 4274 | built_in_attributes[(int) ENUM] = NULL_TREE; |
7c446c95 | 4275 | #define DEF_ATTR_INT(ENUM, VALUE) \ |
7016c612 | 4276 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); |
7d3b509a | 4277 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
4278 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
4279 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
4280 | built_in_attributes[(int) ENUM] \ | |
4281 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
4282 | built_in_attributes[(int) VALUE], \ | |
4283 | built_in_attributes[(int) CHAIN]); | |
7d3b509a | 4284 | #include "builtin-attrs.def" |
4285 | #undef DEF_ATTR_NULL_TREE | |
4286 | #undef DEF_ATTR_INT | |
4287 | #undef DEF_ATTR_IDENT | |
4288 | #undef DEF_ATTR_TREE_LIST | |
76a6e674 | 4289 | } |
5f3cead1 | 4290 | |
f8e93a2e | 4291 | /* Attribute handlers common to C front ends. */ |
4292 | ||
4293 | /* Handle a "packed" attribute; arguments as in | |
4294 | struct attribute_spec.handler. */ | |
4295 | ||
4296 | static tree | |
9a03a746 | 4297 | handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
09347743 | 4298 | int flags, bool *no_add_attrs) |
f8e93a2e | 4299 | { |
f40175cb | 4300 | if (TYPE_P (*node)) |
f8e93a2e | 4301 | { |
4302 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 4303 | *node = build_variant_type_copy (*node); |
f40175cb | 4304 | TYPE_PACKED (*node) = 1; |
f8e93a2e | 4305 | } |
4306 | else if (TREE_CODE (*node) == FIELD_DECL) | |
c2ab04f9 | 4307 | { |
4308 | if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT) | |
4309 | warning (OPT_Wattributes, | |
4310 | "%qE attribute ignored for field of type %qT", | |
4311 | name, TREE_TYPE (*node)); | |
4312 | else | |
4313 | DECL_PACKED (*node) = 1; | |
4314 | } | |
f8e93a2e | 4315 | /* We can't set DECL_PACKED for a VAR_DECL, because the bit is |
f40175cb | 4316 | used for DECL_REGISTER. It wouldn't mean anything anyway. |
4317 | We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
4318 | that changes what the typedef is typing. */ | |
f8e93a2e | 4319 | else |
4320 | { | |
9b2d6d13 | 4321 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4322 | *no_add_attrs = true; |
4323 | } | |
4324 | ||
4325 | return NULL_TREE; | |
4326 | } | |
4327 | ||
4328 | /* Handle a "nocommon" attribute; arguments as in | |
4329 | struct attribute_spec.handler. */ | |
4330 | ||
4331 | static tree | |
1cae46be | 4332 | handle_nocommon_attribute (tree *node, tree name, |
9a03a746 | 4333 | tree ARG_UNUSED (args), |
4334 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4335 | { |
4336 | if (TREE_CODE (*node) == VAR_DECL) | |
4337 | DECL_COMMON (*node) = 0; | |
4338 | else | |
4339 | { | |
9b2d6d13 | 4340 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4341 | *no_add_attrs = true; |
4342 | } | |
4343 | ||
4344 | return NULL_TREE; | |
4345 | } | |
4346 | ||
4347 | /* Handle a "common" attribute; arguments as in | |
4348 | struct attribute_spec.handler. */ | |
4349 | ||
4350 | static tree | |
9a03a746 | 4351 | handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4352 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4353 | { |
4354 | if (TREE_CODE (*node) == VAR_DECL) | |
4355 | DECL_COMMON (*node) = 1; | |
4356 | else | |
4357 | { | |
9b2d6d13 | 4358 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4359 | *no_add_attrs = true; |
4360 | } | |
4361 | ||
4362 | return NULL_TREE; | |
4363 | } | |
4364 | ||
4365 | /* Handle a "noreturn" attribute; arguments as in | |
4366 | struct attribute_spec.handler. */ | |
4367 | ||
4368 | static tree | |
9a03a746 | 4369 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4370 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4371 | { |
4372 | tree type = TREE_TYPE (*node); | |
4373 | ||
4374 | /* See FIXME comment in c_common_attribute_table. */ | |
4375 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4376 | TREE_THIS_VOLATILE (*node) = 1; | |
4377 | else if (TREE_CODE (type) == POINTER_TYPE | |
4378 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4379 | TREE_TYPE (*node) | |
4380 | = build_pointer_type | |
4381 | (build_type_variant (TREE_TYPE (type), | |
71bda45d | 4382 | TYPE_READONLY (TREE_TYPE (type)), 1)); |
f8e93a2e | 4383 | else |
4384 | { | |
9b2d6d13 | 4385 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4386 | *no_add_attrs = true; |
4387 | } | |
4388 | ||
4389 | return NULL_TREE; | |
4390 | } | |
4391 | ||
4392 | /* Handle a "noinline" attribute; arguments as in | |
4393 | struct attribute_spec.handler. */ | |
4394 | ||
4395 | static tree | |
1cae46be | 4396 | handle_noinline_attribute (tree *node, tree name, |
9a03a746 | 4397 | tree ARG_UNUSED (args), |
4398 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4399 | { |
4400 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4401 | DECL_UNINLINABLE (*node) = 1; | |
4402 | else | |
4403 | { | |
9b2d6d13 | 4404 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4405 | *no_add_attrs = true; |
4406 | } | |
4407 | ||
4408 | return NULL_TREE; | |
4409 | } | |
4410 | ||
4411 | /* Handle a "always_inline" attribute; arguments as in | |
4412 | struct attribute_spec.handler. */ | |
4413 | ||
4414 | static tree | |
1cae46be | 4415 | handle_always_inline_attribute (tree *node, tree name, |
9a03a746 | 4416 | tree ARG_UNUSED (args), |
4417 | int ARG_UNUSED (flags), | |
09347743 | 4418 | bool *no_add_attrs) |
f8e93a2e | 4419 | { |
4420 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4421 | { | |
4422 | /* Do nothing else, just set the attribute. We'll get at | |
4423 | it later with lookup_attribute. */ | |
4424 | } | |
4425 | else | |
4426 | { | |
9b2d6d13 | 4427 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4428 | *no_add_attrs = true; |
541e4101 | 4429 | } |
4430 | ||
4431 | return NULL_TREE; | |
4432 | } | |
4433 | ||
4434 | /* Handle a "gnu_inline" attribute; arguments as in | |
4435 | struct attribute_spec.handler. */ | |
4436 | ||
4437 | static tree | |
4438 | handle_gnu_inline_attribute (tree *node, tree name, | |
4439 | tree ARG_UNUSED (args), | |
4440 | int ARG_UNUSED (flags), | |
4441 | bool *no_add_attrs) | |
4442 | { | |
4443 | if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) | |
4444 | { | |
4445 | /* Do nothing else, just set the attribute. We'll get at | |
4446 | it later with lookup_attribute. */ | |
4447 | } | |
4448 | else | |
4449 | { | |
4450 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4451 | *no_add_attrs = true; | |
f8e93a2e | 4452 | } |
4453 | ||
4454 | return NULL_TREE; | |
4455 | } | |
4456 | ||
0cdd9887 | 4457 | /* Handle a "flatten" attribute; arguments as in |
4458 | struct attribute_spec.handler. */ | |
4459 | ||
4460 | static tree | |
4461 | handle_flatten_attribute (tree *node, tree name, | |
a0c938f0 | 4462 | tree args ATTRIBUTE_UNUSED, |
4463 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) | |
0cdd9887 | 4464 | { |
4465 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4466 | /* Do nothing else, just set the attribute. We'll get at | |
4467 | it later with lookup_attribute. */ | |
4468 | ; | |
4469 | else | |
4470 | { | |
4471 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4472 | *no_add_attrs = true; | |
4473 | } | |
4474 | ||
4475 | return NULL_TREE; | |
4476 | } | |
4477 | ||
4478 | ||
f8e93a2e | 4479 | /* Handle a "used" attribute; arguments as in |
4480 | struct attribute_spec.handler. */ | |
4481 | ||
4482 | static tree | |
9a03a746 | 4483 | handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), |
4484 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4485 | { |
d0a31bd8 | 4486 | tree node = *pnode; |
4487 | ||
4488 | if (TREE_CODE (node) == FUNCTION_DECL | |
4489 | || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
f54ed8bc | 4490 | { |
f54ed8bc | 4491 | TREE_USED (node) = 1; |
9423c9b7 | 4492 | DECL_PRESERVE_P (node) = 1; |
f54ed8bc | 4493 | } |
f8e93a2e | 4494 | else |
4495 | { | |
9b2d6d13 | 4496 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4497 | *no_add_attrs = true; |
4498 | } | |
4499 | ||
4500 | return NULL_TREE; | |
4501 | } | |
4502 | ||
4503 | /* Handle a "unused" attribute; arguments as in | |
4504 | struct attribute_spec.handler. */ | |
4505 | ||
4506 | static tree | |
9a03a746 | 4507 | handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4508 | int flags, bool *no_add_attrs) | |
f8e93a2e | 4509 | { |
4510 | if (DECL_P (*node)) | |
4511 | { | |
4512 | tree decl = *node; | |
4513 | ||
4514 | if (TREE_CODE (decl) == PARM_DECL | |
4515 | || TREE_CODE (decl) == VAR_DECL | |
4516 | || TREE_CODE (decl) == FUNCTION_DECL | |
4517 | || TREE_CODE (decl) == LABEL_DECL | |
4518 | || TREE_CODE (decl) == TYPE_DECL) | |
4519 | TREE_USED (decl) = 1; | |
4520 | else | |
4521 | { | |
9b2d6d13 | 4522 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4523 | *no_add_attrs = true; |
4524 | } | |
4525 | } | |
4526 | else | |
4527 | { | |
4528 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 4529 | *node = build_variant_type_copy (*node); |
f8e93a2e | 4530 | TREE_USED (*node) = 1; |
4531 | } | |
4532 | ||
4533 | return NULL_TREE; | |
4534 | } | |
4535 | ||
62eec3b4 | 4536 | /* Handle a "externally_visible" attribute; arguments as in |
4537 | struct attribute_spec.handler. */ | |
4538 | ||
4539 | static tree | |
4540 | handle_externally_visible_attribute (tree *pnode, tree name, | |
4541 | tree ARG_UNUSED (args), | |
4542 | int ARG_UNUSED (flags), | |
4543 | bool *no_add_attrs) | |
4544 | { | |
4545 | tree node = *pnode; | |
4546 | ||
ba12ea31 | 4547 | if (TREE_CODE (node) == FUNCTION_DECL || TREE_CODE (node) == VAR_DECL) |
62eec3b4 | 4548 | { |
ba12ea31 | 4549 | if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL |
4550 | && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node)) | |
4551 | { | |
4552 | warning (OPT_Wattributes, | |
4553 | "%qE attribute have effect only on public objects", name); | |
4554 | *no_add_attrs = true; | |
4555 | } | |
62eec3b4 | 4556 | } |
62eec3b4 | 4557 | else |
4558 | { | |
4559 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4560 | *no_add_attrs = true; | |
4561 | } | |
4562 | ||
4563 | return NULL_TREE; | |
4564 | } | |
4565 | ||
f8e93a2e | 4566 | /* Handle a "const" attribute; arguments as in |
4567 | struct attribute_spec.handler. */ | |
4568 | ||
4569 | static tree | |
9a03a746 | 4570 | handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4571 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4572 | { |
4573 | tree type = TREE_TYPE (*node); | |
4574 | ||
4575 | /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
4576 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4577 | TREE_READONLY (*node) = 1; | |
4578 | else if (TREE_CODE (type) == POINTER_TYPE | |
4579 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4580 | TREE_TYPE (*node) | |
4581 | = build_pointer_type | |
4582 | (build_type_variant (TREE_TYPE (type), 1, | |
4583 | TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
4584 | else | |
4585 | { | |
9b2d6d13 | 4586 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4587 | *no_add_attrs = true; |
4588 | } | |
4589 | ||
4590 | return NULL_TREE; | |
4591 | } | |
4592 | ||
4593 | /* Handle a "transparent_union" attribute; arguments as in | |
4594 | struct attribute_spec.handler. */ | |
4595 | ||
4596 | static tree | |
1cae46be | 4597 | handle_transparent_union_attribute (tree *node, tree name, |
9a03a746 | 4598 | tree ARG_UNUSED (args), int flags, |
09347743 | 4599 | bool *no_add_attrs) |
f8e93a2e | 4600 | { |
03908818 | 4601 | tree type = NULL; |
4602 | ||
4603 | *no_add_attrs = true; | |
f8e93a2e | 4604 | |
4605 | if (DECL_P (*node)) | |
4606 | { | |
03908818 | 4607 | if (TREE_CODE (*node) != TYPE_DECL) |
4608 | goto ignored; | |
4609 | node = &TREE_TYPE (*node); | |
4610 | type = *node; | |
f8e93a2e | 4611 | } |
4612 | else if (TYPE_P (*node)) | |
03908818 | 4613 | type = *node; |
4614 | else | |
4615 | goto ignored; | |
f8e93a2e | 4616 | |
03908818 | 4617 | if (TREE_CODE (type) == UNION_TYPE) |
f8e93a2e | 4618 | { |
03908818 | 4619 | /* When IN_PLACE is set, leave the check for FIELDS and MODE to |
4620 | the code in finish_struct. */ | |
f8e93a2e | 4621 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) |
03908818 | 4622 | { |
4623 | if (TYPE_FIELDS (type) == NULL_TREE | |
4624 | || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type))) | |
4625 | goto ignored; | |
4626 | ||
4627 | /* A type variant isn't good enough, since we don't a cast | |
4628 | to such a type removed as a no-op. */ | |
4629 | *node = type = build_duplicate_type (type); | |
4630 | } | |
4631 | ||
4632 | TYPE_TRANSPARENT_UNION (type) = 1; | |
4633 | return NULL_TREE; | |
f8e93a2e | 4634 | } |
4635 | ||
03908818 | 4636 | ignored: |
4637 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
f8e93a2e | 4638 | return NULL_TREE; |
4639 | } | |
4640 | ||
4641 | /* Handle a "constructor" attribute; arguments as in | |
4642 | struct attribute_spec.handler. */ | |
4643 | ||
4644 | static tree | |
1cae46be | 4645 | handle_constructor_attribute (tree *node, tree name, |
9a03a746 | 4646 | tree ARG_UNUSED (args), |
4647 | int ARG_UNUSED (flags), | |
09347743 | 4648 | bool *no_add_attrs) |
f8e93a2e | 4649 | { |
4650 | tree decl = *node; | |
4651 | tree type = TREE_TYPE (decl); | |
4652 | ||
4653 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4654 | && TREE_CODE (type) == FUNCTION_TYPE | |
4655 | && decl_function_context (decl) == 0) | |
4656 | { | |
4657 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
4658 | TREE_USED (decl) = 1; | |
4659 | } | |
4660 | else | |
4661 | { | |
9b2d6d13 | 4662 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4663 | *no_add_attrs = true; |
4664 | } | |
4665 | ||
4666 | return NULL_TREE; | |
4667 | } | |
4668 | ||
4669 | /* Handle a "destructor" attribute; arguments as in | |
4670 | struct attribute_spec.handler. */ | |
4671 | ||
4672 | static tree | |
1cae46be | 4673 | handle_destructor_attribute (tree *node, tree name, |
9a03a746 | 4674 | tree ARG_UNUSED (args), |
4675 | int ARG_UNUSED (flags), | |
09347743 | 4676 | bool *no_add_attrs) |
f8e93a2e | 4677 | { |
4678 | tree decl = *node; | |
4679 | tree type = TREE_TYPE (decl); | |
4680 | ||
4681 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4682 | && TREE_CODE (type) == FUNCTION_TYPE | |
4683 | && decl_function_context (decl) == 0) | |
4684 | { | |
4685 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
4686 | TREE_USED (decl) = 1; | |
4687 | } | |
4688 | else | |
4689 | { | |
9b2d6d13 | 4690 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4691 | *no_add_attrs = true; |
4692 | } | |
4693 | ||
4694 | return NULL_TREE; | |
4695 | } | |
4696 | ||
4697 | /* Handle a "mode" attribute; arguments as in | |
4698 | struct attribute_spec.handler. */ | |
4699 | ||
4700 | static tree | |
9a03a746 | 4701 | handle_mode_attribute (tree *node, tree name, tree args, |
4702 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4703 | { |
4704 | tree type = *node; | |
4705 | ||
4706 | *no_add_attrs = true; | |
4707 | ||
4708 | if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) | |
9b2d6d13 | 4709 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 4710 | else |
4711 | { | |
4712 | int j; | |
4713 | const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); | |
4714 | int len = strlen (p); | |
4715 | enum machine_mode mode = VOIDmode; | |
4716 | tree typefm; | |
b2aef146 | 4717 | bool valid_mode; |
f8e93a2e | 4718 | |
4719 | if (len > 4 && p[0] == '_' && p[1] == '_' | |
4720 | && p[len - 1] == '_' && p[len - 2] == '_') | |
4721 | { | |
4fd61bc6 | 4722 | char *newp = (char *) alloca (len - 1); |
f8e93a2e | 4723 | |
4724 | strcpy (newp, &p[2]); | |
4725 | newp[len - 4] = '\0'; | |
4726 | p = newp; | |
4727 | } | |
4728 | ||
4729 | /* Change this type to have a type with the specified mode. | |
4730 | First check for the special modes. */ | |
84166705 | 4731 | if (!strcmp (p, "byte")) |
f8e93a2e | 4732 | mode = byte_mode; |
4733 | else if (!strcmp (p, "word")) | |
4734 | mode = word_mode; | |
84166705 | 4735 | else if (!strcmp (p, "pointer")) |
f8e93a2e | 4736 | mode = ptr_mode; |
4737 | else | |
4738 | for (j = 0; j < NUM_MACHINE_MODES; j++) | |
4739 | if (!strcmp (p, GET_MODE_NAME (j))) | |
743a6f47 | 4740 | { |
4741 | mode = (enum machine_mode) j; | |
4742 | break; | |
4743 | } | |
f8e93a2e | 4744 | |
4745 | if (mode == VOIDmode) | |
4917c376 | 4746 | { |
1e5fcbe2 | 4747 | error ("unknown machine mode %qs", p); |
4917c376 | 4748 | return NULL_TREE; |
4749 | } | |
4750 | ||
b2aef146 | 4751 | valid_mode = false; |
4752 | switch (GET_MODE_CLASS (mode)) | |
4917c376 | 4753 | { |
b2aef146 | 4754 | case MODE_INT: |
4755 | case MODE_PARTIAL_INT: | |
4756 | case MODE_FLOAT: | |
c4503c0a | 4757 | case MODE_DECIMAL_FLOAT: |
b2aef146 | 4758 | valid_mode = targetm.scalar_mode_supported_p (mode); |
4759 | break; | |
4760 | ||
4761 | case MODE_COMPLEX_INT: | |
4762 | case MODE_COMPLEX_FLOAT: | |
4763 | valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); | |
4764 | break; | |
4765 | ||
4766 | case MODE_VECTOR_INT: | |
4767 | case MODE_VECTOR_FLOAT: | |
9b2d6d13 | 4768 | warning (OPT_Wattributes, "specifying vector types with " |
4769 | "__attribute__ ((mode)) is deprecated"); | |
4770 | warning (OPT_Wattributes, | |
4771 | "use __attribute__ ((vector_size)) instead"); | |
b2aef146 | 4772 | valid_mode = vector_mode_valid_p (mode); |
4773 | break; | |
4917c376 | 4774 | |
b2aef146 | 4775 | default: |
4776 | break; | |
4777 | } | |
4778 | if (!valid_mode) | |
4779 | { | |
1e5fcbe2 | 4780 | error ("unable to emulate %qs", p); |
b2aef146 | 4781 | return NULL_TREE; |
4782 | } | |
4917c376 | 4783 | |
b2aef146 | 4784 | if (POINTER_TYPE_P (type)) |
ead34f59 | 4785 | { |
b2aef146 | 4786 | tree (*fn)(tree, enum machine_mode, bool); |
4787 | ||
4788 | if (!targetm.valid_pointer_mode (mode)) | |
ead34f59 | 4789 | { |
1e5fcbe2 | 4790 | error ("invalid pointer mode %qs", p); |
ead34f59 | 4791 | return NULL_TREE; |
4792 | } | |
4793 | ||
a0c938f0 | 4794 | if (TREE_CODE (type) == POINTER_TYPE) |
b2aef146 | 4795 | fn = build_pointer_type_for_mode; |
805e22b2 | 4796 | else |
b2aef146 | 4797 | fn = build_reference_type_for_mode; |
4798 | typefm = fn (TREE_TYPE (type), mode, false); | |
ead34f59 | 4799 | } |
b2aef146 | 4800 | else |
a0c938f0 | 4801 | typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type)); |
3a648ab9 | 4802 | |
b2aef146 | 4803 | if (typefm == NULL_TREE) |
4804 | { | |
743a6f47 | 4805 | error ("no data type for mode %qs", p); |
b2aef146 | 4806 | return NULL_TREE; |
4807 | } | |
3a648ab9 | 4808 | else if (TREE_CODE (type) == ENUMERAL_TYPE) |
4809 | { | |
4810 | /* For enumeral types, copy the precision from the integer | |
4811 | type returned above. If not an INTEGER_TYPE, we can't use | |
4812 | this mode for this type. */ | |
4813 | if (TREE_CODE (typefm) != INTEGER_TYPE) | |
4814 | { | |
743a6f47 | 4815 | error ("cannot use mode %qs for enumeral types", p); |
3a648ab9 | 4816 | return NULL_TREE; |
4817 | } | |
4818 | ||
10080eac | 4819 | if (flags & ATTR_FLAG_TYPE_IN_PLACE) |
4820 | { | |
4821 | TYPE_PRECISION (type) = TYPE_PRECISION (typefm); | |
4822 | typefm = type; | |
4823 | } | |
4824 | else | |
4825 | { | |
4826 | /* We cannot build a type variant, as there's code that assumes | |
4827 | that TYPE_MAIN_VARIANT has the same mode. This includes the | |
4828 | debug generators. Instead, create a subrange type. This | |
4829 | results in all of the enumeral values being emitted only once | |
4830 | in the original, and the subtype gets them by reference. */ | |
4831 | if (TYPE_UNSIGNED (type)) | |
4832 | typefm = make_unsigned_type (TYPE_PRECISION (typefm)); | |
4833 | else | |
4834 | typefm = make_signed_type (TYPE_PRECISION (typefm)); | |
4835 | TREE_TYPE (typefm) = type; | |
4836 | } | |
3a648ab9 | 4837 | } |
4bf450a1 | 4838 | else if (VECTOR_MODE_P (mode) |
4839 | ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) | |
4840 | : TREE_CODE (type) != TREE_CODE (typefm)) | |
743a6f47 | 4841 | { |
4842 | error ("mode %qs applied to inappropriate type", p); | |
4843 | return NULL_TREE; | |
4844 | } | |
4845 | ||
b2aef146 | 4846 | *node = typefm; |
f8e93a2e | 4847 | } |
4848 | ||
4849 | return NULL_TREE; | |
4850 | } | |
4851 | ||
4852 | /* Handle a "section" attribute; arguments as in | |
4853 | struct attribute_spec.handler. */ | |
4854 | ||
4855 | static tree | |
9a03a746 | 4856 | handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
4857 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4858 | { |
4859 | tree decl = *node; | |
4860 | ||
4861 | if (targetm.have_named_sections) | |
4862 | { | |
065efcb1 | 4863 | user_defined_section_attribute = true; |
4864 | ||
f8e93a2e | 4865 | if ((TREE_CODE (decl) == FUNCTION_DECL |
4866 | || TREE_CODE (decl) == VAR_DECL) | |
4867 | && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
4868 | { | |
4869 | if (TREE_CODE (decl) == VAR_DECL | |
4870 | && current_function_decl != NULL_TREE | |
84166705 | 4871 | && !TREE_STATIC (decl)) |
f8e93a2e | 4872 | { |
9bc3739f | 4873 | error ("%Jsection attribute cannot be specified for " |
4ee9c684 | 4874 | "local variables", decl); |
f8e93a2e | 4875 | *no_add_attrs = true; |
4876 | } | |
4877 | ||
4878 | /* The decl may have already been given a section attribute | |
4879 | from a previous declaration. Ensure they match. */ | |
4880 | else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
4881 | && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
4882 | TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
4883 | { | |
3cf8b391 | 4884 | error ("section of %q+D conflicts with previous declaration", |
4885 | *node); | |
f8e93a2e | 4886 | *no_add_attrs = true; |
4887 | } | |
4888 | else | |
4889 | DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
4890 | } | |
4891 | else | |
4892 | { | |
3cf8b391 | 4893 | error ("section attribute not allowed for %q+D", *node); |
f8e93a2e | 4894 | *no_add_attrs = true; |
4895 | } | |
4896 | } | |
4897 | else | |
4898 | { | |
9bc3739f | 4899 | error ("%Jsection attributes are not supported for this target", *node); |
f8e93a2e | 4900 | *no_add_attrs = true; |
4901 | } | |
4902 | ||
4903 | return NULL_TREE; | |
4904 | } | |
4905 | ||
4906 | /* Handle a "aligned" attribute; arguments as in | |
4907 | struct attribute_spec.handler. */ | |
4908 | ||
4909 | static tree | |
9a03a746 | 4910 | handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
09347743 | 4911 | int flags, bool *no_add_attrs) |
f8e93a2e | 4912 | { |
4913 | tree decl = NULL_TREE; | |
4914 | tree *type = NULL; | |
4915 | int is_type = 0; | |
4916 | tree align_expr = (args ? TREE_VALUE (args) | |
4917 | : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
4918 | int i; | |
4919 | ||
4920 | if (DECL_P (*node)) | |
4921 | { | |
4922 | decl = *node; | |
4923 | type = &TREE_TYPE (decl); | |
4924 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4925 | } | |
4926 | else if (TYPE_P (*node)) | |
4927 | type = node, is_type = 1; | |
4928 | ||
f8e93a2e | 4929 | if (TREE_CODE (align_expr) != INTEGER_CST) |
4930 | { | |
4931 | error ("requested alignment is not a constant"); | |
4932 | *no_add_attrs = true; | |
4933 | } | |
4934 | else if ((i = tree_log2 (align_expr)) == -1) | |
4935 | { | |
4936 | error ("requested alignment is not a power of 2"); | |
4937 | *no_add_attrs = true; | |
4938 | } | |
4939 | else if (i > HOST_BITS_PER_INT - 2) | |
4940 | { | |
4941 | error ("requested alignment is too large"); | |
4942 | *no_add_attrs = true; | |
4943 | } | |
4944 | else if (is_type) | |
4945 | { | |
4946 | /* If we have a TYPE_DECL, then copy the type, so that we | |
4947 | don't accidentally modify a builtin type. See pushdecl. */ | |
4948 | if (decl && TREE_TYPE (decl) != error_mark_node | |
4949 | && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
4950 | { | |
4951 | tree tt = TREE_TYPE (decl); | |
e086912e | 4952 | *type = build_variant_type_copy (*type); |
f8e93a2e | 4953 | DECL_ORIGINAL_TYPE (decl) = tt; |
4954 | TYPE_NAME (*type) = decl; | |
4955 | TREE_USED (*type) = TREE_USED (decl); | |
4956 | TREE_TYPE (decl) = *type; | |
4957 | } | |
4958 | else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 4959 | *type = build_variant_type_copy (*type); |
f8e93a2e | 4960 | |
4961 | TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT; | |
4962 | TYPE_USER_ALIGN (*type) = 1; | |
4963 | } | |
4964 | else if (TREE_CODE (decl) != VAR_DECL | |
4965 | && TREE_CODE (decl) != FIELD_DECL) | |
4966 | { | |
3cf8b391 | 4967 | error ("alignment may not be specified for %q+D", decl); |
f8e93a2e | 4968 | *no_add_attrs = true; |
4969 | } | |
4970 | else | |
4971 | { | |
4972 | DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT; | |
4973 | DECL_USER_ALIGN (decl) = 1; | |
4974 | } | |
4975 | ||
4976 | return NULL_TREE; | |
4977 | } | |
4978 | ||
4979 | /* Handle a "weak" attribute; arguments as in | |
4980 | struct attribute_spec.handler. */ | |
4981 | ||
4982 | static tree | |
f948b309 | 4983 | handle_weak_attribute (tree *node, tree name, |
9a03a746 | 4984 | tree ARG_UNUSED (args), |
4985 | int ARG_UNUSED (flags), | |
4986 | bool * ARG_UNUSED (no_add_attrs)) | |
f8e93a2e | 4987 | { |
f948b309 | 4988 | if (TREE_CODE (*node) == FUNCTION_DECL |
4989 | || TREE_CODE (*node) == VAR_DECL) | |
4990 | declare_weak (*node); | |
4991 | else | |
4992 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4993 | ||
f8e93a2e | 4994 | |
4995 | return NULL_TREE; | |
4996 | } | |
4997 | ||
4998 | /* Handle an "alias" attribute; arguments as in | |
4999 | struct attribute_spec.handler. */ | |
5000 | ||
5001 | static tree | |
1cae46be | 5002 | handle_alias_attribute (tree *node, tree name, tree args, |
9a03a746 | 5003 | int ARG_UNUSED (flags), bool *no_add_attrs) |
f8e93a2e | 5004 | { |
5005 | tree decl = *node; | |
5006 | ||
5007 | if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
0a3ecdc1 | 5008 | || (TREE_CODE (decl) != FUNCTION_DECL |
5009 | && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
5010 | /* A static variable declaration is always a tentative definition, | |
5011 | but the alias is a non-tentative definition which overrides. */ | |
5012 | || (TREE_CODE (decl) != FUNCTION_DECL | |
5013 | && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl))) | |
f8e93a2e | 5014 | { |
3cf8b391 | 5015 | error ("%q+D defined both normally and as an alias", decl); |
f8e93a2e | 5016 | *no_add_attrs = true; |
5017 | } | |
8c42f0d9 | 5018 | |
5019 | /* Note that the very first time we process a nested declaration, | |
5020 | decl_function_context will not be set. Indeed, *would* never | |
5021 | be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
5022 | we do below. After such frobbery, pushdecl would set the context. | |
5023 | In any case, this is never what we want. */ | |
5024 | else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
f8e93a2e | 5025 | { |
5026 | tree id; | |
5027 | ||
5028 | id = TREE_VALUE (args); | |
5029 | if (TREE_CODE (id) != STRING_CST) | |
5030 | { | |
07e3a3d2 | 5031 | error ("alias argument not a string"); |
f8e93a2e | 5032 | *no_add_attrs = true; |
5033 | return NULL_TREE; | |
5034 | } | |
5035 | id = get_identifier (TREE_STRING_POINTER (id)); | |
5036 | /* This counts as a use of the object pointed to. */ | |
5037 | TREE_USED (id) = 1; | |
5038 | ||
5039 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
5040 | DECL_INITIAL (decl) = error_mark_node; | |
5041 | else | |
4ee9c684 | 5042 | { |
f4a30bd7 | 5043 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))) |
5044 | DECL_EXTERNAL (decl) = 1; | |
5045 | else | |
5046 | DECL_EXTERNAL (decl) = 0; | |
4ee9c684 | 5047 | TREE_STATIC (decl) = 1; |
5048 | } | |
f8e93a2e | 5049 | } |
5050 | else | |
5051 | { | |
9b2d6d13 | 5052 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5053 | *no_add_attrs = true; |
5054 | } | |
5055 | ||
5056 | return NULL_TREE; | |
5057 | } | |
5058 | ||
f4a30bd7 | 5059 | /* Handle a "weakref" attribute; arguments as in struct |
5060 | attribute_spec.handler. */ | |
5061 | ||
5062 | static tree | |
5063 | handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
5064 | int flags, bool *no_add_attrs) | |
5065 | { | |
5066 | tree attr = NULL_TREE; | |
5067 | ||
83852912 | 5068 | /* We must ignore the attribute when it is associated with |
5069 | local-scoped decls, since attribute alias is ignored and many | |
5070 | such symbols do not even have a DECL_WEAK field. */ | |
5071 | if (decl_function_context (*node) || current_function_decl) | |
5072 | { | |
5073 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5074 | *no_add_attrs = true; | |
5075 | return NULL_TREE; | |
5076 | } | |
5077 | ||
f4a30bd7 | 5078 | /* The idea here is that `weakref("name")' mutates into `weakref, |
5079 | alias("name")', and weakref without arguments, in turn, | |
5080 | implicitly adds weak. */ | |
5081 | ||
5082 | if (args) | |
5083 | { | |
5084 | attr = tree_cons (get_identifier ("alias"), args, attr); | |
5085 | attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); | |
5086 | ||
5087 | *no_add_attrs = true; | |
0a3ecdc1 | 5088 | |
5089 | decl_attributes (node, attr, flags); | |
f4a30bd7 | 5090 | } |
5091 | else | |
5092 | { | |
5093 | if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) | |
5094 | error ("%Jweakref attribute must appear before alias attribute", | |
5095 | *node); | |
5096 | ||
0a3ecdc1 | 5097 | /* Can't call declare_weak because it wants this to be TREE_PUBLIC, |
5098 | and that isn't supported; and because it wants to add it to | |
5099 | the list of weak decls, which isn't helpful. */ | |
5100 | DECL_WEAK (*node) = 1; | |
f4a30bd7 | 5101 | } |
5102 | ||
f4a30bd7 | 5103 | return NULL_TREE; |
5104 | } | |
5105 | ||
f8e93a2e | 5106 | /* Handle an "visibility" attribute; arguments as in |
5107 | struct attribute_spec.handler. */ | |
5108 | ||
5109 | static tree | |
1cae46be | 5110 | handle_visibility_attribute (tree *node, tree name, tree args, |
9a03a746 | 5111 | int ARG_UNUSED (flags), |
4a2849cb | 5112 | bool *ARG_UNUSED (no_add_attrs)) |
f8e93a2e | 5113 | { |
5114 | tree decl = *node; | |
9c40570a | 5115 | tree id = TREE_VALUE (args); |
4a2849cb | 5116 | enum symbol_visibility vis; |
f8e93a2e | 5117 | |
b212f378 | 5118 | if (TYPE_P (*node)) |
5119 | { | |
4a2849cb | 5120 | if (TREE_CODE (*node) == ENUMERAL_TYPE) |
5121 | /* OK */; | |
5122 | else if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) | |
5123 | { | |
5124 | warning (OPT_Wattributes, "%qE attribute ignored on non-class types", | |
5125 | name); | |
5126 | return NULL_TREE; | |
5127 | } | |
5128 | else if (TYPE_FIELDS (*node)) | |
5129 | { | |
5130 | error ("%qE attribute ignored because %qT is already defined", | |
5131 | name, *node); | |
5132 | return NULL_TREE; | |
5133 | } | |
b212f378 | 5134 | } |
84166705 | 5135 | else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) |
f8e93a2e | 5136 | { |
9b2d6d13 | 5137 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
9c40570a | 5138 | return NULL_TREE; |
f8e93a2e | 5139 | } |
f8e93a2e | 5140 | |
9c40570a | 5141 | if (TREE_CODE (id) != STRING_CST) |
5142 | { | |
07e3a3d2 | 5143 | error ("visibility argument not a string"); |
9c40570a | 5144 | return NULL_TREE; |
f8e93a2e | 5145 | } |
b27ac6b5 | 5146 | |
b212f378 | 5147 | /* If this is a type, set the visibility on the type decl. */ |
5148 | if (TYPE_P (decl)) | |
5149 | { | |
5150 | decl = TYPE_NAME (decl); | |
84166705 | 5151 | if (!decl) |
a0c938f0 | 5152 | return NULL_TREE; |
e147aab3 | 5153 | if (TREE_CODE (decl) == IDENTIFIER_NODE) |
5154 | { | |
9b2d6d13 | 5155 | warning (OPT_Wattributes, "%qE attribute ignored on types", |
e147aab3 | 5156 | name); |
5157 | return NULL_TREE; | |
5158 | } | |
b212f378 | 5159 | } |
f8e93a2e | 5160 | |
9c40570a | 5161 | if (strcmp (TREE_STRING_POINTER (id), "default") == 0) |
4a2849cb | 5162 | vis = VISIBILITY_DEFAULT; |
9c40570a | 5163 | else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) |
4a2849cb | 5164 | vis = VISIBILITY_INTERNAL; |
9c40570a | 5165 | else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) |
4a2849cb | 5166 | vis = VISIBILITY_HIDDEN; |
9c40570a | 5167 | else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) |
4a2849cb | 5168 | vis = VISIBILITY_PROTECTED; |
9c40570a | 5169 | else |
4a2849cb | 5170 | { |
5171 | error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); | |
5172 | vis = VISIBILITY_DEFAULT; | |
5173 | } | |
5174 | ||
5175 | if (DECL_VISIBILITY_SPECIFIED (decl) | |
5176 | && vis != DECL_VISIBILITY (decl) | |
5177 | && lookup_attribute ("visibility", (TYPE_P (*node) | |
5178 | ? TYPE_ATTRIBUTES (*node) | |
5179 | : DECL_ATTRIBUTES (decl)))) | |
5180 | error ("%qD redeclared with different visibility", decl); | |
5181 | ||
5182 | DECL_VISIBILITY (decl) = vis; | |
b212f378 | 5183 | DECL_VISIBILITY_SPECIFIED (decl) = 1; |
5184 | ||
4a2849cb | 5185 | /* Go ahead and attach the attribute to the node as well. This is needed |
5186 | so we can determine whether we have VISIBILITY_DEFAULT because the | |
5187 | visibility was not specified, or because it was explicitly overridden | |
5188 | from the containing scope. */ | |
9c40570a | 5189 | |
f8e93a2e | 5190 | return NULL_TREE; |
5191 | } | |
5192 | ||
3aa0c315 | 5193 | /* Determine the ELF symbol visibility for DECL, which is either a |
5194 | variable or a function. It is an error to use this function if a | |
5195 | definition of DECL is not available in this translation unit. | |
5196 | Returns true if the final visibility has been determined by this | |
5197 | function; false if the caller is free to make additional | |
5198 | modifications. */ | |
5199 | ||
5200 | bool | |
5201 | c_determine_visibility (tree decl) | |
5202 | { | |
1d8fc210 | 5203 | gcc_assert (TREE_CODE (decl) == VAR_DECL |
5204 | || TREE_CODE (decl) == FUNCTION_DECL); | |
3aa0c315 | 5205 | |
5206 | /* If the user explicitly specified the visibility with an | |
5207 | attribute, honor that. DECL_VISIBILITY will have been set during | |
5208 | the processing of the attribute. We check for an explicit | |
5209 | attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, | |
5210 | to distinguish the use of an attribute from the use of a "#pragma | |
5211 | GCC visibility push(...)"; in the latter case we still want other | |
5212 | considerations to be able to overrule the #pragma. */ | |
5213 | if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))) | |
5214 | return true; | |
5215 | ||
5216 | /* Anything that is exported must have default visibility. */ | |
5217 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
5218 | && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) | |
5219 | { | |
5220 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
5221 | DECL_VISIBILITY_SPECIFIED (decl) = 1; | |
5222 | return true; | |
5223 | } | |
5224 | ||
4a2849cb | 5225 | /* Set default visibility to whatever the user supplied with |
5226 | visibility_specified depending on #pragma GCC visibility. */ | |
5227 | if (!DECL_VISIBILITY_SPECIFIED (decl)) | |
5228 | { | |
5229 | DECL_VISIBILITY (decl) = default_visibility; | |
5230 | DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; | |
5231 | } | |
3aa0c315 | 5232 | return false; |
5233 | } | |
5234 | ||
24dfead4 | 5235 | /* Handle an "tls_model" attribute; arguments as in |
5236 | struct attribute_spec.handler. */ | |
5237 | ||
5238 | static tree | |
1cae46be | 5239 | handle_tls_model_attribute (tree *node, tree name, tree args, |
9a03a746 | 5240 | int ARG_UNUSED (flags), bool *no_add_attrs) |
24dfead4 | 5241 | { |
1b53eb20 | 5242 | tree id; |
24dfead4 | 5243 | tree decl = *node; |
1b53eb20 | 5244 | enum tls_model kind; |
24dfead4 | 5245 | |
1b53eb20 | 5246 | *no_add_attrs = true; |
5247 | ||
5248 | if (!DECL_THREAD_LOCAL_P (decl)) | |
24dfead4 | 5249 | { |
9b2d6d13 | 5250 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
1b53eb20 | 5251 | return NULL_TREE; |
24dfead4 | 5252 | } |
24dfead4 | 5253 | |
1b53eb20 | 5254 | kind = DECL_TLS_MODEL (decl); |
5255 | id = TREE_VALUE (args); | |
5256 | if (TREE_CODE (id) != STRING_CST) | |
5257 | { | |
5258 | error ("tls_model argument not a string"); | |
5259 | return NULL_TREE; | |
24dfead4 | 5260 | } |
5261 | ||
1b53eb20 | 5262 | if (!strcmp (TREE_STRING_POINTER (id), "local-exec")) |
5263 | kind = TLS_MODEL_LOCAL_EXEC; | |
5264 | else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec")) | |
5265 | kind = TLS_MODEL_INITIAL_EXEC; | |
5266 | else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic")) | |
5267 | kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; | |
5268 | else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
5269 | kind = TLS_MODEL_GLOBAL_DYNAMIC; | |
5270 | else | |
5271 | error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
5272 | ||
5273 | DECL_TLS_MODEL (decl) = kind; | |
24dfead4 | 5274 | return NULL_TREE; |
5275 | } | |
5276 | ||
f8e93a2e | 5277 | /* Handle a "no_instrument_function" attribute; arguments as in |
5278 | struct attribute_spec.handler. */ | |
5279 | ||
5280 | static tree | |
1cae46be | 5281 | handle_no_instrument_function_attribute (tree *node, tree name, |
9a03a746 | 5282 | tree ARG_UNUSED (args), |
5283 | int ARG_UNUSED (flags), | |
09347743 | 5284 | bool *no_add_attrs) |
f8e93a2e | 5285 | { |
5286 | tree decl = *node; | |
5287 | ||
5288 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
5289 | { | |
b0b1af64 | 5290 | error ("%J%qE attribute applies only to functions", decl, name); |
f8e93a2e | 5291 | *no_add_attrs = true; |
5292 | } | |
5293 | else if (DECL_INITIAL (decl)) | |
5294 | { | |
b0b1af64 | 5295 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
f8e93a2e | 5296 | *no_add_attrs = true; |
5297 | } | |
5298 | else | |
5299 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
5300 | ||
5301 | return NULL_TREE; | |
5302 | } | |
5303 | ||
5304 | /* Handle a "malloc" attribute; arguments as in | |
5305 | struct attribute_spec.handler. */ | |
5306 | ||
5307 | static tree | |
9a03a746 | 5308 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5309 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5310 | { |
a5147fca | 5311 | if (TREE_CODE (*node) == FUNCTION_DECL |
5312 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
f8e93a2e | 5313 | DECL_IS_MALLOC (*node) = 1; |
f8e93a2e | 5314 | else |
5315 | { | |
9b2d6d13 | 5316 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5317 | *no_add_attrs = true; |
5318 | } | |
5319 | ||
5320 | return NULL_TREE; | |
5321 | } | |
5322 | ||
26d1c5ff | 5323 | /* Handle a "returns_twice" attribute; arguments as in |
5324 | struct attribute_spec.handler. */ | |
5325 | ||
5326 | static tree | |
5327 | handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5328 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5329 | { | |
5330 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5331 | DECL_IS_RETURNS_TWICE (*node) = 1; | |
5332 | else | |
5333 | { | |
9b2d6d13 | 5334 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
26d1c5ff | 5335 | *no_add_attrs = true; |
5336 | } | |
5337 | ||
5338 | return NULL_TREE; | |
5339 | } | |
5340 | ||
f8e93a2e | 5341 | /* Handle a "no_limit_stack" attribute; arguments as in |
5342 | struct attribute_spec.handler. */ | |
5343 | ||
5344 | static tree | |
1cae46be | 5345 | handle_no_limit_stack_attribute (tree *node, tree name, |
9a03a746 | 5346 | tree ARG_UNUSED (args), |
5347 | int ARG_UNUSED (flags), | |
09347743 | 5348 | bool *no_add_attrs) |
f8e93a2e | 5349 | { |
5350 | tree decl = *node; | |
5351 | ||
5352 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
5353 | { | |
b0b1af64 | 5354 | error ("%J%qE attribute applies only to functions", decl, name); |
f8e93a2e | 5355 | *no_add_attrs = true; |
5356 | } | |
5357 | else if (DECL_INITIAL (decl)) | |
5358 | { | |
b0b1af64 | 5359 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
f8e93a2e | 5360 | *no_add_attrs = true; |
5361 | } | |
5362 | else | |
5363 | DECL_NO_LIMIT_STACK (decl) = 1; | |
5364 | ||
5365 | return NULL_TREE; | |
5366 | } | |
5367 | ||
5368 | /* Handle a "pure" attribute; arguments as in | |
5369 | struct attribute_spec.handler. */ | |
5370 | ||
5371 | static tree | |
9a03a746 | 5372 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5373 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 5374 | { |
5375 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5376 | DECL_IS_PURE (*node) = 1; | |
5377 | /* ??? TODO: Support types. */ | |
5378 | else | |
5379 | { | |
9b2d6d13 | 5380 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5381 | *no_add_attrs = true; |
5382 | } | |
5383 | ||
5384 | return NULL_TREE; | |
5385 | } | |
5386 | ||
fc09b200 | 5387 | /* Handle a "no vops" attribute; arguments as in |
5388 | struct attribute_spec.handler. */ | |
5389 | ||
5390 | static tree | |
5391 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
5392 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5393 | bool *ARG_UNUSED (no_add_attrs)) | |
5394 | { | |
5395 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
5396 | DECL_IS_NOVOPS (*node) = 1; | |
5397 | return NULL_TREE; | |
5398 | } | |
5399 | ||
f8e93a2e | 5400 | /* Handle a "deprecated" attribute; arguments as in |
5401 | struct attribute_spec.handler. */ | |
1cae46be | 5402 | |
f8e93a2e | 5403 | static tree |
1cae46be | 5404 | handle_deprecated_attribute (tree *node, tree name, |
9a03a746 | 5405 | tree ARG_UNUSED (args), int flags, |
09347743 | 5406 | bool *no_add_attrs) |
f8e93a2e | 5407 | { |
5408 | tree type = NULL_TREE; | |
5409 | int warn = 0; | |
782858b8 | 5410 | tree what = NULL_TREE; |
1cae46be | 5411 | |
f8e93a2e | 5412 | if (DECL_P (*node)) |
5413 | { | |
5414 | tree decl = *node; | |
5415 | type = TREE_TYPE (decl); | |
1cae46be | 5416 | |
f8e93a2e | 5417 | if (TREE_CODE (decl) == TYPE_DECL |
5418 | || TREE_CODE (decl) == PARM_DECL | |
5419 | || TREE_CODE (decl) == VAR_DECL | |
5420 | || TREE_CODE (decl) == FUNCTION_DECL | |
5421 | || TREE_CODE (decl) == FIELD_DECL) | |
5422 | TREE_DEPRECATED (decl) = 1; | |
5423 | else | |
5424 | warn = 1; | |
5425 | } | |
5426 | else if (TYPE_P (*node)) | |
5427 | { | |
5428 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
e086912e | 5429 | *node = build_variant_type_copy (*node); |
f8e93a2e | 5430 | TREE_DEPRECATED (*node) = 1; |
5431 | type = *node; | |
5432 | } | |
5433 | else | |
5434 | warn = 1; | |
1cae46be | 5435 | |
f8e93a2e | 5436 | if (warn) |
5437 | { | |
5438 | *no_add_attrs = true; | |
5439 | if (type && TYPE_NAME (type)) | |
5440 | { | |
5441 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
782858b8 | 5442 | what = TYPE_NAME (*node); |
f8e93a2e | 5443 | else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL |
5444 | && DECL_NAME (TYPE_NAME (type))) | |
782858b8 | 5445 | what = DECL_NAME (TYPE_NAME (type)); |
f8e93a2e | 5446 | } |
5447 | if (what) | |
9b2d6d13 | 5448 | warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what); |
f8e93a2e | 5449 | else |
9b2d6d13 | 5450 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5451 | } |
5452 | ||
5453 | return NULL_TREE; | |
5454 | } | |
5455 | ||
f8e93a2e | 5456 | /* Handle a "vector_size" attribute; arguments as in |
5457 | struct attribute_spec.handler. */ | |
5458 | ||
5459 | static tree | |
1cae46be | 5460 | handle_vector_size_attribute (tree *node, tree name, tree args, |
9a03a746 | 5461 | int ARG_UNUSED (flags), |
09347743 | 5462 | bool *no_add_attrs) |
f8e93a2e | 5463 | { |
5464 | unsigned HOST_WIDE_INT vecsize, nunits; | |
83e2a11b | 5465 | enum machine_mode orig_mode; |
4917c376 | 5466 | tree type = *node, new_type, size; |
f8e93a2e | 5467 | |
5468 | *no_add_attrs = true; | |
5469 | ||
4917c376 | 5470 | size = TREE_VALUE (args); |
4917c376 | 5471 | |
84166705 | 5472 | if (!host_integerp (size, 1)) |
f8e93a2e | 5473 | { |
9b2d6d13 | 5474 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
f8e93a2e | 5475 | return NULL_TREE; |
5476 | } | |
5477 | ||
5478 | /* Get the vector size (in bytes). */ | |
4917c376 | 5479 | vecsize = tree_low_cst (size, 1); |
f8e93a2e | 5480 | |
5481 | /* We need to provide for vector pointers, vector arrays, and | |
5482 | functions returning vectors. For example: | |
5483 | ||
5484 | __attribute__((vector_size(16))) short *foo; | |
5485 | ||
5486 | In this case, the mode is SI, but the type being modified is | |
5487 | HI, so we need to look further. */ | |
5488 | ||
5489 | while (POINTER_TYPE_P (type) | |
5490 | || TREE_CODE (type) == FUNCTION_TYPE | |
5bfb0742 | 5491 | || TREE_CODE (type) == METHOD_TYPE |
f8e93a2e | 5492 | || TREE_CODE (type) == ARRAY_TYPE) |
5493 | type = TREE_TYPE (type); | |
5494 | ||
5495 | /* Get the mode of the type being modified. */ | |
5496 | orig_mode = TYPE_MODE (type); | |
5497 | ||
5498 | if (TREE_CODE (type) == RECORD_TYPE | |
5ceb27aa | 5499 | || TREE_CODE (type) == UNION_TYPE |
5500 | || TREE_CODE (type) == VECTOR_TYPE | |
cee7491d | 5501 | || (!SCALAR_FLOAT_MODE_P (orig_mode) |
f8e93a2e | 5502 | && GET_MODE_CLASS (orig_mode) != MODE_INT) |
84166705 | 5503 | || !host_integerp (TYPE_SIZE_UNIT (type), 1)) |
f8e93a2e | 5504 | { |
782858b8 | 5505 | error ("invalid vector type for attribute %qE", name); |
f8e93a2e | 5506 | return NULL_TREE; |
5507 | } | |
5508 | ||
39cc3e6d | 5509 | if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) |
5510 | { | |
5511 | error ("vector size not an integral multiple of component size"); | |
5512 | return NULL; | |
5513 | } | |
5514 | ||
5515 | if (vecsize == 0) | |
5516 | { | |
5517 | error ("zero vector size"); | |
5518 | return NULL; | |
5519 | } | |
5520 | ||
f8e93a2e | 5521 | /* Calculate how many units fit in the vector. */ |
5522 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
83e2a11b | 5523 | if (nunits & (nunits - 1)) |
f8e93a2e | 5524 | { |
83e2a11b | 5525 | error ("number of components of the vector not a power of two"); |
f8e93a2e | 5526 | return NULL_TREE; |
5527 | } | |
5528 | ||
83e2a11b | 5529 | new_type = build_vector_type (type, nunits); |
f8e93a2e | 5530 | |
5531 | /* Build back pointers if needed. */ | |
409a160c | 5532 | *node = reconstruct_complex_type (*node, new_type); |
f8e93a2e | 5533 | |
5534 | return NULL_TREE; | |
5535 | } | |
5536 | ||
dbf6c367 | 5537 | /* Handle the "nonnull" attribute. */ |
5538 | static tree | |
9a03a746 | 5539 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), |
5540 | tree args, int ARG_UNUSED (flags), | |
09347743 | 5541 | bool *no_add_attrs) |
dbf6c367 | 5542 | { |
5543 | tree type = *node; | |
5544 | unsigned HOST_WIDE_INT attr_arg_num; | |
5545 | ||
5546 | /* If no arguments are specified, all pointer arguments should be | |
d716ce75 | 5547 | non-null. Verify a full prototype is given so that the arguments |
dbf6c367 | 5548 | will have the correct types when we actually check them later. */ |
84166705 | 5549 | if (!args) |
dbf6c367 | 5550 | { |
84166705 | 5551 | if (!TYPE_ARG_TYPES (type)) |
dbf6c367 | 5552 | { |
5553 | error ("nonnull attribute without arguments on a non-prototype"); | |
4ee9c684 | 5554 | *no_add_attrs = true; |
dbf6c367 | 5555 | } |
5556 | return NULL_TREE; | |
5557 | } | |
5558 | ||
5559 | /* Argument list specified. Verify that each argument number references | |
5560 | a pointer argument. */ | |
5561 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
5562 | { | |
5563 | tree argument; | |
4ee9c684 | 5564 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
dbf6c367 | 5565 | |
84166705 | 5566 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) |
dbf6c367 | 5567 | { |
07e3a3d2 | 5568 | error ("nonnull argument has invalid operand number (argument %lu)", |
dbf6c367 | 5569 | (unsigned long) attr_arg_num); |
5570 | *no_add_attrs = true; | |
5571 | return NULL_TREE; | |
5572 | } | |
5573 | ||
5574 | argument = TYPE_ARG_TYPES (type); | |
5575 | if (argument) | |
5576 | { | |
5577 | for (ck_num = 1; ; ck_num++) | |
5578 | { | |
84166705 | 5579 | if (!argument || ck_num == arg_num) |
dbf6c367 | 5580 | break; |
5581 | argument = TREE_CHAIN (argument); | |
5582 | } | |
5583 | ||
84166705 | 5584 | if (!argument |
dbf6c367 | 5585 | || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
5586 | { | |
07e3a3d2 | 5587 | error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)", |
dbf6c367 | 5588 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5589 | *no_add_attrs = true; | |
5590 | return NULL_TREE; | |
5591 | } | |
5592 | ||
4ee9c684 | 5593 | if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
dbf6c367 | 5594 | { |
07e3a3d2 | 5595 | error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)", |
dbf6c367 | 5596 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5597 | *no_add_attrs = true; | |
5598 | return NULL_TREE; | |
5599 | } | |
5600 | } | |
5601 | } | |
5602 | ||
5603 | return NULL_TREE; | |
5604 | } | |
5605 | ||
5606 | /* Check the argument list of a function call for null in argument slots | |
5607 | that are marked as requiring a non-null pointer argument. */ | |
5608 | ||
5609 | static void | |
1cae46be | 5610 | check_function_nonnull (tree attrs, tree params) |
dbf6c367 | 5611 | { |
5612 | tree a, args, param; | |
5613 | int param_num; | |
5614 | ||
5615 | for (a = attrs; a; a = TREE_CHAIN (a)) | |
5616 | { | |
5617 | if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
5618 | { | |
4ee9c684 | 5619 | args = TREE_VALUE (a); |
dbf6c367 | 5620 | |
4ee9c684 | 5621 | /* Walk the argument list. If we encounter an argument number we |
5622 | should check for non-null, do it. If the attribute has no args, | |
5623 | then every pointer argument is checked (in which case the check | |
dbf6c367 | 5624 | for pointer type is done in check_nonnull_arg). */ |
4ee9c684 | 5625 | for (param = params, param_num = 1; ; |
5626 | param_num++, param = TREE_CHAIN (param)) | |
5627 | { | |
84166705 | 5628 | if (!param) |
e4603171 | 5629 | break; |
84166705 | 5630 | if (!args || nonnull_check_p (args, param_num)) |
e4603171 | 5631 | check_function_arguments_recurse (check_nonnull_arg, NULL, |
5632 | TREE_VALUE (param), | |
5633 | param_num); | |
4ee9c684 | 5634 | } |
dbf6c367 | 5635 | } |
5636 | } | |
5637 | } | |
5638 | ||
50ca527f | 5639 | /* Check that the Nth argument of a function call (counting backwards |
5640 | from the end) is a (pointer)0. */ | |
bf6c8de0 | 5641 | |
5642 | static void | |
5f168e43 | 5643 | check_function_sentinel (tree attrs, tree params, tree typelist) |
bf6c8de0 | 5644 | { |
5645 | tree attr = lookup_attribute ("sentinel", attrs); | |
5646 | ||
5647 | if (attr) | |
5648 | { | |
5f168e43 | 5649 | /* Skip over the named arguments. */ |
5650 | while (typelist && params) | |
5651 | { | |
5652 | typelist = TREE_CHAIN (typelist); | |
5653 | params = TREE_CHAIN (params); | |
5654 | } | |
a0c938f0 | 5655 | |
5f168e43 | 5656 | if (typelist || !params) |
155b601b | 5657 | warning (OPT_Wformat, |
5658 | "not enough variable arguments to fit a sentinel"); | |
bf6c8de0 | 5659 | else |
a0c938f0 | 5660 | { |
50ca527f | 5661 | tree sentinel, end; |
5662 | unsigned pos = 0; | |
a0c938f0 | 5663 | |
50ca527f | 5664 | if (TREE_VALUE (attr)) |
5665 | { | |
5666 | tree p = TREE_VALUE (TREE_VALUE (attr)); | |
50ca527f | 5667 | pos = TREE_INT_CST_LOW (p); |
5668 | } | |
5669 | ||
5670 | sentinel = end = params; | |
5671 | ||
5672 | /* Advance `end' ahead of `sentinel' by `pos' positions. */ | |
5673 | while (pos > 0 && TREE_CHAIN (end)) | |
5674 | { | |
5675 | pos--; | |
5676 | end = TREE_CHAIN (end); | |
5677 | } | |
5678 | if (pos > 0) | |
5679 | { | |
155b601b | 5680 | warning (OPT_Wformat, |
5681 | "not enough variable arguments to fit a sentinel"); | |
50ca527f | 5682 | return; |
5683 | } | |
5684 | ||
5685 | /* Now advance both until we find the last parameter. */ | |
5686 | while (TREE_CHAIN (end)) | |
5687 | { | |
5688 | end = TREE_CHAIN (end); | |
5689 | sentinel = TREE_CHAIN (sentinel); | |
5690 | } | |
5691 | ||
5692 | /* Validate the sentinel. */ | |
ae84079f | 5693 | if ((!POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (sentinel))) |
5694 | || !integer_zerop (TREE_VALUE (sentinel))) | |
5695 | /* Although __null (in C++) is only an integer we allow it | |
5696 | nevertheless, as we are guaranteed that it's exactly | |
5697 | as wide as a pointer, and we don't want to force | |
5698 | users to cast the NULL they have written there. | |
5699 | We warn with -Wstrict-null-sentinel, though. */ | |
a0c938f0 | 5700 | && (warn_strict_null_sentinel |
ae84079f | 5701 | || null_node != TREE_VALUE (sentinel))) |
155b601b | 5702 | warning (OPT_Wformat, "missing sentinel in function call"); |
bf6c8de0 | 5703 | } |
5704 | } | |
5705 | } | |
5706 | ||
dbf6c367 | 5707 | /* Helper for check_function_nonnull; given a list of operands which |
5708 | must be non-null in ARGS, determine if operand PARAM_NUM should be | |
5709 | checked. */ | |
5710 | ||
5711 | static bool | |
1cae46be | 5712 | nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 5713 | { |
4ee9c684 | 5714 | unsigned HOST_WIDE_INT arg_num = 0; |
dbf6c367 | 5715 | |
5716 | for (; args; args = TREE_CHAIN (args)) | |
5717 | { | |
231bd014 | 5718 | bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); |
5719 | ||
5720 | gcc_assert (found); | |
dbf6c367 | 5721 | |
5722 | if (arg_num == param_num) | |
5723 | return true; | |
5724 | } | |
5725 | return false; | |
5726 | } | |
5727 | ||
5728 | /* Check that the function argument PARAM (which is operand number | |
5729 | PARAM_NUM) is non-null. This is called by check_function_nonnull | |
5730 | via check_function_arguments_recurse. */ | |
5731 | ||
5732 | static void | |
9a03a746 | 5733 | check_nonnull_arg (void * ARG_UNUSED (ctx), tree param, |
1cae46be | 5734 | unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 5735 | { |
5736 | /* Just skip checking the argument if it's not a pointer. This can | |
5737 | happen if the "nonnull" attribute was given without an operand | |
5738 | list (which means to check every pointer argument). */ | |
5739 | ||
5740 | if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
5741 | return; | |
5742 | ||
5743 | if (integer_zerop (param)) | |
155b601b | 5744 | warning (OPT_Wnonnull, "null argument where non-null required " |
5745 | "(argument %lu)", (unsigned long) param_num); | |
dbf6c367 | 5746 | } |
5747 | ||
5748 | /* Helper for nonnull attribute handling; fetch the operand number | |
5749 | from the attribute argument list. */ | |
5750 | ||
5751 | static bool | |
1cae46be | 5752 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
dbf6c367 | 5753 | { |
67409385 | 5754 | /* Verify the arg number is a constant. */ |
dbf6c367 | 5755 | if (TREE_CODE (arg_num_expr) != INTEGER_CST |
5756 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
5757 | return false; | |
5758 | ||
5759 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5760 | return true; | |
5761 | } | |
fa987697 | 5762 | |
5763 | /* Handle a "nothrow" attribute; arguments as in | |
5764 | struct attribute_spec.handler. */ | |
5765 | ||
5766 | static tree | |
9a03a746 | 5767 | handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5768 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
fa987697 | 5769 | { |
5770 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5771 | TREE_NOTHROW (*node) = 1; | |
5772 | /* ??? TODO: Support types. */ | |
5773 | else | |
5774 | { | |
9b2d6d13 | 5775 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
fa987697 | 5776 | *no_add_attrs = true; |
5777 | } | |
5778 | ||
5779 | return NULL_TREE; | |
5780 | } | |
7acb29a3 | 5781 | |
5782 | /* Handle a "cleanup" attribute; arguments as in | |
5783 | struct attribute_spec.handler. */ | |
5784 | ||
5785 | static tree | |
1cae46be | 5786 | handle_cleanup_attribute (tree *node, tree name, tree args, |
9a03a746 | 5787 | int ARG_UNUSED (flags), bool *no_add_attrs) |
7acb29a3 | 5788 | { |
5789 | tree decl = *node; | |
5790 | tree cleanup_id, cleanup_decl; | |
5791 | ||
5792 | /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
5793 | for global destructors in C++. This requires infrastructure that | |
5794 | we don't have generically at the moment. It's also not a feature | |
5795 | we'd be missing too much, since we do have attribute constructor. */ | |
5796 | if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
5797 | { | |
9b2d6d13 | 5798 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
7acb29a3 | 5799 | *no_add_attrs = true; |
5800 | return NULL_TREE; | |
5801 | } | |
5802 | ||
5803 | /* Verify that the argument is a function in scope. */ | |
5804 | /* ??? We could support pointers to functions here as well, if | |
5805 | that was considered desirable. */ | |
5806 | cleanup_id = TREE_VALUE (args); | |
5807 | if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
5808 | { | |
07e3a3d2 | 5809 | error ("cleanup argument not an identifier"); |
7acb29a3 | 5810 | *no_add_attrs = true; |
5811 | return NULL_TREE; | |
5812 | } | |
d1c41717 | 5813 | cleanup_decl = lookup_name (cleanup_id); |
7acb29a3 | 5814 | if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) |
5815 | { | |
07e3a3d2 | 5816 | error ("cleanup argument not a function"); |
7acb29a3 | 5817 | *no_add_attrs = true; |
5818 | return NULL_TREE; | |
5819 | } | |
5820 | ||
1cae46be | 5821 | /* That the function has proper type is checked with the |
7acb29a3 | 5822 | eventual call to build_function_call. */ |
5823 | ||
5824 | return NULL_TREE; | |
5825 | } | |
8a8cdb8d | 5826 | |
5827 | /* Handle a "warn_unused_result" attribute. No special handling. */ | |
5828 | ||
5829 | static tree | |
5830 | handle_warn_unused_result_attribute (tree *node, tree name, | |
9a03a746 | 5831 | tree ARG_UNUSED (args), |
5832 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
8a8cdb8d | 5833 | { |
5834 | /* Ignore the attribute for functions not returning any value. */ | |
5835 | if (VOID_TYPE_P (TREE_TYPE (*node))) | |
5836 | { | |
9b2d6d13 | 5837 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
8a8cdb8d | 5838 | *no_add_attrs = true; |
5839 | } | |
5840 | ||
5841 | return NULL_TREE; | |
5842 | } | |
bf6c8de0 | 5843 | |
5844 | /* Handle a "sentinel" attribute. */ | |
5845 | ||
5846 | static tree | |
50ca527f | 5847 | handle_sentinel_attribute (tree *node, tree name, tree args, |
bf6c8de0 | 5848 | int ARG_UNUSED (flags), bool *no_add_attrs) |
5849 | { | |
5850 | tree params = TYPE_ARG_TYPES (*node); | |
5851 | ||
5852 | if (!params) | |
5853 | { | |
9b2d6d13 | 5854 | warning (OPT_Wattributes, |
5855 | "%qE attribute requires prototypes with named arguments", name); | |
bf6c8de0 | 5856 | *no_add_attrs = true; |
bf6c8de0 | 5857 | } |
50ca527f | 5858 | else |
5859 | { | |
5860 | while (TREE_CHAIN (params)) | |
5861 | params = TREE_CHAIN (params); | |
bf6c8de0 | 5862 | |
50ca527f | 5863 | if (VOID_TYPE_P (TREE_VALUE (params))) |
a0c938f0 | 5864 | { |
9b2d6d13 | 5865 | warning (OPT_Wattributes, |
5866 | "%qE attribute only applies to variadic functions", name); | |
50ca527f | 5867 | *no_add_attrs = true; |
5868 | } | |
5869 | } | |
a0c938f0 | 5870 | |
50ca527f | 5871 | if (args) |
bf6c8de0 | 5872 | { |
50ca527f | 5873 | tree position = TREE_VALUE (args); |
5874 | ||
50ca527f | 5875 | if (TREE_CODE (position) != INTEGER_CST) |
a0c938f0 | 5876 | { |
c3ceba8e | 5877 | warning (0, "requested position is not an integer constant"); |
50ca527f | 5878 | *no_add_attrs = true; |
5879 | } | |
5880 | else | |
a0c938f0 | 5881 | { |
50ca527f | 5882 | if (tree_int_cst_lt (position, integer_zero_node)) |
5883 | { | |
c3ceba8e | 5884 | warning (0, "requested position is less than zero"); |
50ca527f | 5885 | *no_add_attrs = true; |
5886 | } | |
5887 | } | |
bf6c8de0 | 5888 | } |
a0c938f0 | 5889 | |
bf6c8de0 | 5890 | return NULL_TREE; |
5891 | } | |
dbf6c367 | 5892 | \f |
5893 | /* Check for valid arguments being passed to a function. */ | |
5894 | void | |
5f168e43 | 5895 | check_function_arguments (tree attrs, tree params, tree typelist) |
dbf6c367 | 5896 | { |
5897 | /* Check for null being passed in a pointer argument that must be | |
5898 | non-null. We also need to do this if format checking is enabled. */ | |
5899 | ||
5900 | if (warn_nonnull) | |
5901 | check_function_nonnull (attrs, params); | |
5902 | ||
5903 | /* Check for errors in format strings. */ | |
5904 | ||
95c90e04 | 5905 | if (warn_format || warn_missing_format_attribute) |
bf6c8de0 | 5906 | check_function_format (attrs, params); |
95c90e04 | 5907 | |
5908 | if (warn_format) | |
5909 | check_function_sentinel (attrs, params, typelist); | |
dbf6c367 | 5910 | } |
5911 | ||
5912 | /* Generic argument checking recursion routine. PARAM is the argument to | |
5913 | be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
5914 | once the argument is resolved. CTX is context for the callback. */ | |
5915 | void | |
1cae46be | 5916 | check_function_arguments_recurse (void (*callback) |
5917 | (void *, tree, unsigned HOST_WIDE_INT), | |
5918 | void *ctx, tree param, | |
5919 | unsigned HOST_WIDE_INT param_num) | |
dbf6c367 | 5920 | { |
c44afe23 | 5921 | if ((TREE_CODE (param) == NOP_EXPR || TREE_CODE (param) == CONVERT_EXPR) |
5922 | && (TYPE_PRECISION (TREE_TYPE (param)) | |
5923 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (param, 0))))) | |
dbf6c367 | 5924 | { |
5925 | /* Strip coercion. */ | |
5926 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 5927 | TREE_OPERAND (param, 0), param_num); |
dbf6c367 | 5928 | return; |
5929 | } | |
5930 | ||
5931 | if (TREE_CODE (param) == CALL_EXPR) | |
5932 | { | |
5933 | tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0))); | |
5934 | tree attrs; | |
5935 | bool found_format_arg = false; | |
5936 | ||
5937 | /* See if this is a call to a known internationalization function | |
5938 | that modifies a format arg. Such a function may have multiple | |
5939 | format_arg attributes (for example, ngettext). */ | |
5940 | ||
5941 | for (attrs = TYPE_ATTRIBUTES (type); | |
5942 | attrs; | |
5943 | attrs = TREE_CHAIN (attrs)) | |
5944 | if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
5945 | { | |
5946 | tree inner_args; | |
5947 | tree format_num_expr; | |
5948 | int format_num; | |
5949 | int i; | |
5950 | ||
5951 | /* Extract the argument number, which was previously checked | |
5952 | to be valid. */ | |
5953 | format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
dbf6c367 | 5954 | |
231bd014 | 5955 | gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST |
5956 | && !TREE_INT_CST_HIGH (format_num_expr)); | |
dbf6c367 | 5957 | |
5958 | format_num = TREE_INT_CST_LOW (format_num_expr); | |
5959 | ||
5960 | for (inner_args = TREE_OPERAND (param, 1), i = 1; | |
5961 | inner_args != 0; | |
5962 | inner_args = TREE_CHAIN (inner_args), i++) | |
5963 | if (i == format_num) | |
5964 | { | |
5965 | check_function_arguments_recurse (callback, ctx, | |
5966 | TREE_VALUE (inner_args), | |
5967 | param_num); | |
5968 | found_format_arg = true; | |
5969 | break; | |
5970 | } | |
5971 | } | |
5972 | ||
5973 | /* If we found a format_arg attribute and did a recursive check, | |
5974 | we are done with checking this argument. Otherwise, we continue | |
5975 | and this will be considered a non-literal. */ | |
5976 | if (found_format_arg) | |
5977 | return; | |
5978 | } | |
5979 | ||
5980 | if (TREE_CODE (param) == COND_EXPR) | |
5981 | { | |
5982 | /* Check both halves of the conditional expression. */ | |
5983 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 5984 | TREE_OPERAND (param, 1), param_num); |
dbf6c367 | 5985 | check_function_arguments_recurse (callback, ctx, |
4ee9c684 | 5986 | TREE_OPERAND (param, 2), param_num); |
dbf6c367 | 5987 | return; |
5988 | } | |
5989 | ||
5990 | (*callback) (ctx, param, param_num); | |
5991 | } | |
1f3233d1 | 5992 | |
860251be | 5993 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
5994 | ||
5995 | int | |
5996 | field_decl_cmp (const void *x_p, const void *y_p) | |
5997 | { | |
4fd61bc6 | 5998 | const tree *const x = (const tree *const) x_p; |
5999 | const tree *const y = (const tree *const) y_p; | |
6000 | ||
860251be | 6001 | if (DECL_NAME (*x) == DECL_NAME (*y)) |
6002 | /* A nontype is "greater" than a type. */ | |
6003 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
6004 | if (DECL_NAME (*x) == NULL_TREE) | |
6005 | return -1; | |
6006 | if (DECL_NAME (*y) == NULL_TREE) | |
6007 | return 1; | |
6008 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
6009 | return -1; | |
6010 | return 1; | |
6011 | } | |
6012 | ||
6013 | static struct { | |
6014 | gt_pointer_operator new_value; | |
6015 | void *cookie; | |
6016 | } resort_data; | |
6017 | ||
6018 | /* This routine compares two fields like field_decl_cmp but using the | |
6019 | pointer operator in resort_data. */ | |
6020 | ||
6021 | static int | |
6022 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
6023 | { | |
4fd61bc6 | 6024 | const tree *const x = (const tree *const) x_p; |
6025 | const tree *const y = (const tree *const) y_p; | |
860251be | 6026 | |
6027 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
6028 | /* A nontype is "greater" than a type. */ | |
6029 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
6030 | if (DECL_NAME (*x) == NULL_TREE) | |
6031 | return -1; | |
6032 | if (DECL_NAME (*y) == NULL_TREE) | |
6033 | return 1; | |
6034 | { | |
6035 | tree d1 = DECL_NAME (*x); | |
6036 | tree d2 = DECL_NAME (*y); | |
6037 | resort_data.new_value (&d1, resort_data.cookie); | |
6038 | resort_data.new_value (&d2, resort_data.cookie); | |
6039 | if (d1 < d2) | |
6040 | return -1; | |
6041 | } | |
6042 | return 1; | |
6043 | } | |
6044 | ||
6045 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
6046 | ||
6047 | void | |
6048 | resort_sorted_fields (void *obj, | |
9a03a746 | 6049 | void * ARG_UNUSED (orig_obj), |
4ee9c684 | 6050 | gt_pointer_operator new_value, |
6051 | void *cookie) | |
860251be | 6052 | { |
9a03a746 | 6053 | struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; |
860251be | 6054 | resort_data.new_value = new_value; |
6055 | resort_data.cookie = cookie; | |
6056 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
4ee9c684 | 6057 | resort_field_decl_cmp); |
860251be | 6058 | } |
6059 | ||
209c9752 | 6060 | /* Subroutine of c_parse_error. |
6061 | Return the result of concatenating LHS and RHS. RHS is really | |
6062 | a string literal, its first character is indicated by RHS_START and | |
cfee01e3 | 6063 | RHS_SIZE is its length (including the terminating NUL character). |
209c9752 | 6064 | |
6065 | The caller is responsible for deleting the returned pointer. */ | |
6066 | ||
6067 | static char * | |
6068 | catenate_strings (const char *lhs, const char *rhs_start, int rhs_size) | |
6069 | { | |
6070 | const int lhs_size = strlen (lhs); | |
6071 | char *result = XNEWVEC (char, lhs_size + rhs_size); | |
6072 | strncpy (result, lhs, lhs_size); | |
6073 | strncpy (result + lhs_size, rhs_start, rhs_size); | |
6074 | return result; | |
6075 | } | |
6076 | ||
380c6697 | 6077 | /* Issue the error given by GMSGID, indicating that it occurred before |
92b128ed | 6078 | TOKEN, which had the associated VALUE. */ |
6079 | ||
6080 | void | |
380c6697 | 6081 | c_parse_error (const char *gmsgid, enum cpp_ttype token, tree value) |
92b128ed | 6082 | { |
209c9752 | 6083 | #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2)) |
6084 | ||
6085 | char *message = NULL; | |
92b128ed | 6086 | |
6087 | if (token == CPP_EOF) | |
380c6697 | 6088 | message = catenate_messages (gmsgid, " at end of input"); |
92b128ed | 6089 | else if (token == CPP_CHAR || token == CPP_WCHAR) |
6090 | { | |
6091 | unsigned int val = TREE_INT_CST_LOW (value); | |
6092 | const char *const ell = (token == CPP_CHAR) ? "" : "L"; | |
6093 | if (val <= UCHAR_MAX && ISGRAPH (val)) | |
a0c938f0 | 6094 | message = catenate_messages (gmsgid, " before %s'%c'"); |
92b128ed | 6095 | else |
a0c938f0 | 6096 | message = catenate_messages (gmsgid, " before %s'\\x%x'"); |
209c9752 | 6097 | |
6098 | error (message, ell, val); | |
6099 | free (message); | |
6100 | message = NULL; | |
92b128ed | 6101 | } |
209c9752 | 6102 | else if (token == CPP_STRING || token == CPP_WSTRING) |
380c6697 | 6103 | message = catenate_messages (gmsgid, " before string constant"); |
92b128ed | 6104 | else if (token == CPP_NUMBER) |
380c6697 | 6105 | message = catenate_messages (gmsgid, " before numeric constant"); |
92b128ed | 6106 | else if (token == CPP_NAME) |
209c9752 | 6107 | { |
380c6697 | 6108 | message = catenate_messages (gmsgid, " before %qE"); |
782858b8 | 6109 | error (message, value); |
209c9752 | 6110 | free (message); |
6111 | message = NULL; | |
6112 | } | |
b75b98aa | 6113 | else if (token == CPP_PRAGMA) |
6114 | message = catenate_messages (gmsgid, " before %<#pragma%>"); | |
6115 | else if (token == CPP_PRAGMA_EOL) | |
6116 | message = catenate_messages (gmsgid, " before end of line"); | |
92b128ed | 6117 | else if (token < N_TTYPES) |
209c9752 | 6118 | { |
380c6697 | 6119 | message = catenate_messages (gmsgid, " before %qs token"); |
209c9752 | 6120 | error (message, cpp_type2name (token)); |
6121 | free (message); | |
6122 | message = NULL; | |
6123 | } | |
92b128ed | 6124 | else |
380c6697 | 6125 | error (gmsgid); |
209c9752 | 6126 | |
6127 | if (message) | |
6128 | { | |
6129 | error (message); | |
6130 | free (message); | |
6131 | } | |
a0c938f0 | 6132 | #undef catenate_messages |
92b128ed | 6133 | } |
6134 | ||
4ee9c684 | 6135 | /* Walk a gimplified function and warn for functions whose return value is |
6136 | ignored and attribute((warn_unused_result)) is set. This is done before | |
b27ac6b5 | 6137 | inlining, so we don't have to worry about that. */ |
6138 | ||
4ee9c684 | 6139 | void |
6140 | c_warn_unused_result (tree *top_p) | |
6141 | { | |
6142 | tree t = *top_p; | |
6143 | tree_stmt_iterator i; | |
6144 | tree fdecl, ftype; | |
6145 | ||
6146 | switch (TREE_CODE (t)) | |
6147 | { | |
6148 | case STATEMENT_LIST: | |
6149 | for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i)) | |
6150 | c_warn_unused_result (tsi_stmt_ptr (i)); | |
6151 | break; | |
6152 | ||
6153 | case COND_EXPR: | |
6154 | c_warn_unused_result (&COND_EXPR_THEN (t)); | |
6155 | c_warn_unused_result (&COND_EXPR_ELSE (t)); | |
6156 | break; | |
6157 | case BIND_EXPR: | |
6158 | c_warn_unused_result (&BIND_EXPR_BODY (t)); | |
6159 | break; | |
6160 | case TRY_FINALLY_EXPR: | |
6161 | case TRY_CATCH_EXPR: | |
6162 | c_warn_unused_result (&TREE_OPERAND (t, 0)); | |
6163 | c_warn_unused_result (&TREE_OPERAND (t, 1)); | |
6164 | break; | |
6165 | case CATCH_EXPR: | |
6166 | c_warn_unused_result (&CATCH_BODY (t)); | |
6167 | break; | |
6168 | case EH_FILTER_EXPR: | |
6169 | c_warn_unused_result (&EH_FILTER_FAILURE (t)); | |
6170 | break; | |
6171 | ||
6172 | case CALL_EXPR: | |
0e364d12 | 6173 | if (TREE_USED (t)) |
6174 | break; | |
6175 | ||
4ee9c684 | 6176 | /* This is a naked call, as opposed to a CALL_EXPR nested inside |
6177 | a MODIFY_EXPR. All calls whose value is ignored should be | |
6178 | represented like this. Look for the attribute. */ | |
6179 | fdecl = get_callee_fndecl (t); | |
6180 | if (fdecl) | |
6181 | ftype = TREE_TYPE (fdecl); | |
6182 | else | |
6183 | { | |
6184 | ftype = TREE_TYPE (TREE_OPERAND (t, 0)); | |
6185 | /* Look past pointer-to-function to the function type itself. */ | |
6186 | ftype = TREE_TYPE (ftype); | |
6187 | } | |
6188 | ||
6189 | if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype))) | |
6190 | { | |
6191 | if (fdecl) | |
c3ceba8e | 6192 | warning (0, "%Hignoring return value of %qD, " |
4ee9c684 | 6193 | "declared with attribute warn_unused_result", |
6194 | EXPR_LOCUS (t), fdecl); | |
6195 | else | |
c3ceba8e | 6196 | warning (0, "%Hignoring return value of function " |
4ee9c684 | 6197 | "declared with attribute warn_unused_result", |
6198 | EXPR_LOCUS (t)); | |
6199 | } | |
6200 | break; | |
6201 | ||
6202 | default: | |
6203 | /* Not a container, not a call, or a call whose value is used. */ | |
6204 | break; | |
6205 | } | |
6206 | } | |
6207 | ||
624d37a6 | 6208 | /* Convert a character from the host to the target execution character |
6209 | set. cpplib handles this, mostly. */ | |
6210 | ||
6211 | HOST_WIDE_INT | |
6212 | c_common_to_target_charset (HOST_WIDE_INT c) | |
6213 | { | |
6214 | /* Character constants in GCC proper are sign-extended under -fsigned-char, | |
6215 | zero-extended under -fno-signed-char. cpplib insists that characters | |
6216 | and character constants are always unsigned. Hence we must convert | |
6217 | back and forth. */ | |
6218 | cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1); | |
6219 | ||
6220 | uc = cpp_host_to_exec_charset (parse_in, uc); | |
6221 | ||
6222 | if (flag_signed_char) | |
6223 | return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE) | |
6224 | >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE); | |
6225 | else | |
6226 | return uc; | |
6227 | } | |
6228 | ||
af28855b | 6229 | /* Build the result of __builtin_offsetof. EXPR is a nested sequence of |
d897f7c2 | 6230 | component references, with STOP_REF, or alternatively an INDIRECT_REF of |
6231 | NULL, at the bottom; much like the traditional rendering of offsetof as a | |
6232 | macro. Returns the folded and properly cast result. */ | |
af28855b | 6233 | |
6234 | static tree | |
d897f7c2 | 6235 | fold_offsetof_1 (tree expr, tree stop_ref) |
af28855b | 6236 | { |
6237 | enum tree_code code = PLUS_EXPR; | |
6238 | tree base, off, t; | |
6239 | ||
d897f7c2 | 6240 | if (expr == stop_ref && TREE_CODE (expr) != ERROR_MARK) |
6241 | return size_zero_node; | |
6242 | ||
af28855b | 6243 | switch (TREE_CODE (expr)) |
6244 | { | |
6245 | case ERROR_MARK: | |
6246 | return expr; | |
6247 | ||
6b11d2e3 | 6248 | case VAR_DECL: |
6249 | error ("cannot apply %<offsetof%> to static data member %qD", expr); | |
6250 | return error_mark_node; | |
6251 | ||
d897f7c2 | 6252 | case CALL_EXPR: |
6253 | error ("cannot apply %<offsetof%> when %<operator[]%> is overloaded"); | |
6254 | return error_mark_node; | |
6255 | ||
6256 | case INTEGER_CST: | |
6257 | gcc_assert (integer_zerop (expr)); | |
af28855b | 6258 | return size_zero_node; |
6259 | ||
d897f7c2 | 6260 | case NOP_EXPR: |
6261 | case INDIRECT_REF: | |
6262 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); | |
6263 | gcc_assert (base == error_mark_node || base == size_zero_node); | |
6264 | return base; | |
6265 | ||
af28855b | 6266 | case COMPONENT_REF: |
d897f7c2 | 6267 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); |
af28855b | 6268 | if (base == error_mark_node) |
6269 | return base; | |
6270 | ||
6271 | t = TREE_OPERAND (expr, 1); | |
6272 | if (DECL_C_BIT_FIELD (t)) | |
6273 | { | |
6274 | error ("attempt to take address of bit-field structure " | |
782858b8 | 6275 | "member %qD", t); |
af28855b | 6276 | return error_mark_node; |
6277 | } | |
6278 | off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t), | |
6279 | size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1) | |
6280 | / BITS_PER_UNIT)); | |
6281 | break; | |
6282 | ||
6283 | case ARRAY_REF: | |
d897f7c2 | 6284 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); |
af28855b | 6285 | if (base == error_mark_node) |
6286 | return base; | |
6287 | ||
6288 | t = TREE_OPERAND (expr, 1); | |
6289 | if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0) | |
6290 | { | |
6291 | code = MINUS_EXPR; | |
49d00087 | 6292 | t = fold_build1 (NEGATE_EXPR, TREE_TYPE (t), t); |
af28855b | 6293 | } |
6294 | t = convert (sizetype, t); | |
6295 | off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t); | |
6296 | break; | |
6297 | ||
6298 | default: | |
231bd014 | 6299 | gcc_unreachable (); |
af28855b | 6300 | } |
6301 | ||
6302 | return size_binop (code, base, off); | |
6303 | } | |
6304 | ||
6305 | tree | |
d897f7c2 | 6306 | fold_offsetof (tree expr, tree stop_ref) |
af28855b | 6307 | { |
6308 | /* Convert back from the internal sizetype to size_t. */ | |
d897f7c2 | 6309 | return convert (size_type_node, fold_offsetof_1 (expr, stop_ref)); |
af28855b | 6310 | } |
6311 | ||
e35976b1 | 6312 | /* Print an error message for an invalid lvalue. USE says |
ab6bb714 | 6313 | how the lvalue is being used and so selects the error message. */ |
6314 | ||
e35976b1 | 6315 | void |
6316 | lvalue_error (enum lvalue_use use) | |
ab6bb714 | 6317 | { |
e35976b1 | 6318 | switch (use) |
ab6bb714 | 6319 | { |
e35976b1 | 6320 | case lv_assign: |
82d76a54 | 6321 | error ("lvalue required as left operand of assignment"); |
e35976b1 | 6322 | break; |
6323 | case lv_increment: | |
82d76a54 | 6324 | error ("lvalue required as increment operand"); |
e35976b1 | 6325 | break; |
6326 | case lv_decrement: | |
82d76a54 | 6327 | error ("lvalue required as decrement operand"); |
e35976b1 | 6328 | break; |
6329 | case lv_addressof: | |
82d76a54 | 6330 | error ("lvalue required as unary %<&%> operand"); |
e35976b1 | 6331 | break; |
6332 | case lv_asm: | |
82d76a54 | 6333 | error ("lvalue required in asm statement"); |
e35976b1 | 6334 | break; |
6335 | default: | |
6336 | gcc_unreachable (); | |
ab6bb714 | 6337 | } |
ab6bb714 | 6338 | } |
c271bdb2 | 6339 | \f |
6340 | /* *PTYPE is an incomplete array. Complete it with a domain based on | |
6341 | INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT | |
6342 | is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, | |
6343 | 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */ | |
6344 | ||
6345 | int | |
6346 | complete_array_type (tree *ptype, tree initial_value, bool do_default) | |
6347 | { | |
6348 | tree maxindex, type, main_type, elt, unqual_elt; | |
6349 | int failure = 0, quals; | |
6753bca0 | 6350 | hashval_t hashcode = 0; |
c271bdb2 | 6351 | |
6352 | maxindex = size_zero_node; | |
6353 | if (initial_value) | |
6354 | { | |
6355 | if (TREE_CODE (initial_value) == STRING_CST) | |
6356 | { | |
6357 | int eltsize | |
6358 | = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
6359 | maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1); | |
6360 | } | |
6361 | else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
6362 | { | |
c75b4594 | 6363 | VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value); |
c271bdb2 | 6364 | |
c75b4594 | 6365 | if (VEC_empty (constructor_elt, v)) |
c271bdb2 | 6366 | { |
6367 | if (pedantic) | |
6368 | failure = 3; | |
6369 | maxindex = integer_minus_one_node; | |
6370 | } | |
6371 | else | |
6372 | { | |
6373 | tree curindex; | |
c75b4594 | 6374 | unsigned HOST_WIDE_INT cnt; |
6375 | constructor_elt *ce; | |
c271bdb2 | 6376 | |
c75b4594 | 6377 | if (VEC_index (constructor_elt, v, 0)->index) |
6378 | maxindex = fold_convert (sizetype, | |
6379 | VEC_index (constructor_elt, | |
6380 | v, 0)->index); | |
c271bdb2 | 6381 | curindex = maxindex; |
6382 | ||
c75b4594 | 6383 | for (cnt = 1; |
6384 | VEC_iterate (constructor_elt, v, cnt, ce); | |
6385 | cnt++) | |
c271bdb2 | 6386 | { |
c75b4594 | 6387 | if (ce->index) |
6388 | curindex = fold_convert (sizetype, ce->index); | |
c271bdb2 | 6389 | else |
6390 | curindex = size_binop (PLUS_EXPR, curindex, size_one_node); | |
6391 | ||
6392 | if (tree_int_cst_lt (maxindex, curindex)) | |
6393 | maxindex = curindex; | |
6394 | } | |
6395 | } | |
6396 | } | |
6397 | else | |
6398 | { | |
6399 | /* Make an error message unless that happened already. */ | |
6400 | if (initial_value != error_mark_node) | |
6401 | failure = 1; | |
6402 | } | |
6403 | } | |
6404 | else | |
6405 | { | |
6406 | failure = 2; | |
6407 | if (!do_default) | |
6408 | return failure; | |
6409 | } | |
6410 | ||
6411 | type = *ptype; | |
6412 | elt = TREE_TYPE (type); | |
6413 | quals = TYPE_QUALS (strip_array_types (elt)); | |
6414 | if (quals == 0) | |
6415 | unqual_elt = elt; | |
6416 | else | |
6417 | unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED); | |
6418 | ||
6419 | /* Using build_distinct_type_copy and modifying things afterward instead | |
6420 | of using build_array_type to create a new type preserves all of the | |
6421 | TYPE_LANG_FLAG_? bits that the front end may have set. */ | |
6422 | main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
6423 | TREE_TYPE (main_type) = unqual_elt; | |
6424 | TYPE_DOMAIN (main_type) = build_index_type (maxindex); | |
6425 | layout_type (main_type); | |
6426 | ||
6753bca0 | 6427 | /* Make sure we have the canonical MAIN_TYPE. */ |
6428 | hashcode = iterative_hash_object (TYPE_HASH (unqual_elt), hashcode); | |
6429 | hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (main_type)), | |
6430 | hashcode); | |
6431 | main_type = type_hash_canon (hashcode, main_type); | |
6432 | ||
c271bdb2 | 6433 | if (quals == 0) |
6434 | type = main_type; | |
6435 | else | |
6436 | type = c_build_qualified_type (main_type, quals); | |
6437 | ||
6438 | *ptype = type; | |
6439 | return failure; | |
6440 | } | |
ab6bb714 | 6441 | |
b6a5fc45 | 6442 | \f |
6443 | /* Used to help initialize the builtin-types.def table. When a type of | |
6444 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
6445 | The later results in segfaults even when a decl using the type doesn't | |
6446 | get invoked. */ | |
6447 | ||
6448 | tree | |
6449 | builtin_type_for_size (int size, bool unsignedp) | |
6450 | { | |
6451 | tree type = lang_hooks.types.type_for_size (size, unsignedp); | |
6452 | return type ? type : error_mark_node; | |
6453 | } | |
6454 | ||
6455 | /* A helper function for resolve_overloaded_builtin in resolving the | |
6456 | overloaded __sync_ builtins. Returns a positive power of 2 if the | |
6457 | first operand of PARAMS is a pointer to a supported data type. | |
6458 | Returns 0 if an error is encountered. */ | |
6459 | ||
6460 | static int | |
6461 | sync_resolve_size (tree function, tree params) | |
6462 | { | |
6463 | tree type; | |
6464 | int size; | |
6465 | ||
6466 | if (params == NULL) | |
6467 | { | |
6468 | error ("too few arguments to function %qE", function); | |
6469 | return 0; | |
6470 | } | |
6471 | ||
6472 | type = TREE_TYPE (TREE_VALUE (params)); | |
6473 | if (TREE_CODE (type) != POINTER_TYPE) | |
6474 | goto incompatible; | |
6475 | ||
6476 | type = TREE_TYPE (type); | |
6477 | if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type)) | |
6478 | goto incompatible; | |
6479 | ||
6480 | size = tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
27213ba3 | 6481 | if (size == 1 || size == 2 || size == 4 || size == 8 || size == 16) |
b6a5fc45 | 6482 | return size; |
6483 | ||
6484 | incompatible: | |
6485 | error ("incompatible type for argument %d of %qE", 1, function); | |
6486 | return 0; | |
6487 | } | |
6488 | ||
a0c938f0 | 6489 | /* A helper function for resolve_overloaded_builtin. Adds casts to |
b6a5fc45 | 6490 | PARAMS to make arguments match up with those of FUNCTION. Drops |
6491 | the variadic arguments at the end. Returns false if some error | |
6492 | was encountered; true on success. */ | |
6493 | ||
6494 | static bool | |
6495 | sync_resolve_params (tree orig_function, tree function, tree params) | |
6496 | { | |
6497 | tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function)); | |
6498 | tree ptype; | |
6499 | int number; | |
6500 | ||
6501 | /* We've declared the implementation functions to use "volatile void *" | |
6502 | as the pointer parameter, so we shouldn't get any complaints from the | |
6503 | call to check_function_arguments what ever type the user used. */ | |
6504 | arg_types = TREE_CHAIN (arg_types); | |
6505 | ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
6506 | number = 2; | |
6507 | ||
6508 | /* For the rest of the values, we need to cast these to FTYPE, so that we | |
6509 | don't get warnings for passing pointer types, etc. */ | |
6510 | while (arg_types != void_list_node) | |
6511 | { | |
6512 | tree val; | |
6513 | ||
6514 | params = TREE_CHAIN (params); | |
6515 | if (params == NULL) | |
6516 | { | |
6517 | error ("too few arguments to function %qE", orig_function); | |
6518 | return false; | |
6519 | } | |
6520 | ||
6521 | /* ??? Ideally for the first conversion we'd use convert_for_assignment | |
6522 | so that we get warnings for anything that doesn't match the pointer | |
6523 | type. This isn't portable across the C and C++ front ends atm. */ | |
6524 | val = TREE_VALUE (params); | |
6525 | val = convert (ptype, val); | |
6526 | val = convert (TREE_VALUE (arg_types), val); | |
6527 | TREE_VALUE (params) = val; | |
6528 | ||
6529 | arg_types = TREE_CHAIN (arg_types); | |
6530 | number++; | |
6531 | } | |
6532 | ||
6533 | /* The definition of these primitives is variadic, with the remaining | |
6534 | being "an optional list of variables protected by the memory barrier". | |
6535 | No clue what that's supposed to mean, precisely, but we consider all | |
6536 | call-clobbered variables to be protected so we're safe. */ | |
6537 | TREE_CHAIN (params) = NULL; | |
6538 | ||
6539 | return true; | |
6540 | } | |
6541 | ||
a0c938f0 | 6542 | /* A helper function for resolve_overloaded_builtin. Adds a cast to |
b6a5fc45 | 6543 | RESULT to make it match the type of the first pointer argument in |
6544 | PARAMS. */ | |
6545 | ||
6546 | static tree | |
6547 | sync_resolve_return (tree params, tree result) | |
6548 | { | |
6549 | tree ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
10080eac | 6550 | ptype = TYPE_MAIN_VARIANT (ptype); |
b6a5fc45 | 6551 | return convert (ptype, result); |
6552 | } | |
6553 | ||
6554 | /* Some builtin functions are placeholders for other expressions. This | |
6555 | function should be called immediately after parsing the call expression | |
6556 | before surrounding code has committed to the type of the expression. | |
6557 | ||
6558 | FUNCTION is the DECL that has been invoked; it is known to be a builtin. | |
6559 | PARAMS is the argument list for the call. The return value is non-null | |
6560 | when expansion is complete, and null if normal processing should | |
6561 | continue. */ | |
6562 | ||
6563 | tree | |
6564 | resolve_overloaded_builtin (tree function, tree params) | |
6565 | { | |
6566 | enum built_in_function orig_code = DECL_FUNCTION_CODE (function); | |
65441f6f | 6567 | switch (DECL_BUILT_IN_CLASS (function)) |
6568 | { | |
6569 | case BUILT_IN_NORMAL: | |
6570 | break; | |
6571 | case BUILT_IN_MD: | |
6572 | if (targetm.resolve_overloaded_builtin) | |
a0c938f0 | 6573 | return targetm.resolve_overloaded_builtin (function, params); |
65441f6f | 6574 | else |
a0c938f0 | 6575 | return NULL_TREE; |
65441f6f | 6576 | default: |
6577 | return NULL_TREE; | |
6578 | } | |
a0c938f0 | 6579 | |
65441f6f | 6580 | /* Handle BUILT_IN_NORMAL here. */ |
b6a5fc45 | 6581 | switch (orig_code) |
6582 | { | |
6583 | case BUILT_IN_FETCH_AND_ADD_N: | |
6584 | case BUILT_IN_FETCH_AND_SUB_N: | |
6585 | case BUILT_IN_FETCH_AND_OR_N: | |
6586 | case BUILT_IN_FETCH_AND_AND_N: | |
6587 | case BUILT_IN_FETCH_AND_XOR_N: | |
6588 | case BUILT_IN_FETCH_AND_NAND_N: | |
6589 | case BUILT_IN_ADD_AND_FETCH_N: | |
6590 | case BUILT_IN_SUB_AND_FETCH_N: | |
6591 | case BUILT_IN_OR_AND_FETCH_N: | |
6592 | case BUILT_IN_AND_AND_FETCH_N: | |
6593 | case BUILT_IN_XOR_AND_FETCH_N: | |
6594 | case BUILT_IN_NAND_AND_FETCH_N: | |
6595 | case BUILT_IN_BOOL_COMPARE_AND_SWAP_N: | |
6596 | case BUILT_IN_VAL_COMPARE_AND_SWAP_N: | |
6597 | case BUILT_IN_LOCK_TEST_AND_SET_N: | |
6598 | case BUILT_IN_LOCK_RELEASE_N: | |
6599 | { | |
6600 | int n = sync_resolve_size (function, params); | |
6601 | tree new_function, result; | |
6602 | ||
6603 | if (n == 0) | |
6604 | return error_mark_node; | |
6605 | ||
6606 | new_function = built_in_decls[orig_code + exact_log2 (n) + 1]; | |
6607 | if (!sync_resolve_params (function, new_function, params)) | |
6608 | return error_mark_node; | |
6609 | ||
6610 | result = build_function_call (new_function, params); | |
6611 | if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N | |
6612 | && orig_code != BUILT_IN_LOCK_RELEASE_N) | |
6613 | result = sync_resolve_return (params, result); | |
6614 | ||
6615 | return result; | |
6616 | } | |
6617 | ||
6618 | default: | |
65441f6f | 6619 | return NULL_TREE; |
b6a5fc45 | 6620 | } |
6621 | } | |
6622 | ||
491255f5 | 6623 | /* Ignoring their sign, return true if two scalar types are the same. */ |
6624 | bool | |
6625 | same_scalar_type_ignoring_signedness (tree t1, tree t2) | |
6626 | { | |
6627 | enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2); | |
6628 | ||
6629 | gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE) | |
6630 | && (c2 == INTEGER_TYPE || c2 == REAL_TYPE)); | |
6631 | ||
6632 | /* Equality works here because c_common_signed_type uses | |
6633 | TYPE_MAIN_VARIANT. */ | |
6634 | return lang_hooks.types.signed_type (t1) | |
6635 | == lang_hooks.types.signed_type (t2); | |
6636 | } | |
6637 | ||
be7350e7 | 6638 | /* Check for missing format attributes on function pointers. LTYPE is |
6639 | the new type or left-hand side type. RTYPE is the old type or | |
6640 | right-hand side type. Returns TRUE if LTYPE is missing the desired | |
6641 | attribute. */ | |
6642 | ||
6643 | bool | |
6644 | check_missing_format_attribute (tree ltype, tree rtype) | |
6645 | { | |
6646 | tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype); | |
6647 | tree ra; | |
6648 | ||
6649 | for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra)) | |
6650 | if (is_attribute_p ("format", TREE_PURPOSE (ra))) | |
6651 | break; | |
6652 | if (ra) | |
6653 | { | |
6654 | tree la; | |
6655 | for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la)) | |
6656 | if (is_attribute_p ("format", TREE_PURPOSE (la))) | |
6657 | break; | |
6658 | return !la; | |
6659 | } | |
6660 | else | |
6661 | return false; | |
6662 | } | |
6663 | ||
2840aae4 | 6664 | /* Subscripting with type char is likely to lose on a machine where |
6665 | chars are signed. So warn on any machine, but optionally. Don't | |
6666 | warn for unsigned char since that type is safe. Don't warn for | |
6667 | signed char because anyone who uses that must have done so | |
6668 | deliberately. Furthermore, we reduce the false positive load by | |
6669 | warning only for non-constant value of type char. */ | |
6670 | ||
6671 | void | |
6672 | warn_array_subscript_with_type_char (tree index) | |
6673 | { | |
6674 | if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node | |
6675 | && TREE_CODE (index) != INTEGER_CST) | |
6676 | warning (OPT_Wchar_subscripts, "array subscript has type %<char%>"); | |
6677 | } | |
6678 | ||
e534436e | 6679 | /* Implement -Wparentheses for the unexpected C precedence rules, to |
6680 | cover cases like x + y << z which readers are likely to | |
6681 | misinterpret. We have seen an expression in which CODE is a binary | |
6682 | operator used to combine expressions headed by CODE_LEFT and | |
6683 | CODE_RIGHT. CODE_LEFT and CODE_RIGHT may be ERROR_MARK, which | |
6684 | means that that side of the expression was not formed using a | |
6685 | binary operator, or it was enclosed in parentheses. */ | |
6686 | ||
6687 | void | |
6688 | warn_about_parentheses (enum tree_code code, enum tree_code code_left, | |
6689 | enum tree_code code_right) | |
6690 | { | |
6691 | if (!warn_parentheses) | |
6692 | return; | |
6693 | ||
6694 | if (code == LSHIFT_EXPR || code == RSHIFT_EXPR) | |
6695 | { | |
6696 | if (code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
6697 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
6698 | warning (OPT_Wparentheses, | |
6699 | "suggest parentheses around + or - inside shift"); | |
6700 | } | |
6701 | ||
6702 | if (code == TRUTH_ORIF_EXPR) | |
6703 | { | |
6704 | if (code_left == TRUTH_ANDIF_EXPR | |
6705 | || code_right == TRUTH_ANDIF_EXPR) | |
6706 | warning (OPT_Wparentheses, | |
6707 | "suggest parentheses around && within ||"); | |
6708 | } | |
6709 | ||
6710 | if (code == BIT_IOR_EXPR) | |
6711 | { | |
6712 | if (code_left == BIT_AND_EXPR || code_left == BIT_XOR_EXPR | |
6713 | || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
6714 | || code_right == BIT_AND_EXPR || code_right == BIT_XOR_EXPR | |
6715 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
6716 | warning (OPT_Wparentheses, | |
6717 | "suggest parentheses around arithmetic in operand of |"); | |
6718 | /* Check cases like x|y==z */ | |
6719 | if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
6720 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
6721 | warning (OPT_Wparentheses, | |
6722 | "suggest parentheses around comparison in operand of |"); | |
6723 | } | |
6724 | ||
6725 | if (code == BIT_XOR_EXPR) | |
6726 | { | |
6727 | if (code_left == BIT_AND_EXPR | |
6728 | || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
6729 | || code_right == BIT_AND_EXPR | |
6730 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
6731 | warning (OPT_Wparentheses, | |
6732 | "suggest parentheses around arithmetic in operand of ^"); | |
6733 | /* Check cases like x^y==z */ | |
6734 | if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
6735 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
6736 | warning (OPT_Wparentheses, | |
6737 | "suggest parentheses around comparison in operand of ^"); | |
6738 | } | |
6739 | ||
6740 | if (code == BIT_AND_EXPR) | |
6741 | { | |
6742 | if (code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
6743 | || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
6744 | warning (OPT_Wparentheses, | |
6745 | "suggest parentheses around + or - in operand of &"); | |
6746 | /* Check cases like x&y==z */ | |
6747 | if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
6748 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
6749 | warning (OPT_Wparentheses, | |
6750 | "suggest parentheses around comparison in operand of &"); | |
6751 | } | |
6752 | ||
6ce0c450 | 6753 | if (code == EQ_EXPR || code == NE_EXPR) |
6754 | { | |
6755 | if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
6756 | || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
6757 | warning (OPT_Wparentheses, | |
6758 | "suggest parentheses around comparison in operand of %s", | |
6759 | code == EQ_EXPR ? "==" : "!="); | |
6760 | } | |
6761 | else if (TREE_CODE_CLASS (code) == tcc_comparison) | |
6762 | { | |
6763 | if ((TREE_CODE_CLASS (code_left) == tcc_comparison | |
6764 | && code_left != NE_EXPR && code_left != EQ_EXPR) | |
6765 | || (TREE_CODE_CLASS (code_right) == tcc_comparison | |
6766 | && code_right != NE_EXPR && code_right != EQ_EXPR)) | |
6767 | warning (OPT_Wparentheses, "comparisons like X<=Y<=Z do not " | |
6768 | "have their mathematical meaning"); | |
6769 | } | |
e534436e | 6770 | } |
6771 | ||
92fccaaa | 6772 | /* If LABEL (a LABEL_DECL) has not been used, issue a warning. */ |
6773 | ||
6774 | void | |
6775 | warn_for_unused_label (tree label) | |
6776 | { | |
6777 | if (!TREE_USED (label)) | |
6778 | { | |
6779 | if (DECL_INITIAL (label)) | |
6780 | warning (OPT_Wunused_label, "label %q+D defined but not used", label); | |
6781 | else | |
6782 | warning (OPT_Wunused_label, "label %q+D declared but not defined", label); | |
6783 | } | |
6784 | } | |
2840aae4 | 6785 | |
1f3233d1 | 6786 | #include "gt-c-common.h" |