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Commit | Line | Data |
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b30f223b | 1 | /* Subroutines shared by all languages that are variants of C. |
1574ef13 | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
ad616de1 | 3 | 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
b30f223b | 4 | |
1322177d | 5 | This file is part of GCC. |
b30f223b | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
b30f223b | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
b30f223b RS |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d | 18 | along with GCC; see the file COPYING. If not, write to the Free |
366ccddb KC |
19 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
b30f223b RS |
21 | |
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
d9b2742a | 26 | #include "intl.h" |
b30f223b | 27 | #include "tree.h" |
b30f223b | 28 | #include "flags.h" |
d6f4ec51 | 29 | #include "output.h" |
e2af664c | 30 | #include "c-pragma.h" |
3932261a | 31 | #include "rtl.h" |
1526a060 | 32 | #include "ggc.h" |
17211ab5 | 33 | #include "varray.h" |
c6991660 | 34 | #include "expr.h" |
8f17b5c5 | 35 | #include "c-common.h" |
22703ccc | 36 | #include "diagnostic.h" |
7bdb32b9 | 37 | #include "tm_p.h" |
235cfbc4 | 38 | #include "obstack.h" |
c8724862 | 39 | #include "cpplib.h" |
12a68f1f | 40 | #include "target.h" |
7afff7cf | 41 | #include "langhooks.h" |
d57a4b98 | 42 | #include "tree-inline.h" |
0bfa5f65 | 43 | #include "c-tree.h" |
5f1989e6 | 44 | #include "toplev.h" |
6de9cd9a DN |
45 | #include "tree-iterator.h" |
46 | #include "hashtab.h" | |
c31b8e1b | 47 | #include "tree-mudflap.h" |
d974312d | 48 | #include "opts.h" |
010c4d9c | 49 | #include "real.h" |
ce91e74c | 50 | #include "cgraph.h" |
cb60f38d | 51 | |
81a75f0f | 52 | cpp_reader *parse_in; /* Declared in c-pragma.h. */ |
c8724862 | 53 | |
eaa7c03f JM |
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 | ||
d1c38823 ZD |
64 | #ifndef PID_TYPE |
65 | #define PID_TYPE "int" | |
66 | #endif | |
67 | ||
eaa7c03f JM |
68 | #ifndef WCHAR_TYPE |
69 | #define WCHAR_TYPE "int" | |
70 | #endif | |
71 | ||
a11eba95 ZW |
72 | /* WCHAR_TYPE gets overridden by -fshort-wchar. */ |
73 | #define MODIFIED_WCHAR_TYPE \ | |
74 | (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE) | |
75 | ||
0884b60c BS |
76 | #ifndef PTRDIFF_TYPE |
77 | #define PTRDIFF_TYPE "long int" | |
78 | #endif | |
79 | ||
5fd8e536 JM |
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 | ||
7f4edbcb | 100 | /* The following symbols are subsumed in the c_global_trees array, and |
d125d268 | 101 | listed here individually for documentation purposes. |
7f4edbcb BS |
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 | ||
de7df9eb JM |
113 | tree truthvalue_type_node; |
114 | tree truthvalue_false_node; | |
115 | tree truthvalue_true_node; | |
7f4edbcb BS |
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 | ||
134 | tree intQI_type_node; | |
135 | tree intHI_type_node; | |
136 | tree intSI_type_node; | |
137 | tree intDI_type_node; | |
138 | tree intTI_type_node; | |
139 | ||
140 | tree unsigned_intQI_type_node; | |
141 | tree unsigned_intHI_type_node; | |
142 | tree unsigned_intSI_type_node; | |
143 | tree unsigned_intDI_type_node; | |
144 | tree unsigned_intTI_type_node; | |
145 | ||
146 | tree widest_integer_literal_type_node; | |
147 | tree widest_unsigned_literal_type_node; | |
148 | ||
149 | Nodes for types `void *' and `const void *'. | |
150 | ||
151 | tree ptr_type_node, const_ptr_type_node; | |
152 | ||
153 | Nodes for types `char *' and `const char *'. | |
154 | ||
155 | tree string_type_node, const_string_type_node; | |
156 | ||
157 | Type `char[SOMENUMBER]'. | |
158 | Used when an array of char is needed and the size is irrelevant. | |
159 | ||
160 | tree char_array_type_node; | |
161 | ||
162 | Type `int[SOMENUMBER]' or something like it. | |
163 | Used when an array of int needed and the size is irrelevant. | |
164 | ||
165 | tree int_array_type_node; | |
166 | ||
167 | Type `wchar_t[SOMENUMBER]' or something like it. | |
168 | Used when a wide string literal is created. | |
169 | ||
170 | tree wchar_array_type_node; | |
171 | ||
172 | Type `int ()' -- used for implicit declaration of functions. | |
173 | ||
174 | tree default_function_type; | |
175 | ||
7f4edbcb BS |
176 | A VOID_TYPE node, packaged in a TREE_LIST. |
177 | ||
178 | tree void_list_node; | |
179 | ||
684d9f3b | 180 | The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, |
0ba8a114 NS |
181 | and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ |
182 | VAR_DECLS, but C++ does.) | |
63ad61ed | 183 | |
0ba8a114 | 184 | tree function_name_decl_node; |
684d9f3b | 185 | tree pretty_function_name_decl_node; |
0ba8a114 NS |
186 | tree c99_function_name_decl_node; |
187 | ||
188 | Stack of nested function name VAR_DECLs. | |
35b1a6fa | 189 | |
0ba8a114 | 190 | tree saved_function_name_decls; |
63ad61ed | 191 | |
7f4edbcb BS |
192 | */ |
193 | ||
194 | tree c_global_trees[CTI_MAX]; | |
17211ab5 | 195 | \f |
4078b403 NB |
196 | /* Switches common to the C front ends. */ |
197 | ||
aaf93206 | 198 | /* Nonzero if prepreprocessing only. */ |
63973df3 | 199 | |
aaf93206 NB |
200 | int flag_preprocess_only; |
201 | ||
63973df3 NB |
202 | /* Nonzero means don't output line number information. */ |
203 | ||
204 | char flag_no_line_commands; | |
205 | ||
206 | /* Nonzero causes -E output not to be done, but directives such as | |
207 | #define that have side effects are still obeyed. */ | |
208 | ||
209 | char flag_no_output; | |
210 | ||
211 | /* Nonzero means dump macros in some fashion. */ | |
212 | ||
213 | char flag_dump_macros; | |
214 | ||
215 | /* Nonzero means pass #include lines through to the output. */ | |
216 | ||
217 | char flag_dump_includes; | |
218 | ||
c0d578e6 GK |
219 | /* Nonzero means process PCH files while preprocessing. */ |
220 | ||
221 | bool flag_pch_preprocess; | |
222 | ||
17211ab5 GK |
223 | /* The file name to which we should write a precompiled header, or |
224 | NULL if no header will be written in this compile. */ | |
225 | ||
226 | const char *pch_file; | |
227 | ||
3df89291 NB |
228 | /* Nonzero if an ISO standard was selected. It rejects macros in the |
229 | user's namespace. */ | |
230 | int flag_iso; | |
231 | ||
232 | /* Nonzero if -undef was given. It suppresses target built-in macros | |
233 | and assertions. */ | |
234 | int flag_undef; | |
235 | ||
6bcedb4e MM |
236 | /* Nonzero means don't recognize the non-ANSI builtin functions. */ |
237 | ||
238 | int flag_no_builtin; | |
239 | ||
240 | /* Nonzero means don't recognize the non-ANSI builtin functions. | |
241 | -ansi sets this. */ | |
242 | ||
243 | int flag_no_nonansi_builtin; | |
244 | ||
eaa7c03f JM |
245 | /* Nonzero means give `double' the same size as `float'. */ |
246 | ||
247 | int flag_short_double; | |
248 | ||
249 | /* Nonzero means give `wchar_t' the same size as `short'. */ | |
250 | ||
251 | int flag_short_wchar; | |
252 | ||
750491fc RH |
253 | /* Nonzero means allow Microsoft extensions without warnings or errors. */ |
254 | int flag_ms_extensions; | |
255 | ||
4078b403 NB |
256 | /* Nonzero means don't recognize the keyword `asm'. */ |
257 | ||
258 | int flag_no_asm; | |
259 | ||
260 | /* Nonzero means give string constants the type `const char *', as mandated | |
261 | by the standard. */ | |
262 | ||
263 | int flag_const_strings; | |
264 | ||
4078b403 NB |
265 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
266 | ||
267 | int flag_signed_bitfields = 1; | |
4078b403 | 268 | |
4078b403 NB |
269 | /* Nonzero means warn about deprecated conversion from string constant to |
270 | `char *'. */ | |
271 | ||
272 | int warn_write_strings; | |
273 | ||
35b1a6fa | 274 | /* Warn about #pragma directives that are not recognized. */ |
4078b403 | 275 | |
35b1a6fa | 276 | int warn_unknown_pragmas; /* Tri state variable. */ |
4078b403 | 277 | |
4078b403 NB |
278 | /* Warn about format/argument anomalies in calls to formatted I/O functions |
279 | (*printf, *scanf, strftime, strfmon, etc.). */ | |
280 | ||
281 | int warn_format; | |
282 | ||
b2f97e4a MM |
283 | /* Warn about using __null (as NULL in C++) as sentinel. For code compiled |
284 | with GCC this doesn't matter as __null is guaranteed to have the right | |
285 | size. */ | |
286 | ||
287 | int warn_strict_null_sentinel; | |
288 | ||
264fa2db ZL |
289 | /* Zero means that faster, ...NonNil variants of objc_msgSend... |
290 | calls will be used in ObjC; passing nil receivers to such calls | |
291 | will most likely result in crashes. */ | |
292 | int flag_nil_receivers = 1; | |
293 | ||
264fa2db ZL |
294 | /* Nonzero means that code generation will be altered to support |
295 | "zero-link" execution. This currently affects ObjC only, but may | |
296 | affect other languages in the future. */ | |
297 | int flag_zero_link = 0; | |
298 | ||
299 | /* Nonzero means emit an '__OBJC, __image_info' for the current translation | |
300 | unit. It will inform the ObjC runtime that class definition(s) herein | |
301 | contained are to replace one(s) previously loaded. */ | |
302 | int flag_replace_objc_classes = 0; | |
9f63daea | 303 | |
4078b403 NB |
304 | /* C/ObjC language option variables. */ |
305 | ||
306 | ||
4078b403 NB |
307 | /* Nonzero means allow type mismatches in conditional expressions; |
308 | just make their values `void'. */ | |
309 | ||
310 | int flag_cond_mismatch; | |
311 | ||
312 | /* Nonzero means enable C89 Amendment 1 features. */ | |
313 | ||
314 | int flag_isoc94; | |
315 | ||
316 | /* Nonzero means use the ISO C99 dialect of C. */ | |
317 | ||
318 | int flag_isoc99; | |
319 | ||
6614fd40 | 320 | /* Nonzero means that we have builtin functions, and main is an int. */ |
4078b403 NB |
321 | |
322 | int flag_hosted = 1; | |
323 | ||
4078b403 NB |
324 | /* Warn if main is suspicious. */ |
325 | ||
326 | int warn_main; | |
327 | ||
4078b403 NB |
328 | |
329 | /* ObjC language option variables. */ | |
330 | ||
331 | ||
332 | /* Open and close the file for outputting class declarations, if | |
333 | requested (ObjC). */ | |
334 | ||
335 | int flag_gen_declaration; | |
336 | ||
4078b403 NB |
337 | /* Tells the compiler that this is a special run. Do not perform any |
338 | compiling, instead we are to test some platform dependent features | |
339 | and output a C header file with appropriate definitions. */ | |
340 | ||
341 | int print_struct_values; | |
342 | ||
2a694ec8 | 343 | /* Tells the compiler what is the constant string class for Objc. */ |
4078b403 NB |
344 | |
345 | const char *constant_string_class_name; | |
346 | ||
4078b403 NB |
347 | |
348 | /* C++ language option variables. */ | |
349 | ||
350 | ||
351 | /* Nonzero means don't recognize any extension keywords. */ | |
352 | ||
353 | int flag_no_gnu_keywords; | |
354 | ||
355 | /* Nonzero means do emit exported implementations of functions even if | |
356 | they can be inlined. */ | |
357 | ||
358 | int flag_implement_inlines = 1; | |
359 | ||
4078b403 NB |
360 | /* Nonzero means that implicit instantiations will be emitted if needed. */ |
361 | ||
362 | int flag_implicit_templates = 1; | |
363 | ||
364 | /* Nonzero means that implicit instantiations of inline templates will be | |
365 | emitted if needed, even if instantiations of non-inline templates | |
366 | aren't. */ | |
367 | ||
368 | int flag_implicit_inline_templates = 1; | |
369 | ||
370 | /* Nonzero means generate separate instantiation control files and | |
371 | juggle them at link time. */ | |
372 | ||
373 | int flag_use_repository; | |
374 | ||
375 | /* Nonzero if we want to issue diagnostics that the standard says are not | |
376 | required. */ | |
377 | ||
378 | int flag_optional_diags = 1; | |
379 | ||
380 | /* Nonzero means we should attempt to elide constructors when possible. */ | |
381 | ||
382 | int flag_elide_constructors = 1; | |
383 | ||
384 | /* Nonzero means that member functions defined in class scope are | |
385 | inline by default. */ | |
386 | ||
387 | int flag_default_inline = 1; | |
388 | ||
389 | /* Controls whether compiler generates 'type descriptor' that give | |
390 | run-time type information. */ | |
391 | ||
392 | int flag_rtti = 1; | |
393 | ||
394 | /* Nonzero if we want to conserve space in the .o files. We do this | |
395 | by putting uninitialized data and runtime initialized data into | |
396 | .common instead of .data at the expense of not flagging multiple | |
397 | definitions. */ | |
398 | ||
399 | int flag_conserve_space; | |
400 | ||
401 | /* Nonzero if we want to obey access control semantics. */ | |
402 | ||
403 | int flag_access_control = 1; | |
404 | ||
405 | /* Nonzero if we want to check the return value of new and avoid calling | |
406 | constructors if it is a null pointer. */ | |
407 | ||
408 | int flag_check_new; | |
409 | ||
410 | /* Nonzero if we want the new ISO rules for pushing a new scope for `for' | |
411 | initialization variables. | |
412 | 0: Old rules, set by -fno-for-scope. | |
413 | 2: New ISO rules, set by -ffor-scope. | |
414 | 1: Try to implement new ISO rules, but with backup compatibility | |
415 | (and warnings). This is the default, for now. */ | |
416 | ||
417 | int flag_new_for_scope = 1; | |
418 | ||
419 | /* Nonzero if we want to emit defined symbols with common-like linkage as | |
420 | weak symbols where possible, in order to conform to C++ semantics. | |
421 | Otherwise, emit them as local symbols. */ | |
422 | ||
423 | int flag_weak = 1; | |
424 | ||
b20d9f0c AO |
425 | /* 0 means we want the preprocessor to not emit line directives for |
426 | the current working directory. 1 means we want it to do it. -1 | |
427 | means we should decide depending on whether debugging information | |
428 | is being emitted or not. */ | |
429 | ||
430 | int flag_working_directory = -1; | |
431 | ||
4078b403 NB |
432 | /* Nonzero to use __cxa_atexit, rather than atexit, to register |
433 | destructors for local statics and global objects. */ | |
434 | ||
435 | int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT; | |
436 | ||
4078b403 NB |
437 | /* Nonzero means make the default pedwarns warnings instead of errors. |
438 | The value of this flag is ignored if -pedantic is specified. */ | |
439 | ||
440 | int flag_permissive; | |
441 | ||
442 | /* Nonzero means to implement standard semantics for exception | |
443 | specifications, calling unexpected if an exception is thrown that | |
444 | doesn't match the specification. Zero means to treat them as | |
445 | assertions and optimize accordingly, but not check them. */ | |
446 | ||
447 | int flag_enforce_eh_specs = 1; | |
448 | ||
40aac948 JM |
449 | /* Nonzero means to generate thread-safe code for initializing local |
450 | statics. */ | |
451 | ||
452 | int flag_threadsafe_statics = 1; | |
453 | ||
4078b403 NB |
454 | /* Nonzero means warn about implicit declarations. */ |
455 | ||
456 | int warn_implicit = 1; | |
457 | ||
4078b403 NB |
458 | /* Maximum template instantiation depth. This limit is rather |
459 | arbitrary, but it exists to limit the time it takes to notice | |
460 | infinite template instantiations. */ | |
461 | ||
462 | int max_tinst_depth = 500; | |
463 | ||
464 | ||
465 | ||
f09f1de5 MM |
466 | /* The elements of `ridpointers' are identifier nodes for the reserved |
467 | type names and storage classes. It is indexed by a RID_... value. */ | |
468 | tree *ridpointers; | |
469 | ||
35b1a6fa | 470 | tree (*make_fname_decl) (tree, int); |
2ce07e2d | 471 | |
e78a3b42 RK |
472 | /* Nonzero means the expression being parsed will never be evaluated. |
473 | This is a count, since unevaluated expressions can nest. */ | |
474 | int skip_evaluation; | |
475 | ||
ec5c56db | 476 | /* Information about how a function name is generated. */ |
0ba8a114 NS |
477 | struct fname_var_t |
478 | { | |
8b60264b KG |
479 | tree *const decl; /* pointer to the VAR_DECL. */ |
480 | const unsigned rid; /* RID number for the identifier. */ | |
481 | const int pretty; /* How pretty is it? */ | |
0ba8a114 NS |
482 | }; |
483 | ||
ec5c56db | 484 | /* The three ways of getting then name of the current function. */ |
0ba8a114 NS |
485 | |
486 | const struct fname_var_t fname_vars[] = | |
487 | { | |
ec5c56db | 488 | /* C99 compliant __func__, must be first. */ |
0ba8a114 | 489 | {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, |
ec5c56db | 490 | /* GCC __FUNCTION__ compliant. */ |
0ba8a114 | 491 | {&function_name_decl_node, RID_FUNCTION_NAME, 0}, |
ec5c56db | 492 | /* GCC __PRETTY_FUNCTION__ compliant. */ |
0ba8a114 NS |
493 | {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, |
494 | {NULL, 0, 0}, | |
495 | }; | |
496 | ||
35b1a6fa | 497 | static int constant_fits_type_p (tree, tree); |
a6c0a76c SB |
498 | static tree check_case_value (tree); |
499 | static bool check_case_bounds (tree, tree, tree *, tree *); | |
4724b3de | 500 | |
35b1a6fa AJ |
501 | static tree handle_packed_attribute (tree *, tree, tree, int, bool *); |
502 | static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
503 | static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
504 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
505 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); | |
506 | static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
507 | bool *); | |
0691d1d4 | 508 | static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); |
35b1a6fa AJ |
509 | static tree handle_used_attribute (tree *, tree, tree, int, bool *); |
510 | static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
ce91e74c JH |
511 | static tree handle_externally_visible_attribute (tree *, tree, tree, int, |
512 | bool *); | |
35b1a6fa AJ |
513 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); |
514 | static tree handle_transparent_union_attribute (tree *, tree, tree, | |
515 | int, bool *); | |
516 | static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
517 | static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
518 | static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
519 | static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
520 | static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
521 | static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
522 | static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
a0203ca7 | 523 | static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; |
35b1a6fa AJ |
524 | static tree handle_visibility_attribute (tree *, tree, tree, int, |
525 | bool *); | |
526 | static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
527 | bool *); | |
528 | static tree handle_no_instrument_function_attribute (tree *, tree, | |
529 | tree, int, bool *); | |
530 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
6e9a3221 | 531 | static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); |
35b1a6fa AJ |
532 | static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, |
533 | bool *); | |
534 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
dcd6de6d | 535 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); |
35b1a6fa AJ |
536 | static tree handle_deprecated_attribute (tree *, tree, tree, int, |
537 | bool *); | |
538 | static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
539 | bool *); | |
540 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
541 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
542 | static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
72954a4f JM |
543 | static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, |
544 | bool *); | |
3d091dac | 545 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); |
35b1a6fa AJ |
546 | |
547 | static void check_function_nonnull (tree, tree); | |
548 | static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); | |
549 | static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
550 | static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
d07605f5 | 551 | static int resort_field_decl_cmp (const void *, const void *); |
b34c7881 | 552 | |
349ae713 NB |
553 | /* Table of machine-independent attributes common to all C-like languages. */ |
554 | const struct attribute_spec c_common_attribute_table[] = | |
555 | { | |
556 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
557 | { "packed", 0, 0, false, false, false, | |
35b1a6fa | 558 | handle_packed_attribute }, |
349ae713 NB |
559 | { "nocommon", 0, 0, true, false, false, |
560 | handle_nocommon_attribute }, | |
561 | { "common", 0, 0, true, false, false, | |
562 | handle_common_attribute }, | |
563 | /* FIXME: logically, noreturn attributes should be listed as | |
564 | "false, true, true" and apply to function types. But implementing this | |
565 | would require all the places in the compiler that use TREE_THIS_VOLATILE | |
566 | on a decl to identify non-returning functions to be located and fixed | |
567 | to check the function type instead. */ | |
568 | { "noreturn", 0, 0, true, false, false, | |
569 | handle_noreturn_attribute }, | |
570 | { "volatile", 0, 0, true, false, false, | |
571 | handle_noreturn_attribute }, | |
572 | { "noinline", 0, 0, true, false, false, | |
573 | handle_noinline_attribute }, | |
574 | { "always_inline", 0, 0, true, false, false, | |
575 | handle_always_inline_attribute }, | |
0691d1d4 RG |
576 | { "flatten", 0, 0, true, false, false, |
577 | handle_flatten_attribute }, | |
349ae713 NB |
578 | { "used", 0, 0, true, false, false, |
579 | handle_used_attribute }, | |
580 | { "unused", 0, 0, false, false, false, | |
581 | handle_unused_attribute }, | |
ce91e74c JH |
582 | { "externally_visible", 0, 0, true, false, false, |
583 | handle_externally_visible_attribute }, | |
349ae713 NB |
584 | /* The same comments as for noreturn attributes apply to const ones. */ |
585 | { "const", 0, 0, true, false, false, | |
586 | handle_const_attribute }, | |
587 | { "transparent_union", 0, 0, false, false, false, | |
588 | handle_transparent_union_attribute }, | |
589 | { "constructor", 0, 0, true, false, false, | |
590 | handle_constructor_attribute }, | |
591 | { "destructor", 0, 0, true, false, false, | |
592 | handle_destructor_attribute }, | |
593 | { "mode", 1, 1, false, true, false, | |
594 | handle_mode_attribute }, | |
595 | { "section", 1, 1, true, false, false, | |
596 | handle_section_attribute }, | |
597 | { "aligned", 0, 1, false, false, false, | |
598 | handle_aligned_attribute }, | |
599 | { "weak", 0, 0, true, false, false, | |
600 | handle_weak_attribute }, | |
601 | { "alias", 1, 1, true, false, false, | |
602 | handle_alias_attribute }, | |
a0203ca7 AO |
603 | { "weakref", 0, 1, true, false, false, |
604 | handle_weakref_attribute }, | |
349ae713 NB |
605 | { "no_instrument_function", 0, 0, true, false, false, |
606 | handle_no_instrument_function_attribute }, | |
607 | { "malloc", 0, 0, true, false, false, | |
608 | handle_malloc_attribute }, | |
6e9a3221 AN |
609 | { "returns_twice", 0, 0, true, false, false, |
610 | handle_returns_twice_attribute }, | |
349ae713 NB |
611 | { "no_stack_limit", 0, 0, true, false, false, |
612 | handle_no_limit_stack_attribute }, | |
613 | { "pure", 0, 0, true, false, false, | |
614 | handle_pure_attribute }, | |
dcd6de6d ZD |
615 | /* For internal use (marking of builtins) only. The name contains space |
616 | to prevent its usage in source code. */ | |
617 | { "no vops", 0, 0, true, false, false, | |
618 | handle_novops_attribute }, | |
349ae713 NB |
619 | { "deprecated", 0, 0, false, false, false, |
620 | handle_deprecated_attribute }, | |
621 | { "vector_size", 1, 1, false, true, false, | |
622 | handle_vector_size_attribute }, | |
d7afec4b | 623 | { "visibility", 1, 1, false, false, false, |
349ae713 | 624 | handle_visibility_attribute }, |
dce81a1a JJ |
625 | { "tls_model", 1, 1, true, false, false, |
626 | handle_tls_model_attribute }, | |
b34c7881 JT |
627 | { "nonnull", 0, -1, false, true, true, |
628 | handle_nonnull_attribute }, | |
39f2f3c8 RS |
629 | { "nothrow", 0, 0, true, false, false, |
630 | handle_nothrow_attribute }, | |
d18b1ed8 | 631 | { "may_alias", 0, 0, false, true, false, NULL }, |
0bfa5f65 RH |
632 | { "cleanup", 1, 1, true, false, false, |
633 | handle_cleanup_attribute }, | |
72954a4f JM |
634 | { "warn_unused_result", 0, 0, false, true, true, |
635 | handle_warn_unused_result_attribute }, | |
254986c7 | 636 | { "sentinel", 0, 1, false, true, true, |
3d091dac | 637 | handle_sentinel_attribute }, |
349ae713 NB |
638 | { NULL, 0, 0, false, false, false, NULL } |
639 | }; | |
640 | ||
641 | /* Give the specifications for the format attributes, used by C and all | |
95bd1dd7 | 642 | descendants. */ |
349ae713 NB |
643 | |
644 | const struct attribute_spec c_common_format_attribute_table[] = | |
645 | { | |
646 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
647 | { "format", 3, 3, false, true, true, | |
648 | handle_format_attribute }, | |
649 | { "format_arg", 1, 1, false, true, true, | |
650 | handle_format_arg_attribute }, | |
651 | { NULL, 0, 0, false, false, false, NULL } | |
652 | }; | |
653 | ||
ec5c56db | 654 | /* Push current bindings for the function name VAR_DECLS. */ |
7da551a2 RS |
655 | |
656 | void | |
35b1a6fa | 657 | start_fname_decls (void) |
7da551a2 | 658 | { |
0ba8a114 NS |
659 | unsigned ix; |
660 | tree saved = NULL_TREE; | |
35b1a6fa | 661 | |
0ba8a114 NS |
662 | for (ix = 0; fname_vars[ix].decl; ix++) |
663 | { | |
664 | tree decl = *fname_vars[ix].decl; | |
7da551a2 | 665 | |
0ba8a114 NS |
666 | if (decl) |
667 | { | |
7d60be94 | 668 | saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved); |
0ba8a114 NS |
669 | *fname_vars[ix].decl = NULL_TREE; |
670 | } | |
671 | } | |
672 | if (saved || saved_function_name_decls) | |
673 | /* Normally they'll have been NULL, so only push if we've got a | |
674 | stack, or they are non-NULL. */ | |
675 | saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
676 | saved_function_name_decls); | |
677 | } | |
678 | ||
325c3691 RH |
679 | /* Finish up the current bindings, adding them into the current function's |
680 | statement tree. This must be done _before_ finish_stmt_tree is called. | |
681 | If there is no current function, we must be at file scope and no statements | |
682 | are involved. Pop the previous bindings. */ | |
0ba8a114 NS |
683 | |
684 | void | |
35b1a6fa | 685 | finish_fname_decls (void) |
0ba8a114 NS |
686 | { |
687 | unsigned ix; | |
325c3691 | 688 | tree stmts = NULL_TREE; |
0ba8a114 NS |
689 | tree stack = saved_function_name_decls; |
690 | ||
691 | for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
325c3691 | 692 | append_to_statement_list (TREE_VALUE (stack), &stmts); |
35b1a6fa | 693 | |
325c3691 | 694 | if (stmts) |
0ba8a114 | 695 | { |
325c3691 | 696 | tree *bodyp = &DECL_SAVED_TREE (current_function_decl); |
bfaba7a9 | 697 | |
325c3691 RH |
698 | if (TREE_CODE (*bodyp) == BIND_EXPR) |
699 | bodyp = &BIND_EXPR_BODY (*bodyp); | |
6cce57b0 | 700 | |
86ad3aa9 | 701 | append_to_statement_list_force (*bodyp, &stmts); |
325c3691 | 702 | *bodyp = stmts; |
0ba8a114 | 703 | } |
35b1a6fa | 704 | |
0ba8a114 NS |
705 | for (ix = 0; fname_vars[ix].decl; ix++) |
706 | *fname_vars[ix].decl = NULL_TREE; | |
35b1a6fa | 707 | |
0ba8a114 | 708 | if (stack) |
7da551a2 | 709 | { |
ec5c56db | 710 | /* We had saved values, restore them. */ |
0ba8a114 NS |
711 | tree saved; |
712 | ||
713 | for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
714 | { | |
715 | tree decl = TREE_PURPOSE (saved); | |
716 | unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
35b1a6fa | 717 | |
0ba8a114 NS |
718 | *fname_vars[ix].decl = decl; |
719 | } | |
720 | stack = TREE_CHAIN (stack); | |
7da551a2 | 721 | } |
0ba8a114 NS |
722 | saved_function_name_decls = stack; |
723 | } | |
724 | ||
6cce57b0 | 725 | /* Return the text name of the current function, suitably prettified |
0d0bc036 | 726 | by PRETTY_P. Return string must be freed by caller. */ |
0ba8a114 NS |
727 | |
728 | const char * | |
35b1a6fa | 729 | fname_as_string (int pretty_p) |
0ba8a114 | 730 | { |
47ab33b2 | 731 | const char *name = "top level"; |
0d0bc036 | 732 | char *namep; |
47ab33b2 MA |
733 | int vrb = 2; |
734 | ||
3f75a254 | 735 | if (!pretty_p) |
47ab33b2 MA |
736 | { |
737 | name = ""; | |
738 | vrb = 0; | |
739 | } | |
740 | ||
741 | if (current_function_decl) | |
ae2bcd98 | 742 | name = lang_hooks.decl_printable_name (current_function_decl, vrb); |
47ab33b2 | 743 | |
0d0bc036 AH |
744 | if (c_lex_string_translate) |
745 | { | |
746 | int len = strlen (name) + 3; /* Two for '"'s. One for NULL. */ | |
747 | cpp_string cstr = { 0, 0 }, strname; | |
748 | ||
28dab132 | 749 | namep = XNEWVEC (char, len); |
0d0bc036 AH |
750 | snprintf (namep, len, "\"%s\"", name); |
751 | strname.text = (unsigned char *) namep; | |
752 | strname.len = len - 1; | |
753 | ||
754 | if (cpp_interpret_string (parse_in, &strname, 1, &cstr, false)) | |
029fc60b KH |
755 | { |
756 | XDELETEVEC (namep); | |
757 | return (char *) cstr.text; | |
758 | } | |
0d0bc036 AH |
759 | } |
760 | else | |
5557d672 | 761 | namep = xstrdup (name); |
0d0bc036 AH |
762 | |
763 | return namep; | |
0ba8a114 NS |
764 | } |
765 | ||
3c79fa86 AP |
766 | /* Expand DECL if it declares an entity not handled by the |
767 | common code. */ | |
768 | ||
769 | int | |
770 | c_expand_decl (tree decl) | |
771 | { | |
772 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
773 | { | |
774 | /* Let the back-end know about this variable. */ | |
775 | if (!anon_aggr_type_p (TREE_TYPE (decl))) | |
776 | emit_local_var (decl); | |
777 | else | |
778 | expand_anon_union_decl (decl, NULL_TREE, | |
779 | DECL_ANON_UNION_ELEMS (decl)); | |
780 | } | |
3c79fa86 AP |
781 | else |
782 | return 0; | |
783 | ||
784 | return 1; | |
785 | } | |
786 | ||
787 | ||
0ba8a114 NS |
788 | /* Return the VAR_DECL for a const char array naming the current |
789 | function. If the VAR_DECL has not yet been created, create it | |
790 | now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
791 | ID is its name (unfortunately C and C++ hold the RID values of | |
792 | keywords in different places, so we can't derive RID from ID in | |
f63d1bf7 | 793 | this language independent code. */ |
0ba8a114 NS |
794 | |
795 | tree | |
35b1a6fa | 796 | fname_decl (unsigned int rid, tree id) |
0ba8a114 NS |
797 | { |
798 | unsigned ix; | |
799 | tree decl = NULL_TREE; | |
800 | ||
801 | for (ix = 0; fname_vars[ix].decl; ix++) | |
802 | if (fname_vars[ix].rid == rid) | |
803 | break; | |
804 | ||
805 | decl = *fname_vars[ix].decl; | |
806 | if (!decl) | |
7da551a2 | 807 | { |
8d3e27d1 DJ |
808 | /* If a tree is built here, it would normally have the lineno of |
809 | the current statement. Later this tree will be moved to the | |
810 | beginning of the function and this line number will be wrong. | |
811 | To avoid this problem set the lineno to 0 here; that prevents | |
4b7e68e7 | 812 | it from appearing in the RTL. */ |
325c3691 | 813 | tree stmts; |
3c20847b PB |
814 | location_t saved_location = input_location; |
815 | #ifdef USE_MAPPED_LOCATION | |
816 | input_location = UNKNOWN_LOCATION; | |
817 | #else | |
d479d37f | 818 | input_line = 0; |
3c20847b | 819 | #endif |
35b1a6fa | 820 | |
325c3691 | 821 | stmts = push_stmt_list (); |
0ba8a114 | 822 | decl = (*make_fname_decl) (id, fname_vars[ix].pretty); |
325c3691 RH |
823 | stmts = pop_stmt_list (stmts); |
824 | if (!IS_EMPTY_STMT (stmts)) | |
825 | saved_function_name_decls | |
826 | = tree_cons (decl, stmts, saved_function_name_decls); | |
0ba8a114 | 827 | *fname_vars[ix].decl = decl; |
3c20847b | 828 | input_location = saved_location; |
7da551a2 | 829 | } |
0ba8a114 | 830 | if (!ix && !current_function_decl) |
8b17a9d6 | 831 | pedwarn ("%qD is not defined outside of function scope", decl); |
6cce57b0 | 832 | |
0ba8a114 | 833 | return decl; |
7da551a2 RS |
834 | } |
835 | ||
b84a3874 | 836 | /* Given a STRING_CST, give it a suitable array-of-chars data type. */ |
b30f223b RS |
837 | |
838 | tree | |
35b1a6fa | 839 | fix_string_type (tree value) |
b30f223b | 840 | { |
b84a3874 RH |
841 | const int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; |
842 | const int wide_flag = TREE_TYPE (value) == wchar_array_type_node; | |
1326a48b | 843 | const int nchars_max = flag_isoc99 ? 4095 : 509; |
b84a3874 RH |
844 | int length = TREE_STRING_LENGTH (value); |
845 | int nchars; | |
c162c75e MA |
846 | tree e_type, i_type, a_type; |
847 | ||
b57062ca | 848 | /* Compute the number of elements, for the array type. */ |
b30f223b RS |
849 | nchars = wide_flag ? length / wchar_bytes : length; |
850 | ||
37fa72e9 | 851 | if (pedantic && nchars - 1 > nchars_max && !c_dialect_cxx ()) |
bda67431 | 852 | pedwarn ("string length %qd is greater than the length %qd ISO C%d compilers are required to support", |
690c96c8 | 853 | nchars - 1, nchars_max, flag_isoc99 ? 99 : 89); |
1326a48b | 854 | |
4a90aeeb | 855 | e_type = wide_flag ? wchar_type_node : char_type_node; |
c162c75e MA |
856 | /* Create the array type for the string constant. flag_const_strings |
857 | says make the string constant an array of const char so that | |
858 | copying it to a non-const pointer will get a warning. For C++, | |
859 | this is the standard behavior. | |
860 | ||
861 | The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified | |
862 | array type being the unqualified version of that type. | |
863 | Therefore, if we are constructing an array of const char, we must | |
864 | construct the matching unqualified array type first. The C front | |
865 | end does not require this, but it does no harm, so we do it | |
866 | unconditionally. */ | |
7d60be94 | 867 | i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1)); |
c162c75e MA |
868 | a_type = build_array_type (e_type, i_type); |
869 | if (flag_const_strings) | |
46df2823 | 870 | a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST); |
d9cf7c82 | 871 | |
c162c75e | 872 | TREE_TYPE (value) = a_type; |
ccd4c832 | 873 | TREE_CONSTANT (value) = 1; |
6de9cd9a | 874 | TREE_INVARIANT (value) = 1; |
3521b33c | 875 | TREE_READONLY (value) = 1; |
b30f223b RS |
876 | TREE_STATIC (value) = 1; |
877 | return value; | |
878 | } | |
879 | \f | |
d74154d5 RS |
880 | /* Print a warning if a constant expression had overflow in folding. |
881 | Invoke this function on every expression that the language | |
882 | requires to be a constant expression. | |
883 | Note the ANSI C standard says it is erroneous for a | |
884 | constant expression to overflow. */ | |
96571883 BK |
885 | |
886 | void | |
35b1a6fa | 887 | constant_expression_warning (tree value) |
96571883 | 888 | { |
c05f751c | 889 | if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST |
69ef87e2 | 890 | || TREE_CODE (value) == VECTOR_CST |
c05f751c RK |
891 | || TREE_CODE (value) == COMPLEX_CST) |
892 | && TREE_CONSTANT_OVERFLOW (value) && pedantic) | |
893 | pedwarn ("overflow in constant expression"); | |
d74154d5 RS |
894 | } |
895 | ||
896 | /* Print a warning if an expression had overflow in folding. | |
897 | Invoke this function on every expression that | |
898 | (1) appears in the source code, and | |
899 | (2) might be a constant expression that overflowed, and | |
900 | (3) is not already checked by convert_and_check; | |
901 | however, do not invoke this function on operands of explicit casts. */ | |
902 | ||
903 | void | |
35b1a6fa | 904 | overflow_warning (tree value) |
d74154d5 | 905 | { |
c05f751c RK |
906 | if ((TREE_CODE (value) == INTEGER_CST |
907 | || (TREE_CODE (value) == COMPLEX_CST | |
908 | && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST)) | |
909 | && TREE_OVERFLOW (value)) | |
d74154d5 | 910 | { |
7193bce2 | 911 | TREE_OVERFLOW (value) = 0; |
e78a3b42 | 912 | if (skip_evaluation == 0) |
d4ee4d25 | 913 | warning (0, "integer overflow in expression"); |
d74154d5 | 914 | } |
c05f751c RK |
915 | else if ((TREE_CODE (value) == REAL_CST |
916 | || (TREE_CODE (value) == COMPLEX_CST | |
917 | && TREE_CODE (TREE_REALPART (value)) == REAL_CST)) | |
918 | && TREE_OVERFLOW (value)) | |
919 | { | |
920 | TREE_OVERFLOW (value) = 0; | |
e78a3b42 | 921 | if (skip_evaluation == 0) |
d4ee4d25 | 922 | warning (0, "floating point overflow in expression"); |
c05f751c | 923 | } |
69ef87e2 AH |
924 | else if (TREE_CODE (value) == VECTOR_CST && TREE_OVERFLOW (value)) |
925 | { | |
926 | TREE_OVERFLOW (value) = 0; | |
927 | if (skip_evaluation == 0) | |
d4ee4d25 | 928 | warning (0, "vector overflow in expression"); |
69ef87e2 | 929 | } |
d74154d5 RS |
930 | } |
931 | ||
932 | /* Print a warning if a large constant is truncated to unsigned, | |
933 | or if -Wconversion is used and a constant < 0 is converted to unsigned. | |
934 | Invoke this function on every expression that might be implicitly | |
935 | converted to an unsigned type. */ | |
936 | ||
937 | void | |
35b1a6fa | 938 | unsigned_conversion_warning (tree result, tree operand) |
d74154d5 | 939 | { |
ceef8ce4 NB |
940 | tree type = TREE_TYPE (result); |
941 | ||
d74154d5 | 942 | if (TREE_CODE (operand) == INTEGER_CST |
ceef8ce4 | 943 | && TREE_CODE (type) == INTEGER_TYPE |
8df83eae | 944 | && TYPE_UNSIGNED (type) |
e78a3b42 | 945 | && skip_evaluation == 0 |
ceef8ce4 | 946 | && !int_fits_type_p (operand, type)) |
d74154d5 | 947 | { |
ceef8ce4 | 948 | if (!int_fits_type_p (operand, c_common_signed_type (type))) |
d74154d5 | 949 | /* This detects cases like converting -129 or 256 to unsigned char. */ |
d4ee4d25 | 950 | warning (0, "large integer implicitly truncated to unsigned type"); |
44c21c7f DD |
951 | else |
952 | warning (OPT_Wconversion, | |
953 | "negative integer implicitly converted to unsigned type"); | |
d74154d5 RS |
954 | } |
955 | } | |
956 | ||
de9c56a4 RG |
957 | /* Print a warning about casts that might indicate violation |
958 | of strict aliasing rules if -Wstrict-aliasing is used and | |
959 | strict aliasing mode is in effect. otype is the original | |
960 | TREE_TYPE of expr, and type the type we're casting to. */ | |
961 | ||
962 | void | |
963 | strict_aliasing_warning(tree otype, tree type, tree expr) | |
964 | { | |
965 | if (flag_strict_aliasing && warn_strict_aliasing | |
966 | && POINTER_TYPE_P (type) && POINTER_TYPE_P (otype) | |
967 | && TREE_CODE (expr) == ADDR_EXPR | |
968 | && (DECL_P (TREE_OPERAND (expr, 0)) | |
bbee4b64 | 969 | || handled_component_p (TREE_OPERAND (expr, 0))) |
de9c56a4 RG |
970 | && !VOID_TYPE_P (TREE_TYPE (type))) |
971 | { | |
972 | /* Casting the address of an object to non void pointer. Warn | |
973 | if the cast breaks type based aliasing. */ | |
974 | if (!COMPLETE_TYPE_P (TREE_TYPE (type))) | |
975 | warning (OPT_Wstrict_aliasing, "type-punning to incomplete type " | |
976 | "might break strict-aliasing rules"); | |
977 | else | |
978 | { | |
979 | HOST_WIDE_INT set1 = get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))); | |
980 | HOST_WIDE_INT set2 = get_alias_set (TREE_TYPE (type)); | |
981 | ||
982 | if (!alias_sets_conflict_p (set1, set2)) | |
983 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
984 | "pointer will break strict-aliasing rules"); | |
985 | else if (warn_strict_aliasing > 1 | |
986 | && !alias_sets_might_conflict_p (set1, set2)) | |
987 | warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
988 | "pointer might break strict-aliasing rules"); | |
989 | } | |
990 | } | |
991 | } | |
992 | ||
d02b54f6 JJ |
993 | /* Nonzero if constant C has a value that is permissible |
994 | for type TYPE (an INTEGER_TYPE). */ | |
995 | ||
996 | static int | |
35b1a6fa | 997 | constant_fits_type_p (tree c, tree type) |
d02b54f6 JJ |
998 | { |
999 | if (TREE_CODE (c) == INTEGER_CST) | |
1000 | return int_fits_type_p (c, type); | |
1001 | ||
1002 | c = convert (type, c); | |
1003 | return !TREE_OVERFLOW (c); | |
35b1a6fa | 1004 | } |
d02b54f6 | 1005 | |
cc27e657 PB |
1006 | /* Nonzero if vector types T1 and T2 can be converted to each other |
1007 | without an explicit cast. */ | |
1008 | int | |
1009 | vector_types_convertible_p (tree t1, tree t2) | |
1010 | { | |
1011 | return targetm.vector_opaque_p (t1) | |
1012 | || targetm.vector_opaque_p (t2) | |
3a021db2 | 1013 | || (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)) |
2c47f875 | 1014 | && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE || |
a04deb83 | 1015 | TYPE_PRECISION (t1) == TYPE_PRECISION (t2)) |
3a021db2 PB |
1016 | && INTEGRAL_TYPE_P (TREE_TYPE (t1)) |
1017 | == INTEGRAL_TYPE_P (TREE_TYPE (t2))); | |
cc27e657 PB |
1018 | } |
1019 | ||
d74154d5 RS |
1020 | /* Convert EXPR to TYPE, warning about conversion problems with constants. |
1021 | Invoke this function on every expression that is converted implicitly, | |
1022 | i.e. because of language rules and not because of an explicit cast. */ | |
1023 | ||
1024 | tree | |
35b1a6fa | 1025 | convert_and_check (tree type, tree expr) |
d74154d5 RS |
1026 | { |
1027 | tree t = convert (type, expr); | |
1028 | if (TREE_CODE (t) == INTEGER_CST) | |
1029 | { | |
7193bce2 | 1030 | if (TREE_OVERFLOW (t)) |
d74154d5 | 1031 | { |
7193bce2 PE |
1032 | TREE_OVERFLOW (t) = 0; |
1033 | ||
868fc750 RK |
1034 | /* Do not diagnose overflow in a constant expression merely |
1035 | because a conversion overflowed. */ | |
1036 | TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr); | |
1037 | ||
7193bce2 | 1038 | /* No warning for converting 0x80000000 to int. */ |
8df83eae | 1039 | if (!(TYPE_UNSIGNED (type) < TYPE_UNSIGNED (TREE_TYPE (expr)) |
7193bce2 PE |
1040 | && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE |
1041 | && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr)))) | |
22ba338b RS |
1042 | /* If EXPR fits in the unsigned version of TYPE, |
1043 | don't warn unless pedantic. */ | |
e78a3b42 | 1044 | if ((pedantic |
8df83eae | 1045 | || TYPE_UNSIGNED (type) |
3f75a254 JM |
1046 | || !constant_fits_type_p (expr, |
1047 | c_common_unsigned_type (type))) | |
6de9cd9a | 1048 | && skip_evaluation == 0) |
d4ee4d25 | 1049 | warning (0, "overflow in implicit constant conversion"); |
d74154d5 RS |
1050 | } |
1051 | else | |
1052 | unsigned_conversion_warning (t, expr); | |
1053 | } | |
1054 | return t; | |
96571883 BK |
1055 | } |
1056 | \f | |
235cfbc4 BS |
1057 | /* A node in a list that describes references to variables (EXPR), which are |
1058 | either read accesses if WRITER is zero, or write accesses, in which case | |
1059 | WRITER is the parent of EXPR. */ | |
1060 | struct tlist | |
1061 | { | |
1062 | struct tlist *next; | |
1063 | tree expr, writer; | |
1064 | }; | |
1065 | ||
1066 | /* Used to implement a cache the results of a call to verify_tree. We only | |
1067 | use this for SAVE_EXPRs. */ | |
1068 | struct tlist_cache | |
1069 | { | |
1070 | struct tlist_cache *next; | |
1071 | struct tlist *cache_before_sp; | |
1072 | struct tlist *cache_after_sp; | |
1073 | tree expr; | |
2683ed8d BS |
1074 | }; |
1075 | ||
235cfbc4 BS |
1076 | /* Obstack to use when allocating tlist structures, and corresponding |
1077 | firstobj. */ | |
1078 | static struct obstack tlist_obstack; | |
1079 | static char *tlist_firstobj = 0; | |
1080 | ||
1081 | /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
1082 | warnings. */ | |
1083 | static struct tlist *warned_ids; | |
1084 | /* SAVE_EXPRs need special treatment. We process them only once and then | |
1085 | cache the results. */ | |
1086 | static struct tlist_cache *save_expr_cache; | |
1087 | ||
35b1a6fa AJ |
1088 | static void add_tlist (struct tlist **, struct tlist *, tree, int); |
1089 | static void merge_tlist (struct tlist **, struct tlist *, int); | |
1090 | static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
1091 | static int warning_candidate_p (tree); | |
1092 | static void warn_for_collisions (struct tlist *); | |
1093 | static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
1094 | static struct tlist *new_tlist (struct tlist *, tree, tree); | |
2683ed8d | 1095 | |
235cfbc4 BS |
1096 | /* Create a new struct tlist and fill in its fields. */ |
1097 | static struct tlist * | |
35b1a6fa | 1098 | new_tlist (struct tlist *next, tree t, tree writer) |
235cfbc4 BS |
1099 | { |
1100 | struct tlist *l; | |
5d038c4c | 1101 | l = XOBNEW (&tlist_obstack, struct tlist); |
235cfbc4 BS |
1102 | l->next = next; |
1103 | l->expr = t; | |
1104 | l->writer = writer; | |
1105 | return l; | |
1106 | } | |
1107 | ||
1108 | /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
1109 | is nonnull, we ignore any node we find which has a writer equal to it. */ | |
1110 | ||
1111 | static void | |
35b1a6fa | 1112 | add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) |
235cfbc4 BS |
1113 | { |
1114 | while (add) | |
1115 | { | |
1116 | struct tlist *next = add->next; | |
3f75a254 | 1117 | if (!copy) |
235cfbc4 | 1118 | add->next = *to; |
3f75a254 | 1119 | if (!exclude_writer || add->writer != exclude_writer) |
235cfbc4 BS |
1120 | *to = copy ? new_tlist (*to, add->expr, add->writer) : add; |
1121 | add = next; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | /* Merge the nodes of ADD into TO. This merging process is done so that for | |
1126 | each variable that already exists in TO, no new node is added; however if | |
1127 | there is a write access recorded in ADD, and an occurrence on TO is only | |
1128 | a read access, then the occurrence in TO will be modified to record the | |
1129 | write. */ | |
2683ed8d BS |
1130 | |
1131 | static void | |
35b1a6fa | 1132 | merge_tlist (struct tlist **to, struct tlist *add, int copy) |
235cfbc4 BS |
1133 | { |
1134 | struct tlist **end = to; | |
1135 | ||
1136 | while (*end) | |
1137 | end = &(*end)->next; | |
1138 | ||
1139 | while (add) | |
1140 | { | |
1141 | int found = 0; | |
1142 | struct tlist *tmp2; | |
1143 | struct tlist *next = add->next; | |
1144 | ||
1145 | for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
1146 | if (tmp2->expr == add->expr) | |
1147 | { | |
1148 | found = 1; | |
3f75a254 | 1149 | if (!tmp2->writer) |
235cfbc4 BS |
1150 | tmp2->writer = add->writer; |
1151 | } | |
3f75a254 | 1152 | if (!found) |
235cfbc4 BS |
1153 | { |
1154 | *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
1155 | end = &(*end)->next; | |
1156 | *end = 0; | |
1157 | } | |
1158 | add = next; | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
1163 | references in list LIST conflict with it, excluding reads if ONLY writers | |
1164 | is nonzero. */ | |
1165 | ||
1166 | static void | |
35b1a6fa AJ |
1167 | warn_for_collisions_1 (tree written, tree writer, struct tlist *list, |
1168 | int only_writes) | |
235cfbc4 BS |
1169 | { |
1170 | struct tlist *tmp; | |
1171 | ||
1172 | /* Avoid duplicate warnings. */ | |
1173 | for (tmp = warned_ids; tmp; tmp = tmp->next) | |
1174 | if (tmp->expr == written) | |
1175 | return; | |
1176 | ||
1177 | while (list) | |
1178 | { | |
1179 | if (list->expr == written | |
1180 | && list->writer != writer | |
3f75a254 | 1181 | && (!only_writes || list->writer) |
e3790655 | 1182 | && DECL_NAME (list->expr)) |
235cfbc4 BS |
1183 | { |
1184 | warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
d4ee4d25 | 1185 | warning (0, "operation on %qE may be undefined", list->expr); |
235cfbc4 BS |
1186 | } |
1187 | list = list->next; | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | /* Given a list LIST of references to variables, find whether any of these | |
1192 | can cause conflicts due to missing sequence points. */ | |
1193 | ||
1194 | static void | |
35b1a6fa | 1195 | warn_for_collisions (struct tlist *list) |
235cfbc4 BS |
1196 | { |
1197 | struct tlist *tmp; | |
35b1a6fa | 1198 | |
235cfbc4 BS |
1199 | for (tmp = list; tmp; tmp = tmp->next) |
1200 | { | |
1201 | if (tmp->writer) | |
1202 | warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
1203 | } | |
1204 | } | |
1205 | ||
684d9f3b | 1206 | /* Return nonzero if X is a tree that can be verified by the sequence point |
235cfbc4 BS |
1207 | warnings. */ |
1208 | static int | |
35b1a6fa | 1209 | warning_candidate_p (tree x) |
2683ed8d | 1210 | { |
235cfbc4 BS |
1211 | return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL; |
1212 | } | |
2683ed8d | 1213 | |
235cfbc4 BS |
1214 | /* Walk the tree X, and record accesses to variables. If X is written by the |
1215 | parent tree, WRITER is the parent. | |
1216 | We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
1217 | expression or its only operand forces a sequence point, then everything up | |
1218 | to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
1219 | in PNO_SP. | |
1220 | Once we return, we will have emitted warnings if any subexpression before | |
1221 | such a sequence point could be undefined. On a higher level, however, the | |
1222 | sequence point may not be relevant, and we'll merge the two lists. | |
1223 | ||
1224 | Example: (b++, a) + b; | |
1225 | The call that processes the COMPOUND_EXPR will store the increment of B | |
1226 | in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
1227 | processes the PLUS_EXPR will need to merge the two lists so that | |
1228 | eventually, all accesses end up on the same list (and we'll warn about the | |
1229 | unordered subexpressions b++ and b. | |
1230 | ||
1231 | A note on merging. If we modify the former example so that our expression | |
1232 | becomes | |
1233 | (b++, b) + a | |
1234 | care must be taken not simply to add all three expressions into the final | |
1235 | PNO_SP list. The function merge_tlist takes care of that by merging the | |
1236 | before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
1237 | way, so that no more than one access to B is recorded. */ | |
2683ed8d | 1238 | |
235cfbc4 | 1239 | static void |
35b1a6fa AJ |
1240 | verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, |
1241 | tree writer) | |
235cfbc4 BS |
1242 | { |
1243 | struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
1244 | enum tree_code code; | |
6615c446 | 1245 | enum tree_code_class cl; |
2683ed8d | 1246 | |
f9e1917e JM |
1247 | /* X may be NULL if it is the operand of an empty statement expression |
1248 | ({ }). */ | |
1249 | if (x == NULL) | |
1250 | return; | |
1251 | ||
235cfbc4 BS |
1252 | restart: |
1253 | code = TREE_CODE (x); | |
e3a64162 | 1254 | cl = TREE_CODE_CLASS (code); |
2683ed8d | 1255 | |
235cfbc4 | 1256 | if (warning_candidate_p (x)) |
2683ed8d | 1257 | { |
235cfbc4 BS |
1258 | *pno_sp = new_tlist (*pno_sp, x, writer); |
1259 | return; | |
1260 | } | |
1261 | ||
1262 | switch (code) | |
1263 | { | |
52a84e42 BS |
1264 | case CONSTRUCTOR: |
1265 | return; | |
1266 | ||
235cfbc4 BS |
1267 | case COMPOUND_EXPR: |
1268 | case TRUTH_ANDIF_EXPR: | |
1269 | case TRUTH_ORIF_EXPR: | |
1270 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1271 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1272 | warn_for_collisions (tmp_nosp); | |
1273 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1274 | merge_tlist (pbefore_sp, tmp_nosp, 0); | |
1275 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
1276 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1277 | return; | |
1278 | ||
1279 | case COND_EXPR: | |
1280 | tmp_before = tmp_list2 = 0; | |
1281 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
1282 | warn_for_collisions (tmp_list2); | |
1283 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1284 | merge_tlist (pbefore_sp, tmp_list2, 1); | |
1285 | ||
1286 | tmp_list3 = tmp_nosp = 0; | |
1287 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
1288 | warn_for_collisions (tmp_nosp); | |
1289 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1290 | ||
1291 | tmp_list3 = tmp_list2 = 0; | |
1292 | verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
1293 | warn_for_collisions (tmp_list2); | |
1294 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1295 | /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
1296 | two first, to avoid warning for (a ? b++ : b++). */ | |
1297 | merge_tlist (&tmp_nosp, tmp_list2, 0); | |
1298 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1299 | return; | |
1300 | ||
2683ed8d BS |
1301 | case PREDECREMENT_EXPR: |
1302 | case PREINCREMENT_EXPR: | |
1303 | case POSTDECREMENT_EXPR: | |
1304 | case POSTINCREMENT_EXPR: | |
235cfbc4 BS |
1305 | verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); |
1306 | return; | |
1307 | ||
1308 | case MODIFY_EXPR: | |
1309 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1310 | verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
1311 | verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
1312 | /* Expressions inside the LHS are not ordered wrt. the sequence points | |
1313 | in the RHS. Example: | |
1314 | *a = (a++, 2) | |
1315 | Despite the fact that the modification of "a" is in the before_sp | |
1316 | list (tmp_before), it conflicts with the use of "a" in the LHS. | |
1317 | We can handle this by adding the contents of tmp_list3 | |
1318 | to those of tmp_before, and redoing the collision warnings for that | |
1319 | list. */ | |
1320 | add_tlist (&tmp_before, tmp_list3, x, 1); | |
1321 | warn_for_collisions (tmp_before); | |
1322 | /* Exclude the LHS itself here; we first have to merge it into the | |
1323 | tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
1324 | didn't exclude the LHS, we'd get it twice, once as a read and once | |
1325 | as a write. */ | |
1326 | add_tlist (pno_sp, tmp_list3, x, 0); | |
1327 | warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
1328 | ||
1329 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1330 | if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
1331 | merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
1332 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
1333 | return; | |
2683ed8d BS |
1334 | |
1335 | case CALL_EXPR: | |
235cfbc4 BS |
1336 | /* We need to warn about conflicts among arguments and conflicts between |
1337 | args and the function address. Side effects of the function address, | |
1338 | however, are not ordered by the sequence point of the call. */ | |
1339 | tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0; | |
1340 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1341 | if (TREE_OPERAND (x, 1)) | |
1342 | verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE); | |
1343 | merge_tlist (&tmp_list3, tmp_list2, 0); | |
1344 | add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
1345 | add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
1346 | warn_for_collisions (tmp_before); | |
1347 | add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
1348 | return; | |
2683ed8d BS |
1349 | |
1350 | case TREE_LIST: | |
1351 | /* Scan all the list, e.g. indices of multi dimensional array. */ | |
1352 | while (x) | |
1353 | { | |
235cfbc4 BS |
1354 | tmp_before = tmp_nosp = 0; |
1355 | verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
1356 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1357 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2683ed8d BS |
1358 | x = TREE_CHAIN (x); |
1359 | } | |
235cfbc4 | 1360 | return; |
2683ed8d | 1361 | |
235cfbc4 BS |
1362 | case SAVE_EXPR: |
1363 | { | |
1364 | struct tlist_cache *t; | |
1365 | for (t = save_expr_cache; t; t = t->next) | |
1366 | if (t->expr == x) | |
1367 | break; | |
2683ed8d | 1368 | |
3f75a254 | 1369 | if (!t) |
2683ed8d | 1370 | { |
5d038c4c | 1371 | t = XOBNEW (&tlist_obstack, struct tlist_cache); |
235cfbc4 BS |
1372 | t->next = save_expr_cache; |
1373 | t->expr = x; | |
1374 | save_expr_cache = t; | |
1375 | ||
1376 | tmp_before = tmp_nosp = 0; | |
1377 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1378 | warn_for_collisions (tmp_nosp); | |
1379 | ||
1380 | tmp_list3 = 0; | |
1381 | while (tmp_nosp) | |
1382 | { | |
1383 | struct tlist *t = tmp_nosp; | |
1384 | tmp_nosp = t->next; | |
1385 | merge_tlist (&tmp_list3, t, 0); | |
1386 | } | |
1387 | t->cache_before_sp = tmp_before; | |
1388 | t->cache_after_sp = tmp_list3; | |
2683ed8d | 1389 | } |
235cfbc4 BS |
1390 | merge_tlist (pbefore_sp, t->cache_before_sp, 1); |
1391 | add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
1392 | return; | |
1393 | } | |
2683ed8d | 1394 | |
6615c446 JO |
1395 | default: |
1396 | /* For other expressions, simply recurse on their operands. | |
1397 | Manual tail recursion for unary expressions. | |
1398 | Other non-expressions need not be processed. */ | |
1399 | if (cl == tcc_unary) | |
1400 | { | |
6615c446 JO |
1401 | x = TREE_OPERAND (x, 0); |
1402 | writer = 0; | |
1403 | goto restart; | |
1404 | } | |
1405 | else if (IS_EXPR_CODE_CLASS (cl)) | |
1406 | { | |
1407 | int lp; | |
54e4aedb | 1408 | int max = TREE_CODE_LENGTH (TREE_CODE (x)); |
6615c446 JO |
1409 | for (lp = 0; lp < max; lp++) |
1410 | { | |
1411 | tmp_before = tmp_nosp = 0; | |
1412 | verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0); | |
1413 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1414 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1415 | } | |
1416 | } | |
1417 | return; | |
2683ed8d | 1418 | } |
2683ed8d BS |
1419 | } |
1420 | ||
8d9afc4e | 1421 | /* Try to warn for undefined behavior in EXPR due to missing sequence |
2683ed8d BS |
1422 | points. */ |
1423 | ||
3a5b9284 | 1424 | void |
35b1a6fa | 1425 | verify_sequence_points (tree expr) |
2683ed8d | 1426 | { |
235cfbc4 | 1427 | struct tlist *before_sp = 0, *after_sp = 0; |
2683ed8d | 1428 | |
235cfbc4 BS |
1429 | warned_ids = 0; |
1430 | save_expr_cache = 0; | |
1431 | if (tlist_firstobj == 0) | |
2683ed8d | 1432 | { |
235cfbc4 | 1433 | gcc_obstack_init (&tlist_obstack); |
28dab132 | 1434 | tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0); |
2683ed8d BS |
1435 | } |
1436 | ||
235cfbc4 BS |
1437 | verify_tree (expr, &before_sp, &after_sp, 0); |
1438 | warn_for_collisions (after_sp); | |
1439 | obstack_free (&tlist_obstack, tlist_firstobj); | |
2683ed8d | 1440 | } |
b30f223b RS |
1441 | \f |
1442 | /* Validate the expression after `case' and apply default promotions. */ | |
1443 | ||
a6c0a76c | 1444 | static tree |
35b1a6fa | 1445 | check_case_value (tree value) |
b30f223b RS |
1446 | { |
1447 | if (value == NULL_TREE) | |
1448 | return value; | |
1449 | ||
ed248cf7 JM |
1450 | /* ??? Can we ever get nops here for a valid case value? We |
1451 | shouldn't for C. */ | |
8493738b | 1452 | STRIP_TYPE_NOPS (value); |
56cb9733 MM |
1453 | /* In C++, the following is allowed: |
1454 | ||
1455 | const int i = 3; | |
1456 | switch (...) { case i: ... } | |
1457 | ||
1458 | So, we try to reduce the VALUE to a constant that way. */ | |
37fa72e9 | 1459 | if (c_dialect_cxx ()) |
56cb9733 MM |
1460 | { |
1461 | value = decl_constant_value (value); | |
1462 | STRIP_TYPE_NOPS (value); | |
1463 | value = fold (value); | |
1464 | } | |
b30f223b | 1465 | |
522ddfa2 JM |
1466 | if (TREE_CODE (value) == INTEGER_CST) |
1467 | /* Promote char or short to int. */ | |
1468 | value = perform_integral_promotions (value); | |
1469 | else if (value != error_mark_node) | |
b30f223b RS |
1470 | { |
1471 | error ("case label does not reduce to an integer constant"); | |
1472 | value = error_mark_node; | |
1473 | } | |
b30f223b | 1474 | |
bc690db1 RS |
1475 | constant_expression_warning (value); |
1476 | ||
b30f223b RS |
1477 | return value; |
1478 | } | |
1479 | \f | |
a6c0a76c | 1480 | /* See if the case values LOW and HIGH are in the range of the original |
89dbed81 | 1481 | type (i.e. before the default conversion to int) of the switch testing |
a6c0a76c SB |
1482 | expression. |
1483 | TYPE is the promoted type of the testing expression, and ORIG_TYPE is | |
2a7e31df | 1484 | the type before promoting it. CASE_LOW_P is a pointer to the lower |
a6c0a76c SB |
1485 | bound of the case label, and CASE_HIGH_P is the upper bound or NULL |
1486 | if the case is not a case range. | |
1487 | The caller has to make sure that we are not called with NULL for | |
89dbed81 | 1488 | CASE_LOW_P (i.e. the default case). |
0fa2e4df | 1489 | Returns true if the case label is in range of ORIG_TYPE (saturated or |
a6c0a76c SB |
1490 | untouched) or false if the label is out of range. */ |
1491 | ||
1492 | static bool | |
1493 | check_case_bounds (tree type, tree orig_type, | |
1494 | tree *case_low_p, tree *case_high_p) | |
1495 | { | |
1496 | tree min_value, max_value; | |
1497 | tree case_low = *case_low_p; | |
1498 | tree case_high = case_high_p ? *case_high_p : case_low; | |
1499 | ||
1500 | /* If there was a problem with the original type, do nothing. */ | |
1501 | if (orig_type == error_mark_node) | |
1502 | return true; | |
1503 | ||
1504 | min_value = TYPE_MIN_VALUE (orig_type); | |
1505 | max_value = TYPE_MAX_VALUE (orig_type); | |
1506 | ||
1507 | /* Case label is less than minimum for type. */ | |
1508 | if (tree_int_cst_compare (case_low, min_value) < 0 | |
1509 | && tree_int_cst_compare (case_high, min_value) < 0) | |
1510 | { | |
d4ee4d25 | 1511 | warning (0, "case label value is less than minimum value for type"); |
a6c0a76c SB |
1512 | return false; |
1513 | } | |
9f63daea | 1514 | |
a6c0a76c SB |
1515 | /* Case value is greater than maximum for type. */ |
1516 | if (tree_int_cst_compare (case_low, max_value) > 0 | |
1517 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1518 | { | |
d4ee4d25 | 1519 | warning (0, "case label value exceeds maximum value for type"); |
a6c0a76c SB |
1520 | return false; |
1521 | } | |
1522 | ||
1523 | /* Saturate lower case label value to minimum. */ | |
1524 | if (tree_int_cst_compare (case_high, min_value) >= 0 | |
1525 | && tree_int_cst_compare (case_low, min_value) < 0) | |
1526 | { | |
d4ee4d25 | 1527 | warning (0, "lower value in case label range" |
a6c0a76c SB |
1528 | " less than minimum value for type"); |
1529 | case_low = min_value; | |
1530 | } | |
9f63daea | 1531 | |
a6c0a76c SB |
1532 | /* Saturate upper case label value to maximum. */ |
1533 | if (tree_int_cst_compare (case_low, max_value) <= 0 | |
1534 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1535 | { | |
d4ee4d25 | 1536 | warning (0, "upper value in case label range" |
a6c0a76c SB |
1537 | " exceeds maximum value for type"); |
1538 | case_high = max_value; | |
1539 | } | |
1540 | ||
1541 | if (*case_low_p != case_low) | |
1542 | *case_low_p = convert (type, case_low); | |
1543 | if (case_high_p && *case_high_p != case_high) | |
1544 | *case_high_p = convert (type, case_high); | |
1545 | ||
1546 | return true; | |
1547 | } | |
1548 | \f | |
b30f223b RS |
1549 | /* Return an integer type with BITS bits of precision, |
1550 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
1551 | ||
1552 | tree | |
35b1a6fa | 1553 | c_common_type_for_size (unsigned int bits, int unsignedp) |
b30f223b | 1554 | { |
a311b52c JM |
1555 | if (bits == TYPE_PRECISION (integer_type_node)) |
1556 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1557 | ||
3fc7e390 | 1558 | if (bits == TYPE_PRECISION (signed_char_type_node)) |
b30f223b RS |
1559 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
1560 | ||
3fc7e390 | 1561 | if (bits == TYPE_PRECISION (short_integer_type_node)) |
b30f223b RS |
1562 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
1563 | ||
3fc7e390 | 1564 | if (bits == TYPE_PRECISION (long_integer_type_node)) |
b30f223b RS |
1565 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
1566 | ||
3fc7e390 | 1567 | if (bits == TYPE_PRECISION (long_long_integer_type_node)) |
b30f223b RS |
1568 | return (unsignedp ? long_long_unsigned_type_node |
1569 | : long_long_integer_type_node); | |
1570 | ||
835f9b4d GRK |
1571 | if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) |
1572 | return (unsignedp ? widest_unsigned_literal_type_node | |
1573 | : widest_integer_literal_type_node); | |
1574 | ||
3fc7e390 RS |
1575 | if (bits <= TYPE_PRECISION (intQI_type_node)) |
1576 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
1577 | ||
1578 | if (bits <= TYPE_PRECISION (intHI_type_node)) | |
1579 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
1580 | ||
1581 | if (bits <= TYPE_PRECISION (intSI_type_node)) | |
1582 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
1583 | ||
1584 | if (bits <= TYPE_PRECISION (intDI_type_node)) | |
1585 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
1586 | ||
b30f223b RS |
1587 | return 0; |
1588 | } | |
1589 | ||
d1d3865f ZW |
1590 | /* Used for communication between c_common_type_for_mode and |
1591 | c_register_builtin_type. */ | |
1592 | static GTY(()) tree registered_builtin_types; | |
1593 | ||
b30f223b RS |
1594 | /* Return a data type that has machine mode MODE. |
1595 | If the mode is an integer, | |
1596 | then UNSIGNEDP selects between signed and unsigned types. */ | |
1597 | ||
1598 | tree | |
35b1a6fa | 1599 | c_common_type_for_mode (enum machine_mode mode, int unsignedp) |
b30f223b | 1600 | { |
d1d3865f ZW |
1601 | tree t; |
1602 | ||
a311b52c JM |
1603 | if (mode == TYPE_MODE (integer_type_node)) |
1604 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1605 | ||
b30f223b RS |
1606 | if (mode == TYPE_MODE (signed_char_type_node)) |
1607 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1608 | ||
1609 | if (mode == TYPE_MODE (short_integer_type_node)) | |
1610 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1611 | ||
b30f223b RS |
1612 | if (mode == TYPE_MODE (long_integer_type_node)) |
1613 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1614 | ||
1615 | if (mode == TYPE_MODE (long_long_integer_type_node)) | |
1616 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
1617 | ||
835f9b4d | 1618 | if (mode == TYPE_MODE (widest_integer_literal_type_node)) |
d125d268 | 1619 | return unsignedp ? widest_unsigned_literal_type_node |
6de9cd9a | 1620 | : widest_integer_literal_type_node; |
835f9b4d | 1621 | |
0afeef64 | 1622 | if (mode == QImode) |
3fc7e390 RS |
1623 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
1624 | ||
0afeef64 | 1625 | if (mode == HImode) |
3fc7e390 RS |
1626 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
1627 | ||
0afeef64 | 1628 | if (mode == SImode) |
3fc7e390 RS |
1629 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
1630 | ||
0afeef64 | 1631 | if (mode == DImode) |
3fc7e390 RS |
1632 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
1633 | ||
21a9616b | 1634 | #if HOST_BITS_PER_WIDE_INT >= 64 |
a6d7e156 JL |
1635 | if (mode == TYPE_MODE (intTI_type_node)) |
1636 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
21a9616b | 1637 | #endif |
a6d7e156 | 1638 | |
b30f223b RS |
1639 | if (mode == TYPE_MODE (float_type_node)) |
1640 | return float_type_node; | |
1641 | ||
1642 | if (mode == TYPE_MODE (double_type_node)) | |
1643 | return double_type_node; | |
1644 | ||
1645 | if (mode == TYPE_MODE (long_double_type_node)) | |
1646 | return long_double_type_node; | |
1647 | ||
ff42324e NS |
1648 | if (mode == TYPE_MODE (void_type_node)) |
1649 | return void_type_node; | |
9f63daea | 1650 | |
b30f223b | 1651 | if (mode == TYPE_MODE (build_pointer_type (char_type_node))) |
19b3ffbc DD |
1652 | return (unsignedp |
1653 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
1654 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b30f223b RS |
1655 | |
1656 | if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
19b3ffbc DD |
1657 | return (unsignedp |
1658 | ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
1659 | : make_signed_type (GET_MODE_PRECISION (mode))); | |
b30f223b | 1660 | |
7e7e470f RH |
1661 | if (COMPLEX_MODE_P (mode)) |
1662 | { | |
1663 | enum machine_mode inner_mode; | |
1664 | tree inner_type; | |
1665 | ||
1666 | if (mode == TYPE_MODE (complex_float_type_node)) | |
1667 | return complex_float_type_node; | |
1668 | if (mode == TYPE_MODE (complex_double_type_node)) | |
1669 | return complex_double_type_node; | |
1670 | if (mode == TYPE_MODE (complex_long_double_type_node)) | |
1671 | return complex_long_double_type_node; | |
1672 | ||
1673 | if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp) | |
1674 | return complex_integer_type_node; | |
1675 | ||
1676 | inner_mode = GET_MODE_INNER (mode); | |
1677 | inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1678 | if (inner_type != NULL_TREE) | |
1679 | return build_complex_type (inner_type); | |
1680 | } | |
1681 | else if (VECTOR_MODE_P (mode)) | |
4a5eab38 PB |
1682 | { |
1683 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
1684 | tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1685 | if (inner_type != NULL_TREE) | |
1686 | return build_vector_type_for_mode (inner_type, mode); | |
0afeef64 | 1687 | } |
4061f623 | 1688 | |
d1d3865f ZW |
1689 | for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
1690 | if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
1691 | return TREE_VALUE (t); | |
1692 | ||
b30f223b RS |
1693 | return 0; |
1694 | } | |
693a6128 | 1695 | |
ec5c56db | 1696 | /* Return an unsigned type the same as TYPE in other respects. */ |
693a6128 | 1697 | tree |
35b1a6fa | 1698 | c_common_unsigned_type (tree type) |
693a6128 GRK |
1699 | { |
1700 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1701 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1702 | return unsigned_char_type_node; | |
1703 | if (type1 == integer_type_node) | |
1704 | return unsigned_type_node; | |
1705 | if (type1 == short_integer_type_node) | |
1706 | return short_unsigned_type_node; | |
1707 | if (type1 == long_integer_type_node) | |
1708 | return long_unsigned_type_node; | |
1709 | if (type1 == long_long_integer_type_node) | |
1710 | return long_long_unsigned_type_node; | |
1711 | if (type1 == widest_integer_literal_type_node) | |
1712 | return widest_unsigned_literal_type_node; | |
1713 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1714 | if (type1 == intTI_type_node) | |
1715 | return unsigned_intTI_type_node; | |
1716 | #endif | |
1717 | if (type1 == intDI_type_node) | |
1718 | return unsigned_intDI_type_node; | |
1719 | if (type1 == intSI_type_node) | |
1720 | return unsigned_intSI_type_node; | |
1721 | if (type1 == intHI_type_node) | |
1722 | return unsigned_intHI_type_node; | |
1723 | if (type1 == intQI_type_node) | |
1724 | return unsigned_intQI_type_node; | |
1725 | ||
ceef8ce4 | 1726 | return c_common_signed_or_unsigned_type (1, type); |
693a6128 GRK |
1727 | } |
1728 | ||
1729 | /* Return a signed type the same as TYPE in other respects. */ | |
1730 | ||
1731 | tree | |
35b1a6fa | 1732 | c_common_signed_type (tree type) |
693a6128 GRK |
1733 | { |
1734 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1735 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1736 | return signed_char_type_node; | |
1737 | if (type1 == unsigned_type_node) | |
1738 | return integer_type_node; | |
1739 | if (type1 == short_unsigned_type_node) | |
1740 | return short_integer_type_node; | |
1741 | if (type1 == long_unsigned_type_node) | |
1742 | return long_integer_type_node; | |
1743 | if (type1 == long_long_unsigned_type_node) | |
1744 | return long_long_integer_type_node; | |
1745 | if (type1 == widest_unsigned_literal_type_node) | |
1746 | return widest_integer_literal_type_node; | |
1747 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1748 | if (type1 == unsigned_intTI_type_node) | |
1749 | return intTI_type_node; | |
1750 | #endif | |
1751 | if (type1 == unsigned_intDI_type_node) | |
1752 | return intDI_type_node; | |
1753 | if (type1 == unsigned_intSI_type_node) | |
1754 | return intSI_type_node; | |
1755 | if (type1 == unsigned_intHI_type_node) | |
1756 | return intHI_type_node; | |
1757 | if (type1 == unsigned_intQI_type_node) | |
1758 | return intQI_type_node; | |
1759 | ||
ceef8ce4 | 1760 | return c_common_signed_or_unsigned_type (0, type); |
693a6128 GRK |
1761 | } |
1762 | ||
1763 | /* Return a type the same as TYPE except unsigned or | |
1764 | signed according to UNSIGNEDP. */ | |
1765 | ||
1766 | tree | |
35b1a6fa | 1767 | c_common_signed_or_unsigned_type (int unsignedp, tree type) |
693a6128 | 1768 | { |
3f75a254 | 1769 | if (!INTEGRAL_TYPE_P (type) |
8df83eae | 1770 | || TYPE_UNSIGNED (type) == unsignedp) |
693a6128 GRK |
1771 | return type; |
1772 | ||
bc15d0ef JM |
1773 | /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not |
1774 | the precision; they have precision set to match their range, but | |
1775 | may use a wider mode to match an ABI. If we change modes, we may | |
1776 | wind up with bad conversions. For INTEGER_TYPEs in C, must check | |
1777 | the precision as well, so as to yield correct results for | |
1778 | bit-field types. C++ does not have these separate bit-field | |
1779 | types, and producing a signed or unsigned variant of an | |
1780 | ENUMERAL_TYPE may cause other problems as well. */ | |
1781 | ||
1782 | #define TYPE_OK(node) \ | |
1783 | (TYPE_MODE (type) == TYPE_MODE (node) \ | |
1784 | && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node))) | |
1785 | if (TYPE_OK (signed_char_type_node)) | |
693a6128 | 1786 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
bc15d0ef | 1787 | if (TYPE_OK (integer_type_node)) |
693a6128 | 1788 | return unsignedp ? unsigned_type_node : integer_type_node; |
bc15d0ef | 1789 | if (TYPE_OK (short_integer_type_node)) |
693a6128 | 1790 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
bc15d0ef | 1791 | if (TYPE_OK (long_integer_type_node)) |
693a6128 | 1792 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
bc15d0ef | 1793 | if (TYPE_OK (long_long_integer_type_node)) |
693a6128 GRK |
1794 | return (unsignedp ? long_long_unsigned_type_node |
1795 | : long_long_integer_type_node); | |
bc15d0ef | 1796 | if (TYPE_OK (widest_integer_literal_type_node)) |
693a6128 GRK |
1797 | return (unsignedp ? widest_unsigned_literal_type_node |
1798 | : widest_integer_literal_type_node); | |
4a063bec RH |
1799 | |
1800 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
bc15d0ef | 1801 | if (TYPE_OK (intTI_type_node)) |
4a063bec RH |
1802 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; |
1803 | #endif | |
bc15d0ef | 1804 | if (TYPE_OK (intDI_type_node)) |
4a063bec | 1805 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
bc15d0ef | 1806 | if (TYPE_OK (intSI_type_node)) |
4a063bec | 1807 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
bc15d0ef | 1808 | if (TYPE_OK (intHI_type_node)) |
4a063bec | 1809 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
bc15d0ef | 1810 | if (TYPE_OK (intQI_type_node)) |
4a063bec | 1811 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
bc15d0ef | 1812 | #undef TYPE_OK |
4a063bec | 1813 | |
bc15d0ef JM |
1814 | if (c_dialect_cxx ()) |
1815 | return type; | |
1816 | else | |
1817 | return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); | |
693a6128 | 1818 | } |
9649812a MM |
1819 | |
1820 | /* The C version of the register_builtin_type langhook. */ | |
1821 | ||
1822 | void | |
1823 | c_register_builtin_type (tree type, const char* name) | |
1824 | { | |
1825 | tree decl; | |
1826 | ||
1827 | decl = build_decl (TYPE_DECL, get_identifier (name), type); | |
1828 | DECL_ARTIFICIAL (decl) = 1; | |
1829 | if (!TYPE_NAME (type)) | |
1830 | TYPE_NAME (type) = decl; | |
1831 | pushdecl (decl); | |
d1d3865f ZW |
1832 | |
1833 | registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
9649812a MM |
1834 | } |
1835 | ||
b30f223b | 1836 | \f |
6acfe908 JM |
1837 | /* Return the minimum number of bits needed to represent VALUE in a |
1838 | signed or unsigned type, UNSIGNEDP says which. */ | |
1839 | ||
05bccae2 | 1840 | unsigned int |
35b1a6fa | 1841 | min_precision (tree value, int unsignedp) |
6acfe908 JM |
1842 | { |
1843 | int log; | |
1844 | ||
1845 | /* If the value is negative, compute its negative minus 1. The latter | |
1846 | adjustment is because the absolute value of the largest negative value | |
1847 | is one larger than the largest positive value. This is equivalent to | |
1848 | a bit-wise negation, so use that operation instead. */ | |
1849 | ||
1850 | if (tree_int_cst_sgn (value) < 0) | |
987b67bc | 1851 | value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value); |
6acfe908 JM |
1852 | |
1853 | /* Return the number of bits needed, taking into account the fact | |
1854 | that we need one more bit for a signed than unsigned type. */ | |
1855 | ||
1856 | if (integer_zerop (value)) | |
1857 | log = 0; | |
6acfe908 | 1858 | else |
05bccae2 | 1859 | log = tree_floor_log2 (value); |
6acfe908 | 1860 | |
3f75a254 | 1861 | return log + 1 + !unsignedp; |
6acfe908 JM |
1862 | } |
1863 | \f | |
78ef5b89 NB |
1864 | /* Print an error message for invalid operands to arith operation |
1865 | CODE. NOP_EXPR is used as a special case (see | |
1866 | c_common_truthvalue_conversion). */ | |
b30f223b RS |
1867 | |
1868 | void | |
35b1a6fa | 1869 | binary_op_error (enum tree_code code) |
b30f223b | 1870 | { |
b3694847 | 1871 | const char *opname; |
89c78d7d | 1872 | |
b30f223b RS |
1873 | switch (code) |
1874 | { | |
1875 | case NOP_EXPR: | |
1876 | error ("invalid truth-value expression"); | |
1877 | return; | |
1878 | ||
1879 | case PLUS_EXPR: | |
1880 | opname = "+"; break; | |
1881 | case MINUS_EXPR: | |
1882 | opname = "-"; break; | |
1883 | case MULT_EXPR: | |
1884 | opname = "*"; break; | |
1885 | case MAX_EXPR: | |
1886 | opname = "max"; break; | |
1887 | case MIN_EXPR: | |
1888 | opname = "min"; break; | |
1889 | case EQ_EXPR: | |
1890 | opname = "=="; break; | |
1891 | case NE_EXPR: | |
1892 | opname = "!="; break; | |
1893 | case LE_EXPR: | |
1894 | opname = "<="; break; | |
1895 | case GE_EXPR: | |
1896 | opname = ">="; break; | |
1897 | case LT_EXPR: | |
1898 | opname = "<"; break; | |
1899 | case GT_EXPR: | |
1900 | opname = ">"; break; | |
1901 | case LSHIFT_EXPR: | |
1902 | opname = "<<"; break; | |
1903 | case RSHIFT_EXPR: | |
1904 | opname = ">>"; break; | |
1905 | case TRUNC_MOD_EXPR: | |
047de90b | 1906 | case FLOOR_MOD_EXPR: |
b30f223b RS |
1907 | opname = "%"; break; |
1908 | case TRUNC_DIV_EXPR: | |
047de90b | 1909 | case FLOOR_DIV_EXPR: |
b30f223b RS |
1910 | opname = "/"; break; |
1911 | case BIT_AND_EXPR: | |
1912 | opname = "&"; break; | |
1913 | case BIT_IOR_EXPR: | |
1914 | opname = "|"; break; | |
1915 | case TRUTH_ANDIF_EXPR: | |
1916 | opname = "&&"; break; | |
1917 | case TRUTH_ORIF_EXPR: | |
1918 | opname = "||"; break; | |
1919 | case BIT_XOR_EXPR: | |
1920 | opname = "^"; break; | |
6d819282 | 1921 | default: |
37b2f290 | 1922 | gcc_unreachable (); |
b30f223b RS |
1923 | } |
1924 | error ("invalid operands to binary %s", opname); | |
1925 | } | |
1926 | \f | |
1927 | /* Subroutine of build_binary_op, used for comparison operations. | |
1928 | See if the operands have both been converted from subword integer types | |
1929 | and, if so, perhaps change them both back to their original type. | |
94dccd9d RS |
1930 | This function is also responsible for converting the two operands |
1931 | to the proper common type for comparison. | |
b30f223b RS |
1932 | |
1933 | The arguments of this function are all pointers to local variables | |
1934 | of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
1935 | RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
1936 | ||
1937 | If this function returns nonzero, it means that the comparison has | |
1938 | a constant value. What this function returns is an expression for | |
1939 | that value. */ | |
1940 | ||
1941 | tree | |
35b1a6fa AJ |
1942 | shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, |
1943 | enum tree_code *rescode_ptr) | |
b30f223b | 1944 | { |
b3694847 | 1945 | tree type; |
b30f223b RS |
1946 | tree op0 = *op0_ptr; |
1947 | tree op1 = *op1_ptr; | |
1948 | int unsignedp0, unsignedp1; | |
1949 | int real1, real2; | |
1950 | tree primop0, primop1; | |
1951 | enum tree_code code = *rescode_ptr; | |
1952 | ||
1953 | /* Throw away any conversions to wider types | |
1954 | already present in the operands. */ | |
1955 | ||
1956 | primop0 = get_narrower (op0, &unsignedp0); | |
1957 | primop1 = get_narrower (op1, &unsignedp1); | |
1958 | ||
1959 | /* Handle the case that OP0 does not *contain* a conversion | |
1960 | but it *requires* conversion to FINAL_TYPE. */ | |
1961 | ||
1962 | if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
8df83eae | 1963 | unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
b30f223b | 1964 | if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) |
8df83eae | 1965 | unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
b30f223b RS |
1966 | |
1967 | /* If one of the operands must be floated, we cannot optimize. */ | |
1968 | real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
1969 | real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
1970 | ||
1971 | /* If first arg is constant, swap the args (changing operation | |
5af6001b RK |
1972 | so value is preserved), for canonicalization. Don't do this if |
1973 | the second arg is 0. */ | |
b30f223b | 1974 | |
5af6001b | 1975 | if (TREE_CONSTANT (primop0) |
3f75a254 | 1976 | && !integer_zerop (primop1) && !real_zerop (primop1)) |
b30f223b | 1977 | { |
b3694847 SS |
1978 | tree tem = primop0; |
1979 | int temi = unsignedp0; | |
b30f223b RS |
1980 | primop0 = primop1; |
1981 | primop1 = tem; | |
1982 | tem = op0; | |
1983 | op0 = op1; | |
1984 | op1 = tem; | |
1985 | *op0_ptr = op0; | |
1986 | *op1_ptr = op1; | |
1987 | unsignedp0 = unsignedp1; | |
1988 | unsignedp1 = temi; | |
1989 | temi = real1; | |
1990 | real1 = real2; | |
1991 | real2 = temi; | |
1992 | ||
1993 | switch (code) | |
1994 | { | |
1995 | case LT_EXPR: | |
1996 | code = GT_EXPR; | |
1997 | break; | |
1998 | case GT_EXPR: | |
1999 | code = LT_EXPR; | |
2000 | break; | |
2001 | case LE_EXPR: | |
2002 | code = GE_EXPR; | |
2003 | break; | |
2004 | case GE_EXPR: | |
2005 | code = LE_EXPR; | |
2006 | break; | |
6d819282 MK |
2007 | default: |
2008 | break; | |
b30f223b RS |
2009 | } |
2010 | *rescode_ptr = code; | |
2011 | } | |
2012 | ||
2013 | /* If comparing an integer against a constant more bits wide, | |
2014 | maybe we can deduce a value of 1 or 0 independent of the data. | |
2015 | Or else truncate the constant now | |
2016 | rather than extend the variable at run time. | |
2017 | ||
2018 | This is only interesting if the constant is the wider arg. | |
2019 | Also, it is not safe if the constant is unsigned and the | |
2020 | variable arg is signed, since in this case the variable | |
2021 | would be sign-extended and then regarded as unsigned. | |
2022 | Our technique fails in this case because the lowest/highest | |
2023 | possible unsigned results don't follow naturally from the | |
2024 | lowest/highest possible values of the variable operand. | |
2025 | For just EQ_EXPR and NE_EXPR there is another technique that | |
2026 | could be used: see if the constant can be faithfully represented | |
2027 | in the other operand's type, by truncating it and reextending it | |
2028 | and see if that preserves the constant's value. */ | |
2029 | ||
2030 | if (!real1 && !real2 | |
2031 | && TREE_CODE (primop1) == INTEGER_CST | |
2032 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
2033 | { | |
2034 | int min_gt, max_gt, min_lt, max_lt; | |
2035 | tree maxval, minval; | |
2036 | /* 1 if comparison is nominally unsigned. */ | |
8df83eae | 2037 | int unsignedp = TYPE_UNSIGNED (*restype_ptr); |
b30f223b RS |
2038 | tree val; |
2039 | ||
ceef8ce4 NB |
2040 | type = c_common_signed_or_unsigned_type (unsignedp0, |
2041 | TREE_TYPE (primop0)); | |
8bbd5685 | 2042 | |
b30f223b RS |
2043 | maxval = TYPE_MAX_VALUE (type); |
2044 | minval = TYPE_MIN_VALUE (type); | |
2045 | ||
2046 | if (unsignedp && !unsignedp0) | |
ceef8ce4 | 2047 | *restype_ptr = c_common_signed_type (*restype_ptr); |
b30f223b RS |
2048 | |
2049 | if (TREE_TYPE (primop1) != *restype_ptr) | |
fae1b38d | 2050 | { |
af9c6659 NS |
2051 | /* Convert primop1 to target type, but do not introduce |
2052 | additional overflow. We know primop1 is an int_cst. */ | |
7d60be94 NS |
2053 | tree tmp = build_int_cst_wide (*restype_ptr, |
2054 | TREE_INT_CST_LOW (primop1), | |
2055 | TREE_INT_CST_HIGH (primop1)); | |
af9c6659 | 2056 | |
af9c6659 NS |
2057 | primop1 = force_fit_type (tmp, 0, TREE_OVERFLOW (primop1), |
2058 | TREE_CONSTANT_OVERFLOW (primop1)); | |
fae1b38d | 2059 | } |
b30f223b RS |
2060 | if (type != *restype_ptr) |
2061 | { | |
2062 | minval = convert (*restype_ptr, minval); | |
2063 | maxval = convert (*restype_ptr, maxval); | |
2064 | } | |
2065 | ||
2066 | if (unsignedp && unsignedp0) | |
2067 | { | |
2068 | min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
2069 | max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
2070 | min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
2071 | max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
2072 | } | |
2073 | else | |
2074 | { | |
2075 | min_gt = INT_CST_LT (primop1, minval); | |
2076 | max_gt = INT_CST_LT (primop1, maxval); | |
2077 | min_lt = INT_CST_LT (minval, primop1); | |
2078 | max_lt = INT_CST_LT (maxval, primop1); | |
2079 | } | |
2080 | ||
2081 | val = 0; | |
2082 | /* This used to be a switch, but Genix compiler can't handle that. */ | |
2083 | if (code == NE_EXPR) | |
2084 | { | |
2085 | if (max_lt || min_gt) | |
de7df9eb | 2086 | val = truthvalue_true_node; |
b30f223b RS |
2087 | } |
2088 | else if (code == EQ_EXPR) | |
2089 | { | |
2090 | if (max_lt || min_gt) | |
de7df9eb | 2091 | val = truthvalue_false_node; |
b30f223b RS |
2092 | } |
2093 | else if (code == LT_EXPR) | |
2094 | { | |
2095 | if (max_lt) | |
de7df9eb | 2096 | val = truthvalue_true_node; |
b30f223b | 2097 | if (!min_lt) |
de7df9eb | 2098 | val = truthvalue_false_node; |
b30f223b RS |
2099 | } |
2100 | else if (code == GT_EXPR) | |
2101 | { | |
2102 | if (min_gt) | |
de7df9eb | 2103 | val = truthvalue_true_node; |
b30f223b | 2104 | if (!max_gt) |
de7df9eb | 2105 | val = truthvalue_false_node; |
b30f223b RS |
2106 | } |
2107 | else if (code == LE_EXPR) | |
2108 | { | |
2109 | if (!max_gt) | |
de7df9eb | 2110 | val = truthvalue_true_node; |
b30f223b | 2111 | if (min_gt) |
de7df9eb | 2112 | val = truthvalue_false_node; |
b30f223b RS |
2113 | } |
2114 | else if (code == GE_EXPR) | |
2115 | { | |
2116 | if (!min_lt) | |
de7df9eb | 2117 | val = truthvalue_true_node; |
b30f223b | 2118 | if (max_lt) |
de7df9eb | 2119 | val = truthvalue_false_node; |
b30f223b RS |
2120 | } |
2121 | ||
2122 | /* If primop0 was sign-extended and unsigned comparison specd, | |
2123 | we did a signed comparison above using the signed type bounds. | |
2124 | But the comparison we output must be unsigned. | |
2125 | ||
2126 | Also, for inequalities, VAL is no good; but if the signed | |
2127 | comparison had *any* fixed result, it follows that the | |
2128 | unsigned comparison just tests the sign in reverse | |
2129 | (positive values are LE, negative ones GE). | |
2130 | So we can generate an unsigned comparison | |
2131 | against an extreme value of the signed type. */ | |
2132 | ||
2133 | if (unsignedp && !unsignedp0) | |
2134 | { | |
2135 | if (val != 0) | |
2136 | switch (code) | |
2137 | { | |
2138 | case LT_EXPR: | |
2139 | case GE_EXPR: | |
2140 | primop1 = TYPE_MIN_VALUE (type); | |
2141 | val = 0; | |
2142 | break; | |
2143 | ||
2144 | case LE_EXPR: | |
2145 | case GT_EXPR: | |
2146 | primop1 = TYPE_MAX_VALUE (type); | |
2147 | val = 0; | |
2148 | break; | |
6d819282 MK |
2149 | |
2150 | default: | |
2151 | break; | |
b30f223b | 2152 | } |
ceef8ce4 | 2153 | type = c_common_unsigned_type (type); |
b30f223b RS |
2154 | } |
2155 | ||
5c5b2283 | 2156 | if (TREE_CODE (primop0) != INTEGER_CST) |
b30f223b | 2157 | { |
de7df9eb | 2158 | if (val == truthvalue_false_node) |
d4ee4d25 | 2159 | warning (0, "comparison is always false due to limited range of data type"); |
de7df9eb | 2160 | if (val == truthvalue_true_node) |
d4ee4d25 | 2161 | warning (0, "comparison is always true due to limited range of data type"); |
b30f223b RS |
2162 | } |
2163 | ||
2164 | if (val != 0) | |
2165 | { | |
2166 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2167 | if (TREE_SIDE_EFFECTS (primop0)) | |
53fb4de3 | 2168 | return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); |
b30f223b RS |
2169 | return val; |
2170 | } | |
2171 | ||
2172 | /* Value is not predetermined, but do the comparison | |
2173 | in the type of the operand that is not constant. | |
2174 | TYPE is already properly set. */ | |
2175 | } | |
2176 | else if (real1 && real2 | |
766f6c30 RS |
2177 | && (TYPE_PRECISION (TREE_TYPE (primop0)) |
2178 | == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
b30f223b RS |
2179 | type = TREE_TYPE (primop0); |
2180 | ||
2181 | /* If args' natural types are both narrower than nominal type | |
2182 | and both extend in the same manner, compare them | |
2183 | in the type of the wider arg. | |
2184 | Otherwise must actually extend both to the nominal | |
2185 | common type lest different ways of extending | |
2186 | alter the result. | |
2187 | (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
2188 | ||
2189 | else if (unsignedp0 == unsignedp1 && real1 == real2 | |
2190 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
2191 | && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
2192 | { | |
2193 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
ceef8ce4 | 2194 | type = c_common_signed_or_unsigned_type (unsignedp0 |
8df83eae | 2195 | || TYPE_UNSIGNED (*restype_ptr), |
ceef8ce4 | 2196 | type); |
b30f223b RS |
2197 | /* Make sure shorter operand is extended the right way |
2198 | to match the longer operand. */ | |
ceef8ce4 NB |
2199 | primop0 |
2200 | = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
2201 | TREE_TYPE (primop0)), | |
2202 | primop0); | |
2203 | primop1 | |
2204 | = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
2205 | TREE_TYPE (primop1)), | |
2206 | primop1); | |
b30f223b RS |
2207 | } |
2208 | else | |
2209 | { | |
2210 | /* Here we must do the comparison on the nominal type | |
2211 | using the args exactly as we received them. */ | |
2212 | type = *restype_ptr; | |
2213 | primop0 = op0; | |
2214 | primop1 = op1; | |
2215 | ||
2216 | if (!real1 && !real2 && integer_zerop (primop1) | |
8df83eae | 2217 | && TYPE_UNSIGNED (*restype_ptr)) |
b30f223b RS |
2218 | { |
2219 | tree value = 0; | |
2220 | switch (code) | |
2221 | { | |
2222 | case GE_EXPR: | |
5af6001b RK |
2223 | /* All unsigned values are >= 0, so we warn if extra warnings |
2224 | are requested. However, if OP0 is a constant that is | |
2225 | >= 0, the signedness of the comparison isn't an issue, | |
2226 | so suppress the warning. */ | |
2c492eef | 2227 | if (extra_warnings && !in_system_header |
3f75a254 JM |
2228 | && !(TREE_CODE (primop0) == INTEGER_CST |
2229 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
2230 | primop0)))) | |
d4ee4d25 | 2231 | warning (0, "comparison of unsigned expression >= 0 is always true"); |
de7df9eb | 2232 | value = truthvalue_true_node; |
b30f223b RS |
2233 | break; |
2234 | ||
2235 | case LT_EXPR: | |
2c492eef | 2236 | if (extra_warnings && !in_system_header |
3f75a254 JM |
2237 | && !(TREE_CODE (primop0) == INTEGER_CST |
2238 | && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
2239 | primop0)))) | |
d4ee4d25 | 2240 | warning (0, "comparison of unsigned expression < 0 is always false"); |
de7df9eb | 2241 | value = truthvalue_false_node; |
6d819282 MK |
2242 | break; |
2243 | ||
2244 | default: | |
2245 | break; | |
b30f223b RS |
2246 | } |
2247 | ||
2248 | if (value != 0) | |
2249 | { | |
2250 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2251 | if (TREE_SIDE_EFFECTS (primop0)) | |
53fb4de3 RS |
2252 | return build2 (COMPOUND_EXPR, TREE_TYPE (value), |
2253 | primop0, value); | |
b30f223b RS |
2254 | return value; |
2255 | } | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | *op0_ptr = convert (type, primop0); | |
2260 | *op1_ptr = convert (type, primop1); | |
2261 | ||
de7df9eb | 2262 | *restype_ptr = truthvalue_type_node; |
b30f223b RS |
2263 | |
2264 | return 0; | |
2265 | } | |
2266 | \f | |
7552da58 JJ |
2267 | /* Return a tree for the sum or difference (RESULTCODE says which) |
2268 | of pointer PTROP and integer INTOP. */ | |
2269 | ||
2270 | tree | |
35b1a6fa | 2271 | pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop) |
7552da58 JJ |
2272 | { |
2273 | tree size_exp; | |
2274 | ||
7552da58 JJ |
2275 | /* The result is a pointer of the same type that is being added. */ |
2276 | ||
2277 | tree result_type = TREE_TYPE (ptrop); | |
2278 | ||
2279 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2280 | { | |
2281 | if (pedantic || warn_pointer_arith) | |
bda67431 | 2282 | pedwarn ("pointer of type %<void *%> used in arithmetic"); |
7552da58 JJ |
2283 | size_exp = integer_one_node; |
2284 | } | |
2285 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2286 | { | |
2287 | if (pedantic || warn_pointer_arith) | |
2288 | pedwarn ("pointer to a function used in arithmetic"); | |
2289 | size_exp = integer_one_node; | |
2290 | } | |
2291 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
2292 | { | |
2293 | if (pedantic || warn_pointer_arith) | |
2294 | pedwarn ("pointer to member function used in arithmetic"); | |
2295 | size_exp = integer_one_node; | |
2296 | } | |
7552da58 JJ |
2297 | else |
2298 | size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
2299 | ||
2300 | /* If what we are about to multiply by the size of the elements | |
2301 | contains a constant term, apply distributive law | |
2302 | and multiply that constant term separately. | |
2303 | This helps produce common subexpressions. */ | |
2304 | ||
2305 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
3f75a254 | 2306 | && !TREE_CONSTANT (intop) |
7552da58 JJ |
2307 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) |
2308 | && TREE_CONSTANT (size_exp) | |
2309 | /* If the constant comes from pointer subtraction, | |
2310 | skip this optimization--it would cause an error. */ | |
2311 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
2312 | /* If the constant is unsigned, and smaller than the pointer size, | |
2313 | then we must skip this optimization. This is because it could cause | |
2314 | an overflow error if the constant is negative but INTOP is not. */ | |
3f75a254 | 2315 | && (!TYPE_UNSIGNED (TREE_TYPE (intop)) |
7552da58 JJ |
2316 | || (TYPE_PRECISION (TREE_TYPE (intop)) |
2317 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
2318 | { | |
2319 | enum tree_code subcode = resultcode; | |
2320 | tree int_type = TREE_TYPE (intop); | |
2321 | if (TREE_CODE (intop) == MINUS_EXPR) | |
2322 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
2323 | /* Convert both subexpression types to the type of intop, | |
2324 | because weird cases involving pointer arithmetic | |
2325 | can result in a sum or difference with different type args. */ | |
2326 | ptrop = build_binary_op (subcode, ptrop, | |
2327 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2328 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
2329 | } | |
2330 | ||
2331 | /* Convert the integer argument to a type the same size as sizetype | |
2332 | so the multiply won't overflow spuriously. */ | |
2333 | ||
2334 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) | |
8df83eae | 2335 | || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) |
35b1a6fa | 2336 | intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), |
8df83eae | 2337 | TYPE_UNSIGNED (sizetype)), intop); |
7552da58 JJ |
2338 | |
2339 | /* Replace the integer argument with a suitable product by the object size. | |
2340 | Do this multiplication as signed, then convert to the appropriate | |
2341 | pointer type (actually unsigned integral). */ | |
2342 | ||
2343 | intop = convert (result_type, | |
2344 | build_binary_op (MULT_EXPR, intop, | |
2345 | convert (TREE_TYPE (intop), size_exp), 1)); | |
2346 | ||
2347 | /* Create the sum or difference. */ | |
987b67bc | 2348 | return fold_build2 (resultcode, result_type, ptrop, intop); |
7552da58 JJ |
2349 | } |
2350 | \f | |
b30f223b | 2351 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
85498824 JM |
2352 | or for an `if' or `while' statement or ?..: exp. It should already |
2353 | have been validated to be of suitable type; otherwise, a bad | |
2354 | diagnostic may result. | |
b30f223b RS |
2355 | |
2356 | This preparation consists of taking the ordinary | |
2357 | representation of an expression expr and producing a valid tree | |
2358 | boolean expression describing whether expr is nonzero. We could | |
de7df9eb | 2359 | simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), |
b30f223b RS |
2360 | but we optimize comparisons, &&, ||, and !. |
2361 | ||
de7df9eb | 2362 | The resulting type should always be `truthvalue_type_node'. */ |
b30f223b RS |
2363 | |
2364 | tree | |
35b1a6fa | 2365 | c_common_truthvalue_conversion (tree expr) |
b30f223b | 2366 | { |
b30f223b RS |
2367 | switch (TREE_CODE (expr)) |
2368 | { | |
d1a7edaf | 2369 | case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR: |
6f312d18 ZW |
2370 | case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: |
2371 | case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR: | |
2372 | case ORDERED_EXPR: case UNORDERED_EXPR: | |
90ec750d RS |
2373 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2374 | return expr; | |
2375 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
2376 | TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1)); | |
2377 | ||
b30f223b RS |
2378 | case TRUTH_ANDIF_EXPR: |
2379 | case TRUTH_ORIF_EXPR: | |
2380 | case TRUTH_AND_EXPR: | |
2381 | case TRUTH_OR_EXPR: | |
9379fac9 | 2382 | case TRUTH_XOR_EXPR: |
90ec750d RS |
2383 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2384 | return expr; | |
2385 | return build2 (TREE_CODE (expr), truthvalue_type_node, | |
85498824 JM |
2386 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2387 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1))); | |
18c0f675 | 2388 | |
18d00205 | 2389 | case TRUTH_NOT_EXPR: |
90ec750d RS |
2390 | if (TREE_TYPE (expr) == truthvalue_type_node) |
2391 | return expr; | |
2392 | return build1 (TREE_CODE (expr), truthvalue_type_node, | |
85498824 | 2393 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0))); |
18d00205 | 2394 | |
b30f223b RS |
2395 | case ERROR_MARK: |
2396 | return expr; | |
2397 | ||
2398 | case INTEGER_CST: | |
010c4d9c RS |
2399 | /* Avoid integer_zerop to ignore TREE_CONSTANT_OVERFLOW. */ |
2400 | return (TREE_INT_CST_LOW (expr) != 0 || TREE_INT_CST_HIGH (expr) != 0) | |
2401 | ? truthvalue_true_node | |
2402 | : truthvalue_false_node; | |
b30f223b RS |
2403 | |
2404 | case REAL_CST: | |
010c4d9c RS |
2405 | return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0) |
2406 | ? truthvalue_true_node | |
2407 | : truthvalue_false_node; | |
b30f223b | 2408 | |
90ec750d RS |
2409 | case FUNCTION_DECL: |
2410 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
2411 | /* Fall through. */ | |
2412 | ||
b30f223b | 2413 | case ADDR_EXPR: |
1998463c SB |
2414 | { |
2415 | if (TREE_CODE (TREE_OPERAND (expr, 0)) == FUNCTION_DECL | |
3f75a254 | 2416 | && !DECL_WEAK (TREE_OPERAND (expr, 0))) |
1998463c SB |
2417 | { |
2418 | /* Common Ada/Pascal programmer's mistake. We always warn | |
2419 | about this since it is so bad. */ | |
d4ee4d25 | 2420 | warning (0, "the address of %qD, will always evaluate as %<true%>", |
1998463c SB |
2421 | TREE_OPERAND (expr, 0)); |
2422 | return truthvalue_true_node; | |
2423 | } | |
fc0c675f | 2424 | |
1998463c SB |
2425 | /* If we are taking the address of an external decl, it might be |
2426 | zero if it is weak, so we cannot optimize. */ | |
2427 | if (DECL_P (TREE_OPERAND (expr, 0)) | |
2428 | && DECL_EXTERNAL (TREE_OPERAND (expr, 0))) | |
2429 | break; | |
2430 | ||
2431 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0))) | |
53fb4de3 RS |
2432 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
2433 | TREE_OPERAND (expr, 0), truthvalue_true_node); | |
1998463c SB |
2434 | else |
2435 | return truthvalue_true_node; | |
2436 | } | |
b30f223b | 2437 | |
766f6c30 | 2438 | case COMPLEX_EXPR: |
f0b996c5 | 2439 | return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) |
b839fb3f | 2440 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
85498824 JM |
2441 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2442 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1)), | |
766f6c30 RS |
2443 | 0); |
2444 | ||
b30f223b RS |
2445 | case NEGATE_EXPR: |
2446 | case ABS_EXPR: | |
2447 | case FLOAT_EXPR: | |
da7d8304 | 2448 | /* These don't change whether an object is nonzero or zero. */ |
85498824 | 2449 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b30f223b RS |
2450 | |
2451 | case LROTATE_EXPR: | |
2452 | case RROTATE_EXPR: | |
da7d8304 | 2453 | /* These don't change whether an object is zero or nonzero, but |
b30f223b RS |
2454 | we can't ignore them if their second arg has side-effects. */ |
2455 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
53fb4de3 RS |
2456 | return build2 (COMPOUND_EXPR, truthvalue_type_node, |
2457 | TREE_OPERAND (expr, 1), | |
85498824 | 2458 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 0))); |
b30f223b | 2459 | else |
85498824 | 2460 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b57062ca | 2461 | |
b30f223b RS |
2462 | case COND_EXPR: |
2463 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
987b67bc | 2464 | return fold_build3 (COND_EXPR, truthvalue_type_node, |
53fb4de3 | 2465 | TREE_OPERAND (expr, 0), |
85498824 | 2466 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 1)), |
987b67bc | 2467 | c_common_truthvalue_conversion (TREE_OPERAND (expr, 2))); |
b30f223b RS |
2468 | |
2469 | case CONVERT_EXPR: | |
2470 | /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, | |
2471 | since that affects how `default_conversion' will behave. */ | |
2472 | if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
2473 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
2474 | break; | |
938d968e | 2475 | /* Fall through.... */ |
b30f223b RS |
2476 | case NOP_EXPR: |
2477 | /* If this is widening the argument, we can ignore it. */ | |
2478 | if (TYPE_PRECISION (TREE_TYPE (expr)) | |
2479 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
85498824 | 2480 | return c_common_truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b30f223b RS |
2481 | break; |
2482 | ||
b30f223b | 2483 | case MINUS_EXPR: |
71925bc0 RS |
2484 | /* Perhaps reduce (x - y) != 0 to (x != y). The expressions |
2485 | aren't guaranteed to the be same for modes that can represent | |
2486 | infinity, since if x and y are both +infinity, or both | |
2487 | -infinity, then x - y is not a number. | |
2488 | ||
2489 | Note that this transformation is safe when x or y is NaN. | |
2490 | (x - y) is then NaN, and both (x - y) != 0 and x != y will | |
2491 | be false. */ | |
2492 | if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))) | |
f87550e0 | 2493 | break; |
938d968e | 2494 | /* Fall through.... */ |
f87550e0 | 2495 | case BIT_XOR_EXPR: |
d7c83727 | 2496 | /* This and MINUS_EXPR can be changed into a comparison of the |
f87550e0 | 2497 | two objects. */ |
b30f223b RS |
2498 | if (TREE_TYPE (TREE_OPERAND (expr, 0)) |
2499 | == TREE_TYPE (TREE_OPERAND (expr, 1))) | |
cb3b1e70 RS |
2500 | return fold_build2 (NE_EXPR, truthvalue_type_node, |
2501 | TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1)); | |
2502 | return fold_build2 (NE_EXPR, truthvalue_type_node, | |
2503 | TREE_OPERAND (expr, 0), | |
2504 | fold_convert (TREE_TYPE (TREE_OPERAND (expr, 0)), | |
2505 | TREE_OPERAND (expr, 1))); | |
e2aab13d | 2506 | |
fb48b1f0 | 2507 | case BIT_AND_EXPR: |
58cee643 | 2508 | if (integer_onep (TREE_OPERAND (expr, 1)) |
de7df9eb | 2509 | && TREE_TYPE (expr) != truthvalue_type_node) |
58cee643 | 2510 | /* Using convert here would cause infinite recursion. */ |
de7df9eb | 2511 | return build1 (NOP_EXPR, truthvalue_type_node, expr); |
58cee643 | 2512 | break; |
fb48b1f0 | 2513 | |
e2aab13d | 2514 | case MODIFY_EXPR: |
44c21c7f DD |
2515 | if (!TREE_NO_WARNING (expr)) |
2516 | warning (OPT_Wparentheses, | |
2517 | "suggest parentheses around assignment used as truth value"); | |
e2aab13d | 2518 | break; |
b57062ca | 2519 | |
6d819282 MK |
2520 | default: |
2521 | break; | |
b30f223b RS |
2522 | } |
2523 | ||
f0b996c5 | 2524 | if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) |
f0b8d9aa | 2525 | { |
78ef5b89 | 2526 | tree t = save_expr (expr); |
f0b8d9aa AS |
2527 | return (build_binary_op |
2528 | ((TREE_SIDE_EFFECTS (expr) | |
2529 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
85498824 JM |
2530 | c_common_truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)), |
2531 | c_common_truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)), | |
f0b8d9aa AS |
2532 | 0)); |
2533 | } | |
f0b996c5 | 2534 | |
b30f223b RS |
2535 | return build_binary_op (NE_EXPR, expr, integer_zero_node, 1); |
2536 | } | |
2537 | \f | |
9bc15050 RG |
2538 | static void def_builtin_1 (enum built_in_function fncode, |
2539 | const char *name, | |
2540 | enum built_in_class fnclass, | |
2541 | tree fntype, tree libtype, | |
2542 | bool both_p, bool fallback_p, bool nonansi_p, | |
2543 | tree fnattrs, bool implicit_p); | |
fc2aaf30 | 2544 | |
0b73773c NH |
2545 | /* Make a variant type in the proper way for C/C++, propagating qualifiers |
2546 | down to the element type of an array. */ | |
2547 | ||
2548 | tree | |
35b1a6fa | 2549 | c_build_qualified_type (tree type, int type_quals) |
0b73773c | 2550 | { |
5a6159dd AP |
2551 | if (type == error_mark_node) |
2552 | return type; | |
9f63daea | 2553 | |
4b011bbf | 2554 | if (TREE_CODE (type) == ARRAY_TYPE) |
46df2823 JM |
2555 | { |
2556 | tree t; | |
2557 | tree element_type = c_build_qualified_type (TREE_TYPE (type), | |
2558 | type_quals); | |
2559 | ||
2560 | /* See if we already have an identically qualified type. */ | |
2561 | for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) | |
2562 | { | |
2563 | if (TYPE_QUALS (strip_array_types (t)) == type_quals | |
2564 | && TYPE_NAME (t) == TYPE_NAME (type) | |
2565 | && TYPE_CONTEXT (t) == TYPE_CONTEXT (type) | |
2566 | && attribute_list_equal (TYPE_ATTRIBUTES (t), | |
2567 | TYPE_ATTRIBUTES (type))) | |
2568 | break; | |
2569 | } | |
2570 | if (!t) | |
2571 | { | |
2572 | t = build_variant_type_copy (type); | |
2573 | TREE_TYPE (t) = element_type; | |
2574 | } | |
2575 | return t; | |
2576 | } | |
4b011bbf | 2577 | |
3932261a MM |
2578 | /* A restrict-qualified pointer type must be a pointer to object or |
2579 | incomplete type. Note that the use of POINTER_TYPE_P also allows | |
4b011bbf | 2580 | REFERENCE_TYPEs, which is appropriate for C++. */ |
3932261a MM |
2581 | if ((type_quals & TYPE_QUAL_RESTRICT) |
2582 | && (!POINTER_TYPE_P (type) | |
2583 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
2584 | { | |
bda67431 | 2585 | error ("invalid use of %<restrict%>"); |
3932261a MM |
2586 | type_quals &= ~TYPE_QUAL_RESTRICT; |
2587 | } | |
2588 | ||
3932261a MM |
2589 | return build_qualified_type (type, type_quals); |
2590 | } | |
2591 | ||
2592 | /* Apply the TYPE_QUALS to the new DECL. */ | |
2593 | ||
2594 | void | |
35b1a6fa | 2595 | c_apply_type_quals_to_decl (int type_quals, tree decl) |
3932261a | 2596 | { |
4b011bbf | 2597 | tree type = TREE_TYPE (decl); |
9f63daea | 2598 | |
5a6159dd AP |
2599 | if (type == error_mark_node) |
2600 | return; | |
4b011bbf JM |
2601 | |
2602 | if (((type_quals & TYPE_QUAL_CONST) | |
2603 | || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
2604 | /* An object declared 'const' is only readonly after it is | |
2605 | initialized. We don't have any way of expressing this currently, | |
2606 | so we need to be conservative and unset TREE_READONLY for types | |
2607 | with constructors. Otherwise aliasing code will ignore stores in | |
2608 | an inline constructor. */ | |
2609 | && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
3932261a MM |
2610 | TREE_READONLY (decl) = 1; |
2611 | if (type_quals & TYPE_QUAL_VOLATILE) | |
2612 | { | |
2613 | TREE_SIDE_EFFECTS (decl) = 1; | |
2614 | TREE_THIS_VOLATILE (decl) = 1; | |
2615 | } | |
6946bc60 | 2616 | if (type_quals & TYPE_QUAL_RESTRICT) |
3932261a | 2617 | { |
4b011bbf JM |
2618 | while (type && TREE_CODE (type) == ARRAY_TYPE) |
2619 | /* Allow 'restrict' on arrays of pointers. | |
2620 | FIXME currently we just ignore it. */ | |
2621 | type = TREE_TYPE (type); | |
2622 | if (!type | |
2623 | || !POINTER_TYPE_P (type) | |
2624 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
bda67431 | 2625 | error ("invalid use of %<restrict%>"); |
4b011bbf | 2626 | else if (flag_strict_aliasing && type == TREE_TYPE (decl)) |
3c5ad1ff RK |
2627 | /* Indicate we need to make a unique alias set for this pointer. |
2628 | We can't do it here because it might be pointing to an | |
2629 | incomplete type. */ | |
2630 | DECL_POINTER_ALIAS_SET (decl) = -2; | |
3932261a MM |
2631 | } |
2632 | } | |
2633 | ||
6de9cd9a DN |
2634 | /* Hash function for the problem of multiple type definitions in |
2635 | different files. This must hash all types that will compare | |
2636 | equal via comptypes to the same value. In practice it hashes | |
9cf737f8 | 2637 | on some of the simple stuff and leaves the details to comptypes. */ |
6de9cd9a DN |
2638 | |
2639 | static hashval_t | |
2640 | c_type_hash (const void *p) | |
2641 | { | |
2642 | int i = 0; | |
2643 | int shift, size; | |
3f75a254 | 2644 | tree t = (tree) p; |
6de9cd9a DN |
2645 | tree t2; |
2646 | switch (TREE_CODE (t)) | |
2647 | { | |
8c27b7d4 | 2648 | /* For pointers, hash on pointee type plus some swizzling. */ |
325c3691 RH |
2649 | case POINTER_TYPE: |
2650 | return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
2651 | /* Hash on number of elements and total size. */ | |
2652 | case ENUMERAL_TYPE: | |
2653 | shift = 3; | |
2654 | t2 = TYPE_VALUES (t); | |
2655 | break; | |
2656 | case RECORD_TYPE: | |
2657 | shift = 0; | |
2658 | t2 = TYPE_FIELDS (t); | |
2659 | break; | |
2660 | case QUAL_UNION_TYPE: | |
2661 | shift = 1; | |
2662 | t2 = TYPE_FIELDS (t); | |
2663 | break; | |
2664 | case UNION_TYPE: | |
2665 | shift = 2; | |
2666 | t2 = TYPE_FIELDS (t); | |
2667 | break; | |
2668 | default: | |
366de0ce | 2669 | gcc_unreachable (); |
6de9cd9a DN |
2670 | } |
2671 | for (; t2; t2 = TREE_CHAIN (t2)) | |
2672 | i++; | |
2673 | size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
2674 | return ((size << 24) | (i << shift)); | |
2675 | } | |
2676 | ||
4fe52ce9 DJ |
2677 | static GTY((param_is (union tree_node))) htab_t type_hash_table; |
2678 | ||
41472af8 | 2679 | /* Return the typed-based alias set for T, which may be an expression |
3bdf5ad1 | 2680 | or a type. Return -1 if we don't do anything special. */ |
41472af8 | 2681 | |
3bdf5ad1 | 2682 | HOST_WIDE_INT |
35b1a6fa | 2683 | c_common_get_alias_set (tree t) |
41472af8 | 2684 | { |
08bc2431 | 2685 | tree u; |
6de9cd9a | 2686 | PTR *slot; |
35b1a6fa | 2687 | |
08bc2431 MM |
2688 | /* Permit type-punning when accessing a union, provided the access |
2689 | is directly through the union. For example, this code does not | |
2690 | permit taking the address of a union member and then storing | |
2691 | through it. Even the type-punning allowed here is a GCC | |
2692 | extension, albeit a common and useful one; the C standard says | |
2693 | that such accesses have implementation-defined behavior. */ | |
2694 | for (u = t; | |
2695 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
2696 | u = TREE_OPERAND (u, 0)) | |
2697 | if (TREE_CODE (u) == COMPONENT_REF | |
2698 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
2699 | return 0; | |
ece32014 | 2700 | |
74d86f4f | 2701 | /* That's all the expressions we handle specially. */ |
3f75a254 | 2702 | if (!TYPE_P (t)) |
74d86f4f RH |
2703 | return -1; |
2704 | ||
95bd1dd7 | 2705 | /* The C standard guarantees that any object may be accessed via an |
74d86f4f RH |
2706 | lvalue that has character type. */ |
2707 | if (t == char_type_node | |
2708 | || t == signed_char_type_node | |
2709 | || t == unsigned_char_type_node) | |
3bdf5ad1 | 2710 | return 0; |
3932261a | 2711 | |
d18b1ed8 | 2712 | /* If it has the may_alias attribute, it can alias anything. */ |
74d86f4f | 2713 | if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t))) |
d18b1ed8 OS |
2714 | return 0; |
2715 | ||
f824e5c3 RK |
2716 | /* The C standard specifically allows aliasing between signed and |
2717 | unsigned variants of the same type. We treat the signed | |
2718 | variant as canonical. */ | |
8df83eae | 2719 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) |
8f215dce | 2720 | { |
ceef8ce4 | 2721 | tree t1 = c_common_signed_type (t); |
f824e5c3 | 2722 | |
8f215dce JJ |
2723 | /* t1 == t can happen for boolean nodes which are always unsigned. */ |
2724 | if (t1 != t) | |
2725 | return get_alias_set (t1); | |
2726 | } | |
3bdf5ad1 | 2727 | else if (POINTER_TYPE_P (t)) |
02af3af6 | 2728 | { |
3bdf5ad1 | 2729 | tree t1; |
02af3af6 MS |
2730 | |
2731 | /* Unfortunately, there is no canonical form of a pointer type. | |
2732 | In particular, if we have `typedef int I', then `int *', and | |
2733 | `I *' are different types. So, we have to pick a canonical | |
2734 | representative. We do this below. | |
d125d268 | 2735 | |
b61148dd MM |
2736 | Technically, this approach is actually more conservative that |
2737 | it needs to be. In particular, `const int *' and `int *' | |
684d9f3b | 2738 | should be in different alias sets, according to the C and C++ |
b61148dd MM |
2739 | standard, since their types are not the same, and so, |
2740 | technically, an `int **' and `const int **' cannot point at | |
2741 | the same thing. | |
2742 | ||
6de9cd9a | 2743 | But, the standard is wrong. In particular, this code is |
b61148dd MM |
2744 | legal C++: |
2745 | ||
2746 | int *ip; | |
2747 | int **ipp = &ip; | |
162f92bb | 2748 | const int* const* cipp = ipp; |
b61148dd | 2749 | |
6de9cd9a | 2750 | And, it doesn't make sense for that to be legal unless you |
b61148dd MM |
2751 | can dereference IPP and CIPP. So, we ignore cv-qualifiers on |
2752 | the pointed-to types. This issue has been reported to the | |
2753 | C++ committee. */ | |
12e1243e | 2754 | t1 = build_type_no_quals (t); |
3bdf5ad1 RK |
2755 | if (t1 != t) |
2756 | return get_alias_set (t1); | |
02af3af6 | 2757 | } |
ece32014 | 2758 | |
6de9cd9a DN |
2759 | /* Handle the case of multiple type nodes referring to "the same" type, |
2760 | which occurs with IMA. These share an alias set. FIXME: Currently only | |
2761 | C90 is handled. (In C99 type compatibility is not transitive, which | |
2762 | complicates things mightily. The alias set splay trees can theoretically | |
2763 | represent this, but insertion is tricky when you consider all the | |
2764 | different orders things might arrive in.) */ | |
2765 | ||
2766 | if (c_language != clk_c || flag_isoc99) | |
2767 | return -1; | |
2768 | ||
9cf737f8 | 2769 | /* Save time if there's only one input file. */ |
d974312d | 2770 | if (num_in_fnames == 1) |
6de9cd9a DN |
2771 | return -1; |
2772 | ||
2773 | /* Pointers need special handling if they point to any type that | |
2774 | needs special handling (below). */ | |
2775 | if (TREE_CODE (t) == POINTER_TYPE) | |
2776 | { | |
2777 | tree t2; | |
2778 | /* Find bottom type under any nested POINTERs. */ | |
9f63daea | 2779 | for (t2 = TREE_TYPE (t); |
6de9cd9a DN |
2780 | TREE_CODE (t2) == POINTER_TYPE; |
2781 | t2 = TREE_TYPE (t2)) | |
2782 | ; | |
9f63daea | 2783 | if (TREE_CODE (t2) != RECORD_TYPE |
6de9cd9a DN |
2784 | && TREE_CODE (t2) != ENUMERAL_TYPE |
2785 | && TREE_CODE (t2) != QUAL_UNION_TYPE | |
2786 | && TREE_CODE (t2) != UNION_TYPE) | |
2787 | return -1; | |
2788 | if (TYPE_SIZE (t2) == 0) | |
2789 | return -1; | |
2790 | } | |
2791 | /* These are the only cases that need special handling. */ | |
9f63daea | 2792 | if (TREE_CODE (t) != RECORD_TYPE |
6de9cd9a DN |
2793 | && TREE_CODE (t) != ENUMERAL_TYPE |
2794 | && TREE_CODE (t) != QUAL_UNION_TYPE | |
2795 | && TREE_CODE (t) != UNION_TYPE | |
2796 | && TREE_CODE (t) != POINTER_TYPE) | |
2797 | return -1; | |
2798 | /* Undefined? */ | |
2799 | if (TYPE_SIZE (t) == 0) | |
2800 | return -1; | |
2801 | ||
9f63daea | 2802 | /* Look up t in hash table. Only one of the compatible types within each |
6de9cd9a DN |
2803 | alias set is recorded in the table. */ |
2804 | if (!type_hash_table) | |
4fe52ce9 | 2805 | type_hash_table = htab_create_ggc (1021, c_type_hash, |
6de9cd9a DN |
2806 | (htab_eq) lang_hooks.types_compatible_p, |
2807 | NULL); | |
2808 | slot = htab_find_slot (type_hash_table, t, INSERT); | |
2809 | if (*slot != NULL) | |
6a3203c8 AP |
2810 | { |
2811 | TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot); | |
2812 | return TYPE_ALIAS_SET ((tree)*slot); | |
2813 | } | |
6de9cd9a DN |
2814 | else |
2815 | /* Our caller will assign and record (in t) a new alias set; all we need | |
2816 | to do is remember t in the hash table. */ | |
2817 | *slot = t; | |
2818 | ||
3bdf5ad1 | 2819 | return -1; |
41472af8 | 2820 | } |
0213a355 | 2821 | \f |
fa72b064 | 2822 | /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the |
ea793912 GDR |
2823 | second parameter indicates which OPERATOR is being applied. The COMPLAIN |
2824 | flag controls whether we should diagnose possibly ill-formed | |
2825 | constructs or not. */ | |
03a08664 | 2826 | |
0213a355 | 2827 | tree |
03a08664 | 2828 | c_sizeof_or_alignof_type (tree type, bool is_sizeof, int complain) |
0213a355 | 2829 | { |
fa72b064 GDR |
2830 | const char *op_name; |
2831 | tree value = NULL; | |
2832 | enum tree_code type_code = TREE_CODE (type); | |
35b1a6fa | 2833 | |
03a08664 | 2834 | op_name = is_sizeof ? "sizeof" : "__alignof__"; |
35b1a6fa | 2835 | |
fa72b064 | 2836 | if (type_code == FUNCTION_TYPE) |
0213a355 | 2837 | { |
03a08664 | 2838 | if (is_sizeof) |
fa72b064 | 2839 | { |
ea793912 | 2840 | if (complain && (pedantic || warn_pointer_arith)) |
bda67431 | 2841 | pedwarn ("invalid application of %<sizeof%> to a function type"); |
fa72b064 GDR |
2842 | value = size_one_node; |
2843 | } | |
2844 | else | |
2845 | value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
2846 | } | |
2847 | else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
2848 | { | |
35b1a6fa | 2849 | if (type_code == VOID_TYPE |
ea793912 | 2850 | && complain && (pedantic || warn_pointer_arith)) |
bda67431 | 2851 | pedwarn ("invalid application of %qs to a void type", op_name); |
fa72b064 | 2852 | value = size_one_node; |
0213a355 | 2853 | } |
0213a355 JM |
2854 | else if (!COMPLETE_TYPE_P (type)) |
2855 | { | |
ea793912 | 2856 | if (complain) |
bda67431 | 2857 | error ("invalid application of %qs to incomplete type %qT ", |
d5a10cf0 | 2858 | op_name, type); |
fa72b064 | 2859 | value = size_zero_node; |
0213a355 JM |
2860 | } |
2861 | else | |
fa72b064 | 2862 | { |
03a08664 | 2863 | if (is_sizeof) |
fa72b064 GDR |
2864 | /* Convert in case a char is more than one unit. */ |
2865 | value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
2866 | size_int (TYPE_PRECISION (char_type_node) | |
2867 | / BITS_PER_UNIT)); | |
2868 | else | |
a4e9ffe5 | 2869 | value = size_int (TYPE_ALIGN_UNIT (type)); |
fa72b064 | 2870 | } |
0213a355 | 2871 | |
fa72b064 GDR |
2872 | /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. |
2873 | TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
2874 | never happen. However, this node should really have type | |
2875 | `size_t', which is just a typedef for an ordinary integer type. */ | |
987b67bc | 2876 | value = fold_build1 (NOP_EXPR, size_type_node, value); |
4094f4d2 | 2877 | gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value))); |
35b1a6fa | 2878 | |
fa72b064 | 2879 | return value; |
0213a355 JM |
2880 | } |
2881 | ||
2882 | /* Implement the __alignof keyword: Return the minimum required | |
2883 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
2884 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
2885 | "aligned" __attribute__ specification). */ | |
7f4edbcb | 2886 | |
0213a355 | 2887 | tree |
35b1a6fa | 2888 | c_alignof_expr (tree expr) |
0213a355 JM |
2889 | { |
2890 | tree t; | |
2891 | ||
2892 | if (TREE_CODE (expr) == VAR_DECL) | |
a4e9ffe5 | 2893 | t = size_int (DECL_ALIGN_UNIT (expr)); |
35b1a6fa | 2894 | |
0213a355 JM |
2895 | else if (TREE_CODE (expr) == COMPONENT_REF |
2896 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
2897 | { | |
bda67431 | 2898 | error ("%<__alignof%> applied to a bit-field"); |
0213a355 JM |
2899 | t = size_one_node; |
2900 | } | |
2901 | else if (TREE_CODE (expr) == COMPONENT_REF | |
173bf5be | 2902 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) |
a4e9ffe5 | 2903 | t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1))); |
35b1a6fa | 2904 | |
0213a355 JM |
2905 | else if (TREE_CODE (expr) == INDIRECT_REF) |
2906 | { | |
2907 | tree t = TREE_OPERAND (expr, 0); | |
2908 | tree best = t; | |
2909 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
35b1a6fa | 2910 | |
0213a355 | 2911 | while (TREE_CODE (t) == NOP_EXPR |
173bf5be | 2912 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) |
0213a355 JM |
2913 | { |
2914 | int thisalign; | |
2915 | ||
2916 | t = TREE_OPERAND (t, 0); | |
2917 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
2918 | if (thisalign > bestalign) | |
2919 | best = t, bestalign = thisalign; | |
2920 | } | |
2921 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
2922 | } | |
2923 | else | |
2924 | return c_alignof (TREE_TYPE (expr)); | |
2925 | ||
987b67bc | 2926 | return fold_build1 (NOP_EXPR, size_type_node, t); |
0213a355 JM |
2927 | } |
2928 | \f | |
df061a43 RS |
2929 | /* Handle C and C++ default attributes. */ |
2930 | ||
2931 | enum built_in_attribute | |
2932 | { | |
2933 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
2934 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
2935 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
2936 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
df061a43 RS |
2937 | #include "builtin-attrs.def" |
2938 | #undef DEF_ATTR_NULL_TREE | |
2939 | #undef DEF_ATTR_INT | |
2940 | #undef DEF_ATTR_IDENT | |
2941 | #undef DEF_ATTR_TREE_LIST | |
df061a43 RS |
2942 | ATTR_LAST |
2943 | }; | |
2944 | ||
2945 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
2946 | ||
35b1a6fa | 2947 | static void c_init_attributes (void); |
df061a43 | 2948 | |
7f4edbcb | 2949 | /* Build tree nodes and builtin functions common to both C and C++ language |
6bcedb4e | 2950 | frontends. */ |
3bdf5ad1 | 2951 | |
7f4edbcb | 2952 | void |
35b1a6fa | 2953 | c_common_nodes_and_builtins (void) |
7f4edbcb | 2954 | { |
35b1a6fa | 2955 | enum builtin_type |
10841285 MM |
2956 | { |
2957 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
2958 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
2959 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
2960 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
2961 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
2962 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
10a0d495 JJ |
2963 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, |
2964 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) \ | |
2965 | NAME, | |
10841285 MM |
2966 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
2967 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
2968 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
08291658 | 2969 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
10a0d495 JJ |
2970 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, |
2971 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
2972 | NAME, | |
10841285 MM |
2973 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
2974 | #include "builtin-types.def" | |
2975 | #undef DEF_PRIMITIVE_TYPE | |
2976 | #undef DEF_FUNCTION_TYPE_0 | |
2977 | #undef DEF_FUNCTION_TYPE_1 | |
2978 | #undef DEF_FUNCTION_TYPE_2 | |
2979 | #undef DEF_FUNCTION_TYPE_3 | |
2980 | #undef DEF_FUNCTION_TYPE_4 | |
10a0d495 JJ |
2981 | #undef DEF_FUNCTION_TYPE_5 |
2982 | #undef DEF_FUNCTION_TYPE_6 | |
10841285 MM |
2983 | #undef DEF_FUNCTION_TYPE_VAR_0 |
2984 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
2985 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
08291658 | 2986 | #undef DEF_FUNCTION_TYPE_VAR_3 |
10a0d495 JJ |
2987 | #undef DEF_FUNCTION_TYPE_VAR_4 |
2988 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
10841285 MM |
2989 | #undef DEF_POINTER_TYPE |
2990 | BT_LAST | |
2991 | }; | |
2992 | ||
2993 | typedef enum builtin_type builtin_type; | |
2994 | ||
39627fed | 2995 | tree builtin_types[(int) BT_LAST + 1]; |
eaa7c03f JM |
2996 | int wchar_type_size; |
2997 | tree array_domain_type; | |
9f720c3e | 2998 | tree va_list_ref_type_node; |
daf68dd7 | 2999 | tree va_list_arg_type_node; |
d3707adb | 3000 | |
eaa7c03f | 3001 | /* Define `int' and `char' first so that dbx will output them first. */ |
6496a589 | 3002 | record_builtin_type (RID_INT, NULL, integer_type_node); |
eaa7c03f JM |
3003 | record_builtin_type (RID_CHAR, "char", char_type_node); |
3004 | ||
3005 | /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
3006 | "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
3007 | but not C. Are the conditionals here needed? */ | |
37fa72e9 | 3008 | if (c_dialect_cxx ()) |
6496a589 | 3009 | record_builtin_type (RID_SIGNED, NULL, integer_type_node); |
eaa7c03f JM |
3010 | record_builtin_type (RID_LONG, "long int", long_integer_type_node); |
3011 | record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
3012 | record_builtin_type (RID_MAX, "long unsigned int", | |
3013 | long_unsigned_type_node); | |
37fa72e9 | 3014 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3015 | record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); |
3016 | record_builtin_type (RID_MAX, "long long int", | |
3017 | long_long_integer_type_node); | |
3018 | record_builtin_type (RID_MAX, "long long unsigned int", | |
3019 | long_long_unsigned_type_node); | |
37fa72e9 | 3020 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3021 | record_builtin_type (RID_MAX, "long long unsigned", |
3022 | long_long_unsigned_type_node); | |
3023 | record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
3024 | record_builtin_type (RID_MAX, "short unsigned int", | |
3025 | short_unsigned_type_node); | |
37fa72e9 | 3026 | if (c_dialect_cxx ()) |
eaa7c03f JM |
3027 | record_builtin_type (RID_MAX, "unsigned short", |
3028 | short_unsigned_type_node); | |
3029 | ||
3030 | /* Define both `signed char' and `unsigned char'. */ | |
3031 | record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
3032 | record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
3033 | ||
b0c48229 NB |
3034 | /* These are types that c_common_type_for_size and |
3035 | c_common_type_for_mode use. */ | |
ae2bcd98 RS |
3036 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3037 | intQI_type_node)); | |
3038 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3039 | intHI_type_node)); | |
3040 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3041 | intSI_type_node)); | |
3042 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3043 | intDI_type_node)); | |
eaa7c03f | 3044 | #if HOST_BITS_PER_WIDE_INT >= 64 |
1e1b8649 AP |
3045 | if (targetm.scalar_mode_supported_p (TImode)) |
3046 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3047 | get_identifier ("__int128_t"), | |
3048 | intTI_type_node)); | |
eaa7c03f | 3049 | #endif |
ae2bcd98 RS |
3050 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3051 | unsigned_intQI_type_node)); | |
3052 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3053 | unsigned_intHI_type_node)); | |
3054 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3055 | unsigned_intSI_type_node)); | |
3056 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
3057 | unsigned_intDI_type_node)); | |
eaa7c03f | 3058 | #if HOST_BITS_PER_WIDE_INT >= 64 |
1e1b8649 AP |
3059 | if (targetm.scalar_mode_supported_p (TImode)) |
3060 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3061 | get_identifier ("__uint128_t"), | |
3062 | unsigned_intTI_type_node)); | |
eaa7c03f JM |
3063 | #endif |
3064 | ||
3065 | /* Create the widest literal types. */ | |
3066 | widest_integer_literal_type_node | |
3067 | = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
ae2bcd98 RS |
3068 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3069 | widest_integer_literal_type_node)); | |
eaa7c03f JM |
3070 | |
3071 | widest_unsigned_literal_type_node | |
3072 | = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
ae2bcd98 RS |
3073 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
3074 | widest_unsigned_literal_type_node)); | |
eaa7c03f JM |
3075 | |
3076 | /* `unsigned long' is the standard type for sizeof. | |
3077 | Note that stddef.h uses `unsigned long', | |
3078 | and this must agree, even if long and int are the same size. */ | |
c9f8536c | 3079 | size_type_node = |
eaa7c03f | 3080 | TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); |
c9f8536c MM |
3081 | signed_size_type_node = c_common_signed_type (size_type_node); |
3082 | set_sizetype (size_type_node); | |
eaa7c03f | 3083 | |
d1c38823 ZD |
3084 | pid_type_node = |
3085 | TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
3086 | ||
eaa7c03f JM |
3087 | build_common_tree_nodes_2 (flag_short_double); |
3088 | ||
6496a589 KG |
3089 | record_builtin_type (RID_FLOAT, NULL, float_type_node); |
3090 | record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
eaa7c03f JM |
3091 | record_builtin_type (RID_MAX, "long double", long_double_type_node); |
3092 | ||
ae2bcd98 RS |
3093 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
3094 | get_identifier ("complex int"), | |
3095 | complex_integer_type_node)); | |
3096 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3097 | get_identifier ("complex float"), | |
3098 | complex_float_type_node)); | |
3099 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
3100 | get_identifier ("complex double"), | |
3101 | complex_double_type_node)); | |
3102 | lang_hooks.decls.pushdecl | |
43577e6b NB |
3103 | (build_decl (TYPE_DECL, get_identifier ("complex long double"), |
3104 | complex_long_double_type_node)); | |
eaa7c03f | 3105 | |
498c0f27 JJ |
3106 | if (c_dialect_cxx ()) |
3107 | /* For C++, make fileptr_type_node a distinct void * type until | |
3108 | FILE type is defined. */ | |
8dd16ecc | 3109 | fileptr_type_node = build_variant_type_copy (ptr_type_node); |
498c0f27 | 3110 | |
6496a589 | 3111 | record_builtin_type (RID_VOID, NULL, void_type_node); |
eaa7c03f | 3112 | |
8c27b7d4 | 3113 | /* This node must not be shared. */ |
4a90aeeb | 3114 | void_zero_node = make_node (INTEGER_CST); |
10841285 MM |
3115 | TREE_TYPE (void_zero_node) = void_type_node; |
3116 | ||
eaa7c03f JM |
3117 | void_list_node = build_void_list_node (); |
3118 | ||
3119 | /* Make a type to be the domain of a few array types | |
3120 | whose domains don't really matter. | |
3121 | 200 is small enough that it always fits in size_t | |
3122 | and large enough that it can hold most function names for the | |
3123 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
3124 | array_domain_type = build_index_type (size_int (200)); | |
3125 | ||
3126 | /* Make a type for arrays of characters. | |
3127 | With luck nothing will ever really depend on the length of this | |
3128 | array type. */ | |
3129 | char_array_type_node | |
3130 | = build_array_type (char_type_node, array_domain_type); | |
3131 | ||
3132 | /* Likewise for arrays of ints. */ | |
3133 | int_array_type_node | |
3134 | = build_array_type (integer_type_node, array_domain_type); | |
3135 | ||
10841285 MM |
3136 | string_type_node = build_pointer_type (char_type_node); |
3137 | const_string_type_node | |
3138 | = build_pointer_type (build_qualified_type | |
3139 | (char_type_node, TYPE_QUAL_CONST)); | |
3140 | ||
eaa7c03f | 3141 | /* This is special for C++ so functions can be overloaded. */ |
a11eba95 | 3142 | wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); |
eaa7c03f JM |
3143 | wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); |
3144 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
37fa72e9 | 3145 | if (c_dialect_cxx ()) |
eaa7c03f | 3146 | { |
8df83eae | 3147 | if (TYPE_UNSIGNED (wchar_type_node)) |
eaa7c03f JM |
3148 | wchar_type_node = make_unsigned_type (wchar_type_size); |
3149 | else | |
3150 | wchar_type_node = make_signed_type (wchar_type_size); | |
3151 | record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
3152 | } | |
3153 | else | |
3154 | { | |
ceef8ce4 NB |
3155 | signed_wchar_type_node = c_common_signed_type (wchar_type_node); |
3156 | unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node); | |
eaa7c03f JM |
3157 | } |
3158 | ||
3159 | /* This is for wide string constants. */ | |
3160 | wchar_array_type_node | |
3161 | = build_array_type (wchar_type_node, array_domain_type); | |
3162 | ||
5fd8e536 JM |
3163 | wint_type_node = |
3164 | TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
3165 | ||
3166 | intmax_type_node = | |
3167 | TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
3168 | uintmax_type_node = | |
3169 | TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
3170 | ||
3171 | default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
3172 | ptrdiff_type_node | |
3173 | = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
ceef8ce4 | 3174 | unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); |
5fd8e536 | 3175 | |
ae2bcd98 | 3176 | lang_hooks.decls.pushdecl |
43577e6b NB |
3177 | (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"), |
3178 | va_list_type_node)); | |
daf68dd7 | 3179 | |
daf68dd7 | 3180 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
9f720c3e GK |
3181 | { |
3182 | va_list_arg_type_node = va_list_ref_type_node = | |
3183 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
3184 | } | |
daf68dd7 | 3185 | else |
9f720c3e GK |
3186 | { |
3187 | va_list_arg_type_node = va_list_type_node; | |
3188 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
3189 | } | |
35b1a6fa | 3190 | |
10841285 MM |
3191 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ |
3192 | builtin_types[(int) ENUM] = VALUE; | |
3193 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
3194 | builtin_types[(int) ENUM] \ | |
3195 | = build_function_type (builtin_types[(int) RETURN], \ | |
3196 | void_list_node); | |
3197 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
3198 | builtin_types[(int) ENUM] \ | |
3199 | = build_function_type (builtin_types[(int) RETURN], \ | |
3200 | tree_cons (NULL_TREE, \ | |
3201 | builtin_types[(int) ARG1], \ | |
3202 | void_list_node)); | |
3203 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
3204 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3205 | = build_function_type \ |
10841285 MM |
3206 | (builtin_types[(int) RETURN], \ |
3207 | tree_cons (NULL_TREE, \ | |
3208 | builtin_types[(int) ARG1], \ | |
3209 | tree_cons (NULL_TREE, \ | |
3210 | builtin_types[(int) ARG2], \ | |
3211 | void_list_node))); | |
3212 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3213 | builtin_types[(int) ENUM] \ | |
3214 | = build_function_type \ | |
3215 | (builtin_types[(int) RETURN], \ | |
3216 | tree_cons (NULL_TREE, \ | |
3217 | builtin_types[(int) ARG1], \ | |
3218 | tree_cons (NULL_TREE, \ | |
3219 | builtin_types[(int) ARG2], \ | |
3220 | tree_cons (NULL_TREE, \ | |
3221 | builtin_types[(int) ARG3], \ | |
3222 | void_list_node)))); | |
3223 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
3224 | builtin_types[(int) ENUM] \ | |
3225 | = build_function_type \ | |
3226 | (builtin_types[(int) RETURN], \ | |
3227 | tree_cons (NULL_TREE, \ | |
3228 | builtin_types[(int) ARG1], \ | |
3229 | tree_cons (NULL_TREE, \ | |
3230 | builtin_types[(int) ARG2], \ | |
35b1a6fa | 3231 | tree_cons \ |
10841285 | 3232 | (NULL_TREE, \ |
35b1a6fa | 3233 | builtin_types[(int) ARG3], \ |
10841285 MM |
3234 | tree_cons (NULL_TREE, \ |
3235 | builtin_types[(int) ARG4], \ | |
3236 | void_list_node))))); | |
10a0d495 JJ |
3237 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ |
3238 | builtin_types[(int) ENUM] \ | |
3239 | = build_function_type \ | |
3240 | (builtin_types[(int) RETURN], \ | |
3241 | tree_cons (NULL_TREE, \ | |
3242 | builtin_types[(int) ARG1], \ | |
3243 | tree_cons (NULL_TREE, \ | |
3244 | builtin_types[(int) ARG2], \ | |
3245 | tree_cons \ | |
3246 | (NULL_TREE, \ | |
3247 | builtin_types[(int) ARG3], \ | |
3248 | tree_cons (NULL_TREE, \ | |
3249 | builtin_types[(int) ARG4], \ | |
3250 | tree_cons (NULL_TREE, \ | |
3251 | builtin_types[(int) ARG5],\ | |
3252 | void_list_node)))))); | |
3253 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
3254 | ARG6) \ | |
3255 | builtin_types[(int) ENUM] \ | |
3256 | = build_function_type \ | |
3257 | (builtin_types[(int) RETURN], \ | |
3258 | tree_cons (NULL_TREE, \ | |
3259 | builtin_types[(int) ARG1], \ | |
3260 | tree_cons (NULL_TREE, \ | |
3261 | builtin_types[(int) ARG2], \ | |
3262 | tree_cons \ | |
3263 | (NULL_TREE, \ | |
3264 | builtin_types[(int) ARG3], \ | |
3265 | tree_cons \ | |
3266 | (NULL_TREE, \ | |
3267 | builtin_types[(int) ARG4], \ | |
3268 | tree_cons (NULL_TREE, \ | |
3269 | builtin_types[(int) ARG5], \ | |
3270 | tree_cons (NULL_TREE, \ | |
3271 | builtin_types[(int) ARG6],\ | |
3272 | void_list_node))))))); | |
10841285 MM |
3273 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ |
3274 | builtin_types[(int) ENUM] \ | |
3275 | = build_function_type (builtin_types[(int) RETURN], NULL_TREE); | |
3276 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
3277 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3278 | = build_function_type (builtin_types[(int) RETURN], \ |
10841285 MM |
3279 | tree_cons (NULL_TREE, \ |
3280 | builtin_types[(int) ARG1], \ | |
ad3fd36f KG |
3281 | NULL_TREE)); |
3282 | ||
10841285 MM |
3283 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ |
3284 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3285 | = build_function_type \ |
10841285 MM |
3286 | (builtin_types[(int) RETURN], \ |
3287 | tree_cons (NULL_TREE, \ | |
3288 | builtin_types[(int) ARG1], \ | |
3289 | tree_cons (NULL_TREE, \ | |
3290 | builtin_types[(int) ARG2], \ | |
3291 | NULL_TREE))); | |
08291658 RS |
3292 | |
3293 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3294 | builtin_types[(int) ENUM] \ | |
35b1a6fa | 3295 | = build_function_type \ |
08291658 RS |
3296 | (builtin_types[(int) RETURN], \ |
3297 | tree_cons (NULL_TREE, \ | |
3298 | builtin_types[(int) ARG1], \ | |
3299 | tree_cons (NULL_TREE, \ | |
3300 | builtin_types[(int) ARG2], \ | |
3301 | tree_cons (NULL_TREE, \ | |
3302 | builtin_types[(int) ARG3], \ | |
3303 | NULL_TREE)))); | |
3304 | ||
10a0d495 JJ |
3305 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ |
3306 | builtin_types[(int) ENUM] \ | |
3307 | = build_function_type \ | |
3308 | (builtin_types[(int) RETURN], \ | |
3309 | tree_cons (NULL_TREE, \ | |
3310 | builtin_types[(int) ARG1], \ | |
3311 | tree_cons (NULL_TREE, \ | |
3312 | builtin_types[(int) ARG2], \ | |
3313 | tree_cons (NULL_TREE, \ | |
3314 | builtin_types[(int) ARG3], \ | |
3315 | tree_cons (NULL_TREE, \ | |
3316 | builtin_types[(int) ARG4],\ | |
3317 | NULL_TREE))))); | |
3318 | ||
3319 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, \ | |
3320 | ARG5) \ | |
3321 | builtin_types[(int) ENUM] \ | |
3322 | = build_function_type \ | |
3323 | (builtin_types[(int) RETURN], \ | |
3324 | tree_cons (NULL_TREE, \ | |
3325 | builtin_types[(int) ARG1], \ | |
3326 | tree_cons (NULL_TREE, \ | |
3327 | builtin_types[(int) ARG2], \ | |
3328 | tree_cons \ | |
3329 | (NULL_TREE, \ | |
3330 | builtin_types[(int) ARG3], \ | |
3331 | tree_cons (NULL_TREE, \ | |
3332 | builtin_types[(int) ARG4], \ | |
3333 | tree_cons (NULL_TREE, \ | |
3334 | builtin_types[(int) ARG5],\ | |
3335 | NULL_TREE)))))); | |
3336 | ||
10841285 MM |
3337 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ |
3338 | builtin_types[(int) ENUM] \ | |
3339 | = build_pointer_type (builtin_types[(int) TYPE]); | |
3340 | #include "builtin-types.def" | |
3341 | #undef DEF_PRIMITIVE_TYPE | |
3342 | #undef DEF_FUNCTION_TYPE_1 | |
3343 | #undef DEF_FUNCTION_TYPE_2 | |
3344 | #undef DEF_FUNCTION_TYPE_3 | |
3345 | #undef DEF_FUNCTION_TYPE_4 | |
10a0d495 JJ |
3346 | #undef DEF_FUNCTION_TYPE_5 |
3347 | #undef DEF_FUNCTION_TYPE_6 | |
10841285 MM |
3348 | #undef DEF_FUNCTION_TYPE_VAR_0 |
3349 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
08291658 RS |
3350 | #undef DEF_FUNCTION_TYPE_VAR_2 |
3351 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
10a0d495 JJ |
3352 | #undef DEF_FUNCTION_TYPE_VAR_4 |
3353 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
10841285 | 3354 | #undef DEF_POINTER_TYPE |
39627fed | 3355 | builtin_types[(int) BT_LAST] = NULL_TREE; |
10841285 | 3356 | |
03aa99d4 | 3357 | c_init_attributes (); |
df061a43 | 3358 | |
c6a912da RH |
3359 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ |
3360 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
3361 | if (NAME && COND) \ | |
9bc15050 RG |
3362 | def_builtin_1 (ENUM, NAME, CLASS, \ |
3363 | builtin_types[(int) TYPE], \ | |
3364 | builtin_types[(int) LIBTYPE], \ | |
3365 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
3366 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
10841285 MM |
3367 | #include "builtins.def" |
3368 | #undef DEF_BUILTIN | |
52a11cbf | 3369 | |
c6a912da RH |
3370 | build_common_builtin_nodes (); |
3371 | ||
5fd9b178 | 3372 | targetm.init_builtins (); |
c31b8e1b ZW |
3373 | if (flag_mudflap) |
3374 | mudflap_init (); | |
4677862a | 3375 | |
5b47282c | 3376 | main_identifier_node = get_identifier ("main"); |
b2f97e4a MM |
3377 | |
3378 | /* Create the built-in __null node. It is important that this is | |
3379 | not shared. */ | |
3380 | null_node = make_node (INTEGER_CST); | |
3381 | TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0); | |
7f4edbcb | 3382 | } |
d3707adb | 3383 | |
b482789c MA |
3384 | /* Look up the function in built_in_decls that corresponds to DECL |
3385 | and set ASMSPEC as its user assembler name. DECL must be a | |
6c6cfbfd | 3386 | function decl that declares a builtin. */ |
b482789c MA |
3387 | |
3388 | void | |
3389 | set_builtin_user_assembler_name (tree decl, const char *asmspec) | |
3390 | { | |
3391 | tree builtin; | |
3392 | gcc_assert (TREE_CODE (decl) == FUNCTION_DECL | |
3393 | && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL | |
3394 | && asmspec != 0); | |
3395 | ||
3396 | builtin = built_in_decls [DECL_FUNCTION_CODE (decl)]; | |
3397 | set_user_assembler_name (builtin, asmspec); | |
3398 | if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY) | |
3399 | init_block_move_fn (asmspec); | |
3400 | else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET) | |
3401 | init_block_clear_fn (asmspec); | |
3402 | } | |
3403 | ||
d3707adb | 3404 | tree |
35b1a6fa | 3405 | build_va_arg (tree expr, tree type) |
d3707adb RH |
3406 | { |
3407 | return build1 (VA_ARG_EXPR, type, expr); | |
3408 | } | |
fc2aaf30 JM |
3409 | |
3410 | ||
7d14c755 JM |
3411 | /* Linked list of disabled built-in functions. */ |
3412 | ||
3413 | typedef struct disabled_builtin | |
3414 | { | |
3415 | const char *name; | |
3416 | struct disabled_builtin *next; | |
3417 | } disabled_builtin; | |
3418 | static disabled_builtin *disabled_builtins = NULL; | |
3419 | ||
35b1a6fa | 3420 | static bool builtin_function_disabled_p (const char *); |
7d14c755 JM |
3421 | |
3422 | /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
3423 | begins with "__builtin_", give an error. */ | |
3424 | ||
3425 | void | |
35b1a6fa | 3426 | disable_builtin_function (const char *name) |
7d14c755 JM |
3427 | { |
3428 | if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
bda67431 | 3429 | error ("cannot disable built-in function %qs", name); |
7d14c755 JM |
3430 | else |
3431 | { | |
1ad463f4 BI |
3432 | disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin); |
3433 | new_disabled_builtin->name = name; | |
3434 | new_disabled_builtin->next = disabled_builtins; | |
3435 | disabled_builtins = new_disabled_builtin; | |
7d14c755 JM |
3436 | } |
3437 | } | |
3438 | ||
3439 | ||
3440 | /* Return true if the built-in function NAME has been disabled, false | |
3441 | otherwise. */ | |
3442 | ||
3443 | static bool | |
35b1a6fa | 3444 | builtin_function_disabled_p (const char *name) |
7d14c755 JM |
3445 | { |
3446 | disabled_builtin *p; | |
3447 | for (p = disabled_builtins; p != NULL; p = p->next) | |
3448 | { | |
3449 | if (strcmp (name, p->name) == 0) | |
3450 | return true; | |
3451 | } | |
3452 | return false; | |
3453 | } | |
3454 | ||
3455 | ||
9bc15050 RG |
3456 | /* Worker for DEF_BUILTIN. |
3457 | Possibly define a builtin function with one or two names. | |
3458 | Does not declare a non-__builtin_ function if flag_no_builtin, or if | |
3459 | nonansi_p and flag_no_nonansi_builtin. */ | |
fc2aaf30 | 3460 | |
9bc15050 RG |
3461 | static void |
3462 | def_builtin_1 (enum built_in_function fncode, | |
3463 | const char *name, | |
3464 | enum built_in_class fnclass, | |
3465 | tree fntype, tree libtype, | |
3466 | bool both_p, bool fallback_p, bool nonansi_p, | |
3467 | tree fnattrs, bool implicit_p) | |
fc2aaf30 | 3468 | { |
9bc15050 RG |
3469 | tree decl; |
3470 | const char *libname; | |
3471 | ||
3472 | gcc_assert ((!both_p && !fallback_p) | |
3473 | || !strncmp (name, "__builtin_", | |
3474 | strlen ("__builtin_"))); | |
3475 | ||
3476 | libname = name + strlen ("__builtin_"); | |
3477 | decl = lang_hooks.builtin_function (name, fntype, fncode, fnclass, | |
3478 | (fallback_p ? libname : NULL), | |
3479 | fnattrs); | |
3480 | if (both_p | |
3481 | && !flag_no_builtin && !builtin_function_disabled_p (libname) | |
7d14c755 | 3482 | && !(nonansi_p && flag_no_nonansi_builtin)) |
9bc15050 RG |
3483 | lang_hooks.builtin_function (libname, libtype, fncode, fnclass, |
3484 | NULL, fnattrs); | |
7f685e17 | 3485 | |
9bc15050 RG |
3486 | built_in_decls[(int) fncode] = decl; |
3487 | if (implicit_p) | |
3488 | implicit_built_in_decls[(int) fncode] = decl; | |
fc2aaf30 | 3489 | } |
c530479e | 3490 | \f |
d72040f5 RH |
3491 | /* Nonzero if the type T promotes to int. This is (nearly) the |
3492 | integral promotions defined in ISO C99 6.3.1.1/2. */ | |
3493 | ||
3494 | bool | |
35b1a6fa | 3495 | c_promoting_integer_type_p (tree t) |
d72040f5 RH |
3496 | { |
3497 | switch (TREE_CODE (t)) | |
3498 | { | |
3499 | case INTEGER_TYPE: | |
3500 | return (TYPE_MAIN_VARIANT (t) == char_type_node | |
3501 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
3502 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
3503 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
c6c04fca RL |
3504 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node |
3505 | || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
d72040f5 RH |
3506 | |
3507 | case ENUMERAL_TYPE: | |
3508 | /* ??? Technically all enumerations not larger than an int | |
3509 | promote to an int. But this is used along code paths | |
3510 | that only want to notice a size change. */ | |
3511 | return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
3512 | ||
3513 | case BOOLEAN_TYPE: | |
3514 | return 1; | |
3515 | ||
3516 | default: | |
3517 | return 0; | |
3518 | } | |
3519 | } | |
3520 | ||
c530479e RH |
3521 | /* Return 1 if PARMS specifies a fixed number of parameters |
3522 | and none of their types is affected by default promotions. */ | |
3523 | ||
3524 | int | |
35b1a6fa | 3525 | self_promoting_args_p (tree parms) |
c530479e | 3526 | { |
b3694847 | 3527 | tree t; |
c530479e RH |
3528 | for (t = parms; t; t = TREE_CHAIN (t)) |
3529 | { | |
b3694847 | 3530 | tree type = TREE_VALUE (t); |
7e8176d7 | 3531 | |
c530479e RH |
3532 | if (TREE_CHAIN (t) == 0 && type != void_type_node) |
3533 | return 0; | |
3534 | ||
3535 | if (type == 0) | |
3536 | return 0; | |
3537 | ||
3538 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
3539 | return 0; | |
3540 | ||
d72040f5 | 3541 | if (c_promoting_integer_type_p (type)) |
c530479e RH |
3542 | return 0; |
3543 | } | |
3544 | return 1; | |
3545 | } | |
5eda3d66 | 3546 | |
0a7394bc MM |
3547 | /* Recursively examines the array elements of TYPE, until a non-array |
3548 | element type is found. */ | |
3549 | ||
3550 | tree | |
35b1a6fa | 3551 | strip_array_types (tree type) |
0a7394bc MM |
3552 | { |
3553 | while (TREE_CODE (type) == ARRAY_TYPE) | |
3554 | type = TREE_TYPE (type); | |
3555 | ||
3556 | return type; | |
3557 | } | |
3558 | ||
12ea3302 GDR |
3559 | /* Recursively remove any '*' or '&' operator from TYPE. */ |
3560 | tree | |
3561 | strip_pointer_operator (tree t) | |
3562 | { | |
3563 | while (POINTER_TYPE_P (t)) | |
3564 | t = TREE_TYPE (t); | |
3565 | return t; | |
3566 | } | |
3567 | ||
8f17b5c5 MM |
3568 | /* Used to compare case labels. K1 and K2 are actually tree nodes |
3569 | representing case labels, or NULL_TREE for a `default' label. | |
3570 | Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
3571 | K2, and 0 if K1 and K2 are equal. */ | |
3572 | ||
3573 | int | |
35b1a6fa | 3574 | case_compare (splay_tree_key k1, splay_tree_key k2) |
8f17b5c5 MM |
3575 | { |
3576 | /* Consider a NULL key (such as arises with a `default' label) to be | |
3577 | smaller than anything else. */ | |
3578 | if (!k1) | |
3579 | return k2 ? -1 : 0; | |
3580 | else if (!k2) | |
3581 | return k1 ? 1 : 0; | |
3582 | ||
3583 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
3584 | } | |
3585 | ||
3586 | /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If | |
3587 | LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is | |
3588 | actually a `default' label. If only HIGH_VALUE is NULL_TREE, then | |
3589 | case label was declared using the usual C/C++ syntax, rather than | |
3590 | the GNU case range extension. CASES is a tree containing all the | |
3591 | case ranges processed so far; COND is the condition for the | |
8c161995 RH |
3592 | switch-statement itself. Returns the CASE_LABEL_EXPR created, or |
3593 | ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */ | |
8f17b5c5 MM |
3594 | |
3595 | tree | |
a6c0a76c SB |
3596 | c_add_case_label (splay_tree cases, tree cond, tree orig_type, |
3597 | tree low_value, tree high_value) | |
8f17b5c5 MM |
3598 | { |
3599 | tree type; | |
3600 | tree label; | |
3601 | tree case_label; | |
3602 | splay_tree_node node; | |
3603 | ||
3604 | /* Create the LABEL_DECL itself. */ | |
6de9cd9a | 3605 | label = create_artificial_label (); |
8f17b5c5 MM |
3606 | |
3607 | /* If there was an error processing the switch condition, bail now | |
3608 | before we get more confused. */ | |
3609 | if (!cond || cond == error_mark_node) | |
6de9cd9a | 3610 | goto error_out; |
8f17b5c5 | 3611 | |
35b1a6fa AJ |
3612 | if ((low_value && TREE_TYPE (low_value) |
3613 | && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
8f17b5c5 MM |
3614 | || (high_value && TREE_TYPE (high_value) |
3615 | && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
522ddfa2 JM |
3616 | { |
3617 | error ("pointers are not permitted as case values"); | |
3618 | goto error_out; | |
3619 | } | |
8f17b5c5 MM |
3620 | |
3621 | /* Case ranges are a GNU extension. */ | |
3622 | if (high_value && pedantic) | |
37fa72e9 | 3623 | pedwarn ("range expressions in switch statements are non-standard"); |
8f17b5c5 MM |
3624 | |
3625 | type = TREE_TYPE (cond); | |
3626 | if (low_value) | |
3627 | { | |
3628 | low_value = check_case_value (low_value); | |
3629 | low_value = convert_and_check (type, low_value); | |
c0e22534 NS |
3630 | if (low_value == error_mark_node) |
3631 | goto error_out; | |
8f17b5c5 MM |
3632 | } |
3633 | if (high_value) | |
3634 | { | |
3635 | high_value = check_case_value (high_value); | |
3636 | high_value = convert_and_check (type, high_value); | |
c0e22534 NS |
3637 | if (high_value == error_mark_node) |
3638 | goto error_out; | |
8f17b5c5 MM |
3639 | } |
3640 | ||
c0e22534 NS |
3641 | if (low_value && high_value) |
3642 | { | |
3643 | /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
3644 | really a case range, even though it was written that way. | |
3645 | Remove the HIGH_VALUE to simplify later processing. */ | |
3646 | if (tree_int_cst_equal (low_value, high_value)) | |
3647 | high_value = NULL_TREE; | |
3648 | else if (!tree_int_cst_lt (low_value, high_value)) | |
3649 | warning (0, "empty range specified"); | |
3650 | } | |
8f17b5c5 | 3651 | |
a6c0a76c SB |
3652 | /* See if the case is in range of the type of the original testing |
3653 | expression. If both low_value and high_value are out of range, | |
3654 | don't insert the case label and return NULL_TREE. */ | |
3655 | if (low_value | |
3f75a254 JM |
3656 | && !check_case_bounds (type, orig_type, |
3657 | &low_value, high_value ? &high_value : NULL)) | |
a6c0a76c SB |
3658 | return NULL_TREE; |
3659 | ||
8f17b5c5 MM |
3660 | /* Look up the LOW_VALUE in the table of case labels we already |
3661 | have. */ | |
3662 | node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
3663 | /* If there was not an exact match, check for overlapping ranges. | |
3664 | There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
3665 | that's a `default' label and the only overlap is an exact match. */ | |
3666 | if (!node && (low_value || high_value)) | |
3667 | { | |
3668 | splay_tree_node low_bound; | |
3669 | splay_tree_node high_bound; | |
3670 | ||
3671 | /* Even though there wasn't an exact match, there might be an | |
3672 | overlap between this case range and another case range. | |
3673 | Since we've (inductively) not allowed any overlapping case | |
3674 | ranges, we simply need to find the greatest low case label | |
3675 | that is smaller that LOW_VALUE, and the smallest low case | |
3676 | label that is greater than LOW_VALUE. If there is an overlap | |
3677 | it will occur in one of these two ranges. */ | |
3678 | low_bound = splay_tree_predecessor (cases, | |
3679 | (splay_tree_key) low_value); | |
3680 | high_bound = splay_tree_successor (cases, | |
3681 | (splay_tree_key) low_value); | |
3682 | ||
3683 | /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
3684 | the LOW_VALUE, so there is no need to check unless the | |
3685 | LOW_BOUND is in fact itself a case range. */ | |
3686 | if (low_bound | |
3687 | && CASE_HIGH ((tree) low_bound->value) | |
3688 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
3689 | low_value) >= 0) | |
3690 | node = low_bound; | |
3691 | /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
3692 | range is bigger than the low end of the current range, so we | |
3693 | are only interested if the current range is a real range, and | |
3694 | not an ordinary case label. */ | |
35b1a6fa | 3695 | else if (high_bound |
8f17b5c5 MM |
3696 | && high_value |
3697 | && (tree_int_cst_compare ((tree) high_bound->key, | |
3698 | high_value) | |
3699 | <= 0)) | |
3700 | node = high_bound; | |
3701 | } | |
3702 | /* If there was an overlap, issue an error. */ | |
3703 | if (node) | |
3704 | { | |
8c161995 | 3705 | tree duplicate = CASE_LABEL ((tree) node->value); |
8f17b5c5 MM |
3706 | |
3707 | if (high_value) | |
3708 | { | |
3709 | error ("duplicate (or overlapping) case value"); | |
ddd2d57e | 3710 | error ("%Jthis is the first entry overlapping that value", duplicate); |
8f17b5c5 MM |
3711 | } |
3712 | else if (low_value) | |
3713 | { | |
3714 | error ("duplicate case value") ; | |
ddd2d57e | 3715 | error ("%Jpreviously used here", duplicate); |
8f17b5c5 MM |
3716 | } |
3717 | else | |
3718 | { | |
3719 | error ("multiple default labels in one switch"); | |
ddd2d57e | 3720 | error ("%Jthis is the first default label", duplicate); |
8f17b5c5 | 3721 | } |
6de9cd9a | 3722 | goto error_out; |
8f17b5c5 MM |
3723 | } |
3724 | ||
3725 | /* Add a CASE_LABEL to the statement-tree. */ | |
3726 | case_label = add_stmt (build_case_label (low_value, high_value, label)); | |
3727 | /* Register this case label in the splay tree. */ | |
35b1a6fa | 3728 | splay_tree_insert (cases, |
8f17b5c5 MM |
3729 | (splay_tree_key) low_value, |
3730 | (splay_tree_value) case_label); | |
3731 | ||
3732 | return case_label; | |
6de9cd9a DN |
3733 | |
3734 | error_out: | |
9e14e18f | 3735 | /* Add a label so that the back-end doesn't think that the beginning of |
6de9cd9a | 3736 | the switch is unreachable. Note that we do not add a case label, as |
41806d92 | 3737 | that just leads to duplicates and thence to failure later on. */ |
6de9cd9a DN |
3738 | if (!cases->root) |
3739 | { | |
3740 | tree t = create_artificial_label (); | |
9e14e18f | 3741 | add_stmt (build_stmt (LABEL_EXPR, t)); |
6de9cd9a DN |
3742 | } |
3743 | return error_mark_node; | |
3744 | } | |
3745 | ||
3746 | /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
3747 | Used to verify that case values match up with enumerator values. */ | |
3748 | ||
3749 | static void | |
3750 | match_case_to_enum_1 (tree key, tree type, tree label) | |
3751 | { | |
3752 | char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
3753 | ||
3754 | /* ??? Not working too hard to print the double-word value. | |
3755 | Should perhaps be done with %lwd in the diagnostic routines? */ | |
3756 | if (TREE_INT_CST_HIGH (key) == 0) | |
3757 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
3758 | TREE_INT_CST_LOW (key)); | |
3759 | else if (!TYPE_UNSIGNED (type) | |
3760 | && TREE_INT_CST_HIGH (key) == -1 | |
3761 | && TREE_INT_CST_LOW (key) != 0) | |
3762 | snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
3763 | -TREE_INT_CST_LOW (key)); | |
3764 | else | |
3765 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
3766 | TREE_INT_CST_HIGH (key), TREE_INT_CST_LOW (key)); | |
3767 | ||
3768 | if (TYPE_NAME (type) == 0) | |
d4ee4d25 | 3769 | warning (0, "%Jcase value %qs not in enumerated type", |
8c161995 | 3770 | CASE_LABEL (label), buf); |
6de9cd9a | 3771 | else |
d4ee4d25 | 3772 | warning (0, "%Jcase value %qs not in enumerated type %qT", |
8c161995 | 3773 | CASE_LABEL (label), buf, type); |
6de9cd9a DN |
3774 | } |
3775 | ||
3776 | static int | |
3777 | match_case_to_enum (splay_tree_node node, void *data) | |
3778 | { | |
3779 | tree label = (tree) node->value; | |
28dab132 | 3780 | tree type = (tree) data; |
6de9cd9a DN |
3781 | |
3782 | /* Skip default case. */ | |
3783 | if (!CASE_LOW (label)) | |
3784 | return 0; | |
3785 | ||
3786 | /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear | |
3787 | when we did our enum->case scan. Reset our scratch bit after. */ | |
3788 | if (!TREE_ADDRESSABLE (label)) | |
3789 | match_case_to_enum_1 (CASE_LOW (label), type, label); | |
3790 | else | |
3791 | TREE_ADDRESSABLE (label) = 0; | |
3792 | ||
3793 | /* If CASE_HIGH is non-null, we have a range. Here we must search. | |
3794 | Note that the old code in stmt.c did not check for the values in | |
3795 | the range either, just the endpoints. */ | |
3796 | if (CASE_HIGH (label)) | |
3797 | { | |
3798 | tree chain, key = CASE_HIGH (label); | |
3799 | ||
3800 | for (chain = TYPE_VALUES (type); | |
3801 | chain && !tree_int_cst_equal (key, TREE_VALUE (chain)); | |
3802 | chain = TREE_CHAIN (chain)) | |
3803 | continue; | |
3804 | if (!chain) | |
3805 | match_case_to_enum_1 (key, type, label); | |
3806 | } | |
3807 | ||
3808 | return 0; | |
3809 | } | |
3810 | ||
fbc315db ILT |
3811 | /* Handle -Wswitch*. Called from the front end after parsing the |
3812 | switch construct. */ | |
3813 | /* ??? Should probably be somewhere generic, since other languages | |
3814 | besides C and C++ would want this. At the moment, however, C/C++ | |
3815 | are the only tree-ssa languages that support enumerations at all, | |
3816 | so the point is moot. */ | |
6de9cd9a | 3817 | |
fbc315db ILT |
3818 | void |
3819 | c_do_switch_warnings (splay_tree cases, location_t switch_location, | |
3820 | tree type, tree cond) | |
6de9cd9a | 3821 | { |
9f63daea | 3822 | splay_tree_node default_node; |
6de9cd9a DN |
3823 | |
3824 | if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
3825 | return; | |
3826 | ||
6de9cd9a | 3827 | default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); |
44c21c7f DD |
3828 | if (!default_node) |
3829 | warning (OPT_Wswitch_default, "%Hswitch missing default case", | |
3830 | &switch_location); | |
6de9cd9a DN |
3831 | |
3832 | /* If the switch expression was an enumerated type, check that | |
3833 | exactly all enumeration literals are covered by the cases. | |
3834 | The check is made when -Wswitch was specified and there is no | |
3835 | default case, or when -Wswitch-enum was specified. */ | |
3836 | if (((warn_switch && !default_node) || warn_switch_enum) | |
3837 | && type && TREE_CODE (type) == ENUMERAL_TYPE | |
604f5adf | 3838 | && TREE_CODE (cond) != INTEGER_CST) |
6de9cd9a DN |
3839 | { |
3840 | tree chain; | |
3841 | ||
3842 | /* The time complexity here is O(N*lg(N)) worst case, but for the | |
9f63daea | 3843 | common case of monotonically increasing enumerators, it is |
6de9cd9a DN |
3844 | O(N), since the nature of the splay tree will keep the next |
3845 | element adjacent to the root at all times. */ | |
3846 | ||
3847 | for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) | |
3848 | { | |
3849 | splay_tree_node node | |
3850 | = splay_tree_lookup (cases, (splay_tree_key) TREE_VALUE (chain)); | |
201ae393 AP |
3851 | if (!node) |
3852 | { | |
3853 | tree low_value = TREE_VALUE (chain); | |
3854 | splay_tree_node low_bound; | |
3855 | splay_tree_node high_bound; | |
3856 | /* Even though there wasn't an exact match, there might be a | |
3857 | case range which includes the enumator's value. */ | |
3858 | low_bound = splay_tree_predecessor (cases, | |
3859 | (splay_tree_key) low_value); | |
3860 | high_bound = splay_tree_successor (cases, | |
3861 | (splay_tree_key) low_value); | |
3862 | ||
3863 | /* It is smaller than the LOW_VALUE, so there is no need to check | |
3864 | unless the LOW_BOUND is in fact itself a case range. */ | |
3865 | if (low_bound | |
3866 | && CASE_HIGH ((tree) low_bound->value) | |
3867 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
3868 | low_value) >= 0) | |
3869 | node = low_bound; | |
3870 | /* The low end of that range is bigger than the current value. */ | |
3871 | else if (high_bound | |
3872 | && (tree_int_cst_compare ((tree) high_bound->key, | |
3873 | low_value) | |
3874 | <= 0)) | |
3875 | node = high_bound; | |
3876 | } | |
6de9cd9a DN |
3877 | if (node) |
3878 | { | |
3879 | /* Mark the CASE_LOW part of the case entry as seen, so | |
9f63daea | 3880 | that we save time later. Choose TREE_ADDRESSABLE |
6de9cd9a DN |
3881 | randomly as a bit that won't have been set to-date. */ |
3882 | tree label = (tree) node->value; | |
3883 | TREE_ADDRESSABLE (label) = 1; | |
3884 | } | |
3885 | else | |
3886 | { | |
3887 | /* Warn if there are enumerators that don't correspond to | |
3888 | case expressions. */ | |
d4ee4d25 | 3889 | warning (0, "%Henumeration value %qE not handled in switch", |
3c20847b | 3890 | &switch_location, TREE_PURPOSE (chain)); |
6de9cd9a DN |
3891 | } |
3892 | } | |
3893 | ||
3894 | /* Warn if there are case expressions that don't correspond to | |
3895 | enumerators. This can occur since C and C++ don't enforce | |
3896 | type-checking of assignments to enumeration variables. | |
3897 | ||
3898 | The time complexity here is O(N**2) worst case, since we've | |
3899 | not sorted the enumeration values. However, in the absence | |
9f63daea | 3900 | of case ranges this is O(N), since all single cases that |
6de9cd9a DN |
3901 | corresponded to enumerations have been marked above. */ |
3902 | ||
3903 | splay_tree_foreach (cases, match_case_to_enum, type); | |
3904 | } | |
8f17b5c5 MM |
3905 | } |
3906 | ||
6b665219 MM |
3907 | /* Finish an expression taking the address of LABEL (an |
3908 | IDENTIFIER_NODE). Returns an expression for the address. */ | |
15b732b2 | 3909 | |
35b1a6fa AJ |
3910 | tree |
3911 | finish_label_address_expr (tree label) | |
15b732b2 NB |
3912 | { |
3913 | tree result; | |
3914 | ||
3915 | if (pedantic) | |
37fa72e9 | 3916 | pedwarn ("taking the address of a label is non-standard"); |
15b732b2 | 3917 | |
6b665219 MM |
3918 | if (label == error_mark_node) |
3919 | return error_mark_node; | |
3920 | ||
15b732b2 NB |
3921 | label = lookup_label (label); |
3922 | if (label == NULL_TREE) | |
3923 | result = null_pointer_node; | |
3924 | else | |
3925 | { | |
3926 | TREE_USED (label) = 1; | |
3927 | result = build1 (ADDR_EXPR, ptr_type_node, label); | |
15b732b2 NB |
3928 | /* The current function in not necessarily uninlinable. |
3929 | Computed gotos are incompatible with inlining, but the value | |
3930 | here could be used only in a diagnostic, for example. */ | |
3931 | } | |
3932 | ||
3933 | return result; | |
3934 | } | |
3935 | ||
8f17b5c5 | 3936 | /* Hook used by expand_expr to expand language-specific tree codes. */ |
9f63daea | 3937 | /* The only things that should go here are bits needed to expand |
1ea7e6ad | 3938 | constant initializers. Everything else should be handled by the |
6de9cd9a | 3939 | gimplification routines. */ |
8f17b5c5 MM |
3940 | |
3941 | rtx | |
9f63daea | 3942 | c_expand_expr (tree exp, rtx target, enum machine_mode tmode, |
0fab64a3 MM |
3943 | int modifier /* Actually enum_modifier. */, |
3944 | rtx *alt_rtl) | |
8f17b5c5 MM |
3945 | { |
3946 | switch (TREE_CODE (exp)) | |
3947 | { | |
db3acfa5 JM |
3948 | case COMPOUND_LITERAL_EXPR: |
3949 | { | |
3950 | /* Initialize the anonymous variable declared in the compound | |
3951 | literal, then return the variable. */ | |
3952 | tree decl = COMPOUND_LITERAL_EXPR_DECL (exp); | |
3953 | emit_local_var (decl); | |
0fab64a3 | 3954 | return expand_expr_real (decl, target, tmode, modifier, alt_rtl); |
db3acfa5 JM |
3955 | } |
3956 | ||
8f17b5c5 | 3957 | default: |
366de0ce | 3958 | gcc_unreachable (); |
8f17b5c5 | 3959 | } |
8f17b5c5 MM |
3960 | } |
3961 | ||
db3acfa5 JM |
3962 | /* Hook used by staticp to handle language-specific tree codes. */ |
3963 | ||
525c6bf5 | 3964 | tree |
35b1a6fa | 3965 | c_staticp (tree exp) |
db3acfa5 | 3966 | { |
525c6bf5 RH |
3967 | return (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR |
3968 | && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp)) | |
3969 | ? exp : NULL); | |
db3acfa5 | 3970 | } |
19552aa5 JM |
3971 | \f |
3972 | ||
3973 | /* Given a boolean expression ARG, return a tree representing an increment | |
3974 | or decrement (as indicated by CODE) of ARG. The front end must check for | |
3975 | invalid cases (e.g., decrement in C++). */ | |
3976 | tree | |
35b1a6fa | 3977 | boolean_increment (enum tree_code code, tree arg) |
19552aa5 JM |
3978 | { |
3979 | tree val; | |
de7df9eb | 3980 | tree true_res = boolean_true_node; |
37fa72e9 | 3981 | |
19552aa5 JM |
3982 | arg = stabilize_reference (arg); |
3983 | switch (code) | |
3984 | { | |
3985 | case PREINCREMENT_EXPR: | |
53fb4de3 | 3986 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
19552aa5 JM |
3987 | break; |
3988 | case POSTINCREMENT_EXPR: | |
53fb4de3 | 3989 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); |
19552aa5 | 3990 | arg = save_expr (arg); |
53fb4de3 RS |
3991 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
3992 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
19552aa5 JM |
3993 | break; |
3994 | case PREDECREMENT_EXPR: | |
53fb4de3 RS |
3995 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
3996 | invert_truthvalue (arg)); | |
19552aa5 JM |
3997 | break; |
3998 | case POSTDECREMENT_EXPR: | |
53fb4de3 RS |
3999 | val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, |
4000 | invert_truthvalue (arg)); | |
19552aa5 | 4001 | arg = save_expr (arg); |
53fb4de3 RS |
4002 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); |
4003 | val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
19552aa5 JM |
4004 | break; |
4005 | default: | |
366de0ce | 4006 | gcc_unreachable (); |
19552aa5 JM |
4007 | } |
4008 | TREE_SIDE_EFFECTS (val) = 1; | |
4009 | return val; | |
4010 | } | |
03dc0325 | 4011 | \f |
cb60f38d NB |
4012 | /* Built-in macros for stddef.h, that require macros defined in this |
4013 | file. */ | |
460bd0e3 | 4014 | void |
35b1a6fa | 4015 | c_stddef_cpp_builtins(void) |
3df89291 | 4016 | { |
5279d739 ZW |
4017 | builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); |
4018 | builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
4019 | builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
4020 | builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
85291069 JM |
4021 | builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0); |
4022 | builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0); | |
676997cf RH |
4023 | } |
4024 | ||
6431177a | 4025 | static void |
35b1a6fa | 4026 | c_init_attributes (void) |
6431177a JM |
4027 | { |
4028 | /* Fill in the built_in_attributes array. */ | |
4a90aeeb | 4029 | #define DEF_ATTR_NULL_TREE(ENUM) \ |
6431177a | 4030 | built_in_attributes[(int) ENUM] = NULL_TREE; |
4a90aeeb | 4031 | #define DEF_ATTR_INT(ENUM, VALUE) \ |
7d60be94 | 4032 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); |
6431177a JM |
4033 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
4034 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
4035 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
4036 | built_in_attributes[(int) ENUM] \ | |
4037 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
4038 | built_in_attributes[(int) VALUE], \ | |
4039 | built_in_attributes[(int) CHAIN]); | |
6431177a JM |
4040 | #include "builtin-attrs.def" |
4041 | #undef DEF_ATTR_NULL_TREE | |
4042 | #undef DEF_ATTR_INT | |
4043 | #undef DEF_ATTR_IDENT | |
4044 | #undef DEF_ATTR_TREE_LIST | |
03dc0325 | 4045 | } |
26f943fd | 4046 | |
349ae713 NB |
4047 | /* Attribute handlers common to C front ends. */ |
4048 | ||
4049 | /* Handle a "packed" attribute; arguments as in | |
4050 | struct attribute_spec.handler. */ | |
4051 | ||
4052 | static tree | |
e18476eb | 4053 | handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
a742c759 | 4054 | int flags, bool *no_add_attrs) |
349ae713 | 4055 | { |
c6e4cc53 | 4056 | if (TYPE_P (*node)) |
349ae713 NB |
4057 | { |
4058 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
8dd16ecc | 4059 | *node = build_variant_type_copy (*node); |
c6e4cc53 NS |
4060 | TYPE_PACKED (*node) = 1; |
4061 | if (TYPE_MAIN_VARIANT (*node) == *node) | |
4062 | { | |
4063 | /* If it is the main variant, then pack the other variants | |
4064 | too. This happens in, | |
9f63daea | 4065 | |
c6e4cc53 NS |
4066 | struct Foo { |
4067 | struct Foo const *ptr; // creates a variant w/o packed flag | |
646c0835 NS |
4068 | } __ attribute__((packed)); // packs it now. |
4069 | */ | |
c6e4cc53 | 4070 | tree probe; |
9f63daea | 4071 | |
c6e4cc53 NS |
4072 | for (probe = *node; probe; probe = TYPE_NEXT_VARIANT (probe)) |
4073 | TYPE_PACKED (probe) = 1; | |
4074 | } | |
349ae713 NB |
4075 | } |
4076 | else if (TREE_CODE (*node) == FIELD_DECL) | |
646c0835 NS |
4077 | { |
4078 | if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT) | |
4079 | warning (OPT_Wattributes, | |
4080 | "%qE attribute ignored for field of type %qT", | |
4081 | name, TREE_TYPE (*node)); | |
4082 | else | |
4083 | DECL_PACKED (*node) = 1; | |
4084 | } | |
349ae713 | 4085 | /* We can't set DECL_PACKED for a VAR_DECL, because the bit is |
c6e4cc53 NS |
4086 | used for DECL_REGISTER. It wouldn't mean anything anyway. |
4087 | We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
4088 | that changes what the typedef is typing. */ | |
349ae713 NB |
4089 | else |
4090 | { | |
5c498b10 | 4091 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4092 | *no_add_attrs = true; |
4093 | } | |
4094 | ||
4095 | return NULL_TREE; | |
4096 | } | |
4097 | ||
4098 | /* Handle a "nocommon" attribute; arguments as in | |
4099 | struct attribute_spec.handler. */ | |
4100 | ||
4101 | static tree | |
35b1a6fa | 4102 | handle_nocommon_attribute (tree *node, tree name, |
e18476eb BI |
4103 | tree ARG_UNUSED (args), |
4104 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4105 | { |
4106 | if (TREE_CODE (*node) == VAR_DECL) | |
4107 | DECL_COMMON (*node) = 0; | |
4108 | else | |
4109 | { | |
5c498b10 | 4110 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4111 | *no_add_attrs = true; |
4112 | } | |
4113 | ||
4114 | return NULL_TREE; | |
4115 | } | |
4116 | ||
4117 | /* Handle a "common" attribute; arguments as in | |
4118 | struct attribute_spec.handler. */ | |
4119 | ||
4120 | static tree | |
e18476eb BI |
4121 | handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4122 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4123 | { |
4124 | if (TREE_CODE (*node) == VAR_DECL) | |
4125 | DECL_COMMON (*node) = 1; | |
4126 | else | |
4127 | { | |
5c498b10 | 4128 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4129 | *no_add_attrs = true; |
4130 | } | |
4131 | ||
4132 | return NULL_TREE; | |
4133 | } | |
4134 | ||
4135 | /* Handle a "noreturn" attribute; arguments as in | |
4136 | struct attribute_spec.handler. */ | |
4137 | ||
4138 | static tree | |
e18476eb BI |
4139 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4140 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4141 | { |
4142 | tree type = TREE_TYPE (*node); | |
4143 | ||
4144 | /* See FIXME comment in c_common_attribute_table. */ | |
4145 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4146 | TREE_THIS_VOLATILE (*node) = 1; | |
4147 | else if (TREE_CODE (type) == POINTER_TYPE | |
4148 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4149 | TREE_TYPE (*node) | |
4150 | = build_pointer_type | |
4151 | (build_type_variant (TREE_TYPE (type), | |
c29726e2 | 4152 | TYPE_READONLY (TREE_TYPE (type)), 1)); |
349ae713 NB |
4153 | else |
4154 | { | |
5c498b10 | 4155 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4156 | *no_add_attrs = true; |
4157 | } | |
4158 | ||
4159 | return NULL_TREE; | |
4160 | } | |
4161 | ||
4162 | /* Handle a "noinline" attribute; arguments as in | |
4163 | struct attribute_spec.handler. */ | |
4164 | ||
4165 | static tree | |
35b1a6fa | 4166 | handle_noinline_attribute (tree *node, tree name, |
e18476eb BI |
4167 | tree ARG_UNUSED (args), |
4168 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4169 | { |
4170 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4171 | DECL_UNINLINABLE (*node) = 1; | |
4172 | else | |
4173 | { | |
5c498b10 | 4174 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4175 | *no_add_attrs = true; |
4176 | } | |
4177 | ||
4178 | return NULL_TREE; | |
4179 | } | |
4180 | ||
4181 | /* Handle a "always_inline" attribute; arguments as in | |
4182 | struct attribute_spec.handler. */ | |
4183 | ||
4184 | static tree | |
35b1a6fa | 4185 | handle_always_inline_attribute (tree *node, tree name, |
e18476eb BI |
4186 | tree ARG_UNUSED (args), |
4187 | int ARG_UNUSED (flags), | |
a742c759 | 4188 | bool *no_add_attrs) |
349ae713 NB |
4189 | { |
4190 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4191 | { | |
4192 | /* Do nothing else, just set the attribute. We'll get at | |
4193 | it later with lookup_attribute. */ | |
4194 | } | |
4195 | else | |
4196 | { | |
5c498b10 | 4197 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4198 | *no_add_attrs = true; |
4199 | } | |
4200 | ||
4201 | return NULL_TREE; | |
4202 | } | |
4203 | ||
0691d1d4 RG |
4204 | /* Handle a "flatten" attribute; arguments as in |
4205 | struct attribute_spec.handler. */ | |
4206 | ||
4207 | static tree | |
4208 | handle_flatten_attribute (tree *node, tree name, | |
4209 | tree args ATTRIBUTE_UNUSED, | |
4210 | int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) | |
4211 | { | |
4212 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4213 | /* Do nothing else, just set the attribute. We'll get at | |
4214 | it later with lookup_attribute. */ | |
4215 | ; | |
4216 | else | |
4217 | { | |
4218 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4219 | *no_add_attrs = true; | |
4220 | } | |
4221 | ||
4222 | return NULL_TREE; | |
4223 | } | |
4224 | ||
4225 | ||
349ae713 NB |
4226 | /* Handle a "used" attribute; arguments as in |
4227 | struct attribute_spec.handler. */ | |
4228 | ||
4229 | static tree | |
e18476eb BI |
4230 | handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), |
4231 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 | 4232 | { |
d7ddbe24 RH |
4233 | tree node = *pnode; |
4234 | ||
4235 | if (TREE_CODE (node) == FUNCTION_DECL | |
4236 | || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
4d7d0451 | 4237 | { |
4d7d0451 | 4238 | TREE_USED (node) = 1; |
8e3e233b | 4239 | DECL_PRESERVE_P (node) = 1; |
4d7d0451 | 4240 | } |
349ae713 NB |
4241 | else |
4242 | { | |
5c498b10 | 4243 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4244 | *no_add_attrs = true; |
4245 | } | |
4246 | ||
4247 | return NULL_TREE; | |
4248 | } | |
4249 | ||
4250 | /* Handle a "unused" attribute; arguments as in | |
4251 | struct attribute_spec.handler. */ | |
4252 | ||
4253 | static tree | |
e18476eb BI |
4254 | handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4255 | int flags, bool *no_add_attrs) | |
349ae713 NB |
4256 | { |
4257 | if (DECL_P (*node)) | |
4258 | { | |
4259 | tree decl = *node; | |
4260 | ||
4261 | if (TREE_CODE (decl) == PARM_DECL | |
4262 | || TREE_CODE (decl) == VAR_DECL | |
4263 | || TREE_CODE (decl) == FUNCTION_DECL | |
4264 | || TREE_CODE (decl) == LABEL_DECL | |
4265 | || TREE_CODE (decl) == TYPE_DECL) | |
4266 | TREE_USED (decl) = 1; | |
4267 | else | |
4268 | { | |
5c498b10 | 4269 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4270 | *no_add_attrs = true; |
4271 | } | |
4272 | } | |
4273 | else | |
4274 | { | |
4275 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
8dd16ecc | 4276 | *node = build_variant_type_copy (*node); |
349ae713 NB |
4277 | TREE_USED (*node) = 1; |
4278 | } | |
4279 | ||
4280 | return NULL_TREE; | |
4281 | } | |
4282 | ||
ce91e74c JH |
4283 | /* Handle a "externally_visible" attribute; arguments as in |
4284 | struct attribute_spec.handler. */ | |
4285 | ||
4286 | static tree | |
4287 | handle_externally_visible_attribute (tree *pnode, tree name, | |
4288 | tree ARG_UNUSED (args), | |
4289 | int ARG_UNUSED (flags), | |
4290 | bool *no_add_attrs) | |
4291 | { | |
4292 | tree node = *pnode; | |
4293 | ||
4294 | if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL) | |
4295 | || !TREE_PUBLIC (node)) | |
4296 | { | |
4297 | warning (OPT_Wattributes, | |
4298 | "%qE attribute have effect only on public objects", name); | |
4299 | *no_add_attrs = true; | |
4300 | } | |
4301 | else if (TREE_CODE (node) == FUNCTION_DECL) | |
4302 | { | |
4303 | struct cgraph_node *n = cgraph_node (node); | |
4304 | n->local.externally_visible = true; | |
4305 | if (n->local.finalized) | |
4306 | cgraph_mark_needed_node (n); | |
4307 | } | |
4308 | else if (TREE_CODE (node) == VAR_DECL) | |
4309 | { | |
4310 | struct cgraph_varpool_node *n = cgraph_varpool_node (node); | |
4311 | n->externally_visible = true; | |
4312 | if (n->finalized) | |
4313 | cgraph_varpool_mark_needed_node (n); | |
4314 | } | |
4315 | else | |
4316 | { | |
4317 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
4318 | *no_add_attrs = true; | |
4319 | } | |
4320 | ||
4321 | return NULL_TREE; | |
4322 | } | |
4323 | ||
349ae713 NB |
4324 | /* Handle a "const" attribute; arguments as in |
4325 | struct attribute_spec.handler. */ | |
4326 | ||
4327 | static tree | |
e18476eb BI |
4328 | handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4329 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4330 | { |
4331 | tree type = TREE_TYPE (*node); | |
4332 | ||
4333 | /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
4334 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4335 | TREE_READONLY (*node) = 1; | |
4336 | else if (TREE_CODE (type) == POINTER_TYPE | |
4337 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4338 | TREE_TYPE (*node) | |
4339 | = build_pointer_type | |
4340 | (build_type_variant (TREE_TYPE (type), 1, | |
4341 | TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
4342 | else | |
4343 | { | |
5c498b10 | 4344 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4345 | *no_add_attrs = true; |
4346 | } | |
4347 | ||
4348 | return NULL_TREE; | |
4349 | } | |
4350 | ||
4351 | /* Handle a "transparent_union" attribute; arguments as in | |
4352 | struct attribute_spec.handler. */ | |
4353 | ||
4354 | static tree | |
35b1a6fa | 4355 | handle_transparent_union_attribute (tree *node, tree name, |
e18476eb | 4356 | tree ARG_UNUSED (args), int flags, |
a742c759 | 4357 | bool *no_add_attrs) |
349ae713 | 4358 | { |
52dd234b RH |
4359 | tree type = NULL; |
4360 | ||
4361 | *no_add_attrs = true; | |
349ae713 NB |
4362 | |
4363 | if (DECL_P (*node)) | |
4364 | { | |
52dd234b RH |
4365 | if (TREE_CODE (*node) != TYPE_DECL) |
4366 | goto ignored; | |
4367 | node = &TREE_TYPE (*node); | |
4368 | type = *node; | |
349ae713 NB |
4369 | } |
4370 | else if (TYPE_P (*node)) | |
52dd234b RH |
4371 | type = *node; |
4372 | else | |
4373 | goto ignored; | |
349ae713 | 4374 | |
52dd234b | 4375 | if (TREE_CODE (type) == UNION_TYPE) |
349ae713 | 4376 | { |
52dd234b RH |
4377 | /* When IN_PLACE is set, leave the check for FIELDS and MODE to |
4378 | the code in finish_struct. */ | |
349ae713 | 4379 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) |
52dd234b RH |
4380 | { |
4381 | if (TYPE_FIELDS (type) == NULL_TREE | |
4382 | || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type))) | |
4383 | goto ignored; | |
4384 | ||
4385 | /* A type variant isn't good enough, since we don't a cast | |
4386 | to such a type removed as a no-op. */ | |
4387 | *node = type = build_duplicate_type (type); | |
4388 | } | |
4389 | ||
4390 | TYPE_TRANSPARENT_UNION (type) = 1; | |
4391 | return NULL_TREE; | |
349ae713 NB |
4392 | } |
4393 | ||
52dd234b RH |
4394 | ignored: |
4395 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
349ae713 NB |
4396 | return NULL_TREE; |
4397 | } | |
4398 | ||
4399 | /* Handle a "constructor" attribute; arguments as in | |
4400 | struct attribute_spec.handler. */ | |
4401 | ||
4402 | static tree | |
35b1a6fa | 4403 | handle_constructor_attribute (tree *node, tree name, |
e18476eb BI |
4404 | tree ARG_UNUSED (args), |
4405 | int ARG_UNUSED (flags), | |
a742c759 | 4406 | bool *no_add_attrs) |
349ae713 NB |
4407 | { |
4408 | tree decl = *node; | |
4409 | tree type = TREE_TYPE (decl); | |
4410 | ||
4411 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4412 | && TREE_CODE (type) == FUNCTION_TYPE | |
4413 | && decl_function_context (decl) == 0) | |
4414 | { | |
4415 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
4416 | TREE_USED (decl) = 1; | |
4417 | } | |
4418 | else | |
4419 | { | |
5c498b10 | 4420 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4421 | *no_add_attrs = true; |
4422 | } | |
4423 | ||
4424 | return NULL_TREE; | |
4425 | } | |
4426 | ||
4427 | /* Handle a "destructor" attribute; arguments as in | |
4428 | struct attribute_spec.handler. */ | |
4429 | ||
4430 | static tree | |
35b1a6fa | 4431 | handle_destructor_attribute (tree *node, tree name, |
e18476eb BI |
4432 | tree ARG_UNUSED (args), |
4433 | int ARG_UNUSED (flags), | |
a742c759 | 4434 | bool *no_add_attrs) |
349ae713 NB |
4435 | { |
4436 | tree decl = *node; | |
4437 | tree type = TREE_TYPE (decl); | |
4438 | ||
4439 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4440 | && TREE_CODE (type) == FUNCTION_TYPE | |
4441 | && decl_function_context (decl) == 0) | |
4442 | { | |
4443 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
4444 | TREE_USED (decl) = 1; | |
4445 | } | |
4446 | else | |
4447 | { | |
5c498b10 | 4448 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4449 | *no_add_attrs = true; |
4450 | } | |
4451 | ||
4452 | return NULL_TREE; | |
4453 | } | |
4454 | ||
4455 | /* Handle a "mode" attribute; arguments as in | |
4456 | struct attribute_spec.handler. */ | |
4457 | ||
4458 | static tree | |
e18476eb BI |
4459 | handle_mode_attribute (tree *node, tree name, tree args, |
4460 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4461 | { |
4462 | tree type = *node; | |
4463 | ||
4464 | *no_add_attrs = true; | |
4465 | ||
4466 | if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) | |
5c498b10 | 4467 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4468 | else |
4469 | { | |
4470 | int j; | |
4471 | const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); | |
4472 | int len = strlen (p); | |
4473 | enum machine_mode mode = VOIDmode; | |
4474 | tree typefm; | |
6dd53648 | 4475 | bool valid_mode; |
349ae713 NB |
4476 | |
4477 | if (len > 4 && p[0] == '_' && p[1] == '_' | |
4478 | && p[len - 1] == '_' && p[len - 2] == '_') | |
4479 | { | |
28dab132 | 4480 | char *newp = (char *) alloca (len - 1); |
349ae713 NB |
4481 | |
4482 | strcpy (newp, &p[2]); | |
4483 | newp[len - 4] = '\0'; | |
4484 | p = newp; | |
4485 | } | |
4486 | ||
4487 | /* Change this type to have a type with the specified mode. | |
4488 | First check for the special modes. */ | |
3f75a254 | 4489 | if (!strcmp (p, "byte")) |
349ae713 NB |
4490 | mode = byte_mode; |
4491 | else if (!strcmp (p, "word")) | |
4492 | mode = word_mode; | |
3f75a254 | 4493 | else if (!strcmp (p, "pointer")) |
349ae713 NB |
4494 | mode = ptr_mode; |
4495 | else | |
4496 | for (j = 0; j < NUM_MACHINE_MODES; j++) | |
4497 | if (!strcmp (p, GET_MODE_NAME (j))) | |
61f03aba RH |
4498 | { |
4499 | mode = (enum machine_mode) j; | |
4500 | break; | |
4501 | } | |
349ae713 NB |
4502 | |
4503 | if (mode == VOIDmode) | |
4a5eab38 | 4504 | { |
9e637a26 | 4505 | error ("unknown machine mode %qs", p); |
4a5eab38 PB |
4506 | return NULL_TREE; |
4507 | } | |
4508 | ||
6dd53648 RH |
4509 | valid_mode = false; |
4510 | switch (GET_MODE_CLASS (mode)) | |
4a5eab38 | 4511 | { |
6dd53648 RH |
4512 | case MODE_INT: |
4513 | case MODE_PARTIAL_INT: | |
4514 | case MODE_FLOAT: | |
4515 | valid_mode = targetm.scalar_mode_supported_p (mode); | |
4516 | break; | |
4517 | ||
4518 | case MODE_COMPLEX_INT: | |
4519 | case MODE_COMPLEX_FLOAT: | |
4520 | valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); | |
4521 | break; | |
4522 | ||
4523 | case MODE_VECTOR_INT: | |
4524 | case MODE_VECTOR_FLOAT: | |
5c498b10 DD |
4525 | warning (OPT_Wattributes, "specifying vector types with " |
4526 | "__attribute__ ((mode)) is deprecated"); | |
4527 | warning (OPT_Wattributes, | |
4528 | "use __attribute__ ((vector_size)) instead"); | |
6dd53648 RH |
4529 | valid_mode = vector_mode_valid_p (mode); |
4530 | break; | |
4a5eab38 | 4531 | |
6dd53648 RH |
4532 | default: |
4533 | break; | |
4534 | } | |
4535 | if (!valid_mode) | |
4536 | { | |
9e637a26 | 4537 | error ("unable to emulate %qs", p); |
6dd53648 RH |
4538 | return NULL_TREE; |
4539 | } | |
4a5eab38 | 4540 | |
6dd53648 | 4541 | if (POINTER_TYPE_P (type)) |
cb2a532e | 4542 | { |
6dd53648 RH |
4543 | tree (*fn)(tree, enum machine_mode, bool); |
4544 | ||
4545 | if (!targetm.valid_pointer_mode (mode)) | |
cb2a532e | 4546 | { |
9e637a26 | 4547 | error ("invalid pointer mode %qs", p); |
cb2a532e AH |
4548 | return NULL_TREE; |
4549 | } | |
4550 | ||
6dd53648 RH |
4551 | if (TREE_CODE (type) == POINTER_TYPE) |
4552 | fn = build_pointer_type_for_mode; | |
4977bab6 | 4553 | else |
6dd53648 RH |
4554 | fn = build_reference_type_for_mode; |
4555 | typefm = fn (TREE_TYPE (type), mode, false); | |
cb2a532e | 4556 | } |
6dd53648 RH |
4557 | else |
4558 | typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type)); | |
ec8465a5 | 4559 | |
6dd53648 RH |
4560 | if (typefm == NULL_TREE) |
4561 | { | |
61f03aba | 4562 | error ("no data type for mode %qs", p); |
6dd53648 RH |
4563 | return NULL_TREE; |
4564 | } | |
ec8465a5 RK |
4565 | else if (TREE_CODE (type) == ENUMERAL_TYPE) |
4566 | { | |
4567 | /* For enumeral types, copy the precision from the integer | |
4568 | type returned above. If not an INTEGER_TYPE, we can't use | |
4569 | this mode for this type. */ | |
4570 | if (TREE_CODE (typefm) != INTEGER_TYPE) | |
4571 | { | |
61f03aba | 4572 | error ("cannot use mode %qs for enumeral types", p); |
ec8465a5 RK |
4573 | return NULL_TREE; |
4574 | } | |
4575 | ||
99db1ef0 RH |
4576 | if (flags & ATTR_FLAG_TYPE_IN_PLACE) |
4577 | { | |
4578 | TYPE_PRECISION (type) = TYPE_PRECISION (typefm); | |
4579 | typefm = type; | |
4580 | } | |
4581 | else | |
4582 | { | |
4583 | /* We cannot build a type variant, as there's code that assumes | |
4584 | that TYPE_MAIN_VARIANT has the same mode. This includes the | |
4585 | debug generators. Instead, create a subrange type. This | |
4586 | results in all of the enumeral values being emitted only once | |
4587 | in the original, and the subtype gets them by reference. */ | |
4588 | if (TYPE_UNSIGNED (type)) | |
4589 | typefm = make_unsigned_type (TYPE_PRECISION (typefm)); | |
4590 | else | |
4591 | typefm = make_signed_type (TYPE_PRECISION (typefm)); | |
4592 | TREE_TYPE (typefm) = type; | |
4593 | } | |
ec8465a5 | 4594 | } |
a2d36602 RH |
4595 | else if (VECTOR_MODE_P (mode) |
4596 | ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) | |
4597 | : TREE_CODE (type) != TREE_CODE (typefm)) | |
61f03aba RH |
4598 | { |
4599 | error ("mode %qs applied to inappropriate type", p); | |
4600 | return NULL_TREE; | |
4601 | } | |
4602 | ||
6dd53648 | 4603 | *node = typefm; |
349ae713 NB |
4604 | } |
4605 | ||
4606 | return NULL_TREE; | |
4607 | } | |
4608 | ||
4609 | /* Handle a "section" attribute; arguments as in | |
4610 | struct attribute_spec.handler. */ | |
4611 | ||
4612 | static tree | |
e18476eb BI |
4613 | handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
4614 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
4615 | { |
4616 | tree decl = *node; | |
4617 | ||
4618 | if (targetm.have_named_sections) | |
4619 | { | |
9fb32434 CT |
4620 | user_defined_section_attribute = true; |
4621 | ||
349ae713 NB |
4622 | if ((TREE_CODE (decl) == FUNCTION_DECL |
4623 | || TREE_CODE (decl) == VAR_DECL) | |
4624 | && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
4625 | { | |
4626 | if (TREE_CODE (decl) == VAR_DECL | |
4627 | && current_function_decl != NULL_TREE | |
3f75a254 | 4628 | && !TREE_STATIC (decl)) |
349ae713 | 4629 | { |
ddd2d57e | 4630 | error ("%Jsection attribute cannot be specified for " |
6de9cd9a | 4631 | "local variables", decl); |
349ae713 NB |
4632 | *no_add_attrs = true; |
4633 | } | |
4634 | ||
4635 | /* The decl may have already been given a section attribute | |
4636 | from a previous declaration. Ensure they match. */ | |
4637 | else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
4638 | && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
4639 | TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
4640 | { | |
dee15844 JM |
4641 | error ("section of %q+D conflicts with previous declaration", |
4642 | *node); | |
349ae713 NB |
4643 | *no_add_attrs = true; |
4644 | } | |
4645 | else | |
4646 | DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
4647 | } | |
4648 | else | |
4649 | { | |
dee15844 | 4650 | error ("section attribute not allowed for %q+D", *node); |
349ae713 NB |
4651 | *no_add_attrs = true; |
4652 | } | |
4653 | } | |
4654 | else | |
4655 | { | |
ddd2d57e | 4656 | error ("%Jsection attributes are not supported for this target", *node); |
349ae713 NB |
4657 | *no_add_attrs = true; |
4658 | } | |
4659 | ||
4660 | return NULL_TREE; | |
4661 | } | |
4662 | ||
4663 | /* Handle a "aligned" attribute; arguments as in | |
4664 | struct attribute_spec.handler. */ | |
4665 | ||
4666 | static tree | |
e18476eb | 4667 | handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
a742c759 | 4668 | int flags, bool *no_add_attrs) |
349ae713 NB |
4669 | { |
4670 | tree decl = NULL_TREE; | |
4671 | tree *type = NULL; | |
4672 | int is_type = 0; | |
4673 | tree align_expr = (args ? TREE_VALUE (args) | |
4674 | : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
4675 | int i; | |
4676 | ||
4677 | if (DECL_P (*node)) | |
4678 | { | |
4679 | decl = *node; | |
4680 | type = &TREE_TYPE (decl); | |
4681 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4682 | } | |
4683 | else if (TYPE_P (*node)) | |
4684 | type = node, is_type = 1; | |
4685 | ||
349ae713 NB |
4686 | if (TREE_CODE (align_expr) != INTEGER_CST) |
4687 | { | |
4688 | error ("requested alignment is not a constant"); | |
4689 | *no_add_attrs = true; | |
4690 | } | |
4691 | else if ((i = tree_log2 (align_expr)) == -1) | |
4692 | { | |
4693 | error ("requested alignment is not a power of 2"); | |
4694 | *no_add_attrs = true; | |
4695 | } | |
4696 | else if (i > HOST_BITS_PER_INT - 2) | |
4697 | { | |
4698 | error ("requested alignment is too large"); | |
4699 | *no_add_attrs = true; | |
4700 | } | |
4701 | else if (is_type) | |
4702 | { | |
4703 | /* If we have a TYPE_DECL, then copy the type, so that we | |
4704 | don't accidentally modify a builtin type. See pushdecl. */ | |
4705 | if (decl && TREE_TYPE (decl) != error_mark_node | |
4706 | && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
4707 | { | |
4708 | tree tt = TREE_TYPE (decl); | |
8dd16ecc | 4709 | *type = build_variant_type_copy (*type); |
349ae713 NB |
4710 | DECL_ORIGINAL_TYPE (decl) = tt; |
4711 | TYPE_NAME (*type) = decl; | |
4712 | TREE_USED (*type) = TREE_USED (decl); | |
4713 | TREE_TYPE (decl) = *type; | |
4714 | } | |
4715 | else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
8dd16ecc | 4716 | *type = build_variant_type_copy (*type); |
349ae713 NB |
4717 | |
4718 | TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT; | |
4719 | TYPE_USER_ALIGN (*type) = 1; | |
4720 | } | |
4721 | else if (TREE_CODE (decl) != VAR_DECL | |
4722 | && TREE_CODE (decl) != FIELD_DECL) | |
4723 | { | |
dee15844 | 4724 | error ("alignment may not be specified for %q+D", decl); |
349ae713 NB |
4725 | *no_add_attrs = true; |
4726 | } | |
4727 | else | |
4728 | { | |
4729 | DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT; | |
4730 | DECL_USER_ALIGN (decl) = 1; | |
4731 | } | |
4732 | ||
4733 | return NULL_TREE; | |
4734 | } | |
4735 | ||
4736 | /* Handle a "weak" attribute; arguments as in | |
4737 | struct attribute_spec.handler. */ | |
4738 | ||
4739 | static tree | |
e18476eb BI |
4740 | handle_weak_attribute (tree *node, tree ARG_UNUSED (name), |
4741 | tree ARG_UNUSED (args), | |
4742 | int ARG_UNUSED (flags), | |
4743 | bool * ARG_UNUSED (no_add_attrs)) | |
349ae713 NB |
4744 | { |
4745 | declare_weak (*node); | |
4746 | ||
4747 | return NULL_TREE; | |
4748 | } | |
4749 | ||
4750 | /* Handle an "alias" attribute; arguments as in | |
4751 | struct attribute_spec.handler. */ | |
4752 | ||
4753 | static tree | |
35b1a6fa | 4754 | handle_alias_attribute (tree *node, tree name, tree args, |
e18476eb | 4755 | int ARG_UNUSED (flags), bool *no_add_attrs) |
349ae713 NB |
4756 | { |
4757 | tree decl = *node; | |
4758 | ||
4759 | if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
3f75a254 | 4760 | || (TREE_CODE (decl) != FUNCTION_DECL && !DECL_EXTERNAL (decl))) |
349ae713 | 4761 | { |
dee15844 | 4762 | error ("%q+D defined both normally and as an alias", decl); |
349ae713 NB |
4763 | *no_add_attrs = true; |
4764 | } | |
f6a76b9f RH |
4765 | |
4766 | /* Note that the very first time we process a nested declaration, | |
4767 | decl_function_context will not be set. Indeed, *would* never | |
4768 | be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
4769 | we do below. After such frobbery, pushdecl would set the context. | |
4770 | In any case, this is never what we want. */ | |
4771 | else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
349ae713 NB |
4772 | { |
4773 | tree id; | |
4774 | ||
4775 | id = TREE_VALUE (args); | |
4776 | if (TREE_CODE (id) != STRING_CST) | |
4777 | { | |
40b97a2e | 4778 | error ("alias argument not a string"); |
349ae713 NB |
4779 | *no_add_attrs = true; |
4780 | return NULL_TREE; | |
4781 | } | |
4782 | id = get_identifier (TREE_STRING_POINTER (id)); | |
4783 | /* This counts as a use of the object pointed to. */ | |
4784 | TREE_USED (id) = 1; | |
4785 | ||
4786 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
4787 | DECL_INITIAL (decl) = error_mark_node; | |
4788 | else | |
6de9cd9a | 4789 | { |
a0203ca7 AO |
4790 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))) |
4791 | DECL_EXTERNAL (decl) = 1; | |
4792 | else | |
4793 | DECL_EXTERNAL (decl) = 0; | |
6de9cd9a DN |
4794 | TREE_STATIC (decl) = 1; |
4795 | } | |
349ae713 NB |
4796 | } |
4797 | else | |
4798 | { | |
5c498b10 | 4799 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
4800 | *no_add_attrs = true; |
4801 | } | |
4802 | ||
4803 | return NULL_TREE; | |
4804 | } | |
4805 | ||
a0203ca7 AO |
4806 | /* Handle a "weakref" attribute; arguments as in struct |
4807 | attribute_spec.handler. */ | |
4808 | ||
4809 | static tree | |
4810 | handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
4811 | int flags, bool *no_add_attrs) | |
4812 | { | |
4813 | tree attr = NULL_TREE; | |
4814 | ||
4815 | /* The idea here is that `weakref("name")' mutates into `weakref, | |
4816 | alias("name")', and weakref without arguments, in turn, | |
4817 | implicitly adds weak. */ | |
4818 | ||
4819 | if (args) | |
4820 | { | |
4821 | attr = tree_cons (get_identifier ("alias"), args, attr); | |
4822 | attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); | |
4823 | ||
4824 | *no_add_attrs = true; | |
4825 | } | |
4826 | else | |
4827 | { | |
4828 | if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) | |
4829 | error ("%Jweakref attribute must appear before alias attribute", | |
4830 | *node); | |
4831 | ||
4832 | attr = tree_cons (get_identifier ("weak"), NULL_TREE, attr); | |
4833 | } | |
4834 | ||
4835 | decl_attributes (node, attr, flags); | |
4836 | ||
4837 | return NULL_TREE; | |
4838 | } | |
4839 | ||
349ae713 NB |
4840 | /* Handle an "visibility" attribute; arguments as in |
4841 | struct attribute_spec.handler. */ | |
4842 | ||
4843 | static tree | |
35b1a6fa | 4844 | handle_visibility_attribute (tree *node, tree name, tree args, |
e18476eb | 4845 | int ARG_UNUSED (flags), |
a742c759 | 4846 | bool *no_add_attrs) |
349ae713 NB |
4847 | { |
4848 | tree decl = *node; | |
968b41a1 MA |
4849 | tree id = TREE_VALUE (args); |
4850 | ||
4851 | *no_add_attrs = true; | |
349ae713 | 4852 | |
d7afec4b ND |
4853 | if (TYPE_P (*node)) |
4854 | { | |
4855 | if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) | |
4856 | { | |
5c498b10 DD |
4857 | warning (OPT_Wattributes, "%qE attribute ignored on non-class types", |
4858 | name); | |
d7afec4b ND |
4859 | return NULL_TREE; |
4860 | } | |
4861 | } | |
3f75a254 | 4862 | else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) |
349ae713 | 4863 | { |
5c498b10 | 4864 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
968b41a1 | 4865 | return NULL_TREE; |
349ae713 | 4866 | } |
349ae713 | 4867 | |
968b41a1 MA |
4868 | if (TREE_CODE (id) != STRING_CST) |
4869 | { | |
40b97a2e | 4870 | error ("visibility argument not a string"); |
968b41a1 | 4871 | return NULL_TREE; |
349ae713 | 4872 | } |
9f63daea | 4873 | |
d7afec4b ND |
4874 | /* If this is a type, set the visibility on the type decl. */ |
4875 | if (TYPE_P (decl)) | |
4876 | { | |
4877 | decl = TYPE_NAME (decl); | |
3f75a254 | 4878 | if (!decl) |
d7afec4b | 4879 | return NULL_TREE; |
e8233ac2 AP |
4880 | if (TREE_CODE (decl) == IDENTIFIER_NODE) |
4881 | { | |
5c498b10 | 4882 | warning (OPT_Wattributes, "%qE attribute ignored on types", |
e8233ac2 AP |
4883 | name); |
4884 | return NULL_TREE; | |
4885 | } | |
d7afec4b | 4886 | } |
349ae713 | 4887 | |
968b41a1 MA |
4888 | if (strcmp (TREE_STRING_POINTER (id), "default") == 0) |
4889 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
4890 | else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) | |
4891 | DECL_VISIBILITY (decl) = VISIBILITY_INTERNAL; | |
4892 | else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) | |
9f63daea | 4893 | DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; |
968b41a1 MA |
4894 | else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) |
4895 | DECL_VISIBILITY (decl) = VISIBILITY_PROTECTED; | |
4896 | else | |
40b97a2e | 4897 | error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); |
d7afec4b ND |
4898 | DECL_VISIBILITY_SPECIFIED (decl) = 1; |
4899 | ||
4900 | /* For decls only, go ahead and attach the attribute to the node as well. | |
4901 | This is needed so we can determine whether we have VISIBILITY_DEFAULT | |
4902 | because the visibility was not specified, or because it was explicitly | |
4903 | overridden from the class visibility. */ | |
4904 | if (DECL_P (*node)) | |
4905 | *no_add_attrs = false; | |
968b41a1 | 4906 | |
349ae713 NB |
4907 | return NULL_TREE; |
4908 | } | |
4909 | ||
b2ca3702 MM |
4910 | /* Determine the ELF symbol visibility for DECL, which is either a |
4911 | variable or a function. It is an error to use this function if a | |
4912 | definition of DECL is not available in this translation unit. | |
4913 | Returns true if the final visibility has been determined by this | |
4914 | function; false if the caller is free to make additional | |
4915 | modifications. */ | |
4916 | ||
4917 | bool | |
4918 | c_determine_visibility (tree decl) | |
4919 | { | |
4094f4d2 NS |
4920 | gcc_assert (TREE_CODE (decl) == VAR_DECL |
4921 | || TREE_CODE (decl) == FUNCTION_DECL); | |
b2ca3702 MM |
4922 | |
4923 | /* If the user explicitly specified the visibility with an | |
4924 | attribute, honor that. DECL_VISIBILITY will have been set during | |
4925 | the processing of the attribute. We check for an explicit | |
4926 | attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, | |
4927 | to distinguish the use of an attribute from the use of a "#pragma | |
4928 | GCC visibility push(...)"; in the latter case we still want other | |
4929 | considerations to be able to overrule the #pragma. */ | |
4930 | if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))) | |
4931 | return true; | |
4932 | ||
4933 | /* Anything that is exported must have default visibility. */ | |
4934 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
4935 | && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) | |
4936 | { | |
4937 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
4938 | DECL_VISIBILITY_SPECIFIED (decl) = 1; | |
4939 | return true; | |
4940 | } | |
4941 | ||
4942 | return false; | |
4943 | } | |
4944 | ||
dce81a1a JJ |
4945 | /* Handle an "tls_model" attribute; arguments as in |
4946 | struct attribute_spec.handler. */ | |
4947 | ||
4948 | static tree | |
35b1a6fa | 4949 | handle_tls_model_attribute (tree *node, tree name, tree args, |
e18476eb | 4950 | int ARG_UNUSED (flags), bool *no_add_attrs) |
dce81a1a | 4951 | { |
c2f7fa15 | 4952 | tree id; |
dce81a1a | 4953 | tree decl = *node; |
c2f7fa15 | 4954 | enum tls_model kind; |
dce81a1a | 4955 | |
c2f7fa15 SB |
4956 | *no_add_attrs = true; |
4957 | ||
4958 | if (!DECL_THREAD_LOCAL_P (decl)) | |
dce81a1a | 4959 | { |
5c498b10 | 4960 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
c2f7fa15 | 4961 | return NULL_TREE; |
dce81a1a | 4962 | } |
dce81a1a | 4963 | |
c2f7fa15 SB |
4964 | kind = DECL_TLS_MODEL (decl); |
4965 | id = TREE_VALUE (args); | |
4966 | if (TREE_CODE (id) != STRING_CST) | |
4967 | { | |
4968 | error ("tls_model argument not a string"); | |
4969 | return NULL_TREE; | |
dce81a1a JJ |
4970 | } |
4971 | ||
c2f7fa15 SB |
4972 | if (!strcmp (TREE_STRING_POINTER (id), "local-exec")) |
4973 | kind = TLS_MODEL_LOCAL_EXEC; | |
4974 | else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec")) | |
4975 | kind = TLS_MODEL_INITIAL_EXEC; | |
4976 | else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic")) | |
4977 | kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; | |
4978 | else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
4979 | kind = TLS_MODEL_GLOBAL_DYNAMIC; | |
4980 | else | |
4981 | error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
4982 | ||
4983 | DECL_TLS_MODEL (decl) = kind; | |
dce81a1a JJ |
4984 | return NULL_TREE; |
4985 | } | |
4986 | ||
349ae713 NB |
4987 | /* Handle a "no_instrument_function" attribute; arguments as in |
4988 | struct attribute_spec.handler. */ | |
4989 | ||
4990 | static tree | |
35b1a6fa | 4991 | handle_no_instrument_function_attribute (tree *node, tree name, |
e18476eb BI |
4992 | tree ARG_UNUSED (args), |
4993 | int ARG_UNUSED (flags), | |
a742c759 | 4994 | bool *no_add_attrs) |
349ae713 NB |
4995 | { |
4996 | tree decl = *node; | |
4997 | ||
4998 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
4999 | { | |
bda67431 | 5000 | error ("%J%qE attribute applies only to functions", decl, name); |
349ae713 NB |
5001 | *no_add_attrs = true; |
5002 | } | |
5003 | else if (DECL_INITIAL (decl)) | |
5004 | { | |
bda67431 | 5005 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
349ae713 NB |
5006 | *no_add_attrs = true; |
5007 | } | |
5008 | else | |
5009 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
5010 | ||
5011 | return NULL_TREE; | |
5012 | } | |
5013 | ||
5014 | /* Handle a "malloc" attribute; arguments as in | |
5015 | struct attribute_spec.handler. */ | |
5016 | ||
5017 | static tree | |
e18476eb BI |
5018 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5019 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 | 5020 | { |
3425638a JM |
5021 | if (TREE_CODE (*node) == FUNCTION_DECL |
5022 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
349ae713 | 5023 | DECL_IS_MALLOC (*node) = 1; |
349ae713 NB |
5024 | else |
5025 | { | |
5c498b10 | 5026 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
5027 | *no_add_attrs = true; |
5028 | } | |
5029 | ||
5030 | return NULL_TREE; | |
5031 | } | |
5032 | ||
6e9a3221 AN |
5033 | /* Handle a "returns_twice" attribute; arguments as in |
5034 | struct attribute_spec.handler. */ | |
5035 | ||
5036 | static tree | |
5037 | handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5038 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5039 | { | |
5040 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5041 | DECL_IS_RETURNS_TWICE (*node) = 1; | |
5042 | else | |
5043 | { | |
5c498b10 | 5044 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
6e9a3221 AN |
5045 | *no_add_attrs = true; |
5046 | } | |
5047 | ||
5048 | return NULL_TREE; | |
5049 | } | |
5050 | ||
349ae713 NB |
5051 | /* Handle a "no_limit_stack" attribute; arguments as in |
5052 | struct attribute_spec.handler. */ | |
5053 | ||
5054 | static tree | |
35b1a6fa | 5055 | handle_no_limit_stack_attribute (tree *node, tree name, |
e18476eb BI |
5056 | tree ARG_UNUSED (args), |
5057 | int ARG_UNUSED (flags), | |
a742c759 | 5058 | bool *no_add_attrs) |
349ae713 NB |
5059 | { |
5060 | tree decl = *node; | |
5061 | ||
5062 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
5063 | { | |
bda67431 | 5064 | error ("%J%qE attribute applies only to functions", decl, name); |
349ae713 NB |
5065 | *no_add_attrs = true; |
5066 | } | |
5067 | else if (DECL_INITIAL (decl)) | |
5068 | { | |
bda67431 | 5069 | error ("%Jcan%'t set %qE attribute after definition", decl, name); |
349ae713 NB |
5070 | *no_add_attrs = true; |
5071 | } | |
5072 | else | |
5073 | DECL_NO_LIMIT_STACK (decl) = 1; | |
5074 | ||
5075 | return NULL_TREE; | |
5076 | } | |
5077 | ||
5078 | /* Handle a "pure" attribute; arguments as in | |
5079 | struct attribute_spec.handler. */ | |
5080 | ||
5081 | static tree | |
e18476eb BI |
5082 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5083 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
349ae713 NB |
5084 | { |
5085 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5086 | DECL_IS_PURE (*node) = 1; | |
5087 | /* ??? TODO: Support types. */ | |
5088 | else | |
5089 | { | |
5c498b10 | 5090 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
5091 | *no_add_attrs = true; |
5092 | } | |
5093 | ||
5094 | return NULL_TREE; | |
5095 | } | |
5096 | ||
dcd6de6d ZD |
5097 | /* Handle a "no vops" attribute; arguments as in |
5098 | struct attribute_spec.handler. */ | |
5099 | ||
5100 | static tree | |
5101 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
5102 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5103 | bool *ARG_UNUSED (no_add_attrs)) | |
5104 | { | |
5105 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
5106 | DECL_IS_NOVOPS (*node) = 1; | |
5107 | return NULL_TREE; | |
5108 | } | |
5109 | ||
349ae713 NB |
5110 | /* Handle a "deprecated" attribute; arguments as in |
5111 | struct attribute_spec.handler. */ | |
35b1a6fa | 5112 | |
349ae713 | 5113 | static tree |
35b1a6fa | 5114 | handle_deprecated_attribute (tree *node, tree name, |
e18476eb | 5115 | tree ARG_UNUSED (args), int flags, |
a742c759 | 5116 | bool *no_add_attrs) |
349ae713 NB |
5117 | { |
5118 | tree type = NULL_TREE; | |
5119 | int warn = 0; | |
c51a1ba9 | 5120 | tree what = NULL_TREE; |
35b1a6fa | 5121 | |
349ae713 NB |
5122 | if (DECL_P (*node)) |
5123 | { | |
5124 | tree decl = *node; | |
5125 | type = TREE_TYPE (decl); | |
35b1a6fa | 5126 | |
349ae713 NB |
5127 | if (TREE_CODE (decl) == TYPE_DECL |
5128 | || TREE_CODE (decl) == PARM_DECL | |
5129 | || TREE_CODE (decl) == VAR_DECL | |
5130 | || TREE_CODE (decl) == FUNCTION_DECL | |
5131 | || TREE_CODE (decl) == FIELD_DECL) | |
5132 | TREE_DEPRECATED (decl) = 1; | |
5133 | else | |
5134 | warn = 1; | |
5135 | } | |
5136 | else if (TYPE_P (*node)) | |
5137 | { | |
5138 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
8dd16ecc | 5139 | *node = build_variant_type_copy (*node); |
349ae713 NB |
5140 | TREE_DEPRECATED (*node) = 1; |
5141 | type = *node; | |
5142 | } | |
5143 | else | |
5144 | warn = 1; | |
35b1a6fa | 5145 | |
349ae713 NB |
5146 | if (warn) |
5147 | { | |
5148 | *no_add_attrs = true; | |
5149 | if (type && TYPE_NAME (type)) | |
5150 | { | |
5151 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
c51a1ba9 | 5152 | what = TYPE_NAME (*node); |
349ae713 NB |
5153 | else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL |
5154 | && DECL_NAME (TYPE_NAME (type))) | |
c51a1ba9 | 5155 | what = DECL_NAME (TYPE_NAME (type)); |
349ae713 NB |
5156 | } |
5157 | if (what) | |
5c498b10 | 5158 | warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what); |
349ae713 | 5159 | else |
5c498b10 | 5160 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
5161 | } |
5162 | ||
5163 | return NULL_TREE; | |
5164 | } | |
5165 | ||
349ae713 NB |
5166 | /* Handle a "vector_size" attribute; arguments as in |
5167 | struct attribute_spec.handler. */ | |
5168 | ||
5169 | static tree | |
35b1a6fa | 5170 | handle_vector_size_attribute (tree *node, tree name, tree args, |
e18476eb | 5171 | int ARG_UNUSED (flags), |
a742c759 | 5172 | bool *no_add_attrs) |
349ae713 NB |
5173 | { |
5174 | unsigned HOST_WIDE_INT vecsize, nunits; | |
26277d41 | 5175 | enum machine_mode orig_mode; |
4a5eab38 | 5176 | tree type = *node, new_type, size; |
349ae713 NB |
5177 | |
5178 | *no_add_attrs = true; | |
5179 | ||
4a5eab38 | 5180 | size = TREE_VALUE (args); |
4a5eab38 | 5181 | |
3f75a254 | 5182 | if (!host_integerp (size, 1)) |
349ae713 | 5183 | { |
5c498b10 | 5184 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
349ae713 NB |
5185 | return NULL_TREE; |
5186 | } | |
5187 | ||
5188 | /* Get the vector size (in bytes). */ | |
4a5eab38 | 5189 | vecsize = tree_low_cst (size, 1); |
349ae713 NB |
5190 | |
5191 | /* We need to provide for vector pointers, vector arrays, and | |
5192 | functions returning vectors. For example: | |
5193 | ||
5194 | __attribute__((vector_size(16))) short *foo; | |
5195 | ||
5196 | In this case, the mode is SI, but the type being modified is | |
5197 | HI, so we need to look further. */ | |
5198 | ||
5199 | while (POINTER_TYPE_P (type) | |
5200 | || TREE_CODE (type) == FUNCTION_TYPE | |
43dc123f | 5201 | || TREE_CODE (type) == METHOD_TYPE |
349ae713 NB |
5202 | || TREE_CODE (type) == ARRAY_TYPE) |
5203 | type = TREE_TYPE (type); | |
5204 | ||
5205 | /* Get the mode of the type being modified. */ | |
5206 | orig_mode = TYPE_MODE (type); | |
5207 | ||
5208 | if (TREE_CODE (type) == RECORD_TYPE | |
3d8bf70f | 5209 | || (!SCALAR_FLOAT_MODE_P (orig_mode) |
349ae713 | 5210 | && GET_MODE_CLASS (orig_mode) != MODE_INT) |
3f75a254 | 5211 | || !host_integerp (TYPE_SIZE_UNIT (type), 1)) |
349ae713 | 5212 | { |
c51a1ba9 | 5213 | error ("invalid vector type for attribute %qE", name); |
349ae713 NB |
5214 | return NULL_TREE; |
5215 | } | |
5216 | ||
5217 | /* Calculate how many units fit in the vector. */ | |
5218 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
26277d41 | 5219 | if (nunits & (nunits - 1)) |
349ae713 | 5220 | { |
26277d41 | 5221 | error ("number of components of the vector not a power of two"); |
349ae713 NB |
5222 | return NULL_TREE; |
5223 | } | |
5224 | ||
26277d41 | 5225 | new_type = build_vector_type (type, nunits); |
349ae713 NB |
5226 | |
5227 | /* Build back pointers if needed. */ | |
b34417a4 | 5228 | *node = reconstruct_complex_type (*node, new_type); |
349ae713 NB |
5229 | |
5230 | return NULL_TREE; | |
5231 | } | |
5232 | ||
b34c7881 JT |
5233 | /* Handle the "nonnull" attribute. */ |
5234 | static tree | |
e18476eb BI |
5235 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), |
5236 | tree args, int ARG_UNUSED (flags), | |
a742c759 | 5237 | bool *no_add_attrs) |
b34c7881 JT |
5238 | { |
5239 | tree type = *node; | |
5240 | unsigned HOST_WIDE_INT attr_arg_num; | |
5241 | ||
5242 | /* If no arguments are specified, all pointer arguments should be | |
95bd1dd7 | 5243 | non-null. Verify a full prototype is given so that the arguments |
b34c7881 | 5244 | will have the correct types when we actually check them later. */ |
3f75a254 | 5245 | if (!args) |
b34c7881 | 5246 | { |
3f75a254 | 5247 | if (!TYPE_ARG_TYPES (type)) |
b34c7881 JT |
5248 | { |
5249 | error ("nonnull attribute without arguments on a non-prototype"); | |
6de9cd9a | 5250 | *no_add_attrs = true; |
b34c7881 JT |
5251 | } |
5252 | return NULL_TREE; | |
5253 | } | |
5254 | ||
5255 | /* Argument list specified. Verify that each argument number references | |
5256 | a pointer argument. */ | |
5257 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
5258 | { | |
5259 | tree argument; | |
6de9cd9a | 5260 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
b34c7881 | 5261 | |
3f75a254 | 5262 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) |
b34c7881 | 5263 | { |
40b97a2e | 5264 | error ("nonnull argument has invalid operand number (argument %lu)", |
b34c7881 JT |
5265 | (unsigned long) attr_arg_num); |
5266 | *no_add_attrs = true; | |
5267 | return NULL_TREE; | |
5268 | } | |
5269 | ||
5270 | argument = TYPE_ARG_TYPES (type); | |
5271 | if (argument) | |
5272 | { | |
5273 | for (ck_num = 1; ; ck_num++) | |
5274 | { | |
3f75a254 | 5275 | if (!argument || ck_num == arg_num) |
b34c7881 JT |
5276 | break; |
5277 | argument = TREE_CHAIN (argument); | |
5278 | } | |
5279 | ||
3f75a254 | 5280 | if (!argument |
b34c7881 JT |
5281 | || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
5282 | { | |
40b97a2e | 5283 | error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)", |
b34c7881 JT |
5284 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5285 | *no_add_attrs = true; | |
5286 | return NULL_TREE; | |
5287 | } | |
5288 | ||
6de9cd9a | 5289 | if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
b34c7881 | 5290 | { |
40b97a2e | 5291 | error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)", |
b34c7881 JT |
5292 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5293 | *no_add_attrs = true; | |
5294 | return NULL_TREE; | |
5295 | } | |
5296 | } | |
5297 | } | |
5298 | ||
5299 | return NULL_TREE; | |
5300 | } | |
5301 | ||
5302 | /* Check the argument list of a function call for null in argument slots | |
5303 | that are marked as requiring a non-null pointer argument. */ | |
5304 | ||
5305 | static void | |
35b1a6fa | 5306 | check_function_nonnull (tree attrs, tree params) |
b34c7881 JT |
5307 | { |
5308 | tree a, args, param; | |
5309 | int param_num; | |
5310 | ||
5311 | for (a = attrs; a; a = TREE_CHAIN (a)) | |
5312 | { | |
5313 | if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
5314 | { | |
6de9cd9a | 5315 | args = TREE_VALUE (a); |
b34c7881 | 5316 | |
6de9cd9a DN |
5317 | /* Walk the argument list. If we encounter an argument number we |
5318 | should check for non-null, do it. If the attribute has no args, | |
5319 | then every pointer argument is checked (in which case the check | |
b34c7881 | 5320 | for pointer type is done in check_nonnull_arg). */ |
6de9cd9a DN |
5321 | for (param = params, param_num = 1; ; |
5322 | param_num++, param = TREE_CHAIN (param)) | |
5323 | { | |
3f75a254 | 5324 | if (!param) |
35b1a6fa | 5325 | break; |
3f75a254 | 5326 | if (!args || nonnull_check_p (args, param_num)) |
35b1a6fa AJ |
5327 | check_function_arguments_recurse (check_nonnull_arg, NULL, |
5328 | TREE_VALUE (param), | |
5329 | param_num); | |
6de9cd9a | 5330 | } |
b34c7881 JT |
5331 | } |
5332 | } | |
5333 | } | |
5334 | ||
254986c7 KG |
5335 | /* Check that the Nth argument of a function call (counting backwards |
5336 | from the end) is a (pointer)0. */ | |
3d091dac KG |
5337 | |
5338 | static void | |
10a22b11 | 5339 | check_function_sentinel (tree attrs, tree params, tree typelist) |
3d091dac KG |
5340 | { |
5341 | tree attr = lookup_attribute ("sentinel", attrs); | |
5342 | ||
5343 | if (attr) | |
5344 | { | |
10a22b11 KG |
5345 | /* Skip over the named arguments. */ |
5346 | while (typelist && params) | |
5347 | { | |
5348 | typelist = TREE_CHAIN (typelist); | |
5349 | params = TREE_CHAIN (params); | |
5350 | } | |
5351 | ||
5352 | if (typelist || !params) | |
30480ec4 DD |
5353 | warning (OPT_Wformat, |
5354 | "not enough variable arguments to fit a sentinel"); | |
3d091dac KG |
5355 | else |
5356 | { | |
254986c7 KG |
5357 | tree sentinel, end; |
5358 | unsigned pos = 0; | |
5359 | ||
5360 | if (TREE_VALUE (attr)) | |
5361 | { | |
5362 | tree p = TREE_VALUE (TREE_VALUE (attr)); | |
254986c7 KG |
5363 | pos = TREE_INT_CST_LOW (p); |
5364 | } | |
5365 | ||
5366 | sentinel = end = params; | |
5367 | ||
5368 | /* Advance `end' ahead of `sentinel' by `pos' positions. */ | |
5369 | while (pos > 0 && TREE_CHAIN (end)) | |
5370 | { | |
5371 | pos--; | |
5372 | end = TREE_CHAIN (end); | |
5373 | } | |
5374 | if (pos > 0) | |
5375 | { | |
30480ec4 DD |
5376 | warning (OPT_Wformat, |
5377 | "not enough variable arguments to fit a sentinel"); | |
254986c7 KG |
5378 | return; |
5379 | } | |
5380 | ||
5381 | /* Now advance both until we find the last parameter. */ | |
5382 | while (TREE_CHAIN (end)) | |
5383 | { | |
5384 | end = TREE_CHAIN (end); | |
5385 | sentinel = TREE_CHAIN (sentinel); | |
5386 | } | |
5387 | ||
5388 | /* Validate the sentinel. */ | |
b2f97e4a MM |
5389 | if ((!POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (sentinel))) |
5390 | || !integer_zerop (TREE_VALUE (sentinel))) | |
5391 | /* Although __null (in C++) is only an integer we allow it | |
5392 | nevertheless, as we are guaranteed that it's exactly | |
5393 | as wide as a pointer, and we don't want to force | |
5394 | users to cast the NULL they have written there. | |
5395 | We warn with -Wstrict-null-sentinel, though. */ | |
5396 | && (warn_strict_null_sentinel | |
5397 | || null_node != TREE_VALUE (sentinel))) | |
30480ec4 | 5398 | warning (OPT_Wformat, "missing sentinel in function call"); |
3d091dac KG |
5399 | } |
5400 | } | |
5401 | } | |
5402 | ||
b34c7881 JT |
5403 | /* Helper for check_function_nonnull; given a list of operands which |
5404 | must be non-null in ARGS, determine if operand PARAM_NUM should be | |
5405 | checked. */ | |
5406 | ||
5407 | static bool | |
35b1a6fa | 5408 | nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) |
b34c7881 | 5409 | { |
6de9cd9a | 5410 | unsigned HOST_WIDE_INT arg_num = 0; |
b34c7881 JT |
5411 | |
5412 | for (; args; args = TREE_CHAIN (args)) | |
5413 | { | |
366de0ce NS |
5414 | bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); |
5415 | ||
5416 | gcc_assert (found); | |
b34c7881 JT |
5417 | |
5418 | if (arg_num == param_num) | |
5419 | return true; | |
5420 | } | |
5421 | return false; | |
5422 | } | |
5423 | ||
5424 | /* Check that the function argument PARAM (which is operand number | |
5425 | PARAM_NUM) is non-null. This is called by check_function_nonnull | |
5426 | via check_function_arguments_recurse. */ | |
5427 | ||
5428 | static void | |
e18476eb | 5429 | check_nonnull_arg (void * ARG_UNUSED (ctx), tree param, |
35b1a6fa | 5430 | unsigned HOST_WIDE_INT param_num) |
b34c7881 JT |
5431 | { |
5432 | /* Just skip checking the argument if it's not a pointer. This can | |
5433 | happen if the "nonnull" attribute was given without an operand | |
5434 | list (which means to check every pointer argument). */ | |
5435 | ||
5436 | if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
5437 | return; | |
5438 | ||
5439 | if (integer_zerop (param)) | |
30480ec4 DD |
5440 | warning (OPT_Wnonnull, "null argument where non-null required " |
5441 | "(argument %lu)", (unsigned long) param_num); | |
b34c7881 JT |
5442 | } |
5443 | ||
5444 | /* Helper for nonnull attribute handling; fetch the operand number | |
5445 | from the attribute argument list. */ | |
5446 | ||
5447 | static bool | |
35b1a6fa | 5448 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
b34c7881 | 5449 | { |
f6d1c3a6 | 5450 | /* Verify the arg number is a constant. */ |
b34c7881 JT |
5451 | if (TREE_CODE (arg_num_expr) != INTEGER_CST |
5452 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
5453 | return false; | |
5454 | ||
5455 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5456 | return true; | |
5457 | } | |
39f2f3c8 RS |
5458 | |
5459 | /* Handle a "nothrow" attribute; arguments as in | |
5460 | struct attribute_spec.handler. */ | |
5461 | ||
5462 | static tree | |
e18476eb BI |
5463 | handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5464 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
39f2f3c8 RS |
5465 | { |
5466 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5467 | TREE_NOTHROW (*node) = 1; | |
5468 | /* ??? TODO: Support types. */ | |
5469 | else | |
5470 | { | |
5c498b10 | 5471 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
39f2f3c8 RS |
5472 | *no_add_attrs = true; |
5473 | } | |
5474 | ||
5475 | return NULL_TREE; | |
5476 | } | |
0bfa5f65 RH |
5477 | |
5478 | /* Handle a "cleanup" attribute; arguments as in | |
5479 | struct attribute_spec.handler. */ | |
5480 | ||
5481 | static tree | |
35b1a6fa | 5482 | handle_cleanup_attribute (tree *node, tree name, tree args, |
e18476eb | 5483 | int ARG_UNUSED (flags), bool *no_add_attrs) |
0bfa5f65 RH |
5484 | { |
5485 | tree decl = *node; | |
5486 | tree cleanup_id, cleanup_decl; | |
5487 | ||
5488 | /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
5489 | for global destructors in C++. This requires infrastructure that | |
5490 | we don't have generically at the moment. It's also not a feature | |
5491 | we'd be missing too much, since we do have attribute constructor. */ | |
5492 | if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
5493 | { | |
5c498b10 | 5494 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
0bfa5f65 RH |
5495 | *no_add_attrs = true; |
5496 | return NULL_TREE; | |
5497 | } | |
5498 | ||
5499 | /* Verify that the argument is a function in scope. */ | |
5500 | /* ??? We could support pointers to functions here as well, if | |
5501 | that was considered desirable. */ | |
5502 | cleanup_id = TREE_VALUE (args); | |
5503 | if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
5504 | { | |
40b97a2e | 5505 | error ("cleanup argument not an identifier"); |
0bfa5f65 RH |
5506 | *no_add_attrs = true; |
5507 | return NULL_TREE; | |
5508 | } | |
10e6657a | 5509 | cleanup_decl = lookup_name (cleanup_id); |
0bfa5f65 RH |
5510 | if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) |
5511 | { | |
40b97a2e | 5512 | error ("cleanup argument not a function"); |
0bfa5f65 RH |
5513 | *no_add_attrs = true; |
5514 | return NULL_TREE; | |
5515 | } | |
5516 | ||
35b1a6fa | 5517 | /* That the function has proper type is checked with the |
0bfa5f65 RH |
5518 | eventual call to build_function_call. */ |
5519 | ||
5520 | return NULL_TREE; | |
5521 | } | |
72954a4f JM |
5522 | |
5523 | /* Handle a "warn_unused_result" attribute. No special handling. */ | |
5524 | ||
5525 | static tree | |
5526 | handle_warn_unused_result_attribute (tree *node, tree name, | |
e18476eb BI |
5527 | tree ARG_UNUSED (args), |
5528 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
72954a4f JM |
5529 | { |
5530 | /* Ignore the attribute for functions not returning any value. */ | |
5531 | if (VOID_TYPE_P (TREE_TYPE (*node))) | |
5532 | { | |
5c498b10 | 5533 | warning (OPT_Wattributes, "%qE attribute ignored", name); |
72954a4f JM |
5534 | *no_add_attrs = true; |
5535 | } | |
5536 | ||
5537 | return NULL_TREE; | |
5538 | } | |
3d091dac KG |
5539 | |
5540 | /* Handle a "sentinel" attribute. */ | |
5541 | ||
5542 | static tree | |
254986c7 | 5543 | handle_sentinel_attribute (tree *node, tree name, tree args, |
3d091dac KG |
5544 | int ARG_UNUSED (flags), bool *no_add_attrs) |
5545 | { | |
5546 | tree params = TYPE_ARG_TYPES (*node); | |
5547 | ||
5548 | if (!params) | |
5549 | { | |
5c498b10 DD |
5550 | warning (OPT_Wattributes, |
5551 | "%qE attribute requires prototypes with named arguments", name); | |
3d091dac | 5552 | *no_add_attrs = true; |
3d091dac | 5553 | } |
254986c7 KG |
5554 | else |
5555 | { | |
5556 | while (TREE_CHAIN (params)) | |
5557 | params = TREE_CHAIN (params); | |
3d091dac | 5558 | |
254986c7 KG |
5559 | if (VOID_TYPE_P (TREE_VALUE (params))) |
5560 | { | |
5c498b10 DD |
5561 | warning (OPT_Wattributes, |
5562 | "%qE attribute only applies to variadic functions", name); | |
254986c7 KG |
5563 | *no_add_attrs = true; |
5564 | } | |
5565 | } | |
5566 | ||
5567 | if (args) | |
3d091dac | 5568 | { |
254986c7 KG |
5569 | tree position = TREE_VALUE (args); |
5570 | ||
254986c7 KG |
5571 | if (TREE_CODE (position) != INTEGER_CST) |
5572 | { | |
d4ee4d25 | 5573 | warning (0, "requested position is not an integer constant"); |
254986c7 KG |
5574 | *no_add_attrs = true; |
5575 | } | |
5576 | else | |
5577 | { | |
5578 | if (tree_int_cst_lt (position, integer_zero_node)) | |
5579 | { | |
d4ee4d25 | 5580 | warning (0, "requested position is less than zero"); |
254986c7 KG |
5581 | *no_add_attrs = true; |
5582 | } | |
5583 | } | |
3d091dac KG |
5584 | } |
5585 | ||
5586 | return NULL_TREE; | |
5587 | } | |
b34c7881 JT |
5588 | \f |
5589 | /* Check for valid arguments being passed to a function. */ | |
5590 | void | |
10a22b11 | 5591 | check_function_arguments (tree attrs, tree params, tree typelist) |
b34c7881 JT |
5592 | { |
5593 | /* Check for null being passed in a pointer argument that must be | |
5594 | non-null. We also need to do this if format checking is enabled. */ | |
5595 | ||
5596 | if (warn_nonnull) | |
5597 | check_function_nonnull (attrs, params); | |
5598 | ||
5599 | /* Check for errors in format strings. */ | |
5600 | ||
7876a414 | 5601 | if (warn_format || warn_missing_format_attribute) |
3d091dac | 5602 | check_function_format (attrs, params); |
7876a414 KG |
5603 | |
5604 | if (warn_format) | |
5605 | check_function_sentinel (attrs, params, typelist); | |
b34c7881 JT |
5606 | } |
5607 | ||
5608 | /* Generic argument checking recursion routine. PARAM is the argument to | |
5609 | be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
5610 | once the argument is resolved. CTX is context for the callback. */ | |
5611 | void | |
35b1a6fa AJ |
5612 | check_function_arguments_recurse (void (*callback) |
5613 | (void *, tree, unsigned HOST_WIDE_INT), | |
5614 | void *ctx, tree param, | |
5615 | unsigned HOST_WIDE_INT param_num) | |
b34c7881 JT |
5616 | { |
5617 | if (TREE_CODE (param) == NOP_EXPR) | |
5618 | { | |
5619 | /* Strip coercion. */ | |
5620 | check_function_arguments_recurse (callback, ctx, | |
6de9cd9a | 5621 | TREE_OPERAND (param, 0), param_num); |
b34c7881 JT |
5622 | return; |
5623 | } | |
5624 | ||
5625 | if (TREE_CODE (param) == CALL_EXPR) | |
5626 | { | |
5627 | tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0))); | |
5628 | tree attrs; | |
5629 | bool found_format_arg = false; | |
5630 | ||
5631 | /* See if this is a call to a known internationalization function | |
5632 | that modifies a format arg. Such a function may have multiple | |
5633 | format_arg attributes (for example, ngettext). */ | |
5634 | ||
5635 | for (attrs = TYPE_ATTRIBUTES (type); | |
5636 | attrs; | |
5637 | attrs = TREE_CHAIN (attrs)) | |
5638 | if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
5639 | { | |
5640 | tree inner_args; | |
5641 | tree format_num_expr; | |
5642 | int format_num; | |
5643 | int i; | |
5644 | ||
5645 | /* Extract the argument number, which was previously checked | |
5646 | to be valid. */ | |
5647 | format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
b34c7881 | 5648 | |
366de0ce NS |
5649 | gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST |
5650 | && !TREE_INT_CST_HIGH (format_num_expr)); | |
b34c7881 JT |
5651 | |
5652 | format_num = TREE_INT_CST_LOW (format_num_expr); | |
5653 | ||
5654 | for (inner_args = TREE_OPERAND (param, 1), i = 1; | |
5655 | inner_args != 0; | |
5656 | inner_args = TREE_CHAIN (inner_args), i++) | |
5657 | if (i == format_num) | |
5658 | { | |
5659 | check_function_arguments_recurse (callback, ctx, | |
5660 | TREE_VALUE (inner_args), | |
5661 | param_num); | |
5662 | found_format_arg = true; | |
5663 | break; | |
5664 | } | |
5665 | } | |
5666 | ||
5667 | /* If we found a format_arg attribute and did a recursive check, | |
5668 | we are done with checking this argument. Otherwise, we continue | |
5669 | and this will be considered a non-literal. */ | |
5670 | if (found_format_arg) | |
5671 | return; | |
5672 | } | |
5673 | ||
5674 | if (TREE_CODE (param) == COND_EXPR) | |
5675 | { | |
5676 | /* Check both halves of the conditional expression. */ | |
5677 | check_function_arguments_recurse (callback, ctx, | |
6de9cd9a | 5678 | TREE_OPERAND (param, 1), param_num); |
b34c7881 | 5679 | check_function_arguments_recurse (callback, ctx, |
6de9cd9a | 5680 | TREE_OPERAND (param, 2), param_num); |
b34c7881 JT |
5681 | return; |
5682 | } | |
5683 | ||
5684 | (*callback) (ctx, param, param_num); | |
5685 | } | |
e2500fed | 5686 | |
d07605f5 AP |
5687 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
5688 | ||
5689 | int | |
5690 | field_decl_cmp (const void *x_p, const void *y_p) | |
5691 | { | |
28dab132 BI |
5692 | const tree *const x = (const tree *const) x_p; |
5693 | const tree *const y = (const tree *const) y_p; | |
5694 | ||
d07605f5 AP |
5695 | if (DECL_NAME (*x) == DECL_NAME (*y)) |
5696 | /* A nontype is "greater" than a type. */ | |
5697 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5698 | if (DECL_NAME (*x) == NULL_TREE) | |
5699 | return -1; | |
5700 | if (DECL_NAME (*y) == NULL_TREE) | |
5701 | return 1; | |
5702 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
5703 | return -1; | |
5704 | return 1; | |
5705 | } | |
5706 | ||
5707 | static struct { | |
5708 | gt_pointer_operator new_value; | |
5709 | void *cookie; | |
5710 | } resort_data; | |
5711 | ||
5712 | /* This routine compares two fields like field_decl_cmp but using the | |
5713 | pointer operator in resort_data. */ | |
5714 | ||
5715 | static int | |
5716 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
5717 | { | |
28dab132 BI |
5718 | const tree *const x = (const tree *const) x_p; |
5719 | const tree *const y = (const tree *const) y_p; | |
d07605f5 AP |
5720 | |
5721 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
5722 | /* A nontype is "greater" than a type. */ | |
5723 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5724 | if (DECL_NAME (*x) == NULL_TREE) | |
5725 | return -1; | |
5726 | if (DECL_NAME (*y) == NULL_TREE) | |
5727 | return 1; | |
5728 | { | |
5729 | tree d1 = DECL_NAME (*x); | |
5730 | tree d2 = DECL_NAME (*y); | |
5731 | resort_data.new_value (&d1, resort_data.cookie); | |
5732 | resort_data.new_value (&d2, resort_data.cookie); | |
5733 | if (d1 < d2) | |
5734 | return -1; | |
5735 | } | |
5736 | return 1; | |
5737 | } | |
5738 | ||
5739 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
5740 | ||
5741 | void | |
5742 | resort_sorted_fields (void *obj, | |
e18476eb | 5743 | void * ARG_UNUSED (orig_obj), |
6de9cd9a DN |
5744 | gt_pointer_operator new_value, |
5745 | void *cookie) | |
d07605f5 | 5746 | { |
e18476eb | 5747 | struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; |
d07605f5 AP |
5748 | resort_data.new_value = new_value; |
5749 | resort_data.cookie = cookie; | |
5750 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
6de9cd9a | 5751 | resort_field_decl_cmp); |
d07605f5 AP |
5752 | } |
5753 | ||
0a3ee0fd GDR |
5754 | /* Subroutine of c_parse_error. |
5755 | Return the result of concatenating LHS and RHS. RHS is really | |
5756 | a string literal, its first character is indicated by RHS_START and | |
3292fb42 | 5757 | RHS_SIZE is its length (including the terminating NUL character). |
0a3ee0fd GDR |
5758 | |
5759 | The caller is responsible for deleting the returned pointer. */ | |
5760 | ||
5761 | static char * | |
5762 | catenate_strings (const char *lhs, const char *rhs_start, int rhs_size) | |
5763 | { | |
5764 | const int lhs_size = strlen (lhs); | |
5765 | char *result = XNEWVEC (char, lhs_size + rhs_size); | |
5766 | strncpy (result, lhs, lhs_size); | |
5767 | strncpy (result + lhs_size, rhs_start, rhs_size); | |
5768 | return result; | |
5769 | } | |
5770 | ||
4b794eaf | 5771 | /* Issue the error given by GMSGID, indicating that it occurred before |
4bb8ca28 MM |
5772 | TOKEN, which had the associated VALUE. */ |
5773 | ||
5774 | void | |
4b794eaf | 5775 | c_parse_error (const char *gmsgid, enum cpp_ttype token, tree value) |
4bb8ca28 | 5776 | { |
0a3ee0fd GDR |
5777 | #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2)) |
5778 | ||
5779 | char *message = NULL; | |
4bb8ca28 MM |
5780 | |
5781 | if (token == CPP_EOF) | |
4b794eaf | 5782 | message = catenate_messages (gmsgid, " at end of input"); |
4bb8ca28 MM |
5783 | else if (token == CPP_CHAR || token == CPP_WCHAR) |
5784 | { | |
5785 | unsigned int val = TREE_INT_CST_LOW (value); | |
5786 | const char *const ell = (token == CPP_CHAR) ? "" : "L"; | |
5787 | if (val <= UCHAR_MAX && ISGRAPH (val)) | |
4b794eaf | 5788 | message = catenate_messages (gmsgid, " before %s'%c'"); |
4bb8ca28 | 5789 | else |
4b794eaf | 5790 | message = catenate_messages (gmsgid, " before %s'\\x%x'"); |
0a3ee0fd GDR |
5791 | |
5792 | error (message, ell, val); | |
5793 | free (message); | |
5794 | message = NULL; | |
4bb8ca28 | 5795 | } |
0a3ee0fd | 5796 | else if (token == CPP_STRING || token == CPP_WSTRING) |
4b794eaf | 5797 | message = catenate_messages (gmsgid, " before string constant"); |
4bb8ca28 | 5798 | else if (token == CPP_NUMBER) |
4b794eaf | 5799 | message = catenate_messages (gmsgid, " before numeric constant"); |
4bb8ca28 | 5800 | else if (token == CPP_NAME) |
0a3ee0fd | 5801 | { |
4b794eaf | 5802 | message = catenate_messages (gmsgid, " before %qE"); |
c51a1ba9 | 5803 | error (message, value); |
0a3ee0fd GDR |
5804 | free (message); |
5805 | message = NULL; | |
5806 | } | |
4bb8ca28 | 5807 | else if (token < N_TTYPES) |
0a3ee0fd | 5808 | { |
4b794eaf | 5809 | message = catenate_messages (gmsgid, " before %qs token"); |
0a3ee0fd GDR |
5810 | error (message, cpp_type2name (token)); |
5811 | free (message); | |
5812 | message = NULL; | |
5813 | } | |
4bb8ca28 | 5814 | else |
4b794eaf | 5815 | error (gmsgid); |
0a3ee0fd GDR |
5816 | |
5817 | if (message) | |
5818 | { | |
5819 | error (message); | |
5820 | free (message); | |
5821 | } | |
5822 | #undef catenate_messages | |
4bb8ca28 MM |
5823 | } |
5824 | ||
6de9cd9a DN |
5825 | /* Walk a gimplified function and warn for functions whose return value is |
5826 | ignored and attribute((warn_unused_result)) is set. This is done before | |
9f63daea EC |
5827 | inlining, so we don't have to worry about that. */ |
5828 | ||
6de9cd9a DN |
5829 | void |
5830 | c_warn_unused_result (tree *top_p) | |
5831 | { | |
5832 | tree t = *top_p; | |
5833 | tree_stmt_iterator i; | |
5834 | tree fdecl, ftype; | |
5835 | ||
5836 | switch (TREE_CODE (t)) | |
5837 | { | |
5838 | case STATEMENT_LIST: | |
5839 | for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i)) | |
5840 | c_warn_unused_result (tsi_stmt_ptr (i)); | |
5841 | break; | |
5842 | ||
5843 | case COND_EXPR: | |
5844 | c_warn_unused_result (&COND_EXPR_THEN (t)); | |
5845 | c_warn_unused_result (&COND_EXPR_ELSE (t)); | |
5846 | break; | |
5847 | case BIND_EXPR: | |
5848 | c_warn_unused_result (&BIND_EXPR_BODY (t)); | |
5849 | break; | |
5850 | case TRY_FINALLY_EXPR: | |
5851 | case TRY_CATCH_EXPR: | |
5852 | c_warn_unused_result (&TREE_OPERAND (t, 0)); | |
5853 | c_warn_unused_result (&TREE_OPERAND (t, 1)); | |
5854 | break; | |
5855 | case CATCH_EXPR: | |
5856 | c_warn_unused_result (&CATCH_BODY (t)); | |
5857 | break; | |
5858 | case EH_FILTER_EXPR: | |
5859 | c_warn_unused_result (&EH_FILTER_FAILURE (t)); | |
5860 | break; | |
5861 | ||
5862 | case CALL_EXPR: | |
5201931e JM |
5863 | if (TREE_USED (t)) |
5864 | break; | |
5865 | ||
6de9cd9a DN |
5866 | /* This is a naked call, as opposed to a CALL_EXPR nested inside |
5867 | a MODIFY_EXPR. All calls whose value is ignored should be | |
5868 | represented like this. Look for the attribute. */ | |
5869 | fdecl = get_callee_fndecl (t); | |
5870 | if (fdecl) | |
5871 | ftype = TREE_TYPE (fdecl); | |
5872 | else | |
5873 | { | |
5874 | ftype = TREE_TYPE (TREE_OPERAND (t, 0)); | |
5875 | /* Look past pointer-to-function to the function type itself. */ | |
5876 | ftype = TREE_TYPE (ftype); | |
5877 | } | |
5878 | ||
5879 | if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype))) | |
5880 | { | |
5881 | if (fdecl) | |
d4ee4d25 | 5882 | warning (0, "%Hignoring return value of %qD, " |
6de9cd9a DN |
5883 | "declared with attribute warn_unused_result", |
5884 | EXPR_LOCUS (t), fdecl); | |
5885 | else | |
d4ee4d25 | 5886 | warning (0, "%Hignoring return value of function " |
6de9cd9a DN |
5887 | "declared with attribute warn_unused_result", |
5888 | EXPR_LOCUS (t)); | |
5889 | } | |
5890 | break; | |
5891 | ||
5892 | default: | |
5893 | /* Not a container, not a call, or a call whose value is used. */ | |
5894 | break; | |
5895 | } | |
5896 | } | |
5897 | ||
c5ff069d ZW |
5898 | /* Convert a character from the host to the target execution character |
5899 | set. cpplib handles this, mostly. */ | |
5900 | ||
5901 | HOST_WIDE_INT | |
5902 | c_common_to_target_charset (HOST_WIDE_INT c) | |
5903 | { | |
5904 | /* Character constants in GCC proper are sign-extended under -fsigned-char, | |
5905 | zero-extended under -fno-signed-char. cpplib insists that characters | |
5906 | and character constants are always unsigned. Hence we must convert | |
5907 | back and forth. */ | |
5908 | cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1); | |
5909 | ||
5910 | uc = cpp_host_to_exec_charset (parse_in, uc); | |
5911 | ||
5912 | if (flag_signed_char) | |
5913 | return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE) | |
5914 | >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE); | |
5915 | else | |
5916 | return uc; | |
5917 | } | |
5918 | ||
ee8a6a3e RH |
5919 | /* Build the result of __builtin_offsetof. EXPR is a nested sequence of |
5920 | component references, with an INDIRECT_REF at the bottom; much like | |
5921 | the traditional rendering of offsetof as a macro. Returns the folded | |
5922 | and properly cast result. */ | |
5923 | ||
5924 | static tree | |
5925 | fold_offsetof_1 (tree expr) | |
5926 | { | |
5927 | enum tree_code code = PLUS_EXPR; | |
5928 | tree base, off, t; | |
5929 | ||
5930 | switch (TREE_CODE (expr)) | |
5931 | { | |
5932 | case ERROR_MARK: | |
5933 | return expr; | |
5934 | ||
5935 | case INDIRECT_REF: | |
5936 | return size_zero_node; | |
5937 | ||
5938 | case COMPONENT_REF: | |
5939 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0)); | |
5940 | if (base == error_mark_node) | |
5941 | return base; | |
5942 | ||
5943 | t = TREE_OPERAND (expr, 1); | |
5944 | if (DECL_C_BIT_FIELD (t)) | |
5945 | { | |
5946 | error ("attempt to take address of bit-field structure " | |
c51a1ba9 | 5947 | "member %qD", t); |
ee8a6a3e RH |
5948 | return error_mark_node; |
5949 | } | |
5950 | off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t), | |
5951 | size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1) | |
5952 | / BITS_PER_UNIT)); | |
5953 | break; | |
5954 | ||
5955 | case ARRAY_REF: | |
5956 | base = fold_offsetof_1 (TREE_OPERAND (expr, 0)); | |
5957 | if (base == error_mark_node) | |
5958 | return base; | |
5959 | ||
5960 | t = TREE_OPERAND (expr, 1); | |
5961 | if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0) | |
5962 | { | |
5963 | code = MINUS_EXPR; | |
987b67bc | 5964 | t = fold_build1 (NEGATE_EXPR, TREE_TYPE (t), t); |
ee8a6a3e RH |
5965 | } |
5966 | t = convert (sizetype, t); | |
5967 | off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t); | |
5968 | break; | |
5969 | ||
5970 | default: | |
366de0ce | 5971 | gcc_unreachable (); |
ee8a6a3e RH |
5972 | } |
5973 | ||
5974 | return size_binop (code, base, off); | |
5975 | } | |
5976 | ||
5977 | tree | |
5978 | fold_offsetof (tree expr) | |
5979 | { | |
5980 | /* Convert back from the internal sizetype to size_t. */ | |
5981 | return convert (size_type_node, fold_offsetof_1 (expr)); | |
5982 | } | |
5983 | ||
37dc0d8d | 5984 | /* Print an error message for an invalid lvalue. USE says |
5ae9ba3e MM |
5985 | how the lvalue is being used and so selects the error message. */ |
5986 | ||
37dc0d8d JM |
5987 | void |
5988 | lvalue_error (enum lvalue_use use) | |
5ae9ba3e | 5989 | { |
37dc0d8d | 5990 | switch (use) |
5ae9ba3e | 5991 | { |
37dc0d8d | 5992 | case lv_assign: |
5d352b2d | 5993 | error ("lvalue required as left operand of assignment"); |
37dc0d8d JM |
5994 | break; |
5995 | case lv_increment: | |
5d352b2d | 5996 | error ("lvalue required as increment operand"); |
37dc0d8d JM |
5997 | break; |
5998 | case lv_decrement: | |
5d352b2d | 5999 | error ("lvalue required as decrement operand"); |
37dc0d8d JM |
6000 | break; |
6001 | case lv_addressof: | |
5d352b2d | 6002 | error ("lvalue required as unary %<&%> operand"); |
37dc0d8d JM |
6003 | break; |
6004 | case lv_asm: | |
5d352b2d | 6005 | error ("lvalue required in asm statement"); |
37dc0d8d JM |
6006 | break; |
6007 | default: | |
6008 | gcc_unreachable (); | |
5ae9ba3e | 6009 | } |
5ae9ba3e | 6010 | } |
aab038d5 RH |
6011 | \f |
6012 | /* *PTYPE is an incomplete array. Complete it with a domain based on | |
6013 | INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT | |
6014 | is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, | |
6015 | 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */ | |
6016 | ||
6017 | int | |
6018 | complete_array_type (tree *ptype, tree initial_value, bool do_default) | |
6019 | { | |
6020 | tree maxindex, type, main_type, elt, unqual_elt; | |
6021 | int failure = 0, quals; | |
6022 | ||
6023 | maxindex = size_zero_node; | |
6024 | if (initial_value) | |
6025 | { | |
6026 | if (TREE_CODE (initial_value) == STRING_CST) | |
6027 | { | |
6028 | int eltsize | |
6029 | = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
6030 | maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1); | |
6031 | } | |
6032 | else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
6033 | { | |
4038c495 | 6034 | VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value); |
aab038d5 | 6035 | |
4038c495 | 6036 | if (VEC_empty (constructor_elt, v)) |
aab038d5 RH |
6037 | { |
6038 | if (pedantic) | |
6039 | failure = 3; | |
6040 | maxindex = integer_minus_one_node; | |
6041 | } | |
6042 | else | |
6043 | { | |
6044 | tree curindex; | |
4038c495 GB |
6045 | unsigned HOST_WIDE_INT cnt; |
6046 | constructor_elt *ce; | |
aab038d5 | 6047 | |
4038c495 GB |
6048 | if (VEC_index (constructor_elt, v, 0)->index) |
6049 | maxindex = fold_convert (sizetype, | |
6050 | VEC_index (constructor_elt, | |
6051 | v, 0)->index); | |
aab038d5 RH |
6052 | curindex = maxindex; |
6053 | ||
4038c495 GB |
6054 | for (cnt = 1; |
6055 | VEC_iterate (constructor_elt, v, cnt, ce); | |
6056 | cnt++) | |
aab038d5 | 6057 | { |
4038c495 GB |
6058 | if (ce->index) |
6059 | curindex = fold_convert (sizetype, ce->index); | |
aab038d5 RH |
6060 | else |
6061 | curindex = size_binop (PLUS_EXPR, curindex, size_one_node); | |
6062 | ||
6063 | if (tree_int_cst_lt (maxindex, curindex)) | |
6064 | maxindex = curindex; | |
6065 | } | |
6066 | } | |
6067 | } | |
6068 | else | |
6069 | { | |
6070 | /* Make an error message unless that happened already. */ | |
6071 | if (initial_value != error_mark_node) | |
6072 | failure = 1; | |
6073 | } | |
6074 | } | |
6075 | else | |
6076 | { | |
6077 | failure = 2; | |
6078 | if (!do_default) | |
6079 | return failure; | |
6080 | } | |
6081 | ||
6082 | type = *ptype; | |
6083 | elt = TREE_TYPE (type); | |
6084 | quals = TYPE_QUALS (strip_array_types (elt)); | |
6085 | if (quals == 0) | |
6086 | unqual_elt = elt; | |
6087 | else | |
6088 | unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED); | |
6089 | ||
6090 | /* Using build_distinct_type_copy and modifying things afterward instead | |
6091 | of using build_array_type to create a new type preserves all of the | |
6092 | TYPE_LANG_FLAG_? bits that the front end may have set. */ | |
6093 | main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
6094 | TREE_TYPE (main_type) = unqual_elt; | |
6095 | TYPE_DOMAIN (main_type) = build_index_type (maxindex); | |
6096 | layout_type (main_type); | |
6097 | ||
6098 | if (quals == 0) | |
6099 | type = main_type; | |
6100 | else | |
6101 | type = c_build_qualified_type (main_type, quals); | |
6102 | ||
6103 | *ptype = type; | |
6104 | return failure; | |
6105 | } | |
5ae9ba3e | 6106 | |
48ae6c13 RH |
6107 | \f |
6108 | /* Used to help initialize the builtin-types.def table. When a type of | |
6109 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
6110 | The later results in segfaults even when a decl using the type doesn't | |
6111 | get invoked. */ | |
6112 | ||
6113 | tree | |
6114 | builtin_type_for_size (int size, bool unsignedp) | |
6115 | { | |
6116 | tree type = lang_hooks.types.type_for_size (size, unsignedp); | |
6117 | return type ? type : error_mark_node; | |
6118 | } | |
6119 | ||
6120 | /* A helper function for resolve_overloaded_builtin in resolving the | |
6121 | overloaded __sync_ builtins. Returns a positive power of 2 if the | |
6122 | first operand of PARAMS is a pointer to a supported data type. | |
6123 | Returns 0 if an error is encountered. */ | |
6124 | ||
6125 | static int | |
6126 | sync_resolve_size (tree function, tree params) | |
6127 | { | |
6128 | tree type; | |
6129 | int size; | |
6130 | ||
6131 | if (params == NULL) | |
6132 | { | |
6133 | error ("too few arguments to function %qE", function); | |
6134 | return 0; | |
6135 | } | |
6136 | ||
6137 | type = TREE_TYPE (TREE_VALUE (params)); | |
6138 | if (TREE_CODE (type) != POINTER_TYPE) | |
6139 | goto incompatible; | |
6140 | ||
6141 | type = TREE_TYPE (type); | |
6142 | if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type)) | |
6143 | goto incompatible; | |
6144 | ||
6145 | size = tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
6146 | if (size == 1 || size == 2 || size == 4 || size == 8) | |
6147 | return size; | |
6148 | ||
6149 | incompatible: | |
6150 | error ("incompatible type for argument %d of %qE", 1, function); | |
6151 | return 0; | |
6152 | } | |
6153 | ||
6154 | /* A helper function for resolve_overloaded_builtin. Adds casts to | |
6155 | PARAMS to make arguments match up with those of FUNCTION. Drops | |
6156 | the variadic arguments at the end. Returns false if some error | |
6157 | was encountered; true on success. */ | |
6158 | ||
6159 | static bool | |
6160 | sync_resolve_params (tree orig_function, tree function, tree params) | |
6161 | { | |
6162 | tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function)); | |
6163 | tree ptype; | |
6164 | int number; | |
6165 | ||
6166 | /* We've declared the implementation functions to use "volatile void *" | |
6167 | as the pointer parameter, so we shouldn't get any complaints from the | |
6168 | call to check_function_arguments what ever type the user used. */ | |
6169 | arg_types = TREE_CHAIN (arg_types); | |
6170 | ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
6171 | number = 2; | |
6172 | ||
6173 | /* For the rest of the values, we need to cast these to FTYPE, so that we | |
6174 | don't get warnings for passing pointer types, etc. */ | |
6175 | while (arg_types != void_list_node) | |
6176 | { | |
6177 | tree val; | |
6178 | ||
6179 | params = TREE_CHAIN (params); | |
6180 | if (params == NULL) | |
6181 | { | |
6182 | error ("too few arguments to function %qE", orig_function); | |
6183 | return false; | |
6184 | } | |
6185 | ||
6186 | /* ??? Ideally for the first conversion we'd use convert_for_assignment | |
6187 | so that we get warnings for anything that doesn't match the pointer | |
6188 | type. This isn't portable across the C and C++ front ends atm. */ | |
6189 | val = TREE_VALUE (params); | |
6190 | val = convert (ptype, val); | |
6191 | val = convert (TREE_VALUE (arg_types), val); | |
6192 | TREE_VALUE (params) = val; | |
6193 | ||
6194 | arg_types = TREE_CHAIN (arg_types); | |
6195 | number++; | |
6196 | } | |
6197 | ||
6198 | /* The definition of these primitives is variadic, with the remaining | |
6199 | being "an optional list of variables protected by the memory barrier". | |
6200 | No clue what that's supposed to mean, precisely, but we consider all | |
6201 | call-clobbered variables to be protected so we're safe. */ | |
6202 | TREE_CHAIN (params) = NULL; | |
6203 | ||
6204 | return true; | |
6205 | } | |
6206 | ||
6207 | /* A helper function for resolve_overloaded_builtin. Adds a cast to | |
6208 | RESULT to make it match the type of the first pointer argument in | |
6209 | PARAMS. */ | |
6210 | ||
6211 | static tree | |
6212 | sync_resolve_return (tree params, tree result) | |
6213 | { | |
6214 | tree ptype = TREE_TYPE (TREE_TYPE (TREE_VALUE (params))); | |
99db1ef0 | 6215 | ptype = TYPE_MAIN_VARIANT (ptype); |
48ae6c13 RH |
6216 | return convert (ptype, result); |
6217 | } | |
6218 | ||
6219 | /* Some builtin functions are placeholders for other expressions. This | |
6220 | function should be called immediately after parsing the call expression | |
6221 | before surrounding code has committed to the type of the expression. | |
6222 | ||
6223 | FUNCTION is the DECL that has been invoked; it is known to be a builtin. | |
6224 | PARAMS is the argument list for the call. The return value is non-null | |
6225 | when expansion is complete, and null if normal processing should | |
6226 | continue. */ | |
6227 | ||
6228 | tree | |
6229 | resolve_overloaded_builtin (tree function, tree params) | |
6230 | { | |
6231 | enum built_in_function orig_code = DECL_FUNCTION_CODE (function); | |
58646b77 PB |
6232 | switch (DECL_BUILT_IN_CLASS (function)) |
6233 | { | |
6234 | case BUILT_IN_NORMAL: | |
6235 | break; | |
6236 | case BUILT_IN_MD: | |
6237 | if (targetm.resolve_overloaded_builtin) | |
6238 | return targetm.resolve_overloaded_builtin (function, params); | |
6239 | else | |
6240 | return NULL_TREE; | |
6241 | default: | |
6242 | return NULL_TREE; | |
6243 | } | |
6244 | ||
6245 | /* Handle BUILT_IN_NORMAL here. */ | |
48ae6c13 RH |
6246 | switch (orig_code) |
6247 | { | |
6248 | case BUILT_IN_FETCH_AND_ADD_N: | |
6249 | case BUILT_IN_FETCH_AND_SUB_N: | |
6250 | case BUILT_IN_FETCH_AND_OR_N: | |
6251 | case BUILT_IN_FETCH_AND_AND_N: | |
6252 | case BUILT_IN_FETCH_AND_XOR_N: | |
6253 | case BUILT_IN_FETCH_AND_NAND_N: | |
6254 | case BUILT_IN_ADD_AND_FETCH_N: | |
6255 | case BUILT_IN_SUB_AND_FETCH_N: | |
6256 | case BUILT_IN_OR_AND_FETCH_N: | |
6257 | case BUILT_IN_AND_AND_FETCH_N: | |
6258 | case BUILT_IN_XOR_AND_FETCH_N: | |
6259 | case BUILT_IN_NAND_AND_FETCH_N: | |
6260 | case BUILT_IN_BOOL_COMPARE_AND_SWAP_N: | |
6261 | case BUILT_IN_VAL_COMPARE_AND_SWAP_N: | |
6262 | case BUILT_IN_LOCK_TEST_AND_SET_N: | |
6263 | case BUILT_IN_LOCK_RELEASE_N: | |
6264 | { | |
6265 | int n = sync_resolve_size (function, params); | |
6266 | tree new_function, result; | |
6267 | ||
6268 | if (n == 0) | |
6269 | return error_mark_node; | |
6270 | ||
6271 | new_function = built_in_decls[orig_code + exact_log2 (n) + 1]; | |
6272 | if (!sync_resolve_params (function, new_function, params)) | |
6273 | return error_mark_node; | |
6274 | ||
6275 | result = build_function_call (new_function, params); | |
6276 | if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N | |
6277 | && orig_code != BUILT_IN_LOCK_RELEASE_N) | |
6278 | result = sync_resolve_return (params, result); | |
6279 | ||
6280 | return result; | |
6281 | } | |
6282 | ||
6283 | default: | |
58646b77 | 6284 | return NULL_TREE; |
48ae6c13 RH |
6285 | } |
6286 | } | |
6287 | ||
5bed876a AH |
6288 | /* Ignoring their sign, return true if two scalar types are the same. */ |
6289 | bool | |
6290 | same_scalar_type_ignoring_signedness (tree t1, tree t2) | |
6291 | { | |
6292 | enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2); | |
6293 | ||
6294 | gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE) | |
6295 | && (c2 == INTEGER_TYPE || c2 == REAL_TYPE)); | |
6296 | ||
6297 | /* Equality works here because c_common_signed_type uses | |
6298 | TYPE_MAIN_VARIANT. */ | |
6299 | return lang_hooks.types.signed_type (t1) | |
6300 | == lang_hooks.types.signed_type (t2); | |
6301 | } | |
6302 | ||
104f8784 KG |
6303 | /* Check for missing format attributes on function pointers. LTYPE is |
6304 | the new type or left-hand side type. RTYPE is the old type or | |
6305 | right-hand side type. Returns TRUE if LTYPE is missing the desired | |
6306 | attribute. */ | |
6307 | ||
6308 | bool | |
6309 | check_missing_format_attribute (tree ltype, tree rtype) | |
6310 | { | |
6311 | tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype); | |
6312 | tree ra; | |
6313 | ||
6314 | for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra)) | |
6315 | if (is_attribute_p ("format", TREE_PURPOSE (ra))) | |
6316 | break; | |
6317 | if (ra) | |
6318 | { | |
6319 | tree la; | |
6320 | for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la)) | |
6321 | if (is_attribute_p ("format", TREE_PURPOSE (la))) | |
6322 | break; | |
6323 | return !la; | |
6324 | } | |
6325 | else | |
6326 | return false; | |
6327 | } | |
6328 | ||
ff6b6641 GDR |
6329 | /* Subscripting with type char is likely to lose on a machine where |
6330 | chars are signed. So warn on any machine, but optionally. Don't | |
6331 | warn for unsigned char since that type is safe. Don't warn for | |
6332 | signed char because anyone who uses that must have done so | |
6333 | deliberately. Furthermore, we reduce the false positive load by | |
6334 | warning only for non-constant value of type char. */ | |
6335 | ||
6336 | void | |
6337 | warn_array_subscript_with_type_char (tree index) | |
6338 | { | |
6339 | if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node | |
6340 | && TREE_CODE (index) != INTEGER_CST) | |
6341 | warning (OPT_Wchar_subscripts, "array subscript has type %<char%>"); | |
6342 | } | |
6343 | ||
6344 | ||
e2500fed | 6345 | #include "gt-c-common.h" |